CN114731708A

CN114731708A - Random access method, network equipment and terminal equipment

Info

Publication number: CN114731708A
Application number: CN202080080132.3A
Authority: CN
Inventors: 付喆
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2022-07-08
Also published as: WO2021168702A1

Abstract

The embodiment of the invention provides a random access method, network equipment and terminal equipment, which are used for controlling the random access behavior of a terminal according to the realization condition of the network equipment so that the behavior of the terminal equipment conforms to the actual condition of a network side. The embodiment of the invention comprises the following steps: the method comprises the steps that terminal equipment receives indication information sent by network equipment, wherein the indication information is used for indicating whether the terminal equipment carries out Timing Advance (TA) compensation or not; and according to the indication information, the terminal equipment determines a TA compensation result and sends a random access request to the network equipment through the TA compensation result.

Description

Random access method, network equipment and terminal equipment

Technical Field

The present invention relates to the field of communications, and in particular, to a random access method, a network device, and a terminal device.

Background

Currently, 3GPP (3rd Generation Partnership Project) is researching NTN (Non Terrestrial Network, Non-Terrestrial communication Network) technology, and the NTN generally provides communication service to Terrestrial users by means of satellite communication. Satellite communications have many unique advantages over terrestrial cellular communications. First, satellite communication is not limited by user regions, for example, general terrestrial communication cannot cover regions where communication equipment cannot be set up, such as the sea, mountains, desert, and the like, or communication coverage is not performed due to sparse population, and for satellite communication, since one satellite can cover a large ground and the satellite can orbit around the earth, theoretically every corner on the earth can be covered by satellite communication. Second, satellite communication has great social value. Satellite communication can cover in remote mountain areas, poor and laggard countries or areas with low cost, so that people in the areas can enjoy advanced voice communication and mobile internet technology, the digital gap of developed areas is favorably reduced, and the development of the areas is promoted. Thirdly, the satellite communication distance is far, and the cost of communication is not obviously increased when the communication distance is increased. And finally, the satellite communication has high stability and is not limited by natural disasters.

In the NTN system, two types of terminals, including a Timing Advance (TA) compensation capability and a non-TA compensation capability, are supported. For the two types of terminals, the Random Access processes are different, and the network needs to maintain different preamble (preamble) receiving windows, send RARs (Random Access responses) with different formats, adopt different scheduling policies, and the like for the two types of terminals, which all increase the complexity of network implementation.

Disclosure of Invention

The embodiment of the application provides a random access method, network equipment and terminal equipment, which are used for controlling the random access behavior of a terminal by the network equipment according to the realization condition of the network equipment, so that the behavior of the terminal equipment conforms to the actual condition of a network side.

A first aspect of an embodiment of the present invention provides a random access method, including: the terminal equipment receives indication information sent by the network equipment, wherein the indication information is used for indicating whether the terminal equipment carries out Timing Advance (TA) compensation or not; and according to the indication information, the terminal equipment determines a TA compensation result and sends a random access request to the network equipment through the TA compensation result.

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.

Optionally, in some embodiments of the present invention, the determining, by the terminal device, a TA compensation result according to the indication information includes: and under the condition that the indication information is the indication information for deactivating the TA compensation, the terminal equipment determines not to perform the TA compensation.

Optionally, in some embodiments of the present invention, the determining, by the terminal device, a TA compensation result according to the indication information includes: and under the condition that the indication information is indication information for activating TA compensation, the terminal equipment determines the TA compensation result according to the compensation capability of the terminal equipment.

Optionally, in some embodiments of the present invention, in a case that the indication information is indication information for activating TA compensation, the determining, by the terminal device, the TA compensation result according to the compensation capability of the terminal device includes: under the condition that the terminal equipment has the compensation capability, the terminal equipment carries out TA compensation; in the case where the terminal device does not have the compensation capability, the terminal device does not perform TA compensation.

Optionally, in some embodiments of the present invention, the performing TA compensation by the terminal device includes: the terminal device determines an estimated TA result based on the position of the terminal device and the satellite position.

Optionally, in some embodiments of the present invention, the sending, to the network device, a random access request through the TA backoff result includes: under the condition that the terminal equipment has the compensation capability, the terminal equipment sends the random access request according to the estimated TA result; in the case where the terminal device does not have the backoff capability, the terminal device transmits the random access request using an uplink timing aligned with a downlink timing.

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 the indication information for deactivating the TA compensation.

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

Optionally, in some embodiments of the present invention, the receiving, by the terminal device, the indication information sent by the network device includes: the terminal device receives the indication information sent by the network device in a broadcasting, unicast or multicast mode.

Optionally, in some embodiments of the present invention, after the sending the random access request to the network device through the TA backoff result, the method further includes: and the terminal equipment receives a random access response sent by the network equipment according to the random access request.

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

A second aspect of the embodiments of the present application provides a random access method, including: the network equipment sends indication information to the terminal equipment, wherein the indication information is used for indicating whether the terminal equipment carries out Timing Advance (TA) compensation or not; the network device receives the random access request sent by the terminal device through a TA compensation result, wherein the TA compensation result is determined by the terminal device according to the indication information.

Optionally, in some embodiments of the present invention, when the indication information includes indication information for activating TA backoff, the receiving, by the network device, the random access request sent by the terminal device includes: and the network equipment receives a random access request sent to the network equipment by the terminal equipment by using an estimated TA result by using the first receiving window, wherein the estimated TA result is obtained by calculating according to the position of the terminal equipment and the satellite position under the condition that the terminal equipment has the compensation capability.

Optionally, in some embodiments of the present invention, when the indication information includes indication information for deactivating TA backoff, the receiving, by the network device, the random access request sent by the terminal device includes: and the network equipment uses a second receiving window to receive the indication information of the terminal equipment according to the TA compensation deactivation, and uses the uplink timing aligned with the downlink timing to send a random access request to the network equipment.

Optionally, in some embodiments of the present invention, a window length of the first receiving window is smaller than a window length of the second receiving window.

Optionally, in some embodiments of the present invention, the sending, by the network device, the indication information to the terminal device includes: the network device sends the indication information to the terminal device in a broadcasting, unicast or multicast mode.

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 backoff result, the method further includes: and the network equipment sends a random access response to the terminal equipment according to the random access request.

A third aspect of the embodiments of the present invention provides a terminal device, which has a function that a network device can control a random access behavior of a terminal according to its own implementation, so that the behavior of the terminal device conforms to an actual situation of a network side. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

A fourth aspect of the embodiments of the present invention provides a network device, where the network device can control a random access behavior of a terminal according to its own implementation, so that the behavior of the terminal device conforms to a function of an actual situation of a network side. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

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

a receiver, a processor and a transmitter, the receiver, the processor and the transmitter being connected by a bus;

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 TA compensation;

the processor is configured to determine a TA compensation result by the terminal device according to the indication information;

the transmitter is configured to send a random access request to the network device according to the TA backoff result.

A sixth aspect of the present invention provides a network device, comprising:

a receiver and a transmitter connected by a bus;

the transmitter is configured to transmit indication information to a terminal device, where the indication information is used to indicate whether the terminal device performs TA compensation;

the receiver is configured to receive the random access request sent by the terminal device through a TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information.

A seventh aspect of the present invention provides a computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method as described in any one of the first aspect and the first alternative implementation of the first aspect of the present invention or in any one of the second aspect and the second alternative implementation of the second aspect of the present invention.

An eighth aspect of the present invention provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method as described in any of the first aspect and the first alternative implementation of the first aspect of the present invention or in any of the second aspect and the second alternative implementation of the second aspect of the present invention.

A ninth aspect of the present invention provides a chip, which is coupled to a memory in the terminal device, so that the chip invokes program instructions stored in the memory when running, so that the terminal device executes the method as described in the first aspect of the present invention and any optional implementation manner of the first aspect.

A tenth aspect of the present invention provides a chip, which is coupled to a memory in the network device, so that the chip calls program instructions stored in the memory when running, so that the network device executes the method as described in any one of the optional implementations of the second aspect and the second aspect of the present invention.

In the technical scheme provided by the embodiment of the application, the terminal equipment receives indication information sent by the network equipment, wherein the indication information is used for indicating whether the terminal equipment carries out TA compensation in the timing advance; and according to the indication information, the terminal equipment determines a TA compensation result and sends a random access request to the network equipment through the TA compensation result. By using the method, the network equipment can control the random access behavior of the terminal according to the realization condition of the network equipment, so that the behavior of the terminal equipment conforms to the actual condition of the network side.

Drawings

Fig. 1A is a schematic flow chart of a contention-based random access method in the prior art;

FIG. 1B is a schematic flow chart of a non-contention based random access method in the prior art;

fig. 2 is a schematic flow chart of random access in the prior art;

fig. 3 is a diagram illustrating a random access procedure with initial TA backoff capability in the prior art;

fig. 4 is another diagram illustrating a random access procedure with initial TA backoff capability in the prior art;

fig. 5 is a system architecture diagram of a wireless communication system to which an embodiment of the present invention is applied;

fig. 6 is a diagram of an embodiment of a method for random access according to an embodiment of the present invention;

fig. 7 is a schematic diagram of another embodiment of a method for random access in an embodiment of the present invention;

fig. 8 is a schematic diagram of an embodiment of a terminal device in the embodiment of the present invention;

FIG. 9 is a diagram of an embodiment of a network device in an embodiment of the invention;

FIG. 10 is a diagram of another embodiment of a network device in an embodiment of the invention;

fig. 11 is a schematic diagram of another embodiment of the terminal device in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Communication satellites are classified into LEO (Low-Earth Orbit) satellites, MEO (Medium-Earth Orbit) satellites, GEO (Geostationary Orbit) satellites, HEO (High elliptic Orbit) satellites, and the like according to the difference in orbital altitude. The main studies at the present stage are LEO and GEO. LEO satellite altitude ranges from 500km to 1500km, with a corresponding orbital period of about 1.5 hours to 2 hours. The signal propagation delay for single-hop communication between terminals is typically less than 20 ms. Maximum satellite visibility time 20 minutes. The signal propagation distance is short, the link loss is less, and the requirement on the transmitting power of the terminal is not high. GEO satellites, with an orbital altitude of 35786km, rotate around the earth for a period of 24 hours. The signal propagation delay for inter-user single-hop communications is typically 250 ms.

In order to ensure the coverage of the satellite and improve the system capacity of the whole satellite communication system, the satellite adopts multiple beams to cover the ground, and one satellite can form dozens of or even hundreds of beams to cover the ground; one satellite beam may cover a ground area tens to hundreds of kilometers in diameter.

Next, a random access procedure of next generation (mobile communication system) (NR) is first described as follows:

(1) random access procedure in NR Rel-15 release

In the NR Rel-15 release, the following two random access schemes, i.e., a contention-based random access scheme and a non-contention-based random access scheme, are mainly supported. Fig. 1A is a schematic flow chart of a contention-based random access method in the prior art; fig. 1B is a schematic flow chart of a non-contention based random access method in the prior art.

It is understood that the contention-based random access procedure shown in fig. 1A may be divided into 4 steps, and the non-contention-based random access procedure shown in fig. 1B may be divided into 2 steps. The detailed steps are as follows:

step 1: the terminal sends Msg (message) 1, i.e. Random Access Preamble, to the network. It can be understood that the terminal selects a PRACH (Physical Random Access Channel) resource and transmits the selected preamble on the selected PRACH resource. The base station can estimate uplink Timing based on preamble. It should be noted that, if the random access is based on non-contention, the PRACH resource and preamble may be specified by the base station.

And 2, step: the network sends Msg2, RAR, to the terminal.

After the terminal sends the Random Access preamble, a Random Access Response Window (Random Access Response Window) is opened, and a Physical Downlink Control Channel (PDCCH) scrambled by an RA-RNTI (Random Access Radio Network Temporary Identifier) is monitored in the Window.

After the terminal successfully receives the PDCCH scrambled by the RA-RNTI, the terminal can obtain a PDSCH (Physical Downlink Shared Channel) scheduled by the PDCCH, where the PDSCH includes an RAR (Random Access Response), and the RAR may include but is not limited to the following information:

(1) a subheader of the RAR includes a BI (Backoff Indicator) for indicating a Backoff time of the retransmission Msg 1; (2) RAPID (Random Access Preamble Identity, Random Access Preamble identifier) in the RAR, configured to respond to the received Preamble index by the network; (3) a TAG (Timing Advance Group) is included in payload of the RAR and is used for adjusting uplink Timing; (4) UL grant (uplink grant): an uplink resource indication for scheduling Msg 3; (5) TC-RNTI (Temporary Cell Radio Network Temporary Identifier): initial access of a PDCCH (Physical Downlink Control Channel) for scrambling Msg 4.

And if the terminal receives the PDCCH scrambled by the RAR-RNTI and the RAR contains the preamble index sent by the terminal, the terminal considers that the random access response is successfully received.

It is to be understood that, for non-contention based random access, after the terminal successfully receives the Msg2, the random access procedure ends. For contention-based random access, after the terminal successfully receives the Msg2, the terminal needs to continue transmitting Msg3 and receiving Msg 4.

And step 3: the terminal sends uplink transmission (schedule transmission) to the network, and sends Msg 3.

The terminal transmits Msg3 on a scheduling resource, which is mainly used to inform the network what event triggered the RACH (Random Access Channel) procedure. For example, if the access procedure is an initial access random procedure, the Msg3 carries a UE ID (user equipment identifier) and an estiblish cause (RRC reestablishment cause); if the RRC is reestablished, the connection state UE identification and the estipalishment cause are carried.

And 4, step 4: the network sends Msg4, i.e. Contention conflict Resolution (Contention Resolution), to the terminal.

The Msg4 has two main functions, one is used for contention conflict resolution and the second is that the network transmits RRC configuration message to the terminal. Among them, there are two ways for contention conflict resolution: one is that if the UE carries a C-RNTI (Cell Radio Network Temporary Identifier) in the Msg3, the Msg4 uses PDCCH scheduling scrambled by the C-RNTI. The other is that if the UE does not carry C-RNTI in Msg3, for example, it is initial access, Msg4 uses PDCCH scheduling scrambled by TC-RNTI, and the conflict is resolved by that the UE receives PDSCH of Msg4 and matches CCCH (Common Control Channel) SDU (Service Data Unit) in PDSCH.

As can be seen from the above random access process, the main purpose of random access is to achieve uplink synchronization between the terminal and the cell. In the random access process, the network can know the time when the terminal sends the preamble according to the RACH time-frequency resource used for receiving the preamble from the terminal, so that the initial TA (Timing Advance) of the terminal is determined according to the sending time and the receiving time of the preamble, and the terminal is informed through the RAR.

(2) Random access procedure in NR Rel-16 release

Fig. 2 is a schematic diagram illustrating a process of random access in the prior art. Two-step random access is currently in the process of the Rel-16 standardization discussion, which introduces the possibility of reducing the latency while reducing the signaling overhead. The MsgA in the two-step random access includes a Preamble transmitted on the PRACH and load information transmitted on a PUSCH (Physical Uplink Shared Channel), after the MsgA is transmitted, the terminal monitors a response of the network side in a configured window, and if an indication that contention conflict resolution is successful is received from the network, the terminal ends the random access process.

It should be noted that, based on the basic assumption of the current Rel-17NTN standardization, the UEs in the NTN all have positioning capability and simultaneously support two types of UEs, one is a UE without TA compensation capability and the other is a UE with TA compensation capability. The determination method of the initial TA is different for the two types of UEs.

(1) For the four-step random access, for the UE without initial TA compensation capability, UL timing and DL timing are aligned when the UE sends the preamble, the network uses a longer preamble receiving window to receive the preamble from the UE, and then the TA value is indicated to the UE through the RAR.

For a terminal with initial TA backoff capability, the random access procedure is shown in fig. 3.

Step 1: the UE estimates its own TA based on the positioning capability and transmits msg1 using the TA that it estimates itself.

Step 2: the network determines the UE's TA adjustment value after receiving msg1 and indicates to the UE through msg 2. Since the network does not know the exact TA value of the UE at this time, the network can schedule the resource of msg3 of the UE according to the maximum uplink scheduling delay at this time.

And step 3: the UE adjusts the TA based on the received indication of the RAR and sends msg3 on the uplink resource scheduled by the network.

And 4, step 4: after receiving msg3 of the UE, the network can know the initial TA used by the UE, and therefore TA values of the UE are understood to be consistent by the network side and the UE side.

(2) For two-step random access, for a UE without initial TA compensation capability, UL timing and DL timing are aligned when the UE sends MsgA, a network receives preamble from the UE by using a longer preamble receiving window, and then TA value is indicated to the UE through MsgB.

For a terminal with initial TA backoff capability, the random access procedure is shown in fig. 4.

Step 1: the UE estimates its TA based on the positioning capability and transmits msgA using the TA estimated by itself. The UE carries the TA value used by the UE in the MsgA.

Step 2: and after receiving the msgA, the network determines a TA adjustment value of the UE and indicates the TA adjustment value to the UE through the msgB.

As can be seen from the above description, for two types of terminals having TA compensation capability and not having TA compensation capability, the random access processes are different, and the network needs to maintain different preamble receiving windows for the two types of terminals, send RARs of different formats, and adopt different Msg3 scheduling policies, which all increase the complexity of network implementation and put forward higher requirements on network implementation.

Fig. 5 is a system architecture diagram of a wireless communication system to which an embodiment of the present invention is applied. The system comprises network equipment and terminal equipment. The network device may further include an access network device and a core network device. I.e. the wireless communication system further comprises a plurality of core networks for communicating with the access network devices.

The access network device may be a long-term evolution (LTE) system, a Next Radio (NR) system, or an evolved base station (evolved Node B) in an authorized assisted access long-term evolution (LAA-LTE) system, which may be an eNB or an e-NodeB) macro base station, a micro base station (also referred to as a "small base station"), a pico base station, an Access Point (AP), a Transmission Point (TP), or a new generation base station (g-NodeB).

A terminal device may be referred to as a User Equipment (UE), a Mobile Station (MS), a mobile terminal (mobile terminal), an intelligent terminal, and the like, and the terminal device may communicate with one or more core networks through a Radio Access Network (RAN). For example, the terminal equipment may be a mobile phone (or so-called "cellular" phone), a computer with a mobile terminal, etc., and the terminal equipment may also be a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device and terminal equipment in future NR networks, which exchange voice or data with a radio access network. Description of terminal device: in this application, the terminal device may further include a Relay, and the terminal device and the base station that can perform data communication may be regarded as the terminal device.

In the embodiment of the present invention, the indication information (activation/deactivation indication information of initial TA backoff) sent by the network device to the terminal device may be for a four-step random access procedure, or for a two-step random access procedure. Alternatively, the network device may send only one activation/deactivation indication message of initial TA backoff, and simultaneously perform the four-step random access procedure and the two-step random access procedure.

The technical solution of the present invention is further illustrated by the following examples.

Fig. 6 is a schematic diagram of an embodiment of a random access method according to an embodiment of the present invention, which is directed to a four-step random access procedure, and includes:

601. and the network equipment sends the indication information to the terminal equipment.

The terminal equipment receives indication information sent by the network equipment; the indication information is used for indicating whether the terminal equipment carries out timing advance TA compensation or not. Wherein, the indication information may include: and activating indication information of TA compensation, or deactivating indication information of TA compensation.

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

Optionally, if the indication message includes the preset identifier, the indication message is indication information for activating TA compensation; and if the indication message does not comprise the preset identification, the indication message is indication information for deactivating TA compensation. It is to be understood that the preset identifier may be other identifiers such as letters, numbers, and the like, or a combination of letters, numbers, other identifiers, and the like, and is not limited herein.

Optionally, the indication message may include a 1-bit indication field; when the 1bit indication domain is 1, the indication message is indication information for activating TA compensation; when the 1bit indication field is 0, the indication message is indication information for deactivating TA compensation. It should be noted that the indication message may also include an Nbit indication field, where N is an integer greater than or equal to 1. When each bit indication domain is 1, the indication message is indication information for activating TA compensation; when each bit indication field is 0, the indication message is the indication information of the inactive TA compensation.

Optionally, in some embodiments of the present invention, sending, by the network device, the indication information to the terminal device may include: the network device sends the indication information to the terminal device in a broadcasting, unicast or multicast mode.

602. And the terminal equipment determines the TA compensation result according to the indication information.

The terminal device determines the TA compensation result according to the indication information, and may include: under the condition that the indication information is indication information for deactivating TA compensation, the terminal equipment determines not to perform TA compensation; and under the condition that the indication information is the indication information for activating the TA compensation, the terminal equipment determines the TA compensation result according to the compensation capability of the terminal equipment.

Optionally, when the indication information is indication information for activating TA compensation, the determining, by the terminal device, a TA compensation result according to the compensation capability of the terminal device may include: under the condition that the terminal equipment has compensation capability, the terminal equipment carries out TA compensation; when the terminal device does not have the compensation capability, the terminal device does not perform TA compensation.

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

603. And the terminal equipment sends a random access request to the network equipment through the TA compensation result.

And the network equipment receives the random access request sent by the terminal equipment through the TA compensation result, wherein the TA compensation result is determined by the terminal equipment according to the indication information.

The sending, by the terminal device, the random access request to the network device through the TA compensation result may include: under the condition that the terminal equipment has compensation capability, the terminal equipment sends a random access request according to an estimated TA result; and under the condition that the terminal equipment does not have the compensation capability, the terminal equipment sends the random access request by using the uplink timing aligned with the downlink timing.

It is understood that the type of random access in the embodiment of the present invention includes a 4step-rach type.

When the indication information includes indication information for activating TA backoff, the receiving, by the network device, the random access request sent by the terminal device may include: the network device receives a random access request sent by the terminal device to the network device by using an estimated TA result through the first receiving window, wherein the estimated TA result is obtained by calculation according to the position of the terminal device and the position of the satellite under the condition that the terminal device has compensation capability. In this case, the first receiving window used by the network is a random access request receiving window having a short length to receive a random access request transmitted from the terminal device.

When the indication information includes indication information for deactivating TA backoff, the receiving, by the network device, the random access request sent by the terminal device may include: and the network equipment receives the random access request sent to the network equipment by the terminal equipment by using the uplink timing aligned with the downlink timing according to the indication information for deactivating the TA compensation by using the second receiving window. At this time, the second receiving window used by the network is a long random access request receiving window to receive the random access request transmitted by the terminal device.

Optionally, the window length of the first receiving window is smaller than the window length of the second receiving window.

For example, in the random access procedure, the UE with TA backoff capability may decide whether to send the random access request with the TA estimated by the UE according to the indication of the network device. The UE receives an activation/deactivation indication of initial TA backoff for four-step random access by the network device. The indication Information is configured to be common to the cell and may be carried in a System message, for example, SIB (System Information Block ) x (x is greater than or equal to 1); the specific indication mode is as follows:

illustratively, whether the 1bit indication field indicates activation/deactivation of indicating initial TA compensation occurs or not, the 1bit indication field indicates that the UE is allowed to perform initial TA compensation, and the 1bit indication field does not indicate that the UE is not allowed to perform initial TA compensation. Further, the information indicated by the 1bit indication field is used for the activation/deactivation indication of the initial TA compensation, the 1bit indication field always exists, 1 indicates that the UE is allowed to perform the initial TA compensation, and 0 indicates that the UE is not allowed to perform the initial TA compensation.

Illustratively, in the random access procedure, the UE activates/deactivates the indication based on the initial TA compensation of the network: if the network indicates to deactivate the initial TA backoff, the UE does not perform TA backoff when sending the random access request, i.e., the UE sends the random access request using UL timing aligned with DL timing.

If the network indicates to activate the initial TA compensation, the UE determines whether the UE has the TA compensation capability: 1) if the UE does not have TA compensation capability, the UE does not perform TA compensation when sending the random access request, namely the UE sends msg1 by using UL timing aligned with DL timing; 2) if the UE has TA compensation capability, the UE performs TA compensation when transmitting msg1, namely the UE transmits a random access request by using the TA estimated by the UE.

It is understood that Msg1 is included in the random access request, Msg1 includes a preamble transmitted on the physical random access channel PRACH; and the terminal equipment sends the selected preamble on the selected PRACH resource. It should be noted that, in the contention-based random access, the PRACH resource and the preamble are selected by the terminal according to the trigger random access event, and if the contention-based random access is non-contention-based, the PRACH resource and the preamble may be notified to the terminal device by the network device.

604. And the network equipment sends a random access response to the terminal equipment according to the random access request.

And the terminal equipment receives a random access response sent by the network equipment according to the random access request. The random access response may refer to step 2 shown in fig. 1A, and is not described herein again.

It should be noted that, based on the non-contention random access, after the terminal device successfully receives the random access response, the random access process is ended. However, for non-contention random access, the terminal device further performs steps 605 and 606 after successfully receiving the random access response.

