Method and system of data packet transmission timing for controlling bandwidth

1. A method of controlling the wait time (t w ) between the starting time of transmission of each of successive packets of known packet size (P) of a content to be transmitted to achieve a target bandwidth (B T ) during the transmission comprising:

selecting a target bandwidth (B T ) sought to be achieved during the transmission;

computing a wait time (t w ) between the starting time of the successive packets of the transmission using the algorithm

t

w

=

P

B

T

;

and

controlling the transmission of the packets so that there is a residual time (t) between the ending time of transmission of one packet and the starting time of transmission of the next packet to establish the wait time (t w ).

2. The method as claimed in claim 1 wherein the residual time t that is used is rounded to a time unit.

3. The method as claimed in claim 2 wherein the rounding to the time unit is accomplished by a counter.

4. The method as claimed in claim 1 wherein controlling the transmission of the packets further comprises:

(a) determining a time used (t used ) in the transmission of a packet, and

(b) waiting the residual time t between the ending time of transmission of one packet to the starting time of transmission of the next packet.

5. The method as claimed in claim 4 wherein the time t used is determined by:

determining the starting time t 1 of transmission of a packet;

determining the ending time t 2 of transmission of the packet, and

determining the time used t used in transmitting the packet as t 2 −t 1 .

6. The method as claimed in claim 4 further comprising repeating (a) determining a time used (t used ) in the transmission of a packet and (b) waiting the residual time t between the ending time of transmission of one packet to the starting time of transmission of the next packet for each packet transmitted.

7. A method as in claim 1 wherein the controlling of the transmission of the packets with a residual time t between successive packets is comprised of:

determining a value of starting time t start , of transmitting a packet and a current time t now ;

performing a loop operation of:

(a) computing a time t elapsed =t now −t start ,

(b) comparing t elapsed to the residual time t and transmitting the next packet when the value of t elapsed ≧t.

8. The method as claimed in claim 7 further comprising computing an error value δ=t elapsed −t and subtracting the value δ from a later supplied value of t.

9. The method of claim 1 , further comprising selecting the known packet size (P) of the packets to be transmitted.

10. The method of claim 1 wherein the known packet size (P) is provided by an application.

11. Apparatus for controlling the transmission of successive packets of known packet size (P) of a content to be transmitted to achieve a target bandwidth B T during the transmission comprising:

a computer including

a program to control transmission of a content in packets of data;

means to input and receive parameters of the size (P) of each of the packets to be transmitted and of the desired target bandwidth (B T ); and

control means to successively transmit the packets to have a residual time (t) between the ending time of transmission of one packet and the starting of transmission of the next successive packet to achieve a wait time t w between the packets such that

t

w

=

P

B

T

.

12. Apparatus as in claim 11 wherein said computer further comprises:

first means for determining the time used (t used ) in the transmission of a packet; and

wherein said control means operates based on the determined t used to wait the residual time t between the ending time of transmission of one packet to the starting time of transmission of the next packet.

13. Apparatus as in claim 12 wherein said first means comprises:

means for determining the starting time (t 1 ) of transmission of a packet;

means for determining the ending time (t 2 ) of transmission of the packet, and

means for determining the time used (t used ) in transmitting the packet as (t 2 −t 1 ).

14. Apparatus as in claim 12 wherein said control means operates to wait the residual time t between the starting time of transmission of one packet to the starting time of transmission of the next packet based on computing t w −t used .

15. Apparatus as in claim 11 further comprising means for controlling the residual time t by

determining a value of starting time t start , and a current time t now performing a loop operation of:

(a) computing a time t elapsed =t now −t start , and

(b) comparing t elapsed to the residual time t and transmitting the next packet when the value of t elapsed ≧t.

16. Apparatus as in claim 15 further comprising means for computing an error value δ=t elapsed −t and subtracting the value δ from a later supplied value of t.

17. Apparatus as in claim 11 wherein said control means further comprises a counter that operates on a periodic basis to measure the residual time t.

18. Apparatus as in claim 11 wherein said computer operates said control means to compute the residual time t based on other measured times.