02:35 - 
Quick Notes
2 comments
Quick Notes
2 comments
Scheduling operation in LTE
Basic Scheduling Operations:
- Purpose
* Efficient SCH(Data) Resources Assignments
- Consideration
* Traffic Volume, QoS (Buffer Status, Priority…)
* Channel Condition
- Scheduling Interval
* Dynamic Scheduling by MAC : One TTI (1ms : One Sub-frame)
* Semi-Persistent for VoIP : Multiple TTIs by RRC
- Resource Assignment : PRBs & Associated MCS
Scheduling information: DCI PDCCH
Resource Assignment
- Per UE # PRBs Assignment
* Channel Dependent Resource Allocation
•User Assignment based on Channel Quality
- CQI / MCS / TBS
- Purpose
* Efficient SCH(Data) Resources Assignments
- Consideration
* Traffic Volume, QoS (Buffer Status, Priority…)
* Channel Condition
- Scheduling Interval
* Dynamic Scheduling by MAC : One TTI (1ms : One Sub-frame)
* Semi-Persistent for VoIP : Multiple TTIs by RRC
- Resource Assignment : PRBs & Associated MCS
Scheduling information: DCI PDCCH
DCI
Resource Assignment
- Per UE # PRBs Assignment
* Channel Dependent Resource Allocation
•User Assignment based on Channel Quality
- CQI / MCS / TBS
CQI Reporting for Scheduling
Reporting modes
- In time : Periodic (PUCCH/PUSCH) & Aperiodic (PUSCH)
- In Frequency
• Wide-band CQI : 4 bit
• Differential Sub-band CQI : 2 bit (Sub-band CQI – Wideband CQI)
• Differential Spatial CQI : 3bit for MIMO
Schedulers in LTE
DL Scheduling
DL MAC Scheduler
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