U.S. patent number RE44,928 [Application Number 13/941,277] was granted by the patent office on 2014-06-03 for method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system.
This patent grant is currently assigned to LG Electronics Inc.. The grantee listed for this patent is LG Electronics Inc.. Invention is credited to Joon Kui Ahn, Eun Sun Kim, Ki Jun Kim, Dae Won Lee, Dong Youn Seo, Suk Hyon Yoon, Young Woo Yun.
United States Patent |
RE44,928 |
Ahn , et al. |
June 3, 2014 |
Method for receiving control information in orthogonal frequency
division multiplexing system of mobile communication system
Abstract
The present invention relates to receiving control information
in an orthogonal frequency division multiplexing (OFDM) system of a
mobile communication system. The present invention includes
receiving information related to a number of OFDM symbols in a
subframe for receiving first control information, receiving
information related to a number of OFDM symbols in the subframe for
receiving second control information, decoding the first control
information according to the received information related to the
number of OFDM symbols in the subframe for receiving the first
control information, and decoding the second control information
according to the received information related to the number of OFDM
symbols in the subframe for receiving the second control
information, wherein the number of OFDM symbols for receiving the
first control information is less than or equal to the number of
OFDM symbols for receiving the second control information.
Inventors: |
Ahn; Joon Kui (Seoul,
KR), Yun; Young Woo (Seoul, KR), Kim; Ki
Jun (Seoul, KR), Kim; Eun Sun (Jeonju-si,
KR), Lee; Dae Won (Suwon-si, KR), Seo; Dong
Youn (Seoul, KR), Yoon; Suk Hyon (Seoul,
KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
LG Electronics Inc. |
Seoul |
N/A |
KR |
|
|
Assignee: |
LG Electronics Inc. (Seoul,
KR)
|
Family
ID: |
40370556 |
Appl.
No.: |
13/941,277 |
Filed: |
July 12, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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12143647 |
Sep 13, 2011 |
8019017 |
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60945585 |
Jun 21, 2007 |
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60946400 |
Jun 27, 2007 |
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Reissue of: |
12942968 |
Nov 9, 2010 |
8009760 |
Aug 30, 2011 |
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Foreign Application Priority Data
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Nov 29, 2007 [KR] |
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10-2007-0122985 |
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Current U.S.
Class: |
375/295;
370/342 |
Current CPC
Class: |
H04J
11/0036 (20130101); H04L 5/0094 (20130101); H04L
27/2601 (20130101); H04L 5/0007 (20130101); H04L
5/0053 (20130101); H04L 1/1812 (20130101) |
Current International
Class: |
H04L
27/00 (20060101); H04B 7/216 (20060101) |
Field of
Search: |
;375/295,219,260,267,300
;370/267,280,329,342,468 ;455/101,509 ;714/718 |
References Cited
[Referenced By]
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Primary Examiner: Tran; Khai
Attorney, Agent or Firm: Lee, Hong, Degerman, Kang &
Waimey
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is .Iadd.a reissue application of U.S. Pat. No.
8,009,760 B2, which is .Iaddend.a continuation of U.S. .Iadd.patent
.Iaddend.application Ser. No. 12/143,647, filed Jun. 20, 2008,
.Iadd.now U.S. Pat. No. 8,019,017.Iaddend., which claims the
benefit of earlier filing date and right of priority to Korean
.Iadd.Patent .Iaddend.Application No. 10-2007-0122985, filed on
Nov. 29, 2007, and .Iadd.also claims the benefit of .Iaddend.U.S.
Provisional Application Ser. Nos. 60/945,585, filed on Jun. 21,
2007, and 60/946,400, filed on Jun. 27, 2007, the contents of which
are .Iadd.all .Iaddend.hereby incorporated by reference herein in
their entirety.
Claims
What is claimed is:
1. A method of transmitting downlink .Iadd.control
.Iaddend.channels at a base station of an orthogonal frequency
division multiplexing (OFDM) system, the method comprising:
transmitting first information .[.indicating.]. .Iadd.related to
.Iaddend.a size m of a first region through a broadcast channel,
wherein the first region is defined by m OFDM symbol(s) starting
from a beginning of a subframe and the first region is used for
first .Iadd.control .Iaddend.channels that carry hybrid automatic
repeat request (HARQ) ACK/NACKs; transmitting second information
.[.indicating.]. .Iadd.related to .Iaddend.a size n of a second
region through a physical control format indicator channel
(PCFICH), wherein the second region is defined by n OFDM symbol(s)
starting from the beginning of the subframe and the second region
is used for second .Iadd.control .Iaddend.channels that carry
downlink control information; and transmitting the HARQ ACK/NACKs
and the downlink control information through the first
.Iadd.control .Iaddend.channels and second .Iadd.control
.Iaddend.channels, respectively, wherein first resources for the
first .Iadd.control .Iaddend.channels are identified from the first
information, and second resources for the second .Iadd.control
.Iaddend.channels are identified from remaining resources
.[.excluding.]. .Iadd.other than .Iaddend.the first resources
within the second region, and wherein the second .Iadd.control
.Iaddend.channels are physical downlink control channels
(PDCCHs).
