US 5,566,168 AGranted

TDMA/FDMA/CDMA hybrid radio access methods

AssigneeEricsson GE Mobile Communications Inc.

InventorPaul W. Dent

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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.

Claims7

Dependent claims

A communication system for providing telephone communications between a number of outstations in a subscriber and a public switched telephone network comprising at least one orbiting satellite and at least one hubstation in communication with said satellite and said public switched telephone network comprising:

at least one orbiting satellite in communication with at least one of said outstations and said hubstation, said satellite including:
multiple beam antenna means for illuminating different areas on the earth with signals to be transmitted from said satellite to said outstations;
multiple transmitter means for generating said transmit signals associated with respective beams of said multiple beam antenna means;
and
multiple receiver means for receiving signals from said hubstation to be retransmitted by said multiple transmitter means and respective beams of said multiple beam antenna;
at least one hubstation in communication with at least one orbiting satellite, comprising:
multiple multiplexed means for multiplexing signals intended for retransmission from said satellite using a particular beam of said multiple beam antenna into respective active time slots of a corresponding time division multiplex frame also including inactive time slots to produce corresponding TDM signals;
multiple transmitter means in radio communication respectively with said multiple satellite receiver means for transmitting said corresponding TDM signals such that each TDM signal is retransmitted from a corresponding one of said multiple satellite antenna beams;
and
time slot allocating means to allocate said active time slots in each beam so that they coincide with inactive time slots in neighboring beams.

7 more elements

A communication satellite system for providing telephone communications 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 the public switched telephone network, comprising:

at least one orbiting satellite in communication with at least one of said outstations and said control station, said satellite comprising:
multiple beam antenna means for receiving uplink signals from groups of said outstations located in respective regions of the earth and transmitting corresponding downlink signals to said outstations;
first multiple receiver means each associated with one of said multiple antenna beams for receiving said uplink signals;
first multiple transmitter means coupled to said first multiple receiver means for relaying said received signals to said control station;
second multiple receiver means for receiving time division multiplex signals from said control station;
and
second multiple transmitter means each associated with one of said multiple antenna beams and coupled to said second multiple receiver means for relaying said TDM signal to said outstation;
at least one control station in communication with said at least one orbiting satellite, comprising:
multiple receiver means for receiving said relayed uplink signals from said satellite;
multiple transmitter means for transmitting time division multiplex signals to said satellite for retransmission by said satellite to said outstations in corresponding downlink satellite antenna beams;
and
time slot and frequency allocating means to associate uplink channel frequencies used by said outstations for transmitting with downlink time slots used by said outstations for receiving such that allocated downlink time slots and associated uplink frequencies in one of said multiple antenna beams correspond to unallocated time slots and frequencies in neighboring beams.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/475,303Filed 7 Jun 1995 · division
Priority: 11 Jan 1994
Granted: 15 Oct 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H04B 7/18539
Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service: arrangements for managing radio, resources,…
H04B 7/18532
Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service: arrangements for managing transmission, i.e.…
H04B
Transmission