Communication method, terminal equipment and network equipment

Abstract

The invention provides a communication method, terminal equipment and network equipment. The method comprises: a terminal device receiving a first DCI sent by a network device, the first DCI being used for triggering a random access process or for indicating a first PRACH resource. In the embodiment of the invention, the network equipment sends the first DCI to the terminal equipment to trigger a random access process or indicate the first PRACH resource, so that additional random access opportunities or resources are provided for the terminal equipment, rapid recovery of uplink synchronization can be realized, the distribution of network resources can be optimized, and the flexibility of a system can be improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a communication method, a terminal device and a network device. Background Art

[0002] The random access process refers to the process from when the terminal device sends a random access preamble through the physical random access channel (PRACH) to try to access the network to the establishment of a basic signaling connection with the network. This process is a key step in establishing an initial communication connection between the terminal device and the network. Therefore, the random access process needs to be optimized. Summary of the invention

[0003] The present application provides a communication method, a terminal device and a network device. The following introduces various aspects involved in the present application.

[0004] In a first aspect, a communication method is provided, including: a terminal device receives a first DCI sent by a network device, wherein the first DCI is used to trigger a random access process or to indicate a first PRACH resource.

[0005] In a second aspect, a communication method is provided, comprising: sending a first DCI to a terminal device, wherein the first DCI is used to trigger a random access process or to indicate a first PRACH resource.

[0006] According to a third aspect, a terminal device is provided, comprising: a transceiver unit, configured to receive a first DCI sent by a network device, wherein the first DCI is used to trigger a random access process or to indicate a first PRACH resource.

[0007] In a fourth aspect, a network device is provided, comprising: a transceiver unit, configured to send a first DCI to a terminal device, wherein the first DCI is used to trigger a random access process or to indicate a first PRACH resource.

[0008] In a fifth aspect, a terminal device is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal device executes the method described in the first aspect.

[0009] In a sixth aspect, a network device is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the network device executes the method described in the second aspect.

[0010] In a seventh aspect, a device is provided, comprising a processor, configured to call a program from a memory so that the device executes a method as described in any one of the first aspect or the second aspect.

[0011] In an eighth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect or the second aspect.

[0012] In a ninth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0013] In a tenth aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0014] In an eleventh aspect, a computer program is provided, wherein the computer program enables a computer to execute the method as described in the first aspect or the second aspect.

[0015] In an embodiment of the present application, the network device sends a first DCI to the terminal device to trigger a random access process or indicate a first PRACH resource, thereby providing the terminal device with additional random access opportunities or resources, which is conducive to achieving rapid recovery of uplink synchronization, and at the same time can optimize the allocation of network resources and improve the flexibility of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2 is a diagram showing an example of a system architecture of a wireless communication system applicable to an embodiment of the present application.

[0017] Figure 2 A flowchart of a wireless communication method according to an embodiment of the present application is shown.

[0018] Figure 3 A schematic diagram of the structure of a terminal device according to an embodiment of the present application.

[0019] Figure 4 A schematic diagram of the structure of a network device according to an embodiment of the present application.

[0020] Figure 5 A schematic diagram of a device for communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0022] Wireless communication system

[0023] Figure 11 is an example diagram of the system architecture of a wireless communication system 100 to which an embodiment of the present application can be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide network coverage for a specific geographical area, and may communicate with the terminal device 120 located in the coverage area. The terminal device 120 may access a network, such as a wireless network, through the network device 110. Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0024] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in the present application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0025] In the embodiments of the present application, the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may be a device that provides voice and / or data connectivity to a user, and may be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device may also be a mobile phone, a tablet computer, a laptop, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the terminal device may be used to act as a base station. For example, the terminal device may act as a dispatching entity that provides sidelink signals between terminal devices in vehicle to everything (V2X) or device to device (D2D). For example, a cellular phone and a car communicate with each other using a sidelink signal. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

[0026] In an embodiment of the present application, a network device may be a device for communicating with a terminal device. The network device may be an access network device or a wireless access network device. For example, the network device may be a base station. The base station may broadly cover the following various names, or may be replaced with the following names, for example: Node B (NodeB), evolved NodeB (evolved NodeB, eNB), next generation NodeB (next generation NodeB, gNB), relay station, transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), master station (MeNB), auxiliary station (SeNB), multi-standard wireless (MSR) node, home base station, network controller, access node, wireless node, access point (access point, AP), transmission node, transceiver node, baseband unit (base band unit, BBU), remote radio unit (remote radio unit, RRU), active antenna unit (active antenna unit, AAU), radio head (remote radiohead, RRH), central unit (central unit, CU), distributed unit (distributed unit, DU), positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station may also refer to a communication module, a modem or a chip used to be arranged in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device to device D2D, vehicle-to-everything (V2X), a device that performs the base station function in machine-to-machine (M2M) communications, a network-side device in a 6G network, and a device that performs the base station function in future communication systems. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network equipment. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network equipment.

[0027] In addition, the base station can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device for communicating with another base station.

[0028] The network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of the present application do not limit the scenarios in which the network equipment and terminal equipment are located.

[0029] It should be understood that all or part of the functions of the communication device in the present application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform such as a cloud platform.

[0030] In a wireless communication system, after the user turns on the device, it is necessary to establish downlink and uplink synchronization with the system. In LTE systems and NR systems, for example, when the user initially accesses, initiates a connection request to the network device when recovering from a dormant state, and switches to a new cell, it is necessary to first perform downlink synchronization, and then perform uplink synchronization and access. By reestablishing the connection through PRACH, the terminal device can request the network device to allocate resources for it for data transmission or other communications. When the traffic changes, the terminal device can dynamically request the required resources through PRACH to enhance the flexibility of the network. Using random preamble codes, PRACH can effectively reduce the probability of conflicts and handle conflicts through a retransmission mechanism. There are many events that trigger the random access process, such as initial access from the unlimited resource management (radio resource control, RRC) idle (RRC_IDLE) state, RRC connection reestablishment process, scheduling request (scheduling request, SR) failure, beam failure recovery, etc. Therefore, the random access process may be performed when the terminal device is in the RRC idle state, RRC activated (RRC_INACTIVE) state, and RRC connected (RRC_CONNECTED) state. In order to enable terminal devices in the network to have the opportunity to perform random access, the network device needs to configure PRACH resources for the terminal devices to receive the random access preamble from the terminal devices. As an example, the terminal device can obtain the PRACH configuration through high-level signaling, thereby obtaining the PRACH resources in the time domain. Each PRACH configuration has a corresponding index, and each PRACH configuration corresponds to a distribution of random access opportunities (RO). The RO distribution is usually defined by the radio frame index, the subframe number within the frame, and the starting symbol within the time slot.

[0031] In the actual random access process, the terminal device first monitors the system information sent by the network device, such as system information block (SIB) 1 and SIB2, to understand the configuration and availability of PRACH resources. Then, based on the obtained PRACH configuration, the terminal device selects a PRACH preamble for random access. The terminal device sends the random access preamble in the predetermined PRACH time slot, and the network device processes it after receiving the preamble.

[0032] In wireless communication systems, network devices need to continuously monitor the PRACH channel and receive random access preambles sent by terminal devices. The energy consumption of network devices is mainly reflected in the process of processing random access requests, including signal reception, decoding, resource allocation and response. Decoding the preambles of multiple terminal devices and detecting collisions requires high signal processing capabilities. Especially in a high-load environment, network devices need to invest more computing resources, which increases energy consumption. The configuration of PRACH resources (for example, allocation in the frequency domain and time domain) affects the energy consumption of network devices. If too many resources are allocated for PRACH monitoring, invalid resource occupation and processing overhead will increase. The activation and management of additional PRACH resources (for example, enhanced PRACH for special scenarios) will also increase the energy consumption of network devices. In the scenario of high-density terminal devices, the frequency of random access conflicts increases, and network devices need to additionally process retransmission and conflict resolution, further increasing energy consumption. Network devices need to perform interference elimination on the received preamble signals, especially in cells with large coverage or high interference environments. This operation requires high computing power, resulting in increased energy consumption.

[0033] PRACH is a periodic, always-present process, and PRACH periodicity can only be changed semi-statically, and these resources cannot be dynamically adjusted to adapt to changes in traffic load or save energy at network devices. In such a cell, PRACH reception must still be performed frequently even when there is no or light traffic, which consumes network energy. According to the current 3GPP specifications, PRACH resources cannot be effectively dynamically adjusted to adapt to changes in traffic load or demand.

[0034] PRACH processing and resource management are important components of network equipment energy consumption, especially in the current and future complex network environment, PRACH load shows significant differences in different wireless communication scenarios. For example, in high-speed mobile scenarios, during the peak hours of high-speed rail and vehicle networking or in small time intervals, users move fast and service cells switch frequently. For another example, in the large-scale Internet of Things scenario corresponding to smart cities, a large number of IoT devices (for example, sensors, smart terminals) are connected to the network. Most devices are low-power devices with long transmission intervals, but there are periodic peaks. A large number of devices trying to access at a certain point in time may cause short-term congestion of the PRACH channel. In emergency or disaster scenarios, sudden events cause a large number of users or devices to access at the same time (for example, calling an emergency number or uploading real-time data). When part of the network is damaged, there will also be instantaneous high loads, and a large number of users will send random access requests at the same time, which is easy to cause channel congestion and preamble code conflicts. In indoor scenarios, users are concentrated in closed spaces (for example, shopping malls, conference centers), and the personnel fluctuations are large. Although data communications are mostly medium and low-speed data requirements, the number of users may be large. Access conflicts may occur when the user density is high, and the load fluctuates significantly as the number of users changes.

[0035] Therefore, the system needs to be able to dynamically adjust PRACH resources according to the load, reduce the energy waste caused by excessive configuration of PRACH resources and constant waking up for detection under low load conditions, and reduce the energy consumption of network devices due to access collisions and excessive invalid detection caused by insufficient PRACH resources under high load conditions. For example, PRACH monitoring resources can be reduced during non-peak hours. During low traffic periods, some processing units of network devices can enter low-power mode and only maintain the minimum PRACH monitoring capability. Increasing PRACH resources during peak hours can reduce PRACH conflicts and random access collision rates, thereby reducing the energy consumption of repeated processing.

[0036] By adaptively adjusting PRACH resources in the time domain, network devices can reduce unnecessary monitoring. In principle, network devices can change PRACH configurations by updating system information or performing RRC reconfiguration. However, frequent updates of system information or frequent RRC reconfiguration can also have adverse effects on network energy saving and signaling overhead.

[0037] To this end, in an embodiment of the present application, the network device can send one or more PRACH configurations to the terminal device, and dynamically adjust the PRACH configuration used by the terminal device, so that the PRACH transmission can adapt to the current traffic and load, network energy-saving requirements, distribution of terminal devices, and changes in time and other factors, thereby optimizing resource utilization and balancing the access performance of the terminal device.

[0038] It can be understood that for traditional terminal devices, such as terminal devices that support lower protocol versions (for example, release 18 and earlier versions in NR), the network device indicates the PRACH configuration for it through system information or RRC messages, which is referred to as the basic PRACH configuration or the benchmark PRACH configuration below. The various PRACH parameters included in the basic PRACH configuration can be adjusted, but need to be updated through system information or RRC messages. The basic PRACH configuration may also be used by terminal devices that support higher versions (for example, release 19 and later protocol versions in NR). At the same time, these high-version terminal devices can also receive one or more additional PRACH configurations sent by the network device, that is, they can obtain additional PRACH resources for uplink access. Since the number of high-version terminal devices may be more in the future, providing them with one or more additional PRACH configurations, and dynamically instructing the terminal device to use the PRACH configuration adapted to the current scenario, can significantly improve the access efficiency of the wireless network, which is particularly suitable for high-density, low-latency and high-speed mobile communication scenarios, and can achieve network energy saving while meeting uplink access requirements.

[0039] In the NR system, the RRC state is extended based on the RRC state of LTE to adapt to more application scenarios and more complex network requirements. New RRC states and some mechanism optimizations are introduced in the NR system. The main RRC states include RRC idle state, RRC connected state and RRC inactive state. In the RRC idle state, the terminal device does not establish an RRC connection with the network device, and only receives cell broadcast information and monitors paging messages. In the RRC connected state, an RRC connection is established between the terminal device and the network device, and real-time data and control signaling can be interacted to maintain real-time communication with the network device. The RRC inactive state is a new state unique to the NR system, introduced in NR release 15 and subsequent versions. It is between the RRC idle state and the RRC connected state, and is used to balance power consumption and signaling efficiency. The terminal device does not need to completely release the connection like the idle state, but can quickly recover to the connected state. Compared with the RRC connected state, it can significantly reduce power consumption and signaling burden. When data transmission is completed, the network device may switch the terminal device from the RRC connected state to the inactive state to reduce power consumption while maintaining a certain connection context. When the terminal device needs to transmit data, it can return to the connected state through the fast recovery process without re-establishing a complete RRC connection. If the terminal device has no data interaction for a long time, the network device may completely release it to the idle state.

[0040] In wireless communication systems (e.g., LTE systems and NR systems), downlink control information (DCI) is a type of control information sent by a network device through a physical downlink control channel (PDCCH) to allocate wireless resources to a terminal device or trigger a specific operation. When a terminal device is in an RRC connected state and in an RRC idle state / RRC inactive state, the signaling it receives is different.

[0041] When the terminal device is in the RRC idle state, only the DCI scrambled by the paging-radio network temporary identifier (P-RNTI) is detected. In the RRC connected state, the terminal device will detect the DCI scrambled by the P-RNTI, and will also detect the DCI scrambled by the cell radio network temporary identifier (C-RNTI). The random access channel (RACH) process based on the PDCCH order (PDCCH order) is a mechanism in which the terminal device directly triggers random access through the PDCCH in the RRC connected state. When the terminal device switches to the target cell, the PRACH process is triggered by the PDCCH order. Alternatively, when the network device detects a connection problem or link failure of the terminal device, but there is downlink data to be sent, it can instruct the terminal device to re-randomly access through the PDCCH order. The network device achieves uplink resynchronization with the terminal device through the PDCCH order. Specifically, it can be achieved through DCI format 1_0 (DCI format 1_0, or DCI 1_0), wherein DCI 1_0 can indicate the allocation information of the downlink physical resource block (PRB), inform the terminal device on which resources to receive data, and can also be used to trigger the uplink physical shared channel (PUSCH) transmission of the uplink, and specify its related resources in the random access process. DCI 1_0 is used to trigger the terminal device to send PRACH through the PDCCH order. C-RNTI is usually used to scramble DCI 1_0. C-RNTI is used to identify a specific terminal device. This field ensures that the trigger command is only effective for the terminal device to avoid conflicts between multiple users.

[0042] The network device sends DCI 1_0 to the terminal device with the feature through PDCCH order. Using C-RNTI to scramble DCI1_0 can ensure that the message is only parsed by the terminal device. DCI 1_0 includes information such as PRACH resource indication field and preamble index to guide the terminal device to send PRACH on the specified resource. According to DCI 1_0, the terminal device sends the preamble on the specified PRACH resource to complete the random access attempt. The network device responds to the PRACH sent by the terminal device through a random access response (RAR) message to complete the access process. PDCCH order RACH bypasses the waiting step of the conventional random access process and significantly reduces the access delay. By specifying the PRACH resource location and preamble index, it adapts to different network loads and scenario requirements. Unique PRACH resources and preambles can be allocated to terminal devices, minimizing access conflicts between multiple users. In scenarios with dense users, PDCCH order can effectively divert access requests and alleviate PRACH conflicts. Provide low-latency random access triggering for high-mobility users (e.g., Internet of Vehicles, train communications), reduce delays and failures during handovers, and ensure connection stability.

[0043] As mentioned above, if the network device provides one or more PRACH configurations (hereinafter also referred to as the second PRACH configuration) in addition to the basic PRACH configuration (hereinafter also referred to as the first PRACH configuration) for a higher-version terminal device, that is, the network device provides additional PRACH resources for the higher-version terminal device, then when the above-mentioned situation occurs, for example, the network device detects that the uplink of the terminal is out of sync or there is downlink data to be sent to the terminal but the terminal device has not yet been synchronized, how the network device triggers random access of the terminal device, there is currently no solution.

[0044] To this end, an embodiment of the present application proposes that the network device sends a first DCI to the terminal device to trigger a random access process or indicate a first PRACH resource, thereby providing the terminal device with additional random access opportunities or resources, which is conducive to achieving rapid recovery of uplink synchronization, while optimizing the allocation of network resources and improving the flexibility of the system.

[0045] Combine the following Figure 2 , the embodiments of the present application are introduced in detail.

[0046] Figure 2 A flowchart of a wireless communication method provided in an embodiment of the present application. Figure 2 The method 200 shown can be performed by a terminal device and a network device. The terminal device can be, for example, Figure 1 The terminal device 120 shown in FIG. 1 , the network device may be, for example, Figure 1 The network device 110 shown in FIG.

[0047] See also Figure 2 , in step 210, the network device sends a first DCI to the terminal device.

[0048] Accordingly, in step 220, the terminal device receives the first DCI sent by the network device.

[0049] Among them, the first DCI is used to trigger a random access process or to indicate a first PRACH resource. Optionally, the first PRACH resource can be a PRACH resource indicated by a first PRACH configuration, and / or a PRACH resource indicated by a second PRACH configuration. Among them, the first PRACH configuration may, for example, refer to the above-mentioned basic PRACH configuration for a traditional terminal device (for example, a low-version terminal device); the second PRACH configuration, for example, refers to the above-mentioned additional PRACH configuration for a specific terminal device (for example, a high-version terminal device). That is, the PRACH resource indicated by the second PRACH configuration is an additional PRACH resource configured for a specific terminal device (for example, a high-version terminal device). In some implementations, the second PRACH configuration may be associated with the RRC state of the terminal device (for example, RRC idle state, RRC connected state, RRC inactive state). For example, if a second PRACH configuration is associated with an RRC idle state, the PRACH resources indicated by the second PRACH configuration information are applicable to random access by a terminal device in the RRC idle state; for another example, if a second PRACH configuration is associated with an RRC connected state, the PRACH resources indicated by the second PRACH configuration information are applicable to random access by a terminal device in the RRC connected state. Optionally, the RRC state associated with the second PRACH configuration can be configured by the network device through high-layer signaling.

[0050] In this case, optionally, the first DCI may include ninth information, and the ninth information is used to indicate whether the first PRACH resource is a PRACH resource indicated by the first PRACH configuration or a PRACH resource indicated by the second PRACH configuration. For example, the ninth information may be used for one or more of the following: indicating that the first PRACH resource is a PRACH resource indicated by the first PRACH configuration; or indicating that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration; triggering a random access process based on the PRACH resource indicated by the first PRACH configuration; indicating the index or sequence number of the PRACH configuration corresponding to the first PRACH resource. In addition, optionally, the ninth information may also include other information associated with the first PRACH resource (for example, the first PRACH resource indicated by the second PRACH configuration). As an example, in the case where the first PRACH resource is the PRACH resource indicated by the second PRACH configuration, the index or sequence number of the PRACH configuration corresponding to the first PRACH resource can indicate which of the multiple second PRACH configurations the PRACH resource indicated by the second PRACH configuration is used for random access by the terminal device, or in other words, the terminal device performs random access on the second PRACH configuration corresponding to the index or sequence number indicated by the ninth information. For example, the second PRACH configuration #1 is for a terminal device in a connected state, and the second PRACH configuration #2 is for a terminal device in an idle state. Then, when the ninth information indicates the second PRACH configuration #1, it indicates that the terminal device in the connected state performs random access on the PRACH resource indicated by the second PRACH configuration #1, and when the ninth information indicates the second PRACH configuration #2, it indicates that the terminal device in the idle state performs random access on the PRACH resource indicated by the second PRACH configuration #2.

[0051] Optionally, the first DCI may include a first field, for example, the first field may be a frequency domain resource allocation field. By different values ​​of the frequency domain resource allocation field, the above different contents may be indicated, for example, indicating that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration, or indicating an index or sequence number of a PRACH configuration corresponding to the first PRACH resource, or triggering a random access process on the first PRACH resource. The frequency domain resource allocation field carrying the ninth information may be compatible with existing existing systems and efficiently utilize the fields in the first DCI.

[0052] The first DCI format may be, for example, DCI 1_0. In one implementation, the first DCI is encrypted based on C-RNTI. In this case, the first DCI may be the PDCCH order mentioned above; in another implementation, the first DCI is encrypted based on P-RNTI. In the case where the first DCI is encrypted based on P-RNTI, a terminal device in any RRC state may receive (for example, periodically receive) the first DCI, thereby improving its random access performance, and by reasonably applying certain fields in the first DCI, the update of PRACH resources may be achieved without incurring additional overhead. It can be understood that since the transmission interval of the first DCI encrypted with P-RNTI may be longer, the update of the first DCI is slower for a terminal device in an RRC connected state. In this case, the random access process of the terminal device may be triggered or additional PRACH resources may be indicated in combination with the aforementioned PDCCH order. That is to say, for a terminal device in the RRC connected state, it may receive a PDCCH order (i.e., a C-RNTI-encrypted DCI) to trigger a random access procedure or indicate PRACH resources for the random access procedure, or it may receive a P-RNTI-encrypted first DCI to trigger a random access procedure or indicate PRACH resources for the random access procedure.

[0053] The DCI based on P-RNTI scrambling generally includes a short message indication field, a short message field, a scheduling information field, and reserved bits, etc. As shown in Table 1, the short message field generally includes 2 bits, and the content corresponding to the values ​​of the 2 bits can be referred to in Table 1, for example.

[0054] Table 1

[0055] Bit Domain Short message indication 00 reserve 01 Include only scheduling information 10 Include only short messages 11 Includes both scheduling information and short messages

[0056] When the terminal device detects the P-RNTI-scrambled DCI, it performs a cyclic redundancy check (CRC) check and then determines whether the DCI includes a short message or scheduling information, or both scheduling information and a short message. In other words, the terminal device needs to first read the short message indication field and then determine the contents of other fields based on the values ​​of the two bits in the short message indication field.

[0057] The short message field in the DCI is usually 8 bits. If the DCI only carries scheduling information for paging, this field is reserved (or in other words, reserved).

[0058] The scheduling information field in the DCI usually carries information about uplink resources associated with the paging message of the network device, etc. For example, it may include one or more of the following:

[0059] Frequency domain resource assignment: If only short messages are carried, this field is reserved. The size of this field is related to the size of control resource set (CORESET) 0;

[0060] Time domain resource assignment: 4 bits. If only short messages are carried, this field is reserved.

[0061] Virtual resource blocks (VRB) to physical resource blocks (PRB) mapping (VRB-to-PRB mapping): 1 bit. If only short messages are carried, this field is reserved.

[0062] Modulation and coding scheme: 5 bits. If only short messages are carried, this field is reserved.

[0063] Transmission block (TB) scaling: 2 bits. If only short messages are carried, this field is reserved.

[0064] Tracking reference signal (TRS) availability indication (TRSavailability indication): If TRS-ResourceSetConfig is configured, it is 1, 2, 3, 4, 5 or 6 bits, otherwise it is 0 bit.

[0065] The DCI may also include reserved bits. For shared spectrum channel access operations in frequency range 1 or operations in frequency range (FR) 2-2, the reserved bits are (8-M) bits; for cells that do not use shared spectrum channel access, the reserved bits are (6-M) bits, where M is the number of bits in the above-mentioned "TRS availability indication" field.

[0066] In the following, several possible implementations of the first DCI are described in detail in combination with Embodiment 1 to Embodiment 5.

[0067] Example 1

[0068] In embodiment 1, the first DCI may be scrambled based on the P-RNTI. The first DCI includes a short message indication field, and the short message indication field is used to indicate first information, and the first information is related to random access. That is, the first information related to random access is carried in the short message indication field in the first DCI to trigger the random access process or to indicate the first PRACH resource.

[0069] The first information is used, for example, to indicate that: the first DCI includes only the second information; the first DCI includes a short message and / or the second information; or the first DCI includes scheduling information and / or the second information; or the first DCI includes scheduling information, a short message, and the second information. The second information is used to trigger a random access procedure or to indicate a first PRACH resource. The first information may include, for example, two bits, and the values ​​of the two bits are 00, 01, 10, or 11.

[0070] As an example, as shown in Table 2, the value of the short message indication field is 01, indicating that the first DCI only includes scheduling information; the value of the short message indication field is 10, indicating that the first DCI includes a short message and / or second information; the value of the short message indication field is 11; indicating that the first DCI includes both scheduling information and a short message. The second information is used to trigger a random access process or to indicate a first PRACH resource.

[0071] Table 2

[0072] Bit Domain Short message indication 00 reserve 01 Include only scheduling information 10 Including short message and / or second message 11 Includes both scheduling information and short messages

[0073] For another example, as shown in Table 3, the value of the short message indication field is 01, indicating that the first DCI includes only scheduling information; the value of the short message indication field is 10, indicating that the first DCI includes a short message; the value of the short message indication field is 11; indicating that the first DCI includes both scheduling information and a short message and / or second information (that is, may include scheduling information and a short message, may include scheduling information and second information, or may include scheduling information, a short message and second information). The second information is used to trigger a random access process or to indicate a first PRACH resource.

[0074] Table 3

[0075] Bit Domain Short message indication 00 reserve 01 Include only scheduling information 10 Include only short messages 11 Includes both scheduling information and short messages and / or second information

[0076] For another example, as shown in Table 4, the value of the short message indication field is 00, indicating that the first DCI includes the second information; the value of the short message indication field is 01, indicating that the first DCI includes scheduling information; the value of the short message indication field is 10, indicating that the first DCI includes a short message; the value of the short message indication field is 11; indicating that the first DCI includes both scheduling information and a short message. The second information is used to trigger a random access process or to indicate a first PRACH resource.

[0077] Table 4

[0078]

[0079]

[0080] Example 2

[0081] In the implementation shown in Table 2 of Example 1, the value of the short message indication field is 10, indicating that the first DCI includes a short message and / or the second information. At this time, the terminal device may still be unable to determine whether the first DCI specifically includes a short message, includes the second information, or includes the short message and the second information at the same time, based on the value of the short message indication field being 10. Similarly, in the implementation shown in Table 3 of Example 1, the value of the short message indication field is 11, indicating that the first DCI includes scheduling information, and includes a short message and / or the second information at the same time. At this time, the terminal device may still be unable to determine whether the first DCI specifically includes scheduling information and a short message, includes scheduling information and the second information, or includes scheduling information, a short message and the second information at the same time, based on the value of the short message indication field being 11.

[0082] To this end, in embodiment 2, when the short message indication field indicates the first information, the first DCI may further include third information. The third information is used to indicate, for example, one or more of the following states: the first DCI includes the second information; the first DCI does not include the second information; the first DCI includes a short message; the first DCI does not include a short message; the first DCI only includes the second information; the first DCI only includes the short message; the first DCI includes the short message and the second information.

[0083] As an example, the third information may be 1 bit, and its value may include a first value or a second value. The first value is 1 and the second value is 0; or the first value is 0 and the second value is 1. For example, the value of the third information is the first value, indicating that the first DCI includes the second information, and the value of the third information is the second value, indicating that the first DCI does not include the second information. For another example, the value of the third information is the first value, indicating that the first DCI includes a short message, and the value of the third information is the second value, indicating that the first DCI does not include a short message. For another example, the value of the third information is the first value, indicating that the first DCI does not include a short message, and the value of the third information is the second value, indicating that the first DCI does not include the second information.

[0084] For another example, the third information may be 2 bits. In this case, the state indicated by the third information may be: including a short message; including the second information; including both a short message and the second information. Different values ​​of the third information indicate different states. Taking Table 2 as an example, the value of the short message indication field is 10, indicating that the first DCI includes a short message and / or the second information. In this case, the terminal device can determine whether the first DCI includes only a short message, only the second information, or both a short message and the second information based on the value of the third information. Taking Table 3 as an example, the value of the short message indication field is 11, indicating that the first DCI includes scheduling information, and includes a short message and / or the second information. In this case, the terminal device can determine whether the first DCI includes scheduling information and a short message, or includes scheduling information and the second information, or includes scheduling information, a short message and the second information based on the value of the third information.

[0085] Example 3

[0086] In embodiment 3, the first DCI may include fourth information. The fourth information may include, for example, one or more of the following: random access preamble index; uplink (UL) / supplementary uplink (SUL) indicator (UL / SUL indicator); synchronous signal physical broadcast channel (SS / PBCH) index (SS / PBCHindex); PRACH mask index (PRACH Mask index); fifth information for indicating time domain information of the first PRACH resource; sixth information for indicating a subset index corresponding to the first PRACH resource in the configured PRACH resource; seventh information for indicating whether the first PRACH resource is activated. In addition, optionally, the first DCI may also include a reserved bit.

[0087] First, the random access preamble index, UL / SUL indicator, SS / PBCH index, and PRACH mask index are briefly introduced. For the random access preamble index, it is configured according to the ra-PreambleIndex in the high-level protocol. If the DCI only carries short messages, this field is retained. For the UL / SUL indicator, if the value of the "Random Access Preamble Index" field is not all 0, and the terminal device has configured the supplementary uplink (supplementaryUplink) in the serving cell configuration (ServingCellConfig) in the cell, then this field indicates the uplink carrier used to send PRACH in the cell according to the protocol, otherwise the field is retained, and if the DCI only carries short messages, the field is retained. For the SS / PBCH index, if the value of the "Random Access Preamble Index" field is not all 0, then the field indicates the SS / PBCH used to determine the RACH timing of PRACH transmission, otherwise the field is retained, and if it only carries short messages, the field is retained. For the PRACH mask index, if the value of the "Random Access Preamble Index" field is not all 0, then this field indicates according to the protocol that the RACH opportunity associated with the SS / PBCH indicated by the "SS / PBCH Index" field is used for PRACH transmission, otherwise the field is retained. If only short messages are carried, the field is retained.

[0088] It can be understood that the aforementioned PDCCH order will generally also include a random access preamble index, a UL / SUL indicator, a SS / PBCH index, and a PRACH mask index, wherein the aforementioned PDCCH order is generally based on C-RNTI scrambling. In some implementations, in Example 3, the first DCI may be based on C-RNTI scrambling, but the difference from the PDCCH order is that the first DCI may also include fifth information, sixth information, and seventh information, and the fifth information, sixth information, and seventh information are associated with the PRACH resources indicated by the second PRACH configuration, that is, the PRACH resources indicated by the fifth information, sixth information, and seventh information are additional PRACH resources configured for a specific terminal device (for example, a high-version terminal device). Therefore, the first DCI scrambled by C-RNTI in the embodiment of the present application can also be used to indicate relevant information of the PRACH resources indicated by the second PRACH configuration. Among them, the first DCI scrambled by C-RNTI can be for a terminal device in an RRC connected state.

[0089] In some other implementations, in Example 3, the first DCI may also be scrambled based on P-RNTI. Similar to the PDCCH order based on C-RNTI scrambling, the first DCI may also include one or more of a random access preamble index, a UL / SUL indicator, a SS / PBCH index, a PRACH mask index, and / or include one or more of the fifth information, the sixth information, and the seventh information associated with the PRACH resource indicated by the second PRACH configuration. Among them, the first DCI scrambled by P-RNTI may be for a terminal device in an RRC connected state, an RRC idle state, or an RRC inactive state.

[0090] The fifth information is used to indicate the time domain information of the first PRACH resource, and the time domain information includes, for example, information of a radio frame interval x (or period) and / or a radio frame offset y (i.e., the offset of the radio frame where the PRACH resource is located relative to a certain radio frame) (e.g., the indication sequence numbers of x and y). The frame number of the radio frame where the first PRACH resource is located is modulo x to obtain y, i.e., n f mod x=y,n f is the frame number of the radio frame where the first PRACH resource is located, x is the radio frame interval of the first PRACH resource, and y is the radio frame offset. The radio frame interval x may be the parameter x shown in Table 6.3.3.2 of Protocol 38.211, and the radio frame offset y may be the parameter y shown in Table 6.3.3.2 of Protocol 38.211.

[0091] The sixth information is used to indicate the subset index corresponding to the first PRACH resource in the configured PRACH resources. If the network device provides multiple additional PRACH resources for a high-version terminal device through the second PRACH configuration, and the first PRACH resource currently required to be indicated to the terminal device for uplink access through the first DCI is a PRACH resource subset formed by several PRACH resources among these multiple PRACH resources, the first DCI includes the sixth information to indicate the index of the PRACH resource subset, so that the terminal device determines the first PRACH resource for uplink access based on the index.

[0092] Since the first DCI scrambled by the P-RNTI may be sent periodically, the first DCI may further include seventh information to indicate whether the first PRACH resource is activated.

[0093] Example 4

[0094] In embodiment 4, the first DCI may be encrypted based on the P-RNTI. The first DCI may include a short message field. The fourth information mentioned above may be carried in the short message field. For example, the short message field in the first DCI may include one or more of the following: a random access preamble index, a UL / SUL indicator, a SS / PBCH index, a PRACH mask index, the fifth information, the sixth information, and the seventh information. Here, the fourth information is carried in the short message field in the first DCI, considering that there are usually remaining bits in the short message field. For example, the 5th to 8th bits in the 8-bit short message field may be remaining, so the 5th to 8th bits in the short message field can be used to carry the fourth information.

[0095] In addition, if the first DCI includes a reserved bit, the fourth information may also be carried in the reserved bit. For example, the reserved bit in the first DCI may include one or more of the following: a random access preamble index, a UL / SUL indicator, a SS / PBCH index, a PRACH mask index, the fifth information, the sixth information, and the seventh information.

[0096] When the parameters included in the fourth information are different, the number of bits required to carry the fourth information is also different. Therefore, optionally, the network device may send the eighth information to the terminal device; accordingly, the terminal device receives the eighth information sent by the network device. The eighth information may be, for example, high-layer signaling. Among them, the eighth information is used to indicate the position and / or number of bits used to carry the fourth information in the first DCI, for example, the eighth information is used to indicate the position and / or number of one or more bits used to carry the fourth information in the short message field or the reserved bit, that is, the eighth information indicates which bits in the short message field or the reserved bit are used to carry the fourth information. As an example, assuming that the fourth information includes the seventh information, the seventh information is used to indicate whether the first PRACH resource is activated. At this time, the eighth information may indicate which bit in the short message field or the reserved bit carries the seventh information, wherein the value of the bit is 0, indicating that the first PRACH resource is not activated, and the value of the bit is 1, indicating that the first PRACH resource is activated.

[0097] Example 5

[0098] In embodiment 5, the first DCI may include a first field, and when the value of the first field is a first value, the first DCI is used to trigger a random access process or to indicate a first PRACH resource. For example, the first field is a frequency domain resource allocation field. For another example, the first field is a time domain resource allocation. The first value may be, for example, a value corresponding to when all bits in the first field are 1, or may be a value corresponding to when all bits in the first field are 0.

[0099] As an example, when the values ​​of the bits of the frequency domain resource allocation field in the first DCI are all 0, it indicates that the first DCI is used to trigger a random access procedure or to indicate a first PRACH resource. Using the values ​​of the bits of the frequency domain resource allocation field to be all 0 to indicate that the first DCI is used to trigger a random access procedure or to indicate a first PRACH resource can be compatible with existing systems and can efficiently utilize the fields in the first DCI.

[0100] Combination of the above Figure 1 to Figure 2 , describes the method embodiment of the present application in detail, and the following is combined with Figures 3 to 5 , describes the device embodiment of the present application in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so the parts not described in detail can refer to the previous method embodiment.

[0101] Figure 3 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application. Figure 3 The terminal device 300 shown may include a transceiver unit 310. The transceiver unit 310 is used to receive a first DCI sent by a network device, wherein the first DCI is used to trigger a random access process or to indicate a first PRACH resource.

[0102] In some implementations, the first DCI is scrambled based on a paging radio network temporary identifier P-RNTI; or, the first DCI is scrambled based on a cell radio network temporary identifier C-RNTI.

[0103] In some implementations, the first DCI includes a short message indication field, where the short message indication field is used to indicate first information, where the first information is related to random access.

[0104] In some implementations, the first information is used to indicate that: the first DCI includes only the second information; or, the first DCI includes a short message and / or the second information; or, the first DCI includes scheduling information and / or the second information. The second information is used to trigger a random access procedure or to indicate the first PRACH resource.

[0105] In some implementations, the first information includes two bits, and the values ​​of the two bits are 00, 01, 10, or 11.

[0106] In some implementations, when the short message indication field indicates the first information, the first DCI also includes third information, and the third information is used to indicate one or more of the following states: the first DCI includes the second information; the first DCI does not include the second information; the first DCI includes a short message; the first DCI does not include a short message; the first DCI only includes the second information; the first DCI only includes a short message; the first DCI includes a short message and the second information.

[0107] In some implementations, the first DCI includes fourth information, and the fourth information includes one or more of the following: a random access preamble index; a UL / SUL indicator; a SS / PBCH index; a PRACH mask index; fifth information for indicating time domain information of the first PRACH resource; sixth information for indicating a subset index corresponding to the first PRACH resource in the configured PRACH resources; and seventh information for indicating whether the first PRACH resource is activated.

[0108] In some implementations, the first DCI includes a short message field or a reserved bit, and the fourth information is carried in the short message field or the reserved bit.

[0109] In some implementations, the first PRACH resource is a PRACH resource indicated by a first PRACH configuration, or a PRACH resource indicated by a second PRACH configuration, wherein the PRACH resource indicated by the second PRACH configuration is an additional PRACH resource configured for a specific terminal device.

[0110] In some implementations, the method further includes: the terminal device receiving eighth information sent by the network device, the eighth information being used to indicate a position of one or more bits in the short message field or the reserved bit used to carry the fourth information.

[0111] In some implementations, the first DCI includes ninth information, and the ninth information is used to indicate that the first PRACH resource is a PRACH resource indicated by the first PRACH configuration, or is used to indicate that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration.

[0112] In some implementations, the second PRACH configuration is associated with an RRC state of the terminal device, and the RRC state associated with the second PRACH configuration is configured by the network device through high-layer signaling.

[0113] In some implementations, the first DCI includes a first field. When the value of the first field is a first value, the first DCI is used to trigger a random access process or to indicate the first PRACH resource.

[0114] In some implementations, the first field is a frequency domain resource allocation field.

[0115] In some implementations, the first value is a value corresponding to when all bits in the first field are 0.

[0116] It can be understood that the transceiver unit 310 can be, for example, a transceiver 530. In addition, optionally, the terminal device 300 further includes a processor 510 and a memory 520, for details, see Figure 5 .

[0117] Figure 4 A schematic diagram of the structure of a network device provided in an embodiment of the present application. Figure 4 The network device 400 shown may include a transceiver unit 410. The transceiver unit 410 is configured to send a first DCI to a terminal device, wherein the first DCI is used to trigger a random access procedure or to indicate a first PRACH resource.

[0118] In some implementations, the first DCI is scrambled based on a paging radio network temporary identifier P-RNTI; or, the first DCI is scrambled based on a cell radio network temporary identifier C-RNTI.

[0119] In some implementations, the first DCI includes a short message indication field, where the short message indication field is used to indicate first information, where the first information is related to random access.

[0120] In some implementations, the first information is used to indicate that: the first DCI includes only the second information; or, the first DCI includes a short message and / or the second information; or, the first DCI includes scheduling information and / or the second information. The second information is used to trigger a random access procedure or to indicate the first PRACH resource.

[0121] In some implementations, the first information includes two bits, and the values ​​of the two bits are 00, 01, 10, or 11.

[0122] In some implementations, when the short message indication field indicates the first information, the first DCI also includes third information, and the third information is used to indicate one or more of the following states: the first DCI includes the second information; the first DCI does not include the second information; the first DCI includes a short message; the first DCI does not include a short message; the first DCI only includes the second information; the first DCI only includes a short message; the first DCI includes a short message and the second information.

[0123] In some implementations, the first DCI includes fourth information, and the fourth information includes one or more of the following: a random access preamble index; a UL / SUL indicator; a SS / PBCH index; a PRACH mask index; fifth information for indicating time domain information of the first PRACH resource; sixth information for indicating a subset index corresponding to the first PRACH resource in the configured PRACH resources; and seventh information for indicating whether the first PRACH resource is activated.

[0124] In some implementations, the first DCI includes a short message field or a reserved bit, and the fourth information is carried in the short message field or the reserved bit.

[0125] In some implementations, the first PRACH resource is a PRACH resource indicated by a first PRACH configuration, or a PRACH resource indicated by a second PRACH configuration, wherein the PRACH resource indicated by the second PRACH configuration is an additional PRACH resource configured for a specific terminal device.

[0126] In some implementations, the method further includes: the terminal device receiving eighth information sent by the network device, the eighth information being used to indicate a position of one or more bits in the short message field or the reserved bit used to carry the fourth information.

[0127] In some implementations, the first DCI includes ninth information, and the ninth information is used to indicate that the first PRACH resource is a PRACH resource indicated by the first PRACH configuration, or is used to indicate that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration.

[0128] In some implementations, the second PRACH configuration is associated with an RRC state of the terminal device, and the RRC state associated with the second PRACH configuration is configured by the network device through high-layer signaling.

[0129] In some implementations, the first DCI includes a first field. When the value of the first field is a first value, the first DCI is used to trigger a random access process or to indicate the first PRACH resource.

[0130] In some implementations, the first field is a frequency domain resource allocation field.

[0131] In some implementations, the first value is a value corresponding to when all bits in the first field are 0.

[0132] It can be understood that the transceiver unit 410 can be, for example, a transceiver 530. In addition, optionally, the network device 400 further includes a processor 510 and a memory 520, for details, see Figure 5 .

[0133] Figure 5 It is a schematic structural diagram of a device for communication according to an embodiment of the present application. Figure 5 The dotted line shown in indicates that the unit or module is optional. The apparatus 500 may be used to implement the method described in the above method embodiment. The apparatus 500 may be, for example, a chip, a terminal device or a network device.

[0134] The device 500 may include one or more processors 510. The processor 510 may support the device 500 to implement the method described in the aforementioned method embodiment. The processor 510 may be a general-purpose processor or a special-purpose processor. For example, the processor 510 may be a central processing unit (CPU). Alternatively, the processor 510 may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or may be any conventional processor, etc.

[0135] The apparatus 500 may further include one or more memories 520. The memory 520 stores a program, which can be executed by the processor 510, so that the processor 510 executes the method described in the above method embodiment. The memory 520 may be independent of the processor 510, or may be integrated in the processor 510.

[0136] The apparatus 500 may further include a transceiver 530. The processor 510 may communicate with other devices or chips through the transceiver 530. For example, the processor 510 may transmit and receive data with other devices or chips through the transceiver 530.

[0137] The embodiment of the present application also provides a communication system. The communication system includes the above-mentioned terminal device and network device. In some implementations, the system also includes other devices that interact with the terminal device and the network device.

[0138] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal device or a network device provided in the present application, and the program enables a computer to execute the method performed by the terminal device or the network device in each embodiment of the present application.

[0139] The embodiment of the present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal device or network device provided in the embodiment of the present application, and the program enables the computer to execute the method performed by the terminal device or network device in each embodiment of the present application.

[0140] The embodiment of the present application also provides a computer program. The computer program can be applied to the terminal device or network device provided in the embodiment of the present application, and the computer program enables a computer to execute the method executed by the terminal device or network device in each embodiment of the present application.

[0141] It should be understood that the terms "system" and "network" in the embodiments of the present application can be used interchangeably. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third" and "fourth" in the specification and claims of the present application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions.

[0142] In the embodiments of the present application, the "indication" mentioned can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B.

[0143] In the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0144] In the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship of indication and being indicated, configuration and being configured, etc.

[0145] In the embodiments of the present application, "pre-definition" or "pre-configuration" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal device and a network device), and the present application does not limit the specific implementation method. For example, pre-definition can refer to what is defined in the protocol.

[0146] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0147] In the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0148] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0149] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0150] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0151] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0152] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center integrated with one or more available media. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0153] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: The terminal device receives first downlink control information DCI sent by the network device, wherein the first DCI is used to trigger a random access process or to indicate a first physical random access channel PRACH resource.

2. The method according to claim 1, characterized in that: The first DCI is scrambled based on a paging radio network temporary identifier P-RNTI; or, The first DCI is scrambled based on a cell radio network temporary identifier C-RNTI.

