WO2024027306A1

WO2024027306A1 - Prach transmitting method, receiving method, terminal, and network device

Info

Publication number: WO2024027306A1
Application number: PCT/CN2023/096807
Authority: WO
Inventors: 沈姝伶; 邢艳萍; 费永强; 高雪娟
Original assignee: 大唐移动通信设备有限公司
Priority date: 2022-08-02
Filing date: 2023-05-29
Publication date: 2024-02-08
Also published as: CN117560785A

Abstract

The present disclosure relates to the technical field of communications. Provided are a PRACH transmitting method, a receiving method, a terminal, and a network device. The transmitting method comprises: a terminal determines a mapping relationship between an SSB set and an RO group, wherein one SSB set comprises at least one SSB, and one RO group comprises at least one RO; according to the mapping relationship, the terminal selects an RO group set associated with one SSB or an RO group set associated with a plurality of SSBs as a transmission resource for a PRACH, wherein the RO group set comprises at least one RO group; and the terminal performs multiple PRACH transmissions according to the selected RO group set.

Description

PRACH transmission method, reception method, terminal and network equipment

Cross-references to related applications

This disclosure claims priority to Chinese Patent Application No. 202210922668.6 filed in China on August 2, 2022, the entire content of which is incorporated herein by reference.

Technical field

The present disclosure relates to the field of communication technology, and in particular to a PRACH transmission method, receiving method, terminal and network equipment.

Background technique

In related technology, the Physical Random Access Channel (PRACH) does not support repeated transmission. That is, in the process of trying random access, the terminal (User Equipment, UE) first selects a suitable synchronization signal/physical broadcast channel signal block (Synchronization Signal and PBCH block, SSB), and then selects the random channel access opportunity associated with the SSB. (RACH Occasion, RO) Select an RO to send a PRACH. If an SSB is associated with multiple ROs, the terminal can randomly select one of the multiple ROs.

Furthermore, coverage enhancement proposes a multi-PRACH transmission solution, that is, when the UE attempts random access, multiple PRACHs need to be sent in multiple ROs to improve the transmission performance of PRACH. Currently, the mapping relationship between SSB and RO in multi-PRACH transmission scenarios has not been specified, nor has it been determined how multi-PRACH selects multiple ROs for transmission.

Contents of the invention

The purpose of the embodiments of the present disclosure is to provide a PRACH transmission method, a receiving method, a terminal and a network device, so as to solve the problem of how to perform multi-PRACH transmission that is not specified in related technologies.

In order to solve the above problems, embodiments of the present disclosure provide a transmission method for the physical random access channel PRACH. The method includes:

The terminal determines the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group package Include at least one RO;

The terminal selects one SSB-associated RO group set or multiple SSB-associated RO group sets as transmission resources of the PRACH according to the mapping relationship; the RO group set includes at least one RO group;

The terminal performs multiple PRACH transmissions according to the selected RO group set.

Optionally, the method also includes:

The terminal determines the number of ROs included in an RO group to be M based on the number M of PRACHs continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, N is the number of SSBs associated with an RO, and N is greater than 0.

Optionally, the method also includes:

The terminal determines the indexes of the M ROs in one RO group in the order of increasing the time domain resource index of the RO group in the first PRACH time slot and then increasing the PRACH time slot index.

Optionally, the method also includes:

The terminal determines the number of ROs included in an RO group to be M*max(1,1/N) based on the number M of PRACHs continuously transmitted using time division multiplexing and the number N of SSBs associated with an RO;

Among them, one SSB occupies one RO group for one mapping, M is an integer greater than or equal to 1; N is greater than 0.

Optionally, the method also includes:

The terminal determines M*max(1,1/N) in an RO group in the order of increasing the frequency domain resource index first, then increasing the time domain resource index of the RO group in the next PRACH time slot, and finally increasing the PRACH time slot index. The index of an RO.

Optionally, the value of M is less than or equal to the value of K;

Wherein, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.

Optionally, the terminal determines the mapping relationship between the SSB set and the RO group, including:

The terminal maps each SSB in the SSB set to the RO group in a first order to obtain the mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is incremented, then the frequency domain resource index is incremented, and then a PRACH The RO group time slot resource index in the time slot increases; the order in which the last PRACH time slot index increases.

Optionally, the SSB set includes: all SSBs on the network side, or some SSBs on the network side.

Optionally, when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Wherein, the initial SSB is an SSB selected by the terminal that meets the access conditions during the random access process.

Optionally, when an SSB-associated RO group set is used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/M times of round-robin mapping of all SSBs in the SSB set, where n is an integer greater than or equal to 1;

or,

When multiple SSB-associated RO group sets are used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, Where n is an integer greater than or equal to 1;

Wherein, M is the number of PRACHs that are continuously transmitted using time division multiplexing, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the SSB. The number of all SSBs in the set.

Optionally, in the case where the number of frequency domain ROs occupied by all SSB round robin mappings included in the SSB set is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain are no longer used for the next SSB round robin. mapping.

Optionally, when all the SSBs included in the SSB set are not mapped to an integer number of RO groups in one round, the remaining preamble in the last RO group is no longer used for the next SSB round mapping.

Optionally, the selected RO group set associated with an SSB is: an RO group set associated with an initial SSB, and the initial SSB is an SSB selected by the terminal during the random access process that meets the access conditions;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO.

Optionally, the transmission resources of the PRACH include one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.

Optionally, the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

Wherein, the starting RO group of the PRACH transmission is the RO group associated with the initial SSB; the initial SSB is the SSB selected by the terminal during the random access process that meets the access conditions.

Optionally, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.

Optionally, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different.

An embodiment of the present disclosure also provides a method for receiving PRACH. The method includes:

The network device determines the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

The network device receives the PRACH on one SSB-associated RO group set or multiple SSB-associated RO group sets according to the mapping relationship; the RO group set includes at least one RO group.

Optionally, the method also includes:

The network device determines the number of ROs included in an RO group to be M based on the number M of PRACHs continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, and N is an RO association. The number of SSBs, N is greater than 0.

Optionally, the method also includes:

The network device determines the indexes of the M ROs in one RO group in the order of increasing the time domain resource index of the RO group in the first PRACH time slot and then increasing the PRACH time slot index.

Optionally, the method also includes:

The network device determines the number of ROs included in an RO group to be M*max(1,1/N) based on the number M of PRACHs continuously transmitted using time division multiplexing and the number N of SSBs associated with an RO;

Optionally, the method also includes:

The network device determines the M*max (1,1/N ) index of RO.

Optionally, the value of M is less than or equal to the value of K;

Optionally, the network device determines the mapping relationship between the SSB set and the RO group, including:

The network device maps each SSB in the SSB set to the RO group in a first order to obtain a mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is increased, then the frequency domain resource index is increased, then the time slot resource index of the RO group in a PRACH time slot is increased; and finally, the PRACH time slot index is increased in order.

Optionally, when an SSB-associated RO group set is used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/M times all SSBs in the SSB set Round robin mapping, where n is an integer greater than or equal to 1;

or,

When multiple SSB-associated RO group sets are used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, Where n is an integer greater than or equal to 1;

Optionally, M is the number of PRACHs that are continuously transmitted using time division multiplexing, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the number of PRACH transmissions. The number of all SSBs in the SSB set.

Optionally, the reception resources of the PRACH include one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

Optionally, the selected RO group set associated with multiple SSBs is: all the RO groups included in the SSB set A collection of RO groups associated with SSB;

An embodiment of the present disclosure also provides a terminal, including a memory, a transceiver, and a processor:

Memory, used to store computer programs; transceiver, used to send and receive data under the control of the processor; processor, used to read the computer program in the memory and perform the following operations:

Determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

According to the mapping relationship, select one SSB-associated RO group set or multiple SSB-associated RO group sets as the transmission resources of the PRACH; the RO group set includes at least one RO group;

According to the selected RO group set, multiple PRACH transmissions are performed.

Optionally, the processor is also configured to read the computer program in the memory and perform the following operations:

According to the number M of PRACHs that are continuously transmitted using time division multiplexing, the number of ROs included in an RO group is determined to be M; M is an integer greater than or equal to 1;

The time domain resource index of the RO group in the first PRACH time slot is incremented, and the subsequent PRACH time slot index is incremented. Determine the indexes of M ROs in a RO group in increasing order.

According to the number M of PRACHs that are continuously transmitted using time division multiplexing, and the number N of SSBs associated with an RO, the number of ROs included in a RO group is determined to be M*max(1,1/N);

According to the order of increasing the frequency domain resource index first, then increasing the time domain resource index of the RO group in the next PRACH slot, and finally increasing the PRACH slot index, determine the M*max (1,1/N) ROs in a RO group. index.

Optionally, the value of M is less than or equal to the value of K;

Each SSB in the SSB set is mapped to the RO group in the first order to obtain the mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is incremented, then the frequency domain resource index is incremented, then the RO group time slot resource index in a PRACH time slot is incremented; and finally the PRACH time slot index is incremented.

As an optional embodiment, when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Optionally, when an SSB-associated RO group set is used for PRACH transmission, A complete SSB to RO mapping cycle includes: n*K/M times of round-robin mapping of all SSBs in the SSB set, where n is an integer greater than or equal to 1;

or,

In the case of using multiple SSB associated RO group sets for PRACH transmission, a complete SSB to RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, Where n is an integer greater than or equal to 1;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO; M is the number of PRACHs that use time division multiplexing for continuous transmission.

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The maximum number of PRACH transmissions in a single random access process supported by the terminal or the PRACH corresponding to multiple PRACH transmission levels Number of transfers.

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different. An embodiment of the present disclosure also provides a PRACH transmission device, including:

The first determination unit is used to determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein one SSB set includes at least one SSB; one RO group includes at least one RO;

A selection unit configured to select one SSB-associated RO group set or multiple SSB-associated RO group sets as transmission resources of the PRACH according to the mapping relationship; the RO group set includes at least one RO group;

The transmission unit is used to perform multiple PRACH transmissions according to the selected RO group set.

Optionally, the device also includes:

The third determination unit is used to determine the number of ROs included in an RO group to be M based on the number M of PRACHs that are continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Optionally, the device also includes:

The fourth determination unit is used to determine the indexes of M ROs in a RO group in the order that the time domain resource index of the RO group in the first PRACH time slot increases first, and then the PRACH time slot index increases.

Optionally, the device also includes:

The fifth determination unit is used to determine the number of ROs included in an RO group to be M*max (1,1/N );

Optionally, the device also includes:

The sixth determination unit is used to determine M*max(1, 1/N) index of RO.

Optionally, the value of M is less than or equal to the value of K;

Among them, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.

