DeNB Relay Node Backhaul Subframe Coordination
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Solution Overview
Problem
Current radio communication systems with relay nodes face challenges in coordinating backhaul subframe configurations between relay nodes registered to different base stations, leading to interference between RN-access links, which existing methods cannot effectively address.
Innovation Solution
The system enables base stations to acquire and coordinate time resource configurations between relay nodes connected to other base stations, allowing for interference coordination between relay nodes registered to different base stations by exchanging or detecting backhaul subframe configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay nodes share common radio resources among DeNB-access link, RN-access link, and backhaul link, then resource utilization efficiency is improved, but self-interference occurs between backhaul and RN-access links at the relay node
Solution Approach 1:
The radio resources are segmented into distinct backhaul subframes and non-backhaul subframes. Backhaul subframes are specifically allocated for backhaul link communication between DeNB and RN, while non-backhaul subframes are used for RN-access link communication. This temporal segmentation prevents self-interference by ensuring that the RN does not simultaneously transmit and receive on the same frequency resources.
2Object-affected harmful factors
If backhaul subframe coordination method is applied to differentiate backhaul subframe timings between multiple relay nodes, then interference between RN-access links is reduced, but the complexity of coordinating backhaul subframe configurations between relay nodes registered to different base stations increases
Solution Approach 1:
The DeNB acts as an intermediary that collects backhaul subframe configuration information from RNs registered to different DeNBs and coordinates the configurations. The DeNB receives backhaul subframe configuration information from other DeNBs via X2 interface, determines appropriate backhaul subframe configurations for its registered RNs, and provides this information to the RNs. This intermediary approach centralizes the coordination complexity at the DeNB level, simplifying the overall system management.
Solution Approach 2:
The system implements feedback mechanisms where RNs report their current backhaul subframe configurations to their serving DeNB, and DeNBs exchange configuration information via X2 interface. This feedback loop enables dynamic coordination and optimization of backhaul subframe configurations across multiple DeNBs and RNs, allowing the system to adapt to changing network conditions and interference patterns.
3Productivity
If relay nodes are deployed to enhance coverage area and throughput, then mobile station performance in coverage holes is improved, but interference between relay nodes registered to different base stations cannot be effectively coordinated
Solution Approach 1:
The DeNB serves as an intermediary that collects backhaul subframe configuration information from other DeNBs via X2 interface and uses this information to determine appropriate backhaul subframe configurations for its registered RNs. This coordination mechanism enables effective interference management between RNs registered to different DeNBs, allowing the system to deploy more RNs for coverage enhancement while maintaining acceptable interference levels through coordinated resource allocation.
Data Source
AI summary
A communication system includes a plurality of DeNBs (base stations) and a plurality of RNs (relay nodes), wherein each RN has a radio connection with a DeNB. Each DeNB acquires time resource configuration applied between another base station and a relay node connected with said another base station.