Patent US4713809A successfully refreshed from Google Patents.
US4713809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time division multiple access radio communications system
Assignee: NEC Corp
•
Filing: 1986-07-21
•
Granted: 1987-12-15
•
Expires: 2006-07-21
Abstract
Abstract In a time division multiple access radio communication system constituted by a plurality of repeater stations and a plurality of terminals, only when the time slot in both the upward and downward directions is identical in a repeater station, the repeater station repeats data in the time slot. Downward data of a time slot used by a subscriber in an upward zone is not repeated to downward repeater stations, thereby saving power.
Inventors
- 👤 Yasuhiro Mizota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:51
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A time division multiple access radio communication system comprising: one base station; a plurality of repeater stations for sequentially repeating a radio signal received by and transmitted from said base station; and a plurality of terminals for communicating the radio signal with said base station via said repeater stations, each of said repeater stations including repeater means for repeating the radio signal using a time slot assigned to each of said terminals, wherein each of said repeater stations further comprises means for detecting a time slot in upward communication, and means for activating said repeater means in association with only a time slot in downward communication corresponding to the detected time slot in upward communication.
Claim 2
Dependent Claim
115 words
A time division multiple access radio communication system comprising: one base station; a plurality of repeater stations for sequentially repeating a radio signal received by and transmitted from said base station; and a plurality of terminals for communicating the radio signal with said base station via said repeater stations, each of said repeater stations including repeater means for repeating the radio signal using a time slot assigned to each of said terminals, wherein each of said repeater stations further comprises means for detecting a time slot in upward communication, and means for activating said repeater means in association with only a time slot in downward communication corresponding to the detected time slot in upward communication.
Claim 3
Dependent Claim
54 words
A system according to claim 1, wherein said repeater means comprises memory means for storing upward and downward reception signals; means for detecting a time slot in use; means for controlling a readout operation of said memory means corresponding to the detected time slot; and means for transmitting the output from said memory means.
Claim 4
Dependent Claim
58 words
A system according to claim 2, wherein said means for activating said repeater means comprises a timing circuit for generating a control signal in accordance with the output from said time slot detecting means for detecting a time slot in upward communication, and means for enabling the output from said memory means in accordance with the control signal.
Claim 5
Dependent Claim
24 words
A system according to claim 2, wherein said time slot detecting means includes a circuit for detecting a start code of each time slot.
Claim 6
Dependent Claim
19 words
A system according to claim 2, wherein said memory means includes a random-access memory provided for each time slot.
Claim 7
Dependent Claim
32 words
A system according to claim 3, wherein said means for enabling the output from said memory means includes an AND circuit which receives the output from said timing circuit as one input.
References Cited (Backward Citations)
US4380816A
Cited
US4490818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |