A random access method and apparatus

Abstract

An embodiment of the present application discloses a random access method and apparatus to flexibly indicate to a terminal how to obtain an RNTI, saving signaling overhead caused by feedback of random access responses. The method includes: a first terminal sends a first message to an access network device on a first random access resource, the access network device receives the first message and sends a first DCI for scheduling a response message corresponding to the first message, and the first terminal receives the first DCI; wherein the first DCI is scrambled with an RNTI, the RNTI is calculated according to parameters of the first random access resource and a bias, and the bias is indicated by first information. The solution of the present application is applicable to the fields of communication technology, artificial intelligence, vehicle networking, smart home networking, etc.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 202110688647.8 and the application title "A Method for Generating Random Access ID" filed with the National Intellectual Property Administration on June 22, 2021, the entire content of which is incorporated herein by reference. Technical Field

[0002] Embodiments of this application relate to the field of communication technologies, and in particular, to a random access method and apparatus. Background Art

[0003] Currently, when a terminal is in the idle state or the inactive state, if the terminal has service requirements, the terminal can select a suitable access network device and send a preamble on a random access occasion (RO) to perform random access, such as four-step random access or two-step random access, and after switching from the idle / inactive state to the connected state, access the cell and transmit uplink data to the access network device.

[0004] In the random access process, the downlink control information (DCI) scheduling the random access response can be scrambled with a radio network tempory identity (RNTI). Different types of terminals may share the same random access occasion (RO). How to design the determination method of the RNTI of the terminal has become a problem that has been discussed. Summary of the Invention

[0005] Embodiments of this application provide a random access method and apparatus to flexibly indicate to the terminal which method to use to obtain the RNTI and save the signaling overhead caused by feedback of the random access response.

[0006] To achieve the above object, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a random access method. A first terminal sends a first message to an access network device on a first random access resource, and the first terminal receives a first DCI from the access network device for scheduling a response message corresponding to the first message; wherein, the RNTI used to scramble the first DCI is calculated according to the parameters of the first random access resource and a bias, and the bias is indicated to the first terminal through first information.

[0008] Based on the method described in the first aspect, the terminal is instructed to calculate its own RNTI according to the parameters of the random access resource and the offset, and use the calculated RNTI to descramble the received DCI, and then receive its own response message according to the indication of the successfully descrambled DCI. That is, it is not limited to calculating the RNTI according to the parameters of the random access resource, but on this basis, a RNTI is calculated by combining an offset. The design method is different from the existing method, so that the terminal can calculate the RNTI according to the existing method or combine the offset to calculate the RNTI when the first information indicates the offset, and the calculation method is flexible and diverse.

[0009] In a second aspect, an embodiment of the present application further provides a random access method, where the method includes: an access network device receives a first message from a first terminal on a first random access resource, and sends a first DCI for scheduling a response message of the first message to the first terminal; wherein, the first DCI for scrambling is scrambled with an RNTI, and the RNTI is calculated according to the parameters of the first random access resource and an offset, and the offset is indicated to the first terminal through first information.

[0010] Based on the method described in the second aspect, calculate its own RNTI according to the parameters of the random access resource and the offset, that is, it is not limited to calculating the RNTI according to the parameters of the random access resource, but on this basis, a RNTI is calculated by combining an offset. The design method is different from the existing method, so that the terminal can calculate the RNTI according to the existing method or combine the offset to calculate the RNTI when the first information indicates the offset, and the calculation method is flexible and diverse.

[0011] In a possible design, the RNTI is calculated based on the parameters of the first random access resource and a bias, including: RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id + Nsymbol * Nslot * Nf * ul_carrier_id + bias; where the value of s_id is the index value of the symbol occupied by the first random access resource in a time slot, and the value range of s_id is [0, Nsymbol - 1]; the value of t_id is the index value of the time slot occupied by the first random access resource in a system frame, and the value range of t_id is [0, Nslot - 1]; the value of f_id is the index value of the frequency domain unit occupied by the first random access resource among Nf frequency domain units, and Nf is the maximum value of the frequency division multiplexing factor preset for random access; the value range of f_id is [0, C - 1]; C is a positive integer less than or equal to Nf, and the value of C is the frequency division multiplexing factor used by the first terminal for random access; the value of ul_carrier_id is the index value of the uplink carrier occupied by the first random access resource among Nc uplink carriers, and the value range of ul_carrier_id is [0, Nc - 1]; Nsymbol is the number of symbols included in a time slot, Nslot is the number of time slots included in a system frame, Nf is the maximum value of the frequency division multiplexing factor preset for random access, and Nc is the number of uplink carriers preset.

[0012] Based on this possible design, a bias is added to the RNTI obtained according to the parameters of the random access resource to obtain the RNTI for the first terminal to perform random access, that is, the RNTI for random access of different terminals is distinguished by adding a bias, which simplifies the system design. Especially in the case where different types of terminals share random access resources, it can be ensured that the RNTIs allocated to different types of terminals are different, so as to distinguish the random access initiated by different types of terminals by setting different RNTIs for different types of terminals and avoid random access conflicts.

[0013] In a possible design, the bias is zero. Based on this possible design, the first terminal can calculate the RNTI based on the formula: RNTI = 1 + s_id + A * t_id + A * B * f_id + A * B * C * ul_carrier_id. When the parameters of the random access resources used by different terminals are the same, the same DCI is used to schedule the response messages of different terminals, saving signaling overhead.

[0014] In a possible design, the first information includes a bias; alternatively, the first information includes the RO configuration information of the first type of terminal. When the value of the RO parameter included in the RO configuration information is the first value, it indicates that the bias is zero; alternatively, the first information includes the BWP configuration information of the first type of terminal. When the value of the BWP parameter included in the BWP configuration information is the second value, it indicates that the bias is zero; alternatively, the first random access resource is included in the shared random access resource, the shared random access resource corresponds to a bias of zero, and the first information includes the indication information indicating the shared random access resource.

[0015] Based on this possible design, the bias can be flexibly and effectively indicated in various ways.

[0016] In a possible design, the bias is the bias of the parameter of the first random access resource. The RNTI is calculated based on the parameter of the first random access resource and the bias, including: the RNTI is obtained according to the adjusted value of the parameter of the first random access resource, and the adjusted value is obtained by adding the bias to the value of the parameter of the first random access resource. That is, in the case where the starting frequency domain positions of the random access resources occupied by different terminals are different and the starting values of the parameters are different, by setting a bias, the starting values of the parameters of the random access resources of different terminals can be aligned, so that the RNTI calculated by different terminals based on the same calculation formula is the same, and the response messages of different terminals are scheduled by the same DCI scrambled with the same RNTI, saving signaling overhead.

[0017] In a possible design, the first information includes the bias of the parameter; alternatively, the bias of the parameter is calculated according to the RO configuration information of the second type of terminal, such as calculated according to the RO configuration information of the second type of terminal and the RO configuration information of the first type of terminal, or calculated according to the RO configuration information of the second type of terminal and the BWP configuration information of the first type of terminal. The first information includes the RO configuration information of the second type of terminal; the RO configuration information of the second type of terminal is used to indicate the RO time domain position, frequency division multiplexing coefficient, and starting frequency domain position of the second type of terminal; alternatively, the first random access resource is included in the shared random access resource, and the first information includes the first indication information; the first indication information is used to indicate the random access resource set and the shared random access resource in the random access resource set. Based on this possible design, the bias can be flexibly and effectively indicated in various ways.

[0018] In a possible design, the parameters of the first random access resource at least include the frequency domain index f_id, the offset of the parameter includes the offset of the frequency domain index f_id, and the RNTI is calculated according to the parameters of the first random access resource and the offset, including: RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id’ + Nsymbol * Nslot * Nf * ul_carrier_id; f_id’ = f_id + the offset, or, RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * (f_id + offset) + Nsymbol * Nslot * Nf * ul_carrier_id; the relevant descriptions of s_id, t_id, f_id, ul_carrier_id, A, B, and C are as described above and will not be elaborated.

[0019] In a possible design, the offset of f_id is less than Nf, where Nf is the maximum value of the frequency division multiplexing coefficient preset for random access, that is, to avoid setting an offset greater than the maximum frequency division multiplexing coefficient.

[0020] In a possible design, the first terminal belongs to the first type of terminal, and the first random access resource is included in the random access resources shared by the first type of terminal and the second type of terminal. That is, in the scenario of initiating random access on the shared random access resource, the method for determining RNTI described in the embodiments of the present application can be adopted.

[0021] In a possible design, the first type of terminal includes a reduced-capability redcap terminal, and the second type of terminal includes a non-redcap terminal; or, the first type of terminal includes a terminal supporting coverage enhancement, and the second type of terminal includes a terminal not supporting coverage enhancement; or, the first type of terminal includes a terminal supporting access network slicing, and the second type of terminal includes a terminal not supporting access network slicing. That is, the method described in the embodiments of the present application can be applied to the scenario where different types of terminals share random access resources, expanding the applicable range and improving the application flexibility.

[0022] In a third aspect, the present application provides a communication device, which may be a first terminal, a chip or a system-on-chip in the first terminal, or a functional module in the first terminal for implementing the method described in the first aspect or any possible design of the first aspect. Alternatively, the communication device may be an access network device, a chip or a system-on-chip in the access network device, or a functional module in the access network device for implementing the method described in the second aspect or any possible design of the second aspect. The communication device can implement the functions performed by the first terminal or the access network device in the above aspects or any possible designs, and the functions can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. For example, the communication device may include a sending unit and a receiving unit; further, the communication device may also include a processing unit.

[0023] In a possible design, the sending unit is configured to send a first message to an access network device on a first random access resource.

[0024] The receiving unit is configured to receive a first DCI from the access network device, where the first DCI is used to schedule a response message corresponding to the first message, the first DCI is scrambled with a radio network temporary identity RNTI, and the RNTI is calculated based on the parameters of the first random access resource and a bias, and the bias is indicated by a first piece of information.

[0025] In another possible design, the receiving unit is configured to receive a first message from a first terminal on a first random access resource. The sending unit is configured to send a first DCI of the access network device to the first terminal, where the first DCI is used to schedule a response message corresponding to the first message, the first DCI is scrambled with a radio network temporary identity RNTI, and the RNTI is calculated based on the parameters of the first random access resource and a bias, and the bias is indicated by a first piece of information.

[0026] Specifically, the determination method of the parameters of the first random access resource and the bias can be referred to as described in the first aspect, the second aspect, any possible design of the first aspect, or any possible design of the second aspect. At the same time, the execution actions of each unit of the communication device can be referred to as described in the first aspect, any possible design of the first aspect, the second aspect, or any possible design of the second aspect, and will not be elaborated here.

[0027] Fourthly, a communication device is provided. The communication device can be a first terminal, or a chip or a system-on-chip in the first terminal. The communication device can implement the functions performed by the first terminal in the above aspects or each possible design, and the functions can be implemented by hardware. Alternatively, the communication device can be an access network device, or a chip or a system-on-chip in the access network device. The communication device can implement the functions performed by the access network device in the above aspects or each possible design, and the functions can be implemented by hardware. In a possible design, the communication device can include: a processor and a communication interface. The processor and the communication interface can support the communication device to execute the method described in the first aspect or any possible design of the first aspect or the second aspect or any possible design of the second aspect. In another possible design, the communication device can further include a memory for storing necessary computer-executable instructions and data of the communication device. When the communication device runs, the processor executes the computer-executable instructions stored in the memory, so that the communication device executes the random access method described in the first aspect or any possible design of the first aspect or the second aspect or any possible design of the second aspect.

[0028] Fifthly, a computer-readable storage medium is provided. The computer-readable storage medium can be a readable non-volatile storage medium. Instructions are stored in the computer-readable storage medium. When it runs on a computer, it causes the computer to execute the random access method described in the first aspect or any possible design of the first aspect or the second aspect or any possible design of the second aspect.

[0029] Sixthly, a computer program product containing instructions is provided. When it runs on a computer, it causes the computer to execute the random access method described in the first aspect or any possible design of the first aspect or the second aspect or any possible design of the second aspect.

[0030] Seventhly, a communication device is provided. The communication device can be a first terminal, or a chip or a system-on-chip in the first terminal. The communication device includes one or more processors and one or more memories. The one or more memories are coupled to the one or more processors. The one or more memories are used to store computer program code. The computer program code includes computer instructions. When the one or more processors execute the computer instructions, the first terminal is caused to execute the random access method described in the first aspect or any possible design of the first aspect or the second aspect or any possible design of the second aspect.

[0031] Among them, for the technical effects brought by any one of the design manners from the fourth aspect to the seventh aspect, reference may be made to the technical effects brought by the first aspect or any possible design of the first aspect, which will not be elaborated herein.

[0032] In an eighth aspect, an embodiment of the present application provides a communication system, which may include: a first terminal and an access network device. The first terminal may execute the random access method described in the first aspect or any possible design of the first aspect, and the access network device may execute the random access method described in the second aspect or any possible design of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram for transmitting SSB;

[0034] Figure 2a Schematic diagram of 4-step random access;

[0035] Figure 2b Schematic diagram of 2-step random access;

[0036] Figure 3a Schematic diagram of scrambled DCI;

[0037] Figure 3b Schematic diagram of RA-RNTI and MsgB-RNTI allocation Figure 1 ;

[0038] Figure 3c Schematic diagram two of RA-RNTI and MsgB-RNTI allocation;

[0039] Figure 4a RO resource allocation for redcap terminal and non-redcap terminal Figure 1 ;

[0040] Figure 4b Schematic diagram two of RO resource allocation for redcap terminal and non-redcap terminal;

[0041] Figure 5 Simplified schematic diagram of a system architecture provided by an embodiment of the present application;

[0042] Figure 6 Schematic diagram of the composition of a communication device provided by an embodiment of the present application;

[0043] Figure 7 Flowchart of a random access method provided by an embodiment of the present application;

[0044] Figure 8 Schematic diagram of MAC RAR;

[0045] Figure 9It is the third RO resource allocation diagram for redcap terminals and non-redcap terminals;

[0046] Figure 10 It is a schematic diagram of the composition of a communication device 100 provided by an embodiment of the present application;

[0047] Figure 11 It is a schematic diagram of the composition of a communication device 110 provided by an embodiment of the present application;

[0048] Figure 12 It is a schematic diagram of the composition of a communication system provided by an embodiment of the present application. Detailed implementation manners

[0049] In a communication system, after the terminal is powered on or in the scenario of cell handover, the terminal can detect the synchronization signal block (SSB) sent by the surrounding access network devices, select the access network device that can provide network services for the terminal according to the SSB and system message sent by the access network device, initiate random access (RA) to the selected access network device on the RO corresponding to the SSB, access the cell covered by the access network device (or the cell corresponding to the SSB), and perform data transmission with the access network device through the radio resource control (RRC) connection between the terminal and the access network device.

[0050] In the embodiments of the present application, the SSB may include a synchronization signal (SS) and a physical broadcast channel (PBCH). The system information may include a master information block (MIB) and a system information block (SIB). The SS may be used for the terminal to synchronize with the transmission of the access network device. The system information may include some communication parameters of the cell, such as the configuration information of the initial bandwidth part (initial BWP) (which may be simply referred to as BWP configuration information), the size of the system bandwidth, the subcarrier spacing, and one or more of the frame structure configurations. Taking the cell (or sector) as the granularity, in order to enable the signal sent by the access network device to cover the entire cell, one cell may correspond to one or more SSBs, one SSB corresponds to one beam, and different beams correspond to SSBs with different numbers. The terminal in the cell may receive and detect the signal quality of one or more SSBs, and determine which beam corresponding to the SSB has signal quality meeting the standard according to the detection result. For example, the signal reception energy may be compared with a preset threshold, and the beam corresponding to the SSB exceeding the preset threshold meets the signal quality standard. For example, taking the access network device as a base station as an example, as Figure 1 shown, the base station uses 4 SSBs: SSB0 - SSB3 to cover a certain sector / cell. After the terminal detects the SSB0 - SSB3 sent by the base station, the terminal can measure the signal quality of these 4 SSBs. If it is determined that the beam corresponding to SSB2 can provide better signal quality and the provided signal quality exceeds the preset threshold, it is determined that the base station corresponding to the cell can provide network services for the terminal. If the terminal determines to access the cell, it initiates a random access to the base station on the RO corresponding to SSB2.

[0051] In the embodiments of the present application, the random access described above may refer to contention-based random access (or contention-based random access or competitive random access). This random access may include 4-step random access (which may be referred to as 4-step RA) or 2-step random access (which may be referred to as 2-step RA). In contrast to contention-based random access, there is also non-contention-based random access (or non-contention-based random access or non-competitive random access). Non-contention-based random access can be applied to cell handover or in an out-of-sync scenario where there is a need for downlink data transmission. Non-contention-based random access may refer to the random access initiated by the terminal using a specified preamble for non-contention-based random access on the RO designated by the access network device. It should be understood that unless otherwise specified, the random access described in the present application refers to contention-based random access, and non-contention-based random access is not discussed in the present application. The following introduces 4-step random access and 2-step random access:

[0052] Referring to Figure 2a , which is 4-step random access. As Figure 2a shown, 4-step random access may include: Step (1), the terminal selects a random access occasion (RO) and sends Message 1 (Msg1) to the access network device on the selected RO to notify the access network device of a random access request. Message 1 may include a preamble (or preamble or random access preamble). Step (2), after receiving Msg1, the access network device sends Message 2 (Msg2) to the terminal. Among them, Message 2 may include the scheduling information of Message 3 (Msg3), and Message 2 may be used to indicate to the terminal how to send Message 3. The terminal correspondingly receives Message 2. Step (3), the terminal sends Message 3 to the access network device according to Message 2. Step (4), the access network device sends Message 4 (Msg4) to the terminal. Message 4 may include the response message determined by the access network device for Msg3, and this response message may include information for contention resolution between terminals.

[0053] Referring to Figure 2b , which is 2-step random access. As Figure 2bAs shown in the figure, the two-step random access may include: Step (1), the terminal selects an RO, and sends a physical random access channel (PRACH) carrying message A (message A, MsgA) and a physical uplink shared channel (PUSCH) to the access network device on the selected RO. MsgA may include a preamble. Step (2), the access network device receives MsgA and replies to the terminal with message B (message B, MsgB). MsgB may include information for contention resolution between terminals.

[0054] Figure 2a , Figure 2b In the random access process shown in the figure, except that the first step is for the terminal to select an RO and send a preamble message, the messages transmitted in other steps need to be scheduled by the access network device, and the access network device needs to indicate the time-frequency resource location corresponding to the message. For example, after the access network device receives the preamble sent by the terminal on the RO, the access network device may send downlink control information (DCI) and a random access response (RAR) scheduled by the DCI (such as Msg2 or MsgB). The RAR is carried in the physical downlink shared channel (PDSCH). After the terminal sends the preamble on the RO, it starts to listen for the DCI sent to itself on the downlink, and then obtains the RAR sent to itself in the PDSCH scheduled by the DCI.

[0055] In the embodiments of this application, the response message may be referred to as a random access response (RAR) or a media access control random access response (MAC RAR). In 4-step RA, RAR may refer to Msg2, and in 2-step RA, RAR may refer to MsgB. The DCI scheduling the RAR may carry scheduling information for RAR transmission, such as the time-frequency resources occupied by the RAR, the modulation and coding method used, etc. The DCI is carried in the physical downlink control channel (PDCCH). A PDCCH will transmit DCIs sent to different terminals.

[0056] In order for the terminal to distinguish which DCI transmitted in the PDCCH is sent to itself, the DCI can be scrambled by using a radio network temporary identity (RNTI). The RNTI can be a sequence with a length of 16 bits (bit). The terminal monitors the DCI sent in the PDCCH on the downlink, and can descramble the DCI by using the RNTI. If the descrambling is successful, it is determined that the DCI is the DCI sent to itself, and then the RAR is obtained according to the indication of the DCI.

[0057] As Figure 3a shown, assuming that the RNTI is a sequence with a length of 16 bits, when the access network device sends the DCI, it will generate a check bit (such as a cyclic redundancy check (CRC)) according to the information of the encoded DCI, and the length of the check bit is also 16 bits. Then, the access network device performs an exclusive OR (XOR) operation on the 16-bit check bit by using the RNTI of the terminal, and encapsulates the processed check bit and the DCI together and sends them on the PDCCH. After receiving the DCI on the PDCCH, the terminal generates a corresponding check bit according to the received DCI, performs an exclusive OR operation on the generated check bit and its own RNTI, and compares the result of the exclusive OR operation with the check bit actually received by the terminal. If the two are the same, it means that the DCI is sent to itself.

[0058] In the embodiments of the present application, for ease of description, the RNTI used to scramble the DCI in the 4-step random access process can be referred to as RA-RNTI, and the RNTI used to scramble the DCI in the 2-step random access process can be referred to as MsgB-RNTI. There is an association relationship between the value of the RNTI and the RO used by the terminal to send the preamble. The RNTI can be determined according to the time-frequency resource position of the RO used by the terminal to send the preamble. For example, the RNTI can be determined according to the index value s_id of the symbol occupied by the RO, the index value t_id of the time slot occupied by the RO, the index value f_id of the frequency domain unit occupied by the RO, and the index value ul_carrier_id of the uplink carrier occupied by the RO.

[0059] For example, for RA-RNTI, the following formula (1) can be satisfied between RA-RNTI and RO:

[0060] RA-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id + Nsymbol * Nslot * Nf * ul_carrier_id.

[0061] For the MsgB-RNTI, the following formula (2) can be satisfied between the MsgB-RNTI and the RO:

[0062] MsgB-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id + Nsymbol * Nslot * Nf * ul_carrier_id + offset_1(offset_1) Formula (2)

[0063] Among them, the offset_1(offset_1) can be a preset integer greater than 0. For example, the value of the offset_1(offset_1) can be 17921. That is, by introducing the offset, it is possible to distinguish whether the DCI scrambled by the RNTI corresponds to 2-step RA or 4-step RA, avoiding random access conflicts between terminals initiating different RAs.

[0064] For example, assuming Nsymbol = 14, Nslot = 80, Nf = 8, Nc = 2, and offset_1 is equal to Nsymbol * Nslot * Nf * Nc, then as Figure 3b shown, the value range of the RA-RNTI for 4-step RA is [1, 17920], and the value range of the MsgB-RNTI for 4-step RA is [17921, 35840], and these two types of RNTIs do not overlap.

[0065] In the embodiments of the present application, the symbol "+" in each formula represents addition calculation, and the symbol "*" represents multiplication calculation. Among them, the symbol "*" can also be replaced by the symbol "×".

[0066] In the embodiments of the present application, the value of s_id is the index value (or called the number) of the symbol occupied by RO in a time slot. The index value of the symbol occupied by RO in a time slot can be called the absolute index value of the symbol occupied by RO in a time slot. A time slot may include Nsymbol symbols. Nsymbol may be pre-configured or pre-specified by the protocol, and Nsymbol is an integer greater than 0. For example, in the new radio (NR) system, it is specified that Nsymbol = 14 in the case of the normal cyclic prefix (NCP), that is, a time slot may include 14 symbols. Exemplarily, the Nsymbol symbols in a time slot can be sequentially numbered starting from 0, and the symbols 0 to symbol Nsymbol-1 in a time slot can be obtained. It should be noted that the present application is not limited to sequentially numbering the symbols in a time slot starting from 0, and the symbols in a time slot can also be sequentially numbered starting from 1 or other numbers, without limitation. The embodiments of the present application are only described by starting the numbering from 0. When the symbols in a time slot are sequentially numbered starting from 0, the value range of s_id is [0, Nsymbol-1].

[0067] In the embodiments of the present application, the value of t_id is the index value (or number) of the time slot occupied by RO in a system frame. The index value of the time slot occupied by RO in a system frame can be called the absolute index value of the time slot occupied by RO in a system frame. A system frame may include at most Nslot time slots. Nslot may be pre-configured or pre-specified by the protocol. For example, in the NR system, it is specified that Nslot = 80, that is, a system frame may include at most 80 time slots. If the Nslot time slots are sequentially numbered starting from 0, the time slots 0 to time slot Nslot-1 in a system frame can be obtained. It should be noted that the present application is not limited to sequentially numbering the time slots in a system frame starting from 0, and the time slots in a system frame can also be sequentially numbered starting from 1 or other numbers, without limitation. The present application is only described by starting the numbering from 0. When the time slots are sequentially numbered starting from 0, the value range of t_id is [0, Nslot-1].

[0068] In the embodiments of the present application, the value of f_id is the index value (or number) of the frequency domain unit occupied by the RO among Nf frequency domain units; the index value of the frequency domain unit occupied by the RO among Nf frequency domain units can be referred to as the absolute index value of the frequency domain unit occupied by the RO among Nf frequency domain units. Nf can be the maximum value of the frequency division multiplexing coefficient preset for random access. Nf can be pre-configured or pre-specified by the protocol. For example, in the NR system, it is specified that Nf = 8, that is, the frequency domain units for random access include at most 8 frequency domain units. If these 8 frequency domain units are sequentially numbered starting from 0, the frequency domain units for random access can be obtained as: frequency domain unit 0 to frequency domain unit 7. It should be noted that the present application is not limited to sequentially numbering the frequency domain units for random access starting from 0, and can also start numbering the frequency domain units for random access from 1 or other numbers, without limitation. The embodiments of the present application are only described by starting numbering from 0. In the case of sequentially numbering the frequency domain units starting from 0, the value range of f_id is [0, Nf - 1]. It should be understood that the frequency domain units described in the embodiments of the present application can be a bandwidth part (BWP) or a physical resource block (PRB) or other granularity frequency domain resources, without limitation.

[0069] In the embodiments of the present application, the value of ul_carrier_id is the index value of the uplink carrier occupied by the RO among Nc uplink carriers; the index value of the uplink carrier occupied by the RO among Nc uplink carriers can be referred to as the absolute index value of the uplink carrier occupied by the RO among Nc uplink carriers. Nc can be the number of uplink carriers preset for random access. Nc can be pre-configured or pre-specified by the protocol. For example, in the NR system, it is specified that Nc = 2, that is, there are 2 uplink carriers for random access. If these Nc uplink carriers are sequentially numbered starting from 0, the uplink carriers for random access can be obtained as: uplink carrier 0 to uplink carrier Nc - 1. It should be noted that the present application is not limited to sequentially numbering the uplink carriers for random access starting from 0, and can also start numbering the uplink carriers for random access from 1 or other numbers, without limitation. The embodiments of the present application are only described by starting numbering from 0. In the case of sequentially numbering the uplink carriers starting from 0, the value range of ul_carrier_id can be [0, Nc - 1].

[0070] As can be seen from the above formula, the parameters for calculating the RNTI are all determined by the time-frequency position of the RO that sends the preamble. In scenarios where multiple terminals (such as reduced capability (redcap) terminals and non-redcap terminals) share the same random access resource (such as RO) to send preambles or the parameters (time-domain position, frequency-domain index) of the random access resources used by multiple terminals to send preambles are the same, if the same calculation formula (the above formula (1) or formula (2)) is adopted, the calculated RNTI is the same, and the scrambled DCI is also the same, which is the same DCI, and it is impossible to distinguish which terminal's DCI through the RNTI. At this time, to solve this problem, different RNTI calculation formulas can be designed for different terminals to ensure that the RNTIs of different terminals are different, and the DCI of the terminal is scrambled with the RNTI of the terminal. Since the RNTIs of different terminals are different, it is possible to distinguish which terminal's DCI through the RNTI.

[0071] For example, the 4-step RA of non-redcap terminals can use the above formula (1) to calculate the RA-RNTI, the 2-step RA of non-redcap terminals can use the above formula (2), and for the 4-step RA of redcap terminals, the following formula (3) is designed, and for the 2-step RA of redcap terminals, the following formula (4) is designed:

[0072] RA-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id + Nsymbol * Nslot * Nf * ul_carrier_id + offset_2 (offset_2) Formula (3)

[0073] MsgB-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id + Nsymbol * Nslot * Nf * ul_carrier_id + offset_3 (offset_3) Formula (4)

[0074] Among them, offset_2 (offset_2) and offset_3 (offset_3) can be set as integers greater than 0. The offsets in Formulas (2)-(4) can be pre-configured, and these offsets can be used to isolate the RA-RNTI and MsgB-RNTI assigned to different types of terminals. For example, Figure 3cAs shown, different RNTIs are allocated for RAs initiated by different types of terminals. RNTIs with a value range of [0, 17920] are allocated to the 4-step RAs of non-redcap terminals, RNTIs with a value range of [17921, 35840] are allocated to the 2-step RAs of non-redcap terminals, RNTIs with a value range of [35841, 53760] are allocated to the 4-step RAs of redcap terminals, and RNTIs with a value range of [53761, 71680] are allocated to the 2-step RAs of redcap terminals.

[0075] It should be understood that for the parameters involved in formulas (3) and (4): s_id, t_id, f_id, ul_carrier_id, Nsymbol, Nslot, Nf, the relevant descriptions can refer to the above text and will not be elaborated here. In addition, for the convenience of description, formulas (1) and (2) can be collectively referred to as the calculation formulas corresponding to the second type of terminals, and the second type of terminals can include non-redcap terminals. Formulas (3) and (4) can be collectively referred to as the calculation formulas corresponding to the first type of terminals, and the first type of terminals includes redcap terminals.

[0076] For example, as Figure 4aAs shown in the figure, the system bandwidth includes the initial bandwidth part (bandwidth part, BWP) of the redcap terminal and the initial BWP of non-redcap terminals. In the initial BWP of non-redcap terminals, RO resources for non-redcap terminals are allocated: RO e to RO l, and in the initial BWP of redcap terminals, RO resources configured for redcap terminals are: RO a to RO d. Assume that the non-redcap terminal sends Msg1 on RO e, the redcap terminal sends Msg1 on RO a, s_id = 10, t_id = 40, and ul_carrier_id = 0. Although whether it is a redcap terminal or a non-redcap terminal that sends Msg1 on different ROs, for non-redcap terminals and redcap terminals, since the index value f_id of the frequency domain unit starts from 0, the f_id corresponding to RO e and RO a is 0. That is, for redcap and non-redcap terminals, the parameters s_id, t_id, f_id, and ul_carrier_id used to calculate the RA-RNTI are the same. At this time, using formula (1), the RA-RNTI of the non-redcap terminal is obtained as 1 + s_id + 14×t_id + 14×80×f_id + 14×80×8×ul_carrier_id = 1 + 10 + 14×40 + 14×80×0 + 14×80×8×0 = 571. Assume that the offset _2 = 35840, and using formula (3), the RA-RNTI of the redcap terminal is obtained as 1 + s_id + 14×t_id + 14×80×f_id + 14×80×8×ul_carrier_id + offset _2 = 1 + 10 + 14×40 + 14×80×0 + 14×80×8×0 + 35840 = 36411. In this way, although the parameters s_id, t_id, f_id, and ul_carrier_id are the same, due to the use of different calculation formulas, the RA-RNTIs of the redcap terminal and the non-redcap terminal are different, and two DCIs are scrambled using different RA-RNTIs, and these two DCIs are used to schedule the RARs of the redcap terminal and the non-redcap terminal respectively.

[0077] For another example, as Figure 4b shown, in order to improve the utilization rate of RO resources, the access network device configures the redcap terminal and the non-redcap terminal to share RACH resources (which can be simply referred to as shared RO in this application), that is, the same RO / shared RO is configured for the redcap terminal and the non-redcap terminal (as Figure 4bRO resources shown in the figure: RO a to RO d). Non-RedCap terminals and RedCap terminals can send Msg1 on the same RO. For example, send Msg1 on RO a. At this time, although the values of the parameters s_id, t_id, f_id, and ul_carrier_id of non-RedCap terminals and RedCap terminals are the same, the RA-RNTI of non-RedCap terminals can be obtained using formula (1), and the RA-RNTI of RedCap terminals can be obtained using formula (3), so that the RA-RNTIs of RedCap terminals and non-RedCap terminals are different. Two DCIs are scrambled using different RA-RNTIs, and these two DCIs are used to schedule the RARs of RedCap terminals and non-RedCap terminals respectively.

[0078] As can be seen from the above, different RNTI calculation formulas can be designed for different types of terminals by introducing a bias, distinguishing the RNTIs used by different types of terminals to initiate RA, ensuring that the values of the RNTIs calculated by different types of terminals are different, enabling the network side to send the DCI of the terminal according to the RNTI of different terminals, and the terminal side can distinguish which type of terminal the DCI sent by the network side corresponds to and which type of RA initiated by the terminal through the RNTI, so that the terminal can obtain its own RAR according to its own DCI, avoiding random access conflicts between different terminals initiating different RAs.

[0079] Although different RNTI calculation formulas can be designed to ensure that the RNTIs of different types of terminals are different, and then the DCI sent by the network side can be distinguished by the RNTI. However, from the perspective of signaling overhead, in the scenario where multiple terminals share random access resources, if different DCIs are scrambled using different RNTIs and different RARs are scheduled using different DCIs, the signaling overhead will increase. For example, Figure 4b taking as an example, RedCap terminals and non-RedCap terminals share RO. After the access network device receives Msg1 sent by RedCap terminals and non-RedCap terminals on the shared RO, the access network device calculates two different RA-RNTIs using formula (1) and formula (3), and two DCIs are scrambled using these two different RA-RNTIs. These two DCIs can be used to schedule two PDSCHs. One PDSCH carries the RAR of the RedCap terminal, and the other PDSCH carries the RAR of the non-RedCap terminal, that is, the RARs of RedCap terminals and non-RedCap terminals are scheduled using two DCIs respectively, increasing the signaling overhead.

[0080] To solve the above problems, an embodiment of the present application provides a random access method, which may include: a first terminal sends a first message to an access network device on a first random access resource, the access network device receives the first message and sends a first DCI for scheduling a response message corresponding to the first message to the first terminal; the RNTI used to scramble the first DCI is calculated according to the parameters of the first random access resource and a bias, and the bias is indicated to the first terminal through first information. That is, the terminal is instructed to calculate its own RNTI according to the parameters of the random access resource and the bias, and use the calculated RNTI to descramble the received DCI, and then receive its own response message according to the indication of the successfully descrambled DCI. That is, it is not limited to calculating the RNTI according to the parameters of the random access resource, but on this basis, a bias is combined to calculate the RNTI. The design method is different from the existing method, so that the terminal can calculate the RNTI according to the existing method or combine the bias to calculate the RNTI when the first information indicates the bias, and the calculation method is flexible and diverse. In addition, in some scenarios, the RNTIs calculated by different types of terminals can be the same, and the RARs of different types of terminals are scheduled through the same DCI, saving signaling overhead.

[0081] The following describes the random access method provided by the embodiment of the present application with reference to the accompanying drawings of the specification.

[0082] The random access method provided by the embodiment of the present application can be used in any of the fourth generation (4G) system, long term evolution (LTE) system, fifth generation (5G) system, new radio (NR) system, NR-vehicle to everything (V2X) system, and Internet of Things system, and can also be applicable to other next-generation communication systems, etc., without limitation. The following uses Figure 5 the shown communication system as an example to describe the random access method provided by the embodiment of the present application.

[0083] Figure 5 is a schematic diagram of a communication system provided by the embodiment of the present application. As Figure 5 shown, the communication system may include an access network device and multiple terminals, such as: terminal 1, terminal 2. In Figure 5 the shown system, the terminal may be in an idle state or an inactive state. It should be noted that Figure 5 is an exemplary framework diagram, Figure 5 the number of nodes included in it is not limited, and in addition to Figure 5 the shown functional nodes, other nodes may also be included, such as: core network devices, gateway devices, application servers, etc., without limitation.

