Random access method, communication device, communication system, and storage medium and program product

Abstract

The present disclosure relates to the technical field of communications, and specifically relates to a random access method, a communication device, a communication system, a storage medium and a program product. The random access method comprises: determining, from a plurality of reference positions, a first reference position associated with the position of a terminal; determining, on the basis of the configuration of a first physical random access channel (PRACH) resource associated with the first reference position, the first PRACH resource used by the terminal; and sending on the first PRACH resource a first random access request message to a network device. The present disclosure is conducive to reducing the latency of a random access procedure.

Description

Random access methods, communication equipment, communication systems, storage media and software products Technical Field

[0001] This disclosure relates to the field of communication technology, and more specifically, to random access methods, communication devices, communication systems, storage media, and program products. Background Technology

[0002] One research direction in the evolution of non-terrestrial networks (NTNs) is to use beam hopping technology to address the supply-demand imbalance in satellite coverage areas. Beam hopping technology can utilize all available satellite resources to provide services to specific locations or users. By adjusting the beam's illumination duration and period, beam hopping technology provides different capacity values ​​to balance the requirements of different beam coverage areas. Summary of the Invention

[0003] Embodiments of this disclosure provide random access methods, communication devices, communication systems, storage media, and program products to address technical problems in the related art, such as how to reduce the latency of the random access process.

[0004] According to a first aspect of the present disclosure, a random access method is proposed, executed by a terminal, the method comprising: determining a first reference location associated with the location of the terminal among a plurality of reference locations; determining a first PRACH resource to be used by the terminal according to a first physical random access channel (PRACH) resource configuration associated with the first reference location; and sending a first random access request message to a network device on the first PRACH resource.

[0005] According to a second aspect of the present disclosure, a random access method is provided, executed by a network device, the method comprising: receiving a first random access request message sent by a terminal on a first PRACH resource; wherein the first PRACH resource is determined by the terminal according to a first PRACH resource configuration associated with a first reference location, the first reference location being associated with the location of the terminal.

[0006] According to a third aspect of the present disclosure, a communication device is provided, the communication device being used to perform the random access method of the first aspect described above, or the random access method of the second aspect described above.

[0007] According to a fourth aspect of the present disclosure, a communication system is provided, including a terminal and a network device, wherein the terminal is configured to implement the random access method of the first aspect described above, and the network device is configured to implement the random access method of the second aspect described above.

[0008] According to a fifth aspect of the present disclosure, a storage medium is provided that stores instructions that, when executed on a communication device, cause the communication device to perform the random access method of the first aspect or the random access method of the second aspect described above.

[0009] According to a sixth aspect of the present disclosure, a program product is provided, comprising at least one of a program and instructions, wherein when the program or instructions are executed by a communication device, they implement the steps of the random access method of the first aspect described above, or the steps of the random access method of the second aspect described above.

[0010] According to embodiments of this disclosure, it is beneficial to reduce the latency of the entire random access process. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of this disclosure. Figure 2 is a schematic diagram of uplink and downlink beam assumptions for a terminal in the initial access phase of a terrestrial network according to an embodiment of this disclosure. Figure 3 is a schematic diagram of beam frequency hopping according to an embodiment of this disclosure. Figure 4 is a schematic diagram of beam illumination periods according to an embodiment of this disclosure. Figure 5 is an interactive schematic diagram of a random access method according to an embodiment of this disclosure. Figure 6 is an interactive schematic diagram of a random access method according to an embodiment of this disclosure. Figure 7 is a schematic diagram of SSB and PRACH resource mapping according to an embodiment of this disclosure. Figure 8 is a schematic diagram of determining an associated reference location based on the geographical location of a terminal according to an embodiment of this disclosure. Figure 9A is a structural schematic diagram of a terminal according to an embodiment of this disclosure. Figure 9B is a structural schematic diagram of a network device according to an embodiment of this disclosure. Figure 10A is a schematic diagram of the structure of the communication device proposed in an embodiment of this disclosure. Figure 10B is a schematic diagram of the structure of the chip proposed in an embodiment of this disclosure. Detailed Implementation

[0012] Embodiments of this disclosure provide a random access method, communication device, communication system, storage medium, and program product.

[0013] In a first aspect, embodiments of this disclosure propose a random access method executed by a terminal, the method comprising: determining a first reference location associated with the location of the terminal among a plurality of reference locations; determining a first PRACH resource to be used by the terminal according to a first physical random access channel (PRACH) resource configuration associated with the first reference location; and sending a first random access request message to a network device on the first PRACH resource.

[0014] In the above embodiments, for NTN systems employing beam-hopping technology, the terminal determines which narrow beam to switch to corresponds to the first reference position and informs the network device of this decision. Accordingly, since the terminal does not need to perform reference signal measurements and report measurement data, it can achieve a beam-switching mechanism from wide beam to narrow beam. This helps reduce the latency of the entire beam-switching process between the terminal and the network device, allowing common messages to be carried by the wide beam and decided signals / channels to be carried by the narrow beam, thus improving the communication performance of the NTN system.

[0015] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: receiving broadcast information sent by the network device, the broadcast information including the plurality of reference locations.

[0016] In the above embodiments, the terminal can learn about multiple switchable narrow beams by using the multiple reference locations included in the broadcast information.

[0017] In conjunction with some embodiments of the first aspect, in some embodiments, the broadcast information includes system message block SIB1 information or SIB19 information.

[0018] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: receiving a first random access request response message sent by the network device.

[0019] In the above embodiments, through the first random access request response message, the terminal can determine that the network device has learned that it has switched to the narrow beam corresponding to the first reference position and has completed the random access between the terminal and the network device.

[0020] In conjunction with some embodiments of the first aspect, in some embodiments, the PRACH resource configuration associated with each reference location includes at least one of the following: available random access opportunity (RO) resources; candidate sequences.

[0021] In conjunction with some embodiments of the first aspect, in some embodiments, determining the first PRACH resource used by the terminal based on the first PRACH resource configuration associated with the first reference location includes at least one of the following: selecting an RO resource from the RO resources associated with the first reference location as the first PRACH resource used by the terminal based on the first PRACH resource configuration associated with the first reference location; and selecting a candidate sequence from the candidate sequences associated with the first reference location as the first PRACH resource used by the terminal based on the first PRACH resource configuration associated with the first reference location.

[0022] In conjunction with some embodiments of the first aspect, in some embodiments, determining a first reference location associated with the location of the terminal among a plurality of reference locations includes: calculating the distance between the location of the terminal and each reference location; and selecting the closest reference location as the first reference location associated with the location of the terminal.

[0023] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: satisfying beam switching conditions; determining a second reference location among the plurality of reference locations associated with the location of the terminal, wherein the second reference location is different from the first reference location; determining a second PRACH resource used by the terminal based on a second PRACH resource configuration associated with the second reference location; and sending a second random access request message to the network device on the second PRACH resource.

[0024] In the above embodiments, as the terminal and / or satellite move continuously, when the terminal determines that the beam switching conditions are met, it can determine the associated second reference position based on its own location, and determine the second PRACH resource to be used by the terminal based on the second PRACH resource configuration associated with the second reference position. It then initiates a random access procedure on the second PRACH resource, allowing the terminal to independently decide which narrow beam to switch to corresponds to the second reference position, and informs the network device of this decision. Therefore, since the terminal does not need to perform reference signal measurement and report measurement data, the beam switching / beam failure recovery mechanism can be implemented, which helps reduce the latency of the entire beam switching / beam failure recovery process.

[0025] In conjunction with some embodiments of the first aspect, in some embodiments, satisfying the beam switching condition includes at least one of the following: the distance between the location of the terminal and the first reference location is greater than or equal to a first threshold; the distance between the location of the terminal and the second reference location is less than or equal to a second threshold; the distance between the location of the terminal and the first reference location is greater than or equal to the first threshold, and the duration of the distance between the location of the terminal and the first reference location being greater than or equal to the first threshold is greater than or equal to a third threshold; the distance between the location of the terminal and the second reference location is less than or equal to the second threshold, and the duration of the distance between the location of the terminal and the second reference location being less than or equal to the second threshold is greater than or equal to a fourth threshold.

