CN117425224A

CN117425224A - Communication method and device

Info

Publication number: CN117425224A
Application number: CN202210793235.5A
Authority: CN
Inventors: 杨苑青; 周欢; 雷珍珠
Original assignee: Spreadtrum Semiconductor Nanjing Co Ltd
Current assignee: Spreadtrum Semiconductor Nanjing Co Ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2024-01-19
Also published as: WO2024008180A1

Abstract

The application provides a communication method and a device, and relates to the technical field of communication, wherein the method comprises the following steps: and repeatedly transmitting the Msg1 to the network equipment according to the mapping relation between the RO group and the SSB. The number of ROs in the RO group is greater than 1, and the frequency domain resource indexes of ROs in the RO group are the same, and the time domain resource indexes are adjacent. The scheme of the embodiment of the invention can save the time required by repeatedly transmitting the Msg1 and reduce the time for the terminal equipment to access the network equipment.

Description

Communication method and device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

In New Radio (NR), in order to increase coverage of a cell, a network device concentrates energy in one direction at a time, so as to transmit a signal farther, and the next time is transmitted toward another direction, and finally, the coverage of the entire cell is achieved by continuously changing a beam direction. Each beam is associated with a synchronization signal block (Synchronization Signal and PBCH block, SSB), i.e. one beam direction for each SSB.

Currently, when the terminal device performs random access, the network device may not successfully receive the random access request message (Msg 1) sent by the terminal device. In this regard, the random access procedure needs to be enhanced, that is, the Msg1 is repeatedly transmitted (or repeatedly sent) by using a plurality of ROs with different time domain resource indexes, so as to increase the probability of success of random access of the terminal device, where the ROs with different time domain resource indexes are mapped to the same SSB.

In addition, according to the mapping relation between SSBs and physical random access channel occasions (PRACH occalation, RO) in the current protocol, a minimum of 1 physical random access channel (Physical Random Access Channel, PRACH) configuration period is required for mapping a group of SSBs, and the minimum PRACH configuration period is 10ms. When Msg1 is repeatedly transmitted using ROs having different time domain resource indexes, the time required for repeatedly transmitting Msg1 may be excessively long.

Disclosure of Invention

The application provides a communication method and a communication device, so as to solve the technical problems.

In a first aspect, the present application provides a communication method, including:

and repeatedly transmitting a random access request message to the network equipment according to the mapping relation between the RO group and the SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is greater than or equal to 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes under the condition that the number of the RO in the RO group is greater than 1.

In a possible implementation manner, the number of ROs in the RO group is the same as the number of repeated transmissions K of the random access request message, where K is a positive integer.

In a possible implementation manner, the mapping relation between the RO group and the SSB is determined by a first parameter, a second parameter and a third parameter;

Wherein, the value of the first parameter is the number of RO in the RO group; the second parameter is used for determining a mapping relation between the SSB and the number of RO groups, and the number of the RO groups is a positive integer; the third parameter is used to determine the number of ROs over a time unit.

In one possible embodiment, the method further comprises:

a SIB is received from the network device, the SIB including at least one of the first parameter, the second parameter, and the third parameter.

In one possible embodiment, the second parameter is a positive integer.

In a possible implementation manner, the mapping relation between the RO group and the SSB is determined by a first parameter, a third parameter and a fourth parameter;

wherein, the value of the first parameter is the number of RO in the RO group; the third parameter is used for determining the number of RO on a time unit; the fourth parameter is used for determining a mapping relation between the number of SSB and RO.

In one possible embodiment, the method further comprises:

a SIB is received from the network device, the SIB including at least one of the first parameter, the third parameter, and the fourth parameter.

In one possible embodiment, the method further comprises:

Receiving a SIB from the network device, the SIB including the first parameter;

and determining the fourth parameter according to the first parameter.

In one possible embodiment, the value of the first parameter and the value of the fourth parameter are multiplied by 1.

In one possible embodiment, when the first parameter is N1, the third parameter is M1;

when the first parameter is N2, the third parameter is M2;

the N1 and the N2 are different, and the M1 and the M2 are the same or different;

wherein N1, N2, M1 and M2 are positive integers.

In one possible implementation, the mapping procedure of the RO group and the SSB includes:

first, in one RO, the order of the preamble indexes corresponding to the RO is incremented;

secondly, mapping the RO and the SSB in the RO groups according to the granularity of the RO groups, and for one RO group, mapping the SSB which is sequentially associated with the RO groups according to the sequence from small to large of the time domain resource index of the RO in the RO group;

then, mapping the RO groups and the SSB in sequence according to the sequence from small to large of the frequency domain resource indexes of the RO groups aiming at the RO groups with the same time domain resource indexes;

Thirdly, mapping with the SSB in sequence from small to large according to the time domain resource index of the RO group in the PRACH time slot;

and finally, mapping the RO group and the SSB sequentially according to the sequence from small to large of the index of the PRACH time slot.

In one possible implementation manner, the number of repeated transmission times K of the random access request message satisfies:

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

In a second aspect, the present application provides a communication method, including:

receiving a random access request message;

and sending a random access response message according to the mapping relation between the RO group and the SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is greater than or equal to 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes under the condition that the number of the RO in the RO group is greater than 1.

In one possible embodiment, the method further comprises:

and sending SIB to the terminal equipment, wherein the SIB comprises at least one of the first parameter, the second parameter and the third parameter.

In one possible embodiment, the second parameter is a positive integer.

In one possible embodiment, the method further comprises:

and sending SIB to the terminal equipment, wherein the SIB comprises at least one of the first parameter, the third parameter and the fourth parameter.

when the first parameter is N2, the third parameter is M2;

wherein N1, N2, M1 and M2 are positive integers.

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

In a third aspect, the present application provides a communication device comprising:

and the receiving and transmitting module is used for repeatedly transmitting a random access request message to the network equipment according to the mapping relation between the RO group and the SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is greater than or equal to 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes under the condition that the number of the RO in the RO group is greater than 1.

In one possible embodiment, the transceiver module is further configured to:

In one possible embodiment, the second parameter is a positive integer.

In one possible embodiment, the transceiver module is further configured to:

receiving a SIB from the network device, the SIB including the first parameter;

and determining the fourth parameter according to the first parameter.

when the first parameter is N2, the third parameter is M2;

wherein N1, N2, M1 and M2 are positive integers.

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

In a fourth aspect, the present application provides a communication device comprising:

a receiving module, configured to receive a random access request message;

and the sending module is used for sending a random access response message according to the mapping relation between the RO group and the SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is greater than or equal to 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes under the condition that the number of the RO in the RO group is greater than 1.

In a possible implementation manner, the sending module is further configured to:

In one possible embodiment, the second parameter is a positive integer.

when the first parameter is N2, the third parameter is M2;

wherein N1, N2, M1 and M2 are positive integers.

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

In a fifth aspect, the present application provides a terminal device, including: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the method of any one of the first aspects.

In a sixth aspect, the present application provides a network device, comprising: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the method of any of the second aspects.

In a seventh aspect, the present application provides a computer-readable storage medium having stored therein computer-executable instructions which, when executed by a computer, implement the method according to any one of the first or second aspects.

In an eighth aspect, the present application provides a computer program product comprising a computer program which, when run by a computer, causes the communication method of any one of the first or second aspects to be performed.

In a ninth aspect, the present application provides a chip comprising a processor, wherein:

the processor is configured to execute computer-executable instructions stored in a memory, causing the chip to perform the method according to any one of the first aspects.

In a tenth aspect, the present application provides a chip comprising a processor, wherein:

The processor is configured to execute computer-executable instructions stored in a memory to cause the chip to perform the method of any of the second aspects.

In an eleventh aspect, the present application provides a chip module comprising a chip as described in the ninth aspect and a chip as described in the tenth aspect.

In a twelfth aspect, the present application provides a communication system, wherein the communication system comprises a terminal device according to the fifth aspect and a network device according to the sixth aspect.

In the communication method and device provided by the embodiment of the application, when the random access process is enhanced, the Msg1 is repeatedly transmitted by adopting a plurality of ROs with different time domain resource indexes, and the ROs with different time domain resource indexes are mapped to the same SSB. In the method, the RO and the SSB are mapped by taking the RO group as granularity, so that the RO in the same RO group is associated with the same SSB, and the time domain resource indexes of the RO in the same RO group are adjacent, thereby saving the time required by repeatedly transmitting the Msg1 and reducing the time of accessing the terminal equipment into the network equipment.

Drawings

Fig. 1 is a schematic diagram of an application scenario provided in an embodiment of the present application;

fig. 2 is a schematic diagram of an RO provided in an embodiment of the present application;

Fig. 3a is a schematic diagram of mapping relationship between SSB and RO when n=1/2 provided in the embodiment of the present application;

fig. 3b is a schematic diagram of mapping relationship between SSB and RO when n=1 according to an embodiment of the present application;

fig. 3c is a schematic diagram of a mapping relationship between SSB and RO when n=2 according to an embodiment of the present application;

fig. 4 is a schematic diagram of random access provided in an embodiment of the present application;

fig. 5 is a signaling diagram of a communication method provided in an embodiment of the present application;

fig. 6a is a schematic diagram of mapping relationship between an RO group and SSB when l=1 provided in the embodiment of the present application;

fig. 6b is a schematic diagram of mapping relationship between RO groups and SSB when l=1/2 provided in the embodiment of the present application;

fig. 6c is a schematic diagram of mapping relationship between RO groups and SSB when l=2 according to an embodiment of the present application;

fig. 7 is a schematic diagram of a mapping relationship between an RO group and SSB after dividing RO resources according to the number of repeated transmissions according to an embodiment of the present application;

fig. 8 is a schematic diagram two of mapping relationship between an RO group and SSB after dividing RO resources according to the number of repeated transmissions provided in the embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a second communication device according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

Fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In addition, it should be understood that, in the description of the present application, the terms "first," "second," and the like are used for distinguishing between the descriptions, and not be construed as indicating or implying any particular importance, or order of description, nor as indicating or implying any particular relationship or order of such terms.

In this embodiment, "of", "corresponding", "associated", "mapped" may be used in a mixed manner. It should be noted that the concepts or meanings to be expressed are consistent when de-emphasizing the distinction.

A scenario to which the method of the present application is applied will be described below with reference to fig. 1.

Fig. 1 is a schematic diagram of an application scenario provided in an embodiment of the present application. Referring to fig. 1, the network device 11 and the terminal device 12 are included, and wireless communication and data transmission can be performed between the network device 11 and the terminal device 12.

The terminal equipment generally has a wireless transceiving function, and can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a vehicle-mounted terminal device, a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), a wearable terminal device, or the like. The terminal device according to the embodiments of the present application may also be referred to as a terminal, a User Equipment (UE), an access terminal device, a vehicle terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE apparatus, etc. The terminal device may also be fixed or mobile.

