CN102843736B - Cell switching method and device - Google Patents
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- CN102843736B CN102843736B CN201110171035.8A CN201110171035A CN102843736B CN 102843736 B CN102843736 B CN 102843736B CN 201110171035 A CN201110171035 A CN 201110171035A CN 102843736 B CN102843736 B CN 102843736B
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Abstract
The invention discloses a kind of cell switching method and device, this method includes：BSC receives the measurement report from MS on SDCCH channels；BSC determines the Target cell that MS switches according to measurement report；BSC initiates switchings of the MS to Target cell according to the assignment request message from core net.The present invention can be reduced between network and MS in the Signalling exchange eated dishes without rice or wine, and helped to provide the user with preferable call voice quality and reduced cutting off rate.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of cell switching method and device.
Background technology
At present, global mobile communication (Global system for Mobile Communication, referred to as GSM) system
The soft switch of system is generally assigned using appointment simultaneously or evening, i.e. and Calling Side waits called paging to respond on SDCCH channels,
While called paging responds or afterwards, base station controller (Base Station Controller, referred to as BSC) initiates master
Side is cried in the appointment process of serving cell.But above-mentioned waiting process can increase the time that Calling Side takes SDCCH channels, from
And it may cause to exhale rear Calling Side to be moved to another serving cell.Now, can if assigned in this serving cell
Calling Side is caused just to assign completion just to initiate the switching on TCH because the level signal of serving cell is poor, so as to influence to lead to
Language sound quality, even result in the access call drop not as good as triggering TCH switchings later.
, can be by opening SDCCH handoff functionalities (i.e. after Calling Side is switched to preferable cell BSC in correlation technique
Appointment process is initiated again) to solve the above problems.Specifically, wait what called paging responded on SDCCH channels in Calling Side
During, Calling Side is on SDCCH channels to BSC reporting measurement reports.BSC switches over according to the data of measurement report to be sentenced
Certainly, if switch decision is set up, switching of the Calling Side on SDCCH channels is initiated, after the completion of to be switched, BSC, which is received, to be come from
After the assignment request message of core net, then cell initiation appointment process after handover.
As can be seen here, above-mentioned access procedure is divided into the handoff procedure of SDCCH channels and cell after handover assigns process,
That is successively interaction twice be present in BSC and mobile station (Mobile Station, referred to as MS), which increase network and MS it
Between in the Signalling exchange eated dishes without rice or wine, SDCCH switching cutting off rates will be improved.
The content of the invention
For BSC in correlation technique and MS exist successively twice interaction so as to improving in SDCCH channel switching process
Cutting off rate the problem of and propose the present invention, therefore, it is a primary object of the present invention to provide a kind of cell switching method and dress
Put, to solve the above problems.
To achieve these goals, according to an aspect of the invention, there is provided a kind of cell switching method.
Included according to the cell switching method of the present invention：BSC receives the measurement report from MS on SDCCH channels；
BSC determines the Target cell that MS switches according to measurement report；BSC according to the assignment request message from core net, initiate MS to
The switching of Target cell.
Preferably, in BSC according to the assignment request message from core net, MS is initiated to before the switching of Target cell,
The above method also includes：BSC receives assignment request message.
Preferably, before BSC receives assignment request message, the above method also includes：BSC judges the letter in measurement report
Whether road handoff parameter is more than or equal to call drop thresholding set in advance；If channel handoff parameter is less than call drop thresholding, directly
Initiate switchings of the MS to the Target cell.
Preferably, BSC judges whether the channel handoff parameter in measurement report is more than or equal to directly switching set in advance
Thresholding includes：BSC continuously judges whether the channel handoff parameter in N number of measurement report is more than or equal to directly switching set in advance
Thresholding, wherein N values are preset by BSC；It is more than or equal to if there is the channel handoff parameter in P measurement report and presets
Direct handoff threshold, then BSC judge that channel handoff parameter in measurement report is more than or equal to directly switching door set in advance
Limit, wherein P values are preset by BSC.
Preferably, if channel handoff parameter is more than or equal to call drop thresholding, the above method also includes：Configuration SDCCH is cut
Protection timer is changed, wherein SDCCH switch protectings timer is used to indicate BSC in the first-class request message to be designated of SDCCH channels
Time, and if SDCCH switch protectings timer then, then BSC directly initiates switchings of the MS to Target cell.
Preferably, if channel handoff parameter is more than or equal to call drop thresholding, the above method also includes：BSC judges measurement
Whether the channel handoff parameter of serving cell is more than the channel handoff parameter of abutting subdistrict in measurement report in report；If measurement
The channel handoff parameter of serving cell is more than the channel handoff parameter of abutting subdistrict in measurement report in report, then does not initiate MS's
Cell switches.
Preferably, according to measurement report, determine the Target cell of MS switchings includes BSC：BSC is according to one in measurement report
One or more adjacent areas are ranked up by the descending order of the level informations of individual or multiple adjacent areas；BSC determines that the level is believed
The preceding adjacent area of breath sequence is the Target cell of MS switchings.
Preferably, BSC determines that the preceding adjacent area of sequence includes for the Target cell of MS switchings：Exist if there is multiple sequences
Preceding adjacent area, then BSC can use the descending order of number according to the TCH of multiple adjacent areas, multiple adjacent areas are ranked up；BSC is true
The fixed TCH can be the Target cell of MS switchings with the preceding adjacent area of number sequence.
Preferably, according to the assignment request message from core net, initiate switchings of the MS to Target cell includes BSC：BSC
TCH channels are distributed in Target cell；BSC sends switching command to MS, and wherein switching command is used to indicate that MS uses TCH channels
Accessed.
To achieve these goals, according to another aspect of the present invention, there is provided a kind of cell switching device.
Included according to the cell switching device of the present invention：Receiving module, for receiving the survey from MS on SDCCH channels
Amount report；Determining module, for according to measurement report, determining the Target cell that MS switches；Initiation module, core is come from for basis
The assignment request message of heart net, initiate switchings of the MS to Target cell.
It by the present invention, interaction will simplify as an interaction, i.e., switch similar to SDCCH channels twice
During determine Target cell, then after similar to switching cell assign during according to the appointment from core net please
Message is asked directly to initiate the switching to the Target cell, so as to reduce BSC and MS falling in SDCCH channel switching process
Words rate, and help to provide the user with preferable call voice quality.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of cell switching method according to embodiments of the present invention；
Fig. 2 is the flow chart of cell switching method according to the preferred embodiment of the invention；
Fig. 3 is the structured flowchart of cell switching device according to embodiments of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The embodiments of the invention provide a kind of cell switching method, Fig. 1 is cell switching side according to embodiments of the present invention
The flow chart of method, as shown in figure 1, including steps S102 to step S106.
Step S102, BSC receive the measurement report from MS on SDCCH channels.
Step S104, BSC determine the Target cell that MS switches according to measurement report.
Step S106, BSC initiate switchings of the MS to Target cell according to the assignment request message from core net.
In correlation technique, MS access procedures are divided into the handoff procedure of SDCCH channels and cell after handover assigns process,
That is there is successively interaction twice in BSC and MS, so as to cause the cutting off rate in SDCCH channel switching process higher.The present invention
In embodiment, it interaction will simplify as an interaction, i.e., be determined during switching similar to SDCCH channels twice
Target cell, it is then direct according to the assignment request message from core net during the cell after similar to switching is assigned
The switching to the Target cell is initiated, so as to reduce the cutting off rate of BSC and MS in SDCCH channel switching process.
Preferably, in BSC according to the assignment request message from core net, MS is initiated to before the switching of Target cell,
The above method also includes：BSC receives assignment request message.
Assignment request message in this preferred embodiment be core net send, its may BSC determine Target cell it
Preceding transmission, it is also possible to sent after BSC determines Target cell.If core net is sent before BSC determines Target cell
, then BSC directly can initiate MS to Target cell after receiving the assignment request message according to the assignment request message
Switching；If core net is sent after BSC determines Target cell, BSC after Target cell it is determined that need to wait
The assignment request message, to initiate switchings of the MS to Target cell according to the assignment request message.
Preferably, before BSC receives assignment request message, the above method also includes：BSC judges the letter in measurement report
Whether road handoff parameter is more than or equal to call drop thresholding set in advance；If channel handoff parameter is less than call drop thresholding, directly
Initiate switchings of the MS to Target cell.
