CN101184325A - Switch method and terminal in communication system - Google Patents
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- CN101184325A CN101184325A CNA2006101470616A CN200610147061A CN101184325A CN 101184325 A CN101184325 A CN 101184325A CN A2006101470616 A CNA2006101470616 A CN A2006101470616A CN 200610147061 A CN200610147061 A CN 200610147061A CN 101184325 A CN101184325 A CN 101184325A
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Abstract
The invention discloses a switching method and a terminal in the communications system, wherein the switching method comprises the steps: step A: the UE measures the pilot signal strength of an adjacent subdistrict and the distance between the adjacent subdistricts; step B: the UE estimates whether the measuring result can update an active set; if yes, the judgment result is reported to a switching control device, and then step C can be implemented; otherwise, return back to step A; step C: the switching and control device informs the UE to update the active set and to implement relevant switching operation according to the received judgment result. In accordance with the switching method and the terminal of the communications system of the invention, the misjudgment probability can be reduced; and the unnecessary frequent switching caused by the misjudgment can be avoided and the system resource is saved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to changing method and terminal in a kind of communication system.
Background technology
Because mobile communication system adopts honeycomb, portable terminal (UE) need carry out handover when crossing over the spatial division sub-district, promptly finish the transfer of the air interface of terminal to base station.All adopt in the first generation and second generation mobile communication system and distinguish hard-switching technology more, direct-cut operation causes communication disruption easily.The handoff technique of the third generation (3G) mobile communication system is under the situation of the existing handoff technique of compatibility, introduced new handoff technique according to the ability of self, as Wideband Code Division Multiple Access (WCDMA) (Wide bandCDMA, WCDMA) system adopts the soft hand-off of grand diversity between homogeneous frequency adjacent area, adopts the More Soft Handoff technology between a plurality of sectors of same sub-district same carrier wave.
At present, the soft handover method of WCDMA mobile communication system, usually the signal strength signal intensity (Ec/No) of the pilot channel (CPICH) of the tested sub-district of employing is as the input measurement parameter of judging whether terminal is switched, but the weak point of this method is: decision parameter is single, causes erroneous judgement disconnected easily.For example, because the stopping of building, the signal of the sub-district 1 that UE receives is less than sub-district 2 signals that receive, although the distance of UE and sub-district 1 less than the distance of sub-district 2, UE also can switch to current sub-district 2 with more strong cohesiveness collection of letters number.But when UE walked around this building, the signal that UE receives sub-district 1 was higher than the signal of sub-district 2 suddenly, and at this moment, UE will switch to sub-district 1 again, thereby " ping-pong " occur, cause frequent soft handover.In WCDMA system testing process, increase because the frequent switching of UE and system causes signaling quantity, thereby the overhead of increase air interface bandwidth has been wasted the precious resources of system.
Summary of the invention
The objective of the invention is to, the changing method in a kind of communication system is provided.
Another object of the present invention is to, a kind of terminal is provided.
Changing method in the communication system of the present invention comprises the following steps:
Steps A: the pilot signal strength of UE measure neighbor cells with and and adjacent cell between distance;
Step B:UE judges whether to upgrade Active Set according to described measurement result, if, then judged result is reported to switching control, and execution in step C; Otherwise, return steps A;
Step C: switching control upgrades Active Set according to the judged result notice UE that receives, and carries out correspondingly handover operation.
Wherein, in the described steps A, the distance between UE and the adjacent cell can arrive the time difference according to the observation of the Common Pilot Channel frame of minizone to calculate, perhaps calculate according to two-way time and reception-launch time difference, perhaps the mode by the GPS parameter calculates.
Wherein, among the described step B, describedly judge whether to upgrade Active Set and comprise the following steps:
Step B1: whether the pilot signal strength of sub-district relatively is worth greater than signal strength signal intensity in the inactive set that records among the determining step A, and whether the distance of judging this measured sub-district and UE less than distance value of setting of presetting, if, execution in step B2 then; Otherwise, return step B1;
Step B2: whether the Active Set of judging UE is full, and if not, then judged result is for joining the sub-district in the described inactive set in the Active Set; Otherwise, return step B1, perhaps, the most weak sub-district of signal in the Active Set is shifted out, and the sub-district in the described inactive set is joined in the Active Set.
