Patent US5696766A successfully refreshed from Google Patents.
US5696766A
Expired / Lapsed
US
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Apparatus and method of synchronizing a transmitter in a subscriber terminal of a wireless telecommunications system
Assignee: Airspan Networks Inc
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Filing: 1995-11-16
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Granted: 1997-12-09
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Expires: 2015-11-16
Abstract
Abstract A wireless telecommunications system (1) includes a central terminal (10) for transmitting and receiving radio frequency signals to and from a subscriber terminal (20). A downlink communication path is established from a transmitter (200) of the central terminal (10) to a receiver (202) of the subscriber terminal (20). A downlink signal (212) is transmitted from the transmitter (200) to the receiver (202) during setup and operation of the wireless telecommunications system (1). The downlink signal (212) includes an overhead channel (224) having a code synchronization signal (234). The code synchronization signal (234) is capable of adjusting a phase of a transmitter (204) in the subscriber terminal (20). A receiver (206) in the central terminal (10) monitors an uplink signal (214) transmitted by the transmitter (204) in the subscriber terminal and provides changes to the code synchronization signal (234) such that the transmitter (204) is synchronized to the receiver (206). Synchronization of the transmitter (204) in the subscriber terminal (20) to the receiver (206) in the central terminal (10) facilitates establishment of an uplink communication path from the subscriber terminal (20) to the central terminal (10).
Inventors
- 👤 Joemmane Chi Cheung Yeung
- 👤 Ian L. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:34
CPC Classifications
H; H04; H04W; H04W56/00; G; G06; G06F; G06F9/00; G06F9/06; G06F9/46; G06F9/54; G06F9/546; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; H04B1/7077; H04B1/7085; H04J; H04J13/00; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0682; H04L; H04L12/00; H04L12/66; H04L41/00; H04L41/02; H04L41/0226; H04L41/0233; H04L41/08; H04L41/0803; H04L41/0813; H04L41/0816; H04L41/22; H04L43/00; H04L69/00; H04L69/14; H04L9/00; H04L9/06; H04L9/065; H04L9/12; H04L9/40; H04Q; H04Q11/00; H04Q11/04; H04W52/00; H04W52/04; H04W52/18; H04W52/24; H04W52/52; H04B1/70735; H04B1/70775; H04B2001/70706; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70702; H04B2201/70706; H04B2201/70707; H04B2201/7071; H04B2201/70711; H04B2201/7097; H04B2201/709709; H04L2209/00; H04L2209/80; H04L69/08; H04Q2213/00; H04Q2213/1305; H04Q2213/13093; H04Q2213/13098; H04Q2213/13109; H04Q2213/1319; H04Q2213/13196; H04Q2213/13199; H04Q2213/13202; H04Q2213/13204; H04Q2213/13216; H04Q2213/13292; H04Q2213/13296; H04Q2213/13298; H04Q2213/13299; H04Q2213/13335; H04Q2213/13376; H04W52/06; H04W52/08; H04W84/00; H04W84/02; H04W84/10; H04W84/14
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
134 words
A method of synchronizing a transmitter in a subscriber terminal of a wireless telecommunications system, comprising the steps of: establishing a downlink communication path from a central terminal to the subscriber terminal; transmitting from a transmitter in the central terminal a downlink signal; receiving at a receiver in the subscriber terminal the downlink signal; identifying a code synchronization signal within the downlink signal; comparing a code and phase of the code synchronization signal with a code and a phase of a slave code sequence in the subscriber terminal; adjusting the phase of the slave code sequence to match the phase of the code synchronization signal; establishing an uplink communication path in response to the phase of the transmitter in the subscriber terminal being equivalent to a phase of a receiver in the central terminal.
Claim 2
Independent Claim
134 words
A method of synchronizing a transmitter in a subscriber terminal of a wireless telecommunications system, comprising the steps of: establishing a downlink communication path from a central terminal to the subscriber terminal; transmitting from a transmitter in the central terminal a downlink signal; receiving at a receiver in the subscriber terminal the downlink signal; identifying a code synchronization signal within the downlink signal; comparing a code and phase of the code synchronization signal with a code and a phase of a slave code sequence in the subscriber terminal; adjusting the phase of the slave code sequence to match the phase of the code synchronization signal; establishing an uplink communication path in response to the phase of the transmitter in the subscriber terminal being equivalent to a phase of a receiver in the central terminal.
Claim 3
Dependent Claim
33 words
The method of claim 1, wherein the code synchronization signal adjusts the phase of the transmitter in the subscriber terminal in a coarse adjustment mode having one half increments of a chip period.
Claim 4
Dependent Claim
28 words
The method of claim 2, wherein the code synchronization signal adjusts the phase of the transmitter in the subscriber terminal either forward or backward in one half increments.
Claim 5
Independent Claim
199 words
A method of synchronizing a transmitter in a subscriber terminal of a wireless telecommunications system, comprising the steps of: establishing a downlink communication path from a central terminal to the subscriber terminal; transmitting from a transmitter in the central terminal a downlink signal; receiving at a receiver in the subscriber terminal the downlink signal identifying a code synchronization signal within the downlink signal; adjusting a phase of the transmitter in the subscriber terminal in response to the code synchronization signal; establishing an uplink communication path in response to the phase of the transmitter in the subscriber terminal being equivalent to a phase of a receiver in the central terminal; transmitting an uplink signal from the transmitter in the subscriber terminal; receiving the uplink signal at the receiver in the central terminal; comparing a phase of the uplink signal to a phase of the receiver in the central terminal; transmitting the code synchronization signal in response to the phase of the uplink signal not matching the phase of the receiver in the central terminal, the code synchronization signal having a value indicating that a further adjustment is to be made to the phase of the transmitter in the subscriber terminal.
Claim 6
Independent Claim
199 words
A method of synchronizing a transmitter in a subscriber terminal of a wireless telecommunications system, comprising the steps of: establishing a downlink communication path from a central terminal to the subscriber terminal; transmitting from a transmitter in the central terminal a downlink signal; receiving at a receiver in the subscriber terminal the downlink signal identifying a code synchronization signal within the downlink signal; adjusting a phase of the transmitter in the subscriber terminal in response to the code synchronization signal; establishing an uplink communication path in response to the phase of the transmitter in the subscriber terminal being equivalent to a phase of a receiver in the central terminal; transmitting an uplink signal from the transmitter in the subscriber terminal; receiving the uplink signal at the receiver in the central terminal; comparing a phase of the uplink signal to a phase of the receiver in the central terminal; transmitting the code synchronization signal in response to the phase of the uplink signal not matching the phase of the receiver in the central terminal, the code synchronization signal having a value indicating that a further adjustment is to be made to the phase of the transmitter in the subscriber terminal.
Claim 7
Dependent Claim
59 words
The method of claim 4, wherein the comparing step includes measuring a combined power of the phase of the uplink signal and the phase of the receiver in the central terminal and determining a maximum combined power value that indicates a match between the phase of the uplink signal and the phase of the receiver in the central terminal.
Claim 8
Dependent Claim
30 words
A method according to claim 5, wherein the step of measuring combined power comprises performing a correlation operation between PN codes of an uplink signal and a receiver reference signal.
Claim 9
Dependent Claim
118 words
The method of claim 5, further comprising the steps of: receiving the uplink signal at the receiver in the central terminal in phase with a phase of the receiver in the central terminal, receipt of the uplink signal matching the phase of the receiver in the central terminal indicating that a phase delay between the transmitter in the subscriber terminal and the receiver in the central terminal has been determined, determination of the phase delay indicating that an uplink communication path has been established from the subscriber terminal to the central terminal; and transmitting the code synchronization signal having a value indicating that no further adjustments are needed to the phase of the transmitter in the subscriber terminal.
Claim 10
Dependent Claim
85 words
The method of claim 7, further comprising the steps of: continuously comparing the phase of the uplink signal from the transmitter of the subscriber terminal to the phase of the receiver in the central terminal; transmitting the code synchronization signal having a value indicating that a slight readjustment is to be made to the phase of the transmitter in the subscriber terminal in response to a change in the path delay between the transmitter in the subscriber terminal and the receiver in the central terminal.
Claim 11
Dependent Claim
55 words
The method of claim 8, wherein the code synchronization signal adjusts the phase of the transmitter in the subscriber terminal in a fine adjustment mode having one sixteenth increments of a chip period in response to changes in the path delay between the transmitter in the subscriber terminal and the receiver in the central terminal.
Claim 12
Dependent Claim
28 words
The method of claim 9, wherein the code synchronization signal adjusts the phase of the transmitter in the subscriber unit either forward or backward by one sixteenth increments.
Claim 13
Independent Claim
156 words
A method of synchronizing a transmitter in a subscriber terminal of a wireless telecommunications system, comprising the steps of: establishing a downlink communication path from a central terminal to the subscriber terminal; transmitting from a transmitter in the central terminal a downlink signal; receiving at a receiver in the subscriber terminal the downlink signal identifying a code synchronization signal within the downlink signal; adjusting a phase of the transmitter in the subscriber terminal in response to the code synchronization signal; establishing an uplink communication path in response to the phase of the transmitter in the subscriber terminal being equivalent to a phase of a receiver in the central terminal; monitoring the uplink communication path from the subscriber terminal to the central terminal; resetting the phase of the transmitter in the subscriber terminal to a previous value in response to an interruption in the uplink communication path in order to facilitate reestablishment of the uplink communication path.
Claim 14
Independent Claim
156 words
A method of synchronizing a transmitter in a subscriber terminal of a wireless telecommunications system, comprising the steps of: establishing a downlink communication path from a central terminal to the subscriber terminal; transmitting from a transmitter in the central terminal a downlink signal; receiving at a receiver in the subscriber terminal the downlink signal identifying a code synchronization signal within the downlink signal; adjusting a phase of the transmitter in the subscriber terminal in response to the code synchronization signal; establishing an uplink communication path in response to the phase of the transmitter in the subscriber terminal being equivalent to a phase of a receiver in the central terminal; monitoring the uplink communication path from the subscriber terminal to the central terminal; resetting the phase of the transmitter in the subscriber terminal to a previous value in response to an interruption in the uplink communication path in order to facilitate reestablishment of the uplink communication path.
Claim 15
Dependent Claim
20 words
The method of claim 1, wherein the code synchronization signal is decoded within an overhead channel of the downlink signal.
Claim 16
Dependent Claim
23 words
The method of claim 12, wherein the overhead channel is decoded in one bit of every ten bit positions of the downlink signal.
Claim 17
Independent Claim
238 words
A system for synchronizing communications in a wireless communications system, comprising: a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a code synchronization signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver in the subscriber terminal operable to extract the code synchronization signal from the downlink signal, the receiver operable to compare a code and phase of the code synchronization signal with a code and phase of a slave code sequence corresponding to the receiver, the receiver operable to adjust the phase of the slave code sequence such that the slave code sequence matches the phase of the code synchronization signal; a transmitter in the subscriber terminal operable to transmit an uplink signal, the transmitter in the subscriber terminal operable to receive the code synchronization signal from the receiver in the subscriber terminal, the code synchronization signal operable to adjust a phase of the uplink signal; a receiver in the central terminal operable to receive the uplink signal, the receiver in the subscriber terminal operable to compare its receiver phase to the phase of the uplink signal to determine a match between the receiver phase and the phase of the uplink signal, the receiver in the subscriber terminal operable to set a value for the code synchronization signal in order to obtain a match of the phase of the uplink signal to the receiver phase.
Claim 18
Independent Claim
238 words
A system for synchronizing communications in a wireless communications system, comprising: a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a code synchronization signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver in the subscriber terminal operable to extract the code synchronization signal from the downlink signal, the receiver operable to compare a code and phase of the code synchronization signal with a code and phase of a slave code sequence corresponding to the receiver, the receiver operable to adjust the phase of the slave code sequence such that the slave code sequence matches the phase of the code synchronization signal; a transmitter in the subscriber terminal operable to transmit an uplink signal, the transmitter in the subscriber terminal operable to receive the code synchronization signal from the receiver in the subscriber terminal, the code synchronization signal operable to adjust a phase of the uplink signal; a receiver in the central terminal operable to receive the uplink signal, the receiver in the subscriber terminal operable to compare its receiver phase to the phase of the uplink signal to determine a match between the receiver phase and the phase of the uplink signal, the receiver in the subscriber terminal operable to set a value for the code synchronization signal in order to obtain a match of the phase of the uplink signal to the receiver phase.
Claim 19
Dependent Claim
20 words
The system of claim 14, wherein the code synchronization signal is decoded within an overhead channel of the downlink signal.
Claim 20
Dependent Claim
23 words
The system of claim 15, wherein the overhead channel is decoded in one bit of every ten bit positions of the downlink signal.
Claim 21
Dependent Claim
35 words
The system of claim 14, wherein the code synchronization signal incrementally adjusts the phase of the uplink signal either forward or backward in a coarse adjustment mode having one half increments of a chip period.
Claim 22
Independent Claim
230 words
A system for synchronizing communications in a wireless communications system, comprising: a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a code synchronization signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver in the subscriber terminal operable to extract the code synchronization signal from the downlink signal; a transmitter in the subscriber terminal operable to transmit an uplink signal, the transmitter in the subscriber terminal operable to receive the code synchronization signal from the receiver in the subscriber terminal, the code synchronization signal operable to adjust a phase of the uplink signal; a receiver in the central terminal operable to receive the uplink signal, the receiver in the subscriber terminal operable to compare its receiver phase to the phase of the uplink signal to determine a match between the receiver phase and the phase of the uplink signal, the receiver in the subscriber terminal operable to set a value for the code synchronization signal in order to obtain a match of the phase of the uplink signal to the receiver phase, wherein the receiver in the central terminal continuously compares the phase of the uplink signal to the receiver phase, the receiver altering the code synchronization signal in response to the comparison to maintain the match between the phase of the uplink signal and the receiver phase.
Claim 23
Independent Claim
230 words
A system for synchronizing communications in a wireless communications system, comprising: a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a code synchronization signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver in the subscriber terminal operable to extract the code synchronization signal from the downlink signal; a transmitter in the subscriber terminal operable to transmit an uplink signal, the transmitter in the subscriber terminal operable to receive the code synchronization signal from the receiver in the subscriber terminal, the code synchronization signal operable to adjust a phase of the uplink signal; a receiver in the central terminal operable to receive the uplink signal, the receiver in the subscriber terminal operable to compare its receiver phase to the phase of the uplink signal to determine a match between the receiver phase and the phase of the uplink signal, the receiver in the subscriber terminal operable to set a value for the code synchronization signal in order to obtain a match of the phase of the uplink signal to the receiver phase, wherein the receiver in the central terminal continuously compares the phase of the uplink signal to the receiver phase, the receiver altering the code synchronization signal in response to the comparison to maintain the match between the phase of the uplink signal and the receiver phase.
Claim 24
Dependent Claim
35 words
The system of claim 18, wherein the code synchronization signal incrementally adjusts the phase of the uplink signal either forward or backward in a fine adjustment mode having one sixteenth increments of a chip period.
Claim 25
Independent Claim
244 words
A system for synchronizing communications in wireless communications system, comprising: a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a code synchronization signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver in the subscriber terminal operable to extract the code synchronization signal from the downlink signal; a transmitter in the subscriber terminal operable to transmit an uplink signal, the transmitter in the subscriber terminal operable to receive the code synchronization signal from the receiver in the subscriber terminal, the code synchronization signal operable to adjust a phase of the uplink signal; a receiver in the central terminal operable to receive the uplink signal, the receiver in the subscriber terminal operable to compare its receiver phase to the phase of the uplink signal to determine a match between the receiver phase and the phase of the uplink signal, the receiver in the subscriber terminal operable to set a value for the code synchronization signal in order to obtain a match of the phase of the uplink signal to the receiver phase, wherein the receiver in the central terminal measures a combined power of the phase of the uplink signal and the phase of the receiver in the central terminal, the receiver in the central terminal determining a maximum combined power value that indicates a match between the phase of the uplink signal and the phase of the receiver in the central terminal.
Claim 26
Independent Claim
244 words
A system for synchronizing communications in wireless communications system, comprising: a transmitter in a central terminal operable to transmit a downlink signal, the downlink signal including a code synchronization signal; a receiver in a subscriber terminal operable to receive the downlink signal, the receiver in the subscriber terminal operable to extract the code synchronization signal from the downlink signal; a transmitter in the subscriber terminal operable to transmit an uplink signal, the transmitter in the subscriber terminal operable to receive the code synchronization signal from the receiver in the subscriber terminal, the code synchronization signal operable to adjust a phase of the uplink signal; a receiver in the central terminal operable to receive the uplink signal, the receiver in the subscriber terminal operable to compare its receiver phase to the phase of the uplink signal to determine a match between the receiver phase and the phase of the uplink signal, the receiver in the subscriber terminal operable to set a value for the code synchronization signal in order to obtain a match of the phase of the uplink signal to the receiver phase, wherein the receiver in the central terminal measures a combined power of the phase of the uplink signal and the phase of the receiver in the central terminal, the receiver in the central terminal determining a maximum combined power value that indicates a match between the phase of the uplink signal and the phase of the receiver in the central terminal.
Claim 27
Dependent Claim
122 words
A subscriber terminal in a wireless telecommunications system, comprising: a receiver operable to receive a downlink signal, the downlink signal including a code synchronization signal, the receiver operable to extract the code synchronization signal from the downlink signal, the receiver operable to compare a code and phase of the code synchronization signal with a code and phase of a slave code sequence corresponding to the receiver, the receiver operable to adjust the phase of the slave code sequence such that the slave code sequence matches the phase of the code synchronization signal; a transmitter operable to transmit an uplink signal, the transmitter operable to receive the code synchronization signal, the code synchronization signal operable to adjust a phase of the uplink signal.
Claim 28
Dependent Claim
122 words
A subscriber terminal in a wireless telecommunications system, comprising: a receiver operable to receive a downlink signal, the downlink signal including a code synchronization signal, the receiver operable to extract the code synchronization signal from the downlink signal, the receiver operable to compare a code and phase of the code synchronization signal with a code and phase of a slave code sequence corresponding to the receiver, the receiver operable to adjust the phase of the slave code sequence such that the slave code sequence matches the phase of the code synchronization signal; a transmitter operable to transmit an uplink signal, the transmitter operable to receive the code synchronization signal, the code synchronization signal operable to adjust a phase of the uplink signal.
Claim 29
Dependent Claim
21 words
The subscriber terminal of claim 21, wherein the code synchronization signal is decoded within an overhead channel of the downlink signal.
Claim 30
Dependent Claim
24 words
The subscriber terminal of claim 22, wherein the overhead channel is decoded into one bit of every ten bit positions of the downlink signal.
Claim 31
Dependent Claim
36 words
The subscriber terminal of claim 21, wherein the code synchronization signal incrementally adjusts the phase of the uplink signal either forward or backward in a coarse adjustment mode having one half increments of a chip period.
Claim 32
Dependent Claim
36 words
The subscriber terminal of claim 21, wherein the code synchronization signal incrementally adjusts the phase of the uplink signal either forward or backward in a fine adjustment mode having one sixteenth increments of a chip period.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-08 | 2001-06-09 | 2001-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-08 | 2005-06-09 | 2005-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-08 | 2009-06-09 | 2009-12-09 | $7700.00 | Window Closed / Lapsed |