Primary-Secondary Uplink Carrier Control for Peak Data Rates
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Solution Overview
Problem
There is a need to increase peak data rates and transmission efficiencies in uplink transmissions in wireless communication systems, particularly in systems utilizing multiple carriers, as existing technologies primarily focus on downlink improvements.
Innovation Solution
A method and apparatus for wireless transmission using multiple uplink carriers, where a WTRU transmits data and control channels on both a primary and a secondary uplink carrier, with specific control information associated with each carrier, enabling efficient power control and grant mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink carriers are used for transmission, then peak data rates and throughput are increased, but device complexity and control mechanism complexity increase
Solution Approach 1:
The patent segments the uplink transmission by introducing a primary uplink carrier and one or more secondary uplink carriers. The primary carrier handles control channels and data channels, while secondary carriers are dedicated primarily to data transmission. This segmentation allows the system to achieve higher peak data rates through multiple carriers while managing complexity by assigning specific functions to each carrier type.
Solution Approach 2:
The patent extends the uplink transmission from a single carrier dimension to multiple carrier dimensions. By introducing frequency division multiplexing across multiple carriers and implementing carrier-specific grant mechanisms, the system achieves higher throughput by utilizing additional frequency resources without proportionally increasing control complexity.
2Productivity
If control channels are transmitted on multiple uplink carriers, then transmission efficiency is improved, but power control complexity and interference management difficulty increase
Solution Approach 1:
The patent applies local quality by implementing carrier-specific grant mechanisms where each uplink carrier has its own grant parameters and power control settings. The network can signal absolute grants and relative grants specifically for the primary carrier, while secondary carriers use simplified grant mechanisms. This allows optimized power control and interference management for each carrier's specific function and traffic requirements.
Solution Approach 2:
The patent introduces an intermediary control structure where the primary uplink carrier serves as the main control interface, and secondary carriers are coordinated through references to the primary carrier's grant mechanisms. This intermediary approach allows efficient power control across multiple carriers by using the primary carrier as a reference point, reducing the overall control complexity while maintaining transmission efficiency.
Data Source
AI summary
A method and an apparatus for wireless transmission using multiple uplink carriers are disclosed. A wireless transmit/receive unit (WTRU) may transmit via a primary uplink carrier data, pilot and control channels for uplink transmissions on both uplink carriers, and transmit a data channel and a pilot channel via a secondary uplink carrier. Alternatively, the WTRU may transmit via a primary uplink carrier data, pilot, and control channels for uplink transmission on the primary uplink carrier, and transmit via a secondary uplink carrier data, pilot, and control channels for uplink transmissions on the secondary uplink carrier. Each uplink carrier may be associated with at least one specific downlink carrier such that the WTRU applies control information received on a downlink carrier to uplink transmissions on an uplink carrier associated with the downlink carrier on which the WTRU receives the control information.