METHOD AND APPARATUS FOR DETERMINING WHEN TO HANDOVER COMMUNICATIONS FROM A FIRST TO A SECOND ACCESS NETWORK

• US 20150172986A1
• Filed: 01/10/2014
• Published: 06/18/2015
• Est. Priority Date: 12/17/2013
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Salkintzis, Apostolis K.
• Granted Patent: US 9,326,208 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/22 for handling the traffic
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/36 by user or terminal equipment

Abstract

A wireless communication device performs a method for determining when to trigger a handover of a communication session from a first access network to a second access network. The method includes determining, for an active communication session, a set of outgoing traffic statistics for outgoing traffic sent by the wireless communication device using the first access network and determining, for the active communication session, a set of incoming traffic statistics for incoming traffic received by the wireless communication device using the first access network. The method further includes analyzing the incoming and outgoing traffic statistics and determining when to trigger a handover of the active communication session from the first access network to the second access network based on the analysis of the incoming and outgoing traffic statistics.

Claims

1. A method performed by a wireless communication device for determining when to trigger a handover of a communication session from a first access network to a second access network, the method comprising:

determining, for an active communication session, a set of outgoing traffic statistics for outgoing traffic sent by the wireless communication device using the first access network;

determining, for the active communication session, a set of incoming traffic statistics for incoming traffic received by the wireless communication device using the first access network;

analyzing the incoming and outgoing traffic statistics;

determining when to trigger a handover of the active communication session from the first access network to the second access network based on the analysis of the incoming and outgoing traffic statistics.

2. The method of claim 1, wherein determining when to trigger the handover based on the analysis of the incoming and outgoing traffic statistics comprises:

determining a difference between the incoming and outgoing traffic statistics;

comparing the difference to a traffic difference threshold to determine when to trigger the handover.

3. The method of claim 1 further comprising:

determining a signal strength associated with the received incoming traffic, wherein determining when to trigger the handover of the communication session from the first access network to the second access network is further based on comparing the signal strength to a signal strength threshold.

4. The method of claim 3 further comprising determining to trigger the handover when both the traffic difference threshold and the first signal strength threshold are satisfied.

5. The method of claim 4 wherein:

the traffic difference threshold is satisfied when the difference between the incoming and outgoing traffic statistics exceeds the traffic difference threshold; and

the first signal strength threshold is satisfied when the signal strength falls below the first signal strength threshold.

6. The method of claim 3, wherein the first signal strength threshold used to determine when to handover the active communication session based on both the analysis of the incoming and outgoing traffic statistics and the signal strength is larger than a second signal strength threshold used for determining when to perform a handover based only on signal strength.

7. The method of claim 1 further comprising detecting a type of active communication session based on the set of outgoing traffic statistics.

8. The method of claim 7, wherein determining the set of incoming traffic statistics, analyzing the incoming and outgoing traffic statistics, and determining when to trigger the handover of the active communication session based on the analysis of the incoming and outgoing traffic statistics is performed only when the type of the active communication session is a first type of active communication session.

9. The method of claim 8, wherein the first type of communication session comprises at least one of a voice call or a video session.

10. The method of claim 1, where the sets of outgoing and incoming traffic statistics comprises at least one of:

packet rate;

packet size;

length of silence periods;

frequency of silent periods;

length of burst periods;

frequency of burst periods.

11. The method of claim 1, wherein analyzing the incoming and outgoing traffic statistics comprises comparing the incoming traffic statistics to expected traffic statistics, which are derived from the outgoing traffic statistics.

12. The method of claim 1, wherein determining when to trigger the handover of the active communication session from the first access network to the second access network comprises determining when to trigger the handover from a Wireless Local Area Network to a cellular network.

13. A wireless communication device configured to determine when to trigger a handover of a communication session from a first access network to a second access network, the wireless communication device comprising:

a first wireless transceiver configured to transmit outgoing traffic and to receive incoming traffic communicated, using the first access network, during an active communication session;

a traffic analysis module coupled to the first wireless transceiver and configured to;

determine, for the active communication session, a set of outgoing traffic statistics for the outgoing traffic;

determine, for the active communication session, a set of incoming traffic statistics for the incoming traffic;

analyze the incoming and outgoing traffic statistics;

determine when to trigger a handover of the active communication session from the first access network to the second access network based on the analysis of the incoming and outgoing traffic statistics.

14. The wireless communication device of claim 13, wherein the traffic analysis module is further configured to:

analyze the incoming and outgoing traffic statistics by determining a difference between the incoming and outgoing traffic statistics and comparing the difference to a traffic difference threshold;

determine a signal strength associated with the received traffic and compare the signal strength to a signal strength threshold;

determine to trigger the handover when the difference between the incoming and outgoing traffic statistics exceeds the traffic difference threshold and the signal strength falls below the signal strength threshold.

15. The wireless communication device of claim 13 further comprising a memory component configured with a protocol stack that comprises:

an application layer that includes at least one application;

a Transport Control Protocol/Internet Protocol stack in communication with the application layer;

a communication stack that includes a link layer protocol and a physical layer protocol, wherein the communication stack is in communication with the Transport Control Protocol/Internet Protocol stack; and

a traffic analysis layer having a traffic analysis protocol that is executable by the traffic analysis module to control functionality of the traffic analysis module, wherein the traffic analysis layer is one of;

coupled to the Transport Control Protocol/Internet Protocol stack;

included within the Transport Control Protocol/Internet Protocol stack or included within the communication stack.

16. The wireless communication device of claim 13 further comprising a second wireless transceiver coupled to the traffic analysis module, wherein the second wireless transceiver is configured to transmit outgoing traffic and to receive incoming traffic communicated using the second access network, wherein the first and second wireless transceivers are configured for alternate operation to support wireless communications over the first and second access networks.

17. The wireless communication device of claim 13, wherein the traffic analysis module is further configured to:

determine a type of active communication session based on the set of outgoing traffic statistics; and

only when the type of the active communication is a first type of communication session, proceed to determine the set of incoming traffic statistics, analyze the incoming and outgoing traffic statistics, and determine when to trigger the handover of the active communication session based on the analysis of the incoming and outgoing traffic statistics.

18. A method performed by a wireless communication device for determining when to trigger a handover of a communication session from a first access network to a second access network, the method comprising:

determining, for an active communication session, a set of outgoing traffic statistics for outgoing traffic sent by the wireless communication device using the first access network;

determining and analyzing a signal strength associated with the received incoming traffic;

determining, for the active communication session, a set of incoming traffic statistics for incoming traffic received by the wireless communication device using the first access network;

analyzing the incoming and outgoing traffic statistics; and

determining when to trigger a handover of the active communication session from the first access network to the second access network based on the analysis of the incoming and outgoing traffic statistics and based on the analysis of the signal strength.

19. The method of claim 18, wherein analyzing the incoming and outgoing traffic statistics comprises determining a difference between the incoming and outgoing traffic statistics, and comparing the difference to a traffic difference threshold, and analyzing the signal strength comprises comparing the signal strength to a signal strength threshold, the method further comprising:

determining to trigger the handover when the difference between the incoming and outgoing traffic statistics exceeds the traffic difference threshold and the signal strength falls below the signal strength threshold.

20. The method of claim 18 further comprising:

determining a type of active communication session based on the set of outgoing traffic statistics, and only when the type of the active communication is a first type of communication session, determining the set of incoming traffic statistics, analyzing the incoming and outgoing traffic statistics, and determining when to trigger the handover of the active communication session based on the analysis of the incoming and outgoing traffic statistics and the analysis of the signal strength;

otherwise determining when to trigger the handover of the active communication based only on the analysis of the signal strength and without the analysis of the incoming and outgoing traffic statistics when the type of the active communication is not the first type of communication session.