US-12628105-B2 - Method for window offset determination and terminal

US12628105B2US 12628105 B2US12628105 B2US 12628105B2US-12628105-B2

Abstract

Provided are a method for window offset determination and a terminal, which are applied to a NTN communication system. The NTN communication system comprises a terminal and a network device. The method includes the following. The terminal acquires the first configuration information from the network device and determines a current window offset according to the first configuration information. The current window offset is used to represent an offset of a starting position of a downlink search space window corresponding to a current pre-configured uplink resource relative to a starting time, furthermore, the starting time is the end position of the current pre-configured uplink resource.

Inventors

Zhenzhu LEI
Sicong Zhao
Huayu Zhou

Assignees

SPREADTRUM SEMICONDUCTOR (NANJING) CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20211123
Priority Date: 20201207

Claims (17)

1 . A method for window offset determination, applied to a terminal in a non-terrestrial network (NTN) communication system, wherein the NTN communication system comprises the terminal and a network device, and the method comprises: acquiring first configuration information from the network device; and determining a current window offset according to the first configuration information, wherein the current window offset is used to represent an offset of a starting position of a downlink search space window corresponding to a current pre-configured uplink resource relative to a starting time, and the starting time is an end position of the current pre-configured uplink resource, wherein the first configuration information comprises one of: initial value index information and effect-delay information, first mapping relationship information, a current common timing advance, or a current common timing advance change rate, and the first mapping relationship information is indicative of a mapping relationship between a propagation distance from the terminal to a satellite in the NTN communication system and a window offset.
2 . The method of claim 1 , wherein the first configuration information is indicated by at least one of radio resource control (RRC) dedicated signaling, a media access control control-element (MAC CE), and system broadcast information.
3 . The method of claim 1 , wherein the current common timing advance is used for determining the current window offset from second mapping relationship information, wherein the second mapping relationship information is configured by the network device; the current common timing advance change rate is used for determining the current common timing advance; and the second mapping relationship information is indicative of a mapping relationship between the common timing advance and a window offset.
4 . The method of claim 3 , wherein if the first configuration information comprises the current common timing advance or the current common timing advance change rate, before acquiring the first configuration information from the network device, the method further comprises: acquiring the second mapping relationship information from the network device.
5 . The method of claim 4 , wherein the second mapping relationship information is indicated by system broadcast information or RRC dedicated signaling.
6 . The method of claim 4 , wherein determining the current window offset according to the first configuration information comprises: determining the current window offset from the second mapping relationship information according to the current common timing advance; or determining the current common timing advance according to the current common timing advance change rate, and determining the current window offset from the second mapping relationship information according to the current common timing advance.
7 . The method of claim 1 , wherein the initial value index information is used for determining a target value in value list information, and the value list information is configured by the network device, and wherein the effect-delay information is indicative of a delay for the terminal to take the target value as the current window offset; and the value list information is indicative of a list containing a plurality of window offsets in sequence.
8 . The method of claim 7 , wherein the value list information satisfies at least one of the following modes: values in the value list information are determined by a propagation distance between the terminal and the satellite in the NTN communication system; and an order of the values in the value list information corresponds to a movement position of the satellite.
9 . A terminal in a non-terrestrial network (NTN) communication system, comprising: a memory storing computer readable programs; a transceiver; a processor configured to invoke the computer readable programs to: cause the transceiver to acquire first configuration information from a network device in the NTN communication system; and determine a current window offset according to the first configuration information, wherein the current window offset is used to represent an offset of a starting position of a downlink search space window corresponding to a current pre-configured uplink resource relative to a starting time, and the starting time is an end position of the current pre-configured uplink resource, wherein the first configuration information comprises one of: initial value index information and effect-delay information, first mapping relationship information, a current common timing advance, or a current common timing advance change rate, and the first mapping relationship information is indicative of a mapping relationship between a propagation distance from the terminal to a satellite in the NTN communication system and a window offset.
10 . The terminal of claim 9 , wherein the first configuration information is indicated by at least one of radio resource control (RRC) dedicated signaling, a media access control control-element (MAC CE), and system broadcast information.
11 . The terminal of claim 9 , wherein the current common timing advance is used for determining the current window offset from second mapping relationship information, wherein the second mapping relationship information is configured by the network device; the current common timing advance change rate is used for determining the current common timing advance; and the second mapping relationship information is indicative of a mapping relationship between the common timing advance and a window offset.
12 . The terminal of claim 11 , wherein if the first configuration information comprises the current common timing advance or the current common timing advance change rate, before acquiring the first configuration information from the network device, the processing unit is further configured to: acquire the second mapping relationship information from the network device.
13 . The terminal of claim 12 , wherein the second mapping relationship information is indicated by system broadcast information or RRC dedicated signaling.
