Range Expansion in Heterogeneous Wireless Networks
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Solution Overview
Problem
Wireless communication networks face interference and congestion due to increased demand for mobile broadband access, leading to sub-optimal performance in heterogeneous networks where UEs are served by multiple base stations with varying signal strengths.
Innovation Solution
A method and apparatus that process signal strength differences between UE communications with different classes of base stations to schedule UEs in a range expansion mode, enabling them to receive communications from lower-powered base stations on resources coordinated with higher-powered stations, thereby reducing interference and enhancing network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more UEs access the network simultaneously, then network capacity increases, but interference and congestion worsen
Solution Approach 1:
The patent segments the network into different base station classes (macro and pico/femto eNodeBs) and applies different resource allocation strategies to each. By dividing the network infrastructure into hierarchical levels with distinct characteristics, the system can manage interference differently for each segment while collectively increasing overall network capacity.
Solution Approach 2:
The patent applies local quality by treating different base station classes differently in terms of resource coordination. Macro eNodeBs and pico/femto eNodeBs have different transmission power levels and interference characteristics, so the system applies tailored resource allocation and interference mitigation strategies specific to each local network element rather than a uniform approach.
2Area of stationary object
If UEs are served by multiple base stations with varying signal strengths, then coverage is improved, but performance becomes sub-optimal
Solution Approach 1:
The patent implements dynamic resource coordination where the eNodeB continuously monitors signal strength differences and adjusts resource allocation dynamically. When a UE reports signal strength differences indicating potential handover conditions or interference issues, the system dynamically reconfigures resource blocks and transmission parameters to maintain optimal performance while preserving expanded coverage.
Solution Approach 2:
The patent employs feedback mechanisms where UEs report their signal strength measurements to the eNodeB, which then uses this information to make informed resource allocation decisions. This closed-loop feedback system enables the network to adapt to changing signal conditions and maintain reliable communication performance across expanded coverage areas.
3Object-affected harmful factors
If resource coordination is implemented between base stations, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent merges the resource coordination function into the existing eNodeB architecture rather than creating a separate complex coordination system. By combining interference mitigation activities with the base station's existing scheduling and resource management functions, the system reduces downlink interference while avoiding the complexity of entirely separate coordination mechanisms.
Solution Approach 2:
The patent implements self-service by enabling the eNodeB to autonomously make resource allocation decisions based on UE reports and network conditions. The base station independently monitors signal strength differences, evaluates handover conditions, and adjusts resources without requiring complex centralized control, thereby reducing interference while keeping the system relatively simple.
Data Source
AI summary
For range expansion, a determination to enter range expansion may be made based on a signal strength differential for user equipment (UE) communications between a first class of base stations and a second class of base stations. If the signal strength differential is beyond a certain threshold, range expansion may be implemented. In range expansion, a signal is transmitted, on a resource coordinated with at least one of the first class of base stations, from one of the second class of base stations to the UE which could experience dominant interference from one of the first class of base stations if coordination were not performed. Transmission power may be reduced from one of the first class of base stations on that resource. The second signal may be transmitted within the region of the Physical Downlink Shared Channel.