SPS Assistance Information for Data Transmission Delay Reduction
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Solution Overview
Problem
Existing data transmission methods in device-to-device and vehicle-to-everything communications experience significant delays due to inefficient resource allocation and unpredictable data packet arrival times, leading to increased transmission latency.
Innovation Solution
The method involves determining Semi-Persistent Scheduling (SPS) assistance information based on N data packets at layer 2, which includes frame and subframe numbers corresponding to a moment offset, allowing for accurate prediction of data packet arrival times and reducing transmission delays by enabling SPS resource allocation without the need for explicit scheduling requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional scheduling request (SR) and buffer status report (BSR) mechanisms are used for uplink data transmission, then resource allocation can be achieved, but transmission delay increases significantly
Solution Approach 1:
The base station pre-allocates semi-persistent scheduling (SPS) resources to the UE based on predicted data arrival patterns. The UE determines SPS assistance information including moment offset based on N historical data packets before actual data transmission, enabling the base station to proactively reserve resources in advance rather than reacting to scheduling requests after data arrives.
Solution Approach 2:
The UE autonomously determines SPS assistance information based on its own data packet characteristics and historical patterns. The UE calculates moment offset from N data packets at layer 2 and selects appropriate SPS resources without requiring continuous base station intervention or complex scheduling request exchanges, making the system self-organizing.
2Measurement precision
If moment offset prediction is performed without considering data packet fluctuation, then resource allocation is simplified, but prediction accuracy deteriorates
Solution Approach 1:
The UE performs preliminary analysis of N data packets to determine statistical characteristics including moment offset, average packet interval, and variability metrics before SPS resource allocation. This advance characterization enables accurate prediction of future data arrival times while the base station uses these pre-computed statistics to allocate resources appropriately.
Solution Approach 2:
The system dynamically adjusts SPS parameters including moment offset, periodicity, and resource allocation based on the statistical characteristics derived from N data packets. The UE monitors data packet patterns and updates SPS assistance information to adapt to changing traffic conditions, optimizing prediction accuracy for different service types.
3Productivity
If semi-persistent scheduling (SPS) resources are allocated without accurate moment offset prediction, then resource allocation is faster, but resource utilization efficiency decreases
Solution Approach 1:
The UE determines SPS assistance information including moment offset in advance based on N data packets before actual data transmission occurs. This preliminary determination allows the base station to allocate SPS resources immediately when data arrives, eliminating the need for scheduling request delays while ensuring resources are allocated at the optimal moment for efficient utilization.
Data Source
AI summary
According to various embodiments, a data transmission method and apparatus are provided in this application. In one embodiment, user equipment (UE) determines SPS assistance information based on N data packets at layer 2, where the SPS assistance information includes a frame number and a subframe number that correspond to a moment offset, wherein service features corresponding to the N data packets are the same, and wherein each of the service features includes at least a period configured by a base station for the UE. The moment offset of the data packets can be accurately predicted, and then the SPS assistance information is determined based on the frame number and the subframe number that correspond to the relatively accurate moment offset, to reduce impact of data packet fluctuation on a transmission delay. In addition, the UE can obtain an SPS resource without reporting an SR, so that the data transmission delay can be reduced.