HANDLING USER PLANE CONGESTION IN A WIRELESS COMMUNICATION NETWORK

• US 20130201824A1
• Filed: 07/31/2012
• Published: 08/08/2013
• Est. Priority Date: 02/06/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Venkatachalam, Muthaiah, Jain, Puneet, Siow, Eric
• Granted Patent: US 9,071,999 B2
• Time in Patent Office: Days
• US Class Current: 370/230
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 47/122 by diverting traffic away from congested entities
• CPC Class Codes: H04L 47/26 using explicit feedback to the source, e.g. choke packets
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/0215 based on user or device properties, e.g. MTC-capable devices services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/12 using signalling between network elements
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 48/06 based on traffic conditions
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure
• CPC Class Codes: H04W 76/36 for reassigning the resources associated with the released connections
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

Embodiments of the present disclosure describe devices, methods, computer-readable media and systems configurations for handling user plane congestion in a wireless communications network. A packet data network gateway (PGW) and/or a serving gateway (SGW) may proactively transmit a congestion notification to a mobility management entity (MME) including a level of congestion of the PGW and/or SGW. The MME may receive congestion notifications from a plurality of PGWs and/or SGWs. The MME may receive a request for a packet data network (PDN) connection from a user equipment (UE), and may take an action in response to the request based on the reported levels of congestion. The action may include selecting a PGW and/or SGW for the PDN connection, notifying the UE that the PDN connection cannot be established, and/or negotiating with the UE to terminate or modify one or more existing PDN connections in exchange for establishing the new PDN connection.

Claims

1. A mobility management entity (MME) comprising:

a communications module configured to communicate with a plurality of serving gateways (SGWs) and a plurality of packet data network gateways (PGWs) of an evolved packet core for a wireless communications network; and

a management module coupled to the communications module and configured to;

receive, via the communications module, a proactive PGW congestion notification from individual PGWs of the plurality of PGWs indicating a level of congestion for respective PGWs; and

manage access to the PGWs by a user equipment of the wireless communications network based on the received proactive PGW congestion notifications.

2. The MME of claim 1, wherein the management module is further configured to receive a proactive SGW congestion notification from individual SGWs of the plurality of SGWs indicating a level of congestion for respective SGWs.

3. The MME of claim 2, wherein the management module is further configured to receive a packet data network (PDN) request from the UE to establish a PDN connection with one of the plurality of PGWs, and to take an action in response to the request based on the levels of congestion of the plurality of PGWs.

4. The MME of claim 3, wherein the action includes selecting a first PGW of the plurality of PGWs for the UE to establish the PDN connection with based on the received levels of congestion for the plurality of PGWs.

5. The MME of claim 4, wherein the action further includes selecting a first SGW of the plurality of SGWs through which to route the PDN connection between the UE and the PGW, the first SGW selected based on the received levels of congestion for the plurality of SGWs.

6. The MME of claim 4, wherein the PGW is associated with a first SGW of the plurality of SGWs, and the management module is further configured to route the PDN connection through the first SGW.

7. The MME of claim 3, wherein the action includes sending a notification to the UE that the PDN connection was unsuccessful if there are no PGWs having a low congestion level.

8. The MME of claim 3, wherein the action includes negotiating with the UE to terminate or modify an existing PDN connection in exchange for establishing the requested PDN connection.

9. The MME of claim 8, wherein the negotiating includes:

transmitting a notification to the UE with an option to terminate or modify an existing PDN connection in exchange for establishing the requested PDN connection; and

receiving a response to the notification from the UE.

10. The MME of claim 9, wherein the notification and the response are transmitted via non access stratum (NAS) signaling.

11. The MME of claim 2, wherein the management module is further configured to proactively transmit a message to the UE indicating an overall congestion level of a user plane of the wireless communications network based on the received levels of congestion for the plurality of PGWs and/or SGWs.

12. The MME of claim 1, wherein the management module is configured to proactively transmit to the UE a notification to indicate high network congestion based on the levels of congestion of the PGWs.

13. The MME of claim 1, wherein the level of congestion is a high level indicating congestion is above a first threshold or a low level indicating congestion is below a second threshold.

14. The MME of claim 1, wherein the level of congestion is one of a plurality of levels indicating high congestion or one of a plurality of levels indicating low congestion.

15. An apparatus comprising:

a communications module configured to communicate with an evolved Node B (eNB) over a wireless communications network; and

a packet data network (PDN) module configured to;

transmit, to a mobility management entity (MME) of the wireless communications network, a request for a new PDN connection;

receive, from the MME, a notification giving the UE an option to terminate or modify an existing PDN connection in exchange for establishing the new PDN connection; and

send a response to the notification to the MME.

16. The apparatus of claim 15, wherein the request for the new PDN connection is transmitted to the MME via the eNB.

17. The apparatus of claim 16, wherein the notification is received from the MME via non access stratum (NAS) signaling.

18. The apparatus of claim 15, wherein the PDN module is further configured to present the option to a user of the apparatus to choose the response.

19. The apparatus of claim 15, wherein the option to modify the existing PDN connection includes reducing a bandwidth and/or a quality of service required by the existing PDN connection.

20. The apparatus of claim 15, wherein the response is a negative response, the new PDN connection is denied, and the apparatus continues to receive the existing PDN connection.

21. The apparatus of claim 15, wherein the response is a positive response, the new PDN connection is established, and the existing PDN connection is terminated or modified.

22. The apparatus of claim 15, wherein the communications module and PDN module are included in a user equipment (UE).

23. The apparatus of claim 22, wherein the UE further includes:

one or more antennas coupled with the communications module; and

a display coupled with the PDN module.

24. A packet data network gateway (PGW), comprising:

a communications module configured to communicate with a mobility management entity (MME); and

a congestion module configured to;

determine a level of congestion of the PGW; and

proactively report the level of congestion to the MME.

25. The PGW of claim 24, wherein the level of congestion is a high level indicating congestion is above a first threshold or a low level indicating congestion is below a second threshold.

26. The PGW of claim 25, wherein the level of congestion is one of a plurality of levels indicating high congestion or one of a plurality of levels indicating low congestion.

27. The PGW of claim 24, wherein the PGW is included in a communications apparatus, the communications apparatus further including a serving gateway (SGW) comprising:

an SGW communications module configured to communicate with the MME and the PGW; and

an SGW congestion module configured to;

determine a level of congestion of the SGW; and

proactively report the level of congestion to the MME.

28. One or more non-transitory computer-readable media having instructions, stored thereon, that, when executed cause a computing system to:

receive proactive packet data network gateway (PGW) congestion notifications from a plurality of PGWs indicating a level of congestion for the respective PGWs;

receive proactive serving gateway (SGW) congestion notification from a plurality of SGWs indicating a level of congestion for the respective SGWs;

receive a packet data network (PDN) request from a user equipment (UE) to establish a PDN connection with one of the plurality of PGWs; and

take an action in response to the PDN request based on the levels of congestion of the plurality of PGWs and SGWs.

29. The one or more computer-readable media of claim 28, wherein the action includes selecting a first PGW of the plurality of PGWs through which to establish the PDN connection, sending a notification to the UE that the PDN connection was unsuccessful, or negotiating with the UE to terminate or modify an existing PDN connection in exchange for establishing the requested PDN connection.

30. The one or more computer-readable media of claim 29, wherein the negotiating includes:

transmitting a notification to the UE with an option to terminate or modify an existing PDN connection in exchange for establishing the requested PDN connection; and

receiving a response to the notification from the UE.