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   What is RAB? 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. In attached figure the different RABs supported in the P3 WCDMA Radio Access Network are illustrated. 1. Coverage KPI      UL Interference Cell Ratio    Soft HO Ratio 2. Accessibility KPI      RRC Connection Set-up    RAB Set-up    Radio Access Success Rate 3. Retainability KPI      CS Service Drop Ratio    PS Service Drop Ratio 4. Mobility KPI      Soft Handover Success Ratio    Inter-Freq Hard Handover Success Ratio    CS Inter-RAT HO Success Ratio  5. Other Available KPI  Worst Cell Ratio * The conversational speech RAB is tailored to 12.2kbps 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 kbps Circuit Switched (CS) RAB. * The streaming 57.6 kbps is offered to support a specific modem. * The new PS streaming 8/54 kbps RAB will be implemented on DCH. This streaming RAB will be supported only in combination with PS interactive 8/8 kbps RB, no standalone PS streaming RAB will be supported. * The maximum data rate supported by the Interactive RAB (Packet Switched,   PS) is 384 kbps in the downlink and 64 kbps 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.   You would have also mentioned about the types of beares used & they are: 1. Signalling Radio Bearers (SRB): These are used for the exchanges of the control plane (signalling/control messages) which goes through control plane. 2. Radio Bearers (RB): These are used for the data transfer in user plane. All the data are transferred on RBs in CS & PS domains. RAB vs. RB vs. SRB  June 19, 2009 at 3:59 am · Filed under umts ·Tagged Iu bearer, rab, rb, srb, wcdma  The AS provides the NAS with a service of information transfer between UE and the CN in what is named a   Radio Access Bearer (RAB). RAB consists of two: 1. Radio bearer (RB) between the UE and RNC 2. Iu Bearer between RNC and CN  RB is only for user data either in CS or PS mode.   RB is for both user data and signaling. Especially for signaling purpose RB, we call it SRB: In the control plane, the signalling information is transfered through the Signaling Radio Bearer (SRB). However, RAB consists of Iu bearer and user data RB (not SRB).
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