CN104427486A - A method, device and system for performing a D2D communication in an LTE TDD system - Google Patents
A method, device and system for performing a D2D communication in an LTE TDD system Download PDFInfo
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- CN104427486A CN104427486A CN201310373783.3A CN201310373783A CN104427486A CN 104427486 A CN104427486 A CN 104427486A CN 201310373783 A CN201310373783 A CN 201310373783A CN 104427486 A CN104427486 A CN 104427486A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W—WIRELESS COMMUNICATION NETWORKS
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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
Technical field
The present invention relates to communication technical field, particularly relate to method, the Apparatus and system of D2D communication in a kind of LTE TDD system.
Background technology
D2D(Device-to-Device, device-to-device) communication technology is that a kind of permission directly carries out by reuse pattern resource the new technique that communicates between terminal, D2D technology can increase frequency spectrum efficiency of cellular communication system, reduce terminal transmitted power, solve the problem of wireless communication system frequency spectrum resource scarcity to a certain extent.
During by existing LTE TDD spectrum application in D2D technology; frame structure can comprise the subframe (subframe) of three types: descending sub frame (DL subframe), sub-frame of uplink (UL subframe) and special subframe (Special subframe); wherein, Special subframe comprises ascending pilot channel time slot (UpPTS), translation and protection time slot (GP) and downlink pilot frequency channel time slot (DwPTS).
In the D2D communication technology, a terminal (being referred to as first terminal) can send information at UL subframe to another terminal (being referred to as the second terminal), and accordingly, the second terminal need receive the information from first terminal in UL subframe.Under this D2D communication mode, the second terminal, when UL subframe receives information, needs, according to judging the forward and backward subframe type of this UL subframe, to determine whether needing to reserve certain guard time, for the conversion of uplink and downlink subframe.
As shown in Figure 1, be 7 kinds of uplink-downlink configuration schematic diagrames of frame structure in LTE TDD system.In kind of the uplink-downlink configuration of 7 shown in Fig. 1, UL subframe can be divided into following 4 classes according to the subframe type of front and back:
1st class UL subframe: adjacent last subframe is Special subframe, an adjacent rear subframe is DL subframe, can referred to as SUD class.
2nd class UL subframe: adjacent last subframe is Special subframe, an adjacent rear subframe is UL subframe, can referred to as SUU class.
3rd class UL subframe: adjacent last subframe is UL subframe, an adjacent rear subframe is DL subframe, can referred to as UUD class;
4th class UL subframe: adjacent last subframe is UL subframe, an adjacent rear subframe is UL subframe, can referred to as UUU class.
D2D communication is carried out for above-mentioned 4th class UL subframe, as shown in Figure 2, the situation that three UL subframe are adjacent has been there is in uplink-downlink configuration, suppose that first terminal sends D2D information to the second terminal on UL subframe2, because the second terminal is all in transmission state on UL subframe1 and UL subframe3, therefore, if the second terminal will receive the D2D information from first terminal on UL subframe2, then the second terminal need from the transmission State Transferring of UL subframe1 be accepting state UL subframe2, afterwards, after the second terminal finishes receiving the D2D information of first terminal transmission on UL subframe2, second terminal is converted to the transmission state of UL subframe3 again from the accepting state of UL subframe2.
For the situation of the 1st class UL subframe, the 2nd class UL subframe and the 3rd class UL subframe and the 4th kind of situation similar, when 1st class UL subframe carries out D2D communication, the second terminal has needed once from transmission state to the conversion of accepting state; When 2nd class UL subframe carries out D2D communication, second terminal has needed once from accepting state to the conversion of the state of transmission, and then complete once from transmission state to the conversion of accepting state, when 3rd class UL subframe carries out D2D communication, the second terminal has needed once from transmission state to the conversion of accepting state.
When terminal is from transmission State Transferring to accepting state, or when being converted to transmission state from accepting state, there will be refractory period (transmitter transient period when terminal sending and receiving state switches, TTP) (generally 20us is no more than), the sending and receiving stateful switchover process for terminal is needed to distribute a certain amount of frequency spectrum resource, the sending and receiving stateful switchover process being terminal distributes conversion duration, so that terminal can complete the switching of sending and receiving state in described conversion duration.
But, be cisco unity malfunction when terminal carries out the switching of sending and receiving state in described conversion duration, therefore, if be that each sending and receiving handoff procedure of terminal distributes frequency spectrum resource as conversion duration, then can cause the waste of frequency spectrum resource.
Summary of the invention
The embodiment of the present invention provides D2D in a kind of LTE TDD system method, the Apparatus and system of communication, in order to solve exist in prior art distribute the problem of the frequency spectrum resource waste that frequency spectrum resource causes as conversion duration for terminal sending and receiving handoff procedure.
The embodiment of the present invention is by the following technical solutions:
A method for D2D communication in LTE TDD system, the 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.
In embodiments of the present invention, from preset time slot proportion mode set, two kinds of time slot proportion modes are chosen by base station, and determine identical subframe numbers, and send to first terminal and the second terminal respectively, make the time slot proportion mode that first terminal is corresponding according to the described identification number received, the UL subframe that described subframe numbers is corresponding sends D2D information to described second terminal; Meanwhile, the time slot proportion mode that the second terminal is corresponding according to the described identification number received, the DL subframe that described subframe numbers is corresponding receives the D2D information that described first terminal sends.In this D2D communication process, first terminal sends D2D information all the time on UL subframe, and the second terminal receives D2D information on DL subframe.Thus terminal, without the need to carrying out sending and receiving state handover operation, also just without the need to distributing frequency spectrum resource for sending and receiving state handover operation, when ensureing the normal execution of D2D business, avoids the waste of frequency spectrum resource.
Preferably, 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.
In embodiments of the present invention, suitable time slot proportion mode not only can be chosen in base station from the time slot proportion mode of standard, can be also each terminal other time slot proportion modes self-defining according to resource requirement; Thus the resource requirement that can communicate according to D2D, for terminal chooses suitable time slot proportion mode flexibly.
Preferably, 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.
In embodiments of the present invention, base station can according to the demand of practical communication resource, chooses one or morely to send to the terminal needing to carry out D2D communication from multiple subframe numbers satisfied condition, and realizes the flexible use of frequency spectrum resource.
A method for D2D communication in LTE TDD system, the 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.
In embodiments of the present invention, from preset time slot proportion mode set, two kinds of time slot proportion modes are chosen by base station, and determine identical subframe numbers, and send to first terminal and the second terminal respectively, make the time slot proportion mode that first terminal is corresponding according to the described identification number received, the UL subframe that described subframe numbers is corresponding sends D2D information to described second terminal; Meanwhile, the time slot proportion mode that the second terminal is corresponding according to the described identification number received, the DL subframe that described subframe numbers is corresponding receives the D2D information that described first terminal sends.In this D2D communication process, first terminal sends D2D information all the time on UL subframe, and the second terminal receives D2D information on DL subframe.Thus terminal, without the need to carrying out sending and receiving state handover operation, also just without the need to distributing frequency spectrum resource for sending and receiving state handover operation, when ensureing the normal execution of D2D business, avoids the waste of frequency spectrum resource.
Preferably, 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.
In embodiments of the present invention, suitable time slot proportion mode not only can be chosen in base station from the time slot proportion mode of standard, can be also each terminal other time slot proportion modes self-defining according to resource requirement; Thus the resource requirement that can communicate according to D2D, for terminal chooses suitable time slot proportion mode flexibly.
A kind of base station, this 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.
In embodiments of the present invention, from preset time slot proportion mode set, two kinds of time slot proportion modes are chosen by base station, and determine identical subframe numbers, and send to first terminal and the second terminal respectively, make the time slot proportion mode that first terminal is corresponding according to the described identification number received, the UL subframe that described subframe numbers is corresponding sends D2D information to described second terminal; Meanwhile, the time slot proportion mode that the second terminal is corresponding according to the described identification number received, the DL subframe that described subframe numbers is corresponding receives the D2D information that described first terminal sends.In this D2D communication process, first terminal sends D2D information all the time on UL subframe, and the second terminal receives D2D information on DL subframe.Thus terminal, without the need to carrying out sending and receiving state handover operation, also just without the need to distributing frequency spectrum resource for sending and receiving state handover operation, when ensureing the normal execution of D2D business, avoids the waste of frequency spectrum resource.
Preferably, 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.
In embodiments of the present invention, base station can according to the demand of practical communication resource, chooses one or morely to send to the terminal needing to carry out D2D communication from multiple subframe numbers satisfied condition, and realizes the flexible use of frequency spectrum resource.
A kind of terminal, this 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.
In embodiments of the present invention, from preset time slot proportion mode set, two kinds of time slot proportion modes are chosen by base station, and determine identical subframe numbers, and send to first terminal and the second terminal respectively, make the time slot proportion mode that first terminal is corresponding according to the described identification number received, the UL subframe that described subframe numbers is corresponding sends D2D information to described second terminal; Meanwhile, the time slot proportion mode that the second terminal is corresponding according to the described identification number received, the DL subframe that described subframe numbers is corresponding receives the D2D information that described first terminal sends.In this D2D communication process, first terminal sends D2D information all the time on UL subframe, and the second terminal receives D2D information on DL subframe.Thus terminal, without the need to carrying out sending and receiving state handover operation, also just without the need to distributing frequency spectrum resource for sending and receiving state handover operation, when ensureing the normal execution of D2D business, avoids the waste of frequency spectrum resource.
A system for D2D communication in LTE TDD system, this 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.
In embodiments of the present invention, from preset time slot proportion mode set, two kinds of time slot proportion modes are chosen by base station, and determine identical subframe numbers, and send to first terminal and the second terminal respectively, make the time slot proportion mode that first terminal is corresponding according to the described identification number received, the UL subframe that described subframe numbers is corresponding sends D2D information to described second terminal; Meanwhile, the time slot proportion mode that the second terminal is corresponding according to the described identification number received, the DL subframe that described subframe numbers is corresponding receives the D2D information that described first terminal sends.In this D2D communication process, first terminal sends D2D information all the time on UL subframe, and the second terminal receives D2D information on DL subframe.Thus terminal, without the need to carrying out sending and receiving state handover operation, also just without the need to distributing frequency spectrum resource for sending and receiving state handover operation, when ensureing the normal execution of D2D business, avoids the waste of frequency spectrum resource.
Preferably, 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.
In embodiments of the present invention, base station can according to the demand of practical communication resource, chooses one or morely to send to the terminal needing to carry out D2D communication from multiple subframe numbers satisfied condition, and realizes the flexible use of frequency spectrum resource.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is 7 kinds of uplink-downlink configuration schematic diagrames of frame structure in LTE TDD system in background technology;
Fig. 2 is the time interval resource configuration information schematic diagram of eNodeB, UE1 and UE2 when having occurred in uplink-downlink configuration that three UL subframe are adjacent in background technology;
Fig. 3 is the method step schematic diagram of D2D communication in the embodiment of the present invention one;
Fig. 4 is the schematic diagram carrying out D2D communication in the embodiment of the present invention one in standard Timeslot proportioning mode;
Fig. 5 is the schematic diagram carrying out D2D communication in the embodiment of the present invention one in other time slot proportion modes self-defining;
Fig. 6 is the specific functional modules schematic diagram of base station in the embodiment of the present invention two;
Fig. 7 is the specific functional modules schematic diagram of terminal in the embodiment of the present invention three;
Fig. 8 is the specific functional modules schematic diagram of system in the embodiment of the present invention four.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
In order to solve in D2D communication as conversion duration distributes the problem of the wasting of resources that frequency spectrum resource causes, the embodiment of the present invention proposes a kind of D2D communication mode based on LTE TDD system: by base station from preset time slot proportion mode set, choose two kinds of time slot proportion modes, and determine identical subframe numbers, guarantee that the subframe that described subframe numbers is corresponding is UL subframe in the first time slot proportion mode chosen, DL subframe in the second time slot proportion mode chosen, afterwards, the information sender (i.e. first terminal) that the identification number of the first time slot proportion mode and the described subframe numbers determined send to D2D to communicate by base station, the receiving party's (i.e. the second terminal) sending to D2D to communicate with the described subframe numbers determined the identification number of the second time slot proportion mode, make first terminal and the second terminal when carrying out D2D and communicating, the first time slot proportion mode that first terminal is corresponding according to the described identification number received, the UL subframe that described subframe numbers is corresponding sends D2D information to described second terminal, meanwhile, the second time slot proportion mode that the second terminal is corresponding according to the described identification number received, the DL subframe that described subframe numbers is corresponding receives the D2D information that described first terminal sends.
By above-mentioned D2D communication mode, first terminal and the second terminal are when carrying out D2D and communicating, transmit leg sends D2D information all the time on UL subframe, receiving side terminal receives D2D information on DL subframe, therefore, terminal without the need to carrying out sending and receiving state handover operation, also just without the need to be sending and receiving state handover operation distribute frequency spectrum resource, when ensureing the normal execution of D2D business, avoid the waste of frequency spectrum resource.
It should be noted that, in embodiments of the present invention, described first terminal and the second terminal are all supported and are opened D2D communication function.
In embodiments of the present invention, setting first terminal is the transmit leg in D2D communication, second terminal is the recipient in D2D communication, here first, second is for distinguishing different terminals, terminal itself is not limited, described first terminal also has the ability doing recipient in D2D communication simultaneously, described second terminal also has the ability making transmit leg in D2D communication simultaneously, and the embodiment of the present invention sends D2D information so that the D2D communication mode of the embodiment of the present invention to be described for first terminal to the second terminal.
Described preset time slot proportion mode set comprises: the 7 kinds of standard Timeslot proportioning modes (as shown in Figure 1) defined in LTE TDD system and/or other time slot proportion modes.
Describe the present invention below in conjunction with specific embodiment, but the present invention is not limited to following examples.
Embodiment one:
As shown in Figure 3, be the method step schematic diagram of D2D communication in the embodiment of the present invention one, mainly comprise the following steps:
Step 101: the first time slot proportion mode and the second time slot proportion mode are chosen in base station from preset time slot proportion mode set, and the subframe numbers of these two kinds of time slot proportion modes.
The time slot proportion mode that base station selection is different, but choose identical subframe numbers, and subframe corresponding to the described subframe numbers chosen is sub-frame of uplink in described first time slot proportion mode, is descending sub frame in described second time slot proportion mode, this is because:
On the one hand, described first time slot proportion mode is the time slot proportion mode that the transmit leg first terminal communicated for D2D is chosen, described second time slot proportion mode is the time slot proportion mode that recipient second terminal communicated for D2D is chosen, do not occur when carrying out D2D and communicating receiving in order to ensure first terminal and the second terminal, hair-like state switches, therefore, the state that need send D2D information with first terminal for the frequency spectrum resource carrying out D2D communication of distributing for first terminal adapts, be that the state that need receive D2D information with the second terminal for the frequency spectrum resource carrying out D2D communication of the second terminal distribution adapts, so different time slot proportion modes will be chosen for first terminal and the second terminal.
On the other hand, D2D can be carried out in order to ensure first terminal in same time section with the second terminal to communicate, therefore, first terminal and the second terminal need in the identical subframe of different time-gap proportioning mode, to carry out D2D communicate, so will choose identical subframe numbers for first terminal and the second terminal.
Alternatively, each time slot proportion mode in the set of time slot proportion mode can identify by described base station in advance, determine multipair time slot proportion mode, wherein, a subframe is had at least to be sub-frame of uplink in a time slot proportion mode in often pair of time slot proportion mode wherein, descending sub frame in another time slot proportion mode, when performing this step 101, base station can using a pair time slot proportion mode in the multipair time slot proportion mode determined as the time slot proportion mode chosen, and be respectively in a pair time slot proportion mode chosen, the subframe numbers that the subframe numbers of descending sub frame is chosen as this step 101.
In define in LTE TDD system 7 kinds of standard Timeslot proportioning modes:
Configuration_0 and configuration_1 is a pair time slot proportion mode, wherein, subframe numbers be 4 and 9 subframe be sub-frame of uplink at configuration_0, be descending sub frame at configuration_1;
Configuration_0 and configuration_2 also can be a pair time slot proportion mode, wherein, subframe numbers be 3,4,8 and 9 subframe be sub-frame of uplink at configuration_0, be descending sub frame at configuration_2.
By that analogy, base station can pre-determine multipair time slot proportion mode and subframe numbers.
Step 102: described base station sends identification number and the subframe numbers of described first time slot proportion mode to described first terminal, and sends the identification number of described second time slot proportion mode and identical subframe numbers to the second terminal.
Particularly, described identification number and subframe numbers can be added in described base station in resource indication information, and send to described first terminal and the second terminal respectively, described resource indication information can be radio resource control (Radio Resource Control, RRC) protocol message such as signaling, the embodiment of the present invention does not limit the concrete communication mode between base station and terminal.
Alternatively, base station is, after described first terminal and the second terminal choose the first time slot proportion mode and the second time slot proportion mode, may occur that one or more subframe numbers meets the following conditions:
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.
In the case, the all subframe numbers meeting above condition can be sent to first terminal and the second terminal by described base station respectively, also wherein parton frame number can be sent to first terminal and the second terminal, the embodiment of the present invention does not limit the quantity of the subframe numbers sent.
Step 103: the first time slot proportion mode that first terminal is corresponding according to the described identification number received, the subframe that the described subframe numbers received is corresponding sends D2D information to the second terminal, and the second time slot proportion mode that described second terminal is corresponding according to the described identification number received, the subframe that the described subframe numbers received is corresponding receives the D2D information that described first terminal sends.
The subframe being handed down to the subframe numbers of first terminal corresponding due to base station is sub-frame of uplink in the first time slot proportion mode, the subframe being handed down to the subframe numbers of the second terminal corresponding is descending sub frame in the second time slot proportion mode, therefore, first terminal is without the need to carrying out the switching of sending and receiving state, directly on the sub-frame of uplink of base station instruction, D2D information can be sent to the second terminal, in like manner, second terminal, also without the need to carrying out the switching of sending and receiving state, directly can receive the D2D information that the second terminal sends on the descending sub frame of base station instruction.
In above embodiment one, from preset time slot proportion mode set, two kinds of time slot proportion modes are chosen by base station, and determine identical subframe numbers, and send to first terminal and the second terminal respectively, make first terminal and the second terminal when carrying out D2D and communicating, the time slot proportion mode that first terminal is corresponding according to the described identification number received, the UL subframe that described subframe numbers is corresponding sends D2D information to described second terminal; Meanwhile, the time slot proportion mode that the second terminal is corresponding according to the described identification number received, the DL subframe that described subframe numbers is corresponding receives the D2D information that described first terminal sends.In this D2D communication process, first terminal sends D2D information all the time on UL subframe, and the second terminal receives D2D information on DL subframe.Thus terminal, without the need to carrying out sending and receiving state handover operation, also just without the need to distributing frequency spectrum resource for sending and receiving state handover operation, when ensureing the normal execution of D2D business, avoids the waste of frequency spectrum resource.
Be described below by the scheme of concrete example to the embodiment of the present invention one.
Example 1:
Suppose that base station is according to the 7 kinds of standard Timeslot proportioning modes defined in LTE TDD system, have chosen the second time slot proportion mode that the first time slot proportion mode that identification number is configuration_0 and identification number are configuration_1, shown in Figure 4, subframe numbers be 4 and 9 subframe be sub-frame of uplink in configuration_0, be descending sub frame in configuration_1.
Base station can send resource indication information to first terminal, and { configuration_0, subframe4, subframe9}, base station can send resource indication information { configuration_1, subframe4, subframe9} to the second terminal.Certainly, also can only have subframe4 or subframe9 in the subframe numbers that described base station sends to first terminal and the second terminal, this example 1 is to send subframe4 and subframe9 to be described simultaneously.
First terminal receives { after configuration_0, subframe4, subframe9}, according to the time slot proportion mode of configuration_0, subframe4, subframe9 sends D2D information to the second terminal; Second terminal receives { after configuration_1, subframe4, subframe9}, according to the time slot proportion mode of configuration_1, subframe4, subframe9 receives the D2D information that the second terminal sends.
Example 2:
Base station is that first terminal and the second terminal choose other time slot proportion modes self-defining, as shown in Figure 5, wherein, the identification number of other time slot proportion modes chosen for first terminal is configuration_X, be the identification number of other time slot proportion modes that the second terminal is chosen are configuration_Y, subframe numbers be 3 and 4 subframe be sub-frame of uplink in configuration_X, be descending sub frame in configuration_Y.
Base station can send resource indication information to first terminal, and { configuration_X, subframe3, subframe4}, base station can send resource indication information { configuration_Y, subframe3, subframe4} to the second terminal.Certainly, also can only have subframe3 or subframe4 in the subframe numbers that described base station sends to first terminal and the second terminal, this example 2 is to send subframe3 and subframe4 to be described simultaneously.
First terminal receives { after configuration_X, subframe3, subframe4}, according to the time slot proportion mode of configuration_X, subframe3, subframe4 sends D2D information to the second terminal; Second terminal receives { after configuration_Y, subframe3, subframe4}, according to the time slot proportion mode of configuration_Y, subframe3, subframe4 receives the D2D information that the second terminal sends.
Corresponding to the method for D2D communication in the LTE TDD system that the embodiment of the present invention one provides, the embodiment of the present invention two additionally provides the base station for D2D communication in a kind of LTE TDD system.Following examples two introduce this base station in detail.
Embodiment two:
As shown in Figure 6, be the specific functional modules schematic diagram of base station in the embodiment of the present invention two, mainly comprise:
Determination module 201, 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.
Sending module 202, sends to first terminal for the identification number of described first time slot proportion mode chosen by determination module 201 and subframe numbers, and the identification number of the second time slot proportion mode is sent to the second terminal with identical subframe numbers.
Wherein, the subframe that described subframe numbers is corresponding is sub-frame of uplink in the first time slot proportion mode, be used to indicate the first time slot proportion mode that described first terminal is corresponding according to the described identification number received, the subframe that the described subframe numbers received is corresponding sends D2D information to described second terminal; The subframe that described subframe numbers is corresponding is descending sub frame in the second time slot proportion mode, be used to indicate the second time slot proportion mode that described second terminal is corresponding according to the described identification number received, the subframe that the described subframe numbers received is corresponding receives the D2D information that described first terminal sends.
Preferably, described determination module 201 is 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.
Preferably, described sending module 202 is specifically for sending at least one subframe numbers in the one or more subframe numbers determined to described first terminal and the second terminal.
Corresponding to the method for D2D communication in the LTE TDD system that the embodiment of the present invention one provides, the embodiment of the present invention three additionally provides the terminal for D2D communication in a kind of LTE TDD system.Following examples three introduce this terminal in detail.
Embodiment three:
As shown in Figure 7, be the specific functional modules schematic diagram of terminal in the embodiment of the present invention three, mainly comprise:
Receiver module 301, 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 302, when being sub-frame of uplink for receiving in the time slot proportion mode that described in subframe corresponding to subframe numbers, identification number is corresponding at described receiver module 301, the time slot proportion mode corresponding according to described identification number, the subframe that described subframe numbers is corresponding sends D2D information to other-end, when to receive in the time slot proportion mode that described in subframe corresponding to subframe numbers, identification number is corresponding be descending sub frame to described receiver module, according to time slot proportion mode corresponding to described identification number, the subframe that described subframe numbers is corresponding receives the D2D information that other-end sends.
In above embodiment two, three, from preset time slot proportion mode set, two kinds of time slot proportion modes are chosen by base station determination module, and determine identical subframe numbers, and utilize sending module to send to first terminal and the second terminal respectively, make first terminal and the second terminal when carrying out D2D and communicating, the time slot proportion mode that the described identification number that first terminal receives according to receiver module is corresponding, utilizes communication module to send D2D information to described second terminal on the UL subframe that described subframe numbers is corresponding; Meanwhile, the time slot proportion mode that the described identification number that the second terminal receives according to receiver module is corresponding, utilizes communication module on the DL subframe that described subframe numbers is corresponding, receive the D2D information of described first terminal transmission.In this D2D communication process, first terminal sends D2D information all the time on UL subframe, and the second terminal receives D2D information on DL subframe.Thus terminal, without the need to carrying out sending and receiving state handover operation, also just without the need to distributing frequency spectrum resource for sending and receiving state handover operation, when ensureing the normal execution of D2D business, avoids the waste of frequency spectrum resource.
Corresponding to the method for D2D communication in the LTE TDD system that the embodiment of the present invention one provides, the embodiment of the present invention four additionally provides the system of D2D communication in a kind of LTE TDD system, and following examples four introduce this system in detail.
Embodiment four:
As shown in Figure 8, be the specific functional modules schematic diagram of system in the embodiment of the present invention four, mainly comprise: base station 401, first terminal 402 and the second terminal 403, wherein:
Base station 401, 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 402, and send 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 403.
First terminal 402, for receiving identification number and the subframe numbers of base station 401 transmission, and the first time slot proportion mode corresponding according to the described identification number received, the subframe that the described subframe numbers received is corresponding sends D2D information to described second terminal 403.
Second terminal 403, for receiving identification number and the subframe numbers of base station 401 transmission, and the second time slot proportion mode corresponding according to described identification number, the subframe that the described subframe numbers received is corresponding receives the D2D information that described first terminal 402 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.
Preferably, described base station 401 is specifically for sending at least one subframe numbers in the one or more subframe numbers determined to described first terminal 402 and the second terminal 403;
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.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
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.
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Application publication date: 20150318 |