Coordinated HSDPA Scheduling for Overlap Area Signal Power
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Solution Overview
Problem
The existing HSDPA scheduling technique cannot effectively increase signal power for mobile terminals in areas of overlap between cells, as scheduling is managed independently at each station and does not adapt well to soft handover processes.
Innovation Solution
A method for scheduling during a transmission time slot involves creating lists of active terminals, selecting terminals based on radio link quality, and commanding simultaneous transmission from all connected stations to increase signal power and reduce intercellular interference, using opportunistic scheduling algorithms to ensure fair access and adapt to changing radio conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent scheduling is used at each transmitting station, then scheduling flexibility and adaptability to local conditions are improved, but signal power in overlap areas between cells deteriorates
Solution Approach 1:
The patent merges the scheduling functions of multiple transmitting stations into a single coordinated scheduling mechanism. The network controller consolidates information from multiple stations and makes unified scheduling decisions, causing the stations to transmit simultaneously to terminals in overlap areas, thereby increasing signal power while maintaining scheduling adaptability.
2Reliability
If soft handover is implemented, then signal reliability in overlap areas is improved, but system complexity increases due to multiple simultaneous transmissions
Solution Approach 1:
The patent introduces a network controller as an intermediary that manages soft handover between transmitting stations. This mediator consolidates scheduling decisions and coordinates transmissions, reducing the complexity burden on individual stations and terminals while maintaining the reliability benefits of soft handover through centralized control.
3Productivity
If time-division multiplex access is used, then network capacity and data rates are improved, but signal power in overlap areas deteriorates due to independent scheduling
Solution Approach 1:
The patent introduces dynamic coordination between transmitting stations based on terminal location and radio conditions. The network controller dynamically adjusts transmission timing and power allocation, enabling simultaneous transmissions to overlap area terminals when needed, while maintaining time-division multiplex access for other scenarios, thus preserving network capacity while improving signal power where required.
Data Source
AI summary
A scheduling method for a time division multiplex time slot including: establishing a first list of terminals to transmit and connected to one or more stations; while the first list contains one or more terminals: selecting a terminal from the first list; adding the selected terminal to a second list; determining two or more stations to which the selected terminal is connected, and if the first list contains one or more other terminals also connected to the determined stations, deleting the other terminal(s) from the first list; when the first list is empty, commanding transmission during the time slot to terminals of the second list; and if a terminal from the second list is connected to at least two stations, commanding transmission from the two stations.