Slide 1

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PHICH Dimensioning

15 Mar 2015

#Highly ConfidentialReference No. (9 pt Arial)3/15/2015Summary The Physical Hybrid-ARQ Indicator Channel (PHICH) in the downlink carries Hybrid ARQ (HARQ) acknowledgements (ACK/NACK) for uplink data transfers.PHICH is located in the Subframe 3 and Subframe 8 for TDD Frame Configuration 2.Allocating more resources for PHICH steals resources from PDCCHUpto 24 Ues can be supported by PHICH configuration 1/6 per TTI

#Highly ConfidentialReference No. (9 pt Arial)3/15/2015Calculation

Current maximum scheduled Ues per TTI : 101 PHICH group supports upto 8 Ues per TTINumber PHICH groups can be calculated as in table below according to bandwidthIf phich resolution is set as 1/6 number of Ues supported = 24Occupied REs =12*3=36 REs

#Highly ConfidentialReference No. (9 pt Arial)3/15/2015Trial Stage 1- Choose sites with high Aggregation1 blocking and change PHICHres=1/6

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Stage 2

Increase maximum scheduled Ues per TTI to 12 in sites with PRB utilization is low and user count >30

#Highly ConfidentialReference No. (9 pt Arial)3/15/2015