CN117044324A

CN117044324A - Random access method, electronic equipment and storage medium

Info

Publication number: CN117044324A
Application number: CN202180096008.0A
Authority: CN
Inventors: 吴作敏
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2023-11-10
Also published as: WO2022205223A1

Abstract

The application discloses a random access method, which comprises the following steps: the terminal equipment acquires first indication information, wherein the first indication information comprises: back-off indication information and/or offset value indication information; and the terminal equipment initiates random access according to the back-off indication information and/or the offset value indication information. The application also discloses another random access method, an antenna polarization mode determining method, electronic equipment and a storage medium.

Description

Random access method, electronic equipment and storage medium

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a random access method, an electronic device, and a storage medium.

Background

In an internet of things (Internet of Things, ioT) -Non-terrestrial communication network (Non-Terrestrial Network, NTN) system, how to improve the success rate of random access when terminal devices in idle state that are awakened in different times initiate random access is a constantly pursuing goal.

Disclosure of Invention

The embodiment of the application provides a random access method, electronic equipment and a storage medium, which can improve the success rate of random access.

In a first aspect, an embodiment of the present application provides a random access method, including: the terminal equipment acquires first indication information, wherein the first indication information comprises: back-off indication information and/or offset value indication information;

and the terminal equipment initiates random access according to the back-off indication information and/or the offset value indication information.

In a second aspect, an embodiment of the present application provides a method for determining an antenna polarization mode, including: and the terminal equipment acquires an antenna polarization mode based on third indication information, wherein the third indication information is used for determining the antenna polarization mode.

In a third aspect, an embodiment of the present application provides a random access method, where the method includes:

the network equipment sends first indication information to the terminal equipment, wherein the first indication information comprises back-off indication information and/or offset value indication information, and the back-off indication information and/or the offset value indication information are used for the terminal equipment to initiate random access.

In a fourth aspect, an embodiment of the present application provides a method for determining an antenna polarization mode, where the method includes:

the network device sends third indication information to the terminal device, wherein the third indication information is used for determining an antenna polarization mode.

In a fifth aspect, an embodiment of the present application provides a terminal device, including: the first processing unit is configured to acquire first indication information, wherein the first indication information comprises: back-off indication information and/or offset value indication information;

and the first sending unit is configured to initiate random access according to the back-off indication information and/or the offset value indication information.

In a sixth aspect, an embodiment of the present application provides a terminal device, including: and a second processing unit configured to acquire an antenna polarization mode based on third instruction information, wherein the third instruction information is used for determining the antenna polarization mode.

In a seventh aspect, an embodiment of the present application provides a network device, including: the second sending unit is configured to send first indication information to the terminal equipment, wherein the first indication information comprises back-off indication information and/or offset value indication information, and the back-off indication information and/or the offset value indication information are used for the terminal equipment to initiate random access.

In an eighth aspect, an embodiment of the present application provides a network device, including: and a third transmitting unit configured to transmit third indication information to the terminal device, where the third indication information is used to determine an antenna polarization mode.

In a ninth aspect, an embodiment of the present application provides a terminal device, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute steps of a random access method executed by the terminal device when the computer program is run.

In a tenth aspect, an embodiment of the present application provides a terminal device, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute steps of the method for determining an antenna polarization mode executed by the terminal device when the computer program is run.

In an eleventh aspect, an embodiment of the present application provides a network device, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute steps of a random access method executed by the network device when running the computer program.

In a twelfth aspect, an embodiment of the present application provides a network device, including a processor and a memory for storing a computer program capable of running on the processor, where the processor is configured to execute steps of the method for determining an antenna polarization mode executed by the network device when the computer program is run.

In a thirteenth aspect, an embodiment of the present application provides a chip, including: and the processor is used for calling and running the computer program from the memory, so that the device provided with the chip executes the random access method executed by the terminal device.

In a fourteenth aspect, an embodiment of the present application provides a chip, including: and a processor for calling and running the computer program from the memory, so that the device installed with the chip executes the antenna polarization mode determining method executed by the terminal device.

In a fifteenth aspect, an embodiment of the present application provides a chip, including: and the processor is used for calling and running the computer program from the memory, so that the device provided with the chip executes the random access method executed by the network device.

In a sixteenth aspect, an embodiment of the present application provides a chip, including: and a processor for calling and running the computer program from the memory, so that the device installed with the chip executes the antenna polarization mode determining method executed by the network device.

In a seventeenth aspect, an embodiment of the present application provides a storage medium storing an executable program, where the executable program when executed by a processor implements the random access method executed by the terminal device.

In an eighteenth aspect, an embodiment of the present application provides a storage medium storing an executable program, where the executable program when executed by a processor implements the method for determining an antenna polarization mode performed by the terminal device.

In a nineteenth aspect, an embodiment of the present application provides a storage medium storing an executable program that, when executed by a processor, implements the random access method performed by the network device described above.

In a twentieth aspect, an embodiment of the present application provides a storage medium storing an executable program, where the executable program when executed by a processor implements the antenna polarization mode method executed by the network device.

In a twenty-first aspect, an embodiment of the present application provides a computer program product, including computer program instructions, where the computer program instructions cause a computer to perform the random access method performed by the terminal device.

In a twenty-second aspect, an embodiment of the present application provides a computer program product, including computer program instructions, where the computer program instructions cause a computer to perform the antenna polarization mode method performed by the terminal device.

In a twenty-third aspect, an embodiment of the present application provides a computer program product, including computer program instructions for causing a computer to execute the random access method executed by the network device.

In a twenty-fourth aspect, an embodiment of the present application provides a computer program product comprising computer program instructions for causing a computer to perform the antenna polarization mode method performed by the network device described above.

In a twenty-fifth aspect, an embodiment of the present application provides a computer program, which causes a computer to execute a random access method executed by the above terminal device.

In a twenty-sixth aspect, an embodiment of the present application provides a computer program, where the computer program causes a computer to execute the antenna polarization mode method executed by the terminal device.

In a twenty-seventh aspect, an embodiment of the present application provides a computer program, where the computer program causes a computer to execute a random access method executed by the network device.

In a twenty-eighth aspect, an embodiment of the present application provides a computer program, where the computer program causes a computer to execute the antenna polarization mode method executed by the network device.

Drawings

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

fig. 2 is a schematic diagram of another architecture of a communication system according to an embodiment of the present application;

fig. 3 is a schematic architecture diagram of another communication system according to an embodiment of the present application;

Fig. 4 is a schematic diagram of an NTN scenario based on a transparent forwarding satellite and a regenerated forwarding satellite according to an embodiment of the present application;

fig. 5 is another schematic diagram of an NTN scenario based on a transparent forwarding satellite and a regenerated forwarding satellite according to an embodiment of the present application;

fig. 6 is a schematic diagram of alignment of a downlink subframe and an uplink subframe on a network device side according to an embodiment of the present application;

fig. 7 is a schematic diagram of an offset value between a downlink subframe and an uplink subframe on a network device side according to an embodiment of the present application;

FIG. 8 is a diagram of a RAR structure corresponding to CEModeA of the present application;

FIG. 9 is a diagram of a RAR structure corresponding to CEModeB of the present application;

fig. 10 is a schematic diagram of an alternative processing flow of a random access method according to an embodiment of the present application;

fig. 11 is a timing chart of initiating random access by a terminal device according to an embodiment of the present application;

fig. 12 is a schematic diagram of an alternative processing flow of the method for determining an antenna polarization mode according to an embodiment of the present application;

fig. 13 is a schematic diagram of another alternative processing flow of the random access method according to the embodiment of the present application;

fig. 14 is a schematic diagram of another alternative processing flow of the method for determining an antenna polarization mode according to an embodiment of the present application;

Fig. 15 is a schematic diagram of an alternative composition structure of a terminal device according to an embodiment of the present application;

fig. 16 is a schematic diagram of another alternative composition structure of a terminal device according to an embodiment of the present application;

fig. 17 is a schematic diagram of an alternative composition structure of a network device according to an embodiment of the present application;

fig. 18 is a schematic diagram of another alternative composition structure of a network device according to an embodiment of the present application;

fig. 19 is a schematic diagram of a hardware composition structure of an electronic device according to an embodiment of the present application.

Detailed Description

So that the manner in which the features and techniques of the embodiments of the present application can be understood in more detail, a more particular description of the application, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the present application.

Before explaining the embodiments of the present application, the related contents will be briefly explained.

The third generation partnership project (3 rd Generation Partnership Project) is researching Non-terrestrial communication network (Non-Terrestrial Network, NTN) technology. NTN systems typically employ satellite communication to provide communication services to terrestrial subscribers. Satellite communications have many unique advantages over terrestrial cellular communications. Firstly, satellite communication is not limited by user regions, for example, general land communication cannot cover areas where communication equipment cannot be set up, such as oceans, mountains, deserts and the like, or communication coverage cannot be performed due to sparse population; for satellite communication, since one satellite can cover a larger area of the ground, and the satellite can orbit around the earth, theoretically every corner of the earth can be covered by satellite communication. And secondly, satellite communication has higher social value. Satellite communication can be covered in remote mountain areas, poor and backward countries or regions with lower cost, so that people in the regions enjoy advanced voice communication and mobile internet technology, and the digital gap between developed regions is reduced, and the development of the regions is promoted. Again, the satellite communication distance is far, and increasing the communication distance does not significantly increase the cost of communication; and finally, the satellite communication has high stability and is not limited by natural disasters.

Communication satellites are classified into Low Earth Orbit (LEO) satellites, medium Earth Orbit (MEO) satellites, geosynchronous Orbit (Geostationary Earth Orbit, GEO) satellites, and high elliptical Orbit (High Elliptical Orbit, HEO) satellites, etc., according to the Orbit heights. The LEO and GEO are briefly described below, respectively.

The LEO has a track height in the range of 500km to 1500km, with a corresponding track period of about 1.5 hours to 2 hours. The signal propagation delay for single hop communications between terminal devices is typically less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is less, and the requirement on the transmitting power of the terminal equipment is not high.

The track height of MEO ranges from about 8000km to 18000km, and the track period is about 5 to 10 hours. The signal propagation delay for single hop communications between terminal devices is typically less than 50ms and the maximum satellite visibility time is typically several hours.

The GEO orbit height was 35786km and the period of rotation around the earth was 24 hours. The signal propagation delay for single hop communications between terminal devices is typically 250ms.