2. The method of claim 1, wherein the size n is configured to be
equal to or greater than the size m such that n.gtoreq.m.
3. A method of receiving downlink .Iadd.control .Iaddend.channels
at a mobile terminal of an orthogonal frequency division
multiplexing (OFDM) system, the method comprising: receiving first
information .[.indicating.]. .Iadd.related to .Iaddend.a size m of
a first region through a broadcast channel, wherein the first
region is defined by m OFDM symbol(s) starting from a beginning of
a subframe and the first region is used for first .Iadd.control
.Iaddend.channels that carry hybrid automatic repeat request (HARQ)
ACK/NACKs; receiving second information .[.indicating.].
.Iadd.related to .Iaddend.a size n of a second region through a
physical control format indicator channel (PCFICH), wherein the
second region is defined by n OFDM symbol(s) starting from the
beginning of the subframe and the second region is used for second
.Iadd.control .Iaddend.channels that carry downlink control
information; and receiving the HARQ ACK/NACKs and the downlink
control information through the first .Iadd.control
.Iaddend.channels and second .Iadd.control .Iaddend.channels,
respectively, wherein first resources for the first .Iadd.control
.Iaddend.channels are identified from the first information, and
second resources for the second .Iadd.control .Iaddend.channels are
identified from remaining resources .[.excluding.]. .Iadd.other
than .Iaddend.the first resources within the second region, and
wherein the second .Iadd.control .Iaddend.channels are physical
downlink control channels (PDCCHs).
4. The method of claim 3, wherein the size n is configured to be
equal to or greater than the size m such that n.gtoreq.m.
5. The method of claim 3, further comprising: performing operations
in accordance with one of the second .Iadd.control
.Iaddend.channels received through the second region that is
designated to the mobile terminal.
6. A base station used in an orthogonal frequency division
multiplexing (OFDM) system, the base station comprising: a radio
frequency unit; and a processor, wherein the processor is
configured to: transmit first information .[.indicating.].
.Iadd.related to .Iaddend.a size m of a first region through a
broadcast channel, wherein the first region is defined by m OFDM
symbol(s) starting from beginning of a subframe and the first
region is used for first .Iadd.control .Iaddend.channels that carry
hybrid automatic repeat request (HARQ) ACK/NACKs; transmit second
information .[.indicating.]. .Iadd.related to .Iaddend.a size n of
a second region through a physical control format indicator channel
(PCFICH), wherein the second region is defined by n OFDM symbol(s)
starting from the beginning of the subframe and the second region
is used for second .Iadd.control .Iaddend.channels that carry
downlink control information; and transmit the HARQ ACK/NACKs and
the downlink control information through the first .Iadd.control
.Iaddend.channels and second .Iadd.control .Iaddend.channels,
respectively, wherein first resources for the first .Iadd.control
.Iaddend.channels are identified from the first information, and
second resources for the second .Iadd.control .Iaddend.channels are
identified from remaining resources .[.excluding.]. .Iadd.other
than .Iaddend.the first resources within the second region, and
wherein the second .Iadd.control .Iaddend.channels are physical
downlink control channels (PDCCHs).
7. The base station of claim 6, wherein the size n is configured to
be equal to or greater than the size m such that n.gtoreq.m.
8. A mobile terminal used in an orthogonal frequency division
multiplexing (OFDM) system, the mobile terminal comprising: a radio
frequency unit; and a processor, wherein the processor is
configured to: receive first information .[.indicating.].
