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"Signalling Radio Bearers" (SRBs) are defined as Radio Bearers (RB) that are used only forthe transmission of RRC and NAS messages. More specifically, the following three SRBs are

defined:- SRB0 is for RRC messages using the CCCH logical channel;- SRB1 is for RRC messages (which may include a piggybacked NAS message) as wellas for NAS messages prior to the establishment of SRB2, all using DCCH logical channel;- SRB2 is for NAS messages, using DCCH logical channel. SRB2 has a lower-priority thanSRB1 and is always configured by E-UTRAN after security activation.

Default bearer is created at attach > fast access to services

Additional default bearers may be created when simultaneous access to

services available via multiple APNs is needed

Creation of an additional dedicated bearer is initiated by UE -> max 1 DRB perUE supported in RL10

Default bearers are always non-GBR bearers

Dedicated bearers (non-GBR or GBR) are created for QoS differentiation

purposes

The IP address allocated for the default bearer is used for the dedicatedbearers within the same PDN connection

Creation of a dedicated bearer is initiated by network

RL10 only non-GBR dedicated bearers

For each EPS bearer (default and dedicated), QoS support is based on

QoS parameters

Available in subscriber profile

Controllable by the network

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Default bearer is created at attach > fast access to services

Additional default bearers may be created when simultaneous access to

services available via multiple APNs is needed

Creation of an additional dedicated bearer is initiated by UE -> max1 DRB per UE supported in RL10

Default bearers are always non-GBR bearers

Dedicated bearers (non-GBR or GBR) are created for QoS differentiation

purposes

The IP address allocated for the default bearer is used for thededicated bearers within the same PDN connection

Creation of a dedicated bearer is initiated by network

RL10 only non-GBR dedicated bearers

For each EPS bearer (default and dedicated), QoS support is based on

QoS parameters

Available in subscriber profile

Controllable by the network

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qciSupp in structure qciTab9 must be set to 'ENABLED' if actNonGbrServiceDiff isset to 'false'

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The support of EPS bearers with QCI=1 can be enabled / disabled per eNB via O&M.

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