U.S. patent application number 17/241854 was filed with the patent office on 2021-09-02 for method, terminal, and base station for use in data transmission.
The applicant listed for this patent is GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.. Invention is credited to Hai TANG.
Application Number | 20210270142 17/241854 |
Document ID | / |
Family ID | 1000005570071 |
Filed Date | 2021-09-02 |
United States Patent
Application |
20210270142 |
Kind Code |
A1 |
TANG; Hai |
September 2, 2021 |
METHOD, TERMINAL, AND BASE STATION FOR USE IN DATA TRANSMISSION
Abstract
Disclosed are a method, a terminal, and a base station for use
in data transmission. The present invention allows the terminal to
receive a downlink control signaling at a low frequency band and to
transmit data at a high frequency band when high-speed data
transmission is required. The method comprises: when there is no
data transmission, the terminal receives first indication
information in a first cell using a first frequency band, the first
indication information being used for indicating a terminal having
received the first indication information to use a second frequency
band for data transmission; the terminal transmits data in a second
cell using the second frequency band on the basis of the first
indication information when data transmission is required.
Inventors: |
TANG; Hai; (Guangdong,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD. |
Dongguan |
|
CN |
|
|
Family ID: |
1000005570071 |
Appl. No.: |
17/241854 |
Filed: |
April 27, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16098581 |
Nov 2, 2018 |
11026194 |
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PCT/CN2016/085439 |
Jun 12, 2016 |
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17241854 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F01D 11/025 20130101;
F01D 11/02 20130101; F16J 15/342 20130101; F01D 11/003 20130101;
F02C 7/28 20130101; F16J 15/164 20130101; F16J 15/4476
20130101 |
International
Class: |
F01D 11/02 20060101
F01D011/02; F02C 7/28 20060101 F02C007/28; F01D 11/00 20060101
F01D011/00; F16J 15/34 20060101 F16J015/34; F16J 15/447 20060101
F16J015/447; F16J 15/16 20060101 F16J015/16 |
Claims
1. A terminal, comprising: a transceiver, configured to, when no
data is to be transmitted or received, receive first indication
information in a first cell using a first frequency band, the first
indication information being configured to instruct a terminal
receiving the first indication information to perform data
transmission using a second frequency band when there is data to be
transmitted or received, wherein the transceiver is further
configured to, when there is data to be transmitted or received,
perform data transmission in a second cell using the second
frequency band according to the first indication information.
2. The terminal of claim 1, further comprising: a processor,
configured to determine one or more second cells using the second
frequency band to be a target cell according to the first
indication information; and the processor is configured to perform
synchronization with the target cell, wherein the transceiver is
configured to, when there is data to be transmitted or received,
perform data transmission with the target cell using the second
frequency band.
3. The terminal of claim 2, wherein the first indication
information is paging information transmitted by a first base
station through the first cell, or the first indication information
is the paging information and configuration information of the
target cell, the first indication information comprises at least
one of the following information: information of a second frequency
band, information of a base station containing the target cell, or
information of the target cell, the first base station is a base
station containing the first cell, and the processor is configured
to determine the target cell according to the paging information;
or, the processor is configured to determine the target cell
according to the paging information and the configuration
information of the target cell.
4. The terminal of claim 2, wherein the first indication
information is system information of the second cell transmitted by
the first base station through the first cell, the system
information of the second cell comprises at least one of the
following information: information of a frequency band of the
second cell, information of a base station containing the second
cell, or information of a second cell, and the first base station
is a base station containing the first cell, and the transceiver is
configured to receive system information of at least one second
cell, in the first cell using the first frequency band, the system
information of the at least one second cell corresponding to the at
least one second cell; and the processor is configured to determine
one or more second cells from the at least one second cell to be
the target cell according to the system information of the at least
one second cell.
5. The terminal of claim 2, wherein the transceiver is further
configured to transmit an uplink synchronization message to the
target cell belonging to a target base station on the second
frequency band, the uplink synchronization message being configured
to obtain uplink synchronization information between the terminal
and the target cell; the transceiver is further configured to
receive the uplink synchronization information in the first cell,
the uplink synchronization information being acquired by the first
base station from the target base station, the uplink
synchronization information being determined by the target base
station on the basis of the uplink synchronization message, and the
first base station being the base station containing the first
cell; and the processor is configured to perform uplink
synchronization with the target cell according to the uplink
synchronization information.
6. The terminal of claim 5, wherein uplink synchronization
information and a transmitting resource are determined by the
target base station and transmitted to the terminal through the
first base station; or the uplink synchronization information is
requested by the first base station from the target base station,
and transmitted to the terminal by the first base station after the
target base station obtains the uplink synchronization information
and allocates the transmitting resource, wherein the uplink
synchronization information comprises indication information of the
transmitting resource.
7. The terminal of claim 2, wherein the transceiver is further
configured to receive downlink synchronization information of the
first cell in the first cell; the processor is further configured
to determine downlink synchronization information of the target
cell; and the processor is configured to perform downlink
synchronization with the target cell according to the downlink
synchronization information of the target cell.
8. The terminal of claim 7, wherein the transceiver is further
configured to receive at least one downlink synchronization offset
information transmitted by the first base station through the first
cell and corresponding to the at least one second cell, each
downlink synchronization offset information comprising a time
offset between timing of the corresponding second cell and timing
of the first cell, and the first base station being the base
station containing the first cell; and the processor is configured
to determine the downlink synchronization information of the target
cell according to the downlink synchronization offset information
of the at least one second cell.
9. A base station, comprising: a processor, configured to determine
first indication information, the first indication information
being configured to indicate a terminal receiving the first
indication information to transmit data in a second cell using a
second frequency band, and the base station being a base station
containing a first cell using a first frequency band; and a
transceiver, configured to transmit the first indication
information through the first cell.
10. The base station of claim 9, wherein the first indication
information is paging information, or the first indication
information is the paging information and configuration information
of a target cell, the first indication information comprises at
least one of the following information: information of a second
frequency band, information of a target base station, or
information of the target cell, the second cell comprises the
target cell, and the target base station is a base station
containing the target cell, and the transceiver is configured to
transmit the paging information through the first cell; or, the
transceiver is configured to transmit the paging information and
the configuration information of the target cell through the first
cell.
11. The base station of claim 9, wherein the first indication
information is system information of the second cell, the system
information of the second cell comprises at least one of the
following information: information of a frequency band of the
second cell, information of a base station containing the second
cell, or information of the second cell, and the transceiver is
further configured to receive system information of at least one
second cell from at least one second base station, the system
information of the at least one second cell corresponding to the at
least one second cell; and the transceiver is configured to
transmit the system information of the at least one second cell
through the first cell.
12. The base station of claim 9, wherein the transceiver is further
configured to transmit uplink synchronization information through
the first cell, the uplink synchronization information being
acquired by the first base station from the target base station,
and the uplink synchronization information being determined by the
target base station on the basis of an uplink synchronization
message transmitted by the terminal to the target base station on
the second frequency band, wherein the target base station is a
base station containing the target cell, and the target cell is
determined by the terminal from the at least one second cell.
13. The base station of claim 9, wherein the transceiver is further
configured to transmit downlink synchronization information of the
first cell to the terminal through the first cell.
14. The base station of claim 13, wherein the transceiver is
further configured to transmit at least one downlink
synchronization offset information corresponding to the at least
one second cell to the terminal through the first cell, each
downlink synchronization offset information comprising a time
offset between timing of the corresponding second cell and timing
of the first cell.
15. A base station, comprising: a transceiver, configured to
transmit system information of a second cell to a first base
station, the system information being configured to indicate a
system parameter of the second cell, a carrier frequency
corresponding to the second cell belonging to a second frequency
band, the first base station being a base station to which a first
cell using a first frequency band belongs and the second base
station pre-storing a mapping relationship between the second cell
and the first cell, wherein the transceiver is further configured
to transmit data with a terminal through the second cell.
16. The base station of claim 15, wherein the transceiver is
further configured to receive an uplink synchronization request
from the terminal on the second frequency band, the uplink
synchronization request being configured to obtain uplink
synchronization information between the terminal and the second
cell; and the transceiver is further configured to determine the
uplink synchronization information according to the uplink
synchronization request and transmit the uplink synchronization
information to the first base station.
Description
TECHNICAL FIELD
[0001] The disclosure relates to the field of communications, and
more particularly to a data transmission method, a terminal and a
base station.
BACKGROUND
[0002] Along with constant increase of requirements on data
transmission rate, communication quality and the like of mobile
communication, high-frequency-band broadband is introduced into
wireless communication. A terminal may receive downlink control
signaling such as system information or paging information through
a low-frequency-band narrow-band cell and perform high-speed data
transmission through a high-frequency-band broadband cell.
[0003] At present, there is such a known technology that, for
solving the problem of relatively high received power consumption
caused by the fact that a terminal in an idle state receives
downlink signaling through a high-frequency-band broadband link,
the terminal may reside in a low-frequency-band narrow-band cell,
enter the idle state and receive system information and paging
information in a low band. When the terminal has uplink data to be
transmitted, the terminal may access a high-frequency-band
broadband cell for high-speed data transmission.
[0004] However, a terminal has to perform a cell access process
before the terminal can perform high-speed data transmission
through a high-frequency-band broadband cell. Therefore, the
process for initiating high-speed data transmission takes a
relatively long time and has a relatively high signaling
overhead.
SUMMARY
[0005] The disclosure provides a data transmission method and
device, to enable a terminal to keep synchronized with both a
low-frequency-band cell and a high-frequency-band cell, receive
downlink control signaling transmitted by the low-frequency-band
cell and, when high-speed data transmission is required, access the
high-frequency-band cell as fast as possible or perform data
transmission with the high-frequency-band cell, thereby reducing
process and signaling overhead of a high-speed data service.
[0006] According to a first aspect, the disclosure provides a data
transmission method, which may include that, when no data is to be
transmitted or received, a terminal receives first indication
information in a first cell using a first frequency band, the first
indication information being configured to instruct the terminal
receiving the first indication information to perform data
transmission using a second frequency band when there is data to be
transmitted or received; and when there is data to be transmitted
or received, the terminal performs data transmission in a second
cell using the second frequency band according to the first
indication information.