.Iadd.related to .Iaddend.a size m of a first region through a
broadcast channel, wherein the first region is defined by m OFDM
symbol(s) starting from a beginning of a subframe and the first
region is used for first .Iadd.control .Iaddend.channels that carry
hybrid automatic repeat request (HARQ) ACK/NACKs; receive second
information .[.indicating.]. .Iadd.related to .Iaddend.a size n of
a second region through a physical control format indicator channel
(PCFICH), wherein the second region is defined by n OFDM symbol(s)
starting from the beginning of the subframe and the second region
is used for second .Iadd.control .Iaddend.channels that carry
downlink control information; and receive the HARQ ACK/NACKs and
the downlink control information through the first .Iadd.control
.Iaddend.channels and second .Iadd.control .Iaddend.channels,
respectively, wherein first resources for the first .Iadd.control
.Iaddend.channels are identified from the first information, and
second resources for the second .Iadd.control .Iaddend.channels are
identified from remaining resources .[.excluding.]. .Iadd.other
than .Iaddend.the first resources within the second region, and
wherein the second .Iadd.control .Iaddend.channels are physical
downlink control channels (PDCCHs).
9. The mobile terminal of claim 8, wherein the size n is configured
to be equal to or greater than the size m such .[.as.]. .Iadd.that
.Iaddend.n.gtoreq.m.
10. The mobile terminal of claim 8, wherein the processor is
further configured to: perform operations in accordance with one of
the second .Iadd.control .Iaddend.channels received through the
second region that is designated to the mobile terminal.
Description
FIELD OF THE INVENTION
The present invention relates to a mobile communication system, and
more particularly, to a method for receiving control information in
an orthogonal frequency division multiplexing system of the mobile
communication system.
BACKGROUND OF THE INVENTION
In a cellular orthogonal frequency division multiplexing (OFDM)
radio packet communication system, uplink and downlink data packet
transmissions are transmitted via a subframe unit. A subframe is
defined as a predetermined time period including a plurality of
OFDM symbols. Currently, various control information for
uplink/downlink data packet transmissions are also transmitted.
Such control information includes information necessary for
transmitting and receiving the uplink/downlink data packets, such
as radio resource information used for transmitting and receiving
the uplink/downlink data packets, a coding scheme, and a modulation
scheme, for example. The control information is transmitted using
at least one of the plurality of OFDM symbols included in the
subframe.
A plurality of mobile terminals may communicate through one base
station in a cellular OFDM radio packet communication system.
Accordingly, scheduling for allocating radio resources for each of
the plurality of mobile terminals is required. In particular, for a
downlink control channel transmission, control information for the
plurality of mobile terminals may be transmitted together. Thus,
scheduling for allocating radio resources for the control
information transmission is also required. Therefore, such
scheduling information is also transmitted.
Among the plurality of OFDM symbols included in the subframe, the
number of OFDM symbols used in transmitting the control information
and/or the scheduling information may be varied per subframe
according to a communication environment, the amount of control
channel information, and the amount of scheduling information, etc.
Thus, such information should be informed to a receiver. If errors
occur in receiving the control information and the scheduling
information, it is quite probable that errors occur in receiving
the data of the corresponding subframe. Accordingly, what is needed
is a system that overcomes the deficiencies of the prior art, such
that control information and scheduling information can be decoded
with a high success rate.
SUMMARY OF THE INVENTION
The present invention is directed to a method for receiving control
information in an orthogonal frequency division multiplexing system
of a mobile communication system.
Additional features and advantages of the invention will be set
forth in the description which follows, and in part will be
apparent from the description, or may be learned by practice of the
invention. The objectives and other advantages of the invention
will be realized and attained by the structure particularly pointed
out in the written description and claims hereof as well as the
appended drawings.
To achieve these and other advantages and in accordance with the
purpose of the present invention, as embodied and broadly
described, the present invention is embodied in a method for
receiving control information in an orthogonal frequency division
multiplexing (OFDM) system of a mobile communication system, the
method comprising receiving information related to a number of OFDM
symbols in a subframe for receiving first control information,
receiving information related to a number of OFDM symbols in the
subframe for receiving second control information, decoding the
first control information according to the received information
related to the number of OFDM symbols in the subframe for receiving
the first control information, and decoding the second control
information according to the received information related to the
number of OFDM symbols in the subframe for receiving the second
control information, wherein the number of OFDM symbols for
receiving the first control information is less than or equal to
the number of OFDM symbols for receiving the second control
information.
Preferably, the second control information is not decoded if the
number of OFDM symbols for receiving the first control information
is greater than the number of OFDM symbols for receiving the second
control information.
In one aspect of the invention, the method further comprises
decoding the second control information using all possible numbers
of OFDM symbols in the subframe for receiving the second control
information if the number of OFDM symbols for receiving the first
control information is greater than the number of OFDM symbols for
receiving the second control information. In another aspect of the
invention, the method further comprises decoding the second control
information using all possible numbers of OFDM symbols in the
subframe for receiving the second control information greater than
or equal to the number of OFDM symbols for receiving the first
control information if the number of OFDM symbols for receiving the
first control information is greater than the number of OFDM
symbols for receiving the second control information.
Preferably, the first control information comprises an ACK/NACK
signal and the second control information comprises a physical
downlink control channel. Preferably, the information related to
the number of OFDM symbols in the subframe for receiving the first
control information is received via a broadcast channel.
Preferably, the information related to the number of OFDM symbols
in the subframe for receiving the second control information is
received via a physical control channel format indicator channel.
Preferably, the number of OFDM symbols in the subframe for
receiving the second control information is 1, 2 or 3.
In accordance with another embodiment of the present invention, a
method for transmitting control information in an orthogonal
frequency division multiplexing (OFDM) system of a mobile
communication system comprises transmitting information related to
a number of OFDM symbols in a subframe for transmitting first
control information, transmitting information related to a number
of OFDM symbols in the subframe for transmitting second control
information, transmitting the first control information according
to the transmitted information related to the number of OFDM
symbols in the subframe for transmitting the first control
information, and transmitting the second control information
according to the transmitted information related to the number of
OFDM symbols in the subframe for transmitting the second control
information, wherein the number of OFDM symbols for transmitting
the first control information is less than or equal to the number
of OFDM symbols for transmitting the second control
information.
Preferably, the first control information comprises an ACK/NACK
signal and the second control information comprises a physical
downlink control channel.
Preferably, the information related to the number of OFDM symbols
in the subframe for transmitting the first control information is
transmitted via a broadcast channel. Preferably, the information
related to the number of OFDM symbols in the subframe for
transmitting the second control information is transmitted via a
physical control channel format indicator channel. Preferably, the
number of OFDM symbols for transmitting the second control
information is 1, 2 or 3.
It is to be understood that both the foregoing general description
and the following detailed description of the present invention are
exemplary and explanatory and are intended to provide further
explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and
constitute a part of this specification, illustrate embodiments of
the invention and together with the description serve to explain
the principles of the invention. Features, elements, and aspects of
the invention that are referenced by the same numerals in different
figures represent the same, equivalent, or similar features,
elements, or aspects in accordance with one or more
embodiments.
FIG. 1 is a diagram relatively comparing a varying period of the
number of OFDM symbols through which an ACK/NAK channel is
transmitted (m) with a varying period of the number of OFDM symbols
for control channel transmission (n) in accordance with one
embodiment of the present invention.
FIG. 2 is a diagram illustrating one example of a method for
allocating the transmission of OFDM symbols of a control channel
and an ACK/NAK channel in an orthogonal frequency division
multiplexing (OFDM) system in accordance with one embodiment of the
present invention.
FIG. 3 is a flow chart illustrating one example of a method for
transmitting information on the number of OFDM symbols for control
channel transmission (n) and a control channel from a base station
in accordance with one embodiment of the present invention.
FIG. 4 is a flow chart illustrating one example of a method for
receiving information on the number of OFDM symbols for control
channel transmission (n) and a control channel in a mobile terminal
in accordance with one embodiment of the present invention.
FIG. 5 illustrates a block diagram of a mobile terminal in
accordance with the present invention.
FIG. 6 is a diagram explaining an example of a method for receiving
information of OFDM symbols of a downlink control channel in an
orthogonal frequency division multiplexing (OFDM) system in
accordance with one embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention relates to receiving control information in
OFDM system of a mobile communication system.
Hereinafter, the present invention will be described in more detail
with reference to the accompanying drawings. The detailed
description described below with reference to the accompanying
drawings intends to explain exemplary embodiments rather than a
sole embodiment where the present invention can be carried out. The
detailed description described below includes specific details for
assisting in a complete understanding of the present invention.
However, those skilled in the art may appreciate that the present
invention can be carried out without such specific details of the
present invention. For example, although the detailed description
described below is explained centering on certain terms, it is not
necessarily limited to the terms but the same meanings can be
represented thereby even in the case where it is explained by
optional terms.
In some cases, the present invention may omit a publicly known
structure or apparatus in order to avoid obscurity of the present
invention, and the present invention may be presented via a block
view and/or a flow chart centering on the core function of each
structure and/or apparatus. Also, like reference numerals refer to
like elements throughout the specification.
The below embodiments are the embodiments in which the constituents
of the present invention and the properties are coupled to each
other in a predetermined shape. Each constituent or property should
be selectively considered so far as there are not any specific
mentions thereof. Each constituent or property may be carried out
in a shape that they are not coupled to another constituent or
property. Also, the embodiments of the present invention may be
configured by combining some constituents and/or properties. The
order of the operations explained in the embodiments of the present
invention may be changed. Some constitution or property of any
embodiment may be included in another embodiment, or may be
replaced by the constitution or property corresponding to another
embodiment.
The embodiments of the present invention are explained centering on
a data transmitting/receiving relationship between a base station
and a mobile terminal. Herein, the base station is a terminal node
of a network directly performing a communication with the mobile
terminal. The specific operation explained to be performed by the
base station may be performed by an upper node of the base station
according to circumstances. In other words, various operations
performed for communication with the mobile terminal in a network
configured of a plurality of network nodes including the base
station may be performed by the base station or another network
node other than the base station. The "base station" may be
replaced by terms, such as fixed station, Node B, enode B, eNB, and
access point, for example. Also, the "mobile terminal" may be
replaced by terms, such as User Equipment (UE), Mobile Station
(MS), and Mobile Subscriber Station (MSS), for example.
When transmitting packet data in a mobile communication system, a
receiving side may notify a transmitting side whether or not the
receiving side has received a packet successfully. For example,
when packet reception is successful, the receiving side may
transmit an ACK signal to inform the transmitting side of the
successful reception, therefore allowing the transmitting side to
transmit a new packet. When packet reception fails, the receiving
side may transmit a NAK signal to the transmitting side to inform
the transmitting side of the failed reception. Accordingly, the
transmitting side may retransmit the packet to the receiving
side.
The operation described above may be referred to as an automatic
repeat request (ARQ) operation. An expansion of the ARQ operation
may be referred to as a Hybrid ARQ (HARQ) operation, which is
capable of raising the efficiency of an entire system. The HARQ
operation lowers error probability by combining a retransmission
packet with an original packet, and by being coupled with a channel
coding scheme. In order to improve performance by applying the HARQ
scheme, the HARQ prefers prompt ACK/NAK responses from a receiver
as compared to the previous ARQ operation. Therefore, in the HARQ,
the ACK/NAK signal may be transmitted in a physical channel
signaling manner.
Preferably, downlink ACK/NAK signals, which are a response to data
transmitted in the uplink, may be transmitted through "m" number of
OFDM symbols of each subframe. Furthermore, it is preferable that
the ACK/NAK signals be transmitted through a part of resource
elements within the "m" number of OFDM symbols rather than the
entire "m" number of OFDM symbols. Herein, for example, the "m"
value is a value that may vary according to a degree of cell
coverage. Hereinafter, a method for transmitting an ACK/NAK channel
through which the ACK/NAK signals are transmitted, and a method for
determining OFDM symbols for control channel transmission, will be
described in more detail.
FIG. 1 is a diagram relatively comparing a varying period of the
number of OFDM symbols through which ACK/NAK channels are
transmitted (m) with a varying period of the number of OFDM symbols
for control channel transmission (n) in accordance with one
embodiment of the present invention. Hereinafter, the embodiments
of the present invention will be described for a case where first n
OFDM symbols among OFDM symbols in one subframe of a downlink
transmission time interval (TTI) unit of an OFDM system (e.g., a
3GPP LTE OFDM radio communication system) are used for transmitting
uplink/downlink scheduling signals and other control signals.
In accordance with the present invention, "n" represents the number
of OFDM symbols used for control channel transmission. A maximum
number of OFDM symbols for control channel transmission is denoted
by the value "N". The "n" value may vary per subframe according to
the amount of uplink/downlink control signals and/or the amount of
scheduling signals to be transmitted to the uplink. For example, if
N=3, then n may be determined by a natural number less than or
equal to 3 (n.ltoreq.N, where N=3).
As described above, because the "n" value may vary per subframe,
the base station transmits a control channel format indicator
(CCFI) indicating information associated with the "n" value through
a physical control channel format indicator channel (PCFICH) to
inform the mobile terminals of the "n" value in each subframe. For
example, the CCFI may be transmitted through a first OFDM symbol of
the subframe.
As described above, the "m" value, which is the number of OFDM
symbols through which the ACK/NAK channel is transmitted, may also
vary. However, the number of OFDM symbols through which the ACK/NAK
is transmitted on the downlink may be controlled by cell coverage.
Therefore, it is not necessary for the "m" to frequently change for
each cell. Moreover, if the number of OFDM symbols through which
the ACK/NAK is transmitted varies per subframe similar to the
number of OFDM symbols for control channel transmission, it may be
difficult to relate the uplink data transmission of each mobile
terminal with the ACK/NAK channels through which the ACK/NAK
signals of the data are transmitted.
Therefore, in accordance with the present invention, it is
preferable that the number of OFDM symbols through which the
ACK/NAK channel is transmitted (m) vary over a larger period than a
period that the number of OFDM symbols for control channel
transmission (n) varies independently from the number of ACK/NAK
signals actually transmitted in an optional subframe. In other
words, as shown in FIG. 1, it is preferable to set the number of
OFDM symbols through which the ACK/NAK channel is transmitted (m)
to be relatively semi-static as compared to the number of OFDM
symbols for control channel transmission (n) that can be variously
set per subframe.
Preferably, in order for the mobile terminals to receive the
ACK/NAK signals, an allocation structure of the ACK/NAK channels
should be known so that the base station may notify the mobile
terminals of the "m" value through an upper layer RRC message or a
broadcast channel with a slower period than the "n" value.
Differently therefrom, the "n" value may be transmitted per
subframe through the CCFI as described above.
FIG. 2 is a diagram illustrating one example of a method for
allocating the transmission of OFDM symbols of a control channel
and ACK/NAK channels in an orthogonal frequency division
multiplexing (OFDM) system in accordance with one embodiment of the
present invention.
In accordance with the present invention, a number of OFDM symbols
through which the ACK/NAK channel is transmitted (m) is set as a
minimum value within a varying range of the number of OFDM symbols
for control channel transmission (n) that may vary per subframe.
Preferably, the number "m" of OFDM symbols varies semi-statically.
Accordingly, the number of OFDM symbols for control channel
transmission (n) may be selected among values within a range from
the number of OFDM symbols through which the ACK/NAK channel is
transmitted (m) to the maximum number of OFDM symbols for control
channel transmission (N). This relationship is represented by
Equation (1). m.ltoreq.n.ltoreq.N (1)
In Equation (1), "m" represents the number of OFDM symbols through
which the ACK/NAK channel is transmitted, "n" represents the number
of OFDM symbols for control channel transmission, and "N"
represents the maximum number of OFDM symbols for control channel
transmission. Here, the ACK/NAK channel is allocated to first m
OFDM symbols. Moreover, like the "N" value, a maximum number of
OFDM symbols through which the ACK/NAK channel is transmitted (M)
may be previously determined. Accordingly, the "m" value may be
within a range from 0 to M. Preferably, the "M" value is less than
or equal to the "N" value.
If the "n" value varies per subframe using the above-described
method, and although the amount of time/frequency resources within
the "n" number of OFDM symbols capable of being allocated to the
ACK/NAK channel in one subframe also varies, the number of OFDM
symbols for control channel transmission may be varied within a
limited range per subframe while a structure of the ACK/NAK channel
is semi-statically fixed in accordance with one embodiment of the
present invention. Examples of the varying range of the "n" value
according to the "M" value will be described with reference to FIG.
2.
FIG. 2(a) is a diagram illustrating an example that the number of
OFDM symbols through which the ACK/NAK channel is transmitted (m)
is 1. In the example that m=1, the ACK/NAK channel is transmitted
through predetermined resource elements within a first OFDM symbol
of each subframe, and the "n" value may vary within a range from 1
to 3 per subframe.
FIG. 2(b) is a diagram illustrating an example that the number of
OFDM symbols through which the ACK/NAK channel is transmitted (m)
is 2. In the example that m=2, the ACK/NAK channel is transmitted
through predetermined resource elements within first and second
OFDM symbols of each subframe, and the "n" value may vary within a
range from 2 to 3 per subframe.
FIG. 2(c) is a diagram illustrating an example that the number of
OFDM symbols through which the ACK/NAK channel is transmitted (m)
is 3. In the example that m=3, the ACK/NAK channel is transmitted
through predetermined resource elements within first, second and
third OFDM symbols of each subframe. In this particular case, the
"n" value is fixed at 3.
Through the above described method, the number of OFDM symbols for
control channel transmission may be varied within a limited range
per subframe while a structure of the ACK/NAK channel is
semi-statically fixed, wherein control signals are transmitted on
the control channel. Also, if the ACK/NAK channel transmission is
performed using the OFDM symbols for control channel transmission
as above, downlink data transmitted through OFDM symbols other than
the OFDM symbols for control channel transmission and ACK/NAK
signals are multiplexed to be transmitted in each subframe.
