35 Series Security algorithms 36 Series LTE (Evolved UTRA) and LTE-Advanced radio technology 37 Series Multiple radio access technology aspects Table 2.4 3GPP specification version numbers Version Description Early draft 60% ready draft - ready to be presented to the TSG for information Above 80% ready draft - ready to be approved by the relevant TSG when finalized Specification has been approved by the relevant TSG for the 3GPP Release indicated in the version number We did briefly mention the document version numbers in Section 2.1.1. The meaning of the version numbers is shown in Table 2.4. Obviously, it is hard to know when something is 60% or 80% ready. Therefore, this practically means that in version 1 there is agreement on the way forward, and there is some feeling that the WG is getting its head around the concept. Version 2 means that the concept is all documented and there are just a few details to be worked out. However, as with all projects, those last details can take a surprisingly long time. When the specification has been approved by the relevant TSG the document version is set to the release in which it is to be published. 2.1.2 IETF Standardization Process In Chapter 1 we described the IETF as the main SDO for the Internet protocols. Therefore, it is also a very important SDO for the 3GPP system. The IETF protocols are used within Deploying IPv6 in 3GPP Networks Applications General Internet Operations and Management Real-time Applications and Infrastructure Routing Security Transport IETF WGs Figure 2.2 IETF organization. the 3GPP system, and the service that the 3GPP system provides is the transport of the Internet protocol. Therefore, in our books, the IETF merits the ranking of second most important SDO for the 3GPP system. The IETF standardization process is quite a bit different from the 3GPP process. Hence, they should not be compared directly - it would not do justice to either of these fine organizations. The work in the IETF is performed by WGs. These WGs are organized into areas base