Base Station MCS Determination Using Interference Feedback
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Solution Overview
Problem
In wireless communication systems, determining the optimal modulation and coding scheme (MCS) for users in a cloud radio access network (C-RAN) or massive MIMO systems is challenging due to interference and varying channel conditions, leading to suboptimal network performance and increased retransmissions.
Innovation Solution
A method and system at the base station that obtain downlink channel state information (CSI) and receive feedback from user equipment (UEs) on interference and noise power, using a predefined mapping to determine the appropriate MCS for subsets of UEs, thereby mitigating interference and improving channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MCS determination methods are used in C-RAN/massive MIMO systems, then system complexity is reduced, but network performance deteriorates due to interference and suboptimal MCS selection
Solution Approach 1:
The patent implements a feedback mechanism where UEs report interference power and noise power measurements to the base station. The base station uses this feedback along with downlink channel state information to determine optimal MCS for each UE, resolving the contradiction by using structured feedback to improve reliability without excessive complexity
Solution Approach 2:
The patent changes the parameters used for MCS determination from conventional methods to a combination of downlink channel state information and uplink interference/noise power feedback. This parameter change enables more accurate MCS selection that accounts for actual interference conditions, improving network performance while maintaining manageable complexity through standardized feedback procedures
2Productivity
If MCS is determined without considering specific channel conditions, then processing speed is improved, but retransmission rate increases leading to reduced throughput
Solution Approach 1:
The patent performs preliminary MCS determination based on downlink channel state information and uplink interference feedback before actual data transmission. By pre-configuring the optimal MCS for each UE based on current channel conditions, the system avoids retransmissions and improves throughput without significant processing delays during data transmission
3Reliability
If interference mitigation techniques are applied, then channel conditions improve, but system complexity and processing overhead increase
Solution Approach 1:
The patent extracts and separately processes interference and noise power information from uplink signals. By isolating the interference measurement component and using it specifically for MCS determination, the system improves channel condition quality without requiring complex full-duplex interference cancellation, maintaining manageable processing overhead
Data Source
AI summary
Embodiments herein provide method of determining modulation and coding scheme (MCS) at a base station (BS). The method comprises obtaining, by the BS, downlink channel state information (DL-CSI) corresponding to a plurality of UEs. Also, the method comprises receiving feedback from the plurality of UEs, said feedback is at least one of explicit interference power and noise power feedback, post processing signal power-to-interference power plus noise power-based and determining MCS associated with a subset of UEs from the plurality of UEs using a predefined mapping between the MCS and a combination of DL-CSI and the feedback from the plurality of UEs. Further, the method comprises indicating the determined MCS to the subset of UEs from the plurality of UEs.