CN-122002519-A - Relaxation of gradual timing adjustment requirements for non-terrestrial networks

Abstract

The present disclosure relates to relaxation of gradual timing adjustment requirements for non-terrestrial networks. According to one aspect, an apparatus configured to perform the following is provided. The apparatus receives a timing advance command from an access node of a non-terrestrial network. The apparatus determines whether a speed of the apparatus device satisfies a predefined condition for high speed. The apparatus enables use of an increased or unrestricted maximum aggregate adjustment rate for uplink transmission timing at the apparatus based at least on the apparatus's speed meeting a predefined condition for high speed.

Inventors

• R. Medeiros De Amorim

Assignees

• 诺基亚技术有限公司

Dates

Publication Date

20260508

Application Date

20251107

Priority Date

20241108

Claims (10)

1. 1. An apparatus for communication, comprising: At least one processor, and At least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: Receiving a timing advance command from an access node of a non-terrestrial network; determining whether the speed of the device meets a predefined condition for high speed, and The use of an increased or unrestricted maximum aggregate adjustment rate is enabled for uplink transmission timing at the device based at least on the speed of the device satisfying the predefined condition for high speed.
2. 2. The device of claim 1, wherein determining whether the speed of the device meets the predefined condition for high speed comprises: determining whether the speed of the device exceeds a predefined speed threshold for a predefined amount of time, or It is determined whether the speed of the device averaged over a predefined amount of time exceeds a predefined average speed threshold.
3. 3. The apparatus of claim 1 or 2, wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus to perform, after the enabling of the use of the increased or unrestricted maximum aggregate adjustment rate: determining whether the speed of the device meets a predefined condition for a reduced speed; the use of the increased or unrestricted maximum aggregate adjustment rate is disabled for the uplink transmission timing at the device based on the speed of the device satisfying the predefined condition for reduced speed.
4. 4. The device of claim 3, wherein determining whether the speed of the device meets the predefined condition for high speed comprises one or more of: Determining whether the speed of the device exceeds a first predefined speed threshold for a predefined amount of time, and wherein determining whether the speed of the device meets the predefined condition for reduced speed comprises determining whether the speed of the device fails to exceed a second predefined speed threshold for the predefined amount of time, wherein the second predefined speed threshold is equal to or lower than the first predefined speed threshold, or determining whether the speed of the device is lower than a second predefined speed threshold for the predefined amount of time, wherein the second predefined speed threshold is equal to or lower than the first predefined speed threshold, or Determining whether the speed of the device averaged over a predefined amount of time exceeds a first predefined average speed threshold, and wherein determining whether the speed of the device meets the predefined condition for reduced speed comprises determining whether the speed of the device averaged over the predefined amount of time is below a second predefined average speed threshold, wherein the second predefined average speed threshold is equal to or below the first predefined average speed threshold.
5. 5. The apparatus of claim 1 or 2, wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus to perform the enabling of the use of the increased maximum aggregate adjustment rate for the uplink transmission timing at the apparatus based on the speed of the apparatus satisfying the predefined condition for high speed, wherein the increased maximum aggregate adjustment rate is greater than a predefined default maximum aggregate adjustment rate.
6. 6. The apparatus of claim 5, wherein each of the increased maximum aggregate adjustment rate for the uplink transmission timing and the predefined default maximum aggregate adjustment rate for the uplink transmission timing is defined as a maximum aggregate adjustment rate for the uplink transmission timing that does not include any adjustments in apparatus control components of timing advance due to position updates of an access node based on a serving satellite, and any changes in network control components of the timing advance, during a predefined past time interval, and Wherein the increased maximum aggregate adjustment rate has a predefined value or has a value that depends on at least one of the speed of the device, the acceleration of the device, or the capability of the device.
7. 7. The apparatus of claim 1 or 2, wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus to perform the enabling of the use of the unrestricted maximum aggregate adjustment rate for the uplink transmission timing at the apparatus based on the speed of the apparatus satisfying the predefined condition for high speed, wherein the unrestricted maximum aggregate adjustment rate is applicable at least to adjustment of the uplink transmission timing in connection with a change in location of the apparatus.
8. 8. The apparatus of claim 1 or 2, wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus to perform: A configuration message is received from an access node, the configuration message for configuring the apparatus to enable the use of the increased or unrestricted maximum aggregate adjustment rate for the uplink transmission timing at the apparatus based on determining that the speed of the apparatus meets the predefined condition for high speed.
9. 9. The apparatus of claim 1 or 2, wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus to perform: performing a stepwise adjustment of the uplink transmission timing using the increased or unrestricted maximum aggregate adjustment rate, an Wherein the at least one memory and the instructions are configured to, with the at least one processor, cause the apparatus to perform: an uplink transmission is transmitted to the access node of the non-terrestrial network, the uplink transmission applying the adjusted uplink transmission timing.
10. 10. An apparatus for communication, comprising: At least one processor, and At least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: A configuration message is sent to a terminal device, the configuration message being used to configure the terminal device to enable use of an increased or unrestricted maximum aggregate adjustment rate for uplink transmission timing at the terminal device based on determining that the speed of the terminal device meets a predefined condition for high speed.

