CN116261909A

CN116261909A - Pre-compensation method for timing advance in NTN (network time network), terminal equipment and network equipment

Info

Publication number: CN116261909A
Application number: CN202080105219.1A
Authority: CN
Inventors: 于新磊; 李海涛; 胡奕
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2023-06-13
Also published as: WO2022120842A1

Abstract

The embodiment of the application provides a pre-compensation method, terminal equipment and network equipment for timing advance in an NTN (network time slot) network, wherein the method comprises the following steps: receiving delay information of a feed link; receiving indication information, wherein the indication information is used for indicating whether TA pre-compensation is performed based on the delay information; and in the random access process, TA precompensation is carried out according to the indication information. Therefore, different terminal devices in the service cell transmit the lead codes in different precompensation modes, and interference in the cell is avoided.

Description

Pre-compensation method for timing advance in NTN (network time network), terminal equipment and network equipment

Technical Field

The embodiments of the present application relate to the field of communications, and more particularly, to a precompensation method, a terminal device, and a network device for Timing Advance (TA) in a Non-terrestrial communication network (Non-Terrestrial Network, NTN).

Background

An important feature of uplink transmission is that different terminal devices are orthogonally multiple-access in time-frequency, i.e. uplink transmissions from different terminal devices in the same cell do not interfere with each other. In order to ensure orthogonality of the uplink transmissions, avoiding intra-cell interference, the network devices require that signals from different terminal devices at the same time but different frequency domain resources arrive at the network device at substantially aligned times. In order to guarantee time synchronization of the network equipment side, a New air interface (NR) and NTN system support a TA mechanism.

In NTN networks, since the delay from each terminal device in a cell to a network device is large and the difference is large, it is considered that the terminal device performs TA precompensation. For NTN networks comprising a terminal device, a satellite and a network device, the terminal device may typically estimate the delay of a service link (service link) between the terminal device and the satellite by means of location information and ephemeris information, but the delay of a feeder link (feeder link) between the satellite and the network device still exists, and the network device typically broadcasts delay information of the feeder link. For the terminal equipment, it is uncertain whether to realize the alignment of uplink timing and downlink timing at the network equipment side or the alignment of uplink timing and downlink timing at the satellite side, so in the random access process, the terminal equipment does not determine whether to combine the delay information of the feeder link when performing TA precompensation, and for the terminal equipment of the same cell, if some terminal equipment combines the delay information of the feeder link, and some terminal equipment does not combine the delay information of the feeder link, the time of leading the preamble (preamble) sent by each terminal equipment to arrive at the network equipment is inconsistent, thereby causing interference in the cell.

Disclosure of Invention

The embodiment of the application provides a pre-compensation method, terminal equipment and network equipment for timing advance in an NTN (network time slot) network, so that interference in a cell can be eliminated.

In a first aspect, a method for pre-compensating for timing advance in an NTN network is provided, including: receiving delay information of a feed link; receiving indication information, wherein the indication information is used for indicating whether TA pre-compensation is performed based on the delay information; and in the random access process, TA precompensation is carried out according to the indication information.

In a second aspect, a method for pre-compensating for timing advance in an NTN network is provided, including: transmitting delay information of a feed link; and sending indication information, wherein the indication information is used for indicating whether TA pre-compensation is performed based on the delay information.

In a third aspect, a terminal device is provided for performing the method in the first aspect or each implementation manner thereof.

Specifically, the terminal device comprises functional modules for performing the method of the first aspect or its implementation manner.

In a fourth aspect, a network device is provided for performing the method of the second aspect or implementations thereof.

In particular, the network device comprises functional modules for performing the method of the second aspect or implementations thereof described above.

In a fifth aspect, a terminal device is provided comprising a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory and executing the method in the first aspect or various implementation manners thereof.

In a sixth aspect, a network device is provided that includes a processor and a memory. The memory is for storing a computer program and the processor is for calling and running the computer program stored in the memory for performing the method of the second aspect or implementations thereof described above.

A seventh aspect provides an apparatus for implementing the method of any one of the first to second aspects or each implementation thereof.

Specifically, the device comprises: a processor for calling and running a computer program from a memory, causing a device in which the apparatus is installed to perform the method as in any one of the first to second aspects or implementations thereof described above.

In an eighth aspect, a computer-readable storage medium is provided for storing a computer program, the computer program causing a computer to perform the method of any one of the first to second aspects or each implementation thereof.

In a ninth aspect, there is provided a computer program product comprising computer program instructions for causing a computer to perform the method of any one of the first to second aspects or implementations thereof.

In a tenth aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of any one of the first to second aspects or implementations thereof.

In the application, the terminal equipment can receive the indication of the network equipment to determine whether to perform TA precompensation based on the delay information of the feedback link, so that the terminal equipment in the service cell adopts a consistent TA precompensation mode, thereby avoiding that different terminal equipment in the service cell adopts different precompensation modes to transmit the preamble, and further avoiding the interference in the cell.

Drawings

Fig. 1 is a schematic diagram of an architecture of an NTN system according to an embodiment of the present application;

fig. 2 is a flow chart of a contention-based four-step random access procedure;

fig. 3 is a flow chart of a non-contention based four-step random access procedure;

fig. 4 is a flow chart of a contention-based two-step random access procedure;

fig. 5 is a flow chart of contention-based backoff from two-step random access to four-step random access;

Fig. 6 is a flow chart of a non-contention based two-step random access procedure;

fig. 7 is a schematic diagram of time synchronization on the gNB side according to an embodiment of the present disclosure;

fig. 8 is an interactive flowchart of a pre-compensation method for timing advance in an NTN network according to an embodiment of the present application;

fig. 9 shows a schematic block diagram of a terminal device 900 according to an embodiment of the present application;

fig. 10 shows a schematic block diagram of a network device 1000 according to an embodiment of the present application;

fig. 11 is a schematic block diagram of a communication device 1100 according to an embodiment of the present application;

FIG. 12 is a schematic block diagram of an apparatus of an embodiment of the present application;

fig. 13 is a schematic block diagram of a communication system 1300 provided in an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden for the embodiments herein, are intended to be within the scope of the present application.

The technical solution of the embodiment of the present application may be applied to NTN systems, but is not limited thereto.

The architecture of the NTN system in the present application is described below with reference to fig. 1.

Fig. 1 is a schematic diagram of an architecture of an NTN system according to an embodiment of the present application. Referring to FIG. 1, a terminal device 1101, a satellite 1102, and a network device 1103 are included, wireless communication between terminal device 1101 and satellite 1102 is enabled, and communication between satellite 1102 and network device 1103 is enabled. The network formed between terminal device 1101, satellite 1102, and network device 1103 may also be referred to as NTN. In the architecture of the communication system shown in FIG. 1, satellite 1102 may not have the functionality of a base station and communication between terminal device 1101 and network device 1103 may require transit through satellite 1102. Alternatively, a plurality of network devices 1103 may be included in the NTN system, and the coverage area of each network device 1103 may include other number of terminal devices, which is not limited in the embodiment of the present application.

It should be appreciated that a terminal device can also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, a User Equipment, or the like. The terminal device may be a Station (ST) in a WLAN, may be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA) device, a handheld device with wireless communication functionality, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, and a next generation communication system, such as a terminal device in an NR network or a terminal device in a future evolved public land mobile network (Public Land Mobile Network, PLMN) network, etc.

In embodiments of the present application, the terminal device may be deployed on land, including indoor or outdoor, hand-held, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.).

By way of example, and not limitation, in embodiments of the present application, the terminal device may be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

It should be understood that the network device may be a device for communicating with a mobile device. The network device may be an Access Point (AP) in a wireless local area network (Wireless Local Area Networks, WLAN), a base station (Base Transceiver Station, BTS) in a global system for mobile communications (Global System of Mobile communication, GSM) system or code division multiple Access (Code Division Multiple Access, CDMA), a base station (NodeB, NB) in wideband code division multiple Access (Wideband Code Division Multiple Access, WCDMA), an evolved base station (Evolutional Node B, eNB or eNodeB) in long term evolution (Long Term Evolution, LTE), or a relay station or Access Point, or a vehicle device, a wearable device, and a network device (gNB) in an NR network or a network device in a future evolved PLMN network, etc.

In this embodiment of the present application, a network device may provide a service for a cell, where a terminal device communicates with the network device through a transmission resource (e.g., a frequency domain resource, or a spectrum resource) used by the cell, where the cell may be a cell corresponding to a network device (e.g., a base station), and the cell may belong to a macro base station, or may belong to a base station corresponding to a Small cell (Small cell), where the Small cell may include: urban cells (Metro cells), micro cells (Micro cells), pico cells (Pico cells), femto cells (Femto cells) and the like, and the small cells have the characteristics of small coverage area and low transmitting power and are suitable for providing high-rate data transmission services.

It should be appreciated that the satellites may be Low Earth Orbit (LEO) satellites, medium earth orbit (medium earth orbit, MEO) satellites, geosynchronous orbit (geostationary earth orbit, GEO) satellites, high elliptical orbit (High Elliptical Orbit, HEO) satellites, and the like.

It should be noted that, fig. 1 illustrates, by way of example, a system to which the present application is applicable, and of course, the method shown in the embodiment of the present application may also be applicable to other systems and the like, and the embodiment of the present application is not limited thereto in particular.

Optionally, the NTN system shown in fig. 1 may further include other network entities such as a gateway, which is not limited in the embodiments of the present application.

Optionally, the NTN system in the embodiments of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or a Stand Alone (SA) fabric scenario.

Alternatively, embodiments of the present application may be applied to unlicensed spectrum, as well as licensed spectrum. The unlicensed spectrum may be considered as a shared spectrum, and the licensed spectrum may be considered as an unshared spectrum.

It should be understood that the terms "system" and "network" are often used interchangeably herein.

