Positioning of gprs mobiles using toa methodology
OwnerShahrokh Amirijoo, Bagher R. Zadeh +2inventors
InventorsSHAHROKH AMIRIJOO, BAGHER R. ZADEH, BENGT YNGVE PERSSON, TORBJORN OLSSON
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Abstract
A method of positioning a GPRS mobile in a GSM network. Methodology is provided for both Class A, Class B and Class C GPRS mobiles such that the GPRS mobile can be positioned using conventional time of arrival (TOA) methodology. For Class A and Class B mobiles, a new information element in the Paging Message is provided to indicate positioning as the reason for paging. For Class C mobiles, both a new and a modified procedure is provided to facilitate positioning of a GPRS mobile.
Claims25
A method of locating a Class C GPRS mobile in a GSM wireless communications network, comprising the steps of:
- a) a serving GPRS node sending a positioning command to the GPRS mobile instructing the GPRS mobile to send a predetermined number of access bursts on an assigned uplink radio block of a PDCH channel;
- and
- b) the GPRS mobile responding to the positioning command by sending the predetermined number of access bursts on the assigned uplink radio block of the PDCH channel.
A method of locating a Class C GPRS mobile in a GSM wireless communications network, comprising the steps of:
- a) a serving GPRS node sending a predetermined number of polling messages to a GPRS mobile on a TBF;
- b) the GPRS mobile responding to the each polling message by generating access bursts on an uplink PDCH;
- and
- c) determining a position of the GPRS mobile as a function of the received access bursts on the PDCH.
A method of locating a Class A and Class B GPRS mobile in a GSM wireless communications network, comprising the steps of:
- a) a serving GPRS node sending a positioning indication, priority level and positioning method to be used in a paging message to the GPRS mobile, the paging message indicating the paging message is for positioning the GPRS mobile;
- b) the GPRS mobile setting up a normal GSM connection if GSM is indicated as the positioning method, the GSM wireless communications network performing TOA positioning on the GPRS mobile according to normal GSM TOA method;
- and
- c) performing TOA positioning according to a GPRS Class C method if GPRS is indicated as the positioning method.
Dependencies are inferred from the claim text.