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Distributed wireless communication base station system, signal processing device, wireless device and execution method of distributed wireless communication base station system

A signal processing device and wireless communication technology, applied in wireless communication, data exchange through path configuration, transmission system, etc., can solve the problem of bandwidth occupation and achieve the effect of reducing bandwidth

Active Publication Date: 2018-05-29
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] Also in the downlink, the wireless signal is always converted into IQ data according to the fixed sampling frequency and the number of quantized bits, so for the RRU that does not belong to the wireless terminal, the signal is also transmitted from the BBU, so the BBU-RRU is occupied bandwidth between

Method used

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  • Distributed wireless communication base station system, signal processing device, wireless device and execution method of distributed wireless communication base station system
  • Distributed wireless communication base station system, signal processing device, wireless device and execution method of distributed wireless communication base station system
  • Distributed wireless communication base station system, signal processing device, wireless device and execution method of distributed wireless communication base station system

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Embodiment approach 1

[0199] The invention of this embodiment can reduce the installation / operating cost of the optical fiber transmission channel by using the PON system to connect one BBU and multiple RRUs, and can improve bandwidth utilization efficiency through the statistical multiple effect obtained by sharing the optical fiber transmission channel.

[0200] Specifically, the distributed wireless communication base station system of the present invention divides the function of the base station for transmitting and receiving wireless signals with wireless terminals into a signal processing device (BBU: Base Band Unit) and a plurality of wireless devices (RRU: RemoteRadio Unit), The distributed wireless communication base station system is characterized in that it includes: a PON (Passive Optical Network) system, which connects one of the BBUs and a plurality of the RRUs, and performs RoF (Radio over Communication) between the BBU and the RRUs through optical signals. Fiber) transmission; OLT (...

Embodiment approach 1-1

[0211] Picture 1-1 It is a figure explaining the distributed wireless communication base station system 301 of this embodiment.

[0212] The distributed wireless communication base station system 301 divides the function of the base station for transmitting and receiving wireless signals with the wireless terminal 101 into a BBU110 and a plurality of RRU120. The distributed wireless communication base station system 301 is characterized in that it includes: a PON system 130 connected to a BBU110 and a plurality of RRU120, between the BBU and the RRU using optical signals for RoF transmission; OLT function 140, located on the BBU110 side of the PON system 130, for the signal format processed by the BBU110 and the signal format that can be transmitted by the PON system 130 Perform mutual conversion, and control the sending time to avoid the collision of optical signals in the PON system 130; and the ONU function 150, located on the RRU120 side of the PON system 130, performs th...

Embodiment approach 1-2

[0219] Embodiment 1-2 is different from Embodiment 1-1 in that the present invention can be implemented using existing BBU / RRU / OLT / ONU. Figure 1-4It is a figure explaining the distributed wireless communication base station system 302 of this embodiment. The OLT function 140 of the distributed wireless communication base station system 302 is realized by the first adapter 210 and the OLT220. The above-mentioned first adapter 210 performs mutual conversion between the signal format processed by the BBU110 and the signal format that can be transmitted by the PON system 130. The above-mentioned OLT220 controls to avoid At the transmission moment when the optical signals in the PON system 130 collide, the first adapter 210 and the OLT 220 are sequentially connected from the BBU 110 side between the BBU 110 and the PON system 130, and the ONU function 150 is realized through the second adapter 230 and the ONU 240. The adapter 230 converts the signal format processed by the RRU 120...

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Abstract

The present invention provides a distributed wireless communication base station system, a signal processing device, a wireless device and an operation method of the distributed wireless communication base station system. Since the sampling frequency of the RRU is always fixed, it is possible to perform A / D conversion with a sampling frequency higher than necessary for the frequency bandwidth of the radio signal. The present invention has the function of changing the sampling frequency, and according to the wireless bandwidth allocation information, the sampling frequency is decreased or the signal between the BBU-RRU in the no-signal interval is reduced within the range where the foldback component does not cause signal quality degradation to the desired signal component when the sampling frequency is decreased. Transmission is stopped, thereby reducing the bandwidth required for digital RoF transmission between BBU-RRUs.

Description

technical field [0001] In the cellular system, in order to improve the degree of freedom of unit configuration, the function of the base station is divided into a signal processing unit (BBU: Base Band Unit baseband processing unit) and an RF unit (RRU: Remote Radio Unit). It becomes a physically separate constituent. At this time, wireless signals are transmitted between the BBU-RRU using RoF (Radio over Fiber) technology. RoF technology can be roughly divided into analog RoF technology and digital RoF technology, but in recent years, a lot of research has been done on digital RoF technology with good transmission quality, promoted by alliances such as CPRI (Common Public Radio Interface) and formulated usage methods (such as See Non-Patent Document 1). In addition, coaxial cables or optical fibers are used as the transmission medium between the BBU and RRU, especially the connection by optical fibers can greatly increase the transmission distance. [0002] In addition, on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W92/16H04B10/2575H04L12/44H04W28/10
CPCH04B10/25753H04L12/44H04W28/10H04W88/08H04W92/16H04B10/25754H04B10/25759
Inventor 柴田直刚吉田诚史桑野茂可児淳一寺田纯
Owner NIPPON TELEGRAPH & TELEPHONE CORP