[0026] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: receiving a second random access request response message sent by the network device.

[0027] In the above embodiments, through the second random access request response message, the terminal can determine that the network device has learned that it has switched to the narrow beam corresponding to the second reference position and has completed the random access between the terminal and the network device.

[0028] In conjunction with some embodiments of the first aspect, in some embodiments, receiving the second random access request response message sent by the network device includes: detecting the corresponding PDCCH according to the recovery search space within the configured beam failure recovery control resource set (BFR-CORESET) to receive the second random access request response message sent by the network device, wherein the BFR-CORESET resource is used to transmit the beam failure recovery request response message, and the PDCCH is used to transmit the beam failure recovery request response message.

[0029] In conjunction with some embodiments of the first aspect, in some embodiments, the plurality of reference locations are indicated based on a local coordinate system or a global coordinate system.

[0030] Secondly, embodiments of this disclosure propose a random access method executed by a network device, the method comprising: receiving a first random access request message sent by a terminal on a first PRACH resource; wherein the first PRACH resource is determined by the terminal according to a first PRACH resource configuration associated with a first reference location, the first reference location being associated with the location of the terminal.

[0031] In the above embodiments, for an NTN system employing beam-hopping technology, the network device can receive a first random access request message sent by the terminal on a first PRACH resource. The first PRACH resource is determined by the terminal based on the configuration of the first PRACH resource associated with a first reference location, which is associated with the location of the terminal. Accordingly, the terminal decides on its own which narrow beam to switch to is the narrow beam corresponding to the first reference location and informs the network device of this decision. Since the terminal does not need to perform reference signal measurement and report measurement reports, it can realize the beam switching mechanism from wide beam to narrow beam. This helps reduce the latency of the entire beam switching process between the terminal and the network device, thereby enabling common messages to be carried by the wide beam and determined signals / channels to be carried by the narrow beam, which is beneficial to improving the communication performance of the NTN system.

[0032] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: transmitting broadcast information, the broadcast information including a plurality of reference locations.

[0033] In conjunction with some embodiments of the second aspect, in some embodiments, the broadcast information includes SIB1 information or SIB19 information.

[0034] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: sending a first random access request response message to the terminal.

[0035] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: sending a first PRACH resource configuration associated with the first reference location to the terminal.

[0036] In conjunction with some embodiments of the second aspect, in some embodiments, the PRACH resource configuration associated with each reference location includes at least one of the following: available RO resources; candidate sequences.

[0037] In conjunction with some embodiments of the second aspect, in some embodiments, the first PRACH resource includes at least one of the following: any RO resource associated with the first reference location; any candidate sequence associated with the first reference location.

[0038] In conjunction with some embodiments of the second aspect, in some embodiments, among the plurality of reference locations, the first reference location is closest to the location where the terminal is located.

[0039] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: receiving a second random access request message sent by the terminal on a second PRACH resource; wherein the second PRACH resource is determined by the terminal according to a second PRACH resource configuration associated with a second reference location, the second reference location being associated with the location of the terminal, and the second reference location being different from the first reference location.

[0040] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: sending a second random access request response message to the terminal.

[0041] In conjunction with some embodiments of the second aspect, in some embodiments, the plurality of reference locations are indicated based on a local coordinate system or a global coordinate system.

[0042] Thirdly, embodiments of this disclosure provide a random access device, the device comprising: a processing module, configured to determine a first reference location associated with the location of the device among a plurality of reference locations; the processing module, configured to determine a first PRACH resource used by the device according to a first PRACH resource configuration associated with the first reference location; and a transceiver module, configured to send a first random access request message to a network device on the first PRACH resource.

[0043] Fourthly, embodiments of this disclosure provide a random access device, the device comprising: a transceiver module, configured to receive a first random access request message sent by a terminal on a first PRACH resource; wherein the first PRACH resource is determined by the terminal according to a first PRACH resource configuration associated with a first reference location, the first reference location being associated with the location of the terminal.

[0044] Fifthly, embodiments of this disclosure provide a terminal, comprising: one or more processors; wherein the processors are configured to invoke instructions to cause the terminal to execute the random access method described in the first aspect and optional embodiments of the first aspect.

[0045] In a sixth aspect, embodiments of this disclosure provide a network device comprising: one or more processors; wherein the processors are configured to invoke instructions to cause the network device to perform the random access method described in the second aspect and optional embodiments of the second aspect.

[0046] In a seventh aspect, embodiments of this disclosure provide a communication device including at least one of a program and instructions, wherein when the at least one of the program and instructions is executed by the communication device, it implements the steps of the random access method of the first aspect described above, or the steps of the random access method of the second aspect described above.

[0047] Eighthly, embodiments of this disclosure provide a communication system comprising: a terminal and a network device; wherein the terminal is configured to perform the method described in the first aspect and optional embodiments thereof, and the network device is configured to perform the method described in the second aspect and optional embodiments thereof.

[0048] In a ninth aspect, embodiments of this disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the methods described in the first aspect and optional embodiments of the first aspect, and / or the methods described in the second aspect and optional embodiments of the second aspect.

[0049] In a tenth aspect, embodiments of this disclosure provide a program product, including at least one of a program and instructions, wherein when the program or instructions are executed by a communication device, they implement the random access method as described in the first aspect and optional embodiments thereof, or the random access method as described in the second aspect and optional embodiments thereof.

[0050] In an eleventh aspect, embodiments of this disclosure provide a computer program that, when run on a computer, causes the computer to perform the methods described in the first aspect, optional embodiments of the first aspect, or the second aspect, optional embodiments of the second aspect.

[0051] It is understood that the aforementioned communication equipment, communication system, storage medium, program product, and computer program are all used to execute the methods proposed in the embodiments of this disclosure. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0052] This disclosure provides embodiments of a random access method, communication equipment, communication system, storage medium, and program product. In some embodiments, the terms random access method, beam switching method, information processing method, and communication method may be used interchangeably.

[0053] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments. In all embodiments of this disclosure, unless otherwise specified or logically conflicting, the terminology and / or descriptions between the embodiments are consistent and can be mutually referenced. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0054] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0055] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0056] In the embodiments disclosed herein, "multiple" refers to two or more.

[0057] In some embodiments, the terms “at least one of A or B, at least one of A and B”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0058] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of whether there is a branch B); in some embodiments, B (execute B regardless of whether there is a branch A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0059] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execute A regardless of whether a branch B exists); in some embodiments, B (execute B regardless of whether a branch A exists); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, and C.

[0060] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0061] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0062] In some embodiments, terms such as "time / frequency" and "time-frequency domain" refer to the time domain and / or frequency domain.

[0063] In some embodiments, terms such as “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “when…”, “if…”, etc. can be used interchangeably. These descriptions all refer to the device making a corresponding action under certain objective circumstances. They do not necessarily limit the time, nor do they require the device to make a judgment action when implementing it, nor do they mean that there must be other limitations.

[0064] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0065] In some embodiments, devices, etc., may be interpreted as physical or virtual, and their names are not limited to those described in the embodiments. Terms such as “device,” “equipment,” “circuit,” “network element,” “network function,” “network device,” “function,” “node,” “unit,” “section,” “system,” “network,” “chip,” “chip system,” “entity,” and “subject” are interchangeable.

[0066] In some embodiments, "network" can be interpreted as devices included in a network (e.g., access network devices, core network devices, etc.).

[0067] In some embodiments, the terms "access network device (AN device)," "radio access network device (RAN device)," "base station (BS)," "radio base station," "fixed station," "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," and "bandwidth part (BWP)" can be used interchangeably.

[0068] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", "subscriber station", "mobile unit", "subscriber unit", "wireless unit", "remote unit", "mobile device", "wireless device", "wireless communication device", "remote device", "mobile subscriber station", "access terminal", "mobile terminal", "wireless terminal", "remote terminal", "handset", "user agent", "mobile client", and "client" can be used interchangeably.

[0069] In some embodiments, access network devices, core network devices, or network devices can be replaced by terminals. For example, embodiments of this disclosure can also be applied to structures where communication between access network devices, core network devices, or network devices and terminals is replaced by communication between multiple terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the structure can also be configured such that the terminal has all or part of the functions of the access network device. Furthermore, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can be replaced with sidelink channel, and uplink link, downlink, etc., can be replaced with sidelink link.

[0070] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, core network device, or network device may also be configured to have all or some of the functions of the terminal.

[0071] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0072] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0073] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0074] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

[0075] As shown in Figure 1, the communication system 100 includes a terminal 101 and a network device 102, wherein the network device includes at least one of the following: an access network device and a core network device.

[0076] In some embodiments, terminal 101 includes, but is not limited to, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home.

[0077] In some embodiments, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include, but is not limited to, at least one of the following in a 5G communication system: evolved Node B (eNB), next-generation eNB (ng-eNB), next-generation Node B (gNB), node B (NB), home node B (HNB), home evolved node B (HeNB), radio backhaul device, radio network controller (RNC), base station controller (BSC), base transceiver station (BTS), base band unit (BBU), mobile switching center, base station in a 6G communication system, open RAN, cloud RAN, base station in other communication systems, and access node in a Wi-Fi system.

[0078] In some embodiments, a core network device may be a single device comprising one or more network elements, or it may be multiple devices or a group of devices, each comprising all or part of the aforementioned one or more network elements. Network elements may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), or a Next Generation Core (NGC).

[0079] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0080] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the access network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0081] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0082] The following embodiments of this disclosure can be applied to the communication system 100 shown in FIG1, or to some of the main bodies, but are not limited thereto. The main bodies shown in FIG1 are illustrative. The communication system may include all or some of the main bodies in FIG1, or may include other main bodies outside of FIG1. ​​The number and form of each main body are arbitrary. Each main body may be physical or virtual. The connection relationship between the main bodies is illustrative. The main bodies may not be connected or may be connected. The connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0083] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0084] In some embodiments, within a terrestrial network (TN), SSBs with different synchronization signal / physical broadcast channel block (SPB) indices can be transmitted using different beams. Correspondingly, uplink physical random access channel (PRACH) resources and uplink preambles can be transmitted using the uplink beam corresponding to the downlink beam.

[0085] Figure 2 is a schematic diagram illustrating the uplink and downlink beam assumptions of a terminal in the initial access phase of a terrestrial network according to an embodiment of the present disclosure. As shown in Figure 2, the base station transmits an SSB to the terminal using the downlink beam corresponding to SSB#1; the terminal receives the SSB transmitted by the base station in the direction of the downlink beam; further, the terminal transmits a PRACH to the base station using an uplink beam consistent with the direction of the downlink beam; the base station receives the PRACH in the direction of the uplink beam. Here, SSB#1 is mapped to PRACH / preamble resource #1. In some embodiments, the mapping from SSB to PRACH resource is performed in the time domain through a PRACH association period, that is, the terminal selecting the corresponding SSB index will select the corresponding PRACH resource to transmit the preamble. In some embodiments, the PRACH association period can be an integer multiple of the PRACH configuration period.

[0086] In some embodiments, non-terrestrial networks (NTNs) use very small aperture terminal (VSAT) antennas.

[0087] In some embodiments, the VSAT antenna can be replaced with a phased array antenna, thereby enabling data transmission in the NTN network using beamforming. The benefits of using beamforming include, but are not limited to: (1) providing more flexible beam scheduling based on different service requirements; (2) enhancing coverage and obtaining beamforming gain; and (3) reducing interference and improving spectrum efficiency.

[0088] In some embodiments, for NTN systems employing beam hopping technology, the activity time of beams varies in different areas during a satellite's scan of a set of predefined beam hopping patterns, thereby meeting service requirements. Terminals must complete the access process within the current beam's dwell time; otherwise, it will lead to increased random access latency and wasted uplink and downlink resources.

[0089] For example, Figure 3 is a schematic diagram of beam hopping according to an embodiment of the present disclosure. As shown in Figure 3, different circles represent coverage areas (beam positions) corresponding to different beams. Circles filled with grid lines indicate that the beam corresponding to that coverage area is currently illuminated. Terminals located within that coverage area can perform random access, data transmission, and other processes with the satellite. Figure 4 is a schematic diagram of beam illumination periods according to an embodiment of the present disclosure. As shown in Figure 4, during the beam illumination period, the terminal needs to first perform downlink synchronization (DL synchronization) and obtain system information acquisition, and then initiate a random access process at the configured PRACH occasion.

[0090] In some embodiments, terms such as “moment,” “point in time,” “time,” and “time location” can be used interchangeably, as can terms such as “duration,” “segment,” “time window,” “window,” and “time.”

[0091] In some embodiments, for NTN systems employing beam-hopping technology, wide beams can be used to transmit common messages, such as SSBs, system information blocks (SIBs) 1, and SIB19, to meet initial access requirements; and narrow beams can be used for dedicated uplink / downlink signal / channel transmission to support larger data volume transmission needs. In the above embodiments, a beam-switching mechanism is required to switch from the initial wide beam to the subsequent narrow beam for decimalized DL / UL signal / channel transmission.

[0092] In some embodiments, a switching mechanism from wide beam to narrow beam can be implemented based on reference signal measurements. For example, different channel state information reference signals (CSI-RS) are sent to the terminal via different beams. The terminal can measure different CSI-RS and report the measurement results to the base station to assist the base station in deciding which beam to switch to subsequently based on the measurement results. For example, the base station selects the beam corresponding to the CSI-RS with the highest signal strength as the narrow beam for subsequent transmission of the decimalized DL / UL signal / channel, based on the signal strength of the different CSI-RS.

[0093] In the above embodiments, for NTN systems that employ beam hopping technology, since the satellite needs to cover all locations on the ground, the lighting period in each beam footprint is not very long. The process of the terminal performing CSI-RS measurements and reporting measurement reports needs to be completed within the current beam lighting period. Therefore, the time delay of the entire beam switching process from wide beam to narrow beam between the terminal and the base station may be relatively large.

[0094] Figure 5 is an interactive schematic diagram of a random access method according to an embodiment of the present disclosure.

[0095] As shown in Figure 5, the random access methods include:

[0096] Step S501: The network device sends a broadcast message.

[0097] In some embodiments, the broadcast information includes system message block SIB1 information or SIB19 information.

[0098] In some embodiments, broadcast information is carried by a wide beam.

[0099] In some embodiments, the terms "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0100] In some embodiments, the broadcast information includes multiple reference locations. Each reference location corresponds one-to-one with a narrow beam. In some embodiments, the reference location is the center location of the coverage area of ​​its corresponding narrow beam. In the above embodiments, by using the multiple reference locations included in the broadcast information, the network device can indicate to the terminal multiple narrow beams to which it can consider switching.

[0101] In some embodiments, the multiple reference locations are indicated based on a local coordinate system (LCS). Alternatively, the multiple reference locations are indicated based on a global coordinate system (GCS).

[0102] In some embodiments, the terminal receives broadcast information sent by a network device. In a further embodiment, the terminal obtains multiple reference locations included in the broadcast information.

[0103] In some embodiments, the network device sends a PRACH resource configuration associated with at least one reference location to the terminal. Each reference location is associated with a PRACH resource configuration.

[0104] In some embodiments, the PRACH resource configuration associated with each reference location includes at least one of the following: available random access occasion (RO) resources; and candidate sequences. For example, the first PRACH resource configuration associated with a first reference location includes at least one of the following: available RO resources associated with the first reference location; and candidate sequences associated with the first reference location. For example, the second PRACH resource configuration associated with a second reference location includes at least one of the following: available RO resources associated with the second reference location; and candidate sequences associated with the second reference location. Different RO resources are associated with different reference locations. Different terminals can initiate random access using different candidate sequences on the same RO resource.

[0105] In some embodiments, the configuration of the PRACH resource associated with each reference location can be configured in at least one of the following ways: explicit configuration; implicit configuration.

[0106] For details regarding the specific configuration of PRACH resources in the above embodiments, please refer to the relevant embodiments in Figure 6, which will not be described in detail here.

[0107] In step S502, the terminal determines the first reference position and the first PRACH resource.

[0108] In some embodiments, the terminal determines a first reference location associated with its location among a plurality of reference locations.

[0109] In some embodiments, the first reference position is the reference position that is closest to the terminal's location among a plurality of reference positions. In some embodiments, the terminal calculates the distance between its location and each reference position; the terminal selects the closest reference position as the first reference position associated with its location.

[0110] In some embodiments, the terminal determines the first PRACH resource to be used based on the first PRACH resource configuration associated with the first reference location.

[0111] In some embodiments, the terminal selects one RO resource from the RO resources associated with the first reference location as the first PRACH resource used by the terminal, based on the first PRACH resource configuration associated with the first reference location. In some embodiments, the terminal selects one candidate sequence from the candidate sequences associated with the first reference location as the first PRACH resource used by the terminal, based on the first PRACH resource configuration associated with the first reference location. In some embodiments, the terminal selects one RO resource from the RO resources associated with the first reference location and one candidate sequence from the candidate sequences associated with the first reference location, using both the selected RO resource and the selected candidate sequence as the first PRACH resource used by the terminal.

[0112] In step S503, the terminal sends a first random access request message to the network device on the first PRACH resource.

[0113] In some embodiments, the first random access request message is Msg.1.

[0114] In some embodiments, the first random access request message is carried by a narrow beam. In some embodiments, the first random access request message is carried by a narrow beam corresponding to a first reference location. In the above embodiments, by sending the first random access request message on the first PRACH resource, the terminal can instruct the network device to decide to switch from a wide beam to the narrow beam corresponding to the first reference location.

[0115] In some embodiments, the network device receives a first random access request message sent by the terminal. In the above embodiments, by receiving the first random access request message sent by the terminal on the first PRACH resource, the network device can know that the terminal has decided to switch from a wide beam to a narrow beam corresponding to the first reference position.

[0116] In step S504, the network device sends a first random access request response message to the terminal.

[0117] In some embodiments, the first random access request message is Msg.2.

[0118] In some embodiments, the first random access request response message is carried by a narrow beam. The uplink narrow beam carrying the first random access request message has the same direction as the downlink narrow beam carrying the first random access request response message. In the above embodiments, through the first random access request response message, the network device can indicate to the terminal that it has learned that the terminal has decided to switch from a wide beam to the narrow beam corresponding to the first reference position, and that random access between the terminal and the network device has been completed.

[0119] In some embodiments, the terminal receives a first random access request response message sent by the network device. In the above embodiments, through the first random access request response message, the terminal can determine that the network device has learned of the switch from a wide beam to a narrow beam corresponding to the first reference position, and that random access between the terminal and the network device has been completed. In a further embodiment, the terminal and the network device can use the narrow beam corresponding to the first reference position for uplink and downlink data transmission.

[0120] In the above embodiments, for an NTN system employing beam hopping technology, the terminal can determine its associated first reference position based on its own location, and determine the first PRACH resource to be used based on the configuration of the first PRACH resource associated with the first reference position. It then initiates a random access procedure on the first PRACH resource, allowing the terminal to independently decide which narrow beam to switch to corresponds to the first reference position, and informs the network device of this decision. Therefore, since the terminal does not need to perform reference signal measurement and report measurement data, it can achieve a beam switching mechanism from wide beam to narrow beam. This not only reduces the latency of the random procedure but also reduces the latency of the entire beam switching process between the terminal and the network device. Consequently, common messages are carried by the wide beam and decided signals / channels are carried by the narrow beam, improving the communication performance of the NTN system.

[0121] In some embodiments, as the terminal and / or satellite move continuously, the narrow beam corresponding to the first reference position used by the terminal may no longer be the optimal beam, or may even be a failed beam. Therefore, the terminal needs to select a new narrow beam, that is, a beam failure recovery / beam failure switching mechanism that does not require measurement based on the reference signal is needed.

[0122] In some embodiments, the terminal can reselect an associated reference position from multiple reference positions based on its changed position.

[0123] In step S505, if the beam switching conditions are met, the terminal determines the second reference position and the second PRACH resource.

[0124] In some embodiments, beam switching conditions can also be described as beam failure recovery conditions or beam failure recovery conditions.

[0125] In some embodiments, when beam switching conditions are met, the terminal determines a second reference position and a second PRACH resource, including at least one of the following: the distance between the terminal's location and the first reference position is greater than or equal to a first threshold value, and the terminal determines a second reference position and a second PRACH resource; the distance between the terminal's location and the second reference position is less than or equal to a second threshold value, and the terminal determines a second reference position and a second PRACH resource; the distance between the terminal's location and the first reference position is greater than or equal to a first threshold value, and the duration of the distance between the terminal's location and the first reference position being greater than or equal to a first threshold value is greater than or equal to a third threshold value, and the terminal determines a second reference position and a second PRACH resource; the distance between the terminal's location and the second reference position is less than or equal to a second threshold value, and the duration of the distance between the terminal's location and the second reference position being less than or equal to a second threshold value is greater than or equal to a fourth threshold value, and the terminal determines a second reference position and a second PRACH resource.

[0126] The first threshold value and the second threshold value may be equal or unequal. The third threshold value and the fourth threshold value may be equal or unequal. It should be noted that the specific values ​​of the first threshold value, the second threshold value, the third threshold value, and the fourth threshold value are not specifically limited in the embodiments of this disclosure.

[0127] Optionally, the terminal determines a second reference position when the beam switching conditions are met. Optionally, the terminal determines a second reference position in response to the beam switching conditions being met. Optionally, the terminal determines a second reference position when the beam switching conditions are met.

[0128] In some embodiments, a second reference location is determined from among a plurality of reference locations to be associated with the location of the terminal, wherein the second reference location is different from the first reference location. That is, after the location of the terminal changes, the terminal can determine a new associated reference location based on its new location.

[0129] In some embodiments, the second reference position is the reference position that is closest to the new position of the terminal among a plurality of reference positions. In some embodiments, the terminal calculates the distance between the new position of the terminal and each reference position respectively; the terminal selects the reference position with the closest distance as the second reference position associated with the new position of the terminal.

[0130] In some embodiments, the terminal determines the second PRACH resource to be used based on the second PRACH resource configuration associated with the second reference location.

[0131] In some embodiments, the terminal selects one RO resource from the RO resources associated with the second reference location as the second PRACH resource used by the terminal, based on the second PRACH resource configuration associated with the second reference location. In some embodiments, the terminal selects one candidate sequence from the candidate sequences associated with the second reference location as the second PRACH resource used by the terminal, based on the second PRACH resource configuration associated with the second reference location. In some embodiments, the terminal selects one RO resource from the RO resources associated with the second reference location and one candidate sequence from the candidate sequences associated with the second reference location, using both the selected RO resource and the selected candidate sequence as the second PRACH resource used by the terminal.

[0132] In step S506, the terminal sends a second random access request message to the network device on the second PRACH resource.

[0133] In some embodiments, the second random access request message is Msg.1.

[0134] In some embodiments, the second random access request message is carried by a narrow beam. In some embodiments, the second random access request message is carried by the narrow beam corresponding to the second reference position. In the above embodiments, by sending the second random access request message on the second PRACH resource, the terminal can instruct the network device to decide to switch to the narrow beam corresponding to the second reference position.

[0135] In some embodiments, the network device receives a second random access request message sent by the terminal. In the above embodiments, by receiving the second random access request message sent by the terminal on the second PRACH resource, the network device can know that the terminal has decided to switch to the narrow beam corresponding to the second reference position.

[0136] In step S507, the network device sends a second random access request response message to the terminal.

[0137] In some embodiments, the second random access request message is Msg.2.

[0138] In some embodiments, the second random access request response message is carried by a narrow beam. The uplink narrow beam carrying the second random access request message has the same direction as the downlink narrow beam carrying the second random access request response message. In the above embodiments, through the second random access request response message, the network device can indicate to the terminal that it has learned that the terminal has decided to switch to the narrow beam corresponding to the second reference position, and that random access between the terminal and the network device has been completed.

[0139] In some embodiments, within the configured beam failure recovery control resource set (BFR-CORESET) resource, the corresponding physical downlink control channel (PDCCH) is detected according to the recovery search space to receive a second random access request response message sent by the network device. The BFR-CORESET resource is used to transmit the beam failure recovery request response message, and the PDCCH is used to transmit the beam failure recovery request response message.

[0140] In some embodiments, the terminal receives a second random access request response message sent by the network device. In the above embodiments, through the second random access request response message, the terminal can determine that the network device has learned of the switch to the narrow beam corresponding to the second reference position and that random access between the terminal and the network device has been completed. In a further embodiment, the terminal and the network device can use the narrow beam corresponding to the second reference position for uplink and downlink data transmission.

[0141] In some embodiments, the configuration of BFR-CORESET resources and the configuration of the recovery search space are independent of the beam skipping mechanism, and the recovery search space ensures that there is a corresponding detection opportunity during the lighting period of all beams.

[0142] In some embodiments, the terms "search space", "search space set", "search space configuration", "search space set configuration", "control resource set (CORESET)", and "CORESET configuration" can be used interchangeably.

[0143] In the above embodiments, as the terminal and / or satellite move continuously, when the terminal determines that the beam switching conditions are met, it can determine the associated second reference position based on its own location, and determine the second PRACH resource to be used by the terminal based on the second PRACH resource configuration associated with the second reference position. It then initiates a random access procedure on the second PRACH resource, allowing the terminal to independently decide which narrow beam to switch to corresponds to the second reference position, and informs the network device of this decision. Therefore, since the terminal does not need to perform reference signal measurement and report measurement data, it can achieve the beam switching / beam failure recovery mechanism, which not only helps reduce the latency of the random procedure but also reduces the latency of the entire beam switching / beam failure recovery process.

[0144] It should be noted that although the embodiments disclosed herein are methods provided for addressing technical problems in NTN systems employing beam-hopping technology, they are not limited thereto. For example, the embodiments disclosed herein can also be used in other communication systems besides NTN systems, and can also be used in other communication systems that do not employ beam-hopping technology.

[0145] The communication method involved in the embodiments of this disclosure may include at least one of steps S501 to S507. For example, step S501 may be implemented as an independent embodiment, step S502 may be implemented as an independent embodiment, step S503 may be implemented as an independent embodiment, step S504 may be implemented as an independent embodiment, step S505 may be implemented as an independent embodiment, step S506 may be implemented as an independent embodiment, step S507 may be implemented as an independent embodiment, steps S502+S503 may be implemented as an independent embodiment, steps S503+S504 may be implemented as an independent embodiment, steps S505+S506 may be implemented as an independent embodiment, steps S506+S507 may be implemented as an independent embodiment, and steps S505+S506+S507 may be implemented as an independent embodiment, but are not limited thereto.

[0146] In some embodiments, steps S501, S502, S503, S504, S505, S506, and S507 may be performed in an interchangeable order or simultaneously.

[0147] In some embodiments, steps S501, S504, and S507 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0148] In some embodiments, the steps and their optional implementations in other optional embodiments described before or after the specification corresponding to FIG5, as well as other related parts in the specification, will not be repeated here.

[0149] Figure 6 is an interactive schematic diagram of a random access method according to an embodiment of the present disclosure. As shown in Figure 6, this disclosure relates to a random access method, which includes:

[0150] In step S601, the terminal determines a first reference position associated with its location among multiple reference positions.

[0151] In step S602, the terminal determines the first PRACH resource to be used based on the first PRACH resource configuration associated with the first reference location.

[0152] In step S603, the terminal sends a first random access request message to the network device on the first PRACH resource.

[0153] For example, the terminal's known reference locations include reference location #0, reference location #1, reference location #2, and reference location #3. The terminal has obtained the PRACH resource configurations associated with each of these reference locations as PRACH config #0, PRACH config #1, PRACH config #2, and PRACH config #3, respectively. The terminal can determine that the first reference location associated with its current location is reference location #1; furthermore, based on the PRACH resource configuration associated with the first reference location as PRACH config #1, the terminal can determine the first PRACH resource to use; furthermore, the terminal can initiate a random access procedure on the determined first PRACH resource, that is, the terminal can send Msg.1 to the network device on the first PRACH resource.

[0154] In some embodiments, the first random access request message is carried by a narrow beam. In some embodiments, the first random access request message is carried by the narrow beam corresponding to the first reference position. In the above embodiments, by sending the first random access request message on the first PRACH resource, the terminal can instruct the network device to decide to switch to the narrow beam corresponding to the first reference position.

[0155] It should be noted that the embodiment shown in Figure 6 can be implemented independently or in combination with at least one other embodiment in this disclosure. The specific choice can be made as needed, and this disclosure does not limit the scope.

[0156] Optionally, the network device may receive a first random access request message sent by the terminal.

[0157] According to embodiments of this disclosure, for an NTN system employing beam hopping technology, a terminal can determine its associated first reference position based on its location, and determine the first PRACH resource to use based on the configuration of the first PRACH resource associated with the first reference position. The terminal then initiates a random access procedure on the first PRACH resource, allowing it to independently decide which narrow beam to switch to corresponds to the first reference position, and informs the network device of this decision. Therefore, since the terminal does not need to perform reference signal measurement and report measurement data, it can achieve a beam switching mechanism from wide beam to narrow beam. This not only reduces the latency of the random procedure but also reduces the latency of the entire beam switching process between the terminal and the network device. Consequently, common messages are carried by the wide beam and decided signals / channels are carried by the narrow beam, improving the communication performance of the NTN system.

[0158] In some embodiments, the terminal receives broadcast information sent by a network device, the broadcast information including multiple reference locations. Optionally, the network device sends broadcast information, the broadcast information including multiple reference locations. In the above embodiments, the terminal can learn about multiple switchable narrow beams through the multiple reference locations included in the broadcast information.

[0159] In some embodiments, the broadcast information includes SIB1 information or SIB19 information.

[0160] In some embodiments, the multiple reference locations are indicated based on a local coordinate system or a global coordinate system.

[0161] In some embodiments, the terminal receives a first random access request response message sent by the network device. Optionally, the network device sends a first random access request response message to the terminal.

[0162] For example, after a terminal sends Msg.1 to a network device using the narrow beam corresponding to reference location #1 on the first PRACH resource, it can receive Msg.2 sent by the network device on the narrow beam corresponding to reference location #1.

[0163] In some embodiments, the first random access request response message is carried by a narrow beam. The uplink narrow beam carrying the first random access request message and the downlink narrow beam carrying the first random access request response message are oriented in the same direction. In the above embodiments, through the first random access request response message, the terminal can determine that the network device has been informed that it has switched to the narrow beam corresponding to the first reference position, and that random access between the terminal and the network device has been completed.

[0164] In a further embodiment, the terminal and network device can use a narrow beam corresponding to the first reference position for uplink and downlink data transmission.

[0165] In some embodiments, the PRACH resource configuration associated with each reference location includes at least one of the following: available random access opportunity (RO) resources; candidate sequences.

[0166] In some embodiments, the configuration of the PRACH resource associated with each reference location can be configured in at least one of the following ways: explicit configuration; implicit configuration.

