Method and system for outer cell reselection of transmission mode multicast single frequency network

Abstract

The invention discloses a method and system for outer cell reselection of a transmission mode multicast single frequency network. The method comprises a first step of judging whether a cell is a transmission mode multicast single frequency network inner cell while judging whether to add the cell to a target set, entering a second step if the cell is not the transmission mode multicast single frequency network inner cell, and entering a third step if the cell is the transmission mode multicast single frequency network inner cell; the second step of starting the transmission mode multicast single frequency network outer cell reselection process; and the third step of starting the transmission mode multicast single frequency network inner cell reselection process. According to the method and system for outer cell reselection of the transmission mode multicast single frequency network, transmission mode multicast single frequency network reference signals are subject to diversity reception. Mobile users can accurately judge channel quality by measuring the quality conditions. The mobile users improve the resource utilization rate by delaying channel switching, the judging accuracy of a target cell is improved, and accordingly the ping-pong effect is reduced. The cell can be added to the single frequency network, multicast services are transmitted through multicast channels, radio resources are saved compared with unicast, and the continuity of the radio resources is also easier to achieve.

Description

Technical field [0001] The invention relates to the field of wireless communication, in particular to a method and system for reselecting an external cell of a transmission mode multicast multicast single frequency network. Background technique [0002] In the long-term evolution project LTE of the mobile communication system proposed by the third-generation partnership project 3GPP, the Multimedia Broadcast Multicast Service (MBMS) is defined in Release 6 as a technical standard for realizing multimedia broadcast and multicast. In the subsequent standard formulation, 3GPP introduced the Evolved Multimedia Broadcast Multicast Service (E-MBMS, Evolved Multimedia Broadcast Multicast Service) standard to further improve LTE by making improvements in logical architecture, business models, and transmission methods. Multicast broadcast service performance in the system. E-MBMS defines the Multicast Broadcast Single Frequency Network (MBSFN) transmission mode. Multicast Multicast Singl...

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Problems solved by technology

[0006] At the same time, the transmission of multicast services in the transmission mode multicast multicast single frequency network will have diversity gain from multiple cells, while the traditional cell selection considers the signal strength of the cell-specific reference signal, which is not enough to guarantee Judging the quality of the multicast channel, during cell reselection, channel switching may be performed early when the multicast channel quality can still guarantee the multicast service, thus wasting resources or generating unnecessary switching

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