CN102487537B - Method for selecting target base station (BS) during switching and system thereof - Google Patents
Method for selecting target base station (BS) during switching and system thereof Download PDFInfo
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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
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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Abstract
The invention discloses a method for selecting a target base station (BS) during switching. The method comprises the following steps that: after receiving a resource request message of a service BS and preparing the resources for a mobile station (MS), a candidate BS sends a response message including resource reservation timer duration to the service BS; the service BS stores the received resource reservation timer duration of all the candidate BS and determines a target BS according to the resource reservation timer duration of the candidate BS, a resource utilization rate and signal quality. The invention also discloses a system of selecting a target BS. By using the method and the system of the invention, a success rate of the switching and performance of a media surface can be increased.
Description
Technical field
The present invention relates to worldwide interoperability for microwave access (WIMAX, Worldwide Interoperability for Microwave Access) network technology, refer to the method and system of select target base station in a kind of switching especially.
Background technology
According to WIMAX agreement, terminal (MS, Mobile Station) find serving BS (BS, Base Station) signal quality when dropping to threshold value, MOB-MSHO-REQ message trigger can be sent to serving BS broadcasts to switch, in message, carry a series of candidate BS and signal quality thereof.After serving BS broadcasts receives MOB-MSHO-REQ message, send R6-HO-REQ message to the candidate BS carried in message, notify that candidate BS carries out resource preparation; Serving BS broadcasts prepares to choose the BS meeting switching condition successful candidate BS from resource, recommends MS.Wherein, concrete handling process as shown in Figure 1, comprises the following steps:
Step 101: when reaching switching condition, MS sends MOB_MSHO_REQ message to serving BS broadcasts, carries the list of the candidate BS that can switch in message;
Step 102: after serving BS broadcasts receives message, sends R6_HO_Req message to candidate BS 1;
Step 103: after candidate BS 1 receives message, for MS prepares resource, and after being ready to complete, sends R6_HO_Rsp message to serving BS broadcasts;
Step 104: after serving BS broadcasts receives message, sends R6_HO_Ack message to candidate BS 1, shows the confirmation responded candidate BS 1;
Step 105: after serving BS broadcasts receives MOB_MSHO_REQ message, sends R6_HO_Request message to candidate BS 2;
Step 106: candidate BS 2 is MS preparation resource, and after being ready to complete, sends R6_HO_Rsp message to serving BS broadcasts;
Step 107: after serving BS broadcasts receives message, sends R6_HO_Ack message to candidate BS 2, shows the confirmation responded candidate BS;
Step 108: serving BS broadcasts chooses suitable target BS after receiving the R6_HO_Ack message of all candidate BS, recommends MS by MOB_BSHO_RSP message;
Step 109:MS determines to switch, and sends MOB_HO_IND message to serving BS broadcasts, the target BS after prompting switches;
Step 110a: serving BS broadcasts sends R6_HO_Cnf message to the target BS chosen, and type is confirm;
Step 110b: target BS responds R6_HO_Ack message to serving BS broadcasts, shows the confirmation to R6_HO_Cnf message;
Step 110c:MS sends RNG_REQ message to target BS, request access;
Step 110d: target BS sends RNG_RSP message to MS;
Step 110e: target BS sends R6_HO_Complete message to serving BS broadcasts, after serving BS broadcasts receives message, the resource of release MS.
Meanwhile, according to agreement regulation, MS can denial of service BS recommend target BS, require that serving BS broadcasts recommends target BS again, now, serving BS broadcasts should be chosen other candidate BS meeting recommendation condition and recommend MS, concrete handling process as shown in Figure 2, comprises the following steps:
Step 201: serving BS broadcasts chooses suitable target BS, recommends MS by MOB_BSHO_RSP message, here, suppose that candidate BS 1 is target BS;
Step 202:MS refuses to switch, and sends MOB_HO_IND message to serving BS broadcasts;
Step 203: after serving BS broadcasts receives message, chooses suitable target BS again, recommends MS by MOB_BSHO_RSP message, here, suppose that candidate BS 2 is target BS;
Step 204:MS determines to switch, and sends MOB_HO_IND message to serving BS broadcasts, carries the target BS after switching in message;
Step 205: serving BS broadcasts sends R6_HO_Cnf message to the target BS chosen, and type is confirm;
Step 206: target BS responds R6_HO_Ack message to serving BS broadcasts, shows the confirmation to R6_HO_Cnf message;
Step 207:MS sends RNG_REQ message to target BS, request access;
Step 208: target BS sends RNG_RSP message to MS;
Step 209: target BS sends R6_HO_Complete message to serving BS broadcasts, after serving BS broadcasts receives message, the resource of release MS.
