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Ice based NAT traversal

A technology of P-CSCF and candidate addresses, which is applied to electrical components, transmission systems, etc., and can solve problems such as increasing delays

Inactive Publication Date: 2014-09-10
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is unavoidable that current NAT traversal mechanisms can cause increased or unnecessary delays due to the multimedia packets traversing the communication path between the first and second UEs 101 and 103
With the increased use of high-bandwidth multimedia applications, these delays will be unacceptable for time-sensitive real-time multimedia services such as multimedia streaming, voice and video conferencing applications

Method used

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Examples

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Embodiment Construction

[0059] Figure 1b with 1c A first scenario for NAT traversal is shown when the UE supports ICE and the IMS core network does not insert an IMS-AGW node in the media path. The ICE-based NAT traversal mechanism yields relay-based NAT traversal using a TURN server for those NAT traversal cases when a media relay node is the only component implementing NAT traversal or when other endpoints do not support the ICE mechanism. Figure 1d , 1e and If show a second scenario for NAT traversal when the IMS network detects a NAT device located between the UE and the IMS core network. In A) UE does not support ICE-based NAT traversal (for example, as Figure 1d with 1e shown) or B) UE supports ICE-based NAT traversal, but the IMS-AGW node is already in the media path (for example, as Figure 1f shown), then multiple IMS-AGW nodes are used as media relay nodes in the IMS network, which is usually used to avoid TURN-based NAT traversal.

[0060] To at least partially overcome the problems...

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Abstract

An Interactive Connectivity Establishment, ICE, based NAT traversal mechanism is described for use by originating / terminating P-CSCF nodes (114a / 114b) in an IMS network (105). The originating P-CSCF node (114a) receives a SIP INVITE request from first user equipment (UE) (101 ) originating a call towards a second UE (103). If a relay candidate address for the first UE (101) is not present in the SIP INVITE request, the SIP INVITE request is modified to include a first address provided by an originating IMS-AGW node (115a) as a relay candidate for the first UE (101) and forwarded to the second UE (103). The originating P-CSCF node (114a) receives a SIP INVITE response message from the second UE (103) in response to the SIP INVITE request. If a relay candidate address for the second UE (103) is not present in the SIP INVITE response, the SIP INVITE response is modified to include a second address provided by an originating IMS-AGW node (115a) as a relay candidate for the second UE (103) and forwarded to the first UE (101). The corresponding candidate address information is used by the both UEs (101, 103) in ICE procedures. If a relay server is required, then only the IMS-AGW node (115a) is deployed.

Description

technical field [0001] The present invention relates to a method and arrangement for session establishment between user equipment behind a network address translation (NAT) device in a communication network. More specifically, the present invention relates to a method and apparatus for establishing a multimedia session in a communication network including an Internet Protocol (IP) Multimedia Subsystem (IMS) when a user equipment is located behind a NAT device. Background technique [0002] Internet Protocol Multimedia (IPMM) services provide a dynamic combination of voice, video, messaging, data, etc. within the same call or media session (multimedia session). By increasing the number of basic applications and media that can be combined, the number of services provided to end users will increase and the experience of human-to-human communication will be enriched. This will lead to a new generation of personalized, rich multimedia communication services, including so-called ...

Claims

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Application Information

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IPC IPC(8): H04L29/12H04L45/741
CPCH04L61/2589H04L61/2575H04L65/1016H04L61/2528H04L65/1006H04L61/2564H04L65/1069H04L65/1104
Inventor S.布劳H.普兹拜茨
Owner TELEFON AB LM ERICSSON (PUBL)
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