WO2015139349A1

WO2015139349A1 - Terminal device-to-device communication method and terminal device-to-device communication system

Info

Publication number: WO2015139349A1
Application number: PCT/CN2014/075623
Authority: WO
Inventors: 曹一卿; 朱亚军; 张云飞; 张晨璐
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2014-03-19
Filing date: 2014-04-17
Publication date: 2015-09-24
Also published as: CN103841649A

Abstract

Provided are a terminal device-to-device communication method and a terminal device-to-device communication system. The terminal device-to-device communication method comprises: allocating, by each base station, a plurality of time-frequency resource combinations used for terminal device-to-device communication to D2D terminals and which are served by the base station, so as to form a resource pool; and allocating, by different base stations, the same resource pool to the D2D terminals which are served by the different base stations to conduct D2D transmission, so as to ensure that the device-to-device communication can be conducted between the D2D terminals served by the different base stations. According to the technical solution of the present invention, the problem that terminals at the edges of adjacent cells cannot communicate because the communication resources are different can be solved.

Description

Terminal direct connection communication method and terminal direct connection communication system

The present invention relates to the field of communications technologies, and in particular, to a terminal direct connection communication method and a terminal direct connection communication system. Background technique

Device to Device (D2D) refers to the terminal not communicating through the network, but the terminal directly communicates. Since the base station does not need to be forwarded, the air interface resources of the mobile network can be saved in a large amount, and the network capacity is further improved. At the same time, D2D is also more robust than existing mobile communication networks, especially in areas where disasters occur or where there is no mobile network coverage.

In the D2D communication process, 3GPP defines two communication resource scheduling modes:

Mode 1: The communication transmission resource of the D2D UE is directly scheduled by the network (base station).

Mode 2: The D2D UE autonomously selects a communication transmission resource in a preset resource pool.

Different designs are designed for D2D UEs and out-of-coverage D2D UEs that are under-coverage:

1. Under network coverage: In order to reduce the impact on the LTE network and ensure the reliability of the transmission, the base station directly allocates resources (mode 1) or specifies a resource pool (mode 2), in which the terminal selects resources for communication. .

2. Network coverage: Since there is no base station, mode 2 communication is usually used.

The UEs outside the network coverage usually forward the "preset scheduling resources" by the UEs under the network coverage. These forwarded UEs are usually at the edge of the network and are called edge-of-coverage UEs.

The edge UE may use the mode 1 and mode 2 resource allocation modes, but regardless of which mode is used, if the base station does not coordinate the scheduling resources, the UEs at the two cell edges may send and receive due to using different resources. It is not possible to communicate with each other. Summary of the invention

The present invention is based on the above technical problems, and proposes a new terminal direct connection communication technology to solve the problem that adjacent cell edge terminals cannot communicate due to using different communication resources.

In view of this, according to an aspect of the present invention, a terminal direct connection communication method is provided, including: each base station allocates a plurality of time-frequency resource combinations for terminal direct-connection communication for a D2D terminal served by the base station to form a resource pool. Different base stations allocate the same resource pool to the D2D terminals they serve for D2D communication to ensure direct communication between D2D terminals served by different base stations.

In the embodiment, when the two D2D terminals are respectively in the area served by different base stations, because the allocated communication resources are different, the direct communication cannot be performed between the two D2D terminals. To solve the technical problem, in this embodiment, The different base stations are allocated the same time-frequency resources for the D2D terminals, so that different D2D terminals use the same resource pool. Even if the two D2D terminals are allocated the same resources, the direct communication can be performed based on the same resources, thereby solving different D2Ds. The problem that the terminal cannot communicate because of different communication resources.

In the foregoing technical solution, preferably, the D2D terminals served by different base stations to allocate the same resource pool include: the coordination between different base stations allocates the same resource pool to the D2D terminals, or the different resource bases are pre-configured by different base stations.

In order to enable different D2D terminals to be allocated to the same resource pool, different base stations serving the same can coordinate the allocation of the same resource pool for the D2D terminals. Different base stations can use the X2 interface to coordinate the resource pool, or directly for different base stations. Configure the same resource pool without coordination.

In any one of the foregoing technical solutions, the base station sends the resource pool configuration information to the D2D terminal that it serves through RRC signaling.

After determining the resource pool allocated for the D2D terminal, the base station transmits resource pool configuration information to the D2D terminal through RRC signaling (e.g., system information block SIB).

In any one of the foregoing technical solutions, the resource pool configuration information includes at least a time-frequency resource and/or a transmission mode.

In any of the foregoing technical solutions, preferably, the D2D terminal in the network coverage forwards the resource pool configuration information obtained by the D2D terminal to the D2D terminal outside the network coverage. The D2D terminal outside the network coverage cannot receive the resource pool configuration information sent by the base station, so it needs to be covered by the network. The D2D terminal inside forwards the resource pool configuration information it receives to the D2D terminal outside the network coverage.

In any one of the foregoing technical solutions, the base station allocates communication resources to the D2D terminal in the resource pool, specifically: the D2D terminal requests, from the base station, resources for direct communication; The D2D terminal allocates resources for direct communication in the resource pool; the D2D terminal acquires communication resources allocated by the base station, and initiates terminal direct communication to other terminals on the communication resources allocated by the base station.

In an embodiment, after determining the resource pool of the D2D terminal, the base station selects resources for the D2D terminal direct communication from the resource pool, and the D2D terminal acquires the resource selected by the base station, and initiates the resource to the other terminal on the resource. Direct communication.

In any one of the foregoing technical solutions, preferably, the method for the D2D terminal to request, by the D2D terminal, the resource for the direct connection communication includes, but is not limited to: changing the power of the resource request signaling, where the base station sends the resource request signaling The power is compared with the preset threshold to determine whether the resource request is a D2D resource request; or the state of the resource request signaling is increased, and the base station determines, according to the state of the resource request signaling, whether the resource request is a D2D The resource request is sent by the terminal, wherein the resource request of the first time-frequency resource indicates that the D2D resource is requested, and the resource request of the second time-frequency resource indicates that the normal uplink transmission resource is requested; Or the terminal sends a D2D resource request with new signaling.

In any one of the foregoing technical solutions, the base station sends the allocated resource information by using a physical control channel (PDCCH/EPDCCH), where the allocated resource information includes at least one or more of the following: uplink resource allocation, new data indication (NDI), modulation and coding (MCS), redundancy version (RV), frequency hopping, power control, group information for D2D communication.

In any one of the foregoing technical solutions, the method for the base station to allocate resources to the requesting terminal includes: the base station allocates resources for the requesting terminal; the requesting terminal sends a D2D message to the other terminal, where the direct connection message carries the communication control The other terminal obtains the D2D message sent by the requesting terminal according to the blind detection in the resource pool; or, the base station allocates resources for the requesting terminal; the other terminal monitors the allocation information of the base station, and allocates resources according to the allocation information. Receiving the D2D information of the requesting terminal. After the base station allocates resources for the requesting terminal, in one case (the other terminal does not know the resource to which the requesting terminal is allocated), the requesting terminal may carry the communication control information in the sent D2D message, without two transmissions, and other terminals are A blind check in the resource pool to obtain a D2D message sent by the requesting terminal. In another case (the other terminal knows the resource to which the requesting terminal is allocated), the other terminal monitors the allocation information of the base station, and according to the allocation information, it can learn which resource the other terminal performs direct communication on, ie, the allocated resource. The D2D information sent by the requesting terminal is received, and the blind detection mode is not taken.

In any one of the foregoing technical solutions, the D2D terminal selects a resource for the D2D communication in the resource pool, and the method includes: the base station notifying the D2D terminal for a resource pool for D2D communication; and the D2D terminal Selecting resources for D2D communication in the resource pool; the D2D terminal initiates terminal direct communication to other terminals on the selected communication resource.

In another implementation manner, after the base station notifies the resource pool allocated by the D2D terminal, the D2D terminal selects resources for direct communication in the resource pool, and then the D2D terminal sends the selected communication resource to the other terminal. Initiate terminal direct communication.

In any one of the foregoing technical solutions, preferably, the D2D terminal notifies the other terminal by using the control channel; the D2D terminal sends a direct connection message to the other terminal by using the specified transmission mode on the selected resource. And receiving, by the other terminal, the communication control information, and receiving, according to the communication control information, the resource selected by the D2D terminal, where the communication control information includes at least one or more of the following: uplink resource allocation, New data indication, modulation and coding mode, redundancy version, whether frequency hopping, power control, group information of D2D communication.

After the D2D terminal selects the communication resource in the resource pool, it notifies the other terminal with the communication control information by using the control channel, and then sends a direct connection message to the other terminal on the selected communication resource. Since the other terminal is informed of the communication control information in advance, it is possible to receive the direct connection information on the corresponding resource and complete the direct connection communication.

In any one of the foregoing technical solutions, the D2D terminal sends a direct connection message to the other terminal, where the direct connection message carries the communication control information, where the communication control information includes at least one or more of the following: Uplink resource allocation, new data indication, modulation and coding mode, redundancy version, whether frequency hopping, power control, group information of D2D communication; the other terminal blindly detecting and obtaining the D2D message sent by the terminal in the resource pool. In the above embodiment, the D2D terminal first sends communication control information to other terminals, and then sends a direct connection message on the selected resource, and performs the operation twice. In this embodiment, when the D2D terminal sends a direct connection message to other terminals, the direct connection message itself carries the communication control information, and the operation is completed once, but other terminals need to perform blind detection in the resource pool to obtain the straightness sent by the D2D terminal. Even the message.

According to another aspect of the present invention, a terminal direct communication system is further provided, including: a resource allocation unit, located at a base station side, configured to allocate, for a D2D terminal served by a base station, a plurality of time-frequency resources for terminal direct communication Combining, forming a resource pool, wherein D2D terminals served by different base stations have the same resource pool for D2D transmission, so as to ensure direct communication between D2D terminals served by different base stations.

In the above technical solution, preferably, the method further includes: a coordinating unit, located at the base station side, connected to the resource allocation unit, configured to coordinate different base stations, allocate the same resource pool for the D2D terminal, or serve the D2D terminal serving different base stations. Pre-configure the same resource pool.

In any one of the foregoing technical solutions, preferably, the information sending unit is located at the base station side, and sends resource pool configuration information to the D2D terminal served by the base station by using RRC signaling.

In any one of the foregoing technical solutions, the resource pool configuration information includes at least a time-frequency resource and/or a transmission mode. In any one of the foregoing technical solutions, the method further includes: a forwarding unit, located at the terminal side, forwarding the resource pool configuration information obtained by the D2D terminal in the network coverage to the D2D terminal outside the network coverage. Since the D2D terminal outside the network coverage cannot receive the resource pool configuration information sent by the base station, the D2D terminal in the network coverage needs to forward the resource pool configuration information received by the network to the D2D terminal outside the network coverage.

In any one of the foregoing technical solutions, preferably, the method further includes: a first resource selection unit, located at a base station side, in the resource pool, when receiving a resource requested by the D2D terminal for direct communication Allocating resources for direct communication to the D2D terminal; the D2D terminal acquires communication resources allocated by the base station, and initiates terminal direct communication to other terminals on the communication resources allocated by the base station.

In any one of the foregoing technical solutions, the resource allocation unit includes: a determining unit, changing power of the resource request signaling, comparing the power of the resource request signaling with a preset threshold, and determining the resource request Whether it is a D2D resource request, or a state of adding a resource request, determining whether the resource request is a D2D resource request according to a status of the resource request, or when the terminal sends a resource request by using a different time-frequency resource, according to the The time-frequency resource corresponding to the resource request determines whether the D2D resource is requested, where the resource request of the first time-frequency resource indicates that the D2D resource is requested, and the resource request of the second time-frequency resource indicates that the normal uplink transmission resource is requested, or the terminal When the D2D resource request is sent by using new signaling, it is determined according to the new signaling whether it is a D2D resource request.

In any one of the foregoing technical solutions, the resource allocation unit is further configured to send the allocated resource information of the base station by using a physical control channel (PDCCH/EPDCCH), where the allocated resource information includes at least one or more of the following: Uplink resource allocation, new data indication (NDI), modulation and coding scheme (MCS), redundancy version (RV), frequency hopping, power control, group information of D2D communication.

In any one of the foregoing technical solutions, preferably, the method further includes: a first notification unit, located at the terminal side, after the base station allocates resources to the requesting terminal, the requesting terminal passes the The learning unit sends a D2D message to the other terminal, where the direct connection message carries the communication control information, and the other terminal blindly detects the D2D message sent by the requesting terminal in the resource pool; or the listening unit is located at the terminal side, After the base station allocates resources to the requesting terminal, the other terminal monitors the allocation information of the base station by using the monitoring unit, and receives the D2D information of the requesting terminal on the allocated resource according to the allocation information.

In another case (the other terminal knows the resource to which the requesting terminal is allocated), the other terminal monitors the allocation information of the base station, and according to the allocation information, it can learn which resource the other terminal performs direct communication on, ie, the allocated resource. The D2D information sent by the requesting terminal is received, and the blind detection mode is not taken.

In any one of the foregoing technical solutions, preferably, the method further includes: a second resource selection unit, located at the terminal side, after the base station notifies the D2D terminal for the resource pool for D2D communication, selecting in the resource pool A resource for D2D communication; a direct communication unit, located on the terminal side, initiates terminal direct communication to other terminals on selected communication resources.

In any one of the foregoing technical solutions, preferably, the method further includes: a second notification unit, located at the terminal side, notifying the other terminal by using the control channel; and the direct connection communication unit uses the designated resource on the selected resource Transmitting a direct connection message to the other terminal, and the other terminal receiving the communication control information, and receiving, according to the communication control information, a resource selected in the D2D terminal, where the communication control The information includes at least one or more of the following: uplink resource allocation, new data indication, modulation and coding mode, redundancy version, whether frequency hopping, power control, group information of D2D communication.

In any one of the foregoing technical solutions, the direct communication unit is further configured to send a direct connection message of the D2D terminal to the other terminal, where the direct connection message carries communication control And the other terminal is blindly detected in the resource pool to obtain the D2D message sent by the terminal, where the communication control information includes at least one or more of the following: uplink resource allocation, new data indication, modulation and coding mode, Redundant version, whether frequency hopping, power control, group information for D2D communication.

In the above embodiment, the D2D terminal first sends communication control information to other terminals, and then sends a direct connection message on the selected resource, and performs the operation twice. In this embodiment, when the D2D terminal sends a direct connection message to other terminals, the direct connection message itself carries the communication control information, and the operation is completed once, but other terminals need to perform blind detection in the resource pool to obtain the straightness sent by the D2D terminal. Even the message. DRAWINGS

1 shows a schematic diagram of two terminals at the edge of two cells, respectively, according to an embodiment of the present invention;

2 is a schematic flow chart showing a method of direct connection communication of a terminal according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart showing a method of direct connection communication of a terminal according to another embodiment of the present invention; FIG.

FIG. 4 is a schematic flow chart showing a method of direct connection communication of a terminal according to another embodiment of the present invention; FIG.

FIG. 5 is a schematic flow chart showing a method of direct connection communication of a terminal according to another embodiment of the present invention; FIG.

6 is a schematic flow chart showing a method of direct connection communication of a terminal according to still another embodiment of the present invention;

7A is a schematic flow chart showing a method of direct connection communication of a terminal according to still another embodiment of the present invention;

7B is a schematic flow chart showing a method of direct connection communication of a terminal according to still another embodiment of the present invention;

FIG. 8A is a schematic flow chart showing a method of direct connection communication of a terminal according to still another embodiment of the present invention; FIG. 8B is a schematic flow chart showing a method of direct connection communication of a terminal according to still another embodiment of the present invention;

FIG. 9 is a schematic flow chart showing a method of direct connection communication of a terminal according to still another embodiment of the present invention; FIG.

FIG. 10 is a schematic flow chart showing a method of terminal direct communication according to still another embodiment of the present invention; FIG.

Figure 11 shows a schematic block diagram of a terminal direct communication system in accordance with one embodiment of the present invention. detailed description

The above described objects, features and advantages of the present invention will be more fully understood from the following detailed description. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention, but the invention may be practiced in other embodiments other than those described herein. Limitations of specific embodiments.

As shown in Figure 1, two terminals (UE1 and UE2) are located at two different cell edges. When the two terminals perform direct communication, if two base stations (BS1 and BS2) do not coordinate scheduling resources, they will appear. The terminals at the edge of two cells cannot communicate with each other because they use different resources to receive or transmit.

The present invention has been made to solve the above technical problems, and therefore the solutions shown in the following embodiments are employed.

Fig. 2 is a schematic flow chart showing a method of direct connection communication of a terminal according to an embodiment of the present invention.

As shown in FIG. 2, the terminal direct connection communication method according to the embodiment of the present invention may include: Step 202: Each base station allocates a plurality of time-frequency resource combinations for terminal direct-connection communication for the D2D terminal it serves, forming Resource pool; Step 204: Different base stations allocate the same resource pool for the D2D terminals that they serve, for D2D transmission, to ensure direct connection communication between D2D terminals served by different base stations. In the embodiment, when the two D2D terminals are respectively in the area served by different base stations, because the allocated communication resources are different, the direct communication cannot be performed between the two D2D terminals. To solve the technical problem, in this embodiment, The different base stations are allocated the same time-frequency resources for the D2D terminals, so that different D2D terminals use the same resource pool. Even if the two D2D terminals are allocated the same resources, the direct communication can be performed based on the same resources, thereby solving different D2Ds. The problem that the terminal cannot communicate because of different communication resources.

In any of the foregoing technical solutions, preferably, the D2D terminal in the network coverage forwards the resource pool configuration information obtained by the D2D terminal to the D2D terminal outside the network coverage. Since the D2D terminal outside the network coverage cannot receive the resource pool configuration information sent by the base station, the D2D terminal in the network coverage needs to forward the resource pool configuration information received by the network to the D2D terminal outside the network coverage.

In an embodiment, after determining the resource pool of the D2D terminal, the base station from the resource The resource selected for direct communication of the D2D terminal is selected in the pool, and the D2D terminal acquires the resource selected by the base station, and initiates direct communication to other terminals on the resource.

In any one of the foregoing technical solutions, preferably, the base station uses a physical control channel

(PDCCH or EPDCCH) transmitting allocated resource information, where the allocated resource information includes at least one or more of the following: uplink resource allocation, new data indication (NDI), modulation and coding mode

(MCS), redundancy version (RV), whether frequency hopping, power control, group information for D2D communication.

In any one of the foregoing technical solutions, the method for the base station to allocate resources to the requesting terminal includes: the base station allocates resources for the requesting terminal; the requesting terminal sends a D2D message to the other terminal, where the direct connection message carries the communication control The other terminal obtains the D2D message sent by the requesting terminal according to the blind detection in the resource pool; or, the base station allocates resources for the requesting terminal; the other terminal monitors the allocation information of the base station, and allocates resources according to the allocation information. Receiving the D2D information of the requesting terminal.

After the base station allocates resources for the requesting terminal, in one case (the other terminal does not know the resource to which the requesting terminal is allocated), the requesting terminal may carry the communication control information in the sent D2D message, without two transmissions, and other terminals are A blind check in the resource pool to obtain a D2D message sent by the requesting terminal. In another case (the other terminal knows the resource to which the requesting terminal is allocated), the other terminal monitors the allocation information of the base station, and according to the allocation information, it can learn which resource the other terminal performs direct communication on, ie, the allocated resource. The D2D information sent by the requesting terminal is received, and the blind detection mode is not taken.

In any one of the foregoing technical solutions, preferably, the D2D terminal is selected in the resource pool for The D2D communication resource includes: the base station notifying the D2D terminal for a resource pool for D2D communication; the D2D terminal selecting a resource for D2D communication in the resource pool; the D2D terminal is selected The terminal directly communicates with other terminals on the communication resource.

In any one of the foregoing technical solutions, the D2D terminal sends a direct connection message to the other terminal, where the direct connection message carries the communication control information, where the communication control information includes at least one or more of the following: Uplink resource allocation, new data indication, modulation and coding mode, redundancy version, whether frequency hopping, power control, group information of D2D communication; the other terminal blindly detecting and obtaining the D2D message sent by the terminal in the resource pool.

In the above embodiment, the D2D terminal first sends communication control information to other terminals, and then sends a direct connection message on the selected resource, and performs the operation twice. In this embodiment, when the D2D terminal sends a direct connection message to other terminals, the direct connection message itself carries the communication control information, and the operation is completed once, but other terminals need to perform blind detection in the resource pool to obtain the straightness sent by the D2D terminal. Even the message.

Fig. 3 is a schematic flow chart showing a method of direct connection communication of a terminal according to another embodiment of the present invention.

Step 302: The base station (BS) allocates resources for the D2D request resource to the D2D UE1. Step 304: The D2D UE1 sends a communication resource request on the resource specified by the base station.

Step 306: The base station responds to the resource allocation request of the D2D UE1 by allocating resources for communication.

Step 308: The D2D UE1 initiates direct communication to the D2D UE2 on the resource allocated by the base station. In step 304, the method for the D2D UE1 to request the resource for the direct connection communication from the base station includes, but is not limited to: using the existing terminal uplink scheduling request signaling SR (Scheduling Request), but changing the power of the resource request signaling The base station compares the power of the resource request signaling with the preset threshold. When the received power is greater than the preset threshold 1 but less than the preset threshold 2, the terminal determines that the terminal requests the common resource, and when the received power is greater than the preset threshold 2, the terminal is determined as the terminal. Requesting the D2D resource; or increasing the status of the resource request: The current SR is set to 1 bit. To distinguish the normal uplink scheduling request from the D2D scheduling request, the SR is set to 2 bits, and the different states of the SR are used to indicate the uplink scheduling request and the D2D, respectively. The D2D UE1 uses the same transmission and decision method as the SR, but uses a time-frequency resource different from the normal uplink scheduling request to send a D2D resource request, where the resource request of the first time-frequency resource indicates that the D2D resource is requested. The resource request of the second time-frequency resource indicates that the normal uplink transmission resource is requested; Or D2D UE1 redesigns the signaling SR-D2D, and sends a D2D resource request with new signaling, and the occupied resources are notified or pre-configured by the base station through RRC signaling.

It should be noted that, only when the D2D UE1 requests the base station to request the resources for the direct communication by redesigning the signaling SR_D2D and the occupied resources are notified by the base station through the RRC signaling, the step 302 is required. Other methods of requesting resources listed above do not require step 302.

