Mobile Station State Transition for HSUPA Uplink
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Solution Overview
Problem
In mobile communication systems using Enhanced Uplink (EUL) or High Speed Uplink Packet Access (HSUPA) schemes, mobile stations cannot shift to a second communication state where they perform high speed uplink packet communication using a high speed uplink packet communication compliant radio link, even when moving to a cell controlled by a base station compliant with both HSDPA and EUL communications, due to lack of defined triggers for this transition.
Innovation Solution
The system introduces triggers for mobile stations to shift from a first communication state to a second communication state based on the establishment of high speed uplink packet communication compliant radio links, excess data in the transmission buffer, elapsed time, and available resources at the base station, allowing the mobile station to utilize high speed uplink packet communication compliant radio links for both downlink and uplink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile station uses a non EUL compliant base station for uplink communication, then the mobile station can maintain connection with HSDPA compliant base stations, but the mobile station cannot perform high speed uplink packet communication
Solution Approach 1:
The mobile station dynamically switches between first communication state (using non EUL compliant radio link) and second communication state (using EUL compliant radio link) based on the availability of EUL compliant base stations and system conditions. This dynamic state transition enables the mobile station to adapt its uplink communication mode to maximize speed while maintaining compatibility across different base station types.
Solution Approach 2:
The system changes the communication state parameter of the mobile station from the first communication state to the second communication state when an EUL compliant radio link is established. This parameter change triggers the transition from standard uplink packet communication to high speed uplink packet communication, resolving the contradiction between speed and compatibility.
2Adaptability or versatility
If the mobile station is in the first communication state, then the mobile station can connect to non EUL compliant base stations, but the mobile station cannot transition to the second communication state even when moving to EUL compliant base stations due to lack of defined triggers
Solution Approach 1:
The system establishes the EUL compliant radio link in advance (first action) before transitioning the mobile station to the second communication state. This preliminary establishment of the radio link provides a clear trigger condition that enables the state transition without requiring complex real-time decision-making, thus improving adaptability while controlling complexity.
Solution Approach 2:
The system uses feedback from the radio link establishment status to trigger the communication state transition. When the mobile station successfully establishes an EUL compliant radio link with an EUL compliant base station, this feedback signal automatically triggers the transition from the first communication state to the second communication state, providing a simple and effective control mechanism.
Data Source
AI summary
A mobile communication system is configured as a mobile station in a first communication state shifts to a second communication state when at least one high speed uplink packet communication compliant radio link is established by the mobile station.