Grant Splitting for Uplink Scheduling in Wireless Networks
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Solution Overview
Problem
In wireless communication networks, dynamic scheduling for uplink transmissions leads to significant signaling overhead, especially for services like VoIP. Additionally, handling multiple service types with different quality of service requirements and priorities complicates traffic multiplexing, particularly when high-priority traffic arrives late.
Innovation Solution
The solution involves splitting an earlier-starting grant into two overlapping and non-overlapping grants, allowing for proactive or reactive prioritization of higher-priority traffic. Additionally, the wireless device's physical layer can perform preemption on a repetition-by-repetition basis, enabling higher-priority traffic to puncture some repetitions of lower-priority traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for uplink transmissions, then transmission flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the uplink transmission opportunities into configured grants (semi-static) and dynamic grants (flexible). The configured grant provides a template for periodic transmissions, while dynamic grants only provide corrections or additions when needed. This segmentation reduces signaling overhead by avoiding redundant dynamic grants for every periodic transmission while maintaining flexibility when required.
Solution Approach 2:
The patent applies preliminary action by pre-configuring uplink transmission parameters (configured grant) before actual transmissions occur. The network node configures the wireless device with transmission templates, time offsets, and resource allocations in advance, so that the device can execute transmissions without receiving dynamic control signaling for each individual transmission occasion.
2Adaptability or versatility
If multiple service types with different priorities are multiplexed, then service versatility is improved, but traffic handling complexity increases
Solution Approach 1:
The patent introduces dynamic priority adjustment capabilities where the wireless device can reactively adjust transmission priorities based on arriving traffic. When high-priority traffic arrives after a grant is already allocated, the device can dynamically modify the grant execution to accommodate the high-priority traffic, either by preempting lower-priority transmissions or by adjusting timing to ensure high-priority traffic is transmitted first.
Solution Approach 2:
The patent applies preliminary anti-action by proactively splitting grants into overlapping and non-overlapping portions to prevent future conflicts. When the wireless device receives a grant that may conflict with later high-priority traffic, it pre-empts the potential conflict by creating separate grant portions, allowing high-priority traffic to be accommodated without disrupting the overall transmission schedule.
3Adaptability or versatility
If grant splitting is applied to accommodate high-priority traffic, then priority handling capability is improved, but grant processing complexity increases
Solution Approach 1:
The patent segments the grant processing into distinct non-overlapping and overlapping portions. The non-overlapping portion handles transmissions that do not conflict with other grants, while the overlapping portion handles transmissions that may conflict with later high-priority traffic. This segmentation allows the wireless device to process grants systematically without overwhelming complexity.
Solution Approach 2:
The patent applies local quality by treating different portions of the grant differently based on their temporal overlap characteristics. The non-overlapping portion is processed with standard timing, while the overlapping portion is processed with priority-aware timing that accommodates potential high-priority traffic. This localized differentiation simplifies overall processing by applying complex logic only where necessary.
Data Source
AI summary
A method performed by a wireless device comprises receiving (700) a first grant that allocates first radio resources for use by the wireless device and a second grant that allocates second radio resources for use by the wireless device, where the first radio resources partially overlap in time with the second radio resources. The method further comprises splitting (710) the first grant into a first non-overlapping grant and a first overlapping grant, where the first non-overlapping grant allocates a portion of the first radio resources which do not overlap in time with the second radio resources and the first overlapping grant allocates another portion of the first radio resources which overlap in time with the second radio resources.