KEYWORDS: LTE, Admission Control, Downlink Scheduling, OFDM, MAC, RLC, PDCP, PDSCH, PDCCH, FDD, OPNET Modeler.
All the sublayers use one of the six downlink channels (PBCH, PFCICH, PDCCH, PHICH, PDSCH and PMCH) to communicate with each other and with radio interface.
After the admission control the next step was to devise a scheduling algorithm that can take care of the Non-GBR radio bearers in terms of handing over to the channel some additional bandwidth by taking extra space from the Downlink Control Channel (PDCCH) which would have been wasted otherwise and hand it over to the Downlink Shared Channel (PDSCH).
For each allocation, control information is created in PDCCH. The equal capacity sharing algorithm is fair to all equal priority queues, as the resource distribution is done evenly.
The value for the cyclic prefix is the same as 7 symbols per slot and 3 PDCCH symbols per sub-frame which is a conservative estimate while admitting radio bearers into the system.
The PDCCH number of columns is close to 1 and the PDSCH is not completely 100% utilized which resulted in such better response times for the UE's as shown in Figure 13.