Carrier Aggregation for MBMS in LTE-Advanced Mobile Stations
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Solution Overview
Problem
Carrier aggregation techniques have not been applied to Multimedia Broadcast/Multicast Services (MBMS) in LTE-Advanced (LTE-A) communication systems, limiting the ability to establish high-speed and large-capacity data communication for MBMS.
Innovation Solution
A mobile station and base station communicate using carrier aggregation with multiple component carriers, allowing MBMS to be received and displayed by synchronizing and decrypting information across different frequency bands, enabling MBMS during carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation technique is used for unicast communication in LTE-A, then high-speed and large-capacity data communication is achieved, but MBMS cannot be applied during carrier aggregation
Solution Approach 1:
The MBMS service is segmented across multiple component carriers. The patent divides the broadcast/multicast content into multiple streams that are transmitted simultaneously over different component carriers (e.g., CC1 and CC2), allowing the mobile station to receive and combine these segments to reconstruct the complete MBMS service while maintaining carrier aggregation for high-speed unicast communication.
Solution Approach 2:
The mobile station is designed with multi-functional capability to simultaneously handle both unicast and MBMS services over carrier aggregation. The device can perform standard carrier aggregation for unicast traffic while also receiving, synchronizing, and processing MBMS content across the same aggregated carriers, making the system universal in supporting both communication modes without mutual exclusion.
2Adaptability or versatility
If a single component carrier is used for MBMS, then MBMS service is provided, but bandwidth is limited and cannot achieve high-speed communication
Solution Approach 1:
Multiple component carriers are merged to provide MBMS service. The patent combines the bandwidth resources of multiple component carriers (e.g., 20 MHz each) to deliver MBMS content over an aggregated bandwidth (e.g., 40 MHz or more), thereby achieving both high-speed communication capability and MBMS service support simultaneously through the merging of frequency resources.
Solution Approach 2:
The patent transitions from single-carrier MBMS to multi-carrier MBMS by adding the frequency dimension. Instead of expanding bandwidth on a single carrier, the system utilizes multiple carriers across different frequency bands, effectively using the frequency dimension to achieve both wide bandwidth for high-speed communication and comprehensive MBMS service coverage.
3Productivity
If multiple component carriers are used for MBMS, then high-speed and large-capacity communication is achieved, but synchronization and management complexity increases
Solution Approach 1:
The mobile station implements feedback mechanisms to monitor and report synchronization status, signal quality, and reception status for each component carrier. This feedback enables the system to dynamically adjust transmission parameters, maintain optimal synchronization across multiple carriers, and manage the complexity of multi-carrier MBMS through continuous information exchange between the base station and mobile station.
Solution Approach 2:
The patent introduces intermediary synchronization signals and reference signals that facilitate coordinated operation across multiple component carriers. These intermediary elements act as mediators that enable the mobile station to synchronize with multiple carriers simultaneously by providing common timing and frequency references, thereby reducing the management complexity of multi-carrier MBMS operations.
Data Source
AI summary
A mobile station is provided to which multimedia broadcast/multicast service can be applied also during carrier aggregation. A mobile station communicates with a base station by carrier aggregation using a plurality of component carriers having different frequency bands. The mobile station receives contents in MBMS from the base station using at least two component carriers of a plurality of component carriers. The mobile station causes a display to display the received contents.