CN105530671A - Method for inhibiting ping-pong handover and mobility management entity - Google Patents
Method for inhibiting ping-pong handover and mobility management entity Download PDFInfo
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- CN105530671A CN105530671A CN201510929284.7A CN201510929284A CN105530671A CN 105530671 A CN105530671 A CN 105530671A CN 201510929284 A CN201510929284 A CN 201510929284A CN 105530671 A CN105530671 A CN 105530671A
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- switching threshold
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
Abstract
The invention provides a method for inhibiting ping-pong handover and a mobility management entity. According to the method provided by the invention, if user equipment once resides in a target cell, when the user equipment is switched to the target cell, a preset threshold increment is added in a switching threshold of the target cell. In this way, for the same cell, if the user equipment is switched to the cell for multiple times, then the switching threshold of the cell will be gradually increased, resulting in that the difficulty of switching to the cell will be gradually increased, and by means of the manner, the ping-pong handover of the user equipment between cells can be effectively inhibited.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and the Mobility Management Entity that suppress pingpang handoff.
Background technology
3GPP (3rdGenerationPartnershipProject, third generation partner program) LTE (LongTermEvolution, Long Term Evolution) project be over the past two years 3GPP start maximum new technology development project, this with OFDM (OrthogonalFrequencyDivisionMultiplexing, orthogonal frequency division multiplexi)/FDMA (frequencydivisionmultipleaccess, frequency division multiple access) is core technology can be counted as " accurate 4G " technology.The main performance target of 3GPPLTE project comprises: the peak rate that can provide descending 100Mbps, up 50Mbps in 20MHz spectral bandwidth; Improve the performance of Cell Edge User; Improve cell capacity; Reduce system delay.
Often mutually covering common networking by the base station of heterogeneous same frequency or different frequency in actual sets Netcom becomes different Serving cell to UE (UserEquipment, subscriber equipment) seamless wireless service is provided, when UE is in two wireless signal intersection places, neighbor cell, due to UE distance base station distant, and also there is with minizone frequently the problem interfered with each other, cause edge UE often can not be served preferably, wireless signal belongs to radio wave signal, there is the problems such as reflection interference, UE is caused to receive wireless signal instability, UE may be caused to switch continually between Serving cell and neighbor cell, the Consumer's Experience of edge UE is worsened further.
Summary of the invention
An object of the present invention is to suppress subscriber equipment generation pingpang handoff.
First aspect, the invention provides a kind of method suppressing pingpang handoff, comprising:
When the history persistent district that Target cell is subscriber equipment, and when determining that signal quality difference reaches the current switching threshold in described Target cell, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell;
Base station to described Target cell sends and switches instruction, and by switching threshold current for described Target cell and predetermined threshold value increment with the switching threshold being updated to described Target cell.
Further, comprising:
When the history persistent district that Target cell is not subscriber equipment, and when determining that signal quality difference reaches default switching threshold, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell;
Base station to described Target cell sends and switches instruction, and records the history persistent district that described Target cell is described subscriber equipment, described default switching threshold is recorded as the switching threshold of described Target cell; Or, by described default switching threshold and predetermined threshold value increment and the switching threshold that is recorded as described Target cell.
Further, before sending switching instruction to the base station of described Target cell, described method also comprises:
Receive the handover request message that base station sends, reach the current switching threshold in described Target cell according to described handover request message determination signal quality difference; Described handover request message is used to indicate the difference of the channel quality value of Target cell and the channel quality value of Serving cell.
Described signal quality difference reach the current switching threshold in described Target cell and predetermined threshold value increment and.
Further, determine that described signal quality difference reaches the current switching threshold in described Target cell:
When signal quality difference reach the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference reaches the current switching threshold in described Target cell;
When signal quality difference do not reach the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference does not reach the current switching threshold in described Target cell.
Second aspect, the invention provides a kind of Mobility Management Entity, comprising:
Switching controls module, for when Target cell being the history persistent district of subscriber equipment, and signal quality difference is when reaching the current switching threshold in described Target cell, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell, and the base station to described Target cell sends and switches instruction;
Handover information maintenance module, for by switching threshold current for described Target cell and predetermined threshold value increment and the switching threshold that is updated to described Target cell.
Further, the history persistent district of described switching controls module also for when Target cell not being subscriber equipment, and signal quality difference reaches default switching threshold, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell; Base station to described Target cell sends and switches instruction;
Described default switching threshold also for recording the history persistent district that described Target cell is described subscriber equipment, is recorded as the switching threshold of described Target cell by described handover information maintenance module; Or, by described default switching threshold and predetermined threshold value increment and the switching threshold that is recorded as described Target cell.
Further, described switching controls module is also for before sending switching instruction to the base station of described Target cell, receive the handover request message that base station sends, reach the current switching threshold in described Target cell according to described handover request message determination signal quality difference; Described handover request message is used to indicate the difference of the channel quality value of Target cell and the channel quality value of Serving cell.
Described switching controls module also for reach when signal quality difference the current switching threshold in described Target cell and predetermined threshold value increment with, determine that described signal quality difference reaches the current switching threshold in described Target cell; When signal quality difference do not reach the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference does not reach the current switching threshold in described Target cell.
Further, described handover information maintenance module, also for for each subscriber equipment at least one subscriber equipment, when the quantity of history persistent district corresponding to this subscriber equipment reaches predetermined number, delete switching threshold corresponding to the history persistent district of wherein recording the earliest and this history persistent district.
In the present invention, if a subscriber equipment is once resident in Target cell, then when subscriber equipment being switched to this Target cell, switching threshold corresponding for this Target cell is increased predetermined threshold value increment.If a subscriber equipment is repeatedly switched to this community like this, the switching threshold that so this community is corresponding can increase gradually, thus cause the difficulty being switched to this community to increase gradually, just can effectively suppress subscriber equipment between cells pingpang handoff to occur in this way.
Accompanying drawing explanation
A kind of schematic flow sheet suppressing the method for pingpang handoff that Fig. 1 provides for one embodiment of the invention;
A kind of schematic flow sheet suppressing the method for pingpang handoff that Fig. 2 provides for one embodiment of the invention;
The schematic diagram of a kind of application scenarios of the method for the suppression pingpang handoff that Fig. 3 provides for one embodiment of the invention;
The schematic flow sheet of the method for the suppression pingpang handoff that Fig. 4 provides for one embodiment of the invention;
A kind of schematic flow sheet suppressing the method for pingpang handoff that Fig. 5 provides for one embodiment of the invention;
The structural representation of a kind of Mobility Management Entity that Fig. 6 provides for one embodiment of the invention;
The structural representation of a kind of base station that Fig. 7 provides for one embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
First aspect, one embodiment of the invention provides a kind of method suppressing pingpang handoff, can by MME (MobilityManagementEntity, Mobility Management Entity) perform, effectively can suppress the problem of the pingpang handoff occurred in S1 switches, see Fig. 1, the method comprises:
Step S01, when the history persistent district that Target cell is subscriber equipment, and when determining that signal quality difference reaches the current switching threshold in described Target cell, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell, and the base station to described Target cell sends and switches instruction;
Step S02, by switching threshold current for described Target cell and predetermined threshold value increment and the switching threshold that is updated to described Target cell.
In method provided by the invention, if a subscriber equipment is once resident in Target cell, then when subscriber equipment being switched to this Target cell, switching threshold corresponding for this Target cell is increased predetermined threshold value increment, like this for same community, if a subscriber equipment is repeatedly switched to this community, the switching threshold that so this community is corresponding can increase gradually, thus cause the difficulty being switched to this community to increase gradually, just can effectively suppress subscriber equipment between cells pingpang handoff to occur in this way.
Understandable, history persistent district here can refer to the community that subscriber equipment is once resident, and in the specific implementation, MME can determine that whether a community is the history persistent district of a subscriber equipment in several ways.Such as, history persistent district here can be determined according to the input of user, or also can be the community that MME equipment records when sending for this subscriber equipment switch instruction to Target cell.When realizing according to rear a kind of mode, above-mentioned method can also comprise following flow process:
Step S03, when Target cell is not the history persistent district of subscriber equipment, and when determining that signal quality difference reaches default switching threshold, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell; Base station to described Target cell sends and switches instruction;
Step S04, records the history persistent district that described Target cell is described subscriber equipment, described default switching threshold is recorded as the switching threshold of described Target cell; Or, by described default switching threshold and predetermined threshold value increment and the switching threshold that is recorded as described Target cell.
By such mode, automatically can determine which community is history persistent district.Decrease manual intervention.Understandablely be, in the specific implementation, here there is no inevitable precedence relationship between step S01, S02, between step S03 and step S04, there is no inevitable precedence relationship yet, and between step S01-step S02 and step S03-step S04, there is no inevitable sequencing yet.
In the specific implementation, signal quality difference here refers to the difference that the channel quality value that the channel quality value of Target cell deducts Serving cell obtains.
In the specific implementation, before above-mentioned step S01 and step S03, in described method, can also comprise and determine whether signal quality difference reaches the process of the current switching threshold in described Target cell.Specifically, determine whether signal quality difference reaches the current switching threshold in described Target cell and can refer to and determine whether this difference is more than or equal to this switching threshold here.If so, then abundant better than the channel quality of Serving cell of the channel quality of Target cell is described, can switches.Otherwise illustrate that the channel quality of Target cell and the channel quality of Serving cell are more or less the same, that carries out switching has little significance.Or, in the specific implementation, also can determine whether described signal quality difference reaches the current switching threshold in described Target cell in the following manner: when signal quality difference be more than or equal to the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference reaches the current switching threshold in described Target cell; When signal quality difference be less than the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference does not reach the current switching threshold in described Target cell.Corresponding technical scheme also can realize basic object of the present invention, also should fall into protection scope of the present invention.
When concrete enforcement, the channel quality of Serving cell here and the channel quality of Target cell can obtain by asking the subscriber equipment measurement carrying out cell merge, and being sent to the base station corresponding to Serving cell of this subscriber equipment, this base station can generate according to the measured value of user equipment to report the handover request message comprising the information being used to indicate the channel quality of Serving cell and the channel quality of Target cell.
Now, the network environment of handover request message determination subscriber equipment that MME can be sent by the source base station receiving subscriber equipment whether meet in step S01 " Target cell is the history persistent district of subscriber equipment; and signal quality difference reaches the current switching threshold in described Target cell " switching condition of " when Target cell is not the history persistent district of subscriber equipment, and signal quality difference reaches the current switching threshold in described Target cell " in switching condition and/or step S03.
Understandable, the switching instruction in above-mentioned step S02 and step S04 all refers to the instruction for making Target cell perform corresponding handover operation.Here corresponding handover operation can refer to as corresponding channel resource etc. reserved by subscriber equipment.The base station of Target cell performs corresponding handover operation to complete corresponding handoff procedure according to this switching instruction.In actual applications, can carry the information such as user ID in switching instruction here, switch concrete this of instruction and how to arrange, when can switch with reference to carrying out in prior art S1, be sent to the switching instruction of Target cell, the present invention no longer describes in detail at this.
In the specific implementation, the size of the default switching threshold in predetermined threshold value increment, step S03 and step S04 in above-mentioned step S02 can set according to actual conditions, such as when above-mentioned signal quality value is RSRP, above-mentioned predetermined threshold value increment can be 2db.And the predetermined threshold value increment in step S02 may be different from the default switching threshold in step S03 and step S04, and when performing step S02, different according to the switching threshold that Target cell is current, predetermined threshold value increment also may be different.When the switching threshold that Target cell is corresponding is larger, predetermined threshold value increment can be a larger value, and when switching threshold corresponding to Target cell is less, predetermined threshold value increment can be a less value.Or as required, when the switching threshold that Target cell is corresponding is less, predetermined threshold value increment can be a larger value, and when switching threshold corresponding to Target cell is larger, predetermined threshold value increment can be a less value.Corresponding technical scheme all can reach basic object of the present invention, also should fall into protection scope of the present invention.
In the specific implementation, in above-mentioned step S04, record object community is that the history persistent district of described subscriber equipment can refer to and this Target cell (cell ID) added in the history persistent district list of this subscriber equipment, and the switching threshold above-mentioned default switching threshold being recorded as Target cell corresponding in this history persistent district list.Like this in step S02, by switching threshold current for Target cell and predetermined threshold value increment and the switching threshold that is updated to described Target cell can refer to the switching threshold upgrading the Target cell of recording in above-mentioned history persistent district list.
In the specific implementation, the method for above-described embodiment one can also comprise not shown:
Step S05, for each subscriber equipment at least one subscriber equipment, when the quantity of history persistent district corresponding to this subscriber equipment reaches predetermined number, delete switching threshold corresponding to the history persistent district of wherein recording the earliest and this history persistent district.
The resource storing history persistent district and consume with corresponding switching threshold can be reduced in this way.And the situation of reality is, subscriber equipment generally rests in a specific region within a specific time period, and the history persistent district of storing excess is for improving the effect suppressing pingpang handoff, few of realistic meaning.
In the specific implementation, in above-mentioned step S05, can be judge when new record history persistent district whether the quantity of the history persistent district that this recorded community is corresponding reaches predetermined number, and when being judged as YES, a deletion record history persistent district the earliest and the switching threshold of correspondence.Or in the specific implementation, in above-mentioned step S05, also can be judge whether the quantity of the history persistent district that this community of recording is corresponding reaches predetermined number according to the cycle of presetting, if so, X (X is the number exceeded) the history persistent district and corresponding switching threshold of recording the earliest is then deleted.
Further, above-mentioned predetermined number can be specially 3.According to networking mode general at present, specific region is covered by the Serving cell that three base stations are corresponding at most, so only retains the pingpang handoff that three history persistent districts can suppress subscriber equipment.Resource consumption can be reduced further like this.
Understandable, there is no inevitable precedence relationship between each step in step S05 here and above-mentioned step S01-step S04 yet.
In the specific implementation, in above-mentioned method, also may comprise the deterministic process whether meeting other switching conditions (load balancing etc.), MME sends when judging that current network environment also meets these switching conditions to switch instruction.These deterministic processes can be carried out before each step described in the embodiment of the present invention, if be judged as NO, then process ends, no longer performs each deterministic process described in the embodiment of the present invention, if when being judged as, performing each deterministic process described in this inventive embodiments.
Below in conjunction with another embodiment step S03-step S04 also comprised to above-mentioned method and determine whether that the situation meeting the switching condition described in step S01 and step S02 is described by the handover request message that the source base station receiving subscriber equipment sends, see Fig. 2, the method can comprise following flow process:
Step S11, receives the handover request message that base station sends, determines to be switched subscriber equipment, Target cell, the channel quality value of Serving cell and the channel quality value of Target cell according to described handover request message; The information of to be switched subscriber equipment, Target cell, the channel quality of Serving cell and the channel quality of Target cell is used to indicate in described handover request message;
Step S12, judges that whether described Target cell is the history persistent district of described subscriber equipment, obtains the first judged result; When described first judged result is for being, turn to step S13; Otherwise turn to step S15;
Step S13, judges whether signal quality difference reaches the current switching threshold in described Target cell, obtains the second judged result; The difference of the described channel quality value of signal quality difference Target cell and the channel quality value of Serving cell; When the second judged result is for being, turn to step S14; When the second judged result is no, process ends;
Step S14, the base station to Target cell sends and switches instruction, and by switching threshold current for Target cell and predetermined threshold value increment with the switching threshold being updated to described Target cell;
Step S15, judges that the signal quality difference of Serving cell is no and reaches default switching threshold, obtain the 3rd judged result; When described 3rd judged result is for being, turn to step S16; Otherwise, process ends;
Step S16, the base station to Target cell sends and switches instruction, and records the history persistent district that described Target cell is described subscriber equipment, described default switching threshold is recorded as the switching threshold of described Target cell.
In method provided by the invention, if a subscriber equipment is once resident in Target cell, then when subscriber equipment being switched to this Target cell, switching threshold corresponding for this Target cell is increased predetermined threshold value increment, if a subscriber equipment is never resident in Target cell, then after this subscriber equipment is switched to this Target cell, record this subscriber equipment resident in this Target cell.Like this for same community, if a subscriber equipment is repeatedly switched to this community, the switching threshold that so this community is corresponding can increase gradually, thus cause the difficulty being switched to this community to increase gradually, just can effectively suppress subscriber equipment between cells pingpang handoff to occur in this way.
In the specific implementation, the handover request message in above-mentioned step S11 can specifically refer to that base station sends to MME, carries out the message of cell merge scheduling for asking Mobility Management Entity to be switched subscriber equipment.With handover request message (handoverrequest) of the prior art unlike, in the embodiment of the present invention, also include the information being used to indicate the channel quality of Serving cell and the channel quality of Target cell in handover request message, make MME can determine the channel quality value of Serving cell and the channel quality value of Target cell according to this handover request message.Specifically, the information being used to indicate the channel quality value of Serving cell here and be used to indicate the information of channel quality value of Target cell, can carry out for subscriber equipment the measured value that channel measurement obtains.Can be such as measure the RSRP (ReferenceSignalReceivingPower, Reference Signal Received Power) and/or RSRQ (ReferenceSignalReceivingQuality, Reference Signal Received Quality) that obtain.Certainly in actual applications; the above-mentioned information being used to indicate the channel quality of Serving cell also can be the information of other types with the information of the channel quality being used to indicate Target cell; under the prerequisite of the information of the information of channel quality and the channel quality of indicating target community that can indicate Serving cell; which kind of type is these information be specially can't affect enforcement of the present invention, also should fall into protection scope of the present invention accordingly.
In the specific implementation, the information being used to indicate subscriber equipment in step S11 can be specially the customer equipment identification (userID) of subscriber equipment or other can the information of unique identification subscriber equipment, the information being used to indicate Target cell then can for the cell ID (cellID) of Target cell or other can the information of unique identification Target cell.
Understandablely be, in the first judged result in the present invention, the second judged result and the 3rd judged result first, second, and third is only that judged result for producing different deterministic process is distinguished, instead of refers in particular to the result of determination of "Yes" or "No".
Second aspect, one embodiment of the invention provides the another kind of method suppressing pingpang handoff, and the method can be performed by base station, and see Fig. 3, the method can comprise:
Step S21, receives the A3 event of user equipment to report;
Step S22, sends handover request message to MME; Described handoff request message is containing the information being used to indicate to be switched subscriber equipment, Target cell, the channel quality of Serving cell and the channel quality of Target cell.
In the embodiment of the present invention, the information of the channel quality of Serving cell and the channel quality of Target cell is also included in handover request message, make MME can determine the channel quality value of Serving cell and the channel quality value of Target cell according to this handover request message, and then the method for the threshold value pingpang handoff described in first aspect can be performed.Specifically, the information being used to indicate the channel quality of Serving cell here and be used to indicate the information of channel quality of Target cell, can carry out for subscriber equipment the measured value that channel measurement obtains.Can be such as measure the RSRP (ReferenceSignalReceivingPower, Reference Signal Received Power) and/or RSRQ (ReferenceSignalReceivingQuality, Reference Signal Received Quality) that obtain.Certainly in actual applications; the above-mentioned information being used to indicate the channel quality of Serving cell also can be the information of other types with the information of the channel quality being used to indicate Target cell; under the prerequisite of the information of the information of channel quality and the channel quality of indicating target community that can indicate Serving cell; which kind of form is these information be embodied in can't affect enforcement of the present invention, also should fall into protection scope of the present invention accordingly.
Here A3 event can be consistent with understanding of the prior art, i.e. the service quality (RSRP/RSRQ) of a neighbor cell absolute thresholding higher than the service quality of Serving cell.The concrete definition of A3 time can with reference in 3GPP36.331 about the regulation of A3 event.
When concrete enforcement, the channel quality of Serving cell here and the channel quality of Target cell can obtain by asking the subscriber equipment measurement carrying out cell merge, and being sent to the base station corresponding to Serving cell of this subscriber equipment, this base station can generate according to the measured value of user equipment to report the handover request message comprising the information being used to indicate the channel quality of Serving cell and the channel quality of Target cell.
Be described in detail below in conjunction with the idiographic flow of a kind of concrete application scenarios to wherein a kind of execution mode of the method for the suppression pingpang handoff described in first aspect and second aspect, see Fig. 4, suppose the current community C1 being in base station N1 of subscriber equipment U1, the overlapping region of the community C2 of base station N2 and the community C3 of base station N3, and suppose that the current service cell of subscriber equipment U1 is C1, due to the channel quality degrades in the C1 of community, subscriber equipment U1 carries out channel quality measurement, and (that suppose measurement is adjacent cell C2, the RSRP value of C3 and Serving cell C1) obtain community C2 RSRP value maximum, and report A3 event to base station N1, see Fig. 5, the method can specifically comprise:
Step S41, base station N1 receive the A3 event that subscriber equipment U1 reports, rear steering step S42.
Here the A3 event reported refers to that subscriber equipment U1 have sent corresponding message to base station N1, and request switches.The information such as RSRP value of the customer equipment identification of subscriber equipment U1, the cell ID of Target cell C2, the RSRP value of Target cell C2 and Serving cell can be comprised in the message of A3 reporting events.The particular content reported with reference to prior art, no longer can describe in detail at this.
