Intelligent auxiliary transmission method in multicast broadcast service

Abstract

The invention relates to an intelligent auxiliary transmission method which comprises the following steps that: an MCBCS (Multicast Broadcast Service) server transmits MBS (Mutual Broadcasting System) data to a base station in an MBS region; the base station transmits the MBS data to a user; the user replies NACK (Negative Acknowledgement) to the base station if incapable of receiving the MBS data correctly; the base station transmits an intelligent auxiliary transmission remind to the MCBCS server; the MCBCS server transmits an intelligent auxiliary transmission request to partial adjacent base stations of the base station; the adjacent base stations respond intelligent auxiliary transmission responses after receiving the intelligent auxiliary transmission request; the MCBCS server transmits the MBS data to the adjacent base stations; and the adjacent base stations transmit the MBS data to the user. In the invention, the base station positioned at the boundary of the MBS region detects negative feedback information from the user, the base station reports to the MCBCS server if the negative frequency exceeds to certain threshold value, the MCBSC server invites base stations closes to the base station and outside the MBS region to join the multicast broadcast transmission, and the macro grading effect can be also achieved at the boundary of the MBS region, therefore, the spectrum efficiency at the boundary of the MBS region is improved.

Description

technical field [0001] The invention relates to a cellular system including a relay, in particular to an intelligent auxiliary transmission method in a multicast broadcast service. Background technique [0002] In the existing 802.16 system, the multicast broadcast service (MBS) is transmitted in the multicast broadcast area. A multicast / broadcast area includes one or more base stations, and these base stations use the same modulation and coding method when transmitting MBS, and transmit the same content on the same frequency at the same time. In the middle part of the MBS area, the same signals received by the user from all adjacent base stations are superimposed, resulting in a strong signal-to-interference-noise ratio. At the edge of the MBS area, users not only receive multicast broadcast signals from base stations in the MBS area, but also receive other signals from base stations in non-MBS areas, so the signal-to-interference-noise ratio is relatively low. [0003] T...

AI Technical Summary

Problems solved by technology

However, in 802.16m, users in idle mode can cross cell boundaries without notifying the base station, so this method cannot be used to solve the MBS area boundary problem in 802.16m

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