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Content for  TS 23.334  Word version:  18.1.0

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6.2.13 Explicit Congestion Notification support  6.2.13.1 General  6.2.13.2 ECN Active Indicated (ECN transparent)  6.2.13.3 ECN support requested (ECN endpoint)  6.2.13.4 ECN Failure Indication (ECN endpoint) 
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6.2.13  Explicit Congestion Notification support |R10|  p. 137

6.2.13.1  General  p. 137

An IMS-ALG may configure the IMS-AGW to transfer the ECN bits in the IP header transparent (see clause 6.2.13.2) or to act as an ECN endpoint (see clause 6.2.13.3). See clause 5.12.

6.2.13.2  ECN Active Indicated (ECN transparent)  p. 137

Figure 6.2.13.2.1 shows the message sequence chart example for indicating ECN transparent.
Copy of original 3GPP image for 3GPP TS 23.334, Fig. 6.2.13.2.1: Procedure to indicate ECN transparent negotiated
Figure 6.2.13.2.1: Procedure to indicate ECN transparent negotiated
(⇒ copy of original 3GPP image)
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Upon receipt of the indication that ECN transparent has been negotiated, the IMS-AGW shall forward ECN bits within IP packets unmodified. Any RTCP feedback received shall be passed unchanged.

6.2.13.3  ECN support requested (ECN endpoint)  p. 138

Figure 6.2.13.3.1 shows the message sequence chart example for requesting ECN endpoint.
Copy of original 3GPP image for 3GPP TS 23.334, Fig. 6.2.13.3.1: Procedure to Request ECN endpoint
Figure 6.2.13.3.1: Procedure to Request ECN endpoint
(⇒ copy of original 3GPP image)
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Upon receipt of a request to apply ECN the IMS-AGW shall set the ECN field of the IP header in accordance with TS 26.114 when sending any data packets.
Upon receipt of any IP headers indicating ECN Congestion Experienced (ECN-CE) the IMS-AGW shall trigger rate adaptation in accordance with TS 26.114.
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6.2.13.4  ECN Failure Indication (ECN endpoint)  p. 138

Figure 6.2.13.4.1 shows the message sequence chart example for an ECN Failure Event.
Copy of original 3GPP image for 3GPP TS 23.334, Fig. 6.2.13.4.1: Procedure to Report ECN Failure
Figure 6.2.13.4.1: Procedure to Report ECN Failure
(⇒ copy of original 3GPP image)
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When the IMS-ALG receives a Notification indicating that a failure has occurred, the IMS-ALG may trigger a new SDP offer to disable ECN.

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