Method and a radio base station in a telecommunications system
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsJacob Österling, Vimar Björk, Alireza Nejatian
Life of this patent
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Abstract
The present invention relates to radio base stations including a standardized interface CPRI between a Radio Equipment (RE) and a Radio Equipment Controller (REC). The present invention also relates to a method. The problem addressed is how to convey calibration information from the RE to the REC, when the capacity is occupied by radio IQ samples. The solution is to suppress the IQ samples to get capacity for the calibration information. Various embodiments of the invention focus on reducing the negative impact the suppression of IQ data may have on detecting the signals received.
Claims35
A method suitable for use in a radio base station, said radio base station comprising a radio equipment controller and a radio equipment that are connected via a first link interface, the method comprising the steps of:
- transmitting a stream of frames from the radio equipment to the radio equipment controller over said first link interface, wherein the frames include samples of a received radio signal, the method comprising the further steps of:
- including calibration information in a subset of said frames;
- suppressing radio signal samples to provide capacity in the subset of frames for carrying said calibration information.
A radio base station comprising:
- a radio equipment equipped with at least two interfaces for connecting to at least two antennas;
- a radio equipment controller connected to the radio equipment via a first link interface;
- a calibration radio equipment connected to the radio equipment via a second link interface, and further connected to the at least two interfaces used for connecting the at least two antennas, wherein,
- the radio equipment is arranged to sample a received radio signal, convert it to a base band signal, and transmit the base band signal samples in a stream of frames over the first link interface;
- and wherein,
- the radio equipment is arranged to include calibration information in a subset of said frames and to suppress signal samples in order to provide capacity in the subset of frames for carrying the calibration information.
A radio base station comprising:
- a unit comprising a radio equipment equipped with at least two interfaces for connecting to at least two antennas;
- a radio equipment controller connected to the radio equipment of said unit via a link interface;
- said unit further comprising a calibration coupling unit arranged to be connected to the at least two interfaces;
- the calibration coupling unit is further arranged to sample a transmitted radio signal and to transmit radio signal samples to the radio equipment;
- wherein the radio equipment is arranged to select between the radio signal samples received from the calibration coupling unit and at least one radio signal received from any of the antennas;
- the radio equipment is further arranged to convert the radio signal samples to a baseband signal;
- to transmit the samples in a stream of frames to the radio equipment controller;
- to include calibration information in a subset of the frames and suppress signal samples in order to provide capacity in the subset of frames for carrying the calibration information.
Dependencies are inferred from the claim text.