System, apparatus and method for managing AP selection and signal quality

• US 8,351,451 B2
• Filed: 08/04/2009
• Issued: 01/08/2013
• Est. Priority Date: 08/04/2009
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Patil, Abhishek, Jing, Xiangpeng, Liu, Aixin, Nguyen, Djung N.
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): Nguyen, Thai
• Application Number:
  US12/535,563
• Publication Number:
  US 20110032913A1
• Time in Patent Office: 1,253 Days
• Field of Search: 370/338, 370/328, 370/445, 455/442, 455/443, 455/445, 455/446, 455/449, 455/453
• US Class Current: 370/429
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

An embodiment of the invention involves a method for selecting and maintaining wireless communications for wireless mesh networks between tier-2 and tier-3 nodes. The method comprises a first operation of receiving channel information from a first wireless node operating as an access point. The channel information includes each channel number used by one or more wireless nodes that are detected by the first wireless node to be operating within a signal coverage area of the first wireless node. Then, an active scan is conducted on a frequency spectrum for wireless signals based on the channel information. Such scanning is accomplished by initially scanning frequencies of each channel number used by the one or more wireless nodes. After the scanning, a determination is made whether to (i) maintain wireless communications with the first wireless node or (ii) establish new wireless communications with a new wireless node (AP). Other embodiments are described and claimed.

Claims

1. A method comprising:

receiving an access point (AP) beacon including channel information from a first wireless node operating as an access point, the channel information is placed within at least one reserved field within a media access control header of the beacon and includes each channel number used by one or more wireless nodes operating as an access point that are detected by the first wireless node to be operating within a signal coverage area of the first wireless node;

conducting an active scan of a range of frequency spectrum for wireless signals based on the channel information by initially scanning frequencies associated with each channel number used by the one or more wireless nodes; and

determining whether to (i) maintain wireless communications with the first wireless node or (ii) establish wireless communications with a selected wireless node of the one or more wireless nodes.

2. The method of claim 1, wherein the first wireless node is a tier-2 node, the tier-2 node being an electronic device with wireless capability that is both stationary and electrically powered by alternating current (AC) power.

3. The method of claim 1, wherein the one or more wireless nodes are also tier-2 nodes.

4. The method of claim 1, wherein the receiving of the channel information comprises receiving the beacon being a non-unicast message from the first wireless node, the non-unicast message including the channel information within the at least one reserved field.

5. The method of claim 1, wherein the conducting of the active scan comprises:

transmitting a query message over a wireless channel used for communications with the first wireless node;

receiving a message in response to the query message; and

measuring a link quality of the message in response to the query message, the link quality being a signal-to-noise ratio measurement for the message.

6. The method of claim 1 further comprising:

disconnecting from the first wireless node and associating with the selected wireless node upon determining to re-establish communications with a wireless network formed in part by the first wireless node and the selected wireless node via the selected wireless node.

7. The method of claim 1 further comprising:

varying a monitoring time period for newly established wireless communications with the selected wireless node by establishing a shorter monitoring time period for the newly established wireless communications with the selected wireless node and increasing the monitoring time period up to a selected static value as the newly established wireless communications with the selected wireless node ages.

8. A portable apparatus comprising:

a radio logic unit adapted for tuning to a selected frequency associated with a particular wireless channel in order to establish communications with a first wireless node operating as an access point; and

a processor in communication with the radio logic unit, the processor to;

extract channel information from a non-unicast message received from the first wireless node, the non-unicast message is an access point (AP) beacon and the channel information is placed within at least one reserved field within a media access control header of the beacon, the channel information includes a channel number used by a second wireless node that is operating as an access point and transmitting signals within a signal coverage area at least partially used by the first wireless node,

conduct an active scan of a frequency spectrum for wireless signals based on the channel information by initially scanning frequencies associated with the channel number used by the second wireless node, and

determine whether to (i) maintain wireless communications with the first wireless node or (ii) establish wireless communications with the second wireless node.

9. A memory storing software that is executed by a processor implemented within a first wireless node being a portable, battery-powered electronic device with data processing capability and wireless communication capabilities, to perform the operations of:

measuring parameters associated with a wireless signal after a monitoring time period has elapsed, the wireless signal being received over a first wireless channel from a second wireless node that is operating as an access point for a wireless network and is currently in wireless communications with the first wireless node;

performing an active scan process in (i) searching wireless channels different than the first wireless channel using a same network identification of the second wireless node, (ii) detecting wireless signals by a third wireless node over a second wireless channel, and (iii) selecting either second wireless node or the third wireless node for subsequent wireless communications;

increasing the monitoring time period by an incremental value if the second wireless node is selected; and

resetting the monitoring time period to a minimum value if the third wireless node is selected.

10. The memory software of claim 9, wherein the software is executed by the processor to perform the active scan process, where the active scan process includes (1) receiving channel information from the second wireless node, the channel information includes each channel number used by the third wireless node that is detected by the second wireless node to be operating within a signal coverage area of the second wireless node, and (2) conducting an active scan of a frequency spectrum for wireless signals based on the channel information by initially scanning frequencies associates with the channel number used by the third wireless node.

11. The software of claim 9, wherein, during the active scan process that is performed by the software executed by the processor, the first wireless node compares a strength of wireless signaling from the second wireless node with a strength of signaling from the third wireless node to make a decision on whether to switch communication from the second wireless node to the third wireless node or continue with a current association with the second wireless node.

12. The software of claim 9, wherein, during active scan process that is performed by the software executed by the processor, the first wireless node compares a strength of wireless signaling from the second wireless node with a strength of signaling from the third wireless node, wherein both the second wireless node and the third wireless node are tier-2 nodes, the tier-2 node being an electronic device with wireless capability that is both stationary and electrically powered by alternating current (AC) power.