US5481533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid intra-cell TDMA/inter-cell CDMA for wireless networks
Assignee: Intel Corp
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Filing: 1994-05-12
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Granted: 1996-01-02
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Expires: 2014-05-12
Abstract
Abstract In a cellular network, a multiple-access methodology and concomitant circuitry in which TDMA is used inside each cell and CDMA signals, having pulse shapes with low cross-correlations, are assigned to adjacent cells. For example, these pulses could be Direct-Sequence Spread-Spectrum pulses. Such a hybrid system combines the high intra-cell capacity of TDMA with the inter-cell and multipath interference rejection capabilities of CDMA.
Inventors
- 👤 Michael L. Honig
- 👤 Upamanyu Madhow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:25
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/16; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2618
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
281 words
A method for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the method comprising the steps of generating TDMA time slots in each of the base stations and the mobile units, synchronizing the TDMA time slots generated in the base stations and the mobile units by propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, assigning a CDMA code from a set of CDMA codes to each cell, assigning each of the mobile units to one of the TDMA time slots, for downlink communication from an uplink base station to a downlink mobile unit, sending an outgoing information signal from the office to the uplink base station, converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, and propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, for uplink communication from a downlink mobile unit to an uplink base station, converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 2
Independent Claim
281 words
A method for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the method comprising the steps of generating TDMA time slots in each of the base stations and the mobile units, synchronizing the TDMA time slots generated in the base stations and the mobile units by propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, assigning a CDMA code from a set of CDMA codes to each cell, assigning each of the mobile units to one of the TDMA time slots, for downlink communication from an uplink base station to a downlink mobile unit, sending an outgoing information signal from the office to the uplink base station, converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, and propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, for uplink communication from a downlink mobile unit to an uplink base station, converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 3
Dependent Claim
16 words
The method as recited in claim 1 wherein the CDMA codes correspond to Direct-Sequence, Spread-Spectrum (DS-SS)signals.
Claim 4
Dependent Claim
30 words
The method as recited in claim 1 further comprising the step of detecting the incoming CDMA coded signal and the outgoing CDMA coded signal each with a matched filter receiver.
Claim 5
Dependent Claim
29 words
The method as recited in claim 1 further comprising the step of detecting the incoming CDMA coded signal and the outgoing CDMA coded signal each with an interference-suppression receiver.
Claim 6
Dependent Claim
50 words
The method as recited in claim 1 further comprising the step of transmitting an identifier of the CDMA code assigned to each cell from each of the base stations to corresponding ones of the mobile units served by each of the base stations in one of the TDMA time slots.
Claim 7
Independent Claim
319 words
A method for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the method comprising the steps of generating TDMA time slots in each of the base stations and the mobile units, synchronizing the TDMA time slots generated in the base stations and the mobile units by propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, assigning a CDMA code from a set of CDMA codes to each cell, transmitting an identifier of the CDMA code assigned to each cell from each of the base stations to corresponding ones of the mobile units served by each of the base stations in one of the TDMA time slots, assigning each of the mobile units to one of the TDMA time slots, for downlink communication from an uplink base station to a downlink mobile unit, sending an outgoing information signal from the office to the uplink base station, converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, and propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, for uplink communication from a downlink mobile unit to an uplink base station, converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 8
Independent Claim
319 words
A method for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the method comprising the steps of generating TDMA time slots in each of the base stations and the mobile units, synchronizing the TDMA time slots generated in the base stations and the mobile units by propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, assigning a CDMA code from a set of CDMA codes to each cell, transmitting an identifier of the CDMA code assigned to each cell from each of the base stations to corresponding ones of the mobile units served by each of the base stations in one of the TDMA time slots, assigning each of the mobile units to one of the TDMA time slots, for downlink communication from an uplink base station to a downlink mobile unit, sending an outgoing information signal from the office to the uplink base station, converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, and propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, for uplink communication from a downlink mobile unit to an uplink base station, converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 9
Dependent Claim
16 words
The method as recited in claim 6 wherein the CDMA codes correspond to Direct-Sequence, Spread-Spectrum (DS-SS)signals.
Claim 10
Dependent Claim
30 words
The method as recited in claim 6 further comprising the step of detecting the incoming CDMA coded signal and the outgoing CDMA coded signal each with a matched filter receiver.
Claim 11
Dependent Claim
29 words
The method as recited in claim 6 further comprising the step of detecting the incoming CDMA coded signal and the outgoing CDMA coded signal each with an interference-suppression receiver.
Claim 12
Dependent Claim
277 words
Circuitry for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the circuitry comprising means for generating TDMA time slots in each of the base stations and the mobile units, means for synchronizing the TDMA time slots generated in the base stations and the mobile units, the means for synchronizing including means for propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, means for assigning a CDMA code from a set of CDMA codes to each cell, means for assigning each of the mobile units to one of the TDMA time slots, means for sending an outgoing information signal from the office to the uplink base station, means for converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, means for propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, means for converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, and means for propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and means for converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 13
Dependent Claim
277 words
Circuitry for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the circuitry comprising means for generating TDMA time slots in each of the base stations and the mobile units, means for synchronizing the TDMA time slots generated in the base stations and the mobile units, the means for synchronizing including means for propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, means for assigning a CDMA code from a set of CDMA codes to each cell, means for assigning each of the mobile units to one of the TDMA time slots, means for sending an outgoing information signal from the office to the uplink base station, means for converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, means for propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, means for converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, and means for propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and means for converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 14
Dependent Claim
17 words
The circuitry as recited in claim 10 wherein the CDMA codes correspond to Direct-Sequence, Spread-Spectrum (DS-SS) signals.
Claim 15
Dependent Claim
40 words
The circuitry as recited in claim 10 further comprising matched filter means in the downlink mobile unit for detecting the outgoing CDMA coded signal and matched filter means in the uplink base station for detecting the incoming CDMA coded signal.
Claim 16
Dependent Claim
42 words
The circuitry as recited in claim 10 further comprising interference suppression filter means in the downlink mobile unit for detecting the outgoing CDMA coded signal and interference suppression filter means in the uplink base station for detecting the incoming CDMA coded signal.
Claim 17
Dependent Claim
46 words
The circuitry as recited in claim 10 further comprising means for transmitting the CDMA code assigned to each cell from each of the base stations to corresponding ones of the mobile units served by each of the base stations in one of the TDMA time slots.
Claim 18
Dependent Claim
306 words
Circuitry for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the circuitry comprising means for generating TDMA time slots in each of the base stations and the mobile units, means for synchronizing the TDMA time slots generated in the base stations and the mobile units, the means for synchronizing including means for propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, means for assigning a CDMA code from a set of CDMA codes to each cell, means for transmitting the CDMA code assigned to each cell from each of the base stations to corresponding ones of the mobile units served by each of the base stations, means for assigning each of the mobile units to one of the TDMA time slots, means for sending an outgoing information signal from the office to the uplink base station, means for converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, means for propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, means for converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, means for propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and means for converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 19
Dependent Claim
306 words
Circuitry for communicating in a cellular communication network composed of a plurality of base stations homing on a central switching office, each of the base stations serving a plurality of mobile units, the circuitry comprising means for generating TDMA time slots in each of the base stations and the mobile units, means for synchronizing the TDMA time slots generated in the base stations and the mobile units, the means for synchronizing including means for propagating a synch signal from the office to each of the base stations and, in turn, to the corresponding mobile units, means for assigning a CDMA code from a set of CDMA codes to each cell, means for transmitting the CDMA code assigned to each cell from each of the base stations to corresponding ones of the mobile units served by each of the base stations, means for assigning each of the mobile units to one of the TDMA time slots, means for sending an outgoing information signal from the office to the uplink base station, means for converting the outgoing information signal in the uplink base station to an outgoing CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, means for propagating the outgoing CDMA coded signal to the downlink mobile unit in the TDMA time slot assigned to the downlink mobile unit, means for converting an incoming information signal in the downlink mobile unit to an incoming CDMA coded signal corresponding to the CDMA code assigned to the cell containing the uplink base station, means for propagating the incoming CDMA coded signal to the uplink base station in the TDMA time slot assigned to the downlink mobile unit, and means for converting the incoming CDMA coded signal in the uplink base station to an incoming information signal for transmission to the office.
Claim 20
Dependent Claim
17 words
The circuitry as recited in claim 15 wherein the CDMA codes correspond to Direct-Sequence, Spread-Spectrum (DS-SS) signals.
Claim 21
Dependent Claim
40 words
The circuitry as recited in claim 15 further comprising matched filter means in the downlink mobile unit for detecting the outgoing CDMA coded signal and matched filter means in the uplink base station for detecting the incoming CDMA coded signal.
Claim 22
Dependent Claim
42 words
The circuitry as recited in claim 15 further comprising interference suppression filter means in the downlink mobile unit for detecting the outgoing CDMA coded signal and interference suppression filter means in the uplink base station for detecting the incoming CDMA coded signal.
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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) | 1999-01-01 | 1999-07-03 | 2000-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-01 | 2003-07-03 | 2004-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-01 | 2007-07-03 | 2008-01-02 | $7700.00 | Window Closed / Lapsed |