HARQ Protocol Layer Segmentation for VoLTE Signal Integrity
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Solution Overview
Problem
Current LTE networks face challenges in maintaining high-quality Voice Over LTE (VoLTE) calls due to the absence of Hybrid Automatic Repeat Request (HARQ) algorithms at each layer of the protocol stack, leading to higher retransmission rates and poor audio services, especially in areas with poor RF signals.
Innovation Solution
Implementing a HARQ algorithm at each layer of the protocol stack in LTE networks, dynamically managed by the eNodeB, to identify and address poor RF signal conditions and high retransmission rates, thereby optimizing voice services by ensuring data integrity and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ algorithm is implemented at each layer of protocol stack, then voice service quality is improved and retransmission rate is reduced, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies segmentation by implementing HARQ algorithms at each individual layer of the protocol stack (physical layer, MAC layer, RLC layer, PDCP layer) rather than as a monolithic system. This allows each layer to independently handle error correction for its specific data transmissions, improving voice service quality while distributing the computational complexity across multiple manageable components rather than concentrating it in one complex system.
2Reliability
If HARQ algorithm is implemented at each layer, then data integrity is improved, but processing time and latency increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring HARQ processes at each protocol layer before actual voice data transmission begins. Each layer maintains pre-established error correction mechanisms and buffer structures, allowing immediate error detection and correction without requiring additional processing setup time during active voice calls, thus maintaining data integrity while minimizing latency.
3Reliability
If HARQ is dynamically managed based on RF signal conditions, then voice service in poor signal areas is improved, but system complexity and control overhead increase
Solution Approach 1:
The patent applies dynamics by enabling the eNodeB to dynamically activate or deactivate HARQ processes at different protocol layers based on real-time RF signal quality measurements. When poor signal conditions are detected, HARQ is activated across multiple layers to maximize error correction capability. When signal conditions improve, HARQ processes are selectively deactivated to reduce processing overhead, thus adapting system complexity to actual service needs.
Solution Approach 2:
The patent implements local quality by allowing different protocol layers to have different HARQ configurations based on local signal conditions and layer-specific requirements. Rather than uniformly applying HARQ across all layers, the system selectively enables HARQ at specific layers (physical, MAC, RLC, or PDCP) depending on where it provides the most benefit for the current voice transmission, optimizing resource usage while improving service quality in poor RF areas.
Data Source
AI summary
Systems, methods, and computer-readable media for optimizing voice services are provided. Hybrid automatic repeat request (HARQ) is an algorithm that implements fast retransmissions of lost blocks or packets of data. HARQ is an error correcting algorithm. Data may be lost at any layer of a protocol stack, thus, increasing a retransmission rate. In order to reduce the retransmission rate and increase quality of voice services, HARQ may be implemented at each layer of a protocol stack based on, for example, radio frequency signal and retransmission rates.