The network device typically has wireless transceiving functionality and may have mobile characteristics, e.g., the network device may be a mobile device. Alternatively, the network device may be a satellite, a balloon station. For example, the satellite may be a Low Earth Orbit (LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geosynchronous orbit (geostationary earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite, or the like. Of course, the network device may also be a base station disposed in a land, a water area, or the like, and for example, the network device may be a next generation base station (gNB) or a next generation evolved node b (ng-eNB). The ngNB provides a user plane function and a control plane function of a New Radio (NR) for the UE, and the ng-eNB provides a user plane function and a control plane function of an evolved universal terrestrial radio access (evolved universal terrestrial radio access, E-UTRA) for the UE, which should be noted that the gNB and the ng-eNB are only one name, which is used to indicate a base station supporting the 5G network system, and are not limited. The network device may also be a base station (base transceiver station, BTS) in a global system for mobile communications (global system for mobile communication, GSM) or code division multiple access (code division multiple access, CDMA) system, a base station (nodeB, NB) in a wideband code division multiple access (wideband code division multiple access, WCDMA) system, or an evolved base station (evolutional node B, eNB or eNodeB) in a Long Term Evolution (LTE) system. Alternatively, the network device may also be a relay station, an access point, an in-vehicle device, a wearable device, a network-side device in a network after 5G or a network device in a public land mobile network (public land mobile network, PLMN) network for future evolution, a Road Site Unit (RSU), or the like.

It can be understood that the technical solution of the embodiment of the present application may be applied to a fifth generation mobile communication (the 5th Generation Mobile Communication,5G) system and an NR communication technology, where NR refers to a new generation radio access network technology, and may also be applied to a future evolution network. The scheme in the embodiment of the application can also be applied to other wireless communication networks such as wireless fidelity (Wireless Fidelity, WIFI) and LTE, and corresponding names can be replaced by names of corresponding functions in the other wireless communication networks. The technical scheme is also applicable to different network architectures including, but not limited to, a land communication network architecture, a non-land communication network architecture, a relay network architecture, a dual connectivity architecture, a Vehicle-to-evaluation architecture, etc.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.

To make the present application clearer, a basic concept and related technologies to which the present application relates will be explained first.

1. Random access preamble (Random Access preamble, RA preamble)

The random access preamble is a series of sequences transmitted by the terminal device for applying to access the network, including but not limited to gold sequences, m-sequences, ZC (Zadoff-Chu) sequences, etc. The random access preamble may be simply referred to as a preamble (preamble). The composition of the preamble may include a cyclic prefix and a guard interval in addition to the main sequence.

2. Repeat times of Msg1

The number of repetitions of Msg1 may be used to represent the number of multiple (or repeated) transmissions of Msg1. For example, when the number of repetitions of Msg1 is 4, this indicates that Msg1 is repeatedly transmitted 4 times.

3、RO

In the random access process, time-frequency resources are needed for the transmission of the PRACH message, and the time-frequency resources of the PRACH are divided to obtain at least one RO. Wherein RO is used to transport or carry Msg1. The RO may include time domain resources and frequency domain resources. Specifically, the time domain resources may be indicated by a time domain resource index (time resource index), and the frequency domain resources may be indicated by a frequency domain resource index (frequency resource index). For the time domain resource corresponding to one time domain resource index, the number of ROs in the frequency domain may be {1,2,4,8}, configured by the higher layer parameter "msg 1-FDM". The time domain location or time domain resource of the RO is configured in time domain by the parameter "prach-configuration index". For convenience of description, the description of "one time domain resource", "different time domain resources", "one time unit" is used hereinafter, and both the time domain resource and the time unit in the description refer to a time domain resource corresponding to a time domain resource index, where the time domain resource index is used to indicate the time domain resource of RO.

For example, fig. 2 is an RO schematic diagram provided in the embodiment of the present application, the horizontal axis is a time domain resource, the vertical axis is a frequency domain resource, ROjk in the present application refers to an RO with a time domain resource index j (j is an integer greater than or equal to 0), and a frequency domain resource index k (k is an integer greater than or equal to 0), for example, RO01 in fig. 2 refers to an RO with a time domain resource index 0 and a frequency domain resource index 1, and RO10 in fig. 2 refers to an RO with a time domain resource index 1 and a frequency domain resource index 0.

It should be noted that, the time domain resources of two ROs adjacent to each other may be contiguous in the time domain or may be discontinuous in the time domain. For example, referring to fig. 2, in fig. 2, RO00 is RO with a time domain resource index of 0, and the time domain resource is an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol with an index of 0 to 1 at the 4 th subframe in the system frame. RO10 is the RO with the index of time domain resource being 1, and the time domain resource is the OFDM symbol with the index of 2-3 in the 4 th subframe in the system frame. At this time, the time domain resources of RO00 and RO10 are contiguous. For another example, RO20 is an RO with a time domain resource index of 2, its time domain resource is an OFDM symbol with an index of 0 to 1 in the 3 rd subframe in the system frame, RO30 is an RO with a time domain resource index of 3, and its time domain resource is an OFDM symbol with an index of 0 to 1 in the 4 th subframe in the system frame, and at this time, the time domain resources of RO20 and RO30 are discontinuous.

The frequency domain resource index may be continuous in the frequency domain or discontinuous in the frequency domain for two ROs adjacent to each other. For example, referring to fig. 2, in fig. 2, RO00 is RO with a frequency domain resource index of 0, and RO01 is RO with a frequency domain resource index of 1. RO00 and RO01 are two ROs adjacent to each other that are indexed by frequency domain resource, and the frequency domain resources of the two ROs are contiguous in the frequency domain.

4. Mapping between SSB and RO

In one possible implementation, the SSB and the RO may be mapped sequentially in the following order (denoted as mapping rule 1):

first, in one RO, the order of preamble indexes is incremented;

second, the frequency domain resource index order of the frequency division multiplexing (frequency multiplexed) RO is incremented;

again, the order of the time domain resource indexes of the time multiplexed (time multiplexed) ROs within one PRACH slot is incremented;

finally, the order of PRACH slot indexes is incremented.

The mapping relationship between SSB and RO may be indicated by a higher-level parameter "SSB-perRACH-action (N)", and the value of N may be {1/8,1/4,1/2,1,2,4,8,16}, for example.

If N <1, it represents that 1 SSB can be mapped into 1/N RO. For example, if n=1/4, then one SSB associates 4 ROs; if n=1/8, then one SSB associates 8 ROs;

If n=1, it means that 1 SSB maps into 1 RO;

if N >1, N SSBs can be mapped within 1 RO. For example, let n=2, the number of preambles in each RO be 64 as an example. In this case, 1 RO is associated with two SSBs, and the 1 st SSB and the 2 nd SSB of the two SSBs are SSB0 and SSB1, respectively, wherein SSBi represents SSB with index i, i is an integer greater than or equal to 0 and less than Q, Q is the number of SSBs configured in a cell, and Q is a positive integer. The preamble associated with SSB0 has a preamble index of 0 to 31, and the preamble associated with SSB1 has a preamble index of 32 to 63.

3 a-3 c illustrate the mapping of SSB and RO in one possible embodiment.

Fig. 3a is a schematic diagram of a mapping relationship between SSB and RO when n=1/2 provided in an embodiment of the present application, fig. 3b is a schematic diagram of a mapping relationship between SSB and RO when n=1 provided in an embodiment of the present application, fig. 3c is a schematic diagram of a mapping relationship between SSB and RO when n=2 provided in an embodiment of the present application, and as shown in fig. 3a to 3c, in an exemplary configuration, a horizontal axis is a time domain resource and a vertical axis is a frequency domain resource.

In fig. 3a to 3c, taking 8 SSBs configured in a cell, their respective indexes are respectively 0 to 7, and the parameter msg 1-fdm=4 as an example, the mapping relationship between SSBs and ROs is introduced for different values of the parameter SSB-perRACH-allocation. Wherein the parameter msg 1-fdm=4 indicates that on one time domain resource, the number of frequency domain resource indexes of RO is 4 (i.e. the number of ROs is 4), and in fig. 3 a-3 c, the 4 frequency domain resource indexes are 0-3.

In fig. 3a, the mapping relationship between SSB and RO is described by taking parameter SSB-perRACH-action=1/2 (i.e. n=1/2) as an example, and parameter SSB-perRACH-action=1/2 indicates that 1 SSB maps 2 ROs.

Therefore, SSB 0 is mapped to 2 ROs in order of increasing frequency domain resource index, that is, RO in which the time domain resource index of RO is 0 and the frequency domain resource index is 0, 1.

Since the number of SSBs is 8, the SSBs are not mapped yet, so according to the above-mentioned "mapping rule 1", the SSB1 is mapped into 2 ROs in turn according to the ascending order of the frequency domain resource index, that is, the RO has a time domain resource index of 0 and frequency domain resource indexes of 2 and 3.

Similarly, SSB2 is mapped sequentially into 2 ROs having a time domain resource index of 1 and frequency domain resource indexes of 0 and 1 in ascending order of the indexes of the frequency domain resources. SSB3, SSB4, &.

In fig. 3b, the mapping relationship between SSB and RO is described by taking parameter SSB-perRACH-occupancy=1 (i.e. n=1) as an example, and parameter SSB-perRACH-occupancy=1 indicates that 1 SSB maps 1 RO.

Therefore, SSBs 0 to 3 are sequentially mapped to ROs of which the time domain resource index is 0 and the frequency domain resource indexes are 0, 1, 2, and 3 in the order in which the frequency domain resource indexes are increased. Namely SSB 0 is mapped into RO with the time domain resource index of 0 and the frequency domain resource index of 0; SSB1 is mapped into RO with a time domain resource index of 0 and a frequency domain resource index of 1; SSB2 is mapped into RO with a time domain resource index of 0 and a frequency domain resource index of 2; SSB3 maps into RO with a time domain resource index of 0 and a frequency domain resource index of 3.

Since the number of SSBs is 8, SSBs are not mapped yet, SSBs 4 to 7 are mapped to ROs having a time domain resource index of 1 and frequency domain resource indexes of 0, 1, 2, and 3 in order of increasing frequency domain resource indexes according to the above-mentioned "mapping rule 1". Namely SSB 4 is mapped into RO with a time domain resource index of 1 and a frequency domain resource index of 0; SSB5 is mapped into RO with a time domain resource index of 1 and a frequency domain resource index of 1; SSB6 is mapped into RO with a time domain resource index of 1 and a frequency domain resource index of 2; SSB7 maps into RO with a time domain resource index of 1 and a frequency domain resource index of 3. And so on.

In fig. 3c, the SSB-perRACH-action=2 (i.e. n=2) is taken as an example to describe the mapping relationship between SSB and RO, and the parameter SSB-perRACH-action=2 indicates that 2 SSBs map 1 RO.

