Section: 5.6.1 Architecture Principles for E-UTRAN to GERAN NACC
Content: Introducing NACC from E-UTRAN to GERAN follows the principles of the Network Assisted Cell Change between UTRAN and GERAN as described in TS 25.413[ UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling ]  [22] and TS 23.060[ General Packet Radio Service (GPRS); Service description; Stage 2 ]  [7]. It specifies the RAN Information Management (RIM) procedures as specified in clause 5.15 and depicted in figure 5.6-1. Figure 5.6-1: E-UTRAN to GERAN NACC basic network architecture The support for the NACC from E-UTRAN to GERAN has the following impacts on E-UTRAN / GERAN architecture: - Affected nodes: BSC, eNodeB, MME, SGSN; - Affected network interfaces: Gb, Iu, S3, Gn, S1; - Affected radio interfaces: Um and Uu.