3. The method according to claim 1 or 2, characterized in that: The first DCI includes a short message indication field, where the short message indication field is used to indicate first information, where the first information is related to random access.

4. The method according to claim 3, characterized in that The first information is used to indicate: The first DCI includes only the second information; or, The first DCI includes a short message and / or second information; or, The first DCI includes scheduling information and / or second information; or, The first DCI includes scheduling information, a short message and second information; The second information is used to trigger a random access process or to indicate the first PRACH resource.

5. The method according to claim 4, characterized in that The first information includes two bits, and the values ​​of the two bits are 00, 01, 10 or 11.

6. The method according to any one of claims 3 to 5, characterized in that In a case where the short message indication field indicates the first information, the first DCI further includes third information, where the third information is used to indicate one or more of the following states: The first DCI includes the second information; The first DCI does not include the second information; The first DCI includes a short message; The first DCI does not include a short message; The first DCI includes only the second information; The first DCI includes only short messages; The first DCI includes a short message and the second information.

7. The method according to any one of claims 1 to 6, characterized in that The first DCI includes fourth information, where the fourth information includes one or more of the following: Random access preamble index; Uplink UL / supplementary uplink SUL indicator; Synchronization signal broadcast channel SS / PBCH index; PRACH mask index; Fifth information, used to indicate time domain information of the first PRACH resource; Sixth information, used to indicate a subset index corresponding to the first PRACH resource in the configured PRACH resources; The seventh information is used to indicate whether the first PRACH resource is activated.

8. The method according to claim 7, characterized in that The first DCI includes a short message field or a reserved bit, and the fourth information is carried in the short message field or the reserved bit.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: The terminal device receives the eighth information sent by the network device, where the eighth information is used to indicate the position and / or number of bits in the first DCI used to carry the fourth information.

10. The method according to any one of claims 1 to 9, characterized in that The first PRACH resource is a PRACH resource indicated by a first PRACH configuration, or a PRACH resource indicated by a second PRACH configuration, wherein the PRACH resource indicated by the second PRACH configuration is an additional PRACH resource configured for a specific terminal device.

11. The method according to any one of claims 1 to 10, characterized in that The first DCI includes ninth information, where the ninth information is used for one or more of the following: Indicating that the first PRACH resource is a PRACH resource indicated by the first PRACH configuration; Indicating that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration; triggering a random access procedure of a PRACH resource indicated by a first PRACH configuration; Indicates the index or sequence number of the PRACH configuration corresponding to the first PRACH resource.

12. The method according to claim 11, characterized in that The first DCI includes a first field, and the ninth information is carried in the first field.

13. The method according to claim 12, characterized in that The first field is a frequency domain resource allocation field.

14. The method according to any one of claims 10 to 13, characterized in that The second PRACH configuration is associated with a radio resource control (RRC) state of the terminal device, and the RRC state associated with the second PRACH configuration is configured by the network device through high-layer signaling.

15. The method according to any one of claims 1 to 14, characterized in that The first DCI includes a first field. When the value of the first field is a first value, the first DCI is used to trigger a random access procedure or to indicate the first PRACH resource.

16. The method according to claim 15, characterized in that The first field is a frequency domain resource allocation field.

17. The method according to claim 15 or 16, characterized in that The first value is a value corresponding to when all bits in the first field are 0.

18. A communication method, characterized in that: include: The network device sends first downlink control information DCI to the terminal device, wherein the first DCI is used to trigger a random access process or to indicate a first physical random access channel PRACH resource.

19. The method according to claim 18, characterized in that The first DCI is scrambled based on a paging radio network temporary identifier P-RNTI; or, The first DCI is scrambled based on a cell radio network temporary identifier C-RNTI.

20. The method according to claim 18 or 19, characterized in that The first DCI includes a short message indication field, where the short message indication field is used to indicate first information, where the first information is related to random access.

21. The method according to claim 20, characterized in that The first information is used to indicate: The first DCI includes only the second information; or, The first DCI includes a short message and / or second information; or, The first DCI includes scheduling information and / or second information; or, The first DCI includes scheduling information, a short message and second information; The second information is used to trigger a random access process or to indicate the first PRACH resource.

22. The method according to claim 21, characterized in that The first information includes two bits, and the values ​​of the two bits are 00, 01, 10 or 11.

23. The method according to any one of claims 20 to 22, characterized in that In a case where the short message indication field indicates the first information, the first DCI further includes third information, where the third information is used to indicate one or more of the following states: The first DCI includes the second information; The first DCI does not include the second information; The first DCI includes a short message; The first DCI does not include a short message; The first DCI includes only the second information; The first DCI includes only short messages; The first DCI includes a short message and the second information.

24. The method according to any one of claims 18 to 23, characterized in that The first DCI includes fourth information, where the fourth information includes one or more of the following: Random access preamble index; Uplink UL / supplementary uplink SUL indicator; Synchronization signal broadcast channel SS / PBCH index; PRACH mask index; Fifth information, used to indicate time domain information of the first PRACH resource; Sixth information, used to indicate a subset index corresponding to the first PRACH resource in the configured PRACH resources; The seventh information is used to indicate whether the first PRACH resource is activated.

25. The method according to claim 24, characterized in that The first DCI includes a short message field or a reserved bit, and the fourth information is carried in the short message field or the reserved bit.

26. The method according to any one of claims 18 to 25, characterized in that The method further comprises: Sending eighth information to the terminal device, where the eighth information is used to indicate the position and / or number of bits in the first DCI used to carry the fourth information.

27. The method according to any one of claims 18 to 26, characterized in that The first PRACH resource is a PRACH resource indicated by a first PRACH configuration, or a PRACH resource indicated by a second PRACH configuration, wherein the PRACH resource indicated by the second PRACH configuration is an additional PRACH resource configured for a specific terminal device.

28. The method according to any one of claims 18 to 27, characterized in that The first DCI includes ninth information, where the ninth information is used for one or more of the following: Indicating that the first PRACH resource is a PRACH resource indicated by the first PRACH configuration; Indicating that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration; triggering a random access procedure of a PRACH resource indicated by a first PRACH configuration; Indicates the index or sequence number of the PRACH configuration corresponding to the first PRACH resource.

29. The method according to claim 28, characterized in that The first DCI includes a first field, and the ninth information is carried in the first field.

30. The method according to claim 29, characterized in that The first field is a frequency domain resource allocation field.

31. The method according to any one of claims 27 to 29, characterized in that The second PRACH configuration is associated with a radio resource control (RRC) state of the terminal device, and the RRC state associated with the second PRACH configuration is configured by the network device through high-layer signaling.

32. The method according to any one of claims 18 to 31, characterized in that The first DCI includes a first field. When the value of the first field is a first value, the first DCI is used to trigger a random access procedure or to indicate the first PRACH resource.

33. The method according to claim 32, characterized in that The first field is a frequency domain resource allocation field.

34. The method according to claim 32 or 33, characterized in that The first value is a value corresponding to when all bits in the first field are 0.

35. A terminal device, characterized in that: include: The transceiver unit is used to receive first downlink control information DCI sent by a network device, wherein the first DCI is used to trigger a random access process or to indicate a first physical random access channel PRACH resource.

36. The terminal device according to claim 35, characterized in that: The first DCI is scrambled based on a paging radio network temporary identifier P-RNTI; or, The first DCI is scrambled based on a cell radio network temporary identifier C-RNTI.

37. The terminal device according to claim 35 or 36, characterized in that: The first DCI includes a short message indication field, where the short message indication field is used to indicate first information, where the first information is related to random access.

