CN107333305B - Switching method and device suitable for user terminal - Google Patents
Switching method and device suitable for user terminal Download PDFInfo
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- CN107333305B CN107333305B CN201610283429.5A CN201610283429A CN107333305B CN 107333305 B CN107333305 B CN 107333305B CN 201610283429 A CN201610283429 A CN 201610283429A CN 107333305 B CN107333305 B CN 107333305B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The invention discloses a switching method and a device suitable for a user terminal, wherein the switching method sets a call limit parameter requirement to judge a parameter value of a current call, sets a switching limit parameter requirement to judge a parameter value of a target side system, and tries to switch the current call of the user terminal to the target side system if the parameter value of the current call does not accord with the corresponding call limit parameter requirement and the parameter value of the target side system accords with the corresponding switching limit parameter requirement. The method and the device can reduce the call drop rate.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a handover method and apparatus for a user equipment.
Background
The LTE Voice call (Voice over LTE, VoLTE) is a Voice service based on an IP Multimedia Subsystem (IMS), and all services are carried over a 4G network without a 2G/3G network, so that unification of data and Voice services in the same network can be achieved, and the LTE Voice call (VoLTE) is a standard architecture determined by 3GPP and GSMA as mobile Voice. A WiFi Voice service (Voice on WiFi, VoWiFi) is a Voice service based on WiFi.
In the prior art, switching can be performed between VoLTE and VoWiFi, but the switching strategy is incomplete and the call drop rate is high.
Disclosure of Invention
The invention solves the technical problem of reducing the call drop rate of the VoLTE or VoWiFi call.
In order to solve the above technical problem, an embodiment of the present invention provides a handover method applicable to a user terminal, where a current call of the user terminal is any one of the following: carrying out VoLTE call under LTE or VoWiFi call under WiFi; the switching method comprises the following steps: if the parameter value of the current call does not meet the requirement of the corresponding call limit parameter, judging the parameter value of a target side system, wherein the call limit parameter requirement comprises a first lowest signal strength determined by taking no call drop as a standard, and the target side system is a system to be switched to and is selected from LTE and WiFi; if the parameter value of the target side system meets the corresponding switching limit parameter requirement, starting timing, wherein the switching limit parameter requirement comprises: determining a second lowest signal strength according to the first lowest signal strength and a preset signal strength offset; and in the evaluation period when the timing reaches the preset value, if the parameter value of the target side system continuously meets the requirement of the switching limit parameter, switching the current call of the user terminal to the target side system.
Optionally, the call limit parameter requirement further includes a packet error rate threshold, where the packet error rate threshold is a highest packet error rate determined by using a normal call as a standard.
Optionally, the handover limit parameter requirement further includes a handover packet error rate threshold, where the handover packet error rate threshold determines an upper limit of a packet error rate according to the packet error rate threshold and a preset packet error rate offset, and the packet error rate threshold is a highest packet error rate determined by using a normal call as a standard.
Optionally, the call limit parameter requirement or the handover limit parameter requirement includes a requirement determined according to at least one of the following parameters: signal-to-noise ratio, backhaul rate and cyclic redundancy check error rate, LTE parameter signal reception power, LTE parameter signal reception quality.
Optionally, the handover method applicable to the ue further includes: and if the parameter value of the current call meets the corresponding call limit parameter requirement, or the parameter value of the target side system does not meet the corresponding switching limit parameter requirement, closing the started timing.
The embodiment of the invention also provides a switching device suitable for the user terminal, wherein the current call of the user terminal is any one of the following: carrying out VoLTE call under LTE or VoWiFi call under WiFi; the switching device includes: the current call evaluation unit is suitable for judging the parameter value of a target side system when the parameter value of the current call does not accord with the corresponding call limit parameter requirement, the call limit parameter requirement comprises the first lowest signal strength determined by taking no call drop as a standard, and the target side system is a system to be switched to and is selected from LTE and WiFi; the target side system evaluation unit is suitable for starting timing when the parameter value of the target side system meets the corresponding switching limit parameter requirement, and the switching limit parameter requirement comprises the following steps: determining a second lowest signal strength according to the first lowest signal strength and a preset signal strength offset; and the switching unit is suitable for switching the current call of the user terminal to the target side system when the parameter value of the target side system continuously meets the requirement of the switching limit parameter within the preset evaluation period.
