Multi-Segment Channel Bandwidth Indication and TXOP Protection
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Solution Overview
Problem
Current wireless communication systems, particularly in WLANs, face challenges in effectively indicating channel bandwidth, negotiating channel bandwidth, and protecting transmit opportunity periods (TXOP) for wide bandwidth channels or channels with multiple frequency segments, especially as new standards like IEEE 802.11be aim to support aggregate channels exceeding 160 MHz across different frequency segments or RF bands.
Innovation Solution
The solution involves generating packets with indications of frequency subchannels in multiple frequency segments, allowing simultaneous transmission across these segments, and using integrated circuit devices to manage the wireless network interface for efficient channel management and TXOP protection, including the use of signal fields and service fields within packets to convey bandwidth and punctured subchannel information for negotiation and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aggregation of multiple frequency segments is used to form wide bandwidth channels (e.g., 320 MHz), then data transmission rate is improved, but device complexity increases due to need for multiple packets with frequency segment indications
Solution Approach 1:
The communication channel is divided into multiple frequency segments (e.g., first frequency segment, second frequency segment) that can be independently indicated and transmitted. Each segment is represented by separate packets containing frequency segment indications, allowing the system to manage wide bandwidth channels through modular segmentation rather than monolithic handling.
Solution Approach 2:
The patent introduces a new dimension of frequency segment indication within the packet structure. By adding fields that explicitly indicate which frequency segments are used (e.g., first frequency segment indication, second frequency segment indication), the system gains the ability to represent and manage multi-segment channels without fundamentally altering the basic packet transmission mechanism.
2Productivity
If simultaneous transmission in multiple frequency segments is implemented, then channel utilization is improved, but measurement precision requirements increase for accurate bandwidth indication and negotiation
Solution Approach 1:
The patent implements feedback mechanisms where packets include explicit indications of the frequency segments used for transmission. This feedback information allows receiving devices to accurately determine the bandwidth and segment configuration, enabling precise bandwidth negotiation and adaptation in subsequent transmissions without requiring complex measurements.
Solution Approach 2:
Frequency segment indication fields act as intermediaries between the physical transmission and the control plane. These indication fields serve as standardized mediators that convey bandwidth and segment information reliably, simplifying the measurement and negotiation process by providing direct, unambiguous information about the transmission configuration.
3Reliability
If TXOP protection is extended to multiple frequency segments, then reliability is improved, but loss of time increases due to coordination overhead for bandwidth negotiation
Solution Approach 1:
The patent performs preliminary bandwidth indication and negotiation for each frequency segment before the actual data transmission begins. By establishing the frequency segment allocations and TXOP protections in advance through control packets, the system reduces runtime coordination overhead and minimizes time loss during the actual data transmission phase.
Solution Approach 2:
Multiple frequency segments are merged into a unified TXOP protection framework where a single TXOP can span multiple segments simultaneously. This merging approach allows the system to treat multiple segments as a coordinated unit for protection purposes, reducing the need for separate negotiation and protection procedures for each segment.
Data Source
AI summary
A communication device generates a first packet to include a first indication of one or more first frequency subchannels in a first frequency segment that will be utilized to transmit the first packet. The communication device also generates a second packet to include a second indication of one or more second frequency subchannels in a second frequency segment that will be utilized to transmit the second packet. The communication device simultaneously transmits the first packet via the first frequency segment and the second packet via the second frequency segment.