SR and PUSCH Priority Handling Without Logical Channel Association
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Solution Overview
Problem
Existing wireless communication systems face challenges in prioritizing uplink transmissions, particularly for critical traffic, due to conflicts between non-critical and critical uplink control information, leading to delayed or dropped critical transmissions and unreliable HARQ-ACKs, without clear prioritization rules for MAC CEs and PHY-index-based priorities.
Innovation Solution
Implementing prioritization methods for scheduling requests (SR) and physical uplink shared channel (PUSCH) without Logical Channel (LCH) association, using PHY-index-based priority determination for SR and PUSCH, and adjusting MAC CE priorities to ensure critical transmissions are prioritized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-critical uplink data transmissions are allowed to overlap with uplink control information, then resource utilization is improved, but critical traffic transmission reliability deteriorates due to dropping of critical transmissions
Solution Approach 1:
The patent applies preliminary action by establishing prioritization rules before conflicts occur. The MAC entity determines priorities of uplink grants and scheduling requests based on logical channel priorities and PHY priority indices in advance, and resolves conflicts by selecting or pre-empting transmissions according to these pre-established rules, preventing critical traffic dropping before it happens
Solution Approach 2:
The patent segments the prioritization process into two distinct layers: MAC layer prioritization (based on logical channel priorities) and PHY layer prioritization (based on PHY priority indices). This segmentation allows each layer to handle different aspects of conflict resolution independently, enabling non-critical data to be transmitted when appropriate while protecting critical transmissions through dedicated priority mechanisms
2Loss of information
If scheduling request for critical transmission is delayed to include information in buffer status report, then more information can be conveyed, but transmission latency increases because BSR reception takes longer time compared to short SR
Solution Approach 1:
The patent applies dynamics by making the scheduling request mechanism adaptable to different scenarios. The MAC entity dynamically determines whether to send a scheduling request or wait for buffer status report based on the priority of the logical channel and the amount of data to be transmitted. For high-priority critical traffic, the system dynamically selects the faster SR path, while for lower-priority traffic with larger data volumes, it allows the more informative BSR path
Solution Approach 2:
The patent changes the priority parameter assignment based on traffic characteristics. By associating different priority levels with different logical channels and configuring corresponding PHY priority indices, the system can adjust the behavior of the scheduling request mechanism to match the urgency and information requirements of different traffic types
3Productivity
If uplink control information is multiplexed on physical uplink shared channel, then resource efficiency is improved, but HARQ-ACK reliability or latency is affected
Solution Approach 1:
The patent segments HARQ-ACK transmissions into two categories: those that can be multiplexed on PUSCH and those that should be transmitted independently. The MAC entity determines the priority of uplink grants and decides whether to multiplex UCI based on this priority and the presence of higher-priority transmissions. This segmentation ensures that critical HARQ-ACK feedback maintains reliability through independent transmission while non-critical feedback can be efficiently multiplexed
4Adaptability or versatility
If configured grant is overridden by overlapping dynamic grant, then dynamic scheduling flexibility is improved, but critical uplink transmission robustness deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority indices for different types of grants and scheduling requests. The MAC entity uses these pre-assigned priorities to determine whether a dynamic grant should override a configured grant before the override occurs. This preliminary priority assignment ensures that critical configured grants (with high priority indices) are protected from being overridden by less critical dynamic grants
Solution Approach 2:
The patent makes the grant override mechanism dynamic by allowing the MAC entity to evaluate the priorities of overlapping grants in real-time. Based on the determined priorities and the specific transmission context, the system dynamically decides whether to allow the override or protect the configured grant, enabling flexible adaptation to different traffic scenarios while maintaining robustness for critical transmissions
Data Source
AI summary
Embodiments under the present disclosure include systems and methods for prioritization for SR and PUSCH without LCH association. For example, certain embodiments can comprise a method performed by a wireless device for priority handling of SR and PUSCH without LCH association. The method can comprise the wireless device determining that the SR and PUSCH are not related to a LCH and determining a priority of the SR and PUSCH.