Coordinated Rank Scheduling in Multi-Cell Systems
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Solution Overview
Problem
In multi-cell communication systems, terminals on the edge of cells experience interference from neighboring base stations due to lack of inter-cell coordination, leading to suboptimal performance and increased interference.
Innovation Solution
The method involves a master-slave architecture where base stations coordinate to perform adaptive scheduling based on a 'coordinated rank' that maximizes or minimizes terminal performance, using Proportional Fair scheduling in the frequency domain, and adjusting scheduling priorities based on whether the coordinated rank is recommended or restricted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If inter-cell coordination is not performed, then device complexity is reduced, but terminals on cell edge experience increased interference and suboptimal performance
Solution Approach 1:
The patent merges scheduling decisions across multiple base stations by introducing a master base station that coordinates with slave base stations. The master base station determines transmission ranks and schedules terminals based on coordinated rank information from multiple cells, effectively combining the scheduling functions to reduce inter-cell interference while maintaining manageable complexity through hierarchical organization.
2Reliability
If adaptive scheduling based on coordinated rank is implemented, then terminal performance is improved, but feedback overhead increases
Solution Approach 1:
The patent extracts only the essential coordinated rank information needed for scheduling decisions from the full channel state information. Instead of feeding back complete channel matrices or all possible rank indicators, terminals feed back only the coordinated rank that is most relevant for multi-cell coordination, significantly reducing feedback overhead while maintaining the ability to improve terminal performance through adaptive scheduling.
3Manufacturing precision
If coordinated multiple point transmission is performed, then link adaptation is enhanced, but sensitivity to channel estimation errors increases
Solution Approach 1:
The patent changes the parameter used for scheduling from traditional channel quality indicators to coordinated rank information. By basing scheduling decisions on the coordinated rank (which indicates the preferred transmission rank considering multi-cell interference conditions) rather than raw channel estimation values, the system achieves better link adaptation while reducing sensitivity to channel estimation errors, as the rank selection is more robust to estimation variations.
Data Source
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AI summary
An adaptive scheduling method and apparatus that adaptively perform scheduling based on a coordinated rank in a multi-cell communication system are provided. A master base station may schedule, with a first priority, master terminals, each of which has a preferred rank equal to a transmission rank of the master base station, and may transmit, to a slave base station, information associated with a group of scheduled master terminals. The slave base station may schedule, with different priorities, slave terminals based on whether a transmission rank of the slave base station is equal to the coordinated rank for the master base station.