CN105208664A - Scheduling method and apparatus for TDD D2D - Google Patents
Scheduling method and apparatus for TDD D2D Download PDFInfo
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Abstract
The invention provides a scheduling method and an apparatus for TDD D2D. The method includes: step 1, UE receives a first signaling, and the first signaling schedules a target carrier wave; step 2, a first resource pool of the target carrier wave is determined according to X information bits in the first signaling; step 3, D2D signals are sent to all or part of resource blocks in the first resource pool; wherein the first signaling is a physical layer signaling, the DCI load dimension of the first signaling is equal to the load dimension of DCI format 0 of the scheduled target carrier, the URC of the target carrier wave is one of TDD UL/DL frame structures #0-6, the X changes with the URC of the target carrier wave, and the X is a positive integer. According to the scheme, the bit number can be determined in a variable manner according to the configuration of the URC of the scheduled target carrier wave, and the load dimension of the DCI format 0 is fully used; when the number of uplink subframes is more, more bits used for indicating D2D SA and D2D data are assigned so that the scheduling is more flexible; besides, the compatibility is good.
Description
Technical field
The present invention relates to TDD (TimeDivisionDuplex, time division duplex) subframe scheduling scheme in frame structure, particularly relate to based on LTE (LongTermEvolution, Long Term Evolution) the subframe scheduling scheme of D2D (DevicetoDevice, device is to device) framework.
Background technology
In traditional 3GPP (3rdGenerationPartnerProject, third generation partner program) LTE system, define seven kinds of TDDUL/DL frame structures, as shown in table 1, wherein D represents descending sub frame, and U represents sub-frame of uplink, and S is special subframe:
Table 1:TDDLTE frame structure
In LTE system, base station sends DCI (DownlinkControlInformation, Downlink Control Information) form 0 or 4 scheduling UE (UserEquipment, subscriber equipment) and sends upstream data.
In traditional 3GPP version, transfer of data occurs between base station and UE (UserEquipment, subscriber equipment).In 3GPPR (Release, version) 12, D2D communication is also discussed by project verification, and the essential characteristic of D2D allows the transfer of data between UE.3GPP is at RAN1 (RadioAccessNetworkWorkingGroup1, wireless access network first working group) conclusion reached of #77 meeting is: for the UE be in MPS process, base station sends by D2DRNTI (RadioNetworkTemporaryIdentifier, wireless network fixes tentatively identifier) DCI that identifies dispatches (i.e. Resources allocation) D2DSA (SchedulingAssignment, dispatching distribution) and D2D data, the payload size (i.e. information bit) of the DCI of described D2DRNTI mark equals the information bit of DCI format 0.
Uplink scheduling under TDDUL/DL frame structure #0 is configured, DCI format 0 comprises two bit instruction ULI (UplinkIndex, upper line index) and do not comprise DAI (DownlinkAssignmentIndicator, descending distribution instruction); For the uplink scheduling under the configuration of TDDUL/DL frame structure #1 ~ 6, DCI format 0 comprises two bit instruction DAI and does not comprise ULI.
For the DCI that described D2DRNTI identifies, a problem to be discussed how to determine wherein for dispatching the bit number of D2DSA and D2D data.The present invention is directed to the problems referred to above and provide solution.
Summary of the invention
One intuitively idea be described D2DRNTI identify DCI in retain ULI or DAI bit.Inventor is found by research, retains DAI bit and is conducive to auxiliary UE and determines to send uplink ACK/NACK (response/non-response), and retain ULI really without any meaning in the DCI of described D2DRNTI mark in the DCI of described D2DRNTI mark.In addition, consider that D2D communication can only occur in sub-frame of uplink, and the sub-frame of uplink number configured in different TDDUL/DL frame structures is different, therefore may need different bit number scheduling D2DSA and D2D data.
The invention discloses a kind of method of carrying out D2D communication in UE, wherein, comprise the steps:
-steps A. receive the first signaling, the first signaling scheduling target carrier
-step B. determines the first resource pond in described target carrier according to the information bit of the X in the first signaling
The all or part of Resource Block of-step C. in first resource pond sends D2D signal
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC (ULReferenceUL/DLConfiguration, up with reference to UL/DL frame structure) of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.
Described URC is by high system level signal deployment.If the reception UE of the first signaling is only configured a Serving cell, SIB (SystemInformationBlock, the system information block) instruction that described URC is sent by described base station; If the reception UE of the first signaling has been configured multiple Serving cell, RRC (RadioResourceControl, RRM) the signaling instruction that described URC is sent by described base station.About the detailed description reference 3GPP specification TS36.213 of URC.。Namely described X changes along with the URC of described target carrier: for 7 kinds of candidate's configurations of the URC of described target carrier, described X at least exists two kinds of different values.The instruction first resource pond of the explicit or implicit expression of the first signaling.First resource pond comprises N number of Resource Block, and described N is positive integer.Described Resource Block is by continuous print one piece of running time-frequency resource continuously and on frequency domain in time domain.