The risk of the direct connection communication method shown in FIG. 3 is that the D2D UE2 may not be aware of the resources that the D2D UE1 initiates communication, and thus may miss the message sent by the D2D UE1. In order to solve this problem, the BS may use the method in FIG. 4 to allocate the same resources to the D2D UE2 and other UEs that need to receive the D2D UE1 message (steps 408 and 410) to ensure that the message sent by the D2D UE1 may be owned by the other. The D2D UE receives.

As shown in FIG. 4, D2D UE1, D2D UE2, and D2D UEk are all in the area i or within the same base station service.

Step 402: The base station allocates resources for requesting resources by the D2D UE1. Step 404, D2D UE2 requests communication resources on resources designated by the base station. Step 406: The base station allocates communication resources for the D2D UE1, and the other D2D UEs monitor resource allocation information. Step 408: The D2D UE1 initiates communication on the resource allocated by the base station.

It should be noted that if other D2D terminals do not receive the communication resources allocated for the D2D UE1 (other D2D UEs may be in a dormant state of discontinuous reception without receiving the allocated communication resource information), it may not be able to correctly receive the D2D UE1 transmission. Information. Therefore, other D2D UEs need to blindly detect possible D2D messages in the set D2D communication resource pool, and the D2D message also needs to carry corresponding control information, and the control information includes one or more of the following information: uplink resource allocation, New data indication (NDI), modulation and coding (MCS), redundancy version (RV), frequency hopping, power control, group information for D2D communication. FIG. 4 can solve the resource allocation problem of D2D UE communication in the same BS, but when the D2D UE belongs to different cells, when there are communication resources allocated by different BSs, there is also a problem that the D2D UEs cannot communicate with each other, so when resource allocation is needed Resources for D2D UE communication are coordinated by two BSs (or more BSs), and all UEs participating in the same group of D2D communication are allocated the same resources. In order to solve this problem, the present invention proposes an implementation as shown in Fig. 5.

As shown in FIG. 5, the serving base stations of UE2 and UE1 in FIG. 5 are BS2 and BS1, respectively. Step 502: The base station BS1 allocates resources for the D2D UE1 to request resources for the D2D UE1 (this step is the same as step 302 of FIG. 3, and only the method for requesting the resources for the direct connection communication from the D2D UE1 to the base station is to redesign the signaling SR-D2D. And the resources occupied by the base station are notified by the base station through RRC signaling, and this step is only).

Step 504: The D2D UE1 requests communication resources on the resource specified by the base station BS1.

Step 506, the communication resources for the D2D are coordinated between the BS2 and the BS1. It should be understood that, in addition to this, the two base stations can preset the same resource pool in advance. In addition, the timing of coordinating the resource pool or the timing of the preset resource pool may not be the timing shown in Figure 5. It is possible to coordinate the resource pool or the preset resource pool when the last direct communication occurred.

Step 508, BS1 allocates communication resources for D2D UE1, and BS2 allocates communication resources for D2D UE2.

Step 510: The BS2 allocates a communication resource pool to the D2D UE2 of the cell. It should be understood that this step may occur before step 508, or when the last direct communication occurred, BS2 has been The D2D UE2 of the cell allocates a communication resource pool.

Step 512, BS1 allocates communication resources for the D2D UEk.

Step 514: The D2D UE1 initiates direct communication to the D2D UE2 and the D2D UEk on the resources allocated by the base station. In step 506, the coordination between the base stations may be performed by using an X2 interface signaling, where the interface signaling needs to include at least information about the time and frequency location of the resources to be allocated. If semi-persistent scheduling is used, the scheduling period needs to be included. information.

The signaling of the base station in the present embodiment for allocating communication resources to the D2D UE may be in the form of DCI Format 0 (UL Grant) in the PDCCH or EPDCCH, including uplink resource allocation, NDI, MCS, RV version, whether or not frequency hopping, Information such as power control.

For other UEs in the same cell that have not received the communication resources allocated for D2D UE1 (other terminals of the same cell are dormant and not received), the information transmitted by D2D UE1 may not be correctly received. Therefore, other D2D UEs need to blindly detect possible D2D messages in the set D2D communication resource pool, and the message also needs to carry corresponding control information, and the control information includes one or more of the following information: , new data indication (NDI), modulation and coding (MCS), redundancy version (RV), frequency hopping, power control, group information of D2D communication.

In addition, in FIG. 5, D2D UE1 and D2D UEk are in the same 'J, zone, and D2D UE2 is in another cell. In step 512 of FIG. 5, the base station allocates communication resources for the D2D UEk. In another mode, the D2D UEk can monitor the resource information allocated by the D2D UE1, so that the base station does not need to allocate communication resources for the D2D UEk.

In the foregoing embodiments, the base station selects the allocated communication resource, and in the following embodiments, the terminal selects the communication resource in the resource pool, that is, the terminal independently selects the communication resource in the preset resource pool, and initiates the communication. A terminal that does not have a communication request only needs to monitor the preset resources to know whether there is communication information for itself.

As shown in FIG. 6, in step 602, a resource pool for D2D communication is first allocated by the base station to the D2D UE1 and the D2D UE2. The manner of allocating the resources may be periodic broadcast by using RRC signaling, where at least the preset resource pool should be included. The time-frequency location may also include related information such as the effective time of the preset resource pool. Step 604: The D2D UE1 selects a resource in the resource pool allocated by the base station and initiates communication. Other D2D UEs need to detect blindly in the set D2D communication resource pool. The D2D message appears, and the message also needs to carry corresponding control information, including one or more of the following information: uplink resource allocation, new data indication (NDI), modulation and coding mode (MCS), redundancy version (RV) ), whether frequency hopping, power control, group information of D2D communication.

As shown in FIG. 7A, in this embodiment, in step 702, the base station allocates a resource pool for D2D UE transmission control information. The D2D UE selects resources for D2D communication in the resource pool, and then, in step 704, the D2D UE1 sends communication control information for transmitting D2D information to the D2D UE2 and other received D2D UEs, so that the D2D UE2 and other received The D2D UE is capable of receiving D2D information on the corresponding resource.

