Mobile Access Node Positioning With Adaptive SRSp Timing
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Solution Overview
Problem
Existing positioning methods in wireless communication systems face limitations in intra-gNB and inter-gNB mobility, particularly in scenarios where multiple gNBs use the same PRS configuration, leading to suboptimal positioning accuracy and efficiency.
Innovation Solution
A wireless transmit/receive unit (WTRU) receives configuration information for multiple sets of associations and timing advance (TA) offsets, allowing it to transmit sounding reference signals (SRSp) to mobile network nodes, including satellites, based on differential TA and relative location, and selects appropriate SRSp configurations for uplink-based positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the WTRU uses a single SRSp transmission configuration, then the device complexity is reduced, but positioning accuracy deteriorates due to inability to adapt to different satellite positions and differential TA values
Solution Approach 1:
The patent segments the SRSp transmission configuration into multiple distinct configurations, each optimized for specific scenarios (e.g., different satellite positions, differential TA ranges). The WTRU selects appropriate configurations based on current conditions, enabling adaptive positioning without requiring a single complex universal configuration.
Solution Approach 2:
The patent introduces dynamic selection of SRSp configurations based on real-time conditions such as satellite position, differential TA values, and WTRU location. The configuration is not static but adapts to changing environmental parameters, improving positioning accuracy while managing complexity through conditional selection rules.
2Reliability
If the WTRU transmits SRSp continuously without selective configuration, then positioning coverage is improved, but energy consumption increases due to unnecessary transmissions
Solution Approach 1:
The patent applies partial action by transmitting SRSp only when necessary - based on whether the current configuration is appropriate for the current satellite position and differential TA values. Instead of continuous transmission, the system performs selective transmissions that provide sufficient positioning coverage while conserving energy by avoiding redundant SRSp transmissions.
Solution Approach 2:
The patent changes transmission parameters (timing, frequency, power) based on differential TA values and satellite position. When parameters indicate suboptimal conditions, the WTRU adjusts or delays SRSp transmission, optimizing the balance between maintaining positioning coverage and reducing energy consumption.
3Stability of the object's composition
If the WTRU applies large TA offsets for distant satellites, then signal synchronization is improved, but positioning accuracy deteriorates due to excessive timing adjustment
Solution Approach 1:
The patent applies different TA offset strategies based on local conditions - specifically the differential TA values and satellite distance. For nearby satellites with small differential TA, minimal offset is applied. For distant satellites, appropriate offsets are applied to maintain synchronization. This localized approach to TA offset application maintains synchronization where needed while preserving positioning accuracy where possible.
Solution Approach 2:
The patent dynamically changes the TA offset parameter based on measured differential TA values and satellite position. Rather than using a fixed large offset for all distant satellites, the system adjusts the offset magnitude to the minimum necessary for synchronization, thereby maintaining signal stability while minimizing impact on positioning accuracy.
4Productivity
If multiple gNBs use the same PRS configuration, then network resource utilization is improved, but positioning accuracy deteriorates due to ambiguity in identifying transmitting gNB
Solution Approach 1:
The patent performs preliminary identification of the transmitting satellite or gNB before positioning measurements are taken. By establishing identity information in advance (through indication messages from the LMF or gNB), the system resolves ambiguity before the positioning calculation, allowing multiple gNBs to safely reuse PRS configurations without compromising positioning accuracy.
Solution Approach 2:
The patent introduces an intermediary indication mechanism (LMF or gNB providing satellite/gNB identity information) that mediates between the resource-efficient reuse of PRS configurations and the accuracy requirement for identifying the transmitting node. This intermediary layer provides the necessary identification information without requiring unique PRS configurations for each gNB.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may be configured to receive configuration information indicating a plurality of sets of associations. Each set of associations may comprise a plurality of respective time instances and a plurality of respective timing advance (TA) offsets. The WTRU may transmit an indication of at least one of a mobile network node identification or WTRU location information. The WTRU may receive an indication of a first set of associations of the plurality of sets of associations. The WTRU may transmit a first sounding reference signal (SRS) for positioning (SRSp) transmission beginning at a first time. The first time may be determined based on at least a first TA offset of the first set of associations and a respective first time instance associated with the first TA offset.