As an embodiment, the whole Resource Block of described UE in first resource pond send D2D signal.As an embodiment, described UE sends D2D signal according on the part resource block of the demand of oneself in first resource pond.As an embodiment, described Resource Block is a subframe in time domain, and frequency domain comprises K PRBP (PhysicalResourceBlockPair, Physical Resource Block to), and described K is positive integer.As an embodiment, the part (for D2DSA) in the first signaling explicit instruction first resource pond, remainder (for D2D data) then basis is determined with the mapping relations of the part be instructed to.As an embodiment, a described X information bit indicates a kind of RPT (ResourcePatternofTransmission sends resource map).As another embodiment, a described X information bit indicates one or more subframe.
Concrete, according to an aspect of the present invention, it is characterized in that, described D2D signal comprises D2DSA and D2D data, the running time-frequency resource that described D2DSA indicates described D2D data to take.
Concrete, according to an aspect of the present invention, it is characterized in that, first resource pond is positioned at sub-frame of uplink in time domain.
Concrete, according to an aspect of the present invention, it is characterized in that, if the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
As an embodiment, if the URC of described target carrier is TDDUL/DL frame structure #6, described X is X2, if namely the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 6, described X is described X2.
Concrete, according to an aspect of the present invention, it is characterized in that, when described X is described X1, compares when the first signaling is described X2 with described X and decrease DAI bit.
As an embodiment, the first signaling when being a kind of in TDDUL/DL frame structure #1 ~ 6 with the URC of described target carrier is compared, the implication of other bits in the first signaling when the URC of described target carrier is TDDUL/DL frame structure #0 outside { DAI bit, a described X information bit } is identical.
The invention discloses in a kind of base station the method for dispatching D2D communication, wherein, comprise the steps:
-steps A. determine the first resource pond in target carrier
-step B. sends the first signaling, target carrier described in the first signaling scheduling, and X information bit in the first signaling is correlated with in first resource pond
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.
Namely described X changes along with the URC of described target carrier: for 7 kinds of candidate's configurations of the URC of described target carrier, described X at least exists two kinds of different values.The instruction first resource pond of the explicit or implicit expression of the first signaling.As an embodiment, a described X information bit indicates multiple RPT.Described steps A is that described base station performs voluntarily according to parameters such as current traffic.The reception UE referring to the first signaling is correlated with in described first resource pond can according to described X information bit determination first resource pond.
Concrete, according to an aspect of the present invention, it is characterized in that, first resource pond is for transmitting D2D signal, and described D2D signal comprises D2DSA and D2D data, the running time-frequency resource that described D2DSA indicates described D2D data to take.
Concrete, according to an aspect of the present invention, it is characterized in that, first resource pond is positioned at sub-frame of uplink in time domain.
Concrete, according to an aspect of the present invention, it is characterized in that, if the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
Concrete, according to above-mentioned aspect of the present invention, it is characterized in that, when described X is described X1, compares when the first signaling is described X2 with described X and decrease DAI bit.
The invention discloses a kind of subscriber equipment, it is characterized in that, this equipment comprises:
First module: for receiving the first signaling, the first signaling scheduling target carrier
Second module: for determining the first resource pond in described target carrier according to the information bit of the X in the first signaling
3rd module: send D2D signal on all or part of Resource Block in first resource pond
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.If the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
As an embodiment, the feature of the said equipment is, when described X is described X1, compares and decrease DAI bit when the first signaling is described X2 with described X.
The invention discloses a kind of base station equipment, it is characterized in that, this equipment comprises:
-steps A. determine the first resource pond in target carrier
-step B. sends the first signaling, target carrier described in the first signaling scheduling, and X information bit in the first signaling is correlated with in first resource pond
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.If the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
As an embodiment, the feature of the said equipment is, when described X is described X1, compares and decrease DAI bit when the first signaling is described X2 with described X.
In DCI for D2DRNTI mark, this problem is set for the bit number dispatching D2DSA and D2D data, the solution of the present invention can according to the variable determination of the configuration of the URC of the target carrier be scheduled bit number, take full advantage of the payload size of DCI format 0; Distribute more bit when sub-frame of uplink quantity is more and be used to indicate D2DSA and D2D data, realize dispatching more flexibly.In addition, the present invention and existing meeting conclusion completely compatible.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more apparent:
Fig. 1 shows the flow chart that D2D according to an embodiment of the invention dispatches;
Fig. 2 shows the schematic diagram in the information bit vs. territory of the first signaling according to an embodiment of the invention;
Fig. 3 shows the structured flowchart of the processing unit in subscriber equipment according to an embodiment of the invention;
Fig. 4 shows the structured flowchart of the processing unit in base station equipment according to an embodiment of the invention;
Embodiment
Hereafter will be described in further detail technical scheme of the present invention by reference to the accompanying drawings, and it should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine arbitrarily mutually.
