CN103002578B - Realize the method for D2D data transmission, Apparatus and system in cellular networks - Google Patents

Abstract

The invention discloses a method, device and system for realizing D2D data transmission in a cellular network. The resource allocation method includes: a base station receives a data transmission request sent by a first user equipment UE; wherein, the first UE and the second UE The device-to-device communication D2D connection has been established between; according to the received data transmission request, allocate radio resources for the data transmission between the first UE and the second UE, and send the radio resource allocation result to the first UE and/or the second UE UE. The data transmission method includes: the first user equipment UE sends a data transmission request to the base station; the first UE and the second UE receive the radio resource allocation result returned by the base station; the first UE uses the radio resource allocated by the base station to transmit data to the second UE, The second UE receives the data transmitted by the first UE by using the radio resources allocated by the base station. The method realizes D2D data transmission in a cellular network.

Description

Method, device and system for realizing D2D data transmission in cellular network

technical field

The present invention relates to the field of communication technologies, in particular to a method, device and system for realizing device-to-device communication (Device to Device Communication, D2D) data transmission in a cellular network.

Background technique

Device-to-Device Communication (Device to Device Communication, D2D) refers to direct communication between user devices without infrastructure, and D2D in the prior art uses technologies such as Bluetooth and Wireless Fidelity (Wireless Fidelity, WIFI). The existing cellular network does not support D2D, and the communication between user equipment must transmit data through the base station. If D2D can be implemented in the cellular network, it will be possible for the user equipment with a short distance to discover each other and directly transmit data with the other party, thereby saving air interface and core network resources and providing new services, such as battle games and short-distance broadcasting , Machine to Machine Communication (M2M) and so on. Therefore, how to implement D2D in cellular networks has become a research hotspot.

At present, most of the research results are focused on academic theoretical research such as algorithms for realizing D2D resource allocation, while in actual cellular networks, especially in Long Term Evolution (Long Term Evolution, LTE) networks, the relevant information for realizing D2D resource allocation and data transmission There are not many studies, that is to say, there is currently a lack of methods to implement D2D resource allocation and data transmission in cellular networks.

Contents of the invention

An embodiment of the present invention provides a method for implementing D2D data transmission in a cellular network, so as to solve the problems of implementing D2D resource allocation and data transmission in a cellular network.

An embodiment of the present invention provides a method for implementing D2D resource allocation in a cellular network, including:

The base station receives a data transmission request sent by the first user equipment UE; wherein, a device-to-device communication D2D connection has been established between the first UE and the second UE;

Allocate radio resources for data transmission between the first UE and the second UE according to the received data transmission request, and send the radio resource allocation result to the first UE and/or the second UE.

The embodiment of the present invention also provides a method for realizing D2D data transmission in a cellular network, including:

The first user equipment UE sends a data transmission request to the base station, wherein a device-to-device communication D2D connection has been established between the first UE and the second UE;

The first UE and the second UE receive radio resource allocation results returned by the base station, wherein the base station allocates radio resources for data transmission between the first UE and the second UE according to the received data transmission request;

The first UE transmits data to the second UE by using the radio resources allocated by the base station, and the second UE receives the data transmitted by the first UE by using the radio resources allocated by the base station.

An embodiment of the present invention provides a device for implementing D2D resource allocation in a cellular network, including:

The first receiving unit is configured to receive a data transmission request sent by the first user equipment UE; wherein, a device-to-device communication D2D connection has been established between the first UE and the second UE;

a resource allocation unit, configured to allocate wireless resources for data transmission between the first UE and the second UE according to the received data transmission request;

The first sending unit is configured to send the radio resource allocation result to the first UE and/or the second UE.

An embodiment of the present invention provides a base station, including the above-mentioned device for implementing D2D resource allocation in a cellular network.

An embodiment of the present invention provides a device for realizing D2D data transmission in a cellular network, including:

The second sending unit is configured to send a data transmission request to the base station, wherein a device-to-device communication D2D connection has been established between the first UE where it is located and the second UE;

The second receiving unit is configured to receive the radio resource allocation result returned by the base station according to the received data transmission request sent by the second sending unit, wherein the radio resource allocation result includes that the base station provides the first UE with the received data transmission request radio resources allocated for data transmission with the second UE;

A data transmission unit, configured to use radio resources allocated by the base station to transmit data to the second UE.

An embodiment of the present invention provides another device for realizing D2D data transmission in a cellular network, including:

The third receiving unit is configured to receive the radio resource allocation result returned by the base station according to the received data transmission request sent by the first user equipment UE, wherein the second UE where it is located has established device-to-device communication with the first UE D2D connection; the radio resource allocation result includes radio resources allocated by the base station for data transmission between the second UE and the first UE;

The data receiving unit is configured to use the radio resource allocated by the base station to receive the data transmitted by the first UE.

An embodiment of the present invention provides a user equipment, including at least one of the above-mentioned apparatuses for implementing D2D data transmission in a cellular network.

An embodiment of the present invention provides a communication system, including at least one of the above-mentioned base stations and at least two of the above-mentioned user equipments;

Wherein, the user equipment serving as the data transmitting party includes at least a second sending unit, a second receiving unit, and an apparatus for implementing D2D data transmission in a cellular network, and the user equipment serving as a data receiving party includes at least a third receiving unit A device for implementing D2D data transmission in a cellular network as a unit and a data receiving unit. .

The beneficial effects of the present invention are as follows:

The embodiment of the present invention provides a method for implementing D2D resource allocation and data transmission in a cellular network. After the first UE and the second UE establish a D2D connection, the first UE sends a data transmission request to the base station, and the base station receives the data transmission request. Allocate radio resources for data transmission between the first UE and the second UE, and send the radio resource allocation results to the first UE and/or the second UE, and the first UE and the second UE receive the radio resource allocation results returned by the base station , the first UE uses the radio resources allocated by the base station to transmit data to the second UE, and the second UE uses the radio resources allocated by the base station to receive the data transmitted by the first UE. So far, the implementation of D2D resource allocation and data transmission in the cellular network is completed. Since the resource allocation is done by the base station, it is convenient to control, manage and bill the network resources, monitor the network status in real time, and provide users with better service quality. After the base station allocates resources for the first UE and the second UE, the first UE and the second UE use the resources allocated by the base station for data transmission, which also realizes D2D data transmission in the cellular network.

Description of drawings

FIG. 1 is a flowchart of a method for allocating D2D resources in an embodiment of the present invention;

FIG. 2 is a schematic diagram of D2D resource allocation and data transmission signaling interaction in an embodiment of the present invention;

FIG. 3 is a flowchart of a method for D2D data transmission in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a guard frequency band between time division duplex and frequency division duplex in an embodiment of the present invention;

FIG. 5 is a flowchart of a method for D2D resource allocation and data transmission in a preferred embodiment of the present invention;

FIG. 6 is a structural diagram of a device for D2D resource allocation in an embodiment of the present invention;

FIG. 7 is a structural diagram of a device for D2D data transmission in an embodiment of the present invention;

FIG. 8 is a structural diagram of another device for D2D data transmission in an embodiment of the present invention.

detailed description

Aiming at solving the problem of implementing D2D resource allocation and data transmission in a cellular network, an embodiment of the present invention provides a method for implementing D2D resource allocation in a cellular network. The flow of the method of the present invention is shown in FIG. 1, and FIG. The channels and signaling used in each step in Figure 1, the specific execution steps are as follows:

Step S11: the base station receives a data transmission request sent by a first user equipment (User Equipment, UE).

Before performing the above steps, a Device to Device Communication (D2D) connection has been established between the first UE and the second UE. When data needs to be transmitted between the first UE and the second UE, the data transmission party first sends a data transmission request to the base station, and the base station receives the data transmission request sent by the data transmission party. In practical applications, the first UE may be used as a data transmitter, and the second UE may be a data receiver. Of course, the second UE may also be used as a data transmitter, and the first UE may be used as a data receiver. In the following description, the first UE is used as a data transmitter and the second UE is used as a data receiver as an example for illustration.

Specifically, the base station receiving the data transmission request sent by the first UE specifically includes: the base station receiving the buffer status report control signaling sent by the first UE through the physical uplink shared channel, wherein the buffer status report control signaling carries the data request information.

According to the provisions of the LTE (Long Term Evolution, Long Term Evolution) protocol, the first UE initiates buffer status report (BufferStatusReport, BSR) control signaling to the base station (eNodB), and the signaling can be sent in a physical uplink shared channel (PhysicalUplinkSharedChannel, PUSCH). When there is no uplink resource PUSCH to send BSR control signaling, the first UE first sends a Scheduling Request (SchedulingRequest, SR) control signaling to the base station, which can be sent through a Physical Uplink Control Channel (PUCCH), and the base station receives After the SR control signaling, a small amount of uplink resources are allocated to the first UE, that is, a small amount of PUSCH is allocated to send the BSR control signaling.

Step S12: Allocate radio resources for data transmission between the first UE and the second UE according to the received data transmission request.

In the LTE system, the base station usually considers the channel quality of each radio link when performing resource allocation.

Specifically, the base station allocates wireless resources for the data transmission between the first UE and the second UE according to the received data transmission request, including: the base station monitors and receives both information sent by the first UE and the second UE through the physical uplink control channel The channel quality indication information of the channel between them; according to the received channel quality indication information, the radio resource channel quality between the first UE and the second UE is judged, and the first UE and the second UE are determined according to the judged radio resource channel quality. Allocate wireless resources.

When D2D is implemented in the cellular network for resource allocation, the base station can know the channel status between the first UE and the second UE through the channel quality indicator information (ChannelQualityIndicator, CQI) reported to the base station periodically or aperiodically. Since the first UE and the second UE have established a D2D connection, the first UE and the second UE will periodically report the channel quality indication information of the channel with the opposite end to the base station. The CQI can be sent through PUCCH. Here, the first UE/second UE is capable of performing channel estimation according to an uplink pilot signal (Sounding Reference Signal, SRS) sent by the second UE/first UE. The LTE base station in the prior art has this capability, but the LTE user equipment does not have this capability.

Step S13: Send the radio resource allocation result to the first UE and/or the second UE.

Specifically, the foregoing sending of the radio resource allocation result to the first UE and/or the second UE may be performed in the following manners:

The first type: the base station sends the first radio resource allocation signaling carrying the first UE identification information to the first UE through the Physical Downlink Control Channel (PDCCH), and sends the second radio resource allocation signaling carrying the second UE identification information The signaling is sent to the second UE.

In the LTE system, when the base station sends signaling to the user equipment, it will carry the radio network temporary identifier (C-RNTI) of the user equipment, so the user equipment can blindly detect the various signaling received by the base station. Signaling carrying its own C-RNTI.

The base station sends the first radio resource allocation signaling carrying the C-RNTI of the first UE and the second radio resource allocation signaling carrying the C-RNTI of the second UE to the first UE and the second UE respectively, and then, the first The UE and the second UE only need to blindly detect the signaling carrying their own C-RNTI, where the C-RNTI is used as identification information. This method does not increase the number of UE blind detections.

The second type: the base station sends the third radio resource allocation signaling carrying the first UE identification information and the radio resource scheduling identification to the first UE through a physical downlink control channel.

The base station sends the third radio resource allocation signaling carrying the C-RNTI of the first UE and a downlink control information (Downlink Control Information, DCI) format to the first UE, wherein the DCI format is used as a radio resource scheduling identifier. Then the first UE and the second UE can blindly detect the third radio resource allocation signaling carrying the C-RNTI and DCI format of the first UE at the same time, so as to obtain the radio resource allocated by the base station.

