CN104427486A - A method, device and system for performing a D2D communication in an LTE TDD system - Google Patents

Abstract

The invention discloses a method, a device and a system for performing a D2D communication in an LTE TDD system. The invention mainly includes: selecting, by a base station, two time slot allocations from a preset time slot allocation set, and determining the same subframe number, and transmitting the subframe number to a first terminal and a second terminal, respectively, such that the first terminal transmits, according to the received time slot allocation corresponding to an identification number, D2D information to the second terminal on an UL subframe corresponding to the subframe number; meanwhile, the second terminal transmits, according to the received time slot allocations corresponding to an identification number, D2D information to the first terminal on a DL subframe corresponding to the subframe number. Thus, the terminal does not have to reserve time and frequency resources for switching between receiving and transmitting since there is no need of switching between receiving and transmitting. The invention avoids waste of time and frequency spectrum resources while ensuring a normal execution of a D2D business.

Description

Method, device and system for D2D communication in LTE TDD system

technical field

The present invention relates to the field of communication technologies, in particular to a method, device and system for D2D communication in an LTE TDD system. the

Background technique

D2D (Device-to-Device, device-to-device) communication technology is a new type of technology that allows terminals to communicate directly through multiplexing cell resources. D2D technology can increase the spectrum efficiency of cellular communication systems and reduce terminal transmission power. To a certain extent, it solves the problem of lack of spectrum resources in wireless communication systems. the

When applying the existing LTE TDD spectrum to D2D technology, the frame structure can include three types of subframes: DL subframe, UL subframe and Special subframe ), where the Special subframe includes the Uplink Pilot Channel Time Slot (UpPTS), Conversion Guard Time Slot (GP) and Downlink Pilot Channel Time Slot (DwPTS). the

In D2D communication technology, a terminal (called the first terminal) can send information to another terminal (called the second terminal) in the UL subframe. Correspondingly, the second terminal needs to receive information from the first terminal in the UL subframe. Terminal information. In this D2D communication mode, when the second terminal receives information in the UL subframe, it needs to determine whether a certain protection time needs to be set aside for the conversion of the uplink subframe and the downlink subframe according to the type of the subframe before and after the UL subframe. . the

As shown in Figure 1, it is a schematic diagram of seven uplink and downlink configurations of the frame structure in the LTE TDD system. Among the seven uplink and downlink configurations shown in Figure 1, the UL subframe can be divided into the following four types according to the types of subframes before and after:

Type 1 UL subframe: the adjacent previous subframe is a Special subframe, and the adjacent subsequent subframe is a DL subframe, which can be referred to as the SUD class for short. the

Type 2 UL subframe: The adjacent previous subframe is a Special subframe, and the adjacent subsequent subframe is a UL subframe, which can be referred to as SUU type for short. the

The third type of UL subframe: the adjacent previous subframe is a UL subframe, and the adjacent subsequent subframe is a DL subframe, which can be referred to as UUD for short;

Type 4 UL subframe: the adjacent previous subframe is a UL subframe, and the adjacent subsequent subframe is a UL subframe, which can be referred to as UUU for short. the

Take the above-mentioned fourth type of UL subframe for D2D communication as an example, as shown in Figure 2, three UL subframes are adjacent to each other in the uplink and downlink configuration, assuming that the first terminal sends D2D information to the second terminal on UL subframe2 , since the second terminal is in the sending state on both UL subframe1 and UL subframe3, if the second terminal wants to receive D2D information from the first terminal on UL subframe2, the second terminal needs to switch from the sending state of UL subframe1 to The receiving state on UL subframe2, after that, when the second terminal finishes receiving the D2D information sent by the first terminal on UL subframe2, the second terminal switches from the receiving state of UL subframe2 to the sending state of UL subframe3. the

The case of Type 1 UL subframe, Type 2 UL subframe, and Type 3 UL subframe is similar to case 4. When performing D2D communication on Type 1 UL subframe, the second terminal needs to complete a transition from sending state to receiving State transition; when performing D2D communication on the second type of UL subframe, the second terminal needs to complete a transition from the receiving state to the sending state, and then complete a transition from the sending state to the receiving state. In the third type of UL subframe When performing D2D communication on the Internet, the second terminal needs to complete a transition from the sending state to the receiving state. the

When the terminal transitions from the sending state to the receiving state, or from the receiving state to the sending state, there will be a refractory period (transmitter transient period, TTP) (generally no more than 20us) when the terminal receives and transmits state switching, which needs to be A certain amount of spectrum resources are allocated for the receiving and transmitting state switching process of the terminal, that is, a switching time is allocated for the receiving and transmitting state switching process of the terminal, so that the terminal can complete the switching between receiving and transmitting states within the switching time. the

