XR Uplink Scheduling With CBG Retransmission and Delay Budget
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Solution Overview
Problem
Existing 5G systems face challenges in efficiently supporting high data rate and low latency services like XR and cloud gaming due to limitations in scheduling mechanisms, which result in reduced system capacity and inflexible resource allocation, particularly for variable packet sizes and HARQ-ACK feedback latency.
Innovation Solution
Implementing enhanced scheduling techniques such as CBG-based transmission and Configured Grant (CG) scheduling to optimize retransmissions, along with flexible resource allocation and reduced HARQ-ACK feedback latency, to support XR services effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single DCI schedules multi-PDSCHs/multi-PUSCHs to reduce control overhead, then system capacity is improved, but HARQ-ACK feedback latency increases and flexibility for resource allocation is reduced
Solution Approach 1:
The patent segments the transport block into code block groups (CBGs) that can be independently scheduled and acknowledged. This allows selective retransmission of only failed CBGs rather than the entire TB, reducing feedback latency and improving system capacity simultaneously. The segmentation is achieved through dividing the TB into multiple CBGs with independent HARQ-ACK feedback mechanisms.
Solution Approach 2:
The patent implements dynamic scheduling where the network can flexibly allocate resources based on actual traffic conditions. The configured grant mechanism allows dynamic adjustment of uplink resources while maintaining low latency, enabling the system to adapt to varying packet sizes and traffic patterns without sacrificing capacity or increasing feedback latency.
2Loss of time
If configured grant scheduling is used to reduce latency for uplink AR traffic, then latency is improved, but flexibility to adjust resources for variable packet sizes is reduced
Solution Approach 1:
The patent enhances configured grant scheduling by enabling dynamic resource adjustment. The network can modify uplink channel occasions and resource allocation based on actual traffic conditions while maintaining the low-latency benefits of configured grants. This dynamic capability allows the system to adapt to variable packet sizes without sacrificing latency performance.
Solution Approach 2:
The patent allows changing scheduling parameters such as resource allocation, timing, and configuration based on traffic conditions. The network can adjust these parameters dynamically to match actual data transmission needs, providing flexibility for variable packet sizes while maintaining the low-latency advantage of configured grants.
3Productivity
If code-block group (CBG) transmission is implemented to improve spectral efficiency, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the transport block into code block groups that can be independently managed. This segmentation enables selective retransmission of only failed CBGs, improving spectral efficiency by avoiding redundant transmission of successful portions. The segmentation is implemented through standardized CBG configuration mechanisms that balance performance improvement with implementation complexity.
Data Source
AI summary
A transmission method implemented in a UE comprises generating an indication of a remaining delay budget for uplink (UL) data, transmitting, to a radio access network (RAN), the indication of the remaining delay budget, and transmitting the UL data to the RAN, via one or more UL resources allocated by the RAN.