re: 1xRTT in Korea Still Debugging & Optimizing Across 3 networks
Keith,
<< Why don't we all take a trip to Korea to find out what 3G services are like TODAY >>
Better to read the press since in February the commercial launches finally took place, but the networks appear to be not quite ready for prime time. Nothing particularly unusual about this, even the claims of commercial launches last October.
Recent report by SKT of field tests in the south of Seoul conducted in March indicated good average data rate of 71kbps,. and also indicated a 1.5 times to 2 times increase in voice capacity, and increase in standby time of handsets, and that is positive.
Message 15957786
Despite this the 3 Korean networks are evidently not yet stable
* IS95A/B to IS95 C, or vice versa
* Dozens of possible causes for the interruption in service.
Maybe we should both stay home and wait till we are fully operational here.
Candidly, I believe that both Sprint PCS, and Verizon will proceed very cautiously with rollout. As Qualcomm investors that approach could be frustrating on the short haul, but long haul it should pay dividends.
Credit the Korean carriers for working the kinks out for us again.
>> CDMA 2000 1x Network Still Unstable
By Kim, Sang-ryong
June 20, 2001
Korea eTimes
The cdma2000 1x networks are still unstable - even after several months have passed since their opening. Subscribers using the cdma2000 1x (IS95C) service, located mainly in urban areas, have been experiencing a variety of major and minor problems with the service recently. Mobile phone users in IS95A/B areas have reported malfunctions in hands-off, or data transmission, services and SK Telecom, KTF and LG Telecom, have set about to address the problems.
In some cases related to certain service operators, IS95C phone users suddenly experience poor connections, a rate less than 60% upon moving into IS95A/B areas, because phones fail to recognize frequencies transmitted from base stations in these areas. Coversely, when users travel within IS95A/B or IS95C areas, connection rates are in the order of 90 to 95%.
Service operators believe that the connection gets poorer when subscribers pass through cell boundaries of different service areas, for instance, when moving from IS95A/B to IS95 C, or vice versa. Although they have been adjusting both system algorithms, and software-related operations, they have had difficulties pinpointing the problem given that there are dozens of possible causes for the interruption in service.
The main problem seems to stem from the fact that IS95C base stations were not installed nationwide but rather, only in major cities. Therefore, users speaking on the phone with IS95C terminals in urban areas experience poor connections when they move into IS95A/B areas due to a failure in frequency recognition.
Currently, SK Telecom have set up 1,500 cdma2000 1x base stations in 23 cities nationwide including 7 in Gwangyeok. KTF has set up base stations in 1,300 cities, including the Seoul Metropolitan areas and Daejeon City. LG Telecom is providing the cdma2000 1x service using a channel-switching type throughout its 1,950 base stations nationwide.
"We have confirmed that, in some areas, subscribers are experiencing poor connections when moving from IS95C to B areas," said a service operator. "We are working to address the problem by optimizing networks," he explained.
"The poor connection rate of less than 60% in some areas, is related to hand-off-related situations and other optimization issues. Above all however, it is a matter of investment," said a network management staff memeber for another service operator.
"To address this problem, we cannot simply make large investments in facilities in areas where people do not use mobile phones often," he implied that the poor connection is likely to continue for some time. <<
- Eric - |
