QUALITY OF EXPERIENCE DETERMINATION FOR MULTI-PARTY VOIP CONFERENCE CALLS THAT ACCOUNT FOR FOCUS DEGRADATION EFFECTS

• US 20150156324A1
• Filed: 05/29/2014
• Published: 06/04/2015
• Est. Priority Date: 12/04/2013
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: O'SULLIVAN, PATRICK, ASSEM, HAYTHAM, DUNNE, JONATHAN, GALVIN, JAMES P.
• Granted Patent: US 9,232,049 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04M 3/2227 Quality of service monitoring
• CPC Class Codes: H04M 3/56 Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities video conference systems H04N7/15
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

In one embodiment, the quality of experience for a multi-part conference call is determined. Values for network characteristics for a conference call between at least three parties is captured using a multi-party conference call system. The network characteristics encompasses at least parameters expressed in an E-Model R-Factor equation. A quality of experience (QoE) is determined that accounts for degradation effects. The determined QoE is represented as a corrected mean opinion score (MOS) perceived by the receiving party. A controllable parameter of the conference call is dynamically and automatically modified to positively affect the determined QoE of the receiving party when the QoS is below a designated minimal QoE threshold.

Claims

1. A method for determining the quality of experience for a multi-party conference call comprising:

capturing values for a plurality of network characteristics for a conference call between at least three parties made using a multi-party conference call system in at least one of real-time and near real-time, wherein said plurality of network characteristics encompass at least parameters expressed in an E-Model R-Factor equation, wherein said multi-party conference call system utilizes a centralized focus component through which signals comprising the conference call are received from and sent to the at least three parties participating in the conference call, wherein the multi-party conference call system utilizes a Voice over Internet Protocol (VoIP);

determining a quality of experience (QoE) that accounts for degradation effects of the centralized focus component for each party of the at least three parties that is currently receiving a signal from the centralized focus component as part of the conference call, wherein the determined QoE is represented as a corrected mean opinion score (MOS) perceived by the receiving party; and

when the determined QoE of the conference call for the receiving party is below a predetermined threshold value, automatically and dynamically modifying a controllable parameter of the conference call to positively affect the determined QoE of the receiving party.

2. The method of claim 1, wherein determining the QoE further comprises:

calculating a MOS for each receiving party using the captured network characteristics values using the R-Factor equation of the E-Model, wherein the degradation effects of the centralized focus component are unrepresented in said R-Factor equation; and

calculating the corrected MOS for each receiving party using a correction function, wherein the correction function utilizes, as inputs, the MOS calculated using the R-Factor formula and a set of predetermined focus-effect coefficients for a codec being used for the receiving party.

3. The method of claim 2, wherein the correction function is expressed as

MOS_C=x1*MOS³+x2*MOS²+x3*MOS+x4,

wherein MOS_C is the corrected MOS, x1, x2, x3, and x4 correspond to the set of predetermined focus-effect coefficients for the codec used for each receiving party, and MOS corresponds to the MOS calculated using the R-Factor equation.

4. The method of claim 3, wherein calculating the corrected MOS further comprises:

identifying the codec being used by the multi-party conference call system for each receiving party; and

obtaining the set of predetermined focus-effect coefficients for the identified codec from a focus-effect coefficient table, said table containing the set of predetermined focus-effect coefficients for a plurality of codecs.

5. The method of claim 3, wherein the codec being used for the receiving party is one of G.711, Internet Low-Bitrate Codec (ILBC), and SILK.

6. The method of claim 1, wherein the controllable parameter of the conference call includes the codec being used for a receiving party, said modification of the controllable parameter further comprises:

performing the determination of the QoE for at least one other codec supported by the multi-party conference call system using the values of the plurality of network characteristics used in the determination of the QoE for the codec currently being used for the receiving party;

comparing the QoE of the codec currently being used to the QoE of the at least one other codec; and

when the QoE of one of the at least one other codec is deemed better than the QoE of the codec currently being used, proposing a switch from the codec currently being used for the receiving party to the at least one other codec having the better QoE as the modification to the controllable parameter.

7. The method of claim 1, wherein the degradation effects comprise a Focus-Transcoding Effect (FTE) and a Focus-Forwarding Effect (FFE).

8. The method of claim 1, wherein the determining step is performed by an improved QoE manager component of the multi-party conference call system, wherein said improved QoE manager is a replacement to an existing QoE handling component or an additional component that operates in conjunction with the existing QoE handling component.