WO2014179989A1

WO2014179989A1 - Method and device for supporting device-to-device (d2d) communication in wireless communications system

Info

Publication number: WO2014179989A1
Application number: PCT/CN2013/075484
Authority: WO
Inventors: 孟艳; 郑武; 刘铮; 蒋琦; 倪威; 沈钢
Original assignee: 上海贝尔股份有限公司
Priority date: 2013-05-10
Filing date: 2013-05-10
Publication date: 2014-11-13
Also published as: CN105144813A; CN105144813B

Abstract

The present invention provides a method for supporting device-to-device (D2D) communication in a wireless communications system. The method comprises: receiving, from a first user equipment, a resource request message for D2D communication; and responding to the resource request message, separately sending a first physical downlink control channel and a second physical downlink control channel to the first user equipment and a second user equipment, and proving signaling for indicating a sender and a receiver of the D2D communication.

Description

Method and apparatus for supporting device-to-device D2D communication in a wireless communication system

Embodiments of the present invention relate to the field of wireless communications and, more particularly, to a method and apparatus for supporting device-to-device communication in a wireless communication system. Background technique

The idea of device-to-device (D2D) communication has been proposed in recent years. D2D communication is a short-distance service that is different from the conventional cellular communication mode. For a conventional cellular communication system, communication between user equipments (UEs) is performed by the UE-eNodeB-UE even when they are in close proximity to each other. In order to conserve cellular resources and reduce communication delays in the case where the aforementioned communicating parties are very close to each other, a cellular controlled D2D communication system is introduced as a potential short-range technology for LTE-A. Now 3GPP has launched a new research project to develop standards related to D2D technology for neighboring services.

For conventional cellular communication, communication between UEs should be performed only through the UE-eNodeB-UE through the uplink and downlink resources allocated by the base station eNodeB (hereinafter referred to as eNB). In D2D communication, two UEs can directly transmit data to each other in the uplink or downlink, while time-frequency resources are still allocated by the eNB. Given the different characteristics of cellular communications and D2D communications, it is necessary to introduce an efficient transmission method that is applicable to D2D communications under cellular infrastructure while maintaining (backward) compatibility as much as possible. However, there is no method in the prior art for addressing efficient transmission for D2D communication in a cellular infrastructure. Summary of the invention

In order to solve the above problems existing in the prior art, the present specification proposes the following scheme. According to an aspect of the present invention, a method for supporting device-to-device D2D communication in a wireless communication system is provided, comprising: receiving a resource request message for D2D communication from a first user equipment; and responding to the resource request a message, sending, to the first user equipment and the second user equipment, a first physical downlink control channel and a second object, respectively A downlink control channel is provided, and signaling for indicating a sender and a receiver of the D2D communication is provided.

In an optional implementation of the invention, the transmitting of the first physical downlink control channel and the second physical downlink control channel is performed in the same subframe.

In an optional implementation of the invention, the first physical downlink control channel is the same as the second physical downlink control channel.

In an optional implementation of the present invention, the multiple user equipments in the wireless communication system are divided into one or more groups, and the first user equipment and the second user equipment are in the same group, and The method further includes: transmitting the first physical downlink control channel to all other user equipments in the same group as the first user equipment and the second user equipment.

In an optional implementation of the present invention, the signaling is provided in one of: downlink control information DCI in the first physical downlink control channel and the second physical downlink control channel, Subframe, frequency, and antenna port.

According to another aspect of the present invention, an apparatus for supporting device-to-device D2D communication in a wireless communication system is provided, comprising: receiving means for receiving a resource request message for D2D communication from a first user equipment; a first sending device, configured to send, to the first user equipment and the second user equipment, a first physical downlink control channel and a second physical downlink control channel, respectively, in response to the resource request message, and provide Signaling indicating the sender and receiver of the D2D communication.

In an optional implementation of the present invention, the multiple user equipments in the wireless communication system are divided into one or more groups, and the first user equipment and the second user equipment are in the same group, and The device further includes: a second sending device, configured to send the first PDCCH to all other user equipments in the same group as the first user equipment and the second user equipment, and provide Signaling of the sender and receiver of D2D communication. In an optional implementation of the present invention, the signaling is provided in one of: downlink control information DCI in the first physical downlink control channel and the second physical downlink control channel, Subframe, frequency, and antenna port.

