Selection method of two cooperative multicast modes of d2d and fixed relay in cellular system
A collaborative multicast, cellular system technology, applied in network traffic/resource management, electrical components, wireless communication, etc., can solve problems such as limited coverage, and achieve the effect of easy promotion, simple implementation, and good user experience
Active Publication Date: 2017-04-12
BEIJING UNIV OF POSTS & TELECOMM
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[0009] Mode 2 uses mobile terminals as relays and forwards them through D2D direct mode, so spectrum resources of cellular users can be reused, but its coverage is limited
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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] see figure 1, to introduce the application scenarios of the two mode selection methods of the mobile relay, that is, the D2D coordinated multicast and the fixed relay coordinated multicast method of the present invention: a base station, a fixed relay, and multiple mobile relays located in a cell centered on the base station Cellular wireless cellular network composed of terminals. When the base station executes the multicast service, in a certain period of time, some served mobile terminals fail to receive data because they are in the deep fading of the wireless channel. At this time, you can choose to use fixed relay cooperation or mobile terminal cooperation to successfully receive data to perform second-hop transmission, that is, one-ho...
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The invention relates to a method for making a choice between a D2D cooperating multicast mode and a fixed relay cooperating multicast mode in a cellular system. Based on the fact that the sending speed is limited by the poorest channel quality of users in multicast transmission and based on the rule that the users with the poorest channel quality are usually distributed on the edge of a community, transmission of one jump is divided into transmission of two jumps with good channel quality so that the higher data transmission speed and the larger throughput capacity can be achieved. The method comprises the steps that the utility values of the fixed relay cooperating multicast mode and the D2D cooperating multicast mode at the second jump are compared according to the actual conditions, so that the optimal transmission policy is selected, and the overall operation utility value of the cellular system is increased. According to the method, the advantages of the two cooperating relay multicast modes are effectively combined, the relay mode is reasonably selected, the transmission speed of a multicast service and the coverage rate of the users at the edge are improved, the overall utility of the cellular system is optimized, and better user experience can be obtained; operation steps are simple, computation complexity is low, the technology is easy to achieve, and popularization and application prospects are good.
Description
technical field [0001] The present invention relates to a mode selection method for maximizing multicast utility, specifically, two modes of terminal direct D2D (Device-to-Device) cooperative multicast and fixed relay cooperative multicast in a cellular system Method of choosing. It belongs to the technical field of wireless communication transmission. Background technique [0002] With the increasing demand for broadband multimedia services such as mobile TV and video / teleconferencing, the performance parameters of cellular system capacity, coverage and service flexibility have become important issues that need to be solved urgently in the next generation of wireless networks. Because the cellular communication system is limited by the base station-centered cell coverage, the advanced international mobile communication system IMT-Advanced (International Mobile Telecommunications-Advanced) is a new mobile system with capabilities exceeding IMT-2000, which can provide a wide...
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IPC IPC(8): H04W76/02H04W28/08
Inventor 王晓湘杜明君王冬宇王玉龙魏鹏
Owner BEIJING UNIV OF POSTS & TELECOMM