Optionally, the call limit parameter requirement further includes a packet error rate threshold, where the packet error rate threshold is a highest packet error rate measured by using a normal call as a standard.
Optionally, the handover limit parameter requirement further includes a handover packet error rate threshold, where the handover packet error rate threshold determines an upper limit of a packet error rate according to the packet error rate threshold and a preset packet error rate offset, and the packet error rate threshold is a highest packet error rate determined by using a normal call as a standard.
Optionally, the call limit parameter requirement or the handover limit parameter requirement includes a requirement determined according to at least one of the following parameters: signal-to-noise ratio, backhaul rate and cyclic redundancy check error rate, LTE parameter signal reception power, LTE parameter signal reception quality.
Optionally, the switching device suitable for the ue further includes: and the timing closing unit is suitable for closing the started timing when the parameter value of the current call meets the requirement of the corresponding call limit parameter or the parameter value of the target side system does not meet the requirement of the corresponding switching limit parameter.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the method comprises the steps of setting a call limit parameter requirement to judge a parameter value of a current call, setting a switching limit parameter requirement to judge a parameter value of a target side system, wherein the call limit parameter requirement comprises a first minimum signal strength determined by taking no call drop as a standard, the switching limit parameter requirement comprises a second minimum signal strength determined according to the first minimum signal strength and a preset signal strength offset, and the first minimum signal strength and the second minimum signal strength both comprise minimum signal strengths set on the premise of taking no call drop as a premise, so that unnecessary switching can be reduced to the maximum extent, the situation that the current call is judged to be required to be switched is reduced, but the call drop caused by the fact that the target side system does not meet a switching condition is reduced, and the call drop rate can be reduced.
Drawings
Fig. 1 is a flowchart of a handover method applicable to a ue in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a handover apparatus suitable for a ue in an embodiment of the present invention.
Detailed Description
As described above, handover between VoLTE and VoWiFi can be performed, but the handover policy is incomplete and the call drop rate is high.
The inventor researches to find that when handover between VoLTE and VoWiFi is completed, the handover strategy can be according to the handover strategy of an operator or the handover strategy of an agreement. Generally, when a handover policy is specified by an operator, handover is performed according to the handover policy of the operator.
However, in the handover strategies specified by the operator or the protocol, some handover procedures may require that the parameter values of LTE and Wi-Fi simultaneously meet a certain threshold, and since the threshold value of the threshold is usually set based on the signal quality itself, it is not set for the purpose of the lowest call drop rate. Therefore, the signal of the access system where the call is located is low enough to possibly cause call drop, while the signal of the other access system meets the standard that the call drop does not occur, but does not reach the requirement threshold of strategy switching, the switching cannot occur, and the call drop is caused.
The embodiment of the invention judges the parameter value of the current call by setting the call limit parameter requirement, judges the parameter value of the target side system by setting the switching limit parameter requirement, and can reduce the call drop rate because the call limit parameter requirement comprises the first minimum signal strength determined by taking the call drop as a standard, the switching limit parameter requirement comprises the second minimum signal strength determined according to the first minimum signal strength and the preset signal strength offset, and both the first minimum signal strength and the second minimum signal strength comprise the minimum signal strength set on the premise of taking the call drop as a premise.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a handover method according to an embodiment of the present invention.
The switching method in the embodiment of the invention is suitable for the user terminal, and the current call of the user terminal is VoLTE call under LTE or VoWiFi call under WiFi, and the switching method comprises the following steps:
and step S11, judging whether the parameter value of the current call meets the requirement of the corresponding call limit parameter, if the parameter value of the current call does not meet the requirement of the corresponding call limit parameter, executing step S12.
The call limit parameter requirements may include requirements for parameter values of a plurality of current calls, and when all of the parameter values of the current calls meet the call limit parameter requirements, it may be determined that the current call is not dropped, that is, the requirements for the parameter values of the current call in the call limit parameter requirements are determined by using normal calls as a standard, for example, may be determined by measuring for a plurality of times without dropping calls as a standard.
In an implementation, the call limit parameter requirement may include a first minimum signal strength, where the first minimum signal strength is determined based on that no call drop occurs, and a call drop occurs if the signal strength of the current call is lower than the first minimum signal strength. It should be noted that the first lowest signal strength is characterized by the network signal strength carrying VoLTE or VoWiFi. More specifically, for VoLTE, the signal strength of the LTE network is characterized; for VoWiFi, the signal strength of the WiFi network is characterized. For example, for VoLTE calls, if the signal strength of the LTE network is below-120 dB, a call drop will occur, and then the first lowest signal strength for VoLTE calls is-120 dB. The handover policy in the prior art may also set a handover threshold to evaluate the current call, and the first lowest signal strength in the embodiment of the present invention is usually lower than the handover threshold specified by the handover policy in the prior art.
In a specific implementation, the call limit parameter requirement further includes a packet error rate threshold, where the packet error rate threshold is a highest packet error rate determined based on a normal call. In the prior art, the handover strategy does not generally consider the packet error rate, and is made only from the signal strength. However, even if the signal strength is high and the call is not interrupted, the normal call cannot be performed if the packet error rate is high. Therefore, in the embodiment of the invention, the packet error rate threshold is used as one of the requirements of the call limit parameters, when the packet error rate of the current call is higher than the packet error rate threshold, the normal call cannot be performed, and the current call is tried to be switched, so that the call quality can be ensured.
In another specific implementation, the call limit parameter requirement may be a requirement determined according to any one or more of a Signal-to-Interference plus Noise Ratio (SINR), a Backhaul Rate (Backhaul Rate), a Cyclic Redundancy Check (CRC) error Rate, a LTE Reference Signal Receiving Power (RSRP), and a LTE Reference Signal Receiving Quality (RSRQ), wherein:
when the current call is a VoWiFi call, the call limit parameter requirement can be determined according to one or more of RSSI, SINR, backhaul rate and CRC error rate; when the current call is a VoLTE call, the call limit parameter requirement may be determined from one or more of RSRP, RSRQ, and CRC error rate.
Since parameters such as RSSI, SINR, backhaul rate, CRC error rate, RSRP, and RSRQ all relate to call quality, call quality of the user terminal can be ensured by determining call limit parameter requirements using one or more of the above parameters as needed.
Step S12, determining whether the parameter value of the target-side system meets the corresponding switching limit parameter requirement, and if the parameter value of the target-side system meets the corresponding switching limit parameter requirement, executing step S13.
In a specific implementation, the target-side system may be LTE or WiFi, and when the current call is VoLTE, the target-side system may be WiFi; when the current call is VoWiFi, the target-side system may be LTE.
In a specific implementation, the handoff limit parameter requirement of the target-side system may be determined by the call limit parameter requirement plus an offset of the system when the system is used as the current call system. For example, the handover limit parameter requirement may comprise a second lowest signal strength, i.e. a signal strength determined from the first lowest signal strength and a preset signal strength offset.
The offset is set to reserve a certain margin to prevent the ping-pong effect of the original system caused by the re-switching after the current call is switched to the target side system, and to ensure the stability after the call is switched. Specifically, when the parameter value is the signal strength, the offset may be set to 3dB to 5dB, the ping-pong effect may be avoided by setting the offset within the range, and the handover failure and the call drop caused thereby may be caused by too high offset that may be set.
