IP Library Granted Patent US 8,681,638
Granted Patent B2
US 8,681,638 · App. 12/533,846 · Granted Mar 25, 2014

Wireless communication system

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Quick Facts
Patent No.
US 8,681,638
App. No.
12/533,846
Granted
Mar 25, 2014
Kind
B2
Abstract

A method of operating a communication system comprises exchanging initial communications between a wireless communication device and a communication network over a wireless connection between the wireless communication device and a network access system and over a network connection between the wireless device and the communication network. The method further comprises, in response to a loss of the network connection due to a deterioration of the wireless connection, determining if a partial network entry process is possible to regain the connection, and if the partial network entry process is possible to regain the network connection, performing the partial network entry process. The method further comprises, in response to an improvement of the wireless connection and upon regaining the network connection, exchanging new communications between the wireless communication device and the communication network over the wireless connection and the network connection.

Claims (37)

1. A method of operating a communication system, the method comprising:

exchanging initial communications between a wireless communication device and a communication network over a wireless connection between the wireless communication device and a network access system and over a network connection between the wireless device and the communication network;

discovering the network access system after a loss of the network connection due to a deterioration of the wireless connection between the wireless communication device and the network access system, wherein the wireless device checks a state of a context flag stored in memory after the loss of the network connection due to the deterioration of the wireless device;

determining at the wireless device a type of network entry process required to regain the network connection based on the context flag stored in memory, wherein the context flag is indicative of whether context information was maintained during the deterioration of the wireless connection between the wireless communication device and the network access system;

initiating at the wireless communication device a network entry process with the network access system based on the context flag to re-establish the network connection where the initiated network entry process is selected from a full network entry process, a partial network entry process, and a full network re-entry process, wherein all network entry steps are required to re-establish the network connection during the full network entry process, some network entry steps are required and some network entry steps are skipped to re-establish the network connection during the partial network entry process, and none of the network entry steps are required to re-establish the network connection during the full network re-entry process;

exchanging new communications between the wireless communication device and the communication network over the wireless connection and the network connection after the network connection is re-established.

2. The method of claim 1 , wherein the context flag indicates the full network entry process is required if the context information is not maintained, the context flag indicates the partial network entry process is possible if some of the context information is maintained, and the context flag indicates the full network re-entry process is possible when all of the context information is maintained.

3. The method of claim 2 further comprising establishing the wireless connection between the wireless communication device and the network access system, and performing a network entry process over the wireless connection to establish the network connection between the wireless communication device and the communication network before exchanging initial communications between the wireless communication device and the communication network.

4. The method of claim 3 wherein the network entry process further comprises determining which network entry steps are skipped when the network entry process is the partial network entry process.

5. The method of claim 1 wherein the deterioration of the wireless connection occurs due to a coverage hole encountered by the wireless communication device.

6. The method of claim 1 wherein the wireless connection comprises a layer one connection and wherein the network connection comprises a layer three connection.

7. The method of claim 1 wherein exchanging the initial communications comprises exchanging the initial communications in accordance with a wireless communication protocol.

8. The method of claim 7 wherein the wireless communication protocol comprises at least one of Worldwide Inter-operability for Microwave Access (WiMAX) and Long Term Evolution (LTE).

9. A communication system comprising:

a communication network;

a network access system in communication with the communication network and configured to provide access to the communication network; and,

a wireless communication device in communication with the network access system over a wireless connection and configured to:

perform a network entry process over the wireless connection to establish a network connection with the communication network;

exchange initial communications with the communication network over the wireless connection and the network connection;

discover the network access system after a loss of the network connection due to a deterioration of the wireless connection, wherein the wireless device checks a state of a context flag stored in memory after discovering the network access system;

determine a type of network entry process required to regain the connection based on the context flag stored in memory, wherein the context flag is indicative of whether context information was maintained during the deterioration of the wireless connection between the wireless communication device and the network access system;

initiate a network entry process with the network access system based on the context flag to re-establish the network connection where the initiated network entry process is selected from a full network entry process, a partial network entry process, and a full network re-entry process, wherein all network entry steps are required to re-establish the network connection during the full network entry process, some network entry steps are required and some network entry steps are skipped to re-establish the network connection during the partial network entry process, and none of the network entry steps are required to re-establish the network connection during the full network re-entry process;

exchange new communications with the communication network over the wireless connection and the network connection after the network connection is re-established.

10. The communication system of claim 9 wherein the context flag indicates the full network entry process is required if the context information is not maintained, the context flag indicates the partial network entry process is possible if the context information is maintained, and the context flag indicates the full network re-entry process is possible when all of the context information is maintained.

11. The communication system of claim 10 wherein the network entry process further comprises determining which network entry steps are skipped when the network entry process is the partial network entry process.

12. The communication system of claim 9 wherein the deterioration of the wireless connection occurs due to a coverage hole encountered by the mobile communication device.

13. The communication system of claim 9 wherein the wireless connection comprises a layer one connection and wherein the network connection comprises a layer three connection.

14. The communication system of claim 9 wherein exchanging the initial communications comprises exchanging the initial communications in accordance with a wireless communication protocol.

15. The communication system of claim 14 wherein the wireless communication protocol comprises at least one of Worldwide Inter-operability for Microwave Access (WiMAX) and Long Term Evolution (LTE).

16. A wireless communication device comprising:

a communication interface configured to exchange initial communications with a network access system and a communication network over a wireless connection and a network connection established with the communication network; and,

a processing system coupled to the communication interface and configured to:

perform a network entry process to establish the network connection with the communication network;

discover the network access system after a loss of the network connection due to a deterioration of the wireless connection, wherein the wireless device checks a state of a context flag stored in memory after discovering the network access system;

determine a type of network entry process required to regain the network connection based on the context flag maintained at the wireless device, wherein the context flag is indicative of whether context information was maintained during the deterioration of the wireless connection between the wireless communication device and the network access system;

initiate a network entry process with the network access system based on the context information to re-establish the network connection where the initiated network entry process is selected from a full network entry process, a partial network entry process, and a full network re-entry process, wherein all network entry steps are required to re-establish the network connection during the full network entry process, some network entry steps are required and some network entry steps are skipped to re-establish the network connection during the partial network entry process, and none of the network entry steps are required to re-establish the network connection during the full network re-entry process; and

exchange new communications with the communication network over the wireless connection and the network connection after the network connection is re-established.

Assignments (6)
TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENTS Recorded Apr 3, 2020
From: WILMINGTON TRUST, NATIONAL ASSOCIATION, AS SUCCESSOR BY MERGER TO WILMINGTON TRUST FSB
To: CLEARWIRE LEGACY LLC; CLEAR WIRELESS LLC
Reel/Frame 053182/0700 →
TERMINATION AND RELEASE OF FIRST PRIORITY AND JUNIOR PRIORITY SECURITY INTEREST IN PATENT RIGHTS Recorded Apr 1, 2020
From: DEUTSCHE BANK TRUST COMPANY AMERICAS
To: CLEARWIRE IP HOLDINGS LLC
Reel/Frame 052291/0439 →
GRANT OF FIRST PRIORITY AND JUNIOR PRIORITY SECURITY INTEREST IN PATENT RIGHTS Recorded Mar 3, 2017
From: CLEARWIRE IP HOLDINGS LLC
To: DEUTSCHE BANK TRUST COMPANY AMERICAS
Reel/Frame 041882/0875 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 27, 2011
From: CLEARWIRE COMMUNICATIONS LLC
To: CLEARWIRE IP HOLDINGS LLC
Reel/Frame 027134/0855 →
SECURITY AGREEMENT Recorded Nov 30, 2009
From: CLEARWIRE LEGACY LLC; CLEAR WIRELESS LLC
To: WILMINGTON TRUST FSB, AS COLLATERAL AGENT
Reel/Frame 023574/0539 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 31, 2009
From: LIU, CHUNMEI; OLFAT, MASOUD; HUANG, FENG; PARTOVI, MOHAMMAD HASSAN; MCGINNISS, DAVID S.
To: CLEAR WIRELESS LLC
Reel/Frame 023038/0509 →