Methods and Apparatus for Detecting and Indicating Downlink (DL) Congestion at a Non-3GPP Access Point

Abstract: methods and apparatus for providing l4s support with regard to non-3gpp untrusted/trusted accesses in which a non-3gpp access point, e.g., a wlan ap or a tnap, is enabled to monitor for downlink congestion with regard to l4s downlink data traffic flows at the non-3gpp ap, detect congestion and perform explicit congestion notification (ecn) markings are described. in some embodiments an innermost ip header field corresponding to a downlink l4s data packet, which typically conveys ecn information, in unavailable to the non-3gpp ap, due to ipsec encapsulation. the non-3gpp ap indicates detected congestion, at the non-3gpp ap, in an dl traffic flow via setting bits in an outer ip header ecn field. the ap detected dl congestion information is communicated via the outer ip header ecn field to a destination ue or to a core network interface device, e.g., a n3iwf or tngf.

Inventor(s): Paul L. Russell, JR., Yildirim Sahin, Imtiyaz Shaikh, Maulik Vaidya

CPC Classification: H04L43/0882 (Utilisation of link capacity)

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