The fact that Sprint is welcoming LTE vendors to respond to its RFP for upgrading its legacy CDMA network is no surprise -- in fact, it's no different than the line that the carrier has been taking for well over a year now. What is a bit of a surprise, though, is that it appears to be every bit as ambivalent about the direction of its 4G technology path as ever. The current RFP is strictly for an upgrade of Sprint's "core" network, meaning its legacy (if you can call 2G / 3G "legacy") footprint comprised solely of CDMA; its WiMAX assets aren't affected this time around. In fact, the company's VP of product and technolog
