TDMA/FDMA/CDMA hybrid radio access methods
First Claim
1. A radio access method for facilitating communication between at least one first station and a plurality of second stations, comprising the steps of:
- buffering at said first station each signal intended for transmission respectively to each of said second stations;
dividing said signals into equal length segments;
transmitting signal segments intended for a particular one of said second stations using a corresponding time slot in a regularly repeating time multiplex frame;
receiving at at least one of said second stations said signal segments transmitted by said first station in its corresponding time slot and assembling said signal segments from successive corresponding time slots to reconstruct said intended signal;
determining at said second station a transmit frequency channel uniquely associated with said corresponding receive time slot; and
buffering in said second station a signal intended for transmission to said first station and compressing it for transmission from said second station using said transmit frequency channel during substantially the entire time period that said second station is not receiving.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio access method for facilitating communication between at least one first station and a plurality of second stations is disclosed. First, each signal intended for transmission is buffered at a first station. The signals are then divided into equal length segments. The signal segments intended for a particular one of the second stations is transmitted using a corresponding time slot in a regularly repeating time multiplex frame. The signal segments transmitted by the first station are received at at least one of the second stations and the signal segments are assembled from successive corresponding time slots to reconstruct said intended signal. A transmit frequency channel uniquely associated with the corresponding receive time slot is determined at the second station. Finally, a signal intended for transmission to the first station is buffered in the second station and compressed for transmission using the transmit frequency channel during substantially the entire time period that the second station is not receiving.
-
Citations
49 Claims
-
1. A radio access method for facilitating communication between at least one first station and a plurality of second stations, comprising the steps of:
-
buffering at said first station each signal intended for transmission respectively to each of said second stations; dividing said signals into equal length segments; transmitting signal segments intended for a particular one of said second stations using a corresponding time slot in a regularly repeating time multiplex frame; receiving at at least one of said second stations said signal segments transmitted by said first station in its corresponding time slot and assembling said signal segments from successive corresponding time slots to reconstruct said intended signal; determining at said second station a transmit frequency channel uniquely associated with said corresponding receive time slot; and buffering in said second station a signal intended for transmission to said first station and compressing it for transmission from said second station using said transmit frequency channel during substantially the entire time period that said second station is not receiving.
-
-
2. A radio access method for facilitating communication between a fixed station and a given number of mobile stations, comprising the steps of:
-
buffering at said fixed station signals to be transmitted to said mobile stations; dividing said signals into segments; transmitting the segments intended for a particular mobile station on time slots which are allocated for receiving at the particular mobile station, wherein said time slots regularly recur in a repetitive time multiplex frame which contains a number of time slots equal to said given number; determining at each mobile station a transmit frequency channel uniquely corresponding to the mobile station'"'"'s allocated time slot; and buffering in at least one of said mobile stations a signal to be transmitted to said fixed station and transmitting the signal on said transmit frequency channel during more than one time slot in which said mobile station is not receiving.
-
-
3. A radio access method for facilitating communication between a first station and a predetermined number of second stations, comprising the steps of:
buffering in said first station signals to be transmitted to said second stations, said first and second stations having means for transmitting and receiving signals; dividing said signals into segments; transmitting the segments intended for a particular one of said second stations using only time slots that are allocated to said particular second station for receiving, wherein said time slots regularly recur in a repetitive time multiplex frame containing a number of time slots equal to said predetermined number; and buffering in at least one of said second stations a signal to be transmitted to said first station and transmitting said signal during more than one time slot in which said second station is not receiving. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
-
12. A radio transmitter/receiver for communicating in both directions with a radio network, comprising:
-
a timing control unit for sequencing transmit and receive functions; an antenna switch for connecting an antenna alternately to the transmitter/receiver under the control of said timing control unit; a receiver portion controlled by said timing control unit to receive a signal from said radio network during an allocated time slot in a time division multiplex frame period; and a transmitter portion capable of being controlled by said timing control unit to transmit in a timeslot of a transmit time division multiplex frame having a different number of timeslots than in said receive time division multiplex frame period and selected such that said transmit timeslot coincides with a portion of said receive time division multiplex frame period in which said receiver is not receiving. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A radio transmitter/receiver for communicating in both directions with a radio network, comprising:
-
a timing control unit for sequencing transmit and receive functions repetitively within a given frame period; a receiver unit activated by said timing control unit to receive a signal from said radio network during a first allocated time slot with a length equal to a first portion of said frame period; and a transmitter unit capable of being activated by said timing control unit to transmit during a second allocated time slot with a length equal to a second portion of said frame period which does not overlap said first portion and in which said second time slot is substantially longer than said first time slot. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
-
-
34. A radio base station for communication with a plurality of outstations, comprising:
-
multiplexing means for multiplexing digitized, compressed and error correction coded speech signals intended for said outstations into corresponding time slots in a TDM frame; modulating means to impress said multiplex digital signals on a transmitter carrier frequency signal; transmitter means coupled to antenna means to transmit said modulated carrier signals; and a plurality of receiver means coupled to the antenna means for receiving signals from said outstations on a corresponding plurality of signal frequencies within a shared channel bandwidth, each receiver means receiving a signal from a particular outstation only when said transmitter means is not transmitting the time slot intended for reception at said particular outstation. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
-
-
46. A method of communication for providing telephone communications between at least one outstation in a subscriber in a public switched telephone network comprising at least one orbiting satellite and at least one ground control station in communication with said satellite and said public switched telephone network, comprising the steps of:
-
transmitting from said satellite a signal bearing time division multiplex information comprised of at least one time slot in a repetitive TDMA frame period, each time slot being allocated for reception by one of said outstations; receiving signal bursts from said satellite at said one outstation during its allocated time slot in said TDMA frame; determining a transmit frequency channel uniquely associated with said allocated time slot; and transmitting signal bursts using said transmit frequency channel from said one outstation to said satellite using substantially all of the remaining unused parts of the TDMA frame during which said outstation is not receiving.
-
-
47. A method for providing telephone communications between a number of outstations and a subscriber in a public switched telephone network comprised of at least one orbiting satellite and at least one ground control station in communication with said satellite and the public switched telephone network, comprising the steps of:
-
allocating to each of said outstations a time slot in a repeating time division multiplex frame, for reception from said satellite and an associated frequency channel for transmission to said satellite; receiving signal bursts from said satellite at one of said outstations during its allocated time slot in said TDM frame; and transmitting signal bursts using said allocated transmit frequency channel from said one of said outstations to said satellite during one or more of said time slots not allocated for reception at the same outstation.
-
-
48. A method for providing telephone communications between a first number of outstations and a subscriber in a public switch telephone network comprising at least one orbiting satellite and at least one ground control station in communication with said satellite and said public switch telephone network comprising the steps of:
-
allocating to each of said outstations a time slot in a repeating down-link time division multiplex frame period for reception from said satellite; receiving signal bursts from said satellite at one of said outstations during said allocated time slot and said downlink TDM frame; determining a second number of transmit frequency channels and a third number of transmit time slots in a repetitive uplink TDM frame to be used by said outstations for transmitting to said satellite, the product of said second and third numbers being equal to said first number; allocating to each of said outstations a unique combination of one of said transmit frequency channels and transmit time slots depending on their respective allocated receive time slots such that the transmit time slot and receive time slot at any particular outstation do not overlap; and transmitting signal bursts using said allocated transmit frequency channel in said allocated transmit time slot from at least one of said outstations to said satellite.
-
-
49. A method for providing telephone communication between a number of outstations and a subscriber in a public switched telephone network comprising at least one orbiting satellite and at least one ground control station in communication with said satellite and said public switched telephone network, comprising the steps of:
-
allocating to each of said outstations a time slot in a repeating down-link time division multiplex frame period for reception from said satellite; receiving signal bursts from said satellite at one of said outstations during its allocated time slot and said downlink TDM frame; determining a second number of transmit frequency channels and a third number of transmit codes from a set of code division multiple access codes to be used by said outstations for transmitting to said satellite, the product of said second and third numbers being equal to said first number; allocating to each of said outstations a unique combination of one of said transmit frequency channels and one of said CDMA codes in dependence on their respective allocated receive time slots; and transmitting signal bursts using said allocated transmit frequency channel and CDMA code from at least one of said outstations to said satellite using unused parts of said TDM frame period during which time said outstation is not receiving from said satellite.
-
Specification