Multi-Carrier CQI Reporting for Wireless Capacity
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Solution Overview
Problem
Wireless communication systems face limitations in transmission capacity, making it challenging to efficiently increase data transmission rates without significant capital investment in new system deployments.
Innovation Solution
Implementing techniques that utilize multiple carriers on both the forward and reverse links to enhance transmission capacity, including the use of multiple Forward Link (FL) and Reverse Link (RL) carriers, with modifications to existing channel structures to support multi-carrier operations, such as new R-ACKCH and R-CQICH structures, and operating modes like control-hold for reduced pilot overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers are deployed to improve transmission capacity, then data transmission rate increases, but system complexity and deployment cost increase
Solution Approach 1:
The system segments the available spectrum into multiple carriers, with one primary carrier and multiple secondary carriers. Each carrier can be independently activated or deactivated based on traffic demands, allowing the system to scale capacity incrementally without requiring all carriers to be deployed simultaneously, thus managing complexity while improving transmission capacity.
Solution Approach 2:
The patent implements dynamic carrier activation where secondary carriers are activated only when additional transmission capacity is needed. The system can dynamically switch between single-carrier and multi-carrier modes, adjusting the number of active carriers based on traffic conditions, which optimizes the balance between transmission capacity and system complexity.
2Loss of information
If full CQI reports are sent for all carriers, then channel quality information completeness improves, but reverse link overhead increases
Solution Approach 1:
The system applies different reporting strategies to different carriers based on their importance and channel conditions. Full CQI reports are sent for the primary carrier to ensure complete channel quality information, while differential CQI reports (containing only changes from previous reports) are sent for secondary carriers, reducing the amount of data transmitted while maintaining sufficient information quality.
Solution Approach 2:
Instead of sending complete CQI reports for all carriers every time, the system sends partial information (differential reports) for secondary carriers that contains only the essential changes. This partial action approach reduces reverse link overhead while still providing the base station with sufficient information to make scheduling decisions.
3Speed
If multiple carriers are activated to increase data rate, then peak data rate improves, but pilot overhead increases
Solution Approach 1:
The patent merges the pilot transmission resources across multiple carriers by using the same pilot sequence on the primary and secondary carriers. This allows the mobile station to estimate channel conditions for both carriers using a single pilot transmission, thereby achieving high peak data rates through multi-carrier operation without proportionally increasing pilot overhead.
Data Source
AI summary
Multiple full channel quality indication (CQI) reports indicative of received signal quality for multiple carriers in wireless communication are transmitted in multiple time intervals of a CQI channel.