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

• US 5,121,391 A
• Filed: 11/20/1989
• Issued: 06/09/1992
• Est. Priority Date: 03/20/1985
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Morley, Steven A., Handzel, Mark J., Paneth, Eric, Avis, Graham M.
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): TON, DANG T
• Application Number:
  US07/439,100
• Time in Patent Office: 932 Days
• Field of Search: 370/95.1, 370/95.3, 370/50, 370/109, 455/33, 455/54, 455/56, 379/59, 379/58, 379/63, 379/60
• US Class Current: 370/341
• 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 system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division circuits is determined by the transmission quality of the signals. The base station is interconnected with an external information network, which may be analong and/or digital. The information signals are selected from the group consisting of voice, data, facsimile, video, computer and instrumentation signals. The modulation level of the the signals and the power applied to the system are adjusted in accordance with the signal error detection in the system. The system is provided with spatial diversity by using a plurality of antennas selectively spaced from each other to provide relatively high signal reception despite signal fading. The base station operates over a plurality of RF channel pairs. Each channel pair operation is implemented by the combination of a transmit channel circuit for processing a given plural number of information signals received simultaneously over telephone company trunk lines for simultaneous transmission to different subscriber stations over a given RF channel, and a receive channel circuit for processing a plurality of signals received simultaneously over a given RF channel from different subscriber stations to provide information signals for transmission over the trunk lines.

Claims

1. A system for processing a given plural number of information signals received simultaneously over telephone company trunk lines for simultaneous transmission over a given radio frequency (RF) channel, comprising

separate conversion means for respective connection to said trunk lines for converting the information signals received over said trunk lines into digital signal samples;

a given plural number of separate signal compression means for simultaneously compressing the digital signal samples respectively derived from separate ones of the conversion means to provide said given number of separate compressed signals;

channel control means connected to the compression means for sequentially combining the compressed signals into a single transmit channel bit stream, with each of the respective compressed signals occupying a repetitive sequential slot position in the transmit channel bit stream associated with a predetermined one of the separate compression means;

an exchange for coupling the respective separate conversion means to indicated ones of the separate compression means;

remote-connection processor means and at least one remote connection, said remote-connection processor means acting to couple said remote connection to a respective trunk line and being responsible to an incoming call request signal received over said trunk line by providing a slot assignment signal indicating which one of separate compression means the exchange is to connect to the one of the separate conversion means connected to said trunk line and thereby assigning to said trunk line the slot in the transmit channel bit stream associated with the one of the separate compression means that is so connected by the exchange means, wherein the remote-connection processor means maintains a memory of which slots are so assigned and consults said memory upon receipt of a said incoming call request and then provides a said slot assignment signal that effects a said connection to a compression means associated with one of the slots that is not assigned to another trunk line;

call processor means connected to the remote-connection processor means and responsive to a said slot assignment signal for causing the exchange to complete the connection indicated by said slot assignment signal; and

echo cancellation means providing for cancellation of undesired echo signals received from said remote connection.

2. The system of claim 1 wherein said remote connection comprises a subscriber station having means to receive said transmit channel signal and to provide a responsive signal, said subscriber station also having echo cancellation means to cancel undesirable echo signals resulting form said responsive signal.