Reference Signal Cyclic Shift Hopping for UE Positioning
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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 method where reference signals from multiple apparatuses share a common set of resource elements, using a base sequence and configuration parameters such as cyclic shifts to differentiate and distinguish between signals, allowing for joint analysis and processing of received symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals from multiple UEs use separate resource elements, then signal differentiation is improved, but resource element requirements increase
Solution Approach 1:
Multiple UEs transmit reference signals on the same resource elements by combining their sequences with different cyclic shifts. This merging approach allows signal differentiation through cyclic shift separation while reducing resource element requirements, directly resolving the contradiction between signal differentiation and resource consumption.
Solution Approach 2:
The system changes the cyclic shift parameter to differentiate between multiple UEs' reference signals transmitted on the same resource elements. By varying the cyclic shift parameter, the system achieves signal differentiation without requiring additional resource elements, thus resolving the contradiction.
2Object-generated harmful factors
If cyclic shift hopping is implemented, then interference randomization is improved, but system complexity increases
Solution Approach 1:
Cyclic shift hopping implements periodic changes in the cyclic shift parameter according to a predetermined pattern. This periodic action randomizes interference over time while maintaining a structured, predictable pattern that limits system complexity, resolving the contradiction between interference randomization and system complexity.
Solution Approach 2:
The cyclic shift hopping mechanism uses predetermined patterns that enable UEs to autonomously determine their cyclic shift values without complex centralized coordination. This self-service approach randomizes interference while keeping system complexity manageable through simple, pre-defined hopping patterns.
3Quantity of substance
If cyclic shifts are used to differentiate reference signals, then resource utilization is improved, but correlation peak overlap increases under high delay spread
Solution Approach 1:
The system dynamically changes cyclic shift values over time according to a hopping pattern. This dynamic approach allows reference signals to be differentiated on the same resource elements during periods when delay spread effects are minimal, while maintaining good correlation peak separation, thus resolving the contradiction between resource utilization and correlation peak separation.
Solution Approach 2:
By periodically hopping between different cyclic shift values, the system ensures that correlation peaks from different UEs do not consistently overlap. This periodic variation in cyclic shifts maintains resource utilization efficiency while improving correlation peak separation under high delay spread conditions.
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.