US 6,005,854 AGranted

Synchronous wireless access protocol method and apparatus

AssigneeCwill Telecommunication, Inc.

InventorsGuanghan Xu, Yucong Gu, Wei Chen, Ying Chen, Peiwei Wang, Shihe Li

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Abstract

A wireless communication system has a protocol enabling synchronous code division multiple access (CDMA) communication on a time division duplex (TDD) frequency, and provides for a smart antenna system as an integral component of the system. The protocol has downlink time slots (DTS) which provide for synchronization and paging of all remote terminals from a base station on a omnidirectional code channel and while providing for traffic signals on directional traffic channels. The protocol has uplink time slots (DTS) which enable rapid link requests by remote terminals, as well as enabling improved spacial estimation, synchronization and power control of remote terminals by the base station.

Claims13

Dependent claims

a controller for controlling operation of the remote terminal in an access mode and a traffic mode;
a first synchronization generator responsive to said controller for generating a first synchronization signal;
a second synchronization generator responsive to said controller for generating a second synchronization signal;
a data modulator responsive to said controller for generating modulated information signals;
and
a transmitter coupled to said first synchronization generator, said second synchronization generator and said data modulator for generating a radio frequency modulated transmit signal indicative of the first and second synchronization signals and the information signals in response to said controller, wherein,
in the access mode, said controller enables said transmitter and said first synchronization generator in the first portion, disables said transmitter in the second portion, and enables said data modulator and said transmitter in the third portion during a first frame of the plurality of frames, and
in the traffic mode, said controller disables said transmitter in the first portion, enables said transmitter and said second synchronization generator in the second portion, and enables said transmitter and said data modulator in the third portion during a second frame of the plurality of frames subsequent to the first frame.

5 more elements

In a communication system having a plurality of frames for communication from a plurality of remote terminals to a base station on a common carrier having a plurality of concurrent code channels, each frame of the plurality of frames having a first portion for first synchronization, a second portion for second synchronization, and a third portion for communicating information from the plurality of remote terminals to the base station, a method in a remote terminal comprising the steps of:

acquiring a first of the plurality of code channels with the base station by,
enabling a transmitter within the remote terminal and transmitting a first synchronization signal during the first portion,
disabling the transmitter during the second portion, and
enabling the transmitter and transmitting access information including an identification signal unique to the remote terminal in the third portion;
and
in response to a signal from the base station granting the first code channel, maintaining the first code channel by,
disabling the transmitter during the first portion,
enabling the transmitter and transmitting a second synchronization signal during the second portion, and
enabling the transmitter and transmitting message information during the third portion.

6 more elements

Dependencies are inferred from the claim text.