Adaptive Backhaul Reference Signal Allocation in Relay Systems
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Solution Overview
Problem
In relay communication systems, the variability in backhaul signal resources due to propagation delay poses challenges in efficiently transmitting and receiving data, as existing methods do not effectively adapt reference signals to changing resource availability, leading to potential performance degradation.
Innovation Solution
The method involves setting a guard band in the subframe resource element of the downlink channel to allocate reference signals, allowing for puncturing of symbols during mode conversion of the relay node, thereby enabling effective channel estimation and data demodulation even with varying backhaul signal resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are allocated to all symbols in the data transmission period, then channel estimation accuracy is improved, but resource waste occurs when propagation delay is great and available backhaul resources are reduced
Solution Approach 1:
The patent applies dynamics by making the reference signal allocation pattern adaptive and variable based on propagation delay conditions. The system dynamically selects between different reference signal allocation patterns (first pattern for great propagation delay, second pattern for less propagation delay) to optimize the balance between channel estimation accuracy and resource utilization according to actual communication environment
Solution Approach 2:
The patent changes the parameter of reference signal allocation pattern based on propagation delay measurements. When propagation delay is great, the system switches to a first allocation pattern that reduces reference signal density to conserve resources. When propagation delay is less, it switches to a second allocation pattern that increases reference signal density to improve channel estimation accuracy, thus adapting to different communication conditions
2Measurement precision
If the amount of backhaul signal resources is increased in environments with less propagation delay, then channel estimation performance is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple reference signal allocation patterns in advance. The system measures propagation delay and selects the appropriate pre-defined pattern, avoiding complex real-time optimization calculations. This approach simplifies the resource allocation process while still achieving optimal channel estimation performance for different propagation delay conditions
3Ease of operation
If a fixed reference signal allocation method is used, then implementation simplicity is maintained, but performance degradation occurs in varying communication environments
Solution Approach 1:
The patent transforms the fixed reference signal allocation into a dynamic system that adapts to varying communication environments. By measuring propagation delay and selecting from pre-defined allocation patterns, the system maintains implementation simplicity while achieving reliable communication performance across different propagation delay conditions, thus resolving the contradiction between simplicity and reliability
Data Source
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AI summary
The present invention relates to a method and to an apparatus for transmitting/receiving data in a relay communication system. The method comprises the steps of: setting, as a guard band, the first predetermined number of symbol transmission slots of a data transmission period in a subframe resource element of a downlink channel constituted by a control signal transmission period to which a control signal is allocated and the data transmission period to which downlink data is allocated; allocating reference signals to symbols of the data transmission period; puncturing the symbols corresponding to the guard band from among the symbols to which said reference signals are allocated; and transmitting signals to which said reference signals are allocated.