Step 706: The D2D UE1 sets a D2D message according to the control information, selects a resource in a preset resource pool, and initiates direct communication to the D2D UE2 and other received D2D UEs on the selected resource. That is, the D2D UE1 first transmits communication control information to the D2D UE2, and then transmits a D2D message.

In step 704, the D2D UE selects the resources for the D2D communication and notifies the other D2D UEs, and the manner of notifying the use of the resources may be using a periodic broadcast, where at least the time-frequency location of the preset resource pool should be included, and may also include One or more of the following information: uplink resource allocation, new data indication (NDI), modulation and coding scheme (MCS), redundancy version (RV), frequency hopping, power control, group information of D2D communication.

As shown in FIG. 7B, FIG. 7B differs from FIG. 7A in that step 704 and step 706 in FIG. 7A can be combined to form a new step 708, that is, D2D UE1 directly sends a D2D message to D2D UE2 and carries it in the D2D message. Communication control information, the other steps are the same, and will not be described here.

In FIG. 7A and FIG. 7B, the base stations of the two terminals are the same base station, but if each base station separately allocates the resources of the own cell, the UEs of different cells are difficult to communicate with each other, which requires the adjacent base stations to allocate D2D. Resources are negotiated with each other.

As shown in FIG. 8A, in step 802, BS1 and BS2 first negotiate resources for D2D communication (same as above). If each base station presets a resource pool in advance, the coordination step is not required. Step 804 and step 806, BS1 and BS2 respectively send resource allocation information to the D2D UE of the local cell. Step 808: The D2D UE1 sends a resource configuration for transmitting D2D information. Step 810, The D2D UE1 selects a resource among the resources allocated by the base station and initiates direct connection communication to the D2D UE2. In this way, direct communication can be performed between terminals in different cells.

As shown in FIG. 8B, in step 802, BS1 and BS2 first negotiate resources for D2D communication. As above, if each base station presets a resource pool in advance, the coordination step is not required. Step 804 and step 806, BS1 and BS2 respectively send resource allocation information to the D2D UE of the local cell. Step 812: The D2D UE1 selects a resource among the resources allocated by the base station and initiates direct communication to the D2D UE2 (the transmitted D2D information carries the communication control information). In this way, direct communication can be performed between terminals in different cells.

As shown in FIG. 8A, FIG. 8A differs from FIG. 8B in that, in FIG. 8A, the resource configuration, that is, the communication control information is separately transmitted as one step, and in FIG. 8B, the D2D message is directly transmitted and the communication control is carried in the D2D message. The information, the other steps are the same, and will not be described here.

The D2D UEs outside the network coverage mainly use the same resource pool to communicate, and the preset resource configuration information is forwarded by the UEs in the coverage.

For out-of-band D2D UEs that cannot communicate with D2D UEs within the coverage, communication resources can usually only be configured by the D2D UEs within the coverage. For example, as shown in FIG. 9, step 902, D2D UE0 allocates resources for D2D UE transmission. Step 904: The other UEs (D2D UE1 and D2D UE2) select resources in the preset resource pool and initiate communication.

When the out-of-coverage D2D UE can communicate with the D2D UE in the coverage, the resource configuration information is usually forwarded by the D2D UE in the coverage, and the out-of-coverage D2D UE selects the resource to initiate communication. As shown in FIG. 10, in step 1002, the D2D UE0 in the coverage forwards the resources for D2D UE transmission to the out-of-coverage D2D UE1 and D2D UE2. Step 1004: The D2D UE1 selects a resource in the resource pool allocated by the base station and initiates direct connection communication. With this technical solution, D2D communication can be performed between UEs covering the inside and outside.

FIG. 11 is a block diagram showing a terminal direct communication system according to an embodiment of the present invention. As shown in FIG. 11, a terminal direct communication system 1100 according to an embodiment of the present invention may include: a resource allocation unit 110A, located at On the base station side, the D2D terminal used for serving the base station allocates a plurality of time-frequency resource combinations for terminal direct-connection communication to form a resource pool, wherein the D2D terminals served by different base stations have the same resource pool for D2D transmission, It can ensure direct communication between D2D terminals served by different base stations. In the embodiment, when the two D2D terminals are respectively in the area served by different base stations, because the allocated communication resources are different, the direct communication cannot be performed between the two D2D terminals. To solve the technical problem, in this embodiment, The different base stations are allocated the same time-frequency resources for the D2D terminals, so that different D2D terminals use the same resource pool. Even if the two D2D terminals are allocated the same resources, the direct communication can be performed based on the same resources, thereby solving different D2Ds. The problem that the terminal cannot communicate because of different communication resources.

In the above technical solution, preferably, the method further includes: a coordinating unit 110B, located at the base station side, connected to the resource allocating unit 110A, configured to coordinate different base stations, allocate the same resource pool for the D2D terminal, or serve the D2D terminal serving different base stations. Pre-configure the same resource pool.

In any one of the foregoing technical solutions, preferably, the information sending unit 110C is located at the base station side, and sends resource pool configuration information to the D2D terminal served by the base station by using RRC signaling.

In any of the above technical solutions, preferably, the resource pool configuration information includes at least a time-frequency resource and/or a transmission mode.

In any one of the foregoing technical solutions, the method further includes: a forwarding unit 110D, located at the terminal side, forwarding the resource pool configuration information obtained by the D2D terminal in the network coverage to the D2D terminal outside the network coverage. Since the D2D terminal outside the network coverage cannot receive the resource pool configuration information sent by the base station, the D2D terminal in the network coverage needs to forward the resource pool configuration information received by the network to the D2D terminal outside the network coverage.

In any one of the foregoing technical solutions, preferably, the first resource selection unit 110E is located at the base station side, and is a D2D terminal in the resource pool when receiving a resource requesting direct communication from the D2D terminal. Allocating resources for direct communication; the D2D terminal acquires communication resources allocated by the base station, and initiates terminal direct communication to other terminals on the communication resources allocated by the base station.

In any one of the foregoing technical solutions, the resource allocation unit 110A includes: a determining unit, changing power of the resource request signaling, comparing the power of the resource request signaling with a preset threshold, and determining the resource. Whether the request is a D2D resource request, or the state of the resource request is increased, and according to the state of the resource request signaling, determining whether the resource request signaling is a D2D resource request, or sending a resource request by using a different time-frequency resource in the terminal And determining, according to the time-frequency resource corresponding to the resource request, whether to request the D2D resource, where the resource request of the first time-frequency resource indicates that the D2D resource is requested, and the resource request of the second time-frequency resource indicates that the normal uplink transmission is requested. The resource, or when the terminal uses the new signaling to send the D2D resource request, determines whether it is a D2D resource request according to the new signaling.

In any one of the foregoing technical solutions, the resource allocation unit 110A is further configured to: use the physical control channel (PDCCH/EPDCCH) to send the allocated resource information of the base station, where the allocated resource information includes at least one or more of the following: : Uplink resource allocation, new data indication (NDI), modulation and coding scheme (MCS), redundancy version (RV), frequency hopping, power control, group information for D2D communication.

In any one of the foregoing technical solutions, the method further includes: a first notification unit 110F, located at the terminal side, after the base station allocates resources for the requesting terminal, the requesting terminal sends the D2D to the other terminal by using the notification unit a message, the direct connection message carries the communication control information, and the other terminal blindly detects the D2D message sent by the requesting terminal in the resource pool; or the listening unit 110G is located at the terminal side, and allocates resources to the requesting terminal at the base station. After that, the other terminal monitors the allocation information of the base station by using the monitoring unit, and receives the D2D information of the requesting terminal on the allocated resource according to the allocation information.

In any one of the foregoing technical solutions, preferably, the method further includes: a second resource selection unit 110H, located at the terminal side, where the base station notifies the D2D terminal for resources for D2D communication After the pool, resources for D2D communication are selected in the resource pool; the direct connection communication unit 1101, located on the terminal side, initiates terminal direct communication to other terminals on the selected communication resource.

In any one of the foregoing technical solutions, preferably, the method further includes: a second notification unit 110J, located at the terminal side, notifying the other terminal by using the control channel; the direct connection communication unit 1101 is on the selected resource, Transmitting a direct connection message to the other terminal by using a specified transmission mode, and receiving, by the other terminal, the communication control information, and receiving, according to the communication control information, a resource selected in the D2D terminal, where The communication control information includes at least one or more of the following: uplink resource allocation, new data indication, modulation and coding mode, redundancy version, whether frequency hopping, power control, group information of D2D communication.

In any one of the foregoing technical solutions, the direct connection communication unit 1101 is further configured to send the direct connection message of the D2D terminal to the other terminal, where the direct connection message carries communication control information, where The other terminal is blindly detected in the resource pool to obtain the D2D message sent by the terminal, where the communication control information includes at least one or more of the following: uplink resource allocation, new data indication, modulation and coding mode, redundancy version, Whether it is frequency hopping, power control, group information of D2D communication.

The foregoing technical solution according to the present invention is described in detail with reference to the accompanying drawings. The problem that the adjacent cell edge UEs cannot communicate due to different communication resources is designed. Embodiments such that neighboring cell edge UEs can complete direct communication through the same communication resource. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A terminal direct connection communication method, comprising:

Each base station allocates a plurality of time-frequency resource combinations for terminal direct-connection communication for the D2D terminal it serves to form a resource pool;

Different base stations allocate the same resource pool to the D2D terminals they serve for D2D transmission, so as to ensure direct communication between D2D terminals served by different base stations.

The terminal direct connection communication method according to claim 1, wherein the different resource stations allocated by the different base stations to the D2D terminals served by the base station include:

The D2D terminals served by the different base stations are allocated the same resource pool, or the same resource pool is pre-configured by different base stations.

The terminal direct connection communication method according to claim 2, wherein the base station transmits resource pool configuration information to a D2D terminal served by the base station through RRC signaling.

The terminal direct connection communication method according to claim 3, wherein the resource pool configuration information includes at least a time-frequency resource and/or a transmission mode.

The terminal direct connection communication method according to claim 3, wherein the D2D terminal in the network overlay forwards the resource pool configuration information obtained by the D2D terminal to the D2D terminal outside the network coverage.

The terminal direct connection communication method according to any one of claims 1 to 5, wherein the base station allocates communication resources to the D2D terminal in the resource pool, which specifically includes:

The D2D terminal requests a resource for direct communication from the base station;

The base station allocates resources for direct communication in the resource pool for the D2D terminal; the D2D terminal acquires the communication resource allocated by the base station, and initiates the terminal directly to other terminals on the communication resource allocated by the base station. Even communication.

The terminal directly connected communication method according to claim 6, wherein the method for the D2D terminal to request the resource for the direct connection communication from the base station includes:

Changing the power of the resource request signaling, the base station comparing the power of the resource request signaling with a preset threshold, and determining whether the resource request is a D2D resource request; or Adding a status of the resource request signaling, the base station determining, according to the status of the resource request signaling, whether the resource request is a D2D resource request; or

The terminal sends a resource request by using a different time-frequency resource, where the resource request of the first time-frequency resource indicates that the D2D resource is requested, and the resource request of the second time-frequency resource indicates that the normal uplink transmission resource is requested; or

The terminal sends a D2D resource request with new signaling.

