US5038342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
TDM/FDM communication system supporting both TDM and FDM-only communication units
Assignee: Motorola Solutions Inc
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Filing: 1989-01-23
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Granted: 1991-08-06
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Expires: 2009-01-23
Abstract
Abstract An RF communications system that can determine when a requesting subscriber unit comprises a TDM capable unit, and when it doesn't. Channel assignments are based upon this determination. The system also includes repeaters that can translate communications in a TDM format as transmitted by a TDM capable unit into non-TDM format for subsequent transmission to a non-TDM capable unit, and vice versa.
Inventors
- 👤 Kenneth J. Crisler
- 👤 Lawrence M. Mohl
- 👤 Michael D. Kotzin
- 👤 Anthony P. van den Heuvel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:42
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/04; H04W72/044; H04J; H04J4/00; H04W84/00; H04W84/02; H04W84/04; H04W84/08; H04W16/00; H04W16/24; H04W16/26; H04W4/00; H04W4/18; H04W74/00; H04W74/02; H04W84/042; H04W84/047
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
152 words
In a radio communication system having a plurality of communication channels, and further including a plurality of communication units, at least some but not all of which are capable of time division multiplexed (TDM) communications, a method of assigning communications resources to a communication unit, comprising the steps of: (A) determining that a communication unit requires communication resources; (B) determining whether said communication unit comprises a TDM capable communication unit, wherein the step of determining whether said communication unit comprises a TDM capable communication unit includes the step of examining an ID code for said communication unit; (C) when said communication unit comprises a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting time division multiplexed communications; and (D) when said communication unit does not comprise a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting non-time division multiplexed communications.
Claim 2
Dependent Claim
152 words
In a radio communication system having a plurality of communication channels, and further including a plurality of communication units, at least some but not all of which are capable of time division multiplexed (TDM) communications, a method of assigning communications resources to a communication unit, comprising the steps of: (A) determining that a communication unit requires communication resources; (B) determining whether said communication unit comprises a TDM capable communication unit, wherein the step of determining whether said communication unit comprises a TDM capable communication unit includes the step of examining an ID code for said communication unit; (C) when said communication unit comprises a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting time division multiplexed communications; and (D) when said communication unit does not comprise a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting non-time division multiplexed communications.
Claim 3
Dependent Claim
50 words
The method of claim 1, wherein the step of assigning said communication unit to a communication channel that is supporting non-time division multiplexed communications includes the step of assigning said communication unit to any of a plurality of frequency division multiplexed channels that are each supporting non-time division multiplexed communications.
Claim 4
Dependent Claim
36 words
The method of claim 1, wherein the step of determining that a communication unit requires communication resources includes the step of determining that the communication unit requires communication resources to support transmission of a voice message.
Claim 5
Dependent Claim
34 words
The method of claim 1, wherein the step of determining that a communication unit requires communication resources includes the step of determining that the communication unit resources of support transmission of a data message.
Claim 6
Dependent Claim
98 words
The method of claim 1, wherein the radio communication system includes a central controller, and; the step of determining that a communication unit requires communications resources includes the step of receiving, at the central controller, a communication resource assignment request from a communication unit; the step of assigning a communication channel that is supporting time division multiplexed communications includes the step of sourcing, from the central controller, a communication resource assignment; the step of assigning a communication channel that is supporting non-time division multiplexed communications includes the step of sourcing, from the central controller, a communication resource assignment.
Claim 7
Dependent Claim
37 words
The method of claim 1, wherein the step of examining an ID code includes the step of obtaining the ID code from a communication resource assignment request as transmitted by the communication unit that requires communications resources.
Claim 8
Dependent Claim
23 words
The method of claim 1, wherein the radio communication system maintains both a TDM format control channel and a non-TDM format control channel.
Claim 9
Dependent Claim
43 words
The method of claim 7, wherein the step of determining that a communication unit requires communications resources includes the step of receiving a communications resource assignment request on at least one of the TDM format control channel and the non-TDM format control channel.
Claim 10
Dependent Claim
15 words
The method of claim 8, wherein the communications resource assignment request includes the ID code.
Claim 11
Dependent Claim
30 words
The method of claim 1, wherein the step of examining an ID code for said communication unit includes the step of comparing the ID code against look up table information.
Claim 12
Dependent Claim
156 words
In a radio communication system having a plurality of communication channels, and further including a plurality of communication units, at least some but not all of which are capable of time division multiplexed (TDM) communications, a method of assigning communications resources to a communication unit, comprising the steps of: (A) determining that a communication unit requires communication resources; (B) determining whether said communication unit comprises a TDM capable communication unit, wherein the step of determining whether said communication unit comprises a TDM capable communication unit includes the step of examining data transmitted by said communication unit on a system control channel; (C) when said communication unit comprises a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting time division multiplexed communications; and (D) when said communication unit does not comprise a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting non-time division multiplexed communications.
Claim 13
Dependent Claim
156 words
In a radio communication system having a plurality of communication channels, and further including a plurality of communication units, at least some but not all of which are capable of time division multiplexed (TDM) communications, a method of assigning communications resources to a communication unit, comprising the steps of: (A) determining that a communication unit requires communication resources; (B) determining whether said communication unit comprises a TDM capable communication unit, wherein the step of determining whether said communication unit comprises a TDM capable communication unit includes the step of examining data transmitted by said communication unit on a system control channel; (C) when said communication unit comprises a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting time division multiplexed communications; and (D) when said communication unit does not comprise a TDM capable communication unit, assigning said communication unit to a communication channel that is supporting non-time division multiplexed communications.
Claim 14
Dependent Claim
50 words
The method of claim 11, wherein the step of assigning said communication unit to a communication channel that is supporting non-time division multiplexed communications includes the step of assigning said communication unit to any of a plurality of frequency division multiplexed channels that are each supporting non-time division multiplexed communications.
Claim 15
Dependent Claim
36 words
The method of claim 11, wherein the step of determining that a communication unit requires communication resources includes the step of determining that the communication unit requires communication resources to support transmission of a voice message.
Claim 16
Dependent Claim
36 words
The method of claim 11, wherein the step of determining that a communication unit requires communication resources includes the step of determining that the communication unit requires communication resources to support transmission of a data message.
Claim 17
Dependent Claim
98 words
The method of claim 11, wherein the radio communication system includes a central controller, and: the step of determining that a communication unit requires communications resources includes the step of receiving, at the central controller, a communication resource assignment request from a communication unit; the step of assigning a communication channel that is supporting time division multiplexed communications includes the step of sourcing, from the central controller, a communication resource assignment; the step of assigning a communication channel that is supporting non-time division multiplexed communications includes the step of sourcing, from the central controller, a communication resource assignment.
Claim 18
Dependent Claim
35 words
The method of claim 11, wherein the step of examining the data includes the step of obtaining the data from a communication resource assignment request as transmitted by the communication unit that requires communications resources.
Claim 19
Dependent Claim
23 words
The method of claim 11, wherein the radio communication system maintains both a TDM format control channel and a non-TDM format control channel.
Claim 20
Dependent Claim
43 words
The method of claim 17, wherein the step of determining that a communication unit requires communications resources includes the step of receiving a communications resource assignment request on at least one of the TDM format control channel and the non-TDM format control channel.
Claim 21
Dependent Claim
14 words
The method of claim 18, wherein the communications resource assignment request includes the data.
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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) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |