Base Station Multi-User Scheduling for Frequency-Selective Fading
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Solution Overview
Problem
Existing user scheduling methods in wireless communication systems, such as greedy user selection (GUS) and semi-orthogonal user selection (SUS), are ineffective in frequency bands with frequency selective fading, leading to degraded performance.
Innovation Solution
A method and apparatus for multi-user scheduling in wireless communication systems that considers frequency selectivity by adjusting the number of UEs based on channel state information and frequency selectivity information, using offsets to optimize UE selection and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing user scheduling methods (GUS, SUS) are used, then scheduling simplicity is maintained, but reception performance degrades in frequency selective fading environments
Solution Approach 1:
The patent changes the scheduling parameter from simple channel state information to frequency selectivity information, which characterizes the frequency-dependent characteristics of the channel. By calculating frequency selectivity metrics and using them to adjust the scheduling decision, the system adapts to frequency selective fading conditions while maintaining the basic scheduling framework.
Solution Approach 2:
The scheduling method dynamically adjusts the number of UEs to schedule based on the calculated frequency selectivity. Instead of using a fixed scheduling rule, the system modifies the scheduling decision in real-time according to the observed frequency selectivity conditions, making the scheduling process adaptive to changing channel characteristics.
2Productivity
If the number of scheduled UEs is increased, then system throughput improves, but interference between users increases
Solution Approach 1:
The patent introduces feedback by calculating frequency selectivity information based on channel state information and using this feedback to adjust the number of scheduled UEs. The system monitors the frequency selectivity conditions and adjusts the scheduling decision accordingly, creating a closed-loop control mechanism that balances throughput and interference.
Solution Approach 2:
Instead of scheduling a fixed number of UEs or scheduling all potential users, the patent applies partial action by scheduling only the appropriate number of UEs based on frequency selectivity conditions. When frequency selectivity is high, fewer UEs are scheduled to reduce interference; when frequency selectivity is low, more UEs can be scheduled to increase throughput.
Data Source
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AI summary
The disclosure relates to a wireless communication system, and relates to a method and apparatus for scheduling a plurality of user equipments (UEs) by considering a frequency selectivity. A method, performed by a base station, for transmitting or receiving data in a wireless communication system according to an embodiment includes determining a UE candidate group set based on channel state information for channels of a plurality of carriers, determining an offset used to adjust the number of UEs of the UE candidate group set, based on frequency selectivity information between a representative channel selected from among the channels of the plurality of carriers and other channels, based on the offset, determining a plurality of UEs to which data is to be transmitted, and transmitting the data to the determined plurality of UEs.