CN115804165A

CN115804165A - Method, apparatus, device and medium for updating uplink timing advance

Info

Publication number: CN115804165A
Application number: CN202080102725.5A
Authority: CN
Inventors: 胡奕; 李海涛; 卢前溪; 尤心
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2023-03-14
Also published as: WO2022011710A1

Abstract

The application discloses a method, a device, equipment and a storage medium for updating an uplink Timing Advance (TA), which relate to the field of communication, and the method comprises the following steps: the method comprises the steps that network equipment sends TA adjusting information to a terminal under the condition that feeder line link switching occurs and a service base station is not changed, wherein the TA adjusting information is used for indicating the terminal to update an uplink TA.

Description

Method, apparatus, device and medium for updating uplink timing advance

Technical Field

The present application relates to the field of wireless communications, and in particular, to a method, an apparatus, a device, and a medium for updating a Timing Advance (TA).

Background

An important characteristic of uplink transmission is orthogonal multiple access of different User Equipments (UEs) on time-frequency resources, that is, uplink transmissions of different UEs from the same cell do not interfere with each other.

To ensure orthogonality of uplink transmissions, intra-cell (intra-cell) interference is avoided. The base station requires that the times of arrival at the base station of signals from different UEs at the same time but different frequency domain resources are substantially aligned. In order to ensure time synchronization at the base station side, a New air interface system (New Radio, NR) supports an uplink timing advance mechanism.

However, how to update the uplink TA in a Non-Terrestrial communication Network (NTN) is an urgent problem to be solved.

Disclosure of Invention

The embodiment of the application provides an updating method, device, equipment and storage medium of an uplink TA. The technical scheme is as follows.

According to an aspect of the present application, a method for updating an uplink timing advance TA is provided, which is applied to a network device in an NTN scenario, and the method includes:

and sending TA (timing advance) adjustment information to the terminal under the condition that feeder link switching occurs and a service base station is not changed, wherein the TA adjustment information is used for indicating the terminal to update the uplink TA.

According to an aspect of the present application, a method for updating an uplink TA is provided, which is applied to a terminal in a transparent transmission NTN scenario, and the method includes:

receiving TA adjustment information, wherein the TA adjustment information is sent by a network device under the condition that feeder line link switching occurs and a service base station is not changed;

and updating the uplink TA according to the TA adjusting information.

According to an aspect of the present application, an apparatus for updating an uplink TA is provided, the apparatus including:

a sending module, configured to send TA adjustment information to a terminal under a condition that feeder link switching occurs and a serving base station is not changed, where the TA adjustment information is used to instruct the terminal to update an uplink TA.

a receiving module, configured to receive TA adjustment information, where the TA adjustment information is sent by a network device when a feeder link is switched and a serving base station is not changed;

and the updating module is used for updating the uplink TA according to the TA adjusting information.

According to an aspect of the present application, there is provided a terminal, including: a processor; a transceiver coupled to the processor; a memory for storing executable instructions of the processor; wherein the processor is configured to load and execute the executable instructions to implement the method for updating the uplink TA according to the above aspect.

According to an aspect of the present application, there is provided a network device including: a processor; a transceiver coupled to the processor; a memory for storing executable instructions of the processor; wherein the processor is configured to load and execute the executable instructions to implement the method for updating the uplink TA according to the above aspect.

According to an aspect of the present application, there is provided a computer-readable storage medium, in which executable instructions are stored, and the executable instructions are loaded and executed by the processor to implement the method for updating an uplink TA according to the above aspect.

According to an aspect of the present application, there is provided a computer program product, where an executable instruction is stored in the readable storage medium, and the executable instruction is loaded and executed by the processor to implement the method for updating an uplink TA according to the above aspect.

According to an aspect of the present application, a chip is provided, where the chip is configured to execute to implement the uplink TA updating method according to the above aspect.

The technical scheme provided by the embodiment of the application at least comprises the following beneficial effects:

under the condition that feeder link switching occurs and a service base station is not changed, the network equipment sends TA (timing advance) adjustment information to the terminal by adopting system information or special signaling, and the terminal updates the uplink TA according to the TA adjustment information, so that the problem that the communication between the terminal and the network equipment has to be interrupted due to uplink desynchronization of the terminal is solved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a network architecture diagram of a transparent transport load NTN provided in an exemplary embodiment of the present application;

fig. 2 is a network architecture diagram of a regenerative load NTN provided by an exemplary embodiment of the present application;

fig. 3 is a schematic configuration diagram of a common TA provided in an exemplary embodiment of the present application;

fig. 4 is a schematic switching diagram of feeder links provided in an exemplary embodiment of the present application;

fig. 5 is a flowchart of an updating method of an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 6 is a flowchart of an update method of an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 7 is a time-frequency diagram of an update method of an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 8 is a flowchart of an updating method of an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 9 is a time-frequency diagram of an update method of an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 10 is a flowchart of an updating method of an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 11 is a flowchart of an updating method of an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 12 is a block diagram of an apparatus for updating an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 13 is a block diagram of an apparatus for updating an uplink timing advance TA according to an exemplary embodiment of the present application;

fig. 14 is a schematic structural diagram of a communication device according to an exemplary embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

Currently, the Third Generation Partnership Project (3 GPP) is studying NTN technology, which generally provides communication services 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 communications have great social value. Satellite communication can be covered in remote mountainous areas, poor and laggard countries or areas with lower cost, so that people in the areas can enjoy advanced voice communication and mobile internet technology, the digital gap between the areas is favorably reduced and developed, and the development of the areas is promoted. Thirdly, the satellite communication distance is long, and the communication cost 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.

Communication satellites are classified into Low-Earth Orbit (LEO) satellites, medium-Earth Orbit (MEO) satellites, geosynchronous Orbit (GEO) satellites, high-elliptic Orbit (HEO) satellites, and the like according to the difference in orbital height. The main studies at the present stage are LEO and GEO.

1.LEO

The height range of the low-orbit satellite is 500 km-1500 km, and the corresponding orbit period is about 1.5 hours-2 hours. The signal propagation delay for inter-user single-hop communications is typically less than 20ms. 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 user terminal is not high.

2.GEO

The geosynchronous orbit satellite has the orbit height of 35786km and the rotation period around the earth of 24 hours. The signal propagation delay for inter-user single-hop communications is typically 250ms.

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 several tens to hundreds of kilometers in diameter.

There are at least two NTN scenarios: transparent load NTN and regenerative load NTN. Fig. 1 shows a scenario of transparent transmission load NTN, and fig. 2 shows a scenario of regenerative load NTN.

The NTN network consists of the following network elements:

1 or more gateways for connecting the satellite and the terrestrial public network.

Feeder links: link for communication between gateway and satellite

Service link: link for communication between a terminal and a satellite

Satellite: the functions provided by the device can be divided into two types of transparent load and regenerative load.

The transparent retransmission of the signal is only provided, and the waveform signal retransmitted by the signal is not changed.

Regenerative payload, which may provide demodulation/decoding, routing/conversion, coding/modulation functions in addition to radio frequency filtering, frequency conversion and amplification functions. Which has some or all of the functionality of a base station.

Inter-satellite links (Inter-satellite links, ISL): exist in a regenerative load scenario.

Uplink timing advance

An important characteristic of uplink transmission is that different UEs have orthogonal multiple access in time and frequency, i.e. uplink transmissions from different UEs in the same cell do not interfere with each other.

To ensure orthogonality of uplink transmissions and avoid intra-cell (intra-cell) interference, a base station (gNB) requires that signals from different UEs at the same time but different frequency domain resources arrive at the gNB substantially aligned in time. To guarantee time synchronization on the gbb side, NR supports an uplink timing advance mechanism.

The uplink clock and the downlink clock of the gNB side are the same, while the uplink clock and the downlink clock of the UE side have an offset, and different UEs have different uplink timing advances respectively. The gNB can control the arrival time of uplink signals from different UEs at the gNB by appropriately controlling the offset of each UE. For the UE farther from the gNB, due to the larger transmission delay, the UE closer to the gNB is required to transmit uplink data earlier.

The gNB determines a TA value for each UE based on measuring uplink transmissions of the UE. The gNB sends the TA command to the UE in two ways.

Acquisition of initial TA: in the Random access procedure, the gNB determines a TA value by measuring a received preamble and transmits to the UE through a Timing Advance Command (RAR) field of a Random Access Response (RAR).

TA adjustment in Radio Resource Control (RRC) connected state: although the UE and the gNB are synchronized in uplink during the random access procedure, the timing of the uplink signal arriving at the gNB may change with time, and therefore, the UE needs to continuously update its uplink timing advance to maintain uplink synchronization. If the TA of a certain UE needs to be corrected, the gNB sends a timing advance command to the UE, and requests the UE to adjust uplink timing. The timing advance command is sent to the UE through a media Access Control Element (MAC CE).

For the characteristics of large coverage of NTN cell and large signal transmission delay, in order to facilitate the UE to complete initial random access, the network broadcasts 1 common TA based on the signal transmission delay between the near location and the base station, as shown in fig. 3 below. For the regenerative load scenario (a), common TA =2 × d0/c; for transparent load scenario (b), TA =2 x (D01 + D02)/c. The UE sends a preamble using the broadcasted common TA, and then the network indicates a UE-specific TA value to the UE in a random access response, so that the initial TA of the UE is the result of the accumulation of both the broadcasted common TA and the UE-specific TA indicated in the random access response.

