WO2022252841A1

WO2022252841A1 - Random access method and apparatus

Info

Publication number: WO2022252841A1
Application number: PCT/CN2022/086906
Authority: WO
Inventors: 李强; 薛祎凡
Original assignee: 华为技术有限公司
Priority date: 2021-06-04
Filing date: 2022-04-14
Publication date: 2022-12-08
Also published as: CN115442912A

Abstract

Embodiments of the present application disclose a random access method and apparatus. Different RO configuration information is designed for different RO sets. The method can comprise: for a first-type terminal, in the case that an RO resource of the first-type terminal comprises a plurality of RO sets, different RO sets correspond to different RO configuration information, and after selecting an SSB, the first-type terminal selects an RO corresponding to the SSB, selects a preamble according to the RO configuration information corresponding to an RO set, and transmits the preamble on the RO. The solution of the present application is suitable for the technical fields of communications, artificial intelligence, Internet of vehicles, smart home networking and the like.

Description

A random access method and device

This application is required to be submitted to the State Intellectual Property Office on June 4, 2021, the application number is 202110624411.8, and the application name is "A Random Access Sequence Division Method", and it is submitted to the State Intellectual Property Office on July 27, 2021. The priority of the Chinese patent application No. 202110851390.3, titled "A Random Access Method and Device", the entire content of the above patent is incorporated in this application by reference.

technical field

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

Background technique

At present, when the terminal is in the idle (idle) state or inactive (inactive) state, if the terminal has a service requirement, the terminal can select a suitable access network device, and in random access occasion (RO) Send the preamble sequence (preamble) on the Internet, perform random access, such as 4-step random access or 2-step random access, switch from the idle/inactive state to the connected (connected) state and then access the cell, and transmit uplink data to the access network equipment data.

Among them, how to configure the RO for the terminal and the preamble corresponding to the RO are issues that have been discussed.

Contents of the invention

Embodiments of the present application provide a random access method and device to solve the problem of configuring ROs for terminals and preambles corresponding to ROs.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

In a first aspect, an embodiment of the present application provides a random access method, the method including: a first terminal belonging to a first type of terminal receives at least one synchronization signal block (synchronization signal block, SSB) from an access network device, Select the first SSB from at least one SSB, select the first RO corresponding to the first SSB from the RO resources of the first type of terminal, and send the first message carrying the preamble to the access network device on the first RO.

Correspondingly, corresponding to the access network device side, this embodiment of the present application also provides a random access method, the method includes: the access network device sends at least one SSB, and receives a message from the A first message of a first terminal of a first type of terminal, where the first message carries a preamble.

The first RO corresponding to the first SSB is included in the RO resources of the first type of terminal. The RO resource of the first type of terminal includes multiple RO sets, and different RO sets correspond to different RO configuration information, and the RO configuration information corresponding to the RO set includes the preamble used to indicate the preamble allocated to the first type of terminal in the preamble corresponding to the RO set information.

Based on the first aspect, the RO resources of a type of terminal can be divided into multiple RO sets, for example, divided into multiple different RO sets according to the RO sharing methods. Different RO sets have different sharing methods, and different RO sets correspond to Different RO configuration information, that is, with the RO set as the granularity, according to the sharing method of the ROs included in the RO set, independently indicate the allocation of the preamble corresponding to the RO set, such as which preambles in the preamble corresponding to the RO set are allocated to the first type Terminal use, which ones are allocated to the second type of terminals; or, which ones are allocated to 4-step RA, which ones are allocated to 2-step RA, etc. In order to accurately distinguish the terminal type and/or random access mode that initiates the random access through the preamble sent on the RO, and avoid random access conflicts.

In a possible design, the method further includes: the first terminal receiving a system message from the access network device, where the system message includes RO configuration information corresponding to each RO set in multiple RO sets. Correspondingly, on the access network device side, the access network device sends a system message, where the system message includes RO configuration information corresponding to each RO set.

Based on this possible design, the RO configuration information corresponding to each RO set can be broadcast through system messages, so that terminals in the cell can receive the RO configuration information, simplify system design, and save signaling overhead.

In a possible design, the system message further includes configuration information of the initial BWP of the first type of terminal, and the RO configuration information corresponding to each RO set includes the configuration information of the initial BWP. In this way, the relevant configuration of the RO can be associated with the initial BWP, which simplifies the system design.

In a possible design, multiple RO sets include a first RO set and a second RO set, and the time-frequency information of the first RO set is different from that of the second RO set; the RO configuration information corresponding to the first RO set It is also used to indicate the time-frequency information of the first RO set; the RO configuration information corresponding to the second RO set is also used to indicate the time-frequency information of the second RO set. Based on this possible design, when the time-frequency positions corresponding to different RO sets are different, the time-frequency positions of each RO set are indicated independently, which simplifies system design.

In a possible design, the multiple RO sets include the first RO set and the second RO set, and the time-frequency information of the first RO set is the same as the time-frequency information of the second RO set. At this time, the system message also includes an indication The mask of the first RO set, and the same time-frequency information corresponding to multiple RO sets. Based on this possible design, when multiple RO sets correspond to the same time-frequency position, only one time-frequency information can be configured to save signaling overhead. At the same time, in order to distinguish different RO sets, the mask corresponding to the RO set can be used Indicates the RO set, simplifying system design.

In a possible design, the time-frequency information of the RO set includes the time domain position of the RO set, the frequency division multiplexing coefficient, and the starting frequency domain position of the RO set; the starting frequency domain position of the RO set is the starting frequency domain position of the RO set. The offset between the RO and the start frequency of the initial BWP, the offset is an integer greater than or equal to 0, or an integer less than 0.

Based on this possible design, an RO set can be located by indicating information such as time domain position, frequency division multiplexing coefficient, and initial frequency domain position, which simplifies system design. At the same time, the frequency of the initial RO of the RO set is not limited, which can It overlaps with the initial frequency of the initial BWP, that is, the offset value is 0, and its frequency can also be greater than the initial frequency of the initial BWP, or less than the initial frequency of the initial BWP, etc., to flexibly and effectively design the initial RO of the RO set Location.

In a possible design, the relationship between the starting frequency domain position of the RO set and the starting frequency domain position of the initial BWP of the terminal, the system bandwidth, and the offset of the starting RO of the RO set relative to the starting frequency of the system bandwidth There is an association. Based on this possible design, when the value of one or more of these parameters is known, the value of another unknown parameter among these parameters can be calculated based on the value of the known parameter, simplifying the system design.

In a possible design, each RO in the RO set corresponds to N groups of SSBs, and each group of SSBs includes M SSBs; different SSBs correspond to different preambles; where M and N are integers greater than or equal to 1. Based on this possible design, when multiple SSBs share the RO, each SSB can be configured with its own preamble, so that the preamble can be used to distinguish which SSB it is, and the system design can be simplified.

In a possible design, for the mth SSB in the nth group, the number of the initial preamble assigned to the first type of terminal in the preamble corresponding to the SSB is based on M, N, R, Q and

Determine; wherein, R is the total number of preambles used for other types of terminals except the first type of terminal in the preamble corresponding to the SSB group, and R is an integer greater than or equal to 0; the value range of n is [0, N- 1], N is an integer greater than or equal to 1;

is the total number of preambles used for random access in the preamble corresponding to the RO set,

is an integer greater than 1; the value range of m is [0, M-1], and M is an integer greater than or equal to 1; Q is the total number of preambles used for the first type of terminal in the preamble corresponding to the SSB group.

Based on this possible design, when multiple types of terminals share ROs and the RO is shared by multiple SSBs of the first type of terminals, for one SSB of the first type of terminals, the preamble configured for the SSB can be allocated according to the The number of preambles for other types of terminals and the number of preamles allocated to other SSBs are determined, simplifying system design.

In one possible design,

That is, the number of the initial preamble used by the SSB can be calculated according to the preset mathematical model, which simplifies the system design.

In a possible design, the following first information indicates the preamble allocated to the first type of terminal in the preamble corresponding to the RO set: the first information includes a bitmap (bitmap), and the bitmap includes multiple bits, one The bit corresponds to one or more preambles in the preamble corresponding to the RO set; when the value of the bit is the first value, the preamble corresponding to the bit is allocated to the first type of terminal; when the value of the bit is the second value, the bit The corresponding preamble is not allocated to the first type of terminal, that is, the allocated preamble is indicated by a bit sequence; or, the first information includes one or more of the following information: the preamble allocated to the first type of terminal in the preamble corresponding to the RO set The number of preambles, the number of the initial preamble allocated to the first type of terminal, and the number of unusable preambles among the preambles allocated to the first type of terminal; or, the first information includes one or more of the following information: The number of the start preamble and the number of the end preamble allocated to the first type of terminal in the preamble corresponding to the RO set, and the number of the unusable preamble among the preambles allocated to the first type of terminal.

Based on this possible design, it is possible to flexibly and effectively indicate the preamble allocated to the first type of terminal.

In a possible design, all ROs in the RO resource are located in the initial BWP of the first type of terminal; or, part or all of the ROs in the RO resource are located outside the initial BWP of the first type of terminal. That is to say, this application does not limit the location of the RO resources of the first type of terminals, and the RO resources can be configured independently for the first type of terminals, or can share the RO resources of other types of terminals without limitation, which increases the flexibility of RO resource configuration.

In a possible design, if the first RO is in the second type of initial BWP, the method further includes: the first terminal switches the initial BWP for random access from the initial BWP of the second type of terminal to the first The initial BWP of the type terminal; the first terminal receives the first response from the access network device on the initial BWP of the first type terminal; wherein, the first response corresponds to the first message. That is, after the first type of terminal initiates random access on the RO other than its own initial BWP resource, the first type of terminal can switch the working frequency back to its own initial BWP, so as to ensure information transmission on its own transmission resource and improve Transmission correctness.

In a possible design, the terminal types and/or random access methods corresponding to different RO sets are different. The multiple RO sets are obtained by dividing according to the random access mode corresponding to the RO included in the RO resource; and/or, the multiple RO sets are obtained according to the terminal type corresponding to the RO included in the RO resource. Based on this possible design, different RO sets may be divided based on terminal type and/or in a random manner, and different RO configuration information may be designed based on allocation of preambles corresponding to different RO sets.

In a second aspect, an embodiment of the present application provides a random access method, the method comprising: a first terminal belonging to a first type of terminal receives at least one synchronization signal block (synchronization signal block, SSB) from an access network device, Select the first SSB from at least one SSB, select the first RO corresponding to the first SSB from the RO resources of the first type of terminal, and send the first message carrying the preamble to the access network device on the first RO.

The first RO corresponding to the first SSB is included in the RO resources of the first type of terminal. All the ROs in the RO resources of the first type of terminal are located in the initial BWP of the first type of terminal; or, some or all of the ROs in the RO set of the first type of terminal are located outside the initial BWP of the first type of terminal, such as the first Some or all of the ROs in the RO set of the type terminal are located in the initial BWP of the second type terminal.

Based on the second aspect, the location of the RO resource of the first type of terminal is not limited, the RO resource can be configured for the first type of terminal independently, and the RO resources of other types of terminals can also be shared without limitation, which increases the flexibility of RO resource configuration . At the same time, in the case that multiple types of terminals share the RO, the utilization rate of the RO can be improved.

In a possible design, the initial BWP of the first type of terminal and the initial BWP of the second type of terminal are independent of each other; or, the initial BWP of the first type of terminal overlaps partially or completely with the initial BWP of the second type of terminal. Based on this possible design, the configuration flexibility of the initial BWP can be increased, and at the same time, the utilization rate of the initial BWP can be improved in the case of sharing the initial BWP of multiple types of terminals.

In a third aspect, the present application provides a communication device, which may be a first terminal or a chip or a system-on-a-chip in the first terminal, and may implement any possible design of the first aspect or the second aspect or the first aspect Or the function of the terminal in any possible design of the second aspect. This function can be implemented by hardware or software modules. For example, the communication device may include: a receiving unit, a processing unit, and a sending unit.

The receiving unit is configured to receive at least one SSB from the access network device.

The processing unit is configured to select a first SSB from at least one SSB, and select a first RO corresponding to the first SSB from RO resources of the first type of terminal.

A sending unit, configured to send the first message carrying the preamble to the access network device on the first RO.

In a possible design, the first RO corresponding to the first SSB is included in the RO resources of the first type of terminal. The RO resource of the first type of terminal includes multiple RO sets, and different RO sets correspond to different RO configuration information, and the RO configuration information corresponding to the RO set is used to indicate the preamble allocated to the first type of terminal in the preamble corresponding to the RO set.

In yet another possible design, all ROs in the RO resource of the first type of terminal are located in the initial BWP of the first type of terminal; or, some or all of the ROs in the RO set of the first type of terminal are located in the initial BWP of the first type of terminal In addition to the initial BWP, for example, some or all of the ROs in the RO set of the first type of terminal are located in the initial BWP of the second type of terminal.

Specifically, for the first type of RO resources, the different RO sets included in the first type of RO resources, and the different RO configuration information corresponding to the different RO sets, you can refer to the first aspect or the second aspect or any possibility of the first aspect. described in the design or any possible design of the second aspect, and will not be described in detail.

In a fourth aspect, the present application provides a communication device. The communication device may be an access network device or a chip or a system-on-a-chip in the access network device, and may implement any possibility of the first aspect, the second aspect, or the first aspect. The design of or any possible design of the second aspect of the function of the terminal. This function can be implemented by hardware or software modules. For example, the communication device may include: a sending unit and a receiving unit.

A sending unit, configured to send at least one SSB.

The receiving unit is configured to receive the first message carrying the preamble from the first terminal on the first RO.

In a possible design, the first RO corresponding to the first SSB is included in the RO resources of the first type of terminal. The RO resource of the first type of terminal includes multiple RO sets, and different RO sets correspond to different RO configuration information, and the RO configuration information corresponding to the RO set is used to indicate the preamble allocated to the first type of terminal among the preambles corresponding to the RO set.

In a fifth aspect, a communication device is provided, and the communication device may be a first terminal or a chip or a system on a chip in the first terminal. The communication device may implement the above aspects or the functions performed by the first terminal in each possible design, and the functions may be implemented by hardware. Alternatively, the communication device may be an access network device or a chip or a system on a chip in the access network device. The communication device can realize the functions performed by the access network equipment in the above aspects or in each possible design, and the functions can be realized by hardware. In a possible design, the communication device may include: a processor and a communication interface, and the processor and the communication interface may support the communication device to perform the first aspect or any possible design of the first aspect, or the second aspect or the first aspect. Either of two possible designs of the described method. In yet another possible design, the communication device may further include a memory, and the memory is used for storing necessary computer-executable instructions and data of the communication device. When the communication device is running, the processor executes the computer-executable instructions stored in the memory, so that the communication device performs the first aspect or any possible design of the first aspect or the second aspect or the second aspect random access method described in any possible design.

In a sixth aspect, a computer-readable storage medium is provided. The computer-readable storage medium may be a readable non-volatile storage medium. Instructions are stored in the computer-readable storage medium. When the computer-readable storage medium is run on a computer, the , causing 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.

In a seventh aspect, there is provided a computer program product containing instructions, which, when run on a computer, cause the computer to execute the first aspect or any possible design of the first aspect or the second aspect or any of the second aspects. A possible design is described in the random access method.

In an eighth aspect, a communication device is provided, and the communication device may be a first terminal or a chip or a system on a chip in the first terminal, or an access network device or a chip or a system on a chip in the access network device. The communication device includes one or more processors, 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 codes, the computer program codes include computer instructions, when the one or more processors When the computer instructions are executed, the communication device is made 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.

Wherein, the technical effect brought by any one of the design methods from the third aspect to the eighth aspect can refer to the above-mentioned first aspect or the technical effect brought by any possible design method of the first aspect, and will not be repeated here.

In a ninth aspect, the embodiment of the present application provides a communication system, where the communication system may include: a first terminal and an access network device. The first terminal may 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, and the access network device may execute the first aspect or the second aspect. A method described in any possible design of the first aspect or the second aspect or any possible design of the second aspect.

Description of drawings

Figure 1 is a schematic diagram of sending SSB;

Figure 2a is a schematic diagram of 4-step random access;

Figure 2b is a schematic diagram of 2-step random access;

Figure 3a is a schematic diagram 1 of the corresponding relationship between SSB and RO;

Figure 3b is a second schematic diagram of the corresponding relationship between SSB and RO;

Figure 4a is a schematic diagram of the preamble corresponding to RO;

Figure 4b is a schematic diagram 2 of the preamble corresponding to RO;

Figure 4c is a schematic diagram of shared RO;

FIG. 5 is a simplified schematic diagram of a system architecture provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of the composition of a communication device provided in an embodiment of the present application;

FIG. 7 is a flow chart of a random access method provided in an embodiment of the present application;

FIG. 8a is a schematic diagram 1 of a group of RO resources shared by multiple types of terminals provided by an embodiment of the present application;

FIG. 8b is a second schematic diagram of a group of RO resources shared by multiple types of terminals provided by the embodiment of the present application;

FIG. 8c is a third schematic diagram of a group of RO resources shared by multiple types of terminals provided by the embodiment of the present application;

FIG. 8d is a schematic diagram 4 of a group of RO resources shared by multiple types of terminals provided by the embodiment of the present application;

FIG. 9a is a first schematic diagram of a group of RO resources shared by multiple types of terminals provided by an embodiment of the present application;

FIG. 9b is a second schematic diagram of a group of RO resources shared by multiple types of terminals provided by the embodiment of the present application;

FIG. 9c is a third schematic diagram of a group of RO resources shared by multiple types of terminals provided by the embodiment of the present application;

Fig. 10a is a schematic diagram 1 of preamble allocation provided by the embodiment of the present application;

Figure 10b is a second schematic diagram of the preamble allocation provided by the embodiment of the present application;

Figure 10c is a schematic diagram 3 of the preamble allocation provided by the embodiment of the present application;

Figure 10d is a schematic diagram 4 of the preamble allocation provided by the embodiment of the present application;

Figure 11a is a schematic diagram five of the preamble allocation provided by the embodiment of the present application;

Figure 11b is a schematic diagram six of the preamble allocation provided by the embodiment of the present application;

FIG. 12 is a schematic diagram of the composition of a communication device 120 provided by an embodiment of the present application;

FIG. 13 is a schematic diagram of the composition of a communication device 130 provided by an embodiment of the present application;

FIG. 14 is a schematic diagram of a communication system provided by an embodiment of the present application.

Detailed ways

In the communication system, after the terminal is turned on or in a scenario such as cell handover, the terminal can detect the synchronization signal block (synchronization signal block, SSB) sent by the surrounding access network equipment, and select the SSB according to the SSB and system information sent by the access network equipment. The access network device capable of providing network services for the terminal initiates random access (random access, RA) to the selected access network device on the RO corresponding to the SSB, and accesses the cell covered by the access network device (or the cell corresponding to the SSB), data transmission is performed with the access network device through a radio resource control (radio resource control, RRC) connection between the terminal and the access network device.

In the embodiment of the present application, the SSB may include a synchronization sequence (synchronize signal, SS) and a physical layer broadcast channel (physical broadcast channel, PBCH). System information (system information) may include a master information block (master information block, MIB) and a system information block (system information block, SIB). The SS can be used for synchronizing the transmission between the terminal and the access network equipment. The system message may include some communication parameters of the cell, for example, the system message may include one or more of initial bandwidth part (initial bandwidth part, initial BWP) configuration information, system bandwidth size, subcarrier spacing, and frame structure configuration. Taking the cell (or sector) as the granularity, in order to make the signal sent by the access network equipment cover the entire cell, one cell can correspond to one or more SSBs, one SSB corresponds to one beam, and different beams correspond to different numbers of SSBs. The access network equipment can transmit one or more SSBs in the cell, and the terminals in the cell can receive and detect the signal quality of one or more SSBs, and determine which beam corresponding to the SSB can provide better signal quality according to the detection results, such as The beam corresponding to the SSB with the largest received signal energy may be determined as the beam with better signal quality.

For example, taking the access network equipment as a base station, as shown in Figure 1, 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 For 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 can meet the access requirements, then 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 random access to the base station on the RO corresponding to SSB2.

In this embodiment of the application, the random access mentioned above may refer to contention-based random access (or called contention-based random access or competitive random access, etc.), and the random access may include 4-step random access Access (4-step RA) or 2-step random access (2-step RA). As opposed to contention-based random access, there is also non-contention-based random access (or called non-contention-based random access or non-competitive random access). Non-contention random access can be applied to scenarios such as cell handover, or downlink data transmission needs but out of synchronization. Non-contention random access can refer to the terminal using the specified Random access initiated by preamble of non-contention random access. It should be understood that, unless otherwise specified, the random access mentioned in this application refers to contention-type random access, and this application does not discuss non-contention-type random access. The following introduces 4-step random access and 2-step random access:

Referring to Figure 2a, it is a 4-step random access. As shown in Figure 2a, the 4-step random access may include: Step (1), the terminal selects a random access channel (random access channel, RA) opportunity (RA occasion, RO) , and send a message 1 (message 1, Msg1) to the access network device on the selected RO to notify the access network device that there is a random access request. Wherein, the first message may include a preamble (or called a preamble or a random access preamble, etc.). Step (2), after receiving Msg1, the access network device sends a random access response (random access response) to the terminal. The random access response can also be called message 2 (message 2, Msg2). Wherein, message 2 may include scheduling information of message 3 (message 3, Msg3), and message 2 may be used to instruct the terminal how to send message 3. The terminal corresponds to receiving 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 a message four (message 4, Msg4) to the terminal, the message four may include a response message determined by the access network device for Msg3, and the response message may include a contention for contention between terminals Related Information.

Referring to FIG. 2b, it is a 2-step random access. As shown in FIG. 2b, the 2-step random access may include: step (1), the terminal selects an RO, and sends a carrying message A (message A, the physical random access channel (physical random access channel, PRACH) of MsgA), and the physical uplink shared channel (physical uplink shared channel, PUSCH), MsgA may include preamble. Step (2), the access network device receives MsgA, and replies a message B (message B, MsgB) to the terminal, where MsgB may include relevant information for resolving competition among terminals.

In this embodiment of the application, there is a corresponding relationship between SSB and RO. The RO used to send the preamble may be selected from one or more ROs corresponding to the SSB, and the RO may be used when the terminal performs random access. The frequency resource, specifically, the RO may be the time-frequency resource used by the terminal to send the preamble, for example, the RO may be the time-frequency resource used by the terminal to send the Msg1 or MsgA carrying the preamble. The time-frequency resources will occupy part of the frequency domain resources on part of the time domain resources. The measurement units of the time domain resources include symbols, time slots, and system frames, etc. The measurement range of the frequency domain resources includes carriers, physical resource blocks (physical resource blocks, PRB) and so on. The correspondence relationship/correspondence rule between SSB and RO can be preset by the access network device, and the correspondence relationship/correspondence rule between SSB and RO can include: sorting ROs from low frequency to high frequency in chronological order, every K SSB corresponds to one RO. In an example, K may be an integer greater than or equal to 1, that is, one or more SSBs may correspond to one RO. For example, K may be 1, indicating that one SSB corresponds to one RO. For another example, K may be 2, indicating that two SSBs correspond to one RO. For another example, K may be 4, indicating that four SSBs correspond to one RO, or K may be 8, indicating that eight SSBs correspond to one RO, and so on. Or in another example, K may be a number less than 1, which means that one SSB may correspond to multiple ROs, and multiple ROs may be continuous. For example, K can be 1/2, indicating that one SSB can correspond to two ROs. For another example, K can be 1/4, which means that one SSB can correspond to four ROs. It should be understood that the "corresponding" mentioned in the present application may also be described as "mapping to", etc. without limitation.

Specifically, some ROs may be allocated to terminals in a certain cell periodically, and these ROs correspond to one or more SSBs used by the cell, so as to ensure that each SSB has a corresponding RO. In this application, some ROs configured for the terminal may be referred to as RO resources, which will be described in a unified manner here, and will not be described in detail below. Exemplarily, some time-frequency resources can be divided from the initial BWP as RO resources, that is, the RO resources can be included in the initial BWP and are part of the initial BWP. RO configuration information can be carried in the configuration information of the initial BWP. The configuration information of the initial BWP can indicate the bandwidth size of the initial BWP, the initial frequency domain position, etc., and the RO configuration information can indicate the initial frequency domain position of the RO resource, the frequency Division multiplexing coefficient, time domain position of RO, etc. It should be understood that the "allocation" mentioned in this application may also be described as "configuration (configuration)" or "determination" instead, without limitation.

For example, Fig. 3a and Fig. 3b show RO resources allocated to terminals in a cell within a cycle (such as slot 10-slot 70), and the cell uses 4 SSBs, numbered SSB0-SSB3. It should be understood that the time-frequency positions of RO resources in other periods are the same as those shown in FIG. 3a and FIG. 3b , and will not be described in detail. As shown in Figure 3a and Figure 3b, 80MHz is divided from the 100MHz system bandwidth as the initial BWP, and some fixed and periodic time-frequency resources are divided from the initial BWP as RO resources. The initial frequency domain position of RO resources The distance from PRB 0 of the initial BWP is 10 PRB. The RO resources include multiple ROs. The frequency division multiplexing coefficient of the ROs is 4. The ROs are sent according to the time domain resources configured in one cycle. The RO resource corresponds to SSB0-SSB3. As shown in Figure 3a, the correspondence between RO resources and SSB0-SSB3 includes: one SSB corresponds to two ROs, for example, SSB0 corresponds to two ROs with lower frequencies on slot10, and SSB1 corresponds to two ROs with higher frequencies on a RO and so on. As shown in Figure 3b, the correspondence between RO resources and SSB0-SSB1 includes: two SSBs correspond to one RO. For example, SSB0 and SSB1 correspond to the same RO on slot1, that is, SSB0 and SSB1 share the same RO. For another example, as shown in FIG. 3b , SSB2 and SSB3 correspond to the same RO of slot1, that is, SSB2 and SSB3 share the same RO.

In the embodiment of the present application, 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 time slot (slot)). The frequency division multiplexing coefficient of the RO can be set as required, and details are not described here. As shown in FIG. 3 a , the frequency division multiplexing coefficient of the RO is 4, and slot 10 includes 4 ROs, and the 4 ROs correspond to different PRBs.

In this embodiment of the present application, the preamble sent by the terminal on the RO may be a preamble selected from the preamble set corresponding to the RO. A preamble can correspond to a number (or called a serial number). The numbers corresponding to different preambles in the preamble set can be different. This number can be called the preamble identifier (random access preamble identifier, RAPID), and the preamble number can be used to identify/ Identify the preamble. The preamble set can be pre-configured or pre-specified by the protocol. For example, the system message can include one or more parameters such as the number of preambles included in the preamble set corresponding to the RO, the number of the starting preamble, and the number of the ending preamble, to indicate the corresponding RO. preamble.

