WO1998021897B1 - Methods and apparatus for synchronization in a wireless network - Google Patents
Methods and apparatus for synchronization in a wireless networkInfo
- Publication number
- WO1998021897B1 WO1998021897B1 PCT/US1997/020659 US9720659W WO9821897B1 WO 1998021897 B1 WO1998021897 B1 WO 1998021897B1 US 9720659 W US9720659 W US 9720659W WO 9821897 B1 WO9821897 B1 WO 9821897B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- signal
- clock signal
- mobile station
- timing information
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims abstract 8
- 230000000875 corresponding Effects 0.000 claims 5
- 230000000051 modifying Effects 0.000 claims 4
- 230000000737 periodic Effects 0.000 claims 3
- 230000003252 repetitive Effects 0.000 claims 3
- 101700064519 PSTN Proteins 0.000 abstract 2
- 230000001360 synchronised Effects 0.000 abstract 1
Abstract
As part of a preferred communication protocol, base stations (12) which are synchronized to a PSTN (20) of a wireless communication network (10), periodically transmit a preamble. A remote detects the preamble and, upon verification of the data contained in the base station transmission, sets its counter to an initialized state based on the received preamble. An early/late analysis of each subsequently received base station timing pulse is used to adjust both the mobile station timing and to adjust the output frequency of the mobile station master clock and codec clock to effectively maintain end to end synchronization with the respective base station and the PSTN throughout the duration of an established communication link.
Claims
AMENDED CLAIMS
[received by the International Bureau on 8 October 1998 (08.10.98); original claims 1, 7, 10-12, 14-17, 21-24 and 26-27 amended; original claim 13 cancelled; remaining claims unchanged (8 pages)]
1. A communication system comprising: a base station, said base station having a base station clock circuit having as an output a base station clock signal comprising base station timing information, said base station clock signal forming an input to a base station radio, said base station radio including circuitry for repetitive transmission of information based upon said base station timing information; a mobile station, said mobile station comprising a mobile station radio for repetitively receiving said transmitted information, said mobile station comprising a radio interface module having as one of its inputs said repetitively transmitted information, said radio interface module comprising circuitry for deriving said base station timing information from said transmitted information, said radio interface module having as an output a timing signal indicative of said base station timing information, said timing signal forming an input to a mobile station clock circuit; said mobile station clock circuit comprising circuitry for generating a mobile station clock signal based upon said base station timing information and circuitry for updating said mobile station clock signal upon receipt of said repetitive transmissions comprising a first dividing circuit for deriving a first lower frequency component square wave signal from said mobile station clock signal; a second dividing circuit for deriving a second lower frequency component square wave signal from said base station timing information; and
an XOR circuit for comparing said first and second lower frequency component square wave signals.
2. The communication network of claim 1, said base station timing information comprising a preamble.
3. The communication network of claim 1, wherein said circuitry for deriving said base station timing information from said transmitted information comprises a digital matched filter circuit which produces a matched filter detect pulse indicative of the base station timing information.
4. The communication network of claim 1, wherein said mobile station clock circuit comprises an adjustable oscillator circuit.
5. The communication network of claim 4, wherein the frequency of said mobile station clock signal varies according to a change in a voltage applied across said adjustable oscillator circuit.
6. The communication network of claim 4, wherein said mobile station clock circuit comprise a varactor tuning circuit which applies a variable voltage across said adjustable oscillator circuit.
7. The communication network of claim 4, wherein said XOR circuit generates a corresponding comparison output signal which is input to said variable oscillator circuit.
8. The communication network of claim 7, further comprising a varactor tuning circuit which applies a voltage across said adjustable oscillator circuit directly proportional to said comparison output signal.
9. The communication network of claim 1, further comprising a base station controller, said base station controller includes as one input said base station clock signal and outputs timing information to said radio based upon said base station clock signal.
10. A communication system comprising: a base station, said base station having a base station clock circuit having as an output a base station clock signal comprising base station timing information, said base station clock signal forming an input to a base station radio, said base station radio including circuitry for repetitive transmission of information based upon said base station timing information; a mobile station, said mobile station comprising a mobile station radio for repetitively receiving said transmitted information, said mobile station comprising a radio interface module having as one of its inputs said repetitively transmitted information, said radio interface module comprising circuitry for deriving said base station timing information from said transmitted information, said radio interface module having as an output a timing signal indicative of said base station timing information, said timing signal forming an input to a mobile station clock circuit; said circuitry for deriving said base station timing information from said transmitted information comprises a digital matched filter having said received transmission as an input and having as an output a timing pulse indicative of said base station timing information; an early/late detector having as an input a timing pulse and having as an output a timing adjustment signal; and
a pulse width modulator having as an input said timing adjustment signal and having as an output said timing signal which comprises a pulse width modulated signal .
11. A communication network, comprising: a base station, said base station having an adjustable base station oscillator circuit outputting a base station clock signal, means for adjusting said base station oscillator circuit, and means for transmitting said base station clock signal; and a mobile station, said mobile station having means for receiving said base station clock signal, an adjustable mobile station oscillator circuit outputting a mobile station clock signal, means for comparing said mobile station clock signal to said base station clock signal and for generating a corresponding base station clock comparison output signal, means for adjusting said mobile station oscillator circuit based on said base station clock comparison output signal, means for generating a reference clock signal derived from a referenced network, a first dividing circuit for deriving a lower frequency component signal from said base station clock signal, and means for comparing said lower frequency component signal with said reference clock signal and generating
a corresponding reference signal comparison output signal .
12. The communication network of claim 11, wherein said reference clock signal has a frequency which is a lower frequency component of said base station clock signal frequency
14. The communication network of claim 11, wherein said means for adjusting said base station oscillator circuit comprises a varactor tuning circuit which supplies a voltage across said oscillator circuit directly proportional to said reference signal comparison output signal .
15. The communication network of claim 11, wherein said lower frequency component signal comprises a first square wave, said reference clock signal comprises a second square wave, and said means for comparing said lower frequency component signal to said reference clock signal comprise an XOR circuit.
16. The communication network of claim 11, wherein said reference clock signal is derived from a public switched telephone network.
17. The communication network of claim 11, wherein said base station adjustable oscillator circuit comprises a voltage sensitive 20 MHZ crystal and said reference clock signal comprises a 4 KHz square wave derived from an 8 KHz analog signal supplied by a public switched telephone network.
18. The communication network of ciaim 11, said mobile station further comprising means for generating a vocoder clock signal, wherein said mobile station clock signal and
said vocoder clock signal each comprise a multiple of a common lower frequency component signal .
19. The communication network of claim 18, wherein said means for generating said vocoder clock signal comprise an adjustable vocoder timing oscillator circuit.
20. The communication network of claim 19, said mobile station further comprising means for deriving a first lower frequency component signal from said mobile station clock signal, means for deriving a second lower frequency component signal from said vocoder clock signal, and means for comparing said first and second lower frequency component signals and generating a corresponding mobile station clock comparison output signal .
21. A method of synchronizing a base station and a remote station in a communication network, comprising: generating timing information at the base station; transmitting said timing information from the base station to the mobile station; generating a clock signal at the mobile station; deriving a first lower frequency component square wave signal from said mobile station clock signal; and deriving a second lower frequency component square wave signal from said base station timing information; comparing said timing information and said clock signals at said mobile station; adjusting said clock signal to match said timing information.
22. The method of synchronizing of claim 21, further comprising: comparing said timing information with a reference clock signal derived from a reference network; and adjusting said timing information to match said reference clock signal .
23. The method of synchronizing of claim 21, further comprising: receiving periodic GPS pulse signals at the base station; and resetting a signal frame transmission cycle derived from said timing information upon receipt of a GPS pulse signal.
24. A method of synchronizing communication signals sent between a base station and a mobile station in a communication network, comprising: generating a first clock signal at the base station; comparing said first clock signal with a reference clock signal derived from a reference network; adjusting said first clock signal to match said reference clock signal; transmitting a signal to said base station from which the adjusted first clock signal can be derived; deriving said adjusted clock signal at the remote station generating a second clock signal at the remote station; comparing said first and second clock signals; adjusting said second clock signal to match said derived adjusted first clock signal; receiving periodic GPS pulse signals at the base station; and resetting a signal frame transmission cycle derived from said first clock signal upon receipt of a GPS pulse signal.
25. The method of synchronizing communication signals of claim 24, wherein the signal transmitted is in the form of a non-data carrying preamble of a communication signal; and wherein the adjusted first clock signal is derived by detecting said preamble at the remote station with a digital matched filter circuit which produces a matched filter detect pulse .
26. A method of synchronizing communication signals sent between stations of a communication network, comprising: generating a first clock signal at a first station; operating communication circuitry at said first station according to a first station frame transfer cycle matching said first clock signal; comparing said first clock signal with a reference clock signal derived from a reference network; adjusting said first clock signal to match said reference clock signal; generating a second clock signal a second station; operating communication circuitry at said second station according to a second station frame transfer cycle matching said second clock signal; comparing said first and second clock signals; and adjusting said second clock signal to match said first clock signal .
27. The method of synchronizing communication signals of claim 26, further comprising: receiving periodic GPS pulse signals at the first station; and resetting said first station frame transfer cycle upon receipt of a GPS pulse signal .
Statement under Article 19(1)
The Examiner has indicated that U.S. Patent No. 4,231,114 ("the '114 patent") is of particular relevance to the claims ofthe present application and that the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when this document is taken alone. Without acquiescing to the Examiner's comments, claim 1 has been amended to include the structure ofthe circuitry within the mobile station clock circuit. The '114 patent does not disclose the mobile station clock circuit comprising a first dividing circuit for deriving a first lower frequency component square wave signal from said mobile station clock signal; a second diving circuit for deriving a second lower frequency component square wave signal from said base station timing information; and an XOR circuit for comparing said first and second frequency component square wave signals as that of amended claim 1. Amended claim 1 is therefore novel over the ' 114 patent. By virtue of their dependency from claim 1 , claims 2-9 are likewise novel over the ' 114 patent.
Claim 10 has been rewritten in independent form and claims a circuitry structure for deriving base station timing information comprising a digital matched filter having said received transmission as an input and having as an output a timing pulse indicative of said base station timing information: an earlv/late detector having as an input a timing pulse and having as an output a timing adjustment signal; and a pulse width modulator having as an input said timing adjustment signal and having as an output said timing signal which comprises a pulse width modulated signal. The ' 114 patent does not disclose such a circuitry structure. Claim 10 is therefore novel over the ' 114 patent.
Claim 11 has been amended to further define the function ofthe base station ofthe present invention. The '114 patent does not disclose a mobile station that includes a first dividing circuit for deriving a lower frequency component signal from said base station clock signal and means for comparing said lower frequency component signal with said reference clock signal and generating a corresponding reference signal comparison output signal. Amended claim 11 is therefore novel over the ' 114 patent. By virtue of their dependency from claim 11, claims 12-20 are likewise novel over the '114 patent.
40
Claim 21 has been similarly amended to include the method of synchronization by deriving a first lower frequency component square wave signal from said mobile station clock signal and deriving a second lower frequency component square wave signal from said base station timing information. The ' 114 patent does not disclose such a method. Amended claim 21 is therefore novel over the ' 114 patent. By virtue of their dependency from claim 21 , claims 22-23 are likewise novel over the '114 patent.
The Examiner has also cited U.S. Patent Nos. 5,028,885 ("the '885 patent") and 5,506,863 ("the '863 patent") as being of particular relevance such that the claimed invention cannot be considered to involve an inventive step when the documents are combined with one or more other such documents, such combinations being obvious to a person skilled in the art. It is submitted that the portions of these documents cited by the Examiner no longer render the relevant claims obvious in light ofthe amendments described above.
Applicant believes that the enclosed amendments remove the references cited by the Examiner from being considered as particularly relevant, either taken alone or in combination with one or more such other documents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU71826/98A AU7182698A (en) | 1996-11-14 | 1997-11-13 | Methods and apparatus for synchronization in a wireless network |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/749,105 | 1996-11-14 | ||
| US08/749,105 US6243372B1 (en) | 1996-11-14 | 1996-11-14 | Methods and apparatus for synchronization in a wireless network |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO1998021897A2 WO1998021897A2 (en) | 1998-05-22 |
| WO1998021897A3 WO1998021897A3 (en) | 1998-10-01 |
| WO1998021897B1 true WO1998021897B1 (en) | 1998-11-19 |
Family
ID=25012279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/020659 WO1998021897A2 (en) | 1996-11-14 | 1997-11-13 | Methods and apparatus for synchronization in a wireless network |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US6243372B1 (en) |
| AR (1) | AR010571A1 (en) |
| AU (1) | AU7182698A (en) |
| WO (1) | WO1998021897A2 (en) |
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