EP0412583A2
Expired / Lapsed
EP
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Method and apparatus for controlling a TDM communication device
Assignee: Motorola Solutions Inc
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Filing: 1986-03-25
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Granted: —
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Expires: 2006-03-25
Abstract
Abstract A time division multiplexed (TDM) communication device controller is disclosed, which controis all signalling, synchronization and supervisory functions. In one embodiment, the invention operates to control a remote communication device having a vo-coder and buffering means. The remote communication device is enabled to operate as a dispatch, full duplex or a combination dispatch/full duplex communication device. In another embodiment, a primary station (repeater) is controlled to operate as a single frequency repeater (SFR) or as a multi-frequency TDM repeater.
Inventors
- 👤 Steven H. Goode
- 👤 Henry L. Kazecki
- 👤 James C. Baker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:21
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/08; G; G10; G10L; G10L19/00; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/56; H04B7/00; H04B7/24; H04B7/26; H04B7/2662; H04B7/2671; H04B7/2678; H04J; H04J3/00; H04J3/16; H04J3/1682; H04J3/1688; G10L19/04; G10L19/16; G10L19/18; G10L19/24; H04W56/00; H04W56/001; H04W56/0055; H04W56/0065; H04W56/007; H04W56/0075; H04W56/0085
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A method for controlling a primary station (102) to operate in a time division multiplex communication system having a plurality of remote units (104, 106, 108), comprising the steps of: (a) receiving an activation code from at least one of the plurality of remote units; (b) transmitting a data signal (300) containing at least a synchronization portion (306, 308) and slot assignment information (310) to at least one remote station; (c) receiving (910) an information signal (314) from a remote unit, including a preambled data signal, during at least one time slot from a communication channel at a predetermined data rate C to provide a received information signal; (d) repeating (912) said received information signal preambled by a data signal in at least one time slot at said rate; (e) operating, thereafter, continuously until it is determined that none of the plurality of remote units has transmitted information for a time interval, and deactivating the primary station automatically after that time interval.
Claim 2
Independent Claim
162 words
A method for controlling a primary station (102) to operate in a time division multiplex communication system having a plurality of remote units (104, 106, 108), comprising the steps of: (a) receiving an activation code from at least one of the plurality of remote units; (b) transmitting a data signal (300) containing at least a synchronization portion (306, 308) and slot assignment information (310) to at least one remote station; (c) receiving (910) an information signal (314) from a remote unit, including a preambled data signal, during at least one time slot from a communication channel at a predetermined data rate C to provide a received information signal; (d) repeating (912) said received information signal preambled by a data signal in at least one time slot at said rate; (e) operating, thereafter, continuously until it is determined that none of the plurality of remote units has transmitted information for a time interval, and deactivating the primary station automatically after that time interval.
Claim 3
Dependent Claim
29 words
The method of claim 1, which includes the step of retransmitting said data signal of step (b) upon the failure of receiving the preambled data signal of step (c).
Claim 4
Dependent Claim
25 words
The method of claim 1, which includes the step of buffering said received information signal of step (c) prior to repeating same in step (d).
Claim 5
Independent Claim
211 words
A method for communicating information between a first time division multiplex communication device (104, 106, 108) and a plurality of remote (104, 106, 108) time division multiplex communication devices via a time division multiplex repeater (102), comprising the steps of: (a) at a first communication device: (1) transmitting an activation code to the repeater (102) if the repeater is determined to be inactive; (2) transmitting an information signal (314) to the repeater in a first time slot over a communication channel at a predetermined data rate C in accordance with a time division multiplex protocol; (b) at the repeater: (1) receiving said activation code; (2) transmitting a synchronization signal (306, 308) to the plurality of remote communication devices; (3) receiving said information signal (314) from said communication channel during said first time slot; (4) repeating (912) said information signal in a second time slot preambled by a data signal; (5) operating, thereafter, continuously until it is determined that none of the plurality of remote units has transmitted information for a time interval, and deactivating the repeater automatically after that time interval; (c) at the remaining plurality of remote communication devices or a portion thereof: (1) synchronising to said synchronization signal; (2) receiving said repeated information signal in an assigned time slot.
Claim 6
Independent Claim
211 words
A method for communicating information between a first time division multiplex communication device (104, 106, 108) and a plurality of remote (104, 106, 108) time division multiplex communication devices via a time division multiplex repeater (102), comprising the steps of: (a) at a first communication device: (1) transmitting an activation code to the repeater (102) if the repeater is determined to be inactive; (2) transmitting an information signal (314) to the repeater in a first time slot over a communication channel at a predetermined data rate C in accordance with a time division multiplex protocol; (b) at the repeater: (1) receiving said activation code; (2) transmitting a synchronization signal (306, 308) to the plurality of remote communication devices; (3) receiving said information signal (314) from said communication channel during said first time slot; (4) repeating (912) said information signal in a second time slot preambled by a data signal; (5) operating, thereafter, continuously until it is determined that none of the plurality of remote units has transmitted information for a time interval, and deactivating the repeater automatically after that time interval; (c) at the remaining plurality of remote communication devices or a portion thereof: (1) synchronising to said synchronization signal; (2) receiving said repeated information signal in an assigned time slot.
Claim 7
Dependent Claim
34 words
The method of claim 4, wherein the step of synchronizing comprises the steps of: (a) adjusting a bit synchronization means in response to a bit sync signal; (b) detecting a predetermined frame synchronization word.
Claim 8
Dependent Claim
24 words
The method of claim 5, wherein said detecting step comprises detecting said predetermined frame synchronization word based on a three of five majority decision.
Claim 9
Independent Claim
56 words
A method according to any one of the preceding claims wherein the communication channel is divided into time sub-slots which are grouped into subsets (1A, 1B, 1C) that form communication time slots for use by the remote communications devices and wherein different remote communications devices are allocated time slots comprising different predetermined numbers of time sub-slots.
Claim 10
Dependent Claim
30 words
A method according to claim 7 wherein each time sub-slot has associated with it a data portion (202) for signalling protocol information and a voice portion for vo-coded voice information.
Claim 11
Dependent Claim
160 words
A repeater (102) for operation in a timed multiplex communication system having a plurality of remote units (104, 106, 108), comprising: a) means for receiving an activation code from at least one of the plurality of remote units; b) means for transmitting a data signal (300) containing at least a synchronization portion (306, 308) and slot assignment information (310) to at least one remote station; c) means for receiving (910) an information signal (314) from a remote unit, including a preambled data signal, during at least one time slot from a communication channel at a predetermined data rate c to provide a received information signal; d) means for repeating (912) said received information signal preambled by a data signal in at least one time slot at said rate; e) means for determining that none of the plurality of remote units has transmitted information for a time interval, and f) means for de-activating the primary station automatically after that time interval.
Claim 12
Dependent Claim
160 words
A repeater (102) for operation in a timed multiplex communication system having a plurality of remote units (104, 106, 108), comprising: a) means for receiving an activation code from at least one of the plurality of remote units; b) means for transmitting a data signal (300) containing at least a synchronization portion (306, 308) and slot assignment information (310) to at least one remote station; c) means for receiving (910) an information signal (314) from a remote unit, including a preambled data signal, during at least one time slot from a communication channel at a predetermined data rate c to provide a received information signal; d) means for repeating (912) said received information signal preambled by a data signal in at least one time slot at said rate; e) means for determining that none of the plurality of remote units has transmitted information for a time interval, and f) means for de-activating the primary station automatically after that time interval.
References Cited (Backward Citations)
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