Feeder link switching can have an impact on the UE. For a regenerative-payload LEO scenario, the handoff of the feeder link may be considered transparent to the UE, since the satellite can provide the base station functionality. For the transparent transmission load scene, if the service base station is changed while the feeder link is switched, the UE needs to execute the switching; if the serving base station is not changed before and after the feeder link switching, and the connections FL1 and FL2 between the satellite and the two gateway devices are allowed to exist simultaneously during the feeder link switching, the feeder link switching is considered transparent to the UE, but in this scenario, if the Round-Trip Time (RTT) differences between FL1 and FL2 are large, the feeder link switching may cause all UEs in the cell to have a need to update the uplink TA, so as to avoid uplink desynchronization of the UE. Based on the current standard framework, one idea is that the UE sends a timing advance command MAC CE to all UEs to instruct each UE to update the uplink TA; another idea is that the network instructs all UEs to initiate random access to obtain uplink synchronization. However, these two concepts have the disadvantages that, on the one hand, a large amount of resource overhead is incurred, and on the other hand, in the case of a large number of UEs, due to resource limitation, part of the UEs may have to interrupt communication with the network due to uplink desynchronization.

Fig. 5 is a flowchart illustrating an update method of an uplink TA according to an exemplary embodiment of the present application. The embodiment is executed by the network device and the terminal in the transparent transmission NTN scenario by the method. The method comprises the following steps:

step 202: the method comprises the steps that network equipment sends TA (timing advance) adjustment information to a terminal under the condition that feeder line link switching occurs and a service base station is not changed, wherein the TA adjustment information is used for indicating the terminal to update an uplink TA;

optionally, the TA adjustment information includes at least one of the following information:

TA adjustment amount;

TA effective time;

a change in the identity of the serving satellite (or an updated identity of the serving satellite);

the identity of the terrestrial gateway changes (or the identity of the terrestrial gateway is updated).

Step 204: the terminal receives TA adjusting information which is sent by the network equipment under the condition that feeder link switching occurs and a service base station is not changed;

step 206: and the terminal updates the uplink TA according to the TA adjusting information.

In summary, in the method provided in this embodiment, when a feeder link is switched and a serving base station is not changed, a network device sends TA adjustment information to a terminal by using system information or dedicated signaling, and the terminal updates an uplink TA according to the TA adjustment information, thereby avoiding a problem that the uplink of the terminal is out of synchronization and communication with the network device has to be interrupted.

Fig. 6 is a flowchart illustrating an update method of an uplink TA according to another exemplary embodiment of the present application. The embodiment is executed by the network device and the terminal in the transparent transmission NTN scenario by using the method. The method comprises the following steps:

step 302: the method comprises the steps that network equipment sends a first TA (timing advance) adjustment instruction to a terminal in a broadcast mode under the condition that feeder line link switching occurs and a service base station is not changed, wherein the first TA adjustment instruction carries TA adjustment quantity;

under the non GEO scene of the transparent transmission load, the feeder link is switched from FL1 to FL2 due to the movement of the satellite, and the front and the back of the feeder link switching correspond to the same ground service base station. Assume that the network device completes the handoff of the feeder link at time t 1.

As shown in FIG. 7, the network device updates the period T before time T1 for the system message _n Sending system message update prompt in-house and updating in system messagePeriod T _n+1 The first TA adjustment indication (including the TA adjustment delta _ TA) is sent in a broadcast format.

The TA adjustment amount is determined according to a difference between a second RTT and a first RTT, where the second RTT is a signal transmission RTT between a second terrestrial gateway corresponding to the feeder link FL2 after the handover and the satellite, and the first RTT is a signal transmission RTT between a first terrestrial gateway corresponding to the feeder link FL1 before the handover and the satellite.

Step 304: the terminal receives a first TA adjustment instruction sent in a broadcast mode;

the terminal updates the period T in the system information _n+1 A first TA adjustment indication transmitted in a broadcast format is received.

Step 306: and the terminal updates the uplink TA based on the received first TA adjustment instruction in the system information updating period.

The terminal is in the system information updating period T _n+1 And updating the uplink TA based on the received first TA adjustment instruction. And because the first TA adjustment indication carries the TA adjustment amount, the terminal updates the uplink TA according to the TA adjustment amount.

In summary, in the method provided in this embodiment, the network device sends the first TA adjustment instruction to the one or more terminals in the form of system information, and the terminal updates the uplink TA according to the first TA adjustment instruction.

Fig. 8 is a flowchart illustrating an update method of an uplink TA according to another exemplary embodiment of the present application. The embodiment is executed by the network device and the terminal in the transparent transmission NTN scenario by the method. The method comprises the following steps:

step 402: the network equipment sends a second TA adjustment instruction to the terminal under the condition that feeder link switching occurs and a service base station is not changed, wherein the second TA adjustment instruction comprises TA adjustment amount and TA adjustment effective time;

In one example, the TA adjustment amount is determined based on a difference between a second RTT between the second terrestrial gateway and the satellite corresponding to the feeder link FL2 after the handover and a first RTT between the first terrestrial gateway and the satellite corresponding to the feeder link FL1 before the handover.

In one example, the effective time for TA adjustment is determined based on the feeder link handover completion time estimated by the network device.

