CN103763730A - Wireless link failure recovery enhancing method and device based on optimal reconstruction target cell selection - Google Patents

Wireless link failure recovery enhancing method and device based on optimal reconstruction target cell selection Download PDF

Info

Publication number
CN103763730A
CN103763730A CN201410064314.8A CN201410064314A CN103763730A CN 103763730 A CN103763730 A CN 103763730A CN 201410064314 A CN201410064314 A CN 201410064314A CN 103763730 A CN103763730 A CN 103763730A
Authority
CN
China
Prior art keywords
cell
community
rsrp
target
mobile terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410064314.8A
Other languages
Chinese (zh)
Other versions
CN103763730B (en
Inventor
陈前斌
刘伊莎
唐伦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing University of Post and Telecommunications
Original Assignee
Chongqing University of Post and Telecommunications
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing University of Post and Telecommunications filed Critical Chongqing University of Post and Telecommunications
Priority to CN201410064314.8A priority Critical patent/CN103763730B/en
Publication of CN103763730A publication Critical patent/CN103763730A/en
Application granted granted Critical
Publication of CN103763730B publication Critical patent/CN103763730B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

The invention discloses a wireless link failure recovery enhancing method and device based on optimal reconstruction target cell selection, and belongs to the technical field of mobile communication. The wireless link failure recovery enhancing method includes the steps of determining a first forecasting target cell and a second forecasting target cell according to continuously-measured-and-calculated RSRP gradient values of adjacent base stations, obtaining prepared cells according to a switching command of a service base station, ranking a prepared cell list according to the priority based on the proximity of base stations of the prepared cells and movement paths, and early terminating a T310 timer based on a switching executing event. According to the wireless link failure recovery enhancing method and device, the same probability of the forecasting target cells and the targets cells and the frequency spectrum efficiency are improved, the network signaling cost is reduced, and the signaling process is optimized; meanwhile, the query efficiency of the RRC connection reconstruction target cells in the prepared cell list is improved, namely the reconstruction success rate is improved, and the break period is shortened.

