NB-IoT Multicast Scheduling via Data Channel Priority
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Solution Overview
Problem
Current wireless communication systems, particularly NarrowBand-Internet of Things (NB-IoT), face challenges in efficiently supporting multicast and broadcast transmissions due to limited time and frequency resources, leading to potential signal overlap and inefficient resource utilization.
Innovation Solution
The proposed method configures multiple frequency resources for multicast traffic channels, allowing for efficient multicast transmission by carrying scheduling information in the data channel region rather than the control channel region, and prioritizes signals to prevent overlap, ensuring that user equipment (UE) can receive all transmitted signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scheduling information is carried in the control channel region, then control information can be transmitted reliably, but resource utilization efficiency deteriorates due to limited control channel resources in NB-IoT
Solution Approach 1:
The patent uses the data channel as an intermediary to carry scheduling information for multicast/broadcast services. Instead of directly using limited control channel resources, the invention transports control information through the data channel region, which has abundant resources, thereby resolving the contradiction between reliable control information transmission and efficient resource utilization.
2Area of stationary object
If multiple signals are transmitted simultaneously in limited time-frequency resources, then service coverage is improved, but signal overlap occurs leading to reception failure
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority relationships between different signals before transmission occurs. When signal overlap is detected, the UE can immediately apply the pre-established priority rules to determine which signal to receive, preventing reception failure without requiring complex real-time arbitration mechanisms.
3Adaptability or versatility
If NB-IoT supports multicast and broadcast transmissions, then service versatility is improved, but resource constraints are exacerbated
Solution Approach 1:
The patent makes the data channel multi-functional by enabling it to carry both user data and scheduling control information for multicast/broadcast services. This universal usage of the data channel region allows NB-IoT to support diverse services including unicast, multicast, and broadcast transmissions without requiring separate dedicated control resources for each service type.
Data Source
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AI summary
The present invention discloses a method for transmitting/receiving data in a wireless communication system supporting NB-IoT and a device for the method. More specifically, the method comprises receiving a first NPDCCH through a first search space; receiving a first NPDSCH carrying an SC-MCCH; receiving a second NPDCCH through a second search space; receiving a second NPDSCH carrying an SC-MTCH; and when a time period configured for at least one of a third NPDCCH or a third NPDSCH overlaps at least one of the first search space, a time period configured for the first NPDSCH, the second search space, or a time period configured for the second NPDSCH, preferentially receiving at least one of the third NPDSSCH or the third NPDSCH, wherein the third NPDCCH and the third NPDSCH are channels configured for either paging or random access.