Here, the second UE may blindly detect the signaling containing the first UE identification information sent by the base station, and the second UE obtains the first UE identification information when establishing a D2D connection with the first UE. In this case, errors may occur, because the base station will send a lot of signaling to the first UE, and the second UE may take the signaling sent by the base station to the first UE that is not for resource allocation as radio resource allocation signaling, for example , in step S11, the base station responds to the BSR control signaling requesting scheduling resources sent by the first UE, for the purpose of allocating resources to the first UE and sending the BSR control signaling, not for the first UE to transmit to the second UE data. In order to avoid the occurrence of the above errors, the Flagforformat0/format1Adifferentiation field identifier in the DCI format can be used to identify whether the signaling sent by the base station allocates radio resources for the D2D connection to transmit data with the second UE.

The third method: the base station sends the fourth radio resource allocation signaling carrying the identification information of the second UE and the radio resource scheduling identification to the second UE through a physical downlink control channel.

The base station sends the fourth radio resource allocation signaling carrying the C-RNTI of the second UE and a downlink control information (Downlink Control Information, DCI) format to the second UE, where the DCI format is used as a radio resource scheduling identifier. Then the first UE and the second UE can blindly detect the fourth radio resource allocation signaling carrying the C-RNTI and DCI format of the second UE at the same time, so as to obtain the radio resource allocated by the base station.

Here, the first UE may blindly detect the signaling containing the identity information of the second UE sent by the base station, and the first UE obtains the identity information of the second UE when establishing a D2D connection with the second UE. The reason for carrying the radio resource scheduling identifier in the fourth radio resource allocation signaling is the same as that of the second case, and will not be repeated here.

The above two methods will not increase the signaling overhead, but need to increase the number of blind detection times of the UE. In an actual situation, the UE only needs to detect the corresponding DCIFormat in the signaling, therefore, the number of times of blind detection that the UE needs to increase is not very large.

FIG. 2 only shows the channels and signaling used in the first manner, and the channels and signaling used in the second and third manners are not shown.

Preferably, after the above step S13, it also includes:

Step S14: The base station receives the data reception result returned by the second UE after receiving the data transmitted by the first UE using the radio resources allocated by the base station, and determines whether it is a retransmission between the first UE and the second UE according to the received data reception result Data reserves allocated radio resources.

When the second UE receives the data transmitted by the first UE, the reception may be successful or may fail, so the second UE needs to return the data reception result to the base station.

Specifically, the above-mentioned base station receiving the data receiving result returned by the second UE after receiving the data transmitted by the first UE using the radio resources allocated by the base station specifically includes: the base station receiving the second UE through the physical uplink control channel. The data reception feedback signaling carrying successful ACK/failure NACK information; or the base station receives the data carrying successful ACK/failure NACK information sent by the second UE through the guard frequency band between frequency division duplex and time division duplex in the physical uplink control channel Receive feedback signaling.

The second UE may carry ACK/NACK information in the data reception feedback signaling sent to the base station. When the data reception feedback signaling carries NACK, the base station may reserve Previously allocated wireless resources; when the data reception feedback signaling carries ACK, the base station does not need to reserve previously allocated wireless resources for them.

An embodiment of the present invention provides a method for implementing D2D data transmission in a cellular network. The process flow is shown in FIG. 3 . FIG. 2 shows the channels and signaling used when executing the steps in FIG. 3 , and the execution steps are as follows:

Step S21: the first UE sends a data transmission request to the base station.

Before performing the above steps, a D2D connection has been established between the first UE and the second UE.

Specifically, the above-mentioned first UE sending the data transmission request to the base station specifically includes: the first UE sends buffer status report control signaling to the base station through a physical uplink shared channel.

According to the provisions of the LTE protocol, the first UE initiates BSR control signaling to the base station, and the signaling can be sent in the PUSCH. When there is no uplink resource PUSCH to send BSR control signaling, the first UE first sends SR control signaling to the base station. The signaling can be sent through the PUCCH. After receiving the SR control signaling, the base station allocates a small amount of uplink Resources, that is, allocate a small amount of PUSCH to send BSR control signaling.

Step S22: the first UE and the second UE receive the radio resource allocation result returned by the base station, wherein the base station allocates radio resources for data transmission between the first UE and the second UE according to the received data transmission request.

Specifically, the above-mentioned first UE and second UE receive the radio resource allocation result returned by the base station, and for the three sending methods of the base station in step S13, there are also three ways for the first UE and the second UE to receive, specifically including:

The first type: the first UE blindly detects the first radio resource allocation signaling carrying its own identification information, and the second UE blindly detects the second radio resource allocation signaling carrying its own identification information.

The first UE and the second UE only need to blindly detect the signaling with their own C-RNTI. This method does not increase the number of times of UE blind detection, but compared with the traditional LTE network resource allocation method, it will increase signaling overhead.

The second type: the first UE blindly detects the fourth radio resource allocation signaling carrying the second UE identification information and the radio resource scheduling identification; wherein, the first UE and the second UE obtain the peer identification information when establishing a D2D connection.

The first UE and the second UE can blindly detect the fourth radio resource allocation signaling carrying the C-RNTI and DCI format of the second UE at the same time, so as to obtain the radio resources allocated by the base station.

The third type: the second UE blindly detects the third radio resource allocation signaling carrying the first UE identification information and the radio resource scheduling identification.

The first UE and the second UE can blindly detect the third radio resource allocation signaling carrying the C-RNTI and DCI format of the first UE at the same time, so as to obtain the radio resource allocated by the base station.

Step S23: the first UE transmits data to the second UE using the radio resources allocated by the base station, and the second UE receives the data transmitted by the first UE using the radio resources allocated by the base station.