However, the terminal cannot work normally when switching between receiving and transmitting states within the conversion time length. Therefore, if spectrum resources are allocated as the conversion time length for each reception and transmission switching process of the terminal, it will result in a waste of spectrum resources. . the

Contents of the invention

Embodiments of the present invention provide a method, device and system for D2D communication in an LTE TDD system, which are used to solve the problem of waste of spectrum resources caused by allocating spectrum resources for the switching process of terminal reception and transmission as the switching time in the prior art . the

The embodiment of the present invention adopts following technical scheme:

A method for D2D communication in an LTE TDD system, the method comprising:

The base station sends the identification number and subframe number of the first time slot matching mode selected from the preset time slot matching mode set to the first terminal, and sends the subframe number selected from the time slot matching mode set to the second terminal. The identification number of the second time slot matching method and the same subframe number;

Wherein, the subframe corresponding to the subframe number is an uplink subframe in the first slot allocation mode, and is used to instruct the first terminal to send D2D information to the second terminal on the uplink subframe;

The subframe corresponding to the subframe number is a downlink subframe in the second slot allocation mode, and is used to instruct the second terminal to receive the D2D information sent by the first terminal on the downlink subframe. the

In the embodiment of the present invention, the base station selects two time slot matching methods from the preset time slot matching method set, and determines the same subframe number, and sends them to the first terminal and the second terminal respectively, so that The first terminal sends D2D information to the second terminal on the UL subframe corresponding to the subframe number according to the received time slot matching mode corresponding to the identification number; at the same time, the second terminal sends D2D information to the second terminal according to the received receiving the D2D information sent by the first terminal on the DL subframe corresponding to the subframe number. During this D2D communication process, the first terminal always sends D2D information on the UL subframe, and the second terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to switch between receiving and transmitting states, and does not need to allocate spectrum resources for switching between receiving and transmitting states. This avoids waste of spectrum resources while ensuring normal execution of D2D services. the

Preferably, the set of preset time slot matching methods includes: 7 standard time slot matching methods defined in the LTE TDD system and/or other time slot matching methods. the

In the embodiment of the present invention, the base station can not only select an appropriate time slot allocation method from standard time slot allocation methods, but also customize other time slot allocation methods for each terminal according to resource requirements; thus, it can be based on According to the resource requirements of D2D communication, the terminal can flexibly select the appropriate time slot ratio mode. the

Preferably, the base station sends the subframe number to the first terminal and the second terminal, specifically including:

The base station determines that there is one or more subframe numbers that satisfy: the subframe corresponding to any subframe number in the one or more subframe numbers is an uplink subframe in the first time slot allocation mode, and in the The second time slot allocation mode is a downlink subframe; the base station sends at least one subframe number among the one or more subframe numbers to the first terminal and the second terminal. the

In the embodiment of the present invention, the base station can select one or more subframe numbers from multiple qualified subframe numbers according to actual communication resource requirements and send them to terminals that need to perform D2D communication, so as to realize flexible use of spectrum resources. the

A method for D2D communication in an LTE TDD system, the method comprising:

The first terminal receives the identification number and subframe number of the first time slot allocation mode selected from the preset time slot allocation mode set sent by the base station, and the second terminal receives the second time slot allocation mode sent by the base station The identification number of the mode and the same subframe number, wherein the subframe corresponding to the subframe number is an uplink subframe in the first time slot matching mode, and the subframe corresponding to the subframe number is in the second time slot In the matching mode, it is a downlink subframe;

The first terminal sends D2D information to the second terminal on the uplink subframe, and the second terminal receives the D2D information sent by the first terminal on the downlink subframe. the

In the embodiment of the present invention, the base station selects two time slot matching methods from the preset time slot matching method set, and determines the same subframe number, and sends them to the first terminal and the second terminal respectively, so that The first terminal sends D2D information to the second terminal on the UL subframe corresponding to the subframe number according to the received time slot matching mode corresponding to the identification number; at the same time, the second terminal sends D2D information to the second terminal according to the received The time slot ratio mode corresponding to the identification number, and receive the D2D information sent by the first terminal on the DL subframe corresponding to the subframe number. During this D2D communication process, the first terminal always sends D2D information on the UL subframe, and the second terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to switch between receiving and transmitting states, and does not need to allocate spectrum resources for switching between receiving and transmitting states. This avoids waste of spectrum resources while ensuring normal execution of D2D services. the