As shown in fig. 3c, the specific mapping is as follows:

SSB 0/1 maps to RO with time domain resource index 0 and frequency domain resource index 0, SSB 2/3 maps to RO with time domain resource index 0 and frequency domain resource index 1, SSB 4/5 maps to RO with time domain resource index 0 and frequency domain resource index 2, and SSB 6/7 maps to RO with time domain resource index 0 and frequency domain resource index 3. And the rest is the same.

5. Random access procedure

Random access refers to a process that a terminal device sends a preamble to a network device, establishes a wireless link with the network device, and acquires or resumes uplink synchronization. Random access is a key step in a mobile communication system, so that a terminal device and a network device establish a communication connection. The terminal equipment performs information interaction with the network equipment through random access, and uplink synchronization can be realized through random access.

Fig. 4 is a schematic diagram of random access provided in the embodiment of the present application, as shown in fig. 4, the whole process includes 4 steps: transmission of Msg1, transmission of message 2 (Msg 2), transmission of message 3 (Msg 3), and transmission of message 4 (Msg 4).

S41, transmission of the Msg1, namely, the terminal equipment sends the Msg1 to the network equipment.

Specifically, msg1 includes a preamble. The main function of the preamble is to request access to the network device, so that the network device can estimate the transmission delay between the network device and the terminal device based on the preamble, calibrate the uplink timing based on the transmission delay, and indicate the uplink timing to the terminal device through Msg2.

S42, transmission of Msg2, i.e. transmission of random access response (Random Access Response, RAR) by the network device to the terminal device. The network device receives the Msg1 and sends the Msg2 to the terminal device.

Specifically, the network device sends Msg2 to the terminal device on a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) payload (payload). Illustratively, in an embodiment of the present application, the RAR message is scrambled by a random access radio network temporary identity (Random Access Radio Network Temporary Identifier, RA-RNTI). In some embodiments, the value of the RA-RNTI is determined by the time-frequency resource location of the resource carrying the preamble.

For the terminal device, after the terminal device sends the preamble, the terminal device may monitor the physical downlink control channel (Physical Downlink Control Channel, PDCCH) in the RAR time window according to the RA-RNTI to obtain downlink control information (Downlink Control Information, DCI), and then the terminal device uses the RA-RNTI to parse the PDSCH payload according to the DCI to receive the Msg2 scrambled by the RA-RNTI. If Msg2 is not received within the RAR time window, then the random access procedure is considered to fail.

Msg2 may contain an amount of time adjustment required for specifying uplink synchronization, uplink resources required for the terminal device to transmit Msg3, a Temporary Cell radio network Temporary identity (TC-RNTI), and the like.

The first two steps of the random access procedure, msg1 and Msg2, mainly accomplish uplink time synchronization, while the main purpose of Msg3 and Msg4 is to assign a unique and legal identity to the terminal device for subsequent data transmission.

S43, the transmission of the Msg3 is carried out, the terminal equipment receives the Msg2 and sends the Msg3 to the network equipment. For example, the terminal device sends Msg3 to the network device on a physical uplink shared channel (Physical Uplink Share Channel, PUSCH). Further, in some embodiments, the Msg3 contains a terminal device unique tag. This flag may be used for conflict resolution at S44. For example, for a terminal device in a connected state, the terminal device unique identifier is a Cell radio network temporary identity (Cell-Radio Network Temporary Identifier, C-RNTI); for another example, for a terminal device in a non-connected state, the terminal device unique identifier is a unique terminal device identifier from the core network.

S44, transmitting the Msg4, wherein the network equipment receives the Msg3 and sends the Msg4 to the terminal equipment.

The network device carries the flag in Msg4 for uniquely identifying the terminal device in the collision resolution mechanism to indicate the winning terminal device, whereas the terminal device that is not winning in the collision resolution will re-initiate random access. If the PDSCH received by the terminal device in Msg4 is scrambled by the TC-RNTI specified in Msg2, the terminal device may consider random access to be successful when the UE contention resolution identity (Contention Resolution Identity) MAC Control Element (CE) contained in the successfully decoded media access Control (Medium Access Control, MAC) protocol data unit (Protocol Data Unit, PDU) matches the common Control channel (Common Control Channel, CCCH) traffic data unit (Service Data Unit, SDU) transmitted by Msg3. For non-connected terminal equipment, the TC-RNTI is converted into C-RNTI.

6. Beam and SSB

In NR, the cell frequency increases and accordingly its coverage decreases, and in order to increase the coverage of the cell, some broadcast information is transmitted in the form of coverage, but in the form of beam scanning (beam scanning). The network device concentrates energy in one direction at a time, thereby transmitting signals farther away. The next moment is sent towards the other direction, and finally the coverage of the whole cell is realized by continuously changing the beam direction. Each beam is associated with one SSB, i.e. one beam direction for each SSB.

The foregoing is a simplified description of the basic concepts and related arts involved in this application.

Currently, when the terminal device performs random access, the network device may not successfully receive the Msg1 sent by the terminal device. In this regard, the random access procedure needs to be enhanced, that is, the Msg1 is repeatedly transmitted by using ROs with different time domain resource indexes, so as to increase the probability of success of random access of the terminal device. The PRACH association period required for mapping a set of SSBs (e.g., SSBs 0-SSB 7) according to the SSB to RO mapping relationship illustrated in fig. 3 a-3 c is shown in table 1. Wherein, the specific value of the association period is related to the number of RO and the value of N in one PRACH configuration period.

TABLE 1

PRACH configuration period (ms)	Association cycle
		10	{1,2,4,8,16}
20	{1,2,4,8}
		40	{1,2,4}
80	{1,2}
		160	{1}

As can be seen from table 1, the minimum PRACH configuration period is 10ms, and 1 or more PRACH configuration periods are required for mapping a group of SSBs, and when enhancing Msg1, if Msg1 is repeatedly transmitted by using ROs with different time domain resource indexes, and the ROs with different time domain resource indexes are mapped to the same SSB, the time required for transmitting Msg1 may be excessively long. For example, assuming that the number of repeated transmissions is 2, the PRACH configuration period is 10ms, the association period is 1, and if the repeated transmission uses the RO resource associated with SSB0, one PRACH configuration period is needed between the two repeated transmissions, that is, 10ms (for example, see fig. 3a, where RO where the two repeated transmissions are located is RO00 and RO40, see fig. 3b, where RO where the two repeated transmissions are located is RO00 and RO20, respectively), this may result in too long time needed for the repeated transmission Msg1, and further affect the access efficiency of the terminal device. It will be appreciated that this problem is exacerbated if the PRACH configuration period is longer. Based on this, the embodiment of the application provides a scheme, when the Msg1 is repeatedly transmitted by adopting a plurality of ROs with different time domain resource indexes, the mapping relationship between the SSB and the ROs is redefined, so as to reduce the time for the terminal device to access the network device.

In the embodiment of the present application, the group of SSBs refers to mapping sequentially in units of a plurality of SSBs when mapping RO and SSBs, for example, if a group of SSBs are SSBs 0 to SSB7, it means that mapping is started again from SSB0 after once SSB0 to SSB7 is mapped. In the above description, the SSBs are SSBs 0 to SSB7, and the number of SSBs may be greater or less or may be other SSBs, for example, SSBs 12 to SSB15 of 64 SSBs, which are not limited in this application. In the following examples, a group of SSBs are described as SSB0 to SSB 7.

It should be noted that, the execution bodies of the embodiments in the present application may be chips, chip modules, processors, microprocessors, or the like, or may be devices, such as network devices or terminal devices, that integrate the devices of the chips, the chip modules, the processors, or the microprocessors, where the specific execution bodies of the embodiments in the present application are not limited, and may be selected and set according to actual needs. In the following embodiments, the description will be given taking the execution subject as an example of a network device/terminal device integrating the above-mentioned chip, chip module, processor, microprocessor, or other devices, and the execution subject is not limited to the actual execution subject.

The following will describe aspects of the present application with reference to the accompanying drawings.

Fig. 5 is a signaling diagram of a communication method according to an embodiment of the present application, as shown in fig. 5, the method may include:

s51, the terminal equipment determines the mapping relation between the RO group and the SSB, the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is greater than or equal to 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes under the condition that the number of the RO in the RO group is greater than 1.

S51 is an optional step, namely, before the terminal device sends Msg1 to the network device according to the mapping relationship between the RO group and the SSB, the mapping relationship between the RO group and the SSB may be determined.

One RO group is a collection of two or more ROs, i.e., the number of ROs in the RO group is greater than or equal to 1, and may be, for example, 2, 3, 4, etc. Illustratively, the number of ROs in the RO group is the same as the number of repeated transmissions K of Msg1, where K is a positive integer, e.g., 1,2, 3, 4, etc. Optionally, K meets K e {1,2, 4., 2 ⁿ N is an integer greater than or equal to 0, i.e., K may be 1,2,4, 8, 16, etc. In the case where the number of ROs in the RO group is the same as the number of retransmission times K of Msg1, the terminal device may determine the number of ROs included in one RO according to the number of retransmission times K of Msg1, and in other cases, the number of ROs included in one RO may be preconfigured, or specified by a protocol, or configured by a network device for the terminal device, which is not limited in this application. For convenience of description, the method provided in the present application is exemplified by the same number of ROs in the RO group as the number of repeated transmissions K of Msg 1.

It should be noted that, when the number of repeated transmissions of Msg1 is K, it indicates that the maximum number of repeated transmissions of Msg1 by the terminal device is K, and the number of actual repeated transmissions of Msg1 by the terminal device may be equal to or less than K. For example, the terminal device repeatedly transmits Msg1 to the network device for K times, then determines whether Msg2 transmitted by the network device is received, if yes, the terminal device continues to transmit Msg3, otherwise, the terminal device indicates that random access fails, and the terminal device can opportunistically initiate a random access request again. For example, the terminal device may also repeatedly transmit Msg1 to the network device, and when Msg2 transmitted by the network device has been received when the transmission has not been repeated for K times, the transmission of Msg1 may not be continued at this time.

Of course, the number of ROs in the RO group may be greater or less than the number of repeated transmissions K, and in general, the number of ROs in the RO group is greater than 1. But if the scheme of the present application is considered as a generic scheme, the number of ROs in the RO group may be equal to 1. At this time, only through the scheme of the application, mapping of the RO and the SSB with a single RO (i.e., the number of ROs in the RO group is 1) as granularity can be realized, and mapping of the RO and the SSB with a plurality of ROs (i.e., the number of ROs in the RO group is greater than 1) as granularity can be realized, so as to satisfy various different application scenarios. Since the frequency domain resource indexes of ROs in the RO group are the same, the number of ROs in the RO group is also the number of ROs of different time domain resources in one RO group. For example, in fig. 6a, the number of ROs in the RO group is 2, and thus, each RO group includes 2 ROs having different time domain resource indexes, i.e., the number of ROs of different time domain resources in each RO group is 2.

The frequency domain resource indices of a plurality of ROs in the RO group are the same, and the time domain resource indices are adjacent. For example, based on the example shown in fig. 2, assuming that k=2, the terminal device may determine that the number of ROs in one RO group is 2 according to the value of K, 2 ROs having the same frequency domain resource index and adjacent time domain resource indexes may be mapped as an RO group with the SSB. For example, the frequency domain resource indexes of RO00 and RO10 are the same, and are both index 0, the time domain resource index of RO00 is 0, and the time domain resource index of RO10 is 1, i.e. the time domain resource indexes of RO00 and RO10 are adjacent, so that RO00 and RO10 can be mapped as one RO group with SSB. Similarly, RO01 and RO11 are one RO group, RO02 and RO12 are one RO group, and so on.

It should be noted that, mapping the RO group with the SSB refers to mapping a plurality of ROs with the same frequency domain resource index and consecutive time domain resource indexes as a whole with the SSB, and the present application refers to the plurality of ROs as one RO group for convenience of description, and in an actual implementation process, the concept of the RO group may not exist.

The mapping relationship between an RO group and SSBs refers to mapping one SSB into several RO groups or mapping several SSBs into one RO group. The mapping relation between the SSB and the RO group can be indicated by a parameter L, and the value of L can be {1/8,1/4,1/2,1,2,4,8,16}, for example. The parameter L may be indicated by a higher layer parameter ssb-perRACH-occupancy (L), for example, or by other higher layer parameters, without limitation.

If L <1, it represents that 1 SSB can be mapped into 1/L RO groups. For example, if l=1/2, one SSB (assumed to be SSB 1) associates 2 RO groups, specifically, SSB1 is associated with each RO of the 2 RO groups, for example, if 2 ROs are included in each RO group, 4 ROs are included in the 2 RO groups, and SSB1 is associated with each of the 4 ROs.

If l=1, it represents that 1 SSB is mapped into 1 RO group. At this time, the SSB is mapped to each RO in the RO group, for example, if 2 ROs are included in the RO group, the SSB is mapped to 2 ROs.

If L >1, L SSBs can be mapped on behalf of 1 RO group. At this time, each RO in the RO group maps the L SSBs. For example, if 2 ROs (assuming RO11 and RO 21) are included in the RO group, RO11 maps the L SSBs and RO21 also maps the L SSBs.

Further, the mapping relationship between RO groups and SSBs can be understood in conjunction with fig. 6 a-6 c. Fig. 6a is a schematic diagram of a mapping relationship between an RO group and an SSB when l=1 according to an embodiment of the present application,

fig. 6b is a schematic diagram two of the mapping relationship between the RO group and the SSB when l=1/2 provided in the embodiment of the present application,

fig. 6c is a third schematic diagram of mapping relationship between an RO group and an SSB when l=2 provided in the embodiment of the present application, as shown in fig. 6a to 6c, in which 8 SSBs are configured in a cell, their respective indexes are 0 to 7, and the parameter msg1—fdm=4 is taken as an example, and the mapping relationship between the SSB and the RO group is introduced for different values of the parameter L. Where the parameter msg 1-fdm=4 indicates that the frequency domain resource index of RO includes 4 on 1 time domain resource, and the 4 frequency domain resource indexes shown in fig. 6 a-6 c include index 0, index 1, index 2, and index 3. In fig. 6a to 6c, the grouping of ROs is performed by taking the number of retransmissions of Msg1 as 2 as an example, and in fig. 6a to 6c, one RO group includes 2 ROs having the same frequency domain resource index and adjacent time domain resource indexes. In practice, the number of retransmission times of Msg1 may be other values.

As can be seen from the above, when the value of L is different, the mapping relationship between the RO group and the SSB is also different, and the following description will be given by way of example.

Case 1, l=1

If the network device configures the terminal device with the parameter l=1 through the higher layer parameter, it means that 1 SSB is mapped into 1 RO group. Assuming that the number of repeated transmissions of Msg1 is 2, the 16 ROs shown in fig. 6a may be divided into 8 RO groups, i.e., RO groups 1 to 8, each of which is illustrated with a dotted frame in fig. 6a. The time domain resource index and the frequency domain resource index of ROs in each RO group, and the mapping between RO groups and SSBs can be seen in table 2 and fig. 6a. Wherein one RO group is mapped with one SSB, each RO in the RO group is mapped with the SSB, e.g., each RO in RO group 1 is mapped to SSB0.

TABLE 2

Case 2, L is less than 1

If the network device configures the terminal device with the parameters l=1/2 through the higher layer parameters, it means that 1 SSB is mapped into 2 RO groups. Assuming that the number of repeated transmissions of Msg1 is 2, the 32 ROs shown in fig. 6b may be divided into 16 RO groups, each RO group being illustrated in fig. 6b with a dashed box. The time domain resource index and the frequency domain resource index of ROs in each RO group, and the mapping between RO groups and SSBs can be seen in table 3 and fig. 6b. Wherein a plurality of RO groups are mapped with one SSB, each RO of the plurality of RO groups is mapped with the SSB, e.g., each RO of RO group 1 and RO group 2 is mapped to SSB0.

TABLE 3 Table 3

Case 3, L is greater than 1

If the network device configures the terminal device with the parameter l=2 through the higher layer parameter, it means that 2 SSBs are mapped on each RO in the 1 RO group. Assuming that the number of repeated transmissions of Msg1 is 2, 16 ROs shown in fig. 6c may be divided into 8 RO groups, i.e., RO groups 1 to 8, each RO group being illustrated with a dashed box in fig. 6c. The time domain resource index and the frequency domain resource index of ROs in each RO group, and the mapping between RO groups and SSBs can be seen in table 4 and fig. 6c. Wherein one RO group maps with a plurality of SSBs, each RO in the RO group maps with the plurality of SSBs, e.g., each RO in RO group 1 maps to SSB0 and SSB1.

TABLE 4 Table 4

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S52, the network device determines a mapping relationship between the RO group and the SSB.

The process of determining the mapping relationship between the RO group and the SSB by the network device is similar to that of the terminal device, and will be understood by reference, and will not be described again.

S52 is also an optional step, and S52 may also be performed before S51, which is not limited in this application.

And S53, the terminal equipment repeatedly transmits the Msg1 to the network equipment according to the mapping relation between the RO group and the SSB. Accordingly, the network device receives Msg1.

After determining the mapping relationship between the RO group and the SSB, the terminal device may repeatedly transmit Msg1 to the network device according to the mapping relationship between the RO group and the SSB. The process of transmitting Msg1 is the process of transmitting the preamble from the terminal device to the network device.

Specifically, the terminal device may measure the reference signal received power (Reference Signal Receiving Power, RSRP) corresponding to SSB, for example, may measure RSRP corresponding to SSB0 to SSB7, and if the RSRP corresponding to one SSB (assumed to be SSB 1) is greater than or equal to a preset threshold and the value is the largest, the terminal device sends Msg1 on the RO associated with SSB 1. The terminal equipment determines a plurality of ROs associated with the SSB1 according to the mapping relation between the RO group and the SSB, wherein the time domain resource indexes of the ROs are different, and the same preamble is repeatedly transmitted to the network equipment on the ROs. The preamble may be any one of preambles generated by the terminal device according to the configuration of the network device. Hereinafter, for convenience of description, the SSB having the corresponding RSRP greater than or equal to the preset threshold value and the maximum value is referred to as an optimal SSB.

In case of k=2, exemplarily, based on the example shown in table 2, the plurality of ROs associated with SSB1 may be 2 ROs in RO group 2, and the terminal device may transmit the selected preamble on the 2 ROs in RO group 2, respectively. Based on the example shown in table 3, the plurality of ROs associated with SSB1 may be 2 ROs in RO group 3, may be 2 ROs in RO group 4, may be ROs with different time domain resource indexes in RO group 3 and RO group 4 (for example, may be an RO with a time domain resource index of 0 in RO group 3 and an RO with a time domain resource index of 1 in RO group 4), and the terminal device may transmit the selected preamble on the plurality of ROs associated with SSB1, respectively. Based on the example shown in table 4, the plurality of ROs associated with SSB1 may be 2 ROs in RO group 1, and the terminal device may transmit the selected preamble on the 2 ROs in RO group 1.

When the number of ROs in the RO group is greater than or equal to the number of repeated transmissions K, the terminal device may select K ROs in the RO group associated with the optimal SSB as ROs for repeated transmission of Msg1, select one preamble in the preamble index associated with the optimal SSB, and repeatedly transmit the preamble to the network device using the K ROs. For example, let k=3, the number of ROs in the RO group be 4. The RO associated with the optimal SSB includes a RO group 1, RO group 1 includes RO00, RO10, RO20 and RO30, the terminal device may select 3 ROs among the RO00, RO10, RO20 and RO30 for repeatedly transmitting Msg1, assume that the 3 ROs are RO00, RO10 and RO20, and select one preamble (assuming that the preamble is 1) in the preamble index corresponding to the optimal SSB, and repeatedly transmit the preamble 1 to the network device using the RO00, RO10 and RO 20. The preamble may be any one of preambles generated by the terminal device according to the configuration of the network device.

When the number of ROs in an RO group is smaller than the number of retransmission times K, since the number of ROs included in one RO group is insufficient for retransmission of Mag1, a plurality of RO groups associated with the optimal SSB are required to achieve K-time retransmission of Msg 1. For example, let k=3, the number of ROs in the RO group be 2. Based on the example shown in table 3, the RO associated with the optimal SSB (assumed to be SSB 0) includes RO group 1 and RO group 5, RO group 1 includes RO00, RO10, RO group 5 includes RO20, RO30, and the terminal device may select 3 ROs among RO00, RO10, RO20, and RO30 for repeatedly transmitting Msg1, assume that the 3 ROs are RO00, RO10, and RO20, and then select one preamble (assumed to be preamble 1) among the preamble indexes corresponding to the optimal SSB, and repeatedly transmit the preamble 1 to the network device using the RO00, RO10, and RO 20. The preamble may be any one of preambles generated by the terminal device according to the configuration of the network device.

S54, the network device sends Msg2.

S54 is an optional step. Optionally, S54 includes, in specific implementation: and sending Msg2 according to the mapping relation between the RO group and the SSB. Specifically, the network device may receive Msg1 on all ROs, determine an index of an SSB associated with the RO according to a mapping relationship between the RO group and the SSB (or a mapping relationship between ROs in the RO group and the SSB) after determining the received RO corresponding to the Msg1 from the terminal device, and then determine beam information according to the index of the SSB, so as to send Msg2 to the terminal device on the beam.

S55, the terminal equipment sends Msg3.

And S56, the network equipment transmits Msg4.