In order to ensure the coverage of the satellite and improve the system capacity of the whole satellite communication system, the satellite adopts multiple beams to cover the ground, and one satellite can form tens or hundreds of beams to cover the ground; a satellite beam may cover a ground area of several tens to hundreds of kilometers in diameter.

Fig. 1 is a schematic diagram of an application scenario according to an embodiment of the present application. As shown in fig. 1, communication system 100 may include a terminal device 110 and a network device 120. Network device 120 may communicate with terminal device 110 over the air interface. Multi-service transmission is supported between terminal device 110 and network device 120.

It should be understood that embodiments of the present application are illustrated by way of example only with respect to communication system 100, and embodiments of the present application are not limited thereto. That is, the technical solution of the embodiment of the present application may be applied to various communication systems, for example: long term evolution (Long Term Evolution, LTE) systems, LTE time division duplex (Time Division Duplex, TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), internet of things (Internet of Things, ioT) systems, narrowband internet of things (Narrow Band Internet of Things, NB-IoT) systems, enhanced Machine-type-Type Communications (eMTC) systems, 5G communication systems (also known as New Radio (NR) communication systems), or future communication systems, etc.

In the communication system 100 shown in fig. 1, the network device 120 may be an access network device in communication with the terminal device 110. The access network device may provide communication coverage for a particular geographic area and may communicate with terminal devices 110 (e.g., UEs) located within the coverage area.

The network device 120 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in a long term evolution (Long Term Evolution, LTE) system, or a next generation radio access network (Next Generation Radio Access Network, NG RAN) device, or a base station (gNB) in a NR system, or a radio controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device 120 may be a relay station, an access point, a vehicle device, a wearable device, a hub, a switch, a bridge, a router, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

Terminal device 110 may be any terminal device including, but not limited to, a terminal device that employs a wired or wireless connection with network device 120 or other terminal devices.

For example, the terminal device 110 may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, an IoT device, a satellite handset, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handset with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in a future evolution network, etc.

The terminal Device 110 may be used for Device-to-Device (D2D) communication.

The wireless communication system 100 may further comprise a core network device 130 in communication with the base station, which core network device 130 may be a 5G core,5gc device, e.g. an access and mobility management function (Access and Mobility Management Function, AMF), further e.g. an authentication server function (Authentication Server Function, AUSF), further e.g. a user plane function (User Plane Function, UPF), further e.g. a session management function (Session Management Function, SMF). Optionally, the core network device 130 may also be a packet core evolution (Evolved Packet Core, EPC) device of the LTE network, for example a session management function+a data gateway (Session Management Function + Core Packet Gateway, smf+pgw-C) device of the core network. It should be appreciated that SMF+PGW-C may perform the functions performed by both SMF and PGW-C. In the network evolution process, the core network device may also call other names, or form new network entities by dividing the functions of the core network, which is not limited in this embodiment of the present application.

Communication may also be achieved by establishing connections between various functional units in the communication system 100 through a next generation Network (NG) interface.

For example, the terminal device establishes an air interface connection with the access network device through an NR interface, and is used for transmitting user plane data and control plane signaling; the terminal equipment can establish control plane signaling connection with AMF through NG interface 1 (N1 for short); an access network device, such as a next generation radio access base station (gNB), can establish a user plane data connection with a UPF through an NG interface 3 (N3 for short); the access network equipment can establish control plane signaling connection with AMF through NG interface 2 (N2 for short); the UPF can establish control plane signaling connection with the SMF through an NG interface 4 (N4 for short); the UPF can interact user plane data with the data network through an NG interface 6 (N6 for short); the AMF may establish a control plane signaling connection with the SMF through NG interface 11 (N11 for short); the SMF may establish a control plane signaling connection with the PCF via NG interface 7 (N7 for short).

Fig. 1 exemplarily illustrates one base station, one core network device, and two terminal devices, alternatively, the wireless communication system 100 may include a plurality of base station devices and each base station may include other number of terminal devices within a coverage area, which is not limited by the embodiment of the present application.

The 3GPP is researching Non Terrestrial Network (NTN, non-terrestrial communication network device) technology, where NTN generally provides communication services to terrestrial users by way of satellite communications. Satellite communications have many unique advantages over terrestrial cellular communications. First, satellite communications are not limited by the user region, for example, general land communications cannot cover areas where communication devices cannot be installed, such as oceans, mountains, deserts, etc., or communication coverage is not performed due to rarity of population, while for satellite communications, since one satellite can cover a larger ground, and the satellite can orbit around the earth, theoretically every corner on the earth can be covered by satellite communications. And secondly, satellite communication has great social value. Satellite communication can be covered in remote mountain areas, poor and backward countries or regions with lower cost, so that people in the regions enjoy advanced voice communication and mobile internet technology, and the digital gap between developed regions is reduced, and the development of the regions is promoted. Again, the satellite communication distance is far, and the cost of communication is not obviously increased when the communication distance is increased; and finally, the satellite communication has high stability and is not limited by natural disasters.

NTN technology may be combined with various communication systems. For example, NTN technology may be combined with NR systems into NR-NTN systems. For another example, NTN technology may be combined with an internet of things IoT system into an IoT-NTN system. As an example, ioT-NTN systems may include NB-IoT-NTN systems and eMTC-NTN systems.

Fig. 2 is a schematic diagram of another architecture of a communication system according to an embodiment of the present application.

As shown in FIG. 2, including a terminal device 1101 and a satellite 1102, wireless communication may be provided between terminal device 1101 and satellite 1102. The network formed between terminal device 1101 and satellite 1102 may also be referred to as NTN. In the architecture of the communication system shown in FIG. 2, satellite 1102 may have the functionality of a base station and direct communication may be provided between terminal device 1101 and satellite 1102. Under the system architecture, satellite 1102 may be referred to as a network device. In some embodiments of the present application, a plurality of network devices 1102 may be included in a communication system, and other numbers of terminal devices may be included within the coverage area of each network device 1102, which embodiments of the present application are not limited in this regard.

Fig. 3 is a schematic architecture diagram of another communication system according to an embodiment of the present application.

As shown in fig. 3, the system comprises a terminal device 1201, a satellite 1202 and a base station 1203, wherein wireless communication can be performed between the terminal device 1201 and the satellite 1202, and communication can be performed between the satellite 1202 and the base station 1203. The network formed between the terminal device 1201, the satellite 1202 and the base station 1203 may also be referred to as NTN. In the architecture of the communication system shown in fig. 3, the satellite 1202 may not have the function of a base station, and communication between the terminal device 1201 and the base station 1203 needs to be relayed through the satellite 1202. Under such a system architecture, the base station 1203 may be referred to as a network device. In some embodiments of the present application, a plurality of network devices 1203 may be included in the communication system, and other number of terminal devices may be included in the coverage area of each network device 1203, which is not limited by the embodiment of the present application. The network device 1203 may be the network device 120 of fig. 1.

It should be appreciated that the satellites 1102 or 1202 include, but are not limited to:

low Earth Orbit (Low-Earth Orbit) LEO satellites, medium Earth Orbit (MEO) satellites, geosynchronous Orbit (Geostationary Earth Orbit, GEO) satellites, high elliptical Orbit (High Elliptical Orbit, HEO) satellites, and the like. Satellites may cover the ground with multiple beams, e.g., a satellite may form tens or even hundreds of beams to cover the ground. In other words, one satellite beam may cover a ground area of several tens to hundreds of kilometers in diameter to ensure satellite coverage and to increase the system capacity of the overall satellite communication system.

As an example, the LEO may have a height ranging from 500km to 1500km, a corresponding orbital period of about 1.5 hours to 2 hours, a signal propagation delay for single hop communication between users may generally be less than 20ms, a maximum satellite visibility time may be 20 minutes, a signal propagation distance of the LEO is short and a link loss is small, and a transmission power requirement of a user terminal is not high. The orbit height of GEO may be 35786km, the period of rotation around the earth may be 24 hours, and the signal propagation delay for single hop communication between users may typically be 250ms.

It should be noted that fig. 1 to 3 illustrate, by way of example, a system to which the present application is applied, and of course, the method shown in the embodiment of the present application may be applied to other systems. Furthermore, the terms "system" and "network" are often used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship. It should also be understood that, in the embodiments of the present application, the "indication" may be a direct indication, an indirect indication, or an indication having an association relationship. For example, a indicates B, which may mean that a indicates B directly, e.g., B may be obtained by a; it may also indicate that a indicates B indirectly, e.g. a indicates C, B may be obtained by C; it may also be indicated that there is an association between a and B. It should also be understood that "corresponding" mentioned in the embodiments of the present application may mean that there is a direct correspondence or an indirect correspondence between the two, may mean that there is an association between the two, and may also be a relationship between an instruction and an indicated, configured, or the like. It should also be understood that "predefined" or "predefined rules" mentioned in the embodiments of the present application may be implemented by pre-storing corresponding codes, tables or other manners in which related information may be indicated in devices (including, for example, terminal devices and network devices), and the present application is not limited to the specific implementation thereof. Such as predefined may refer to what is defined in the protocol. It should be further understood that, in the embodiment of the present application, the "protocol" may refer to a standard protocol in the field of communications, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied in a future communication system, which is not limited by the present application.

Satellites can be categorized into transmission-through forwarding (transparent payload) and regenerative forwarding (regenerative payload) from the functions they provide. For the transparent transmission forwarding satellite, only the functions of wireless frequency filtering, frequency conversion and amplification are provided, only the transparent forwarding of signals is provided, and the waveform signals forwarded by the transparent transmission forwarding satellite are not changed. For regenerative repeater satellites, in addition to providing functions of radio frequency filtering, frequency conversion and amplification, demodulation/decoding, routing/conversion, encoding/modulation functions may be provided, which have some or all of the functions of the base station.

In NTN, one or more gateways (Gateway) may be included for communication between satellites and terminals.

Fig. 4 and 5 show schematic diagrams of NTN scenarios based on a through-transmission-repeater satellite and a regenerative repeater satellite, respectively.

As shown in fig. 4, for the NTN scenario based on the transparent forwarding satellite, the gateway and the satellite communicate through a Feeder link (Feeder link), and the satellite and the terminal communicate through a service link (service link). As shown in fig. 5, for the NTN scenario based on regenerative forwarding satellites, communication is performed between satellites through inter-satellite (inter link), communication is performed between a gateway and satellites through Feeder links (Feeder links), and communication is performed between satellites and terminals through service links (service links).

The timing relationship of the NTN system is described below.

In terrestrial communication systems, the propagation delay of signal communications is typically less than 1ms. In NTN systems, due to the long communication distance between the terminal device and the satellite (or network device), the propagation delay of the signal communication is large, which may range from tens of milliseconds to hundreds of milliseconds, in particular in relation to the satellite orbit height and the type of service of the satellite communication. In order to handle the relatively large propagation delays, the timing relationship of NTN systems needs to be enhanced relative to NR systems.

In the NTN system, as in the NR system, the UE needs to consider the influence of Timing Advance (TA) when performing uplink transmission. The range of TA values is also relatively large due to the large propagation delay in the system. When the UE is scheduled to perform uplink transmission in the time slot n (or the subframe n), the UE considers round trip propagation delay, and transmits in advance during uplink transmission, so that a signal can be made to arrive at the network device side on the time slot n (or the subframe n) uplink on the network device side. Specifically, the timing relationship in the NTN system may include two cases, namely case 1 and case 2.

Fig. 6 is a schematic structural diagram of case 1 in a timing relationship of an NTN system provided by an embodiment of the present application.

As shown in fig. 6, for case 1, the downlink subframe and the uplink subframe on the network device side are aligned. Accordingly, in order to align the uplink transmission of the UE with the uplink subframe of the network device side when the uplink transmission reaches the network device side, the UE needs to use a larger TA value. In some cases, the TA value corresponds to the timing offset value Koffset.

Fig. 7 is a schematic block diagram of case 2 in the timing relationship of the NTN system provided in the embodiment of the present application.

As shown in fig. 7, for case 2, there is an offset value between the downlink subframe and the uplink subframe on the network device side. In this case, if the UE wants to align the uplink transmission of the UE with the uplink subframe of the network device side when it arrives at the network device side, the UE only needs to use a smaller TA value. In some cases, the TA value corresponds to the timing offset value Koffset. In other cases, the RTT of the UE corresponds to the timing offset value Koffset.

In IoT-NTN systems, the network device needs to send synchronization assistance information such as ephemeris information, satellite movement speed, and/or satellite position, etc., to the terminal device for the terminal device to complete time-domain and/or frequency-domain synchronization. Accordingly, the terminal device needs to read the synchronization assistance information sent by the network device, and simultaneously complete corresponding time domain and/or frequency domain synchronization according to own global satellite navigation system (Global Navigation Satellite System, GNSS) capabilities. Since the range of TA values may be large in IoT-NTN systems, in the random access procedure, before the terminal device sends the random access preamble sequence, it needs to perform TA pre-compensation according to the estimated TA information before sending the physical random access channel (Physical Random Access Channel, PRACH) sequence.

When the terminal device processes the idle state, if the terminal device receives a paging message or a Wake Up Signal (WUS), the terminal device needs to perform time-frequency synchronization after receiving the paging message or the WUS, and then perform transmission, for example, initiate a random access procedure.

In addition, in IoT-NTN scenarios, the antenna polarization mode of the satellite may include one of right-hand polarization (Right Hand Circular Polarization, RHCP), left-hand polarization (Left Hand Circular Polarization, LHCP), and linear polarization (Linear Polarization, LP). The antenna polarization mode of the terminal device also includes one of right-hand polarization, left-hand polarization and linear polarization.

The random access procedure is briefly described below. The random access procedure of the terminal device may include four steps:

in a first step, the terminal device sends a random access Preamble sequence (also referred to as Message 1, msg 1) to the network device according to the determined random access parameter. In eMTC systems, the Preamble may be repeated and frequency hopped. For each coverage enhancement level, the PRACH parameter configured by the network device includes the Preamble retransmission times and an indication of whether to perform frequency hopping transmission.

In the second step, after detecting that the terminal device sends the Access preamble sequence, the network device sends a Random Access response (RAR, that is, message 2, msg 2) to the terminal device to inform the terminal device that the Message 3 (Message 3, msg 3) can use uplink resource information, allocates a temporary RNTI to the terminal device, provides a timing advance command to the terminal device, and the like, and correspondingly, the terminal device detects the Random Access response (Random Access Response, RAR) according to Random Access (RA) -radio network device temporary identifier (Radio Network Temporary Identifier, RNTI). If the terminal equipment does not detect RAR in the RAR window, the terminal equipment carries out retransmission of the PRACH sequence, and if the terminal equipment detects RAR in the RAR window, the terminal equipment carries out transmission of Msg3 according to RAR Uplink (UL) authorization (grant) indicated by the RAR.

Third, after receiving the RAR, the terminal device sends an Msg3 message in the uplink resource specified by the random access response message, which allows for hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) retransmission. If the PRACH parameters determined by the terminal equipment correspond to the coverage enhancement levels 0 and 1, the RAR content is analyzed according to the format of CEModeA; if the PRACH parameters determined by the terminal equipment correspond to coverage enhancement levels 2 and 3, the RAR content is analyzed according to the CEModeB format.

Terminal devices in eMTC systems are also referred to as narrowband low complexity (Bandwidth reduced Low complexity, BL)/coverage enhancement (Coverage Enhancement, CE) terminal devices (UE). BL/CE UE includes CEModeA and CEModeB modes. The bandwidth received and transmitted by BL/CE UE is narrow band, comprising 6 continuous RBs in the bandwidth of LTE cell. If the bandwidth of the LTE cell is greater than 6 RBs, a plurality of narrow bands may be included in the LTE cell bandwidth. Each narrowband corresponds to a narrowband number.

The RAR structure corresponding to CEModeA is shown in FIG. 8. Wherein R is a reserved bit of 1 bit, the TA command includes 11 bits, the uplink grant (i.e., RAR UL grant) includes 20 bits, and the TC-RNTI includes 16 bits.

The RAR structure corresponding to CEModeB is shown in fig. 9. Wherein R is a reserved bit of 1 bit, the TA command includes 11 bits, the uplink grant (i.e., RAR UL grant) includes 12 bits, and the TC-RNTI includes 16 bits.

Fourth, the network device sends an Msg4 message to the terminal device, where the Msg4 message includes a contention resolution message, and allocates uplink transmission resources to the terminal device, which allows HARQ retransmission. When the terminal equipment receives the Msg4 sent by the network equipment, the terminal equipment detects whether the Msg4 comprises part of the content in the Msg2 message sent by the terminal equipment. If so, the terminal equipment indicates that the random access process is successful, otherwise, the random access process is considered to be failed, and the terminal equipment needs to initiate the random access process from the first step again.

In IoT-NTN systems, when the terminal device processes the idle state, if the terminal device receives the paging message or the WUS, the terminal device needs to perform time-frequency synchronization after receiving the paging message or the WUS, and then perform uplink and downlink transmission, for example, initiate a random access procedure. Since time-frequency synchronization of terminal devices in IoT-NTN systems needs to read synchronization auxiliary information such as ephemeris information, satellite moving speed, and/or satellite position, etc., which are sent by network devices through, for example, system messages, multiple terminal devices that are awakened in different times may read the same system message carrying the synchronization auxiliary information, so that the multiple terminal devices have a high probability of selecting the same PRACH resource to send a random access preamble sequence, and thus may send a PRACH collision.

In addition, in IoT-NTN scenarios, a deployment scenario may occur in which neighboring cells use different polarization modes, thereby mitigating inter-cell interference. If the antenna polarization modes of the satellite and the terminal equipment are matched, the receiving performance can be increased; if the antenna polarization patterns of the satellite and the terminal device do not match, the reception performance may be degraded or even the signal may not be received. Therefore, the antenna polarization mode needs to be notified in both downlink and uplink transmissions in IoT-NTN scenarios.

It should be understood that, in various embodiments of the present application, the size of the sequence number of each implementation process does not mean that the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

An optional processing flow of the random access method provided by the embodiment of the present application, as shown in fig. 10, may at least include the following steps:

step S201, a terminal device obtains first indication information, where the first indication information includes: back-off indication information and/or offset value indication information.

In some embodiments, the terminal device may receive the first indication information sent by the network device, and the terminal device may also obtain the first indication information according to a predefined rule. As an example, if the terminal device receives the first indication information sent by the network device, the first indication information may be carried by at least one of a system message, a paging message, a wake-up signal, a radio resource control (Radio Resource Control, RRC) signaling, a medium access control unit (Media Access Control Control Element, MAC CE) and downlink control information (Downlink Control Information, DCI); the system message may also include ephemeris information, and the system message may be an NTN-specific system message.

In some embodiments, the backoff indication information and the offset value indication information may be carried in the same information or may be carried in different information. As an example, the first indication information is a paging message, where the paging message carries the backoff indication information and the offset value indication information. As another example, the first indication information includes a system message and wake-up indication information, where the system message carries the back-off indication information, and the wake-up indication information carries the offset value indication information.

In some embodiments, the first indication information includes at least one fallback indication information (Backoff Indicator, BI), each of the fallback indication information corresponding to one first fallback parameter. Optionally, the BI may be used to determine the loading situation of the cell.

In some embodiments, the back-off indication information may include 4 bits, and as one example, the back-off parameters indicated by the back-off indication information may be as shown in table 1 below; if the terminal equipment determines that the back-off indication information indicates '10', the terminal equipment determines that the back-off parameter value is 320ms; if the terminal device determines that the backoff indication information indicates "Reserved", the terminal device determines that the backoff parameter value is the maximum value 960ms shown in table 1.

TABLE 1

Index	Backoff Parameter value(ms)
0	0
1	10
2	20
3	30
4	40
5	60
6	80
7	120
8	160
9	240
10	320
11	480
12	960
13	Reserved
14	Reserved
15	Reserved

In some embodiments, the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters. As an example, the at least one fallback indication information may have a first correspondence with at least one coverage enhancement level; alternatively, the at least one back-off indication information may have a first correspondence with at least one set of random access parameters; or, the at least one back-off indication information has a first correspondence with at least one coverage enhancement level and at least one set of random access parameters.

In some embodiments, the first correspondence includes one of: one back-off indication information corresponds to one coverage enhancement level and/or a set of random access parameters, one back-off indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters, and at least two back-off indication information corresponds to one coverage enhancement level and/or a set of random access parameters. For example, the first correspondence may be that the first back-off indication information corresponds to a coverage enhancement level of 0 and a first random access parameter; the first correspondence may also be that the first backoff indicator information corresponds to a coverage enhancement level 0 and a first random access parameter, and that the first backoff indicator information corresponds to a coverage enhancement level 1 and a second random access parameter; the first correspondence may also be that the first backoff indication information and the second backoff indication information both correspond to a coverage enhancement level of 0 and a first random access parameter. As an example of one fallback indication information corresponding to one coverage enhancement level, the first indication information includes 4 fallback indication information, as an example, fallback indication information 1 corresponds to coverage enhancement level 0, fallback indication information 2 corresponds to coverage enhancement level 1, fallback indication information 3 corresponds to coverage enhancement level 2, and fallback indication information 4 corresponds to coverage enhancement level 3.

In some embodiments, the first correspondence is obtained by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI; or, the first correspondence is obtained according to a predefined rule. For example, the first correspondence may be carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI. As an example, the system message may also include ephemeris information, which may be an NTN-specific system message.

In some optional embodiments, the terminal device may determine a second backoff parameter according to the backoff indication information and/or the offset value indication information.

In some optional embodiments, the determining, by the terminal device, a second backoff parameter according to the backoff indication information and/or the offset value indication information may include:

in step S1a, the terminal device determines a first coverage enhancement level and/or a first set of random access parameters.

In some embodiments, the terminal device may determine the first coverage enhancement level and/or the first set of random access parameters corresponding to the terminal device according to a capability of the terminal device.

In other embodiments, the terminal device may also determine the first coverage enhancement level and/or the first set of random access parameters based on RSRP measurements.

For example, in eMTC system, the terminal device may determine which set of PRACH parameters to use to initiate random access according to indication information sent by the network device, such as the higher layer parameters or indication information in PDCCH order. Or if the network device does not send the indication information for indicating the PRACH parameter, the terminal device can select the PRACH parameter corresponding to the proper coverage enhancement level according to the current measured RSRP and the configured RSRP threshold to initiate random access. The network device may configure 4 sets of random access parameters for the system, corresponding to coverage enhancement levels (coverage enhancement level) 0, 1, 2, 3, respectively. As an example, a scene with the best signal strength corresponding to enhancement level 0 is overlaid, and a scene with the worst signal strength corresponding to enhancement level 3 is overlaid. The terminal devices corresponding to the coverage enhancement levels 0 and 1 support CEModeA, and the terminal devices corresponding to the coverage enhancement levels 2 and 3 support CEModeB. Accordingly, the network device configures an RSRP threshold 3, an RSRP threshold 2, and an RSRP threshold 1.

The following describes a scenario in which the terminal device supports CEModeA and the terminal device supports CEModeB, respectively, for determining coverage enhancement levels for the terminal device.

If the terminal device supports CEModeB (i.e. the terminal device supports coverage enhancement levels 2 and 3), the terminal device may select a random access parameter corresponding to a suitable coverage enhancement level according to the current measured RSRP and the configured RSRP threshold to initiate random access. If the measured RSRP is smaller than the RSRP threshold 3, the terminal equipment determines a coverage enhancement level 3; or if the measured RSRP is less than RSRP threshold 2, the terminal device determines coverage enhancement level 2; or if the measured RSRP is smaller than the RSRP threshold 1, the terminal device determines a coverage enhancement level 1; otherwise, the terminal device determines a coverage enhancement level of 0.

If the terminal device supports CEModeA and does not support CEModeB (i.e. the terminal device supports coverage enhancement levels 1 and 0), the terminal device may select a PRACH parameter corresponding to a suitable coverage enhancement level according to the current measured RSRP and the configured RSRP threshold to initiate random access. If the measured RSRP is smaller than the RSRP threshold 1, the terminal equipment determines a coverage enhancement level 1; otherwise, the terminal device determines a coverage enhancement level of 0.

After determining the coverage enhancement level, the terminal device may determine the random access parameter according to the correspondence between the coverage enhancement level and the random access parameter.

In some embodiments, the terminal device may further determine the first coverage enhancement level and/or the first set of random access parameters according to second indication information sent by the network device; the second indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, MAC CE, and DCI. As an example, the system message may further include ephemeris information, and the system message may be an NTN-specific system message, and the second indication information is determined according to a capability reported by the terminal device. As an example, the network device determines second indication information according to the capability reported by the terminal device, where the second indication information is used by the terminal device to determine the first coverage enhancement level and/or the first set of random access parameters; the network device then sends the second indication information to the terminal device.

Step S1b, the terminal device determines, based on the first correspondence, the first coverage enhancement level and/or the first backoff parameter corresponding to the first set of random access parameters in the at least one backoff indication information.

For example, the terminal device determines the first correspondence as shown in table 2 through a system message, a paging message, a wake-up signal, RRC signaling, MAC CE, or DCI, or according to a predefined rule, the back-off indication information 1 corresponds to a coverage enhancement level 0 and a random access parameter set 1, the back-off indication information 2 corresponds to a coverage enhancement level 1 and a random access parameter set 2, the back-off indication information 3 corresponds to a coverage enhancement level 2 and a random access parameter set 3, and the back-off indication information 4 corresponds to a coverage enhancement level 3 and a random access parameter set 4.

TABLE 2

Coverage enhancement level	Random access parameter configuration	Rollback indication information
0	Random access parameter set 1	Rollback indication information 1
1	Random access parameter set 2	Back-off indication information 2
2	Random access parameter set 3	Rollback indication information 3
3	Random access parameter set 4	Back-off indication information 4

If the first coverage enhancement level and the first set of random access parameters determined in step S1a are the coverage enhancement level 0 and the random access parameter set 1, respectively, the terminal device determines that the first backoff parameter is a value corresponding to the backoff indication information 1; if the first coverage enhancement level and the first set of random access parameters determined in step S1a are the coverage enhancement level 1 and the random access parameter set 2, respectively, the terminal device determines that the first backoff parameter is a value corresponding to the backoff indication information 2; if the first coverage enhancement level and the first set of random access parameters determined in step S1a are the coverage enhancement level 2 and the random access parameter set 3, respectively, the terminal device determines that the first backoff parameter is a value corresponding to the backoff indication information 3; if the first coverage enhancement level and the first set of random access parameters determined in step S1a are the coverage enhancement level 3 and the random access parameter set 4, respectively, the terminal device determines that the first backoff parameter is a value corresponding to the backoff indication information 4.

The above description has been given of alternative implementations of determining the first backoff parameter by the terminal device, and the following description describes alternative implementations of determining the first offset value by the terminal device.

In some embodiments, the first indication information may include at least one offset value, the at least one offset value being used to determine the first offset value.

In some examples, the first offset value corresponds to a timing advance offset (TA). In other examples, the first offset value corresponds to a Round Trip Time (RTT).

In some embodiments, the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters. The second correspondence may include one of: an offset value corresponds to a coverage enhancement level and/or a set of random access parameters; one offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters; at least two offset values correspond to a coverage enhancement level and/or a set of random access parameters. As an example, the second correspondence may be obtained through at least one of a system message, a paging message, a wake-up signal, RRC signaling, MAC CE, and DCI, and as an example, the second correspondence may be carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, MAC CE, and DCI; or the second corresponding relation is obtained according to a predefined rule.

For example, an offset value of 0 corresponds to a coverage enhancement level of 0 and a random access parameter of 1. Alternatively, offset value 0 corresponds to coverage enhancement level 0 and random access parameter 1, and offset value 0 corresponds to coverage enhancement level 1 and random access parameter 2. Alternatively, an offset value of 0 corresponds to a coverage enhancement level of 0 and a random access parameter of 1, and an offset value of 1 corresponds to a coverage enhancement level of 0 and a random access parameter of 1.

In some optional embodiments, the terminal device acquiring the first backoff parameter and/or the first offset value based on the first indication information may include:

step S1c, the terminal device determines a first coverage enhancement level and/or a first set of random access parameters.

In some embodiments, the process of determining the first coverage enhancement level and/or the first set of random access parameters by the terminal device may be the same as the process of determining the first coverage enhancement level and/or the first set of random access parameters by the terminal device in step S1a, which is not described herein.

Step S1d, the terminal device determines, based on the second correspondence, the first coverage enhancement level and/or the first offset value corresponding to the first set of random access parameters in the at least one offset value.

In some embodiments, the second correspondence may be as shown in table 3 below, and if the terminal device determines that the coverage enhancement level 0 and the random access parameter set 1, the terminal device determines that the first offset value is an offset value 1 according to the second correspondence; if the terminal equipment determines that the coverage enhancement level 1 and the random access parameter set 2 are the coverage enhancement level 1, the terminal equipment determines that the first offset value is the offset value 2 according to the second corresponding relation; if the terminal equipment determines that the coverage enhancement level 2 and the random access parameter set 3 are covered, the terminal equipment determines that the first offset value is the offset value 3 according to the second corresponding relation; if the terminal equipment determines that the coverage enhancement level 3 and the random access parameter set 4 are the coverage enhancement level, the terminal equipment determines that the first offset value is the offset value 4 according to the second corresponding relation.

TABLE 3 Table 3

Coverage enhancement level	Random access parameter configuration	First offset value
0	Random access parameter set 1	Offset value 1
1	Random jointEnter parameter set 2	Offset value 2
2	Random access parameter set 3	Offset value 3
3	Random access parameter set 4	Offset value 4

In step S1e, the terminal device determines a second backoff parameter based on the first backoff parameter and the first offset value.

In some embodiments, the terminal device determines a first back-off parameter value according to the first back-off parameter, randomly selects a first back-off time from values uniformly distributed between 0 and the first back-off parameter value, and shifts a first offset value forward or backward from the first back-off time to obtain a second back-off parameter value.

In other embodiments, the terminal device determines a first backoff parameter value based on the first backoff parameter, randomly selects a first backoff time from values uniformly distributed between 0 and the first backoff parameter value, and uses the first backoff time as a second backoff parameter value.

In further embodiments, the terminal device determines a first back-off parameter value based on the first back-off parameter, randomly selects a first back-off time from 0 and a value evenly distributed between the sum of the first back-off parameter value and the first offset value, and takes the first back-off time as a second back-off parameter value.

