Method performed by a first network node (101), e.g. a SGSN or an MME. The first network node (101) initiates sending (401) a first paging request to a second network node (102), e.g. a node of a Base Station Subsystem (BSS), which indicates that a wireless device (141) served by the second network node (102) is to initiate cell reselection prior to sending a first response, based on the first paging request, wherein the wireless device (141) is to be paged for a positioning procedure, e.g. a timing advance (TA) multilateration.