[0167] For example, the PRACH resource configuration associated with each reference location is explicitly configured. A terminal can be configured with {reference location#0, PRACH config#0}, {reference location#1, PRACH config#1}, {reference location#2, PRACH config#2}, and {reference location#3, PRACH config#3}. Here, PRACH config#0 can include RO#0 associated with reference location#0, RO#1 associated with reference location#1, RO#2 associated with reference location#2, and RO#3 associated with reference location#3. PRACH config#0 can include at least one preamble associated with reference location#0, at least one preamble associated with reference location#1, at least one preamble associated with reference location#2, and at least one preamble associated with reference location#3. Specifically, PRACH config#1 can include RO#4 associated with reference location#1, RO#5 associated with reference location#1, RO#5 associated with reference location#2, and RO#7 associated with reference location#3. Other PRACH resource configurations can be deduced similarly and will not be elaborated upon here.

[0168] For example, the PRACH resource configuration associated with each reference location is implicitly configured. Figure 7 is a schematic diagram illustrating the mapping of SSB and PRACH resources according to an embodiment of this disclosure. The terminal can map SSB and PRACH resources as shown in Figure 7. As shown in Figure 7, under the wide beam corresponding to each SSB, available RO resources corresponding to multiple reference locations are configured respectively. The PRACH resources corresponding to each SSB can be divided into N equal parts (N is the number of reference locations). The N subsets obtained from the N equal parts are the available RO resources associated with each reference location, and the index of the PRACH resource subset can be equal to the index of the reference location. The PRACH resources corresponding to each SSB can be sorted first by the sequence index in ascending order, and then by the RO resource index in ascending order.

[0169] It should be noted that the SSB cycle, PRACH configuration cycle, and PRACH association cycle shown in Figure 7 are merely exemplary descriptions, and the embodiments disclosed herein do not impose any particular limitations on them.

[0170] In some embodiments, the terminal selects one RO resource from the RO resources associated with the first reference location as the first PRACH resource to be used by the terminal, based on the first PRACH resource configuration associated with the first reference location.

[0171] In some embodiments, the terminal selects a candidate sequence from the candidate sequences associated with the first reference location as the first PRACH resource to be used by the terminal, based on the first PRACH resource configuration associated with the first reference location.

[0172] In some embodiments, the terminal selects an RO resource from the RO resources associated with the first reference location and a candidate sequence from the candidate sequences associated with the first reference location, based on the first PRACH resource configuration associated with the first reference location, and uses the selected RO resource and the selected candidate sequence as the first PRACH resource used by the terminal.

[0173] For example, as shown in Figure 7, the terminal receives broadcast information on the wide beam corresponding to SSB#0, determines the first reference location as reference location#1 based on the location of the terminal, configures the PRACH resource associated with the first reference location#1 as PRACH config#1, and determines the first PRACH resource to be used as RO#1 and preamble#1 (preamble#1 is a candidate sequence associated with reference location#1).

[0174] In some embodiments, the terminal calculates the distance between its location and each reference location; and selects the closest reference location as the first reference location associated with the terminal's location.

[0175] For example, Figure 8 is a schematic diagram illustrating the determination of associated reference locations based on the geographic location of a terminal according to an embodiment of the present disclosure. As shown in Figure 8, reference location#1 and reference location#2 correspond to narrow beam#1 and narrow beam#2, respectively. The terminal can calculate the distance between its location and each reference location using the following formula:

[0176]

[0177] Where (x,y) represents the coordinates of the terminal's current location, (x,y) r ,y r ) represents the coordinates of the reference location, and d represents the distance between the terminal's current location and the reference location. It should be noted that, for ease of description, Figure 8 does not show the coordinates of each of the multiple reference locations in detail, which does not impose any particular limitation on the embodiments of this disclosure. As shown in Figure 8, because d1 < d2 (d1 is also less than d0 and d3), the terminal selects the nearest reference location #1 as the first reference location associated with the terminal's current location.

[0178] In a further embodiment, when the beam switching condition is met, the terminal determines a second reference position associated with its location among multiple reference positions, wherein the second reference position is different from the first reference position; based on the second PRACH resource configuration associated with the second reference position, the terminal determines the second PRACH resource to be used; and sends a second random access request message to the network device on the second PRACH resource.

[0179] For example, as shown in Figure 8, a terminal may move from the coverage area of ​​narrow beam #1 to the coverage area of ​​narrow beam #2. When the beam switching conditions are met, the terminal can determine the associated second reference location as reference location #2 based on its current location. Furthermore, based on the PRACH resource configuration associated with the second reference location as PRACH config #2, the terminal can determine the second PRACH resource to use. Furthermore, the terminal can initiate a random access procedure on the determined second PRACH resource, that is, the terminal can send Msg.1 to the network device on the second PRACH resource.

[0180] In the above embodiments, after the location of the terminal changes, the method by which the terminal determines the second reference position can be referred to the relevant embodiments of the terminal determining the first reference position mentioned above, and will not be repeated here.

[0181] In some embodiments, the second random access request message is carried by a narrow beam. In some embodiments, the second random access request message is carried by the narrow beam corresponding to the second reference position. In the above embodiments, by sending the second random access request message on the second PRACH resource, the terminal can instruct the network device to decide to switch to the narrow beam corresponding to the second reference position.

[0182] In some embodiments, satisfying the beam switching conditions includes at least one of the following: the distance between the location of the terminal and the first reference location is greater than or equal to a first threshold; the distance between the location of the terminal and the second reference location is less than or equal to a second threshold; the distance between the location of the terminal and the first reference location is greater than or equal to the first threshold, and the duration of the distance between the location of the terminal and the first reference location being greater than or equal to the first threshold is greater than or equal to a third threshold; the distance between the location of the terminal and the second reference location is less than or equal to the second threshold, and the duration of the distance between the location of the terminal and the second reference location being less than or equal to the second threshold is greater than or equal to a fourth threshold.

[0183] For example, the distance between the terminal's location and the first reference location is d1, and the first threshold value is D1; ​​if d1≥D1, then the beam switching condition is met, and the terminal determines the second reference location based on its current location.

[0184] For example, the distance between the terminal's location and the second reference location is d2, and the second threshold value is D2; if d2≤D2, then the beam switching condition is met, and the terminal determines the second reference location based on its current location.

[0185] For example, the distance between the terminal's location and the first reference location is d1, the first threshold value is D1, and the third threshold value is T1; if d1≥D1, and the duration of this state is greater than or equal to T1, then the beam switching condition is met, and the terminal determines the second reference location based on its current location.

[0186] For example, the distance between the terminal's location and the second reference location is d2, the second threshold value is D2, and the fourth threshold value is T2; if d2≤D2, and the duration of this state is greater than or equal to T2, then the beam switching condition is met, and the terminal determines the second reference location based on its current location.

[0187] In some embodiments, the terminal receives a second random access request response message sent by the network device. Optionally, the network device sends a second random access request response message to the terminal.

[0188] In the above embodiments, through the second random access request response message, the terminal can determine that the network device has been informed of the switch to the narrow beam corresponding to the second reference position, and that random access between the terminal and the network device has been completed. In a further embodiment, the terminal and the network device can use the narrow beam corresponding to the second reference position for uplink and downlink data transmission.

[0189] In some embodiments, the terminal detects the corresponding PDCCH according to the recoverySearchSpace within the configured BFR-CORESET resource to receive a second random access request response message sent by the network device, wherein the BFR-CORESET resource is used to transmit the beam failure recovery request response message, and the PDCCH is used to transmit the beam failure recovery request response message.

[0190] In some embodiments, the configuration of BFR-CORESET resources and the configuration of the recovery search space are independent of the beam skipping mechanism, and the recovery search space ensures that there is a corresponding detection opportunity during the lighting period of all beams.