As can be seen from description above, switch in the process prepared, may have multiple candidate BS, each candidate BS needs for MS prepares resource.But, candidate BS can not indefinite be MS reservation of resource, therefore, each candidate BS, after finishing resource, can start resource reservation timer.But, due to eat dishes without rice or wine and network side exist postpone, and, MS refusal switch after, service MS also need again to recommend the factors such as target BS, likely can cause the target BS of final checked deleted into MS prepare resource.Now, MS can switch to the BS of an offhand resource, so, can reduce handover success rate, and switching can cause data elongated for break period, so, causes packet loss quantity to increase, thus affects medium surface performance.
Summary of the invention
In view of this, main purpose of the present invention is the method and system providing select target base station in a kind of switching, can improve the success rate and medium surface performance that switch.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides the method for select target base station in a kind of switching, the method comprises:
Candidate BS receives the resource request message of serving BS broadcasts, and after finishing resource for MS, sends the response message comprising resource reservation timer duration to serving BS broadcasts;
Serving BS broadcasts preserves the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS.
In such scheme, according to the resource reservation timer duration of candidate BS, resource utilization and signal quality, before determining target BS, the method comprises further:
Serving BS broadcasts obtains and preserves the resource utilization of self all adjacent area BS.
In such scheme, described serving BS broadcasts obtains and preserves the resource utilization of adjacent area BS, for:
After startup, serving BS broadcasts sends RRM (RRM, Radio Resource Management) message to self all adjacent area BS, the resource utilization of request adjacent area BS;
After adjacent area BS receives message, regularly report the resource utilization of self to serving BS broadcasts;
After serving BS broadcasts receives the resource utilization that adjacent area BS reports, preserve the resource utilization of adjacent area BS.
In such scheme, the described resource reservation timer duration according to candidate BS, resource utilization and signal quality, determine target BS, for:
Judge current time to be deducted the duration that the timestamp receiving response message adds network side gained time of delay, whether be less than the resource reservation device duration of candidate BS, after determining to be less than, whether the resource utilization of the further candidate of judgement BS exceedes congestion threshold, after determining not exceed, after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts, whether income value is greater than hysteretic threshold, and determine to be greater than, this candidate BS is suitable as target BS;
Select to be suitable as candidate BS that in all candidate BS of target BS, signal quality is best as target BS.
In such scheme, the method comprises further:
Receiving after duration that the timestamp of response message adds network side gained time of delay is greater than the resource reservation device duration of candidate BS when determining that current time deducts, thinking that described candidate BS is not suitable as target BS; Or,
After determining that the resource utilization of candidate BS exceedes congestion threshold, think that described candidate BS is not suitable as target BS; Or,
After determining that income value is less than hysteretic threshold after the signal quality of candidate BS deducts the signal quality of serving BS broadcasts, think that described candidate BS is not suitable as target BS.
In such scheme, the method comprises further:
The target BS determined is sent to MS by serving BS broadcasts;
After MS receives target BS, determine to switch or refusal switching.
Present invention also offers the system of select target BS in a kind of switching, this system comprises: serving BS broadcasts and candidate BS; Wherein,
Serving BS broadcasts, for receive candidate BS send comprise the response message of resource reservation timer duration after, preserve the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS;
Candidate BS, for receiving the resource request message of serving BS broadcasts, and after finishing resource for MS, sends the response message comprising resource reservation timer duration to serving BS broadcasts.