Accordingly, complication in setting data transmission power is
prevented.
FIG. 3 is a flow chart illustrating one example of a method for
transmitting information on the number of OFDM symbols for control
channel transmission (n) and a control channel from a base station
in accordance with one embodiment of the present invention.
Initially, a base station may determine the number of OFDM symbols
for control channel transmission (n) within a range of minimizing
the number of OFDM symbols through which the ACK/NAK channel is
transmitted (m) by considering the number of OFDM symbols through
which a predetermined ACK/NAK channel is transmitted (S10). Here,
the "n" value is preferably less than or equal to the maximum
number of OFDM symbols for control channel transmission (N), as
described above.
Thereafter, the base station may transmit, to at least one mobile
terminal, information regarding the determined number of OFDM
symbols for control channel transmission (n) (S11). Finally, the
relevant control channel may be transmitted to the at least one
mobile terminal (S12).
Particularly, when the ACK/NAK channel is allocated to be
transmitted through the maximum number of OFDM symbols for control
channel transmission (N) that can be used in transmitting
scheduling signals (N=M and m=M), as explained with reference to
FIG. 2(c), the "n" value cannot have a value other than n=N. Thus,
the "n" value may not be broadcast through the CCFI per subframe.
Accordingly, the time/frequency resources reserved for CCFI
transmission may not be used for CCFI transmission, but may have
other uses. Preferably, the time/frequency resources may be
extensively used for control signal transmission including the
scheduling signals or the ACK/NAK signals.
In the above descriptions, an "n" value and an "m" value do not
always exist in a unit of 1 within n.ltoreq.N and m.ltoreq.N,
respectively. Rather, the values may be selected from a specific
natural number set existing within n.ltoreq.N and m.ltoreq.N.
Herein, the specific natural number set may include 0.
FIG. 4 is a flow chart illustrating one example of a method for
receiving information on the number of OFDM symbols for control
channel transmission (n) and a control channel in a mobile terminal
in accordance with one embodiment of the present invention.
In the present embodiment, the number of OFDM symbols through which
the ACK/NAK channel is transmitted (m) is a value that can be
semi-statically varied as described above. Preferably, a mobile
terminal previously acquires information regarding the number of
OFDM symbols through which the ACK/NAK channel is transmitted (m)
through an upper layer RRC message or other broadcasting channel
before receiving and decoding a corresponding subframe(s).
In accordance with the present invention, the mobile terminal
receives CCFI, which is information regarding the number of OFDM
symbols for control channel transmission (n), through PCFICH. Here,
the number of OFDM symbols for control channel transmission (n) may
be varied within a range of minimizing the number of OFDM symbols
through which the ACK/NAK channel is transmitted (m) according to
one embodiment of the present invention. Preferably, the mobile
terminal decodes the received number of OFDM symbols for control
channel transmission (n) by obtaining correlation values using
expected "n" values that can be the number of OFDM symbols for
control channel transmission, etc.
As stated above, the mobile terminal may assume the expected "n"
values based on the "m" value previously informed to the mobile
terminal according to the present embodiment. Thus, when decoding
the "n" value, the mobile terminal may decode the CCFI assuming
that the "n" value is within the range of m.ltoreq.n.ltoreq.N so
that the CCFI decoding outputs the "n" value within the range
(S20).
After obtaining the "n" value by the above procedure, a mobile
terminal may decode the second control channels assuming the
control channels are transmitted through "n" OFDM symbols
(S30).
In another aspect of the invention, the mobile terminal may decode
the CCFI to obtain the "n" value without considering the expected
range of m.ltoreq.n.ltoreq.N. Therefore, the mobile terminal may
obtain the "n" value which is out of the valid range of
m.ltoreq.n.ltoreq.N. In this case, the mobile terminal may try to
decode control channels for all possible "n" values, or for every
possible "n" value within the range of m.ltoreq.n.ltoreq.N.
Otherwise, in another example, when the "n" value obtained deviates
from the range m.ltoreq.n.ltoreq.N, then decoding CCFI is
considered to have failed for the particular "n" value. If so, an
operation corresponding thereto may be abandoned. For example, the
mobile terminal may abandon receiving scheduling signals in the
subframe if the "n" value does not satisfy m.ltoreq.n.ltoreq.N.