In the description of the embodiments of the present application, the term "corresponding" may indicate that there is a direct correspondence or an indirect correspondence between the two, or may indicate that there is an association between the two, or may indicate a relationship between the two and the indicated, configured, or the like.

In order to clearly illustrate the ideas of the embodiments of the present application, the related technical contents of the embodiments of the present application will be briefly described first.

1. The random access procedure is mainly triggered by the following events:

(1) Initial access (initial access): the terminal device goes from a radio resource control (Radio Resource Control, RRC) IDLE state (rrc_idle) to an RRC CONNECTED state (rrc_connected).

(2) RRC connection reestablishment (RRC Connection Re-establisment).

(3) A handover, i.e. a terminal device needs to establish uplink synchronization with a new cell.

(4) Under rrc_connected, downlink (DL) data arrives, and the Uplink (UL) is in an out-of-sync state.

(5) Under rrc_connected, UL data arrives, and UL is in an out-of-sync state.

(6) Under rrc_connected, UL data arrives, and no physical uplink control channel (Physical Uplink Control Channel, PUCCH) resources are available for scheduling request (Scheduling Request, SR) transmission. At this time, the terminal device already in the uplink synchronization state may be allowed to use a random access channel (Random Access Channel, RACH) instead of the SR role.

(7) A synchronous reconfiguration request from RRC.

(8) The terminal transitions from the RRC INACTIVE state (rrc_inactive) to the ACTIVE state (rrc_active).

(9) Time alignment is established during Secondary Cell (SCell) addition.

(10) The terminal device requests other system information (Other System Information, OSI).

(11) The terminal device beam failure recovery (beam failure recovery).

2. Random access process:

in the NR version (Release, rel) -15, the following two random access methods, a contention-based random access method and a non-contention-based random access method, are mainly supported.

For ease of understanding, the random access procedure will be briefly described below in connection with fig. 2 and 3.

Fig. 2 is a flow chart of a contention-based four-step random access procedure.

As shown in fig. 2, the random access procedure may include the following four steps:

step 1, msg 1.

The terminal device sends an Msg 1 to the network device to tell the network device that the terminal device initiates a random access request, where the Msg 1 carries a random access preamble (Random Access Preamble, RAP), or is called a random access preamble sequence, a preamble, etc. Meanwhile, the Msg 1 can also be used for the network equipment to estimate the transmission delay between the network equipment and the terminal equipment and calibrate the uplink time according to the transmission delay.

Specifically, the terminal device selects a preamble index (index) and a physical random access channel (PhysicalRandom Access Channel, PRACH) resource for transmitting the preamble; the terminal device then transmits the Preamble on the PRACH. Wherein the network device informs all terminal devices on which time-frequency resources the preamble, e.g., SIB1, is allowed to be transmitted by broadcasting a system information block (System Information Block, SIB).

Step 2, msg 2.

After receiving the Msg 1 sent by the terminal device, the network device sends an Msg 2, i.e. a random access response (Random Access Response, RAR) message to the terminal device. The Msg 2 may carry, for example, a TA, an uplink grant command, such as configuration of uplink resources, a Temporary Cell-Radio Network Temporary Identity (TC-RNTI), and the like.

The terminal device listens to the physical downlink control channel (Physical Downlink Control Channel, PDCCH) within a random access response time window (RAR window) for receiving the RAR message replied by the network device. The RAR message may be descrambled using a corresponding random access radio network temporary identifier (Random Access Radio Network Temporary Identifier, RA-RNTI).

If the terminal equipment does not receive the RAR message replied by the network equipment in the RAR time window, the random access process is considered to be failed.

If the terminal device successfully receives an RAR message, and the preamble index (preamble index) carried in the RAR message is the same as the preamble index sent by the terminal device through Msg 1, the terminal device considers that the RAR is successfully received, and then the terminal device can stop monitoring in the RAR time window.

Wherein, the Msg 2 may include RAR messages for a plurality of terminal devices, and the RAR message of each terminal device may include a Random Access Preamble Identifier (RAPID) adopted by the terminal device, information of resources used for transmitting the Msg 3, TA adjustment information, TC-RNTI, and the like.

Step 3, msg 3.

After receiving the RAR message, the terminal device determines whether the RAR is an RAR message belonging to the terminal device, for example, the terminal device can check by using the preamble identifier, and after determining that the RAR message is an RAR message belonging to the terminal device, the terminal device generates Msg 3 in the RRC layer and sends the Msg 3 to the network device. Wherein identification information of the terminal device and the like need to be carried.

Specifically, msg 3 in step 3 of the 4-step random access procedure may include different content for different random access trigger events for scheduling transmissions (Scheduled Transmission).

For example, for the initial Access scenario, the Msg 3 may include an RRC connection request (RRC Connection Request) generated by an RRC layer, where at least Non-Access Stratum (NAS) identification information of the terminal device is carried, and may also carry, for example, a Serving temporary mobile subscriber identity (Serving-Temporary Mobile Subscriber Identity, S-TMSI) or a random number of the terminal device.

For another example, for a connection re-establishment scenario, msg 3 may include an RRC connection re-establishment request (RRC Connection Re-establishment Request) generated by the RRC layer and not carry any NAS messages, but may also carry, for example, cell radio network temporary identity (Cell Radio Network Temporary Identifier, C-RNTI) and protocol control information (Protocol Control Information, PCI), etc.

For another example, for a handover scenario, msg 3 may include an RRC handover complete message (RRC Handover Confirm) generated by the RRC layer and the C-RNTI of the terminal device, and may also carry, for example, a buffer status report (Buffer Status Report, BSR); for other trigger events, such as the scenario of up/down data arrival, msg 3 needs to include at least the C-RNTI of the terminal device.

Step 4, msg 4.

The network device sends Msg 4 to the terminal device, and the terminal device receives Msg 4 correctly to complete contention resolution (Contention Resolution). For example, during RRC connection establishment, an RRC connection establishment message may be carried in Msg 4.

Since the terminal device in step 3 carries its unique identifier, for example, the C-RNTI or identifier information from the core network (such as S-TMSI or a random number), in the Msg 3, the network device will carry the unique identifier of the terminal device in the Msg 4 in the contention resolution mechanism to specify the terminal device that wins the contention. While other terminal devices that are not winning in contention resolution will re-initiate random access.

Fig. 3 is a flow chart of a non-contention based four-step random access procedure.

As shown in fig. 3, the random access procedure may include the first two steps in fig. 2 (i.e., step 1 and step 2 in fig. 2). Wherein:

step 0, the network device sends a random access preamble allocation (RA Preamble assignment) message to the terminal device.

Step 1, msg 1.

The terminal equipment sends Msg 1 to the network equipment so as to inform the network equipment that the terminal equipment initiates a random access request, wherein the Msg 1 carries a random access preamble.

Step 2, msg 2.

After receiving the Msg 1 sent by the terminal device, the network device sends an Msg 2, namely an RAR message, to the terminal device. The Msg 2 may carry information such as TA information, uplink grant commands such as configuration of uplink resources, and TC-RNTI.

If the terminal equipment does not receive the RAR message replied by the network equipment in the RAR time window, the random access process is considered to be failed. If the terminal equipment successfully receives an RAR message, and the index of the preamble carried in the RAR message is the same as the index of the preamble sent by the terminal equipment through Msg 1, the terminal equipment considers that the RAR is successfully received, and at the moment, the terminal equipment can stop monitoring the RAR message.

Reference may be made specifically to the foregoing descriptions of the Msg 1 and Msg 2 in the contention-based random access procedure for the Msg 1 and Msg 2 in the non-contention-based random access procedure, and for brevity, the descriptions will not be repeated here.

The NR Rel-16 version introduces a two-step random access procedure, which introduces a reduction in latency while reducing signaling overhead. Fig. 4 is a flow chart of a contention-based two-step random access procedure, which may include, as shown in fig. 4:

step 1, msg a.

Wherein MsgA comprises: preamble transmitted on PRACH and payload information transmitted on physical uplink shared channel (Physical Uplink Shared Channel, PUSCH).

Step 2, msgb.

After the MsgA transmission, the terminal device monitors the response of the network side in the configured window, and if an indication that the contention resolution issued by the network is successful is received, the terminal device ends the random access process.

Fig. 5 is a flow chart of a contention-based backoff from two-step random access to four-step random access, and as shown in fig. 5, the random access flow may include:

step 1, msg a.

Step 2, msgb.

After the MsgA transmission, the terminal device monitors the response of the network side in the configured window, and at this time, receives the rollback instruction issued by the network, and at this time, needs to execute step 3.

Step 3, msg 3.

Step 4, msg 4.

For specific reference to the foregoing description of the Msg 3 and Msg 4 in the non-contention-based four-step random access procedure, the description will not be repeated here for brevity.

Fig. 6 is a flow chart of a non-contention based two-step random access procedure, as shown in fig. 6, which may include:

Step 1, msg a.

Wherein MsgA comprises: preamble transmitted on PRACH and payload information transmitted on PUSCH.

Step 2, msgb.

After the transmission of the MsgA, the terminal device receives the MsgB, i.e. a random access response.

3. TA mechanism in NR system:

an important feature of uplink transmission is that different terminal devices are orthogonally multiple-access in time-frequency, i.e. uplink transmissions from different terminal devices in the same cell do not interfere with each other. In order to ensure orthogonality of the uplink transmissions, avoiding intra-cell interference, the network devices require that signals from different terminal devices at the same time but different frequency domain resources arrive at the network device at substantially aligned times. In order to guarantee time synchronization at the network device side, the NR supports an upstream TA mechanism.