In another implementation of the present invention, a method for supporting device-to-device D2D communication in a wireless communication system is provided, comprising: transmitting a resource request message for D2D communication to a base station; receiving a physical downlink from the base station a control channel, and signaling for indicating a sender and a receiver of the D2D communication; decoding the physical downlink control channel by a corresponding wireless network temporary identifier RNTI; and decoding the physical downlink The information in the control channel and the signaling are performed by the D2D communication with one or more user equipments.

In an optional implementation of the invention, the signaling is provided in one of: downlink control information DCI, subframes, frequencies, and antenna ports in the physical downlink control channel.

In an optional implementation of the invention, the D2D communication with one or more user equipments includes one of unicast, multicast, and broadcast.

According to another implementation of the present invention, an apparatus for supporting device-to-device D2D communication in a wireless communication system is provided, including: a transmitting apparatus, configured to send a resource request message for D2D to a base station; Receiving, by the base station, a physical downlink control channel, and signaling for indicating a sender and a receiver of the D2D communication; and decoding means, configured to temporarily decode the physical downlink by using a corresponding wireless network temporary identifier RNTI And a communication device, configured to perform the D2D communication with one or more user equipments based on the decoded information in the physical downlink control channel and the signaling.

In an optional implementation of the invention, the D2D communication with one or more user equipments includes one of unicast, multicast, and broadcast. DRAWINGS

The above detailed description of the embodiments of the present invention is read by referring to the accompanying drawings. Other objects, features, and advantages will become apparent. In the figures, several embodiments of the invention are illustrated by way of illustration and not limitation

Figure 1 shows a schematic diagram 100 of D2D communication under a cellular system in a single cell scenario;

Figure 2 shows a transmission process 200 of cellular communication;

FIG. 3 illustrates a transmission process 300 for D2D communication in accordance with an embodiment of the present invention;

4 illustrates another transmission process 400 for D2D communication in accordance with an embodiment of the present invention;

Figure 5 illustrates a block diagram of yet another transmission process 500 for D2D communication in accordance with an embodiment of the present invention;

FIG. 7 illustrates a block diagram of another apparatus 700 for supporting D2D communication in accordance with an embodiment of the present invention;

FIG. 8 shows a flow chart of a method for D2D communication according to an embodiment of the present invention.

800;

FIG. 9 shows a flow chart of a method for D2D communication according to an embodiment of the present invention.

900. detailed description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Figure 1 shows an illustration of D2D communication under a cellular system in a single cell scenario, where UE1, UE2 and UE3 are D2D UEs, and UE4 and UE5 are cellular UEs. It should be understood by those skilled in the art that the number of UEs in the cellular system shown in FIG. 1 is schematic, and in actual applications, more or fewer UEs may be included.

In conventional cellular communication, if UE1 wants to transmit data to UE2, UE1 should transmit data to the base station eNB in the uplink time-frequency resource, and then the eNB is in the downlink. Forwarding data to UE2 in the link time-frequency resource. For convenience of explanation, it is assumed here that UE1 needs to transmit data to UE2. However, those skilled in the art should understand that similar operations can be directly applied to the case where UE2 needs to transmit data to UE1. Figure 2 illustrates an approximate transmission process 200 for a cellular communication. As shown in FIG. 2, in step S201, the UE1 sends a resource requirement (for example, but not limited to a scheduling request and a buffer status report) to the eNB. In step S202, the eNB sends PDCCH1 to the UE1 in the (nl)th subframe to indicate scheduling information. In step S203 (not shown in FIG. 2), UE1 uses its own C-RNTI to decode DCI (Downlink Control Information) in the PDCCH, and obtains the allocated resource location; S204. The UE1 sends data to the eNB in the frequency resource allocated in the uplink transmission by the (nl+k) (k is a predetermined and k>4) subframes. In step S205: the eNB is in the downlink transmission. (n2) subframes transmit PDCCH2 to UE2 and forward the data; finally, in step S206, UE2 decodes the DCI in PDCCH2 using its own C-RNTI, and obtains the allocated resource location. The PDSCH is then decoded in the allocated resource location in the (n2)th subframe.

In the process shown in Figure 2, the eNB needs to send to UE1 in the uplink transmission.

PDCCH1, and also needs to transmit another PDCCH2 to UE2 in the downlink transmission. That is, two PDCCH resources need to be allocated for each pair of D2D UEs.

On the basis of this, the following method for supporting D2D communication is proposed with reference to Figs. 3 to 5 in accordance with an exemplary embodiment of the present invention.

Method 1

In order to be able to use the existing PDCCH identified by the C-RNTI, the eNB will transmit two PDCCHs to the UE1 and the UE2 in the (nl)th subframe. Note that since the time axis of this method is different from the time axis of cellular communication, the eNB needs to inform the D2D transmission direction (for example, if the two user equipments perform D2D transmission, whether the D2D communication is UE1->UE2 or UE2->UE1) Or sender and receiver. In an alternative embodiment of the invention, it is also possible to signal the current UE communication mode, such as D2D communication or cellular communication. Additional signaling is therefore required (eg, by using two reserved bits in the existing DCI or otherwise). The D2D UE will select the corresponding operation according to this indication. In one implementation, for example, several bits can be introduced as follows, for example two bits (bl, B2) to indicate the communication mode and / or communication direction (that is, determine the transmitter and receiver):

(1) blb2 = 00 indicates D2D communication UE1->UE2, that is, UE1 is the sender and UE2 is the receiver;

(2) blb2 = 01 indicates D2D communication UE2->UE1, that is, UE2 is the sender and UE1 is the receiver;

(3) blb2 = 10 indicates cellular communication;

(4) blb2 = 11 reserved.

It should be understood by those skilled in the art that the above-mentioned bits are only for the purpose of illustration and are not intended to limit the invention. For example, blb2=01 can be set to indicate D2D communication UE1->UE2, or other settings can be made, or more bits can be set. In addition, the signaling for indication may be set in the subframe, frequency, or antenna port in addition to the reserved bits of the DCI.

It is still assumed that a situation in which data needs to be transmitted from UE1 to UE2 is required. Figure 3 illustrates a transmission process 300 for D2D communication under Method 1 in accordance with an embodiment of the present invention. As shown in FIG. 3, UE1 transmits a resource request to the eNB in step S301. In step S302, the eNB transmits PDCCH1 (identified by the C-RNTI of UE1) to UE1 in the nth subframe and transmits PDCCH2 to UE2 (C of UE2) - RNTI identification); In step S303 (not shown in Fig. 3), UE1 decodes the DCI in PDCCH1 using its own C-RNTI, and obtains the allocated resource location and the indication bit allocated in the DCI. UE2 uses its own C-RNTI to decode the DCI in PDCCH2, and obtains the allocated resource location and the indication bit in the DCI (assuming that the reserved bits in the DCI are used to signal the communication direction, but as mentioned above, this is not a Limitations of the invention). In step S304, according to the indication bit blb2 = 00, UE1 transmits data to UE2 at the (nl+k)th subframe at the allocated resource location, and UE2 is allocated at (nl+k) (where k > 4) subframes The resource location is received at the resource location. The advantage of using this method is that it reuses the PDCCH in cellular communications.

2. Method 2

In method 2, the present invention introduces a paired RNTI (paired-RNTI) to identify a corresponding paired PDCCH (paired-PDCCH). Still sending UE1 to UE2 to send data This 'It's shape is an example. Under this method, the eNB only needs to send one PDCCH for each pair of D2D UEs (for example, UE1-UE2 pairs).

Note that the eNB still needs to inform the D2D UE of the transmission direction (eg, UE 1 -> UE2 or UE2-> UE1), thus requiring additional signaling (eg, by using one of the reserved bits in the existing DCI or otherwise) To give instructions. The D2D UE will select the corresponding operation according to this indication. In a preferred embodiment of the invention, only one bit (bl) may be introduced to indicate the direction of communication (determining the transmitter and receiver), for example:

(1) bl = 0 indicates D2D communication UE1->UE2, that is, UE1 is the sender and UE2 is the receiver;

(2) bl = 1 indicates D2D communication UE2-> UE1, that is, UE2 is the sender and UE1 is the receiver.

It will be understood by those skilled in the art that the above-mentioned bits are only for the purpose of illustration and are in no way intended to limit the invention. For example, bl=l can be set to indicate D2D communication UE1->UE2, or other settings can be made, or more bits can be set. In addition, the signaling for indication may be set in the subframe, the frequency, or the antenna port in other ways, in addition to being set by the reserved bits of the DCI.

