Cell-Based Transmission Priority in Wireless UEs
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Solution Overview
Problem
Wireless communication systems face challenges in managing conflicting scheduled transmissions, leading to increased latency and inefficiencies, particularly in prioritizing transmissions based on cell priority in multi-access systems like LTE and 5G networks.
Innovation Solution
The implementation of methods and systems that allow user equipment (UE) to determine and prioritize transmissions based on the priority of associated cells, enabling out-of-order HARQ-ACK feedback and scheduling adjustments to ensure high-priority transmissions are handled efficiently, even if they overlap with lower-priority ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmissions are scheduled based on control information reception time, then scheduling simplicity is maintained, but transmission latency increases for high-priority data
Solution Approach 1:
The patent changes the scheduling parameter from time-based (control information reception order) to priority-based (cell priority levels). The UE determines priorities associated with cells and transmits HARQ-ACK feedback based on these priorities rather than strictly following reception timing, allowing high-priority transmissions to be handled first while maintaining scheduling simplicity through priority indicators in control information
Solution Approach 2:
The patent introduces dynamic priority-based reordering of transmissions. The UE dynamically determines cell priorities and adjusts transmission order accordingly, allowing the system to adapt between in-order and out-of-order transmissions based on priority levels, thus reducing latency for high-priority data without requiring complete redesign of the scheduling mechanism
2Reliability
If out-of-order HARQ-ACK feedback is implemented, then transmission priority is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure priority indicators in control information before transmission. The UE receives and stores priority associations with cells in advance, allowing it to quickly determine transmission order without complex real-time calculations, thus improving priority handling while keeping processing complexity manageable
Solution Approach 2:
The patent uses feedback mechanisms where the network provides priority information through control information (DCI), and the UE provides HARQ-ACK feedback in priority-based order. This bidirectional feedback system allows the network to control priority assignments and the UE to report status efficiently, improving reliability without excessive complexity
3Productivity
If multiple cells are aggregated for communication, then system capacity increases, but managing conflicting transmissions becomes more difficult
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different cells or cell groups. Instead of treating all cells uniformly, the system allows specific cells to have high or low priority designations, enabling differentiated handling of transmissions from different cells. This allows capacity aggregation while managing conflicts through localized priority assignments rather than global complex arbitration
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first downlink control information (DCI) at a first time, and may receive a second DCI at a second, later time. Each DCI may contain scheduling information for scheduling a number of transmissions at the UE. A transmission associated with the first DCI on a first cell may be scheduled to start before or during a transmission associated with the second DCI on a second cell. The UE may then determine priorities associated with the first and second cells. In cases where the priority of the second cell is greater than the priority of the first cell, the UE may transmit the second scheduled transmission before it transmits the first scheduled transmission. As a result, the UE may prioritize transmitting the second scheduled transmission before the first scheduled transmission.