WO2014177091A1

WO2014177091A1 - Method for sending broadcast message in d2d communication, and user equipment

Info

Publication number: WO2014177091A1
Application number: PCT/CN2014/077794
Authority: WO
Inventors: 杨瑾; 吴栓栓; 梁枫; 袁明
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-09-27
Filing date: 2014-05-19
Publication date: 2014-11-06
Also published as: CN104519465A

Abstract

Disclosed is a method for sending a broadcast message in D2D communication, comprising: a user equipment (UE) mapping and carrying a broadcast message on a broadcast channel resource of a D2D subframe, and sending same; or the UE mapping and carrying the broadcast message on the broadcast channel resource of the D2D subframe for sending, and sending at least one of the following information on the D2D subframe at the same time: a discovery signal, a synchronizing signal, broadcast control information, a competition detection signal and competition feedback information. Also disclosed at the same time is a UE.

Description

Method for transmitting broadcast message in D2D communication and user equipment

The present invention relates to the field of mobile communication technologies, and in particular, to a method and a user equipment for transmitting a broadcast message in a device-to-device (D2D) communication. Background technique

In a cellular system, when there is a service between two user equipments (UEs), the service data of user equipment 1 (UE1) to user equipment 2 (UE2) is first transmitted to the air interface. The base station 1 is also referred to as an air interface. The base station 1 transmits the user data to the base station 2 through the core network. The base station 2 transmits the service data to the UE2 through the air interface, and the service data transmission of the UE2 to the UE1 is similarly processed. Process. When UE1 and UE2 are located in the same cell, as shown in FIG. 1, although base station 1 and base station 2 are now the same site, namely: base station 1, a data transmission still consumes two radio spectrum resources. .

It can be seen that if UE1 and UE2 are located in the same cell and are close together, then the above-mentioned cellular communication method is obviously not the optimal communication mode. In fact, with the diversification of mobile communication services, for example, social networking, electronic payment, and the like are more and more widely used in wireless communication systems, so that the demand for service transmission between close-range users is increasing. Therefore, the communication mode of D2D has received increasing attention. The so-called D2D communication, as shown in FIG. 2, means that the service data is not forwarded by the base station, and is directly transmitted by the source user equipment to the target user equipment through the air interface. This communication mode has a feature that is distinct from the traditional cellular system communication mode. For users of short-range communication, D2D transmission not only saves wireless spectrum resources, but also reduces the data transmission pressure of the core network. Cellular network-based D2D communication is a new technology that directly communicates between multiple D2D-enabled terminal devices under the control of the system, which can reduce system resources. Occupancy, increase the spectrum efficiency of the cellular communication system, reduce the transmission power consumption of the terminal, and save network operation costs to a large extent.

In a wireless communication network that introduces a D2D function, each UE can serve as a source transmitting end to transmit D2D communication data to other surrounding UEs, including unicast messages, multicast messages, broadcast messages, and the like. In a traditional cellular communication network, a broadcast message can only be transmitted by a network side node to a UE, and a UE cannot transmit a broadcast message. In D2D communication, any UE can serve as a source of information in a broadcast or unicast manner with surrounding The UE performs the data exchange and transmits the broadcast message through the UE, so as to achieve efficient transmission of information, improve network flexibility, or further implement unicast communication between D2D UEs based on the broadcast transmission method, and provide specific scenarios for public security and the like. Sexual solution. Since the UE does not have the function of transmitting a broadcast message in the conventional communication network, and therefore does not provide a corresponding method for transmitting the broadcast message to the UE, this document provides a solution to this problem. Summary of the invention

In order to solve the existing technical problem, an embodiment of the present invention provides a method for transmitting a broadcast message and a user equipment in D2D communication.

The embodiment of the invention provides a method for transmitting a broadcast message in D2D communication, and the method includes:

The UE maps the broadcast message to the Broadcast Channel resource of the D2D subframe and sends the broadcast message; or

The UE transmits the broadcast message map to the Broadcast Channel resource of the D2D subframe for transmission, and simultaneously transmits at least one of the following information on the D2D subframe: the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback information. .

The discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback information are respectively mapped and transmitted on the discovery channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, and the competitive feedback channel. . The Broadcast Channel resource is:

All available symbols of the D2D subframe included in the time domain, k subcarriers included in the frequency domain; or

All available symbols in a time slot slot contained in the time domain, k subcarriers contained in the frequency domain or

m symbols included in the time domain, all broadcast service available subcarriers included in the frequency domain. The available symbols of the Broadcast Channel resource include all symbols in the D2D subframe or in each slot except the following symbols:

Time interval The symbol where the GP is located, the symbol where the channel is found, the symbol where the synchronization channel is located, the symbol where the broadcast control channel is located, the symbol where the contention channel is located, and the symbol of the competition feedback channel.

The number of symbols of the Broadcast Channel resource in the time domain is: a fixed value set by the system; or an m value indicated by the network side configuration.

The number of subcarriers included in the frequency domain of the broadcast channel resource is: a fixed value set by the system; or, determining a k value according to the number N of available subcarriers of the broadcast service; or, indicated by the network side configuration The k value, where N, k takes a positive integer.

The k value is determined according to the number N of available subcarriers, and is:

When N is less than or equal to 120, k is equal to an integer multiple of 12 or 12;

When N is greater than 120 and less than or equal to 312, k is equal to an integer multiple of 24 or 24; when N is greater than 312 and less than or equal to 756, k is equal to an integer multiple of 36 or 36; when N is greater than 756, k is equal to 48 or 48 Integer multiple.

In the above solution, the Broadcast Channel resource is pre-configured by the system, or configured by the UE on the network side, or obtained by the UE through resource competition.

The network side configures a Broadcast Channel resource for the UE, which is:

The network side semi-statically indicates the Broadcast Channel resource configured by the UE through the high layer signaling; or the broadcast configured by the UE through the physical layer signaling dynamic indication or the semi-static indication.

Channel resources. The resources of the discovery channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, and the competitive feedback channel are:

One or two symbols included in the time domain, and S subcarriers included in the frequency domain, where the S is a fixed value set by the system, or is indicated by a network side configuration, where S is a positive integer.

The resources of any two or more channels in the discovery channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, and the competitive feedback channel are different in the time domain; or the discovery In the channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, and the competitive feedback channel, resources of any two or more channels share one or two symbols in the time domain.

In the above solution, the D2D subframe further includes a guard time interval according to the system setting or the UE requirement, where the guard time interval is located at the beginning and/or the end of the D2D subframe in the time domain, and includes one or two symbol.

The broadcast message, the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback information are respectively mapped and carried on the Broadcast Channel, the discovery channel, the synchronization channel, the broadcast control channel, and the competitive sounding channel. The resource of the contention feedback channel is not used as the resource unit RE of the mapping pilot RS.

The symbols in the time domain are single carrier frequency division multiple access SC-FDMA symbols, or orthogonal frequency division multiplexing OFDM symbols; the subcarriers are 15 kHz or 7.5 kHz.

Preferably, the network side comprises one or more of the following entities: an evolved base station eNB, a self-organizing network cluster head node Cluster Header, and an evolved universal terrestrial radio access network EUTRAN.

The embodiment of the present invention further provides a UE, where the UE includes: a sending module, configured to map a broadcast message to a Broadcast Channel resource of the D2D subframe, and send the message; or

The method is used for transmitting the broadcast message mapping on the Broadcast Channel resource of the D2D subframe, and simultaneously transmitting at least one of the following information on the D2D subframe: the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback. information.

The sending module is configured to use the discovery signal, the synchronization signal, and the broadcast control The information, the contention detection signal, and the competition feedback information are respectively transmitted on the discovery channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, and the competitive feedback channel for transmission.

Preferably, the UE further includes: a receiving module, configured to receive the Broadcast Channel resource that is pre-configured by the system or configured by the network side; or

Configuring to receive at least one of the Broadcast Channel resource and the following channel resources preconfigured by the system or configured by the network side: the discovery channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, the competitive feedback channel .

Preferably, the UE further includes: a contention module, configured to obtain the Broadcast Channel resource through resource competition.

The Broadcast Channel resource is:

The resources of the discovery channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, and the competitive feedback channel are:

One or two symbols included in the time domain and s subcarriers included in the frequency domain, where the s is a fixed value set by the system, or is indicated by a network side configuration, where s is a positive integer.

The resources of any two or more channels in the discovery channel, the synchronization channel, the broadcast control channel, the competitive sounding channel, and the competitive feedback channel are different in the time domain; or the discovery Channel, synchronization channel, broadcast control channel, competitive detection channel, actually In the contention feedback channel, resources of any two or more channels share one or two symbols in the time domain. The method for transmitting a broadcast message and the user equipment in the D2D communication provided by the embodiment of the present invention, the UE carries the broadcast message to be sent and transmitted on the broadcast channel resource of the D2D subframe, and the UE can further transmit the synchronization on the D2D subframe. Other information such as signal, discovery signal, broadcast control information, competitive detection signal, and competitive feedback information enable the UE to effectively transmit broadcast messages, and achieve efficient transmission of information and network flexibility. DRAWINGS

1 is a schematic diagram of a conventional cellular network data communication method;

2 is a schematic diagram of a D2D communication method;

3 is a schematic structural diagram of an LTE frame;

4 is a schematic diagram of a method for dividing a Broadcast Channel resource according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a method for dividing a Broadcast Channel resource according to an embodiment of the present invention; FIG. FIG. 7 is a schematic structural diagram of frequency hopping of a Broadcast Channel resource between slots according to an embodiment of the present invention; FIG.

8 is a schematic structural diagram of other channel resource independent occupying symbols in the embodiment of the present invention; FIG. 9 is a schematic structural diagram of other multiple channel resource sharing symbols in the embodiment of the present invention; FIG. 10 is a schematic diagram of a D2D Subframe including a GP in the embodiment of the present invention; FIG. 11 is a schematic structural diagram of a structure including a GP in a D2D Subframe according to an embodiment of the present invention; FIG. 12 is a third schematic structural diagram of a GP included in a D2D Subframe according to an embodiment of the present invention; FIG. 14 is a schematic structural diagram of an example four D2D Subframe in the present invention; FIG. 14 is a schematic structural diagram of an example four D2D Subframe in the present invention;

15 is a second schematic structural diagram of an example four D2D Subframe in the present invention;

16 is a schematic structural diagram of an example five D2D Subframe in the present invention; 17 is a schematic structural diagram of an example six D2D Subframe in the present invention;

18 is a schematic structural diagram of an example seven D2D Subframe in the present invention;

19 is a schematic structural diagram of an example eight D2D Subframe in the present invention;

20 is a second schematic structural diagram of an example eight D2D Subframe in the present invention;

FIG. 21 is a schematic structural diagram of a UE according to an embodiment of the present invention;

FIG. 22 is a schematic structural diagram of a UE according to another embodiment of the present invention. detailed description

The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

In the embodiment of the present invention, the network side may include one or more of the following entities: an evolved NodeB (eNB), a cluster header (CH), and an evolved universal terrestrial radio. An Evolved Universal Terrestrial Radio Access Network (EUTRAN) is used as an example of an eNB or a CH as a configuration control entity on the network side.

In the LTE system, each radio frame is 10 ms and contains 10 subframes. Each sub-frame is lms, divided into two slots (slots) of 0.5ms, as shown in Figure 3. When the system frame structure uses the normal Cyclic Prefix (Normal CP), each subframe contains 14 Single-Carrier Frequency Division Multiple Access (SC-FDMA) symbols or orthogonal. Orthogonal Frequency Division Multiplexing (OFDM) symbol, which is divided into 2 slots, each slot includes 7 symbols; when the system frame structure uses Extended Cyclic Prefix (Extended Cyclic Prefix, referred to as Extended CP), Each sub-frame contains 12 symbols, and each slot includes 6 symbols. The symbols in the following description are SC-FDMA symbols, or OFDM symbols.

In the D2D communication, a dedicated D2D communication subframe (D2D subframe) needs to be configured for the D2D data transmission of the UE. When the D2D subframe performs the broadcast message transmission, the D2D subframe may include multiple broadcast channel resources, each UE. Use one The Broadcast Channel carries a mapped broadcast message and transmits it on the D2D subframe.

It should be noted that, in the broadcast message, the transmission processing mode at the physical layer does not distinguish the receiving end, that is, the transmission of the D2D UE does not have clear receiving end information from the perspective of the physical layer. Specifically, the broadcast message is in Broadcast. The channel is sent, and can be received by all other UEs in the surrounding area, and the information is processed by the physical layer and further submitted to the upper layer for further processing. According to the control indication of the high layer signaling, the broadcast message may be a narrow broadcast message, that is, all authorized UEs may receive the obtained information, or may be determined by the UE at the receiving end determined by the high layer communication control indication, so that the UE that meets the indication can be actually implemented. Obtain this message to achieve the effect of multicast or unicast communication through the generalized broadcast message of the physical layer. Thus, broadcast messages herein refer to such generalized broadcast messages, i.e., through further high level control indications, which may be narrowly broadcast messages, multicast messages, or unicast messages. Similarly, the Broadcast Channel here carries a generalized broadcast message, and further includes a narrow broadcast message, a multicast message, and a unicast message.

Multiple UEs can use the respective Broadcast Channels to send broadcast messages on one D2D subframe at the same time. Other UEs are in the listening and receiving state on the D2D subframe, and receive information on the subframe.

At the same time, the UE can also send other information on the D2D subframe, including the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competition feedback information.

The discovery signal (Discovery signal) is used for initial device discovery or basic information notification between UEs in D2D communication. The UE sends a Discovery signal to enable the neighboring UE to know its existence, and can also carry the content through the Discovery signal. The simple information of the UE's own characteristics enables the neighboring UE to initially learn the basic information of the UE. At the same time, the UE monitors and receives the Discovery signal of other neighboring UEs, thereby discovering the existence of other surrounding UEs. Further, the Discovery signal can also be found through the Discovery signal. Basic information of the UE.

The synchronization signal is used for time domain and frequency domain synchronization between UEs, and the UE obtains time/frequency synchronization information of the transmission synchronization signal UE by detecting synchronization signals of other UEs, based on the synchronization information. The number can adjust its own time/frequency positioning to improve reception performance.

The broadcast control information is used to indicate that the control information related to the broadcast message is sent by the network side or sent by the broadcast message sending end UE, and the broadcast control information includes one or more of the following:

The scheduling indication information of the Broadcast Channel, the broadcast message carrying the mapped modulation and coding scheme MCS (Modulation and Coding Scheme) on the Broadcast Channel, and the information of the transmitting end UE transmitting the broadcast message on the Broadcast Channel, such as UE ID, UE RNTI, and the like.

The competition detection signal and the competition feedback information are two types of information used by the UE to perform the competition of the Broadcast Channel resource when the Broadcast Channel resource is obtained through the competition, and the UE that needs to send the broadcast message transmits the message. The contention signal indicates that it is required to compete for the Broadcast Channel resource. The contention signal may include basic information of the UE, such as UE ID and UE NTI. Other UEs that do not participate in the competition of the Broadcast Channel resource monitor the competition detection signal, and all or part of the UE detecting the competition detection signal feeds back the corresponding competition feedback information, and the competition feedback information includes some or all of the UE's interception information. The information of the sounding signal, such as the strength of one or more sounding signals that are monitored, the information of the transmitting end UE included in the sounding signal, and the like.

When a UE needs to send a broadcast message, it needs to obtain the Broadcast Channel resource first. There are three ways to obtain the resource: The broadcast channel of the UE can be predefined by the system. For example, according to the information such as the UE ID, the corresponding index is determined by a predefined index relationship. The channel resource is the available resource of the UE. In the network structure where the eNB/CH is present, the UE requests the Broadcast Channel resource from the eNB/CH, obtains the scheduled Broadcast Channel resource according to the response of the eNB/CH, and uses the configured resource. For the transmission of the broadcast message, the eNB/CH may semi-statically allocate the indicated Broadcast Channel resource to the UE through the high layer signaling, or indicate the configured resource through the physical layer signaling semi-static or dynamic scheduling; or, when the Broadcast Channel resource passes When the resource contention method is obtained, the UE needs to obtain the Broadcast Channel resource through competition. If the resource is successful, the broadcast channel resource is obtained, and the bearer mapping of the broadcast message is sent on the resource. If the competition fails, the UE re-executes. The competition for resources. Correspondingly, the D2D subframe may include other channels in addition to the Broadcast Channel, including a Discovery Channel for carrying the discovery signal, a Synchronization Channel carrying the synchronization signal, a Broadcast Control Channel carrying the broadcast control information, and a competition for carrying the competitive detection signal. A Sounding Channel, and a Feedback Channel that carries competitive feedback information.

Each Broadcast Channel resource includes both time domain and frequency domain. There are three different resource modes:

1. The time domain includes all available symbols in the D2D subframe, and the frequency domain includes k subcarriers. As shown in FIG. 4, the Broadcast Channel resources are as shown in the figure;

2. The time domain contains all the symbols available in the slot, and the frequency domain includes k subcarriers. As shown in Figure 5, the Broadcast Channel resources are shown in the figure and Olffi;

3. The time domain contains m symbols, and the frequency domain contains all the available subcarriers of the Broadcast service. As shown in Figure 6, the Broadcast Channel resources are shown in the figure and OIDJ.

Here, each of the subcarriers is in the frequency domain of 15 kHz, or 7.5 kHz.

In modes 1 and 2, the available symbols in the D2D subframe or slot refer to all symbols except the symbols used by other channels and guard time intervals (GPs), and the symbols used by the other channels, that is, the symbols in which the channel is found are found. The symbol of the synchronization channel, the symbol of the broadcast control channel, the symbol of the competition detection channel, the symbol of the competition feedback channel, and the protection time interval are reserved at the beginning and/or the end of the D2D Subframe according to system settings or UE requirements. Time, containing 1 or 2 symbols, the signal cannot be sent during the guard interval.

In modes 1 and 2, the k subcarriers included in the frequency domain can be set to a fixed value by the system, and no signaling indication is needed, and each broadcast channel includes the same fixed k subcarriers; k can also be flexibly configured by the eNB/CH. It is indicated that the k value needs to indicate the UE through the high layer signaling or the physical layer signaling, and the number of k subcarriers included in the Broadcast Channel resource obtained by each UE may be different; k may also be used according to the D2D Broadcast service. The number of all subcarriers N is determined: When N is less than or equal to 120, k is equal to an integer multiple of 12 or 12;

When N is greater than 120 and less than or equal to 312, k is equal to an integer multiple of 24 or 24; when N is greater than 312 and less than or equal to 756, k is equal to an integer multiple of 36 or 36; when N is greater than 756, k is equal to 48 or 48 Integer multiple

The N, k takes a positive integer.

Further, when the value of k is an integer multiple of 12, the division of the Broadcast Channel resource by the modes 1 and 2 is equivalent to a resource block (abbreviated as RB), and the relationship between the N and the k is also It can be expressed as shown in the following Table 1. The number of all subcarriers that can be used by the D2D Broadcast service is recorded as N^ in units of RBs. The Broadcast Channel determines the k value according to N^, and also records the value in RB as P, and the corresponding k The value is an integer multiple of 12*P.

Table 1

Further, when the method 1 divides the Broadcast Channel resource, between the two slots, the configured frequency domain resources can perform frequency hopping to increase the frequency diversity gain, as shown in FIG. 7.

In mode 3, the Broadcast Channel resource includes m symbols in the time domain: a fixed value set by the system, and does not require any signaling, and each broadcast channel includes the same fixed m symbols; or the eNB/CH flexible configuration indication m The value of the m value needs to be indicated by the high layer signaling or the physical layer signaling. The number of m symbols included in the broadcast channel resource obtained by each UE may be different.

In addition to the Broadcast Channel resource on the D2D subframe, other channels can also be included. For example: discovering any one or more of a channel, a synchronization channel, a broadcast control channel, a competitive sounding channel, and a competitive feedback channel, the resources of each channel are: 1 or 2 symbols in the time domain, when 2 symbols are included The symbol may be a continuous or non-contiguous symbol, the frequency domain includes S subcarriers, s is a fixed value set by the system, or is indicated by an eNB/CH configuration.

For any of the above channels, the Discovery Channel is used as an example. On the symbol where the Discovery Channel is located, according to the s subcarriers as a Discovery Channel resource, multiple Discovery Channel resources use all available subcarriers on the symbol, as shown in Figure 8. The Discovery Channel (shown in Figure 8) uses the symbol #2, s is a fixed value set by the system, then each s subcarrier on symbol #2 is a Discovery Channel resource, and all subcarriers on symbol #2^ P is used as the Discovery Channel resource, class 4, Synchronization Channel (shown as KKI in Figure 8) uses symbol 9, and also occupies all subcarriers of symbol #9; or, any two or more of the above other channels The channels can use different subcarriers as the respective channel resources on the same symbol. The Discovery Channel and the Synchronization Channel are taken as an example. As shown in Figure 9, the Discovery Channel (shown in Figure 9) and Synchronization Channel (shown as EKI in Figure 9) uses symbol #2 and symbol #8 together, in each Symbolically, the Discovery Channel and the Synchronization Channel respectively use different subcarriers as their respective channel resources, which together use all available subcarriers of symbols #2 and #8.

According to system settings or UE requirements, the GPs reserved at the beginning and/or the end of the D2D Subframe contain 1 or 2 symbols, as shown in Figure 10-12, which is shown in Figure II. Figure 10 shows that a GP is reserved at the beginning and the end of the D2D subframe, and the sum of the two GPs in the time domain is one symbol length (or two GPs each occupy one symbol length, then the total GP is two symbols) The available symbols of the D2D subframe include the first symbol after the GP, denoted by the symbol #0, and the symbol #0 contains the symbol #0-symbol #6 (normal CP), or the symbol #0-symbol #5 ( Extend CP ), in slot#l contains symbol #7-symbol #12 ( normal CP ), or symbol #6-symbol #10 ( extend CP ); Figure 11 shows a GP at the beginning of the D2D subframe, and The GP length is one symbol, and the available symbols of the D2D subframe include the first symbol after the symbol #0 where the GP is located, that is, the symbol #1, and the symbol #0 includes the symbol #1-symbol #6 (normal CP), Or symbol #1-symbol#5 (extend CP), in slot#l contains symbol #7-symbol#13 (normal CP), or symbol #6-symbol#11 (extend CP); Figure 12 shows the D2D A GP is reserved at the end of the subframe, and the GP length is one symbol. The available symbols of the D2D subframe start from the symbol #0, and the symbol #0 contains the symbol #0-symbol #6 (normal CP), or the symbol #0-symbol# 5 ( extend CP ), in slot #l contains the symbol #7-symbol #12 ( normal CP ), or the symbol #6-symbol #10 ( extend CP ).

The D2D subframe can carry a Broadcast Channel, or carry any one or more of the Broadcast Channel and other channels, and if a reference signal (RS) needs to be mapped in the resources included in the Broadcast Channel and other channels, The location of the resource element (Resource Element, RE, one symbol on the real-time domain, one sub-carrier in the frequency domain) cannot be used for the Broadcast Channel and other channels to carry corresponding information, that is, in the resources allocated by each channel. Does not include the corresponding RE used to map the RS,

That is, in the embodiment of the present invention, the broadcast message, the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback information are respectively mapped and carried on the Broadcast Channel, the discovery channel, the synchronization channel, the broadcast control channel, The resource of the competitive sounding channel and the contention feedback channel is not used as the resource unit RE of the mapping pilot RS.

The invention will now be described in detail in connection with the specific embodiments. Example one

In this embodiment, the eNB controls to schedule the UE to perform D2D communication, including scheduling configuration of the Broadcast Channel resource. The system uses the Broadcast Channel resource structure described in the foregoing mode 1, that is, each broadcast channel resource includes all available symbols in the D2D subframe, the frequency domain includes k subcarriers, and k is broadcasted by the eNB according to the amount of data required by the D2D UE. Flexible configuration. As shown in Figure 4, the _e NB configures the Broadcast Channel resource for the D2D UE A and the UE B on the D2D subframe. The Broadcast Channel resource obtained by the UE A is shown in Figure 2, and the UE B resource is shown as DJE! . It can be seen that the Broadcast Channel resource obtained by UE A and UE B includes all available symbols in the D2D subframe time domain, and includes k subcarriers in the frequency domain, and the "k" values obtained by UE A and UE B are different. The eNB determines, according to the broadcast message traffic volume to be sent by the UE itself, as shown in FIG. 4, the broadcast message of the UE B contains a large amount of traffic, so the value of the "k" configured to the UE B is large, that is, the UE B obtains The Broadcast Channel resource contains more subcarriers in the frequency domain than UE A's Broadcast Channel resource. Example 2 In this embodiment, the D2D UE obtains the Broadcast Channel resource in a competitive manner, and the system uses the Broadcast Channel resource structure in the foregoing mode 2, and the k value is a fixed value set by the system, where k=48 is taken as an example. To illustrate, each Broadcast Channel contains 4 RBs in one slot.

As shown in FIG. 5, each broadcast channel is fixed to include all the available symbols in one slot in the time domain, and four RBs in the frequency domain, and the UE obtains the corresponding successful Broadcast Channel resource through the resource competition process, UE A. The UE B obtains a Broadcast Channel resource through resource competition. The Broadcast Channel resource obtained by UE A is shown in Figure 2 [J2J, and the UE B resource is shown in DJH! Example 3 In this embodiment, the eNB controls to schedule the UE to perform D2D communication, including scheduling configuration of the Broadcast Channel resource. The system uses the Broadcast Channel resource structure described in the foregoing mode 3, that is, each broadcast channel resource includes m symbols in the D2D subframe, the frequency domain includes all available subcarriers, and m is a fixed value set by the system, m=2 . In addition, the D2D subframe also includes a Discovery Channel, which occupies the symbol #2 in the time domain, and each Discovery Channel includes a fixed s subcarriers set by the system in the frequency domain, s=12. Since symbol #2 is a Discovery Channel resource in the D2D subframe, the symbol #2 is not included in the available symbols of the Broadcast Channel.

As shown in Figure 13, the extended CP is used as an example. The eNB configures the Broadcast Channel resource for the D2D UE A and the UE B on the D2D subframe. The Broadcast Channel resource obtained by the UE A is shown in Figure 2, UE B. The resources are as shown in ■]. It can be seen that the Broadcast Channel resources obtained by UE A and UE B include all available subcarriers in the D2D subframe frequency domain, and the time domain includes symbols #0, #1, and symbols #3, #4, respectively. Symbol #2 is the Discovery Channel. As shown in the figure, it is divided into multiple Discovery Channel resources per 12 subcarriers.

Example four

In this embodiment, the eNB controls the scheduling UE to perform D2D communication, including scheduling configuration of the Broadcast Channel resource. The system uses the Broadcast Channel resource structure described in the foregoing mode 1, that is, each Broadcast Channel resource includes all available symbols in the D2D subframe, the frequency domain includes k subcarriers, and k is a system fixed value, k=36.

In addition, Discovery Channel and Synchronization are also included on the i1⁄2L D2D subframe.

Channel, each Discovery Channel occupies the symbol #2 in the time domain, and the frequency domain contains fixed s subcarriers set by the system, s=12. Each Synchronization Channel occupies the symbol #9 in the time domain, and the frequency domain contains a fixed s subcarriers set by the system, s=24. Since symbol #2 and symbol #9 are the Discovery Channel and Synchronization Channel resources in the D2D subframe, the symbols #2 and #9 are not included in the available symbols of the Broadcast Channel.

As shown in FIG. 14 , the extended CP is used as an example. The eNB configures the Broadcast Channel resource for the D2D UE A and the UE B on the D2D subframe. The Broadcast Channel resource obtained by the UE A is shown in FIG. The resources are as shown in ■]. It can be seen that the Broadcast Channel resource obtained by the UE A and the UE B includes all available symbols except the symbol #2 and the symbol #9 on the D2D subframe time domain, and the frequency domain includes 36 subcarriers. symbol #2 is the Discovery Channel, as shown in the figure, divided into multiple Discovery Channel resources per 12 subcarriers, and symbol #9 is the Synchronization Channel, as shown in the figure, divided into multiple Synchronizations per 24 subcarriers. Channel resources;

Alternatively, the Discovery Channel and the Synchronization Channel share the same symbol, and the two use the symbol #2 and the symbol #9 together, occupying different subcarriers in the frequency domain respectively, where the system settings are fixed in the frequency domain of the Discovery Channel and the Synchronization Channel. s subcarriers, s=12 as an example for description. As shown in FIG. 15 , the eNB configures the Broadcast Channel resource for the D2D UE A and the UE B on the D2D subframe, and the symbol #2 and the symbol #9 are respectively divided into 12 subcarriers according to the above example. Discovery ChanneK as shown in the figure) or Synchronization ChanneK as shown in the figure). Instance 5 In this embodiment, the system uses a predefined manner for the Broadcast Channel resource, and the UE obtains the corresponding Broadcast Channel resource according to the corresponding relationship between the certain Broadcast Channel resource and the UE ID according to the UE ID. Here, the system uses the Broadcast Channel resource structure in the above manner 2 as an example, and the k value is a fixed value set by the system. Here, k=48 is taken as an example for description, that is, each broadcast channel includes four RBs in one slot. Then, any UE may calculate a unique broadcast channel resource according to its own UE ID, such as UE-RNTI, in a fixed-correspondence relationship, and use this resource to send a broadcast message.

Further, in consideration of transmission or reception of signals in different subframes when the UE performs D2D Communication, a GP may be set for a certain time between subframes due to the transition of the transmission/reception state. In this example, a state transition of the GP for receiving-transmitting, transmitting-receiving is respectively reserved at the start position and the ending position of the D2D subframe in which the UE transmits the broadcast message, as shown in FIG.

The UE obtains the Broadcast Channel resource on the D2D subframe and carries the broadcast message. For example, as shown in Figure 16, UE A and UE B respectively calculate the corresponding Broadcast Channel resource according to their own UE ID. The Broadcast Channel resource of UE A is shown in the figure in the figure, UE B The resources are as shown in uriii, and since each segment retains a GP at the beginning and the end of the subframe (as shown in C^ in the figure), the actual available symbols of the Broadcast Channel resource of UE A include the symbol #0-symbol# of slot #0. 5. The actual available symbols of UE B include symbol #6-symbol #10 of slot#l. Example 6 In this embodiment, the eNB controls to schedule the UE to perform D2D communication, including scheduling configuration of the Broadcast Channel resource. The system uses the Broadcast Channel resource structure described in the foregoing mode 1, that is, each broadcast channel resource includes all available symbols in the D2D subframe, and the frequency domain includes k subcarriers, and k is a system fixed value, k=24.

In addition, in order to further improve the resource usage efficiency of the Broadcast Channel, the D2D subframe also includes a Broadcast Control Channel, and each Broadcast Control Channel corresponds to a Broadcast Channel, which includes control indication information about the Broadcast Channel, such as MCS, and Broadcast Control. The channel occupies symbols #0 and #1 in the time domain, and the frequency domain includes fixed s subcarriers set by the system, s=k=24, and contains the same subcarriers as the corresponding Broadcast Channel. Since the symbols #0 and #1 are used as the Broadcast Control Channel resources in the D2D subframe, the symbols #0 and #1 are not included in the available symbols of the Broadcast Channel.

As shown in Figure 17, the extend CP is taken as an example. The eNB is on the D2D subframe.

D2D UE A and UE B are respectively configured with Broadcast Channel resources, and the Broadcast Channel resources obtained by UE A are shown in Figure 22, and the Broadcast Control Channel resources are hidden as shown in the figure. The Broadcast Channel resources of UE B are shown in the figure. As shown in Figure 22, the Broadcast Control Channel resource is shown in the figure. It can be seen that the Broadcast Channel resources obtained by the UE A and the UE B include all the symbols except the symbols #0 and #1 on the D2D subframe time domain. The available symbols, the frequency domain includes a fixed number of 24 subcarriers, and the symbols #0 and #1 on the subcarrier where each Broadcast Channel is located are the corresponding Broadcast Control Channels of the Broadcast Channel, which includes the broadcast channel resource bearer. Further control indication of the broadcast message.

Example 7 In this embodiment, the D2D UE obtains the Broadcast Channel resource in a competitive manner, and the system uses the Broadcast Channel resource structure described in the foregoing manner 1, that is, each Broadcast Channel resource includes all available symbols in the D2D subframe. The frequency domain contains k subcarriers, and k is a fixed value of the system, k=24.

In the broadcast resource competition process, the UE needs to pass the Sounding Channel and

The Feedback Channel performs resource detection and feedback, and combines the feedback information to determine whether the competition is successful and obtains the corresponding Broadcast Channel resource. Taking the Extend CP as an example, each Sounding Channel occupies the symbol #9 in the time domain, and the frequency domain includes fixed s subcarriers set by the system, s=6; each of the Feedback Channels occupy the symbol #10, # in the time domain. 11. The frequency domain contains fixed s subcarriers set by the system, s=6. Then, in the D2D subframe, the symbols #9, #10, and #11 are the Sounding Channel and Feedback Channel resources, so the symbols #9, #10, and #11 are not included in the available symbols of the Broadcast Channel.

Considering that the resource competition is successful, the UE that obtains the resource needs a certain time to perform the 7-load processing of the broadcast message. Therefore, the Sounding Channel and the Feedback Channel may not be in the same subframe as the corresponding Broadcast Channel resource, that is, on the subframe #n. By transmitting the Sounding signal and receiving the feedback, the competition successfully obtains the Broadcast Channel resource, and the Broadcast Channel resource is in the subframe #n+t, and the t is an integer greater than or equal to 1.

As shown in FIG. 18, the UE determines that the corresponding Broadcast Channel resource is successful through the Sounding signal and the feedback information of the Feedback Channel in the subframe #n, and the UE uses the Broadcast Channel to map its own broadcast message on the subframe #n+t. And proceed Sending, at the same time, there are also Sounding Channel and Feedback Channel resources on the subframe #n+t, as the Broadcast Channel resource competition service on the next available D2D subframe. The UE A sends a Sounding signal on the subframe #n, as shown in the figure, and receives the feedback information on the Feedback Channel. As shown in the figure below, the UE successfully obtains the corresponding Broadcast Channel resource, that is, the subframe #n. The corresponding Broadcast Channel resource on +t, as shown in the figure, is used to send broadcast messages. Similarly, UE B sends a Sounding signal on subframe #n, as shown in the figure below, and receives the feedback information on the Feedback Channel. As shown in the figure below, the competition successfully obtains the corresponding Broadcast Channel resource, that is, the subframe. The corresponding Broadcast Channel resource on #n+t is shown in the figure. Example 8 In this embodiment, for the effective reception of data, in addition to including various types of channel resources, the D2D subframe needs to include necessary pilot RS signals, and the RS has the highest priority in the mapping of physical resources, that is, RS. The resources that need to be used cannot be occupied by any channel resources, so the set RS resources will affect the resource usage of other channels.

When the RS resource includes one or more symbols in the time domain, and the frequency domain includes all available subcarriers of the D2D subframe, the symbol in which the RS resource is located cannot be used as any channel resource. Take the Extend CP as an example. As shown in Figure 19, the D2D Subframe includes the Broadcast Channel resource. The RS resource occupies the symbols #2 and #8 in the time domain. As shown in 匚Z1 in the figure, it is in the available symbols of the Broadcast Channel. Excluding symbols #2 and #8, the actual available resources of the Broadcast Channel divided by mode 1 are as shown in Figure 19 and ΪΓΙϋ.

Alternatively, the RS resource occupies part of the RE in the D2D Subframe in the form of a pattern, and the corresponding RE cannot be used as any channel resource. Similarly, the Extend CP is used as an example. As shown in Figure 20, the D2D Subframe includes the Broadcast Channel resource. The RS resource is shown in Figure 2 in the time domain. If part of the RE is used, these REs cannot be used as the Broadcast Channel. Resources, the corresponding broadcast message bearer mapping should avoid the RE where the RS is located, as shown in Figure ii, Dll.

The embodiment of the present invention further provides a UE 21, as shown in FIG. 21, including:

The sending module 211 is configured to carry the broadcast message mapping on the Broadcast Channel resource of the D2D subframe and send the broadcast message; or

The device is configured to transmit the broadcast message mapping on the Broadcast Channel resource of the D2D subframe, and simultaneously send at least one of the following information on the D2D subframe: the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback. information.

Preferably, the sending module 211 is configured to map the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback information, respectively, to a discovery channel, a synchronization channel, a broadcast control channel, and a competition. The sounding channel is transmitted on the sounding feedback channel.

Preferably, the UE further includes: a receiving module 212, configured to receive at least one of the Broadcast Channel resource and the following channel resources that are pre-configured by the system or configured by the network side: the discovery channel, the synchronization channel, Broadcast control channel, competitive sounding channel, and competitive feedback channel.

The embodiment of the present invention further provides a UE 22, as shown in FIG. 22, including: a sending module 221 and a contention module 222, where

The sending module 221 is configured to carry the broadcast message mapping on the broadcast channel Broadcast Channel resource of the D2D subframe subframe and send the broadcast message; or

Preferably, the sending module 221 is configured to map the discovery signal, the synchronization signal, the broadcast control information, the competitive detection signal, and the competitive feedback information, respectively, on the discovery channel, the synchronization channel, the broadcast control channel, and the competition. The sounding channel is transmitted on the sounding feedback channel.

Preferably, the contention module 222 is configured to obtain the broadcast by resource competition. Channel resources.

Here, the sending module, the receiving module, and the contention module may pass through a central processing unit (CPU), a digital signal processor (DSP) or a programmable logic array in the UE. (Field - Programmable Gate Array, referred to as FPGA) implementation.

In the above solution, the Broadcast Channel resource is:

m symbols included in the time domain, all broadcast service available subcarriers included in the frequency domain.

The available symbols of the Broadcast Channel resource include all symbols in the D2D subframe or in each slot except the following symbols:

In the embodiment of the present invention, the UE carries a broadcast message to be sent and transmits the broadcast message on the broadcast channel resource of the D2D subframe, and the UE may further transmit a synchronization signal, a discovery signal, and other information on the D2D subframe to enable the UE to Ability to broadcast effectively The delivery of messages enables efficient delivery of information and increased network flexibility.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

claims

1. A method for sending broadcast messages in device-to-device D2D communication. The method includes: User equipment UE maps the broadcast message to a broadcast channel carried in a D2D subframe subframe

Broadcast Channel resource and send; or,

The UE carries the broadcast message mapping on the Broadcast Channel resource of the D2D subframe and sends it, and also sends at least one of the following information on the D2D subframe: discovery signal, synchronization signal, broadcast control information, competition detection signal, competition feedback information .

2. The method according to claim 1, wherein the discovery signal, synchronization signal, broadcast control information, competition detection signal and competition feedback information are respectively mapped and carried on the discovery channel, synchronization channel, broadcast control channel, and competition channel. It is sent on the contention detection channel and the contention feedback channel.

3. The method according to claim 1, wherein the Broadcast Channel resource is:

All available symbols of the D2D subframe included in the time domain, k subcarriers included in the frequency domain or

All available symbols in a slot included in the time domain, k subcarriers included in the frequency domain or

m symbols included in the time domain, and all available subcarriers for broadcast services included in the frequency domain.

4. The method according to claim 3, wherein the available symbols of the Broadcast Channel resource include all symbols in the D2D subframe or in each slot except for the following symbols:

The time interval is the symbol where the GP is located, the symbol where the discovery channel is located, the symbol where the synchronization channel is located, the symbol where the broadcast control channel is located, the symbol where the competition detection channel is located, and the symbol where the competition feedback channel is located.

5. The method according to claim 3, wherein the number of symbols m of the Broadcast Channel resource in the time domain is: A fixed value set by the system; or, a value of m indicated by network-side configuration.

6. The method according to claim 3, wherein the number k of subcarriers included in the Broadcast Channel resource in the frequency domain is:

A fixed value set by the system; or, the k value is determined based on the number N of all available subcarriers of the broadcast service; or, the k value is indicated by the network side configuration, where the values of N and k are positive integers.

7. The method according to claim 6, wherein the k value is determined according to the number N of available subcarriers, and is:

When N is less than or equal to 120, k is equal to 12 or an integer multiple of 12;

When N is greater than 120 and less than or equal to 312, k is equal to 24 or an integer multiple of 24; when N is greater than 312 and less than or equal to 756, k is equal to 36 or an integer multiple of 36; when N is greater than 756, k is equal to 48 or 48 Integer multiple.

8. The method according to any one of claims 1 to 7, wherein the Broadcast Channel resource is preconfigured by the system, or configured for the UE by the network side, or obtained by the UE through resource competition.

9. The method according to claim 8, wherein the network side configures Broadcast Channel resources for the UE, which is:

The network side indicates the Broadcast Channel resources configured for the UE semi-statically through high-layer signaling; or dynamically indicates or semi-statically indicates the Broadcast Channel resources configured for the UE through physical layer signaling.

10. The method according to claim 2, wherein the resources of the discovery channel, synchronization channel, broadcast control channel, competition detection channel, and competition feedback channel are:

1 or 2 symbols included in the time domain and s subcarriers included in the frequency domain, where s is a fixed value set by the system or indicated by the network side configuration, where the value of s is a positive integer.

11. The method according to claim 2, wherein among the discovery channel, synchronization channel, broadcast control channel, competition detection channel, and competition feedback channel, the resources of any two or more channels are located in the time domain. The symbols included are not the same; Or, among the discovery channel, synchronization channel, broadcast control channel, competition detection channel, and competition feedback channel, resources of any two or more channels share 1 or 2 symbols in the time domain.

12. The method according to any one of claims 1 to 7, wherein, according to system settings or UE requirements, the D2D subframe also includes a guard time interval, wherein the guard time interval is located in the time domain Beginning and/or end of D2D subframe, containing 1 or 2 symbols.

13. The method according to claim 2, wherein the broadcast message, discovery signal, synchronization signal, broadcast control information, competition detection signal and competition feedback information are respectively mapped and carried on the Broadcast Channel, discovery channel, The resources of the synchronization channel, the broadcast control channel, the contention detection channel, and the contention feedback channel are not used as resource units RE for mapping the pilot RS.

14. The method according to claim 3, wherein the symbols in the time domain are single carrier frequency division multiple access SC-FDMA symbols, or orthogonal frequency division multiplexing OFDM symbols; the subcarriers are 15kHz or 7.5 kHz.

15. The method according to claim 5, 6, 8, 9 or 10, wherein the network side includes one or more of the following entities: evolved base station eNB, self-organizing network cluster head node Cluster Header, Evolved Universal Terrestrial Radio Access Network EUTRAN.

16. A user equipment UE, the UE includes: a sending module configured to carry the broadcast message mapping on the Broadcast Channel resource of the D2D subframe subframe and send it; or,

Configured to carry the broadcast message mapping on the Broadcast Channel resource of the D2D subframe for sending, and at the same time send at least one of the following information on the D2D subframe: discovery signal, synchronization signal, broadcast control information, competition detection signal, competition feedback information.

17. The UE according to claim 16, wherein the sending module is configured to transmit the discovery signal, synchronization signal, broadcast control information, contention detection signal and contention feedback The information is mapped and carried on the discovery channel, synchronization channel, broadcast control channel, competition detection channel, and competition feedback channel for transmission.

18. The UE according to claim 16 or 17, wherein the UE further includes: a receiving module configured to receive the Broadcast Channel resource preconfigured by the system or configured by the network side; or,

Configured to receive the Broadcast Channel resource preconfigured by the system or configured by the network side and at least one of the following channel resources: the discovery channel, the synchronization channel, the broadcast control channel, the competition detection channel, and the competition feedback channel .

19. The UE according to claim 16 or 17, wherein the UE further includes: a competition module configured to obtain the Broadcast Channel resource through resource competition.

20. The UE according to claim 16 or 17, wherein the Broadcast Channel resource is:

21. The UE according to claim 20, wherein the available symbols of the Broadcast Channel resource include all symbols in the D2D subframe or in each slot except for the following symbols:

22. The UE according to claim 17, wherein the resources of the discovery channel, synchronization channel, broadcast control channel, contention detection channel, and contention feedback channel are:

23. The UE according to claim 17 or 22, wherein resources of any two or more channels among the discovery channel, synchronization channel, broadcast control channel, contention detection channel, and contention feedback channel are in the time domain. The symbols contained on are not the same;

Or, among the discovery channel, synchronization channel, broadcast control channel, competition detection channel, and competition feedback channel, resources of any two or more channels share 1 or 2 symbols in the time domain.