Optionally, determine the mapping relationship between SSB sets and RO groups, including:

or,

In the case of using multiple SSB associated RO group sets for PRACH transmission, a complete SSB to RO mapping cycle includes: n*K/(M*s) times for all SSBs in the SSB set Round robin mapping, where n is an integer greater than or equal to 1;

The first valid RO in the RO group set associated with the initial SSB;

or,

An embodiment of the present disclosure also provides a network device, including a memory, a transceiver, and a processor:

According to the mapping relationship, PRACH is received on one SSB-associated RO group set or multiple SSB-associated RO group sets; the RO group set includes at least one RO group.

The indexes of M ROs in a RO group are determined in the order that the time domain resource index of the RO group in the first PRACH time slot increases first, and then the PRACH time slot index increases.

According to the number M of PRACHs continuously transmitted using time division multiplexing, and an RO association The number of SSBs is N, and the number of ROs included in a RO group is determined to be M*max(1,1/N);

Optionally, the value of M is less than or equal to the value of K;

Optionally, when an SSB-associated RO group set is used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/M times of round-robin mapping of all SSBs in the SSB set, where n is an integer greater than or equal to 1;

or,

The first valid RO in the RO group set associated with the initial SSB;

or,

Optionally, the preamble corresponding to multiple RO groups mapped to the same SSB in the RO group set The index range is the same;

An embodiment of the present disclosure also provides a PRACH receiving device, including:

The second determination unit is used to determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

A receiving unit configured to receive PRACH on one SSB-associated RO group set or multiple SSB-associated RO group sets according to the mapping relationship; the RO group set includes at least one RO group.

Optionally, the device also includes:

The seventh determination unit is used to determine the number of ROs included in an RO group to be M based on the number M of PRACHs that are continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Optionally, the device also includes:

The eighth determination unit is used to determine the indexes of M ROs in a RO group in the order that the time domain resource index of the RO group in the first PRACH time slot increases first, and then the PRACH time slot index increases.

Optionally, the device also includes:

The ninth determination unit is used to determine the number of ROs included in an RO group to be M*max (1,1/N );

Optionally, the device also includes:

The tenth determination unit is used to determine M*max(1, 1/N) index of RO.

Optionally, the value of M is less than or equal to the value of K;

Optionally, determining the mapping relationship between the SSB set and the RO group includes:

or,

Among them, M is the number of PRACHs that use time division multiplexing for continuous transmission, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the number of PRACH transmissions within the SSB set. The number of all SSBs.

The first valid RO in the RO group set associated with the initial SSB;

or,

Or, the preamble search corresponding to multiple RO groups associated with different SSBs in the RO group set The citing range is different.

Embodiments of the present disclosure also provide a processor-readable storage medium that stores a computer program, and the computer program is used to cause the processor to execute the method as described above.

The above technical solution of the present disclosure has at least the following beneficial effects:

In the PRACH transmission method, reception method, terminal and network device of the embodiment of the present disclosure, the RO group is used as the mapping unit of SSB. Then when the terminal selects RO group resources to transmit PRACH, it can select an SSB-associated RO group set, or, Select a set of RO groups associated with multiple SSBs to flexibly implement multiple PRACH transmissions.

Description of drawings

Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present disclosure are applicable;

Figure 2 shows a step flow chart of the PRACH transmission method provided by an embodiment of the present disclosure;

Figure 3 shows a step flow chart of a PRACH receiving method provided by an embodiment of the present disclosure;

Figure 4 shows one of the mapping schematic diagrams of SSB and RO groups in Example 1 provided by the embodiment of the present disclosure;

Figure 5 shows the second schematic diagram of the mapping between SSB and RO groups in Example 1 provided by the embodiment of the present disclosure;

Figure 6 shows the third schematic diagram of the mapping between SSB and RO groups in Example 1 provided by the embodiment of the present disclosure;

Figure 7 shows one of the mapping schematic diagrams of SSB and RO groups in Example 2 provided by the embodiment of the present disclosure;

Figure 8 shows the second schematic diagram of the mapping between SSB and RO groups in Example 2 provided by the embodiment of the present disclosure;

Figure 9 shows the third schematic diagram of the mapping between SSB and RO groups in Example 2 provided by the embodiment of the present disclosure;

Figure 10 shows the fourth schematic diagram of the mapping between SSB and RO groups in Example 2 provided by the embodiment of the present disclosure;

Figure 11 shows the fifth schematic diagram of the mapping between SSB and RO groups in Example 2 provided by the embodiment of the present disclosure;

Figure 12 shows one of the mapping schematic diagrams of SSB and RO groups in Example 3 provided by the embodiment of the present disclosure;

Figure 13 shows the second schematic diagram of the mapping between SSB and RO groups in Example 3 provided by the embodiment of the present disclosure;

Figure 14 shows the third schematic diagram of the mapping between SSB and RO groups in Example 3 provided by the embodiment of the present disclosure;

Figure 15 shows the fourth schematic diagram of the mapping between SSB and RO groups in Example 3 provided by the embodiment of the present disclosure;

Figure 16 shows the fifth schematic diagram of the mapping between SSB and RO groups in Example 3 provided by the embodiment of the present disclosure;

Figure 17 shows one of the mapping schematic diagrams of SSB and RO groups in Example 4 provided by the embodiment of the present disclosure;

Figure 18 shows the second schematic diagram of the mapping between SSB and RO groups in Example 4 provided by the embodiment of the present disclosure;

Figure 19 shows one of the mapping schematic diagrams of SSB and RO groups in Example 5 provided by the embodiment of the present disclosure;

Figure 20 shows the second schematic diagram of the mapping between SSB and RO groups in Example 5 provided by the embodiment of the present disclosure;

Figure 21 shows the third schematic diagram of the mapping between SSB and RO groups in Example 5 provided by the embodiment of the present disclosure;

Figure 22 shows the fourth schematic diagram of the mapping between SSB and RO groups in Example 5 provided by the embodiment of the present disclosure;

Figure 23 shows the fifth schematic diagram of the mapping between SSB and RO groups in Example 5 provided by the embodiment of the present disclosure;

Figure 24 shows the sixth schematic diagram of the mapping between SSB and RO groups in Example 5 provided by the embodiment of the present disclosure;

Figure 25 shows one of the mapping schematic diagrams of SSB and RO groups in Example 6 provided by the embodiment of the present disclosure;

Figure 26 shows the second schematic diagram of the mapping between SSB and RO groups in Example 6 provided by the embodiment of the present disclosure;

Figure 27 shows a schematic structural diagram of a terminal provided by an embodiment of the present disclosure;

Figure 28 shows a schematic structural diagram of a PRACH transmission device provided by an embodiment of the present disclosure;

Figure 29 shows a schematic structural diagram of a network device provided by an embodiment of the present disclosure;

Figure 30 shows a schematic structural diagram of a PRACH receiving device provided by an embodiment of the present disclosure.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present disclosure clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present disclosure are applicable. The wireless communication system includes a terminal device 11 and a network device 12. Among them, the terminal device 11 may also be called a terminal or a user terminal (User Equipment, UE). It should be noted that the embodiment of the present disclosure does not limit the specific type of terminal 11. The network device 12 may be a base station or a core network. It should be noted that in the embodiment of this disclosure, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

In the embodiment of the present disclosure, the term "and/or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. these three situations. The character "/" generally indicates that the related objects are in an "or" relationship.

In the embodiment of this disclosure, the term "plurality" refers to two or more than two, and other quantifiers are similar to it.

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments in this disclosure, those of ordinary skill in the art will not All other embodiments obtained without creative work fall within the scope of protection of this disclosure.

The technical solutions provided by the embodiments of the present disclosure can be applied to a variety of systems, especially fifth generation mobile communication technology (5th Generation, 5G) systems. For example, applicable systems can be global system of mobile communication (GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet Wireless service (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, Advanced long term evolution (long term evolution advanced, LTE-A) system, universal mobile telecommunication system (UMTS), global interoperability for microwave access (WiMAX) system, 5G New Radio, NR) system, etc. These various systems include terminal equipment and network equipment. The system can also include the core network part, such as the Evolved Packet System (EPS), 5G system (5GS), etc.

The terminal device involved in the embodiments of the present disclosure may be a device that provides voice and/or data connectivity to users, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem, etc. In different systems, the names of terminal equipment may also be different. For example, in a 5G system, the terminal equipment may be called User Equipment (UE). Wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via a Radio Access Network (RAN). The wireless terminal equipment can be a mobile terminal equipment, such as a mobile phone (also known as a "cellular phone"). "Telephone) and computers with mobile terminal devices, which may be, for example, portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile devices, which exchange speech and/or data with the radio access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants, PDA) and other equipment. Wireless terminal equipment may also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, or an access point. , remote terminal equipment (remote terminal), access terminal equipment (access terminal), user terminal equipment (user terminal), user agent (user Agent) and user device are not limited in the embodiments of this disclosure.

The network device involved in the embodiment of the present disclosure may be a base station, and the base station may include multiple cells that provide services for terminals. Depending on the specific application, a base station can also be called an access point, or it can be a device in the access network that communicates with wireless terminal equipment through one or more sectors on the air interface, or it can be named by another name. The network device may be used to interchange received air frames with Internet Protocol (IP) packets and act as a router between the wireless end device and the rest of the access network, which may optionally be Includes Internet Protocol (IP) communications networks. Network devices also coordinate attribute management of the air interface. For example, the network equipment involved in the embodiments of the present disclosure may be a network equipment (Base Transceiver Station, BTS) in the Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA). ), or it can be a network device (NodeB) in a Wide-band Code Division Multiple Access (WCDMA), or an evolutionary network device in a long term evolution (LTE) system (evolutional Node B, eNB or e-NodeB), 5G base station (gNB) in the 5G network architecture (next generation system), or home evolved base station (Home evolved Node B, HeNB), relay node (relay node) , home base station (femto), pico base station (pico), etc., are not limited in the embodiments of the present disclosure. In some network structures, network equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes. The centralized unit and distributed unit may also be arranged geographically separately.

Network equipment and terminal equipment can each use one or more antennas for multi-input multi-output (MIMO) transmission. MIMO transmission can be single-user MIMO (Single User MIMO, SU-MIMO) or multi-user MIMO. (Multiple User MIMO,MU-MIMO). Depending on the shape and number of root antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can be diversity transmission, precoding transmission or beamforming transmission, etc.

As shown in Figure 2, an embodiment of the present disclosure provides a transmission method for the physical random access channel PRACH. The method includes:

Step 201: The terminal determines the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; - Each RO group includes at least one RO;

Step 202: The terminal selects one SSB-associated RO group set or multiple SSB-associated RO group sets as transmission resources of PRACH according to the mapping relationship; the RO group set includes at least one RO group;

Step 203: The terminal performs multiple PRACH transmissions according to the selected RO group set.

In the embodiment of this disclosure, an RO group is defined. An RO group contains at least one RO. The RO group is used as the mapping unit of the SSB. One SSB maps multiple RO groups at a time, or one SSB maps to one RO group at a time.

Optionally, RACH-related configuration information is carried in System Information Block 1 (SIB1), and SIB1 is sent to the UE through broadcast. The UE can learn the RACH configuration information by receiving SIB1, determine the appropriate RO based on the RACH configuration information, and send PRACH in the RO to initiate random access.

Specifically, the method for the base station to configure/instruct RO time-frequency resources through SIB1 is roughly as follows:

(1) Use prach-ConfigurationIndex to indicate the format of PRACH, the system frame number, the subframe number in a system frame, the number of PRACH slots in a subframe, the number of time domain ROs in a PRACH slot, etc.;

(2) Use msg1-FrequencyStart and msg1-FDM to indicate the starting position of the RO in the frequency domain and the number of frequency-divided ROs;

(3) Indicate the association between SSB and RO through ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

Among them, the content indicated by the ssb-perRACH-OccasionAndCB-PreamblesPerSSB parameter contains two parts. The first is the number N of SSBs associated with each RO, and the second is the number R of preambles included in each SSB.

As an optional embodiment, only multiple transmission opportunities in the time domain are considered when determining the RO group. When N is greater than or equal to 1, one SSB is mapped to one RO group at a time. When N is less than 1, one SSB is mapped to multiple RO groups at a time. ; That is, the method also includes:

Optionally, the M may be predefined, or may be configured by high-layer parameters, or may be calculated based on configuration parameters of other multi-PRACH transmissions.

In this embodiment, the method further includes:

As another optional embodiment, when determining the RO group, first consider that the SSB is associated with N ROs in the frequency domain, and then consider multiple transmission opportunities in the time domain, then one SSB is mapped to one RO group at a time; that is, the method also includes:

In this embodiment, the method further includes:

In at least one embodiment of the present disclosure, the value of M is less than or equal to the value of K;

It should be noted that the smaller M is, the fewer opportunities there are to continuously send PRACH, and the longer the delay is for the UE to send multiple PRACHs in a random access process. M may be predefined, configured by higher layer parameters, or calculated based on other PRACH transmission configuration parameters. For example, if the UE instructs to divide K transmissions into The method of determining M is not limited in this example.

That is, in the embodiment of the present disclosure, by setting different values of M, continuous transmission of multiple PRACHs, partially continuous transmission of multiple PRACHs, or discrete transmission of multiple PRACHs can be achieved.

It should be noted that if K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels. In a possible implementation, the transmission level may be determined by the RSRP threshold level, and different transmission levels correspond to different preamble index ranges. For example, the high-level parameter configuration PRACH transmission number 1 corresponds to preamble index 0 to preamble index 3; PRACH transmission number 2 corresponds to preamble index 4 to preamble index 7; PRACH transmission number 4 corresponds to preamble index 8 to preamble index 11. The UE can select the corresponding number of PRACH transmissions based on different RSRP thresholds, and then arbitrarily select a preamble within the preamble index range corresponding to the number of PRACH transmissions; the UE divides the mapping pattern (pattern) from SSB to RO group according to the current number of PRACH transmissions. In this case, although the RSRP threshold is configured on the network side, the network side does not know the RSRP measurement results of the UE, and therefore does not know the number of PRACH transmissions used by the UE to divide and map the pattern. At this time, the base station needs to combine the three types of transmissions. The pattern corresponding to the number of candidate values is tried once. Under each pattern, the RO group set for the UE to transmit PRACH is determined, and the PRACH sent by the UE is attempted to be received on these RO group resources. Among them, the mapping pattern that can correctly receive PRACH transmission is the mapping pattern selected by the UE.

In at least one embodiment of the present disclosure, step 201 includes:

Wherein, each SSB is mapped to the RO group in the first order, which can be understood as: each SSB is mapped to the effective RO group in the first order, and the ROs in the effective RO group are all effective ROs. The effective RO is defined as follows:

For frequency division duplexing (FDD) or supplementary uplink band (SUL), all ROs are valid ROs.

For Time Division Duplexing (TDD):

When the UE is the initial access and has not established a Radio Resource Control (RRC) connection to receive the high-level configuration parameter tdd-UL-DL-ConfigurationCommon, if there is an SSB in the PRACH slot, the start of an RO The symbol is at least N _gap symbols after the end symbol of the SSB, and the RO is a valid RO.

When the UE has established an RRC connection and received the high-level configuration parameter tdd-UL-DL-ConfigurationCommon, if the RO in the PRACH slot is received in the uplink symbol, or the start of an RO in the PRACH slot The RO is a valid RO if the symbol is N _gap symbols after the last downlink symbol and at least N _gap symbols after the end symbol of SSB. The N _gap is the measurement interval configured by the network. The N _gaps under different subcarrier spacing configurations can be the same or different.

Optionally, the SSB set includes: all SSBs on the network side, or some SSBs on the network side. Optionally, the SSB set is an SSB set configured with high-layer parameters. The SSB set may be a set of all SSBs on the network side, or the SSB set may be a subset of all SSB sets on the network side.

Optionally, the number of candidate SSB indexes included in the SSB sets corresponding to different initial SSBs may be the same or different, and is not specifically limited here.

As an optional embodiment, when an SSB-associated RO group set is used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/M rounds of all SSBs in the SSB set. Mapping, where n is an integer greater than or equal to 1; this scenario can also be understood as the UE using the same beam information for PRACH transmission.

Wherein, M is the number of PRACHs that are continuously transmitted using time division multiplexing, and K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.

As another optional embodiment, in the case of using multiple SSB associated RO group sets for PRACH transmission, a complete SSB to RO mapping cycle includes: n*K/(M*s) times of the SSB set Round-robin mapping of all SSBs within the UE, where n is an integer greater than or equal to 1; this scenario can also be understood as the UE using different beam information for PRACH transmission.

In an optional embodiment of the present disclosure, when the number of frequency domain ROs occupied by all SSBs included in the SSB set in polling mapping is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain are no longer Used for the next SSB round robin mapping.

In another optional embodiment of the present disclosure, when all SSBs included in the SSB set are not mapped to an integer number of RO groups in one round robin, the remaining preamble in the last RO group is no longer used for the next SSB. Polling mapping.

Optionally, in this embodiment of the present disclosure, multiple PRACHs can be transmitted using the same preamble or different preambles, which are not specifically limited here.

As an optional embodiment, the RO group set associated with an SSB selected in step 202 is: the RO group set associated with the initial SSB, and the initial SSB is an SSB selected by the terminal during the random access process that meets the access conditions. ;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO, and M is the number of PRACHs that use time division multiplexing for continuous transmission.

The first valid RO in the RO group set associated with the initial SSB;

or,

As an optional embodiment, the set of RO groups associated with multiple SSBs selected in step 202 is: the set of RO groups associated with all SSBs included in the SSB set;

In an optional embodiment of the present disclosure, multiple identical SSB mappings within the RO group set The preamble index ranges corresponding to the RO groups are the same; or, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.

In another optional embodiment of the present disclosure, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

In the embodiment of the present disclosure, the RO group is used as the mapping unit of SSB. When the terminal selects the RO group resource to transmit PRACH, it can select an SSB-associated RO group set, or select multiple SSB-associated RO group sets, thereby realizing the terminal's The function of transmitting multiple PRACHs on the same beam (beam) or different beams; in addition, by flexibly configuring the number M of PRACHs for continuous transmission through time division multiplexing, it is possible to flexibly choose to continuously transmit multiple PRACHs, partially continuously transmit multiple PRACHs, or discretely transmit multiple PRACHs. .

As shown in Figure 3, an embodiment of the present disclosure also provides a method for receiving PRACH. The method includes:

Step 301: The network device determines the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

Step 302: The network device receives PRACH on one SSB-associated RO group set or multiple SSB-associated RO group sets according to the mapping relationship; the RO group set includes at least one RO group.

In this embodiment, the method further includes:

The network device determines the M*max (1,1/N ) index of RO.

That is, in the embodiment of the present disclosure, by setting different values of M, it is possible to realize continuous transmission of multiple PRACHs. Or partially continuously transmit multiple PRACHs or discretely transmit multiple PRACHs.

It should be noted that if K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels. In a possible implementation, the transmission level may be determined by the RSRP threshold level, and different transmission levels correspond to different preamble index ranges. For example, the high-level parameter configuration PRACH transmission number 1 corresponds to preamble index 0 to preamble index 3; PRACH transmission number 2 corresponds to preamble index 4 to preamble index 7; PRACH transmission number 4 corresponds to preamble index 8 to preamble index 11. The UE can select the corresponding number of PRACH transmissions based on different RSRP thresholds, and then select a preamble arbitrarily within the preamble index range corresponding to the number of PRACH transmissions; the UE divides the mapping pattern from SSB to RO groups according to the current number of PRACH transmissions. In this case, although the RSRP threshold is configured on the network side, the network side does not know the RSRP measurement results of the UE, and therefore does not know the number of PRACH transmissions used by the UE to divide and map the pattern. At this time, the base station needs to combine the three types of transmissions. The pattern corresponding to the number of candidate values is tried once. Under each pattern, the RO group set for the UE to transmit PRACH is determined, and the PRACH sent by the UE is attempted to be received on these RO group resources. Among them, the mapping pattern that can correctly receive PRACH transmission is the mapping pattern selected by the UE.

In at least one embodiment of the present disclosure, step 301 includes:

For Time Division Duplexing (TDD):

The UE has established an RRC connection and received high-level configuration parameters. In the case of tdd-UL-DL-ConfigurationCommon, if the RO in the PRACH slot is received in the uplink symbol, or the starting symbol of an RO in the PRACH slot is N _gap symbols after the last downlink symbol and is in the SSB At least N _gap symbols after the end symbol, the RO is a valid RO. Optionally, N _gap is the measurement interval configured by the network. The N _gap under different subcarrier spacing configurations can be the same or different.

As an optional example,

When an SSB-associated RO group set is used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/M times of round-robin mapping of all SSBs in the SSB set, where n is greater than or An integer equal to 1; this scenario can also be understood as the UE using the same beam information for PRACH transmission.

As another optional embodiment, when multiple SSB-associated RO group sets are used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) times of the SSB set Round-robin mapping of all SSBs within the UE, where n is an integer greater than or equal to 1; this scenario can also be understood as the UE using different beam information for PRACH transmission.

In an optional embodiment of the present disclosure, all SSBs included in the SSB set rotate one If the number of frequency-domain ROs occupied by secondary mapping is less than the number of frequency-division ROs configured in the network, the remaining RO groups in the frequency domain will no longer be used for the next SSB round-robin mapping.

As an optional embodiment, the RO group set associated with an SSB selected in step 302 is: the RO group set associated with the initial SSB, and the initial SSB is an SSB selected by the terminal during the random access process that meets the access conditions. ;

The first valid RO in the RO group set associated with the initial SSB;

or,

As an optional embodiment, the set of RO groups associated with multiple SSBs selected in step 302 is: the set of RO groups associated with all SSBs included in the SSB set;

In an optional embodiment of the present disclosure, the preamble index ranges corresponding to multiple RO groups with the same SSB mapping in the RO group set are the same; or, the same SSB mapping in the RO group set The preamble index ranges corresponding to multiple RO groups are different.

In the embodiment of the present disclosure, the RO group is used as the mapping unit of SSB. When the subsequent network device selects the RO group resource to transmit PRACH, it can select an SSB-associated RO group set, or select multiple SSB-associated RO group sets, thereby realizing the terminal The function of transmitting multiple PRACHs on the same beam (beam) or different beams; in addition, by flexibly configuring the number M of PRACHs for continuous transmission through time division multiplexing, it is possible to flexibly choose to continuously transmit multiple PRACHs or partially continuously transmit multiple PRACHs or discretely transmit multiple PRACHs. PRACH.

In order to more clearly describe the PRACH transmission method and reception method provided by the embodiments of the present disclosure, several embodiments will be described below.

Example 1

This example describes how all SSBs are mapped to effective RO groups when the number of ROs contained in a RO group unit is M. The situation considered in this embodiment is as follows: msg1-FDM configured by the high layer is 1, that is, there is no frequency domain FDM; at the same time, the number N of SSBs associated with an RO configured by the high layer is 1, that is, SSB and RO are mapped one-to-one. In addition, in this example, if multiple PRACHs use the same beam for transmission, that is, the RO group associated with the same SSB index is selected for PRACH transmission.

In this example, the M ROs contained in an RO group always occupy the same frequency domain position in a TDM arrangement. The indexes of the M ROs are arranged in the order that the RO time domain resource index in the PRACH time slot increases first, and then the PRACH time slot index increases. The UE can continuously send M PRACHs within an RO group. Considering that there is no FDM and no many-to-one mapping in this example, the arrangement order between RO groups only needs to be determined according to the rule that the RO time domain resource index in the PRACH time slot increases first, and the PRACH time slot index increases later.

When M=1, there is only one RO in a RO group. According to the SSB index, each SSB is associated with one RO. Assume that the UE supports the transmission of K = 4 PRACHs at most in a random access process. Considering that PRACH transmission uses the same beam, at this time, a complete SSB-to-RO association cycle includes at least 4 (K/M = 4/1 ) times of round-robin mapping of all SSBs to find the one associated with the same SSB Indexed four RO groups. Figure 4 shows the mapping pattern of two SSBs. One of the dotted boxes is an RO group. If the SSB that the UE selects to meet the access conditions is SSB1, and the UE needs to perform 4 times in a single channel access process, then PRACH will select the RO group set RO0, RO0, and RO associated with SSB1 in the current SSB-to-RO association period. Four transmissions are performed on RO2, RO4, and RO6.

In the same way, M can be other positive integers, such as M=2. At this time, there are two TDM ROs in one RO group, that is, two PRACH transmission opportunities. Therefore, a complete SSB-to-RO association cycle includes at least 2 (K/M=4/2) round-robin mappings of all SSBs, as shown in Figure 5, in which a dotted box is an RO group. In this case, PRACH will select SSB1 to perform 4 transmissions on the RO group set RO0, RO1, RO4, and RO5 associated within the current SSB-to-RO association period.

Or M can also be equal to K. At this time, one RO group contains K TDM ROs, and a complete SSB-to-RO cycle can only include at least one SSB round-robin. As shown in Figure 6, one of the dotted boxes is an RO group. In this case, PRACH will select SSB1 to perform 4 transmissions on the RO group set RO0, RO1, RO2, and RO3 associated within the current SSB-to-RO association period.

In general, the smaller M is, the fewer opportunities there are to continuously send PRACH, and the longer the delay is for the UE to send multiple PRACHs in a random access process. M may be predefined, configured by higher layer parameters, or calculated based on other PRACH transmission configuration parameters. For example, if the UE instructs to divide K transmissions into The method of determining M is not limited in this example.

The base station side divides the mapping pattern from SSB to RO through the same rules, determines the set of RO groups in which the UE transmits PRACH, and receives the PRACH sent by the UE on these RO group resources.

Example 2

Based on Example 1, this embodiment further introduces that the msg1-FDM configured by the high layer is greater than 1, that is, frequency domain FDM is configured; at the same time, the number N of SSBs associated with an RO configured by the high layer is less than 1, that is, one-to-many SSB and RO mapping.

The order of RO indexes within a RO group is the same as Example 1. Regarding the mapping order between RO groups, considering that in this embodiment only FDM does not have many-to-one mapping, the mapping between RO groups needs to increase according to the frequency domain resource index, then the RO time domain resource index in the PRACH slot increases, and finally the PRACH The rules for incrementing the slot index are determined.

Assume that msg1-FDM is 4; the number N of SSBs associated with an RO is 1/2, that is, one SSB is mapped to two ROs; the UE supports the transmission of up to K=4 PRACHs in a random access process. Figure 7 shows the mapping pattern of two SSBs configured by the upper layer when M=1. A dotted box represents an RO group, and two consecutive dotted boxes in the frequency domain represent two RO groups corresponding to the same SSB. Specifically, the first mapping of SSB1 will be mapped to two RO groups. The first RO group contains RO0, and the second RO group contains RO1. In the end, the UE will randomly select one RO group from these two RO groups to transmit PRACH. ;The first mapping of SSB2 will be mapped to two RO groups, the first RO group contains RO2, and the second RO group contains RO3. The UE randomly selects one RO group from these two RO groups to transmit PRACH. By analogy, until a complete SSB-to-RO association cycle includes at least 4 (K/M=4/1) round-robin mappings of all SSBs.

Similarly, Figure 8 shows the mapping pattern in which the upper layer configures 2 SSBs when M=2. Specifically, the first mapping of SSB1 will be mapped to two RO groups. The first RO group contains RO0 and RO1, and the second RO group contains RO2 and RO3. In the end, the UE will randomly select one of the two RO groups. RO group transmits PR ACH. And so on.

Figure 9 shows that the upper layer configures a mapping pattern with 2 SSBs when M=K. Specifically, the first mapping of SSB1 will be mapped to two RO groups. The first RO group contains RO0 ~ and RO3, and the second RO group contains RO4 ~ RO7. In the end, the UE will randomly select from these two RO groups. An RO group transmits PRACH. And so on.

Furthermore, if msg1-FDM is 8 and the number N of SSBs associated with an RO is 1/2, the UE supports up to K=4 PRACH transmissions during a random access process, and the upper layer configures 3 SSBs. As shown in Figure 10, 3 SSB round robin occupies 6 frequency domain RO groups at a time, which is smaller than the msg1-FDM configured by the base station. According to the round robin mapping rule of first frequency domain and then time domain, the two boxes framed in Figure 10 are originally The RO group location should be used for the second mapping of SSB1. At this time, when PRACH is transmitted using the same beam, that is, all RO groups corresponding to SSB1, the UE will FDM transmit two PRACHs at the same time domain position. Generally speaking, UE does not have the capability of FDM transmission of PRACH, and even if it supports it, it will affect the transmission power. Therefore, in order to avoid this situation, when the frequency domain RO array occupied by all SSB round-robin mapping is smaller than the msg1-FDM configured by the base station, the remaining RO groups in the frequency domain cannot be used for the next SSB round-robin mapping.

Optionally, there is another solution. When SSB rotates to the RO group, the frequency is still full. All ROs in the domain, but when PRACH transmission selects RO group resources, it is necessary to ensure that the RO groups associated with the same SSB are in different time domain locations. As shown in Figure 11, RO6 and RO7 are the two RO groups corresponding to SSB1. However, when selecting the RO group for PRACH transmission, there are already RO0 and RO1 corresponding to SSB1 at this time domain position. Therefore, when selecting the RO group associated with SSB1 RO6 and RO7 should be skipped during grouping to avoid FDM transmission of the same PRACH. Therefore, the second PRACH transmission of SSB1 should be in RO12 and RO13. And so on.

It should be noted that in Example 1 and Example 2, whether it is one-to-one mapping or one-to-many mapping, the index of the preamble in each RO starts from 0. In the end, all SSB indexes in the RO group set are the same or different. The preamble index range associated with the SSB index is the same.

Example 3

Based on Example 1, this example further introduces that the msg1-FDM configured by the high-level is greater than 1, that is, frequency domain FDM is configured; at the same time, the number N of SSBs associated with a RO configured by the high-level is greater than 1, that is, many-to-one mapping between SSBs and ROs. .

The order of RO indexes within a RO group is the same as Example 1. Regarding the mapping sequence between RO groups, considering that there is both FDM and multi-to-one mapping in this example, the mapping between RO groups needs to increase from the preamble index in an RO group to the frequency domain resource index, and then to another The RO group time domain resource index in the PRACH timeslot is increased, and finally the rules for the PRACH timeslot index increment are determined.

Assume that msg1-FDM is 2; the number N of SSBs associated with an RO is 2, that is, two SSBs are mapped to the same RO; the UE supports the transmission of up to K=4 PRACHs in a random access process. In this example, only the mapping pattern with 2 SSBs configured by the upper layer when M=1 is taken as an example. As shown in Figure 12, SSB1 and SSB2 are mapped to the same RO and sorted by preamble index. The starting preamble index of SSB1 determined according to the relevant technology is 0, and the starting preamble index of SSB2 is In this example, there is also the problem of remaining RO in the frequency domain due to two SSBs occupying one frequency domain RO group at a time, which is smaller than the msg1-FDM configured by the base station. At this time, some frequency domain locations cannot be used to map RO groups. Of course, in this case, a more reasonable way is for the base station to configure msg1-FDM as 1 to avoid wasting frequency domain resources. Similarly, the method in Example 2 can also be used. There are no additional restrictions on the mapping of SSB to RO groups, but the set of RO groups associated with SSB selected in PRACH transmission is the RO group that skips FDM. As shown in Figure 13, RO1, RO3, RO5, and RO7 will be skipped when selecting the RO group associated with SSB.

In addition, another situation may occur when N>1. As shown in Figure 14, assume that the msg1-FDM configured in the base station is 1 and the upper layer is configured with 3 SSBs. If the mapping rules in related technologies are followed, the next SSB1 mapping should be performed after mapping SSB3. In this case, the starting preamble index of SSB3 in RO1 is 0, and the starting preamble index of SSB1 is This will lead to different preambles corresponding to multiple PRACHs sent using the same beam during a random access process. At this time, the base station may not be able to identify that different preambles correspond to the same UE. In order to avoid this problem, if all SSB rounds are not mapped to an integer number of RO groups at one time, the remaining preamble in the last RO group cannot be used for the next SSB round robin mapping.

Of course, this restriction is optional. As shown in Figure 15, the mapping from SSB to RO groups is continuous, but when the UE selects the RO group for PRACH transmission, the preamble index ranges corresponding to multiple RO groups associated with the same SSB in the RO group are the same. Assume that the SSB selected by the UE that meets the access conditions is SSB1. SSB1's starting preamble index in the associated RO0 is 0, and SSB1's starting preamble index in the associated RO1 is At this time, RO1 cannot become an RO group set candidate for PRACH transmission. The starting preamble index of SSB1 in the associated RO3 is 0. By analogy, the set of RO groups selected for PRACH transmission are RO0, RO3, RO6 and RO9 associated with SSB1.

