CN201365345Y - Wireless emitting/receiving unit - Google Patents

Wireless emitting/receiving unit Download PDF

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CN201365345Y
CN201365345Y CNU2008200089481U CN200820008948U CN201365345Y CN 201365345 Y CN201365345 Y CN 201365345Y CN U2008200089481 U CNU2008200089481 U CN U2008200089481U CN 200820008948 U CN200820008948 U CN 200820008948U CN 201365345 Y CN201365345 Y CN 201365345Y
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value
serving cell
wireless transmitter
receiver unit
wtru
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S·索马桑德朗
M·萨摩尔
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InterDigital Technology Corp
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InterDigital Technology Corp
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Abstract

The utility model discloses a wireless emitting/receiving unit, comprising an antenna, a receiver which is coupled at the antenna and used for receiving signals, a processor which is coupled at the receiver and used for deciding the re-selected times of the district, deciding the moving state of the wireless emitting/receiving unit according to the re-selected times of the district, corresponding to and determining the high moving state of the wireless emitting/receiving unit through a first value by zooming the lagging value of the service district and corresponding to and determining the moderate moving state of the wireless emitting/receiving unit through the second value by zooming the lagging value of the service district.

Description

Wireless transmitter/receiver unit
Technical field
The application relates to radio communication.
Background technology
Third generation partner program (3GPP) has started Long Term Evolution (LTE) project at present and has thought that wireless cellular network brings new technology, the new network architecture and configuration and new application and service, so that the stand-by period of spectrum efficiency, the minimizing of improvement, user experience and the abundanter application and the service of lower cost faster are provided.The purpose of LTE is to realize evolved universal terrestrial radio access network (UTRAN).This notion is applied to LTE and is applied to every other Universal Mobile Telecommunications System (UMTS) system equally, inserts (HSDPA), High Speed Uplink Packet access (HSUPA), high-speed packet access (HSPA) enhanced edition or any other version as version 99, high-speed downlink packet.
In the UMTS system, occupied (camp on) by WTRU when the sub-district, this WTRU searches for better sub-district termly according to one group of standard.If found better sub-district, then select this sub-district.In the UMTS system in early days, when WTRU is in one in idle condition, radio resource control (RRC) cell forward access channel (FACH) state and RRC cell paging channel (PCH) state, all can carry out (per performed) sub-district gravity treatment at every turn.In the LTE that only has LTE_ free time and LTE_ activation two states, described WTRU can only carry out the sub-district gravity treatment under the LTE_ idle condition.
Gravity treatment is very different mechanism with switching.WTRU carries out gravity treatment under the RRC_ idle condition.WTRU carries out switching under the RRC_ connection status.Gravity treatment is independently to carry out (that is, based on some parameter that is sent with signal by network).Switching is by network control and guide.
In UMTS system before, before the sub-district is occupied in the WTRU decision, need to check earlier some basic standard of its sub-district of being stationed.In fact, signal quality metrics S Qual＞0 and received signal level tolerance S Rxlev＞0 condition need be satisfied, so that WTRU occupies the sub-district, and S wherein QualAnd S RxlevMeasure by following equation:
S Qual=E c/ I o-Q Qual minEquation (1)
Wherein, E cBe the channel code power of sub-district, and I oIt is the total interference in the sub-district.Therefore, E c/ I oBe the dimensionless ratio (dimensionlessratio) of the average power and the total signal power of channel (being pilot channel), and measure by WTRU.Q Qual minBe based on E c/ I oMinimum required quality metric.Q Qual minExtract from system information block 3 (SIB 3), broadcast by system, and
S rxlev＝RSCP-Q rxlev?min-max(WTRU_TXPWR_MAX_RACH-P_MAX，0)，
Equation (2)
Wherein received signal code power (received signal code power) (RSCP) is measured by WTRU, and Q Relev minTransmit in SIB 3 with WTRU_TXPWR_MAX_RACH.Q Qual minBe based on E c/ I oMinimum required quality metric, Q Rxlev minBe based on the minimum required quality metric of RSCP, and WTRU_TXPWR_MAX_RACH is the up link that is allowed to (UL) transmission (TX) power of the maximum of Random Access Channel (RACH).
Though in UMTS version before, measuring amount is E c/ I oOr RSCP, but also do not determined in measuring amount described in the LTE.Reference symbol received power (reference symbol received power) is that the LTE that is similar to RSCP measures (RSRP).The reference symbol quality of reception (reference symbolreceived quality) also is that LTE measures (RSRQ), and this LTE measurement is similar to E c/ I o
Except Q Qual min, Q Rxlev minOutside WTRU_TXPWR_MAX_RACH, below other parameters also in SIB 3, transmit to be used for the sub-district gravity treatment:
1) S Int rasrch(optionally): such as equation (1) definition, work as S QualBe less than or equal to S Int rasrchThe time, neighbor cell in WTRU measures frequently.If S Int rasrchDo not specified by network, then described WTRU measures frequently interior neighbor cell all the time.
2) S Int ersrch(optionally): such as equation (1) definition, work as S QualBe less than or equal to S Int ersrchThe time, neighbor cell between WTRU measures frequently.If S Int ersrchDo not specified by network, then described WTRU measures neighbor cell between frequency all the time.
3) S SearchR4T(optionally): such as equation (1) definition, work as S QualBe less than or equal to S SearchRATThe time, neighbor cell between WTRU measure R AT.If S SearchRATDo not specified by network, then described WTRU measures neighbor cell between RAT all the time.As long as S SearchRATNot designated just neighbor cell between measure R AT all the time.
4) Q Hystls: this is the lagged value (measured by RSCP) that is added into the Serving cell signal quality, in order to increase the grade of Serving cell.
