CN111432348A - Scrambling method, device and system for terminal direct-connection unicast communication data channel - Google Patents
Scrambling method, device and system for terminal direct-connection unicast communication data channel Download PDFInfo
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- CN111432348A CN111432348A CN201910019319.1A CN201910019319A CN111432348A CN 111432348 A CN111432348 A CN 111432348A CN 201910019319 A CN201910019319 A CN 201910019319A CN 111432348 A CN111432348 A CN 111432348A
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Abstract
The application provides a scrambling method, a scrambling device and a scrambling system for a terminal direct-through unicast communication data channel, wherein the method comprises the steps of obtaining an S L special terminal identification of a terminal, an S L special terminal identification of a target terminal corresponding to S L unicast communication and an S L special link identification of the terminal and the target terminal in unicast communication, sending SCI borne by PSCCH and data borne by PSSCH to the target terminal, scrambling by using the obtained S L special link identification when sending data, carrying the S L special terminal identifications of the terminal and the target terminal in the SCI, enabling the target terminal to determine the terminal as the target terminal, and descrambling the received data by using the corresponding S L special link identification.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a scrambling method, a scrambling device and a scrambling system for a direct-connection unicast communication data channel of a terminal.
Background
Direct communication (S L) for terminal direct (D2D) communication includes a Physical direct communication control channel (PSCCH) and a Physical direct communication data channel (PSCCH), and carries a direct communication control indication (SCI) indicating detection of the PSCCH and data information, and corresponds to the Sidelink control channel and the data channel, respectively.
Four S L transmission Mode modes of Mode1, Mode2, Mode3 and Mode4 are supported in the existing standard L TE, wherein Mode1 and Mode2 are used for a non-V2X communication scene, a PSCCH of the PSCCH uses SCI format0, Mode3 and Mode4 are used for a V2X communication scene, the PSCCH uses SCI format 1.mode 1 and Mode3 to belong to a transmission Mode with base station coverage, and PSSCH resources are allocated based on base station scheduling, and Mode2 and Mode4 belong to a transmission Mode for distributed selection of PSSCH resources based on a pre-configured S L resource pool.
For the control channel PSCCH and the data channel PSCCH of S L, scrambling is initialized with different sequences.
Control channel PSCCH scrambling: scrambler sequence generator utilizing cinitInitializing 510;
data channel PSSCH scrambling: scrambler sequence generator utilization
And (3) initializing:
for Mode1 and Mode2, wherein
Indicating that the Mode1 and the Mode2 correspond to field Group Destination ID values contained in the control channel SCI format0 (allocating the lower 8 bits of Destination node Group ID (multicast one communication scenario) or Destination ID (unicast one to one communication scenario) for the corresponding system);
for Mode3 and Mode4, wherein
The parameters p and L correspond to the bit values and lengths associated with the CRC sequence of the control channel PSCCH indicating the PSCCH transmission.
As described above, for the 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 in the control channel, and this ID corresponds to a Destination ID in the unicast scenario and a Group ID in the multicast scenario. The ID information is related to the service type in R14 and may be assigned by the system or the terminal may be already set in the terminal device. And the receiving node detects the ID of the target node in the SCI, and if the 8 bits after judging the ID of the receiving node or the Group ID are the same as the ID in the SCI, the receiving node further descrambles the PSSCH of the data channel by adopting the ID. And the MAC headers of the PSSCH corresponding to the Mode1 and the Mode2 contain a source node ID and a destination node ID, and when the receiving node further judges that the destination node ID contained in the MAC header of the detected PSSCH is the same as the ID or the GroupID of the receiving node, the MAC packet is further transmitted to an upper layer for detection.
For Mode3 and Mode4, only broadcast scenes are supported, the scrambling of PSCCH and PSCCH sent by a source node is independent of the ID of a destination node, and surrounding nodes can detect control information and data information.
In addition to Mode3 and Mode4, in essence, Mode1 and Mode2 are also broadcast communication, and peripheral nodes can detect SCI information on the PSCCH, identify whether ID information in the SCI matches with themselves to judge whether to further detect the PSCCH, and identify whether a destination node ID in a MAC header of the PSCCH detection matches with themselves to judge whether to further submit to upper layer detection. However, the surrounding nodes already acquire the ID information for detecting the psch and the destination node ID information (mac header) decrypted by the PDCP layer, and can detect the psch and deliver the upper layer to decrypt the PDCP packet.
Disclosure of Invention
In view of this, the present application provides a method, an apparatus, and a system for scrambling a direct-to-unicast communication data channel of a terminal, which can increase the security of the bottom layer communication from the terminal to the terminal.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a system for scrambling a data channel for direct-to-unicast communication of a terminal, the system comprising: a first terminal and a second terminal;
the system comprises a first terminal, a second terminal, a PSCCH, a PSSCH, a first terminal, a second terminal and a third terminal, wherein the first terminal acquires an S L special terminal identification of the terminal, an S L special terminal identification of the second terminal corresponding to S L unicast communication and an S L special link identification of the terminal and the second terminal in unicast communication;
and when receiving the SCI sent by the first terminal, determining the second terminal as a target terminal according to the S L special terminal identifier in the SCI and the S L special link identifier corresponding to the current S L unicast communication, and descrambling the received data by using the corresponding S L special link identifier.
A scrambling method for a terminal direct-connection unicast communication data channel is applied to a terminal as a source node, and comprises the following steps:
the method comprises the steps of obtaining an S L special terminal identification of a terminal, an S L special terminal identification of a target terminal corresponding to S L unicast communication and an S L special link identification of the terminal and the target terminal in unicast communication, sending SCI carried by PSCCH and data carried by PSSCH to the target terminal, scrambling the data by using the obtained S L special link identification when the data are sent, carrying S L special terminal identifications of the terminal and the target terminal in the SCI, enabling the target terminal to determine the terminal as the target terminal, and descrambling the received data by using the corresponding S L special link identification.
A terminal through unicast communication data channel scrambling device comprises a processor, wherein the processor is used for executing the steps of the terminal through unicast communication data channel scrambling method.
A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of a terminal-through unicast communication data channel scrambling method.
According to the technical scheme, the S L special terminal identification is allocated to the S L communication terminal, and the S L special link identification for the S L communication link is allocated for scrambling a data channel, so that when the terminal conducts unicast communication, only the destination node can find the S L special link identification between the source node and the destination node according to the S L special terminal identification of the source node to conduct descrambling of data.
Drawings
Fig. 1 is a schematic diagram of a scrambling system for a direct-to-unicast communication data channel of a terminal in an embodiment of the present application;
fig. 2 is a schematic diagram of a scrambling procedure of a data channel for direct-to-unicast communication of a terminal in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides a scrambling system for a direct-connection unicast communication data channel of a terminal, which comprises: a plurality of terminals and base stations;
since the terminal direct unicast communication is provided in the embodiment of the present application, two terminals corresponding to one S L unicast communication, namely, the first terminal and the 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-through unicast communication in the embodiment of the present application, in fig. 1, a first terminal and a second terminal that need to perform S L unicast communication are taken as an example, where the first terminal serves as a source node, and the second terminal serves as a destination node.
First, the first terminal obtains an S L dedicated terminal identifier of the terminal, an S L dedicated terminal identifier of the second terminal corresponding to the S L unicast communication, and an S L dedicated link identifier of the terminal in unicast communication with the second terminal.
And the second terminal acquires the S L special terminal identification of the terminal and the S L special link identification in unicast communication with the first terminal.
The method for each terminal in the system to obtain its own S L dedicated terminal identifier may be obtained through base station allocation, or may be obtained by local configuration of the terminal, where the obtaining manner based on base station allocation is specifically as follows:
and the base station acquires the S L special terminal identifications of the first terminal and the second terminal and sends the identifications to the corresponding terminals through RRC or DCI signaling.
The base station acquires the first terminal and the S L dedicated terminal identifier of the second terminal in two ways:
firstly, configuring an S L special terminal identifier of each terminal on a base station, and acquiring the identifier from local configuration information;
second, ProSe UE ID allocated by upper layers, such as application layer, is used as S L specific terminal ID for the terminal, corresponding to SRC field in MAC S L-SCH header in L TE.
The base station acquires the ProSe UE ID allocated by the upper layer as the S L-specific terminal identity of the terminal.
When the base station sends the S L dedicated terminal identifier of the terminal to the terminal, the specific details may be as follows, through RRC signaling or DCI signaling:
through RRC signaling:
when the terminal requests the dedicated S L communication resource configuration from the base station, the base station transmits S L dedicated terminal identification including the terminal for S L data channel detection in the S L dedicated resource configuration to the terminal.
If the terminal sends SidelinkUEinformation to the base station through RRC signaling, the base station is informed of information such as a sending frequency band and a receiving frequency band used for S L communication, and an ID (identity) of a communication destination node of S L;
the identification part in S L-CommConfig in the RRC signaling sent by the base station to the terminal will include a new field for carrying the S L dedicated terminal identification for detecting the S L data channel, in addition to the S L-RNTI for detecting that the base station sends DCI indicating the S L PSCCH and PSCCH resources to the UE.
For the DCI signaling, the S L dedicated terminal identifier of each terminal may be notified through DCI after the terminal goes online, or the S L dedicated terminal identifier corresponding to the terminal may be notified through DCI after the terminal requests the dedicated S L communication resource configuration.
The first terminal receives and stores an S L special terminal identifier carried in an RRC signaling or a DCI signaling acquisition signaling sent by the base station;
and the second terminal receives and stores the S L special terminal identifier carried in the RRC signaling or the DCI signaling acquisition signaling sent by the base station.
There may be multiple methods for each terminal in the system to obtain the S L dedicated terminal identifier of the opposite terminal, taking the first terminal and the second terminal as an example, specifically:
the first method comprises the following steps:
the first terminal sends the acquired S L special terminal identification of the terminal to other terminals in a broadcast mode, and acquires the S L special terminal identification of the corresponding terminal when receiving the S L special terminal identification sent by other terminals in a broadcast mode.
And the second terminal sends the acquired S L special terminal identification of the terminal to other terminals in a broadcast mode, and acquires the S L special terminal identification of the corresponding terminal when receiving the S L special terminal identification sent by other terminals in a broadcast mode.
In this implementation manner, the attribute of the S L dedicated terminal identifier is open to the outside, that is, the terminal may notify the surrounding nodes of its own S L dedicated terminal identifier, and when receiving the S L dedicated terminal identifier broadcasted by the surrounding nodes, obtain the S L dedicated terminal identifier of the corresponding terminal.
A second type;
the method comprises the steps that a first terminal broadcasts an S L special terminal identification request for requesting surrounding terminals, and when an S L special terminal identification responded by a second terminal is received, an S L special terminal identification of the second terminal is obtained;
and the second terminal responds the S L dedicated terminal identifier of the second terminal to the first terminal when receiving the S L dedicated terminal identifier request sent by the first terminal.
In this method, when a first terminal serving as a source node needs to communicate with a second terminal serving as a destination node, the first terminal broadcasts and transmits an S L-specific terminal identification request to surrounding terminals to acquire an S L-specific terminal identification of the second terminal.
And the third is that:
when the base station receives the S L special terminal identification reported by each terminal, the base station respectively stores the S L special terminal identification corresponding to each terminal;
the first terminal sends a request for acquiring the S L special terminal identification of the second terminal to the base station, and acquires the S L special terminal identification of the second terminal when receiving the S L special terminal identification of the second terminal responded by the base station;
and the base station responds to the first terminal with the S L special terminal identification of the second terminal when receiving the request for acquiring the S L special terminal identification of the second terminal sent by the first terminal.
This is so that when a first terminal as a source node needs to communicate with a second terminal as a destination node, the first terminal sends an S L dedicated terminal identity request to the base station to obtain an S L dedicated terminal identity for the second terminal, similar to the Group ID known in L TE, which is related to the traffic type of the S L communication.
The method for acquiring the dedicated link identifier of S L may have the following two cases:
in the first case:
if the base station does not support the allocation of the S L dedicated link id or does not allocate the S L dedicated link id through the base station, the S L dedicated link id may use part or all bits of the S L dedicated terminal id of the first terminal, or part or all bits of the S L dedicated terminal id of the second terminal, or calculate ids related to the S L dedicated terminal id of the first terminal and the S L dedicated terminal id of the second terminal according to a set rule, or the S L dedicated link id that the first terminal determines the S L dedicated link id and notifies the second terminal;
the S L dedicated link identifier may adopt part or all bits of the dedicated terminal identifier of the first terminal S L, or part or all bits of the dedicated terminal identifier of the second terminal S L, or calculate identifiers related to the dedicated terminal identifier of the first terminal S L and the dedicated terminal identifier of the second terminal S L according to a set rule, and may pre-agree corresponding implementation manners at both ends of the first terminal and the second terminal, for example, a mutual notification manner may be used, or respective configuration manners may be used, so as to ensure that the S L dedicated link identifiers determined at both ends are the same, so as to achieve correct descrambling of data.
In the second case:
the base station supports allocating the S L dedicated link identifier, and allocates the S L dedicated link identifier through the base station, which includes the following two specific implementation manners:
first, the implementation mode is to obtain the dedicated terminal id of the destination node S L before obtaining the dedicated link id of S L.
The first terminal requests the base station for the S L dedicated link identification corresponding to the S L dedicated terminal identification of the second terminal, and acquires the S L dedicated link identification corresponding to the target terminal when receiving the S L dedicated link identification responded by the base station through DCI signaling or RRC signaling;
the base station responds to the request of the first terminal through DCI signaling or RRC signaling for the S L dedicated link identification corresponding to the second terminal when receiving the request of the terminal for requesting the S L dedicated link identification, and sends the S L dedicated link identification to the second terminal;
and the second terminal acquires the corresponding S L dedicated link identifier when the second terminal is used as the target terminal of the first terminal when receiving the S L dedicated link identifier sent by the base station.
In the embodiment of the present application, during implementation, an S L dedicated link identifier corresponding to one destination node may be requested each time, or S L dedicated link identifiers corresponding to multiple destination nodes may also be requested at the same time, and hereinafter, taking obtaining S L link identifiers corresponding to multiple destination nodes at the same time as an example, the DCI or RRC signaling includes an S L dedicated terminal identifier list of the destination node corresponding to S L communication, as follows:
SL Destination ID list＝{Node ID0，Node ID1，…,Node IDN}
the first method is as follows:
indicating by DCI:
a new DCI signaling may be designed by which to inform S L the relevant communication terminal (including the source node and the destination node) of the S L dedicated link identification used for the S L unicast communication.
TABLE 1
In table 1, field 1 and field 2 may be merged into one field when implemented specifically, for example, the merged field is designed to include N elements, each element includes M bits, where the first L bits represent S L dedicated terminal ids, and the last M-L bits represent corresponding S L dedicated link ids;
if the base station learns the S L Dedicated terminal identification list of the Destination Node corresponding to the S L communication by UCI or RRC signaling, field 2 may be omitted, and the nth S L Dedicated link identification Dedicated S L IDn in field 1 corresponds to the nth S L Dedicated terminal identification Node IDn in S L Destination ID list in UCI or RRC signaling sent by the terminal to the base station;
if no new DCI format is designed, the added fields in the communication-related DCI format of existing indication S L may be selected to include field 1 and field 2 in table 1, where field 2 may be omitted according to the above description.
When the source node and the destination node of S L receive the above-mentioned DCI signaling, they can know that they are in S L communication with the terminal corresponding to the S L dedicated terminal id indicated in the DCI, and then descramble the S L dedicated link id required for data channel pscch.
The second method comprises the following steps: indication by RRC signaling:
in the dedicated RRC signaling sent by the base station to the terminal, for example, the S L-CommConfig includes an S L dedicated link identifier list for performing S L communication with the terminal and an S L dedicated terminal identifier list of another node corresponding to S L, where the S L dedicated link identifier list is as follows:
Dedicated SL ID list＝{Dedicated SL ID0，Dedicated SL ID1，…，DedicatedSL IDN}；
the list of S L specific terminal ids of another node corresponding to S L is as follows:
SL Destination ID list＝{Node ID0，Node ID1，…,Node IDN}。
wherein the Dedicated S L IDn for the nth S L Dedicated link identification of the Dedicated S L ID list corresponds to the nth S L Dedicated terminal identification Node IDn in the S L Destination ID list.
The Dedicated S L ID list and the S L Destination ID list may be merged into a list, for example, the merged list is designed to include N elements, each element includes M bits, where the first L bits represent S L Dedicated terminal identifiers, and the last M-L bits represent corresponding S L Dedicated link identifiers;
if the base station knows the S L Dedicated terminal identifier list of the Destination Node corresponding to the S L communication by UCI or RRC signaling, S L Destination ID list may be omitted, and the n-th S L Dedicated link identifier Dedicated S L IDn of the Dedicated S L ID list corresponds to the n-th S L Dedicated terminal identifier Node IDn in the S L Destination ID list sent by the UE to the base station.
According to the above description, one S L unicast communication link corresponds to one S L Dedicated link ID, that is, assuming that two S L Dedicated terminal IDs related to S L unicast communication are NodeID1 and NodeID2, respectively, and its S L Dedicated link ID is Dedicated S L ID0, when NodeID1 transmits data to NodeID2, its PSSCH channel is scrambled based on the Dedicated S L ID0, and similarly, when NodeID2 transmits data to NodeID1, its PSSCH channel is scrambled based on the Dedicated S L ID 0.
According to the above description, when the base station sends the S L dedicated link identifier list and the S L dedicated terminal identifier list corresponding to S L unicast communication to the UE through DCI or RRC signaling, it is not necessary that both communication nodes (source node and destination node) related to S L notify the S L dedicated terminal list identifier of its destination node in advance through UCI or RRC signaling, and the S L dedicated terminal list identifier related to S L unicast communication of one node can be known through UCI or RRC signaling sent by other nodes, so that the base station can directly indicate the S L dedicated link identifier list and the S L dedicated terminal identifier list corresponding to S L unicast communication to the node through DCI or RRC signaling.
The second way is that when requesting the S L special terminal identification of the destination node from the base station, the corresponding S L special link identification is requested at the same time, taking the first terminal request as an example, the specific implementation process is as follows:
the first terminal sends a request for acquiring the S L special terminal identification of the second terminal and the corresponding S L special link identification to the base station, and acquires the S L special terminal identification of the second terminal and the corresponding S L special link identification when receiving the S L special terminal identification of the second terminal and the corresponding S L special link identification responded by the base station;
the base station acquires and responds to the S L special terminal identification of the target terminal and the corresponding S L special link identification to the terminal when receiving the request of the S L special terminal identification of the target terminal and the corresponding S L special link identification sent by the terminal;
and the second terminal acquires the corresponding S L dedicated link identifier when the second terminal is used as the target terminal of the first terminal when receiving the S L dedicated link identifier sent by the base station.
To this end, the S L dedicated terminal identity and the S L dedicated link identity are obtained.
And secondly, the first terminal sends SCI carried by PSCCH and data carried by PSSCH to the second terminal, wherein, when sending data, the obtained S L special link mark is used for scrambling, and the SCI carries S L special terminal marks of the terminal and the target terminal.
The first terminal scrambles by using the acquired corresponding S L dedicated link identifier and then sends the scrambled information to the second terminal when the SCI is determined to be the dedicated SCI, wherein the resource position information occupied by the dedicated SCI is indicated in the public SCI or indicated in the PSCCH;
and the second terminal descrambles the received special SCI sent by the first terminal by using the obtained corresponding S L special link identification.
Thirdly, when the second terminal receives the SCI sent by the first terminal, the second terminal determines that the second terminal is a destination terminal according to the S L dedicated terminal identifier in the SCI and the S L dedicated link identifier corresponding to the current S L unicast communication, and descrambles the received data by using the corresponding S L dedicated link identifier.
The source node (first terminal) of the S L unicast communication sends SCI to the destination node (second terminal), wherein the SCI includes the S L dedicated terminal identifications of the source node and the destination node, or can be uniquely mapped to the identification information of the S L dedicated terminal identification, so that the destination node can know whether the destination node is the corresponding destination node or not by detecting the SCI information, and can descramble according to the corresponding S L dedicated link identification, wherein the SCI can be unscrambled or adopt the scrambling mode in PSCCH in L TE, so as to support the surrounding nodes to detect the SCI information.
Data sent by a source node UE of S L unicast communication to a destination node is carried by a data channel PSSCH, and an initialization value of a PSSCH scrambler sequence generator is related to an S L dedicated link identifier.
The destination node (second terminal) of the S L unicast communication performs descrambling detection on the psch according to the S L dedicated link identification.
The embodiment of the present application may further extend that the terminal is supported to divide the SCI into a common SCI and a dedicated SCI part when performing S L unicast communication, where the dedicated SCI and the data channel are both scrambled by S L dedicated link identifier.
For the common SCI, information that can be informed to any surrounding node can be included, including S L dedicated terminal id indicating the corresponding dedicated SCI and data channel resource location information, source node and destination node, when the surrounding node detects the common SCI, it can learn its dedicated SCI and data channel resource location information, so as to provide reference for resource selection for subsequent own S L communication, and determine whether further detection of dedicated SCI is required according to the S L dedicated terminal id of the destination node.
The dedicated SCI may include information such as MCS, Hybrid Automatic Repeat reQuest (HARQ) and the like required to support the surrounding nodes to further detect data. The resource location information of the dedicated SCI information can be indicated in the common SCI with a field or incorporated into the psch with its resource location in the psch set by the system.
The destination node (second terminal) corresponds to the S L private link ID according to the S L private terminal ID of the source node and the destination node in the public SCI, and performs scrambling detection on the private SCI and the data channel according to the S L private link ID.
The method further comprises the following steps:
the second terminal uses the corresponding S L special link mark to scramble when sending HARQ feedback or channel information measurement feedback to the first terminal;
and the first terminal descrambles by using the corresponding S L dedicated link identifier when receiving the HARQ feedback or the channel information measurement feedback sent by the second terminal.
That is, the first terminal sends information to the second terminal, the second terminal and the first terminal both scramble and descramble using the same S L dedicated link ID assigned by the base station, and the base station assigns a globally unique link ID for each S L dedicated link.
Based on the same inventive concept, the embodiment of the application also provides a scrambling method for the direct-connection and unicast communication data channel of the terminal, which is applied to the terminal serving as the source node. Referring to fig. 2, fig. 2 is a schematic diagram of a scrambling procedure of a data channel for direct-to-unicast communication of a terminal in the embodiment of the present application. The method comprises the following specific steps:
in step 201, the terminal as the source node obtains the S L dedicated terminal id of the terminal, the S L dedicated terminal id of the destination terminal corresponding to the S L unicast communication, and the S L dedicated link id of the terminal in unicast communication with the destination terminal.
The method for the terminal to obtain the S L dedicated terminal identifier of the terminal includes:
acquiring a locally configured S L special terminal identifier of the terminal;
or the like, or, alternatively,
and receiving and storing the S L special terminal identification carried in the RRC signaling or the DCI signaling acquisition signaling sent by the base station.
The method for the terminal as the source node to obtain the S L dedicated terminal identifier of the destination terminal is as follows:
the obtained S L special terminal identification of the terminal is sent to other terminals in a broadcasting way, and when the S L special terminal identification sent by other terminals in a broadcasting way is received, the S L special terminal identification of the corresponding terminal is obtained;
or the like, or, alternatively,
the method comprises the steps of broadcasting an S L special terminal identification request of a peripheral terminal, and acquiring an S L special terminal identification of a corresponding terminal when receiving an S L special terminal identification responded by the peripheral terminal;
or the like, or, alternatively,
and when receiving the S L special terminal identification of the target terminal responded by the base station, acquiring the S L special terminal identification of the target terminal.
The method for the terminal as the source node to obtain the corresponding S L dedicated link identifier includes:
if the base station does not support the allocation of the S L dedicated link identifier or does not allocate the S L dedicated link identifier through the base station, the S L dedicated link identifier adopts part or all bits of the S L dedicated terminal identifier of the first terminal, or part or all bits of the S L dedicated terminal identifier of the second terminal, or calculates identifiers related to the S L dedicated terminal identifier of the first terminal and the S L dedicated terminal identifier of the second terminal according to a set rule, or the first terminal determines the S L dedicated link identifier and informs the S L dedicated link identifier of the second terminal;
if the base station supports allocating the S L dedicated link identifier and allocates the S L dedicated link identifier through the base station, the S L link dedicated identifier is obtained as follows:
requesting S L private link identification corresponding to the S L private terminal identification of the destination terminal from the base station;
and when receiving the S L dedicated link identifier responded by the base station through the DCI signaling or the RRC signaling, acquiring the S L dedicated link identifier corresponding to the target terminal.
The method for the terminal as the source node to obtain the S L dedicated terminal identifier of the destination terminal and the corresponding S L dedicated link identifier is as follows:
sending a request for acquiring the S L dedicated terminal identifier of the destination terminal and the corresponding S L dedicated link identifier to the base station;
and when the S L dedicated terminal identification of the destination terminal responded by the base station and the corresponding S L dedicated link identification are received, acquiring the S L dedicated terminal identification of the destination terminal and the corresponding S L dedicated link identification.
And 202, the terminal sends SCI carried by PSCCH and data carried by PSSCH to the destination terminal, wherein, when sending data, the terminal uses the obtained S L special link mark to carry scrambling, the SCI carries the S L special terminal marks of the terminal and the destination terminal, the destination terminal determines itself as the destination terminal, and uses the corresponding S L special link mark to descramble the received data.
And when the SCI is the special SCI, scrambling and then transmitting the special link identification of the acquired corresponding S L, wherein the resource position information occupied by the special SCI is indicated in the public SCI or indicated in the PSCCH.
The method further comprises the following steps:
and when receiving the HARQ feedback or the channel information measurement feedback sent by the target terminal, descrambling by using the corresponding S L dedicated link identifier, wherein the HARQ feedback or the channel information measurement feedback is scrambled by using the corresponding S L dedicated link identifier acquired by the target terminal at the target terminal.
Based on the same inventive concept, the embodiment of the present application further provides a device for scrambling a data channel of terminal-through unicast communication, where the device includes a processor, and the processor is configured to execute the steps of the method for scrambling a data channel of terminal-through unicast communication.
Based on the same inventive concept, a non-transitory computer readable storage medium is also provided in the embodiments of the present application, and stores instructions, wherein the instructions, when executed by a processor, cause the processor to perform the steps of the above-mentioned terminal-through unicast communication data channel scrambling method.
In summary, the application supports that only the destination node can find the S L dedicated link identifier between the source node and the destination node according to the S L dedicated terminal identifier of the source node when the terminal performs the unicast communication by allocating the S L dedicated terminal identifier to the S L communication terminal and allocating the S L dedicated link identifier for the S L communication link for scrambling the data channel.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (16)
1. A system for scrambling data channels for direct-to-unicast communication of a terminal, the system comprising: a first terminal and a second terminal;
the method comprises the steps that a first terminal acquires a direct communication S L special terminal identification of the terminal, an S L special terminal identification of a second terminal corresponding to S L unicast communication and an S L special link identification of the terminal and the second terminal in unicast communication, sends a direct communication control indication SCI borne by a physical direct communication control channel PSCCH and data borne by a physical direct communication data channel PSSCH to the second terminal, wherein the obtained S L special link identification is used for scrambling when sending the data;
and when receiving the SCI sent by the first terminal, determining the second terminal as a target terminal according to the S L special terminal identifier in the SCI and the S L special link identifier corresponding to the current S L unicast communication, and descrambling the received data by using the corresponding S L special link identifier.
2. The system of claim 1, further comprising: a base station;
the base station acquires the S L special terminal identifications of the first terminal and the second terminal, and sends the identifications to the corresponding terminals through Radio Resource Control (RRC) or Downlink Control Information (DCI) signaling;
the first terminal receives and stores an S L special terminal identifier carried in an RRC signaling or a DCI signaling acquisition signaling sent by the base station;
the second terminal receives and stores the RRC signaling or the DCI signaling sent by the base station to obtain the S L special terminal identification carried in the signaling;
or the like, or, alternatively,
the first terminal acquires a locally configured S L special terminal identifier of the terminal;
the second terminal acquires the locally configured S L-specific terminal identifier of the terminal itself.
3. The system of claim 1, further comprising: a base station;
the first terminal sends the acquired S L special terminal identification of the terminal to other terminals in a broadcast mode, and acquires the S L special terminal identification of the corresponding terminal when receiving the S L special terminal identification sent by other terminals in a broadcast mode;
the second terminal sends the acquired S L special terminal identification of the terminal to other terminals in a broadcast mode, and acquires the S L special terminal identification of the corresponding terminal when receiving the S L special terminal identification sent by other terminals in a broadcast mode;
or the like, or, alternatively,
the first terminal broadcasts an S L special terminal identification request requesting peripheral terminals, and acquires an S L special terminal identification of the second terminal when receiving an S L special terminal identification responded by the second terminal;
the second terminal responds the S L special terminal identification of the terminal to the first terminal when receiving the S L special terminal identification request sent by the first terminal;
or the like, or, alternatively,
the first terminal sends a request for acquiring the S L special terminal identification of the second terminal to the base station, and acquires the S L special terminal identification of the second terminal when receiving the S L special terminal identification of the second terminal responded by the base station;
and the base station responds to the first terminal with the S L special terminal identification of the second terminal when receiving the request for acquiring the S L special terminal identification of the second terminal sent by the first terminal.
4. The system of claim 1,
if the base station does not support the allocation of the S L dedicated link identifier or does not allocate the S L dedicated link identifier through the base station, the S L dedicated link identifier adopts part or all bits of the S L dedicated terminal identifier of the first terminal, or part or all bits of the S L dedicated terminal identifier of the second terminal, or calculates identifiers related to the S L dedicated terminal identifier of the first terminal and the S L dedicated terminal identifier of the second terminal according to a set rule, or the first terminal determines the S L dedicated link identifier and informs the S L dedicated link identifier of the second terminal;
if the base station supports allocating the S L dedicated link identifier and allocates the S L dedicated link identifier through the base station, the S L link dedicated identifier is obtained as follows:
the first terminal requests the base station for the S L dedicated link identification corresponding to the S L dedicated terminal identification of the second terminal, and acquires the S L dedicated link identification corresponding to the target terminal when receiving the S L dedicated link identification responded by the base station through DCI signaling or RRC signaling;
the base station responds to the request of the first terminal through DCI signaling or RRC signaling for the S L dedicated link identification corresponding to the second terminal when receiving the request of the terminal for requesting the S L dedicated link identification, and sends the S L dedicated link identification to the second terminal;
and the second terminal acquires the corresponding S L dedicated link identifier when the second terminal is used as the target terminal of the first terminal when receiving the S L dedicated link identifier sent by the base station.
5. The method of claim 1,
the first terminal sends a request for acquiring the S L special terminal identification of the second terminal and the corresponding S L special link identification to the base station, and acquires the S L special terminal identification of the second terminal and the corresponding S L special link identification when receiving the S L special terminal identification of the second terminal and the corresponding S L special link identification responded by the base station;
the base station acquires and responds to the S L special terminal identification of the target terminal and the corresponding S L special link identification to the terminal when receiving the request of the S L special terminal identification of the target terminal and the corresponding S L special link identification sent by the terminal;
and the second terminal acquires the corresponding S L dedicated link identifier when the second terminal is used as the target terminal of the first terminal when receiving the S L dedicated link identifier sent by the base station.
