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CN-122002518-A - Relaxation of gradual timing adjustment requirements for non-terrestrial networks

CN122002518ACN 122002518 ACN122002518 ACN 122002518ACN-122002518-A

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 satisfies a predefined condition for high speed. Based on the speed of the apparatus meeting a predefined condition for high speed and based on the type of the apparatus matching one of the one or more predefined types, the apparatus enables use of an increased or unrestricted maximum aggregate adjustment rate for uplink transmission timing at the apparatus.

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 Based on the speed of the device meeting the predefined condition for high speed, and based on the type of the device matching one of one or more predefined types, enabling use of an increased or unrestricted maximum aggregate adjustment rate for uplink transmission timing at the device.
  2. 2. The apparatus of claim 1, wherein the one or more predefined types comprise one or more types corresponding to a mobile very small aperture terminal, VSAT, or Wherein the one or more predefined types include non-terrestrial network NTN VSAT type 4 and/or NTN VSAT type 5.
  3. 3. The device of claim 1 or 2, 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.
  4. 4. 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: Determining the speed of the device based on at least one of: one or more global navigation satellite system GNSS based measurements, -One or more doppler shift measurements, or -Measuring using one or more sensors of an inertial measurement unit comprised in the device, and Wherein the speed of the device corresponds to a speed of the device relative to the access node or other reference location.
  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: A configuration signal is received from an access node, the configuration signal 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 at least on a determination that the speed of the apparatus satisfies the predefined condition for high speed and that the type of the apparatus matches one of the one or more predefined types.
  6. 6. 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 meeting the predefined condition for high speed and the type of the apparatus matching one of one or more predefined types, wherein the increased maximum aggregate adjustment rate is greater than a predefined maximum aggregate adjustment rate for the uplink transmission timing.
  7. 7. The apparatus of claim 1 or 2, wherein the increased maximum aggregate adjustment rate for the uplink transmission timing is a maximum aggregate adjustment rate for the uplink transmission timing that does not include any adjustment due to a change in an apparatus control component of the timing advance due to a location update of an access node based on a serving satellite, and any adjustment due to a change in a network control component of the timing advance during a predefined past time interval.
  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, 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, and 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.
  9. 9. The apparatus of claim 8, wherein determining whether the speed of the apparatus satisfies 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 fails to exceed or 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 a predefined amount of time is below a second predefined average speed threshold, wherein the second predefined average speed threshold is below the first predefined average speed threshold.
  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: Transmitting a configuration signal to a terminal device, the configuration signal being for configuring 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 a speed of the terminal device meets a predefined condition for high speed and that a type of the terminal device matches any of one or more predefined types.

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