Reference Signal Mapping for Wireless Backhaul Resource Efficiency
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Solution Overview
Problem
In wireless communication systems, particularly in next-generation multimedia systems, there is a need for efficient transmission of reference signals to ensure reliable channel estimation and data transmission, especially in scenarios involving relay stations where backhaul and access link resources are limited, leading to reduced radio resource efficiency.
Innovation Solution
A method and apparatus for transmitting a reference signal in a wireless communication system, where the reference signal is generated and mapped to a resource region based on Hybrid Automatic Repeat Request (HARQ) processing time, backhaul link sub-frame position, and transmission period, allowing for efficient allocation and transmission of Channel State Information Reference Signals (CSI RS) considering HARQ processing time in the backhaul link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are assigned to all subcarriers using a preamble signal, then channel estimation performance is improved, but transmission data amount is reduced
Solution Approach 1:
The patent applies local quality by assigning reference signals to specific subcarriers rather than all subcarriers. The reference signal assignment is localized to certain frequency positions (e.g., every fourth subcarrier or specific resource elements) while other subcarriers carry data, creating non-uniform resource allocation that optimizes both estimation accuracy and data throughput in different frequency regions
2Quantity of substance
If reference signals are assigned between data subcarriers, then transmission data amount is increased, but channel estimation performance is deteriorated
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting reference signal density and assignment patterns based on channel conditions, modulation schemes, and system configuration. The reference signal assignment parameters (such as frequency spacing, time periodicity, and resource element positions) are configurable to adapt to different operational scenarios, allowing optimization of the trade-off between data rate and estimation accuracy
3Area of stationary object
If relay stations are deployed to expand cell coverage, then coverage area is increased, but radio resource efficiency is reduced due to limited backhaul and access link resources
Solution Approach 1:
The patent applies segmentation by dividing the wireless communication system into distinct functional segments: backhaul link (base station to relay station) and access link (relay station to user equipment). Each link type receives optimized resource allocation and reference signal assignment strategies tailored to its specific requirements, allowing independent optimization of coverage extension and resource efficiency without mutual interference
Data Source
AI summary
A method and apparatus of transmitting a reference signal in a wireless communication system is provided. A transmitter generates the reference signal, maps the reference signal to a resource region, and transmits the reference signal, mapped to the resource region, to a user equipment (UE). The resource region to which the reference signal is mapped is determined based on at least one of a hybrid automatic repeat request (HARQ) processing time for backhaul link transmission, a position of a backhaul link sub-frame, and a transmission period of the reference signal.