Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Reexamination Certificate
2011-03-22
2011-03-22
Yao, Kwang B (Department: 2473)
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
C370S235000, C370S317000, C370S342000, C370S401000, C370S477000
Reexamination Certificate
active
07911945
ABSTRACT:
The present invention concerns methods for efficiently supporting Voice over Internet Protocol (VoIP) on the Forward Packet Data Channel (F-PDCH) in CDMA 2000 1xEV-DV systems. Active speech in VoIP is encoded using, for example enhanced variable rate codec (EVRC), which produces 171, 80 and 16 bits per 20 ms of speech for Rate 1, Rate ½ and Rate ⅛, respectively. However, about 60% of the time a user is inactive during a speech session, so an inordinate amount of system bandwidth is comprised of rate ⅛ VoIP packets. In one embodiment of the present invention the apparatus of the present invention identifies the Rate ⅛ voice frame packets and discards them. In another embodiment of the present invention, the apparatus of the present invention identifies the Rate ⅛ voice frame packets and selects some of them for further transmission. In both embodiments the efficiency of channel utilization is increased since the amount of channel band width used to communicate relatively little information, e.g., gaps of silence, is decreased.
REFERENCES:
patent: 5615214 (1997-03-01), Chandos et al.
patent: 5897613 (1999-04-01), Chan
patent: 6285682 (2001-09-01), Proctor et al.
patent: 6366880 (2002-04-01), Ashley
patent: 6381568 (2002-04-01), Supplee et al.
patent: 6438131 (2002-08-01), Gerber et al.
patent: 6665317 (2003-12-01), Scott
patent: 6697353 (2004-02-01), Bharucha et al.
patent: 6879581 (2005-04-01), Leung
patent: 7386327 (2008-06-01), Ryu et al.
patent: 2001/0043577 (2001-11-01), Barany et al.
patent: 2002/0101844 (2002-08-01), El-Maleh et al.
patent: 2002/0118650 (2002-08-01), Jagadeesan et al.
patent: 2002/0196743 (2002-12-01), Thalanany et al.
patent: 2003/0039259 (2003-02-01), Madour
patent: 2003/0133408 (2003-07-01), Cheng et al.
patent: 2004/0047366 (2004-03-01), Chowdhury
patent: 2004/0081133 (2004-04-01), Smavatkul et al.
patent: 2004/0160979 (2004-08-01), Pepin et al.
patent: 2005/0265284 (2005-12-01), Hsu et al.
patent: 2005/0286536 (2005-12-01), Steinheider et al.
patent: 2006/0062177 (2006-03-01), Asthana et al.
patent: WO-2005/099190 (2005-10-01), None
Nippon Telegraph & Telephone et al., Patent Abstract of Japan, “Voice Packet Transmitting/Receiving Device”, JP 10285212 A, Oct. 23, 1998.
“Physical Layer Standard for cdma2000 Spread Spectrum Systems, Release C”, 3GPP2 standard specification, C.S0002-C v1.0, May 28, 2002.
“Enhanced Variable Rate Codec (EVRC)”, 3GPP2 standard specification, C.S0014-0 v1.0, Dec. 1999.
“Link-Layer Assisted Robust Header Compression Service Options for Voice-over-IP Operation”, 3GPP2 standard specification, 3GPP2 S.P9021 v0.1, Sep. 3, 2002.
“Robust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP and uncompressed”, C. Burmeister et al., RFC 3095, Jul. 2001.
“Robust Header Compression (ROHC): A Link-Layer Assisted Profile for IP/UDP/RTP”, L-E. Jonsson et al., Apr. 2002.
Greer Steven Craig
Liu Zhigang
Ma Lin
Pi Zhouyue
Rong Zhigang
Harrington & Smith
Nokia Corporation
Rutkowski Jeffrey M
Yao Kwang B
LandOfFree
Apparatus and method for efficiently supporting VoIP in a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for efficiently supporting VoIP in a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for efficiently supporting VoIP in a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2746184