Cyclic Shift Hopping for Shared UE Reference Signals
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently distinguishing reference signals from multiple user equipment (UEs) due to overlapping correlation peaks caused by high delay spread and non-ideal transmit timing, leading to increased resource element (RE) requirements and reduced accuracy in UE positioning.
Innovation Solution
The system employs a common set of resource elements for transmitting and receiving reference signals using a base sequence and configuration parameters, including cyclic shift hopping, to differentiate signals from multiple UEs by jointly analyzing received symbols or forwarding them for further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a common set of resource elements is used for transmitting reference signals from multiple UEs, then resource utilization efficiency is improved, but signal differentiation capability deteriorates due to overlapping correlation peaks
Solution Approach 1:
The patent applies cyclic shift hopping where the cyclic shift values change dynamically across different time instances (slots or symbols). Instead of using fixed cyclic shifts, the system hops through multiple cyclic shift values according to a predefined pattern, allowing the same resource elements to be reused while maintaining signal differentiation capability through time-varying characteristics.
Solution Approach 2:
The patent implements periodic cyclic shift hopping patterns where the cyclic shift values repeat after a certain period (e.g., every N slots or symbols). This periodic variation in cyclic shifts allows multiple UEs to share common resource elements while their signals remain distinguishable through the periodic modulation of transmission characteristics.
2Measurement precision
If cyclic shift hopping is employed to differentiate reference signals, then signal differentiation is improved, but system complexity increases due to additional configuration parameters
Solution Approach 1:
The patent designs the cyclic shift hopping mechanism to serve multiple functions simultaneously: it differentiates between multiple UEs sharing common resource elements, enables efficient resource reuse, and maintains compatibility with existing reference signal structures. The same cyclic shift hopping framework can be applied to various scenarios (downlink, uplink, positioning) without requiring separate complex mechanisms for each function.
3Productivity
If the number of resource elements is reduced to improve efficiency, then resource utilization is improved, but positioning accuracy deteriorates due to increased interference
Solution Approach 1:
By dynamically hopping cyclic shifts across time, the system can reuse the same resource elements for multiple UEs without creating persistent interference patterns. The dynamic nature of cyclic shift hopping allows the receiver to distinguish signals based on their temporal variation characteristics, maintaining positioning accuracy even with reduced resource element allocation.
Data Source
AI summary
An apparatus for a wireless communication system is provided. The apparatus is to transmit a reference signal on a common set of resource elements (REs), the common set of resource elements being used by one or more further apparatuses in the wireless communication system, so that the reference signal of the apparatus and one or more further reference signals of the one or more further apparatuses use the same resource elements. Moreover, the apparatus is to transmit the reference signal depending on a base sequence or a sequence derived from the base sequence and depending on a set of configuration parameters.