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Low-feedback multi-user scheduling method in cooperative multicast MIMO transmission

A multi-user scheduling and user scheduling technology, which is applied in transmission path sub-channel allocation, diversity/multi-antenna system, space transmit diversity, etc., can solve the problem of reducing the uplink feedback overhead

Inactive Publication Date: 2010-01-06
BEIHANG UNIV
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Problems solved by technology

Although ZFBF requires the scheduled users to feedback accurate CSIT, since the number of scheduled users only accounts for a small proportion of all users, the uplink feedback overhead is effectively reduced

Method used

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  • Low-feedback multi-user scheduling method in cooperative multicast MIMO transmission
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  • Low-feedback multi-user scheduling method in cooperative multicast MIMO transmission

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Embodiment Construction

[0098] The present invention proposes a low-feedback user scheduling method in coordinated multi-point transmission. Its basic idea is to consider the asymmetric characteristics of the CoMP system channel in the scenario where the cooperative base station adopts ZF-BF to realize downlink cooperative multi-user MIMO transmission, that is, The average channel energy from different cooperative base stations to the same user is different. Based on the theoretical analysis of the orthogonal projection modulus and angle upper bound of the space formed by the channel vector of each candidate user to the channel vector of the selected user, we propose two A scheduling scheme based on statistical modulus and based on all channels of the cell and channel modulus of other cooperative cells.

[0099] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accomp...

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Abstract

The invention relates to a low-feedback multi-user scheduling method in cooperative multicast MIMO transmission. The method comprises the following four schemes: (1) NUS, (2) Large Scale, (3) Local-NUS and (4) Local-Large Scale; and the four schemes are respectively based on different channel feedback information and have a unified executive process. The method is a scheduling method for selecting a plurality of service users in the spatial domain, and ensures the fairness among different users by combining an opportunistic round-robin scheduling method on a time domain; the scheduling process is as follows: 1. initialization, the user with best channel condition is selected as a first user according to the feedback information; 2. a scheduling user set is iteratively selected from the rest users based on the selected user until the given stopping criterion is met; and 3. the selected user is eliminated based on the opportunistic round-robin scheduling method, and the step 1 and the step 2 are repeatedly carried out. Compared with the cooperative scheduling method based on the complete channel information, the method has no high performance loss but remarkably reduces the feedbackquantity of the system; and compared with the non-cooperative system, the invention can greatly improve the system performance.

Description

(1) Technical field [0001] The invention relates to a user scheduling technology in a mobile communication system, in particular to a low-feedback user scheduling method in coordinated multi-point multiple-input multiple-output (MIMO) transmission, and belongs to the technical field of mobile communication. (2) Background technology [0002] In future cellular networks, full-frequency multiplexing is usually adopted to obtain high spectrum efficiency, and the resulting inter-cell interference will become one of the main bottlenecks to further improve system performance. In addition to various interference suppression techniques, a recent design idea of ​​Coordinated Multipoint Transmission (CoMP) has attracted extensive attention from industry and academia. Multi-base station coherent transmission is a typical cooperative multi-point transmission scheme. By jointly designing the transmission signals between multiple base stations, it can convert inter-cell interference signa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/04H04W74/06
CPCH04L5/0032H04L5/0035H04W72/1205H04W72/12
Inventor 韩圣千苏笛杨晨阳
Owner BEIHANG UNIV
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