Re-contention Management in Shared Wireless Mediums
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Solution Overview
Problem
In wireless communication systems, especially in shared communication mediums like unlicensed frequency bands, there is a challenge in ensuring efficient coexistence between different Radio Access Technologies (RATs) such as LTE and Wi-Fi, due to potential cross-link interference and the need for contention protocols like Listen Before Talk (LBT), which can lead to inefficiencies in resource utilization and re-contention processes.
Innovation Solution
The implementation of a re-contention strategy using Time Division Duplexing (TDD) frame structures, where access points adjust uplink transmission parameters, mute specific symbol periods, and configure timing advances to create re-contention gaps, allowing for efficient re-access to the communication medium, thereby minimizing contention timer triggers and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen Before Talk (LBT) contention protocol is implemented for coexistence on shared communication medium, then coexistence between different RATs is improved, but resource utilization efficiency deteriorates due to re-contention processes
Solution Approach 1:
The system performs preliminary actions by configuring timing advances and adjusting uplink transmission parameters before potential contention conflicts occur. The base station proactively sets up the re-contention gap and adjusts parameters to prevent contention timer invocations, thereby avoiding the need for actual re-contention processes and improving resource utilization efficiency while maintaining coexistence
Solution Approach 2:
The base station acts as an intermediary by adjusting uplink transmission parameters and configuring timing advances to mediate between different RATs. This intermediary control mechanism allows LTE uplink transmissions to coordinate with Wi-Fi operations, reducing the need for re-contention while maintaining fair coexistence on the shared unlicensed medium
2Productivity
If uplink transmission parameters are adjusted to reduce contention timer triggers, then resource utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The system implements feedback mechanisms where the base station monitors contention timer invocations and adjusts uplink transmission parameters accordingly. By providing feedback on contention behavior and dynamically adapting parameters like timing advances and transmission power, the system reduces resource waste from re-contention while managing complexity through automated closed-loop control
3Reliability
If re-contention gaps are configured to allow efficient re-access, then coexistence is improved, but loss of time increases due to transmission interruptions
Solution Approach 1:
The system dynamically changes parameters by adjusting timing advances and configuring the duration and positioning of re-contention gaps based on traffic conditions and contention patterns. By optimizing these parameters, the system minimizes transmission interruptions while ensuring sufficient gaps are available for efficient re-access and coexistence with other RATs
Data Source
AI summary
Techniques for managing re-contention on a shared communication medium are disclosed. In order to facilitate re-contending for access to the communication medium, an access point may adjust one or more uplink transmission parameters associated with a triggering condition for invoking a contention timer. In addition or as an alternative, the access point may mute transmission on the communication medium during one or more symbol periods designated for transmission. In addition or as an alternative, the access point may configure a timing advance to create a re-contention gap.