Cooperative Relay Node Coordination for Cell-Edge Throughput
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Solution Overview
Problem
Current wireless communication systems face challenges in enhancing throughput for user equipment (UEs) at cell-edges or coverage holes, particularly in scenarios with scattered coverage due to obstacles like buildings, where traditional relay nodes (RNs) may not provide adequate coverage.
Innovation Solution
The implementation of multiple relay nodes (RNs) in a cooperative multipoint transmission/reception (CoMP) system, where a communications controller coordinates channel measurements and HARQ operations across RNs to ensure reliable data transmission and error recovery, utilizing a method that involves transmitting packets to multiple RNs and adjusting based on their decoding capabilities to achieve cooperative gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional relay nodes are deployed to improve coverage, then coverage extension is achieved, but throughput enhancement for cell-edge UEs is insufficient
Solution Approach 1:
The patent combines multiple relay nodes to form a cooperative multipoint transmission system where multiple RNs work together to serve a single UE. This merging of multiple transmission points provides both coverage extension and throughput enhancement through coordinated transmission and reception operations across the relay network.
2Productivity
If cooperative multipoint transmission is implemented with multiple relay nodes, then throughput is enhanced, but system complexity increases
Solution Approach 1:
The patent introduces a donor eNB as a central coordinator that manages multiple relay nodes participating in CoMP operations. The donor eNB handles the complexity of coordinating transmissions across multiple RNs, performing channel measurements, and managing HARQ operations, thereby enabling throughput enhancement while containing system complexity through centralized control.
Solution Approach 2:
The patent implements feedback mechanisms where relay nodes report channel measurements and transmission status back to the donor eNB. This feedback enables the donor eNB to make informed decisions about coordinated transmissions, adjust transmission parameters, and manage retransmissions efficiently, reducing the complexity of managing multiple relay nodes through adaptive control.
3Reliability
If channel measurements are performed across multiple relay nodes, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent makes the donor eNB serve multiple functions: it acts as the serving base station for relay nodes, coordinates CoMP transmissions to UEs, performs channel measurements across multiple RNs, and manages HARQ operations. This multi-functionality consolidates the channel measurement and coordination tasks in a single entity, improving transmission reliability while reducing signaling overhead by eliminating the need for separate measurement coordination entities.
Data Source
AI summary
A method for communications controller operation that includes receiving a report from a communications node served by a communications controller, the report includes channel measurements of channels between the communications node and neighboring communications devices, establishing a cooperative operation for the communications node with communications devices neighboring the communications node based on the received report, and transmitting information to communications devices in the cooperative operation. The neighboring communications devices in the cooperative operation forward the information to the communications node.