CN103582001B - Minimize the method for returning of drive test metric data - Google Patents
Minimize the method for returning of drive test metric data Download PDFInfo
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- CN103582001B CN103582001B CN201310349615.0A CN201310349615A CN103582001B CN 103582001 B CN103582001 B CN 103582001B CN 201310349615 A CN201310349615 A CN 201310349615A CN 103582001 B CN103582001 B CN 103582001B
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- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000000151 deposition Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 10
- 238000010295 mobile communication Methods 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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Abstract
The present invention proposes a kind of method for returning for minimizing drive test metric data, and the method for returning is included：Network-side, which is assigned, is exclusively used in the lead code that return minimizes drive test record metric data, and the return for setting multiple user equipmenies minimize drive test record metric data using call information is operated；User equipment carries out first time random access procedure to obtain ascending resource with network-side, and obtains the dedicated pointer for carrying out second of random access procedure；User equipment carries out second of random access procedure with transmitting request information, and network-side can transmit the echo message with scheduling plan according to solicited message；And user equipment is according to scheduling plan, and drive test record metric data will be minimized and be sent to network-side.Foregoing method for returning can be set multiple user equipmenies and minimize the return running of drive test record metric data, and can provide suitable contention resolution strategy.
Description
Technical field
The relevant mobile communication of the present invention, espespecially a kind of return side for being used to minimize drive test metric data in mobile communication
Method.
Background technology
Mobile communication turns into role indispensable in daily life, and therefore network operator also puts into the substantial amounts of time
With money, to ensure the communication quality and reliability of mobile communication.In traditional practice, network operator can send engineer
Drive test (drive test) is carried out with measuring vehicle to the area to be measured, to move the measurement of communication data and look for shifting
The activities such as dynamic Communication.However, traditional drive test not only needs to expend sizable cost, and the degree of accuracy of metric data
The radio environment of complexity can be limited to.
The problem of in order to solve above-mentioned, in third generation partner program (Third Generation Partnership
Project, 3GPP) specification in, one entitled " minimum drive test " (Minimization of Drive Tests's, MDT)
Solution is suggested and has been used.Minimize the measurement that drive test moves communication data using user equipment.This side
Method can not only reduce the cost expended on traditional drive test, and can be in the actual regional amount for moving communication of user
Survey, and more accurate metric data can be obtained.
However, user equipment can be set when connection mode (for example, RRC connections in the minimum drive test server of network-side
Pattern), return its instant metric data of minimum drive test (immediate MDT measurement data) collected.This
Outside, minimum drive test server may also set up user equipment and return its minimum collected in idle mode (idle mode)
Drive test record metric data (logged MDT measurement data).
In current application environment, user equipment need to be arranged at link pattern by minimizing drive test server, could be used
Family equipment minimize the return running of the instant metric data of drive test.Or, minimizing drive test server must passively etc.
Wait that the user equipment linked minimize the return running of drive test record metric data.However, some be in idle mode
User equipment, sufficient amount of minimum drive test record metric data may be had been gathered by, but without appropriate opportunity progress
Return running.In addition, also without appropriate method multiple user equipmenies can be set to carry out minimizing drive test record measurement at present
The return running of data.Therefore, drive test server is minimized can not efficiently to obtain from user equipment end and minimize drive test amount
Survey data.
The content of the invention
In view of this, in mobile communcations system, how efficiently to carry out minimizing the return fortune of drive test metric data
Make, the problem of actually industry has to be solved.
This specification provides a kind of for setting the return of one or more user equipmenies to minimize drive test record metric data
The embodiment of method, comprising：Transmission includes a call information of a report pointer, to indicate that one or more user equipmenies are returned
Minimize drive test record metric data；Receive what is transmitted by one or more user equipmenies for meeting one or more reporting conditions
One or more first lead codes；Determine one first ascending resource for authorizing one first user equipment；Transmit one first random
Access response is to first user equipment, to indicate first ascending resource and a dedicated pointer；First user is received to set
Standby one second lead code transmitted using first ascending resource；Transmit one second arbitrary access and respond to first user and set
It is standby, to indicate one second ascending resource；Receive the request letter that first user equipment is transmitted using second ascending resource
Breath；An echo message of the transmission comprising a scheduling plan is to first user equipment, to indicate that first user equipment is used for back
Report minimizes one the 3rd ascending resource that drive test records metric data；And receive first user equipment use it is the 3rd up
The minimum drive test record metric data that resource is transmitted.
