Uplink Carrier Prioritization by Cell Type and Grant Timing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multiple uplink carriers due to limitations in the number of simultaneous transmissions a device can perform, leading to suboptimal utilization of available bandwidth.
Innovation Solution
A wireless transmit/receive unit (WTRU) prioritizes uplink carriers based on cell type and the timing of uplink grant DCI receptions to optimize transmission times, ensuring efficient use of available resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink carriers are configured to increase bandwidth, then bandwidth efficiency is improved, but the number of simultaneous transmissions exceeds device capability
Solution Approach 1:
The patent applies dynamics by making the set of active uplink carriers variable rather than fixed. The WTRU dynamically determines which carriers to transmit on based on real-time conditions, including received UL grant DCIs and transmission timing, allowing the system to adapt between using fewer carriers for simplicity and more carriers for bandwidth efficiency.
Solution Approach 2:
The patent applies preliminary action by having the WTRU receive and process UL grant DCIs before the actual transmission time. The configuration of which carriers to prioritize is determined in advance based on received DCIs, allowing the device to prepare its transmission strategy before the transmission opportunity arises.
2Productivity
If more carriers are transmitted simultaneously to improve throughput, then productivity increases, but the device transmission capability is exceeded
Solution Approach 1:
The patent applies feedback by using the received UL grant DCIs as input to determine transmission priorities. The WTRU receives feedback information (UL grant DCIs) about scheduled transmissions and uses this feedback to dynamically adjust which carriers should be transmitted, ensuring the device stays within its capability limits while maximizing throughput.
Solution Approach 2:
The patent applies parameter changes by modifying the set of active carriers based on timing parameters and DCI reception status. The WTRU changes which carriers are active for transmission based on when UL grant DCIs are received relative to transmission time, allowing the system to optimize throughput while respecting device capabilities.
3Reliability
If carrier prioritization is implemented to manage transmission limits, then device capability is respected, but bandwidth utilization may be reduced
Solution Approach 1:
The patent resolves this contradiction through dynamics by making the active carrier set adaptable. Rather than fixed prioritization that might underutilize bandwidth, the system dynamically selects carriers based on received UL grant DCIs, achieving both compliance with device capabilities and optimal bandwidth utilization when conditions permit.
Solution Approach 2:
The patent uses parameter changes by adjusting the carrier selection criteria based on timing parameters. The WTRU changes which carriers are prioritized based on when UL grant DCIs are received relative to transmission time, allowing the system to maximize bandwidth utilization while ensuring compliance with transmission capability limits.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein associated with prioritizing among uplink carriers and/or uplink transmissions. A maximum number of carrier(s) may be prioritized for transmission at a transmission time. The determination of which carrier(s) to prioritize may be based on a cell type the carrier(s) are associated with and/or may be based on when UL grant DCI(s) are received on the associated carrier(s) (e.g., relative to a transmission time to when other UL grant DCI(s) are received). The WTRU may transmit a respective physical uplink shared channel (RUSCH) transmission, via each prioritized carrier, using resource(s) associated with the respective CG of each prioritized carrier.