CN105208664A - Scheduling method and apparatus for TDD D2D - Google Patents

Abstract

The present invention proposes a TDD? D2D scheduling method and device. The UE receives the first signaling in step 1, and the first signaling schedules the target carrier; in step 2, determines the first resource pool on the target carrier according to the X information bits in the first signaling; in step 3 Send the D2D signal on all or part of the resource blocks in the first resource pool. Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is TDD? One of UL/DL frame structures #0~6. The X changes with the URC of the target carrier, and the X is a positive integer. The scheme of the present invention can variably determine the number of bits according to the URC configuration of the scheduled target carrier, making full use of the load size of DCI format 0; when the number of uplink subframes is large, more bits are allocated to indicate D2D ? SA and D2D data for more flexible scheduling. In addition, the present invention has good compatibility.

Description

A scheduling method and device for TDD D2D

technical field

The present invention relates to a subframe scheduling scheme in a TDD (TimeDivisionDuplex, Time Division Duplex) frame structure, in particular to a subframe scheduling scheme based on an LTE (LongTermEvolution, long-term evolution) D2D (Device to Device, device-to-device) architecture.

Background technique

In the traditional 3GPP (3rd Generation Partner Project, third generation partnership project) LTE system, seven TDD UL/DL frame structures are defined, as shown in Table 1, where D represents the downlink subframe, U represents the uplink subframe, and S represents the special subframe frame:

Table 1: TDD LTE frame structure

In the LTE system, the base station sends DCI (Downlink Control Information, downlink control information) format 0 or 4 to schedule UE (User Equipment, user equipment) to send uplink data.

In a traditional 3GPP version, data transmission occurs between a base station and a UE (User Equipment, user equipment). In 3GPPR (Release, version) 12, D2D communication is established and discussed, and the essential feature of D2D is to allow data transmission between UEs. The conclusion reached by 3GPP at the RAN1 (RadioAccessNetworkWorkingGroup1, Radio Access Network Working Group 1) #77 meeting is that for UEs within the coverage of the cell, the base station sends DCI scheduling identified by D2DRNTI (RadioNetworkTemporaryIdentifier, wireless network tentative identification number) (that is, resource allocation) D2DSA (SchedulingAssignment, scheduling assignment) and D2D data, the payload size (that is, the number of information bits) of the DCI identified by the D2DRNTI is equal to the number of information bits in DCI format 0.

For uplink scheduling under TDD UL/DL frame structure #0 configuration, DCI format 0 includes two bits indicating ULI (UplinkIndex, uplink index) and does not include DAI (DownlinkAssignmentIndicator, downlink allocation indication); for TDD UL/DL frame structure #1 For uplink scheduling under ~6 configurations, DCI format 0 includes two bits indicating DAI but not ULI.

For the DCI identified by the D2DRNTI, a question to be discussed is how to determine the number of bits used for scheduling D2DSA and D2D data. The present invention provides a solution to the above-mentioned problems.

Contents of the invention

An intuitive idea is that ULI or DAI bits are reserved in the DCI identified by the D2DRNTI. The inventor found through research that reserving the DAI bit in the DCI identified by the D2DRNTI is helpful for assisting the UE in determining to send uplink ACK/NACK (acknowledgement/non-acknowledgement), while reserving the ULI bit in the DCI identified by the D2DRNTI does not have any meaning. In addition, considering that D2D communication can only occur in uplink subframes, and the number of uplink subframes configured in different TDD UL/DL frame structures is different, it may be necessary to schedule D2DSA and D2D data with different numbers of bits.

The present invention discloses a method for performing D2D communication in UE, which includes the following steps:

- Step A. Receive the first signaling, the first signaling schedules the target carrier

- Step B. Determine the first resource pool on the target carrier according to the X information bits in the first signaling

- Step C. Sending D2D signals on all or part of the resource blocks in the first resource pool

Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC (ULReferenceUL/DLConfiguration, uplink reference UL/DL frame structure) of the target carrier is one of TDD UL/DL frame structures #0-6. The X varies with the URC of the target carrier, and the X is a positive integer.