The notification method of the second TA adjustment instruction includes at least one of the following methods:

mode 1: the second TA adjustment indication is carried in System Information (SI);

for example, the network device carries the second TA adjustment indication in a System Information Block (SIB).

Mode 2: the second TA adjustment indication is carried in the multicast message;

the network device groups the terminals based on the geographical location of the terminals. For example, terminals with similar geographical locations are divided into the same multicast group. For each multicast group, at least one of the following steps is also required to be executed in advance:

1. different Radio-Network Temporary identities (RNTIs) are configured for terminals belonging to different groups. For example, a first RNTI is configured for a terminal belonging to a first multicast group, and a second RNTI is configured for a terminal belonging to a second multicast group.

2. Different Physical Downlink Control Channel (PDCCH) search spaces are configured for terminals belonging to different groups.

For example, a first PDCCH search space is configured for terminals belonging to a first multicast group, and a second PDCCH search space is configured for terminals belonging to a second multicast group. The resources corresponding to the plurality of PDCCH search spaces do not overlap each other in the time domain.

3. Different Control Resource sets (Control Resource Set) are configured for terminals belonging to different groups.

For example, a first control resource set is configured for terminals belonging to a first multicast group, and a control resource set is configured for terminals belonging to a second multicast group. The resources corresponding to the multiple control resource sets do not overlap with each other in the frequency domain.

Optionally, at least one of the RNTI, the PDCCH search space, and the control resource set is configured by using system information or UE-specific signaling.

Mode 3: the second TA adjustment indication is carried in UE-specific signaling.

For example, the second TA adjustment indication is carried in the UE-specific timing advance command MAC CE.

Step 404: the terminal receives a second TA adjustment instruction;

this step includes, but is not limited to, at least one of the following:

mode 1: the second TA adjustment indication is carried in the system information;

for example, the terminal receives the SIB broadcasted by the network device, and reads the second TA adjustment indication from the SIB.

it is assumed that the terminal belongs to a first group, which is divided by the network device according to the geographical location of the terminal. The method for receiving the multicast message by the terminal comprises at least one of the following methods:

1. the terminal receives a first RNTI configured for a group where the terminal is located. Wherein the terminals belonging to different groups are configured with different RNTIs. And the terminal monitors the multicast PDCCH according to the first RNTI and receives a second TA adjustment instruction from the multicast PDCCH.

2. The method comprises the steps that a terminal receives a first PDCCH search space configured for a group where the terminal is located; wherein terminals belonging to different groups are configured with different PDCCH search spaces. And the terminal monitors the multicast PDCCH in the first PDCCH search space and receives a second TA adjustment instruction from the multicast PDCCH.

3. The terminal receives a first control resource set configured for a group in which the terminal is located; wherein, terminals belonging to different groups are configured with different control resource sets; and the terminal monitors the multicast PDCCH in the search space corresponding to the first control resource set and receives a second TA adjustment instruction from the multicast PDCCH.

For example, the terminal receives the timing advance command MAC CE transmitted by the network device, and reads the second TA adjustment instruction from the timing advance command MAC CE.

Step 406: and the terminal updates the uplink TA based on the TA adjustment amount at the effective time of TA adjustment.

As shown in fig. 9, assuming that the feeder link switching completion time estimated by the network device is t2, and the configuration effective time is t2, the terminal updates the uplink TA based on the TA adjustment amount at the effective time t2 of the TA adjustment

In summary, in the method provided in this embodiment, the network device sends the second TA adjustment instruction to one or more terminals, and the terminal updates the uplink TA according to the effective time in the second TA adjustment instruction, where the effective time is determined by the network device according to the estimated feeder link switching completion time, so that the terminal can update the uplink TA at a more accurate time.

Fig. 10 is a flowchart illustrating an update method of an uplink TA according to another exemplary embodiment of the present application. In this embodiment, the method is executed by a network device and a terminal in an NTN scenario, and the method includes:

step 502: the network device sends a third TA adjustment instruction to the terminal in a broadcast form, where the third TA adjustment instruction includes: a change in identification of the serving satellite;

the third TA adjustment indication carries: a first identifier of the first service satellite before the handoff and a second identifier of the second service satellite after the handoff. Or, the third TA adjustment indication carries: a second identity of the second service satellite after the handoff.

Optionally, a first identifier of the serving satellite before handover is stored in the terminal. The third TA adjustment indication carries the second identifier of the switched second service satellite, and signaling overhead of the third TA adjustment indication can be reduced.

Step 504: the terminal receives a third TA adjusting instruction sent in a broadcast mode, wherein the third TA adjusting instruction comprises the following steps: a change in identification of the serving satellite;

step 506: the terminal determines a first satellite position before switching and a second satellite position after switching according to the change of the identification; calculating to obtain TA adjustment quantity according to the first satellite position and the second satellite position, and updating the uplink TA according to the TA adjustment quantity;

the terminal stores ephemeris information, and the ephemeris information includes an identifier of the satellite and information related to a motion trajectory of the satellite (e.g., a motion direction, a motion speed, etc. of the satellite). And the terminal determines a first satellite position before switching in the ephemeris information according to the first identifier and determines a second satellite position after switching in the ephemeris information according to the second identifier.

The terminal calculates TA1 corresponding to the feeder link FL1 before switching according to the first satellite position before switching and the ground gateway position; the terminal calculates TA2 corresponding to the switched feeder link FL2 according to the switched second satellite position and the switched ground gateway position; the terminal determines a TA adjustment amount TA = TA2-TA1, and adjusts its TA based on the delta TA.

In summary, in the method provided in this embodiment, the network device sends the identifier change of the service satellite, and the terminal calculates the TA adjustment amount by itself, so that the calculation amount of the network device can be reduced, the calculation capability of the terminal itself is fully utilized, and the calculation resource of the network device is saved.

Fig. 11 is a flowchart illustrating an update method of an uplink TA according to another exemplary embodiment of the present application. The embodiment is executed by a network device and a terminal in a transparent transmission NTN scenario by the method, which includes:

step 602: the network device sends a third TA adjustment instruction to the terminal in a broadcast form, where the third TA adjustment instruction includes: the identity of the ground gateway changes;

the third TA adjustment indication carries: the third identifier of the first ground gateway before switching and the fourth identifier of the second ground gateway after switching. Or, the third TA adjustment indication carries: and a fourth identifier of the second ground gateway after switching.

Optionally, a third identifier of the first terrestrial gateway before handover is stored in the terminal. The third TA adjustment instruction carries the switched fourth identifier of the second ground gateway, and the signaling overhead of the third TA adjustment instruction can be reduced.

Step 604: the terminal receives a third TA adjusting instruction sent in a broadcast mode, wherein the third TA adjusting instruction comprises the following steps: the identity of the ground gateway changes;

the terminal stores the identification of the ground gateway and the corresponding relation between the ground gateway position of the ground gateway. And the terminal determines the position of the first gateway before switching in the corresponding relation according to the third identifier and determines the position of the second gateway after switching in the corresponding relation according to the fourth identifier.

Step 606: and the terminal determines the position of a first gateway and the position of a second gateway before switching according to the change of the identifier, calculates the TA adjustment amount according to the position of the first gateway and the position of the second gateway, and updates the uplink TA according to the TA adjustment amount.

The terminal calculates TA1 corresponding to the feeder link FL1 before switching according to the service satellite position and the first gateway position; the terminal calculates TA2 corresponding to the switched feeder link FL2 according to the service satellite position and the second gateway position; the terminal determines a TA adjustment amount TA = TA2-TA1, and adjusts its TA based on the delta TA.

In summary, in the method provided in this embodiment, the network device sends the identifier change of the ground gateway, and the terminal calculates the TA adjustment amount by itself, so that the calculation amount of the network device can be reduced, the calculation capability of the terminal itself is fully utilized, and the calculation resources of the network device are saved.

Fig. 12 is a block diagram illustrating an apparatus for updating an uplink timing advance TA according to an exemplary embodiment of the present application. The device comprises:

a sending module 1220, configured to send TA adjustment information to a terminal when feeder link switching occurs and a serving base station is not changed, where the TA adjustment information is used to instruct the terminal to update an uplink TA.

In an optional design of this embodiment, the sending module 1220 is configured to send, to the terminal, a first TA adjustment indication in a broadcast form, where the first TA adjustment indication is used to instruct the terminal to update the TA based on the received first TA adjustment indication in a system information update period.

In an optional design of this embodiment, the sending module 1220 is configured to send a second TA adjustment indication to the terminal, where the second TA adjustment indication includes a TA adjustment amount and an effective time of TA adjustment, and the second TA adjustment indication is used to indicate the effective time of the TA adjustment by the terminal, and update the TA based on the TA adjustment amount.

In an optional design of this embodiment, the second TA adjustment indication is carried in system information.

In an optional design of this embodiment, the second TA adjustment indication is carried in a multicast message.

In an optional design of this embodiment, the apparatus further includes:

a grouping module 1240, configured to group the terminals based on the geographic location of the terminals.

In an optional design of this embodiment, the apparatus further includes:

a configuring module 1260, configured to configure different radio network temporary indication RNTIs for terminals belonging to different groups.

In an optional design of this embodiment, the configuring module 1260 is configured to configure different PDCCH search spaces for terminals belonging to different groups.

In an optional design of this embodiment, the configuring module 1260 is configured to configure different sets of control resources for terminals belonging to different groups.

In an optional design of this embodiment, the second TA adjustment indication is carried in UE specific signaling.

In an optional design of this embodiment, the sending module 1220 is configured to send, to the terminal, an identifier change of a serving satellite in a broadcast form, where the identifier change of the serving satellite is used to instruct the terminal to update the TA according to a satellite position of the serving satellite; or, the sending module 1220 is configured to send, to the terminal, an identifier change of a ground gateway in a broadcast manner, where the identifier change of the ground gateway is used to instruct the terminal to update the TA according to the geographic location of the ground gateway.

Fig. 13 is a block diagram illustrating an apparatus for updating an uplink timing advance TA according to an exemplary embodiment of the present application, where the apparatus includes:

a receiving module 1320, configured to receive TA adjustment information, where the TA adjustment information is sent by a network device when a feeder link is switched and a serving base station is not changed;

an updating module 1340, configured to update the uplink TA according to the TA adjustment information.

In an optional design of this embodiment, the receiving module 1320 is configured to receive a first TA adjustment indication sent in a broadcast form;

the updating module 1340 configured to update the TA based on the received first TA adjustment indication in a system information update period.

In an optional design of this embodiment, the receiving module 1320 is configured to receive a second TA adjustment indication, where the second TA adjustment indication includes a TA adjustment amount and an effective time of TA adjustment;

the updating module 1340 configured to update the TA based on the TA adjustment amount at the effective time of the TA adjustment.

In an optional design of this embodiment, the receiving module 1320 is configured to receive a first radio network temporary indicator RNTI configured for a packet in which the terminal is located; wherein the terminals belonging to different groups are configured with different RNTIs; monitoring a multicast Physical Downlink Control Channel (PDCCH) according to the first RNTI, and receiving the second TA adjustment instruction from the multicast PDCCH.

In an optional design of this embodiment, the receiving module 1320 is configured to receive a first PDCCH search space configured for a packet where the terminal is located; wherein the terminals belonging to different groups are configured with different PDCCH search spaces; and monitoring a multicast PDCCH in the first PDCCH search space, and receiving the second TA adjustment indication from the multicast PDCCH.

In an optional design of this embodiment, the receiving module 1320 is configured to receive a first set of control resources configured for a group in which the terminal is located; wherein, terminals belonging to different groups are configured with different control resource sets;

the receiving module 1320 is configured to monitor a multicast physical downlink control channel PDCCH in a search space corresponding to the first control resource set, and receive the second TA adjustment instruction from the multicast PDCCH.

In an optional design of this embodiment, the second TA adjustment indication is carried in UE-specific signaling.

In an optional design of this embodiment, the receiving module 1320 is configured to receive the identification change of the service satellite transmitted in a broadcast form; the updating module 1340 is configured to determine a first satellite position before handover and a second satellite position after handover according to the identifier change, calculate a TA adjustment amount according to the first satellite position and the second satellite position, and update the TA according to the TA adjustment amount; or, the receiving module 1320 is configured to receive the identifier change of the terrestrial gateway sent in a broadcast form; the updating module 1340 is configured to determine a first gateway position before the handover and a second gateway position after the handover according to the identifier change, calculate a TA adjustment amount according to the first gateway position and the second gateway position, and update the TA according to the TA adjustment amount.

Fig. 14 shows a schematic structural diagram of a communication device (network device or terminal) provided in an exemplary embodiment of the present application, where the communication device includes: a processor 101, a receiver 102, a transmitter 103, a memory 104, and a bus 105.

The processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by executing software programs and modules.

The receiver 102 and the transmitter 103 may be implemented as one communication component, which may be a communication chip.

The memory 104 is connected to the processor 101 by a bus 105.

The memory 104 may be configured to store at least one instruction for execution by the processor 101 to implement the various steps in the above-described method embodiments.

Further, the memory 104 may be implemented by any type or combination of volatile or non-volatile storage devices, including, but not limited to: magnetic or optical disks, electrically Erasable Programmable Read Only Memories (EEPROMs), erasable Programmable Read Only Memories (EPROMs), static Random Access Memories (SRAMs), read-Only memories (ROMs), magnetic memories, flash memories, programmable Read Only Memories (PROMs).

In an exemplary embodiment, a computer-readable storage medium is further provided, where at least one instruction, at least one program, a set of codes, or a set of instructions is stored in the computer-readable storage medium, and the at least one instruction, the at least one program, the set of codes, or the set of instructions is loaded and executed by the processor to implement the method for updating an uplink timing advance TA performed by a terminal device or a network device according to the foregoing method embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is intended only to illustrate the alternative embodiments of the present application, and should not be construed as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

An updating method of an uplink Timing Advance (TA) is applied to network equipment in a transparent load non-terrestrial communication network (NTN) scene, and comprises the following steps:

and sending TA (timing advance) adjustment information to the terminal under the condition that feeder link switching occurs and a service base station is not changed, wherein the TA adjustment information is used for indicating the terminal to update the uplink TA.
The method of claim 1, wherein sending TA adjustment information to the terminal comprises:

sending a first TA adjustment instruction to the terminal in a broadcast mode, wherein the first TA adjustment instruction is used for indicating the terminal to update the TA based on the received first TA adjustment instruction in a system information updating period.
The method of claim 1, wherein sending the TA adjustment information to the terminal comprises:

