WO2023151508A1

WO2023151508A1 - Communication method and apparatus, terminal device, and network device

Info

Publication number: WO2023151508A1
Application number: PCT/CN2023/074259
Authority: WO
Inventors: 杨苑青; 雷珍珠
Original assignee: 展讯半导体(南京)有限公司
Priority date: 2022-02-11
Filing date: 2023-02-02
Publication date: 2023-08-17
Also published as: CN116634592A

Abstract

Disclosed in the present application are a communication method and apparatus, a terminal device and a network device. The method comprises: the network device sending indication information which is used for indicating K_i, wherein K_i is the number of repetitions of a random access request message corresponding to an SSB index i in a first cell, 1≤i≤M, M being the total number of SSBs in the first cell, and K_i being a positive integer greater than or equal to 1; the terminal device receiving the indication information; and the terminal device sending the random access request message according to K_i, the SSB indicated by the SSB index i being the SSB selected by the terminal device from the monitored SSBs. Therefore, according to the present application, the number of repetitions of the random access request message corresponding to the SSB index can be indicated by means of the indication information, and the random access request message is sent according to the number of repetitions of the random access request message to achieve coverage enhancement, thereby helping to improve the transmission reliability of the random access request message and improve the possibility of successful random access of the terminal device.

Description

Communication method and device, terminal equipment and network equipment

technical field

The present application relates to the technical field of communication, and in particular to a communication method and device, terminal equipment and network equipment.

Background technique

Compared with the terrestrial network communication system, the non-terrestrial network (NTN) communication system has a larger propagation delay, so the communication method in the terrestrial communication system is no longer applicable to the NTN communication system.

In the NTN communication system, the third generation partnership project (3rd generation partnership project, 3GPP) standard usually assumes that the antenna gain of the terminal equipment is 0dBi, but in the actual communication process, the antenna gain of the terminal equipment often cannot meet the above requirements . Since the antenna gain of the terminal device cannot meet the requirement, when the terminal device performs random access, the network device may not successfully receive the random access request message (such as message 1 or Msg1 ) sent by the terminal device.

Contents of the invention

The present application provides a communication method and device, terminal equipment, and network equipment, in order to achieve coverage enhancement, improve transmission reliability of random access request messages, and increase the possibility of successful random access of terminal equipment.

The first aspect is a communication method of the present application, which is applied to a terminal device; the method includes:

receiving indication information, where the indication information is used to indicate K _i , where K _i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤M, and the M is the total number of SSBs in the first cell, and the K _i is a positive integer greater than or equal to 1;

According to the K _i , a random access request message is sent, and the SSB indicated by the SSB index i is the SSB selected by the terminal device from the monitored SSBs.

In this embodiment of the present application, the instruction information is introduced so that the network device can indicate to the terminal device the number of repetitions of the random access request message configured for the SSB index or SSB through the instruction information, and then the terminal device can perform random access according to the selected SSB. The random access request message is sent multiple times to the network device according to the number of repetitions of the incoming request message, which helps to achieve coverage enhancement, improve the transmission reliability of the random access request message, and increase the possibility of successful random access of the terminal device.

In some possible implementations, the first cell is a serving cell of the terminal device. For example, for a terminal device in a connected state, an idle state or an inactive state, the first cell is a serving cell of the terminal device. Alternatively, the first cell is a cell where the terminal equipment resides. For example, for a terminal device that initially accesses the network, the first cell is the cell where the terminal device resides. It should be noted that, in the embodiment of the present application, the terminal device initially accesses the network, and the cell where the terminal resides may also be understood as the serving cell of the terminal device.

The second aspect is a communication method of the present application, which is applied to a network device; the method includes:

sending indication information, where the indication information is used to indicate K _i , where K _i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤M, and the M is the total number of SSBs in the first cell, and the K _i is a positive integer greater than or equal to 1.

The third aspect is a communication device of the present application, which includes:

A receiving unit, configured to receive indication information, where the indication information is used to indicate K _i , where K _i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤ M, where M is the total number of SSBs in the first cell, and K _i is a positive integer greater than or equal to 1;

A sending unit, configured to send a random access request message according to the K _i , where the SSB indicated by the SSB index i is the SSB selected by the terminal device from the monitored SSBs.

The fourth aspect is a communication device of the present application, which includes:

A sending unit, configured to send indication information, where the indication information is used to indicate K _i , where K _i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤ M, where M is the total number of SSBs in the first cell, and K _i is a positive integer greater than or equal to 1.

The fifth aspect is a terminal device of the present application, including a processor, a memory, and computer programs or instructions stored in the memory, wherein, the processor executes the computer program or instructions to realize the above first aspect steps in the designed method.

The sixth aspect is a network device of the present application, including a processor, a memory, and a computer program or instruction stored on the memory, wherein the processor executes the computer program or instruction to realize the above-mentioned second aspect steps in the designed method.

A seventh aspect is a chip of the present application, including a processor, wherein the processor executes the steps in the method designed in the above-mentioned first aspect or the second aspect.

The eighth aspect is a chip module of the present application, including a transceiver component and a chip, and the chip includes a processor, wherein the processor The processor executes the steps in the method designed in the first aspect or the second aspect above.

The ninth aspect is a computer-readable storage medium of the present application, wherein the computer-readable storage medium stores computer programs or instructions, and when the computer programs or instructions are executed, the above-mentioned first or second aspect is realized steps in the designed method.

The tenth aspect is a computer program product of the present application, including computer programs or instructions, wherein when the computer programs or instructions are executed, the steps in the method designed in the first aspect or the second aspect above are realized. Exemplarily, the computer program product may be a software installation package.

For the beneficial effects brought by the technical solutions of the second aspect to the tenth aspect, please refer to the technical effects brought by the technical solution of the first aspect, which will not be repeated here.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the embodiments of the present application.

FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the architecture of a transparent satellite communication system according to an embodiment of the present application;

3 is a schematic structural diagram of a beam generated by a satellite on the ground according to an embodiment of the present application;

4 is a schematic structural diagram of comparing signal reception quality between a land network communication system and an NTN communication system according to an embodiment of the present application;

Fig. 5 is the architectural diagram of the architecture comparison of a kind of NTN communication system of the embodiment of the present application;

FIG. 6 is a schematic flow diagram of a 4-step random access according to an embodiment of the present application;

FIG. 7 is a schematic flow diagram of a two-step random access according to an embodiment of the present application;

8 to 10 are schematic diagrams of a mapping relationship between an SSB and an RO according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a scenario of configuring the number of repetitions of Msg1 to the SSB index according to an embodiment of the present application;

FIG. 12 to FIG. 31 are schematic diagrams of another mapping relationship between SSB and RO according to the embodiment of the present application;

Fig. 32 is a schematic diagram of another scenario of configuring the number of repetitions of Msg1 to the SSB index according to the embodiment of the present application;

FIG. 33 to FIG. 36 are schematic diagrams of another mapping relationship between SSB and RO according to the embodiment of the present application;

FIG. 37 is a schematic diagram of another scenario of configuring the number of repetitions of Msg1 to the SSB index according to the embodiment of the present application;

FIG. 38 to FIG. 47 are schematic diagrams of another mapping relationship between SSB and RO according to the embodiment of the present application;

FIG. 48 is a schematic flowchart of a communication method according to an embodiment of the present application;

FIG. 49 is a block diagram of functional units of a communication device according to an embodiment of the present application;

FIG. 50 is a block diagram of functional units of another communication device according to an embodiment of the present application;

FIG. 51 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

Fig. 52 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed ways

It should be understood that the terms "first", "second" and the like involved in the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, software, product, or device that includes a series of steps or units is not limited to the listed steps or units, but also includes steps or units that are not listed, or includes , other steps or units inherent in the product or equipment.

The "embodiments" referred to in the embodiments of the present application means that specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

"At least one" in the embodiments of the present application refers to one or more, and multiple refers to two or more.

"And/or" in the embodiment of this application describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which may indicate the following three situations: A exists alone, and A and B exist simultaneously , B exists alone. Wherein, A and B may be singular or plural. The character "/" can indicate that the contextual objects are an "or" relationship. In addition, the symbol "/" can also represent a division sign, that is, to perform a division operation.

"At least one of the following" or similar expressions in the embodiments of the present application refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one item (piece) of a, b or c can represent the following seven situations: a, b, c, a and b, a and c, b and c, a, b and c. Wherein, each of a, b, and c may be an element, or a set containing one or more elements.

The embodiments of the present application refer to "of", "corresponding, relevant", "corresponding", and "associated "(associated, related)" and "mapped" can sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, the concepts or meanings to be expressed are consistent.

"Network" in the embodiments of the present application may be expressed as the same concept as "system", and a communication system is a communication network.

The "connection" in the embodiments of the present application refers to various connection modes such as direct connection or indirect connection, so as to realize communication between devices, which is not specifically limited.

The relevant content involved in the technical solutions of the embodiments of the present application will be specifically introduced below.

1. Wireless communication systems, terminal equipment, satellites, non-terrestrial network gateways and network equipment

1) Wireless communication system

The technical solution of the embodiment of the present application can be applied to various wireless communication systems, such as: Long Term Evolution (Long Term Evolution, LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (New Radio , NR) system, evolution system of NR system, LTE (LTE-based Access to Unlicensed Spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based Access to Unlicensed Spectrum, NR-U) system on unlicensed spectrum ) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunications System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi) , 6th generation (6th-Generation, 6G) communication system or other communication systems, etc.

The number of connections supported by traditional wireless communication systems is limited and easy to implement. With the development of communication technology, the wireless communication system can not only support the traditional wireless communication system, but also support such as device to device (device to device, D2D) communication, machine to machine (machine to machine, M2M) communication, machine type communication (machine type communication, MTC), inter-vehicle (vehicle to vehicle, V2V) communication, vehicle networking (vehicle to everything, V2X) communication, narrow band Internet of things (narrow band internet of things, NB-IoT) communication, etc. The technical solutions of the embodiments of the present application may also be applied to the foregoing wireless communication system, or the foregoing traditional wireless communication system.

Exemplarily, the embodiments of the present application may be applied to beamforming (beamforming), carrier aggregation (carrier aggregation, CA), dual connectivity (dual connectivity, DC) or independent (standalone, SA) deployment scenarios, and the like.

Or, as another example, the embodiments of the present application may be applied to a communication scenario of an unlicensed spectrum. Wherein, in the embodiment of the present application, the unlicensed spectrum may also be regarded as the shared spectrum. Alternatively, the embodiments of the present application may also be applied to licensed spectrum. Wherein, the licensed spectrum can also be regarded as a non-shared spectrum.

In some embodiments, the technical solutions of the embodiments of the present application may be applied to an NTN communication system, for example, a satellite communication system. For satellite communication systems, usually network equipment communicates with ground terminal equipment through satellites.

Exemplarily, an NTN communication system according to an embodiment of the present application is shown in FIG. 1 . The NTN communication system 10 may include a terminal device 110 , a reference point (reference point) 120 , a satellite 130 , a non-terrestrial network gateway (NTN gateway) 140 and a network device 150 . Wherein, the terminal device 110 , the non-terrestrial network gateway 140 and the network device 150 may be located on the earth's surface, while the satellite 130 is located in the earth's orbit. The satellite 130 can provide communication services to the geographical area covered by the signal, and can communicate with the terminal device 110 located in the signal coverage area.

Wherein, the terminal device 110 is located in a certain cell or beam, and the cell includes a reference point 120 . In addition, the wireless communication link between the terminal device 110 and the satellite 130 is called a service link. The wireless communication link between the satellite 130 and the non-terrestrial network gateway 140 is called a feeder link.

It should be noted that the non-terrestrial network gateway 140 and the network device 150 may be integrated into the same device, or may be independent devices, which is not specifically limited.

2) Terminal equipment

In the embodiment of the present application, the terminal equipment may be a device with transceiver function, and may also be called user equipment (user equipment, UE), remote terminal equipment (remote UE), relay equipment (relay UE), access Terminal equipment, subscriber unit, subscriber station, mobile station, mobile station, remote station, mobile equipment, subscriber terminal equipment, intelligent terminal equipment, wireless communication equipment, user agent or user device. It should be noted that a relay device is a terminal device capable of providing relay and forwarding services for other terminal devices (including remote terminal devices).

In addition, the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), with Handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in next-generation communication systems (such as NR communication systems, 6G communication systems), or public land for future evolution Terminal equipment in a mobile communication network (public land mobile network, PLMN), etc., is not specifically limited.

In this embodiment of the application, terminal devices can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; can be deployed on water (such as ships, etc.); can be deployed in the air (such as aircraft, balloons and satellites, etc.).

In the embodiment of the present application, the terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device , wireless terminal equipment in industrial control, wireless terminal equipment in unmanned automatic driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid, transportation safety ( Wireless terminal equipment in transportation safety, wireless terminal equipment in smart city (smart city) or wireless terminal equipment in smart home (smart home), etc.

In the embodiment of the present application, the terminal device may include an apparatus with a wireless communication function, such as a chip system, a chip, or a chip module. Exemplarily, the chip system may include a chip, and may also include other discrete devices.

3) Satellite

In the embodiment of the present application, the satellite may be a spacecraft carrying a transparent payload (or called a bent pipe payload) or a regenerative payload signal transmitter, that is, a transparent payload. Satellite (Transparent satellite) or regenerative satellite (Regenerative satellite).

Specifically, satellites can be divided into low earth orbit (LEO) satellites, medium earth orbit (MEO) satellites, geostationary earth orbit (GEO) satellites and high Elliptical orbit (high elliptical orbit, HEO) satellites, etc. Exemplarily, the operating orbit altitude of the LEO satellite is between 300km and 1500km. The orbital altitude of MEO satellites is between 7000km and 25000km. The orbital altitude of GEO satellites is 35786km. The orbital altitude of HEO satellites is between 400km and 50,000km.

4) Non-terrestrial network gateway

In the embodiment of this application, the non-terrestrial network gateway can be an earth station or gateway located on the ground, which can provide sufficient radio frequency (radio frequency, RF) power and RF sensitivity to realize the communication between ground equipment (such as network equipment) and satellites. connect. The non-terrestrial network gateway is a node of the transport network layer (TNL).

5) Network equipment

In the embodiment of the present application, the network device is a device having a sending and receiving function, and is used for communicating with a terminal device. For example, the network device may be responsible for radio resource management (radio resource management, RRM), quality of service (quality of service, QoS) management, data compression and encryption, data sending and receiving, etc. on the air interface side. Wherein, the network device may be a base station (base station, BS) in a communication system or a device deployed in a radio access network (radio access network, RAN) to provide a wireless communication function. For example, the evolved node B (evolutional node B, eNB or eNodeB) in the LTE communication system, the next generation evolved node B (next generation evolved node B, ng-eNB) in the NR communication system, and the The next generation node B (next generation node B, gNB), the master node (master node, MN) in the dual connection architecture, the second node or the secondary node (secondary node, SN) in the dual connection architecture, etc., will not be specified. limit.

In the embodiment of the present application, the network device can also be a device in the core network (core network, CN), such as access and mobility management function (access and mobility management function, AMF), user plane function (user plane function, UPF) etc.; it can also be an access point (access point, AP) in a wireless local area network (wireless local area network, WLAN), a relay station, a communication device in a future evolved PLMN network, a communication device in an NTN network, etc.

In the embodiment of the present application, the network device may include an apparatus that provides a wireless communication function for the terminal device, such as a chip system, a chip, or a chip module. Exemplarily, the chip system may include a chip, or may include other discrete devices.

In the embodiment of the present application, the network device may communicate with an Internet Protocol (Internet Protocol, IP) network. For example, the Internet (internet), a private IP network or other data networks and the like.

In some possible network deployments, the network device may be an independent node to implement the functions of the base station, or the network device may include two or more independent nodes to implement the functions of the base station. For example, the network device includes a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU), such as gNB-CU and gNB-DU. Furthermore, in some other embodiments of the present application, the network device may further include an active antenna unit (active antenna unit, AAU). Among them, the CU implements a part of the functions of the network equipment, and the DU implements another part of the functions of the network equipment. For example, the CU is responsible for processing non-real-time protocols and services, implementing the radio resource control (radio resource control, RRC) layer, service data adaptation protocol (service data adaptation protocol, SDAP) layer, and packet data convergence (packet data convergence protocol, PDCP) layer function. The DU is responsible for processing physical layer protocols and real-time services, and realizes functions of a radio link control (radio link control, RLC) layer, a medium access control (medium access control, MAC) layer, and a physical (physical, PHY) layer. In addition, the AAU can implement some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this network deployment, high-level signaling (such as RRC signaling) can be considered to be sent by the DU, or Sent jointly by DU and AAU. It can be understood that the network device may include at least one of CU, DU, and AAU. In addition, the CU can be divided into network devices in the RAN, or the CU can also be divided into network devices in the core network, which is not specifically limited.

In the embodiment of the present application, the network device can provide services for a cell, and the terminal devices in the cell can communicate with the network device through transmission resources (such as spectrum resources). Wherein, the cell may be a macro cell, a small cell, a metro cell, a micro cell, a pico cell, a femto cell, and the like.

6) Exemplary instructions

Exemplarily, a transparent satellite (transparent satellite) communication system is adopted in the embodiment of the present application. Among them, the transparent satellite (Transparent satellite) communication system adopts transparent payload. The schematic diagram of the transparent satellite communication system architecture is shown in Fig. 2 . Among them, the terminal equipment, non-terrestrial network gateway and gNB are located on the earth's surface, and the satellite is located in the earth's orbit. Satellites, non-terrestrial network gateways and gNBs form a radio access network (NG-radio access network, NG-RAN). NG-RAN is connected to the 5G core network through the NG interface.

2. NTN communication system

(1) NTN communication system and land network communication system

In the NTN communication system, satellites usually generate one or more beams (beams, or beam footprints) within a given service area, and the shape of the beams is usually elliptical. For example, related descriptions can refer to 3GPP standards. Among them, the beams generated by some satellites (such as LEO satellites) will also move with the movement of the satellite in a fixed orbit; or, the beams generated by some satellites (such as LEO satellites or GEO satellites) on the ground will not move with the movement of the satellite The movement of the satellite in a fixed orbit.

For example, as shown in Figure 3. In (a) of FIG. 3 , the beam generated by a satellite (such as a LEO satellite or a GEO satellite) does not move as the satellite moves on a fixed orbit. In (b) of Fig. 3, the beam generated by the satellite will move as the satellite moves on the fixed orbit. Further, in the case where the relative distance between the satellite and the beam generated by the satellite is fixed, the variation of the path loss is small.

Since the distance between the satellite and the ground is very far (for example, the GEO satellite is 35786km), within the coverage of the same beam or cell, the difference in the propagation distance between the terminal equipment (such as UE) and the satellite in different geographic locations is small (that is, within the coverage of the same beam/cell, the difference in the path loss of signals corresponding to terminal devices in different geographic locations is small), which in turn leads to the reception quality of signals corresponding to terminal devices in different geographic locations within the coverage of the same beam ( The difference between the downlink signal reception quality of the terminal equipment or the uplink signal reception quality of the base station) is very small, as shown in (b) of FIG. 4 .

In the land network communication system shown in (a) of FIG. 4 , there are terminal devices 4201 and 4202 with different geographic locations within the coverage of the same beam/cell.

Since there is a large difference between the distance between the network device 410 and the terminal device 4201 and the distance between the network device 410 and the terminal device 4202, the signal reception quality corresponding to the terminal device 4201 is different from the signal reception quality corresponding to the terminal device 4202. There are large differences in quality. However, in the NTN communication system shown in (b) of FIG. 4 , there are terminal equipment 4401 and terminal equipment 4402 with different geographic locations within the coverage of the same beam/cell.

Since the distance from the satellite 430 to the ground is very far, there is a small difference between the distance between the satellite 430 and the terminal device 4401 and the distance between the satellite 430 and the terminal device 4402, resulting in the corresponding signal reception quality of the terminal device 4401 There is a small difference between the quality of signal reception corresponding to terminal device 4402 .

(2) Architecture of NTN communication system

The architecture of the NTN communication system in the embodiment of the present application mainly includes the NTN communication architecture with transparent satellite (transparent satellite) (i.e. adopts transparent payload) and the NTN communication architecture with regenerative satellite (regenerative satellite) (i.e. adopts regenerative payload), See Figure 5. Among them, (a) of FIG. 5 exemplifies the NTN communication architecture with transparent satellites, and FIG. 5 (b) exemplifies the NTN communication architecture with regenerative satellites.

In (a) of FIG. 5 , a satellite 510 in a transparent forwarding mode generates at least one beam 520, and the at least one beam 520 may form a cell. At this time, the terminal device 530 located in the cell can measure at least one beam of the cell, select one beam from the at least one beam according to the beam measurement result, and establish a communication connection with the satellite 510 through the selected beam.

In (b) of FIG. 5 , the satellite 540 of the regenerated signal pattern generates at least one beam 550, and the at least one beam 550 may form one cell. At this time, the terminal device 560 located in the cell can measure at least one beam of the cell, select one beam from the at least one beam according to the beam measurement result, and establish a communication connection with the satellite 540 through the selected beam.

3. Random access process

(1) 4-step random access (4-step random access) process

As shown in Figure 6, for 4-step random access, the whole process includes 4 steps: transmission of random access request message, transmission of random access response (random access response, RAR) message, transmission of message 3 (Msg3) and the transmission of message 4 (Msg4).

Step 1. Transmission of a random access request message, that is, the terminal device sends a random access request message to the network device. Wherein, the random access request message may also be called message 1 (Msg1).

Specifically, the random access request message may include a random access preamble (random access preamble, RA preamble). Among them, the main function of the RA preamble may be to request access to the network device, so that the network device can estimate and finalize based on the RA preamble The transmission delay between end devices is used to calibrate the uplink timing, and the RAR message is used to indicate to the end device.

Step 2, transmission of the RAR message, the network device receives the random access request message, and sends the RAR message to the terminal device. Wherein, the RAR message may also be called message 2 (Msg2).

Specifically, the network device sends a RAR message to the terminal device on a PDSCH (Physical Downlink Shared Channel, physical downlink shared channel) payload (payload) resource. For example, in this embodiment of the application, the RAR message is obtained by scrambling through RA-RNTI (random access radio network temporary identifier, random access radio network temporary identifier). In some embodiments, the value of the RA-RNTI is determined by the time-frequency resource location of the resource bearing the RA preamble.

For the terminal device, after the terminal device sends the RA preamble, the terminal device can listen to the PDCCH in the RAR time window according to the RA-RNTI to obtain DCI, and then the terminal device uses the RA-RNTI to parse the PDSCH payload according to the DCI to receive the corresponding RA-RNTI scrambled RAR message. If no RAR message is received within the RAR time window, it is considered that the random access procedure fails.

The RAR message may include the time adjustment required for specifying the uplink synchronization, the uplink resources required by the terminal device to send the message 3, the temporary C-RNTI, and the like.

The first two steps of the random access process, Msg1 and Msg2, mainly complete the uplink time synchronization, while the main purpose of Msg3 and Msg4 is to specify a unique and legal identity for the terminal device, C-RNTI, for subsequent data transmission.

Step 3, the transmission of the message 3, the terminal device receives the RAR message, and sends the message 3 to the network device. Among them, the message 3 is Msg3. For example, the terminal device sends Msg3 to the network device on PUSCH (Physical Uplink Share Channel, physical uplink shared channel). Further, in some embodiments, Msg3 includes the unique identifier of the terminal device. This flag can be used for conflict resolution in Step 4. For example, for a terminal device in the RRC_CONNECTED state, the unique identifier of the terminal device is C-RNTI; for another example, for a terminal device in a non-RRC_CONNECTED state, the only identifier for the terminal device is the unique terminal device identifier from the core network (eg S-TMSI or a random number).

Step 4, transmission of message 4, the network device receives Msg3, and sends message 4 to the terminal device. Wherein, message 4 may also be called Msg4.

In the conflict resolution mechanism, the network device carries the flag for uniquely identifying the terminal device in Msg4 to indicate the winning terminal device, and other terminal devices that do not win the conflict resolution will re-initiate random access. If the PDSCH received by the terminal device in Msg4 is scrambled by the TC-RNTI specified in the RAR message, when the UE Contention Resolution Identity MAC control element contained in the successfully decoded MAC PDU matches the CCCH SDU sent by Msg3, the terminal The device will consider that the random access is successful and convert its TC-RNTI into a C-RNTI.

(2) 2-step random access (2-step random access) process

Compared with the 4-step random access process, the 2-step random access process helps to reduce the access delay of the terminal device.

As shown in Figure 7, the 2-step random access process mainly includes the following two steps:

Step 1, MsgA transmission, that is, the terminal device sends the MsgA to the network device. Wherein, MsgA includes a random access request message.

In addition, MsgA also includes Msg3. The Msg3 here refers to the Msg3 in the above 4-step random access process. That is to say, MsgA includes two parts: RA preamble and PUSCH payload.

Step 2, the transmission of MsgB, that is, the network device receives MsgA and sends MsgB to the terminal device. Wherein, MsgB may also be called message B, including Msg2 and Msg4. Here, Msg2 refers to Msg2 in the above 4-step random access process, and Msg4 refers to Msg4 in the above 4-step random access process.

(3) RA preamble

1) Composition, classification and quantity of RA preamble

RA preamble can be composed of cyclic prefix (CP) and sequence (sequence).

RA preamble can support 4 long sequences with a length of 839 and 9 short sequences with a length of 139, and the length of the sequence formed by the RA preamble can be indicated by the high-level parameter prach-RootSequenceIndex.

Each cell has 64 available RA preambles, forming an RA preamble sequence, and each RA preamble has a unique index (RA preamble index) in the RA preamble sequence. Among them, the terminal device will select one (or one designated by the network device) RA preamble from the RA preamble sequence to use the physical random access channel opportunity (PRACH occasion, RO) for transmission, that is, the RA preamble is carried (or transmitted) by the PRACH occasion ).

The above RA preamble sequence can include the following two parts:

Part of it is the contention-based random access preamble (CBRA preamble) sequence and the non-contention-based random access preamble (CFRA preamble) sequence indicated by the high-level parameter totalNumberOfRA-Preambles;

The other part is other RA preamble sequences except those indicated by the high-level parameter totalNumberOfRA-Preambles. The RA preambles in the other RA preamble sequence are used for other purposes, such as requesting system information (SI).

It is worth noting that if the high-level parameter totalNumberOfRA-Preambles does not indicate the number of specific RA preambles, the above 64 RA preambles are used for contention-based random access and non-contention-based random access.

In addition, in some embodiments, CBRA preambles can be divided into two groups: group A (group A) and group B (group B). Among them, group B does not necessarily exist, and it can be configured by the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

The network device can configure the parameters required for contention-based random access through the high-level parameter RACH-ConfigCommon (carried by BWP-Common in SIB1), and the network device can configure the parameters for non-contention-based random access through the high-level parameter RACH-ConfigDedicated The parameters required for random access.

(4) PRACH time-frequency resources

In the random access process, the transmission of the PRACH message needs to use time-frequency resources, and the PRACH time-frequency resources are divided to obtain at least one physical random access channel opportunity (PRACH occasion, RO). Wherein, the RO is used to transmit or carry a random access request message. ROs may include time domain resources and frequency domain resources. Specifically, the time-domain resource may be indicated by an index of the time-domain resource, and the frequency-domain resource may be indicated by an index of the frequency-domain resource.

The time domain location or time domain resource of RO, that is, the PRACH time domain resource used to transmit/carry RA premble/Msg1, the network device can be configured to the terminal device through the parameter prach-ConfigurationIndex in the high-level parameter RACH-ConfigGeneric, such as specific configuration The method can be seen in Table 1.

Table 1 defines random access configurations for FR1 and paired spectrum/supplementary uplink. Among them, n _f represents the system frame number, x represents the PRACH configuration cycle, The number of ROs in a PRACH slot, Indicates the time-domain symbol length of an RO.

Table 1

For example, when the PRACH Configuration Index is 109, the following exists:

The random access preamble format adopts A1/B1;

· Every two system frames (ie the system frame index is an even number 0, 2, 4...) contain RO time domain resources (ie n _f mod 2 = 0);

The starting position of the time domain resources of the RO is under the 4th subframe in the system frame, starting from the 0th OFDM symbol;

There are 2 PRACH slots in the 4th subframe, and there are 7 PRACH slots in each PRACH slot A time-domain resource index of an RO;

The time-domain symbol length of RO is 2 That is, it occupies 2 OFDM symbols.

It should be noted that, in this embodiment of the application, the time domain resources identified by the indexes of two adjacent time domain resources may be continuous or discontinuous, for example, the index of the time domain resources is index 0 In the case of and index 1, the time domain resource identified by index 0 is the 0th to 1st OFDM symbols under the 4th subframe in the system frame, and the time domain resource identified by index 1 is the 4th subframe in the system frame The 2nd to 3rd OFDM symbols under the frame.

The parameter msg1-FrequencyStart in the high-level parameter RACH-ConfigGeneric can be used to configure the offset from the initial frequency domain resource position of the RO to the initial BWP (intial BWP) or the current active BWP (active BWP) initial frequency domain resource position ( offset);

The parameter msg1-FDM in the high-level parameter RACH-ConfigGeneric can be used to configure the number of frequency domain resource indexes of the RO.

(5) Synchronization Signal and PBCH block (SSB) corresponding (mapping/association) beam

In the 5G NR communication system, the frequency of the cell increases, and the coverage decreases accordingly. In order to increase the coverage of the cell, when sending some broadcast information, the form of coverage can no longer be used, but the form of beam sweeping (beam sweeping) can be used.

Beam scanning is to concentrate energy in a certain direction at a certain moment, and this direction can send the signal farther, but the signal cannot be received in other directions; then, send it in another direction at the next moment; finally, through Continuously change the beam direction to achieve the coverage of the entire cell.

In 5G NR, beams are used in the random access process, and SSB has multiple transmission opportunities in the time domain period, and has a corresponding index (index), that is, SSB index.

Each beam may correspond to (map/associate) at least one SSB index, and beams corresponding to different SSB indices may be the same (in the same direction) or different (in different directions).

SSB is in units of half frame 5ms, which is an SS burst set. All SSBs in an SS burst set must be sent periodically in the same half frame. SSBs appear several times in a certain half-frame at intervals, and each of these several SSBs corresponds to a beam scanning direction, and finally there will be one SSB in each direction.

For terminal devices, when the beam scanning signal of SSB covers the terminal device, the terminal device has the opportunity to send RA preamble, that is, beam corresponding (association/mapping) RA preamble. At this time, if the network device receives the RA preamble from the terminal device, the network device can know the best downlink beam or the best downlink beam. That is to say, the network device knows which beam points to the terminal device.

Since the beam corresponds to the RA preamble, and the beam corresponds to the SSB, the SSB needs to correspond (associate/map) to the RA preamble. In addition, since the RA preamble needs to be sent based on the RO, that is, the RA preamble needs to be carried (or transmitted) by the RO, the SSB needs to be associated (mapped/corresponded) with the RO so that the network device knows which beam to send Msg2 to the terminal device.

(6) SSB association (mapping/correspondence, etc.) RO and SSB association (mapping/correspondence, etc.) RA preamble

The network device can configure N (where N is configured by the L1 parameter SSB-per-rach-occasion) SSB association (mapping/corresponding) to a RO (N≥1) for the terminal device through the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB , or the network device configures an SSB association (mapping/corresponding) 1/N (where N is configured by the L1 parameter SSB-per-rach-occasion) RO(N <1), and each SSB is associated (mapped/corresponded) R (where R is configured by the L1 parameter CB-preambles-per-SSB) RA preamble index.

For example, the value of N may be {1/8, 1/4, 1/2, 1, 2, 4, 8, 16}.

There are two configurations for N:

One is, N<1, in this case, one SSB can be associated with 1/N valid ROs. Wherein, the preamble associated with the SSB starts from RA preamble index 0.

For example, if N=1/8, one SSB is associated with 8 ROs, and the preamble index of the starting point of the 8 ROs is 0.

The other is that N≥1, in this case, N SSBs are associated with one RO. For example, SSB n can select one of the R preambles to send Msg1, 0≤n≤N-1, n refers to the SSB index, and the preamble associated with the SSB n is from the RA preamble index as start. in, It is configured by the high-level parameter totalNumberOfRA-Preambles and is an integer multiple of N.

For example, with N=2, as an example. In this case, two SSBs are associated with one RO, the RA preamble index associated with SSB0 starts from 0, and the RA preamble index associated with SSB1 starts from 32. That is to say, SSB0 is associated with RA preambles whose index is 0-31, and SSB1 is associated with RA preambles whose index is 32-(the total number of corresponding RA preambles-1).

It should be noted that for effective ROs, relevant descriptions can be found in 3GPP standards. It can be understood that, for FDD (Frequency Division Duplexing, frequency division duplexing) mode or paired spectrum (paired spectrum), all ROs are valid. .

For TDD (Time Division Duplexing, time division duplex) mode or unpaired spectrum (unpaired spectrum), if the network side does not configure high-level parameters (such as tdd-UL-DL-ConfigurationCommon), and at the same time, the time domain resource location of the RO is in the SSB After the symbol position, and at least N _gap symbols away from the symbol position of the last SSB received by the terminal device, the RO is valid, that is, a valid RO. Wherein, the relationship between N _gap and RA preamble subcarrier spacing can be shown in Table 2.

If the network side configures high-level parameters (such as tdd-UL-DL-ConfigurationCommon), configure the RO in the uplink resource, and the time domain resource position of the RO is after the symbol position of the SSB, and is the same as the last If the symbol positions where the SSB is located are at least N _gap symbols apart, then the RO is valid, that is, a valid RO.

Table 2

In Table 2, for the RA preamble sequence whose subcarrier spacing (SCS) is 1.25kHz/5kHz, the value of N _gap is 0; for the RA preamble sequence whose subcarrier spacing (SCS) is 15kHz/30kHz/60kHz/120kHz, The value of N _gap is 2.

To sum up, the mapping relationship between SSB and RO can be mapped in the following order:

First, the order of RA preamble indexes in an RO is increasing;

Secondly, the frequency domain resource index (frequency resource index) order of the frequency multiplexed RO (frequency multiplexed) RO is descending increased;

Again, the order of the time domain resource index (time resource index) of the time division multiplexed (time multiplexed) RO in a PRACH slot is increasing;

Finally, the order of the PRACH slot index is increasing.

The above-mentioned "mapping relationship between SSB and RO" is illustrated below with an example.

Example 1:

Take 8 SSBs configured in a cell, their respective indexes are 0-7, the parameter msg1-FDM=4, and the parameter ssb-perRACH-Occasion=1/4 as an example. In this case, the mapping relationship between SSB and RO is shown in FIG. 8 .

In Figure 8, the parameter msg1-FDM=4 indicates that on one time domain resource of the RO, the frequency domain resource indexes of the RO are index 0, index 1, index 2, and index 3.

The parameter ssb-perRACH-Occasion=1/4 (that is, N=1/4) indicates that one SSB is mapped to four ROs.

Therefore, according to the increasing order of the frequency domain resource index, SSB 0 is mapped to four ROs in turn, that is, the index of the time domain resource of the RO is index 0, and the index of the frequency domain resource is index 0, index 1, index 2 , in the RO of index 3.

Since the number of SSBs is 8, the SSBs have not been mapped yet. Therefore, according to the above-mentioned "mapping principle", SSB 1 is mapped to four ROs in sequence according to the increasing order of the index of the frequency domain resources, that is, the time of the ROs. When the index of the domain resource is index 1, the frequency domain resource indexes are in the ROs of index 0, index 1, index 2, and index 3, and so on.

Example two:

Take 8 SSBs configured in a cell, their respective indexes are 0-7, the parameter msg1-FDM=4, and the parameter ssb-perRACH-Occasion=1 as an example. In this case, the mapping relationship between SSB and RO is shown in Figure 9.

In Figure 9, the parameter msg1-FDM=4 indicates that on one time domain resource of the RO, the frequency domain resource indexes of the RO are index 0, index 1, index 2, and index 3.

The parameter ssb-perRACH-Occasion=1 indicates that one SSB is mapped to one RO. Therefore, according to the increasing order of the frequency domain resource index, map SSB 0~3 to the RO whose time domain resource index is index 0, and the frequency domain resource index is index 0, index 1, index 2, index 3 in RO, That is, when SSB 0 maps the time-domain resource index of the RO to index 0, the frequency-domain resource index is to the RO of index 0, and so on.

Since the number of SSBs is 8, the SSBs have not been mapped at this time. Therefore, according to the above-mentioned "mapping principle", SSBs 4 to 7 are mapped to the time-domain resource index of the RO in order of increasing frequency-domain resource index as index 2. And the frequency domain resource index is in the RO of index 0, index 1, index 2, index 3, and so on.

Example three:

Take 8 SSBs configured in a cell, their respective indexes are 0-7, the parameter msg1-FDM=4, and the parameter ssb-perRACH-Occasion=2 as an example. In this case, the mapping relationship between SSB and RO is shown in Figure 10.

In Figure 10, the parameter msg1-FDM=4 indicates that on one time domain resource of the RO, the frequency domain resource indexes of the RO are index 0, index 1, index 2, and index 3.

The parameter ssb-perRACH-Occasion=2 indicates that 2 SSBs are mapped to 1 RO.

The specific mapping is as follows:

SSB 0/1 maps the time domain resource index of RO to index 0, and the index of the frequency domain resource is index 0 on the RO, SSB 2/3 maps the index of the time domain resource of the RO to index 0, and the frequency domain resource index is On the RO with index 1, SSB 4/5 maps the index of the time domain resource of the RO to index 0, and on the RO with the index of the frequency domain resource at index 2, the index of the time domain resource mapped to the RO by SSB 6/7 is index 0, and the index of the frequency domain resource is on the RO of index 3.

The rest can be deduced in the same way.

(7) CSI-RS association (or mapping) RO

CSI-RS is similar to SSB, and the CSI-RS ID has a corresponding relationship with the beam. If the random access process is triggered by a high-level request, and the CSI-RS index is associated with the RO, then if the parameter ra-PreambleIndex is not 0, the parameter ra-OccasionList indicates the RO set associated with the CSI-RS Index.

(8) Transmission of Msg1

During the random access process, the terminal device can use the RO to transmit (carry) Msg1. Among them, there are the following three ways to trigger the random access process:

PDCCH order triggering: The network device notifies the terminal device through a special DCI format 1_0 that it needs to initiate a random access process, and notifies the terminal device of the ra-PreambleIndex, SSB Index, PRACH Mask Index and the UL/SUL Indicator indicating whether UL or SUL should be used .

●MAC layer trigger: The terminal device selects RA preamble to initiate the random access process.

● RRC layer triggers: such as initial access, re-establishment, handover, transition from RRC_INACTIVE to RRC_CONNECTED state, request for other SI, RRC request during synchronous reconfiguration, etc.

When the terminal device wants to transmit Msg1, it needs to perform the following operations:

1) Select SSB or CSI-RS

It should be noted that the value range of the RA preamble index has an association (mapping/corresponding) relationship with the SSB index or the CSI-RS index, and the SSB index or the CSI-RS index has a mapping relationship with the RO.

① Select SSB

The terminal device can obtain the SS-RSRP of the SSB through channel estimation, and then compare the SS-RSRP of the SSB with the parameter rsrp-ThresholdSSB. If there is an SSB whose SS-RSRP is greater than the parameter rsrp-ThresholdSSB, the terminal device selects the SSB; otherwise, the terminal device selects an SSB arbitrarily.

If the SS-RSRP of multiple SSBs is greater than the parameter rsrp-ThresholdSSB, the terminal device randomly selects one SSB from the multiple SSBs.

The foregoing is only an illustration of a strategy for selecting an SSB, and this embodiment of the present application does not limit the strategy for selecting an SSB.

②Choose CSI-RS

When selecting a CSI-RS, compare the CSI-RSRP of the CSI-RS with the parameter rsrp-ThresholdCSI-RS. If there is a CSI-RS whose CSI-RSRP is greater than the parameter rsrp-ThresholdCSI-RS, the terminal device selects the CSI-RS. RS.

2) Select RA preamble index

The RA preamble index can be selected by the terminal device or indicated by the network device.

3) Select the PRACH resource used to carry (transmit) the RA preamble

4) Determine the corresponding RA-RNTI

The time-frequency resource location of the RO determines the RA-RNTI value. After transmitting the RA preamble, the terminal device will calculate the RA-RNTI according to the time-frequency resource position of the RO in order to receive the RAR scrambled by the RA-RNTI. non-contention random access preamble):

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

Among them, s_id is the index of the first OFDM symbol of the RO (0≤s_id<14), t_id is the index of the first slot of the RO in the system frame (0≤t_id<80), f_id is the RO in the frequency domain The index of (0≤f_id<8), ul_carrier_id is the UL carrier used for RA preamble transmission (0 means normal uplink carrier, 1 means SUL carrier).

5) Determine the target receiving power of RA preamble

4. A communication method

The 3GPP standard usually assumes that the antenna gain of the terminal equipment in the NTN communication system is 0dBi, but in the actual communication process, the antenna gain of the terminal equipment often cannot meet the above requirements. Since the antenna gain of the terminal device cannot meet the requirement, when the terminal device performs random access, the network device may not successfully receive the random access request message (such as message 1 or Msg1 ) sent by the terminal device. For this, it is necessary to enhance the coverage under the NTN communication system to ensure the successful transmission of the random access request message.

Based on this, the embodiment of the present application introduces indication information, so that the network device can indicate to the terminal device the number of repetitions (repetition) of the random access request message configured for the SSB index or SSB through the indication information, and then the terminal device can according to the selected The number of repetitions of the random access request message corresponding to the SSB, and the random access request message is sent to the network device multiple times (or repeatedly), thus helping to achieve coverage enhancement, improve the transmission reliability of the random access request message, and improve the terminal Probability of device random access success.

The specific implementation is as follows:

●For network equipment

The network device may send indication information, and the indication information may be used to indicate the repetition times of the random access request message, and the repetition times of the random access request message correspond to (associate or map) the SSB index.

It should be noted that, in this embodiment of the application, the indication information may be used to indicate the number of repetitions of the random access request message, and may be replaced by the following description, the indication information may be used to configure the number of repetitions of the random access request message .

●For terminal equipment

The terminal device may receive the indication information, and send a random access request message according to the number of repetitions of the random access request message.

The following takes the random access request message as Msg1 as an example for specific description.

It should be noted that the number of repetitions of Msg1 configured by the network device for different SSB indexes can be different, because:

In the same cell, due to the different antenna elevation angles corresponding to different beams, the distance between the coverage area of different beams and the satellite is also different, so the signal strength of different beams is also different, for example, the signal at the center of satellite coverage The strength is greater than the signal strength of the edge portion. Since beams are used for random access, when a terminal device performs random access in coverage areas of different beams, the required number of repetitions of Msg1 may be different.

Since each beam can correspond to at least one SSB, the network device can configure the repetition times of Msg1 for the SSB index (index) in the cell. The repetition times of Msg1 configured for the SSB index corresponding to the beam may be used in the random access process. It can also be understood that the SSB index in the cell corresponds to the number of repetitions of Msg1.

In the case that the beam scanning signal of the SSB covers the terminal device, the terminal device may have an opportunity to send Msg1. Since the SSB associated with the beam corresponds to the number of repetitions of Msg1, the terminal device can transmit according to the number of repetitions of Msg1 corresponding to the selected SSB, which is beneficial to achieve coverage enhancement.

Further, since the beam corresponds to the RA preamble, and the beam corresponds to the SSB, the SSB needs to correspond to the RA preamble. In addition, since the RA preamble needs to be carried (or transmitted) by the RO, the SSB corresponding to the number of repetitions of Msg1 needs to be associated with the RO.

In addition, in some embodiments, the network device selects the value of the repetition number of Msg1 configured for the SSB index from the candidate value set of the repetition number of Msg1 .

Wherein, the number of repetitions of Msg1 corresponding to different SSB indexes may be different or the same, which is mainly determined by the specific implementation of the network device. In some embodiments of the present application, the SSBs of the SSB indexes corresponding to the repetition times of the same Msg1 belong to one SSB group. That is to say, the number of repetitions of Msg1 corresponding to each SSB index belonging to the same SSB group is the same.

In order to realize the above-mentioned technical solution, other contents, concepts and meanings that may be involved will be further explained below.

(1) Number of repetitions of the random access request message

It should be noted that the number of repetitions of the random access request message may be used to indicate the number of times (or repetitions) of the random access request message being transmitted multiple times. For example, the number of repetitions for Msg1.

(2) The first community

The first cell in this embodiment of the present application may be a cell where the terminal device resides, may be a cell selected by the terminal device in cell search, or may be a serving cell of the terminal device, etc., and there is no specific limitation on this.

In some possible implementations, the first cell may be a serving cell of the terminal device.

For example, for a terminal device in a connected state, an idle state or an inactive state, the first cell is a serving cell of the terminal device.

In some possible implementations, the first cell may be a cell where the terminal device resides.

For example, for a terminal device that initially accesses the network or a terminal device that accesses the network for the first time, the first cell is the cell where the terminal device resides. It should be noted that, in the embodiment of the present application, the terminal device initially accesses the network, and the cell where the terminal resides may also be understood as the serving cell of the terminal device.

For example, in response to turning off the airplane mode or turning on the device, the terminal device initiates a process of initially accessing the network to the network device.

It should be noted that the first cell refers to a cell used to provide services for terminal devices, and may also be a cell used for terminal devices to access the network, etc., and may also be described by other terms, such as target cells, etc., only with the same The meaning/function/interpretation are all within the scope of protection claimed by the embodiments of the present application.

(3) Instructions

In order to indicate to the terminal device that the network device configures the number of repetitions of Msg1 for the SSB index in the first cell, the embodiment of the present application introduces indication information, and the network device indicates or configures the number of repetitions of Msg1 for the terminal device through the indication information.

It should be noted that the correspondence between the number of repetitions of Msg1 and the SSB index may be configured by the network, may be pre-configured, may be stipulated by a protocol, and may be explicitly or implicitly indicated, and there is no specific limitation on this.

For example, the network device may directly indicate the corresponding relationship to the terminal device.

For another example, the network device may indicate the number of repetitions of Msg1 in the order of the SSB index indicated to the terminal device, so as to implicitly indicate the corresponding relationship to the terminal device, which helps to reduce signaling overhead. For example, the network device instructs the terminal devices SSB0 , SSB1 and SSB2 in sequence, and the repeat times of Msg1 indicated sequentially through the indication information are 1, 2 and 3. At this time, the repetition count of Msg1 corresponding to SSB0 is 1, the repetition count of Msg1 corresponding to SSB1 is 2, and the repetition count of Msg1 corresponding to SSB2 is 3.

In addition, the indication information may also be described in other terms, such as first information, configuration information, etc., as long as they have the same meaning/function/interpretation, they are all within the scope of protection claimed in the embodiments of the present application.

In some possible implementations, the indication information may be sent or received during cell search, cell reselection, uplink and downlink synchronization, cell access, cell camping, initial access, or uplink and downlink resource scheduling.

In some possible implementations, the indication information may be carried by system information (SI), high-level signaling (such as RRC signaling), terminal equipment-specific signaling, and the like.

For example, the network device may broadcast system information, and the system information carries the indication information, so as to configure the number of repetitions of Msg1 through broadcasting.

(4) SSB index and SSB group

In the embodiment of this application, the SSB index may be indicated by the network device to the terminal device through system information or high-level parameters, so as to realize The current network device configures SSB for the terminal device. For example, the network device may indicate the SSB index for the terminal device in processes such as cell search, cell reselection, uplink and downlink synchronization, cell access, cell camping, initial access, or uplink and downlink resource scheduling.

For example, the network device may indicate to the terminal device the SSB indexes of the multiple SSBs in the first cell through system information or high-layer parameters.

For example, during the cell search process, the network device indicates the position of the first cell to the terminal device through SIB1 or ssb-PositionsInBurst in the high layer parameter ServingCellConfigCommon. The SSB index of each SSB, so as to realize the configuration of the SSB of the terminal device.

Further, in some embodiments, the network device in this embodiment of the present application may configure the repetition times of Msg1 corresponding to the SSB for the terminal device according to the SSB group. For example, the indication information indicates P0, P0 is a positive integer greater than or equal to 1, P0 corresponds to SSB group 1, and SSB group 1 includes SSB1, SSB2 and SSB3, then the repetition times of Msg1 corresponding to SSB1, SSB2 and SSB3 are all P0, in In this case, P0 corresponds to the number of repetitions of Msg1 of SSB1, SSB2 and SSB3. In this way, it helps to save signaling overhead. It should be noted that, in this embodiment of the present application, the numbers of SSBs in different SSB groups may be the same or different, and this is not limited.

(5) K _i and K _j

Certainly, in the embodiment of the present application, the repetition times of Msg1 corresponding to the SSB may also be configured for the terminal device according to the SSB. For example, the indication information indicates P1 and P2, P1 corresponds to SSB1, and P2 corresponds to SSB2. In this case, the number of repetitions of Msg1 corresponding to SSB1 is P1, and the number of repetitions of Msg1 corresponding to the SSB index of SSB2 is P2, where P1 and P2 may be the same or different. Both P1 and P2 are positive integers greater than or equal to 1. It should be understood that, in this embodiment of the present application, the indication information may only indicate the number of repetitions of one Msg1, or may indicate the number of repetitions of multiple Msg1s, which is not limited.

For another example, the indication information is used to indicate K _i , where K _i is the number of repetitions of Msg1 corresponding to SSB index i, where the SSB identified by SSB index i is the SSB in the first cell, 1≤i≤M, and i is A positive integer, M is the total number of SSBs in the first cell. For another example, the indication information is used to indicate K _i and K _j , for K _i , reference may be made to the relevant introduction above, and details are not repeated here. K _j is the number of repetitions of Msg1 corresponding to SSB index j, where the SSB identified by SSB index j is the SSB in the first cell, and the SSB identified by SSB index j is different from the SSB identified by SSS index i, that is j and i are different values. 1≤j≤M, j is a positive integer.

Further, in some embodiments, the repetition times of Msg1 corresponding to different SSB indexes are different. Take SSB index i and SSB index j as an example. SSB index i corresponds to K _i , SSB index j corresponds to K _j , and when the repetition times of Msg1 corresponding to different SSB indexes are different, K _i and K _j are different. Alternatively, the repetition times of Msg1 corresponding to SSBs corresponding to different beams are different. Take SSB index i and SSB index j as an example. SSB index i corresponds to K _i , and SSB index j corresponds to K _j . If the beam corresponding to the SSB identified by the SSB index i is different from the beam corresponding to the SSB identified by the SSB index j, K _i and K _j are different. In some embodiments, if the beam corresponding to the SSB identified by the SSB index i is the same as the beam corresponding to the SSB identified by the SSB index j, then K _i and K _j may be different or the same.

In some other embodiments of the present application, the network device may select from the set of candidate values of the repetition number of Msg1 to indicate the repetition number of Msg1 corresponding to the SSB index for the terminal device. The set of candidate values for the number of repetitions of Msg1 may be predefined by a protocol, determined by a network device based on a certain algorithm or policy, or instructed by other devices or servers, which is not limited. Exemplarily, the repetition count candidate value set of Msg1 may include at least one candidate value. For example, each candidate value is a power of 2. In this case, the set of candidate values for the number of repetitions of Msg1 is set {1, 2, 4, 8, 16, . . . , 2 ⁿ }. For example, the value of n may be predefined, may be predefined by a protocol, may be determined by a network device based on a certain algorithm or policy, or may be instructed by other devices or servers, and there is no specific limitation on this.

For example, take SSB index i as an example. The SSB index i corresponds to K _i , where K _i =2 ^a , and a is a positive integer greater than or equal to 0.

Or, in still some embodiments of the present application, the repetition times of Msg1 corresponding to the SSB index is a power of 2. For example, take SSB index i as an example. The SSB index i corresponds to K _i , where K _i =2 ^a , and a is a positive integer greater than or equal to 0. For another example, take the SSB index j as an example. The SSB index j corresponds to K _j , K _j =2 ^b , and b is a positive integer greater than or equal to 0.

(6) PRACH time-frequency resources

To perform random access, the terminal device needs to use corresponding PRACH time-frequency resources, and divide the PRACH time-frequency resources to obtain at least one RO. Wherein, the RO is used to transmit or carry a random access request message. The RO includes time domain resources and frequency domain resources. Specifically, the time-domain resource may be indicated by an index of the time-domain resource, and the frequency-domain resource may be indicated by an index of the frequency-domain resource.

The PRACH time-frequency resource may be configured by the network device to the terminal device through high-layer parameters. For example, the network device may be configured to the terminal device during cell search, cell reselection, uplink and downlink synchronization, cell access, cell camping, initial access, or uplink and downlink resource scheduling.

For example, in combination with the content in the above "(4) PRACH time-frequency resource", in the embodiment of this application, the network device can configure the time domain position or time domain resource of the RO through the parameter prach-ConfigurationIndex in the high layer parameter RACH-ConfigGeneric , and configure the frequency domain bit of the RO through the parameter msg1-FrequencyStart and the parameter msg1-FDM in the high-level parameter RACH-ConfigGeneric The number of frequency-domain resource indexes of configuration or RO, so as to realize the configuration of PRACH time-frequency resources.

(7) Mapping relationship between SSB index and RO

In the existing 3GPP standard, the mapping relationship between SSB and RO cannot be applied to the situation of multiple (or repeated) transmission of Msg1. If the terminal device needs to transmit the Msg1 multiple times (or repeatedly), the standard protocol specified by the existing 3GPP will no longer be applicable. Therefore, the embodiment of the present application needs to re-study the mapping relationship between the SSB index corresponding to the repetition number of Msg1 and the RO.

Based on this, in the embodiment of the present application, when the SSB index and the RO are mapped, the specific implementation can be as follows:

◆ Determine the mapping order of the SSB index mapping RO in the first cell.

The network device may indicate (configure) the SSBs of the first cell to the terminal device, for example, indicate M SSBs of the first cell to the terminal device. In the embodiment of the present application, the terminal device may sequentially map the ROs corresponding to the SSB according to the following mapping sequence.

For example, the mapping order can be as follows:

◆One is: sort in descending order according to the repetition times of Msg1 corresponding to the SSB indexes, and sort in ascending order by the SSB indexes with the same repetition times.

For example, the network device indicates to the terminal device the repetition times (K _i ), for example, the correspondence between the SSB index and the number of repetitions of Msg1 is That is, the repetition times of Msg1 corresponding to SSB0 is 8, the repetition times of Msg1 corresponding to SSB1 is 2, and so on.

Then, sort in descending order according to the number of repetitions of Msg1 corresponding to the SSB index, wherein, for SSB indexes with the same number of repetitions of Msg1, sort them in ascending order according to the SSB index, and the correspondence between the reordered SSB index and the number of repetitions of Msg1 relationship is Therefore, when mapping, the mapping order is: SSB0→SSB4→SSB5→SSB1→SSB2→SSB3.

◆The other is: sort in ascending order according to the repetition times of Msg1 corresponding to the respective SSB indexes, wherein the SSB indexes with the same repetition times are sorted in ascending order.

◆Another method is: sort in descending order according to the repetition times of Msg1 corresponding to the SSB indexes, wherein the SSB indexes with the same repetition times are sorted in descending order.

◆Another one is: sorting in ascending order according to the repetition times of Msg1 corresponding to the SSB indexes, wherein the SSB indexes with the same repetition times are sorting in descending order.

In addition, in this embodiment of the present application, ROs corresponding to SSBs may be sequentially mapped using SSB groups as a granularity. Specifically, the mapping order can be as follows:

◆One is: sort in descending order according to the repetition times of Msg1 corresponding to each SSB group, and sort in ascending order by the SSB indexes in the same SSB group.

◆The other is: sort in descending order according to the number of repetitions of Msg1 corresponding to each SSB group, and sort in descending order the SSB indexes in the same SSB group.

◆Another one is: sorting in ascending order according to the repetition times of Msg1 corresponding to each SSB group, and sorting in ascending order according to the SSB indexes in the same SSB group.

◆Another one is: sorting in ascending order according to the repetition times of Msg1 corresponding to each SSB group, and sorting in descending order by the SSB indexes in the same SSB group.

etc.

◆ Divide the time-domain resource index of the RO with the maximum value of the repetition times of Msg1 corresponding to the SSB indexes in the first cell as the granularity, and obtain the RO group. In other words, the RO group includes K ROs in the time domain, and K is the maximum value among the repetition times of at least one Msg1 indicated by the network device to the terminal device.

The embodiment of the present application needs to divide the time-domain resource index of the RO in the PRACH time-frequency resource.

Take the time-domain resource index of multiple ROs that the network device can indicate to the terminal device through the high-layer parameter prach-ConfigurationIndex as an example. When the maximum value of the repetition times of Msg1 corresponding to the SSB index in the first cell is K, the RO group is obtained by sequentially dividing the time-domain resource indexes of the K ROs, so as to sequentially map the SSB index in the RO group. For example, taking the maximum value of the repetition times of Msg1 corresponding to the SSB index in the first cell as K=8, the time domain resource indexes of the ROs in the first RO group are index 0, index 1, index 2, index 3. index 4, index 5, index 6, index 7, the time domain resource indexes of ROs in the second RO group are index 8, index 9, index 10, index 11, index 12, index 13, index 14, index 15 ,And so on.

The network device can indicate the number of frequency domain resource indexes of the RO to the terminal device through the parameter msg1-FDM in the high layer parameter RACH-ConfigGeneric. For example, the parameter msg1-FDM=4 indicates that on one time domain resource of RO, the frequency domain resource index of RO is index 0, index 1, index 2, index 3.

◆The mapping relationship between the SSB index in the first cell and the RO can be determined by high-layer parameters.

It should be noted that, combined with the content in the above "(6) SSB association (mapping/correspondence, etc.) RO and SSB association (mapping/correspondence, etc.) RA preamble", it can be seen that the upper layer can pass the upper layer parameter (for example, the higher layer parameter is ssb- perRACH-OccasionAndCB-PreamblesPerSSB) to configure N (for example, N is configured by the L1 parameter SSB-per-rach-occasion) SSBs are associated (mapped/corresponded) to an RO, and each SSB in the N SSBs is associated (mapped/ Corresponding) R (for example, R is configured by the L1 parameter CB-preambles-per-SSB) RA preamble index.

Wherein, the N SSBs are selected from SSBs in the first cell.

In some possible implementations, the value of N may be one of 1/8, 1/4, 1/2, 1, 2, 4, 8, and 16.

If N<1, it means that one SSB can be mapped to N ROs; if N=1, it means that one SSB can be mapped in one RO; if N>1, it means that one RO can be mapped to at most N SSBs.

Exemplarily, when N>1, the mapping rule of the SSB index is as follows.

In some possible implementations, when N>1, the N SSBs mapped to the same RO are distinguished by the RA preamble index. Among them, the following mapping rules can exist:

◆Using T as the number of time-domain resource indexes of ROs, that is, the time-domain resource indexes of T ROs in the RO group, T is the maximum value among the repetition times of Msg1 corresponding to each of the N SSB indexes, and the N The SSB is mapped according to the time-domain resource indexes of the T ROs.

If there is one SSB index among the N SSB indexes mapped by the RO in the time domain resource index of the T ROs, then the RA preamble index associated with the one SSB mapped by the RO starts from 0;

If there are two SSB indexes among the N SSB indexes mapped by ROs in the time domain resource indexes of the T ROs, then the two SSBs mapped by the ROs are distinguished by RA preamble index;

If there are ROs mapped to S (2≤S≤N) SSB indexes among the N SSB indexes in the time domain resource indexes of the T ROs, then the S SSBs mapped to the RO are distinguished by RA preamble index .

To sum up, the ROs mapped to each of the N SSB indexes are the same or/or different.

If the N SSB indexes map to the same RO, then the N SSB indexes are distinguished by the RA preamble index in the same (same) RO.

For example, when N=2, it means that 2 SSBs are mapped to 1 RO. If SSB0 and SSB1 need to be mapped to the same RO, and the number of repetitions of Msg1 corresponding to SSB0 is 8, and the number of repetitions of Msg1 corresponding to SSB1 is 4, then 8 is used as the number of time domain resource indexes of the RO, that is, in the RO group The time-domain resource indexes of the eight ROs, and the two SSBs are mapped according to the time-domain resource indexes of the eight ROs.

The first 4 ROs in the time domain resource index of the 8 ROs are all mapped to SSB0 and SSB1, and are distinguished by RA preamble index, while the last 4 ROs only map to SSB0, and the SSB0 associated with the last 4 ROs are mapped RA preamble index starts from 0.

◆SSB index, mapping RO according to the increasing order (ascending order) of RA preamble index.

It can be understood that the mapping relationship between SSB and RO can follow the following: the order of RA preamble index in an RO is increasing, and the SSB is mapped according to the increasing order (ascending order) of RA preamble index in RO.

◆The SSB index is mapped to the RO, and the mapping is carried out according to the granularity of the RO group. The RO group includes K ROs in the time domain, and K is the maximum value among the repetition times of Msg1. First, on the RO group whose time domain resource index is index 0 to K-1 and the frequency domain resource index is the smallest, map in the RO group sequentially according to the order of the time domain resource index from small to large. Next, after the time-domain resource index is index 0-K-1, and the RO group with the smallest frequency-domain resource index has been mapped, add the frequency-domain resource index and/or the time-domain resource index to obtain the next RO group, Then continue to map in the RO group sequentially according to the order of the time domain resource index from small to large, and so on. The number of repetitions of Msg1 corresponding to the SSB index is packaged and mapped in the time domain.

For example, the number of repetitions of Msg1 corresponding to SSB0 is 8. When N=1/2, it means that one SSB is mapped to two ROs. The parameter msg1-FDM=4 means that on one time domain resource of RO, the The frequency domain resource indexes are index 0, index 1, index 2, and index 3. First, on the RO group whose time domain resource index is index 0-7 and the frequency domain resource index is the smallest, that is, on the RO group whose frequency domain resource index is index 0, map the SSB0 corresponding to the time domain resource index in ascending order. the RO. After all the ROs in the RO group with the smallest frequency domain resource index are mapped, increase the frequency domain resource index to obtain the RO group with the frequency domain resource index index 1, and then map SSB0 in sequence according to the order of the time domain resource index from small to large For the corresponding RO, after the mapping of the RO corresponding to SSB0 is completed, if all the RO groups whose frequency domain resource index is index1 are mapped, continue to increase the frequency domain resource index.

It can be understood that, in this embodiment of the present application, the mapping between the SSB index and the RO is sequentially performed with the RO group as the granularity.

(8) Send Msg1

It should be noted that in this embodiment of the present application, Msg1 may be sent according to the number of repetitions of Msg1, so as to achieve coverage enhancement.

The configuration of K _i from the network device to the terminal device is taken as an example for specific description below.

During specific implementation, the terminal device may send Msg1 according to K _i .

In addition, because Msg1 needs to be carried (or transmitted) by ROs, in order to realize repeated sending of Msg1, the embodiment of the present application also needs to determine multiple ROs according to K _i , and send Msg1 through at least one RO in the multiple ROs to realize Msg1 Multiple (or repeated) transmissions.

For example, according to K _i , determine M _i ROs, K _i ≤ M _i ≤ K _i *L; where, L=N, N>1; or, L=1/N, N≤1; N can be used to indicate The mapping relationship between SSB and RO indicated by SSB index i; select K _i ROs from M _i ROs, and send Msg1.

It should be noted that, in combination with the content in the above "(7) Mapping relationship between SSB index and RO", N can be configured by a high-level parameter (for example, the high-level parameter is configured by the L1 parameter SSB-per-rach-occasion).

In some embodiments, the terminal device may determine Mi ROs according to Ki in the following manner:

◆If K _i =K, and N≤1, then M _i ROs are divided into 1/N RO groups, and RO groups include K ROs in the time domain, and K can be the random access request message indicated by the indication information The maximum number of repetitions.

It should be noted that the RO group includes the ROs where the time domain resources identified by the time domain resource indexes of the K ROs are located. That is, the RO group includes K ROs in the time domain.

In addition, K _i =K, which means that the number of repetitions of Msg1 corresponding to the SSB index i (that is, K _i ) is the maximum value. In addition, N≤1 means that one SSB can map N ROs. Since the embodiment of the present application needs to divide the time-domain resource index of the RO at the granularity of the maximum value of the repetition times of Msg1 corresponding to the SSB indexes in the first cell, the embodiment of the present _application can determine 1/ There are N RO groups, and each RO group includes K ROs in the time domain, so one RO group is selected from the 1/N RO groups to obtain K ROs, so as to transmit Msg1 multiple times (or repeatedly).

