Multi-transceiver Channel Multiplexing for Wireless Video Surveillance
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Solution Overview
Problem
The existing wireless video surveillance networks using the IEEE 802.11ah standard face low throughput and high delay due to limited bandwidth, especially when transmitting multiple high-definition video streams, which fails to meet Quality of Service (QoS) requirements.
Innovation Solution
A multi-transceiver channel multiplexing method that configures multiple transceivers on an access point to operate on sub-channels of varying bandwidths (1-MHz, 2-MHz, 4-MHz, and 8-MHz) to optimize channel allocation and modulation schemes based on received signal quality and data volume, allowing parallel transmissions and improved data transfer rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single transceiver operates on an 8-MHz channel according to IEEE 802.11ah standard, then device complexity is reduced and ease of operation is improved, but network throughput decreases and delay increases due to limited bandwidth
Solution Approach 1:
The 8-MHz channel is segmented into multiple sub-channels (1-MHz, 2-MHz, 4-MHz sub-channels), and multiple transceivers are configured to operate in parallel on these sub-channels. This segmentation allows the system to achieve higher aggregate throughput by distributing traffic across multiple narrower channels, resolving the contradiction between throughput and complexity through structured channel division
Solution Approach 2:
The patent transitions from a single-dimensional channel approach (one 8-MHz channel) to a multi-dimensional approach by introducing frequency division multiplexing across multiple sub-channels with different bandwidths. This dimensional expansion in the frequency domain enables simultaneous parallel transmissions, achieving higher throughput while maintaining manageable complexity through standardized sub-channel configurations
2Quantity of substance
If multiple high-definition video streams are transmitted concurrently on an 8-MHz channel, then service coverage is expanded, but network load reaches saturation and QoS requirements cannot be met
Solution Approach 1:
Video streams are segmented and assigned to different sub-channels based on channel quality and stream requirements. Multiple transceivers handle different sub-channels simultaneously, allowing the system to support more video streams without saturating any single channel, thus maintaining QoS requirements through distributed load handling
Solution Approach 2:
The system dynamically adjusts channel bandwidth parameters (selecting from 1-MHz, 2-MHz, 4-MHz sub-channels) based on signal quality and traffic demands. This parameter flexibility allows optimal allocation of resources to maintain QoS for multiple concurrent video streams while maximizing throughput
3Area of stationary object
If low-rate modulation and coding scheme is used for distant STAs, then coverage area is expanded, but data rate decreases to 1/4 of 64-QAM and network throughput significantly decreases
Solution Approach 1:
Different sub-channels are assigned to different STAs based on their specific channel conditions and distance from the AP. Distant STAs with poor signal quality are assigned to narrower sub-channels (1-MHz or 2-MHz) where they can maintain more reliable connections, while closer STAs with better signal quality utilize wider sub-channels (4-MHz or 8-MHz) for higher throughput. This local optimization resolves the contradiction by matching channel characteristics to specific user needs
Data Source
AI summary
A multi-transceiver configuration method, a multi-transceiver channel multiplexing method, and an apparatus are disclosed. The multi-transceiver configuration method includes: an access point obtains maximum data transfer rates Ri(n) of N terminals STAis on sub-channels n in a specified sub-channel combination, where 1≤i≤N, and N is a positive integer greater than 1; and calculates a channel access time Ti(n) required by the STAi for transmitting an average data volume on the sub-channel n, and when the specified sub-channel combination manner meets an allocation requirement of the N STAis, the access point configures at least one transceiver for each sub-channel n in the specified sub-channel combination.