Cell search and connection procedures in a cellular communication device

A method for a cellular communication device capable of communicating via a first radio-access technology (RAT) in a first frequency band, and via a second RAT in a second frequency band, which is in a higher frequency region than the first frequency band, of connecting to a cell of the second RAT, comprising:

• performing the cell-search method according to any preceding claim;
• and
• if said second cell is detected:
• registering with the second cell.

A cellular communication device capable of communicating via a first radio-access technology (RAT) in a first frequency band, and via a second RAT in a second frequency band, which is in a higher frequency region than the first frequency band, comprising:

• a control unit adapted to:
• perform a first cell search in the first frequency band in order to detect a first cell of the first RAT;
• and
• if such a first cell is detected:
• synchronize to the first cell, without registering to the first cell;
• determine a reference frequency error estimate between a local reference frequency of the cellular communication device and a reference frequency of the first cell;
• and thereafter
• perform a second cell search, based on the reference frequency error estimate, in the second frequency band to detect a second cell of the second RAT.

A nontransitory computer readable storage medium having stored thereon a computer program product comprising computer program code for executing a cell-search method when said computer program code is executed by a programmable control unit of the cellular communication device, wherein the cell search method is for a cellular communication device capable of communicating via a first radio-access technology (RAT) in a first frequency band, and via a second RAT in a second frequency band, which is in a higher frequency region than the first frequency band, comprising:

• performing a first cell search in the first frequency band in order to detect a first cell of the first RAT;
• and
• if such a first cell is detected:
• synchronizing to the first cell, without registering to the first cell;
• determining a reference frequency error estimate between a local reference frequency of the cellular communication device and reference frequency of the first cell;
• and thereafter
• performing a second cell search, based on the reference frequency error estimate, in the second frequency band to detect a second cell of the second RAT.