A method for random access, a network device, and a terminal device

Abstract

An embodiment of the present invention provides a random access method, a network device, and a terminal device, which are used to enable the network device to control the random access behavior of the terminal according to its own implementation, so that the behavior of the terminal device conforms to the actual situation on the network side. The embodiment of the present invention includes: The terminal device receives indication information sent by the network device, where the indication information is used to indicate whether the terminal device performs timing advance (TA) compensation; according to the indication information, the terminal device determines a TA compensation result, and sends a random access request to the network device through the TA compensation result.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular, to a method for random access, a network device, and a terminal device. Background Art

[0002] Currently, 3GPP (3rd Generation Partnership Project) is researching NTN (Non Terrestrial Network) technology. NTN generally uses satellite communication to provide communication services to ground users. Compared with terrestrial cellular network communication, satellite communication has many unique advantages. First of all, satellite communication is not restricted by the user's geographical location. For example, general terrestrial communication cannot cover areas such as the ocean, high mountains, and deserts where it is impossible to set up communication equipment or where communication coverage is not provided due to sparse population. For satellite communication, since one satellite can cover a large area of the ground, and the satellite can orbit the earth, in theory, every corner of the earth can be covered by satellite communication. Secondly, satellite communication has great social value. Satellite communication can cover remote mountainous areas, poor and backward countries or regions at a relatively low cost, enabling people in these areas to enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital divide with developed regions and promoting the development of these regions. Thirdly, satellite communication has a long communication distance, and the communication cost does not increase significantly as the communication distance increases. Finally, satellite communication has high stability and is not restricted by natural disasters.

[0003] In the NTN system, two types of terminals are supported: those with Timing Advance (TA) compensation capabilities and those without TA compensation capabilities. For these two types of terminals, their random access processes are different. The network needs to maintain different preamble reception windows, send different formats of Random Access Response (RAR), and adopt different scheduling strategies for these two types of terminals, etc. All these will increase the complexity of network implementation. Summary of the Invention

[0004] Embodiments of the present application provide a method for random access, a network device, and a terminal device, so that the network device can control the random access behavior of the terminal according to its own implementation situation, making the behavior of the terminal device conform to the actual situation on the network side.

[0005] A method for random access provided by a first aspect of an embodiment of the present invention includes: a terminal device receives indication information sent by a network device, where the indication information is used to indicate whether the terminal device performs timing advance (TA) compensation; according to the indication information, the terminal device determines a TA compensation result, and sends a random access request to the network device through the TA compensation result.

[0006] Optionally, in some embodiments of the present invention, the indication information includes indication information for activating TA compensation, or indication information for deactivating TA compensation.

[0007] Optionally, in some embodiments of the present invention, the terminal device determines a TA compensation result according to the indication information, including: when the indication information is indication information for deactivating TA compensation, the terminal device determines not to perform TA compensation.

[0008] Optionally, in some embodiments of the present invention, the terminal device determines a TA compensation result according to the indication information, including: when the indication information is indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation capability of the terminal device.

[0009] Optionally, in some embodiments of the present invention, when the indication information is indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation capability of the terminal device, including: when the terminal device has the compensation capability, the terminal device performs TA compensation; when the terminal device does not have the compensation capability, the terminal device does not perform TA compensation.

[0010] Optionally, in some embodiments of the present invention, the terminal device performs TA compensation, including: the terminal device determines an estimated TA result according to the position of the terminal device and the position of the satellite.

[0011] Optionally, in some embodiments of the present invention, sending a random access request to the network device through the TA compensation result includes: when the terminal device has the compensation capability, the terminal device sends the random access request according to the estimated TA result; when the terminal device does not have the compensation capability, the terminal device sends the random access request using an uplink timing aligned with the downlink timing.

[0012] Optionally, in some embodiments of the present invention, if the indication message includes a preset identifier, the indication message is indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is indication information for deactivating TA compensation.

[0013] Optionally, in some embodiments of the present invention, the indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

[0014] Optionally, in some embodiments of the present invention, the terminal device receives the indication information sent by the network device, including: the terminal device receives the indication information sent by the network device in a broadcast, unicast or multicast manner.

[0015] Optionally, in some embodiments of the present invention, after sending a random access request to the network device based on the TA compensation result, the method further includes: the terminal device receives a random access response sent by the network device according to the random access request.

[0016] Optionally, in some embodiments of the present invention, the types of random access include 4-step-rach type and 2-step-rach type.

[0017] A second aspect of the embodiments of the present application provides a random access method, including: the network device sends indication information to the terminal device, and the indication information is used to indicate whether the terminal device performs timing advance (TA) compensation; the network device receives the random access request sent by the terminal device based on the TA compensation result, and the TA compensation result is determined by the terminal device according to the indication information.

[0018] Optionally, in some embodiments of the present invention, the indication information includes indication information for activating TA compensation, or indication information for deactivating TA compensation.

[0019] Optionally, in some embodiments of the present invention, if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

[0020] Optionally, in some embodiments of the present invention, the indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

[0021] Optionally, in some embodiments of the present invention, when the indication information includes indication information for activating TA compensation, the network device receives the random access request sent by the terminal device, including: the network device uses a first reception window to receive the random access request sent by the terminal device to the network device using an estimated TA result, and the estimated TA result is calculated by the terminal device based on the position of the terminal device and the satellite position when the terminal device has the compensation capability.

[0022] Optionally, in some embodiments of the present invention, when the indication information includes indication information for deactivating TA compensation, the network device receives the random access request sent by the terminal device, including: the network device uses a second reception window to receive the random access request sent by the terminal device to the network device using an uplink timing aligned with the downlink timing according to the indication information for deactivating TA compensation.

[0023] Optionally, in some embodiments of the present invention, the window length of the first reception window is less than the window length of the second reception window.

[0024] Optionally, in some embodiments of the present invention, the network device sends indication information to the terminal device, including: the network device sends indication information to the terminal device by means of broadcast, unicast or multicast.

[0025] Optionally, in some embodiments of the present invention, after the network device receives the random access request sent by the terminal device through the TA compensation result, the method further includes: the network device sends a random access response to the terminal device according to the random access request.

[0026] Optionally, in some embodiments of the present invention, the types of the random access include 4step-rach type and 2step-rach type.

[0027] The third aspect of the embodiments of the present invention provides a terminal device, which has the function that the network device can control the random access behavior of the terminal according to its own implementation situation, so that the behavior of the terminal device conforms to the actual situation on the network side. This function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0028] The fourth aspect of the embodiments of the present invention provides a network device, which has the function that the network device can control the random access behavior of the terminal according to its own implementation situation, so that the behavior of the terminal device conforms to the actual situation on the network side. This function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0029] A fifth aspect of the present invention provides a terminal device, including:

[0030] a receiver, a processor, and a transmitter, where the receiver, the processor, and the transmitter are connected through a bus;

[0031] The receiver is configured to receive indication information sent by a network device, where the indication information is used to indicate whether the terminal device performs Timing Advance (TA) compensation;

[0032] The processor is configured to determine a TA compensation result for the terminal device according to the indication information;

[0033] The transmitter is configured to send a random access request to the network device based on the TA compensation result.

[0034] A sixth aspect of the present invention provides a network device, including:

[0035] a receiver and a transmitter, where the receiver and the transmitter are connected through a bus;

[0036] The transmitter is configured to send indication information to a terminal device, where the indication information is used to indicate whether the terminal device performs Timing Advance (TA) compensation;

[0037] The receiver is configured to receive the random access request sent by the terminal device based on the TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information.

[0038] A seventh aspect of the present invention provides a computer-readable storage medium including instructions, which, when running on a computer, cause the computer to execute the method described in the first aspect of the present invention and any optional implementation manner of the first aspect or the second aspect of the present invention and any optional implementation manner of the second aspect.

[0039] An eighth aspect of the present invention provides a computer program product including instructions, which, when running on a computer, cause the computer to execute the method described in the first aspect of the present invention and any optional implementation manner of the first aspect or the second aspect of the present invention and any optional implementation manner of the second aspect.

[0040] A ninth aspect of the present invention provides a chip, where the chip is coupled to a memory in the terminal device, so that when the chip runs, it calls program instructions stored in the memory, causing the terminal device to execute the method described in the first aspect of the present invention and any optional implementation manner of the first aspect.

[0041] The tenth aspect of the present invention provides a chip, which is coupled to the memory in the network device, so that the chip calls the program instructions stored in the memory during operation, enabling the network device to execute the method described in the second aspect of the present invention and any optional implementation manner of the second aspect.

[0042] In the technical solution provided by the embodiments of the present application, the terminal device receives the indication information sent by the network device, and the indication information is used to indicate whether the terminal device performs Timing Advance (TA) compensation; according to the indication information, the terminal device determines the TA compensation result, and sends a random access request to the network device through the TA compensation result. Using this method, the network device can control the random access behavior of the terminal according to its own implementation, so that the behavior of the terminal device conforms to the actual situation on the network side. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1A It is a schematic flowchart of a contention-based random access method in the prior art;

[0044] Figure 1B It is a schematic flowchart of a non-contention-based random access method in the prior art;

[0045] Figure 2 It is a schematic flowchart of random access in the prior art;

[0046] Figure 3 It is a schematic diagram of a random access process with initial TA compensation ability in the prior art;

[0047] Figure 4 It is another schematic diagram of a random access process with initial TA compensation ability in the prior art;

[0048] Figure 5 It is a system architecture diagram of the wireless communication system applied in the embodiments of the present invention;

[0049] Figure 6 It is a schematic diagram of an embodiment of a random access method in the embodiments of the present invention;

[0050] Figure 7 It is another schematic diagram of an embodiment of a random access method in the embodiments of the present invention;

[0051] Figure 8 It is a schematic diagram of an embodiment of a terminal device in the embodiments of the present invention;

[0052] Figure 9 It is a schematic diagram of an embodiment of a network device in the embodiments of the present invention;

[0053] Figure 10Another schematic diagram of the network device in the embodiment of the present invention;

[0054] Figure 11 Another schematic diagram of the terminal device in the embodiment of the present invention. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0056] Communication satellites are classified into LEO (Low-Earth Orbit) satellites, MEO (Medium-Earth Orbit) satellites, GEO (Geostationary Earth Orbit) satellites, HEO (High Elliptical Orbit) satellites, etc. according to different orbital heights. At the current stage, the main research focuses on LEO and GEO. The height range of LEO satellites is 500 km to 1500 km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between terminals is generally less than 20 ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is small, and the requirement for the transmission power of the terminal is not high. For GEO satellites, the orbital height is 35786 km, and the rotation period around the earth is 24 hours. The signal propagation delay of single-hop communication between users is generally 250 ms.

[0057] To ensure the coverage of the satellite and improve the system capacity of the entire satellite communication system, the satellite uses multi-beam to cover the ground. One satellite can form dozens or even hundreds of beams to cover the ground; one satellite beam can cover a ground area with a diameter of dozens to hundreds of kilometers.

[0058] Next, an example of the random access process of the next generation (mobile communication system) (next radio, NR) will be described as follows:

[0059] (1) Random access process in NR Rel-15 version

[0060] In the NR Rel-15 version, the following two random access methods are mainly supported, namely the contention-based random access method and the non-contention-based random access method. As Figure 1A shown, it is a flow schematic diagram of the contention-based random access method in the prior art; as Figure 1BAs shown, it is a schematic diagram of a process of the non-competitive based random access method in the prior art.

[0061] It can be understood that Figure 1A The shown competitive based random access process can be divided into 4 steps. Figure 1B The shown non-competitive based random access process can be divided into 2 steps. The detailed steps are as follows:

[0062] Step 1: The terminal sends Msg (message) 1 to the network, that is, the Random Access Preamble. It can be understood that the terminal selects PRACH (Physical Random Access Channel) resources and sends the selected preamble on the selected PRACH resources. The base station can estimate the uplink Timing based on the preamble. It should be noted that if it is non-competitive based random access, the PRACH resources and preamble can be specified by the base station.

[0063] Step 2: The network sends Msg2 to the terminal, that is, the RAR.

[0064] After the terminal sends the random access preamble, it opens a Random Access Response Window and monitors the PDCCH (Physical Downlink Control Channel) scrambled by RA-RNTI (Random Access Radio Network Temporary Identifier) within the window.

[0065] After the terminal successfully receives the PDCCH scrambled by RA-RNTI, the terminal can obtain the PDSCH (Physical Downlink Shared Channel) scheduled by the PDCCH, which contains the RAR (Random Access Response), and the RAR can include but is not limited to the following information:

[0066] (1) The subheader of the RAR contains the BI (Backoff Indicator) which is used to indicate the backoff time for retransmitting Msg1; (2) The RAPID (Random Access Preamble Identity) in the RAR is used for the network to respond to the received preamble index; (3) The payload of the RAR contains the TAG (Timing Advance Group) which is used to adjust the uplink timing; (4) UL grant: It is used to indicate the uplink resources for scheduling Msg3; (5) TC-RNTI (Temporary Cell Radio Network Temporary Identifier): It is used to scramble the PDCCH (Physical Downlink Control Channel) of Msg4 for initial access.

[0067] If the terminal receives a PDCCH scrambled with RAR-RNTI and the RAR contains the preamble index it sent, the terminal considers that it has successfully received the random access response.

[0068] It can be understood that for non-competitive random access, after the terminal successfully receives Msg2, the random access process ends. For competitive random access, after the terminal successfully receives Msg2, it still needs to continue transmitting Msg3 and receiving Msg4.

[0069] Step 3: The terminal sends an uplink transmission (schedule transmission) to the network, sending Msg3.

[0070] The terminal transmits Msg3 on the scheduled resources, mainly used to notify the network what event triggers the RACH (Random Access Channel) process. For example, if it is an initial access random process, the UE ID (User Equipment Identifier) and establishment cause (RRC reconstruction cause) will be carried in Msg3; if it is an RRC reconstruction, the connected state UE identifier and establishment cause will be carried.

[0071] Step 4: The network sends Msg4 to the terminal, that is, contention resolution.

[0072] Msg4 has two main functions. One is for contention conflict resolution, and the second is for the network to transmit RRC configuration messages to the terminal. Among them, there are the following two ways of contention conflict resolution: One is that if the UE carries a C-RNTI (Cell Radio Network Temporary Identifier) in Msg3, then Msg4 is scheduled by a PDCCH scrambled with the C-RNTI. The other is that if the UE does not carry a C-RNTI in Msg3, such as in the case of initial access, then Msg4 is scheduled by a PDCCH scrambled with the TC-RNTI. The conflict is resolved by the UE receiving the PDSCH of Msg4 and matching the CCCH (Common Control Channel) SDU (Service Data Unit) in the PDSCH.

[0073] From the above random access process, it can be seen that the main purpose of random access is for the terminal to achieve uplink synchronization with the cell. During the random access process, the network can know the time when the terminal sends the preamble based on the RACH time-frequency resources used to receive the preamble from the terminal, and thus determine the initial TA (Timing Advance) of the terminal according to the sending time and receiving time of the preamble, and inform the terminal through the RAR.

[0074] (2) Random access process in NR Rel-16 version

[0075] As Figure 2 shown, it is a schematic diagram of a random access process in the prior art. Two-step random access is currently in the Rel-16 standardization discussion process. Its introduction can reduce latency and at the same time reduce signaling overhead. MsgA in two-step random access contains the Preamble transmitted on the PRACH and the payload information transmitted on the PUSCH (Physical Uplink Shared Channel). After the transmission of MsgA, the terminal listens for the response from the network side within the configured window. If it receives an indication of successful contention conflict resolution sent by the network, the terminal ends the random access process.

[0076] It should be noted that based on the basic assumptions of the current Rel-17 NTN standardization, UEs in NTN all have positioning capabilities and support two types of UEs. One is a UE without TA compensation capabilities, and the other is a UE with TA compensation capabilities. For these two types of UEs, the methods for determining the initial TA are different.

[0077] (1) For four-step random access, for a UE without initial TA compensation capability, the UL timing is aligned with the DL timing when the UE sends a preamble. The network uses a relatively long preamble reception window to receive the preamble from the UE, and then indicates the TA value to the UE in the RAR.

[0078] For a terminal with initial TA compensation capability, its random access process is as Figure 3 shown.

[0079] Step 1: The UE estimates its own TA based on its positioning capability and sends msg1 using the TA it estimates.

[0080] Step 2: After receiving msg1, the network determines the TA adjustment value of the UE and indicates it to the UE through msg2. Since the network does not know the exact TA value of the UE at this time, the network can schedule the resources of the UE's msg3 according to the maximum uplink scheduling delay.

[0081] Step 3: The UE adjusts the TA based on the indication in the received RAR and sends msg3 on the uplink resources scheduled by the network.

[0082] Step 4: After receiving the UE's msg3, the network can know the initial TA used by the UE, and since then, the network side and the UE side have the same understanding of the TA value of the UE.

[0083] (2) For two-step random access, for a UE without initial TA compensation capability, the UL timing is aligned with the DL timing when the UE sends MsgA. The network uses a relatively long preamble reception window to receive the preamble from the UE, and then indicates the TA value to the UE in MsgB.

[0084] For a terminal with initial TA compensation capability, its random access process is as Figure 4 shown.

[0085] Step 1: The UE estimates its own TA based on its positioning capability and sends msgA using the TA it estimates. The UE also carries the TA value it uses in MsgA.

[0086] Step 2: After receiving msgA, the network determines the TA adjustment value of the UE and indicates it to the UE through msgB.

[0087] As can be seen from the above, for the two types of terminals with and without TA compensation capabilities, their random access processes are different. The network needs to maintain different preamble reception windows, send different formats of RARs, and adopt different Msg3 scheduling strategies for these two types of terminals. All these will increase the complexity of network implementation and pose higher requirements for network implementation.

[0088] As Figure 5 shown, it is a system architecture diagram of the wireless communication system applied in the embodiment of the present invention. It includes a network device and a terminal device. Among them, the network device can further include an access network device and a core network device. That is, the wireless communication system further includes a plurality of core networks for communicating with the access network device.

[0089] The access network device can be an evolved Node B (abbreviated as eNB or e-NodeB) macro base station, micro base station (also called "small base station"), pico base station, access point (AP), transmission point (TP) or new generation Node B (gNodeB) in a Long-Term Evolution (LTE) system, Next Radio (NR) system or Licensed-Assisted Access Long-Term Evolution (LAA-LTE) system, etc.

[0090] The terminal device can be called a user equipment (UE), mobile station (MS), mobile terminal, intelligent terminal, etc. The terminal device can communicate with one or more core networks via a radio access network (RAN). For example, the terminal device can be a mobile phone (or called "cellular" phone), a computer with a mobile terminal, etc. The terminal device can also be a portable, pocket-sized, handheld, computer-integrated or vehicle-mounted mobile device and a terminal device in a future NR network, which exchange voice or data with the radio access network. Explanation of the terminal device: In this application, the terminal device can further include a Relay, and anything that can communicate with the base station can be regarded as a terminal device. In this application, the general sense of UE will be used for introduction.

[0091] In an embodiment of the present invention, the indication information (activation / deactivation indication information of the initial TA compensation) sent by the network device to the terminal device can be for a four-step random access process, or for a two-step random access process. Alternatively, the network device can also send only one activation / deactivation indication information of the initial TA compensation, which acts on both the four-step random access process and the two-step random access process at the same time.

[0092] The technical solution of the present invention will be further described below by way of embodiments.

[0093] I. For the four-step random access process, as Figure 6 shown, it is a schematic diagram of an embodiment of a random access method in an embodiment of the present invention, including:

[0094] 601. The network device sends indication information to the terminal device.

[0095] The terminal device receives the indication information sent by the network device; the indication information is used to indicate whether the terminal device performs timing advance (TA) compensation. Among them, the indication information can include: indication information for activating TA compensation, or indication information for deactivating TA compensation.

[0096] It can be understood that if the implementation of the network device is relatively simple and only one preamble reception window is maintained, then the network device can send indication information for deactivating TA compensation to the terminal device; if the implementation of the network device is relatively complex and multiple preamble reception windows can be maintained, then the network device can send indication information for activating TA compensation to the terminal device.

[0097] Optionally, if the indication message includes a preset identifier, the indication message is indication information for activating TA compensation; if the indication message does not include a preset identifier, the indication message is indication information for deactivating TA compensation. It can be understood that the preset identifier can be other identifiers such as letters, numbers, or a combination of letters, numbers, and other identifiers, and specific details are not limited here.

[0098] Optionally, the indication message can include a 1-bit indication field; when the 1-bit indication field is 1, the indication message is indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is indication information for deactivating TA compensation. It should be noted that the indication message can also include an N-bit indication field, where N is an integer greater than or equal to 1. When each bit indication field is 1, the indication message is indication information for activating TA compensation; when each bit indication field is 0, the indication message is indication information for non-activating TA compensation.

[0099] Optionally, in some embodiments of the present invention, when the network device sends indication information to the terminal device, it may include: the network device sends the indication information to the terminal device by means of broadcasting, unicasting or multicasting.

[0100] 602. The terminal device determines the TA compensation result according to the indication information.

[0101] The terminal device determines the TA compensation result according to the indication information, which may include: when the indication information is the indication information for deactivating TA compensation, the terminal device determines not to perform TA compensation; when the indication information is the indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation capability of the terminal device.

[0102] Optionally, when the indication information is the indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation capability of the terminal device, which may include: when the terminal device has the compensation capability, the terminal device performs TA compensation; when the terminal device does not have the compensation capability, the terminal device does not perform TA compensation.

[0103] Further, when the terminal device performs TA compensation, it may include: the terminal device determines the estimated TA result according to the position of the terminal device and the position of the satellite (for the network architecture in the transparent transmission mode, the position information of the ground base station may also be required at the same time).

[0104] 603. The terminal device sends a random access request to the network device through the TA compensation result.

[0105] The network device receives the random access request sent by the terminal device through the TA compensation result, and the TA compensation result is determined by the terminal device according to the indication information.

[0106] Among them, when the terminal device sends a random access request to the network device through the TA compensation result, it may include: when the terminal device has the compensation capability, the terminal device sends a random access request according to the estimated TA result; when the terminal device does not have the compensation capability, the terminal device uses the uplink timing aligned with the downlink timing to send a random access request.

[0107] It can be understood that the type of random access in the embodiments of the present invention includes the 4step-rach type.

[0108] When the indication information includes the indication information for activating TA compensation, the network device receiving the random access request sent by the terminal device may include: the network device uses a first reception window to receive the random access request sent by the terminal device using the estimated TA result. The estimated TA result is calculated by the terminal device based on the position of the terminal device and the position of the satellite when the terminal device has the compensation ability. At this time, the first reception window used by the network is a random access request reception window with a shorter length to receive the random access request sent by the terminal device.

[0109] When the indication information includes the indication information for deactivating TA compensation, the network device receiving the random access request sent by the terminal device may include: the network device uses a second reception window to receive the random access request sent by the terminal device according to the indication information for deactivating TA compensation and using the uplink timing aligned with the downlink timing. At this time, the second reception window used by the network is a random access request reception window with a longer length to receive the random access request sent by the terminal device.

[0110] Optionally, the window length of the first reception window is less than the window length of the second reception window.

[0111] Exemplarily, in the random access process, a UE with TA compensation ability can decide whether to send a random access request using its own estimated TA according to the indication of the network device. The UE receives the activation / deactivation indication of the initial TA compensation for the four-step random access from the network device. Among them, the indication information is a cell common configuration and can be carried in the system message, for example, using SIB (System Information Block) x (x is greater than or equal to 1); the specific indication method is as follows:

[0112] Exemplarily, whether the activation / deactivation of the initial TA compensation is indicated by a 1-bit indication field. The appearance of the 1-bit indication field indicates that the UE is allowed to perform the initial TA compensation by itself, and the non-appearance of the 1-bit indication field indicates that the UE is not allowed to perform the initial TA compensation by itself. Further, the information indicated by the 1-bit indication field is used for the activation / deactivation indication of the initial TA compensation. The 1-bit indication field always exists, 1 indicates that the UE is allowed to perform the initial TA compensation by itself, and 0 indicates that the UE is not allowed to perform the initial TA compensation by itself.

[0113] Exemplarily, in the random access process, the UE is based on the activation / deactivation indication of the network's initial TA compensation: if the network indicates deactivating the initial TA compensation, the UE does not perform TA compensation when sending a random access request, that is, the UE uses the UL timing aligned with the DL timing to send the random access request.

[0114] If the network indicates to activate the initial TA compensation, the UE determines whether it has the TA compensation capability: 1) If the UE does not have the TA compensation capability, the UE does not perform TA compensation when sending a random access request, that is, the UE uses the UL timing aligned with the DL timing to send msg1; 2) If the UE has the TA compensation capability, the UE performs TA compensation when sending msg1, that is, the UE uses the TA estimated by itself to send a random access request.

[0115] It can be understood that the random access request includes Msg1, and Msg1 includes a preamble transmitted on the physical random access channel PRACH; the terminal device sends the selected preamble on the selected PRACH resource. It should be noted that in contention-based random access, the PRACH resource and the preamble are selected by the terminal according to the triggered random access event. If it is non-contention-based random access, the PRACH resource and the preamble can be informed by the network device to the terminal device.

[0116] 604. The network device sends a random access response to the terminal device according to the random access request.

[0117] The terminal device receives the random access response sent by the network device according to the random access request. The content included in the random access response can refer to Figure 1A Step 2 shown, which will not be elaborated here.

[0118] It should be noted that for non-contention-based random access, after the terminal device successfully receives the random access response, the random access process ends. However, for contention-based random access, after the terminal device successfully receives the random access response, steps 605 and 606 will also be performed.

[0119] 605. The terminal device sends the event that triggers the random access to the network device.

[0120] Among them, it should be noted that the events triggering random access requests may include but are not limited to the following events: (1) Establishing a radio connection during the initial access of a user equipment (UE): The UE transitions from the RRC_IDLE (Radio Resource Control idle) state to the RRC_CONNECTED (Radio Resource Control connected) state; (2) RRC connection reestablishment process: To enable the UE to reestablish a radio connection after a radio link failure; (3) Handover: The UE needs to establish uplink synchronization with a new cell; (4) When DL (Downlink) data arrives in the RRC_CONNECTED state and the UL (Uplink) is out of synchronization at this time; (5) When UL data arrives in the RRC_CONNECTED state and the UL is out of synchronization or there is no PUCCH resource for sending SR (Scheduling Request) at this time; (6) SR failure; (7) Synchronization reconfiguration request from RRC; (8) The UE transitions from the RRC_INACTIVE (Radio Resource Control active) state to the RRC_CONNECTED state; (9) Establishing time calibration during the SCell (Secondary cell) addition process; (10) Requesting other SI (System Information); (11) Beam failure recovery.

[0121] 606. The network device sends contention conflict resolution information to the terminal device.

[0122] It should be noted that steps 605 and 606 can refer to Figure 1A Steps 3 and 4 shown, which will not be elaborated here.

[0123] In an embodiment of the present invention, the terminal device receives indication information sent by the network device, where the indication information is used to indicate whether the terminal device performs Timing Advance (TA) compensation; according to the indication information, the terminal device determines the TA compensation result and sends a random access request to the network device based on the TA compensation result. Using this method, the network device can control the random access behavior of the terminal according to its own implementation, making the behavior of the terminal device conform to the actual situation on the network side.

[0124] II. For the two-step random access process, as Figure 7 shown, it is a schematic diagram of another embodiment of a random access method in an embodiment of the present invention, including:

[0125] 701. The network device sends indication information to the terminal device.

[0126] 702. The terminal device determines the TA compensation result according to the indication information.

[0127] In the embodiments of the present invention, steps 701 and 702 can refer to Figure 6 the descriptions of steps 601 and 602 in the illustrated embodiments, which will not be elaborated here.

[0128] 703. The terminal device sends a random access request to the network device based on the TA compensation result.

[0129] It can be understood that in the embodiments of the present invention, the type of random access includes the 2step-rach type. The random access request may include MsgA; and MsgA includes a preamble transmitted on the PRACH and payload information transmitted on the physical uplink shared channel PUSCH.

[0130] 704. The network device sends a random access response and contention conflict resolution information to the terminal device according to the random access request.

[0131] In the embodiments of the present invention, steps 703 and 704 can refer to Figure 6 the descriptions of steps 603 and 604 in the illustrated embodiments, which will not be elaborated here.

[0132] In the embodiments of the present invention, the terminal device receives the indication information sent by the network device, and the indication information is used to indicate whether the terminal device performs timing advance (TA) compensation; according to the indication information, the terminal device determines the TA compensation result and sends a random access request to the network device based on the TA compensation result. Using this method, the network device can control the random access behavior of the terminal according to its own implementation, so that the behavior of the terminal device conforms to the actual situation on the network side.

[0133] Next, the device embodiments in the embodiments of the present invention will be described. As Figure 8 shown, it is a schematic diagram of an embodiment of a terminal device in the embodiments of the present invention, which may include:

[0134] A receiving module 801, configured to receive the indication information sent by the network device, where the indication information is used to indicate whether the terminal device performs timing advance (TA) compensation;

[0135] A processing module 802, configured to determine the TA compensation result for the terminal device according to the indication information;

[0136] A sending module 803, configured to send a random access request to the network device based on the TA compensation result.

[0137] Optionally, in some embodiments of the present invention, the indication information includes indication information for activating TA compensation, or indication information for deactivating TA compensation.

[0138] Optionally, in some embodiments of the present invention,

[0139] The processing module 802 is specifically configured to determine not to perform TA compensation when the indication information is the indication information for deactivating TA compensation.

[0140] Optionally, in some embodiments of the present invention,

[0141] The processing module 802 is specifically configured to determine the TA compensation result according to the compensation capability of the terminal device when the indication information is the indication information for activating TA compensation.

[0142] Optionally, in some embodiments of the present invention,

[0143] The processing module 802 is specifically configured to perform TA compensation on the terminal device when the terminal device has the compensation capability;

[0144] The processing module 802 is specifically configured to not perform TA compensation on the terminal device when the terminal device does not have the compensation capability.

[0145] Optionally, in some embodiments of the present invention,

[0146] The processing module 802 is specifically configured to determine the estimated TA result according to the position of the terminal device and the position of the satellite.

[0147] Optionally, in some embodiments of the present invention,

[0148] The sending module 801 is specifically configured to send a random access request according to the estimated TA result when the terminal device has the compensation capability;

[0149] The sending module 801 is specifically configured to send a random access request using the uplink timing aligned with the downlink timing when the terminal device does not have the compensation capability.

[0150] Optionally, in some embodiments of the present invention,

[0151] If the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

[0152] Optionally, in some embodiments of the present invention, the indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

[0153] Optionally, in some embodiments of the present invention,

[0154] The receiving module 801 is specifically configured to receive the indication information sent by the network device by means of broadcast, unicast or multicast.

[0155] Optionally, in some embodiments of the present invention,

[0156] The receiving module 801 is further configured to receive the random access response sent by the network device according to the random access request.

[0157] Optionally, in some embodiments of the present invention, the types of random access include 4step-rach type and 2step-rach type.

[0158] As Figure 9 shown, it is a schematic diagram of an embodiment of the network device in the embodiment of the present invention, which may include:

[0159] The sending module 901 is configured to send indication information to the terminal device, and the indication information is used to indicate whether the terminal device performs timing advance (TA) compensation;

[0160] The receiving module 902 is configured to receive the random access request sent by the terminal device through the TA compensation result, and the TA compensation result is determined by the terminal device according to the indication information.

[0161] Optionally, in some embodiments of the present invention, the indication information includes the indication information for activating TA compensation, or the indication information for deactivating TA compensation.

[0162] Optionally, in some embodiments of the present invention, if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

[0163] Optionally, in some embodiments of the present invention, the indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

[0164] Optionally, in some embodiments of the present invention, when the indication information includes the indication information for activating TA compensation,

[0165] The receiving module 902 is specifically configured to use the first receiving window to receive the random access request sent by the terminal device to the network device using the estimated TA result, and the estimated TA result is calculated by the terminal device according to the position of the terminal device and the position of the satellite when the terminal device has the compensation ability.

[0166] Optionally, in some embodiments of the present invention, when the indication information includes indication information for deactivating TA compensation,

[0167] The receiving module 902 is specifically configured to use the second receiving window to receive a random access request sent by the terminal device to the network device according to the indication information for deactivating TA compensation, using an uplink timing aligned with the downlink timing.

[0168] Optionally, in some embodiments of the present invention, the window length of the first receiving window is less than the window length of the second receiving window.

[0169] Optionally, in some embodiments of the present invention,

[0170] The sending module 901 is specifically configured to send indication information to the terminal device by means of broadcast, unicast, or multicast.

[0171] Optionally, in some embodiments of the present invention,

[0172] The sending module 901 is further configured to send a random access response to the terminal device according to the random access request.

[0173] Optionally, in some embodiments of the present invention, the types of random access include 4step-rach type and 2step-rach type.

[0174] As Figure 10 shown, it is a schematic diagram of another embodiment of the network device in the embodiments of the present invention, which may include:

[0175] A transmitter 1001 and a receiver 1002, the transmitter 1001 and the receiver 1002 are connected by a bus;

[0176] The transmitter 1001 is configured to send indication information to the terminal device, and the indication information is used to indicate whether the terminal device performs timing advance TA compensation;

[0177] The receiver 1002 is configured to receive a random access request sent by the terminal device through the TA compensation result, and the TA compensation result is determined by the terminal device according to the indication information.

[0178] Optionally, in some embodiments of the present invention, the indication information includes indication information for activating TA compensation or indication information for deactivating TA compensation.

[0179] Optionally, in some embodiments of the present invention, if the indication message includes a preset identifier, the indication message is indication information for activating TA compensation; if the indication message does not include a preset identifier, the indication message is indication information for deactivating TA compensation.

[0180] Optionally, in some embodiments of the present invention, the indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

[0181] Optionally, in some embodiments of the present invention, when the indication information includes the indication information for activating TA compensation,

[0182] The receiver 1002 is specifically configured to use the first reception window to receive the random access request sent by the terminal device to the network device using the estimated TA result, where the estimated TA result is calculated by the terminal device based on the position of the terminal device and the position of the satellite when the terminal device has the compensation capability.

[0183] Optionally, in some embodiments of the present invention, when the indication information includes the indication information for deactivating TA compensation,

[0184] The receiver 1002 is specifically configured to use the second reception window to receive the random access request sent by the terminal device to the network device using the uplink timing aligned with the downlink timing according to the indication information for deactivating TA compensation.

[0185] Optionally, in some embodiments of the present invention, the window length of the first reception window is less than the window length of the second reception window.

[0186] Optionally, in some embodiments of the present invention,

[0187] The transmitter 1001 is specifically configured to send the indication information to the terminal device by means of broadcast, unicast or multicast.

[0188] Optionally, in some embodiments of the present invention,

[0189] The transmitter 1001 is further configured to send a random access response to the terminal device according to the random access request.

[0190] Optionally, in some embodiments of the present invention, the types of random access include 4-step-rach type and 2-step-rach type.

[0191] Such as Figure 11As shown in the figure, it is a schematic diagram of another embodiment of the terminal device in the embodiment of the present invention. Taking a mobile phone as an example, it may include: a radio frequency (RF) circuit 1110, a memory 1120, an input unit 1130, a display unit 1140, a sensor 1150, an audio circuit 1160, a wireless fidelity (WiFi) module 1170, a processor 1180, and a power supply 1190, etc. Among them, the RF circuit 1110 includes a receiver 1111 and a transmitter 1112. Those skilled in the art can understand that Figure 11 the mobile phone structure shown in the figure does not constitute a limitation on the mobile phone, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0192] Next, Figure 11 a specific introduction to each component of the mobile phone will be given:

[0193] The RF circuit 1110 can be used for receiving and sending signals during information reception or call processes. Specifically, after receiving the downlink information from the base station, it is given to the processor 1180 for processing; in addition, the designed uplink data is sent to the base station. Usually, the RF circuit 1110 includes, but is not limited to, antennas, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc. In addition, the RF circuit 1110 can also communicate with the network and other devices through wireless communication. The above wireless communication can use any communication standard or protocol, including but not limited to the global system of mobile communication (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), long term evolution (LTE), email, short messaging service (SMS), etc.

[0194] The memory 1120 can be used to store software programs and modules. The processor 1180 executes various functional applications and data processing of the mobile phone by running the software programs and modules stored in the memory 1120. The memory 1120 may mainly include a program storage area and a data storage area. Among them, the program storage area can store the operating system, application programs required for at least one function (such as the sound playback function, the image playback function, etc.); the data storage area can store the data created according to the use of the mobile phone (such as audio data, phone book, etc.). In addition, the memory 1120 may include high-speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0195] The input unit 1130 can be used to receive input digital or character information and generate key signal inputs related to the user settings and function controls of the mobile phone. Specifically, the input unit 1130 may include a touch panel 1131 and other input devices 1132. The touch panel 1131, also known as a touch screen, can collect the touch operations of the user on or near it (such as the operations of the user using a finger, a stylus, or any suitable object or accessory on or near the touch panel 1131), and drive the corresponding connection device according to a preset program. Optionally, the touch panel 1131 may include two parts: a touch detection device and a touch controller. Among them, the touch detection device detects the touch position of the user and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the processor 1180, and can receive and execute the commands sent by the processor 1180. In addition, the touch panel 1131 can be implemented in multiple types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1131, the input unit 1130 may further include other input devices 1132. Specifically, the other input devices 1132 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.), a trackball, a mouse, a joystick, etc.

[0196] The display unit 1140 can be used to display information input by the user or information provided to the user, as well as various menus of the mobile phone. The display unit 1140 may include a display panel 1141. Optionally, the display panel 1141 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc. Further, the touch panel 1131 can cover the display panel 1141. When the touch panel 1131 detects a touch operation on or near it, it is transmitted to the processor 1180 to determine the type of touch event. Subsequently, the processor 1180 provides a corresponding visual output on the display panel 1141 according to the type of touch event. Although in Figure 11 , the touch panel 1131 and the display panel 1141 are implemented as two independent components to realize the input and input functions of the mobile phone, but in some embodiments, the touch panel 1131 and the display panel 1141 can be integrated to realize the input and output functions of the mobile phone.

[0197] The mobile phone may further include at least one sensor 1150, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. Among them, the ambient light sensor can adjust the brightness of the display panel 1141 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1141 and / or the backlight when the mobile phone is moved to the ear. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes). When stationary, it can detect the magnitude and direction of gravity, and can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor that the mobile phone can also be configured with, they will not be elaborated here.

[0198] The audio circuit 1160, the speaker 1161, and the microphone 1162 can provide an audio interface between the user and the mobile phone. The audio circuit 1160 can transmit the electrical signal converted from the received audio data to the speaker 1161, and the speaker 1161 converts it into a sound signal for output; on the other hand, the microphone 1162 converts the collected sound signal into an electrical signal, which is received by the audio circuit 1160 and then converted into audio data. After the audio data is output to the processor 1180 for processing, it is sent to another mobile phone, for example, via the RF circuit 1110, or the audio data is output to the memory 1120 for further processing.

[0199] WiFi belongs to short - range wireless transmission technology. Through the WiFi module 1170, a mobile phone can help users send and receive emails, browse the web, and access streaming media, etc. It provides users with wireless broadband Internet access. Although Figure 11 the WiFi module 1170 is shown, it can be understood that it does not belong to the essential components of the mobile phone and can be omitted entirely within the scope of not changing the essence of the invention according to needs.

