Sidelink Uplink Preemption via Priority Rankings
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively prioritizing and managing uplink and sidelink data transmissions, particularly in scenarios where ultra-reliable low latency communications (URLLC) need to preempt other data types due to their high priority, leading to potential collisions and interference in shared resources.
Innovation Solution
A method and apparatus for a scheduling entity to obtain priority rankings of uplink and sidelink data transmissions and schedule them using reserved sidelink resources, allowing URLLC data to preempt other data transmissions based on priority rankings and interference predictions to minimize collisions and ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If URLLC data transmission preempts eMBB data transmission using the same time-frequency resources, then the latency and reliability of URLLC communication is improved, but the data rate and throughput of eMBB communication deteriorates
Solution Approach 1:
The system dynamically changes transmission parameters including priority levels, resource allocation, and preemption indicators based on traffic type. When URLLC traffic arrives, the system changes the priority parameter to preempt eMBB resources, and uses preemption indicators to notify affected UEs about the resource takeover, thus ensuring URLLC reliability while managing eMBB throughput impact
Solution Approach 2:
The resource allocation system transitions from static to dynamic allocation based on real-time traffic conditions. The network can dynamically switch between granting resources to eMBB or URLLC traffic based on urgency, using dynamic priority assignment and preemption mechanisms that adapt resource distribution moment-by-moment according to service requirements
2Productivity
If sidelink resources are shared with uplink transmissions, then resource utilization efficiency is improved, but interference and collision between transmissions increases
Solution Approach 1:
The system implements feedback mechanisms where UEs report channel conditions, interference levels, and transmission status to the network. The network uses this feedback to dynamically adjust sidelink and uplink resource allocation, prioritize transmissions, and apply preemption when necessary, thus managing interference while maintaining high resource utilization
Solution Approach 2:
The network acts as an intermediary that coordinates between sidelink and uplink transmissions. It receives transmission requests from both sidelink UEs and uplink UEs, evaluates interference potential, and makes centralized scheduling decisions including preemption assignments to minimize collisions while maximizing overall resource utilization efficiency
3Loss of time
If dynamic preemption is implemented for high-priority traffic, then latency requirement fulfillment is improved, but system complexity and scheduling overhead increases
Solution Approach 1:
The system segments the communication service into different priority classes (URLLC and eMBB) with distinct handling mechanisms. Each segment has its own resource pool and priority rules, allowing simplified decision-making within each segment while the overall system manages complexity through hierarchical segmentation of traffic types and resource allocations
Solution Approach 2:
The system performs preliminary actions by pre-configuring resource pools, priority levels, and preemption rules before actual traffic arrives. URLLC resources are pre-identified and reserved, and preemption indicators are prepared in advance, enabling rapid latency-critical decisions without complex real-time calculations when high-priority traffic needs immediate transmission
Data Source
AI summary
Aspects relate to obtaining, at a first scheduled entity, a first priority ranking of first uplink (UL) data scheduled for transmission to a scheduling entity and a first data scheduled for transmission to a second scheduled data, as well as a second priority ranking of second data scheduled for transmission to a third and fourth scheduled entity, respectively. The scheduling uses at least a portion of a sidelink resource reserved for sidelink communication for the transmissions. The scheduling of the transmissions using at least the portion of the sidelink resource are based on the first priority ranking and the second priority ranking. Various transmission cancellation and reception preemptions are transmitted from transmitting scheduled entities to other transmitting or receiving scheduled entities, respectively. Such cancellations and preemptions are based on the priority rankings, prediction of data transmission collisions and prediction of interference at receiving entities.