CN111432348A - A method, device and system for scrambling data channel of terminal direct unicast communication - Google Patents

Abstract

The present application provides a method, device and system for scrambling a data channel of terminal direct unicast communication. The method includes: acquiring the SL dedicated terminal identifier of the terminal, the SL dedicated terminal identifier of the destination terminal corresponding to the SL unicast communication, and this The SL dedicated link identifier for unicast communication between the terminal and the destination terminal; the SCI carried by the PSCCH and the data carried by the PSSCH are sent to the destination terminal; wherein, when the data is sent, the obtained SL dedicated link identifier is used for scrambling ; Carry the SL dedicated terminal identifiers of the terminal and the destination terminal in the SCI, so that the destination terminal determines itself as the destination terminal, and uses the corresponding SL dedicated link identifier to descramble the received data. The method can increase the underlying communication security of terminal-to-terminal unicast communication.

Description

A method, device and system for scrambling data channel of terminal direct unicast communication

technical field

The present invention relates to the field of communication technologies, and in particular, to a method, device and system for scrambling a data channel of terminal direct unicast communication.

Background technique

Direct communication (SL) for terminal direct communication (D2D) communication, including physical direct communication control channel (PSCCH) and physical direct communication data channel (Physical sidelink share channel, PSSCH) channel, respectively carrying the direct communication indicating the detection of PSSCH Control indication (Sidelink control indication, SCI) and data information, and correspond to sidelink control channel and data channel respectively.

The existing standard LTE supports four SL transmission modes: Mode1, Mode2, Mode3, and Mode4. Among them, Mode1 and Mode2 are for non-V2X communication scenarios, and their PSCCHs use SCI format0, while Mode3 and Mode4 are for V2X communication scenarios, and their PSCCHs use SCI format1 . Mode1 and Mode3 belong to the transmission modes that are covered by base stations and allocate PSSCH resources based on base station scheduling, and Mode2 and Mode4 belong to transmission modes that select PSSCH resources in a distributed manner based on the pre-assigned SL resource pool.

For the control channel PSCCH and the data channel PSSCH of the SL, scrambling is initialized using different sequences. Specifically:

Control channel PSCCH scrambling: the scrambler sequence generator is initialized with c _init =510;

进行初始化：Data channel PSSCH scrambling: the scrambler sequence generator utilizes

To initialize:

表示Mode1和Mode2对应控制信道SCI format0中包含的字段Group Destination ID取值(为对应系统分配目的节点Group ID(组播oneto many通信场景)或者Destination ID(单播one to one通信场景)的低8位)；For Mode1 and Mode2, where

Indicates that Mode1 and Mode2 correspond to the value of the field Group Destination ID contained in the control channel SCI format0 (the lower 8 of the destination node Group ID (multicast one to many communication scenario) or Destination ID (unicast one to one communication scenario) is assigned to the corresponding system bit);

参数p和L对应为指示该PSSCH传输的控制信道PSCCH的CRC序列相关的比特位取值和长度。For Mode3 and Mode4, where

The parameters p and L correspond to the bit value and length related to the CRC sequence indicating the control channel PSCCH of the PSSCH transmission.

As mentioned above, for Mode1 and Mode2, unicast, multicast and broadcast communication scenarios are supported, and the corresponding destination node ID is included in the SCI field Group Destination ID carried by the control channel. The broadcast scene corresponds to the Group ID. The above ID information is related to the service type in R14, and can be allocated by the system or the terminal has been set in the terminal device. The receiving node detects the destination node ID in the SCI, and if it determines that the last 8 bits of its own ID or Group ID are the same as the ID in the detected SCI, it further uses the ID to descramble the data channel PSSCH. The source node ID and destination node ID are included in the MAC header of the PSSCH corresponding to Mode1 and Mode2. When the receiving node further determines that the destination node ID contained in the detected PSSCH MAC header is the same as its own ID or GroupID, the MAC packet is further Pass to upper layers for detection.

For Mode3 and Mode4, only broadcast scenarios are supported. The scrambling of PSCCH and PSSCH sent by the source node has nothing to do with the destination node ID, and the surrounding nodes can detect control information and data information.

In addition to Mode3 and Mode4, Mode1 and Mode2 are also broadcast communication in essence. The surrounding nodes can detect the SCI information on the PSCCH. The node identifies whether the ID information in the SCI matches itself to determine whether to further detect the PSSCH, and then identifies the MAC detected by the PSSCH. Whether the destination node ID in the header matches with itself determines whether to submit it to the upper layer for further detection. However, the surrounding nodes have obtained the ID information for detecting the PSSCH and the destination node ID information (MAC header) decrypted by the PDCP layer, and can detect the PSSCH and send the upper layer to decrypt the PDCP packet.

SUMMARY OF THE INVENTION

In view of this, the present application provides a method, device, and system for scrambling a data channel of terminal-through unicast communication, which can increase the underlying communication security of terminal-to-terminal unicast communication.

In order to solve the above-mentioned technical problems, the technical solution of the present application is realized as follows:

A terminal direct unicast communication data channel scrambling system, the system comprising: a first terminal and a second terminal;

The first terminal obtains the SL dedicated terminal identifier of the terminal, the SL dedicated terminal identifier of the second terminal corresponding to the SL unicast communication, and the SL dedicated link identifier of the unicast communication between the terminal and the second terminal; sending to the second terminal The SCI carried by the PSCCH and the data carried by the PSSCH; wherein, when sending data, use the obtained SL dedicated link identification for scrambling; The SL dedicated terminal identification of the terminal and the destination terminal is carried in the SCI;

The second terminal obtains the SL dedicated terminal identification of the terminal and the SL dedicated link identification for unicast communication with the first terminal; when receiving the SCI sent by the first terminal, it determines itself as the purpose according to the SL dedicated terminal identification in the SCI The terminal, and the SL dedicated link identifier corresponding to the current SL unicast communication, and use the corresponding SL dedicated link identifier to descramble the received data.

A method for scrambling a direct-to-terminal unicast communication data channel, which is applied to a terminal serving as a source node, and the method includes:

Obtain the SL dedicated terminal identifier of the terminal, the SL dedicated terminal identifier of the destination terminal corresponding to the SL unicast communication, and the SL dedicated link identifier of the unicast communication between the terminal and the destination terminal; send the SCI carried by PSCCH and the SL dedicated link to the destination terminal. The data carried by PSSCH; wherein, when sending data, use the obtained SL dedicated link identifier for scramble; carry the SL dedicated terminal identifiers of the terminal and the destination terminal in the SCI, so that the destination terminal can determine itself as the destination terminal, and use the corresponding SL dedicated link identifier to descramble the received data.

A direct-to-terminal unicast communication data channel scrambling device includes a processor configured to execute the steps of a method for scrambling a direct-to-terminal unicast communication data channel.

A non-transitory computer-readable storage medium that stores instructions that, when executed by a processor, cause the processor to perform the steps of a method for scrambling a direct-to-terminal unicast communication data channel.

As can be seen from the above technical solutions, the present application allocates the SL dedicated terminal identifier to the SL communication terminal, and allocates the SL dedicated link identifier for the SL communication link for scrambling the data channel, so as to support the terminal when performing unicast communication, Only the destination node can find the SL dedicated link ID between the source node and the destination node according to the SL dedicated terminal ID of the source node, so as to perform data descrambling. This solution can increase the underlying communication security of terminal-to-terminal unicast communication.

Description of drawings

FIG. 1 is a schematic diagram of a scrambling system for a terminal direct unicast communication data channel in an embodiment of the present application;

FIG. 2 is a schematic diagram of a data channel scrambling process of a terminal direct unicast communication in an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

An embodiment of the present application provides a terminal-through unicast communication data channel scrambling system, the system including: a plurality of terminals and a base station;

Since the embodiment of the present application provides terminal direct unicast communication, two terminals corresponding to one SL unicast communication: a first terminal and a second terminal are taken as an example.

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a data channel scrambling system for terminal direct unicast communication in an embodiment of the present application. In FIG. 1 , a first terminal and a second terminal that need to perform SL unicast communication are taken as an example, wherein the first terminal is used as a source node, and the second terminal is used as a destination node.

Step 1: The first terminal obtains the SL dedicated terminal identifier of the terminal, the SL dedicated terminal identifier of the second terminal corresponding to the SL unicast communication, and the SL dedicated link identifier of the unicast communication between the terminal and the second terminal.

The second terminal acquires the SL dedicated terminal identifier of the terminal and the SL dedicated link identifier for unicast communication with the first terminal.

The method for each terminal in the system to obtain its own SL dedicated terminal identification can be obtained through base station allocation, or can be obtained through local configuration of the terminal, wherein the method of obtaining based on base station allocation is as follows:

The base station obtains the SL dedicated terminal identifiers of the first terminal and the second terminal, and sends them to the corresponding terminal through RRC or DCI signaling.

There are two ways for the base station to obtain the SL dedicated terminal identifier of the first terminal and the second terminal:

The first is that the SL dedicated terminal identifier of each terminal is configured on the base station, which is obtained from the local configuration information;

Second, the ProSe UE ID allocated by the upper layer, such as the application layer, is used as the SL dedicated terminal identifier of the terminal, which is the ID corresponding to the SRC field in the MAC SL-SCH header in LTE.

The base station obtains the ProSe UE ID allocated by the upper layer as the SL dedicated terminal identifier of the terminal.

When the base station sends the SL dedicated terminal identifier of the terminal to the terminal, it can use RRC signaling or DCI signaling, as follows:

Via RRC signaling:

When a terminal requests a dedicated SL communication resource configuration from the base station, the base station sends the SL dedicated resource configuration to the terminal including the SL dedicated terminal identifier used by the terminal for SL data channel detection.

For example, the terminal sends SidelinkUEInformation to the base station through RRC signaling, notifying the base station of the sending frequency band and receiving frequency band used by the terminal for SL communication, as well as the SL communication destination node ID and other information;

In the RRC signaling sent by the base station to the terminal, the identification part of the SL-CommConfig will include a new field, in addition to the SL-RNTI, which is used to detect the DCI sent by the base station to the UE indicating the SL PSCCH and PSSCH resources, which is used to carry the SL dedicated terminal identification. , used to detect the SL data channel.

For DCI signaling, after the terminal goes online, it can notify each terminal of the SL dedicated terminal identifier through DCI; or after the terminal requests dedicated SL communication resource configuration, it can notify the terminal through DCI of the corresponding SL dedicated terminal identifier.

The first terminal receives the RRC signaling or DCI signaling sent by the base station and obtains and stores the SL dedicated terminal identifier carried in the signaling;

The second terminal receives the RRC signaling or DCI signaling sent by the base station, obtains and stores the SL dedicated terminal identifier carried in the signaling.

There may be various methods for each terminal in the system to obtain the SL dedicated terminal identifier of the opposite terminal, taking the first terminal and the second terminal as examples, specifically:

The first:

The first terminal sends the acquired SL dedicated terminal identifier of the terminal to other terminals by broadcasting; when receiving the SL dedicated terminal identifier broadcasted by other terminals, acquires the SL dedicated terminal identifier of the corresponding terminal.

The second terminal sends the acquired SL dedicated terminal identifier of the terminal to other terminals by broadcasting; when receiving the SL dedicated terminal identifier broadcasted by other terminals, it acquires the SL dedicated terminal identifier of the corresponding terminal.

In this implementation, the SL dedicated terminal identification attribute is open to the outside world, that is, the terminal can inform the surrounding nodes of its own SL dedicated terminal identification, and when receiving the SL dedicated terminal identification broadcast by the surrounding nodes, it can learn the SL dedicated terminal identification of the corresponding terminal. .

the second;

The first terminal broadcasts a request for the SL dedicated terminal identification of the surrounding terminals; when receiving the SL dedicated terminal identification responded by the second terminal, the SL dedicated terminal identification of the second terminal is obtained;

The second terminal, when receiving the SL dedicated terminal identification request sent by the first terminal, responds the SL dedicated terminal identification of the terminal to the first terminal.

In this manner, when the first terminal as the source node needs to communicate with the second terminal as the destination node, the first terminal broadcasts a request for SL dedicated terminal identification to surrounding terminals to obtain the SL dedicated terminal identification of the second terminal.

The third:

When receiving the SL dedicated terminal identification reported by each terminal, the base station stores the SL dedicated terminal identification corresponding to each terminal respectively;

The first terminal sends a request to the base station to obtain the SL dedicated terminal identity of the second terminal; when receiving the SL dedicated terminal identity of the second terminal responded by the base station, obtains the SL dedicated terminal identity of the second terminal;

The base station, when receiving the request for acquiring the SL-specific terminal identifier of the second terminal sent by the first terminal, responds to the SL-specific terminal identifier of the second terminal to the first terminal.

This method is that when the first terminal as the source node needs to communicate with the second terminal as the destination node, the first terminal sends an SL dedicated terminal identification request to the base station to obtain the SL dedicated terminal identification of the second terminal, which is similar to that in LTE. The known Group ID, which is related to the service type of SL communication.

There are two ways to obtain the SL dedicated link identifier:

The first case:

The base station does not support the allocation of the SL dedicated link identifier or does not allocate the SL dedicated link identifier through the base station, then the SL dedicated link identifier may use part or all of the bits of the SL dedicated terminal identification of the first terminal, or the SL dedicated terminal identification of the second terminal. Part or all of the bits, or the identification related to the dedicated terminal identification of the first terminal SL and the dedicated terminal identification of the second terminal SL is calculated according to the setting rule, or the identification of the SL dedicated link determined by the first terminal and notified to the second terminal. SL dedicated link identifier;

The SL dedicated link identifier may adopt part or all of the bits of the dedicated terminal identification of the first terminal SL, or part or all of the bits of the dedicated terminal identification of the second terminal SL, or it can be calculated according to the setting rule with the SL dedicated terminal identification of the first terminal and the dedicated terminal identification of the first terminal. For the three implementation manners of the identification related to the dedicated terminal identification of the second terminal SL, the corresponding implementation manners can be pre-agreed at both ends of the first terminal and the second terminal. In order to ensure that the SL dedicated link identifiers determined at both ends are the same, so as to realize the correct descrambling of data.

Second case:

The base station supports the allocation of the SL dedicated link identifier, and the SL dedicated link identifier is allocated by the base station. There are the following two implementation methods:

The first type: This implementation is to obtain the SL dedicated link ID separately after first obtaining the SL dedicated terminal ID of the destination node.

The first terminal requests the base station for the SL dedicated link ID corresponding to the SL dedicated terminal ID of the second terminal; when receiving the SL dedicated link ID responded by the base station through DCI signaling or RRC signaling, obtains the SL dedicated link ID corresponding to the destination terminal. link identification;

The base station, when receiving the request from the terminal for the SL dedicated link identifier, responds to the first terminal through DCI signaling or RRC signaling with the SL dedicated link identifier corresponding to the requested second terminal, and sends the SL dedicated link identifier to the first terminal. The identification is sent to the second terminal;

The second terminal, upon receiving the SL dedicated link identifier sent by the base station, obtains the SL dedicated link identifier corresponding to when the second terminal is used as the destination terminal of the first terminal.

When specifically implemented in the embodiment of the present application, the SL dedicated link identifier corresponding to one destination node may be requested each time, or the SL dedicated link identifiers corresponding to multiple destination nodes may be requested at the same time. The SL link identifier is taken as an example: the DCI or RRC signaling contains the SL dedicated terminal identifier list corresponding to the destination node of the SL communication, as follows:

SL Destination ID list={Node ID0, Node ID1, ..., Node IDN}

method one:

Indication via DCI:

A new DCI signaling can be designed, through which the SL-related communication terminals (including the source node and the destination node) are informed of the SL dedicated link identifier used for the SL unicast communication. The signaling format can be set as contained in Table 1.

Table 1

Field 1 and Field 2 in Table 1 can be combined into one field during specific implementation. For example, the combined field is designed to contain N elements, each element has M bits, of which the first L bits represent the SL dedicated terminal identifier, and the last M-L bits bit represents the corresponding SL dedicated link identifier;

If the base station obtains the SL dedicated terminal identification list of the destination node corresponding to the SL communication by the terminal through UCI or RRC signaling, field 2 can be omitted, and the nth SL dedicated link identification Dedicated SL IDn in field 1 is sent to the base station by the terminal. corresponding to the nth SL dedicated terminal identifier Node IDn in the SL Destination ID list in the UCI or RRC signaling;

If no new DCI format is designed, the fields to be added to the existing DCI format related to indicating SL communication include field 1 and field 2 in Table 1, where field 2 can be omitted according to the above description.

After the SL source node and the destination node receive the above newly designed DCI signaling, they can know that when they perform SL communication with the terminal corresponding to the SL dedicated terminal identifier indicated in the DCI, the SL dedicated link required to descramble the data channel PSSCH logo.

Method 2: Indicate through RRC signaling:

The dedicated RRC signaling sent by the base station to the terminal, for example, SL-CommConfig contains the SL dedicated link identifier list for SL communication for the terminal and the SL dedicated terminal identifier list of another node corresponding to the SL, where the SL dedicated link identifier The list is as follows:

Dedicated SL ID list={Dedicated SL ID0, Dedicated SL ID1, ..., Dedicated SL IDN};

The list of SL-specific terminal identifiers of another node corresponding to the SL is as follows:

SL Destination ID list={Node ID0, Node ID1, ..., Node IDN}.

Wherein, for the nth SL dedicated link identifier of the Dedicated SL ID list, the Dedicated SL IDn corresponds to the nth SL dedicated terminal identifier Node IDn in the SLDestination ID list.

The above-mentioned Dedicated SL ID list and SL Destination ID list can be combined into a list. For example, the combined list is designed to contain N elements, and each element has M bits. The first L bits represent the SL dedicated terminal identifier, and the last M-L bits represent the SL dedicated terminal identifier. The corresponding SL dedicated link identifier;

If the base station obtains the SL dedicated terminal identification list of the destination node corresponding to the SL communication of the terminal through UCI or RRC signaling, the SL Destination ID list can be omitted. It corresponds to the nth SL dedicated terminal identifier Node IDn in the SL Destination ID list in the UCI or RRC signaling sent to the base station.

According to the above description, one SL unicast communication link corresponds to one SL dedicated link ID, that is, it is assumed that the two SL dedicated terminal IDs related to SL unicast communication are NodeID1 and NodeID2 respectively, and the SL dedicated link ID is DedicatedSL ID0. When NodeID1 sends data to NodeID2, its PSSCH channel is scrambled based on Dedicated SL ID0. Similarly, when NodeID2 sends data to NodeID1, its PSSCH channel is scrambled based on Dedicated SL ID0.

According to the above description, when the base station sends the SL dedicated link identification list and the SL dedicated terminal identification list corresponding to SL unicast communication to the UE through DCI or RRC signaling, it does not need two communication nodes related to SL (the source node and the destination node). ) are notified in advance of the SL dedicated terminal list identification of the destination node through UCI or RRC signaling, and the SL dedicated terminal list identification related to SL unicast communication of a node can be known through UCI or RRC signaling sent by other nodes, so that the base station can The node directly indicates the SL dedicated link identification list and the SL dedicated terminal identification list corresponding to the SL unicast communication through DCI or RRC signaling.

The second: this method is to request the corresponding SL dedicated link identification at the same time when the base station requests the SL dedicated terminal identification of the destination node. Taking the first terminal request as an example, the specific implementation process is as follows:

The first terminal sends a request for acquiring the SL dedicated terminal identifier of the second terminal and the corresponding SL dedicated link identifier to the base station; and receives the SL dedicated terminal identifier of the second terminal responded by the base station, and the corresponding SL dedicated link identifier When , obtain the SL dedicated terminal identifier of the second terminal, and the corresponding SL dedicated link identifier;

The base station, when receiving the request for the SL dedicated terminal identification of the destination terminal and the corresponding SL dedicated link identification sent by the terminal, obtains the SL dedicated terminal identification of the destination terminal and the corresponding SL dedicated link identification and responds to the terminal; and sending the SL dedicated link identifier to the second terminal;

The second terminal, upon receiving the SL dedicated link identifier sent by the base station, obtains the SL dedicated link identifier corresponding to when the second terminal is used as the destination terminal of the first terminal.

So far, the SL-specific terminal identifier and the SL-specific link identifier are obtained.

In the second step, the first terminal sends the SCI carried by the PSCCH and the data carried by the PSSCH to the second terminal; wherein, when sending the data, the obtained SL dedicated link identifier is used for scramble; in the SCI It carries the SL-specific terminal identifiers of the terminal and the destination terminal.

The first terminal, when determining that the SCI is a dedicated SCI, uses the acquired corresponding SL dedicated link identifier to scramble and then sends it to the second terminal; wherein the resource location information occupied by the dedicated SCI is indicated in the public SCI, or Indicated in PSCCH;

The second terminal, when receiving the dedicated SCI sent by the first terminal, uses the obtained corresponding SL dedicated link identifier to perform descrambling.

Step 3: When the second terminal receives the SCI sent by the first terminal, it determines itself as the destination terminal according to the SL dedicated terminal identifier in the SCI, and the SL dedicated link identifier corresponding to the current SL unicast communication, and uses the corresponding SL The dedicated link identifier descrambles the received data.

The source node (the first terminal) of the SL unicast communication sends the SCI to the destination node (the second terminal), where the SCI contains the SL-specific terminal identifiers of the source node and the destination node, or an identifier that can be uniquely mapped to the SL-specific terminal identifier information, so that the destination node can know whether it is the corresponding destination node by detecting the SCI information, and can perform descrambling according to the corresponding SL dedicated link identifier. Wherein, the SCI may not be scrambled or the scrambled mode in the PSCCH in LTE may be adopted, so as to support that all surrounding nodes can detect the SCI information.

The data sent by the source node UE of the SL unicast communication to the destination node is carried by the data channel PSSCH, and the initialization value of the PSSCH scrambler sequence generator is related to the SL dedicated link identifier.

The destination node (second terminal) of the SL unicast communication performs descrambling detection on the PSSCH according to the SL dedicated link identifier.

In the embodiment of the present application, it can be further extended to support the terminal to divide the SCI into a public SCI and a dedicated SCI part when performing SL unicast communication, wherein the dedicated SCI and the data channel are both scrambled with the SL dedicated link identifier.

For the public SCI, it may contain information that can be notified to any surrounding node, including indicating the location information of the corresponding dedicated SCI and data channel resources, and the SL-specific terminal identifiers of the source node and the destination node. When a surrounding node detects a public SCI, it can learn its dedicated SCI and data channel resource location information, so as to provide a reference for subsequent resource selection of its own SL communication, and judge whether it needs to further detect the dedicated SCI according to the SL dedicated terminal identifier of the destination node.

For the dedicated SCI, information such as MCS and hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) required to support the surrounding nodes to further detect data may be included. The resource location information of the dedicated SCI information can be indicated by a field in the common SCI, or incorporated into the PSSCH, and its resource location in the PSSCH is set by the system.

The destination node (second terminal) corresponds to the SL dedicated link ID according to the SL dedicated terminal ID of the source node and the destination node in the common SCI, and performs scramble detection on the dedicated SCI and data channel according to the SL dedicated link ID.

The method further includes:

The second terminal uses the corresponding SL dedicated link identifier for scrambling when sending HARQ feedback or channel information measurement feedback to the first terminal;

The first terminal, when receiving the HARQ feedback or the channel information measurement feedback sent by the second terminal, uses the corresponding SL dedicated link identifier for descrambling.

That is to say, the first terminal sends information to the second terminal, and the information sent by the second terminal and the first terminal is scrambled and descrambled using the same SL dedicated link identifier allocated by the base station; the base station allocates a global Unique link identifier.

Based on the same inventive concept, an embodiment of the present application also provides a method for scrambling a data channel of a terminal direct unicast communication, which is applied to a terminal serving as a source node. Referring to FIG. 2 , FIG. 2 is a schematic diagram of a data channel scrambling process of a terminal direct unicast communication in an embodiment of the present application. The specific steps are:

Step 201, the terminal serving as the source node obtains the SL dedicated terminal identifier of the terminal, the SL dedicated terminal identifier of the destination terminal corresponding to the SL unicast communication, and the SL dedicated link identifier of the unicast communication between the terminal and the destination terminal.

The method for the terminal to obtain the SL dedicated terminal identifier of the terminal is as follows:

Obtain the SL dedicated terminal identifier of the terminal configured locally;

or,

After receiving the RRC signaling or DCI signaling sent by the base station, the SL dedicated terminal identifier carried in the signaling is acquired and stored.

The method for the terminal serving as the source node to obtain the SL-specific terminal identifier of the destination terminal is as follows:

Send the acquired SL dedicated terminal identification of the terminal to other terminals by broadcasting; when receiving the SL dedicated terminal identification broadcasted by other terminals, obtain the SL dedicated terminal identification of the corresponding terminal;

or,

Broadcast the SL dedicated terminal identification request of the surrounding terminals; when receiving the SL dedicated terminal identification responded by the surrounding terminals, obtain the SL dedicated terminal identification of the corresponding terminal;

or,

Send a request for obtaining the SL dedicated terminal identifier of the target terminal to the base station; when receiving the SL dedicated terminal identifier of the target terminal responded by the base station, obtain the SL dedicated terminal identifier of the target terminal.

The method for the terminal serving as the source node to obtain the corresponding SL dedicated link identifier is as follows:

If the base station does not support the allocation of the SL dedicated link identifier or does not assign the SL dedicated link identifier through the base station, the SL dedicated link identifier uses part or all of the bits of the SL dedicated terminal identification of the first terminal, or the SL dedicated terminal identification of the second terminal. Part or all of the bits, or calculate the identities related to the SL dedicated terminal identity of the first terminal and the SL dedicated terminal identity of the second terminal according to the set rule, or the first terminal determines the SL dedicated link identity and notifies the SL of the second terminal. Dedicated link identification;

If the base station supports the allocation of the SL dedicated link identifier, and the SL dedicated link identifier is allocated by the base station, the SL dedicated link identifier is obtained in the following manner:

Request the SL dedicated link ID corresponding to the SL dedicated terminal ID of the destination terminal from the base station;

When receiving the SL dedicated link ID responded by the base station through DCI signaling or RRC signaling, obtain the SL dedicated link ID corresponding to the destination terminal.

The method for the terminal serving as the source node to obtain the SL dedicated terminal identifier of the destination terminal and the corresponding SL dedicated link identifier is as follows:

Send a request for acquiring the SL dedicated terminal identifier of the destination terminal and the corresponding SL dedicated link identifier to the base station;

When receiving the SL dedicated terminal identifier of the destination terminal and the corresponding SL dedicated link identifier that the base station responds to, the SL dedicated terminal identifier of the destination terminal and the corresponding SL dedicated link identifier are obtained.

Step 202, the terminal sends the SCI carried by the PSCCH and the data carried by the PSSCH to the destination terminal; wherein, when sending the data, use the obtained SL dedicated link identifier for scramble; carry the terminal in the SCI and the SL dedicated terminal identifier of the destination terminal, so that the destination terminal determines itself as the destination terminal, and uses the corresponding SL dedicated link identifier to descramble the received data.

When the SCI is a dedicated SCI, it is scrambled using the acquired corresponding SL dedicated link identifier and then sent; wherein, the resource location information occupied by the dedicated SCI is indicated in the public SCI, or indicated in the PSCCH.

The method further includes:

When receiving the HARQ feedback or the channel information measurement feedback sent by the destination terminal, use the corresponding SL dedicated link identifier for descrambling; wherein the HARQ feedback or the channel information measurement feedback is obtained by the destination terminal using the Corresponding to SL dedicated link identification scrambling.

Based on the same inventive concept, an embodiment of the present application also provides an apparatus for scrambling a data channel of direct-to-terminal unicast communication. step.

Based on the same inventive concept, embodiments of the present application further provide a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores instructions, characterized in that, when the instructions are executed by a processor, all The processor executes the steps of the above-mentioned method for scrambling a data channel of a direct unicast communication of a terminal.

To sum up, in this application, the SL dedicated terminal identifier is allocated to the SL communication terminal, and the SL dedicated link identifier for the SL communication link is allocated to scramble the data channel, so as to support the purpose of unicast communication by the terminal. The node can find the SL dedicated link ID between the source node and the destination node according to the SL dedicated terminal ID of the source node, so as to perform data descrambling. This solution can increase the underlying communication security of terminal-to-terminal unicast communication.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (16)

1. A terminal-through unicast communication data channel scrambling system, characterized in that the system comprises: a first terminal and a second terminal; The first terminal obtains the SL dedicated terminal identifier of the direct communication of the terminal, the SL dedicated terminal identifier of the second terminal corresponding to the SL unicast communication, and the SL dedicated link identifier of the unicast communication between the terminal and the second terminal; The terminal sends the direct communication control indication SCI carried by the physical direct communication control channel PSCCH and the data carried by the physical direct communication data channel PSSCH; wherein, when sending the data, use the obtained SL dedicated link identifier for scramble; in The SL dedicated terminal identifiers of the terminal and the destination terminal are carried in the SCI; The second terminal obtains the SL dedicated terminal identification of the terminal and the SL dedicated link identification for unicast communication with the first terminal; when receiving the SCI sent by the first terminal, it determines itself as the purpose according to the SL dedicated terminal identification in the SCI The terminal, and the SL dedicated link identifier corresponding to the current SL unicast communication, and use the corresponding SL dedicated link identifier to descramble the received data. 2. The system according to claim 1, wherein the system further comprises: a base station; The base station obtains the SL dedicated terminal identifier of the first terminal and the second terminal, and sends it to the corresponding terminal through the radio resource control RRC or downlink control information DCI signaling; The first terminal receives the RRC signaling or DCI signaling sent by the base station and obtains and stores the SL dedicated terminal identifier carried in the signaling; The second terminal receives the RRC signaling or DCI signaling sent by the base station, obtains the SL dedicated terminal identifier carried in the signaling, and stores it; or, The first terminal obtains the locally configured SL dedicated terminal identifier of the terminal; The second terminal acquires the locally configured SL dedicated terminal identifier of the terminal. 3. The system according to claim 1, wherein the system further comprises: a base station; The first terminal sends the acquired SL dedicated terminal identification of the terminal to other terminals by broadcasting; when receiving the SL dedicated terminal identification broadcasted by other terminals, acquires the SL dedicated terminal identification of the corresponding terminal; The second terminal sends the acquired SL dedicated terminal identification of the terminal to other terminals by broadcasting; when receiving the SL dedicated terminal identification broadcasted by other terminals, acquires the SL dedicated terminal identification of the corresponding terminal; or, The first terminal broadcasts a request for the SL dedicated terminal identification of the surrounding terminals; when receiving the SL dedicated terminal identification responded by the second terminal, obtains the SL dedicated terminal identification of the second terminal; The second terminal, when receiving the SL dedicated terminal identification request sent by the first terminal, responds the SL dedicated terminal identification of the terminal to the first terminal; or, The first terminal sends a request to the base station to obtain the SL dedicated terminal identity of the second terminal; when receiving the SL dedicated terminal identity of the second terminal responded by the base station, obtains the SL dedicated terminal identity of the second terminal; The base station, when receiving the request for acquiring the SL-specific terminal identifier of the second terminal sent by the first terminal, responds to the SL-specific terminal identifier of the second terminal to the first terminal. 4. The system of claim 1, wherein: If the base station does not support the allocation of the SL dedicated link identifier or does not assign the SL dedicated link identifier through the base station, the SL dedicated link identifier uses part or all of the bits of the SL dedicated terminal identification of the first terminal, or the SL dedicated terminal identification of the second terminal. Part or all of the bits, or calculate the identities related to the SL dedicated terminal identity of the first terminal and the SL dedicated terminal identity of the second terminal according to the set rule, or the first terminal determines the SL dedicated link identity and notifies the SL of the second terminal. Dedicated link identification; If the base station supports the allocation of the SL dedicated link identifier, and the SL dedicated link identifier is allocated by the base station, the SL dedicated link identifier is obtained in the following manner: The first terminal requests the base station for the SL dedicated link ID corresponding to the SL dedicated terminal ID of the second terminal; when receiving the SL dedicated link ID responded by the base station through DCI signaling or RRC signaling, obtains the SL dedicated link ID corresponding to the destination terminal. link identification; The base station, when receiving the request from the terminal for the SL dedicated link identifier, responds to the first terminal through DCI signaling or RRC signaling with the SL dedicated link identifier corresponding to the requested second terminal, and sends the SL dedicated link identifier to the first terminal. The identification is sent to the second terminal; The second terminal, upon receiving the SL dedicated link identifier sent by the base station, obtains the SL dedicated link identifier corresponding to when the second terminal is used as the destination terminal of the first terminal. 5. The method of claim 1, wherein The first terminal sends a request for acquiring the SL dedicated terminal identifier of the second terminal and the corresponding SL dedicated link identifier to the base station; and receives the SL dedicated terminal identifier of the second terminal responded by the base station, and the corresponding SL dedicated link identifier When , obtain the SL dedicated terminal identifier of the second terminal, and the corresponding SL dedicated link identifier; The base station, when receiving the request for the SL dedicated terminal identification of the destination terminal and the corresponding SL dedicated link identification sent by the terminal, obtains the SL dedicated terminal identification of the destination terminal and the corresponding SL dedicated link identification and responds to the terminal; and sending the SL dedicated link identifier to the second terminal; The second terminal, upon receiving the SL dedicated link identifier sent by the base station, obtains the SL dedicated link identifier corresponding to when the second terminal is used as the destination terminal of the first terminal. 6. The system of claim 1, wherein: The first terminal, when determining that the SCI is a dedicated SCI, uses the acquired corresponding SL dedicated link identifier to scramble and then sends it to the second terminal; wherein, the resource location information occupied by the dedicated SCI is explicitly indicated in the public SCI Or implicitly indicated in a relatively fixed manner with the corresponding PSSCH position; The second terminal, when receiving the dedicated SCI sent by the first terminal, uses the obtained corresponding SL dedicated link identifier to perform descrambling. 7. The system according to any one of claims 1-6, characterized in that, The second terminal uses the corresponding SL dedicated link identifier for scrambling when sending the HARQ feedback of the hybrid automatic repeat request or the channel information measurement feedback to the first terminal; The first terminal, when receiving the HARQ feedback or the channel information measurement feedback sent by the second terminal, uses the corresponding SL dedicated link identifier for descrambling. 8. A method for scrambling a direct-to-terminal unicast communication data channel, characterized in that, applied to a terminal serving as a source node, the method comprising: Obtain the SL dedicated terminal identifier of the direct communication of the terminal, the SL dedicated terminal identifier of the destination terminal corresponding to the SL unicast communication, and the SL dedicated link identifier of the unicast communication between the terminal and the destination terminal; The direct communication control indication SCI carried by the channel PSCCH and the data carried by the physical direct communication data channel PSSCH; wherein, when sending data, use the obtained SL dedicated link identifier for scramble; carry the terminal in the SCI and the SL dedicated terminal identifier of the destination terminal, so that the destination terminal determines itself as the destination terminal, and uses the corresponding SL dedicated link identifier to descramble the received data. 9. The method of claim 8, wherein: Obtain the SL dedicated terminal identifier of the terminal configured locally; or, After receiving the radio resource control RRC signaling or downlink control information DCI signaling sent by the base station, the SL dedicated terminal identifier carried in the signaling is acquired and stored. 10. The method of claim 8, wherein: Send the acquired SL dedicated terminal identification of the terminal to other terminals by broadcasting; when receiving the SL dedicated terminal identification broadcasted by other terminals, obtain the SL dedicated terminal identification of the corresponding terminal; or, Broadcast the SL dedicated terminal identification request of the surrounding terminals; when receiving the SL dedicated terminal identification responded by the surrounding terminals, obtain the SL dedicated terminal identification of the corresponding terminal; or, A request for obtaining the SL dedicated terminal identity of the target terminal is sent to the base station; when receiving the SL dedicated terminal identity of the target terminal responded by the base station, the SL dedicated terminal identity of the target terminal is obtained. 11. The method of claim 8, wherein: Request the SL dedicated link ID corresponding to the SL dedicated terminal ID of the destination terminal from the base station; When receiving the SL dedicated link ID responded by the base station through DCI signaling or RRC signaling, obtain the SL dedicated link ID corresponding to the destination terminal. 12. The method of claim 8, wherein: If the base station does not support the allocation of the SL dedicated link identifier or does not assign the SL dedicated link identifier through the base station, the SL dedicated link identifier uses part or all of the bits of the SL dedicated terminal identification of the first terminal, or the SL dedicated terminal identification of the second terminal. Part or all of the bits, or calculate the identities related to the SL dedicated terminal identity of the first terminal and the SL dedicated terminal identity of the second terminal according to the set rule, or the first terminal determines the SL dedicated link identity and notifies the SL of the second terminal. Dedicated link identification; If the base station supports the allocation of the SL dedicated link identifier, and the SL dedicated link identifier is allocated by the base station, the SL dedicated link identifier is obtained in the following manner: Send a request for acquiring the SL dedicated terminal identifier of the destination terminal and the corresponding SL dedicated link identifier to the base station; When receiving the SL dedicated terminal identifier of the destination terminal and the corresponding SL dedicated link identifier that the base station responds to, the SL dedicated terminal identifier of the destination terminal and the corresponding SL dedicated link identifier are obtained. 13. The method of claim 8, wherein: When the SCI is a dedicated SCI, use the obtained corresponding SL dedicated link identifier to scramble and then send it; wherein, the resource location information occupied by the dedicated SCI is explicitly indicated in the public SCI or is relatively fixed with the corresponding PSSCH location. Way implicit instructions. 14. The method according to any one of claims 8-13, wherein the method further comprises: When receiving HARQ feedback or channel information measurement feedback sent by the destination terminal, use the corresponding SL dedicated link identifier for descrambling; wherein, the HARQ feedback or channel information measurement feedback is in the destination terminal Scrambling is performed using the corresponding SL dedicated link identifier obtained by the destination terminal. 15. An apparatus for scrambling a data channel of direct-to-terminal unicast communication, characterized in that the apparatus comprises a processor, and the processor is configured to execute the steps of the method according to claims 8-14. 16. A non-transitory computer-readable storage medium storing instructions, wherein the instructions, when executed by a processor, cause the processor to perform as in claims 8-14 the steps of the method.

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