In correlation technique, MS rise exhale after can move into another serving cell, so as to cause the electricity due to serving cell
Ordinary mail number is deteriorated and causes call drop.In this preferred embodiment, call drop thresholding set in advance is the worst electricity that MS can tolerate
Jib door limits, if the level signal of the serving cell of the channel handoff parameter instruction in measurement report is continuous worsening and falls less than this
Thresholding is talked about, then the MS bit error rates can be caused too high and call drop occur.Therefore, BSC judge channel handoff parameter in measurement report compared with
When poor, it is no longer waiting for the assignment request message of core net transmission and directly initiates the switching to Target cell, it is ensured that MS is not
Call drop, improve Consumer's Experience.
There are MS call drops in order to avoid the bit error rate is too high, at the same avoid BSC and MS because of interaction twice call drop, this
Invention is also improved the above method in terms of following two respectively.
1. the improvement of determination methods：That is BSC continuously judges whether the channel handoff parameter in N number of measurement report is more than or equal to
Direct handoff threshold set in advance, wherein N values are preset by BSC；Switch ginseng if there is the channel in P measurement report
Number is more than or equal to direct handoff threshold set in advance, then BSC judges that the channel handoff parameter in measurement report is more than or equal in advance
The direct handoff threshold first set, wherein P values are preset by BSC.
This improved method has further refined BSC and has judged whether channel handoff parameter is more than or equal to the mistake of direct handoff threshold
Journey.By electing the P channel handoff parameters for being more than or equal to direct handoff threshold in N number of channel handoff parameter, can avoid
The error in judgement caused by the unstability of wireless environment.
2. initiate the improvement of Target cell switching：Configure SDCCH switch protecting timers, wherein SDCCH switch protectings
Timer is used to indicate times of the BSC in the first-class request message to be designated of SDCCH channels, and if SDCCH switch protectings are determined
When device then, then BSC directly initiates switchings of the MS to Target cell.
This improved method is configured with SDCCH switch protectings timer
When the level signal of current service cell on SDCCH channels is more than call drop thresholding (the minimum level thresholding that can be tolerated) etc.
The request message to be designated most long time.Directly according to the appointment if BSC receives assignment request message in the duration
Request message initiates switchings of the MS to Target cell；If BSC does not receive assignment request message in the duration, no longer etc.
Treat the assignment request message that core net is sent and directly initiate the switching to Target cell.This way it is possible to avoid although current clothes
The level signal of business cell is more than call drop thresholding, but because the continuous worsening of level signal causes the bit error rate too high and call drop occur
Etc. abnormal conditions.
In addition, in the case where the channel handoff parameter during BSC judges measurement report is more than or equal to call drop thresholding, above-mentioned side
Method also includes：BSC judges whether the channel handoff parameter of serving cell in measurement report is more than abutting subdistrict in measurement report
Channel handoff parameter (i.e. following " non-retrospective judgements ")；If the channel handoff parameter of serving cell is more than in measurement report
The channel handoff parameter of abutting subdistrict in measurement report, then MS cell switching is not initiated.
In this preferred embodiment, because the level signal of current service cell is more than the level signal of abutting subdistrict, therefore
The cell that it is suitably MS services that current service cell, which is, therefore MS cell switching is not initiated, it is ensured that MS is serviced continuous
Property, improve Consumer's Experience.
It should be noted that 3. this preferred embodiment can be combined with above-mentioned improved method, i.e., only on SDCCH channels
The level signal of current service cell is located at the level of call drop thresholding (the minimum level thresholding that can be tolerated) and Target cell
When between signal, just configure SDCCH switch protecting timers, so as to combine improved method 3. the advantages of, to greatest extent
Avoid MS call drops.
Preferably, according to measurement report, determine the Target cell of MS switchings includes BSC：BSC is according to one in measurement report
One or more adjacent areas are ranked up by the descending order of the level informations of individual or multiple adjacent areas；BSC determines that the level is believed
The preceding adjacent area of breath sequence is the Target cell of MS switchings.Wherein it is further preferred that BSC determines that the preceding adjacent area of sequence is cut for MS
The Target cell changed includes：If there is multiple preceding adjacent areas of sequence, then BSC can be with number by big according to the TCH of multiple adjacent areas
To small order, multiple adjacent areas are ranked up；BSC determines that the TCH can be the target of MS switchings with the preceding adjacent area of number sequence
Cell.
In this preferred embodiment, comprehensive level signal and TCH can determine Target cell with several two factors.It is switched to electricity
Ordinary mail number is preferably and TCH can use the more adjacent area of number, can improve the success rate of switching, avoid MS call drops.
Preferably, according to the assignment request message from core net, initiate switchings of the MS to Target cell includes BSC：BSC
TCH channels are distributed in Target cell；BSC sends switching command to MS, and wherein switching command is used to indicate that MS uses TCH channels
Accessed.
To sum up, the invention provides a kind of method for directly retrying preferable cell, the present invention is according on SDCCH channels
Measurement report, retrospective and non-retrospective switch decision is carried out, believed if retrospective switching, and in the level of serving cell
Number also without it is poor to the degree for wanting call drop when, the switching on SDCCH channels wouldn't be initiated, preserve the Target cell of switching, waited
Certain time, if non-retrospective switching, switching target small area is equally preserved, the assignment request message when receiving core net
Afterwards, the switching of Target cell obtained to switch decision is directly initiated, reaches the purpose for directly retrying preferable cell, is reduced
In the Signalling exchange eated dishes without rice or wine between network and MS, help to provide the user with preferable call voice quality and reduction call drop is several
Rate.
The implementation process of the embodiment of the present invention is described in detail below in conjunction with example.
This example essentially describes BSC and switches over judgement according to the measurement report on SDCCH when assigning, and selects level
The signal adjacent area better than this cell, directly retries the adjacent area, reaches and reduces between network and MS in the Signalling exchange eated dishes without rice or wine, has
Help provide the user with preferable call voice quality and reduce the purpose of call drop probability.
Fig. 2 is the flow chart of cell switching method according to the preferred embodiment of the invention, as shown in Fig. 2 including following
Step S201 to step S244.
Step S201, BSC configuration SDCCH channel handoff parameters.Specifically, BSC configures the direct handoff thresholds of SDCCH, N values
Minimum level thresholding that parameter, P value parameters, cell can be tolerated, cell are joined in the time of the first-class request messages to be designated of SDCCH
Time of the several and cell in the first-class request messages to be designated of SDCCH.This method configures retrospective and non-retrospective switching simultaneously
Decision threshold, be stored in background data base.
Step S202, BSC receive SDCCH ChannelMeasurementReport DETAILEDs.Specifically, after MS accesses network on SDCCH channels, MS
It can not stop to measure neighboring BS information and report base station, base station is periodically (usual by measurement report by the neighboring BS information that MS is measured
It is every 470ms on SDCCH channels) BSC is reported, BSC receives and preserved nearest continuous N number of measurement report letter that BTS is reported
Breath, to switch over judgement using SDCCH switch decision formula according to the measurement report information.Wherein, measurement report information
Including：The descending level value of adjacent area and the up-downgoing level value and the bit error rate of current service cell.BSC is by each measurement report
Information is preserved, and is used for follow-up switch decision.
Whether step S204, retrospective switch decision are set up, if it is, carrying out step S206, otherwise carry out step
S226。
Preferably, this switch decision uses the gentle quality of downlink electrical (bit error rate) both handoff algorithms, downlink electrical truncation
The judgement formula of scaling method is：AvRxLevelDL (n)≤HoDlLevThs, wherein AvRxLevelDL are serving cell downlink electrical
Flat, HoDlLevThs is that threshold value is changed in the downlink electrical truncation that backstage is set.Downlink quality switching judgement formula be：
AvRxQualDL (n) >=HoDlQualThs, wherein AvRxQualDL are the descending bit error rate of serving cell, after HoDlQualThs is
The downlink quality handoff threshold value that platform is set.
Preferably, the condition that this switch decision is set up is that have P measurement report to meet condition in N number of measurement report, wherein
N number of measurement report can be the newest measurement report received of BSC and the preceding N-1 measurement report preserved before.
Step S206, judges whether serving cell level is less than the minimum levels value that the cell of backstage configuration can be tolerated,
If it is, carrying out step S208, step S210 is otherwise carried out.
Step S208, the switching of SDCCH channels is directly initiated, is assigned again on Target cell after the completion of to be switched, this
Secondary flow terminates.
Step S210, obtains Target cell from measurement report.
Step S212, judges whether SDCCH switch protectings timer starts, if it is, carrying out step S216, otherwise enters
Row step S214.
Step S214, start SDCCH switch protecting timers.
