Multi-Link Aggregation CCA Tuning for Adjacent Channel Interference
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Solution Overview
Problem
In wireless communications systems with multi-link aggregation, adjacent channel interference (ACI) occurs due to signal leakage between nearby channels, leading to decreased throughput, increased latency, and lost transmission opportunities.
Innovation Solution
Wireless devices implement techniques such as reducing transmit power, using short interframe spacing bursting, adjusting clear channel assessment (CCA) thresholds, and synchronizing transmissions to mitigate ACI by managing parallel communications across multiple links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel transmissions are performed over multiple adjacent wireless links to increase throughput, then system throughput is improved, but adjacent channel interference causes false busy detection leading to lost transmission opportunities and reduced reliability
Solution Approach 1:
The patent applies preliminary action by performing Clear Channel Assessment (CCA) procedures before initiating transmissions on adjacent wireless links. The transmitting device checks channel availability in advance using CCA with energy detection thresholds, and only proceeds with parallel transmissions when channels are confirmed clear. This prevents false busy detection caused by ACI and ensures reliable transmission opportunities are not lost.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting CCA energy detection thresholds and transmit power levels based on detected ACI conditions. When ACI is detected on adjacent links, the system modifies the CCA threshold parameters to differentiate between actual channel occupancy and ACI-induced energy levels. This allows the system to maintain reliable transmission by adapting parameters to current interference conditions.
2Object-affected harmful factors
If transmit power is reduced on initiating links to lessen ACI impact on adjacent links, then ACI interference is reduced, but transmission reliability and signal quality may deteriorate
Solution Approach 1:
The patent applies dynamics by implementing dynamic transmit power control that adjusts power levels in real-time based on channel conditions and ACI detection. The system monitors ACI levels on adjacent links and dynamically modifies transmit power on initiating links accordingly. When ACI is detected, power is reduced to protect adjacent links; when conditions permit, power is increased to maintain transmission reliability. This dynamic adaptation resolves the contradiction between reducing ACI and maintaining reliability.
3Reliability
If CCA procedures are performed on multiple adjacent links to detect channel availability, then transmission reliability is improved, but ACI causes false busy detection leading to increased latency and lost opportunities
Solution Approach 1:
The patent applies feedback by implementing a closed-loop CCA system that continuously monitors channel energy levels on adjacent links and uses this information to make intelligent transmission decisions. The system performs CCA procedures, detects ACI-induced energy levels, provides feedback about channel conditions, and adjusts subsequent transmission behavior accordingly. This feedback mechanism allows the system to distinguish between true channel occupancy and ACI, reducing false busy detection and associated latency.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting CCA energy detection thresholds based on detected ACI conditions. When ACI is present on adjacent links, the system raises the CCA threshold to prevent false busy detection caused by ACI-induced energy levels. This parameter adaptation maintains reliable channel detection accuracy while reducing false positives that would cause transmission delays and latency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for improved handling of adjacent channel interference in multi-link aggregation scenarios. In accordance with the described techniques, a device may establish a set of wireless links for communication with a second device, the set of wireless links supporting parallel transmission during at least a first duration of a multi-link session, the set of wireless links including at least a first wireless link and a second wireless link. The device may modify a transmission parameter for the first wireless link or a clear channel assessment (CCA) parameter for the second wireless link, or a combination thereof. The device may then perform the CCA procedure on the second wireless link and transmit at least a first portion of the message on the first wireless link based on the modified transmission parameter or modified CCA parameter.