WO2016161607A1 - Physical sidelink discovery channel (psdch) sending method and apparatus - Google Patents

Abstract

Disclosed are a physical sidelink discovery channel (PSDCH) sending method and apparatus. The method comprises: a first user equipment communicating with a second user equipment in a device-to-device (D2D) mode; when the first user equipment sends a discovery message to the second user equipment, generating type information corresponding to the type of the discovery message; and sending the discovery message and the type information to the second user equipment, so that the second user equipment determines the type of the discovery message based on the type information. The method and apparatus provided in the present invention can reduce the delay and complexity for a receiving side device to process a discovery message.

Description

Method and device for transmitting physical side line discovery channel PSDCH Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a physical side discovery channel PSDCH.

Background technique

Device-to-device (D2D) is a kind of end-to-end direct communication technology. The difference from the traditional cellular communication technology is that the communication between the terminal and the terminal can be directly communicated without the relay of the base station. Resources can be configured, scheduled, coordinated, etc., and the secondary terminals can communicate directly.

In the third generation partnership project services and system aspect (3GPP SA1), the application scenarios of Long Term Evolution-device-to-device (LTE-D2D) are divided into There are two main categories: public safety and commercial applications. Public safety refers to an earthquake or emergency. If the cellular network is not working properly, it can also allow off-network communication between terminals.

Terminals that support D2D have both the ability to receive and transmit on the upstream frequency band, but the reception and transmission cannot occur simultaneously, that is, the half-duplex mode.

The D2D technology is discussed in 3GPP. The D2D technology in Long Term Evolution (LTE Rel. 12) uses the form of broadcast to transmit data. It includes two features: device-to-device discovery message (D2D). Discovery) and device-to-device communication signals (D2D communication). D2D Discovery is the periodic broadcast information of the terminal, so that users around him can detect the information and discover the user.

In the device-to-device Work Item Description (D2D WID) of LTE Rel13, the enhancement of Discovery is proposed, that is, the public security D2D discovery is supported in the scenario of partial network coverage and no network coverage. Public safety D2D discovery supports the following two application examples:

UE-to-network relay discovery: A terminal without network coverage can connect to the network through a terminal-to-network relay, so that a terminal without network coverage can perform regular network communication and expand the existing network. Actual coverage;

Group Member discovery: The goal is to find the target terminal through D2D discovery for one-to-one (1:1) or one-to-many (1:X) D2D communication;

In addition, public safety D2D discovery generally has two discovery modes:

Mode A (Model A): Using a discovery protocol message (notification mode) (corresponding to the content of the 3GPP TR23.713 protocol: In this model the announcing UE broadcasts discovery messages at pre-defined discovery intervals and the monitoring UEs that are interested in These messages read them and process them)

Mode B: Using two discovery protocol messages (request and response mode) (corresponding to the content of the 3GPP TR23.713 protocol: Discoverer UE: The UE transmit a request containing certain information about what it is interested to discover. Discovere UE: The UE that receives the request message can respond with some information related to the discoverer's request.)

In view of the enhancement of Discovery, the device that receives the discovery message (ie, the receiving device) needs to perform corresponding processing for different types of discovery messages, but in the prior art, it is necessary to use higher layers to distinguish different types of discovery messages (ie, discovery messages). Various functions). Therefore, the following problems are caused: all received discovery messages need to be demodulated at the physical layer, and then submitted to the upper layer, and the upper layer decides which ones are needed by the receiving side device, which causes even a lot of high-level feelings. The discovery message of interest also needs to be demodulated at the physical layer, and there is a problem of wasting power.

Summary of the invention

The present invention provides a method and apparatus for transmitting a physical side discovery channel PSDCH. The method and apparatus provided by the present invention solve the problem of wasting power in the manner of parsing a discovery message in the prior art.

In a first aspect, a method for transmitting a physical side discovery channel PSDCH is provided. The first user equipment communicates with the second user equipment by using a device to device D2D manner, and the method includes:

The first user equipment generates type information corresponding to a type of the discovery message;

The first user equipment sends the discovery message and the type information to the second user equipment, where the type information is used to indicate that the second user equipment determines the discovery message based on the type information. Types of.

With reference to the first aspect, in a first possible implementation manner, the type of the discovery message includes one or more of user equipment to network relay discovery, group member discovery, business discovery, and vehicle-to-node V2X.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the type information is indicated by a scrambling code of the discovery message, and the generating and the discovery message are The type information corresponding to the type includes:

Setting a cell identifier cell ID and/or a user equipment identifier RNTI corresponding to the type of the discovery message when the scrambling code generator is initialized;

Generating a scrambling code corresponding to the type of the discovery message.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a third possible implementation manner, the type information is indicated by the demodulation reference signal DMRS, and the generating corresponds to the type of the discovery message. Type information includes:

Setting a combination of one or more of a cell identifier Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC corresponding to the type of the discovery message;

A demodulation reference signal corresponding to the type of the discovery message is generated.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a fourth possible implementation, the type information is indicated by a mask, and the type information corresponding to the type of the discovery message is generated. include:

Multiplying a mask corresponding to the type on the cyclic redundancy check code CRC of the discovery message.

A second aspect provides a method for receiving a PSDCH of a physical side-discovery channel, where the first user equipment communicates with the second user equipment by using a device-to-device D2D manner, where the method includes:

Receiving, by the second user equipment, a discovery message sent by the first user equipment and type information corresponding to a type of the discovery message;

The second user equipment determines the type of the discovery message based on the type information.

With reference to the second aspect, in a first possible implementation manner, the type of the discovery message includes one or more of user equipment to network relay discovery, group member discovery, business discovery, and vehicle-to-node V2X.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the type information is indicated by a scrambling code of the discovery message, and the discovery is determined based on the type information The types of messages include:

Desmuting the discovery message, and acquiring a scrambling code corresponding to the discovery message;

Determining the type of the discovery message according to the cell identity cell ID and/or the user equipment identity RNTI in the scrambling code.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a third possible implementation, the type information is indicated by demodulating a reference signal DMRS, and the determining the discovery based on the type information The types of messages include:

Obtaining a demodulation reference signal corresponding to the discovery message;

The type of the discovery message is determined based on a combination of one or more of a cell identity Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC in the demodulation reference signal.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a fourth possible implementation, the type information is indicated by a mask, and the determining the type of the discovery message based on the type information include:

Obtaining a cyclic redundancy check code CRC corresponding to the discovery message;

A type of the discovery message is determined based on a mask corresponding to the cyclic redundancy check code CRC of the discovery message.

In a third aspect, a physical side-discovery channel PSDCH transmitting apparatus is provided, where the apparatus communicates with a second user equipment by means of a device-to-device D2D mode, and the apparatus includes:

a generating unit, configured to generate type information corresponding to a type of the discovery message;

a sending unit, configured to send the discovery message and the type information to the second user equipment, where the type information is used to indicate that the second user equipment determines the The type of message found.

With reference to the third aspect, in a first possible implementation, the type of the discovery message sent by the sending unit includes one of user equipment to network relay discovery, group member discovery, business discovery, and vehicle-to-node V2X. Kind or several.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner, the type information is indicated by a scrambling code of the discovery message, where the generating unit is specifically used to The code generator initializes a cell identifier cell ID and/or a user equipment identifier RNTI corresponding to the type of the discovery message; and controls the scrambling code generator to generate a scrambling code corresponding to the type of the discovery message.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a third possible implementation manner, the type information is indicated by using a demodulation reference signal DMRS, where the generating unit is specifically configured to set Deriving a combination of one or more of a cell identifier Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC corresponding to the type of the discovery message; generating a demodulation reference signal corresponding to the type of the discovery message.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a fourth possible implementation, the type information is indicated by a mask, and the generating unit is specifically configured to be used in the loop of the discovery message. The redundancy check code CRC is multiplied by a mask corresponding to the type.

In a fourth aspect, a physical side discovery channel PSDCH receiving device is provided, where the device communicates with a second user equipment by means of a device to device D2D mode, the device comprising:

a receiving unit, configured to receive a discovery message sent by the first user equipment and type information corresponding to a type of the discovery message;

And a type determining unit, configured to determine a type of the discovery message based on the type information.

With reference to the fourth aspect, in a first possible implementation, the type determining unit is specifically configured to determine, according to the type information, the type of the discovery message as user equipment to network relay discovery, group member discovery, and business discovery. And one or several of the car to the node V2X.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the type determining unit is indicated by a scrambling code of the discovery message, where The method is specifically configured to perform descrambling on the discovery message, obtain a scrambling code corresponding to the discovery message, and determine a type of the discovery message according to the cell identifier cell ID and/or the user equipment identifier RNTI in the scrambling code.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a third possible implementation manner, the type determining unit is specifically configured to obtain the information by using the demodulation reference signal DMRS to indicate the type information. Demodulating a reference signal corresponding to the discovery message; determining a type of the discovery message based on a combination of one or more of a cell identifier Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC in the demodulation reference signal .

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a fourth possible implementation, the type information is indicated by a mask, where the type determining unit is specifically configured to obtain the discovery message. Corresponding cyclic redundancy check code CRC; determining a type of the discovery message based on a mask corresponding to a cyclic redundancy check code CRC of the discovery message.

One or both of the above technical solutions have at least the following technical effects:

The method and the device provided by the present invention send the indication information indicating the type of the discovery message when the discovery message is sent, so that the receiving side device can distinguish different types of discovery messages according to the indication information at the physical layer, and then the receiving side device can Only the required discovery message is demodulated, thereby reducing the power consumption of the receiving device, saving power, and reducing the complexity of processing the discovery message by the receiving device.

DRAWINGS

1 is a schematic flowchart of a method for transmitting a physical side discovery channel PSDCH according to Embodiment 1 of the present invention;

2 is a schematic flowchart of a method for receiving a physical side discovery channel PSDCH according to Embodiment 6 of the present invention;

3 is a schematic structural diagram of a device for transmitting a physical side discovery channel PSDCH according to Embodiment 11 of the present invention;

4 is a schematic structural diagram of a physical side discovery channel PSDCH receiving apparatus according to Embodiment 12 of the present invention;

FIG. 5 is a schematic structural diagram of a user equipment according to Embodiment 13 of the present invention;

FIG. 6 is a schematic structural diagram of a user equipment according to Embodiment 14 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The method provided by the present invention sends an indication information indicating the type of the discovery message when the discovery message is sent, so that the receiving side device can quickly distinguish different types of discovery messages according to the indication information, and then the receiving side device can only need the required information. The discovery message of interest is demodulated and decoded, thereby reducing the power consumption of the device on the receiving side, saving power, and reducing the delay and complexity of processing the discovery message by the receiving device. The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

Embodiment 1

As shown in FIG. 1 , an embodiment of the present invention provides a method for transmitting a physical side discovery channel PSDCH. The first user equipment communicates with the second user equipment by using a device to device (D2D) manner, and the method includes:

Step 101: When the first user equipment sends a discovery message (D2D discovery) to the second user equipment, generate type information corresponding to the type of the discovery message.

In the embodiment of the present invention, the types of the discovery message include UE-to-network relay discovery, Group Member Discovery, commercial discovery, and vehicle-to-node ( One or more of vehicle to anything, V2X).

Step 102: Send the discovery message and the type information to the second user equipment, so that The second user equipment determines the type of the discovery message based on the type information.

The method provided by the embodiment of the present invention generates type information corresponding to the type of the discovery message, and sends the type information to the receiving side in a set manner, so that the receiving side can distinguish different types of discovery messages at the physical layer, thereby avoiding All the discovery messages are demodulated and submitted to the upper layer for decision processing. The power consumption of the terminal is reduced, the power is saved, and the processing complexity of the terminal can be reduced.

In the embodiment of the present invention, the type information may be indicated in multiple manners. The following provides several optimized solutions, including:

Embodiment 2

In this embodiment, by indicating the type information of the scrambling code of the message, generating the type information corresponding to the type of the discovery message includes:

Setting a cell identifier (cell ID) and/or a user equipment identifier (RNTI) corresponding to the type of the discovery message when the scrambling code generator is initialized;

Generating a scrambling code corresponding to the type of the discovery message.

In a specific application, the implementation can be:

The parameters affecting the Discovery scrambling sequence are shown in Table 1. The parameter cell ID (Radio-Network Temporary Identifier, RNTI) corresponding to the Scrambling part shown in Table 1, the number of slots ( The parameter values such as the Slot number, and the codeword number (CW number) can be modified according to the type of the discovery message, so that the receiving side determines the type of the discovery message according to different parameter values.

Table 1

If the cell ID and RNTI in the above adjustable parameters are used to refer to the type of the discovery message The specific example may be (this example is only a specific example of the solution, and the invention is not limited to the two parameters. In the specific implementation process, any adjustable parameter in Table 1 may be selected. ):

In the existing D2D system, the cell ID is fixed at 510 and the RNTI is fixed to 0, so the scrambling/descrambling sequences of all the discovery messages are the same. In this embodiment, in order to distinguish different types of discovery messages, the cell ID or the RNTI may be set to different values, and thus the generated scrambling/descrambling sequences are also different, and the discovery message is performed by using the parameter-adjusted scrambling code sequence. After the scrambling process is performed, it is sent to the receiving side. The receiving side can generate different local scrambling code sequences according to different parameters corresponding to different discovery message types. When the local scrambling code sequence matches the scrambling code sequence of the transmitted discovery message, It is possible to solve the received discovery message, so that the receiving side terminal can identify the type of the received discovery message by the parameter of the scrambling code sequence by detecting the discovery message.

Further, because there are UE-to-network relay discovery with different hop counts, in a specific application environment, in addition to using different values of Cell ID and/or RNTI to distinguish each type of discovery message, a Cell may also be utilized. Different values of ID and/or RNTI are used to distinguish different hop counts of UE-to-network relay discovery.

A specific example is given below to indicate various types of discovery messages by adjusting the parameter cell ID and RNTI, for example:

Cell ID=511, RNTI=0; corresponding to UE-to-network relay discovery in the type of discovery message;

Cell ID=511, RNTI=1; group member discovery in the type corresponding to the discovery message (Group Member Discovery);

Cell ID=510, RNTI=0; corresponding to commercial discovery in the type of discovery message;

Cell ID=510, RNTI=1; car-to-node V2X communication in the type corresponding to the discovery message.

In the above, only an achievable method for distinguishing various types of discovery messages by using different parameter values of the cell ID and the RNTI is given, because both the cell ID and the RNTI can take different values within a certain value interval, and the cell ID Different parameter values from RNTI can also be combined, so the above The value of the parameter in the example is only a specific implementation. In a specific implementation, the cell ID and the RNTI may indicate various types of discovery messages by using any other applicable values.

Embodiment 3

In this embodiment, the type information is indicated by a demodulation reference signal (DMRS), and generating type information corresponding to the type of the discovery message includes:

Setting a combination of one or more of a cell identifier (Cell ID), a cyclic shift (CS), and an orthogonal orthogonal code (OCC) corresponding to the type of the discovery message;

A demodulation reference signal corresponding to the type of the discovery message is generated.

In a specific application, the implementation can be:

Table 1 shows the parameters affecting the DMRS sequence, including Cell ID, Cyclic Shift (CS) and Orthogonal Cover Code (OCC). DMRS in existing D2D systems. The Cell ID of the base sequence is set to 510, CS is set to 0, and OCC is set to [11]. In the embodiment of the present invention, in order to distinguish the type of the discovery message, the cell ID, the CS, and the OCC may be set to different values, and thus the generated DMRS is also different, so that the receiving terminal can identify the discovery by detecting the DMRS sequence of the discovery message. The type of message.

A specific example is given below to indicate various types of discovery messages by adjusting the parameter cell ID, CS, and OCC, for example:

Cell ID=511, CS=0; OCC=[11]; corresponding to UE-to-network relay discovery in the type of discovery message;

Cell ID=511, CS=0; OCC=[1-1]; group member discovery in the type of the corresponding discovery message (Group Member Discovery);

Cell ID=510, CS=0; OCC=[11]; corresponding to the commercial discovery in the type of discovery message;

Cell ID=510, CS=1; OCC=[1-1]; corresponding to the car to node V2X in the type of discovery message.

Embodiment 4

The type information is indicated by a mask, and generating type information corresponding to the type of the discovery message includes:

Multiplying a mask corresponding to the type on the cyclic redundancy check code CRC of the discovery message.

In a specific application, the implementation can be:

The existing discovery message uses a 24-bit Cyclic Redundancy Check (CRC). In order to distinguish different types of discovery messages, in this embodiment, a discovery message can be multiplied without changing the CRC length. The mask corresponding to the type to distinguish the different types of discovery messages.

Because the value of the mask can be arbitrarily selected within a reasonable range of values, in order to explain the embodiment, several alternative implementations are provided, for example:

The mask sequence is <101010101010101010101010>; corresponding to the UE-to-network relay discovery in the type of the discovery message;

The mask sequence is <010101010101010101010101>; the group member discovery in the type corresponding to the discovery message (Group Member Discovery);

The mask sequence is <111111111111111111111111>; corresponding to the commercial discovery in the type of the discovery message;

The mask sequence is <1111111111110000000000000>; corresponding to the car to node V2X in the type of discovery message.

After receiving the CRC, the receiving side generates a CRC, and multiplies the generated CRC by a mask sequence corresponding to different types of discovery messages that are preset, and the multiplied result is carried by the received data packet itself. The CRC is compared. When the result of multiplying the mask sequence corresponding to the first type of discovery message by the generated CRC matches the CRC carried by the data packet itself, the type of the received discovery message is the first type.

Embodiment 5

The type information is indicated by the resource pool allocated by the discovery message, and the method for determining the type of the discovery message may be:

Different types of discovery messages are allocated to different resource pools. When a discovery message is sent, a discovery message is transmitted in the corresponding resource pool according to the type of the discovery message.

In a specific application, the implementation can be:

In this embodiment, the distinction is made by assigning different resource pools to different discovery messages. The resource pool may be a base station configuration or a set of predefined time-frequency resources. Resource pools may be independent of each other, or may overlap partially or completely. Depending on the type of the discovery message, the corresponding resource pool is allocated for each type of discovery message, so that the receiving device can receive the discovery message according to the corresponding relationship between the resource pool and the discovery message type. What type of discovery message is, for example, in a specific application:

UE-to-network relay discovery is transmitted in resource pool 1;

Group Member Discovery is launched in resource pool 2;

Commercial Disovery is launched in resource pool 3;

V2X information is transmitted in resource pool 4;

Resource pools 1, 2, 3 and 4 are all configured by the base station or are predefined and broadcast in the cell by means of broadcast. Therefore, when the receiving device receives the discovery message in the resource pool 1, the relationship between the discovery message and the resource pool given in the foregoing example may determine that the type of the received discovery message is UE-to-network relay discovery.

Embodiment 6

As shown in FIG. 2, an embodiment of the present invention provides a method for receiving a PSDCH of a physical side discovery channel, where the first user equipment communicates with the second user equipment by means of a device to device (D2D). The method includes:

Step 201: The second user equipment receives the discovery message (discovery message) sent by the first user equipment.

Step 202: The second user equipment acquires type information corresponding to the type of the discovery message, where The type of the discovery message is determined for the type information.

The type of the discovery message includes UE-to-network relay discovery, Group Member Discovery, commercial discovery, and vehicle to anything (V2X). One or several of them.

In the method provided by the embodiment of the present invention, after receiving the discovery message, the receiving device obtains the type information corresponding to the type of the discovery message, and uses the type information to distinguish different types of discovery messages, thereby avoiding solving all the discovery messages. After the transfer, submit it to the higher level for judgment processing. The power consumption of the terminal is reduced, the power is saved, and the processing complexity of the terminal can be reduced.

In the embodiment of the present invention, the manners that can be used to indicate the type information include multiple types. The information about the type of the receiving device that can be obtained by the receiving device in the following manners based on the different indication manners includes:

Example 7

Corresponding to the type information sending manner used in the second embodiment, when the type information is indicated by the scrambling code of the discovery message, the receiving device acquires type information corresponding to the type of the discovery message, and determines the discovery based on the type information. The types of messages include:

Desmuting the discovery message, and acquiring a scrambling code corresponding to the discovery message;

Determining the type of the discovery message according to a cell identifier (cell ID) and/or a user equipment identifier (RNTI) in the scrambling code.

For example, referring to the specific example provided in the second embodiment, the correspondence between the types of the message and the parameter cell ID and RNTI is as follows:

Cell ID=511, RNTI=0; corresponding to UE-to-network relay discovery in the type of discovery message;

Cell ID=511, RNTI=1; group member discovery in the type corresponding to the discovery message (Group Member Discovery);

Cell ID=510, RNTI=0; corresponding to commercial discovery in the type of discovery message;

Cell ID=510, RNTI=1; car-to-node V2X communication in the type corresponding to the discovery message.

Correspondingly, if the scrambling code obtained by the receiving device is Cell ID=510, RNTI=0; it can be determined that the type of the received discovery message is commercial discovery. Other types of parsing are the same, so I won't go into details here.

Example eight

Corresponding to the type information sending manner adopted in the third embodiment, the type information is indicated by a demodulation reference signal (DMRS), and the receiving side device acquires type information corresponding to the type of the discovery message, and determines the discovery message based on the type information. Types include:

Obtaining a demodulation reference signal corresponding to the discovery message;

A type of the discovery message is determined based on a combination of one or more of a cell identifier (Cell ID), a cyclic shift (CS), and an overlay orthogonal code (OCC) in the demodulation reference signal.

For example, referring to the specific example provided in the third embodiment, the correspondence between the types of the message and the parameter cell ID, CS, and OCC is as follows:

Cell ID=511, CS=0; OCC=[11]; corresponding to UE-to-network relay discovery in the type of discovery message;

Cell ID=511, CS=0; OCC=[1-1]; group member discovery in the type of the corresponding discovery message (Group Member Discovery);

Cell ID=510, CS=0; OCC=[11]; corresponding to the commercial discovery in the type of discovery message;

Cell ID=510, CS=1; OCC=[1-1]; corresponding to the car to node V2X in the type of discovery message.

Correspondingly, if the receiving side device obtains Cell ID=510 from the demodulation reference signal, CS=0; OCC=[11]; then it can be determined that the type of the received discovery message is commercial discovery.

Example nine

Corresponding to the type information sending mode used in the fourth embodiment, the type information is indicated by a mask, The receiving device obtains type information corresponding to the type of the discovery message, and determining the type of the discovery message based on the type information includes:

Obtaining a cyclic redundancy check code (CRC) corresponding to the discovery message;

A type of the discovery message is determined based on a mask corresponding to a cyclic redundancy check code (CRC) of the discovery message.

That is, the receiving side decodes the received data packet to generate a CRC, and multiplies the generated CRC by a mask sequence corresponding to a different type of discovery message set in advance, and multiplies the result and the received data packet itself. The carried CRC is compared. When the result of multiplying the mask sequence corresponding to the generated CRC by the generated CRC matches the CRC carried by the data packet itself, the type of the received discovery message is the first type.

For example, referring to the specific example provided in Embodiment 4, it is found that the correspondence between the various types of messages and the values of the masks is as follows:

The mask sequence is <101010101010101010101010>; corresponding to the UE-to-network relay discovery in the type of the discovery message;

The mask sequence is <010101010101010101010101>; the group member discovery in the type corresponding to the discovery message (Group Member Discovery);

The mask sequence is <111111111111111111111111>; corresponding to the commercial discovery in the type of the discovery message;

The mask sequence is <1111111111110000000000000>; corresponding to the car to node V2X in the type of discovery message.

After decoding the data packet to generate a CRC, multiplying the mask corresponding to the above types by the CRC to obtain four multiplication results; each multiplication result and the CRC originally carried by the data packet (no CRC before decoding) The comparison is performed. If the multiplication result obtained by the mask sequence <1111111111110000000000000> is the same as the originally carried CRC, it can be determined that the type of the received discovery message is the vehicle-to-node V2X.

Example ten

The type information is indicated by the resource pool allocated by the discovery message, and the method for determining the type of the discovery message may be:

Upon receiving the discovery message, the resource pool that receives the discovery message is determined, and the type of the received discovery message is determined according to the correspondence between the pre-stored resource pool and the discovery message type.

In a specific application, the implementation can be:

In this embodiment, the sending side device sends the discovery message because the different resource pools are allocated according to the type of the discovery message. The resource pool may be a base station configuration or a set of predefined time-frequency resources. Resource pools may be independent of each other, or may overlap partially or completely. Therefore, if the receiving device receives the discovery message in a certain resource pool, it can determine the type of the received discovery message according to the correspondence between the resource pool and the discovery message type, for example, in a specific application:

UE-to-network relay discovery is transmitted in resource pool 1;

Group Member Discovery is launched in resource pool 2;

Commercial Disovery is launched in resource pool 3;

V2X information is transmitted in resource pool 4;

Resource pools 1, 2, 3 and 4 are all configured by the base station or are predefined and broadcast in the cell by means of broadcast. Therefore, when the receiving device receives the discovery message in the resource pool 1, the relationship between the discovery message and the resource pool given in the foregoing example may determine that the type of the received discovery message is UE-to-network relay discovery.

Embodiment 11

As shown in FIG. 3, an embodiment of the present invention provides a physical side discovery channel PSDCH sending apparatus 300. The apparatus 300 communicates with a second user equipment by means of a device to device (D2D) mode. The apparatus 300 includes:

a generating unit 301, configured to generate type information corresponding to a type of the discovery message;

The sending unit 302 is configured to send the discovery message and the type information to the second user equipment, where the type information is used to indicate that the second user equipment determines based on the type information. The type of the discovery message.

The type of the discovery message sent by the sending unit 302 includes UE-to-network relay discovery, Group Member Discovery, commercial discovery, and vehicle arrival. One or more of a vehicle to anything (V2X).

In the embodiment of the present invention, the type information may be indicated in various manners. The following provides several optimized solutions, including:

First, the type information is indicated by the scrambling code of the discovery message, and the generating unit 301 is specifically configured to set a cell identifier (cell ID) corresponding to the type of the discovery message when the scrambling code generator is initialized. Or User Equipment Identity (RNTI); controlling the scrambling code generator to generate a scrambling code corresponding to the type of the discovery message.

Second, the type information is indicated by a demodulation reference signal (DMRS), and the generating unit 301 is specifically configured to set a cell identifier (Cell ID), a cyclic shift (CS), and an overlay corresponding to the type of the discovery message. A combination of one or more of orthogonal codes (OCC); generating a demodulation reference signal corresponding to the type of the discovery message.

Third, the type information is indicated by a mask, and the generating unit 301 is specifically configured to multiply a mask corresponding to the type on a cyclic redundancy check code (CRC) of the discovery message.

Example twelve

As shown in FIG. 4, an embodiment of the present invention provides a physical side discovery channel PSDCH receiving apparatus 400. The apparatus 400 communicates with a second user equipment by means of a device to device (D2D) mode. The apparatus 400 includes:

The receiving unit 401 is configured to receive a discovery message sent by the first user equipment and type information corresponding to a type of the discovery message;

The type determining unit 402 is configured to determine a type of the discovery message based on the type information.

The type determining unit 402 is specifically configured to determine, according to the type information, that the type of the discovery message is a UE-to-network relay discovery, a group member. One or more of Group Member Discovery, commercial discovery, and vehicle to anything (V2X).

The receiving device corresponding to the embodiment of the present invention includes:

The type determining unit 402 is specifically configured to perform descrambling on the discovery message to obtain a scrambling code corresponding to the discovery message, according to the cell in the scrambling code. The identity (cell ID) and/or user equipment identity (RNTI) determines the type of discovery message.

Second, the type information is indicated by a demodulation reference signal (DMRS), and the type determining unit 402 is specifically configured to acquire a demodulation reference signal corresponding to the discovery message; based on a cell identifier in the demodulation reference signal ( The combination of one or more of Cell ID), Cyclic Shift (CS), and Overlay Orthogonal Code (OCC) determines the type of discovery message.

Third, the type information is indicated by a mask, and the type determining unit 402 is specifically configured to acquire a cyclic redundancy check code (CRC) corresponding to the discovery message; and a cyclic redundancy check code based on the discovery message. The mask corresponding to (CRC) determines the type of the discovery message.

Example thirteen

As shown in FIG. 5, the embodiment of the present invention provides a user equipment 500. The user equipment 500 communicates with a second user equipment by using a device-to-device (D2D) mode. The user equipment 500 includes:

The processor 501 is configured to generate type information corresponding to a type of the discovery message.

a transmitter 502, configured to send the discovery message and the type information to the second user equipment, where the type information is used to indicate that the second user equipment determines the discovery message based on the type information. Types of.

The type of the discovery message sent by the transmitter 502 includes UE-to-network relay discovery, Group Member Discovery, commercial discovery, and vehicle arrival. One or more of a vehicle to anything (V2X).

In the embodiment of the present invention, the type information may be indicated in various manners. The following provides several optimized solutions, including:

First, the type information is indicated by the scrambling code of the discovery message, and the processor 501 is specifically configured to set a cell identifier (cell ID) corresponding to the type of the discovery message when the scrambling code generator is initialized. Or User Equipment Identity (RNTI); controlling the scrambling code generator to generate a scrambling code corresponding to the type of the discovery message.

Second, the type information is indicated by a demodulation reference signal (DMRS), and the processor 501 is specifically configured to set a cell identifier (Cell ID), a cyclic shift (CS), and an overlay corresponding to the type of the discovery message. A combination of one or more of orthogonal codes (OCC); generating a demodulation reference signal corresponding to the type of the discovery message.

Third, the type information is indicated by a mask, and the processor 501 is specifically configured to multiply a mask corresponding to the type on a cyclic redundancy check code (CRC) of the discovery message.

Embodiment 14

As shown in FIG. 6, the embodiment of the present invention provides a user equipment 600. The apparatus 600 communicates with a second user equipment by means of a device to device (D2D). The apparatus 600 includes:

The receiver 601 is configured to receive a discovery message sent by the first user equipment and type information corresponding to a type of the discovery message.

The processor 602 is configured to determine a type of the discovery message based on the type information.

The processor 602 is specifically configured to determine, according to the type information, that the type of the discovery message is a UE-to-network relay discovery, a group member discovery, or a business discovery. Commercial discovery) and one or more of vehicle to anything (V2X).

The receiving device corresponding to the embodiment of the present invention includes:

The processor 602 is specifically configured to descramble the discovery message to obtain a scrambling code corresponding to the discovery message, according to the scrambling code of the discovery message, according to the scrambling code. A cell identifier (cell ID) and/or a User Equipment Identity (RNTI) determines the type of the discovery message.

Second, the type information is indicated by a demodulation reference signal (DMRS), where the processor 602 is specifically configured to acquire a demodulation reference signal corresponding to the discovery message; based on a cell identifier in the demodulation reference signal (Cell The combination of one or more of ID), cyclic shift (CS), and superposition orthogonal code (OCC) determines the type of the discovery message.

Third, the type information is indicated by a mask, where the processor 602 is specifically configured to acquire a cyclic redundancy check code (CRC) corresponding to the discovery message; and a cyclic redundancy check code based on the discovery message ( The corresponding mask of the CRC) determines the type of the discovery message.

The above one or more technical solutions in the embodiments of the present application have at least the following technical effects:

The method and the device provided by the present invention send the indication information indicating the type of the discovery message when the discovery message is sent, so that the receiving side device can distinguish different types of discovery messages according to the indication information at the physical layer, and then the receiving side device can Only the required discovery message is demodulated, thereby reducing the power consumption of the receiving device, saving power, and reducing the complexity of processing the discovery message by the receiving device.

The method described in the present invention is not limited to the embodiments described in the specific embodiments, and other embodiments are obtained by those skilled in the art according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims (20)

A physical side-stream discovery channel PSDCH transmission method is characterized in that: the first user equipment and the second user equipment communicate by using the device-to-device D2D manner, the method includes: The first user equipment generates type information corresponding to a type of the discovery message; The first user equipment sends the discovery message and the type information to the second user equipment, where the type information is used to indicate that the second user equipment determines the discovery message based on the type information. Types of. The method of claim 1, wherein the type of the discovery message comprises one or more of user equipment to network relay discovery, group member discovery, business discovery, and vehicle-to-node V2X. The method according to any one of claims 1 to 2, wherein the type information is generated by the scrambling code of the discovery message, and the generating type information corresponding to the type of the discovery message includes: Setting a cell identifier cell ID and/or a user equipment identifier RNTI corresponding to the type of the discovery message when the scrambling code generator is initialized; Generating a scrambling code corresponding to the type of the discovery message. The method according to any one of claims 1 to 2, wherein the type information is generated by demodulating the reference signal DMRS, and the generating the type information corresponding to the type of the discovery message comprises: Setting a combination of one or more of a cell identifier Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC corresponding to the type of the discovery message; A demodulation reference signal corresponding to the type of the discovery message is generated. The method according to any one of claims 1 to 2, wherein the type information is indicated by a mask, and the generating the type information corresponding to the type of the discovery message comprises: Multiplying a mask corresponding to the type on the cyclic redundancy check code CRC of the discovery message. A physical side line discovery channel PSDCH receiving method, characterized in that: the first user setting The second user equipment communicates with the second user equipment through the device to device D2D mode, and the method includes: Receiving, by the second user equipment, a discovery message sent by the first user equipment and type information corresponding to a type of the discovery message; The second user equipment determines the type of the discovery message based on the type information. The method of claim 6, wherein the type of the discovery message comprises one or more of user equipment to network relay discovery, group member discovery, business discovery, and vehicle-to-node V2X. The method according to any one of claims 6 or 7, wherein the type information is determined by the scrambling code of the discovery message, and determining the type of the discovery message based on the type information includes: Desmuting the discovery message, and acquiring a scrambling code corresponding to the discovery message; Determining the type of the discovery message according to the cell identity cell ID and/or the user equipment identity RNTI in the scrambling code. The method according to any one of claims 6 or 7, wherein the type information is determined by the demodulation reference signal DMRS, and the determining the type of the discovery message based on the type information comprises: Obtaining a demodulation reference signal corresponding to the discovery message; The type of the discovery message is determined based on a combination of one or more of a cell identity Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC in the demodulation reference signal. The method according to any one of claims 6 or 7, wherein the type information is indicated by a mask, and the determining the type of the discovery message based on the type information comprises: Obtaining a cyclic redundancy check code CRC corresponding to the discovery message; A type of the discovery message is determined based on a mask corresponding to the cyclic redundancy check code CRC of the discovery message. A physical side discovery channel PSDCH transmitting device, wherein the device communicates with a second user equipment by means of a device to device D2D mode, the device comprising: a generating unit, configured to generate type information corresponding to a type of the discovery message; a sending unit, configured to send the discovery message and the type information to the second user equipment, where the type information is used to indicate that the second user equipment determines the type of the discovery message based on the type information . The apparatus according to claim 11, wherein the type of the discovery message sent by the sending unit comprises one of user equipment to network relay discovery, group member discovery, business discovery, and vehicle-to-node V2X or Several. The device according to any one of claims 11 or 12, wherein the type information is indicated by a scrambling code of the discovery message, and the generating unit is specifically configured to set and start when the scrambling code generator is initialized. Generating a cell identifier cell ID and/or a user equipment identifier RNTI corresponding to the type of the discovery message; controlling the scrambling code generator to generate a scrambling code corresponding to the type of the discovery message. The device according to any one of claims 11 or 12, wherein the type information is indicated by the demodulation reference signal DMRS, and the generating unit is specifically configured to set a cell identifier corresponding to the type of the discovery message. A combination of one or more of a Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC; generating a demodulation reference signal corresponding to the type of the discovery message. The device according to any one of claims 11 or 12, wherein the type information is indicated by a mask, and the generating unit is specifically configured to multiply the cyclic redundancy check code CRC of the discovery message. The mask corresponding to the type. A physical sideline discovery channel PSDCH receiving device, wherein the device communicates with a second user equipment by means of a device to device D2D mode, the device comprising: a receiving unit, configured to receive a discovery message sent by the first user equipment and type information corresponding to a type of the discovery message; And a type determining unit, configured to determine a type of the discovery message based on the type information. The device according to claim 16, wherein the type determining unit is specifically configured to determine, according to the type information, the type of the discovery message as user equipment to network relay discovery, group member discovery, business discovery, and vehicle To one or several of the nodes V2X. The device according to any one of claims 16 or 17, wherein the type information is indicated by a scrambling code of the discovery message, and the type determining unit is specifically configured to use the discovery The information is descrambled, and the scrambling code corresponding to the discovery message is obtained; and the type of the discovery message is determined according to the cell identifier cell ID and/or the user equipment identifier RNTI in the scrambling code. The apparatus according to any one of claims 16 or 17, wherein the type information is indicated by the demodulation reference signal DMRS, and the type determining unit is specifically configured to acquire a demodulation reference signal corresponding to the discovery message. And determining a type of the discovery message based on a combination of one or more of a cell identifier Cell ID, a cyclic shift CS, and a superposition orthogonal code OCC in the demodulation reference signal. The device according to any one of claims 16 or 17, wherein the type information is indicated by a mask, and the type determining unit is specifically configured to acquire a cyclic redundancy check code CRC corresponding to the discovery message. Determining the type of the discovery message based on a mask corresponding to the cyclic redundancy check code CRC of the discovery message.

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