4 illustrates a transmission process 400 for D2D communication under method 2 in accordance with an embodiment of the present invention. In step S401, the UE1 sends a resource request to the eNB; in step S402, the eNB transmits a pair of PDCCHs (which will be identified by the paired RNTIs) in the (nl)th subframe, that is, the eNB is in the (nl)th subframe. Transmitting the same PDCCH to UE1 and UE2; in step S403 (not shown in FIG. 4), UE1 and UE2 decode the DCI in the PDCCH with paired RNTK instead of C-RNTI), and obtain the allocated resource location and in DCI The indication bit in (assuming that the reserved bits in the DCI are used to signal the communication direction, but as previously mentioned, this is not a limitation of the present invention). In step S404, the #居 indicates the bit bl = 0, and the UE1 transmits data to the UE2 at the allocated resource location in (nl+k) subframes, and the UE2 is in the (nl+k) (where k > 4) subframes The data transmitted from UE1 is received at the allocated resource location. The advantage of this method is that it uses only one PDCCH for a pair of UEs, reducing the overhead of the PDCCH. 3. Method 3

Many D2D scenarios involve direct communication within a group of devices, such as mobile multiplayer games, file sharing, mobile advertising, streaming services, and collaborative downloads. In these scenarios, multiple UEs in a wireless communication system (e.g., depending on service type, etc.) can be grouped into groups or clusters, so it is also necessary to design efficient transmissions for D2D UEs in the same group/cluster. The group RNTI (group-RNTI) is similarly introduced to identify the corresponding PDCCH.

Referring back to Figure 1, there are shown three D2D devices in a group, namely UE1, UE2 and UE3. The transmission procedure of this method is similar to that of Method 2. The main differences are: (1) All D2D UEs in a group are identified by the same group RNTI;

(2) In order to achieve the correct communication of the UE involved, some additional information is needed to inform the UE of the transmission mode (unicast or multicast/broadcast) and the transmission direction (determining the sender and the receiver), which can be in the following two ways get on:

- by using bits reserved in the current DCI or otherwise defining explicit indications;

- Implied indication embedded in the subframe/frequency/antenna port.

For the case of implementing D2D communication in an explicit manner, the present invention gives an example as follows: Three D2D UEs are employed in one group as an example. Thus, there are nine possible communication modes, so for example blb2b3b4 is required to make the following indication:

(1) blb2b3b4 = 0000 indicates unicast communication UE1->UE2;

(2) blb2b3b4 = 0001 indicating unicast communication UE1->UE3;

(3) blb2b3b4 = 0010 indicating unicast communication UE2->UE1;

(4) blb2b3b4 = 0011 indicating unicast communication UE2->UE3;

(5) blb2b3b4 = 0100 indicates unicast communication UE3->UE1;

(6) blb2b3b4 = 0101 indicating unicast communication UE3->UE2;

(7) Mb2b3b4 = 0110 indicating multicast communication UE1-> UE2, UE3;

(8) 3⁄4»^2 3 4 = 0111 indicating multicast communication 1^2->1^1, UE3;

(9) Mb2b3b4 = 1000 indicates multicast communication UE3-> UE1, UE2.

It will be understood by those skilled in the art that the above-mentioned bits are only for the purpose of illustration and are in no way intended to limit the invention. For example, it can be Setting blb2b3b4 = 0001 to indicate D2D communication UE1->UE2, or making other settings, can also be set with more bit bits.

For the case of the implicit indication embedded in the subframe/frequency/antenna port, the foregoing example is still used, and the item numbers (1) - (9) indicate the subframe number in the radio frame. According to an implementation of the present invention, for example, only UE1 and UE2 in the group may receive the PDCCH from the eNB in subframe 1, and if they successfully detect the scheduling information, execute in the indicated subframe in the allocated resource. Corresponding D2D communication, and other UEs in the group remain in sleep mode, thereby reducing power consumption. The use of implied indications in the frequency/antenna port is similar.