6. The system of claim 1,
the first terminal scrambles by using the acquired corresponding S L private link identifier and then sends the scrambled information to the second terminal when the SCI is determined to be the private SCI, wherein the resource position information occupied by the private SCI is explicitly indicated in the public SCI or implicitly indicated in a mode of relatively fixing the position of the corresponding PSSCH;
and the second terminal descrambles the received special SCI sent by the first terminal by using the obtained corresponding S L special link identification.
7. The system according to any one of claims 1 to 6,
the second terminal uses the corresponding S L special link mark to scramble when sending the HARQ feedback or the channel information measurement feedback to the first terminal;
and the first terminal descrambles by using the corresponding S L dedicated link identifier when receiving the HARQ feedback or the channel information measurement feedback sent by the second terminal.
8. A scrambling method for a direct-connection and unicast communication data channel of a terminal is applied to the terminal as a source node, and the method comprises the following steps:
the method comprises the steps of obtaining a through communication S L special terminal identification of a terminal, an S L special terminal identification of a target terminal corresponding to S L unicast communication and an S L special link identification of the terminal and the target terminal in unicast communication, sending a through communication control indication SCI carried by a physical through communication control channel PSCCH and data carried by a physical through communication data channel PSSCH to the target terminal, scrambling the data by using the obtained S L special link identification when the data are sent, and carrying the S L special terminal identifications of the terminal and the target terminal in the SCI so that the target terminal can determine the terminal as the target terminal and descramble the data received by using the corresponding S L special link identification.
9. The method of claim 8,
acquiring a locally configured S L special terminal identifier of the terminal;
or the like, or, alternatively,
and receiving and storing the S L special terminal identifier carried in the radio resource control RRC signaling or downlink control information DCI signaling acquisition signaling sent by the base station.
10. The method of claim 8,
the obtained S L special terminal identification of the terminal is sent to other terminals in a broadcasting way, and when the S L special terminal identification sent by other terminals in a broadcasting way is received, the S L special terminal identification of the corresponding terminal is obtained;
or the like, or, alternatively,
the method comprises the steps of broadcasting an S L special terminal identification request of a peripheral terminal, and acquiring an S L special terminal identification of a corresponding terminal when receiving an S L special terminal identification responded by the peripheral terminal;
or the like, or, alternatively,
and when receiving the S L special terminal identification of the target terminal responded by the base station, acquiring the S L special terminal identification of the target terminal.
11. The method of claim 8,
requesting S L private link identification corresponding to the S L private terminal identification of the destination terminal from the base station;
and when receiving the S L dedicated link identifier responded by the base station through the DCI signaling or the RRC signaling, acquiring the S L dedicated link identifier corresponding to the target terminal.
12. The method of claim 8,
if the base station does not support the allocation of the S L dedicated link identifier or does not allocate the S L dedicated link identifier through the base station, the S L dedicated link identifier adopts part or all bits of the S L dedicated terminal identifier of the first terminal, or part or all bits of the S L dedicated terminal identifier of the second terminal, or calculates identifiers related to the S L dedicated terminal identifier of the first terminal and the S L dedicated terminal identifier of the second terminal according to a set rule, or the first terminal determines the S L dedicated link identifier and informs the S L dedicated link identifier of the second terminal;
if the base station supports allocating the S L dedicated link identifier and allocates the S L dedicated link identifier through the base station, the S L link dedicated identifier is obtained as follows:
sending a request for acquiring the S L dedicated terminal identifier of the destination terminal and the corresponding S L dedicated link identifier to the base station;
and when the S L dedicated terminal identification of the destination terminal responded by the base station and the corresponding S L dedicated link identification are received, acquiring the S L dedicated terminal identification of the destination terminal and the corresponding S L dedicated link identification.
13. The method of claim 8,
and when the SCI is the special SCI, scrambling and then sending the special link identification by using the acquired corresponding S L, wherein the resource position information occupied by the special SCI is explicitly indicated in the public SCI or implicitly indicated by a mode of relatively fixing the position of the corresponding PSSCH.
14. The method according to any one of claims 8-13, wherein the method further comprises:
and when receiving hybrid automatic repeat request (HARQ) feedback or channel information measurement feedback sent by the target terminal, descrambling the HARQ feedback or the channel information measurement feedback by using the corresponding S L dedicated link identifier, wherein the HARQ feedback or the channel information measurement feedback is scrambled by using the corresponding S L dedicated link identifier acquired by the target terminal at the target terminal.
15. An apparatus for scrambling a data channel for a terminal-through unicast communication, characterized in that the apparatus comprises a processor configured to perform the steps of the method according to claims 8 to 14.
16. A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of the method as recited in claims 8-14.
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