Communication method and apparatus

Abstract

A communication method and apparatus. The method comprises: after receiving a reference signal from a network device in a first SBFD time unit in a first transmission direction, if a first condition is met, sending a random access request message to the network device in a second SBFD time unit, wherein the first condition may be used for determining whether the random access request message in the second SBFD time unit interferes with downlink signals of other terminal devices, for example, the first condition may be determined on the basis of at least one of the reference signal, the first transmission direction, and a second transmission direction associated with a first terminal device. By means of the method, before random access is initiated, whether the first condition is met is determined on the basis of the reference signal, the first transmission direction of the reference signal, and the second transmission direction associated with the first terminal device itself, such that interference to downlink transmission of other terminal devices by a random access request message in an SBFD time unit can be reduced.

Description

Communication method and apparatus

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese Patent Application No. 202410651210.0, filed on May 23, 2024, and entitled “A Communication Method and Apparatus”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of communication technology, and in particular, to a communication method and apparatus. BACKGROUND

[0004] With the rapid development of the new radio (NR) of the fifth generation (5G) mobile communication technology, a variety of communication demands have emerged. To meet the demands of emerging services, a subband full duplex (SBFD) scheme is proposed to improve the uplink coverage of a time division duplex (TDD) system. Subband full duplex refers to a technology in which a network device can transmit uplink signals and receive downlink signals through different subbands in the same carrier, that is, it can receive signals and transmit signals on one time slot or one orthogonal frequency division multiplexing (OFDM) symbol.

[0005] A user equipment (UE) supporting SBFD can initiate a random access procedure on an SBFD symbol / SBFD time slot, including a message 1 or message A transmission process. However, transmitting a message 1 or a message on an SBFD symbol / SBFD time slot can cause cross link interference (CLI), that is, UE-UE interference, to downlink transmission in a downlink subband of a cell or a neighboring cell, resulting in poor downlink transmission performance of the SBFD symbol / SBFD time slot, especially for users in poor coverage areas such as cell edges. SUMMARY

[0006] The present application provides a communication method and apparatus to reduce signal interference between terminal devices in a random access procedure.

[0007] In a first aspect, the present application provides a communication method, the execution subject of the method is a terminal device or a module or chip in the terminal device, and the terminal device is taken as an example for description. The method comprises: receiving a reference signal from a network device in a first sub-band full duplex (SBFD) time unit in a first transmission direction; and when a first condition is met, sending a random access request message to the network device in a second SBFD time unit, wherein the first condition is determined according to at least one of the reference signal, the first transmission direction and a second transmission direction associated with the first terminal device.

[0008] Through the method, before initiating random access, whether the first condition is met is determined according to the reference signal, the first transmission direction of the reference signal and the second transmission direction associated with the terminal device, and the random access request message sent in the second SBFD time unit is sent when the first condition is met, which can reduce the interference of the random access request message sent in the second SBFD time unit to the downlink transmission of other terminal devices, improve the downlink transmission performance of other terminal devices, especially terminal devices in poor coverage areas such as cell edges, control the cross-link interference between terminal devices, enhance the access capability of the terminal device and improve the system efficiency.

[0009] In a possible implementation, the first condition comprises at least one of the following:

[0010] The first transmission direction is the same as the second transmission direction, and a reference signal received power (RSRP) of the reference signal is greater than a threshold value;

[0011] The first transmission direction is different from the second transmission direction, and the RSRP of the reference signal is less than or equal to the threshold value;

[0012] A deviation between the first transmission direction and the second transmission direction is greater than a threshold.

[0013] In the above scheme, any one of the first conditions is met, which can ensure that the interference of the random access request message to the downlink transmission of other terminal devices is minimized or has no interference, thereby realizing the enhancement of the access capability of the terminal device and improving the system efficiency.

[0014] In a possible implementation, the reference signal and the random access request message are separated by a first time length in the time domain, and the first time length is greater than or equal to a time delay required by the first terminal device for uplink-downlink conversion.

[0015] In the above scheme, by separating the reference signal and the random access request message by the first time length in the time domain, it can be avoided that the terminal device cannot send the random access request message before the uplink-downlink conversion is completed, and the resource utilization rate is improved.

[0016] In a possible implementation, the method further includes: receiving reference signal resource information from the network device, the reference signal resource information indicating at least one resource used for transmitting the reference signal; and one of the resources being associated with at least one transmission direction.

[0017] In a possible implementation, the method further includes: detecting the reference signal in a resource associated with the second transmission direction in the at least one resource.

[0018] In the above solution, the terminal device only needs to detect the reference signal in the resource associated with the second transmission direction, thereby reducing device power consumption and prolonging working time.

[0019] In a possible implementation, the second transmission direction is a transmission direction of an SSB selected by the first terminal device.

[0020] In a second aspect, the present application provides a communication method, and an execution subject of the method is a network device or a module or chip in the network device. Here, the network device is taken as an example for description. The method includes: transmitting a downlink signal to a second terminal device in a second downlink resource in a first transmission direction; transmitting a reference signal in the first transmission direction in a first sub-band full duplex (SBFD) time unit; and receiving a random access request message from a first terminal device in a second SBFD time unit; the random access request message satisfies a first condition, and the first condition is determined according to at least one of the reference signal, the first transmission direction, and a second transmission direction associated with the first terminal device.

[0021] In a possible implementation, the reference signal and the random access request message are separated by a first time length in a time domain, and the first time length is greater than or equal to a time delay required by the first terminal device for uplink-downlink conversion.

[0022] In a third aspect, the present application provides a communication method, and an execution subject of the method is a network device or a module or chip in the network device. Here, the network device is taken as an example for description. The method includes: determining first indication information when a first condition is satisfied; the first indication information is used to indicate that a random access resource is allowed to be used in an SBFD time unit; the first condition is determined according to at least one of a measurement value from a first terminal device and a data transmission state of the first terminal device; the data transmission state of the first terminal device indicates whether a downlink signal is scheduled for the first terminal device in a first SBFD time unit; and the first indication information is transmitted to the second terminal device.

[0023] By the method provided in the application, the first indication information explicitly indicates that the second terminal device is allowed to use the random access resource in the SBFD time unit, so that the second terminal device determines whether to send a random access request message in the SBFD time unit according to the first indication information. Since the network device can schedule data transmission of all terminal devices in its cell, the network device sends the first indication information according to the data transmission state of the first terminal device, which can reduce the interference of the random access request message sent by the terminal device in the SBFD time unit to the downlink transmission of other terminal devices, control the cross-link interference between terminal devices, realize the access capability enhancement of the terminal device, and improve the system efficiency.

[0024] In a possible implementation, the first condition includes at least one of the following:

[0025] The measurement value is not received from the first terminal device; or the measurement value is less than a first threshold value;

[0026] The measurement value is greater than or equal to a first threshold value, and no downlink signal is scheduled for the first terminal device in the first SBFD time unit.

[0027] In a possible implementation, the measurement object of the measurement value is a reference signal, and the reference signal is sent by the second terminal device.

[0028] In a possible implementation, the method further includes: sending, to the second terminal device, reference signal resource configuration information, the reference signal resource configuration information indicating a reference signal resource used for transmitting the reference signal.

[0029] In a possible implementation, the method further includes: sending, to the second terminal device, random access resource configuration information, the random access resource configuration information indicating the random access resource.

[0030] In a possible implementation, the method further includes: when a second condition is met, sending, to the second terminal device, second indication information; the second indication information is used to indicate that the random access resource is not allowed to be used in the SBFD time unit; and the second condition includes at least one of the following: the measurement value is greater than or equal to a first threshold value; and a downlink signal is scheduled for the first terminal device in the first SBFD time unit.

[0031] In a fourth aspect, the present application provides a communication method, the execution subject of the method is a terminal device or a module or chip in the terminal device, and the terminal device is taken as an example for description. The method comprises: receiving first indication information from a network device; the first indication information is used for indicating that random access resources are allowed to be used in a sub-band full duplex (SBFD) time unit; and determining, according to the first indication information, that a random access request message is allowed to be sent to the network device through the random access resources in the SBFD time unit.

[0032] In a possible implementation, the first condition comprises at least one of the following:

[0033] The measurement value is not received from the first terminal device; or the measurement value is less than a first threshold value;

[0034] The measurement value is greater than or equal to the first threshold value, and no downlink signal is scheduled for the first terminal device in the first SBFD time unit.

[0035] In a possible implementation, the measurement object of the measurement value is a reference signal, and the reference signal is sent by the second terminal device.

[0036] In a possible implementation, the method further comprises: receiving second indication information from a network device; and the second indication information is used for indicating that random access resources are not allowed to be used in the SBFD time unit.

[0037] In a fifth aspect, the present application provides a communication method, the execution subject of the method is a network device or a module or chip in the network device, and the network device is taken as an example for description. The method comprises: sending random access resource configuration information, the random access resource configuration information indicating random access resources; and sending first information to a terminal device, the first information indicating that M random access channel occasions corresponding to a first sub-band full duplex (SBFD) time unit in the random access resources are allowed to be used, and M is an integer greater than 0.

[0038] In a possible implementation, no downlink signal is transmitted in the first SBFD time unit.

[0039] In a possible implementation, the first information is transmitted in a first transmission direction; each of the M random access channel occasions is associated with the first transmission direction, and no downlink signal is transmitted in the first transmission direction in the first SBFD time unit.

[0040] In a possible implementation, the first information is transmitted in multiple transmission directions; each of the M random access channel occasions is associated with the multiple transmission directions includes a first transmission direction, and no downlink signal is transmitted in the first transmission direction in the first SBFD time unit.

[0041] In a possible implementation, the first information is group downlink control information (DCI) or a medium access control (MAC) control element (CE).

[0042] In a possible implementation, the method further includes: transmitting resource configuration information, where the resource configuration information indicates resources used for transmitting the first information.

[0043] In a sixth aspect, the present application provides a communication method, and an execution subject of the method is a terminal device or a module or a chip in the terminal device, and the terminal device is taken as an example for description. The method includes: receiving random access resource configuration information from a network device, where the random access resource configuration information indicates random access resources; and the at least one random access resource is located in at least one SBFD time unit; and receiving first information from the network device, where the first information indicates that M random access channel occasions corresponding to a first sub-band full duplex (SBFD) time unit in the random access resources are allowed to be used, and M is an integer greater than 0.

[0044] By the method provided in the present application, the network device explicitly indicates, through the first information, that the terminal device is allowed to use the random access resources in the first SBFD time unit, so that the terminal device determines, according to the first information, that the random access request message can be sent in the first SBFD time unit. Since data transmission of all terminal devices in the network device is scheduled by the network device, the first information is sent by the network device, so that interference of the random access request message sent in the SBFD time unit to downlink transmission of other terminal devices can be reduced, cross-link interference between terminal devices can be controlled, terminal device access capability can be enhanced, and system efficiency can be improved.

[0045] In a possible implementation, the method further includes: sending, to the network device, a random access request message through a first random access channel occasion in the M random access channel occasions.

[0046] In a possible implementation, the first information is transmitted in a first transmission direction; and each of the M random access channel occasions is associated with the first transmission direction.

[0047] In a possible implementation, the first information is transmitted in multiple transmission directions; each of the M random access channel occasions is associated with one or more of the multiple transmission directions.

[0048] In a possible implementation, the first information is group downlink control information (DCI) or a medium access control (MAC) control element (CE).

[0049] In a possible implementation, the method further includes: receiving resource configuration information from the network device, the resource configuration information indicating resources for transmitting the first information.

[0050] In a seventh aspect, the present disclosure provides a communication apparatus, which can implement any of the methods provided in the first aspect to the sixth aspect. The communication apparatus can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more function modules corresponding to the above functions.

[0051] In a possible implementation, the communication apparatus includes a processor configured to support the communication apparatus to perform the corresponding functions of the network device or the terminal device or the core network device in the above methods. The communication apparatus can further include a memory coupled to the processor, which stores the necessary program instructions and data of the communication apparatus. Optionally, the communication apparatus further includes an interface circuit for supporting the communication between the communication apparatus and other devices such as terminal devices.

[0052] In a possible implementation, the communication apparatus includes corresponding function modules for implementing the steps in the above methods respectively. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0053] In a possible implementation, the structure of the communication apparatus includes processing units and communication units, which can perform the corresponding functions in the above method examples, and the details are described in the methods provided in the first aspect to the sixth aspect, which will not be repeated here.

[0054] In an eighth aspect, a communication apparatus is provided, which includes a processor and an interface circuit. The interface circuit is configured to receive signals from other communication apparatuses outside the communication apparatus and transmit the signals to the processor, or send signals from the processor to other communication apparatuses outside the communication apparatus. The processor implements the function modules of the methods in any possible implementation of any of the first aspect to the sixth aspect by means of logic circuit or executing computer programs or instructions. Optionally, the communication apparatus further includes a memory for storing computer programs or instructions.

[0055] In a ninth aspect, a computer readable storage medium is provided, which stores a computer program or instructions, when the computer program or instructions are executed by a processor, or when the computer program or instructions are run on a computer, the computer is caused to implement the method in any possible implementation of any of the preceding first aspect to the sixth aspect.

[0056] In a tenth aspect, a computer program product is provided, which stores instructions, when the computer program product is read and executed by a computer, the method in any possible implementation of any of the preceding first aspect to the sixth aspect is implemented.

[0057] In an eleventh aspect, a circuit is provided, which is used to execute the method in any possible implementation of any of the preceding first aspect to the sixth aspect, the circuit can include a chip circuit. Optionally, the circuit can also be coupled with a memory.

[0058] In a twelfth aspect, a chip is provided, which includes a processor, when the processor executes a computer program or instructions, the method in any possible implementation of any of the preceding first aspect to the sixth aspect is implemented. Optionally, the chip can also include a memory, the chip can be composed of a chip, and can also include a chip and other discrete devices.

[0059] In a thirteenth aspect, a communication apparatus is provided, which includes a processor, the processor implements the method in any possible implementation of any of the preceding first aspect to the sixth aspect by logic circuit or executing a computer program or instructions. Or the processor is used to execute the computer program or instructions stored in the memory, and implement the method in any possible implementation of any of the preceding first aspect to the sixth aspect.

[0060] In a fourteenth aspect, a communication apparatus is provided, which includes units or modules for executing the method in any possible implementation of any of the preceding first aspect to the sixth aspect.

[0061] In a fifteenth aspect, an embodiment of the present application further provides a communication system. The communication system comprises: a terminal device for implementing the method in the foregoing first aspect and any possible implementation manner of the first aspect; a network device for implementing the method in the foregoing second aspect and any possible implementation manner of the second aspect. Or the communication system comprises: a terminal device for implementing the method in the foregoing fourth aspect and any possible implementation manner of the fourth aspect; a network device for implementing the method in the foregoing third aspect and any possible implementation manner of the third aspect. Or the communication system comprises: a network device for implementing the method in the foregoing fifth aspect and any possible implementation manner of the fifth aspect; a terminal device for implementing the method in the foregoing sixth aspect and any possible implementation manner of the sixth aspect. BRIEF DESCRIPTION OF DRAWINGS

[0062] FIG. 1 is a time slot diagram provided by an embodiment of the present application;

[0063] FIG. 2 is an SBFD diagram provided by an embodiment of the present application;

[0064] FIG. 3 is a random access process diagram provided by an embodiment of the present application;

[0065] FIG. 4 is a PRACH resource diagram provided by an embodiment of the present application;

[0066] FIG. 5 is a PRACH cycle diagram provided by an embodiment of the present application;

[0067] FIG. 6 is a starting position diagram of PRACH in the frequency domain provided by an embodiment of the present application;

[0068] FIG. 7 is an SSB and RO mapping diagram provided by an embodiment of the present application;

[0069] FIG. 8 is an SSB and RO mapping diagram provided by an embodiment of the present application;

[0070] FIG. 9 is a network architecture diagram suitable for an embodiment of the present application;

[0071] FIG. 10 is a network device architecture diagram provided by an embodiment of the present application;

[0072] FIG. 11 is a network device architecture diagram provided by an embodiment of the present application;

[0073] FIG. 12 is a communication method flow diagram provided by an embodiment of the present application;

[0074] FIG. 13A is a transmission direction diagram provided by an embodiment of the present application;

[0075] FIG. 13B is an application scenario diagram provided by an embodiment of the present application;

[0076] FIG. 14 is a first time length diagram provided by an embodiment of the present application;

[0077] FIG. 15 is a communication method flow diagram provided by an embodiment of the present application;

[0078] FIG. 16 is a communication method flow diagram provided by an embodiment of the present application;

[0079] FIG. 17 is a RO set diagram provided by an embodiment of the present application;

[0080] FIG. 18 is a communication device structure diagram provided by an embodiment of the present application;

[0081] FIG. 19 is a communication device structure diagram provided by an embodiment of the present application;

[0082] FIG. 20 is a communication device structure diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0083] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The terms "first", "second" and corresponding terms of reference in the present application are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, which is only a distinguishing way used in the description of the embodiments of the present application to describe the objects with the same attributes. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that the process, method, system, product or device containing a series of units does not necessarily limit to those units, but can include other units not clearly listed or inherent to these processes, methods, products or devices. The method and device provided by the embodiments of the present application are based on the same or similar technical concepts, and since the principles of the device and method for solving problems are similar, the implementation of the device and method can be mutually referred to, and the repeated parts will not be described.

[0084] The method provided by the embodiments of the present application can be applied to various mobile communication systems, for example, can be an internet of things (IoT), narrow band internet of things (NB-IoT), can be a 4th generation (4G) communication system (for example, long term evolution (LTE)), can be a 5th generation (5G) communication system (for example, 5G new radio (NR)), can be a mixed architecture of LTE and NR, can be a new communication system in future communication development, and the like. The communication system can also include a machine to machine (M2M) network, machine type communication (MTC), or other networks.

[0085] In the following, first, some terms in the embodiments of the present application are explained and described, so as to facilitate understanding by those skilled in the art.

[0086] (1) Time division duplex (TDD), uplink signals and downlink signals can be transmitted on the same time slot or OFDM symbol, as shown in (a) of FIG. 1, on slot 0, downlink (DL) bandwidth part (BWP) (i.e., DL BWP) can be used to receive downlink signals, and uplink (UL) BWP (i.e., UL BWP) can be used to transmit uplink signals, wherein the DL BWP and the UL BWP are located in different carriers, that is, they are separated in the frequency domain. In the figure, D represents a downlink time slot, U represents an uplink time slot, and F represents a flexible time slot.

[0087] (2) Frequency division duplex (FDD), the center frequency points of the DL BWP and the UL BWP are the same, and only uplink signals or downlink signals can be transmitted at the same time. As shown in (b) of FIG. 1, slot 0 is a DL time slot, and only downlink signals can be received on slot 0. Slot 4 is a UL time slot, and only uplink signals can be transmitted on slot 4. Slot 3 is a flexible time slot, and uplink signals or downlink signals can be transmitted on slot 3, but uplink signals and downlink signals cannot be transmitted at the same time.

[0088] (3) SBFD, refers to a scheme in which a TDD symbol or time slot is configured to simultaneously transmit uplink signals and receive downlink signals. In the SBFD scheme, a component carrier (CC) is divided into multiple non-overlapping subbands, and the transmission directions of different subbands can be different. For example, the time-frequency division of two typical SBFD schemes is shown in FIG. 2, where the horizontal direction represents the time domain, and the vertical direction represents the frequency domain. DL represents a downlink resource for downlink data or control information transmission, UL represents an uplink resource for uplink data or control information transmission, and a time period with both DL and UL is referred to as an SBFD time slot or SBFD symbol. A time period including only uplink resources is referred to as an uplink time slot or uplink symbol. In FIG. 2(a), time slot 1, time slot 2, and time slot 3 are SBFD time slots, and in the SBFD time slots, the frequency domain resources in the middle of the carrier are uplink resources, and the frequency domain resources at both ends of the carrier are downlink resources. In FIG. 2(b), time slot 1, time slot 2, and time slot 3 are SBFD time slots, and in the SBFD time slots, the frequency domain resources in the upper half of the carrier are downlink resources, and the frequency domain resources in the lower half of the carrier are uplink resources.

[0089] (4) Beam: A beam is a kind of communication resource. A beam can be a wide beam, or a narrow beam, or other types of beams. The technology for forming a beam can be beamforming technology or other technical means. The beamforming technology can be digital beamforming technology, analog beamforming technology, or hybrid digital / analog beamforming technology. Different beams can be considered as different resources. The same information or different information can be transmitted through different beams. Alternatively, multiple beams with the same or similar communication characteristics can be considered as one beam. One beam can include one or more antenna ports for transmitting data channels, control channels, and sounding signals, etc. For example, a transmit beam can refer to the distribution of signal strength in different directions in space after the signal is transmitted by an antenna, and a receive beam can refer to the distribution of signal strength in different directions in space of the wireless signal received by an antenna. It can be understood that one or more antenna ports forming a beam can also be regarded as an antenna port set. The beam can be embodied in the protocol as a spatial filter or a spatial parameter (such as a spatial reception parameter and a spatial transmission parameter).

[0090] The beam can be embodied in the NR protocol as a spatial domain filter, or a spatial filter, or a spatial parameter (such as a spatial reception parameter and a spatial transmission parameter).

[0091] (5) Random access procedure.

[0092] In the LTE system and the NR system, a terminal device completes uplink time synchronization with a base station through a random access (RA) procedure, and establishes a radio resource control (RRC) connection with the base station through the random access procedure. After the terminal device and the base station establish the RRC connection, uplink and downlink service data transmission can be performed.

[0093] Taking the NR system as an example, in the NR system, the random access procedure type includes two types: Type-1 (Type-1) RA procedure and Type-2 (Type-2) RA procedure. The Type-1 RA procedure is also referred to as a four-step RA (4-step RA) procedure, and the Type-2 RA procedure is also referred to as a two-step RA (2-Step RA) procedure.

[0094] As shown in FIG. 3, it is a Type-1 RA procedure provided by the present application.

[0095] In step 301, a terminal device sends a preamble to a network device through a physical random access channel (PRACH).

[0096] The preamble can also be referred to as a preamble sequence or a random access preamble or a random access preamble sequence, and is a message 1 (msg1) of a four-step random access procedure.

[0097] The terminal device randomly selects a certain random access channel occasion (RO) in the RO associated with the SSB index for sending the preamble according to the system message sent by the network device and the selected index of the synchronization signal / physical broadcast channel block (SS / PBCH block or SSB). The RO can be understood as a time-frequency resource used by the terminal device for random access. The RO can also be referred to as a physical random access channel occasion or a RACH occasion or an RA occasion, etc. The network device preconfigures the association relationship between the RO and the SSB index. After the time-frequency resource (i.e., the RO) is determined, the terminal device selects a preamble in the selected RO for sending. A maximum of 64 preambles can be transmitted simultaneously on one RO, and the terminal device selects one of the 64 preambles.

[0098] At step 302, the network device sends a random access response (RAR) to the terminal device.

[0099] The RAR is also referred to as message 2 (msg2) of the random access procedure, and the RAR can include scheduling information of message 3 (msg3) and the like, i.e., an uplink grant (UL grant).

[0100] The terminal device starts a random access response window after sending the preamble, and listens to msg2 in the window. If the terminal device successfully detects its own RAR, the random access is successful, and the terminal device continues to send msg3 according to the indication of the RAR.

[0101] At step 303, the terminal device sends msg3 to the network device.

[0102] The terminal device sends msg3 on the resource indicated by the RAR uplink grant, and msg3 is carried by a physical uplink shared channel (PUSCH).

[0103] In order to distinguish different terminal devices, the terminal device carries an identifier that can uniquely identify the terminal device in msg3.

[0104] At step 304, the network device sends a contention resolution message to the terminal device that successfully accesses.

[0105] The contention resolution message can also be referred to as message 4 (msg4). When multiple terminal devices access at the same time, which terminal device successfully accesses can be determined according to msg4.

[0106] The Type-2 RA procedure is based on the Type-1 RA, and the first four steps are combined into two steps. In the Type-2 RA procedure, the terminal device sends msgA, which can be understood as a message obtained by combining msg1 and msg3 in the Type-1 RA. After receiving msgA, the network device sends msgB, which can be understood as a message obtained by combining msg2 and msg4 in the Type-1 RA.

[0107] The terminal device transmits a preamble on an RO, which can be considered as a block of time-frequency resources for transmitting a preamble, multiple preamble code division multiplexing transmissions can be supported on one RO, and multiple ROs are supported by one NR cell. Unlike LTE, NR introduces multi-beam operation, so the random access procedure of NR is based on beam transmission. For terminal devices in the initial access stage, transmission is mainly based on SSB beams, and for terminal devices in the connected state, transmission can also be based on channel state information reference signal (CSI-RS) beams. NR can support the base station transmitting SSBs in multiple beam directions, and the terminal device can select one SSB and use the SSB beam to transmit PRACH. As for how the terminal device selects the SSB to transmit PRACH, if the base station does not configure an RSRP threshold value, the terminal device can select an SSB to transmit PRACH at will, otherwise, it selects an SSB to transmit PRACH at will among the SSBs that exceed the RSRP threshold value (if any).

[0108] In the LTE system, the PRACH in the UL slot can be configured by the RACH configuration generic (RACH-ConfigGeneric) information element, and the terminal device can use the PRACH in the UL slot for random access. For example, as shown in FIG. 4, the horizontal direction represents the time domain, and the vertical direction represents the frequency domain, where the dashed box in the UL slot represents a block of PRACH resources specified by RACH-ConfigGeneric. Specifically, according to the parameter prach-ConfigurationIndex in the high-level information element RACH-ConfigGeneric, the period, frame number, subframe number, slot number, and time domain position information of the RO in the time domain of the PRACH can be obtained.

[0109] For example, as shown in FIG. 5, the three black blocks on the uppermost layer are the frames in which the PRACH is located, and the time domain distance between the two black blocks is the PRACH period. The middle layer is the subframe composition of the PRACH frame, where each black block is a subframe in which the PRACH is located. The lowermost layer shows the slot structure of the PRACH subframe, where the first block filled with patterns is the PRACH slot, which contains six small blocks filled with patterns, and each small block corresponds to one RO, i.e., contains six ROs.

[0110] The starting position of PRACH in the frequency domain and the frequency division multiplexing (FDM) number of PRACH can be obtained according to the parameter message 1 frequency start (msg1-FrequencyStart) and message 1 frequency division multiplexing (FDM) (msg1-FDM) in the high-layer information element RACH-ConfigGeneric, which also determines the frequency domain position of PRACH. For example, as shown in FIG. 6, where the vertical direction represents the frequency domain, and each block is 1 RO, the ROs are arranged from the frequency domain position specified by msg1-FrequencyStart, starting with 4 ROs.

[0111] As described above, in the msg1 transmission process, the terminal device selects an RO according to the index of the SSB to transmit the preamble sequence. Therefore, in the existing NR standard, in addition to specifying the PRACH position, the mapping relationship of RO-SSB (one SSB index can be associated with multiple ROs, or multiple SSB indexes are associated with one RO) also needs to be specified. Specifically, the network device can configure the mapping relationship of N SSBs to 1 RO through the high-layer parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB. When N is less than 1, 1 SSB is associated with 1 / N ROs; when N is greater than 1, N SSBs are associated with 1 RO (1 SSB is associated with 1 / N ROs). For example, as shown in FIG. 7, when N = 1 / 2, one SSB is associated with 2 ROs, and when N = 2, 1 RO is associated with 2 SSBs. Thus, in the case where one SSB index is associated with multiple ROs, the terminal device selects one of the multiple ROs and selects the preamble sequence transmitted on the RO. After determining the association relationship between the RO and the SSB, RO-SSB mapping can be started, and the order is frequency domain first, time domain second, same slot first, same frame second, and different frame last.

[0112] For example, as shown in FIG. 8, where the horizontal direction represents the time domain, and the vertical direction represents the frequency domain, the SSB set used by the base station is {SSB i , SSB i+1 , SSB i+2 , SSB i+3}, the frequency division multiplexing number is 4, and N = 1 / 4, 1 SSB is associated with 4 ROs, and the RO set is denoted as {RO1, RO2, RO3, RO4}, and 16 ROs complete a complete RO-SSB mapping period. The specific RO-SSB mapping order is arranged from the frequency domain corresponding to a certain RO time domain position, that is, SSB i The corresponding RO1-RO4 occupies the first RO time domain position of the starting PRACH slot of the same frame corresponding to the frequency domain of 4 RO positions, SSB i+1Corresponding RO1-RO4 occupies the second RO time domain position of the starting PRACH slot corresponding to 4 RO positions in the frequency domain, SSB i+1 Corresponding RO1-RO4 occupies the second RO time domain position of the starting PRACH slot corresponding to 4 RO positions in the frequency domain, SSB i+2 Corresponding RO1-RO4 occupies the first RO time domain position of the second PRACH slot in the same frame corresponding to 4 RO positions in the frequency domain, SSB i+3 Corresponding RO1-RO4 occupies the second RO time domain position of the second PRACH slot in the same frame corresponding to 4 RO positions in the frequency domain.

[0113] Figure 9 is a schematic diagram of the architecture of a communication system to which embodiments of the present application can be applied. As shown in Figure 9, the communication system includes an access network 100 and a core network 200. Optionally, the communication system can also include the Internet 300. The access network 100 can include at least one radio access network (RAN) node, such as 110a and 110b in Figure 9, and at least one terminal device, such as 120a-120j in Figure 9. Among them, 110a is a base station, 110b is a micro station, 120a, 120e, 120f and 120j are mobile phones, 120b is a car, 120c is a fuel dispenser, 120d is a home access point (HAP) arranged indoors or outdoors, 120g is a notebook computer, 120h is a printer, and 120i is a drone. Among them, the same terminal device or network device can provide different functions in different application scenarios. For example, the mobile phones in the figure are 120a, 120e, 120f and 120j, the mobile phone 120a can access the base station 110a, connect the car 120b, communicate directly with the mobile phone 120e and access the HAP, the car 120b can access the HAP and communicate directly with the mobile phone 120a, the mobile phone 120f can access the micro station 110b, connect the notebook computer 120g, and connect the printer 120h, and the mobile phone 120j can control the drone 120i.

[0114] The access network 100 can be a 3rd generation partnership project (3GPP) related cellular system. The RAN 100 can also be an open RAN (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system, and can also be a communication system that combines two or more of the above systems.

[0115] In the embodiments of the present application, the network device can be a device in a wireless network, and the network device can also be referred to as a network apparatus or a radio access network device or an access network device. For example, the network device can be a radio access network (RAN) node that accesses a terminal device to a wireless network, and can also be referred to as an access network device. The network device includes but is not limited to: a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a 5th generation (5G) mobile communication system, an access network device in an open radio access network (O-RAN), a base station in a future mobile communication system, or an access node in a wireless fidelity (WiFi) system, etc.; or can be a module or unit that completes part of the function of the base station, for example, can be a centralized unit (CU), a distributed unit (DU), a centralized unit control plane (CU-CP) module, or a centralized unit user plane (CU-UP) module. The access network device can be a macro base station, or a micro base station or an indoor station, or a relay node or a donor node, etc. The specific technology and specific device form of the network device adopted in the present application are not limited.

[0116] As shown in FIG. 10 and FIG. 11, in some implementations, a network device can include a centralized unit (CU) and a distributed unit (DU). The CU and the DU can be separately arranged, or can also be included in the same network element, such as a baseband unit (BBU). The CU can also be divided into a control plane (CU-CP) and a user plane (CU-UP). Among them, the CU-CP is responsible for the control plane function, mainly including the radio resource control (RRC) and the packet data convergence protocol (PDCP) corresponding to the control plane (i.e. PDCP-C). The CU-UP is responsible for the user plane function, mainly including the service data adaptation protocol (SDAP) and the PDCP corresponding to the user plane (i.e. PDCP-U). The CU-CP is connected with the core network through the NG interface and the gNB, and is connected with the DU through the F1 interface control plane (i.e. F1-C). The CU-UP is connected with the DU through the F1 interface user plane (i.e. F1-U). Of course, there is also a possible implementation that the PDCP-C is also in the CU-UP.

[0117] The network device can also include an active antenna unit (AAU). The CU implements part of the function of the gNB, and the DU implements part of the function of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implements the function of the RRC layer. The DU is responsible for processing the physical layer protocol and real-time services, and implements the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer.

[0118] The terminal device involved in the embodiments of the present application can be a wireless terminal device capable of receiving network device scheduling and indication information. The terminal device can also be referred to as a terminal device, a user equipment (UE), a terminal, a mobile station (MS), a mobile terminal (MT), etc. The terminal device can be a device including a wireless communication function (providing voice / data connectivity to users). For example, a handheld device with wireless connection function, or a vehicle-mounted device, a vehicle-mounted module, etc. At present, some examples of terminal devices are: a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in vehicle networking, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, or a wireless terminal in smart home, a device-to-device (D2D) terminal device, a vehicle-to-everything (V2X) communication terminal device, a smart vehicle, a telematics box (T-box), a machine-to-machine / machine-type communications (M2M / MTC) terminal device, an internet of things (IoT) terminal device, etc. For example, the terminal device can be a vehicle-mounted device, a whole vehicle device, a vehicle-mounted module, a vehicle, an on board unit (OBU), a roadside unit (RSU), a T-box, a chip or a system on chip (SOC), etc. The above-mentioned chip or SOC can be installed in a vehicle, an OBU, an RSU or a T-box. The wireless terminal in industrial control can be a camera, a robot, etc. The wireless terminal in smart home can be a television, an air conditioner, a sweeper, a sound box, a set-top box, etc.The terminal device can also be a V2X device, for example, a smart car, a digital car, an unmanned car, a driverless car, a pilotless car, an automobile, a self-driving car, an autonomous car, a pure EV, a Battery EV, a hybrid electric vehicle (HEV), a range extended EV (REEV), a plug-in HEV (PHEV), a new energy vehicle, a road site unit (RSU). The terminal device can also be a device in device-to-device (D2D) communication, for example, an electricity meter, a water meter, and the like. In addition, in the embodiments of the present application, the terminal device can also be a terminal device in an IoT system. IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the interconnection of man-machine and the intelligent network of object-object.

[0119] The network architecture and service scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the evolution of network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0120] It can be understood that the present application does not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application. In the following various embodiments, the method executed by the terminal device can also be applied to the module or chip in the terminal device, and the method executed by the network device can also be applied to the module or chip in the network device, as long as the program recording the code of the method provided by the embodiments of the present application can be run to communicate according to the method provided by the embodiments of the present application. Hereinafter, the interaction between the terminal device and the network device is taken as an example for description.

[0121] In the following various embodiments of the present application, the terminal device and the network device are SBFD-enabled devices unless otherwise specified.

[0122] As shown in FIG. 12, a communication method flowchart provided by the embodiments of the present application is shown. The method includes:

[0123] Step 1201: The network device sends random access resource configuration information.

[0124] Correspondingly, the first terminal device receives the random access resource configuration information from the network device.

[0125] The random access resource configuration information can also be referred to as PRACH resource configuration and the like. The random access resource configuration information can indicate a random access resource, which can also be referred to as a PRACH resource. The random access resource includes a plurality of ROs. One RO can be considered as a block of time-frequency resource in the random access resource. The RO can be used to transmit a random access request message, for example, to transmit a preamble.

[0126] In an implementation manner, the random access resource configuration information can indicate at least one of the following: a starting position of the random access resource in the frequency domain, for example, which can be referred to in the description related to FIG. 6; a frequency division multiplexing number of the random access resource, for example, which can be referred to in the description related to FIG. 6; time domain information of the random access resource, for example, time domain information such as a period of time domain distribution of the random access resource, a frame number, a subframe number, a time slot number, and a number of ROs in a time slot, for example, which can be referred to in the description related to FIG. 5. The above is only an example, and the random access resource configuration information can also indicate other information of the random access resource, which is not limited in the present application.

[0127] In the present application, the random access resource indicated by the random access resource configuration information can be located in an SBFD time unit in the time domain, that is, the RO included in the random access resource can occupy the SBFD time unit in the time domain. The SBFD time unit can refer to an SBFD time slot or an SBFD symbol, and the like.

[0128] The network device can also configure the mapping relationship between the RO in the random access resource and the SSB through a high-layer parameter, for example, the high-layer parameter can be ssb-perRACH-OccasionAndCB-PreamblesPerSSB. One SSB index can be associated with a plurality of ROs, or a plurality of SSB indexes can be associated with one RO. One SSB is associated with one or more transmission directions (that is, beam directions). According to the mapping relationship between the RO and the SSB, the transmission direction associated with the RO can be determined, that is, the beam direction associated with the RO can be determined.

[0129] In the present application, the transmission direction can also be referred to as a beam direction or a spatial domain beam direction or a beam main lobe direction or a beam and the like.

[0130] In this application, the network device can send random access resource configuration information in a DL subband. The random access resource indicated by the random access resource configuration information can be located in an UL subband. The UL subband and the DL subband can belong to the same carrier; in one SBFD time unit, the resources of the UL subband and the resources of the DL subband can be included.

[0131] In an implementation manner, the network device can send the random access resource configuration information through a system information block (SIB). For example, the SIB is SIB1, and the random access resource configuration information is RACH-ConfigCommon in SIB1. Alternatively, if the SIB is SIB1, a different information element different from RACH-ConfigCommon can be reconfigured, that is, other information elements in SIB1 or new information elements in SIB1 are used to carry the random access resource configuration information.

[0132] In another implementation manner, the network device can send the random access resource configuration information through dedicated signaling. For example, when considering that the RRC connected terminal device can perform PRACH on the UL subband, the network device can use dedicated signaling to send the random access resource configuration information on the UL subband to the terminal device in the RRC connected state.

[0133] Step 1201 is an optional step, and the random access resource configuration information can also be configured through other manners, which is not limited in this application.

[0134] Step 1202: The network device sends reference signal resource information.

[0135] Correspondingly, the first terminal device receives the reference signal resource information from the network device.

[0136] The reference signal resource information indicates at least one resource for transmitting a reference signal, and one resource is associated with at least one transmission direction. The at least one resource indicated by the reference signal resource information can be located in an UL subband, and the at least one resource can be used by the terminal device to measure the use of the UL subband. The specific implementation manner of the reference signal is not limited. For example, the reference signal can be a demodulation reference signal (DMRS), a physical downlink shared channel (PDSCH) signal, or other signals.

[0137] In an implementation manner, the reference signal resource information can indicate the time domain position, the frequency domain position, and the associated transmission direction of each resource in the at least one resource.

[0138] In this application, one transmission direction can correspond to one index, and the reference signal resource information can indicate a transmission direction of a resource through the index. One resource can be associated with one transmission direction, which can refer to the transmission direction of the signal transmitted in the resource, and the transmission direction associated with the resource.

[0139] In an implementation manner, the transmission direction associated with each resource in the at least one resource can be an SSB direction or an SSB transmission direction. The network device can send SSBs in different directions using multiple beams, and one SSB direction or SSB transmission direction can refer to the beam direction used to send the SSB. At this time, the index corresponding to one transmission direction can be an SSB index.

