WO2005099188A9 - 通信品質管理方法および装置 - Google Patents
通信品質管理方法および装置 Download PDFInfo
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- WO2005099188A9 WO2005099188A9 PCT/JP2004/017281 JP2004017281W WO2005099188A9 WO 2005099188 A9 WO2005099188 A9 WO 2005099188A9 JP 2004017281 W JP2004017281 W JP 2004017281W WO 2005099188 A9 WO2005099188 A9 WO 2005099188A9
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- Prior art keywords
- quality information
- packet
- server
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
- H04L41/5003—Managing SLA; Interaction between SLA and QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/15—Flow control; Congestion control in relation to multipoint traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
Definitions
- the present invention relates to a communication quality management method and apparatus, and more particularly to a communication quality management method and apparatus for multicast distribution in which data is simultaneously distributed by multicast packets from a distribution server to a plurality of receiving terminals via a network such as the Internet.
- a network such as the Internet
- streaming refers to playback while downloading rather than playing after a user has downloaded a file when distributing audio, video, etc. over the Internet.
- FIG. 7 shows a system configuration diagram of a general conventional multicast distribution system.
- This multicast distribution system 70 has a distribution server 71 and a plurality of routers 72a—72m. Backbone network 73 and a plurality of receiving terminals 74a-74n.
- the distribution server 71 is connected to the router 72a, and one or more receiving terminals 74 are connected to each router 72b,..., 72m.
- receiving terminals 74a and 72b are connected to the router 72b, and a receiving terminal 74 ⁇ is connected to the router 72m.
- a distribution server 71 distributes multicast packets 79 to receiving terminals 74a and 74b via routers 72a and 72b.
- the multicast packet 79 is distributed to the receiving terminal 74 ⁇ via the routers 72a and 72m.
- the present invention has been made in view of the above-described problems of the prior art, and has as its object to provide a communication quality management method and apparatus that can overcome such problems and can be easily incorporated into a conventional system. .
- the communication quality management method is a communication quality management method for multicast distribution in which data is distributed from a distribution sano to a plurality of receiving terminals via a router connected to a network. Adding quality information to a multicast packet distributed from Sano, obtaining the quality information from a multicast packet distributed via the router, and receiving the multicast packet from which the quality information has been removed. Delivering to a terminal.
- the communication quality management apparatus is a communication quality management apparatus for multicast distribution that distributes data from a distribution server to a plurality of receiving terminals via a router connected to a network.
- a server-side proxy that is provided between the server and the router and assigns quality control information to the multicast packet, and is provided between the router and the receiving terminal and is assigned from the multicast packet by the server-side proxy.
- a receiving terminal-side proxy that distributes to the receiving terminal a multicast packet that includes the quality information acquiring unit and the quality information calculating Z transmitting unit that acquire the received quality information and from which the quality information has been removed, and the receiving terminal-side proxy And an aggregation server that receives and aggregates quality information.
- the communication quality management method and apparatus of the present invention the following remarkable effects in practical use can be obtained. That is, it is possible to acquire quality information in data distribution using multicast packets. In addition, quality information can be obtained simply by adding proxies to the server side and receiving terminal side without any changes to the existing distribution server, receiving terminal, and network configuration. Is possible.
- FIG. 1 is a block diagram showing an overall configuration of a first embodiment of a communication quality management apparatus according to the present invention.
- FIG. 2 is a diagram showing a specific example of the quality information header added by the server side proxy in FIG. 1.
- FIG. 3A is an explanatory view showing a packet transmitted from the distribution server and received by the receiving terminal in a first specific example of packets distributed from the distribution server to the receiving terminal.
- FIG. 3B is an explanatory diagram showing a packet delivered between proxies in a first specific example of a packet delivered from a delivery server to a receiving terminal. .
- FIG. 4A is an explanatory diagram showing a packet transmitted from the distribution server and received by the receiving terminal in the second specific example of the packet distributed from the distribution server to the receiving terminal.
- FIG. 4B is an explanatory diagram showing a packet delivered between proxies in a second specific example of a packet delivered from the delivery server to the receiving terminal.
- FIG. 5 is an operation explanatory diagram of the communication quality management device shown in FIG. 1.
- FIG. 6 is a diagram for explaining the operation of the second embodiment of the communication quality management device according to the present invention.
- FIG. 7 is a system configuration diagram of a conventional multicast distribution system.
- the communication quality management device 10 includes a distribution server 11, a server-side proxy 12, a plurality of routers 13a-13m connected to a backbone network 14 such as the Internet, and the receiving terminal side.
- a server-side proxy 12 is arranged directly under the distribution server 11, that is, between the distribution server 11 and the router 13a. Has been.
