Coherent Joint Transmission Control for Cell-Edge User Throughput
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Solution Overview
Problem
Existing Coherent Joint Transmission (CJT) technologies face challenges in efficiently managing user association, handover, and power control for inter-site CJT, leading to high computational complexity and fronthaul bandwidth requirements, especially in 5G-Advanced and 6G networks, which affect cell edge performance and system capacity.
Innovation Solution
A system and method for local clustering of TRPs and user association based on RSRP, SINR, and predicted throughput, enabling selective joint processing for cell-edge users, with handover and power control procedures to optimize system capacity while reducing complexity and fronthaul traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint processing is applied to all users to improve system performance, then cell edge SINR and user throughput are improved, but computational complexity and fronthaul bandwidth requirements increase significantly
Solution Approach 1:
The patent applies joint processing selectively only to cell-edge users rather than all users. The base station identifies users based on their channel conditions and applies CJT only to those experiencing poor signal quality at cell edges, while using conventional processing for cell-center users. This localized application maintains throughput improvements for vulnerable users while avoiding the computational overhead of system-wide joint processing.
2Reliability
If joint processing is applied to all users to improve cell edge performance, then SINR at cell edge is improved, but fronthaul bandwidth requirements increase
Solution Approach 1:
The system applies joint processing only to cell-edge users who require improved SINR, rather than applying it universally. By identifying users based on their specific channel conditions and location, the system concentrates fronthaul resources only where needed for joint decoding, reducing overall fronthaul bandwidth requirements while maintaining reliable service at cell edges.
3Productivity
If joint processing is applied universally to improve system capacity, then overall system capacity increases, but implementation complexity in RAN increases
Solution Approach 1:
The patent implements a user-specific joint processing approach where the base station evaluates each user's channel conditions, location, and signal quality metrics to determine eligibility for joint processing. This selective application based on local user characteristics maintains system capacity improvements while avoiding the uniform complexity burden of implementing joint processing for all users across the RAN.
Data Source
AI summary
According to various examples, a radio access network controller is described comprising a processor configured to determine whether a mobile terminal is located at a center region of a radio cell of a communication network or an edge region of the radio cell, and control the communication network to serve the mobile terminal by a plurality of radio units of a plurality of radio cells using coherent joint transmission by allocating the same time, frequency, code and spatial resources, if the processor determines that the mobile terminal is in the edge region of the radio cell and control the communication network to serve the mobile terminal by one radio unit of the radio cell using single-cell processing if the processor determines that the mobile terminal is in the center region of the radio cell.