CN102711171B - Method and device for deleting branch - Google Patents
Method and device for deleting branch Download PDFInfo
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- CN102711171B CN102711171B CN201210161698.6A CN201210161698A CN102711171B CN 102711171 B CN102711171 B CN 102711171B CN 201210161698 A CN201210161698 A CN 201210161698A CN 102711171 B CN102711171 B CN 102711171B
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Abstract
The invention relates to a method and a device for deleting a branch. The method comprises the following steps: receiving pilot frequency strength measuring information transmitted by a mobile terminal, wherein indicating information for deleting at least one branch is carried in the pilot frequency strength measuring information; determining whether the quality of a reverse link of one branch in other branches except the at least one branch in a branch activation set of the mobile terminal meets a predetermined threshold, if so, determining to delete the at least one branch; if no, further determining whether the quality of the reverse link of the at least one branch meets the predetermined threshold, if so, determining to keep the at least one branch, and if not, determining to delete the at least one branch. According to the invention, deletion of one branch can be determined according to qualities of a forward link and the reverse link of each branch, and dropped calls due to deletion of the branches can be reduced.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of method and apparatus deleting branch.
Background technology
Code division multiple access (Code Division Multiple Access, CDMA) communication system has soft handover function, when soft handover refers to that travelling carriage enters another community from a community, first set up the communication with new base station, until receive former base station signal lower than cutting off a kind of switching mode with the communication link of former base station during a threshold value again.Soft switching process ensure that the continuity of information transmission in handoff procedure.Soft handover function makes there is multiple forward direction and reverse unbalanced branch in branch's Active Set of cdma network, namely branch's forward link well but reverse link bad, but or the bad reverse link of branch's forward link good.In such a scenario, if handoff procedure carries out bad, probably cause the overload of branch and the call drop of travelling carriage, network quality is declined greatly.So-called branch refers to the wireless link (comprising forward link and direction link) between base station and mobile terminal, and the English name of branch is leg.
Under the prior art, cdma system increases and that delete branch is all Ec/Io (the Pilot energy accumulated over one PN chip periodto the total power spectral desity in the received bandwidth of the forward link of each branch reported according to travelling carriage, the signal to noise ratio of pilot signal), and do not consider the quality of the quality of its reverse link.When the forward link of branch multiple in Active Set and reverse link circuit quality uneven time, if but only just likely delete the good branch of the bad reverse link of forward link according to the Ec/Io of forward link, this can cause remaining branch reverse strand to pass by difference and call drop.
Summary of the invention
Embodiments provide a kind of method and apparatus, determine whether deleting certain branch with the quality realized in conjunction with reverse link under terminal request deletes the scene of branch, but effectively reduce the call drop caused owing to deleting the good branch of the bad reverse link of forward link.
On the one hand, embodiments provide a kind of method of deleting branch, described method comprises:
The Pilot Strength Measurement Message that mobile terminal receive sends, carries the indication information deleting at least one branch in described Pilot Strength Measurement Message;
Determine whether have the quality of the reverse link of a branch to meet default threshold value in other branches in branch's Active Set of described mobile terminal except at least one branch described, if so, then determine to delete at least one branch described;
If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value further, if so, then determine to retain at least one branch described; If not, then determine to delete at least one branch described.
On the other hand, embodiments provide a kind of device deleting branch, described device comprises:
Receiver, for the Pilot Strength Measurement Message that mobile terminal receive sends, carries the indication information deleting at least one branch in described Pilot Strength Measurement Message;
First processor, for determine described mobile terminal branch's Active Set in whether have the quality of the reverse link of a branch to meet default threshold value in other branches except at least one branch described, if so, then determine to delete at least one branch described; If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value further, if so, then determine to retain at least one branch described; If not, then determine to delete at least one branch described.
In the embodiment of the present invention, under soft handover scenario, after the Pilot Strength Measurement Message of at least one branch is deleted in the instruction that base station controller receives mobile terminal reporting, first determine whether have the quality of the reverse link of a branch to meet default threshold value in other branches in branch's Active Set of described mobile terminal except at least one branch described, if so, then determine to delete at least one branch described; If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value, if so, then determines to retain this at least one branch, otherwise determines to delete this at least one branch further.The embodiment of the present invention achieves and can determine whether to delete this at least one branch according to the quality of the reverse link of each branch when terminal request deletes at least one branch thus, but effectively reduces the call drop caused owing to deleting the good branch of the bad reverse link of forward link.