5) Q Hyst2s: this is to be added into the lagged value of Serving cell signal quality (by E c/ I oMeasured), in order to increase the grade of Serving cell.
6) T Resel: neighbor cell should meet the time of cell reselection criteria before WTRU carries out gravity treatment to neighbor cell.
Below be some important parameters that in SIB 11, transmit:
1) neighbor cell list (NCL).
2) Q Offset1s: the mass shift (qualityoffset) that is used for Serving cell being carried out classification based on RSCP.
3) Q Offset2s: be used for based on E c/ I oServing cell is carried out the mass shift of classification.
4) WTRU_TXPWR_MAX_RACH: the UL TX power that is allowed to of the maximum of neighbor cell.
5) Q Qual min: based on E c/ I oMinimum required quality metric.
6) Q Rxlev min: based on the minimum required quality metric of RSCP.
Use these parameters, WTRU can carry out classification to its Serving cell and neighbor cell.The Serving cell grade is expressed as follows:
Rank_s=E c/ I o+ Q Hyst2+ Q Offmbms. equation (3)
The value Q that this is sent out OffmbmsIt is the deviant that is added into the sub-district (service or adjacent) that belongs to multimedia broadcast/multi broadcast service first choice layer (MBMS PL).
As mentioned above, Q Hyst2sBe by the static parameter of the WTRU indication of network in SIB 3, to be used for that Serving cell is carried out classification in current UMTS system.
The neighbor cell grade is expressed as follows:
NRank_s=E c/ I o-Q Offset2+ Q OffmbmsEquation (4)
When measuring amount is RSCP, but application class is similar to the grade equation of equation (4).For by the specific cell of gravity treatment, equaling T ReselCycle in the neighbor cell grade must be higher than the Serving cell grade.Even it is very fast that the grade of Serving cell descends, the value T of grade or reselection timer ReselAll can not be modified to be used for neighbor cell being carried out gravity treatment with faster rate.
Except reselection criteria, also can carry out the scalability factor that is used for high mobility state (being that WTRU is with high-speed mobile).Therefore, when in the special time period T CRmaxThe number of times exceedance N of sub-district gravity treatment during this time CRThe time, will detect the high mobility state.When detecting the high mobility state, according to will be performed be frequently in or frequently between select or RAT between select, if the scalability factor is sent with signal by network as the optional parameters in SIB3, then with reselection timer value T ReselMultiply each other with the scalability factor.
In many cases, above-mentioned mobility status can not be implemented.For instance, Serving cell WTRU may be in decline, and is not in mobility status.Under these circumstances, this WTRU may not keep and call out and need quickly that the gravity treatment neighbor cell is stopped service to stop in idle condition, perhaps prevents described WTRU at other states, for example obliterated data under the FACH state.
Replacedly, WTRU can be in the high mobility state but cross single big sub-district, and therefore, described WTRU may not meet the existing standard of sub-district gravity treatment.Serving cell may weaken (drop) under these circumstances rapidly, and described WTRU needs once more gravity treatment neighbor cell apace.
Replacedly, owing to need read SIB through the time cycle that prolongs, WTRU can spend long time and come re-selecting cell, perhaps because decline rapidly at WTRU gravity treatment this Serving cell signal quality before another sub-district, WTRU can just be stopped service between the gravity treatment of sub-district, this WTRU does not meet the standard of high mobility yet under these circumstances.
When WTRU is in state of activation, need switch to neighbor cell.In the UMTS system, this can be soft handover or direct-cut operation.In LTE, WTRU only is allowed to carry out direct-cut operation.
Under state of activation, WTRU measures the sub-district in its neighbor cell list that sends in SIB 11 or measurement control messages all the time.If neighbor cell list is as being deleted or remove discussing among the LTE, then WTRU also can search for and detect and carry out on described sub-district and measure neighbor cell.
When neighbor cell surpassed the reporting range threshold value or meets permit standard, WTRU started the triggered time (TTT), and this TTT has defined WTRU and sent measurement report and need the minimum time amount waited for before.The TTT timer can be used for setting up the duration of described TTT.In SIB or measurement control messages, be that each incident is specified TTT.If TTT expires and remains on the threshold value at whole TTT duration neighbor cell, then with suitable Event triggered measurement report.Network then responds with activating set updating (ASU) or switching command.If during TTT, neighbor cell signal is measured (for example, signal strength signal intensity, signal quality) and is dropped under the preset signals quality, and then the TTT of described neighbor cell is terminated.Described neighbor cell need turn back on the permit standard of WTRU to start the measurement of sub-district once more.
If during described process, the Serving cell signal weakens rapidly, or the decline of Serving cell signal quality, and then WTRU perhaps can not receive the ASU or the switching command of automatic network.Similarly, neighbor cell may impel WTRU to start and stop TTT thereby cause in slight fluctuations about the threshold value.Therefore, WTRU may never manage to trigger measurement report so that neighbor cell is carried out gravity treatment.
In the UMTS system that adopts soft handover, this problem is not topmost.Yet in the LTE that does not adopt soft handover, this problem is particularly important.Therefore, wish to have the more sound handover scheme of considering WTRU Serving cell condition.
