Uplink Transmission Timeline Reduction via Preliminary Buffering
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Solution Overview
Problem
In wireless communication systems, especially in unlicensed and shared spectrum environments, there is a challenge in reducing transmission timelines for uplink communications due to insufficient time for user equipment (UE) to decode downlink signals and prepare uplink transmissions before the end of a channel occupancy time (COT), leading to inefficiencies and potential collisions.
Innovation Solution
The implementation of mechanisms that allow for pre-preparation of uplink packets and the use of reference scheduling delays to reduce timelines, enabling earlier uplink transmissions and leveraging knowledge of UE transmission capabilities for more efficient scheduling by base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE waits to receive scheduling grants in downlink communications before transmitting uplink signals, then transmission timing can be coordinated, but the N1 and N2 timelines become too long causing missed transmission opportunities at the end of channel occupancy time
Solution Approach 1:
The UE performs preliminary actions by generating and buffering uplink communication signals during the first time period based on scheduled grants or configured grants received in advance. This allows the UE to have signals ready for transmission without waiting for additional downlink scheduling grants, thereby reducing the N1 and N2 timelines while ensuring reliable transmission during the available channel occupancy time.
2Productivity
If the UE generates uplink signals based on scheduled grants received in advance, then transmission preparation time is reduced, but the UE may miss transmission opportunities if channel conditions change or new scheduling grants are not received
Solution Approach 1:
The system dynamically adapts by allowing the UE to monitor for new downlink scheduling grants during the second time period. If new grants are received, the UE can adjust its transmission timing accordingly. This dynamic approach maintains high productivity through pre-generated signals while preserving adaptability to changing channel conditions and network scheduling decisions.
Data Source
AI summary
Wireless communications systems and methods related to communications in a network are provided. A user equipment (UE) may generate during a first time period, an uplink (UL) communication signal based on a scheduled grant or a configured UL grant. The UE may detect a downlink (DL) communication from a base station (BS) during a second time period after the first time period. The DL communication is devoid of the scheduled grant and the configured UL grant. The UE may transmit to the BS, the UL communication signal based on the scheduled grant or the configured UL grant in response to detecting the DL communication.