TXOP Sharing Across Primary and Secondary Bandwidth Parts
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing TXOP sharing across multiple bandwidth parts due to synchronization delays and inefficiencies in channel access, particularly when APs operate on non-overlapping secondary bandwidth parts.
Innovation Solution
An access point (AP) operates on a primary bandwidth part using carrier sensing and scans secondary bandwidth parts for control messages without performing carrier sensing, allowing it to detect and share TXOPs with other APs on those parts, facilitating coordinated channel access and resource sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If APs perform carrier sensing on primary bandwidth part and scan secondary bandwidth parts without active sensing, then channel access efficiency is improved and synchronization delays are reduced, but channel access coordination complexity increases
Solution Approach 1:
The patent divides the bandwidth part into primary and secondary segments, where carrier sensing is performed on the primary bandwidth part and scanning is performed on secondary bandwidth parts. This segmentation allows APs to efficiently access channels by focusing active sensing on the primary part while passively monitoring secondary parts, thereby improving channel access efficiency without requiring full active sensing across all bandwidth parts.
Solution Approach 2:
The patent introduces control messages as intermediaries that carry TXOP reservation information between APs. These control messages enable coordinated TXOP sharing by allowing APs to detect and respond to reservations on secondary bandwidth parts without performing active carrier sensing, thus reducing synchronization delays while managing coordination complexity through structured message exchange.
2Device complexity
If APs perform full carrier sensing on all bandwidth parts, then channel access coordination is simplified, but synchronization delays increase and channel access efficiency deteriorates
Solution Approach 1:
By segmenting the bandwidth part into primary and secondary components, the patent enables APs to perform carrier sensing only on the primary bandwidth part while scanning secondary parts for control messages. This segmentation eliminates the need for time-consuming full carrier sensing on all bandwidth parts, thereby reducing synchronization delays without completely sacrificing coordination capability.
Solution Approach 2:
The patent implements preliminary scanning of secondary bandwidth parts for control messages before attempting channel access. This preliminary action allows APs to detect TXOP reservations in advance on secondary bandwidth parts, reducing synchronization delays by avoiding late-stage detection and coordination conflicts that would occur with full carrier sensing approaches.
3Ease of manufacture
If APs use distributed channel access (DCF) in unlicensed bands, then implementation simplicity is maintained, but channel usage efficiency deteriorates under high load conditions
Solution Approach 1:
The patent merges the simplicity of distributed channel access with coordinated TXOP sharing by allowing APs to detect control messages from other APs on secondary bandwidth parts. This combination maintains the ease of implementation of distributed access while improving channel usage efficiency through coordination, as APs can avoid collisions by detecting reservations without requiring complex centralized control mechanisms.
Solution Approach 2:
The patent introduces feedback through control messages that carry TXOP reservation information between APs. This feedback mechanism allows APs to adjust their channel access behavior based on detected reservations, thereby improving channel usage efficiency under high load conditions while maintaining the distributed nature of the system and avoiding the complexity of fully centralized control.
4Adaptability or versatility
If multiple APs contend for channel access independently, then device autonomy is maintained, but collision probability increases and channel usage deteriorates
Solution Approach 1:
The patent uses control messages as intermediaries to enable APs to detect TXOP reservations from other APs on secondary bandwidth parts. This intermediary mechanism maintains device autonomy by allowing each AP to independently make access decisions based on detected information, while simultaneously reducing collision probability through awareness of other APs' reservations, thus improving reliability without sacrificing autonomy.
Solution Approach 2:
The patent implements self-service by allowing APs to autonomously detect control messages and adjust their channel access behavior accordingly. Each AP independently monitors secondary bandwidth parts for reservations and makes its own access decisions, maintaining device autonomy while reducing collisions through self-adjustment based on detected information from other APs.
Data Source
AI summary
Channel access coordination for TXOP sharing An access point of a wireless communication system operates on a primary bandwidth part 5 (Ch2, Ch3) of a medium. This operation on the primary bandwidth part (Ch2, Ch3) is based on carrier sensing to gain access to the primary bandwidth part of the medium. Further, the access point scans a secondary bandwidth part (Ch1, Ch2) of the medium to detect control messages transmitted on the secondary bandwidth part (Ch1, Ch2), without performing carrier sensing to gain access to the secondary bandwidth part (Ch1, Ch2) of the medium. Further, the AP 10 detects a control message indicating that another AP reserved a transmission opportunity, TXOP, on the secondary bandwidth part (Ch1, Ch2) of the medium. In response to the control message, the AP cooperates with the other AP by sharing the TXOP for performing one or more transmissions of data. 15