Sep 2, 2005 - CDMA) chie?y developed in Europe and Japan. The future lMT-2000 system is to support both voiced data and
USO0RE40253E
(19) United States (12) Reissued Patent
(10) Patent Number: US (45) Date of Reissued Patent:
Kim et a]. (54)
APPARATUS FOR MAKING A RANDOM
5,721,733 5,838,669 6,078,572 6,240,083
ACCESS TO THE REVERSE COMMON CHANNEL OF A BASE STATION IN CDMA AND METHOD THEREFOR
(75) Inventors: Tae Joong Kim, SeongNam (KR); Seung Chan Bang, Daejon (KR); Ki Chul Han, Daejon (KR) (73) Assignee: Electronics and Telecommunications Research Institute (KR)
(21) Appl. No.: 11/218,277 (22) Filed: Sep. 2, 2005
Filed:
Oct. 29, 1998
(30)
OTHER PUBLICATIONS
Taeiloon Kim et al.; “On Performance Improvements of Spread Slotted Aloha Network With CLSP/CC”; IEICE Trans Fundamentals, vol. E80iA, No. 12; pp. 2493*2499; 1997.
Masato Saito et al.; “Throughout Improvement of CDMA Slotted ALOHA Systems”; IEICE Trans. Commun. vol. E8WB, No. 1; pp. 74*79; 1997.
Primary ExamineriAfsar Qureshi
Foreign Application Priority Data
May 4, 1998
(74) Attorney, Agent, or FirmiHunton & Williams, LLP
(KR) .......................................... .. 98-16019
(57) (51)
Wang et a1. Gerakoulis Tanno et a1. Wright et a1.
nal on Selected Areas in Communications, vol. 12, No. 4; 1994.
Reissue of:
6,614,771 Sep. 2, 2003 09/181,970
2/1998 11/1998 6/2000 5/2001
Apr. 22, 2008
Kiyoshi Toshimitsu et al.; “A Novel Spread Slotted Aloha System With Channel Load Sensing Protocol”; IEEE Jour
Related US. Patent Documents
(64) Patent No.: Issued: Appl. No.:
A A A B1
RE40,253 E
Int. Cl. H04B 7/216 H04B 1/66 H04B 7/26 H04L 12/28
(2006.01) (2006.01) (2006.01) (2006.01)
H04Q 7/38
(2006.01)
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 informa tion broadcast means provided in the base station for broad casting the state information of a channel card in real time
for the terminals to recognize the code synchronization (52)
US. Cl. ..................... .. 370/335; 370/338; 370/342;
375/240.26; 375/149 (58)
detection When the code synchronization of a certain data is
acquired through performing the code synchronization of the
Field of Classi?cation Search ....... .. 370/312*338,
preambles transmitted from the terminals through the
370/342i350, 465, 475, 474; 375/l34il50,
reverse common channel, and data transmission
375/240.24, 240.25, 240.26, 240.27 See application ?le for complete search history. (56)
References Cited
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.
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