Methods and Apparatus for Detecting and Indicating Uplink (UL) and/or Downlink (DL) Congestion at a Core Network Interface Function

Abstract: methods and apparatus for providing l4s support with regard to non-3gpp untrusted/trusted accesses in which a core network interface device, e.g., n3iwf or a tngf, is used are described. the core network interface device monitors for downlink and/or uplink congestion with regard to l4s downlink and/or uplink data traffic flows, detects congestion and perform explicit congestion notification (ecn) markings or communicates congestion information used in performing ecn marking to another device. in some embodiments, the core network interface device indicates detected congestion, at the core network interface device, in a dl traffic flow via performing ecn marking of the innermost ip header ecn field. in some other embodiments, the core network interface device communicates detected congestion information to other devices. sometimes the congestion information is communicated via a gtp-u header to a upf, which performs ecn marking based on the received non-3gpp congestion information.

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

CPC Classification: H04L47/11 (Identifying congestion)

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