Kuo-Chih Chu This email address is being protected from spambots. You need JavaScript enabled to view it.1, Wei-Tsong Lee2 and Chin-Ping Tan3

1Department of Electronic Engineering, Lunghwa University of Science and Technology, Taoyuan, Taiwan 333, R.O.C.
2Department of Electrical Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
3Askey Computer Corporation, Taipei, Taiwan, R.O.C.


 

Received: June 28, 2006
Accepted: October 3, 2006
Publication Date: December 1, 2007

Download Citation: ||https://doi.org/10.6180/jase.2007.10.4.06  


ABSTRACT


Currently, the most popular standard adopted in cable network is the Data-Over-Cable Service Interface Specifications (DOCSIS) protocol. For supporting emerging multimedia applications, several QoS mechanisms and service types were defined in DOCSIS. DOCSIS, however, did not specify how to schedule these QoS-enabled traffics and thus this paper tries to offer a priority-based scheduling scheme with dynamic channel assignment to support the Unsolicited Grant Service (UGS). By considering the tolerated jitter and throughput of each request, we defined certain priority equations and channel assignment rules for the service scheduling. According to simulation results, our solution, named Priority-based Channel Assignment Scheme (P-CAS), provides decent service delivery rate, channel utilization ratio, channel load balance, and fair bandwidth utilization.


Keywords: Data-Over-Cable Service Interface Specifications (DOCSIS), Hybrid Fiber Coaxial (HFC), Cable Network, Quality of Service (QoS)


REFERENCES


  1. [1] Cable Television Laboratories, Inc., Data-over-Cable Service Interface Specifications, Radio Frequency Interface Specification, CM-SP-RFI2.0-I11-060602 (2006).
  2. [2] IEEE 802.14 Cable-TV Functional Requirements and Evaluation Criteria, Doc. #: IEEE 802.14-94/002R2 (1995).
  3. [3] Xiao, X. and Ni, L. M., “Internet QoS: A Big Picture,” IEEE Network, Vol. 13, pp. 818 (1999)
  4. [4] Ferguson, P. and Huston, G., Quality of Service: Delivering QoS on the Internet and in Corporate Networks, New York: Wiley (1998).
  5. [5] Eldering, C. A., Himayet, N. and Gardner, F. M., “CATV Return Path Characterization for Reliable Communications,” IEEE Communications Magazine, Vol. 33, pp. 6269 (1995).
  6. [6] Tan, C. P., Chu, K. C. and Lee, W. T., “LSRAM: A LoSu Resource Allocation Mechanism over DOCSIS Cable Network,” Proceedings of the International Computer Symposium 2002 (2002).
  7. [7] Ramanathan, S. and Gusclla, R., “Toward Management Systems for Emerging Hybrid Fiber-Coax Access Networks,” IEEE Network, Vol. 9, pp. 5868 (1995).
  8. [8] Sheu, S. T. and Chen, M. H., “A New Network Architecture with Intelligent Node (IN) to Enhance IEEE 802.14 HFC Networks,” IEEE Transaction on Broadcasting, Vol. 45, pp. 308317 (1999).
  9. [9] Huang, N. F., Wang, C. P. and Su, C. A., “A Hierarchical HFC Network with QoS Guaranteed Traffic Policy,” IEEE Transactions on Broadcasting, Vol. 44, pp. 517526 (1998).