Description

The Radio Link Failure of selecting based on optimal reconstruction Target cell recovers Enhancement Method and device
Technical field
The invention belongs to mobile communication technology field, relate to a kind of Radio Link Failure of selecting based on optimal reconstruction Target cell and recover Enhancement Method and device.
Background technology
For adapting to the Mobile data flow of rapid growth, operator has disposed more infrastructure, make cellular network from UEs more close to, and then increase spectrum efficiency and space reuse degree.In the face of this situation, 3GPP tissue proposes the isomery cellulor network being comprised of macrocell and low power nodes (as picocells, femtocells, relaynodes).Yet the simulation result to mobile robustness under isomery cellulor network proposing according to 3GPPRAN2 can obtain, the performance of handoffs under heterogeneous network is far from the good of traditional homogenous networks, and handover failure rate HOF and pingpang handoff rate Ping-pong increase greatly.Simulation result has also been shown the wireless link failure rate RLF of mobile subscriber under isomery cellulor network, and the handoff failure HOF that analysis can obtain has in a large number caused a large amount of wireless link inefficacy RLF.In addition, also for the user equipment (UE) under high-speed moving state (UserEquipment), analyze especially, find the non-constant of performance of handoffs of the high speed UE in heterogeneous network, easily cause RLF, even if it can find suitable community to carry out RLF recovery, also can cause a large amount of out of service times and extra signalling.Therefore, RLF recovers to strengthen and is put on the agenda, and hope can find suitable method further to reduce RLF probability of happening, and in RLF recovery process, reduces the out of service time of initiation as far as possible.
The method that prior art has proposed a kind of " in advance for UE chooses a plurality of preparation district ".The main thought of the method is, the base station, current service cell of mobile subscriber equipment is before switching generation, according to the prediction trigger mechanism of certain preparation district in advance for UE chooses a plurality of preparation district, asking these preparation district is that the switching of UE is prepared, and the system information of these preparation district, RRC grade configuration information and designated bearing information in advance by extra signaled UE.
The prediction trigger mechanism of existing preparation district is: the signal strength signal intensity that measures certain community as UE is higher than certain threshold value, or lower than the signal strength signal intensity of UE current service cell, but difference is while being less than certain threshold value, and Jiang Gai community is defined as preparation district.
There are a lot of defects in the selection criterion of existing preparation district prediction trigger mechanism and preparation district, because, when UE is when cell edge moves, if select preparation district based on signal strength signal intensity higher than certain threshold value, selected preparation district is not probably that UE is about to the neighbor cell moving into, and is a nearest neighbor cell of the UE current location left and right sides.Therefore, in prior art preparation district to be chosen to power lower, cause unnecessary resource reservation behavior, reduced the availability of frequency spectrum.Meanwhile, after preparation district is determined, need to use extra signaling by the information notification UE of preparation district, also greatly increase network signaling overhead.
The method of Fast Reconstruction under a kind of failed handoff scenario has also been proposed in prior art---shorten T310 timer.The main thought of the method is that the handoff failure HOF under heterogeneous network occurs in handoff preparation phase mostly, and main cause is switching command bust this, and the transmission mortality of handover measurement report is lower.Therefore, Target cell may be ready to UE to access.For UE, until the overtime just triggering of T310 RRC rebuilds, be connected to target BS so, just seeming need not.Therefore, before UE triggers the RRC process of reconstruction with optimum subdistrict, uses a shorter RLF timer T310, make UE trigger quickly RRC and rebuild, minimizing user data break period.This technology can not guarantee that Target cell has been ready to the context of UE, can not guarantee that the selected community of having prepared of UE is a suitable community.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of Radio Link Failure of selecting based on optimal reconstruction Target cell to recover Enhancement Method and device.
For achieving the above object, the invention provides following technical scheme:
A kind of Radio Link Failure of selecting based on optimal reconstruction Target cell recovers Enhancement Method, comprise the following steps: 1) Current Serving BTS of mobile terminal continues to obtain the measurement of mobile terminal to the signal quality of this base station, analyze described mobile terminal and whether need to start to carry out the handover measurement to adjacent base station, if desired, carry out 2) step; If do not need, continue to carry out 1) step; 2) mobile terminal continues to obtain the measured value to the RSRP of all adjacent base stations; 3) completing when the n time RSRP of adjacent base station measured, obtain and record the RSRP Grad Gradient of the n-1 time to the n time measurement of all adjacent base stations n-1, n(n=2,3,4 ...); 4) according to the signal quality of the Current Serving BTS of mobile terminal, judge whether to have started target of prediction community, if can, carry out 5) step; If cannot, carry out 2) step; 5), when described Target cell predicted events meets, obtain the cell ID of maximum RSRP gradient community and time large RSRP gradient community; 6), according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, determine the cell ID of the first target of prediction community and the second target of prediction community; 7) obtain the current translational speed of described mobile terminal; 8) translational speed current according to described mobile terminal, obtains Pre-handoff and prepares trigger event EarlyPreparEvent; 9) when Pre-handoff preparation trigger event EarlyPreparEvent meets, mobile terminal sends Pre-handoff and prepares indication Early_HO_Prepar_IND to base station, current service cell, described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community, so that Pre-handoff beamhouse operation is carried out according to the cell ID of the first target of prediction community and the second target of prediction community and target of prediction community in base station, current service cell; 10) receive Pre-handoff instruction Early_HO_CMD, in described Pre-handoff instruction, carry the ready cell ID of having prepared community; 11) obtain the priority of preparing community, generate and back up and prepared cell list Prepared-cell_list; 12) translational speed current according to described mobile terminal, obtains and switches execution event ExeEvent; 13) when switching execution event ExeEvent and meet, based on ExeEvent premature termination T310 timer and state RLF; 14), when the cell ID of Target cell that meets Exe Event is identical with the cell ID of having prepared community in Prepared-cell_list, selecting has the Target cell of like-identified to carry out RRC connection reconstruction in Prepared-cell_list; 15) when the cell ID of Target cell that meets ExeEvent is different from the cell ID of having prepared community in Prepared-cell_list, right
RRC connection reconstruction is carried out according to the suitable community of priority sequential search from high to low in Prepared-cell_list Zhong community.
Further, described mobile terminal continues to obtain the measured value to the RSRP of all adjacent base stations, specifically comprises: described mobile terminal is positioned at wireless link inefficacy RLF hotspots; Described wireless link inefficacy RLF hotspots provides radio communication service by a macrocell macrocell and several Microcells picocell; The current access base station of described mobile terminal is a microcell base station PeNB under macrocellular covers; Described adjacent base station can be the macro cell base station MeNB that covers service Microcell, can be also adjacent microcell base station PeNB.
Further, in step 3), complete when the n time RSRP of adjacent base station measured, obtain and record the RSRP Grad of measuring for the n-1 time to the n time of all adjacent base stations, specifically comprise: complete when the n time RSRP of adjacent base station measured, obtain the described mobile terminal the n-1 time RSRP measured value to described all adjacent base stations; Obtain the described mobile terminal the n time RSRP measured value to described all adjacent base stations; According to described the n-1 time measured value, described the n time measured value and RSRP, measure the RSRP Grad Gradientn-1 that interval of delta t calculates respectively all adjacent base stations, n(n=2,3,4 ...); By the respective cell sign ID and the RSRP variable gradient value Gradientn-1 thereof that comprise all adjacent base stations, n(n=2,3,4 ...) information table be defined as RSRP gradient table; By the RSRP Grad Gradientn-1 of all adjacent base stations, n(n=2,3,4 ...) be recorded in RSRP gradient table.
Further, in step 5), when described Target cell predicted events meets, obtain the cell ID of maximum RSRP gradient community and time large RSRP gradient community, specifically comprise: inquiry RSRP gradient table, obtains the cell ID ID1 of two Grad respective cell maximum in the RSRP Grad of each record n-1, n, ID2 n-1, n; Inquire about all ID1 n-1, n, filter out the cell ID ID1 that occurrence number is maximum, ID1 is defined as to the cell ID of maximum RSRP gradient community; Inquire about all ID2 n-1, n, filter out the cell ID ID2 that occurrence number is maximum, ID2 is defined as to time cell ID of large RSRP gradient community.
Further, in step 6), according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, the cell ID of determining the first target of prediction community and the second target of prediction community, specifically comprises: the cell ID that the cell ID of maximum RSRP gradient community is defined as to the first target of prediction community; The cell ID of inferior large RSRP gradient community is defined as to the cell ID of the second target of prediction community.
Further, the translational speed current according to described mobile terminal, obtains Pre-handoff and prepares trigger event EarlyPrepar Event, specifically comprises: obtain the current translational speed of described mobile terminal; Inquiry movement speed v-EarlyPreparEvent mapping table, obtains corresponding EarlyPreparEvent according to the translational speed of described mobile terminal; Described EarlyPrepar Event is set to the A3 event (TTT=0ms) that offset value is less.
Further, in step 11), obtain the priority of preparing community, generate and back up and prepared cell list
Prepared-cell_list, specifically comprises: inquiry RSRP gradient table, described in obtaining, prepared the up-to-date RSRP Grad of community; The priority of preparing community of up-to-date RSRP Grad maximum is defined as to 1; The up-to-date RSRP Grad time large priority of preparing community is defined as to 2; According to described cell ID and the priority of having prepared community, generate and back up and prepared cell list Prepared-cell_list.
Further, the translational speed current according to described mobile terminal, obtains and switches execution event ExeEvent, specifically comprises: obtain the current translational speed of described mobile terminal; Inquiry movement speed v-ExeEvent mapping table, obtains corresponding ExeEvent according to the translational speed of described mobile terminal; The A3 event (TTT=0ms) that offset value is larger is defined as switching execution event ExeEvent.
Further, according to the cell ID of described the first target of prediction community and the second target of prediction community, to described the first target of prediction community and the second target of prediction community, send Pre-handoff preparation request signaling Early_HO_Prepar_Request, obtain the channel resource of the first target of prediction community and the second target of prediction community; Receiving while preparing to confirm signaling from the Pre-handoff of target of prediction community, described Pre-handoff is prepared to confirm that the cell ID carrying in signaling Early_HO_Prepar_ACK is defined as preparing the cell ID of community; To described mobile terminal, send switching command HO_CMD, in described switching command, carry the cell ID of preparing community.
The present invention also provides a kind of Radio Link Failure of selecting based on optimal reconstruction Target cell to recover intensifier, comprises a kind of mobile terminal and a kind of base station;
Described mobile terminal comprises: RSRP memory cell, for continuing to obtain the measured value to the RSRP of all adjacent base stations;
RSRP gradient memory cell, for calculating RSRP Grad, and stores RSRP gradient table; The first acquiring unit, for obtaining the cell ID of maximum RSRP gradient community and time large RSRP gradient community; The first determining unit, for determining the cell ID of the first target of prediction community and the second target of prediction community; Second acquisition unit, for obtaining the current translational speed of described mobile terminal; The 3rd acquiring unit, for the translational speed current according to described mobile terminal, obtains Pre-handoff and prepares trigger event EarlyPreparEvent; Early_HO_Prepar_IND transmitting element, be used for sending Pre-handoff and prepare indication, described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community, so that Pre-handoff beamhouse operation is carried out according to cell ID and the target of prediction community of described the first target of prediction community and the second target of prediction community in base station, current service cell; Early_HO_CMD receiving element, for receiving Pre-handoff instruction Early_HO_CMD, carries the ready cell ID of having prepared community in described Pre-handoff instruction; Prepare cell information memory cell, for generating and backing up, prepared cell list Prepared-cell_list; The 4th acquiring unit, for the translational speed current according to described mobile terminal, obtains and switches execution event ExeEvent; T310 premature termination trigger element, for when switching execution event ExeEvent and meet, based on ExeEvent premature termination T310 timer and state RLF;
Described base station comprises: Early_HO_Prepar_IND receiving element, for receiving Pre-handoff, prepare indication, and described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community; Pre-handoff is prepared performance element, for according to the cell ID of the cell ID of the first target of prediction community and the second target of prediction community, carries out Pre-handoff beamhouse operation with described the first target of prediction community and the second target of prediction community; Early_HO_Prepar_Request transmitting element, for sending Pre-handoff preparation request signaling; Early_HO_Prepar_ACK receiving element, confirms signaling for receiving Pre-handoff preparation request; Early_HO_CMD transmitting element, for sending Pre-handoff instruction Early_HO_CMD, carries the ready cell ID of having prepared community in described Pre-handoff instruction.
Beneficial effect of the present invention is:
1, mobile terminal calculates RSRP variable gradient value according to the Reference Signal Received Power of all adjacent base stations of test constantly (RSRP), then the respective cell, two base stations of RSRP variable gradient value maximum is defined as to the first target of prediction community and the second target of prediction community.In prior art, in the selection of target of prediction community, signal quality is compared as selection foundation, the present invention is more accurate on the target of prediction community of selecting UE to move into, especially for the user who moves in cell edge, can improve the target of prediction community probability identical with Target cell, reduce unnecessary resource reservation operation, and then improve the availability of frequency spectrum.Meanwhile, also improved mobile-terminal RRC reconstruction success rate.
2, after serving BS is prepared the Pre-handoff beamhouse operation of Event triggered and target of prediction community based on Pre-handoff, by switching command, inform that UE has prepared community.With respect to not being to need extra signaling to inform that UE has prepared community and compared based on handover measurement Event triggered owing to switching beamhouse operation in prior art, by switching command, inform that UE has prepared community, can reduce unnecessary network signaling overhead, optimize hand off signaling flow process.
3, the adjacency of mobile terminal based on preparing cell base station and mobile route according to priority sorts the community of preparation of preparing in cell list Prepared-cell_list.With respect to the suitable Target cell that is applicable to reconstruction RRC connection in prior art in inquiry has been prepared cell list, compare, the present invention's efficiency in query script is higher, has shortened break period.
4, mobile terminal is based on switching execution event premature termination T310 timer, and with respect to using the T310 timer shortening to compare in prior art, the present invention is more reasonable in the selection of T310 timer duration.Because UE is when the A3 Event triggered, sent MR measurement report to source base station.Therefore, it can guarantee that Target cell has been ready to UE context and the selected community of having prepared of UE is a suitable community simultaneously, has improved reconstruction success rate, and has shortened break period.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearer, the invention provides following accompanying drawing and describe:
Fig. 1 is the flow chart that RLF provided by the invention recovers Enhancement Method the first embodiment;
Fig. 2 is provided by the invention completing when the n time RSRP of neighbor cell measured, and obtains and record the RSRP Grad Gradient of the n-1 time to the n time measurement of described all adjacent cells n-1, n(n=2,3,4 ...) the flow chart of the first embodiment of method;
Fig. 3 for the embodiment of the present invention provide when Target cell predicted events meets, obtain the flow chart of the first embodiment of method of the cell ID of maximum RSRP gradient community and time large RSRP gradient community;
Fig. 4 be that the embodiment of the present invention provides according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, determine the flow chart of the first embodiment of method of the cell ID of the first target of prediction community and the second target of prediction community;
Fig. 5 is the translational speed current according to described mobile terminal that the embodiment of the present invention provides, and obtains the flow chart of the first embodiment that Pre-handoff is prepared the method for trigger event EarlyPreparEvent;
Fig. 6 obtains the priority of preparing community, generates the flow chart of the first embodiment of the method for having prepared cell list Prepared-cell_list;
Fig. 7 is the translational speed current according to mobile terminal, obtains the flow chart of the first embodiment of the method for switching execution event ExeEvent;
Fig. 8 is the flow chart that in the embodiment of the present invention, RLF recovers Enhancement Method the second embodiment;
Fig. 9 is motion path and the cell deployment schematic diagram of mobile terminal in this application scene;
Figure 10 is the RSRP gradient analysis schematic diagram of adjacent base station in this application scene;
Figure 11 is hand off signaling flow chart in the embodiment of the present invention;
Figure 12 is the delay Analysis schematic diagram that in the embodiment of the present invention, wireless link inefficacy RLF recovers;
The schematic diagram of the mobile terminal that Figure 13 provides for the embodiment of the present invention;
The schematic diagram of the base station that Figure 14 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 is the flow chart of RLF quick recovery method the first embodiment provided by the invention.In the present embodiment, mobile terminal is positioned at wireless link inefficacy RLF hotspots.Described wireless link inefficacy RLF hotspots provides radio communication service by a macrocell macrocell and several Microcells picocell.The present access subzone of described mobile terminal is a Microcell picocell under macrocellular covers.
The process that mobile terminal is applied RLF recovery Enhancement Method in motion process specifically can comprise:
The Current Serving BTS of steps A 1, mobile terminal continues to obtain the measurement of described mobile terminal to the signal quality of this base station, and whether analyze described mobile terminal needs to start to carry out the handover measurement to adjacent base station.If desired, execution step A2.If do not need, continue execution step A1.
Steps A 2, mobile terminal continue to obtain the measured value to the RSRP of all adjacent base stations.
Concrete, mobile terminal can continue to obtain the measured value to the RSRP of all adjacent base stations.Described all adjacent base stations comprise near adjacent microcell base station PeNB service Microcell and the macro cell base station MeNB that covers service Microcell.
Steps A 3, completing when the n time RSRP of adjacent base station measured, obtain and record the RSRP Grad Gradient of the n-1 time to the n time measurement of described all adjacent base stations n-1, n(n=2,3,4 ...).
Concrete, mobile terminal can, completing when the n time RSRP of adjacent base station measured, obtain and record the RSRP Grad Gradient of the n-1 time to the n time measurement of described all adjacent base stations n-1, n(n=2,3,4 ...).Wherein, respective cell sign ID and the RSRP variable gradient value Gradient_ID thereof of all adjacent base stations will be recorded n-1, n(n=2,3,4 ...) information table be defined as RSRP gradient table.
Steps A 4, according to the signal quality of the current service cell of mobile terminal, judge whether to have started target of prediction community.If of course, execution step A5.If cannot, execution step A2.
Concrete, mobile terminal can, according to the signal quality of the current service cell of mobile terminal, judge whether to have started target of prediction community.If of course, execution step A5.If cannot, continue execution step A2.
Steps A 5, when described Target cell predicted events meets, obtain the cell ID of maximum RSRP gradient community and time large RSRP gradient community.
Concrete, mobile terminal can be when described Target cell predicted events meets, and inquiry RSRP gradient table obtains the cell ID of maximum RSRP gradient community and time large RSRP gradient community.Wherein, the cell ID of maximum RSRP gradient community refers to, and in all records, RSRP Grad is the maximum maximum cell ID of number of times.The cell ID of inferior large RSRP gradient community refers to, and in all records, RSRP Grad is time large maximum cell ID of number of times.
Steps A 6, according to the cell ID of maximum RSRP gradient community and inferior large RSRP gradient community, determine the cell ID of the first target of prediction community and the second target of prediction community.
Concrete, mobile terminal can, according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, be determined the cell ID of the first target of prediction community and the second target of prediction community.Wherein, the cell ID of maximum RSRP gradient community is defined as to the cell ID of the first target of prediction community, the cell ID of inferior large RSRP gradient community is defined as to the cell ID of the second target of prediction community.
Steps A 7, obtain the current translational speed of described mobile terminal.
Concrete, mobile terminal can obtain current translational speed when motion, and translational speed can be obtained by the high-speed mobile vehicles at described mobile terminal place, then sends to mobile terminal.
Steps A 8, the translational speed current according to described mobile terminal, obtain Pre-handoff and prepare trigger event EarlyPreparEvent.
Concrete, the translational speed that mobile terminal can be current according to described mobile terminal, obtains Pre-handoff and prepares trigger event EarlyPreparEvent.Wherein, mobile terminal can be inquired about v-EarlyPreparEvent mapping table and obtain the Pre-handoff preparation trigger event mating with current translational speed.
Wherein the exemplary configurations of v-EarlyPreparEvent mapping table is as shown in table 1:
Table 1.v-EarlyPreparEvent mapping table
V EarlyPreparEvent(A3eventwithTTT=0ms)
Low speed 2dB
Middling speed 1.5dB
At a high speed -1dB
Steps A 9, when described Pre-handoff is prepared trigger event EarlyPreparEvent and is met, described mobile terminal sends Pre-handoff and prepares indication Early_HO_Prepar_IND to base station, current service cell, described mentioning switched the cell ID of preparing to carry in indication the first target of prediction community and the second target of prediction community, so that Pre-handoff beamhouse operation is carried out according to cell ID and the target of prediction community of described the first target of prediction community and the second target of prediction community in base station, current service cell.
Concrete, mobile terminal can be when described Pre-handoff preparation trigger event EarlyPreparEvent meets, described mobile terminal sends Pre-handoff and prepares indication Early_HO_Prepar_IND to base station, current service cell, described mentioning switched the cell ID of preparing to carry in indication the first target of prediction community and the second target of prediction community, so that Pre-handoff beamhouse operation is carried out according to cell ID and the target of prediction community of described the first target of prediction community and the second target of prediction community in base station, current service cell.
Steps A 10, reception Pre-handoff instruction Early_HO_CMD, carry the ready cell ID of having prepared community in described Pre-handoff instruction.
Concrete, mobile terminal can receive Pre-handoff instruction Early_HO_CMD, carries the ready cell ID of having prepared community in described Pre-handoff instruction.Wherein, mobile terminal, after receiving Early_HO_CMD, is not carried out and is switched at once, but continues to measure wireless signal environment, when to be switched execution event meets, a best opportunity, selects a best cell to switch.
Steps A 11, obtain the priority of preparing community, generate and back up and prepared cell list Prepared-cell_list.
Concrete, mobile terminal can obtain the priority of having prepared community, generates and back up to have prepared cell list Prepared-cell_list.So that mobile terminal, after RLF, can be inquired about the community that is applicable to RRC connection reconstruction in Prepared-cell_list successively according to priority, improve suitable cell efficiency of selection, shorten break period.Wherein, the priority of having prepared community is definite according to the adjacency of having prepared target cell base station and mobile route.Adjacency is higher, and priority is higher.
Steps A 12, the translational speed current according to described mobile terminal, obtain and switch execution event ExeEvent.
Concrete, the translational speed that mobile terminal can be current according to described mobile terminal, obtains and switches execution event ExeEvent.Wherein, mobile terminal can be inquired about v-ExeEvent mapping table, obtains the switching of mating with current translational speed and carries out event ExeEvent.
Wherein the exemplary configurations of v-ExeEvent mapping table is as shown in table 2:
Table 2.v-ExeEvent mapping table
V ExeEvent(A3eventwithTTT=0ms)
Low speed 2.5dB
Middling speed 2.5dB
At a high speed 2dB
Steps A 13, when switching execution event ExeEvent and meet, based on ExeEvent premature termination T310 timer and state RLF.
Concrete, mobile terminal can be when switching execution event ExeEvent and meeting, based on ExeEvent premature termination T310 timer and state RLF.Wherein, the embodiment of the present invention is that the recovery of RLF is strengthened and discussed, therefore the situation that T310 has started timing when switching execution event ExeEvent meets is only discussed.The situation that T310 when switching execution event ExeEvent and meet is not started to timing is discussed.
Steps A 14, mobile terminal can be when the cell ID of Target cell that meets ExeEvent be identical with the cell ID of having prepared community in Prepared-cell_list, and selecting has the Target cell of like-identified to carry out RRC connection reconstruction in Prepared-cell_list.
Steps A 15, mobile terminal, when the cell ID of Target cell that meets ExeEvent is different from the cell ID of having prepared community in Prepared-cell_list, are carried out RRC connection reconstruction to Prepared-cell_list Zhong community according to the suitable community of priority sequential search from high to low.
Fig. 2, for completing when the n time RSRP of neighbor cell measured, obtains and records the RSRP Grad Gradient of the n-1 time to the n time measurement of described all adjacent cells n-1, n(n=2,3,4 ...) the flow chart of the first embodiment of method.In the present embodiment, mobile terminal, completing when the n time RSRP of neighbor cell measured, obtains and records the RSRP Grad Gradient of the n-1 time to the n time measurement of described all adjacent cells n-1, n(n=2,3,4 ...) step (steps A 3) specifically comprise:
Step B1, mobile terminal complete when the n time RSRP of adjacent base station measured, and obtain the described mobile terminal the n-1 time RSRP measured value to described all adjacent base stations, wherein, n=2,3,4 ...
Step B2, obtain the described mobile terminal the n time RSRP measured value to described all adjacent base stations.
Step B3, according to described the n-1 time measured value, described the n time measured value and RSRP, measure the RSRP Grad Gradient that interval of delta t calculates respectively all adjacent base stations n-1, n(n=2,3,4 ...).
Wherein, Gradient n-1, ncomputing formula be:
Grad ient n - 1 , n = RS RP n - RSRP n - 1 Δt , n = 2,3,4 , . . . . . .
Step B4, by the respective cell sign ID and the RSRP variable gradient value Gradient thereof that comprise all adjacent base stations n-1, n(n=2,3,4 ...) information table be defined as RSRP gradient table.
Wherein, the exemplary configurations of RSRP gradient table is as shown in table 3:
Table 3.RSRP gradient table
Figure BDA0000469590450000102
step B5, by the RSRP Grad Gradient of all adjacent base stations n-1, n(n=2,3,4 ...) be recorded in RSRP gradient table.
Fig. 3 is provided by the invention when described Target cell predicted events meets, and obtains maximum RSRP gradient community and the inferior flow chart of the first embodiment of the method for the cell ID of RSRP gradient community greatly.In embodiments of the present invention, mobile terminal is when described Target cell predicted events meets, and the step (steps A 5) of obtaining the cell ID of maximum RSRP gradient community and time large RSRP gradient community can also comprise:
Step C1, inquiry RSRP gradient table, obtain the cell ID ID1 of two Grad respective cell maximum in the RSRP Grad of each record n-1, n, ID2 n-1, n(n=2,3,4 ...).
Concrete, mobile terminal can be inquired about RSRP gradient table, obtains the cell ID ID1 of two Grad respective cell maximum in the RSRP Grad of each record n-1, n, ID2 n-1, n(n=2,3,4 ...).Wherein, ID1 n-1, n(n=2,3,4 ...) be to measure the cell ID of respective cell, maximum base station in the RSRP Grad calculating afterwards, ID2 the n time n-1, n(n=2,3,4 ...) be to measure the cell ID of respective cell, second largest value base station in the RSRP Grad calculating afterwards the n time,
Step C2, inquire about all ID1 n-1, n(n=2,3,4 ...), filter out the cell ID ID1 that occurrence number is maximum, ID1 is defined as to the cell ID of maximum RSRP gradient community.
Concrete, mobile terminal can be inquired about all ID1 n-1, n(n=2,3,4 ...), filter out the cell ID ID1 that occurrence number is maximum, ID1 is defined as to the cell ID of maximum RSRP gradient community.
Step C3, inquire about all ID2 n-1, n(n=2,3,4 ...), filter out the cell ID ID2 that occurrence number is maximum, ID2 is defined as to time cell ID of large RSRP gradient community.
Concrete, mobile terminal can be inquired about all ID2 n-1, n(n=2,3,4 ...), filter out the cell ID ID2 that occurrence number is maximum, ID2 is defined as to time cell ID of large RSRP gradient community.
In embodiments of the present invention, mobile terminal is used filter method by a plurality of RSRP Grad of all adjacent base stations, the wrong RSRP Grad that elimination is caused by unsettled wireless environment factor, finally obtains RSRP greatest gradient community and RSRP large gradient community more accurately.Improve the target of prediction community probability identical with Target cell, reduce unnecessary resource reservation operation, and then improve the availability of frequency spectrum.Meanwhile, improved RLF RRC reconstruction success rate afterwards.
Fig. 4 be that the embodiment of the present invention provides according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, determine the flow chart of the first embodiment of method of the cell ID of the first target of prediction community and the second target of prediction community.In embodiments of the present invention, mobile terminal, according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, determines that the step (steps A 6) of the cell ID of the first target of prediction community and the second target of prediction community can also comprise:
Step D1, the cell ID of maximum RSRP gradient community is defined as to the cell ID of the first target of prediction community.
Concrete, mobile terminal can be defined as the cell ID of maximum RSRP gradient community the cell ID of the first target of prediction community.
Step D2, the cell ID of inferior large RSRP gradient community is defined as to the cell ID of the second target of prediction community.
Fig. 5 is the translational speed current according to described mobile terminal provided by the invention, obtains the flow chart of the first embodiment that Pre-handoff is prepared the method for trigger event EarlyPreparEvent.In embodiments of the present invention, the translational speed that mobile terminal is current according to described mobile terminal, the step (steps A 8) of obtaining Pre-handoff preparation trigger event EarlyPreparEvent can also comprise:
Step e 1, obtain the current translational speed of described mobile terminal.
Concrete, mobile terminal can obtain the current translational speed of described mobile terminal.
Step e 2, inquiry movement speed v-EarlyPreparEvent mapping table, obtain corresponding EarlyPreparEvent according to the translational speed of described mobile terminal.
Concrete, mobile terminal can be inquired about movement speed v-EarlyPreparEvent mapping table (in Table 1), according to the translational speed of described mobile terminal, obtains corresponding EarlyPreparEvent.
In embodiments of the present invention, at inquiry movement speed v-EarlyPreparEvent mapping table, before obtaining corresponding EarlyPreparEvent according to the translational speed of described mobile terminal, above-mentioned RLF recovers Enhancement Method embodiment and also comprises:
Described EarlyPreparEvent is set to the A3 event (TTT=0ms) that offset value is less.
In embodiments of the present invention, the Pre-handoff that acquisition for mobile terminal mates with current translational speed is prepared trigger event EarlyPreparEvent, with respect to single Pre-handoff, prepare trigger event, it is more accurate that the Pre-handoff that the embodiment of the present invention obtains is prepared trigger event, further improves handover success rate.
Fig. 6 is the priority of preparing community of obtaining provided by the invention, generates the flow chart of the first embodiment of the method for having prepared cell list Prepared-cell_list.In embodiments of the present invention, acquisition for mobile terminal has been prepared the priority of community, and the step (steps A 11) that cell list Prepared-cell_list has been prepared in generation can also comprise:
Step F 1, inquiry RSRP gradient table, prepared the up-to-date RSRP Grad of community described in obtaining.
Concrete, mobile terminal can be inquired about RSRP gradient table (in Table 3), has prepared the up-to-date RSRP Grad of community described in obtaining.
Step F 2, the priority of preparing community of up-to-date RSRP Grad maximum is defined as to 1.
Concrete, mobile terminal can be defined as 1 by the priority of preparing community of up-to-date RSRP Grad maximum.
Step F 3, the up-to-date RSRP Grad time large priority of preparing community is defined as to 2.
Concrete, mobile terminal can be defined as 2 by the up-to-date RSRP Grad time large priority of preparing community.
Step F 4, according to described cell ID and the priority of having prepared community, generate and back up and prepared cell list Prepared-cell_list.
Concrete, mobile terminal can, according to described cell ID and the priority of having prepared community, generate and back up and prepare cell list Prepared-cell_list.
In embodiments of the present invention, mobile terminal obtains the adjacency of itself and mobile terminal mobile route according to the RSRP Grad of having prepared cell base station, thereby to the community of preparing that adjacency is high, give high priority, finally according to priority, to preparing cell list Prepared-cell_list, sort.When mobile terminal can be inquired about in turn after RLF in preparing cell list, find as early as possible and be applicable to the suitable cell that RRC rebuilds.Shorten the system break time, improved telecommunication service quality.
Fig. 7 is the translational speed current according to described mobile terminal provided by the invention, obtains the flow chart of the first embodiment of the method for switching execution event ExeEvent.In embodiments of the present invention, the translational speed that mobile terminal is current according to described mobile terminal, the step (steps A 12) of obtaining switching execution event ExeEvent can also comprise:
Step G1, obtain the current translational speed of described mobile terminal.
Concrete, mobile terminal can obtain current translational speed.
Step G2, inquiry movement speed v-ExeEvent mapping table, obtain corresponding ExeEvent according to the translational speed of described mobile terminal.
Concrete, mobile terminal can be inquired about movement speed v-ExeEvent mapping table (in Table 2), according to the translational speed of described mobile terminal, obtains corresponding ExeEvent.
In embodiments of the present invention, at inquiry movement speed v-ExeEvent mapping table, before obtaining corresponding ExeEvent according to the translational speed of described mobile terminal, above-mentioned RLF recovers Enhancement Method embodiment and also comprises: the A3 event (TTT=0ms) that offset value is larger is defined as switching execution event ExeEvent;
In embodiments of the present invention, mobile terminal is according to current translational speed, and obtain the switching matching and carry out event ExeEvent, and using the larger A3 event of offset value as ExeEvent.So that the T310 based on switching execution event shifts to an earlier date premature termination, can guarantee that Target cell has been ready to UE context, can guarantee again to have prepared community is a suitable community.
Fig. 8 is the flow chart that in the embodiment of the present invention, RLF recovers Enhancement Method the second embodiment.In embodiments of the present invention, the method that execution RLF in base station recovers to strengthen comprises:
Step H1, reception Pre-handoff are prepared indication Early_HO_Prepar_IND, and described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community.
Concrete, base station can receive Pre-handoff and prepare indication Early_HO_Prepar_IND, and described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community.
Step H2, according to the cell ID of described the first target of prediction community and the second target of prediction community, to described the first target of prediction community and the second target of prediction community, send Pre-handoff preparation request signaling Early_HO_Prepar_Request, obtain the channel resource of the first target of prediction community and the second target of prediction community.
Step H3, receiving while preparing to confirm signaling from the Pre-handoff of target of prediction community, described Pre-handoff is prepared to confirm that the cell ID carrying in signaling Early_HO_Prepar_ACK is defined as preparing the cell ID of community.
Concrete, base station can, receiving while preparing to confirm signaling from the Pre-handoff of target of prediction community, prepare to confirm that by described Pre-handoff the cell ID carrying in signaling Early_HO_Prepar_ACK is defined as preparing the cell ID of community.
Step H4, to described mobile terminal, send switching command HO_CMD, in described switching command, carry the cell ID of preparing community.
Concrete, base station can send switching command HO_CMD to described mobile terminal, carries the cell ID of preparing community in described switching command.
In embodiments of the present invention, base station is the equal request channel resource in the first target of prediction community and the second target of prediction community.Can be after based on switching execution event ExeEvent premature termination T310 timer, when identical with off-the-shelf the first target of prediction community or the second target of prediction community in Target cell, make mobile terminal rebuild RRC with off-the-shelf the first target of prediction community or the second target of prediction community fast and be connected.Improved reconstruction success rate, shortened the system break time, improved telecommunication service quality.
For the more detailed description embodiment of the present invention, provide concrete application scenarios of the present invention below.
Fig. 9 is motion path and the cell deployment schematic diagram of mobile terminal in this application scene.Wherein, M and M ' are respectively the position that Target cell predicted of mobile terminal in track 1 and track 2 scenes.There are Microcell PCellA, Microcell PCellB and Microcell PCellC in the community that covers track 1 and track 2.PCellA is the current Serving cell of mobile terminal.In this application scene, mobile terminal can be the mobile device on rapid.
As shown in Figure 9, when mobile terminal moves along track 1, mobile Target cell of interrupting being about to enter may be PCell B or PCellC.According to track 1 and the position relationship of PeNBB, PeNBC, can draw, PeNBB is greater than PeNBC to the adjacency of track 1 to the adjacency of track 1.Here the adjacency of indication, refers to PeNB to the distance of motion track.The embodiment of the present invention proposes, and utilizes the RSRP Grad of the adjacent PeNB that mobile terminal measures to indicate the adjacency of adjacent PeNB and motion track.When the RSRP of certain adjacent PeNB Grad is larger, represent this PeNB from the motion track of mobile terminal more close to.And when the RSRP Grad of certain adjacent PeNB is timing, represent this PeNB the place ahead in mobile terminal, otherwise, the rear of this PeNB in mobile terminal represented.Therefore, the embodiment of the present invention is defined as the first target of prediction community by PCellB, and PCellC is defined as to the second target of prediction community., preparing in cell list, the priority of PCellB is greater than the priority of PCellC meanwhile.
In like manner can obtain, when mobile terminal moves along track 2, mobile Target cell of interrupting being about to enter may be PCellB or PCellC.According to track 2 and the position relationship of PeNBB, PeNBC, can draw, the adjacency of PeNBC is greater than PeNBB, and the first target of prediction community is PCellC, and the second target of prediction community is PCellB.Preparing in cell list, the priority of PCellC is greater than the priority of PCellB.
For ease of describing in detail, how to utilize the RSRP Grad of the adjacent PeNB that mobile terminal measures to indicate the adjacency of adjacent PeNB and motion track.Provide the RSRP gradient analysis of adjacent base station below.
Figure 10 is the RSRP gradient analysis schematic diagram of adjacent base station in this application scene.Wherein, mobile terminal carries out the n-1 time RSRP to be measured at an A place, carries out the n time RSRP measurement when moving to a some B.In figure, the Current Serving BTS that PeNB#0 is mobile terminal, micro-base station PeNB#1, micro-base station PeNB#2 be the right front in UE and left front respectively.The direction vector that an A of take is terminal as starting point #1, #2 is respectively two vectorial moulds are respectively L1, L2.The direction vector that a B of take is terminal as starting point #1, #2 is respectively
Figure BDA0000469590450000142
two vectorial moulds are respectively L1', L2'.θ 1, θ 2be respectively
Figure BDA0000469590450000143
with
Figure BDA0000469590450000144
angle.As shown in the figure, the more close PeNB#1 of the motion track of mobile terminal, has
L1＜L2
ΔL1>ΔL2
Wherein,
ΔL1＝L1-L1'
ΔL2＝L2-L2'
The n-1 time RSRP measured value can be expressed as to the variable gradient value of the n time RSRP measured value:
Grad ient n - 1 , n = RS RP n - RSRP n - 1 Δt
If Gradient n-1, n_ 1, Gradient n-1, n_ 2 correspond respectively to the RSRP Grad of micro-base station PeNB#1 and micro-base station PeNB#2, have
Gra dient n - 1 , n _ 1 = RSRP n _ 1 - RSRP n - 1 _ 1 Δt
Gra dient n - 1 , n _ 2 = RSRP n _ 2 - RSRP n - 1 _ 2 Δt
Wherein, RSRP i_ j represents the RSRP value of micro-base station PeNB#j that mobile terminal obtains in the i time is measured, and Δ t represents that the n-1 time measurement is poor with the Measuring Time of the n time measurement.
Reference Signal Received Power RSRP(ReferenceSignalReceivePower) be the reference signal transmitted power RSTP(ReferenceSignalTransmissionPower of adjacent base station) through wireless environment channel loss, obtain.Channel loss under wireless environment mainly contains rapid fading, path loss, penetration loss, shadow fading etc., and channel loss and mobile terminal become non-linear direct ratio to the distance of base station.If the channel loss under wireless channel environment is LS(R), R is that mobile terminal is to the distance of base station.The RSRP Grad of micro-base station PeNB#1 and micro-base station PeNB#2 can be expressed as,
Gradie nt n - 1 , n _ 1 = [ PSTP - LS ( L 1 ′ ) ] - [ RSTP - LS ( L 1 ) ] Δt = LS ( L 1 ) - LS ( L 1 ′ ) Δt = LS ( L 1 ) - LS ( L 1 - ΔL 1 ) Δt
Gradie nt n - 1 , n _ 2 = [ PSTP - LS ( L 2 ′ ) ] - [ RSTP - LS ( L 2 ) ] Δt = LS ( L 2 ) - LS ( L 2 ′ ) Δt = LS ( L 2 ) - LS ( L 2 - ΔL 2 ) Δt
Obviously, according to above formula, can obtain,
Gradient n-1,n_1＞Gradient n-1,n_2
By above analysis, draw to draw a conclusion:
(1), when adjacent base station is positioned at the place ahead of mobile terminal, the RSRP Grad of this base station is for just; Otherwise when adjacent base station is positioned at the rear of mobile terminal, the RSRP Grad of this base station is for negative;
(2) when adjacent base station is positioned at the place ahead of UE, the adjacency of the mobile route of adjacent base station and mobile terminal is higher, and the RSRP Grad of this base station is larger; Otherwise the adjacency of the mobile route of adjacent base station and mobile terminal is lower, the RSRP Grad of this base station is less.
Therefore, mobile terminal can utilize the RSRP Grad of the adjacent base station measuring to indicate the mobile route adjacency of this neighbour base station and mobile terminal.
The hand off signaling flow process of recovering Enhancement Method and system in order to illustrate in greater detail whole RLF, refers to Figure 11.Figure 11 is hand off signaling flow chart in the embodiment of the present invention.
In order to illustrate in greater detail RLF, recover Enhancement Method to the RLF recovery optimization of break period, refer to Figure 12, Figure 12 is the delay Analysis schematic diagram that in the embodiment of the present invention, wireless link inefficacy RLF recovers.In embodiments of the present invention, the time delay based on switching the T310 timer of carrying out Event triggered is far smaller than traditional 1000ms, and the generation of having prepared cell list has also been saved last 100ms time delay.Therefore, the embodiment of the present invention has shortened the system break time that RLF recovery brings greatly.
The embodiment of the present invention also provides corresponding mobile terminal embodiment, and referring to Figure 13, Figure 13 is the schematic diagram of the mobile terminal that provides of the embodiment of the present invention.
In embodiments of the present invention, mobile terminal comprises:
RSRP memory cell 101, for continuing to obtain the measured value to the RSRP of all adjacent base stations;
RSRP gradient memory cell 102, for calculating RSRP Grad, and stores RSRP gradient table;
The first acquiring unit 103, for obtaining the cell ID of maximum RSRP gradient community and time large RSRP gradient community;
The first determining unit 104, for determining the cell ID of the first target of prediction community and the second target of prediction community;
Second acquisition unit 105, for obtaining the current translational speed of described mobile terminal;
The 3rd acquiring unit 106, for the translational speed current according to described mobile terminal, obtains Pre-handoff and prepares trigger event EarlyPreparEvent;
Early_HO_Prepar_IND transmitting element 107, be used for sending Pre-handoff and prepare indication, described mentioning switched the cell ID of preparing to carry in indication the first target of prediction community and the second target of prediction community, so that Pre-handoff beamhouse operation is carried out according to cell ID and the target of prediction community of described the first target of prediction community and the second target of prediction community in base station, current service cell;
Early_HO_CMD receiving element 108, for receiving Pre-handoff instruction Early_HO_CMD, carries the ready cell ID of having prepared community in described Pre-handoff instruction;
Prepare cell information memory cell 109, for generating and backing up, prepared cell list Prepared-cell_list;
The 4th acquiring unit 110, for the translational speed current according to described mobile terminal, obtains and switches execution event ExeEvent;
T310 premature termination trigger element 111, for when switching execution event ExeEvent and meet, based on ExeEvent premature termination T310 timer and state RLF;
The RLF that the mobile terminal that the embodiment of the present invention provides can be used in aforementioned correspondence recovers in Enhancement Method the first embodiment.
The embodiment of the present invention also provides corresponding base station embodiment, and referring to Figure 14, Figure 14 is the schematic diagram of the base station that provides of the embodiment of the present invention.
In embodiments of the present invention, base station comprises:
Early_HO_Prepar_IND receiving element 201, prepares indication for receiving Pre-handoff, described in mention and switch the cell ID of preparing to carry in indication the first target of prediction community and the second target of prediction community;
Pre-handoff is prepared performance element 202, for according to the cell ID of the cell ID of described the first target of prediction community and the second target of prediction community, carries out Pre-handoff beamhouse operation with described the first target of prediction community and the second target of prediction community;
Early_HO_Prepar_Request transmitting element 203, for sending Pre-handoff preparation request signaling;
Early_HO_Prepar_ACK receiving element 204, confirms signaling for receiving Pre-handoff preparation request;
Early_HO_CMD transmitting element 205, for sending Pre-handoff instruction Early_HO_CMD, carries the ready cell ID of having prepared community in described Pre-handoff instruction;
The RLF that base station provided by the invention can be used in aforementioned correspondence recovers in Enhancement Method the second embodiment.
It should be noted that, the concrete implementation of each unit in said apparatus and the inventive method embodiment are based on same design, and particular content can, referring to narrating in the inventive method embodiment, repeat no more herein.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the hardware that instruction is relevant to complete by program, this program can be stored in a computer-readable recording medium, and storage medium can comprise: read-only memory, random asccess memory, disk or CD etc.
Finally explanation is, above preferred embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can to it, make various changes in the form and details, and not depart from the claims in the present invention book limited range.

