Mobile Station Uplink Timing Notification for Base Station Coordination
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Solution Overview
Problem
Conventional soft-handover techniques in mobile communication systems require complex control and simultaneous reception of signals from multiple base stations, complicating packet scheduling and Hybrid Automatic Repeat Request (HARQ) processes, especially when a mobile station needs to receive feedback information from multiple sites.
Innovation Solution
A mobile station and base station system where the mobile station notifies both serving and non-serving base stations of transmission timing, allowing data transmission based on this timing, and the non-serving base station forwards decoded data to the serving base station if no errors are detected, simplifying the reception and retransmission control by relying primarily on the serving base station's signaling channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile station receives downlink signaling channels from multiple base stations simultaneously for soft-handover, then the data rate and frequency efficiency at cell edges are improved, but the control complexity for packet scheduling and HARQ increases
Solution Approach 1:
The patent extracts the feedback information reception function from the mobile station and assigns it to the non-serving base station. The non-serving base station receives feedback information from the mobile station and forwards it to the serving base station, eliminating the need for the mobile station to simultaneously receive feedback channels from multiple base stations while maintaining macro-diversity gain
Solution Approach 2:
The non-serving base station acts as an intermediary by receiving feedback information from the mobile station and forwarding it to the serving base station. This intermediary role simplifies the mobile station's reception requirements while preserving the benefits of multi-base station coordination
2Reliability
If the mobile station receives feedback information from multiple base stations simultaneously, then the handover control is improved, but the reception complexity and resource requirements increase
Solution Approach 1:
The patent extracts the feedback information reception function from the mobile station and assigns it to the non-serving base station. The non-serving base station receives feedback information from the mobile station and forwards it to the serving base station, eliminating the need for the mobile station to simultaneously receive feedback channels from multiple base stations while maintaining macro-diversity gain
Solution Approach 2:
The patent segments the feedback information handling process into distinct roles: the mobile station sends feedback to the non-serving base station, which then forwards it to the serving base station. This segmentation allows the mobile station to maintain simple reception requirements while achieving reliable handover control
Data Source
AI summary
A mobile station, a base station, a mobile communication system and a communication method enabling operations associated with simultaneous uplink reception in multiple stations to be simplified are provided. The base station includes a transmission timing determining unit determining a transmission timing based on scheduling conducted upon a data transmission request from a mobile station and notifying the mobile station of the transmission timing, and a receiving unit receiving data in accordance with the transmission timing.