LTE: Does the eNodeB schedule data for an UE in a particular sub frame allocated for the MBMS data transmission ?

Question

I came to know total six subframes of a radio frame can be used for MBSFN transmission. How UE come to know about exact number of sub frames that are being used in a radio frame ? Does the eNodeB send this information to UE or UE itself figure out ?

Answer 1

As per my knowledge, eNodeB does not schedule UE specific data on PDSCH. I meant to say PDSCH channel is not used in radio sub frame which is being used for MBMS data transmission. However, few channels like PHICH, PCFICH, PDCCH and cell specific reference signals are used to in MBMS sub frame. First one or two OFDM symbol in MBSFN sub frame allocated for the control region as in the normal subframe.

Comments

As per specification subframes 1,2,3,6,7,8 are reserved for MBMS data, if in that particular moment if mbms data is not available for that UE thn eNB can schedule that UE for normal data transmission(if normal data available).

For Ex: for UE with rnti-50 have MBMS data and normal data. but SFN-100 SF-2 (SF-2 is normally reserved for MBMS data transmission) mbms data not available to schedule thn eNB can schedule it for normal data transmission.

Note: But all other SFs like 0,4,5,9 are for normal data transmission but these SFs should not use for MBMS eventhough normal data not available in those SFs.

Answer 2

Hi,

Yes, Multimedia data also includes scheduling part. Enb will send DCI with M-RNTI scrambled in PDCCH.