S55 and S56 are also optional steps, S55 being the transmission of Msg3. After receiving the Msg2, the terminal device sends an Msg3 to the network device. In some embodiments, a terminal device unique flag is included in Msg3 for conflict resolution. S56 is the transmission of Msg4, the network device carries in the collision resolution mechanism the flag in Msg4 for uniquely identifying the terminal device to indicate the winning terminal device, whereas the terminal device that is not winning in the collision resolution will re-initiate the random access.

As can be seen from the related description of the embodiment of fig. 5, when the random access procedure is enhanced, the Msg1 is repeatedly transmitted by using ROs with different time domain resource indexes, where the ROs with different time domain resource indexes are mapped to the same SSB. In the method, the RO and the SSB are mapped by taking the RO group as granularity, so that the RO in the same RO group is associated with the same SSB, and the time domain resource indexes of the RO in the same RO group are adjacent, thereby saving the time required by repeatedly transmitting the Msg1 and reducing the time of accessing the terminal equipment into the network equipment.

Assuming that Msg1 is sent by using SSB 0-associated RO, using the scheme illustrated in fig. 3 a-3 c, referring to fig. 3a, n=1/2, RO where two repeated transmissions are located is RO00 and RO40, respectively, using the scheme of the present application, referring to fig. 6b, l=1/2, RO where two repeated transmissions are located is RO00 and RO10, respectively, and the delay is only 1/4 of the scheme illustrated in fig. 3 a. Referring to fig. 3b, n=1, RO where two repeated transmissions are respectively RO00 and RO20, and with the scheme in this application, referring to fig. 6a, l=1, RO where two repeated transmissions are respectively RO00 and RO10, and the delay is 1/2 of the scheme illustrated in fig. 3 b. It can be seen that, compared with the schemes illustrated in fig. 3 a-3 c, the time delay of repeated transmission can be greatly reduced.

On the basis of any of the above embodiments, the solution of the present application will be further refined below.

In a specific implementation, S51 may be implemented in any one of the following modes one or two.

Mode one

The terminal device may determine a mapping relationship between the RO group and the SSB (or determine a mapping relationship between ROs in the RO group and the SSB) according to the first parameter, the second parameter, and the third parameter.

The value of the first parameter in the embodiment of the present application is the number of ROs in the RO group. The first parameter may be configured by the network device to the terminal device, e.g. the network device sends the first parameter to the terminal device via a system information block (System Information Blocks, SIB), i.e. the first parameter is included in the SIB. After receiving the SIB, the terminal equipment can acquire the first parameter according to the SIB.

In the case where the number of ROs in the RO group is equal to the number of repeated transmissions K, the value of the first parameter is K. The network device may configure the number of repeated transmissions K of Msg1 for the terminal device, so that the terminal device obtains the value of the number of repeated transmissions K of Msg 1. At this point, in one case, the network device may still configure the first parameter for the terminal device. For example, after configuring the number of repeated transmissions K of Msg1, the network device may configure the first parameter for the terminal device according to the number of repeated transmissions K, for example, when k=2, the value of the first parameter configured for the terminal device by the network device is also 2, and when k=4, the value of the first parameter configured for the terminal device by the network device is also 4. In another case, the setting may also be performed by the terminal device. Specifically, after obtaining the number of repeated transmissions K of Msg1, the terminal device may determine the first parameter according to the number of repeated transmissions K.

The second parameter is used for determining a mapping relation between the number of the SSB and the number of the RO groups, and the mapping relation between the SSB and the RO groups comprises the following several types: 1 SSB is mapped to a plurality of RO groups, 1 SSB is mapped to 1 RO group, and 1 RO group is mapped to a plurality of SSBs (specifically, each RO in 1 RO group is mapped to a plurality of SSBs). The specific mapping relationship may be indicated by a second parameter, i.e. the parameter L in the above embodiment.

Optionally, the value of the second parameter belongs to the set {1/8,1/4,1/2,1,2,4,8, 16}. When the value of the second parameter is less than 1 (i.e., L < 1), representing that 1 SSB can be mapped into 1/L RO groups; when the value of the second parameter is equal to 1 (l=1), representing that 1 SSB is mapped into 1 RO group; when the value of the second parameter is greater than 1 (L > 1), L SSBs may be mapped on behalf of 1 RO group (specifically, each RO in 1 RO group maps multiple SSBs).

The second parameter of the terminal device may be configured by the network device, for example, the second parameter may be carried in an SIB sent by the network device to the terminal device, or the second parameter of the terminal device may be preset, or specified by a protocol, or the network device and the terminal device negotiate to determine, which is not limited in this application.

The third parameter is used to determine the number of ROs over one time unit, i.e. over one time unit, over the frequency domain. For example, the third parameter may have a value of {1,2,4,8}. For example, when the value of the third parameter is 1, it means that there are 1 RO in the frequency domain in one time unit; when the value of the third parameter is 2, it means that there are 2 ROs in the frequency domain over one time unit.

Optionally, the third parameter is configured by the higher layer parameter msg 1-FDM. For example, in fig. 6a, the parameter msg 1-fdm=4, that is, the value of the third parameter is 4, which means that on the time domain resource corresponding to the 1 time domain resource index of RO, the number of the frequency domain resource indexes of RO is 4, and the 4 frequency domain resource indexes may be, for example, 0, 1,2, and 3. Taking the time domain resource index as 0 as an example, on the time domain resource identified by the index 0, there are 4 ROs with different frequency domain resources, and the indexes of the frequency domain resources of the 4 ROs are 0, 1,2, and 3 respectively.

The third parameter of the terminal device may be configured by the network device. For example, the third parameter of the terminal device may be carried in a SIB sent by the network device to the terminal device.

From the above, it is known that the network device may send SIB or other dedicated signaling or system message to the terminal device, and accordingly, the terminal device may receive SIB or other dedicated signaling or system message from the network device, where SIB may include at least one of the first parameter, the second parameter, and the third parameter. The SIB may be SIB1, for example.

When the values of the first parameters are different, the values of the third parameters may be the same or different. For example, when the first parameter is N1, the third parameter is M1; when the first parameter is N2, the third parameter is M2; n1 and N2 are different, and M1 and M2 are the same or different; wherein N1, N2, M1 and M2 are all positive integers.

In a specific implementation, the first implementation may include:

11 Determining the number of RO on a time unit according to the third parameter, and further determining the number and the position of RO in the PRACH configuration period;

12 Determining the number of ROs in one RO group according to the first parameter;

13 Determining the grouping result of the ROs according to the number of ROs in one RO group and the number and location of ROs in the PRACH configuration period;

14 And determining the mapping relation between the RO group and the SSB according to the grouping result of the RO and the mapping relation between the SSB indicated by the second parameter and the number of the RO groups.

It can be understood that, in step 11), when determining the number and the location of ROs in the PRACH configuration period, the terminal device needs other information besides the third parameter, for example, the time domain resource index of the RO, and the specific implementation may refer to the existing scheme and will not be described again.

In the specific implementation, the terminal device may start from the RO with the smallest frequency domain resource index and the time domain resource index, and perform the grouping of ROs according to the condition that the ROs need to satisfy (i.e. the frequency domain resource index is the same and the time domain resource indexes are adjacent).

Step 14) in specific implementation, it may be determined that 1 SSB maps several RO groups, or 1 RO group (or each RO in 1 RO group) maps several SSBs according to the mapping relationship between SSBs and the number of RO groups indicated by the second parameter. After determining the mapping relationship between the SSB and the number of RO groups, mapping between the RO groups (or ROs in the RO groups) and the SSB may be performed according to a preset mapping rule.

In the first embodiment, the preset mapping rule may be similar to the mapping rule 1 above, and only the RO needs to be replaced by the RO group for understanding, or may be different from the mapping rule 1 above, for example, the mapping rule 2 below may be used for mapping, or may be other mapping rules, which is not limited in this application.

In the first mode, after mapping by using the mapping rule, when the value of the second parameter is smaller than 1, the delay may be greater when the RO associated with the SSB is used to transmit the data. Optionally, the value of the second parameter is a positive integer. When the value of the second parameter is equal to 1 (l=1), representing that 1 SSB is mapped into 1 RO group; when the value of the second parameter is greater than 1 (L > 1), L SSBs may be mapped on behalf of 1 RO group (specifically, each RO in 1 RO group maps multiple SSBs).

On the one hand, for one SSB, the repeated transmission delay of ROs with different time domain resource indexes associated with the SSB may be larger. For example, in fig. 6b, assuming that k=4, the number of ROs in the RO group is 2 (i.e., the first parameter is 2), l=1/2 (i.e., the second parameter is 1/2), when mapping is performed, one SSB associates 2 RO groups, i.e., one SSB associates 4 ROs corresponding to 2 time domain resource indexes, and 4 ROs are needed to perform repeated transmission in the time domain, i.e., 4 ROs with different time domain resource indexes are needed, after performing data transmission on RO00 and RO10 associated with SSB0, data transmission is performed on RO associated with SSB0, and then, it is needed to perform transmission on RO80 and RO90, i.e., 6 ROs are needed to be passed in the time domain, which is a larger delay.

On the other hand, for one SSB, a larger latency may result when transmitting data on ROs that are associated with other SSBs. For example, in fig. 6b, assuming that k=2, the number of ROs in the RO group is 2 (i.e., the first parameter is 2), l=1/2 (i.e., the second parameter is 1/2), when mapping is performed, one SSB associates 2 RO groups, i.e., one SSB associates 4 ROs corresponding to 2 time domain resource indexes, and 2 ROs are needed to perform repeated transmission in the time domain, after performing data transmission on RO00 and RO10 associated with SSB0, if performing data transmission on RO associated with SSB4, it is needed to transmit on RO40 and RO50, i.e., 2 ROs need to pass in the time domain.

In order to further reduce the latency, the second parameter may take a value greater than or equal to 1 (i.e., the second parameter is a positive integer), at this time, it may be understood that, because the mapping is performed with the RO group as granularity, ROs in one RO group or multiple RO groups (all of the time domain resource indexes of ROs in the multiple RO groups are different) may meet the requirement of Msg1 for repeated transmission, so that the latency is avoided being greater when the SSB-associated ROs transmit data.

On the one hand, referring to fig. 6a, assuming that k=4, the number of ROs in the RO group is 2 (i.e., the first parameter is 2), let l=1 (i.e., the second parameter is 1), when mapping is performed, one SSB associates 1 RO group, i.e., one SSB associates 2 ROs corresponding to 2 time domain resource indexes, and 4 ROs are needed to perform repeated transmission in the time domain, i.e., 4 ROs with different time domain resource indexes corresponding to 2 RO groups are needed, after performing data transmission on RO00 and RO10 associated with SSB0, the ROs associated with SSB0 are needed to perform data transmission, and only 2 ROs are needed to be transmitted in the RO40 and RO50 in the time domain, so that the problem of a large delay when the ROs associated with SSB transmit data can be avoided.

On the other hand, for one SSB, referring to fig. 7, assuming that k=2, the number of ROs in the RO group is 2 (i.e., the first parameter is 2), let l=1 (i.e., the second parameter is 1), at this time, after data transmission is performed on the ROs 20 and 30 associated with the SSB0, if data transmission is performed on the ROs associated with the SSB4, it is necessary to transmit data on the ROs 40 and 50, i.e., on the time domain, without passing through other ROs, so that the problem of a larger delay when data is transmitted on the ROs associated with other SSBs can be avoided.

Mode two

The terminal device may determine a mapping relationship between the RO group and the SSB (or determine a mapping relationship between ROs in the RO group and the SSB) according to the first parameter, the third parameter, and the fourth parameter.

The fourth parameter is used for determining a mapping relation between the number of SSB and the number of RO. The fourth parameter is N above. The description of N is referred to above and will not be repeated. The explanation about the first parameter and the third parameter can be referred to in the first mode, and will not be repeated.

In the second mode, optionally, the network device may send SIB or other dedicated signaling or system message to the terminal device, and correspondingly, the terminal device may receive SIB or other dedicated signaling or system message from the network device, where SIB may include at least one of the first parameter, the third parameter, and the fourth parameter. The SIB may be SIB1, for example. The parameters that the network device does not configure for the terminal device may be preset in the terminal device, or specified by a protocol, which is not limited in the present application.

In a specific implementation, the second mode may include:

21 Determining the number of RO on a time unit according to the third parameter, and further determining the number and the position of RO in the PRACH configuration period;

22 Determining the number of ROs in one RO group according to the first parameter;

23 Determining a mapping relation between the number of SSB and RO according to the fourth parameter;

24 Determining the mapping relation between the RO group and the SSB according to the mapping relation between the SSB and the number of the RO in one RO group.

Wherein, the relevant description of step 21) can be found in the above step 11).

Step 24) in a specific implementation, after the mapping relationship between the number of SSBs and ROs is obtained, the number of ROs in one RO group may be determined according to the first parameter, so that several ROs may be determined to be one RO group, and further, the mapping relationship between the number of SSBs and the number of RO groups may be determined. The terminal device may further perform grouping of ROs according to the condition that the ROs need to satisfy starting from the RO with the smallest frequency domain resource index and the time domain resource index, and then perform mapping between the RO group (or the ROs in the RO group) and the SSB according to a preset mapping rule.

In the second mode, the preset mapping rule may be the mapping rule 2 or the mapping rule 3, or may be another mapping rule, which is not limited in this application.

In the second mode, after mapping by using the mapping rule, a larger delay may be caused when the data is transmitted by using the RO associated with the SSB.

On the one hand, for one SSB, the repeated transmission delay of ROs with different time domain resource indexes associated with the SSB may be larger. For example, in fig. 6b, assuming that k=4, the number of ROs in the RO group is 2 (i.e., the first parameter is 2), n=1/4 (i.e., the fourth parameter is 1/4), that is, when mapping is performed, 1 SSB associates 4 ROs, that is, 1 SSB associates 2 RO groups, and 4 ROs in the 2 RO groups correspond to 2 time domain resource indexes, and 4 ROs are needed to perform retransmission in the time domain, that is, 4 ROs with different time domain resource indexes are needed, then after performing data transmission on RO00 and RO10 associated with SSB0, data transmission is performed again on RO80 and RO90, that is, 6 ROs are needed to be transmitted in the time domain, and the time delay is large.

On the other hand, for one SSB, a larger latency may result when transmitting data on ROs that are associated with other SSBs. For example, in fig. 6b, let k=2, the number of ROs in the RO group be 2 (i.e. the first parameter be 2), n=1/4 (i.e. the fourth parameter be 1/4), i.e. when mapping is performed, 1 SSB associates 4 ROs, i.e. 1 SSB associates 2 RO groups, 4 ROs in the two RO groups correspond to 2 time domain resource indexes, and 2 ROs are needed in the time domain for repeated transmission, and after data transmission is performed on RO00 and RO10 associated with SSB0, if data transmission is performed on RO associated with SSB4, it is needed to transmit on RO40 and RO50, i.e. 2 ROs are needed in the time domain.

In order to further reduce the delay, the value of the first parameter and the value of the fourth parameter may be multiplied by 1, so as to ensure that ROs in one RO group or multiple RO groups (the time domain resource indexes of ROs in multiple RO groups are all different) can meet the requirement of Msg1 for repeated transmission, thereby avoiding a larger delay when SSB-associated ROs transmit data.

On the one hand, referring to fig. 6a, let k=4, the number of ROs in the RO group be 2 (i.e. the first parameter be 2), let n=1/2 (i.e. the fourth parameter be 1/2), i.e. when mapping is performed, 1 SSB associates 2 ROs, i.e. one SSB associates 1 RO group, and 4 ROs are needed to perform repeated transmission in the time domain, after performing data transmission on RO00 and RO10 associated with SSB0, the RO associated with SSB0 needs to perform data transmission, and only 2 ROs need to be passed through in the RO40 and RO50 in the time domain, so that the problem of a larger time delay when the SSB associated ROs transmit data can be avoided.

On the other hand, referring to fig. 7, let k=2, the number of ROs in the RO group be 2 (i.e. the first parameter be 2), let n=1/2 (i.e. the fourth parameter be 1/2), that is, when mapping is performed, 1 SSB associates 2 ROs, that is, one SSB associates 1 RO group, and 2 ROs are needed to perform repeated transmission in the time domain, after data transmission is performed on RO20 and RO30 associated with SSB0, if data transmission is performed on RO associated with SSB4, it is needed to transmit on RO40 and RO50, that is, other ROs are not needed in the time domain, so that the problem of a larger time delay when data is transmitted on RO associated with other SSBs can be avoided.

In this case, if the SIB sent by the network device does not include the fourth parameter, the terminal device may determine the fourth parameter according to the first parameter included in the SIB. Specifically, the network device sends an SIB to the terminal device, and correspondingly, the terminal device receives the SIB from the network device, wherein the SIB comprises a first parameter; the terminal device determines a fourth parameter according to the first parameter.

In the above embodiments, how the terminal device determines the mapping relationship between the RO group and the SSB is described below with reference to the accompanying drawings.

The mapping procedure of the first RO group and SSB (which may be denoted as mapping rule 2) is as follows:

31 First, in one RO, the order of the preamble indexes corresponding to the ROs is incremented.

32 Secondly, mapping the RO and the SSB in the RO groups according to the granularity of the RO groups, and for one RO group, mapping the SSB which is sequentially associated with the RO groups according to the sequence from small to large of the time domain resource index of the RO in the RO groups.

33 Next, for the RO groups having the same time domain resource index, the RO groups and SSBs are mapped in order of the RO groups from the smaller frequency domain resource index to the larger frequency domain resource index.

34 Again, in PRACH slots, the time domain resource indexes of the RO groups are mapped with SSBs in order from small to large.

35 Finally, mapping the RO group and the SSB in sequence from small to large according to the index of the PRACH time slot.

In step 31), the number of preambles available on each ROConfigured by a higher layer parameter total number of RA-Preamble, each R is typicallyThe number of the preambles in the O is 64, and the preamble indexes of the 64 preambles are different, so that the process of transmitting Msg1 by the terminal device is the process of transmitting the preamble to the network device. When Msg1 is transmitted using the SSB-associated RO, one preamble can be arbitrarily selected from among 64 preambles.

The mapping procedure of step 32) -step 35) is exemplified below by way of an example.

Referring to fig. 6a, assuming that the number of repeated transmissions k=2, each RO group includes two ROs, l=1 (or n=1/2), 16 ROs, 8 RO groups are shown in total, and each RO group can be seen in table 2.

For each RO group, mapping is sequentially performed with the SSB according to the sequence from small to large of the time domain resource indexes of the RO in the RO group. For example, SSB0 maps to RO group 1, and for RO group 1, it maps to SSB0 sequentially in the order RO00 to RO10, i.e., RO00 and RO10 are both associated with SSB 0. Other RO groups are similarly mapped.

And for the RO groups with the same time domain resource index, mapping the RO groups and the SSB in sequence according to the sequence of the frequency domain resource indexes of the RO groups from small to large. For example, for RO group 1 to RO group 4, the mapping is sequentially performed with SSB0, SSB1, SSB2, and SSB3 in the order of RO group 1→ro group 2→ro group 3→ro group 4, i.e., RO group 1 is associated with SSB0, RO group 2 is associated with SSB1, RO group 3 is associated with SSB2, and RO group 4 is associated with SSB 3.

And in the PRACH time slot, mapping with the SSB in sequence from small to large according to the time domain resource index of the RO group. For example, assuming that 16 ROs shown in the figure are ROs within one PRACH slot, for RO group 1 to RO group 4, SSB0, SSB1, SSB2, and SSB3 are mapped sequentially in the order of RO group 1→ro group 2→ro group 3→ro group 4, and for RO group 5 to RO group 8, SSB4, SSB5, SSB6, and SSB7 are mapped sequentially in the order of RO group 5→ro group 6→ro group 7→ro group 8.

And mapping the RO groups and the SSB sequentially according to the index of the PRACH time slot from small to large. For example, assuming that 16 ROs shown in the figure are ROs within one PRACH slot, for the next PRACH slot, for RO group 9 to RO group 12, the sequence of RO group 9→ro group 10→ro group 11→ro group 12 is mapped with SSB0, SSB1, SSB2, and SSB3 in order, and for RO group 13 to RO group 16, the sequence of RO group 13→ro group 14→ro group 15→ro group 16 is mapped with SSB4, SSB5, SSB6, and SSB7 in order.

The mapping process according to the steps 32) to 35) is described above as an example, and the mapping process is described below according to the sequence of the time domain resource index and the frequency domain resource index.

According to the mapping sequence, SSB0 is mapped first. On the RO group with the smallest frequency domain resource index (i.e., the frequency domain resource index is 0 in fig. 6 a), SSB0 is mapped in sequence from the smaller time domain resource index to the larger time domain resource index. After all the ROs in the RO group with the smallest frequency domain resource index are mapped, adding the frequency domain resource index to obtain the RO group with the frequency domain resource index of 1 and the time domain resource index of 0-1, and then sequentially mapping the SSB1 according to the sequence from the small time domain resource index to the large time domain resource index. Similarly, after all the ROs in the RO group with the frequency domain resource index of 1 are mapped, adding the frequency domain resource index to obtain the RO group with the frequency domain resource index of 2 and the time domain resource index of 0-1, and then sequentially mapping SSB2 according to the sequence from small to large of the time domain resource indexes. After all the ROs in the RO group with the frequency domain resource index of 2 are mapped, adding the frequency domain resource index to obtain the RO group with the frequency domain resource index of 3 and the time domain resource index of 0-1, and then sequentially mapping the SSB3 according to the sequence from the small time domain resource index to the large time domain resource index.

