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Uplink power control for MU-MIMO

A power control, MU-SINR technology, applied in power management, radio transmission system, electrical components, etc., can solve the problems of increasing total transmission power, increasing interference in the cell, reducing potential gain, etc., to improve system gain and improve cell Throughput, the effect of improving the quality of service

Inactive Publication Date: 2014-08-20
ERICSSON (CHINA) COMMUNICATION COMPANY LTD
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AI Technical Summary

Problems solved by technology

At the same time, an increase in the total transmit power on the scheduling blocks used for MU-MIMO transmission will increase the intra-cell interference, thereby reducing the potential gain

Method used

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  • Uplink power control for MU-MIMO

Examples

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Embodiment Construction

[0027] For the purpose of elucidating the invention, reference is made to figure 1 The concept of MU-MIMO is described.

[0028] exist figure 1 In , a communication system 100 capable of supporting MU-MIMO transmission is illustrated. The communication system 100 may be, for example, an LTE network including a radio base station 110 , such as an eNode-B, which participates in wireless communication of the first UE 111 and the second UE 112 . On the first radio channel 113, wireless communication between the eNode-B 110 and the first UE 111 is affected. Correspondingly, on the second radio channel 113, wireless communication between the eNode-B 110 and the second UE 112 is affected.

[0029] Wireless communication between eNode-B 110 and first 111 and second UE 112 may be affected in downlink, i.e. from eNode-B 110 to UEs 111 and 112, and in uplink, i.e., UE 111 and 112 to eNode-B 110 are affected. In this respect, the term "radio channel" is understood to include a number...

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Abstract

A method (310) of power control for multi-user multi-input multi-output (MU-MIMO) transmissions between a pair of mobile terminals and a radio base station is provided. The method comprises determining (312) signal-to- interference-noise ratios (SINRs) for the radio channels between the mobile terminals and the radio base station, determining (312) a channel orthogonality between the radio channels, and jointly determining (315), based on the SINRs and the channel orthogonality, power adjustment values for the mobile terminals. The present invention makes use of an understanding that the system gain resulting from MU-MIMO transmissions may be improved by optimizing the transmission power of the co-scheduled mobile terminals. For instance, the power adjustment values may be determined so as to attain certain SINR targets. Alternatively, the power adjustment values may be determined so as to maximize the throughput while maintaining a power budget constraint. Further, a radio base station for MU-MIMO transmissions is provided.

Description

technical field [0001] The present invention relates generally to Long Term Evolution (LTE) wireless communications, and more specifically to uplink power control in Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmissions. Background technique [0002] In Release 8 of 3GPP, a user equipment (UE) supports multiple receive antennas, but only one transmit antenna. Therefore, Single User MIMO (SU-MIMO) can only be supported in downlink, while MU-MIMO can be supported in uplink. [0003] MU-MIMO allows to use common time-frequency resources, ie to schedule uplink transmissions of blocks from multiple UEs to a radio base station, eg eNode-B. To separate these transmissions, MU-MIMO relies on the availability of multiple receive antennas at the radio base station, and on a significantly different spatial radio channel between the UE and the radio base station. [0004] An important benefit of uplink MU-MIMO is a similar gain in system throughput to that achievable in SU...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/00
CPCH04W24/08H04B7/0452H04W52/42H04W52/146H04W52/241H04W52/267H04W52/346
Inventor 范锐卢前溪赵振山
Owner ERICSSON (CHINA) COMMUNICATION COMPANY LTD
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