Dynamic Uplink Traffic Prioritization in NR Medium Access Control
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Solution Overview
Problem
Current wireless communication systems face challenges in dynamically prioritizing uplink traffic in New Radio (NR) medium access control, particularly in scenarios requiring low-latency and periodic transmissions, where dynamic scheduling incurs delays and overhead, and existing solutions like semi-persistent scheduling do not fully address the need for flexible uplink transmission management.
Innovation Solution
The implementation of dynamic prioritization of uplink traffic in NR medium access control, allowing scheduled entities to skip or delay uplink transmission grants based on priority levels, power saving modes, and channel conditions, while maintaining an RRC connection and using connected mode discontinuous reception (C-DRX) to optimize resource allocation and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for uplink transmissions, then transmission flexibility is improved, but scheduling delay and overhead increase
Solution Approach 1:
The patent implements dynamic prioritization where the scheduling entity can dynamically adjust the priority of uplink traffic based on current network conditions, QoS requirements, and buffer status. This allows the system to adapt transmission priorities in real-time without requiring full dynamic scheduling procedures, resolving the contradiction between flexibility and delay.
Solution Approach 2:
The patent establishes priority rules and configurations in advance for different uplink traffic types. When uplink data arrives, the pre-configured priority levels enable immediate transmission decisions without requiring time-consuming scheduling requests and grants, thus reducing scheduling delay while maintaining flexibility.
2Loss of energy
If semi-persistent scheduling is used for periodic transmissions, then scheduling overhead is reduced, but transmission flexibility and latency performance deteriorate
Solution Approach 1:
The patent introduces dynamic prioritization mechanisms that work alongside semi-persistent scheduling. The scheduling entity can dynamically adjust priority levels for SPS resources based on current traffic conditions, QoS requirements, and channel state, enabling flexible priority management without abandoning the overhead-reducing benefits of SPS.
Solution Approach 2:
The patent modifies the SPS configuration by adding priority parameters and enabling dynamic priority adjustment. This allows the system to change the behavioral parameters of SPS resources dynamically, transforming static SPS into a more adaptable mechanism that can respond to changing traffic conditions while maintaining reduced overhead.
3Loss of time
If uplink transmission opportunities are increased, then latency is reduced, but power consumption increases
Solution Approach 1:
The patent applies different priority levels and transmission strategies to different uplink traffic flows locally. High-priority traffic receives immediate transmission opportunities with lower latency, while low-priority traffic can tolerate delays and be transmitted during opportunistic moments. This localized differentiation reduces overall power consumption by avoiding unnecessary transmissions while meeting latency requirements for critical traffic.
Solution Approach 2:
The scheduling entity uses feedback from buffer status reports, QoS metrics, and channel conditions to dynamically adjust transmission priorities and opportunities. This feedback mechanism ensures that uplink transmissions occur only when necessary, optimizing the balance between latency reduction and power consumption by avoiding redundant transmissions.
4Reliability
If multiple uplink traffic types are prioritized dynamically, then QoS performance is improved, but scheduling complexity increases
Solution Approach 1:
The patent segments uplink traffic into distinct priority levels and traffic types, each with specific QoS requirements. By dividing the uplink scheduling problem into manageable priority segments, the system can apply simple priority-based rules to each segment rather than attempting complex holistic optimization, thus improving QoS performance while controlling scheduling complexity.
Solution Approach 2:
The patent introduces priority parameters as a new dimension for traffic differentiation. By adding this parameter to existing SPS and dynamic scheduling frameworks, the system can handle multiple traffic types with different QoS requirements using extended but still manageable scheduling logic, improving QoS performance without exponentially increasing complexity.
Data Source
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AI summary
Aspects of the disclosure relate to mechanisms for dynamic prioritization of uplink (UL) traffic at a user equipment (UE). In some examples, the UE may determine to delay transmission of UL traffic by skipping one or more UL transmission opportunities based on one or more factors, such as a power saving indication, a priority level of the UL traffic, a type of the UL traffic, a volume of the UL traffic, and/or current channel conditions. In some examples, the UE may be configured with a parameter controlling the ability of the UE to delay a transmission of UL traffic. In some examples, when the UE is operating in a semi-persistent scheduling mode and a power saving mode, such as a connected mode discontinuous reception (C-DRX) mode, the UE may dynamically interrupt an OFF duration of the C-DRX cycle to transmit UL traffic.