Accompanying drawing explanation
A kind of application scenarios schematic diagram deleting the method for branch that Fig. 1 provides for the embodiment of the present invention;
A kind of method flow diagram deleting branch that Fig. 2 provides for the embodiment of the present invention;
A kind of device schematic diagram deleting branch that Fig. 3 provides for the embodiment of the present invention.
Embodiment
In below describing, in order to illustrate instead of in order to limit, propose the detail of such as particular system structure, interface, technology and so on, understand the present invention thoroughly to cut.But, it will be clear to one skilled in the art that and also can realize the present invention in other embodiment not having these details.In other situation, omit the detailed description to well-known device, circuit and method, in order to avoid unnecessary details hinders description of the invention.
A kind of application scenarios schematic diagram deleting the method for branch that Fig. 1 provides for the embodiment of the present invention.The method and apparatus of the deletion branch that the embodiment of the present invention provides is when practical application, and a kind of method as deletion branch newly can be applicable to the scene of all soft handovers or More Soft Handoff.Suppose in branch's Active Set of mobile terminal, to there is two or more forward link and the unbalanced branch of reverse link, under mobile terminal is in this kind of scene, may need to delete branch.Embodiments provide base station controller under soft handover scenario and make the method for deleting branch's judgement.As shown in Figure 1, mobile terminal is in and prepares to be switched to branch's A condition from branch B, suppose that solid line represents that link-quality is good, dotted line represents that link-quality is poor, the forward link quality of the branch A so as seen in Figure 1 between mobile terminal and base station A well but reverse link circuit quality is bad, but and the bad reverse link circuit quality of forward link quality of branch B between mobile terminal and base station B is good.When the pilot frequency intensity of the forward link of branch B deletes threshold value lower than soft handover, mobile terminal reports Pilot Strength Measurement Message (PilotStrength Measurement Message by base station A and base station B to base station controller BSC, PSMM) request is deleted after this branch B, BSC receive described PSMM message and can be judged whether to delete this branch B according to the quality of branch A and branch B reverse link.
The techniques described herein may be used in the wireless communication system that there is soft handover and More Soft Handoff, such as code division multiple access (CDMA, Code Division Multiple Access) system, Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code Division Multiple Access Wireless), and the system of other these type of communication systems or some evolution based on this type systematic.
In conjunction with mobile terminal, base station and base station controller, various aspect is described herein.
Above-mentioned mobile terminal can be Personal Communications Services (PCS, Personal CommunicationService) phone, cordless telephone, Session initiation Protocol (SIP) phone, wireless local loop (WLL, Wireless Local Loop) stand, the equipment such as personal digital assistant (PDA, Personal Digital Assistant).Mobile terminal can also be subscri er unit (Subscriber Unit), subscriber station (SubscriberStation), travelling carriage (Mobile Station), distant station (Remote Station), access point (Access Point), remote terminal (Remote Terminal), access terminal (AccessTerminal), user agent (User Agent), subscriber equipment (User Device) or subscriber's installation (User Equipment) etc.
Base station can be the base station (BTS in GSM or CDMA, Base Transceiver Station), also can be the base station (NodeB) in WCDMA, can also be evolved base station (NodeB or eNB or e-NodeB in E-UTRA, evolutional Node B), the present invention does not limit.
Base station controller, can be the base station controller (BSC, base stationcontroller) in GSM or CDMA, also can be the radio network controller (RNC in WCDMA, Radio NetworkController) etc., the present invention does not limit.
Embodiments provide a kind of method and apparatus deleting branch.Under soft handover scenario, after the Pilot Strength Measurement Message of at least one branch is deleted in the instruction that base station controller receives mobile terminal reporting, first determine whether have the quality of the reverse link of a branch to meet default threshold value in other branches in branch's Active Set of described mobile terminal except at least one branch described, if so, then determine to delete at least one branch described; If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value, if so, then determines to retain this at least one branch, otherwise determines to delete this at least one branch further.The embodiment of the present invention achieves and can determine whether to delete this at least one branch according to the quality of the reverse link of each branch when terminal request deletes at least one branch thus, but effectively reduces the call drop caused owing to deleting the good branch of the bad reverse link of forward link.
A kind of method flow diagram deleting branch that Fig. 2 provides for the embodiment of the present invention.The executive agent of this embodiment can be base station controller, which describes in detail that base station controller determines whether to delete the method for the branch that terminal request is deleted according to the quality of the reverse link of each branch.As shown in Figure 2, the present embodiment comprises the following steps:
Step 201, the Pilot Strength Measurement Message that base station controller mobile terminal receive sends, carries the indication information deleting at least one branch in described Pilot Strength Measurement Message.
Described Pilot Strength Measurement Message is that described mobile terminal detects that the pilot frequency intensity of the forward link of at least one branch described sends lower than during PilotDrop threshold value.Such as, suppose in branch's Active Set of mobile terminal, to have two or more front reverse unbalanced branch, and when the pilot frequency intensity of the forward link of one of them branch is less than PilotDrop threshold value T_DROP, what mobile terminal started this branch abandons timer, when the timing abandoning timer exceed abandon thresholding T_TDROP that timer specifies time, mobile terminal can send Pilot Strength Measurement Message PSMM to ask to delete described branch to base station, the PSMM received is transmitted to base station controller by base station.
The pilot frequency intensity of each branch can represent with Ec/Io (ENERGY E c and reception total Spectral Density---the ratio of noise plus signal of a bit).
Step 202, base station controller determines whether have the quality of the reverse link of a branch to meet default threshold value in other branches in branch's Active Set of described terminal except at least one branch described, if so, then determines to delete at least one branch described; If not, then step 203 is performed.
The pilot frequency intensity of the forward link of each branch and the value of branch reservation indication information KEEP is given in PSMM message, KEEP value is that 1 expression retains corresponding branch, KEEP value be 1 branch's pilot frequency intensity of comprising forward link be more than or equal to the branch of T_DROP, but or the pilot frequency intensity of forward link be less than T_DROP duration and do not exceed the branch abandoning the thresholding T_TDROP that timer specifies; KEEP value is that 0 expression needs to delete corresponding branch, KEEP value be 0 branch's pilot frequency intensity of comprising forward link be less than T_DROP's and duration exceedes the branch abandoning the thresholding T_TDROP that timer specifies.
The detailed embodiment of the present invention describes in detail mainly for the situation carrying the indication information deleting at least one branch in PSMM message.If mobile terminal deletes at least one branch by PSMM message request, then first base station controller determines in branch's Active Set of described mobile terminal, KEEP value is whether have the quality of the reverse link of a branch to meet default threshold value in the branch of 1, namely whether the quality of reverse link is relatively good, if at least one branch described then can be deleted.
Before the operation carrying out this step, base station controller can also arrange described threshold value, is used for the quality of quality of the reverse link weighing each branch.If the quality of the reverse link of branch is more than or equal to described threshold value, then illustrate that the mass ratio of the reverse link of this branch is better; Otherwise illustrate that the quality of the reverse link of this branch is too poor.
The quality of the reverse link of branch specifically can be embodied by the parameter of assessing link quality; the parameter of described assessing link quality can comprise in the parameters such as frame error rate, pilot strength value, signal to noise ratio one or more, the supplemental characteristic of assessing link quality that what those skilled in the art can be suitable be used for is all in protection scope of the present invention.Such as, when the parameter of assessing link quality be pilot frequency intensity and frame error rate time, described threshold value can comprise pilot frequency intensity threshold value and frame error rate threshold value, if the value of the pilot frequency intensity of reverse link is more than or equal to described pilot frequency intensity threshold value, and its frame error rate is also less than described frame error rate threshold value, then illustrate that the quality of this direction link meets described threshold value, namely the mass ratio of link is better.The data of assessing link quality can be monitored by corresponding base station, and send to base station controller.
