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

• US 6,771,667 B2
• Filed: 02/26/2003
• Issued: 08/03/2004
• 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: Handzel, Mark J., Morley, Steven Allan, Avis, Graham M., Paneth, Eric
• Primary Examiner(s): VANDERPUYE, KENNETH N
• Application Number:
  US10/374,208
• Publication Number:
  US 20030185167A1
• Time in Patent Office: 524 Days
• Field of Search: 370/319, 370/321, 370/337, 370/343, 370/344, 370/347, 370/345, 370/478
• US Class Current: 370/478
• 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 subscriber unit synchronizes to a control channel. An assigned frequency and time slot is transmitted on the control channel to the subscriber unit. The subscriber unit is moved from the control channel to the assigned frequency and time slot. Voice information is received at the subscriber unit. The voice information is digitized and compressed to a lower bit rate. The voice information is transmitted together with an associated control channel from the subscriber unit.

Claims

1. A method for wireless communication comprising the steps of:

synchronizing a subscriber unit to a first control channel;

transmitting an assigned frequency and time slot on said control channel to said subscriber unit;

moving said subscriber unit from said control channel to said assigned frequency and time slot;

receiving voice information at said subscriber unit;

digitizing said voice information;

compressing said digitized voice information to a lower bit rate; and

transmitting said voice information together with an associated control channel from said subscriber unit.

2. The method of claim 1, wherein said associated control channel is a time slot containing a predetermined word.

3. The method of claim 1, further comprising the step of assigning said subscriber unit an unoccupied time slot and frequency.

4. The method of claim 1, further comprising the step of adding link quality information to said associated control channel.

5. The method of claim 1, wherein said subscriber unit transmits and receives in different time slots.

6. The method of claim 1, further comprising the step of up converting from a first frequency to said assigned frequency.

7. In a system including a subscriber unit and a base station, a wireless communication method comprising the steps of:

the subscriber unit transmitting a call request message to the base station to originate a voice call;

the base station establishing synchronization with the subscriber unit via an associated control channel;

the base station transmitting data to the subscriber unit over the associated control channel, the data including a frequency and a time slot to be used by the subscriber unit to establish the voice call;

the subscriber unit receiving voice information;

the subscriber unit digitizing the voice information into voice bit samples;

the subscriber unit reducing the bit rate of the digitized voice bit samples; and

the subscriber unit transmitting the digitized voice bit samples at the reduced bit rate to the base station.

8. The method of claim 7, wherein the reduced bit rate is approximately 14.6 Kbps.

9. The method of claim 7, wherein the bit rate of the voice bit samples is reduced from approximately 64 Kbps to approximately 14.6 Kbps.

10. The method of claim 7, wherein the associated control channel is a radio control channel (RCC).

11. A wireless communication system comprising:

a subscriber unit for transmitting a call request message for originating a voice call; and

a base station for receiving the call request message from the subscriber unit and establishing synchronization between the subscriber unit and the base station via an associated control channel, wherein the base station transmits data to the subscriber unit over the associated control channel, the data including a frequency and a time slot to be used to establish the voice call, and the subscriber unit digitizes voice bit samples of received voice information, reduces the bit rate of the digitized voice bit samples, and transmits the digitized voice bit samples at the reduced bit rate to the base station.

12. The system of claim 11, wherein the reduced bit rate is approximately 14.6 Kbps.

13. The system of claim 11, wherein the bit rate of the voice bit samples is reduced from approximately 64 Kbps to approximately 14.6 Kbps.

14. The system of claim 11, wherein the associated control channel is a radio control channel (RCC).