The URC is configured by system high layer signaling. If the receiving UE of the first signaling is only configured with one serving cell, the URC is indicated by the SIB (SystemInformationBlock, system information block) sent by the base station; if the receiving UE of the first signaling is configured with multiple serving cells, The URC is indicated by RRC (RadioResourceControl, radio resource management) signaling sent by the base station. For a detailed description of URC, refer to 3GPP specification TS36.213. . The X varies with the URC of the target carrier, that is, for the seven candidate configurations of the URC of the target carrier, the X has at least two different values. The first signaling explicitly or implicitly indicates the first resource pool. The first resource pool includes N resource blocks, where N is a positive integer. The resource block is a block of time-frequency resources that are continuous in the time domain and continuous in the frequency domain.

As an embodiment, the UE sends the D2D signal on all resource blocks in the first resource pool. As an embodiment, the UE sends the D2D signal on some resource blocks in the first resource pool according to its own requirements. As an embodiment, the resource block is a subframe in the time domain, and includes K PRBPs (PhysicalResourceBlockPair, physical resource block pair) in the frequency domain, where K is a positive integer. As an embodiment, the first signaling explicitly indicates a part of the first resource pool (for D2DSA), and the remaining part (for D2D data) is determined according to a mapping relationship with the indicated part. As an embodiment, the X information bits indicate a type of RPT (ResourcePatternofTransmission, resource pattern for transmission). As yet another embodiment, the X information bits indicate one or more subframes.

Specifically, according to an aspect of the present invention, it is characterized in that the D2D signal includes D2DSA and D2D data, and the D2DSA indicates the time-frequency resource occupied by the D2D data.

Specifically, according to an aspect of the present invention, it is characterized in that the first resource pool is located in an uplink subframe in the time domain.

Specifically, according to one aspect of the present invention, it is characterized in that if the URC of the target carrier is TDD UL/DL frame structure #0, the X is X1; if the URC of the target carrier is TDD UL/DL frame structure # Any one of 1 to 5, the X is X2; if the URC of the target carrier is TDD UL/DL frame structure #6, the X is X1 or X2. The X1 is greater than the X2 by 2.

As an example, if the URC of the target carrier is TDD UL/DL frame structure #6, the X is X2, that is, if the URC of the target carrier is any one of TDD UL/DL frame structures #1-6 , said X is said X2.

Specifically, according to an aspect of the present invention, it is characterized in that when the X is the X1, the first signaling has fewer DAI bits than when the X is the X2.

As an embodiment, compared with the first signaling when the URC of the target carrier is one of TDD UL/DL frame structures #1-6, when the URC of the target carrier is TDD UL/DL frame structure #0 The meanings of other bits in the first signaling except {DAI bit, the X information bits} are exactly the same.

The invention discloses a method for scheduling D2D communication in a base station, which includes the following steps:

- Step A. Determining the first resource pool on the target carrier

- Step B. Send the first signaling, the first signaling schedules the target carrier, and the X information bits in the first signaling are related to the first resource pool

Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is one of TDD UL/DL frame structures #0-6. The X varies with the URC of the target carrier, and the X is a positive integer.

The X varies with the URC of the target carrier, that is, for the seven candidate configurations of the URC of the target carrier, the X has at least two different values. The first signaling explicitly or implicitly indicates the first resource pool. As an embodiment, the X information bits indicate various RPTs. The step A is performed by the base station itself according to parameters such as current traffic volume. The first resource pool correlation means that the receiving UE of the first signaling can determine the first resource pool according to the X information bits.

Specifically, according to one aspect of the present invention, it is characterized in that the first resource pool is used to transmit D2D signals, the D2D signals include D2DSA and D2D data, and the D2DSA indicates time-frequency resources occupied by the D2D data.

Specifically, according to an aspect of the present invention, it is characterized in that the first resource pool is located in an uplink subframe in the time domain.

Specifically, according to one aspect of the present invention, it is characterized in that if the URC of the target carrier is TDD UL/DL frame structure #0, the X is X1; if the URC of the target carrier is TDD UL/DL frame structure # Any one of 1 to 5, the X is X2; if the URC of the target carrier is TDD UL/DL frame structure #6, the X is X1 or X2. The X1 is greater than the X2 by 2.

Specifically, according to the above aspect of the present invention, it is characterized in that when the X is the X1, the first signaling has fewer DAI bits than when the X is the X2.