Claims (10)

1. the Radio Link Failure of selecting based on optimal reconstruction Target cell recovers an Enhancement Method, it is characterized in that: comprise the following steps:
1) Current Serving BTS of mobile terminal continues to obtain the measurement of mobile terminal to the signal quality of this base station, and whether need start carry out handover measurement to adjacent base station, if desired, carry out 2 if analyzing described mobile terminal) step; If do not need, continue to carry out 1) step;
2) mobile terminal continues to obtain the measured value to the RSRP of all adjacent base stations;
3) completing when the n time RSRP of adjacent base station measured, obtain and record the RSRP Grad Gradient of the n-1 time to the n time measurement of all adjacent base stations n-1, n(n=2,3,4 ...);
4) according to the signal quality of the Current Serving BTS of mobile terminal, judge whether to have started target of prediction community, if can, carry out 5) step; If cannot, carry out 2) step;
5), when described Target cell predicted events meets, obtain the cell ID of maximum RSRP gradient community and time large RSRP gradient community;
6), according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, determine the cell ID of the first target of prediction community and the second target of prediction community;
7) obtain the current translational speed of described mobile terminal;
8) translational speed current according to described mobile terminal, obtains Pre-handoff and prepares trigger event EarlyPreparEvent;
9) when Pre-handoff preparation trigger event EarlyPreparEvent meets, mobile terminal sends Pre-handoff and prepares indication Early_HO_Prepar_IND to base station, current service cell, described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community, so that Pre-handoff beamhouse operation is carried out according to the cell ID of the first target of prediction community and the second target of prediction community and target of prediction community in base station, current service cell;
10) receive Pre-handoff instruction Early_HO_CMD, in described Pre-handoff instruction, carry the ready cell ID of having prepared community;
11) obtain the priority of preparing community, generate and back up and prepared cell list Prepared-cell_list;
12) translational speed current according to described mobile terminal, obtains and switches execution event ExeEvent;
13) when switching execution event ExeEvent and meet, based on ExeEvent premature termination T310 timer and state RLF;
14), when the cell ID of Target cell that meets ExeEvent is identical with the cell ID of having prepared community in Prepared-cell_list, selecting has the Target cell of like-identified to carry out RRC connection reconstruction in Prepared-cell_list;
15) when the cell ID of Target cell that meets ExeEvent is different from the cell ID of having prepared community in Prepared-cell_list, RRC connection reconstruction is carried out to according to the suitable community of priority sequential search from high to low in Prepared-cell_list Zhong community.
2. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: described mobile terminal continues to obtain the measured value to the RSRP of all adjacent base stations, specifically comprises: described mobile terminal is positioned at wireless link inefficacy RLF hotspots; Described wireless link inefficacy RLF hotspots provides radio communication service by a macrocell macrocell and several Microcells picocell; The current access base station of described mobile terminal is a microcell base station PeNB under macrocellular covers; Described adjacent base station can be the macro cell base station MeNB that covers service Microcell, can be also adjacent microcell base station PeNB.
3. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: in step 3), complete when the n time RSRP of adjacent base station measured, obtain and record the RSRP Grad of measuring for the n-1 time to the n time of all adjacent base stations, specifically comprise: complete when the n time RSRP of adjacent base station measured, obtain the described mobile terminal the n-1 time RSRP measured value to described all adjacent base stations;
Obtain the described mobile terminal the n time RSRP measured value to described all adjacent base stations;
According to described the n-1 time measured value, described the n time measured value and RSRP, measure the RSRP Grad Gradientn-1 that interval of delta t calculates respectively all adjacent base stations, n(n=2,3,4 ...);
By the respective cell sign ID and the RSRP variable gradient value Gradientn-1 thereof that comprise all adjacent base stations, n(n=2,3,4 ...) information table be defined as RSRP gradient table;
By the RSRP Grad Gradientn-1 of all adjacent base stations, n(n=2,3,4 ...) be recorded in RSRP gradient table.
4. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: in step 5), when described Target cell predicted events meets, the cell ID that obtains maximum RSRP gradient community and time large RSRP gradient community, specifically comprises:
Inquiry RSRP gradient table, obtains the cell ID ID1 of two Grad respective cell maximum in the RSRP Grad of each record n-1, n, ID2 n-1, n;
Inquire about all ID1 n-1, n, filter out the cell ID ID1 that occurrence number is maximum, ID1 is defined as to the cell ID of maximum RSRP gradient community;
Inquire about all ID2 n-1, n, filter out the cell ID ID2 that occurrence number is maximum, ID2 is defined as to time cell ID of large RSRP gradient community.
5. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: in step 6), according to the cell ID of maximum RSRP gradient community and time large RSRP gradient community, the cell ID of determining the first target of prediction community and the second target of prediction community, specifically comprises:
The cell ID of maximum RSRP gradient community is defined as to the cell ID of the first target of prediction community;
The cell ID of inferior large RSRP gradient community is defined as to the cell ID of the second target of prediction community.
6. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: the translational speed current according to described mobile terminal, obtain Pre-handoff and prepare trigger event EarlyPrepar Event, specifically comprise:
Obtain the current translational speed of described mobile terminal;
Inquiry movement speed v-EarlyPreparEvent mapping table, obtains corresponding EarlyPreparEvent according to the translational speed of described mobile terminal;
Described EarlyPreparEvent is set to the A3 event that offset value is less.
7. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: in step 11), obtain the priority of preparing community, generate and back up and prepared cell list Prepared-cell_list, specifically comprise:
Inquiry RSRP gradient table, has prepared the up-to-date RSRP Grad of community described in obtaining;
The priority of preparing community of up-to-date RSRP Grad maximum is defined as to 1;
The up-to-date RSRP Grad time large priority of preparing community is defined as to 2;
According to described cell ID and the priority of having prepared community, generate and back up and prepared cell list Prepared-cell_list.
8. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: the translational speed current according to described mobile terminal, and obtain and switch execution event ExeEvent, specifically comprise:
Obtain the current translational speed of described mobile terminal;
Inquiry movement speed v-ExeEvent mapping table, obtains corresponding ExeEvent according to the translational speed of described mobile terminal;
The larger A3 event of offset value is defined as switching execution event ExeEvent.
9. the Radio Link Failure of selecting based on optimal reconstruction Target cell according to claim 1 recovers Enhancement Method, it is characterized in that: according to the cell ID of described the first target of prediction community and the second target of prediction community, to described the first target of prediction community and the second target of prediction community, send Pre-handoff preparation request signaling Early_HO_Prepar_Request, obtain the channel resource of the first target of prediction community and the second target of prediction community; Receiving while preparing to confirm signaling from the Pre-handoff of target of prediction community, described Pre-handoff is prepared to confirm that the cell ID carrying in signaling Early_HO_Prepar_ACK is defined as preparing the cell ID of community; To described mobile terminal, send switching command HO_CMD, in described switching command, carry the cell ID of preparing community.
10. the Radio Link Failure of selecting based on optimal reconstruction Target cell recovers an intensifier, it is characterized in that: comprise a kind of mobile terminal and a kind of base station;
Mobile terminal comprises:
RSRP memory cell, for continuing to obtain the measured value to the RSRP of all adjacent base stations;
RSRP gradient memory cell, for calculating RSRP Grad, and stores RSRP gradient table;
The first acquiring unit, for obtaining the cell ID of maximum RSRP gradient community and time large RSRP gradient community;
The first determining unit, for determining the cell ID of the first target of prediction community and the second target of prediction community;
Second acquisition unit, for obtaining the current translational speed of described mobile terminal;
The 3rd acquiring unit, for the translational speed current according to described mobile terminal, obtains Pre-handoff and prepares trigger event EarlyPreparEvent;
Early_HO_Prepar_IND transmitting element, be used for sending Pre-handoff and prepare indication, described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community, so that Pre-handoff beamhouse operation is carried out according to cell ID and the target of prediction community of described the first target of prediction community and the second target of prediction community in base station, current service cell;
Early_HO_CMD receiving element, for receiving Pre-handoff instruction Early_HO_CMD, carries the ready cell ID of having prepared community in described Pre-handoff instruction;
Prepare cell information memory cell, for generating and backing up, prepared cell list Prepared-cell_list;
The 4th acquiring unit, for the translational speed current according to described mobile terminal, obtains and switches execution event ExeEvent; T310 premature termination trigger element, for when switching execution event ExeEvent and meet, based on ExeEvent premature termination T310 timer and state RLF;
Base station comprises:
Early_HO_Prepar_IND receiving element, prepares indication for receiving Pre-handoff, and described Pre-handoff prepares to carry in indication the cell ID of the first target of prediction community and the second target of prediction community;
Pre-handoff is prepared performance element, for according to the cell ID of the cell ID of the first target of prediction community and the second target of prediction community, carries out Pre-handoff beamhouse operation with described the first target of prediction community and the second target of prediction community;
Early_HO_Prepar_Request transmitting element, for sending Pre-handoff preparation request signaling;
Early_HO_Prepar_ACK receiving element, confirms signaling for receiving Pre-handoff preparation request;
Early_HO_CMD transmitting element, for sending Pre-handoff instruction Early_HO_CMD, carries the ready cell ID of having prepared community in described Pre-handoff instruction.
CN201410064314.8A 2014-02-25 2014-02-25 Wireless link failure recovery enhancing method and system based on optimal reconstruction target cell selection Active CN103763730B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410064314.8A CN103763730B (en) 2014-02-25 2014-02-25 Wireless link failure recovery enhancing method and system based on optimal reconstruction target cell selection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410064314.8A CN103763730B (en) 2014-02-25 2014-02-25 Wireless link failure recovery enhancing method and system based on optimal reconstruction target cell selection

