초록 ▼

The invention provides a method and system for providing route guidance information from a base unit to a remote unit in response to a request from the remote unit. The remote unit may be a mobile unit or a fixed unit. A query is formatted at the remote unit, the query including the request, and com

The invention provides a method and system for providing route guidance information from a base unit to a remote unit in response to a request from the remote unit. The remote unit may be a mobile unit or a fixed unit. A query is formatted at the remote unit, the query including the request, and communicated from the remote unit to the base unit. The requested route guidance information is calculated at the base unit in response to the query, using a database located at the base unit. A response to the query is formatted at the base unit, the response including the route guidance information. The response is communicated from the base unit to the remote unit for display.

대표청구항 ▼

[ What is claimed is:] [1.] A method of providing navigation information from a base unit to a plurality of remote units, including a plurality of mobile units each of which communicates with the base unit via a wireless communication link, the method comprising the steps of:from said plurality of r

[ What is claimed is:] [1.] A method of providing navigation information from a base unit to a plurality of remote units, including a plurality of mobile units each of which communicates with the base unit via a wireless communication link, the method comprising the steps of:from said plurality of remote units, formatting query messages requesting navigation services, wherein said query messages are formatted according to a protocol specifying an arrangement of data bits and control bits, and further wherein each query message includes a plurality of fields, including a subscriber identifier field, a query message identifier field, and at least one more field specifying a request for navigation information services,wherein data included in each subscriber identifier field of each query message uniquely identify which of said plurality of remote units formatted the message of which the subscriber identifier field is a part, andwherein said query message identifier field uniquely identifies the query message of which said message identifier field is a part;from each of said plurality of remote units, transmitting said formatted query messages to the base unit;at said base unit, receiving each of said query messages;at said base unit, with respect to each of said query messages that requests a navigation information service, formatting a reply message, wherein each reply message is formatted according to a protocol specifying an arrangement of data bits and control bits, and further wherein each reply message includes a plurality of fields, including a field that contains navigation information that fulfills said request for service in the query message to which said reply message is in response; andfrom said base unit, transmitting each of said reply messages to the remote units of said plurality of remote units, from which respective query messages were sent.