Semi-Persistent Scheduling Symbol-Level Resource Allocation
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Solution Overview
Problem
In the LTE system, semi-persistent scheduling (SPS) experiences low resource utilization and high transmission delays due to fixed subframe-based data transmission, leading to inefficient use of time-frequency resources.
Innovation Solution
A method that determines semi-persistent scheduling configuration parameters including SPS period length, symbol information, and activation commands to restrict time-frequency resources to specific symbols within a subframe, allowing for flexible resource allocation and reducing transmission delays by using symbol-level resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SPS data is transmitted in form of a subframe, then resource allocation is simplified, but resource utilization becomes low and transmission delay increases
Solution Approach 1:
The patent segments the subframe structure by introducing symbol-level resource allocation within subframes. Instead of allocating resources at the subframe level only, the system now allocates resources at the symbol level (0-13) within each subframe, creating finer-grained time-frequency resource units that can be independently assigned to SPS data transmissions.
Solution Approach 2:
The patent adds a new dimension to resource allocation by introducing the symbol index dimension (0-13) within the existing subframe dimension. This transforms the resource allocation from a two-dimensional subframe-based structure to a three-dimensional structure incorporating symbol-level granularity, enabling more flexible and efficient resource utilization.
2Device complexity
If SPS data is transmitted in form of a subframe, then resource allocation is simplified, but transmission delay becomes fixed at 1 ms
Solution Approach 1:
The patent segments the fixed 1 ms subframe transmission interval into variable symbol-level time units. By allocating resources at the symbol level (0-13) within subframes, the system enables transmission delays to be adjusted in symbol increments rather than being fixed at the subframe level, achieving flexible delay adaptation for different service requirements.
Solution Approach 2:
The patent transforms the static, fixed 1 ms transmission delay into a dynamic, adjustable parameter. The system can now adapt transmission delays dynamically by selecting different symbol positions and quantities within subframes based on real-time service requirements, making the SPS mechanism flexible enough to handle both low-delay and high-delay scenarios.
3Productivity
If symbol information is added to SPS configuration, then resource utilization improves, but configuration complexity increases
Solution Approach 1:
The patent applies local quality by adding symbol information specifically to the SPS configuration parameters where it is most needed for resource optimization. The symbol information (symbol start position and symbol quantity) is localized within the SPS configuration structure, allowing fine-grained control of resource allocation without requiring complete reconfiguration of the entire system.
Solution Approach 2:
The patent changes the configuration parameters by adding two new parameters: symbol start position (indicating the starting symbol index 0-13) and symbol quantity (indicating the number of symbols to allocate). These parameter additions enable precise control over time-frequency resource allocation at the symbol level while maintaining compatibility with existing SPS frameworks.
Data Source
AI summary
A semi-persistent scheduling method includes: determining a semi-persistent scheduling (SPS) configuration parameter, where the SPS configuration parameter includes an SPS period length, symbol information, and an SPS activation command, where the SPS activation command is used to indicate a system frame number and a subframe number of a first time-frequency resource available for sending or receiving SPS data, and the symbol information is used to indicate a location of a symbol that is in a subframe and that is occupied by the first time-frequency resource; determining resource locations of time-frequency resources available for sending or receiving the SPS data based on the SPS period length, the symbol information, and the SPS activation command; and sending, by the network device, the SPS configuration parameter to a terminal device. Resource utilization of semi-persistent scheduling can be improved, and a transmission delay of the SPS data can be reduced.