Packet analysis apparatus and method thereof

• US 8,649,283 B2
• Filed: 06/14/2010
• Issued: 02/11/2014
• Est. Priority Date: 06/19/2009
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Okada, Sumiyo, Fukuyama, Noriyuki, Morinaga, Masanobu, Miyazaki, Hideaki
• Primary Examiner(s): Chriss, Andrew
• Assistant Examiner(s): Javaid, Jamal
• Application Number:
  US12/814,811
• Publication Number:
  US 20100322095A1
• Time in Patent Office: 1,338 Days
• Field of Search: 370/252, 370/356, 370/412, 370/337, 704/233, 704/208, 704/214, 704/207, 704/219, 455/452.2, 455/436
• US Class Current: 370/252
• CPC Class Codes: H04L 43/0835 One way packet loss
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]

Abstract

A method executed by a packet analysis apparatus for analyzing packets including voice packets and non-voice packets includes: capturing packets in a specific session; storing the captured packets in a storage; screening the stored packets to count up a receipt count of voice packets; determining whether packet loss has occurred in the specific session; and determining whether loss packets are voice packets in accordance with received packets adjacent to the loss packets to count up a loss count of voice packets when the packet loss has occurred.

Claims

1. A method executed by a packet analysis apparatus for analyzing packets including voice packets and non-voice packets, the method comprising:

capturing packets in a specific session;

storing the captured packets in a storage;

screening the stored packets to count up a receipt count of voice packets in accordance with predefined characteristics of non-voice packets, wherein the non-voice packets are dual tone multiple frequency (DTMF) packets of a DTMF event, and the predefined characteristics of non-voice packets include at least one of a retransmission count of the DTMF event, a duration of each DTMF packet, and a transmission interval of the DTMF packets, the retransmission count representing how many times a terminal packet has been retransmitted, the terminal packet being a DTMF packet transmitted as a last packet of the DTMF event, the duration being represented by a time stamp since a start time of the DTMF event, the transmission interval being an interval of transmissions of packets;

determining whether packet loss has occurred in the specific session;

determining, by the packet analysis apparatus, by substantially eliminating an influence of the non-voice packets, whether loss packets are voice packets in accordance with received packets adjacent to the loss packets to count up a loss count of voice packets when the packet loss has occurred,

determining whether the loss packets are succeeded by a retransmitted packet of the terminal packet or by DTMF packets including the retransmitted packet of the terminal packet;

calculating a total count of packets from a lead packet to the terminal packet of the DTMF event including the retransmitted packet by dividing a duration included in the retransmitted packet by a transmission interval of the DTMF packets when the loss packets are succeeded by the retransmitted packet of the terminal packet or by DTMF packets including the retransmitted packet of the terminal packet; and

determining whether the loss packets are voice packets or DTMF packets in accordance with

an amount of DTMF packets succeeding the loss packets,

the retransmission count of the terminal packet, and

the total count of packets from the lead packet to the terminal packet of the DTMF event.

2. A method executed by a packet analysis apparatus for analyzing packets including voice packets and non-voice packets, the method comprising:

capturing packets in a specific session;

storing the captured packets in a storage;

screening the stored packets to count up a receipt count of voice packets in accordance with predefined characteristics of non-voice packets, wherein the non-voice packets are dual tone multiple frequency (DTMF) packets of a DTMF event, and the predefined characteristics of non-voice packets include at least one of a retransmission count of the DTMF event, a duration of each DTMF packet, and a transmission interval of the DTMF packets, the retransmission count representing how many times a terminal packet has been retransmitted, the terminal packet being a DTMF packet transmitted as a last packet of the DTMF event, the duration being represented by a time stamp since a start time of the DTMF event, the transmission interval being an interval of transmissions of packets;

determining whether packet loss has occurred in the specific session;

determining, by the packet analysis apparatus, by substantially eliminating an influence of the non-voice packets, whether loss packets are voice packets in accordance with received packets adjacent to the loss packets to count up a loss count of voice packets when the packet loss has occurred,

determining whether the loss packets are preceded by a retransmitted packet of the terminal packet; and

determining whether the loss packets are voice packets or DTMF packets in accordance with

a location of the terminal packet and

the retransmission count of the terminal packet

when the loss packets are preceded by a retransmitted packet of the terminal packet,

the location of the terminal packet being determined in accordance with a duration included in the retransmitted packet.