Wherein, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, adds that then increasing the lagged value that the sub-district sets in described Active Set obtains.
Wherein, among the described step B2,, before returning step B1, may further include the following step if judge when the UE Active Set has been expired:
Judge UE monitoring concentrates the strongest district pilots signal strength signal intensity whether relatively to be worth greater than signal strength signal intensity,, and will monitor concentrated described sub-district and join in the Active Set if then judged result is for shifting out the most weak sub-district of signal in the Active Set; Otherwise, return step B1.
Wherein, described signal strength signal intensity relatively is worth, and adds that with district pilots signal strength signal intensity the strongest in the UE Active Set lagged value that shifts out the most small and weak district of signal and add new signal best cell from Active Set in Active Set obtains.
Describedly judge whether to upgrade Active Set and can comprise the following steps:
Step B1 ': whether the pilot signal strength of sub-district relatively is worth less than signal strength signal intensity in the Active Set that records among the determining step A, and whether the distance of judging described this sub-district that records and UE is greater than the distance value of setting, if, then judged result is for shifting out described sub-district from Active Set, otherwise, return step B1 '.
Wherein, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, deducts then to remove the lagged value that the sub-district sets obtain from Active Set.
Wherein, described distance value of setting can perhaps dynamically be adjusted during network operation according to the footprint size of sub-district in the network planning or given when optimizing.
Wherein, described switching control can be RNC or base station.
The invention has the beneficial effects as follows: according to changing method in the communication system of the present invention and terminal, keep will measure the decision parameter that the district pilots signal strength signal intensity switches as terminal in, whether adjudicate terminal jointly by the relative distance parameter of introducing measuring terminals and sub-district switches, can reduce to judge by accident the off line rate, avoid causing unnecessary frequent switching, thereby saved system resource because of judging by accident to break.
Description of drawings
Fig. 1 is the flow chart of the changing method in the communication system of the present invention;
Fig. 2 is the schematic diagram of changing method of the present invention.
Embodiment
Below, 1～2 changing method and the terminal that describes in detail in the communication system of the present invention in conjunction with the accompanying drawings.
As shown in Figure 1, the changing method in the communication system of the present invention comprises the following steps:
The pilot signal strength of step 1:UE measure neighbor cells with and and adjacent cell between distance;
Step 2:UE judges whether to upgrade Active Set according to described measurement result, if, then send and report to switching control, and execution in step 3; Otherwise, return step 1;
Step 3: switching control upgrades Active Set according to the judged result notice UE that receives, and carries out correspondingly handover operation.
Wherein, described switching control can be RNC or base station.
Wherein, in step 1, the observation that distance between UE and the neighbor cell can be passed through the Common Pilot Channel frame of minizone arrives time difference (SFN-SFN Observed Time Difference Of Arrival, SFN-SFN OTDOA) realizes, also can pass through to obtain with reception-launch time poor (Rx-Tx time difference) two-way time (RTT), (Global PositionSysterm, GPS) mode of parameter obtains can also to pass through global positioning system.
OTDOA is a kind of locate mode that is applied under the 3G network.The basic principle of this localization method is: UE measures the down-bound pilot frequency signal of different districts, obtain the different districts down-bound pilot frequency signal due in (Time of Arrival, TOA), promptly so-called pilot phase is measured; Obtain the skyborne transmission time of this pilot signal thus, this time be multiply by radio wave propagation speed (3 * 10
5Km/s), can obtain distance between UE and the sub-district.Make in this way, need the measured sub-district of UE to send down-bound pilot frequency signal simultaneously.Therefore, time synchronized must be realized in all sub-districts in the network, can realize the synchronous of sub-district by the GPS receiver being installed in the sub-district or being connected to time synchronization network usually.
