Synchronous Data Voice Transmission in 1.5 Uplink Trunk Groups
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Solution Overview
Problem
In GSM-based wireless communication systems, application data cannot be transmitted synchronously with voice in the 1.5 uplink access mode, limiting the provision of services requiring simultaneous data and voice transmission.
Innovation Solution
A method and system that allow synchronous transmission of application data and voice by using a dedicated channel uplink for the talker and a group call channel uplink for the listener, with the network side recognizing and broadcasting the application data via extended Access Burst messages, ensuring independent uplink access for data and voice transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 1.5 uplink access mode is used with dedicated channel for talker, then voice transmission quality is improved, but application data cannot be transmitted synchronously with voice
Solution Approach 1:
The patent segments the uplink transmission resources by separating voice transmission (using dedicated channel) from data transmission (using group call channel). The talker uses the dedicated channel for voice while a listener uses the group call channel uplink for data transmission, allowing both functions to operate simultaneously without mutual interference.
Solution Approach 2:
The group call channel uplink is utilized for dual purposes: it serves as the control channel for group call management and simultaneously as a data transmission channel for application data. This multi-functionality enables data to be transmitted during ongoing voice calls without requiring additional dedicated resources.
2Adaptability or versatility
If group call channel uplink is occupied by listener for data transmission, then data transmission is enabled, but voice transmission may be affected
Solution Approach 1:
The patent applies local quality by allowing data transmission only in specific conditions and locations within the communication system. The listener transmits data via group call channel uplink only when the talker is using the dedicated channel for voice, and the network identifies and prioritizes voice traffic to ensure its quality is not degraded by data transmissions.
Solution Approach 2:
The network side acts as an intermediary that receives both voice packets from the dedicated channel and data packets from the group call channel, then manages their transmission and broadcasting. This intermediary role ensures proper resource allocation and prevents data transmissions from interfering with voice quality.
3Adaptability or versatility
If synchronous data and voice transmission is implemented, then service capability is improved, but system complexity increases
Solution Approach 1:
The patent merges data transmission with the existing group call control channel infrastructure. By utilizing the group call channel uplink for both its original control functions and for application data transmission, the system enables synchronous data and voice services without adding separate dedicated data channels, thus avoiding significant increases in system complexity.
Data Source
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AI summary
A method and a system for transmitting application data in a trunk group are provided by the present invention. The method includes sending, by a talker or a listener, application data to network side of a wireless communication system, wherein the application data from the talker is transmitted via a dedicated channel uplink occupied by the talker, and the application data from the listener is transmitted via a group call channel uplink of a trunk group; receiving, by the network side of the wireless communication system, the application data sent from the talker or the listener, and broadcasting the application data in the trunk group. According to the method and system provided by the embodiments of the present invention, application data transmission can be implemented in the trunk group in which 1.5 uplink access mode is adopted and PTT takeover is allowed, and therefore synchronous transmission of data and voice can be realized.