Method for down-speeding in an IP communication network
First Claim
1. A method of adjusting a flow rate of data transmitted from a first conference device and received at a second conference device wherein a current packet loss consecutively is being measured in the data received at a second conference terminal, the method comprising:
- calculating a new value for a first parameter by adding a weighted first fraction of a last value of the first parameter and a weighted second fraction of the current packet loss, wherein the first fraction is higher than said second fraction,if the current packet loss is lower than a predefined first threshold, thencalculating a new value for a second parameter by adding a weighted fraction of a last value of said second parameter and a weighted fraction of the current packet loss, wherein the last value is weighted higher than the current packet loss,if the first parameter is higher than a predefined second threshold, thenreducing the flow rate of data transmitted from the first conference device with a third fraction of the amount of the current packet loss,if the second parameter is higher than a predefined third threshold, thenreducing the flow rate of data transmitted from the first conference device with a fourth fraction of the current packet loss.
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Abstract
The present invention discloses a method for providing a packet loss detection and down speeding mechanism for maintaining acceptable quality during a video call. Different scenarios of packet loss requiring different down speeding degrees are accommodated by a two-parted method combined by a low-part and a high-part decision and down speeding mechanisms. The method has a consecutively measured packet loss as input, and uses weighted packet loss parameter of recently measured packet loss to decide whether to down speed, and if so, whether the low-part or high-part down speeding mechanism should be used.
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Citations
8 Claims
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1. A method of adjusting a flow rate of data transmitted from a first conference device and received at a second conference device wherein a current packet loss consecutively is being measured in the data received at a second conference terminal, the method comprising:
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calculating a new value for a first parameter by adding a weighted first fraction of a last value of the first parameter and a weighted second fraction of the current packet loss, wherein the first fraction is higher than said second fraction, if the current packet loss is lower than a predefined first threshold, then calculating a new value for a second parameter by adding a weighted fraction of a last value of said second parameter and a weighted fraction of the current packet loss, wherein the last value is weighted higher than the current packet loss, if the first parameter is higher than a predefined second threshold, then reducing the flow rate of data transmitted from the first conference device with a third fraction of the amount of the current packet loss, if the second parameter is higher than a predefined third threshold, then reducing the flow rate of data transmitted from the first conference device with a fourth fraction of the current packet loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification