Section: Annex B (normative): Contention resolution for RACH access
Content: When checking whether contention resolution was successful a MAC entity considers the MAC header structures shown below for the processing of a MAC PDU containing a UE Contention Resolution Identity MAC control element. Figure B-1: MAC header structures containing a UE Contention Resolution Identity MAC control element NOTE 1: For Case 1 (only Contention Resolution ID is carried), the resulting MAC PDU content is of fixed size and UE interprets the rest of MAC PDU data (if any) as padding without MAC subheader for padding. NOTE 2: For Case 2 to Case 6, LCID of '00001' is applicable only when UE supports the CIoT EPS User Plane optimisation. NOTE 3: Case 7 and Case 8 are only applicable to EDT when the UE supports the CIoT EPS User Plane optimisation. For NB-IoT UE, n is 1 or 2. For BL UE or a UE in enhanced coverage, n is from 1 to 8. NOTE 4: In Case 7, if n is 1, there is no L field after the subheader of MAC SDU for DTCH.