sTTI Resource Scheduling via Semi-Persistent Configuration
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Solution Overview
Problem
Current LTE systems face limitations in flexibility and resource wastage due to conventional methods of configuring and reconfiguring short transmission time intervals (sTTI) resources, which restricts the ability to meet latency reduction requirements.
Innovation Solution
A resource scheduling method that utilizes semi-persistent scheduling (SPS) configuration information to determine and activate sTTI resources, allowing for flexible adjustment and notification of activated resources between the base station and terminal, thereby improving scheduling flexibility and reducing reconfiguration time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number and locations of sTTI resources to be activated are configured by the upper layer using a conventional method, then the configuration is simple, but the flexibility of the sTTI resource scheduling is restricted and resources may be wasted
Solution Approach 1:
The patent implements dynamic sTTI resource activation by allowing the lower layer scheduler to activate specific sTTI resources within a subframe based on real-time conditions, rather than static upper-layer configuration. The base station can dynamically determine which sTTI resources to activate and notify the terminal through physical layer signaling, enabling flexible adaptation to changing traffic conditions while maintaining a simple upper-layer configuration framework.
2Productivity
If the number and locations of sTTI resources to be activated need to be adjusted, reconfiguration by the upper layer is needed, but this increases the time for reconfiguration and may not meet the requirement of latency reduction
Solution Approach 1:
The patent applies preliminary action by having the upper layer pre-configure the set of available sTTI resources in advance, so that when reconfiguration is needed, the lower layer can immediately activate different resources from this pre-configured set without requiring additional upper-layer signaling. This eliminates reconfiguration delay while maintaining flexibility, as the lower layer can dynamically select and activate appropriate sTTI resources based on current conditions.
3Speed
If the TTI is reduced to an sTTI, then the latency is reduced, but one subframe may include multiple sTTI resources which complicates the resource scheduling
Solution Approach 1:
The patent segments the subframe into multiple sTTI resources, each with its own activation status. The lower layer scheduler can independently control which sTTI resources are activated within a subframe, allowing fine-grained resource management. This segmentation enables the system to achieve low latency through short sTTI while managing complexity by using simple activation/deactivation control mechanisms rather than complex scheduling algorithms.
Data Source
AI summary
A resource scheduling method for use in a base station, includes: receiving semi-persistent scheduling (SPS) configuration information sent by a radio resource control (RRC) layer, the SPS configuration information including a period of SPS, the period of the SPS indicating a time interval between two adjacent scheduling subframes; determining a short transmission time interval (sTTI) resource activated in a target scheduling subframe according to the SPS configuration information and reference information; and providing an activation parameter to a physical layer according to the sTTI resource activated in the target scheduling subframe, such that the physical layer generates an activation notification containing the activation parameter for notifying a terminal of the sTTI resource activated in the target scheduling subframe.