Specifically, the above-mentioned first UE transmits data to the second UE using the radio resources allocated by the base station, and the second UE receives the data transmitted by the first UE using the radio resources allocated by the base station. The allocated radio resource transmits data to the second UE, and the second UE receives the data transmitted by the first UE through the physical uplink shared channel according to the radio resource allocated by the base station.

Because in D2D, there is no difference between uplink and downlink when the first UE and the second UE perform data transmission. Here, the PUSCH is used instead of the Physical Downlink Shared Channel (PDSCH) for data transmission, and the main consideration is to reduce the implementation complexity and protocol modification degree of the user equipment as much as possible. Since the user equipment cannot send the downlink common pilot signal, otherwise it will interfere with the common pilot channel of the base station, so the PUSCH is selected for data transmission.

Here, the second UE has the ability to demodulate the uplink pilot signal and data. The base station in the LTE system in the prior art has this ability, but the user equipment does not have this ability.

Specifically, after the above step S23, it also includes:

Step S24: the second UE returns a data reception result to the first UE and the base station.

When the second UE receives the data transmitted by the first UE, the reception may be successful or may fail, so the second UE needs to return the data reception result to the first UE and the base station. In the existing LTE system, signaling for ACK/NACK feedback on uplink data is sent through a Physical Hybrid ARQ Indicator Channel (PHICH). Considering that the PHICH cannot be multiplexed well with the PUSCH, the PUCCH is used for transmission. In the LTE system, the PUCCH can carry the ACK/NACK feedback of the downlink data, but its time-frequency position is related to the time-frequency position of the PDCCH for resource allocation indication for the downlink data. On the other hand, the PDCCH for resource allocation indication for D2D data transmission is sent by the base station one or more subframes before the actual data transmission, so it may happen that the PUCCH carrying D2D connection ACK/NACK information and the ACK carrying ordinary cellular connection The time-frequency positions of the PUCCHs in the /NACK information collide and interfere with each other.

In order to solve the above problems, specifically, the following two methods can be adopted:

In the first type, the second UE sends data reception feedback signaling carrying successful ACK/failure NACK information to the base station through the time and frequency set in the physical uplink control channel.

Here, the base station can specifically reserve the time-frequency position for transmitting data receiving feedback signaling for D2D. When the second UE needs to send data receiving feedback signaling carrying ACK/NACK information to the first UE and the base station, it can directly pass the reserved The time-frequency position can be sent.

In the second type, the second UE sends data reception feedback signaling carrying successful ACK/failure NACK information to the base station through a guard frequency band between frequency division duplex and time division duplex in the physical uplink control channel.

Using the carrier aggregation technology in the LTE-A system, the D2D data is transmitted on the extension carrier (Extension Carrier), and the data of the ordinary cellular network is transmitted on other carriers. In this way, there will be no conflict of PUCCH between the D2D connection and the common cellular network connection. As shown in FIG. 4 , a scenario where this method is used is to use a guard frequency band between Time Division Duplex (TDD) and Frequency Division Duplex (FDD) for D2D data transmission. In the process of implementing D2D resource allocation and data transmission in the present invention, only PDCCH uses downlink resources, and in the carrier aggregation system, PDCCH is transmitted on the common TDD carrier, not on the extended carrier. Therefore, carrying the D2D connection on the extended carrier only occupies uplink resources. Utilizing the guard bandwidth between TDD and FDD uplink frequencies as an extended carrier for transmitting D2D connection data can make full use of the idle resources without causing interference to TDD and FDD common carriers.

Preferably, after the above step S24, it also includes:

Step S25: the first UE determines whether to retransmit data to the second UE device according to the received data reception result.

Specifically, the above-mentioned first UE determines whether to re-transmit data to the second UE device according to the received data reception result, including: the first UE receives the success ACK/failure NACK sent by the second UE through the time and frequency set in the PUCCH Information data reception feedback signaling; or receiving data reception feedback signaling carrying successful ACK/failure NACK information sent by the second UE through the guard frequency band between frequency division duplex and time division duplex in the PUCCH.

The second UE may carry ACK/NACK information in the data reception feedback signaling sent to the base station. When the data reception feedback signaling carries NACK, the first UE may use the base station as a communication link between the first UE and the second UE. The retransmission data reserves the previously allocated radio resources and transmits data to the second UE; when the data reception feedback signaling carries ACK, the first UE does not need to use the base station to reserve for retransmission data between the first UE and the second UE The previously allocated radio resources are used to transmit data to the second UE.

The following uses a specific embodiment to illustrate the above-mentioned specific process of realizing D2D resource allocation and data transmission in the cellular network, as shown in FIG. 5 , the execution steps are as follows:

Step S31: the first UE sends SR control signaling to the base station through the PUCCH.

After the first UE establishes a D2D connection with the second UE, the first UE acts as the data transmitter, and the second UE acts as the data receiver. The first UE wants to transmit data to the second UE, but the base station has no uplink resources for the first UE to send During signaling, the first UE first sends SR control signaling to the base station.

Step S32: After receiving the SR control signaling, the base station allocates a PUSCH for the first UE to send the BSR control signaling.

Step S33: the first UE sends BSR control signaling through the PUSCH allocated by the base station.

Step S34: After receiving the BSR control signaling sent by the first UE, the base station allocates a radio station for the data transmission between the first UE and the second UE according to the CQI of the channel between the first UE and the second UE sent by the PUCCH. resource.

After the D2D connection is established between the first UE and the second UE, the first UE and the second UE will periodically or aperiodically send the CQI of the channel between them to the base station.

Step S35: the base station sends the third radio resource allocation signaling carrying the C-RNTI and DCI format of the first UE to the first UE through the PDCCH.

Here, only the second case among the three cases mentioned in the above step S13 is taken as an example for illustration.

Step S36: The first UE and the second UE blindly detect the third radio resource allocation signaling containing their own C-RNTI and DCI format.