The invention discloses a user equipment, which is characterized in that the equipment includes:

The first module: used to receive the first signaling, the first signaling schedules the target carrier

The second module: used to determine the first resource pool on the target carrier according to X information bits in the first signaling

The third module: for sending D2D signals on all or part of the resource blocks in the first resource pool

Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is one of TDD UL/DL frame structures #0-6. The X varies with the URC of the target carrier, and the X is a positive integer. If the URC of the target carrier is TDD UL/DL frame structure #0, the X is X1; if the URC of the target carrier is any one of TDD UL/DL frame structures #1-5, the X is X2 ; If the URC of the target carrier is TDD UL/DL frame structure #6, the X is X1 or X2. The X1 is greater than the X2 by 2.

As an embodiment, the above device is characterized in that, when the X is the X1, the first signaling has fewer DAI bits than when the X is the X2.

The invention discloses a base station device, which is characterized in that the device includes:

- Step A. Determining the first resource pool on the target carrier

- Step B. Send the first signaling, the first signaling schedules the target carrier, and the X information bits in the first signaling are related to the first resource pool

Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is one of TDD UL/DL frame structures #0-6. The X varies with the URC of the target carrier, and the X is a positive integer. If the URC of the target carrier is TDD UL/DL frame structure #0, the X is X1; if the URC of the target carrier is any one of TDD UL/DL frame structures #1-5, the X is X2 ; If the URC of the target carrier is TDD UL/DL frame structure #6, the X is X1 or X2. The X1 is greater than the X2 by 2.

As an embodiment, the above device is characterized in that, when the X is the X1, the first signaling has fewer DAI bits than when the X is the X2.

Aiming at the problem of setting the number of bits used to schedule D2DSA and D2D data in the DCI marked by D2DRNTI, the solution of the present invention can determine the number of bits variably according to the configuration of the URC of the scheduled target carrier, making full use of the DCI format 0 payload size; when the number of uplink subframes is large, more bits are allocated to indicate D2DSA and D2D data to achieve more flexible scheduling. Furthermore, the present invention is fully compatible with existing conference conclusions.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 shows a flowchart of D2D scheduling according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of information bits vs. fields of the first signaling according to an embodiment of the present invention;

Fig. 3 shows a structural block diagram of a processing device in a user equipment according to an embodiment of the present invention;

Fig. 4 shows a structural block diagram of a processing device in a base station device according to an embodiment of the present invention;

Detailed ways

The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined arbitrarily.

Example 1

Embodiment 1 illustrates the flowchart of D2D scheduling, as shown in FIG. 1 . In FIG. 1 , base station N1 is a serving base station of UEU2, UEU2 is a D2D sending UE, and UEU3 is a corresponding D2D receiving UE.

For the base station N1, determine the first resource pool on the target carrier in step S11; send the first signaling in step S12, the first signaling schedules the target carrier, and the X information bits in the first signaling are the first A resource pool is associated.

For UEU2, the first signaling is received in step S21, and the first signaling schedules the target carrier; in step S22, the first resource pool on the target carrier is determined according to the X information bits in the first signaling; in step In S23, the D2D signal is sent on all or part of the resource blocks in the first resource pool.

In Embodiment 1, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is one of TDD UL/DL frame structures #0-6. For the seven candidate configurations of the URC of the target carrier, the X has at least two different values. Said X is a positive integer.

As a sub-embodiment 1 of the embodiment, the first resource pool is located in an uplink subframe in the time domain, the D2D signal includes D2DSA and D2D data, and the D2DSA indicates the time-frequency resource occupied by the D2D data.

As a sub-embodiment 2 of the embodiment, if the URC of the target carrier is TDD UL/DL frame structure #0, the X is X1; if the URC of the target carrier is TDD UL/DL frame structure #1-5 In any one, the X is X2; if the URC of the target carrier is TDD UL/DL frame structure #6, the X is X1 or X2. The X1 is equal to the X2 plus 2.

As a sub-embodiment 3 of the embodiment, the first resource pool includes two parts—a second resource pool for transmitting D2DSA and a third resource pool for transmitting D2D data. The X information bits only indicate one part (for example, the second resource pool), and the third resource pool is determined according to the mapping relationship between the third resource pool and the second resource pool.

As a sub-embodiment 4 of the embodiment, the X information bits indicate the following information:

- Subframes occupied by the time domain

- PRB pairs occupied in the frequency domain

- Inter-subframe (Inter-subframe) frequency hopping information.

Example 2

Embodiment 2 illustrates a schematic diagram of information bits vs. fields of the first signaling, as shown in FIG. 2 . Figure 2 does not include padding bits in the first signaling (in order to maintain the same load size as DCI format 1A), CRC (CyclicRedundancyCheck, cyclic redundancy check) bits, and possible CIF (CarrierIndicatorField, carrier indicator field ) bits.

