Adaptive Uplink CoMP Payload Selection for Backhaul Bandwidth Reduction
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Solution Overview
Problem
The high cost and complexity of the transport network required for Uplink Coordinated Multipoint (UL-CoMP) in 4G wireless communication networks, due to the need for significant inter-cellular bandwidth, limit the widespread deployment of CoMP systems, as traditional interference mitigation techniques require excessive backhaul capacity.
Innovation Solution
An adaptive method and system that allows base stations to determine and send different types of CoMP payloads based on resource usage and backhaul link congestion, optimizing bandwidth usage by selecting between TB, LLR, FD-IQ, and TD-IQ payload types, enabling efficient inter-cellular signal processing and interference mitigation without the need for raw signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digitized RF spectrum signals are transported from neighboring cells for UL-CoMP, then signal reception quality is improved, but backhaul bandwidth requirement increases by 20-40 times
Solution Approach 1:
The patent extracts only the essential signal processing data (transport blocks, log-likelihood ratios, or frequency-domain IQ samples) needed for CoMP operations, rather than transporting complete digitized RF spectrum signals. This extraction approach maintains signal reception quality while dramatically reducing backhaul bandwidth requirements by 20-40 times.
Solution Approach 2:
The patent segments the signal processing data into different payload types (transport blocks, LLRs, FD-IQ samples) that can be selectively transported based on operational needs. This segmentation allows the system to transmit only the necessary data components rather than complete signals, reducing overall backhaul bandwidth consumption.
2Adaptability or versatility
If multiple CoMP payload types are supported, then system adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic payload type selection where base stations can adaptively choose among different CoMP payload types (TB, LLR, FD-IQ) based on current network conditions, channel quality, and resource availability. This dynamic approach improves system adaptability while managing complexity through conditional logic rather than permanent multi-mode capability.
Solution Approach 2:
The patent applies different payload types to different CoMP operations based on local requirements. For example, transport blocks may be used for certain signal conditions while log-likelihood ratios are used for others, allowing each operation to use the most appropriate data format rather than requiring all operations to support all payload types simultaneously.
Data Source
AI summary
A method and system for adaptive coordinated multipoint support in a wireless communication system are disclosed. According to one aspect, the invention provides an uplink coordinated multipoint, CoMP, method. A CoMP request is received at a cooperating base station from a serving base station. The CoMP request specifies a first CoMP payload type. Responsive to receiving the CoMP request, a second type of CoMP payload to provide to the serving base station is provided. The second type of CoMP payload is determined based at least in part on resource usage. The cooperating base station provides a CoMP payload of the determined second CoMP payload type to the serving base station.