CN104093176A - A method to avoid ping-pong switching in LTE load balancing migration - Google Patents
A method to avoid ping-pong switching in LTE load balancing migration Download PDFInfo
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Abstract
A method for avoiding ping-pong switching in LTE load balancing migration comprises the steps that cells in an LTE network periodically detect the load level of a service cell s and judge whether the cell s is overloaded or not; if the cell s is overloaded, certain sets of UE is selected to issue measurement configuration, and the UE is configured to continuously report RSRP and RSRQ; if the cell s obtains the measured and reported load information of all adjacent cells, loads of all the adjacent cells are compared with an accepting threshold, and the adjacent cells with the loads lower than the accepting threshold are obtained to serve as candidate destination cells; the historical information of the UE reporting a measuring report is inquired, whether ping-pong switching occurs between the cell s and one of candidate cells or not is judged, whether it is suitable for initiating a switching request to a target cell or not is judged by comparing the adjacent cell signal intensity of the current switching and the adjacent cell signal intensity of the historical ping-pong switching, and thus ping-pong switching is avoided. The method for avoiding ping-pong switching in LTE load balancing migration can prevent a user from being migrated to an adjacent base station to cause ping-pong switching in the LTE load balancing process.
Description
Technical field
The invention belongs to moving communicating field, be specifically related to a kind of method of avoiding producing when load balancing is moved UE in LTE network pingpang handoff.
Background technology
In the protocol stack of 3GPP LTE access net system, mobility load balance (Mobility Load Balancing, MLB) by configuring to part UE sending measuring, obtain the measurement report that UE reports, make in advance the certain customers of overloaded cells be switched to low load adjacent cell, with solving the unbalanced traffic carrying capacity in multiple minizones, improve wireless resource utility efficiency.
Pingpang handoff refers to that a subscriber equipment (UE) back and forth repeatedly switches between intrasystem community, and the time that after each switching, UE stops in goal systems is all shorter, this pingpang handoff is all to bring adverse effect to network or to subscriber equipment.Subscriber equipment has carried out meaningless switching on the one hand, causes QoS of customer to reduce.Between base station, need on the other hand sending and receiving signaling message frequently, come flow burden, the resource of seriously having wasted wireless access system to Netowrk tape.
Base station generally adopts A3 event to judge whether to meet the switch decision condition based on covering, if UE records difference of signal that neighboring area signal is better than Serving cell, system is just switched to UE the better adjacent area of signal.The formula of A3 event entry condition: Mn+Ofn+Ocn-Hys > Ms+Ofs+Ocs+Off, each related symbol has a detailed description in the 5.5.4measurement report triggering of standard agreement " 3GPP TS 36.331 " chapters and sections, can be referring to corresponding document.
Base station generally adopts A4 or A5 event to judge whether to meet the switch decision condition based on load balancing.In the time adopting A4 event: when neighboring area signal is better than threshold value Thresh, system is just switched to UE this adjacent area, in order to equally loaded.The formula of A4 event entry condition: Mn+Ofn+Ocn-Hys > Thresh; In the time adopting A5 event: when service area signal, than threshold value Thresh1 is poorer, neighboring area signal is better than threshold value Thresh2, and system is just switched to UE this adjacent area, in order to equally loaded.The formula of A5 event entry condition: Ms+Hys < Thresh1 and Mn+Ofn+Ocn-Hys > Thresh2.
The generation that MLB causes pingpang handoff may have two kinds of reasons, a kind of do not consider the switch decision condition based on load balancing and based on cover switch decision condition can produce conflict, for example UE causes the switching based on load balancing owing to having triggered A4 or A5 event, be switched to community d from community s, now UE has triggered again A3 event immediately, is switched to community s from community d.Another kind is that user's peculair motion feature causes, for example, user Liang Ge moves back and forth between community, causes switching between the continuous Liang Ge of subscriber equipment community.
In existing LTE system standard specification, in switching set-up procedure, source base station is by handover request (HANDOVER REQUEST) message, the historical information of this UE (UE history information) is sent to target BS, thereby make each base station can obtain the information of accessing Guo community before this UE, judge by these information whether this UE pingpang handoff has occurred.
The historical information (UE history information) of UE is a chained list, chained list is made up of according to time sequencing descending UE " cell information (Last Visited Cell Information) of passing access ", be that the presence information occurring the nearest time is stored in first chained list node, the cell information of each passing access comprises following content:
Cell categories (classification comprises E-UTRAN/UTRAN/GERAN);
The overall identification (Cell Global Identifier, CGI) of community;
Cell type, its type can be " very little ", " little ", " medium " or " greatly ";
Resident time in UE community.
In sum, can find from above-mentioned prior art introduction, cannot avoid pingpang handoff according to existing UE historical information, because only having judged between UELiang Ge community, this method switches back and forth, and UE is in the time of each wireless system stop, do not consider concrete signal intensity or the quality of UE each adjacent base station community in the time of each switching, therefore can not take effective measures, the switch decision condition of going to adjust based on load balancing is avoided and produces conflict based on the switch decision condition covering.
Summary of the invention
The problem to be solved in the present invention is how to avoid in MLB process, causes pingpang handoff, thereby cause QoS of customer to reduce and seriously wasted the problem of the resource of wireless access system for UE is switched to neighbor cell by equalizing traffic.
Technical scheme of the present invention is a kind of method of avoiding producing pingpang handoff in the migration of LTE load balancing, comprises the following steps,
Step 1, the load level of each community is periodically detected in the base station in LTE network, and the current area of establishing base station S detection is community s, judges whether community s transships, and is to enter step 2, otherwise process ends;
Step 2, base station S chooses some UE and issues A4 or A5 measurement configuration in the s of community, and the UE of configuration continues reporting measurement reports, and measurement report comprises RSRP and RSRQ, and described RSRP is Reference Signal Received Power, described RSRQ is Reference Signal Received Quality;
Step 3, in the time that base station S receives the measurement report that arbitrary UE reports, the measurement report that base station S reports from UE, obtains RSRP and the RSRQ of each adjacent area reporting;
Step 4, base station S obtains the load information of all adjacent areas of community s by X2 interface, report the each adjacent area relating to carry out respectively respective load and receive thresholding comparison for UE in step 3, and using load lower than receiving the adjacent area of thresholding as alternative object community, judge whether alternative object number of cells n is 0, if process ends, enters step 5 if not;
Step 5, the UE historical information of base station S inquiry reporting measurement reports, the UE persistent district that more whether has certain record of UE historical information is one of them of alternative object community in step 4, and switch reasons is to cover the switching causing, and residence time is very short; If it is establish this article and be recorded as m article, establishing this alternative object community is community d, enters step 6, enters if not step 8;
Step 6, base station S continues to search UE historical information backward, and relatively whether the UE persistent district of m+1 article of UE historical information record is home cell, is if it is judged as pingpang handoff, enters step 7, enters if not step 8;
Step 7, whether RSRP and the RSRQ of base station S comparison step two gained community d are greater than respectively RSRP and the RSRQ of the m+1 article of recording cell d of institute of UE historical information, if enter step 8, if otherwise process ends;
Step 8, base station S fills in Last Visited UTRAN Cell Information in the UE history of X2HANDOVER REQUEST message IE, comprise interpolation cell destination cell RSRP and destination cell RSRQ RSRP and the RSRQ with recording step two gained community d, and send to the corresponding base station of community d.
And, in step 1, by judging whether cell load value is greater than threshold value and judges whether community transships.
And, in step 2, the UE that reports A2 measurement report is denoted as to edge UE, preferentially choose edge UE sending measuring configuration.
The present invention proposes UE switch determining method in a kind of simple LTE network, makes base station can obtain the extraneous information that UE switches, thereby avoids to a certain extent the pingpang handoff being caused by load balancing.The above technical scheme of conceiving by the present invention, compared with prior art, the present invention has following beneficial effect:
1, parameter is simple and obtain conveniently, and step 7 historical RSRP more used and RSRQ add in step 8, and this parameter is transmitted mutually by the X2 interface in LTE network, thereby the handoff parameter that community obtains its adjacent area more for convenience.
2, without adjusting handoff parameter according to switching statistics, arithmetic accuracy height adjustment speed is fast, focus on considering user awareness, can accurately control the switch decision algorithm of each UE to Target cell by adopting step 6, step 7, step 8, avoid occurring pingpang handoff in MLB process, thereby promote user awareness.
3, algorithm complex is low, without considering Serving cell and the different conflicts that cause of nearby region measurement configuration, destination cell RSRP can upgrade each switching due to step 8 time, destination cell RSRQ, by the contrast judgement of step 7, the pingpang handoff that finally can avoid Serving cell to cause with the nearby region measurement different conflicts that cause of configuration.
Brief description of the drawings
Fig. 1 is the basic flow sheet of the embodiment of the present invention.
Embodiment
The invention process provides a kind of Check processing mechanism of pingpang handoff, avoids the pingpang handoff that caused by load balancing, experiences and network performance thereby improve user.The present invention is described in further detail in conjunction with Fig. 1 below by embodiment.
Referring to Fig. 1, the flow process of embodiment is as follows:
Step 1, the load level of each community is periodically detected in the base station in LTE network, and general base station can travel through all respective cell and detect, if the current area that base station S detects is community s, judge whether community s transships, if this cell-overload, enter step 2, otherwise process ends.
When concrete enforcement, can be by judging whether cell load value is greater than threshold value and judges whether community transships, advise value in community all Physical Resource Block (the Physical Resource Block default to threshold value, be called for short PRB) total load when all occupied 75% to 85% between, the load detecting cycle can be set voluntarily by those skilled in the art, and general range is 1s to 10s.
Step 2, base station S selects some UE according to UE context in the s of community, sending measuring is configured to these UE, the UE that accepts configuration continues reporting measurement reports, measurement report comprises RSRP (Reference Signal Received Power, Reference Signal Received Power) and RSRQ (Reference Signal Received Quality, Reference Signal Received Quality).
The quantity of the each UE that selects sending measuring configuration of suggestion be any active ues (active UE) quantity 5% to 10%.When concrete enforcement, the UE that reports A2 measurement report can be denoted as to edge UE, preferentially choose edge UE sending measuring configuration, remaining can choosing at random.
Generally choose some UE and issue A4 or A5 measurement configuration, configuration UE continues to report RSRP (Reference Signal Received Power by measurement report, Reference Signal Received Power,) and RSRQ (Reference Signal Received Quality, Reference Signal Received Quality).Embodiment configuration UE adopts A4 to measure configuration, and configuration UE continues reporting measurement reports, and measurement report comprises RSRP and RSRQ.Select A5 to measure the subsequent treatment configuring similar, it will not go into details in the present invention.
Step 3, in the time that base station S receives the measurement report that arbitrary UE reports, the measurement report that base station S reports from UE, obtains RSRP and the RSRQ of each adjacent area that this UE reports.
In embodiment, UE reports A4 measurement report, obtains RSRP and the RSRQ of each adjacent area reporting.
Step 4, base station S obtains the load information of all adjacent areas of community s by X2 interface, report the each adjacent area relating to carry out respectively respective load and receive thresholding comparison for UE in step 3, and using load lower than receiving the adjacent area of thresholding as alternative object community, judge whether alternative object number of cells n is 0, and wherein n is positive integer, if n equals 0, represent that this overloaded cells s does not find the adjacent area that can carry out load balancing, process ends, if n 0 enters step 5.
When concrete enforcement, described in general community s, base station can obtain the load information of each adjacent area from base station under consular district by the X2 interface that specifies in LTE agreement, the total load of suggestion when receiving the default value of thresholding all PRB in community all occupied 50% to 60% between.
Step 5, the UE historical information (UE history Information IE) of base station S inquiry reporting measurement reports, relatively whether the UE persistent district of certain record (being made as m article) of UE historical information is that in step 4, one of them of alternative object community (is to be designated as community d), and switch reasons is to cover the switching causing, and residence time is very short, is less than and sets thresholding T.If enter step 6, enter if not step 8.UE history Information IE can extract from UE hand off signaling, is saved in the once base station information of resident mistake of UE of base station.
In the arbitrary dissatisfied step 8 that all enters of following three conditions, all meet and enter step 6:
In 1.UE historical information, there is one of them of alternative object community in the UE persistent district coupling step 4 of a record.
Switch reasons be cover due to.
3 residence times are less than setting thresholding.
When concrete enforcement, time gate limit value T can be preset by those skilled in the art, and general range is 2s to 10s.
In step 5, provide and judge that whether the most important condition of pingpang handoff once occurred in current Serving cell and alternative object minizone UE.Current Serving cell is community s, also can be described as home cell.
Step 6, base station S continues the UE historical information that finding step five is mentioned backward, relatively the UE persistent district of the m+1 article of record of UE history Information IE be whether home cell (be community s), if it is be judged as pingpang handoff, enter step 7, enter if not step 8.
In described step 6, provide and judge that whether second condition of pingpang handoff once occurred in Serving cell and alternative object minizone UE.
Step 7, (whether community d) this RSRP and RSRQ is all greater than this adjacent area (community RSRP and RSRQ d) in m+1 article of record of UE historical information described in step 6 in the more alternative object of base station S community, if it is allow to switch, enter step 8, if otherwise process ends.
Referring to step 8, the present invention sets while adding new record, records RSRP and the RSRQ of adjacent area, and while being therefore community d in the UE persistent district of m article of record, m+1 article is recorded (history) RSRP and the RSRQ of Zhong Yeyou community d.
Judge through step 5, six whether once pingpang handoff occurred community s for one of them with alternative object community, in described step 7, the RSRP and the RSRQ that in this step 2, record this adjacent area will be greater than respectively the RSRP and the RSRQ that while producing pingpang handoff, record, could allow to be again switched to corresponding adjacent area.
Neighboring area signal intensity while passing through so relatively this time with historical pingpang handoff, can judge whether to be applicable to initiate handover request to Target cell, thereby avoid producing pingpang handoff.
Step 8, in the Last Visited UTRAN Cell Information (referring to TS 36.413 agreement 9.2.1.43 chapters) of base station S in the UE history Information of X2 HANDOVER REQUEST message IE, add cell destination cell RSRP, destination cell RSRQ, the neighboring area signal intensity (Reference Signal Received Power of community d, Reference Signal Received Quality) recording in order to recording step two UE.Enter step 8 at every turn and form a new record in UE history Information IE.
HANDOVER REQUEST message is handover request message.The handover request message that X2 HANDOVER REQUEST message send by X2 interface, specifically can in the UE history Information of X2 HANDOVER REQUEST message IE, fill in Last Visited UTRAN Cell Information, fill in respectively Global Cell ID, Cell Type, the cells such as Time UE stayed in Cell, and destination cell RSRP, destination cell RSRQ and send to the object base station that alternative object community d hangs, then process ends by base station S.In standard agreement " 3GPP TS 36.413 " 9.2.1.42 chapters and sections, explained in detail each cell that UE history Information IE comprises, it will not go into details in the present invention.
Special, to certain UE of reporting measurement reports, may there is multiple alternative objects community all to meet step 5, six, seven condition, UE can preferentially select signal Hao community to switch in principle.For the purpose of raising the efficiency, if while having multiple alternative objects community (n is greater than 1), UE can first do an arrangement according to signal quality, before what signal was good put, base station starts to travel through one by one from signal Hao community, each traversal all starts to judge from the condition of step 5, find the community that meets step 5, six, seven conditionals just to switch, otherwise sequence checks next community according to signal.Those skilled in the art can according to circumstances Application Example provides voluntarily basic procedure, amendment adjustment on its basis, all should be in protection scope of the present invention.
When concrete enforcement, flow process of the present invention can realize automatic continuous operation based on software engineering.
For the sake of ease of implementation, below provide the example that utilizes embodiment of the present invention institute supplying method:
Community 1 and community 2 belong to respectively different base station, and adjacent area each other, have all opened MLB function.
Community 1 adopts A3 event as covering the judgment condition of switching, and when adjacent area RSRP is greater than Serving cell RSRP3dBm, UE will report A3 measurement report.
Community 2 adopts A3 event as covering the judgment condition of switching, and when adjacent area RSRP is greater than Serving cell RSRP2dBm, UE will report A3 measurement report.
UE1 accesses community 1, has reported A2 measurement report, in UE context, is denoted as edge customer.
Now detect that community 1 load exceedes threshold value, and the load of community 2 is lower than receiving thresholding.Choose some UE, comprised UE1, issued A4 and measured configuration, according to the measurement configuration issuing, if UE detects be more than or equal to-104dBm of the RSRP of adjacent area, will report A4 measurement report.
UE1 has reported the measurement report Serving cell RSRP:-101dBm of A4, Serving cell RSRQ:-8dB, adjacent area RSRP:-104dBm, RSRQ:-10dB, now the historical information of UE is empty, without doing accordingly switch decision, directly UE1 is switched to community 2, step 5 result is the no situation that then enters step 8.
Destination cell RSRP:-104dBm record LiaoUE1 community 1 in the UE of X2 handover request historical information in, destination cell RSRQ:-10dB, residence time is 50s,
Suppose that UE1 does not move, the signal of receiving remains unchanged, now UE1 reports A3 measurement report being switched to the rear horse back in community 2, in the A4 measurement report that the result Yu community 1 recording reports, signal quality is the same, be that adjacent area RSRP is-101dBm, adjacent area RSRQ:-8dB, the RSRP:-104dBm of Serving cell, the RSRQ:-10dB of Serving cell, is now switched to UE1 community 1.
Destination cell RSRP:-101dBm in UE1 community 2 is recorded in the Article 1 insertion of the UE of X2 handover request historical information, destination cell RSRQ:-8dB, residence time is 1s, switch reasons is to cover to cause.
When community 1 detects that load exceedes threshold value again, and the load of community 2 is lower than receiving thresholding.Choose some UE, comprised UE1, issued A4 and measured configuration.
Suppose that the not mobile signal of receiving of UE1 remains unchanged, now report A4 measurement report, in the A3 measurement report that the result Yu community 2 recording reports, signal quality is the same, be that Serving cell RSRP is-101dBm, Serving cell RSRQ:-8dB, the RSRP:-104dBm of adjacent area, the RSRQ:-10dB of adjacent area.Now travel through UE historical information, find first condition of Article 1 record matching pingpang handoff, find UE once in the resident mistake in alternative object community, switch reasons causes for covering, and residence time is very short, is less than and sets thresholding 2s.Find second condition of Article 2 record matching pingpang handoff,, on the Article 2 record of UE history message, find the once resident mistake in Serving cell of UE.RSRP and RSRQ on the Article 2 record of the RSRP that more now A4 reports and RSRQ and UE history message, discovery signals intensity and quality are not all improved, and therefore UE1 are not switched to community 2 again, thereby have avoided pingpang handoff frequently.
The present invention adopts and increase simple parameter in existing x2 interface signaling as can be seen here, contrasts historical data by analysis, can avoid the frequent pingpang handoff occurring in MLB process.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (3)
1. a method of avoiding producing pingpang handoff in the migration of LTE load balancing, is characterized in that: comprises the following steps,
Step 1, the load level of each community is periodically detected in the base station in LTE network, and the current area of establishing base station S detection is community s, judges whether community s transships, and is to enter step 2, otherwise process ends;
Step 2, base station S chooses some UE and issues A4 or A5 measurement configuration in the s of community, and the UE of configuration continues reporting measurement reports, and measurement report comprises RSRP and RSRQ, and described RSRP is Reference Signal Received Power, described RSRQ is Reference Signal Received Quality;
Step 3, in the time that base station S receives the measurement report that arbitrary UE reports, the measurement report that base station S reports from UE, obtains RSRP and the RSRQ of each adjacent area reporting;
Step 4, base station S obtains the load information of all adjacent areas of community s by X2 interface, report the each adjacent area relating to carry out respectively respective load and receive thresholding comparison for UE in step 3, and using load lower than receiving the adjacent area of thresholding as alternative object community, judge whether alternative object number of cells n is 0, if process ends, enters step 5 if not;
Step 5, the UE historical information of base station S inquiry reporting measurement reports, the UE persistent district that more whether has certain record of UE historical information is one of them of alternative object community in step 4, and switch reasons is to cover the switching causing, and residence time is very short; If it is establish this article and be recorded as m article, establishing this alternative object community is community d, enters step 6, enters if not step 8;
Step 6, base station S continues to search UE historical information backward, and relatively whether the UE persistent district of m+1 article of UE historical information record is home cell, is if it is judged as pingpang handoff, enters step 7, enters if not step 8;
Step 7, whether RSRP and the RSRQ of base station S comparison step two gained community d are greater than respectively RSRP and the RSRQ of the m+1 article of recording cell d of institute of UE historical information, if enter step 8, if otherwise process ends;
Step 8, base station S fills in Last Visited UTRAN Cell Information in the UE history IE of X2 HANDOVER REQUEST message, comprise interpolation cell destination cell RSRP and destination cell RSRQ RSRP and the RSRQ with recording step two gained community d, and send to the corresponding base station of community d.
2. the method for avoiding as claimed in claim 1 producing pingpang handoff in the migration of LTE load balancing, is characterized in that: in step 1, by judging whether cell load value is greater than threshold value and judges whether community transships.
3. the method for avoiding as claimed in claim 1 or 2 producing pingpang handoff in the migration of LTE load balancing, is characterized in that: in step 2, the UE that reports A2 measurement report is denoted as to edge UE, preferentially chooses edge UE sending measuring configuration.
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