[0200] The processor 1180 is the control center of the mobile phone. It connects various parts of the entire mobile phone using various interfaces and circuits. By running or executing software programs and / or modules stored in the memory 1120, and by calling data stored in the memory 1120, it executes various functions of the mobile phone and processes data, thereby monitoring the mobile phone as a whole. Optionally, the processor 1180 may include one or more processing units; preferably, the processor 1180 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above - mentioned modem processor may not be integrated into the processor 1180 either.

[0201] The mobile phone also includes a power supply 1190 (such as a battery) that powers each component. Preferably, the power supply can be logically connected to the processor 1180 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. Although not shown, the mobile phone may also include a camera, a Bluetooth module, etc., which will not be elaborated here.

[0202] In an embodiment of the present invention, a receiver 1111 is configured to receive indication information sent by a network device, and the indication information is used to indicate whether a terminal device performs Timing Advance (TA) compensation;

[0203] A processor 1180 is configured to determine a TA compensation result for the terminal device according to the indication information;

[0204] A transmitter 1112 is configured to send a random access request to the network device according to the TA compensation result.

[0205] Optionally, in some embodiments of the present invention, the indication information includes indication information for activating TA compensation, or indication information for de - activating TA compensation.

[0206] Optionally, in some embodiments of the present invention, the processor 1180 is specifically configured to determine not to perform TA compensation when the indication information is indication information for de - activating TA compensation.

[0207] Optionally, in some embodiments of the present invention, the processor 1180 is specifically configured to determine a TA compensation result according to the compensation capability of the terminal device when the indication information is the indication information for activating TA compensation.

[0208] Optionally, in some embodiments of the present invention,

[0209] the processor 1180 is specifically configured to, when the terminal device has compensation capability, perform TA compensation on the terminal device;

[0210] the processor 1180 is specifically configured to, when the terminal device does not have compensation capability, not perform TA compensation on the terminal device.

[0211] Optionally, in some embodiments of the present invention, the processor 1180 is specifically configured to determine an estimated TA result according to the position of the terminal device and the satellite position.

[0212] Optionally, in some embodiments of the present invention,

[0213] the transmitter 1112 is specifically configured to, when the terminal device has compensation capability, the terminal device sends a random access request according to the estimated TA result;

[0214] the transmitter 1112 is specifically configured to, when the terminal device does not have compensation capability, the terminal device uses an uplink timing aligned with the downlink timing to send a random access request.

[0215] Optionally, in some embodiments of the present invention, if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

[0216] Optionally, in some embodiments of the present invention, the indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

[0217] Optionally, in some embodiments of the present invention, the transmitter 1112 is specifically configured to receive the indication information sent by the network device through broadcast, unicast or multicast.

[0218] Optionally, in some embodiments of the present invention, the receiver 1111 is further configured to receive a random access response sent by the network device according to the random access request.

[0219] Optionally, in some embodiments of the present invention, the types of random access include 4-step-rach type and 2-step-rach type.

[0220] 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 processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

[0221] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order different from that shown or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

Claims

1. A random access method, characterized in that, including: The terminal device receives indication information sent by the network device, where the indication information is used to indicate whether the terminal device performs Timing Advance (TA) compensation; According to the indication information, the terminal device determines the TA compensation result and sends a random access request to the network device based on the TA compensation result. The indication information includes indication information for activating TA compensation or indication information for deactivating TA compensation; When the indication information is the indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation capability of the terminal device. When the terminal device has the compensation capability, the terminal device performs TA compensation, and the terminal device determines the estimated TA result according to the position of the terminal device and the position of the satellite.

2. The method according to claim 1, wherein The terminal device determines the TA compensation result according to the indication information, including: When the indication information is the indication information for deactivating TA compensation, the terminal device determines not to perform TA compensation.

3. The method according to claim 1, wherein When the indication information is the indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation capability of the terminal device, including: When the terminal device does not have the compensation capability, the terminal device does not perform TA compensation.

4. The method according to claim 3, wherein Sending the random access request to the network device based on the TA compensation result includes: When the terminal device has the compensation capability, the terminal device sends the random access request according to the estimated TA result; When the terminal device does not have the compensation capability, the terminal device uses the uplink timing aligned with the downlink timing to send the random access request.

5. The method according to any one of claims 1-4, characterized in that If the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; If the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

6. The method according to claim 5, characterized in that, The indication message includes a 1-bit indication field; When the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; When the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

7. The method according to claim 1, characterized in that, The terminal device receives the indication information sent by the network device, including: The terminal device receives the indication information sent by the network device through broadcast, unicast or multicast.

8. The method according to claim 1, wherein After sending the random access request to the network device based on the TA compensation result, the method further includes: The terminal device receives a random access response sent by the network device according to the random access request.

9. The method according to claim 8, wherein The types of the random access include 4-step RACH type and 2-step RACH type.

10. A random access method, characterized in that, including: The network device sends indication information to the terminal device, where the indication information is used to indicate whether the terminal device performs Timing Advance (TA) compensation; The network device receives the random access request sent by the terminal device through the TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information, and the indication information includes indication information for activating TA compensation or indication information for deactivating TA compensation. The network device uses a first reception window to receive the random access request sent by the terminal device to the network device using the estimated TA result, and the estimated TA result is calculated by the terminal device based on the position of the terminal device and the satellite position when the terminal device has the compensation ability.

11. The method according to claim 10, wherein if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

12. The method according to claim 11, wherein The indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

13. The method according to claim 12, wherein When the indication information includes indication information for deactivating TA compensation, the network device receiving the random access request sent by the terminal device includes: The network device uses a second reception window to receive the random access request sent by the terminal device to the network device using an uplink timing aligned with the downlink timing according to the indication information for deactivating TA compensation.

14. The method according to claim 13, wherein The window length of the first reception window is less than the window length of the second reception window.

15. The method according to any one of claims 10 - 14, characterized in that The network device sending indication information to the terminal device includes: The network device sends indication information to the terminal device by means of broadcast, unicast or multicast.

16. The method according to any one of claims 10-14, characterized in that, After the network device receives the random access request sent by the terminal device through the TA compensation result, the method further includes: The network device sends a random access response to the terminal device according to the random access request.

17. The method according to claim 16, wherein The types of the random access include 4-step-rach type and 2-step-rach type.

18. A terminal device, characterized in that, including: a receiving module, configured to receive indication information sent by a network device, where the indication information is used to indicate whether the terminal device performs timing advance TA compensation; a processing module, configured to determine a TA compensation result according to the indication information, where the indication information includes indication information for activating TA compensation or indication information for deactivating TA compensation; specifically, in the case where the indication information is indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation ability of the terminal device. When the terminal device has the compensation ability, the terminal device performs TA compensation, and the terminal device determines an estimated TA result according to the position of the terminal device and the satellite position; a sending module, configured to send a random access request to the network device through the TA compensation result.

19. The terminal device according to claim 18, wherein The processing module is specifically configured to determine not to perform TA compensation when the indication information is the indication information for deactivating TA compensation.

20. The terminal device according to claim 19, wherein the processing module is specifically configured to, when the terminal device does not have the compensation capability, the terminal device does not perform TA compensation.

21. The terminal device according to claim 20, wherein the sending module is specifically configured to, when the terminal device has the compensation capability, the terminal device sends the random access request according to the estimated TA result; the sending module is specifically configured to, when the terminal device does not have the compensation capability, the terminal device uses the uplink timing aligned with the downlink timing to send the random access request.

22. The terminal device according to any one of claims 18-21, wherein if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

23. The terminal device according to claim 22, wherein The indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

24. The terminal device according to claim 18, wherein the receiving module is specifically configured to receive the indication information sent by the network device through broadcast, unicast or multicast.

25. The terminal device according to claim 18, wherein the receiving module is further configured to receive the random access response sent by the network device according to the random access request.

26. The terminal device according to claim 25, wherein The type of the random access includes 4step-rach type and 2step-rach type.

27. A network device, characterized in that, including: a sending module, configured to send indication information to the terminal device, where the indication information is used to indicate whether the terminal device performs timing advance TA compensation; a receiving module, configured to receive the random access request sent by the terminal device through the TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information, and the indication information includes the indication information for activating TA compensation or the indication information for deactivating TA compensation, and is specifically configured to use the first receiving window to receive the random access request sent by the terminal device to the network device using the estimated TA result, and the estimated TA result is calculated by the terminal device according to the position of the terminal device and the position of the satellite when the terminal device has the compensation capability.

28. The network device according to claim 27, wherein if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

29. The network device according to claim 28, wherein, The indication message includes a 1-bit indication field; When the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; When the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

30. The network device according to claim 29, characterized in that, When the indication information includes the indication information for deactivating TA compensation, The receiving module is specifically configured to use a second receiving window to receive a random access request sent by the terminal device to the network device according to the indication information for deactivating TA compensation, using an uplink timing aligned with the downlink timing.

31. The network device according to claim 30, wherein The window length of the first receiving window is less than the window length of the second receiving window.

32. The network device according to any one of claims 27-31, wherein The sending module is specifically configured to send indication information to the terminal device by means of broadcast, unicast or multicast.

33. The network device according to any one of claims 27-31, wherein The sending module is further configured to send a random access response to the terminal device according to the random access request.

34. The network device according to claim 33, wherein The types of the random access include 4step-rach type and 2step-rach type.

35. A terminal device, characterized in that, Comprising: A receiver, a processor and a transmitter, the receiver, the processor and the transmitter are connected by a bus; The receiver is configured to receive indication information sent by the network device, the indication information is used to indicate whether the terminal device performs timing advance TA compensation; The processor is configured to determine a TA compensation result for the terminal device according to the indication information, the indication information includes indication information for activating TA compensation, or indication information for deactivating TA compensation; Specifically, in the case where the indication information is the indication information for activating TA compensation, the terminal device determines the TA compensation result according to the compensation capability of the terminal device. In the case where the terminal device has the compensation capability, the terminal device performs TA compensation, and the terminal device determines an estimated TA result according to the position of the terminal device and the position of the satellite; The transmitter is configured to send a random access request to the network device through the TA compensation result.

36. The terminal device according to claim 35, wherein The processor is specifically configured to determine not to perform TA compensation in the case where the indication information is the indication information for deactivating TA compensation.

37. The terminal device according to claim 36, wherein The processor is specifically configured to determine that the terminal device does not perform TA compensation in the case where the terminal device does not have the compensation capability.

38. The terminal device according to claim 37, wherein The transmitter is specifically configured to, in the case where the terminal device has the compensation capability, the terminal device sends the random access request according to the estimated TA result; The transmitter is specifically configured to, in the case where the terminal device does not have the compensation capability, the terminal device sends the random access request using an uplink timing aligned with the downlink timing.

39. The terminal device according to any one of claims 35 - 38, characterized in that if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

40. The terminal device according to claim 39, wherein The indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

41. The terminal device according to claim 35, characterized in that the transmitter is specifically configured to receive the indication information sent by the network device through broadcast, unicast or multicast.

42. The terminal device according to claim 35, characterized in that the receiver is further configured to receive the random access response sent by the network device according to the random access request.

43. The terminal device according to claim 42, characterized in that, The types of the random access include 4step-rach type and 2step-rach type.

44. A network device, characterized in that, including: a receiver and a transmitter, the receiver and the transmitter are connected by a bus; the transmitter is configured to send indication information to the terminal device, and the indication information is used to indicate whether the terminal device performs timing advance TA compensation; the receiver is configured to receive the random access request sent by the terminal device through the TA compensation result, the TA compensation result is determined by the terminal device according to the indication information, the indication information includes the indication information for activating TA compensation, or the indication information for deactivating TA compensation, and is specifically configured to use the first reception window to receive the random access request sent by the terminal device to the network device using the estimated TA result, and the estimated TA result is calculated by the terminal device according to the position of the terminal device and the satellite position when the terminal device has the compensation ability.

45. The network device according to claim 44, characterized in that if the indication message includes a preset identifier, the indication message is the indication information for activating TA compensation; if the indication message does not include the preset identifier, the indication message is the indication information for deactivating TA compensation.

46. The network device according to claim 45, wherein The indication message includes a 1-bit indication field; when the 1-bit indication field is 1, the indication message is the indication information for activating TA compensation; when the 1-bit indication field is 0, the indication message is the indication information for deactivating TA compensation.

47. The network device according to claim 46, wherein When the indication information includes the indication information for deactivating TA compensation, the receiver is specifically configured to use the second reception window to receive the random access request sent by the terminal device to the network device using the uplink timing aligned with the downlink timing according to the indication information for deactivating TA compensation.

48. The network device according to claim 47, characterized in that, The window length of the first reception window is less than the window length of the second reception window.

49. The network device according to any one of claims 44 - 48, characterized in that The transmitter is specifically configured to send indication information to the terminal device by means of broadcast, unicast, or multicast.

50. The network device according to any one of claims 44-48, characterized in that The transmitter is further configured to send a random access response to the terminal device according to the random access request.

51. The network device according to claim 50, characterized in that, The types of the random access include 4step-rach type and 2step-rach type.

52. A computer-readable storage medium includes instructions that, when running on a computer, cause the computer to execute the method according to any one of claims 1-9 or 10-17.

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