Wherein, in described step 2, described renewal Active Set comprises following three kinds of situations:
1) in the UE Active Set, increases the sub-district, incident 1A promptly takes place.
2) the most weak sub-district of signal in the UE Active Set is shifted out, incident 1B promptly takes place.
3) the most weak sub-district of signal in the UE Active Set is shifted out, and will monitor and concentrate the strongest sub-district of signal to join in the described Active Set, incident 1C promptly takes place.
Situation for the incident of generation 1A:
In described step 2, describedly judge whether to upgrade Active Set and comprise the following steps:
Step 21: whether the district pilots signal strength signal intensity (Pilot_Ec/No) of the inactive set that records in the determining step 1 relatively is worth greater than a signal strength signal intensity, and the lasting Δ T time interval, and whether the distance of judging described this sub-district that records and UE is less than first distance value of setting, be expression formula Pilot_Distance＜Ds_Th1, if then execution in step 22; Otherwise, return step 21;
Wherein, described signal strength signal intensity relatively is worth, deduct the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, add that then increasing the lagged value that the sub-district sets in described Active Set obtains, expression formula is: Best_Pilot_Ec/No-As_Th+As_Th_Hyst.Wherein: As_Th is the soft handover thresholding; As_Th_Hyst is that the link when increasing the sub-district in Active Set increases lagged value.
Pilot_Distance enters the sub-district of UE measuring range and the distance between the UE; Ds_Th1 is first distance value of setting.In addition, the first distance value of the setting Ds_Th1 is given when the network planning and the optimization according to the footprint size of sub-district, and can dynamically adjusts during network operation.
Step 22: whether the Active Set of judging UE is full, and if not, then judged result for the sub-district of described inactive set can be joined in the described Active Set incident 1A takes place promptly; Otherwise, return step 21, perhaps, the most weak sub-district of signal in the Active Set is shifted out, and the sub-district of described inactive set is joined in the Active Set.
At this moment, in step 3, RNC joins the sub-district of this inactive set in the Active Set according to the described judged result notice UE that receives, and carries out correspondingly handover operation.
Situation for the incident of generation 1C:
Based on as previously mentioned, in described step 2, in described step 22,, before returning step 21, may further include the following step if judge when the UE Active Set has been expired:
Judge whether the strongest district pilots signal strength signal intensity (Best_candidate_Pilot_Ec/No) relatively is worth greater than a signal strength signal intensity in the UE monitoring collection (The Monitored Set), if, then judged result is for shifting out the most weak sub-district of signal in the Active Set, and will monitor the described sub-district of concentrating and join in the Active Set; Otherwise, return step 21.
Wherein, described signal strength signal intensity relatively is worth, add that with district pilots signal strength signal intensity the strongest in the UE Active Set lagged value that shifts out the most small and weak district of signal and add new signal best cell from Active Set in Active Set obtains, expression formula is: Best_candidate_Pilot_Ec/No＞(Worst_old_Pilot_Ec/No+As_Rep_Hyst).
Wherein: Worst_old_Pilot_Ec/No is the sub-district CPICH signal strength signal intensity that has weak signal in the UE Active Set; As_Rep_Hyst adds the lagged value of new best cell simultaneously for to shift out the most small and weak district from the UE Active Set.
At this moment, in step 3, RNC shifts out sub-district the most weak in the Active Set according to the described judged result notice UE that receives, and concentrates the strongest sub-district of signal to join in the Active Set described monitoring, and carries out correspondingly handover operation.
Situation for the incident of generation 1B:
Based on as previously mentioned, in described step 2, describedly judge whether to upgrade Active Set and comprise the following steps:
Step 21 ': whether the pilot signal strength of sub-district (Pilot_Ec/No) relatively is worth less than a signal strength signal intensity in the Active Set that records in the determining step 1, and the lasting Δ T time interval, and whether the distance of judging described this sub-district that records and UE is greater than the second distance value of setting, be that expression formula is Pilot_Distance＞Ds_Th2, if, then judged result is for shifting out described sub-district from Active Set, otherwise, return step 21 '.
