SC-MCCH Scheduling for NB-IoT Multicast Traffic
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Solution Overview
Problem
Current wireless communication technologies, particularly in Narrowband Internet of Things (NB-IoT), lack effective techniques for configuring Semi-Persistent Scheduling (SPS) in uplink and downlink transmissions, which is crucial for reducing power consumption and latency.
Innovation Solution
The implementation of a Single Cell Multicast Traffic Channel (SC-MTCH) scheduled via a Single Cell Multicast Control Channel (SC-MCCH), allowing for the transmission of scheduling configurations that indicate whether a single or multiple transport blocks are scheduled, enabling activation, deactivation, or modification of SPS configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for each transmission opportunity, then scheduling flexibility and resource management are improved, but signaling overhead increases and power consumption rises
Solution Approach 1:
The patent implements Semi-Persistent Scheduling (SPS) where scheduling decisions are made periodically rather than for every transmission opportunity. The network node determines scheduling parameters (time/frequency resources, modulation and coding schemes) at specific intervals and applies them repeatedly, reducing the frequency of signaling operations and thereby lowering power consumption while maintaining adequate scheduling flexibility.
Solution Approach 2:
The patent performs scheduling decisions in advance before transmission opportunities occur. The network node determines the scheduling configuration for multiple future transmission opportunities beforehand, allowing UEs to prepare their reception/ transmission activities ahead of time, reducing real-time processing requirements and power consumption during actual transmissions.
2Loss of time
If Semi-Persistent Scheduling is implemented to reduce signaling overhead, then power consumption and latency are reduced, but the ability to handle dynamic traffic requirements deteriorates
Solution Approach 1:
The patent introduces dynamic adjustment mechanisms for Semi-Persistent Scheduling. The network node can modify SPS parameters (such as scheduling period, time/frequency resources, and transport block size) based on observed traffic conditions and channel quality. This allows the system to maintain low latency benefits of SPS while adapting to varying traffic requirements through periodic parameter updates.
Solution Approach 2:
The patent implements feedback mechanisms where the network node monitors traffic conditions, channel quality, and UE performance metrics, then uses this information to adjust SPS parameters. The feedback loop enables the system to maintain optimal scheduling configurations that balance latency reduction with traffic adaptation capability, allowing dynamic response to changing conditions while preserving SPS efficiency.
Data Source
AI summary
A network node transmits a scheduling configuration, over a Single Cell Multicast Control Channel, that indicates whether a single transport block or multiple transport blocks of a Single Cell Multicast Traffic Channel are scheduled. The network node may then transmit a transport block in accordance with the scheduling configuration. Correspondingly, a user equipment receives the scheduling configuration. The UE may then receive a transport block in accordance with the scheduling configuration.