38. The terminal device according to claim 37, characterized in that: The first information is used to indicate: The first DCI includes only the second information; or, The first DCI includes a short message and / or second information; or, The first DCI includes scheduling information and / or second information; or, The first DCI includes scheduling information, a short message and second information; The second information is used to trigger a random access process or to indicate the first PRACH resource.

39. The terminal device according to claim 38, characterized in that: The first information includes two bits, and the values ​​of the two bits are 00, 01, 10 or 11.

40. The terminal device according to any one of claims 37 to 39, characterized in that: In a case where the short message indication field indicates the first information, the first DCI further includes third information, where the third information is used to indicate one or more of the following states: The first DCI includes the second information; The first DCI does not include the second information; The first DCI includes a short message; The first DCI does not include a short message; The first DCI includes only the second information; The first DCI includes only short messages; The first DCI includes a short message and the second information.

41. The terminal device according to any one of claims 35 to 40, characterized in that: The first DCI includes fourth information, where the fourth information includes one or more of the following: Random access preamble index; Uplink UL / supplementary uplink SUL indicator; Synchronization signal broadcast channel SS / PBCH index; PRACH mask index; Fifth information, used to indicate time domain information of the first PRACH resource; Sixth information, used to indicate a subset index corresponding to the first PRACH resource in the configured PRACH resources; The seventh information is used to indicate whether the first PRACH resource is activated.

42. The terminal device according to claim 41, characterized in that: The first DCI includes a short message field or a reserved bit, and the fourth information is carried in the short message field or the reserved bit.

43. The terminal device according to any one of claims 35 to 42, characterized in that: The transceiver unit is also used for: Receive eighth information sent by the network device, where the eighth information is used to indicate a position and / or number of bits in the first DCI used to carry the fourth information.

44. The terminal device according to any one of claims 35 to 43, characterized in that: The first PRACH resource is a PRACH resource indicated by a first PRACH configuration, or a PRACH resource indicated by a second PRACH configuration, wherein the PRACH resource indicated by the second PRACH configuration is an additional PRACH resource configured for a specific terminal device.

45. The terminal device according to any one of claims 35 to 44, characterized in that: The first DCI includes ninth information, where the ninth information is used for one or more of the following: Indicating that the first PRACH resource is a PRACH resource indicated by the first PRACH configuration; Indicating that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration; triggering a random access procedure of a PRACH resource indicated by a first PRACH configuration; Indicates the index or sequence number of the PRACH configuration corresponding to the first PRACH resource.

46. ​​The terminal device according to claim 45, characterized in that: The first DCI includes a first field, and the ninth information is carried in the first field.

47. The terminal device according to claim 46, characterized in that: The first field is a frequency domain resource allocation field.

48. The terminal device according to any one of claims 44 to 47, characterized in that: The second PRACH configuration is associated with a radio resource control (RRC) state of the terminal device, and the RRC state associated with the second PRACH configuration is configured by the network device through high-layer signaling.

49. The terminal device according to any one of claims 35 to 48, characterized in that: The first DCI includes a first field. When the value of the first field is a first value, the first DCI is used to trigger a random access procedure or to indicate the first PRACH resource.

50. The terminal device according to claim 49, characterized in that: The first field is a frequency domain resource allocation field.

51. The terminal device according to claim 49 or 50, characterized in that: The first value is a value corresponding to when all bits in the first field are 0.

52. A network device, characterized in that: include: A transceiver unit is used to send first downlink control information DCI to a terminal device, wherein the first DCI is used to trigger a random access process or to indicate a first physical random access channel PRACH resource.

53. The network device according to claim 52, characterized in that: The first DCI is scrambled based on a paging radio network temporary identifier P-RNTI; or, The first DCI is scrambled based on a cell radio network temporary identifier C-RNTI.

54. The network device according to claim 52 or 53, characterized in that: The first DCI includes a short message indication field, where the short message indication field is used to indicate first information, where the first information is related to random access.

55. The network device according to claim 54, characterized in that The first information is used to indicate: The first DCI includes only the second information; or, The first DCI includes a short message and / or second information; or, The first DCI includes scheduling information and / or second information; or, The first DCI includes scheduling information, a short message and second information; The second information is used to trigger a random access process or to indicate the first PRACH resource.

56. The network device according to claim 54, characterized in that The first information includes two bits, and the values ​​of the two bits are 00, 01, 10 or 11.

57. The network device according to any one of claims 54 to 56, characterized in that: In a case where the short message indication field indicates the first information, the first DCI further includes third information, where the third information is used to indicate one or more of the following states: The first DCI includes the second information; The first DCI does not include the second information; The first DCI includes a short message; The first DCI does not include a short message; The first DCI includes only the second information; The first DCI includes only short messages; The first DCI includes a short message and the second information.

58. The network device according to any one of claims 52 to 57, characterized in that: The first DCI includes fourth information, where the fourth information includes one or more of the following: Random access preamble index; Uplink UL / supplementary uplink SUL indicator; Synchronization signal broadcast channel SS / PBCH index; PRACH mask index; Fifth information, used to indicate time domain information of the first PRACH resource; Sixth information, used to indicate a subset index corresponding to the first PRACH resource in the configured PRACH resources; The seventh information is used to indicate whether the first PRACH resource is activated.

59. The network device according to claim 58, characterized in that The first DCI includes a short message field or a reserved bit, and the fourth information is carried in the short message field or the reserved bit.

60. The network device according to any one of claims 52 to 59, characterized in that: The transceiver unit is also used for: Sending eighth information to the terminal device, where the eighth information is used to indicate the position and / or number of bits in the first DCI used to carry the fourth information.

61. The network device according to any one of claims 52 to 60, characterized in that: The first PRACH resource is a PRACH resource indicated by a first PRACH configuration, or a PRACH resource indicated by a second PRACH configuration, wherein the PRACH resource indicated by the second PRACH configuration is an additional PRACH resource configured for a specific terminal device.

62. The network device according to any one of claims 52 to 61, characterized in that: The first DCI includes ninth information, where the ninth information is used for one or more of the following: Indicating that the first PRACH resource is a PRACH resource indicated by the first PRACH configuration; Indicating that the first PRACH resource is a PRACH resource indicated by the second PRACH configuration; triggering a random access procedure of a PRACH resource indicated by a first PRACH configuration; Indicates the index or sequence number of the PRACH configuration corresponding to the first PRACH resource.

63. The network device according to claim 62, characterized in that The first DCI includes a first field, and the ninth information is carried in the first field.

64. The network device according to claim 63, characterized in that: The first field is a frequency domain resource allocation field.

65. The network device according to any one of claims 61 to 63, characterized in that: The second PRACH configuration is associated with a radio resource control (RRC) state of the terminal device, and the RRC state associated with the second PRACH configuration is configured by the network device through high-layer signaling.

66. The network device according to any one of claims 52 to 65, characterized in that: The first DCI includes a first field. When the value of the first field is a first value, the first DCI is used to trigger a random access procedure or to indicate the first PRACH resource.

67. The network device according to claim 66, characterized in that The first field is a frequency domain resource allocation field.

68. The network device according to claim 66 or 67, characterized in that: The first value is a value corresponding to when all bits in the first field are 0.

69. A terminal device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal device executes the method according to any one of claims 1 to 17.

70. A network device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the network device executes the method according to any one of claims 18 to 34.

71. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 34.

72. A chip, characterized in that: The device comprises a processor, configured to call a program from a memory, so that a device equipped with the chip executes a method according to any one of claims 1 to 34.

73. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 34.

74. A computer program product, characterized in that A program is included, which causes a computer to execute the method according to any one of claims 1 to 34.

75. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 34.

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