[0007] When the terminal is in an idle state, or context of the
terminal is still maintained at a previous serving base station but
mobility management of the terminal may be implemented under a cell
selection or cell reselection rule, it may be understood that the
terminal is in a no-data-transmission state. In other words,
mobility of the terminal is not directly controlled by a
network.
[0008] The terminal completes synchronization with a target cell in
advance on the first frequency band and, when there is data to be
transmitted or received, performs data transmission with the target
cell, so that relatively high power consumption probably brought by
reception of downlink control signaling by the terminal camping on
a high frequency band is avoided. Meanwhile, synchronization with
the target cell is completed in advance to make it possible to
implement data transmission with the target cell when there is data
to be transmitted or received. Compared with the prior art, the
method greatly reduces cell access process in the prior art and
reduces a signaling overhead.
[0009] In combination with the first aspect, in a first possible
implementation mode of the first aspect, the operation that the
terminal performs data transmission in the second cell using the
second frequency band according to the first indication information
when there is data to be transmitted or received may include that,
the terminal determines one or more second cells using the second
frequency band as (a) target cell(s) according to the first
indication information; the terminal performs cell synchronization
with the target cell(s); and when there is data to be transmitted
or received, the terminal uses the second frequency band for data
transmission with the target cell(s).
[0010] The terminal determines the one or more second cells to be
the target cell(s) according to the cell selection or cell
reselection rule and performs data transmission with the target
cell(s).
[0011] In combination with the first aspect or the abovementioned
possible implementation mode thereof, in a second possible
implementation mode of the first aspect, the first indication
information may be paging information transmitted by a first base
station through the first cell, or the first indication information
may be the paging information and configuration information of the
target cell(s), the first indication information may include
information of a second frequency band and/or information of a base
station containing the target cell(s) and/or information of the
target cell, the first base station may be a base station
containing the first cell. The operation that the terminal
determines the one or more second cells using the second frequency
band to be the target cell(s) according to the first indication
information may include that, the terminal determines the target
cell(s) according to the paging information; or the terminal
determines the target cell(s) according to the paging information
and the configuration information of the target cell(s).
[0012] When there is downlink data to be transmitted, the first
base station may indicate the information of the second frequency
band and/or information of the base station containing the target
cell(s) and/or information of the target cell for data transmission
required by the terminal through the paging information. Or, the
first base station may also indicate the information of the second
frequency band and/or information of the base station containing
the target cell(s) and/or information of the target cell for data
transmission required by the terminal through the paging
information and the configuration information of the target
cell(s). Therefore, the terminal may look for the target cell(s) in
a smaller range and the efficiency of determining the target cell
may be improved.
[0013] In combination with the first aspect or the abovementioned
possible implementation modes thereof, in a third possible
implementation mode of the first aspect, the first indication
information may be system information of the second cell
transmitted by the first base station through the first cell, the
system information of the second cell may include information of
the frequency band of the second cell and/or information of the
base station (i.e., second base station) containing the second cell
and/or information of the second cell, the first base station may
be the base station containing the first cell. The operation that
the terminal receives the first indication information in the first
cell using the first frequency band when no data is to be
transmitted or received may include that, the terminal receives
system information of at least one second cell in the first cell
using the first frequency band, the system information of the at
least one second cell corresponding to the at least one second
cell. The operation that the terminal determines the one or more
second cells using the second frequency band to be the target
cell(s) according to the first indication information may include
that, the terminal determines one or more second cells from the at
least one second cell to be the target cell(s) according to the
system information of the at least one second cell.
[0014] When there is uplink data to be transmitted, the terminal
may determine the target cell(s) for uplink data transmission
through the information of the frequency band of the second cell
and/or information of the base station containing the second cell
and/or information of the second cell indicated by the system
information and under the cell selection or cell reselection
rule.
[0015] In combination with the first aspect or the abovementioned
possible implementation modes thereof, in a fourth possible
implementation mode of the first aspect, the operation that the
terminal performs cell synchronization with the target cell(s) may
include that, the terminal transmits an uplink synchronization
request to a target base station containing the target cell(s) on
the second frequency band, the uplink synchronization request is
configured to obtain uplink synchronization information of the
terminal and the target cell(s); the terminal receives the uplink
synchronization information in the first cell, the uplink
synchronization information is acquired by the first base station
from the target base station, the uplink synchronization
information is determined by the target base station on the basis
of the uplink synchronization request and the first base station is
the base station containing the first cell; and the terminal
performs uplink synchronization with the target cell(s) according
to the uplink synchronization information.
[0016] The terminal may transmit the uplink synchronization request
on the second frequency band indicated by the first indication
information to acquire the uplink synchronization information
between the target cell(s) and the terminal and perform uplink
synchronization with the target cell(s).
[0017] In combination with the first aspect or the abovementioned
possible implementation modes thereof, in a fifth possible
implementation mode of the first aspect, the operation that the
terminal performs cell synchronization with the target cell(s) may
include that, the terminal receives downlink synchronization
information of the first cell in the first cell; the terminal
determines downlink synchronization information of the target
cell(s); and the terminal performs downlink synchronization with
the target cell(s) according to the downlink synchronization
information of the target cell(s).
[0018] In combination with the first aspect or the abovementioned
possible implementation modes thereof, in a sixth possible
implementation mode of the first aspect, the operation that the
terminal determines the downlink synchronization information of the
target cell(s) may include that, the terminal receives at least one
downlink synchronization offset information transmitted by the
first base station through the first cell and corresponding to the
at least one second cell, each downlink synchronization offset
information including a time offset between timing of the
corresponding second cell and timing of the first cell and the
first base station being the base station containing the first
cell; and the terminal determines the downlink synchronization
information of the target cell(s) according to the downlink
synchronization offset information of the at least one second
cell.
[0019] The terminal may acquire the downlink synchronization
information of the first cell and the downlink synchronization
information of the target cell(s) from the first base station for
downlink synchronization with the target cell(s).
[0020] According to a second aspect, the disclosure provides a data
transmission method, which may include that, a first base station
determines first indication information. The first indication
information is configured to instruct a terminal receiving the
first indication information to transmit data in a second cell
using a second frequency band, and the first base station is a base
station to which a first cell using a first frequency band belongs;
and the first base station transmits the first indication
information through the first cell.
[0021] The terminal completes synchronization with a target cell in
advance on the first frequency band and, when there is data to be
transmitted or received, performs data transmission with the target
cell, so that relatively high power consumption probably brought by
reception of downlink control signaling by the terminal camping on
a high frequency band is avoided. Meanwhile, synchronization with
the target cell is completed in advance to make it possible to
implement data transmission with the target cell when there is data
to be transmitted or received. Compared with the prior art, the
method greatly reduces cell access process in the prior art and
reduces a signaling overhead.
[0022] In combination with the second aspect, in a first possible
implementation mode of the second aspect, the first indication
information may be paging information, or the first indication
information may be the paging information and configuration
information of a target cell, the first indication information may
include information of a second frequency band and/or information
of a target base station and/or information of the target cell, the
second cell may include the target cell, a target base station may
be a base station containing the target cell, and the operation
that the first base station transmits the first indication
information through the first cell may include that, the first base
station transmits the paging information through the first cell; or
the first base station transmits the paging information and the
configuration information of the target cell through the first
cell.
[0023] When there is downlink data to be transmitted, the first
base station may indicate the information of the second frequency
band and/or information of the target base station and/or
information of the target cell for data transmission required by
the terminal through the paging information.
[0024] In combination with the second aspect or the abovementioned
implementation mode thereof, in a second possible implementation
mode of the second aspect, the first indication information may be
system information of the second cell, the system information of
the second cell may include the information of the frequency band
of the second cell and/or information of the base station
containing the second cell and/or information of the second cell,
and the operation that the first base station transmits the first
indication information through the first cell may include that, the
first base station receives system information of at least one
second cell transmitted by at least one second base station, the
system information of the at least one second cell corresponds to
the at least one second cell; and the first base station transmits
the system information of the at least one second cell through the
first cell.
[0025] When there is uplink data to be transmitted, the terminal
may determine the target cell for uplink data transmission through
the information of the second frequency band and/or information of
the second base station and/or information of the second cell
indicated by the system information and through a cell selection or
cell reselection rule.
[0026] In combination with the second aspect or the abovementioned
implementation modes thereof, in a third possible implementation
mode of the second aspect, the method may further include that, the
first base station transmits uplink synchronization information
through the first cell, the uplink synchronization information is
acquired by the first base station from the target base station and
the uplink synchronization information is determined by the target
base station on the basis of an uplink synchronization request
transmitted by the terminal to the target base station on the
second frequency band, the target base station may be the base
station containing the target cell, and the target cell may be
determined by the terminal from the at least one second cell.
[0027] The terminal may transmit the uplink synchronization request
on the second frequency band indicated by the first indication
information to acquire the uplink synchronization information
between the target cell and the terminal and perform uplink
synchronization with the target cell.
[0028] In combination with the second aspect or the abovementioned
implementation modes thereof, in a fourth possible implementation
mode of the second aspect, the method may further include that, the
first base station transmits downlink synchronization information
of the first cell to the terminal through the first cell.
[0029] In combination with the second aspect or the abovementioned
implementation modes thereof, in a fifth possible implementation
mode of the second aspect, the method may further include that, the
first base station transmits at least one downlink synchronization
offset information corresponding to the at least one second cell to
the terminal through the first cell, each downlink synchronization
offset information includes a time offset between timing of the
corresponding second cell and timing of the first cell.
[0030] The terminal may acquire the downlink synchronization
information of the first cell and downlink synchronization
information of the target cell from the first base station for
downlink synchronization with the target cell.
[0031] According to a third aspect, the disclosure provides a data
transmission method, which may include that, a second base station
transmits system information of a second cell to a first base
station, the system information is configured to indicate a system
parameter of the second cell, a carrier frequency corresponding to
the second cell belongs to a second frequency band, the first base
station is a base station containing a first cell using a first
frequency band and the second base station pre-stores a mapping
relationship between the second cell and the first cell; and the
second base station transmits data with a terminal through the
second cell.
