MBMS Scheduling Information Exchange in Shared Frequency Bands
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Solution Overview
Problem
In cellular systems, the rapid increase in traffic leads to concerns about frequency band exhaustion, making it difficult to provide Multicast Broadcast Multimedia Services (MBMS) using unlicensed frequency bands, as base stations struggle to synchronize and perform MBMS transmission independently in shared frequency bands.
Innovation Solution
An apparatus that includes a control entity providing scheduling information for MBMS transmission to multiple base stations within an MBMS area, allowing them to synchronize and perform MBMS transmission using shared frequency bands, and a mechanism for frame synchronization to ensure coordinated radio frame timing across different cellular systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If base stations use unlicensed frequency bands independently for MBMS transmission, then frequency band utilization is improved, but synchronization capability deteriorates
Solution Approach 1:
A synchronization signal is introduced as an intermediary element between base stations using unlicensed frequency bands. This synchronization signal enables base stations to achieve timing alignment and coordinate their MBMS transmissions without requiring dedicated licensed control channels, thus resolving the contradiction between independent frequency band usage and synchronization capability
Solution Approach 2:
The transmission framework is segmented into distinct components: synchronization signal transmission, MBMS data transmission, and resource allocation. This segmentation allows base stations to independently utilize unlicensed bands for MBMS while relying on the standardized synchronization signal for coordination, separating the functions that were previously coupled
2Ease of operation
If base stations perform MBMS transmission independently in shared frequency bands, then device autonomy is improved, but service coordination deteriorates
Solution Approach 1:
A feedback mechanism is established where base stations monitor and report their transmission status, resource usage, and synchronization state. This feedback enables the network to coordinate MBMS services across multiple base stations using unlicensed bands, preventing service duplication and ensuring proper resource allocation while maintaining base station autonomy
3Quantity of substance
If unlicensed frequency bands are used for MBMS, then frequency resource availability is improved, but transmission reliability deteriorates
Solution Approach 1:
Synchronization signals and resource allocation patterns are established in advance before MBMS transmission begins on unlicensed frequency bands. This preliminary configuration ensures that base stations are pre-coordinated and can reliably execute their transmission plans, mitigating the inherent unreliability of unlicensed band operations
Data Source
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AI summary
[Object] To enable provision of a service of MBSFN using frequency bands shared by a plurality of radio communication systems. [Solution] There is provided an apparatus, including: a first control unit configured to acquire scheduling information for MBSFN transmission in a frequency band shared by a plurality of radio communication systems and provide the scheduling information to two or more base stations belonging to an MBSFN area for the MBSFN transmission.