Multimedia broadcast multicast service transmission method and system

Abstract

The invention discloses a transmission method and a system for multimedia broadcast-multicast services (MBMS). The method and the system use a frequency resource occupied by a special time slot in a carrier wave frame structure carrying MBMS to transmit and fill downlink synchronous signals of a long cyclic prefix (CP) down, and use the special time slot not occupied by the downlink synchronous signals and the frequency resource occupied by the service time slot to transmit MBMS data and control signaling down. The method and the system can the downlink synchronous signals using the long CP, thereby, the method and the system can be suitable for transmitting MBMS in a long-term evolution research project LTE system and can improve the transmission efficiency of the MBMS.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a transmission technology of multimedia broadcast and multicast services. Background technique [0002] At present, the unicast service (Unicast service) can no longer meet the growing business demands of operators and users. In order to support the growing business demands of operators and users, the Third Generation Partnership Project (3GPP, Third Generation Partnership Projects) and its In 2005, the third generation (3G, 3rd Generation) long-term evolution research project (LTE, Long Term Evolution) was launched, and the transmission of the multimedia broadcast multicast service (MBMS, Multimedia Broadcast Multicast Service) was studied. [0003] 3GPP and its LTE are dedicated to transmitting MBMS services by building another wireless network frequency layer within the coverage area of ​​the existing Universal Mobile Telecommunications System (UMTS, Universal Mobile Tel...

AI Technical Summary

Problems solved by technology

[0006] LTE is a system based on OFDM technology, and OFDM technology is very sensitive to frequency offset. Therefore, when transmitting MBMS services in the LTE system, each dedicated carrier carrying MBMS services must be synchronized, that is, there must be a downlink synchronization signal to complete the downlink frequency offset. Estimation and timing synchronization, but because the OFDM symbol requires the use of a long cyclic prefix (CP, Cyclic Prefix), the length of the special time slot DwPTS used to transmit the downlink synchronization signal in the frame structure provided by the prior art cannot meet the requirement of using a long CP for transmission. The downlink synchronization signal cannot meet the synchronization requirements of each dedicated carrier carrying MBMS services, so it cannot be applied to transmit MBMS services in the LTE system

Images