Step S216, assign strategy to be set to and directly retry.
Step S218, judge whether to receive assignment request message, if it is carry out step S220, otherwise carry out step
S222。
Step S220, directly retries Target cell, and this flow terminates.
Step S222, judge whether SDCCH switch protectings timer is overtime, if it is, carrying out step S224, otherwise return
Return step S202.
Step S224, the switching of SDCCH channels is directly initiated, after the completion of to be switched, is assigned in Target cell, this stream
Journey terminates.
Step S226, judges whether SDCCH switch protectings timer starts, if it is, carrying out step S228, otherwise enters
Row step S230.
Step S228, stop SDCCH switch protecting timers.
Step S230, strategy is assigned to be set to without directly retrying.
Whether step S232, non-retrospective switch decision are set up, if it is, carrying out step S234, otherwise carry out step
S238。
Preferably, this switch decision uses PBGT handoff algorithms, and PBGT switch decision formula are：PBGT ＞
HoMarginPbgt, wherein PBGT are the PBGT values of abutting subdistrict, and HoMarginPbgt is the PBGT handoff thresholds of abutting subdistrict
Value.
Preferably, the condition that this switch decision is set up is that have P measurement report to meet condition in N number of measurement report, wherein
N number of measurement report can be the newest measurement report received of BSC and the preceding N-1 measurement report preserved before.
Step S234, Target cell is obtained from measurement report, specifically, by the best neighbour of level signal in measurement report
Area saves as Target cell.
Step S236, assign strategy to be set to and directly retry.
Step S238, judge whether to receive the assignment request message of core net, if it is, carrying out step S240, otherwise
Return to step S202.
Step S240, judge that whether assign strategy to put is directly to retry, if it is, carrying out step S242, is otherwise carried out
Step S244.
Step S242, directly retries Target cell, and this flow terminates.
Step S244, is assigned in serving cell, and this flow terminates.
It should be noted that can be in such as one group of computer executable instructions the flow of accompanying drawing illustrates the step of
Performed in computer system, although also, show logical order in flow charts, in some cases, can be with not
The order being same as herein performs shown or described step.
The embodiments of the invention provide a kind of cell switching device, the cell switching device can be used for realizing above-mentioned cell
Switching method.Fig. 3 is the structured flowchart of cell switching device according to embodiments of the present invention, as shown in figure 3, including receiving module
32nd, determining module 34 and initiation module 36.Its structure is described in detail below.
Receiving module 32, for receiving the measurement report from MS on SDCCH channels；Determining module 34, is connected to and connects
Module 32 is received, for the measurement report received according to receiving module 32, determines the Target cell that MS switches；Initiation module 36, even
Determining module 34 is connected to, for according to the assignment request message from core net, initiating the target that MS determines to determining module 34
The switching of cell.
It should be noted that the cell switching device described in device embodiment corresponds to above-mentioned embodiment of the method, its
Concrete implementation process had carried out detailed description in embodiment of the method, will not be repeated here.
In summary, according to the abovementioned embodiments of the present invention, there is provided a kind of cell switching method and device.This method will
Interaction twice in correlation technique is simplified as an interaction, i.e., during switching similar to SDCCH channels really
Set the goal cell, then straight according to the assignment request message from core net during the cell after similar to switching is assigned
Sending and receiving play the switching to the Target cell, so as to reduce the cutting off rate of BSC and MS in SDCCH channel switching process, and
Help to provide the user with preferable call voice quality and reduce cutting off rate.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored
Performed in the storage device by computing device, either they are fabricated to respectively each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific
Hardware and software combines.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. cell switching method, it is characterised in that including：Base station controller BSC receives the measurement report from mobile station MS on SDCCH channels；The BSC determines the Target cell that the MS switches according to the measurement report；The BSC initiates switchings of the MS to the Target cell according to the assignment request message from core net.
- 2. according to the method for claim 1, it is characterised in that disappeared in the BSC according to the assignment request from core net Breath, before initiating switchings of the MS to the Target cell, methods described also includes：The BSC receives the assignment request Message.
- 3. according to the method for claim 2, it is characterised in that before the BSC receives the assignment request message, institute Stating method also includes：The BSC judges whether the channel handoff parameter in the measurement report is more than or equal to call drop thresholding set in advance；If the channel handoff parameter is less than the call drop thresholding, the MS cutting to the Target cell is directly initiated Change.
