QoS Buffering for TTI Bundling Voice Data Trade-off
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing good connection quality for packet-switched voice communications, especially in poor RF conditions, when both voice and data services are transmitted over shared packet-switched communication links, which can reduce throughput and impact voice communication reliability.
Innovation Solution
Implementing Quality of Service (QoS) based buffering at the application layer while Transmission Time Interval (TTI) bundling is enabled, allowing selective buffering of uplink data based on priority levels to optimize voice and data transmission, distinguishing between voice and data packets and managing TTI bundling to prioritize voice communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is enabled to improve voice transmission reliability in poor RF conditions, then voice communication quality is improved, but data transmission throughput is reduced
Solution Approach 1:
The patent segments data packets into different QoS categories (voice and data) and applies different transmission strategies to each. Voice packets are transmitted using TTI bundling for reliability, while data packets are buffered and transmitted when TTI bundling is not active, thus resolving the contradiction between voice reliability and data throughput
Solution Approach 2:
The patent implements preliminary buffering of data packets at the application layer before transmission. This allows the system to prepare data packets in advance and transmit them during periods when TTI bundling is not enabled, thereby maintaining data throughput while preserving voice transmission reliability
2Reliability
If TTI bundling is enabled to ensure voice packet delivery, then connection quality is improved, but network resource usage efficiency deteriorates
Solution Approach 1:
The patent applies different transmission qualities to different packet types. Voice packets receive the high-reliability TTI bundling treatment locally, while data packets are handled with standard transmission protocols, thus improving connection quality for voice without unnecessarily consuming network resources for data transmission
3Device complexity
If the MAC layer implements TTI bundling without QoS differentiation, then implementation complexity is reduced, but ability to distinguish voice and data packets is lost
Solution Approach 1:
The patent adds a new dimension of QoS-based buffering at the application layer above the MAC layer. This dimensional addition allows the system to maintain the simple MAC layer implementation while introducing packet differentiation capability through the application layer's QoS mechanisms
Data Source
AI summary
QoS based uplink data buffering while TTI bundling is enabled by a wireless user equipment (UE) device. The UE may establish a packet-switched connection with a network via a wireless link. The UE may receive, at a media access control (MAC) layer, an indication to enable TTI bundling. The UE may selectively buffer uplink data at an application layer based on the indication to enable TTI bundling. The uplink data may be buffered selectively based on Quality of Service (QoS) considerations. Uplink transmissions may subsequently be performed using TTI bundling.