Avoiding formation of a call loop resulting from handling of a mobile terminated call in parallel with a location update in a wireless communication network

摘要

A call loop avoidance capability is provided for preventing formation of a call loop resulting from handling of a mobile terminated (MT) call in parallel with a location update for a mobile device (MD) in a wireless communication network. The call loop avoidance capability prevents formation of a call loop between an old mobility and call management entity (MCME) and a new MCME when delivery of an MT call to an MD is performed while the MD is in the process of moving from the old MCME to the new MCME using a location update procedure. An enhanced call routing procedure supports direct delivery of the MT call from the new MCME to the MD (rather than delivery of the MT call by the new MCME to the MD via the old MCME) in order to prevent formation of a call loop between the old MCME and the new MCME.

主权项

1. A method for preventing a call loop for a mobile terminated (MT) call to a mobile device (MD), the method comprising:
using a processor and a memory for:
receiving, at a first mobility and call management entity (MCME) from a second MCME, a routing information request message associated with delivery of the MT call to the MD, the routing information request message comprising an indication of a gateway MCME for the MD; anddetermining, based on the indication of the gateway MCME for the MD, whether a call loop is expected to form between the first MCME and the second MCME during delivery of the MT call to the MD while the MD is moving from the second MCME to the first MCME using a location update procedure.