CoMP Scheduler UE Grouping for Interference Management
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in optimizing modulation and coding schemes (MCS) and rank selection for user equipment (UEs) served by multiple geographically separated base stations, due to interference issues which affect data transmission efficiency.
Innovation Solution
A coordinated multipoint (CoMP) scheduler partitions UEs into groups based on interference levels and assigns appropriate MCS and rank selection, providing indications to base stations for improved communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CoMP transmission is used to serve multiple UEs simultaneously, then spectral efficiency and data transmission capacity are improved, but interference between UEs increases and becomes difficult to manage
Solution Approach 1:
The patent segments UEs into different groups based on their interference characteristics and channel conditions. Each group is assigned specific time-frequency resources and transmission parameters, allowing the system to simultaneously serve multiple groups with different interference profiles without mutual interference degradation.
Solution Approach 2:
The patent applies local quality by assigning different transmission parameters (MCS, rank, power allocation) to different UE groups based on their specific channel conditions and interference environments. This allows optimization of transmission quality for each local group while managing overall system interference.
2Reliability
If multiple base stations transmit to the same UE simultaneously, then reliability and data rate are improved, but coordination complexity and signaling overhead increase
Solution Approach 1:
The patent segments the coordination function by designating specific base stations as lead nodes for different UE groups, reducing the coordination burden on all base stations. Each lead station manages a subset of UEs, simplifying the overall coordination architecture while maintaining reliable multi-point transmission.
Solution Approach 2:
The patent inverts the traditional coordination approach by having UEs report their preferred transmission parameters (MCS, rank) directly to the scheduler, rather than having the scheduler determine all parameters centrally. This distributes some decision-making authority and reduces coordination complexity.
3Productivity
If interference-based UE grouping is implemented, then spectral efficiency is improved, but computational complexity for scheduling increases
Solution Approach 1:
The patent implements partial grouping by creating a limited number of UE groups (e.g., 2-4 groups) based on dominant interference patterns, rather than optimizing group assignments for all possible UE combinations. This achieves most of the spectral efficiency benefit while significantly reducing computational complexity.
Solution Approach 2:
The patent enables UEs to self-report their channel quality indicators (CQI) and interference measurements, which the scheduler then uses to automatically determine optimal grouping and parameter assignment. This reduces the computational burden on the scheduler by leveraging UE-side measurements and decisions.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for MCS and/or rank selection for UE jointly served by BSs in a CoMP cluster. As described herein, MCS and/or rank selection may be based, at least in part, on the inter-cluster interference and intra-cluster interference experienced by the UE. According to aspects, a CoMP scheduler may assign a UE served by BSs in a CoMP cluster to one of a first group of UEs or a second group of UEs based, at least in part, on inter-cluster and intra-cluster interference experienced by the UE. The scheduler may assign at least one of a MCS or rank selection to the UE based, at least in part, on the assigned group. The scheduler may provide an indication, to one or more BSs in the CoMP cluster, of the at least one MCS or rank selection assigned to the UE.