MBMS Control Information Transmission Bandwidth Adaptation
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Solution Overview
Problem
In mobile communication systems, user equipment (UE) with a smaller bandwidth than the cell transmission bandwidth cannot efficiently receive MBMS control information without retuning its receiver, leading to increased power consumption and reduced flexibility in resource allocation.
Innovation Solution
A method for dynamically activating and modifying MBMS control information transmission to match the portion of the cell bandwidth used for MBMS services, allowing UE with smaller bandwidth to receive information within its reception range, reducing signaling overheads and battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If MBMS control information is transmitted in the center of the cell bandwidth, then the transmission is simplified and resource allocation is easier, but user equipment with smaller bandwidth cannot receive the information without retuning its receiver
Solution Approach 1:
The cell bandwidth is divided into multiple portions, each capable of carrying MBMS control information. Instead of transmitting control information in a single central location, the system segments the bandwidth and distributes control information across multiple portions, allowing UE with different bandwidth capabilities to receive information in their respective portions without retuning.
Solution Approach 2:
Different portions of the cell bandwidth are assigned different functions or properties. Specifically, certain frequency portions are designated to carry MBMS control information while others carry data, and this allocation is adapted based on UE bandwidth capabilities. This local differentiation enables UE with smaller bandwidth to access control information without needing to retune across the entire cell bandwidth.
2Reliability
If UE continuously monitors MBMS control information to detect service changes, then service updates are detected promptly, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic transmission of MBMS control information with specific periodicity. UE can enter sleep modes between periodic transmissions and only wake up to check for updates, significantly reducing power consumption while maintaining reliable detection of service changes through the periodic monitoring schedule.
Solution Approach 2:
The system implements feedback mechanisms where UE can indicate interest in specific MBMS services, and the network responds by providing targeted control information. This feedback-based approach allows UE to monitor only relevant control information rather than continuously scanning all MBMS control channels, reducing power consumption while maintaining reliable service update detection.
Data Source
AI summary
The present invention relates to multimedia broadcast and multicast services, MBMS, in a cell wherein variable transmission bandwidth is employed. In particular the invention relates to transmission of MBMS control information relating to broadcast and multicast services. According to the method and arrangement of the invention the manner in which the transmission of MBMS control information is performed and/or the content of the MBMS control information is determined based on the amount and the portion of the cell bandwidth that is used for MBMS transmission.