Relay Node R-PDCCH Resource Allocation in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in allocating resources for physical channels, particularly in relay systems, which affect the processing of downlink signals and the integration of frequency diversity and frequency selective R-PDCCH transmissions.
Innovation Solution
The method involves setting a searching space for the second physical control channel through RRC signaling, interleaving the first and second physical control channels, and using the first channel for downlink grants and the second channel for uplink grants, incorporating R-PDCCH and PDSCH, to efficiently allocate resources in relay systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency diversity R-PDCCH and frequency selective R-PDCCH transmissions are supported in the same cell and subframe using FDM multiplexing, then transmission flexibility and spectral efficiency are improved, but resource allocation complexity and interference management difficulty increase
Solution Approach 1:
The patent segments the control region into dedicated frequency diversity R-PDCCH resources and frequency selective R-PDCCH resources, allocating them to different PRB pairs. This segmentation allows both transmission modes to coexist in the same cell and subframe without resource conflicts, while the eNB maintains simplified scheduling by treating each mode independently within its designated resources.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by mapping frequency diversity R-PDCCH to specific PRB pairs in the frequency domain, while frequency selective R-PDCCH uses other PRB pairs. This spatial separation in the frequency domain enables simultaneous transmission of both modes without mutual interference, resolving the complexity of managing multiple transmission modes in a single resource pool.
2Productivity
If R-PDCCH and R-PDSCH resources are allocated without considering relay-specific requirements, then resource allocation simplicity is maintained, but relay system performance and downlink signal processing efficiency deteriorate
Solution Approach 1:
The patent applies local quality by configuring relay nodes with specific search spaces for R-PDCCH in certain PRB pairs, tailored to each relay's operational requirements. The eNB determines R-PDCCH resources based on relay-specific characteristics such as backhaul link conditions and served UEs, optimizing resource allocation for each relay individually rather than using a uniform approach.
Solution Approach 2:
The patent implements preliminary action by having the eNB configure and signal the R-PDCCH search space for each relay node in advance through higher-layer signaling. This pre-configuration allows relays to efficiently locate and decode their control information without real-time search, improving downlink signal processing efficiency while the eNB maintains manageable complexity through centralized configuration.
3Reliability
If the search space for R-PDCCH is not properly configured, then system operation simplicity is maintained, but control information reception reliability and downlink signal processing accuracy deteriorate
Solution Approach 1:
The patent uses higher-layer signaling as an intermediary mechanism to convey R-PDCCH search space configuration information from the eNB to relay nodes. This intermediary approach ensures reliable transmission of control information by providing relays with explicit instructions on where to search for their R-PDCCH, while the eNB maintains centralized control over the configuration process.
Solution Approach 2:
The patent applies preliminary action by configuring the R-PDCCH search space in advance through higher-layer signaling before actual data transmission occurs. This pre-configuration ensures that relay nodes have all necessary information about their designated search spaces ready in advance, guaranteeing reliable control information reception while simplifying the operational process for both eNB and relays.
Data Source
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AI summary
The present invention relates to a wireless communication system and preferably to a wireless communication system comprising a relay. More specifically, the present invention relates to a method for allocating backhaul resources and to a device for the same. Also, the present invention relates to a method for allocating resources for a physical control channel and to a device for the same. Also, the present invention relates to a method for processing downlink signals and to a device for the same.