# US 12,764,592 B2 · System for low latency, low loss, and scalable throughput (L4S) traffic mapping

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- Number: US 12,764,592 B2
- Document ID: US12764592B2
- Status: Granted
- Kind: B2
- Application number: 18/595,219
- Filed: 2024-03-04
- Published: 2025-06-19
- Granted: 2026-10-13
- Earliest claimed: 2023-12-19
- Assignees: Cisco Technology, Inc.
- Applicants: Cisco Technology, Inc.
- Inventors: Jerome Henry; Binita Gupta; Juan Carlos Zuniga
- Web page: https://patentgrep.com/patent/US12764592B2

## CPC

- H04W 28/0236: {radio quality, e.g. interference, losses or delay}
- H04L 47/20: Traffic policing
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Devices, networks, systems, methods, and processes for detecting and mapping Low Latency, Low Loss, and Scalable throughput (LAS) traffic are described herein. A device may determine that a data flow is LAS. The device can determine an initial Quality of Service (QoS) value associated with the data flow. The device may determine one or more network policies associated with one or more QoS levels. The device can determine a QoS ceiling value associated with a highest QoS level of the one or more QoS levels. The device may mark the data flow with the QoS ceiling value if the initial QoS value is lower than the QoS ceiling value, thereby mapping the data flow to the highest QoS level. The device can also maintain the initial QoS value if the initial QoS value is greater than the QoS ceiling value, as an exception to the one or more network policies.

## Claims

### Claim 1

A device, comprising:
a processor;
a memory communicatively coupled to the processor; and
a traffic mapping logic, configured to:
receive a data flow including at least one data packet;
determine that the data flow is a Low Latency, Low Loss, Scalable throughput (L4S) data flow;
identify an initial Quality of Service (QoS) value in at least one initial header of the at least one data packet;
determine one or more network policies associated with the LAS data flow;
map one of the at least one data packet based on the initial QoS value and the one or more network policies;
determine a DSCP ceiling value associated with a highest QoS level; and
assign the DSCP ceiling value to the data flow.

### Claim 2 (depends on 1)

The device of claim 1, wherein mapping each of the at least one data packet comprises:
determining a maximum QoS value associated with the one or more network policies;
comparing the initial QoS value with the maximum QoS value;
generating at least one encapsulated data packet including at least one outer header based on a result of the comparison; and
mapping the data flow to at least one of: a User Priority (UP) value or an Access Category (AC) value based on a result of the comparison.

### Claim 3 (depends on 2)

The device of claim 2, wherein the at least one outer header is indicative of the initial QoS value if the initial QoS value is greater than or equal to the maximum QoS value.

### Claim 4 (depends on 2)

The device of claim 2, wherein the at least one outer header is indicative of the maximum QoS value if the initial QoS value is less than the maximum QoS value.

### Claim 5 (depends on 2)

The device of claim 2, wherein the traffic mapping logic is further configured to replace the initial QoS value in the at least one initial header with the maximum QoS value if the initial QoS value is less than the maximum QoS value.

### Claim 6 (depends on 2)

The device of claim 2, wherein the initial QoS value and the maximum QoS value are indicative of an initial Differentiated Services Code Point (DSCP) value and a maximum DSCP value respectively.

### Claim 7 (depends on 6)

The device of claim 6, wherein the UP value or the AC value is indicative of one or more of: AC Voice (AC_VO), AC Video (AC_VI) or AC Best Effort (AC_BE).

### Claim 8 (depends on 2)

The device of claim 2, wherein determining that the data flow is the LAS data flow comprises:
detecting an L4S indicator in the at least one data packet; and
determining that the data flow is the L4S data flow based on the L4S indicator.

### Claim 9 (depends on 8)

The device of claim 8, wherein the L4S indicator includes an Explicit Congestion Notification (ECN) indicator.

### Claim 10 (depends on 8)

The device of claim 8, wherein the traffic mapping logic is further configured to enqueue the L4S data flow into an LAS queue.

### Claim 11

A device, comprising:
a processor;
a memory communicatively coupled to the processor; and
a traffic mapping logic, configured to:
receive a data flow;
determine that the data flow is a Low Latency, Low Loss, Scalable throughput (L4S) data flow;
identify a highest Quality of Service (QoS) level if the data flow is the L4S data flow;
map the L4S data flow to a highest QoS level;
determine a DSCP ceiling value associated with a highest QoS level; and
assign the DSCP ceiling value to the data flow.

### Claim 12 (depends on 11)

The device of claim 11, wherein the traffic mapping logic is further configured to enqueue the L4S data flow into a queue associated with a highest QoS level.

### Claim 13 (depends on 11)

The device of claim 11, wherein determining that the data flow is the L4S data flow comprises:
receiving at least one data packet of the data flow;
detecting an LAS indicator in the at least one data packet; and
determining that the data flow is the L4S data flow based on the L4S indicator.

### Claim 14 (depends on 13)

The device of claim 13, wherein the traffic mapping logic is further configured to generate at least one encapsulated data packet including at least one outer header indicative of a highest QoS level.

### Claim 15 (depends on 13)

The device of claim 13, wherein the L4S indicator includes an Explicit Congestion Notification (ECN) indicator.

### Claim 16 (depends on 13)

The device of claim 13, wherein the data flow is an upstream data flow received from a wireless device.

### Claim 17 (depends on 16)

The device of claim 16, wherein the traffic mapping logic is further configured to transmit, to the wireless device, a Stream Classification Service (SCS) signal indicative of marking the upstream data flow with a highest QoS level.

### Claim 18

A method, comprising:
receiving a data flow including at least one data packet;
determining that the data flow is a Low Latency, Low Loss, Scalable throughput (LAS) data flow;
identifying an initial Quality of Service (QoS) value in at least one initial header of the at least one data packet;
determining one or more network policies associated with the L4S data flow;
determining a maximum QoS value associated with the one or more network policies;
generating at least one encapsulated data packet including at least one outer header based on the initial QoS value and the maximum QoS value;
determining a DSCP ceiling value associated with a highest QoS level; and
assigning the DSCP ceiling value to the data flow.

### Claim 19 (depends on 18)

The method of claim 18, wherein the at least one outer header is indicative of the initial QoS value if the initial QoS value is greater than or equal to the maximum QoS value.

### Claim 20 (depends on 18)

The method of claim 18, wherein the at least one outer header is indicative of the maximum QoS value if the initial QoS value is less than the maximum QoS value.