Header compression mechanism for transmitting RTP packets over wireless links

• US 20090268667A1
• Filed: 04/21/2009
• Published: 10/29/2009
• Est. Priority Date: 04/28/2008
• Status: Active Grant

• Current Assignee: Vislink Technologies, Inc.
• Original Assignee: xG Technology, Inc.
• Inventors: Gandham, Shashidhar R., Muppalla, Karthikeya V.
• Granted Patent: US 8,532,106 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• CPC Class Codes: H04L 69/323 in the physical layer [OSI layer 1]
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

This disclosure describes a new a header compression method for a MAC protocol that combines contention-free and contention-based MAC protocols into a heterogeneous MAC protocol used for forwarding VoIP traffic in VoIP systems on wireless networks using multiple base stations that reduces packet overhead thus allowing for transmission of high bit-rate data to multiple users over wired and wireless means.

Claims

1. A header compression method for a medium access control protocol used for forwarding Internet Protocol packets between a base station and nodes in voice over the Internet protocol systems on a wired or wireless network comprising:

A base station in electrical communication with the Internet and having a compressor and a decompressor;

one or more nodes in wired or wireless electrical communication with said base station and each of said one or more nodes having a compressor and a decompressor;

said base station and said one or more nodes each having a medium access control protocol;

said medium access control protocol having headers and containing voice traffic Internet Protocol packets, signaling traffic Internet Protocol packets, and application data traffic Internet Protocol packets;

wherein each of said Internet Protocol packets forwarded and received from said base station from the Internet has uncompressed headers that contain fields;

wherein said voice traffic Internet Protocol packets are identified;

wherein said voice traffic Internet Protocol packets are not fragmented;

wherein said headers are compressed or decompressed on both said bass station and said one or more nodes by said compressors and decompressors;

wherein said headers compression or decompression is applied only to said voice traffic Internet Protocol packets;

said fields of said headers being categorized as never transmitted where said fields are constant, periodically transmitted where said fields periodically change, or always transmitted where said fields change with each of said Internet Protocol packets;

wherein said fields of said headers in the never transmitted fields can always be compressed and decompressed;

wherein said fields of said headers in the always transmitted fields is never compressed and decompressed; and

,

wherein when a change occurs in said fields of said headers in the periodically transmitted fields being sent from said base station or said one or more nodes a status packet indicating all information in said the fields is sent in place of voice information in said voice traffic Internet Protocol packet, an acknowledge packet is sent in reply, all information in said fields is stored in said base station and said one or more nodes and header compression and decompression begins and continues by transmitting a compressed version of the stored fields information until the next change occurs.