Method for selecting a codec as a function of the network capacity

• US 8,248,935 B2
• Filed: 07/26/2006
• Issued: 08/21/2012
• Est. Priority Date: 08/05/2005
• Status: Active Grant

• Current Assignee: Avaya GmbH & Company KG (Avaya Incorporated)
• Original Assignee: Avaya GmbH & Company KG (Avaya Incorporated)
• Inventors: Röβler, Georg
• Primary Examiner(s): Weidner, Timothy J
• Application Number:
  US11/460,022
• Publication Number:
  US 20070165644A1
• Time in Patent Office: 2,218 Days
• Field of Search: None
• US Class Current: 370/232
• CPC Class Codes: H04M 1/2535 adapted for voice communication over an Internet Protocol [IP] network Voice over Internet Protocol (VoIP) network equipment and services H04M7/006; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04M 7/0072 Speech codec negotiation H04L65/1069 takes precedence

Abstract

The invention relates to a method for selecting a codec for transmission of audio and/or video data between terminals (1, 3) through a packet switching connection (2), the terminals (1, 3) selecting the codec from a codec list, characterized in that the codec list for a new connection is determined by means of a table in which for at least one destination address range, the associated transmission capacity is indicated and the table is automatically updated through measurements, as well as a terminal for carrying out the method.

Claims

1. A method for selecting a codec, comprising:

a terminal determining a codec list for a new packet-switched connection between terminals using a table in which a transmission capacity associated with a destination address range is indicated for at least one destination address, wherein the terminal selects the codec from the codec list, wherein the codec transmits at least one of audio and video data between at least two terminals through the new packet-switched connection;

the terminal measuring transmission capacities associated with the destination address range;

the terminal automatically updating the table by creating table entries based on the transmission capacity measurements, wherein the table entries include a confidence interval associated with a confidence in one of the transmission capacity measurements; and

the terminal providing the updated table for subsequent packet switched connections.

2. The method according to claim 1, wherein a sequence of codecs in the codec list expresses a preference for a selection of codec.

3. The method according to claim 1, wherein at least one transmission capacity measurement is effected while a connection exists between two terminals.

4. The method according to claim 1, wherein at least one transmission capacity measurement is effected by means of pairs or sequences of packets.

5. The method according to claim 1, wherein the table contains a default entry, which is valid for all destination addresses.

6. The method according to claim 1, wherein each table entry additionally contains a codec list.

7. The method according to claim 1, wherein each table entry additionally contains a time of measurement.

8. The method according to claim 1, wherein, for selecting the codec, a table entry is used whose address range coincides to a largest extent with an address of a distant end.

9. The method according to claim 1, wherein the codec is changed while a data connection exists.

10. The method according to claim 1, wherein the table is updated through correction of one or several table entries.

11. The method according to claim 1, wherein the table is updated through clearing up the table.

12. The method according to claim 1, wherein a packet-oriented connection is a VoIP (Voice over IP) connection.

13. The method according to claim 1, wherein a result of a measurement is exchanged between terminals associated with the destination address range.

14. The method according to claim 1, wherein the confidence interval is based on a time when the transmission capacity measurement was made.

15. A terminal, comprising:

a table data structure stored at the terminal in which, for at least one destination address range, an associated transmission capacity is indicated;

a module operable to;

determine, from the table, a codec list for a new packet-switched connection between the terminal and another terminal;

measure transmission capacities for the new packet-switched connection between the terminal and the another terminal;

automatically update the table by creating table entries based on the transmission capacity measurements, wherein the table entries include a confidence interval associated with a confidence in one of the transmission capacity measurements; and

provide the updated table for subsequent packet switched connections.

16. The terminal of claim 15, wherein a sequence of codecs in the codec list expresses a preference for a selection and wherein at least one transmission capacity measurement is effected while a connection exists.

17. The terminal of claim 15, wherein at least one transmission capacity measurement is effected by means of pairs or sequences of packets, wherein the table contains a default entry, which is valid for all addresses, and wherein each table entry additionally contains a codec list.

18. The terminal of claim 15, wherein each table entry additionally contains a time of measurement, wherein, for selecting the codec, the table entry is used whose address range coincides to a largest extent with an address of a distant end wherein the codec can be changed while a data connection exists, and wherein the table is updated through correction of one or several table entries.

19. The terminal of claim 15, wherein the table is updated through clearing up the table, wherein a packet-oriented connection is a VoIP (Voice over IP) connection, and wherein a result of a measurement is exchanged between the terminal and the another terminal.

20. The terminal of claim 15, wherein the confidence interval is based on a time when the transmission capacity measurement was made.