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Multi-user scheduling method based on double-codebook limited feedback in 3D MU-MIMO FDD system

A 3DMU-MIMOFDD, 1.3DMU-MIMOFDD technology, applied in the field of multi-user scheduling mechanism, can solve problems such as resource waste, computing load, etc.

Active Publication Date: 2016-06-29
CERTUS NETWORK TECHNANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For 3DMIMO where the base station is equipped with a large number of antennas, it will bring huge resource waste and computing load

Method used

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  • Multi-user scheduling method based on double-codebook limited feedback in 3D MU-MIMO FDD system
  • Multi-user scheduling method based on double-codebook limited feedback in 3D MU-MIMO FDD system
  • Multi-user scheduling method based on double-codebook limited feedback in 3D MU-MIMO FDD system

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Experimental program
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Embodiment 1

[0077] Consider a 3DMIMO system scenario including a single cell and multiple users. The base station deploys UPA antennas, with 8 antennas in the horizontal and vertical directions. Other specific simulation parameters are shown in Table 1. Assume that the total number of users in the cell varies between 10, 20, ..., 80, and the signal-to-noise ratio (SNR) is set to 10dB. In addition to comparing the two schemes provided by the present invention, we also compared the 3DMIMO user pairing scheme based on the optimal companion cluster (BCC) proposed in the existing literature and the random scheduling scheme (assuming that the users that the random scheduling scheme can schedule are total users one-tenth of the number).

[0078] Table 1 User 3D distribution scene simulation parameters

[0079]

[0080] From Figure 5 It can be seen that as the total number of users increases, the average spectral efficiency obtained by the cell also increases. Moreover, the spectrum effici...

Embodiment 2

[0082] Still consider a 3DMIMO system scenario including a single cell and multiple users. Assuming that the total number of users in the cell is 30, the system performance under the signal-to-noise ratio (SNR) of 0dB, 5dB, ..., 30dB is considered respectively. From Figure 8 It can be seen that with the gradual increase of SNR, the average spectral efficiency of the cell will also increase. The reason is that the SNR increases and the channel quality per user becomes better, although Figure 9 It shows that the number of schedulable users does not mean that the SNR has changed much, but the average spectral efficiency of each user will increase when the channel quality becomes better, which will eventually bring about an improvement in system performance. Figure 9 When the total number of users in the cell is fixed, the number of users that can be selected will not change much as the SNR changes, because the user scheduling strategy of the present invention aims to select ...

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Abstract

The invention discloses a multi-user scheduling method based on double-codebook limited feedback in a 3D MU-MIMO FDD system. The method comprises following steps of step 1, synchronously storing the horizontal codebook set and vertical codebook set of the 3D MU-MIMO FDD system in a base station and user terminals; step 2, sending reference signal information to the users by the base station through a configured channel state information reference symbol port and a downlink broadcast channel; step 3, carrying out downlink channel estimation by the user terminals according to received reference signal information; calculating channel state information namely CSI feedback information needing to be fed back according to the obtained 3D channel information; moreover, feeding back the CSI feedback information to the base station through an uplink feedback channel; step 4, grouping the users by the base station according to the obtained CSI feedback information, thus obtaining multiple horizontal user groups and multiple vertical user groups; intersecting every two user groups, thus obtaining multiple alternative selectable scheduling user sets; and selecting out one group with the maximum user CQI sum as the finally scheduled users for downlink transmission.

Description

technical field [0001] The invention relates to a multi-user scheduling mechanism in a 3DMIMO limited feedback system in wireless communication, in particular to a multi-user scheduling method based on dual codebook limited feedback in a 3DMU-MIMOFDD system. Background technique [0002] In a 3DMIMO system, a 2D uniform area array antenna (URA) is configured at the base station. Compared with the horizontal uniform linear array (ULA) in the traditional MIMO system, it is different in both the number of antennas and the antenna structure. This can not only solve the problem of limited base station space and antenna size faced in massive MIMO systems, but also fully exploit the degree of freedom in the vertical direction. Combined with the use of the existing active antenna system (AAS), the 3DMIMO system can not only realize the adaptive adjustment of the weight of the antenna in the horizontal direction, but also change the weight of the antenna in the vertical direction to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B7/0417H04B7/0452
Inventor 张国梅李杰李国兵吕刚明
Owner CERTUS NETWORK TECHNANJING