Wherein, described signal strength signal intensity relatively is worth, deduct the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, deduct then and remove the lagged value that the sub-district sets obtain from Active Set, expression formula is: Pilot_Ec/No＜(Best_Pilot_Ec/No-As_Th-As_Th_Hyst).Wherein: As_Th is the soft handover thresholding; As_Th_Hyst is that the link when removing the sub-district from Active Set is removed lagged value; Pilot_Distance enters the sub-district of UE measuring range and the distance between the UE; Ds_Th2 is the second distance value of setting.Wherein, the second distance value of setting Ds_Th2, be according to the footprint size of sub-district in the network planning with given when optimizing, and can during network operation, dynamically adjust.
At this moment, in step 3, RNC shifts out this sub-district according to the described judged result notice UE that receives from Active Set, and carries out correspondingly handover operation.
The Δ T time interval described in above-described incident 1A, 1B, the 1C can be zero.
Below, describe terminal of the present invention in detail, comprise measuring unit and judging unit, wherein, described measuring unit is used for the pilot signal strength of measure neighbor cells and the distance between terminal and the adjacent cell, and described measurement result is sent to judging unit; Described judging unit is used to receive the described measurement result that described measuring unit sends, and judges whether to upgrade Active Set according to described measurement result, when judgement can be upgraded Active Set, judged result is reported to switching control.Wherein, described switching control can be RNC or base station.
Wherein, described measuring unit arrives the time difference according to the observation of the Common Pilot Channel frame of minizone, and is perhaps poor according to two-way time and reception-launch time, and perhaps the mode by the GPS parameter calculates the distance between UE and the adjacent cell.
In addition, based on as mentioned above, described measuring unit is further used for measuring the pilot signal strength of sub-district in the inactive set, and described measurement result is sent to described judging unit; Described judging unit, the pilot signal strength that is further used for sub-district in the described inactive set that receives relatively is worth greater than signal strength signal intensity and the distance of measured this sub-district and UE during less than default distance value of setting, if determine that Active Set is non-full, then described judged result is: the sub-district in the described inactive set can be joined in the Active Set; If determine that Active Set is full, then described judging unit repeats described judgement, determines that perhaps described judged result is: the most weak sub-district of signal in the Active Set is shifted out, and the sub-district in the described inactive set is joined in the Active Set.
Wherein, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, adds that then increasing the lagged value that the sub-district sets in described Active Set obtains.
In addition, based on as mentioned above, when definite Active Set was expired, described measuring unit was further used for measuring the UE monitoring and concentrates the strongest district pilots signal strength signal intensity, and described measurement result is sent to described judging unit; Described judging unit, be further used for when the described UE monitoring that receives concentrates the strongest district pilots signal strength signal intensity relatively to be worth greater than signal strength signal intensity, described judged result is: the most weak sub-district of signal in the Active Set is shifted out, and will monitor the described sub-district of concentrating and join in the Active Set.
Wherein, described signal strength signal intensity relatively is worth, and adds that with district pilots signal strength signal intensity the strongest in the UE Active Set lagged value that shifts out the most small and weak district of signal and add new signal best cell from Active Set in Active Set obtains.
In addition, the described judging unit of terminal of the present invention, the pilot signal strength that is further used for sub-district in the described Active Set that receives relatively is worth less than signal strength signal intensity and the distance of measured this sub-district and UE during greater than default distance value of setting, and described judged result is: described sub-district is shifted out from Active Set.
Wherein, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, deducts then to remove the lagged value that the sub-district sets obtain from Active Set.
In addition, aforesaid distance value of setting can perhaps dynamically be adjusted during network operation according to the footprint size of sub-district in the network planning or given when optimizing.
Concrete, as shown in Figure 2, at t0 constantly, UE connects with sub-district 1.
