Specific embodiment
Some vocabulary used in be censuring specific component in this specification and claim, and in artTechnical staff, it is to be appreciated that hardware manufacturer may call same component with different nouns, this specification not withThe difference of title is used as the mode for distinguishing component, but the difference with component functionally is used as the criterion distinguished, logical"comprising"/" the including " of description mentioned in is an open term, therefore should be construed to " include but do not limitIn ".Following preferred embodiments implemented for the present invention.Following examples are only used for the technical characteristic for enumerating the explaination present invention, andNon- that invention is construed as limiting, the scope of the invention is defined by claim.
Schematic flow sheets of the Fig. 1 for the RLF restoration methods of one embodiment of the invention.As shown in figure 1, the RLF recovery sidesMethod includes below scheme：
Step 101, user equipment is after the RLF for betiding current area is detected, if judging to access again described currentWhether cell, the communication quality of the user equipment meet default communication standard；
Step 102, if meeting, from the cell with frequency identical with the current frequency of the user equipment, selects to useAgain the Target cell of wireless network is accessed in the user equipment；If being unsatisfactory for, from the cell with any frequency, selectAgain the Target cell of wireless network is accessed for the user equipment；
Step 103, the user equipment are set up by the Target cell with the selection and are connected, and complete RLF recoveries.
Specifically, when user equipment detects the RLF of current area, RLF Restoration Mechanism, user equipment (User are triggeredEquipment, UE) start to perform cell reselection.In the RLF restoration methods of the embodiment of the present invention, UE starts to perform cell weightWhen selecting, it is first determined the scope of available cell, that is, it is only capable of selecting the current frequency identical cell with UE, or can selectsSelect the cell of any frequency.Wherein, this determines the process of the scope of available cell, is by judging current area by UEWhether communication quality disclosure satisfy that the communication requirement of UE to realize.More specifically, UE can pass through to detect current areaThe related parameter values of signal intensity or signal quality, and the corresponding parametric values by detected value with default communication standard are compared,To perform above-mentioned judgement.Wherein, the relevant parameter of signal intensity or signal quality can be any communication matter of the prior artAmount parameter, is not limited in the present embodiment.A kind of embodiment of the invention, in step 103, the user equipment canBy setting up wireless heterogeneous networks (Radio Resource Control, RRC) connection with the Target cell of the selection, comeRecover into RLF.According to another embodiment of the present invention, in step 103, the user equipment also can by with the selectionTarget cell set up physical layer synchronization (that is, set up physical layer connection), complete RLF recoveries.Default communication standard it is correspondingParameter value can be set according to the communication requirement of UE, and which should be able to meet foundation and be reliably connected, RLF will not occur.
After UE determines the scope of available cell, determined by the range of, using arbitrary cell in prior artSelection criterion, selects the Target cell of wireless network is accessed again for UE.For example, UE enters to each cell in determined scopeRow is investigated, and selects to meet the cell of selection criterion S as follows.Wherein, according to one embodiment of present invention, carrying outBefore cell reselection, according to cell signal quality by being ranked up to weak order to each cell by force, and can sequentially detect which isIt is no to meet criterion S, if meeting, it is resident to the cell, otherwise detects next cell.
Selection criterion S is specially：It is for FDD (Frequency Division Duplexing, FDD) cell, fullSufficient Srxlev>0 and Squal>0；For time division duplex (Time Division Duplexing, TDD) cell, S is metrxlev>0.MoreFor specifically, S can be calculated according to equation belowqualAnd Srxlev：
Squal=Qqualmeas-Qqualmin；
Srxlev=Qrxlevmeas-Qrxlevmin-Pcompensation。
Wherein, QqualmeasThe cell signal quality value for obtaining is measured for UE, refers to the CPICH Common Pilot Channel of FDD cellsThe chip energy of (Common Pilot Channel, CPICH) and the ratio (E of total interfering energyc/N0)。QqualminFor wireless networkLess cell signal quality value (for example, the Q arranged in networkqualminMay be configured as the user equipment and reside at current areaRequired minimum Ec/N0Ratio), if Qqualmeas<Qqualmin, then it is considered that UE departing from the cell service area.Therefore,SqualFor the difference between the less cell signal quality value of the district pilots mass value and network settings of FDD cells, accordinglyGround, Squal>Less cell signal quality value of the district pilots mass value of 0 expression FDD cell better than network settings.
QrxlevmeasThe cell signal strength value for obtaining is measured for UE, for FDD cells, the value refers to connecing for CPICHReceiving number power (Received Signal Code Power, RSCP)；For TDD cell, the value refers to Your Majesty altogetherThe RSCP of control physical channel (Primary Common Control Physical Channel, P-CCPCH).QrxlevminForThe less receiving power of cell arranged in wireless network, the parameter are read from system broadcast message by UE, and general UE is readingAlso need afterwards to do certain arithmetic conversion, be not limited herein, wherein in an embodiment of the present invention, the less receiving power of cellQrxlevminThe user equipment is may be configured as in the wireless network resides at the minimal detectable power needed for current area；PcompensationFor offset, for the difference of the cell received signal performance number for obtaining and cell smaller power value is measured to UECompensate, it is possible to by formula Pcompensation=max (UE_TXPWR_MAX_RACH-P_MAX, 0) obtains, wherein, letterNumber max (X, Y) represents the greater in real number X and Y, and UE_TXPWR_MAX_RACH is UE Stochastic accessings when Stochastic accessing is doneMaximum transmit power on channel (Random Access Channel, RACH), is sent by system broadcast message, and P_MAX is UEMaximum nominal emission power.Therefore, SrxlevRepresent the cell received signal performance number that the UE measurements after compensation are obtainedWith the difference of cell smaller power value, correspondingly, Srxlev>0 represents that the cell received signal power that UE measurements are obtained is better than networkThe receiving power of setting.
For FDD cells, if meeting Srxlev>0 and Squal>0, then it is assumed that the cell meets resident requirement；It is little for TDDArea, as long as meeting Srxlev>0, then it is assumed that the cell meets resident requirement.UE select it is arbitrary meet the resident cell for requiring as withIn the Target cell for accessing again wireless network.
After UE selection target cells, according to existing procedure Stochastic accessing Target cell, and it is attached with Target cell and buildsIt is vertical.After completing connection establishment, work recovery wireless link.
According to the RLF restoration methods of the present embodiment, as UE is detecting RLF, when starting to perform cell reselection, sentence firstIf disconnected UE accesses current area again, whether communication quality meets default communication standard, if meeting, even if knowing that UE gravity treatments are returnedCurrent area, it is also possible to effectively recover wireless link, so selecting the current frequency identical cell with UE, connects again as UEEnter the Target cell of wireless network, to recover rapidly wireless link；If being unsatisfactory for, selected from the cell of any frequencySelect, so that the probability that current area is gone back in UE gravity treatments is greatly reduced, so as to reduce leading to not to have because UE selects current area againEffect recovers the probability of link, improves the success rate and effectiveness of wireless link recovery.
Schematic flow sheets of the Fig. 2 for the RLF restoration methods of another embodiment of the present invention.As shown in Fig. 2 the RLF recoversMethod includes below scheme：
Step 201, UE detect RLF；
Step 202, judges whether to meet the trigger condition for performing cell update；If so, then execution step 203, if it is not, thenExecution step 210；
Step 203, judges for indicating the relevant parameter of the received signal strength of the current area, if meet defaultReceived signal strength standard；If meeting, execution step 204, if being unsatisfactory for, execution step 206；
Step 204, selects the more excellent cell of the current frequency with user equipment, for example, selects on current frequency mostExcellent cell；
Step 205, the cell of the current frequency with user equipment for judging whether to choose suitable；If so, then performStep 209, if it is not, then execution step 208；
Step 206, selects the more excellent cell with any frequency, for example, selects the optimum subdistrict on any frequency；
Step 207, judges whether to choose the suitable cell with any frequency；If so, then execution step 209, ifIt is no, then execution step 208；
Step 208, judges whether recovery intervalometer is overtimeIf it is not, then execution step 206；If so, then execution step 210；
Step 209, sends cell update and waits the cell update that network side is returned to confirm；
Step 210, UE enter idle condition.
Specifically, in above-mentioned steps 203, by judging to be used for the phase of the received signal strength for indicating the current areaRelated parameter, if meet default received signal strength standard, in realizing above-described embodiment one, if judging to access again described working asWhether front cell, the communication quality of UE meet the process of default communication standard.It is following with three kinds of specific received signal strengthsRelevant parameter and accordingly default received signal strength standard, it is illustrative to step 203.
Judgment mode one：
Judge for indicating the relevant parameter of the received signal strength of the current area, if meet and default receive signalStrength criterion, specifically includes：
Judge the receiving power of the current area of UE measurements, if less than default received power threshold, if so, then sentenceSurely it is unsatisfactory for, if it is not, then judging to meet；Wherein, the default received power threshold more than the cell arranged in wireless network compared withLittle receiving power, in an embodiment of the present invention, less receiving power Q of cellrxlevminMay be configured as in the wireless network describedUser equipment resides at the minimal detectable power needed for current area.
Specifically, that is, judge whether to meet：Qrxlevmeas<α；Wherein, QrxlevmeasFor the reception of the current area of UE measurementsPower, specific metering system can be realized using any receiving power metering system of prior art, not done in the present embodimentLimit；α is default received power threshold, can be configured according to communication requirement, but should meet α for negative value, and should meet α>Qrxlevmin, for example, it is set to α=- 96dBm.If meeting Qrxlevmeas<α, such as Qrxlevmeas=-100dBm, if then judging UE weightsNew to access current area, then the communication quality of UE is unsatisfactory for default communication standard；If being unsatisfactory for Qrxlevmeas<α, such as Qrxlevmeas=-92dBm, if then judging, UE accesses current area again, and the communication quality of UE meets default communication standard.
Judgment mode two：
Judge for indicating the relevant parameter of the received signal strength of the current area, if meet and default receive signalStrength criterion, specifically includes：
Judge the receiving power of the current area of the user equipment measurement, the ratio with the less receiving power of cellWhether more than default receiving power ratio, if so, then judge to be unsatisfactory for, if it is not, then judging to meet；Wherein, the default receptionPower ratio is more than 0 and is less than 1.
Specifically, that is, judge whether to meet Qrxlevmeas/Qrxlevmin>β(0<β<1).For example, in TD SDMAIn (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA) network,Qrxlevmin- 103dBm is typically configured to, if expecting the Q of measurementrxlevmeasMeet more than or equal to -96dBm, can arrange β=0.93。
When using aforesaid way, due to QrxlevminRepresent that UE resides in the signal intensity access thresholding of cell, thus it is logicalCross judgement QrxlevmeasWith QrxlevminRatio whether conformance with standard, relative to judgment mode one, can more reasonably embody measurementCurrent area receiving power and the less receiving power of cell relation.In an embodiment of the present invention, the less reception of cellPower QrxlevminThe user equipment is may be configured as in the wireless network resides at the minimal detectable power needed for current area.
Judgment mode three：
It is described to judge for indicating the relevant parameter of the received signal strength of the current area, if to meet default receptionSignal intensity standard, specifically includes：
Judge the path loss of the P-CCPCH to the current area of UE measurements, the ratio with average path loss isIt is no that ratio is lost more than preset path, if so, then judge to be unsatisfactory for, if it is not, then judging to meet；Wherein, the preset path is damagedLoss-rate value is more than 1.
Specifically, that is, judge whether to meet LPCCPCH/L0>γ(γ>1), the concrete numerical value of γ can be set as needed.
Above-mentioned three kinds concrete judgment modes, are used only as the specific example of the embodiment of the present invention, rather than to the embodiment of the present inventionRestriction, it will be appreciated by those of skill in the art that adopt any other mode, judge for indicating the current areaThe relevant parameter of received signal strength, if meet default received signal strength standard, be implemented for enforcement of the present inventionThe technical scheme of example.
Fig. 3 is the schematic flow sheet of the RLF restoration methods of another embodiment of the invention.As shown in figure 3, the RLF recoversMethod includes below scheme：
Step 301, UE detect RLF；
Step 302, judges whether to meet the trigger condition for performing cell update；If so, then execution step 303, if it is not, thenExecution step 310；
Step 303, judges for indicating the relevant parameter of the working frequency points co-channel interference intensity of the current area, ifMeet default interference strength standard；If meeting, execution step 304, if being unsatisfactory for, execution step 306；
Step 304, from the cell with frequency identical with the current frequency of the user equipment, selects for the useFamily equipment accesses the Target cell of wireless network again；
Step 305, the cell of the current frequency with user equipment for judging whether to choose suitable；If so, then performStep 309, if it is not, then execution step 308；
Step 306, selects the more excellent cell with any frequency, for example, selects the optimum subdistrict on any frequency；
Step 307, judges whether to choose the suitable cell with any frequency；If so, then execution step 309, ifIt is no, then execution step 308；
Step 308, judges whether recovery intervalometer is overtimeIf it is not, then execution step 306；If so, then execution step 310；
Step 309, sends cell update and waits the cell update that network side is returned to confirm；
Step 310, UE enter idle condition.
In above-mentioned steps 303, by judging to be used for the working frequency points co-channel interference intensity for indicating the current areaRelevant parameter, if meet default interference strength standard, in realizing above-described embodiment one, if judging to access again described currentWhether cell, the communication quality of UE meet the process of default communication standard.It is following with a kind of phase of specific received signal strengthRelated parameter and accordingly default received signal strength standard, it is illustrative to step 303.
Specifically, in exemplary judgment mode, the working frequency points judged for indicating the current area are with frequencyThe relevant parameter of interference strength, if meet default interference strength standard, specifically include：
Judge whether with the ratio of the signal intensity of the current area more than or equal to preset signal strength ratio andThere is with the current area adjacent cell of identical working frequency points, if so, then judge to be unsatisfactory for, if it is not, then judging to meet.
More specifically, UE is detecting the RLF that betides current area, also includes before：
UE safeguards have in the adjacent cell of identical working frequency points with the current area, specifying with stronger signal intensityThe adjacent cell of quantity, for example, preserve in whole adjacent cells of current area, the mark or letter of 3 most strong adjacent cells of signal intensityNumber intensity；
Wherein, it is described judge whether with the ratio of the signal intensity of the current area more than or equal to preset signals it is strongSpend ratio and there is with the current area adjacent cell of identical working frequency points, specifically include：
In judging the adjacent cell of specified quantity of the maintenance, if having the signal intensity of at least one adjacent cell, meetIt is more than or equal to preset signal strength ratio with the ratio of the signal intensity of the current area, if so, then judges exist, if it is not,Then judge do not exist.
Wherein, preset signal strength ratio is, for example, 8, then most strong by comparing such as 3 signal intensitys of UE maintenancesAdjacent cell, if at least one satisfaction is more than or equal to 8 with the ratio of the signal intensity of current area, if if so, then judging UE weightsNew to access current area, the communication quality of UE is unsatisfactory for default communication standard；If if it is not, it is current little then to judge that UE is accessed againArea, then the communication quality of UE meet default communication standard.
Above-mentioned judgement example is for example realized by following sentence：
Fig. 4 is that an example judges whether current area meets the stream of default interference strength standard in the embodiment of the present inventionJourney schematic diagram.As shown in figure 4, the judgement flow process for performing above-mentioned sentence is comprised the following steps：
Step 401, makes parameter Index=1, wherein, parameter Index is positive integer；
Step 402, judges whether to meet maxdp [Index]/maxdp [0] >=M；Wherein, maxdp [0] represents current littleThe signal most powerful path energy in area, when Index ≠ 0, maxdp [Index] represents the signal most powerful path of the adjacent cell of current areaEnergy, and M is for preset signal strength ratio and M is arithmetic number；If so, then execution step 403, if it is not, then execution step404；
Step 403, judges that current area is unsatisfactory for default interference strength standard, and terminates flow process；
Step 404, makes parameter Index=Index+1；
Step 405, judges whether to meet Index≤N；If so, execution step 402 is then returned, if it is not, then execution step406；Wherein, N is the number of the adjacent cell with stronger signal intensity that UE is safeguarded；
Step 406, judges that current area meets default interference strength standard, and terminates flow process.
In TD-SCDMA network, in the case of the signal intensity of current area is preferable, it is also possible to due to working frequency pointsOn stronger co-channel interference and cause RLF.Due in the prior art, the cell that UE is adapted to according to current dominant frequency point selection, ifThe dominant frequency point of the adjacent cell of stronger signal be it is diverse, then UE because of current area meet access criterion S and againAccess former cell.Therefore, after success recovers from RLF, network may configure working frequency points as before for UE again,UE then can occur RLF due to co-channel interference stronger in working frequency points again.By the RLF recovery sides using the present embodimentMethod, due to when cell selection is performed, if judging to know that the working frequency points co-channel interference of current area is excessive, from any frequencyCell in selected, so that the probability that current area is gone back in UE gravity treatments is greatly reduced, so as to reduce selecting current little again because of UEQu Hou, the probability that RLF occurs again realize effective RLF and recover.
Structural representations of the Fig. 5 for the user equipment of another embodiment of the present invention.As shown in figure 5, the user equipment bagInclude：
Judge module 51, for after the RLF for betiding current area is detected, if judging to access again described current littleWhether area, the communication quality of user equipment meet default communication standard；
Cell reselection module 52, if for meeting, from frequency identical with the current frequency of the user equipmentIn cell, select the Target cell of wireless network is accessed again for the user equipment；If being unsatisfactory for, from arbitrarily frequencyIn the cell of point, select the Target cell of wireless network is accessed again for the user equipment；
Link block 53, is connected for being set up by the Target cell with the selection, completes RLF recoveries.In the present inventionIn one embodiment, link block 53 can be embodied as RRC link blocks, for setting up Radio Resource with the Target cell of the selectionControl connection.In an alternative embodiment of the invention, link block 53 can also be embodied as physical layer connection modules, by with the choosingThe Target cell selected carries out physical layer synchronization (that is, setting up physical layer connection), completes RLF recoveries.
The user equipment of the present embodiment performs the idiographic flow of RLF recoveries and the RLF restoration methods of any of the above-described embodimentIt is identical, therefore here is omitted.
According to the user equipment of the present embodiment, as UE is detecting RLF, when starting to perform cell reselection, first determine whetherIf UE accesses current area again, whether communication quality meets default communication standard, if meeting, even if know that UE gravity treatments are returned working asFront cell, it is also possible to effectively recover wireless link, so selecting the current frequency identical cell with UE, is accessed again as UEThe Target cell of wireless network, to recover rapidly wireless link；If being unsatisfactory for, selected from the cell of any frequency,So that the probability that current area is gone back in UE gravity treatments is greatly reduced, so as to reduce because UE selects current area again lead to not it is effectively extensiveThe probability of multiple link, improves the success rate and effectiveness of wireless link recovery.
Further, in the user equipment of above-described embodiment, judge module specifically includes the first judging unit orTwo judging units.Wherein, the first judging unit is used for the correlation of the received signal strength for judging to be used to indicate the current areaParameter, if meet default received signal strength standard；Second judging unit is used to judge for indicating the current areaThe relevant parameter of working frequency points co-channel interference intensity, if meet default interference strength standard.
Further, in the user equipment of above-described embodiment, first judging unit specifically includes the first judgementUnit, the second judgment sub-unit or the 3rd judgment sub-unit.Wherein, the first judgment sub-unit is used to judge the user equipmentThe receiving power of the current area of measurement, if less than default received power threshold, if so, then judges to be unsatisfactory for, if it is not,Then judge to meet；Wherein, the less receiving power of cell that the default received power threshold is arranged in being more than wireless network, whereinIn an embodiment of the present invention, less receiving power Q of cellrxlevminMay be configured as the user equipment in the wireless network to be residentIn the minimal detectable power needed for current area.Second judgment sub-unit is used to judge the described current of the user equipment measurementWhether the receiving power of cell, with the ratio of the less receiving power of cell more than default receiving power ratio, if so, then judge notMeet, if it is not, then judging to meet；Wherein, the default receiving power ratio is more than 0 and is less than 1.3rd judgment sub-unit is used forJudge the path loss of the Primary Common Control Physical Channel PCCPCH to the current area of user equipment measurement, it is and flatThe ratio of equal path loss, if ratio is lost more than preset path, if so, then judges to be unsatisfactory for, if it is not, then judging to meet；Wherein, the preset path loss ratio is more than 1.
Further, in the user equipment of above-described embodiment, second judging unit specifically includes the 4th judgementUnit.Wherein, the 4th judgment sub-unit is used to judge whether that the ratio with the signal intensity of the current area is more thanThere is in preset signal strength ratio and with the current area adjacent cell of identical working frequency points, if so, then judge discontentedFoot, if it is not, then judging to meet.
Further, in the user equipment of above-described embodiment, second judging unit also includes same frequency adjacent cellSubelement is safeguarded, is had in the adjacent cell of identical working frequency points with the current area for safeguarding, with stronger signal intensitySpecified quantity adjacent cell；
Wherein, the 4th judgment sub-unit is specifically for judging in the adjacent cell of specified quantity of the maintenance, ifThere is the signal intensity of at least one adjacent cell, satisfaction is more than or equal to preset signals with the ratio of the signal intensity of the current areaIntensity rate, if so, then judges exist, if it is not, then judging do not exist.
According to the user equipment of above-described embodiment, due to when cell selection is performed, if judging to know the work of current areaMake frequency point co-frequency interference excessive, then selected from the cell of any frequency, current area is gone back to so that UE gravity treatments are greatly reducedProbability, the probability that RLF, so as to reduce being selected behind current area again because of UE, occurs again realize effective RLF and recover.
Finally it should be noted that：Above example only to illustrate technical scheme, rather than a limitation；AlthoughWith reference to the foregoing embodiments the present invention is described in detail, it will be appreciated by those skilled in the art which still can be to frontState the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic；And theseModification is replaced, and does not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.