| CPC G01S 19/256 (2013.01) [H04W 56/001 (2013.01)] | 20 Claims |

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1. An apparatus comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus at least to perform:
receiving, from a serving access node of a terminal device, a first downlink radio resource control message comprising reference time information for a clock provided by the serving access node and traceability information for enabling traceability of the clock to a reference time standard, wherein the traceability information comprises at least information on a clock class indicative of a current status of the clock provided by the serving access node.
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