Terminal Device Multi-Server Connection for Seamless PoC Switching
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Solution Overview
Problem
In push-to-talk over cellular (PoC) systems, switching server devices during a voice call due to deteriorating communication quality or delays can cause interruptions and require time to reconnect, potentially leading to voice loss.
Innovation Solution
A terminal device measures communication quality with multiple server devices, specifies an alternative server device based on this information, and establishes multi-session connections with both the current and alternative server devices to ensure seamless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the server device to be connected is switched during the voice call, then communication quality can be maintained, but it takes time to connect to a new server device and resume the call, and there is a possibility that the voice is interrupted
Solution Approach 1:
The terminal device performs measurement and evaluation of communication quality with multiple server devices before actually switching connections. The communication quality measurement unit continuously measures quality indicators (delay, packet loss, jitter) with candidate server devices in advance, so when a switch is needed, the terminal can immediately connect to a pre-evaluated alternative server device without interruption.
Solution Approach 2:
The invention introduces a communication quality measurement unit as an intermediary that continuously monitors and evaluates multiple server devices. This intermediary provides real-time quality information that enables smooth transition between server devices by identifying suitable alternatives before actual connection switching occurs, thus avoiding voice interruption.
2Reliability
If the server device to be connected is switched during the voice call, then communication quality can be maintained, but voice interruption may occur due to loss of a voice packet, retransmission, or the like
Solution Approach 1:
The terminal device performs measurement and evaluation of communication quality with multiple server devices before actually switching connections. The communication quality measurement unit continuously measures quality indicators (delay, packet loss, jitter) with candidate server devices in advance, so when a switch is needed, the terminal can immediately connect to a pre-evaluated alternative server device without interruption.
Solution Approach 2:
The invention maintains connection information for multiple server devices as backup options. When the current server device shows deterioration, the terminal device can switch to a pre-identified alternative server device with acceptable communication quality, cushioning against voice packet loss and interruption that would occur with direct switching to an untested server.
3Reliability
If multiple connections are maintained with current and alternative server devices, then seamless communication is ensured, but device complexity increases
Solution Approach 1:
The terminal device performs measurement and evaluation of communication quality with multiple server devices before actually switching connections. The communication quality measurement unit continuously measures quality indicators (delay, packet loss, jitter) with candidate server devices in advance, so when a switch is needed, the terminal can immediately connect to a pre-evaluated alternative server device without interruption.
Solution Approach 2:
The invention changes the evaluation parameters dynamically based on communication conditions. The communication quality measurement unit measures multiple parameters (delay, packet loss, jitter) and uses these changing parameters to determine when and which server device to switch to, managing complexity through adaptive parameter-based decision making rather than fixed connection rules.
Data Source
AI summary
A terminal device includes a communication unit that communicates with a terminal device of a communication partner, a communication quality information generation unit that measures communication quality with a plurality of server devices and generates communication quality information indicating the communication quality, a connection destination specification unit that specifies a second server device different from a first server device that is a current connection target, a connection management unit that controls a communication unit to establish connection to the first server device, a request information transmission unit that controls, in a case of performing communication from a local terminal device to an other terminal device, the communication unit to transmit, to the other terminal device, multi-session request information including connection information to the second server device, and a response information reception unit that controls the communication unit to acquire multi-session response information including connection information between the other terminal device and a third server device from the other terminal device. The connection management unit controls the communication unit to connect the local terminal device with the second server device and the third server device in a case where multi-session response information is acquired.