◆If N>1, or if N≤1 and K _i /N≤K, then M _i ROs are located in the same RO group, and the RO group includes K ROs in the time domain, and K is the random access request indicated by the indication information The maximum number of repetitions for the message.

It should be noted that the RO group includes time-domain resource indexes of K ROs. That is, the RO group includes K ROs in the time domain. The RO includes time domain resources and frequency domain resources, the time domain resources can be indicated by the time domain resource index, and the frequency domain resources can be indicated by the frequency domain resource index.

In addition, N>1 means that one RO can map N SSBs. At this time, in the embodiment of the present application, the M _i ROs determined according to K _i are located in the same RO group, so that K _i ROs are selected from the same RO group, so as to transmit Msg1 multiple times (or repeatedly). Wherein, the RO group divides the time-domain resource indexes of the ROs according to the maximum value of the repetition times of Msg1 as the granularity.

Similarly, N≤1 means that one SSB can map N ROs. In addition, K _i /N≤K indicates that the number of repetitions of Msg1 corresponding to the SSB index i (that is, K _i ) is not the maximum value. At this time, in the embodiment of the present application, the M _i ROs determined according to K _i are located in the same RO group, so that K _i ROs are selected from the same RO group, so as to transmit Msg1 multiple times (or repeatedly). Wherein, the RO group divides the time-domain resource indexes of the ROs according to the maximum value of the repetition times of Msg1 as the granularity.

◆If N>1, the same RO corresponds to N SSBs.

It should be noted that N>1 means that one RO can map N SSBs.

◆The repetition times of Msg1 corresponding to N SSBs corresponding to the same RO are the same or different.

It should be noted that one RO may be mapped to N SSBs, and the number of repetitions of Msg1 corresponding to each of the N SSBs may be the same or different.

● One is: the terminal device determines ROs in descending order (descending order) of the repetition times of Msg1 corresponding to the SSB index. The terminal device determines the ROs in ascending order (ascending order) for the SSB indexes with the repetition times of the same Msg1.

It should be noted that, in combination with the content in the above "(7) Mapping relationship between SSB index and RO", it can be seen that the mapping order can be sorted in descending order according to the number of repetitions of Msg1 corresponding to each SSB index, wherein The SSB index is sorted in ascending order.

●The other is: the terminal device determines the ROs sequentially in ascending order (ascending order) of the repetition times of Msg1 corresponding to the SSB index. The terminal device determines the ROs in ascending order (ascending order) for the SSB indexes with the repetition times of the same Msg1.

It should be noted that, in combination with the content in the above "(7) Mapping relationship between SSB index and RO", it can be seen that the mapping order can be sorted in ascending order according to the number of repetitions of Msg1 corresponding to each SSB index, wherein The SSB index is sorted in ascending order.

●Another one is: the terminal device determines the ROs sequentially in descending order (descending order) of the repetition times of Msg1 corresponding to the SSB index. For the SSB index of the repetition times of the same Msg1, the terminal device is in descending order (descending order) to determine RO's.

It should be noted that, in combination with the content in the above "(7) Mapping relationship between SSB index and RO", it can be seen that the mapping order can be sorted in descending order according to the number of repetitions of Msg1 corresponding to each SSB index, wherein The SSB index is sorted in descending order.

●Another one is: the terminal device determines the ROs in ascending order (in ascending order) of the repetition times of Msg1 corresponding to the SSB index. For the SSB indexes with the repetition times of the same Msg1, the terminal device determines ROs in descending order (descending order).

It should be noted that, in combination with the content in the above "(7) Mapping relationship between SSB index and RO", it can be seen that the mapping order can be sorted in ascending order according to the number of repetitions of Msg1 corresponding to each SSB index, wherein The SSB index is sorted in descending order.

(9) Examples

The following embodiments of the present application will respectively illustrate the content in the above "(7) Mapping relationship between SSB index and RO" and the above "(8) Sending Msg1".

Example 1:

As shown in FIG. 11 , the signal sent by the satellite 1110 forms at least six beams in the cell, that is, beam 1121 , beam 1122 , beam 1123 , beam 1124 , beam 1125 and beam 1126 . Each of the six beams corresponds to one SSB, that is, beam 1121 corresponds to SSB0, beam 1122 corresponds to SSB1, beam 1123 corresponds to SSB2, beam 1124 corresponds to SSB3, beam 1125 corresponds to SSB4, and beam 1126 corresponds to SSB5. At this time, there are at least 6 SSB indexes in the cell.

The network device configures the repetition times (K _i ) of Msg1 for each of the six SSB indexes in the cell through the system information, that is,

The network device configures N for the terminal device through the high-level parameter (such as the high-level parameter is the parameter SSB-per-rach-occasion), and configures the RO time domain for the terminal device through the high-level parameter (such as the high-level parameter is the parameter prach-ConfigurationIndex) The indexes of resources are index 0, index 1, index 2, index 3, index 4, index 5, index 6, index 7, index 8, index 9, index 10, index 11, index 12, index 13, index 14, index 15, ..., and the indices of the frequency domain resources configured with the RO through high-level parameters (such as the parameter msg1-FDM=4) are index 0, index 1, index 2, and index 3, respectively. Wherein, the time domain resources identified by two adjacent time domain resource indexes may be continuous or discontinuous.

When the six SSB indexes are mapped with RO, the specific implementation is as follows:

◆Sort the repetition times of Msg1 corresponding to the six SSB indexes in descending order, and sort the SSB indexes with the same repetition times in ascending order. The sorted SSB indexes are Therefore, when mapping, the mapping order is: SSB0→SSB4→SSB5→SSB1→SSB2→SSB3.

◆The maximum value among the repetition times of Msg1 corresponding to the six SSB indexes is eight. Therefore, the time-domain resource indexes of ROs are index 0-15, etc. Among them, the ROs with the same frequency-domain resource indexes and the time-domain resources identified by index 0-7 are an RO group, and the frequency-domain resource indexes are the same, index 8 The RO where the time domain resource identified by ~15 is located is another RO group, and so on. That is to say, one RO group includes time-domain resource indexes of 8 ROs.

◆Index the 6 SSBs first on the RO group whose time domain resource index is index 0~7 and the frequency domain resource index is the smallest, that is, on the RO group whose frequency domain resource index is index 0, according to the time domain resource index from small To the big order, the mapping is performed sequentially in the RO group. Next, after all the ROs in the RO group whose time domain resource index is index 0 to 7 and whose frequency domain resource index is the smallest are all mapped, the frequency domain resource index is added to obtain the RO group whose frequency domain resource index is index 1 (that is, the following An RO group), and then continue to map in the RO group in sequence according to the order of the time domain resource index from small to large, and so on. The number of repetitions of Msg1 corresponding to the SSB index is packaged and mapped in the time domain.

◆The 6 SSBs are indexed on the RO group when the time domain resource index is index 0~7, and the frequency domain resource index is increased to the maximum, that is, on the RO group whose frequency domain resource index is index 3, according to the time domain resource index After the mapping is completed in order from small to large, the time domain resource index of 8 ROs is added to obtain the next RO group, that is, the time domain resource index of the next RO group is index 8-15, and the frequency domain resource index is index 0. Similarly, on the RO group whose time-domain resource index is index 8-15 and whose frequency-domain resource index is index 0, the time-domain resource index is mapped in sequence in the RO group in ascending order of the time-domain resource index. After the time-domain resource index is index 8-15 and the frequency-domain resource index is index 0, all ROs are mapped, and the frequency-domain resource index is added to obtain the RO group whose frequency-domain resource index is index 1 (that is, the next RO group) , and then continue to map in the RO group sequentially in ascending order of the time-domain resource index, and so on. The number of repetitions of Msg1 corresponding to the SSB index is packaged and mapped in the time domain.

Case 1: N<1

If N=1/2, it means that each of the 6 SSBs is mapped to 2 ROs.

The specific mapping details are as follows:

1) Map SSB0

According to the mapping order, SSB0 is mapped first. Wherein, the repetition number (K ₀ ) of Msg1 corresponding to SSB0 is 8.

On the RO group whose time-domain resource index is index 0-7 and the frequency-domain resource index is the smallest, that is, the RO group whose frequency-domain resource index is index 0, map the SSB0 corresponding to the time-domain resource index in ascending order. RO, and after all the ROs in the RO group with the smallest frequency domain resource index are mapped, increase the frequency domain resource index to obtain the RO group with the frequency domain resource index index1, and then follow the order of the time domain resource index from small to large, in order Map the RO corresponding to SSB0.

SSB0 packages the overall mapping with 8 ROs on the RO group whose frequency domain resource index is index 0. At this time, SSB0 maps 8 ROs in the RO group, as shown in FIG. 12 . Among them, the 8 ROs in the dotted line box in Fig. 12 are an RO group, the resource index in the instant domain is index 0-7, and the resource index in the frequency domain is the RO group index 0.

Since N=1/2, SSB0 needs to be mapped to 2 ROs. At this time, SSB0 is packaged and mapped again.

In addition, since 8 SSB0s have been mapped to the RO group whose frequency domain resource index is index 0, the frequency domain resource index is added for mapping, that is, mapping is performed on the RO group whose frequency domain resource index is index1, as shown in Figure 13 . Among them, the 8 ROs in the dotted line box in Figure 13 are an RO group after adding frequency domain resource index, that is, the RO group with index 0-7 and frequency domain resource index index1.

2) Mapping SSB4

According to the mapping order, after the SSB0 mapping is completed, SSB4 is mapped next. Wherein, the repetition number (K ₄ ) of Msg1 corresponding to SSB4 is 4.

SSB4 packages the overall mapping with 4 ROs on the RO group whose frequency domain resource index is index 2, as shown in Figure 14. Among them, the 8 ROs in the dashed box in Figure 14 are an RO group after adding the frequency domain resource index, the instant domain resource index is index 0-7, and the frequency domain resource index is the RO group index 2.

Since N=1/2, SSB4 needs to be mapped to 2 ROs. At this point, SSB4 is packaged and mapped again.

In addition, since 4 SSB4s have been mapped on the RO group whose frequency domain resource index is index 2, the RO group is not fully mapped, so continue to map on the RO group, as shown in Figure 15.

3) Map SSB5

According to the mapping sequence, after the SSB4 mapping is completed, SSB5 is mapped next. Wherein, the repetition number (K ₅ ) of Msg1 corresponding to SSB5 is 4.

SSB5 packages the overall mapping with 4 ROs on the RO group whose frequency domain resource index is index 3, as shown in Figure 16. Among them, the 8 ROs in the dotted box in Figure 16 are an RO group after adding the frequency domain resource index, the instant domain resource index is index 0-7, and the frequency domain resource index is the RO group index 3.

Since N=1/2, SSB5 needs to be mapped to 2 ROs.

Similar to the above, as shown in Figure 17.

4) Map SSB1

According to the mapping sequence, after the SSB5 mapping is completed, SSB1 is mapped next. Wherein, the repetition number (K ₁ ) of Msg1 corresponding to SSB1 is 2. Since N=1/2, SSB1 needs to be mapped to 2 ROs.

Since the time domain resource index is index 0 to 7, and the frequency domain resource index is index 3, the RO group mapping is completed, so the time domain resource index is increased according to the order of the time domain resource index from small to large, and the time domain resource index of 8 ROs is used again. The resource index is mapped to the granularity-divided RO group, as shown in Figure 18. Among them, the 8 ROs in the dotted box in Figure 18 are an RO group after adding the time domain resource index, the time domain resource index is index 8-15, and the frequency domain resource index is the RO group index 0.

Similar to the above, as shown in Figure 19.

5) Map SSB2

According to the mapping sequence, after the SSB1 mapping is completed, SSB2 is mapped next. Wherein, the repetition number (K ₂ ) of Msg1 corresponding to SSB2 is 2. Since N=1/2, SSB2 needs to be mapped to 2 ROs.

Similar to the above, as shown in Figure 20. Among them, the 8 ROs in the dotted line box in Figure 20 are an RO group, the resource index in the real-time domain is index 8-15, and the resource index in the frequency domain is an RO group with index 0.

Similar to the above, as shown in Figure 21.

5) Map SSB3

According to the mapping sequence, after the SSB2 mapping is completed, SSB3 is mapped next. Wherein, the repetition number (K ₃ ) of Msg1 corresponding to SSB3 is 2. Since N=1/2, SSB3 needs to be mapped to 2 ROs.

Similar to the above, as shown in Figure 22. Among them, the 8 ROs in the dashed box in Figure 22 are an RO group after adding the frequency domain resource index, the instant domain resource index is index 8-15, and the frequency domain resource index is the RO group index 1.

Similar to the above, as shown in Figure 23.

So far, the six SSB index mappings are completed.

Case 2: N=1

If N=1, it means that each of the six SSBs is mapped to one RO.

The specific mapping details are as follows:

1) Map SSB0

According to the mapping order, SSB0 is mapped first. Wherein, the repetition number (K ₀ ) of Msg1 corresponding to SSB0 is 8. Since N=1, SSB0 needs to be mapped to one RO.

On the RO group whose time-domain resource index is index 0-7 and the frequency-domain resource index is the smallest, that is, the RO group whose frequency-domain resource index is index0, map the ROs corresponding to SSB0 in order of time-domain resource index from small to large .

SSB0 is mapped as a whole in 8 RO packages in the time domain, as shown in Figure 12.

2) Mapping SSB4

According to the mapping order, after the SSB0 mapping is completed, SSB4 is mapped next. Wherein, the repetition number (K ₄ ) of Msg1 corresponding to SSB4 is 4. Since N=1, SSB4 needs to be mapped to one RO, as shown in FIG. 24 . Among them, the 8 ROs in the dotted line box in FIG. 24 are an RO group after adding frequency domain resource index, that is, the RO group with index 0-7 and frequency domain resource index index1.

3) Map SSB5

According to the mapping sequence, after the SSB4 mapping is completed, SSB5 is mapped next. Wherein, the repetition number (K ₅ ) of Msg1 corresponding to SSB5 is 4. Since N=1, SSB5 needs to be mapped to one RO.

When mapping SSB5, it is similar to the above, as shown in Figure 25.

4) Map SSB1

According to the mapping sequence, after the SSB5 mapping is completed, SSB1 is mapped next. Wherein, the repetition number (K ₁ ) of Msg1 corresponding to SSB1 is 2. Since N=1, SSB1 needs to be mapped to one RO.

When mapping SSB1, it is similar to the above, as shown in Figure 26. Among them, the 8 ROs in the dotted box in Figure 26 are an RO group after adding the frequency domain resource index, the instant domain resource index is index 0-7, and the frequency domain resource index is the RO group index 2.

5) Map SSB2

According to the mapping sequence, after the SSB1 mapping is completed, SSB2 is mapped next. Wherein, the repetition number (K ₂ ) of Msg1 corresponding to SSB2 is 2. Since N=1, SSB2 needs to be mapped to one RO.

When mapping SSB2, it is similar to the above, as shown in Figure 27.

5) Map SSB3

According to the mapping sequence, after the SSB2 mapping is completed, SSB3 is mapped next. Wherein, the repetition number (K ₃ ) of Msg1 corresponding to SSB3 is 2. Since N=1, SSB3 needs to be mapped to one RO.

When mapping SSB3, it is similar to the above, as shown in Figure 28.

So far, the six SSB index mappings are completed.

Case 3: N>1

If N=2, it means that every 2 SSBs in the 6 SSBs are mapped to 1 RO.

Combined with the content in the above "①When N>1, SSB index mapping rules", in addition to the above, it is also necessary to implement the following:

◆The ROs mapped to each of the two SSB indexes are the same or different.

◆If there are two SSB indexes that map to the same RO, then the two SSB indexes are distinguished by the RA preamble index in the same RO.

The specific mapping details are as follows:

1) Map SSB0 and SSB4

According to the mapping order, SSB0 and SSB4 are mapped first. Wherein, the repetition number (K ₀ ) of Msg1 corresponding to SSB0 is 8, and the repetition number (K ₄ ) of Msg1 corresponding to SSB4 is 4.

On the RO group whose time-domain resource index is index 0-7 and the frequency-domain resource index is the smallest, that is, on the RO group whose frequency-domain resource index is index 0, map SSB0 and SSB4 correspondingly according to the order of time-domain resource index from small to large the RO.

