Initiation of High Speed Overlay Mode for Burst Data and Real Time Streaming (Audio) Applications

• US 20090116472A1
• Filed: 11/05/2007
• Published: 05/07/2009
• Est. Priority Date: 11/05/2007
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Powell, Clinton C., Briones, Luis J., Chang, Kuor-Hsin
• Granted Patent: US 7,990,937 B2
• Time in Patent Office: Days
• US Class Current: 370/350
• CPC Class Codes: H04L 1/0023 characterised by the signalling
• CPC Class Codes: H04L 25/0262 Arrangements for detecting the data rate of an incoming signal

Abstract

In a wireless 802.15.4 communication system, a method and system are provided for switching between a predetermined protocol transmission mode and a high-speed transmission mode by including signaling mode information in a data packet (330, 340) to instruct the receiver device (300) to demodulate at least a data payload using the predetermined transmission mode if the signaling mode information comprises a first predetermined value, and to demodulate at least the data payload using the high-speed transmission mode if the signaling mode information comprises a second predetermined value. The signaling mode information may be included in the SFD field of an 802.15.4 SHR structure to instruct the receiver how to demodulate or process the data packet, or may be included as desired anywhere in the data packet to instruct the receiver how to demodulate or process one or more subsequent data packets.

Claims

1. A method for transferring data over a short range communication link to a wireless receiving device, comprising:

receiving and processing a first data packet to extract signaling mode information;

demodulating at least a data payload in accordance with a predetermined transmission protocol if the signaling mode information comprises a first predetermined value, thereby receiving data at a first data rate; and

demodulating at least the data payload in accordance with a high-speed mode if the signaling mode information comprises a second predetermined value, thereby receiving data at a second higher data rate.

2. The method of claim 1, where the signaling mode information comprises information contained in a start-of-frame delimiter (SFD) field of an 802.15.4 data frame.

3. The method of claim 2, where the first predetermined value comprises a first SFD value and where the second predetermined value comprise a second SFD value that is different from the first SFD value.

4. The method of claim 1, where demodulating at least the data payload comprises demodulating at least a first data payload contained in the first data packet.

5. The method of claim 1, where the signaling mode information comprises a notification signal to begin demodulating at least the data payload in accordance with a high-speed mode upon reception of a subsequent, second data packet.

6. The method of claim 5, further comprising demodulating one or more subsequent data packets in accordance with the high speed mode until a packet is received which comprises a notification signal to stop demodulating the data payload in accordance with the high-speed mode.

7. The method of claim 1, where demodulating the data payload comprises demodulating a first data payload contained in a second, subsequent data packet.

8. The method of claim 1, where receiving and processing a first data packet comprises detecting a synchronization header in the first data packet in accordance with the IEEE 802.15.4 protocol.

9. The method of claim 1, where the predetermined transmission protocol comprises the IEEE 802.15.4 protocol.

10. The method of claim 1, where the second higher data rate is approximately of 2 Mbps.

11. The method of claim 1, where demodulating at least the data payload in accordance with a high-speed mode comprises:

demodulating a first part of a second data packet by despreading only selected data bits in the second data packet; and

separately processing at least a data payload portion of the second data packet so that the data payload portion is not despread.

12. A device for detecting a high-speed overlay data frame that is transmitted over a wireless personal area network, comprising:

a physical layer (PHY) module for receiving a radio signal and processing the radio signal into a digital data frame;

a digital modem module operatively coupled to the PHY module for extracting signaling mode information from the digital data frame and demodulating at least part of the digital data frame in accordance with a predetermined transmission protocol if the signaling mode information comprises a first predetermined value, but demodulating at least part of the digital data frame in accordance with a high-speed overlay mode if the signaling mode information comprises a second predetermined value; and

a media access control layer (MAC) module operatively coupled to the digital modem module for providing addressing and channel access control functions for the wireless personal area network.

13. The device of claim 12, where the predetermined transmission protocol comprises an IEEE 802.15.4 protocol.

14. The device of claim 12, where the digital modem module comprises:

an 802.15.4 receive modem for detecting a synchronization header in the digital data frame in accordance with the IEEE 802.15.4 protocol;

a start-of-frame delimiter (SFD) detection module for detecting signaling mode information from a predetermined SFD value in the synchronization header; and

a high-speed receive modem for applying a non-despreading demodulation process to demodulate a data payload portion of the digital data frame if the predetermined SFD value is detected in the synchronization header.

15. The device of claim 14, where the predetermined SFD value has a large hamming distance from a standard SFD value that is used in a standard 802.15.4 data frame.

16. The device of claim 12, where the digital modem module comprises:

an 802.15.4 receive modem for demodulating a first digital data frame in accordance with an 802.15.4 protocol;

a detection module for detecting a first notification in the first digital data frame to begin demodulating at least a data payload portion in a subsequently received digital data frame in accordance with a high-speed overlay mode; and

a high-speed receive modem for applying a non-despreading demodulation process to demodulate at least the data payload portion in the subsequently received digital data frame if the first notification is detected in the first digital data frame.

17. The device of claim 16, where the high-speed receive modem applies the non-despreading demodulation process to demodulate one or more subsequently received digital data frames until a second data frame is received which comprises a notification signal to stop demodulating digital data frames in accordance with the high-speed overlay mode.

18. A device for transmitting one or more data frames in a high-speed overlay mode over a wireless personal area network, comprising:

a media access control layer (MAC) module for generating a digital data frame to be transmitted over the wireless personal area network using either a predetermined transmission protocol or a high-speed overlay transmission mode, where the MAC module generates a first signaling mode value if the predetermined transmission protocol is to be used and generates a second signaling mode value if the high-speed overlay transmission mode is to be used;

a digital modem module operatively coupled to a MAC module for generating a spread-modulated data frame whereby all of the digital data frame is spread modulated when the digital data frame is to be transmitted using the predetermined transmission protocol, and for generating a separately modulated digital data frame whereby only a synchronization header portion of the digital data frame is spread modulated when the digital data frame is to be transmitted using the high-speed overlay transmission mode; and

a physical layer (PHY) module for processing a modulated digital data frame into a radio signal.

19. The device of claim 18, where the MAC module includes the first signaling mode value in the data frame as a standard 802.15.4 start-of-frame delimiter (SFD) value when the predetermined transmission protocol is to be used to transmit the data frame, and where the MAC module includes the second signaling mode value in the data frame as second SFD value that is different from the standard SFD value when the high-speed overlay transmission mode is to be used.

20. The device of claim 18, where the MAC module includes a first notification in the digital data frame for a receiver to begin demodulating at least a data payload portion in a subsequently received digital data frame in accordance with a high-speed overlay mode.