Other branches one or more can also be had except the branch that described mobile terminal request is deleted in branch's Active Set of mobile terminal, when other branches have multiple, whether base station controller has at least the quality of the reverse link of a branch to meet default threshold value by other branches described for judgement, if, then at least one branch that described mobile terminal request is deleted deleted by described base station controller, namely extended handoff direction messages is sent to described mobile terminal, be used to indicate at least one branch described that described mobile terminal deletes the deletion of described mobile terminal request, if not, then step 203 is performed.
Step 203, base station controller determines whether the quality of the reverse link of at least one branch described meets described default threshold value further, if so, then determines to retain at least one branch described; If not, then determine to delete at least one branch described.
Base station controller is when the quality of the reverse link determining other branches except at least one branch that described mobile terminal request is deleted all is less than default threshold value, whether the quality continuing the reverse link determining at least one branch described in mobile terminal request deletion is met the threshold value preset, if, then illustrate that the quality of the reverse link of at least one branch that mobile terminal request is deleted is better, then the judgement of not deleting this at least one branch made by base station controller, namely extended handoff direction messages is sent to described mobile terminal, be used to indicate at least one branch described that described mobile terminal does not delete the deletion of described mobile terminal request.
If base station controller determines that the quality of the reverse link being moved at least one branch described that terminal request is deleted is less than threshold value, illustrate that the quality of the reverse link of at least one branch described that mobile terminal request is deleted is also bad, now base station controller can delete this at least one branch, namely send extended handoff direction messages to mobile terminal, this at least one branch deletes by indicating mobile terminal from branch's Active Set.
In the embodiment of the present invention, after the Pilot Strength Measurement Message of at least one branch is deleted in the instruction that base station controller receives mobile terminal reporting, first determine whether the quality of the reverse link whether having a branch to sentence in other branches in branch's Active Set of described mobile terminal except at least one branch described meets the threshold value preset, if so, then determine to delete at least one branch described; If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value, if so, then determines to retain this at least one branch, otherwise determines to delete this at least one branch further.The embodiment of the present invention achieves and can determine whether to delete this at least one branch according to the quality of the reverse link of each branch when terminal request deletes at least one branch thus, but effectively reduces the call drop caused owing to deleting the good branch of the bad reverse link of forward link.
Correspondingly, the embodiment of the present invention additionally provides a kind of device deleting branch.A kind of device schematic diagram deleting branch that Fig. 3 provides for the embodiment of the present invention.The main body of this embodiment is base station controller, which describes in detail that each functional module in base station controller determines whether to delete at least one ramifying of terminal request deletion according to the quality of the reverse link of each branch.As shown in Figure 3, the present embodiment comprises with lower unit:
Receiver 301, for the Pilot Strength Measurement Message that mobile terminal receive sends, carries the indication information deleting at least one branch in described Pilot Strength Measurement Message.
Described Pilot Strength Measurement Message is that described mobile terminal detects that the pilot frequency intensity of the forward link of at least one branch described sends lower than during PilotDrop threshold value.Such as, suppose in branch's Active Set of mobile terminal, to have two or more front reverse unbalanced branch, and when the pilot frequency intensity of the forward link of one of them branch is less than PilotDrop threshold value T_DROP, what mobile terminal started this branch abandons timer, when the timing abandoning timer exceed abandon thresholding T_TDROP that timer specifies time, mobile terminal can send Pilot Strength Measurement Message PSMM to ask to delete described branch to base station, the PSMM received is transmitted to base station controller by base station, and base station controller can receive PSMM message thus.
First processor 302, for determine described terminal branch's Active Set in whether have the quality of the reverse link of a branch to meet default threshold value in other branches except at least one branch described, if so, then determine to delete at least one branch described; If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value further, if so, then determine to retain at least one branch described; If not, then determine to delete at least one branch described.
If mobile terminal request deletes at least one branch, the quality of the reverse link of a branch whether is had to meet default threshold value in other branches that then first first processor 302 judges in branch's Active Set of described mobile terminal except at least one branch described, namely KEEP value is the whether satisfied threshold value preset of quality of the reverse link of the branch of 1, if words, then illustrate that the mass ratio of other branch's reverse links is better, at least one branch described that described mobile terminal request is deleted can be deleted.
