Wireless Backoff Channel Selection for BSS Subchannels
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Solution Overview
Problem
Current wireless communication systems face challenges in managing medium synchronization and throughput, particularly in high-bandwidth applications like video teleconferencing and HD video surveillance, due to communication collisions and inefficient use of subchannels in WLAN networks.
Innovation Solution
The implementation of a method and apparatus that selects and announces backoff channels for subchannels of a Basic Service Set (BSS) operating channel, allowing for dynamic switching between primary and non-primary subchannels, and allocating different priorities to these channels to optimize resource utilization and avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backoff techniques are used to reduce communication collisions, then reliability is improved, but productivity decreases due to transmission delays
Solution Approach 1:
The BSS operating channel is segmented into multiple subchannels (primary and non-primary), each with its own backoff channels. This segmentation allows devices to perform backoff on one subchannel while simultaneously transmitting on another, eliminating the trade-off between reliability and productivity by enabling parallel operations across divided frequency resources.
Solution Approach 2:
The patent introduces a frequency dimension to the backoff process by allocating separate backoff channels within different subchannels. Instead of sequential backoff on a single channel, devices can operate in multiple frequency dimensions simultaneously, achieving both collision avoidance and maintained throughput through spatial-frequency diversity.
2Ease of operation
If devices use only the primary subchannel for backoff, then ease of operation is improved, but productivity decreases when primary subchannel is busy due to neighbor BSS transmissions
Solution Approach 1:
The patent implements dynamic subchannel selection for backoff operations. Devices can dynamically switch between primary and non-primary subchannels based on channel availability and neighbor BSS transmission states. This dynamic adaptation maintains operational simplicity through standardized procedures while eliminating throughput losses by selecting alternative subchannels when the primary is occupied.
3Productivity
If multiple subchannels are used for backoff, then productivity is improved by avoiding collisions, but device complexity increases
Solution Approach 1:
The patent creates a universal backoff mechanism that operates across multiple subchannels using the same standardized procedures. The backoff algorithm, channel selection logic, and transmission protocols remain uniform whether operating on primary or non-primary subchannels. This multi-functionality approach enables improved throughput through diverse frequency resources while avoiding increased device complexity by maintaining procedural consistency.
Data Source
AI summary
Embodiments of a method and apparatus for wireless communications are disclosed. In an embodiment, a device includes a controller configured to select backoff channels of subchannels of a Basic Service Set (BSS) operating channel and a wireless transceiver configured to announce to a second device the backoff channels of the subchannels of the BSS operating channel for use in communicating between the device and the second device, where the subchannels include a primary subchannel and at least one non-primary subchannel.