U.S. patent number 9,271,162 [Application Number 13/817,265] was granted by the patent office on 2016-02-23 for mobile communication method and mobile station.
This patent grant is currently assigned to NTT DOCOMO, INC.. The grantee listed for this patent is Wuri Andarmawanti Hapsari, Mikio Iwamura. Invention is credited to Wuri Andarmawanti Hapsari, Mikio Iwamura.
United States Patent |
9,271,162 |
Hapsari , et al. |
February 23, 2016 |
Mobile communication method and mobile station
Abstract
A mobile communication method according to the present invention
includes a step A of generating and storing, by a mobile station UE
in a standby state, a MDT log including predetermined information
in a period defined by a "Logged MDT measurement period", a step B
of generating and storing, by the mobile station UE, the MDT log
when a standby cell is changed, and a step C of transmitting, by
the mobile station UE, the stored MDT log to a radio base station
eNB after the mobile station UE is changed to an active state.
Inventors: |
Hapsari; Wuri Andarmawanti
(Tokyo, JP), Iwamura; Mikio (Tokyo, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
Hapsari; Wuri Andarmawanti
Iwamura; Mikio |
Tokyo
Tokyo |
N/A
N/A |
JP
JP |
|
|
Assignee: |
NTT DOCOMO, INC. (Tokyo,
JP)
|
Family
ID: |
45605157 |
Appl.
No.: |
13/817,265 |
Filed: |
August 12, 2011 |
PCT
Filed: |
August 12, 2011 |
PCT No.: |
PCT/JP2011/068420 |
371(c)(1),(2),(4) Date: |
April 19, 2013 |
PCT
Pub. No.: |
WO2012/023503 |
PCT
Pub. Date: |
February 23, 2012 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
|
US 20130203456 A1 |
Aug 8, 2013 |
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Foreign Application Priority Data
|
|
|
|
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Aug 16, 2010 [JP] |
|
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2010-181883 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W
24/10 (20130101); H04W 24/00 (20130101); H04W
48/20 (20130101) |
Current International
Class: |
H04W
36/00 (20090101); H04W 24/00 (20090101); H04W
24/10 (20090101); H04W 48/20 (20090101) |
Field of
Search: |
;455/436-445 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Japanese Office Action in corresponding Japanese Patent Application
No. 2010-181883 dated Jan. 22, 2013, with translation (5 pages).
cited by applicant .
International Preliminary Report on Patentability issued in
PCT/JP2011/068420 dated Mar. 19, 2013 (5 pages). cited by applicant
.
Written Opinion of the International Searching Authority issued in
PCT/JP2011/068420 dated Sep. 6, 2011 (4 pages). cited by applicant
.
International Search Report issued in PCT/JP2011/068420 mailed Sep.
6, 2011 (3 pages). cited by applicant .
Samsung; "MDT configuration for logging in idle mode"; 3GPP TSG RAN
WG2 #69, R2-101141; San Francisco, USA; Feb. 22-26, 2010 (2 pages).
cited by applicant .
NEC; "Logged MDT measurement resuming after IRAT HO/cell"; 3GPP TSG
RAN2 Meeting #69bis, R2-102231; Beijing, China; Apr. 12-16, 2010 (3
pages). cited by applicant .
3GPP TR 36.805 V9.0.0; "3rd Generation Partnership Project;
Technical Specification Group Radio Access Network; Study on
Minimization of drive-tests in Next Generation Networks; (Release
9)"; Dec. 2009 (24 pages). cited by applicant .
3GPP TS 37.320 V1.0.0; "3rd Generation Partnership Project;
Technical Specification Group TSG RAN Universal Terrestrial Radio
Access (UTRA) and Evolved Universal Terrestrial Radio Access
(E-UTRA); Radio measurement collection for Minimization of Drive
Tests (MDT); Overall description; Stage 2 (Release 10)"; Aug. 2010
(15 pages). cited by applicant.