and sending a second TA adjustment instruction to the terminal, wherein the second TA adjustment instruction comprises TA adjustment amount and TA adjustment effective time, and the second TA adjustment instruction is used for indicating the TA adjustment effective time of the terminal, and updating the TA based on the TA adjustment amount.
The method of claim 3, wherein the second TA adjustment indication is carried in system information.
The method of claim 3, wherein the second TA adjustment indication is carried in a multicast message.
The method according to claim 3 or 5, characterized in that the method further comprises:

and grouping the terminals based on the geographical positions of the terminals.
The method of claim 6, further comprising:

different radio network temporary indication RNTIs are configured for terminals belonging to different groups.
The method of claim 6, further comprising:

and configuring different Physical Downlink Control Channel (PDCCH) search spaces for terminals belonging to different groups.
The method of claim 6, further comprising:

different sets of control resources are configured for terminals belonging to different groups.
The method of claim 3, wherein the second TA adjustment indication is carried in User Equipment (UE) -specific signaling.
The method of claim 1, wherein sending the TA adjustment information to the terminal comprises:

sending the identification change of a service satellite to the terminal in a broadcasting mode, wherein the identification change of the service satellite is used for indicating the terminal to update the TA according to the satellite position of the service satellite;

or the like, or, alternatively,

and sending the identification change of the ground gateway to the terminal in a broadcasting mode, wherein the identification change of the ground gateway is used for indicating the terminal to update the TA according to the geographical position of the ground gateway.
A method for updating an uplink timing advance TA is applied to a terminal in an NTN scene of a transparent transmission load non-terrestrial communication network, and comprises the following steps:

receiving TA adjustment information, wherein the TA adjustment information is sent by a network device under the condition that feeder line link switching occurs and a service base station is not changed;

and updating the uplink TA according to the TA adjusting information.
The method of claim 12, wherein receiving the TA adjustment information comprises:

receiving a first TA adjustment instruction transmitted in a broadcast mode;

the updating the uplink TA according to the TA adjustment information includes:

updating the TA based on the received first TA adjustment indication within a system information update period.
The method of claim 12, wherein the receiving the TA adjustment information comprises:

receiving a second TA adjustment indication, wherein the second TA adjustment indication comprises a TA adjustment amount and an effective time of TA adjustment;

the updating the uplink TA according to the TA adjustment information includes:

updating the TA based on the TA adjustment amount at the TA adjustment effective time.
The method of claim 14, wherein the second TA adjustment indication is carried in system information.
The method of claim 14, wherein the second TA adjustment indication is carried in a multicast message.
The method of claim 16, further comprising:

receiving a first Radio Network Temporary Indication (RNTI) configured for a group where the terminal is located; wherein the terminals belonging to different groups are configured with different RNTIs;

the receiving a second TA adjustment indication comprises:

monitoring a multicast Physical Downlink Control Channel (PDCCH) according to the first RNTI, and receiving the second TA adjustment instruction from the multicast PDCCH.
The method of claim 16, further comprising:

receiving a first Physical Downlink Control Channel (PDCCH) search space configured for a group where the terminal is located; wherein the terminals belonging to different groups are configured with different PDCCH search spaces;

the receiving a second TA adjustment indication comprises:

and monitoring a multicast PDCCH in the first PDCCH search space, and receiving the second TA adjustment indication from the multicast PDCCH.
The method of claim 16, further comprising:

receiving a first control resource set configured for a group in which the terminal is located; wherein, terminals belonging to different groups are configured with different control resource sets;

the receiving a second TA adjustment indication comprises:

and monitoring a multicast Physical Downlink Control Channel (PDCCH) in a search space corresponding to the first control resource set, and receiving the second TA adjustment instruction from the multicast PDCCH.
The method of claim 14, wherein the second TA adjustment indication is carried in user equipment, UE, dedicated signaling.
The method of claim 12, wherein the receiving TA adjustment information and updating the uplink TA according to the TA adjustment information comprises:

receiving the identification change of the service satellite transmitted in a broadcasting mode; determining a first satellite position before switching and a second satellite position after switching according to the identifier change, calculating to obtain a TA (timing advance) adjustment amount according to the first satellite position and the second satellite position, and updating the TA according to the TA adjustment amount;

or the like, or, alternatively,

receiving the identification change of the ground gateway sent in a broadcasting mode; and determining a first gateway position before switching and a second gateway position after switching according to the identifier change, calculating to obtain TA adjustment quantity according to the first gateway position and the second gateway position, and updating the TA according to the TA adjustment quantity.
An updating device of an uplink Timing Advance (TA), which is applied to a transparent transport load (NTN) non-terrestrial communication network, the device comprising:

a sending module, configured to send TA adjustment information to a terminal under a condition that feeder link switching occurs and a serving base station is not changed, where the TA adjustment information is used to instruct the terminal to update an uplink TA.
The apparatus of claim 22, wherein the means for sending is configured to send a first TA adjustment indication to the terminal in a broadcast manner, and wherein the first TA adjustment indication is used to instruct the terminal to update the TA based on the received first TA adjustment indication within a system information update period.
The apparatus of claim 22, wherein the means for sending sends a second TA adjustment indication to the terminal, the second TA adjustment indication comprising an amount of TA adjustment and a time in effect for TA adjustment, and wherein the second TA adjustment indication indicates that the terminal is in the time in effect for TA adjustment, and wherein the TA is updated based on the amount of TA adjustment.
The apparatus of claim 24, wherein the second TA adjustment indication is carried in system information.
The apparatus of claim 24, wherein the second TA adjustment indication is carried in a multicast message.
The apparatus as claimed in claim 24 or 26, further comprising:

and the grouping module is used for grouping the terminals based on the geographical positions of the terminals.
The apparatus of claim 27, further comprising:

and the configuration module is used for configuring different radio network temporary indication RNTIs for the terminals belonging to different groups.
The apparatus of claim 27, further comprising:

and the configuration module is used for configuring different Physical Downlink Control Channel (PDCCH) search spaces for terminals belonging to different groups.
The apparatus of claim 27, further comprising:

and the configuration module is used for configuring different control resource sets for the terminals belonging to different groups.
The apparatus of claim 23, wherein the second TA adjustment indication is carried in UE-specific signaling.
The apparatus of claim 22,

the sending module is configured to send an identifier change of a service satellite to the terminal in a broadcast manner, where the identifier change of the service satellite is used to instruct the terminal to update the TA according to a satellite position of the service satellite;

or the like, or a combination thereof,

the sending module is configured to send an identifier change of a ground gateway to the terminal in a broadcast manner, where the identifier change of the ground gateway is used to instruct the terminal to update the TA according to the geographic location of the ground gateway.
An updating device of an uplink Timing Advance (TA), which is applied to a transparent load transmission non-terrestrial communication network (NTN), and comprises:

a receiving module, configured to receive TA adjustment information, where the TA adjustment information is sent by a network device when a feeder link is switched and a serving base station is not changed;

and the updating module is used for updating the uplink TA according to the TA regulation information.
The apparatus of claim 33,

the receiving module is configured to receive a first TA adjustment instruction sent in a broadcast form;

the update module is configured to update the TA based on the received first TA adjustment indication in a system information update period.
The apparatus of claim 33,

the receiving module is configured to receive a second TA adjustment instruction, where the second TA adjustment instruction includes a TA adjustment amount and an effective time of TA adjustment;

the updating module is configured to update the TA based on the TA adjustment amount at the effective time of the TA adjustment.
The apparatus of claim 35, wherein the second TA adjustment indication is carried in system information.
The apparatus of claim 35, wherein the second TA adjustment indication is carried in a multicast message.
The apparatus of claim 37,

the receiving module is configured to receive a first radio network temporary indicator RNTI configured for a group where the terminal is located; wherein the terminals belonging to different groups are configured with different RNTIs; monitoring a multicast Physical Downlink Control Channel (PDCCH) according to the first RNTI, and receiving the second TA adjustment instruction from the multicast PDCCH.
The apparatus of claim 37,

the receiving module is configured to receive a first Physical Downlink Control Channel (PDCCH) search space configured for a packet where the terminal is located; wherein the terminals belonging to different groups are configured with different PDCCH search spaces; and monitoring a multicast PDCCH in the first PDCCH search space, and receiving the second TA adjustment indication from the multicast PDCCH.
The apparatus of claim 37,

the receiving module is configured to receive a first control resource set configured for a group in which the terminal is located; wherein, terminals belonging to different groups are configured with different control resource sets;

the receiving module is configured to monitor a multicast physical downlink control channel PDCCH on a search space corresponding to the first control resource set, and receive the second TA adjustment instruction from the multicast PDCCH.
The apparatus of claim 35, wherein the second TA adjustment indication is carried in UE-specific signaling.
The apparatus of claim 33,

the receiving module is used for receiving the identification change of the service satellite transmitted in a broadcasting mode; the updating module is used for determining a first satellite position before switching and a second satellite position after switching according to the identifier change, calculating a TA (timing advance) adjustment amount according to the first satellite position and the second satellite position, and updating the TA according to the TA adjustment amount;

or the like, or, alternatively,

the receiving module is used for receiving the identification change of the ground gateway sent in a broadcasting mode; and the updating module is used for determining a first gateway position before switching and a second gateway position after switching according to the identifier change, calculating a TA (timing advance) adjustment amount according to the first gateway position and the second gateway position, and updating the TA according to the TA adjustment amount.
A terminal, characterized in that the terminal comprises:

a processor;

a transceiver coupled to the processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the method of updating an uplink timing advance, TA, according to any one of claims 1 to 21.
A network device, characterized in that the network device comprises:

a processor;

a transceiver coupled to the processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to load and execute the executable instructions to implement the method for updating uplink timing advance, TA, according to any one of claims 22 to 42.
A computer-readable storage medium storing executable instructions for loading and executing by the processor to implement the method for updating an uplink Timing Advance (TA) according to any one of claims 1 to 42.