Communication method and apparatus

Abstract

The present application provides a communication method and apparatus for solving a problem in which random access fails due to the bandwidth of a downlink message exceeding the baseband processing capability of a terminal device. The method includes: transmitting a first physical random access channel to a network device; and, if a first random access response corresponding to the first physical random access channel is not received within a first random access response time window, transmitting the first physical random access channel to the network device for a first period, the duration of the first period being longer than the duration of a second period, the second period being used by a second type terminal device to retry random access when a second random access response is not received within the random access response time window, the second random access response being a random access response corresponding to the physical random access channel transmitted by the second type terminal device. If the random access fails, the physical random access channel is retransmitted for the extended first period, thereby increasing the probability of successful random access.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202310146209.8, entitled "Communication Method and Apparatus," filed with the State Intellectual Property Office of the People's Republic of China on February 13, 2023, which is incorporated herein by reference in its entirety.

[0002] The present application relates to the field of communication technologies, and more particularly to communication methods and devices. [Background technology]

[0003] The new radio (NR) standard Rel-18 version is considering further reducing the maximum bandwidth of user equipment (UE). In the Rel-18 version, the maximum radio frequency bandwidth of a UE remains at 20 MHz, and only the baseband bandwidth capabilities of two channels, namely the physical downlink shared channel (PDSCH) and the physical uplink shared channel (PUSCH), are reduced.

[0004] The random access response (RAR) is transmitted within a bandwidth part (BWP), and the maximum bandwidth of the BWP does not exceed the maximum bandwidth of the UE. For UEs prior to the Rel-18 version, the UE's maximum radio frequency bandwidth is equal to the UE's maximum baseband bandwidth. Therefore, the scheduling bandwidth of the RAR is within the range of the UE's radio frequency bandwidth and baseband bandwidth and does not exceed the UE's receiving and processing capabilities. However, for an R18 version UE, the UE's maximum radio frequency bandwidth is 20 MHz and the UE's maximum baseband bandwidth is 5 MHz. Therefore, if the scheduling bandwidth of the RAR for an R18 version UE exceeds 5 MHz, the RAR's bandwidth size exceeds the UE's baseband processing capabilities. As a result, the UE cannot complete processing such as decoding and parsing the RAR, resulting in a random access failure. Summary of the Invention [Means for solving the problem]

[0005] The present application provides a communication method and apparatus for solving the problem of random access failure due to the scheduling bandwidth of downlink messages exceeding the baseband processing capability of a terminal device.

[0006] According to a first aspect, the present application provides a communication method. The method may be performed by a terminal device, or may be performed by a chip or circuit. A terminal device is used as an example. The method includes: transmitting a first physical random access channel to a network device; and, if a first random access response corresponding to the first physical random access channel is not received within a first random access response time window, transmitting the first physical random access channel to the network device within a first period. The duration of the first period is longer than the duration of a second period, the first period corresponding to a first type of terminal device, and the second period used by a second type of terminal device to retry random access when a second random access response is not received within the random access response time window, the second random access response being a random access response corresponding to the physical random access channel transmitted by the second type of terminal device.

[0007] In the present application, if the random access fails, the terminal device may retransmit the physical random access channel for the extended first period, so that the terminal device has more time to process the physical downlink shared channel. Therefore, the probability of successfully receiving (or decoding) the physical downlink shared channel can be increased, and the probability of successful random access can be increased.

[0008] In a possible design, the first random access response corresponding to the first physical random access channel not being received within the first random access response time window may be one of the following scenarios: first downlink control information from the network device is not received within a first random access response time window, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; first downlink control information from the network device is received within a first random access response time window, and the first N bits of a system frame number carried in ascending order in the first downlink control information are different from the first N bits of a system frame number corresponding to a first physical random access channel in ascending order, where N is an integer greater than 0, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; First downlink control information from the network device is received within a first random access response time window, and a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; or First downlink control information is received within a first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, and the first downlink control information is used to schedule a physical downlink shared channel that carries the random access response.

[0009] In the above design, a scenario in which a random access response is not received is not distinguished, and random access is restarted in the first period in any scenario in which a random access response is not received, so that implementation complexity of the terminal device can be reduced.

[0010] In a possible design, the random access response corresponding to the first physical random access channel not being received within the first random access response time window may be one of the following scenarios: First downlink control information from the network device is received within a first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, the bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than the maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; or The first downlink control information is received within a first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, the bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than a maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule the physical downlink shared channel carrying the random access response.

[0011] In the above design, a scenario in which a random access response is not received is distinguished. In a scenario in which the physical downlink shared channel needs to be analyzed (or decoded) or the bandwidth of the physical downlink shared channel is large, the random access is re-executed in a second period having a long duration, so that the terminal device can have more time to process the physical downlink shared channel. Therefore, the probability of successfully receiving (or decoding) the physical downlink shared channel can be increased, and the probability of random access success can be increased.

[0012] In a possible design, the method further includes transmitting a second physical random access channel to the network device; and transmitting the second physical random access channel to the network device in a second time period if one of the following scenarios is met: the second downlink control information is not received within a second random access response time window, and the second downlink control information is used to schedule a physical downlink shared channel carrying the random access response; second downlink control information is received within a second random access response time window, and the first M bits of a system frame number carried in ascending order in the second downlink control information are different from the first M bits of a system frame number corresponding to a second physical random access channel in ascending order, where M is an integer greater than 0, and the second downlink control information is used to schedule a physical downlink shared channel carrying the random access response; The second downlink control information is received within a second random access response time window, a transport block of the physical downlink shared channel scheduled using the second downlink control information is not correctly received, and the bandwidth of the physical downlink shared channel scheduled using the second downlink control information is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device; or The second downlink control information is received within a second random access response time window, a transport block of a physical downlink shared channel scheduled using the second downlink control information is correctly received, the physical downlink shared channel scheduled using the second downlink control information does not carry a random access response corresponding to the second physical random access channel, and the bandwidth of the physical downlink shared channel scheduled using the second downlink control information is less than or equal to a maximum bandwidth of baseband processing of the first type terminal device.

[0013] In the above design, a distinction is made between scenarios in which a random access response is not received, and in scenarios in which the physical downlink shared channel does not need to be analyzed (or decoded) or the bandwidth of the physical downlink shared channel is small, the random access is re-executed in a second period of shorter duration, so that random access latency can be reduced and communication performance can be improved.

[0014] In a possible design, the duration of the first period is (N T,1 +a+X), and the duration of the second period is (N T,1 +a). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

[0015] In a possible design, X is predefined; X is N T,1 X is K times, where K is equal to or greater than 1; or X is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0016] According to the above design, the probability of successful random access can be increased and the random access latency can be reduced.

[0017] In a possible design, the method further includes: if a first random access response from the network device is received within a first random access response time window and a bandwidth of the physical downlink shared channel carrying the first random access response is greater than a maximum bandwidth of baseband processing of the first type terminal device, sending a third message (Msg3) to the network device in a random access procedure after a third period; or if the first random access response is received within the first random access response time window and a bandwidth of the physical downlink shared channel carrying the first random access response is equal to or less than a maximum bandwidth of baseband processing of the first type terminal device, sending Msg3 to the network device in a random access procedure after a fourth period, wherein a duration of the third period is longer than a duration of the fourth period.

[0018] According to the above design, if the bandwidth of the physical downlink shared channel carrying the random access response is larger than the bandwidth of the terminal device, the time for retrying random access is extended, so that the time for decoding the physical downlink shared channel can be extended and the probability of successfully acquiring the information carried on the physical downlink shared channel can be increased, which is helpful in increasing the probability of successfully transmitting Msg3 and improving random access performance.

[0019] In a possible design, the duration of the third period is (N T,1 +N T,2 +b+Y), and the duration of the fourth period is (N T,1 +N T,2 +b). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T,2 Y is the preparation duration of the physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

[0020] In a possible design, Y is predefined, e.g., Y is equal to 1 ms; Y is equal to N T,1 or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0021] According to the above design, the probability of successful transmission of Msg3 can be increased, and the waiting time of transmission of Msg3 can be reduced.

[0022] In a possible design, the method further includes receiving contention resolution information from the network device; and, if a bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than a maximum bandwidth of baseband processing of the first type terminal device, sending an acknowledgment information for the contention resolution information to the network device after a fifth period, or, if the bandwidth of the physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of baseband processing of the first type terminal device, sending an acknowledgment information for the contention resolution information to the network device after a sixth period, wherein a duration of the fifth period is longer than a duration of the sixth period.

[0023] According to the above design, when the bandwidth of the physical downlink shared channel carrying the contention resolution information is larger than the bandwidth of the terminal device, the time for retrying random access is extended, so that the time for decoding the physical downlink shared channel can be extended and the probability of successfully acquiring the contention resolution information can be increased, which is helpful in increasing the probability of successfully transmitting the acknowledgment information of the contention resolution information and improving random access performance.

[0024] In a possible design, the duration of the fifth period is (N T,1 +c+Z), and the duration of the sixth period is (N T,1 +c). N T,1is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

[0025] In a possible design, Z is predefined; Z is N T,1 or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0026] According to the above design, the probability of successfully transmitting the acknowledgment information of the conflict resolution information can be increased, and the latency of transmitting the acknowledgment information of the conflict resolution information can be reduced.

[0027] In a possible design, the start of the first period is the last symbol of the first random access response time window, or the start of the first period is the last symbol of the physical downlink shared channel in the first random access response time window.

[0028] In a possible design, the maximum bandwidth of the baseband processing of the first type terminal device is smaller than the maximum radio frequency bandwidth of the first type terminal device, and the maximum bandwidth of the baseband processing of the second type terminal device is equal to the maximum radio frequency bandwidth of the second type terminal device.

[0029] According to a second aspect, the present application provides a communication method. The method may be performed by a network device, or may be performed by a chip or circuit. A network device is used as an example. The method includes monitoring a first physical random access channel from a terminal device and again monitoring the first physical random access channel from the terminal device for a first period of time. The duration of the first period is longer than the duration of a second period of time, the first period corresponding to a first type of terminal device, and the second period of time is used by a second type of terminal device to retry random access when a second random access response is not received within a random access response time window, the second random access response being a random access response corresponding to the physical random access channel transmitted by the second type of terminal device.

[0030] In the present application, if the random access fails, the terminal device may retransmit the physical random access channel for the extended first period, so that the terminal device has more time to process the physical downlink shared channel. Therefore, the probability of successfully receiving (or decoding) the physical downlink shared channel can be increased, and the probability of successful random access can be increased.

[0031] In a possible design, the method further includes transmitting a first physical downlink shared channel to the terminal device within a first random access response time window, where the first physical downlink shared channel is used to carry the random access response, and the bandwidth of the first physical downlink shared channel is greater than a maximum bandwidth of baseband processing of the first type terminal device.

[0032] In a possible design, the method includes monitoring a second physical random access channel from the terminal device; transmitting a second physical downlink shared channel to the terminal device within a second random access response time window, where a bandwidth of the second physical downlink shared channel is less than or equal to a maximum bandwidth of baseband processing of the first type terminal device, and the second physical downlink shared channel is used to carry the random access response; and again monitoring the second physical random access channel from the terminal device in a second period.

[0033] According to the above design, the random access latency can be reduced to improve communication performance.

[0034] In a possible design, the duration of the first period is (N T,1 +a+X), and the duration of the second period is (N T,1 +a). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

[0035] In a possible design, X is predefined; X is N T,1 X is K times, where K is equal to or greater than 1; or X is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0036] According to the above design, the probability of successful random access can be increased and the random access latency can be reduced.

[0037] In a possible design, the method further includes transmitting a random access response on a first physical random access channel to the terminal device; and receiving a third message Msg3 from the terminal device in the random access procedure after a third period if the bandwidth of the physical downlink shared channel carrying the random access response is greater than a maximum bandwidth of baseband processing of the first type terminal device, or receiving a third message Msg3 from the terminal device in the random access procedure after a fourth period if the bandwidth of the physical downlink shared channel carrying the random access response is equal to or less than the maximum bandwidth of baseband processing of the first type terminal device, wherein the duration of the third period is longer than the duration of the fourth period.

[0038] The above design helps to increase the probability of successful reception of Msg3 and improve random access performance.

