Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1999-12-15
2004-03-09
Olms, Douglas (Department: 2661)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S352000, C370S410000, C370S426000, C379S229000
Reexamination Certificate
active
06704314
ABSTRACT:
RELATED APPLICATIONS
Not applicable
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable
MICROFICHE APPENDIX
Not applicable
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is related to the field of communication systems, and in particular, to a system that controls cell substitution for a call.
2. Description of the Prior Art
When carrying calls, telecommunication systems break down calls into packets, blocks, frames or cells depending on the protocol of the data network. The telecommunication systems lose some cells for various reasons such as problems with telecommunication devices. The telecommunication systems use cell substitution methods to compensate for these lost cells. Some examples of cell substitution methods are white noise, repeat last cell, and silence. White noise is typically background noise inserted because of users' expectation of some noise. Repeat last cell is another method of inserting cells based on a calculation of previous cells.
FIG. 1
depicts a system level block diagram of a prior solution for using a cell substitution method. In
FIG. 1
, a call processing system
120
is disclosed in a pending U.S. patent application Ser No. 09/435,534, entitled “System and Method for Processing a Call”, filed on Nov. 5, 1999, which is hereby incorporated by reference.
FIG. 2
depicts a message sequence chart of a prior solution for using a cell substitution method. A local telephone company
110
transmits an Initial Address Message (LAM) in Signaling System #7 (SS7) for a call to a signaling processor
122
. The signaling processor
122
receives the IAM and processes the IAM. The signaling processor
122
then generates and transmits a route instruction for a routing system
124
. Subsequent signaling messages for call set up are not shown for the sake of clarity.
The routing system
124
receives the route instruction from the signaling process
122
. The routing system
124
uses one default cell substitution method that is provisioned by the user for all calls received from the local telephone company
110
. The routing system
124
then receives the call from the local telephone company
110
over a call link
112
. The routing system
124
routes the call to an Asynchronous Transfer Mode, (ATM) network
130
based on the route instruction. The routing system
124
uses the cell substitution method for lost or misinserted cells for the duration of the call.
One problem is that one cell substitution method does not provide the best performance for all different call types. The call types could be voice or data calls. Data calls are calls that carry data using modem, facsimile, or Switched 56. Different call types may use Signaling System #7, Integrated Services Digital Network, or Channel Associated Signaling for signaling and/or to carry the calls. Studies have shown that voice calls are optimized when white noise is inserted for lost or misinserted cells. Studies have also shown that data call performance improves when the repeat last cell method is used to substitute for lost or misinserted cells.
One cell substitution method for all calls results in diminished quality for certain call types that perform better with another cell substitution method. For example, data calls lose some data using a cell substitution method such as white noise that is optimal for voice calls. To improve call quality, telecommunication service providers need to utilize different cell substitution methods for different type of calls.
SUMMARY OF THE INVENTION
The invention solves the above problem by determining a cell substitution method based on information for a call. A communication system advantageously uses an optimal cell substitution method for each different type of call. Thus, optimizing the performance of each call type with the appropriate optimal cell substitution method improves the quality for all call types. The communication system receives information for the call. The communication system then determines the cell substitution method based on the information. The communication system generates an instruction to use the cell substitution method for the call. In one embodiment of the invention, the communication system determines a call type based on the information for the call and determines the cell substitution method based on the call type. In another embodiment, the communication system uses the cell substitution method for the call based on the instruction.
REFERENCES:
patent: 4453247 (1984-06-01), Suzuki et al.
patent: 4720850 (1988-01-01), Oberlander
patent: 4926416 (1990-05-01), Weik
patent: 5051983 (1991-09-01), Kammerl
patent: 5101404 (1992-03-01), Kunimoto et al.
patent: 5163057 (1992-11-01), Grupp
patent: 5231633 (1993-07-01), Hluchyj et al.
patent: 5253247 (1993-10-01), Hirose et al.
patent: 5255266 (1993-10-01), Watanabe et al.
patent: 5274680 (1993-12-01), Sorton et al.
patent: 5285441 (1994-02-01), Bansal et al.
patent: 5323389 (1994-06-01), Bitz et al.
patent: 5327421 (1994-07-01), Hiller et al.
patent: 5345445 (1994-09-01), Hiller et al.
patent: 5345446 (1994-09-01), Hiller et al.
patent: 5357510 (1994-10-01), Norizuki et al.
patent: 5365524 (1994-11-01), Hiller
patent: 5373504 (1994-12-01), Tanaka et al.
patent: 5420858 (1995-05-01), Marshall et al.
patent: 5422882 (1995-06-01), Hiller et al.
patent: 5426636 (1995-06-01), Hiller et al.
patent: 5428607 (1995-06-01), Hiller et al.
patent: 5434852 (1995-07-01), LaPorta et al.
patent: 5452297 (1995-09-01), Hiller et al.
patent: 5453981 (1995-09-01), Katsube et al.
patent: 5459722 (1995-10-01), Sherif
patent: 5479401 (1995-12-01), Bitz et al.
patent: 5483527 (1996-01-01), Doshi et al.
patent: 5509010 (1996-04-01), LaPorta et al.
patent: 5513178 (1996-04-01), Tanaka
patent: 5530698 (1996-06-01), Kozaki et al.
patent: 5568475 (1996-10-01), Doshi et al.
patent: 5570368 (1996-10-01), Murakami et al.
patent: 5577039 (1996-11-01), Won et al.
patent: 5606553 (1997-02-01), Christie et al.
patent: 5623491 (1997-04-01), Skoog
patent: 5636210 (1997-06-01), Agrawal et al.
patent: 5703876 (1997-12-01), Christie
patent: 5729607 (1998-03-01), DeFries et al.
patent: 5771234 (1998-06-01), Wu et al.
patent: 5787086 (1998-07-01), McClure et al.
patent: 5825780 (1998-10-01), Christie
patent: 5940491 (1999-08-01), Anderson et al.
patent: 5991301 (1999-11-01), Christie
patent: 6125117 (2000-09-01), Martin et al.
patent: 6169735 (2001-01-01), Allen et al.
patent: 6181703 (2001-01-01), Christie et al.
patent: 6208618 (2001-03-01), Kenney et al.
patent: 6324174 (2001-11-01), Bharucha et al.
Wada, Iwao, “VTOA: Silence Removal Using AAL1” ATM Forum Technical Committee, ATM-Forum/95-1317, Oct. 2-6, 1995.
Babiarz, Jozef, “Timing Requirements for Voice and Telephony Over ATM,” ATM Forum Technical Committee ATM_Forum/95-1305, Oct. 1-6, 1995.
Tsuboya, Hisakazu, “Categorizing Layered cell types,” ATM Forum Technical Committee, ATM Forum/95-1290, Oct. 2-6, 1995.
Olms Douglas
Phunkulh Bob A.
Sprint Communications Company L.P.
LandOfFree
Method and apparatus to control cell substitution does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus to control cell substitution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus to control cell substitution will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3243359