[0140] The network device can send the reference signal in one resource of the at least one resource in the transmission direction (for example, the SSB direction) associated with the resource. For the first terminal device, the first terminal device can detect the reference signal in the resource associated with the second transmission direction associated with the first terminal device in the at least one resource; optionally, for the resource associated with other transmission directions in the at least one resource, the first terminal device can not detect the reference signal in the resource.

[0141] For example, the reference signal resource information indicates three resources associated with beam direction 1, beam direction 2, and beam direction 3 respectively. The first terminal device is associated with beam direction 1, so the first terminal device can detect the reference signal in the resource associated with beam direction 1, and does not need to detect the resource associated with other beam directions.

[0142] This application does not limit how the first terminal device determines the second transmission direction associated with itself. For example, the second transmission direction is the transmission direction of the selected SSB of the first terminal device, that is, the beam direction of the selected SSB. In the initial access process, the first terminal device first selects an SSB, and then selects an RO associated with the SSB index to send a preamble. The terminal device can take the transmission direction of the SSB as the second transmission direction associated with itself. The above is only an example, and the first terminal device can also determine the second transmission direction through other ways, which will not be described here.

[0143] The random access resource configuration information in step 1201 and the reference signal resource information in step 1202 can be carried through the same message, and at this time, step 1201 and step 1202 are executed at the same time. Of course, the random access resource configuration information and the reference signal resource information can also be carried through different messages, and this application does not limit it. If the random access resource configuration information and the reference signal resource information are carried through different messages, the execution order of step 1201 and step 1202 is not limited, and the above is only an example, which does not represent the execution order of step 1201 and step 1202.

[0144] Step 1202 is an optional step. If the network device does not send the reference signal resource information, the at least one resource can be preset or determined by other manners.

[0145] If the network device sends a downlink signal to a terminal device in one transmission direction, the network device can send a reference signal in the resource indicated by the reference signal resource information in the transmission direction. The specific process can be referred to the following flow.

[0146] Step 1203: In the first SBFD time unit, the network device sends a reference signal in the first transmission direction.

[0147] Correspondingly, in the first SBFD time unit, the first terminal device receives the reference signal from the network device in the first transmission direction.

[0148] In the third SBFD time unit, the network device can also send a downlink signal to the second terminal device in the first transmission direction through the second downlink resource. The specific content carried by the downlink signal is not limited in the present application, which can be control signaling or downlink data scheduled by the network device to the second terminal device, etc.

[0149] Optionally, the reference signal is a DMRS of a PDSCH channel used for data transmission, and the frequency domain resource occupied by the PDSCH channel used for data transmission is on the DL subband.

[0150] The reference signal can be located in the first downlink resource. The first downlink resource is one of the at least one resource indicated by the reference signal resource information, the first downlink resource corresponds to the first SBFD time unit, the second downlink resource corresponds to the third SBFD time unit, and the third SBFD time unit and the first SBFD time unit can be the same SBFD time unit, or the third SBFD time unit is located before the first SBFD time unit. Optionally, if the third SBFD time unit is located before the first SBFD time unit, the number of SBFD time units between the third SBFD time unit and the second SBFD time unit is less than or equal to the second number, and the second number is greater than or equal to 0. The second number can be determined by the network device, or can be preset. For example, the second number can be 1.

[0151] One resource corresponds to one SBFD time unit, which can mean that the time domain resource of the resource is part or all of the SBFD time unit, or the SBFD time unit includes all the time domain resources of the resource.

[0152] For example, taking the same as the third SBFD time unit and the first SBFD time unit as an example, the network device sends a downlink signal to the second terminal device in the first SBFD time unit through the second downlink resource of the PDSCH channel in the DL sub-band in the first transmission direction; the network device sends a reference signal in the first SBFD time unit through the first downlink resource indicated by the reference signal resource information in the first transmission direction, and the first downlink resource is located in the UL sub-band, and the reference signal can be a DMRS.

[0153] For a terminal device in an RRC idle state or an RRC inactive state, or a terminal device that does not receive a downlink signal of the network device, for example, the first terminal device, the first terminal device detects a reference signal in at least one resource associated with the second transmission direction associated with the first terminal device. Wherein, for the resource associated with other transmission directions in the at least one resource, although the first terminal device can not detect the reference signal in the resource, if the network device sends the reference signal in the resource, the first terminal device can also receive the reference signal in the resource.

[0154] The following takes the first terminal device receiving a reference signal from the network device through the first downlink resource in the first transmission direction as an example, and the first terminal device can determine whether to send a random access request message to the network device.

[0155] Step 1204: Satisfy the first condition, and the first terminal device sends a random access request message to the network device in the second SBFD time unit.

[0156] Correspondingly, in the second SBFD time unit, the network device receives a random access request message from the first terminal device.

[0157] Step 1204 can also be replaced by: satisfying the first condition, the first terminal device determines that it is allowed to send a random access request message to the network device in the second SBFD time unit, or the first terminal device determines that it is allowed to send a random access request message to the network device in the UL sub-band, or the first terminal device determines that it is allowed to initiate random access to the network device in the UL sub-band, or the first terminal device determines that it is allowed to perform PRACH in the UL sub-band.

[0158] Wherein, the random access request message can be carried in the first uplink resource, that is, the first uplink resource corresponds to the second SBFD time unit, and the first uplink resource can be a random access resource configured by the network device, for example, the first uplink resource is an RO included in the random access resource, and the first uplink resource can be configured through random access resource configuration information, and the random access resource configuration information can refer to the description in step 1201.

[0159] The second SBFD time unit can be located after the first SBFD time unit, or can be the same SBFD time unit as the first SBFD time unit. Optionally, if the second SBFD time unit is located after the first SBFD time unit, the number of SBFD time units between the second SBFD time unit and the first SBFD time unit is less than or equal to a first number, the first number is greater than or equal to 0, and the first number can be determined for the first terminal device, indicated by the network device, or preconfigured. For example, the first number can be 1.

[0160] The random access request message is used to initiate random access, and can be message 1 (such as a preamble) in a four-step random access process, or message A in a two-step random access process, which is not limited in the present application.

[0161] In the present application, the first condition can be used to determine whether the random access request message of the first terminal device in the second SBFD time unit will interfere with the downlink signal of the other terminal device. Optionally, if the first condition is met, it can be understood that the random access request message of the first terminal device in the second SBFD time unit will not interfere with the downlink signal of the other terminal device; if the first condition is not met, it can be understood that the random access request message of the first terminal device in the second SBFD time unit will interfere with the downlink signal of the other terminal device.

[0162] The first condition is determined according to at least one of the reference signal, the first transmission direction, and the second transmission direction associated with the first terminal device. In an implementation manner, the first condition includes at least one of the following:

[0163] The first transmission direction is the same as the second transmission direction, and the reference signal receiving power (RSRP) of the reference signal is greater than a threshold value;

[0164] The first transmission direction is different from the second transmission direction, and the reference signal receiving power of the reference signal is less than or equal to a threshold value;

[0165] The deviation between the first transmission direction and the second transmission direction is greater than a threshold value;

[0166] The first transmission direction is different from the second transmission direction;

[0167] The first transmission direction is the same as the second transmission direction, and the distance from the network device is less than or equal to a distance threshold value.

[0168] Wherein, the RSRP can be replaced by a measurement value such as reference signal received quality (RSRQ) or received signal strength indicator (RSSI). Wherein, at least one of the distance threshold, the threshold, the offset, and the threshold can be preset, configured by the network device, or determined by the first terminal device, and the present application does not limit this.

[0169] Wherein, one transmission direction corresponds to one index, and the transmission direction can be indicated by the index. The index can be an index of the transmission direction, or an SSB index corresponding to the transmission direction. The first transmission direction is the same as the second transmission direction, which can mean that the index (such as SSB index) of the first transmission direction is the same as the index (such as SSB index) of the second transmission direction. The first transmission direction is different from the second transmission direction, which can mean that the index (such as SSB index) of the first transmission direction is different from the index (such as SSB index) of the second transmission direction.

[0170] Wherein, the offset of the first transmission direction and the second transmission direction can mean the angle difference of the first transmission direction and the second transmission direction, or the difference of the SSB index of the first transmission direction and the SSB index of the second transmission direction. For example, as shown in FIG. 13A, taking the transmission direction as a beam as an example, the network device transmits SSBs using 8 beams, each beam corresponds to an SSB index of 1 to 8, and the 8 beams are uniformly distributed in the circumference, that is, the angle difference of the adjacent two beams is 45°. Assuming that the threshold is 45°, the index of the first beam is 1, and the index of the second beam is 3 or 7, the offset of the first beam and the second beam is greater than the threshold.

[0171] In the present application, the first terminal device determines that the first transmission direction is the same as the second transmission direction, and the reference signal received power of the reference signal is greater than the threshold. The first terminal device can send a random access request message to the network device through the first uplink resource. Optionally, at this time, the first terminal device transmits the random access request message using a smaller power, for example, the power of the first terminal device transmitting the random access request message is less than the maximum transmission power of the first terminal device, or the power climbing step of the first terminal device transmitting the random access request message is smaller.

[0172] In another implementation, the second condition is met, and the first terminal device does not send a random access request message to the network device, or determines that the random access resource is not allowed to be used, or determines that the random access request message is not allowed to be sent. In this application, "not allowed" can be replaced by "prohibited" and the like; "allowed" can be replaced by "able" and the like. Among them, if the second condition is met, it can be understood that the random access request message of the first terminal device in the second SBFD time unit will interfere with the downlink signal of other terminal devices.

[0173] For example, if the second condition is met, the first terminal device does not send a random access request message in the second SBFD time unit, or determines that the random access resource is not allowed to be used in the second SBFD time unit, or determines that the random access request message is not allowed to be sent in the second SBFD time unit.

[0174] The second condition includes at least one of the following: the first transmission direction is the same as the second transmission direction; the first transmission direction is the same as the second transmission direction, the reference signal received power of the reference signal is less than or equal to a threshold; the distance between the first transmission direction and the second transmission direction is greater than a distance threshold; and the deviation of the first transmission direction and the second transmission direction is less than or equal to a threshold.

[0175] For example, as shown in FIG. 13B, UE1, UE2, and UE3 are associated with transmission direction 1, UE4 is associated with transmission direction 2, and UE5 is associated with transmission direction 3. In SBFD time unit 1, the network device sends a downlink signal to UE1 using transmission direction 1 in the DL subband, and sends a reference signal in the DL subband using the downlink resource in transmission direction 1.

[0176] For UE2, any of the following implementation modes can be used to determine whether to send a random access request message. Implementation mode 1-1, the transmission direction 1 associated with UE2 is the same as the transmission direction 1 of the received reference signal, then in the SBFD time unit 1, the random access request message is not sent to the network device, that is, the PRACH resource in the UL subband is not used to send the random access request message, that is, the random access resource is not allowed to be used in the SBFD time unit 1.

[0177] Implementation mode 1-2, the transmission direction 1 associated with UE2 is the same as the transmission direction 1 of the received reference signal, and the RSRP of the received reference signal in the transmission direction 1 is greater than a threshold, in the SBFD time unit 1, the random access request message can be sent to the network device, that is, the PRACH resource in the UL subband can be used to send the random access request message, that is, the random access resource is allowed to be used in the SBFD time unit 1. Among them, in this case, whether the UE2 finally sends a random access request message is not limited in this application.

[0178] In implementation 1-3, the transmission direction 1 associated with the UE 2 is the same as the transmission direction 1 of the received reference signal, and the distance between the UE 2 and the network device is less than or equal to the distance threshold. In the SBFD time unit 1, the UE 2 can send a random access request message to the network device.

[0179] For the UE 3, any of the following implementations can be used to determine whether to send a random access request message. In implementation 2-1, the transmission direction 1 associated with the UE 3 is the same as the transmission direction 1 of the received reference signal. In the SBFD time unit 1, the UE 3 does not send a random access request message to the network device, i.e., does not use the PRACH resource in the UL sub-band to send a random access request message, i.e., the random access resource is not allowed to be used in the SBFD time unit 1.

[0180] In implementation 2-2, the transmission direction 1 associated with the UE 3 is the same as the transmission direction 1 of the received reference signal, and the RSRP of the received reference signal in the transmission direction 1 is less than or equal to a threshold. In the SBFD time unit 1, the UE 3 does not send a random access request message to the network device.

[0181] In implementation 2-3, the transmission direction 1 associated with the UE 3 is the same as the transmission direction 1 of the received reference signal, and the distance between the UE 2 and the network device is greater than the distance threshold. In the SBFD time unit 1, the UE 3 does not send a random access request message to the network device.

[0182] For the UE 4, any of the following implementations can be used to determine whether to send a random access request message. In implementation 3-1, the transmission direction 2 associated with the UE 4 is different from the transmission direction 1 of the received reference signal, and the RSRP of the received reference signal in the transmission direction 1 is greater than a threshold. In the SBFD time unit 1, the UE 4 does not send a random access request message to the network device, i.e., does not use the PRACH resource in the UL sub-band to send a random access request message, i.e., the random access resource is not allowed to be used in the SBFD time unit 1.

[0183] In implementation 3-2, the transmission direction 2 associated with the UE 4 is different from the transmission direction 1 of the received reference signal, and the deviation between the transmission direction 1 and the transmission direction 2 is less than or equal to a threshold. In the SBFD time unit 1, the UE 4 does not send a random access request message to the network device.

[0184] In implementation 3-3, the transmission direction 2 associated with the UE 4 is different from the transmission direction 1 of the received reference signal. In the SBFD time unit 1, the UE 4 can send a random access request message to the network device, i.e., can use the PRACH resource in the UL sub-band to send a random access request message, i.e., the random access resource is allowed to be used in the SBFD time unit 1.

[0185] For the UE 5, any of the following implementations can be used to determine whether to send a random access request message. Implementation 4-1, the transmission direction 3 associated with the UE 5 is different from the transmission direction 1 of the received reference signal, and the RSRP of the reference signal received in the transmission direction 1 is less than or equal to a threshold value, the random access request message can be sent to the network device, that is, the random access request message can be sent using the PRACH resource in the UL sub-band, that is, the random access resource is allowed to be used in the SBFD time unit 1.

[0186] Implementation 4-2, the transmission direction 3 associated with the UE 5 is different from the transmission direction 1 of the received reference signal, and the deviation between the transmission direction 1 and the transmission direction 2 is greater than a first threshold, the random access request message can be sent to the network device.

[0187] Implementation 4-3, the transmission direction 2 associated with the UE 5 is different from the transmission direction 1 of the received reference signal, and in the SBFD time unit 1, the random access request message can be sent to the network device, that is, the random access request message can be sent using the PRACH resource in the UL sub-band, that is, the random access resource is allowed to be used in the SBFD time unit 1.

[0188] In this application, the reference signal and the random access request message are separated by a first time length in the time domain, that is, the first downlink resource and the first uplink resource are separated by a first time length in the time domain, and the first time length is greater than or equal to the time delay required for the first terminal device to perform uplink-downlink conversion. The time delay required for the first terminal device to perform uplink-downlink conversion can be the minimum time length required for the transceiver module of the first terminal device to switch uplink-downlink (from uplink to downlink, or from downlink to uplink), which can be understood as the time required for the radio frequency transmission channel of the transceiver module to adjust to the frequency after switching. The first time length can be pre-set, determined by the first terminal device, or indicated by the network device. The first time length can be an absolute time in units of milliseconds / seconds / minutes, etc., for example, the first time length is 20 milliseconds; the first time length can also be a relative time in units of frames, subframes, slots, subslots, received signaling numbers, etc., for example, the first time length is 3 slots.

[0189] As shown in FIG. 14, considering the time delay required for the UE to switch between uplink and downlink, it is assumed that the first downlink resource in which the UE receives the reference signal is in symbol 1 of the SBFD time slot. Assuming that the first time length corresponds to a time length of 5 symbols, if the first condition is met, the UE is allowed to use the random access resource, and the UE can use the random access resource to send a random access request in the subsequent symbols of the SBFD time slot, for example, using the RO in symbol 7 in the SBFD time slot to send a random access request. As can be seen from the figure, due to the time required for uplink and downlink switching, the ROs within the first time length after symbol 1 cannot be used, i.e., the UE cannot use the ROs in symbols 2 to 6 in the SBFD time slot.

[0190] In another implementation, the existing random access resource configuration information is multiplexed or new random access resource configuration information is designed, so that the ROs in the random resource indicated by the random resource configuration information are separated from the resources for transmitting the reference signal in the time domain by a first time length, so that each resource for transmitting the reference signal is not configured with an RO within the first time length, and the ROs only appear in the time domain after the first time length of the resource for transmitting the reference signal. This can avoid the situation that part of the ROs cannot be used by the UE and are wasted, and improve resource utilization.

[0191] By the method provided in the present application, before initiating the random access, the first terminal device determines whether to send a random access request message according to the reference signal, the first transmission direction of the reference signal, and the second transmission direction associated with itself, which can reduce the interference of the random access request message sent in the SBFD time unit to the downlink transmission of other terminal devices, and improve system efficiency.

[0192] The present application also provides a method, which can be used by a network device to determine whether a terminal device can use a random access resource, and to indicate to the terminal device whether the terminal device is allowed to use the random access resource, which will be described in detail below.

[0193] As shown in FIG. 15, a communication method flowchart provided by an embodiment of the present application is shown, and the method includes the following steps:

[0194] Step 1501: The network device sends random access resource configuration information.

[0195] Correspondingly, the second terminal device receives the random access resource configuration information from the network device.

[0196] The random access resource configuration information can also be referred to as PRACH resource configuration, and the random access resource can also be referred to as PRACH resource. The random access resource includes multiple ROs, and the random access resource can be located in an UL subband.

[0197] In this application, the random access resource indicated by the random access resource configuration information can be located in the SBFD time unit in the time domain, that is, the RO included in the random access resource can occupy the SBFD time unit in the time domain. The SBFD time unit can refer to an SBFD time slot or an SBFD symbol, etc. Alternatively, the random access resource indicated by the random access resource configuration information can also be located in the non-SBFD time unit in the time domain. That is, a plurality of ROs in the random access resource can have a part of ROs corresponding to the SBFD time unit, and another part of ROs corresponding to the non-SBFD time unit. The non-SBFD time unit can refer to a time unit including only uplink frequency domain resources or downlink frequency domain resources.

[0198] The specific content of the random access resource configuration information can refer to the description in step 1201, which will not be repeated here.

[0199] Step 1501 is an optional step, and the random access resource configuration information can also be configured by other manners, which is not limited in the present application.

[0200] Step 1502: The network device sends reference signal resource configuration information.

[0201] Correspondingly, the first terminal device and the second terminal device receive the reference signal resource configuration information from the network device. The reference signal resource configuration information indicates the reference signal resource used for transmitting the reference signal. Wherein, the reference signal can also be replaced by UL signal and other names, which is not limited in the present application.

[0202] Wherein, the network device can broadcast the reference signal resource configuration information, or send the reference signal resource configuration information to the first terminal device and the second terminal device respectively, which is not limited in the present application.

[0203] Wherein, the reference signal resource indicated by the reference signal resource configuration information is used for the first terminal device to send the reference signal. The reference signal resource indicated by the reference signal resource configuration information can be located in the UL sub-band, and the reference signal can be a demodulation reference signal (DMRS), a physical downlink shared channel (PDSCH) signal, or other signals, which is not limited in the present application.

[0204] In an implementation manner, the reference signal resource configuration information can indicate the time domain position, the frequency domain position and the associated transmission direction of the reference signal resource. The number of the reference signal resource indicated by the reference signal resource configuration information is not limited, and at least one reference signal resource can be indicated.

[0205] In an implementation, the reference signal resource configuration information further indicates a transmission power of the reference signal in the reference signal resource, for example, the transmission power can be indicated as the maximum transmission power of the first terminal device. Accordingly, the first terminal device can transmit the reference signal in the UL sub-band through the reference signal resource with the maximum transmission power.

[0206] Step 1502 is an optional step. If the network device does not transmit the reference signal resource configuration information, the reference signal resource can be preset or determined through other manners.

[0207] Step 1503: The first terminal device transmits the reference signal through the reference signal resource.

[0208] Accordingly, the second terminal device receives the reference signal through the reference signal resource.

[0209] The second terminal device measures the reference signal in the reference signal resource to obtain a measurement value. The measurement value can include one or more of the power of the reference signal, the RSRP of the reference signal, the RSRQ of the reference signal, and the RSSI of the reference signal.

[0210] Optionally, step 1504: The second terminal device transmits the measurement value of the reference signal to the network device.

[0211] In an implementation, if the measurement value is less than or equal to a second threshold, the second terminal device can not transmit the measurement value to the network device. At this time, step 1504 can not be performed. The second threshold can be preset, configured by the network device, or determined by the first terminal device, and the present application is not limited thereto.

[0212] In an implementation, if the measurement value is greater than the second threshold, the second terminal device transmits the measurement value to the network device.

[0213] Implementation one: The network device and the terminal device can perform the following flow.

[0214] Step 1505: The first condition is met, and the network device determines the first indication information.

[0215] The first indication information is used to indicate that the random access resource in the SBFD time unit is allowed to be used. The allowed random access resource in the SBFD time unit can be replaced by any of the following descriptions: the random access request message is allowed to be sent by using the random access resource in the SBFD time unit, or the random access request message is allowed to be sent or initiated in the SBFD time unit, or the random access resource or RO in the SBFD time unit is activated, or the random access is allowed to be initiated by using the random access resource in the SBFD time unit, or the RO is allowed to be used in the SBFD time unit, or the random access request message is allowed to be sent by using the RO in the SBFD time unit. The SBFD time unit here does not refer to a certain SBFD time unit.

[0216] In this embodiment, the first condition is determined according to at least one of the measurement value from the first terminal device and the data transmission state of the first terminal device; and the data transmission state of the first terminal device indicates whether the first terminal device is scheduled to send a downlink signal in the first SBFD time unit.

[0217] In an implementation manner, the first condition includes at least one of the following:

[0218] The measurement value from the first terminal device is not received;

[0219] The measurement value is less than a first threshold value;

[0220] The measurement value is greater than or equal to the first threshold value, and the first terminal device is not scheduled to send a downlink signal in the first SBFD time unit.

[0221] The first threshold value can be preset or determined by the network device, and the present application does not limit this.

[0222] For example, the network device does not receive the measurement value from the first terminal device, or receives the measurement value which is less than the first threshold value, so that the network device can allow the second terminal device to use the random access resource in the UL sub-band in the SBFD time unit.

[0223] For another example, the network device receives the measurement value from the first terminal device, which is greater than or equal to the first threshold value, that is, the first terminal device and the second terminal device are relatively close, but the network device does not schedule the first terminal device to send a downlink signal in the first SBFD time unit, so that the network device can allow the second terminal device to use the random access resource in the UL sub-band.

[0224] Step 1506: The network device sends the first indication information to the second terminal device.

[0225] Correspondingly, the second terminal device receives the first indication information from the network device.

[0226] Step 1507: The second terminal device determines, according to the first indication information, that the random access request message is allowed to be sent to the network device through the random access resource in the SBFD time unit.

[0227] It can be understood that the second terminal device determines, according to the first indication information, that the random access request message is allowed to be sent using the random access resource in the SBFD time unit, or that the random access is allowed to be initiated using the random access resource in the SBFD time unit, or that the RO is allowed to be used in the SBFD time unit, or that the random access request message is allowed to be sent using the RO in the SBFD time unit. The SBFD time unit here does not refer to a certain SBFD time unit.

[0228] After the second terminal device receives the first indication information, the second terminal device can send the random access request message to the network device in the SBFD time unit in the case of needing to access the network device. Whether the second terminal device sends the random access request message or not is not limited by the present application.

[0229] The random access request message is used to initiate random access, and the random access request message can be message 1 in a four-step random access process or message A in a two-step random access process, which is not limited by the present application.

[0230] In an implementation manner, if the second terminal device initiates random access after receiving the first indication information, the second terminal device can send the random access request message to the network device in the SBFD time unit. If the second terminal device does not receive the first indication information, the second terminal device cannot send the random access request message to the network device through the random access resource in the SBFD time unit.

[0231] In an implementation manner, if the second terminal device initiates random access after receiving the first indication information, the second terminal device can send the random access request message to the network device in the SBFD time unit. If the second terminal device does not receive the first indication information, the second terminal device cannot send the random access request message to the network device through the random access resource in the SBFD time unit.

[0232] Optionally, in the second implementation manner, steps 1504 to 1506 can be replaced by the following steps:

[0233] Step 1508: The network device sends the second indication information to the second terminal device when the second condition is met.

[0234] Correspondingly, the second terminal device receives the second indication information from the network device.

[0235] The second indication information is used for indicating that the random access resource in the SBFD time unit is not allowed to be used. The not allowed to be used can be replaced by any one of the following descriptions: not allowed to be used to send a random access request message in the SBFD time unit, or not allowed to send a random access request message or initiate random access in the SBFD time unit, or deactivate the random access resource or RO in the SBFD time unit, or not allowed to initiate random access using the random access resource in the SBFD time unit, or not allowed to use the RO in the SBFD time unit, or not allowed to use the RO to send a random access request message in the SBFD time unit. The SBFD time unit here does not refer to a certain SBFD time unit. The not allowed here can also be replaced by descriptions such as prohibited.

[0236] In this embodiment, the second condition includes at least one of the following: the measurement value is greater than or equal to the first threshold value; and the first terminal device is scheduled to send a downlink signal in the first SBFD time unit.

[0237] For example, the network device receives a measurement value from the first terminal device, and the measurement value is greater than or equal to the first threshold value, that is, the first terminal device and the second terminal device are close to each other. Therefore, the network device can not allow the second terminal device to use the random access resource in the UL sub-band.

[0238] For example, the network device schedules the first terminal device to send a downlink signal in the first SBFD time unit. Therefore, the network device can not allow the second terminal device to use the random access resource in the UL sub-band.

[0239] For example, the network device receives a measurement value from the first terminal device, and the measurement value is greater than or equal to the first threshold value, that is, the first terminal device and the second terminal device are close to each other. Therefore, the network device can not allow the second terminal device to use the random access resource in the UL sub-band.

[0240] For example, the network device receives a measurement value from the first terminal device, and the measurement value is greater than or equal to the first threshold value, and the network device schedules the first terminal device to send a downlink signal in the first SBFD time unit. Therefore, the network device can not allow the second terminal device to use the random access resource in the UL sub-band.

[0241] Optionally, the second indication information further indicates a first time length, that is, the second indication information can indicate that the random access resource in the first SBFD time unit is not allowed to be used within the first time length. The start time of the first time length can be the time of receiving the second indication information. The first time length can also be preset or agreed by protocol, and the present application does not limit this.

[0242] Step 1509: The second terminal device determines not to send the random access request message to the network device through the random access resource in the SBFD time unit according to the second indication information.

[0243] In the case that the second terminal device receives the second indication information, the second terminal device can send the random access request message to the network device through the random access resource in the non-SBFD time unit, for example, send the random access request message in the time unit including only the uplink frequency domain resource.

[0244] In the embodiment, the network device can only send one of the first indication information and the second indication information, and the other information is not sent. For example, the network device sends the first indication information and does not send the second indication information in the case that the first condition is met. For another example, the network device sends the second indication information and does not send the first indication information in the case that the second condition is met.

[0245] Optionally, in another implementation manner, the network device sends the second indication information and does not send the first indication information in the case that the first condition is not met. For another example, the network device sends the first indication information and does not send the second indication information in the case that the second condition is not met.

[0246] Through the method provided in the application, the network device explicitly indicates whether the second terminal device is allowed to use the random access resource through the first indication information or the second indication information, so that the second terminal device determines whether to send the random access request message according to the first indication information or the second indication information, which can reduce the interference of the random access request message sent in the SBFD time unit to the downlink transmission of other terminal devices, and improve the system efficiency.

[0247] The application also provides a method for determining whether a terminal device is allowed to use a random access resource in an SBFD time unit by a network device, which will be described in detail below.

[0248] As shown in FIG. 16, it is a flowchart of a communication method provided by an embodiment of the application, and the method comprises the following steps:

[0249] Step 1601: The network device sends random access resource configuration information.

[0250] Correspondingly, the terminal device receives the random access resource configuration information from the network device.

[0251] The random access resource configuration information can also be referred to as PRACH resource configuration, and the like. The random access resource configuration information can indicate a random access resource, which can also be referred to as a PRACH resource. The random access resource includes at least one RO. An RO can be considered as a block of time-frequency resource in the random access resource. The RO can be used to transmit a random access request message, for example, a preamble.

[0252] In an implementation manner, the random access resource configuration information can indicate at least one of the following: a starting position of the random access resource in the frequency domain, for example, which can be referred to in the description related to FIG. 6; a frequency division multiplexing number of the random access resource, for example, which can be referred to in the description related to FIG. 6; time domain information of the random access resource, for example, time domain information such as a period of time domain distribution of the random access resource, a frame number, a subframe number, a time slot number, and a number of ROs in a time slot, for example, which can be referred to in the description related to FIG. 5. The above is only an example, and the random access resource configuration information can also indicate other information of the random access resource, which is not limited in the present application.

[0253] The network device can also configure a mapping relationship between an RO in the random access resource and an SSB through a high-layer parameter, for example, the high-layer parameter can be ssb-perRACH-OccasionAndCB-PreamblesPerSSB. One SSB index can be associated with multiple ROs, or multiple SSB indexes can be associated with one RO. According to the mapping relationship between the RO and the SSB, the transmission direction associated with the RO can be determined, that is, the beam direction associated with the RO can be determined.

[0254] In the present application, the network device can transmit the random access resource configuration information in a DL subband. The random access resource indicated by the random access resource configuration information can be located in a UL subband. The UL subband and the DL subband can belong to the same carrier. In one SBFD time unit, the resource of the UL subband and the resource of the DL subband can be included.

[0255] In an implementation manner, the network device can transmit the random access resource configuration information through a system information block (SIB). For example, the SIB is SIB1, and the random access resource configuration information is RACH-ConfigCommon in the SIB1. Alternatively, if the SIB is SIB1, a different information element than RACH-ConfigCommon can also be reconfigured, that is, other information elements in the SIB1 or new information elements in the SIB1 are used to carry the random access resource configuration information.

[0256] In another implementation, the network device can send the random access resource configuration information through dedicated signaling. For example, when considering that the RRC connected terminal device can perform PRACH on the UL sub-band, the network device can use dedicated signaling to send the random access resource configuration information on the UL sub-band to the terminal device in the RRC connected state.

[0257] Step 1602: The network device sends the resource configuration information.

[0258] Correspondingly, the terminal device receives the resource configuration information from the network device.

[0259] The resource configuration information indicates the resource used for transmitting the first information. The resource configuration information can be the configuration information of the first information, and the first information is used to indicate which ROs in the random access resource are used or activated or allowed to use.

[0260] In an implementation, the resource configuration information is type 3 common search space (CSS) configuration information, which can be used to transmit the first information. At this time, the first information can be group downlink control information (DCI).

[0261] In an implementation, the resource configuration information is the resource information of the MAC CE. At this time, the first information can be the MAC CE, which can use a new logical channel identification (LCID). The MAC CE can also be referred to as a newly added MAC CE activation information.

[0262] Optionally, at this time, the terminal device is in the RRC connected state.

[0263] Step 1602 is an optional step, and the resource configuration information can also be determined through other manners, which is not limited in the application.

[0264] In an implementation, the network device can send the first information in the case that there is no downlink signal transmission in the first SBFD time unit. For details, refer to the description in step 1603. The downlink signal can include downlink data and / or downlink signaling sent to the terminal device, etc.

[0265] Step 1603: The network device sends the first information to the terminal device.

[0266] Correspondingly, the terminal device receives the first information from the network device.

[0267] The first information indicates that M random access channel occasions corresponding to the first SBFD time unit in the random access resource are allowed to be used, where M is an integer greater than 0. The M random access channel occasions corresponding to the first SBFD time unit in the random access resource can be located within the first SBFD time unit in the time domain, for example, the first SBFD time unit can be an SBFD slot or an SBFD symbol.

[0268] For example, taking (a) in the foregoing FIG. 2 as an example, time slots 1 to 3 in the figure are SBFD time slots. If the network device does not schedule downlink signal transmission in time slot 1, the first information can be sent in time slot 1. At this time, the first information indicates that M random access channel occasions in time slot 1 are allowed to be used. The terminal device receives the first information in time slot 1, and determines that the M random access channel occasions in time slot 1 can be used.

[0269] In this application, the first information indicating that M random access channel occasions corresponding to the first SBFD time unit in the random access resource are allowed to be used can also be replaced by the following description: the first information indicates that M random access channel occasions corresponding to the first SBFD time unit in the random access resource are activated, or the first information indicates that random access or sending a random access request message is allowed in the first SBFD time unit, or the first information indicates that random access or sending a random access request message is allowed in the first SBFD time unit using the random access resource.

[0270] In the case that the terminal device receives the first information, according to the first information, it can be determined that in the first SBFD time unit, M random access channel occasions corresponding to the first SBFD time unit in the random access resource are allowed to be used, that is, it is determined that in the first SBFD time unit, random access is allowed to be initiated, or the random access resource is allowed to be used, or the random access channel occasion is allowed to be used, or the random access request message is allowed to be sent.

[0271] After the terminal device receives the first information, in the case that it needs to access the network device, it can send a random access request message to the network device using one of the M random access channel occasions in the first SBFD time unit. Whether the terminal device specifically sends a random access request message in the first SBFD time unit is not limited by the present application. Optionally, if the terminal device sends a random access request message, the terminal device can send a random access request message to the network device through a first random access channel occasion in the M random access channel occasions in the first SBFD time unit. How the terminal device specifically determines the first random access channel occasion is not limited by the present application.

[0272] In an implementation, if the first information is group DCI, the terminal device can blindly detect the group DCI in the type 3 CSS. Optionally, a radio network temporary identity (RNTI) used by the group DCI can be an RNTI specially used to activate the PRACH resource usage on the SBFD.

[0273] In an implementation, if the first information is MAC CE, the terminal device can receive the MAC CE in the resource indicated by the resource configuration information.

[0274] Optionally, the first information can be located in the first SBFD time unit or in a second SBFD time unit before the first SBFD time unit.

[0275] For example, the network device has no downlink signal transmission in the DL sub-band of the first SBFD time unit, i.e., does not send a downlink signal to the terminal device, and the network device can allow the terminal device to use the random access resource in the UL sub-band of the first SBFD time unit.

[0276] In an implementation, the network device can send different first information in different transmission directions. In this implementation, the network device sends the first information according to the granularity of the transmission direction.

[0277] In this implementation, in the first SBFD time unit, if there is no downlink signal transmission in the first transmission direction, the network device sends the first information in the first transmission direction. Correspondingly, the terminal device determines to allow the use of the random access resource in the M random access channel occasions corresponding to the first SBFD time unit, i.e., determines to allow the initiation of random access or the use of random access resource or the use of random access channel occasion or the sending of random access request message in the first SBFD time unit, in the case of receiving the first information. Optionally, the terminal device is associated with the first transmission direction.

[0278] In this implementation, in the first SBFD time unit, if there is downlink signal transmission in the second transmission direction and no downlink signal transmission in other transmission directions (e.g., the first transmission direction), the network device can not send the first information in the second transmission direction. At this time, the terminal device does not receive the first information, and can determine not to allow the use of the random access resource in the M random access channel occasions corresponding to the first SBFD time unit, i.e., determines not to allow the use of the random access resource in the UL sub-band, i.e., determines not to allow the initiation of random access or the use of random access resource or the use of random access channel occasion or the sending of random access request message in the first SBFD time unit.

[0279] For example, in the first SBFD time unit, the network device has no downlink signal transmission in the first transmission direction and the second transmission direction, the network device can send information 1 to the terminal device in the first transmission direction and send information 2 to the terminal device in the second transmission direction, the information 1 indicates that M1 random access channel occasions corresponding to the first SBFD time unit are allowed to be used, the information 2 indicates that M2 random access channel occasions corresponding to the first SBFD time unit are allowed to be used, M1 and M2 are integers greater than 0. Wherein, each of the M1 random access channel occasions indicated by the information 1 is associated with the first transmission direction, and each of the M2 random access channel occasions indicated by the information 2 is associated with the second transmission direction.

[0280] Optionally, the first information can explicitly or implicitly indicate the transmission direction associated with each of the M random access channel occasions, for example, it is agreed that the transmission direction associated with the M random access channel occasions indicated by the first information is the same as the transmission direction of the first information.

[0281] In another implementation manner, the network device has no downlink signal transmission in the first transmission direction in the first SBFD time unit, and the network device sends the first information to the terminal device in multiple transmission directions, the first information sent in each transmission direction is the same, and the multiple transmission directions include the first transmission direction. At this time, part or all of the M random access channel occasions are associated with the first transmission direction.

[0282] Optionally, at this time, the first information also indicates the transmission direction associated with each of the M random access channel occasions.

[0283] In this implementation manner, if the network device also has no downlink signal transmission in other transmission directions (for example, the second transmission direction), the M random access channel occasions indicated by the first information can also include random access channel occasions associated with the other transmission directions (for example, the second transmission direction).

[0284] For example, there is downlink signal transmission in the transmission direction 1 and no downlink signal transmission in other transmission directions (for example, the transmission direction 2), and the network device sends the first information in the transmission direction 1 and the transmission direction 2, at this time, the M random access channel occasions indicated by the first information include random access channel occasions associated with the transmission direction 1 and / or the transmission direction 2. At this time, the terminal device receives the first information, and can use the M random access channel occasions indicated by the first information in the UL subband.

[0285] Optionally, each of the M random access channel occasions is associated with one or more of the multiple transmission directions.

[0286] In this application, how the first information indicates the M random access channel occasions in the random access resource is not limited in this application.

[0287] For example, if all the random access channel occasions in the random access resource can be used, i.e., the M random access channel occasions are all the random access channel occasions in the random access resource, the first information can indicate that the complete PRACH resource on the UL sub-band is allowed to be used, i.e., indicate that all the random access channel occasions in the random access resource on the UL sub-band are allowed to be used.

[0288] For another example, if part of the random access channel occasions in the random access resource can be used, i.e., the M random access channel occasions are part of the random access channel occasions in the random access resource, the first information can indicate the index of each random access channel occasion in the M random access channel occasions, i.e., can indicate that part of the PRACH resource on the UL sub-band is allowed to be used. Alternatively, all the random access channel occasions in the random access resource can be divided into multiple RO sets, and the first information can indicate the RO set in which the M random access channel occasions are located.

[0289] For example, as shown in FIG. 17, the random access resource includes ROs including two RO sets, RO set 1 and RO set 2, the two rows of random access channel occasions close to the DL sub-band in the figure are located in RO set 1, and a white square represents a random access channel occasion in RO set 1; the random access channel occasions of the frequency domain resource close to the center position of the UL sub-band in the figure are located in RO set 2, and a black square represents a random access channel occasion in RO set 2. If the RO in RO set 2 can be used, the first information can indicate RO set 2. It should be noted that in the foregoing random access resource configuration information, it is also indicated that each random access channel occasion in the random access resource belongs to which RO set.

[0290] Optionally, in the case that the network device has downlink signal transmission in the first SBFD time unit, the network device can send the second information, for details, refer to the description in step 1604.

[0291] Step 1604: The network device sends the second information to the terminal device.

[0292] Correspondingly, the terminal device receives the second information from the network device.

[0293] The second information indicates that the M random access channel occasions corresponding to the first SBFD time unit in the random access resource are not allowed to be used, and M is an integer greater than 0.

[0294] In an implementation, the second information indicates that the M random access channel occasions corresponding to the first SBFD time unit in the random access resource are not allowed to be used. Alternatively, the second information indicates that the M random access channel occasions corresponding to the first SBFD time unit in the random access resource are deactivated, or the second information indicates that the random access channel occasions corresponding to the first SBFD time unit in the random access resource are deactivated, or the second information indicates that the random access resource or the random access channel occasions in the first SBFD time unit are deactivated, or the second information indicates that the random access or the sending of the random access request message is not allowed in the first SBFD time unit, or the second information indicates that the random access or the sending of the random access request message is not allowed to be initiated using the random access resource or the random access channel occasion in the first SBFD time unit, or the second information indicates that the random access channel occasion corresponding to the first SBFD time unit in the random access resource is not allowed to be used.

[0295] In the case that the terminal device receives the second information, the terminal device can determine, according to the second information, that the M random access channel occasions corresponding to the first SBFD time unit in the random access resource are not allowed to be used in the first SBFD time unit, i.e., that the random access or the sending of the random access request message is not allowed to be initiated, or that the random access resource or the random access channel occasion is not allowed to be used, or that the random access request message is not allowed to be sent, or that the random access resource or the random access channel occasion in the first SBFD time unit is deactivated.

[0296] In an implementation, if the second information is a group DCI, the terminal device can blindly detect the group DCI in the type 3 CSS. Optionally, the RNTI used by the group DCI can be an RNTI specially used to activate the use of the PRACH resource on the SBFD.

[0297] In an implementation, if the second information is a MAC CE, the terminal device can receive the MAC CE in the resource indicated by the resource configuration information.

[0298] Optionally, the second information can be located in the first SBFD time unit, or can be located in a second SBFD time unit before the first SBFD time unit.

[0299] In an implementation, the second information sent by the network device in different transmission directions can be different. In this implementation, the network device sends the second information according to the granularity of the transmission direction.

[0300] In the implementation, in the first SBFD time unit, if there is downlink signal transmission in the first transmission direction, the network device sends the second information in the first transmission direction. Correspondingly, the terminal device determines that the random access resource is not allowed to be used in the M random access channel occasions corresponding to the first SBFD time unit in the case of receiving the second information, that is, it is determined that the random access is not allowed to be initiated or the random access resource is not allowed to be used or the random access channel occasion is allowed to be used or the random access request message is allowed to be sent in the first SBFD time unit. Optionally, the terminal device is associated with the first transmission direction.

[0301] In the implementation, in the first SBFD time unit, if there is no downlink signal transmission in the second transmission direction and there is downlink signal transmission in other transmission directions (for example, the first transmission direction), the network device can not send the second information in the second transmission direction. At this time, the terminal device does not receive the second information, and it can be determined that the random access resource is allowed to be used in the M random access channel occasions corresponding to the first SBFD time unit, that is, it is determined that the random access resource in the UL subband is allowed to be used, that is, it is determined that the random access is allowed to be initiated or the random access resource is allowed to be used or the random access channel occasion is allowed to be used or the random access request message is allowed to be sent in the first SBFD time unit.

[0302] In another implementation, the network device has downlink signal transmission in the first transmission direction in the first SBFD time unit, and the network device sends the second information to the terminal device in multiple transmission directions, the second information sent in each transmission direction is the same, and the multiple transmission directions include the first transmission direction. At this time, part or all of the M random access channel occasions are associated with the first transmission direction.

[0303] In the present application, the network device can only send one of the first information and the second information, and the other information is not sent. For example, the network device has no downlink signal transmission in the first SBFD time unit, and sends the first information. The network device has downlink signal transmission in the first SBFD time unit, and does not send the first information and does not send the second information. Correspondingly, the terminal device receives the first information, and determines that the random access resource is allowed to be used in the M random access channel occasions corresponding to the first SBFD time unit; the terminal device does not receive the first information, and determines that the random access resource is not allowed to be used in the M random access channel occasions corresponding to the first SBFD time unit.

[0304] For another example, the network device has downlink signal transmission in the first SBFD time unit, and the second information is sent. The network device has no downlink signal transmission in the first SBFD time unit, and neither the first information nor the second information is sent. Correspondingly, the terminal device receives the second information, and determines that the random access resource is not allowed to be used in the M random access channel occasions corresponding to the first SBFD time unit; the terminal device does not receive the second information, and determines that the random access resource is allowed to be used in the M random access channel occasions corresponding to the first SBFD time unit.

[0305] By the method provided in the present application, the network device explicitly indicates through the first information that the terminal device is allowed to use the random access resource in the first SBFD time unit, so that the terminal device determines according to the first information that the random access request message can be sent in the first SBFD time unit, which can reduce the interference of the random access request message sent in the SBFD time unit to the downlink transmission of other terminal devices, and improve the system efficiency.

[0306] It can be understood that, in order to realize the functions in the above embodiments, the terminal device or the network device includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, in combination with the units and method steps of each example described in the embodiments disclosed in the present application, the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is realized in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0307] The following is a possible structure of a communication device provided by the embodiments of the present application. These communication devices can be used to realize the functions of the terminal device or the network device in the above method embodiments, and thus can also realize the beneficial effects possessed by the above method embodiments.

[0308] As shown in FIG. 18, the communication device 1800 includes a processing unit 1810 and a communication unit 1820. The communication device 1800 is used to realize the functions of the terminal device or the network device in each of the above method embodiments.

[0309] When the communication device 1800 is used to realize the functions of the terminal device:

[0310] The communication unit is configured to receive, in a first transmission direction, a reference signal from a network device in a first sub-band full-duplex (SBFD) time unit.

[0311] The processing unit is configured to satisfy a first condition, and send, through the communication unit, a random access request message to the network device in a second SBFD time unit; wherein the first condition is determined according to at least one of the reference signal, the first transmission direction, and a second transmission direction associated with the communication apparatus.

[0312] When the communication apparatus 1800 is configured to implement the function of the network device:

[0313] The communication unit is configured to send, in a first transmission direction, a downlink signal to a second terminal device through a second downlink resource; and send, in the first transmission direction, a reference signal in a first sub-band full duplex (SBFD) time unit.

[0314] The processing unit is configured to receive, through the communication unit, a random access request message from a first terminal device in a second SBFD time unit; wherein the random access request message satisfies a first condition, and the first condition is determined according to at least one of the reference signal, the first transmission direction, and a second transmission direction associated with the first terminal device.

[0315] When the communication apparatus 1800 is configured to implement the function of the network device:

[0316] The processing unit is configured to satisfy a first condition, and determine first indication information; wherein the first indication information is used to indicate that a random access resource is allowed to be used in a sub-band full duplex (SBFD) time unit; and the first condition is determined according to at least one of a measurement value from a first terminal device and a data transmission state of the first terminal device; and the data transmission state of the first terminal device indicates whether a first SBFD time unit is scheduled for the first terminal device to send a downlink signal.

[0317] The communication unit is configured to send the first indication information to the second terminal device.

[0318] When the communication apparatus 1800 is configured to implement the function of the terminal device:

[0319] The communication unit is configured to receive first indication information from a network device; wherein the first indication information is used to indicate that a random access resource is allowed to be used in a sub-band full duplex (SBFD) time unit.

[0320] The processing unit is configured to determine, according to the first indication information, that the random access resource is allowed to be used to send a random access request message to the network device in the SBFD time unit.

[0321] When the communication apparatus 1800 is configured to implement the function of the network device:

[0322] The communication unit is configured to send random access resource configuration information, the random access resource configuration information indicating random access resources;

[0323] The processing unit is configured to send, by the communication unit, first information to the terminal device, the first information indicating that M random access channel occasions corresponding to a first sub-band full-duplex (SBFD) time unit in the random access resources are allowed to be used, M being an integer greater than 0.

[0324] When the communication apparatus 1800 is configured to implement the functions of the terminal device:

[0325] The communication unit is configured to receive random access resource configuration information from the network device, the random access resource configuration information indicating random access resources; the at least one random access resource is located in at least one SBFD time unit.

[0326] The processing unit is configured to receive, by the communication unit, first information from the network device, the first information indicating that M random access channel occasions corresponding to a first SBFD time unit in the random access resources are allowed to be used, M being an integer greater than 0.

[0327] More detailed descriptions of the processing unit 1810 and the communication unit 1820 can be directly obtained by referring to the relevant descriptions in the above method embodiments, and thus will not be repeated here.

[0328] It should be understood that the division of the units in the above apparatus is only a logical functional division, and all or part of the units can be integrated into one physical entity, or can be physically separated. The units in the apparatus can all be implemented in the form of software invoked by a processing element; or all be implemented in the form of hardware; or some units are implemented in the form of software invoked by a processing element, and some units are implemented in the form of hardware. For example, each unit can be a separately established processing element, or can be integrated into a chip of the apparatus, in addition, the unit can also be stored in the form of a program in a memory, and the function of the unit is invoked and executed by a processing element of the apparatus. In addition, all or part of the units can be integrated together, or can be independently implemented. The processing element herein can be a processor, which can be an integrated circuit with a signal processing capability. In the implementation process, each operation of the above method or each unit can be implemented by an integrated logic circuit of hardware in the processing element, or in the form of software invoked by the processing element.

[0329] In one example, the units in any of the above apparatuses can be one or more integrated circuits configured to implement one or more of the above methods, e.g., one or more application specific integrated circuits (ASICs), or, one or more digital singnal processors (DSPs), or, one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms. In another example, when the units in the apparatuses can be implemented in the form of a processing element scheduler, the processing element can be a processor, such as a general purpose central processing unit (CPU), or other processor capable of invoking a program. In yet another example, the units can be integrated together in the form of a system-on-a-chip (SOC).

[0330] The above receiving unit is an interface circuit of the apparatus for receiving signals from other apparatuses. For example, when the apparatus is implemented in the form of a chip, the receiving unit is an interface circuit of the chip for receiving signals from other chips or apparatuses. The above transmitting unit is an interface circuit of the apparatus for transmitting signals to other apparatuses. For example, when the apparatus is implemented in the form of a chip, the transmitting unit is an interface circuit of the chip for transmitting signals to other chips or apparatuses.

[0331] As another possible product form, the terminal device or network device of the embodiments of the present application can be implemented by a general bus architecture. For ease of illustration, refer to FIG. 19, which is a structural schematic diagram of a communication apparatus 1900 provided by the embodiments of the present application, the communication apparatus 1900 including a processor 1901 and a transceiver 1902. The communication apparatus 1900 can be a terminal device, or a chip or chip system therein; or the communication apparatus 1900 can be a network device, or a chip or module therein. FIG. 19 only shows the main components of the communication apparatus 1900. In addition to the processor 1901 and the transceiver 1902, the communication apparatus 1900 can further include a memory 1903, and an input and output apparatus (not shown in the figure).

[0332] Optionally, the processor 1901 is mainly used for processing communication protocol and communication data, and controlling the whole communication device, executing software program, and processing data of the software program. The memory 1903 is mainly used for storing software program and data. The transceiver 1902 can include radio frequency circuit and antenna, and the radio frequency circuit is mainly used for converting baseband signal and radio frequency signal, and processing radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signal in the form of electromagnetic wave. The input and output device, such as touch screen, display screen, keyboard, etc. is mainly used for receiving user input data and outputting data to user.

[0333] Optionally, the processor 1901, the transceiver 1902, and the memory 1903 can be connected through communication bus.

[0334] When the communication device is powered on, the processor 1901 can read the software program in the memory 1903, interpret and execute the instruction of the software program, and process the data of the software program. When it is needed to send data wirelessly, the processor 1901 processes the baseband of the data to be sent, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit processes the baseband signal to radio frequency signal, and transmits the radio frequency signal in the form of electromagnetic wave through the antenna. When data is sent to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal to baseband signal, and outputs the baseband signal to the processor 1901. The processor 1901 converts the baseband signal to data and processes the data.

[0335] In another implementation, the radio frequency circuit and the antenna can be arranged independently of the processor which performs baseband processing, for example, in a distributed scenario, the radio frequency circuit and the antenna can be arranged remotely from the communication device.

[0336] In some embodiments, in the hardware implementation, those skilled in the art can conceive that the above-mentioned communication device 1800 can adopt the form of the communication device 1900 shown in FIG. 19.

[0337] As an example, the function / implementation process of the processing unit 1810 in FIG. 18 can be realized by the processor 1901 in the communication device 1900 shown in FIG. 19 calling computer execution instructions stored in the memory 1903. The function / implementation process of the communication unit 1820 in FIG. 18 can be realized by the transceiver 1902 in the communication device 1900 shown in FIG. 19.

[0338] As another possible product form, the terminal device or network device in the present application can adopt the component structure shown in FIG. 20, or include the components shown in FIG. 20. FIG. 20 is a component structure diagram of a communication device 2000 provided in the present application.

[0339] As shown in FIG. 20, the communication apparatus 2000 includes at least one processor 2001. Optionally, the communication apparatus further includes a communication interface 2002.

[0340] When the program instructions involved are executed in the at least one processor 2001, the communication apparatus 2000 can be caused to implement the method provided by any of the preceding embodiments and any possible design thereof. Alternatively, the processor 2001 is used to implement the method provided by any of the preceding embodiments and any possible design thereof through logic circuit or execution of code instructions.

[0341] The communication interface 2002 can be used to receive program instructions and transmit them to the processor, or the communication interface 2002 can be used for the communication apparatus 2000 to communicate with other communication devices, such as interaction control signaling and / or service data, etc. For example, the communication interface 2002 can be used to receive signals from other devices outside the communication apparatus 2000 and transmit them to the processor 2001, or send signals from the processor 2001 to other communication devices outside the communication apparatus 2000.

[0342] Optionally, the communication interface 2002 can be a code and / or data read-write interface circuit, or the communication interface 2002 can be a signal transmission interface circuit between the communication processor and the transceiver, or a pin of a chip.

[0343] Optionally, the communication apparatus 2000 can further include at least one memory 2003, which can be used to store the program instructions and / or data involved. It should be noted that the memory 2003 can exist independently of the processor 2001, or can be integrated with the processor 2001. The memory 2003 can be located inside the communication apparatus 2000 or outside the communication apparatus 2000, without limitation.

[0344] Optionally, the communication apparatus 2000 can further include a power supply circuit 2004, which can be used to supply power to the processor 2001. The power supply circuit 2004 can be located in the same chip as the processor 2001, or in another chip outside the chip where the processor 2001 is located.

[0345] Optionally, the communication apparatus 2000 can further include a bus, through which various parts of the communication apparatus 2000 can be interconnected.

[0346] In some embodiments, in hardware implementation, those skilled in the art can conceive that the communication apparatus 1800 shown in FIG. 18 can take the form of the communication apparatus 2000 shown in FIG. 20.

[0347] As an example, the function / implementation process of the processing unit 1810 in FIG. 18 can be implemented by invoking computer-executed instructions stored in the memory 2003 by the processor 2001 in the communication apparatus 2000 shown in FIG. 20. The function / implementation process of the communication unit 1820 in FIG. 18 can be implemented by the communication interface 2002 in the communication apparatus 2000 shown in FIG. 20.

[0348] It should be noted that the structure shown in FIG. 20 does not constitute a specific limitation on the terminal device or the network device. For example, in some other embodiments of the present application, the terminal device or the network device can include more or fewer components than those shown, or combine certain components, or split certain components, or different arrangement of components. The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0349] When the communication apparatus is a terminal chip, the terminal chip implements the functions of the terminal in the method embodiments. The terminal chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal, and the information is sent by the base station to the terminal; or the terminal chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal, and the information is sent by the terminal to the base station.

[0350] When the communication apparatus is a base station module, the base station module implements the functions of the base station in the method embodiments. The base station module receives information from other modules (such as a radio frequency module or an antenna) in the base station, and the information is sent by the terminal to the base station; or the base station module sends information to other modules (such as a radio frequency module or an antenna) in the base station, and the information is sent by the base station to the terminal. The base station module here can be a baseband chip of the base station, or a DU or other module, and the DU here can be a DU under the O-RAN architecture.

[0351] It can be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor can be a microprocessor, or any conventional processor.

[0352] The method steps in the embodiments of the present application can be realized by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, which can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium well 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 an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. Of course, the processor and the storage medium can also exist as discrete components in the base station or the terminal.

[0353] In the above embodiments, all or part of the embodiments can be realized by software, hardware, firmware, or any combination thereof. When realized by software, all or part of the embodiments can be realized in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are performed. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable apparatus. The computer programs or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer programs or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center through a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium can be a magnetic medium, for example, a floppy disk, a hard disk, a magnetic tape; an optical medium, for example, a digital video disc; or a semiconductor medium, for example, a solid-state disk. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0354] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and no logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0355] Those skilled in the art will appreciate that embodiments of the present application can be readily used as a method, a system or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage etc.) embodying computer readable program code.

[0356] The present application is described in reference to the flowchart illustrations and / or block diagrams of the methods, apparatus (systems) and computer program products according to the present application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing machine, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams block or blocks.

[0357] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart illustrations and / or block diagrams block or blocks.

[0358] It will be obvious, however, to those having skill in the art that changes can be made in the application without departing from the scope thereof. It is therefore intended that the application not be limited to the exact form described herein, but to cover in scope all modifications that can fall within the scope of the claims or equivalents thereof.

Claims

1. A communication method characterized by comprising: Comprising: receiving, in a first transmission direction, a reference signal from a network device in a first sub-band full duplex (SBFD) time unit; satisfying a first condition, transmitting a random access request message to the network device in a second SBFD time unit; wherein the first condition is determined according to at least one of the reference signal, the first transmission direction, and a second transmission direction associated with the first terminal device.

2. The method of claim 1, wherein, The first condition comprises at least one of: the first transmission direction is the same as the second transmission direction, and a reference signal received power of the reference signal is greater than a threshold value; the first transmission direction is different from the second transmission direction, and the reference signal received power of the reference signal is less than or equal to the threshold value; a deviation of the first transmission direction from the second transmission direction is greater than a threshold.

3. The method according to claim 1 or 2, characterized in that, The reference signal and the random access request message are separated by a first time duration in a time domain, and the first time duration is greater than or equal to a time delay required by the first terminal device for uplink-downlink switching.

4. The method according to any one of claims 1 to 3, characterized in that, The method further comprises: receiving reference signal resource information from the network device, the reference signal resource information indicating at least one resource used for transmitting the reference signal, and one of the resources being associated with at least one transmission direction.

5. The method of claim 4, wherein, The method further comprises: detecting the reference signal in a resource associated with the second transmission direction among the at least one resource.

6. The method according to any one of claims 1 to 5, characterized in that, The second transmission direction is a transmission direction of a synchronization signal block (SSB) selected by the first terminal device.

7. A communication method characterized by comprising: Comprising: transmitting, in a first transmission direction, a downlink signal to a second terminal device through a second downlink resource; transmitting, in the first transmission direction, a reference signal in a first sub-band full duplex (SBFD) time unit; receiving, in a second SBFD time unit, a random access request message from a first terminal device; The random access request message satisfies a first condition, and the first condition is determined according to at least one of the reference signal, the first transmission direction, and a second transmission direction associated with the first terminal device.

8. The method of claim 7, wherein, The reference signal and the random access request message are separated by a first time duration in a time domain, and the first time duration is greater than or equal to a time delay required by the first terminal device for uplink-downlink switching.

9. A communication method characterized by comprising: Comprising: satisfying a first condition, determining first indication information; The first indication information is used to indicate that a random access resource is allowed to be used in a sub-band full duplex (SBFD) time unit; The first condition is determined according to at least one of a measurement value from a first terminal device and a data transmission state of the first terminal device, and the data transmission state of the first terminal device indicates whether a downlink signal is scheduled for the first terminal device in a first SBFD time unit; transmitting the first indication information to the second terminal device.

10. The method of claim 9, wherein, The first condition comprises at least one of: the measurement value from the first terminal device is not received; the measurement value is less than a first threshold value; the measurement value is greater than or equal to the first threshold value, and a downlink signal is not scheduled for the first terminal device in the first SBFD time unit.

11. The method according to claim 9 or 10, characterized in that, The measurement object of the measurement value is a reference signal, and the reference signal is transmitted by the second terminal device.

12. The method of claim 9 or 10, wherein, The method further includes: transmitting reference signal resource configuration information to the second terminal device, the reference signal resource configuration information indicating reference signal resources used for transmitting the reference signal.

13. The method according to any one of claims 9 to 12, characterized in that, The method further includes: transmitting random access resource configuration information to the second terminal device, the random access resource configuration information indicating the random access resources.

14. The method according to any one of claims 9 to 13, characterized in that, The method further includes: satisfying a second condition, transmitting second indication information to the second terminal device; the second indication information is used to indicate that random access resources are not allowed to be used in the SBFD time unit; the second condition includes at least one of the following: the measurement value is greater than or equal to a first threshold; the first SBFD time unit is used to schedule a downlink signal for the first terminal device.

15. A method of communication, comprising: including: receiving first indication information from a network device; The first indication information is used to indicate that random access resources are allowed to be used in a sub-band full-duplex (SBFD) time unit. According to the first indication information, it is determined that the random access request message is allowed to be transmitted to the network device through the random access resources in the SBFD time unit.

16. The method of claim 15, wherein, The first condition includes at least one of the following: The measurement value is not received from the first terminal device; The measurement value is less than a first threshold; The measurement value is greater than or equal to a first threshold, and no downlink signal is scheduled for the first terminal device in the first SBFD time unit.

17. A method of communication, comprising: including: transmitting random access resource configuration information, the random access resource configuration information indicating random access resources; transmitting first information to a terminal device, the first information indicating that M random access channel occasions corresponding to a first sub-band full-duplex (SBFD) time unit in the random access resources are allowed to be used, M being an integer greater than 0.

18. The method of claim 17, wherein, There is no downlink signal transmission in the first SBFD time unit.

19. The method of claim 17 or 18, wherein The first information is transmitted in a first transmission direction; each of the M random access channel occasions is associated with the first transmission direction, and there is no downlink signal transmission in the first transmission direction in the first SBFD time unit.

20. The method of claim 17 or 18, wherein The first information is transmitted in a plurality of transmission directions; each of the M random access channel occasions is associated with the plurality of transmission directions including a first transmission direction, and there is no downlink signal transmission in the first transmission direction in the first SBFD time unit.

21. A method of communication, comprising: including: receiving random access resource configuration information from a network device, the random access resource configuration information indicating random access resources; The at least one random access resource is located in at least one SBFD time unit; receiving first information from a network device, the first information indicating that M random access channel occasions corresponding to a first sub-band full-duplex (SBFD) time unit in the random access resources are allowed to be used, M being an integer greater than 0.

22. A communications device, characterized by including: a communication unit, configured to receive, in a first sub-band full duplex, SBFD, time unit, a reference signal from a network device in a first transmission direction; a processing unit, configured to meet a first condition, and transmit, by the communication unit, a random access request message to the network device in a second SBFD time unit; wherein the first condition is determined according to at least one of the reference signal, the first transmission direction, and a second transmission direction associated with the communication apparatus.

23. A communications device, characterized by comprising: a communication unit, configured to transmit, in a first transmission direction, a downlink signal to a second terminal device by a second downlink resource; transmit, in a first sub-band full duplex, SBFD, time unit, a reference signal in the first transmission direction; a processing unit, configured to receive, by the communication unit, a random access request message from a first terminal device in a second SBFD time unit; the random access request message meets a first condition, and the first condition is determined according to at least one of the reference signal, the first transmission direction, and a second transmission direction associated with the first terminal device.

24. A communications device, characterized by comprising: a processing unit, configured to meet a first condition, and determine first indication information; the first indication information is used to indicate that random access resources are allowed to be used in a sub-band full duplex, SBFD, time unit; the first condition is determined according to at least one of a measurement value from a first terminal device and a data transmission state of the first terminal device; and the data transmission state of the first terminal device indicates whether a downlink signal is scheduled for the first terminal device in a first SBFD time unit; a communication unit, configured to transmit the first indication information to the second terminal device.

25. A communications device, characterized by comprising: a communication unit, configured to receive first indication information from a network device; the first indication information is used to indicate that random access resources are allowed to be used in a sub-band full duplex, SBFD, time unit; a processing unit, configured to determine, according to the first indication information, that a random access request message is allowed to be transmitted to the network device by the random access resources in the SBFD time unit.

26. A communications device, characterized by comprising: a communication unit, configured to transmit random access resource configuration information, the random access resource configuration information indicating random access resources; a processing unit, configured to transmit, by the communication unit, first information to a terminal device, the first information indicating that M random access channel occasions corresponding to a first sub-band full duplex, SBFD, time unit in the random access resources are allowed to be used, M being an integer greater than 0.

27. A communications device, characterized by comprising: a communication unit, configured to receive random access resource configuration information from a network device, the random access resource configuration information indicating random access resources; the at least one random access resource is located in at least one SBFD time unit; a processing unit, configured to receive, by the communication unit, first information from a network device, the first information indicating that M random access channel occasions corresponding to a first sub-band full duplex, SBFD, time unit in the random access resources are allowed to be used, M being an integer greater than 0.

28. A communications device, characterized by comprising a processor; The processor is configured to execute computer programs or instructions stored in the memory, so that the communication device implements the method of any one of claims 1 to 21.

29. A computer-readable storage medium, characterized in that, The computer programs or instructions are stored in the memory, and when the computer programs or instructions are run on the computer, the computer implements the method of any one of claims 1 to 21.

30. A computer program product, characterised in that, When the computer reads and executes the computer program product, the method of any one of claims 1 to 21 is executed.

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