Relay Node Control Channel Resource Allocation in LTE-A Backhaul
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Solution Overview
Problem
In wireless communication systems, particularly in LTE-A, the allocation of control channel resources for relay nodes within backhaul subframes is inefficient due to high hardware complexity and the need for frequent blind decodings, leading to resource wastage and increased implementation complexity.
Innovation Solution
The method involves dividing the resource region for relay nodes into multiple resource groups and allocating the same resource group to relays operating in the same transmission mode, reducing the number of blind decodings and maximizing frequency diversity gain by supporting both interleaved and non-interleaved resource groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the control channel resource is allocated semi-statically to relay nodes, then the resource allocation is simplified and easier to manage, but the resource cannot be easily changed in size and cannot be allocated in a frequency selective manner, resulting in resource wastage
Solution Approach 1:
The control channel resource is divided into multiple resource groups, each group being independently allocable. This segmentation allows the system to maintain semi-static allocation for simplicity while enabling frequency-selective allocation by selecting specific resource groups based on channel conditions, thus resolving the contradiction between allocation simplicity and adaptability.
2Adaptability or versatility
If a large amount of semi-static resource is informed to perform frequency selective resource allocation, then frequency selective allocation is enabled, but the number of blind decodings increases especially when small transmission resource is allocated, resulting in degradation of efficiency
Solution Approach 1:
By segmenting the control channel resource into multiple resource groups, the relay node only needs to perform blind decoding on the specific resource group allocated to it rather than searching through all semi-static resources. This reduces the number of blind decodings and improves decoding efficiency while maintaining frequency selective allocation capability.
Solution Approach 2:
Different resource groups can be allocated to different relay nodes based on their specific channel conditions and transmission modes. This local quality approach ensures that each relay node performs blind decoding only in its allocated resource group, reducing overall system complexity and improving efficiency.
3Adaptability or versatility
If the relay resource region is pre-configured in a large size, then frequency selective resource allocation can be performed, but the relay must perform a plurality of blind decodings, resulting in an increase of relay implementation complexity
Solution Approach 1:
The large pre-configured resource region is segmented into multiple smaller resource groups. The relay node only needs to monitor and perform blind decoding on its specifically allocated resource group rather than the entire large resource region, significantly reducing implementation complexity while preserving frequency selective allocation capabilities.
Data Source
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AI summary
A method by a base station in a communication system comprises generating, by the base station, a signaling message including information for a control channel, the information for the control channel including information on at least one of resource block set, and information on a reference signal. The base station transmits the signaling message including information for the control channel to a node, and generates the control channel and the reference signal based on the information for the control channel. The base station transmits the control channel and the reference signal generated based on the at least one of resource block set, to the node, wherein the information for the control channel comprises resource assignment information, which indicates the Resource Block set.