CN101138175A - Method to synchronize receiver's clock to transmitter's clock at sub-100nsec - Google Patents
Method to synchronize receiver's clock to transmitter's clock at sub-100nsec Download PDFInfo
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- CN101138175A CN101138175A CNA2006800080283A CN200680008028A CN101138175A CN 101138175 A CN101138175 A CN 101138175A CN A2006800080283 A CNA2006800080283 A CN A2006800080283A CN 200680008028 A CN200680008028 A CN 200680008028A CN 101138175 A CN101138175 A CN 101138175A
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Abstract
A sender (702) transmits one or more frames to a receiver (704). The receiver (704) either calculates a carrier frequency difference or a time difference using the one or more frames. A clock (722) in the receiver (704) is synchronized with a clock (714) in the sender (702) using the carrier frequency difference or the time difference.
Description
Background technology
In wireless system, transmitter typically sends grouping or frame to the receiving equipment of appointment, and this receiving equipment provides in order to send the time of subsequent frame to receiver.The defined time is based on the local clock of transmitter in frame.Then, receiver is with the clock synchronization of its local clock and transmitter.Allow receiver to carve in due course synchronously and open its CCA module, receive correct frame then.
(USB) drafts in the standard at radio universal serial bus, discloses an example of the scheduling of Data Receiving or transmission.This standard allows main frame to send microtubule reason control (MMC) frame to equipment.The MMC frame scheduling time of equipment, receiver receives slave unit or to equipment sending data thus.
The wireless medium access of MBOA (multi-band OFDM alliance) control (MAC) standard at the device definition that operates in same channel the another kind of form of clock synchronization.All devices at the appointed time locates to send beacon frame.When one or more equipment clocks had drifted about away from common time, this beacon was no longer with identical time transmission.Then, all devices and the last device synchronization that sends beacon, thus proofread and correct or compensated clock drift.
The accuracy of WUSB and MBOA Clock Synchronization Technology is greater than 1 microsecond or bigger.In identical systems, the level of this accuracy is not enough.For example, in (TFI) system that interweaves in temporal frequency, when miscellaneous equipment operated in other TFI channel, receiver operation was in specific T FI channel.Frame from other TFI channel can interweave with the frame by specific T FI Channel Transmission, and this has caused the interference of simultaneous operation piconet (SOP).SOP disturbs and can cause clear channel (clear channel) assessment (CCA) to detect failure.
Fig. 1 is by the diagrammatic illustration according to two frames of the TFI Channel Transmission of prior art.Transmitter sends to receiver with the frame (not shown), and having indicated will be at t
1Moment transmit frame 100.When receiver clock can not be effectively with transmitter clock when synchronous, receiver can be opened (that is t constantly, too early
0).This causes receiver received frame 102 rather than frame 100 mistakenly.Because receiver can not in time reset with received frame 100, receiver fails to detect frame 100.In addition, make receiver early than opening between in case of necessity, it is many to make that the power ratio receiver clock of receiver consumption is consumed when effectively synchronous with transmitter clock.
Summary of the invention
According to the present invention, provide a kind of wireless system receiver clock and synchronous method of transmitter clock of being used for.Transmitter is transferred to receiver with one or more frames.Receiver uses one or more frames to calculate carrier frequency difference or time difference.By using carrier frequency difference or time difference, the clock of receiver and the clock of transmitter are carried out synchronously.
Description of drawings
In conjunction with the accompanying drawings, and, can understand the present invention fully with reference to following according to an embodiment of the invention detailed description, in the accompanying drawings:
Fig. 1 is by the diagrammatic illustration according to two frames of the TFI Channel Transmission of prior art;
Fig. 2 is the diagrammatic illustration of first frame format in an embodiment according to the present invention;
Fig. 3 is being diagrammatic illustration according to second frame format in the embodiments of the invention;
Fig. 4 is used to use frame shown in Figure 2 or frame shown in Figure 3 to come the clock of the clock of receiver and transmitter is carried out the flow chart of the first synchronous method;
Fig. 5 is the flow chart that is used in an embodiment according to the present invention the clock of the clock of receiver and transmitter is carried out the second synchronous method;
Fig. 6 is the flow chart that is used in an embodiment according to the present invention the clock of the clock of receiver and transmitter is carried out synchronous third party's method.
Fig. 7 is the block diagram of having demonstrated according to the wireless system in the embodiments of the invention.
Embodiment
Following description has been proposed, to enable those skilled in the art to generation and to use according to embodiments of the invention.For those skilled in the art, will be apparent to the various modifications of the disclosed embodiments, and the universal principle here can be applied to other embodiment.Therefore, the embodiment shown in the present invention is not intended to be limited to, but consistent with the scope the most widely that meets claims and principle as described herein and feature.
With reference to the accompanying drawings, specifically be with reference to figure 2, show the diagrammatic illustration of first frame format according to an embodiment of the invention.In an embodiment according to the present invention, frame 200 comprises 6 fields, and is configured to the PHY frame.Field 202 is configured to be used for the preamble field of various functions.For example, network or equipment can use preamble field to come the existence of detection signal.
In an embodiment according to the present invention, field 208,210,212 forms PLCP header 214.Field 208 is configured to length field, is used for indicating with byte the length of payload.Field 210 is the signaling fields of having indicated signal rate or speed.Field 212 is configured to be used for the Frame Check Sequence of error checking.Typically, Frame Check Sequence 212 comprises Cyclic Redundancy Check.And last, field 216 is configured to Payload or client data field.
Fig. 3 is the diagrammatic illustration according to second frame format in the embodiments of the invention.In an embodiment according to the present invention, frame 300 comprises 8 fields, and is configured to MBOA MACPHY frame.Field 302 is configured to preamble field, uses it for the existence of detection signal by network or equipment, and prepares included data in the received frame 300.
With reference to Fig. 4, show and use frame shown in Figure 2 or frame shown in Figure 3 to come the clock of the clock of receiver and transmitter is carried out the flow chart of synchronous method.At first, shown in frame 400, from the transmitter received frame.Then, receiver is checked at 404 pairs of these frames of frame.If this frame is a MAC PHY frame (see figure 2), then the physical layer of receiver is checked PLCP preamble and PLCP header, and calculates carrier frequency difference at frame 306.If this frame is a MBOA MACPHY frame (see figure 3), then mac controller obtains clock accuracy information from field 316, and calculates carrier frequency difference at frame 306.Then, by using the carrier frequency difference of being calculated, receiver carries out (frame 308) synchronously with the clock of its clock and transmitter.
Fig. 5 is the flow chart that is used for the clock of the clock of receiver and transmitter is carried out the second synchronous method in an embodiment according to the present invention.At first, shown in frame 500, from the transmitter received frame.Then, timestamp is associated with frame (frame 502).Timestamp has been indicated the time of the clock of receiver when receiving frame.In an embodiment according to the present invention, mac controller adds timestamp to each frame that receives from physical layer.In according to one embodiment of present invention, mac controller adds timestamp to frame.In according to another embodiment of the invention, mac controller all is stored in each timestamp in the formation.
Then, shown in frame 504, receive subsequent frame by receiver.Then, timestamp is associated with subsequent frame (frame 506).Timestamp has been indicated the time of receiver clock when receiving frame.Then, receiver uses two timestamps to come computing time poor (frame 508).In an embodiment according to the present invention, this difference comprises that guard time, propagation time and clock synchronization are poor.By using the time difference of being calculated, receiver carries out (frame 510) synchronously with the clock of its clock and transmitter.
With reference to Fig. 6, show the flow chart that is used for the clock of the clock of receiver and transmitter is carried out synchronous third party's method in an embodiment according to the present invention.At first, as described in frame 600, receive frame from transmitter.Then, at frame 602, receiver receives subsequent frame from transmitter.Receiver is poor with respect to its computing time local clock time based on the time that it receives two frames.In an embodiment according to the present invention, this time difference comprises that guard time, propagation time and clock synchronization are poor.By using the time difference of being calculated, receiver carries out (frame 606) synchronously with the clock of its clock and transmitter.
For example, at frame 600 according to an embodiment of the invention, transmitter transmission MMC frame.The MMC frame has been indicated the time that will send the usb data frame to receiver.The usb data frame is second frame that is received at frame 602 by receiver.Receive time difference between the time of second frame and time that receiver receives first frame based on receiver, receiver calculates this time difference.
In according to another embodiment of the invention, transmitter is at the transmission of frame 600 places according to an embodiment of the invention MMC frame.The MMC frame has been indicated the time that will send follow-up MMC frame to receiver.Follow-up MMC frame is second frame that is received at frame 602 by receiver.Receive time difference between the time of second frame and time that receiver receives first frame based on receiver, receiver calculates this time difference.
Fig. 7 is a block diagram of having demonstrated wireless system in an embodiment according to the present invention.System 700 comprises transmitter 702 and receiver 704.Transmitter 702 transmits one or more frames by wireless communication link 706 to receiver 704.This frame is made of MAC layer 708 and physical layer 710.In an embodiment according to the present invention, MAC layer 708 and physical layer 710 are included in the mac controller 712.
In an embodiment according to the present invention, one or more frames comprise with by the information of local clock 714 defined time correlations.For example, in according to one embodiment of present invention, one or more frames are configured to MAC PHY frame.In according to other embodiments of the invention, one or more frames are configured to MBOA MAC PHY frame or MMC frame.
Claims (19)
1. a clock (722) that is used for the receiving equipment (704) to wireless network carries out synchronous method with the clock (714) of transmitting apparatus (702), comprising:
Receive first frame;
Determine that expression receiving equipment (704) receives the very first time of first frame;
Receive second frame; Determine that expression receiving equipment (704) receives second time of second frame;
Use the very first time and second computing time time poor; And
Service time is poor, and the clock (722) of receiving equipment (704) and the clock (714) of transmitting apparatus (702) are carried out synchronously.
2. the method for claim 1, wherein receive first frame and comprise reception the one MMC frame.
3. method as claimed in claim 2 wherein, receives second frame and comprises reception the 2nd MMC frame.
4. method as claimed in claim 2 wherein, receives second frame and comprises reception usb data frame.
5. the very first time of the method for claim 1, wherein determining indication receiving equipment (704) reception second frame comprises: the very first time is stabbed add first frame to.
6. method as claimed in claim 5, wherein, second time that is identified for indicating receiving equipment (704) to receive second frame comprises: add second timestamp to second frame.
7. method as claimed in claim 6 wherein, is used poor comprising of first and second computing times time: use first and second timestamps to come computing time poor.
8. a clock (722) that is used for the receiving equipment (704) to wireless network carries out synchronous method with the clock (714) of transmitting apparatus (702), comprising:
Reception comprises the frame of preamble and header;
Use preamble and header to calculate carrier frequency difference; And
Use carrier frequency difference to come the clock (722) of receiving equipment (704) and the clock (714) of transmitting apparatus (702) are carried out synchronously.
9. method as claimed in claim 8 wherein, is used preamble and header to calculate carrier frequency difference and is comprised: uses PLCP preamble (206) and PLCP header (214) to calculate carrier frequency difference.
10. method as claimed in claim 8 wherein, is used preamble and header to calculate carrier frequency difference and is comprised: obtain carrier frequency difference in the one or more bits from the filling field (316) of frame.
11. a receiving equipment (704) comprising:
Clock (722); And
Controller (720) can operate in and calculate expression and receive the very first time of first frame and receive time difference between second time of second frame, and can operate in the time difference that use calculates and adjust clock (722).
12. receiving equipment as claimed in claim 11 (704), wherein, first frame comprises a MMC frame.
13. receiving equipment as claimed in claim 12 (704), wherein, second frame comprises the 2nd MMC frame.
14. receiving equipment as claimed in claim 12 (704), wherein, first frame comprises the usb data frame.
15. receiving equipment as claimed in claim 11 (704), wherein, described controller (720) can operate in and add very first time stamp to first frame, and add second timestamp to second frame, and described controller (720) can operate in and uses first and second timestamps to come computing time poor.
16. a receiving equipment (704) comprising:
Clock (722); And
Controller (720) can operate in and use the frame receive to determine carrier frequency difference, and can operate in the carrier frequency difference that use calculates and adjust clock (722).
17. receiving equipment as claimed in claim 16 (704), wherein, the frame that receives comprises preamble and header, and described controller (720) can operate in the use preamble and header is determined carrier frequency difference.
18. receiving equipment as claimed in claim 17 (704), wherein, described frame comprises MAC PHY frame (200), and described preamble and header comprise PLCP preamble (206) and PLCP header (214).
19. receiving equipment as claimed in claim 16 (704), wherein, described frame comprises MBOA MAC PHY frame (300), and described controller (720) can operate in according to the one or more data bits in the filling field (316) of MBOA MAC PHY frame (300) and determines carrier frequency difference.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64407805P | 2005-01-14 | 2005-01-14 | |
| US60/644,078 | 2005-01-14 | ||
| US60/676,363 | 2005-04-28 |
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| Publication Number | Publication Date |
|---|---|
| CN101138175A true CN101138175A (en) | 2008-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800080283A Pending CN101138175A (en) | 2005-01-14 | 2006-01-13 | Method to synchronize receiver's clock to transmitter's clock at sub-100nsec |
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| CN (1) | CN101138175A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771425B (en) * | 2008-12-29 | 2013-04-17 | 爱特梅尔汽车股份有限公司 | Receiver and method for operating the same |
-
2006
- 2006-01-13 CN CNA2006800080283A patent/CN101138175A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771425B (en) * | 2008-12-29 | 2013-04-17 | 爱特梅尔汽车股份有限公司 | Receiver and method for operating the same |
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