Step S202, the terminal device initiates random access based on the first backoff parameter and/or the first offset value indication information.

In some embodiments, the terminal device determines a second backoff parameter based on the first backoff parameter and/or the first offset value indication information, and the terminal device initiates random access based on the second backoff parameter; as an example, the terminal device determines a first PRACH resource based on the second backoff parameter; and the terminal equipment sends the PRACH on the first PRACH resource. As an example, the terminal device determines a back-off parameter according to the back-off indication information and/or the offset value indication information, wherein the offset value indication information is used for indicating a first offset value; and the terminal equipment initiates random access according to the rollback parameter.

In some embodiments, the determining, by the terminal device, the first PRACH resource based on the second backoff parameter may comprise at least one of:

the terminal equipment determines a first backoff parameter value based on the first backoff parameter, randomly selects a first backoff time from values uniformly distributed between 0 and the first backoff parameter value, takes the first backoff time as a second backoff parameter value, and determines the first PRACH resource based on the second backoff parameter value. For example, the first PRACH resource is the first available PRACH resource after passing the second backoff parameter value.

Or the terminal equipment determines a first back-off parameter value based on the first back-off parameter, randomly selects first back-off time from values uniformly distributed between 0 and the first back-off parameter value, and shifts a first offset value forwards or backwards from the first back-off time to obtain a second back-off parameter value; the first PRACH resource is determined based on the second backoff parameter value. As an example, the terminal device determining the first PRACH resource based on the second backoff parameter value may be that the terminal device selects the first PRACH resource based on a first offset value that is shifted forward or backward by a first backoff time. For example, the first PRACH resource is the first available PRACH resource after passing the second backoff parameter value.

Or the terminal equipment determines a first back-off parameter value based on the first back-off parameter, randomly selects a first back-off time from 0 and a value uniformly distributed between the sum of the first back-off parameter value and the first offset value, takes the first back-off time as a second back-off parameter value, and determines the first PRACH resource based on the second back-off parameter value. For example, the first PRACH resource is the first available PRACH resource after passing the second backoff parameter value.

As shown in fig. 11, if the network device indicates a first offset value through a system message and indicates a backoff parameter value through a paging message, the terminal device randomly selects a first backoff time from uniformly distributed values between 0 and the backoff parameter value, obtains a time T after considering the first offset value, and initiates random access after the time T.

The following illustrates the process flow of the random access method provided in the embodiment of the present application.

If the terminal equipment determines that the coverage enhancement level is 3, the terminal equipment can determine the rollback indication information 4 and the offset value 4 according to the tables 2 and 3, determine the rollback parameter 4 based on the rollback indication information 4, and select a random rollback time, such as T4, from the values uniformly distributed between 0 and the rollback parameter 4; extending the subsequent random access transmission by a time T4; after considering the offset value 4, the selection of the random access resource is performed according to the set of random access parameters 4.

If the terminal equipment determines that the coverage enhancement level is 2, the terminal equipment can determine the rollback indication information 3 and the offset value 3 according to the tables 2 and 3, determine the rollback parameter 3 based on the rollback indication information 3, and select a random rollback time, such as T3, from the values uniformly distributed between 0 and the rollback parameter 3; extending the subsequent random access transmission by a time T3; after considering the offset value 3, the selection of the random access resource is performed according to the random access parameter set 3.

If the terminal equipment determines that the coverage enhancement level is 1, the terminal equipment can determine the rollback indication information 2 and the offset value 2 according to the tables 2 and 3, determine the rollback parameter 2 based on the rollback indication information 2, and select a random rollback time, such as T2, from the values uniformly distributed between 0 and the rollback parameter 2; extending the subsequent random access transmission by a time T2; after considering the offset value 2, the selection of the random access resource is performed according to the random access parameter set 2.

If the terminal equipment determines that the coverage enhancement level is 0, the terminal equipment can determine the rollback indication information 1 and the offset value 1 according to the table 2 and the table 3, determine the rollback parameter 1 based on the rollback indication information 1, and select a random rollback time, such as T1, from the values uniformly distributed between 0 and the rollback parameter 1; extending the subsequent random access transmission by a time T1; after considering the offset value 1, the random access resource is selected according to the random access parameter set 1.

In some examples, if the terminal device determines that the coverage enhancement level x corresponds (x is 0 or 1 or 2 or 3), the terminal device may determine the backoff indication information y (y is 1 or 2 or 3 or 4) according to table 2, determine the backoff parameter y based on the backoff indication information y, and select a random backoff time, such as Ty, from the values uniformly distributed between 0 and the backoff parameter y; extending the Ty time for subsequent random access transmissions; and selecting random access resources according to the random access parameter set y.

In some examples, if the terminal device determines that the coverage enhancement level x corresponds (x is 0 or 1 or 2 or 3), the terminal device may determine the backoff indication information y and the offset value y (y is 1 or 2 or 3 or 4) according to table 2 and table 3, determine the backoff parameter y based on the backoff indication information y, select a random backoff time from the values uniformly distributed between 0 and the backoff parameter y, and increase or decrease the random backoff time by the offset value y to obtain Ty; extending the Ty time for subsequent random access transmissions; and selecting random access resources according to the random access parameter set y.

According to the random access method provided by the embodiment of the application, the terminal equipment determines the first indication information according to the predefined rule, or the terminal equipment receives the first indication information sent by the network equipment; the terminal equipment can determine a first rollback parameter and/or a first offset value according to the first indication information; after the idle terminal equipment performs time-frequency synchronization based on the paging message or the wake-up signal, the idle terminal equipment does not directly select random access resources to initiate random access, but determines a back-off time according to a first back-off parameter and/or a first offset value determined by the first indication information, and prolongs the back-off time of subsequent random access transmission. In this way, the success rate and the efficiency of random access can be improved, and the situation that in an IoT-NTN system, as a plurality of terminal devices awakened in different time may read the same system message carrying synchronization auxiliary information, the plurality of terminal devices have a high probability of selecting the same PRACH resource to transmit the random access preamble sequence to generate PRACH collision is avoided.

It should be noted that, the random access method provided by the embodiment of the present application may be applied to an initial random access procedure.

An optional processing flow of the method for determining an antenna polarization mode according to the embodiment of the present application, as shown in fig. 12, may at least include the following steps:

in step S301, the terminal device obtains an antenna polarization mode based on third indication information, where the third indication information is used to determine the antenna polarization mode.

In some embodiments, the terminal device obtains the third indication information according to a predefined rule; or the terminal equipment receives the third indication information sent by the network equipment. As an example, the third indication information may be determined by a predefined rule or sent by the network device to the terminal device.

In some embodiments, the third indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI. Optionally, the system message may further include ephemeris information; the system message may be an NTN-specific system message.

In some embodiments, the antenna polarization mode may include: the downlink antenna polarization mode and the uplink antenna polarization mode have a first association relation.

In some embodiments, the first association may include: the polarization mode of the downlink antenna is the same as that of the uplink antenna; and/or, the first association is carried by at least one of a system message, a paging message, a wake-up signal, an RRC signaling, an MAC CE and DCI; or the second association relation is obtained according to a predefined rule. Optionally, the system message may further include ephemeris information; the system message may be an NTN-specific system message.

In some embodiments, the downlink antenna polarization mode may include at least one of: right-hand polarization (Right Hand Circular Polarization, RHCP), left-hand polarization (Left Hand Circular Polarization, LHCP) and linear polarization (Linear Polarization, LP). As an example, the uplink antenna polarization mode includes at least one of: right-hand polarization, left-hand polarization, and linear polarization.

In some embodiments, the third indication information may be used to indicate that the antenna polarization mode is right-hand polarization or left-hand polarization. If the third indication information does not indicate the antenna polarization mode, the antenna polarization mode may be linear polarization.

In some embodiments, the third indication information is used to determine an antenna polarization mode, including one of: the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode; the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode; the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration; the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration and the third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.

In some embodiments, the antenna polarization pattern has a second association with a cell ID; for example, the network device indicates that the cell with cell ID module 2 of 0 corresponds to RHCP, and the cell with cell ID module 2 of 1 corresponds to LHCP. For another example, the network device indicates that the cell with cell ID module 2 of 0 corresponds to LHCP, and the cell with cell ID module 2 of 1 corresponds to RHCP.

In some embodiments, the second association may be carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI; alternatively, the second association relationship may be obtained according to a predefined rule. Optionally, the system message may further include ephemeris information; the system message may be an NTN-specific system message.

In some embodiments, the second association is for radio resource management (Radio Resource Management, RRM) measurements and/or radio link monitoring (Radio Link Monitoring, RLM) measurements of the neighbor. For example, the network device may indicate the antenna polarization mode of the neighboring cell through a system message or RRC signaling or MAC CE or DCI, for example, indicate the association relationship between the antenna polarization mode and the cell ID, and the terminal device may perform RRM measurement of the neighboring cell according to the indicated association relationship.

In some embodiments, the network device may configure whether circular polarization is supported, and if so, the second association relationship may be predefined, e.g., a cell association RHCP with an odd cell ID and a cell association LHCP with an even cell ID; alternatively, if circular polarization is not supported, the antenna polarization mode is LP.

In some embodiments, the second association may represent an association of the uplink antenna polarization mode with the cell ID. For example, the network device may indicate { cell ID 0, uplink polarization mode 0}, { cell ID 1, uplink polarization mode 1}, { cell ID 2, uplink polarization mode 2}. If the terminal equipment accesses the network equipment through the cell 0, adopting a corresponding uplink polarization mode 0 to perform data transmission; or if the terminal equipment accesses the network equipment through the cell 1, adopting the corresponding uplink polarization mode 1 to transmit data; or if the terminal equipment accesses the network equipment through the cell 2, adopting the corresponding uplink polarization mode 2 to perform data transmission.

In the embodiment of the application, the terminal equipment receives the third indication information sent by the network equipment or acquires the third indication information according to the predefined rule, and the terminal equipment determines the antenna polarization mode based on the third indication information, so that the polarization modes of the network equipment (such as a satellite) and the terminal equipment are matched, and the performances of receiving data and sending data of the system are improved.

An alternative process flow of the random access method provided by the embodiment of the present application, as shown in fig. 13, includes the following steps:

in step S401, the network device sends first indication information to the terminal device, where the first indication information includes back-off indication information and/or offset value indication information, where the back-off indication information and/or the offset value indication information is used for the terminal device to initiate random access.