Incident 1A:
At moment t1, sub-district 1 is the sub-district that has peak signal in the UE Active Set.At this moment, the UE at first signal strength signal intensity Pilot_Ec/No of the pilot channel of calculation plot 1 deducts soft handover thresholding As_Th, add then in Active Set increase the sub-district given lagged value As_Th_Hyst, then, UE makes the following judgment: 1) whether the CPICH signal strength signal intensity of the sub-district 2 of inactive set greater than the result of aforementioned calculation, and the lasting Δ T time interval; 2) Active Set of UE whether less than; 3) whether the distance of sub-district 2 and UE is less than the first distance value of setting Ds_Th1.
If above-mentioned 3 conditions satisfy simultaneously, then UE asks sub-district 2 is joined in the Active Set of UE to the report that the base station and the RNC of sub-district 2 sends " incident 1A takes place ".
Incident 1C:
At moment t2, sub-district 3 is that the sub-district with peak signal is concentrated in the UE monitoring.At this moment, the UE at first CPICH signal strength signal intensity of calculation plot 3 carries out following judgement: 1) whether the signal strength signal intensity of sub-district 3 greater than the signal strength signal intensity and the As_Rep_Hyst sum of sub-district in the Active Set 1, and the lasting Δ T time interval; 2) Active Set of UE is full.
If above-mentioned 2 conditions satisfy simultaneously, then UE asks sub-district 1 is removed from the Active Set of UE, and sub-district 3 is joined in the Active Set of UE to the report that the base station and the RNC of sub-district 3 sends " incident 1C takes place ".
Incident 1B:
At moment t3, sub-district 2 is the sub-districts that have peak signal in the UE Active Set.At this moment, the UE at first CPICH signal strength signal intensity of calculation plot 2 deducts soft handover thresholding As_Th, deduct then from Active Set, remove the sub-district given lagged value As_Th_Hyst, then, UE makes the following judgment: 1) in the Active Set CPICH signal strength signal intensity of sub-district 3 less than the result of aforementioned calculation, and lasting Δ T time interval; 2) distance of sub-district 3 and UE is greater than the distance value of setting scope Ds_Th2.
If above-mentioned 2 conditions satisfy simultaneously, then UE asks sub-district 3 is removed from the Active Set of UE to the report that the base station and the RNC of sub-district 3 sends " incident 1B takes place ".
More than, be example only with the WCDMA system, the method for switching in communication system of the present invention is described, but the present invention is not limited thereto, can also be applied in other various cellular radio Communication systems (for example wireless communication system of 3.5G, 4G).
In sum, according to method of in communication system, switching of the present invention and terminal, to measure the decision parameter while that the district pilots signal strength signal intensity is switched as terminal in reservation, whether adjudicate terminal jointly by the relative distance parameter of introducing measuring terminals and sub-district switches, can reduce to judge the off line rate by accident, avoid causing unnecessary frequent switching, and then reduce the signaling number that soft handover causes because of judging by accident to break, improve the utilance of air interface bandwidth, thereby saved system resource.
Concerning those skilled in the art, can associate other advantage and distortion according to above embodiment.Therefore, the present invention is not limited to above-mentioned specific embodiment, and it carries out detailed, exemplary explanation as just example to the present invention.In the scope that does not deviate from aim of the present invention, those of ordinary skills can replace resulting technical scheme by various being equal to according to above-mentioned specific embodiment, but these technical schemes all should be included in the scope of claim of the present invention and the scope that is equal within.
Claims (19)
1. the changing method in the communication system is characterized in that, comprises the following steps:
Steps A: the pilot signal strength of UE measure neighbor cells with and and adjacent cell between distance;
Step B:UE judges whether to upgrade Active Set according to described measurement result, if, then judged result is reported to switching control, and execution in step C; Otherwise, return steps A;
Step C: switching control upgrades Active Set according to the judged result notice UE that receives, and carries out correspondingly handover operation.
