engineer, Clark, et al> Questions re: EDGE, IS-136, and Mobile IP
These quotes are from gsmdata.com
The tricky part of adopting EDGE is that IS-136 networks use 30 kHz radio channels. Deploying EDGE will require new radios in base stations to support the 200 kHz data channels.
Now, there has been speculation and perhaps news that ATT is going straight to EDGE (skipping GPRS). GP has said that this will be expensive and difficult. Is this (replacing 30KHz BS radios with 200KHz) the reason why? How does that affect existing subscriber terminals, if at all? Is there a CDMA overlay in the works that would be more cost-effective to implement?
One issue in harmonizing CDMA data is that WCDMA is based on GPRS protocols, which use the GPRS tunneling protocol (GTP) to forward IP packets to the mobile station. Mobility management is also handled by specific GPRS protocols. CDMA2000, however, is based on the Mobile IP standard. Any harmonized CDMA standard should ideally be based on the same set of tunneling and mobility standards. For this reason, the European Telecommunications Standards Institute (ETSI), responsible for GSM and GPRS, has started an investigation of how GPRS/EDGE could integrate Mobile IP.
Right now, is Mobile IP a CDMA2000-only "thing"? Is there a reason why it is superior to GPRS-specific protocols, and should be adopted by carriers coming from a GPRS upgrade path? Also, are there any other salient differences between W-CDMA and CDMA2000 that we should be looking at?
Thanks, MM |
