MBMS Reception in Cell-Based Wireless Systems
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Solution Overview
Problem
In multi-carrier wireless communication systems, the conventional method of providing multimedia broadcast/multicast services (MBMS) leads to increased overhead due to the transmission of unnecessary control information, especially when not all cells provide MBMS services, resulting in inefficient resource usage and increased reception overhead for user equipment (UE).
Innovation Solution
A method where a user equipment (UE) receives information about MBMS services from a second cell over a first channel, allowing it to obtain necessary information from a unicast cell and subsequently receive MBMS information from the second cell over a dedicated channel, thereby reducing the need for additional control channels and improving resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If control information about MBMS services is transmitted from all cells including those not providing MBMS, then UEs can receive complete MBMS information, but control information overhead increases
Solution Approach 1:
The patent applies local quality by differentiating the behavior of cells based on their MBMS service provision status. Cells providing MBMS services transmit MBMS control information, while cells not providing MBMS services do not transmit such information. This localized differentiation eliminates unnecessary control information transmission from non-MBMS cells, reducing overall overhead while maintaining information completeness for UEs that need it.
2Adaptability or versatility
If additional control channels are transmitted for MBMS services in multi-carrier systems, then MBMS service availability improves, but resource efficiency decreases
Solution Approach 1:
The patent utilizes the universality of the PDCCH by making it serve dual functions: traditional uplink scheduling and MBMS control information transmission. By configuring the PDCCH to transmit both uplink grants and MBMS control information, the system eliminates the need for separate dedicated control channels for MBMS, thereby improving resource efficiency while maintaining MBMS service availability across multi-carrier systems.
Data Source
AI summary
A method of receiving multimedia broadcast/multicast service (MBMS) information by a user equipment (UE) in a cell-based wireless communication system is provided. The method includes receiving information regarding a second cell from a first cell over a first channel, and receiving the MBMS information from the second cell over a second channel based on the received information regarding the second cell. Information regarding a cell that transmits multimedia broadcast/multicast service (MBMS) information is obtained from a cell that does not transmit the MBMS information, thereby eventually receiving the MBMS information. Therefore, an overhead caused by broadcasting of unnecessary MBMS control information can be reduced.