CN-122029901-A - Autonomous timing advance adjustment

Abstract

Techniques for wireless communication are disclosed. Aspects of the present disclosure relate to a UE in an RRC non-connected state performing an evaluation of autonomous timing advance adjustment criteria to determine whether to adjust a timing advance associated with a cell. In a further aspect, some or all of the set of autonomous timing advance adjustment criteria may be network configured. In a further aspect, a network component can obtain historical data comprising a history of autonomous timing advance adjustments and associated measurement metrics performed by UEs in an RRC non-connected state. Such aspects may provide various technical advantages, particularly avoiding TA zeroing that may otherwise occur as a UE moves through a cell, which in turn may improve UL timing for UL signaling in RCC non-connected states.

Inventors

• A. Manolax
• M. KUMAR
• V. Ramaswamy
• C. Kabula Mercade
• S. Akalakalan

Assignees

• 高通股份有限公司

Dates

Publication Date

20260512

Application Date

20240912

Priority Date

20231020

Claims (20)

1. 1. A method performed by a User Equipment (UE), the method comprising: During a Radio Resource Control (RRC) non-connected state, performing a cell selection procedure or a cell reselection procedure to camp on a cell; While camping on the cell, an evaluation of an autonomous set of timing advance adjustment criteria is performed to determine whether to adjust a timing advance associated with the cell, Wherein the set of autonomous timing advance adjustment criteria includes a time difference threshold between a first downlink reference time and a second downlink reference time associated with the evaluation, or Wherein the set of autonomous timing advance adjustment criteria includes a threshold of RSRP variation between a first Reference Signal Received Power (RSRP) and a second RSRP associated with the evaluation, or A combination thereof, and During the RRC non-connected state, uplink signals are transmitted based on the selectively adjusted timing advance, Wherein the selectively adjusted timing advance is selectively adjusted via one or more autonomous timing advance adjustments based on the evaluation.
2. 2. The method of claim 1, wherein the set of autonomous timing advance adjustment criteria comprises a minimum timing advance value.
3. 3. The method of claim 2, the method further comprising: Determining that the timing advance is less than the minimum timing advance value, and In response to the determination: invalidating the timing advance, or Setting the timing advance to the minimum timing advance value, or Autonomous timing advance adjustment to the timing advance is stopped without invalidating the timing advance.
4. 4. The method of claim 1, wherein the RRC non-connected state corresponds to an rrc_inactive state or an rrc_idle state.
5. 5. A method according to claim 3, the method further comprising: When the UE is in an rrc_connected state, historical data is sent to a network component, the historical data including a history of autonomous timing advance adjustments performed based on the evaluation and one or more associated measurement metrics.
6. 6. The method of claim 5, the method further comprising: A machine learning model is trained by inputting the historical data as training data, the machine learning model outputting autonomous timing advance adjustment decisions, autonomous timing advance adjustments, or both.
7. 7. The method of claim 1, wherein the evaluation corresponds to one of a plurality of periodic evaluations.
8. 8. The method of claim 7, wherein the periodicity of the multiple periodicity evaluations is based on: discontinuous Reception (DRX) periodicity associated with the UE, or Mobility associated with the UE, or Predefined periodicity, or Periodicity of network configuration.
9. 9. The method according to claim 7, Wherein the set of autonomous timing advance adjustment criteria includes the time difference threshold, or Wherein the second downlink reference time is associated with a most recent periodicity evaluation prior to the current periodicity evaluation, or Wherein the second downlink reference time is associated with a most recent periodic assessment prior to the current periodic assessment that resulted in an autonomous timing advance adjustment to the timing advance, or Wherein the second downlink reference time is associated with a respective downlink reference time during the cell selection procedure or the cell reselection procedure, or Wherein the selectively adjusted timing advance is autonomously adjusted for each periodic evaluation that satisfies at least one criterion of the set of autonomous timing advance adjustment criteria.
10. 10. The method of claim 7, wherein the set of autonomous timing advance adjustment criteria includes the RSRP change threshold, or Wherein the second RSRP is associated with a most recent periodic assessment prior to the current periodic assessment, or Wherein the second RSRP is associated with a most recent periodic assessment prior to the current periodic assessment that resulted in an autonomous timing advance adjustment to the timing advance, or Wherein the second RSRP is associated with a respective RSRP during the cell selection procedure or the cell reselection procedure, or Wherein for a given periodic assessment, an RSRP variation difference between the first RSRP and the second RSRP exceeds the RSRP variation threshold, and for the given periodic assessment, the selectively adjusted timing advance is adjusted according to an adjustment amount as a function of the RSRP variation difference.
11. 11. The method of claim 1, wherein a time difference between the first downlink reference time and the second downlink reference time exceeds the time difference threshold, and the selectively adjusted timing advance is adjusted according to an adjustment amount as a function of the time difference.
12. 12. The method according to claim 1, Wherein the evaluation is performed when a distance between the UE and a cell boundary of the cell is greater than a distance threshold, and Wherein when the distance between the UE and the cell boundary of the cell is not greater than a distance threshold, a different autonomous timing advance adjustment scheme is implemented.
13. 13. The method of claim 1, the method further comprising: An indication of at least one autonomous timing advance adjustment capability of the UE is sent to a network component.
14. 14. The method of claim 13, wherein the at least one autonomous timing advance adjustment capability comprises: supporting intra-cell autonomous timing advance adjustment, or Supporting autonomous timing advance adjustment based on Reference Signal Received Power (RSRP) variation, or Supporting autonomous timing advance adjustment based on RSRP range variation, or Supporting autonomous timing advance adjustment based on downlink reference time variation, or Any combination thereof.
15. 15. The method of claim 13, wherein at least one criterion associated with the set of autonomous timing advance adjustment criteria is configured based on the at least one autonomous timing advance adjustment capability.
16. 16. The method of claim 1, wherein the set of autonomous timing advance adjustment criteria comprises a maximum number of autonomous timing advance adjustments.
17. 17. The method of claim 16, wherein the set of maximum number of autonomous timing advance adjustments comprises: first maximum number of intra-cell autonomous timing advance adjustments, or A second maximum number of autonomous timing advance adjustments based on cell reselection, or A third maximum number of total autonomous timing advance adjustments, or Any combination thereof.
18. 18. The method of claim 17, the method further comprising: Determining at least one maximum number of autonomous timing advance adjustments up to the set of maximum numbers, and In response to the determination: invalidating the timing advance, or Setting the timing advance to a maximum timing advance value, or Autonomous timing advance adjustment to the timing advance is stopped without invalidating the timing advance.
19. 19. The method of claim 1, the method further comprising: Performing cell reselection to another cell, and In response to the cell reselection to the other cell, performing another selective adjustment on the selectively adjusted timing advance based on a difference between a first downlink transmit power associated with the cell and a second transmit power associated with the other cell.
20. 20. The method of claim 1, wherein the uplink signal corresponds to a Sounding Reference Signal (SRS) for Multiple Input Multiple Output (MIMO), an SRS for positioning, a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), or a demodulation reference signal (DMRS).

