Initial access method, terminal equipment and network equipment

Abstract

Embodiments of the present application provide an initial access method, terminal device, and network device that can avoid access delay of the terminal device and avoid PRACH collision on the initial uplink BWP. The initial access method includes: the terminal device performs initial access according to a first association relationship and / or a second association relationship, the first association relationship including an association relationship between an initial downlink BWP and an uplink BWP, and the second association relationship including an association relationship between a common search space set and a downlink BWP; wherein, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two SSBs on the initial downlink BWP are associated with different uplink BWPs; and in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, or the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and more specifically, to an initial access method, a terminal device, and a network device. Background Art

[0002] The fifth-generation mobile communication technology, 5G NR (New Radio), defines deployment scenarios for non-terrestrial networks (NTNs), including satellite networks. Leveraging satellite's wide-area coverage, NTNs enable 5G NR service continuity. However, initial access in NTN scenarios remains a pressing issue. Summary of the Invention

[0003] The embodiments of the present application provide an initial access method, terminal device, and network device that can avoid excessive load on the initial downlink BWP caused by terminal devices in multiple terrestrial cells all accessing the network through the same initial downlink BWP, thereby avoiding increased access latency for the terminal devices. Furthermore, the method can support terminal devices in multiple terrestrial cells initiating random access through different initial uplink BWPs, thereby avoiding severe PRACH collisions on the initial uplink BWP.

[0004] In a first aspect, an initial access method is provided, the method comprising:

[0005] The terminal device performs initial access according to the first association relationship and / or the second association relationship, the first association relationship includes an association relationship between the initial downlink BWP and the uplink BWP, and the second association relationship includes an association relationship between the common search space set and the downlink BWP;

[0006] in,

[0007] In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two SSBs on the initial downlink BWP are associated with different uplink BWPs;

[0008] In the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, or the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP.

[0009] In a second aspect, an initial access method is provided, the method comprising:

[0010] The network device sends first information to the terminal device, where the first information is used to determine a first association relationship and / or a second association relationship for the terminal device to perform initial access, where the first association relationship includes an association relationship between an initial downlink BWP and an uplink BWP, and the second association relationship includes an association relationship between a common search space set and a downlink BWP; wherein,

[0011] In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two SSBs on the initial downlink BWP are associated with different uplink BWPs;

[0012] In the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, or the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP.

[0013] In a third aspect, a terminal device is provided for executing the method in the first aspect.

[0014] Specifically, the terminal device includes a functional module for executing the method in the above-mentioned first aspect.

[0015] In a fourth aspect, a network device is provided for executing the method in the second aspect.

[0016] Specifically, the network device includes a functional module for executing the method in the above second aspect.

[0017] In a fifth aspect, a terminal device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to perform the method in the first aspect.

[0018] In a sixth aspect, a network device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to perform the method in the second aspect.

[0019] In a seventh aspect, a device is provided for implementing the method in any one of the first to second aspects above.

[0020] Specifically, the apparatus includes: a processor, configured to call and run a computer program from a memory, so that a device equipped with the apparatus executes the method in any one of the first to second aspects described above.

[0021] In an eighth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program enables a computer to execute the method in any one of the first to second aspects above.

[0022] In a ninth aspect, a computer program product is provided, comprising computer program instructions, wherein the computer program instructions enable a computer to execute the method in any one of the first to second aspects above.

[0023] In a tenth aspect, a computer program is provided, which, when executed on a computer, enables the computer to execute the method in any one of the first to second aspects above.

[0024] Through the above technical solution, the terminal device can perform initial access based on the first association relationship and / or the second association relationship, thereby avoiding excessive load on the initial downlink BWP caused by terminal devices in multiple terrestrial cells accessing the network through the same initial downlink BWP, thereby avoiding increasing the access delay of the terminal device. In addition, terminal devices in multiple terrestrial cells can be supported to initiate random access through different initial uplink BWPs, thereby avoiding serious PRACH collisions on the initial uplink BWP. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A-Figure 1C It is a schematic diagram of an application scenario provided by an embodiment of the present application.

[0026] Figure 2 This is a schematic diagram of the mapping relationship between SSB and RO provided in this application.

[0027] Figure 3 This is a schematic diagram of a beam layout of an NTN network provided by this application.

[0028] Figure 4 This is a schematic diagram of another beam layout of an NTN network provided by this application.

[0029] Figure 5 This is a schematic flowchart of an initial access method provided according to an embodiment of the present application.

[0030] Figure 6 It is a schematic diagram of a first association relationship provided according to an embodiment of the present application.

[0031] Figure 7 It is a schematic diagram of another first association relationship provided according to an embodiment of the present application.

[0032] Figure 8 It is a schematic diagram of a second association relationship provided according to an embodiment of the present application.

[0033] Figure 9 It is a schematic diagram of another second association relationship provided according to an embodiment of the present application.

[0034] Figure 10This is a schematic flowchart of another initial access method provided according to an embodiment of the present application.

[0035] Figure 11 This is a schematic block diagram of a terminal device provided according to an embodiment of the present application.

[0036] Figure 12 This is a schematic block diagram of a network device provided according to an embodiment of the present application.

[0037] Figure 13 This is a schematic block diagram of a communication device provided according to an embodiment of the present application.

[0038] Figure 14 This is a schematic block diagram of a device provided according to an embodiment of the present application.

[0039] Figure 15 It is a schematic block diagram of a communication system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. With respect to the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity) system. Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

[0042] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, etc. The embodiments of the present application can also be applied to these communication systems.

[0043] In some embodiments, the communication system in the embodiments of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0044] In some embodiments, the communication system in the embodiments of the present application can be applied to an unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiments of the present application can also be applied to an authorized spectrum, where the authorized spectrum can also be considered as an unshared spectrum.

[0045] In some embodiments, the communication system in the embodiments of the present application can be applied to the FR1 frequency band (corresponding to the frequency band range of 410MHz to 7.125GHz), can also be applied to the FR2 frequency band (corresponding to the frequency band range of 24.25GHz to 52.6GHz), and can also be applied to new frequency bands such as high-frequency bands corresponding to the frequency band range of 52.6GHz to 71GHz.

[0046] In some embodiments, the embodiments of the present application may be applied to non-terrestrial networks (NTN) systems, as well as to terrestrial networks (TN) systems.

[0047] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, wherein the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0048] The terminal device can be a station (ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc.

[0049] In an embodiment of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0050] In the embodiments of the present application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, or a wireless terminal device in smart home, etc. The terminal device involved in the embodiments of the present application may also be referred to as a terminal, user equipment (UE), an access terminal device, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a mobile station, a remote station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE device, etc. The terminal device may also be fixed or mobile.

[0051] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0052] In an embodiment of the present application, the network device may be a device for communicating with a mobile device. The network device may be an access point (AP) in WLAN, a base station (BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, an evolved base station (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in an NR network, or a network device in a future evolved PLMN network or a network device in an NTN network, etc.

[0053] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Alternatively, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station set up in a location such as land or water.

[0054] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0055] For example, Figure 1A This is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. Figure 1A As shown, the communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographic area and may communicate with terminal devices within the coverage area.

[0056] Figure 1AOne network device and two terminal devices are shown as an example. Optionally, the communication system 100 may include multiple network devices and each network device may include another number of terminal devices within its coverage area. This embodiment of the present application does not limit this.

[0057] For example, Figure 1B This is a schematic diagram of another communication system architecture provided by an embodiment of the present application. Figure 1B , including terminal device 1101 and satellite 1102, terminal device 1101 and satellite 1102 can communicate wirelessly. The network formed between terminal device 1101 and satellite 1102 can also be called NTN. Figure 1B In the illustrated communication system architecture, satellite 1102 can function as a base station, enabling direct communication between terminal device 1101 and satellite 1102. In this system architecture, satellite 1102 can be referred to as a network device. Optionally, the communication system can include multiple network devices 1102, and each network device 1102 can include a different number of terminal devices within its coverage area, although this is not limited in this embodiment of the present application.

[0058] For example, Figure 1C This is a schematic diagram of another communication system architecture provided by an embodiment of the present application. Figure 1C , including terminal equipment 1201, satellite 1202 and base station 1203, terminal equipment 1201 and satellite 1202 can communicate wirelessly, and satellite 1202 and base station 1203 can communicate. The network formed by terminal equipment 1201, satellite 1202 and base station 1203 can also be called NTN. Figure 1C In the illustrated communication system architecture, satellite 1202 may not function as a base station, and communication between terminal device 1201 and base station 1203 must be relayed through satellite 1202. In this system architecture, base station 1203 can be referred to as a network device. Optionally, the communication system may include multiple network devices 1203, and each network device 1203 may include a different number of terminal devices within its coverage area, which is not limited in this embodiment of the present application.

[0059] It should be noted that Figure 1A-Figure 1C The system to which the present application is applicable is only illustrated in the form of an example. Of course, the method shown in the embodiment of the present application can also be applied to other systems, such as 5G communication systems, LTE communication systems, etc., and the embodiment of the present application does not make specific limitations on this.

[0060] Optionally, Figure 1A-Figure 1CThe wireless communication system shown may also include other network entities such as a mobility management entity (MME) and an access and mobility management function (AMF), but this embodiment of the present application does not limit this.

[0061] It should be understood that the device with communication function in the network / system in the embodiment of the present application can be called a communication device. Figure 1A Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above and will not be repeated here; the communication equipment may also include other devices in the communication system 100, such as a network controller, a mobile management entity and other network entities, which is not limited in the embodiments of the present application.

[0062] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or" is simply a description of an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " generally indicates that the related objects are in an "or" relationship.

[0063] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0064] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0065] In the embodiments of the present application, "predefined" can be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (for example, a terminal device and a network device). The present application does not limit the specific implementation method. For example, predefined can refer to information defined in a protocol.

[0066] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0067] To facilitate a better understanding of the embodiments of the present application, the NTN related to the present application is explained.

[0068] NTN generally uses satellite communications to provide communications services to terrestrial users. Compared to terrestrial cellular networks, satellite communications offer many unique advantages. First, satellite communications are not restricted by user location. For example, conventional terrestrial communications cannot cover areas such as oceans, high mountains, and deserts where communications equipment cannot be deployed or where there is a sparse population. However, satellite communications, because a single satellite can cover a large area and orbits the Earth, theoretically every corner of the globe can be covered. Second, satellite communications have significant social value. Satellite communications can provide low-cost coverage in remote mountainous areas and poor, underdeveloped countries and regions, enabling people in these areas to enjoy advanced voice communications and mobile internet technologies, helping to narrow the digital divide with developed regions and promoting their development. Third, satellite communications offer long range, and the cost of communications does not increase significantly with increasing distance. Finally, satellite communications are highly stable and unaffected by natural disasters.

[0069] Communication satellites are divided into low-Earth orbit (LEO) satellites, medium-Earth orbit (MEO) satellites, geostationary Earth orbit (GEO) satellites, high elliptical orbit (HEO) satellites, etc. according to their orbital altitudes.

[0070] Low Earth Orbit (LEO) satellites have an altitude range of 500 km to 1500 km, corresponding to an orbital period of approximately 1.5 to 2 hours. Signal propagation delay for single-hop communication between users is typically less than 20 milliseconds, and the maximum satellite visibility time is 20 minutes. The short signal propagation distance and low link loss reduce the transmit power requirements of user terminal devices.

[0071] Geosynchronous Earth Orbit (GEO) satellites orbit at an altitude of 35,786 km and revolve around the Earth every 24 hours. The signal propagation delay for single-hop communication between users is typically 250 milliseconds.

[0072] In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers.

[0073] To facilitate a better understanding of the embodiments of the present application, the initial access process in the NR system related to the present application is described.

[0074] In the NR system, the initial access process of the terminal device can be completed by detecting the synchronization signal block (SSB or SS / PBCH block) burst set. An SSB burst set can include one or more SSBs, where an SSB includes 4 symbols in the time domain. An SSB burst set should be transmitted within one half frame (5ms).

