Use of common public radio interface over asymmetric networks

Abstract

Communication between a Radio Equipment Control (REC) and a Radio Equipment (RE) in a wireless network uses a Common Public Radio Interface connection. When the Radio Equipment Control and the Radio Equipment are located remote from each other, and are connected by an asymmetric transport network, such as an Optical Transport Network, path delay data is transmitted in the Common Public Radio Interface data frames. This allows the CPRI end nodes to correct for path delay asymmetry using the path delay data.

Description

technical field [0001] The present invention relates to radio interface architectures, and in particular to radio access architectures using a common public radio interface. More specifically, the invention relates to the use of a common public radio interface over a transmission medium in which the downlink delay and uplink delay cannot be guaranteed to be equal. Background technique [0002] It is known that in a Radio Access Network (RAN), such as a Universal Mobile Telecommunications System (UMTS) RAN, a radio base station has two basic subsystems, namely Radio Equipment Control (REC) and Radio Equipment (RE). The Common Public Radio Interface (CPRI) defines specifications for the internal interface of a radio base station between the Radio Equipment Control (REC) and the Radio Equipment (RE). [0003] In some cases, a particular radio access network may require that the nodes of the network should synchronize within a specified time. In such cases, it will often be ne...

AI Technical Summary

Problems solved by technology

[0005] However, when the link uses an asymmetric connection, where the uplink delay is not necessarily equal to the downlink delay, the one-way delay cannot be estimated from the round-trip delay with the required accuracy

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