Power Line Coexistence via Dynamic Frequency Subchannel Allocation
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Solution Overview
Problem
Existing communication systems face challenges in coexisting on the same medium, particularly power lines, due to differing communication schemes and Quality of Service (QoS) requirements, making it difficult to achieve high data rates and low latency simultaneously, especially when using Time Division Multiplexing (TDM) or Frequency Division Multiplexing (FDM).
Innovation Solution
A communication apparatus that generates and transmits a coexistence signal indicating frequency occupancy, allowing for flexible FDM frequency allocation, enabling access and in-home communication systems to coexist while satisfying different QoS requirements by dividing the frequency band into subchannels and using a time-frequency matrix structure for efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Time Division Multiplexing (TDM) is used to allow multiple systems to share the same communication medium, then system coexistence is achieved, but data transmission rate decreases due to time slot allocation overhead
Solution Approach 1:
The frequency band is segmented into multiple subchannels, each capable of carrying independent data streams. This allows different communication systems to operate simultaneously on different frequency segments without requiring time division, thereby maintaining high data rates while enabling system coexistence through frequency-based isolation.
Solution Approach 2:
The patent transitions from time-domain multiplexing (TDM) to frequency-domain multiplexing (FDM) by introducing a frequency dimension for resource allocation. This dimensional shift allows multiple systems to coexist simultaneously in the frequency domain rather than sequentially in time, eliminating the need for time slot overhead and improving overall data transmission efficiency.
2Productivity
If Frequency Division Multiplexing (FDM) is used to allocate different frequency bands to different systems, then data transmission rate increases, but frequency allocation complexity increases
Solution Approach 1:
The patent implements dynamic frequency allocation where the coexistence signal carries information about currently occupied subchannels, allowing the frequency allocation scheme to adapt in real-time to changing traffic conditions. This dynamic approach simplifies allocation complexity by providing automatic frequency selection based on current system state rather than requiring complex pre-planned static allocation.
Solution Approach 2:
The coexistence signal mechanism provides feedback information about frequency band occupancy to all communication systems. This feedback enables automatic frequency selection and avoidance, significantly reducing allocation complexity by allowing systems to autonomously determine available frequencies without complex centralized coordination or pre-planning.
3Productivity
If a coexistence signal is transmitted to indicate frequency occupancy, then frequency allocation efficiency improves, but communication overhead increases
Solution Approach 1:
The coexistence signal is designed to convey essential frequency occupancy information using optimized parameter encoding. By carefully selecting and encoding only the critical parameters needed for frequency allocation decisions, the signal achieves high frequency allocation efficiency while minimizing the amount of overhead data that needs to be transmitted and processed.
4Adaptability or versatility
If the frequency band is divided into multiple subchannels for flexible allocation, then resource allocation flexibility increases, but system complexity increases
Solution Approach 1:
The frequency band is divided into multiple subchannels that can be independently allocated to different communication systems. This segmentation provides fine-grained control over frequency resources, enabling flexible allocation strategies while keeping each individual subchannel relatively simple to manage, thereby achieving high flexibility without proportionally increasing overall system complexity.
Data Source
AI summary
A frequency band is divided into N subchannels. Sub-channels are first allocated for a power line communication system having a higher priority, such as public communication or the like. Sub-channels for a power line communication system having a relatively low priority, such as in-home communication or the like, are allocated from free subchannels. In this case, the subchannels used by the power line communication system having the high priority are limited to a plurality of consecutive subchannels from an upper side or a lower side of the frequency band.