- the receiving terminal side proxy 17a-17 ⁇ is arranged before the receiving terminal 18a-18 ⁇ , that is, between each receiving terminal 18a-18 ⁇ and the router 13b-13m. Furthermore, a quality information database 16 for each receiver (or receiving terminal) is arranged in the knockbone network 14 via the aggregation server 15.
- the backbone network 14 is a network that supports multicast transfer
- the routers 13a to 13m that constitute the backbone network 14 are routers that support multicast transfer. These routers 13a-13m may be other delivery methods that support multicast forwarding.
- the server-side proxy 12 sends quality information to a multicast packet (hereinafter simply referred to as a packet) 19a to which the distribution server 11 also sends quality information 19b. It has a grant function.
- the proxy 17a-17n on the receiving terminal side sends the quality information delivered to the corresponding receiving terminal 18a-18 ⁇ as the packet 19c from which the quality information is removed from the packet 19b with the quality information transferred via the router 13a-13m. Has a removal function.
- this quality information header includes a field 21 for entering a sequence number (32 bits) for each packet, and a time for entering a time when epoch is 1970/1/1 0:00 ( Second (second) field 22 and time (microsecond) 23.
- all field lengths are each 32 bits. Different field lengths may be used as required. If there is other information based on quality control that is not in this example, use another quality information header with a field to store the information.
- FIG. 3A shows an example of a packet 19a (or 19c) transmitted from the distribution server 11 and distributed to the receiving terminal 18 that is the final recipient.
- FIG. 3B shows a specific example of a packet 19b distributed between proxies, that is, between the server side proxy 12 and each receiving terminal side proxy 17.
- the knot 19c includes an IP (Internet Protocol) header 31, a UDP (User
- the packet 19b shown in FIG. 3B includes an IP header 34, a UDP header 35, a quality information header 36, an IP header 37, a UDP header 38, and stream data 39.
- the IP header 37, UDP header 38, and stream data 39 of the packet 19b are the same as the IP header 31, UDP header 32, and stream data 33 of the packet 19a (or 19c), respectively. Yes, it is used as it is without any change, and a quality information header 36, UDP header 35 and IP header 34 are newly added to form a new packet 19b. In this example, since the original packet 19a cannot be held at all, processing is easy.
- FIGS. 4A and 4B show other examples of packets.
- FIG. 4A shows an example of a packet 19a transmitted from the distribution server 11, that is, a packet 19c distributed to each receiving terminal 18.
- FIG. 4B shows an example of a packet 19b between the server-side proxy 12 and the receiving terminal side 17.
- the packet 19a or 19c is similar to the case of FIG. 3A in that it includes an IP header 41, a UDP header 42, and stream data 43 as shown in FIG. 4A.
- the inter-proxy packet 19b is composed of an IP header 44, a UDP header 45, a quality information header 46, and stream data 47.
- the IP header 44, UDP header 45, and stream data 47 of the packet 19b are transferred to the IP header 41 and UDP in FIG. Since it is basically the same as the header 42 and the stream data 43, only the quality information header 46 is stored between the UDP header 45 and the stream data 47. In this case, since the packet length, checksum value, and the like change, it is necessary to rewrite these fields in accordance with the new packet 19b. However, compared with the example of FIGS. 3A and 3B, there is an advantage that the bucket length is short. In addition, packet formats other than those shown in FIGS. 3A, 3B, 4A, and 4B may be used.
- the distribution server 11 sends out a multicast packet 19a including the stream data 33 and 43 shown in FIG. 3A or FIG. 4A.
- the server-side proxy 12 receives the packet 19a transmitted by the distribution server 11, and the quality information header 12A included in the server-side proxy 12 includes a quality information header (36 in FIG. 3A or FIG. 4A). 46) is sent to the received packet 19a.
- the packet 19b with the quality information header transmitted from the server-side proxy 12 is transferred by the router (or other delivery means) 13a-13m, and is received by the receiving terminal-side proxy 17 arranged in front of the receiving terminal 18. Received.
- the receiving terminal side proxy 17 includes a quality information acquisition unit 17A and a quality information calculation Z transmission unit 17B. Then, the quality information acquisition unit 17A removes the quality information header 36 or 46 from the received packet 19b. Then, the packet 19 c is transmitted to the corresponding receiving terminal side 18. Further, the quality information acquisition unit 17A acquires the quality management information from the quality information headers 36 and 46, and sends it to the quality information calculation Z transmission unit 17B.
- the quality information calculation Z transmission unit 17B can know the number of packets lost during distribution by looking at the sequence number in the quality management information for each packet.
- the sequence number of the next received packet is 1059 after receiving the packet of sequence number 1056.
- the sequence number of the next received packet is 1059 after receiving the packet of sequence number 1056.
- the number of missing packets is counted and sent to the aggregation server 15 at regular intervals.
- the quality information calculation Z transmission unit 17B takes the difference between the time when the packet was received and the time stamp in the quality management information, so that the distribution delay (that is, the proxy on the server side) for each packet. 12 to the receiving terminal side proxy 17).
- the quality information calculation Z transmission unit 17B records the distribution delay for each packet, and transmits the average value and the variance value to the aggregation server 15 at regular intervals.
- the quality information calculation Z transmission unit 17B can obtain information on “fluctuation (or jitter)” from two packets received in succession. For example, if the time stamps in the quality control information of two packets 19b received in succession are tal and ta2 and the reception times of these packets 19b are tbl and tb2, the transmission interval between the two packets in the server side proxy 12 is (ta2-tal), the reception interval of the two packets in the reception side proxy 17 is (tb2-tbl).
- packet loss information, delivery delay information, and “fluctuation” information 51 are transmitted from the quality information transmitting unit 17 B of the receiving terminal side proxy 17 to the counting server 15.
- the information 51 transmitted to the aggregation server 15 is aggregated for each receiver (that is, the receiving terminal 18) and stored in the quality information database 16 as packet quality information 52 for each receiving terminal 18.
- the communication quality management device 60 shown in FIG. 6 includes a distribution server 11, a server side proxy 12, a plurality of routers 13a-13m, a plurality of receiving terminal side proxies 17, a plurality of receiving terminals 18, an aggregation server 15, and a quality control. Consists of server 20. That is, the difference is that a quality management server 20 is provided in place of the quality information database 16 for each receiver in the first embodiment shown in FIG.
- Packet quality collected in the aggregation server 15 by being acquired by the quality information acquisition unit 17A of the reception terminal side proxy 17 provided for each reception terminal 18 and transmitted from the quality information calculation Z transmission unit 17B to the aggregation server 15 Information 52 is sent to the quality control server 20.
- the quality management server 20 Based on the quality information 52 sent from the aggregation server 15, the quality management server 20 The reception quality of each receiving terminal 18 is improved by performing QoS (Quality of Service) setting 53 for each router 13 in the backbone network 14.
- QoS Quality of Service
- QoS setting 53 of each router is executed as follows.
- the bandwidth control is set in the router 13 to secure the necessary bandwidth for packet distribution.
- priority control is set in the router 13 so that packet transfer is prioritized over other packets.
- QoS is set for each router 13 in the knockbone network 14 and the distribution quality of the corresponding packet is set. Secure.
- the receiving terminal 18 while the receiving terminal 18 receives a packet, information on quality is sent from the receiver-side proxy 12 to the aggregation server 15 at regular intervals.
- the number of recipients at the current time can be grasped on the server 15 side. Therefore, the following control according to the number of recipients can be performed.
- QoS setting 53 an arbitrary method may be used as an algorithm for determining which router 13 in the backbone network 14 performs QoS setting.
- a method of registering in advance a pair with a router for setting QoS may be used.
- the status of the router 13 in the backbone network 14 is checked, and QoS setting 53 is performed only for the router with a high load. ! /
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Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/591,245 US7639682B2 (en) | 2004-03-05 | 2004-11-19 | Communication quality management and apparatus |
JP2006511910A JPWO2005099188A1 (ja) | 2004-03-05 | 2004-11-19 | 通信品質管理方法および装置 |
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JP2004-062320 | 2004-03-05 | ||
JP2004062320 | 2004-03-05 |
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WO2005099188A1 WO2005099188A1 (ja) | 2005-10-20 |
WO2005099188A9 true WO2005099188A9 (ja) | 2006-08-24 |
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US (1) | US7639682B2 (ja) |
JP (1) | JPWO2005099188A1 (ja) |
CN (1) | CN1926816A (ja) |
WO (1) | WO2005099188A1 (ja) |
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JP4305717B2 (ja) * | 2002-05-23 | 2009-07-29 | ソニー株式会社 | 情報処理装置および方法、記録媒体、並びにプログラム |
JP2003348133A (ja) | 2002-05-27 | 2003-12-05 | Hitachi Ltd | ネットワーク情報処理方法 |
JP2004246632A (ja) * | 2003-02-14 | 2004-09-02 | Hitachi Ltd | データ分配サーバ、プログラム及びネットワークシステム |
-
2004
- 2004-11-19 CN CNA2004800422169A patent/CN1926816A/zh active Pending
- 2004-11-19 JP JP2006511910A patent/JPWO2005099188A1/ja active Pending
- 2004-11-19 US US10/591,245 patent/US7639682B2/en not_active Expired - Fee Related
- 2004-11-19 WO PCT/JP2004/017281 patent/WO2005099188A1/ja active Application Filing
Also Published As
Publication number | Publication date |
---|---|
JPWO2005099188A1 (ja) | 2008-03-06 |
US20080095159A1 (en) | 2008-04-24 |
CN1926816A (zh) | 2007-03-07 |
WO2005099188A1 (ja) | 2005-10-20 |
US7639682B2 (en) | 2009-12-29 |
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