Fig. 7 is a schematic diagram of time synchronization on the gNB side according to an embodiment of the present application, as shown in the left drawing in fig. 7, when a TA mechanism is not adopted, the uplink clock and the downlink clock on the UE side are the same, and for one downlink symbol sent on the gNB side, the time when uplink data from different UEs arrives at the gNB side is not synchronized due to different propagation delays between different UEs and the gNB. As shown in the right drawing of fig. 7, there is an offset between the uplink clock and the downlink clock at the UE side, and different UEs have different uplink TA values, i.e. a TA mechanism is introduced. The gNB can control the time when uplink data from different UEs arrives at the gNB by properly controlling the TA value corresponding to each UE, so that the time when uplink data from different UEs arrives at the gNB side is synchronized and the downlink timing at the gNB side is synchronized. Specifically, for UEs farther away from the gNB, due to the larger transmission delay, uplink data is sent in advance than UEs nearer to the gNB.

Wherein the gNB determines the TA value for each UE based on measuring the uplink transmission of the UE. The gNB sends TA commands to the UE in two ways.

Acquisition of initial TA: in the random access procedure, the gNB determines the TA value by measuring the received preamble (preamble) and transmits to the UE through the timing advance command (Timing Advance Command) field of the RAR.

Adjustment of TA in RRC connected state: although the UE and the gNB acquire uplink synchronization during the random access procedure, the timing of the uplink signal reaching the gNB may change with time, so the UE needs to continuously update its uplink TA value to maintain uplink synchronization. If the TA value of a certain UE needs to be corrected, the gNB sends a timing advance command (Timing Advance Command) to the UE requesting it to adjust the TA value. The Timing Advance Command is sent to the UE through Timing Advance Command MAC CE.

As described above, a TA mechanism is introduced in the NR system, and the NTN network has its specificity in that in the NTN network, the delay from each terminal device in one cell to the network device is large and the difference is large, in order to solve this problem, in the NTN network, the terminal device may perform TA precompensation (Timing Advance pre-accounting).

It should be noted that the TA pre-compensation is calculated by the terminal device, and the terminal device performs TA compensation in the random access process.

It should be appreciated that this TA pre-compensation is also referred to as TA compensation, TA pre-compensation value, etc., which is not limiting in this application.

For a random access response Time window in which the terminal device receives the Msg2 or the MsgB in the random access process, and a contention conflict resolution timer in which the terminal device receives the Msg4 in the four-step random access process, introducing a Time offset (offset), if the Time offset adopts a Round Trip Time (RTT) from the terminal device to the network device, the network device needs to broadcast delay information of the feeder link.

It should be noted that, in the NTN network shown in fig. 1, a terrestrial gateway may be provided between the satellite and the network device, and the feeder link refers to a link from the satellite to the terrestrial network.

Alternatively, the delay information of the feeder link may be delay on the feeder link, or factor or parameter information that causes delay on the feeder link, which is not limited in this application.

From the point of view of the terminal device, after the network device broadcasts the delay information of the feeder link, the terminal device does not know whether to use the delay information of the feeder link for estimating TA precompensation when Msg1 or MsgA is transmitted, because the terminal device does not know whether the uplink timing and the downlink timing are aligned on the network device side or the satellite side. Namely, if the uplink timing and the downlink timing of the terminal equipment need to be aligned at the network equipment side, when the terminal equipment sends Msg1 or MsgA, the delay information, the position information and the ephemeris information of the feed link need to be combined to estimate TA precompensation; if the uplink timing and the downlink timing of the terminal equipment are aligned at the satellite side, TA precompensation is not needed to be carried out by combining with the delay information of the feed link when Msg1 or MsgA is sent. If different terminal devices in the cell send the preamble by adopting an inconsistent TA precompensation mode on the same Random Access CHannel (RACH) occasion, the time when the preamble arrives at the network device may be different, which may cause intra-cell interference.

In order to solve the above technical problem, in the present application, the network device may indicate to the terminal device whether to perform TA precompensation based on the delay information of the feeder link.

The technical scheme of the application will be described in detail as follows:

fig. 8 is an interactive flowchart of a pre-compensation method for timing advance in an NTN network according to an embodiment of the present application, where, as shown in fig. 8, the method includes the following steps:

s810: the network device sends delay information of the feeder link to the terminal device.

S820: the network device sends indication information to the terminal device, wherein the indication information is used for indicating whether TA precompensation is carried out based on the delay information.

S830: and in the random access process, the terminal equipment performs TA precompensation according to the indication information.

Optionally, the delay information of the feeder link may be carried in configuration information of a serving cell where the terminal device is located, where the configuration information is sent by the network device.

Optionally, the configuration information of the serving cell further includes: configuration information of random access resources, etc., which is not limited in this application.

Alternatively, the indication information may be sent separately from or together with delay information of the feeder link, which is not limited in this application.

Optionally, the length of the indication information may be 1, the value may be 0 or 1, and when the indication information is 1, the TA precompensation is indicated based on the delay information. When the indication information takes a value of 0, the TA pre-compensation is not performed based on the delay information. Or when the indication information takes a value of 0, the TA precompensation is indicated to be carried out based on the delay information. When the indication information takes a value of 1, the TA pre-compensation is not performed based on the delay information.

