Uplink Transmission Rate Control for Mobile Stations
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Solution Overview
Problem
Conventional mobile communication systems face challenges in quickly adjusting the transmission rate of user data in uplinks due to processing load and delay, leading to inefficient use of radio and hardware resources, especially when a mobile station connects to a new cell, resulting in low-speed and high-delay data transmission or wastage of bandwidth resources.
Innovation Solution
A transmission rate control method that notifies the mobile station of a maximum allowable transmission rate when starting communications or switching cells, allowing the station to automatically increase its transmission rate to the notified maximum, enabling rapid adaptation and efficient resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radio network controller RNC integrally controls a plurality of radio base stations Node B to determine transmission rate, then the transmission rate can be determined considering radio resources and interference volume, but the control speed becomes slow due to processing load and delay
Solution Approach 1:
The patent segments the transmission rate control function by separating the determination of maximum allowable transmission rate (performed by RNC considering radio resources and interference) from the actual transmission rate adjustment (performed autonomously by mobile station). This segmentation enables fast control response while maintaining accurate rate determination based on network conditions.
2Productivity
If fast control for changing transmission rate is implemented, then transmission efficiency improves for burst traffic, but costs for implementing apparatus and operating network are substantially increased
Solution Approach 1:
The mobile station autonomously adjusts its transmission rate based on the maximum allowable rate notified by the RNC, without requiring complex control apparatus at the base station. This self-service approach enables fast transmission rate adjustment for burst traffic while avoiding increased implementation and operating costs.
3Device complexity
If control for changing transmission rate is performed slowly on the order from hundreds of ms to seconds, then processing load is reduced, but radio resources are wasted when burst data transmission occurs
Solution Approach 1:
The RNC pre-determines and notifies the mobile station of the maximum allowable transmission rate based on current radio resources and interference conditions. This preliminary action enables the mobile station to immediately utilize available resources when burst traffic occurs, preventing radio resource wastage while keeping processing load distributed.
4Adaptability or versatility
If a mobile station newly connects to a cell, then communication coverage is expanded, but transmission rate increase is delayed due to lack of maximum allowable transmission rate information
Solution Approach 1:
When a mobile station newly connects to a cell, the RNC immediately notifies the mobile station of the maximum allowable transmission rate in advance. This preliminary provision of rate information enables the mobile station to start transmission at optimal rate without delay, maintaining high-speed data transmission capability across cell boundaries.
Data Source
AI summary
A transmission rate control method for controlling a transmission rate of user data transmitted by a mobile station via an uplink, include: notifying, at a radio network controller, a maximum allowable transmission rate of the user data to the mobile station, when the mobile station starts communications or when a cell to which the mobile station is to be connected is changed; and automatically increasing, at the mobile station, the transmission rate of the user data to the maximum allowable transmission rate that is notified by the radio network controller.