605. The terminal device sends an event triggering random access to the network device.

It should be noted that the event triggering the random access request may include, but is not limited to, the following events: (1) a radio connection is established when a User Equipment (UE) initially accesses: the UE changes from an RRC _ IDLE (Radio Resource Control, RRC) state to an RRC _ CONNECTED (Radio Resource Control, RRC) state; (2) RRC connection reestablishment process: so that the UE reestablishes the radio connection after the radio link fails; (3) switching: UE needs to establish uplink synchronization with a new cell; (4) in the RRC _ CONNECTED state, DL (Downlink) data arrives, and at this time, UL (Uplink) is in an out-of-step state; (5) in the RRC _ CONNECTED state, UL data arrives, and at this time, UL is in an out-of-sync state or there is no PUCCH resource for transmitting SR (Scheduling Request); (6) SR failure; (7) a synchronous reconfiguration request from the RRC; (8) the UE transitions from an RRC _ INACTIVE (Radio Resource Control, RRC) state to an RRC _ CONNECTED state; (9) establishing time calibration in the SCell (Secondary cell) adding process; (10) request other SI (System Information); (11) and recovering the beam failure.

606. The network device transmits competition conflict resolution information to the terminal device.

It should be noted that step 605 and step 606 may refer to step 3 and step 4 shown in fig. 1A, and are not described herein again.

In the embodiment of the invention, the terminal equipment receives the indication information sent by the network equipment, and the indication information is used for indicating whether the terminal equipment carries out TA compensation or not; and according to the indication information, the terminal equipment determines a TA compensation result and sends a random access request to the network equipment through the TA compensation result. By using the method, the network equipment can control the random access behavior of the terminal according to the realization condition of the network equipment, so that the behavior of the terminal equipment conforms to the actual condition of the network side.

Second, regarding a two-step random access procedure, as shown in fig. 7, which is a schematic diagram of another embodiment of a method for random access in an embodiment of the present invention, the method includes:

701. and the network equipment sends the indication information to the terminal equipment.

702. And the terminal equipment determines the TA compensation result according to the indication information.

Steps 701 and 702 in the embodiment of the present invention may refer to the description of steps 601 and 602 in the embodiment shown in fig. 6, and are not described herein again.

703. And the terminal equipment sends a random access request to the network equipment through the TA compensation result.

It is understood that the type of random access in the embodiment of the present invention includes a 2step-rach type. The random access request may include MsgA; and MsgA includes a preamble transmitted on PRACH and load information transmitted on physical uplink shared channel PUSCH.

704. And the network equipment sends a random access response and competition conflict resolution information to the terminal equipment according to the random access request.

Steps 703 and 704 in the embodiment of the present invention may refer to descriptions of steps 603 and 604 in the embodiment shown in fig. 6, and are not described herein again.

In the embodiment of the invention, the terminal equipment receives the indication information sent by the network equipment, and the indication information is used for indicating whether the terminal equipment carries out Timing Advance (TA) compensation or not; and according to the indication information, the terminal equipment determines a TA compensation result and sends a random access request to the network equipment through the TA compensation result. By using the method, the network equipment can control the random access behavior of the terminal according to the realization condition of the network equipment, so that the behavior of the terminal equipment conforms to the actual condition of the network side.

As shown in fig. 8, the apparatus embodiment in the embodiment of the present invention is a schematic diagram of an embodiment of a terminal device in the embodiment of the present invention, and may include:

a receiving module 801, configured to receive indication information sent by a network device, where the indication information is used to indicate whether a terminal device performs TA compensation;

a processing module 802, configured to determine, according to the indication information, a TA compensation result by the terminal device;

a sending module 803, configured to send the random access request to the network device according to the TA backoff result.

Alternatively, in some embodiments of the present invention,

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

Alternatively, in some embodiments of the present invention,

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

Alternatively, in some embodiments of the present invention,

a processing module 802, specifically configured to perform TA compensation on the terminal device under the condition that the terminal device has the compensation capability;

the processing module 802 is specifically configured to, when the terminal device does not have the compensation capability, not perform TA compensation by the terminal device.

Alternatively, in some embodiments of the present invention,

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

Alternatively, in some embodiments of the present invention,

a sending module 801, configured to send a random access request according to an estimated TA result by a terminal device when the terminal device has a compensation capability;

the sending module 801 is specifically configured to, when the terminal device does not have the compensation capability, send the random access request by using the uplink timing aligned with the downlink timing.

Alternatively, in some embodiments of the present invention,

if the indication message comprises the preset identification, the indication message is indication information for activating TA compensation; and if the indication message does not comprise the preset identification, the indication message is indication information for deactivating TA compensation.

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

Alternatively, in some embodiments of the present invention,

the receiving module 801 is specifically configured to receive, in a broadcast, unicast or multicast manner, indication information sent by a network device.

Alternatively, in some embodiments of the present invention,

the receiving module 801 is further configured to receive a random access response sent by the network device according to the random access request.

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

As shown in fig. 9, which is a schematic diagram of an embodiment of a network device in the embodiment of the present invention, the network device may include:

a sending module 901, configured to send indication information to a terminal device, where the indication information is used to indicate whether the terminal device performs TA compensation;

a receiving module 902, configured to receive a random access request sent by a terminal device according to a TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information.

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

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; and if the indication message does not comprise the preset identification, the indication message is indication information for deactivating TA compensation.

Optionally, in some embodiments of the present invention, when the indication information includes indication information that TA compensation is activated,

the receiving module 902 is specifically configured to receive, by using the first receiving window, a random access request sent by the terminal device to the network device by using an estimated TA result, where the estimated TA result is obtained by performing calculation according to a position of the terminal device and a satellite position when the terminal device has a compensation capability.

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

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

Alternatively, in some embodiments of the present invention,

the sending module 901 is specifically configured to send the indication information to the terminal device in a broadcast, unicast or multicast manner.

Alternatively, in some embodiments of the present invention,

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

As shown in fig. 10, which is a schematic diagram of another embodiment of a network device in an embodiment of the present invention, the network device may include:

a transmitter 1001 and a receiver 1002, the transmitter 1001 and the receiver 1002 being connected by a bus;

a transmitter 1001, configured to send indication information to a terminal device, where the indication information is used to indicate whether the terminal device performs TA compensation;

the receiver 1002 is configured to receive a random access request sent by a terminal device according to a TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information.

the receiver 1002 is specifically configured to receive, using the first receiving window, a random access request sent by the terminal device to the network device using an estimated TA result, where the estimated TA result is obtained by performing calculation according to the position of the terminal device and the satellite position when the terminal device has the compensation capability.

