Systems and Methods of QoS for Single Stream ICA

• US 20120230345A1
• Filed: 03/06/2012
• Published: 09/13/2012
• Est. Priority Date: 03/11/2011
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: OVSIANNIKOV, MICHAEL
• Granted Patent: US 9,237,106 B2
• Time in Patent Office: Days
• US Class Current: 370/412
• CPC Class Codes: H04L 47/193 at the transport layer, e.g. TCP related
• CPC Class Codes: H04L 47/22 Traffic shaping
• CPC Class Codes: H04L 47/24 Traffic characterised by specific attributes, e.g. priority or QoS
• CPC Class Codes: H04L 47/2441 relying on flow classification, e.g. using integrated services [IntServ]
• CPC Class Codes: H04L 47/41 by acting on aggregated flows or links
• CPC Class Codes: H04L 47/6215 Individual queue per QOS, rate or priority
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

The present solution provides quality of service (QoS) for a stream of protocol data units via a single transport layer connection. A device receives via a single transport layer connection a plurality of packets carrying a plurality of protocol data units. Each protocol data unit identifies a priority. The device may include a filter for determining an average priority for a predetermined window of protocol data units and an engine for assigning the average priority as a connection priority of the single transport layer connection. The device transmits via the single transport layer connection the packets carrying those protocol data units within the predetermined window of protocol data units while the connection priority of the single transport layer connection is assigned the average priority for the predetermined window of protocol data units.

Claims

1. A method for providing quality of service (QoS) for a stream of protocol data units via a single transport layer connection, the method comprising:

(a) receiving, by a device via a single transport layer connection, a plurality of packets carrying a plurality of protocol data units, each protocol data unit of the plurality of protocol data units identifying a priority, at least one or more of the plurality of protocol data units comprising a first priority different than a second priority of other protocol data units of the plurality of protocol data units;

(b) determining, by the device, an average priority for a predetermined window of protocol data units of the plurality of protocol data units;

(c) assigning, by the device, the average priority as a connection priority of the single transport layer connection; and

(d) transmitting, by the device via the single transport layer connection, the plurality of packets carrying those protocol data units within the predetermined window of protocol data units while the connection priority of the single transport layer connection is assigned the average priority for the predetermined window of protocol data units.

2. The method of claim 1, wherein step (a) further comprises receiving, by the device via the single transport layer connection the plurality of packets carrying the plurality of protocol data units of a remote display protocol, each protocol data unit corresponding to a virtual channel, the virtual channel assigned the priority.

3. The method of claim 1, wherein step (a) further comprises buffering, by the device, the plurality of packets until the connection priority for the plurality of packets is assigned to the transport layer connection.

4. The method of claim 1, wherein step (b) further comprises determining, by a filter of the device, the average priority based on finite impulse response (FIR) filtering.

5. The method of claim 1, wherein step (b) further comprises determining, by a filter of the device, the average priority based on infinite impulse response (IIR) filtering.

6. The method of claim 1, wherein step (b) further comprise identifying, by the device, the predetermined window as comprising a predetermined number of protocol data units.

7. The method of claim 1, wherein step (c) further comprises setting, by the device, a Differentiated Services Code Point (DSCP) field in the plurality of packets to correspond to the connection priority assigned to the single transport layer connection.

8. The method of claim 1, wherein step (d) further comprising transmitting, by the device, a first packet of the plurality of data packets with the connection priority identified via one of an internet protocol (IP layer) or transport layer and the first packet carrying a first protocol data unit having the priority identified via a protocol above the transport layer.

9. The method of claim 1, further comprising determining, by the device, a second average priority for a second predetermined window of protocol data units of a second plurality of protocol data units and assigning, by the device, the second average priority as the connection priority of the single transport layer connection.

10. The method of claim 9, further comprising transmitting, by the device via the single transport layer connection, a second plurality of packets carrying those protocol data units within the second predetermined window of protocol data units while the connection priority of the single transport layer connection is assigned the second average priority for the second predetermined window of protocol data units.

11. A system for providing quality of service (QoS) for a stream of protocol data units via a single transport layer connection, the system comprising:

a device intermediary to a sender and receiver that receives via a single transport layer connection a plurality of packets carrying a plurality of protocol data units, each protocol data unit of the plurality of protocol data units identifying a priority, at least one or more of the plurality of protocol data units comprising a first priority different than a second priority of other protocol data units of the plurality of protocol data units;

a filter of the device determining an average priority for a predetermined window of protocol data units of the plurality of protocol data units;

an engine of the device assigning the average priority as a connection priority of the single transport layer connection; and

wherein the device transmits via the single transport layer connection the plurality of packets carrying those protocol data units within the predetermined window of protocol data units while the connection priority of the single transport layer connection is assigned the average priority for the predetermined window of protocol data units.

12. The system of claim 11, wherein the device receives via the single transport layer connection the plurality of packets carrying the plurality of protocol data units of a remote display protocol, each protocol data unit corresponding to a virtual channel, the virtual channel assigned the priority.

13. The system of claim 11, wherein the engine buffers the plurality of packets until the connection priority for the plurality of packets is assigned to the transport layer connection.

14. The system of claim 11, wherein the filter determines the average priority based on finite impulse response (FIR) filtering.

15. The system of claim 11, wherein the filter determines the average priority based on infinite impulse response (IIR) filtering.

16. The system of claim 11, wherein engine identifies the predetermined window as comprising a predetermined number of protocol data units.

17. The system of claim 11, wherein the engine sets the Differentiated Services Code Point (DSCP) field in the plurality of packets to correspond to the connection priority assigned to the single transport layer connection.

18. The system of claim 11, wherein the device transmits a first packet of the plurality of data packets with the connection priority identified via one of an internet protocol (IP layer) or transport layer and the first packet carrying a first protocol data unit having the priority identified via a protocol above the transport layer.

19. The system of claim 11, wherein the filter determines a second average priority for a second predetermined window of protocol data units of a second plurality of protocol data units and the engine assigns the second average priority as the connection priority of the single transport layer connection.

20. The system of claim 19, wherein device transmits via the single transport layer connection, a second plurality of packets carrying those protocol data units within the second predetermined window of protocol data units while the connection priority of the single transport layer connection is assigned the second average priority for the second predetermined window of protocol data units.