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Self-adaptive scheduling method of multimedia broadcast multicast service (MBMS) system

A scheduling method and adaptive technology, applied in electrical components, wireless communication, broadcast service distribution, etc., can solve the problem of users not receiving services, and achieve the effect of improving system throughput and achieving multicast gain.

Inactive Publication Date: 2013-01-30
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0016] MAX algorithm: When selecting the data rate of the multicast group, select the data rate corresponding to the user that maximizes the throughput of the multicast group. This selection improves the system throughput, but this will cause some channel conditions to be lower than the selected group data Rate users cannot receive service
Therefore, this algorithm sacrifices user satisfaction within the group to obtain higher system throughput.

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  • Self-adaptive scheduling method of multimedia broadcast multicast service (MBMS) system
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  • Self-adaptive scheduling method of multimedia broadcast multicast service (MBMS) system

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Embodiment Construction

[0035] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0036] The idea of ​​the present invention is to comprehensively consider the system throughput and the fairness of users in the group, by setting the threshold of the average packet loss rate, and combining the MAX and MIN algorithms, an adaptive scheduling (Adaptive intra-group and proportional fairness inter -group, referred to as APF) algorithm.

[0037] For the convenience of public understanding, the following briefly introduces the existing MAX algorithm and MIN algorithm.

[0038] First, some variables involved in the algorithm are defined as follows:

[0039] no g : number of users in group g;

[0040] V rig (t): the data rate of user i belonging to group g on the tth transmission time interval (TTI, Transmission Time Interval) on resource block r;

[0041] V rg (t): the data rate selected by group g at the tth TTI moment on resource block ...

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Abstract

The invention discloses a self-adaptive scheduling method of a multimedia broadcast multicast service (MBMS) system. The invention adopts the single-rate-transmission multicast mode. A base station first sets data rate of each multicast group at each TTI moment according to the method. The method includes judging whether a user with average packet loss rate at the last TTI moment larger than one preset threshold exists in the multicast group or not, utilizing data rate of a user with smallest data rate in the group as the data rate of the multicast group on yes judgment, utilizing the data rate of the user enabling simultaneous data rate of the group to be largest as the data rate of the multicast group on no judgment and utilizing the proportional fair algorithm to conduct resource scheduling between the multicast group. The average packet loss rate at the last TTI moment of the user refers to the ratio of the number of accumulative packets not correctly received by the user and the sum of accumulative data packets transmitted to the user by the base station in the time section from the initial TTI to the last TTI. The method improves system throughput capacity and achieves balance of multi-user diversity and multicast gain on the base that user satisfaction degree is guaranteed.

Description

technical field [0001] The invention relates to a scheduling method of an MBMS (Multimedia Broadcast Multicast Service, multimedia broadcast multicast service) system, belonging to the technical field of wireless communication. Background technique [0002] In recent years, the explosive growth of data services and the various quality of service requirements of different users have made mobile wireless communication systems develop by leaps and bounds. And with the expansion of more military applications and commercial services, this need will become more urgent in the future. In order to meet the above requirements, major standard organizations have successively proposed their respective future technology research and development directions. One of the effective solutions is to transmit some applications to a selected group of users, that is, to transmit some applications through multicast. For example, traffic status reports, local news, weather forecasts, updates of geog...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04W72/12
Inventor 张艳凤付茂豹刘圣洁王斌
Owner NANJING UNIV OF POSTS & TELECOMM
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