Dynamic Contention Window Adjustment for LAA Uplink Reliability
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Solution Overview
Problem
In Licensed Assisted Access (LAA) wireless communication, existing technologies face challenges in avoiding channel conflicts during uplink transmissions on unlicensed frequency bands, particularly due to the variability in success rates of Listen-Before-Talk (LBT) processes, which can lead to reception conflicts with other communication devices.
Innovation Solution
An electronic device and method for adjusting the contention window size of user equipment based on the success rate of uplink transmission on unlicensed frequency bands, using a random back-off process with a variable contention window size to optimize channel access and reduce conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen-Before-Talk with random back-off process is performed on unlicensed frequency band, then channel conflict with other communication apparatus is avoided, but reception conflict occurs due to variability in success rates
Solution Approach 1:
The base station monitors the success rate of uplink transmissions from user equipment on the unlicensed frequency band and uses this feedback information to dynamically adjust the contention window size. When the success rate falls below a threshold, the base station increases the contention window size to reduce collisions and improve reliability, thereby eliminating reception conflicts.
Solution Approach 2:
The contention window size parameter is dynamically changed based on the observed transmission success rate. The base station adjusts this parameter to optimize channel access probability and minimize reception conflicts, transforming a static parameter into a dynamically adaptable one that responds to channel conditions.
2Reliability
If contention window size is increased to reduce reception conflict, then transmission reliability improves, but channel access time increases
Solution Approach 1:
The contention window size is made dynamic rather than fixed, allowing the system to adapt to changing channel conditions. When transmission success rates are high, the contention window size is kept smaller to enable faster channel access. When success rates drop due to conflicts, the window size increases to reduce collisions, thus balancing access time and reliability based on real-time conditions.
Solution Approach 2:
The system uses feedback from transmission success rates to continuously optimize the contention window size. This feedback mechanism ensures that the parameter is adjusted to the minimum necessary value to maintain reliability, avoiding excessive delays while still preventing reception conflicts when they occur.
3Reliability
If base station monitors and adjusts contention window size dynamically, then transmission success rate improves, but system complexity increases
Solution Approach 1:
The base station autonomously monitors transmission success rates and automatically adjusts contention window sizes without requiring complex external control systems. The system serves itself by using its own observations of channel conditions to make parameter adjustments, simplifying the overall system architecture while maintaining high reliability.
Data Source
AI summary
An electronic device, information processing apparatus, and information processing method. The electronic device at a base station side includes a processor circuit. The processor circuit is configured to acquire information related to a success rate of uplink transmission in an unlicensed frequency band of at least one user equipment unit, wherein the user equipment unit employs a channel detection process to perform carrier sensing on the unlicensed frequency band, and the channel detection process includes a random back-off process having a variable contention window size. The processor circuit is further configured to adjust, based on the information, the contention window size of the user equipment unit. The processor circuit is further configured to perform control, such that the user equipment unit is notified of the adjusted contention window size or a value of a random back-off counter generated on the basis of the adjusted contention window size.