This specification separately provides the embodiment that a kind of user equipment return minimizes the method for drive test record metric data, bag
Contain：The call information for including a report pointer is received, a user equipment is carried out return and minimizes drive test record metric data；
When the user equipment meets one or more reporting conditions, one first lead code is transmitted；Receive indicate one first ascending resource with
And one dedicated pointer one first arbitrary access respond；One second lead code is transmitted using first ascending resource；Receive and indicate
One second arbitrary access of one second ascending resource is responded；A solicited message is transmitted using second ascending resource；Reception is included
One echo message of one scheduling plan, the scheduling is designed for indicating that first user equipment is used to return minimum drive test record
One the 3rd ascending resource of metric data；And minimize drive test record metric data using the transmission of the 3rd ascending resource.
One of advantage of above-described embodiment, is that network-side can set multiple user equipmenies to carry out minimum road with efficient
Survey the return running of metric data.Another advantage of above-described embodiment is can be provided for multiple user equipmenies suitable competing
Settlement mechanism is striven, is operated with the return for successfully carrying out minimizing drive test metric data.The present invention other advantages will by with
Under explanation and accompanying drawing explained in more detail.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please is used to explain the application, does not constitute the improper restriction to the application.
Fig. 1 is the functional block diagram after the communication system simplification of one embodiment of the invention.
Fig. 2 is in Fig. 1 communication system, drive tests record metric data is minimized for setting multiple user equipmenies to carry out
Flow chart after the embodiment simplification of method for returning.
Embodiment
Illustrate embodiments of the present invention below in conjunction with relevant drawings.In the drawings, identical label represents phase
Same or similar element or method flow.
Fig. 1 is the functional block diagram after the simplification of communication system 100 of one embodiment of the invention.Communication system 100 is comprising most
Smallization drive test server 110, remote access network node (remote access network node, RAN node) 130 with
150, and user equipment (user equipment, UE) 160 and 180.In order that drawing is concise and ease of explanation, other elements
It is not illustrated in annexation in Fig. 1.For example, communication system 100 can additionally comprise one or more minimum drive test servers,
More remote access network nodes and/or more user equipmenies.
In network-side, minimize drive test server 110 and be used for setting minimum drive test to measure (Minimization of
Drive Tests measurement) related running.
Remote access network node 130 is configured to communicate wirelessly with 180 with user equipment 160 with 150, and
Node B (node B), enode b (evolved node B), home node-b (home node B), Yi Jiji can be used respectively
The modes such as ground sending and receiving stations (base transceiver station) are realized.
User equipment 160 and 180 includes processor 162 and 182, transmission circuit 164 and 184 and memory device respectively
Put 166 and 186.Carry out minimizing the ability that drive test is measured in addition, user equipment 160 and 180 has.For example, user equipment 160
It can be realized respectively with modes such as mobile phone, tablet PC or other suitable running gears with 180.
Fig. 2 measures numbers in Fig. 1 communication system 100 for setting multiple user equipmenies to carry out to minimize drive tests record
According to method for returning an embodiment simplify after flow chart.Fig. 1 and Fig. 2 is arranged in pairs or groups below to further illustrate communication system 100
Function mode.In order that drawing is concise, drive test server 110 and remote access network node 130 and 150 are minimized in figure
Represent to illustrate with " network-side " in 2.
In flow 200, network-side can transmit configuration information (configuration message) to user equipment 160
With 180, return is exclusively used in instruction user equipment 160 and 180 and minimizes the first lead code that drive test records metric data.Example
Such as, one of them can be selected from the set of existing 64 lead codes as the first lead code, and assigns first selected
Lead code is to be exclusively used in minimizing the return that drive test records metric data.In one embodiment, " record measurement can be used in network-side
Configuration information " (Logged Measurement Configuration message) is exclusively used in back to user equipment 160 and 180
Report minimizes the first lead code that drive test records metric data.