The terminal direct connection communication method according to claim 6, wherein the base station transmits the allocated resource information by using a physical control channel, and the allocated resource information includes at least one or more of the following:

Uplink resource allocation, new data indication, modulation and coding mode, redundancy version, whether frequency hopping, power control, group information of D2D communication.

The terminal direct connection communication method according to claim 6, wherein the method for the base station to allocate resources to the requesting terminal includes:

The base station allocates resources to the requesting terminal;

The requesting terminal sends a D2D message to other terminals, where the direct connection message carries communication control information,

The other terminal blindly detects and obtains the D2D message sent by the requesting terminal in the resource pool; or

The base station allocates resources for the requesting terminal,

The other terminal monitors the allocation information of the base station, and receives the D2D information of the requesting terminal on the allocated resource according to the allocation information.

The terminal direct connection communication method according to any one of claims 1 to 5, wherein the D2D terminal selects a resource for D2D communication in the resource pool, specifically: the base station notifies the a D2D terminal is used for a resource pool of D2D communication;

The D2D terminal selects resources for D2D communication in the resource pool;

The D2D terminal initiates terminal direct communication to other terminals on the selected communication resource.

The terminal direct connection communication method according to claim 10, wherein the D2D terminal notifies the other terminal to the communication control information by using the control channel;

The D2D terminal sends the specified transmission mode to the other terminal on the selected resource. Send a direct connection message;

And the other terminal receives the communication control information, and receives a direct connection message on the resource selected by the D2D terminal according to the communication control information, where the communication control information includes at least one or more of the following:

The terminal directly connected communication method according to claim 10, wherein the D2D terminal sends a direct connection message to another terminal, where the direct connection message carries communication control information, wherein the communication control information is at least Includes one or more of the following:

Uplink resource allocation, new data indication, modulation and coding mode, redundancy version, whether frequency hopping, power control, group information of D2D communication;

The other terminal blindly detects the D2D message sent by the terminal in the resource pool.

A terminal direct connection communication system, comprising:

a resource allocation unit, located at the base station side, for allocating a plurality of time-frequency resource combinations for terminal direct-connection communication to a D2D terminal served by the base station, forming a resource pool, wherein D2D terminals served by different base stations have the same resource pool, It is transmitted in D2D to ensure direct communication between D2D terminals served by different base stations.

14. The terminal direct communication system according to claim 13, further comprising:

a coordination unit, located at the base station side, connected to the resource allocation unit, configured to coordinate different base stations, allocate the same resource pool for its D2D terminal, or pre-configure the same resource pool for D2D terminals of different base stations .

The terminal direct communication system according to claim 14, further comprising:

The information sending unit is located at the base station side, and sends resource pool configuration information to the D2D terminal served by the base station by using RRC signaling.

The terminal direct communication system according to claim 15, wherein the resource pool configuration information includes at least a time-frequency resource and/or a transmission mode.

The terminal direct communication system according to claim 15, further comprising:

The forwarding unit is located at the terminal side, and forwards the resource pool configuration information obtained by the D2D terminal in the network coverage to the D2D terminal outside the network coverage.

The terminal direct connection communication system according to any one of claims 13 to 17, wherein the method further comprises:

a first resource selection unit, located at the base station side, when the resource from the D2D terminal requesting direct communication is received, the D2D terminal is allocated resources for direct communication in the resource pool;

The D2D terminal acquires communication resources allocated by the base station, and initiates terminal direct communication to other terminals on the communication resources allocated by the base station.

The terminal direct communication system according to claim 18, wherein the resource allocation unit comprises:

The determining unit, changing the power of the resource request signaling, comparing the power of the resource request signaling with a preset threshold, determining whether the resource request is a D2D resource request, or increasing the state of the resource request signaling, according to the The status of the resource request signaling, determining whether the resource request is a D2D resource request, or determining whether to request the D2D resource according to the time-frequency resource corresponding to the resource request, when the terminal sends a resource request by using a different time-frequency resource, The resource request of the first time-frequency resource indicates that the D2D resource is requested, and the resource request of the second time-frequency resource indicates that the normal uplink transmission resource is requested, or when the terminal uses the new signaling to send the D2D resource request, according to the The new signaling determines whether it is a D2D resource request.

The terminal direct communication system according to claim 18, wherein the resource allocation unit is further configured to send the allocated resource information of the base station by using a physical control channel, where the allocated resource information includes at least one of the following or Multiple:

The terminal direct communication system according to claim 18, further comprising:

a first notification unit, located at the terminal side, after the base station allocates resources to the requesting terminal, The requesting terminal sends a D2D message to the other terminal through the notification unit, where the direct connection message carries the communication control information, and the other terminal blindly detects the D2D message sent by the requesting terminal in the resource pool; or

a monitoring unit, located at the terminal side, after the base station allocates resources to the requesting terminal, the other terminal monitors the allocation information of the base station by using the monitoring unit, and receives the D2D of the requesting terminal on the allocated resource according to the allocation information. information.

a second resource selection unit, located at the terminal side, after the base station notifies the D2D terminal for the resource pool for D2D communication, selecting a resource for D2D communication in the resource pool; the direct communication unit is located at the terminal side Initiating terminal direct communication to other terminals on the selected communication resource.

23. The terminal direct communication system according to claim 22, further comprising:

a second notification unit, located at the terminal side, notifying the other terminal of the communication control information by using the control channel;

The direct connection communication unit transmits a direct connection message to the other terminal by using a specified transmission mode on the selected resource, and the other terminal receives the communication control information, and according to the communication control information, the D2D Receiving on the selected resource in the terminal, where the communication control information includes at least one or more of the following:

The terminal direct communication system according to claim 22, wherein the direct connection communication unit is further configured to send a direct connection message of the D2D terminal to the other terminal, in the direct connection message. Carrying the communication control information, the other terminal blindly detecting and obtaining the D2D message sent by the terminal in the resource pool, where the communication control information includes at least one or more of the following: