99 lines
3.1 KiB
Plaintext
99 lines
3.1 KiB
Plaintext
[[overview]]
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== Overview
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[[intro_overview]]
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=== About OsmoHNBGW
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OsmoHNBGW implements the Home NodeB Gateway function in the 3G network architecture. It serves
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as a gateway between the classic 3G core network (CN) domain with its IuCS and IuPS interface
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and the femtocell based RAN.
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A typical 3G network consisting of Osmocom components is illustrated in the following
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diagram:
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[[fig-3g]]
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.Typical 3G network architecture used with OsmoHNBGW
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[graphviz]
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----
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digraph G {
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rankdir = LR;
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UE [label="UE\n(3G phone)"]
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PBX [label="PBX\nAsterisk, FreeSwitch,\nKamailio, Yate, ..."]
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subgraph cluster_msc_mgw {
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style=dotted
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MSC
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MGW1 [label="MGW"]
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MSC -> MGW1 [label="MGCP",constraint=false]
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}
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subgraph cluster_hnbgw_mgw_upf {
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style=dotted
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MGW3 [label="MGW"]
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UPF
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HNBGW [label=HNBGW,style=bold]
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HNBGW -> MGW3 [label="MGCP",constraint=false]
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HNBGW -> UPF [label="PFCP",constraint=false]
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}
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hNodeB [shape="box",label="hNodeB\n(3G femto cell)"]
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MSC -> HLR [label="\nGSUP",style=bold]
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SGSN -> HLR [label="GSUP",style="dashed,bold"]
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UE -> hNodeB [label="Uu",style=bold]
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UE -> hNodeB [style="dashed,bold"]
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hNodeB -> HNBGW [label="Iuh",style="bold"]
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STP2 [label="STP\n(SCCP/M3UA)"]
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HNBGW -> STP2 -> SGSN [label="IuPS",style="dashed,bold"]
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HNBGW -> STP2 -> MSC [label="IuCS",style="bold"]
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SGSN -> GGSN [label="GTP-C",style="dashed,bold"]
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hNodeB -> UPF -> GGSN [label="GTP-U(3G)",style="dashed"]
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GGSN -> internet [label="tun",style="dashed"]
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hNodeB -> MGW3 [label="IuUP/RTP",constraint=false]
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MGW3 -> MGW1 [label="IuUP/RTP"]
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MSC -> SIPConnector [label="MNCC socket",style=bold]
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SIPConnector -> PBX [label="SIP",style=bold]
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MGW1 -> PBX [label="RTP"]
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A, B, C, D [style="invisible"]
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A -> B [label="data (PS)",style="dashed"]
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C -> D [label="voice/SMS/USSD (CS)"]
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}
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----
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The HNB-GW performs a translation interface between the IuCS/IuPS interfaces on the one hand
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side, and the Iuh interface on the or ther hand:
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----
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Iuh IuCS/IuPS
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+----+----+
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| CC | MM |
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NAS +----+----+ . . +----+----+
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Non-Access Stratum | CC | MM | . | RANAP |
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- - - - - - - - - - - +----+----+-------+ +---------+
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| RANAP | | H | SCCP |
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Access Stratum +---------+ HNBAP | N +---------+
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| RUA | | B | M3UA |
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+---------+-------+ - +---------+
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| SCTP | G | SCTP |
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+-----------------+ W +---------+
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| IP | | IP |
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+-----------------+ +---------+
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----
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On the femtocell (Home NodeB) side, OsmoHNBGW implements the Iuh interface as specified by 3GPP.
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=== The Iuh interface
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Iuh consists of the following sub-layers:
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- HNBAP (Home NodeB Application Part)
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- RUA (RANAP User Adaptation, between RANAP and SCTP
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