[0191] In the above embodiments, as the terminal and / or satellite move continuously, when the terminal determines that the beam switching conditions are met, it can determine the associated second reference position based on its own location, and determine the second PRACH resource to be used by the terminal based on the second PRACH resource configuration associated with the second reference position. It then initiates a random access procedure on the second PRACH resource, allowing the terminal to independently decide which narrow beam to switch to corresponds to the second reference position, and informs the network device of this decision. Therefore, since the terminal does not need to perform reference signal measurement and report measurement data, the beam switching / beam failure recovery mechanism can be implemented, which helps reduce the latency of the entire beam switching / beam failure recovery process.

[0192] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0193] In some embodiments, the names of information, etc., are not limited to the names described in the embodiments. Terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0194] In some embodiments, terms such as “moment,” “point in time,” “time,” and “time location” can be used interchangeably, as can terms such as “duration,” “segment,” “time window,” “window,” and “time.”

[0195] In some embodiments, the terms "component carrier (CC)," "cell," "frequency carrier," and "carrier frequency" can be used interchangeably.

[0196] In some embodiments, “get,” “obtain,” “receive,” “transmit,” “bidirectional transmission,” and “send and / or receive” can be used interchangeably and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining through self-processing, or autonomous implementation, among other meanings.

[0197] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transfer,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0198] This disclosure also provides a random access method.

[0199] In some embodiments, the terminal determines the PRACH resources and / or preamble it uses by using multiple reference location information in the obtained broadcast information.

[0200] The broadcast information can be either SIB1 or SIB19 information, which is transmitted via a wide beam.

[0201] The sequence can be transmitted using a narrow beam.

[0202] Optionally, multiple reference positions can be indicated by LCS or GCS, specifically in the form of coordinates (x,y).

[0203] Optionally, the PRACH config associated with each reference location is explicitly configured. The PRACH config includes available RO resources and their corresponding sequences, i.e., candidate sequences.

[0204] Optionally, each reference location is implicitly configured with a PRACH config. The PRACH config includes available RO resources and their corresponding sequences. For example, if multiple reference locations are configured under the current SSB's wide beam, then the index number (index x) of each reference location corresponds to a subset i of all RACH resources N (where N is the number of reference locations) corresponding to the SSB, meaning their indices are equal, and location reference#i corresponds to RACH resource#i. For example, all RACH resources are sorted first by sequence, then by RO resources.

[0205] Optionally, the terminal determines its associated reference location based on its own location and selects the corresponding RACH resource to initiate random access, that is, it randomly selects a RO within the corresponding associated resource and selects a corresponding preamble to initiate the random access process (sending Msg.1).

[0206] Specifically, it is determined by the minimum distance between the terminal's own coordinates obtained from the Global Navigation Satellite System (GNSS) and all obtained reference position coordinates.

[0207] In some embodiments, if a terminal determines that its beam needs to be switched or restored, the terminal determines a new reference position by changing its own position.

[0208] Optionally, assuming the current associated reference position of the terminal is the first reference position, the triggering conditions for determining beam switching or beam failure can be: the distance between the terminal and the first reference position is greater than or equal to a first distance threshold; and / or, the distance between the terminal and the second reference position is less than or equal to a second distance threshold; and / or, the duration of the above state is greater than or equal to a time length threshold. The first distance threshold and the second distance threshold can be equal or unequal.

[0209] Optionally, after the above triggering conditions are met, the terminal sends Msg.1 on the RACH resource associated with the second reference position, that is, initiates the RACH process.

[0210] Optionally, the terminal receives Msg.2 by detecting the corresponding PDCCH based on the recoverySearchSpace within the configured BFR-CORESET resources.

[0211] The configuration of BFR-CORESET and recoverySearchSpace is independent of the beam skipping mechanism, and recoverySearchSpace ensures that there is a corresponding detection opportunity during the dwell time of all beams.

[0212] In the above embodiments, please refer to the steps and their optional implementation methods in other embodiments described before or after this embodiment, as well as other related parts in the specification, which will not be repeated here.

[0213] This disclosure also proposes an apparatus (also referred to as a communication device, etc.) for implementing any of the above methods. For example, an apparatus is proposed that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Furthermore, another apparatus is proposed that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0214] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0215] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0216] Figure 9A is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure. As shown in Figure 9A, the terminal 9100 may include at least one of a processing module 9101 and a transceiver module 9102.

[0217] In some embodiments, the processing module is configured to determine a first reference location associated with the location of the device among a plurality of reference locations; the processing module is configured to determine a first PRACH resource used by the device based on a first PRACH resource configuration associated with the first reference location; and the transceiver module is configured to send a first random access request message to a network device on the first PRACH resource.

[0218] Optionally, the transceiver module is used to perform at least one of the communication steps (such as steps S503, S506, S603) performed by terminal 101 in any of the above methods, which will not be elaborated here.

[0219] Optionally, the above processing module is used to execute at least one of the other steps (e.g., steps S502, S505, S601, S602) executed by terminal 101 in any of the above methods, which will not be elaborated here.

[0220] Figure 9B is a schematic diagram of a network device according to an embodiment of the present disclosure. As shown in Figure 9B, the network device 9200 may include a transceiver module 9201.

[0221] In some embodiments, the transceiver module is configured to receive a first random access request message sent by a terminal on a first PRACH resource; wherein the first PRACH resource is determined by the terminal according to a first PRACH resource configuration associated with a first reference location, and the first reference location is associated with the location of the terminal.

[0222] Optionally, the transceiver module is used to perform at least one of the communication steps (such as steps S501, S504, S507) performed by the network device 102 in any of the above methods, which will not be elaborated here.

[0223] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, which may be separate or integrated. Optionally, the transceiver module may be interchangeable with a transceiver.

[0224] In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the multiple sub-modules may each perform all or part of the steps required by the processing module.

[0225] In some embodiments, the processing module can be replaced by the processor, and the transceiver module can be replaced by the transceiver.

[0226] Figure 10A is a schematic diagram of the structure of the communication device 10100 proposed in an embodiment of this disclosure. The communication device 10100 can be a network device (e.g., access network device, core network device, etc.), a terminal (e.g., user equipment, etc.), a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 10100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0227] As shown in Figure 10A, the communication device 10100 is used to execute any of the above methods. In some embodiments, the communication device 10100 includes one or more processors 10101. The processor 10101 may be a general-purpose processor or a special-purpose processor, such as a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. Optionally, the communication device 10100 is used to execute any of the above methods. Optionally, one or more processors 10101 are used to invoke instructions to cause the communication device 10100 to execute any of the above methods.

[0228] In some embodiments, the communication device 10100 further includes one or more transceivers 10102. When the communication device 10100 includes one or more transceivers 10102, the transceiver 10102 performs at least one of the communication steps such as sending and / or receiving in the above method (e.g., steps S501, S503, S504, S506, S507, S603, but not limited thereto), and the processor 10101 performs at least one of other steps (e.g., steps S502, S505, S601, S602, but not limited thereto). In optional embodiments, the transceiver may include a receiver and / or a transmitter, which may be separate or integrated together. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc., can be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., can be used interchangeably; the terms receiver, receiving unit, receiver, receiving circuit, etc., can be used interchangeably.

[0229] In some embodiments, the communication device 10100 further includes one or more memories 10103 for storing data and / or instructions. Optionally, one or more processors 10101 are used to invoke instructions stored in the memory 10103 to cause the communication device 10100 to perform any of the above methods. Optionally, all or part of the memory 10103 may also be located outside the communication device 10100. In an optional embodiment, the communication device 10100 may include one or more interface circuits 10104. Optionally, the interface circuit 10104 is connected to the memory 10102, and the interface circuit 10104 can be used to receive data and / or instructions from the memory 10102 or other devices, and can be used to send data and / or instructions to the memory 10102 or other devices. For example, the interface circuit 10104 can read data and / or instructions stored in the memory 10102 and send the data and / or instructions to the processor 10101.

[0230] The communication device 10100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 10100 described in this disclosure is not limited thereto, and the structure of the communication device 10100 may not be limited by FIG10A. The communication device may be a standalone device or may be part of a larger device. For example, the communication device may be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally, the IC collection may also include storage components for storing data, programs and / or instructions; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0231] Figure 10B is a schematic diagram of the structure of chip 10200 according to an embodiment of this disclosure. For cases where the communication device 10100 can be a chip or a chip system, please refer to the schematic diagram of chip 10200 shown in Figure 10B, but it is not limited thereto.

[0232] Chip 10200 includes one or more processors 10201. Chip 10200 is used to perform any of the above methods.

[0233] In some embodiments, chip 10200 further includes one or more interface circuits 10202. Optionally, terms such as interface circuit, interface, and transceiver pin can be used interchangeably. In some embodiments, chip 10200 further includes one or more memories 10203 for storing data and / or instructions. Optionally, all or part of the memories 10203 may be located outside of chip 10200. Optionally, interface circuit 10202 is connected to memory 10203, and interface circuit 10202 can be used to receive data and / or instructions from memory 10203 or other devices, and interface circuit 10202 can be used to send data and / or instructions to memory 10203 or other devices. For example, interface circuit 10202 can read data and / or instructions stored in memory 10203 and send the data and / or instructions to processor 10201.

[0234] In some embodiments, the interface circuit 10202 performs at least one of the communication steps such as sending and / or receiving in the above-described method (e.g., steps S501, S503, S504, S506, S507, S603, but not limited thereto). The interface circuit 10202 performing the communication steps such as sending and / or receiving in the above-described method refers, for example, to the interface circuit 10202 performing data and / or instruction interaction between the processor 10201, the chip 10200, the memory 10203, or the transceiver device. In some embodiments, the processor 10201 performs at least one of other steps (e.g., steps S502, S505, S601, S602, but not limited thereto).

[0235] The modules and / or devices described in the various embodiments, such as virtual devices, physical devices, and chips, can be combined or separated arbitrarily as needed. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0236] This disclosure also proposes a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0237] This disclosure also proposes a program product, including a program and / or instructions, which, when executed by a communication device, cause the communication device to perform any of the above methods. Optionally, the program product is a computer program product. Optionally, the program product is stored on the storage medium.

[0238] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A random access method, characterized in that, The method, executed by a terminal, includes: Determine a first reference location among multiple reference locations that is associated with the location of the terminal; The first PRACH resource used by the terminal is determined based on the first physical random access channel (PRACH) resource configuration associated with the first reference location; Send a first random access request message to the network device on the first PRACH resource.

2. The method according to claim 1, characterized in that, The method further includes: The network device receives broadcast information, which includes the plurality of reference locations.

3. The method according to claim 2, characterized in that, The broadcast information includes system message block SIB1 information or SIB19 information.

4. The method according to any one of claims 1 to 3, characterized in that, The method further includes: Receive the first random access request response message sent by the network device.

5. The method according to any one of claims 1 to 4, characterized in that, The PRACH resource configuration associated with each reference location includes at least one of the following: Available random access opportunities (RO) resources; Candidate sequences.

6. The method according to claim 5, characterized in that, The step of determining the first PRACH resource used by the terminal based on the first PRACH resource configuration associated with the first reference location includes at least one of the following: Based on the first PRACH resource configuration associated with the first reference location, select one RO resource from the RO resources associated with the first reference location as the first PRACH resource used by the terminal; Based on the first PRACH resource configuration associated with the first reference location, a candidate sequence is selected from the candidate sequences associated with the first reference location as the first PRACH resource used by the terminal.

7. The method according to any one of claims 1 to 6, characterized in that, Determining the first reference location associated with the location of the terminal among multiple reference locations includes: Calculate the distance between the location of the terminal and each reference location; Select the nearest reference location as the first reference location associated with the location of the terminal.

8. The method according to any one of claims 1 to 7, characterized in that, The method further includes: If the beam switching condition is met, a second reference position associated with the location of the terminal is determined from the plurality of reference positions, wherein the second reference position is different from the first reference position; The second PRACH resource used by the terminal is determined based on the second PRACH resource configuration associated with the second reference location; Send a second random access request message to the network device on the second PRACH resource.

9. The method according to claim 8, characterized in that, The beam switching condition is satisfied, including at least one of the following: The distance between the location of the terminal and the first reference location is greater than or equal to the first threshold value; The distance between the location of the terminal and the second reference location is less than or equal to the second threshold value; The distance between the location of the terminal and the first reference location is greater than or equal to a first threshold value, and the duration of the distance between the location of the terminal and the first reference location being greater than or equal to the first threshold value is greater than or equal to a third threshold value. The distance between the location of the terminal and the second reference location is less than or equal to a second threshold value, and the duration during which the distance between the location of the terminal and the second reference location is less than or equal to the second threshold value is greater than or equal to a fourth threshold value.

10. The method according to any one of claims 8 to 9, characterized in that, The method further includes: Receive the second random access request response message sent by the network device.

11. The method according to claim 10, characterized in that, The receipt of the second random access request response message sent by the network device includes: Within the configured beam failure recovery control resource set (BFR-CORESET), the corresponding physical downlink control channel (PDCCH) is detected according to the recovery search space (recoverySearchSpace) to receive the second random access request response message sent by the network device. The BFR-CORESET resource is used to transmit the beam failure recovery request response message, and the PDCCH is used to transmit the beam failure recovery request response message.

12. The method according to any one of claims 1 to 11, characterized in that, The multiple reference positions are indicated based on a local coordinate system or a global coordinate system.

13. A random access method, characterized in that, Performed by a network device, the method includes: Receive the first random access request message sent by the terminal on the first PRACH resource; The first PRACH resource is determined by the terminal based on the configuration of the first PRACH resource associated with the first reference position, which is associated with the location of the terminal.

14. The method according to claim 13, characterized in that, The method further includes: A broadcast message is sent, which includes multiple reference locations.

15. The method according to claim 14, characterized in that, The broadcast information includes SIB1 information or SIB19 information.

16. The method according to any one of claims 13 to 15, characterized in that, The method further includes: Send a first random access request response message to the terminal.

17. The method according to any one of claims 13 to 16, characterized in that, The method further includes: Send the first PRACH resource configuration associated with the first reference location to the terminal.

18. The method according to any one of claims 13 to 17, characterized in that, The PRACH resource configuration associated with each reference location includes at least one of the following: Available RO resources; Candidate sequences.

19. The method according to claim 18, characterized in that, The first PRACH resource includes at least one of the following: Any RO resource associated with the first reference location; Any candidate sequence associated with the first reference position.

20. The method according to any one of claims 14 to 19, characterized in that, Of the plurality of reference locations, the first reference location is closest to the location of the terminal.

21. The method according to claims 13 to 20, characterized in that, The method further includes: Receive the second random access request message sent by the terminal on the second PRACH resource; The second PRACH resource is determined by configuring the second PRACH resource associated with the second reference position when the terminal meets the beam switching conditions. The second reference position is associated with the location of the terminal and is different from the first reference position.

22. The method according to claim 21, characterized in that, The method further includes: Send a second random access request response message to the terminal.

23. The method according to any one of claims 13 to 22, characterized in that, The multiple reference positions are indicated based on a local coordinate system or a global coordinate system.

24. A communication device, characterized in that, The communication device is used to execute the random access method according to any one of claims 1-12 and 13-23.

25. A communication system, characterized in that, The device includes a terminal and a network device, wherein the terminal is configured to implement the random access method according to any one of claims 1-12, and the network device is configured to implement the random access method according to any one of claims 13-23.

26. A storage medium storing instructions, characterized in that, When the instructions are executed on the communication device, the communication device performs the method as described in any one of claims 1-12 or 13-23.

27. A program product comprising at least one of a program and instructions, characterized in that, When at least one of the programs or instructions is executed by the communication device, it implements the steps of the method according to any one of claims 1-12 or 13-23.

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