Cooperative Heterogeneous Network Segmentation for Interference Management
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Solution Overview
Problem
Cooperative multi-point (CoMP) transmission in heterogeneous communications systems faces challenges in implementation and performance improvement due to differences in transmission power, backhaul solutions, and subscriber groups, leading to inadequate interference management and cell-edge performance.
Innovation Solution
The system employs a method where multiple information sources within cooperative sets, including macro and low-power cells, relay nodes, and distributed antenna systems, coordinate transmissions using different resource sets to minimize interference and enhance coverage, allowing for limited cooperation between sets with non-overlapping coverage areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cooperative multi-point transmission is implemented in heterogeneous communications systems, then cell-edge throughput and overall system performance are improved, but implementation complexity increases due to differences in transmission power, backhaul solutions, and subscriber groups
Solution Approach 1:
The patent segments the heterogeneous network into distinct cooperation sets, where each set includes a macro cell and associated low-power nodes (pico cells, femto cells, relay nodes). This segmentation allows CoMP transmission to be implemented independently within each set, managing complexity by treating heterogeneous nodes uniformly within sets while maintaining heterogeneity across the overall network.
Solution Approach 2:
The patent applies local quality by enabling different transmission power levels and backhaul configurations within different cooperation sets. Each set can be optimized for its specific local conditions (e.g., macro cell with pico cells in one set, macro cell with relay nodes in another), allowing tailored CoMP implementation that adapts to local heterogeneity without requiring system-wide uniformity.
2Reliability
If multiple geographically separated signal sources transmit to a single user in heterogeneous systems, then overall communications system performance is improved, but interference management becomes difficult due to varying transmission powers and coverage areas
Solution Approach 1:
The patent divides the network into spatially separated cooperation sets with non-overlapping coverage areas. This segmentation isolates interference within each set, as users in one set receive signals only from nodes in that same set. The segmentation in the frequency domain (different resource sets for different sets) further prevents inter-set interference, allowing reliable CoMP operation despite heterogeneous transmission powers.
Solution Approach 2:
The patent introduces coordination entities that act as intermediaries between macro cells and low-power nodes within cooperation sets. These intermediaries manage the coordination of transmissions, handling the complexity of interference management and power control. The intermediary structure enables effective interference management in heterogeneous systems by centralizing coordination functions.
3Area of stationary object
If cell splitting gain is provided in heterogeneous communications systems, then coverage is improved, but additional work is required to provide desired interference and cell-edge performance
Solution Approach 1:
The patent merges cell splitting with cooperative transmission by forming cooperation sets that include both macro cells and low-power nodes. This combination achieves the coverage benefits of cell splitting while simultaneously providing CoMP transmission to improve cell-edge performance. The merging of these functions into a unified cooperation set structure eliminates the need for separate optimization efforts.
Solution Approach 2:
The patent creates a universal cooperation set structure that can accommodate multiple types of nodes (macro cells, pico cells, femto cells, relay nodes) and support multiple transmission modes (CoMP, traditional cell-edge transmission). This multi-functional structure provides both coverage extension and performance improvement through a single framework, eliminating the need for additional specialized work.
Data Source
AI summary
A system and method for cooperative heterogeneous communications systems are provided. A communications system includes a plurality of cooperation sets, such as closed-space sets. Each closed-space set includes at least two information sources configured to operate cooperatively to transmit to a plurality of communications devices operating within a coverage area of the cooperation set. There is limited cooperation between closed-spaced sets. In addition, there may be limited or no overlap between the coverage areas of the adjacent closed-spaced sets.