| dc.description.abstract | The 5G New Radio (NR) network is developing to accommodate various business requirements and offer extensive coverage to a substantial user population. To handle the growth of traffic, the mini-meter Wave (mmWave) band is utilized, in which the Subcarrier Spacing (SCS) is increased due to the characteristic of high-frequency band. As consequence, the time slot of radio resource scheduling is decreased. The change becomes a new challenge to the scheduling design in the next generation Node B (gNB)。
This thesis proposes that all User Equipment (UE) schedules their uplink transmission in coordinated and distributed manners in order to reduce the scheduling loading in the gNB. To realize it, the essential scheduling information of the scheduler, such as 5G QoS Identifier (5QI), Buffer Status Report (BSR) and other transmission control information, is encapsulated into the Downlink Scheduling Information (DSI). The DSI is sent to the corresponding UEs for performing distributed scheduling by restoring the essential scheduling information required for the scheduler. Every UE preforms scheduling will obtain the same scheduling result, i.e., the Downlink Control Information (DCI) of corresponding UEs, as that derived by the gNB. A UE retrieving the corresponding DCI from the scheduling result looks like it receives the DCI sent from the gNB. As the gNB does not involve the scheduling, the information about the UL resource used by a UE is needed to be encapsulated into an Uplink Scheduling Information (USI) and sent from UE to gNB before UL transmission, in order to make sure that gNB is able to receive the UL data transmitted from UE.
Finally, the open-source program OpenAirInterface5G (OAI) is used in this study for validating the feasibility of the proposed distributed scheduler in 5G NR. By moving the scheduler from the gNB to the UE, the UE based distributed scheduler is put into practice. | en_US |