Figure 5 illustrates a transmission process 500 for D2D communication under method 3 in accordance with an embodiment of the present invention. In step S501, UE1 sends a resource request to the eNB; in step S502, the eNB transmits one PDCCH in the (nl)th subframe, the PDCCH is identified by the group RNTI; in step S503 (not shown in FIG. 5), three D2D UEs Each PDCCH is decoded using a group RNTI, and each D2D UE obtains its resource allocation location and an explicit indicator bit, or an implicit subframe/frequency/antenna binding. In step S504, according to the indication of the indication bit blb2b3b4=0000, the UE1 transmits data to the UE2 at the (nl+k)th subframe at the allocated resource location, and the UE2 is at the (nl+k)th subframe at the allocated resource location. Receiving data on, UE3 will know that the decoded PDCCH is not for itself, so no operation is performed in the (nl+k)th subframe, where k > 4. The advantages of adopting this method are as follows: (1) The UE can directly communicate with any UE in the same group by using one group RNTI, and does not require an additional paired RNTI when the communication pair is changed; (2) is particularly suitable for multiple Broadcast/broadcast communication.

Figures 8 and 9 respectively show flow diagrams of methods 800 and 900 for supporting D2D communication, corresponding to methods 1-3 previously described with reference to Figures 3-5.

For example, as shown in FIG. 8, after the method 800 starts, the process proceeds to step S802, and a resource request message for D2D communication is received from the first user equipment (for example, corresponding to steps S301, S401, and S501 in FIG. 3 to FIG. 5). . The method 800 then proceeds to step S804, in response to the resource request message, respectively transmitting a first physical downlink control channel and a second physical downlink control channel to the first user equipment and the second user equipment, and Signaling for indicating the sender and receiver of the D2D communication (e.g., corresponding to steps S302, S402, and S502 in Figures 3-5).

According to a preferred embodiment of the present invention, the transmission of the first physical downlink control channel and the second physical downlink control channel is performed in the same subframe.

According to a preferred embodiment of the present invention, the first physical downlink control channel is the same as the second physical downlink control channel (e.g., corresponding to steps S402, S502 in Figures 4 and 5).

According to an optional implementation of the present invention, a plurality of user equipments in the wireless communication system are divided into one or more groups, and the first user equipment and the second user equipment are in the same group. And the method further includes: transmitting the first physical downlink control channel to all other user equipments in the same group as the first user equipment and the second user equipment (eg, corresponding to FIG. 5 Step S502).

Further, according to an optional embodiment of the present invention, the signaling is provided in one of: downlink control information in the first physical downlink control channel and the second physical downlink control channel DCI, subframe, frequency, and antenna port.

At this point, method 800 ends.

As shown in Fig. 9, after the method 900 starts, the process proceeds first to step S902, and a resource request message for D2D communication is transmitted to the base station (e.g., corresponding to steps S301, S401, and S501 in Figs. 3 to 5). The method 900 then proceeds to step S904, receiving a physical downlink control channel from the base station, and signaling for indicating the sender and the receiver of the D2D communication (eg, corresponding to the steps in FIGS. 3-5). S302, S402 and S502). Next, the method 900 proceeds to step S906 to decode the physical downlink control channel by the corresponding radio network temporary identity RNTI. Finally, the method 900 proceeds to step S908 to perform the D2D communication with one or more user equipments based on the decoded information in the physical downlink control channel and the signaling (eg, corresponding to FIG. 3 - Steps S304, S404, and S504 in 5.

According to an optional embodiment of the invention, the signaling is provided in one of: downlink control information DCI, subframes, frequencies and antenna ports in the physical downlink control channel. According to an optional embodiment of the present invention, the D2D communication with one or more user equipments includes one of unicast, multicast, and broadcast.

At this point, method 900 ends.

Referring now to Figure 6, a block diagram of an apparatus 600 for supporting D2D communication in accordance with an embodiment of the present invention is shown. As shown in FIG. 6, according to an embodiment of the present invention, the device 600 includes: a receiving device 601, configured to receive a resource request message for D2D communication from a first user equipment; and a first sending device 602, configured to respond to Sending, by the resource request message, a first physical downlink control channel and a second physical downlink control channel to the first user equipment and the second user equipment, respectively, and providing a sender for indicating the D2D communication And the signaling of the receiver.

According to some embodiments of the present invention, the transmitting of the first physical downlink control channel and the second physical downlink control channel is performed in the same subframe.

According to some embodiments of the present invention, the first physical downlink control channel is the same as the second physical downlink control channel.

According to some embodiments of the present invention, a plurality of user equipments in the wireless communication system are divided into one or more groups, and the first user equipment and the second user equipment are in the same group, and The device 600 further includes: a second sending device 603, configured to send the first PDCCH to all other user equipments in the same group as the first user equipment and the second user equipment, and provide Signaling of the sender and receiver of the D2D communication.