Step S42, base station N1 determines that Target cell is C2, and send handover request message to MME, carry the RSRP value R1 of the device identification UID of subscriber equipment U1, the cell ID CID of Target cell C2, the RSRP value R2 of Target cell C2 and Serving cell C1 in this handover request message, rear steering step S43.
Step S43, MME receive the handover request message that base station sends, according to device identification UID, the cell ID CID of Target cell C2 of this handover request message determination subscriber equipment U1, the RSRP value R1 of the RSRP value R2 of Target cell C2 and Serving cell C1; Rear steering step S44.
Step S44, MME judge whether the cell ID CID of Target cell C2 is present in the history persistent district list corresponding to device identification UID of subscriber equipment; If so, then step S45 is turned to; If not, then step S47 is turned to.
Step S45, MME judge whether the difference of the RSRP value R2 of Target cell C2 and the RSRP value of Serving cell reaches Target cell C2 switching threshold current in the list of history persistent district; If so, step S46 is turned to; If not, then process ends;
Step S46, MME sends to the base station N2 that Target cell C2 is corresponding and switches instruction, and in the history persistent district list corresponding to the device identification UID of subscriber equipment U1, by the value of switching threshold T current for Target cell C2 and predetermined threshold value increment △ T and be updated to the switching threshold T of Target cell, even T=T+ △ T.
Step S47, MME judge whether the difference of the RSRP value R2 of Target cell C2 and the RSRP value R1 of Serving cell reaches default switching threshold T0; If so, step S48 is turned to, if not, then process ends.
Step S48, MME send to base station N2 corresponding to Target cell C2 and switch instruction, rear steering step S49;
Step S49, MME judge whether the history persistent district in the history persistent district list that the customer equipment identification UID of subscriber equipment U1 is corresponding reaches predetermined number 3; If so, then step S410 is turned to; If not, step S411 is turned to;
Step S410, MME delete the cell ID that is recorded to the earliest in the list of history persistent district and switching threshold corresponding to this cell ID, rear steering step S411.
Step S411, the cell ID UID of Target cell C2 adds in history persistent district list corresponding to subscriber equipment U1 by MME, and is recorded in this history persistent district list as the switching threshold that the cell ID UID of Target cell C2 is corresponding by this default switching threshold T0.Process ends afterwards.
After step S46 or S48, the base station N2 of Target cell C2, can according to the corresponding handoff procedure of flow performing of setting after receiving switching instruction, and corresponding contents see prior art, no longer can describe in detail at this.
The third aspect, one embodiment of the invention provides a kind of MME, and see Fig. 6, this MME comprises:
Switching controls module 51, for when Target cell being the history persistent district of subscriber equipment, and signal quality difference is when reaching the current switching threshold in described Target cell, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell, and the base station to described Target cell sends and switches instruction;
Handover information maintenance module 52, for by switching threshold current for described Target cell and predetermined threshold value increment and the switching threshold that is updated to described Target cell.
Further, switching controls module 51 can also be used for when Target cell is not the history persistent district of subscriber equipment, and signal quality difference reaches the current switching threshold in described Target cell, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell; Base station to described Target cell sends and switches instruction;
Now handover information maintenance module can also be used for recording the history persistent district that described Target cell is described subscriber equipment, described default switching threshold is recorded as the switching threshold of described Target cell.
Further, handover information maintenance module 52, also for for each subscriber equipment at least one subscriber equipment, when the quantity of history persistent district corresponding to this subscriber equipment reaches predetermined number, delete switching threshold corresponding to the history persistent district of wherein recording the earliest and this history persistent district.
In some alternative embodiments, in the above-described embodiment, the switching threshold described default switching threshold being recorded as described Target cell can replace with: by described default switching threshold and predetermined threshold value increment and the switching threshold that is recorded as described Target cell.Or, above-mentioned signal quality difference reach the current switching threshold in described Target cell can replace with signal quality difference reach the current switching threshold in described Target cell and predetermined threshold value increment and.
Fourth aspect, the invention provides an embodiment and provide a kind of base station, may be used for the method for the suppression pingpang handoff performed described in second aspect, see Fig. 7, this base station comprises: reporting module 61, for receive user equipment to report in base station A3 event after, send handover request message to MME; Described handoff request message is containing the information being used to indicate to be switched subscriber equipment, Target cell, the channel quality of Serving cell and the channel quality of Target cell.