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Primary Examiner: Rego; Dominic E
Attorney, Agent or Firm: Osha Liang LLP
Claims
The invention claimed is:
1. A mobile communication method comprising: a step A of generating
and storing, by a mobile station in a standby state, log
information including predetermined information in a predetermined
period; a step B of generating and storing, by the mobile station,
the log information when a standby cell is changed; and a step C of
transmitting, by the mobile station, the stored log information to
a radio base station after the mobile station is changed to an
active state.
2. The mobile communication method according to claim 1, wherein,
in the step B, the mobile station generates and stores, as the
predetermined information, the log information including at least
one of identification information of a changed standby cell, radio
quality in the changed standby cell, time information, and location
information.
3. The mobile communication method according to claim 1, wherein,
after a time point at which a changed standby cell is initially
selected, the mobile station generates and stores the log
information in the predetermined period.
4. A mobile station comprising: a management unit that generates
and stores log information including predetermined information in a
predetermined period when the mobile station is in a standby state;
and a transmission unit that transmits the stored log information
to a radio base station after the mobile station is changed to an
active state, wherein when the mobile station changes a standby
cell, the management unit is configured to generate and store the
log information.
5. The mobile station according to claim 4, wherein the management
unit is configured to generate and store, as the predetermined
information, the log information including at least one of
identification information of a changed standby cell, radio quality
in the changed standby cell, time information, and location
information.
6. The mobile station according to claim 4, wherein, after a time
point at which a changed standby cell is initially selected, the
management unit is configured to generate and store the log
information, in the predetermined period.
Description
TECHNICAL FIELD
The present invention relates to a mobile communication method and
a mobile station.
BACKGROUND ART
In an LTE (Long Term Evolution) scheme, "MDT (Minimisation of Drive
Tests)" is defined.
According to the MDT, in "Logged MDT", a mobile station UE is
configured to measure "Periodic DL Pilot Strength" in a period
defined by a "Logged MDT measurement period", and generate and
store a MDT log including a result of the measurement.
CITATION LIST
Non Patent Literature
[NPL 1] 3GPP TR36.805 [NPL 2] 3GPP TS37.320
SUMMARY OF INVENTION
Technical Problem
However, in the conventional "Logged MDT", there is a problem that
it is not sufficient to realize "Coverage Optimisation" only
through the "Periodic DL Pilot Strength" measured by the mobile
station UE.
Therefore, the present invention has been achieved in view of the
above-described problems, and an object thereof is to provide a
mobile communication method and a mobile station, by which it is
possible to acquire information required for realizing "Coverage
Optimisation" in "Logged MDT".
Solution to Problem
A first characteristic of the present embodiment is summarized in
that a mobile communication method includes: a step A of generating
and storing, by a mobile station in a standby state, log
information including predetermined information in a predetermined
period; a step B of generating and storing, by the mobile station,
the log information when a standby cell is changed; and a step C of
transmitting, by the mobile station, the stored log information to
a radio base station after the mobile station is changed to an
active state.
A second characteristic of the present embodiment is summarized in
that a mobile station includes: a management unit that generates
and stores log information including predetermined information in a
predetermined period when the mobile station is in a standby state;
and a transmission unit that transmits the stored log information
to a radio base station after the mobile station is changed to an
active state, wherein, when the mobile station changes a standby
cell, the management unit is configured to generate and store the
log information.
Advantageous Effects of Invention
As described above, according to the present invention, it is
possible to provide a mobile communication method and a mobile
station, by which it is possible to acquire information required
for realizing "Coverage Optimisation" in "Logged MDT".
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a diagram illustrating the entire configuration of a
mobile communication system according to a first embodiment of the
present invention.
FIG. 2 is a functional block diagram of a mobile station according
to the first embodiment of the present invention.
FIG. 3 is a diagram for explaining the operation of the mobile
communication system according to the first embodiment of the
present invention.
DESCRIPTION OF EMBODIMENTS
(Mobile Communication System According to First Embodiment of the
Present Invention)
With reference to FIG. 1 to FIG. 3, a mobile communication system
according to a first embodiment of the present invention will be
described.