According to some embodiments of the present invention, the signaling is provided in one of: downlink control information DCI in the first physical downlink control channel and the second physical downlink control channel, Subframe, frequency, and antenna port.

Reference is now made to Fig. 7, which shows a block diagram of another apparatus 700 for supporting D2D communication in accordance with an embodiment of the present invention. As shown in FIG. 7, the device 700 includes: a sending device 701, configured to send a resource request message for D2D to a base station, and a receiving device 702, configured to receive a physical downlink from the base station, according to an embodiment of the present invention. a control channel, and signaling for indicating a sender and a receiver of the D2D communication; a decoding device 703, configured to temporarily decode the physical downlink control channel by a corresponding wireless network; and the communication device 704 , the physical downlink for decoding based Information in the channel control channel and the signaling, described in association with one or more user equipments

D2D communication.

According to some embodiments of the present invention, the signaling is provided in one of: downlink control information DCI, a subframe, a frequency, and an antenna port in the physical downlink control channel.

According to some embodiments of the present invention, the D2D communication with one or more user equipments includes one of unicast, multicast, and broadcast.

It should be understood that the division of the various devices in devices 600 and 700 is not limiting and is exemplary. For example, the functions of a single device in the above description may be implemented by multiple devices. Conversely, the various devices described above may also be implemented by a single device. The scope of the invention is not limited in this respect.

It should also be understood that the various devices included in devices 600 and 700 can be implemented in a variety of ways, including software, hardware, firmware, or any combination thereof. For example, in some embodiments, the various devices of devices 600 and 700 can be implemented using software and/or firmware modules. Alternatively or additionally, the devices of devices 600 and 700 can also be implemented using hardware modules. For example, the devices of devices 600 and 700 can be implemented as an integrated circuit (IC) chip or an application specific integrated circuit (ASIC). The devices of devices 600 and 700 can also be implemented as a system on a chip (SOC). Other ways now known or later developed are also possible, and the scope of the invention is not limited in this respect.

The principles and spirit of the present invention have been described above in connection with a number of exemplary embodiments. According to an embodiment of the present invention, D2D communication can be efficiently realized, PDCCH overhead can be reduced, and device-to-device multicast and multicast can be conveniently performed.

It should be noted that the flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and apparatus in accordance with various embodiments of the present invention. In this regard, each block of the flowchart or block diagram can represent a module, a program segment, or a portion of code, the module, the program segment, or a portion of code comprising one or more Executable instructions. It should also be noted that in some alternative implementations, the functions noted in the blocks may also occur in a different order than that illustrated in the drawings. For example, two successively represented blocks may actually be executed substantially in parallel, sometimes It can also be performed in the reverse order, depending on the function involved.

It should also be noted that each block of the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts can be implemented by a dedicated hardware-based system that performs the specified function or operation, or It can be implemented in a combination of dedicated hardware and computer instructions. The drawings and the embodiments of the present invention are to be considered as illustrative only and not limiting the scope of the invention.

The methods disclosed in the embodiments of the present invention can be implemented in software, hardware, or a combination of software and hardware. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor, personal computer (PC), or mainframe. In a preferred embodiment, the invention is implemented as software including, but not limited to, firmware, resident software, microcode, and the like. In the form of a computer program product that reads media access, the media provides program code for use by or in connection with a computer or any instruction execution system. For the purposes of this description, a computer-usable or computer-readable mechanism can be any tangible device that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

The medium can be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system (or apparatus or device) or a propagation medium. Examples of computer readable media include semiconductor or solid state memory, magnetic tape, removable computer disks, random access memory (RAM), read only memory (ROM), hard disk and optical disk. Examples of current optical discs include compact disc-read only memory (CD-ROM), compact disc-read/write (CD-R/W), and DVD.

A system suitable for storing and/or executing program code in accordance with embodiments of the present invention will include at least one processor coupled directly or indirectly through a system bus to a memory memory, a mass storage, and a temporary providing at least a portion of program code. A cache memory that is stored to reduce the number of times the code must be fetched from the mass storage during execution.

Input/output or I/O devices (including but not limited to keyboards, displays, pointing devices, etc.) Etc.) can be coupled to the system either directly or through an intermediate I/O controller.

Network adapters can also be coupled to the system to enable the system to be coupled to other systems or remote printers or storage devices through intervening private or public networks. Modems, cable modems, and Ethernet cards are just a few examples of the types of network adapters currently available.

