User`s guide

Agilent PXT Wireless Communications Test Set
User’s Guide
119
Special Subframe Configuration
This parameter controls the configuration of the special subframe. It determines how many symbols of the
subframe are used for downlink transmission and how many are used for the uplink transmission. In the
scenario file, it appears in SIB1, with the name specialSubframePatterns.
It is recommended that you use the special subframe value of 4 for this parameter
because of the following information:
The PXT does not support re-transmissions at the MAC layer. It has an algorithm
which checks what the coding rate is before sending a transport block. If the coding
rate is greater than 0.93, it assumes that the UE cannot decode it and will not send it.
With some of the special subframe configurations, there are relatively few DL
symbols on the special subframe. Therefore, with MCS = 28, there is not enough
space to fit a large transport block into the symbols available without causing a
coding rate greater than 0.93. Special subframe configuration 4 has the most DL
symbols available and therefore has the most physical channel resource available to
transmit the DL data.
Mode
BSE, TDD
Overwrites Scenario File Value
Yes
Range
0 - 8
Preset
6
Initial S/W Revision 6.4
Subframe 0 supported in 6.5.
Key Path
BSE > Mode Setup> More > RRC Settings More > More > SIB1
SMC
Accesses the Security Mode Command menu.
Mode
BSE
Overwrites Scenario File Value
Yes
Initial S/W Revision
6.4
Key Path
BSE > Mode Setup> More > RRC Settings More > More >