Description

Relaxation of gradual timing adjustment requirements for non-terrestrial networks Technical Field Various example embodiments relate to wireless communications. Background A non-terrestrial network (NTN) is a wireless communication network that utilizes an antenna-based or on-board access node to provide connectivity for terminal devices (rather than relying solely on a terrestrial access node). The space-based or airborne access nodes may include, for example, satellites and/or High Altitude Platforms (HAPs) on various orbits, such as balloons, airships, and drones. Like many other wireless communication networks, terminal devices in NTNs employ so-called Timing Advances (TAs) in order to synchronize their transmissions to the access node and thereby avoid interference. That is, the TA applied at the terminal device is used to adjust the transmission time of the terminal device. However, implementing timing advance functionality in NTN is challenging due to the long distance between the terminal device and the access node, particularly the faster speed of satellite-based access nodes. Disclosure of Invention According to one aspect, the subject matter of the independent claims is provided. Embodiments are defined in the dependent claims. According to a first aspect, there is provided a method comprising: Receiving a timing advance command from an access node of a non-terrestrial network; determining whether the speed of the device meets a predefined condition for high speed, and The use of an increased or unrestricted maximum aggregate adjustment rate is enabled for uplink transmission timing at the apparatus based at least on the speed of the apparatus meeting predefined conditions for high speed. According to a first embodiment of the first aspect, determining whether the speed of the device meets a predefined condition for high speed comprises: It is determined whether the speed of the device exceeds a predefined speed threshold for a predefined amount of time. According to a second embodiment of the first aspect, determining whether the speed of the device meets a predefined condition for high speed comprises: it is determined whether the speed of the device averaged over a predefined amount of time exceeds a predefined average speed threshold. According to a third embodiment of the first aspect, the method further comprises performing, after the enabling of the use of the increased or unrestricted maximum aggregate adjustment rate, Determining whether the speed of the device meets a predefined condition for a reduced speed (lowered speed); the use of an increased or unrestricted maximum aggregate adjustment rate is disabled for uplink transmission timing at the apparatus based on the speed of the apparatus meeting a predefined condition for reduced speed. According to a fourth embodiment of the first aspect, determining whether the speed of the device meets a predefined condition for high speed comprises: determining whether the speed of the device exceeds a first predefined speed threshold for a predefined amount of time, an Wherein determining whether the speed of the device meets the predefined condition for reduced speed comprises: determining whether the speed of the device fails to exceed a second predefined speed threshold for a predefined amount of time, wherein the second predefined speed threshold is equal to or lower than the first predefined speed threshold, or It is determined whether the speed of the device is below a second predefined speed threshold for a predefined amount of time, wherein the second predefined speed threshold is equal to or below the first predefined speed threshold. According to a fifth embodiment of the first aspect, determining whether the speed of the device meets a predefined condition for high speed comprises: determining whether the speed of the device averaged over a predefined amount of time exceeds a first predefined average speed threshold, and Wherein determining whether the speed of the device meets the predefined condition for reduced speed comprises: A determination is made as to whether the speed of the device averaged over a predefined amount of time is below a second predefined average speed threshold, wherein the second predefined average speed threshold is equal to or below the first predefined average speed threshold. According to a sixth embodiment of the first aspect, the method comprises performing, based on the speed of the apparatus satisfying a predefined condition for high speed, enabling use of an increased maximum aggregate adjustment rate for uplink transmission timing at the apparatus, wherein the increased maximum aggregate adjustment rate is greater than a predefined default maximum aggregate adjustment rate. According to a seventh embodiment further defining the first aspect of the sixth embodiment, each of the increased maximum aggregate adjustment rate for uplink transmission timing and the predefined default maximum aggregate adju