Semi-Persistent Scheduling Traffic Stream Assignment
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Solution Overview
Problem
In wireless communication systems, the limited number of semi-persistent scheduling (SPS) flows restricts the assignment of traffic streams, leading to increased chances of packet collisions due to higher periodicity, fewer frequency resources, or lower priority assignments, especially when the number of traffic streams exceeds the number of SPS flows.
Innovation Solution
A user equipment (UE) determines a traffic stream for SPS flow based on parameters such as periodicity, number of frequency resources, and proximity service per packet priority (PPPP) value, allowing for optimal assignment to either SPS or one-shot transmissions to minimize packet collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of traffic streams exceeds the number of SPS flows, then more traffic can be transmitted, but packet collisions increase due to limited SPS flow assignments
Solution Approach 1:
The patent segments traffic streams into different categories based on their characteristics (periodicity, frequency resources, priority) and assigns them to different transmission modes (SPS flow or one-shot transmission). This segmentation allows the system to handle more traffic streams than available SPS flows by routing some to one-shot transmission, thereby increasing overall traffic capacity while maintaining reliability for SPS-assigned traffic.
Solution Approach 2:
The patent introduces an intermediary selection mechanism that determines whether a traffic stream should be assigned to an SPS flow or use one-shot transmission. This intermediary decision layer resolves the conflict between limited SPS flow resources and excess traffic streams by providing a systematic way to distribute traffic across both transmission modes, optimizing both productivity and reliability.
2Quantity of substance
If traffic streams are assigned to SPS flows with higher periodicity, then fewer frequency resources are needed, but packet collisions increase
Solution Approach 1:
The patent applies local quality by evaluating individual traffic stream characteristics (periodicity, frequency resource requirements, priority) and making localized assignment decisions. Traffic streams with higher periodicity and lower resource requirements are assigned to SPS flows, while those with lower periodicity or higher requirements use one-shot transmission. This localized approach optimizes frequency resource usage while minimizing packet collisions by matching traffic characteristics to appropriate transmission modes.
3Adaptability or versatility
If traffic streams with lower priority are assigned to SPS flows, then more high-priority traffic can use one-shot transmission, but overall system efficiency decreases
Solution Approach 1:
The patent changes the assignment parameters by considering multiple factors simultaneously: periodicity, frequency resource requirements, and priority levels. The selection mechanism dynamically adjusts which traffic streams receive SPS flow assignment based on these parameter combinations. By changing the assignment criteria to prioritize traffic with higher periodicity and lower resource needs, the system maintains adaptability while improving overall transmission efficiency through optimized SPS flow utilization.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a traffic stream, from among a plurality of traffic streams, for a semi-persistent scheduling (SPS) flow of a plurality of SPS flows based at least in part on one or more parameters associated with the traffic stream, wherein the one or more parameters include one or more of a periodicity associated with the traffic stream, a number of frequency resources associated with the traffic stream, or a proximity service per packet priority (PPPP) value associated with the traffic stream, and wherein a number of the plurality of traffic streams is greater than a number of the plurality of SPS flows. The UE may transmit traffic of the traffic stream in accordance with the SPS flow. Numerous other aspects are described.