[0039] In a possible design, the duration of the third period is (N T,1 +N T,2 +b+Y), and the duration of the fourth period is (N T,1 +N T,2 +b). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T,2 Y is the preparation duration of the physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

[0040] In a possible design, Y is predefined, e.g., Y is equal to 1 ms; Y is equal to N T,1 or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0041] According to the above design, the probability of successfully receiving Msg3 can be increased, and the waiting time for receiving Msg3 can be reduced.

[0042] In one possible design, the method includes transmitting contention resolution information to a terminal device, and receiving, from the terminal device, an acknowledgement for the contention resolution information after a fifth period if the bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than a maximum bandwidth of baseband processing of the first type terminal device, or receiving, from the terminal device, an acknowledgement for the contention resolution information after a sixth period if the bandwidth of the physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of baseband processing of the first type terminal device, wherein the duration of the fifth period is longer than the duration of the sixth period, the fifth period corresponds to the first type terminal device, and the sixth period corresponds to either the first type terminal device or the second type terminal device.

[0043] The above design helps to increase the probability of successfully receiving the acknowledgement information of the contention resolution information and improve the random access performance.

[0044] In a possible design, the duration of the fifth period is (N T,1 +c+Z), and the duration of the sixth period is (N T,1 +c). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

[0045] In a possible design, Z is predefined; Z is N T,1 or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0046] According to the above design, the probability of successfully receiving the acknowledgement information of the conflict resolution information can be increased, and the waiting time of receiving the acknowledgement information of the conflict resolution information can be reduced.

[0047] In a possible design, the start of the first period is the last symbol of the first random access response time window, or the start of the first period is the last symbol of the physical downlink shared channel in the first random access response time window.

[0048] In a possible design, the maximum bandwidth of the baseband processing of the first type terminal device is smaller than the maximum radio frequency bandwidth of the first type terminal device, and the maximum bandwidth of the baseband processing of the second type terminal device is equal to the maximum radio frequency bandwidth of the second type terminal device.

[0049] According to a third aspect, the present application further provides a communication device. The communication device performs any of the methods according to the first aspect. The communication device may be implemented by hardware or by executing corresponding software by hardware. The hardware or software may include one or more units or modules corresponding to the aforementioned functions.

[0050] In a possible design, the communication device includes a processor configured to support the communication device in performing corresponding functions of the terminal device in the aforementioned manner. The communication device may further include a memory. The memory may be coupled to the processor, and the memory stores program instructions and data required for the communication device. Optionally, the communication device further includes an interface circuit. The interface circuit is configured to support communication between the communication device and the network device.

[0051] For example, a communications apparatus may have functionality to implement a method according to a first aspect, and a processor may be configured to transmit a first physical random access channel to a network device via an interface circuit, and if a first random access response corresponding to the first physical random access channel is not received within a first random access response time window, transmit the first physical random access channel to the network device within a first period via the interface circuit.

[0052] In a possible design, the communication device includes corresponding functional modules separately configured to perform the steps of the aforementioned methods. The functions may be implemented by hardware or by the hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the aforementioned functions.

[0053] In a possible design, the structure of the communication device includes a processing unit (or processing module) and a communication unit (or communication module). These units may perform corresponding functions in the above-mentioned method examples. For details, please refer to the description of the method according to the first aspect. Details will not be repeated here.

[0054] For example, a communication device has functionality for implementing a method according to a first aspect, wherein the processing unit is configured to transmit a first physical random access channel to a network device via the communication unit, and, if a first random access response corresponding to the first physical random access channel is not received within a first random access response time window, transmit the first physical random access channel to the network device via the communication unit within a first period.

[0055] According to a fourth aspect, the present application further provides a communication device. The communication device has a function of performing any method according to the second aspect. The communication device may be implemented by hardware or by executing corresponding software by hardware. The hardware or software may include one or more units or modules corresponding to the aforementioned functions.

[0056] In a possible design, the communication device includes a processor configured to support the communication device in performing the corresponding functions of the reader / writer in the manner described above. The communication device may further include a memory. The memory may be coupled to the processor, and the memory stores program instructions and data required by the communication device. Optionally, the communication device further includes an interface circuit. The interface circuit is configured to support communication between the communication device and a device such as a terminal device.

[0057] For example, a communications device may have functionality to implement the method according to the second aspect, and a processor may be configured to monitor a first physical random access channel from a terminal device via an interface circuit, and to monitor the first physical random access channel from the terminal device again during a first period via the interface circuit.

[0058] In a possible design, the communication device includes corresponding functional modules separately configured to perform the steps of the aforementioned methods. The functions may be implemented by hardware or by the hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the aforementioned functions.

[0059] In a possible design, the structure of the communication device includes a processing unit (or a processing module) and a communication unit (or a first communication module). These units may perform corresponding functions in the above-mentioned method examples. For details, please refer to the description of the method according to the second aspect. Details will not be repeated here.

[0060] For example, a communication device may have functionality to implement the method according to the second aspect, and the processing unit may be configured to monitor a first physical random access channel from a terminal device via the communication unit, and to monitor the first physical random access channel from the terminal device again in a first period via the communication unit.

[0061] According to a fifth aspect, there is provided a communication device. The communication device includes a processor and an interface circuit. The interface circuit is configured to receive a signal from a communication device other than the communication device and transmit the signal to the processor, or transmit a signal from the processor to the communication device other than the communication device. The processor is configured to implement the method of the first aspect and any one of possible designs via logic circuits or by executing code instructions.

[0062] According to a sixth aspect, there is provided a communication device. The communication device includes a processor and an interface circuit. The interface circuit is configured to receive a signal from a communication device other than the communication device and transmit the signal to the processor, or transmit a signal from the processor to the communication device other than the communication device. The processor is configured to implement the method of the second aspect and any one of possible designs via logic circuits or by executing code instructions.

[0063] According to a seventh aspect, there is provided a computer-readable storage medium having stored thereon a computer program or instructions which, when executed by a processor, implements the method of the first or second aspect and any one of possible designs.

[0064] According to an eighth aspect, there is provided a computer program product storing instructions which, when executed by a processor, perform the method of the first aspect or the second aspect and any one of possible designs.

[0065] According to a ninth aspect, there is provided a chip system. The chip system may include a processor and may further include a memory configured to implement the method of any one of the first or second aspects and possible designs. The chip system may include a chip, or may include a chip and another individual component.

[0066] According to a tenth aspect, there is provided a communication system, the system including an apparatus (e.g., a terminal device) according to the first aspect and an apparatus (e.g., a network device) according to the second aspect. [Brief explanation of the drawings]

[0067] [Figure 1] 1 is a schematic flowchart of a four-step random access according to an embodiment of the present application; [Figure 2] 1 is a schematic flowchart of two-step random access according to an embodiment of the present application; [Figure 3] FIG. 1 is a diagram of the architecture of a network system according to an embodiment of the present application. [Figure 4] 1 is a diagram of a connection between a terminal device and a network device according to an embodiment of the present application. [Figure 5] 1 is a schematic flowchart of a communication method according to an embodiment of the present application; [Figure 6] 1 is a diagram of the structure of a communication device according to an embodiment of the present application; [Figure 7] 1 is a diagram of the structure of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0068] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following further describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0069] (1) A terminal device may be a device with wireless transceiver functionality or a chip that can be disposed in any device, and may also be referred to as user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user equipment. In embodiments of the present application, the terminal device may be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver functionality, an XR device (e.g., a VR device, an AR device, or an MR device), a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in video surveillance, a wearable terminal device, or the like. Alternatively, the terminal device may be an eMBB UE, a URLLC UE, an unmanned aerial vehicle, another Internet of Things (IoT) device, a positioning device, or the like.

[0070] The network device may be a device configured to implement the functions of an access network device. The access network device may be a device that communicates with wireless terminal devices over an air interface in an access network by using one or more cells. For example, the access network device may be a next generation NodeB (gNB) in an NR system or an evolved NodeB (eNB) in a long term evolution (LTE) system. Alternatively, the network device may be a device, such as a chip system, that can support the network device in implementing the functions of the access network device. The device may be installed within the network device.

[0071] (2) The embodiments of the present application relate to two types of terminal devices, namely, a first type terminal device and a second type terminal device. The maximum bandwidth of the baseband processing of the first type terminal device is different from the maximum radio frequency bandwidth of the first type terminal device. For example, the maximum bandwidth of the baseband processing of the first type terminal device may be smaller than the maximum radio frequency bandwidth of the first type terminal device. For example, the maximum radio frequency bandwidth of the first type terminal device is 20 MHz, and the maximum bandwidth of the baseband processing is 5 MHz.

[0072] The maximum bandwidth of the baseband processing of the second type terminal device is equal to the maximum radio frequency bandwidth of the second type terminal device. The maximum radio frequency bandwidth of the first type terminal device may be smaller than the maximum radio frequency bandwidth of the second type terminal device, or the maximum radio frequency bandwidth of the first type terminal device may be equal to the maximum radio frequency bandwidth of the second type terminal device. This is not particularly limited in the present application.

[0073] For example, the first type of terminal device may be a terminal device of NR Rel-18 or a later version. In one example description, the first type of terminal device may be understood as a terminal device whose capabilities are further reduced based on the second type of terminal device. For example, the baseband processing capabilities of the first type of terminal device are reduced compared to the second type of terminal device.

[0074] The second type of terminal device may be a legacy terminal device (legacy UE), for example an enhanced Mobile Broadband (eMBB) terminal device or an ultra-reliable low-latency communication (URLLC) terminal device. The second type of terminal device may alternatively be a reduced capability (RedCap) terminal device (RedCap UE). A RedCap UE may be understood as a terminal device whose capabilities are reduced compared to a legacy terminal device (legacy UE).

[0075] Differences between legacy UE and RedCap UE include at least one of the following:

[0076] 1. Bandwidth capabilities vary. The maximum bandwidth supported by a legacy UE may be greater than the maximum bandwidth supported by a RedCap UE. For example, a legacy UE may support communication with network devices by simultaneously using up to 100 MHz of frequency domain resources on one carrier, while a RedCap UE may support communication with network devices by simultaneously using up to 20 MHz, 10 MHz, or 5 MHz of frequency domain resources on one carrier.

[0077] 2. The number of transceiver antennas is different. The antenna configuration of a legacy UE may be larger than the antenna configuration of a RedCap UE. For example, the minimum antenna configuration supported by a legacy UE may be larger than the maximum antenna configuration supported by a RedCap UE. For example, the minimum antenna configuration supported by a legacy UE may be 4T2R. Specifically, in the minimum antenna configuration, four receive antennas are used to receive downlink signals and two transmit antennas are used to transmit uplink signals. The maximum antenna configuration supported by a RedCap UE may be lower than 4T2R. For example, a RedCap UE may support only 1T2R or 2T2R.

[0078] 3. The maximum uplink transmission power is different. The maximum uplink transmission power of a legacy UE may be greater than that of a RedCap UE. For example, the maximum uplink transmission power of a legacy UE may be 23 dBm or 26 dBm, while the maximum uplink transmission power of a RedCap UE may only be between 4 dBm and 20 dBm.

[0079] 4. Legacy UE and RedCap UE support different protocol versions. For example, NR Rel-15 and NR Rel-16 terminal devices may be considered legacy UEs, and RedCap UEs may be considered NR Rel-17 terminal devices.

[0080] 5. The legacy UE and the RedCap UE support different carrier aggregation (CA) capabilities. For example, the legacy UE may support carrier aggregation, but the RedCap UE does not support carrier aggregation. In another example, both the RedCap UE and the legacy UE support carrier aggregation, but the maximum number of carriers for simultaneous aggregation by the legacy UE is greater than the maximum number of carriers for simultaneous aggregation by the RedCap UE. For example, the legacy UE may support aggregation of up to five carriers or 32 carriers simultaneously, while the RedCap UE supports aggregation of up to two carriers simultaneously.

[0081] 6. Legacy UE and RedCap UE have different frequency division duplex (FDD) capabilities, for example, legacy UE may support full-duplex FDD, while RedCap UE may only support half-duplex FDD.

[0082] 7. The RedCap UE and the legacy UE have different data processing time capabilities. For example, the minimum latency between receiving downlink data by the legacy UE and sending feedback on the downlink data is shorter than the minimum latency between receiving downlink data by the RedCap UE and sending feedback on the downlink data, and / or the minimum latency between sending uplink data by the legacy UE and receiving feedback on the uplink data is shorter than the minimum latency between sending uplink data by the RedCap UE and receiving feedback on the uplink data.

[0083] 8. Legacy UE and RedCap UE have different processing capabilities.

[0084] 9. Legacy UE and RedCap UE support different uplink and / or downlink peak transmission rates.

[0085] It should be noted that the first type of terminal device may also be referred to as a RedCap UE. In the following embodiments, in order to distinguish between the first type of terminal device and the RedCap UE in the second type of terminal device, the RedCap UE in the second type of terminal device is referred to as a terminal device in NR Rel-17.

[0086] (3) Baseband bandwidth (BB Bandwidth)

[0087] In an NR system, the signal processing section of a terminal device includes a radio frequency processing unit and a baseband processing unit. The baseband processing unit may include functional modules such as a digital-to-analog converter (ADC) / analog-to-digital converter (DAC), a fast Fourier transform (FFT) / inverse fast Fourier transform (IFFT), post-FFT data buffering, a receiving processing block, low-density pair (LDPC) decoding, a hybrid automatic repeat request (HARQ) buffer, a downlink control processing and decoder, an uplink processing block (UL processing), a MIMO-specific processing block, and a synchronization / cell search block. Different terminal devices may have different software and hardware implementations, and may also have different support and implementations for the aforementioned baseband functional modules. This is not a limitation in the present application. The baseband bandwidth capability of a terminal device may be understood as the bandwidth capability of all or some of the functional blocks in the aforementioned radio frequency functional blocks and baseband module.

[0088] Currently, a terminal device may have different baseband processing capabilities for different channels. For example, for a data channel (e.g., PDSCH and PUSCH), the baseband processing bandwidth of the RedCap terminal device is 5 MHz, and for another physical channel or signal, the baseband processing capability of the RedCap terminal device is 20 MHz. Furthermore, for a data channel, the bandwidth of the post-FFT data buffering in the baseband processing module of the terminal device may be different from the bandwidth of another baseband module. For example, the bandwidth of the post-FFT data buffering is 20 MHz, and the bandwidth of another baseband module is 5 MHz.

[0089] (4) Radio frequency bandwidth (RF bandwidth)

[0090] The radio frequency processing unit may include functional modules such as an antenna array, a power amplifier, a filter, a transmitter, a duplexer, or a converter, and is configured to transmit and receive information. The software and hardware implementations of different terminal devices may be different, and the support and implementation of the aforementioned radio frequency functional modules may also be different. This is not limited in this application.

[0091] (5) The random access procedure includes a contention-based random access (CBRA) procedure and a contention-free random access (CFRA) procedure. The CBRA procedure is described below.

[0092] The CBRA procedure can be completed by a four-step random access channel (RACH) or a two-step RACH.

[0093] See Figure 1. The four-step RACH procedure includes the following steps:

[0094] S11: The terminal device sends a random access request message to the network device, and the network device receives the random access request message from the terminal device. The random access request message may be referred to as Message 1 (Msg1) and includes a random access preamble.

[0095] S12: The network device sends a random access response (RAR) message to the terminal device, and the terminal device receives the RAR message from the network device. The RAR message may also be referred to as Message 2 (Msg2).

[0096] S13: The terminal device sends scheduled transmission information to the network device, and the network device receives the scheduled transmission information from the terminal device. The message carrying the scheduled transmission information is called Message 3 (Msg3).

[0097] After receiving the RAR message, the terminal device performs message transmission based on the scheduling of the RAR message. Specifically, the terminal device may transmit Msg3 via a physical uplink shared channel (PUSCH) scheduled using an RAR uplink grant (RAR UL grant) carried in the first RAR.

[0098] S14: The network device sends contention resolution information to the terminal device, and the message carrying the contention resolution information is called Message 4 (Msg4). The terminal device can obtain the contention resolution information by receiving Msg4 from the network device.

[0099] The four-step RACH has been described above. The two-step RACH will be described below. Please refer to Figure 2. The two-step RACH includes the following steps:

[0100] S21: The terminal device sends a message A (MsgA) to the network device, and the network device receives MsgA from the terminal device.

[0101] The terminal device selects an MsgA resource from the common MsgA resources broadcast by the network device and transmits MsgA on the MsgA resource. The MsgA resource includes a resource (time-frequency code) used to transmit a preamble and a corresponding PUSCH resource. The MsgA also includes two parts: a preamble and a PUSCH payload.

[0102] Message MsgA can be considered to include the preamble and content included in Msg3 in the four-step RACH.

[0103] S22: The network device sends a message B (MsgB) to the terminal device, and the terminal device receives MsgB from the network device.

[0104] The MsgB may include contention resolution information and may include the content included in the RAR message in the 4-step RACH.

[0105] In the embodiments of the present application, the terms "system" and "network" may be used interchangeably. In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The term "and / or" describes a relationship between related entities and indicates that three relationships may exist. For example, A and / or B may represent the following cases: when only A is present, when both A and B are present, and when only B is present, and A and B may be singular or plural. The character " / " generally indicates an "or" relationship between related entities. "At least one of the following items (moieties)" or similar expressions refers to any combination of these items, including one item (moiety) or any combination of multiple items (moieties). For example, "at least one of a, b, or c" may refer to a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c may be singular or plural.

[0106] In addition, unless otherwise specified, ordinal numbers such as "first" and "second" referred to in the embodiments of the present application are used to distinguish between multiple objects, and are not used to limit the size, content, order, time sequence, priority, importance, etc. of the multiple objects. For example, the first physical random access channel and the second physical random access channel are only used to distinguish between different physical random access channels, and do not indicate different transmission sequences, content, priority, importance, etc. of the two physical random access channels.

[0107] In an embodiment of the present application, the baseband bandwidth capability of a terminal device may also be described as "baseband processing capability," "maximum baseband bandwidth," "baseband maximum bandwidth," "maximum baseband processing bandwidth," "maximum baseband processing bandwidth," etc.

[0108] The radio frequency bandwidth capability of a terminal device may also be described as "radio frequency capability," "maximum radio frequency bandwidth," "radio frequency maximum bandwidth," "radio frequency maximum bandwidth," or the like.

[0109] The above describes some noun concepts used in the embodiments of the present application. The following describes technical features of the embodiments of the present application.

[0110] The bandwidth capability of eMBB terminal devices, such as terminal devices in Rel-15 / Rel-16, is 100 MHz. RedCap UEs were introduced in Rel-17, reducing the bandwidth capability of RedCap UEs compared to Rel-15 / Rel-16 terminals. The maximum bandwidth supported by RedCap UEs in the FR1 frequency band is reduced to 20 MHz. This significantly reduces terminal costs. Currently, the Rel-18 version of the NR standard is considering further reducing the maximum bandwidth of terminal devices. In the Rel-18 version, the uplink and downlink radio frequency bandwidth capabilities of terminal devices remain at 20 MHz, and only the baseband bandwidth capabilities of two channels, namely the physical downlink shared channel (PDSCH) and the physical uplink shared channel (PUSCH), are reduced. The 20 MHz baseband bandwidth capability is still maintained for other uplink and downlink physical channels and signals.

[0111] The current NR protocol stipulates that the bandwidth of the bandwidth part (BWP) configured by a network device for a UE cannot exceed the UE's maximum bandwidth. For a Rel-18 version terminal device, the maximum bandwidth of the BWP can be configured as 20 MHz. The baseband bandwidth capability of the PDSCH and PUSCH channels in a Rel-18 version terminal device is only 5 MHz. RAR transmission is performed within the BWP range, and the maximum bandwidth of the BWP does not exceed the UE's maximum bandwidth. For UEs prior to the Rel-18 version, the UE's maximum radio frequency bandwidth is equal to the UE's maximum baseband bandwidth. Therefore, the RAR scheduling bandwidth can be considered to be within the UE's radio frequency bandwidth and baseband bandwidth and not exceed the UE's reception and processing capabilities. However, for an Rel-18 version UE, the UE's maximum radio frequency bandwidth is 20 MHz and the UE's maximum baseband bandwidth is 5 MHz. Therefore, if the RAR scheduling bandwidth of an Rel-18 version UE exceeds 5 MHz, the RAR bandwidth size will exceed the UE's baseband processing capability. As a result, the UE cannot complete processes such as decoding and parsing the RAR, causing a random access failure.

[0112] Based on this, the embodiments of the present application provide a communication method and apparatus for solving the problem of random access failure due to the scheduling bandwidth of downlink messages exceeding the baseband processing capability of a terminal device. The method and apparatus are based on the same inventive concept. Since the method and apparatus have similar problem-solving principles, the implementation of the apparatus and the implementation of the method should refer to each other. Repeated parts will not be described again.

[0113] The communication method provided in the present application may be applied to various communication systems, such as the Internet of Things (IoT), narrowband Internet of Things (NB-IoT), long-term evolution (LTE) systems, fifth-generation (5G) communication systems, LTE and 5G hybrid architectures, 5G new radio (NR) systems, and 6G systems or new communication systems emerging in future communication developments. The 5G communication system of the present application may include at least one of a non-standalone (NSA) 5G communication system and a standalone (SA) 5G communication system. The communication system may alternatively be a machine-to-machine (M2M) network or another network.

[0114] The network device and the terminal device may communicate with each other using a licensed spectrum, may communicate with each other using an unlicensed spectrum, or may communicate with each other using both the licensed spectrum and the unlicensed spectrum. The network device and the terminal device may communicate with each other by using a sub-6G spectrum, may communicate with each other by using an over-6G spectrum, or may communicate with each other by using both the sub-6G spectrum and the over-6G spectrum. The spectrum resources used between the network device and the terminal device are not limited in the embodiments of the present application.

[0115] FIG. 3 illustrates a communication system according to an embodiment of the present application. The communication system includes a network device and six terminal devices, namely, UE1 to UE6. In the communication system, UE1 to UE6 may transmit uplink data to the network device, and the network device may receive the uplink data transmitted by UE1 to UE6. In addition, UE4 to UE6 may form a communication subsystem. The network device may transmit downlink information to UE1, UE2, UE3, and UE5, and UE5 may transmit downlink information to UE4 and UE6 based on a device-to-device (D2D) technology. FIG. 3 is merely a diagram, and the type of the communication system, the number of devices included in the communication system, the types of devices included in the communication system, etc. are not particularly limited.

[0116] For example, the network device and the terminal device may be connected via an air interface. For example, the connection relationship between the network device and the terminal device may be shown in FIG.

[0117] The embodiments of the present application may be applied to a communication system serving terminal devices of a first type. It is clear that the embodiments of the present application may also be applied to a communication system serving both terminal devices of a first type and terminal devices of a second type.

[0118] The network architectures and service scenarios described in the embodiments of the present application are intended to more clearly explain the technical solutions in the embodiments of the present application, and do not constitute limitations on the technical solutions provided in the embodiments of the present application. Those skilled in the art can know that with the evolution of network architectures and the emergence of new service scenarios, the technical solutions provided in the embodiments of the present application can also be applied to similar technical problems.

[0119] The following uses a four-step RACH as an example to describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. For ease of description, the following uses an example in which the method is performed by a network device and a terminal device.

[0120] 5 is a schematic flowchart of a communication method according to the present application. The method includes the following steps:

[0121] S501: A terminal device transmits a first PRACH to a network device.

[0122] Correspondingly, the network device may monitor the first PRACH from the terminal device. The network device may detect the first PRACH through monitoring, or may not detect the first PRACH through monitoring. In this application, the monitoring result of the network device is not limited.

[0123] Optionally, when the network device detects the first PRACH through monitoring, the network device may send a first RAR corresponding to the first PRACH to the terminal device, or may not send the first RAR corresponding to the first PRACH, which is not particularly limited in the present application.

[0124] The terminal device may be a first type of terminal device.

[0125] The first PRACH may carry a preamble.

[0126] Optionally, before transmitting the first PRACH, the terminal device may obtain parameters of the first PRACH transmission, such as a preamble format of the first PRACH transmission, time domain resources occupied by the first PRACH transmission, frequency domain resources occupied by the first PRACH transmission, and preamble sequence-related parameters.

[0127] For example, the PRACH resources of the first type terminal device may be the same as the PRACH resources of the legacy UE, or may be different from the PRACH resources of the terminal device in NR Rel-17.

[0128] Alternatively, the PRACH resources of the first type terminal device may be different from the PRACH resources of the legacy UE or may be the same as the PRACH resources of the terminal device in NR Rel-17.

[0129] Alternatively, the PRACH resources of the first type terminal device may be different from the PRACH resources of terminal devices in legacy UE and NR Rel-17.

[0130] For details about NR Rel-17 terminal devices and legacy UEs in the embodiments of the present application, please refer to the relevant description of the second type of terminal device in the above terminology introduction (2).

[0131] It should be noted that the same PRACH resources may be understood as meaning that the time domain resources occupied by the PRACH transmissions, the frequency domain resources occupied by the PRACH transmissions, and the corresponding preamble resources (e.g., preamble formats and preamble sequence-related parameters) are completely the same. Different PRACH resources mean that at least one of the time domain resources occupied by the PRACH transmissions, the frequency domain resources occupied by the PRACH transmissions, and the corresponding preamble resources is different.

[0132] As mentioned above, the PRACH resources for the first type of terminal device are different from the PRACH resources for legacy UEs and / or terminal devices in NR Rel-17, which helps the network device to use the PRACH resources to identify the first type of terminal device and perform some dedicated resource scheduling for the first type of terminal device.

[0133] In an optional solution, the initial uplink BWP used by the first type terminal device to transmit the first PRACH may be an initial uplink BWP for legacy UEs, an initial uplink BWP dedicated to NR Rel-17 terminal devices, or an initial uplink BWP dedicated to the first type terminal device. The initial uplink BWP dedicated to the first type terminal device may be specifically configured by the network device for the first type terminal device using system information block 1 (SIB1), radio resource control (RRC) signaling, etc. Alternatively, the initial uplink BWP dedicated to the first type terminal device may be predefined or determined according to a predefined rule.

[0134] It should be noted that the above-described contents regarding PRACH transmission (eg, PRACH resources and initial uplink BWP used by PRACH) may be implemented independently without relying on the method of FIG.

[0135] In one possible implementation, after transmitting a first PRACH, the terminal device may monitor a first RAR corresponding to the first PRACH.

[0136] In one specific implementation, the terminal device monitors or detects first downlink control information (DCI) within a first RAR time window, where the first DCI is used to schedule a physical downlink shared channel (PDSCH) carrying the RAR. The first DCI may be DCI format 1_0 with a cyclic redundancy check (CRC) scrambled by a corresponding random access-radio network temporary identifier (RA-RNTI). The RA-RNTI may be determined based on a PRACH (i.e., the first PRACH) transmitted by the terminal device.

[0137] The RAR time window may also be referred to as an RAR window. For example, the first RAR time window may also be referred to as the first RAR window, and the following second RAR time window may also be referred to as the second RAR window.

[0138] The start of the RAR time window is located at the first symbol of the earliest control-resource set (CORESET) of the PDCCH on which a Type 1 (Type 1) physical downlink control channel (PDCCH) common search space (CSS) set (CSS set) is configured for the terminal device, and the start of the RAR time window is at least one symbol after the last symbol of the PRACH opportunity corresponding to the PRACH transmission. The Type 1-PDCCH CSS set is used to monitor DCI scrambled by the RA-RNTI or MsgB-RNTI. For example, the start of the first RAR time window is located at the first symbol of the earliest CORESET of the PDCCH on which a Type 1-PDCCH CSS set is configured for the terminal device, and the start of the first RAR time window is at least one symbol after the last symbol of the PRACH opportunity corresponding to the first PRACH transmission.

[0139] The Type1-PDCCH CSS set may be a Type1-PDCCH CSS set for a legacy UE, a Type1-PDCCH CSS set for a terminal device in NR Rel-17, or a Type1-PDCCH CSS set dedicated to a first type of terminal device. The Type1-PDCCH CSS set dedicated to a first type of terminal device may be a dedicated Type1-PDCCH CSS set additionally configured for the first type of terminal device or defined for the first type of terminal device.

[0140] Optionally, the terminal device monitoring or detecting the first RAR in the initial downlink BWP may also be understood as the transmission of the first RAR in the initial downlink BWP. The initial downlink BWP may be an initial downlink BWP defined by the frequency domain resources of CORESET#0, an initial downlink BWP dedicated to the terminal device in NR Rel-17, or a dedicated initial downlink BWP additionally configured for the first type of terminal device. The initial downlink BWP dedicated to the first type of terminal device may be specifically configured by the network device for the first type of terminal device using SIB1, RRC signaling, etc. Alternatively, the initial downlink BWP dedicated to the first type of terminal device may be predefined or determined according to a predefined rule.

[0141] In the present application, the first RAR time window may be an existing random access response window, such as the RAR time window of a legacy UE or the RAR time window of a terminal device in NR Rel-17. Alternatively, the first RAR time window may be an RAR time window dedicated to a first type of terminal device. The RAR time window dedicated to a first type of terminal device may be an RAR time window additionally configured for the first type of terminal device or defined for the first type of terminal device. The parameters of the RAR time window dedicated to the first type of terminal device may be configured by the network device using SIB or RRC signaling, and the start position and / or length of the RAR time window may be different from the start position and / or length of an existing RAR time window. For example, the length of the RAR time window dedicated to the first type of terminal device may be longer than the length of the existing RAR time window.

[0142] It should be noted that the above-mentioned contents regarding RAR transmission (e.g., Type1-PDCCH CSS set, initial downlink BWP for monitoring RAR, and RAR time window) may be realized independently without relying on the method of FIG. 5.

[0143] S502: If the first RAR is not received within the first RAR time window, the terminal device transmits a first PRACH to the network device in a first period. In other words, the random access is restarted in the first period.

[0144] In response, the network device again monitors the first PRACH for the first period of time.

[0145] The duration of the first period is longer than the duration of the second period. The first period is used by a first type terminal device to retry random access if an RAR is not received within an RAR time window, where the RAR is an RAR corresponding to a PRACH transmitted by the first type terminal device. The first period corresponds to the first type terminal device.

[0146] The second period is used by the second type terminal device to re-perform random access if an RAR is not received within the RAR time window, and the RAR is an RAR corresponding to the PRACH transmitted by the second type terminal device.

[0147] In the illustrative example, the start of the first period is the last symbol of the first RAR time window, or the start of the first period is the last symbol of the PDSCH in the first RAR time window.

[0148] The start of the second period may be the last symbol of the first RAR time window, or the start of the second period may be the last symbol of the PDSCH in the first RAR time window.

[0149] In one example, the duration of the first period is (N T,1 +a+X), and the duration of the second period is (N T,1 +a). N T,1 is the processing duration of the PDSCH of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value. For example, a may be 0.75. N T,1 For specific values ​​of N, see Chapter 8.2 of 3GPP (registered trademark) TS 38.213 Release 17.4.0. T,1 is the duration of N1 OFDM symbols corresponding to the PDSCH processing time of UE processing capability 1. For the specific value of N1, please refer to the description of N1 in Chapter 5.3 of 3GPP TS 38.214 Release 17.4.0. Details will not be repeated here.

[0150] It should be noted that in a specific implementation, the expression format of the duration of the first period is not limited to three values, or may be two values. For example, X and a can be combined, that is, the duration of the first period is (N T,1 +A), and A=a+X. Or, X and N T,1 and can be combined, i.e., the duration of the first period is (N1+a), where N1=N T,1 +X. The duration of the first period can alternatively be expressed as (N T,1 +a+X) are possible and are not to be enumerated one by one here.

[0151] Optionally, the durations in this application, such as the duration of the first period, the duration of the second period, the duration of the third period, the duration of the fourth period, the duration of the fifth period, and the duration of the sixth period, may be in units of symbols. For example, the duration of the first period may be (N T,1 +a+X) symbols, and the duration of the second period is (N T,1 +a) symbol. N T,1is the number of symbols corresponding to processing the PDSCH by the first type terminal device or the second type terminal device.

[0152] Alternatively, the duration in this application may be in units of time (e.g., milliseconds or seconds). For example, the duration of the first period may be (N T,1 +a+X) milliseconds, and the duration of the second period is (N T,1 + a) milliseconds. N T,1 is the duration of processing the PDSCH by the first type terminal device or the second type terminal device.

[0153] For example, X may be predefined. For example, X is a predefined value. For example, X is 1 ms.

[0154] Or, X is N T,1 , where K is equal to or greater than 1. For example, K is equal to 1. For example, K is equal to 1. This corresponds to the doubling time for the terminal to process the PDSCH.

[0155] Alternatively, X may be determined based on the bandwidth of the PDSCH carrying the first RAR (in other words, the number of RBs) and the maximum bandwidth of the baseband processing of the first type terminal device (in other words, the number of RBs). For example, X may be determined based on the ratio of ...

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[0156] In the present application, if random access fails, the terminal device retransmits or is ready to retransmit the PRACH within the extended first period, so that the terminal device has more time to process the PDSCH. Therefore, the probability of successfully receiving (or decoding) the PDSCH can be increased, and the probability of successful random access can be increased.

[0157] It should be noted that the fact that the terminal device retransmits or is ready to retransmit the PRACH in the first period does not mean that the terminal device needs to transmit the PRACH in that period. The terminal device may transmit the PRACH in the period, or may not transmit the PRACH in the period. This may depend specifically on the implementation of the terminal device or the instruction of the network device. This application describes one implementation in which the terminal device transmits the PRACH in the first period.

[0158] The above step S502 specifies that if the first RAR is not received within the first RAR time window, the terminal device re-executes random access in the first period. The following describes an example scenario in which random access is re-executed in the first period.

[0159] Example 1: In this example, the scenario in which no RAR is received may not be distinguished, and in the scenario in which no RAR is received, random access is restarted in the first period.

[0160] Specifically, in any one of the following scenarios in which the first RAR is not received, the terminal device re-performs random access in the first period:

[0161] Scenario 1: The first DCI from the network device is not received within the first RAR time window. In other words, the terminal device does not detect DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI within the first RAR time window.

[0162] Scenario 2: A first DCI from a network device is received within a first RAR time window, and the first N bits of a system frame number (SFN) carried in the first DCI in ascending order are different from the first N bits of the SFN corresponding to the first PRACH in ascending order, where N is an integer greater than 0. In other words, the terminal device detects a DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI within the first RAR time window, and the least significant bits (LSBs) of the SFN field in the DCI are different from the LSBs of the SFN of the first PRACH sent by the terminal device.

[0163] Scenario 3: A first DCI from a network device is received within a first RAR time window, and a transport block of a PDSCH scheduled using the first DCI is not correctly received. In other words, the terminal device does not correctly receive a transport block (TB) on the corresponding PDSCH within the first RAR time window. In other words, the terminal device receives DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI within the first RAR time window, but does not correctly receive the PDSCH scheduled using the DCI.

[0164] Scenario 4: The first DCI is received within the first RAR time window, the transport block of the PDSCH scheduled using the first DCI is received correctly, and the PDSCH scheduled using the first DCI does not carry the first RAR. In other words, the terminal device does not acknowledge or identify the RAP ID associated with the transmitted first PRACH within the first RAR time window. In other words, the terminal device receives DCI format 1_0 with a CRC scrambled by the corresponding RA-RNTI within the first RAR time window and correctly receives the PDSCH scheduled using the DCI, but the PDSCH does not carry the RAR for the terminal device.

[0165] In the above example 1, the scenario in which the RAR is not received is not distinguished, and random access is restarted in the first period in any scenario in which the RAR is not received, thereby reducing the implementation complexity of the terminal device.

[0166] Example 2: In this example, a scenario in which the RAR is not received is distinguished. In a scenario in which the PDSCH needs to be analyzed and the bandwidth of the PDSCH is greater than the maximum bandwidth of the baseband processing of the first type of terminal device, if the RAR is not received, the random access is restarted in the first period.

[0167] Specifically, in any one of the following scenarios in which the first RAR is not received, the terminal device re-performs random access in the first period:

[0168] Scenario 5: A first DCI from a network device is received within a first RAR time window, a transport block of a PDSCH scheduled using the first DCI is not received correctly, and the bandwidth of the PDSCH scheduled using the first DCI is larger than the maximum bandwidth of the baseband processing of the first type terminal device.

[0169] Scenario 6: The first DCI is received within the first RAR time window, the transport block of the PDSCH scheduled using the first DCI is received correctly, the PDSCH scheduled using the first DCI does not carry the first RAR, and the bandwidth of the PDSCH scheduled using the first DCI is greater than the maximum bandwidth of the baseband processing of the first type terminal device.

[0170] Optionally, in Example 2, in a scenario where the PDSCH does not need to be analyzed, or the PDSCH needs to be analyzed but the bandwidth of the PDSCH is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device, if the RAR is not received, the terminal device may resume random access in the second period.

[0171] Specifically, in any one of the following scenarios in which the first RAR is not received, the terminal device may re-perform random access in the second period:

[0172] Scenario 7: The first DCI is not received within the first RAR time window.

[0173] Scenario 8: A first DCI is received within a first RAR time window, and the first M bits of the system frame number carried in the first DCI in ascending order are different from the first M bits of the system frame number corresponding to the first physical random access channel in ascending order, where M is an integer greater than 0.

[0174] Scenario 9: A first DCI is received within a first RAR time window, a transport block of a PDSCH scheduled using the first DCI is not received correctly, and the bandwidth of the PDSCH scheduled using the first DCI is less than or equal to the maximum bandwidth of baseband processing of the first type terminal device.

[0175] Scenario 10: A first DCI is received within a first RAR time window, a transport block of a PDSCH scheduled using the first DCI is correctly received, the PDSCH scheduled using the first DCI does not carry an RAR corresponding to a first physical random access channel, and the bandwidth of the PDSCH scheduled using the first DCI is less than or equal to the maximum bandwidth of baseband processing of a first type terminal device.

[0176] In one possible implementation, the first type of terminal device may further transmit a second PRACH to the network device and may transmit the second PRACH to the network device in a second period if one of the following scenarios is met:

[0177] The second DCI is not received within the second RAR time window, and the second DCI is used to schedule the PDSCH carrying the RAR.

[0178] Alternatively, the second DCI is received within the second RAR time window, and the first M bits of the SFN carried in the second DCI in ascending order are different from the first M bits of the SFN corresponding to the second PRACH in ascending order, where M is an integer greater than 0.

[0179] Alternatively, the second DCI is received within the second RAR time window, a transport block of the PDSCH scheduled using the second DCI is not received correctly, and the bandwidth of the PDSCH scheduled using the second DCI is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device.

[0180] Alternatively, the second DCI is received within the second RAR time window, a transport block of the PDSCH scheduled using the second DCI is correctly received, the PDSCH scheduled using the second DCI does not carry an RAR corresponding to the second PRACH, and the bandwidth of the PDSCH scheduled using the second DCI is less than or equal to the maximum bandwidth of baseband processing of the first type terminal device.

[0181] In the above example 2, a distinction is made between scenarios where no RAR is received: in scenarios where the PDSCH does not need to be parsed (or decoded) or the PDSCH bandwidth is small, the random access is re-performed in a second period of shorter duration so that the random access latency can be reduced, improving communication performance.

[0182] Above, an implementation form in which the terminal device re-performs random access has been described. From the above related description of the four-step RACH, it can be seen that after receiving the RAR, the terminal device can send Msg3 to the network device. The following describes possible ways to send Msg3.

[0183] Optionally, if the terminal device receives a first RAR from the network device within the first RAR time window, the terminal device may transmit Msg3 via a physical uplink shared channel (PUSCH) scheduled using an RAR uplink grant (RAR UL grant) carried in the first RAR.

[0184] In this way, if the bandwidth of the PDSCH carrying the first RAR is greater than the maximum bandwidth of the baseband processing of the first type of terminal device, the terminal device may transmit Msg3 to the network device after the third period.

[0185] If the bandwidth of the PDSCH carrying the first RAR is less than or equal to the maximum bandwidth of the baseband processing of the first type of terminal device, the terminal device may transmit Msg3 to the network device in a random access procedure after the fourth period.

[0186] The third period of time has a duration greater than the duration of the fourth period of time.

[0187] In the example description, the third period may be understood as the minimum time between the last symbol of the PDSCH carrying the first RAR and the first symbol of the PUSCH scheduled by the RAR UL grant carried in the first RAR, and the fourth period may be understood as the minimum time between the last symbol of the PDSCH carrying the first RAR and the first symbol of the PUSCH scheduled by the RAR UL grant carried in the first RAR.

[0188] In one example, the duration of the third period is (N T,1 +N T,2 +b+Y), and the duration of the fourth period is (N T,1 +N T,2 +b). N T,1 is the processing duration of the PDSCH of the first type terminal device or the second type terminal device, and N T,2 Y is the preparation duration of the physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value. For example, b may be 0.5.

[0189] It should be noted that in a specific implementation, the expression format of the duration of the third period is not limited to four values, or may be three values. For example, Y and b can be combined, that is, the duration of the third period is (N T,1 +N T,2 +B), and B = b + Y. Alternatively, Y and N T,1 and the duration of the third period can be combined as (N1 + N T,2 +b), and N2 = N T,1 +Y. Or, Y and N T,2 and the duration of the third period can be combined. T,1 +N3+b), where N3=N T,2 +Y. The duration of the third period can alternatively be expressed as (N T,1 +N T,2 +b+Y) are possible and are not to be enumerated one by one here.

[0190] N T,1 For the value of N, see above. T,2 For values ​​of N, see Chapter 8.3 of 3GPP 38.213 Release 17.4.0. T,2 is the duration of N2 OFDM symbols corresponding to the PUSCH preparation time of UE processing capability 1. For the specific value of N2, please refer to the description of N2 in Chapter 6.4 of 3GPP 38.214 Release 17.4.0. Details will not be repeated here.

[0191] Y is predefined, for example, Y is equal to 1 ms; Y is equal to N T,1, where T is 1 or more, for example, Y is equal to 1; or Y is determined based on the bandwidth of the PDSCH carrying the first RAR and the maximum bandwidth of the baseband processing of the first type terminal device. For details regarding the above three value rules, please refer to the above related description of the value of X. Details will not be repeated here. It should be noted that the value of Y may be the same as or different from the value of X. This is not particularly limited in this specification.

[0192] As mentioned above, if the time interval between the PDSCH carrying the first RAR and the scheduled PUSCH is equal to or greater than the third or fourth period, the terminal device may transmit Msg3.

[0193] Optionally, if the time interval between the PDSCH carrying the first RAR and the scheduled PUSCH is less than the third period or the fourth period, the terminal device may determine whether to transmit the PUSCH based on the implementation of the terminal device.

[0194] For example, if the terminal device does not complete processing of the entire PDSCH, the terminal device may not be able to successfully decode the PDSCH and may not be able to acknowledge the terminal device's RAR message (i.e., the first RAR). In this case, the terminal device may consider the random access to have failed and may retransmit the first PRACH.

[0195] Alternatively, even if the terminal device does not complete processing of the entire PDSCH, the terminal device may still acknowledge its RAR message (i.e., the first RAR) based on some data of the PDSCH. In this case, the terminal device may send Msg3.

[0196] Optionally, the terminal device may report its UE type or capability in Msg3, for example, may report that the terminal device is a first type terminal device, or may report the maximum baseband of the bandwidth processing of the terminal device. Specifically, the terminal device may perform the report using a specific logical channel number, or may perform the report via a signaling unit. In the present application, the reporting method is not limited.

[0197] The above solution in which the terminal device sends Msg3 can be implemented independently without relying on the method of FIG.

[0198] From the above related description of the four-step RACH, it can be seen that after sending Msg3 to the network device, the terminal device may receive Msg4 carrying contention resolution information. Optionally, after receiving Msg4, the terminal device may send Msg4 PDSCH acknowledgement information carrying contention resolution information, i.e., hybrid automatic retransmission request-acknowledgment (HARQ-ACK) information, to the network device. The following describes a possible way of sending the acknowledgement information of the contention resolution information.

[0199] Optionally, after receiving the contention resolution information, the terminal device may send acknowledgment information of the contention resolution information to the network device. Specifically, the terminal device may send the acknowledgment information of the contention resolution information via a physical uplink control channel (PUCCH).

[0200] If the bandwidth of the PDSCH carrying the contention resolution information is greater than the maximum bandwidth of the baseband processing of the first type terminal device, the terminal device sends acknowledgment information for the contention resolution information to the network device after a fifth period.

[0201] If the bandwidth of the PDSCH carrying the contention resolution information is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device, the terminal device transmits acknowledgment information for the contention resolution information to the network device after a sixth period.

[0202] The fifth period has a duration greater than the duration of the sixth period.

[0203] In one example description, the fifth period can be understood as the minimum time between the last symbol of the PDSCH carrying contention resolution information and the first symbol of the PUCCH carrying acknowledgment information for the contention resolution information. The sixth period can be understood as the minimum time between the last symbol of the PDSCH carrying contention resolution information and the first symbol of the PUCCH carrying acknowledgment information for the contention resolution information.

[0204] In one example, the duration of the fifth period is (N T,1 +c+Z), and the duration of the sixth period is (N T,1 + c), where Z is greater than 0 and c is a preset value. For example, c may be 0.5. N T,1 For the value of , see above.

[0205] It should be noted that in a specific implementation, the expression format of the duration of the fifth period is not limited to three values, or may be two values. For example, Z and C can be combined, that is, the duration of the fifth period is (N T,1 +C), and C=c+Z. Or, Z and N T,1 and can be combined, i.e., the duration of the fifth period is (N4+c), where N4=N T,1 +Z. The fifth period duration expression is alternatively (N T,1 +c+Z) are possible and are obviously not enumerated one by one here.

[0206] Z is predefined, for example, Z is equal to 1ms; Z is equal to N T,1, where H is 1 or more, for example, H is equal to 1; or Z is determined based on the bandwidth of the PDSCH carrying the first RAR and the maximum bandwidth of the baseband processing of the first type terminal device. For details regarding the above three value rules, please refer to the above related explanation of the value of X. Details will not be repeated here. It should be noted that the value of Z may be the same as or different from the value of X. This is not particularly limited herein. The value of Z may be the same as or different from the value of Y. This is not particularly limited herein.

[0207] As described above, if the time interval between the PDSCH carrying the contention resolution information and the PUCCH carrying the acknowledgement information for the contention resolution information is equal to or greater than the fifth or sixth period, the terminal device may transmit the acknowledgement information for the contention resolution information.

[0208] Optionally, if the time interval between the PDSCH carrying the contention resolution information and the PUCCH carrying the acknowledgment information of the contention resolution information is less than the fifth period or the sixth period, the terminal device may determine whether to send the acknowledgment information of the contention resolution information based on the implementation of the terminal device.

[0209] For example, if the terminal device does not complete the processing of the entire PDSCH, the terminal device may not be able to successfully decode the PDSCH and cannot acknowledge the contention resolution information of the terminal device, in which case the terminal device may consider the random access to have failed and may retransmit the first PRACH.

[0210] Alternatively, even if the terminal device does not complete processing of the entire PDSCH, the terminal device may still acknowledge the contention resolution information of the terminal device based on some data of the PDSCH. In this case, the terminal device may transmit acknowledgement information of the contention resolution information.

[0211] The above solution in which the terminal device transmits HARQ-ACK information in Msg4 can be implemented independently without relying on the method of FIG.

[0212] Above, the technical solution in the embodiment of the present application is described by using a four-step RACH as an example. The above method can also be applied to a two-step RACH. In the following, the technical solution in the embodiment of the present application is described by using a two-step RACH as an example.

[0213] In the two-step RACH, the terminal device can send MsgA to the network device, where MsgA includes the first PRACH and PUSCH payload. For details, see step S21 in the above terminology introduction (5).

[0214] After sending MsgA, the terminal device may monitor the first RAR from the network device. For a specific method of monitoring the first RAR, please refer to the relevant description of S501.

[0215] If the terminal device does not receive the first RAR within the first RAR time window, the terminal device may retransmit MsgA to the network device. That is, random access is resumed. For details, please refer to the relevant description of S502. Details will not be repeated here.

[0216] Optionally, if the terminal device receives the first RAR within the first RAR time window, and the first RAR is a fallback RAR, the terminal device may retransmit the PUSCH payload based on the first RAR. For a specific process, refer to the above-mentioned process of transmitting Msg3. Details will not be repeated here.

[0217] If the terminal device receives the first RAR within the first RAR time window and the first RAR is a success RAR (successRAR), the terminal device may send acknowledgement information for MsgB, i.e., acknowledgement information for the contention resolution information. For a specific process, refer to the above-mentioned process for sending acknowledgement information for the contention resolution information. Details will not be repeated here.

[0218] In this embodiment of the present application, when the bandwidth of a PDSCH (for example, a PDSCH carrying an RAR or a PDSCH carrying contention resolution information) is larger than the bandwidth of a terminal device, the time for retrying random access is extended, so that the time for decoding the PDSCH can be extended and the probability of successfully acquiring the information carried by the PDSCH can be increased, which is helpful in increasing the success probability of the random access procedure and improving random access performance.

[0219] The above describes the random access procedure for a terminal device. Optionally, a similar solution may also be applied to the transmission of SIB1, other system information (OSI), paging, etc. on the broadcast channel.

[0220] For example, when the bandwidth of the PDSCH carrying the broadcast channel is larger than the maximum bandwidth of the baseband processing of the first type terminal device, the time required for the terminal device to process the PDSCH carrying the broadcast channel is equal to or longer than the time required for the second type terminal device to process the PDSCH carrying the broadcast channel. In other words, during the time required for the second type terminal device to process the PDSCH carrying the broadcast channel, a loss in reception performance of the broadcast channel by the first type terminal device occurs, and the corresponding demodulation signal-to-interference plus noise ratio is higher than the demodulation SINR of the second type terminal device for the broadcast channel. However, by extending the processing time of the PDSCH carrying the broadcast channel, the loss in reception performance of the broadcast channel by the first type terminal device can be reduced, and the demodulation SINR of the broadcast channel can be correspondingly reduced.

[0221] For example, the time required for processing a PDSCH carrying a first broadcast channel by a first type of terminal device is equal to the time required for processing a PDSCH carrying the first broadcast channel by a second type of terminal device plus W. The first broadcast channel may be any one of the aforementioned broadcast channels. It should be understood that for different broadcast channels, the value of the extension time W may be the same or different. This is not particularly limited herein.

[0222] W is predefined, for example, W is equal to 1 ms; W is Q times the time for the second type terminal device to process the PDSCH carrying the first broadcast channel, where Q is 1 or more, for example, Q is equal to 1; or W is determined based on the bandwidth of the PDSCH carrying the first RAR and the maximum bandwidth of baseband processing of the first type terminal device. For details about the above three value rules, please refer to the above related description of the value of X. Details will not be repeated here. It should be noted that the value of W may be the same as or different from the values ​​of X, Y, and Z. This is not particularly limited in this specification.

[0223] Optionally, if the bandwidth of the PDSCH carrying the broadcast channel is less than or equal to the maximum bandwidth of baseband processing of the first type terminal device, the time for processing the PDSCH carrying the broadcast channel by the terminal device may be equal to the time for processing the PDSCH carrying the broadcast channel by the second type terminal device.

[0224] As mentioned above, the corresponding processing time is determined based on the bandwidth of the PDSCH carrying the broadcast channel, so that the probability of successfully acquiring the broadcast channel can be increased, which helps to improve communication performance.

[0225] Based on the same concept as the method embodiment, an embodiment of the present application provides a communication device. The structure of the communication device can be shown in Figure 6, where the communication device includes: a communication module 601 and a processing module 602.

[0226] In one implementation, a communication device may be specifically configured to implement the method performed by the terminal device in the embodiment of FIG. 5. The device may be a terminal device, or a chip or chipset within the terminal device, or part of a chip configured to perform the functions of the associated method. The communication module 601 is configured to communicate with the network device. The processing module 602 is configured to transmit a first physical random access channel to the network device via the communication module 601, and if a first random access response corresponding to the first physical random access channel is not received within a first random access response time window, transmit the first physical random access channel to the network device within a first period via the communication module 601. The duration of the first period is longer than the duration of the second period, the first period corresponding to a first type of terminal device, and the second period used by a second type of terminal device to retry random access when a second random access response is not received within the random access response time window, the second random access response being a random access response corresponding to the physical random access channel transmitted by the second type of terminal device.

[0227] For example, the first random access response corresponding to the first physical random access channel not being received within the first random access response time window includes: first downlink control information from the network device is not received within a first random access response time window, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; first downlink control information from the network device is received within a first random access response time window, and the first N bits of a system frame number carried in ascending order in the first downlink control information are different from the first N bits of a system frame number corresponding to a first physical random access channel in ascending order, where N is an integer greater than 0, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; First downlink control information from the network device is received within a first random access response time window, and a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; or First downlink control information is received within a first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, and the first downlink control information is used to schedule a physical downlink shared channel that carries the random access response.

[0228] For example, the random access response corresponding to the first physical random access channel not being received within the first random access response time window includes: First downlink control information from the network device is received within a first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, the bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than the maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule a physical downlink shared channel carrying the random access response; or The first downlink control information is received within a first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, the bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than a maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule the physical downlink shared channel carrying the random access response.

[0229] Optionally, the processing module 602 is further configured to transmit a second physical random access channel to the network device via the communication module 601, and to transmit the second physical random access channel to the network device in a second time period via the communication module 601 if one of the following scenarios is met: the second downlink control information is not received within a second random access response time window, and the second downlink control information is used to schedule a physical downlink shared channel carrying the random access response; second downlink control information is received within a second random access response time window, and the first M bits of a system frame number carried in ascending order in the second downlink control information are different from the first M bits of a system frame number corresponding to a second physical random access channel in ascending order, where M is an integer greater than 0, and the second downlink control information is used to schedule a physical downlink shared channel carrying the random access response; The second downlink control information is received within a second random access response time window, a transport block of the physical downlink shared channel scheduled using the second downlink control information is not correctly received, and the bandwidth of the physical downlink shared channel scheduled using the second downlink control information is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device; or The second downlink control information is received within a second random access response time window, a transport block of a physical downlink shared channel scheduled using the second downlink control information is correctly received, the physical downlink shared channel scheduled using the second downlink control information does not carry a random access response corresponding to the second physical random access channel, and the bandwidth of the physical downlink shared channel scheduled using the second downlink control information is less than or equal to a maximum bandwidth of baseband processing of the first type terminal device.

[0230] For example, the duration of the first period is (N T,1 +a+X), and the duration of the second period is (N T,1 +a). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

[0231] For example, X is predefined, e.g., X is equal to 1 ms; X is equal to N T,1X is K times, where K is 1 or greater, for example, K is equal to 1; or X is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0232] Optionally, the processing module 602 is further configured to: send Msg3 to the network device in the random access procedure after a third period via the communication module 601 if a first random access response from the network device is received within a first random access response time window and a bandwidth of the physical downlink shared channel carrying the first random access response is greater than a maximum bandwidth of baseband processing of the first type of terminal device; or send Msg3 to the network device in the random access procedure after a fourth period via the communication module 601 if the first random access response is received within the first random access response time window and a bandwidth of the physical downlink shared channel carrying the first random access response is equal to or less than a maximum bandwidth of baseband processing of the first type of terminal device, wherein a duration of the third period is longer than a duration of the fourth period.

[0233] For example, the duration of the third period is (N T,1 +N T,2 +b+Y), and the duration of the fourth period is (N T,1 +N T,2 +b). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T,2 Y is the preparation duration of the physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

[0234] For example, Y is predefined, e.g., Y is equal to 1 ms; Y is equal to N T,1, where T is greater than or equal to 1, for example, T is equal to 1; or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0235] Optionally, the processing module 602 is further configured to receive contention resolution information from the network device via the communication module 601, and send, via the communication module 601, acknowledgement information for the contention resolution information to the network device after a fifth period if the bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than a maximum bandwidth of baseband processing of the first type terminal device, or send, via the communication module 601, acknowledgement information for the contention resolution information to the network device after a sixth period if the bandwidth of the physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of baseband processing of the first type terminal device, wherein a duration of the fifth period is longer than a duration of the sixth period.

[0236] For example, the duration of the fifth period is (N T,1 +c+Z), and the duration of the sixth period is (N T,1 +c). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

[0237] For example, Z is predefined, e.g., Z is equal to 1 ms; Z is equal to N T,1 , where H is greater than or equal to 1, for example, H is equal to 1; or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0238] For example, the start of the first period is the last symbol of the first random access response time window, or the start of the first period is the last symbol of the physical downlink shared channel in the first random access response time window.

[0239] For example, the maximum bandwidth of the baseband processing of the first type terminal device is smaller than the maximum radio frequency bandwidth of the first type terminal device, and the maximum bandwidth of the baseband processing of the second type terminal device is equal to the maximum radio frequency bandwidth of the second type terminal device.

[0240] In one implementation, a communication device may be specifically configured to implement the method performed by the network device in the embodiment of FIG. 5. The device may be the network device, a chip or chipset within the network device, or part of a chip configured to perform the functions of the associated method. The communication module 601 is configured to communicate with a terminal device. The processing module 602 is configured to monitor a first physical random access channel from the terminal device via the communication module 601 and monitor the first physical random access channel from the terminal device again during a first period via the communication module 601. The duration of the first period is longer than the duration of the second period, the first period corresponds to a first type of terminal device, and the second period is used by a second type of terminal device to retry random access when a second random access response is not received within the random access response time window, the second random access response being a random access response corresponding to the physical random access channel transmitted by the second type of terminal device.

[0241] Optionally, the processing module 602 is further configured to: monitor a second physical random access channel from the terminal device via the communication module 601; transmit the second physical downlink shared channel to the terminal device within a second random access response time window via the communication module 601, wherein a bandwidth of the second physical downlink shared channel is less than or equal to a maximum bandwidth of baseband processing of the first type terminal device, and the second physical downlink shared channel is used to carry the random access response; and again monitor the second physical random access channel from the terminal device in a second period.

[0242] For example, the duration of the first period is (N T,1 +a+X), and the duration of the second period is (N T,1 +a). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

[0243] For example, X is predefined, e.g., X is equal to 1 ms; X is equal to N T,1 X is K times, where K is 1 or greater, for example, K is equal to 1; or X is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0244] Optionally, the processing module 602 is further configured to: send a random access response of the first physical random access channel to the terminal device via the communication module 601; and receive a third message Msg3 from the terminal device in the random access procedure after a third period via the communication module 601 if the bandwidth of the physical downlink shared channel carrying the random access response is greater than a maximum bandwidth of baseband processing of the first type terminal device, or receive the third message Msg3 from the terminal device in the random access procedure after a fourth period if the bandwidth of the physical downlink shared channel carrying the random access response is equal to or less than the maximum bandwidth of baseband processing of the first type terminal device, wherein the duration of the third period is longer than the duration of the fourth period.

[0245] For example, the duration of the third period is (N T,1 +N T,2 +b+Y), and the duration of the fourth period is (N T,1 +N T,2 +b). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T,2 Y is the preparation duration of the physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

[0246] For example, Y is predefined, e.g., Y is equal to 1 ms; Y is equal to N T,1 , where T is greater than or equal to 1, for example, T is equal to 1; or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0247] Optionally, the processing module 602 is further configured to: send contention resolution information to the terminal device via the communication module 601; and receive, from the terminal device via the communication module 601, acknowledgment information for the contention resolution information after a fifth period if the bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than a maximum bandwidth of baseband processing of the first type terminal device, or receive, from the terminal device via the communication module 601, acknowledgment information for the contention resolution information after a sixth period if the bandwidth of the physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of baseband processing of the first type terminal device. The duration of the fifth period is longer than the duration of the sixth period, the fifth period corresponds to the first type terminal device, and the sixth period corresponds to the first type terminal device or the second type terminal device.

[0248] For example, the duration of the fifth period is (N T,1 +c+Z), and the duration of the sixth period is (N T,1 +c). N T,1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

[0249] For example, Z is predefined and Z is equal to 1ms; Z is N T,1 , where H is greater than or equal to 1, for example, H is equal to 1; or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device.

[0250] For example, the start of the first period is the last symbol of the first random access response time window, or the start of the first period is the last symbol of the physical downlink shared channel in the first random access response time window.

[0251] For example, the maximum bandwidth of the baseband processing of the first type terminal device is smaller than the maximum radio frequency bandwidth of the first type terminal device, and the maximum bandwidth of the baseband processing of the second type terminal device is equal to the maximum radio frequency bandwidth of the second type terminal device.

[0252] The division into modules in the embodiments of the present application is an example and is merely a logical division of functions, and other divisions may be used in actual implementation. In addition, the functional modules in the embodiments of the present application may be integrated into one processor, or each module may exist physically alone, or two or more modules may be integrated into one module. The integrated module may be implemented in the form of hardware or in the form of a software functional module. It should be understood that the functions or implementations of the modules in this embodiment of the present application may further refer to the relevant descriptions in the method embodiments.

[0253] In one possible embodiment, a communication device may be shown in FIG. 7. The device may be a communication device or a chip within a communication device. The communication device may be a terminal device or a network device. The device includes a processor 701 and a communication interface 702, and may further include a memory 703. The processing module 602 may be the processor 701. The communication module 601 may be the communication interface 702.

[0254] The processor 701 may be a CPU, a digital processing unit, etc. The communication interface 702 may be a transceiver, an interface circuit such as a transceiver circuit, a transceiver chip, etc. The apparatus further includes a memory 703 configured to store a program executed by the processor 701. The memory 703 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or a volatile memory, such as a random-access memory (RAM). The memory 703 may be any medium that can be used to hold or store expected program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.

[0255] The processor 701 is configured to execute program code stored in the memory 703, and is particularly configured to perform the operations of the processing module 602. Details will not be described again in this application. The communication interface 702 is particularly configured to perform the operations of the communication module 601. Details will not be described again in this application.

[0256] The specific connection medium between the communication interface 702, the processor 701, and the memory 703 is not limited in this embodiment of the present application. In this embodiment of the present application, the memory 703, the processor 701, and the communication interface 702 are connected via a bus 704 in FIG. 7. The bus is represented using a bold line in FIG. 7, and the connection manner between the other components is only schematically described and is not limited thereto. The bus may be classified into an address bus, a data bus, a control bus, etc. For ease of representation, only one bold line is used in the representation of FIG. 7, but this does not mean that there is only one bus or only one type of bus.

[0257] An embodiment of the present application further provides a computer-readable storage medium configured to store computer software instructions that need to be executed by a processor. The computer software instructions include a program that needs to be executed by the processor.

[0258] An embodiment of the present application further provides a communication system including a communication device configured to perform the functions of the terminal device in the embodiment of FIG. 5 and a communication device configured to perform the functions of the network device in the embodiment of FIG. 5.

[0259] Those skilled in the art will understand that the embodiments of the present application may be provided as a method, a system, or a computer program product. Thus, the present application may take the form of a hardware-only embodiment, a software-only embodiment, or an embodiment having a combination of software and hardware. In addition, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code.

[0260] This application has been described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to this application. It should be understood that each procedure and / or block of the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams, may be implemented using computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or another programmable data processing device to generate a machine, such that the instructions, executed by the processor of the computer or another programmable data processing device, generate an apparatus configured to perform the specified function(s) in one or more procedures of the flowcharts and / or one or more blocks of the block diagrams.

[0261] These computer program instructions may alternatively be stored in a computer-readable memory that can cause a computer or another programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable memory generate an artifact that includes an instruction apparatus that implements a specific function(s) in one or more processes in the flowcharts and / or one or more blocks in the block diagrams.

[0262] These computer program instructions may alternatively be loaded into a computer or other programmable data processing device, and then executed on the computer or other programmable device as a sequence of operations and steps to produce a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing a particular function in one or more procedures of the flowcharts and / or one or more blocks of the block diagrams. [Explanation of symbols]

[0263] 601 Communication Module 602 Processing Module 701 processor 702 Communication Interface 703 memory 704 Bus

Claims

1. 1. A communication method comprising: transmitting a first physical random access channel to a network device; transmitting a first random access response corresponding to a third physical random access channel to the network device during a first period of time if the first random access response corresponding to the third physical random access channel is not received within a first random access response time window; Including, The duration of the first period is longer than the duration of the second period, the first period corresponds to a first type of terminal device, the second period is used by a second type of terminal device to re-perform random access when a second random access response is not received within a random access response time window, and the second random access response is a random access response corresponding to a physical random access channel transmitted by the second type of terminal device; method.

2. the first random access response corresponding to the third physical random access channel is not received within the first random access response time window; first downlink control information from the network device is not received within the first random access response time window, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; first downlink control information from the network device is received within the first random access response time window, and first N bits of a system frame number carried in ascending order in the first downlink control information are different from first N bits of a system frame number corresponding to the third physical random access channel in ascending order, N is an integer greater than 0, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; First downlink control information from the network device is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; or First downlink control information is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response.

2. The method of claim 1, comprising:

3. the first random access response corresponding to the third physical random access channel is not received within the first random access response time window; First downlink control information from the network device is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, a bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than a maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; or First downlink control information is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, a bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than a maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response.

2. The method of claim 1, comprising:

4. transmitting a second physical random access channel to the network device; transmitting the second physical random access channel to the network device during the second time period if one of the following scenarios is met: and wherein the scenario further comprises: second downlink control information is not received within a second random access response time window, and the second downlink control information is used to schedule a physical downlink shared channel carrying a random access response; second downlink control information is received within a second random access response time window, and first M bits of a system frame number carried in ascending order in the second downlink control information are different from first M bits of a system frame number corresponding to the second physical random access channel in ascending order, where M is an integer greater than 0, and the second downlink control information is used to schedule a physical downlink shared channel carrying a random access response; Second downlink control information is received within a second random access response time window, a transport block of a physical downlink shared channel scheduled using the second downlink control information is not correctly received, and a bandwidth of the physical downlink shared channel scheduled using the second downlink control information is less than or equal to a maximum bandwidth of baseband processing of the first type terminal device; or second downlink control information is received within a second random access response time window, a transport block of a physical downlink shared channel scheduled using the second downlink control information is correctly received, the physical downlink shared channel scheduled using the second downlink control information does not carry a random access response corresponding to the second physical random access channel, and a bandwidth of the physical downlink shared channel scheduled using the second downlink control information is equal to or less than a maximum bandwidth of baseband processing of the first type terminal device.

4. The method of claim 3, comprising:

5. The duration of the first period is (N T，1 + a + X), and the duration of the second period is (N T，1 + a), and N T，1 5. The method according to claim 1, wherein X is a processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

6. X is predefined, X is N T，1 K times , where K is 1 or greater, or X is determined based on a bandwidth of a physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; The method of claim 5.

7. 7. The method of claim 6, wherein X is 1 millisecond.

8. sending a third message Msg3 to the network device in a random access procedure after a third period of time if the first random access response from the network device is received within the first random access response time window and the bandwidth of the physical downlink shared channel carrying the first random access response is greater than the maximum bandwidth of the baseband processing of the first type terminal device; or sending a third message Msg3 to the network device in a random access procedure after a fourth period if the first random access response is received within the first random access response time window and the bandwidth of the physical downlink shared channel carrying the first random access response is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device; further comprising the third period of time is longer in duration than the fourth period of time; 8. The method according to any one of claims 1 to 7.

9. The duration of the third period is (N T，1 +N T，2 +b+Y), and the duration of the fourth period is (N T，1 +N T，2 + b), and N T，1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T，2 9. The method of claim 8, wherein Y is a preparation duration of the physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

10. Y is predefined, Y is N T，1 T times, where T is equal to or greater than 1, or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; The method of claim 9.

11. The method of claim 10, wherein Y is 1 millisecond.

12. receiving conflict resolution information from the network device; If the bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than the maximum bandwidth of the baseband processing of the first type terminal device, sending an acknowledgement information of the contention resolution information to the network device after a fifth period; or if a bandwidth of a physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of the baseband processing of the first type terminal device, sending an acknowledgement information of the contention resolution information to the network device after a sixth period of time; further comprising the fifth period of time has a duration greater than the sixth period of time; 12. The method according to any one of claims 1 to 11.

13. The duration of the fifth period is (N T，1 +c+Z), and the duration of the sixth period is (N T，1 + c), and N T，1 13. The method of claim 12, wherein Z is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

14. Z is predefined, Z is N T，1 H times, where H is equal to or greater than 1, or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; The method of claim 13.

15. 15. The method of claim 14, wherein Z is 1 millisecond.

16. The start of the first period is the last symbol of the first random access response time window; or a start point of the first period is the last symbol of the physical downlink shared channel in the first random access response time window; 16. The method according to any one of claims 1 to 15.

17. 17. The method according to claim 1, wherein the maximum bandwidth of the baseband processing of the first type of terminal device is smaller than the maximum radio frequency bandwidth of the first type of terminal device, and the maximum bandwidth of the baseband processing of the second type of terminal device is equal to the maximum radio frequency bandwidth of the second type of terminal device.

18. 1. A communication method comprising: monitoring a first physical random access channel from a terminal device; again monitoring the first physical random access channel from the terminal device during a first period of time; Including, The duration of the first period is longer than the duration of the second period, the first period corresponds to a first type of terminal device, the second period is used by a second type of terminal device to re-perform random access when a second random access response is not received within a random access response time window, and the second random access response is a random access response corresponding to a physical random access channel transmitted by the second type of terminal device; method.

19. transmitting a first physical downlink shared channel to the terminal device within a first random access response time window, wherein the first physical downlink shared channel is used to carry a random access response, and a bandwidth of the first physical downlink shared channel is greater than a maximum bandwidth of baseband processing of the first type terminal device; 20. The method of claim 18, further comprising:

20. monitoring a second physical random access channel from the terminal device; transmitting a second physical downlink shared channel to the terminal device within a second random access response time window, wherein a bandwidth of the second physical downlink shared channel is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device, and the second physical downlink shared channel is used to carry a random access response; again monitoring the second physical random access channel from the terminal device during the second time period; 20. The method of claim 18 or 19, further comprising:

21. The duration of the first period is (N T，1 + a + X), and the duration of the second period is (N T，1 + a), and N T，1 21. The method according to claim 18, wherein X is a processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

22. X is predefined, X is N T，1 K times , where K is 1 or greater, or X is determined based on a bandwidth of a physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 22. The method of claim 21.

23. 23. The method of claim 22, wherein X is 1 millisecond.

24. sending a random access response on a third physical random access channel to the terminal device; receiving a third message Msg3 from the terminal device in a random access procedure after a third period of time if the bandwidth of a physical downlink shared channel carrying the random access response is greater than the maximum bandwidth of the baseband processing of the first type terminal device; or receiving a third message Msg3 from the terminal device in a random access procedure after a fourth period of time if a bandwidth of a physical downlink shared channel carrying the random access response is equal to or less than the maximum bandwidth of the baseband processing of the first type terminal device; further comprising the third period of time is longer in duration than the fourth period of time; 24. The method of any one of claims 18 to 23.

25. The duration of the third period is (N T，1 +N T，2 +b+Y), and the duration of the fourth period is (N T，1 +N T，2 + b), and N T，1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T，2 25. The method of claim 24, wherein Y is a preparation duration of a physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

26. Y is predefined, Y is N T，1 T times, where T is equal to or greater than 1, or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 26. The method of claim 25.

27. 27. The method of claim 26, wherein Y is 1 millisecond.

28. sending conflict resolution information to the terminal device; If the bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than the maximum bandwidth of the baseband processing of the first type terminal device, receiving acknowledgement information of the contention resolution information from the terminal device after a fifth period; or receiving, from the terminal device after a sixth period of time, acknowledgement information for the contention resolution information when a bandwidth of a physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of the baseband processing of the first type terminal device; further comprising The duration of the fifth period is longer than the duration of the sixth period, the fifth period corresponds to the first type of terminal device, and the sixth period corresponds to the first type of terminal device or the second type of terminal device; 28. The method of any one of claims 18 to 27.

29. The duration of the fifth period is (N T，1 +c+Z), and the duration of the sixth period is (N T，1 + c), and N T，1 29. The method of claim 28, wherein Z is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

30. Z is predefined, Z is N T，1 H times, where H is equal to or greater than 1, or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 30. The method of claim 29.

31. 31. The method of claim 30, wherein Z is 1 millisecond.

32. The start of the first period is the last symbol of the first random access response time window; or a start point of the first period is the last symbol of the physical downlink shared channel in the first random access response time window; 32. The method of any one of claims 18 to 31.

33. 33. The method according to claim 18, wherein the maximum bandwidth of the baseband processing of the first type of terminal device is smaller than the maximum radio frequency bandwidth of the first type of terminal device, and the maximum bandwidth of the baseband processing of the second type of terminal device is equal to the maximum radio frequency bandwidth of the second type of terminal device.

34. A communication device, a communication module configured to communicate with the network device; Transmitting a first physical random access channel to the network device via the communication module; If a first random access response corresponding to a third physical random access channel is not received within a first random access response time window, transmitting the first physical random access channel to the network device during a first period via the communication module. A processing module configured as follows: Equipped with The duration of the first period is longer than the duration of the second period, the first period corresponds to a first type of terminal device, the second period is used by a second type of terminal device to re-perform random access when a second random access response is not received within a random access response time window, and the second random access response is a random access response corresponding to a physical random access channel transmitted by the second type of terminal device; Communication equipment.

35. the first random access response corresponding to the third physical random access channel is not received within the first random access response time window; first downlink control information from the network device is not received within the first random access response time window, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; first downlink control information from the network device is received within the first random access response time window, and first N bits of a system frame number carried in ascending order in the first downlink control information are different from first N bits of a system frame number corresponding to the third physical random access channel in ascending order, N is an integer greater than 0, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; First downlink control information from the network device is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; or First downlink control information is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response.

35. The apparatus of claim 34, comprising:

36. the random access response corresponding to the third physical random access channel is not received within the first random access response time window; First downlink control information from the network device is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is not correctly received, a bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than a maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response; or First downlink control information is received within the first random access response time window, a transport block of a physical downlink shared channel scheduled using the first downlink control information is correctly received, the physical downlink shared channel scheduled using the first downlink control information does not carry the first random access response, a bandwidth of the physical downlink shared channel scheduled using the first downlink control information is greater than a maximum bandwidth of baseband processing of the first type terminal device, and the first downlink control information is used to schedule a physical downlink shared channel carrying a random access response.

35. The apparatus of claim 34, comprising:

37. the processing module: transmitting a second physical random access channel to the network device via the communication module; transmitting the second physical random access channel to the network device during the second time period via the communication module if one of the following scenarios is met: The scenario may further be configured as follows: second downlink control information is not received within a second random access response time window, and the second downlink control information is used to schedule a physical downlink shared channel carrying a random access response; second downlink control information is received within a second random access response time window, and first M bits of a system frame number carried in ascending order in the second downlink control information are different from first M bits of a system frame number corresponding to the second physical random access channel in ascending order, where M is an integer greater than 0, and the second downlink control information is used to schedule a physical downlink shared channel carrying a random access response; Second downlink control information is received within a second random access response time window, a transport block of a physical downlink shared channel scheduled using the second downlink control information is not correctly received, and a bandwidth of the physical downlink shared channel scheduled using the second downlink control information is less than or equal to a maximum bandwidth of baseband processing of the first type terminal device; or second downlink control information is received within a second random access response time window, a transport block of a physical downlink shared channel scheduled using the second downlink control information is correctly received, the physical downlink shared channel scheduled using the second downlink control information does not carry a random access response corresponding to the second physical random access channel, and a bandwidth of the physical downlink shared channel scheduled using the second downlink control information is equal to or less than a maximum bandwidth of baseband processing of the first type terminal device.

37. The apparatus of claim 36, comprising:

38. The duration of the first period is (N T，1 + a + X), and the duration of the second period is (N T，1 + a), and N T，1 38. The apparatus of claim 34, wherein x is a processing duration of a physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

39. X is predefined, X is N T，1 K times , where K is 1 or greater, or X is determined based on a bandwidth of a physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 39. The apparatus of claim 38.

40. 40. The apparatus of claim 39, wherein X is 1 millisecond.

41. the processing module: If the first random access response from the network device is received within the first random access response time window and the bandwidth of the physical downlink shared channel carrying the first random access response is greater than the maximum bandwidth of the baseband processing of the first type terminal device, sending a third message Msg3 to the network device in a random access procedure after a third period via the communication module; or If the first random access response is received within the first random access response time window and the bandwidth of the physical downlink shared channel carrying the first random access response is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device, send a third message Msg3 to the network device in a random access procedure after a fourth period via the communication module. further configured as follows: the third period of time is longer in duration than the fourth period of time; 41. Apparatus according to any one of claims 34 to 40.

42. The duration of the third period is (N T，1 +N T，2 +b+Y), and the duration of the fourth period is (N T，1 +N T，2 + b), and N T，1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T，2 42. The apparatus of claim 41, wherein Y is a preparation duration of a physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

43. Y is predefined, Y is N T，1 T times, where T is equal to or greater than 1, or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 43. The apparatus of claim 42.

44. 44. The apparatus of claim 43, wherein Y is 1 millisecond.

45. the processing module: receiving conflict resolution information from the network device via the communication module; If the bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than the maximum bandwidth of the baseband processing of the first type terminal device, sending an acknowledgement information of the contention resolution information to the network device after a fifth period via the communication module; or If a bandwidth of a physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of the baseband processing of the first type terminal device, transmitting an acknowledgement information of the contention resolution information to the network device after a sixth period. further configured as follows: the fifth period of time has a duration greater than the sixth period of time; 45. Apparatus according to any one of claims 34 to 44.

46. The duration of the fifth period is (N T，1 +c+Z), and the duration of the sixth period is (N T，1 + c), and N T，1 46. ​​The apparatus of claim 45, wherein Z is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

47. Z is predefined, Z is N T，1 H times, where H is equal to or greater than 1, or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 47. The apparatus of claim 46.

48. 48. The apparatus of claim 47, wherein Z is 1 millisecond.

49. The start of the first period is the last symbol of the first random access response time window; or a start point of the first period is the last symbol of the physical downlink shared channel in the first random access response time window; 49. Apparatus according to any one of claims 34 to 48.

50. 50. The apparatus according to claim 34, wherein the maximum bandwidth of the baseband processing of the first type of terminal device is smaller than the maximum radio frequency bandwidth of the first type of terminal device, and the maximum bandwidth of the baseband processing of the second type of terminal device is equal to the maximum radio frequency bandwidth of the second type of terminal device.

51. A communication device, a communication module configured to communicate with a terminal device; monitoring a first physical random access channel from the terminal device via the communication module; and again monitoring the first physical random access channel from the terminal device during a first period via the communication module. A processing module configured as follows: Equipped with The duration of the first period is longer than the duration of the second period, the first period corresponds to a first type of terminal device, the second period is used by a second type of terminal device to re-perform random access when a second random access response is not received within a random access response time window, and the second random access response is a random access response corresponding to a physical random access channel transmitted by the second type of terminal device; Communication equipment.

52. The communication module: Transmitting a first physical downlink shared channel to the terminal device within a first random access response time window, wherein the first physical downlink shared channel is used to carry a random access response, and the bandwidth of the first physical downlink shared channel is greater than a maximum bandwidth of baseband processing of the first type terminal device; 52. The apparatus of claim 51, further configured to:

53. The communication module: monitoring a second physical random access channel from the terminal device; transmitting a second physical downlink shared channel to the terminal device within a second random access response time window, wherein a bandwidth of the second physical downlink shared channel is less than or equal to the maximum bandwidth of the baseband processing of the first type terminal device, and the second physical downlink shared channel is used to carry a random access response; again monitoring the second physical random access channel from the terminal device during the second time period; 53. The apparatus of claim 51 or 52, further configured to:

54. The duration of the first period is (N T，1 + a + X), and the duration of the second period is (N T，1 + a), and N T，1 54. The apparatus of claim 51, wherein X is a processing duration of a physical downlink shared channel of the first type terminal device or the second type terminal device, X is greater than 0, and a is a preset value.

55. X is predefined, X is N T，1 K times , where K is 1 or greater, or X is determined based on a bandwidth of a physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 55. The apparatus of claim 54.

56. 56. The apparatus of claim 55, wherein X is 1 millisecond.

57. The communication module: Sending a random access response on a third physical random access channel to the terminal device; receiving a third message Msg3 from the terminal device in a random access procedure after a third period of time if the bandwidth of a physical downlink shared channel carrying the random access response is greater than the maximum bandwidth of the baseband processing of the first type terminal device; or receiving a third message Msg3 from the terminal device in a random access procedure after a fourth period of time if the bandwidth of a physical downlink shared channel carrying the random access response is equal to or less than the maximum bandwidth of the baseband processing of the first type terminal device; further configured as follows: the third period of time is longer in duration than the fourth period of time; 57. Apparatus according to any one of claims 54 to 56.

58. The duration of the third period is (N T，1 +N T，2 +b+Y), and the duration of the fourth period is (N T，1 +N T，2 + b), and N T，1 is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, and N T，2 58. The apparatus of claim 57, wherein Y is a preparation duration of a physical uplink shared channel of the first type terminal device or the second type terminal device, Y is greater than 0, and b is a preset value.

59. Y is predefined, Y is N T，1 T times, where T is equal to or greater than 1, or Y is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 59. The apparatus of claim 58.

60. 60. The apparatus of claim 59, wherein Y is 1 millisecond.

61. The communication module: sending conflict resolution information to the terminal device; If the bandwidth of the physical downlink shared channel carrying the contention resolution information is greater than the maximum bandwidth of the baseband processing of the first type terminal device, receiving acknowledgement information for the contention resolution information from the terminal device after a fifth period; or receiving, from the terminal device after a sixth period, acknowledgement information for the contention resolution information when a bandwidth of a physical downlink shared channel carrying the contention resolution information is equal to or less than the maximum bandwidth of the baseband processing of the first type terminal device; further configured as follows: The duration of the fifth period is longer than the duration of the sixth period, the fifth period corresponds to the first type of terminal device, and the sixth period corresponds to the first type of terminal device or the second type of terminal device; 61. Apparatus according to any one of claims 51 to 60.

62. The duration of the fifth period is (N T，1 +c+Z), and the duration of the sixth period is (N T，1 + c), and N T，1 62. The apparatus of claim 61, wherein Z is the processing duration of the physical downlink shared channel of the first type terminal device or the second type terminal device, Z is greater than 0, and c is a preset value.

63. Z is predefined, Z is N T，1 H times, where H is equal to or greater than 1, or Z is determined based on the bandwidth of the physical downlink shared channel carrying the first random access response and the maximum bandwidth of the baseband processing of the first type terminal device; 63. The apparatus of claim 62.

64. 64. The apparatus of claim 63, wherein Z is 1 millisecond.

65. The start of the first period is the last symbol of the first random access response time window; or a start point of the first period is the last symbol of the physical downlink shared channel in the first random access response time window; 65. Apparatus according to any one of claims 51 to 64.

66. 66. The apparatus of claim 51, wherein the maximum bandwidth of the baseband processing of the first type of terminal device is smaller than the maximum radio frequency bandwidth of the first type of terminal device, and the maximum bandwidth of the baseband processing of the second type of terminal device is equal to the maximum radio frequency bandwidth of the second type of terminal device.

67. 34. A computer-readable storage medium having stored thereon computer-readable instructions that, when executed on a communications device, cause the method of any one of claims 1 to 17 to be performed or the method of any one of claims 18 to 33 to be performed.

68. 1. A communication system comprising: A terminal device and a network device are provided, The terminal device transmits a first physical random access channel to the network device; If a first random access response corresponding to the first physical random access channel is not received within a first random access response time window, the terminal device transmits the first physical random access channel to the network device during a first period; The duration of the first period is longer than the duration of the second period, the first period corresponds to a first type of terminal device, the second period is used by a second type of terminal device to re-perform random access when a second random access response is not received within a random access response time window, and the second random access response is a random access response corresponding to a physical random access channel transmitted by the second type of terminal device; Communication system.

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