And when the RO groups with the same time domain resource index are aimed at, mapping the RO groups and the SSB according to the sequence from small to large of the frequency domain resource indexes of the RO groups, the time domain resource indexes can be increased to obtain new RO groups, and mapping is carried out according to the sequence from small to large of the time domain resource indexes of the RO groups and the SSB.

Still taking fig. 6a as an example, in the above embodiment, the mapping process of each RO group with a time domain resource index of 0 to 1 and SSB is described,

after the mapping is completed, adding a time domain resource index to obtain new RO groups, namely RO groups with the time domain resource index of 2-3, and then carrying out the mapping process of the RO groups with the time domain resource index of 2-3 and SSB. The mapping process of each RO group with 2-3 time domain resource indexes and SSB is similar to the mapping process of each RO group with 0-1 time domain resource indexes and SSB, namely, firstly, SSB4 is mapped to the RO group with 2-3 time domain resource indexes and 0 frequency domain resource indexes, SSB5 is mapped to the RO group with 2-3 time domain resource indexes and 1 frequency domain resource indexes, SSB6 is mapped to the RO group with 2-3 time domain resource indexes and 2 frequency domain resource indexes, and SSB7 is mapped to the RO group with 2-3 time domain resource indexes and 3 frequency domain resource indexes. The specific mapping process may be referred to the description of the above embodiment, and will not be repeated here.

The mapping procedure (which may be denoted as mapping rule 3) of the second RO group (assuming that the number of ROs included in the RO group is W) with SSB is as follows:

41 First, in one RO, the order of the preamble indexes corresponding to the ROs is incremented.

42 Next, let j=0, k=0, i=0, and ROjk, RO (j+1) k, RO (j+2) k, …, RO (j+w-1) k are mapped to SSBi.

43 Let k=k+1, i=i+1, determine if k is equal to k '+1 (k' is the maximum frequency domain resource index of RO);

if so, let k=0, j=j+w, determine if i is equal to 8, if so, let i=0, map ROjk, RO (j+1) k, RO (j+2) k, …, RO (j+w-1) k to SSBi, and if not, map ROjk, RO (j+1) k, RO (j+2) k, …, RO (j+w-1) k to SSBi;

if not, it is determined whether i is equal to 8, if so, let i=0, and map ROjk, RO (j+1) k, RO (j+2) k, …, RO (j+w-1) k to SSBi, and if not, map ROjk, RO (j+1) k, RO (j+2) k, …, RO (j+w-1) k to SSBi.

44 Repeating step 43)

The mapping procedure of step 42) -step 44) is exemplified below by way of an example.

Referring to fig. 6a, assuming that the number of repeated transmissions k=2, w=2, n=1/2, the maximum frequency domain resource index of ROs is 3, 16 ROs are shown in total. The mapping procedure is:

Let j=0, k=0, i=0, map RO00, RO10 to SSB0;

let k=k+1=1, i=i+1=1, determine if k=1 is equal to 4 (i.e. 3+1), and if not, map RO01, RO11 to SSB1;

let k=k+1=2, i=i+1=2, determine if k=2 is equal to 4, and if not, map RO02, RO12 to SSB2;

let k=k+1= 3,i =i+1=3, determine whether k=3 is equal to 4, and if not, map RO03, RO13 to SSB3;

let k=k+1=4, i=i+1=4, determine if k=4 is equal to 4, if so, let k=0, j=j+2=2, determine if i is equal to 8, if not, map RO20, RO30 to SSB4;

let k=k+1=1, i=i+1=5, determine if k=1 is equal to 4, and if not, map RO21, RO31 to SSB5;

let k=k+1=2, i=i+1=6, determine if k=2 is equal to 4, and if not, map RO22, RO32 to SSB6;

let k=k+1= 3,i =i+1=7, determine if k=3 is equal to 4, and if not, map RO23, RO33 to SSB7;

let k=k+1=4, i=i+1=8, determine if k=4 is equal to 4, if so, let k=0, j=j+2=4, determine if i is equal to 8, if so, let i=0, map RO40, RO50 to SSB0;

And mapping is carried out sequentially.

It should be noted that, the mapping rules mentioned in the foregoing embodiments of the present application are merely examples, and the mapping rules (for example, the order of SSB, the order of RO groups, the order of ROs, etc. when they are actually implemented) may be other, which is not limited in the present application.

How the mapping of RO groups and SSBs is performed is described in the above embodiments, and the procedure is exemplified in connection with fig. 7 and 8.

Fig. 7 is a schematic diagram of a mapping relationship between RO groups and SSB after RO resources are divided according to the number of repeated transmissions, as shown in fig. 7, in which a network device configures, for a terminal device, a mapping relationship L (e.g., SSB-perRACH-transmission=1) between SSB and the number of RO groups by a higher layer parameter (i.e., a second parameter, such as a parameter SSB-perRACH-transmission=1), and the number of RO frequency domain resource indexes of RO configured for the terminal device are respectively index 0, index 1, index 2, index 3, index 4, index 5, index 6, index 7, index 8, index 9, index 10, index 11, index 12, index 13, … …, and in which, in fig. 7, msg 1-fdm=4, i.e., on 1 time domain resource, the number of RO frequency domain resource indexes is 4, and the 4 frequency domain resource indexes are respectively index 0, index 1, index 2, index 3, index 2, index 5, and index … …. The time domain resources identified by the two adjacent time domain resource indexes can be continuous or discontinuous. After determining the number of repeated transmissions K of Msg1, the RO group may be divided according to the number of repeated transmissions K. For example, in fig. 7, when the number of repeated transmissions k=1, dividing ROs to obtain a plurality of RO groups, each RO group including 1 RO, each RO group may be illustrated by referring to a dashed box in k=1 in fig. 7; when the number of repeated transmissions k=2, each RO group includes 2 ROs with the same frequency domain resource index and adjacent time domain resource indexes, which can be illustrated in a dashed box when k=2 in fig. 7; when the number of repeated transmissions k=4, each RO group includes 4 ROs having the same frequency domain resource index and adjacent time domain resource indexes, as shown in the dashed box when k=2 in fig. 7.

Assuming that there are at least 8 SSBs in a cell, SSB indexes are SSB0, SSB1, SSB2, …, SSB7, respectively, and according to the above mapping rule, the mapping relationship between SSB and RO groups is as shown in fig. 7:

when the number of repeated transmissions of Msg1 is 1 (k=1), the RO group includes 1 RO in the time domain, and because Msg 1-fdm=4, 2 ROs (index 0 to index 1) in the time domain are required for mapping a group SSB.

When the number of retransmission times of Msg1 is 2 (k=2), the RO group includes 2 ROs in the time domain, and ROs in the RO group are mapped sequentially in the time domain, and because Msg 1-fdm=4, 4 ROs (index 2 to index 5) in the time domain are required for mapping a group of SSBs.

When the number of retransmission times of Msg1 is 4 (k=4), the RO group includes 4 ROs in the time domain, and ROs in the RO group are mapped sequentially in the time domain, and because Msg 1-fdm=4, 8 ROs (index 6 to index 13) in the time domain are required for mapping a group of SSBs.

Optionally, the embodiments of the present application further support configuring different second parameters and third parameters for different first parameters. This will be described below in connection with fig. 8.

Fig. 8 is a second schematic diagram of mapping relationship between RO groups and SSB after dividing RO resources according to the number of repeated transmissions, as shown in fig. 8, for different first parameters, support configuration of different second parameters, and support configuration of different third parameters (i.e., msg1-FDM values).

Assuming that the value of the first parameter is the number K of repeated transmissions, the number of UEs configured under the number K of repeated transmissions of different Msg1 is considered to be different, or the network may configure different Msg1-FDM values under the number K of repeated transmissions of different Msg1 or may configure different second parameters based on consideration of other factors.

First, after determining the number of repeated transmissions K of Msg1, the RO group may be divided according to the number of repeated transmissions K. For example, in fig. 8, when the number of repeated transmissions k=1, dividing ROs to obtain a plurality of RO groups, each RO group including 1 RO, each RO group may be illustrated by referring to a dashed box in k=1 in fig. 8; when the number of repeated transmissions k=2, each RO group includes 2 ROs with the same frequency domain resource index and adjacent time domain resource indexes, which can be illustrated in a dashed box when k=2 in fig. 8; when the number of repeated transmissions k=4, each RO group includes 4 ROs having the same frequency domain resource index and adjacent time domain resource indexes, as shown in the dashed box when k=2 in fig. 8.

As shown in fig. 8, when the number of repeated transmissions of Msg1 is 1 (k=1), assuming that l=1 or n=1, and Msg 1-fdm=4, each RO group includes 1 RO, the terminal device may, for example, select SSB1 to transmit Msg1, where SSB1 maps to an RO group with a time domain resource index of 0 and a frequency domain resource index of 1, where the RO group includes 1 RO;

When the number of repeated transmission times of Msg1 is 2 (k=2), assuming that l=1 or n=1/2, msg 1-fdm=8, each RO group includes 2 ROs, for example, the terminal device may select SSB1 to transmit Msg1, where SSB1 maps to an RO group with a time domain resource index of 2-3 and a frequency domain resource index of 1, where the RO group includes 2 ROs;

when the number of repeated transmissions of Msg1 is 4 (k=4), assuming that l=2 and Msg 1-fdm=4, each RO group includes 4 ROs, the terminal device may, for example, select SSB1 to transmit Msg1, where SSB1 maps to an RO group with a time domain resource index of 4 to 7 and a frequency domain resource index of 0, where the RO group includes 4 ROs.

In summary, in the scheme of the embodiment of the present application, when enhancing the random access procedure, for the scenario that the Msg1 is repeatedly transmitted by using ROs with different time domain resource indexes, where the ROs with different time domain resource indexes are mapped to the same SSB, the mapping of the ROs and the SSB is performed with the RO group as granularity, so that ROs in the same RO group are associated with the same SSB, and the time domain resource indexes of ROs in the same RO group are adjacent, so that the time required for repeatedly transmitting the Msg1 can be saved, and the time for accessing the terminal device to the network device is reduced.

It should be noted that, in the configurations related to L and N mentioned in the foregoing embodiments, other parameter configurations may be adopted in actual implementation, and even if the ssb-perRACH-action configuration is adopted at present, it may be changed to other names in future protocols or related descriptions, so the foregoing configuration adopting the ssb-perRACH-action configuration is merely an example for convenience of understanding, and should not be considered as limiting the configurations of L and N in the present application.

All parameters configured by the network device used in the embodiment of the present application may have the situation of changing the name, but the meaning referred to is unchanged.

Fig. 9 is a schematic structural diagram of a communication device provided in an embodiment of the present application, as shown in fig. 9, the communication device 90 includes:

and a transceiver module 91, configured to repeatedly transmit a random access request message to a network device according to a mapping relationship between an RO group and an SSB, where the frequency domain resource indexes of ROs in the RO group are the same, the number of ROs in the RO group is greater than 1, and the ROs in the RO group are a plurality of ROs adjacent to the time domain resource indexes.

In one possible implementation, the transceiver module 91 is further configured to:

In one possible embodiment, the second parameter is a positive integer.

receiving a SIB from the network device, the SIB including the first parameter;

and determining the fourth parameter according to the first parameter.

when the first parameter is N2, the third parameter is M2;

wherein N1, N2, M1 and M2 are positive integers.

first, in one RO, the order of the preamble indexes corresponding to the ROs is incremented;

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

The communication device 90 provided in this embodiment of the present application is configured to perform the above-mentioned method embodiment, and its implementation principle and technical effects are similar, and this embodiment is not repeated here.

The communication device 90 in this embodiment may be a chip, a chip module, a hardware module, a processor, or the like. Of course, the communication device 90 may take other forms, which are not particularly limited in the embodiments of the present application.

Fig. 10 is a second schematic structural diagram of a communication device according to an embodiment of the present application, as shown in fig. 10, the communication device 100 includes:

a receiving module 101, configured to receive a random access request message;

and a sending module 102, configured to send a random access response message according to a mapping relationship between an RO group and an SSB, where the frequency domain resource indexes of ROs in the RO group are the same, the number of ROs in the RO group is greater than 1, and the ROs in the RO group are a plurality of ROs adjacent to the time domain resource index.

In one possible implementation, the sending module 102 is further configured to:

In one possible embodiment, the second parameter is a positive integer.

when the first parameter is N2, the third parameter is M2;

wherein N1, N2, M1 and M2 are positive integers.

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

The communication device 100 provided in the embodiment of the present application is configured to execute the above-mentioned method embodiment, and its implementation principle and technical effects are similar, and this embodiment is not repeated here.

The communication device 100 in the embodiment of the present application may be a chip, a chip module, a hardware module, a processor, or the like. Of course, the communication device 100 may take other forms, which are not particularly limited in the embodiments of the present application.

The embodiment of the application provides a chip, where the chip includes a processor, and the processor may be configured to execute computer-executed instructions stored in a memory, so as to implement the communication method described in any of the above embodiments of the application (for example, according to a mapping relationship between the RO group and the SSB, a random access request message is repeatedly transmitted to a network device, where the frequency domain resource indexes of ROs in the RO group are the same, the number of ROs in the RO group is greater than 1, and ROs in the RO group are a plurality of ROs adjacent to the time domain resource index). Alternatively, the memory storing the computer-executable instructions may be a memory internal to the chip or may be a memory external to the chip.

The embodiment of the application provides a chip, which includes a processor, and the processor may be configured to execute computer-executed instructions stored in a memory, so as to implement the communication method (e.g. receive a random access request message; send a random access response message according to a mapping relationship between an RO group and an SSB), where the frequency domain resource indexes of ROs in the RO group are the same, the number of ROs in the RO group is greater than 1, and ROs in the RO group are a plurality of ROs adjacent to the time domain resource indexes). Alternatively, the memory storing the computer-executable instructions may be a memory internal to the chip or may be a memory external to the chip.

With respect to each of the apparatuses and each of the modules/units included in the products described in the above embodiments, it may be a software module/unit, a hardware module/unit, or a software module/unit, and a hardware module/unit. For example, for each device or product applied to or integrated on a chip, each module/unit included in the device or product may be implemented in hardware such as a circuit, or at least part of the modules/units may be implemented in software program, where the software program runs on a processor integrated inside the chip, and the rest (if any) of the modules/units may be implemented in hardware such as a circuit; for each device and product applied to or integrated in the chip module, each module/unit contained in the device and product can be realized in a hardware manner such as a circuit, different modules/units can be located in the same component (such as a chip, a circuit module and the like) or different components of the chip module, or at least part of the modules/units can be realized in a software program, the software program runs on a processor integrated in the chip module, and the rest (if any) of the modules/units can be realized in a hardware manner such as a circuit; for each device and product applied to or integrated in the terminal device/network device, each module/unit included in the device/network device may be implemented in hardware such as a circuit, and different modules/units may be located in the same component (e.g. a chip, a circuit module, etc.) or different components in the terminal device/network device, or at least part of the modules/units may be implemented in a software program, where the software program runs on a processor integrated in the terminal device/network device, and the remaining (if any) part of the modules/units may be implemented in hardware such as a circuit.

Fig. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application. Referring to fig. 11, the terminal device 110 may include: a transceiver 111, a memory 112, a processor 113. The transceiver 111 may include: a transmitter and/or a receiver. The transmitter may also be referred to as a transmitter, transmit port, transmit interface, or the like, and the receiver may also be referred to as a receiver, receive port, receive interface, or the like. Illustratively, the transceiver 111, the memory 112, and the processor 113 are interconnected by a bus 114.

Memory 112 is used to store program instructions;

the processor 113 is configured to execute the program instructions stored in the memory, so as to cause the terminal device 110 to execute any of the communication methods described above.

Wherein the receiver of the transceiver 111 may be used to perform the receiving function of the terminal device in the above communication method.

Fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application. Referring to fig. 12, the network device 120 may include: a transceiver 121, a memory 122, a processor 123. The transceiver 121 may include: a transmitter and/or a receiver. The transmitter may also be referred to as a transmitter, transmit port, transmit interface, or the like, and the receiver may also be referred to as a receiver, receive port, receive interface, or the like. Illustratively, the transceiver 121, the memory 122, and the processor 123 are interconnected by a bus 124.

Memory 122 is used to store program instructions;

the processor 123 is configured to execute the program instructions stored in the memory, so as to cause the network device 120 to perform any of the communication methods described above.

Wherein the receiver of the transceiver 121 may be used to perform the receiving function of the network device in the above-mentioned communication method.

Embodiments of the present application provide a computer-readable storage medium having stored therein computer-executable instructions for implementing the above-described communication method when the computer-executable instructions are executed by a processor.

Embodiments of the present application may also provide a computer program product, where the computer program product may be executed by a processor, and when the computer program product is executed, may implement a multicast service processing method executed by any of the above-described terminal devices.

The transmission device, the computer readable storage medium and the computer program product in the embodiments of the present application may execute the communication method executed by the network device, and specific implementation processes and beneficial effects of the communication method are referred to above and are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The aforementioned computer program may be stored in a computer readable storage medium. The computer program, when executed by a processor, implements steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of communication, comprising:

and repeatedly transmitting a random access request message to the network equipment according to the mapping relation between the random access opportunity RO group and the synchronous signal block SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is larger than 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes.

2. The method of claim 1, wherein the number of ROs in the RO group is the same as the number of repeated transmissions of the random access request message K, where K is a positive integer.

3. The method according to claim 1 or 2, wherein the mapping relationship of the RO group and SSB is determined by a first parameter, a second parameter and a third parameter;

4. A method according to claim 3, characterized in that the method further comprises:

a system information block, SIB, is received from the network device, the SIB including at least one of the first parameter, the second parameter, and the third parameter.

5. The method of claim 3 or 4, wherein the second parameter is a positive integer.

6. The method according to claim 1 or 2, wherein the mapping relationship of the RO group and SSB is determined by a first parameter, a third parameter and a fourth parameter;

7. The method of claim 6, wherein the method further comprises:

8. The method of claim 6, wherein the method further comprises:

receiving a SIB from the network device, the SIB including the first parameter;

and determining the fourth parameter according to the first parameter.

9. The method according to any of claims 6-8, wherein the value of the first parameter and the value of the fourth parameter are multiplied by 1.

10. The method according to any one of claims 3-9, wherein when the first parameter is N1, the third parameter is M1;

when the first parameter is N2, the third parameter is M2;

wherein N1, N2, M1 and M2 are positive integers.

11. The method according to any of claims 3-10, wherein the mapping procedure of the RO group with the SSB comprises:

thirdly, mapping with the SSB in sequence from small to large according to the time domain resource index of the RO group in the PRACH time slot of the physical random access channel;

12. The method according to any of claims 2-11, wherein the number of repeated transmissions K of the random access request message is such that:

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

13. A method of communication, comprising:

receiving a random access request message;

and sending a random access response message according to the mapping relation between the random access opportunity RO group and the synchronous signal block SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is larger than 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes.

14. The method of claim 13, wherein the number of ROs in the RO group is the same as the number of repeated transmissions of the random access request message K, where K is a positive integer.

15. The method according to claim 13 or 14, wherein the mapping relationship of the RO group and SSB is determined by a first parameter, a second parameter and a third parameter;

16. The method of claim 15, wherein the method further comprises:

and sending a System Information Block (SIB) to the terminal equipment, wherein the SIB comprises at least one of the first parameter, the second parameter and the third parameter.

17. The method according to claim 15 or 16, wherein the second parameter is a positive integer.

18. The method according to claim 13 or 14, wherein the mapping relationship of the RO group and SSB is determined by a first parameter, a third parameter and a fourth parameter;

19. The method of claim 18, wherein the method further comprises:

20. The method according to claim 18 or 19, wherein the value of the first parameter and the value of the fourth parameter are multiplied by 1.

21. The method according to any one of claims 15-20, wherein when the first parameter is N1, the third parameter is M1;

when the first parameter is N2, the third parameter is M2;

wherein N1, N2, M1 and M2 are positive integers.

22. The method of any of claims 15-21, wherein the mapping procedure of the RO group with the SSB comprises:

23. The method according to any of claims 14-22, wherein the number of repeated transmissions K of the random access request message is such that:

K∈{1,2,4,...,2 ⁿ and n is an integer greater than or equal to 0.

24. A communication device, comprising:

and the receiving and transmitting module is used for repeatedly transmitting a random access request message to the network equipment according to the mapping relation between the random access opportunity RO group and the synchronous signal block SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is larger than 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes.

25. A communication device, comprising:

a receiving module, configured to receive a random access request message;

And the sending module is used for sending a random access response message according to the mapping relation between the random access opportunity RO group and the synchronous signal block SSB, wherein the frequency domain resource indexes of the RO in the RO group are the same, the number of the RO in the RO group is larger than 1, and the RO in the RO group is a plurality of adjacent RO with the time domain resource indexes.

26. A terminal device, comprising: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing computer-executable instructions stored in the memory cause the at least one processor to perform the method of any one of claims 1-12.

27. A network device, comprising: at least one processor and memory;

the memory stores computer-executable instructions;

the at least one processor executing computer-executable instructions stored in the memory cause the at least one processor to perform the method of any one of claims 13-23.

28. A computer readable storage medium having stored therein computer executable instructions which when executed by a computer implement the method of any of claims 1-23.

29. A computer program product comprising a computer program, characterized in that the computer program, when run by a computer, causes the communication method of any one of claims 1-12 or claims 13-23 to be performed.