Group Scheduling for VoIP Control Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing voice over IP (VoIP) traffic due to increased overhead in control and feedback mechanisms, particularly in systems like HSDPA and 802.16e, where the large number of voice packets overwhelm existing resource allocation and channel quality feedback systems, affecting speech quality and capacity.
Innovation Solution
The method involves grouping wireless communication terminals based on radio channel conditions and terminal characteristics to efficiently allocate radio resources using shared channels, assigning control channels to groups, and optimizing resource assignment control channel information to minimize overhead and enhance capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of VoIP users is increased by using smaller packet sizes, then system capacity is improved, but control and feedback overhead increases significantly
Solution Approach 1:
The patent merges multiple control functions into a single shared control channel. Instead of having separate dedicated control channels for each user, the invention combines resource allocation, channel quality feedback, and acknowledgment mechanisms into a unified shared control channel that serves multiple VoIP users simultaneously, thereby reducing overall control overhead while maintaining system capacity
Solution Approach 2:
The shared control channel is designed to perform multiple functions: resource allocation for multiple users, channel quality feedback collection, and acknowledgment signaling. This multi-functional approach eliminates the need for separate dedicated control channels for each user, reducing control overhead while supporting increased system capacity
2Measurement precision
If dedicated control signaling is used for each user, then resource allocation accuracy is improved, but control channel overhead increases
Solution Approach 1:
The patent segments the control channel into logical groups rather than dedicating separate physical channels to each user. Users are organized into groups that share common control resources, allowing the system to maintain precise resource allocation through group-based signaling while reducing the total number of control channels required
Solution Approach 2:
Instead of creating unique dedicated control channels for each user, the invention uses copied or reused control channel structures for groups of users. The same control channel format and signaling mechanisms are replicated and shared across multiple user groups, reducing overall system complexity while maintaining allocation accuracy
3Device complexity
If voice packets are grouped together for transmission, then control overhead is reduced, but speech quality deteriorates due to longer loss periods
Solution Approach 1:
The patent implements dynamic packet grouping where the grouping strategy adapts based on channel conditions and traffic patterns. Rather than fixed large packets, the system can dynamically adjust packet sizes and grouping configurations to balance control overhead reduction with speech quality maintenance, allowing smaller packets to be used when quality is prioritized
Solution Approach 2:
The invention incorporates feedback mechanisms that monitor speech quality and channel conditions in real-time. This feedback enables the system to adjust packet grouping strategies dynamically, reducing control overhead through grouping while maintaining speech quality by switching to smaller packets or different grouping configurations when quality degradation is detected
Data Source
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AI summary
A wireless communication network (100) wherein information is communicated in frames comprising multiple sub-frames, including grouping a terminal in first and second groups, assigning the first and second groups to less than all sub-frames in a frame, assigning a control channel of at least one assigned sub-frame to the first and second groups.