Publications (2)

Publication Number Publication Date
CN103763730A true CN103763730A (en) 2014-04-30
CN103763730B CN103763730B (en) 2017-01-11

Family

ID=50530875

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410064314.8A Active CN103763730B (en) 2014-02-25 2014-02-25 Wireless link failure recovery enhancing method and system based on optimal reconstruction target cell selection

Country Status (1)

Country Link
CN (1) CN103763730B (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105050141A (en) * 2015-08-13 2015-11-11 京信通信技术(广州)有限公司 Cell handover method and base station thereof
CN105208615A (en) * 2015-06-16 2015-12-30 南京邮电大学 Switching method based on adjustable prediction threshold hysteresis margin in super-dense network
CN105744481A (en) * 2016-03-31 2016-07-06 北京邮电大学 Inter-system mobility management method
CN105992252A (en) * 2015-02-13 2016-10-05 北京三星通信技术研究有限公司 Processing method and apparatus for context of UE
CN106332117A (en) * 2015-06-23 2017-01-11 中兴通讯股份有限公司 Radio link failure (RLF) data-based long term evolution (LTE) network optimization method and device
CN106717049A (en) * 2014-09-23 2017-05-24 高通股份有限公司 Predicting one or more system loss events and proactive system recovery
CN106941701A (en) * 2017-04-18 2017-07-11 宇龙计算机通信科技(深圳)有限公司 The cell switching method and relevant apparatus of terminated cell
CN107959984A (en) * 2018-01-22 2018-04-24 创新维度科技（北京）有限公司 RRC connection reconstructions method, base station and user terminal in Internet of Things
WO2018201503A1 (en) * 2017-05-05 2018-11-08 华为技术有限公司 Measuring method and device
CN108834186A (en) * 2018-06-01 2018-11-16 徐州工业职业技术学院 LTE-R is switched fast algorithm under a kind of high-speed rail environment
WO2019056906A1 (en) * 2017-09-19 2019-03-28 Oppo广东移动通信有限公司 Cell measurement method and device, terminal, and storage medium
CN109640362A (en) * 2017-10-09 2019-04-16 中国移动通信有限公司研究院 A kind of link re-establishment method, apparatus and computer readable storage medium
CN110072244A (en) * 2018-01-24 2019-07-30 电信科学技术研究院有限公司 A kind of control method and equipment of Radio Link Failure timer
CN107249200B (en) * 2017-05-10 2019-10-11 西安交通大学 A kind of switching method using Fuzzy Forecasting Model
CN110831082A (en) * 2018-08-10 2020-02-21 展讯通信（上海）有限公司 Cell switching method, cell switching device, RRC reestablishment method, RRC reestablishment device, storage medium and user equipment
WO2020073171A1 (en) * 2018-10-08 2020-04-16 Qualcomm Incorporated Enhanced radio link recovery in wireless systems
CN111954284A (en) * 2020-08-24 2020-11-17 珠海格力电器股份有限公司 Method and system for accessing mobile terminal to network, communication base station and server
WO2022002016A1 (en) * 2020-06-29 2022-01-06 华为技术有限公司 Neighbor cell measurement method and apparatus therefor
CN114245484A (en) * 2020-09-09 2022-03-25 大唐移动通信设备有限公司 RRC connection recovery processing method and device, electronic equipment and storage medium
WO2022205290A1 (en) * 2021-04-01 2022-10-06 Qualcomm Incorporated Optimized radio link failure recovery for cells reported in measurement report

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060223443A1 (en) * 2005-04-01 2006-10-05 Adaptix, Inc. Systems and methods for coordinating the coverage and capacity of a wireless base station
CN1964574A (en) * 2005-10-13 2007-05-16 三菱电机株式会社 Method for determining if a first cell is neighbour of a second cell
CN101529941A (en) * 2006-10-27 2009-09-09 艾利森电话股份有限公司 Method and apparatus for estimating a position of an access point in a wireless communications network
US20100322227A1 (en) * 2009-06-22 2010-12-23 Qualcomm Incorporated Methods and apparatus for coordination of sending reference signals from multiple cells

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060223443A1 (en) * 2005-04-01 2006-10-05 Adaptix, Inc. Systems and methods for coordinating the coverage and capacity of a wireless base station
CN1964574A (en) * 2005-10-13 2007-05-16 三菱电机株式会社 Method for determining if a first cell is neighbour of a second cell
CN101529941A (en) * 2006-10-27 2009-09-09 艾利森电话股份有限公司 Method and apparatus for estimating a position of an access point in a wireless communications network
US20100322227A1 (en) * 2009-06-22 2010-12-23 Qualcomm Incorporated Methods and apparatus for coordination of sending reference signals from multiple cells

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
毛旭，陈前斌，唐伦: "异构网络垂直切换技术", 《通信技术》 *

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106717049A (en) * 2014-09-23 2017-05-24 高通股份有限公司 Predicting one or more system loss events and proactive system recovery
CN105992252A (en) * 2015-02-13 2016-10-05 北京三星通信技术研究有限公司 Processing method and apparatus for context of UE
CN105992252B (en) * 2015-02-13 2021-07-09 北京三星通信技术研究有限公司 Method and device for processing UE context of User Equipment (UE)
CN105208615B (en) * 2015-06-16 2019-04-16 南京邮电大学 Based on the prediction adjustable switching method of thresholding hysteresis margin in a kind of super-intensive network
CN105208615A (en) * 2015-06-16 2015-12-30 南京邮电大学 Switching method based on adjustable prediction threshold hysteresis margin in super-dense network
CN106332117A (en) * 2015-06-23 2017-01-11 中兴通讯股份有限公司 Radio link failure (RLF) data-based long term evolution (LTE) network optimization method and device
CN105050141A (en) * 2015-08-13 2015-11-11 京信通信技术(广州)有限公司 Cell handover method and base station thereof
CN105050141B (en) * 2015-08-13 2019-01-18 京信通信系统（中国）有限公司 A kind of cell switching method and its base station
CN105744481A (en) * 2016-03-31 2016-07-06 北京邮电大学 Inter-system mobility management method
CN105744481B (en) * 2016-03-31 2019-10-11 北京邮电大学 A kind of motion management method of different systems
CN106941701A (en) * 2017-04-18 2017-07-11 宇龙计算机通信科技(深圳)有限公司 The cell switching method and relevant apparatus of terminated cell
CN106941701B (en) * 2017-04-18 2020-11-10 宇龙计算机通信科技(深圳)有限公司 Cell switching method of terminal cell and related device
WO2018201503A1 (en) * 2017-05-05 2018-11-08 华为技术有限公司 Measuring method and device
US11445395B2 (en) 2017-05-05 2022-09-13 Huawei Technologies Co., Ltd. Measurement method and device
CN107249200B (en) * 2017-05-10 2019-10-11 西安交通大学 A kind of switching method using Fuzzy Forecasting Model
WO2019056906A1 (en) * 2017-09-19 2019-03-28 Oppo广东移动通信有限公司 Cell measurement method and device, terminal, and storage medium
CN109640362A (en) * 2017-10-09 2019-04-16 中国移动通信有限公司研究院 A kind of link re-establishment method, apparatus and computer readable storage medium
CN109640362B (en) * 2017-10-09 2021-05-28 中国移动通信有限公司研究院 Link reconstruction method, device and computer readable storage medium
CN107959984A (en) * 2018-01-22 2018-04-24 创新维度科技（北京）有限公司 RRC connection reconstructions method, base station and user terminal in Internet of Things
CN110072244A (en) * 2018-01-24 2019-07-30 电信科学技术研究院有限公司 A kind of control method and equipment of Radio Link Failure timer
CN110072244B (en) * 2018-01-24 2022-07-29 大唐移动通信设备有限公司 Control method and device of radio link failure timer
CN108834186A (en) * 2018-06-01 2018-11-16 徐州工业职业技术学院 LTE-R is switched fast algorithm under a kind of high-speed rail environment
CN110831082A (en) * 2018-08-10 2020-02-21 展讯通信（上海）有限公司 Cell switching method, cell switching device, RRC reestablishment method, RRC reestablishment device, storage medium and user equipment
CN110831082B (en) * 2018-08-10 2021-08-17 展讯通信（上海）有限公司 Cell switching method, cell switching device, RRC reestablishment method, RRC reestablishment device, storage medium and user equipment
US11490303B2 (en) 2018-08-10 2022-11-01 Spreadtrum Communications (Shanghai) Co., Ltd. Cell handover method and apparatus, RRC reestablishment method and apparatus, storage medium and user equipment
WO2020073171A1 (en) * 2018-10-08 2020-04-16 Qualcomm Incorporated Enhanced radio link recovery in wireless systems
WO2022002016A1 (en) * 2020-06-29 2022-01-06 华为技术有限公司 Neighbor cell measurement method and apparatus therefor
CN111954284A (en) * 2020-08-24 2020-11-17 珠海格力电器股份有限公司 Method and system for accessing mobile terminal to network, communication base station and server
CN114245484A (en) * 2020-09-09 2022-03-25 大唐移动通信设备有限公司 RRC connection recovery processing method and device, electronic equipment and storage medium
CN114245484B (en) * 2020-09-09 2023-06-02 大唐移动通信设备有限公司 Processing method and device for RRC connection recovery, electronic equipment and storage medium
WO2022205290A1 (en) * 2021-04-01 2022-10-06 Qualcomm Incorporated Optimized radio link failure recovery for cells reported in measurement report

Also Published As

Publication number Publication date
CN103763730B (en) 2017-01-11

Similar Documents

Publication Publication Date Title
CN103763730A (en) Wireless link failure recovery enhancing method and device based on optimal reconstruction target cell selection
US11457349B2 (en) Method and apparatus for managing user equipment history information in wireless communication network
CN109151921B (en) Cell measurement configuration method and device
TWI503013B (en) Cell loading-based cell transition
EP2880913B1 (en) Method and arrangement for mobility procedures
JP5916262B2 (en) Handover method in cellular radio communication system
US9191851B2 (en) Cell size and shape estimation in heterogeneous networks
US8107950B2 (en) Inter-RAT/ frequency automatic neighbor relation list management
US9801086B2 (en) Radio communication system, radio terminal, radio station, network apparatus, and information collecting method
US20130178213A1 (en) Handover method, dedicated network user equipment, access network device, and system
CN110710261B (en) Handover processing method, network device, UE, and computer storage medium
CN102740381B (en) Information processing method and device
KR20110119274A (en) Apparatus and method for providing handover support inforamtion in mobile communication system
CN105744481B (en) A kind of motion management method of different systems
CN101986751A (en) Method for radio resource control (RRC) connection re-establishment after switching failure and user equipment (UE)
JP2024501544A (en) Terminal device, network device, and method
EP2750443A1 (en) Radio connection reestablishment method, user equipment and enb
CN103797855A (en) Method and apparatus for handover
CN105025465A (en) User terminal position reporting method, base station, mobile management entity and system
CN116965095A (en) Method for communication, terminal device, network device and computer readable medium
CN104955127A (en) Method for performing cross-system network information interaction, and terminal system network element
Claussen Efficient self-optimization of neighbour cell lists in macrocellular networks
CN103188744B (en) The method of radio communication, subscriber equipment and system
EP3002972A1 (en) Handover processing method, device and system
Kasim A survey mobility management in 5G networks

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant