UMTS Enhanced Uplink Hysteresis Control for Rate Stability
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Solution Overview
Problem
The existing UMTS Enhanced Uplink transmission rate control scheme experiences toggling issues between serving and non-serving base stations, leading to inefficient use of downlink resources and suboptimal transmission rates due to frequent signaling and hysteresis period limitations.
Innovation Solution
A method and system that allow non-serving base stations to terminate hysteresis periods initiated by them, enabling dynamic adjustment of transmission rates in response to changing interference levels, without requiring repeated '−1' commands, by using a '+1' command to terminate the hysteresis period and allowing the serving base station to increase the transmission rate when conditions improve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a hysteresis period is used to prevent toggling, then transmission rate stability is improved, but the transmission rate is reduced below necessary levels when interference conditions change
Solution Approach 1:
The patent makes the hysteresis period dynamic by allowing it to be terminated early when the non-serving base station's interference level changes. Instead of a fixed predetermined period, the hysteresis duration adapts based on current channel conditions, enabling the system to switch from stable but conservative rate control to responsive rate optimization when conditions permit.
Solution Approach 2:
The patent changes the parameter of hysteresis period duration from a fixed value to a variable that can be terminated early. The termination condition is triggered when the non-serving base station transmits a specific signal indicating improved interference conditions, allowing the effective hysteresis period to be shortened based on real-time parameter changes in the communication environment.
2Stability of the object's composition
If non-serving base stations transmit −1 commands continually to prevent toggling, then transmission rate stability is improved, but downlink signaling resources are wasted
Solution Approach 1:
Instead of continuous −1 transmission, the patent uses periodic or event-triggered signaling where the non-serving base station transmits a termination signal only when interference conditions change. This transforms the continuous signaling approach into an event-driven periodic action, reducing overall signaling overhead while maintaining rate stability.
Solution Approach 2:
The patent introduces a feedback mechanism where the non-serving base station monitors its own interference conditions and provides feedback signals to the mobile station. When the interference level becomes acceptable, the non-serving base station sends a termination signal, creating a closed-loop control system that reduces signaling waste while maintaining stability.
3Loss of energy
If the hysteresis period is extended to reduce downlink signaling, then signaling resources are conserved, but the transmission rate is maximally reduced
Solution Approach 1:
The patent makes the hysteresis period dynamic rather than extended and fixed. The effective duration adapts based on channel conditions, allowing the system to use shorter hysteresis periods when interference conditions improve, thereby recovering transmission rate without proportionally increasing signaling overhead.
Data Source
AI summary
A mobile station (100) in a mobile communication system obeys commands received from a serving base station (300) to decrease its transmission rate, and obeys commands received from the serving base station (300) to increase its transmission rate except when a predetermined time period is in progress. It obeys commands received from a non-serving base station (200, 400) to decrease its transmission rate, it initiates the predetermined time period in response to receiving such commands, and it terminates the predetermined time period in response to a further command from the same non-serving base station (200, 400).