Relay Node Control Channel Mapping for Interference Reduction
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the efficient transmission of control channels to relay nodes is challenging due to limitations in resource allocation and mapping techniques, leading to potential interference and reduced service coverage.
Innovation Solution
The method involves allocating and mapping Resource Blocks (RBs) for relay node specific downlink physical control channels (R-PDCCH) along a frequency direction, starting from the lowermost index, and then mapping along the next index, ensuring effective transmission and minimizing inter-cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channels are transmitted using conventional resource allocation methods, then transmission can be performed, but interference increases and service coverage is reduced
Solution Approach 1:
The patent applies local quality by configuring cell-specific reference signal patterns and resource element allocations for relay nodes. Different resource element positions and reference signal configurations are assigned to different relay nodes, allowing each to receive control information with minimal interference from other cells. This localized resource allocation improves reception reliability while reducing inter-cell interference.
Solution Approach 2:
The patent introduces frequency-domain resource block allocation as an additional dimension for control channel transmission. By allocating specific resource blocks in the frequency domain and using frequency-division multiplexing for reference signals, the system expands the resource allocation space, enabling multiple relay nodes to simultaneously receive control information with reduced interference.
2Area of stationary object
If resource blocks are allocated for relay node control channels, then service coverage can be extended, but resource allocation complexity increases
Solution Approach 1:
The patent segments the control information for relay nodes into separate physical downlink control channels (PDCCH) allocated to specific resource blocks. Each relay node is assigned dedicated resource blocks and reference signal patterns, allowing independent configuration and management. This segmentation enables extended service coverage through multiple relay nodes while simplifying resource allocation management through modular, cell-specific configurations.
3Productivity
If conventional mapping techniques are used for control channels, then transmission can be performed, but transmission efficiency is reduced
Solution Approach 1:
The patent implements feedback mechanisms where relay nodes monitor the quality of received control channels using cell-specific reference signals and report channel state information back to the base station. This feedback enables dynamic adjustment of resource allocation and modulation schemes, improving both transmission efficiency and reception reliability through adaptive optimization.
Solution Approach 2:
The patent changes key transmission parameters including reference signal power, resource block allocation patterns, and modulation schemes based on channel conditions and relay node requirements. By dynamically adjusting these parameters, the system optimizes transmission efficiency while maintaining reliable reception across extended service areas.
Data Source
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AI summary
A method for transmitting a relay node specific downlink physical control channel (R-PDCCH) at a base station in a wireless communication system is disclosed. More specifically, the method includes the steps of allocating one or more Resource Blocks (RBs) for the relay node specific downlink physical control channel, mapping the relay node specific downlink physical control channel to the one or more resource blocks, and transmitting the relay node specific downlink physical control channel to the relay node by using the one or more resource blocks, wherein the mapping step includes mapping the relay node specific downlink physical control channel along a frequency direction in a symbol belonging to a lowermost index, among the one or more resource blocks, and then mapping the relay node specific downlink physical control channel along the frequency direction in a symbol belonging to a next index.