Embodiment 1
Embodiment 1 illustrates the flow chart of D2D scheduling, as shown in Figure 1.In accompanying drawing 1, base station N1 is the serving BS of UEU2, and UEU2 is D2D transmission UE, UEU3 is that corresponding D2D receives UE.
For base station N1, determine the first resource pond in target carrier in step s 11; Send the first signaling in step s 12, target carrier described in the first signaling scheduling, X information bit in the first signaling is correlated with in first resource pond.
For UEU2, receive the first signaling in the step s 21, the first signaling scheduling target carrier; Determine the first resource pond in described target carrier according to the information bit of the X in the first signaling in step S22; In step S23, all or part of Resource Block in first resource pond sends D2D signal.
In embodiment 1, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.For 7 kinds of candidate's configurations of the URC of described target carrier, at least there are two kinds of different values in described X.Described X is positive integer.
As the sub-embodiment 1 of embodiment, first resource pond is positioned at sub-frame of uplink in time domain, and described D2D signal comprises D2DSA and D2D data, the running time-frequency resource that described D2DSA indicates described D2D data to take.
As the sub-embodiment 2 of embodiment, if the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 equals described X2 and adds 2.
As the sub-embodiment 3 of embodiment, first resource pond comprises two parts-for transmitting the Secondary resource pond of D2DSA and the information resources pond for transmitting D2D data.A described X information bit only indicates one of them part (such as Secondary resource pond), according to the mapping relations determination information resources pond in information resources pond and Secondary resource pond.
As the sub-embodiment 4 of embodiment, a described X information bit indicates following information:
The subframe that-time domain takies
The PRB couple that-frequency domain takies
(Inter-subframe) tone hopping information between-subframe.
Embodiment 2
Embodiment 2 illustrates the schematic diagram in the information bit vs. territory of the first signaling, as shown in Figure 2.The filling bit (in order to keep, with DCI format 1A, there is identical payload size) in the first signaling is not comprised in accompanying drawing 2, CRC (CyclicRedundancyCheck, cyclic redundancy check (CRC)) bit, and possible CIF (CarrierIndicatorField, carrier wave instructions field) bit.
For base station, first determine the first resource pond in target carrier; Then the first signaling is sent, target carrier described in the first signaling scheduling.
For UE, first receive the first signaling, the first signaling scheduling target carrier; Then the first resource pond in described target carrier is determined according to the information bit of the X in the first signaling; Then all or part of Resource Block in first resource pond sends D2D signal.
In embodiment 2, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.X information bit in first signaling is correlated with in first resource pond.For 7 kinds of candidate's configurations of the URC of described target carrier, at least there are two kinds of different values in described X.Described X is positive integer.
According to the payload size of DCI format 0, the payload size of the first signaling is (system bandwidth in bracket being described target carrier): { 22 (1.4MHz), 24 (3MHz), 24 (5MHz), 29 (10MHz), 30 (15MHz), 31 (20MHz) }.
If the URC of described target carrier is TDDUL/DL frame structure #0, DAI and ULI is not comprised in first signaling, described X is (system bandwidth being described target carrier) in bracket: { 8+T (1.4MHz), 10+T (3MHz), 10+T (5MHz), 15+T (10MHz), 16+T (15MHz), 17+T (20MHz) };
If the URC of described target carrier is the one in TDDUL/DL frame structure #1 ~ 6, first signaling comprises DAI and does not comprise ULI, described X is (system bandwidth being described target carrier) in bracket: { 6+T (1.4MHz), 8+T (3MHz), 8+T (5MHz), 13+T (10MHz), 14+T (15MHz), 15+T (20MHz) }.
Described T be not more than 14 positive integer.
As the sub-embodiment 1 of embodiment 2, described T is 7, and a described X information bit indicates following information:
The subframe that-time domain takies
The PRB couple that-frequency domain takies
-tone hopping information.
Embodiment 3
Embodiment 3 illustrates the structured flowchart of the processing unit in subscriber equipment, as shown in Figure 3.In accompanying drawing 3, processing unit 300 by receiver module 301, determination module 302, and sending module 303 forms.
Receiver module 301 for receiving the first signaling, the first signaling scheduling target carrier; Determination module 302 is for determining the first resource pond in described target carrier according to the information bit of the X in the first signaling; Sending module 303 sends D2D signal on all or part of Resource Block in first resource pond.
In embodiment 3, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.If the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.When described X is described X1, compares when the first signaling is described X2 with described X and decrease DAI bit
As a sub-embodiment, if the URC of described target carrier is TDDUL/DL frame structure #6, described X is X2.
As another sub-embodiment, if the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1.
