Radio Terminal MBMS Reception in Reduced Bandwidth
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Solution Overview
Problem
Current radio terminals for Machine Type Communication (MTC) and Internet of Things (IoT) services lack an efficient mechanism to receive multicast/broadcast services using MBMS, particularly in scenarios where bandwidth is reduced, leading to increased power consumption and limited coverage.
Innovation Solution
The implementation of specific configurations and protocols in the LTE system, including the introduction of MPDCCH and NPDCCH for reduced bandwidth scenarios, and optimized operation patterns for SC-PTM reception, such as direct indication of service updates and reduced bandwidth PDCCH, allow for efficient MBMS service reception with minimized power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If radio terminals use reduced bandwidth for MTC and IoT services, then device cost and power consumption are reduced, but the ability to efficiently receive multicast/broadcast services using MBMS deteriorates
Solution Approach 1:
The patent segments the MBMS reception process into distinct phases: service announcement reception via SC-MCCH, service activation indication via PDCCH, and actual service data reception via PDSCH. This segmentation allows the terminal to selectively engage with MBMS services based on interest and power availability, rather than continuously monitoring all MBMS transmissions.
Solution Approach 2:
The patent implements preliminary action by having the base station broadcast service announcement information in advance through SC-MCCH. Terminals can review this information beforehand to determine which services they are interested in, enabling them to activate only relevant services and avoid unnecessary power consumption from monitoring unrelated MBMS transmissions.
2Reliability
If radio terminals continuously monitor MBMS service information, then service reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action through the structured timing of MBMS information broadcasts. The base station periodically transmits service announcement information via SC-MCCH and uses periodic PDCCH indications for service activation. Terminals monitor these periodic transmissions rather than continuously processing all MBMS data, ensuring reliable service detection while minimizing power consumption through间断性 monitoring.
3Adaptability or versatility
If radio terminals activate multiple MBMS services, then service coverage and functionality are improved, but processing complexity and power consumption increase
Solution Approach 1:
The patent uses preliminary action by providing service announcement information in advance through SC-MCCH, allowing terminals to evaluate multiple services before activation. The base station includes service identifiers, transmission parameters, and resource allocation information in advance, enabling terminals to make informed decisions about which services to activate based on their specific needs and power availability.
Solution Approach 2:
The patent implements feedback mechanisms where terminals report their service reception status and power status to the base station. The base station uses this feedback to adjust service activation indications and resource allocation, enabling dynamic service management that adapts to terminal capabilities and conditions, thereby reducing processing complexity while maintaining service functionality.
Data Source
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AI summary
A radio terminal according to a first aspect is a radio terminal for a mobile communication system. The radio terminal includes a transceiver configured to transmit and receive a radio signal within a reduced bandwidth narrower than a system transmission and reception band, and a controller configured to perform radio communication with a base station by using the transceiver. The controller performs a process of receiving, from the base station within the reduced bandwidth, information necessary for receiving an MBMS service provided via the base station.