Dual Iub for Flexi WCDMA BTS

Dual Iub allows
• offloading data traffic to alternative
Ethernet path using 3GPP Rel-5/Rel-6
compliant Iub/IP protocol stack
• any Ethernet physical layer (e.g. DSL, ng-
SDH, adaptive modulation microwave..)
may be used
• ATM/TDM for delay critical R’99 voice and
data traffic as well as signaling traffic

Operator benefits
• significant cost savings in backhaul, like
with solution Hybrid Backhaul with Pseudo
Wires
• no external pseudo wire gateway required
at RNC site
• higher peak rates possible as with n*E1s
• BTS synchronisation is done via E1/T1
interfaces

Comments

Aaron Shi said…
Dual Iub implies signalling “delay sensitive” user traffic over ATM while “delay insensitive” user traffic like HSPA is carried over IP connections. This means that AAL2 signalling is only done for traffic which will be transferred via the ATM path afterwards. Traffic which is meant to be transferred over IP will not be signalled via AAL2. Instead the information needed for internal IPC signalling is obtained from Radio Layer Signalling (NBAP) directly.
Dual Iub solution: Ethernet interfaces in RNC and Flexi Multiradio BTS are used in addition to using the existing TDM interfaces Iub/IP over Packet Switched Network (PSN). PSN can be of “low quality” thanks to parallel ATM/TDM path which carries delay and loss critical traffic. "Low quality” here means that there is relatively high delay and relatively low availability compared to TDM.
May 26, 2011 at 5:54 PM
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