- 4. according to the method for claim 3, it is characterised in that the BSC judges the channel switching in the measurement report Whether parameter, which is more than or equal to directly handoff threshold set in advance, includes：It is set in advance direct that the BSC continuously judges whether the channel handoff parameter in N number of measurement report is more than or equal to Handoff threshold, wherein N values are preset by the BSC；It is more than or equal to direct handoff threshold set in advance if there is the channel handoff parameter in the P measurement reports, then The BSC judges that the channel handoff parameter in the measurement report is more than or equal to direct handoff threshold set in advance, wherein P values Preset by the BSC.
- 5. according to the method for claim 3, it is characterised in that if the channel handoff parameter is more than or equal to the call drop Thresholding, then methods described also include：SDCCH switch protecting timers are configured, wherein the SDCCH switch protectings timer is used to indicate the BSC described Wait the time of the assignment request message on SDCCH channels, and if the SDCCH switch protectings timer then, then The BSC directly initiates switchings of the MS to the Target cell.
- 6. according to the method for claim 3, it is characterised in that if the channel handoff parameter is more than or equal to the call drop Thresholding, then methods described also include：It is adjacent in the measurement report that the BSC judges whether the channel handoff parameter of serving cell in the measurement report is more than The channel handoff parameter of cell；If the channel handoff parameter of serving cell is more than the channel of abutting subdistrict in the measurement report in the measurement report Handoff parameter, then the cell switching of the MS is not initiated.
- 7. method according to any one of claim 1 to 6, it is characterised in that the BSC according to the measurement report, Determining the Target cell of the MS switchings includes：The BSC is according to the descending order of the level information of one or more of measurement report adjacent area, to described One or more adjacent areas are ranked up；The BSC determines the Target cell that the preceding adjacent area of level information sequence is MS switchings.
- 8. according to the method for claim 7, it is characterised in that the BSC determines that the preceding adjacent area of sequence is cut for the MS The Target cell changed includes：If there is the preceding adjacent areas of multiple sequences, then the BSC according to the multiple adjacent area TCH can with number by greatly to Small order, the multiple adjacent area is ranked up；The BSC determines that the TCH can be the Target cell of MS switchings with the preceding adjacent area of number sequence.
- 9. method according to any one of claim 1 to 6, it is characterised in that the BSC is according to the finger from core net Request message is sent, initiating switchings of the MS to the Target cell includes：The BSC distributes TCH channels in the Target cell；The BSC sends switching command to the MS, wherein the switching command is used to indicate that the MS uses the TCH channels Accessed.
- A kind of 10. cell switching device, it is characterised in that including：Receiving module, for receiving the measurement report from mobile station MS on SDCCH channels；Determining module, for according to the measurement report, determining the Target cell that the MS switches；Initiation module, for according to the assignment request message from core net, initiating switchings of the MS to the Target cell.
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| CN103945467B (en) * | 2014-04-21 | 2018-04-27 | 大唐移动通信设备有限公司 | Cell switching method and system, base station, terminal |
| CN107241773A (en) * | 2016-03-28 | 2017-10-10 | 中兴通讯股份有限公司 | A kind of method, device and the base station equipment of cell switching |
| CN106488495B (en) * | 2016-10-19 | 2019-07-30 | Oppo广东移动通信有限公司 | Base station selecting method and device based on base station signal quality |
| CN109413701B (en) * | 2017-08-15 | 2020-12-15 | 中国移动通信集团公司 | VoLTE service switching method and system |
| WO2021077293A1 (en) * | 2019-10-22 | 2021-04-29 | 华为技术有限公司 | Communication method and apparatus, and device and system |
| CN112996064B (en) * | 2019-12-18 | 2022-08-05 | 中国移动通信集团浙江有限公司 | Voice fallback method and device |
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| CN101980566A (en) * | 2010-10-26 | 2011-02-23 | 中兴通讯股份有限公司 | Method and system for realizing switching on stand-alone dedicated control channel |
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| CN101778413A (en) * | 2009-12-30 | 2010-07-14 | 华为技术有限公司 | Communication method, base station and communication system |
| CN101980566A (en) * | 2010-10-26 | 2011-02-23 | 中兴通讯股份有限公司 | Method and system for realizing switching on stand-alone dedicated control channel |
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