Step S37: the first UE transmits data to the second UE using the radio resources allocated by the base station, and the second UE receives the data transmitted by the first UE using the radio resources allocated by the base station.

Step S38: The second UE sends data reception feedback signaling carrying ACK/NACK information to the base station and the first UE through the time-frequency position of the PUCCH specially reserved by the base station for D2D. When the second UE sends data reception signaling carrying NACK When feedback signaling, execute step S39; when the second UE sends the data reception feedback signaling carrying ACK, execute step S40.

Step S39: the base station reserves previously allocated radio resources for retransmitting data between the first UE and the second UE.

Step S40: the first UE retransmits data to the second UE using the radio resources reserved by the base station, and the second UE receives the data transmitted by the first UE using the radio resources reserved by the base station.

Step S41: the second UE successfully receives the data, and the procedure ends.

It is assumed here that after the first UE retransmits data to the second UE, the second UE can successfully receive it. In actual situations, if the second UE still cannot successfully receive the data transmitted by the first UE, it can loop steps S37 to Step S39 until the second UE successfully receives the data transmitted by the first UE.

Based on the above-mentioned method for implementing D2D resource allocation in a cellular network provided by the embodiment, an embodiment of the present invention provides an apparatus for implementing D2D resource allocation in a cellular network, which can be set in a base station or other network equipment for implementing D2D resource allocation , its structure is shown in Figure 6, including:

The first receiving unit 11 is configured to receive a data transmission request sent by a first user equipment UE; wherein, a device-to-device communication D2D connection has been established between the first UE and the second UE.

The resource allocation unit 12 is configured to allocate radio resources for data transmission between the first UE and the second UE according to the received data transmission request.

The first sending unit 13 is configured to send the radio resource allocation result to the first UE and/or the second UE.

Specifically, the above-mentioned first receiving unit 11 is specifically configured to: receive buffer status report control signaling sent by the first UE through the physical uplink shared channel.

Specifically, the above-mentioned resource allocation unit 12 is specifically configured to: monitor and receive the channel quality indication information of the channel between the first UE and the second UE sent through the physical uplink control channel; judge the first UE according to the received channel quality indication information The radio resource channel quality between a UE and the second UE, and allocate radio resources for the first UE and the second UE according to the judged radio resource channel quality.

Specifically, the above-mentioned first sending unit 13 is specifically configured to: send the first radio resource allocation signaling carrying the first UE identification information to the first UE through a physical downlink control channel, and send the first radio resource allocation signaling carrying the second UE identification information to the first UE. Send the second radio resource allocation signaling to the second UE; or send the third radio resource allocation signaling carrying the first UE identification information and the radio resource scheduling identification to the first UE through the physical downlink control channel; or send the third radio resource allocation signaling to the first UE through the physical downlink control channel Send the fourth radio resource allocation signaling carrying the identification information of the second UE and the radio resource scheduling identification to the second UE.

Preferably, the above-mentioned device for implementing D2D resource allocation in a cellular network further includes: a first determining unit 14 .

Specifically, the above-mentioned first receiving unit 11 is further configured to receive a data reception result returned by the second UE after receiving the data transmitted by the first UE using the radio resources allocated by the base station.

The above-mentioned first determination unit 14 is configured to determine whether to reserve the allocated wireless resource for retransmission of data between the first UE and the second UE according to the received data reception result, and instruct the resource allocation unit to reserve the allocated wireless resource according to the determined result. resource.

Specifically, the above-mentioned first receiving unit 11 is specifically configured to: receive the data reception feedback signaling carrying successful ACK/failure NACK information sent by the second UE through the time and frequency set in the physical uplink control channel; or receive the second UE Data reception feedback signaling carrying success ACK/failure NACK information sent through the guard frequency band between frequency division duplex and time division duplex in the physical uplink control channel.

Based on the above-mentioned method for implementing D2D data transmission in a cellular network provided by the embodiment, an embodiment of the present invention also provides an apparatus for implementing D2D data transmission in a cellular network, which can be set in a user equipment for implementing D2D data transmission, Its structure is shown in Figure 7, including:

The second sending unit 21 is configured to send a data transmission request to the base station, wherein a device-to-device communication D2D connection has been established between the first UE where it is located and the second UE.

The second receiving unit 22 is configured to receive the radio resource allocation result returned by the base station according to the received data transmission request sent by the second sending unit, wherein the radio resource allocation result includes that the base station provides the first UE with the first UE according to the received data transmission request. Radio resources allocated for data transmission between the second UEs.

The data transmission unit 23 is configured to transmit data to the second UE by using radio resources allocated by the base station.

Specifically, the above-mentioned second sending unit 21 is specifically configured to: send buffer status report control signaling to the base station through the physical uplink shared channel.

Specifically, the above-mentioned second receiving unit 22 is specifically configured to: blindly detect the first radio resource allocation signaling carrying the identification information of the first UE where it is located; or blindly detect the first radio resource allocation signaling carrying the second UE identification information and the radio resource scheduling identification The fourth radio resource allocation signaling; wherein, the first UE and the second UE where they are located obtain peer identification information when establishing a D2D connection.

Specifically, the above-mentioned data transmission unit 23 is specifically configured to: transmit data to the second UE through the physical uplink shared channel according to the radio resource allocated by the base station.

Preferably, the second receiving unit 22 is further configured to: receive a data reception result returned by the second UE after receiving the data transmitted by the data transmission unit.

Specifically, the above-mentioned second receiving unit 22 is specifically configured to: receive the data reception feedback signaling carrying successful ACK/failure NACK information sent by the second UE through the time-frequency set in the physical uplink control channel; or receive the second UE Data reception feedback signaling carrying success ACK/failure NACK information sent through the guard frequency band between frequency division duplex and time division duplex in the physical uplink control channel.

Preferably, the above-mentioned device for implementing D2D data transmission in a cellular network further includes: a second determination unit 24, configured to determine whether to re-transmit data to the second UE device according to the received data reception result, and according to the determined result Instructs the data transfer unit to transfer data.

Based on the above-mentioned another method for implementing D2D data transmission in a cellular network provided by the embodiment, the embodiment of the present invention also provides another device for implementing D2D data transmission in a cellular network, which can be set in a device for implementing D2D data transmission In the user equipment, its structure is shown in Figure 8, including:

The third receiving unit 31 is configured to receive the radio resource allocation result returned by the base station according to the received data transmission request sent by the first user equipment UE, wherein a device-to-device has been established between the second UE where it is located and the first UE The communication D2D connection; the radio resource allocation result includes radio resources allocated by the base station for data transmission between the second UE where it is located and the first UE.

The data receiving unit 32 is configured to use radio resources allocated by the base station to receive data transmitted by the first UE.

Specifically, the above-mentioned third receiving unit 31 is specifically configured to: blindly detect the second radio resource allocation signaling that carries its own identification information; or blindly detect the third radio resource allocation that carries the first UE identification information and the radio resource scheduling identifier Signaling; wherein, the first UE and the second UE where it is located obtain peer identification information when establishing a D2D connection.

Specifically, the above-mentioned third receiving unit 31 is specifically configured to: receive the data transmitted by the first UE through the physical uplink shared channel according to the radio resources allocated by the base station.

Preferably, the above-mentioned device for implementing D2D data transmission in a cellular network further includes: a third sending unit 33, configured to return a data reception result after receiving data transmitted by the first UE to the first UE and the base station.

Specifically, the above-mentioned third sending unit 33 is specifically configured to: send data reception feedback signaling carrying successful ACK/failure NACK information to the base station through the time-frequency set in the physical uplink control channel; The guard frequency band between frequency division duplex and time division duplex in the channel sends data reception feedback signaling carrying successful ACK/failure NACK information to the base station.

When the device for implementing D2D data transmission in the cellular network in the UE includes the units shown in Figure 7, it can be used as the first UE; when the device for implementing D2D data transmission in the cellular network in the UE includes the units shown in Figure 8 Each of the units shown can be used as a second UE. When the device for implementing D2D data transmission in the cellular network in the UE includes the units shown in Fig. 7 and Fig. 8, it can be used for the first UE or as the second UE. In other words, the UE may only include the device shown in Figure 7 as the first UE, may only include the device shown in Figure 8 as the second UE, or may include both the device shown in Figure 7 and the device shown in Figure 8 The device is used as the first UE and/or the second UE.

Based on the above-mentioned method for implementing D2D resource allocation and data transmission in a cellular network provided by the embodiment, an embodiment of the present invention further provides a communication system, including:

At least one above-mentioned base station, and at least two user equipments including the device for realizing D2D data transmission in the cellular network as shown in FIG. 7 and the device for realizing D2D data transmission in the cellular network as shown in FIG. 8 .

At least one of the above-mentioned base stations, at least one user equipment including the device for realizing D2D data transmission in the cellular network as shown in FIG. 7 or 8, and at least one user equipment including the device for realizing D2D data transmission in the cellular network as shown in FIG. 7 and the user equipment of the device for implementing D2D data transmission in a cellular network as shown in FIG. 8 .

At least one of the above-mentioned base stations, at least one user equipment including the device for realizing D2D data transmission in the cellular network as shown in FIG. 7 , and at least one user equipment including the device for realizing D2D data transmission in the cellular network as shown in FIG. 8 user equipment.

In short, the communication system in this embodiment includes: at least one of the above-mentioned base stations and at least two user equipments; wherein, the user equipment serving as the data transmission party at least includes the D2D data transmission in the cellular network as shown in FIG. 7 The apparatus, the user equipment as the data receiver at least includes the apparatus for implementing D2D data transmission in the cellular network as shown in FIG. 8 .

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (29)

1. the method realizing the distribution of D2D resource in cellular networks, it is characterised in that including:

Base station receives the data transfer request that first user equipment UE sends；Wherein, between described UE and the two UE, built vertical device-to-device communication D2D connects；

It is that the sub data transmission between UE and the two UE joins Radio Resource according to the data transfer request received, and Radio Resource allocation result is sent to a UE and/or the 2nd UE, wherein, it is that the sub data transmission between UE and the two UE joins Radio Resource according to the data transfer request received, specifically includes: base station monitoring receives the channel quality indication (CQI) information of UE and the two UE channel therebetween sent by Physical Uplink Control Channel；Judge the radio resource channel quality between a UE and the 2nd UE according to the channel quality indication (CQI) information received, and be a UE and the two UE distributing radio resource according to the radio resource channel quality judged；Radio Resource allocation result is sent to a UE or the 2nd UE, specifically includes: the 3rd Radio Resource assignment signalling carrying a UE identification information and wireless resource scheduling mark is sent to a UE by Physical Downlink Control Channel by base station；Or the 4th Radio Resource assignment signalling carrying the 2nd UE identification information and wireless resource scheduling mark is sent to the 2nd UE by Physical Downlink Control Channel by base station。

2. the method for claim 1, it is characterised in that described base station receives the UE data transfer request sent, and specifically includes:

Base station is received the UE buffer status report sent by Physical Uplink Shared Channel and controls signaling。

3. the method for claim 1, it is characterised in that Radio Resource allocation result is sent to after a UE and/or the 2nd UE by described base station, also includes:

Base station receives the 2nd UE and receives the data receiver result returned after a UE uses the data of the radio resource transfer of base station distribution, determines whether to be again transmit data between UE and the two UE to retain the described Radio Resource of distribution according to the described data receiver result received。

4. method as claimed in claim 3, it is characterised in that described base station receives the 2nd UE and receives the data receiver result returned after a UE uses the data of the radio resource transfer of base station distribution, specifically includes:

Base station receives the 2nd UE data receiver feedback signaling carrying successfully ACK/ failure nack message sent by the time-frequency set in Physical Uplink Control Channel；Or

Base station reception the 2nd UE passes through the data receiver feedback signaling carrying successfully ACK/ failure nack message of the guard band transmission in Physical Uplink Control Channel between FDD and time division duplex。

5. the method realizing the transmission of D2D data in cellular networks, it is characterised in that including:

First user equipment UE sends data transfer request to base station, and wherein, between described UE and the two UE, built vertical device-to-device communication D2D connects；

Oneth UE and the two UE receives the Radio Resource allocation result that base station returns, wherein, base station is that the sub data transmission between UE and the two UE joins Radio Resource according to the data transfer request received, and described Radio Resource is that described base station is distributed in accordance with the following methods: base station monitoring receives the channel quality indication (CQI) information of UE and the two UE channel therebetween sent by Physical Uplink Control Channel；Judge the radio resource channel quality between a UE and the 2nd UE according to the channel quality indication (CQI) information received, and be a UE and the two UE distributing radio resource according to the radio resource channel quality judged；And described base station sends described Radio Resource allocation result in accordance with the following methods: the 3rd Radio Resource assignment signalling carrying a UE identification information and wireless resource scheduling mark is sent to a UE by Physical Downlink Control Channel by base station；Or the 4th Radio Resource assignment signalling carrying the 2nd UE identification information and wireless resource scheduling mark is sent to the 2nd UE by Physical Downlink Control Channel by base station；

Oneth UE uses the Radio Resource of base station distribution to transmit data to the 2nd UE, and the 2nd UE uses the Radio Resource of base station distribution to receive the data of a UE transmission。

6. method as claimed in claim 5, it is characterised in that a described UE sends data transfer request to base station, specifically includes:

Oneth UE sends buffer status report by Physical Uplink Shared Channel to base station and controls signaling。

7. method as claimed in claim 5, it is characterised in that described UE and the two UE receives the Radio Resource allocation result that base station returns, and specifically includes:

Oneth UE blind Detecting carries the first Radio Resource assignment signalling of self identification information, and the 2nd UE blind Detecting carries the second Radio Resource assignment signalling of self identification information；Or

Oneth UE blind Detecting carries the 2nd UE identification information and the 4th Radio Resource assignment signalling of wireless resource scheduling mark；Wherein, UE and the two UE obtains opposite end identification information when setting up D2D and connecting；Or

2nd UE blind Detecting carries a UE identification information and the 3rd Radio Resource assignment signalling of wireless resource scheduling mark。

8. method as claimed in claim 5, it is characterised in that a described UE uses the Radio Resource of base station distribution to transmit data to the 2nd UE, the 2nd UE uses the Radio Resource of base station distribution to receive the data of a UE transmission, specifically includes:

The Radio Resource that oneth UE is distributed according to base station by Physical Uplink Shared Channel transmits data to the 2nd UE, and the 2nd UE receives the data of a UE transmission by Physical Uplink Shared Channel according to the Radio Resource that base station is distributed。

9. method as claimed in claim 5, it is characterised in that described 2nd UE also includes after using the Radio Resource of base station distribution to receive the data of a UE transmission:

2nd UE returns data receiver result to a UE and base station, specifically includes: the 2nd UE sends, by the time-frequency set in Physical Uplink Control Channel, the data receiver feedback signaling carrying successfully ACK/ failure nack message to base station；Or the 2nd UE sends, by guard band between FDD and time division duplex in Physical Uplink Control Channel, the data receiver feedback signaling carrying successfully ACK/ failure nack message to base station。

10. method as claimed in claim 9, it is characterised in that described 2nd UE is to after a UE and base station return data receiver result, also including:

Oneth UE determines whether again to the 2nd UE equipment transmission data according to the data receiver result received。

11. one kind realizes D2D resource assigned unit in cellular networks, it is characterised in that including:

First receives unit, for receiving the data transfer request that first user equipment UE sends；Wherein, between UE and the two UE, built vertical device-to-device communication D2D connects；

Resource allocation unit, the data transfer request received for basis is that the sub data transmission between UE and the two UE joins Radio Resource；Specifically for: monitoring receives the channel quality indication (CQI) information of UE and the two UE channel therebetween sent by Physical Uplink Control Channel；Judge the radio resource channel quality between a UE and the 2nd UE according to the channel quality indication (CQI) information received, and be a UE and the two UE distributing radio resource according to the radio resource channel quality judged；

First transmitting element, for Radio Resource allocation result being sent to a UE and/or the 2nd UE, specifically include: by Physical Downlink Control Channel, the 3rd Radio Resource assignment signalling carrying a UE identification information and wireless resource scheduling mark is sent to a UE；Or by Physical Downlink Control Channel, the 4th Radio Resource assignment signalling carrying the 2nd UE identification information and wireless resource scheduling mark is sent to the 2nd UE。

12. device as claimed in claim 11, it is characterised in that described first receives unit, specifically for: receive the UE buffer status report sent by Physical Uplink Shared Channel and control signaling。

13. device as claimed in claim 11, it is characterised in that also include: first determines unit；

Described first receives unit, is additionally operable to receive the 2nd UE and receives the data receiver result returned after a UE uses the data of the radio resource transfer of base station distribution；

Described first determines unit, for determining whether to be again transmit data between UE and the two UE to retain the described Radio Resource of distribution according to the described data receiver result received, and described resource allocation unit is indicated to retain the described Radio Resource of distribution according to the result determined。

14. device as claimed in claim 13, it is characterised in that described first receives unit, specifically for:

Receive the 2nd UE data receiver feedback signaling carrying successfully ACK/ failure nack message sent by the time-frequency set in Physical Uplink Control Channel；Or

Receive the 2nd UE data receiver feedback signaling carrying successfully ACK/ failure nack message sent by guard band between FDD and time division duplex in Physical Uplink Control Channel。

