Dual mode satellite/cellular terminal

• US 5,812,539 A
• Filed: 03/11/1997
• Issued: 09/22/1998
• Est. Priority Date: 07/12/1995
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Dent, Paul W.
• Primary Examiner(s): TON, DANG T
• Application Number:
  US08/816,054
• Time in Patent Office: 560 Days
• Field of Search: 455/68, 455/69, 455/88, 455/116, 455/522, 455/38.3, 455/422, 370/311, 370/318, 370/310, 370/314, 370/319, 370/322, 370/326, 370/329, 370/334, 370/336, 370/337, 370/341, 370/343, 370/345, 370/346, 370/347, 370/348, 370/342, 370/459, 370/477, 370/321
• US Class Current: 370/321
• CPC Class Codes: H04B 1/408 the transmitter oscillator frequency being identical to the receiver local oscillator frequency
• CPC Class Codes: H04B 7/18532 Arrangements for managing transmission, i.e. for transporting data or a signalling message
• CPC Class Codes: H04B 7/18563 Arrangements for interconnecting multiple systems data switching networks H04L12/00
• 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 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/287 when the channel is in stand-by
• CPC Class Codes: H04W 52/288 taking into account the usage mode, e.g. hands-free, data transmission, telephone
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method and apparatus of communicating information using Time Division Multiple Access and adaptive transmission and reception are disclosed. Signal bursts are transmitted from TDMA transmitters to a TDMA receiver wherein the transmitter codes the information and transmits coded information to the receiver using at least one of two timeslots of a plurality of timeslots in a repetitive TDMA frame period. Both of the two timeslots are received whether or not the transmitter has transmitted using one or two timeslots and the received signals are classified as intended and non-intended. Successively received signals classified as intended are then assembled into a block for decoding to reproduce the information. Also, transmission power levels of the bursts are controlled to compensate for propagation path changes.

Claims

1. A TDMA communication apparatus with improved transmitter power level control, comprising:

burst receiving means for receiving TDMA signal bursts in an allocated receive timeslot of a repetitive TDMA frame period and for measuring received signal strength;

burst transmission means for transmitting TDMA signal bursts in an allocated transmit timeslot of a repetitive TDMA frame period under control of a power control means; and

transmit power control means for computing a desired effective burst transmission power level to compensate for propagation path changes based on said measured received signal strength and controlling said burst transmission means to transmit a signal burst at a controlled power level in said allocated transmit timeslot in each of said TDMA frame periods, wherein said transmit power control means controls said burst transmission means to skip transmission in certain frame periods such that the combination of said controlled power level with the average fraction of frames transmitted provides an effective communication transmit power level equal to said computed desired power level.

2. A TDMA communications apparatus according to claim 1, wherein said certain frame periods are the odd-numbered frame periods.

3. A TDMA communications apparatus according to claim 1, wherein said certain frame periods are the even-numbered frame periods.