For the base station, first determine the first resource pool on the target carrier; then send the first signaling, and the first signaling schedules the target carrier.

For the UE, firstly receive the first signaling, the first signaling schedules the target carrier; then determine the first resource pool on the target carrier according to the X information bits in the first signaling; then the first resource pool in the first resource pool The D2D signal is sent on all or part of the resource blocks.

In Embodiment 2, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is one of TDD UL/DL frame structures #0-6. The X information bits in the first signaling are related to the first resource pool. For the seven candidate configurations of the URC of the target carrier, the X has at least two different values. Said X is a positive integer.

According to the load size of DCI format 0, the load size of the first signaling is (the system bandwidth of the target carrier in brackets): {22 (1.4MHz), 24 (3MHz), 24 (5MHz), 29 (10MHz) , 30(15MHz), 31(20MHz)}.

If the URC of the target carrier is TDD UL/DL frame structure #0, DAI and ULI are not included in the first signaling, and the X is (system bandwidth of the target carrier in brackets): {8+T(1.4 MHz), 10+T(3MHz), 10+T(5MHz), 15+T(10MHz), 16+T(15MHz), 17+T(20MHz)};

If the URC of the target carrier is one of TDD UL/DL frame structures #1-6, the first signaling includes DAI but not ULI, and the X is (the system bandwidth of the target carrier in brackets) : {6+T(1.4MHz), 8+T(3MHz), 8+T(5MHz), 13+T(10MHz), 14+T(15MHz), 15+T(20MHz)}.

The T is a positive integer not greater than 14.

As a sub-embodiment 1 of Embodiment 2, the T is 7, and the X information bits indicate the following information:

- Subframes occupied by the time domain

- PRB pairs occupied in the frequency domain

- frequency hopping information.

Example 3

Embodiment 3 illustrates a structural block diagram of a processing device in a user equipment, as shown in FIG. 3 . In FIG. 3 , the processing device 300 is composed of a receiving module 301 , a determining module 302 , and a sending module 303 .

The receiving module 301 is used to receive the first signaling, and the first signaling schedules the target carrier; the determining module 302 is used to determine the first resource pool on the target carrier according to the X information bits in the first signaling; the sending module 303 It is used for sending D2D signals on all or part of resource blocks in the first resource pool.

In Embodiment 3, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is one of TDD UL/DL frame structures #0-6. The X varies with the URC of the target carrier, and the X is a positive integer. If the URC of the target carrier is TDD UL/DL frame structure #0, the X is X1; if the URC of the target carrier is any one of TDD UL/DL frame structures #1-5, the X is X2 ; If the URC of the target carrier is TDD UL/DL frame structure #6, the X is X1 or X2. The X1 is greater than the X2 by 2. When the X is the X1, DAI bits are reduced in the first signaling compared with when the X is the X2

As a sub-embodiment, if the URC of the target carrier is TDD UL/DL frame structure #6, the X is X2.

As yet another sub-embodiment, if the URC of the target carrier is TDD UL/DL frame structure #6, the X is X1.

Example 4

Embodiment 4 illustrates a structural block diagram of a processing device in a base station device, as shown in FIG. 4 . In FIG. 4 , the processing device 400 is composed of a determining module 401 and a sending module 402 .

- Step A. Determining the first resource pool on the target carrier

- Step B. Send the first signaling, the first signaling schedules the target carrier, and the X information bits in the first signaling are related to the first resource pool

Wherein, the first signaling is physical layer signaling, and the DCI payload size of the first signaling is equal to the payload size of DCI format 0 for scheduling the target carrier. The URC of the target carrier is one of TDD UL/DL frame structures #0-6. The X varies with the URC of the target carrier, and the X is a positive integer. If the URC of the target carrier is TDD UL/DL frame structure #0, the X is X1; if the URC of the target carrier is any one of TDD UL/DL frame structures #1-6, the X is X2 . The X1 is greater than the X2 by 2. When the X is the X1, DAI bits are reduced in the first signaling compared with when the X is the X2.

As a sub-embodiment, the first resource pool is used to transmit a D2D signal, where the D2D signal includes D2DSA and D2D data, and the D2DSA indicates a time-frequency resource occupied by the D2D data.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module unit in the above-mentioned embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules, and the present application is not limited to any specific combination of software and hardware.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the 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.