doc: tweak protocols ascii art
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Who Talks What Around the Home Node B Gateway
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=============================================
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(wip 2016-01-11)
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Protocols Around the Home Node B Gateway
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========================================
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+------------+ +--------+ +----------+
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UE <-->| hNodeB |<--Iuh---->| HNB-GW |<--IuCS-->| OsmoCSCN |
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UE <-->| femto cell | ...-->| | +----------+
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| | | |
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UE <-->| femto cell | ...-->| | ...-->| |
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| | | | +----------+
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+------------+<--GTP-U | |
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\ | | +------+ +------+
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| | |<--IuPS-->| SGSN |<--GTP-C-->| GGSN |
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| +--------+ +------+ GTP-U-->| |
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| / +------+
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| +--------+ ...-->| | GTP-U-->| |
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| +------+ / +------+
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\_______________________________/
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