In such scheme, this system comprises adjacent area BS further, and after receiving RRM message that serving BS broadcasts sends, timing to report self resource utilization to serving BS broadcasts;
Described serving BS broadcasts, after starting, sends RRM message to self all adjacent area BS, the resource utilization of request adjacent area BS, and after receiving the resource utilization that adjacent area BS reports, preserves the resource utilization of adjacent area BS.
In such scheme, this system comprises MS further, for after the target BS receiving serving BS broadcasts transmission, determines to switch or refusal switching;
Described serving BS broadcasts, also for the target BS determined is sent to MS.
In such scheme, described candidate BS is more than one candidate BS.
The method and system of select target base station in switching provided by the invention, candidate BS is after MS finishes resource, sends the response message comprising resource reservation timer duration to serving BS broadcasts; Serving BS broadcasts preserves the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS, so, the success rate and medium surface performance that switch can be improved.
In addition, when determining target BS, serving BS broadcasts first judges current time to deduct the resource reservation device duration whether duration that the timestamp receiving response message adds network side gained time of delay is less than candidate BS, after determining to be less than, whether the resource utilization of the further candidate of judgement BS exceedes congestion threshold, after determining not exceed, after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts, whether income value is greater than hysteretic threshold, determine to be greater than, this candidate BS is suitable as target BS; Select to be suitable as candidate BS that in all candidate BS of target BS, signal quality is best as target BS, so, the medium surface performance in switching can be improved further.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram realizing in prior art switching;
Fig. 2 is when the method flow schematic diagram that the realization after the target BS of MS denial of service BS recommendation switches in prior art;
Fig. 3 is the method flow schematic diagram of select target base station during the present invention switches;
Fig. 4 is the method flow schematic diagram that embodiment realizes switching;
Fig. 5 is the system configuration schematic diagram of select target base station during the present invention switches.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
During the present invention switches, the method for select target base station, as shown in Figure 3, comprises the following steps
Step 301: candidate BS receives the resource request message of serving BS broadcasts, and after finishing resource for MS, send the response message comprising resource reservation timer duration to serving BS broadcasts;
Particularly, candidate BS can send the R6_HO_Rsp message of carrying resource reservation timer duration to serving BS broadcasts;
In prior art, in advance on all BS, be configured with resource reservation timer.
Step 302: serving BS broadcasts preserves the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS;
Here, under normal circumstances, candidate BS should be a subset of adjacent area BS, that is: adjacent area BS comprises candidate BS or identical with candidate BS;
According to the resource reservation timer duration of candidate BS, resource utilization and signal quality, before determining target BS, serving BS broadcasts obtains and preserves the resource utilization of self all adjacent area BS;
Wherein, the resource utilization of described acquisition adjacent area BS, is specially:
After startup, serving BS broadcasts sends RRM message to self all adjacent area BS, the resource utilization of request adjacent area BS;
After adjacent area BS receives message, regularly report the resource utilization of self to serving BS broadcasts;
After serving BS broadcasts receives the resource utilization that adjacent area BS reports, preserve the resource utilization of adjacent area BS;
Wherein, serving BS broadcasts is configured with adjacent area BS, BS can obtain self all adjacent area BS according to the adjacent area BS of configuration; When configuring adjacent cell BS, webmaster using with the adjacent area BS of the equitant base station of the signal cover of serving BS broadcasts as serving BS broadcasts;
In the process of BS work, because As time goes on the resource utilization of each BS can change, therefore adjacent area BS needs timing to report the resource utilization of self to serving BS broadcasts, so that serving BS broadcasts can make selecting properly in follow-up judgement;
Carry the duration that timing reports in RRM message, the needs according to webmaster arrange the duration that timing reports, and general duration is set to 10min;
The described resource reservation timer duration according to candidate BS, resource utilization and signal quality, determine target BS, be specially:
