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Donor -eNodeB Functionality
Posted on 10. Jan, 2013 by tmutlu
Hi;
We are trying to estimate the extra effort for a Donor-eNodeB different from an eNodeB.
It is written at 36.300 overall description that DeNB has S1/X2 proxy functionality and S11 termination point and S/GW, P/GW function for supporting RN.
But It is not clear if the P-GW functions are all necessarily located in the DeNB or if some of the functions only located in DeNB. For instance these gateways has DPI ( Deep Packet Inspection ) properties. ( I think it is for Lawful Interception). This property needs a different yonga means different hardware!! Does it really necessary ?
Is there any document about these subject, i couldnt find any.
Thanks..
See 3GPPi 23.401, as 3GPP has
See 3GPP 23.401, as 3GPP has not specified Lawful interception function at DeNB, I believe its out of scope.
Few references from above spec below
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The RN supports the eNB functionality like termination of the radio protocols of the E-UTRA radio interface and the S1 and X2 interfaces. The RN also supports a subset of the UE functionality and protocols to wirelessly connect to the DeNB.
In addition to supporting eNB functionality, the DeNB also embeds and provides the S-GW/P-GW-like functions needed for the RN operation. This includes creating a session for the RN and managing EPS bearers for the RN as shown in clause 4.3.20.3, as well as terminating the S1-AP and S11 interfaces towards the MME serving the RN. Due to the proxy functionality, the DeNB appears as an MME (for S1), an eNB (for X2) and an S-GW to the RN.
The RN and DeNB also perform mapping of signalling and data packets onto EPS bearers that are setup for the RN. The mapping is based on existing QoS mechanisms defined for the UE and the P-GW and are described in TS 36.300 [5].
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DeNB provides the necessary S/P GW functions for the operation of RNs connected to the DeNB.
In order to provide the Relay Function the DeNB shall support the following P-GW functions:
- IP address allocation for the UE functionality of the RN;
- Downlink transport level packet mapping between the DSCP value used over S1-U of the UE (which is the SGi interface of the PGW function in the DeNB) and the EPS bearers with an appropriate QCI value established between the PGW function in the DeNB and the UE function of the RN;
- Uplink transport level packet mapping between QCI value of the EPS bearers (established between the PGW function in the DeNB and the UE function of the RN) and the DSCP value used over S1-U of the UE (which is the SGi interface of the PGW function in the DeNB).
In order to provide the Relay Function the DeNB shall support the following S-GW functions:
- Termination the S11 session of the MME(RN).
S-GW functions related to ECM-IDLE are not required.
S-GW functions related to mobility management are not supported.