MBMS Neighbor Cell Info Signaling Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for transmitting and receiving data in Broadcast and Multicast modes in MBMS systems face high signaling loads due to mutual exchanges of information between neighboring cells, leading to reduced system performance and increased data throughput, especially when a higher level of signaling occurs, which prolongs the time required to send MBMS neighbor cell information messages.
Innovation Solution
A system and method where a mobile station informs the network about the cells it is likely to reselect, allowing the network to prioritize and potentially avoid transmitting MBMS neighbor cell information messages for cells that will not be reselected, by appending base station identity codes and cell indexes of the highest signaling level BCCH carriers to an uplink RLC/MAC message, thereby reducing unnecessary signaling and speeding up information delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If MBMS neighbor cell information is transmitted for all neighboring cells, then complete information availability is improved, but signaling load increases and transmission time increases
Solution Approach 1:
Instead of transmitting MBMS neighbor cell information for all neighboring cells, the system transmits information only for a selected subset of neighboring cells. The network determines which cells to include based on criteria such as signal strength, cell type, or user location, thereby reducing the total quantity of signaling messages while maintaining sufficient information for effective cell reselection.
Solution Approach 2:
The system applies different information transmission strategies for different neighboring cells based on their local characteristics. Cells with stronger signal strength or higher priority receive MBMS neighbor cell information, while cells with weaker signals or lower priority may have information transmission skipped or delayed, optimizing the balance between information completeness and signaling efficiency.
2Loss of information
If MBMS neighbor cell information is transmitted for all neighboring cells, then complete information availability is improved, but transmission time increases
Solution Approach 1:
The system transmits MBMS neighbor cell information for only a selected subset of neighboring cells rather than all cells, thereby reducing the total transmission time required while maintaining sufficient information availability for effective cell reselection decisions.
Solution Approach 2:
The network performs preliminary determination of which neighboring cells require MBMS neighbor cell information transmission based on criteria such as signal strength, cell type, or user location. This preliminary selection is made before actual information transmission, allowing the system to optimize transmission timing and prioritize critical information delivery.
3Loss of information
If mutual exchange of information between neighboring cells is performed, then information completeness is improved, but signaling load increases
Solution Approach 1:
The system merges the determination of which cells to include with the actual information transmission process. The network simultaneously decides which neighboring cells require MBMS neighbor cell information and executes the transmission in an integrated manner, reducing the overhead of separate determination and transmission steps.
Solution Approach 2:
Instead of performing mutual exchange of information for all neighboring cells, the system performs the exchange only for a selected subset of cells determined by the network based on criteria such as signal strength, cell type, or user location, thereby reducing the total signaling load while maintaining information completeness for critical cells.
Data Source
AI summary
A system and method for minimizing signalling loads due to mutual exchanges of information between neighboring cells in which the same session is transmitted, and for reducing the time required to transmit MBMS neighbor cell information messages in a serving cell when a higher level of signalling occurs, wherein all broadcast control channel (BCCH) carriers indicated in a BCCH allocation are monitored by a mobile station (MS). A list of the cells having the strongest non-serving carriers is updated as often as the duration of the running average for measurements of the BCCH allocation. Base transceiver station identity codes (BSICs) and neighboring cell indexes of BCCH carriers are added to an uplink radio link control/medium access control (RLC/MAC) message that is transmitted to a network. As a result, the network is provided with the identity of which cell the mobile station is most likely to reselect to upon reception of the uplink RLC/MAC control message carrying the BSICs and neighboring cell indexes of the neighboring non-serving BCCH carriers of the mobile station.