As illustrated in FIG. 1, the mobile communication system according
to the present embodiment is an LTE mobile communication system,
and includes a radio base station eNB#1 configured to manage a cell
#1 and a radio base station eNB#2 configured to manage a cell
#2.
A mobile station UE according to the present embodiment is able to
cope with "Logged MDT", and includes a cell reselection unit 11, an
acquisition unit 12, an MDT log management unit 13, and a
transmission unit 14 as illustrated in FIG. 2.
The cell reselection unit 11 is configured to perform cell
reselection and change a standby cell when a predetermined
condition is satisfied.
The acquisition unit 12 is configured to acquire predetermined
information required for generating a MDT log.
For example, the acquisition unit 12 is configured to acquire, as
the predetermined information, "RSRP (Reference signal Received
Power)" and "RSRQ (Reference signal Received Quality)", which are
radio quality in a predetermined cell, "Time Stamp", "Location
Information" and the like.
Furthermore, the acquisition unit 12 may be configured to acquire
radio quality in a cell (a frequency), which is designated by a
radio base station eNB based on "MDT Configuration", as the radio
quality in the predetermined cell.
In addition, the acquisition unit 12 may be configured to acquire
the "Location Information" and the radio quality in the
predetermined cell at different timings.
Furthermore, when the standby cell is changed by the cell
reselection unit 11, the acquisition unit 12 is configured to
acquire, as the predetermined information, "E-CGI (E-UTRAN Cell
Global Identifier)" and "PCI (Physical Cell Identity)", which are
identification information of a changed standby cell, radio quality
(RSRP, RSRQ and the like) in the changed standby cell, and the
like.
When the mobile station UE is in a standby state (an RRC-Idle
state), the MDT log management unit 13 is configured to generate
and store a MDT log including the predetermined information
acquired by the acquisition unit 12, in a period defined by a
"Logged MDT measurement period".
Furthermore, when the mobile station UE performed the cell
reselection, that is, when the standby cell is changed by the cell
reselection unit 11, the MDT log management unit 13 is configured
to generate and store the MDT log including the predetermined
information acquired by the acquisition unit 12.
In such a case, after the time point at which the changed standby
cell is initially selected, the MDT log management unit 13 might be
configured to generate and store the MDT log in the period defined
by the "Logged MDT measurement period".
The transmission unit 14 is configured to transmit the MDT log
stored in the MDT log management unit 13 to a radio base station
eNB after the mobile station UE is changed to an active state (an
RRC_Connected state).
Furthermore, the transmission unit 14 is configured to transmit the
MDT log stored in the MDT log management unit 13 at the request of
a radio base station eNB that manages a cell in which the mobile
station UE is changed to the active state.
Hereinafter, with reference to FIG. 3, an example of the operation
of the mobile communication system according to the first
embodiment of the present invention will be described.
When the cell #1 is set as a standby cell, the mobile station UE
acquires the aforementioned predetermined information at time
points t1, t2, t3, and t4 (in an example of FIG. 3) in the period
defined by the "Logged MDT measurement period", and generates and
stores the aforementioned MDT log.
For example, at the time points t1, t2, t3, and t4, the mobile
station UE generates and stores a MDT log including radio quality
in the cell #1, "Time Stamp", and "Location Information".
Furthermore, at the time t11, the mobile station UE performs cell
reselection to change a standby cell from the cell #1 to the cell
#2, and generates and stores a MDT log including "E-CGI" and "PCI"
of the cell #2, radio quality in the cell #2, "Time Stamp", and
"Location Information".
Then, after the time point t11 at which the cell #2 (the changed
standby cell) is initially selected, the mobile station UE
generates and stores a MDT log in the period defined by the "Logged
MDT measurement period". Furthermore, at the time t11, the mobile
station UE may generate and store the MDT log, or may not generate
and store the MDT log.
That is, instead of generating and storing the MDT log at times t5,
t6, and t7, the mobile station UE may generate and store the MDT
log at times t12, t13, and t14.
