RLC UM mode is used to deliver/receive the messages from DL/UL DTCH, MCCH and MTCH. Here segmentation and reassembly of RLC SDUs will be performed. RLC Headers are added/removed. It will not guarantee delivery. Functions performed by RLC UM Transmitting Entity 1. It will receive …
1. Understanding contention based random access procedure. If 2 UE choose the same preamble sequence and send this sequence to eNB at the same time, this leads to collision. For example, if 2 UE send the same preamble sequence at the same time, there are 2 …
Introduction: RACH stands for Random Access CHannel. UE will perform power on procedure for DL synchronization. UE will perform RACH procedure for UL synchronization. In LTE there is a separate channel called as PRACH (Physical Random Access CHannel) that is provided for initial access to network. …
MAC Scheduler is used to assign bandwidth to UE in uplink and downlink channels. eNB will decide for which UE how many resources to be allocated. MAC scheduler will also enforce QOS like priority, bit rate and latency for different UE connections. How MAC Scheduler works? …
What is the need of timing Advance command? UE will not be in stationary position. It will be moving far away or moving near with respect to eNB. The difference in the distance will reflect in UL transmission time. Because of this, eNB will face interference …
WKT UE will receive downlink data over PDCCH. So UE has to monitor PDCCH everytime to check if there is any downlink data available. By doing so, UE will loose battery very quickly. So to save battery life UE will go to sleep and wakeup at …
In LCP, Prioritize Bit Rate (PBR) is added to each logical channel. Hence while filling the MAC PDU, first it will take and add the minimum data i.e PBR from all the channels into the MAC PDU. After that if there are any space left in …
dlInformationTransfer Direction: eNB => UE Signalling Radio Bearer: SRB2 or SRB1 RLC Mode: AM Logical Channel: DCCH Transport Channel: DL-SCH eNB sends dlInformationTransfer procedure to transfer NAS or non-3GPP dedicated information. It uses either SRB1 (if SRB2 is not established) or SRB2. The IE “dedicatedInfoType” will …