3G UMTS Fundamentals- Radio Access Bearer (RAB) and RRC

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The purpose of a Radio Access Bearer (RAB) is to provide a connection segment using the WCDMA Radio Access Network (WCDMA RAN) for support of a UMTS bearer service. The WCDMA RAN can provide Radio Access Bearer connections with different characteristics in order to match requirements for different UMTS bearers.
The conversational speech RAB is tailored to 12.2 kbit/s Adaptive Multi Rate (AMR) speech and will also be used to carry emergency calls.
Video telephony and ftp services may be offered across the Conversational 64 kbit/s Circuit Switched (CS) RAB.
The streaming 57.6 kbit/s is offered to support a specific modem.
The new PS streaming 8/54 kbit/s RAB will be implemented on DCH. This streaming RAB will be supported only in combination with PS interactive 8/8 kbit/s RB, no standalone PS streaming RAB will be supported.
The maximum data rate supported by the Interactive RAB (Packet Switched, PS) is 384 kbit/s in the downlink and 64 kbit/s in the uplink, making it ideal for email or web browsing.
It is also possible to use the speech RAB together with the interactive RAB that is usually called a MultiRAB.
The Radio Resource Control (RRC) protocol is used in UMTS and LTE on the Air interface. It is a layer that exists between UE and eNB and exists at the IP level. This protocol is specified by 3GPP in TS 25.331[1] for UMTS and in TS 36.331 [2] for LTE. RRC messages are transported via the PDCP-Protocol.
The major functions of the RRC protocol include connection establishment and release functions, broadcast of system information, radio bearer establishment, reconfiguration and release, RRC connection mobility procedures, paging notification and release and outer loop power control.[3] By means of the signalling functions the RRC configures the user and control planes according to the network status and allows for Radio Resource Management strategies to be implemented.[4]

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