On the other hand, if the UE can support different RO groups associated with the same SSB in the RO group set, they can use different preambles to transmit PRACH. As long as the network side has a mechanism to distinguish which preambles correspond to the same UE, this restriction is not required. As shown in Figure 16, assume that the SSB selected by the UE that meets the access conditions is SSB1, and the set of RO groups selected for PRACH transmission are RO0, RO1, RO3 and RO4 associated with SSB1. Optionally, the starting preamble index corresponding to SSB1 in RO0 and RO3 is 0, and the starting preamble index corresponding to SSB1 in RO1 and RO4 is

In Figures 12 to 16, the preamble index ranges corresponding to SSB1 and SSB2 are always different. The preamble index ranges corresponding to SSB1 and SSB3 are the same in some cases and different in some cases. If you want to ensure that the preamble ranges corresponding to different SSB indexes in the RO group set are the same, when N>1, you can further select RO groups that meet the requirements according to the above rules, such as selecting the part with the same preamble range in the mapping pattern in Figure 16. Or, when determining the mapping pattern, all SSBs are mapped to the same position in the corresponding preamble index range, and other preamble indexes in the RO are not mapped to SSBs. But obviously, when the preamble range corresponding to different SSB indexes is required to be the same, N>1 is not an optimal configuration, and N≤1 should be preferred.

Example 4

This example describes how all SSBs are mapped to effective RO groups when the number of ROs contained in a RO group unit is M*max(1,1/N). When the number of SSB units associated with an RO configured by the higher layer is N ≥ 1, the number of ROs included in an RO group is M. At this time, all SSB-to-RO mapping rules are the same as Example 1 to Example 3, and the UE selects The RO group associated with SSB transmits multiple PRACHs in the same way. This example mainly considers the situation where the number N of SSBs associated with an RO configured by the high-level is less than 1, that is, one-to-many mapping between SSBs and ROs. This example still selects when there are multiple PRACH transmissions Same beam transmission is used, that is, PRACH transmission selects the RO group associated with the same SSB index.

First consider the situation where msg1-FDM configured in the high layer is 1, that is, there is no frequency domain FDM. Assume N=1/2, M=2. At this time, an RO group contains 4 ROs. Considering that there is no FDM at this time, the indexes of the 4 ROs in the RO group are incremented according to the RO time domain resource index in the previous PRACH slot. The subsequent PRACH slots are arranged in increasing order of index. The mapping sequence between RO groups is the same as in Example 1 to Example 3. A complete SSB-to-RO association cycle includes at least 2 (K/M=4/2) rounds of round-robin mapping of all SSBs. On the other hand, unlike Examples 1 to 3 in which one RO group only includes M ROs corresponding to M PRACH transmission opportunities, this example first arranges 1/N ROs corresponding to one PRACH transmission opportunity in sequence, and then Arrange M times of PRACH transmission opportunities, and finally determine the index of M/N ROs in an RO group. As shown in Figure 17, the RO group mapped by SSB1 for the first time contains a total of 4 ROs, RO0 to RO3. Among them, if the SSB that the UE selects that meets the access conditions is SSB1, the UE will select any RO among RO0 and RO1 to transmit the first PRACH, and select any RO among RO2 and RO3 to transmit the second PRACH. In the same way, the RO group mapped by SSB2 for the first time contains a total of 4 ROs, RO4 to RO7. Among them, if the SSB that the UE selects that meets the access conditions is SSB2, the UE will select any RO among RO4 and RO5 to transmit the first PRACH, and select any RO among RO6 and RO7 to transmit the second PRACH. And so on.

Secondly, consider that the msg1-FDM configured by the high layer is greater than 1, that is, there is frequency domain FDM. Assume msg1-FDM=2, N=1/2, M=2. At this time, a RO group contains 4 ROs. Considering that FDM exists at this time, the index of the 4 ROs in the RO group increases according to the frequency domain resource index. , the RO group time domain resource index in the next PRACH slot increases, and the last PRACH slot index increases in order. The mapping sequence between RO groups is the same as Example 1 to Example 3, as shown in Figure 18. The RO group mapped for the first time by SSB1 contains a total of 4 ROs, RO0 to RO3. , if the SSB that the UE selects that meets the access conditions is SSB1, the UE will select any RO among RO0 and RO1 to transmit the first PRACH, and select any RO among RO2 and RO3 to transmit the second PRACH. And so on. Compared with an RO group containing M ROs, the advantage of this embodiment is that different frequency domain positions can be selected between multiple PRACHs. For example, the first PRACH is transmitted in RO1, and the second PRACH is transmitted in RO2. . As shown in Figure 8, if an RO group contains M ROs, the time domain TDM transmission opportunities are prioritized during SSB mapping. The UE can only select two ROs in an RO group at the same frequency domain location for two PRACH transmission.

The way to determine the RO group in this example will also include the remaining RO groups in the frequency domain being unavailable in Example 2 and Example 3, the selected RO groups being discontinuous or the remaining preamble in the RO group being unavailable, and multiple RO groups associated with the same/different SSBs. Corresponding to the case of the same/different preamble, this example will not be carried out in detail. It should be noted that the reason for the remaining RO groups in the frequency domain focuses on the number of frequency domain ROs occupied by all SSBs in one round. In the example, one RO group occupies 2*(1/N) frequency domain ROs.

Example 5

In Examples 1 to 4, the maximum number of PRACHs that the UE supports to send in a random access process is K, and the number of PRACHs that the UE actually sends when it selects the RO group associated with the SSB to transmit PRACH is also K. However, if, within a complete SSB-to-RO association period, when the number numK of PRACHs actually sent by the UE during the random access process is less than the maximum number of PRACHs K supported by the UE, the UE will select the initial number that meets the access conditions. The RO group associated with the SSB can have more than one starting position when sending PRACH.

Specifically, this example assumes that the number numK of PRACHs that the UE actually needs to send in the random process is 2 times. If there is only one starting position, then the UE is fixed to start at the first RO in the RO group set associated with the initial SSB. As shown in Figure 19, Figure 20 and Figure 21, if the initial SSB selected by the UE is SSB1, no matter what M is, the UE will start from RO0 and select the two ROs associated with SSB1 according to the mapping pattern to transmit PRACH. If the initial SSB selected by the UE is SSB2, as shown in Figure 19, when M=1, the UE starts from RO1 and selects the two ROs associated with SSB2 according to the mapping pattern to transmit PRACH; as shown in Figure 20, when M=2, The first RO in the RO group set associated with SSB2 is RO2; as shown in Figure 21, when M=K, the first RO in the RO group set associated with SSB2 is RO4.

Alternatively, PRACH has multiple starting positions. At this time, PRACH can have K/numK, which is two starting positions. Starting from the 1st RO and 3rd RO in the RO group set associated with the initial SSB respectively. Figure 22, Figure 23 and Figure 24 reflect the difference between the two starting positions. When the UE selects the RO group set associated with SSB1 to transmit PRACH, it starts transmitting from the first RO. If the UE selects the RO group set associated with SSB2 to transmit PRACH, it starts from the first RO. The 3rd RO starts transmission.

This example only takes the simplest case where the high-level configuration N=1 and no FDM is configured as an example, and other configurations can be deduced in this way. The main benefit of dividing multiple starting points is to consider that different UEs can transmit PRACH from different starting points to improve resource utilization. If it is fixed to start transmission from the first RO PRACH, if the number of times the UE actually transmits PRACH is small, the subsequent ROs in a complete SSB-to-RO mapping period are wasted.

It should be noted that in this example, if the number of PRACHs actually transmitted numK is equal to the maximum number of PRACHs supported by the UE, both fixing a starting position and calculating the actual position according to the formula are applicable, but the starting position determined by the two methods is The same means that PRACH is sent from the first RO in the RO group set associated with the initial SSB.

Example 6

Furthermore, on the basis of Examples 1 to 4, if the UE uses different beams to send multiple PRACHs during a random access process, that is, RO groups associated with different SSB indexes can be selected for PRACH transmission. At this time, a complete SSB-to-RO association cycle does not need to include at least K/M round-robin mappings of all SSBs. It only needs to ensure that there are at least K/M SSB mappings in a complete association cycle, where, K/M SSBs are rotated according to the SSB index.

Specifically, as shown in Figure 25 and Figure 26, when the UE needs to transmit PRACH 4 times during a random access process, and the SSB that the UE selects to meet the access conditions is SSB1, then SSB1 is the initial SSB, and the association is from the initial SSB The RO group starts to select the RO group that satisfies the number of PRACH transmissions according to the SSB index (SSB1, SSB2). In this example, the UE will select RO0~RO3. When M=1, the UE sends four PRACHs in turn on two beams; when M>1, the UE sends two PRACHs and then changes to a beam and sends two more PRACHs. Similarly, if the SSB selected by the UE that meets the access conditions is SSB2, then SSB1 is the initial SSB. Starting from the RO group associated with the initial SSB, the RO group that meets the number of PRACH transmissions is selected in sequence according to the SSB index (SSB2, SSB1).

In this example, there are also situations where the remaining RO groups in the frequency domain are unavailable in Example 2 and Example 3, the selected RO groups are discontinuous, or the remaining preambles in the RO groups are unavailable, and multiple RO groups associated with the same/different SSBs correspond to the same/different preambles. , this example will not be carried out in detail. It only needs to be ensured that in a complete SSB-to-RO mapping cycle, multiple RO groups associated with the same SSB are at different frequency domain positions, or the same preamble index range for the same SSB in different RO groups is the same.

In this example, it can be considered that the set of all SSBs configured by the high layer is SSB1 and SSB2. At this time, the round-robin mapping from SSB to RO is two SSBs. In addition, in this embodiment, the following situation may also exist: all SSB sets configured by the high layer are SSB1, SSB2 and SSB3. The upper layer configures a Corresponding SSB sets, each set can be a complete set or a subset of all SSB sets. The SSB indexes contained in different SSB sets can overlap, and the number of SSBs contained can be the same or different. For example, the SSB set configured by the high layer for SSB1 is {SSB1, SSB2}, the SSB set configured for SSB2 is {SSB2, SSB3}, and the SSB set configured for SSB3 is {SSB3, SSB1, SSB2}. Of course, the SSB indexes in the SSB set can be out of order. For example, the SSB set configured by the high layer for SSB2 is {SSB2, SSB1, SSB3}. If the SSB set configured by the high layer is a subset of all SSB indexes, then only all SSB indexes included in the SSB subset need to be mapped during SSB round-robin mapping. The index round-robin method is the same as in all embodiments.

To sum up, in the embodiment of the present disclosure, the RO group is used as the mapping unit of SSB. When the terminal selects the RO group resource to transmit PRACH, it can select an SSB-associated RO group set, or select multiple SSB-associated RO group sets, so that Achieve flexible selection of continuous transmission of PRACH or partial continuous transmission of multiple PRACHs or discrete transmission of multiple PRACHs; in addition, different rules are used to determine the RO group set of multiple PRACH transmission candidates, enabling the terminal to send multiple PRACHs on the same beam (beam) or different beams function.

As shown in Figure 27, this embodiment of the present disclosure also provides a terminal, including a memory 420, a transceiver 410, and a processor 400:

Memory 420, used to store computer programs; transceiver 410, used to send and receive data under the control of the processor; processor 400, used to read the computer program in the memory and perform the following operations:

As an optional embodiment, the processor 400 is also configured to read the computer program in the memory and perform the following operations:

As an optional embodiment, the value of M is less than or equal to the value of K;

As an optional embodiment, the SSB set includes: all SSBs on the network side, or some SSBs on the network side.

As an optional embodiment, when an SSB-associated RO group set is used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/M rounds of all SSBs in the SSB set. Mapping, where n is an integer greater than or equal to 1;

or,

As an optional embodiment, when the number of frequency domain ROs occupied by all SSBs included in the SSB set for round-robin mapping is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain will no longer be used for the next time. SSB round robin mapping.

As an optional embodiment, when all the SSBs included in the SSB set are not mapped to an integer number of RO groups in one round robin, the remaining preamble in the last RO group is no longer used for the next SSB round robin mapping.

As an optional embodiment, the selected RO group set associated with an SSB is: the RO group set associated with the initial SSB, and the initial SSB is an SSB selected by the terminal during the random access process that meets the access conditions;

As an optional embodiment, the PRACH transmission resource includes one or more start bits Position; wherein, the starting position is:

The first valid RO in the RO group set associated with the initial SSB;

or,

As an optional embodiment, the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

As an optional embodiment, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

As an optional embodiment, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

Optionally, in FIG. 27 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 400 and various circuits of the memory represented by memory 420 linked together. The bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are all well known in the art and therefore will not be described further herein. The bus interface provides the interface. Transceiver 410 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, etc. Transmission medium. For different user equipment, the user interface 430 can also be an interface that can connect external and internal devices as needed. The connected devices include but are not limited to keypads, monitors, speakers, microphones, and joysticks. wait.

The processor 400 is responsible for managing the bus architecture and general processing, and the memory z20 can store data used by the processor 400 when performing operations.

Optionally, the processor 400 can be a central processing unit (Central Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable Logic device (Complex Programmable Logic Device, CPLD), the processor can also adopt a multi-core architecture.

The processor is configured to execute any of the methods provided by the embodiments of the present disclosure according to the obtained executable instructions by calling the computer program stored in the memory. The processor and memory can also be physically separated.

It should be noted that the terminal provided by the embodiments of the present disclosure is a terminal that can perform the above-mentioned PRACH transmission method, then all the embodiments of the above-mentioned PRACH transmission method are applicable to the terminal, and can achieve the same or similar beneficial effects. No further details will be given here.

As shown in Figure 28, an embodiment of the present disclosure also provides a PRACH transmission device, including:

The first determination unit 501 is used to determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

The selection unit 502 is configured to select one SSB-associated RO group set or multiple SSB-associated RO group sets as transmission resources of the PRACH according to the mapping relationship; the RO group set includes at least one RO group;

The transmission unit 502 is configured to perform multiple PRACH transmissions according to the selected RO group set.

As an optional embodiment, the device further includes:

The third determination unit is used to determine the number M of PRACHs that are continuously transmitted using time division multiplexing, Determine the number of ROs included in a RO group as M; M is an integer greater than or equal to 1;

As an optional embodiment, the device further includes:

The fifth determination unit is used to determine the number of ROs included in an RO group as M*max(1,1/N );

As an optional embodiment, the device further includes:

The sixth determination unit is used to determine M*max(1, 1/N) index of RO.

As an optional embodiment, determining the mapping relationship between SSB sets and RO groups includes:

As an optional embodiment, when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in the different SSB sets can partial overlap;

or,

As an optional embodiment, the transmission resources of the PRACH include one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

It should be noted that the PRACH transmission device provided by the embodiments of the present disclosure is a device capable of executing the above-mentioned PRACH transmission method, then all embodiments of the above-mentioned PRACH transmission method are applicable to this device, and can achieve the same or similar performance. The beneficial effects will not be repeated here.

As shown in Figure 29, this embodiment of the present disclosure also provides a network device, including a memory 620, a transceiver 610, and a processor 600:

Memory 620, used to store computer programs; transceiver 610, used to send and receive data under the control of the processor; processor 600, used to read the computer program in the memory and perform the following operations:

As an optional embodiment, the processor 600 is also configured to read the computer program in the memory and perform the following operations:

As an optional embodiment, when an SSB-associated RO group set is used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/M rounds of all SSBs in the SSB set. Mapping, where n is an integer greater than or equal to 1;

or,

As an optional embodiment, the PRACH reception resources include one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

Optionally, in FIG. 29 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 600 and various circuits of the memory represented by memory 620 linked together. The bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are all well known in the art and therefore will not be described further herein. The bus interface provides the interface. The transceiver 610 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media. The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 600 when performing operations.

The processor 600 may be a central processing unit (Central Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device (CPLD), the processor can also adopt a multi-core architecture.

It should be noted that the network device provided by the embodiments of the present disclosure is a network device that can perform the above-mentioned PRACH receiving method, then all the embodiments of the above-mentioned PRACH receiving method are applicable to this network device, and can achieve the same or similar performance. The beneficial effects will not be repeated here.

As shown in Figure 30, an embodiment of the present disclosure also provides a PRACH receiving device, which includes:

The second determination unit 701 is used to determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

The receiving unit 702 is configured to collect RO groups associated with an SSB according to the mapping relationship. The PRACH is received on an RO group set associated with multiple SSBs; the RO group set includes at least one RO group.

As an optional embodiment, the device further includes:

The tenth determination unit is used to determine M*max(1, 1/N) index of RO.

As an optional embodiment, determining the mapping relationship between the SSB set and the RO group includes:

As an optional embodiment, the SSB set includes: all SSBs on the network side, or network Side part SSB.

or,

The first valid RO in the RO group set associated with the initial SSB;

or,

It should be noted that the PRACH receiving device provided by the embodiments of the present disclosure is a device capable of performing the above PRACH receiving method, then all embodiments of the above PRACH receiving method are applicable. used in this device, and can achieve the same or similar beneficial effects, and will not be repeated here.

It should be noted that the division of units in the embodiment of the present disclosure is schematic and is only a logical function division. In actual implementation, there may be other division methods. In addition, each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated units can be implemented in the form of hardware or software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure is essentially or contributes to the relevant technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, It includes several instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present disclosure. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code. .

An embodiment of the present disclosure also provides a processor-readable storage medium that stores a computer program, and the computer program is used to cause the processor to execute each step of the method embodiment as described above, The processor-readable storage medium may be any available media or data storage device that the processor can access, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (magneto-optical, MO), etc.), Optical storage (such as optical disc (Compact Disk, CD), high-density digital video disc (Digital Video Disc, DVD), Blu-ray Disc (Blu-ray Disc, BD), high-definition versatile disc (High-Definition Versatile Disc, HVD) etc.), and semiconductor memories (such as ROM, Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), non-volatile memory (NAND FLASH), solid state drive (Solid State Disk, SSD), etc.

Those skilled in the art will appreciate that embodiments of the present disclosure may be provided as methods, systems, or computer program products. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present disclosure may be employed in one or more In the form of a computer program product implemented on a computer-usable storage medium (including but not limited to disk storage and optical storage, etc.) optionally containing computer-usable program code.

The disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a process or processes of a flowchart and/or a block or blocks of a block diagram.

These processor-executable instructions may also be stored in a processor-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the generation of instructions stored in the processor-readable memory includes the manufacture of the instruction means product, the instruction device implements the function specified in one process or multiple processes in the flow chart and/or one block or multiple blocks in the block diagram.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby causing the computer or other programmable device to The instructions that are executed provide steps for implementing the functions specified in a process or processes of the flowchart diagrams and/or a block or blocks of the block diagrams.

It should be noted that it should be understood that the division of each module above is only a division of logical functions. In actual implementation, it can be fully or partially integrated into a physical entity, or it can also be physically separated. And these modules can all be implemented in the form of software calling through processing components; they can also all be implemented in the form of hardware; some modules can also be implemented in the form of software calling through processing components, and some modules can be implemented in the form of hardware. For example, the determination module can be a separate processing element, or can be integrated into a chip of the above device. In addition, it can also be stored in the memory of the above device in the form of program code, and can be processed by a certain processing element of the above device. Call and execute the functions of the above identified modules. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together or implemented independently. The processing element described here may be an integrated circuit with signal processing capabilities. During the implementation process, each step of the above method or each of the above modules can be completed by instructions in the form of hardware integrated logic circuits or software in the processor element.

For example, each module, unit, sub-unit or sub-module may be one or more integrated circuits configured to implement the above method, such as: one or more application specific integrated circuits (Application Specific Integrated Circuit, ASIC), or one or Multiple microprocessors (digital signal processor, DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), etc. For another example, when one of the above modules is implemented in the form of a processing element scheduler code, the processing element can be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processors that can call the program code. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

The terms "first", "second", etc. in the description and claims of the present disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the disclosure described herein may be implemented, for example, in sequences other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus that encompasses a series of steps or units and need not be limited to those explicitly listed. Those steps or elements may instead include other steps or elements not expressly listed or inherent to the process, method, product or apparatus. In addition, the use of "and/or" in the description and claims indicates at least optional one of the connected objects, such as A and/or B and/or C, indicating the inclusion of A alone, B alone, C alone, and A and B exists, both B and C exist, A and C exist, and there are 7 situations in which A, B, and C all exist. Similarly, the use of "at least one of A and B" in this specification and in the claims should be understood to mean "A alone, B alone, or both A and B present."

Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the disclosure. In this way, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and equivalent technologies, the present disclosure is also intended to include these modifications and variations.

Claims

A transmission method for physical random access channel PRACH, the method includes:

The terminal determines the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

The terminal selects one SSB-associated RO group set or multiple SSB-associated RO group sets as transmission resources of the PRACH according to the mapping relationship; the RO group set includes at least one RO group;

The terminal performs multiple PRACH transmissions according to the selected RO group set.
The method of claim 1, further comprising:

The terminal determines the number of ROs included in an RO group to be M based on the number M of PRACHs continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, N is the number of SSBs associated with an RO, and N is greater than 0.
The method of claim 2, further comprising:

The terminal determines the indexes of the M ROs in one RO group in the order of increasing the time domain resource index of the RO group in the first PRACH time slot and then increasing the PRACH time slot index.
The method of claim 1, further comprising:

The terminal determines the number of ROs included in an RO group to be M*max(1,1/N) based on the number M of PRACHs continuously transmitted using time division multiplexing and the number N of SSBs associated with an RO;

Among them, one SSB occupies one RO group for one mapping, M is an integer greater than or equal to 1; N is greater than 0.
The method of claim 4, further comprising:

The terminal determines M*max(1,1/N) in an RO group in the order of increasing the frequency domain resource index first, then increasing the time domain resource index of the RO group in the next PRACH time slot, and finally increasing the PRACH time slot index. The index of an RO.
The method according to any one of claims 2 to 5, wherein the value of M is less than or equal to the value of K;

Wherein, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The method according to claim 1, wherein the terminal determines the mapping relationship between the SSB set and the RO group, including:

The terminal maps each SSB in the SSB set to the RO group in a first order to obtain the mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is incremented, then the frequency domain resource index is incremented, then the RO group time slot resource index in a PRACH time slot is incremented; and finally the PRACH time slot index is incremented.
The method according to claim 1 or 7, wherein the SSB set includes: all SSBs on the network side, or some SSBs on the network side.
The method according to claim 8, wherein when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Wherein, the initial SSB is an SSB selected by the terminal that meets the access conditions during the random access process.
The method of claim 7, wherein

When an SSB-associated RO group set is used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/M times of round-robin mapping of all SSBs in the SSB set, where n is greater than or an integer equal to 1;

or,

When multiple SSB-associated RO group sets are used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, where n is an integer greater than or equal to 1;

Wherein, M is the number of PRACHs that are continuously transmitted using time division multiplexing, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the SSB. The number of all SSBs in the set.
The method according to claim 7, wherein in the case that the number of frequency domain ROs occupied by all SSBs included in the SSB set in round robin mapping is less than the number of frequency domain ROs configured by the network, The remaining RO groups in the frequency domain are no longer used for the next SSB round robin mapping.
The method according to claim 7, wherein when all the SSBs included in the SSB set are not mapped to an integer number of RO groups in one round, the remaining preamble in the last RO group is no longer used for the next SSB round. query mapping.
The method according to claim 1, wherein the selected set of RO groups associated with an SSB is: a set of RO groups associated with an initial SSB, and the initial SSB is a set of RO groups selected by the terminal during the random access process that meets the access conditions. SSB;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO; M is the number of PRACHs that use time division multiplexing for continuous transmission.
The method according to claim 13, wherein the transmission resources of the PRACH include one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The method according to claim 1, wherein the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

Wherein, the starting RO group of the PRACH transmission is the RO group associated with the initial SSB; the initial SSB is the SSB selected by the terminal during the random access process that meets the access conditions.
The method according to any one of claims 12 to 15, wherein the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.
The method according to any one of claims 12-15, wherein there are no The preamble index ranges corresponding to multiple RO groups associated with the SSB are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different.
A method for receiving PRACH, the method includes:

The network device determines the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

The network device receives the PRACH on one SSB-associated RO group set or multiple SSB-associated RO group sets according to the mapping relationship; the RO group set includes at least one RO group.
The method of claim 18, further comprising:

The network device determines the number of ROs included in an RO group to be M based on the number M of PRACHs continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, N is the number of SSBs associated with an RO, and N is greater than 0.
The method of claim 19, further comprising:

The network device determines the indexes of the M ROs in one RO group in the order of increasing the time domain resource index of the RO group in the first PRACH time slot and then increasing the PRACH time slot index.
The method of claim 18, further comprising:

The network device determines the number of ROs included in an RO group to be M*max(1,1/N) based on the number M of PRACHs continuously transmitted using time division multiplexing and the number N of SSBs associated with an RO;

Among them, one SSB occupies one RO group for one mapping, M is an integer greater than or equal to 1; N is greater than 0.
The method of claim 21, further comprising:

The network device determines the M*max (1,1/N ) index of RO.
The method according to any one of claims 19-22, wherein the value of M is less than or equal to the value of K;

Among them, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The method according to claim 18, wherein the network device determines the mapping relationship between the SSB set and the RO group, including:

The network device maps each SSB in the SSB set to the RO group in a first order to obtain a mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is increased, then the frequency domain resource index is increased, then the time slot resource index of the RO group in a PRACH time slot is increased; and finally, the PRACH time slot index is increased in order.
The method according to claim 18 or 24, wherein the SSB set includes: all SSBs on the network side, or some SSBs on the network side.
The method according to claim 25, wherein when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Wherein, the initial SSB is an SSB selected by the terminal that meets the access conditions during the random access process.
The method of claim 24, wherein:

When an SSB-associated RO group set is used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/M times of round-robin mapping of all SSBs in the SSB set, where n is greater than or an integer equal to 1;

or,

When multiple SSB-associated RO group sets are used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, where n is an integer greater than or equal to 1;

Among them, M is the number of PRACHs that use time division multiplexing for continuous transmission, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the number of PRACH transmissions within the SSB set. The number of all SSBs.
The method according to claim 24, wherein when the number of frequency domain ROs occupied by all SSBs included in the SSB set in round robin mapping is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain are no longer Used for the next SSB round robin mapping.
The method according to claim 24, wherein when all the SSBs included in the SSB set are not mapped to an integer number of RO groups in one round, the remaining preamble in the last RO group is no longer used for the next SSB round. query mapping.
The method according to claim 18, wherein the selected set of RO groups associated with an SSB is: a set of RO groups associated with an initial SSB, and the initial SSB is a set of RO groups selected by the terminal during the random access process that meets the access conditions. SSB;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO; M is the number of PRACHs that use time division multiplexing for continuous transmission.
The method according to claim 30, wherein the receiving resources of the PRACH include one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The method according to claim 18, wherein the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

Wherein, the starting RO group of the PRACH transmission is the RO group associated with the initial SSB; the initial SSB is the SSB selected by the terminal during the random access process that meets the access conditions.
The method according to any one of claims 29 to 32, wherein the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.
The method according to any one of claims 29 to 32, wherein the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different.
A terminal including memory, transceiver, and processor:

Memory, used to store computer programs; transceiver, used to send and receive data under the control of the processor; processor, used to read the computer program in the memory and perform the following operations:

Determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

According to the mapping relationship, select one SSB-associated RO group set or multiple SSB-associated RO group sets as the transmission resources of the PRACH; the RO group set includes at least one RO group;

According to the selected RO group set, multiple PRACH transmissions are performed.
The terminal according to claim 35, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

According to the number M of PRACHs that are continuously transmitted using time division multiplexing, the number of ROs included in an RO group is determined to be M; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, N is the number of SSBs associated with an RO, and N is greater than 0.
The terminal according to claim 36, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

The indexes of M ROs in a RO group are determined in the order that the time domain resource index of the RO group in the first PRACH time slot increases first, and then the PRACH time slot index increases.
The terminal according to claim 35, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

According to the number M of PRACHs that are continuously transmitted using time division multiplexing, and the number N of SSBs associated with an RO, the number of ROs included in a RO group is determined to be M*max(1,1/N);

Among them, one SSB occupies one RO group for one mapping, M is an integer greater than or equal to 1; N is greater than 0.
The terminal according to claim 38, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

According to the order of increasing the frequency domain resource index first, then increasing the time domain resource index of the RO group in the next PRACH slot, and finally increasing the PRACH slot index, determine the M*max (1,1/N) ROs in a RO group. index.
The terminal according to any one of claims 36 to 39, wherein the value of M is less than or equal to the value of K;

Wherein, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The terminal according to claim 35, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

Each SSB in the SSB set is mapped to the RO group in the first order to obtain the mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is incremented, then the frequency domain resource index is incremented, then the RO group time slot resource index in a PRACH time slot is incremented; and finally the PRACH time slot index is incremented.
The terminal according to claim 35 or 41, wherein the SSB set includes: all SSBs on the network side, or some SSBs on the network side.
The terminal according to claim 42, wherein when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Wherein, the initial SSB is an SSB selected by the terminal that meets the access conditions during the random access process.
The terminal according to claim 41, wherein when an SSB-associated RO group set is used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/M times all the SSB sets in the SSB set. Round robin mapping of SSB, where n is an integer greater than or equal to 1;

or,

When multiple SSB-associated RO group sets are used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, Where n is an integer greater than or equal to 1;

Wherein, M is the number of PRACHs that are continuously transmitted using time division multiplexing, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the SSB. The number of all SSBs in the set.
The terminal according to claim 41, wherein when the number of frequency domain ROs occupied by all SSBs included in the SSB set in round robin mapping is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain are no longer Used for the next SSB round robin mapping.
The terminal according to claim 41, wherein when all the SSBs included in the SSB set are not mapped to an integer number of RO groups in one round, the remaining preamble in the last RO group is no longer used for the next SSB round. query mapping.
The terminal according to claim 35, wherein the selected RO group set associated with an SSB is: an initial SSB associated RO group set, and the initial SSB is the RO group set selected by the terminal during the random access process to meet the access conditions. SSB;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO; M is the number of PRACHs that use time division multiplexing for continuous transmission.
The terminal according to claim 47, wherein the transmission resource of the PRACH includes one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The terminal according to claim 35, wherein the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

Wherein, the starting RO group of the PRACH transmission is the RO group associated with the initial SSB; the initial SSB is the SSB selected by the terminal during the random access process that meets the access conditions.
The terminal according to any one of claims 46 to 49, wherein the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.
The terminal according to any one of claims 46 to 49, wherein the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different.
A PRACH transmission device, including:

The first determination unit is used to determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein one SSB set includes at least one SSB; one RO group includes at least one RO;

A selection unit configured to select one SSB-associated RO group set or multiple SSB-associated RO group sets as transmission resources of the PRACH according to the mapping relationship; the RO group set includes at least one RO group;

The transmission unit is used to perform multiple PRACH transmissions according to the selected RO group set.
The device of claim 52, further comprising:

The third determination unit is used to determine the number of ROs included in an RO group to be M based on the number M of PRACHs continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, N is the number of SSBs associated with an RO, and N is greater than 0.
The device of claim 53, further comprising:

The fourth determination unit is used to determine the indexes of M ROs in a RO group in the order that the time domain resource index of the RO group in the first PRACH time slot increases first, and then the PRACH time slot index increases.
The device of claim 52, further comprising:

The fifth determination unit is used to determine the number of ROs included in an RO group as M*max(1,1/N );

Among them, one SSB mapping occupies one RO group at a time, and M is an integer greater than or equal to 1; N is greater than 0.
The device of claim 55, further comprising:

The sixth determination unit is used to determine M*max(1, 1/N) index of RO.
The device according to any one of claims 53-56, wherein the value of M is less than or equal to the value of K;

Among them, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The device according to claim 52, wherein determining the mapping relationship between the SSB set and the RO group includes:

Each SSB in the SSB set is mapped to the RO group in the first order to obtain the mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is incremented, then the frequency domain resource index is incremented, then the RO group time slot resource index in a PRACH time slot is incremented; and finally the PRACH time slot index is incremented.
The device according to claim 52 or 58, wherein the SSB set includes: all SSBs on the network side, or some SSBs on the network side.
The device according to claim 59, wherein when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Wherein, the initial SSB is an SSB selected by the terminal that meets the access conditions during the random access process.
The device according to claim 58, wherein when an SSB-associated RO group set is used for PRACH transmission, a complete SSB-to-RO mapping cycle includes: n*K/M times all the SSB-related RO groups in the SSB set. Round robin mapping of SSB, where n is an integer greater than or equal to 1;

or,

In the case of using multiple SSB associated RO group sets for PRACH transmission, a complete The entire SSB to RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, where n is an integer greater than or equal to 1;

Wherein, M is the number of PRACHs that are continuously transmitted using time division multiplexing, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the SSB. The number of all SSBs in the set.
The device according to claim 58, wherein when the number of frequency domain ROs occupied by all SSBs included in the SSB set in round robin mapping is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain are no longer Used for the next SSB round robin mapping.
The apparatus according to claim 58, wherein when all the SSBs included in the SSB set are not mapped to an integer number of RO groups in one round, the remaining preamble in the last RO group is no longer used for the next SSB round. query mapping.
The device according to claim 52, wherein the selected set of RO groups associated with an SSB is: a set of RO groups associated with an initial SSB, and the initial SSB is a set of RO groups selected by the terminal during the random access process that meets the access conditions. SSB;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO; M is the number of PRACHs that use time division multiplexing for continuous transmission.
The device according to claim 64, wherein the transmission resource of the PRACH includes one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The device according to claim 52, wherein the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

Wherein, the starting RO group of the PRACH transmission is the RO group associated with the initial SSB; the initial SSB is the SSB selected by the terminal during the random access process that meets the access conditions.
The device according to any one of claims 63 to 66, wherein the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.
The device according to any one of claims 63 to 66, wherein the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different.
A network device, including memory, transceiver, and processor:

Memory, used to store computer programs; transceiver, used to send and receive data under the control of the processor; processor, used to read the computer program in the memory and perform the following operations:

Determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

According to the mapping relationship, PRACH is received on one SSB-associated RO group set or multiple SSB-associated RO group sets; the RO group set includes at least one RO group.
The network device of claim 69, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

According to the number M of PRACHs that are continuously transmitted using time division multiplexing, the number of ROs included in an RO group is determined to be M; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, N is the number of SSBs associated with an RO, and N is greater than 0.
The network device of claim 70, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

The indexes of M ROs in a RO group are determined in the order that the time domain resource index of the RO group in the first PRACH time slot increases first, and then the PRACH time slot index increases.
The network device of claim 69, wherein the processor is further configured to read the A computer program in memory that performs the following operations:

According to the number M of PRACHs that are continuously transmitted using time division multiplexing, and the number N of SSBs associated with an RO, the number of ROs included in a RO group is determined to be M*max(1,1/N);

Among them, one SSB occupies one RO group for one mapping, M is an integer greater than or equal to 1; N is greater than 0.
The network device of claim 72, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

According to the order of increasing the frequency domain resource index first, then increasing the time domain resource index of the RO group in the next PRACH slot, and finally increasing the PRACH slot index, determine the M*max (1,1/N) ROs in a RO group. index.
The network device according to any one of claims 70-73, wherein the value of the processor M is less than or equal to the value of K;

Wherein, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The network device of claim 69, wherein the processor is further configured to read the computer program in the memory and perform the following operations:

The network device maps each SSB in the SSB set to the RO group in a first order to obtain a mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is increased, then the frequency domain resource index is increased, then the time slot resource index of the RO group in a PRACH time slot is increased; and finally, the PRACH time slot index is increased in order.
The network device according to claim 69 or 75, wherein the SSB set includes: all SSBs on the network side, or some SSBs on the network side.
The network device according to claim 76, wherein when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Wherein, the initial SSB is an SSB selected by the terminal that meets the access conditions during the random access process.
The network device according to claim 75, wherein when an SSB-associated RO group set is used for PRACH reception, a complete SSB-to-RO mapping cycle includes: Round-robin mapping of all SSBs in the SSB set n*K/M times, where n is an integer greater than or equal to 1;

or,

When multiple SSB-associated RO group sets are used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, Where n is an integer greater than or equal to 1;

Wherein, M is the number of PRACHs that are continuously transmitted using time division multiplexing, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the SSB. The number of all SSBs in the set.
The network device according to claim 75, wherein when the number of frequency domain ROs occupied by all SSBs included in the SSB set in round robin mapping is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain are not Then used for the next SSB round robin mapping.
The network device according to claim 75, wherein when all SSBs included in the SSB set are not mapped to an integer number of RO groups in one round robin, the remaining preamble in the last RO group is no longer used for the next SSB. Polling mapping.
The network device according to claim 69, wherein the selected RO group set associated with an SSB is: an initial SSB associated RO group set, and the initial SSB is one selected by the terminal during the random access process and satisfies access conditions. SSB;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO; M is the number of PRACHs that use time division multiplexing for continuous transmission.
The network device according to claim 81, wherein the reception resource of the PRACH includes one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The terminal supports a single random access The maximum number of PRACH transmissions during machine access or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The network device according to claim 69, wherein the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

Wherein, the starting RO group of the PRACH transmission is the RO group associated with the initial SSB; the initial SSB is the SSB selected by the terminal during the random access process that meets the access conditions.
The network device according to any one of claims 80 to 83, wherein the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.
The network device according to any one of claims 80 to 83, wherein the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different.
A PRACH receiving device, including:

The second determination unit is used to determine the mapping relationship between the synchronization signal and the physical broadcast channel block SSB set and the random access channel access opportunity RO group; wherein, one SSB set includes at least one SSB; one RO group includes at least one RO;

A receiving unit configured to receive PRACH on one SSB-associated RO group set or multiple SSB-associated RO group sets according to the mapping relationship; the RO group set includes at least one RO group.
The device of claim 86, further comprising:

The seventh determination unit is used to determine the number of ROs included in an RO group to be M based on the number M of PRACHs that are continuously transmitted using time division multiplexing; M is an integer greater than or equal to 1;

Among them, one SSB mapping occupies max (1,1/N) RO groups, N is the number of SSBs associated with an RO, and N is greater than 0.
The device of claim 87, further comprising:

The eighth determination unit is used to determine the indexes of M ROs in a RO group in the order that the time domain resource index of the RO group in the first PRACH time slot increases first, and then the PRACH time slot index increases.
The device of claim 86, further comprising:

The ninth determination unit is used to determine the number of ROs included in an RO group to be M*max (1,1/N );

Among them, one SSB occupies one RO group for one mapping, M is an integer greater than or equal to 1; N is greater than 0.
The device of claim 89, further comprising:

The tenth determination unit is used to determine M*max(1, 1/N) index of RO.
The device according to any one of claims 87-90, wherein the value of M is less than or equal to the value of K;

Among them, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal; or, K is the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The device according to claim 86, wherein the determining the mapping relationship between the SSB set and the RO group includes:

Each SSB in the SSB set is mapped to the RO group in the first order to obtain the mapping relationship between the SSB set and the RO group; wherein the first order includes:

First, the preamble index in an RO group is increased, then the frequency domain resource index is increased, then the time slot resource index of the RO group in a PRACH time slot is increased; and finally, the PRACH time slot index is increased in order.
The apparatus according to claim 86 or 92, wherein the SSB set includes: all SSBs on the network side, or some SSBs on the network side.
The device according to claim 93, wherein when the SSB set includes some SSBs on the network side, different initial SSBs correspond to different SSB sets, and the SSBs included in different SSB sets may partially overlap;

Wherein, the initial SSB is an SSB selected by the terminal that meets the access conditions during the random access process.
The apparatus according to claim 92, wherein when an SSB-associated RO group set is used for PRACH reception, a complete SSB-to-RO mapping cycle includes: Round-robin mapping of all SSBs in the SSB set n*K/M times, where n is an integer greater than or equal to 1;

or,

When multiple SSB-associated RO group sets are used for PRACH reception, a complete SSB-to-RO mapping cycle includes: n*K/(M*s) round-robin mapping of all SSBs in the SSB set, where n is an integer greater than or equal to 1;

Among them, M is the number of PRACHs that use time division multiplexing for continuous transmission, K is the maximum number of PRACH transmissions in a single random access process supported by the terminal or the number of PRACH transmissions corresponding to multiple PRACH transmission levels, and s is the number of PRACH transmissions within the SSB set. The number of all SSBs.
The apparatus according to claim 92, wherein when the number of frequency domain ROs occupied by all SSBs included in the SSB set in round robin mapping is less than the number of frequency division ROs configured by the network, the remaining RO groups in the frequency domain are no longer Used for the next SSB round robin mapping.
The apparatus according to claim 92, wherein when all the SSBs included in the SSB set are not mapped to an integer number of RO groups in one round, the remaining preamble in the last RO group is no longer used for the next SSB round. query mapping.
The device according to claim 86, wherein the selected set of RO groups associated with an SSB is: a set of RO groups associated with an initial SSB, and the initial SSB is a set of RO groups selected by the terminal during the random access process that meets the access conditions. SSB;

The RO group set associated with the initial SSB includes: K/(M*max(1,1/N)) RO groups; where K is the maximum number of PRACH transmissions in a single random access process supported by the terminal. Or the number of PRACH transmissions corresponding to multiple PRACH transmission levels; N is the number of SSBs associated with an RO; M is the number of PRACHs that use time division multiplexing for continuous transmission.
The device according to claim 98, wherein the reception resource of the PRACH includes one or more starting positions; wherein the starting positions are:

The first valid RO in the RO group set associated with the initial SSB;

or,

The initial SSB associated RO group set within the RO, where i∈{0,1,…,K/numK-1}, numK is the number of PRACHs actually transmitted by the terminal during the random access process; N is the number of SSBs associated with an RO; K is The terminal supports a single random access The maximum number of PRACH transmissions during machine access or the number of PRACH transmissions corresponding to multiple PRACH transmission levels.
The apparatus according to claim 86, wherein the selected multiple SSB-associated RO group sets are: all SSB-associated RO group sets included in the SSB set;

Wherein, the starting RO group of the PRACH transmission is the RO group associated with the initial SSB; the initial SSB is the SSB selected by the terminal during the random access process that meets the access conditions.
The device according to any one of claims 97-100, wherein the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups mapped to the same SSB in the RO group set are different.
The device according to any one of claims 97-100, wherein the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are the same;

Alternatively, the preamble index ranges corresponding to multiple RO groups associated with different SSBs in the RO group set are different.
A processor-readable storage medium, the processor-readable storage medium stores a computer program, the computer program is used to cause the processor to execute the method described in any one of claims 1 to 17, or the A computer program is used to cause the processor to perform the method of any one of claims 18 to 34.