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Mobile telephony and wireless networks

The Universal Mobile Telecommunication System (UMTS), the third-generation cellular telephony technology developed by the 3GPP, heavily relies on ASN.1 and PER for the exchange of control messages between the mobile device and the base station and between different types of nodes within the mobile operator's radio access network.
LTE, the fourth-generation cellular technology designed by the 3GPP as an evolution of UMTS, also uses ASN.1 for its control messages. So does LTE-Advanced, the successor of LTE.

IEEE 802.16m, also known as WiMAX Version 2, the successor of IEEE 802.16e (WiMAX), is another wireless communications standard that uses ASN.1 and PER for its control messages.
TAP3 (Transferred Account Procedure) is the file format used by mobile network operators to exchange billing information about roaming subscribers. A TAP3 file contains charges for the use of the service by each roaming subscriber as well as customer care information to be used in case the subscriber contacts the mobile operator. The TAP3 format is specified in ASN.1.