SRS Frequency Hopping in BWP-Less Windows for RedCap Positioning
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Solution Overview
Problem
Existing mobile communication systems face challenges in performing SRS frequency hopping for positioning due to the need for time-consuming BWP switching, which is inefficient for RedCap UEs with limited bandwidth capabilities.
Innovation Solution
Implementing a BWP-less window (BLW) configuration that allows RedCap UEs to perform SRS frequency hopping without BWP switching, enabling fast RF switching between hops while maintaining phase alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BWP switching is performed for SRS frequency hopping, then positioning accuracy can be maintained, but time latency increases significantly
Solution Approach 1:
The patent extracts the BWP switching requirement from the SRS frequency hopping process by introducing a BWP-less window configuration. During this special window, SRS transmissions can hop across frequency bands without requiring BWP reconfiguration, thereby eliminating the time-consuming BWP switching while maintaining the ability to perform accurate positioning measurements through frequency diversity.
Solution Approach 2:
The network configures the BWP-less window in advance with pre-defined frequency hopping patterns and SRS transmission parameters. This preliminary configuration allows the UE to immediately perform frequency hopping during the window without needing to process BWP switching commands in real-time, thus reducing latency while preserving measurement accuracy.
2Adaptability or versatility
If BWP switching is performed for SRS frequency hopping, then frequency band coverage is maintained, but processing complexity increases
Solution Approach 1:
The patent removes the BWP switching processing step from the SRS frequency hopping sequence by defining a BWP-less operational mode. In this mode, the UE transitions directly between frequency bands using pre-configured hopping patterns, eliminating the need for complex BWP reconfiguration processing while still achieving comprehensive frequency band coverage for positioning.
Solution Approach 2:
The patent changes the operational parameters by introducing a BWP-less state where traditional BWP configuration parameters are suspended. Instead, simplified frequency hopping parameters are activated, reducing the computational burden on the UE while maintaining the ability to access multiple frequency bands for robust positioning measurements.
3Speed
If fast RF switching is implemented without BWP switching, then latency is reduced, but configuration complexity increases
Solution Approach 1:
The network entity performs the complex configuration work in advance by setting up BWP-less windows with predefined frequency hopping patterns, time durations, and SRS parameters. This upfront configuration enables the UE to execute fast RF switching during the window without real-time decision-making complexity, achieving low latency while distributing the configuration burden to the network side.
Solution Approach 2:
The BWP-less window acts as an intermediary mechanism that mediates between the need for fast RF switching and the requirement for proper signal configuration. It provides a controlled environment where frequency hopping can occur rapidly with pre-validated parameters, simplifying the UE's processing while enabling high-speed operation.
Data Source
AI summary
The disclosure includes an apparatus, having: means for receiving, from a network entity, configuration information to indicate a window which is bandwidth-part free; and means for transmitting, to the network entity, a sounding reference signal in frequency hopping within the indicated window. The disclosure also includes a method which may include receive, from a network entity, configuration information to indicate a window which is bandwidth-part free. The method may also include transmitting, to the network entity, a sounding reference signal in frequency hopping within the indicated window.