TW202008836A - Random access method and communication device - Google Patents

Abstract

Provided are a random access method and a communication device. The method is adopted to effectively schedule a transmission of a second message during a 2-step random access procedure. The method comprises: generating, according to a first index, a random-access radio network temporary identifier (RA-RNTI), the first index comprising a RAPID index and/or a SSB index of a terminal device; and using the RA-RNTI to perform first processing on a downlink control channel, wherein the downlink control channel is used to schedule a second message during a 2-step random access procedure and the first processing comprises scrambling or descrambling the downlink control channel.

Description

Random access method and communication equipment

The embodiments of the present application relate to the communication field, and in particular to a random access method and communication equipment.

In a 5G system, or a new radio (New Radio, NR) system, when a terminal device performs random access (Random Access, RA), it can adopt a 2-step RA method. For example, the message (Message, abbreviated as "Msg") 1 in the 4-step RA process (ie, "Msg") 1 is the preamble and Msg 3 are sent as the first message; the 4-step RA is stored randomly The Msg 2 and Msg 4 in the fetching process are sent as the second message.

In the 4-step random access process, Msg 2 includes multiple users’ random access response (Random Access Response, RAR) messages, while in the 2-step random access process, Msg 2 can include only one user’s RAR message. For this purpose, the terminal device needs to be able to recognize its own RAR message. Therefore, in the 2-step random access process, how to schedule the transmission of the second message between the network device and the terminal device becomes an urgent problem to be solved.

The embodiments of the present application provide a random access method and a communication device, which can effectively schedule the transmission of the second message in a 2-step random access process.

In a first aspect, a random access method is provided, including: generating a random access wireless network temporary identifier RA-RNTI according to a first index, the first index including a random access preamble index RAPID of a terminal device and /Or synchronization signal block SSB index; using the RA-RNTI to perform the first processing on the downlink control channel, wherein the downlink control channel is used to schedule the second message in the 2-step random access process, the first One process includes scrambling or descrambling the downlink control channel.

In a second aspect, a communication device is provided, which can execute the method in the first aspect or any optional implementation manner of the first aspect. Specifically, the communication device may include a functional module for performing the method in the first aspect or any possible implementation manner of the first aspect.

In a third aspect, a communication device is provided, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or any possible implementation manner of the first aspect.

According to a fourth aspect, a wafer is provided for implementing the above-mentioned first aspect or the method in any possible implementation manner of the first aspect. Specifically, the chip includes a processor for calling and running a computer program from the memory, so that the device installed with the chip executes the method in the first aspect or any possible implementation manner of the first aspect.

According to a fifth aspect, a computer-readable storage medium is provided for storing a computer program, which causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.

According to a sixth aspect, a computer program product is provided, including computer program instructions, which cause the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.

In a seventh aspect, a computer program is provided, which when run on a computer, causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.

According to an eighth aspect, a terminal device is provided, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or any possible implementation manner of the first aspect.

In a ninth aspect, a network device is provided, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or any possible implementation manner of the first aspect.

Through the above technical solutions, network equipment and terminal equipment can generate RA-RNT based on RAPID or SSB index, and use this RA-RNT to scramble the downlink control channel used to schedule the second message in the 2-step random access process Or descramble. For different terminal devices, the selected RAPID and corresponding SSB index may be different, so for terminal devices that use different preambles for random access, the generated RA-RNTI for scrambling or descrambling the downlink control channel is also It can be different, so that the second message returned by the network device to different terminal devices can be identified, and the effective transmission of the second message in the 2-step random access process is realized.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, and Broadband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, advanced long term evolution (LTE-A) system, new radio (NR) system, NR system evolution system, unlicensed spectrum LTE-based access to unlicensed spectrum (LTE-U) system, NR-based access to unlicensed spectrum (NR-U) system, Universal Mobile Telecommunication System (UMTS) , Worldwide Interoperability for Microwave Access (WiMAX) communication system, wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity (Wireless Fidelity, WiFi), next-generation communication system or other communication systems, etc.

Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technologies, mobile communication systems will not only support traditional communication, but also support, for example, device to device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), and Vehicle to Vehicle (V2V) communication, etc. The embodiments of the present application can also be applied to these communications system.

Optionally, the communication system in the embodiments of the present application may be applied to a carrier aggregation (CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or a standalone (SA) configuration. Web scene.

Exemplarily, the communication system 100 applied in the embodiment of the present application is shown in FIG. 1. The wireless communication system 100 may include network equipment 110. The network device 110 may be a device that communicates with a terminal device. The network device 110 can provide communication coverage for a specific geographic area, and can communicate with terminal devices located in the coverage area. Optionally, the network device 100 may be a base transceiver station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a Node B (NodeB, NB) in a WCDMA system, or an LTE system Evolutionary Node B (eNB or eNodeB), or a network-side device in the NR system, or a wireless controller in the Cloud Radio Access Network (CRAN), or the network Road equipment can be relay stations, access points, in-vehicle equipment, wearable devices, network-side equipment in next-generation networks, or network equipment in future public land mobile networks (PLMN), etc. .

The wireless communication system 100 further includes at least one terminal device 120 located within the coverage of the network device 110. As used herein, "terminal equipment" includes, but is not limited to, connection via wireline, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct Cable connection; and/or another data connection/network; and/or via a wireless interface, such as for mobile networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks Road, satellite network, AM-FM broadcast transmitter; and/or another terminal device set to receive/transmit communication signals; and/or Internet of Things (IoT) equipment. Terminal devices configured to communicate through a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", or "mobile terminals".

The terminal device 120 may be mobile or fixed. Alternatively, the terminal device 120 may refer to an access terminal, user equipment (User Equipment, UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user Terminals, terminals, wireless communication equipment, user agents or user devices. The access terminal may be a mobile phone, a wireless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), or a wireless communication function Handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or terminal devices in future evolved PLMNs, etc. Among them, optionally, terminal direct connection (Device to Device, D2D) communication may also be performed between the terminal devices 120.

Specifically, the network device 110 can provide services to the community, and the terminal device 120 communicates with the network device 110 through transmission resources (for example, frequency domain resources, or spectrum resources) used by the community, and the community can be a network The community corresponding to the device 110 (for example, a base station). The community may belong to a macro base station or a base station corresponding to a small community (Small cell). The small community here may include: an urban community (Metro cell) and a micro cell (Micro cell), Pico cell, Femto cell, etc. These small communities have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

FIG. 1 exemplarily shows one network device and two terminal devices. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminals within the coverage area. The device is not limited in this embodiment of the present application.

Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobile management entity, which are not limited in the embodiments of the present application.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be called communication devices. Taking the communication system 100 shown in FIG. 1 as an example, the communication device may include a network device 110 and a terminal device 120 with a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above, which is not described here. It will be described again; the communication device may also include other devices in the communication system 100, such as network controllers, mobile management entities and other network entities, which are not limited in the embodiments of the present application.

After the community search process, the terminal device has achieved downlink synchronization with the community, so the terminal device can receive downlink data. However, the terminal device can only perform uplink transmission if it is synchronized with the community. The terminal device can establish a connection with the community and obtain uplink synchronization through a random access procedure (Random Access Procedure, RAR). That is to say, through random access, the terminal device can obtain uplink synchronization, and obtain the unique identifier assigned by the network device, that is, the Community Radio Network Temporary Identity (C-RNTI). Therefore, random access can be used not only in initial access, but also in the case where the user's uplink synchronization is lost. For ease of understanding, the random access process will be briefly described below in conjunction with FIGS. 2 and 3.

The random access process can usually be triggered by one of the following 6 types of trigger events:

(1) Initial access.

The terminal device will enter the RRC connected state (RRC_CONNECTED) from the Radio Resource Control (RRC) idle state (RRC_IDLE state).

(2) Handover.

When the terminal device needs to establish uplink synchronization with the new community, it is necessary to initiate random access in the new community.

(3) RRC Connection Re-establishment.

The terminal equipment re-establishes a wireless connection after a radio link failure (Radio Link Failure, RLF).

(4) In the RRC connection state, when the downlink data arrives, the uplink is in the "out of sync" state.

At this time, after the downlink data arrives, the terminal device needs to reply (Acknowledgement, ACK) or negative acknowledgement (Negative Acknowledgement, NACK).

(5) In the RRC connected state, when the uplink data arrives, the uplink is in the "out-of-sync" state or no available physical upload control channel (PUCCH) resource is used for scheduling request (SR) transmission.

When the uplink data arrives, for example, when it is necessary to report a measurement report or send data, if the uplink is in the "out-of-sync" state, the terminal device can initiate a random access process; or, if the terminal device that is already in the uplink-synchronous state is allowed to use the random access channel ( Random Access Channel (RACH) to replace the role of SR, then when the uplink is in the "out of sync" state, the terminal device can initiate a random access process.

(6) Timing Advance (TA) is required for positioning in the RRC connected state.

In addition, random access may be triggered due to the RRC_INACTIVE transition, requesting other system information (OSI), or beam failure recovery.

Fig. 2 is a flow interaction diagram of 4-step random access. As shown in Figure 2, the 4-step random access process can include the following four steps:

Step 1, Msg 1.

The terminal device sends Msg 1 to the base station to tell the network device that the terminal device initiated a random access request. The Msg 1 carries a random access preamble (Random Access Preamble, RAP), or random access preamble sequence. , Preamble, preamble, etc. At the same time, Msg 1 can also be used for network equipment to estimate the transmission delay between it and the terminal equipment and to calibrate the uplink time.

Step 2. Msg 2.

After receiving the Msg 1 sent by the terminal device, the network device sends Msg 2 to the terminal device, which is a Random Access Response (Random Access Response, RAR) message. The Msg 2 can be scrambled by Random Access Radio Network Temporary Identity (RA-RNTI). The Msg 2 may carry, for example, a Time Advance (TA) message, an uplink authorization command such as the configuration of uplink resources, and a temporary community radio network temporary identity (Temporary Cell-Radio Network Temporary Identity, TC-RNTI).

The terminal device monitors the Physical Downlink Control Channel (PDCCH) in the random access response time window (RAR window) to receive the RAR message returned by the network device. The RAR message can be descrambled using the corresponding RA-RNTI.

If the terminal device does not receive the RAR message returned by the network device within the RAR time window, the random access process is considered to have failed this time.

If the terminal device successfully receives a RAR message, and the preamble index carried in the RAR message is the same as the index of the preamble sent by the terminal device through Msg 1, it is considered that the RAR has been successfully received, and the terminal The device can stop monitoring in the RAR time window.

Among them, Msg 2 may include RAR messages for multiple terminal devices, and the RAR message of each terminal device may include the random access preamble identifier (RAP Identify, RAPID) (or random storage) used by the terminal device. Take the preamble index), messages used to transmit Msg 3 resources, TA adjustment messages, TC-RNTI, etc. In the NR standard, RAR messages can be scheduled using a Download Control Information (DCI) format (DCI format) 1-0, and the PDCCH scheduling the RAR messages can be scrambled using the above-mentioned RA-RNTI.

Step 3, Msg 3.

After receiving the RAR message, the terminal device determines whether the RAR is its own RAR message. For example, the terminal device can use the preamble identifier to check. After determining that it is its own RAR message, it generates Msg 3 at the RRC layer and sends The network device sends Msg 3. Which needs to carry the identification information of the terminal equipment, etc.

Specifically, for different random access trigger events, the Msg 3 in step 3 of the 4-step random access process may include different content to perform scheduled transmission (Scheduled Transmission).

For example, for the initial access scenario, Msg 3 includes the RRC Connection Request (RRC Connection Request) generated by the RRC layer, which carries at least the Non-Access Stratum (NAS) identification information of the terminal device, and may also carry, for example, Serving-Temporary Mobile Subscriber Identity (S-TMSI) or random number of the terminal equipment; for connection reestablishment scenarios, Msg 3 includes RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) generated by the RRC layer , And does not carry any NAS messages, in addition can also carry, for example, community radio network temporary identifier (Cell Radio Network Temporary Identifier, C-RNTI) and protocol control information (Protocol Control Information, PCI), etc.; for switching scenarios, Msg 3 includes The RRC handover confirmation message (RRC Handover Confirm) generated by the RRC layer and the C-RNTI of the terminal device can also carry, for example, Buffer Status Report (BSR); for other trigger events such as the arrival of uplink/downlink data, Msg 3 At least the C-RNTI of the terminal equipment needs to be included.

It should be noted that uplink transmission usually uses terminal device specific information, such as C-RNTI to scramble the data carried in the uplink shared channel (UL-SCH). But at this time the conflict has not been resolved, so when scrambling Msg 3, it cannot be based on C-RNTI, but can only use TC-RNTI.

Step 4, Msg 4.

The network device sends Msg 4 to the terminal device, and the terminal device correctly receives Msg 4 to complete the contention resolution (Contention Resolution). For example, during the RRC connection establishment process, Msg 4 may carry the RRC connection establishment message.

Since the terminal device in step 3 will carry its own unique identifier in Msg 3, such as C-RNTI or the identification message from the core network (such as S-TMSI or a random number), the network device is in the competition resolution mechanism, The unique identifier of the terminal device will be carried in Msg 4 to designate the terminal device that has won the competition. Other terminal devices that do not win the competition will re-initiate random access. The PDCCH of Msg 4 can be scrambled using TC-RNTI.

In the 5G system, when the terminal device performs random access, in addition to the above four-step random access method for random access, a two-step random access method can also be used. One possible method is to send the messages Msg 1, and Msg 3 in the 4-step random access process as the first message; and Msg 2, and Msg 4 in the 4-step random access process as the second message. To send.

As shown in FIG. 3, the 2-step random access process may include the following two steps:

Step 1: The terminal equipment sends the first message to the base station.

The first message may include a preamble and an uplink channel, and the uplink channel may be a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH). Wherein, the upstream channel may carry the identification information of the terminal device and the reason of the RRC request, for example. This first message is similar to some or all of the messages carried in Msg 1 and Msg 3 during the 4-step random access process.

Step 2: If the network device successfully receives the first message sent by the terminal device, it sends a second message to the terminal device.

The second message may include, for example, a RAR message, a conflict resolution message (including the unique identifier of the terminal device generated in the competition), a C-RNTI allocation message, etc. The RAR message may include a TA adjustment message and a backoff (Backoff, BI) messages etc. This second message is similar to some or all of the messages carried in Msg 2 and Msg 4 during the 4-step random access process.

It should be understood that FIG. 2 or FIG. 3 is merely an example. Since the two-step random access process has not yet entered the standardization stage, here we only use Figure 3 as an example to introduce, there are other possibilities for the definition of each random access message involved, and does not limit the two-step random access Other definitions of each random access message in the process. The method described in the embodiments of the present application is applicable to all other 2-step random access processes.

In the 4-step random access process, Msg 2 may include different RAR messages for multiple terminal devices. In the 2-step random access process, the second message can carry a RAR message for a terminal device, and can also carry a conflict resolution message for the terminal device (that is, the message related to the identification of the terminal device in the first message ), C-RNTI allocation information, etc. It may also carry, for example, RRC connection establishment messages.

Each community can have 64 available preambles, and each terminal device can select one of them for random access, and send the selected preamble through a physical random access channel (Physical Random Access Response Channel, PRACH). In the 4-step random access process, Msg 2 may carry RAR messages of multiple terminal devices at most. In the 2-step random access process, because the second message includes all or part of the Msg 2 and Msg 4 messages in the 4-step random access process, and because the Msg 4 may also carry, for example, an RRC connection establishment message Messages with very high equivalence overhead. If the above message for multiple terminal devices is still carried in the second message, then in order to cover these terminal devices in the community, a large resource overhead is required, otherwise the entire community cannot be covered. . Moreover, this will increase the reception complexity of the terminal device. Therefore, the second message in the 2-step random access process can carry RAR messages for a terminal device. At this time, if the method of generating RA-RNTI in the 4-step random access process is still used, then when multiple terminal devices send their respective preambles using the same PRACH resource, the RA-RNTI determined based on the PRACH resource message In the same way, it is impossible to distinguish the different second messages that the network devices responded to these terminal devices respectively.

Therefore, it is proposed in the embodiment of the present application that the network device and the terminal device can generate an RA-RNT based on the RAPID or Synchronous Signal Block (SSB or SS Block) index, and use the RA-RNT to perform random 2-step scheduling The downlink control channel of the second message is scrambled or descrambled during access. For different terminal devices, the selected RAPID and corresponding SSB index may be different, so for terminal devices that use different preambles for random access, the generated RA-RNTI for scrambling or descrambling the downlink control channel is also It can be different, so that the second message returned by the network device to different terminal devices can be identified, and the effective transmission of the second message in the 2-step random access process is realized.

It should be understood that in the 2-step random access process in the embodiment of the present application, the first message may also be called a new Msg 1 (New_Msg 1), and the second message may also be called a new Msg 2 (New_ Msg 2). Or, the first message and the second message can also be replaced by other words, which is not limited here.

FIG. 4 is a schematic flowchart of a random access method 400 according to an embodiment of the present application. The method described in FIG. 4 may be performed by a communication device, for example, a terminal device or a network device, the terminal device may be, for example, the terminal device 120 shown in FIG. 1, and the network device may be, for example, FIG. 1 The network device 110 shown in. As shown in FIG. 4, the random access method 400 may include some or all of the following steps. among them:

In 410, the RA-RNTI is generated according to the first index.

The first index includes the RAPID and/or SSB index (SSB index) of the terminal device.

In 420, the RA-RNTI is used to perform first processing on the downlink control channel.

The downlink control channel is used to schedule the second message in the 2-step random access process. The first processing includes scrambling or descrambling the downlink control channel, such as the CRC check bit of the downlink control channel Scrambling or descrambling.

Wherein, the second message in the 2-step random access process may include a random access response message and/or a conflict resolution message, for example. The random access response message may include, for example, TA adjustment messages, BI messages, and so on. Optionally, the second message may also include a C-RNTI allocation message and so on. In addition, the second message may also include other messages, such as RRC connection completion message, RRC re-establishment completion message, etc.

These messages can all be carried in a downlink data channel, such as a PDSCH, and the CRC check code of the downlink control channel, such as PDCCH, that schedules the PDSCH can be scrambled using the RA_RNTI.

It can be understood that the second message may include, for example, some or all of Msg 2 and Msg 4 in the 4-step random access process. Since the 2-step random access process has not yet entered the standardization stage, the content carried in the second message described here is only an example, and should not bring anything to the second message in the embodiments of the present application. limited.

In order to distinguish it from the RA-RNTI used in the 4-step random access process, the RA-RNTI in the 2-step random access process in the embodiment of the present application may also be called a new RA-RNTI (New_RA-RNTI), etc., here No limitation.

When initiating random access, the terminal device first determines the random access preamble used by itself. Optionally, the terminal device may randomly select a preamble for random access among multiple preamble sequences. Since the terminal device randomly selects the preamble, different terminal devices can greatly reduce the probability of collision of preamble sequences while selecting among multiple preamble sequences. Alternatively, the terminal device may also select the preamble based on other messages.

After the terminal device determines the preamble for random access, the terminal device can send the preamble to the network device through the first message. In addition to the preamble, the first message may also include a data channel. The data channel may be used to carry, for example, a reason for requesting to establish an RRC connection and/or an identification message of the terminal device required to establish the RRC connection.

It can be understood that the first message may include, for example, some or all messages in Msg 1 and Msg 3 in the 4-step random access process. Since the two-step random access process has not yet entered the standardization stage, the content carried in the first message described here is only an example, and should not bring anything to the first message in the embodiments of the present application. limited.

It should be understood that the reason for requesting the establishment of the RRC connection is related to the trigger event that initiates random access. For example, for initial access, the first message may include an RRC connection request, and the terminal device may initially establish a wireless connection to the network through the RRC connection request, and the terminal device will go from the RRC idle state to the RRC connected state; For handover, the first message may include the RRC handover complete message, and the terminal device needs to establish uplink synchronization with the new community after the handover; for connection reestablishment, the first message may include the RRC connection reestablishment request so that the terminal device can Reestablish wireless connection after RLF; for upstream data arrival, such as when reporting measurement reports or sending user data, the upstream transmission is "unsynchronized" or no available PUCCH resources are available for SR transmission, the first message may include upstream data , When there is no available PUCCH resource for SR transmission, the terminal device that is already in the uplink synchronization state is allowed to use RACH to replace the role of SR; for downlink data arrival, and the uplink transmission is not synchronized, the random access message may include downlink data ACK or NACK.

After the network device receives the first message sent by the terminal device and learns the preamble of the terminal device, optionally, the network device may generate the RA-RNTI according to the preamble; or, the network device may also be based on the terminal device’s The RA-RNTI is generated by other messages, for example, based on the SSB index of the terminal device.

After that, the network device may use the RA-RNTI to perform the first processing on the downlink control channel used to schedule the second message. The first processing may be scrambling the downlink control channel, for example, scrambling a cyclic redundancy check (Cyclic Redundancy Check, CRC) check bit of the downlink control channel. Specifically, after the network device encodes the original message of the downlink control channel, it can perform CRC check on the encoded message through the CRC check code, and use the RA-RNTI to check the CRC check bit of the downlink control channel Scrambling.

The network device sends the downlink control message scrambled using the RA-RNTI to the terminal device, and the terminal device obtains the message of the data channel carrying the second message in the downlink control channel. After receiving the downlink control channel, the terminal device needs to use the RA-RNTI to descramble it.

Similarly, the terminal device can also generate the RA-RNTI according to the preamble it selects; or, the terminal device can also generate the RA-RNTI based on other information of the terminal device, for example, based on the SSB index of the terminal device.

Of course, the RA-RNTI may also be generated by the network device and indicated to the terminal device, that is, the terminal device receives the RA-RNTI sent by the network device.

The terminal device uses the RA-RNTI generated in 410 to descramble the downlink control channel used to schedule the second message, so as to obtain the message of the data channel carrying the second message and store it in the data channel Receive the second message. Since the downlink control channel is scrambled through RA-RNTI, and the RA-RNT may be generated based on the first index, for example, based on the preamble selected by the terminal device, therefore, the second terminal device that uses a different preamble is scheduled The RA-RNTI used in the downstream control channel of each message is also different.

In this way, the second message in the 2-step random access process can carry a RAR message for a terminal device, and the downlink control channel used to schedule the second message can be generated through the first index based on the terminal device. RA-RNTI to identify, so as to achieve the effective transmission of the second message in the 2-step random access process.

Further, optionally, in 410, the communication device generates the RA-RNTI according to the first index, including: generating the RA- according to the first index and PRACH resource information used to send a random access preamble RNTI.

Wherein, the PRACH resource message includes, for example, at least one of the following messages: the position of the Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by the PRACH resource in the time domain, and the PRACH resource in the system frame The position of the occupied time slot, the number of the resource occupied by the PRACH resource in the frequency domain, and whether the PRACH resource uses a normal uplink carrier or a single uplink carrier in the frequency domain.

For example, taking the first index as RAPID as an example, the network device or terminal device may generate the RA-RNTI based on the following formula: New_RA-RNTI=1+RAP_id+preamble_number×s_id+preamble_number×symbol_number×t_id+preamble_number×symbol_number×slot_number×f_id+preamble_number×symbol_number×slot_number×frequency_number×ul_carrier_id.

Where RAP_id is the preamble index of the random access preamble sent by the terminal device, that is, RAPID, 0≤RAP_id>preamble_number; s_id is the first OFDM symbol of the PRACH resource used to send the random access preamble, 0≤s_id >symbol_number; t_id is the index of the first slot of the PRACH resource used to send the random access preamble, 0≤t_id>slot_number; f_id is the resource number of the PRACH resource in the frequency domain, 0≤ f_id>frequency_number; ul_carrier_id is the uplink carrier (UL carrier) used to send the random access preamble. A value of 0 indicates a normal uplink carrier, and a value of 1 indicates a single uplink carrier.

Among them, preamble_number is the total number of preambles used for 2-step random access in a PRACH occasion; symbol_number is the total possible index number of the starting symbol of PRACH occasion used for 2-step random access, slot_number It is the total index number of the first slot index in the slot of the PRACH occasion used by 2-step random access; frequency_number is the total number of frequency domain indexes of the PRACH occasion used by 2-step random access.

The terminal device or the network device can bring its preamble index and PRACH resource information into the formula according to the formula, thereby obtaining the RA-RNTI.

For example, when preamble_number=64, symbol_number=14, slot_number=80, frequency_number=8 in the above formula, the formula can become: RA-RNTI=1+RAP_id+64×s_id+64×14×t_id+64×14×80×f_id+64×14×80×8×ul_carrier_id.

Bringing the resource information of RAP_id and PRACH, namely s_id, t_id, f_id and ul_carrier_id into the formula, the RA-RNTI of the downlink control channel used for scrambling and descrambling the second message can be obtained.

The above preamble_number, symbol_number, slot_number, frequency_number and other parameters can also be other values. Optionally, all or part of these parameter values may be determined and configured by the network device to the terminal device, or agreed in advance in the protocol; or, the value of some of these parameters may be determined and configured by the network device Terminal equipment, and the value of another part of the parameters can be agreed by the agreement.

Optionally, the network device and the terminal device may also determine the RA-RNTI based only on the random access preamble index.

For example, taking the first index as RAPID as an example, the terminal device or network device may determine the RA-RNTI according to the formula New_RA-RNTI=1+RAP_id or New_RA-RNTI=1+RAP_id+offset, where offset is the network The offset value configured or pre-stored in the device.

In the method for determining the RA-RNTI described above, the RAP_id can be replaced by the SSB index, so that the terminal device and the network device can generate the downlink control channel for the second message descrambling and descrambling according to the SSB index. RA-RNTI. For example, the terminal device and the network device may determine the RA-RNTI according to the following formula and SSB index: New_RA-RNTI=1+SSB_index+SSB_number×s_id+SSB_number×symbol_number×t_id+SSB_number×symbol_number×slot_number×f_id+SSB_number×symbol_number×slot_number×frequency_number×ul_carrier_id; or, New_RA-RNTI=1+SSB_index; or, New_RA-RNTI=1+SSB_index+offset.

Among them, SSB_index is the fast index of the synchronization signal of the terminal device, that is, SSB index, 0≤SSB_index>SSB_number; s_id is the first OFDM symbol of the PRACH resource used to send the random access preamble, 0≤s_id>symbol_number; t_id is Index of the first slot of the PRACH resource used to send the random access preamble, 0≤t_id>slot_number; f_id is the resource number of the PRACH resource in the frequency domain, 0≤f_id>frequency_number; ul_carrier_id It is the uplink carrier (UL carrier) used to send the random access preamble. A value of 0 indicates a normal uplink carrier, and a value of 1 indicates a single uplink carrier.

Among them, SSB_number is the total number of SSB indexes used in an SSB burst set; symbol_number is the total possible index number of the starting symbol of the PRACH occasion used in 2 random access, slot_number is 2 steps The total number of indexes of the first slot index in the slot of the PRACH occasion used by random access; frequency_number is the total number of frequency domain indexes of the PRACH occasion used by 2 random access.

Optionally, in an embodiment of the present application, a mapping relationship between the preamble and RA-RNTI may also be established, so that the mapping relationship used for scrambling or descrambling is determined according to the mapping relationship between the preamble and RA-RNTI. RA-RNTI for two messages. For example, the network device may determine the target RA-RNTI used to scramble the second message as the RA-RNTI corresponding to the target preamble according to the target preamble used by the terminal device and the mapping relationship.

The above describes how the network equipment and the terminal equipment generate the RA-RNTI for scrambling the downlink control channel of the second message. However, considering that before the first message in the 2-step random access process is sent, the network device has not yet assigned TC-RNTI to the terminal device, because the network device is in Msg 2 for the 4-step random access process. The terminal equipment allocates TC-RNTI. Therefore, the embodiments of the present application also propose corresponding scrambling and descrambling solutions for the data channel in the first message.

Optionally, the method further includes: generating a first scrambling code sequence; using the first scrambling code sequence, performing second processing on the upstream data channel in the first message in the 2-step random access process.

Wherein, the first processing includes when scrambling the downstream control channel, the second processing includes descrambling the encoded message bits of the upstream data channel; or, the first processing includes when descrambling the downstream control channel, The second processing includes scrambling the encoded message bits of the upstream data channel.

Specifically, the network device and the terminal device can generate the first scrambling code sequence in the following two ways for the terminal device to scramble the data channel in the first message, and for the network device to perform the first The data channel in the message is descrambled.

Way 1 Optionally, the generating the first scrambling code sequence includes: determining the initial value of the first scrambling code sequence according to the RA-RNTI; and generating the first scrambling code sequence according to the initial value.

For example, the initial value of the first scrambling code sequence can be determined according to the obtained RA-RNTI and the formula, and the first scrambling code sequence can be obtained according to the initial value, where,. It should be understood that the process of obtaining the first scrambling code sequence according to the initial value may refer to the existing process of generating the scrambling code sequence based on the initial value, and for the sake of brevity, no further description is provided here.

Way 2 Optionally, the generating the first scrambling code sequence includes generating the first scrambling code sequence according to the first index and the mapping relationship between the multiple first indexes and the multiple first scrambling code sequences.

The first scrambling code sequence is the first scrambling code sequence corresponding to the first index among the plurality of first scrambling code sequences.

It should be understood that the mapping relationship includes a mapping relationship between multiple first indexes and multiple first scrambling code sequences, where each first index may correspond to one or more first scrambling code sequences, and each first scrambling code The sequence may correspond to one or more first indexes. The first scrambling code sequences corresponding to different first indexes may be the same or different, and the first indexes corresponding to different first scrambling code sequences may also be the same or different. In addition, the mapping relationship can be realized by means of a mapping table, or the mapping relationship can also be realized by other methods such as formulas and diagrams, which are not limited in the embodiments of the present application

As shown in Table 1, taking the first index as the preamble index as an example, if the RAPID of the preamble selected by the terminal device is index 1, then use sequence 1 to scramble the data channel in the first message; if the terminal device selects The RAPID of the preamble is index N-1, and the sequence N-1 is used to scramble the data channel in the first message.

Table I

Optionally, the network device or the terminal device may obtain the pre-stored mapping relationship, for example, the mapping relationship may be agreed in advance by the protocol. Or, the mapping relationship is determined and configured by the network device to the terminal device.

Optionally, the scrambling and descrambling of the data channel in the first message may also use the RA-RNTI in the 4-step random access process. The RA-RNTI may be, for example: RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id.

Where s_id is the first OFDM symbol of the PRACH resource where the random access preamble is located, 0≤s_id>symbol_number; t_id is the index of the first slot of the PRACH resource where the random access preamble is located , 0≤t_id>slot_number; f_id is the resource number of the PRACH resource in the frequency domain, 0≤f_id>frequency_number; ul_carrier_id is the uplink carrier (UL carrier) where the random access preamble is located, and a value of 0 indicates normal Uplink carrier. A value of 1 indicates a single uplink carrier.

By carrying the data channel in the first message of the random access process, the data channel is scrambled and descrambled based on the scrambling code sequence generated by the random access preamble index and/or synchronization signal block index of the terminal device Therefore, when the network device has not assigned any RNTI to the terminal device, the data channel can be descrambled and descrambled, so that the data channel can be sent through the first message to shorten the delay of the random access process.

In the embodiment of the present application, as described above, the RA-RNTI of the downlink control channel used for scrambling and descrambling the scheduling of the second message is the same as the RA-RNTI used to generate the first scrambling code sequence. Of course, the RA-RNTI used to scramble and descramble the downlink control channel and the RA-RNTI used to generate the first scrambling code sequence may also be different, for example, generated by RA-RNTI1 = f1 (RAPID) for scrambling and descrambling Scrambling the RA-RNTI1 of the CRC check bit of the downlink control channel, and generating RA-RNTI2 through RA-RNTI2 = f2 (RAPID) to further generate the first scrambling code sequence to scramble the data channel in the first message.

Optionally, there may be a mapping relationship between the preamble and the data channel carried in the first message. After obtaining the preamble in the first message, the network device can determine the information such as the resource location of the corresponding data channel.

It should also be understood that the method of the embodiment of the present application may be applied to a 4-step random access process, and may also be applied to a 2-step random access process. In addition, the method of the embodiment of the present application can be applied to various random access processes rather than only initial access. Moreover, the method of the embodiment of the present application can be applied to a contention based random access procedure (contention based RACH) and a non-contention based random access procedure (contention free RACH).

It should be noted that, without conflict, the embodiments described in this application and/or the technical features in each embodiment can be arbitrarily combined with each other, and the technical solution obtained after the combination should also fall within the scope of protection of this application .

In various embodiments of the present application, the size of the sequence numbers of the above processes does not mean the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not constitute the implementation process of the embodiments of the present application. Any limitation.

The communication method according to the embodiment of the present application is described in detail above. The device according to the embodiment of the present application will be described below with reference to FIGS. 5 to 7. The technical features described in the method embodiment are applicable to the following device embodiments.

FIG. 5 is a schematic block diagram of a communication device 500 according to an embodiment of the present application. As shown in FIG. 5, the communication device 500 includes a processing unit 510, which is used to:

Generate a random access wireless network temporary identifier RA-RNTI according to a first index, where the first index includes the random access preamble index RAPID and/or synchronization signal block SSB index of the terminal device;

Use the RA-RNTI to perform a first process on a downlink control channel, where the downlink control channel is used to schedule a second message in a 2-step random access process, and the first process includes controlling the downlink Channel scrambling or descrambling.

Therefore, the network device and the terminal device can generate the RA-RNT based on the RAPID or SSB index, and use the RA-RNT to scramble or descramble the second message in the 2-step random access process. For different terminal devices, the selected RAPID and corresponding SSB index may be different, so for the downlink control channel generated by the terminal device that uses different preambles for random access for scrambling/descrambling scheduling the second message RA-RNTI can also be different, so that the second message that the network device responds to different terminal devices can be distinguished, and the effective transmission of the second message in the 2-step random access process is realized.

Optionally, the first processing includes scrambling or descrambling CRC check bits of the downlink control channel.

Optionally, the processing unit 510 is specifically configured to generate the RA-RNTI according to the first index and resource information of a physical random access channel PRACH used to send a random access preamble.

Optionally, the PRACH resource information includes at least one of the following information: the position of the orthogonal frequency division multiplexing OFDM symbol occupied by the PRACH resource in the time domain, and the time when the PRACH resource is occupied in the system frame The position of the slot, the number of the resource occupied by the PRACH resource in the frequency domain, and whether the PRACH resource uses a normal uplink carrier or a single uplink carrier in the frequency domain.

Optionally, the processing unit 510 is further configured to: generate a first scrambling code sequence; use the first scrambling code sequence to perform an uplink data channel in the first message in the 2-step random access process A second process, wherein the first process includes when scrambling the downlink control channel, the second process includes descrambling the encoded message bits of the uplink data channel, or, the first process includes When descrambling the downlink control channel, the second processing includes scrambling the encoded message bits of the uplink data channel.

Optionally, the processing unit 510 is specifically configured to: determine the initial value of the first scrambling code sequence according to the RA-RNTI; and generate the first scrambling code sequence according to the initial value.

Optionally, the processing unit 510 is specifically configured to generate the first scrambling code sequence according to the first index and the mapping relationship between the multiple first indexes and the multiple first scrambling code sequences.

Optionally, the communication device further includes an acquisition unit or a transceiver unit 520, wherein: the acquisition unit is used to: acquire the pre-stored mapping relationship; the transceiver unit 520 is used to: the communication device is the When receiving a terminal device, receive the mapping relationship sent by a network device; or, when the communication device is the network device, send the mapping relationship to the terminal device.

Optionally, the first message in the 2-step random access process includes a random access preamble and the upstream channel, and the message carried in the upstream channel includes the reason for requesting establishment of a radio resource control RRC connection And/or identification information of the terminal device required for establishing the RRC connection.

Optionally, the second message in the 2-step random access process includes a random access response RAR message and/or a conflict resolution message.

It should be understood that the communication device 500 can perform the corresponding operations performed by the terminal device or the network device in the above method 400, and for the sake of brevity, no further details are provided here.

FIG. 6 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application. The communication device 600 shown in FIG. 6 includes a processor 610, and the processor 610 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 6, the communication device 600 may further include a memory 620. The processor 610 can call and run a computer program from the memory 620 to implement the method in the embodiments of the present application.

The memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.

Optionally, as shown in FIG. 6, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, may send messages or data to other devices, or receive other Messages or data sent by the device.

Among them, the transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include antennas, and the number of antennas may be one or more.

Optionally, the communication device 600 may specifically be a network device according to an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. Repeat again.

Optionally, the communication device 600 may specifically be a terminal device according to an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application. .

7 is a schematic structural diagram of a wafer according to an embodiment of the present application. The chip 700 shown in FIG. 7 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 7, the wafer 700 may further include a memory 720. The processor 710 can call and run a computer program from the memory 720 to implement the method in the embodiments of the present application.

The memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.

Optionally, the wafer 700 may further include an input interface 730. The processor 710 can control the input interface 730 to communicate with other devices or chips. Specifically, it can obtain messages or data sent by other devices or chips.

Optionally, the wafer 700 may further include an output interface 740. The processor 710 can control the output interface 740 to communicate with other devices or chips. Specifically, it can output messages or data to other devices or chips.

Optionally, the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, no further description is provided here.

Optionally, the wafer can be applied to the terminal equipment in the embodiments of the present application, and the wafer can implement the corresponding processes implemented by the terminal equipment in each method of the embodiments of the present application.

It should be understood that the wafers mentioned in the embodiments of the present application may also be referred to as system-level wafers, system wafers, wafer systems, or system-on-chip wafers.

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method embodiments may be completed by instructions in the form of hardware integrated logic circuits or software in the processor. The aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an existing programmable gate array (Field Programmable Gate Array, FPGA), or Other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly implemented and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a random storage memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically readable and writable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory. The processor reads the information in the memory and combines the hardware to complete the steps of the above method.

It can be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable and programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache memory. By way of example but not limitation, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory ( Synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (Double SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

It should be understood that the foregoing memory is exemplary but not limiting, for example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM) , DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memories in the embodiments of the present application are intended to include but are not limited to these and any other suitable types of memories.

8 is a schematic block diagram of a communication system 800 according to an embodiment of the present application. As shown in FIG. 8, the communication system 800 includes a network device 810 and a terminal device 820.

The network device 810 is used to: generate a random access wireless network temporary identifier RA-RNTI according to a first index, where the first index includes the RAPID and/or SSB index of the terminal device; use the RA-RNTI To scramble the downlink control channel.

The terminal device 820 is used to: generate a random access wireless network temporary identifier RA-RNTI according to a first index, where the first index includes the RAPID and/or SSB index of the terminal device; using the RA-RNTI, Descramble the downstream control channel.

Wherein, the downlink control channel is used to schedule the second message in the 2-step random access process.

The network device 810 may be used to implement the corresponding functions implemented by the network device in the above method 400, and the composition of the network device 810 may be as shown in the communication device 500 in FIG. 5, for simplicity, here No longer.

The terminal device 820 can be used to implement the corresponding functions implemented by the terminal device in the above method 400, and the composition of the terminal device 820 can be as shown in the communication device 500 in FIG. .

The embodiments of the present application also provide a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method of the embodiments of the present application. For simplicity, I will not repeat them here.

Optionally, the computer-readable storage medium can be applied to the mobile terminal/terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiments of the present application For the sake of brevity, I will not repeat them here.

An embodiment of the present application also provides a computer program product, including computer program instructions.

Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. This will not be repeated here.

Optionally, the computer program product can be applied to the terminal device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the terminal device in each method of the embodiment of the present application. Repeat again.

The embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on the computer, the computer is allowed to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, I will not repeat them here.

Optionally, the computer program can be applied to the terminal device in the embodiments of the present application. When the computer program is run on the computer, the computer is allowed to execute the corresponding process implemented by the terminal device in each method of the embodiment of the present application, for simplicity , Will not repeat them here.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is just an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. three situations. In addition, the character “/” in this article generally indicates that the related objects are a “or” relationship.

It should also be understood that in the embodiment of the present invention, “B corresponding to (corresponding to) A” means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B based on A does not mean determining B based on A alone, and B may also be determined based on A and/or other messages.

Persons of ordinary skill in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a division of logical functions. In actual implementation, there may be other divisions, for example, multiple units or elements may be combined or integrated To another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be electrical, mechanical or other forms.

The unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed on multiple network units . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone, or two or more units may be integrated into one unit.

If the function is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, the computer software product is stored in a storage medium, including several The instruction is used to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage media include: flash drives, mobile hard drives, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disks or optical discs, etc. can store program code Medium.

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

100‧‧‧Communication system 110‧‧‧Network equipment 120‧‧‧terminal equipment 400‧‧‧ A random access method of the present invention 410, 420‧‧‧ steps 500‧‧‧Communication equipment 510‧‧‧Processing unit 520‧‧‧ transceiver unit 600‧‧‧Communication equipment 610‧‧‧ processor 620‧‧‧Memory 630‧‧‧Transceiver 700‧‧‧chip 710‧‧‧ processor 720‧‧‧Memory 730‧‧‧ input interface 740‧‧‧Output interface 800‧‧‧Communication system 810‧‧‧Network equipment 820‧‧‧terminal equipment

FIG. 1 is a schematic diagram of a possible wireless communication system applied in an embodiment of the present application.

FIG. 2 is a schematic flow interaction diagram of 4-step random access.

Figure 3 is a schematic process interaction diagram of 2-step random access

4 is a schematic flowchart of a random access method according to an embodiment of the present application.

5 is a schematic block diagram of a communication device according to an embodiment of the present application.

6 is a schematic structural diagram of a communication device according to an embodiment of the present application.

7 is a schematic structural diagram of a wafer according to an embodiment of the present application.

8 is a schematic block diagram of a communication system according to an embodiment of the present application.

410, 420‧‧‧ steps

Claims (20)

A random access method includes: Generate a random access wireless network temporary identifier RA-RNTI according to a first index, where the first index includes the random access preamble index RAPID and/or synchronization signal block SSB index of the terminal device; Use the RA-RNTI to perform a first process on a downlink control channel, where the downlink control channel is used to schedule a second message in a 2-step random access process, and the first process includes controlling the downlink Channel scrambling or descrambling. The method according to item 1 of the patent application scope, wherein the first processing includes scrambling or descrambling the CRC check bits of the cyclic redundancy code check of the downlink control channel. The method according to item 1 of the patent application scope, wherein the generating a random access wireless network temporary identifier RA-RNTI according to the first index includes: The RA-RNTI is generated according to the first index and the resource information of the physical random access channel PRACH used to send the random access preamble. The method according to item 3 of the patent application scope, wherein the PRACH resource message includes at least one of the following messages: The position of the orthogonal frequency division multiplexing OFDM symbol occupied by the PRACH resource in the time domain, the position of the time slot occupied by the PRACH resource in the system frame, the number of the resource occupied by the PRACH resource in the frequency domain, And whether the PRACH resource uses a normal uplink carrier or a single uplink carrier in the frequency domain. The method according to item 1 of the patent application scope, wherein the method further comprises: Generate the first scrambling code sequence; Use the first scrambling code sequence to perform second processing on the uplink data channel in the first message in the 2-step random access process, where the first processing includes when scrambling the downlink control channel , The second processing includes descrambling the encoded message bits of the uplink data channel, or the first processing includes descrambling the downlink control channel, the second processing includes the uplink The encoded message bits of the data channel are scrambled. The method according to item 5 of the patent application scope, wherein the generating the first scrambling code sequence includes: Determine the initial value of the first scrambling code sequence according to the RA-RNTI; According to the initial value, the first scrambling code sequence is generated. The method according to item 5 of the patent application scope, wherein the generating the first scrambling code sequence includes: The first scrambling code sequence is generated according to the first index and the mapping relationship between the multiple first indexes and the multiple first scrambling code sequences. The method according to item 5 of the patent application scope, wherein the method further comprises: Obtain the pre-stored mapping relationship; or, When the method is executed by the terminal device, the terminal device receives the mapping relationship sent by the network device; or, When the method is executed by the network device, the network device sends the mapping relationship to the terminal device. The method according to item 5 of the patent application scope, wherein the first message in the 2-step random access process includes a random access preamble and the upstream channel, and the message carried in the upstream channel Including the reason for requesting to establish a radio resource control RRC connection and/or the identification information of the terminal equipment required to establish the RRC connection. The method according to item 1 of the patent application scope, wherein the second message in the 2-step random access process includes a random access response RAR message and/or a conflict resolution message. A communication device, including: The processing unit is configured to generate a random access wireless network temporary identifier RA-RNTI according to a first index, where the first index includes a random access preamble index RAPID and/or synchronization signal block SSB index of the terminal device; The processing unit is also used to perform the first processing on the downlink control channel using the RA-RNTI, wherein the downlink control channel is used to schedule the second message in the 2-step random access process. One process includes scrambling or descrambling the downlink control channel. The communication device according to item 11 of the patent application scope, wherein the first processing includes scrambling or descrambling the CRC check bits of the downlink control channel. The communication device according to item 11 of the patent application scope, wherein the processing unit is specifically used for: The RA-RNTI is generated according to the first index and the resource information of the physical random access channel PRACH used to send the random access preamble. The communication device according to item 13 of the patent application scope, wherein the PRACH resource message includes at least one of the following messages: The position of the orthogonal frequency division multiplexing OFDM symbol occupied by the PRACH resource in the time domain, the position of the time slot occupied by the PRACH resource in the system frame, the number of the resource occupied by the PRACH resource in the frequency domain, And whether the PRACH resource uses a normal uplink carrier or a single uplink carrier in the frequency domain. The communication device according to item 11 of the patent application scope, wherein the processing unit is further used to: Generate the first scrambling code sequence; Use the first scrambling code sequence to perform second processing on the uplink data channel in the first message in the 2-step random access process, where the first processing includes when scrambling the downlink control channel The second processing includes descrambling the encoded message bits of the uplink data channel, or the first processing includes descrambling the downlink control channel and the second processing includes the uplink data channel The encoded message bits are scrambled. The communication device according to item 15 of the patent application scope, wherein the processing unit is specifically used for: Determine the initial value of the first scrambling code sequence according to the RA-RNTI; According to the initial value, the first scrambling code sequence is generated. The communication device according to item 15 of the patent application scope, wherein the processing unit is specifically used for: The first scrambling code sequence is generated according to the first index and the mapping relationship between the multiple first indexes and the multiple first scrambling code sequences. The communication device according to item 15 of the patent application scope, wherein the communication device further includes an acquisition unit or a transceiver unit, wherein: The obtaining unit is configured to obtain the pre-stored mapping relationship; The transceiver unit is used to: receive the mapping relationship sent by a network device when the communication device is the terminal device; or, to the terminal device when the communication device is the network device Send the mapping relationship. The communication device according to item 15 of the patent application scope, wherein the first message in the 2-step random access process includes a random access preamble and the upstream channel, and the upstream channel carries The message includes a reason for requesting establishment of a radio resource control RRC connection and/or an identification message of the terminal device required to establish the RRC connection. The communication device according to item 11 of the patent application scope, wherein the second message in the 2-step random access process includes a random access response RAR message and/or a conflict resolution message.

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