US 6,724,753 B2Granted

Control interface protocol for telephone sets for a satellite telephone system

AssigneeQUALCOMM Incorporated

InventorsClement B. Edgar, III, R. Nicholson Gibson

Life of this patent

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Abstract

A control interface protocol governs communications in a satellite telephone system. The satellite telephone system comprises a radio antenna unit (RAU) and a plurality of desksets connected to the RAU. An interface bus connects the desksets to the RAU. The RAU and the desksets communicate with each other by packets. Each packet comprises a start of header (SOH) byte, an address number (ADDR) byte, a command (CMD) byte, an argument (ARG) and a block check character (BCC). The ADDR byte comprises a source and a destination address of the packet. All packets, except negative acknowledgment (NAK) packets from the desksets, are acknowledged by the RAU. The packets originating from the desksets are tagged with an address of the desksets. A packet to a specific deskset includes a destination address. A packet originating from the RAU to all desksets includes a first default address. A packet originating from the RAU to a deskset that does not have an address includes a second default address.

Claims1

Dependent claims

A method of handling error control for packet communications between a common node and a plurality of terminals that are connected to the common node by a digital interface bus, comprising the steps of:

sending a packet having a modulo-sequential sequence number from the common node to one of the terminals;
sending a negative acknowledgment (NAK) from said one of the terminals to the common node when an error or unexpected sequence number is detected in the sent packet, wherein said NAK includes a sequence number of a last valid racket received;
determining that the sent packet is new when the sequence number in the sent packet is greater than a sequence number of a previous packet;
determining that the sent packet is repeated when the sequence number of the sent packet equals the sequence number of the previous packet;
determining that a packet is repeated when the sequence number of the sent packet is N less than the sequence number of the previous packet, where N is a predetermined threshold;
detecting a bad sequence number otherwise;
and
sending a reboot command from the common node to said one of the terminals when a NAK is received at the common node from said one of the terminals.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/732,805Filed 7 Dec 2000 · division
Priority: 30 Nov 1998
Published: US 2001/0005377 A128 Jun 2001
Granted: 20 Apr 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04M 9/02
Arrangements for interconnection not involving centralised switching: involving a common line for all parties
H04B 7/18582
Satellite systems for providing broadband data service to individual earth stations: arrangements for data linking, i.e. for data framing, for…
H04L 1/1809
Automatic repetition systems, e.g. Van Duuren systems: selective-repeat protocols
H04L 1/1838
Buffer management: for semi-reliable protocols, e.g. for less sensitive applications such as streaming video