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Frequency division duplex (FDD) massive MIMO backhaul for repeater small cells

A large-scale, small-cell technology, applied in the directions of pilot signal allocation, multiple use of transmission paths, and sub-channel allocation of transmission paths, which can solve problems such as limiting deployment flexibility.

Active Publication Date: 2017-08-29
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mmWave links are typically limited to line-of-sight propagation and require relatively tight antenna alignment, which in turn limits deployment flexibility

Method used

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  • Frequency division duplex (FDD) massive MIMO backhaul for repeater small cells
  • Frequency division duplex (FDD) massive MIMO backhaul for repeater small cells
  • Frequency division duplex (FDD) massive MIMO backhaul for repeater small cells

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Embodiment Construction

[0020] Various example embodiments will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown.

[0021] Detailed illustrative embodiments are disclosed herein. However, specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments. This invention may, however, be embodied in many alternative forms and should not be construed as limited to only the embodiments set forth herein.

[0022] Therefore, although the example embodiments are capable of various modifications and alternative forms, the embodiments are shown in the drawings by way of example and will be described herein in detail. It should be understood, however, that there is no intent to limit example embodiments to the particular forms disclosed. On the contrary, example embodiments are to cover all modifications, equivalents, and alternatives falling within the scope of this disclosu...

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Abstract

In a method for transmitting data through a Massive MIMO backhaul system, a central node of the MIMO backhaul system transmits, to a small cell repeater terminal on the downlink, a downlink pilot signal carrying a set of pilot sequences that are mutually orthogonal in the frequency domain. Each pilot sequence in the set of pilot sequences corresponds to an antenna of an antenna array at the central node. The central node receives an uplink pilot signal carrying the set of pilot sequences transmitted by the small cell repeater terminal on the uplink, where the received uplink pilot signal is a frequency converted retransmission of the downlink pilot signal. The central node estimates at least one of an uplink channel and a downlink channel between the central node and the small cell repeater terminal based on the set of pilot sequences and the received uplink pilot signal.

Description

Background technique [0001] Small cells are considered by many to be a promising component of future fifth-generation (5G) wireless systems. However, the potential of small cells can only be realized if installation costs are manageable. [0002] Two basic requirements for small cell installations are power and backhaul, which are often expensive when provided by wired connections. By charging the battery using power from, for example, small wind turbines and / or solar panels, wired connections for electricity can be eliminated while minimizing internal power consumption. Wired backhaul connections can be eliminated by using wireless backhaul. [0003] A relay cell has been proposed to reduce internal power consumption at a small cell. On the downlink, the relay cell receives a complex-valued analog baseband signal on a carrier frequency from the backhaul link and retransmits the baseband signal at an access carrier frequency accommodating one or more users connected to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/155H04L5/00H04L25/02H04B7/0413
CPCH04B7/0413H04B7/155H04B7/15528H04L5/0048H04L25/0242H04L25/0204H04L25/0228
Inventor T·马兹塔O·布卢默P·鲁里科斯基S·迈尔A·帕施特T·克莱因
Owner ALCATEL LUCENT SAS