Judge current time to deduct the resource reservation device duration whether duration that the timestamp receiving response message adds network side gained time of delay is less than candidate BS, after determining to be less than, whether the resource utilization of the further candidate of judgement BS exceedes congestion threshold, after determining not exceed, after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts, whether income value is greater than hysteretic threshold, determine to be greater than, this candidate BS is suitable as target BS;
Select to be suitable as candidate BS that in all candidate BS of target BS, signal quality is best as target BS;
Wherein, after serving BS broadcasts receives the response message comprising resource reservation timer duration, the timestamp of the response message of all adjacent area BS transmissions received can be preserved;
Side, networking just refers to time of delay in actual application, empirically can arrange R6 mouth time of delay, generally 2 ~ 3ms is set, or, can also by the duration once of the RRM interacting message in step 300 divided by 2, the value obtained is as network side time of delay;
In actual application, congestion threshold and hysteretic threshold can empirically be arranged, and generally arranging congestion threshold is 80%, and hysteretic threshold is 2dB;
When handover is needed, MS can send MOB_MSHO_REQ message to serving BS broadcasts, and carry the list of the candidate BS that can switch in message, list content comprises the signal quality of candidate BS and candidate BS, and serving BS broadcasts can obtain the signal quality of candidate BS accordingly;
Receiving after duration that the timestamp of response message adds network side gained time of delay is greater than the resource reservation device duration of candidate BS when determining that current time deducts, illustrating that this candidate BS is not suitable as target BS; After determining that the resource utilization of candidate BS exceedes congestion threshold, illustrate that this candidate BS does not have ability to access new business again, this candidate BS is not suitable as target BS; After determining that income value is less than hysteretic threshold after the signal quality of candidate BS deducts the signal quality of serving BS broadcasts, illustrate that the signal quality of this candidate BS does not meet switching condition, this candidate BS is not suitable as target BS.
When occurring that candidate BS is not the abnormal conditions of a subset of adjacent area BS, what such as do not configure during the BS of network management configuration adjacent area is comprehensive especially, more than one candidate BS in candidate BS does not belong to the scope of adjacent area BS, now, when doing to judge, candidate BS the resource reservation timer duration by candidate BS and the signal quality that do not belong to adjacent area BS scope judge whether this candidate BS is suitable as target BS, particularly, judge current time to deduct the resource reservation device duration whether duration that the timestamp receiving response message adds network side gained time of delay is less than candidate BS, after determining to be less than, whether the income value after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts is greater than hysteretic threshold, determine to be greater than, this candidate BS is suitable as target BS.
When the target BS determined is sent to MS by serving BS broadcasts, and after the switching of MS refusal, serving BS broadcasts adopts above-mentioned identical method to redefine target BS, now, when redefining target BS, if define plural candidate BS when being suitable as target BS, the target BS before determined is not re-used as the target BS redefined.
Below in conjunction with embodiment, the present invention is described in further detail again.
The application scenarios of the present embodiment is: serving BS broadcasts has two adjacent area BS, and the candidate BS that MS reports has two, and two adjacent area BS are identical with two BS, that is: BS 1 and BS 2.
Upon actuation, serving BS broadcasts sends the R6_RRM_SpareCapReq message of carrying the duration that timing reports respectively to BS 1 and BS 2, the resource service condition of request BS 1 and BS 2;
After BS 1 receives message, timing sends R6_RRM_SpareCapRpt message to serving BS broadcasts, reports the resource utilization of self;
After BS 2 receives message, timing sends R6_RRM_SpareCapRpt message to serving BS broadcasts, reports the resource utilization of self;
After serving BS broadcasts receives the resource utilization that BS 1 and BS 2 reports, preserve the resource utilization of BS 1 and BS 2.
When MS finds that the signal quality of serving BS broadcasts drops to threshold value, switch to serving BS broadcasts request, the present embodiment realizes the method switched, and as shown in Figure 4, comprises the following steps:
Step 401: when reaching switching condition, MS sends the MOB_MSHO_REQ message of carrying candidate BS and candidate BS signal quality to serving BS broadcasts;
Here, candidate BS just refers to BS 1 and BS 2.
Step 402: after serving BS broadcasts receives message, sends R6_HO_Req message to BS 1.
After step 403:BS 1 receives message, for MS prepares resource, and after being ready to complete, start resource reservation timer, send to serving BS broadcasts simultaneously and carry resource reservation timer R6_HO_Rsp message.
Step 404: after serving BS broadcasts receives message, sends R6_HO_Ack message to BS 1, shows the confirmation responded candidate BS 1.
Step 405: after serving BS broadcasts receives MOB_MSHO_REQ message, sends R6_HO_Request message to BS 2.
After step 406:BS 2 receives message, for MS prepares resource, and after being ready to complete, start resource reservation timer, send to serving BS broadcasts simultaneously and carry resource reservation timer R6_HO_Rsp message.
Step 407: after serving BS broadcasts receives message, sends R6_HO_Ack message to BS 2, shows the confirmation responded candidate BS 2.
Step 408: after serving BS broadcasts receives the R6_HO_Ack message of all candidate BS, preserve the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS, and the target BS determined is recommended MS by MOB_BSHO_RSP message;
Wherein, all candidate BS just refer to BS 1 and BS 2, the described resource reservation timer duration according to candidate BS, resource utilization and signal quality, determine target BS, are specially:
Judge current time to deduct the resource reservation device duration whether duration that the timestamp receiving response message adds network side gained time of delay is less than candidate BS, after determining to be less than, whether the resource utilization of the further candidate of judgement BS exceedes congestion threshold, after determining not exceed, after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts, whether income value is greater than hysteretic threshold, determine to be greater than, this candidate BS is suitable as target BS;
Select to be suitable as candidate BS that in all candidate BS of target BS, signal quality is best as target BS;
Here, suppose that BS 1 and BS 2 is all suitable as target BS, and the signal quality of BS 2 is higher than the signal quality of BS1, and now, serving BS broadcasts selects BS 2 as target BS.
After step 409:MS receives message, refusal switches, and sends MOB_HO_IND message to serving BS broadcasts.
Step 410: after serving BS broadcasts receives message, according to the resource reservation timer duration of candidate BS, resource utilization and signal quality, redefines target BS, and the target BS determined is recommended MS by MOB_BSHO_RSP message;
Wherein, the described resource reservation timer duration according to candidate BS, resource utilization and signal quality, determine target BS, be specially:
Judge current time to deduct the resource reservation device duration whether duration that the timestamp receiving response message adds network side gained time of delay is less than candidate BS, after determining to be less than, whether the resource utilization of the further candidate of judgement BS exceedes congestion threshold, after determining not exceed, after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts, whether income value is greater than hysteretic threshold, determine to be greater than, this candidate BS is suitable as target BS;
Select to be suitable as candidate BS that in all candidate BS of target BS, signal quality is best as target BS;
Now, serving BS broadcasts selects BS 1 as target BS.
After step 411:MS receives message, determine to switch, send MOB_HO_IND message to serving BS broadcasts, the target BS after prompting switches;
Here, the target BS after switching just refers to BS 1.
Step 412: after serving BS broadcasts receives message, send R6_HO_Cnf message to BS 1, type is confirm.
Step 413:BS 1 responds R6_HO_Ack message to serving BS broadcasts, shows the confirmation to R6_HO_Cnf message.
Step 414:MS sends RNG_REQ message to BS 1, request access.
After step 415:BS 1 receives message, send RNG_RSP message to MS.
Step 416:BS 1 sends R6_HO_Complete message to serving BS broadcasts, after serving BS broadcasts receives message, and the resource of release MS.
For realizing said method, present invention also offers the system of select target BS in a kind of switching, as shown in Figure 5, this system comprises: serving BS broadcasts 51 and candidate BS 52; Wherein,
Serving BS broadcasts 51, for receive candidate BS 52 send comprise the response message of resource reservation timer duration after, preserve the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS;
Candidate BS 52, for receiving the resource request message of serving BS broadcasts, and after finishing resource for MS, sends the response message comprising resource reservation timer duration to serving BS broadcasts 51.
It should be noted that: candidate BS 52 comprises more than one candidate BS.
Serving BS broadcasts 51, also for obtaining and preserving the resource utilization of adjacent area BS.
Wherein, this system can further include: adjacent area BS, and after receiving RRM message that serving BS broadcasts 51 sends, timing to report self resource utilization to serving BS broadcasts 51;
Described serving BS broadcasts 51, after starting, sends RRM message to self all adjacent area BS, the resource utilization of request adjacent area BS, and after receiving the resource utilization that adjacent area BS reports, preserves the resource utilization of adjacent area BS.
It should be noted that: adjacent area BS comprises more than one adjacent area BS, and target BS 52 is the subset of adjacent area BS.
Described serving BS broadcasts 51, also for the target BS determined is sent to MS;
This system can further include MS, for after the target BS receiving serving BS broadcasts 51 transmission, determines to switch or refusal switching.
Here, the concrete processing procedure of the serving BS broadcasts in described system of the present invention describes in detail hereinbefore, repeats no more.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a method for select target base station in switching, it is characterized in that, the method comprises:
Candidate base station (BS) receives the resource request message of serving BS broadcasts, and after finishing resource for terminal (MS), sends the response message comprising resource reservation timer duration to serving BS broadcasts;
Serving BS broadcasts preserves the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS;
Wherein, the described resource reservation timer duration according to candidate BS, resource utilization and signal quality, determine target BS, for:
Judge current time to be deducted the duration that the timestamp receiving response message adds network side gained time of delay, whether be less than the resource reservation device duration of candidate BS, after determining to be less than, whether the resource utilization of the further candidate of judgement BS exceedes congestion threshold, after determining not exceed, after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts, whether income value is greater than hysteretic threshold, and determine to be greater than, this candidate BS is suitable as target BS;
Select to be suitable as candidate BS that in all candidate BS of target BS, signal quality is best as target BS.
2. method according to claim 1, is characterized in that, according to the resource reservation timer duration of candidate BS, resource utilization and signal quality, before determining target BS, the method comprises further:
Serving BS broadcasts obtains and preserves the resource utilization of self all adjacent area BS.
3. according to the method shown in claim 2, it is characterized in that, described serving BS broadcasts obtains and preserves the resource utilization of adjacent area BS, for:
After startup, serving BS broadcasts sends RRM (RRM) message to self all adjacent area BS, the resource utilization of request adjacent area BS;
After adjacent area BS receives message, regularly report the resource utilization of self to serving BS broadcasts;
After serving BS broadcasts receives the resource utilization that adjacent area BS reports, preserve the resource utilization of adjacent area BS.
4. method according to claim 1, is characterized in that, the method comprises further:
Receiving after duration that the timestamp of response message adds network side gained time of delay is greater than the resource reservation device duration of candidate BS when determining that current time deducts, thinking that described candidate BS is not suitable as target BS; Or,
After determining that the resource utilization of candidate BS exceedes congestion threshold, think that described candidate BS is not suitable as target BS; Or,
After determining that income value is less than hysteretic threshold after the signal quality of candidate BS deducts the signal quality of serving BS broadcasts, think that described candidate BS is not suitable as target BS.
5. the method according to claim 1,2 or 3, it is characterized in that, the method comprises further:
The target BS determined is sent to MS by serving BS broadcasts;
After MS receives target BS, determine to switch or refusal switching.
6. a system of select target BS in switching, it is characterized in that, this system comprises: serving BS broadcasts and candidate BS; Wherein,
Serving BS broadcasts, for receive candidate BS send comprise the response message of resource reservation timer duration after, preserve the resource reservation timer duration of all candidate BS received, and the resource reservation timer duration of foundation candidate BS, resource utilization and signal quality, determine target BS;
Candidate BS, for receiving the resource request message of serving BS broadcasts, and after finishing resource for MS, sends the response message comprising resource reservation timer duration to serving BS broadcasts;
Described serving BS broadcasts, according to the resource reservation timer duration of candidate BS, resource utilization and signal quality, determines target BS, for:
Described serving BS broadcasts judges current time to be deducted the duration that the timestamp receiving response message adds network side gained time of delay, whether be less than the resource reservation device duration of candidate BS, after determining to be less than, whether the resource utilization of the further candidate of judgement BS exceedes congestion threshold, after determining not exceed, after the signal quality of the further candidate of judgement BS deducts the signal quality of serving BS broadcasts, whether income value is greater than hysteretic threshold, and determine to be greater than, this candidate BS is suitable as target BS;
Select to be suitable as candidate BS that in all candidate BS of target BS, signal quality is best as target BS.
