Uplink Grant Packet Grouping for XR Latency Reduction
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Solution Overview
Problem
Existing wireless communication systems lack an efficient method to handle high-throughput and low-latency applications, particularly in extended reality (XR) environments, where data packets are often transmitted in a first-in first-out manner without consideration for file-based transmission, leading to inefficiencies and increased latency.
Innovation Solution
Implementing a traffic-aware grant signaling method that allows base stations to transmit uplink grants indicating a packet-group transmission mode, enabling user equipment (UE) to group packets associated with a file, such as video frames, for simultaneous transmission, thereby reducing latency and improving throughput by ensuring packets from the same group arrive at the destination together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If packets are transmitted in first-in first-out manner, then transmission simplicity is maintained, but latency increases and throughput decreases for file-based applications
Solution Approach 1:
The system dynamically switches between FIFO transmission mode and packet-group transmission mode based on traffic type. For file-based traffic (e.g., video frames), the system activates packet-group mode where packets are grouped by file association and transmitted together, while maintaining FIFO mode for other traffic types, thus adapting transmission behavior to optimize throughput for specific applications without permanently increasing complexity
Solution Approach 2:
The base station changes the transmission parameter by setting a packet transmission mode indicator in the uplink grant. When this indicator specifies packet-group transmission mode, the UE groups packets by file association and transmits them together, transforming the transmission behavior from simple FIFO to file-aware grouped transmission, thereby improving throughput for file-based applications
2Loss of time
If packet-group transmission mode is implemented, then latency is reduced for file-based applications, but signaling overhead increases
Solution Approach 1:
The packet transmission mode indicator is applied locally and selectively only when file-based traffic is detected. The base station sets the indicator to specify packet-group transmission mode only for UEs or time slots carrying file-based traffic (e.g., video frames), while maintaining default FIFO mode for other traffic, thus reducing unnecessary signaling overhead while achieving latency reduction where needed
Solution Approach 2:
Instead of implementing full packet-group transmission for all traffic, the system applies partial action by using the packet transmission mode indicator only for specific file-based traffic types. This selective application reduces signaling overhead compared to universal implementation, while still achieving the latency benefit for critical file-based applications
3Productivity
If packets from the same file are transmitted together, then file processing efficiency is improved, but transmission scheduling complexity increases
Solution Approach 1:
The system segments packets by file association, grouping packets that belong to the same file (e.g., same video frame) together. The UE identifies file associations and organizes packets into groups, then transmits each group together when granted resources, improving file processing efficiency without requiring complex end-to-end scheduling, as the grouping is done at the UE level based on simple file association rules
4Measurement precision
If uplink grants include packet transmission mode indicators, then transmission accuracy is improved, but processing complexity at base station increases
Solution Approach 1:
The base station performs preliminary action by pre-configuring the UE with file association rules and transmission parameters before actual data transmission. The uplink grant includes a compact packet transmission mode indicator that the UE can process using pre-programmed logic, reducing the need for complex real-time processing at the base station while maintaining accurate transmission mode specification
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described According to one or more aspects of the present disclosure, a user equipment (UE) may receive an uplink grant of an uplink transmission from the UE to the base station. The UE may identify a packet transmission mode indicated in the uplink grant. The indication may specify whether the UE is to transmit the uplink transmission using a default mode, such as a first-in first-out mode, or a packet-group transmission mode. The UE may determine packets for inclusion in a transmission payload for the uplink transmission based on the identified transmission mode and transmit the uplink transmission in accordance with the packet transmission mode and the uplink grant.