In an embodiment of the present invention, when the LTE system is used as a current call system, the first minimum signal strength is-120 dB, and the second minimum signal strength may be set between-117 dB and-115 dB.
The second lowest signal strength in the embodiment of the invention is usually lower than the signal strength switching threshold specified in the existing protocol switching strategy so as to cover the situation that the current protocol can not cover the switching but can not successfully switch, thereby ensuring the smooth switching of the current conversation and further reducing the call drop rate.
In a specific implementation, the handover limit parameter requirement may further include a handover packet error rate threshold, where the handover packet error rate threshold is a maximum packet error rate determined according to the packet error rate threshold and a preset packet error rate offset, and the packet error rate threshold is a maximum packet error rate determined by using a normal call as a standard. As described above, the packet error rate is also an important parameter for ensuring normal communication, and the packet error rate of the target side system is considered, so that the situation that normal communication cannot be performed even if the target side system is switched to due to too high packet error rate of the target side system can be avoided, and further terminal resources can be saved, and the communication quality after switching can be ensured.
Similar to the requirement of the call limit parameter, in a specific implementation, the requirement of the handover limit parameter may also be determined according to one or more of the parameters of RSSI, SINR, backhaul rate, CRC error rate, RSRP, RSRQ, and the like, so as to ensure the call quality after the handover of the user equipment.
And step S13, starting timing, and switching the current call of the user terminal to the target side system if the parameter value of the target side system continuously meets the requirement of the switching limit parameter within the preset evaluation period.
The timing can be started by a timer. By setting timing, the current call of the user terminal is switched to the target side system when the parameter value of the target side system continuously meets the requirement of the switching limit parameter, so that the ping-pong effect can be avoided. In a specific implementation, the evaluation period may be set at 0-7 seconds, for example:
when the current call is a VoLTE call, if the parameter value of the VoLTE does not accord with the requirement of the corresponding call limit parameter and the parameter value of the VoWiFi accords with the requirement of the corresponding switching limit parameter within 0-7 seconds, immediately triggering the VoLTE to be switched to the VoWiFi whether the VoWiFi and the VoLTE switching strategies specified by an operator/3 GPP protocol are met or not; when the current call is VoWiFi, if the parameter value of the VoWiFi does not accord with the corresponding call limit parameter requirement and the parameter value of the VoLTE accords with the corresponding switching limit parameter requirement within 0-7 seconds, the switching of the VoWiFi to the VoLTE is immediately triggered no matter whether the VoWiFi and VoLTE switching strategies regulated by an operator/3 GPP protocol are met or not.
In some existing handover strategies, the timing setting in some strategies is too long, for example, in the handover strategy of the chinese telecommunications, it is specified that the call of the user terminal needs to be switched back to VoLTE after being switched from VoLTE to volga for more than 60s, and the call of the user terminal needs to be switched back to VoLTE after being switched from volga to VoLTE for more than 60s, which may cause that in 60s, although the target side system can perform normal call, the target side system cannot be switched, and call drop occurs.
In the embodiment of the invention, the switching of the current call of the user terminal does not need to simultaneously meet the switching strategy of the network side or the operator which is currently applicable to the terminal, and the switching of the user terminal when the switching strategy of the network side or the operator which is currently applicable is not prevented, so the switching method in the embodiment of the invention can be compatible with the existing switching strategy, and can make up the defects of the existing switching strategy.
In a specific implementation, the handover method may further include: if the parameter value of the current call is found to meet the requirement of the corresponding call limit parameter by the step S11, or the parameter value of the target side system is found to not meet the requirement of the corresponding handover limit parameter by the step S12, the started timer is turned off in the step S14, so as to save terminal resources.
The embodiment of the invention sets the call limit parameter requirement to judge the parameter value of the current call, sets the switching limit parameter requirement to judge the parameter value of the target side system, and can reduce the call drop rate because the call limit parameter requirement comprises the first minimum signal strength determined by taking the call drop as a standard, the switching limit parameter requirement comprises the second minimum signal strength determined according to the first minimum signal strength and the preset signal strength offset, and the first minimum signal strength and the second minimum signal strength both comprise the minimum signal strength set on the premise of taking the call drop as a premise, thereby reducing unnecessary switching to the maximum extent, further reducing the call drop caused by the fact that the current call is judged to be required to be switched but the target side system does not meet the switching condition.
The embodiment of the invention also provides a switching device, and the structural schematic diagram of the switching device is shown in fig. 2.
The switching device shown in fig. 2 is suitable for a user terminal performing a VoLTE call under LTE or a VoWiFi call under WiFi, and the switching device may include:
the current call evaluation unit 21 is adapted to judge a parameter value of a target side system when the parameter value of the current call does not meet a corresponding call limit parameter requirement, wherein the call limit parameter requirement comprises a first lowest signal strength determined by taking no call drop as a standard, and the target side system is a system to be switched to and is selected from LTE and WiFi;
the target-side system evaluation unit 22 is adapted to start timing when the parameter value of the target-side system meets a corresponding switching limit parameter requirement, where the switching limit parameter requirement includes: determining a second lowest signal strength according to the first lowest signal strength and a preset signal strength offset;
the switching unit 23 is adapted to switch the current call of the user terminal to the target side system when the parameter value of the target side system continuously meets the requirement of the switching limit parameter within a preset evaluation period.
In a specific implementation, the call limit parameter requirement may further include a packet error rate threshold, where the packet error rate threshold is a highest packet error rate measured with a normal call as a standard.
In a specific implementation, the switching limit parameter requirement may further include a switching packet error rate threshold, where the switching packet error rate threshold is a maximum packet error rate determined according to the packet error rate threshold and a preset packet error rate offset, and the packet error rate threshold is a maximum packet error rate determined by using a normal call as a standard.
In a specific implementation, the call limit parameter requirement or the handover limit parameter requirement may include a requirement determined according to at least one of the following parameters: signal-to-noise ratio, backhaul rate and cyclic redundancy check error rate, LTE parameter signal reception power, LTE parameter signal reception quality.
In a specific implementation, the handover apparatus of the ue may further include: and a timing closing unit 24, adapted to close the started timing when the parameter value of the current call meets the requirement of the corresponding call limit parameter, or when the parameter value of the target-side system does not meet the requirement of the corresponding handover limit parameter.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A switching method suitable for a user terminal is characterized in that the current conversation of the user terminal is any one of the following: carrying out VoLTE call under LTE or VoWiFi call under WiFi; the switching method comprises the following steps:
if the parameter value of the current call does not meet the requirement of the corresponding call limit parameter, judging the parameter value of a target side system, wherein the call limit parameter requirement comprises a first lowest signal strength determined by taking no call drop as a standard, and the target side system is a system to be switched to and is selected from LTE and WiFi;
if the parameter value of the target side system meets the corresponding switching limit parameter requirement, starting timing, wherein the switching limit parameter requirement comprises: determining a second lowest signal strength according to the first lowest signal strength and a preset signal strength offset; the first lowest signal strength is lower than a signal strength switching threshold corresponding to an existing switching strategy, and the second lowest signal strength is lower than the signal strength switching threshold;
and in the evaluation period when the timing reaches the preset value, if the parameter value of the target side system continuously meets the requirement of the switching limit parameter, switching the current call of the user terminal to the target side system.
2. The handover method for a ue of claim 1, wherein the call limit parameter further comprises a packet error rate threshold, and the packet error rate threshold is a highest packet error rate determined based on normal calls.
3. The handover method according to claim 1, wherein the handover margin parameter requirement further includes a handover packet error rate threshold, the handover packet error rate threshold is a packet error rate upper limit determined according to the packet error rate threshold and a preset packet error rate offset, and the packet error rate threshold is a maximum packet error rate determined according to a normal call.
