Access Node PDCCH Resource Allocation for Relay Interference
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Solution Overview
Problem
Simultaneous use of access nodes and relay nodes in wireless communication systems leads to undesirable interference, affecting control signaling and resource allocation, particularly in LTE networks, which can impact signal quality and throughput.
Innovation Solution
An access node acts as a central control mechanism to coordinate and allocate physical downlink control channel resources exclusively to relay nodes, ensuring interference avoidance by managing resource allocation dynamically, semi-statically, or statically, and coordinating uplink control signaling resources to minimize interference between access and direct links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If access nodes and relay nodes simultaneously use the same physical downlink control channel resources, then network coverage and connectivity are improved, but interference between access and relay links increases
Solution Approach 1:
The patent segments the physical downlink control channel resources by creating separate resource pools: one for access links and another for relay links. The access node allocates specific resource blocks to relay nodes exclusively, preventing simultaneous transmission on the same resources and eliminating interference while maintaining comprehensive network coverage.
Solution Approach 2:
The access node acts as an intermediary that coordinates resource allocation between access and relay links. It receives channel quality indicators from relay nodes, determines appropriate resource allocations, and assigns dedicated physical downlink control channel resources to relay nodes, thereby mediating the resource conflict and preventing interference.
2Object-affected harmful factors
If relay nodes use dedicated physical downlink control channel resources allocated by access nodes, then interference is reduced, but resource allocation complexity increases
Solution Approach 1:
The access node performs preliminary resource allocation by pre-configuring dedicated physical downlink control channel resources for relay nodes based on channel quality indicators. This advance planning eliminates the need for complex real-time coordination during data transmission, reducing operational complexity while maintaining interference-free communication.
Solution Approach 2:
Relay nodes autonomously monitor their allocated physical downlink control channel resources and independently determine channel quality indicators without requiring complex coordination with other relay nodes. This self-service approach simplifies the overall system complexity while ensuring dedicated resource usage and interference avoidance.
3Productivity
If dynamic resource allocation is implemented for physical downlink control channels, then resource utilization efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements local quality optimization by allocating physical downlink control channel resources based on specific channel conditions of each relay node. The access node receives channel quality indicators from individual relay nodes and assigns resources accordingly, ensuring efficient resource utilization tailored to local conditions while minimizing unnecessary control signaling for nodes with stable channels.
Data Source
AI summary
An access node comprising a processor configured to promote allocation of a physical downlink control channel (PDCCH) resource to a relay node. The PDCCH resource is configured for use by the relay node. The access node is further configured to exclusively control allocation of the PDCCH resource.