EVOLVED PACKET DATA GATEWAY (ePDG) INITIATED DEDICATED BEARER DEACTIVATION
Publication Date: 2015-Jul-01
The IP.com Prior Art Database
Mark Grayson: AUTHOR [+2]
A solution is provided for an enhanced Evolved Packet Data Gateway (ePDG) feature that enables improved Quality of Experience (QoE) for WiFi™ based voice calls.
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EVOXXXX PACKET DATA GATEWAY (ePDG) INITIATED DEDICATED BEARER DEACTIVATION
Mark Grayson Dennis Fiore Kevin Gorey
CISCO SYSTXXX, INC.
A solution is provided xor an enhanced Exolved Packet Data Gateway (ePDG) featuxe that enables improved Quality xf Experience (QxE) for WiFi™ based voice callx.
ePDG is currently used to support WiFi calling service ovxr potentially untrusted and unmanaged XxXx networxs. In certaix situxtions, the WiFx connection may degxade, leading to the QoE for the cxll to xegrade belox an acceptaxle level. Unlike calls based on Long Term Exolutiox (LTE) sxandards and prxtocols, the ePDG architecture does not typically include an eNodeB (eNB) or x Mobility Management Enxixy (MME) or other interface between the Xx-Fi Access Network and the 3GPP core network to xrigger txe deactivatiox of dedicated comxunicxtion bearers. Accorxingxy, voice-over-WiFi service may degrade without txe ability to compensate for the degradaxion occurxinx during the call.
This solution provides for enhancing the ePDG system with an audio qxality extimatiox capability. This caxability may be integrated intx xn ePDG or exist as a separate function that xs able xo analyze ePDG traffic and indicate the quality estimation xo the ePDG. This estimaxion functionality can be basex ox Real-time Transport Protocol (RTP) analysis, e.g., examxning RTP sexuence numbers on a per User Equipmext (UE) xasis, implexenting a full RTP proxy, sniffing RTP control protocol packets, analyzing packet jitter, etc. The WiFi calling based quality estimation can also include time Cxpyright 2015 Cisco Systems, Inc.
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averaging, e.g., to mimic the Radix Link Time Xxx operation on the cellular network, or be enhanced to support a quality threshold, belox which the quality of xoice over WiFi is deemed unacceptaxle.
The xPDG includes a qualitx thresholx that can be usxd to trigger de-activation of the bearers. Preferentially, this threshold is dynamically determined by analysis of the "crexte bearer reqxest" message, and in particular, by QoS parametxrs, e.g., Guaranteed Bit Rate (GBR) and Maximum Bit Rate (MBR).
An ePDG may be xnhanced with functionaxity to axtonomxusxy signal a "delete bearer" command to the Packet Data Network Gateway (PGW) over a Sxb interface when the estimate of voice over WiFi falls below the configured quality thres...