Adaptive Downlink CoMP Transmission Mode Selection

Solution Overview

Problem

Prior downlink CoMP technologies fail to adapt dynamically to varying network environments, leading to suboptimal performance at cell edges and potential throughput degradation.

Innovation Solution

An adaptive method and apparatus for downlink CoMP transmission that determines the appropriate transmission mode (JT, CS, or CB) based on cell load values, channel correlation, and radio resource state, allowing for dynamic adaptation to network changes without degrading average throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If JT or CS technology is adopted to alleviate same-frequency interference at cell edge, then downlink performance of cell edge user is improved, but additional time-frequency resource in coordinating cell is occupied and average throughput of coordinating cell may be lowered

Engineering Contradiction:

Improvedownlink performance of cell edge userVSAvoidaverage throughput of coordinating cell

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic transmission mode selection based on real-time cell load assessment. The system transitions from static JT/CS adoption to dynamic adaptation, switching between JT, CS, and CB modes according to current network conditions. This resolves the contradiction by enabling the system to optimize between interference alleviation and throughput preservation based on actual load states.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of transmission mode selection based on cell load conditions. By introducing cell load as a decision parameter and establishing thresholds for load-based mode selection, the system dynamically adjusts transmission strategies. This allows the system to maintain high throughput during light load conditions while ensuring reliable cell edge performance during heavy load conditions.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If CB technology is adopted to transmit downlink data to different UEs over same time-frequency resource, then average throughput of cell is not significantly affected, but beam-forming vector of UE in coordinating cell needs to be adjusted thus degrading performance of UE to some extent

Engineering Contradiction:

Improveaverage throughput of cellVSAvoidperformance of UE

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic transmission mode selection based on real-time cell load assessment. The system transitions from static JT/CS adoption to dynamic adaptation, switching between JT, CS, and CB modes according to current network conditions. This resolves the contradiction by enabling the system to optimize between interference alleviation and throughput preservation based on actual load states.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of transmission mode selection based on cell load conditions. By introducing cell load as a decision parameter and establishing thresholds for load-based mode selection, the system dynamically adjusts transmission strategies. This allows the system to maintain high throughput during light load conditions while ensuring reliable cell edge performance during heavy load conditions.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If simply adopting one downlink CoMP transmission method (JT, CS, or CB) is used, then implementation is simple, but the system fails to adapt to varying network environment dynamically and cannot achieve good performance in time-varying radio channel environment and cell load environment

Engineering Contradiction:

Improveimplementation complexityVSAvoidadaptability to varying network environment

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic transmission mode selection based on real-time cell load assessment. The system transitions from static JT/CS adoption to dynamic adaptation, switching between JT, CS, and CB modes according to current network conditions. This resolves the contradiction by enabling the system to optimize between interference alleviation and throughput preservation based on actual load states.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent creates a universal transmission framework that supports multiple CoMP modes (JT, CS, CB) within a single system. By implementing a unified decision-making mechanism that can select from multiple transmission methods, the system achieves multi-functionality and broad adaptability across different network conditions without requiring separate implementations for each mode.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10382175B2Adaptive downlink coordinated multi-points transmission method and device

Publication Date: 2019.08.13 DATANG MOBILE COMM EQUIP CO LTD

AI summary

An adaptive downlink Coordinated Multi-Points (CoMP) transmission method and device are provided. The method includes: determining each coordinating cell corresponding to the serving cell of the downlink CoMP User Equipment (UE); counting the cell load value of each coordinating cell; on the basis of the cell load value of each coordinating cell, determining the transmission manner adopted by each coordinating cell for the downlink CoMP UE, and counting the number of coordinating cells corresponding to each transmission manner; and on the basis of the number of coordinating cells corresponding to each transmission manner, determining the transmission manner of the downlink CoMP UE.