[0032] In combination with the third aspect, in a first possible
implementation mode of the third aspect, the method may further
include that, the second base station receives an uplink
synchronization request transmitted by the terminal on the second
frequency band, the uplink synchronization request is configured to
obtain uplink synchronization information of the terminal and the
second cell; and the second base station determines the uplink
synchronization information according to the uplink synchronization
request, and transmits the uplink synchronization information to
the first base station.
[0033] The second base station may transmit the uplink
synchronization information to the terminal through the uplink
synchronization request received from the terminal on the second
frequency band to facilitate uplink synchronization between the
second base station and the terminal.
[0034] According to a fourth aspect, the disclosure provides a
terminal, which is configured to execute the method in the first
aspect or any possible implementation mode of the first aspect.
Specifically, the terminal includes units configured to execute the
method in the first aspect or any possible implementation mode of
the first aspect.
[0035] According to a fifth aspect, the disclosure provides a base
station, which is configured to execute the method in the second
aspect or any possible implementation mode of the second aspect.
Specifically, the base station includes units configured to execute
the method in the second aspect or any possible implementation mode
of the second aspect.
[0036] According to a sixth aspect, the disclosure provides another
base station, which is configured to execute the method in the
third aspect or any possible implementation mode of the third
aspect. Specifically, the base station includes units configured to
execute the method in the third aspect or any possible
implementation mode of the third aspect.
[0037] According to a seventh aspect, the disclosure provides a
terminal, which includes a transceiver, a processor, a memory and a
bus system, the transceiver, the memory and the processor are
connected through the bus system, the memory is configured to store
instructions, the processor is configured to execute the
instructions stored in the memory to control the transceiver to
transmit and receive signals, and when the processor executes the
instructions stored in the memory, such execution enables the
processor to execute the method in the first aspect or any possible
implementation mode of the first aspect.
[0038] According to an eighth aspect, the disclosure provides a
base station, which includes a transceiver, a memory, a processor
and a bus system, the transceiver, the memory and the processor are
connected through the bus system, the memory is configured to store
instructions, the processor is configured to execute the
instruction stored in the memory to control the transceiver to
transmit and receive signals, and when the processor executes the
instructions stored in the memory, such execution enables the
processor to execute the method in the second aspect or any
possible implementation mode of the second aspect.
[0039] According to a ninth aspect, the disclosure provides another
base station, which includes a transceiver, a memory, a processor
and a bus system, the transceiver, the memory and the processor are
connected through the bus system, the memory is configured to store
instructions, the processor is configured to execute the
instructions stored in the memory to control the transceiver to
transmit and receive signals, and when the processor executes the
instructions stored in the memory, such execution enables the
processor to execute the method in the third aspect or any possible
implementation mode of the third aspect.
[0040] According to a tenth aspect, the disclosure provides a
computer-readable medium, which is configured to store a computer
program, the computer program including instructions configured to
execute the method in the first aspect or any possible
implementation mode of the first aspect.
[0041] According to an eleventh aspect, the disclosure provides a
computer-readable medium, which is configured to store a computer
program, the computer program including an instruction configured
to execute the method in the second aspect or any possible
implementation mode of the second aspect.
[0042] According to a twelfth aspect, the disclosure provides a
computer-readable medium, which is configured to store a computer
program, the computer program including instructions configured to
execute the method in the third aspect or any possible
implementation mode of the third aspect.
[0043] In some implementation modes, the paging information
includes the second frequency band information and/or the
corresponding base station (i.e., target base station) information
of the target cell and/or the target cell information, and the
first base station is the base station containing the first
cell.
[0044] In some implementation modes, the second frequency band
information includes at least one of frequency band information, a
bandwidth, a threshold value or an offset. The corresponding base
station information of the target cell includes a target base
station Identifier (ID). The target cell information includes at
least one of a cell ID or a cell access technology.
[0045] In some implementation modes, the system information of the
second cell includes the frequency band information of the second
cell and/or the corresponding base station information of the
second cell and/or the second cell information.
[0046] In some implementation modes, the second frequency band
information includes at least one of the frequency band
information, the bandwidth, the threshold value or the offset. The
corresponding base station information of the second cell includes
a second base station ID. The second cell information includes at
least one of a cell ID or a cell access technology.
[0047] In some implementation modes, the uplink synchronization
request and a transmitting resource are determined by the target
base station and transmitted to the terminal through the first base
station. Or, uplink synchronization request information is
transmitted to the terminal by the first base station after the
first base station requests the target base station and the target
base station acknowledges the uplink synchronization request and
allocates the transmitting resource. The uplink synchronization
request information includes indication information of the
transmitting resource.
[0048] According to the data transmission method, terminal and base
station provided in the disclosure, the terminal may receive
downlink control signaling on a low frequency band and, when
high-speed data transmission is required, access a
high-frequency-band cell as fast as possible or perform data
transmission with the high-frequency-band cell, thereby reducing
process and signaling overhead of a high-speed data service.
BRIEF DESCRIPTION OF DRAWINGS
[0049] In order to describe the technical solutions of the
embodiments of the disclosure more clearly, the drawings required
to be used in the embodiments of the disclosure will be simply
introduced below. It is apparent that the drawings described below
are only some embodiments of the disclosure. Other drawings may
further be obtained by those of ordinary skill in the art according
to these drawings without creative work.
[0050] FIG. 1 illustrates a schematic diagram of an application
scenario according to an embodiment of the disclosure.
[0051] FIG. 2 illustrates a schematic flowchart of a data
transmission method according to an embodiment of the
disclosure.
[0052] FIG. 3 illustrates a schematic block diagram of a terminal
according to an embodiment of the application.
[0053] FIG. 4 illustrates a schematic block diagram of a base
station according to an embodiment of the application.
[0054] FIG. 5 illustrates a schematic block diagram of another base
station according to another embodiment of the application.
[0055] FIG. 6 illustrates another schematic block diagram of a
terminal according to an embodiment of the application.
[0056] FIG. 7 illustrates another schematic block diagram of a base
station according to an embodiment of the application.
[0057] FIG. 8 illustrates another schematic block diagram of
another base station according to an embodiment of the
application.
DETAILED DESCRIPTION
[0058] The technical solutions in the embodiments of the disclosure
will be clearly and completely described below in combination with
the drawings in the embodiments of the disclosure. It is apparent
that the described embodiments are not all embodiments but part of
embodiments of the disclosure. All other embodiments obtained by
those of ordinary skill in the art on the basis of the embodiments
in the disclosure without creative work shall fall within the scope
of protection of the disclosure.
[0059] It is to be understood that the technical solutions of the
disclosure may be applied to various communication systems, for
example, a Global System of Mobile Communication (GSM), a Code
Division Multiple Access (CDMA) system, a Wideband Code Division
Multiple Access (WCDMA) system, a General Packet Radio Service
(GPRS), a Long Term Evolution (LTE) system, an Advanced Long Term
Evolution (LTE-A) system and a Universal Mobile Telecommunication
System (UMTS).
[0060] It is also to be understood that, in the embodiments of the
disclosure, User Device (UE includes, but not limited to, a Mobile
Station (MS), a mobile terminal, a mobile telephone, a handset, a
fixed station, a fixed terminal, portable device and the like. The
UE may communicate with one or more core networks through a Radio
Access Network (RAN). For example, the UE may be a mobile telephone
(or called a "cell" phone), a computer with a wireless
communication function and the like. The UE may also be a portable,
pocket, handheld, computer-embedded, instrument-embedded or
vehicle-mounted device.
[0061] FIG. 1 illustrates a schematic diagram of an application
scenario according to an embodiment of the disclosure. FIG. 1
illustrates a high/low-frequency hybrid networking system, which
includes a low-frequency base station 11, at least one
high-frequency base station 12 and a terminal 13.
[0062] In the embodiment of the disclosure, a frequency band of the
low-frequency base station 11 is lower than a frequency band of the
high-frequency base station 12. The frequency band adopted for the
low-frequency base station 11 may be a low frequency band below 6
GHz, for example, 2 GHz and 5 GHz. The frequency band adopted for
the high-frequency base station 12 may be a millimeter frequency
band (namely above 6 GHz) as a representative of a high frequency
band. For example, the frequency used for the high-frequency base
station 12 may be 72 GHz, 28 GHz or 14 GHz.
[0063] The low-frequency base station 11 covers a relatively large
region. The high-frequency base station 12 implements hot spot
coverage within the coverage of the low-frequency base station, to
improve capacity of a hot region. The terminal 13 is usually
configured with both a low-frequency transceiver and a
high-frequency transceiver. The low-frequency transceiver is
configured for data communication with the low-frequency base
station 11. The high-frequency transceiver is configured for data
communication with the high-frequency base station 12.
[0064] The terminal 13 may camp in a low-frequency cell and receive
downlink control signaling from the low-frequency base station 11.
The downlink control signaling may include downlink control
signaling, for example, system information and paging information,
of the low-frequency cell and a high-frequency cell. Meanwhile, the
terminal may transmit data with the high-frequency base station 12
on the basis of the system information and paging information of
the high-frequency cell received from the low-frequency base
station 11.
[0065] It is to be understood that the terms "low frequency" and
"high frequency" are only adopted to distinguish different
frequency bands to which carrier frequencies corresponding to the
cells belong. The carrier frequency of the low-frequency cell
belongs to a low frequency band and the carrier frequency
corresponding to the high-frequency cell belongs to a high
frequency band. The low-frequency base station is a base station of
the low-frequency cell and the high-frequency base station is a
base station of the high-frequency cell. That is, for the base
stations, a difference between low frequency and high frequency
lies in that carriers used by the base stations are located on
different frequency bands. Therefore, the low-frequency base
station and the high-frequency base station may be the same base
station which uses the carrier frequency of the low frequency band
for data transmission and reception in the low-frequency cell and
uses the carrier frequency of the high frequency band for data
transmission and reception in the high-frequency cell. Or, the
low-frequency base station and the high-frequency base station may
be different base stations, the low-frequency base station uses the
carrier frequency of the low frequency band for data transmission
and reception and the high-frequency base station uses the carrier
frequency of the high frequency band for data transmission and
reception. There are no special limits made thereto in the
disclosure.
