Uplink Positioning SRS Continuity During Cell Handover
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Solution Overview
Problem
Current uplink positioning methods in 5G wireless networks require suspension of sounding reference signal (SRS) transmissions when a user equipment (UE) moves across cells, leading to inefficiencies and increased latency during handover or cell reselection procedures.
Innovation Solution
Implementing a common SRS configuration valid for a group of cells within a Radio Access Network (RAN) notification area, allowing UE to continue using the same SRS configuration across multiple cells and report Receive-Transmit (Rx-Tx) values, with SRS configuration updates during inactive and connected modes, and determining uplink transmission power based on path loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a new SRS configuration is obtained from each serving cell during handover or cell reselection, then positioning accuracy is maintained, but messaging overhead and latency increase
Solution Approach 1:
The patent applies universality by creating a common SRS configuration that is valid across multiple serving cells within a RAN notification area. Instead of requiring cell-specific SRS configurations, a single universal configuration serves multiple cells, eliminating the need to obtain new configurations during handover or cell reselection. This reduces messaging overhead and latency while maintaining positioning functionality across cell boundaries.
2Manufacturing precision
If SRS transmission is suspended during handover or cell reselection, then configuration accuracy is maintained, but positioning continuity is broken
Solution Approach 1:
The patent implements continuity of useful action by enabling SRS transmissions to continue uninterrupted during handover or cell reselection procedures. The common SRS configuration remains valid across cell transitions, allowing the UE to maintain continuous positioning measurements and reports without suspension, thereby ensuring positioning continuity and reliability during mobility events.
3Measurement precision
If cell-specific SRS configurations are used, then positioning precision per cell is optimized, but device complexity increases
Solution Approach 1:
The patent applies merging by combining multiple cell-specific SRS configurations into a single common SRS configuration that is shared across multiple serving cells. This consolidation reduces the number of configuration parameters the UE must manage and store, simplifying device complexity while maintaining the ability to perform positioning measurements across different cells within the RAN notification area.
Data Source
AI summary
Techniques are utilizing positioning signals during handover or cell reselection procedures are provided. An example method for transmitting sounding reference signals includes obtaining sounding reference signal configuration information from a first station of a group of stations, wherein the sounding reference signal configuration is valid for each station in the group of stations, performing a handover or a cell reselection procedure with a second station, wherein the second station is one of the group of stations, and transmitting one or more sounding reference signals to the second station based on the sounding reference signal configuration information.