US5668804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Base station with time-aligned mobile transmitting moments according to distance to base station
Assignee: Nokia Solutions and Networks Oy
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Filing: 1994-06-29
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Granted: 1997-09-16
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Expires: 2014-06-29
Abstract
Abstract For increasing the radius of the effective service area of a base station in a digital time division multiple access (TDMA) radio network, a first transceiver is provided for communicating with mobile radio stations only within a radially outer annular region, and a second transceiver is provided for communicating with the mobile radio stations within a central region a radially outer marginal portion of which overlaps with a radially inner marginal portion of the outer annular region. Timing offsets between transmissions from the base station transceivers and transmissions from the mobile stations being such that respective transmissions are received within proper time slots despite that the outer radius of radially outer annular region would necessitate a larger than workable time delay were the first transceiver used by itself for serving the entire radial extent of the respective composite effective coverage areas of the first and second transceivers.
Inventors
- 👤 Jukka Suonvieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:30
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/24; H04W16/26; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0682; H04W56/00; H04W56/004; H04W56/0045; H04W56/0055; H04W56/0065; H04W88/00; H04W88/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
231 words
A base station for a digital time division multiple access (TDMA) radio network, the base station comprising: a radio transceiver, means for measuring a time difference between the transmissions of the transceiver and a mobile radio station due to a distance between the base station and the mobile radio station, means for controlling the mobile radio station to adjust its transmission relative to the transmission of the transceiver by a predetermined timing advance compensating for said time difference, said timing advance having a maximum value determining a maximum radius r MAX for an effective service area of the base station transceiver, means for providing a timing offset between the reception and the transmission of the transceiver in a manner that the maximum radius of the service area of the transceiver is r 1 +r MAX , and the service area has a central area which has a radius r 1 and within which the transceiver is not capable of providing services to mobile radio stations, where r 1 is directly proportional to said timing offset, and a second radio transceiver where the timing between reception and transmission is normal and the outer radius of the service area of which is at a distance r MAX from the base station, said offset between transmission and reception being selected so that the service areas of the first-mentioned transceiver and the second transceiver overlap.
Claim 2
Dependent Claim
231 words
A base station for a digital time division multiple access (TDMA) radio network, the base station comprising: a radio transceiver, means for measuring a time difference between the transmissions of the transceiver and a mobile radio station due to a distance between the base station and the mobile radio station, means for controlling the mobile radio station to adjust its transmission relative to the transmission of the transceiver by a predetermined timing advance compensating for said time difference, said timing advance having a maximum value determining a maximum radius r MAX for an effective service area of the base station transceiver, means for providing a timing offset between the reception and the transmission of the transceiver in a manner that the maximum radius of the service area of the transceiver is r 1 +r MAX , and the service area has a central area which has a radius r 1 and within which the transceiver is not capable of providing services to mobile radio stations, where r 1 is directly proportional to said timing offset, and a second radio transceiver where the timing between reception and transmission is normal and the outer radius of the service area of which is at a distance r MAX from the base station, said offset between transmission and reception being selected so that the service areas of the first-mentioned transceiver and the second transceiver overlap.
Claim 3
Dependent Claim
31 words
A base station according to claim 1, wherein: said timing offset dT between the reception and transmission is calculated from the equation dT=r.sub.1 /C, where C is the velocity of light.
Claim 4
Dependent Claim
18 words
The base station according to claim 1, wherein: said timing offset between the reception and transmission is variable.
Claim 5
Dependent Claim
17 words
The base station according to claim 1, wherein the service area of the first-mentioned transceiver is ring-shaped.
Claim 6
Dependent Claim
28 words
The base station according to claim 1, wherein: the first-mentioned transceiver has a directional antenna and an elongated service area in a certain direction from the base station.
Claim 7
Dependent Claim
65 words
The base station according to claim 5, wherein: the base station comprises another transceiver where the timing of reception is delayed relative to transmission by a predetermined delay, and that said first-mentioned transceiver has a directional antenna and an elongated service area in a direction away from the base station, which direction is different from the direction of the service area of the first-mentioned transceiver.
Claim 8
Dependent Claim
18 words
The base station according to claim 6, wherein: service areas of the transceivers cover a long road section.
Claim 9
Dependent Claim
37 words
The base station according to claim 1, including: means for performing the internal handover of the base station, when a mobile radio station moves from one service area of the base station to the other service area.
Claim 10
Dependent Claim
26 words
The base station according to claim 8, wherein: said handover means perform the handover on the basis of the timing advance of the mobile radio station.
Claim 11
Dependent Claim
36 words
The base station according to claim 9, wherein: said handover means perform a handover when the timing advance of a mobile radio station located within the service area of the second transceiver exceeds a predetermined value.
Claim 12
Dependent Claim
37 words
The base station according to claim 8, wherein: said handover means perform a handover when the timing advance of a mobile radio station located within the service area of the first-mentioned transceiver falls below a predetermined value.
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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) | 2000-09-15 | 2001-03-17 | 2001-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-15 | 2005-03-17 | 2005-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-15 | 2009-03-17 | 2009-09-16 | $7700.00 | Window Closed / Lapsed |