EP0583233A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Radio telephony system using a multisubscriber unit
Assignee: The AT&T MVPD Group LLC
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Filing: 1993-08-13
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Granted: —
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Expires: 2013-08-13
Abstract
Abstract A digital cellular communication system (18) where fixed subscribers and mobile subscribers can share base transceiver stations (28), base station controllers (29) and mobile switching centers (30) to communicate with a PSTN (32). Mobile (20) and fixed (26) subscribers can communicate via any common cellular radio protocol, but the fixed subscribers communicate through conventional telephones using a multisubscriber unit (22). The system (18) preferably uses a digital speech interpolation pool in a time division multiple access system having different carrier frequencies each of which are time divided into six time slots. The multisubscriber unit communicates with the base transceiver station over a radio link managing most of the tasks required for the air interface so that inexpensive conventional telephones can be used for the fixed subscribers.
Inventors
- 👤 Pradeep Kaul
- 👤 Stanley E. Kay
- 👤 Michael I. Parr
- 👤 Graham Avis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:56
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2643; H04W; H04W84/00; H04W84/02; H04W84/10; H04W84/14; G; G10; G10L; G10L19/00; G10L19/012; G10L25/00; G10L25/78; H04J; H04J3/00; H04J3/17; H04J3/172; H04W88/00; H04W88/08
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
186 words
In a system for telephony communication of subscriber telephones (26) through a radio link with a remotely located base station (25,28,29,30), the base station having a transceiver (28) and a link to a telephone network (32), for example a public switched telephone network, a multisubscriber unit (22) for radio telephony communication between the subscriber telephones and the base station transceiver comprising: a plurality of connectors (23) for providing electrical communication with the plurality of subscriber telephones; a subscriber interface (23) coupled to the connectors for detecting an off-hook condition at each of the telephones; a subscriber activity detector (56) for detecting, through the connectors, the presence of data to be transmitted at each telephone at which an off-hook condition is detected; a processor (58) for modulating data from the telephones for transmission over the radio link; a transceiver (42) for transmitting the modulated data from each telephone at which data is detected to the base station and for receiving data from the base station for transmission to the telephones; a processor (60) for demodulating data from the transceiver for transmission through the connectors to the telephones.
Claim 2
Independent Claim
166 words
A system for telephony communication of subscriber telephones (26) through a radio link with a remotely located base station (25, 28, 29, 30) comprising: a base station having a link to a telephone network (32) and a transceiver (28) for receiving signals from and transmitting signals to a plurality of subscriber telephones (26); at least one mobile subscriber telephone (20) having an antenna for receiving signals from and transmitting signals to the base station transceiver; a plurality of fixed subscriber telephones (26); a multisubscriber unit (22) coupled to the plurality of fixed subscriber telephones, having a subscriber interface (23) for detecting an off-hook condition at each of the telephones, a subscriber activity detector (56) for detecting the presence of data to be transmitted at each telephone at which an off-hook condition is detected, and a transceiver (42) for transmitting the data from each telephone at which data is detected to the base station and for receiving data from the base station for transmission to the telephones.
Claim 3
Dependent Claim
58 words
The invention of claim 2 wherein the multisubscriber unit further comprises: a plurality of connectors (23) for providing electrical communication with the plurality of subscriber telephones; a processor (58) for modulating data from the telephones for transmission over the radio link; a processor (60) for demodulating data from the transceiver for transmission through the connectors to the telephones.
Claim 4
Dependent Claim
68 words
The invention of any one or more of the above claims wherein the data to be transmitted comprises speech, the subscriber activity detector (56) comprises a speech spurt detector, the processor (58) for modulating data comprises a speech spurt encoder for converting spurts of speech into a compressed digital form, and the processor (60) for demodulating comprises a decoder for converting compressed digital bit sequences into speech spurts.
Claim 5
Dependent Claim
47 words
The invention of any one or more of the above claims further comprising means (40) coupled to the subscriber activity detector (56) for requesting the allocation of a traffic transmission channel from the base station upon the detection of the presence of data at a telephone (26).
Claim 6
Dependent Claim
47 words
The invention of any one or more of the above claims further comprising means coupled to the subscriber activity detector (56) for requesting the deallocation of a traffic transmission channel from the base station upon the detection of the end of data presence at a telephone (26).
Claim 7
Dependent Claim
97 words
The invention of claim 1, 3 4, 5, or 6 wherein the processor for modulating comprises a plurality of modulators (58) each independently assignable to one of the plurality of telephones (26) and the processor for demodulating comprises a plurality of demodulators (60) each independently assignable to one of the plurality of telephones (26), the unit further comprising a controller (40) for assigning the modulators and demodulators among those telephones for which the presence of data is detected and for deallocating the modulators and demodulators from those telephones for which the end of data presence is detected.
Claim 8
Dependent Claim
46 words
The invention of any one or more of the above claims wherein the transceiver (28) comprises means for transmitting and receiving frames of digital information in a time division multiple access format each frame including a plurality of time slots for channel allocation and deallocation information.
Claim 9
Dependent Claim
44 words
The invention of any one or more of the above claims wherein the subscriber interface (23) comprises means for generating a dial tone in response to the detection of an off-hook condition for communication to the telephone for which the off-hook condition was detected.
Claim 10
Dependent Claim
49 words
The invention of any one or more of the above claims wherein the subscriber interface (23) comprises means for generating a ringing signal in response to an indication of an incoming call from the base station for communication to the telephone (26) for which the incoming call is intended.
Claim 11
Dependent Claim
64 words
The invention of any one or more of the above claims further comprising: a bus (50) interconnecting the subscriber interfaces (23) and the processors (58, 60); and a multilink pad (98) connected to the bus having an input port for a high speed data subscriber for allowing data to be transmitted between the base station and the high speed data subscriber through the transceiver.
Claim 12
Independent Claim
161 words
A method of communicating a plurality of subscriber telephones (26) through a radio link with a base station (25, 28, 29, 30) remotely located from the telephones via a multisubscriber unit (22) connected to each of the plurality of subscriber telephones, the method comprising the steps of: detecting an off-hook condition at one of the subscriber telephones; selecting one of a plurality of modulators (58) in response to the detected off-hook condition and assigning the selected modulator to the one subscriber telephone; transmitting a signal to the base station requesting a reverse channel allocation; transmitting a reverse channel assignment to the multisubscriber unit from the base station assigning a channel from among a plurality of channels; transmitting from the multisubscriber unit to the base station, a call origination message identifying the one subscriber telephone and a party to be called; and transmitting a request to deallocate the channel assignment in response to completion of the transmission of the call origination message.
Claim 13
Dependent Claim
43 words
The method of Claim 12 further comprising, after the step of detecting an off-hook condition, the step of selecting one of a plurality of demodulators (60) in response to the detected off-hook condition and assigning the selected demodulator to the one subscriber telephone.
Claim 14
Dependent Claim
43 words
The method of Claim 12 or 13 further comprising, after the step of selecting a modulator (58), the step of generating a dial tone at the multisubscriber unit (22) and transmitting it to the telephone (26) at which the off-hook condition was detected.
Claim 15
Dependent Claim
50 words
The method of Claim 12, 13 or 14 further comprising, before the step of transmitting a call origination message, the step of receiving from the one subscriber telephone (26) a dialing sequence indicating a party to be called and using the received dialing sequence to generate the call origination message.
Claim 16
Independent Claim
158 words
A method of communicating a plurality of subscriber telephones through a radio link with a base station (25, 28, 29, 30) via a multisubscriber unit (22) connected to each of the plurality of subscriber telephones, the method comprising the steps of: receiving at the multisubscriber unit a channel assignment and notification of an incoming call; transmitting from the multisubscriber unit to the base station a page response for completing a call origination; receiving at the multisubscriber unit from the base station a call assignment message establishing the incoming call as one that terminates at a subscriber telephone which is coupled to the multisubscriber unit; transmitting from the multisubscriber unit an acknowledgment of the call assignment message; transmitting, from the multisubscriber unit to the subscriber telephone at which the incoming call is to terminate, a ringing signal; and transmitting from the multisubscriber unit to the base station a connect message in response to an off-hook detection of the telephone.
Claim 17
Dependent Claim
54 words
The method of Claim 16, further comprising, after the step of transmitting a page response, the steps of: transmitting from the multisubscriber unit to the base station a deallocation request for releasing the channel assigned by the channel assignment; and receiving at the multisubscriber unit from the base station acknowledgment of the deallocation request.
Claim 18
Dependent Claim
97 words
The method of Claim 16 or 17 wherein the step of receiving a channel assignment and notification of an incoming call comprises the steps of: receiving at the multisubscriber unit a message identifying a channel for receipt of a page message; receiving at the multisubscriber unit a page message including an incoming call notification in the identified channel; transmitting from the multisubscriber unit a request to the base station to assign a channel for a response to the page message; and receiving from the base station a reverse assignment message assigning a channel for the page response.
Claim 19
Independent Claim
172 words
A method of communicating a plurality of subscriber telephones (26) coupled to a multisubscriber unit (22) through a radio link with a base station transceiver (28) the method comprising the steps of: establishing, at the base station transceiver (28) a pool of available traffic transmission channels, each traffic transmission channel having a time slot in a repeating time division multiple access frame at a predetermined carrier frequency; responding at the multisubscriber unit (22) to detection of an information spurt at a telephone (26), by transmitting a request for assignment of a traffic transmission channel; selecting at the base station an available traffic transmission channel from the pool of available traffic transmission channels in response to receipt of the channel assignment request; transmitting in a first slot an identification of the selected channel to the multisubscriber unit and removing the selected channel from the pool of available traffic channels; and transmitting the information spurt from the multisubscriber unit in the selected channel in response to receipt of the identification of the selected channel.
Claim 20
Dependent Claim
46 words
The method of Claim 19 further comprising the steps of: detecting termination of the information spurt at the base station; transmitting a channel deallocation notice to the multisubscriber unit for deallocating the selected channel; releasing the selected channel to the pool of available traffic transmission channels.
Claim 21
Dependent Claim
44 words
The method of Claim 20 further comprising the step of transmitting an acknowledgment of the channel deallocation notice from the multisubscriber unit to the base station and wherein the channel deallocation notice includes an identification of an appropriate channel for transmission of the acknowledgment.
Claim 22
Dependent Claim
18 words
The method of Claim 20 or 21 wherein the channel deallocation notice is transmitted in the selected channel.
Claim 23
Independent Claim
26 words
The method of any one or more of Claims 12 to 18 further comprising the steps of any one or more of Claims 19 to 22.
Claim 24
Independent Claim
154 words
A method of communicating a plurality of subscriber telephones coupled to a multisubscriber unit through a radio link with a base station transceiver the method comprising the steps of: establishing, at the base station transceiver a pool of available traffic transmission channels, each traffic transmission channel having a time slot in a repeating time division multiple access frame at a predetermined carrier frequency; detecting a speech spurt at the base station transceiver which is intended for transmission to one of the telephones from among the plurality of subscriber telephones; selecting at the base station an available traffic transmission channel from the pool of available traffic transmission channels in response to the speech spurt detection; transmitting in a first slot an identification of the selected channel to the subscriber unit and removing the selected channel from the pool of available traffic channels; and transmitting the speech spurt in the selected channel to the multisubscriber unit.
Claim 25
Dependent Claim
49 words
The method of Claim 24 further comprising the steps of: detecting, at the base station termination of the speech spurt intended for the telephone; transmitting to the multisubscriber unit notice of deallocation of the selected channel and releasing the selected channel to the pool of available traffic transmission channels.
Claim 26
Independent Claim
42 words
The method of any one or more of Claims 19 to 25 wherein the information spurt comprises a speech spurt and wherein the step of transmitting the speech spurt comprises compressing and encoding the detected speech spurt into a digital bit sequence.
Claim 27
Independent Claim
51 words
The method of any one or more of Claims 19 to 26 wherein the first time slot comprises a plurality of time division subslots, wherein the channel assignment is transmitted in a subslot of the first slot and wherein the first slot is of a different channel than the selected channel.
Claim 28
Independent Claim
34 words
The method of any one or more of Claims 19 to 27 wherein the step of transmitting an identification of the located channel comprises transmitting the identification with time, frequency or power level diversity.
Claim 29
Dependent Claim
28 words
The method of Claim 27 or 28 wherein the first slot is a slot of a control channel having a plurality of slots assigned to different carrier frequencies.
Claim 30
Independent Claim
26 words
The method of any one or more of Claims 12 to 18 further comprising the steps of any one or more of Claims 24 to 29.
References Cited (Backward Citations)
No citation records indexed.
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