Apparatus and methods for transmission of emergency call data over wireless networks

摘要

Methods and apparatus for providing useful data in association with a high-priority call such as an emergency call. In one embodiment, the data comprises a data (e.g., an MSD or FSD) embedded within one or more real-time protocol packets such as RTP Control Protocol (RTCP) packets, that are interspersed within the voice or user data stream (carried in e.g., RTP packets) of an emergency call. Apparatus and methods are described for transmitting the data portion reliably from the initiating terminal (e.g., an in-vehicle system) to a Public Safety Answering Point (PSAP), by using the same transport connection as the user data.

主权项

1. A method of providing an emergency call within a network configured for substantially real-time packet-switched operation, the emergency call comprising a composite stream having a first stream and one or more second streams, the method comprising:
providing a digital representation of voice data using encoded voice packets within the first stream in a substantially continuous manner; providing data packets within the one or more second streams; forming the composite stream by interspersing the data packets of the one or more second streams with the first stream without modifying the digital representation of the voice data; establishing a session, wherein the session is additionally adapted to route the composite stream; and transmitting the composite stream via the session without modifying the digital representation of the voice data.