As has also been point out recently, the existing 3GPP UMA/GAN specification was one of a few architectures being considered as the basis for a formal 3GPP femtocell standard. The net result is that the UMA/GAN standard, as is, was not chosen. Sad but true. In order to reach an industry consensus on a HNB architecture there was a measure of compromise from all the participating companies. That’s the nature of standards: compromise.
However, while the HNB reference architecture is not full UMA/GAN, it adopts a number of key principles first introduced in the 3GPP GAN standard. For example, at the highest level, it follows an access-based (rather than core-based) approach, leveraging the existing Iu-cs/Iu-ps interfaces into the core service network. It also identifies the use of a specific protocol for solving a number of challenges associated with the ad-hoc deployment of devices over the internet.
Frankly, while the UMA community would have been delighted if 3GPP had adopted GAN lock-stock-and barrel (as they say in the
ThinkFemtocell has a good breakdown of different elements of the work.
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