Wireless communication device, network node, methods and computer programs for aiding finding of synchronisation signals

A method of a network node of a cellular communication system for mobility from a first radio access network, RAN, operating using a first radio access technology, RAT, to a second RAN operating using a second RAT, wherein the first RAT has synchronisation signals with a first frequency allocation and the second RAT has synchronisation signals with a second frequency allocation in relation to a network frequency for the second RAT, the method comprising:

• determining allocation information about the synchronisation signals of the second RAT;
• and
• transmitting a radio resource control, RRC, message including the allocation information about the synchronisation signals of the second RAT.

A nontransitory computer readable storage medium comprising a computer program comprising instructions which, when executed on a processor of a wireless communication device of a cellular communication system, causes the wireless communication device to perform a method for mobility from a first radio access network, RAN, operating using a first radio access technology, RAT, to a second RAN operating using a second RAT, wherein the first RAT has synchronisation signals with a first frequency allocation and the second RAT has synchronisation signals with a second frequency allocation in relation to a network frequency for the second RAT, the method comprising:

• receiving a radio resource control, RRC, message including allocation information about the synchronisation signals of the second RAT;
• and
• performing synchronisation signal detection based on the allocation information.

A nontransitory computer readable storage medium comprising a computer program comprising instructions which, when executed on a processor of a network node of a cellular communication system, causes the network node to perform a method for mobility from a first radio access network, RAN, operating using a first radio access technology, RAT, to a second RAN operating using a second RAT, wherein the first RAT has synchronisation signals with a first frequency allocation and the second RAT has synchronisation signals with a second frequency allocation in relation to a network frequency for the second RAT, the method comprising:

• determining allocation information about the synchronisation signals of the second RAT;
• and
• transmitting a radio resource control, RRC, message including the allocation information about the synchronisation signals of the second RAT.