Semi-Persistent TTI Scheduling With Multiple SPS Identifiers
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Solution Overview
Problem
In wireless communication networks, scheduling conflicts occur due to the use of semi-persistent scheduling (SPS) with varying transmission time intervals (TTIs), leading to inefficiencies and potential interference.
Innovation Solution
Implementing a system that allows for the determination and assignment of multiple SPS radio network identifiers (RNI) for different TTIs, enabling flexible resource allocation and reducing scheduling conflicts by associating resource assignments with specific TTI lengths based on location and using opportunistic muting or rule-based SPS occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple semi-persistent scheduling assignments with different TTI lengths are supported, then service flexibility and adaptability are improved, but device complexity and scheduling overhead increase
Solution Approach 1:
The patent segments the scheduling mechanism by introducing separate RRC parameters for each TTI length (shortTTI-SPS-AperiodicCSI, shortTTI-SPS-DedicatedRA, shortTTI-SPS-DownlinkAssignmentIndex, etc.), allowing independent configuration for different TTI lengths without interfering with each other. This segmentation enables the system to support multiple TTI lengths while maintaining manageable complexity through modular parameter management.
Solution Approach 2:
The patent adds a new dimension to the scheduling system by introducing a TTI length dimension alongside the existing resource allocation dimensions. By defining separate parameter sets for each TTI length category (normal, short, ultra-short), the system can selectively activate appropriate parameter groups based on service requirements, effectively managing complexity through dimensional separation.
2Manufacturing precision
If separate RRC parameters are configured for each TTI length, then configuration precision is improved, but information overhead increases
Solution Approach 1:
The patent implements dynamic parameter configuration where the set of active RRC parameters changes based on the selected TTI length. The system dynamically activates only the parameter sets relevant to the current TTI length (normal, short, or ultra-short), rather than maintaining all parameters simultaneously. This dynamic approach provides precise configuration for each TTI type while reducing the effective parameter overhead at any given time.
Solution Approach 2:
Different RRC parameter sets are assigned to different TTI length categories, with each parameter set containing only the parameters specific to that TTI type. For example, shortTTI-specific parameters (shortTTI-SPS-AperiodicCSI, shortTTI-SPS-DedicatedRA) are separated from normal TTI parameters. This local quality approach ensures precise configuration for each TTI length while avoiding the overhead of transmitting unnecessary parameters.
Data Source
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AI summary
Apparatuses, methods, and systems are disclosed for scheduling of transmission time intervals. One apparatus (300) includes a processor (302) that determines (1002) a first semi-persistent scheduling resource assignment indicating a set of resources including multiple time domain resources. Each time domain resource of the multiple time domain resources has a first transmission time interval length. The processor (302) also determines (1004) a second semi-persistent scheduling resource assignment indicating a set of resources including multiple time domain resources. Each time domain resource of the multiple time domain resources has a second transmission time interval length, and the first transmission time interval length is different from the second transmission time interval length. The apparatus (300) includes a transmitter (310) that transmits (1006) the first semi-persistent scheduling resource assignment using a first semi-persistent scheduling identifier, and transmits (1008) the second semi-persistent scheduling resource assignment using a second semi-persistent scheduling identifier.