Method for transmitting multiple system radio service IQ data by general public radio interface

Abstract

The present invention discloses universal public wireless interface transmission multi-system wireless service IQ data method to make CPRI interface capable of transmitting variety different system wireless service data. It contains according to CPRI basic frame cycle and system cyclic common multiple relation, setting M individual periodic IQ data in NCPRI basic frame to transmit, to make transaction data rate and CPRI interface rate matching convenient for realizing frame synchronization; uniformly filling M individual periodic IQ data in N CPRI basic frame IQ container, designing different kinds of filling mode to make IQ data reaching rate uniform through container mapping; through dividing same CPRI interface corresponding different RE and different system IQ data in CPRI basic frame IQ container, realizing variety different system IQ data in CPRI interface simultaneous transmission.

Description

technical field [0001] The invention relates to a technology for transmitting wireless service data by a common public radio interface, in particular to a method for transmitting IQ data of user planes of multiple wireless services of different standards on the common public radio interface. Background technique [0002] The Common Public Radio Interface (CPRI for short) is a specification about the internal key interface of a mobile communication wireless base station publicly published by a number of industry cooperation companies. The CPRI specification is a public specification on this key interface in the industry, providing a set of common standards for key internal interfaces of base stations. The CPRI is responsible for defining the key internal interface of the wireless base station between a radio equipment controller (Radio Equipment Controller, "REC" for short) and a radio equipment (Radio Equipment, "RE" for short). The goal of the standard is to create an open...

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Problems solved by technology

[0019] In practical application, the above scheme has the following problems: If the CPRI standard is extended to support other systems, and the line rate and frame structure of CPRI must be maintained unchanged, the mapping method of IQ data will not be like that of WCDMA data. mapping so easy

Since the system rate and the CPRI basic frame rate are not a simple multiple, the IQ data mapping of different systems will be more complicated than the mapping of WCDMA on the CPRI interface

However, the existing CPRI V2.0 wireless data transmission architecture cannot realize the transmission and frame synchronization of IQ data of other systems, especially the simultaneous transmission of wireless IQ data of various frame systems

In short, due to the simple multiple relationship between the CPRI basic frame rate and the WCDMA rate, CPRI can use the existing transmission mechanism to transmit WCDMA IQ data, but cannot be extended to other systems or realize simultaneous transmission of multiple systems

[0020] The main reason for this situation is that the existing CPRI V2.0 is mainly designed for the WCDMA R6 standard, and its general frame length and control word structure cannot be applied to IQ data of other systems, especially the mismatch of system rates will bring Issues such as frame synchronization, IQ container mapping, etc.

In order to improve CPRI and apply it to different standards, two problems need to be solved: one is the mapping method of IQ data of different standards in the CPRIIQ container; the other is the synchronization relationship acquisition problem of business frames of different standards

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