[0066] In the embodiment of the disclosure, for convenience of
distinction and description, the low-frequency base station may be
denoted as a first base station, the low-frequency cell is denoted
as a first cell, the high-frequency base station is denoted as a
second base station and the high-frequency cell is denoted as a
second cell. At least one second cell may be configured within the
coverage of the first base station of the first cell. Each cell may
correspond to a serving base station. Or, multiple second cells may
share the same serving base station (i.e., the second base
station).
[0067] It is to be understood that "first" and "second" are adopted
only to distinguish low frequency and high frequency and should not
form any limit to the disclosure. For example, the high-frequency
base station may be denoted as the first base station, the
high-frequency cell may be denoted as the first cell, the
low-frequency base station may be denoted as the second base
station and the low-frequency cell may be denoted as the second
cell. It is also to be understood'that the first base station and
the second base station may be different base stations or may be
the same base station.
[0068] In the embodiment of the disclosure, the terminal, after
determining to transmit data on a second frequency band, may
receive system information transmitted by each of the at least one
second cell on the second frequency band. The terminal determines a
cell for data transmission with the terminal from the at least one
second cell according to a cell selection or cell reselection rule.
For convenience of distinction and description, the cell determined
by the terminal is denoted as a target cell and a serving cell of
the target cell is denoted as a target base station. It is to be
understood that both the target base station and the second base
station may be high-frequency base stations and the terms "target
base station" and "second base station" are only adopted to
distinguish whether they are base stations configured for data
transmission with the terminal. The target base station is
relative. For example, for a terminal A, a base station A may be a
target base station; and for a terminal B, a base station B may be
a target base station.
[0069] It is to be understood that the target cell may share the
same serving base station with another cell in the at least one
second cell. The target cell may also share the same serving base
station (i.e., the first base station) with the first cell. The
target base station may also be the serving base station of the
target cell only. There are no special limits made to a mapping
relationship between a base station and a cell in the
disclosure.
[0070] It is also to be understood that, in the following
embodiments of the disclosure, the first base station is a base
station containing the first cell, the second base station is a
base station to which the second cell belongs and the target base
station is a base station containing the target cell. However, the
first base station, the second base station and the target base
station are not limited and they may also be base stations
containing other cells. In the embodiment of the disclosure,
exemplary descriptions will be made only with the condition that
the first base station transmits information through the first
cell, the second base station transmits information through the
second cell and the target base station transmits information
through the target cell as an example and should not form any limit
to the disclosure. For example, the first base station may also
transmit information through another cell. There are no special
limits made thereto in the disclosure.
[0071] For convenience of understanding and description, a data
transmission method according to the embodiments of the disclosure
will be described below in combination with FIG. 2 in detail with
the condition that the first base station and the second base
station are different base stations as an example. It is to be
understood that the condition that the first base station and the
second base station are different base stations is only for
exemplary descriptions and should not form any limit to the
disclosure. When the first base station and the second base station
are the same base station, data transmission between the terminal
and the high-frequency base station may still be implemented by
executing the method 200.
[0072] FIG. 2 illustrates a schematic flowchart of a data
transmission method 200 according to an embodiment of the
disclosure. It is to be understood that FIG. 2 illustrates detailed
communication actions or operations of the data transmission method
described from the view of interaction among a terminal, a
low-frequency base station (for example, a first base station) and
a high-frequency base station (for example, a target base station)
according to an embodiment of the disclosure. However, these
actions or operations are only examples and other operations or
transformations of various operations in FIG. 2 may also be
executed in the embodiment of the disclosure. In addition, each
action in FIG. 2 may be executed in a sequence different from that
presented in FIG. 2 and not all the operations in FIG. 2 may be
executed.
[0073] It is to be understood that the schematic flowchart of
interaction among the terminal, the first base station and the
second base station in FIG. 2 is only exemplarily described and
should not form any limit to the disclosure. In the embodiment of
the disclosure, the first base station (i.e., an example of the
low-frequency base station) may form a mapping relationship with at
least one high-frequency base station (for example, including a
second base station). That is, the terminal camping in the
low-frequency cell may transmit data with the at least one
high-frequency base station.
[0074] As illustrated in FIG. 2, the method 200 includes the
following actions.
[0075] In S202, when no data is to be transmitted or received, a
terminal receives first indication information in a first cell
using a first frequency band.
[0076] Specifically, when a terminal is in an idle state, or when
context of the terminal is still maintained at a previous serving
base station but the terminal may perform mobility management under
a cell selection or cell reselection rule, it may be understood
that the terminal is in a no-data-transmission state. In other
words, mobility of the terminal is not directly controlled by a
network.
[0077] Here, the previous serving base station may be the first
base station in the embodiment of the disclosure or may be another
base station. There are no special limits made thereto in the
disclosure.
[0078] It is to be noted that the first cell does not specifically
mean a specific cell and the first cell may be a certain cell in a
type of cells transmitting the first indication information.
[0079] Specifically, a zone to be covered is divided into a
plurality of regions, an access point is set in each region to
serve users in the region, and the region is a cell. The definition
of the cell may follow the existing concept of the cell, or may be
one or more adjacent beams in beam forming, or may be a carrier in
the region.
[0080] In the embodiment of the disclosure, the first base station
transmits the first indication information through the first cell
(or on the first frequency band). The first indication information
instructs the terminal to transmit data on a second frequency band.
The terminal receiving the first indication information may
transmit data in the second cell using the second frequency band
according to the first indication information.
[0081] It is to be noted that the second cell does not specifically
mean a specific cell. Instead, the second cell may be a certain
cell in cells using the second frequency band indicated by the
first indication information, or may be a cell indicated by the
first indication information. Specifically, the cell may be an
existing cell, or may be one or more adjacent beams in beam
forming, or may be a carrier in the region.
[0082] It is to be understood that "first" and "second" are adopted
only for distinction and should not form any limit to the
disclosure. It is also to be understood that the first base station
is a base station containing the first cell, or the first base
station is a serving base station of the first cell. The second
base station is a base station to which the second cell belongs, or
the second base station is a serving base station of the second
cell. The first base station may correspond to a cell, i.e., the
first cell, and may also be a serving base station of multiple
cells. The second base station may correspond to a cell, i.e., the
second cell, and may also be a serving base station of multiple
cells. There are no special limits made in the disclosure.
[0083] In the embodiment of the disclosure, the first base station
is an example of a low-frequency base station and may cover a
relatively large region. The second base station is an example of a
high-frequency base station and may implement hot spot coverage in
coverage of the first base station. That is, there may be one or
more second cells in the first cell. As a serving base station of
the second cell, a mapping relationship with the low-frequency base
station may be pre-stored in each high-frequency base station. Or,
each high-frequency base station may pre-store the mapping
relationship with the low-frequency base station and coverage of
the high-frequency base station is within the coverage of the
low-frequency base station. Each high-frequency base station may
periodically transmit system information or paging information of
the high-frequency cell served by the high-frequency base station
to the corresponding low-frequency base station according to the
mapping relationship.
[0084] In other words, the second base station within the coverage
of the first base station forms the mapping relationship with the
first base station and each second base station in at least one
second base station within the coverage of the first base station
may transmit the system information or paging information of the
corresponding cell to the first base station through an interface
between the base stations. Specifically, the system information or
paging information of the second cell may be periodically
broadcast, and may be acquired by the first base station from the
second base station through an X2 interface or an interface with a
function as same as or similar to that of the X2 interface.
[0085] For example, a base station A (i.e., an example of the
second base station) within the coverage of the first base station
may transmit system information or paging information of a cell A
(i.e., an example of the second cell) to the first base station
through an interface between the base station A and the first base
station. A base station B (i.e., another example of the second base
station) within the coverage of the first base station may transmit
system information or paging information of a cell B (i.e., another
example of the second cell) to the first base station through an
interface between the base station B and the first base
station.
[0086] It is to be understood that the X2 interface between the
base stations is listed above only for exemplary description, and
should not form any limit to the disclosure. Communication between
the base stations through the interface with the function as same
as or similar to that of the X2 interface should not be excluded in
the disclosure.
[0087] It is also to be understood that the method by which the
second base station transmits the system information or paging
information of the second cell to the first base station through
the interface between the base stations is listed above only as a
possible implementation mode about that the first base station
acquire the system information or the paging system, and should not
form any limit to the disclosure. For example, the first base
station may also pre-configure the system information and paging
information of the second cell for periodic broadcast in the first
cell.
[0088] It is to be noted that the terminal, when being located
within the coverage of the first base station, may receive a
downlink synchronization signal (denoted as a first downlink
synchronization signal for convenience of distinction and
description) of the first base station in the first cell (or on the
first frequency band) for downlink synchronization with the first
cell and, after downlink synchronization with the first cell, camp
in the first cell. In this case, the terminal may receive downlink
control signaling (for example, the system information and the
paging information) broadcast by the first base station. It is to
be understood that a method by which the terminal performs downlink
synchronization with the first cell on the first frequency band is
similar to the prior art and will not be elaborated herein for
simplicity.
[0089] Or, when the first base station is a previous serving base
station of the terminal, context of the terminal is still
maintained at the first base station and the downlink control
signaling transmitted by the first base station may be received on
the first frequency band.
[0090] Without loss of generality, the first base station, after
determining the second frequency band, may transmit the first
indication information in the first cell in a broadcast form, the
first indication information being configured to instruct terminals
(including the abovementioned terminal) within the coverage of the
first cell or the terminal receiving the first indication
information to transmit data with the second cell using the second
frequency band. It is to be understood that there are multiple
terminals in the coverage of the first cell and each terminal,
after receiving the first indication information broadcast by the
first base station through the first cell, may determine a target
cell for respective data transmission and perform cell
synchronization and data transmission with the respective target
cell. The terminal mentioned above does not specifically mean a
specific terminal, and the terminal may be a certain terminal
receiving the first indication information in a type of cells.
[0091] In S204, the terminal determines one or more second cells
using the second frequency band as (a) target cell(s) according to
the first indication information.
