Distributed Access Point Selection for D-MIMO Networks

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Solution Overview

Problem

Existing D-MIMO systems face challenges in efficiently managing a large number of distributed access points, requiring high computational resources and high fronthaul data traffic, which complicates coherent operation and increases energy consumption.

Innovation Solution

A method for selecting access points in a D-MIMO network that involves categorizing access points into serving and observing sets based on channel information, allowing for flexible adaptation of cooperation among a subset of nodes to optimize performance under varying channel conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all access points are activated for coherent operation in D-MIMO systems, then system performance is improved, but computational complexity and fronthaul load increase significantly

Engineering Contradiction:
Improvesystem performanceVSAvoidcomputational complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the set of all access points into two distinct groups: serving access points that actively participate in coherent transmission/reception, and non-serving access points that remain inactive for data processing. This segmentation allows the system to achieve good performance with a limited subset of APs, thereby reducing computational complexity and fronthaul requirements while maintaining reliability through coordinated multi-point operation among the serving subset.

Inventive Principle:
Principle #1Segmentation

2Reliability

If all access points cooperate coherently, then data transmission reliability is improved, but energy consumption increases

Engineering Contradiction:
Improvedata transmission reliabilityVSAvoidenergy consumption
Core Design Contradiction:
ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent divides access points into serving and non-serving subsets, where only serving APs are activated for coherent data transmission and reception. This selective activation reduces the number of APs that consume energy for processing, while maintaining transmission reliability through coordinated operation among the serving subset. The non-serving APs can remain in low-power states, thereby reducing overall network energy consumption.

Inventive Principle:
Principle #1Segmentation

3Productivity

If a large number of access points are interconnected, then network coverage and capacity are improved, but fronthaul data traffic load increases

Engineering Contradiction:
Improvenetwork capacityVSAvoidfronthaul data traffic
Core Design Contradiction:
ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the AP network into serving and non-serving groups, where only serving APs exchange data over the fronthaul with the network core. This reduces fronthaul traffic load compared to having all APs interconnected and actively participating in coherent operations. The network capacity is maintained through the coordinated operation of the serving subset, while the quantity of data traversing the fronthaul is reduced by excluding non-serving APs from active participation.

Inventive Principle:
Principle #1Segmentation

4Reliability

If all access points are actively decoding and transmitting, then coherent operation performance is improved, but system configuration complexity increases

Engineering Contradiction:
Improvecoherent operation performanceVSAvoidsystem configuration complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent simplifies system configuration by segmenting APs into serving and non-serving roles with clearly defined functions. Serving APs are configured for coherent transmission and reception, while non-serving APs have simplified configurations. This role-based segmentation reduces configuration complexity compared to uniformly configuring all APs for full coherent operation, while maintaining reliable coherent performance among the serving subset through standardized coordination procedures.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS20250159601A1Selecting access points for serving a user equipment
Publication Date: 2025.05.15 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
  • US20250159601A1 patent drawing
  • US20250159601A1 patent drawing
  • US20250159601A1 patent drawing

AI summary

A method of selecting access points for serving a User Equipment (UE). The method includes receiving, for each access point in a first set of one or more access points, information identifying channel information between the access point and the UE, wherein the first set of access points includes access points currently serving the UE, receiving, for each access point in a second set of one or more access points, information identifying channel information between the access point and the UE, wherein the second set of access points have points not currently serving the UE, and selecting one or more access points from the first set of one or more access points and/or one or more access points from the second set of one or more access points to serve the UE based on the information identifying the channel information between the UE and the access points.