SYNCHRONIZATION VIA ADDITIONAL BEACON TRANSMISSION

• US 20110142028A1
• Filed: 12/10/2009
• Published: 06/16/2011
• Est. Priority Date: 12/10/2009
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: KASSLIN, Mika, RANTALA, Enrico, VIRTANEN, Sami, TURUNEN, Markku, TIRRONEN, Mikko, LEPPÄNEN, Kari
• Application Number:
  US12/635,086
• Publication Number:
  US 20110142028A1
• Time in Patent Office: Days
• US Class Current: 370/350
• CPC Class Codes: H04W 56/00 Synchronisation arrangements

Abstract

Apparatuses may stay synchronized with a wireless network utilizing a diluted beacon interval that is an integer multiple of a network beacon period signal being transmitted at a set interval. Diluted beacon intervals may reduce communication burden, but may also cause periods of inactivity that allow apparatuses to become unsynchronized with the network. Apparatuses may be active in the network during an awake window wherein a beacon may be transmitted. A set time may also be set during the awake window may delineate a period of time after which any beacon signal received from another apparatus is deemed to be late. Receiving late beacon signals in the apparatus may trigger the transmission of additional beacon signals to help the other apparatuses that transmitted late beacons become resynchronized with the network.

Claims

1. A method, comprising:

transmitting a beacon signal from an apparatus during a periodic time interval in which communication is permitted in the wireless network;

receiving a late beacon signal in the apparatus, the beacon signal being deemed late due to being received after a certain time measured from the beginning of the periodic time interval; and

in response to receiving the late beacon signal, initiating transmission of an additional beacon signal.

2. The method of claim 1, wherein the apparatus participates in access contention with other apparatuses in the wireless network in order to transmit the beacon signal.

3. The method of claim 2, wherein the apparatus participates in further access contention with other apparatuses in the wireless network in order to transmit pending messages.

4. The method of claim 3, wherein if the apparatus is participating in access contention for the pending messages when the late beacon signal is received, the access contention is interrupted in favor of access contention for transmitting the additional beacon signal and the interrupted access contention for the pending messages is resumed after the additional beacon signal is transmitted.

5. The method of claim 3, wherein both the pending messages and the additional beacon signal are transmitted at the end of the access contention for the pending messages.

6. The method of claim 1, wherein the additional beacon signal comprises connectivity information usable by other apparatuses for synchronizing timing to the network.

7. A computer program product comprising computer executable program code recorded on a computer readable storage medium, the computer executable program code comprising:

code configured to cause an apparatus to transmit a beacon signal from an apparatus during a periodic time interval in which communication is permitted in the wireless network;

code configured to cause an apparatus to receive a late beacon signal in the apparatus, the beacon signal being deemed late due to being received after a certain time measured from the beginning of the periodic time interval; and

code configured to, in response to receiving the late beacon signal, cause an apparatus initiate transmission of an additional beacon signal.

8. The computer program product of claim 7, further comprising code configured to cause the apparatus to participate in access contention with other apparatuses in the wireless network in order to transmit the beacon signal.

9. The computer program product of claim 8, further comprising code configured to cause the apparatus to participate in further access contention with other apparatuses in the wireless network in order to transmit pending messages.

10. The computer program product of claim 9, wherein if the apparatus is participating in access contention for the pending messages when the late beacon signal is received, the access contention is interrupted in favor of access contention for transmitting the additional beacon signal and the interrupted access contention for the pending messages is resumed after the additional beacon signal is transmitted.

11. The computer program product of claim 9, wherein both the pending messages and the additional beacon signal are transmitted at the end of the access contention for the pending messages.

12. The computer program product of claim 7, wherein the additional beacon signal comprises connectivity information usable by other apparatuses for synchronizing timing to the network.

13. An apparatus, comprising:

at least one processor; and

at least one memory including executable instructions, the at least one memory and the executable instructions being configured to, in cooperation with the at least one processor, cause the device to perform at least the following;

transmit a beacon signal during a periodic time interval in which communication is permitted in the wireless network;

receive a late beacon signal in the apparatus, the beacon signal being deemed late due to being received after a certain time measured from the beginning of the periodic time interval; and

in response to receiving the late beacon signal, initiate transmission of an additional beacon signal.

14. The apparatus of claim 13, wherein the apparatus participates in access contention with other apparatuses in the wireless network in order to transmit the beacon signal.

15. The apparatus of claim 14, wherein the apparatus participates in further access contention with other apparatuses in the wireless network in order to transmit pending messages.

16. The apparatus of claim 15, wherein if the apparatus is participating in access contention for the pending messages when the late beacon signal is received, the access contention is interrupted in favor of access contention for transmitting the additional beacon signal and the interrupted access contention for the pending messages is resumed after the additional beacon signal is transmitted.

17. The apparatus of claim 15, wherein both the pending messages and the additional beacon signal are transmitted at the end of the access contention for the pending messages.

18. The apparatus of claim 13, wherein the additional beacon signal comprises connectivity information usable by other apparatuses for synchronizing timing to the network.