Multi-Carrier Uplink Happy Bit and Power Headroom Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in increasing uplink data rates and capacity as the number of carriers increases, particularly in dual-cell high speed uplink packet access (HSUPA) systems, where control channels consume available capacity, limiting data transmission efficiency.
Innovation Solution
A method and apparatus for providing control information in multi-carrier uplink transmissions, where a WTRU sets a 'happy bit' for each uplink carrier based on its transmission capability, power headroom, and buffer status to indicate the need for additional resources, allowing for dynamic power control and scheduling adjustments across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers are introduced to increase uplink data rates, then data transmission capacity improves, but control channel capacity is consumed, limiting overall efficiency
Solution Approach 1:
The patent segments the control information transmission by introducing a new uplink carrier specifically dedicated to control channels, separating it from data transmission carriers. This allows control channels to operate independently without consuming data transmission capacity, resolving the contradiction between increasing data rates and maintaining control channel efficiency
Solution Approach 2:
The patent adds a new dimension to the carrier architecture by introducing a supplementary uplink carrier that operates in parallel with the anchor uplink carrier. This dimensional expansion allows the system to handle both control and data traffic simultaneously on different carriers, eliminating the resource contention that limits uplink data rates
2Productivity
If dual cell or multi carrier uplink E-DCH transmissions are introduced to increase data rates, then capacity grows linearly, but power allocation and resource management complexity increases
Solution Approach 1:
The patent introduces a new intermediary entity - the supplementary uplink carrier - that acts as a dedicated control plane between the WTRU and the network. This intermediary handles power headroom reporting and scheduling requests, simplifying the overall power control mechanism by providing a specialized channel for control information rather than mixing it with data transmissions
Solution Approach 2:
The patent enhances the feedback mechanism by enabling the WTRU to report power headroom information on the supplementary uplink carrier. This dedicated feedback channel allows the network to make more informed scheduling decisions, optimizing resource allocation across multiple carriers while managing power constraints effectively
Data Source
AI summary
A method and an apparatus for providing control information for multi-carrier uplink transmission are disclosed. A wireless transmit/receive unit (WTRU) may set a happy bit for enhanced dedicated channel (E-DCH) transmissions on each uplink carrier considering aggregated transmission capability over all uplink carriers. The happy bit is set to “unhappy” if the WTRU is transmitting as much scheduled data as allowed by a current serving grant, the WTRU has enough power available to transmit at a higher rate, and total E-DCH buffer status (TEBS) requires more than a pre-configured period to be transmitted with a current effective data rate aggregated over all uplink carriers. The WTRU may send scheduling information including power headroom measured on the anchor uplink carrier and/or power headroom measured on the supplementary uplink carrier. For power headroom measurements, the WTRU may initiate a short-lived dedicated physical control channel loop on the supplementary carrier.