US5020056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of synchronous fading effects by time hopping of user slots in TDMA frames
Assignee: Ericsson Inc
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Filing: 1989-05-02
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Granted: 1991-05-28
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Expires: 2009-05-02
Abstract
Abstract A method for the reduction of synchronous fading effects in a time-diversity multiple-access communications system, in which the data to/from a particular user is to appear in a particular assigned slot, varies the position of the time slot assigned to that particular user, so that the slot has a different position in each successive frame in which that assigned slot appears. The position may be set relative to a frame feature, such as its start time and the like. Selected-schedule patterns may be used, with the pattern either being preset at the various stations or being sent to the stations prior to use, as part of a preamble, in-band supervisory signaling and the like.
Inventors
- 👤 Sandeep Chennakeshu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/16; H04J3/1605; H04J3/1623; H04J3/1629; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; H04L; H04L1/00; H04L1/02; H04B1/00; H04B1/69; H04B2001/6908
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A method for reduction of synchronous fading in a TDMA communications system, comprising the steps of: assigning each user to a time slot in which data to or from that user appears; and varying the position of the time slot assigned to that particular user to be in a different part of each successive frame.
Claim 2
Independent Claim
55 words
A method for reduction of synchronous fading in a TDMA communications system, comprising the steps of: assigning each user to a time slot in which data to or from that user appears; and varying the position of the time slot assigned to that particular user to be in a different part of each successive frame.
Claim 3
Dependent Claim
26 words
The method of claim 1, wherein the part of the frame in which the particular user time slot appears is varied according to a predetermined pattern.
Claim 4
Dependent Claim
13 words
The method of claim 2, wherein the pattern is a selected schedule pattern.
Claim 5
Dependent Claim
14 words
The method of claim 2, wherein the pattern is preset into the user station.
Claim 6
Dependent Claim
23 words
The method of claim 2, wherein the pattern is sent to the user station as slow associated control channel data prior to use.
Claim 7
Dependent Claim
16 words
The method of claim 2, wherein the pattern is sent as part of a slot preamble.
Claim 8
Dependent Claim
20 words
The method of claim 2, wherein the pattern is sent to the user station as fast associated control channel data.
Claim 9
Dependent Claim
27 words
The method of claim 2, wherein the pattern is selected to reduce the probability of the same time slot being subjected to synchronous fading in successive frames.
References Cited (Backward Citations)
US3499995A
Cited
US4215244A
Cited
US4686670A
Cited
US4641304A
Cited
US4745599A
Cited
US4785450A
Cited
US4785450B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |