WIRELESS COMMUNICATIONS BETWEEN A PERIPHERAL AND A MOBILE UNIT IN A WIRELESS NETWORK ENVIRONMENT

• US 20080062939A1
• Filed: 05/29/2007
• Published: 03/13/2008
• Est. Priority Date: 09/07/2006
• Status: Abandoned Application

• Current Assignee: Microchip Technology Incorporated
• Original Assignee: Microchip Technology Incorporated
• Inventors: Friedman, David, Horn, Peter Van
• Application Number:
  US11/754,943
• Publication Number:
  US 20080062939A1
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 74/06 using polling

Abstract

Systems and methods of wireless communications between a peripheral and a mobile unit in a wireless network environment are described. In one aspect, a trigger frame is wirelessly transmitted in accordance with a wireless local area network (LAN) communications protocol in response to a determination to acquire data wirelessly from a target peripheral. The trigger frame reserves a wireless channel for a duration sufficient to meet a time needed by the target peripheral to transmit local data. The target peripheral awaits receipt of a trigger frame from a target mobile unit before wirelessly transmitting local data. In response to receipt of the trigger frame, the target peripheral transmits the local data to the target mobile unit over the wireless channel during the reserved duration in accordance with a wireless local area network (LAN) communications protocol.

Claims

1. A method, comprising:

in response to a determination to acquire data wirelessly from a target peripheral, wirelessly transmitting a trigger frame in accordance with a wireless local area network (LAN) communications protocol, wherein the trigger frame reserves a wireless channel for a duration sufficient to meet a time needed by the target peripheral to transmit local data, and the trigger frame prompts the target peripheral to transmit the local data over the wireless channel during the reserved duration in accordance with a wireless local area network (LAN) communications protocol;

receiving local data transmitted by the target peripheral over the wireless channel; and

processing the received local data.

2. The method of claim 1, wherein the trigger frame comprises a duration value equal to the reserved duration.

3. The method of claim 1, wherein the transmitting comprises wirelessly transmitting the trigger frame in accordance with an IEEE 802.11 wireless communications protocol.

4. The method of claim 3, wherein the trigger frame is an IEEE 802.11 clear-to-send (CTS) frame.

5. The method of claim 4, wherein the transmitting is performed without any prior transmission of any IEEE 802.11 request-to-send (RTS) frames.

6. The method of claim 3, wherein the trigger frame is an IEEE 802.11 data frame.

7. The method of claim 3, further comprising omitting transmission of any IEEE 802.11 acknowledgement (ACK) frames to the target peripheral in response to receipt of the local data.

8. The method of claim 3, further comprising repeating the transmitting at regular intervals of time without regard to receipt of any IEEE 802.11 data frames containing the local data from the target peripheral.

9. The method of claim 1, further comprising communicating with at least one network device other than the target peripheral in accordance with an IEEE 802.11 wireless LAN transmission protocol, wherein the transmitting, the receiving, and the communicating are performed by a single RF radio transceiver.

10. A method, comprising:

awaiting receipt of a trigger frame from a target mobile unit before wirelessly transmitting local data, wherein the trigger frame reserves a wireless channel for a duration sufficient to meet a time needed to transmit the local data to the target mobile unit in accordance with a wireless local area network (LAN) communications protocol; and

in response to receipt of the trigger frame, transmitting the local data to the target mobile unit over the wireless channel during the reserved duration in accordance with a wireless local area network (LAN) communications protocol.

11. The method of claim 10, further comprising updating the local data during the awaiting.

12. The method of claim 10, wherein the transmitting comprises wirelessly transmitting the local data to the target mobile unit over the wireless channel during the reserved duration in accordance with an IEEE 802.11 wireless communications protocol.

13. The method of claim 12, further comprising repeating the updating, the awaiting, and the transmitting, wherein the repeating comprises:

after the transmitting determining whether an IEEE 802.11 acknowledgement (ACK) frame was transmitted by the target mobile unit in response to the transmitting;

repeating the updating in response to a positive determination that the ACK frame was transmitted by the target mobile unit; and

repeating the awaiting and transmitting in response to a negative determination that the ACK frame was transmitted by the target mobile unit.

14. The method of claim 12, wherein the trigger frame comprises an IEEE 802.11 destination address value identifying the target peripheral and, before the transmitting, further comprising determining that the trigger frame has been received based on a comparison of the destination address value to a locally stored address value.

15. The method of claim 12, wherein the trigger frame is an IEEE 802.11 clear-to-send (CTS) frame.

16. The method of claim 12, wherein the trigger frame is an IEEE 802.11 data frame.

17. The method of claim 10, wherein the transmitting is performed by a wireless communications resource, and

further comprising, during the awaiting, turning off the wireless communications resource at times outside transmission periods during which respective trigger frames are scheduled to be sent by the target mobile unit.

18. The method of claim 17, further comprising turning on the wireless communications resource at times outside the transmission periods in response to failure to receive any trigger frames from the mobile unit in a specified number of consecutive ones of the transmission periods.

19. A system, comprising:

a mobile unit comprising a processing system and an RF radio transceiver,

wherein, in response to a determination to acquire data wirelessly from a target peripheral, the mobile unit wirelessly transmits a trigger frame via the RF radio transceiver in accordance with a wireless local area network (LAN) communications protocol, the trigger frame reserves a wireless channel for a duration sufficient to meet a time needed by the target peripheral to transmit local data to the mobile unit over the wireless channel during the reserved duration in accordance with a wireless LAN communications protocol.

20. The system of claim 19, wherein the mobile unit wirelessly transmits the trigger frame in accordance with an IEEE 802.11 wireless communications protocol.

21. The system of claim 20, wherein the trigger frame is an IEEE 802.11 clear-to-send (CTS) frame.

22. The system of claim 20, wherein the mobile unit transmits the trigger frame without any prior transmission of any IEEE 802.11 request-to-send (RTS) frames.

23. The system of claim 20, wherein the trigger frame is an IEEE 802.11 data frame.

24. The system of claim 20, wherein the mobile unit omits transmission of any IEEE 802.11 acknowledgement (ACK) frames to the target peripheral in response to receipt of any IEEE 802.11 data frames containing the local data from the target peripheral.

25. The system of claim 20, wherein the mobile unit repeats the transmission of the trigger frame at regular intervals of time without regard to receipt of the local data from the target peripheral.

26. The system of claim 20, wherein the mobile unit communicates with an access point via the RF radio transceiver in accordance with an IEEE 802.11 wireless transmission protocol.

27-36. -36. (canceled)

37. A system, comprising:

a peripheral comprising a processing system and an RF radio transceiver, wherein

the peripheral awaits receipt of a trigger frame from a target mobile unit before wirelessly transmitting local data, wherein the trigger frame reserves a wireless channel for a duration sufficient to meet a time needed to transmit the local data to the target mobile unit in accordance with a wireless local area network (LAN) communications protocol, and

in response to receipt of the trigger frame, the peripheral transmits the local data to the target mobile unit over the wireless channel during the reserved duration in accordance with a wireless LAN communications protocol.

38. The system of claim 37, wherein the peripheral wirelessly transmits the local data to the target mobile unit over the wireless channel during the reserved duration in accordance with an IEEE 802.11 wireless communications protocol.