In flow 210, network-side can transmit the call information for including report pointer (reporting indicator)
(paging message), the user equipment 160 and 180 that idle mode is in set carries out minimizing drive test record measurement
The return running of data.
In addition, multiple user equipmenies are might have in the coverage of remote access network node, and different users
The different calling cycles (paging cycle) can be used to receive call information for equipment.Therefore, network-side can be in different callings
Call information is sent in cycle to multiple user equipmenies, network-side is recorded to sufficient amount of minimum drive test has been obtained
One or more user equipmenies of metric data, efficiently obtain and minimize drive test record metric data.
In one embodiment, when user equipment meets one or more reporting conditions (reporting constraint),
User equipment can minimize drive test record metric data to network-side return.Reporting conditions can be built into the memory of user equipment
In device, or user equipment sent to by network-side in advance.For example, network-side can use configuration information and/or call information
To transmit report pointer, which kind of reporting conditions is used with instruction user equipment.For example, network-side can transmit reporting conditions table to use
Family equipment, this report condition table includes the multiple thresholds for the data volume for minimizing drive test metric data.When report pointer indicates to use
Family equipment, it is 20KB that should use the threshold in reporting conditions table, possesses the minimum drive test metric data more than 20KB data volumes
User equipment just can to network-side return minimize drive test record metric data.
In flow 220, after user equipment receives call information, if user equipment meets reporting conditions, it can pass
The first lead code is sent to network-side.In the present embodiment, PRACH (physical can be used in user equipment
Random access channel, PRACH) first time random access procedure is carried out, to transmit the first lead code.
In flow 230, the quantity that network-side can be according to the first lead code received, and determine in the second arbitrary access
Authorized in program user equipment be used for return minimize drive test record metric data ascending resource.In one embodiment, network
End can be used for transmitting the arbitrary access resource of the first lead code according to user equipment, and calculate the number of the first lead code received
Amount.In another embodiment, the power ratio (power ratio) that network-side also can be according to arbitrary access resource, and calculate and receive
The quantity of the first lead code arrived.If network-side is not received by the first lead code, also do not detectd in PRACH
Appropriate power ratio is measured, represent needs the return for minimize drive test record metric data to operate without user equipment, then
Network-side will not authorize the return running that ascending resource to user equipment minimize drive test record metric data.
In flow 240, network-side can transmit the first arbitrary access corresponding with the first lead code to user equipment and respond
(random access response), to indicate the first ascending resource and dedicated pointer.In the second random access procedure,
User equipment can use the first ascending resource to transmit the second lead code, and then carry out the second arbitrary access using dedicated pointer
The reception running of response.For example, network-side can by one be exclusively used in return minimize drive test record metric data it is special with
Machine access wireless electric network interim identity (random access radio network temporary identifier,
RA-RNTI) it is set to dedicated pointer.
In flow 250, after user equipment, which receives the first arbitrary access, to be responded, before user equipment can randomly choose one
Leading code is come as the second lead code, and leading to transmit second using the first ascending resource indicated by the first arbitrary access is responded
Code.In addition, the second lead code is configured to different from the first lead code.If user equipment does not receive the first arbitrary access and returned
Should, user equipment can stop to minimize the return flow of drive test record metric data, and maintain idle mode.
In flow 260, network-side can transmit the second arbitrary access response to user equipment.Bag is responded in second arbitrary access
Containing one or more medium plan (media access control, MAC) packet data unit (packet data
units,PDUs).Each medium plan packet data unit can indicate one or more second ascending resources for user
Equipment transmitting request information, and one or more corresponding upstream times with reference to (uplink timing reference) for
User equipment carries out the running of uplink synchronous.
In traditional arbitrary access flow, user equipment can use non-dedicated radio net interim identity
(radio network temporary identifier, RNTI), the medium access control that arbitrary access is responded is carried to find
Packet data unit processed, wherein non-dedicated radio net interim identity related can be used for transmitting lead code with user equipment
Ascending resource.In the present embodiment, multiple user equipmenies are configured to remember using the same return minimum drive test that is exclusively used in
The special arbitrary access radio net interim identity of metric data is recorded, the media that the second arbitrary access is responded are carried to find
Access control packet data unit.If because user equipment is continuing with non-dedicated radio net interim identity to find
Medium plan packet data unit, then minimize the arbitrary access radio net that drive test records metric data for returning
Interim identity may be produced with the situation using other network temporary identities to conflict.Therefore, even if user equipment is used
Different ascending resources, still results in competition (contention) generation.
Further, since multiple user equipmenies can use same special arbitrary access radio net interim identity to connect
The second arbitrary access response is received, therefore, even if different user equipmenies transmits the second lead code in different ascending resources, still
The generation of competition can not be avoided.In order to solve this problem, network-side can be the second of medium plan packet data unit
Arbitrary access increases special identification in responding.When multiple user equipmenies transmit the second lead code in different ascending resources,
Special identification can be used to identify different user equipmenies.For example, network-side can transmit the second lead code according to user equipment
Ascending resource, and produce the special identification corresponding to the user equipment.Therefore, even if user equipment is transmitted in different resources
Identical lead code, network-side still can recognize that each user equipment, and user equipment can also correctly find carrying second
The medium plan packet data unit of lead code.
Because user equipment recognizes and is exclusively used in return minimum drive test record measurement data report by using special
Special arbitrary access radio net interim identity, with find carry the second access response medium plan package number
According to unit.Therefore, in flow 270, user equipment can use the second arbitrary access to respond the second indicated ascending resource and pass
Send solicited message.In addition, the function in order to provide contention resolved, user equipment can transmit in solicited message and be specific to the use
The user equipment specific identity code (for example, user equipment identity UE identity) of family equipment.
In flow 280, network-side can receive solicited message, and transmit the echo message for including scheduling plan to user
Equipment.Scheduling plan, which is included, to be used to allow user equipment return to minimize the 3rd ascending resource that drive test records metric data.
In addition, network-side can also can transmit contention resolved identity code in echo message, for the user with flow 270
Equipment specific identity code is compared running, to provide the mechanism of contention resolved.When contention resolved identity code and user equipment are special
Determine identity code it is identical when, then contention resolved success.If both differ, contention resolved failure, user equipment can stop minimum
Change the return flow that drive test records metric data.
In flow 290, user equipment can be according to the scheduling plan in echo message, and returns and minimize drive test recorded amounts
Survey data.
After user equipment completes return minimum drive test record metric data, user equipment will can be used for depositing minimum
The memory of drive test record metric data is purged running, to store follow-up minimum drive test metric data or other numbers
According to.Also, user equipment is still maintained at idle mode.
In the above-described embodiment, network-side can be efficiently set in the coverage of remote access network node
Multiple user equipmenies, carry out minimize drive test record metric data return running.In addition, being used by call information
Pointer is reported, network-side can more flexiblely adjust return and minimize the threshold that drive test records metric data.
In the above-described embodiment, by the special identification using user equipment, user equipment specific identity code, Yi Jijing
Solution identity code etc. is striven, even if multiple user equipmenies, which need to return, minimizes drive test record metric data, can also provide suitable
Contention resolution strategy.
The size and relative size of some elements of accompanying drawing can be amplified, or the shape of some elements can be simple
Change, more clearly to express the content of embodiment.Therefore, unless applicant specializes, the shape of each element in accompanying drawing
Shape, size, relative size and relative position etc. are only easy for explanation, and should not be taken to limit the scope of the claims of the present invention.This
Outside, the present invention can be embodied with many different forms, when explaining the present invention, should not be limited only to what this specification was proposed
Embodiment aspect.
Some vocabulary have been used in specification and claim to censure specific element.However, affiliated technology
The technical staff in field is, it is to be appreciated that same element may be called with different nouns.Specification and apply for a patent model
Enclose not in the way of the difference of title is as differentiation element, but be used as the base of differentiation with the difference of element functionally
It is accurate.It is open term in the "comprising" mentioned by specification and claim, therefore should be construed to " include but do not limit
In ".In addition, " coupling " is herein comprising any direct and indirect connection means.Therefore, if the first element is coupled to described in text
Second element, then represent the first element can by being electrically connected with or being wirelessly transferred, the signal connected mode such as optical delivery and it is direct
Ground is connected to the second element, or electrical or signal is connected to second element indirectly by other elements or connection means.
It is used herein " and/or " describing mode, include any group of one of cited or multiple projects
Close.In addition, unless specialized in specification, otherwise the term of any odd number lattice all includes the connotation of plural lattice simultaneously.
Embodiments herein is the foregoing is only, the application is not limited to, for those skilled in the art
For member, the application can have various modifications and variations.All any modifications within spirit herein and principle, made,
Equivalent substitution, improvement etc., all should be included within the scope of claims hereof.
Claims (20)
1. a kind of be used to set the return of one or more user equipmenies to minimize the method that drive test records metric data, its feature exists
In, comprising：
Transmission includes a call information of a report pointer, to indicate that one or more user equipmenies return minimizes drive test record
Metric data；
Receive one or more first lead codes transmitted by one or more user equipmenies for meeting one or more reporting conditions；
Determine one first ascending resource for authorizing one first user equipment；
Transmit one first arbitrary access to respond to first user equipment, to indicate first ascending resource and a special finger
Pin；
Receive one second lead code that first user equipment is transmitted using first ascending resource；
Transmit one second arbitrary access to respond to first user equipment, to indicate one second ascending resource；
Receive the solicited message that first user equipment is transmitted using second ascending resource；
An echo message of the transmission comprising a scheduling plan is to first user equipment, to indicate that first user equipment is used for back
Report minimizes one the 3rd ascending resource that drive test records metric data；And
Receive the minimum drive test record metric data that first user equipment is transmitted using the 3rd ascending resource.
2. the method as described in claim 1, it is characterised in that additionally comprise：
A configuration information is transmitted to one or more user equipmenies, to indicate that first lead code is to be exclusively used in return to minimize road
Survey record metric data.
3. method as claimed in claim 2, it is characterised in that additionally comprise：
At least one in the configuration information or the call information transmits one or more reporting conditions.
4. method as claimed in claim 3, it is characterised in that additionally comprise：
The call information is transmitted using one or more calling cycles, to set one or more user equipmenies return to minimize drive test
Record metric data.
5. the method as described in claim 1, it is characterised in that additionally comprise：
According to be used for transmit one or more first lead codes one or more the first arbitrary access resources a quantity and this one
Or at least one of a power ratio of multiple first arbitrary access resources, and determine for authorizing first user equipment
First ascending resource.
6. the method as described in claim 1, it is characterised in that additionally comprise：
The dedicated pointer is transmitted in first arbitrary access response, first user equipment is obtained according to the dedicated pointer
A medium plan packet data unit carrier in second arbitrary access response, and returned according to second arbitrary access
Should in the medium plan packet data unit carrier and obtain the information of second ascending resource.
7. method as claimed in claim 6, it is characterised in that second arbitrary access, which is responded to include, to be used to recognize first use
The special identification of the one of family equipment, the special identification be according to first user equipment transmit used in second lead code this
One ascending resource is calculated and obtained.
8. the method as described in claim 1, it is characterised in that the solicited message includes and is specific to the one of first user equipment
User equipment specific identity code.
9. method as claimed in claim 8, it is characterised in that the echo message includes a contention resolved identity code, for
The user equipment specific identity code is compared, and carries out a contention resolved running.
10. the method as described in claim 1, it is characterised in that first lead code is to be exclusively used in return to minimize drive test note
Metric data is recorded, and first lead code is arranged to be different from second lead code.
