Apparatus for making a random access to the reverse common channel of a base station in CDMA and method therefor

a technology of reverse common channel and random access, which is applied in the field of apparatus for making random access to the reverse common channel of a base station in cdma and the method therefor, can solve the problems of inefficiency of data transmission, inability to make such high-speed data transmission, and ineffective assignment of packet data, so as to reduce the efficiency of data transmission

Inactive Publication Date: 2008-04-22
ELECTRONICS & TELECOMM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]While the conventional ALOHA protocol system employing CDMA can make a stable data transmission in the reverse common channel by performing stably the code synchronization and the tracking thereof with the preamble of a sufficient length even when many data are transmitted through the reverse common channel, th...

Problems solved by technology

Generally, the circuit-switch, which is employed in the present public switched telephone network (PSTN), digital cellular system and personal communication system, is not desirable to make such high speed data transmission because of ineffectively using a limited number of channels.
In this case, it is very ineffective that the packet data is assigned with an exclusive channel as the voiced data.
However, such ALOHA suffers the inefficiency of data transmission performed without any timed schedule ...

Method used

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  • Apparatus for making a random access to the reverse common channel of a base station in CDMA and method therefor
  • Apparatus for making a random access to the reverse common channel of a base station in CDMA and method therefor
  • Apparatus for making a random access to the reverse common channel of a base station in CDMA and method therefor

Examples

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Embodiment Construction

[0029]Referring to FIG. 2, the subscriber's terminal 110 transmits a preamble through the reverse common channel to the base station, which performs the code synchronization to receive the data generated from the terminal. CDMA network 300 controls a plurality of base stations 200, 210, communicating with other networks. PSTN (Public Switched Telephone Network) 400 also communicates with the CDMA network 300 to connect the mobile terminal 110 with the telephone subscriber. Internet 500 also communicates with the CDMA network 300 to connect the terminal 110 with the Internet subscriber. PSDN (Public Switched Data Network) 600 communicates with the CDMA network 300 to connect the terminal 110 with the PSDN subscriber.

[0030]The base station 200 is provided with code synchronization detection information broadcast means for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of ...

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Abstract

An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination, means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.

Description

[0001]NOTE: More than one reissue application has been filed for the reissue of U.S. Pat. No. 6,614,771. The reissue applications are application Ser. Nos. 11 / 218,277, filed Sep. 2, 2005 (the present application), and 11 / 951,939, filed Dec. 6, 2007, which is a continuation reissue application of Ser. No. 11 / 218,277 and is still pending.<?insert-end id="INS-S-00001" ?>BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention concerns an apparatus for making a plurality of cellular phones randomly access a common channel to transmit data in CDMA (Code Division Multiple Access), and a method therefor.[0004]2. Technical Background[0005]Recently, it has been demanded that the mobile communication system may provide data communication services to enable exchanges of moving image and character data together with those of conventional voiced information during movement IMT-2000 (International Mobile Telecommunication-2000) is an international project to dev...

Claims

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Application Information

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IPC IPC(8): H04B7/216H04B1/66H04B7/26H04L12/28H04Q7/38H04B1/69H04B1/707H04L12/56H04W74/08
CPCH04J3/16H04W74/0833H04B7/2637H04B1/707H04W74/08H04B1/7097H04B1/7073
Inventor KIM, TAE JOONGBANG, SEUNG CHANHAN, KI CHUL
Owner ELECTRONICS & TELECOMM RES INST
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