15. a base station, it is characterised in that include as arbitrary in claim 11-14 as described in realize D2D resource assigned unit in cellular networks。

16. the device realizing the transmission of D2D data in cellular networks, it is characterised in that including:

Second transmitting element, for sending data transfer request to base station, wherein, between UE and the two UE at self place, built vertical device-to-device communication D2D connects；

Second receives unit, for receiving the Radio Resource allocation result that base station returns according to the data transfer request that the second transmitting element received sends, wherein, it is the Radio Resource that the sub data transmission between UE and the two UE is joined that Radio Resource allocation result includes base station according to the described data transfer request received, and described Radio Resource is that described base station is distributed in accordance with the following methods: base station monitoring receives the channel quality indication (CQI) information of UE and the two UE channel therebetween sent by Physical Uplink Control Channel；Judge the radio resource channel quality between a UE and the 2nd UE according to the channel quality indication (CQI) information received, and be a UE and the two UE distributing radio resource according to the radio resource channel quality judged；Described base station sends described Radio Resource allocation result in accordance with the following methods: the 3rd Radio Resource assignment signalling carrying a UE identification information and wireless resource scheduling mark is sent to a UE by Physical Downlink Control Channel by base station；

Data transmission unit, for using the Radio Resource that base station is distributed to transmit data to the 2nd UE。

17. device as claimed in claim 16, it is characterised in that described second transmitting element, specifically for: send buffer status report by Physical Uplink Shared Channel to base station and control signaling。

18. device as claimed in claim 16, it is characterised in that described second receives unit, specifically for: blind Detecting carries the first Radio Resource assignment signalling of the identification information of a UE at self place；Or blind Detecting carries the 2nd UE identification information and the 4th Radio Resource assignment signalling of wireless resource scheduling mark；Wherein, self place the oneth UE and the two UE obtains opposite end identification information when setting up D2D and connecting。

19. device as claimed in claim 16, it is characterised in that described data transmission unit, specifically for: the Radio Resource distributed according to base station by Physical Uplink Shared Channel transmits data to the 2nd UE。

20. device as claimed in claim 16, it is characterised in that described second receives unit, is additionally operable to: receive the 2nd UE data receiver result returned after the data receiving the transmission of described data transmission unit。

21. device as claimed in claim 20, it is characterised in that described second receives unit, specifically for: receive the 2nd UE data receiver feedback signaling carrying successfully ACK/ failure nack message sent by the time-frequency set in Physical Uplink Control Channel；Or

Receive the 2nd UE data receiver feedback signaling carrying successfully ACK/ failure nack message sent by guard band between FDD and time division duplex in Physical Uplink Control Channel。

22. device as claimed in claim 21, it is characterized in that, also include: second determines unit, for determining whether according to the data receiver result received again to the 2nd UE equipment transmission data, and indicate described data transmission unit transmission data according to the result determined。

23. the device realizing the transmission of D2D data in cellular networks, it is characterised in that including:

3rd receives unit, for receiving the Radio Resource allocation result that base station returns according to the data transfer request that the first user equipment UE received sends, wherein, between 2nd UE and the one UE at self place, built vertical device-to-device communication D2D connects, and described Radio Resource allocation result is that described base station is determined in accordance with the following methods: base station monitoring receives the channel quality indication (CQI) information of UE and the two UE channel therebetween sent by Physical Uplink Control Channel；Judge the radio resource channel quality between a UE and the 2nd UE according to the channel quality indication (CQI) information received, and be a UE and the two UE distributing radio resource according to the radio resource channel quality judged；Described base station sends Radio Resource allocation result in accordance with the following methods: the 4th Radio Resource assignment signalling carrying the 2nd UE identification information and wireless resource scheduling mark is sent to the 2nd UE by Physical Downlink Control Channel by base station；It is the Radio Resource that the sub data transmission between the 2nd UE and the one UE is joined that Radio Resource allocation result includes base station；

Data receipt unit, for using the Radio Resource that base station is distributed to receive the data of a UE transmission。

24. device as claimed in claim 23, it is characterised in that the described 3rd receives unit, specifically for: blind Detecting carries the second Radio Resource assignment signalling of self identification information；Or

Blind Detecting carries a UE identification information and the 3rd Radio Resource assignment signalling of wireless resource scheduling mark；Wherein, UE and the two UE obtains opposite end identification information when setting up D2D and connecting。

25. device as claimed in claim 23, it is characterised in that the described 3rd receives unit, specifically for: received the data of a UE transmission according to the Radio Resource that base station is distributed by Physical Uplink Shared Channel。

26. device as claimed in claim 23, it is characterised in that also include: the 3rd transmitting element, for the data receiver result being returned in receiving after the data of a UE transmission to a UE and base station。

27. device as claimed in claim 26, it is characterised in that described 3rd transmitting element, specifically for:

The data receiver feedback signaling carrying successfully ACK/ failure nack message is sent to base station by the time-frequency set in Physical Uplink Control Channel；Or the 2nd UE sends, by guard band between FDD and time division duplex in Physical Uplink Control Channel, the data receiver feedback signaling carrying successfully ACK/ failure nack message to base station。

28. a subscriber equipment, it is characterised in that include as arbitrary in claim 16-22 as described in the device realizing the transmission of D2D data in cellular networks and/or as arbitrary in claim 23-27 described realize the device that D2D data are transmitted in cellular networks。

29. a communication system, it is characterised in that including: at least one base station as claimed in claim 15 and at least two subscriber equipment；

Wherein, as the subscriber equipment of transmission side data at least includes as arbitrary in claim 16-22 as described in the device realizing the transmission of D2D data in cellular networks, as the subscriber equipment of data receiver at least including as arbitrary in claim 23-27 described realize the device that D2D data are transmitted in cellular networks。