Method and Circuit for Calculating a Timeout Parameter in a Communication Session

• US 20080232405A1
• Filed: 08/24/2006
• Published: 09/25/2008
• Est. Priority Date: 08/25/2005
• Status: Abandoned Application

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Gallo, Francesco
• Application Number:
  US12/064,385
• Publication Number:
  US 20080232405A1
• Time in Patent Office: Days
• US Class Current: 370/498
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/115 using a dedicated packet
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 47/36 by determining packet size, e.g. maximum transfer unit [MTU]
• CPC Class Codes: H04L 69/28 Timers or timing mechanisms used in protocols

Abstract

A method for calculating a timeout parameter in a communication session, comprises the steps of initiating a session; calculating a throughput of the connection during initialisation of the session by measuring a time span between sending and receiving a data packet on a target communication device 101 including a fixed computational time delay of the initiator communication device 102, wherein the packets are smaller than a maximum packet size; calculating a maximum round trip time for the maximum data packet that is possible to be sent and received based on the calculated throughput; and setting a session timeout parameter equal to the calculated maximum round trip time.

Claims

1. Method of calculating a timeout parameter in a communication session, comprising:

initiating a session;

calculating a throughput of the connection during initialisation of the session by measuring a time span between sending a first data packet and receiving a second data packet on a target communication device including a fixed computational time delay of the initiator communication device, wherein the packets are smaller than a maximum packet size;

calculating a maximum round trip time for the maximum data packet that is possible to be sent and received based on the calculated throughput;

setting a session timeout parameter equal to the calculated maximum round trip time.

2. The method according to claim 1, wherein the difference in size between the data packets sent during session initialisation and the maximum packet size is large.

3. The method according to claim 1, wherein the data packet size used to calculate the throughput depends on the number of bytes in a Transport Data Field.

6. A computer readable media containing a computer executable programme for performing the method of claim 1.

4. Circuit for contact-less communication, said circuit is designed to perform a calculation of a timeout parameter in a communication session comprising:

a means for calculating a throughput of the connection;

a means for calculating a maximum round trip time for the maximum data packet that is possible to be sent and received based on the calculated throughput;

a means for setting a session timeout parameter equal to the calculated maximum round trip time.

5. Communication device comprising a circuit according to claim 4.

7. A computer programme product comprising software portions performing on a computer when executed a calculation of a timeout parameter in a communication session, comprising:

initiating a session;

calculating a throughput of the connection during initialisation of the session by measuring a time span between sending a first data packet and receiving a second data packet on a target communication device including a fixed computational time delay of the initiator communication device, wherein the packets are smaller than a maximum packet size;

calculating a maximum round trip time for the maximum data packet that is possible to be sent and received based on the calculated throughput;

setting a session timeout parameter equal to the calculated maximum round trip time.

8. The computer program product according to claim 7, wherein the difference in size between the data packets sent during session initialisation and the maximum packet size is large.

9. The computer program product according to claim 7, wherein the data packet size used to calculate the throughput depends on the number of bytes in the Transport Data Field.