[0075] For the frequency range 1 (FR1) band, there are a maximum of 8 SSBs in an SSB burst set, and a maximum of 3 bits are required to indicate the indexes of these 8 SSBs. These 3 bits are implicitly carried by the demodulation reference signal (DMRS) sequence of the physical broadcast channel (PBCH). There are 8 different PBCH DMRS sequences, corresponding to 8 different SSB indices. For the frequency range 2 (FR2) band, a maximum of 64 SSBs can be configured, and 6 bits are required to indicate the indexes of these 64 SSBs. The lower 3 bits of these 6 bits are still carried by the PBCH DMRS sequence, and the additional upper 3 bits are directly indicated by the payload content of the PBCH.

[0076] One of the main functions of the SSB index is to allow the UE to obtain system timing information. In addition, the SSB index has another function, which is to indicate the Quasi Co-location (QCL) relationship between SSBs. The QCL relationship between signals is used to describe the similarity of their large-scale parameter characteristics. If there is a QCL relationship between two signals, the large-scale parameters of the two signals can be considered to be similar. Specifically for SSBs, in the 5G NR system, SSBs carried by different beams constitute an SSB burst set. Different SSB indexes correspond to different SSB time domain position information within the burst set, and also correspond to specific SSB transmission beam information. SSBs with the same SSB index can be considered to have a QCL relationship, and the terminal device can assume that the network device uses the same beam to transmit these SSBs; SSBs corresponding to different SSB indices are not considered to have a QCL relationship, because they may come from different transmission beams of the network device and experience different channel transmission characteristics.

[0077] During the initial access process, the terminal device attempts to search for the SSB through the predefined possible time-frequency positions of the SSB, and obtains time and frequency synchronization, radio frame timing, and cell identification (ID) through the detected SSB. The terminal device can also obtain resource configuration during the random access process based on the system message received from the cell. Random access is a very important process in the initial access process. In addition to completing functions such as establishing a radio resource control (RRC) connection, maintaining uplink synchronization, and cell switching, the random access process also undertakes functions such as beam management and system message requests.

[0078] The resource configuration in the random access process includes the physical random access channel (PRACH) resource configuration, also known as the PRACH transmission opportunity (RO). The RO is the time-frequency resource that carries the random access preamble sequence (Preamble). If the two-step random access process transmission is supported, the resource configuration in the random access process also includes the physical uplink shared channel (PUSCH) resource configuration, also known as the PUSCH transmission opportunity (PO). Among them, the message A (MsgA) in the two-step random access process includes the MsgA Preamble and the MsgA PUSCH. The RO is the time-frequency resource used to carry the MsgA Preamble, and the PO is the time-frequency resource used to carry the MsgA PUSCH.

[0079] The NR system is characterized by supporting downlink multi-beams. Before the network device communicates with the terminal device, the network device needs to know the beam where the terminal device is located and then set the appropriate beam direction in the subsequent data transmission process. Since the PRACH in the random access process is the first information sent by the terminal device to the network device, the function of reporting the beam where the terminal device is located can be carried by the PRACH. Specifically, it can be determined by the mapping relationship between SSB and RO. Among them, in the NR system, the following multiple mapping ratios between SSB and RO are supported: 1) one-to-one mapping; 2) many-to-one mapping; 3) one-to-many mapping. Figure 2 A schematic diagram of the mapping relationship between SSB and RO is provided, where the SSB is on the initial downlink bandwidth part (BWP) (i.e., downlink BWP#0), and the RO is on the initial uplink BWP (i.e., uplink BWP#0). SSB and RO with the same pattern indicate a mapping relationship.

[0080] Before the terminal device initiates random access, the terminal device will measure and evaluate the signal quality of the cell and the signal strength of each SSB in the cell. When the SSB signal detection strength exceeds the threshold, the SSB with the strongest or stronger signal is determined. For example, after the terminal device determines that SSB#1 is the SSB with the strongest signal, the terminal device determines that the PRACH transmission opportunity corresponding to the SSB#1 includes RO#1 based on the mapping relationship between SSB and RO, and sends the Preamble on the RO#1. If the network device successfully receives the Preamble, the network device can obtain the SSB selected by the terminal device based on the resource information of the successful reception of the Preamble. For example, the network device can determine that the Preamble is associated with the SSB#1 based on the association relationship, so that the beam information corresponding to the subsequent communication can be determined based on the SSB#1.

[0081] The four-step random access procedure (Type-1 random access procedure) may include the following steps:

[0082] In the first step, the terminal device sends a random access preamble sequence (Preamble, also called Msg1) to the network device on the PRACH resource on the initial uplink BWP.

[0083] In the second step, after detecting Msg1, the network device sends a physical downlink control channel (PDCCH) scrambled with a random access radio network temporary identity (RA-RNTI) to the terminal device through the resources in the Type 1-PDCCH common search space (CSS) on the initial downlink BWP. The PDSCH scheduled by the PDCCH may include the random access response (RAR, also known as Msg2) corresponding to the Preamble sent by the terminal device. Accordingly, the terminal device uses RA-RNTI to detect PDCCH on the Type 1-PDCCH CSS on the initial downlink BWP, and after detecting the PDCCH, determines whether the random access response (RAR) sent by the network device to itself is included according to the physical downlink shared channel (PDSCH) scheduled by the PDCCH. The RAR may include information such as the uplink grant of Msg3, the timing advance command (TA command), and the temporary cell radio network temporary identity (TC-RNTI). The Type 1-PDCCH CSS is configured by network equipment through system messages and / or higher-layer parameters.

[0084] In the third step, after receiving the RAR, the terminal device sends Msg3 on the uplink resources indicated by the RAR. This step supports Hybrid Automatic Repeat reQuest (HARQ) retransmission. If the network device does not correctly receive Msg3, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg3. The PDCCH can carry the corresponding downlink control information (DCI) format 0_0.

[0085] In the fourth step, the network device sends message 4 (Msg4) to the terminal device, which includes a contention resolution message. This step supports HARQ retransmission. If the terminal device does not correctly receive Msg4, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg4. Among them, the PDCCH can carry the DCI corresponding to DCI format 1_0. If the terminal device correctly receives Msg4 and determines that the Msg4 is the message of the terminal device, the random access process of the terminal device is successful, otherwise the random access process fails. The terminal device needs to initiate the random access process again from the first step.

[0086] The two-step random access procedure (Type-2 random access procedure) may include the following steps:

[0087] In the first step, the terminal device sends a message A (MsgA) to the network device on the RO and PO on the initial uplink BWP, where the MsgA includes the MsgA Preamble and the MsgA PUSCH.

[0088] In the second step, after detecting MsgA, the network device sends a PDCCH scrambled with MsgB-RNTI to the terminal device through the resources in the Type1-PDCCH common search space (CSS) on the initial downlink BWP. The PDSCH scheduled by the PDCCH may include the random access response (also called MsgB) corresponding to the MsgA sent by the terminal device. If the network device only detects the MsgAPreamble and does not receive the MsgA PUSCH, the PDSCH scheduled by the PDCCH may include the fallback RAR corresponding to the MsgA Preamble sent by the terminal device. Accordingly, the terminal device uses the MsgB-RNTI to detect the PDCCH on the Type1-PDCCH CSS on the initial downlink BWP, and after detecting the PDCCH, determines whether it includes the success RAR (success RAR) or fallback RAR sent by the network device to itself according to the PDSCH scheduled by the PDCCH. If the terminal device correctly receives the success RAR, the terminal device feeds back an Acknowledgement (ACK) information to the network device, and the random access process of the terminal device is successful. Alternatively, if the terminal device receives a fallback RAR, the terminal device sends Msg3 on the uplink resource indicated by the fallback RAR after receiving the fallback RAR, and the two-step random access process falls back to the four-step random access process. Alternatively, if the terminal device does not receive any RAR, the random access process fails, and the terminal device needs to initiate the random access process again from the first step.

[0089] To facilitate a better understanding of the embodiments of the present application, the beam network deployment scenario under the NR-NTN related to the present application is described.

[0090] Beam layout in the NR-NTN scenario includes the following two cases:

[0091] Case 1: If Figure 3 As shown. One SSB corresponds to one terrestrial cell, or the beam width of SSB transmission is consistent with the beam width of data transmission. One terrestrial cell corresponds to one BWP for data transmission. After the terminal device accesses the network through the SSB on the initial BWP (i.e. BWP#0), the network device will configure the BWP corresponding to the SSB when the terminal device accesses the network for data transmission. In addition, as Figure 3 As shown, a Channel State Information Reference Signal (CSI-RS) can also be transmitted in downlink (DL) BWP#1 to DL BWP#3. The beamwidth and beam direction of the CSI-RS transmission are consistent with the beamwidth and beam direction of the data transmission. As an example, the beamwidth and beam direction of the CSI-RS on DL BWP#2 of cell #1 are the same as the beamwidth and beam direction of SSB#1 of cell #1.

[0092] Case 2: If Figure 4 As shown. One SSB corresponds to multiple terrestrial cells, or the beam width of SSB transmission is inconsistent with the beam width of data transmission, or the beam width of SSB transmission is larger than the beam width of data transmission. One terrestrial cell corresponds to one BWP for data transmission. After the terminal device accesses the network through the SSB on the initial BWP (i.e. BWP#0), the network device will configure the BWP corresponding to the SSB when the terminal device accesses the network for data transmission. In addition, as Figure 4 As shown, CSI-RS can also be transmitted in DL BWP#1 to DL BWP#3. The beamwidth and beam direction of CSI-RS transmission are consistent with the beamwidth and beam direction of data transmission. As an example, the beam of SSB#1 of cell#1 includes the beams of CSI-RS on DL BWP#1, DL BWP#2, and DL BWP#3 of cell#1. In some cases, this scenario can also be called an umbrella beam scenario.

[0093] In the NR-NTN system, the above two networking scenarios are currently supported. However, in the above networking scenarios, if the terminal device still continues to use the initial access process in the prior art, the terminal devices on multiple terrestrial cells will access the network through the same initial downlink BWP, which may cause the load on the initial downlink BWP to be too large, thereby increasing the access delay of the terminal device. In addition, if the terminal devices on multiple terrestrial cells all initiate random access through the same initial uplink BWP, it will also cause the PRACH collision on the initial uplink BWP to be more serious. This application mainly considers the enhancement of the initial access process in the NR-NTN system.

[0094] To address the above issues, this application proposes a random access solution that can avoid excessive load on the initial downlink BWP caused by terminal devices in multiple terrestrial cells accessing the network through the same initial downlink BWP, thereby avoiding increased access latency for terminal devices. Furthermore, it can support terminal devices in multiple terrestrial cells initiating random access through different initial uplink BWPs, thereby avoiding severe PRACH collisions on the initial uplink BWP.

[0095] The technical solution of this application is described in detail below through specific embodiments.

[0096] Figure 5 is a schematic flow chart of an initial access method 200 according to an embodiment of the present application, such as Figure 5 As shown, the method 200 may include at least part of the following contents:

[0097] S210, the terminal device performs initial access according to the first association relationship and / or the second association relationship, the first association relationship includes the association relationship between the initial downlink BWP and the uplink BWP, and the second association relationship includes the association relationship between the common search space set and the downlink BWP; wherein, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs; in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, or, the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP.

[0098] In some embodiments, the embodiments of the present application may be applied to an NTN network. Of course, the embodiments of the present application may also be applied to other networks, and the present application is not limited thereto.

[0099] In some embodiments, when the initial downlink BWP in the first association relationship is associated with the initial uplink BWP, multiple SSBs on the initial downlink BWP are associated with the same initial uplink BWP, and / or, multiple terrestrial cells corresponding to the multiple SSBs on the initial downlink BWP are associated with the same initial uplink BWP.

[0100] In some embodiments, a BWP includes all resource blocks (RBs) included in a carrier.

[0101] In some embodiments, a BWP includes a portion of RBs included in a carrier, where the portion of RBs is continuous in the frequency domain.

[0102] In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, wherein:

[0103] The RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP; and / or,

[0104] The RO and PO associated with the SSB on the initial downlink BWP are on the initial uplink BWP.

[0105] For example, Figure 6 As shown, SSB#0 on DL BWP#0 (initial downlink BWP) is associated with RO#0 on UL BWP#0 (initial uplink BWP), SSB#1 on DL BWP#0 (initial downlink BWP) is associated with RO#1 on UL BWP#0 (initial uplink BWP), and SSB#2 on DL BWP#0 (initial downlink BWP) is associated with RO#2 on UL BWP#0 (initial uplink BWP). That is, the initial downlink BWP is associated with the initial uplink BWP, wherein the RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP. In some embodiments, when at least two SSBs on the initial downlink BWP in the first association relationship are associated with different uplink BWPs, different SSBs on the initial downlink BWP are associated with different uplink BWPs, and / or multiple terrestrial cells corresponding to multiple SSBs on the initial downlink BWP are associated with different uplink BWPs.

[0106] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including:

[0107] The first SSB on the initial downlink BWP is associated with the first uplink BWP, wherein the RO associated with the first SSB is on the first uplink BWP, and / or the RO and PO associated with the first SSB are on the first uplink BWP;

[0108] The second SSB on the initial downlink BWP is associated with a second uplink BWP, wherein the RO associated with the second SSB is on the second uplink BWP, and / or the RO and PO associated with the second SSB are on the second uplink BWP.

[0109] In some embodiments, the first uplink BWP and the second uplink BWP are initial uplink BWPs corresponding to different terminal devices, for example, for UE1, its initial uplink BWP is the first uplink BWP; for UE2, its initial uplink BWP is the second uplink BWP.

[0110] For example, Figure 7 As shown, SSB#0 on DL BWP#0 (initial downlink BWP) is associated with RO#0 on UL BWP#1, SSB#1 on DL BWP#0 (initial downlink BWP) is associated with RO#1 on UL BWP#2, and SSB#2 on DL BWP#0 (initial downlink BWP) is associated with RO#2 on UL BWP#3. That is, different SSBs on the initial downlink BWP are associated with different uplink BWPs.

[0111] In some embodiments, the association relationship between the SSB and the RO is determined according to at least one of an SSB index, an RO resource, and an antenna polarization mode.

[0112] In some embodiments, the antenna polarization mode includes at least one of right-hand circular polarization (RHCP), left-hand circular polarization (LHCP), and linear polarization (LP). RHCP and LHCP may also be referred to as circular polarization.

[0113] In some embodiments, the SSB index is associated with the antenna polarization mode. The association may be predefined or determined based on at least one of a system message, RRC signaling, MAC CE, and DCI sent by the network device.

[0114] As an example, when the network device is configured with a circularly polarized antenna, the SSB corresponding to the even index is associated with the RHCP mode, and the SSB corresponding to the odd index is associated with the LHCP mode.

[0115] As an example, when the network device is configured with a linearly polarized antenna or is not configured with a circularly polarized antenna, all SSBs sent by the network device are associated with the LP mode.

[0116] In some embodiments, the RO resource is associated with the antenna polarization mode, and the association may be predefined or determined based on at least one of a system message, RRC signaling, MAC CE, and DCI sent by the network device.

[0117] As an example, a portion of RO resources is associated with the RHCP mode, another portion of RO resources is associated with the LHCP mode, and another portion of RO resources is associated with the LP mode.

[0118] As an example, when the network device is configured with a circularly polarized antenna, a portion of RO resources is associated with the RHCP mode, and another portion of RO resources is associated with the LHCP mode.

[0119] As an example, when the network device is configured with a linearly polarized antenna or is not configured with a circularly polarized antenna, all RO resources are associated with the LP mode.

[0120] In some embodiments, the SSB index, the RO resource, and the antenna polarization mode are associated with each other. The association may be predefined or determined based on at least one of a system message, RRC signaling, MAC CE, and DCI sent by the network device.

[0121] As an example, the SSB index is associated with the antenna polarization mode, and accordingly, the RO resource associated with the SSB index is also associated with the antenna polarization mode.

[0122] As an example, during the initial access process, the terminal device measures and evaluates the signal quality of the cell and the signal strength of each SSB in the cell. SSBs corresponding to odd-numbered indices are associated with the RHCP mode, and SSBs corresponding to even-numbered indices are associated with the LHCP mode. After detecting an SSB, for example, assuming that the terminal device detects SSB#1 whose SSB signal strength exceeds the threshold, the terminal device can determine that the antenna mode corresponding to the network device when transmitting SSB#1 is the RHCP mode.

[0123] As an example, before the terminal device initiates random access, the terminal device will measure and evaluate the signal quality of the cell and the signal strength of each SSB in the cell. When the SSB signal detection strength exceeds the threshold, the SSB with the strongest or stronger signal is determined. For example, after the terminal device determines that SSB#1 on the initial downlink BWP is the SSB with the strongest signal, the terminal device determines the PRACH transmission opportunity corresponding to SSB#1 according to the mapping relationship between SSB and RO in the first association relationship, including RO#1 and RO#1' on the initial uplink BWP, where RO#1 corresponds to the RHCP mode and RO#1' corresponds to the LHCP mode. Since the terminal device supports the LHCP mode, the terminal device can send PRACH to the network device through the resources in RO#1'.

[0124] In some embodiments, the antenna polarization mode is indicated by the network device to the terminal device. For example, the network device indicates to the terminal device the antenna polarization mode corresponding to SSB transmission, or the antenna polarization mode corresponding to physical signal or physical channel transmission on a DL BWP, or indicates to the terminal device the antenna polarization mode corresponding to physical signal or physical channel transmission on a UL BWP.

[0125] In some embodiments, the antenna polarization mode is reported by the terminal device to the network device. For example, the terminal device reports the antenna polarization mode supported by the terminal device to the network device.

[0126] In some embodiments, the first association relationship is predefined, or the first association relationship is determined based on first configuration information sent by the network device, wherein the first configuration information is transmitted through at least one of system messages, radio resource control (Radio Resource Control, RRC) signaling, media access control control element (Media Access Control Control Element, MAC CE) and downlink control information (Downlink Control Information, DCI).

[0127] In some embodiments, the first configuration information includes random access configuration information, wherein the random access configuration information includes uplink BWP information associated with the random access configuration and / or an SSB index associated with the random access configuration.

[0128] As an example, the random access configuration information includes configuration information of the uplink BWP associated with the random access configuration, wherein the configuration information of the uplink BWP includes at least one of the following: an identifier (ID) of the uplink BWP, a starting position of the uplink BWP, a frequency domain range corresponding to the uplink BWP (or the number of frequency domain RBs included in the uplink BWP), and a subcarrier spacing (SCS) or cyclic prefix (CP) type corresponding to the uplink BWP.

[0129] During the initial access phase, the terminal device has not yet established an RRC connection with the network device, and the terminal device has not been configured with a user-specific control channel. Instead, it needs to receive public control information within the cell through a common control channel on the initial downlink BWP to complete the subsequent initial access process. The terminal device receives the common control channel through the Common Search Space (CSS), which is configured through system messages or RRC signaling.

[0130] The public search spaces related to initial access mainly include the following:

[0131] Type0-PDCCH CSS: Type0-PDCCH is used to indicate the scheduling information of the PDSCH carrying the System Information Block (SIB) 1. Its search space is indicated by the PDCCH SIB1 configuration (pdcch-ConfigSIB1) information field in the Master Information Block (MIB) information, or configured through RRC signaling. The cyclic redundancy check (CRC) of its DCI format is scrambled by the System Information Radio Network Temporary Identity (SI-RNTI).

[0132] Type0A-PDCCH CSS: type0A-PDCCH is used to indicate the scheduling information of PDSCH carrying other system information (OSI). Its search space is configured through RRC signaling, and the CRC of its DCI format is scrambled by SI-RNTI.

[0133] Type1-PDCCH CSS: Type1-PDCCH is used to indicate the scheduling information of PDSCH carrying RAR. Its search space is configured through RRC signaling, and the CRC of its DCI format is scrambled by Random Access Radio Network Temporary Identity (RA-RNTI), Message B Radio Network Temporary Identity (MsgB Radio Network Temporary Identity, MsgB-RNTI), or Temporary Cell Radio Network Temporary Identity (TC-RNTI).

[0134] Type2-PDCCH CSS: Type2-PDCCH is used to indicate the scheduling information of the PDSCH carrying the paging message. Its search space is configured through RRC signaling, and the CRC of its DCI format is scrambled by the Paging Radio Network Temporary Identity (P-RNTI).

[0135] Through different CSSs, the terminal device can detect the PDCCH according to the control channel resource set of the PDCCH at the corresponding PDCCH monitoring opportunity.

[0136] In some embodiments, the common search space set includes but is not limited to at least one of the following:

[0137] Type0-PDCCH CSS set, Type0A-PDCCH CSS set, Type1-PDCCH CSS set, Type2-PDCCH CSS set.

[0138] In some embodiments, when the common search space set associated with the initial downlink BWP in the second association relationship is on the initial downlink BWP, the CSSs associated with the multiple SSBs on the initial downlink BWP are also on the initial downlink BWP. Figure 8 As shown in FIG, the CSSs associated with SSB#0, SSB#1, and SSB#2 on DL BWP#0 (initial downlink BWP) are the common search space set associated with DL BWP#0.

[0139] In some embodiments, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including:

[0140] The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein a common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

[0141] It should be noted that different downlink BWPs may refer to: different BWP identifiers (IDs), or different frequency domain resources corresponding to the BWPs, or different subcarrier spacings corresponding to the BWPs.

[0142] In some embodiments, when the common search space set of at least one SSB association on the initial downlink BWP in the second association relationship is not on the initial downlink BWP, the CSS of one SSB association on the initial downlink BWP is on the downlink BWP of the SSB association. Figure 9As shown, the CSS associated with SSB#0 on DL BWP#0 (initial downlink BWP) is on the DL BWP#1 associated with this SSB#0, the CSS associated with SSB#1 on DL BWP#0 (initial downlink BWP) is on the DL BWP#2 associated with this SSB#1, and the CSS associated with SSB#2 on DL BWP#0 (initial downlink BWP) is on the DL BWP#3 associated with this SSB#2. The CSSs associated with SSB#0, SSB#1, and SSB#2, respectively, are the common search space sets associated with this DL BWP#0.

[0143] In some embodiments, the second association relationship is predefined, or the second association relationship is determined based on second configuration information sent by the network device, wherein the second configuration information is transmitted through at least one of a system message, RRC signaling, MAC CE and DCI.

[0144] In some embodiments, the second configuration information includes PDCCH common configuration information, the PDCCH common configuration information includes downlink BWP information corresponding to the PDCCH common configuration, and / or, the SSB index corresponding to the PDCCH common configuration, wherein the PDCCH common configuration includes the configuration of the common search space set. In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and the above S210 may specifically include:

[0145] In the Type-1 random access process, the terminal device sends a first PRACH corresponding to message 1 (Msg1) through a first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is an SSB detected by the terminal device on the initial downlink BWP; or

[0146] In the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A (MsgA) through the first RO on the initial uplink BWP, and sends a first PUSCH corresponding to message A (MsgA) through the first PO on the initial uplink BWP, wherein the first RO is associated with a first SSB, the first PO is associated with the first RO, and the first SSB is the SSB detected by the terminal device on the initial downlink BWP; or,

[0147] During the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A (MsgA) through the first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is the SSB detected by the terminal device on the initial downlink BWP. In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: the first SSB on the initial downlink BWP is associated with the first uplink BWP, wherein the first SSB is the SSB detected by the terminal device on the initial downlink BWP; the above S210 may specifically include:

[0148] In the Type-1 random access process, the terminal device sends a first PRACH corresponding to message 1 (Msg1) through the first RO on the first uplink BWP; or,

[0149] In the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A (MsgA) through the first RO on the first uplink BWP, and sends a first PUSCH corresponding to message A (MsgA) through the first PO on the first uplink BWP, wherein the first PO is associated with the first RO; or,

[0150] In the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A (MsgA) through the first RO on the first uplink BWP.