5th aspect, the invention provides a kind of communication system, it is characterized in that, comprises the MME described in first aspect and the base station described in second aspect.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. suppress a method for pingpang handoff, it is characterized in that, comprising:
When the history persistent district that Target cell is subscriber equipment, and, when determining that signal quality difference reaches the current switching threshold in described Target cell, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell;
Base station to described Target cell sends and switches instruction, and by switching threshold current for described Target cell and predetermined threshold value increment with the switching threshold being updated to described Target cell.
2. method according to claim 1, is characterized in that, comprising:
When the history persistent district that Target cell is not subscriber equipment, and when determining that signal quality difference reaches default switching threshold, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell;
Base station to described Target cell sends and switches instruction, and records the history persistent district that described Target cell is described subscriber equipment, described default switching threshold is recorded as the switching threshold of described Target cell; Or, by described default switching threshold and predetermined threshold value increment and the switching threshold that is recorded as described Target cell.
3. method as claimed in claim 1 or 2, is characterized in that, before sending switching instruction to the base station of described Target cell, described method also comprises:
Receive the handover request message that base station sends, reach the current switching threshold in described Target cell according to described handover request message determination signal quality difference; Described handover request message is used to indicate the difference of the channel quality value of Target cell and the channel quality value of Serving cell.
4. the method for claim 1, is characterized in that, describedly determines that described signal quality difference reaches the current switching threshold in described Target cell, comprising:
When signal quality difference reach the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference reaches the current switching threshold in described Target cell;
When signal quality difference do not reach the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference does not reach the current switching threshold in described Target cell.
5. the method for claim 1, is characterized in that, described method also comprises:
For each subscriber equipment at least one subscriber equipment, when the quantity of history persistent district corresponding to this subscriber equipment reaches predetermined number, delete switching threshold corresponding to the history persistent district of wherein recording the earliest and this history persistent district.
6. a Mobility Management Entity, is characterized in that, comprising:
Switching controls module, for when Target cell being the history persistent district of subscriber equipment, and when determining that signal quality difference reaches the current switching threshold in described Target cell, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell, and the base station to described Target cell sends and switches instruction;
Handover information maintenance module, for by switching threshold current for described Target cell and predetermined threshold value increment and the switching threshold that is updated to described Target cell.
7. Mobility Management Entity as claimed in claim 6, it is characterized in that, the history persistent district of described switching controls module also for when Target cell not being subscriber equipment, and when determining that signal quality difference reaches default switching threshold, wherein, described signal quality difference is the difference of the channel quality value of Target cell and the channel quality value of Serving cell; Base station to described Target cell sends and switches instruction;
Described default switching threshold also for recording the history persistent district that described Target cell is described subscriber equipment, is recorded as the switching threshold of described Target cell by described handover information maintenance module; Or, by described default switching threshold and predetermined threshold value increment and the switching threshold that is recorded as described Target cell.
8. Mobility Management Entity as claimed in claims 6 or 7, it is characterized in that, described switching controls module is also for before sending switching instruction to the base station of described Target cell, receive the handover request message that base station sends, reach the current switching threshold in described Target cell according to described handover request message determination signal quality difference; Described handover request message is used to indicate the difference of the channel quality value of Target cell and the channel quality value of Serving cell.
9. Mobility Management Entity as claimed in claim 6, it is characterized in that, described switching controls module also for reach when signal quality difference the current switching threshold in described Target cell and predetermined threshold value increment with, determine that described signal quality difference reaches the current switching threshold in described Target cell; When signal quality difference do not reach the current switching threshold in described Target cell and predetermined threshold value increment and, determine that described signal quality difference does not reach the current switching threshold in described Target cell.
10. Mobility Management Entity as claimed in claim 6, it is characterized in that, described handover information maintenance module, also for for each subscriber equipment at least one subscriber equipment, when the quantity of history persistent district corresponding to this subscriber equipment reaches predetermined number, delete switching threshold corresponding to the history persistent district of wherein recording the earliest and this history persistent district.
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Address after: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 juyuanzhou Industrial Park, 19 floor Patentee after: RUIJIE NETWORKS Co.,Ltd. Address before: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 juyuanzhou Industrial Park, 19 floor Patentee before: Beijing Star-Net Ruijie Networks Co.,Ltd. |