In some embodiments, the first indication information, the first backoff parameter and/or the first offset value indication information are determined, and the description that the terminal device initiates the random access based on the first backoff parameter and/or the first offset value indication information is the same as the related description in the embodiment shown in fig. 10, which is not repeated herein.

An alternative process flow of the antenna polarization mode determining method provided by the embodiment of the present application, as shown in fig. 14, may at least include the following steps:

in step S501, the network device sends third indication information to the terminal device, where the third indication information is used to determine an antenna polarization mode.

In some embodiments, the description for determining the antenna polarization mode according to the third indication information and the terminal device based on the third indication information is the same as the related description in the embodiment shown in fig. 12, and will not be repeated here.

It should be noted that in the embodiments of the present application, the terminal device may be an N-IoT terminal device or an eMTC terminal device.

In order to implement the random access method provided by the embodiment of the present application, the embodiment of the present application further provides a terminal device, and an optional composition structure of the terminal device 600 is shown in fig. 15, and includes:

the first processing unit 601 is configured to obtain first indication information, where the first indication information includes: back-off indication information and/or offset value indication information;

The first sending unit 602 is configured to initiate random access according to the back-off indication information and/or the offset value indication information.

In some embodiments, the first processing unit 601 is configured to obtain the first indication information according to a predefined rule; or receiving the first indication information sent by the network equipment.

In some embodiments, the first processing unit 601 is configured to determine a second backoff parameter according to the backoff indication information and/or the offset value indication information, wherein the offset value indication information is used to indicate a first offset value;

and the terminal equipment initiates random access according to the second rollback parameter.

In some embodiments, the first indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.

In some embodiments, the first indication information includes one or more fallback indication information, each of the fallback indication information corresponding to one of the first fallback parameters.

In some embodiments, the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.

In some embodiments, the first correspondence includes one of:

one back-off indication information corresponds to one coverage enhancement level and/or a set of random access parameters;

one back-off indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two back-off indication information correspond to a coverage enhancement level and/or a set of random access parameters.

In some embodiments, the first correspondence is obtained by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI; or, the first correspondence is obtained according to a predefined rule.

In some embodiments, the first processing unit 601 is configured to determine a first coverage enhancement level and/or a first set of random access parameters; and determining the first coverage enhancement level and/or the first rollback parameter corresponding to the first set of random access parameters in the at least one rollback indication information based on the first correspondence.

In some embodiments, the offset value indication information includes at least one offset value, the at least one offset value being used to determine the first offset value.

In some embodiments, the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.

In some embodiments, the second correspondence includes one of:

an offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

one offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.

In some embodiments, the second correspondence is obtained through at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

or the second corresponding relation is obtained according to a predefined rule.

In some embodiments, the first processing unit 601 is configured to determine a first coverage enhancement level and/or a first set of random access parameters; and determining the first coverage enhancement level and/or the first offset value corresponding to the first set of random access parameters in the at least one offset value based on the second corresponding relation.

In some embodiments, the first processing unit 601 is configured to perform at least one of:

Determining the first coverage enhancement level and/or the first set of random access parameters corresponding to the terminal equipment according to the capability of the terminal equipment;

determining the first coverage enhancement level and/or the first set of random access parameters according to the RSRP measurement;

and determining the first coverage enhancement level and/or the first set of random access parameters according to second indication information sent by the network equipment.

In some embodiments, the second indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.

In some embodiments, the second indication information is determined according to the capability of reporting by the terminal device.

In some embodiments, the first transmitting unit 602 is configured to determine a first PRACH resource based on the first backoff parameter and/or the first offset value; and sending the PRACH on the first PRACH resource.

In some embodiments, the first transmitting unit 602 is configured to determine a first backoff parameter value based on the first backoff parameter, randomly select a first backoff time from values evenly distributed between 0 and the first backoff parameter value, and determine the first PRACH resource based on the first backoff time; or,

Determining a first backoff parameter value based on the first backoff parameter, randomly selecting a first backoff time from among values uniformly distributed between 0 and the first backoff parameter value, and determining the first PRACH resource based on the first backoff time and the first offset value; or,

a first backoff parameter value is determined based on the first backoff parameter, a first backoff time is randomly selected from 0 and a value uniformly distributed between the first backoff parameter value and a sum of the first offset values, and the first PRACH resource is determined based on the first backoff time.

In some embodiments, the backoff indication information and the offset value indication information may be carried in the same information; alternatively, the back-off indication information and the offset value indication information may be carried in different information.

In order to implement the method for determining the antenna polarization mode provided in the embodiment of the present application, another terminal device is further provided in the embodiment of the present application, where an optional composition structure of the terminal device 800, as shown in fig. 16, includes:

a second processing unit 801 is configured to obtain an antenna polarization mode based on third indication information, where the third indication information is used to determine the antenna polarization mode.

In some embodiments, the second processing unit 801 is configured to obtain the third indication information according to a predefined rule; or receiving the third indication information sent by the network equipment.

In some embodiments, the third indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.

In some embodiments, the antenna polarization mode comprises: a downlink antenna polarization mode and/or an uplink antenna polarization mode.

In some embodiments, the downlink antenna polarization mode and the uplink antenna polarization mode have a first association relationship.

In some embodiments, the first association relationship includes: the polarization mode of the downlink antenna is the same as that of the uplink antenna; and/or the number of the groups of groups,

the first association is carried by at least one of a system message, a paging message, a wake-up signal, an RRC signaling, a MAC CE, and DCI.

In some embodiments, the downlink antenna polarization mode includes at least one of: right-hand polarization, left-hand polarization, and linear polarization.

In some embodiments, the uplink antenna polarization mode includes at least one of: right-hand polarization, left-hand polarization, and linear polarization.

In some embodiments, the third indication information is used to indicate that the antenna polarization mode is right-hand polarization or left-hand polarization.

In some embodiments, if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.

In some embodiments, the antenna polarization pattern has a second association with a cell ID.

In some embodiments, the second association is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and a message DCI;

or the second association relation is obtained according to a predefined rule.

In some embodiments, the second association is used for RRM measurements and/or RLM measurements of the neighbor cell.

In some embodiments, the third indication information is used to determine an antenna polarization mode, including one of:

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

the third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.

In order to implement the random access method provided by the embodiment of the present application, the embodiment of the present application further provides a network device, where an optional composition structure of the network device 900, as shown in fig. 17, includes:

a second sending unit 901, configured to send first indication information to a terminal device, where the first indication information includes backoff indication information and/or offset value indication information, where the backoff indication information and/or the offset value indication information are used for the terminal device to initiate random access.

In some embodiments, the first indication information includes at least one fallback indication information, the at least one fallback indication information being used to determine the first fallback parameter.

In some embodiments, the first correspondence includes one of:

In some embodiments, the first correspondence is carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

or, the first correspondence is obtained according to a predefined rule.

In some embodiments, the second correspondence includes one of:

In some embodiments, the second correspondence is carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

In order to implement the method for determining the antenna polarization mode provided in the embodiment of the present application, another network device is further provided in the embodiment of the present application, where an optional composition structure of the network device 1000, as shown in fig. 18, includes:

a third sending unit 1001 is configured to send third indication information to the terminal device, where the third indication information is used to determine an antenna polarization mode.

the first association relationship is carried in at least one of a system message, a paging message, a wake-up signal, an RRC signaling, a MAC CE and DCI.

In some embodiments, the second association is carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

or the second association relation is obtained according to a predefined rule.

In some embodiments, the method third indication information is used to determine an antenna polarization mode, including one of:

The embodiment of the application also provides terminal equipment, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is used for executing the steps of the random access method executed by the terminal equipment when the computer program runs.

The embodiment of the application also provides a network device, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is used for executing the steps of the random access method executed by the network device when the computer program runs.

The embodiment of the application also provides a chip, which comprises: and the processor is used for calling and running the computer program from the memory, so that the device provided with the chip executes the random access method executed by the terminal device.

The embodiment of the application also provides a chip, which comprises: and the processor is used for calling and running the computer program from the memory, so that the device provided with the chip executes the random access method executed by the network device.

The embodiment of the application also provides a storage medium which stores an executable program, and when the executable program is executed by a processor, the random access method executed by the terminal equipment is realized.

The embodiment of the application also provides a storage medium which stores an executable program, and when the executable program is executed by a processor, the random access method executed by the network equipment is realized.

The embodiment of the application also provides a computer program product, which comprises computer program instructions, wherein the computer program instructions enable a computer to execute the random access method executed by the terminal equipment.

The embodiment of the application also provides a computer program product, which comprises computer program instructions, wherein the computer program instructions enable a computer to execute the random access method executed by the network equipment.

The embodiment of the application also provides a computer program, which enables a computer to execute the random access method executed by the terminal equipment.

The embodiment of the application also provides a computer program, which enables a computer to execute the random access method executed by the network equipment.

Fig. 19 is a schematic diagram of a hardware composition structure of an electronic device (a terminal device or a network device) according to an embodiment of the present application, and an electronic device 700 includes: at least one processor 701, memory 702, and at least one network interface 704. The various components in the electronic device 700 are coupled together by a bus system 705. It is appreciated that the bus system 705 is used to enable connected communications between these components. The bus system 705 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity of illustration, the various buses are labeled as bus system 705 in fig. 19.

It is to be appreciated that the memory 702 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Wherein the nonvolatile Memory may be ROM, programmable read-Only Memory (PROM, programmable Read-Only Memory), erasable programmable read-Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable read-Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic random access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk read-Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory 702 described in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The memory 702 in embodiments of the application is used to store various types of data to support the operation of the electronic device 700. Examples of such data include: any computer program for operating on the electronic device 700, such as application 7022. A program for implementing the method of the embodiment of the present application may be contained in the application program 7022.

The method disclosed in the above embodiment of the present application may be applied to the processor 701 or implemented by the processor 701. The processor 701 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 701 or by instructions in the form of software. The processor 701 may be a general purpose processor, a digital signal processor (DSP, digital Signal Processor), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The processor 701 may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present application. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiment of the application can be directly embodied in the hardware of the decoding processor or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium in a memory 702. The processor 701 reads information in the memory 702 and, in combination with its hardware, performs the steps of the method as described above.

