Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) transmits a first request assistance data message to a location server, the first request assistance data message comprising a request for first positioning assistance, receives a provide assistance data message from the location server, the provide assistance data message indicating that the location server is not currently able to provide the first positioning assistance, and transmits a second request assistance data message to the location server after expiration of a reattempt time from reception of the provide assistance data message, the second request assistance data message indicating a request for second positioning assistance, wherein the first positioning assistance is not received by the UE prior to the reattempt time.