Reference Signal Mapping for Wireless Terminals
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently managing reference signals (RS) for terminals with varying bandwidth sizes and locations, leading to resource shortages and increased signaling overhead.
Innovation Solution
A method for mapping a reference signal sequence to a physical resource, where the sequence length is configured based on terminal bandwidth, and the sequence is either repeated or truncated to fit the allocated resource, with scrambling applied as needed, using common resources for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate RS sequences are configured for each terminal bandwidth, then each terminal can have optimized RS performance, but signaling overhead increases and resource efficiency decreases
Solution Approach 1:
The patent applies universality by configuring a single RS sequence that can be used by multiple terminals with different bandwidths. The network device configures one RS sequence with a first length, and both first terminals (with bandwidth matching the sequence length) and second terminals (with bandwidth smaller than the sequence length) can use this same sequence. This eliminates the need for separate RS sequences for different terminal types, thereby reducing signaling overhead while maintaining RS performance through selective mapping.
2Adaptability or versatility
If RS sequence length is increased to cover all terminal bandwidths, then all terminals can use the same sequence, but resource efficiency decreases for terminals with smaller bandwidth
Solution Approach 1:
The patent applies segmentation by dividing the usage of a single RS sequence into different segments based on terminal bandwidth. The RS sequence with first length is segmented in usage: first terminals use the entire sequence, while second terminals use only a portion (second length) of the sequence. This segmentation allows efficient resource utilization where terminals with smaller bandwidth consume only the necessary portion of the RS sequence, improving overall resource efficiency while maintaining adaptability across different terminal types.
Solution Approach 2:
The patent applies local quality by allowing different terminals to use different portions or lengths of the same RS sequence based on their specific bandwidth requirements. First terminals use the full RS sequence of first length, while second terminals use a truncated version of second length. This local adaptation ensures that each terminal uses the appropriate amount of RS resources for its bandwidth, optimizing resource efficiency without sacrificing versatility.
3Quantity of substance
If RS sequence is truncated for terminals with smaller bandwidth, then resource efficiency improves, but sequence consistency across terminals decreases
Solution Approach 1:
The patent resolves the consistency issue through universality by having all terminals derive their RS sequences from the same parent sequence configured by the network. Even though second terminals use a truncated version (second length) of the RS sequence, both first and second terminals are using portions of the same underlying sequence with the same configuration parameters. This maintains sequence consistency in terms of generation and configuration, while allowing flexible length adaptation for resource efficiency.
Data Source
AI summary
The present disclosure provides a method for mapping a reference signal (RS) sequence to a physical resource in a wireless communication system. Specifically, the method performed by a terminal comprises the steps of: receiving, from a network, length information indicating a length of the RS sequence and offset information indicating a start position of the RS sequence mapped to the physical resource allocated to the terminal; generating the RS sequence on the basis of the received length information; and mapping the generated RS sequence to the physical resource on the basis of the offset information.