Signaling Reliability in High-Speed Shared Packet Data Channels
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Solution Overview
Problem
Current cellular wireless communication networks face challenges in ensuring reliable and timely transmission of delay-sensitive signaling messages over shared high-speed packet data channels, particularly due to the criticality and error-free requirements of these messages.
Innovation Solution
A priority scheme and data rate reduction method are implemented, where signaling messages are stored in buffers based on delay sensitivity and assigned priorities, and the data rate is adjusted using a weighting factor and offset factor based on channel conditions to ensure reliable transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If signaling messages are transmitted at the highest possible data rate based on channel conditions, then transmission speed is improved, but transmission reliability deteriorates due to channel condition changes during transmission and decoding
Solution Approach 1:
The patent applies parameter changes by adjusting the data rate from the highest possible rate to a reduced rate based on channel conditions. The system maps channel conditions to a highest possible data rate, then applies an offset factor to reduce the data rate to an adjusted data rate that ensures reliable transmission despite channel variations during transmission and decoding.
2Productivity
If a scheduling algorithm prioritizes packet data transmission on the shared channel, then data throughput is improved, but signaling message delivery timeliness deteriorates
Solution Approach 1:
The patent applies segmentation by separating signaling messages and packet data into different buffers (signaling buffer and packet data buffer). The scheduling algorithm independently manages these buffers, allowing signaling messages to be prioritized and transmitted without being blocked by packet data transmission, thus ensuring timely delivery while maintaining overall system throughput.
3Device complexity
If signaling messages are queued for transmission without priority differentiation, then system simplicity is maintained, but critical message delivery reliability deteriorates
Solution Approach 1:
The patent applies local quality by assigning different priorities to different signaling messages based on their criticality. The scheduling algorithm scales signaling message priorities by a weighting factor that reflects message criticality, ensuring that critical messages receive higher priority and are transmitted with greater reliability, while non-critical messages use standard priority levels.
Data Source
AI summary
The present invention provides a priority scheme and a data rate reduction method to increase the reliability of the signaling messages on a shared packet data channel. Signaling messages and packet data received for transmission are stored in a packet data buffer and at least one signaling buffer, respectively. Packet data or signaling messages are transmitted based on the scheduling algorithm assigned priority. The signaling message priorities are adjusted by a weighting factor assigned to the signaling buffer. The signaling message priority may be adjusted by a Quality of Service level. The transmission data rate is adjusted by an offset factor from the highest possible data rate that can be supported to a lower rate to improve reliability. To increase the effective data rate, the signaling message may be concatenated with another signaling message in order to completely fill the signaling message frame.