As mentioned above, an RO can correspond to one SSB or multiple SSBs. In order to ensure that the SSBs corresponding to the RO have usable preambles, the preambles corresponding to the ROs can be divided, and a usable preamble can be assigned to each SSB. After selecting/determining the RO corresponding to the SSB, the terminal can find the preamble allocated to the SSB in the preamble corresponding to the RO, and select a preamble from the preamble allocated to the SSB to initiate random access.

For example, taking one SSB corresponding to multiple ROs as an example, Figure 4a shows the preamble set corresponding to the RO, and the preamble set includes 60 preambles, of which 32 preambles numbered 0-numbered 31 are used for contention-type random access, The preamble numbers 32-59 are used for non-contention random access. At this time, if the preamble set corresponding to the RO selected by the terminal is shown in Figure 4a, the terminal can select a preamble from 32 numbered 0-numbered 31 shown in Figure 4a to initiate contention-type random access.

As another example, taking one RO corresponding to multiple SSBs, such as RO corresponding to SSB0 and SSB1 as an example, Fig. 4b shows the preamble set corresponding to RO, the preamble set includes 60 preambles, and the 30 preambles numbered 0-numbered 29 are used For/corresponding to SSB0, the 16 preambles numbered 0-15 are used for contention-based random access for terminals that select SSB0, and the preambles numbered 16-29 are used for non-contention-type random access. The preamble No. 30-No. 59 is used for/corresponding to SSB1, the preamble No. 30-No. 45 is used for the terminal that selects SSB1 for contention-based random access, and the preamble No. 46-No. 59 is used for non-competition based on SSB1 random access. At this time, if the terminal selects SSB0, the terminal may select a preamble from the 16 numbered 0-numbered 15 shown in FIG. 4b to initiate contention-type random access.

As can be seen from the above, random access includes 4-step RA and 2-step RA. In order to improve the utilization of RO resources, 4-step RA and 2-step RA can share part or all of RO resources. For ROs shared by 4-step RA and 2-step RA, both 4-step RA supports 2-step RA on the RO. For example, as shown in Figure 4c, it is assumed that the access network equipment uses 4 beams to cover the cell, so there are 4 periodically transmitted SSBs: SSB0-SSB3, and each SSB can be mapped to 4 consecutive ROs (such as RO0-RO3 )superior. 4-step RA uses all ROs in RO resources. Among the four consecutive ROs mapped to the SSB, the RO numbered 1 (RO1) can also be used for 2-step RA, that is, RO1 numbered in Figure 4c is shared by 4-step RA and 2-step RA , and other ROs except RO1 are exclusive to 4-step RA, and only 4-step RA is supported.

In addition, in practical applications, there are different types of terminals. For example, according to the communication capabilities/hardware specifications of the terminals, the terminals can be divided into reduced capability (reduced capability, redcap) terminals and non-redcap (non-redcap) terminals. Wherein, the non-redcap terminal may be a normal (normal) terminal device. Among them, the redcap terminal supports 20 megahertz (MHz) bandwidth, 1 receiving antenna (RX) or 2 receiving antennas (2RX). Non-redcap terminals support 100MHz bandwidth, 4 receiving antennas (4RX), etc. When performing the random access process, the access network device may configure a dedicated random access channel (random access channel, RACH) resource (such as a dedicated RO, etc.) for the redcap terminal. The redcap terminal can send Msg1 or MsgA on the RACH resource corresponding to the redcap terminal configured by the access network device, and the access network device can receive Msg1 or MsgA on the RACH resource, and can learn that the terminal is a redcap terminal according to the RACH resource. Alternatively, in order to improve RO resource utilization, the access network device may also configure an RO shared by redcap terminals and non-redcap terminals (in this application, it may be simply referred to as shared RO), that is, configure the same RO for redcap terminals and non-redcap terminals.

As mentioned above, all or part of ROs in RO resources can be shared by multiple types of terminals, and/or shared by 4-step RAs and 2-step RAs, that is, RO resources can include: unshared ROs, shared ROs , the sharing mode corresponding to the shared RO includes sharing of multiple types of terminals, sharing of multiple random access modes, and the like. Since random access to a cell is initiated randomly by terminals in the cell, at a certain moment, if two different types of terminals (such as redcap terminals and non-redcap terminals) initiate random access on the shared RO, and these two types of terminals initiate random access on the shared RO If the preambles are the same, for the access network device side, the RO and the preamble cannot be used to distinguish the type of terminal that initiates random access, which leads to random access conflicts. Or at a certain moment, if two different terminals of the same type use different random access methods to initiate random access on the shared RO, and the two terminals use the same preamble to initiate random access, then the access network device On the other hand, RO and preamble cannot be used to distinguish which type of random access is initiated, which leads to random access conflicts.

In order to solve this problem, the embodiment of the present application takes the random access initiated by the first terminal belonging to the first type of terminal as an example, and provides a random access method. The method may include: the first terminal receives the random access from the access network device At least one SSB, if the first terminal detects that the first SSB of the at least one SSB meets the random access condition, the first terminal selects the first RO corresponding to the first SSB from the RO resources of the first type of terminal, and selects the first RO corresponding to the first SSB from the first RO resource of the first type of terminal. A preamble is randomly selected from the preamble set corresponding to an RO, and a first message including the preamble is sent to the access network device on the first RO. The first RO includes the RO resource of the first type of terminal. As mentioned above, all or part of the RO in the RO resource can be shared by multiple types of terminals including the first type of terminal, and/or by multiple RAs. Types (such as 4-step RA and 2-step RA) are shared. In the case of sharing, in order to distinguish/identify which type of terminal initiates random access and/or which type of RA is initiated, the preamble corresponding to the shared RO can be divided. Different types of terminals and/or different types of RAs correspond to different The preamble of the non-shared RO can only distinguish the terminal and/or the initiated RA based on the RO. For these two types of ROs, the preamble configuration methods are different. Based on the sharing situation and non-sharing situation, the RO resources of the first type of terminal can be divided into multiple RO sets, and different RO sets correspond to different RO configuration information. Information about the preamble used by the class terminal. In this way, specific/dedicated preambles are assigned to different RO sets, so as to distinguish which random access method and/or which type of terminal initiates random access, and avoid random access conflicts between terminals.

It should be understood that the RO set described in this application is obtained by dividing the random access mode corresponding to the RO included in the RO resource; and/or obtained by dividing the terminal type corresponding to the RO included in the RO resource. The terminal types and/or random access methods corresponding to different RO sets are different. The ROs included in the RO set may be continuous or discontinuous in frequency, without limitation. For example, multiple consecutive ROs shared by multiple types of terminals can be regarded as an RO set, ROs shared by multiple RAs can be regarded as an RO set, and ROs shared by multiple types of terminals and multiple types of RAs can also be regarded as an RO set. An RO set, which treats unshared ROs as an RO set and so on.

The following describes the random access method provided by the embodiment of the present application with reference to the drawings in the specification.

The random access method provided by the embodiment of the present application can be used in a fourth generation (4th generation, 4G) system, a long term evolution (long term evolution, LTE) system, a fifth generation (5th generation, 5G) system, a new air interface (new radio) , NR) system, NR-vehicle-to-everything communication (vehicle-to-everything, V2X) system, and any system in the Internet of Things system can also be applied to other next-generation communication systems, etc., without limitation. The following describes the random access method provided by the embodiment of the present application by taking the communication system shown in FIG. 5 as an example.

FIG. 5 is a schematic diagram of a communication system provided by an embodiment of the present application. As shown in FIG. 5 , the communication system may include an access network device and multiple terminals, such as terminal 1 and terminal 2 . In the system shown in Fig. 5, the terminal can be in an idle state or an inactive state. It should be noted that FIG. 5 is an exemplary framework diagram, and the number of nodes included in FIG. 5 is not limited, and in addition to the functional nodes shown in FIG. 5, other nodes may also be included, such as: core network equipment, gateway equipment, Application servers, etc., are not limited.

Among them, the access network equipment is mainly used to implement functions such as terminal resource scheduling, radio resource management, and radio access control. Specifically, the access network device may 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 node.

The terminal may be a terminal equipment (terminal equipment), a user equipment (user equipment, UE) or a mobile station (mobile station, MS) or a mobile terminal (mobile terminal, MT), etc. Specifically, the terminal can be a mobile phone, a tablet computer, or a computer with a wireless transceiver function, and can also be a virtual reality (virtual reality, VR) terminal, an augmented reality (augmented reality, AR) terminal, or a wireless terminal in industrial control. Terminals, wireless terminals in unmanned driving, wireless terminals in telemedicine, wireless terminals in smart grids, wireless terminals in smart cities, smart homes, vehicle-mounted terminals, etc. In the embodiment of the present application, the device for realizing the function of the terminal may be a terminal, or a device capable of supporting the terminal to realize the function, such as a chip system (such as a chip or a processing system composed of multiple chips). The following describes the random access method provided by the embodiment of the present application by taking the terminal as an example of the device for realizing the function of the terminal.

During specific implementation, each network element shown in FIG. 5 , such as a terminal and an access network device, may adopt the composition structure shown in FIG. 6 or include the components shown in FIG. 6 . Fig. 6 is a schematic diagram of the composition of a communication device 600 provided by the embodiment of the present application. When the communication device 600 has the function of the terminal described in the embodiment of the present application, the communication device 600 can be a terminal or a chip in the terminal or an on-chip system. When the communication device 600 has the function of the access network device described in the embodiment of the present application, the communication device 600 may be the access network device or a chip or a system on chip in the access network device.

As shown in FIG. 6 , the communication device 600 may include a processor 601 , a communication line 602 and a communication interface 603 . Further, the communication device 600 may further include a memory 604 . Wherein, the processor 601 , the memory 604 and the communication interface 603 may be connected through a communication line 602 .

Wherein, the processor 601 may be a central processing unit (central processing unit, CPU), a general-purpose processor, a network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller , programmable logic device (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.

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

The communication interface 603 is used for communicating with other devices or other communication networks. The other communication network may be an Ethernet, a radio access network (radio access network, RAN), a wireless local area network (wireless local area networks, WLAN), and the like. The communication interface 603 may be a radio frequency module, a transceiver or any device capable of realizing communication. This embodiment of the present application is described by taking the communication interface 603 as an example of a radio frequency module, where the radio frequency module may include an antenna, a radio frequency circuit, and the like, and the radio frequency circuit may include a radio frequency integrated chip, a power amplifier, and the like.

The memory 604 is used for storing instructions. Wherein, the instruction may be a computer program.

Wherein, the memory 604 may be a read-only memory (read-only memory, ROM) or other types of static storage devices capable of storing static information and/or instructions, or may be a random access memory (random access memory, RAM) or may Other types of dynamic storage devices that store information and/or instructions can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD- ROM) or other optical disc storage, optical disc storage, magnetic disk storage media, or other magnetic storage devices, including compact discs, laser discs, compact discs, digital versatile discs, Blu-ray discs, etc.

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

In an example, the processor 601 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 6 .

As an optional implementation manner, the communications apparatus 600 includes multiple processors, for example, in addition to the processor 601 in FIG. 6 , it may further include a processor 607 .

As an optional implementation manner, the communication apparatus 600 may further include an output device 605 and an input device 606 . The input device 606 may be a keyboard, a mouse, a microphone, or a joystick, and the output device 605 may be a display screen, a speaker, and the like.

It should be noted that the communication device 600 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system or a device having a structure similar to that shown in FIG. 6 . In addition, the composition structure shown in FIG. 6 does not constitute a limitation to the communication device. In addition to the components shown in FIG. 6, the communication device may include more or less components than those shown in the illustration, or combine certain components , or different component arrangements.

In the embodiment of the present application, the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.

The following describes the random access method provided by the embodiment of the present application with reference to the communication system shown in FIG. 5 . Among them, each device in the following embodiments may have the components shown in Figure 6, and the actions and terms involved in each embodiment may refer to each other, the name of the message or the parameter name in the message interacted between the devices in each embodiment etc. are just examples, and other names may also be used 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 a specific order of objects. The attributes of different objects represented by " are not limited.

FIG. 7 is a flow chart of a random access method provided in an embodiment of the present application. As shown in FIG. 7, the method may include:

Step 701: The access network device sends at least one SSB. Correspondingly, the first terminal receives at least one SSB from the access network device.

Wherein, the first terminal may be any terminal in FIG. 5 , such as terminal 1 or terminal 2 . The first terminal belongs to the first type of terminal, and the first type of terminal may be a redcap terminal or a non-redcap terminal, wherein the non-redcap terminal may also be called a normal capability (normal) terminal or an ordinary (legacy) terminal, etc., without limitation. The first terminal may periodically detect the SSB sent by the surrounding access network devices. The access network device may be any access network device around the first terminal. The access network device may periodically send at least one SSB to the cells it covers.

Wherein, the relevant description of the SSB can refer to the above, and will not be described in detail. The number of SSBs sent by the access network device to the cell can be configured as required, for example, 2 or 4 SSBs can be configured according to the area of the cell, without limitation.

Step 702: the first terminal selects the first RO corresponding to the first SSB and the preamble corresponding to the first RO.

Wherein, the first SSB may be included in at least one SSB sent by the access network device, for example, the first SSB may be the SSB with higher/highest signal quality among at least one SSB, and the signal quality of the first SSB satisfies the random access condition Wait. For example, as shown in Figure 1, there are four SSBs: SSB0-SSB3, the first terminal can measure the signal quality of these four SSBs, and find that the signal quality of SSB2 is the highest and meets the random access conditions, then use SSB2 as the first SSB .