[0092] In the embodiment of the disclosure, the at least one second
cell includes the target cell(s) and the system information
includes system information of the target cell(s). If there is only
one second cell in the coverage of the first base station, the
terminal may directly determine the second cell to be the target
cell according to the first indication information and perform data
transmission with the target cell. If there are two or more second
cells in the coverage of the first base station, the terminal may
receive system information transmitted by each second cell in the
at least one second cell on the second frequency band according to
the second frequency band indicated by the first indication
information. The terminal may determine one or more second cells in
the at least one second cell to be the target cell(s) according to
the cell selection or cell reselection rule. A method by which the
terminal determines the target cell(s) according to the cell
selection or cell reselection rule may be implemented through the
prior art. Detailed descriptions about a specific process by which
the terminal determines the target cell(s) are omitted herein for
simplicity.
[0093] It is to be understood that the terminal may select the one
or more second cells to be the target cell(s) on the second
frequency band according to the cell selection or cell reselection
rule. There are no special limits made to the number of the target
cell(s) in the disclosure.
[0094] In the embodiment of the disclosure, the first indication
information broadcast by the first base station may be paging
information. Or, the first indication information broadcast by the
first base station may be the paging information and configuration
information of the target cell(s). Or, the first indication
information may be system information.
[0095] Alternatively, the first indication information is the
paging information transmitted by the first base station through
the first cell, or the first indication information is the paging
information and configuration information of the target cell(s).
The first indication information includes information of a second
frequency band and/or information of a base station (i.e., target
base station) containing the target cell(s) and/or information of
the target cell.
[0096] The information of the second frequency band includes at
least one of frequency band information, bandwidth, a threshold
value or an offset. The information of the base station of which
the target cell includes a target base station ID. The information
of target cell includes at least one of a cell ID or a cell access
technology.
[0097] Alternatively, the operation in S204 that the terminal
determines the one or more second cells using the second frequency
band to be the target cell(s) according to the first indication
information includes one of the following two actions.
[0098] The terminal determines the target cell(s) according to the
paging information.
[0099] The terminal determines the target cell(s) according to the
paging information and the configuration information of the target
cell(s).
[0100] Specifically, a network side, when having downlink data to
be transmitted to the terminal, may transmit a paging message to
notify the terminal. For example, the paging message may directly
be transmitted to the first base station by a core network, and
then the first base station generates the paging information to be
transmitted in the first cell according to the paging message.
Specifically, the first base station may generate the first
indication information according to the paging message, the first
indication information including the information of the second
frequency band and/or information of the base station (i.e., target
base station) containing the target cell(s) and/or information of
the target cell, and the first indication information being
transmitted in the first cell in form of the paging information.
Or, the first base station adds the information of the second
frequency band and/or information of the base station (i.e., target
base station) containing the target cell(s) and/or information of
the target cell into the paging information to be transmitted in
the first cell. The first base station transmits the paging
information in the first cell, to enable the terminal to determine
the target cell(s) when receiving the paging information and
further transmit data with the target cell(s).
[0101] Furthermore, the first base station, after receiving the
paging message transmitted by the core network, may further
determine the configuration information of the target cell(s)
according to a paging region, and generate the first indication
information on the basis of the paging message and the
configuration information of the target cell(s). The terminal,
after receiving the first indication information, may look for the
target cell(s) in a smaller range according to the paging
information and the configuration information of the target
cell(s), and transmit data with the target cell(s). For example,
the paging region indicated by the paging information is five
second cells on the second frequency band, and the configuration
information of the target cell(s) indicates that the target cell(s)
is within a range of three second cells in the five second cells.
Therefore, the range where the terminal looks for the target
cell(s) is narrowed, and the efficiency of determining the target
cell by the terminal may be improved.
[0102] Alternatively, the first indication information is the
system information of the second cell transmitted by the first base
station through the first cell. The system information includes the
information of the second frequency band and/or information of the
base station (i.e., second base station) containing the second cell
and/or information of the second cell.
[0103] The operation in S202 that the terminal receives the first
indication information in the first cell using the first frequency
band when no data is to be transmitted or received includes that,
the terminal receives system information of at least one second
cell in the first cell using the first frequency band, the system
information of the at least one second cell corresponding to the at
least one second cell.
[0104] The second frequency band information includes at least one
of the frequency band information, the bandwidth, the threshold
value or the offset. The corresponding base station information of
the second cell includes a second base station ID. The second cell
information includes at least one of a cell ID or a cell access
technology. It is to be understood that specific contents of the
second frequency band information, the corresponding base station
information of the cells (including the target cell(s) and the
second cell) and the cell (including the target cell(s) and the
second cell) information are listed above only for exemplary
description and should not form any limit to the disclosure. The
disclosure is also not limited thereto.
[0105] Alternatively, the operation in S204 that the terminal
determines the one or more second cells using the second frequency
band to be the target cell(s) according to the first indication
information includes that, the terminal determines one or more
second cells in the at least one second cell to be the target
cell(s) according to the system information of the at least one
second cell.
[0106] The terminal determines the one or more second cells from
the at least one second cell to be the target cell(s) according to
the system information of the at least one second cell on the basis
of the cell selection or cell reselection rule.
[0107] Exemplarily but unlimitedly, the access technology includes
an LTE technology, Wireless-Fidelity (Wi-Fi), a UTMS technology or
a 5th-Generation (5G) mobile communication technology.
[0108] It is to be understood that the access technology is listed
above only for exemplary description and should not form any limit
to the disclosure. The disclosure is also not limited thereto. The
terminal may also communicate through another existing access
technology or another future access technology.
[0109] In S206, the terminal performs cell synchronization with the
target, cell(s).
[0110] Specifically, before the operation that the terminal
performs data transmission in the second cell using the second
frequency band according to the first indication information when
there is data to be transmitted, the method 200 further includes
that, the terminal performs cell synchronization with the target
cell(s) according to the first indication information.
[0111] Synchronization between the terminal and the target cell(s)
may be classified into downlink synchronization and uplink
synchronization.
[0112] At first, the terminal performs downlink synchronization
with the target cell(s). In the embodiment of the disclosure, the
terminal may directly receive a downlink synchronization signal
(denoted as a target downlink synchronization signal for
convenience of distinction and description) periodically broadcast
by the target base station on the second frequency band for
downlink synchronization with the target cell(s), and may also
receive downlink synchronization information of the target cell(s)
transmitted by the first base station on the first frequency band
and perform downlink synchronization with the target cell(s)
according to the downlink synchronization information. A specific
process of downlink synchronization between the terminal and the
target cell(s) will be described below in detail.
[0113] In an implementation mode, the operation that the terminal
performs downlink synchronization with the target cell(s)
specifically includes the following operations. The terminal
receives at least one downlink synchronization signal transmitted
by at least one second base station on the second frequency band
according to the first indication information. The at least one
downlink synchronization signal corresponds to the at least one
second base station. Each downlink synchronization signal is from
the corresponding second base station.
[0114] The terminal determines the downlink synchronization signals
of the target cell(s) from the at least one downlink
synchronization signal.
[0115] The terminal performs downlink synchronization with the
target cell(s) according to the downlink synchronization signals of
the target cell(s).
[0116] Specifically, each second base station (including the target
base station) may periodically broadcast the downlink
synchronization signal of each second cell on the second frequency
band, for example, Primary Synchronization Signals (PSSs) and
Secondary Synchronization Signals (SSSs).
[0117] If there is only one second cell on the second frequency
band, the second cell is a target cell of the terminal. The
terminal, after receiving a PSS and SSS broadcast by a base station
(i.e., a second base station or a target base station) of the
second cell on the second frequency band, completes frame
synchronization and acquires a cell ID of the cell (i.e., the
target cell) corresponding to the downlink synchronization signals,
thereby completing downlink synchronization of the terminal and the
target cell.
[0118] If there are multiple second cells on the second frequency
band, a base station of each second cell may periodically broadcast
a downlink synchronization signal (denoted as a second downlink
synchronization signal for convenience of distinction and
description) of the respective cell. The second downlink
synchronization signal includes a downlink synchronization signal
of a target cell. The terminal, when receiving the second downlink
synchronization signals of the multiple second cells on the second
frequency band, may determine the downlink synchronization signal
of the target cell according to a cell ID of each second cell
corresponding to the second downlink synchronization signal of the
second cell, and a cell ID of the target cell indicated by the
first indication information or the cell ID of the target cell
determined through cell selection or cell reselection, and complete
downlink synchronization with the target cell.
[0119] In another implementation mode, the operation that the
terminal performs downlink synchronization with the target cell(s)
specifically includes the following actions.
[0120] The terminal receives downlink synchronization information
of the first cell in the first cell.
[0121] The terminal determines downlink synchronization information
of the target cell(s).
[0122] The terminal performs downlink synchronization with the
target cell(s) according to the downlink synchronization
information of the target cell(s).
[0123] The operation that the terminal determines the downlink
synchronization information of the target cell(s) includes the
following actions.
[0124] The terminal receives at least one downlink synchronization
offset information from the first base station through the first
cell and corresponding to the at least one second cell, each
downlink synchronization offset information including a time offset
between timing of the corresponding second cell and timing of the
first cell and the first base station being the base station
containing the first cell.
[0125] The terminal determines the downlink synchronization
information of the target cell(s) according to the downlink
synchronization offset information of the at least one second
cell.
[0126] Specifically, the terminal may receive the downlink
synchronization information of the first cell from the first base
station, the downlink synchronization information of the first cell
indicating a time offset between timing of the terminal and the
first cell. The terminal may further determine the downlink
synchronization information of the target cell(s) the downlink
synchronization information of the target cell(s) indicating (a)
time offset(s) between timing of the first cell and the second
cell(s).
[0127] The terminal may determine the downlink synchronization
information of the target cell(s) according to pre-stored time
offsets between base stations. For example, the terminal knows that
the time offset between the base stations is 2 ms.
[0128] The terminal may also determine the downlink synchronization
information of the target cell(s) according to downlink
synchronization information of the second cell transmitted by the
first base station. Specifically, the first base station transmits
at least one downlink synchronization information corresponding to
the at least one second cell to the terminal, each downlink
synchronization information including the time offset between the
timing of the corresponding second cell and the first cell. The
terminal may determine the time offsets of the target cell(s)
according to the determined cell information of the target
cell(s).
[0129] The terminal, after completing downlink synchronization with
the target cell(s), may further perform uplink synchronization with
the target cell(s).
[0130] Alternatively, the operation that the terminal performs
uplink synchronization with the target cell(s) specifically
includes the following actions.