Preferably, the embodiment of the present invention also comprises: the second processor 303, for arranging described threshold value.
Described threshold value is used for the quality of quality of the reverse link weighing each branch.If the quality of the reverse link of branch is more than or equal to described threshold value, then illustrate that the mass ratio of the reverse link of this branch is better; Otherwise illustrate that the quality of the reverse link of this branch is too poor.
The quality of the reverse link of branch specifically can be embodied by the parameter of assessing link quality; the parameter of described assessing link quality can comprise in the parameters such as frame error rate, pilot strength value, signal to noise ratio one or more, the parameter of assessing link quality that what those skilled in the art can be suitable be used for is all in protection scope of the present invention.Such as, when the parameter of assessing link quality be pilot frequency intensity and frame error rate time, described threshold value can comprise pilot frequency intensity threshold value and frame error rate threshold value, if the value of the pilot frequency intensity of reverse link is more than or equal to described pilot frequency intensity threshold value, and its frame error rate is also less than described frame error rate threshold value, then illustrate that the quality of this direction link meets described threshold value, then illustrate that the mass ratio of this link is better.The data of assessing link quality can be monitored by corresponding base station, and send to base station controller, are received by the receiver 301 of base station controller.
Other branches one or more can also be had except the branch that described mobile terminal request is deleted in branch's Active Set of mobile terminal, when other branches have multiple, whether first processor 302 has at least the quality of the reverse link of a branch to meet default threshold value by other branches described for judgement, if so, then described first processor 302 is determined to delete at least one branch described; If not, then described first processor 302 determines whether the quality of the reverse link of at least one branch described meets described default threshold value further, if so, then retains at least one branch described; If not, then determine to delete at least one branch described.
The device of the embodiment of the present invention can also comprise: transmitter 304, specifically for: after first processor 302 determines to retain at least one branch described, send extended handoff direction messages to described mobile terminal, be used to indicate at least one branch described that described mobile terminal does not delete the deletion of described mobile terminal request.
Or,
Transmitter 304 specifically for: after first processor 302 determines to delete at least one branch described, send extended handoff direction messages to described mobile terminal, be used to indicate at least one branch described that described mobile terminal deletes the deletion of described mobile terminal request.
The first processor 302 of base station controller is when the quality of the reverse link determining at least one branch described in mobile terminal request deletion is less than or equal to default threshold value, whether the quality continuing the reverse link determining at least one branch described is more than or equal to described default threshold value, if, then illustrate that the reverse link circuit quality of at least one branch described that mobile terminal request is deleted is better, then first processor 302 is determined to retain this at least one branch, namely extended handoff direction messages is sent by transmitter 304 to described mobile terminal, be used to indicate at least one branch described that described mobile terminal does not delete the deletion of described mobile terminal request.
If the first processor of base station controller 302 determines that the quality of the reverse link being moved at least one branch described that terminal request is deleted is less than described default threshold value, the poor quality of the reverse link of the branch that mobile terminal request is deleted then is described, now first processor 302 is determined to delete this at least one branch, namely send extended handoff direction messages by transmitter 304 to mobile terminal, this branch deletes by indicating mobile terminal from Active Set.
In the embodiment of the present invention, after the Pilot Strength Measurement Message of at least one branch is deleted in the instruction that base station controller receives mobile terminal reporting, first determine whether have the quality of the reverse link of a branch to meet default thresholding in other branches in branch's Active Set of described mobile terminal except at least one branch described, if so, then determine to delete at least one branch described; If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value, if so, then determines to retain this at least one branch, otherwise determines to delete this at least one branch further.The embodiment of the present invention achieves when terminal request deletes at least one branch and can determine whether to delete this at least one branch according to the quality of the reverse link of each branch thus, but effectively reduces the call drop caused owing to deleting the good branch of the bad reverse link of forward link.
