Dynamic RLC Flow Control for MRAB Call Stability
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Solution Overview
Problem
MRAB calls in wireless communication systems experience a higher dropped call rate compared to voice calls due to poor management of resources, especially in poor radio frequency conditions, leading to unstable connections and dropped calls.
Innovation Solution
The wireless terminal dynamically adjusts RLC flow control parameters such as max reset timers, RLC window sizes, poll timers, and status timers based on RF conditions like block error rate and re-transmissions to prevent unnecessary RLC resets and maintain connections in adverse conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RLC flow control parameters are kept at default values, then the system operation is simple, but the connection stability deteriorates in poor RF conditions leading to dropped calls
Solution Approach 1:
The patent implements dynamic adjustment of RLC flow control parameters based on detected RF conditions. The system transitions from static default parameters to dynamic parameters that adapt to changing radio frequency environments, thereby maintaining connection stability without requiring complex manual configuration
Solution Approach 2:
The system performs self-configuration by automatically detecting RF conditions and adjusting RLC parameters without external intervention. The wireless terminal autonomously monitors block error rates and re-transmissions, then modifies parameters such as max reset timers and RLC window sizes to maintain reliable connections
2Reliability
If RLC resets are performed frequently to handle errors, then error recovery is improved, but the connection stability deteriorates causing dropped calls
Solution Approach 1:
The patent changes the timing and frequency parameters of RLC resets by adjusting max reset timers and poll timers based on RF conditions. This modifies the reset behavior to be less frequent and more controlled, preventing unnecessary resets that cause connection drops while still enabling error recovery when needed
Solution Approach 2:
The system takes preliminary action by detecting deteriorating RF conditions (increased block error rates, re-transmissions) and proactively adjusting parameters before critical failures occur. This prevents the need for frequent emergency resets by maintaining parameters that anticipate and mitigate error conditions
3Reliability
If RLC window sizes are reduced to improve flow control, then data transmission reliability is improved, but the data transmission speed deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of RLC window sizes based on detected RF conditions. The window size transitions from static to dynamic, expanding when RF conditions are good to maximize throughput and contracting when conditions deteriorate to maintain reliability, thereby resolving the speed-reliability tradeoff
Data Source
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AI summary
Systems, devices, and methods for wireless enhanced uplink (UL) radio link control (RLC) flow control for multi-radio access bearer (MRAB) calls. In one aspect, a device configured to manage a wireless connection in a voice and data communication is provided. The device includes a receiver configured to receive radio link control (RLC) control information. The device further includes a controller configured to detect one or more radio frequency (RF) conditions. The controller is further configured to dynamically adjust, independent of the received RLC control information, RLC flow control in response to the RF conditions.