Multi-cell Cooperative Transmission Resource Allocation
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Solution Overview
Problem
Current CoMP technologies face complexity and high backhaul overhead in coordinating multi-cell cooperative transmission, limiting their ability to increase cell-edge capacity effectively due to complex resource allocation and computation requirements.
Innovation Solution
A method and apparatus for simplifying multi-cell cooperative transmission by determining whether a mobile station is a cell-edge or cell-inner MS, allocating radio resources based on channel information, and enabling BS cooperation on a supercell basis to reduce complexity and backhaul overhead, allowing simultaneous signal transmission to MSs across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CoMP transmission is implemented to increase cell-edge capacity, then cell-edge capacity is improved, but system complexity and backhaul overhead increase
Solution Approach 1:
The patent segments the cell coverage into cell-edge regions and cell-inner regions, applying different transmission strategies to each. Cell-edge MSs receive coordinated multi-point transmission from multiple BSs, while cell-inner MSs receive transmission from their serving BS only. This segmentation allows the system to gain cell-edge capacity improvements without extending the complex CoMP mechanism to all MSs, thereby controlling overall system complexity.
Solution Approach 2:
The patent applies different transmission qualities and mechanisms to different spatial locations. At cell edges where interference is severe, full CoMP transmission with multiple BSs coordinating is applied. In cell-inner regions where interference is naturally lower, simpler single-BS transmission is used. This local differentiation optimizes performance where needed while minimizing complexity elsewhere.
2Productivity
If CoMP transmission is implemented to increase cell-edge capacity, then cell-edge capacity is improved, but backhaul overhead increases
Solution Approach 1:
The patent segments backhaul information exchange requirements based on MS location. For cell-edge MSs, full backhaul coordination between serving and neighbor BSs is established. For cell-inner MSs, no backhaul coordination is needed as only the serving BS transmits. This segmentation significantly reduces overall backhaul overhead while maintaining cell-edge capacity improvements.
3Productivity
If resource allocation and CoMP signal processing are coordinated across multiple BSs, then cell-edge capacity increases, but computation complexity increases
Solution Approach 1:
The patent segments the computation workload by location. Serving BSs perform full resource allocation and signal processing for cell-edge MSs coordinated with neighbor BSs. Neighbor BSs participate in coordination only for cell-edge MSs, not for all MSs. This segmentation concentrates computation where necessary while reducing overall computational burden across the network.
Data Source
AI summary
A method and apparatus for multi-cell cooperative transmission are provided, for increasing the capacity of an MS at a cell edge through cooperation among a plurality of adjacent cells or BSs each having a plurality of antennas. The present invention improves Coordinated Multi Point (CoMP) performance due to simple CoMP implementation and reduced backhaul overhead and delay, and enables simple implementation of a CoMP resource allocation process and reduces handover overhead by eliminating handover between CoMP processing units.