Embodiment 4
Embodiment 4 illustrates the structured flowchart of the processing unit in base station equipment, as shown in Figure 4.In accompanying drawing 4, processing unit 400 is made up of determination module 401 and sending module 402.
-steps A. determine the first resource pond in target carrier
-step B. sends the first signaling, target carrier described in the first signaling scheduling, and X information bit in the first signaling is correlated with in first resource pond
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.If the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 6, described X is X2.Described X1 larger than described X2 2.When described X is described X1, compares when the first signaling is described X2 with described X and decrease DAI bit.
As a sub-embodiment, first resource pond is for transmitting D2D signal, and described D2D signal comprises D2DSA and D2D data, the running time-frequency resource that described D2DSA indicates described D2D data to take.
The all or part of step that one of ordinary skill in the art will appreciate that in said method can be carried out instruction related hardware by program and complete, and described program can be stored in computer-readable recording medium, as read-only memory, and hard disk or CD etc.Optionally, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Accordingly, each modular unit in above-described embodiment, can adopt example, in hardware to realize, and also can be realized by the form of software function module, the application is not limited to the combination of the software and hardware of any particular form.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improves, all should be included within protection scope of the present invention.
Claims (14)
1. carry out a method for D2D communication in UE, wherein, comprise the steps:
-steps A. receive the first signaling, the first signaling scheduling target carrier
-step B. determines the first resource pond in described target carrier according to the information bit of the X in the first signaling
The all or part of Resource Block of-step C. in first resource pond sends D2D signal
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.
2. method according to claim 1, is characterized in that, described D2D signal comprises D2DSA and D2D data, the running time-frequency resource that described D2DSA indicates described D2D data to take.
3. method according to claim 1, is characterized in that, first resource pond is positioned at sub-frame of uplink in time domain.
4. the method according to claim 1-3, is characterized in that, if the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
5. method according to claim 4, is characterized in that, when described X is described X1, compares and decrease DAI bit when the first signaling is described X2 with described X.
6. dispatch a method for D2D communication in base station, wherein, comprise the steps:
-steps A. determine the first resource pond in target carrier
-step B. sends the first signaling, target carrier described in the first signaling scheduling, and X information bit in the first signaling is correlated with in first resource pond
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.
7. method according to claim 6, is characterized in that, first resource pond is for transmitting D2D signal, and described D2D signal comprises D2DSA and D2D data, the running time-frequency resource that described D2DSA indicates described D2D data to take.
8. method according to claim 6, is characterized in that, first resource pond is positioned at sub-frame of uplink in time domain.
9. the method according to claim 6-8, is characterized in that, if the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
10. method according to claim 9, is characterized in that, when described X is described X1, compares and decrease DAI bit when the first signaling is described X2 with described X.
11. 1 kinds of subscriber equipmenies, is characterized in that, this equipment comprises:
First module: for receiving the first signaling, the first signaling scheduling target carrier
Second module: for determining the first resource pond in described target carrier according to the information bit of the X in the first signaling
3rd module: send D2D signal on all or part of Resource Block in first resource pond
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.If the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
12. equipment according to claim 11, is characterized in that, when described X is described X1, compares and decrease DAI bit when the first signaling is described X2 with described X.
13. 1 kinds of base station equipments, is characterized in that, this equipment comprises:
-steps A. determine the first resource pond in target carrier
-step B. sends the first signaling, target carrier described in the first signaling scheduling, and X information bit in the first signaling is correlated with in first resource pond
Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling equals the payload size of the DCI format 0 of execution cost target carrier.The URC of described target carrier is the one in TDDUL/DL frame structure #0 ~ 6.Described X changes along with the URC of described target carrier, and described X is positive integer.If the URC of described target carrier is TDDUL/DL frame structure #0, described X is X1; If the URC of described target carrier is any one in TDDUL/DL frame structure #1 ~ 5, described X is X2; If the URC of described target carrier is TDDUL/DL frame structure #6, described X is X1 or X2.Described X1 larger than described X2 2.
14. equipment according to claim 13, is characterized in that, when described X is described X1, compares and decrease DAI bit when the first signaling is described X2 with described X.
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| WO2019084924A1 (en) * | 2017-11-03 | 2019-05-09 | Oppo广东移动通信有限公司 | Data transmission method and device |
| CN110430619A (en) * | 2016-03-10 | 2019-11-08 | 上海朗帛通信技术有限公司 | A kind of method and apparatus of the narrow band communication based on Cellular Networks |
| WO2020192516A1 (en) * | 2019-03-28 | 2020-10-01 | 维沃移动通信有限公司 | Downlink assignment index determination method, terminal, and network device |
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| CN112399578B (en) * | 2019-08-16 | 2022-12-06 | 上海朗帛通信技术有限公司 | Method and apparatus in a node used for wireless communication |
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