2. the changing method in the communication system as claimed in claim 1, it is characterized in that, in the described steps A, distance between UE and the adjacent cell, arriving the time difference according to the observation of the Common Pilot Channel frame of minizone calculates, perhaps calculate according to two-way time and reception-launch time difference, perhaps the mode by the GPS parameter calculates.
3. the changing method in the communication system as claimed in claim 1 is characterized in that, among the described step B, describedly judges whether to upgrade Active Set and comprises the following steps:
Step B1: whether the pilot signal strength of sub-district relatively is worth greater than signal strength signal intensity in the inactive set that records among the determining step A, and whether the distance of judging this measured sub-district and UE less than distance value of setting of presetting, if, execution in step B2 then; Otherwise, return step B1;
Step B2: whether the Active Set of judging UE is full, and if not, then judged result is for joining the sub-district in the described inactive set in the Active Set; Otherwise, return step B1, perhaps, the most weak sub-district of signal in the Active Set is shifted out, and the sub-district in the described inactive set is joined in the Active Set.
4. the changing method in the communication system as claimed in claim 3, it is characterized in that, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, adds that then increasing the lagged value that the sub-district sets in described Active Set obtains.
5. the changing method in the communication system as claimed in claim 3 is characterized in that, among the described step B2, if judge when the UE Active Set has been expired, further comprises the following steps: before returning step B1
Judge UE monitoring concentrates the strongest district pilots signal strength signal intensity whether relatively to be worth greater than signal strength signal intensity,, and will monitor concentrated described sub-district and join in the Active Set if then judged result is for shifting out the most weak sub-district of signal in the Active Set; Otherwise, return step B1.
6. the changing method in the communication system as claimed in claim 5, it is characterized in that, described signal strength signal intensity relatively is worth, and adds that with district pilots signal strength signal intensity the strongest in the UE Active Set lagged value that shifts out the most small and weak district of signal and add new signal best cell from Active Set in Active Set obtains.
7. the changing method in the communication system as claimed in claim 1 is characterized in that, describedly judges whether to upgrade Active Set and comprises the following steps:
Step B1 ': whether the pilot signal strength of sub-district relatively is worth less than signal strength signal intensity in the Active Set that records among the determining step A, and whether the distance of judging described this sub-district that records and UE is greater than default distance value of setting, if, then judged result is for shifting out described sub-district from Active Set, otherwise, return step B1 '.
8. the changing method in the communication system as claimed in claim 7, it is characterized in that, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, deducts then to remove the lagged value that the sub-district sets obtain from Active Set.
9. as the changing method in claim 3 or the 7 described communication systems, it is characterized in that described distance value of setting, is perhaps dynamically adjusted in the network planning or given when optimizing according to the footprint size of sub-district during network operation.
10. a terminal is characterized in that, comprises measuring unit and judging unit, wherein,
Described measuring unit is used for the pilot signal strength of measure neighbor cells and the distance between terminal and the adjacent cell, and described measurement result is sent to judging unit;
Described judging unit is used to receive the described measurement result that described measuring unit sends, and judges whether to upgrade Active Set according to described measurement result, when judgement can be upgraded Active Set, judged result is reported to switching control.
11. terminal as claimed in claim 10, it is characterized in that, described measuring unit arrives the time difference according to the observation of the Common Pilot Channel frame of minizone, and is perhaps poor according to two-way time and reception-launch time, and perhaps the mode by the GPS parameter calculates the distance between UE and the adjacent cell.
12. terminal as claimed in claim 10 is characterized in that,
Described measuring unit is further used for measuring the pilot signal strength of sub-district in the inactive set, and described measurement result is sent to described judging unit;
Described judging unit, the pilot signal strength that is further used for sub-district in the described inactive set that receives relatively is worth greater than signal strength signal intensity and the distance of measured this sub-district and UE during less than default distance value of setting, if determine that Active Set is non-full, then described judged result is: the sub-district in the described inactive set can be joined in the Active Set; If determine that Active Set is full, then described judging unit repeats described judgement, determines that perhaps described judged result is: the most weak sub-district of signal in the Active Set is shifted out, and the sub-district in the described inactive set is joined in the Active Set.