[0131] The terminal transmits an uplink synchronization request to
the target base station containing the target cell(s) on the second
frequency band. The uplink synchronization request is configured to
obtain the uplink synchronization information of the terminal and
the target cell(s).
[0132] The terminal receives uplink synchronization information in
the first cell. The uplink synchronization information is acquired
by the first base station from the target base station, the uplink
synchronization information is determined by the target base
station on the basis of the uplink synchronization request and the
uplink synchronization information indicating a time offset between
timing of the terminal and the base station.
[0133] The terminal performs uplink synchronization with the target
cell(s) according to the uplink synchronization information.
[0134] The uplink synchronization request or a transmitting
resource (for example, a time-frequency resource) is determined by
the target base station and transmitted to the terminal through the
first base station.
[0135] Uplink synchronization request information is transmitted to
the terminal by the first base station, after the target base
station receives the uplink synchronization request from the
terminal, acknowledges the uplink synchronization request, and
allocates the transmitting resource.
[0136] The uplink synchronization request information includes
indication information of the transmitting resource.
[0137] Specifically, the terminal, before transmitting the uplink
synchronization request to the target base station on the second
frequency band, is required to know the time-frequency resource for
transmitting the uplink synchronization request. The time-frequency
resource may be requested by the first base station from the target
base station. Specifically, the first base station determines the
time-frequency resource, and then transmits the request for the
time-frequency resource to the target base station, the target base
station specifies the time-frequency resource, and then the first
base station transmits the indication information of the
time-frequency resource to the terminal. The time-frequency
resource may also be directly determined by the target base station
and the indication information of the time-frequency resource is
transmitted to the terminal by the first base station. The
terminal, after receiving the indication information of the
time-frequency resource, may transmit the uplink synchronization
request to the target base station on the specified time-frequency
resource. Or, the terminal transmits a Random Access (RA) request
to the target base station on the second frequency band. The uplink
synchronization request may include a random access preamble. The
target base station, after receiving the uplink synchronization
signal, may determine the uplink synchronization information
according to the received uplink synchronization request. The
uplink synchronization signal indicates the timing of the terminal,
and the uplink synchronization information indicates the time
offset between the timing of the terminal and the timing of the
target base station. Alternatively, the time offset may be an
uplink transmitting Time Alignment (TA). The terminal, after
receiving the uplink synchronization information, may regulate
uplink transmitting time according to the time offset to complete
uplink synchronization with the target cell(s). Or, the terminal
completes uplink synchronization for the target cell(s).
[0138] In the embodiment of the disclosure, the uplink
synchronization information to be transmitted to the terminal by
the target base station may be forwarded through the first base
station. That is, the terminal receives the uplink synchronization
information of the target cell(s) from the first base station on
the first frequency band, and the uplink synchronization
information of the target cell(s) is acquired by the first base
station from the target base station.
[0139] Therefore, the terminal completes uplink and downlink
synchronization with the target cell(s). In the embodiment of the
disclosure, for reducing relatively high power consumption probably
brought by reception of the downlink control signaling by the
terminal camping on the target cell(s), the terminal may be
controlled to, when there is no data transmission, keep
synchronized with the low-frequency cell (for example, the first
cell) and the target cell(s), and receive the downlink control
signaling of the target cell(s) in the low-frequency cell and, when
there is data to be transmitted, transmit data with the target base
station.
[0140] In S208, when there is data to be transmitted, the terminal
performs data transmission with the target cell(s) using the second
frequency band.
[0141] Specifically, data transmission of the terminal includes
uplink data transmission and downlink data transmission.
[0142] When the terminal has uplink data to be transmitted, the
terminal may directly transmit data to the target cell(s) according
to the received system information of the target cell(s). When the
network side has downlink data to be transmitted to the terminal,
the paging information may be transmitted firstly to enable the
terminal to access the target cell(s) or transmit data with the
target cell(s) according to the paging information.
[0143] When there is uplink data to be transmitted, the first
indication information is the system information of each second
cell. The first base station may acquire the system information of
each second cell from the serving base station (i.e., the second
base station) of the second cell, or may pre-store the system
information of each second cell. The first base station may
periodically broadcast the system information of each second cell.
The terminal may determine the system information of the target
cell(s) according to the received system information of each second
cell and the cell IDs of the target cell(s) determined by the
terminal and transmit data with the target base station according
to the system information of the target cell(s).
[0144] When there is downlink data to be transmitted, the first
indication information is the paging information, or the first
indication information is the paging information and the
configuration information of the target cell(s). The terminal may
directly determine the target cell(s) according to the first
indication information and transmit data with the target base
station.
[0145] In such a manner, according to the data transmission method
of the embodiment of the disclosure, the terminal completes
synchronization with a target cell in advance on the first
frequency band and, when there is data to be transmitted, performs
data transmission with the target cell, so that relatively high
power consumption probably brought by reception of downlink control
signaling by the terminal camping on a high frequency band is
avoided. Meanwhile, synchronization with the target cell is
completed in advance to make it possible to access a
high-frequency-band cell as fast as possible or implement data
transmission with the target cell when there is data to be
transmitted. Compared with the prior art, the method greatly
reduces the cell access flow in the prior art and reduces a
signaling overhead.
[0146] The data transmission method according to the embodiments of
the disclosure has been described above in combination with FIG. 2
in detail. A data transmission device according to the embodiments
of the disclosure will be described below in combination with FIG.
3 to FIG. 5 in detail.
[0147] FIG. 3 illustrates a schematic block diagram of a terminal
300 according to an embodiment of the disclosure. As illustrated in
FIG. 3, the terminal 300 includes a transceiver unit 310.
[0148] The transceiver unit 310 is configured to, when no data is
to be transmitted or received, receive first indication information
in a first cell using a first frequency band, the first indication
information being configured to instruct the terminal receiving the
first indication information to perform data transmission using a
second frequency band when there is data to be transmitted.
[0149] The transceiver unit 310 is further configured to, when
there is data to be transmitted, perform data transmission in a
second cell using the second frequency band according to the first
indication information.
[0150] Alternatively, the terminal 300 further includes a
determination unit and a processing unit.
[0151] The determination unit is configured to determine one or
more second cells using the second frequency band to be (a) target
cell(s) according to the first indication information.
[0152] The processing unit is configured to perform cell
synchronization with the target cell(s).
[0153] The transceiver unit 310 is specifically configured to, when
there is data to be transmitted, perform data transmission with the
target cell(s) using the second frequency band.
[0154] Alternatively, the first indication information is paging
information transmitted by a first base station through the first
cell, or the first indication information is paging information and
configuration information of the target cell(s). The first
indication information includes information of a second frequency
band and/or information of a base station (i.e., target base
station) containing the target cell(s) and/or information of the
target cell. The first base station is a base station containing
the first cell.
[0155] The determination unit is specifically configured to
determine the target cell(s) according to the paging
information.
[0156] Or, the determination unit is specifically configured to
determine the target cell(s) according to the paging information
and the configuration information of the target cell(s).
[0157] Alternatively, the first indication information is system
information of the second cell transmitted by the first base
station through the first cell. The system information of the
second cell includes the information of the frequency band of the
second cell and/or information of the base station (i.e., second
base station) containing the second cell and/or information of the
second cell. The first base station is the base station containing
the first cell.
[0158] The transceiver unit 310 is specifically configured to
receive system information of at least one second cell in the first
cell using the first frequency band. The system information of the
at least one second cell corresponds to the at least one
second'cell.
[0159] The determination unit is specifically configured to
determine one or more second cells from the at least one second
cell to be (a) target cell(s) according to the system information
of the at least one second cell.
[0160] Alternatively, the transceiver unit 310 is further
configured to transmit an uplink synchronization request to a
target base station containing the target cell(s) on the second
frequency band. The uplink synchronization request is configured to
obtain uplink synchronization information between the terminal and
the target cell(s).
[0161] The transceiver unit 310 is further configured to receive
the uplink synchronization information in the first cell. The
uplink synchronization information is acquired by the first base
station from the target base station, the uplink synchronization
information is determined by the target base station on the basis
of the uplink synchronization request, and the first base station
is the base station containing the first cell.
[0162] The processing unit is specifically configured to perform
uplink synchronization with the target cell(s) according to the
uplink synchronization information.
[0163] Alternatively, the transceiver unit 310 is further
configured to receive downlink synchronization information of the
first cell in the first cell.
[0164] The determination unit is further configured to determine
downlink synchronization information of the target cell(s).
[0165] The processing unit is specifically configured to perform
downlink synchronization with the target cell(s) according to the
downlink synchronization information of the target cell(s).
[0166] Alternatively, the transceiver unit 310 is further
configured to receive at least one downlink synchronization offset
information transmitted by the first base station through the first
cell and corresponding to the at least one second cell. Each
downlink synchronization offset information includes a time offset
between timing of the corresponding second cell and timing of the
first cell, and the first base station is the base station
containing the first cell.
[0167] The determination unit is specifically configured to
determine the downlink synchronization information of the target
cell(s) according to the downlink synchronization offset
information of the at least one second cell.
[0168] The terminal 300 according to the embodiment of the
disclosure may correspond to a terminal in the data transmission
method of the embodiments of the disclosure. Moreover, each unit in
the terminal 300 and the other abovementioned operations and/or
functions are adopted to implement the corresponding flows of the
method in FIG. 2 respectively and will not be elaborated herein for
simplicity.
[0169] In such a manner, the terminal according to the embodiment
of the disclosure completes synchronization with a target cell in
advance on the first frequency band and, when there is data to be
transmitted, performs data transmission with the target cell, so
that relatively high power consumption probably brought by
reception of downlink control signaling by the terminal camping on
a high frequency band is avoided. Meanwhile, synchronization with
the target cell is completed in advance to make it possible to
implement data transmission with the target cell when there is data
to be transmitted. Compared with the prior art, the terminal
according to the embodiment of the disclosure greatly reduces cell
access process in the prior art and reduces a signaling
overhead.
[0170] FIG. 4 illustrates a schematic block diagram of a base
station 400 according to an embodiment of the disclosure. As
illustrated in FIG. 4, the base station 400 includes a
determination unit 410 and a transceiver unit 420.