In an exemplary embodiment, the electronic device 700 can be implemented by one or more application specific integrated circuits (ASIC, application Specific Integrated Circuit), DSP, programmable logic device (PLD, programmable Logic Device), complex programmable logic device (CPLD, complex Programmable Logic Device), FPGA, general purpose processor, controller, MCU, MPU, or other electronic components for performing the aforementioned methods.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It should be understood that the terms "system" and "network" are used interchangeably herein. The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

The above description is not intended to limit the scope of the application, but is intended to cover any modifications, equivalents, and improvements within the spirit and principles of the application.

Claims

A random access method, the method comprising:

the terminal equipment acquires first indication information, wherein the first indication information comprises: back-off indication information and/or offset value indication information;

and the terminal equipment initiates random access according to the back-off indication information and/or the offset value indication information.
The method according to claim 1, wherein the terminal device initiating random access according to the back-off indication information and/or the offset value indication information comprises:

the terminal equipment determines a second back-off parameter according to the back-off indication information and/or the offset value indication information, wherein the offset value indication information is used for indicating a first offset value;

and the terminal equipment initiates random access according to the second rollback parameter.
The method according to claim 1 or 2, wherein,

the first indication information comprises one or more pieces of rollback indication information, and each piece of rollback indication information corresponds to one first rollback parameter.
The method of claim 3, wherein the at least one back-off indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 4, wherein the first correspondence comprises one of:

one back-off indication information corresponds to one coverage enhancement level and/or a set of random access parameters;

one back-off indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two back-off indication information correspond to a coverage enhancement level and/or a set of random access parameters.
The method according to claim 4 or 5, wherein the first correspondence is obtained by at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, MAC CE, and downlink control information, DCI;

or, the first correspondence is obtained according to a predefined rule.
The method according to any one of claims 4 to 6, wherein,

the terminal equipment determines a first coverage enhancement level and/or a first set of random access parameters;

the terminal equipment determines the first coverage enhancement level and/or the first rollback parameter corresponding to the first set of random access parameters in the at least one rollback indication information based on the first corresponding relation.
The method of any of claims 1 to 7, wherein the offset value indication information comprises at least one offset value, the at least one offset value being used to determine the first offset value.
The method of claim 8, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 9, wherein the second correspondence comprises one of:

an offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

one offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The method of claim 9 or 10, wherein the second correspondence is obtained by at least one of a system message, a paging message, a wake-up signal, RRC signaling, MAC CE, and DCI;

or the second corresponding relation is obtained according to a predefined rule.
The method according to any one of claims 8 to 11, wherein,

the terminal equipment determines a first coverage enhancement level and/or a first set of random access parameters;

The terminal equipment determines the first coverage enhancement level and/or the first offset value corresponding to the first set of random access parameters in the at least one offset value based on the second corresponding relation.
The method according to claim 7 or 12, wherein the terminal device determines a first coverage enhancement level and/or a first set of random access parameters, comprising at least one of:

the terminal equipment determines the first coverage enhancement level and/or the first group of random access parameters corresponding to the terminal equipment according to the capability of the terminal equipment;

the terminal equipment determines the first coverage enhancement level and/or the first set of random access parameters according to the measurement result of Reference Signal Received Power (RSRP);

and the terminal equipment determines the first coverage enhancement level and/or the first group of random access parameters according to second indication information sent by the network equipment.
The method of claim 13, wherein the second indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.
The method according to claim 13 or 14, wherein the second indication information is determined according to a capability reported by the terminal device.
The method according to any of claims 1 to 15, wherein the terminal device initiates random access according to the back-off indication information and/or the offset value indication information, comprising:

the terminal equipment determines a first physical random access channel PRACH resource based on the back-off indication information and/or the offset value indication information;

and the terminal equipment sends the PRACH on the first PRACH resource.
The method of claim 16, wherein the terminal device determining a first physical random access channel, PRACH, resource based on the back-off indication information and/or the offset value indication information, comprises:

the terminal equipment determines a first back-off parameter value based on the back-off indication information, randomly selects a first back-off time from values uniformly distributed between 0 and the first back-off parameter value, and determines the first PRACH resource based on the first back-off time; or,

the terminal equipment determines a first back-off parameter value based on the back-off indication information, randomly selects a first back-off time from values uniformly distributed between 0 and the first back-off parameter value, and determines the first PRACH resource based on the first back-off time and the first offset value; or,

The terminal device determines a first backoff parameter value based on the backoff indication information, randomly selects a first backoff time from 0 and a value uniformly distributed between the sum of the first backoff parameter value and the first offset value, and determines the first PRACH resource based on the first backoff time.
The method of any of claims 1 to 17, wherein the first indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.
The method according to any of claims 1 to 18, wherein the back-off indication information and the offset value indication information may be carried in the same information;

alternatively, the back-off indication information and the offset value indication information may be carried in different information.
A method of antenna polarization mode determination, the method comprising:

and the terminal equipment acquires an antenna polarization mode based on third indication information, wherein the third indication information is used for determining the antenna polarization mode.
The method of claim 20, wherein the terminal device obtains the third indication information according to a predefined rule; or,

and the terminal equipment receives the third indication information sent by the network equipment.
The method of claim 21, wherein the terminal device receives the third indication information sent by a network device, where the third indication information is carried by at least one of a system message, a paging message, a wake-up signal, radio resource control RRC signaling, a medium access control unit MAC CE, and downlink control information DCI.
The method of any of claims 20 to 22, wherein the antenna polarization pattern comprises:

a downlink antenna polarization mode and/or an uplink antenna polarization mode.
The method of claim 23, wherein the downlink antenna polarization pattern and the uplink antenna polarization pattern have a first association.
The method of claim 24, wherein the first association comprises: the polarization mode of the downlink antenna is the same as that of the uplink antenna; and/or the number of the groups of groups,

the first association is carried by at least one of a system message, a paging message, a wake-up signal, an RRC signaling, a MAC CE, and DCI.
The method of any of claims 23 to 25, wherein the downlink antenna polarization pattern comprises at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The method of any of claims 23 to 26, wherein the uplink antenna polarization pattern comprises at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The method of any of claims 20 to 27, wherein the third indication information is used to indicate that the antenna polarization mode is right-hand or left-hand.
The method of any of claims 20 to 28, wherein the antenna polarization mode is linear polarization if the third indication information does not indicate the antenna polarization mode.
The method according to any of claims 20 to 29, wherein the antenna polarization pattern has a second association with a cell identification, ID.
The method of claim 30, wherein the second association is carried by at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, MAC CE, and downlink control information, DCI;

or the second association relation is obtained according to a predefined rule.
The method according to claim 30 or 31, wherein the second association is for radio resource management, RRM, measurements and/or radio link monitoring, RLM, measurements of the neighbor.
The method of any of claims 20 to 32, wherein the third indication information is used to determine an antenna polarization mode, comprising one of:

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

the third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A random access method, the method comprising:

the network equipment sends first indication information to the terminal equipment, wherein the first indication information comprises back-off indication information and/or offset value indication information, and the back-off indication information and/or the offset value indication information are used for the terminal equipment to initiate random access.
The method of claim 34, wherein the first indication information comprises one or more fallback indication information, each corresponding to one first fallback parameter.
The method of claim 35, wherein the at least one back-off indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 36, wherein the first correspondence comprises one of:

one back-off indication information corresponds to one coverage enhancement level and/or a set of random access parameters;

one back-off indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two back-off indication information correspond to a coverage enhancement level and/or a set of random access parameters.
The method of claim 36 or 37, wherein the first correspondence is carried in at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, control element, MAC CE, and DCI;

or, the first correspondence is obtained according to a predefined rule.
The method of any of claims 34 to 38, wherein the offset value indication information comprises at least one offset value, the at least one offset value being used to determine the first offset value.
The method of claim 39, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 40, wherein the second correspondence comprises one of:

an offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

one offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The method of claim 40 or 41, wherein the second correspondence is carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

or the second corresponding relation is obtained according to a predefined rule.
The method of any of claims 34 to 42, wherein the first indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.
The method of any of claims 34 to 43, wherein the back-off indication information and the offset value indication information may be carried in the same information;

Alternatively, the back-off indication information and the offset value indication information may be carried in different information.
A method of antenna polarization mode determination, the method comprising:

the network device sends third indication information to the terminal device, wherein the third indication information is used for determining an antenna polarization mode.
The method of claim 45, wherein the third indication information is carried by at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, control element, MAC CE, and downlink control information, DCI.
The method of claim 45 or 46, wherein the antenna polarization mode comprises:

a downlink antenna polarization mode and/or an uplink antenna polarization mode.
The method of claim 47, wherein the downlink antenna polarization pattern has a first association with the uplink antenna polarization pattern.
The method of claim 48, wherein the first association comprises: the polarization mode of the downlink antenna is the same as that of the uplink antenna; and/or the number of the groups of groups,

the first association relationship is carried in at least one of a system message, a paging message, a wake-up signal, a Radio Resource Control (RRC) signaling, a Media Access Control (MAC) CE and Downlink Control Information (DCI).
The method of any one of claims 47 to 49, wherein the downlink antenna polarization pattern comprises at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The method of any one of claims 49 to 50, wherein the uplink antenna polarization pattern comprises at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The method of any one of claims 45 to 50, wherein the third indication information is used to indicate that the antenna polarization mode is right-hand or left-hand.
The method of any one of claims 45 to 52, wherein if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.
The method of any one of claims 45 to 53, wherein the antenna polarization pattern has a second association with a cell identification, ID.
The method of claim 54, wherein the second association is carried in at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, MAC CE, and downlink control information, DCI;

Or the second association relation is obtained according to a predefined rule.
The method of claim 54 or 55, wherein the second association is for radio resource management, RRM, measurements and/or radio link monitoring, RLM, measurements of the neighbor.
The method of any one of claims 45 to 56, wherein the third indication information is used to determine an antenna polarization mode, comprising one of:

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

the third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A terminal device, the terminal device comprising:

the first processing unit is configured to acquire first indication information, wherein the first indication information comprises: back-off indication information and/or offset value indication information;

And the first sending unit is configured to initiate random access according to the back-off indication information and/or the offset value indication information.
The terminal device of claim 58, wherein the first processing unit is configured to determine a second backoff parameter according to the backoff indication information and/or the offset value indication information, wherein the offset value indication information is used to indicate a first offset value;

the first sending unit is configured to initiate random access according to the second back-off parameter.
The terminal device of claim 58 or 59, wherein the first indication information comprises one or more fallback indication information, each corresponding to one first fallback parameter.
The terminal device of claim 60, wherein the at least one back-off indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The terminal device of claim 61, wherein said first correspondence comprises one of:

one back-off indication information corresponds to one coverage enhancement level and/or a set of random access parameters;

One back-off indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two back-off indication information correspond to a coverage enhancement level and/or a set of random access parameters.
The terminal device of claim 61 or 62, wherein the first correspondence is obtained by at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, control element, MAC CE, and DCI;

or, the first correspondence is obtained according to a predefined rule.
The terminal device of any of claims 61 to 63, wherein,

the first processing unit is configured to determine a first coverage enhancement level and/or a first set of random access parameters; and determining the first coverage enhancement level and/or the first rollback parameter corresponding to the first set of random access parameters in the at least one rollback indication information based on the first correspondence.
The terminal device of any of claims 58 to 64, wherein the offset value indication information comprises at least one offset value, the at least one offset value being used to determine the first offset value.
The terminal device of claim 65, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The terminal device of claim 66, wherein said second correspondence includes one of:

an offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

one offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The terminal device of claim 66 or 67, wherein the second correspondence is obtained by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

or the second corresponding relation is obtained according to a predefined rule.
The terminal device of any of claims 65 to 68, wherein,

the first processing unit is configured to determine a first coverage enhancement level and/or a first set of random access parameters; and determining the first coverage enhancement level and/or the first offset value corresponding to the first set of random access parameters in the at least one offset value based on the second corresponding relation.
The terminal device of claim 64 or 69, wherein the first processing unit is configured to perform at least one of:

determining the first coverage enhancement level and/or the first set of random access parameters corresponding to the terminal equipment according to the capability of the terminal equipment;

determining the first coverage enhancement level and/or the first set of random access parameters according to a measurement result of reference signal received power, RSRP;

and determining the first coverage enhancement level and/or the first set of random access parameters according to second indication information sent by the network equipment.
The terminal device of claim 70, wherein the second indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, MAC CE, and DCI.
A terminal device according to claim 70 or 71, wherein the second indication information is determined from the capability of the terminal device to report.
The terminal device of any of claims 58 to 72, wherein,

the first sending unit is configured to determine a first physical random access channel PRACH resource based on the back-off indication information and/or the offset value indication information; and sending the PRACH on the first PRACH resource.
The terminal device of claim 73, wherein,

the first sending unit is configured to determine a first backoff parameter value based on the backoff indication information, randomly select a first backoff time from values uniformly distributed between 0 and the first backoff parameter value, and determine the first PRACH resource based on the first backoff time; or,

determining a first backoff parameter value based on the backoff indication information, randomly selecting a first backoff time from among values uniformly distributed between 0 and the first backoff parameter value, and determining the first PRACH resource based on the first backoff time and the first offset value; or,

a first backoff parameter value is determined based on the backoff indication information, a first backoff time is randomly selected from 0 and a value uniformly distributed between the first backoff parameter value and a sum of the first offset values, and the first PRACH resource is determined based on the first backoff time.
The terminal device of any of claims 58 to 74, wherein the first indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.
A terminal device according to any of claims 58 to 74, wherein the back-off indication information and the offset value indication information may be carried in the same information;

Alternatively, the back-off indication information and the offset value indication information may be carried in different information.
A terminal device, the terminal device comprising:

and a second processing unit configured to acquire an antenna polarization mode based on third instruction information, wherein the third instruction information is used for determining the antenna polarization mode.
The terminal device of claim 77, wherein,

the second processing unit is configured to acquire the third indication information according to a predefined rule; or receiving the third indication information sent by the network equipment.
The terminal device of claim 78, wherein said third indication information is carried by at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, control element, MAC CE, and downlink control information, DCI.
The terminal device of any of claims 77-79, wherein the antenna polarization mode comprises:

a downlink antenna polarization mode and/or an uplink antenna polarization mode.
The terminal device of claim 80, wherein said downlink antenna polarization pattern has a first association with said uplink antenna polarization pattern.
The terminal device of claim 81, wherein the first association comprises: the polarization mode of the downlink antenna is the same as that of the uplink antenna; and/or the number of the groups of groups,

the first association is carried by at least one of a system message, a paging message, a wake-up signal, an RRC signaling, a MAC CE, and DCI.
The terminal device of any of claims 80-82, wherein the downlink antenna polarization pattern includes at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The terminal device of any of claims 80-83, wherein the uplink antenna polarization mode includes at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The terminal device of any of claims 77 to 84, wherein the third indication information is used to indicate that the antenna polarization mode is right-hand polarized or left-hand polarized.
The terminal device of any of claims 77 to 85, wherein if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.
The terminal device of any of claims 77 to 86, wherein the antenna polarization pattern has a second association with a cell identification, ID.
The terminal device of claim 87, wherein said second association is carried by at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, control element, MAC CE, and downlink control information, DCI;

or the second association relation is obtained according to a predefined rule.
The terminal device of claim 87 or 88, wherein the second association is for radio resource management, RRM, measurements and/or radio link monitoring, RLM, measurements of the neighbor.
The terminal device of any of claims 77 to 89, wherein the third indication information is used to determine an antenna polarization mode, comprising one of:

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

The third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A network device, the network device comprising:

the second sending unit is configured to send first indication information to the terminal equipment, wherein the first indication information comprises back-off indication information and/or offset value indication information, and the back-off indication information and/or the offset value indication information are used for the terminal equipment to initiate random access.
The network device of claim 91, wherein the first indication information comprises one or more fallback indication information, each of the fallback indication information corresponding to one first fallback parameter.
The network device of claim 92, wherein the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The network device of claim 93, wherein the first correspondence comprises one of:

one back-off indication information corresponds to one coverage enhancement level and/or a set of random access parameters;

one back-off indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two back-off indication information correspond to a coverage enhancement level and/or a set of random access parameters.
The network device of claim 93 or 94, wherein the first correspondence is carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

or, the first correspondence is obtained according to a predefined rule.
The network device of any of claims 91 to 95, wherein the offset value indication information comprises at least one offset value, the at least one offset value being used to determine the first offset value.
The network device of claim 96, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The network device of claim 97, wherein the second correspondence comprises one of:

an offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

one offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

at least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The network device of claim 97 or 98, wherein the second correspondence is carried in at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI;

or the second corresponding relation is obtained according to a predefined rule.
The network device of any one of claims 91 to 99, wherein the first indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, a MAC CE, and DCI.
The network device of any of claims 91 to 100, wherein the back-off indication information and the offset value indication information may be carried in the same information;

alternatively, the back-off indication information and the offset value indication information may be carried in different information.
A network device, the network device comprising:

and a third transmitting unit configured to transmit third indication information to the terminal device, where the third indication information is used to determine an antenna polarization mode.
The network device of claim 102, wherein the third indication information is carried by at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, control element, MAC CE, and downlink control information, DCI.
The network device of claim 102 or 103, wherein the antenna polarization mode comprises:

a downlink antenna polarization mode and/or an uplink antenna polarization mode.
The network device of claim 101, wherein the downlink antenna polarization mode has a first association with the uplink antenna polarization mode.
The network device of claim 102, wherein the first association comprises: the polarization mode of the downlink antenna is the same as that of the uplink antenna; and/or the number of the groups of groups,

the first association relationship is carried in at least one of a system message, a paging message, a wake-up signal, an RRC signaling, a MAC CE and DCI.
The network device of any one of claims 104 to 106, wherein the downlink antenna polarization pattern comprises at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The network device of any one of claims 104 to 107, wherein the uplink antenna polarization pattern comprises at least one of:

right-hand polarization, left-hand polarization, and linear polarization.
The network device of any one of claims 103 to 108, wherein the third indication information is used to indicate that the antenna polarization mode is right-hand polarized or left-hand polarized.
The network device of any one of claims 103 to 109, wherein if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.
The network device of any of claims 102 to 110, wherein the antenna polarization pattern has a second association with a cell identification, ID.
The network device of claim 111, wherein the second association is carried in at least one of a system message, a paging message, a wake-up signal, radio resource control, RRC, signaling, a medium access control, MAC CE, and downlink control information, DCI;

or the second association relation is obtained according to a predefined rule.
The network device of claim 111 or 112, wherein the second association is for radio resource management, RRM, measurements and/or radio link monitoring, RLM, measurements of the neighbor.
The network device of any one of claims 102 to 113, wherein the third indication information is used to determine an antenna polarization mode, comprising one of:

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

the third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

the third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A terminal device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

the processor being arranged to execute the steps of the random access method of any of claims 1 to 19 when the computer program is run.
A terminal device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

the processor being adapted to perform the steps of the antenna polarization mode determination method of any one of claims 20 to 33 when the computer program is run.
A network device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

The processor is configured to perform the steps of the random access method of any of claims 34 to 44 when the computer program is run.
A network device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein,

the processor being operative to perform the steps of the method for determining an antenna polarization mode of any one of claims 45 to 57 when executing the computer program.
A storage medium storing an executable program which, when executed by a processor, implements the random access method of any one of claims 1 to 19; alternatively, the random access method of any of claims 34 to 44 is implemented.
A storage medium storing an executable program which, when executed by a processor, implements the antenna polarization mode determination method of any one of claims 20 to 33; alternatively, the antenna polarization mode determination method of any one of claims 45 to 57 is implemented.
A computer program product comprising computer program instructions for causing a computer to perform the random access method according to any one of claims 1 to 19; alternatively, a random access method according to any of claims 34 to 44 is performed.
A computer program product comprising computer program instructions for causing a computer to perform the random access method of any one of claims 20 to 33; alternatively, a random access method according to any of claims 45 to 57 is performed.
A computer program for causing a computer to perform the random access method according to any one of claims 1 to 19; alternatively, a random access method according to any of claims 34 to 44 is performed.
A computer program for causing a computer to perform the random access method of any one of claims 20 to 33; alternatively, a random access method according to any of claims 45 to 57 is performed.
A chip, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the random access method of any one of claims 1 to 19; alternatively, a random access method according to any of claims 34 to 44 is performed.
A chip, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the random access method of any one of claims 20 to 33; alternatively, a random access method according to any of claims 45 to 57 is performed.