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A low-complexity multicast group decomposition method based on svc video stream

A low-complexity, multicast group technology, applied in broadcast service distribution, wireless communication, transmission systems, etc., can solve the problems of failing to consider the fairness of multicast group resources and high computational complexity, and achieve good service quality and balance Resource allocation and the effect of improving system fairness

Active Publication Date: 2022-03-15
BEIHANG UNIV
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Problems solved by technology

[0006] However, the existing multicast transmission algorithms using SVC video streams have high computational complexity and fail to consider the fairness of resources within the multicast group.

Method used

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  • A low-complexity multicast group decomposition method based on svc video stream
  • A low-complexity multicast group decomposition method based on svc video stream
  • A low-complexity multicast group decomposition method based on svc video stream

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Embodiment

[0129] The video stream data used in this embodiment comes from the Internet, and is multicast to each user via a ground base station. Since the channel quality of users in a multicast group is different, it is necessary to divide the multicast group into multiple subgroups. The process of multicast transmission resource allocation is to divide the time-frequency resources into multiple resource blocks (RBs), and dynamically adjust the modulation and coding scheme (MCS) according to the channel quality index (CQI). The larger the CQI value, the higher the MCS modulation order. high. Multicast video streams are sent in the cell, and K users in the cell form a multicast group. During multicast transmission, the CQI values ​​of different users are represented by m, 1<m<M; M represents the value of CQI maximum value.

[0130] Such as figure 1 As shown, the number of SVC video layers that can be received by different subgroups will also vary according to the data rate. In order t...

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Abstract

The invention discloses a low-complexity multicast group decomposition method based on SVC video streams, and relates to the field of multi-rate multicast in mobile communication networks. Firstly, all users in a certain cell are formed into a multicast group, and the CQI values ​​fed back by users are divided into multicast groups. The multicast group is divided into sub-components, and the sub-groups and variable sub-group sets are initialized; then, weights and resources are pre-allocated for each sub-component; in order to achieve the maximum system rate on the basis of ensuring the basic video data transmission of users Each subgroup demodulates the SVC video data with different qualities according to the actual receiving capacity to establish an optimization goal; at the same time, a low-complexity multicast resource allocation algorithm that meets user needs and system resource fairness is proposed, and the objective function is iteratively optimized and output Final result. The invention considers the limitation of the SVC video layer in the process of improving the low-complexity grouping (LCS) algorithm, and introduces a constant value vector to suppress unfair resource allocation; effectively improves system fairness, and balances resource allocation among users.

Description

technical field [0001] The invention relates to the multi-rate multicast field of a mobile communication network, in particular to a low-complexity multicast group decomposition method based on SVC video streams. Background technique [0002] Wireless multicast technology uses the broadcast characteristics of wireless channels to enable the base station to transmit the same data to multiple users at the same time, effectively improving the transmission efficiency of the base station, and the feature of wireless multicast efficient use of existing resources, especially suitable for bandwidth pressure multimedia data transmission. [0003] However, the traditional multicast method will bring about the problem of "bottleneck users", because users in the multicast group have different channel fading conditions. If data is transmitted at a higher rate, users with poor channel conditions will not be able to correctly demodulate the signal. Therefore, in order to ensure that all u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/08H04W24/02H04L65/611H04L65/80
CPCH04W4/08H04W24/02H04L65/80H04L65/611
Inventor 徐桢杨静璇代添雄张涛刘锋
Owner BEIHANG UNIV
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