[0151] In some embodiments, the first SSB on the initial downlink BWP is associated with the first uplink BWP, and the first RO on the first uplink BWP is associated with the first SSB on the initial downlink BWP.

[0152] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB detected by the terminal device on the initial downlink BWP; the above S210 may specifically include:

[0153] In the Type-1 random access process, the terminal device sends a first PUSCH corresponding to message 3 (Msg3) through the first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the uplink grant information in the RAR corresponding to message 2 (Msg2); or,

[0154] In the Type-2 random access process, the terminal device sends a first PUCCH corresponding to message B (MsgB) through the first physical uplink control channel (PUCCH) resource on the first uplink BWP, wherein the first PUCCH includes response information corresponding to the message B (MsgB); or,

[0155] During the Type-2 random access process, the terminal device sends the first PUSCH corresponding to message B (MsgB) through the first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the uplink authorization information in the fallback RAR corresponding to the message B (MsgB).

[0156] In some embodiments, in the first association relationship, the initial access downlink bandwidth, for example, the initial downlink BWP, is associated with the initial access uplink bandwidth, for example, the initial uplink BWP. The above S210 may specifically include:

[0157] The terminal device sends a PRACH via a PRACH resource on the initial access uplink bandwidth; and / or,

[0158] The terminal device sends the PUSCH corresponding to Msg3 through the PUSCH resources on the initial access uplink bandwidth; and / or,

[0159] The terminal device sends the PUSCH corresponding to MsgB through the PUSCH resources on the initial access uplink bandwidth; and / or,

[0160] The terminal device sends the PUCCH corresponding to MsgB through the PUCCH resources on the initial access uplink bandwidth.

[0161] In some embodiments, in the first association relationship, the synchronization signal on the initial access downlink bandwidth, for example, the first SSB on the initial downlink BWP, is associated with the first uplink bandwidth, for example, the first uplink BWP. The above S210 may specifically include:

[0162] The terminal device sends a PRACH through the PRACH resource on the first uplink bandwidth; and / or,

[0163] The terminal device sends the PUSCH corresponding to Msg3 through the PUSCH resource on the first uplink bandwidth; and / or,

[0164] The terminal device sends the PUSCH corresponding to MsgB through the PUSCH resources on the first uplink bandwidth; and / or,

[0165] The terminal device sends the PUCCH corresponding to MsgB through the PUCCH resources on the first uplink bandwidth.

[0166] In some embodiments, in the second association relationship, the initial access downlink bandwidth, for example, the public search space set associated with the initial downlink BWP, is on the initial access downlink bandwidth. The above S210 may specifically include:

[0167] The terminal device detects PDCCH candidates in the CSS set on the initial access downlink bandwidth.

[0168] In some embodiments, in the second association relationship, the initial access downlink bandwidth, for example, the common search space set associated with the initial downlink BWP, is on the first downlink bandwidth, wherein the initial access downlink bandwidth and the first downlink bandwidth are different (for example, at least one parameter corresponding to the initial access downlink bandwidth and the parameter corresponding to the first downlink bandwidth are different), and the above S210 may specifically include:

[0169] The terminal device detects PDCCH candidates in the CSS set on the first downlink bandwidth.

[0170] In some embodiments, in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, and the above S210 may specifically include at least one of the following situations:

[0171] The common search space set includes a Type0-PDCCH CSS set, and the terminal device uses the SI-RNTI to detect PDCCH candidates in the Type0-PDCCH CSS set on the initial downlink BWP;

[0172] The common search space set includes a Type0A-PDCCH CSS set, and the terminal device uses the SI-RNTI to detect PDCCH candidates in the Type0A-PDCCH CSS set on the initial downlink BWP;

[0173] The common search space set includes a Type1-PDCCH CSS set, and the terminal device uses the RA-RNTI, MsgB-RNTI, or TC-RNTI to detect PDCCH candidates in the Type1-PDCCH CSS set on the initial downlink BWP;

[0174] The common search space set includes a Type2-PDCCH CSS set, and the terminal device uses the P-RNTI to detect PDCCH candidates in the Type2-PDCCH CSS set on the initial downlink BWP.

[0175] In some embodiments, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: a common search space set associated with a first SSB on the initial downlink BWP is on a first downlink BWP, the first downlink BWP and the initial downlink BWP are different downlink BWPs, wherein the first SSB is an SSB detected by the terminal device on the initial downlink BWP; the above S210 may specifically include at least one of the following situations:

[0176] The common search space set includes a Type0-PDCCH CSS set, and the terminal device uses the SI-RNTI to detect PDCCH candidates in the Type0-PDCCH CSS set on the first downlink BWP;

[0177] The common search space set includes a Type0A-PDCCH CSS set, and the terminal device uses the SI-RNTI to detect PDCCH candidates in the Type0A-PDCCH CSS set on the first downlink BWP;

[0178] The common search space set includes a Type1-PDCCH CSS set, and the terminal device uses the RA-RNTI, MsgB-RNTI, or TC-RNTI to detect PDCCH candidates in the Type1-PDCCH CSS set on the first downlink BWP;

[0179] The common search space set includes a Type2-PDCCH CSS set, and the terminal device uses the P-RNTI to detect PDCCH candidates in the Type2-PDCCH CSS set on the first downlink BWP.

[0180] It should be noted that for PDCCH, the network device is sending PDCCH. For example, the network device sends SI-RNTI-scrambled PDCCH through resources in the Type0-PDCCH CSS set on the initial downlink BWP. For PDCCH, since the terminal device performs blind detection, it may or may not detect it. Therefore, the terminal device detects a PDCCH candidate. For example, the terminal device uses SI-RNTI to detect PDCCH candidates in the Type0-PDCCH CSS set on the first downlink BWP.

[0181] As embodiment 1, in a first association relationship, an initial downlink BWP is associated with an initial uplink BWP. Specifically, the RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP; and / or the RO and PO associated with the SSB on the initial downlink BWP are on the initial uplink BWP. In a second association relationship, the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP. This is described using a random access process as an example.

[0182] In embodiment 1, before the terminal device initiates random access, the terminal device measures and evaluates the signal quality of the cell and the signal strength of each SSB in the cell. When the SSB signal detection strength exceeds the threshold, the SSB with the strongest or stronger signal is determined. For example, after the terminal device determines that SSB#1 on the initial downlink BWP is the SSB with the strongest signal, the terminal device determines that the PRACH transmission opportunity corresponding to SSB#1 includes RO#1 on the initial uplink BWP based on the mapping relationship between SSB and RO in the first association relationship.

[0183] In embodiment 1, the four-step random access procedure (Type-1 random access procedure) may include the following steps:

[0184] In the first step, the terminal device sends a random access preamble sequence (Preamble, also called Msg1) to the network device on the PRACH resource corresponding to RO#1 on the initial uplink BWP.

[0185] In the second step, after detecting Msg1, the network device sends the RA-RNTI-scrambled PDCCH to the terminal device through the resources in the Type1-PDCCH CSS on the downlink BWP#2 (in the second association relationship, the downlink BWP associated with SSB#1). The PDSCH scheduled by the PDCCH may include the random access response (RAR, also called Msg2) corresponding to the Preamble sent by the terminal device. Accordingly, the terminal device uses RA-RNTI to detect PDCCH candidates on the Type1-PDCCH CSS on the downlink BWP#2, and after detecting the PDCCH, determines whether it includes the RAR sent by the network device to itself based on the PDSCH scheduled by the PDCCH. The RAR may include information such as the uplink authorization, timing advance command (TA command), TC-RNTI, etc. of message 3 (Mg3). Among them, the Type1-PDCCH CSS is configured by the network device through system messages and / or high-layer parameters.

[0186] In the third step, after receiving the RAR, the terminal device sends Msg3 on the uplink resource indicated by the RAR. The uplink resource can be located on the initial uplink BWP or on the uplink BWP associated with SSB#1. This step supports HARQ retransmission. If the network device does not correctly receive Msg3, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg3. The PDCCH can carry DCI format 0_0. The TC-RNTI scrambled PDCCH is transmitted via the Type 1-PDCCH CSS on downlink BWP#2.

[0187] In the fourth step, the network device sends message 4 (Msg4) to the terminal device through the resources in the Type1-PDCCH CSS on the downlink BWP#2, which includes a contention resolution message. This step supports HARQ retransmission. If the terminal device does not correctly receive Msg4, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg4. Among them, the PDCCH can carry DCI format 1_0. The TC-RNTI scrambled PDCCH is transmitted through the Type1-PDCCH CSS on the downlink BWP#2. If the terminal device correctly receives Msg4 and determines that the Msg4 is the message of the terminal device, the random access process of the terminal device is successful, otherwise the random access process fails. The terminal device needs to initiate the four-step random access process (Type-1 random access process) again from the first step.

[0188] In embodiment 1, the two-step random access procedure (Type-2 random access procedure) may include the following steps:

[0189] In the first step, the terminal device sends a message A (MsgA) to the network device on the RO corresponding to RO#1 on the initial uplink BWP and its associated PO, wherein MsgA includes MsgA Preamble and MsgA PUSCH.

[0190] In the second step, after detecting MsgA, the network device sends a PDCCH scrambled with MsgB-RNTI to the terminal device through the resources in the Type1-PDCCH CSS on the downlink BWP#2. The PDSCH scheduled by the PDCCH may include the random access response (also called MsgB) corresponding to the MsgA sent by the terminal device. If the network device only detects the MsgA Preamble and does not receive the MsgA PUSCH, the PDSCH scheduled by the PDCCH may include the fallback RAR corresponding to the MsgA Preamble sent by the terminal device. Accordingly, the terminal device uses the MsgB-RNTI to detect the PDCCH on the Type1-PDCCH CSS on the downlink BWP#2, and after detecting the PDCCH, determines whether it includes the success RAR (successRAR) or fallback RAR sent by the network device to itself based on the PDSCH scheduled by the PDCCH. If the terminal device correctly receives the successful RAR, the terminal device feeds back ACK information to the network device, wherein the ACK information can be transmitted through the initial uplink BWP or through the uplink BWP associated with the SSB#1, and the random access process of the terminal device is successful. Or if the terminal device receives a fallback RAR, the terminal device sends Msg3 on the uplink resource indicated by the fallback RAR after receiving the fallback RAR, wherein the uplink resource can be located on the initial uplink BWP or on the uplink BWP associated with the SSB#1, and the two-step random access process (Type-2 random access process) falls back to the four-step random access process (Type-1 random access process). Or if the terminal device does not receive any RAR, the random access process fails, and the terminal device needs to initiate the two-step random access process (Type-2 random access process) from the first step again.

[0191] As embodiment 2, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs; in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP. This is described using a random access process as an example.

[0192] In embodiment 2, before the terminal device initiates random access, the terminal device measures and evaluates the signal quality of the cell and the signal strength of each SSB in the cell. When the SSB signal detection strength exceeds the threshold, the SSB with the strongest or stronger signal is determined. For example, after the terminal device determines that SSB#1 on the initial downlink BWP is the SSB with the strongest signal, the terminal device determines that the PRACH transmission opportunity corresponding to SSB#1 includes RO#1 on the uplink BWP associated with SSB#1 (for example, the initial uplink BWP associated with SSB#1) based on the mapping relationship between SSB and RO in the first association relationship.

[0193] In embodiment 2, the four-step random access procedure (Type-1 random access procedure) may include the following steps:

[0194] In the first step, the terminal device sends a random access preamble sequence (Preamble, also called Msg1) to the network device on the PRACH resource corresponding to RO#1 on the uplink BWP associated with SSB#1.

[0195] In the second step, after detecting Msg1, the network device sends the RA-RNTI-scrambled PDCCH to the terminal device through the resources in the Type1-PDCCH CSS on the initial downlink BWP (in the second association relationship, the downlink BWP associated with SSB#1). The PDSCH scheduled by the PDCCH may include the random access response (RAR, also called Msg2) corresponding to the Preamble sent by the terminal device. Accordingly, the terminal device uses RA-RNTI to detect PDCCH candidates on the Type1-PDCCH CSS on the initial downlink BWP, and after detecting the PDCCH, determines whether it includes the RAR sent by the network device to itself based on the PDSCH scheduled by the PDCCH. The RAR may include information such as the uplink authorization of message 3 (Msg3), the timing advance command (TA command), and the temporary RNTI (TC-RNTI). Among them, the Type1-PDCCH CSS is configured by the network device through system messages and / or high-layer parameters.

[0196] In the third step, after receiving the RAR, the terminal device sends Msg3 on the uplink resource indicated by the RAR. The uplink resource can be located on the uplink BWP associated with SSB#1. This step supports HARQ retransmission. If the network device does not correctly receive Msg3, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg3. The PDCCH can carry DCI format 0_0. The TC-RNTI scrambled PDCCH is transmitted via the Type 1-PDCCH CSS on the initial downlink BWP.

[0197] In the fourth step, the network device sends message 4 (Msg4) to the terminal device through the resources in the Type1-PDCCH CSS on the initial downlink BWP, which includes a contention resolution message. This step supports HARQ retransmission. If the terminal device does not correctly receive Msg4, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg4. Among them, the PDCCH can carry DCI format 1_0. The TC-RNTI scrambled PDCCH is transmitted through the Type1-PDCCH CSS on the initial downlink BWP. If the terminal device correctly receives Msg4 and determines that the Msg4 is the message of the terminal device, the random access process of the terminal device is successful, otherwise the random access process fails. The terminal device needs to initiate the four-step random access process (Type-1 random access process) again from the first step.

[0198] In embodiment 2, the two-step random access procedure (Type-2 random access procedure) may include the following steps:

[0199] In the first step, the terminal device sends message A (MsgA) to the network device on the RO corresponding to RO#1 on the uplink BWP associated with SSB#1 and its associated PO, where MsgA includes MsgA Preamble and MsgA PUSCH.

[0200] In the second step, after detecting MsgA, the network device sends a PDCCH scrambled with MsgB-RNTI to the terminal device through the resources in the Type1-PDCCH common search space (CSS) on the initial downlink BWP. The PDSCH scheduled by the PDCCH may include the random access response (also called MsgB) corresponding to the MsgA sent by the terminal device. If the network device only detects the MsgAPreamble and does not receive the MsgA PUSCH, the PDSCH scheduled by the PDCCH may include the fallback RAR corresponding to the MsgA Preamble sent by the terminal device. Accordingly, the terminal device uses the MsgB-RNTI to detect the PDCCH on the Type1-PDCCH CSS on the initial downlink BWP, and after detecting the PDCCH, determines whether it includes the success RAR (success RAR) or fallback RAR sent by the network device to itself according to the PDSCH scheduled by the PDCCH. If the terminal device correctly receives the successful RAR, the terminal device feeds back ACK information to the network device, wherein the ACK information can be transmitted through the uplink BWP associated with the SSB#1, and the random access process of the terminal device is successful. Or if the terminal device receives a fallback RAR, the terminal device sends Msg3 on the uplink resource indicated by the fallback RAR after receiving the fallback RAR, wherein the uplink resource can be located on the uplink BWP associated with the SSB#1, and the two-step random access process (Type-2 random access process) falls back to the four-step random access process (Type-1 random access process). Or if the terminal device does not receive any RAR, the random access process fails, and the terminal device needs to initiate the two-step random access process (Type-2 random access process) from the first step again.

[0201] As embodiment 3, in a first association relationship, at least two SSBs on an initial downlink BWP are associated with different uplink BWPs; in a second association relationship, at least one SSB on an initial downlink BWP is associated with a common search space set that is not on the initial downlink BWP. This is described using a random access process as an example.

[0202] In embodiment 3, before the terminal device initiates random access, the terminal device measures and evaluates the signal quality of the cell and the signal strength of each SSB in the cell. When the SSB signal detection strength exceeds the threshold, the SSB with the strongest or stronger signal is determined. For example, after the terminal device determines that SSB#1 on the initial downlink BWP is the SSB with the strongest signal, the terminal device determines that the PRACH transmission opportunity corresponding to SSB#1 includes RO#1 on the uplink BWP associated with SSB#1 (for example, the initial uplink BWP associated with SSB#1) based on the mapping relationship between SSB and RO in the first association relationship.

[0203] In embodiment 3, the four-step random access procedure (Type-1 random access procedure) may include the following steps:

[0204] In the first step, the terminal device sends a random access preamble sequence (Preamble, also called Msg1) to the network device on the PRACH resource corresponding to RO#1 on the uplink BWP associated with SSB#1.

[0205] In the second step, after detecting Msg1, the network device sends a RA-RNTI-scrambled PDCCH to the terminal device through the resources in the Type1-PDCCH common search space (CSS) on the downlink BWP#2 (in the second association relationship, the downlink BWP associated with SSB#1). The PDSCH scheduled by the PDCCH may include the random access response (RAR, also called Msg2) corresponding to the Preamble sent by the terminal device. Accordingly, the terminal device uses RA-RNTI to detect PDCCH candidates on the Type1-PDCCH CSS on the downlink BWP#2, and after detecting the PDCCH, determines whether it includes the RAR sent by the network device to itself based on the PDSCH scheduled by the PDCCH. The RAR may include information such as the uplink authorization of message 3 (Msg3), the timing advance command (TA command), and the temporary RNTI (TC-RNTI). Among them, the Type1-PDCCH CSS is configured by the network device through system messages and / or high-layer parameters.

[0206] In the third step, after receiving the RAR, the terminal device sends Msg3 on the uplink resource indicated by the RAR. The uplink resource can be located on the uplink BWP associated with SSB#1. This step supports HARQ retransmission. If the network device does not correctly receive Msg3, it can use the TC-RNTI-scrambled PDCCH to schedule the retransmission of Msg3. The PDCCH can carry DCI format 0_0. The TC-RNTI-scrambled PDCCH is transmitted via the Type 1-PDCCH CSS on downlink BWP#2.

[0207] In the fourth step, the network device sends message 4 (Msg4) to the terminal device through the resources in the Type1-PDCCH CSS on the downlink BWP#2, which includes a contention resolution message. This step supports HARQ retransmission. If the terminal device does not correctly receive Msg4, the network device can use the TC-RNTI scrambled PDCCH to schedule the retransmission of Msg4. Among them, the PDCCH can carry DCI format 1_0. The TC-RNTI scrambled PDCCH is transmitted through the Type1-PDCCH CSS on the downlink BWP#2. If the terminal device correctly receives Msg4 and determines that the Msg4 is the message of the terminal device, the random access process of the terminal device is successful, otherwise the random access process fails. The terminal device needs to initiate the four-step random access process (Type-1 random access process) again from the first step.

[0208] In embodiment 3, the two-step random access procedure (Type-2 random access procedure) may include the following steps:

[0209] In the first step, the terminal device sends message A (MsgA) to the network device on the RO corresponding to RO#1 on the uplink BWP associated with SSB#1 and its associated PO, where MsgA includes MsgA Preamble and MsgA PUSCH.

[0210] In the second step, after detecting MsgA, the network device sends a PDCCH scrambled with MsgB-RNTI to the terminal device through the resources in the Type1-PDCCH common search space (CSS) on the downlink BWP#2. The PDSCH scheduled by the PDCCH may include the random access response (also called MsgB) corresponding to the MsgA sent by the terminal device. If the network device only detects the MsgAPreamble and does not receive the MsgA PUSCH, the PDSCH scheduled by the PDCCH may include the fallback RAR corresponding to the MsgA Preamble sent by the terminal device. Accordingly, the terminal device uses the MsgB-RNTI to detect the PDCCH on the Type1-PDCCH CSS on the downlink BWP#2, and after detecting the PDCCH, determines whether it includes the success RAR (success RAR) or fallback RAR sent by the network device to itself according to the PDSCH scheduled by the PDCCH. If the terminal device correctly receives the successful RAR, the terminal device feeds back ACK information to the network device, wherein the ACK information can be transmitted through the uplink BWP associated with the SSB#1, and the random access process of the terminal device is successful. Or if the terminal device receives a fallback RAR, the terminal device sends Msg3 on the uplink resource indicated by the fallback RAR after receiving the fallback RAR, wherein the uplink resource can be located on the uplink BWP associated with the SSB#1, and the two-step random access process (Type-2 random access process) falls back to the four-step random access process (Type-1 random access process). Or if the terminal device does not receive any RAR, the random access process fails, and the terminal device needs to initiate the two-step random access process (Type-2 random access process) from the first step again.

[0211] Therefore, in an embodiment of the present application, a terminal device can perform initial access based on the first association relationship and / or the second association relationship, thereby avoiding excessive load on the initial downlink BWP caused by terminal devices in multiple terrestrial cells accessing the network through the same initial downlink BWP, thereby avoiding increasing the access delay of the terminal device. In addition, terminal devices in multiple terrestrial cells can be supported to initiate random access through different initial uplink BWPs, thereby avoiding severe PRACH collisions on the initial uplink BWP.

[0212] Combined with the above Figures 5 to 9 , describes in detail the terminal side embodiment of the present application, and the following is combined with Figure 10 , the network side embodiment of the present application is described in detail. It should be understood that the network side embodiment and the terminal side embodiment correspond to each other, and similar descriptions can refer to the terminal side embodiment.

[0213] Figure 10is a schematic flow chart of an initial access method 300 according to an embodiment of the present application, such as Figure 10 As shown, the method 300 may include at least part of the following contents:

[0214] S310, the network device sends first information to the terminal device, where the first information is used to determine a first association relationship and / or a second association relationship for the initial access of the terminal device, where the first association relationship includes an association relationship between an initial downlink BWP and an uplink BWP, and the second association relationship includes an association relationship between a common search space set and a downlink BWP; wherein, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs; in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, or, the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP.

[0215] In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, wherein:

[0216] The RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP; and / or,

[0217] The RO and PO associated with the SSB on the initial downlink BWP are on the initial uplink BWP.

[0218] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including:

[0219] The first SSB on the initial downlink BWP is associated with the first uplink BWP, wherein the RO associated with the first SSB is on the first uplink BWP, and / or the RO and PO associated with the first SSB are on the first uplink BWP;

[0220] The second SSB on the initial downlink BWP is associated with a second uplink BWP, wherein the RO associated with the second SSB is on the second uplink BWP, and / or the RO and PO associated with the second SSB are on the second uplink BWP.

[0221] In some embodiments, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including:

[0222] The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein a common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

[0223] In some embodiments, the common search space set includes at least one of the following:

[0224] Type0-PDCCH CSS set, Type0A-PDCCH CSS set, Type1-PDCCH CSS set, Type2-PDCCH CSS set.

[0225] In some embodiments, the first information is transmitted via at least one of a system message, RRC signaling, MAC CE, and DCI.

[0226] In some embodiments, the first information includes first configuration information, and the first association relationship is determined based on the first configuration information.

[0227] In some embodiments, the first configuration information includes random access configuration information, wherein the random access configuration information includes uplink BWP information associated with the random access configuration and / or an SSB index associated with the random access configuration.

[0228] In some embodiments, the first information includes second configuration information, and the second association relationship is determined based on the second configuration information.

[0229] In some embodiments, the second configuration information includes PDCCH public configuration information, the PDCCH public configuration information includes downlink BWP information corresponding to the PDCCH public configuration, and / or, the SSB index corresponding to the PDCCH public configuration, wherein the PDCCH public configuration includes the configuration of the public search space set.

[0230] In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and the network device may perform at least one of the following:

[0231] In the Type-1 random access process, the network device detects a first PRACH corresponding to message 1 (Msg1) through a first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is an SSB sent by the network device on the initial downlink BWP;

[0232] In the Type-2 random access process, the network device detects the first PRACH corresponding to the message A (MsgA) through the first RO on the initial uplink BWP, and detects the first PUSCH corresponding to the message A (MsgA) through the first PO on the initial uplink BWP, wherein the first RO is associated with the first SSB, the first PO is associated with the first RO, and the first SSB is the SSB sent by the network device on the initial downlink BWP;

[0233] During the Type-2 random access process, the network device detects the first PRACH corresponding to message A (MsgA) through the first RO on the initial uplink BWP, wherein the first RO is associated with the first SSB, which is the SSB sent by the network device on the initial downlink BWP.

[0234] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB sent by the network device on the initial downlink BWP; the network device may perform at least one of the following:

[0235] In the Type-1 random access process, the network device detects the first PRACH corresponding to the message 1 (Msg1) through the first RO on the first uplink BWP;

[0236] In the Type-2 random access process, the network device detects a first PRACH corresponding to message A through a first RO on the first uplink BWP, and detects a first PUSCH corresponding to message A (MsgA) through a first PO on the first uplink BWP, wherein the first PO is associated with the first RO;

[0237] In the Type-2 random access process, the network device detects a first PRACH corresponding to a message A (MsgA) through a first RO on the first uplink BWP.

[0238] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB sent by the network device on the initial downlink BWP; the network device may perform at least one of the following:

[0239] In the Type-1 random access process, the network device receives a first PUSCH corresponding to message 3 (Msg3) through a first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the network device through uplink grant information in the RAR corresponding to message 2 (Msg2);

[0240] In the Type-2 random access process, the network device receives a first PUCCH corresponding to message B (MsgB) through a first physical uplink control channel PUCCH resource on the first uplink BWP, wherein the first PUCCH resource is indicated by the network device through the RAR corresponding to the message B (MsgB);

[0241] During the Type-2 random access process, the network device receives the first PUSCH corresponding to message B (MsgB) through the first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the network device through the uplink authorization information in the fallback RAR corresponding to the message B (MsgB).

[0242] In some embodiments, in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, and the network device may perform at least one of the following situations:

[0243] The common search space set includes a Type0-PDCCH CSS set, and the network device sends the SI-RNTI scrambled PDCCH through resources in the Type0-PDCCH CSS set on the initial downlink BWP;

[0244] The common search space set includes a Type0A-PDCCH CSS set, and the network device sends the SI-RNTI scrambled PDCCH through resources in the Type0A-PDCCH CSS set on the initial downlink BWP;

[0245] The common search space set includes a Type1-PDCCH CSS set, and the network device sends a PDCCH scrambled by RA-RNTI, MsgB-RNTI, or TC-RNTI through resources in the Type1-PDCCH CSS set on the initial downlink BWP;

[0246] The common search space set includes a Type2-PDCCH CSS set, and the network device sends a PDCCH scrambled by the P-RNTI through resources in the Type2-PDCCH CSS set on the initial downlink BWP.

[0247] In some embodiments, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: a common search space set associated with a first SSB on the initial downlink BWP is on a first downlink BWP, the first downlink BWP and the initial downlink BWP are different downlink BWPs, wherein the first SSB is an SSB sent by the network device on the initial downlink BWP; the network device may perform at least one of the following situations:

[0248] The common search space set includes a Type0-PDCCH CSS set, and the network device sends the SI-RNTI scrambled PDCCH through resources in the Type0-PDCCH CSS set on the first downlink BWP;

[0249] The common search space set includes a Type0A-PDCCH CSS set, and the network device sends the SI-RNTI scrambled PDCCH through resources in the Type0A-PDCCH CSS set on the first downlink BWP;

[0250] The common search space set includes a Type1-PDCCH CSS set, and the network device sends a PDCCH scrambled by RA-RNTI, MsgB-RNTI, or TC-RNTI through resources in the Type1-PDCCH CSS set on the first downlink BWP;

[0251] The common search space set includes a Type2-PDCCH CSS set, and the network device sends a PDCCH scrambled by the P-RNTI through resources in the Type2-PDCCH CSS set on the first downlink BWP.

[0252] Therefore, in an embodiment of the present application, the network device can indicate the first association relationship and / or the second association relationship to the terminal device, and the terminal device can perform initial access based on the first association relationship and / or the second association relationship, thereby avoiding excessive load on the initial downlink BWP caused by terminal devices in multiple terrestrial cells accessing the network through the same initial downlink BWP, thereby avoiding increasing the access delay of the terminal device. In addition, terminal devices in multiple terrestrial cells can be supported to initiate random access through different initial uplink BWPs, thereby avoiding severe PRACH collisions on the initial uplink BWP.

[0253] Combined with the above Figures 5 to 10 , describes the method embodiment of the present application in detail, and the following is combined with Figures 11 to 15 , the device embodiments of the present application are described in detail. It should be understood that the device embodiments and the method embodiments correspond to each other, and similar descriptions can refer to the method embodiments.

[0254] Figure 11 FIG. 4 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application. Figure 11 As shown, the terminal device 400 includes:

[0255] The processing unit 410 is configured to perform initial access according to the first association relationship and / or the second association relationship, wherein the first association relationship includes the association relationship between the initial downlink bandwidth part BWP and the uplink BWP, and the second association relationship includes the association relationship between the common search space set and the downlink BWP; wherein,

[0256] In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two synchronization signal blocks SSB on the initial downlink BWP are associated with different uplink BWPs;

[0257] In the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, or the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP.

[0258] In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, wherein:

[0259] The random access transmission opportunity RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP; and / or,

[0260] The RO and the physical uplink shared channel transmission opportunity PO associated with the SSB on the initial downlink BWP are on the initial uplink BWP.

[0261] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including:

[0262] The first SSB on the initial downlink BWP is associated with the first uplink BWP, wherein the RO associated with the first SSB is on the first uplink BWP, and / or the RO and PO associated with the first SSB are on the first uplink BWP;

[0263] The second SSB on the initial downlink BWP is associated with a second uplink BWP, wherein the RO associated with the second SSB is on the second uplink BWP, and / or the RO and PO associated with the second SSB are on the second uplink BWP.

[0264] In some embodiments, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including:

[0265] The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein a common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

[0266] In some embodiments, the common search space set includes at least one of the following:

[0267] Type 0 physical downlink control channel common search space Type0-PDCCH CSS set, Type0A-PDCCH CSS set, Type1-PDCCH CSS set, Type2-PDCCH CSS set.

[0268] In some embodiments, the first association relationship is predefined, or the first association relationship is determined based on first configuration information sent by the network device, wherein the first configuration information is transmitted through at least one of system messages, radio resource control RRC signaling, media access control element MAC CE and downlink control information DCI.

[0269] In some embodiments, the first configuration information includes random access configuration information, wherein the random access configuration information includes uplink BWP information associated with the random access configuration and / or an SSB index associated with the random access configuration.

[0270] In some embodiments, the second association relationship is predefined, or the second association relationship is determined based on second configuration information sent by the network device, wherein the second configuration information is transmitted through at least one of a system message, RRC signaling, MAC CE and DCI.

[0271] In some embodiments, the second configuration information includes PDCCH public configuration information, the PDCCH public configuration information includes downlink BWP information corresponding to the PDCCH public configuration, and / or, the SSB index corresponding to the PDCCH public configuration, wherein the PDCCH public configuration includes the configuration of the public search space set.

[0272] In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP.

[0273] The processing unit 410 is specifically configured to:

[0274] In a Type-1 random access procedure, a first physical random access channel PRACH corresponding to message 1 is sent through a first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is an SSB detected by the terminal device on the initial downlink BWP; or

[0275] In the Type-2 random access process, a first PRACH corresponding to message A is sent through a first RO on the initial uplink BWP, and a first PUSCH corresponding to message A is sent through a first PO on the initial uplink BWP, wherein the first RO is associated with a first SSB, the first PO is associated with the first RO, and the first SSB is the SSB detected by the terminal device on the initial downlink BWP; or

[0276] In the Type-2 random access process, the first PRACH corresponding to the message A is sent through the first RO on the initial uplink BWP, wherein the first RO is associated with the first SSB, and the first SSB is the SSB detected by the terminal device on the initial downlink BWP.

[0277] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB detected by the terminal device on the initial downlink BWP;

[0278] The processing unit 410 is specifically configured to:

[0279] In the Type-1 random access process, a first physical random access channel PRACH corresponding to message 1 is sent through the first RO on the first uplink BWP; or,

[0280] In the Type-2 random access process, a first PRACH corresponding to message A is sent through a first RO on the first uplink BWP, and a first PUSCH corresponding to message A is sent through a first PO on the first uplink BWP, wherein the first PO is associated with the first RO; or

[0281] In the Type-2 random access process, the first PRACH corresponding to the message A is sent through the first RO on the first uplink BWP.

[0282] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB detected by the terminal device on the initial downlink BWP;

[0283] The processing unit 410 is specifically configured to:

[0284] In a Type-1 random access procedure, sending a first PUSCH corresponding to message 3 through a first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by uplink grant information in a random access response RAR corresponding to message 2; or

[0285] In the Type-2 random access process, a first PUCCH corresponding to message B is sent through a first physical uplink control channel PUCCH resource on the first uplink BWP, wherein the first PUCCH includes response information corresponding to message B; or

[0286] In the Type-2 random access process, a first PUSCH corresponding to message B is sent through a first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by uplink grant information in a fallback RAR corresponding to message B.

[0287] In some embodiments, in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP,

[0288] The processing unit 410 performs initial access according to the first association relationship and / or the second association relationship, including at least one of the following situations:

[0289] The common search space set includes a Type0-PDCCH CSS set, and the processing unit 410 uses a system message-radio network temporary identifier SI-RNTI to detect PDCCH candidates in the Type0-PDCCH CSS set on the initial downlink BWP;

[0290] The common search space set includes a Type0A-PDCCH CSS set, and the processing unit 410 uses the SI-RNTI to detect PDCCH candidates in the Type0A-PDCCH CSS set on the initial downlink BWP;

[0291] The common search space set includes a Type1-PDCCH CSS set, and the processing unit 410 uses a random access-radio network temporary identifier RA-RNTI, a message B-radio network temporary identifier MsgB-RNTI, or a temporary cell-radio network temporary identifier TC-RNTI to detect PDCCH candidates in the Type1-PDCCH CSS set on the initial downlink BWP;

[0292] The common search space set includes a Type2-PDCCH CSS set, and the processing unit 410 uses a paging-radio network temporary identifier P-RNTI to detect PDCCH candidates in the Type2-PDCCH CSS set on the initial downlink BWP.

[0293] In some embodiments, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: a common search space set associated with a first SSB on the initial downlink BWP is on a first downlink BWP, the first downlink BWP and the initial downlink BWP are different downlink BWPs, wherein the first SSB is an SSB detected by the terminal device on the initial downlink BWP;

[0294] The processing unit 410 performs initial access according to the first association relationship and / or the second association relationship, including at least one of the following situations:

[0295] The common search space set includes a Type0-PDCCH CSS set, and the processing unit 410 uses the SI-RNTI to detect PDCCH candidates in the Type0-PDCCH CSS set on the first downlink BWP;

[0296] The common search space set includes a Type0A-PDCCH CSS set, and the processing unit 410 uses the SI-RNTI to detect PDCCH candidates in the Type0A-PDCCH CSS set on the first downlink BWP;

[0297] The common search space set includes a Type1-PDCCH CSS set, and the processing unit 410 uses RA-RNTI, MsgB-RNTI, or TC-RNTI to detect PDCCH candidates in the Type1-PDCCH CSS set on the first downlink BWP;

[0298] The common search space set includes a Type 2-PDCCH CSS set, and the processing unit 410 uses the P-RNTI to detect PDCCH candidates in the Type 2-PDCCH CSS set on the first downlink BWP.

[0299] In some embodiments, the processing unit may be one or more processors.

[0300] It should be understood that the terminal device 400 according to the embodiment of the present application may correspond to the terminal device in the embodiment of the method of the present application, and the above and other operations and / or functions of each unit in the terminal device 400 are respectively to achieve Figure 5For the sake of brevity, the corresponding processes of the terminal device in the method 200 are not repeated here.

[0301] Figure 12 FIG. 5 shows a schematic block diagram of a network device 500 according to an embodiment of the present application. Figure 12 As shown, the network device 500 includes:

[0302] The communication unit 510 is configured to send first information to the terminal device, where the first information is used to determine a first association relationship and / or a second association relationship for initial access of the terminal device, where the first association relationship includes an association relationship between an initial downlink bandwidth part BWP and an uplink BWP, and the second association relationship includes an association relationship between a common search space set and a downlink BWP; wherein,

[0303] In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two synchronization signal blocks SSB on the initial downlink BWP are associated with different uplink BWPs;

[0304] In the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP, or the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP.

[0305] In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, wherein:

[0306] The random access transmission opportunity RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP; and / or,

[0307] The RO and the physical uplink shared channel transmission opportunity PO associated with the SSB on the initial downlink BWP are on the initial uplink BWP.

[0308] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including:

[0309] The first SSB on the initial downlink BWP is associated with the first uplink BWP, wherein the RO associated with the first SSB is on the first uplink BWP, and / or the RO and PO associated with the first SSB are on the first uplink BWP;

[0310] The second SSB on the initial downlink BWP is associated with a second uplink BWP, wherein the RO associated with the second SSB is on the second uplink BWP, and / or the RO and PO associated with the second SSB are on the second uplink BWP.

[0311] In some embodiments, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including:

[0312] The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein a common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

[0313] In some embodiments, the common search space set includes at least one of the following:

[0314] Type 0 physical downlink control channel common search space Type0-PDCCH CSS set, Type0A-PDCCH CSS set, Type1-PDCCH CSS set, Type2-PDCCH CSS set.

[0315] In some embodiments, the first information is transmitted through at least one of a system message, a radio resource control RRC signaling, a media access control element MAC CE, and downlink control information DCI.

[0316] In some embodiments, the first information includes first configuration information, and the first association relationship is determined based on the first configuration information.

[0317] In some embodiments, the first configuration information includes random access configuration information, wherein the random access configuration information includes uplink BWP information associated with the random access configuration and / or an SSB index associated with the random access configuration.

[0318] In some embodiments, the first information includes second configuration information, and the second association relationship is determined based on the second configuration information.

[0319] In some embodiments, the second configuration information includes PDCCH public configuration information, the PDCCH public configuration information includes downlink BWP information corresponding to the PDCCH public configuration, and / or, the SSB index corresponding to the PDCCH public configuration, wherein the PDCCH public configuration includes the configuration of the public search space set.

[0320] In some embodiments, in the first association relationship, the initial downlink BWP is associated with the initial uplink BWP.

[0321] The network device further includes a processing unit 520, wherein the processing unit 520 is configured to perform at least one of the following:

[0322] In a Type-1 random access process, the processing unit 520 detects a first physical random access channel PRACH corresponding to message 1 through a first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is an SSB sent by the network device on the initial downlink BWP; or

[0323] In the Type-2 random access process, the processing unit 520 detects the first PRACH corresponding to the message A through the first RO on the initial uplink BWP, and detects the first PUSCH corresponding to the message A through the first PO on the initial uplink BWP, wherein the first RO is associated with the first SSB, the first PO is associated with the first RO, and the first SSB is the SSB sent by the network device on the initial downlink BWP; or,

[0324] During the Type-2 random access process, the processing unit 520 detects the first PRACH corresponding to the message A through the first RO on the initial uplink BWP, wherein the first RO is associated with the first SSB, which is the SSB sent by the network device on the initial downlink BWP.

[0325] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB sent by the network device on the initial downlink BWP;

[0326] The network device further includes a processing unit 520, wherein the processing unit 520 is configured to perform at least one of the following:

[0327] In the Type-1 random access process, the processing unit 520 detects the first physical random access channel PRACH corresponding to the message 1 through the first RO on the first uplink BWP;

[0328] In the Type-2 random access process, the processing unit 520 detects a first PRACH corresponding to the message A through a first RO on the first uplink BWP, and detects a first PUSCH corresponding to the message A through a first PO on the first uplink BWP, wherein the first PO is associated with the first RO;

[0329] In the Type-2 random access procedure, the processing unit 520 detects the first PRACH corresponding to the message A through the first RO on the first uplink BWP.

[0330] In some embodiments, in the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB sent by the network device on the initial downlink BWP;

[0331] The network device further includes a processing unit 520, wherein the processing unit 520 is configured to perform at least one of the following:

[0332] In the Type-1 random access process, the processing unit 520 receives the first PUSCH corresponding to message 3 through the first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the network device through the uplink grant information in the random access response RAR corresponding to message 2;

[0333] In the Type-2 random access process, the processing unit 520 receives a first PUCCH corresponding to message B through a first physical uplink control channel PUCCH resource on the first uplink BWP, wherein the first PUCCH resource is indicated by the network device through the RAR corresponding to the message B;

[0334] During the Type-2 random access process, the processing unit 520 receives the first PUSCH corresponding to message B through the first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the network device through the uplink authorization information in the fallback RAR corresponding to message B.

[0335] In some embodiments, in the second association relationship, the common search space set associated with the initial downlink BWP is on the initial downlink BWP,

[0336] The network device further includes a processing unit 520, wherein the processing unit 520 is configured to perform at least one of the following:

[0337] The common search space set includes a Type0-PDCCH CSS set, and the processing unit 520 sends a system message-radio network temporary identifier SI-RNTI scrambled PDCCH through resources in the Type0-PDCCH CSS set on the initial downlink BWP;

[0338] The common search space set includes a Type0A-PDCCH CSS set, and the processing unit 520 sends the SI-RNTI scrambled PDCCH through resources in the Type0A-PDCCH CSS set on the initial downlink BWP;

[0339] The common search space set includes a Type1-PDCCH CSS set, and the processing unit 520 sends a PDCCH scrambled by a random access-radio network temporary identifier RA-RNTI, a message B-radio network temporary identifier MsgB-RNTI, or a temporary cell-radio network temporary identifier TC-RNTI through resources in the Type1-PDCCH CSS set on the initial downlink BWP;

[0340] The common search space set includes a Type2-PDCCH CSS set, and the processing unit 520 sends a PDCCH scrambled by a paging-radio network temporary identifier P-RNTI through resources in the Type2-PDCCH CSS set on the initial downlink BWP.

[0341] In some embodiments, in the second association relationship, the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: the common search space set associated with the first SSB on the initial downlink BWP is on the first downlink BWP, the first downlink BWP and the initial downlink BWP are different downlink BWPs, wherein the first SSB is the SSB sent by the network device on the initial downlink BWP;

[0342] The network device further includes a processing unit 520, wherein the processing unit 520 is configured to perform at least one of the following:

[0343] The common search space set includes a Type0-PDCCH CSS set, and the processing unit 520 sends the SI-RNTI scrambled PDCCH through resources in the Type0-PDCCH CSS set on the first downlink BWP;

[0344] The common search space set includes a Type0A-PDCCH CSS set, and the processing unit 520 sends the SI-RNTI scrambled PDCCH through resources in the Type0A-PDCCH CSS set on the first downlink BWP;

[0345] The common search space set includes a Type1-PDCCH CSS set, and the processing unit 520 sends a PDCCH scrambled by RA-RNTI, MsgB-RNTI, or TC-RNTI through resources in the Type1-PDCCH CSS set on the first downlink BWP;

[0346] The common search space set includes a Type2-PDCCH CSS set, and the processing unit 520 sends the PDCCH scrambled by the P-RNTI through resources in the Type2-PDCCH CSS set on the first downlink BWP.

[0347] In some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip. The processing unit may be one or more processors.

[0348] It should be understood that the network device 500 according to the embodiment of the present application may correspond to the network device in the embodiment of the method of the present application, and the above and other operations and / or functions of each unit in the network device 500 are respectively to implement Figure 10 For the sake of brevity, the corresponding processes of the network device in the method 300 are not repeated here.

[0349] Figure 13 It is a schematic structural diagram of a communication device 600 provided in an embodiment of the present application. Figure 13 The communication device 600 shown includes a processor 610, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0350] In some embodiments, as Figure 13 As shown, the communication device 600 may further include a memory 620. The processor 610 may call and execute a computer program from the memory 620 to implement the method in the embodiment of the present application.

[0351] The memory 620 may be a separate device independent of the processor 610 , or may be integrated into the processor 610 .

[0352] In some embodiments, as Figure 13 As shown, the communication device 600 may further include a transceiver 630 , and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices.

[0353] The transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include an antenna, and the number of antennas may be one or more.

[0354] In some embodiments, the communication device 600 may specifically be a network device of an embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0355] In some embodiments, the communication device 600 may specifically be a terminal device of an embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0356] Figure 14 It is a schematic structural diagram of the device of an embodiment of the present application. Figure 14 The device 700 shown includes a processor 710, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0357] In some embodiments, as Figure 14 As shown, the apparatus 700 may further include a memory 720. The processor 710 may call and execute a computer program from the memory 720 to implement the method in the embodiment of the present application.

[0358] The memory 720 may be a separate device independent of the processor 710 , or may be integrated into the processor 710 .

[0359] In some embodiments, the apparatus 700 may further include an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0360] In some embodiments, the apparatus 700 may further include an output interface 740. The processor 710 may control the output interface 740 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0361] In some embodiments, the device can be applied to the network equipment in the embodiments of the present application, and the device can implement the corresponding processes implemented by the network equipment in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0362] In some embodiments, the apparatus can be applied to the terminal device in the embodiments of the present application, and the apparatus can implement the corresponding processes implemented by the terminal device in the various methods in the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0363] In some embodiments, the device mentioned in the embodiments of the present application may also be a chip, such as a system-on-chip, a system-on-chip, a chip system, or a system-on-chip chip.

[0364] Figure 15 800 is a schematic block diagram of a communication system 800 provided in an embodiment of the present application. Figure 15 As shown, the communication system 800 includes a terminal device 810 and a network device 820 .

[0365] Among them, the terminal device 810 can be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 820 can be used to implement the corresponding functions implemented by the network device in the above method. For the sake of brevity, they are not repeated here.

[0366] It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by hardware integrated logic circuits in the processor or software instructions. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly implemented as a hardware decoding processor, or can be implemented by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0367] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0368] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0369] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0370] In some embodiments, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0371] In some embodiments, the computer-readable storage medium can be applied to the terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0372] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0373] In some embodiments, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0374] In some embodiments, the computer program product can be applied to the terminal device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0375] The embodiment of the present application also provides a computer program.

[0376] In some embodiments, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0377] In some embodiments, the computer program can be applied to the terminal device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0378] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0379] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0380] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0381] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0382] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0383] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. In view of this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0384] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An initial access method, characterized in that: include: The terminal device performs initial access according to the first association relationship and / or the second association relationship, wherein the first association relationship includes the association relationship between the initial downlink bandwidth part BWP and the uplink BWP, and the second association relationship includes the association relationship between the common search space set and the downlink BWP; wherein, In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two synchronization signal blocks SSB on the initial downlink BWP are associated with different uplink BWPs; In the second association relationship, the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP; Among them, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein the common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

2. The method according to claim 1, wherein In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, wherein: The random access transmission opportunity RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP; and / or, The RO and the physical uplink shared channel transmission opportunity PO associated with the SSB on the initial downlink BWP are on the initial uplink BWP.

3. The method according to claim 1, wherein In the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: The first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the RO associated with the first SSB is on the first uplink BWP, and / or the RO and PO associated with the first SSB are on the first uplink BWP; The second SSB on the initial downlink BWP is associated with a second uplink BWP, wherein the RO associated with the second SSB is on the second uplink BWP, and / or the RO and PO associated with the second SSB are on the second uplink BWP.

4. The method according to claim 1, wherein The common search space set includes at least one of the following: Type 0 physical downlink control channel common search space Type0-PDCCH CSS set, Type0A-PDCCH CSS set, Type1-PDCCH CSS set, Type2-PDCCH CSS set.

5. The method according to any one of claims 1 to 4, characterized in that The first association relationship is predefined, or the first association relationship is determined based on first configuration information sent by the network device, wherein the first configuration information is transmitted through at least one of system messages, radio resource control RRC signaling, media access control element MAC CE and downlink control information DCI.

6. The method according to claim 5, wherein The first configuration information includes random access configuration information, wherein the random access configuration information includes uplink BWP information associated with the random access configuration and / or an SSB index associated with the random access configuration.

7. The method according to any one of claims 1 to 4, characterized in that The second association relationship is predefined, or the second association relationship is determined based on second configuration information sent by the network device, wherein the second configuration information is transmitted through at least one of a system message, RRC signaling, MAC CE and DCI.

8. The method according to claim 7, wherein The second configuration information includes PDCCH common configuration information, and the PDCCH common configuration information includes downlink BWP information corresponding to the PDCCH common configuration and / or the SSB index corresponding to the PDCCH common configuration, wherein the PDCCH common configuration includes the configuration of the common search space set.

9. The method according to any one of claims 1 to 4, characterized in that In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP. The terminal device performs initial access according to the first association relationship and / or the second association relationship, including: In a Type-1 random access procedure, the terminal device sends a first physical random access channel PRACH corresponding to message 1 through a first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is an SSB detected by the terminal device on the initial downlink BWP; or In the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A through the first RO on the initial uplink BWP, and sends a first PUSCH corresponding to message A through the first PO on the initial uplink BWP, wherein the first RO is associated with a first SSB, the first PO is associated with the first RO, and the first SSB is the SSB detected by the terminal device on the initial downlink BWP; or, During the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A through a first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is the SSB detected by the terminal device on the initial downlink BWP.

10. The method according to any one of claims 1 to 4, characterized in that In the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB detected by the terminal device on the initial downlink BWP; The terminal device performs initial access according to the first association relationship and / or the second association relationship, including: In the Type-1 random access process, the terminal device sends a first physical random access channel PRACH corresponding to message 1 through the first RO on the first uplink BWP; or, In the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A through a first RO on the first uplink BWP, and sends a first PUSCH corresponding to message A through a first PO on the first uplink BWP, wherein the first PO is associated with the first RO; or During the Type-2 random access process, the terminal device sends a first PRACH corresponding to message A through the first RO on the first uplink BWP.

11. The method according to any one of claims 1 to 4, characterized in that In the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB detected by the terminal device on the initial downlink BWP; The terminal device performs initial access according to the first association relationship and / or the second association relationship, including: In the Type-1 random access process, the terminal device sends a first PUSCH corresponding to message 3 through a first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the uplink grant information in the random access response RAR corresponding to message 2; or In the Type-2 random access process, the terminal device sends a first PUCCH corresponding to message B through the first physical uplink control channel PUCCH resource on the first uplink BWP, wherein the first PUCCH includes response information corresponding to the message B; or During the Type-2 random access process, the terminal device sends the first PUSCH corresponding to message B through the first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the uplink authorization information in the fallback RAR corresponding to the message B.

12. The method according to any one of claims 1 to 4, characterized in that In the second association relationship, the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: the common search space set associated with the first SSB on the initial downlink BWP is in the first downlink BWP, the first downlink BWP and the initial downlink BWP are different downlink BWPs, wherein the first SSB is the SSB detected by the terminal device on the initial downlink BWP; The terminal device performs initial access according to the first association relationship and / or the second association relationship, including at least one of the following situations: The common search space set includes a Type0-PDCCH CSS set, and the terminal device uses the SI-RNTI to detect PDCCH candidates in the Type0-PDCCH CSS set on the first downlink BWP; The common search space set includes a Type0A-PDCCH CSS set, and the terminal device uses the SI-RNTI to detect PDCCH candidates in the Type0A-PDCCH CSS set on the first downlink BWP; The common search space set includes a Type 1-PDCCH CSS set, and the terminal device uses RA-RNTI, MsgB-RNTI, or TC-RNTI to detect PDCCH candidates in the Type 1-PDCCH CSS set on the first downlink BWP; The common search space set includes a Type2-PDCCH CSS set, and the terminal device uses the P-RNTI to detect PDCCH candidates in the Type2-PDCCH CSS set on the first downlink BWP.

13. An initial access method, characterized in that: include: The network device sends first information to the terminal device, where the first information is used to determine a first association relationship and / or a second association relationship for the terminal device to perform initial access, where the first association relationship includes an association relationship between an initial downlink bandwidth part BWP and an uplink BWP, and the second association relationship includes an association relationship between a common search space set and a downlink BWP; wherein, In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two synchronization signal blocks SSB on the initial downlink BWP are associated with different uplink BWPs; In the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP; Among them, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein the common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

14. The method according to claim 13, wherein In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, wherein: The random access transmission opportunity RO associated with the SSB on the initial downlink BWP is on the initial uplink BWP; and / or, The RO and the physical uplink shared channel transmission opportunity PO associated with the SSB on the initial downlink BWP are on the initial uplink BWP.

15. The method according to claim 13, wherein In the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: The first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the RO associated with the first SSB is on the first uplink BWP, and / or the RO and PO associated with the first SSB are on the first uplink BWP; The second SSB on the initial downlink BWP is associated with a second uplink BWP, wherein the RO associated with the second SSB is on the second uplink BWP, and / or the RO and PO associated with the second SSB are on the second uplink BWP.

16. The method according to claim 13, wherein The common search space set includes at least one of the following: Type 0 physical downlink control channel common search space Type0-PDCCH CSS set, Type0A-PDCCH CSS set, Type1-PDCCH CSS set, Type2-PDCCH CSS set.

17. The method according to any one of claims 13 to 16, characterized in that The first information is transmitted through at least one of a system message, a radio resource control RRC signaling, a media access control element MAC CE, and downlink control information DCI.

18. The method according to any one of claims 13 to 16, characterized in that The first information includes first configuration information, and the first association relationship is determined based on the first configuration information.

19. The method according to claim 18, wherein The first configuration information includes random access configuration information, wherein the random access configuration information includes uplink BWP information associated with the random access configuration and / or an SSB index associated with the random access configuration.

20. The method according to any one of claims 13 to 16, characterized in that The first information includes second configuration information, and the second association relationship is determined based on the second configuration information.

21. The method according to claim 20, wherein The second configuration information includes PDCCH common configuration information, and the PDCCH common configuration information includes downlink BWP information corresponding to the PDCCH common configuration and / or the SSB index corresponding to the PDCCH common configuration, wherein the PDCCH common configuration includes the configuration of the common search space set.

22. The method according to any one of claims 13 to 16, characterized in that In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP. The method further includes at least one of the following: In a Type-1 random access procedure, the network device detects a first physical random access channel PRACH corresponding to message 1 through a first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is an SSB sent by the network device on the initial downlink BWP; In the Type-2 random access process, the network device detects the first PRACH corresponding to the message A through the first RO on the initial uplink BWP, and detects the first PUSCH corresponding to the message A through the first PO on the initial uplink BWP, wherein the first RO is associated with a first SSB, the first PO is associated with the first RO, and the first SSB is the SSB sent by the network device on the initial downlink BWP; In the Type-2 random access process, the network device detects the first PRACH corresponding to the message A through the first RO on the initial uplink BWP, wherein the first RO is associated with a first SSB, and the first SSB is the SSB sent by the network device on the initial downlink BWP.

23. The method according to any one of claims 13 to 16, characterized in that In the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB sent by the network device on the initial downlink BWP; The method further includes at least one of the following: In the Type-1 random access process, the network device detects a first physical random access channel PRACH corresponding to message 1 through the first RO on the first uplink BWP; In the Type-2 random access process, the network device detects a first PRACH corresponding to the message A through a first RO on the first uplink BWP, and detects a first PUSCH corresponding to the message A through a first PO on the first uplink BWP, wherein the first PO is associated with the first RO; In the Type-2 random access process, the network device detects a first PRACH corresponding to the message A through a first RO on the first uplink BWP.

24. The method according to any one of claims 13 to 16, wherein In the first association relationship, at least two SSBs on the initial downlink BWP are associated with different uplink BWPs, including: a first SSB on the initial downlink BWP is associated with a first uplink BWP, wherein the first SSB is an SSB sent by the network device on the initial downlink BWP; The method further includes at least one of the following: In the Type-1 random access process, the network device receives a first PUSCH corresponding to message 3 through a first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the uplink grant information in the random access response RAR corresponding to message 2 by the network device; or In the Type-2 random access process, the network device receives a first PUCCH corresponding to message B through a first physical uplink control channel PUCCH resource on the first uplink BWP, wherein the first PUCCH resource is indicated by the network device through the RAR corresponding to the message B; or During the Type-2 random access process, the network device receives the first PUSCH corresponding to message B through the first PUSCH resource on the first uplink BWP, wherein the first PUSCH resource is indicated by the network device through the uplink authorization information in the fallback RAR corresponding to the message B.

25. The method according to any one of claims 13 to 16, characterized in that In the second association relationship, the common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: the common search space set associated with the first SSB on the initial downlink BWP is in the first downlink BWP, the first downlink BWP and the initial downlink BWP are different downlink BWPs, wherein the first SSB is the SSB sent by the network device on the initial downlink BWP; The method further includes at least one of the following: The common search space set includes a Type0-PDCCH CSS set, and the network device sends the SI-RNTI scrambled PDCCH through resources in the Type0-PDCCH CSS set on the first downlink BWP; The common search space set includes a Type0A-PDCCH CSS set, and the network device sends the SI-RNTI scrambled PDCCH through resources in the Type0A-PDCCH CSS set on the first downlink BWP; The common search space set includes a Type1-PDCCH CSS set, and the network device sends a PDCCH scrambled by RA-RNTI, MsgB-RNTI, or TC-RNTI through resources in the Type1-PDCCH CSS set on the first downlink BWP; The common search space set includes a Type2-PDCCH CSS set, and the network device sends a PDCCH scrambled by the P-RNTI through resources in the Type2-PDCCH CSS set on the first downlink BWP.

26. A terminal device, characterized in that: include: A processing unit, configured to perform initial access according to a first association relationship and / or a second association relationship, wherein the first association relationship includes an association relationship between an initial downlink bandwidth part BWP and an uplink BWP, and the second association relationship includes an association relationship between a common search space set and a downlink BWP; wherein, In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two synchronization signal blocks SSB on the initial downlink BWP are associated with different uplink BWPs; In the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP; Among them, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein the common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

27. A network device, characterized in that: include: A communication unit, configured to send first information to a terminal device, where the first information is used to determine a first association relationship and / or a second association relationship for initial access of the terminal device, where the first association relationship includes an association relationship between an initial downlink bandwidth part BWP and an uplink BWP, and the second association relationship includes an association relationship between a common search space set and a downlink BWP; wherein, In the first association relationship, the initial downlink BWP is associated with the initial uplink BWP, and / or at least two synchronization signal blocks SSB on the initial downlink BWP are associated with different uplink BWPs; In the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP; Among them, in the second association relationship, a common search space set associated with at least one SSB on the initial downlink BWP is not on the initial downlink BWP, including: The first SSB on the initial downlink BWP is associated with a first downlink BWP, wherein the common search space set associated with the first SSB is on the first downlink BWP, and the first downlink BWP and the initial downlink BWP are different downlink BWPs.

28. A terminal device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 12.

29. A network device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method according to any one of claims 13 to 25.

30. A chip, characterized in that: The device comprises: a processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes the method according to any one of claims 1 to 12.

31. A chip, characterized in that: include: A processor, configured to call and execute a computer program from a memory, so that a device equipped with the chip executes the method according to any one of claims 13 to 25.

32. A computer-readable storage medium, characterized in that Used to store a computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 12.

33. A computer-readable storage medium, characterized in that Used to store a computer program, the computer program causing a computer to execute the method according to any one of claims 13 to 25.

34. A computer program product, characterized in that The method comprises computer program instructions for causing a computer to execute the method according to any one of claims 1 to 12.

35. A computer program product, characterized in that The method comprises computer program instructions for causing a computer to perform the method as claimed in any one of claims 13 to 25.

Images