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Cascade connection networking method based on xWDM wavelength-division multiplex RF far-drawing unit

A remote radio unit and wavelength division multiplexing technology, which is applied in radio relay systems, active electrical relay systems, radio/inductive link selection arrangements, etc., can solve the problem of increased complexity of time delay estimation and RRU synchronization. problems, reference clock variation, etc., to achieve the effects of enhancing performance and reliability, simplifying delay estimation and compensation, and increasing the interface rate

Inactive Publication Date: 2009-01-21
SUPERXON (CHENGDU) TECH LTD
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AI Technical Summary

Problems solved by technology

[0007] (2) Since the reference clock of the RRU is recovered from the transmit clock on the BBU side and passed down step by step, the cascaded RRUs will cause the reference clock recovered from the line to deteriorate step by step, resulting in subsequent There may be problems with the synchronization of level RRUs;
[0008] (3) For a time division duplex (TDD) system, the BBU also performs delay compensation for the transmission of each RRU (or RRU for delay compensation) to ensure the synchronization of different RRU transmission signals. Multi-level cascading will lead to The complexity of delay estimation is increasing and the error is gradually expanding;
[0009] (4) Due to the time-division multiplexing of data of different RRUs and the limited line rate level, the line rate also limits the number of RRUs, especially for width and multi-antenna systems. The existing RRU cascading method can only support few RRU
[0010] Each of the above problems is a big problem for the remote radio system based on TDM

Method used

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  • Cascade connection networking method based on xWDM wavelength-division multiplex RF far-drawing unit
  • Cascade connection networking method based on xWDM wavelength-division multiplex RF far-drawing unit
  • Cascade connection networking method based on xWDM wavelength-division multiplex RF far-drawing unit

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Embodiment Construction

[0037] An example of URI application using four-wavelength CWDM is shown in the attached figure 1 . by figure 1 Take RRU1 as an example, the structure diagram after using URI on the RRU side is shown in image 3 . In order to facilitate the comparison between URI and TDM multiplexing methods, an example of interconnection between RRU and BBU based on TDM (CPRI or OBSAI) multiplexing is shown in Figure 4 . In the downlink direction, the BBU side sends the communication data with different RRUs on different optical wavelengths. Different optical wavelengths meet the wavelength series of CWDM. Optical signals of different wavelengths are multiplexed to one optical fiber through the optical multiplexing device MUX;

[0038] The RRU side takes out the signal of a specific wavelength supported by the RRU from the optical fiber through the optical add-drop multiplexing device OADM, while the optical signals of other wavelengths are directly transparently transmitted from the RRU...

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Abstract

The present invention discloses a cascade network building method based on the wavelength division multiplexing (xWDM) radio frequency remote unit, and mainly comprises the following steps: 1, the wavelength division multiplex (xWDM) is used in a radio frequency remote type BTS system for the cascade radio frequency remote unit RRU; 2, the wavelength division multiplex (xWDM) and the time division multiplex (TDM) are compounded and then used in the radio frequency remote type system, and different wavelengths are adopts to form the logical star connection between the BTS and different RRUs; 3, the wavelength division multiplex (xWDM) is used in the RRU of the cascade radio frequency remote type BTS system and in the base station system BTS; 4, the wavelength division multiplex (xWDM) is used in the cascade optical transmission system from the one-point main equipment to the multi-point auxiliary equipment. The network building method greatly saves the transmission resources of the system, enlarges the transmission capacity of the system, prevents the problem of gradual declination of the clocks which are restored and transmitted step by step in the TDM multiplexing mode, simplifies the problems in the estimation of time delay between the cascade systems, and is suitable for the base station system of multi-mode communication modes.

Description

technical field [0001] The invention relates to a networking method for cascading radio remote units RRU by using wavelength division multiplexing xWDM transmission equipment in a remote radio communication system. technical background [0002] With the rapid development of cellular mobile communication systems, the competition between different communication systems and operators is becoming more and more fierce. Operators are not only concerned about the cost of the equipment itself, but also the construction and operation costs of the base station system. The main problem of the traditional network construction method is that operators have to spend a lot of time and money on the rental of computer rooms, and a large number of ideal site computer rooms cannot be obtained because they are far away from residences, which also delays the speed of network construction. Especially for those new mobile operators, if they use this network construction method without sufficient c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/15H04Q7/30
Inventor 周庭铭邹渊余涛
Owner SUPERXON (CHENGDU) TECH LTD
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