The meaning of the indication information length, the value and the representation of each value is not limited in the application.

Optionally, the indication information is indicated for all terminal devices in the service cell where the terminal device is located, that is, indicated in a unified manner for all terminal devices in the service cell.

Alternatively, the above indication information may be carried in a system message or radio resource control (Radio Resource Control, RRC) dedicated signaling, but is not limited thereto.

Optionally, if the reference point at which the uplink timing and the downlink timing of the terminal device are aligned is a network device, the indication information indicates TA precompensation based on the delay information. If the reference point of the uplink timing and the downlink timing of the terminal equipment is a satellite, the indication information indicates that TA precompensation is not carried out based on the time delay information.

It should be understood that the reference point for the alignment of the uplink timing and the downlink timing of the terminal device is the network device, and the uplink timing and the downlink timing of the terminal device are also referred to as the alignment of the terminal device on the network device side. The reference point for alignment of the uplink timing and the downlink timing of the terminal device is a satellite, and the uplink timing and the downlink timing of the terminal device are also referred to as alignment on the satellite side.

Optionally, when the terminal device sends Msg1 or MsgA, TA precompensation is performed according to the indication information.

Optionally, the technical solution of the present application may be applied to a non-contention based four-step random access procedure, a non-contention based two-step random access procedure, a contention based rollback from a two-step random access to a four-step random access procedure, etc., which is not limited in this application.

Optionally, if the indication information indicates TA pre-compensation based on the delay information, the terminal device performs TA pre-compensation according to the delay information, the position information of the terminal device, and the ephemeris information, and how the terminal device performs TA pre-compensation according to the delay information, the position information of the terminal device, and the ephemeris information may adopt the prior art scheme, which is not limited in this application.

Optionally, if the indication information indicates that TA pre-compensation is not performed based on the delay information, the TA pre-compensation is performed according to the location information and the ephemeris information of the terminal device, that is, the terminal device performs TA pre-compensation only according to the location information and the ephemeris information of the terminal device, and how the terminal device performs TA pre-compensation according to the location information and the ephemeris information of the terminal device may adopt the prior art scheme, which is not limited in this application.

In summary, in the present application, the terminal device may receive an indication of the network device, so as to determine whether to perform TA precompensation based on the delay information of the feedback link, so that the terminal device in the serving cell adopts a consistent TA precompensation mode, thereby avoiding that different terminal devices in the serving cell adopt different precompensation modes to transmit the preamble, and further avoiding interference in the cell.

The method embodiment of the present application is described in detail above with reference to fig. 8, and the apparatus embodiment of the present application is described in detail below with reference to fig. 9 to 13, it being understood that the apparatus embodiment corresponds to the method embodiment, and similar descriptions may refer to the method embodiment.

Fig. 9 shows a schematic block diagram of a terminal device 900 according to an embodiment of the present application. As shown in fig. 9, the terminal device 900 includes:

A communication unit 910, configured to receive delay information of the feeder link and indication information, where the indication information is used to indicate whether to perform TA precompensation based on the delay information.

And a processing unit 920, configured to perform TA precompensation according to the indication information during the random access procedure.

Optionally, the indication information is indicated for all terminal devices within the serving cell.

Optionally, the indication information is carried in a system message or RRC dedicated signaling.

Optionally, the processing unit 920 is specifically configured to: when transmitting Msg1 or Msg A, TA precompensation is carried out according to the indication information.

Optionally, the processing unit 920 is specifically configured to: and if the indication information indicates TA pre-compensation based on the time delay information, performing TA pre-compensation according to the time delay information, the position information of the terminal equipment and the ephemeris information. And if the indication information indicates that the TA pre-compensation is not performed based on the time delay information, performing the TA pre-compensation according to the position information and the ephemeris information of the terminal equipment.

Alternatively, in some embodiments, the communication unit may be a communication interface or transceiver, or an input/output interface of a communication chip or a system on a chip. The processing unit may be one or more processors.

It should be understood that the terminal device 900 according to the embodiment of the present application may correspond to the terminal device in the embodiment of the method of the present application, and the foregoing and other operations and/or functions of each unit in the terminal device 900 are respectively for implementing the corresponding flow of the terminal device in the method shown in fig. 8, which is not described herein for brevity.

Fig. 10 shows a schematic block diagram of a network device 1000 according to an embodiment of the present application. As shown in fig. 10, the network device 1000 includes: and a communication unit 1010, configured to send delay information of the feeder link and indication information, where the indication information is used to indicate whether to perform TA precompensation based on the delay information.

Alternatively, in some embodiments, the communication unit may be a communication interface or transceiver, or an input/output interface of a communication chip or a system on a chip.

It should be understood that the network device 1000 according to the embodiment of the present application may correspond to the network device in the embodiment of the method of the present application, and the foregoing and other operations and/or functions of each unit in the network device 1000 are respectively for implementing the corresponding flow of the network device in the method shown in fig. 8, which is not described herein for brevity.