The utility model content
Order of the present utility model ground is in order to solve handover scheme and the unsound problem of not present WTRU in the sub-district, to provide WTRU can reduce the effect of institute's spended time when the re-selecting cell, therefore disclose the wireless transmitter/receiver unit that comprises processor, this processor is configured to determine the number of times of sub-district gravity treatment, this number of times according to the sub-district gravity treatment decides the wireless transmitter/receiver unit mobility status, the Serving cell lagged value being carried out convergent-divergent by first value responds and determines that this wireless transmitter/receiver unit mobility status is high and by second value this Serving cell lagged value is carried out convergent-divergent to respond definite this wireless transmitter/receiver unit mobility status be medium.Also disclose and be used for overcoming the several different methods that UMTS has the defective of WTRU speed testing mechanism now.Existing WTRU speed testing mechanism with and the method used from UMTS be inadequate.Therefore, use signal measurement (for example signal strength signal intensity, signal quality) to overcome the defective of existing WTRU speed testing mechanism.Thus, some reselecting parameters time value T of lagged value and gravity treatment meter timer for example ReselBe modified.Similarly, the hysteresis mass value can carry out convergent-divergent by the existing WTRU speed detection technique among the UMTS.In order to switch, having needs to carry out the situation that service signal is measured and changed TTT.Therefore, because service signal is measured and WTRU velocity correlation connection, TTT is modified according to WTRU speed.
A kind of wireless communications method of adjusting the classification standard of the Serving cell that is associated with WTRU disclosed herein.Carry out the signal measurement (for example RSRQ, RSCP, RSRP) of Serving cell.If the signal measurement result of Serving cell has exceeded first threshold, then the Serving cell lagged value is set as first value.If the signal measurement result of Serving cell has continued the very first time at interval less than first threshold greater than second threshold value, then the Serving cell lagged value is set as second value.If the signal measurement result of Serving cell continued for second time interval less than second threshold value, then the Serving cell lagged value is set as the 3rd value.The classification standard of Serving cell is adjusted based on being set as the Serving cell lagged value afterwards of one in first value, second value and the 3rd value.
A kind of wireless communications method of adjusting the classification standard of the neighbor cell that is associated with WTRU disclosed herein.Carry out the signal measurement (for example, RSRQ, RSCP, RSRP) of Serving cell.If Serving cell signal measurement result has exceeded first threshold, then the neighbor cell deviant is set as first value.If Serving cell signal measurement result has continued the cycle very first time less than first threshold greater than second threshold value, then the neighbor cell deviant is set as second value.If Serving cell signal measurement result continued for second time cycle less than second threshold value, then the neighbor cell deviant is set as the 3rd value.The classification standard of neighbor cell is adjusted based on being set as the neighbor cell deviant afterwards of one in first value, second value and the 3rd value.
A kind of wireless communications method of adjusting the classification standard of the Serving cell that is associated with WTRU is also disclosed herein.Reselection timer among the WTRU is set as first value.Lagged value is set as second value.The a plurality of sub-districts gravity treatment that is associated with WTRU that takes place during the monitoring predetermined time cycle.(mobility factor) is monitored for the mobility factor that is associated with WTRU.If sub-district gravity treatment number of times exceeds the 3rd value, and detect the high mobility factor, whether decision will adjust reselection timer by using first scale factor to multiply by first value, and/or, reduce the ordering of this Serving cell by using second value that multiply by described lagged value with second scale factor to adjust the ordering rule of Serving cell.
A kind of wireless communications method of in WTRU, adjusting reselection timer disclosed herein.Carry out the signal measurement of described Serving cell, (for example, RSRQ, RSCP, RSRP).If the signal measurements of described Serving cell has exceeded first threshold, the reselection timer of this WTRU just is set at first value.If the signal measurements of described Serving cell is lower than first threshold and is higher than second threshold value in very first time section, the reselection timer of this WTRU just is set at second value.If the signal measurements of described Serving cell is lower than second threshold value in second time period, the reselection timer of this WTRU just is set at the 3rd value.
A kind of cell signal measurement report method of being carried out by WTRU is also disclosed herein.Carrying out Serving cell signal measurement and neighbor cell signal measures.In the time of on the neighbor cell signal measurement result increases to the reporting range threshold value, start TTT at interval.If the Serving cell signal measurement is the result be reduced under the serving cell threshold, then transmitted measurement report before TTT expires at interval, this measurement report is used for Serving cell signal measurement result has been reduced to circulates a notice of and provides information about the neighbor cell that is used to generate switching command under the serving cell threshold.Replacedly, if Serving cell signal measurement result is reduced under the serving cell threshold and at the fixed time interval section keep below described threshold value, then transmit measurement report in TTT interim, this measurement report is used for Serving cell signal measurement result has been reduced to circulates a notice of and provides information about the neighbor cell that is used to generate switching command under the serving cell threshold.
Description of drawings
By description below in conjunction with accompanying drawing, can understand the utility model in more detail, wherein:
Fig. 1 shows unlike signal in time and the variation of other amounts of using in switching decision;
Fig. 2 is the flow chart of cell reselection process;
Fig. 3 is the flow chart of the handover process of use TTT scaling;
Fig. 4 is the profile instance that is used to carry out the WTRU of method disclosed herein;
Fig. 5 is the flow chart of the wireless communications method of the classification standard of adjusting the Serving cell be associated with WTRU;
Fig. 6 is the flow chart of the wireless communications method of the classification standard of adjusting the neighbor cell be associated with WTRU;
Fig. 7 is the flow chart of the wireless communications method of the classification standard of adjusting the Serving cell be associated with WTRU;
Fig. 8 is the flow chart of the wireless communications method of the reselection timer among the adjustment WTRU; And
Fig. 9 and 10 is the flow chart by the cell signal measurement report method of WTRU execution.
Embodiment
The term of hereinafter quoting " wireless transmitter/receiver unit (WTRU) " is including, but not limited to the subscriber equipment that can work in wireless environment of subscriber equipment (UE), mobile radio station, fixing or mobile contracted user unit, beep-pager, cell phone, PDA(Personal Digital Assistant), computer or any other type.
