OFDMA Control Channel Multiplexing for Wireless Reverse Link Overhead Reduction
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Solution Overview
Problem
Conventional wireless communication systems face limited capacity due to substantial overhead associated with multiple periodic CDMA control channels, particularly on the reverse link, which hampers efficient communication for multiple users.
Innovation Solution
The system employs dedicated OFDMA control channel resources for periodic logical control channels and CDMA control channels for non-periodic channels, allowing for selective use of physical control channels based on control information type, thereby optimizing resource allocation and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple periodic CDMA control channels are employed per user, then control information coverage is improved, but overhead becomes substantial and capacity is limited
Solution Approach 1:
The patent combines multiple periodic control channels into a single OFDMA control channel by multiplexing control information from multiple logical channels. This merging approach maintains comprehensive control information coverage while significantly reducing the overhead associated with having separate physical channels for each logical control channel.
Solution Approach 2:
The OFDMA control channel is designed to serve multiple functions simultaneously by carrying control information from multiple logical channels. This universal channel structure replaces the need for multiple dedicated CDMA control channels, reducing overall system overhead while maintaining full control functionality.
2Reliability
If multiple periodic CDMA control channels are employed per user, then control channel coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple control channel processing functions into a unified OFDMA control channel framework. This consolidation reduces device complexity by eliminating the need for separate processing chains for multiple periodic CDMA control channels, while still providing comprehensive control channel coverage through multiplexing.
3Productivity
If OFDMA control channels are used for periodic channels, then capacity is improved, but pilot overhead must be minimized
Solution Approach 1:
The patent extracts and separates pilot signals from the main control information transmission. By taking out pilot overhead as a distinct component and optimizing its allocation specifically for OFDMA control channels, the system achieves high communication capacity while minimizing the resource consumption dedicated to pilot signals.
Data Source
AI summary
Systems and methodologies are described that facilitate communicating reverse link control information over OFDMA control channel(s) and CDMA control channel(s). Dedicated OFDMA control channel resources can be assigned to mobile device(s). Control information related to one or more logical control channels can be generated by a mobile device. Further, a physical control channel type (e.g., OFDMA control channel or a CDMA control channel) can be selected for sending the control information via the reverse link. For example, control information associated with periodic, logical control channels can be multiplexed and sent over the OFDMA control channel (e.g., utilizing the dedicated OFDMA control channel resources) while control information related to non-periodic, logical control channels can be transmitted over the CDMA control channel.