Supplementary Uplink Carrier Allocation for Reliable Wireless Coverage
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing multiple uplink carriers, particularly in configuring mobile devices to efficiently utilize both a regular and supplementary uplink carrier for enhanced transmission performance, including coverage and reliability.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to receive uplink grants for both a regular and supplementary uplink carrier, associated with a common downlink carrier, and selectively transmits data on these carriers based on frequency, quality, timing, and other factors to optimize transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile device is configured with multiple UL carriers (including both RUL and SUL carriers), then transmission reliability and coverage are improved, but device complexity and processing burden increase
Solution Approach 1:
The patent segments the uplink transmission by dividing logical channels into different groups (first set and second set) that are assigned to different UL carriers (RUL and SUL). This segmentation allows the device to manage multiple carriers more efficiently by processing different channel types separately, reducing the overall processing burden while maintaining transmission reliability through diversified carrier usage.
Solution Approach 2:
The patent implements dynamic carrier selection where the mobile device can adaptively choose between RUL and SUL carriers based on real-time conditions such as coverage requirements, data priority, and channel quality. This dynamic approach allows the device to optimize transmission reliability without continuously managing all possible carrier configurations, thereby reducing device complexity through context-aware carrier management.
2Productivity
If a mobile device transmits data on both RUL and SUL carriers simultaneously, then transmission performance and coverage are enhanced, but processing burden and complexity increase
Solution Approach 1:
The patent segments uplink data transmission by assigning different logical channel groups to different UL carriers. The first set of logical channels is transmitted on the RUL carrier while the second set is transmitted on the SUL carrier. This segmentation enables parallel transmission processing without requiring the device to manage all channels on a single carrier, thereby enhancing transmission performance while distributing the processing burden across multiple specialized channels.
3Productivity
If the RUL carrier operates at higher frequency, then data transmission capacity is improved, but coverage area is reduced
Solution Approach 1:
The patent employs asymmetric carrier configuration where the RUL carrier operates at a higher frequency to provide high-capacity data transmission, while the SUL carrier operates at a lower frequency to provide extended coverage. This asymmetric setup allows the system to leverage the strengths of each frequency range for different transmission needs, achieving both high data capacity where needed and broad coverage where required without requiring a single carrier to compromise either attribute.
Data Source
AI summary
Systems, methods, and instrumentalities are disclosed for uplink (UL) transmissions in wireless systems. The systems, methods and instrumentalities may include a wireless transmit/receive unit (WTRU) with a receiver configured to receive one or more uplink (UL) grants that may include allocations associated with a regular UL (RUL) carrier and a supplementary UL (SUL) carrier. The RUL and SUL carriers may be associated with a common downlink (DL) carrier of a serving cell. The WTRU may include a processor configured to select data from one or more logical channels for transmission in accordance with the allocations. The WTRU may include a transmitter configured to transmit data from one logical channel on the RUL carrier and to transmit data from another logical channel on the SUL carrier in accordance with the allocations.