Physical random access channel transmission method and device, terminal equipment and network equipment

Abstract

The invention discloses a physical random access channel transmission method and device, terminal equipment and network equipment, and relates to the technical field of communication. The method comprises the step of performing physical random access channel (PRACH) transmission according to a first effective physical random access channel opportunity RO obtained by sub-band full duplex SBFD configuration. Visibly, as the PRACH transmission relates to the transmission of the RA preamble random access request message by using the RO, and the traditional RO is usually obtained by non-SBFD configuration, the SBFD can be configured through the network, the RO obtained by the SBFD configuration is obtained, and then the PRACH transmission is performed according to the first effective RO, so that the SBFD and the PRACH transmission are combined, and the enhanced PRACH transmission is realized.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a physical random access channel transmission method and apparatus, terminal equipment, and network equipment. Background Art

[0002] The standard protocol specified by the 3rd Generation Partnership Project (3GPP) introduced relevant research on the random access process. In the relevant research, the terminal device will use the physical random access channel occupancy (PRACH occupancy, referred to as RO) to transmit the random access preamble (RA preamble) / random access request message. Among them, the RApreamble / random access request message can be used to request access to the network, so that the network device can estimate the transmission delay between the terminal device and the RApreamble / random access request message based on the RApreamble / random access request message and calibrate the uplink timing to perform related PRACH transmission.

[0003] At present, PRACH transmission is mainly for frequency division duplexing (FDD) system and time division duplexing (TDD) system. Compared with the FDD system that uses symmetrical spectrum to distinguish uplink and downlink, the TDD system can divide different time slots into uplink or downlink and use asymmetric spectrum to achieve flexible configuration of time slots. However, the TDD system also has limitations on the ratio of uplink and downlink time slots, resulting in a large transmission delay in the TDD system.

[0004] Based on this, in order to avoid the limitation of uplink and downlink time slot ratio as much as possible, 3GPP is discussing subband full duplex (SBFD), that is, dividing non-overlapping uplink subbands and downlink subbands in the frequency domain of the same TDD carrier, so as to support uplink and downlink transmission at the same time, improve spectrum utilization and flexibility. However, how to combine SBFD with PRACH transmission to achieve enhanced PRACH transmission still needs further study. Summary of the invention

[0005] The present application provides a physical random access channel transmission method and apparatus, a terminal device and a network device, in the hope of combining SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0006] In a first aspect, a physical random access channel transmission method of the present application includes:

[0007] The physical random access channel PRACH transmission is performed according to the first valid physical random access channel opportunity RO obtained according to the sub-band full-duplex SBFD configuration.

[0008] It can be seen that since PRACH transmission involves the use of RO to transmit the RA preamble random access request message, and the traditional RO is usually obtained by non-SBFD configuration, the present application can configure SBFD through the network, and obtain the RO obtained by the SBFD configuration, and then perform PRACH transmission according to the first valid RO, thereby combining SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0009] In a second aspect, a physical random access channel transmission device of the present application includes:

[0010] The transmission unit is used to perform physical random access channel PRACH transmission according to the first valid physical random access channel opportunity RO obtained by the sub-band full-duplex SBFD configuration.

[0011] In a third aspect, the steps in the method designed in the first aspect are applied to a terminal device or in a terminal device.

[0012] In a fourth aspect, the steps in the method designed in the first aspect are applied to a network device or in a network device.

[0013] The fifth aspect is a terminal device of the present application, comprising a processor, a memory, and a computer program or instructions stored on the memory, wherein the processor executes the computer program or instructions to implement the steps in the method designed in the first aspect above.

[0014] The sixth aspect is a network device of the present application, comprising a processor, a memory, and a computer program or instructions stored on the memory, wherein the processor executes the computer program or instructions to implement the steps in the method designed in the first aspect above.

[0015] The seventh aspect is a chip of the present application, comprising a processor and a communication interface, wherein the processor executes the steps in the method designed in the first aspect above.

[0016] The eighth aspect is a chip module of the present application, including a transceiver component and a chip, wherein the chip includes a processor, wherein the processor executes the steps in the method designed in the above-mentioned first aspect.

[0017] The ninth aspect is a computer-readable storage medium of the present application, wherein the computer program or instruction is stored therein, and when the computer program or instruction is executed, the steps in the method designed in the first aspect are implemented. For example, the computer program or instruction is executed by a processor.

[0018] The tenth aspect is a computer program product of the present application, comprising a computer program or instructions, wherein when the computer program or instructions are executed, the steps in the method designed in the first aspect are implemented. For example, the computer program or instructions are executed by a processor.

[0019] The beneficial effects brought about by the technical solutions of the second to tenth aspects can be referred to the technical effects brought about by the technical solution of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0021] Figure 1 It is a schematic diagram of the architecture of a communication system according to an embodiment of the present application;

[0022] Figure 2 It is a structural diagram of a mapping relationship between SSB and RO in an embodiment of the present application;

[0023] Figure 3 It is a structural diagram of another mapping relationship between SSB and RO in an embodiment of the present application;

[0024] Figure 4 It is a structural diagram of another mapping relationship between SSB and RO in an embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of a flexible duplex structure of an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of a full-duplex structure of an embodiment of the present application;

[0027] Figure 7 It is a structural diagram of the time-frequency domain position of an effective RO in an embodiment of the present application;

[0028] Figure 8 It is a structural diagram of the time-frequency domain position of another effective RO in an embodiment of the present application;

[0029] Fig. 9 It is a structural diagram of the time-frequency domain position of another effective RO in an embodiment of the present application;

[0030] Fig.10It is a structural diagram of the time-frequency domain position of another effective RO in an embodiment of the present application;

[0031] Fig.11 It is a flow chart of a physical random access channel transmission method according to an embodiment of the present application;

[0032] Fig.12 It is a block diagram of the functional units of a physical random access channel transmission device according to an embodiment of the present application;

[0033] Fig.13 is a schematic diagram of the structure of a terminal device according to an embodiment of the present application;

[0034] Fig.14 It is a structural diagram of a network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] It should be understood that the terms "first", "second", etc. involved in the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, software, product, or device that includes a series of steps or units is not limited to the listed steps or units, but also includes steps or units that are not listed, or also includes other steps or units inherent to these processes, methods, products, or devices.

[0036] The "embodiment" involved in the embodiments of the present application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the embodiments of the present application, "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent the following three situations: A exists alone; A and B exist at the same time; B exists alone. Among them, A and B can be singular or plural.

[0038] In the embodiment of the present application, the symbol " / " can indicate that the objects associated with each other are in an "or" relationship. In addition, the symbol " / " can also indicate a division sign, that is, performing a division operation. For example, A / B can indicate A divided by B.

[0039] In the embodiments of the present application, "at least one item" or similar expressions refer to any combination of these items, including any combination of single items or plural items, and refer to one or more, and multiple refers to two or more. For example, at least one item of a, b, or c can represent the following seven situations: a, b, c, a and b, a and c, b and c, a, b, and c. Among them, each of a, b, and c can be an element or a set containing one or more elements.

[0040] In the embodiments of the present application, "equal to" can be used in conjunction with greater than, and is applicable to the technical solution adopted when greater than, and can also be used in conjunction with less than, and is applicable to the technical solution adopted when less than. When equal to is used in conjunction with greater than, it is not used in conjunction with less than; when equal to is used in conjunction with less than, it is not used in conjunction with greater than.

[0041] In the embodiments of the present application, the terms “of”, “corresponding / relevant”, “corresponding”, and “indicated” may sometimes be used interchangeably.

[0042] The words “associated with,” “corresponding to,” “corresponding to,” “is,” “of,” “for,” “belonging to,” “as,” and “regarded as” involved in the embodiments of the present application can sometimes be used interchangeably.

[0043] The "connection" in the embodiments of the present application refers to various connection methods such as direct connection or indirect connection to achieve communication between devices, and there is no limitation on this.

[0044] The “network” in the embodiments of the present application can be expressed as the same concept as the “system”, and the communication system is the communication network.

[0045] The following describes the relevant contents, concepts, meanings, technical issues, technical solutions and beneficial effects involved in the embodiments of the present application.

[0046] 1. Communication systems, terminal equipment and network equipment

[0047] 1. Communication system

[0048] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: 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-based Access to Unlicensed Spectrum (LTE-U) system on unlicensed spectrum, NR-based Access to Unlicensed Spectrum (NR-U) system on unlicensed spectrum, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wi-Fi), 6th Generation (6G) communication system or other communication systems.

[0049] It should be noted that the number of connections supported by traditional communication systems is limited and easy to implement. However, with the development of communication technology, communication systems can not only support traditional communication systems, but also support device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine type communication (MTC), vehicle-to-vehicle (V2V) communication, vehicle-to-everything (V2X) communication, narrowband Internet of things (NB-IoT) communication, etc. Therefore, the technical solutions of the embodiments of the present application can also be applied to the above communication systems.

[0050] In addition, the technical solutions of the embodiments of the present application can be applied to beamforming (beamforming), carrier aggregation (CA), dual connectivity (DC) or standalone (SA) deployment scenarios, etc.

[0051] In the embodiment of the present application, the spectrum used for communication between the terminal device and the network device can be a licensed frequency band or an unlicensed frequency band, and there is no limitation on this. In addition, the unlicensed frequency band can be understood as a shared frequency band, and the licensed spectrum can be understood as a non-shared frequency band.

[0052] Since the embodiments of the present application describe various embodiments in conjunction with terminal devices and network devices, the terminal devices and network devices involved will be described in detail below.

[0053] 2. Terminal equipment

[0054] Terminal equipment can be a device with transceiver functions, and can also be called terminal, user equipment (UE), remote terminal equipment (remote UE), relay equipment (relay UE), access terminal equipment, user unit, user station, mobile station, mobile station, remote station, mobile device, user terminal equipment, intelligent terminal equipment, wireless communication equipment, user agent or user device. It should be noted that relay equipment is a terminal equipment that can provide relay forwarding services for other terminal equipment (including remote terminal equipment).

[0055] For example, 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 unmanned autonomous driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

[0056] For another example, the terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, 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 communication system, a 6G communication system), or a terminal device in a future evolved public land mobile communication network (PLMN), etc., without specific limitation.

[0057] In some possible implementations, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; can be deployed on the water surface (such as ships, etc.); can be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0058] In some possible implementations, the terminal device may include a device with wireless communication functions, such as a chip system, a chip, or a chip module. For example, the chip system may include a chip and may also include other discrete devices.

[0059] In some possible implementations, the terminal device of the embodiments of the present application may be a chip, a chip module, a device, a unit, etc., without specific limitation.

[0060] 3. Network equipment

[0061] A network device may be a device with transceiver functions and may be used to communicate with a terminal device.

[0062] In some possible implementations, the network device may be responsible for radio resource management (RRM), quality of service (QoS) management, data compression and encryption, data transmission and reception, etc. on the air interface side.

[0063] In some possible implementations, the network device may include a base station (BS) in a communication system or a device deployed in a radio access network (RAN) for providing wireless communication functions, that is, the network device may include a device in the RAN.

[0064] For example, the devices in the RAN may include an evolved node B (evolutional node B, eNB or eNodeB) in an LTE communication system, a next generation evolved node B (next generation evolved node B, ng-eNB) in an NR communication system, a next generation node B (next generation node B, gNB) in an NR communication system, a master node (MN) in a dual-connection architecture, a second node or secondary node (SN) in a dual-connection architecture, etc., without specific limitation.

[0065] In some possible implementations, the network device may include a device in a core network (CN).

[0066] For example, the equipment in the CN may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc.

[0067] In some possible implementations, the network device may also be an access point (AP) in a WLAN, a relay station, a communication device in a future evolved PLMN network, a communication device in an NTN network, and the like.

[0068] In some possible implementations, the network device may include a device that provides wireless communication functions for the terminal device, such as a chip system, a chip, or a chip module. For example, the chip system may include a chip, or may include other discrete devices.

[0069] In some possible implementations, the network device may be a transmission and reception point (TRP).

[0070] In some possible implementations, the network device may communicate with an Internet Protocol (IP) network, such as the Internet, a private IP network, or other data networks.

[0071] In some possible implementations, the network device may include an independent node to implement the functions of the above-mentioned base station, or may include two or more independent nodes to implement the functions of the above-mentioned base station. For example, the network device includes a centralized unit (CU) and a distributed unit (DU), such as gNB-CU and gNB-DU. Further, in some other embodiments of the present application, the network device may also include an active antenna unit (AAU). Among them, the CU implements part of the functions of the network device, and the DU implements another part of the functions of the network device. For example, the CU is responsible for processing non-real-time protocols and services, and implements the functions of the radio resource control (RRC) layer, the service data adaptation protocol (SDAP) layer, and the packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, and implements the functions of the radio link control (RLC) layer, the medium access control (MAC) layer, and the physical (PHY) layer. In addition, the AAU can implement some physical layer processing functions, radio frequency processing, and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this network deployment, high-level signaling (such as RRC signaling) can be considered to be generated by the CU, sent by the DU, or sent by the DU and the AAU. It can be understood that the network device may include at least one of the CU, DU, and AAU. In addition, the CU can be divided into a RAN device, or the CU can be divided into a core network device, without specific limitation.

[0072] In some possible implementations, the network device may be any one of the multiple sites that perform coherent joint transmission (CJT) with the terminal device, or other sites outside the multiple sites, or other network devices that perform network communication with the terminal device, and there is no specific limitation on this. Among them, multi-site coherent joint transmission may be multiple sites coherent transmission, or different data belonging to the same physical downlink shared channel (PDSCH) are sent from different sites to the terminal device, or multiple sites are virtualized into one site for transmission, and names with the same meaning specified in other standards are also applicable to this application, that is, this application does not limit the names of these parameters. The sites in the multi-site coherent joint transmission may be a remote radio head (RRH), a TRP, etc., and there is no specific limitation on this.

[0073] In some possible implementations, the network device may be any site in the multi-site that performs incoherent joint transmission with the terminal device, or other sites outside the multi-site, or other network devices that perform network communication with the terminal device, and there is no specific limitation on this. Among them, multi-site incoherent joint transmission can be multiple sites joint incoherent transmission, or different data belonging to the same PDSCH is sent from different sites to the terminal device, and the names with the same meaning specified in other standards are also applicable to this application, that is, this application does not limit the names of these parameters. The sites in the multi-site incoherent joint transmission can be RRH, TRP, etc., and there is no specific limitation on this. The transmission scheme of multiple TRPs may include S-DCIbased M-TRP) transmission scheme, and may also include M-DCI based M-TRP transmission scheme.

[0074] It should be noted that the TRP of the present application is not limited to coherent joint transmission or incoherent joint transmission scenarios, but can also be applied to other scenarios without specific restrictions.

[0075] In some possible implementations, the network device may have a mobile feature, for example, the network device may be a mobile device. Optionally, 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.

[0076] In some possible implementations, a network device may provide services for a cell, and a terminal device in the cell may communicate with the network device through transmission resources (such as spectrum resources). The cell may be a macrocell, a small cell, a metro cell, a microcell, a pico cell, a femto cell, etc.

[0077] In some possible implementations, the network device of the embodiments of the present application may be a chip, a chip module, a device, a unit, etc., without specific limitation.

[0078] 4. Example

[0079] The following is an exemplary description of the communication system in an embodiment of the present application.

[0080] For example, a network architecture of a communication system in an embodiment of the present application can be found at Figure 1 .like Figure 1 As shown, the communication system 10 may include a network device 110 and a terminal device 120. The terminal device 120 may communicate with the network device 110 in a wireless manner.

[0081] Figure 1 This is merely an example of a network architecture of a communication system and does not constitute a limitation on the network architecture of the communication system in the embodiment of the present application.

[0082] For example, the communication system 10 may also include a server or other devices.

[0083] For another example, the communication system 10 may include other network devices in addition to the network device 110 .

[0084] For another example, the communication system 10 may include other terminal devices in addition to the terminal device 120 .

[0085] 2. Random Access Process

[0086] 1. 4-step random access process and 2-step random access process

[0087] For 4-step random access, the entire process includes 4 steps: transmission of a random access request message, transmission of a random access response (RAR) message (also called message 2 (Msg2)), transmission of message 3 (Msg3) and transmission of message 4 (Msg4).

[0088] The random access request message may include a random access preamble (RApreamble). The main function of the RA preamble may be to request access to the network device, so that the network device can estimate the transmission delay between the network device and the terminal device based on the RApreamble and calibrate the uplink timing, and indicate it to the terminal device through the RAR message.

[0089] Compared with the 4-step random access process, the 2-step random access process helps to reduce the access delay of the terminal device. The 2-step random access process mainly includes the following two steps: transmission of message A (MsgA) and message B (MsgB).

[0090] MsgA may include RA preamble and physical uplink shared channel (PUSCH) payload. MsgB may include Msg2 and Msg4. Msg2 here refers to Msg2 in the above 4-step random access process, and Msg4 refers to Msg4 in the above 4-step random access process.

[0091] 2. RA preamble

[0092]

Composition of RA preamble

[0093] RApreamble can be composed of a cyclic prefix (CP) and a sequence.

[0094] RA preamble can support 4 long sequences with a length of 839 and 9 short sequences with a length of 139, and the length of the sequence composed of RA preamble can be indicated by the high-level parameter prach-RootSequenceIndex.

[0095] Each cell has 64 available RA preambles, forming an RA preamble sequence, and each RA preamble has a unique index (RA preamble index) in the RA preamble sequence. Among them, the terminal device will select one (or the network device will specify one) RA preamble from the RA preamble sequence to use the physical random access channel opportunity (PRACH occation, RO) for transmission, that is, the RA preamble is carried (or transmitted) by the PRACH occation.

[0096] [PRACH time-frequency resources]

[0097] In the random access process, the transmission of the PRACH message requires time-frequency resources, and the PRACH time-frequency resources are divided to obtain at least one physical random access channel occasion (PRACH occasion, RO). Among them, RO is used to transmit or carry the random access request message. RO may include time domain resources and frequency domain resources. Specifically, the time domain resources can be indicated by the index of the time domain resources, and the frequency domain resources can be indicated by the index of the frequency domain resources.

[0098] The time domain position or time domain resource of the RO, that is, the PRACH time domain resource used to transmit / carry the RA premble / Msg1, can be configured to the terminal device by the network device through the parameter prach-ConfigurationIndex in the high-level parameter RACH-ConfigGeneric. For example, the specific configuration method can be seen in Table 1.

[0099] Table 1 defines the random access configurations for FR1 and paired spectrum / supplemental uplink. f Indicates the system frame number, x indicates the PRACH configuration period, The number of ROs in a PRACH time slot, Indicates the time domain symbol length of an RO.

[0100] Table 1

[0101]

[0102] For example, when the PRACH Configuration Index is 109, the following exists:

[0103] The random access preamble format uses A1 / B1;

[0104] Every two system frames (i.e., the system frame index is an even number 0, 2, 4, ...) contain RO (i.e., n f mod 2 = 0);

[0105] The starting position of the RO time domain resource is in the 4th subframe of the system frame, starting from the 0th OFDM symbol;

[0106] There are 2 PRACH slots in the 4th subframe, and each PRACH slot has 7 A time domain RO;

[0107] RO length is 2 That is, it occupies 2 OFDM symbols.

[0108] It should be noted that, in an embodiment of the present application, the time domain resources identified by the indexes of two adjacent time domain resources may be continuous or discontinuous. For example, when the time domain resources are indexed as index 0 and index 1, the time domain resources identified by index 0 are the 0th to 1st OFDM symbols in the 4th subframe in the system frame, and the time domain resources identified by index 1 are the 2nd to 3rd OFDM symbols in the 4th subframe in the system frame.

[0109] The parameter msg1-FrequencyStart in the high-level parameter RACH-ConfigGeneric can be used to configure the offset (offset) from the starting frequency domain position of the RO to the starting frequency domain position of the initial BWP (intial BWP) or the current active BWP (active BWP).

[0110] The parameter msg1-FDM in the high-level parameter RACH-ConfigGeneric may be used to configure the number of frequency domain resource indexes of the RO, or the number of frequency domain ROs at the same time domain position.

[0111] For example, the parameter msg1-FDM=4 may indicate that there are 4 frequency domain ROs at the same time domain position.

[0112] [Mapping between synchronization signal block (Synchronization Signal and PBCH block, SSB) and beam]

[0113] In the 5G NR communication system, the cell frequency increases, and accordingly, the coverage range decreases. In order to increase the coverage range of the cell, some broadcast information can no longer be sent in the form of coverage, but in the form of beam sweeping.

[0114] Beam scanning is to concentrate energy in a certain direction at a certain moment, so that the signal can be sent farther in this direction, but the signal cannot be received in other directions; then, send in another direction at the next moment; finally, by constantly changing the beam direction, the entire cell can be covered.

[0115] In the random access process of 5G NR, beams are used, and SSB has multiple transmission opportunities in the time domain period and has a corresponding index, namely the SSB index.

[0116] Each beam may correspond to (map / associated with) at least one SSB index, and the beams corresponding to different SSB indices may be the same (in the same direction) or different (in different directions).

[0117] SSB is in units of half-frame 5ms, which is an SS burst set. All SSBs in an SS burst set must be sent periodically in the same half-frame. SSB appears several times in a half-frame at intervals. Each of these SSBs corresponds to a beam scanning direction, and eventually there will be an SSB in each direction.

[0118] For the terminal device, when the SSB beam scanning signal covers the terminal device, the terminal device has the opportunity to send RA preamble, that is, the beam corresponds (associated / mapped) RA preamble. At this time, if the network device receives the RA preamble of the terminal device, the network device can know the best downlink beam or the best downlink beam. In other words, the network device knows which beam is pointing to the terminal device.

[0119] Since the beam corresponds to the RA preamble, and the beam corresponds to the SSB, the SSB needs to be mapped with the RA preamble. In addition, since the RA preamble needs to be sent based on the RO, that is, the RA preamble needs to be carried / transmitted by the RO, the SSB needs to be mapped with the RO so that the network device knows under which beam to send Msg2 to the terminal device.

[0120] [SSB mapping RO and SSB mapping RA preamble]

[0121] The network device can configure N (where N is configured by the L1 parameter SSB-per-rach-occasion) SSBs associated (mapped / corresponded) to one RO (N≥1) for the terminal device through the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB, or the network device can configure an SSB associated (mapped / corresponded) 1 / N (where N is configured by the L1 parameter SSB-per-rach-occasion) ROs (N<1) for the terminal device through the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB, and each SSB is associated (mapped / corresponded) to R (where R is configured by the L1 parameter CB-preambles-per-SSB) RA preamble indexes.

[0122] For example, the value of N may be {1 / 8, 1 / 4, 1 / 2, 1, 2, 4, 8, 16}.

[0123] There are two configurations for N:

[0124] One is that N<1, in which case one SSB can be associated with 1 / N valid ROs, where the preamble associated with the SSB starts with RA preamble index 0.

[0125] For example, if N=1 / 8, one SSB is associated with 8 ROs, and the preamble index of the starting point of the 8 ROs is 0.

[0126] The other is that N ≥ 1, in which case N SSBs are associated with one RO. For example, SSB n can select one from R preambles to send Msg1, 0 ≤ n ≤ N-1, n refers to the SSB index, and the preamble associated with SSB n is from the RA preamble index Start. Among them, It is configured by the higher-layer parameter totalNumberOfRA-Preambles and is an integer multiple of N.

[0127] For example, with N=2, For example, in this case, two SSBs are associated with one RO, the RA preamble index associated with SSB0 starts from 0, and the RA preamble index associated with SSB1 starts from 32. In other words, SSB0 is associated with RA preambles with indices from 0 to 31, and SSB1 is associated with RA preambles with indices from 32 to (the total number of corresponding RA preambles - 1).

[0128] It should be noted that for FDD (Frequency Division Duplexing) mode or paired spectrum, all ROs are valid.

[0129] For TDD (Time Division Duplexing) mode or unpaired spectrum, if the network side does not configure high-level parameters (such as tdd-UL-DL-ConfigurationCommon), for a RO in a PRACH time slot, when the RO is after the SSB in the PRACH time slot and starts no earlier than N after the last SSB symbol gap When N is equal to 1, the RO is valid, that is, a valid RO. gap The relationship between the RA preamble subcarrier spacing and the RA preamble subcarrier spacing is shown in Table 2.

[0130] For TDD mode or unpaired spectrum, if the network side configures high-level parameters (such as tdd-UL-DL-ConfigurationCommon), for a RO in a PRACH time slot, when the RO is in the uplink symbol, the RO is valid, that is, a valid RO. Or, when the RO is after the SSB in the PRACH time slot and starts no earlier than N after the last downlink symbol. gap symbols, and starts no earlier than N after the last SSB symbol gap symbols, the RO is valid, that is, a valid RO.

[0131] Table 2

[0132] RA preamble subcarrier spacing <![CDATA[N gap ]]> 1.25kHz or 5kHz 0 15kHz or 30kHz or 60kHz or 120kHz 2

[0133] In Table 2, for the RA preamble sequence with a subcarrier spacing (SCS) of 1.25kHz / 5kHz, N gap The value of is 0; for RA preamble sequences with subcarrier spacing (SCS) of 15kHz / 30kHz / 60kHz / 120kHz, N gap The value of is 2.

[0134] In summary, the mapping relationship between SSB and RO can be carried out in the following order:

[0135] First, the order of RA preamble indexes in a RO is increasing;

[0136] Secondly, the frequency resource index of the frequency multiplexed RO is in increasing order;

[0137] Again, the order of the time resource index of the time multiplexed RO in a PRACH time slot is increasing;

[0138] Finally, the order of PRACH slot indices is increasing.

[0139] The above-mentioned “mapping relationship between SSB and RO” is illustrated below with examples.

[0140] [Example 1]

[0141] For example, there are 8 SSBs configured in the cell, with their respective indexes 0 to 7, parameter msg1-FDM = 4, and parameter ssb-perRACH-Occasion = 1 / 4. In this case, the mapping relationship between SSB and RO is as follows: Figure 2 shown.

[0142] exist Figure 2 In the example, parameter msg1-FDM=4 indicates that on one time domain resource of RO, the frequency domain resource indexes of RO are index 0, index 1, index 2, and index 3.

[0143] The parameter ssb-perRACH-Occasion=1 / 4 (ie, N=1 / 4) means that 1 SSB maps 4 ROs.

[0144] Therefore, SSB 0 is mapped to four ROs in sequence in the ascending order of the frequency domain resource index, that is, the RO whose time domain resource index is index 0 and whose frequency domain resource indexes are index 0, index 1, index 2, and index 3.

[0145] Since the number of SSBs is 8, the SSBs have not been mapped yet. Therefore, according to the above-mentioned "mapping principle", SSB 1 is mapped to the 4 ROs in sequence in the ascending order of the frequency domain resource index. That is, when the time domain resource index of the RO is index1, the frequency domain resource index is index 0, index 1, index 2, index 3 in the RO, and so on.

[0146] [Example 2]

[0147] For example, there are 8 SSBs configured in the cell, with their respective indexes 0 to 7, parameter msg1-FDM = 4, and parameter ssb-perRACH-Occasion = 1. In this case, the mapping relationship between SSB and RO is as follows: Figure 3 shown.

[0148] exist Figure 3 In the example, parameter msg1-FDM=4 indicates that on one time domain resource of RO, the frequency domain resource indexes of RO are index 0, index 1, index 2, and index 3.

[0149] The parameter ssb-perRACH-Occasion = 1 means that 1 SSB maps to 1 RO. Therefore, in the order of increasing frequency domain resource index, SSB 0 to 3 are mapped to ROs with time domain resource index index 0 and frequency domain resource indexes index 0, index 1, index 2, and index 3, that is, when SSB 0 maps RO with time domain resource index index 0, the frequency domain resource index is index 0, and so on.

[0150] Since the number of SSBs is 8, the SSBs have not been mapped yet. Therefore, according to the above-mentioned "mapping principle", SSBs 4 to 7 are mapped in sequence in the ascending order of the frequency domain resource index to the RO with the time domain resource index of index 2 and the frequency domain resource indexes of index 0, index 1, index 2, index 3, and so on.

[0151] [Example 3]

[0152] For example, there are 8 SSBs configured in the cell, with their respective indexes 0 to 7, parameter msg1-FDM = 4, and parameter ssb-perRACH-Occasion = 2. In this case, the mapping relationship between SSB and RO is as follows: Figure 4 shown.

[0153] exist Figure 4 In the example, parameter msg1-FDM=4 indicates that on one time domain resource of RO, the frequency domain resource indexes of RO are index 0, index 1, index 2, and index 3.

[0154] The parameter ssb-perRACH-Occasion=2 means that 2 SSBs are mapped to 1 RO.

[0155] The specific mapping is as follows:

[0156] The index of the time domain resources mapped by SSB 0 / 1 is index 0, and the index of the frequency domain resources is RO with index 0, the index of the time domain resources mapped by SSB 2 / 3 is index 0, and the index of the frequency domain resources is RO with index 1, the index of the time domain resources mapped by SSB4 / 5 is index 0, and the index of the frequency domain resources is RO with index 2, and the index of the time domain resources mapped by SSB 6 / 7 is index 0, and the index of the frequency domain resources is RO with index 3.

[0157] The same applies to the rest.

[0158]

CSI-RS mapping RO

[0159] CSI-RS is similar to SSB, and CSI-RS ID corresponds to beam. If the random access process is triggered by a high-level request and the CSI-RS index is associated with RO, then when the parameter ra-PreambleIndex is not 0, the parameter ra-OccasionList indicates the RO set associated with the CSI-RS Index.

[0160] [PRACH transmission]

[0161] During the random access process, the terminal device can use RO to transmit (carry) Msg1. There are three ways to trigger the random access process:

[0162] PDCCH order trigger: The network device notifies the terminal device through a special DCI format 1_0 that a random access process needs to be initiated, and notifies the terminal device of the ra-PreambleIndex, SSB Index, PRACH MaskIndex, and UL / SUL Indicator indicating UL or SUL that should be used.

[0163] MAC layer triggering: The terminal device selects RA preamble to initiate the random access process.

[0164] RRC layer triggers: such as initial access, re-establishment, handover, transition from RRC_INACTIVE to RRC_CONNECTED state, request for other SI, RRC request during synchronization reconfiguration, etc.

[0165] To transmit Msg1, the terminal device needs to perform the following operations:

[0166] ◆Choose SSB or CSI-RS

[0167] It should be noted that the value range of the RA preamble index is associated (mapped / corresponded) with the SSB index or the CSI-RS index, and the SSB index or the CSI-RS index is mapped with the RO.

[0168] When selecting an SSB, the terminal device can obtain the SS-RSRP of the SSB through channel estimation, and then compare the SS-RSRP of the SSB with the parameter rsrp-ThresholdSSB. If there is an SSB whose SS-RSRP is greater than the parameter rsrp-ThresholdSSB, the terminal device selects the SSB; otherwise, the terminal device selects an SSB at random. If the SS-RSRP of multiple SSBs is greater than the parameter rsrp-ThresholdSSB, the terminal device selects an SSB at random from the multiple SSBs. The above is only an example of a strategy for selecting an SSB, and the embodiment of the present application does not limit the strategy for selecting an SSB.

[0169] When selecting a CSI-RS, the CSI-RSRP of the CSI-RS is compared with the parameter rsrp-ThresholdCSI-RS. If there is a CSI-RS whose CSI-RSRP is greater than the parameter rsrp-ThresholdCSI-RS, the terminal device selects the CSI-RS.

[0170] ◆Select RA preamble index

[0171] The RApreamble index may be selected by the terminal device or indicated by the network device.

[0172] ◆Select the PRACH resource used to carry (transmit) the RA preamble

[0173] ◆Determine the corresponding RA-RNTI

[0174] The time-frequency resource position of the RO determines the RA-RNTI value. After transmitting the RA preamble, the terminal device calculates the RA-RNTI based on the time-frequency resource position of the RO in order to receive the RAR scrambled by the RA-RNTI. The RA-RNTI calculation formula is as follows (not applicable to the non-contention-based random access preamble of the beam failure recovery request):

[0175] RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

[0176] Wherein, s_id is the index of the first OFDM symbol of RO (0≤s_id<14), t_id is the index of the first time slot of RO in the system frame (0≤t_id<80), f_id is the index of RO in the frequency domain (0≤f_id<8), and ul_carrier_id is the UL carrier used for RA preamble transmission (0 indicates normal uplink carrier, 1 indicates SUL carrier).

[0177] ◆Determine the target receiving power of RA preamble

[0178] 3. Transmission Mode

[0179] It should be noted that the present application may involve various transmission modes, such as TDD, FDD, flexible duplex, full duplex, subband full duplex (SBFD), etc. The following describes the time domain position, frequency domain position, TDD, FDD, flexible duplex, and full duplex.

[0180]

Time domain position and frequency domain position

[0181] The time domain position can be understood as the location of the resource used for transmission in the time domain. For example, the time domain position may include one of a subframe, a slot, a symbol, a mini slot, etc., and there is no specific limitation on this.

[0182] The frequency domain position can be understood as the location of the resource used for transmission in the frequency domain. For example, the frequency domain position may include one of a subband, a resource block (RB), a resource element (RE), a subcarrier, etc., and there is no specific limitation on this.

[0183] It should be noted that the sub-band here can be understood as a part of the sub-band divided from a bandwidth, wherein the bandwidth can be BWP.

[0184] Optionally, the same time domain position or the same frequency domain position may only support uplink transmission or only support downlink transmission. In other words, the transmission direction at the same time domain position or the same frequency domain position is the same. The specific need is determined according to the transmission mode.

[0185] Optionally, the same time domain position or the same frequency domain position can support both uplink transmission and downlink transmission. In other words, the transmission directions at the same time domain position or the same frequency domain position are different. The specific needs are determined according to the transmission mode.

[0186]

TDD and FDD

[0187] For TDD, at the same frequency domain position, uplink transmission and downlink transmission use different time domain positions respectively, and the transmission direction at the same time domain position is the same, that is, either uplink transmission or downlink transmission.

[0188] For example, taking the time domain position as a time slot, the network configures time slot n and time slot n+1 to support downlink transmission, and configures time slot n+2 to support uplink transmission. At this time, the network device and the terminal device can only communicate downlink on time slot n and time slot n+1, and the network device and the terminal device can only communicate uplink on time slot n+2.

[0189] For FDD, at the same time domain position, uplink transmission and downlink transmission use different frequency domain positions respectively, and the transmission direction at the same frequency domain position is the same, that is, either uplink transmission or downlink transmission.

[0190]

Flexible Duplex

[0191] It should be noted that the flexible duplex may include flexible TDD duplex and / or flexible FDD duplex. Flexible duplex can be used to meet different transmission requirements and improve the flexibility of the transmission mode.

[0192] For TDD duplexing, at the same frequency domain position, there are flexible time domain positions and non-flexible time domain positions.

[0193] The non-flexible time domain position can be understood as the supported transmission direction will not change dynamically, which is similar to the description in the above “TDD”.

[0194] Flexible time domain location can be understood as the transmission direction it supports changing dynamically. That is, for the same flexible time domain location, the network can schedule / configure a cell or a terminal device to support downlink transmission, and schedule / configure another cell or another terminal device to support uplink transmission.

[0195] For example, taking the time domain position as a time slot, Figure 5 As shown, at one or more frequency domain locations, the network configures time slot n and time slot n+1 to support downlink transmission, configures time slot n+4 to support uplink transmission, and configures time slot n+2 and time slot n+3 as flexible.

[0196]

Full-duplex

[0197] It should be noted that for full-duplex, it can be understood that the same time domain position or the same frequency domain position can support uplink transmission and downlink transmission at the same time; or, different frequency domain positions on the same time domain position can respectively support uplink transmission and downlink transmission; or, different time domain positions on the same frequency domain position can respectively support uplink transmission and downlink transmission.

[0198] For example, the time domain position is a time slot, such as Figure 6 As shown, the network configuration is as follows:

[0199] Time slot n supports downlink transmission; time slot n+1, time slot n+2 and time slot n+3 all support uplink transmission and downlink transmission at the same time, that is, for time slot n+1, time slot n+2 and time slot n+3, there are frequency domain positions supporting uplink transmission and frequency domain positions supporting downlink transmission; time slot n supports uplink transmission.

[0200]

SBFD

[0201] In a TDD system, all frequency domain resources of a TDD carrier must have the same transmission direction at the same time, that is, uplink or downlink, which also results in the inability to flexibly configure the uplink and downlink time slot ratios of different frequency domain resources on a TDD carrier. In addition, with the diversification of services, especially considering the business needs of vertical industries, different services have certain differences in the requirements for uplink and downlink transmission, making a single uplink and downlink time slot ratio unable to meet the needs of different services.

[0202] Based on this, in order to avoid the limitation of uplink and downlink time slot ratio as much as possible and taking into account the complexity of base station implementation, 3GPP is discussing SBFD, which is to divide non-overlapping uplink sub-bands and downlink sub-bands in the frequency domain of the same TDD carrier so as to support uplink and downlink transmission at the same time.

[0203] Optionally, the network may configure SBFD through network signaling (such as DCI, MAC signaling, system information, etc.), and SBFD may be in different specific forms.

[0204] For example, originally a downlink symbol in a time slot can only be used for downlink transmission. Now, the network can configure a portion of uplink subbands in the frequency domain of the downlink symbol so that the downlink symbol can support uplink transmission and downlink transmission, thereby implementing the SBFD operation.

[0205] For another example, the network can configure the flexible symbol in the original time slot to be used for uplink transmission or downlink transmission, but not for both. Now, the network can configure a part of the uplink subband and a part of the downlink subband in the frequency domain of the flexible symbol, so that the flexible symbol can support uplink transmission and downlink transmission, thereby realizing the configuration of SBFD operation.

[0206] For another example, the uplink symbol in the original time slot can only be used for uplink transmission. Now, the network can configure a part of downlink subbands in the frequency domain of the uplink symbol so that the uplink symbol can support uplink transmission and downlink transmission, thereby realizing the configuration of SBFD operation.

[0207] 4. A PRACH transmission enhancement method

[0208] 1. Description

[0209] Since the TDD system has limitations on the uplink and downlink time slot ratio, and SBFD can achieve uplink and downlink transmission at the same time, which is beneficial to improving spectrum utilization and flexibility, the present application can combine SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0210] In specific implementation, since PRACH transmission involves the use of RO to transmit RA preamble random access request message, and the traditional RO is usually obtained by non-SBFD configuration, the present application can configure SBFD through the network, and obtain the RO obtained by the SBFD configuration, and then perform PRACH transmission according to the first valid RO, thereby combining SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0211] In combination with the above content, the technical solutions, beneficial effects, concepts, etc. involved in the embodiments of the present application are described in detail below.

[0212] 2. Specific instructions

[0213] It should be noted that the contents in the following sections may be combined and related to each other, may be parallel to each other, or may be independent of each other, and there is no specific limitation on this.

[0214] 1) Non-SBFD symbols and SBFD symbols

[0215]

symbol

[0216] The “symbol” mentioned in the present application may be an OFDM symbol, which may include a downlink symbol, an uplink symbol, and a flexible symbol.

[0217] Among them, downlink symbols can only support downlink transmission; uplink symbols can only support downlink transmission; flexible symbols can be configured by the network to support uplink transmission or downlink transmission, that is, only one transmission mode is supported.

[0218] Optionally, the symbol may be configured by the network through network signaling (such as MAC signaling, MAC CE, DCI, system information, etc.).

[0219] [Non-SBFD symbols]

[0220] The non-SBFD symbol may be understood as a symbol that is not / is not configured for SBFD operation, or an original symbol in the time slot.

[0221] In other words, the original symbol's attribute of supporting uplink or downlink transmission has not changed because SBFD is not configured. That is, the original downlink symbol can only support downlink transmission; the original uplink symbol can only support downlink transmission; the original flexible symbol can be configured by the network to support uplink or downlink transmission, that is, it only supports one transmission mode.

[0222] It should be noted that, in order to distinguish from the SBFD symbols appearing below, the present application introduces "non-SBFD downlink symbols", "non-SBFD uplink symbols" and "non-SBFD flexible symbols".

[0223] Non-SBFD downlink symbols can be understood as downlink symbols that are not configured for SBFD operation or original downlink symbols. Therefore, non-SBFD downlink symbols can only support downlink transmission.

[0224] Non-SBFD uplink symbols can be understood as uplink symbols that are not configured for SBFD operation or original uplink symbols. Therefore, non-SBFD uplink symbols can only support uplink transmission.

[0225] Non-SBFD flexible symbols can be understood as flexible symbols that are not configured for SBFD operation, or original flexible symbols. Therefore, non-SBFD flexible symbols can be configured by the network to support uplink transmission or downlink transmission, that is, only one transmission mode is supported.

[0226] Optionally, non-SBFD symbols may include non-SBFD downlink symbols, non-SBFD uplink symbols, and non-SBFD flexible symbols, and may include original downlink symbols, original uplink symbols, and original flexible symbols.

[0227]

SBFD symbol

[0228] The SBFD symbol can be understood as a symbol that has been configured for SBFD operation.

[0229] That is, the property of whether the original symbol supports uplink transmission or downlink transmission changes due to the configuration of SBFD.

[0230] It should be noted that, in order to distinguish from the non-SBFD symbols mentioned above, this application introduces "SBFD downlink symbols", "SBFD uplink symbols" and "SBFD flexible symbols".

[0231] The SBFD downlink symbol can be understood as a downlink symbol configured for SBFD operation. Therefore, the SBFD downlink symbol can support downlink transmission and uplink transmission.

[0232] For example, the network may configure a portion of uplink subbands in the frequency domain of downlink symbols in the original time slot through network signaling, so that the downlink symbols can support uplink transmission and downlink transmission, thereby configuring the SBFD operation.

[0233] The SBFD uplink symbol can be understood as an uplink symbol configured for SBFD operation. Therefore, the SBFD uplink symbol can support uplink transmission and downlink transmission.

[0234] For example, the network may configure a portion of downlink subbands in the frequency domain of the uplink symbol in the original time slot through network signaling, so that the uplink symbol can support uplink transmission and downlink transmission, thereby configuring the SBFD operation.

[0235] The SBFD flexible symbol can be understood as a flexible symbol configured for SBFD operation. Therefore, the SBFD flexible symbol can be configured by the network to support uplink transmission and downlink transmission, that is, to support uplink and downlink transmission at the same time.

[0236] For example, the network may configure a portion of uplink subbands and a portion of downlink subbands in the frequency domain of the flexible symbol in the original time slot through network signaling, so that the flexible symbol can support uplink transmission and downlink transmission, thereby configuring the SBFD operation.

[0237] Optionally, the SBFD symbol may include a SBFD downlink symbol, a SBFD uplink symbol, and a SBFD flexible symbol.

[0238] 2) Traditional RO

[0239]

describe

[0240] For PRACH transmission in a traditional communication system (such as a TDD system or an FDD system), the traditional communication system will configure an RO and transmit the RA preamble / random access request message through the RO. In order to facilitate the distinction from the PRACH transmission in the SBFD communication system below, the present application may refer to the RO configured by the traditional communication system as a "traditional / original (legacy) RO". Optionally, the RO obtained by the non-SBFD configuration may include a valid RO and / or an invalid RO. Among them, a valid RO can be used to transmit a RA preamble / random access request message, while an invalid RO cannot be used to transmit a RA preamble / random access request message.

[0241] In addition, in order to distinguish from the "first valid RO" that appears later, the present application may refer to the valid ROs in the traditional / original ROs as "second valid ROs".

[0242]

Second effective RO

[0243] Combined with the content about "valid RO" in the above "SSB mapping RO and SSB mapping RA preamble", the second valid RO can be defined as follows:

[0244] The second valid RO may be within the PRACH time slot and within a non-SBFD uplink symbol (i.e., uplink symbol) or a non-SBFD flexible symbol (i.e., flexible symbol); and, the second valid RO may be within the PRACH time slot and start no earlier than a preset number of symbols after the last non-SBFD downlink symbol (i.e., the last downlink symbol), and / or start no earlier than a preset number of symbols after the SSB symbol; or,

[0245] The second valid RO is within the PRACH time slot and is within the uplink symbol or the flexible symbol, and starts no earlier than a preset number of symbols after the last downlink symbol, and / or starts no earlier than the preset number of symbols after the SSB symbol.

[0246] The start time is no earlier than a preset number of symbols after a non-SBFD downlink symbol, which can be understood as the second valid RO starts from at least a preset number of symbols after the last non-SBFD downlink symbol.

[0247] Optionally, a preset number of symbols may include N gap symbol.

[0248] For example, a preset number of symbols is N gap For example, Figure 7 As shown, the second valid RO is at least N after the last downlink symbol (ie, non-SBFD downlink symbol). gap (N gap =3) symbols start.

[0249] Optionally, the second effective RO may be configured using random access channel configuration information.

[0250] The random access channel configuration information may be transmitted by the network through network signaling, so that the network configures the second valid RO through the random access channel configuration information.

[0251] For example, in combination with the content in the above “II. Random Access Process”, the random access channel configuration information may include a high-level parameter RACH-ConfigGeneric, wherein the high-level parameter RACH-ConfigGeneric may include a parameter prach-ConfigurationIndex, a parameter msg1-FrequencyStart, and a parameter msg1-FDM.

[0252] 3) RO obtained by SBFD configuration

[0253]

describe

[0254] For PRACH transmission in a communication system configured with SBFD (hereinafter referred to as SBFD communication system), the SBFD communication system will configure RO and transmit RA preamble / random access request message through RO. In order to distinguish it from the PRACH transmission of the traditional communication system mentioned above, the present application may refer to the RO configured by the SBFD communication system as "RO obtained by SBFD configuration".

[0255] Optionally, the RO obtained by SBFD configuration may include a valid RO and / or an invalid RO, wherein a valid RO may be used to transmit a RA preamble / random access request message, while an invalid RO cannot be used to transmit a RA preamble / random access request message.

[0256] In addition, in order to distinguish from the "second valid RO" mentioned above, the present application may refer to the valid ROs among the ROs obtained by SBFD configuration as "first valid ROs".

[0257]

First effective RO

[0258] Different from the content about "valid RO" in the above "SSB mapping RO and SSB mapping RA preamble", this application needs to specifically define "first valid RO". That is, this application needs to define which ROs can be used as valid ROs from the ROs obtained by SBFD configuration.

[0259] The following provides a variety of definition methods, wherein the various methods may be independent of each other, may be interrelated, or may be combined to form a new method, so as to adapt to various scenario requirements and improve the flexibility of PRACH transmission.

[0260]

Method 1

[0261] In "method 1", the present application considers the case of switching from non-SBFD downlink symbols to SBFD symbols. The RO obtained by the SBFD configuration is defined from the frequency domain perspective and the time domain perspective respectively.

[0262] Frequency domain perspective

[0263] From the frequency domain perspective, the present application may define the RO in the uplink subband of the SBFD symbol as a valid RO. The SBFD symbol here may include SBFD downlink symbols, SBFD uplink symbols, and SBFD flexible symbols.

[0264] That is, the first valid RO may be in the uplink subband of the SBFD symbol.

[0265] In this way, since the uplink subband can support uplink transmission, the RO in the uplink subband can support the transmission of the RApreamble / random access request message, so that the RO can be regarded as valid.

[0266] Optionally, the first valid RO is in the uplink subband of the SBFD symbol, and may include: all resource blocks (RBs) of the first valid RO are in the uplink subband of the SBFD symbol.

[0267] It can be understood that all RBs of the first valid RO need to be in the uplink subband of the SBFD symbol. In this way, all RBs of the first valid RO can support uplink transmission.

[0268] Optionally, the first valid RO is in an uplink subband of the SBFD symbol and may include:

[0269] A portion of RBs of the first valid RO is in the uplink subband of the SBFD flexible symbol, and the remaining portion of RBs is in the downlink subband of the SBFD flexible symbol.

[0270] It is understandable that a part of the RBs of the first valid RO may be in the uplink subband of the SBFD symbol, and this part of the RBs can support uplink transmission. In this way, the present application can still use this part of the RBs to transmit PRACH, and does not consider that the entire RB cannot be used for uplink transmission because the remaining part of the RBs are in the downlink subband, thereby helping to improve spectrum utilization.

[0271] ◆Time domain angle

[0272] From the perspective of time domain, the present application may define a RO that starts no earlier than a preset number of symbols after the non-SBFD downlink symbol switches to the SBFD symbol as a valid RO.

[0273] That is, the first valid RO may start no earlier than a preset number of symbols after the non-SBFD downlink symbol is switched to the SBFD symbol.

[0274] The start no earlier than a preset number of symbols after the non-SBFD downlink symbol is switched to the SBFD symbol can be understood as the first valid RO starts at least a preset number of symbols after the non-SBFD downlink symbol is switched to the SBFD symbol.

[0275] The SBFD symbols here may include SBFD downlink symbols, SBFD uplink symbols, and SBFD flexible symbols.

[0276] The preset number of symbols may include N gap symbol.

[0277] In this way, since there is at least a preset number of symbols between the first valid RO and the non-SBFD downlink symbol in the time domain, the symbols in this interval are used to avoid interference between uplink transmission and downlink transmission.

[0278] ◆Example description

[0279] Take the SBFD symbol as an example, Figure 8As shown, time slot n includes multiple non-SBFD downlink symbols, and the non-SBFD downlink symbols have only downlink subbands; time slot n+1 includes multiple SBFD downlink symbols, and the SBFD downlink symbols have uplink subbands and downlink subbands. Figure 8 (a) shows that no valid RO has been defined, while Figure 8 (b) shows the case where a valid RO has been defined.

[0280] exist Figure 8 In (b), for the case of switching from a non-SBFD downlink symbol in time slot n to a SBFD downlink symbol in time slot n+1, the first valid RO is in the uplink subband of the SBFD downlink symbol, and at least N gap symbol starts.

[0281]

Method 2

[0282] In "mode 2", the present application considers the case of switching from non-SBFD uplink symbols or non-SBFD flexible symbols to SBFD symbols. The RO obtained by the SBFD configuration is defined from the frequency domain perspective and the time domain perspective respectively.

[0283] Frequency domain perspective

[0284] From the frequency domain perspective, the present application may define the RO in the uplink subband of the SBFD symbol as a valid RO. The SBFD symbol here may include SBFD downlink symbols, SBFD uplink symbols, and SBFD flexible symbols.

[0285] That is, the first valid RO may be in the uplink subband of the SBFD symbol.

[0286] In this way, since the uplink subband can support uplink transmission, the RO in the uplink subband can support the transmission of the RApreamble / random access request message, so that the RO can be regarded as valid.

[0287] Optionally, the first valid RO is in an uplink subband of the SBFD symbol, which may include: all RBs of the first valid RO are in an uplink subband of the SBFD symbol.

[0288] It can be understood that all RBs of the first valid RO need to be in the uplink subband of the SBFD symbol. In this way, all RBs of the first valid RO can support uplink transmission.

[0289] Optionally, the first valid RO is in an uplink subband of the SBFD symbol and may include:

[0290] A portion of RBs of the first valid RO is in the uplink subband of the SBFD flexible symbol, and the remaining portion of RBs is in the downlink subband of the SBFD flexible symbol.

[0291] It is understandable that a part of the RBs of the first valid RO may be in the uplink subband of the SBFD symbol, and this part of the RBs can support uplink transmission. In this way, the present application can still use this part of the RBs to transmit PRACH, and does not consider that the entire RB cannot be used for uplink transmission because the remaining part of the RBs are in the downlink subband, which is conducive to improving spectrum utilization.

[0292] ◆Time domain angle

[0293] From the perspective of the time domain, the present application may define the RO after switching from a non-SBFD uplink symbol or a non-SBFD flexible symbol to a SBFD symbol as a valid RO.

[0294] That is, the first valid RO may start from a non-SBFD uplink symbol or a non-SBFD flexible symbol switching to a SBFD symbol.

[0295] It can be understood that the difference between "method 2" and "method 1" is that there is no at least a preset number of symbols as an interval in the time domain.

[0296] The SBFD symbols here may include SBFD downlink symbols, SBFD uplink symbols, and SBFD flexible symbols.

[0297] The preset number of symbols may include N gap symbol.

[0298] In this way, since the non-SBFD uplink symbols or SBFD flexible symbols can originally support upload transmission, when switching from non-SBFD uplink symbols or SBFD flexible symbols to SBFD symbols, there is no need to set an interval between the effective RO and the non-SBFD uplink symbols or non-SBFD flexible symbols in the time domain, which is beneficial to improving resource utilization.

[0299] ◆Example description

[0300] Take non-SBFD uplink symbols as an example, Fig. 9 As shown, time slot n includes multiple non-SBFD uplink symbols, and the non-SBFD uplink symbols have only uplink subbands; time slot n+1 includes multiple SBFD downlink symbols, and the SBFD downlink symbols have uplink subbands and downlink subbands. Fig. 9 (a) shows that no valid RO has been defined, while Fig. 9 (b) shows the case where a valid RO has been defined.

[0301] exist Fig. 9In (b), for the case of switching from non-SBFD uplink symbols in time slot n to SBFD downlink symbols in time slot n+1, the first valid RO is in the uplink subband of the SBFD downlink symbol and starts at the switch from the non-SBFD uplink symbol to the SBFD downlink symbol.

[0302]

Method 3

[0303] In "method 3", the present application considers the case of switching from SBFD symbols to non-SBFD flexible symbols. The RO obtained by the SBFD configuration is defined from the perspective of the time domain and the perspective of the frequency domain.

[0304] ◆Time domain angle

[0305] From the perspective of time domain, the present application may define a RO that is within at least a preset number of symbols after the SBFD symbol is switched to a non-SBFD flexible symbol as a valid RO.

[0306] That is, the effective RO obtained by the SBFD configuration is within at least a preset number of symbols after the SBFD symbol is switched to the non-SBFD flexible symbol.

[0307] The SBFD symbols here may include SBFD downlink symbols, SBFD uplink symbols, and SBFD flexible symbols.

[0308] The preset number of symbols may include N gap symbol.

[0309] It should be noted that, in combination with the above definition of "second valid RO", the second valid RO may include non-SBFD flexible symbols. However, under the SBFD configuration, the present application may use the RO within at least a preset number of symbols after the SBFD symbol is switched to the non-SBFD flexible symbol as a valid RO, and this part of the valid RO may be regarded as a newly added valid RO under the second valid RO, and this part of the newly added valid RO is used to transmit PRACH, which is conducive to improving the spectrum utilization efficiency.

[0310] Frequency domain perspective

[0311] From the perspective of frequency domain, the present application may define that the uplink subband of the first effective RO and the SBFD symbol have the same frequency domain position.

[0312] The SBFD symbol here can be understood as switching from the SBFD symbol to the SBFD symbol in the non-SBFD flexible symbol.

[0313] The SBFD symbols here may include SBFD downlink symbols, SBFD uplink symbols, and SBFD flexible symbols; the preset number of symbols may include N gapsymbol.

[0314] ◆Example description

[0315] Take the SBFD symbol as an example, Fig.10 As shown, time slot n includes multiple non-SBFD downlink symbols, and the non-SBFD downlink symbols have only downlink subbands; time slot n+1 includes multiple SBFD downlink symbols, and the SBFD downlink symbols have uplink subbands and downlink subbands; time slot n+2 includes multiple non-SBFD flexible symbols, and the non-SBFD flexible symbols have flexible subbands, which can be configured by the network to support uplink transmission or downlink transmission. Among them, Fig.10 (a) shows that no valid RO has been defined, while Fig.10 (b) shows the case where a valid RO has been defined.

[0316] exist Fig.10 In (b), for the case where the SBFD downlink symbol of time slot n+1 is switched to the non-SBFD flexible symbol of time slot n+2, the first valid RO is at least N times after the SBFD downlink symbol is switched to the non-SBFD flexible symbol. gap symbols, and has the same frequency domain position as the uplink subband of the SBFD downlink symbol.

[0317]

Method 4

[0318] In "Method 4", combined with the content in "II. Random Access Process" above, the network can configure the frequency domain position of the RO in the SBFD communication system through the parameters msg1-FrequencyStart and msg1-FDM in the high-level parameter RACH-ConfigGeneric.

[0319] Since the parameter msg1-FDM configures multiple frequency domain ROs at the same time domain position, in this case, multiple frequency domain ROs at the same time domain position will exist in the RO obtained by the SBFD configuration.

[0320] At this time, for all frequency domain ROs at the same time domain position, since some of the frequency domain ROs may be in the uplink subband of the SBFD symbol and the rest of the frequency domain ROs are in the downlink subband, all frequency domain ROs may be in the uplink subband of the SBFD symbol, and all frequency domain ROs may be in the downlink subband of the SBFD symbol. Therefore, the present application can be defined as follows:

[0321] ◆If all the frequency-domain ROs are in the uplink subband of the SBFD symbol, then all the frequency-domain ROs are valid ROs.

[0322] That is to say, the first valid RO may be all frequency domain ROs at the same time domain position, and all the frequency domain ROs are in the uplink subband of the SBFD downlink symbol.

[0323] In this way, since the uplink subband can support uplink transmission, all frequency-domain ROs in the uplink subband can support the transmission of RA preamble / random access request message, so that all frequency-domain ROs can be regarded as valid.

[0324] ◆If there is a part of the frequency domain ROs among all the frequency domain ROs that are in the uplink subband of the SBFD symbol, then the part of the frequency domain ROs is a valid RO.

[0325] That is to say, the first valid RO may be a portion of the frequency domain ROs that are only in the uplink subband of the SBFD symbol among all the frequency domain ROs at the same time domain position.

[0326] It can be understood that a part of the frequency domain RO of the effective RO may be in the uplink subband of the SBFD symbol, and this part of the frequency domain RO can support uplink transmission.

[0327] In this way, the present application can still use this part of the frequency domain RO to transmit PRACH, instead of considering that all frequency domain ROs at the same time domain position cannot perform uplink transmission because the remaining frequency domain ROs are in the downlink subband, which is beneficial to improving spectrum utilization.

[0328]

Method 5

[0329] In "Method 5", combined with the content in "II. Random Access Process" above, the network can configure the time domain position of the RO in the SBFD communication system through the parameter prach-ConfigurationIndex in the high-level parameter RACH-ConfigGeneric.

[0330] Since the RO configured by the parameter prach-ConfigurationIndex may include multiple symbols, and these symbols may include SBFD symbols and / or non-SBFD symbols, for the RO obtained by the SBFD configuration, some of the symbols in the RO may be SBFD symbols and the rest of the symbols may be non-SBFD symbols, all the symbols may be SBFD symbols, and all the symbols may be non-SBFD symbols. In this regard, the present application may be defined as follows:

[0331] ◆If some symbols of a RO are in the uplink subband of SBFD symbols, and the remaining symbols of the RO are in non-SBFD uplink symbols or non-SBFD flexible symbols, the RO is a valid RO.

[0332] That is, some symbols of the first valid RO are in the uplink subband of SBFD symbols, and the remaining symbols are in non-SBFD uplink symbols or non-SBFD flexible symbols.

[0333] In this way, since the uplink subband of the SBFD symbol can support uplink transmission, and the non-SBFD uplink symbol or non-SBFD flexible symbol can also support uplink transmission, although the RO symbols exist across symbols, the RO can be regarded as valid because they can support the transmission of RApreamble / random access request messages.

[0334] 4) Mapping relationship between RO and SSB

[0335] Combined with the content in the above "II. Random Access Process", it can be known that the network device will configure the mapping relationship between RO and SSB through the high-level parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB to implement PRACH transmission. Therefore, the PRACH transmission in the SBFD communication system discussed in this application also needs to study the mapping relationship between RO and SSB.

[0336] Since the present application involves a "first valid RO" and a "second valid RO", the present application can flexibly select the following two methods to map RO to SSB according to scenario requirements / network configuration, etc., so as to improve the flexibility of PRACH transmission.

[0337]

The first method

[0338] In the "first method", the first valid RO can be jointly mapped with the second valid RO to perform unified mapping between RO and SSB.

[0339] That is, the first valid RO and the second valid RO are taken as a whole RO to uniformly perform mapping between the RO and the SSB.

[0340] In this way, since the mapping between RO and SSB is performed in a joint and unified manner, SSB can support SBFD and non-SBFD, thereby improving the compatibility of the communication system.

[0341] Optionally, the mapping relationship between the overall RO and SSB may be performed in the following order:

[0342] First, the order of RA preamble indexes in a RO is increasing;

[0343] Secondly, the frequency domain resource index order of the frequency division multiplexing RO is increasing;

[0344] Again, the order of the time domain resource indexes of the time division multiplexed ROs within a PRACH time slot is increasing;

[0345] Finally, the order of PRACH slot indices is increasing.

[0346] Please refer to the above “Example 1”, “Example 2” and “Example 3” for details, and I will not go into details here.

[0347] [Second method]

[0348] In the "second method", the first valid RO and the second valid RO can independently perform mapping between RO and SSB.

[0349] That is, the first valid RO is mapped with the SSB alone, and the second valid RO is mapped with the SSB alone.

[0350] In this way, since the mapping between RO and SSB is performed independently, although SSB cannot support SBFD and non-SBFD, it can ensure the stability of the communication system and reduce the complexity of the communication system.

[0351] Optionally, the first valid RO or the second valid RO may be mapped to the SSB separately in the following order:

[0352] First, the order of RA preamble indexes in a RO is increasing;

[0353] Secondly, the frequency domain resource index order of the frequency division multiplexing RO is increasing;

[0354] Again, the order of the time domain resource indexes of the time division multiplexed ROs within a PRACH time slot is increasing;

[0355] Finally, the order of PRACH slot indices is increasing.

[0356] Please refer to the above “Example 1”, “Example 2” and “Example 3” for details, and I will not go into details here.

[0357] 5) Configuration process of RO obtained by SBFD configuration

[0358] It should be noted that the first valid RO of the present application can be configured using random access channel configuration information.

[0359] The random access channel configuration information may be transmitted by the network through network signaling, so that the network configures the second valid RO through the random access channel configuration information.

[0360] For example, in combination with the content in the above “II. Random Access Process”, the random access channel configuration information may include a high-level parameter RACH-ConfigGeneric, wherein the high-level parameter RACH-ConfigGeneric may include a parameter prach-ConfigurationIndex, a parameter msg1-FrequencyStart, and a parameter msg1-FDM.

[0361] Since the second valid RO is also configured using the random access channel configuration information, the present application needs to explain the random access channel configuration information used by the first valid RO and the random access channel configuration information used by the second valid RO.

[0362] Optionally, the first valid RO and the second valid RO may be configured using the same random access channel configuration information.

[0363] In this way, since the same random access channel configuration information is used for configuration, the network can use the same set of random access channel configuration information to uniformly configure ROs for the traditional communication system and the SBFD communication system, thereby facilitating the improvement of the compatibility of the communication system.

[0364] Optionally, the first valid RO and the second valid RO may be configured using different random access channel configuration information respectively.

[0365] In this way, since different random access channel configuration information is used for configuration, the network can use different random access channel configuration information to independently configure RO to the traditional communication system and the SBFD communication system, thereby facilitating improving the stability of the communication system and reducing the complexity of the communication system.

[0366] Optionally, if the SBFD flexible symbol where the first valid RO is located comes from a non-SBFD flexible symbol, the RO obtained by the SBFD configuration and the RO obtained by the non-SBFD configuration are configured using the same random access channel configuration information.

[0367] It should be noted that when the network configures non-SBFD flexible symbols as SBFD flexible symbols and configures valid ROs on the SBFD flexible symbols, since the configuration from non-SBFD flexible symbols to SBFD flexible symbols requires switching from the traditional communication system to the SBFD communication system, and since the non-SBFD flexible symbols and the SBFD flexible symbols are configured to support uplink transmission, in order to minimize the time required for switching, or to avoid the inability to continue to support communication due to switching between different communication systems, the network can use the same set of random access channel configuration information to uniformly configure ROs to the traditional communication system and the SBFD communication system, which is beneficial to improving the compatibility of the communication system.

[0368] Optionally, if the SBFD flexible symbol where the first valid RO is located comes from a non-SBFD flexible symbol, the RO obtained by the SBFD configuration and the RO obtained by the non-SBFD configuration are configured using different random access channel configuration information.

[0369] It should be noted that since the configuration from non-SBFD flexible symbols to SBFD flexible symbols requires switching from the traditional communication system to the SBFD communication system, but since different communication systems may have poor compatibility, the network can use different random access channel configuration information to independently configure RO to the traditional communication system and the SBFD communication system, which is beneficial to improve the stability of the communication system and reduce the complexity of the communication system.

[0370] 3. Example of a PRACH transmission method

[0371]

describe

[0372] In combination with the above content, an example of a physical random access channel transmission method in an embodiment of the present application is introduced below. It should be noted that the method can be applied to a terminal device or a network device. Among them, the terminal device can be a chip, a chip module or a communication module, etc., and the network device can be a chip, a chip module or a communication module, etc.

[0373] like Fig.11 FIG. 1 is a flow chart of a physical random access channel transmission method according to an embodiment of the present application, which specifically includes the following steps:

[0374] S1101 . Perform physical random access channel PRACH transmission according to a first valid physical random access channel opportunity RO obtained by sub-band full-duplex SBFD configuration.

[0375] It should be noted that, for details of "SBFD", "RO", etc., please refer to the above contents, which will not be elaborated here.

[0376] It can be seen that since PRACH transmission involves the use of RO to transmit the RA preamble random access request message, and the traditional RO is usually obtained by non-SBFD configuration, the present application can configure SBFD through the network, and obtain the RO obtained by the SBFD configuration, and then perform PRACH transmission according to the first valid RO, thereby combining SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0377] Some possible implementations

[0378] In combination with the above content, some possible implementation methods are described below. For other methods not described, please refer to the above content for details, and no further elaboration will be given.

[0379] In some possible implementations, the first valid RO is in the uplink subband of the SBFD symbol.

[0380] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0381] In some possible implementations, the first valid RO starts no earlier than a preset number of symbols after the non-SBFD downlink symbol is switched to the SBFD symbol.

[0382] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0383] In some possible implementations, the first valid RO, in the uplink subband of the SBFD symbol, includes:

[0384] All resource blocks RB of the first valid RO are located in the uplink subband of the SBFD symbol.

[0385] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0386] In some possible implementations, the first valid RO, in the uplink subband of the SBFD symbol, includes:

[0387] A portion of RBs of the first valid RO is in the uplink subband of the SBFD flexible symbol, and the remaining portion of RBs is in the downlink subband of the SBFD flexible symbol.

[0388] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0389] In some possible implementations, the first valid RO is within at least a preset number of symbols after the SBFD symbol is switched to the non-SBFD flexible symbol; and / or,

[0390] The first effective RO has the same frequency domain position as the uplink subband of the SBFD symbol.

[0391] It should be noted that, combined with the content in the above-mentioned "Method 3", it can be seen that this will not be elaborated on.

[0392] In some possible implementations, the first effective RO is all frequency domain ROs at the same time domain position, and all frequency domain ROs are in the uplink subband of the SBFD symbol.

[0393] It should be noted that, combined with the content of the above-mentioned "Method 4", it can be seen that this will not be elaborated on.

[0394] In some possible implementations, the first effective RO is a partial frequency domain RO that is only located in the uplink subband of the SBFD symbol among all frequency domain ROs at the same time domain position.

[0395] It should be noted that, combined with the content of the above-mentioned "Method 4", it can be seen that this will not be elaborated on.

[0396] In some possible implementations, some symbols of the first valid RO are in uplink subbands of SBFD symbols, and the remaining symbols are in non-SBFD uplink symbols or non-SBFD flexible symbols.

[0397] It should be noted that, combined with the content of the above-mentioned "Method 5", it can be seen that this will not be elaborated on.

[0398] In some possible implementations, the first valid RO and the second valid RO jointly and uniformly perform mapping between the RO and the synchronization signal block SSB.

[0399] It should be noted that, combined with the content of the above “4) Mapping relationship between RO and SSB”, it can be seen that this will not be repeated here.

[0400] In some possible implementations, the first valid RO and the second valid RO each independently perform mapping between RO and SSB.

[0401] It should be noted that, combined with the content of the above “4) Mapping relationship between RO and SSB”, it can be seen that this will not be repeated here.

[0402] In some possible implementations, the first valid RO and the second valid RO are configured using the same random access channel configuration information.

[0403] It should be noted that, combined with the content in the above “5) Configuration process of RO obtained by SBFD configuration”, it can be seen that this will not be described in detail.

[0404] In some possible implementations, the first valid RO and the second valid RO are each configured using different random access channel configuration information.

[0405] It should be noted that, combined with the content in the above “5) Configuration process of RO obtained by SBFD configuration”, it can be seen that this will not be described in detail.

[0406] In some possible implementations, if the SBFD flexible symbol where the first valid RO is located comes from a non-SBFD flexible symbol, the RO obtained by the SBFD configuration and the RO obtained by the non-SBFD configuration are configured using the same or different random access channel configuration information.

[0407] It should be noted that, combined with the content in the above “5) Configuration process of RO obtained by SBFD configuration”, it can be seen that this will not be described in detail.

[0408] In some possible implementations, the second valid RO is within the PRACH time slot and is within a non-SBFD uplink symbol or a non-SBFD flexible symbol; and the second valid RO starts no earlier than a preset number of symbols after the last non-SBFD downlink symbol, and / or starts no earlier than the preset number of symbols after the SSB symbol; or,

[0409] The second valid RO is within the PRACH time slot and is within the uplink symbol or the flexible symbol, and starts no earlier than a preset number of symbols after the last downlink symbol, and / or starts no earlier than the preset number of symbols after the SSB symbol.

[0410] It should be noted that, combined with the content in the above “2) RO obtained by non-SBFD configuration”, it can be seen that this is not described in detail.

[0411] 5. Example of a physical random access channel transmission device

[0412]

describe

[0413] The above mainly introduces the scheme of the embodiment of the present application from the perspective of the method side. It is understandable that in order to realize the above functions, the terminal device or network device includes a hardware structure and / or software module corresponding to each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0414] The embodiment of the present application can divide the terminal device or network device into functional units according to the above method example. For example, each functional unit can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of a software program module. It should be noted that the division of units in the embodiment of the present application is schematic, which is only a logical function division, and there may be other division methods in actual implementation.

[0415] In the case of an integrated unit, Fig.12The physical random access channel transmission device 1200 comprises a transmission unit 1201 .

[0416] In some possible implementations, the transmission unit 1201 may be a module unit for processing signals, data, information, etc., and there is no specific limitation on this.

[0417] In some possible implementations, the physical random access channel transmission apparatus 1200 may further include a storage unit, which is used to store computer program codes or instructions executed by the physical random access channel transmission apparatus 1200. The storage unit may be a memory.

[0418] In some possible implementations, the physical random access channel transmission device 1200 may be a chip or a chip module.

[0419] In some possible implementations, the transmission unit 1201 may be integrated into other units.

[0420] For example, the transmission unit 1201 may be integrated into the communication unit.

[0421] For another example, the transmission unit 1201 may be integrated into the processing unit.

[0422] It should be noted that the communication unit may be a communication interface, a transceiver, a transceiver circuit, etc.

[0423] The processing unit may be a processor or a controller, for example, a baseband processor, a baseband chip, a central processing unit (CPU), a general processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processing unit may also be a combination that implements a computing function, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0424] In some possible implementations, the physical random access channel transmission device 1200 is used to execute any step executed by the terminal device / chip / chip module / network device, etc. in the above method embodiment.

[0425] In specific implementation, the transmission unit 1201 is used to execute any step in the above method embodiment, and when executing actions such as sending, other units can be selectively called to complete corresponding operations.

[0426] The transmission unit 1201 is configured to perform physical random access channel PRACH transmission according to the first valid physical random access channel opportunity RO obtained by the sub-band full-duplex SBFD configuration.

[0427] It can be seen that since PRACH transmission involves the use of RO to transmit the RA preamble random access request message, and the traditional RO is usually obtained by non-SBFD configuration, the present application can configure SBFD through the network, and obtain the RO obtained by the SBFD configuration, and then perform PRACH transmission according to the first valid RO, thereby combining SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0428] It should be noted that Fig.12 The specific implementation of each operation in the embodiment can be found in the description of the method embodiment shown above, and will not be described in detail here.

[0429] Some possible implementations

[0430] Some possible implementations are described below, wherein some specific descriptions can be found above, and will not be repeated here.

[0431] In some possible implementations, the first valid RO is in the uplink subband of the SBFD symbol.

[0432] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0433] In some possible implementations, the first valid RO starts no earlier than a preset number of symbols after the non-SBFD downlink symbol is switched to the SBFD symbol.

[0434] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0435] In some possible implementations, the first valid RO, in the uplink subband of the SBFD symbol, includes:

[0436] All resource blocks RB of the first valid RO are located in the uplink subband of the SBFD symbol.

[0437] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0438] In some possible implementations, the first valid RO, in the uplink subband of the SBFD symbol, includes:

[0439] A portion of RBs of the first valid RO is in the uplink subband of the SBFD flexible symbol, and the remaining portion of RBs is in the downlink subband of the SBFD flexible symbol.

[0440] It should be noted that, combined with the content in the above “Method 1”, it can be seen that this will not be elaborated on.

[0441] In some possible implementations, the first valid RO is within at least a preset number of symbols after the SBFD symbol is switched to the non-SBFD flexible symbol; and / or,

[0442] The first effective RO has the same frequency domain position as the uplink subband of the SBFD symbol.

[0443] It should be noted that, combined with the content in the above-mentioned "Method 3", it can be seen that this will not be elaborated on.

[0444] In some possible implementations, the first effective RO is all frequency domain ROs at the same time domain position, and all frequency domain ROs are in the uplink subband of the SBFD symbol.

[0445] It should be noted that, combined with the content of the above-mentioned "Method 4", it can be seen that this will not be elaborated on.

[0446] In some possible implementations, the first effective RO is a partial frequency domain RO that is only located in the uplink subband of the SBFD symbol among all frequency domain ROs at the same time domain position.

[0447] It should be noted that, combined with the content of the above-mentioned "Method 4", it can be seen that this will not be elaborated on.

[0448] In some possible implementations, some symbols of the first valid RO are in uplink subbands of SBFD symbols, and the remaining symbols are in non-SBFD uplink symbols or non-SBFD flexible symbols.

[0449] It should be noted that, combined with the content of the above-mentioned "Method 5", it can be seen that this will not be elaborated on.

[0450] In some possible implementations, the first valid RO and the second valid RO jointly and uniformly perform mapping between the RO and the synchronization signal block SSB.

[0451] It should be noted that, combined with the content of the above “4) Mapping relationship between RO and SSB”, it can be seen that this will not be repeated here.

[0452] In some possible implementations, the first valid RO and the second valid RO each independently perform mapping between RO and SSB.

[0453] It should be noted that, combined with the content of the above “4) Mapping relationship between RO and SSB”, it can be seen that this will not be repeated here.

[0454] In some possible implementations, the first valid RO and the second valid RO are configured using the same random access channel configuration information.

[0455] It should be noted that, combined with the content in the above “5) Configuration process of RO obtained by SBFD configuration”, it can be seen that this will not be described in detail.

[0456] In some possible implementations, the first valid RO and the second valid RO are each configured using different random access channel configuration information.

[0457] It should be noted that, combined with the content in the above “5) Configuration process of RO obtained by SBFD configuration”, it can be seen that this will not be described in detail.

[0458] In some possible implementations, if the SBFD flexible symbol where the first valid RO is located comes from a non-SBFD flexible symbol, the RO obtained by the SBFD configuration and the RO obtained by the non-SBFD configuration are configured using the same or different random access channel configuration information.

[0459] It should be noted that, combined with the content in the above “5) Configuration process of RO obtained by SBFD configuration”, it can be seen that this will not be described in detail.

[0460] In some possible implementations, the second valid RO is within the PRACH time slot and is within a non-SBFD uplink symbol or a non-SBFD flexible symbol; and the second valid RO is within the PRACH time slot and starts no earlier than a preset number of symbols after the last non-SBFD downlink symbol, and / or starts no earlier than a preset number of symbols after the SSB symbol; or,

[0461] The second valid RO is within the PRACH time slot and is within an uplink symbol or a flexible symbol and starts no earlier than a preset number of symbols after the last downlink symbol and / or starts no earlier than the preset number of symbols after the SSB symbol.

[0462] It should be noted that, combined with the content in the above “2) RO obtained by non-SBFD configuration”, it can be seen that this is not described in detail.

[0463] 6. Example of a terminal device

[0464] See also Fig.13 , Fig.13The terminal device 1300 may include a processor 1310 , a memory 1320 , and a communication bus for connecting the processor 1310 and the memory 1320 .

[0465] In some possible implementations, the memory 1320 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or portable read-only memory (CD-ROM), and the memory 1320 is used to store the program code executed by the terminal device 1300 and the transmitted data.

[0466] In some possible implementations, the terminal device 1300 also includes a communication interface for receiving and sending data.

[0467] In some possible implementations, the terminal device 1300 may be the first terminal device mentioned above.

[0468] In some possible implementations, the processor 1310 may be one or more CPUs. When the processor 1310 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0469] In some possible implementations, the processor 1310 may be a baseband chip, a chip, a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component or any combination thereof.

[0470] In a specific implementation, the processor 1310 in the terminal device 1300 is used to execute the computer program or instruction 1321 stored in the memory 1320 to perform the following operations:

[0471] The physical random access channel PRACH transmission is performed according to the first valid physical random access channel opportunity RO obtained according to the sub-band full-duplex SBFD configuration.

[0472] It can be seen that since PRACH transmission involves the use of RO to transmit the RA preamble random access request message, and the traditional RO is usually obtained by non-SBFD configuration, the present application can configure SBFD through the network, and obtain the RO obtained by the SBFD configuration, and then perform PRACH transmission according to the first valid RO, thereby combining SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0473] It should be noted that the specific implementation of each operation can adopt the corresponding description of the method embodiment shown above, and the terminal device 1300 can be used to execute the above method embodiment of the present application, which will not be repeated here.

[0474] VII. Example of a network device

[0475] See also Fig.14 , Fig.14 14 is a schematic diagram of a network device provided in an embodiment of the present application, wherein the network device 1400 includes a processor 1410 , a memory 1420 , and a communication bus for connecting the processor 1410 and the memory 1420 .

[0476] In some possible implementations, the memory 1420 includes but is not limited to RAM, ROM, EPROM or CD-ROM, and the memory 1420 is used to store relevant instructions and data.

[0477] In some possible implementations, the network device 1400 also includes a communication interface for receiving and sending data.

[0478] In some possible implementations, the processor 1410 may be one or more CPUs. When the processor 1410 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0479] In some possible implementations, the processor 1410 may be a baseband chip, a chip, a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component or any combination thereof.

[0480] In some possible implementations, the processor 1410 in the network device 1400 is used to execute the computer program or instruction 1421 stored in the memory 1420 to perform the following operations:

[0481] The physical random access channel PRACH transmission is performed according to the first valid physical random access channel opportunity RO obtained according to the sub-band full-duplex SBFD configuration.

[0482] It can be seen that since PRACH transmission involves the use of RO to transmit the RA preamble random access request message, and the traditional RO is usually obtained by non-SBFD configuration, the present application can configure SBFD through the network, and obtain the RO obtained by the SBFD configuration, and then perform PRACH transmission according to the first valid RO, thereby combining SBFD with PRACH transmission to achieve enhanced PRACH transmission.

[0483] It should be noted that the specific implementation of each operation can adopt the corresponding description of the method embodiment shown above, and the network device 1400 can be used to execute the above method embodiment of the present application, which will not be repeated here.

[0484] 8. Other related examples

[0485] In some possible implementations, the above method embodiments may be applied to or in a terminal device. That is, the execution subject of the above method embodiments may be a terminal device, a chip, a chip module or a module, etc., and no specific limitation is made to this.

[0486] In some possible implementations, the above method embodiments may be applied to or in network devices. That is, the execution subject of the above method embodiments may be a network device, a chip, a chip module or a module, etc., and no specific limitation is made to this.

[0487] An embodiment of the present application also provides a chip, including a processor, a memory, and a computer program or instructions stored in the memory, wherein the processor executes the computer program or instructions to implement the steps described in the above method embodiment.

[0488] An embodiment of the present application also provides a chip module, including a transceiver component and a chip, the chip including a processor, a memory and a computer program or instructions stored in the memory, wherein the processor executes the computer program or instructions to implement the steps described in the above method embodiment.

[0489] An embodiment of the present application also provides a computer-readable storage medium storing a computer program or instructions, which implements the steps described in the above method embodiment when executed.

[0490] The embodiment of the present application also provides a computer program product, including a computer program or instructions, which implement the steps described in the above method embodiment when executed.

[0491] An embodiment of the present application also provides a communication system, including the above-mentioned terminal device and the above-mentioned network device.

[0492] It should be noted that, for the above-mentioned various embodiments, for the sake of simple description, they are all expressed as a series of action combinations. Those skilled in the art should be aware that the present application is not limited by the described order of actions, because some steps in the embodiments of the present application can be performed in other orders or simultaneously. In addition, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions, steps, modules or units involved are not necessarily required by the embodiments of the present application.

[0493] In the above embodiments, the embodiments of the present application have different focuses on the description of each embodiment. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0494] The steps of the method or algorithm described in the embodiments of the present application can be implemented in hardware or by executing software instructions by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in RAM, flash memory, ROM, EPROM, electrically erasable programmable read-only memory (electrically EPROM, EEPROM), registers, hard disks, mobile hard disks, read-only compact disks (CD-ROMs) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a terminal device or a management device. Of course, the processor and the storage medium can also be present in a terminal device or a management device as discrete components.

[0495] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiments of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0496] The modules / units included in the devices and products described in the above embodiments may be software modules / units or hardware modules / units, or may be partially software modules / units and partially hardware modules / units. For example, for the devices and products applied to or integrated in the chip, the modules / units included therein may all be implemented in the form of hardware such as circuits, or at least some of the modules / units may be implemented in the form of software programs, which run on the processor integrated inside the chip, and the remaining (if any) modules / units may be implemented in the form of hardware such as circuits; for the devices and products applied to or integrated in the chip module, the modules / units included therein may all be implemented in the form of hardware such as circuits, and different modules / units may be located in the same component (such as a chip, circuit module, etc.) or in different components of the chip module, or at least some of the modules / units may be implemented in the form of software programs. The software programs run on the processor integrated inside the chip, and the remaining (if any) modules / units may be implemented in the form of hardware such as circuits. It is implemented in the form of a software program, which runs on a processor integrated inside the chip module, and the remaining (if any) modules / units can be implemented in hardware such as circuits; for various devices and products applied to or integrated in the terminal equipment, the various modules / units contained therein can be implemented in hardware such as circuits, and different modules / units can be located in the same component (for example, chip, circuit module, etc.) or in different components in the terminal equipment, or, at least some modules / units can be implemented in the form of a software program, which runs on a processor integrated inside the terminal equipment, and the remaining (if any) modules / units can be implemented in hardware such as circuits.

[0497] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above description is only the specific implementation method of the embodiments of the present application and is not intended to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A physical random access channel transmission method, characterized in that: include: The physical random access channel PRACH transmission is performed according to the first valid physical random access channel opportunity RO obtained according to the sub-band full-duplex SBFD configuration.

2. The method according to claim 1, characterized in that The first valid RO is in the uplink subband of the SBFD symbol.

3. The method according to claim 1 or 2, characterized in that: The first valid RO starts no earlier than a preset number of symbols after the non-SBFD downlink symbol is switched to the SBFD symbol.

4. The method according to claim 2, characterized in that: The first valid RO is in the uplink subband of the SBFD symbol, including: All resource blocks RB of the first valid RO are in the uplink subband of the SBFD symbol.

5. The method according to claim 2, characterized in that: The first valid RO is in the uplink subband of the SBFD symbol, including: A portion of RBs of the first valid RO is in an uplink subband of the SBFD flexible symbol, and the remaining portion of RBs is in a downlink subband of the SBFD flexible symbol.

6. The method according to claim 1, characterized in that The first valid RO is within at least a preset number of symbols after the SBFD symbol is switched to a non-SBFD flexible symbol; and / or, The first effective RO has the same frequency domain position as the uplink subband of the SBFD symbol.

7. The method according to claim 1, characterized in that The first effective RO is all frequency domain ROs at the same time domain position, and all frequency domain ROs are in the uplink subband of the SBFD symbol.

8. The method according to claim 1, characterized in that The first effective RO is a portion of the frequency domain ROs that are only located in the uplink subband of the SBFD symbol among all the frequency domain ROs at the same time domain position.

9. The method according to claim 1, characterized in that: Some symbols of the first valid RO are in uplink subbands of SBFD symbols, and the remaining symbols are in non-SBFD uplink symbols or non-SBFD flexible symbols.

10. The method according to claim 1, characterized in that The first valid RO and the second valid RO are jointly and uniformly mapped between the RO and the synchronization signal block SSB.

11. The method according to claim 1, characterized in that: The first valid RO and the second valid RO each independently perform mapping between RO and SSB.

12. The method according to claim 1, characterized in that The first valid RO and the second valid RO are configured using the same random access channel configuration information.

13. The method according to claim 1, characterized in that The first valid RO and the second valid RO are configured using different random access channel configuration information respectively.

14. The method according to claim 1, characterized in that If the SBFD flexible symbol where the first valid RO is located comes from a non-SBFD flexible symbol, the RO obtained by the SBFD configuration and the RO obtained by the non-SBFD configuration are configured using the same or different random access channel configuration information.

15. The method according to any one of claims 10 to 14, characterized in that The second valid RO is within the PRACH time slot and is within a non-SBFD uplink symbol or a non-SBFD flexible symbol; and the second valid RO starts no earlier than a preset number of symbols after the last non-SBFD downlink symbol, and / or starts no earlier than the preset number of symbols after the SSB symbol; or The second valid RO is within the PRACH time slot and is within an uplink symbol or a flexible symbol, and starts no earlier than a preset number of symbols after the last downlink symbol, and / or starts no earlier than the preset number of symbols after the SSB symbol.

16. A physical random access channel transmission device, characterized in that: include: The transmission unit is used to perform physical random access channel PRACH transmission according to the first valid physical random access channel opportunity RO obtained by the sub-band full-duplex SBFD configuration.

17. A terminal device comprising a processor, a memory and a computer program or instruction stored in the memory, characterized in that: The processor executes the computer program or instructions to implement the steps of the method according to any one of claims 1 to 15.

18. A network device comprising a processor, a memory and a computer program or instruction stored in the memory, characterized in that: The processor executes the computer program or instructions to implement the steps of the method according to any one of claims 1 to 15.

19. A chip comprising a processor and a communication interface, characterized in that: The processor executes the steps of the method according to any one of claims 1-15.

20. A computer-readable storage medium, characterized in that: The computer stores a computer program or an instruction, and when the computer program or the instruction is executed, the steps of the method according to any one of claims 1 to 15 are implemented.

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