Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1998-04-24
2001-07-24
Jung, Min (Department: 2663)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S536000
Reexamination Certificate
active
06266345
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to data transmission. More specifically, the present invention relates to a method and apparatus for dynamically allocating bandwidth to data with varying bit rates.
BACKGROUND OF THE INVENTION
Asynchronous Transfer Mode (ATM) is a high-speed connection-oriented multiplexing and switching method specified in international standards utilizing fixed-length cells to support multiple types of traffic. ATM has become a popular solution for digital broadcast signals transmitted over transmission mediums using the Synchronous Optical Network (SONET) and the Synchronous Digital Hierarchy (SDH) transport standard. The SONET transport standard has traditionally supported data transmission at frequencies of 1.5, 6, 45, and 140 megabits per second (MB/s). The SDH transport standard has traditionally supported data transmission at frequencies of 2, 8, 34, and 140 MB/s.
ATM allows data streams with varying bit rates to be effectively mapped onto transmission mediums using the SONET and SDH transport standards. ATM segments a data stream and writes the segmented data stream into payload sections of ATM cells that are transmitted on the transmission medium. ATM varies the density of the data written into each ATM cell which allows the data stream to be transmitted on the transmission medium at the appropriate rate.
One drawback of the ATM solution is that it may be expensive to implement. The ATM solution requires a complex network management system to support its switched network, multi-path environment. In addition, when transmitting large amounts of data, the data is required to be segmented into many small ATM cells no larger than 53 bytes which translates to additional overhead which is undesirable. Data transmission applications such as digital broadcasts are single-path, uni-direction applications that require large amounts of data to be transmitted. Digital broadcast applications that implement ATM do not utilize all the functionalities of ATM while incurring many of its drawbacks.
Thus, a more efficient method and apparatus for dynamically allocating bandwidth to data with varying bit rates is needed.
SUMMARY OF THE INVENTION
A method and apparatus for dynamic allocation of bandwidth to data with varying bit rates are disclosed in which a plurality of virtual channels to transmit a stream of data are allocated on a transmission medium supporting a transport standard capable of transmitting data at multiple different frequencies. The stream of data is transmitted on the allocated virtual channels. The stream of data is transmitted on the allocated virtual channels at a lowest frequency among the multiple different frequencies within the transport standard supported by the transmission medium.
REFERENCES:
patent: 5065396 (1991-11-01), Castellano et al.
patent: 5265095 (1993-11-01), Fiedler et al.
patent: 5444711 (1995-08-01), Mizuguchi et al.
patent: 5680400 (1997-10-01), York
patent: 5825766 (1998-10-01), Kobayashi et al.
patent: 5841760 (1998-11-01), Martin et al.
patent: 5850387 (1998-12-01), Lyon et al.
patent: 5878039 (1999-03-01), Gorshe et al.
patent: 5923671 (1999-07-01), Silverman
patent: 5970067 (1999-10-01), Sathe et al.
patent: 6002670 (1999-12-01), Rahman et al.
Blakely , Sokoloff, Taylor & Zafman LLP
Jung Min
Ni Xuan Zhon
LandOfFree
Method and apparatus for dynamic allocation of bandwidth to... 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 for dynamic allocation of bandwidth to..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for dynamic allocation of bandwidth to... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2525673