TDD Air Interface Voice Call Mode Control
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Solution Overview
Problem
TDD air interface configurations in wireless communication systems limit air interface capacity, leading to delayed or blocked communications, especially during high traffic demand, which can impact latency-sensitive services like voice calls.
Innovation Solution
A method where a base station dynamically controls user equipment (UE) to switch between VoLTE and SRLTE modes based on traffic demand thresholds set according to the TDD frame configuration, allowing UEs to offload voice calls to a secondary base station when traffic exceeds a predetermined level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD frame configuration is used to multiplex downlink and uplink communication, then air interface resource utilization is improved, but air interface capacity is limited causing delayed or blocked communications during high traffic demand
Solution Approach 1:
The system dynamically adjusts the voice call communication mode based on real-time air interface load conditions. When load exceeds a threshold, the base station signals the UE to switch from VoLTE mode to SRLTE mode, enabling adaptive response to changing traffic conditions and preventing communication delays or blockages
Solution Approach 2:
The invention changes the communication mode parameter (from VoLTE to SRLTE) based on air interface load threshold evaluation. This parameter change allows the system to maintain reliable voice call quality by switching to an alternative communication path when the primary TDD air interface becomes congested
2Quantity of substance
If TDD carrier multiplexes downlink and uplink in time intervals, then frequency spectrum efficiency is improved, but uplink capacity is reduced when fewer uplink subframes are allocated
Solution Approach 1:
The invention extracts voice call traffic from the TDD air interface when uplink capacity becomes insufficient. By switching to SRLTE mode, the voice call communication is separated from the constrained TDD uplink resources, allowing the TDD system to maintain frequency spectrum efficiency while voice calls use alternative resources
3Area of stationary object
If base station serves multiple UEs on TDD air interface, then network coverage is improved, but air interface capacity constraints cause traffic delays during high demand
Solution Approach 1:
The base station acts as an intermediary that monitors air interface load and mediates the communication mode selection. When traffic demand exceeds capacity, the base station intermediates by signaling the UE to switch to SRLTE mode, preventing communication delays while maintaining network coverage for multiple UEs
Data Source
AI summary
In a wireless system in which a base station provides a time division duplex (TDD) air interface having a TDD frame configuration, a method and system for controlling whether a user equipment device (UE) operates in a first mode in which the UE sets up and engages in voice call communication via the base station or rather operates in a second mode in which the UE tunes away from the base station to set up and engage in voice call communication via another base station, such as under a different air interface protocol. The method involves determining whether traffic demand for the air interface exceeds a threshold level, and if so, causing the UE to operate in the second mode rather than in the first mode. Further, the method involves setting the threshold level based on the TDD frame configuration of the air interface.