Fig. 11 is a schematic block diagram of a communication device 1100 according to an embodiment of the present application. The communication device 1100 shown in fig. 11 comprises a processor 1110, from which the processor 1110 may call and run a computer program to implement the method in the embodiments of the present application.

Optionally, as shown in fig. 11, the communication device 1100 may also include a memory 1120. Wherein the processor 1110 may call and run a computer program from the memory 1120 to implement the methods in embodiments of the present application.

Wherein the memory 1120 may be a separate device from the processor 1110 or may be integrated into the processor 1110.

Optionally, as shown in fig. 11, the communication device 1100 may further include a transceiver 1130, and the processor 1110 may control the transceiver 1130 to communicate with other devices, and in particular, may send information or data to other devices, or receive information or data sent by other devices.

The transceiver 1130 may include, among other things, a transmitter and a receiver. Transceiver 1130 may further include antennas, the number of which may be one or more.

Optionally, the communication device 1100 may be specifically a network device in the embodiment of the present application, and the communication device 1100 may implement a corresponding flow implemented by the network device in each method in the embodiment of the present application, which is not described herein for brevity.

Optionally, the communication device 1100 may be specifically a terminal device in the embodiment of the present application, and the communication device 1100 may implement a corresponding flow implemented by the terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

Fig. 12 is a schematic structural view of an apparatus of an embodiment of the present application. The apparatus 1200 shown in fig. 12 includes a processor 1210, and the processor 1210 may call and execute a computer program from a memory to implement the methods in the embodiments of the present application.

Optionally, as shown in fig. 12, the apparatus 1200 may further include a memory 1220. Wherein the processor 1210 may call and run computer programs from the memory 1220 to implement the methods in embodiments of the present application.

The memory 1220 may be a separate device from the processor 1210, or may be integrated into the processor 1210.

Optionally, the apparatus 1200 may also include an input interface 1230. Wherein the processor 1210 may control the input interface 1230 to communicate with other devices or chips, and in particular, may obtain information or data sent by other devices or chips.

Optionally, the apparatus 1200 may further include an output interface 1240. Wherein processor 1210 may control the output interface 1240 to communicate with other devices or chips, and in particular may output information or data to other devices or chips.

Optionally, the apparatus may be applied to a network device in the embodiments of the present application, and the apparatus may implement a corresponding flow implemented by the network device in each method in the embodiments of the present application, which is not described herein for brevity.

Optionally, the apparatus may be applied to a terminal device in the embodiment of the present application, and the apparatus may implement a corresponding flow implemented by the terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

Alternatively, the device mentioned in the embodiments of the present application may also be a chip. For example, a system-on-chip or a system-on-chip, etc.

Fig. 13 is a schematic block diagram of a communication system 1300 provided in an embodiment of the present application. As shown in fig. 13, the communication system 1300 includes a terminal device 1310 and a network device 1320.

The terminal device 1310 may be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 1320 may be used to implement the corresponding functions implemented by the network device or the base station in the above method, which are not described herein for brevity.

It should be appreciated that the processor of an embodiment of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memory is exemplary but not limiting, and for example, the memory in the embodiments of the present application may be Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct RAM (DR RAM), and the like. That is, the memory in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

Embodiments of the present application also provide a computer-readable storage medium for storing a computer program.

Optionally, the computer readable storage medium may be applied to a network device or a base station in the embodiments of the present application, and the computer program causes a computer to execute a corresponding flow implemented by the network device or the base station in each method of the embodiments of the present application, which is not described herein for brevity.

Optionally, the computer readable storage medium may be applied to a mobile terminal/terminal device in the embodiments of the present application, and the computer program causes a computer to execute a corresponding procedure implemented by the mobile terminal/terminal device in each method of the embodiments of the present application, which is not described herein for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to a network device or a base station in the embodiments of the present application, and the computer program instructions cause a computer to execute corresponding flows implemented by the network device or the base station in the methods in the embodiments of the present application, which are not described herein for brevity.

Optionally, the computer program product may be applied to a mobile terminal/terminal device in the embodiments of the present application, and the computer program instructions cause a computer to execute corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiments of the present application, which are not described herein for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to a network device or a base station in the embodiments of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the network device or the base station in each method in the embodiments of the present application, which is not described herein for brevity.

Optionally, the computer program may be applied to a mobile terminal/terminal device in the embodiments of the present application, where the computer program when run on a computer causes the computer to execute corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiments of the present application, and for brevity, will not be described herein.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. For such understanding, the technical solutions of the present application may be embodied in essence or in a part contributing to the prior art or in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method for pre-compensating for timing advance in an NTN network, comprising:

receiving delay information of a feed link;

receiving indication information, wherein the indication information is used for indicating whether to perform Timing Advance (TA) precompensation based on the time delay information;

and in the random access process, TA precompensation is carried out according to the indication information.
The method of claim 1, wherein the step of determining the position of the substrate comprises,

if the reference point of the alignment of the uplink timing and the downlink timing of the terminal equipment is the network equipment, the indication information indicates TA pre-compensation based on the time delay information;

and if the reference point for aligning the uplink timing and the downlink timing of the terminal equipment is a satellite, the indication information indicates that TA precompensation is not carried out based on the time delay information.
A method according to claim 1 or 2, characterized in that the indication information is indicated for all terminal devices within the serving cell.
A method according to any of claims 1-3, characterized in that the indication information is carried in a system message or in radio resource control, RRC, dedicated signalling.
The method according to any one of claims 1-4, wherein the performing TA pre-compensation according to the indication information during random access includes:

and when the message Msg1 or MsgA is sent, TA precompensation is carried out according to the indication information.
The method according to any one of claims 1-5, wherein said TA precompensation according to said indication information comprises:

if the indication information indicates TA pre-compensation based on the time delay information, TA pre-compensation is performed according to the time delay information, the position information of the terminal equipment and the ephemeris information;

and if the indication information indicates that the TA pre-compensation is not performed based on the time delay information, performing the TA pre-compensation according to the position information and the ephemeris information of the terminal equipment.
A method for pre-compensating for timing advance in an NTN network, comprising:

transmitting delay information of a feed link;

and sending indication information, wherein the indication information is used for indicating whether TA precompensation is carried out based on the time delay information.
The method of claim 7, wherein the step of determining the position of the probe is performed,

if the reference point of the alignment of the uplink timing and the downlink timing of the terminal equipment is the network equipment, the indication information indicates TA pre-compensation based on the time delay information;

and if the reference point for aligning the uplink timing and the downlink timing of the terminal equipment is a satellite, the indication information indicates that TA precompensation is not carried out based on the time delay information.
A method according to claim 7 or 8, characterized in that the indication information is indicated for all terminal devices within the serving cell.
The method according to any of claims 7-9, wherein the indication information is carried in a system message or RRC dedicated signaling.
A terminal device, comprising:

the communication unit is used for receiving the time delay information of the feed link and indication information, wherein the indication information is used for indicating whether TA pre-compensation is carried out based on the time delay information;

and the processing unit is used for performing TA precompensation according to the indication information in the random access process.
The terminal device of claim 11, wherein the terminal device,

if the reference point of the alignment of the uplink timing and the downlink timing of the terminal equipment is the network equipment, the indication information indicates TA pre-compensation based on the time delay information;

And if the reference point for aligning the uplink timing and the downlink timing of the terminal equipment is a satellite, the indication information indicates that TA precompensation is not carried out based on the time delay information.
A terminal device according to claim 11 or 12, characterized in that the indication information is indicated for all terminal devices within the serving cell.
The terminal device according to any of the claims 11-13, characterized in that the indication information is carried in a system message or RRC dedicated signaling.
Terminal device according to any of the claims 11-14, characterized in that the processing unit is specifically configured to:

and when the Msg1 or the MsgA is transmitted, TA precompensation is carried out according to the indication information.
Terminal device according to any of the claims 11-15, characterized in that the processing unit is specifically configured to:

if the indication information indicates TA pre-compensation based on the time delay information, TA pre-compensation is performed according to the time delay information, the position information of the terminal equipment and the ephemeris information;

and if the indication information indicates that the TA pre-compensation is not performed based on the time delay information, performing the TA pre-compensation according to the position information and the ephemeris information of the terminal equipment.
A network device, comprising:

and the communication unit is used for sending the time delay information of the feed link and the indication information, wherein the indication information is used for indicating whether TA pre-compensation is carried out based on the time delay information.
The network device of claim 17, wherein the network device,

if the reference point of the alignment of the uplink timing and the downlink timing of the terminal equipment is the network equipment, the indication information indicates TA pre-compensation based on the time delay information;

and if the reference point for aligning the uplink timing and the downlink timing of the terminal equipment is a satellite, the indication information indicates that TA precompensation is not carried out based on the time delay information.
A network device according to claim 17 or 18, characterized in that the indication information is indicated for all terminal devices within the serving cell.
The network device according to any of claims 17-19, wherein the indication information is carried in a system message or RRC dedicated signaling.
A terminal device, comprising: a processor and a memory for storing a computer program, the processor being adapted to invoke and run the computer program stored in the memory, to perform the method according to any of claims 1 to 6.
A network device, comprising: a processor and a memory for storing a computer program, the processor being adapted to invoke and run the computer program stored in the memory, to perform the method according to any of claims 7 to 10.
An apparatus, comprising: a processor for calling and running a computer program from a memory, causing a device in which the apparatus is installed to perform the method according to any one of claims 1 to 6.
An apparatus, comprising: a processor for calling and running a computer program from a memory, causing a device in which the apparatus is installed to perform the method of any of claims 7 to 10.
A computer readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 1 to 6.
A computer readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 7 to 10.
A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 6.
A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 7 to 10.
A computer program, characterized in that the computer program causes a computer to perform the method according to any one of claims 1 to 6.
A computer program, characterized in that the computer program causes a computer to perform the method according to any one of claims 7 to 10.