Dynamic network master handover scheme for wireless computer networks

• US 6,434,113 B1
• Filed: 04/09/1999
• Issued: 08/13/2002
• Est. Priority Date: 04/09/1999
• Status: Active Grant

• Current Assignee: Cirrus Logic Incorporated
• Original Assignee: ShareWave, Inc. (Cirrus Logic Incorporated)
• Inventors: Gubbi, Rajugopal R.
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): HYUN, SOON D
• Application Number:
  US09/288,947
• Time in Patent Office: 1,222 Days
• Field of Search: 370/216, 370/218, 370/219, 370/241, 370/242, 370/245, 370/276, 370/277, 370/338, 370/480, 370/457, 370/254, 370/255, 709/208, 709/209
• US Class Current: 370/216
• CPC Class Codes: H04B 7/26 at least one of which is mobile
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements

Abstract

A network node is configured control operations in a wireless computer network and to automatically hand over network master operations to an alternate network master device upon detecting an operational failure of the network node. In a further embodiment, in response to detecting at a network node of a wireless computer network an impending operational failure of the network node, the node automatically negotiates the hand over of network control responsibilities for the wireless computer network to an alternate network master. Such network control responsibilities may include bandwidth allocation among network clients within the wireless computer network. In still another embodiment, in response to detecting at a node of a wireless computer network (e.g., utilizing a half-duplex communication link) the absence of a master network node, the node will automatically configure itself as an alternate network master. This process may include negotiating with other master-capable nodes of the network for control of the network. Further, the node may search for an absent master node before assuming control of the network.

Claims

1. A method comprising:

transmitting one or more connection requests from a first node on a network to one or more other nodes on the network;

receiving no response from an original network master device;

causing the first node to enter a master search negotiation mode, wherein the first node communicates with the one or more other nodes on the network to determine which device will attempt to locate the network master device;

designating the first node or other node as a master search device, wherein the designated master search device searches for the silent original network master device by transmitting one or more connection requests at various intervals over one or more available communications channels; and

reverting the node acting as the master search device to normal network operations if a response is received from the original network master device.

2. The method of claim 1, further comprising:

otherwise designating the node acting as the master search device as a substitute network master device until such time as operation of the original network master device is detected.

3. The method of claim 2, further comprising:

causing the substitute network master device to enter a master handover mode upon said detection of operation of the original network master device.

4. The method of claim 3, further comprising:

receiving a command from the original network master device instructing the substitute network master device to cease network master operations;

automatically transferring control of network operations from the node acting as the substitute network master client to the original master device upon receipt of said command; and

causing said node to resume operations as a network client upon successful handover of control to the original network master device.