Home > Project Properties > Calculations > LTE Technology SET LTE TECHNOLOGY PROPERTIES With the LTE technology, several power downlink settings need to be defined for the corresponding
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SET LTE TECHNOLOGY PROPERTIES
With the LTE technology, several power downlink settings need to be defined for the corresponding LTE signals These signals are:
Reference Signal (RS): This signal is similar to pilot signal in CDMA technology It is always transmitted
by LTE eNodeB, and is used by mobile to rank different LTE sectors according to signal strength
Physical Broadcast Channel (PBCH): This signal transmits a limited number of the most frequently transmitted parameters essential for initial access to the cell
Synchronization Signal (SS): Primary (P-SS) and Secondary (S-SS) synchronization signals enable time and frequency synchronization between eNodeB and UE
Physical Downlink Control Channel (PDCCH): This signal carries information about UE resource
assignment and other control information
Physical Downlink Shared Channel (PDSCH): This signal is the main data bearing downlink channel in LTE It is shared among all users, but it also carries paging messages as well as some broadcast system information not carried on PBCH signal
1 In the Project Properties, click Calculations > LTE technology
2 Set the values for LTE transmit power settings
Tx_RE_dlrs: Transmit power per resource element for downlink reference signal (RS) given in dBm
(Default is 0 dBm.)
Tx_RE_Offset_pbch: Transmit power offset for physical broadcast channel (PBCH) relative to
TX_RE_dlrs given in dB
(Default is 0 dB.)
Tx_RE_Offset_ss: Transmit power offset for primary synchronization channel (P-SCH) and secondary synchronization channel (S-SCH) relative to Tx_RE_dlrs given in dB
(Default is 0 dB.)
Tx_RE_Offset_pdcch: Transmit power offset for Physical Downlink Control Channel (PDCCH) relative to Tx_RE_dlrs
(Default is 0 dB.)
Tx_RE_Offset_pdsch: Transmit power offset for Physical Downlink Shared Channel (PDSCH) relative to Tx_RE_dlrs
(Default is 0 dB.)
The above power settings are not independent of each other The following sets of power checks must be satisfied otherwise a warning message is displayed, and transmit power levels will need to be re-entered Click here for suggested power level values
Num OFDM for PDCCH: Number (1, 2, 3) of OFDM symbols reserved for PDCCH in the first slot of the subframe
In the above example, Num OFDM for PDCCH is set to 1
NOTE
These settings can be redefined when you add a system using LTE technology
3 When the Apply these default values to all sources of all systems check mark is selected, all the power values in the existing systems are replaced with these values, and these values also become
default values for future systems
When this check mark is cleared, these values become default values for future systems only; the existing
Trang 2systems keep their values
4 Click OK to save and close the Project Properties
SUGGESTED POWER LEVEL VALUES
The following table lists suggested power level values under the assumption that all offsets are set to 0, and the N_odfm_pdcch is set to 1
From these examples, it is possible to compute Power per RE (Tx_RE_dlrs) levels for other maximum system power levels
System (RF source) power maximum power set at 24 dBm
System (RF source) power maximum power set at 43 dBm
System (RF source) power maximum power set at 46 dBm
CHANNEL
BANDWIDTH
[MHz]
NUMBER
OF RESOURCE BLOCKS
NUMBER OF SUBCARRIERS PER
RESOURCE BLOCK
TOTAL NUMBER
OF SUBCARRIERS
TOTAL POWER [mW]
TOTAL POWER [dBm]
POWER PER
RE (Tx_RE_dlrs)
CHANNEL
BANDWIDTH
[MHz]
NUMBER
OF RESOURCE BLOCKS
NUMBER OF SUBCARRIERS/
RESOURCE BLOCK
TOTAL NUMBER
OF SUBCARRIERS
TOTAL POWER [W]
TOTAL POWER [dBm]
POWER PER
RE (Tx_RE_dlrs)
CHANNEL
BANDWIDTH
[MHz]
NUMBER
OF RESOURCE BLOCKS
NUMBER OF SUBCARRIERS/
RESOURCE BLOCK
TOTAL NUMBER
OF SUBCARRIERS
TOTAL POWER [W]
TOTAL POWER [dBm]
POWER PER
RE (Tx_RE_dlrs)
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W H A T W O U L D Y O U L I K E T O D O ?
Set LTE Network Optimization Properties
Create an LTE Output Map