The term of hereinafter quoting " base station " can be crossed the interface equipment of working including, but not limited to node-b, site controller, access point (AP) or any other type under wireless environment.
In disclosed herein first kind of wireless communications method, LTE is the emphasis of system, and RSRQ and RSRP are as measuring amount.Replacedly, also other measuring amount can be selected and the utility model can be do not influenced.Following being applied among current UMTS system and the LTE.
Q Hyst1sIt is the lagged value that sends with signal.In following method, this lagged value is by bi-directional scaling, and is known as Q HystNew lagged value be introduced into, this new lagged value is measured (RSRQ, RSCP, RSRP) based on service signal, described measurement (in turn) successively is a mobility measurements.
It is too fast to appear at sub-district gravity treatment generation Serving cell signal quality decline before, or does not also meet the situation of high mobility standard.Therefore, WTRU is failed by the sub-district gravity treatment may.This problem can solve by when carrying out the sub-district gravity treatment Serving cell quality being taken into account.Although (while) occupy the sub-district standard may with system formerly in remain unchanged or be modified, the change of classification standard itself and reselection timer will disclose herein.
The multiple variation of Serving cell and neighbor cell being carried out classification all is feasible.Should be noted that following all equatioies have all used measuring amount RSRQ, as previously mentioned, suppose this RSRQ and E c/ I oSimilar.Equation can adopt measuring amount RSRP to write like one category, as previously mentioned, supposes that this RSRP and RSCP are similar.Should be noted that in following equation amount RSRQ can be measured to substitute by any other " signal quality " that is fit to, measuring RSCP simultaneously can be substituted by any other measurement that " signal level (singal level) " that is fit to measures or any other is fit to.
For Serving cell, classification standard remains unchanged, that is:
Rank_s=RSRQ s+ Q Hyst2s+ Q Offmbms, equation (5)
Wherein, RSRQ sIt is the reference symbol quality of reception of Serving cell.
For neighbor cell, in any case, classification standard be modified into:
Rank_n=RSRQ n-Min (Q Offset2, Q Hyst)+Q Offmbms, equation (6)
RSRQ wherein nBe the reference symbol quality of reception of neighbor cell n, or normally,
Rank_n=function (RSRQ n, Q Offset2, Q Offmbms, RSRQ s). equation (7)
By making Rank_n become one with RSRQ sAnd the function that changes, we promote classification standard and avoid potential problem in the existing sub-district gravity treatment scheme.
Be referred to as Q HystAdditional parameter be introduced into, do following application by WTRU:
If RSRQ s＞x, equation (8)
Wherein x is a Serving cell signal measurement threshold value,
Q Hyst=z1 dB; Equation (9)
In addition, if for time interval T 11If, x＞RSRQ s＞y; Equation (10)
T wherein 11Be timer value, be used to indicate the RSRQ must be in the time interval between two threshold value x and the y.
Q hyst＝z3?dB。Equation (11)
In addition, if for time interval T 12, RSRQ s＜y, equation (12)
Q Hyst=z2 dB, equation (13)
Wherein z1＞z3＞z2 and x＞y.
Value x, y, z1, z2, z3, T 11And T 12Can depend on execution, by network definition or after analog result, carry out standard definition.T 11And T 12It is the time interval that the condition of RSRQ is satisfied.Serving cell threshold or Q HystValue can dynamically be transmitted (for example, with one or more SIB) by RRC message.
When WTRU Serving cell signal measurement result was under threshold value, the neighbor cell grade was improved than low value by deduct one from measuring amount, and described in this case measuring amount is RSRQ.If the Serving cell signal measurements is on threshold value, then according to described threshold value and according to the value of z1 and z3, the still value of deducting Q Offset2Or amount z1 or z3.In order to make described algorithm more effective, z2 must be at least less than Q Offset2
Replacedly, can adopt the two-stage threshold value herein, on value x, can use the similar lagged value of in the UMTS system, using at present in this case, perhaps can use new lagged value z1.If at time interval T 13, the signal strength signal intensity of WTRU drops to below the value x, then can use Q HystValue z2.Replacedly, WTRU can use one of existing threshold value, for example Q Qual min, send new value x and need not network with signal, be worth x and network under these circumstances and need not to send any new threshold value with signal.Similarly, for time interval T 13, WTRU can use one of existing time cycle value that is sent with signal by network, and may not need send new time interval value T by network with signal 13
Replacedly, network can send a value (for example z1) by signal, and scalable value assists WTRU to calculate the scalability value of z2 and z3 with this numerical value, and need not to define different values.
Replacedly, can use n level rather than three grades, n 〉=2 wherein, wherein threshold value can depend on once more and carry out or by the network definition or carry out standard definition after analog result.Described threshold value can dynamically be transmitted (for example with one or more SIB) by RRC message.
Replacedly, disclosed equation also can be write as follows more than:
For Serving cell, classification standard be modified into:
Rank_s=RSRQ s+ Min (Q Hyst2, Q Hyst)+Q Offmbms. equation (14)
For neighbor cell, the sub-district grade remains unchanged:
Rank_n=RSRQ n-Q Offset2+ Q Offmbms. equation (15)
To Q HystCalculating same as described above.
Replacedly, value Q Hyst2Or Q Offset2Can be removed, and equation can be write as follows:
For Serving cell, classification standard can remain unchanged:
Rank_s=RSRQ s+ Q Hyst2+ Q Offmbms. equation (16)
For neighbor cell, classification standard be modified into:
Rank_n=RSRQ n-Q Hyst+ Q Offmbms. equation (17)
To Q HystCalculating same as described above.
