Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels

• US 6,282,180 B1
• Filed: 11/04/1999
• Issued: 08/28/2001
• Est. Priority Date: 03/20/1985
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Paneth, Eric, Handzel, Mark J., Morley, Steven Allan, Avis, Graham M.
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): VANDERPUYE, KENNETH N
• Application Number:
  US09/433,430
• Time in Patent Office: 663 Days
• Field of Search: 370/330, 370/436, 370/478, 370/341, 370/327, 370/340, 455/403, 455/33.1, 455/54.1, 379/59
• US Class Current: 370/330
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0865 Independent weighting, i.e. weights based on own antenna reception parameters
• CPC Class Codes: H04J 3/0647 Synchronisation among TDM nodes
• CPC Class Codes: H04J 3/0682 by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0084 Formats for payload data
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1642 Formats specially adapted for sequence numbers
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/14 : using intermediate storage
• CPC Class Codes: H04W 28/24 : Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 28/26 : Resource reservation
• CPC Class Codes: H04W 36/12 : Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 4/18 : Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 40/02 : Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 52/0216 : using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/20 : using error rate
• CPC Class Codes: H04W 56/00 : Synchronisation arrangements
• CPC Class Codes: H04W 72/02 : Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/044 : based on the type of the allocated resource
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/04 : Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 76/10 : Connection setup
• CPC Class Codes: H04W 84/00 : Network topologies
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

A telecommunication system for processing a plurality of simultaneous bidirectional communications includes a primary station and at least one secondary station using wireless transmissions over one of a plurality of available RF carrier frequencies. Each carrier frequency has an associated predetermined bandwidth which is designed to accommodate one analog voice signal therein and each carrier frequency contains a plurality of time slots. Each bidirectional communication includes transmit (TX) and receive (RX) information signals. The secondary stations include a baseband processor for PSK coding an input signal; a storage means coupled to said baseband processor for storing information; a control means coupled to the baseband processor and the storage means to permit access to the stored information; a filter for performing quadrature sampling of the PSK coded signal; a digital to analog converter for converting the sampled PSK coded signal into an analog signal; and a frequency translator for translating the frequency spectrum of the analog signal to a second frequency spectrum.

Claims

1. A digital telephone system for processing in a base station a plurality of information signals received in parallel over telephone trunk lines from a public network which are then transmitted from the base station over a plurality of radio frequency (RF) channels to a plurality of mobile subscriber units, wherein the base station comprises:

an exchange for receiving information signals from said trunk lines and providing them as digital signal samples;

a plurality of signal compressors associated with each one of said RF channels for compressing the digital signal samples received from the exchange and for providing a number of separate compressed signals;

a channel circuit corresponding to each one of said RF channels for sequentially combining the compressed signals into a single transmit channel bit stream, with each of the compressed signals occupying a sequential slot position in the transmit channel bit stream;

a transmitter for outputting a transmit channel signal for transmission over one of the radio frequency channels in response to the transmit channel bit stream;

said exchange having a switch which connects the received information signals to respective compressors;

a remote-connection central processing unit connectable to said trunk lines and responsive to a connection request signal received over one of said trunk lines by providing a slot assignment signal indicating which one of the compressors is to be associated with the respective information signal received and the one slot in the transmit channel bit stream to be used, wherein the remote-connection central processing unit maintains a memory of which slots and which radio frequencies are so assigned and consults said memory upon receipt of a connection request signal and then provides the slot assignment signal that establishes the connection to a compressor and also selects one of the slots that is not assigned to another trunk line;

the remote-connection central processing unit using said slot assignment signal for causing the switch to establish the connection indicated by said slot assignment signal, and wherein the remote-connection central processing unit communicates through said channel circuits and said transmitter a signal representative of the assigned time slot and frequency corresponding to said slot assignment signal to the subscriber unit to which a communications request is addressed to permit the subscriber unit to configure itself to the assigned time slot and frequency.

2. A digital telephone system as in claim 1, wherein said slot assignment signal indicates which slot position in the transmit channel bit stream is used by the channel circuit for association with the compressor connected to the trunk line.

3. A digital telephone system as in claim 1, wherein the slots at the transmit channel bit stream are combinable into system frames, and wherein the frames may have equal slot lengths or unequal slot lengths.

4. A digital telephone system as in claim 2, wherein the base station can be reconfigured to accommodate different radio frequency channels.

5. A digital telephone system for processing in a base station a plurality of information signals received in parallel over telephone trunk lines from a public network which are then transmitted from the base station over radio frequency (RF) channels to a plurality of mobile subscriber units,

the base station comprising:

an exchange for handling the information signals received over the trunk lines as digital signal samples,

a plurality of transmit channel circuits, each of which is assigned to a different one of the RF channels and each of which has a plurality of signal compressors for compressing the digital signal samples respectively received from the exchange to provide a number of separate compressed signals, a channel control circuit connected to the compressors for sequentially combining the compressed signals into a single transmit channel bit stream with each of the compressed signals occupying a sequential slot position in the transmit channel bit stream, and a modulator for generating in response to the transmit channel bit stream a modulated subcarrier signal,

a transmitter for outputting a modulated main carrier signal for transmission over the assigned RF channel, in response to the modulated subcarrier signal,

the exchange having a switch which connects the received information signals to the respective compressor;

a remote-connection central processing unit connectable to the trunk lines and responsive to a connection request signal received over one of the trunk lines by providing a slot assignment signal indicating which transmit channel circuit, and which one of the compressors in the transmit channel circuit indicated by the slot assignment signal, the information signal received should be associated with, and also to assign both the frequency and the slot position to the information signal, wherein the remote-connection central processing unit maintains a memory of which slots are so assigned for each of the plurality of frequencies and consults the memory upon receipt of an incoming connection request signal and then provides the slot assignment signal that establishes the connection to a given transmit channel circuit in which not all of the time slots are assigned and also assigns a compressor therein that is not assigned to another trunk line,

the remote-connection central processing unit using said slot assignment signal for causing the switch to complete the connection indicated by the slot assignment signal, and wherein the remote connection central processing unit communicates through said channel control circuit and said transmitter a signal representative of the assigned time slot and frequency corresponding to said slot assignment signal to the subscriber unit to which a communication request is addressed to permit the subscriber unit to configure itself to the assigned time slot and frequency.

6. A digital telephone system as in claim 5, wherein said slot assignment signal indicates which slot position in the transmit channel bit stream is used by the channel control circuit for association with the compressor connected to the trunk line.

7. A digital telephone system as in claim 5, wherein the slots at the transmit channel bit stream are combinable into system frames, and wherein the frames may have equal slot lengths or unequal slot lengths.

8. A digital telephone system as in claim 5, wherein the base station can be reconfigured to accommodate different radio frequency channels.