VoLTE Emergency Call Quality Adjustment via HARQ Settings
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Solution Overview
Problem
Wireless communication devices experience errors during VoLTE sessions due to environmental obstructions and signal strength issues, particularly in critical communications like emergency calls, where reliable data transmission is essential.
Innovation Solution
A method and system for a wireless access node to adjust communication quality by exchanging VoLTE packets with a public safety answering point (PSAP) during emergency calls, receiving a scheduling request with HARQ settings, and issuing a scheduling grant based on these settings to improve data delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error control techniques such as HARQ are utilized during VoLTE emergency calls, then data transmission reliability is improved, but communication latency and complexity increase
Solution Approach 1:
The patent dynamically adjusts HARQ parameters (such as HARQ process ID, redundancy version, and timing advance) based on real-time channel conditions and call priority. This allows the system to optimize reliability by changing parameters adaptively rather than using fixed complex protocols, resolving the contradiction between reliability improvement and complexity reduction.
2Reliability
If HARQ settings are optimized for emergency calls, then communication quality is improved, but scheduling overhead increases
Solution Approach 1:
The patent pre-configures HARQ parameters and scheduling grants for emergency calls before actual transmission begins. By preparing the communication parameters in advance and establishing dedicated resources, the system achieves high communication quality without incurring scheduling overhead during the critical emergency call period.
3Reliability
If scheduling requests are received from PSAP with specific HARQ settings, then emergency call performance is improved, but network resource allocation complexity increases
Solution Approach 1:
The patent introduces a dedicated emergency call handling mechanism that acts as an intermediary between PSAP scheduling requests and network resource allocation. This intermediary layer translates PSAP requirements into standardized resource allocation commands, improving emergency call performance while shielding the core network from complexity increases.
Data Source
AI summary
A wireless access node to facilitate communication quality adjustments during voice over long term evolution (VoLTE) communication sessions comprises a wireless communication transceiver and a processing system. The wireless communication transceiver is configured to exchange VoLTE packets with a wireless communication device during a VoLTE emergency call with a public safety answering point (PSAP), and receive a scheduling request transmitted from the PSAP, wherein the scheduling request includes an identifier associated with the wireless communication device and specifies hybrid automatic repeat request (HARQ) settings for the VoLTE emergency call. The processing system is configured to, responsive to the scheduling request, issue a scheduling grant to the wireless communication device based on the HARQ settings specified in the scheduling request.