UE-Specific Uplink SRS for Interference Mitigation
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Solution Overview
Problem
In wireless communications, particularly in low power states, controlling UE uplink (UL) SRS transmission in inactive modes is challenging due to interference issues and the need for precise timing advance values, especially in scenarios with fewer listening devices, which complicates coordination and increases signaling load.
Innovation Solution
The solution involves enabling listening devices to detect and measure UL SRS transmissions, allowing them to report back to the LMF, which can then determine if interference is occurring and notify the UE to transition to a connected mode, reconfiguring UL SRS settings as needed, using unique identifiers or preambles reserved for positioning to facilitate efficient and interference-free UL SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE transmits UL SRS in inactive mode for positioning, then positioning capability is improved, but interference occurs and signaling load increases
Solution Approach 1:
The patent segments the UL SRS transmission resources by introducing unique identifiers (such as SRS-ResourceId or Zadoff-Chu sequence roots) that are specific to each UE. This segmentation allows multiple UEs to transmit simultaneously without causing harmful interference, as each UE's transmission can be individually identified and measured by listening devices.
Solution Approach 2:
The patent applies local quality by configuring UE-specific parameters for UL SRS transmission, including unique identifiers, timing advance values, and power control settings. These localized configurations ensure that each UE's transmission has the appropriate characteristics for its specific positioning scenario, improving measurement precision while managing interference.
2Measurement precision
If UE transmits UL SRS in inactive mode with precise timing advance, then positioning accuracy is improved, but coordination complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring UL SRS parameters (unique identifiers, timing advance values, power control settings) while the UE is in connected mode before transitioning to inactive mode. This pre-configuration reduces the coordination complexity during inactive mode operation, as the UE can autonomously transmit using pre-established parameters without requiring real-time network coordination.
3Use of energy by moving object
If UE remains in inactive mode for power saving, then energy consumption is reduced, but positioning functionality is limited
Solution Approach 1:
The patent enables self-service by allowing UEs in inactive mode to autonomously transmit UL SRS using pre-configured parameters including unique identifiers and timing advance values. This self-service capability maintains positioning functionality while the UE remains in power-saving inactive mode, as no active network coordination is required during the transmission.
4Object-generated harmful factors
If unique identifiers are assigned to each UE for UL SRS transmission, then interference is mitigated, but signaling load increases
Solution Approach 1:
The patent merges the unique identifier assignment with existing positioning configuration procedures. The unique identifiers (SRS-ResourceId, Zadoff-Chu sequence roots) are integrated into the standard positioning configuration signaling, allowing multiple UEs to be configured efficiently in bulk rather than requiring separate individual signaling for each identifier assignment.
Data Source
AI summary
A method (1100) by a user equipment, UE, (512) for unique identification of the UE for positioning includes transmitting (1102), to a network node (510), an uplink signal that is generated based on a unique identifier associated with the UE or that uses a preamble that is reserved for positioning.