Particularly, as explained with reference to FIG. 2(c), when the
already known "m" is equal to the maximum number of OFDM symbols
for control channel transmission (N), such that m=N, then the base
station does not transmit the CCFI, or the mobile terminal does not
decode the CCFI even though the base station transmits the CCFI
because the mobile terminal assumes that n=N. Therefore, the mobile
terminal may operate assuming that the scheduling signals and other
control signals are transmitted through the first N OFDM
symbols.
Alternatively, if the already known "m" is equal to the maximum
number of OFDM symbols for control channel transmission (N), such
that m=N, and if the base station transmits the CCFI, the mobile
terminal will decode the CCFI. However, the mobile terminal will
assume that n=N regardless of the decoding results. Accordingly,
the mobile terminal may also operate assuming that the scheduling
signals and other control signals are transmitted through the first
N OFDM symbols.
FIG. 5 illustrates a block diagram of a mobile station (MS) or UE 1
in accordance with the present invention. The UE 1 includes a
processor (or digital signal processor) 210, RF module 235, power
management module 205, antenna 240, battery 255, display 215,
keypad 220, memory 230, speaker 245 and microphone 250.
A user enters instructional information, such as a telephone
number, for example, by pushing the buttons of a keypad 220 or by
voice activation using the microphone 250. The microprocessor 210
receives and processes the instructional information to perform the
appropriate function, such as to dial the telephone number.
Operational data may be retrieved from the memory module 230 to
perform the function. Furthermore, the processor 210 may display
the instructional and operational information on the display 215
for the user's reference and convenience.
The processor 210 issues instructional information to the RF module
235, to initiate communication, for example, transmits radio
signals comprising voice communication data. The RF module 235
comprises a receiver and a transmitter to receive and transmit
radio signals. An antenna 240 facilitates the transmission and
reception of radio signals. Upon receiving radio signals, the RF
module 235 may forward and convert the signals to baseband
frequency for processing by the processor 210. The processed
signals would be transformed into audible or readable information
outputted via the speaker 245, for example. The processor 210 also
includes the protocols and functions necessary to perform the
various processes described herein.
FIG. 6 is a diagram explaining an example of a method for receiving
information of orthogonal frequency division multiplexing (OFDM)
symbols of a downlink control channel in an OFDM system in
accordance with one embodiment of the present invention. Referring
to FIG. 6, a mobile terminal receives information about number m of
first OFDM symbols which is used for transmission of a channel,
wherein the channel carries a hybrid automatic repeat request
(HARQ) ACK/NACK (S61). The mobile terminal receives information
about number n of second OFDM symbols which is used for
transmission of the downlink control channel (S62). In this
example, the number n is equal to or greater than the number m
(n.gtoreq.m) and a transmission interval of the information about
the number m is greater than a transmission interval of the
information about the number n.
It is obvious that embodiments can be configured by combining the
claims not having clear citation relations in the claims or new
claims may be included in the claims by means of amendments after
filing an application.
The embodiments according to the present invention can be
implemented by various means, for example, hardware, firmware,
software, or a combination thereof, etc. When implemented by the
hardware, a method for receiving a control channel according to one
embodiment of the present invention can be implemented by one or
more application specific integrated circuits (ASICs), digital
signal processors (DSPs), digital signal processing devices
(DSPDs), programmable logic devices (PLDs), field programmable gate
arrays (FPGAs), processors, controllers, micro controllers, micro
processors, etc.
When implemented by the firmware or the software, a method for
receiving a control channel according to one embodiment of the
present invention can be implemented in the shapes of modules,
processes, and functions, etc. performing the functions or the
operations explained as above. Software codes are stored in a
memory unit, making it possible to be driven by a processor. The
memory unit is positioned inside or outside the processor, making
it possible to exchange data with the processor by means of various
means already publicly known.
Although a few embodiments of the present invention have been shown
and described, it would be appreciated by those skilled in the art
that changes might be made in this embodiment without departing
from the principles and spirit of the invention, the scope of which
is defined in the claims and their equivalents.
The foregoing embodiments and advantages are merely exemplary and
are not to be construed as limiting the present invention. The
present teaching can be readily applied to other types of
apparatuses. The description of the present invention is intended
to be illustrative, and not to limit the scope of the claims. Many
alternatives, modifications, and variations will be apparent to
those skilled in the art. In the claims, means-plus-function
clauses are intended to cover the structure described herein as
performing the recited function and not only structural equivalents
but also equivalent structures.
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