[0171] The determination unit 410 is configured to determine first
indication information. The first indication information is
configured to instruct a terminal receiving the first indication
information to transmit data in a second cell using a second
frequency band. The base station is a base station containing a
first cell using a first frequency band.
[0172] The transceiver unit 420 is configured to transmit the first
indication information through the first cell.
[0173] Alternatively, the first indication information is paging
information or paging information and configuration information of
a target cell. The first indication information includes
information of a second frequency band and/or information of a base
station (i.e., target base station) containing the target cell(s)
and/or information of the target cell. The second cell includes the
target cell. A target base station is a base station containing the
target cell.
[0174] The transceiver unit 420 is specifically configured to
transmit the paging information through the first cell.
[0175] Or, the transceiver unit 420 is specifically configured to
transmit the paging information and the configuration information
of the target cell through the first cell.
[0176] Alternatively, the first indication information is system
information of the second cell. The system information of the
second cell includes information of the frequency band of the
second cell and/or information of a base station containing the
second cell and/or information of the second cell.
[0177] The transceiver unit 420 is further configured to receive
system information of at least one second cell, transmitted by at
least one second base station, the system information of the at
least one second cell corresponding to the at least one second
cell.
[0178] The transceiver unit 420 is specifically configured to
transmit the system information of the at least one second cell
through the first cell.
[0179] Alternatively, the transceiver unit 420 is further
configured to transmit uplink synchronization information through
the first cell. The uplink synchronization information is acquired
by the base station from the target base station, and the uplink
synchronization information is determined by the target base
station on the basis of an uplink synchronization request
transmitted to the target base station by the terminal on the
second frequency band. The target base station is the base station
containing the target cell. The target cell is determined by the
terminal from the at least one second cell.
[0180] Alternatively, the transceiver unit 420 is further
configured to transmit downlink synchronization information of the
first cell to the terminal through the first cell.
[0181] Alternatively, the transceiver unit 420 is further
configured to transmit at least one downlink synchronization offset
information corresponding to the at least one second cell to the
terminal through the first cell. Each downlink synchronization
offset information includes a time offset between timing of the
corresponding second cell and timing of the first cell.
[0182] The base station 400 according to the embodiment of the
disclosure may correspond to a first base station in the data
transmission method of the embodiments of the disclosure. Moreover,
each unit in the base station 400 and the other abovementioned
operations and/or functions are adopted to implement the
corresponding flows of the method in FIG. 2 respectively and will
not be elaborated herein for simplicity.
[0183] In such a manner, the base station according to the
embodiment of the disclosure transmits downlink control signaling
to the terminal on the first frequency band, to enable the terminal
to complete synchronization with a target cell in advance on the
first frequency band, and when there is data to be transmitted, the
terminal may perform data transmission with the target cell, so
that relatively high power consumption probably brought by
reception of downlink control signaling by the terminal camping on
a high frequency band is avoided. Meanwhile, synchronization with
the target cell is completed in advance to make it possible to
implement data transmission with the target cell when there is data
to be transmitted. Compared with a prior art, the base station
according to the embodiment of the disclosure greatly reduces cell
access process in the prior art and reduces a signaling
overhead.
[0184] FIG. 5 illustrates a schematic block diagram of another base
station 500 according to another embodiment of the disclosure. As
illustrated in FIG. 5, the base station 500 includes a transceiver
unit 510.
[0185] The transceiver unit 510 is configured to transmit system
information of a second cell to a first base station. The system
information is configured to indicate a system parameter of the
second cell, a carrier frequency corresponding to the second cell
belongs to a second frequency band, the first base station is a
base station containing a first cell using a first frequency band
and the second base station pre-stores a mapping relationship
between the second cell and the first cell.
[0186] The transceiver unit 510 is further configured to transmit
data with a terminal through the second cell.
[0187] Alternatively, the transceiver unit 510 is further
configured to receive an uplink synchronization request transmitted
by the terminal on the second frequency band. The uplink
synchronization request is configured to obtain uplink
synchronization information of the terminal and the second
cell.
[0188] The transceiver unit 510 is further configured to determine
the uplink synchronization information according to the uplink
synchronization request and transmit the uplink synchronization
information to the first base station.
[0189] The base station 500 according to the embodiment of the
disclosure may correspond to a second base station in the data
transmission method of the embodiments of the disclosure. Moreover,
each unit in the base station 500 and the other abovementioned
operations and/or functions are adopted to implement the
corresponding flows of the method in FIG. 2 respectively and will
not be elaborated herein for simplicity.
[0190] In such a manner, according to the base station of the
embodiment of the disclosure, the terminal in the first cell
completes synchronization with the target cell in advance, and when
there is data to be transmitted, data transmission is performed
with the terminal, so that relatively high power consumption
probably brought by reception of downlink control signaling by the
terminal camping on a high frequency band is avoided. Meanwhile,
synchronization with the target cell is completed in advance to
make it possible to implement data transmission with the target
cell when there is data to be transmitted. Compared with the prior
art, the base station of the embodiment of the disclosure greatly
reduces cell access process in the prior art and reduces a
signaling overhead.
[0191] The data transmission device according to the embodiments of
the disclosure has been described above in combination with FIG. 3
to FIG. 5 in detail. A data transmission device according to the
embodiments of the disclosure will be described below in
combination with FIG. 6 to FIG. 8 in detail.
[0192] FIG. 6 illustrates a schematic block diagram of a terminal
600 according to an embodiment of the disclosure. As illustrated in
FIG. 6, the terminal 600 includes a transceiver 610, a processor
620, a memory 630 and a bus system 640. The processor 620, the
memory 630 and the transceiver 610 are connected through the bus
system 640. The memory 630 is configured to store instructions. The
processor 620 is configured to execute the instructions stored in
the memory 630 to control the transceiver 610 to transmit and
receive information.
[0193] The transceiver 610 is configured to, when no data is to be
transmitted or received, receive first indication information in a
first cell using a first frequency band. The first indication
information is configured to instruct the terminal receiving the
first indication information to perform data transmission using a
second frequency band when there is data to be transmitted.
[0194] The transceiver 610 is further configured to, when there is
data to be transmitted, perform data transmission in a second cell
using the second frequency band according to the first indication
information.
[0195] It is to be understood that, in the embodiment of the
disclosure, the processor 620 may be a Central Processing Unit
(CPU), or the processor 620 may be another universal processor, a
Digital Signal Processor (DSP), an Application Specific Integrated
Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or another
programmable logic device, discrete gate or transistor logic device
and discrete hardware component and the like. The universal
processor may be a microprocessor or the processor may also be any
conventional processor and the like.
[0196] The memory 630 may include a Read-Only Memory (ROM) and a
Random Access Memory (RAM) and provides an instruction and data for
the processor 620. A part of the memory 630 may further include a
nonvolatile RAM. For example, the memory 630 may further store
information of a device type.
[0197] The bus system 640 includes a data bus, and may further
include a power bus, a control bus, a state signal bus and the
like. However, for clear description, various buses in the figure
are marked as the bus system 640.
[0198] In an implementation process, each action of the method may
be completed by an integrated logic circuit of hardware in the
processor 620 or instructions in a software form. The actions of a
supercell handover method disclosed in combination with the
embodiments of the disclosure may be directly embodied to be
executed and completed by a hardware processor or executed and
completed by a combination of hardware and software modules in the
processor. The software module may be located in a mature storage
medium in this field such as a RAM, a flash memory, a ROM, a
programmable ROM or electrically erasable programmable ROM and a
register. The storage medium is located in the memory 630. The
processor 620 reads information in the memory 630 and completes the
actions of the method in combination with hardware. No more
detailed descriptions will be made herein to avoid repetitions.
[0199] Alternatively, the processor 620 is configured to determine
one or more second cells using the second frequency band to be (a)
target cell(s) according to the first indication information.
[0200] The processor 620 is further configured to perform cell
synchronization with the target cell(s).
[0201] The transceiver 610 is specifically configured to, when
there is data to be transmitted, perform data transmission with the
target cell(s) using the second frequency band.
[0202] Alternatively, the first indication information is paging
information, or the first indication information is paging
information and configuration information of the target cell(s)
transmitted by a first base station through the first cell. The
first indication information includes information of a second
frequency band and/or information of a base station containing the
target cell(s) and/or information of the target cell. The first
base station is a base station containing the first cell.
[0203] The processor 620 is specifically configured to determine
the target cell(s) according to the paging information.
[0204] Or, the processor 620 is specifically configured to
determine the target cell(s) according to the paging information
and the configuration information of the target cell(s).
[0205] Alternatively, the first indication information is system
information of the second cell transmitted by the first base
station through the first cell. The system information of the
second cell includes information of the frequency band of the
second cell and/or information of the base station containing the
second cell and/or information of the second cell. The first base
station is the base station containing the first cell.
[0206] The transceiver 610 is specifically configured to receive
system information of at least one second cell in the first cell
using the first frequency band. The system information of the at
least one second cell correspond to the at least one second
cell.
[0207] The processor 620 is specifically configured to determine
one or more second cells from the at least one second cell to be
(a) target cell(s) according to the system information of the at
least one second cell.
[0208] Alternatively, the transceiver 610 is further configured to
transmit an uplink synchronization request to a target base station
containing the target cell(s) on the second frequency band. The
uplink synchronization request is configured to obtain uplink
synchronization information of the terminal and the target
cell(s).
[0209] The transceiver 610 is further configured to receive the
uplink synchronization information in the first cell. The uplink
synchronization information is acquired by the first base station
from the target base station, the uplink synchronization
information is determined by the target base station on the basis
of the uplink synchronization request, and the first base station
is the base station containing the first cell.
[0210] The processor 620 is specifically configured to perform
uplink synchronization with the target cell(s) according to the
uplink synchronization information.
[0211] Alternatively, the transceiver 610 is further configured to
receive downlink synchronization information of the first cell in
the first cell.
[0212] The processor 620 is further configured to determine
downlink synchronization information of the target cell(s).
[0213] The processor 620 is specifically configured to perform
downlink synchronization with the target cell(s) according to the
downlink synchronization information of the target cell(s).