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

Alternatively, in some embodiments of the present invention,

the transmitter 1001 is specifically configured to transmit the indication information to the terminal device in a broadcast, unicast or multicast manner.

Alternatively, in some embodiments of the present invention,

the transmitter 1001 is further configured to transmit a random access response to the terminal device according to the random access request.

As shown in fig. 11, which is a schematic view of another embodiment of the terminal device in the embodiment of the present invention, taking a mobile phone as an example for description, the method may include: radio Frequency (RF) circuitry 1110, memory 1120, input unit 1130, display unit 1140, sensors 1150, audio circuitry 1160, wireless fidelity (WiFi) module 1170, processor 1180, and power supply 1190. The rf circuit 1110 includes a receiver 1111 and a transmitter 1112. Those skilled in the art will appreciate that the handset configuration shown in fig. 11 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The following describes each component of the mobile phone in detail with reference to fig. 11:

RF circuit 1110 may be used for receiving and transmitting signals during a message transmission or a call, and in particular, for receiving downlink information from a base station and processing the received downlink information to processor 1180; in addition, data for designing uplink is transmitted to the base station. In general, RF circuit 1110 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 1110 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to global system for mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Message Service (SMS), etc.

The memory 1120 may be used to store software programs and modules, and the processor 1180 may execute various functional applications and data processing of the mobile phone by operating the software programs and modules stored in the memory 1120. The memory 1120 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, etc. Further, 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, flash memory device, or other volatile solid state storage device.

The input unit 1130 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the cellular phone. Specifically, the input unit 1130 may include a touch panel 1131 and other input devices 1132. Touch panel 1131, also referred to as a touch screen, can collect touch operations of a user on or near the touch panel 1131 (for example, operations of the user on or near touch panel 1131 by using any suitable object or accessory such as a finger or a stylus pen), and drive corresponding connection devices according to a preset program. Alternatively, the touch panel 1131 may include two parts, namely, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 1180, and can receive and execute commands sent by the processor 1180. In addition, the touch panel 1131 can be implemented by using various types, such as resistive, capacitive, infrared, and surface acoustic wave. The input unit 1130 may include other input devices 1132 in addition to the touch panel 1131. In particular, other input devices 1132 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The display unit 1140 may be used to display information input by the user or information provided to the user and various menus of the cellular phone. The display unit 1140 may include a display panel 1141, and optionally, the display panel 1141 may be configured in the form of a Liquid Crystal Display (LCD), an organic light-Emitting diode (OLED), or the like. Further, the touch panel 1131 can cover the display panel 1141, and when the touch panel 1131 detects a touch operation on or near the touch panel, the touch panel is transmitted to the processor 1180 to determine the type of the touch event, and then the processor 1180 provides a corresponding visual output on the display panel 1141 according to the type of the touch event. Although in fig. 11, the touch panel 1131 and the display panel 1141 are two independent components to implement the input and output functions of the mobile phone, in some embodiments, the touch panel 1131 and the display panel 1141 may be integrated to implement the input and output functions of the mobile phone.

The handset may also include at least one sensor 1150, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 1141 according to the brightness of ambient light, and the proximity sensor may turn off the display panel 1141 and/or the backlight when the mobile phone moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.

Audio circuitry 1160, speakers 1161, and microphone 1162 may provide an audio interface between a user and a cell phone. The audio circuit 1160 may transmit the electrical signal converted from the received audio data to the speaker 1161, and convert the electrical signal into a sound signal for output by the speaker 1161; on the other hand, the microphone 1162 converts the collected sound signals into electrical signals, which are received by the audio circuit 1160 and converted into audio data, which are then processed by the audio data output processor 1180, and then transmitted to, for example, another cellular phone via the RF circuit 1110, or output to the memory 1120 for further processing.

WiFi belongs to short-distance wireless transmission technology, and the cell phone can help a user to receive and send e-mails, browse webpages, access streaming media and the like through the WiFi module 1170, and provides wireless broadband internet access for the user. Although fig. 11 shows the WiFi module 1170, it is understood that it does not belong to the essential constitution of the handset, and can be omitted entirely as needed within the scope not changing the essence of the invention.

The processor 1180 is a control center of the mobile phone, and is connected to various parts of the whole mobile phone through various interfaces and lines, and executes various functions of the mobile phone and processes data by operating or executing software programs and/or modules stored in the memory 1120 and calling data stored in the memory 1120, thereby performing overall monitoring of the mobile phone. Optionally, processor 1180 may include one or more processing units; preferably, the processor 1180 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated within processor 1180.

The phone also includes a power supply 1190 (e.g., a battery) for powering the various components, and preferably, the power supply may be logically connected to the processor 1180 via a power management system, so that the power management system may manage charging, discharging, and power consumption management functions. Although not shown, the mobile phone may further include a camera, a bluetooth module, etc., which are not described herein.

In this embodiment of the present invention, the receiver 1111 is configured to receive indication information sent by a network device, where the indication information is used to indicate whether a terminal device performs TA compensation;

a processor 1180, configured to determine, according to the indication information, a TA compensation result by the terminal device;

a transmitter 1112, configured to transmit a random access request to the network device according to the TA backoff result.

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 deactivating TA compensation.

Optionally, in some embodiments of the present invention, the processor 1180 is specifically configured to determine the TA compensation result according to the compensation capability of the terminal device, when the indication information is indication information that the TA compensation is activated.

Alternatively, in some embodiments of the invention,

a processor 1180, configured to perform TA compensation on the terminal device when the terminal device has the compensation capability;

the processor 1180 is specifically configured to not perform TA compensation by the terminal device under the condition that the terminal device does not have the compensation capability.

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

Alternatively, in some embodiments of the present invention,

a transmitter 1112, configured to, in particular, when the terminal device has the compensation capability, send a random access request according to the estimated TA result;

the transmitter 1112 is specifically configured to, when the terminal device does not have the backoff capability, transmit the random access request by using the uplink timing aligned with the downlink timing.

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

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.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, 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, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims

A method of random access, comprising:

the method comprises the steps that terminal equipment receives indication information sent by network equipment, wherein the indication information is used for indicating whether the terminal equipment carries out Timing Advance (TA) compensation or not;

and according to the indication information, the terminal equipment determines a TA compensation result and sends a random access request to the network equipment through the TA compensation result.
The method of claim 1, wherein the indication information comprises indication information of activating TA compensation or indication information of deactivating TA compensation.
The method of claim 2, wherein the determining, by the terminal device, the TA compensation result according to the indication information comprises:

and under the condition that the indication information is indication information for deactivating TA compensation, the terminal equipment determines not to perform TA compensation.
The method of claim 2, wherein the determining, by the terminal device, the TA compensation result according to the indication information comprises:

and under the condition that the indication information is indication information for activating TA compensation, the terminal equipment determines the TA compensation result according to the compensation capability of the terminal equipment.
The method according to claim 4, wherein in a case that the indication information is indication information for activating TA compensation, the determining, by the terminal device, the TA compensation result according to the compensation capability of the terminal device includes:

under the condition that the terminal equipment has the compensation capability, the terminal equipment carries out TA compensation;

and under the condition that the terminal equipment does not have the compensation capability, the terminal equipment does not perform TA compensation.
The method of claim 5, wherein the terminal device performs TA compensation, comprising:

the terminal device determines an estimated TA result based on the position of the terminal device and the satellite position.
The method of claim 6, wherein the sending a random access request to the network device according to the TA backoff result comprises:

under the condition that the terminal equipment has the compensation capability, the terminal equipment sends the random access request according to the estimated TA result;

and under the condition that the terminal equipment does not have the compensation capability, the terminal equipment sends the random access request by using uplink timing aligned with downlink timing.
The method according to any one of claims 2 to 7,

if the indication message comprises a preset identifier, the indication message is the indication information for activating the TA compensation;

and if the indication message does not comprise the preset identifier, the indication message is the indication information for deactivating TA compensation.
The method of claim 8, wherein the indication message comprises a 1-bit indication field;

when the 1bit indication domain is 1, the indication message is the indication information for activating the TA compensation;

and when the 1bit indication domain is 0, the indication message is the indication information for deactivating TA compensation.
The method according to any one of claims 1-9, wherein the terminal device receives indication information sent by a network device, and comprises:

and the terminal equipment receives the indication information sent by the network equipment in a broadcasting, unicast or multicast mode.
The method according to any of claims 1-9, wherein after sending a random access request to the network device via the TA backoff result, the method further comprises:

and the terminal equipment receives a random access response sent by the network equipment according to the random access request.
The method of claim 11, wherein the types of random access comprise a 4step-rach type and a 2step-rach type.
A method of random access, comprising:

the method comprises the steps that network equipment sends indication information to terminal equipment, wherein the indication information is used for indicating whether the terminal equipment carries out Timing Advance (TA) compensation or not;

and the network equipment receives the random access request sent by the terminal equipment through a TA compensation result, wherein the TA compensation result is determined by the terminal equipment according to the indication information.
The method of claim 13, wherein the indication information comprises indication information of activating TA compensation or indication information of deactivating TA compensation.
The method of claim 14,

if the indication message comprises a preset identifier, the indication message is the indication information for activating TA compensation;

and if the indication message does not comprise the preset identifier, the indication message is the indication information for deactivating TA compensation.
The method of claim 15, wherein the indication message comprises a 1-bit indication field;

when the 1bit indication domain is 1, the indication message is the indication information for activating the TA compensation;

and when the 1bit indication domain is 0, the indication message is the indication information for deactivating TA compensation.
The method according to any of claims 14-16, wherein when the indication information includes indication information for activating TA backoff, the network device receiving the random access request sent by the terminal device, comprising:

and the network equipment receives a random access request sent to the network equipment by the terminal equipment by using an estimated TA result by using a first receiving window, wherein the estimated TA result is obtained by calculating according to the position of the terminal equipment and the satellite position under the condition that the terminal equipment has the compensation capability.
The method according to claim 17, wherein when the indication information includes indication information for deactivating TA backoff, the network device receiving the random access request sent by the terminal device, includes:

and the network equipment receives the random access request sent to the network equipment by the terminal equipment according to the indication information for deactivating TA compensation by using a second receiving window and by using uplink timing aligned with downlink timing.
The method of claim 18, wherein a window length of the first receive window is smaller than a window length of the second receive window.
The method according to any of claims 13-19, wherein the network device sends indication information to the terminal device, comprising:

the network device sends the indication information to the terminal device in a broadcasting, unicast or multicast mode.
The method according to any of claims 13-19, wherein after the network device receives the random access request sent by the terminal device through TA backoff result, the method further comprises:

and the network equipment sends a random access response to the terminal equipment according to the random access request.
The method of claim 21, wherein the types of random access comprise a 4step-rach type and a 2step-rach type.
A terminal device, comprising:

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 TA compensation;

the processing module is used for determining a TA compensation result by the terminal equipment according to the indication information;

and the sending module is used for sending a random access request to the network equipment through the TA compensation result.
The terminal device according to claim 23, wherein the indication information comprises indication information of activating TA compensation or indication information of deactivating TA compensation.
The terminal device of claim 24,

the processing module is specifically configured to determine not to perform TA compensation when the indication information is indication information for deactivating TA compensation.
The terminal device of claim 24,

the processing module is specifically configured to determine the TA compensation result according to the compensation capability of the terminal device when the indication information is indication information for activating TA compensation.
The terminal device of claim 26,

the processing module is specifically configured to perform TA compensation by the terminal device when the terminal device has the compensation capability;

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.
The terminal device of claim 27,

the processing module is specifically configured to determine an estimated TA result according to the location of the terminal device and the satellite location.
The terminal device of claim 28,

the sending module is specifically configured to, when the terminal device has the compensation capability, send the random access request according to the estimated TA result by the terminal device;

the sending module is specifically configured to send, by the terminal device, the random access request using uplink timing aligned with downlink timing when the terminal device does not have the compensation capability.
The terminal device according to any of claims 24-29,

if the indication message comprises a preset identifier, the indication message is the indication information for activating the TA compensation;

and if the indication message does not comprise the preset identifier, the indication message is the indication information for deactivating TA compensation.
The terminal device of claim 30, wherein the indication message comprises a 1-bit indication field;

when the 1bit indication domain is 1, the indication message is the indication information for activating the TA compensation;

and when the 1bit indication domain is 0, the indication message is the indication information for deactivating TA compensation.
The terminal device according to any of claims 23-31,

the receiving module is specifically configured to receive, in a broadcast, unicast or multicast manner, indication information sent by a network device.
The terminal device according to any of claims 23-31,

the receiving module is further configured to receive a random access response sent by the network device according to the random access request.
The terminal device of claim 33, wherein the type of random access comprises a 4step-rach type and a 2step-rach type.
A network device, comprising:

a sending module, configured to send indication information to a terminal device, where the indication information is used to indicate whether the terminal device performs TA compensation;

a receiving module, configured to receive the random access request sent by the terminal device through a TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information.
The network device of claim 35, wherein the indication information comprises indication information for activating TA compensation or indication information for deactivating TA compensation.
The network device of claim 36,

if the indication message comprises a preset identifier, the indication message is the indication information for activating TA compensation;

and if the indication message does not comprise the preset identifier, the indication message is the indication information for deactivating TA compensation.
The network device of claim 37, wherein the indication message comprises a 1-bit indication field;

when the 1bit indication domain is 1, the indication message is the indication information for activating the TA compensation;

and when the 1bit indication domain is 0, the indication message is the indication information for deactivating TA compensation.
Network device of any of claims 36-38, wherein when the indication information comprises indication information to activate TA compensation,

the receiving module is specifically configured to receive, by using a first receiving window, a random access request sent by the terminal device to the network device by using an estimated TA result, where the estimated TA result is obtained by performing calculation according to a position of the terminal device and a satellite position when the terminal device has the compensation capability.
The network device of claim 39, wherein when the indication information comprises indication information for deactivating TA compensation,

the receiving module is specifically configured to receive, by using a second receiving window, the indication information for deactivating TA compensation by the terminal device, and use uplink timing aligned with downlink timing to send a random access request to the network device.
The network device of claim 40, wherein a window length of the first receive window is less than a window length of the second receive window.
The network device of any one of claims 35-41,

the sending module is specifically configured to send the indication information to the terminal device in a broadcast, unicast or multicast manner.
The network device of any of claims 35-41,

the sending module is further configured to send a random access response to the terminal device according to the random access request.
The network device of claim 43, wherein the types of random access comprise a 4step-rach type and a 2step-rach type.
A terminal device, comprising:

a receiver, a processor and a transmitter, the receiver, the processor and the transmitter being connected by a bus;

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 TA compensation;

the processor is configured to determine a TA compensation result by the terminal device according to the indication information;

the transmitter is configured to send a random access request to the network device according to the TA backoff result.
A terminal device according to claim 45, wherein the indication information comprises indication information of activating TA compensation or indication information of deactivating TA compensation.
The terminal device of claim 46,

the processor is specifically configured to determine not to perform TA compensation when the indication information is indication information for deactivating TA compensation.
The terminal device of claim 46,

the processor is specifically configured to determine the TA compensation result according to the compensation capability of the terminal device when the indication information is indication information for activating TA compensation.
The terminal device of claim 48,

the processor is specifically configured to perform TA compensation by the terminal device when the terminal device has the compensation capability;

the processor is specifically configured to, when the terminal device does not have the compensation capability, not perform TA compensation by the terminal device.
The terminal device of claim 49,

the processor is specifically configured to determine an estimated TA result based on the location of the terminal device and the satellite location.
The terminal device of claim 50,

the transmitter is specifically configured to, when the terminal device has the compensation capability, send the random access request according to the estimated TA result by the terminal device;

the transmitter is specifically configured to, when the terminal device does not have the compensation capability, the terminal device transmit the random access request using uplink timing aligned with downlink timing.
The terminal device according to any of claims 46-51,

if the indication message comprises a preset identifier, the indication message is the indication information for activating the TA compensation;

and if the indication message does not comprise the preset identifier, the indication message is the indication information for deactivating TA compensation.
The terminal device of claim 52, wherein the indication message comprises a 1-bit indication field;

when the 1bit indication domain is 1, the indication message is the indication information for activating the TA compensation;

and when the 1bit indication domain is 0, the indication message is the indication information for deactivating TA compensation.
The terminal device according to any of claims 45-53,

the transmitter is specifically configured to receive, in a broadcast, unicast, or multicast manner, indication information sent by a network device.
The terminal device according to any of claims 45-53,

the receiver is further configured to receive a random access response sent by the network device according to the random access request.
The terminal device of claim 55, wherein the type of random access comprises a 4step-rach type and a 2step-rach type.
A network device, comprising:

a receiver and a transmitter connected by a bus;

the transmitter is configured to transmit indication information to a terminal device, where the indication information is used to indicate whether the terminal device performs TA compensation;

the receiver is configured to receive the random access request sent by the terminal device through a TA compensation result, where the TA compensation result is determined by the terminal device according to the indication information.
The network device of claim 57, wherein the indication information comprises indication information to activate TA compensation or indication information to deactivate TA compensation.
The network device of claim 58,

if the indication message comprises a preset identifier, the indication message is the indication information for activating the TA compensation;

and if the indication message does not comprise the preset identifier, the indication message is the indication information for deactivating TA compensation.
The network device of claim 59, wherein the indication message comprises a 1-bit indication field;

when the 1bit indication domain is 1, the indication message is the indication information for activating the TA compensation;

and when the 1bit indication domain is 0, the indication message is the indication information for deactivating TA compensation.
The network device of any of claims 58-60, wherein when the indication information comprises an indication information that TA compensation is activated,

the receiver is specifically configured to receive, by using a first receiving window, a random access request sent by the terminal device to the network device using an estimated TA result, where the estimated TA result is obtained by performing calculation according to a position of the terminal device and a satellite position when the terminal device has the compensation capability.
The network device of claim 61, wherein when the indication information comprises indication information for deactivating TA compensation,

the receiver is specifically configured to receive, by using a second receiving window, the indication information for deactivating TA compensation by the terminal device, and use uplink timing aligned with downlink timing to send a random access request to the network device.
The network device of claim 62, wherein a window length of the first receive window is less than a window length of the second receive window.
The network device of any of claims 57-63,

the transmitter is specifically configured to transmit the indication information to the terminal device in a broadcast, unicast, or multicast manner.
The network device of any of claims 57-63,

the transmitter is further configured to transmit a random access response to the terminal device according to the random access request.
The network device of claim 65, wherein the types of random access comprise a 4step-rach type and a 2step-rach type.
A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-12 or 13-22.