11. a kind of user equipment return minimizes the method that drive test records metric data, it is characterised in that include：
The call information for including a report pointer is received, user equipment progress return is minimized drive test record and measures number
According to；
When the user equipment meets one or more reporting conditions, one first lead code is transmitted；
Receive and indicate that one first arbitrary access of one first ascending resource and a dedicated pointer is responded；
One second lead code is transmitted using first ascending resource；
Receive and indicate that one second arbitrary access of one second ascending resource is responded；
A solicited message is transmitted using second ascending resource；
The echo message for including a scheduling plan is received, the scheduling is designed for indicating that the user equipment is used to return minimum
Drive test records one the 3rd ascending resource of metric data；And
Drive test record metric data is minimized using the transmission of the 3rd ascending resource.
12. method as claimed in claim 11, it is characterised in that additionally comprise：
A configuration information is received, the configuration information is used to indicate that first lead code is to be exclusively used in return to minimize drive test recorded amounts
Survey data.
13. method as claimed in claim 12, it is characterised in that additionally comprise：
At least one in the configuration information or the call information receives one or more reporting conditions.
14. method as claimed in claim 11, it is characterised in that additionally comprise：
A dedicated pointer is received in first arbitrary access response；
According to the dedicated pointer medium plan packet data unit carrier is obtained in second arbitrary access response；With
And
According to the medium plan packet data unit carrier the second up money is obtained in second arbitrary access response
The information in source.
15. method as claimed in claim 14, it is characterised in that additionally comprise：
The special identification for recognizing the user equipment is received in second arbitrary access response；
Wherein the special identification is that first ascending resource for transmitting second lead code according to the user equipment is calculated and obtained.
16. method as claimed in claim 11, it is characterised in that additionally comprise：
Transmission is specific to a user equipment specific identity code of the user equipment in solicited message.
17. method as claimed in claim 16, it is characterised in that the echo message includes a contention resolved identity code, is used for
It is compared with the user equipment specific identity code, to carry out a contention resolved running.
18. method as claimed in claim 11, it is characterised in that first lead code is to be exclusively used in return to minimize drive test note
Metric data is recorded, and first lead code is arranged to be different from second lead code.
19. method as claimed in claim 11, it is characterised in that additionally comprise：
After transmission minimizes drive test record metric data, the memory that drive test records metric data will be minimized for depositing
It is purged running.
20. method as claimed in claim 19, it is characterised in that additionally comprise：
After the memory is removed, the user's set is set to be maintained at an idle mode.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201261681624P | 2012-08-10 | 2012-08-10 | |
| US61/681,624 | 2012-08-10 | ||
| US13/963,518 US9338681B2 (en) | 2012-08-10 | 2013-08-09 | Method for reporting minimization drive test measurement data |
| US13/963,518 | 2013-08-09 |
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| CN103582001A CN103582001A (en) | 2014-02-12 |
| CN103582001B true CN103582001B (en) | 2017-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310349615.0A Active CN103582001B (en) | 2012-08-10 | 2013-08-12 | Minimize the method for returning of drive test metric data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109587769B (en) | 2017-09-28 | 2022-02-22 | 中兴通讯股份有限公司 | Data transmission method and device and search space optimization method and device |
| CN111314931B (en) * | 2019-01-18 | 2022-04-12 | 维沃软件技术有限公司 | Measuring method and apparatus |
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|---|---|---|---|---|
| WO2011101026A1 (en) * | 2010-02-17 | 2011-08-25 | Nokia Siemens Networks Oy | Minimization of drive tests in a mobile communications network |
| CN102342145A (en) * | 2009-03-20 | 2012-02-01 | 瑞典爱立信有限公司 | Method and Apparatus for Monitoring a Random Access Channel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102804850B (en) * | 2009-06-26 | 2015-06-10 | Lg电子株式会社 | Method of logging measurement result at handover failure in wireless communication system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102342145A (en) * | 2009-03-20 | 2012-02-01 | 瑞典爱立信有限公司 | Method and Apparatus for Monitoring a Random Access Channel |
| WO2011101026A1 (en) * | 2010-02-17 | 2011-08-25 | Nokia Siemens Networks Oy | Minimization of drive tests in a mobile communications network |
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