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 Procedure for the setup of an emergency call made by an unidentified subscriber in a wireless local loop

Details
Inventors: Penttinen, Simo;
Assignee: Nokia Corporation (Espoo, FI)
Primary Examiner: Maung; Nay
Assistant Examiner: Vuong; Quochien B.
Attorney, Agent or Firm: Altera Law Group, LLC

The invention relates to a procedure for the setup of an emergency call made by an unidentified subscriber in a wireless local loop, in which subscriber's stations (MS) are connected via a radio link over a base transceiver station (BS) to an access node (AN) and from the access node to a local exchange (LE) over a standard V5 interface, in which the subscriber ports are identified by means of an L3 address, and in which procedure subscriber and emergency call identification is carried out during call setup. An emergency call to a predetermined emergency number attempted by a subscriber unidentified and/or undefined in the local exchange is detected, and a free L3 address is selected and the unidentified subscriber's emergency call is set up using the free L3 address over a V5 interface in accordance with the ordinary call setup procedure.

DETAILED DESCRIPTION The procedure of the invention is characterised by what is presented in claim 1.
According to the invention, an emergency call to a predetermined emergency number attempted by a subscriber unidentified and/or undefined in the local exchange is detected during an emergency call and subscriber identification procedure, and a free L3 address is selected and the unidentified subscriber's emergency call is set up using this free L3 address over a V5 interface in accordance with the ordinary call setup procedure.
In an embodiment of the procedure, the free L3 address is a normal L3 address of an existing subscriber.
In an embodiment of the procedure, the free L3 address is a predetermined value in the V5/L3 address range, and this value has been reserved for the setup of emergency calls, to be used for emergency calls made by unidentified subscribers.
In the following, the invention will be described in detail by the aid of examples of its embodiments by referring to the attached drawing, in which.


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