In accordance with the mobile communication system according to the
first embodiment of the present invention, in the "Logged MDT", in
addition to a MDT log including "Periodic DL Pilot Strength", since
the mobile station UE is configured to generate and store a MDT log
including "E-CGI" and "PCI" of a changed standby cell, radio
quality in the changed standby cell, "Time Stamp", and "Location
Information" when the standby cell is changed, a communication
provider is able to collect information required for realizing
"Coverage Optimisation" in the "Logged MDT".
The characteristics of the present embodiment as described above
may be expressed as follows.
A first characteristic of the present embodiment is summarized in
that a mobile communication method includes: a step A of generating
and storing, by a mobile station UE in a standby state, a MDT log
(log information) including predetermined information in a period
(a predetermined period) defined by a "Logged MDT measurement
period"; a step B of generating and storing, by the mobile station
UE, the MDT log when a standby cell is changed; and a step C of
transmitting, by the mobile station UE, the stored MDT log to a
radio base station eNB after the mobile station UE is changed to an
active state.
In the first characteristic of the present embodiment, in the step
B, the mobile station UE may generate and store, as the
predetermined information, the log information including at least
one of identification information (E-CGI, PCI and the like) of a
changed standby cell, radio quality (RSRP, RSRQ and the like) in
the changed standby cell, "Time Stamp (time information)", and
"Location Information (location information)".
In the first characteristic of the present embodiment, after the
time point at which the changed standby cell is initially selected,
the mobile station UE may generate and store the MDT log in the
period defined by the "Logged MDT measurement period".
A second characteristic of the present embodiment is summarized in
that a mobile station UE includes: a MDT log management unit 13
configured to generate and store a MDT log including predetermined
information in a period defined by a "Logged MDT measurement
period" when the mobile station UE is in a standby state; and a
transmission unit 14 configured to transmit the stored MDT log to a
radio base station eNB after the mobile station UE is changed to an
active state, wherein when the mobile station UE changed a standby
cell (performed cell reselection), the MDT log management unit 13
is configured to generate and store the MDT log.
In the second characteristic of the present embodiment, the MDT log
management unit 13 may be configured to generate and store, as the
predetermined information, the MDT log including at least one of
identification information (E-CGI, PCI and the like) of a changed
standby cell, radio quality (RSRP, RSRQ and the like) in the
changed standby cell, "Time Stamp", and "Location Information".
In the second characteristic of the present embodiment, after the
time point at which the changed standby cell is initially selected,
the MDT log management unit 13 may be configured to generate and
store the MDT log in the period defined by the "Logged MDT
measurement period".
In addition, the operation of the above-mentioned radio base
station eNB or mobile station UE may be implemented by hardware,
may also be implemented by a software module executed by a
processor, or may further be implemented by the combination of the
both.
The software module may be arranged in a storage medium of an
arbitrary format such as a RAM (Random Access Memory), a flash
memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable
ROM), an EEPROM (Electronically Erasable and Programmable ROM), a
register, a hard disk, a removable disk, or a CD-ROM.
The storage medium is connected to the processor so that the
processor can write and read information into and from the storage
medium. Such a storage medium may also be accumulated in the
processor. Such storage medium and processor may be arranged in an
ASIC. Such an ASIC may be arranged in the radio base station eNB or
the mobile station UE. As a discrete component, such storage medium
and processor may be arranged in the radio base station eNB or the
mobile station UE.
Thus, the present invention has been explained in detail by using
the above-mentioned embodiments; however, it is obvious that for
persons skilled in the art, the present invention is not limited to
the embodiments explained herein. The present invention can be
implemented as a corrected and modified mode without departing the
gist and the scope of the present invention defined by the claims.
Therefore, the description of the specification is intended for
explaining the example only and does not impose any limited meaning
to the present invention.
REFERENCE SIGNS LIST
UE . . . Mobile station eNB . . . Radio base station 11 . . . Cell
reselection unit 12 . . . Acquisition unit 13 . . . MDT log
management unit 14 . . . Transmission unit
* * * * *