As shown in Figure 29, in the RO group whose time-domain resource index is index 0-7 and frequency-domain resource index is index 0, SSB0 and SSB4 are mapped to ROs whose time-domain resource index is index 0-3, and RA preamble index to distinguish. Among them, SSB0 is associated with The RA preamble index ranges from 0 to 31, and the RA preamble index associated with SSB4 ranges from 32 to 63.

Only SSB0 is mapped on ROs with time domain resource indexes index 4~7, and the RA preamble index associated with SSB0 mapped on the ROs with index 4~7 is from 0~31, and the remaining RA preamble indexes are not performed. map.

2) Map SSB5 and SSB1

According to the mapping order, after SSB0 and SSB4 are mapped, SSB5 and SSB1 are mapped next. Wherein, the repetition number (K ₅ ) of Msg1 corresponding to SSB5 is 4, and the repetition number (K ₁ ) of Msg1 corresponding to SSB1 is 2.

Since the time domain resource index is index 0 to 7, and the RO on the RO group whose frequency domain resource index is index 0 has been mapped, the frequency domain resource index is added for mapping. Select the first 4 ROs in the RO group whose time domain resource index is index 0-7, the frequency domain resource index is index 1, and the RO group whose real-time resource index is 0-3, and map SSB5 and SSB1, as shown in Figure 30 shown.

In the RO group, SSB5 and SSB1 are mapped to ROs with time-domain resource indexes index 0 to 1, and are distinguished by RA preamble index. Among them, the RA preamble index associated with SSB5 is from 0 to 31, and the RA preamble index associated with SSB1 is from 32 to 63.

Only SSB5 is mapped on ROs with time domain resource indexes index 2~3, and the RA preamble index associated with SSB5 mapped on the ROs with index 2~3 is from 0~31, and the remaining RA preamble indexes are not performed. map.

3) Map SSB2 and SSB3

According to the mapping sequence, after the mapping of SSB5 and SSB1 is completed, SSB2 and SSB3 are mapped next. Wherein, the repetition number (K ₂ ) of Msg1 corresponding to SSB2 is 2, and the repetition number (K ₃ ) of Msg1 corresponding to SSB3 is 2.

Select two ROs in the RO group whose time-domain resource index is index 0-7, frequency-domain resource index is index1, and ROs whose time-domain resource index is index 4-5, and map SSB2 and SSB3, as shown in Figure 31 . Among them, the RA preamble index associated with SSB2 is from 0 to 31, and the RA preamble index associated with SSB3 is from 32 to 63.

So far, the six SSB index mappings are completed.

Example 2:

As shown in FIG. 32 , the signal sent by the satellite 3210 has at least 6 beams in the cell, that is, the beam 3221 , the beam 3222 , the beam 3223 , the beam 3224 , the beam 3225 and the beam 3226 . Among them, each of the 6 corresponds to one SSB, that is, beam 3221 corresponds to SSB0, beam 3222 corresponds to SSB1, beam 3223 corresponds to SSB2, beam 3224 corresponds to SSB3, beam 3225 corresponds to SSB4, and beam 3226 corresponds to SSB5.

The network device configures a Msg1 repetition number (K _i ) for each of the six beams through system information, and divides the SSB indexes corresponding to the same Msg1 repetition number into one group to obtain three SSB groups, namely Among them, SSB Group 0 (SSB Group ₀ ) includes SSB0, SSB Group 1 (SSB Group ₁ ) includes SSB1, SSB2 and SSB3, SSB Group 2 (SSB Group ₂ ) includes SSB4 and SSB5, and the repetition times of Msg1 corresponding to SSB Group 0 The number of repetitions of Msg1 corresponding to SSB group 1 is 2, and the number of repetitions of Msg1 corresponding to SSB group 2 is 4.

The network device configures N for the terminal device through the high-level parameter (such as the high-level parameter is the parameter SSB-per-rach-occasion), and configures the RO time domain for the terminal device through the high-level parameter (such as the high-level parameter is the parameter prach-ConfigurationIndex) The resource indexes are index 0, index 1, index 2, index 3, index 4, index 5, index 6, index 7, index 8, index 9, index 10, index 11, index 12, index 13, index 14, index 15. ..., and configure the indices of the frequency domain resources of the RO through high-level parameters (such as the parameter msg1-FDM=4) to be index 0, index 1, index 2, and index 3. When the SSB and RO in the three SSB groups are mapped, the specific implementation is as follows:

◆Sort the repetition times of Msg1 corresponding to each of the three SSB groups in descending order, and sort the SSB indexes in the same SSB group in ascending order, and the SSB indexes in the sorted SSB group are Therefore, during mapping, the mapping order is: SSB group 0 → SSB group 2 → SSB group 1 .

◆The maximum value of the repetition times of Msg1 corresponding to each of the three SSB groups is 8. Therefore, the time-domain resource indexes of ROs are respectively index 0-15, etc., wherein the ROs with the same frequency-domain resource indexes and the time-domain resources identified by index 0-7 are an RO group, and the frequency-domain resource indexes are the same, The RO where the time-domain resources identified by index 8-15 are located is another RO group, and so on. That is to say, one RO group includes time-domain resource indexes of 8 ROs.

◆The SSB indexes in the three SSB groups are firstly indexed on the RO group whose resource index in the time domain is index 0 to 7 and the resource index in the frequency domain is the smallest, that is, the RO group whose resource index in the frequency domain is index 0. Resource indexes are mapped sequentially in the RO group in ascending order. Next, in the RO group whose resource index in the time domain is index 0-7 and the resource index in the frequency domain is the smallest After all the mapping is completed, increase the frequency domain resource index to obtain the RO group with the frequency domain resource index index 1 (that is, the next RO group), and then continue to map in the RO group in order of the time domain resource index from small to large, and so on. The number of repetitions of Msg1 corresponding to the SSB index is packaged and mapped in the time domain.

◆The SSB index in the three SSB groups is on the RO group when the time domain resource index is index 0~7 and the frequency domain resource index is increased to the maximum, that is, the RO group with the frequency domain resource index being index 3, according to After the time-domain resource indexes are mapped in order from small to large, add 8 RO time-domain resource indexes to obtain the RO group, that is, the time-domain resource indexes of the RO group are index8-15, and the frequency-domain resource indexes of the RO group are index 0. Similarly, on the RO group whose time-domain resource index is index 8-15 and frequency-domain resource index is index 0, the time-domain resource index is mapped in the RO group in order from small to large. After the time-domain resource index is index 8-15, and the frequency-domain resource index is index 0, after all the ROs in the frequency-domain resource index are mapped, add the frequency-domain resource index to obtain the RO group with the frequency-domain resource index as index 1, and then follow the time-domain resource index The sequence from small to large continues to be mapped in the RO group, and so on. The number of repetitions of Msg1 corresponding to the SSB index is packaged and mapped in the time domain.

Case 1: N<1

If N=1/2, it means that each SSB in the 3 SSB groups is mapped to 2 ROs.

1) Map SSB0 in SSB group 0

Similar to the above "Example 1", as shown in Figure 12 and Figure 13.

2) Map SSB4 in SSB Group 2

Similar to the above "Example 1", as shown in Figure 14 and Figure 15.

3) Map SSB5 in SSB Group 2

Similar to the above "Example 1", as shown in Figure 16 and Figure 17.

4) Map SSB1 in SSB Group 1

Similar to the above "Example 1", as shown in Figure 18 and Figure 19.

5) Map SSB2 in SSB Group 1

Similar to the above "Example 1", as shown in Figure 20 and Figure 21.

6) Map SSB3 in SSB Group 1

Similar to the above "Example 1", as shown in Figure 22 and Figure 23.

So far, the six SSB index mappings are completed.

Case 2: N=1

If N=1, it means that each SSB in the three SSB groups is mapped to one RO.

The specific mapping details are as follows:

1) Map SSB0 in SSB group 0

Similar to the above "Example 1", as shown in Figure 12.

2) Map SSB4 in SSB Group 2

Similar to the above "Example 1", as shown in Figure 24.

3) Map SSB5 in SSB Group 2

Similar to the above "Example 1", as shown in Figure 25.

4) Map SSB1 in SSB Group 1

Similar to the above "Example 1", as shown in Figure 26.

5) Map SSB2 in SSB Group 1

Similar to the above "Example 1", as shown in Figure 27.

6) Map SSB3 in SSB Group 1

Similar to the above "Example 1", as shown in Figure 28.

So far, the six SSB index mappings are completed.

Case 3: N>1

If N=2, it means that 2 SSBs in each SSB group are mapped to 1 RO.

Combined with the content in the above "When N>1, SSB Index Mapping Rules", in addition to the above, the following needs to be implemented: ◆The ROs mapped by the two SSB indexes in each SSB group are the same.

◆The two SSB indexes in each SSB group are distinguished by the RA preamble index in the same RO.

The specific mapping details are as follows:

1) Map SSB0 in SSB group 0

According to the mapping order, SSB group 0 is mapped first. Wherein, the number of repetitions (K ₀ ) of Msg1 corresponding to SSB group 0 is 8.

On the RO group whose time domain resource index is index 0 to 7 and the frequency domain resource index is the smallest, that is, on the RO group whose frequency domain resource index is index 0, the SSB group 0 is mapped in sequence according to the order of the time domain resource index from small to large SSB0. Since SSB group 0 only includes one SSB index, SSB0 only occupies the first 32 RA preambles during mapping, and the remaining RA preambles are not mapped, as shown in Figure 33.

2) Map SSB4 and SSB5 in SSB Group 2

According to the mapping order, after mapping SSB group 0, continue to map SSB group 2. Wherein, the number of repetitions (K ₂ ) of Msg1 corresponding to SSB group 2 is 4.

Since the time domain resource index is index 0 to 7, and the RO on the RO group whose frequency domain resource index is index 0 has been mapped, the frequency domain resource index is added for mapping. Select the first 4 ROs in the RO group whose time-domain resource index is index 0-7, the frequency-domain resource index is index 1, and the ROs whose time-domain resource index is index 0-3, according to the order of the time-domain resource index from small to large Map SSB4 and SSB5 in SSB group 2 in turn, and distinguish them by RA preamble index, as shown in Figure 34. Among them, the RA preamble index associated with SSB4 is from 0 to 31, and the RA preamble index associated with SSB5 is from 32 to 63.

3) Map SSB1 and SSB2 in SSB Group 1

According to the mapping sequence, after mapping SSB group 2, continue to map SSB group 1. Wherein, the repetition number (K ₁ ) of Msg1 corresponding to SSB group 1 is 2.

Select two ROs in the RO group whose time-domain resource index is index 0-7, frequency-domain resource index is index1, and real-time domain resource index is index 4-5 ROs, and map in order of time-domain resource index from small to large SSB1 and SSB2 in SSB group 1 are distinguished by RA preamble index, as shown in Figure 35. Among them, the RA preamble index associated with SSB1 is from 0 to 31, and the RA preamble index associated with SSB2 is from 32 to 63.

4) Map SSB3 in SSB Group 1

According to the mapping sequence, after mapping SSB1 and SSB2, continue to map SSB3. Wherein, the repetition number (K ₁ ) of Msg1 corresponding to SSB group 1 is 2.

Select two ROs in the RO group whose time-domain resource index is index 0-7, frequency-domain resource index is index1, and real-time domain resource index is index 6-7 ROs, and map in order of time-domain resource index from small to large SSB3 in SSB group 1, and SSB3 only occupies the first 32 RA preambles during mapping, and the remaining RA preambles are not mapped, as shown in Figure 36.

So far, the six SSB index mappings are completed.

Example 3:

As shown in FIG. 37 , the signal sent by the satellite 3710 forms at least three beams in the cell, that is, a beam 3721 , a beam 3722 and a beam 3723 . Wherein, each of the three beams corresponds to one SSB, that is, beam 3721 corresponds to SSB0, beam 3722 corresponds to SSB1, and beam 3723 corresponds to SSB2. At this time, there are at least 3 SSB indexes in the cell.

The network device configures the repetition times (K _i ) of Msg1 for each of the three SSB indexes through the system information, that is,

The network device configures N for the terminal device through the high-level parameter (such as the high-level parameter is the parameter SSB-per-rach-occasion), and configures the RO time domain for the terminal device through the high-level parameter (such as the high-level parameter is the parameter prach-ConfigurationIndex) The resource indexes are index 0, index 1, index 2, index 3, index 4, index 5, index 6, index 7, index 8, index 9, index 10, index 11, index 12, index 13, index 14, index 15. ..., and configure a time-domain resource index of an RO through a high-level parameter (for example, the high-level parameter is the parameter msg1-FDM=1), and there is a frequency domain resource index 0 on it.

When the three SSB indexes are mapped to the RO, the specific implementation is as follows:

◆Sort the repetition times of Msg1 corresponding to the three SSB indexes in descending order, and sort the SSB indexes with the same repetition times in ascending order. The sorted SSB indexes are Therefore, when mapping, the mapping order is: SSB0→SSB2→SSB1.

◆The maximum value among the repetition times of Msg1 corresponding to the three SSB indexes is four. Therefore, the time-domain resource indexes of ROs are respectively index 0-15, among which, the ROs with the same frequency-domain resource indexes and the time-domain resources identified by index0-3 are an RO group, and the frequency-domain resource indexes are the same, index4 The ROs where the time-domain resources identified by ~7 are an RO group, the frequency-domain resource indexes are the same, and the ROs where the time-domain resources identified by indexes 8-11 are located are an RO group, the frequency-domain resource indexes are the same, and the ROs identified by indexes 12-15 The RO where the time-domain resource of the resource is located is an RO group, and so on. That is to say, one RO group includes time-domain resource indexes of four ROs.

◆The three SSB indexes are first mapped on the RO group whose time-domain resource index is index 0~3 and frequency-domain resource index is index0, and are mapped in the RO group according to the order of time-domain resource index from small to large. Next, the ROs in the RO group After all the mapping is completed, add the time domain resource index to get the RO group whose time domain resource index is index 4~7 and frequency domain resource index is index0, and continue to map in the RO group in order of time domain resource index from small to large , and so on.

Case 1: N<1

If N=1/2, it means that each of the 3 SSBs is mapped to 2 ROs.

The specific mapping details are as follows:

1) Map SSB0

According to the mapping order, SSB0 is mapped first. Wherein, the repetition number (K ₀ ) of Msg1 corresponding to SSB0 is 4.

On the RO group whose time-domain resource index is index 0-3 and frequency-domain resource index is index 0, the ROs corresponding to SSB0 are mapped in sequence according to the order of the time-domain resource index from small to large, and all ROs in the RO group After the mapping is complete, add the time domain resource index to get the RO group whose time domain resource index is index 4 to 7 and frequency domain resource index is 0, and map the ROs corresponding to SSB0 in order of time domain resource index from small to large.

SSB0 packages the overall mapping with 4 ROs on the RO group whose frequency domain resource index is index 0. At this time, SSB0 maps the four ROs in the RO group, as shown in Figure 38. Among them, the four ROs in the dotted line box in Figure 38 are an RO group, the resource index in the real-time domain is index 0-3, and the resource index in the frequency domain is the RO group index0.

In addition, since the time-domain resource index is index 0-3, four SSB0s have been mapped to the RO group with the frequency-domain resource index of index 0, and high-level parameters (such as the parameter msg1-FDM=1) configure a RO time-domain resource index There is one frequency domain resource on , so the time domain resource index is added for mapping, as shown in Figure 39. Among them, the four ROs in the dotted line box in Figure 39 are an RO group, the resource index in the real-time domain is index 4-7, and the resource index in the frequency domain is the RO group index0.

2) Map SSB2

According to the mapping sequence, after the SSB0 mapping is completed, SSB2 is mapped next. Wherein, the repetition number (K ₂ ) of Msg1 corresponding to SSB2 is 2.

SSB2 packs the overall mapping with 2 ROs in the time domain, as shown in Figure 40. Among them, the four ROs in the dashed box in Figure 40 are an RO group after adding time domain resource index, the time domain resource index is index 8-11, and the frequency domain resource index is the RO group index 0.

Since N=1/2, SSB2 needs to be mapped to 2 ROs. At this point, SSB2 is packaged and mapped again, as shown in Figure 41.

3) Map SSB1

According to the mapping sequence, after the SSB2 mapping is completed, SSB1 is mapped next. Wherein, the repetition number (K ₁ ) of Msg1 corresponding to SSB1 is 1. Since N=1/2, SSB1 needs to be repeatedly mapped to two ROs.

Similar to above, as shown in Figure 42. Among them, the four ROs in the dotted line box in Figure 42 are an RO group, the resource index in the real-time domain is index 12-15, and the resource index in the frequency domain is an RO group with index 0.

Similar to above, as shown in Figure 43.

So far, the three SSB index mappings are completed.

Case 2: N=1

If N=1, it means that each of the three SSBs is mapped to one RO.

The specific mapping details are as follows:

1) Map SSB0

On the RO group whose time-domain resource index is index 0-3 and frequency-domain resource index is index 0, the ROs corresponding to SSB0 are mapped in sequence according to the order of time-domain resource index from small to large.

Since N=1, SSB0 needs to be mapped to one RO.

SSB0 is mapped in four RO packages in the time domain, as shown in Figure 38.

2) Map SSB2

According to the mapping sequence, after the SSB0 mapping is completed, SSB2 is mapped next. Wherein, the repetition number (K ₂ ) of Msg1 corresponding to SSB2 is 2. Since N=1, SSB2 needs to be mapped to one RO.

SSB2 packs the overall mapping with 2 ROs in the time domain, as shown in Figure 44. Among them, the four ROs in the dashed box in Figure 44 are an RO group after adding time domain resource index, the time domain resource index is index 4 to 7, and the frequency domain resource index is the RO group index 0.

3) Map SSB1

According to the mapping sequence, after the SSB2 mapping is completed, SSB1 is mapped next. Wherein, the repetition number (K ₁ ) of Msg1 corresponding to SSB1 is 1. Since N=1, SSB1 needs to be mapped to one RO.

When mapping SSB1, it is similar to the above, as shown in Figure 45.

So far, the three SSB index mappings are completed.

Case 3: N>1

If N=2, it means that every 2 SSBs in the 3 SSBs are mapped to 1 RO.

Combined with the content in the above "When N>1, SSB index mapping rules", in addition to the above, it is also necessary to implement the following:

◆The ROs mapped to each of the two SSB indexes are the same or different.

The specific mapping details are as follows:

1) Map SSB0 and SSB2

According to the mapping sequence, SSB0 and SSB2 are mapped first. Wherein, the repetition number (K ₀ ) of Msg1 corresponding to SSB0 is 4, and the repetition number (K ₂ ) of Msg1 corresponding to SSB2 is 2.

On the RO group whose time-domain resource index is 0-3 and whose frequency-domain resource index is index0, the ROs corresponding to SSB0 and SSB4 are mapped sequentially according to the sequence of time-domain resource indexes from small to large.

As shown in Figure 46, in the RO group whose time-domain resource index is 0-3 and frequency-domain resource index is index 0, SSB0 and SSB2 are mapped to the ROs whose time-domain resource index is index 0-1, and RA preamble index to distinguish. Among them, the RA preamble index associated with SSB0 is from 0 to 31, and the RA preamble index associated with SSB2 is from 32 to 63.

Only SSB0 is mapped on the ROs whose time domain resource indexes are index 2~3, and the RA preamble index associated with SSB0 mapped by the index 2~3 ROs is from 0~31, and the remaining RA preamble indexes are not mapped. .

2) Map SSB1

According to the mapping order, after the mapping of SSB0 and SSB2 is completed, SSB1 is mapped next. Wherein, the repetition number (K ₁ ) of Msg1 corresponding to SSB1 is 1.

Since the time domain resource index is 0 to 3, the RO on the RO group with the frequency domain resource index index 0 has been mapped, and there is 1 on the time domain resource index of an RO configured with high-level parameters (such as the parameter msg1-FDM=1) Frequency domain resources, so increase the time domain resource index for mapping. Select the first RO in the RO group whose time-domain resource index is index 4-7, frequency-domain resource index is index 0, and the RO whose real-time domain resource index is index 4, and map SSB1, and the index 4 mapped The RA preamble index associated with SSB1 is from 0 to 31, and the remaining RA preamble indexes are not mapped, as shown in Figure 47.

So far, the three SSB index mappings are completed.

5. An exemplary description of a communication method

To sum up, the following uses the interaction between a network device and a terminal device as an example to introduce a communication method according to an embodiment of the present application. Wherein, the network device may also be a chip/chip module/device, etc., and the terminal device may also be a chip/chip module/device, etc., which are not specifically limited.

As shown in FIG. 48, it is a schematic flowchart of a communication method in the embodiment of the present application, which specifically includes the following steps:

S4810. The network device sends indication information, where the indication information is used to indicate K _i .

Among them, K _i is the number of repetitions of the random access request message corresponding to the SSB index i in the first cell, 1≤i≤M, M is the total number of SSBs in the first cell, and K _i is greater than or equal to 1 positive integer.

Wherein, the SSB indicated by the SSB index i is the SSB selected by the terminal device from the monitored SSBs.

Correspondingly, the terminal device receives the indication information.

It should be noted that, for the "indication information", "first cell", "K _i ", etc., refer to the above content for details, and details will not be repeated here.

S4820. The terminal device sends a random access request message according to K _i .

Correspondingly, the network device receives the random access request message.

It can be seen that in the embodiment of the present application, since the network device can indicate to the terminal device the number of repetitions of the random access request message corresponding to the SSB index through the indication information, the terminal device can select a certain SSB according to the number of times used to identify the SSB The number of repetitions of the random access request message corresponding to the SSB index, and the random access request message is sent to achieve coverage enhancement, which is conducive to improving the transmission reliability of the random access request message and improving the possibility of successful random access of the terminal device .

In the embodiment of the present application, in the case that the terminal device sends the random access request message according to K _i , the number of repetitions for the terminal device to send the random access request message is not greater than K _i . For example, when the terminal device sends the random access request message for the kth time, the random access is successful. If k is less than K _i , the terminal device does not need to send the random access request message repeatedly.

It should be noted that, the above embodiments of the present application are described above using the indication information for K _i as an example. In the embodiment of the present application, the indication information may also indicate the repetition of two or more random access request messages The number of times, the specific number of times the terminal device sends the random access request message according to which random access request message is repeated, is related to which SSB the terminal device selects. Taking the terminal device selecting SSB1 as an example, the terminal device sends the random access request message according to the number of repetitions of the random access request message corresponding to SSB1.

The network device may indicate to the terminal device the number of repetitions of the random access request message corresponding to the SSB through the system information. After listening to at least one SSB, the terminal device selects one SSB from the at least one SSB to camp on the cell, and sends the random access request message multiple times according to the number of repetitions of the random access request message corresponding to the selected SSB. For example, the repetition times of random access request messages indicated by different SSBs of the same cell may be the same or different. For example, the repetition times of the random access request message corresponding to SSB1 and the repetition times of the random access request message corresponding to SSB2 may be the same or different. In some possible implementations, the indication information may be sent or received during cell search, cell reselection, uplink and downlink synchronization, cell access, cell camping, initial access, or uplink and downlink resource scheduling. Do limited.

In addition, the network device may also indicate to the terminal device the random access request message corresponding to the SSB through high-layer signaling (such as RRC signaling). In this case, high layer signaling includes indication information. Certainly, the message or signaling carrying indication information is not limited in this embodiment of the present application.

In some possible implementations, the indication information is used to indicate K _i , where K _i is the number of repetitions of Msg1 corresponding to SSB index i, where the SSB identified by SSB index i is the SSB in the first cell, and 1≤i≤ M, i is a positive integer, and M is the total number of SSBs in the first cell.

In some possible implementations, the indication information is also used to indicate K _j , where K _j is the number of repetitions of Msg1 corresponding to the SSB index j, where the SSB identified by the SSB index j is the SSB in the first cell, and the SSB index j The identified SSB is different from the SSB identified by the SSS index i, that is, j and i are different values. 1≤j≤M, j is a positive integer, and M is the total number of SSBs in the first cell.

In some possible implementations, the repetition times of Msg1 corresponding to different SSB indexes are different. Take SSB index i and SSB index j as an example. SSB index i corresponds to K _i , SSB index j corresponds to K _j , and when the repetition times of Msg1 corresponding to different SSB indexes are different, K _i and K _j are different.

It should be noted that since SSB index i and SSB index j are two different SSB indexes, the embodiment of the present application can configure different repetition times of Msg1 to different SSB indexes, that is, K _i and K _j are different, so as to improve Configuration flexibility.

In some possible implementations, the repetition times of Msg1 corresponding to SSBs corresponding to different beams are different. Take SSB index i and SSB index j as an example. SSB index i corresponds to K _i , and SSB index j corresponds to K _j . If the beam corresponding to the SSB identified by the SSB index i is different from the beam corresponding to the SSB identified by the SSB index j, K _i and K _j are different. In some embodiments, if the beam corresponding to the SSB identified by the SSB index i is the same as the beam corresponding to the SSB identified by the SSB index j, then K _i and K _j may be different or the same.

It should be noted that, since beams correspond to SSBs, and different beams correspond to different SSBs, in this embodiment of the present application, different repetition times of Msg1 may be configured for SSBs corresponding to different beams.

In some other embodiments of the present application, the network device may select from the set of candidate values of the repetition number of Msg1 to indicate the repetition number of Msg1 corresponding to the SSB index for the terminal device. The set of candidate values for the number of repetitions of Msg1 may be predefined by a protocol, determined by a network device based on a certain algorithm or policy, or instructed by other devices or servers, which is not limited. Exemplarily, the repetition count candidate value set of Msg1 may include at least one candidate value. For example, each candidate value is a power of 2. In this case, the set of candidate values for the number of repetitions of Msg1 is set {1, 2, 4, 8, 16, . . . , 2 ⁿ }. For example, take SSB index i as an example. The SSB index i corresponds to K _i , where K _i =2 ^a , and a is a positive integer greater than or equal to 0.

In some possible implementations, the sending of the random access request message according to K _i in S4820 may include the following steps:

The terminal device determines M _i ROs according to K _i , K _i ≤ M _i ≤ K _i *L; where, L=N, N>1; or, L=1/N, N≤1; N is used to indicate SSB The mapping relationship between the SSB indicated by the index i and the RO;

The terminal device selects K _i ROs from the M _i ROs, and sends a random access request message.

It should be noted that since Msg1 needs to be carried (or transmitted) by ROs, in order to send Msg1, this embodiment of the present application needs to determine M _i ROs according to K _i , and send them through K _i ROs in M _i ROs Msg1 to realize multiple (or repeated) transmission of Msg1.

In some possible implementations, the value of N is one of 1/8, 1/4, 1/2, 1, 2, 4, 8, and 16.

In some possible implementations, if K _i =K, and N≤1, then

The M _i ROs are divided into 1/N RO groups, and the RO group includes K ROs in the time domain, where K is the maximum value among the repetition times of the random access request message indicated by the indication information.

In addition, K _i =K, which means that the number of repetitions of Msg1 corresponding to the SSB index i (that is, K _i ) is the maximum value. In addition, N≤1 means that one SSB can map N ROs. Since the embodiment of the present application needs to repeat the Msg1 corresponding to the SSB indexes in the first cell The maximum number of times is the granularity to divide the time-domain resource index of the RO, so the embodiment of the present application can determine 1/N RO groups according to K _i , and each RO group includes K ROs in the time domain, so that Select one RO group from the 1/N RO groups to obtain K ROs, so as to transmit Msg1 multiple times (or repeatedly).

In some possible implementations, if N>1, or if N≤1 and K _i /N≤K, then

The M _i ROs are located in the same RO group, and the RO group includes K ROs in the time domain, where K is the maximum value among the repetition times of the random access request message indicated by the indication information.

It should be noted that the RO group may include time-domain resource indexes of K ROs. That is, the RO includes K ROs in the time domain.

In some possible implementations, if N>1, the same RO corresponds to N SSBs.

It should be noted that N>1 means that one RO can map N SSBs.

In some possible implementations, the repetition times of the random access request messages corresponding to the N SSBs corresponding to the same RO are the same or different.

In some possible implementations, the terminal device sequentially determines the ROs in descending order of the number of repetitions of the random access request message corresponding to the SSB index.

In some possible implementations, the terminal device determines the ROs in ascending order for the SSB indexes with the repetition times of the same random access request message.

In some possible implementations, the terminal device determines the ROs sequentially in ascending order (in ascending order) of the repetition times of Msg1 corresponding to the SSB index. The terminal device determines the ROs in ascending order (ascending order) for the SSB indexes with the repetition times of the same Msg1.

In some possible implementations, the terminal device sequentially determines the ROs in descending order (descending order) of the repetition times of Msg1 corresponding to the SSB index. The terminal device determines the ROs in descending order (descending order) for the SSB indexes with the repetition times of the same Msg1.

In some possible implementations, the terminal device determines the ROs sequentially in ascending order (in ascending order) of the repetition times of Msg1 corresponding to the SSB index. For the SSB indexes with the repetition times of the same Msg1, the terminal device determines ROs in descending order (descending order).

The various embodiments in this application can be used alone or in combination with each other to achieve different technical effects.

6. An exemplary description of a communication device

The foregoing mainly introduces the solutions of the embodiments of the present application from the perspective of the method side. It can be understood that, in order to realize the above-mentioned functions, the terminal device or network device includes corresponding hardware structures and/or software modules for performing various functions. Those skilled in the art should easily realize that the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a certain function is executed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may implement the described functionality using different methods for each particular application, but such implementation should not be considered as exceeding the scope of the present application.

In this embodiment of the present application, the terminal device or the network device may be divided into functional units according to the foregoing method examples. For example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The above-mentioned integrated units can be implemented not only in the form of hardware, but also in the form of software program modules. It should be noted that the division of units in the embodiment of the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation.

In the case of using integrated units, FIG. 49 is a block diagram of functional units of a communication device according to an embodiment of the present application. The communication device 4900 includes: a receiving unit 4901 and a sending unit 4902 .

It should be noted that the receiving unit 4901 may be a modular unit for sending and receiving signals, data, information, and the like.

The sending unit 4902 may be a modular unit for processing signals, data, information, etc., which is not specifically limited.

The communication device 4900 may also include a storage unit for storing computer program codes or instructions executed by the communication device 4900 . The storage unit may be a memory.

In addition, it should be noted that the communication device 4900 may be a chip or a chip module.

In some possible implementations, the receiving unit 4901 and the sending unit 4902 may be integrated into one unit, or separate units.

For example, the receiving unit 4901 and the sending unit 4902 may be integrated in a communication unit. Wherein, the communication unit may be a communication interface, a transceiver, a transceiver circuit, and the like.

For another example, the receiving unit 4901 and the sending unit 4902 may be integrated into a processing unit. Wherein, the processing unit may be a processor or a controller, such as a central processing unit (central processing unit, CPU), a general purpose processor, a digital signal processor (digital signal processor, DSP), an application-specific integrated circuit (application-specific integrated circuit) circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processing unit may also be a combination that realizes computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and the like.

During specific implementation, the receiving unit 4901 and the sending unit 4902 are used to perform any step performed by the terminal device, chip, chip module, etc. in the above method embodiments, such as data transmission such as sending or receiving. Detailed description will be given below.

The receiving unit 4901 is configured to receive indication information, the indication information is used to indicate K _i , K _i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤M, M is the total number of SSBs in the first cell, K _i is a positive integer greater than or equal to 1;

The sending unit 4902 is configured to send a random access request message according to K _i , and the SSB indicated by the SSB index i is the SSB selected by the terminal device from the monitored SSBs.

It can be seen that, in the embodiment of the present application, by introducing the indication information, the indication information can indicate the SSB index or the number of repetitions of the random access request message configured by the SSB, and then the communication device 4900 can use the random access request message corresponding to the selected SSB The number of repetitions, sending the random access request message to the network device multiple times (or repeatedly), thus helping to achieve coverage enhancement, improve the transmission reliability of the random access request message, and improve the possibility of successful random access of the communication device 4900 .

It should be noted that, for the specific implementation of each operation in the embodiment shown in FIG. 49 , refer to the description in the above-mentioned method embodiment for details, and details are not repeated here.

In some possible implementations, the indication information is also used to indicate K _j , where K _j is the number of repetitions of Msg1 corresponding to SSB index j, where the SSB identified by SSB index j is the SSB in the first cell, and SSB index j The identified SSB is different from the SSB identified by the SSS index i, that is, j and i are different values. 1≤j≤M, j is a positive integer, and M is the total number of SSBs in the first cell.

In some possible implementations, K _i is different from K _j .

In some possible implementations, the beam corresponding to the SSB indicated by the SSB index i is different from the beam corresponding to the SSB indicated by the SSB index j.

In some possible implementations, according to K _i , in terms of sending a random access request message, the sending unit 3802 is configured to:

In some possible implementations, if K _i =K, and N≤1, then

In some possible implementations, if N>1, or if N≤1 and K _i /N≤K, then

In some possible implementations, if N>1, the same RO corresponds to N SSBs.

In some possible implementations, the communications apparatus 4900 sequentially determines the ROs in descending order of the number of repetitions of the random access request message corresponding to the SSB index.

In some possible implementations, the communications apparatus 4900 determines the ROs in ascending order for the SSB indexes with the repetition times of the same random access request message.

7. An exemplary description of another communication device

In the case of using integrated units, FIG. 50 is a block diagram of functional units of another communication device according to an embodiment of the present application. The communication device 5000 includes: a sending unit 5001 .

It should be noted that the sending unit 5001 may be a modular unit for sending and receiving signals, data, information, etc., which is not specifically limited.

The communication device 5000 may further include a storage unit for storing computer program codes or instructions executed by the communication device 5000 . The storage unit may be a memory.

In addition, it should be noted that the communication device 5000 may be a chip or a chip module.

In some possible implementations, the sending unit 5001 is integrated in the processing unit. Wherein, the processing unit may be a processor or a controller, such as a central processing unit (central processing unit, CPU), a general purpose processor, a digital signal processor (digital signal processor, DSP), an application-specific integrated circuit (application-specific integrated circuit) circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processing unit may also be a combination that realizes computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and the like.

In some possible implementations, the sending unit 5001 is integrated in the communication unit. Wherein, the communication unit may be a communication interface, a transceiver, a transceiver circuit, and the like.

During specific implementation, the sending unit 5001 is configured to perform any step performed by the network device, chip, chip module, etc. in the above method embodiments, such as sending data/signals/information. Detailed description will be given below.

The sending unit 5001 is configured to send indication information, where the indication information is used to indicate K _i , where K _i is the number of repetitions of Msg1 corresponding to the SSB index i, wherein the SSB identified by the SSB index i is the SSB in the first cell, 1 ≤i≤M, i is a positive integer, and M is the total number of SSBs in the first cell.

It can be seen that by introducing the indication information in the embodiment of the present application, the communication device 5000 can indicate to the terminal device the number of repetitions (repetition) of the random access request message configured for the SSB index or SSB through the indication information, and then the terminal device can use the selected The number of repetitions of the random access request message corresponding to the SSB sends the random access request message to the communication device more than 5000 times (or repeats), thus helping to achieve coverage enhancement, improving the transmission reliability of the random access request message, and improving Probability of successful random access of the terminal device.

It should be noted that, for the specific implementation of each operation in the embodiment shown in FIG. 50 , refer to the description in the above-mentioned method embodiment for details, and details are not repeated here.

8. An exemplary description of a terminal device

Please refer to FIG. 51 , which is a schematic structural diagram of a terminal device according to an embodiment of the present application. Wherein, the terminal device 5100 includes a processor 5110 , a memory 5120 and a communication bus for connecting the processor 5110 and the memory 5120 .

The memory 5120 includes but is not limited to random access memory (random access memory, RAM), read-only memory (read-only memory, ROM), erasable programmable read-only memory (erasable programmable read-only memory, EPROM) or Portable read-only memory (compact disc read-only memory, CD-ROM), the memory 5120 is used to store program codes executed by the terminal device 5100 and transmitted data.

The terminal device 5100 also includes a communication interface for receiving and sending data.

The processor 5110 may be one or more CPUs. When the processor 5110 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

The processor 5110 in the terminal device 5100 is configured to execute the computer program or instruction 5121 stored in the memory 5120, and perform the following operations: receive indication information, the indication information is used to indicate K _i , and K _i is the repetition of Msg1 corresponding to the SSB index i The number of times, wherein, the SSB identified by the SSB index i is the SSB in the first cell, 1≤i≤M, i is a positive integer, and M is the total number of SSBs in the first cell. According to K _i , send a random access request message.

It can be seen that in the embodiment of the present application, since the network device can indicate to the terminal device the number of repetitions of the random access request message corresponding to the SSB index through the indication information, the terminal device 5100 can select a certain SSB according to the The number of repetitions of the random access request message corresponding to the SSB index of the SSB, the random access request message is sent multiple times, which helps to achieve coverage enhancement, improve the transmission reliability of the random access request message, and improve the random access of terminal equipment probability of success.

It should be noted that the specific implementation of each operation can use the corresponding description of the above-mentioned method embodiments, and the terminal device 5100 can be used to execute the method on the terminal device side of the above-mentioned method embodiments of the present application, which will not be described in detail here.

9. An exemplary description of a network device

Please refer to FIG. 52, which is a schematic structural diagram of a network device according to an embodiment of the present application. Wherein, the network device 5200 includes a processor 5210 , a memory 5220 and a communication bus for connecting the processor 5210 and the memory 5220 .

The memory 5220 includes but not limited to RAM, ROM, EPROM or CD-ROM, and the memory 5220 is used to store related instructions and data.

Network device 5200 also includes a communication interface for receiving and sending data.

The processor 5210 may be one or more CPUs. When the processor 5210 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

The processor 5210 in the network device 5200 is configured to execute the computer program stored in the memory 5220 or the instruction 5221 to perform the following operations: send indication information, the indication information is used to indicate K _i , and K _i is the synchronization signal block SSB index in the first cell The number of repetitions of the random access request message corresponding to i, 1≤i≤M, M is the total number of SSBs in the first cell, and K _i is a positive integer greater than or equal to 1.

It can be seen that in the embodiment of the present application, in order to enhance the coverage under the communication system, the embodiment of the present application introduces the number of repetitions of the random access request message, and configures the random access request message corresponding to the SSB index through the indication information The number of repetitions of the random access request message, so that according to the number of repetitions of the random access request message, the random access request message is sent to achieve coverage enhancement, which is conducive to improving the transmission reliability of the random access request message and improving the possibility of successful random access of the terminal device sex.

It should be noted that the specific implementation of each operation can use the corresponding description of the above-mentioned method embodiments, and the network device 5200 can be used to execute the method on the network device side of the above-mentioned method embodiments of the present application, which will not be described in detail here.

10. Other illustrative instructions

An embodiment of the present application also provides a chip, including a processor, a memory, and a computer program or instruction stored on the memory, wherein the processor executes the computer program or instruction to implement the steps described in the above method embodiments.

The embodiment of the present application also provides a chip module, including a transceiver component and a chip. The chip includes a processor, a memory, and a computer program or instruction stored on the memory, wherein the processor executes the computer program or instruction to The steps described in the above method embodiments are implemented.

The embodiment of the present application also provides a computer-readable storage medium, which stores a computer program or instruction, and when the computer program or instruction is executed, implements the steps described in the above method embodiments.

The embodiment of the present application also provides a computer program product, including a computer program or an instruction. When the computer program or instruction is executed, the steps described in the above method embodiments are implemented.

In the above-mentioned embodiments, the embodiments of the present application have different emphases in the description of each embodiment, and for the parts not described in detail in a certain embodiment, refer to the relevant descriptions of other embodiments.

The steps of the methods or algorithms described in the embodiments of the present application may be implemented in the form of hardware, or may be implemented in the form of a processor executing software instructions. Software instructions can be composed of corresponding software modules, and software modules can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (erasable programmable ROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), registers, hard disk, removable hard disk, compact disc read-only (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC can be located in the terminal device or the management device. Certainly, the processor and the storage medium may also exist in the terminal device or the management device as discrete components.

Those skilled in the art should be aware that, in the above one or more examples, the functions described in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored in, or transmitted from, one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be sent from a website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) Transmission to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)) wait.

The modules/units included in the devices and products described in the above embodiments may be software modules/units, hardware modules/units, or partly software modules/units and partly hardware modules/units. For example, for each device or product applied to or integrated in a chip, each module/unit contained in it may be implemented by hardware such as a circuit, or at least part of the module The block/unit can be realized by means of a software program, the software program runs on the processor integrated in the chip, and the remaining (if any) part of the modules/units can be realized by hardware such as circuits; Each of the devices and products, each module/unit contained in it may be realized by hardware such as a circuit, and different modules/units may be located in the same component (such as a chip, a circuit module, etc.) or in different components of the chip module, or , at least part of the modules/units can be realized by means of a software program, the software program runs on the processor integrated in the chip module, and the remaining (if any) parts of the modules/units can be realized by means of hardware such as circuits; Each device or product integrated in the terminal equipment may contain various modules/units that may be realized by means of hardware such as circuits, and different modules/units may be located in the same component (such as a chip, circuit module, etc.) or in different components in the terminal equipment. In the components, or at least part of the modules/units can be implemented in the form of a software program, the software program runs on the processor integrated in the terminal device, and the remaining (if any) parts of the modules/units can be implemented in hardware such as circuits.

The specific implementation manners described above further describe the purpose, technical solutions and beneficial effects of the embodiments of the present application in detail. To limit the protection scope of the embodiments of the present application, any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

A communication method, characterized in that it is applied to a terminal device; the method includes:

receiving indication information, where the indication information is used to indicate K i , where K i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤M, and the M is the total number of SSBs in the first cell, and the K i is a positive integer greater than or equal to 1;

According to the K i , a random access request message is sent, and the SSB indicated by the SSB index i is the SSB selected by the terminal device from the monitored SSBs.
The method according to claim 1, wherein the Ki is a candidate value in a set of candidate values for the number of repetitions of the random access request message; and/or, the K i =2 a , where a is greater than or A positive integer equal to 0.
The method according to claim 1 or 2, wherein the indication information is further used to indicate K j , and the K j is the repetition of the random access request message corresponding to the SSB index j in the first cell Times, 1≤j≤M, j and i are different values.
The method of claim 3, wherein said Ki is different from said Kj .
The method according to claim 4, wherein the beam corresponding to the SSB indicated by the SSB index i is different from the beam corresponding to the SSB indicated by the SSB index j.
The method according to claim 1, wherein the sending a random access request message according to the K i includes:

According to the K i , determine M i random access opportunities RO, K i ≤ M i ≤ K i *L; where, L=N, N>1; or, L=1/N, N≤1; N used to indicate the mapping relationship between the SSB indicated by the SSB index i and the RO;

Select K i ROs from the M i ROs, and send the random access request message.
The method according to claim 6, wherein the value of N is one of 1/8, 1/4, 1/2, 1, 2, 4, 8, and 16.
The method according to claim 6 or 7, wherein if K i =K, and N≤1, then

The M i ROs are divided into 1/N RO groups, and the RO group includes K ROs in the time domain, where K is the maximum value among the repetition times of the random access request message indicated by the indication information.
The method according to claim 6 or 7, wherein if N>1, or if N≤1 and K i /N≤K, then

The M i ROs are located in the same RO group, and the RO group includes K ROs in the time domain, where K is the maximum value among the repetition times of the random access request message indicated by the indication information.
The method according to claim 9, wherein if N>1, the same RO corresponds to N SSBs.
The method according to claim 10, characterized in that the repetition times of the random access request messages corresponding to the N SSBs corresponding to the same RO are the same or different.
The method according to any one of claims 8-10, wherein the terminal device determines the RO in descending order of the number of repetitions of the random access request message corresponding to the SSB index.
The method according to claim 12, wherein the terminal device determines the ROs in ascending order for the SSB index with the repetition times of the same random access request message.
A communication method, characterized in that it is applied to a network device; the method includes:

sending indication information, where the indication information is used to indicate K i , where K i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤M, and the M is the total number of SSBs in the first cell, and the K i is a positive integer greater than or equal to 1.
The method according to claim 14, wherein the Ki is a candidate value in a set of candidate values for the number of repetitions of the random access request message; and/or, the K i =2 a , where a is greater than or A positive integer equal to 0.
The method according to claim 14 or 15, wherein the indication information is further used to indicate K j , and the K j is the repetition of the random access request message corresponding to the SSB index j in the first cell Times, 1≤j≤M, j and i are different values.
The method of claim 16, wherein said Ki is different from said Kj .
The method according to claim 17, wherein the beam corresponding to the SSB indicated by the SSB index i is different from the beam corresponding to the SSB indicated by the SSB index j.
A communication device, characterized in that the device includes:

A receiving unit, configured to receive indication information, where the indication information is used to indicate K i , where K i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤ M, where M is the total number of SSBs in the first cell, and K i is a positive integer greater than or equal to 1;

A sending unit, configured to send a random access request message according to the K i , where the SSB indicated by the SSB index i is the SSB selected by the terminal device from the monitored SSBs.
The device according to claim 19, wherein the Ki is a set of candidate value sets of repetition times of the random access request message A candidate value in the combination; and/or, the K i =2 a , a is a positive integer greater than or equal to 0.
The device according to claim 19 or 20, wherein the indication information is further used to indicate K j , where K j is the repetition of the random access request message corresponding to the SSB index j in the first cell Times, 1≤j≤M, j and i are different values.
The apparatus of claim 21, wherein said Ki is different from said Kj .
The apparatus according to claim 22, wherein the beam corresponding to the SSB indicated by the SSB index i is different from the beam corresponding to the SSB indicated by the SSB index j.
The device according to claim 19, wherein, in terms of sending a random access request message according to the K i , the sending unit is configured to:

According to the K i , determine M i random access opportunities RO, K i ≤ M i ≤ K i *L; where, L=N, N>1; or, L=1/N, N≤1; N used to indicate the mapping relationship between the SSB indicated by the SSB index i and the RO;

Select K i ROs from the M i ROs, and send the random access request message.
The device according to claim 24, wherein the value of N is one of 1/8, 1/4, 1/2, 1, 2, 4, 8, and 16.
The device according to claim 24 or 25, wherein if K i =K, and N≤1, then

The M i ROs are divided into 1/N RO groups, and the RO group includes K ROs in the time domain, where K is the maximum value among the repetition times of the random access request message indicated by the indication information.
The device according to claim 24 or 25, wherein if N>1, or if N≤1 and K i /N≤K, then

The M i ROs are located in the same RO group, and the RO group includes K ROs in the time domain, where K is the maximum value among the repetition times of the random access request message indicated by the indication information.
The device according to claim 27, wherein if N>1, the same RO corresponds to N SSBs.
The device according to claim 28, characterized in that the repetition times of the random access request messages corresponding to the N SSBs corresponding to the same RO are the same or different.
The device according to any one of claims 26-28, wherein the device determines the ROs in descending order of the number of repetitions of the random access request message corresponding to the SSB index.
The device according to claim 30, characterized in that, for the SSB index with the repetition times of the same random access request message, the device determines ROs in ascending order.
A communication device, characterized in that the device includes:

A sending unit, configured to send indication information, where the indication information is used to indicate K i , where K i is the number of repetitions of the random access request message corresponding to the synchronization signal block SSB index i in the first cell, 1≤i≤ M, where M is the total number of SSBs in the first cell, and K i is a positive integer greater than or equal to 1.
The method according to claim 32, wherein the Ki is a candidate value in a set of candidate values for the number of repetitions of the random access request message; and/or, the K i =2 a , where a is greater than or A positive integer equal to 0.
The method according to claim 32 or 33, wherein the indication information is also used to indicate K j , where K j is the repetition of the random access request message corresponding to the SSB index j in the first cell Times, 1≤j≤M, j and i are different values.
The method of claim 34, wherein said Ki is different from said Kj .
The method according to claim 35, wherein the beam corresponding to the SSB indicated by the SSB index i is different from the beam corresponding to the SSB indicated by the SSB index j.
A terminal device, comprising a processor, a memory, and a computer program or instruction stored on the memory, wherein the processor executes the computer program or instruction to implement any one of claims 1-13 steps of the method described above.
A network device, comprising a processor, a memory, and a computer program or instruction stored on the memory, wherein the processor executes the computer program or instruction to implement any one of claims 14-18 steps of the method described above.
A computer-readable storage medium, characterized in that it stores computer programs or instructions, and when the computer programs or instructions are executed, the steps of the method described in any one of claims 1-13 or 14-18 are implemented.
A chip, comprising a processor, wherein the processor executes the steps of the method according to any one of claims 1-13 or 14-18.