Uplink MIMO Layer Adaptation for Backhaul Congestion
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Solution Overview
Problem
Base stations face congestion issues in their backhaul connections due to high rates of uplink data reception from UEs, leading to delayed transmission and network congestion, especially when using MIMO communication, which can be exacerbated by TDD carriers having fewer uplink resource blocks.
Innovation Solution
Transitioning from MIMO to SISO communication when the backhaul connection is congested, reducing the number of MIMO layers to alleviate congestion by reducing the data reception rate from UEs, thereby managing the data queue and preventing network overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO communication is used to increase data reception rate from UEs, then productivity is improved, but backhaul connection congestion worsens
Solution Approach 1:
The patent applies dynamics by making the MIMO layer configuration adjustable and adaptive rather than fixed. The base station dynamically transitions between MIMO modes (e.g., 4-layer, 2-layer, 1-layer MIMO or SISO) based on real-time backhaul congestion conditions, allowing the system to optimize data reception rate while preventing backhaul overload
Solution Approach 2:
The patent changes the parameter of MIMO layer count based on backhaul congestion status. When congestion is detected, the base station reduces the number of MIMO layers or switches to SISO, directly adjusting the communication parameter to control the data reception rate and alleviate backhaul congestion
2Productivity
If MIMO layers are increased to improve communication capacity, then productivity is improved, but network congestion worsens
Solution Approach 1:
The patent implements feedback by monitoring backhaul congestion conditions and using this information to adjust MIMO layer configuration. The base station continuously assesses backhaul status and provides feedback control by adapting the uplink MIMO layers accordingly, creating a closed-loop system that prevents network congestion while maintaining optimal communication capacity
3Productivity
If data reception rate is increased through MIMO, then productivity is improved, but loss of time worsens due to delayed transmission
Solution Approach 1:
The patent applies preliminary action by proactively reducing MIMO layers when backhaul congestion is detected, rather than waiting for severe congestion to occur. This preventive approach avoids the buildup of large data queues that would cause significant transmission delays, maintaining a balance between reception rate and timely transmission
Data Source
AI summary
When a base station is using multiple-input multiple-output (MIMO) communication defining multiple layers of communication to serve a user equipment device (UE) over an uplink channel, and the base station detects that its backhaul connection is threshold highly congested, the base station will responsively reduce the number of communication layers used to serve the UE over the uplink channel. In some examples, the base station could reduce the number of communication layers to a single layer, thereby transitioning from serving the UE using uplink MIMO communication to serving the UE using uplink single-input single-output (SISO) communication.