4. The handover method for a ue according to claim 1, wherein the call limit parameter requirement or the handover limit parameter requirement comprises a requirement determined according to at least one of the following parameters: signal-to-noise ratio, backhaul rate and cyclic redundancy check error rate, LTE parameter signal reception power, LTE parameter signal reception quality.
5. The handover method for a ue according to claim 1, further comprising: and if the parameter value of the current call meets the corresponding call limit parameter requirement, or the parameter value of the target side system does not meet the corresponding switching limit parameter requirement, closing the started timing.
6. A switching device suitable for a user terminal is characterized in that the current conversation of the user terminal is any one of the following: carrying out VoLTE call under LTE or VoWiFi call under WiFi; the switching device includes:
the current call evaluation unit is suitable for judging the parameter value of a target side system when the parameter value of the current call does not accord with the corresponding call limit parameter requirement, the call limit parameter requirement comprises the first lowest signal strength determined by taking no call drop as a standard, and the target side system is a system to be switched to and is selected from LTE and WiFi;
the target side system evaluation unit is suitable for starting timing when the parameter value of the target side system meets the corresponding switching limit parameter requirement, and the switching limit parameter requirement comprises the following steps: determining a second lowest signal strength according to the first lowest signal strength and a preset signal strength offset; the first lowest signal strength is lower than a signal strength switching threshold corresponding to an existing switching strategy, and the second lowest signal strength is lower than the signal strength switching threshold;
and the switching unit is suitable for switching the current call of the user terminal to the target side system when the parameter value of the target side system continuously meets the requirement of the switching limit parameter within the preset evaluation period.
7. The handover apparatus according to claim 6, wherein the call limit parameter further comprises a packet error rate threshold, and the packet error rate threshold is the highest packet error rate measured with respect to a normal call.
8. The handover apparatus of claim 6, wherein the handover margin parameter further comprises a handover packet error rate threshold, the handover packet error rate threshold is a packet error rate upper limit determined according to the handover packet error rate threshold and a preset packet error rate offset, and the handover packet error rate threshold is a maximum packet error rate determined according to a normal call.
9. The handover apparatus of claim 6, wherein the call limit parameter requirement or the handover limit parameter requirement comprises a requirement determined according to at least one of the following parameters: signal-to-noise ratio, backhaul rate and cyclic redundancy check error rate, LTE parameter signal reception power, LTE parameter signal reception quality.
10. The handover apparatus for a ue according to claim 6, further comprising: and the timing closing unit is suitable for closing the started timing when the parameter value of the current call meets the requirement of the corresponding call limit parameter or the parameter value of the target side system does not meet the requirement of the corresponding switching limit parameter.
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| CN109769273A (en) * | 2018-12-07 | 2019-05-17 | 深圳市海派通讯科技有限公司 | Method and system based on the control VoWifi switching of RTP delay variation |
| CN110099421B (en) * | 2019-04-29 | 2021-08-24 | 维沃移动通信有限公司 | Signal processing method and device and terminal equipment |
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| CN101193413B (en) * | 2006-11-22 | 2010-07-28 | 大唐移动通信设备有限公司 | A multi-network mode switching method and its communication device |
| CN101888680B (en) * | 2009-05-11 | 2013-03-27 | 联芯科技有限公司 | Method for reelecting/switching 2G mode into 3G mode and dual-mode single-standby terminal device |
| CN102572990B (en) * | 2012-02-28 | 2016-08-03 | 华为终端有限公司 | The method of multimode switching and multimode terminal |
| KR102278510B1 (en) * | 2014-03-26 | 2021-07-16 | 삼성전자주식회사 | Apparatus and method for serving voice in a wireless network |
| CN106664616B (en) * | 2014-07-07 | 2020-09-04 | 瑞典爱立信有限公司 | Resolving contention handover conditions in a wireless network |
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