Network Overlay Partitioning for CRAN Joint Processing

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Solution Overview

Problem

In large Cloud Radio Access Networks (CRAN) with joint processing, the complexity of joint scheduling and intercell interference increases significantly, making it challenging to maintain efficient throughput and coverage, especially as hyper-cell sizes grow, due to computational costs and interference issues.

Innovation Solution

The system partitions the network into multiple clusters and further divides them into overlays, each comprising virtual transmission points that can jointly transmit, ensuring no user equipment is a sub-cluster edge UE in all overlays, allowing for effective joint transmission and reducing overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If joint processing is implemented across large hyper-cells, then throughput and coverage are improved, but computational complexity and processing overhead increase dramatically

Engineering Contradiction:
ImprovethroughputVSAvoidcomputational complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent divides the large hyper-cell into multiple smaller cell clusters, where each cluster performs joint processing independently. This segmentation reduces the computational complexity at each processing node while maintaining the throughput benefits of joint processing through coordinated scheduling across clusters.

Inventive Principle:
Principle #1Segmentation

2Productivity

If joint processing is implemented across large hyper-cells, then coverage is improved, but joint processing overhead increases dramatically

Engineering Contradiction:
ImprovecoverageVSAvoidprocessing overhead
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The network is segmented into multiple cell clusters that can be independently managed. Each cluster handles its own joint processing overhead locally, reducing the overall processing overhead while maintaining coverage through coordinated operation across clusters.

Inventive Principle:
Principle #1Segmentation

3Productivity

If hyper-cell size increases, then joint transmission benefits are enhanced, but inter-TP synchronization becomes infeasible

Engineering Contradiction:
Improvejoint transmission performanceVSAvoidsynchronization feasibility
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

By dividing the large hyper-cell into smaller cell clusters, the patent reduces the physical distance and timing jitter between transmission points within each cluster. This makes inter-TP synchronization feasible and reliable while still providing joint transmission benefits through coordinated scheduling across multiple clusters.

Inventive Principle:
Principle #1Segmentation

4Quantity of substance

If hyper-cell size increases, then more UEs can be served, but computational costs for joint scheduling increase dramatically

Engineering Contradiction:
Improvenumber of UEs servedVSAvoidcomputational cost
Core Design Contradiction:
Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent segments the large number of UEs into different cell clusters, with each cluster performing joint scheduling for its subset of UEs. This reduces the computational cost at each processing node from O(N^2) to O((N/k)^2) where k is the number of clusters, while still serving all UEs through coordinated scheduling across clusters.

Inventive Principle:
Principle #1Segmentation

5Productivity

If joint processing is implemented across transmission points, then throughput is improved, but intercell interference increases

Engineering Contradiction:
ImprovethroughputVSAvoidintercell interference
Core Design Contradiction:
ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent segments the network into multiple cell clusters that can be scheduled independently. This spatial segmentation allows for reduced intercell interference through coordinated scheduling, where clusters can be activated in different time or frequency resources, while still achieving throughput improvement through joint processing within each cluster.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentEP2868015B1System and method for grouping and selecting transmission points
Publication Date: 2019.05.29 HUAWEI TECH CO LTD
  • EP2868015B1 patent drawingFigure 1a
  • EP2868015B1 patent drawingFigure 1b
  • EP2868015B1 patent drawingFigure 1c

AI summary

A method for operating a centralized controller in a communications network with a plurality of transmission points includes generating a plurality of overlays for the communications network in accordance with first mutual intercell interference levels for transmission point pairs in the communications network, wherein each overlay of the plurality of overlays comprises virtual transmission points (block 1210), and selecting a first overlay of the plurality of overlays in accordance with a merit measure derived from first user equipments (UEs) operating in the communications network tentatively scheduled to each overlay of the plurality of overlays (block 1215). The method also includes scheduling a first subset of the first UEs operating in the communications network during a first resource unit in accordance with the selected first overlay (block 1220).