Preferably, the set of preset time slot allocation modes includes: seven standard time slot allocation modes defined in the LTE TDD system and/or other time slot allocation modes. the

In the embodiment of the present invention, the base station can not only select an appropriate time slot allocation method from standard time slot allocation methods, but also customize other time slot allocation methods for each terminal according to resource requirements; thus, it can be based on According to the resource requirements of D2D communication, the terminal can flexibly select the appropriate time slot ratio mode. the

A base station, the base station includes:

The determination module is used to select the identification number and subframe number of the first time slot allocation mode and the identification number and the same subframe number of the second time slot allocation mode from the preset time slot allocation mode set, wherein, The subframe corresponding to the subframe number is an uplink subframe in the first time slot allocation mode, and a downlink subframe in the second time slot allocation mode;

A sending module, configured to send the identification number and subframe number of the first time slot matching mode selected by the determining module to the first terminal, and send the identification number and the same subframe number of the second time slot matching mode For the second terminal, it is used to instruct the first terminal to send D2D information to the second terminal on the uplink subframe, and the second terminal receives the information sent by the first terminal on the downlink subframe D2D information. the

In the embodiment of the present invention, the base station selects two time slot matching methods from the preset time slot matching method set, and determines the same subframe number, and sends them to the first terminal and the second terminal respectively, so that The first terminal sends D2D information to the second terminal on the UL subframe corresponding to the subframe number according to the received time slot matching mode corresponding to the identification number; at the same time, the second terminal sends D2D information to the second terminal according to the received receiving the D2D information sent by the first terminal on the DL subframe corresponding to the subframe number. During this D2D communication process, the first terminal always sends D2D information on the UL subframe, and the second terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to switch between receiving and transmitting states, and does not need to allocate spectrum resources for switching between receiving and transmitting states. This avoids the waste of spectrum resources while ensuring the normal execution of D2D services. the

Preferably, the determination module is specifically configured to determine one or more subframe numbers, wherein the subframe corresponding to any subframe number in the one or more subframe numbers is in the first time slot allocation mode is an uplink subframe, and is a downlink subframe in the second time slot allocation mode;

The sending module is specifically configured to send at least one subframe number among the determined one or more subframe numbers to the first terminal and the second terminal. the

In the embodiment of the present invention, the base station can select one or more subframe numbers from multiple qualified subframe numbers according to actual communication resource requirements and send them to terminals that need to perform D2D communication, so as to realize flexible use of spectrum resources. the

A terminal comprising:

The receiving module is used to receive the identification number and subframe number of the time slot matching mode selected from the preset time slot matching mode set sent by the base station;

A communication module, configured to send a D2D subframe to other terminals on the uplink subframe when the receiving module receives that the subframe corresponding to the subframe number is an uplink subframe in the time slot matching mode corresponding to the identification number. information, when the receiving module receives that the subframe corresponding to the subframe number is a downlink subframe in the time slot matching mode corresponding to the identification number, receive D2D information sent by other terminals on the downlink subframe. the

In the embodiment of the present invention, the base station selects two time slot matching methods from the preset time slot matching method set, and determines the same subframe number, and sends them to the first terminal and the second terminal respectively, so that The first terminal sends D2D information to the second terminal on the UL subframe corresponding to the subframe number according to the received time slot matching mode corresponding to the identification number; at the same time, the second terminal sends D2D information to the second terminal according to the received receiving the D2D information sent by the first terminal on the DL subframe corresponding to the subframe number. During this D2D communication process, the first terminal always sends D2D information on the UL subframe, and the second terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to switch between receiving and transmitting states, and does not need to allocate spectrum resources for switching between receiving and transmitting states. This avoids waste of spectrum resources while ensuring normal execution of D2D services. the

A system for D2D communication in an LTE TDD system, the system includes:

The base station is configured to send the identification number and subframe number of the first time slot matching mode selected from the preset time slot matching mode set to the first terminal, and send the subframe number from the time slot matching mode to the second terminal. The identification number and the same subframe number of the second time slot matching mode selected in the set, wherein the subframe corresponding to the subframe number is an uplink subframe in the first time slot matching mode, and in the second time slot matching mode In the slot matching mode, it is a downlink subframe;

The first terminal is configured to receive the identification number and subframe number sent by the base station, and send D2D information to the second terminal on the uplink subframe;

The second terminal is configured to receive the identification number and the subframe number sent by the base station, and receive the D2D information sent by the first terminal on the downlink subframe. the

In the embodiment of the present invention, the base station selects two time slot matching methods from the preset time slot matching method set, and determines the same subframe number, and sends them to the first terminal and the second terminal respectively, so that The first terminal sends D2D information to the second terminal on the UL subframe corresponding to the subframe number according to the received time slot matching mode corresponding to the identification number; at the same time, the second terminal sends D2D information to the second terminal according to the received receiving the D2D information sent by the first terminal on the DL subframe corresponding to the subframe number. During this D2D communication process, the first terminal always sends D2D information on the UL subframe, and the second terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to switch between receiving and transmitting states, and does not need to allocate spectrum resources for switching between receiving and transmitting states. This avoids waste of spectrum resources while ensuring normal execution of D2D services. the

Preferably, the base station is specifically configured to send at least one subframe number in the determined one or more subframe numbers to the first terminal and the second terminal; wherein, the determined one or more subframe numbers satisfy: The subframe corresponding to any subframe number in the one or more subframe numbers is an uplink subframe in the first time slot allocation mode, and a downlink subframe in the second time slot allocation mode. the

In the embodiment of the present invention, the base station can select one or more subframe numbers from multiple qualified subframe numbers according to actual communication resource requirements and send them to terminals that need to perform D2D communication, so as to realize flexible use of spectrum resources. the

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort. the

Fig. 1 is the schematic diagram of 7 kinds of uplink and downlink configurations of the frame structure in the LTE TDD system in the background technology;

Fig. 2 is a schematic diagram of time slot resource configuration information of eNodeB, UE1 and UE2 when three UL subframes are adjacent to each other in the uplink and downlink configuration in the background technology;

FIG. 3 is a schematic diagram of the method steps of D2D communication in Embodiment 1 of the present invention;

4 is a schematic diagram of D2D communication in a standard time slot ratio mode in Embodiment 1 of the present invention;

5 is a schematic diagram of D2D communication in other self-defined time slot ratios in Embodiment 1 of the present invention;

FIG. 6 is a schematic diagram of specific functional modules of the base station in Embodiment 2 of the present invention;

FIG. 7 is a schematic diagram of specific functional modules of the terminal in Embodiment 3 of the present invention;

FIG. 8 is a schematic diagram of specific functional modules of the system in Embodiment 4 of the present invention. the

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. the

In order to solve the problem of resource waste caused by allocating spectrum resources for the conversion duration in D2D communication, the embodiment of the present invention proposes a D2D communication mode based on the LTE TDD system: the base station selects from the preset time slot matching mode set Two timeslot allocation methods, and determine the same subframe number, to ensure that the subframe corresponding to the subframe number is a UL subframe in the selected first time slot allocation method, and in the selected second time slot allocation mode The mode is DL subframe, after that, the base station sends the identification number of the first time slot matching mode and the determined subframe number to the information sender of D2D communication (that is, the first terminal), and the second time slot matching mode The identification number of the mode and the determined subframe number are sent to the information receiver of the D2D communication (that is, the second terminal), so that when the first terminal and the second terminal are performing D2D communication, the first terminal according to the received In the first time slot matching method corresponding to the identification number, the D2D information is sent to the second terminal on the UL subframe corresponding to the subframe number; at the same time, the second terminal receives the second time slot corresponding to the identification number In a time slot matching manner, the D2D information sent by the first terminal is received on the DL subframe corresponding to the subframe number. the

Through the above D2D communication method, when the first terminal and the second terminal are performing D2D communication, the sender always sends D2D information on the UL subframe, and the receiver terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to perform receiving and sending states Switching operation means that there is no need to allocate spectrum resources for the switching operation of receiving and transmitting states, which avoids the waste of spectrum resources while ensuring the normal execution of D2D services. the

It should be noted that, in the embodiment of the present invention, both the first terminal and the second terminal support and enable the D2D communication function. the

In the embodiment of the present invention, it is set that the first terminal is the sender in D2D communication, and the second terminal is the receiver in D2D communication. Here, the first and second are used to distinguish different terminals, and are not specific to the terminal itself. As a limitation, the first terminal also has the ability to act as a receiver in D2D communication, and the second terminal also has the ability to act as a sender in D2D communication. Two terminals send D2D information as an example to illustrate the D2D communication method in the embodiment of the present invention. the

The set of preset time slot allocation modes includes: seven standard time slot allocation modes defined in the LTE TDD system (as shown in FIG. 1 ) and/or other time slot allocation modes. the

The present invention will be described in detail below in conjunction with specific examples, but the present invention is not limited to the following examples. the

Embodiment one:

As shown in Figure 3, it is a schematic diagram of the steps of the D2D communication method in Embodiment 1 of the present invention, which mainly includes the following steps:

Step 101: The base station selects the first time slot allocation mode and the second time slot allocation mode, and the subframe numbers of these two time slot allocation modes from the preset time slot allocation mode set. the

The base station selects different time slot allocation methods, but selects the same subframe number, and the selected subframe corresponding to the subframe number is an uplink subframe in the first time slot allocation method, and in the second In the two-slot ratio mode, it is a downlink subframe, because:

On the one hand, the first time slot matching method is a time slot matching method selected for the first terminal of the sender of D2D communication, and the second time slot matching method is selected for the second terminal of the receiver of D2D communication In order to ensure that the first terminal and the second terminal do not switch between receiving and transmitting states during D2D communication, the spectrum resource allocated for the first terminal for D2D communication needs to be consistent with that of the first terminal. The state of sending D2D information is adapted, and the spectrum resource allocated for the second terminal for D2D communication needs to be adapted to the state of the second terminal receiving D2D information, so different time slots should be selected for the first terminal and the second terminal Matching method. the

On the other hand, in order to ensure that the first terminal and the second terminal can perform D2D communication within the same time period, therefore, the first terminal and the second terminal need to perform D2D communication on the same subframe with different time slot ratios, so The same subframe number should be selected for the first terminal and the second terminal. the

Optionally, the base station may pre-identify each time slot matching mode in the time slot matching mode set, and determine multiple pairs of time slot matching modes, wherein at least one of the time slot matching modes in each pair of time slot matching modes has The frame is an uplink subframe in one of the time slot matching modes, and a downlink subframe in the other time slot matching mode. When performing this step 101, the base station can determine the multiple A pair of time slot allocation modes is used as the selected time slot allocation mode, and the subframe numbers of the uplink and downlink subframes in the selected pair of time slot allocation modes are used as the subframe numbers selected in step 101 . the

Take the seven standard time slot allocation methods defined in the LTE TDD system as an example:

Configuration_0 and configuration_1 are a pair of time slot matching methods, wherein the subframes with subframe numbers 4 and 9 are uplink subframes in configuration_0, and downlink subframes in configuration_1;

configuration_0 and configuration_2 can also be a pair of time slot allocation, wherein the subframes with subframe numbers 3, 4, 8 and 9 are uplink subframes in configuration_0, and downlink subframes in configuration_2. the

By analogy, the base station can pre-determine multiple pairs of time slot allocation modes and subframe numbers. the

Step 102: The base station sends the identification number and subframe number of the first time slot allocation mode to the first terminal, and sends the identification number and the same subframe number of the second time slot allocation mode to the second terminal. subframe number. the

Specifically, the base station may add the identification number and the subframe number to the resource indication information, and send them to the first terminal and the second terminal respectively, and the resource indication information may be a radio resource control protocol (Radio Resource Control , RRC) signaling and other protocol messages, the embodiment of the present invention does not limit the specific communication mode between the base station and the terminal. the

Optionally, after the base station selects the first time slot ratio mode and the second time slot ratio mode for the first terminal and the second terminal, one or more subframe numbers may meet the following conditions:

The subframe corresponding to any subframe number in the one or more subframe numbers is an uplink subframe in the first time slot allocation mode, and a downlink subframe in the second time slot allocation mode. the

In this case, the base station may send all subframe numbers satisfying the above conditions to the first terminal and the second terminal, or may send some of the subframe numbers to the first terminal and the second terminal. The example does not limit the number of subframe numbers to be sent. the

Step 103: The first terminal sends D2D information to the second terminal on the subframe corresponding to the received subframe number according to the first time slot allocation method corresponding to the received identification number, and the first The second terminal receives the D2D information sent by the first terminal in the subframe corresponding to the received subframe number according to the second time slot allocation mode corresponding to the received identification number. the

Since the subframe corresponding to the subframe number issued by the base station to the first terminal is an uplink subframe in the first time slot configuration mode, the subframe corresponding to the subframe number issued to the second terminal is allocated in the second time slot. For example, it is a downlink subframe. Therefore, the first terminal can directly send D2D information to the second terminal on the uplink subframe indicated by the base station without switching between receiving and transmitting states. Similarly, the second terminal does not need to perform receiving 1. The transmission state is switched, that is, the D2D information sent by the second terminal can be directly received on the downlink subframe indicated by the base station. the

In the first embodiment above, the base station selects two time slot matching methods from the preset time slot matching method set, and determines the same subframe number, and sends them to the first terminal and the second terminal respectively, so that When the first terminal and the second terminal are performing D2D communication, the first terminal sends a message to the second terminal on the UL subframe corresponding to the subframe number according to the received time slot ratio corresponding to the identification number D2D information; at the same time, the second terminal receives the D2D information sent by the first terminal on the DL subframe corresponding to the subframe number according to the received time slot matching mode corresponding to the identification number. During this D2D communication process, the first terminal always sends D2D information on the UL subframe, and the second terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to switch between receiving and transmitting states, and does not need to allocate spectrum resources for switching between receiving and transmitting states. This avoids waste of spectrum resources while ensuring normal execution of D2D services. the

The solution of Embodiment 1 of the present invention will be described below through specific examples. the

Example 1:

Assume that the base station selects the first time slot allocation mode with the identification number configuration_0 and the second time slot allocation mode with the identification number configuration_1 according to the seven standard time slot allocation modes defined in the LTE TDD system, as shown in Figure 4 , the subframes with subframe numbers 4 and 9 are uplink subframes in configuration_0, and downlink subframes in configuration_1. the

The base station may send resource indication information {configuration_0, subframe4, subframe9} to the first terminal, and the base station may send resource indication information {configuration_1, subframe4, subframe9} to the second terminal. Of course, the base station may only have subframe4 or subframe9 among the subframe numbers sent by the base station to the first terminal and the second terminal. In Example 1, sending subframe4 and subframe9 at the same time is used as an example for illustration. the

After receiving {configuration_0, subframe4, subframe9}, the first terminal sends D2D information to the second terminal on subframe4 and subframe9 according to the time slot ratio of configuration_0; after the second terminal receives {configuration_1, subframe4, subframe9}, According to the time slot configuration mode of configuration_1, the D2D information sent by the second terminal is received on subframe4 and subframe9. the

Example 2:

The base station selects other self-defined time slot allocation methods for the first terminal and the second terminal, as shown in FIG. The identification numbers of other time slot allocation methods selected by the terminal are configuration_Y, and the subframes with subframe numbers 3 and 4 are uplink subframes in configuration_X, and downlink subframes in configuration_Y. the

The base station may send resource indication information {configuration_X, subframe3, subframe4} to the first terminal, and the base station may send resource indication information {configuration_Y, subframe3, subframe4} to the second terminal. Of course, only subframe3 or subframe4 may be included in the subframe numbers sent by the base station to the first terminal and the second terminal. In Example 2, sending subframe3 and subframe4 at the same time is taken as an example for illustration. the

After receiving {configuration_X, subframe3, subframe4}, the first terminal sends D2D information to the second terminal on subframe3 and subframe4 according to the time slot ratio of configuration_X; after the second terminal receives {configuration_Y, subframe3, subframe4}, According to the time slot configuration mode of configuration_Y, the D2D information sent by the second terminal is received on subframe3 and subframe4. the

Corresponding to the method for D2D communication in the LTE TDD system provided by Embodiment 1 of the present invention, Embodiment 2 of the present invention also provides a base station for D2D communication in the LTE TDD system. The second embodiment below introduces the base station in detail. the

Embodiment two:

As shown in Figure 6, it is a schematic diagram of specific functional modules of the base station in Embodiment 2 of the present invention, mainly including:

The determination module 201 is configured to select the identification number and subframe number of the first time slot allocation mode and the identification number and the same subframe number of the second time slot allocation mode from the preset time slot allocation mode set. the

The sending module 202 is configured to send the identification number and subframe number of the first time slot matching method selected by the determining module 201 to the first terminal, and send the identification number and the same subframe number of the second time slot matching method number is sent to the second terminal. the

Wherein, the subframe corresponding to the subframe number is an uplink subframe in the first time slot allocation mode, which is used to indicate that the first terminal corresponds to the first time slot allocation mode according to the received identification number , sending D2D information to the second terminal on the subframe corresponding to the received subframe number; the subframe corresponding to the subframe number is a downlink subframe in the second time slot allocation mode, and is used for Instructing the second terminal to receive the D2D information sent by the first terminal in the subframe corresponding to the received subframe number according to the second time slot allocation mode corresponding to the received identification number. the

Preferably, the determination module 201 is specifically configured to determine one or more subframe numbers, wherein the subframe corresponding to any subframe number in the one or more subframe numbers is in the first time slot allocation mode is an uplink subframe, and is a downlink subframe in the second time slot allocation mode. the

Preferably, the sending module 202 is specifically configured to send at least one subframe number among the determined one or more subframe numbers to the first terminal and the second terminal. the

Corresponding to the method for D2D communication in the LTE TDD system provided in Embodiment 1 of the present invention, Embodiment 3 of the present invention also provides a terminal for D2D communication in the LTE TDD system. The following embodiment three introduces the terminal in detail. the

Embodiment three:

As shown in Figure 7, it is a schematic diagram of specific functional modules of the terminal in Embodiment 3 of the present invention, mainly including:

The receiving module 301 is configured to receive the identification number and subframe number of the time slot allocation mode selected from the preset time slot allocation mode set sent by the base station. the

The communication module 302 is configured to, when the receiving module 301 receives the subframe corresponding to the subframe number and the time slot matching mode corresponding to the identification number is an uplink subframe, according to the time slot matching method corresponding to the identification number In the method, the D2D information is sent to other terminals on the subframe corresponding to the subframe number, and the subframe corresponding to the identification number is received by the receiving module as a downlink subframe in the time slot matching method , according to the time slot allocation mode corresponding to the identification number, receive the D2D information sent by other terminals on the subframe corresponding to the subframe number. the

In the second and third embodiments above, the base station determining module selects two time slot matching methods from the preset time slot matching method set, and determines the same subframe number, and uses the sending module to send them to the first The terminal and the second terminal, so that when the first terminal and the second terminal are performing D2D communication, the first terminal uses the communication module to perform D2D communication according to the time slot ratio corresponding to the identification number received by the receiving module. Sending D2D information to the second terminal on the corresponding UL subframe; at the same time, the second terminal uses the communication module to record the time slot corresponding to the subframe number according to the time slot ratio corresponding to the identification number received by the receiving module. The D2D information sent by the first terminal is received on the DL subframe. During this D2D communication process, the first terminal always sends D2D information on the UL subframe, and the second terminal receives D2D information on the DL subframe. Therefore, the terminal does not need to switch between receiving and transmitting states, and does not need to allocate spectrum resources for switching between receiving and transmitting states. This avoids waste of spectrum resources while ensuring normal execution of D2D services. the

Corresponding to the method for D2D communication in the LTE TDD system provided in Embodiment 1 of the present invention, Embodiment 4 of the present invention also provides a system for D2D communication in the LTE TDD system. The following Embodiment 4 introduces the system in detail. the

Embodiment four:

As shown in FIG. 8, it is a schematic diagram of specific functional modules of the system in Embodiment 4 of the present invention, mainly including: a base station 401, a first terminal 402, and a second terminal 403, wherein:

The base station 401 is configured to send to the first terminal 402 the identification number and subframe number of the first time slot matching mode selected from the preset time slot matching mode set, and send the subframe number from the time slot matching mode to the second terminal 403. The identification number of the second time slot matching mode selected in the matching mode set and the same subframe number. the

The first terminal 402 is configured to receive the identification number and the subframe number sent by the base station 401, and according to the first time slot allocation method corresponding to the received identification number, in the subframe corresponding to the received subframe number sending the D2D information to the second terminal 403. the

The second terminal 403 is configured to receive the identification number and the subframe number sent by the base station 401, and receive the subframe corresponding to the received subframe number according to the second time slot allocation mode corresponding to the identification number. The D2D information sent by the first terminal 402 is described above. the

Wherein, the subframe corresponding to the subframe number is an uplink subframe in the first time slot allocation mode, and the subframe corresponding to the subframe number is a downlink subframe in the second time slot allocation mode. the

Preferably, the base station 401 is specifically configured to send at least one subframe number in the determined one or more subframe numbers to the first terminal 402 and the second terminal 403;

Wherein, the determined one or more subframe numbers satisfy: the subframe corresponding to any subframe number in the one or more subframe numbers is an uplink subframe in the first time slot ratio mode, and in the In the above-mentioned second time slot allocation mode, it is a downlink subframe. the

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein. the

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a Means for realizing the functions specified in one or more steps of the flowchart and/or one or more blocks of the block diagram. the

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram. the

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart flow or flows and/or block diagram block or blocks. the

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention. the

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 their equivalent technologies, the present invention also intends to include these modifications and variations. the

Claims (10)

1. a method for D2D communication in LTE TDD system, it is characterized in that, described method comprises:

Base station sends identification number and the subframe numbers of the first time slot proportion mode chosen from preset time slot proportion mode set to first terminal, and sends the identification number of the second time slot proportion mode chosen from the set of described time slot proportion mode and identical subframe numbers to the second terminal;

Wherein, the subframe that described subframe numbers is corresponding is sub-frame of uplink in the first time slot proportion mode, is used to indicate described first terminal and sends D2D information to described second terminal on described sub-frame of uplink;

The subframe that described subframe numbers is corresponding is descending sub frame in the second time slot proportion mode, is used to indicate the D2D information that described second terminal receives the transmission of described first terminal on described descending sub frame.

2. the method for claim 1, is characterized in that, described preset time slot proportion mode set comprises: the 7 kinds of standard Timeslot proportioning modes defined in LTE TDD system and/or other time slot proportion modes.

3. the method for claim 1, is characterized in that, described base station sends described subframe numbers to described first terminal and described second terminal, specifically comprises:

Described base station determines that there is one or more subframe numbers meets: the subframe that in described one or more subframe numbers, arbitrary subframe numbers is corresponding is sub-frame of uplink in described first time slot proportion mode, is descending sub frame in described second time slot proportion mode;

Described base station sends at least one subframe numbers in described one or more subframe numbers to described first terminal and the second terminal.

4. a method for D2D communication in LTE TDD system, it is characterized in that, described method comprises:

First terminal receives identification number and the subframe numbers of the first time slot proportion mode chosen from preset time slot proportion mode set that base station sends, and second terminal receive the identification number of the second time slot proportion mode and identical subframe numbers that described base station sends, wherein, the subframe that described subframe numbers is corresponding is sub-frame of uplink in the first time slot proportion mode, and the subframe that described subframe numbers is corresponding is descending sub frame in the second time slot proportion mode;

First terminal sends D2D information to the second terminal on described sub-frame of uplink, and described second terminal receives the D2D information of described first terminal transmission on described descending sub frame.

5. method as claimed in claim 4, it is characterized in that, described preset time slot proportion mode set comprises: the 7 kinds of standard Timeslot proportioning modes defined in LTE TDD system and/or other time slot proportion modes.

6. a base station, is characterized in that, described base station comprises:

Determination module, for identification number and the identical subframe numbers of the identification number of choosing the first time slot proportion mode from preset time slot proportion mode set and subframe numbers and the second time slot proportion mode, wherein, the subframe that described subframe numbers is corresponding is sub-frame of uplink in the first time slot proportion mode, is descending sub frame in the second time slot proportion mode;

Sending module, first terminal is sent to for the identification number of described first time slot proportion mode chosen by determination module and subframe numbers, and the identification number of the second time slot proportion mode is sent to the second terminal with identical subframe numbers, be used to indicate described first terminal and send D2D information to described second terminal on described sub-frame of uplink, described second terminal receives the D2D information that described first terminal sends on described descending sub frame.

7. base station as claimed in claim 6, is characterized in that,

Described determination module, specifically for determining one or more subframe numbers, wherein, the subframe that in described one or more subframe numbers, arbitrary subframe numbers is corresponding is sub-frame of uplink in described first time slot proportion mode, is descending sub frame in described second time slot proportion mode;

Described sending module, specifically for sending at least one subframe numbers in the one or more subframe numbers determined to described first terminal and the second terminal.

8. a terminal, is characterized in that, described terminal comprises:

Receiver module, for receiving identification number and the subframe numbers of the time slot proportion mode chosen from preset time slot proportion mode set that base station sends;

Communication module, when being sub-frame of uplink for receiving subframe corresponding to subframe numbers at described receiver module in the time slot proportion mode that described identification number is corresponding, described sub-frame of uplink sends D2D information to other-end, when to receive subframe corresponding to subframe numbers be descending sub frame to described receiver module in the time slot proportion mode that described identification number is corresponding, described descending sub frame receives the D2D information that other-end sends.

9. a system for D2D communication in LTE TDD system, it is characterized in that, described system comprises:

Base station, for sending identification number and the subframe numbers of the first time slot proportion mode chosen from preset time slot proportion mode set to first terminal, and the identification number of the second time slot proportion mode chosen from the set of described time slot proportion mode and identical subframe numbers is sent to the second terminal, wherein, the subframe that described subframe numbers is corresponding is sub-frame of uplink in the first time slot proportion mode, is descending sub frame in the second time slot proportion mode;

First terminal, for receiving identification number and the subframe numbers of base station transmission, and sends D2D information to described second terminal on described sub-frame of uplink;

Second terminal, for receiving identification number and the subframe numbers of base station transmission, and receives the D2D information of described first terminal transmission on described descending sub frame.

10. system as claimed in claim 9, is characterized in that,

Described base station, specifically for sending at least one subframe numbers in the one or more subframe numbers determined to described first terminal and the second terminal;

Wherein, the described one or more subframe numbers determined meet: the subframe that in described one or more subframe numbers, arbitrary subframe numbers is corresponding is sub-frame of uplink in described first time slot proportion mode, are descending sub frames in described second time slot proportion mode.