Security Level: www.huawei.com LTE RS Power Calculation-04052016 HUAWEI TECHNOLOGIES CO., LTD. RS Power Calculation Type A symbols are those that appear during a symbol period when there is no reference signal. Type B symbols are those that appear during a symbol period when there are reference signals. The ratio of PDSCH EPRE to cell-specific RS EPRE among PDSCH REs (not applicable to PDSCH REs with zero EPRE) for each OFDM symbol is denoted by either A or B A =P(Type A RE)/P(RS RE) B =P(Type B RE)/P(RS RE) PA=ρA PB=ρB/ρA So: PA= P(Type A RE)/P(RS RE) PB= P(Type B RE)/ P(Type A RE) B / A PB One 0 1 2 3 1 4/5 3/5 2/5 Two and Four Antenna Ports 5/4 1 3/4 1/2 The PB configured on eNodeB is the index of B / A HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential RS Power Calculation For cells whose maximum transmit power per channel in an RRU is 60 W, the following relationships among bandwidth, reference signal power, and PB apply: - In a cell with a 20 MHz bandwidth and PA is equal to -3, if PB is set to 0, 1, 2, or 3, the value range of the corresponding reference signal power is 63 to 193, 70 to 200, 70 to 200, or 70 to 200 (unit: 0.1 dBm) respectively. - In a cell with a 20 MHz bandwidth and PA is equal to 0, if PB is set to 0, 1, 2, or 3, the value range of the corresponding reference signal power is 40 to 170, 40 to 170, 40 to 170, or 40 to 170 (unit: 0.1 dBm) respectively. To achieve 100% power usage, the total power of each symbol (1 TTI has 14 symbols) should be same, with PA,PB (-3,1) and (0,0), this target can be realized HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential RS Power Calculation (PA,PB)= (-3,1): 1RB in type A symbol contains 12 type A RE, equals to 6 RS RE; 1RB in type B symbol contains 8 type B RE and 2 RS RE, equals to 6RE; So the total power of type A symbol is equal to type B symbol, it means In time domain the RRU transmitting time is the same all the time, can reach 100 percent usage; With RRU per port max 60W currently, every symbol contain 100RB*6RS RE=600 RS RE, so RS power=60W/600RS RE=100mw=20dBm HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential THANK YOU WWW.HUAWEI.COM HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential