WO2020020270A1 - 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

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on July 25, 2018, with application number 201810827475.6, with the invention name "Random Access Method and Communication Device", the entire contents of which are incorporated herein by reference.

Technical field

Embodiments of the present application relate to the field of communications, and in particular, to a method and a communication device for random access.

Background technique

In a 5G system or a New Radio (NR) system, when a terminal device performs Random Access (RA), a 2-step random access (2-step RA) method may be adopted. For example, the message (Message, abbreviated as "Msg") 1 during the 4-step random access (4-step RA) process, that is, the preamble and Msg3 are sent as the first message; the 4-step random access is sent Msg 2 and Msg 4 in the process are sent as the second message.

In the 4-step random access process, Msg2 includes a Random Access Response (RAR) message for multiple users, and in the 2-step random access process, Msg2 can include the RAR of only one user Message, for which the terminal device needs to be able to identify 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.

Summary of the Invention

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

According to 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, where the first index includes a random access preamble index RAPID of a terminal device and And / or the SSB index of the synchronization signal block; using 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 A process includes scrambling or descrambling the downlink control channel.

In a second aspect, a communication device is provided, and the communication device can execute the foregoing first aspect or the method in any optional implementation manner of the first aspect. Specifically, the communication device may include functional modules for performing the foregoing first aspect or the method in 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 configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory, and execute the foregoing first aspect or a method in any possible implementation manner of the first aspect.

According to a fourth aspect, a chip is provided for implementing the foregoing first aspect or the method in any possible implementation manner of the first aspect. Specifically, the chip includes a processor for invoking 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 that causes a computer to execute the foregoing first aspect or the method in any possible implementation manner of the first aspect.

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

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

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

BRIEF DESCRIPTION OF THE DRAWINGS

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 a 4-step random access.

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

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

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

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

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

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

detailed description

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 the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall 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, for example, a Global System for Mobile (GSM) system, a Code Division Multiple Access (CDMA) system, and a Wideband Code Division Multiple Access (Wideband Code Division Multiple Access) 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, LTE on 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), global Interconnected Microwave Access (WiMAX) Communication System Systems, wireless local area networks (WLAN), wireless local area networks (WLAN), wireless fidelity (WiFi), next-generation communication systems, or other communication systems.

Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but also support 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 this application can also be applied to these communications system.

Optionally, the communication system in the embodiment of the present application may be applied to a Carrier Aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) deployment. Network 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 a network device 110. The network device 110 may be a device that communicates with a terminal device. The network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located within the coverage area. Optionally, the network device 100 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system. (Evolutional NodeB, eNB or eNodeB), or a network-side device in an NR system, or a wireless controller in a Cloud Radio Access Network (CRAN), or the network device may be a relay station, an access point Point of entry, vehicle-mounted equipment, wearable equipment, network-side equipment in the next generation network, or network equipment in a public land mobile network (PLMN) that will evolve in the future.

The wireless communication system 100 further includes at least one terminal device 120 located within a coverage area of the network device 110. As the "terminal equipment" used herein includes, but is not limited to, connection via wired lines, 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 cellular networks, Wireless Local Area Networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM- FM broadcast transmitter; and / or another terminal device configured to receive / transmit communication signals; and / or Internet of Things (IoT) devices. A terminal device configured to communicate through a wireless interface may be referred to as a “wireless communication terminal”, a “wireless terminal”, or a “mobile terminal”.

The terminal device 120 may be mobile or fixed. Optionally, the terminal device 120 may refer to an access terminal, user equipment (UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication Device, user agent, or user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Processing (PDA), and wireless communication. Functional handheld devices, computing devices, or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or terminal devices in future evolved PLMNs. Among them, optionally, terminal devices 120 may also perform terminal direct device (D2D) communication.

Specifically, the network device 110 may provide services for a cell, and the terminal device 120 communicates with the network device 110 through a transmission resource (for example, a frequency domain resource or a spectrum resource) used by the cell, and the cell may be the network device 110 ( For example, a cell corresponding to a base station) may belong to a macro base station or a small cell (small cell). Here, the small cell may include: a city cell (micro cell), a micro cell (micro cell), a pico cell ( Pico cells, femto cells, etc. These small cells 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 the coverage range of each network device may include other numbers of terminal devices. The application example does not limit this.

Optionally, the wireless communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like in this embodiment of the present application is not limited thereto.

It should be understood that the device having a communication function in the network / system in the embodiments of the present application may be referred to as a communication device. 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 having a communication function, and the network device 110 and the terminal device 120 may be specific devices described above, and are not described herein again. The communication device may further include other devices in the communication system 100, such as other network entities such as a network controller, a mobile management entity, and the like, which is not limited in the embodiment of the present application.

After the cell search process, the terminal device has achieved downlink synchronization with the cell, so the terminal device can receive downlink data. However, the terminal equipment can only perform uplink transmission if it obtains uplink synchronization with the cell. The terminal device can establish a connection with the cell and obtain uplink synchronization through a random access procedure (Random Access Procedure, RAR). In other words, through random access, the terminal device can obtain uplink synchronization, and obtain a unique identifier assigned by the network device, that is, a Cell Radio Network Temporary Identity (C-RNTI). Therefore, random access can be applied not only in the initial access, but also in the case where the user's uplink synchronization is lost. In order to facilitate understanding, the random access process will be briefly introduced below with reference to FIG. 2 and FIG. 3.

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

(1) Initial access.

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

(2) Handover.

When a terminal device needs to establish uplink synchronization with a new cell, it needs to initiate random access in the new cell.

(3) RRC connection re-establishment.

The terminal device re-establishes the wireless connection after a radio link failure (Radio Link Failure) occurs.

(4) In the RRC connection state, when the downlink data arrives, the uplink is in an "unsynchronized" state.

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

(5) In the RRC connection state, when the uplink data arrives, the uplink is in an "unsynchronized" state or no physical uplink control channel (PUCCH) resource is available for scheduling request (SR) transmission.

When the uplink data arrives, for example, when a measurement report needs to be reported or data is sent, if the uplink is in an "unsynchronized" state, the terminal device can initiate a random access process; or, if the terminal device that is already in the uplink synchronization 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 "unsynchronized" state, the terminal device can initiate a random access process.

(6) In RRC connection state, in order to locate, a timing advance (TA) is needed.

In addition, random access may be triggered due to RRC active state transition (RRC_INACTIVE), request for other system information (OSI), or beam failure recovery (beam failure recovery).

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

Step 1, Msg1.

The terminal device sends Msg1 to the base station to tell the network device that the terminal device initiates a random access request. The Msg1 carries a Random Access Preamble (RAP), or a random access preamble sequence or preamble. Sequence, preamble, etc. At the same time, Msg1 can also be used for network equipment to estimate the transmission delay between it and the terminal equipment and use it to calibrate the uplink time.

Step 2. Msg 2.

After receiving the Msg1 sent by the terminal device, the network device sends the Msg2, that is, a Random Access Response (RAR) message to the terminal device. The Msg2 can be scrambled by using a Random Access Radio Network Temporary Identity (RA-RNTI). The Msg2 may carry, for example, Time Advance (TA) information, uplink authorization instructions such as configuration of uplink resources, and temporary cell-radio network temporary identity (TC-RNTI).

The terminal device monitors a physical downlink control channel (PDCCH) within a random access response time window (RAR window) to receive RAR messages 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.

If the terminal device successfully receives an RAR message, and the preamble index (preamble index) carried in the RAR message is the same as the index of the preamble sent by the terminal device through Msg1, it is considered that the RAR was successfully received, and the terminal is now The device can stop monitoring within the RAR time window.

Among them, Msg2 can include RAR messages for multiple terminal devices, and each terminal device's RAR message can include the random access preamble identifier (RAPD) (or RAPID) (or random access Into the preamble index), information for transmitting Msg3 resources, TA adjustment information, TC-RNTI, and so on. In the NR standard, the RAR message can be scheduled using the downlink control information (DCI) format (DCI) format 1-0, and the PDCCH scheduling the RAR message can be scrambled using the above-mentioned RA-RNTI.

Step 3. Msg.

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 Msg3 at the RRC layer and sends it to The network device sends Msg3. It needs to carry identification information of the terminal device and the like.

Specifically, for different random access triggering events, Msg3 in step 3 of the 4-step random access process may include different contents for scheduled transmission (Scheduled Transmission).

For example, for the initial access scenario, Msg3 includes an RRC Connection Request (RRC Connection Request) generated by the RRC layer, which at least carries non-access stratum (NAS) identification information of the terminal device, and can also carry, for example, Serving-Temporary Mobile Subscriber Identity (S-TMSI) or random number of the terminal device; For connection reestablishment scenarios, Msg3 includes RRC Connection Re-establishment Request generated by the RRC layer, It does not carry any NAS messages. In addition, it can also carry, for example, Cell Radio Network Temporary Identifier (C-RNTI) and Protocol Control Information (Protocol Control Information) (PCI), etc. For the switching scenario, Msg3 includes the RRC layer The generated RRC Handover Complete message and the C-RNTI of the terminal device can also carry, for example, a Buffer Status Report (BSR); for other triggering events such as the scenario where the uplink / downlink data arrives, Msg3 is at least The C-RNTI including the terminal equipment is required.

It should be noted that uplink transmission usually uses terminal device specific information, such as using C-RNTI to scramble the data carried in the uplink shared channel (Uplink Shared Channel, UL-SCH). However, at this time, the conflict has not yet been resolved. Therefore, Msg3 cannot be scrambled based on C-RNTI, and only TC-RNTI can be used.

Step 4. Msg 4.

The network device sends Msg4 to the terminal device, and the terminal device correctly receives Msg4 to complete the contention resolution. For example, during the RRC connection establishment process, Msg 4 may carry an RRC connection establishment message.

Since the terminal device in step 3 will carry its own unique identifier in Msg3, such as C-RNTI or identification information from the core network (such as S-TMSI or a random number), the network device will The unique identifier of the terminal device is carried in Msg 4 to specify the terminal device that wins the competition. The other terminal devices that did not win the competition will re-initiate random access. The PDCCH of Msg4 can be scrambled by TC-RNTI.

In a 5G system, when a terminal device performs random access, in addition to the random access using the above 4-step random access method, a 2-step random access method can also be used. One possible method is to send messages Msg1 and Msg3 in the 4-step random access process as the first message; and use Msg2 and Msg4 in the 4-step random access process as the second message. To send.

As shown in Figure 3, the 2-step random access process can include the following two steps:

Step 1. The terminal device sends a 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 (PUSCH). The uplink channel may carry, for example, the identification information of the terminal device and the reason for the RRC request. The first message is similar to some or all of the information carried in Msg 1 and Msg 3 in 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, conflict resolution information (including a unique identifier of the terminal device generated in the competition), C-RNTI allocation information, and the like. The RAR message may include TA adjustment information, backoff (Backoff, BI) information. This second message is similar to some or all of the information carried in Msg 2 and Msg 4 in the 4-step random access process.

It should be understood that FIG. 2 or FIG. 3 is merely an example. Since the 2-step random access process has not yet entered the standardization stage, only the example of FIG. 3 is introduced here. There are other possibilities for the definition of each random access message involved, and the 2-step random access is not limited. Other definitions of each random access message in the process. The method described in the embodiment of the present application is applicable to all other 2-step random access procedures.

In the 4-step random access process, Msg2 may include different RAR messages for multiple terminal devices. In the 2-step random access process, the second message may carry a RAR message for a terminal device, and may also carry a conflict resolution message for the terminal device (that is, information related to the identity of the terminal device in the first message). ), C-RNTI allocation information, etc. It may also carry, for example, RRC connection establishment information.

Each cell can have 64 available preambles, and each terminal device can select one of them for random access, and send the selected preamble through the Physical Random Access Channel (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 information in Msg 2 and Msg 4 in the 4-step random access process, and because Msg 4 may also carry information such as RRC connection establishment information Information with very large equal bit overhead, if the above information for multiple terminal devices is still carried in the second message, in order to cover these terminal devices in the cell, a large resource overhead is required, otherwise the entire cell cannot be covered. In addition, this will increase the reception complexity of the terminal device. Therefore, the second message in the 2-step random access process may carry an RAR message for one terminal device. At this time, if the RA-RNTI is still generated in the 4-step random access process, then the RA-RNTI determined based on PRACH resource information is used when multiple terminals use the same PRACH resources to send their preambles. The RNTI is also the same, and it is impossible to distinguish the different second messages that the network device responds to these terminal devices.

Therefore, the embodiment of the present application proposes that the network device and the terminal device may generate an RA-RNT based on an RAPID or a Synchronous Signal Block (SSB or SS Block) index, and use the RA-RNT pair for scheduling a 2-step random access The downlink control channel of the second message is scrambled or descrambled during the incoming process. For different terminal equipment, the RAPID and corresponding SSB index selected may be different. Therefore, for terminal equipment that uses different preambles for random access, the RA-RNTI generated for scrambling or descrambling the downlink control channel is also It can be different, so that the second message that the network device responds 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 procedure in the embodiment of the present application, the first message may also be called New Msg1 (New_Msg), and the second message may also be called New Msg 2 (New_Msg 2). Alternatively, the first message and the second message may also be replaced by other words, which are not limited in this regard.

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 executed by a communication device. The communication device may be, 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, the device shown in FIG. 1.示 的 网络 设备 110。 The network device 110 shown. As shown in FIG. 4, the random access method 400 may include some or all of the following steps. among them:

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

The first index includes a RAPID and / or an 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 a second message in the 2-step random access process. The first process includes scrambling or descrambling the downlink control channel, for example, performing a CRC check bit on the downlink control channel. Scrambling or descrambling.

The second message in the 2-step random access process may include, for example, a random access response message and / or a conflict resolution message. The random access response message may include TA adjustment information, BI information, and the like, for example. Optionally, the second message may further include C-RNTI allocation information and the like. In addition, the second message may also include other information, such as an RRC connection completion message and an RRC reconstruction completion message.

These pieces of information may be carried in a downlink data channel such as PDSCH, and the CRC check code of the downlink control channel such as PDCCH scheduling the PDSCH may be scrambled by using the RA_RNTI.

It can be understood that the second message may include, for example, some or all of the information in 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 be brought to the second message in the embodiment of the present application. Any restrictions.

In order to distinguish 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 restrictions.

When a terminal device initiates random access, it first determines the random access preamble that it uses. Optionally, the terminal device may randomly select a preamble used for random access by itself among a plurality of preamble sequences. Because the preamble is randomly selected by the terminal device, different terminal devices can select a plurality of preamble sequences while greatly reducing the probability of collision of the preamble sequences. Alternatively, the terminal device may also select the preamble based on other information.

After the terminal device determines a preamble for random access, the terminal device may send the preamble to the network device through a first message. In addition to the preamble, the first message may include a data channel. The data channel may be used, for example, to carry a reason for requesting establishment of an RRC connection and / or identification information 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 of the information in Msg 1 and Msg 3 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 first message described here is only an example, and should not be brought to the first message in the embodiment of the present application. Any restrictions.

It should be understood that the reason for requesting establishment of an RRC connection is related to a trigger event that initiates random access. For example, for initial access, the first message may include an RRC connection request. The RRC connection request may be used by the terminal device to initially establish a wireless connection with the network. The terminal device will change from the RRC idle state to the RRC connected state. The first message may include an RRC handover completion message. At this time, the terminal device needs to establish uplink synchronization with the new cell after the handover. For connection reestablishment, the first message may include an RRC connection reestablishment request, so that the terminal device is in RLF. After the wireless connection is re-established, when the uplink data arrives, for example, when a measurement report needs to be reported or user data is sent, the uplink transmission is “unsynchronized” or no PUCCH resources are available for SR transmission. The first message may include uplink data. The available PUCCH resources are used to allow the terminal equipment that is already in the uplink synchronization state to use the RACH instead of the SR when the SR is transmitted. For the arrival of downlink data and the uplink transmission is not synchronized, the random access information may include an ACK for downlink data 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 can generate an RA-RNTI based on the preamble; or the network device can also generate based on other information of the terminal device The RA-RNTI is, for example, generated based on the SSB index of the terminal device.

After that, the network device can use the RA-RNTI to perform the first processing on the downlink control channel used for scheduling the second message. The first process may be scrambling processing on the downlink control channel, for example, scrambling a cyclic redundancy check (Cyclic Redundancy Check, CRC) check bit of the downlink control channel. Specifically, after encoding the original information of the downlink control channel, the network device may perform a CRC check on the encoded information by using a CRC check code, and use the RA-RNTI to add the CRC check bits of the downlink control channel. Disturb.

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

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

Of course, the RA-RNTI may also be generated by the network device and instructed 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 information of a data channel carrying the second message, and in the data channel Receive this second message. Since the downlink control channel is scrambled by 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, the second terminal of the terminal device using a different preamble is scheduled. The RA-RNTI used for the downlink control channel of a message is also different.

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

Further, optionally, in 410, the communication device generating the RA-RNTI according to the first index includes: generating the RA- according to the first index and resource information of a PRACH for sending a random access preamble. RNTI.

The PRACH resource information includes, for example, at least one of the following information: Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the PRACH resource in the time domain, the PRACH resource in the system frame The position of the time slot occupied in the channel, 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 can 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.

Among them, 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 in two-step random access within a PRACH occasion (PRACH Occasion); symbol_number is the total number of possible indexes of the starting symbol of PRACH occasion used in 2-step random access, slot_number It is the total number of indexes of the first slot index in the slot where the PRACH Occasion used by 2-step random access is located; frequency_number is the total number of frequency-domain indexes of PRACH Occasion used by 2-step random access.

The terminal device or the network device may 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, and frequency_number = 8 in the above formula, the formula can be changed to:

RA-RNTI = 1 + RAP_id + 64 × s_id + 64 × 14 × t_id + 64 × 14 × 80 × f_id + 64 × 14 × 80 × 8 × ul_carrier_id.

By bringing the resource information of RAP_id and PRACH, that is, s_id, t_id, f_id, and ul_carrier_id into this formula, the RA-RNTI of the downlink control channel used to scramble and dispatch the second message can be obtained.

The aforementioned parameters such as preamble_number, symbol_number, slot_number, frequency_number may 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 the protocol in advance; or, the values of some of these parameters may be determined by the network device and configured to the terminal device , And the value of another part of the parameter can be agreed by the agreement.

Optionally, the network device and the terminal device may also determine the RA-RNTI only based 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 device configuration Or pre-stored in the device.

In the method for determining RA-RNTI described above, the RAP_id in it can be replaced with the SSB index, so that the terminal device and the network device can generate an RA of the downlink control channel for scrambling and scheduling the second message according to the SSB index. -RNTI. For example, terminal equipment and network equipment can 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 cluster set; symbol_number is the total possible index number of the starting symbol of PRACH Occasion used in 2-step random access, and slot_number is 2 steps The total number of indexes of the first slot index in the slot where the PRACH Occasion used by random access is located; frequency_number is the total number of frequency domain indexes of PRACH Occasion used by 2-step random access.

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

It was described above how the network equipment and the terminal equipment generate the RA-RNTI for scrambling the downlink control channel for scheduling the second message. However, considering that before sending the first message in the 2-step random access process, the network device has not yet assigned a TC-RNTI to the terminal device because the network device is the terminal device in Msg 2 in the 4-step random access process. The TC-RNTI is allocated. Therefore, the embodiment of the present application also proposes a corresponding scrambling and descrambling solution for the data channel in the first message.

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

Wherein, the first process includes when scrambling the downlink control channel, the second process includes descrambling the encoded information bits of the uplink data channel; or the first process includes when descrambling the downlink control channel The second process includes scrambling the encoded information bits of the uplink data channel.

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

Way 1

Optionally, the generating a first scrambling code sequence includes: determining an 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 may be determined according to the obtained RA-RNTI and the formula c _init = n _RA-RNTI × 2 ¹⁵ + n _ID , and the first scrambling code sequence is obtained according to the initial value, where ,

It should be understood that, for a process of obtaining the first scrambling code sequence according to the initial value, reference may be made to an existing process of generating a scrambling code sequence based on the initial value.

Way 2

Optionally, the generating a first scrambling code sequence includes generating the first scrambling code sequence according to the first index and a mapping relationship between a plurality of first indexes and a plurality of first scrambling code sequences.

The first scrambling code sequence is a 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 may be implemented by a mapping table, or the mapping relationship may also be implemented by other methods such as formulas and icons, 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, the data channel in the first message is scrambled by using sequence 1; The RAPID of the preamble is the index N-1, and then the sequence N-1 is used to scramble the data channel in the first message.

Table I

Random access preamble index	First scrambling sequence
Index 1	Sequence 1
Index 2	Sequence 2
...	...
Index N-1	Sequence N-1
Index N	Sequence N

Optionally, the network device or the terminal device may obtain the pre-stored mapping relationship, for example, the mapping relationship may be predetermined in a protocol. Alternatively, 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.

Wherein, 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. A value of 0 indicates normal Uplink carrier. A value of 1 indicates a single uplink carrier.

The data channel is carried in the first message in the random access process, and the data channel is descrambled based on the scrambling code sequence generated by the terminal device's random access preamble index and / or synchronization signal block index. Therefore, the descrambling of the data channel can be realized when the network device has not allocated any RNTI to the terminal device, so that the data channel can be sent through the first message to reduce the delay of the random access process.

In the embodiment of the present application, as described above, the RA-RNTI used for scrambling and descrambling the downlink control channel for scheduling the second message is the same as the RA-RNTI used for generating the first scrambling code sequence. Of course, the RA-RNTI used to scramble and descramble the downlink control channel may be different from the RA-RNTI used to generate the first scrambling code sequence. For example, RA-RNTI1 = f1 (RAPID) is used to generate scramble and descramble RA-RNTI1, which scrambles the CRC check bits of the downlink control channel, and generates RA-RNTI2 by RA-RNTI2 = f2 (RAPID) to further generate a 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 the network device obtains the preamble in the first message, it can determine information about the data channel corresponding to the network device, such as the resource location.

It should also be understood that the method in 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 in the embodiment of the present application can be applied to various random access processes instead of just initial access. In addition, the method in the embodiment of the present application can be applied to a contention-based random access process (contention based RACH) and a non-contention-based random access process (contention free RACH).

It should be noted that, under the premise of no 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 into the protection scope 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. The execution order of each process should be determined by its function and internal logic, and should not deal with the implementation process of the embodiments of the present application. Constitute any limitation.

The communication method according to the embodiment of the present application is described in detail above. The apparatus according to the embodiment of the present application will be described below with reference to FIGS. 5 to 8. The technical features described in the method embodiment are applicable to the following apparatus 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. The processing unit 510 is configured to:

Generating 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 a synchronization signal block SSB index of the terminal device;

Using the RA-RNTI to perform first processing 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 processing includes controlling the downlink Channel scrambling or descrambling.

Therefore, the network device and the terminal device can generate 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. Therefore, for the downlink control channel for scrambling / descrambling scheduling of the second message generated by the terminal device using different preambles for random access, The 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 a CRC check bit 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 for sending a random access preamble.

Optionally, the PRACH resource information includes at least one of the following information: a position of an orthogonal frequency division multiplexed OFDM symbol occupied by the PRACH resource in a time domain, and a position of the PRACH resource occupied in a system frame. The position of the 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.

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

Optionally, the processing unit 510 is specifically configured to: determine an 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 a mapping relationship between a plurality of first indexes and a plurality of first scrambling code sequences.

Optionally, the communication device further includes an obtaining unit or a transmitting and receiving unit 520, wherein: the obtaining unit is configured to: obtain the pre-stored mapping relationship; and the receiving and sending unit 520 is configured to: When the terminal device receives the mapping relationship sent by the 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 uplink channel, and information carried in the uplink channel includes a reason for requesting establishment of a radio resource control RRC connection And / or identification information of the terminal device required to establish 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 may perform corresponding operations performed by the terminal device or the network device in the foregoing method 400. For brevity, details are not described herein again.

FIG. 6 is a schematic structural diagram of a communication device 600 according to 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 a 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 may call and run a computer program from the memory 620 to implement the method in the embodiment 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, and specifically, may send information or data to other devices, or receive other Information or data sent by the device.

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 the network device in the embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method in the embodiment of the present application. .

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

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

Optionally, as shown in FIG. 7, the chip 700 may further include a memory 720. The processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment 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 chip 700 may further include an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips. Specifically, the processor 710 may obtain information or data sent by the other devices or chips.

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

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, details are not described herein again.

Optionally, the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application. For brevity, it will not be repeated here.

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

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip and has a signal processing capability. In the implementation process, each step of the foregoing method embodiment may be completed by using an integrated logic circuit of hardware in a processor or an instruction in a form of software. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (Field, Programmable Gate Array, FPGA), or other Programming logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. A 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 combination with the embodiments of the present application may be directly implemented by a hardware decoding processor, or may be performed by using a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the foregoing method in combination with its hardware.

It can be understood that the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), and an electronic memory. Erase programmable read-only memory (EPROM, EEPROM) or flash memory. The volatile memory may be Random Access Memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (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 restrictive. For example, the memory in the embodiment of the present application may also be a static random access memory (Static RAM, SRAM), a dynamic random access memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (Synchronous RAM, 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 Connection Dynamic random access memory (Synch Link DRAM, SLDRAM) and direct memory bus random access memory (Direct RAMbus RAM, DRRAM) and so on. That is, the memories in the embodiments of the present application are intended to include, but not limited to, these and any other suitable types of memories.

FIG. 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 configured to generate a random access wireless network temporary identifier RA-RNTI according to a first index, where the first index includes a RAPID and / or SSB index of a terminal device; using the RA-RNTI, The downlink control channel is scrambled.

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

The downlink control channel is used to schedule a second message in a 2-step random access process.

The network device 810 may be used to implement the corresponding functions implemented by the network device in the foregoing method 400, and the composition of the network device 810 may be as shown in the communication device 500 in FIG. 5. For brevity, details are not described herein again. .

The terminal device 820 may be used to implement the corresponding functions implemented by the terminal device in the foregoing method 400, and the composition of the terminal device 820 may be as shown in the communication device 500 in FIG. 5. For brevity, details are not described herein again. .

An embodiment of the present application further provides a computer-readable storage medium for storing a computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application. For simplicity, here No longer.

Optionally, the computer-readable storage medium can be applied to the terminal device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the terminal device in each method of the embodiments of the present application. For simplicity, here No longer.

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

Optionally, the computer program product can be applied to the network device in the embodiment of the present application, and the computer program instruction causes the computer to execute a corresponding process implemented by the network device in each method in the embodiment of the present application. More details.

Optionally, the computer program product can be applied to the terminal device in the embodiment of the present application, and the computer program instruction causes the computer to execute a corresponding process implemented by the terminal device in each method in the embodiment of the present application. More details.

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

Optionally, the computer program may be applied to a network device in the embodiment of the present application. When the computer program is run on a computer, the computer is caused to execute a corresponding process implemented by the network device in each method in the embodiment of the present application. , Will not repeat them here.

Optionally, the computer program may be applied to a terminal device in the embodiment of the present application. When the computer program is run on a computer, the computer is caused to execute a corresponding process implemented by the terminal device in each method in the embodiment of the present application. , 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 document is only a kind of association relationship describing related objects, which means that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and exists alone B these three cases. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

It should also be understood that, in the embodiment of the present application, “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, but also determining B based on A and / or other information.

Those of ordinary skill in the art may realize that the units and algorithm steps of each example described in connection 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 and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods 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 logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or may be combined. Integration into 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, which may be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, 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 objective 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 of the units may exist separately physically, or two or more units may be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application is essentially a part that contributes to the existing technology or a 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 instructions are used to cause 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 method described in the embodiments of the present application. The aforementioned storage media include: U disks, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks or compact discs, and other media that can store program codes .

The above is only a 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 protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims (26)

1. A method for random access, characterized in that the method includes:

   Generating 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 a synchronization signal block SSB index of the terminal device;

   Using the RA-RNTI to perform first processing 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 processing includes controlling the downlink Channel scrambling or descrambling.
2. The method according to claim 1, wherein the first processing comprises scrambling or descrambling a cyclic redundancy code check (CRC) check bit of the downlink control channel.
3. The method according to claim 1 or 2, wherein the generating a random access wireless network temporary identity RA-RNTI according to the first index comprises:

   Generating the RA-RNTI according to the first index and resource information of a physical random access channel PRACH for transmitting a random access preamble.
4. The method according to claim 3, wherein the PRACH resource information includes at least one of the following information:

   The position of the orthogonal frequency division multiplexed OFDM symbol occupied by the PRACH resource in the time domain, the position of the time slot occupied by the PRACH resource in a 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.
5. The method according to any one of claims 1 to 4, further comprising:

   Generating a first scrambling code sequence;

   Using the first scrambling code sequence to perform a second process on an uplink data channel in a first message in the 2-step random access process, wherein the first process includes scrambling the downlink control channel When the second processing includes descrambling the encoded information bits of the uplink data channel, or when the first processing includes descrambling the downlink control channel, the second processing includes descrambling the The encoded information bits of the uplink data channel are scrambled.
6. The method according to claim 5, wherein the generating a first scrambling code sequence comprises:

   Determining an initial value of the first scrambling code sequence according to the RA-RNTI;

   Generating the first scrambling code sequence according to the initial value.
7. The method according to claim 5, wherein the generating a first scrambling code sequence comprises:

   Generating the first scrambling code sequence according to the first index and the mapping relationship between the plurality of first indexes and the plurality of first scrambling code sequences.
8. The method according to any one of claims 5 to 7, wherein the method further comprises:

   Obtaining the pre-stored mapping relationship; or

   When the method is executed by the terminal device, the terminal device receives the mapping relationship sent by a network device; or

   When the method is executed by the network device, the network device sends the mapping relationship to the terminal device.
9. The method according to any one of claims 5 to 8, wherein the first message in the 2-step random access process includes a random access preamble and the uplink channel, and the uplink The information carried in the channel includes a reason for requesting establishment of a radio resource control RRC connection and / or identification information of the terminal device required to establish the RRC connection.
10. The method according to any one of claims 1 to 9, wherein the second message in the 2-step random access process includes a random access response RAR message and / or a conflict resolution message.
11. A communication device, wherein the communication device includes:

    A processing unit, 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 a synchronization signal block SSB index of the terminal device;

    The processing unit is further configured to perform first processing on a downlink control channel using the RA-RNTI, where the downlink control channel is used to schedule a second message in a 2-step random access process, and the first A process includes scrambling or descrambling the downlink control channel.
12. The communication device according to claim 11, wherein the first processing comprises scrambling or descrambling a CRC check bit of the downlink control channel.
13. The communication device according to claim 11 or 12, wherein the processing unit is specifically configured to:

    Generating the RA-RNTI according to the first index and resource information of a physical random access channel PRACH for transmitting a random access preamble.
14. The communication device according to claim 13, wherein the resource information of the PRACH includes at least one of the following information:

    The position of the orthogonal frequency division multiplexed OFDM symbol occupied by the PRACH resource in the time domain, the position of the time slot occupied by the PRACH resource in a 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.
15. The communication device according to any one of claims 11 to 14, wherein the processing unit is further configured to:

    Generating a first scrambling code sequence;

    Using the first scrambling code sequence to perform a second process on an uplink data channel in a first message in the 2-step random access process, wherein the first process includes scrambling the downlink control channel When the second processing includes descrambling the encoded information bits of the uplink data channel, or when the first processing includes descrambling the downlink control channel, the second processing includes descrambling the uplink data The encoded information bits of the channel are scrambled.
16. The communication device according to claim 15, wherein the processing unit is specifically configured to:

    Determining an initial value of the first scrambling code sequence according to the RA-RNTI;

    Generating the first scrambling code sequence according to the initial value.
17. The communication device according to claim 15, wherein the processing unit is specifically configured to:

    Generating the first scrambling code sequence according to the first index and the mapping relationship between the plurality of first indexes and the plurality of first scrambling code sequences.
18. The communication device according to any one of claims 15 to 17, wherein the communication device further comprises an acquisition unit or a transceiver unit, wherein:

    The acquiring unit is configured to acquire the pre-stored mapping relationship;

    The transceiver unit is configured to: when the communication device is the 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. Said mapping relationship.
19. The communication device according to any one of claims 15 to 18, wherein the first message in the 2-step random access process includes a random access preamble and the uplink channel, and the The information carried in the uplink channel includes a reason for requesting establishment of a radio resource control RRC connection and / or identification information of the terminal device required to establish the RRC connection.
20. The communication device according to any one of claims 11 to 19, wherein the second message in the 2-step random access process comprises a random access response RAR message and / or a conflict resolution message.
21. A terminal device, characterized in that the terminal device includes a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run a computer program stored in the memory to execute claim 1 The method according to any one of 10 to 10.
22. A network device, characterized in that the network device includes 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 claim 1 The method according to any one of 10 to 10.
23. A chip, characterized in that the chip includes a processor, the processor is configured to call and run a computer program from a memory, so that a device having the chip installed executes any one of claims 1 to 10. Methods.
24. A computer-readable storage medium, which is used for storing a computer program that causes a computer to execute the method according to any one of claims 1 to 10.
25. A computer program product, comprising computer program instructions, the computer program instructions causing a computer to execute the method according to any one of claims 1 to 10.
26. A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 10.

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