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CN-122003929-A - Method for enhancing uplink transmission expansion in operation of global navigation satellite system

CN122003929ACN 122003929 ACN122003929 ACN 122003929ACN-122003929-A

Abstract

Various enhanced solutions for Uplink (UL) transmission extension in Global Navigation Satellite System (GNSS) operation are described. A device may be connected to a network node of a wireless network to be in a connected state for a GNSS active duration. The device may then determine to allow uplink transmissions for the extended duration. Specifically, the extended period begins when the GNSS active period expires.

Inventors

  • TANG WEN

Assignees

  • 联发科技（新加坡）私人有限公司

Dates

Publication Date
20260508
Application Date
20240925
Priority Date
20231025

Claims (20)

  1. 1. A method, comprising: Connecting, by a processor of the device, to a network node of the wireless network to be in a connected state during the period of the global navigation satellite system GNSS validity, and The processor determines to allow uplink UL transmissions for an extended period of time, wherein the extended period of time begins when the GNSS validity period expires.
  2. 2. The method as recited in claim 1, further comprising: a configuration of a length value is received from the network node by the processor, wherein the extended duration begins with the length value when the time alignment timer is configured to be non-time limited.
  3. 3. The method of claim 1, wherein the extended duration begins with a length value set as a remaining time of the time alignment timer when the time alignment timer is not configured to be infinite.
  4. 4. The method as recited in claim 1, further comprising: Receiving, by the processor, an indication from the network node to extend the UL transmission before the extended period expires, and The extended duration is extended by the time alignment timer remaining time under the indication when the time alignment timer is not configured to be unlimited.
  5. 5. The method of claim 4, wherein the indication comprises a timing advance command TAC in a medium access control, MAC, control element, CE.
  6. 6. The method as recited in claim 1, further comprising: Determining, by the processor, that an uplink transmission extension is in an active state for the extension period or that the uplink transmission extension is not in an active state when the extension period expires or is not configured, and And switching, by the processor, from the connected state to an idle state upon expiration of the GNSS location unless the uplink transmission extension is in an active state.
  7. 7. The method as recited in claim 1, further comprising: determining, by the processor, to trigger GNSS acquisition when the GNSS location expires and the GNSS acquisition is enabled in the connected state, and And switching, by the processor, from the connected state to an idle state upon expiration of the GNSS location unless the GNSS acquisition is triggered.
  8. 8. The method as recited in claim 1, further comprising: Determining, by the processor, that the uplink transmission is not allowed for the extended period of time when the apparatus has no valid ephemeris and common timing advance TA, and The method further includes determining, by the processor, that the uplink transmission is allowed for the extended period of time when the device has a valid ephemeris and a common TA.
  9. 9. The method as recited in claim 8, further comprising: Determining, by the processor, that the uplink transmission is not allowed after expiration of the GNSS active period when the extended period expires and the device has or does not have active ephemeris and a common TA, or Determining, by the processor, that the uplink transmission is not allowed after expiration of the GNSS active period when the extended period is not configured and the device has or does not have active ephemeris and a common TA, or Determining, by the processor, that the uplink transmission is allowed during the GNSS active period when the device has active ephemeris and a common TA, or The processor determines that the uplink transmission is not allowed during the GNSS active period when the device does not have active ephemeris and public TA.
  10. 10. The method as recited in claim 1, further comprising: Determining, by the processor, a timing advance, TA, for the uplink transmission for the extended period, wherein the determining of the TA includes at least one of: Determining a user equipment UE derived timing correction based on a GNSS position obtained prior to the extended duration trigger, and One or more adjustments of an n_ta value are applied for the physical random access channel PRACH or narrowband physical random access channel NPRACH transmission within the extended duration, where the n_ta value represents the number of TA adjustments.
  11. 11. The method of claim 10, wherein the GNSS position obtained prior to the extended period of time has expired during the extended period of time.
  12. 12. The method of claim 10 wherein said determining of said TA further comprises: and calculating the frequency Doppler shift of the service link, and pre-compensating the service link in the uplink transmission based on the GNSS position obtained before the extended duration triggering.
  13. 13. The method of claim 10 wherein the applying step of the one or more adjustments to the n_ta value further comprises: updating the N_TA value based on the one or more adjustments from the network node indicated by the timing advance command TAC, and It is determined not to reset the n_ta value to zero for the PRACH or NPRACH transmission.
  14. 14. The method of claim 10 wherein the applying step of the one or more adjustments to the TA value further comprises: updating a cumulative offset based on the one or more adjustments indicated by the TAC from the network node, wherein the cumulative offset is set to zero at the beginning of the extended period of time, and The n_ta value is reset to zero for the PRACH or NPRACH transmission.
  15. 15. The method of claim 10 wherein the applying step of the one or more adjustments to the TA value further comprises: Updating the N_TA value based on the one or more adjustments from the network node indicated by TAC, and The accumulated offset is set to an n_ta offset value prior to resetting the n_ta value to zero for the PRACH or NPRACH transmission, wherein the n_ta offset value is set to zero at the beginning of the extension period.
  16. 16. A method, comprising: Connecting, by a processor of the network node, with the device to allow the device to be in a connected state for the duration of the GNSS active period, and An uplink UL transmission is received by the processor from the apparatus for an extended period of time, wherein the extended period of time begins when the GNSS validity period expires.
  17. 17. The method as recited in claim 16, further comprising: And transmitting, by the processor, a configuration of a length value to the apparatus, wherein the extended duration begins with the length value when the time alignment timer is configured to be infinite.
  18. 18. The method of claim 16, wherein the extended duration begins with a length value set as a remaining time of the time alignment timer when the time alignment timer is not configured to be infinite.
  19. 19. The method as recited in claim 16, further comprising: Transmitting, by the processor, an indication to the apparatus to extend the uplink transmission before the expiration of the extension period, and The extended duration is extended by the processor with a time alignment timer remaining time under the indication if the time alignment timer is not configured to be infinite.
  20. 20. The method of claim 19, wherein the indication comprises a timing advance command TAC in a medium access control, MAC, control element, CE.

Description

Method for enhancing uplink transmission expansion in operation of global navigation satellite system Cross reference The present invention is part of a non-provisional application requiring priority benefits, PCT application number PCT/CN2023/126533, with a filing date of 2023, 10, 25, which is incorporated herein by reference. Technical Field The present invention relates generally to mobile communications and, more particularly, to enhancement of Uplink (UL) transmission extensions in global navigation satellite system (global navigation SATELLITE SYSTEM, GNSS) operation. Background Unless otherwise indicated, the approaches described in this section are not prior art to the claims in this section and are not admitted to be prior art by inclusion in this section. In release 17 of the third generation partnership project (Generation Partnership Project, 3 GPP), non-terrestrial networks (non-TERRESTRIAL NETWORK, NTN) were introduced as a terminal-satellite direct communication technology based on a New Radio (NR) interface. With the convergence of satellite networks with terrestrial cellular networks (e.g., fifth generation (5G) networks), NTNs can provide ubiquitous coverage that is not limited by topography and topography. With the continued evolution of NTN in the 5G-Advanced stage, NTN has become an important component of the 3GPP release 18 working plan. Currently, NTNs may include two working groups, internet of things (IoT-Things, for short), NTN and New Radio (NR) NTN. IoT NTN focuses on satellite IoT services supporting low complexity enhanced machine type communications (ENHANCED MACHINE-type communication, eMTC for short) and narrowband internet of things (narrowband Internet-of-things, NB-IoT) user equipment (UE for short). The NR NTN adopts a 5G NR framework to realize direct connection between the satellite and the smart phone so as to provide voice and data services. In scenarios with large transmission delays, such as IoT NTN, to ensure proper system operation, the UE may need efficient global navigation satellite system (global navigation SATELLITE SYSTEM, abbreviated GNSS) position correction for time and frequency synchronization. According to the current release 17 standard of 3GPP, performing GNSS position fixes requires that the UE has an active GNSS fix before entering a radio resource control (radio resource control, abbreviated as RRC) CONNECTED state (also called rrc_connected mode), and when the GNSS fix expires in the RRC CONNECTED state, the UE enters an RRC IDLE state (also called rrc_idle mode). However, this design is not feasible for UEs that may have long Uplink (UL) transmissions, because additional re-access to the network is required, which has costs in terms of signaling overhead and delay. Therefore, it is necessary to provide an appropriate solution to this problem. Disclosure of Invention The following summary is provided for illustration only and is not intended to be limiting in any way. That is, the following summary is intended to introduce a selection of concepts, emphasis, benefits, and advantages of the novel and non-obvious techniques described herein. The specific embodiments will be further described in the detailed description that follows. Accordingly, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended to be used to determine the scope of the claimed subject matter. It is an object of the present disclosure to propose solutions, concepts, designs, systems, methods and devices related to Uplink (UL) transmission extension enhancements in global navigation satellite system (global navigation SATELLITE SYSTEM, GNSS) operation. It is believed that the foregoing problems can be avoided or alleviated by the practice of one or more aspects set forth herein. In one aspect, a method may involve a device connecting to a network node of a wireless network to be in a connected state for a period of GNSS validity. The method may also involve the apparatus determining to allow uplink transmissions for an extended period of time, wherein the extended period of time begins when the GNSS active period expires. In one aspect, a method may involve a network node interfacing with a device to allow the device to be in an attached state during a GNSS active period. The method may also involve the network node receiving an uplink transmission from the apparatus for an extended period of time, wherein the extended period of time begins when the GNSS validity period expires. Notably, while the description herein may be in the context of certain radio access technologies, networks and network topologies (e.g., long Term Evolution (LTE), LTE-Advanced Pro, fifth generation (5G), new Radio (NR), internet of things (IoT) and narrowband internet of things (NB-IoT), industrial internet of things (IIoT), super 5G (B5G), and sixth generation (6G)), the proposed concepts, schemes, and any variants or derivatives thereof m