Mobility management of wireless networks based on multipath transfer control protocol

Patent metadata

Field	Value
Publication number	US-9681481-B2
Application number	US-201414576630-A
Country	US
Kind code	B2
Filing date	Dec 19, 2014
Priority date	Dec 19, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

Mobile management in a cellular network utilizes the multipath-transfer control protocol (MP-TCP). A mobile device establishes a first multipath-transfer control protocol (MP-TCP) subflow to a corresponding node using a first internet protocol (IP) address corresponding to the mobile device. At least a portion of the first IP address is uniquely associated with the first coverage area. The mobile device establishes a second MP-TCP subflow using a second IP address corresponding to the mobile device while the mobile device is in an overlapped coverage area including a first portion of the first coverage area and a second portion of a second coverage area. At least a portion of the second IP address is uniquely associated with the second coverage area. The mobile node turns off the first subflow when the mobile node determines it has left the first coverage area.

First claim

What is claimed is:

1. A method for mobility management of a mobile device comprising:
the mobile device receiving over a first cell site control channel a first prefix sent by a first cell site equipment serving a first coverage area, the first prefix being sent independently of a first internet protocol (IP) address; and
the mobile device determining the first IP address based on the first prefix and an identifier associated with the mobile device;
establishing a first multipath-transfer control protocol (MP-TCP) subflow to a corresponding node from the mobile device in the first coverage area using the first IP address;
as the mobile device moves to a second coverage area served by a second cell site equipment, the mobile device receiving in an overlapped coverage area including a first portion of the first coverage area and a second portion of the second coverage area, a second prefix sent by the second cell site equipment over a second cell site control channel;
the mobile device determining a second IP address based on the second prefix and the identifier associated with the mobile device;
establishing a second MP-TCP subflow using the second IP address while the mobile device is in the overlapped coverage area; and
the mobile device making a determination to close the first MP-TCP subflow based on a signal strength of a transmission from the first cell site equipment being below a threshold.

2. The method as recited in claim 1 comprising maintaining the first MP-TCP subflow after the second MP-TCP subflow has been established while in the overlapped coverage area.

3. The method as recited in claim 1 ,
wherein the first prefix is unique to the first coverage area and the second prefix is unique to the second coverage area.

4. The method as recited in claim 1 , further comprising:
establishing the first and second MP-TCP subflows to the corresponding node through an MP-TCP proxy.

5. The method as recited in claim 1 ,
wherein the first MP-TCP subflow is established through the first cell site equipment; and
wherein the second MP-TCP subflow is established through the second cell site equipment.

6. The method as recited in claim 1 further comprising:
the mobile device entering a third coverage area of another radio access technology;
the mobile device receiving a third internet address assigned by an access point serving the third coverage area; and
the mobile device establishing a third subflow to the corresponding node using the other radio access technology.

7. The method as recited in claim 1 further comprising the first cell site equipment broadcasting the first prefix over the first cell site control channel.

8. The method as recited in claim 1 further comprising the second cell site equipment broadcasting the second prefix over the second cell site control channel.

9. The method as recited in claim 1 wherein the identifier associated with the mobile device is a media access control address associated with the mobile device.

10. A mobile device comprising:
multipath transfer control protocol (MP-TCP) processing logic responsive to a request for a TCP-IP connection to establish a first multipath-transfer control protocol (MP-TCP) subflow to a corresponding node using a first internet protocol (IP) address associated with a first cell site equipment while the mobile device is in a first coverage area served by the first cell site equipment,
wherein the mobile device is configured to form the first IP address using an identifier uniquely associated with the mobile device and a first prefix received by the mobile device over a first cell site control channel from the first cell site equipment, the first prefix being sent independently of the first IP address and corresponding to the first coverage area; and
the MP-TCP processing logic responsive to the mobile device being in an overlapped coverage area between the first coverage area served by the first cell site equipment and a second coverage area served by a second cell site equipment, to cause the mobile device to establish a second MP-TCP subflow using a second IP address;
wherein the mobile device is configured to form the second IP address using the identifier uniquely associated with the mobile device and a second prefix received by the mobile device over a second cell site control channel from the second cell site equipment, the second prefix being sent independently of the second IP address and corresponding to the second coverage area.

11. The mobile device as recited in claim 10 wherein the MP-TCP processing logic is responsive to a determination that a signal strength of a signal transmitted by the first cell site equipment is below a threshold to close the first MP-TCP subflow.

12. The mobile device as recited in claim 10 wherein the first IP address and second IP address are formed utilizing a media access control address of the mobile device as the identifier uniquely associated with the mobile device.

13. A non-transitory computer readable storage comprising computer-executable instructions that, in response to execution, cause a system comprising a processor to perform operations to:
form a first internet protocol (IP) address using an identifier uniquely associated with a mobile device on which the processor is disposed and a first prefix transmitted by a first cell site equipment serving a first coverage area over a first cell site control channel, the first prefix being sent independently of the first IP address and corresponding to the first coverage area;
establish a first multipath-transfer control protocol (MP-TCP) subflow to a corresponding node from the mobile device in the first coverage area using the first IP address;
form a second IP address using the identifier uniquely associated with the mobile device and a second prefix sent by a second cell site equipment serving a second coverage area over a second cell site control channel, the second prefix being sent independently of the second IP address and corresponding to the second coverage area;
establish a second MP-TCP subflow to the corresponding node using the second IP address in response to the mobile device moving to an overlapped coverage area between the first coverage area and the second coverage area; and
close the first MP-TCP subflow based on a signal strength of a transmission from the first cell site equipment being below a threshold.

Assignees

• At & T Ip I Lp

Inventors

• Liu Cheng
• Cui Zhi
• Fung Liza
• Pandey Vinod
• Smith Jr Paul E

Classifications

• H04W80/06

  Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless {(transmission control protocol/Internet protocol [TCP/IP] or user datagram protocol [UDP] H04L69/16)} · CPC title

• H04W36/0027

  for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections · CPC title

• H04W76/025 Primary

  Electricity · mapped topic

• H04W76/12

  Setup of transport tunnels · CPC title

• H04W76/15 Primary

  Setup of multiple wireless link connections · CPC title