WLAN Coexistence: Primary TX and Auxiliary RX Chain Management
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Solution Overview
Problem
Wireless Local Area Network (WLAN) devices face challenges in coexistence between primary transmission/reception chains and auxiliary reception chains due to signal leakage, which affects the evaluation of alternative communication channels and compliance with regulatory requirements such as radar signal detection and Channel Availability Check (CAC).
Innovation Solution
A WLAN device operates in two modes: prioritizing transmission for primary chains and reception for the auxiliary chain, with mechanisms like deactivating the auxiliary chain during primary transmission, limiting transmission duty cycles, and reducing transmit power to mitigate leakage, allowing parallel evaluation of alternative channels and normal operation on the primary channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the auxiliary RX chain operates continuously to evaluate alternative channels, then channel evaluation capability is improved, but signal leakage from primary TX chains degrades reception quality
Solution Approach 1:
The system dynamically switches between two operational modes: In mode 1, the auxiliary RX chain is deactivated during primary TX transmission to eliminate signal leakage; in mode 2, the auxiliary RX chain operates to evaluate alternative channels. This dynamic switching resolves the contradiction by adapting the system state based on operational requirements.
Solution Approach 2:
The WLAN device alternates between mode 1 and mode 2 in periodic cycles. During mode 1 periods, primary transmission occurs with auxiliary reception deactivated; during mode 2 periods, auxiliary channel evaluation occurs with limited primary transmission. This periodic alternation allows both functions to operate at different times, resolving the signal leakage conflict.
2Reliability
If transmission duty cycle is limited to permit auxiliary RX operation, then coexistence is improved, but transmission throughput decreases
Solution Approach 1:
Instead of completely disabling primary transmission, the system applies partial action by limiting the transmission duty cycle to a predefined ratio that allows auxiliary RX operation. This partial transmission approach maintains some productivity while enabling coexistence, rather than choosing complete disablement or full transmission.
Solution Approach 2:
The transmission duty cycle is dynamically adjusted based on the operational mode. In mode 1, transmission can occur at full duty cycle; in mode 2, the duty cycle is dynamically limited to permit auxiliary RX operation. This dynamic adjustment resolves the contradiction between reliability and productivity.
3Object-affected harmful factors
If transmit power is reduced to enable auxiliary RX coexistence, then signal leakage is mitigated, but transmission power decreases
Solution Approach 1:
The system changes the transmit power parameter dynamically based on operational mode. In mode 1, transmit power can be at full level; in mode 2, transmit power is reduced to a level that permits coexistence with auxiliary RX operation. This parameter change resolves the contradiction between mitigating signal leakage and maintaining transmission power.
4Reliability
If primary TX chains transmit continuously, then transmission reliability is improved, but auxiliary RX chain cannot evaluate alternative channels
Solution Approach 1:
The system implements periodic alternation between mode 1 (primary transmission priority) and mode 2 (auxiliary reception priority). During mode 1 periods, primary TX chains transmit with high reliability; during mode 2 periods, the auxiliary RX chain evaluates alternative channels. This periodic action ensures both functions receive adequate operational opportunities.
Solution Approach 2:
The system dynamically switches between operational modes to balance transmission reliability and channel evaluation capability. In mode 1, the system optimizes for transmission reliability; in mode 2, it optimizes for channel evaluation. This dynamic switching resolves the contradiction by adapting to different operational requirements.
Data Source
AI summary
A method includes, in a Wireless Local Area Network (WLAN) device that includes one or more primary transmission/reception (TX/RX) chains and an auxiliary reception (RX) chain, defining a first operational mode in which priority is given to transmission of the primary TX/RX chains, and a second operational mode in which the priority is given to reception of the auxiliary RX chain. communication is performed on a given communication channel using the primary TX/RX chains, and evaluation of signal activity is performed on one or more alternative communication channels using the auxiliary reception (RX) chain, while operating the WLAN device alternately in the first and second operational modes.