[0214] Alternatively, the transceiver 610 is further configured to
receive at least one downlink synchronization offset information
transmitted by the first base station through the first cell and
corresponding to the at least one second cell. Each downlink
synchronization offset information includes a time offset between
timing of the corresponding second cell and timing of the first
cell, and the first base station is the base station containing the
first cell.
[0215] The processor 620 is specifically configured to determine
the downlink synchronization information of the target cell(s)
according to the downlink synchronization offset information of the
at least one second cell.
[0216] The terminal 600 according to the embodiment of the
disclosure may correspond to the terminal in the data transmission
method of the embodiments of the disclosure. Moreover, each module
in the terminal 600 and the other abovementioned operations and/or
functions are adopted to implement the corresponding flows of the
method in FIG. 2 respectively and will not be elaborated herein for
simplicity.
[0217] In such a manner, the terminal according to the embodiment
of the disclosure completes synchronization with a target cell in
advance on the first frequency band and, when there is data to be
transmitted or received, performs data transmission with the target
cell, so that relatively high power consumption probably brought by
reception of downlink control signaling by the terminal camping on
a high frequency band is avoided. Meanwhile, synchronization with
the target cell is completed in advance to make it possible to
implement data transmission with the target cell when there is data
to be transmitted. Compared with the prior art, the terminal
according to the embodiment of the disclosure greatly reduces cell
access process in the prior art and reduces a signaling
overhead.
[0218] FIG. 7 illustrates a schematic block diagram of a base
station 700 according to an embodiment of the disclosure. As
illustrated in FIG. 7, the base station 700 includes a transceiver
710, a processor 720, a memory 730 and a bus system 740. The
processor 720, the memory 730 and the transceiver 710 are connected
through the bus system 740. The memory 730 is configured to store
instructions. The processor 720 is configured to execute the
instructions stored in the memory 730 to control the transceiver
710 to transmit and receive information.
[0219] The processor 720 is configured to determine first
indication information, the first indication information being
configured to instruct a terminal receiving the first indication
information to transmit data in a second cell using a second
frequency band, and the base station is a base station containing a
first cell using a first frequency band.
[0220] The transceiver 710 is configured to transmit the first
indication information through the first cell.
[0221] Alternatively, the first indication information is paging
information, or the first indication information is paging
information and configuration information of a target cell. The
first indication information includes information of a second
frequency band and/or information of a base station containing the
target cell(s) and/or information of the target cell. The second
cell includes the target cell. A target base station is a base
station containing the target cell.
[0222] The transceiver 710 is specifically configured to transmit
the paging information through the first cell.
[0223] The transceiver 710 is specifically configured to transmit
the paging information and the configuration information of the
target cell through the first cell.
[0224] Alternatively, the first indication information is system
information of the second cell. The system information of the
second cell includes information of the frequency band of the
second cell and/or information of the base station containing the
second cell and/or information of the second cell.
[0225] The transceiver 710 is further configured to receive system
information of at least one second cell transmitted by at least one
second base station. The system information of the at least one
second cell corresponds to the at least one second cell.
[0226] The transceiver 710 is specifically configured to transmit
the system information of the at least one second cell through the
first cell.
[0227] Alternatively, the transceiver 710 is further configured to
transmit uplink synchronization information through the first cell.
The uplink synchronization information is acquired by the base
station from the target base station, and the uplink
synchronization information is determined by the target base
station on the basis of an uplink synchronization request
transmitted to the target base station by the terminal on the
second frequency band. The target base station is the base station
containing the target cell. The target cell is determined by the
terminal from the at least one second cell.
[0228] Alternatively, the transceiver 710 is further configured to
transmit downlink synchronization information of the first cell to
the terminal through the first cell.
[0229] Alternatively, the transceiver 710 is further configured to
transmit at least one downlink synchronization offset information
corresponding to the at least one second cell to the terminal
through the first cell. Each downlink synchronization offset
information includes a time offset between timing of the
corresponding second cell and timing of the first cell.
[0230] The base station 700 according to the embodiment of the
disclosure may correspond to the first base station in the data
transmission method of the embodiments of the disclosure. Moreover,
each module in the base station 700 and the other abovementioned
operations and/or functions are adopted to implement the
corresponding flows of the method in FIG. 2 respectively and will
not be elaborated herein for simplicity.
[0231] In such a manner, the base station according to the
embodiment of the disclosure transmits downlink control signaling
to the terminal on the first frequency band, to enable the terminal
to complete synchronization with a target cell in advance on the
first frequency band and, when there is data to be transmitted, the
terminal may perform data transmission with the target cell, so
that relatively high power consumption probably brought by
reception of downlink control signaling by the terminal camping on
a high frequency band is avoided. Meanwhile, synchronization with
the target cell is completed in advance to make it possible to
implement data transmission with the target cell when there is data
to be transmitted. Compared with the prior art, the base station
according to the embodiment of the disclosure greatly reduces cell
access process in the prior art and reduces a signaling
overhead.
[0232] FIG. 8 illustrates a schematic block diagram of another base
station 800 according to another embodiment of the disclosure. As
illustrated in FIG. 8, the base station 800 includes a transceiver
810, a processor 820, a memory 830 and a bus system 840. The
processor 820, the memory 830 and the transceiver 810 are connected
through the bus system 840. The memory 830 is configured to store
instructions. The processor 820 is configured to execute the
instructions stored in the memory 830 to control the transceiver
810 to transmit and receive information.
[0233] The transceiver 810 is configured to transmit system
information of a second cell to a first base station. The system
information is configured to indicate a system parameter of the
second cell. A carrier frequency corresponding to the second cell
belongs to a second frequency band, the first base station is a
base station containing a first cell using a first frequency band,
and the second base station pre-stores a mapping relationship
between the second cell and the first cell.
[0234] The transceiver 810 is further configured to transmit data
with a terminal through the second cell.
[0235] Alternatively, the transceiver 810 is further configured to
receive an uplink synchronization request transmitted by the
terminal on the second frequency band. The uplink synchronization
request is configured to obtain uplink synchronization information
between the terminal and the second cell.
[0236] The transceiver 810 is further configured to determine the
uplink synchronization information according to the uplink
synchronization request and transmit the uplink synchronization
information to the first base station.
[0237] The base station 800 according to the embodiment of the
disclosure may correspond to a second base station in the data
transmission method of the embodiments of the disclosure. Moreover,
each module in the base station 800 and the other abovementioned
operations and/or functions are adopted to implement the
corresponding flow of the method in FIG. 2 respectively and will
not be elaborated herein for simplicity.
[0238] In such a manner, according to the base station of the
embodiment of the disclosure, the terminal in the first cell
completes synchronization with the target cell in advance and, when
there is data to be transmitted, data transmission is performed
with the terminal, so that relatively high power consumption
probably brought by reception of downlink control signaling by the
terminal camping on a high frequency band is avoided. Meanwhile,
synchronization with the target cell is completed in advance to
make it possible to implement data transmission with the target
cell when there is data to be transmitted. Compared with the prior
art, the base station according to the embodiment of the disclosure
greatly reduces cell access process in the prior art and reduces a
signaling overhead.
[0239] It is to be understood that term "and/or" in the disclosure
is only an association relationship describing associated objects
and represents that three relationships may exist. For example, A
and/or B may represent three conditions: i.e., independent
existence of A, existence of both A and B and independent existence
of B. In addition, character "/" in the disclosure usually
represents that previous and next associated objects form an "or"
relationship.
[0240] It is to be understood that, in various embodiments of the
disclosure, a magnitude of a sequence number of each process does
not mean an execution sequence and the execution sequence of each
process should be determined by its function and an internal logic
and should not form any limit to an implementation process of the
embodiments of the disclosure.
[0241] Those of ordinary skill in the art may realize that the
units and algorithm actions of each example described in
combination with the embodiments disclosed in the disclosure may be
implemented by electronic hardware or a combination of computer
software and the electronic hardware. Whether these functions are
executed in a hardware or software manner depends on specific
applications and design constraints of the technical solutions.
Professionals may realize the described functions for each specific
application by use of different methods, but such realization shall
fall within the scope of the disclosure.
[0242] Those skilled in the art may clearly learn about that
specific working processes of the system, device and unit described
above may be seen from the corresponding processes in the method
embodiment and will not be elaborated herein for convenient and
brief description.
[0243] In some embodiments provided by the disclosure, it is to be
understood that the disclosed system, device and method may be
implemented in another manner. For example, the device embodiment
described above is only schematic, and for example, division of the
units is only logic function division, and other division manners
may be adopted during practical implementation. For example,
multiple units or components may be combined or integrated into
another system, or some characteristics may be neglected executed.
In addition, coupling or direct coupling or communication
connection between each displayed or discussed component may be
indirect coupling or communication connection, implemented through
some interfaces, of the device or the units, and may be electrical
and mechanical or adopt other forms.
[0244] The units described as separate parts may or may not be
physically separated, and parts displayed as units may or may not
be physical units, and namely may be located in the same place, or
may also be distributed to multiple network units. Part or all of
the units may be selected to achieve the purpose of the solutions
of the embodiments according to a practical requirement.
[0245] In addition, each function unit in each embodiment of the
disclosure may be integrated into a processing unit, each unit may
also exist independently, and two or more than two units may also
be integrated into a unit.
[0246] When being realized in form of software functional unit and
sold or used as an independent product, the function may also be
stored in a computer-readable storage medium. Based on such an
understanding, the technical solutions of the disclosure
substantially or parts making contributions to the prior art or
part of the technical solutions may be embodied in form of software
product, and the computer software product is stored in a storage
medium, including a plurality of instructions configured to enable
a computer device (which may be a personal computer, a server, a
network device or the like) to execute all or part of the actions
of the method in each embodiment of the disclosure. The
abovementioned storage medium includes: various media capable of
storing program codes such as a U disk, a mobile hard disk, a
Read-Only Memory (ROM), a RAM, a magnetic disk or an optical
disk.
[0247] The above is only the specific implementation mode of the
disclosure and not intended to limit the scope of protection of the
disclosure. Any variations or replacements apparent to those
skilled in the art within the technical scope disclosed by the
disclosure shall fall within the scope of protection of the
disclosure. Therefore, the scope of protection of the disclosure
shall be subject to the scope of protection of the claims.
* * * * *