[0084] Among them, the access network device is mainly used to implement functions such as resource scheduling of terminals, radio resource management, and radio access control. Specifically, the access network device can be any one of a small base station, a wireless access point, a transmission receive point (TRP), a transmission point (TP), and some other access nodes.

[0085] The terminal can be a terminal device, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc. Specifically, the terminal can be a mobile phone, a tablet computer, or a computer with wireless transceiver functions. It can also be a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in remote medical treatment, a wireless terminal in smart grid, a wireless terminal in smart city, a smart home, a vehicle-mounted terminal, etc. In the embodiments of the present application, the device for implementing the functions of the terminal can be the terminal or a device capable of supporting the terminal to implement the functions, such as a chip system (for example, a single chip or a processing system composed of multiple chips). Hereinafter, taking the device for implementing the functions of the terminal as the terminal as an example, the random access method provided by the embodiments of the present application will be described.

[0086] In specific implementation, Figure 5 each of the network elements shown, such as: the terminal and the access network device, may adopt Figure 6 the shown composition structure or include Figure 6 the shown components. Figure 6 FIG. is a schematic diagram of the composition of a communication device 600 provided by the embodiments of the present application. When the communication device 600 has the functions of the terminal described in the embodiments of the present application, the communication device 600 can be a terminal or a chip or a system-on-chip in the terminal. When the communication device 600 has the functions of the access network device described in the embodiments of the present application, the communication device 600 can be an access network device or a chip or a system-on-chip in the access network device.

[0087] As Figure 6 shown, the communication device 600 may include a processor 601, a communication line 602, and a communication interface 603. Further, the communication device 600 may also include a memory 604. Among them, the processor 601, the memory 604, and the communication interface 603 may be connected through the communication line 602.

[0088] Among them, the processor 601 may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 601 may also be other devices with processing functions, such as circuits, devices, or software modules.

[0089] The communication line 602 is used to transmit information between the components included in the communication device 600.

[0090] The communication interface 603 is used to communicate with other devices or other communication networks. The other communication network may be an Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc. The communication interface 603 may be a radio frequency module, a transceiver, or any device capable of implementing communication. In this embodiment of the application, the communication interface 603 is taken as an example of a radio frequency module. Among them, the radio frequency module may include an antenna, a radio frequency circuit, etc., and the radio frequency circuit may include a radio frequency integrated chip, a power amplifier, etc.

[0091] The memory 604 is used to store instructions. Among them, the instructions may be computer programs.

[0092] Among them, the memory 604 may be a read-only memory (ROM) or other types of static storage devices that can store static information and / or instructions, may also be a random access memory (RAM) or other types of dynamic storage devices that can store information and / or instructions, and may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, optical disc storage, magnetic disk storage media, or other magnetic storage devices. Optical disc storage includes compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.

[0093] It should be noted that the memory 604 can exist independently of the processor 601 or be integrated with the processor 601. The memory 604 can be used to store instructions, program codes, or some data, etc. The memory 604 can be located inside the communication device 600 or outside the communication device 600, without limitation. The processor 601 is used to execute the instructions stored in the memory 604 to implement the random access method provided in the following embodiments of the present application.

[0094] In one example, the processor 601 may include one or more CPUs, such as Figure 6 the CPU0 and CPU1 in

[0095] As an alternative implementation, the communication device 600 includes multiple processors. For example, in addition to Figure 6 the processor 601 in

[0096] As an alternative implementation, the communication device 600 may further include an output device 605 and an input device 606. The input device 606 can be a keyboard, mouse, microphone, or joystick, etc., and the output device 605 can be a display screen, speaker, etc.

[0097] It should be noted that the communication device 600 can be a desktop computer, a laptop, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device with a Figure 6 similar structure in Figure 6 In addition, the shown component structure in Figure 6 does not constitute a limitation on the communication device. Except for

[0098] In the embodiments of the present application, the chip system can be composed of chips or can include chips and other discrete devices.

[0099] Next, in combination with Figure 5 the shown communication system, taking the random access resource as RO as an example, the random access method provided in the embodiments of the present application will be described. Among them, each device in the following embodiments can have Figure 6 the shown components, and the actions, terms, etc. involved in each embodiment can be referred to each other. The message names or parameter names in the messages for the interaction between devices in each embodiment are only examples, and other names can also be adopted in specific implementations, without limitation. In addition, the terms "first" and "second" in the embodiments of the present application are used to distinguish different objects, rather than to describe the specific order of the objects. The embodiments of the present application do not limit the attributes of the different objects represented by "first" and "second".

[0100] Figure 7 This is a flowchart of a random access method provided by an embodiment of the present application. As Figure 7 shown, the method may include:

[0101] Step 701: The first terminal sends a first message to the access network device on the first RO. Correspondingly, the access network device receives the first message from the first terminal.

[0102] Among them, the first terminal may be Figure 5 any terminal in, for example, the first terminal may be Figure 5 terminal 1 or terminal 2 in. The first terminal may be in a non-connected state (such as an idle state or a non-active state). The access network device may be Figure 5 the access network device in, and the access network device may provide network services for the first terminal.

[0103] Among them, the first RO may be an RO randomly selected by the first terminal for sending Msg1 or MsgB. The first message may carry a preamble. The first message may be Msg1. Or the first message may be MsgA. In addition to carrying the preamble, MsgA may further include a physical uplink shared channel (PUSCH) associated with the preamble, and the PUSCH may include uplink data and / or other information.

[0104] In an embodiment of the present application, the first terminal belongs to the first type of terminal, and the first RO may be included in the random access resources shared by the first type of terminal and the second type of terminal. Exemplarily, the first type of terminal includes a redcap terminal, and the second type of terminal includes a non-redcap terminal; or, the first type of terminal includes a terminal supporting coverage enhancement, and the second type of terminal includes a terminal not supporting coverage enhancement; or, the first type of terminal includes a terminal supporting access network slicing, and the second type of terminal includes a terminal not supporting access network slicing. The second type of terminal may be referred to as a normal terminal or a legacy terminal.

[0105] In an embodiment of the present application, the random access resources shared by the first type of terminal and the second type of terminal may be understood as shared random access resources. The shared random access resources may be jointly used by the first type of terminal and the second type of terminal. For example, as Figure 4b shown, RO a to RO d are shared random access resources and may be shared by redcap terminals and non-redcap terminals.

[0106] In the embodiments of the present application, the RedCap terminal can support a bandwidth of 20 megahertz (MHz), 1 receive antenna (RX) or 2 receive antennas (RX). Non-RedCap terminals can support a bandwidth of 100 MHz, 4 receive antennas (4RX), etc. When performing a random access procedure, the access network device can configure dedicated RACH resources (such as dedicated ROs, etc.) for non-RedCap terminals. The non-RedCap terminal can send Msg1 or MsgA on the RACH resources configured by the access network device corresponding to the RedCap terminal. The access network device can receive Msg1 or MsgA on this RACH resource and can learn that the terminal is a non-RedCap terminal based on the RACH resource.

[0107] In the embodiments of the present application, coverage enhancement can refer to increasing the coverage range through methods such as repeated transmission. Taking the physical uplink shared channel (PUSCH) as an example, a terminal supporting coverage enhancement capabilities can repeatedly transmit the PUSCH multiple times at once. When the access network device receives the signal, it can combine and receive multiple repeated PUSCHs to increase the equivalent signal-to-noise ratio of the signal, so that the access network device can receive signals from terminals farther away. If the terminal needs to use coverage enhancement technologies such as repeated transmission when sending Msg3 or MsgA during the random access procedure, the access network device can configure dedicated RACH resources (such as dedicated ROs, etc.) for the "coverage enhancement" of this terminal. After the terminal selects the RACH resource associated with coverage enhancement, it can send Msg1 or MsgA on the selected RACH resource. Correspondingly, the access network device can receive Msg1 or MsgA on this RACH resource. For 4-step RA, the access network device can learn that the terminal hopes to use coverage enhancement technology to send Msg3 based on the RACH resource selected by the terminal, and subsequent transmissions of Msg3 can be scheduled in a coverage enhancement manner. For 2-step RA, the RACH resources corresponding to "coverage enhancement" include dedicated RO / preambles and PUSCHs configured in a coverage enhancement manner (such as repeated transmission, etc.). When the terminal sends MsgA, it will send the RO / preamble corresponding to "coverage enhancement" and the repeatedly transmitted PUSCH.

[0108] In the embodiments of the present application, a terminal supporting access network slicing can obtain / be allocated better and more sufficient radio resources, while a terminal not supporting access network slicing may obtain / be allocated poorer radio resources. When performing a random access procedure, the access network device can configure dedicated RACH resources (such as dedicated ROs, etc.) for a terminal supporting access network slicing. The terminal supporting access network slicing can send Msg1 or MsgA on the RACH resources configured by the access network device. Correspondingly, the access network device can receive Msg1 or MsgA on the RACH resources, and can learn from the RACH resources that the terminal is a terminal supporting access network slicing.

[0109] It should be understood that the first type of terminal and the second type of terminal introduced in the embodiments of the present application are for more clearly explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation to the technical solutions provided by the embodiments of the present application. In addition to the above types of terminals, other types of terminals may also be included. For example, as known to those of ordinary skill in the art, with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present application can still use the DCI that scrambles the response message corresponding to Msg1 with the RA-RNTI obtained according to the above formula (1) for Msg1 initiated by other new types of terminals, or can also obtain the RA-RNTI according to a new calculation formula obtained by increasing the offset, and use the obtained RA-RNTI to scramble the DCI of the response message corresponding to Msg1. It can be understood that with the evolution of the network architecture and the emergence of new service scenarios, a terminal supporting one or more new capabilities (functions or features) that appears can be understood as the first type of terminal in the embodiments of the present application, while an existing terminal not supporting the new capabilities can be understood as the second type of terminal in the embodiments of the present application.

[0110] Step 702: The access network device sends a first DCI to the first terminal according to the first message. Correspondingly, the first terminal receives the first DCI from the access network device.

[0111] Further optionally, the access network device sends a response message corresponding to the first message at the time-frequency resource position indicated by the first DCI. Correspondingly, the first terminal determines the RNTI according to the first RO, descrambles the first DCI according to the RNTI, and after the first DCI is successfully descrambled, receives the response message corresponding to the first message at the time-frequency resource position indicated by the first DCI. When the first message is Msg1, the response message corresponding to the first message may be Msg2. When the first message is MsgA, the response message corresponding to the first message may be MsgB.

[0112] Further optionally, if the response message corresponding to the first message is Msg2, the method further includes: the first terminal sends Msg3 carrying uplink data to the access network device, and the access network device receives Msg3 and sends Msg4 to the first terminal.

[0113] Among them, the first DCI can be used to schedule the response message corresponding to the first message. The first DCI can indicate the time-frequency resource location of the response message corresponding to the first message. The first DCI is scrambled with an RNTI, and there is an association relationship between the RNTI and the first RO. It should be understood that when the first message is Msg1, the RNTI scrambling the first DCI can be RA-RNTI. When the first message is MsgA, the RNTI scrambling the first DCI can be MsgB-RNTI.

[0114] In the embodiments of the present application, the RNTI scrambling the first DCI of the first terminal can be calculated according to formula (1) / formula (2), or can be calculated according to formula (3) / formula (4). For example, in the scenario where the first type of terminal and the second type of terminal share the RO, if the access network device hopes that the first type of terminal and the second type of terminal share the DCI scrambled with the same RNTI and share the RAR scheduled by the same DCI, it does not send an indication to the first terminal, and by default, the first terminal calculates the RNTI according to formula (1) / formula (2), or the access network device can indicate that the first terminal calculates the RNTI using the calculation formula corresponding to the second type of terminal (such as formula (1) / formula (2)). If the access network device hopes that the first type of terminal and the second type of terminal respectively use different DCIs to schedule the RAR and does not want the first type of terminal and the second type of terminal to share the DCI scrambled with the same RNTI, it indicates that the first terminal calculates the RNTI using the calculation formula corresponding to the first type of terminal (formula (3) / formula (4)).

[0115] It should be understood that the calculation formula corresponding to the second type of terminal described in this application may refer to the RNTI calculation formula default or pre-configured for the second type of terminal. Instructing the first terminal to calculate the RNTI using the calculation formula corresponding to the second type of terminal (such as formula (1) / formula (2)) may include: when the first message is Msg1, instructing the first terminal to calculate the RA-RNTI using formula (1) described above. When the first message is MsgB, instructing the first terminal to calculate the MsgB-RNTI using formula (2) described above. In this way, the first type of terminal and the second type of terminal can use the same RNTI calculation formula, for example, both use formula (1) or formula (2) to calculate the RNTI corresponding to the RA method, ensuring that when the first type of terminal and the second type of terminal share random access resources, or the parameters of the random access resources for the first type of terminal and the second type of terminal to send preambles are the same, the RNTIs calculated by the first type of terminal and the second type of terminal are the same, and the DCI scrambled with this RNTI is also the same, which is the same DCI. This DCI can be used to schedule the RARs of the first type of terminal and the second type of terminal, that is, carrying the RARs of these multiple types of terminals in the same PDSCH scheduled by the same DCI, realizing the sharing of DCI and RAR of multiple types of terminals and reducing signaling overhead.

[0116] Take Figure 4b as an example. Assume that both non-redcap terminals and redcap terminals send preambles in RO a. Assume s_id = 10, t_id = 40, and ul_carrier_id = 0. For non-redcap terminals and redcap terminals, f_id = 0. After the access network device receives Msg1 sent by redcap terminals and non-redcap terminals on the shared RO, if the access network device hopes to feedback the RARs of both types of terminals using the same DCI scheduling, the access network device uses formula (1) to calculate the RA-RNTI of both types of terminals = 1 + s_id + 14×t_id + 14×80×f_id + 14×80×8×ul_carrier_id = 1 + 10 + 14×40 + 14×80

[0117] ×0 + 14×80×8×0 = 571, the same RA-RNTI is obtained. Using this RA-RNTI to scramble a DCI, this DCI can schedule a PDSCH, and this PDSCH can carry the RAR of the redcap terminal and the RAR of the non-redcap terminal, that is, one DCI can schedule the RAR of the redcap terminal and the non-redcap terminal, reducing the signaling overhead. At the same time, the access network device instructs the redcap terminal to calculate the RA-RNTI using formula (1), or the redcap terminal defaults to using formula (1) to calculate the RA-RNTI, and receives the DCI according to the calculated RA-RNTI. If the access network device hopes to feedback the RARs scheduled by different DCIs for the two types of terminals, it instructs the redcap terminal to calculate the RA-RNTI = 1 + s_id + 14×t_id + 14×80×f_id + 14×80×8×ul_carrier_id + M = 1 + 10 + 14×40 + 14×80×0 + 14×80×8×0 + 35840 = 36411 using formula (3), M = 35840. In this way, the RA-RNTI calculated by the redcap terminal is different from the RA-RNTI calculated by the non-redcap terminal. Therefore, the two types of terminals receive different DCIs, and the RARs scheduled by two different DCIs are used for the feedback of Msg2.

[0118] Furthermore, in order to distinguish which RAR among the RARs scheduled by the same DCI is for the first type of terminal and which is for the non-redcap terminal. In a possible design, it is possible to distinguish which RAR is sent to which terminal by allocating preambles for different types of terminals. For example, different preambles are pre-allocated for the first type of terminal (such as the redcap terminal) and the second type of terminal (such as the non-redcap terminal). One preamble corresponds to one number, and the number of the preamble can be understood as the identifier of the preamble (random access preamble identifier, RAPID) (which can be abbreviated as RPID). The identifier of the preamble can be used to identify the preamble, and the terminal distinguishes whether it is its own RAR through the field in the RAR corresponding to the preamble.

[0119] For example, taking the response message as the MAC RAR, the format of the MAC RAR corresponding to Msg1 initiated by multiple terminals is as Figure 8 shown. It can be seen that the MAC RAR can include RARs for multiple terminals, such as Figure 8The MAC payload contains n MAC RARs, where n is an integer greater than or equal to 1. To distinguish which terminal each RAR belongs to, a field "RPID" is included in the MAC subheader of each RAR, and this field corresponds to the number of the preamble. For example, when a terminal sends Msg1 and uses the preamble numbered 5, after the terminal receives the PDSCH carrying the MAC RAR in the format shown in Figure 8 it can check the RPID field in each RAR in the MAC RAR. If the RPID field of a RAR is the same as the number 5 of the preamble it sent, it means this RAR may be sent to itself.

[0120] The following describes the process of the access network device instructing the first terminal to calculate the RNTI using the calculation formula corresponding to the second type of terminal (such as formula (1) / formula (2)):

[0121] (1.1) Directly instruct the first terminal to calculate the RNTI using the calculation formula corresponding to the second type of terminal. For example, when the access network device hopes that the first type of terminal and the second type of terminal share the DCI scrambled with the same RNTI and the RAR scheduled by the same DCI, the access network device can send information a to the first terminal, and this information a instructs the first terminal to use the calculation formula corresponding to the second type of terminal (formula (1) or formula (2)) to calculate the RNTI.

[0122] Among them, the information a can be carried in the high-layer signaling, such as in the radio resource control (RRC) message, and can also be carried in the media access control control element (MAC CE). The information a instructing the first terminal to calculate the RNTI using the calculation formula corresponding to the second type of terminal can include the following several ways:

[0123] In a possible design, the information a includes the index of the calculation formula corresponding to the second type of terminal, that is, directly uses the calculation formula corresponding to the second type of terminal.

[0124] For example, the index corresponding to formula (1) is 1, the index corresponding to formula (2) is 2, the index corresponding to formula (3) is 3, and the index corresponding to formula (4) is 4. When the first message is Msg1, if information a carries the index 1 corresponding to formula (1), it indicates that the first terminal uses formula (1) to calculate RA-RNTI; if information a carries the index 3, it indicates that formula (3) is used to calculate RA-RNTI. When the first message is Msg2, if information a carries the index 2 corresponding to formula (2), it indicates that the first terminal uses formula (2) to calculate MsgB-RNTI; if information a carries the index 4, it indicates that formula (4) is used to calculate MsgB-RNTI.

[0125] In another possible design method, information a includes the RO configuration information of the first type of terminal, and the value of the RO parameter included in the RO configuration information indicates that the first terminal uses the calculation formula corresponding to the second type of terminal to calculate RNTI.

[0126] Among them, the RO configuration information may include RO parameters such as the starting frequency domain position of the RO resource, the frequency division multiplexing coefficient of the RO, the time domain position of the RO, etc., and may also include the correspondence between the RO and the SSB (such as the number of SSBs corresponding to one RO (SSB per RO)), the bandwidth of one RO, etc. The starting frequency domain position of the RO resource may refer to the offset between the starting RO (which can be called the starting RO) with the lowest frequency in the RO resource and the starting frequency of the initial BWP of this type of terminal. The frequency division multiplexing coefficient of the RO may refer to the number of ROs configured on different frequency domain units corresponding to the same time unit (such as a slot). The time domain position of the RO may refer to the time resource position occupied by the RO within a transmission period.

[0127] For example, when the frequency division multiplexing coefficient of the RO is a preset value, such as 4, it indicates that the first terminal uses the calculation formula corresponding to the second type of terminal to calculate RNTI. When the frequency division multiplexing coefficient of the RO is other values, it indicates that the first terminal does not use the calculation formula corresponding to the second type of terminal to calculate RNTI, and uses formula (3) / formula (4) to calculate RNTI.

[0128] In yet another possible design, information a includes the BWP configuration information of the first type of terminal, and the value of the BWP parameter included in the BWP configuration information indicates that the first terminal uses the calculation formula corresponding to the second type of terminal to calculate RNTI.

[0129] Among them, the BWP configuration information may include BWP parameters such as the bandwidth size of the initial BWP and the starting frequency-domain position, and may also include the subcarrier spacing (SCS) of the initial BWP (which can be abbreviated as BWP SCS). The starting frequency-domain position may refer to the offset of the starting frequency domain of the initial BWP (or the frequency-domain unit with the lowest frequency) from the starting frequency domain of the system bandwidth, and this offset may be an integer greater than or equal to 0. Among them, the starting frequency domain of the system bandwidth may refer to the frequency-domain unit with the lowest frequency in the system bandwidth. Optionally, the starting frequency domain of the system bandwidth is the frequency-domain unit numbered 0, and the starting frequency-domain position of the system bandwidth is 0 PRB.

[0130] For example, when the starting frequency-domain position in the BWP configuration information is 0 PRB, that is, when the starting frequency domain of the initial BWP is the same as the starting frequency-domain position of the system bandwidth, it is indicated that the first terminal calculates the RNTI using the calculation formula corresponding to the second type of terminal. When the starting frequency-domain position in the BWP configuration information is other values, it is indicated that the first terminal does not calculate the RNTI using the calculation formula corresponding to the second type of terminal, and by default, the RNTI is calculated using formula (3) / formula (4).

[0131] It should be understood that in the embodiments of this application, the initial BWP and RO resources are configured granularity by terminal type. For the first terminal belonging to the first type of terminal, its BWP configuration information and RO configuration information correspond to the first type of terminal, and the BWP configuration information and RO configuration information can be sent to the first terminal through the system message corresponding to the first type of terminal. For example, before executing S701, the access network device may send a system message to the first terminal, and this system message may carry the BWP configuration information of the first type of terminal and the RO configuration information of the RO resources allocated for the first type of terminal to use. Optionally, the RO configuration information may be carried in the BWP configuration information.

[0132] In another possible design, the first random access resource is included in the shared RO, and the shared RO corresponds to the calculation formula (formula (1) / formula (2)) of the second type of terminal. At this time, the information a may include indication information indicating the shared RO.

[0133] In one example, binary bits may be used to indicate that all RO resources of the first terminal are shared ROs or all RO resources are non-shared ROs. For example, the binary bit "1" may be used to indicate that all RO resources of the first terminal are shared ROs, and the binary bit "0" may be used to indicate that all RO resources of the first terminal are non-shared ROs. When the binary bit "1" is carried in the information a, it is indicated that all RO resources of the first terminal are shared ROs, and when the first terminal initiates RA on all these RO resources, the RNTI is calculated using the calculation formula (formula (1) / formula (2)) corresponding to the second type of terminal.

[0134] In another example, the RO resource of the first terminal corresponds to a mask, which can be referred to as an RO mask. The mask includes S bits, where S is equal to the frequency division multiplexing coefficient of the first terminal. That is, the mask can be a bitmap. One bit included in the mask corresponds to one RO of the first terminal, and this bit is used to indicate whether the RO corresponding to it is a shared RO. The value of this bit can be "1" or "0".

[0135] Taking "1" indicating that the RO is a shared RO and "0" indicating that the RO is a non-shared RO as an example, for example, the frequency reuse coefficient of the first terminal is 4, that is, it includes 4 ROs. At this time, information a can include a mask: 0011, where the first bit corresponds to the RO with the lowest frequency, the second bit corresponds to the RO with the second lowest frequency, and so on. In this way, the mask 0011 represents that the two ROs with lower frequency domain numbers are not shared, and the RNTI is calculated using formula (3) / formula (4), while the two ROs with higher frequency domain numbers are shared, and the RNTI is calculated using formula (1) / formula (2).

[0136] It should be understood that the message names or parameter names in the messages in the embodiments of the present application are only examples, and other names can also be used in specific implementations without limitation. For example, information a can also be described as the first information, the second information, and so on.

[0137] (1.2) The bias in the calculation formula corresponding to the first type of terminal is indicated to the first terminal through information b (such as the bias_2 in formula 3 or the bias_3 in formula 4), and this bias is zero. That is, it is default or pre-configured that the first type of terminal uses formula (3) or formula (4) to calculate the RNTI. However, for the bias in formula (3) or formula (4), instead of using a default or pre-configured integer greater than 1, it is indicated that this bias is zero, which is equivalent to calculating the RNTI using formula (1) or formula (2).

[0138] It should be understood that the calculation formula corresponding to the first type of terminal described in the present application can refer to the RNTI calculation formula (formula (3) or formula (4)) that is default or pre-configured for the first type of terminal. For example, for the 4-step RA of the first type of terminal, the calculation formula default or pre-configured for the first type of terminal is formula (3). For the 2-step RA of the second type of terminal, the calculation formula default or pre-configured for the first type of terminal is formula (4).

[0139] Among them, information b can be carried in high-layer signaling, such as RRC messages, and can also be carried in MAC CE. There are several ways for information b to indicate that the bias is zero:

[0140] In a possible design, information b includes the bias, that is, directly indicates the value of the bias.

[0141] In another possible design method, information b includes the RO configuration information of the first type of terminal, and the value of the RO parameter included in the RO configuration information indicates that the offset is zero. For example, when the value of the RO parameter included in the RO configuration information is the first value, it indicates that the offset is zero.

[0142] The first value can be pre-configured without limitation. As described above, the RO configuration information may include RO parameters such as the starting frequency domain position of the RO resource, the frequency division multiplexing coefficient of the RO, and the time domain position of the RO. Exemplarily, when the frequency division multiplexing coefficient of the RO is a preset value, such as 4, it indicates that the offset is zero. When the frequency division multiplexing coefficient of the RO is other values, it indicates that the offset is other numerical values, such as a default / pre-configured integer greater than 1.

[0143] In yet another possible design, information b includes the BWP configuration information of the first type of terminal, and the value of the BWP parameter included in the BWP configuration information indicates that the offset is zero. For example, when the value of the BWP parameter included in the BWP configuration information is the second value, it indicates that the offset is zero.

[0144] The second value can be pre-configured without limitation. As described above, the BWP configuration information may include BWP parameters such as the bandwidth size of the initial BWP and the starting frequency domain position. Exemplarily, when the starting frequency domain position in the BWP configuration information is 0 PRB, that is, when the starting frequency domain of the initial BWP is the same as the starting frequency domain position of the system bandwidth, it indicates that the offset is zero. When the starting frequency domain position in the BWP configuration information is other values than 0 PRB, it indicates that the offset is other numerical values, such as a default / pre-configured integer greater than 1.

[0145] In yet another possible design, the first RO is included in the shared RO, the shared RO corresponds to an offset of zero, and information b includes indication information indicating the shared RO.

[0146] In one example, binary bits can be used to indicate that all RO resources of the first terminal are shared ROs or all RO resources are non-shared ROs. For example, binary bit "1" can be used to indicate that all RO resources of the first terminal are shared ROs, and binary bit "0" can be used to indicate that all RO resources of the first terminal are non-shared ROs. When binary bit "1" is carried in information b, it indicates that all RO resources of the first terminal are shared ROs, and when the first terminal initiates RA on all these RO resources, the offset used for calculating the RNTI is zero.

[0147] In another example, the RO resource of the first terminal corresponds to a mask, which can be referred to as the RO mask. The mask includes S bits, where S is equal to the frequency division multiplexing coefficient of the first terminal. That is, the mask can be a bitmap. One bit included in the mask corresponds to one RO of the first terminal, and this bit is used to indicate whether the RO corresponding to it is a shared RO. The value of this bit can be "1" or "0".

[0148] Taking "1" indicating that the RO is a shared RO and "0" indicating that the RO is a non-shared RO as an example, for example, the frequency reuse coefficient of the first terminal is 4, that is, it includes 4 ROs. At this time, the information b can include a mask 0011, where the first bit corresponds to the RO with the lowest frequency, the second bit corresponds to the RO with the second lowest frequency, and so on. In this way, the mask 0011 represents that the two ROs with lower frequency domain numbers are not shared, and a bias greater than 1 by default / pre-configuration is used to calculate the RNTI, while the two ROs with higher frequency domain numbers are shared, and the bias used when calculating the RNTI is zero.

[0149] It should be understood that the message names or parameter names in the messages in the embodiments of the present application are only examples, and other names can also be used in specific implementations, which are not limited. For example, the information b can also be described as the first information, the second information, and so on.

[0150] In a possible application scenario, there may be a situation where although the first type of terminal and the second type of terminal share the same RO, the parameters of the shared RO corresponding to the first type of terminal are different from the parameters of the shared RO corresponding to the second type of terminal. As a result, after the two types of terminals initiate random access on the shared RO, the RNTIs calculated according to the parameters of the shared RO and the same calculation formula are different, and it is impossible to implement DCI scheduling of the RARs of the two types of terminals based on the same RNTI scrambling.

[0151] Taking the first type of terminal as a redcap terminal and the second type of terminal as a non-redcap terminal as an example, for example, as Figure 9As shown in the figure, the access network device is respectively configured with the BWP of non-redcap terminals and the BWP of redcap terminals. The starting frequency domain position of the RO is configured as 12 PRBs in the system message of the BWP of non-redcap terminals, and the frequency division multiplexing factor is 8. The starting frequency domain position of the RO is configured as 5 PRBs (the redcap terminal only uses RO e to RO h) in the system message of the BWP of redcap terminals, and the frequency division multiplexing factor is 4. The non-redcap terminals occupy RO a to RO h, and the redcap terminals occupy RO e to RO h. The redcap terminals share the 4 ROs with higher frequencies in the non-redcap terminals: RO e to RO h. When the index value f_id of the RO is sequentially numbered starting from 0, the index values f_id of the 4 ROs shared by the redcap terminals, namely RO e to RO h, are [0, 3], and the index values of RO e to RO h occupied by the non-redcap terminals are [4, 7]. For these two types of terminals, the values of f_id corresponding to the same RO are different. For example, the RO e occupied by the redcap terminal corresponds to f_id = 0, and the f_id of the RO e occupied by the non-redcap terminal is 4. If the redcap terminal and the non-redcap terminal send Msg1 on RO e, even if both the non-redcap terminal and the redcap terminal calculate the RA-RNTI based on the formula (1) in the above manner, since the f_id of their RO e is different, the calculated RA-RNTI of the two is different, and it is impossible to realize that the redcap terminal and the non-redcap terminal use the same DCI-scheduled RAR for feedback.

[0152] To solve the problem that the RNTIs calculated by the first type of terminal and the second type of terminal based on the parameters of the shared RO are different, the embodiment of the present application provides a method: the access network device indicates the offset of the parameters of the first RO to the first terminal through information c. After receiving the information c, the first terminal calculates the RNTI according to the parameters of the first RO and the offset of the parameters of the first RO.

[0153] In the embodiments of the present application, the parameters of the first RO may at least include f_id, and may also include at least one of s_id, t_id, and ul_carrier_id. The relevant descriptions of s_id, t_id, f_id, and ul_carrier_id are as described above and will not be elaborated. The offset of the parameters of the first RO can be used to adjust the value (or the so-called initial value) of the first random access parameter, so that the adjusted value of the parameters of the first RO of the first terminal is the same / aligned with the value (or the so-called initial value) of the parameters of the first RO corresponding to the second type of terminal, ensuring that after the two initiate random access on the first RO, the RNTI calculated based on the same calculation formula is the same, and realizing the RAR for scheduling different types of terminals based on the same DCI.

[0154] In the embodiments of the present application, the value of the parameters of the first RO can be understood as the initial value of the parameters of the first RO. The adjusted value of the parameters of the first RO may refer to the value obtained by adjusting the initial value of the parameters of the RO using the offset of the parameters. Exemplarily, the adjusted value of the parameters of the first RO = the value of the parameters of the first RO + the offset of the parameters. It should be understood that the method for determining the adjusted value of the parameters described in the present application is only an exemplary illustration. Optionally, when the offset of the parameters is a negative number less than 0, the adjusted value of the parameters of the first RO = the value of the parameters of the first RO - the offset of the parameters, that is, any technical means that can achieve the same adjusted value of the parameters of the first RO of the first terminal as the value of the parameters of the first RO corresponding to the second type of terminal is within the protection scope of the present application.

[0155] For example, the value of s_id of the first RO is the index value of the symbol occupied by the first RO in a time slot, and the adjusted value of s_id of the first RO = the value of s_id of the first RO + the offset of s_id. The value of t_id of the first RO is the index value of the time slot occupied by the first RO in a system frame, and the adjusted value of t_id of the first RO = the value of t_id of the first RO + the offset of t_id. The value of f_id of the first RO is the index value of the frequency domain unit occupied by the first RO among Nf frequency domain units, and the adjusted value of f_id of the first RO = the value of f_id of the first RO + the offset of f_id. The value of ul_carrier_id of the first RO is the index value of the uplink carrier occupied by the first RO among Nc uplink carriers, and the adjusted value of ul_carrier_id of the first RO = the value of ul_carrier_id of the first RO + the offset of ul_carrier_id.

[0156] In the embodiments of the present application, calculating the RNTI by the first terminal according to the parameters of the first RO and the offset of the parameters of the first RO may include: obtaining the adjusted value of the parameters of the first RO by adding the offset to the value of the parameters of the first RO, and calculating the RNTI according to the adjusted value of the parameters of the first RO. For example, when the first message is Msg1, that is, when 4-step RA is initiated, the RA-RNTI is obtained based on formula (1) and the adjusted value of the parameters of the first RO. When the first message is MsgA, that is, when 2-step RA is initiated, the MsgB-RNTI is obtained based on formula (2) and the adjusted value of the parameters of the first RO.

[0157] Taking the time domain position of the RO shared by the first type of terminal and the second type of terminal being the same and the value of the frequency domain index f_id being different, and adjusting the value of f_id as an example, assuming the offset of the parameter is △, and △ is an integer greater than or equal to 0. When the first message is Msg1, that is, when 4-step RA is initiated, referring to the above formula (1), the RA-RNTI calculated by the first terminal according to the parameters of the first RO and the offset of the parameters of the first RO satisfies the following formula:

[0158] RA-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * (f_id + △) + Nsymbol * Nslot * Nf *

[0159] ul_carrier_id; the value ranges of s_id, t_id, f_id, and ul_carrier_id are the same as those in formula (1); or,

[0160] RA-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id’ + Nsymbol * Nslot * Nf * ul_carrier_id, f_id’ = f_id + △; the value ranges of s_id, t_id, f_id, and ul_carrier_id are the same as those in formula (1); or,

[0161] RA-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id’ + Nsymbol * Nslot * Nf * ul_carrier_id, the value ranges of s_id, t_id, and ul_carrier_id are the same as those in formula (1), the value range of f_id’ is [f_id + △, Nf - 1], and the value range of f_id is [0, Nf - 1].

[0162] Similarly, taking the case where the time-domain positions of the ROs shared by the first type of terminal and the second type of terminal are the same, but the values of the frequency-domain index f_id are different, and adjusting the value of f_id as an example, assuming that the bias of the parameter is Δ, where Δ is an integer greater than or equal to 0. When the first message is MsgA, that is, when initiating 2-step RA, referring to the above formula (2), the MsgB-RNTI calculated by the first terminal according to the parameters of the first RO and the bias of the parameters of the first RO satisfies the following formula:

[0163] MsgB-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * (f_id + Δ) + Nsymbol * Nslot * Nf *

[0164] ul_carrier_id + bias_1; the value ranges of s_id, t_id, f_id, ul_carrier_id, and bias_1 are the same as those in formula (2); or,

[0165] MsgB-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id’ + Nsymbol * Nslot * Nf * ul_carrier_id + bias_1, where f_id’ = f_id + Δ; the value ranges of s_id, t_id, f_id, ul_carrier_id, and bias_1 are the same as those in formula (2); or,

[0166] MsgB-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id’ + Nsymbol * Nslot * Nf * ul_carrier_id + bias_1, the value ranges of s_id, t_id, ul_carrier_id, and bias_1 are the same as those in formula (2), the value range of f_id’ is [f_id + Δ, Nf - 1], and the value range of f_id is [0, Nf - 1].

[0167] Take Figure 9For example, the RedCap terminal shares the 4 ROs with higher frequencies in the non-RedCap terminal: RO e to RO h. When the index value f_id of the RO is sequentially numbered starting from 0, the access network device can indicate to the RedCap terminal that the offset Δ of f_id is 4. At this time, the adjusted values of the index values f_id of the 4 ROs shared by the RedCap terminal are [4, 7], which are the same as the index values [4, 7] of RO e to RO h occupied by the non-RedCap terminal. If the RedCap terminal and the non-RedCap terminal send Msg1 on ROe, the RA-RNTI calculated by the RedCap terminal based on RA-RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * (f_id + △) + Nsymbol * Nslot * Nf * ul_carrier_id is the same as the RA-RNTI calculated by the non-RedCap terminal based on formula (1), which can enable the RedCap terminal and the non-RedCap terminal to use the RAR scheduled by the same DCI for feedback, saving signaling overhead.

[0168] It should be noted that the offset of f_id can be set to be greater than or equal to 0 and less than the maximum frequency division multiplexing coefficient Nf. For example, taking the offset of f_id as △, if Nf = 8, then 8 > △ ≥ 0. If Nf = 4, then 4 > △ ≥ 0.

[0169] Among them, the information c can be carried in the high-layer signaling, such as the RRC message, and can also be carried in the MAC CE, or can be carried in the RO configuration information of the first terminal. The way for the information c to indicate the offset of the parameters of the first RO can include any of the following possible design methods:

[0170] In a possible design method, the information c includes the offset of the parameters of the first RO, that is, directly indicates the numerical value of the offset of the parameters of the first RO.

[0171] In another possible design method, the information c includes the RO configuration information of the second type of terminal. The RO configuration information of the second type of terminal is used to indicate the RO time domain position, frequency division multiplexing coefficient, and starting frequency domain position of the second type of terminal. The first terminal obtains the RO configuration information of the second type of terminal from the information c, and the first terminal calculates the offset of the parameters according to the RO configuration information of the second type of terminal.

[0172] In one example, taking the parameter f_id as an example, the bias of the parameter f_id calculated by the first terminal according to the RO configuration information of the second type of terminal may include: calculating the bias of f_id according to the RO configuration information of the first type of terminal and the RO configuration information of the second type of terminal. For example, determining the frequency domain position of the RO allocated to the first type of terminal according to the RO configuration information of the first type of terminal, determining the frequency domain position of the RO allocated to the second type of terminal according to the RO configuration information of the second type of terminal, and determining the overlapping frequency domain position between the frequency domain position of the RO allocated to the first type of terminal and the frequency domain position of the RO allocated to the second type of terminal as the RO shared by the first type of terminal and the second type of terminal (which can be simply referred to as the shared RO), and obtaining the bias of f_id according to the frequency domain interval between the starting RO in the shared RO and the starting RO in the RO resources of the second type of terminal. For example, the bias of f_id = the frequency domain position of the starting RO of the second type of terminal minus the frequency domain position of the starting RO in the shared RO. In this way, the bias of f_id can be determined according to the frequency domain position of the RO allocated to the second type of terminal and the frequency domain position of the RO allocated to the first type of terminal.

[0173] The RO configuration information of the first type of terminal may be carried in the system message and configured for the first terminal. Specifically, the relevant description of the RO configuration information of the first type of terminal is as described above and will not be elaborated here.

[0174] For example, taking Figure 9For example, the RO configuration information of non-RedCap terminals and RedCap terminals is shown in Table 1 below. The access network device configures an initial BWP with a bandwidth of 40 megahertz (MHz) (equivalent to 106 PRBs) for non-RedCap terminals, and an RO with a frequency division multiplexing coefficient of 8 is configured thereon. The starting RO of the non-RedCap terminal is located at 12 PRBs (the frequency domain position of the starting RO of the non-RedCap terminal relative to the starting RO of the initial BWP of the non-RedCap terminal). For RedCap terminals, the access network device configures an initial BWP with a bandwidth of 20 MHz (equivalent to 51 PRBs). The RO configuration information of the RedCap terminal includes a frequency division multiplexing coefficient = 8, and the starting RO is located at -43 PRBs (the frequency domain position of the starting RO among 8 ROs relative to the starting RO of the initial BWP of the RedCap terminal), which means that the 8 ROs are outside the initial BWP of the RedCap terminal. If it is stipulated that the RedCap terminal can only use the ROs within the initial BWP of the RedCap terminal, then the RedCap terminal can calculate according to Table 1 that only the 4 ROs with higher frequencies (RO e to RO h) are within the initial BWP of the RedCap terminal and can be used by the RedCap terminal. That is, the starting RO that the RedCap terminal can use corresponds to the 5th RO that the non-RedCap terminal can use, and the offset of f_id is set to 4.

[0175] Table 1

[0176]

[0177] In another example, taking the parameter f_id as an example, the offset of the parameter f_id calculated by the first terminal according to the RO configuration information of the second terminal may include: calculating the offset of f_id according to the BWP configuration information of the first terminal and the RO configuration information of the second terminal. For example, determine the frequency domain position of the RO allocated for the second terminal to use according to the RO configuration information of the second terminal, and determine the frequency domain position (or frequency domain range) of the initial BWP of the first terminal according to the BWP configuration information of the first terminal. If the frequency domain position of some ROs allocated for the second terminal to use is within the initial BWP of the first terminal, then determine these ROs as the ROs shared by the first terminal and the second terminal (which can be simply referred to as shared ROs), and obtain the offset of f_id according to the frequency domain interval between the starting RO in the shared ROs and the starting RO in the RO resources of the second terminal. For example, the offset of f_id = the frequency domain position of the starting RO of the second terminal minus the frequency domain position of the starting RO in the shared ROs. That is, determine the offset of f_id according to the frequency domain position of the RO allocated for the second terminal to use and the frequency domain position of the initial BWP allocated for the first terminal.

[0178] The BWP configuration information of the first type of terminal can be used to indicate the bandwidth size, starting frequency domain position, etc. of the initial BWP of the first type of terminal. The BWP configuration information of the first type of terminal can be configured for the first terminal in the system message. Specifically, the relevant description of the BWP configuration information of the first type of terminal is as described above and will not be elaborated.

[0179] For example, as Figure 9 shown, the message c may include the RO configuration information of non-redcap terminals: the frequency reuse factor of RO is 8, the starting frequency domain position is 12 PRB, the time domain position, etc. There are 8 ROs (RO a to RO h) at the same time domain position. Figure 9 In the case where the starting frequency domain position of the initial BWP of the redcap terminal is 55 PRB and the width of the initial BWP is 51 PRBs. At this time, the redcap terminal can calculate that RO a-d are not within the range of the initial BWP of the redcap terminal and cannot be used by the redcap terminal, while ROe-RO h are within the range of the initial BWP of the redcap terminal, and these ROs can be used or shared. Since the 4 ROs with lower frequencies cannot be used, only the 4 ROs with higher frequencies (RO e to RO h) can be used by the redcap terminal, that is, the starting RO that the redcap terminal can use corresponds to the 5th RO that the non-redcap terminal can use, so the offset of f_id is set to 4.

[0180] In another possible design, the first RO is included in the shared RO, and the information c includes the first indication information. Among them, the first indication information is used to indicate the RO set and the shared RO in the RO set. The first terminal can obtain the offset of f_id according to the frequency domain interval between the starting RO in the shared RO and the starting RO in the RO set.

[0181] Among them, the RO set can be a set of ROs allocated for the second type of terminal to use, and the RO set can include one or more ROs. The shared RO in the RO set can refer to the ROs allocated for the first type of terminal and the second type of terminal to use jointly.

[0182] In an example, the RO set corresponds to a mask, and this mask can be called an RO mask. This mask includes S bits, and S is equal to the frequency division multiplexing factor, that is, this mask can be a bitmap. One bit included in this mask corresponds to one RO in the RO set, and this bit is used to indicate whether the RO corresponding to it is shared, and the value of this bit can be "1" or "0".

[0183] Taking "1" indicating that the RO is a shared RO and "0" indicating that the RO is a non-shared RO as an example, as Figure 9For example, the frequency reuse factor is 8, and there are 8 ROs (RO a to RO h) at the same time domain position. At this time, the information c can include a mask: 00001111, where the first bit corresponds to the RO with the lowest frequency, the second bit corresponds to the RO with the second lowest frequency, and so on. In this way, the mask 00001111 means that the 4 ROs with lower frequency domain numbers are not shared, and the 4 ROs with higher frequencies are shared, and the bias of f_id is set to 4.

[0184] It should be understood that the message names or parameter names in the messages in the embodiments of the present application are only examples, and other names can also be used in specific implementations without limitation. For example, the information c can also be described as the first information, the second information, and so on.

[0185] The above mainly introduces the solutions provided in the embodiments of the present application from the perspective of the interaction between various nodes. It can be understood that in order to implement the above functions, each node, such as a terminal and a network device, includes a corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, combined with the algorithm steps of the examples described in the embodiments disclosed in this article, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware 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 exceed the scope of the present application.

[0186] The embodiments of the present application can divide the functional modules of the first device and the second device according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there can be other division methods in actual implementation.

[0187] Figure 10 The structure diagram of a communication device 100 is shown. The communication device 100 can be the first terminal, or a chip in the first terminal, or a system on a chip. The communication device 100 can be used to execute the functions of the first terminal involved in the above embodiments. As a feasible implementation method, Figure 10 The communication device 100 shown includes: a sending unit 1001 and a receiving unit 1002;

[0188] The sending unit 1001 is used to send a first message to the access network device on the first RO. For example, the sending unit 1001 can be used to support the communication device 100 to execute step 701.

[0189] A receiving unit 1002, configured to receive a first DCI from an access network device, where the first DCI is used to schedule a response message corresponding to a first message, and the first DCI is scrambled with an RNTI, and the RNTI is determined according to parameters of a first RO and a bias. For example, the receiving unit 1002 may be configured to support the communication device 100 to execute step 702.

[0190] Specifically, Figure 7 All relevant contents of each step involved in the foregoing method embodiment can be cited to the function description of the corresponding functional module, and will not be elaborated herein. The communication device 100 is configured to execute Figure 7 the function of the first terminal in the random access method shown in the foregoing method, and thus can achieve the same effect as the foregoing random access method.

[0191] As another implementable manner, Figure 10 the communication device 100 shown includes: a processing module and a communication module. The processing module is configured to control and manage the actions of the communication device 100. For example, the processing module may support the communication device 100 to execute a control function. The communication module may integrate the functions of the sending unit 1001 and the receiving unit 1002, and may be configured to support the communication device 100 to execute step 701, step 702, and communicate with other network entities, such as communicate with Figure 6 the functional modules or network entities shown. The communication device 100 may further include a storage module, configured to store program codes and data of the communication device 100.

[0192] Wherein, the processing module may be a processor or a controller. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present application. The processor may also be a combination that implements a computing function, such as a combination including one or more microprocessors, a combination of a DSP and a microprocessor, and so on. The communication module may be a transceiver circuit or a communication interface, etc. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device 100 involved in the embodiment of the present application may be Figure 6 the communication device 600 shown.

[0193] Figure 11 The structure diagram of a communication device 110 is shown. The communication device 110 may be an access network device, or a chip in the access network device, or a system on a chip. The communication device 110 may be configured to execute the functions of the access network device involved in the foregoing embodiments. As an implementable manner, Figure 11 the communication device 110 shown includes: a receiving unit 1101, a sending unit 1102;

[0194] A receiving unit 1101, configured to receive a first message from a first terminal on a first RO. For example, the receiving unit 1101 may support the communication device 110 to execute step 701.

[0195] A transmitting unit 1102, configured to send a first DCI of an access network device to the first terminal, where the first DCI is used to schedule a response message corresponding to the first message, and the first DCI is scrambled with an RNTI, and the RNTI is determined according to parameters of the first RO and a bias. For example, the transmitting unit 1102 may support the communication device 110 to execute step 702.

[0196] Specifically, all relevant contents of each step involved in the above Figure 7 illustrated method embodiments can be cited in the function descriptions of the corresponding functional modules, and will not be elaborated here. The communication device 110 is configured to execute Figure 7 the functions of the access network device in the random access method shown in the illustrated method, and thus can achieve the same effects as the above random access method.

[0197] As another implementable manner, Figure 11 the illustrated communication device 110 includes: a processing module and a communication module. The processing module is configured to control and manage the actions of the communication device 110. For example, the processing module may support the communication device 110 to execute management functions. The communication module may integrate the functions of the receiving unit 1101 and the transmitting unit 1102, and may be used to support the communication device 110 to execute step 701 and step 702 and communicate with other network entities, such as communicate with Figure 6 the functional modules or network entities shown. The communication device 110 may further include a storage module, configured to store program codes and data of the communication device 110.

[0198] Wherein, the processing module may be a processor or a controller. It may implement or execute various exemplary logic blocks, modules, and circuits described in combination with the disclosure of the present application. The processor may also be a combination that implements computing functions, such as a combination including one or more microprocessors, a combination of a DSP and a microprocessor, and so on. The communication module may be a transceiver circuit or a communication interface, etc. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device 110 involved in the embodiments of the present application may be Figure 6 the illustrated communication device 600.

[0199] Figure 12 is a structural diagram of a communication system provided by an embodiment of the present application, as shown in Figure 12As shown in the figure, the communication system may include: a terminal 120 and an access network device 121. The function of the terminal 120 is the same as that of the communication device 100 described above. The function of the access network device 121 is the same as that of the communication device 110 described above, and will not be elaborated.

[0200] The embodiment of the present application also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be completed by a computer program instructing relevant hardware. The program can be stored in the above computer-readable storage medium. When the program is executed, it may include the processes of the above method embodiments. The computer-readable storage medium may be the terminal in any of the foregoing embodiments, such as: an internal storage unit including a data sending end and / or a data receiving end, such as a hard disk or a memory of the terminal. The above computer-readable storage medium may also be an external storage device of the above terminal, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the above terminal. Further, the above computer-readable storage medium may also include both the internal storage unit and the external storage device of the above terminal. The above computer-readable storage medium is used to store the above computer program and other programs and data required by the above terminal. The above computer-readable storage medium may also be used to temporarily store data that has been output or will be output.

[0201] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0202] It should be understood that in this application, "at least one (item)" means one or more, "a plurality" means two or more, "at least two (items)" means two, three or more, and "and / or" is used to describe the relationship between associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Here, A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (one)" or its similar expression means any combination of these items, including any combination of single item (one) or plural items (ones). For example, at least one (one) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0203] It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A. For example, B can be determined according to A. It should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information. In addition, the "connection" mentioned in the embodiments of this application refers to various connection methods such as direct connection or indirect connection to achieve communication between devices, and this application does not make any limitation on this.

[0204] Unless otherwise specified, the "transmission" (transmit / transmission) mentioned in the embodiments of this application refers to two-way transmission, including the actions of sending and / or receiving. Specifically, the "transmission" in the embodiments of this application includes the sending of data, the receiving of data, or the sending and receiving of data. Or rather, the data transmission here includes uplink and / or downlink data transmission. Data can include channels and / or signals. Uplink data transmission is the transmission of uplink channels and / or uplink signals, and downlink data transmission is the transmission of downlink channels and / or downlink signals. The "network" and "system" mentioned in the embodiments of this application express the same concept, and a communication system is a communication network.

[0205] Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0206] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0207] The units described as separate components may or may not be physically separated. The components displayed as units can be one physical unit or multiple physical units, that is, they can be located in one place, or they can be distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0208] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0209] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions for causing a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks or optical discs that can store program codes.

[0210] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A random access method, characterized in that, the method includes: A first terminal sends a first message to an access network device on a first random access resource; The first terminal receives first downlink control information DCI from the access network device; wherein, the first DCI is used to schedule a response message corresponding to the first message, the first DCI is scrambled with a radio network temporary identity RNTI, and the RNTI is obtained according to an adjusted value of a parameter of the first random access resource, the adjusted value is obtained by adding a bias to the value of the parameter of the first random access resource, the bias is the bias of the parameter of the first random access resource, and the bias is indicated by first information.

2. The method according to claim 1, characterized in that, the first information includes the bias of the parameter; or, the bias of the parameter is calculated according to the RO configuration information of a second type of terminal, and the first information includes the RO configuration information of the second type of terminal; wherein, the RO configuration information of the second type of terminal is used to indicate the RO time domain position, frequency division multiplexing coefficient and starting frequency domain position of the second type of terminal; or, the first random access resource is included in a shared random access resource, and the first information includes first indication information; wherein, the first indication information is used to indicate a random access resource set and the shared random access resource in the random access resource set.

3. The method according to claim 1 or 2, characterized in that, the parameter of the first random access resource at least includes a frequency domain index f_id, the bias of the parameter includes the bias of the frequency domain index f_id, and the RNTI is calculated according to the parameter and the bias of the first random access resource, including: RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * (f_id + the bias) + Nsymbol * Nslot * Nf * ul_carrier_id; or, RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id' + Nsymbol * Nslot * Nf * ul_carrier_id; f_id' = f_id + the bias; wherein, the value of s_id is the index value of the symbol occupied by the first random access resource in a time slot, and the value range of s_id is [0, Nsymbol - 1]; wherein, the value of t_id is the index value of the time slot occupied by the first random access resource in a system frame, and the value range of t_id is [0, Nslot - 1]; Wherein, the value of the f_id is the index value of the frequency domain unit occupied by the first random access resource among Nf frequency domain units, and the Nf is the maximum value of the frequency division multiplexing coefficient preset for random access; the value range of the f_id is [0, C-1]; the C is a positive integer less than or equal to Nf, and the value of the C is the frequency division multiplexing coefficient used by the first terminal for random access; Wherein, the value of the ul_carrier_id is the index value of the uplink carrier occupied by the first random access resource among Nc uplink carriers, and the value range of the ul_carrier_id is [0, Nc-1]; The Nsymbol is the number of symbols included in one time slot, the Nslot is the number of time slots included in one system frame, the Nf is the maximum value of the frequency division multiplexing coefficient preset for random access, and the Nc is the number of preset uplink carriers.

4. The method according to claim 3, characterized in that, the bias of the f_id is less than Nf, and the Nf is the maximum value of the frequency division multiplexing coefficient preset for random access.

5. The method according to claim 1 or 2, characterized in that, the first terminal belongs to the first type of terminal, and the first random access resource is included in the random access resources shared by the first type of terminal and the second type of terminal.

6. The method according to claim 5, characterized in that, the first type of terminal includes a reduced-capability redcap terminal, and the second type of terminal includes a non-redcap terminal; or, the first type of terminal includes a terminal supporting coverage enhancement, and the second type of terminal includes a terminal not supporting coverage enhancement; or, the first type of terminal includes a terminal supporting access network slicing, and the second type of terminal includes a terminal not supporting access network slicing.

7. A random access method, characterized in that, the method includes: The access network device receives a first message from a first terminal on a first random access resource; The access network device sends first downlink control information DCI to the first terminal; wherein, the first DCI is used to schedule a response message corresponding to the first message, and the first DCI is scrambled with a radio network temporary identity RNTI, the RNTI is obtained according to an adjusted value of a parameter of the first random access resource; the adjusted value is obtained by adding a bias to the value of the parameter of the first random access resource, the bias is the bias of the parameter of the first random access resource, and the bias is indicated to the first terminal through first information.

8. The method according to claim 7, characterized in that, the first information includes the bias of the parameter; or, the bias of the parameter is calculated according to the RO configuration information of the first type of terminal and the RO configuration information of the second type of terminal, and the first information includes the RO configuration information of the second type of terminal; wherein, the RO configuration information of the second type of terminal is used to indicate the RO time domain position, frequency division multiplexing coefficient and starting frequency domain position of the second type of terminal; or, The first random access resource is included in the shared random access resources, and the first information includes first indication information; wherein, the first indication information is used to indicate a random access resource set and the shared random access resource in the random access resource set.

9. The method according to claim 7 or 8, characterized in that parameters of the first random access resource at least include a frequency domain index f_id, a bias of the parameter includes a bias of the frequency domain index f_id, and the RNTI is calculated according to the parameters and the bias of the first random access resource, including: RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * (f_id + the bias) + Nsymbol * Nslot * Nf * ul_carrier_id; or, RNTI = 1 + s_id + Nsymbol * t_id + Nsymbol * Nslot * f_id’ + Nsymbol * Nslot * Nf * ul_carrier_id; f_id’ = f_id + the bias; wherein, the value of s_id is an index value of the symbol occupied by the first random access resource in a time slot, and the value range of s_id is [0, Nsymbol - 1]; wherein, the value of t_id is an index value of the time slot occupied by the first random access resource in a system frame, and the value range of t_id is [0, Nslot - 1]; wherein, the value of f_id is an index value of the frequency domain unit occupied by the first random access resource among Nf frequency domain units, and Nf is a preset maximum value of a frequency division multiplexing factor for random access; the value range of f_id is [0, C - 1]; C is a positive integer less than or equal to Nf, and the value of C is a frequency division multiplexing factor used by the first terminal for random access; wherein, the value of ul_carrier_id is an index value of the uplink carrier occupied by the first random access resource among Nc uplink carriers, and the value range of ul_carrier_id is [0, Nc - 1]; Nsymbol is the number of symbols included in a time slot, Nslot is the number of time slots included in a system frame, Nf is a preset maximum value of a frequency division multiplexing factor for random access, and Nc is a preset number of uplink carriers.

10. The method according to claim 9, characterized in that the bias of f_id is less than Nf, and Nf is a preset maximum value of a frequency division multiplexing factor for random access.

11. The method according to claim 7 or 8, characterized in that the first terminal belongs to a first type of terminal, and the first random access resource is included in the random access resources shared by the first type of terminal and a second type of terminal.

12. The method according to claim 11, characterized in that The first type of terminal includes a reduced-capability RedCap terminal, and the second type of terminal includes a non-RedCap terminal; or, The first type of terminal includes a terminal supporting coverage enhancement, and the second type of terminal includes a terminal not supporting coverage enhancement; or, The first type of terminal includes a terminal supporting access network slicing, and the second type of terminal includes a terminal not supporting access network slicing.

13. A communication system, Characterized in that, The communication system includes: a first terminal and an access network device; The first terminal is configured to send a first message to the access network device on a first random access resource; The access network device is configured to receive the first message on the first random access resource, and send first downlink control information DCI to the first terminal, where the first DCI is used to schedule a response message corresponding to the first message, the first DCI is scrambled with a radio network temporary identity RNTI, and the RNTI is obtained according to an adjusted value of a parameter of the first random access resource; the adjusted value is obtained by adding a bias value to the value of the parameter of the first random access resource, the bias value is the bias value of the parameter of the first random access resource, and the bias value is indicated to the first terminal through first information; The first terminal is further configured to receive the first DCI.

14. A communication device, Characterized in that, The communication device includes a processor and a communication interface, and the processor and the communication interface are configured to support the communication device to execute the method according to any one of claims 1-6 or the method according to any one of claims 7-12.

15. A computer-readable storage medium, Characterized in that, The computer-readable storage medium stores computer instructions, and when the computer instructions run on a computer, the computer is caused to execute the method according to any one of claims 1-6 or the method according to any one of claims 7-12.

16. A computer program product, Characterized in that, The computer program product includes computer instructions, and when the computer instructions run on a computer, the computer is caused to execute the method according to any one of claims 1-6 or the method according to any one of claims 7-12.

17. A chip, Characterized in that, The chip includes a processor and a memory, the processor is coupled to the memory, the memory is configured to store computer instructions, and the processor executes the computer instructions to implement the method according to any one of claims 1-6 or the method according to any one of claims 7-12.

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