Scheduling Request Handling for URLLC in New Radio Systems
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Solution Overview
Problem
Cellular networks face challenges in reliability and capacity, particularly in scenarios with high demand for mobile services and high data rates, where exchanging control and performance information between base stations and mobile devices becomes demanding, leading to performance issues like latency and reliability concerns.
Innovation Solution
The implementation of advanced communication techniques and network architectures, including the use of Next Generation Node-Bs (gNBs) and evolved Node-Bs (eNBs) within 3GPP, LTE, LTE-A, NR, and 5G networks, which incorporate features like ultra-reliable low latency communication (URLLC) and efficient resource allocation methods to manage data and control information effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If advanced communication techniques and network architectures (gNBs, eNBs, URLLC features) are implemented, then network reliability and capacity are enhanced, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the scheduling request handling into distinct phases: detection of SR opportunity, determination of PUCCH resource availability, and conditional transmission or cancellation decisions. This segmentation allows complex URLLC requirements to be managed through modular, step-by-step processing in both UE and gNB, reducing implementation complexity while maintaining high reliability
Solution Approach 2:
The patent implements preliminary actions by pre-configuring PUCCH resources and SR opportunities through RRC signaling before actual data transmission is needed. The UE is pre-informed of available SR resources and timing, allowing it to make rapid scheduling requests when URLLC data arrives without performing complex real-time resource allocation, thus enhancing reliability while managing device complexity
2Loss of time
If efficient resource allocation methods are used to manage data and control information, then latency is reduced, but control information exchange complexity increases
Solution Approach 1:
The patent extracts the scheduling request mechanism from general uplink resource allocation by dedicating specific PUCCH resources and SR opportunities for URLLC traffic. This extraction allows scheduling requests to be handled through a simplified, specialized path that reduces latency without requiring complex general-purpose resource allocation procedures, thereby managing control information exchange complexity
Solution Approach 2:
The patent implements dynamic SR cancellation based on real-time PUCCH resource availability. When URLLC data arrives and immediate PUCCH resources are unavailable, the UE dynamically cancels pending SRs rather than following rigid scheduling procedures. This dynamic approach reduces latency by adapting to current network conditions while maintaining manageable complexity through rule-based decision logic
Data Source
AI summary
Embodiments of a User Equipment (UE) and methods of communication are generally described herein. The UE may, if a regular buffer status report (BSR) is triggered and a logical channel scheduling request (SR) delay timer is not running, and if available uplink shared channel (UL-SCH) data resources do not meet one or more logical channel prioritization (LCP) mapping restrictions configured for a logical channel of uplink data: trigger a scheduling request to request UL-SCH data resources for a new transmission of uplink data. Currently pending SRs and BSRs may not be cancelled after assembly of a medium access control (MAC) protocol data unit (PDU), but may be cancelled at a later time when a MAC PDU including a BSR is transmitted.