Method and network node for communication between a first network node and a second network node via twisted pair

Abstract

A first network node (11) of a cellular system for communicating with a second network node (21) via a twisted pair (23). The first network node comprises a receiver (123) for receiving an intermediate frequency signal via a twisted pair from a second network node, the intermediate frequency signal having been converted by the second network node from a high frequency signal having a higher frequency than the intermediate frequency a higher frequency of the frequency of the signal; and a down converter (121) for converting the intermediate frequency signal into a low frequency signal having a lower frequency than the frequency of the intermediate frequency signal. The first network node also includes an upconverter (122) for converting a received low frequency signal into an intermediate frequency signal having a frequency higher than that of the low frequency signal; and a transmitter (124) for The intermediate-frequency signal is transmitted via a twisted pair to a second network node for subsequent conversion at the second network node into a high-frequency signal having a higher frequency than the frequency of the intermediate-frequency signal. The invention also relates to corresponding methods that consider downlink signals and uplink signals separately.

Description

technical field [0001] The present disclosure generally relates to methods and network nodes for communicating between a first network node and a second network node over twisted pair wires. Background technique [0002] In cellular systems, in order to further increase mobile network capacity, heterogeneous networks have been adopted. An example of a typical heterogeneous network is in figure 1 shown in . figure 1 The heterogeneous network includes a macro base station BS11 covering a geographical area of ​​a macro cell 12, and two pico BSs 21, 31 covering a geographical area of ​​a pico cell 22, 32, respectively. As seen in the figure, the coverage area of ​​a macro cell is much larger than that of a pico cell. Therefore, pico BSs communicate using lower power than macro BSs. Furthermore, the pico BSs are backhauled, ie they are connected to the mobile network via the macro BSs via links 23, 33, respectively. The link may be a physical link, microwave link, radio link...

AI Technical Summary

Problems solved by technology

Furthermore, oversampling has to be performed even if there is no data to transmit

Due to the high capacity requirement as well as the low latency requirement, CPRI is unlikely or at least disadvantageous to be used to transmit signals over twisted pair between RRU based pico BS and macro BS

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