Professional should recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. delete a method for branch, it is characterized in that, described method comprises:
The Pilot Strength Measurement Message that mobile terminal receive sends, carries the indication information deleting at least one branch in described Pilot Strength Measurement Message;
Determine whether have the quality of the reverse link of a branch to meet default threshold value in other branches in branch's Active Set of described mobile terminal except at least one branch described, if so, then determine to delete at least one branch described;
If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value further, if so, then determine to retain at least one branch described; If not, then determine to delete at least one branch described;
Described determine to delete at least one branch described after comprise further: send extended handoff direction messages to described mobile terminal, be used to indicate described mobile terminal and delete at least one branch described;
Described determine to retain at least one branch described after comprise further: send extended handoff direction messages to described mobile terminal, be used to indicate described mobile terminal and do not delete at least one branch described.
2. method according to claim 1, it is characterized in that, whether have in described other branches determined in branch's Active Set of described mobile terminal except at least one branch described the quality of the reverse link of a branch meet default threshold value before also comprise: described threshold value is set.
3. the method according to claim 1-2 any one, it is characterized in that, the quality of described reverse link embodies especially by the parameter of assessing link quality, the parameter of described assessing link quality comprise in frame error rate, pilot strength value and signal to noise ratio one or more.
4. delete a device for branch, it is characterized in that, described device comprises:
Receiver, for the Pilot Strength Measurement Message that mobile terminal receive sends, carries the indication information deleting at least one branch in described Pilot Strength Measurement Message;
First processor, for determine described mobile terminal branch's Active Set in whether have the quality of the reverse link of a branch to meet default threshold value in other branches except at least one branch described, if so, then determine to delete at least one branch described; If not, then determine whether the quality of the reverse link of at least one branch described meets described default threshold value further, if so, then determine to retain at least one branch described; If not, then determine to delete at least one branch described;
Described device also comprises: transmitter, for determine to delete at least one branch described at described first processor after, sends extended handoff direction messages to described mobile terminal, is used to indicate described mobile terminal and deletes at least one branch described;
Described device also comprises: transmitter, for determine to retain at least one branch described at described first processor after, sends extended handoff direction messages to described mobile terminal, is used to indicate described mobile terminal and does not delete at least one branch described.
5. device according to claim 4, is characterized in that, described device also comprises: the second processor, for arranging described threshold value.
6. the device according to claim 4-5 any one, it is characterized in that, the quality of described reverse link embodies especially by the parameter of assessing link quality, the parameter of described assessing link quality comprise in frame error rate, pilot strength value and signal to noise ratio one or more.
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| CN201210161698.6A CN102711171B (en) | 2012-05-23 | 2012-05-23 | Method and device for deleting branch |
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| CN201210161698.6A CN102711171B (en) | 2012-05-23 | 2012-05-23 | Method and device for deleting branch |
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| CN102711171B true CN102711171B (en) | 2015-07-22 |
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| CN110611620B (en) * | 2019-09-29 | 2021-11-05 | 新华三信息安全技术有限公司 | Link updating method and device |
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| CN1378357A (en) * | 2001-04-04 | 2002-11-06 | 华为技术有限公司 | Method for soft switching subzone of mobile station in CDMA communication system |
| EP1589780A1 (en) * | 2000-04-07 | 2005-10-26 | Motorola, Inc. | Method and apparatus for soft handoff in a communication system operating according to multiple communication standards |
| CN1792100A (en) * | 2003-05-16 | 2006-06-21 | 摩托罗拉公司 | Method and apparatus for performing a soft-handoff |
| CN101547477A (en) * | 2008-03-25 | 2009-09-30 | 华为技术有限公司 | Method and device for controlling carrier frequency of multi-carrier/subdistrict system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1589780A1 (en) * | 2000-04-07 | 2005-10-26 | Motorola, Inc. | Method and apparatus for soft handoff in a communication system operating according to multiple communication standards |
| CN1378357A (en) * | 2001-04-04 | 2002-11-06 | 华为技术有限公司 | Method for soft switching subzone of mobile station in CDMA communication system |
| CN1792100A (en) * | 2003-05-16 | 2006-06-21 | 摩托罗拉公司 | Method and apparatus for performing a soft-handoff |
| CN101547477A (en) * | 2008-03-25 | 2009-09-30 | 华为技术有限公司 | Method and device for controlling carrier frequency of multi-carrier/subdistrict system |
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