QOS protection system
AssigneeNEC Corporation
InventorNaohiro Shimada
Life of this patent
Estimating the term…
Abstract
A QOS protection system can switch a current system and a reserved system depending upon degradation of quality through monitoring of arriving condition of packet to perform transmission with guarantee of QOS. The QOS protection system in a redundant system includes detection means for monitoring the packet flow and detecting at least the quality of degradation of the packet flow and switching means for performing switching between the current system and the reserved system when the detection means detects degradation of quality.
Claims11
A QOS protection system in a redundant system including a current system and a reserved system for monitoring packet flow to detect at least one defect among section, line and path and recovering from the defect, said QOS protection system comprising:
- detection means for monitoring said packet flow and detecting at least the quality of degradation of said packet flow, said detection means comprising packet defect detection means for counting number of packets input through respective paths of said current system and said reserved system, comparing the results of counting to detect degradation due to late arrival, loss of packet and packet error, and outputting a switching command when degradation of said packet flow is detected;
- and
- switching means for performing switching according to said output switching command between said current system and said reserved system when said detection means detects degradation of quality of said packet flow.
A QOS protection system in a redundant system including a current system and a reserved system for monitoring packet flow to detect at least one defect among section, line and path and recovering from the defect, said QOS protection system comprising:
- detection means for monitoring said packet flow and detecting at least the quality of degradation of said packet flow, said detection means comprising packet defect detection means for comparing a difference between an expected packet arriving period and an actual packet arriving period in said current system and a difference between an expected packet arriving period and an actual packet arriving period in said reserved system, to detect packet variation in said packet flow, and outputting a switching command when degradation of said packet flow is detected;
- and
- switching means for performing switching according to said output switching command between said current system and said reserved system when said detection means detects degradation of quality of said packet flow.
A QOS protection system in a redundant system including a current system and a reserved system for monitoring packet flow to detect at least one defect among section, line and path and recovering from the defect, said QOS protection system comprising:
- detection means for monitoring said packet flow and detecting at least the quality of degradation of said packet flow, said detection means adding a serial number for respective packet to be transmitted on a transmission side, comparing the serial number added for respective packets of said current system and said reserved system on a reception side for detecting degradation of quality, and outputting a switching command when degradation of said packet flow is detected;
- and
- switching means for performing switching according to said output switching command between said current system and said reserved system when said detection means detects degradation of quality of said packet flow.
A QOS protection system in a redundant system including a current system and a reserved system for monitoring packet flow to detect at least one defect among section, line and path and recovering from the defect, said QOS protection system comprising:
- detection means for monitoring said packet flow and detecting at least the quality of degradation of said packet flow, said detection means adding a time information for respective packet to be transmitted on a transmission side, comparing the time information added for respective packets of said current system and said reserved system on a reception side for detecting degradation of quality, and outputting a switching command when degradation of said packet flow is detected;
- and
- switching means for performing switching according to said output switching command between said current system and said reserved system when said detection means detects degradation of quality of said packet flow.
A QOS protection system in a redundant system including a current system and a reserved system for monitoring packet flow to detect at least one defect among section, line and path and recovering from the defect, said QOS protection system comprising:
- detection means for monitoring said packet flow and detecting at least the quality of degradation of said packet flow, said detection means comprising packet defect detection means that comprises a loss of packet detection portion for detecting loss of packet from an input packet flow, a packet error detection portion for detecting packet error from said input packet flow, a packet delay detection portion for detecting packet delay from said input packet flow, and a packet variation detection portion for detecting packet variation from said input packet flow, said packet defect detection means further outputting a switching command when degradation of said packet flow is detected;
- and
- switching means for performing switching according to said output switching command between said current system and said reserved system when said detection means detects degradation of quality of said packet flow.
Dependencies are inferred from the claim text.