Replacedly, for Serving cell, classification standard can be modified into:
Rank_s=RSRQ s+ Q Hyst+ Q Offmbms. equation (18)
For neighbor cell, the sub-district grade is remained unchanged:
Rank_n=RSRQ n-Q Offset2+ Q Offmbms. equation (19)
To Q HystCalculating then same as described above.
When measurement parameter is RSRP, can uses and adopt parameter Q HystA category like equation.
Even above-mentioned equation is used for off grade cell structure (HCS), when adopting HCS, parameter Q HystAlso can be applied in the described equation.
Should be noted that in the equation formerly, by with Q OffmbmsBe made as 0, can offset the MBMS influence (for example, under the situation that does not have the MBMS service or in cell reselection criteria, do not want it is considered) of expection.
Replacedly or additionally, disclose when in certain period of time T CRmaxThe number of times exceedance N of sub-district gravity treatment during this time CRAnd when detecting the high mobility state, suggestion is also selected Q HystOn duty with zoom factor reducing the grade of Serving cell, and be unlike in the current UMTS system like that only with T ReselMultiply by zoom factor.With T ReselOn duty the time with zoom factor, also can be with Q HystValue and zoom factor multiply each other, perhaps only with T ReselAnd Q HystIn one multiply by zoom factor, this zoom factor can be decided according to for example factor of radio condition by WTRU self, or sends with signal by network that the sub-district belonged to or based on any other factor.This is used for Q HystZoom factor can be used for T ReselZoom factor identical, or can send another zoom factor by signal, be used for and Q HystValue multiplies each other.
At T ReselIn the time interval, multistage reselection timer is carried out following operation:
If RSRQ s＞x, the then T that can be used ReslThe value of (reselection timer) can be identical with the value of the current reselection timer that uses in the UMTS system, (promptly not needing convergent-divergent).
In addition, if at time interval T 14, x＞RSRQ s＞y, then T ReselThe value of being reduced to z3.
In addition, if at time interval T 15, RSRQ s＜y, then T Resel=0 or equal a very little value z2,
Wherein z1＞z3＞z2 and x＞y.
Value x, y, z1, z2, z3, T 14And T 15Can depend on and carry out or by the network definition or after analog result, carry out standard definition.Time interval T 14And T 15It is the time interval that the condition of RSRQ is satisfied.They can dynamically be transmitted (for example, with one or more SIB) by RRC message.
In general, reselection timer is adjusted and generates RSRQ sFunction:
T resel＝function(RSRQ s).
As can be seen, according to the intensity of WTRU Serving cell, timer T ReselValue be reduced to be used for gravity treatment neighbor cell quickly.
Replacedly, the two-stage threshold value can be adopted, on value x, similar timer T can be used in this case as current UMTS system ReselValue or the value z1 of new reselection timer, and if at time interval T 16The signal strength signal intensity of interior WTRU drops under the value x, then adopts the value T of the timer that reduces ReselPerhaps do not adopt the value of reselection timer.Replacedly, WTRU can use present with one in the current threshold value of signal transmission, for example Q Qual min, send new value x and need not network with signal, be worth x and network under these circumstances and need not to send any new threshold value with signal.Similarly, for time interval T 16, WTRU can use one of existing timer value that network sends with signal, and network may not need send new time interval value T with signal 16Time interval T 14, T 15And T 16Can with time interval T 11, T 12And T 13Identical, or can be different.
Replacedly, network can send a value (for example z1) by signal, and scalable value assists WTRU to calculate the scalability value of z2 and z3 with this numerical value, and need not to define different values.
Replacedly, can use n level rather than 2 or 3 grades, n＞=2 wherein, wherein threshold value can depend on once more and carry out or by the network definition or carry out standard definition after analog result.Described threshold value or timer value can dynamically be transmitted (for example, with one or more SIB) by RRC message.
No matter network or WTRU all can determines employing self adaptation classification standard and reselection timer or adopt one of them with the more sound sub-district gravity treatment of realization separately.
For the self adaptation gravity treatment notion based on signal strength signal intensity disclosed herein, with T ReselOn duty the time with zoom factor, also with Q HystOn duty with zoom factor, perhaps only with T ReselAnd Q HystIn one multiply by zoom factor, this zoom factor can be decided according to for example factor of radio condition by WTRU self, or sends with signal by network that the sub-district belonged to or based on any other factor.This is used for Q HystZoom factor can be used for T ReselZoom factor identical, or can send another zoom factor by signal, be used for and Q HystValue multiplies each other.Similarly, the zoom factor of more than proposing that is used for the self adaptation reselecting method with the signal transmission can be identical with the current zoom factor that is used for the high mobility situation that sends with signal, or can send another zoom factor by signal, to be used for the self adaptation gravity treatment based on signal strength signal intensity is specific.
Below described the alleviation situation of the handoff failure that is caused by too fast the weakening of Serving cell, wherein in handover process, the Serving cell quality is considered.
Illustrated among Fig. 1 and be used to trigger the time graph that is reduced to the measurement report under the threshold value for Serving cell signal measurement result, wherein the following has been supposed:
The signal measurement (for example RSRQ, RSCP, RSRP) that Serving cell is overtime.
The signal measurement that neighbor cell is overtime, (for example RSRQ, RSCP, RSRP).
Serving cell threshold x: Serving cell sends measurement report to network in the time of under this threshold value.
Reporting range: in the time of on this scope, the TTT on the neighbor cell is activated at interval.
Time T 1: neighbor cell increases on the reporting range to start the TTT interlude.
Time T 2: the signal measurement result of Serving cell is reduced under the serving cell threshold x and sends the time of measurement report to network, described measurement report is used for Serving cell signal measurement result has been reduced to circulates a notice of and provides information about neighbor cell under the described threshold value, carry out countdown at interval at the above TTT of described neighbor cell.
Replacedly, time interval T4 (not shown in Figure 1) rather than value T2 can be used as Serving cell signal measurement result and need arrive time quantum under the serving cell threshold x.Therefore, reach time interval T4 when Serving cell has become certain threshold level, WTRU can send measurement report.And serving cell threshold can be one of value that has been transmitted in SIB, for example Q Qual min, perhaps described serving cell threshold can be individually measured control messages by broadcast or the RRC by the part appointment and is transmitted.
Time T 3:TTT expires at interval and WTRU can circulate a notice of measurement report time to network as before.
As shown in Figure 1, when the neighbor cell signal measurement result increased on the reporting range, WTRU can be neighbor cell and starts TTT at interval.During TTT carries out at interval, if Serving cell signal measurement result is reduced under the serving cell threshold x, then WTRU can send measurement report before TTT expires at interval, and this measurement report is used for Serving cell signal measurement result is reduced under the serving cell threshold x to be circulated a notice of.Described measurement report can also be discerned neighbor cell, carries out countdown at interval at the above TTT of described neighbor cell, asks network to generate switching command immediately to quicken switching thus.
Replacedly, after starting the TTT interval, if reducing and remain on, Serving cell signal measurement result reaches time interval T4 under the serving cell threshold x, then WTRU can send indication Serving cell signal measurement result and has been reduced to the measurement report under the serving cell threshold x and neighbor cell discerned, the above TTT carries out countdown at described neighbor cell, asks network to send switching command immediately to quicken switching thus.If do not receive switching command, and if described TTT expires at interval and neighbor cell remains on the reporting range at whole TTT interval duration, then trigger test report with suitable incident.For instance, be provided with when neighbor cell is increased to activate, and receive switching command, then WTRU can stop its TTT interval and carry out handover process.
Replacedly, if there is not neighbor cell to meet reporting standards, if perhaps TTT at interval duration neighbor cell signal measurement result be reduced under the standard of withdrawing from and Serving cell signal measurement result is reduced under the threshold value, then WTRU still can send measurement report to network, and this measurement report is used for Serving cell signal measurement result is reduced under the described threshold value to be circulated a notice of.Described network then can utilize the blind switching of this information and executing, perhaps sends a signal to WTRU with minimizing TTT interval and/or reduction reporting range, or adopts any form that is considered to be fit to the WTRU/ scheme.
Network can be in SIB or is measured in control messages or any other message and send serving cell threshold, and perhaps this threshold value can be determined or mentioned in standard based on analog result by WTRU.
In the self adaptation principle that sent measurement report before TTT expires at interval based on serving cell threshold can be applicable to frequently and/or between frequency and/or the switching between RAT.
If it is too fast that Serving cell signal measurement result reduces, or TTT is long at interval and the Serving cell quality descends, and can adopt above-mentioned method and apparatus to preserve calling.And by adopting adaptive cell gravity treatment and handover process, WTRU more may keep service and keep calling during sub-district gravity treatment and handover process.
Fig. 2 is the flow chart of cell reselection process 200.This cell reselection process starts from step 205.In step 210, determine Serving cell signal measurement result and/or sub-district gravity treatment number of times (detection of WTRU mobility).If Serving cell signal measurement result and/or sub-district gravity treatment number of times are low, then indicate high mobility, Q HystAnd/or T ReselAdopt identical or different zoom factor to carry out bi-directional scaling (that is, described parameter by bi-directional scaling to lower value) in step 215.If Serving cell signal measurement result and/or sub-district gravity treatment number of times are medium, then indicate average mobility, Q HystAnd/or T ReselAdopt identical or different zoom factor to carry out bi-directional scaling (that is, described parameter by bi-directional scaling to median) in step 220.If Serving cell signal measurement result and/or sub-district gravity treatment number of times height are then indicated Hypomobility, Q HystAnd/or T ReselAdopt identical or different zoom factor to carry out bi-directional scaling (that is, described parameter is scaled to the value that sends with signal, or remains unchanged) in step 225.In step 230, according to the state of WTRU, gravity treatment equation in sub-district can be used Q HystAnd T ReselCorrect value.In step 235, by finishing cell reselection process 200 to carrying out gravity treatment by the expectation sub-district of gravity treatment equation indication.
Fig. 3 is the flow chart that adopts the handover process 300 of TTT scaling.In step 305, when the signal measurement result of neighbor cell increases on the Serving cell signal threshold value, start TTT at interval.In step 310, carry out Serving cell signal measurement (detection of WTRU speed).In step 315, if Serving cell signal measurement result is reduced under the serving cell threshold, or predetermined time cycle keeps below serving cell threshold, and then TTT is reduced/bi-directional scaling (step 320) at interval.Otherwise, keep described TTT value (step 325) at interval with the signal transmission.In step 330, when TTT expires at interval, send measurement report to be used to generate switching command.
Fig. 4 shows the profile instance of the WTRU 400 that is used to carry out method disclosed herein.WTRU 400 comprises transmitter 405, receiver 410, antenna 415, processor 420, reselection timer 425 and TTT timer 430.
Receiver 410 is configured to carry out the signal measurement (for example RSRQ, RSCP, RSRP) of Serving cell.When the signal measurement result that processor 420 is configured at Serving cell exceeds first threshold the Serving cell lagged value is made as first value, continue the very first time less than first threshold greater than second threshold value in the signal measurement result of Serving cell and the lagged value of Serving cell has been made as second value at interval the time, lagged value with Serving cell when the signal measurement result of Serving cell continued for second time interval less than second threshold value is made as the 3rd value, and based on being set as first value, the Serving cell lagged value of one of second value and the 3rd value is adjusted the classification standard of Serving cell.
Receiver 410 also is configured to carry out the signal measurement (for example RSRQ, RSCP, RSRP) of Serving cell.When the signal measurement result that processor 420 is configured at Serving cell exceeds first threshold the neighbor cell deviant is made as first value, continue the very first time less than first threshold greater than second threshold value in the signal measurement result of Serving cell and the neighbor cell deviant has been made as second value at interval the time, when the signal measurement result of Serving cell continued for second time interval less than second threshold value, the neighbor cell deviant is made as the 3rd value, and based on being set as first value, the neighbor cell deviant of one of second value and the 3rd value is adjusted the classification standard of neighbor cell.
When the signal measurement result that processor 420 also is configured at Serving cell exceeds first threshold reselection timer 425 is made as first value, continued the very first time less than first threshold greater than second threshold value in the signal measurement result of Serving cell and reselection timer 425 is made as second value and when the signal measurement result of Serving cell continued for second time interval less than second threshold value reselection timer 425 is made as the 3rd value at interval the time.
Receiver 410 also is configured to carry out the Serving cell signal measurement and neighbor cell signal is measured.Start the TTT interval of setting up by TTT timer 430 when processor 420 also is configured on the neighbor cell signal measurement result increases to the reporting range threshold value and adjust this TTT at interval.Transmitter 405 is configured to transmit measurement report before TTT expires at interval when Serving cell signal measurement result is reduced under the serving cell threshold, and this measurement report is used for Serving cell signal measurement result has been reduced to circulates a notice of and provide information about the neighbor cell that is used to generate switching command under the serving cell threshold.Transmitter 405 also is configured to when Serving cell signal measurement result is reduced under the serving cell threshold and keeping below described threshold value and reach predetermined time interval to transmit measurement report in TTT interim.
Fig. 5 is the flow chart of wireless communications method 500 of adjusting the classification standard of the Serving cell be associated with WTRU.In step 505, carry out the signal measurement (for example RSRQ, RSCP, RSRP) of Serving cell.In step 510, if the signal measurement result of Serving cell has exceeded first threshold, then the Serving cell lagged value is set as first value.In step 515, if the signal measurement result of Serving cell has continued the very first time at interval less than first threshold greater than second threshold value, then the Serving cell lagged value is set as second value.In step 520, if the signal measurement result of Serving cell continued for second time interval less than second threshold value, then the Serving cell lagged value is set as the 3rd value.In step 525, adjust the classification standard of Serving cell based on the Serving cell lagged value that is set as one of first value, second value and the 3rd value.
Fig. 6 is the flow chart of wireless communications method 600 of adjusting the classification standard of the neighbor cell be associated with WTRU.In step 605, carry out the signal measurement (for example RSRQ, RSCP, RSRP) of Serving cell.In step 610, if the signal measurement result of Serving cell exceeds first threshold, then the neighbor cell deviant is set as first value.In step 615, if the signal measurement result of Serving cell has continued the very first time at interval less than first threshold greater than second threshold value, then the neighbor cell deviant is set as second value.In step 620, if the signal measurement result of Serving cell continued for second time interval less than second threshold value, then the neighbor cell deviant is set as the 3rd value.In step 625, adjust the classification standard of neighbor cell based on the neighbor cell deviant that is set as one of first value, second value and the 3rd value.
Fig. 7 is the flow chart of wireless communications method 700 of adjusting the classification standard of the Serving cell be associated with WTRU.In step 705, the reselection timer among the WTRU is made as first value.In step 710, lagged value is made as second value.In step 715, the number of times of the sub-district gravity treatment that is associated with WTRU that takes place during the monitoring predetermined time cycle.In step 720, the mobility factor that monitoring is associated with WTRU.In step 725, if the number of times of sub-district gravity treatment exceeds the 3rd value and detects the high mobility factor, then determine to carry out by first of first reselection timer with first zoom factor on duty being adjusted, still being to carry out by second of the classification standard of second Serving cell with second zoom factor on duty of described lagged value being adjusted or first and second being adjusted boths and should be performed to reduce the grade of Serving cell.
Fig. 8 is a flow chart of adjusting the wireless communications method 800 of the reselection timer among the WTRU.In step 805, WTRU carries out the signal measurement (for example RSRQ, RSCP, RSRP) of Serving cell.In step 810, if the signal measurement result of Serving cell exceeds first threshold, then the reselection timer among the WTRU is set as first value.In step 815, if the signal measurement result of Serving cell has continued the very first time at interval less than first threshold greater than second threshold value, then described reselection timer is set as second value.In step 820, if the signal measurement result of Serving cell continued for second time interval less than second threshold value, then described reselection timer is set as the 3rd value.
Fig. 9 is the flow chart by the cell signal measurement report method 900 of WTRU execution.In step 905, carry out the Serving cell signal measurement.In step 910, carry out neighbor cell signal and measure.In step 915, in the time of on the neighbor cell signal measurement result increases to the reporting range threshold value, start TTT at interval.In step 920, if the Serving cell signal measurement is the result be reduced under the serving cell threshold, then adjust described TTT at interval and transmitted measurement report before described TTT expires at interval, this measurement report is used for Serving cell signal measurement result has been reduced to circulates a notice of and provides information about the neighbor cell that is used to generate switching command under the serving cell threshold.
Figure 10 is the flow chart by the cell signal measurement report method 1000 of WTRU execution.In step 1005, carry out the Serving cell signal measurement.In step 1010, carry out neighbor cell signal and measure.In step 1015, in the time of on the neighbor cell signal measurement result increases to the reporting range threshold value, start TTT at interval.In step 1020, if being reduced under the serving cell threshold and remaining under the described threshold value, Serving cell signal measurement result reaches predetermined time interval, then described TTT is adjusted at interval and measurement report was transmitted in TTT interim, and described measurement report is used for Serving cell signal measurement result has been reduced to circulates a notice of and provide information about the neighbor cell that is used to generate switching command under the serving cell threshold.
Although above-mentioned feature and element are described with specific combination, but each feature or element can be under the situation of other features that do not have described preferred implementation and element use separately, or with or with under the various situations that other features of the present utility model and element combine do not use.Method that the utility model provides or flow chart can be at the computer programs of being carried out by all-purpose computer or processor, implement in software or the firmware, wherein said computer program, software or firmware are to be included in the computer-readable recording medium in tangible mode, comprise read-only memory (ROM) about the example of computer-readable recording medium, random-access memory (ram), register, buffer storage, semiconductor memory apparatus, the magnetizing mediums of internal hard drive and removable dish and so on, the light medium of magnet-optical medium and CD-ROM video disc and digital versatile disc (DVD) and so on.
For instance, appropriate processor comprises: general processor, application specific processor, conventional processors, digital signal processor (DSP), a plurality of microprocessor, the one or more microprocessors that are associated with the DSP core, controller, microcontroller, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) circuit, any integrated circuit (IC) and/or state machine.
The processor that is associated with software can be used for realizing radio-frequency (RF) transceiver, to be used in wireless transmission receiving element (WTRU), subscriber equipment (UE), terminal, base station, radio network controller (RNC) or any host computer.WTRU can be used in combination with the module that adopts hardware and/or form of software to implement, for example camera, camara module, video circuit, speaker-phone, vibratory equipment, loud speaker, microphone, TV transceiver, Earphone with microphone, keyboard, indigo plant
Figure Y20082000894800241
Module, frequency modulation (FM) radio unit, LCD (LCD) display unit, Organic Light Emitting Diode (OLED) display unit, digital music player, media player, video game machine module, explorer and/or any wireless lan (wlan) or ultra broadband (UWB) module.

Claims (9)

1. a wireless transmitter/receiver unit is characterized in that, this wireless transmitter/receiver unit comprises:
Antenna;
Receiver is coupled in this antenna and is configured to received signal;
Processor is coupled in this receiver and is configured to:
The number of times of decision sub-district gravity treatment;
This number of times according to the sub-district gravity treatment decides the wireless transmitter/receiver unit mobility status;
The Serving cell lagged value carried out convergent-divergent by first value and respond and determine that this wireless transmitter/receiver unit mobility status is high, wherein this first value is stored in the memory of wireless transmitter/receiver unit; And
This Serving cell lagged value carried out convergent-divergent by second value and respond and determine that this wireless transmitter/receiver unit mobility status is medium, wherein this second value is stored in the memory of wireless transmitter/receiver unit.
2. wireless transmitter/receiver unit according to claim 1, it is characterized in that, described processor is also to be configured to if the predetermined value that the number of times of sub-district gravity treatment is lower than in the memory that is stored in wireless transmitter/receiver unit determines that then mobility status is a Hypomobility, and this Serving cell lagged value is not carried out the processor that convergent-divergent back and forth should the wireless transmitter/receiver unit mobility status be low this decision.
3. wireless transmitter/receiver unit according to claim 1, it is characterized in that, described processor is also to be configured to if the predetermined value that the number of times of sub-district gravity treatment is lower than in the memory that is stored in wireless transmitter/receiver unit determines that then mobility status is a Hypomobility, and by the 3rd value in the memory that is stored in wireless transmitter/receiver unit this Serving cell lagged value is carried out the processor that convergent-divergent back and forth should the wireless transmitter/receiver unit mobility status be low this decision.
4. wireless transmitter/receiver unit according to claim 1, it is characterized in that, described processor is also to be configured to according to by this first value or second value this Serving cell lagged value being carried out the classification standard that convergent-divergent is adjusted Serving cell, and the adjustment classification standard is stored in the processor in the memory of wireless transmitter/receiver unit.
5. wireless transmitter/receiver unit according to claim 2, it is characterized in that, described processor is also to be configured to adjust according to this Serving cell lagged value not being carried out convergent-divergent the classification standard of Serving cell, and the adjustment classification standard is stored in the processor in the memory of wireless transmitter/receiver unit.
6. wireless transmitter/receiver unit according to claim 3, it is characterized in that, described processor is also to be configured to according to by the 3rd value this Serving cell lagged value being carried out the classification standard that convergent-divergent is adjusted Serving cell, and the adjustment classification standard is stored in the processor in the memory of wireless transmitter/receiver unit.
7. wireless transmitter/receiver unit according to claim 1, it is characterized in that described processor is to be configured to also determine that this wireless transmitter/receiver unit mobility status is the high processor that definite number of times of determining the sub-district gravity treatment surpasses first pre-determined number of the sub-district gravity treatment in the memory that is stored in wireless transmitter/receiver unit of responding.
8. wireless transmitter/receiver unit according to claim 1, it is characterized in that described processor is to be configured to also determine that this wireless transmitter/receiver unit mobility status is that medium this number of times of responding definite at least sub-district gravity treatment does not have the processor above second pre-determined number of the sub-district gravity treatment in the memory that is stored in wireless transmitter/receiver unit.
9. wireless transmitter/receiver unit according to claim 1, it is characterized in that, described processor is to be configured to also determine that this wireless transmitter/receiver unit mobility status is that medium responding determines that this wireless transmitter/receiver unit has average ambulant processor, and wherein this average ambulant standard is stored in the memory of wireless transmitter/receiver unit.
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