14 . The terminal of claim 12 , wherein in terms of determining the current window offset according to the first configuration information, the processing unit is configured to: determine the current window offset from the second mapping relationship information according to the current common timing advance; or determine the current common timing advance according to the current common timing advance change rate, and determine the current window offset from the second mapping relationship information according to the current common timing advance.
15 . The terminal of claim 9 , wherein the initial value index information is used for determining a target value in value list information, and the value list information is configured by the network, and wherein the effect-delay information is indicative of a delay for the terminal to take the target value as the current window offset; and the value list information is indicative of a list composed of a plurality of window offsets in sequence.
16 . The terminal of claim 15 , wherein the value list information satisfies at least one of the following modes: values in the value list information are determined by a propagation distance between the terminal and the satellite in the NTN communication system; and an order of the values in the value list information corresponds to a movement position of the satellite.
17 . A non-transitory computer readable storage medium, storing a computer program for exchanging electronic data, wherein the computer program causes a computer to: acquire first configuration information from the network device; and determine a current window offset according to the first configuration information, wherein the current window offset is used to represent an offset of a starting position of a downlink search space window corresponding to a current pre-configured uplink resource relative to a starting time, and the starting time is an end position of the current pre-configured uplink resource, wherein the first configuration information comprises one of: initial value index information and effect-delay information, first mapping relationship information, a current common timing advance, or a current common timing advance change rate, and the first mapping relationship information is indicative of a mapping relationship between a propagation distance from the terminal to a satellite in the NTN communication system and a window offset.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is a National Stage of International Application No. PCT/CN2021/132472, field Nov. 23, 2021, which claims priority to Chinese Patent Application No. 2020114214622, filed Dec. 7, 2020, the entire disclosures of which are hereby incorporated by reference. TECHNICAL FIELD The disclosure relates to the field of communications technologies, and in particular, to a method for window offset determination and a terminal. BACKGROUND Currently, the 3rd generation partnership project (3GPP) is developing a protocol standard for non-terrestrial network (NTN) communication, where the protocol standard mainly relates to a spaceborne vehicle or an airborne vehicle, for example, a synchronous earth orbiting satellite, a near earth orbiting satellite, a high elliptical orbit satellite, and a high-altitude platform station (HAPS). Compared with a terrestrial network communication system, a satellite in an NTN communication system generally generates a beam on the ground, or referred to as a beam footprint or a cell, and the satellite continuously moves along a fixed orbit, so that a propagation distance (or propagation delay) between a terminal located in the described beam or cell and the satellite changes continuously with a change in position of the satellite. As a result, the duration (namely, offset) of delay in starting time of a downlink search space window (PUR SS Window) corresponding to a pre-configured uplink resource (PUR) changes constantly. In this case, how to determine the offset for each starting position of the PUR SS Window needs further investigation. SUMMARY In a first aspect, a method for window offset determination is provided in an embodiment of the present disclosure, which is applied to a terminal in a non-terrestrial network (NTN) communication system, the NTN communication system includes the terminal and a network device. The method includes the following. Acquire first configuration information from the network device. Determine a current window offset according to the first configuration information, where the current window offset is used to represent an offset of a starting position of a downlink search space window corresponding to a current pre-configured uplink resource relative to a starting time, and the starting time is an end position of the current pre-configured uplink resource. In a second aspect, a terminal in an NTN communication system is provided. The terminal includes a memory configured to store computer readable programs, a processor, and a transceiver. The processor is configured to invoke the computer readable programs to: cause the transceiver to acquire, through the communication unit, first configuration information from the network device; and determine a current window offset according to the first configuration information, where the current window offset is used to represent an offset of a starting position of a downlink search space window corresponding to a current pre-configured uplink resource relative to a starting time, and the starting time is an end position of the current pre-configured uplink resource. In a third aspect, a non-transitory computer readable storage medium is provided in an embodiment of the disclosure, where the computer readable storage medium stores a computer program for exchanging electronic data, and the computer program enables a computer to execute part or all of the steps described in any method in the first aspect. Starting Position BRIEF DESCRIPTION OF THE DRAWINGS To describe the technical solutions in embodiments of the disclosure more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show merely some embodiments of the disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is an architecture diagram of a non-terrestrial network (NTN) communication system according to an embodiment of the disclosure. FIG. 2 is a schematic diagram of an architecture with a transparent satellite communication system according to an embodiment of the present disclosure. FIG. 3 is a schematic structural diagram illustrating received signal quality comparison between a land-based network communication system and a NTN communication system according to an embodiment of the disclosure. FIG. 4 is a schematic structural diagram of an earth-fixed beam scenario of an NTN communication system according to an embodiment of the disclosure. FIG. 5 is an architecture diagram of architecture comparison of an NTN communication system according to an embodiment of the disclosure. FIG. 6 is a schematic structural diagram of an offset of a downlink search space window corresponding to a pre-configured uplink resource according to an embodiment of the disclosure. FIG. 7 is a