Description

Autonomous timing advance adjustment Cross Reference to Related Applications This patent application claims priority from indian patent application No. 202321071713, entitled "AUTONOMOUS timing advance TIMING ADVANCE ADJUSTMENTS," filed on 10 months 20 of 2023, which is assigned to the assignee of the present application and expressly incorporated herein by reference in its entirety. Background 1. Technical field Aspects of the present disclosure relate generally to wireless technology. 2. Description of related Art Wireless communication systems have evolved over many generations including first generation analog radiotelephone services (1G), second generation (2G) digital radiotelephone services (including transitional 2.5G and 2.75G networks), third generation (3G) high speed data, internet-capable wireless services, and fourth generation (4G) services (e.g., long Term Evolution (LTE) or WiMax). Many different types of wireless communication systems are currently in use, including cellular systems and Personal Communication Services (PCS) systems. Examples of known cellular systems include the cellular analog Advanced Mobile Phone System (AMPS), as well as digital cellular systems based on Code Division Multiple Access (CDMA), frequency Division Multiple Access (FDMA), time Division Multiple Access (TDMA), global system for mobile communications (GSM), and the like. The fifth generation (5G) wireless standard, known as New Radio (NR), achieves higher data transfer speeds, a greater number of connections, and better coverage, among other improvements. According to the next generation mobile network alliance, the 5G standard is designed to provide higher data rates, more accurate positioning (e.g., based on positioning reference signals (RS-P), such as downlink, uplink or sidelink Positioning Reference Signals (PRS)), and other technical enhancements than the previous standard. These enhancements and use of higher frequency bands, advances in PRS procedures and techniques, and high density deployment of 5G enable high accuracy positioning based on 5G. Disclosure of Invention The following presents a simplified summary in relation to one or more aspects disclosed herein. Accordingly, the following summary is not to be considered an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all contemplated aspects nor delineate the scope associated with any particular aspect. Accordingly, the sole purpose of the summary is to present some concepts related to one or more aspects related to the mechanisms disclosed herein in a simplified form prior to the detailed description that is presented below. In an aspect, a method performed by a User Equipment (UE) includes performing a cell selection procedure or a cell reselection procedure to camp on a cell during a Radio Resource Control (RRC) non-connected state, performing an evaluation of a set of autonomous timing advance adjustment criteria to determine whether to adjust a timing advance associated with the cell when camping on the cell, wherein the set of autonomous timing advance adjustment criteria includes a time difference threshold between a first downlink reference time and a second downlink reference time associated with the evaluation, or wherein the set of autonomous timing advance adjustment criteria includes an RSRP change threshold between a first Reference Signal Received Power (RSRP) and a second RSRP associated with the evaluation, or a combination thereof, and transmitting an uplink signal during the RRC non-connected state based on a selectively adjusted timing advance, wherein the selectively adjusted timing advance is selectively adjusted via one or more autonomous timing advances based on the evaluation. In an aspect, a method performed by a network component includes receiving an indication of at least one autonomous timing advance adjustment capability of a User Equipment (UE) in a Radio Resource Control (RRC) non-connected state, determining at least one autonomous timing advance adjustment criterion based on the at least one autonomous timing advance adjustment capability, and transmitting an indication of the at least one autonomous timing advance adjustment criterion to the UE. In an aspect, a method performed by a network component includes receiving, from each of a plurality of User Equipments (UEs), historical data including a history of autonomous timing advance adjustments and associated measurement metrics performed by the respective UE in a Radio Resource Control (RRC) non-connected state, and training a crowdsourcing machine learning model that outputs autonomous timing advance adjustment decisions, autonomous timing advance adjustments, or both by inputting the historical data from the plurality of UEs as training data. In an aspect, a User Equipment (UE) includes one or more memories, one or more transceivers, and one or more processors communicatively coupled to the on