It should be noted that in order to make the embodiments of the present invention easier to understand, the above description omits some more specific technical details that are well known to those skilled in the art and may be necessary for implementation of embodiments of the present invention. .

The description of the present invention has been presented for purposes of illustration and description. Many modifications and variations are conceivable to those skilled in the art.

Although several embodiments of the invention have been described above, it will be understood by those skilled in the art Various modifications and changes may be made to the embodiments of the present invention without departing from the scope of the invention. Therefore, the features described in the specification should not be considered as limiting. The scope of the invention is to be limited only by the appended claims.

Claims

Claim

A method for supporting device-to-device D2D communication in a wireless communication system, comprising:

Receiving, by the first user equipment, a resource request message for D2D communication; and transmitting, in response to the resource request message, a first physical downlink control channel and a second physical to the first user equipment and the second user equipment, respectively A downlink control channel, and providing signaling for indicating a sender and a receiver of the D2D communication.

The method according to claim 1, wherein the transmission of the first physical downlink control channel and the second physical downlink control channel is performed in the same subframe.

The method according to claim 1 or 2, wherein the first physical downlink control channel is the same as the second physical downlink control channel.

The method according to claim 3, wherein a plurality of user equipments in the wireless communication system are divided into one or more groups, and the first user equipment and the second user equipment are in the same group Group, and the method further comprises:

Transmitting the first physical downlink control channel to all other user equipments in the same group as the first user equipment and the second user equipment.

5. The method of claim 1 or 2, wherein the signaling is provided in one of: the first physical downlink control channel and the second physical downlink control channel Downlink control information DCI, subframe, frequency, and antenna port.

6. A device for supporting device-to-device D2D communication in a wireless communication system, comprising:

a receiving device, configured to receive, from the first user equipment, a resource request message for D2D communication;

a first sending device, configured to send, to the first user equipment and the second user equipment, a first physical downlink control channel and a second physical downlink control channel, respectively, in response to the resource request message, and provide Signaling indicating the sender and receiver of the D2D communication.

The apparatus according to claim 6, wherein the transmission of the first physical downlink control channel and the second physical downlink control channel is performed in the same subframe.

The device according to claim 6 or 7, wherein the first physical downlink control channel is the same as the second physical downlink control channel.

9. The device according to claim 8, wherein the plurality of user equipments in the wireless communication system are divided into one or more groups, and the first user equipment and the second user equipment are in the same group Group, and the device further comprises:

a second sending device, configured to send the first PDCCH to all other user equipments in the same group as the first user equipment and the second user equipment, and provide a sender for indicating the D2D communication And the signaling of the receiver.

10. The apparatus according to claim 6 or 7, wherein the signaling is provided in one of: a downlink in the first physical downlink control channel and the second physical downlink control channel Link control information DCI, subframe, frequency, and antenna port.

11. A method for supporting device-to-device D2D communication in a wireless communication system, comprising:

Sending a resource request message for D2D communication to the base station;

Receiving, from the base station, a physical downlink control channel, and signaling for indicating a sender and a receiver of the D2D communication;

Decoding the physical downlink control channel by a corresponding wireless network temporary identity RNTI;

The D2D communication with one or more user equipments based on the decoded information in the physical downlink control channel and the signaling.

The apparatus according to claim 11, wherein the signaling is provided in one of: downlink control information DCI, a subframe, a frequency, and an antenna port in the physical downlink control channel.

13. The method of claim 11 or 12, wherein the D2D communication with one or more user equipments comprises one of unicast, multicast, and broadcast.

14. A device for supporting device-to-device D2D communication in a wireless communication system, comprising:

a sending device, configured to send a resource request message for D2D to the base station; a receiving device, configured to receive a physical downlink control channel from the base station, and signaling used to indicate a sender and a receiver of the D2D communication;

a decoding device, configured to temporarily decode the physical downlink control channel by using a corresponding wireless network temporary identifier RNTI;

And a communication device, configured to perform the D2D communication with one or more user equipments based on the information in the decoded physical downlink control channel and the signaling.

The apparatus according to claim 14, wherein the signaling is provided in one of: downlink control information DCI, a subframe, a frequency, and an antenna port in the physical downlink control channel.

16. The device of claim 14 or 15, wherein the D2D communication with one or more user devices comprises one of unicast, multicast, broadcast.