13. terminal as claimed in claim 12, it is characterized in that, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, adds that then increasing the lagged value that the sub-district sets in described Active Set obtains.
14. terminal as claimed in claim 12 is characterized in that, when definite Active Set is expired,
Described measuring unit is further used for measuring the UE monitoring and concentrates the strongest district pilots signal strength signal intensity, and described measurement result is sent to described judging unit;
Described judging unit, be further used for when the described UE monitoring that receives concentrates the strongest district pilots signal strength signal intensity relatively to be worth greater than signal strength signal intensity, described judged result is: the most weak sub-district of signal in the Active Set is shifted out, and will monitor the described sub-district of concentrating and join in the Active Set.
15. terminal as claimed in claim 14, it is characterized in that, described signal strength signal intensity relatively is worth, and adds that with district pilots signal strength signal intensity the strongest in the UE Active Set lagged value that shifts out the most small and weak district of signal and add new signal best cell from Active Set in Active Set obtains.
16. terminal as claimed in claim 10 is characterized in that,
Described measuring unit is further used for measuring the pilot signal strength of sub-district in the Active Set, and described measurement result is sent to described judging unit;
Described judging unit, the pilot signal strength that is further used for sub-district in the described Active Set that receives relatively is worth less than signal strength signal intensity and the distance of measured this sub-district and UE during greater than default distance value of setting, and described judged result is: described sub-district is shifted out from Active Set.
17. terminal as claimed in claim 16 is characterized in that, described signal strength signal intensity relatively is worth, and deducts the soft handover thresholding of setting with district pilots signal strength signal intensity the strongest in the UE Active Set, deducts then to remove the lagged value that the sub-district sets obtain from Active Set.
18., it is characterized in that described distance value of setting, is perhaps dynamically adjusted in the network planning or given when optimizing according to the footprint size of sub-district as claim 12 or 16 described terminals during network operation.
19. terminal as claimed in claim 10 is characterized in that, described switching control is RNC or base station.
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| CN101547489B (en) * | 2009-04-30 | 2011-09-21 | 中兴通讯股份有限公司 | Hard handoff method and system for cell to establish forward supplemental channel |
| CN103781155A (en) * | 2012-10-17 | 2014-05-07 | 希姆通信息技术（上海）有限公司 | Mobile terminal and network searching method thereof |
| CN105657761A (en) * | 2016-03-03 | 2016-06-08 | 臧利 | Communication switching method and system for base stations |
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| CN110324835A (en) * | 2018-03-28 | 2019-10-11 | 北京松果电子有限公司 | Cell soft handoff event filter method, device, storage medium, base station and terminal |
| CN112333641A (en) * | 2020-10-28 | 2021-02-05 | 四川星网云联科技有限公司 | Cell dimension switching method based on ultra-wideband positioning |
| CN112449393A (en) * | 2020-12-23 | 2021-03-05 | 中国联合网络通信集团有限公司 | Cell switching method and terminal |
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| EP1078482A4 (en) * | 1998-04-30 | 2005-05-04 | Emulex Corp | Loop network hub using loop initialization insertion |
| US6351642B1 (en) * | 1998-12-22 | 2002-02-26 | Telefonaktiebolaget Lm Ericsson (Publ) | CDMA soft hand-off |
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| CN110324835A (en) * | 2018-03-28 | 2019-10-11 | 北京松果电子有限公司 | Cell soft handoff event filter method, device, storage medium, base station and terminal |
| CN112333641A (en) * | 2020-10-28 | 2021-02-05 | 四川星网云联科技有限公司 | Cell dimension switching method based on ultra-wideband positioning |
| CN112333641B (en) * | 2020-10-28 | 2024-02-20 | 北京停碳科技有限公司 | Cell dimension switching method based on ultra-wideband positioning |
| CN112449393A (en) * | 2020-12-23 | 2021-03-05 | 中国联合网络通信集团有限公司 | Cell switching method and terminal |
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