User selection method for simultaneously meeting unicast and multicast services
A multicast service and unicast technology, applied in multi-frequency code system, network traffic/resource management, electrical components, etc., can solve the problem that the resources of good users are not fully utilized, and achieve the maximum unicast data rate , the effect of low complexity
Inactive Publication Date: 2014-06-04
XI AN JIAOTONG UNIV
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[0004] The purpose of the present invention is to overcome the problem that the existing multicast system is limited to users with the worst links, and the resources of good users are not fully utilized; to propose a user selection method that satisfies both unicast and multicast services , this method maximizes the unicast rate while ensuring that the multicast rate does not decrease, effectively improving the utilization of the spectrum, thereby improving the performance of the entire system
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[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation examples.
[0034] The core idea of the present invention is that among the carriers assigned to multicast, since multicast is limited to users with the worst links, the resources of users with good links are not fully utilized. Under the premise, multicast and unicast are superimposed and transmitted through superposition coding. In order to achieve the purpose of not affecting the multicast rate, block diagonalization (BD, Block Diagonalization) is firstly used to solve the problem that the unicast data flow will not affect the performance of the original multicast worst user, and then the power control is used to ensure that it will not Users with worse performance than the worst multicast users are generated, and finally the unicast data rate is maximized without reducing the multicast data rate through the user selection strate...
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The invention provides a user selection method for simultaneously meeting unicast and multicast services, which comprises the following steps of: (1) overlapping unicast on the original a carrier wave distributed to multicast, and establishing a user selection model; (2) ensuring that the speed of the multicast service on the carrier wave can not be reduced through block diagonalization (BD) and power control; and (3) selecting a unicast user set with largest unicast and speed. In the method provided by the invention, during multicast service transmission, the demand of a user needing the unicast service while needing the multicast service is considered simultaneously. In an OFDM (Orthogonal Frequency Division Multiplexing) system, unicast is overlapped on the subcarrier wave distributed to the multicast through BD on the premise of ensuring that the receiving property of the poorest multicast user can not be influenced. Speed maximization and no generation of new poorest link user can be ensured by selecting the optimal unicast user set and the corresponding power control scheme.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a user selection method satisfying both unicast and multicast services. Background technique [0002] With the development of wireless networks, users have higher and higher requirements for service quality, and limited spectrum resources cannot meet the requirements of users more and more. Therefore, a multicast technology for transmitting the same data to multiple users is proposed, which can make good use of frequency spectrum and improve resource utilization efficiency. However, due to the different channel links of multiple users in the multicast service, in order to meet the service needs of all users, the data rate of multicast is often limited to the user with the worst link, so the resources of users with better links are not sufficient. use. At the same time, when multiple users receive multicast services such as video and TV programs, they also have co...
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IPC IPC(8): H04W28/02H04L27/26
Inventor 任品毅贾毅杜清河陈志刚王熠晨吴广恩
Owner XI AN JIAOTONG UNIV