7. system according to claim 6, is characterized in that, this system comprises adjacent area BS further, and after receiving RRM message that serving BS broadcasts sends, timing to report self resource utilization to serving BS broadcasts;
Described serving BS broadcasts, after starting, sends RRM message to self all adjacent area BS, the resource utilization of request adjacent area BS, and after receiving the resource utilization that adjacent area BS reports, preserves the resource utilization of adjacent area BS.
8. the system according to claim 6 or 7, is characterized in that, this system comprises MS further, for after the target BS receiving serving BS broadcasts transmission, determines to switch or refusal switching;
Described serving BS broadcasts, also for the target BS determined is sent to MS.
9. the system according to claim 6 or 7, is characterized in that, described candidate BS is more than one candidate BS.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010569599.2A CN102487537B (en) | 2010-12-02 | 2010-12-02 | Method for selecting target base station (BS) during switching and system thereof |
| PCT/CN2011/071934 WO2012071833A1 (en) | 2010-12-02 | 2011-03-17 | Method and system for selecting target base station during handover |
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| CN201010569599.2A CN102487537B (en) | 2010-12-02 | 2010-12-02 | Method for selecting target base station (BS) during switching and system thereof |
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| CN104144445B (en) * | 2013-05-10 | 2019-03-01 | 株式会社Ntt都科摩 | Cell selecting method, base station and wireless communication system |
| CN105580429B (en) * | 2013-11-21 | 2020-06-26 | 华为技术有限公司 | Method and device for selecting target network side equipment |
| CN110115059B (en) * | 2017-01-19 | 2021-01-05 | 华为技术有限公司 | Method and terminal for transmitting data packet |
| CN109246798A (en) * | 2018-10-16 | 2019-01-18 | 杭州迪普科技股份有限公司 | The processing method and processing device of terminal access in a kind of WLAN |
| CN111615155B (en) * | 2019-04-09 | 2022-03-15 | 维沃移动通信有限公司 | Terminal switching method and communication equipment |
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| CN1794865A (en) * | 2005-06-06 | 2006-06-28 | 华为技术有限公司 | Method of switching terminal between base station |
| CN101026483A (en) * | 2006-02-20 | 2007-08-29 | 华为技术有限公司 | Base. station idle resource obtaining method for WiMAX system |
| CN101635968A (en) * | 2008-07-22 | 2010-01-27 | 株式会社Ntt都科摩 | Switch processing method, base station and network communication system |
| CN101888674A (en) * | 2009-05-13 | 2010-11-17 | 中兴通讯股份有限公司 | Switching processing method and device |
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| CN1983993B (en) * | 2006-03-29 | 2010-05-12 | 华为技术有限公司 | Method for monitoring system resource |
| KR20080041576A (en) * | 2006-11-07 | 2008-05-13 | 삼성전자주식회사 | Method for handover in a wireless communication system |
| CN101521920A (en) * | 2008-02-29 | 2009-09-02 | 中兴通讯股份有限公司 | Base station switching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1794865A (en) * | 2005-06-06 | 2006-06-28 | 华为技术有限公司 | Method of switching terminal between base station |
| CN101026483A (en) * | 2006-02-20 | 2007-08-29 | 华为技术有限公司 | Base. station idle resource obtaining method for WiMAX system |
| CN101635968A (en) * | 2008-07-22 | 2010-01-27 | 株式会社Ntt都科摩 | Switch processing method, base station and network communication system |
| CN101888674A (en) * | 2009-05-13 | 2010-11-17 | 中兴通讯股份有限公司 | Switching processing method and device |
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| WO2012071833A1 (en) | 2012-06-07 |
| CN102487537A (en) | 2012-06-06 |
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