3. A method executed by a packet analysis apparatus for analyzing packets including voice packets and non-voice packets, the method comprising:

capturing packets in a specific session;

storing the captured packets in a storage;

screening the stored packets to count up a receipt count of voice packets in accordance with predefined characteristics of non-voice packets, wherein the non-voice packets are dual tone multiple frequency (DTMF) packets of a DTMF event, and the predefined characteristics of non-voice packets include at least one of a retransmission count of the DTMF event, a duration of each DTMF packet, and a transmission interval of the DTMF packets, the retransmission count representing how many times a terminal packet has been retransmitted, the terminal packet being a DTMF packet transmitted as a last packet of the DTMF event, the duration being represented by a time stamp since a start time of the DTMF event, the transmission interval being an interval of transmissions of packets,

determining whether packet loss has occurred in the specific session;

determining, by the packet analysis apparatus, by substantially eliminating an influence of the non-voice packets, whether loss packets are voice packets in accordance with received packets adjacent to the loss packets to count up a loss count of voice packets when the packet loss has occurred,

determining whether the loss packets are preceded by a DTMF packet other than a retransmitted packet of the terminal packet and succeeded by a voice packet; and

determining, when the loss packets are preceded by a DTMF packet other than the retransmitted packet of the terminal packet and succeeded by a voice packet, that a loss count of DTMF packets is more than or equals to the retransmission count.

4. A method executed by a packet analysis apparatus for analyzing packets including voice packets and non-voice packets, the method comprising:

capturing packets in a specific session;

storing the captured packets in a storage;

screening the stored packets to count up a receipt count of voice packets in accordance with predefined characteristics of non-voice packets, wherein the non-voice packets are dual tone multiple frequency (DTMF) packets of a DTMF event, and the predefined characteristics of non-voice packets include at least one of a retransmission count of the DTMF event, a duration of each DTMF packet, and a transmission interval of the DTMF packets, the retransmission count representing how many times a terminal packet has been retransmitted, the terminal packet being a DTMF packet transmitted as a last packet of the DTMF event, the duration being represented by a time stamp since a start time of the DTMF event, the transmission interval being an interval of transmissions of packets;

determining whether packet loss has occurred in the specific session;

determining, by the packet analysis apparatus, by substantially eliminating an influence of the non-voice packets, whether loss packets are voice packets in accordance with received packets adjacent to the loss packets to count up a loss count of voice packets when the packet loss has occurred,

calculating a transmission interval of loss packets in accordance with a difference in time and a sequence number between previous and next packets to the loss packets;

determining whether a first condition has been satisfied, the first condition being that the transmission interval of loss packets is identical with a transmission interval of voice packets and is not identical with a transmission interval of DTMF packets;

determining that the loss packets are voice packets when the first condition has been satisfied;

determining whether a second condition has been satisfied, the second condition being that the transmission interval of loss packets is not identical with the transmission interval of voice packets and is identical with the transmission interval of DTMF packets; and

determining that the loss packets are DTMF packets when the second condition has been satisfied.

5. A method executed by a packet analysis apparatus for analyzing packets including voice packets and non-voice packets, the method comprising:

capturing packets in a specific session;

storing the captured packets in a storage;

screening the stored packets to count up a receipt count of voice packets in accordance with predefined characteristics of non-voice packets, wherein the non-voice packets are dual tone multiple frequency (DTMF) packets of a DTMF event, and the predefined characteristics of non-voice packets include at least one of a retransmission count of the DTMF event, a duration of each DTMF packet, and a transmission interval of the DTMF packets, the retransmission count representing how many times a terminal packet has been retransmitted, the terminal packet being a DTMF packet transmitted as a last packet of the DTMF event, the duration being represented by a time stamp since a start time of the DTMF event, the transmission interval being an interval of transmissions of packets;

determining whether packet loss has occurred in the specific session;

determining, by the packet analysis apparatus, by substantially eliminating an influence of the non-voice packets, whether loss packets are voice packets in accordance with received packets adjacent to the loss packets to count up a loss count of voice packets when the packet loss has occurred,

obtaining a solution of a set of simultaneous equations when a transmission interval of voice packets differs from a transmission interval of DTMF packets, the set of simultaneous equations having as variables an amount of voice packets and an amount of non-voice packets out of packets to be calculated, the packets to be calculated including the loss packets and a packet that succeeds the loss packets; and

calculating the loss count of voice packets and a loss count of DTMF packets in accordance with the solution of the set of simultaneous equations.