Wherein, the first RO corresponding to the first SSB may be a randomly selected RO among the ROs corresponding to the first SSB. The RO corresponding to the first SSB may be included in the RO resource of the first type of terminal, the RO resource of the first type of terminal may include one or more ROs allocated to the first type of terminal, and the RO resource of the first type of terminal is related to at least One SSB corresponds, and the RO resources of the first type of terminal include ROs corresponding to all SSBs in at least one SSB, so as to ensure that each SSB has available ROs. The corresponding relationship between SSB and RO is as described above, which can be that K SSBs correspond to one RO, or 1/K SSBs correspond to one RO, K can be an integer greater than or equal to 1, and the corresponding relationship between SSB and RO (including K The value of SSB and/or RO corresponding to SSB, etc.) may be indicated to the first terminal by the access network device, for example, the corresponding relationship between SSB and RO may be carried in a system message and sent to the first terminal.

Wherein, the preamble corresponding to the first RO may be a preamble randomly selected from the preamble set corresponding to the first RO. The preamble set corresponding to the first RO may include one or more preambles allocated to the first type of terminal to use on the first RO. The access network device may indicate the preamle set corresponding to the first RO to the first terminal. For example, the access network device may indicate the preamle set corresponding to the first RO to the first terminal through a system message.

Step 703: 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.

Wherein, the first message may carry the preamble selected in step 702 . When the random access is 4-step RA, the first message may be Msg1. When the random access is 2-step RA, the first message may be MsgA. In addition to carrying the preamble, MsgA may also include a physical uplink shared channel (PUSCH) associated with the preamble, which may be Include upstream data and/or other information.

Further, the method shown in FIG. 7 may further include: the access network device receives the first message from the first RO, calculates a radio network temporary identity (radio network temporary identity, RNTI) according to the first RO, and uses the RNTI to scramble the downlink control information (downlink control information, DCI), sending the scrambled DCI to the first terminal, and sending a response message corresponding to the first message at the time-frequency resource position indicated by the DCI. Correspondingly, the first terminal receives the scrambled DCI from the access network device, determines the RNTI according to the first RO, descrambles the scrambled DCI according to the RNTI, and after the scrambled DCI is descrambled successfully, according to the descrambled Receive the response message corresponding to the first message at the time-frequency resource position indicated by the scrambled 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.

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, the access network device receives Msg3, and sends the Msg3 to the first terminal Msg4.

Specifically, the first terminal may receive the scrambled DCI from the access network device and the response message corresponding to the first message on the initial BWP of the first type of terminal. The first terminal may send the first Msg3 to the access network device and receive the Msg4 from the access network device on the initial BWP of the first type of terminal.

It should be understood that, in this embodiment of the present application, if the first RO is located outside the initial BWP of the first type of terminal, for example, in the initial BWP of the second type of terminal, the first terminal receives information from the initial BWP of the first type of terminal Before the scrambled DCI of the access network device and the response message corresponding to the first message, the method further includes: the first terminal switches the operating frequency from the operating frequency corresponding to the first RO to the initial BWP of the first type of terminal, such as The first terminal needs to start detecting the response information corresponding to the first message after the T _return time after the end time of the first RO, where T _return is the frequency conversion time, and T _return can be set as required without limitation. If the first RO is located in the initial BWP of the first type of terminal, the first terminal does not need to switch the working frequency.

Based on the method shown in FIG. 7 , the first terminal may send a preamble on the first RO, access the cell, establish an RRC connection with the access network device, and perform data transmission through the access network device.

In this embodiment of the present application, the RO resource of the first type of terminal may be located in the initial BWP of the first type of terminal, or part or all of the RO resources of the first type of terminal are located outside the initial BWP of the first type of terminal. All the ROs in the RO resources of the first type of terminals are exclusively shared by the first type of terminals, or by a random access method (4-step RA or 2-step RA); or in the RO resources of the first type of terminals Some or all of the RO resources are shared by multiple types of terminals including the first type of terminals, and/or, some or all of the RO resources of the first type of terminals are shared by multiple random access methods, such as by 4-step RA Sharing with 2-step RA, etc., and/or part or all of the RO resources of the first type of terminal are shared by multiple SSBs, etc. No restrictions.

For ease of description, in this embodiment of the application, a type of shared RO may be called a shared RO, and shared ROs may have different sharing methods, such as sharing of different types of terminals, and/or sharing of random access methods. Shared ROs can be regarded as different RO sets, and a type of exclusive RO can be called an exclusive RO, and this type of RO can also be regarded as a RO set. That is, the ROs included in the RO resources of the first type of terminals can be divided into multiple RO sets according to the sharing mode or exclusive sharing of the ROs included in the RO resources of the first type of terminals, and the terminal types and/or The random access method can be different. For example, the RO resources of the first terminal include the first RO set and the second RO set. The ROs included in the first RO set are exclusively shared by the first type of terminals, and the ROs included in the second RO set are shared by the first type of terminals and the second type of terminals. shared. Exemplarily, the first type of terminal is a redcap terminal, and the second type of terminal is a non-redcap terminal. Or, the ROs included in the first RO set can be shared by 4-step RA and 2-step RA, and the ROs included in the second RO set are only used for 4-step RA, etc.

In this embodiment of the present application, different RO sets correspond to different RO configuration information, preambles corresponding to different RO sets are configured separately, and RO configuration information corresponding to each RO set is independently configured. For example, in the case that different types of terminals share ROs, in order to distinguish the types of terminals that initiate random access, different preambles may be configured for different types of terminals through the RO configuration information of the shared RO. And/or, in the case of 4-step RA and 2-step RA sharing RO, in order to distinguish whether the initiated random access is 4-step RA or 2-step RA, the RO configuration information of the shared RO can be configured in different ways RA configures different preambles. As for the exclusive RO, because the RO is only exclusively shared by one type of terminal or one type of RA, there is no need to distinguish the preamble indicated by the RO configuration information, that is, the preamble indicated by the RO configuration information corresponding to the shared RO and the exclusive RO is Differently, the RO configuration information of the two needs to be configured separately.

Before step 701 is executed, the access network device may send a system message to the first terminal, and the system message may carry the configuration information of the initial BWP of the first type of terminal and the RO configuration corresponding to the RO set included in the RO resources of the first type of terminal information. The RO configuration information may be carried in the initial BWP configuration information. If the RO resource of the first type of terminal includes an RO set, the configuration information of the initial BWP may include one RO configuration information; if the RO resource of the first type of terminal includes multiple RO sets, the configuration information of the initial BWP may include For multiple RO configuration information, one RO set corresponds to one RO configuration information, and the RO configuration information corresponding to different RO sets is different.

In the embodiment of the present application, a mask (mask) may be used to indicate the RO set. This mask may also be referred to as an RO mask or the like. Where there is a corresponding relationship between the mask and the RO set, the corresponding relationship can be pre-configured, and the corresponding relationship can be in the form of a table or an array. In a possible design, a corresponding mask is designed for each RO set. In yet another possible design, a corresponding mask is designed for some RO sets, and ROs not indicated by the mask are located in other RO sets.

Take the correspondence between the mask and the RO set as an example in the form of a table. For example, Table 1 shows the correspondence between the RO set 1 and the mask. As shown in Table 1, when the mask is 1, it indicates RO set 1 includes RO0. When the mask is 2, RO set 1 includes RO1; when the mask is 3, it indicates that RO set 1 includes RO2; when the mask is 4, it indicates that RO set 1 includes RO3; when the mask is 5, it indicates that RO set includes RO0 and RO2 ; When the mask is 6, it indicates that the RO set includes RO1 and RO3 and so on. The ROs not indicated by the mask in Table 1 may be in other RO sets, such as in RO set 2, etc., without limitation. It should be understood that Table 1 is only an exemplary table, and in addition to the RO sets shown in Table 1, other RO sets and their corresponding masks may also be included, without limitation.

At this point, assume that RO resources include RO0-RO3, where RO0 belongs to RO set 1, RO2-RO3 belongs to RO set 2, RO set 1 corresponds to RO configuration information 1, and RO set 2 corresponds to RO configuration information 2, then indicate RO according to Table 1 The mask of set 1 is 1, and different RO configuration information corresponding to different RO sets carried in the initial BWP configuration information includes: {mask 1 (indicating that RO set 1 includes RO0), RO configuration information 1}, {RO set 2 , RO configuration information 2}, where RO set 2 includes RO1-RO3 not indicated by mask 1; after receiving the initial BWP configuration information, the terminal can determine that RO0 corresponds to RO configuration information 1, and RO1-RO3 corresponds to RO configuration in combination with Table 1 information2.

Table I

掩码(mask) mask		RO集合1RO collection 1
00	全部(All)ROAll (All) RO
11	RO0 RO0
22	RO1 RO1
33	RO2RO2
44	RO3RO3
55	RO0,RO2RO0,RO2
66	RO1,RO3RO1,RO3
77	无none

In this embodiment of the present application, the configuration information of the initial BWP may include one or more of the bandwidth of the initial BWP, the initial frequency domain position of the initial BWP, and other information. The starting frequency domain position of the initial BWP may refer to the offset between the starting frequency domain of the initial BWP (or the frequency domain unit with the lowest frequency) and the starting frequency domain of the system bandwidth, and the offset may be greater than or equal to 0 integer. 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 0PRB .

In the embodiment of this application, for a type of terminal, the RO configuration information corresponding to an RO set of this type of terminal can be used to indicate the preamble allocated to this type of terminal in the preamble corresponding to the RO set, and can also be used to indicate the Time-frequency information of the RO set. Alternatively, the RO configuration information corresponding to the RO set may include information indicating the preamble allocated to this type of terminal in the preamble corresponding to the RO set, and may also include information indicating the time-frequency information of the RO set . Different RO sets correspond to different RO configuration information. In other words, the RO configuration information corresponding to different RO sets is configured independently, and the division of preambles indicated by different RO sets may be different. The time-frequency information of different RO sets may be the same or different. When the time-frequency information of different RO sets is different, the RO configuration information corresponding to the RO set can indicate the time-frequency information corresponding to the RO set and the preamble allocated to this type of terminal in the preamble corresponding to the RO set, that is, for different RO sets, the Time-frequency information and preamble are configured separately. When the time-frequency information corresponding to different RO sets is the same, the different RO configuration information corresponding to different RO sets only indicates the preamble allocated to the terminal. At this time, the system message can also carry the time-frequency information shared by the RO sets and indicate the RO set The mask, that is, for different RO sets, the time-frequency information can be shared, and the preamble is configured separately, saving signaling overhead.

It should be understood that the embodiment of the present application does not limit the naming of the RO configuration information, and may also be named by other names. In addition, in this embodiment of the present application, the time-frequency information corresponding to the RO set and the information indicating the preamble allocated to this type of terminal in the preamble corresponding to the RO set may be carried in the same configuration information (such as RO configuration information), or may carry In different configuration information, there is no limitation.

Taking the RO set of the first type of terminal including the first RO set and the second RO set as an example, when the time-frequency information corresponding to the first RO set and the second RO set are different, the system message carries {the first RO set, RO Configuration information}, {second RO set, RO configuration information}, wherein the RO configuration information corresponding to the first RO set indicates the time-frequency information of the first RO set and the preamble corresponding to the first RO set is allocated to the first type of terminal for use the preamble; the RO configuration information corresponding to the second RO set indicates the time-frequency information of the second RO set and the preamble allocated to the first type of terminal in the preamble corresponding to the second RO set. When the first RO set and the second RO set correspond to the same time-frequency information, the system message carries the RO configuration information corresponding to the first RO set, the RO configuration information corresponding to the second RO set, and the mask used to indicate the first RO set. code and the time-frequency information, wherein the RO configuration information corresponding to the first RO set indicates the preamble allocated to the first type of terminal in the preamble corresponding to the first RO set, and the RO configuration information corresponding to the second RO set indicates the second RO set The preamble assigned to the first type of terminal in the corresponding preamble.

It should be understood that the "preamble allocated to the first type of terminal" described in this application may also be described as either "a preamble allocated to the first type of terminal for random access" or "a preamble available to the first type of terminal preamble", or "preamble corresponding to the first type of terminal", etc., are not limited.

In the embodiment of the present application, the time-frequency information of the RO set may be used to indicate the time-frequency position of the RO set. Specifically, the time-frequency information of the RO set may include a start frequency domain position of the RO set, a time domain position of the RO set, and a frequency division multiplexing coefficient. The time domain position of the RO set may refer to the time resource position occupied by the RO in the RO set within one sending period. As shown in Figure 3a, the time-domain locations of RO sets are slot10, slot30, slot50 and slot70. The frequency division multiplexing coefficient may refer to the number of ROs configured on different frequency domain units at the same time. The frequency division multiplexing coefficient can be configured as an integer, such as one of 1, 2, 4, 8, and so on.

In the embodiment of this application, the starting frequency domain position of an RO set of a type of terminal may refer to the starting frequency of the RO with the lowest frequency in the RO set (which may be called the starting RO) from the initial BWP of this type of terminal offset between. The starting frequency of the initial BWP may refer to PRB No. 0 with the lowest frequency in the initial BWP. That is, the starting frequency domain position of the RO set is the relative position of the starting RO in the RO set relative to PRB 0 of the initial BWP. In the present application, the offset may be alternatively described as a frequency domain interval or a difference or an offset value, etc., and the offset may be an integer greater than or equal to 0, or the offset may be an integer less than 0.

In a possible design, the access network device can calculate the offset between the initial RO and the initial frequency of the initial BWP, and the offset can be carried in the RO configuration information and indicated to the terminal, and the terminal can The offset and the initial BWP initial frequency domain position indicated by the initial BWP configuration information are calculated to obtain the initial frequency domain position of the RO set. Specifically, reference may be made to what is shown in FIG. 8a or FIG. 8b or FIG. 8c.

In yet another possible design, the initial frequency domain position of the RO set and the initial frequency domain position of the terminal's initial BWP, the system bandwidth, and the offset of the initial RO of the RO set relative to the initial frequency of the system bandwidth ( That is, there is an association between the relative position of the starting RO in the RO set relative to the starting point of the system bandwidth). For example, the initial frequency domain position of the RO set meets the preset modulo between the initial frequency domain position of the terminal's initial BWP, the system bandwidth, and the offset of the initial RO of the RO set relative to the initial frequency of the system bandwidth. Formula: mod(F ₁ +F _init ,B _Wsys )=The relative position of the initial RO in the RO set relative to the starting point of the system bandwidth, where F ₁ is the initial frequency domain position of the RO set, and _Finit is the terminal of this type The starting frequency domain position of the initial BWP, B _Wsys is the system bandwidth. After receiving the starting frequency domain position of the RO set indicated by the access network device, the terminal can calculate the relative position of the starting RO in the RO set relative to the starting point of the system bandwidth according to the formula mod(F ₁ +F _init ,B _Wsys ) . In this application, the relative position of the starting RO in the RO set relative to the starting point of the system bandwidth can be replaced with the actual frequency position of the starting RO. Specifically, reference may be made to that shown in FIG. 8d.

For the time-frequency information of the RO resources of the first type of terminal, such as the location of the resource of the first type of terminal (whether it is in the initial BWP of the first type of terminal, etc.), the RO resources included in the first type of terminal are multiplied Describe the situation of sharing the same type of terminal and/or multiple types of random access methods, and the corresponding situation of RO and SSB included in the RO resource of the first type of terminal:

In a possible design, each type of terminal is allocated an independent initial BWP and RO resource at the granularity of the terminal type, and the RO resource is included in the initial BWP. The access network device may send a system message for each type of terminal, the system message may include initial BWP configuration information of this type of terminal, and the initial BWP configuration information may include RO configuration information corresponding to RO resources of this type of terminal. That is, initial BWP configurations and RO configuration information of various types of terminals are independent of each other. In this way, the terminal type of the terminal initiating random access can be distinguished by using ROs in different initial BWPs, so that the access network device can perform subsequent operations according to the terminal type.

For example, taking the first type of terminal and the second type of terminal as an example, corresponding to the first type of terminal, the initial BWP and RO resources of the first type of terminal are allocated, and the RO resources of the first type of terminal are included in the initial BWP of the first type of terminal. For the second type of terminal, allocate the initial BWP and RO resources of the second type of terminal, the RO resource of the second type of terminal is included in the initial BWP of the second type of terminal, the initial BWP of the first type of terminal and the initial BWP of the second type of terminal The BWPs are non-overlapping (or called independent). In this way, ROs in different initial BWPs can be used to distinguish whether the terminal initiating random access belongs to the first type of terminal or the second type of terminal, so that the access network device can perform subsequent operations according to the terminal type.

The initial BWP of the first type of terminal and the RO resource of the first type of terminal may be indicated by the access network device to the first type of terminal, for example, the access network device may send a system message to the first type of terminal (such as the first terminal), The system message includes RO configuration information corresponding to the RO resources of the first terminal, and initial BWP configuration information. Optionally, the RO configuration information is carried in the initial BWP configuration information. Similarly, for the second type of terminal, the access network device may refer to this method to indicate the initial BWP of the second type of terminal and the RO resource of the second type of terminal to the second type of terminal.

It should be understood that in this possible design, the RO resources included in the RO resource of the first type of terminal are only used by the first type of terminal, and are ROs specially configured for the first type of terminal to perform random access. At this time, the ROs included in the RO resource of the first type of terminal can be regarded as a set of ROs or a group of ROs configured for use by the first type of terminal. The RO configuration information corresponding to the RO resources of the first terminal may be replaced with RO configuration information corresponding to an RO set, and the RO configuration information corresponding to the RO resources of the first terminal may be one RO configuration information.

Taking the first type of terminal as a redcap terminal and the second type of terminal as a non-redcap terminal as an example, as shown in Figure 8a, the system bandwidth includes the initial BWP of the redcap terminal and the initial BWP of the non-redcap terminal, that is, the access network device configures a A separate initial BWP is given to the redcap terminal, where the initial BWP of the redcap terminal does not overlap with the initial BWP of the non-redcap terminal. As shown in Figure 8a, the initial BWP of the redcap terminal and the initial BWP of the non-redcap terminal are respectively configured with RO resources. In this way, after the redcap terminal reads the system message, it can learn the location of the initial BWP of the redcap terminal and the configured RO resources. Then the redcap terminal can send the preamble in the RO in the initial BWP of the redcap terminal. The access network device can confirm from the used RO that it is the redcap terminal that sends the preamble, which solves the terminal type identification problem of the redcap terminal. In Figure 8a, the initial frequency domain of the RO of the redcap terminal overlaps with the initial frequency domain of the initial BWP of the redcap terminal, and the RO resource of the redcap terminal is exclusively shared by the redcap terminal, and the RO resource of the redcap terminal can be regarded as an RO set, the starting frequency domain position of the RO set is 0 PRB.

In another possible design, each type of terminal is assigned an independent initial BWP, but multiple types of terminals are configured with a common RO, that is, multiple types of terminals can share the same RO to improve RO resource utilization. . For example, part or all of RO resources in the RO resources of the first type of terminal may be configured for use by other types of terminals in addition to being configured for use by the first type of terminal, for example, may also be configured for use by the second type of terminal. That is, part of or all ROs in the RO resources of the first type of terminal may be shared by multiple types of terminals including the first type of terminal. In this way, the time-frequency positions of the ROs of the first type of terminals and the ROs of other types of terminals overlap to realize the sharing of ROs, which can reduce the number of allocated ROs and improve the utilization rate of RO resources.

In the first scenario of this possible design, taking the first type of terminal as a redcap terminal and the second type of terminal as a non-redcap terminal as an example, the RO resource of the first type of terminal can be located outside the initial BWP of the first type of terminal, for example In the initial BWP of the second type of terminal, the initial BWP of the first type of terminal and the initial BWP of the second type of terminal do not overlap and are independent of each other. In this way, although an independent initial BWP is set for the redcap terminal, RO sharing between the degraded terminal and the non-redcap terminal can be realized, allowing the RO configuration of the redcap terminal to be outside the initial BWP of the redcap terminal, increasing the flexibility of configuration. It should be understood that in this manner, since the first RO is located outside the initial BWP of the first type of terminal, for example, it is located in the initial BWP of the second type of terminal, after the redcap terminal sends the first message carrying the preamble on the first RO, it can Switch the working frequency to the initial BWP of the redcap terminal, receive the response message corresponding to the first message on the initial BWP of the redcap terminal, and perform subsequent operations. At this time, the first terminal needs to start detecting the response information corresponding to the first message after T _retune after the end time of the first RO, where T _retune is the frequency conversion time.

For example, as shown in Figure 8b, the bandwidth of the system bandwidth of the access network device is 200 PRB, the initial frequency domain position of the configured initial BWP of the non-redcap terminal is 100 PRB in the system bandwidth, and the initial BWP of the redcap terminal is configured The starting frequency domain position of the BWP is located at 20PRB of the system bandwidth. The access network device is actually configured with only one group of ROs in this cell. The initial frequency domain location is located at 110 PRB of the system bandwidth, and the frequency division multiplexing coefficient is 8. All ROs are located within the initial BWP of non-redcap terminals. Then, in the RO configuration information of the non-redcap terminal in the system message, the access network device will notify that the starting frequency domain position of the RO is 10 PRB. In the RO configuration information of the redcap terminal in the system message, it will be notified that the starting frequency domain position of the RO is 110PRB-20PRB=90PRB. At this time, the RO is outside the initial BWP bandwidth of the redcap terminal. In this way, although two initial BWPs are configured, sharing of ROs can be realized.

For another example, as shown in Figure 8c, the bandwidth of the system bandwidth of the access network device is 200 PRB, the initial frequency domain position of the configured initial BWP of the non-redcap terminal is 10 PRB in the system bandwidth, and the configured redcap terminal The initial frequency domain position of the initial BWP is located at 150 PRB of the system bandwidth. The access network equipment is actually configured with only one set of ROs in this cell. Its initial frequency domain location is located at 20 PRB of the system bandwidth, and the frequency division multiplexing coefficient is 8. All ROs are located within the initial BWP of non-redcap terminals. Then, in the RO configuration information of the non-redcap terminal in the system message, it is notified that the starting frequency domain position of the RO is 10 PRB. In the RO configuration information of the redcap terminal in the system message, it is notified that the initial frequency domain position of the RO is 20PRB-150PRB=-130PRB, indicating that the frequency domain position of the RO is 130PRB lower than the initial BWP frequency domain position of the redcap terminal. According to such a configuration, the RO is outside the initial BWP bandwidth of the redcap terminal. In this way, although the access network device is configured with two initial BWPs, the sharing of ROs can be realized.

For another example, as shown in Figure 8d, the bandwidth of the system bandwidth of the access network device is 200 PRB, the initial frequency domain position of the initial BWP of the configured non-redcap terminal is 10 PRB in the system bandwidth, and the configured redcap terminal The initial frequency domain position of the initial BWP is located at 150 PRB of the system bandwidth. The access network device is actually configured with only one group of ROs in this cell. The initial frequency domain location is located at 20 PRB of the system bandwidth, and the frequency division multiplexing coefficient is 8. All ROs are located within the initial BWP of non-redcap terminals. Then in the system message, in the RO configuration information of the non-redcap terminal, it is notified that the starting frequency domain position of the RO is 10 PRB. In the RO configuration information of the redcap terminal, according to the direction indicated by the arrow in Figure 8d, the initial frequency domain position of the notified RO is (50PRB+20PRB)=70PRB. At this time, the initial BWP position of the redcap terminal and the system Bandwidth, the actual frequency position of the RO is calculated by the modulo formula, for example, according to mod(150+70, 200)=20, where 150 is the initial BWP starting frequency domain position of the redcap terminal (under the system bandwidth coordinates), and 70 is the RO Relative to the offset of the initial BWP starting position of the redcap terminal, 200 is the system bandwidth, and the frequency domain position of the RO is calculated to be 20 PRB (under the system bandwidth coordinates). At this time, the RO is outside the initial BWP bandwidth of the redcap terminal. In this way, although the access network device is configured with two initial BWPs, the sharing of ROs can be realized.

In the second scenario of this possible design, taking the first type of terminal as a redcap terminal and the second type of terminal as a non-redcap terminal as an example, part or all of the RO resources of the first type of terminal can be located in the first type of terminal In the initial BWP, the initial BWP of the first type of terminal overlaps with the initial BWP of the second type of terminal, for example, the initial BWP of the first type of terminal is included in the initial BWP of the second type of terminal. In this way, sharing the initial BWP between redcap terminals and non-redcap terminals can not only improve the resource utilization of the initial BWP, but also realize RO sharing between degraded terminals and non-redcap terminals and improve RO utilization. The frequency is switched during the process of initiating random access.

In the second scenario, all ROs in the overlapping portion of the initial BWP of the first type of terminal and the initial BWP of the second type of terminal may cover all SSBs in at least one SSB, as shown in Figure 9a. Or all the ROs in the overlapping portion of the initial BWP of the first type of terminal and the initial BWP of the second type of terminal may cover part of the SSB in at least one SSB, as shown in FIG. 9b. When some SSBs are covered, in order to ensure that each SSB has an available RO, ROs corresponding to the remaining SSBs can also be configured in the initial BWP of the first type of terminal, as shown in Figure 9c.

For example, as shown in Figure 9a, the access network device is configured with the initial BWP of the non-redcap terminal and the initial BWP of the redcap terminal respectively, the initial PRB number of the initial BWP of the non-redcap terminal is 100 (under the system bandwidth coordinates), and the redcap terminal The starting PRB number of the terminal's initial BWP is 110 (under system bandwidth coordinates). In the actual system, only one group of ROs is configured, and its initial frequency domain position is 120 PRB (under system bandwidth coordinates), and the frequency division multiplexing coefficient is 4. All ROs are not only located within the initial BWP of non-redcap terminals, but also within the initial BWP of redcap terminals.

The RO configuration information of the non-redcap terminal indicates that the starting frequency domain position of the RO is 20 PRB (note that at this time, the lowest PRB of the initial BWP of the non-redcap terminal, that is, PRB100 in the system coordinate system, is used as the starting point), while the RO of the redcap terminal The configuration information indicates that the starting frequency domain position of the RO is 10 PRB (note that at this time, the lowest PRB of the initial BWP of the redcap terminal is used as the starting point, that is, PRB110 under the system bandwidth coordinates), then the actual position of the RO corresponding to the two initial BWPs it's the same. In this way, although there is an independent initial BWP, the effect of sharing the RO between the redcap terminal and the non-redcap terminal can still be achieved, and the RO is located in the two initial BWPs at the same time. Assuming that the SSB of the redcap terminal includes SSB0-SSB3, as shown in Figure 9a, all SSBs of the redcap terminal can use shared ROs, and one SSB corresponds to two ROs, ensuring that all SSBs of the redcap terminal have usable ROs.

For another example, as shown in Figure 9b, the access network device is respectively configured with the initial BWP of the non-redcap terminal and the initial BWP of the redcap terminal, and the initial PRB number of the initial BWP of the non-redcap terminal is 100 (under the system bandwidth coordinates), The starting PRB number of the initial BWP of the redcap terminal is 110 (under system bandwidth coordinates). In the actual system, only one group of ROs is configured, and its initial frequency domain position is 120 PRB (under the system bandwidth coordinates), and the frequency division multiplexing coefficient is 8. All ROs are located within the original BWP of the non-redcap terminal. However, only the 4 ROs with lower frequency are located in the initial BWP of the redcap terminal at the same time. This is because the bandwidth of the initial BWP of the redcap terminal is limited, and 8 ROs of frequency division multiplexing cannot be placed. At this time, the RO configuration information of the non-redcap terminal indicates that the RO starting frequency domain position is 20 PRB (note that at this time, the lowest PRB of the initial BWP of the non-redcap terminal, that is, PRB100 in the system coordinate system, is used as the starting point), and indicates The frequency division multiplexing factor is 8. The RO configuration information of the redcap terminal indicates that the RO starting frequency domain position is 10PRB (note that at this time, the lowest PRB of the initial BWP of the redcap terminal is used as the starting point, that is, PRB110 under the system bandwidth coordinates), and indicates the frequency division multiplexing coefficient for 4. Then the redcap terminal and the non-redcap terminal can share the 4 ROs with lower frequency, and the 4 ROs with higher frequency are used solely by the non-redcap terminal. That is, the RO located in the initial BWP of the redcap terminal can be shared by the redcap terminal and the non-redcap terminal, while the RO located outside the initial BWP of the redcap terminal, and the RO located in the initial BWP of the non-redcap terminal are not shared/used by the redcap terminal.

In this embodiment of the application, according to the configuration of the non-redcap terminal, the ROs corresponding to some SSBs may only be in the initial BWP of the non-redcap terminal, but not in the initial BWP of the redcap terminal. For example, as shown in FIG. 9b, it is assumed that the SSB of the redcap terminal includes SSB0-SSB3, and the corresponding relationship between SSB and RO is shown in FIG. 9b. If the SSB of the redcap terminal can only use the RO in its initial BWP to initiate random access, as shown in Figure 9b, according to the configuration of the redcap terminal, the ROs corresponding to SSB1 and SSB3 are only in the initial BWP of the redcap terminal, and only realize Some SSBs of redcap terminals have ROs available. At this time, only SSB0 and SSB2 of the SSBs of the redcap terminal have usable SSBs, but there are no usable ROs for SSB1 and SSB3, and the redcap terminal cannot select the ROs corresponding to SSB1 and SSB3 to send the preamble. To solve this problem, in this embodiment of the present application, in the case that the RO located in the initial BWP of the first type of terminal and shared by the first type of terminal and the second type of terminal corresponds to a part of the SSB of the first type of terminal, it can be In the initial BWP of the first type of terminal, other SSBs of the first type of terminal are independently configured with ROs (including the RO and the preamble corresponding to the RO), and the independently configured RO is exclusively shared by other SSBs of the first type of terminals.

For example, as shown in Figure 9c, the access network device is configured with the initial BWP of the non-redcap terminal and the initial BWP of the redcap terminal respectively, the initial PRB number of the initial BWP of the non-redcap terminal is 100 (under the system The starting PRB number of the terminal's initial BWP is 110 (under system bandwidth coordinates). For non-redcap terminals, only one set of RO is configured, its starting frequency domain position is 120PRB (under the system bandwidth coordinates), and the frequency division multiplexing coefficient is 8. All ROs are located within the initial BWP of non-redcap terminals, but only 4 ROs with lower frequencies are also located within the initial BWP of redcap terminals. This is because the bandwidth of the initial BWP of redcap terminals is limited and 8 frequency divisions cannot be placed. Multiplexed RO. In order to ensure that redcap terminals can use all SSBs, when configuring ROs for redcap terminals, divide them into two groups and configure them separately. In the system message, the first group of ROs (or called the first RO set) is defined by the time domain position, the starting frequency domain position, and the frequency division multiplexing coefficient. In the corresponding relationship between SSB and RO, SSB0 and SSB2 are indicated. Using this first set of ROs, each SSB is mapped onto 4 consecutive ROs. In the system message, the second group of ROs (or called the second RO set) is also defined by the time domain position, the starting frequency domain position, and the frequency division multiplexing coefficient. In the corresponding relationship between SSB and RO, SSB1, SSB3 uses the second group of ROs, and each SSB is mapped to 2 consecutive ROs. In this way, the ROs corresponding to SSB0 and SSB2 are shared by the initial BWP of redcap terminals and the initial BWP of non-redcap terminals. For non-redcap terminals and redcap terminals, the ROs corresponding to SSB0 and SSB2 can have an RO configuration information instead of redcap The ROs corresponding to SSB1 and SSB3 of the terminal, and the ROs corresponding to SSB1 and SSB3 of the redcap terminal can have their own RO configuration information, so that the redcap terminal can select the corresponding beam from all SSBs for subsequent services, and solve the problem of partial SSB correspondence The RO is located outside the initial BWP of the redcap terminal.

In the embodiment of the present application, in the case where the first type of terminal shares the RO with the second type of terminal, the preamble allocated to the first type of terminal in the preamble corresponding to the shared RO may be different from the preamble allocated to the second type of terminal , may also partially overlap, without limitation. Taking the first type of terminal as an example, the preamble allocated to the first type of terminal can be indicated through any of the following situations. Similarly, for other types of terminals, such as the second type of terminals, the preamble can be assigned to the second type of terminals by referring to the following manner, which will not be described in detail.

Case 1: In the RO set, each RO corresponds to N groups of SSBs and is shared by N groups of SSBs. A group of SSBs includes M SSBs, where M and N are integers greater than or equal to 1, and the preambles corresponding to different SSBs are different. For the mth SSB in the nth group, the number of the starting preamble used in the preamble corresponding to the RO set is based on M, N, R, Q and

Sure. For example, the number of the initial preamble can satisfy the following formula, and the RO configuration information corresponding to the RO set can carry M, N, R, Q, and

The terminal can calculate the number of the starting preamble assigned to the mth SSB in the nth group according to these parameters and formula (1):

Among them, in the formula (1), R is the total number of preambles used for other types of terminals except the first type of terminals in the preamble corresponding to the SSB group, and R is an integer greater than or equal to 0. For example, if the RO set is selected by the second If one type of terminal is shared with other types of terminals, then R is an integer greater than 0. If the RO set is used solely by the first type of terminal, then R is equal to 0. At this time, formula (1) can be

The value range of n is [0, N-1], and N is an integer greater than or equal to 1.

is an integer greater than 1. The value range of m is [0, M-1], and M is an integer greater than or equal to 1. Q is the total number of preambles allocated to the first type of terminal among the preambles corresponding to the SSB group.

It should be understood that the formula (1) is only an exemplary description, and the formula (1) can be applied to the number of R preambles allocated to terminals of other types except the terminal of the first type. , and the number of the start preamble allocated to the first type of terminal is continuous with the number of the end preamble allocated to other types of terminals except the first type of terminal. Optionally, if the number of the preamble allocated to the first type of terminal is after the number of R preambles allocated to other types of terminals except the first type of terminal, and the starting number allocated to the first type of terminal The number of the preamble is discontinuous with the number of the end preamble allocated to terminals of other types except the first type of terminal, and there is a certain interval, then the above formula (1) can be transformed into

The offset value (offset) may refer to the interval between the start preamble of the first type of terminal and the end preamble of other types of terminals.

In addition, in case 1, corresponding to an RO shared by different SSBs, the preambles assigned to different SSBs in the preamble corresponding to the RO may be different or overlapped, without limitation.

For example, as shown in Figure 10a, the access network device is configured with the initial BWP of the non-redcap terminal and the initial BWP of the redcap terminal respectively. The initial PRB number of the non-redcap terminal is 100 PRB (under the system bandwidth coordinates), and the initial The starting PRB number of the BWP is 110 PRB (under system bandwidth coordinates). In the system message of the initial BWP of the non-redcap terminal, the initial frequency domain position of the RO is 20 PRB, the frequency division multiplexing coefficient is 8, and each SSB is mapped to 4 consecutive ROs. All ROs are located within the original BWP of the non-redcap terminal. The RO is configured in the system message of the initial BWP of the redcap terminal, its initial frequency domain position is 10PRB, the frequency division multiplexing coefficient is 4, and each SSB group is mapped to 4 consecutive ROs. In this way, the four ROs with lower frequencies are shared ROs of redcap terminals and non-redcap terminals.

For the redcap terminal, the SSBs are divided into two SSB groups, each group contains M=2 SSBs, group 1 is {SSB0, SSB1}, and group 2 is {SSB2, SSB3}. In the shared RO, in order to distinguish between redcap terminals and non-redcap terminals, redcap terminals and non-redcap terminals need to use different preambles for access. The number of the preamble used by the redcap terminal is arranged after the number of the preamble of the non-redcap terminal. In order to let the redcap terminal know the location of the preamble it can use, the system message broadcasts the following parameters: M=2, N=1, R=24, Q=16 and

In the shared RO, the redcap terminal can calculate the starting position of the preamble it can use (that is, the number of the starting preamble) according to the parameters carried in the system message and the above formula (1).

For example, if the redcap terminal selects SSB0, the starting position of the preamble that can be used is:

Starting from the preamble numbered 24, consecutive Q/M=16/2=8 preambles can be used to select the redcap terminal of SSB0 for random access. If the redcap terminal selects SSB1, the starting position of the preamble it can use is:

Starting from the preamble numbered 32, consecutive Q/M=16/2=8 preambles can be used to select the redcap terminal of SSB1 for random access.

For another example, as shown in Figure 10b, the access network device is respectively configured with the initial BWP of the non-redcap terminal and the initial BWP of the redcap terminal, and the initial PRB number of the initial BWP of the non-redcap terminal is 100 PRB (under the system bandwidth coordinates), The starting PRB number of the initial BWP of the redcap terminal is 110 PRB (under system bandwidth coordinates). In the system information of the initial BWP of the non-redcap terminal, the initial frequency domain position of the RO is 20 PRBs, the frequency division multiplexing coefficient is 8, and every 2 SSBs are mapped to 1 RO, that is, N=2. All ROs are located within the original BWP of the non-redcap terminal. In the system information of the initial BWP of the redcap terminal, the initial frequency domain position of RO is 10PRB, the frequency division multiplexing coefficient is 4, and every 2 SSB groups are mapped to 1 RO, that is, N=2. In this way, the four ROs with lower frequencies are shared ROs of redcap terminals and non-redcap terminals.

For the redcap terminal, the SSB is also divided into 8 SSB groups, each group contains M=2 SSB, group 1 is {SSB0, SSB8}, group 2 is {SSB1, SSB9}, ..., group 8 is {SSB7,SSB15}. In the shared RO, in order to distinguish redcap terminals from non-redcap terminals, redcap terminals and non-redcap terminals need to use different preambles for access. The number of the preamble used by the redcap terminal is arranged after the number of the preamble of the non-redcap terminal. In order to let the redcap terminal know the location of the preamble that it can use, the system message broadcasts the following parameters: M=2, N=2, R=12, Q=16 and

In the shared RO, the redcap terminal can calculate the starting position of the preamble it can use (that is, the number of the starting preamble) according to the parameters carried in the system message and the above formula (1). For example, if the redcap terminal selects SSB0, the starting position of the preamble that can be used is:

Starting from the preamble numbered 12, consecutive Q/M=16/2=8 preambles can be used to select the redcap terminal of SSB0 for random access. If the redcap terminal selects SSB8, the starting position of the preamble that can be used is:

Starting from the preamble numbered 20, consecutive Q/M=16/2=8 preambles can be used to select the redcap terminal of SSB8 for random access. If the redcap terminal selects SSB1, the starting position of the preamble it can use is:

Starting from the preamble numbered 44, consecutive Q/M=16/2=8 preambles can be used to select the redcap terminal of SSB1 for random access. If the redcap terminal selects SSB9, the starting position of the preamble that can be used is:

Starting from the preamble numbered 52, consecutive Q/M=16/2=8 preambles can be used to select the redcap terminal of SSB9 for random access.

Case 2: The RO configuration information corresponding to the RO set includes first information, and the first information may be used to indicate the preamble allocated to the first type of terminal among the preambles corresponding to the RO set. The design of the specific first information is as follows:

In a possible design, the first information includes a bitmap (bitmap), and the bitmap may include a plurality of bits corresponding to the preamble assigned to the first type of terminal in the preamble corresponding to the RO set. When the value of the bit is the first When the value is one, the preamble corresponding to this bit is allocated to the first type of terminal, and can be used for random access of the first type of terminal. When the value of the bit is the second value, the preamble corresponding to this bit is not allocated to the first type of terminal. It is used by a type-1 terminal and cannot be used by a type-1 terminal for random access. One bit can correspond to one or more preambles.

Optionally, the first value may be a binary bit 1, and the second value may be a binary bit 0; or the first value may be a binary bit 0, and the first value may be a binary bit 1, without limitation.

In another possible design, the first information may include the number of preambles allocated to the first type of terminal in the preamble corresponding to the RO set, the number of the starting preamble (or the smallest numbered preamble) allocated to the first type of terminal, And one or more information in the number of preambles that cannot be used in the preambles assigned to the first type of terminal. That is, the first information may carry the number of preambles allocated to the first type of terminal, the number of the starting preamble (or the smallest numbered preamble) allocated to the first type of terminal, and the number of unusable preambles allocated to the first type of terminal. All or some of the parameters of the preamble number. In the case of carrying some parameters, other parameters can be default values or pre-configured.

In another possible design, the first information may include one or more of the following information: the first information includes the number of the start preamble and the number of the end preamble assigned to the first type of terminal in the preamble corresponding to the RO set , and one or more information in the preamble number assigned to the first type of terminal that cannot be used in the preamble. That is, the first information can carry parameters such as the number of the start preamble assigned to the first type of terminal in the preamble corresponding to the RO set, the number of the end preamble, and the number of the unusable preamble among the preambles assigned to the first type of terminal All or part of the parameters. In the case of carrying some parameters, other parameters can be default values or pre-configured. It should be understood that in this application, the number of the start preamble allocated to the first type of terminal and the number of the end preamble may be replaced with the interval of the preamble allocated to the first type of terminal. The numbers of the unusable preambles among the preambles assigned to the first type of terminals include the unusable start preamble numbers and the end preamble numbers, that is, the intervals of the unusable preambles among the preambles allocated to the first type of terminals, etc. limit.

Wherein, the unusable preamble in the preamble allocated to the first type of terminal may refer to the preamble allocated to the first type of terminal that cannot be used by the first type of terminal for random access or the preamble allocated to the first type of terminal Skip (skipped) preamble. In the second case, the number of the unusable preamble among the preambles allocated to the first type of terminal may be replaced by the number of the preamble used for the random access of the first type of terminal among the preambles allocated to the first type of terminal. It should be understood that if all the preambles in the preambles allocated to the first type of terminals can be used by the first type of terminals to perform random access, the first information may not carry unusable preambles among the preambles allocated to the first type of terminals On the contrary, the first information may carry the number of the unusable preamble assigned to the first type of terminal in the preamble.

Exemplarily, in the RO shared by the first type of terminal and the second type of terminal, the preamble allocated to the first type of terminal and the preamble allocated to the second type of terminal may partially overlap, if random access through the preamble is not required The overlapping preamble can be shared by the first type of terminal and the second type of terminal. If it is necessary to distinguish the random access mode through the preamble, such as distinguishing whether it is 2-step RA, the overlapping preamble cannot be shared by the first type of terminal. It is shared by the terminal of the first type and the terminal of the second type, but is exclusively shared by the terminal of the first type or the terminal of the second type. The unusable preamble among the preambles allocated to the first type of terminal may include the first preamble that can be used by other types of terminals but cannot be used by the first type of terminal and cannot be shared among the preambles allocated to the first type of terminal. The first preamble is included in preambles that overlap with preambles allocated to terminals of the first type and preambles allocated to terminals of other types (such as terminals of the second type).

For example, for the first type of terminal, the first preamble is used for the first type of terminal to perform 4-step RA; for the second type of terminal, the first preamble can be used for the second type of terminal to perform 2-step RA. The RA method of the terminal is different, and the follow-up processing method is completely different. In order to distinguish whether the overlapping preamble is 4-step RA or 2-step RA, the first preamble is only used for the second type of terminal to perform 2-step RA. It is not used for 4-step RA on the first type of terminal.

For example, as shown in Figure 10c, in the RO shared by redcap terminals and non-redcap terminals, a total of 64 preambles can be used for random access, and the preamble allocated to redcap terminals overlaps with the preamble allocated to non-redcap terminals. The preamble for 4-step RA for redcap terminals is the preamble numbered [0,1,2,…,31], and the preamble for 2-step RA assigned to non-redcap terminals is numbered [32,33] ,...,39] the preamble. Here, the preamble assigned to redcap terminals partially overlaps with the preamble used by non-redcap terminals for 4-step RA. The overlapping preamble may not be distinguished in Msg1, but due to the two accesses of 4-step RA and 2-step RA The follow-up processing method of the method is completely different. The 4-step RA of the redcap terminal must be distinguished from the 2-step RA. Therefore, the preamble assigned to the redcap terminal has two intervals: interval 1 is preamble15-preamble 31, and this part of the preamble is related to the non- The 4-step random access sharing of the redcap terminal, and the interval 2 is preamble40-preamble 55, this part of the preamble is dedicated to the redcap terminal.

For the situation in Fig. 10c, in a possible design, bitmap[0000111100111100] can be used to represent the preamble assigned to the redcap terminal. Each bit represents 4 consecutive preambles. In another possible design, it can be divided into two intervals for indication: interval 1 {starting preamble number: 16, number of preambles: 16}, interval 2: {starting preamble number: 40, preamble number Quantity: 16}; or interval 1 {start preamble number: 16, end preamble number: 31}, interval 2 {start preamble number: 40, end preamble number: 55}. In another possible design, the redcap terminal may be notified that the initial preamble number is 16, the number of preambles is 40, and the unusable preambles include preambles numbered 32-39. Among them, the unusable preamble can also be understood as a skipped preamble.

For another example, as shown in Figure 10d, in a shared RO, preambles numbered [0-31] are allocated to non-redcap terminals, while preambles allocated to redcap terminals are 16 preambles numbered from 32 to 47 . Referring to the above case 2, the 16 preambles numbered 32 to 47 can be indicated to redcap in the following way: In a possible design, assume that binary bit 1 indicates that the preamble is allocated to the first type of terminal, and binary bit 0 Indicates that the preamble is not assigned to the first type of terminal, and one bit corresponds to a preamble, and the RO configuration information includes a sequence: [000000000000000000000000000000001111111111111110000000000000000], the length of this sequence is 64, each bit corresponds to a preamble, and the bit marked as 1 represents The corresponding preamble can be assigned to the redcap terminal for use. In order to save signaling overhead, one bit can also be used to correspond to multiple preambles. Assuming that one bit corresponds to four consecutive preambles, the RO configuration information can carry [0000000011110000] to indicate the preamble assigned to the redcap terminal. The sequence of The length is 16, the first bit corresponds to preamble0-3, the second bit corresponds to preamble 4-7, and so on. In this way, because the preamble numbers assigned to the redcap terminal are 32 to 47, bits 9-12 in the bitmap are set to 1. In another possible design, the RO configuration information may include the starting preamble number: 32, and the number of consecutively used preambles: 16, so that the terminal can calculate that preamble 32 to preamble 47 can be used. In yet another possible design, the RO configuration information may include the number of the start preamble: 32 and the number 47 of the end preamble.

In the embodiment of the present application, the RO can be shared by multiple types of terminals, for example, shared by the first type of terminal and the second type of terminal, and some or all of the ROs shared by multiple types of terminals can also be shared by 4-step RA and 2 -step RA sharing. Or the RO is only shared by one type of terminal, for example, only by the redcap terminal, and the exclusive RO is shared by 4-step RA and 2-step RA. When 4-step RA and 2-step RA are shared, in order to distinguish/identify whether the initiated random access is 4-step RA or 2-step RA, you can configure different settings for 4-step RA and 2-step RA preamble.

In the case that the RO shared by the 4-step RA and the 2-step RA is exclusively shared by a type of terminal, the preamble corresponding to the shared RO can be divided into different preambles corresponding to the 4-step RA and the 2-step RA. For example, as shown in Figure 11a, 60 preambles for RA are configured. In the RO shared by 4-step RA and 2-step RA, the preamble numbered [0,1,...,31] is used for competitive random access of 4-step random access; the number is [32,33,... ,39] is used for competitive random access of two-step random access; the preamble numbered [40,41,...,59] is used for non-competitive random access. Through preamble division, in the RO shared by 4-step RA and 2-step RA, if a terminal adopts 4-step random access, a preamble is randomly selected from preamble 0-31 to send. If a terminal adopts 2-step random access, a preamble is randomly selected from preamble 32-39 and sent. After receiving the preamble, the access network device can determine which random access method the terminal wants to adopt according to the number of the received preamble.

When the RO shared by 4-step RA and 2-step RA is shared by multiple types of terminals, such as shared by the first type of terminal and the second type of terminal, the preamble corresponding to the shared RO can be divided into 4-step RA Different preamble corresponding to 2-step RA. For example, as shown in Figure 11b, the access network device configures the initial BWP of the non-redcap terminal and the initial BWP of the redcap terminal, and the two share the RO configuration. The mapping relationship between SSB and RO is N=1/4, that is, one SSB is mapped to four ROs. For non-redcap terminals, in each SSB-to-RO mapping cycle, the RO numbered 1 has both 4-step RA and the preamble used by 2-step RA, while the ROs numbered 0, 2, and 3, Only the preamble used by 4-step RA. The number of preambles allocated by 4-step RA of non-redcap terminals is 32; the number of preambles allocated by 2-step RA of non-redcap terminals is 8. While the access network equipment is configured in the RO set {1}, the available preamble range of the redcap terminal is [40-47], and in the RO set {0,2,3}, the available preamble range of the redcap terminal is [32-47]. Furthermore, the mask indication is carried in the system message to indicate which ROs are set 1 and which ROs are set 2. For example, as shown in Table 1, the mask is 2, indicating that RO1 is set 1, and the remaining RO0, RO2, and RO3 are set 2. At the same time, the access network device can refer to the above method to indicate the allocation of the preamble corresponding to each RO set to the terminal. For example, the above bitmap method, or the number of the initial preamble and the number of preambles can be used to indicate the preamble corresponding to the RO set. The preamble assigned to the redcap terminal, the preamble assigned to the non-redcap terminal, etc.

The foregoing mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between various nodes. It can be understood that, in order to realize the above-mentioned functions, each node, such as a terminal and an access network device, includes a corresponding hardware structure and/or software module for performing each function. Those skilled in the art should easily realize that, in combination with the algorithm steps of the examples described in the embodiments disclosed herein, 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 by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

The embodiment of the present application can divide the functional modules of the terminal and the access network device according to the above method example, 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-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. It should be noted that the division of modules in the embodiment of the present application is schematic, and is only a logical function division, and there may be other division methods in actual implementation.

FIG. 12 shows a structural diagram of a communication device 120. The communication device 120 may be a first terminal, or a chip in the first terminal, or a system-on-chip. The communication device 120 may be used to execute the The function of the first terminal. As an implementable manner, the communication device 120 shown in FIG. 12 includes: a receiving unit 1201 , a processing unit 1202 , and a sending unit 1203 .

The receiving unit 1201 is configured to receive at least one SSB from an access network device. For example, the receiving unit 1201 may support the communication device 120 to execute step 701 .

The processing unit 1202 is configured to select a first SSB from at least one SSB, and select a first RO corresponding to the first SSB from RO resources of the first type of terminal. For example, the processing unit 1202 may support the communication device 120 to perform step 702 .

The sending unit 1203 is configured to send the first message carrying the preamble to the access network device on the first RO. For example, the sending unit 1203 may support the communication device 120 to execute step 703 .

Specifically, the relevant descriptions of the first type of RO resources, different RO sets included in the first type of RO resources, and different RO configuration information corresponding to different RO sets can refer to the method embodiment shown in FIG. 7 above. All relevant content of each step involved in the illustrated embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here. The communication device 120 is configured to perform the function of the first terminal in the random access method shown in the method shown in FIG. 7 , so the same effect as the above random access method can be achieved.

As yet another implementable manner, the communication device 120 shown in FIG. 12 includes: a processing module and a communication module. The processing module is used to control and manage the actions of the communication device 120, for example, the processing module may support the communication device 120 to execute step 702 and other control functions. The communication module can integrate the functions of the sending unit 1203 and the receiving unit 1201, and can be used to support the communication device 120 to perform steps 701, 703 and communicate with other network entities, for example, with the functional modules or network entities shown in FIG. 5 communication. The communication device 120 may also include a storage module for storing program codes and data of the communication device 120 .

Wherein, the processing module may be a processor or a controller. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and so on. The communication module may be a transceiver circuit or a communication interface. 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 120 involved in this embodiment of the present application may be the communication device 600 shown in FIG. 6 .

FIG. 13 shows a structural diagram of a communication device 130. The communication device 130 may be an access network device, or a chip in an access network device, or a system-on-chip. The communication device 130 may be used to implement the above-mentioned embodiment. The functions of the access network equipment involved. As an implementable manner, the communication device 130 shown in FIG. 13 includes: a sending unit 1301 and a receiving unit 1302 .

A sending unit 1301, configured to send at least one SSB. For example, the sending unit 1301 may support the communication device 130 to execute step 701 .

The receiving unit 1302 is configured to receive the first message carrying the preamble from the first terminal on the first RO. For example, the receiving unit 1302 may support the communication device 130 to execute step 703 .

Specifically, the relevant descriptions of the first type of RO resources, different RO sets included in the first type of RO resources, and different RO configuration information corresponding to different RO sets can refer to the method embodiment shown in FIG. 7 . All relevant content of the steps can be referred to the functional description of the corresponding functional modules, and will not be repeated here. The communication device 130 is configured to perform the function of the access network device in the random access method shown in the method shown in FIG. 7 , so the same effect as the above random access method can be achieved.

As yet another implementable manner, the communication device 130 shown in FIG. 13 includes: a processing module and a communication module. The processing module is used to control and manage the actions of the communication device 130, for example, the processing module may support the communication device 130 to perform a management function. The communication module can integrate the functions of the receiving unit 1302 and the sending unit 1301, and can be used to support the communication device 130 to perform steps 701 and 703 and communicate with other network entities, for example, with the functional modules or network entities shown in FIG. 5 communication. The communication device 130 may also include a storage module for storing program codes and data of the communication device 130 .

Wherein, the processing module may be a processor or a controller. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and so on. The communication module may be a transceiver circuit or a communication interface. 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 130 involved in this embodiment of the present application may be the communication device 600 shown in FIG. 6 .

FIG. 14 is a structural diagram of a communication system provided by an embodiment of the present application. As shown in FIG. 14 , the communication system may include: a terminal 140 and an access network device 141 . The function of the terminal 140 is the same as that of the above-mentioned communication device 120 . The function of the access network device 141 is the same as that of the above-mentioned communication device 130 , which will not be repeated here.

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

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. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

It should be understood that in this application "at least one (item)" means one or more, "multiple" means two or more, "at least two (items)" means two or three and More than three, "and/or" is used to describe the association relationship of associated objects, which means that there can be three kinds of relationships, for example, "A and/or B" can mean: only A exists, only B exists, and both A and B exist Three cases, where A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) 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.

It should be understood that in this embodiment of the present application, "B corresponding to A" means that B is associated with A. For example, B can be determined from A. It should also be understood that determining B according to A does not mean determining B only according to A, and B may also be determined according to A and/or other information. In addition, the "connection" in the embodiment of the present application refers to various connection methods such as direct connection or indirect connection to realize communication between devices, which is not limited in the embodiment of the present application.

"Transmit" (transmit/transmission) in the embodiments of the present application refers to two-way transmission, including actions of sending and/or receiving, unless otherwise specified. Specifically, "transmission" in the embodiments of the present application includes sending data, receiving data, or sending data and receiving data. In other words, the data transmission here includes uplink and/or downlink data transmission. Data may include channels and/or signals, uplink data transmission means uplink channel and/or uplink signal transmission, and downlink data transmission means downlink channel and/or downlink signal transmission. "Network" and "system" in the embodiments of the present application express the same concept, and the communication system is the communication network.

Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated according to needs It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are only 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 Incorporation or may be integrated into another device, or some features may be omitted, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

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

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

If the integrated unit is realized in the form of a software function 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 embodiment of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the software product is stored in a storage medium Among them, several instructions are included to make a device (which may be a single-chip microcomputer, a chip, etc.) or a processor (processor) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: various media capable of storing program codes such as U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk.

The above is only a specific implementation of the application, but the protection scope of the application is not limited thereto, and any changes or replacements within the technical scope disclosed in the application should be covered within the protection scope of the application . Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

A random access method, characterized in that the method comprises:

The first terminal receives at least one synchronization signal block SSB from the access network device; wherein, the first terminal belongs to the first type of terminal;

The first terminal selects a first random access opportunity RO corresponding to the first SSB and a preamble sequence corresponding to the first RO; wherein the first SSB is included in the at least one SSB, and the first An RO is included in the RO resources of the first type of terminal;

The first terminal sends a first message to the access network device on the first RO, where the first message includes a preamble corresponding to the first RO;

Wherein, the RO resource of the first type of terminal includes multiple RO sets, and different RO sets correspond to different RO configuration information, and the RO configuration information corresponding to the RO set is used to indicate that the preamble corresponding to the RO set is allocated to the RO set. Describe the preamble used by the first type of terminal.
The method according to claim 1, further comprising:

The first terminal receives a system message from the access network device; wherein the system message includes RO configuration information corresponding to each RO set in the plurality of RO sets.
The method according to claim 2, characterized in that,

The system message further includes initial BWP configuration information of the first type of terminal, and the initial BWP configuration information includes RO configuration information corresponding to each RO set.
The method according to any one of claims 1-3, wherein the multiple RO sets include a first RO set and a second RO set, and the time-frequency information of the first RO set and the second RO set The time-frequency information of the RO set is different;

The RO configuration information corresponding to the first RO set is also used to indicate the time-frequency information of the first RO set;

The RO configuration information corresponding to the second RO set is also used to indicate time-frequency information of the second RO set.
The method according to claim 2 or 3, wherein the multiple RO sets include a first RO set and a second RO set, and the time-frequency information of the first RO set and the time-frequency information of the second RO set The time-frequency information is the same;

The system message further includes a mask and the time-frequency information, and the mask indicates the first RO set.
The method according to claim 4 or 5, characterized in that,

The time-frequency information of the RO set includes the time domain position of the RO set, the frequency division multiplexing coefficient, and the starting frequency domain position of the RO set; the starting frequency domain position of the RO set is the starting frequency domain position of the RO set An offset between the initial RO and the initial frequency of the initial BWP, where the offset is an integer greater than or equal to 0, or an integer less than 0.
The method according to claim 6, characterized in that,

The difference between the starting frequency domain position of the RO set and the starting frequency domain position of the initial BWP of the terminal, the system bandwidth, and the offset of the starting RO of the RO set relative to the starting frequency of the system bandwidth There is a relationship between them.
The method according to any one of claims 4-7, characterized in that,

Each RO in the RO set corresponds to N groups of SSBs, and each group of SSBs includes M SSBs; the preambles corresponding to different SSBs are different; wherein, the M and N are integers greater than or equal to 1.
The method according to claim 8, characterized in that,

For the mth SSB in the nth group, the number of the initial preamble assigned to the first type of terminal in the preamble corresponding to the SSB is based on the M, the N, R, Q and
Sure;

Wherein, the R is the total number of preambles used for other types of terminals except the first type of terminals in the preamble corresponding to the SSB group, and the R is an integer greater than or equal to 0; the selection of n is The value range is [0, N-1], said N is an integer greater than or equal to 1; said
is the total number of preambles used for random access in the preamble corresponding to the RO set, the
is an integer greater than 1; the value range of the m is [0, M-1], and the M is an integer greater than or equal to 1; the Q is used in the preamble corresponding to the SSB group for the first The total number of preambles for a type of terminal.
The method according to claim 9, wherein the number of the initial preamble satisfies:
The method according to any one of claims 4-10, wherein the preamble assigned to the first type of terminal in the preamble corresponding to the RO set is indicated by the first information corresponding to the RO set;

Wherein, the first information includes a bitmap bitmap, the bitmap includes a plurality of bits, and one bit corresponds to one or more preambles in the preamble corresponding to the RO set; when the value of the bit is the first value , the preamble corresponding to the bit is allocated to the terminal of the first type, and when the value of the bit is a second value, the preamble corresponding to the bit is not allocated to the terminal of the first type; or,

The first information includes one or more of the following information: the number of preambles allocated to the first type of terminal in the preamble corresponding to the RO set, the number of initial preambles allocated to the first type of terminal number, and the number of the unusable preamble assigned to the preamble of the first type of terminal; or,

The first information includes one or more of the following information: the number of the start preamble and the number of the end preamble allocated to the first type of terminal in the preamble corresponding to the RO set, and the number of the end preamble allocated to the first type of terminal. The number of the preamble that cannot be used in the preamble of the class terminal.
The method according to any one of claims 1-11, characterized in that,

All ROs in the RO resources are located in the initial BWP of the first type of terminal; or,

Part or all of the RO resources are outside the initial BWP of the first type of terminal.
The method according to claim 12, wherein if the first RO is located in the second type of initial BWP, the method further comprises:

The first terminal switches the initial BWP for random access from the initial BWP of the second type of terminal to the initial BWP of the first type of terminal;

The first terminal receives a first response from the access network device on the initial BWP of the first type of terminal; where the first response corresponds to the first message.
The method according to any one of claims 1-13, characterized in that,

The terminal types and/or random access methods corresponding to different RO sets are different.
The method according to claim 14, characterized in that,

The plurality of RO sets are obtained according to the random access mode corresponding to the RO included in the RO resource; and/or,

The multiple RO sets are obtained by dividing the terminal types corresponding to the ROs included in the RO resource.
A random access method, characterized in that the method comprises:

The access network device sends at least one synchronization signal block SSB to the first terminal; wherein the first terminal belongs to the first type of terminal;

The access network device receives a first message from the first terminal on the first RO, where the first message includes a preamble corresponding to a first random access opportunity RO; wherein the first RO Corresponding to the first SSB, the first SSB is included in the at least one SSB, and the first RO is included in the RO resource of the first type of terminal;

Wherein, the RO resource of the first type of terminal includes multiple RO sets, and different RO sets correspond to different RO configuration information, and the RO configuration information corresponding to the RO set is used to indicate that the preamble corresponding to the RO set is allocated to the RO set. Describe the preamble used by the first type of terminal.
The method according to claim 16, further comprising:

The first terminal receives a system message from the access network device; wherein the system message includes RO configuration information corresponding to each RO set in the plurality of RO sets.
The method according to claim 17, characterized in that,

The system message further includes initial BWP configuration information of the first type of terminal, and the initial BWP configuration information includes RO configuration information corresponding to each RO set.
The method according to any one of claims 16-18, characterized in that,

The multiple RO sets include a first RO set and a second RO set, and the time-frequency information of the first RO set is different from the time-frequency information of the second RO set;

The RO configuration information corresponding to the first RO set is also used to indicate the time-frequency information of the first RO set;

The RO configuration information corresponding to the second RO set is also used to indicate time-frequency information of the second RO set.
The method according to claim 17 or 18, wherein the multiple RO sets include a first RO set and a second RO set, and the time-frequency information of the first RO set and the time-frequency information of the second RO set The time-frequency information is the same;

The system message further includes a mask and the time-frequency information; the mask indicates the first RO set.
The method according to claim 19 or 20, characterized in that,

The time-frequency information of the RO set includes the time domain position of the RO set, the frequency division multiplexing coefficient, and the starting frequency domain position of the RO set; the starting frequency domain position of the RO set is the starting frequency domain position of the RO set An offset between the initial RO and the initial frequency of the initial BWP, where the offset is an integer greater than or equal to 0, or an integer less than 0.
The method according to claim 19 or 20, characterized in that,

The difference between the starting frequency domain position of the RO set and the starting frequency domain position of the initial BWP of the terminal, the system bandwidth, and the offset of the starting RO of the RO set relative to the starting frequency of the system bandwidth There is a relationship between them.
The method according to any one of claims 19-22, wherein,

Each RO in the RO set corresponds to N groups of SSBs, and each group of SSBs includes M SSBs; different SSBs correspond to different preambles; wherein, the M and N are integers greater than or equal to 1.
The method of claim 23, wherein,

For the mth SSB in the nth group, the number of the initial preamble assigned to the first type of terminal in the preamble corresponding to the SSB is based on the M, the N, R, Q and
Sure;

Wherein, the R is the total number of preambles used for other types of terminals except the first type of terminals in the preamble corresponding to the SSB group, and the R is an integer greater than or equal to 0; the selection of n is The value range is [0, N-1], said N is an integer greater than or equal to 1; said
is the total number of preambles used for random access in the preamble corresponding to the RO set, the
is an integer greater than 1; the value range of the m is [0, M-1], and the M is an integer greater than or equal to 1; the Q is used in the preamble corresponding to the SSB group for the first The total number of preambles for a type of terminal.
The method according to claim 24, wherein the number of the initial preamble satisfies the formula:
The method according to any one of claims 19-25, wherein the preamble assigned to the first type of terminal in the preamble corresponding to the RO set is indicated by the first information corresponding to the RO set;

Wherein, the first information includes a bitmap bitmap, the bitmap includes a plurality of bits, and one bit corresponds to one or more preambles in the preamble corresponding to the RO set; when the value of the bit is the first value , the preamble corresponding to the bit is allocated to the terminal of the first type, and when the value of the bit is a second value, the preamble corresponding to the bit is not allocated to the terminal of the first type; or,

The first information includes one or more of the following information: the number of preambles allocated to the first type of terminal in the preamble corresponding to the RO set, the number of initial preambles allocated to the first type of terminal number, and the number of the unusable preamble assigned to the preamble of the first type of terminal; or,

The first information includes one or more of the following information: the number of the start preamble and the number of the end preamble allocated to the first type of terminal in the preamble corresponding to the RO set, and the number of the end preamble allocated to the first type of terminal. The number of the preamble that cannot be used in the preamble of the class terminal.
The method according to any one of claims 16-26, characterized in that,

All ROs in the RO resources are located in the initial BWP of the first type of terminal; or,

Part or all of the RO resources are outside the initial BWP of the first type of terminal.
The method according to claim 27, wherein if the first RO is located in the second type of initial BWP, the method further comprises:

The access network device switches the operating frequency corresponding to the first terminal from the initial BWP of the second type of terminal to the initial BWP of the first type of terminal;

The access network device sends a first response to the terminal on the initial BWP of the first type of terminal; where the first response corresponds to the first message.
The method according to any one of claims 16-27, wherein,

The terminal types and/or random access methods corresponding to different RO sets are different.
The method of claim 29, wherein,

The plurality of RO sets are obtained according to the random access mode corresponding to the RO included in the RO resource; and/or,

The multiple RO sets are obtained by dividing the terminal types corresponding to the ROs included in the RO resources.
A communication system, wherein the communication system includes:

An access network device, configured to send at least one synchronization signal block SSB;

A first terminal, configured to receive the at least one SSB; wherein the first terminal belongs to a first type of terminal;

The first terminal is further configured to select a first random access opportunity RO corresponding to the first SSB and a preamble sequence corresponding to the first RO, and send a message to the access network device on the first RO A first message, where the first message includes a preamble corresponding to the first RO;

Wherein, the first SSB is included in the at least one SSB, and the first RO is included in the RO resource of the first type of terminal; the RO resource of the first type of terminal includes multiple RO sets, different The RO set corresponds to different RO configuration information, and the RO configuration information corresponding to the RO set is used to indicate the preamble allocated to the first type of terminal among the preambles corresponding to the RO set.
A communication device, characterized in that the communication device includes a processor and a communication interface, and the processor and the communication interface are used to support the communication device to execute the method according to any one of claims 1-15 Or the method according to any one of claims 16-30.
A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are run on a computer, the computer is made to perform the method as described in any one of claims 1-15 or as described in The method of any one of claims 16-30.
A computer program product, wherein the computer program product includes computer instructions, and when the computer instructions are run on a computer, the computer is made to perform the method according to any one of claims 1-15 or the method according to claim 16- The method of any one of 30.