Tải bản đầy đủ

1639903522 LTE power settings

LTE Technology

Page 1 of 3

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 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

file://C:\Program Files\iBwave\iBwave Design\Documentation\WebHelp\project_properties... 6/1/2011



LTE Technology

Page 2 of 3

systems 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
CHANNEL
BANDWIDTH

NUMBER OF
SUBCARRIERS
PER
RESOURCE
BLOCK

TOTAL
NUMBER
OF
SUBCARRIERS

TOTAL
POWER

TOTAL
POWER

[MHz]

NUMBER
OF
RESOURCE
BLOCKS

POWER PER
RE
(Tx_RE_dlrs)

[mW]

[dBm]

5

25

12

300

250

24.0

-0.8

10

50

12

600

250

24.0

-3.8

15

75

12

900

250

24.0

-5.6

20

100

12

1200

250

24.0

-6.8

TOTAL
NUMBER
OF
SUBCARRIERS

TOTAL
POWER

TOTAL
POWER

POWER PER
RE
(Tx_RE_dlrs)

[W]

[dBm]

System (RF source) power maximum power set at 43 dBm
CHANNEL
BANDWIDTH

NUMBER OF
SUBCARRIERS/

[MHz]

NUMBER
OF
RESOURCE
BLOCKS

5

25

12

300

20

43.0

18.2

10

50

12

600

20

43.0

15.2

15

75

12

900

20

43.0

13.5

20

100

12

1200

20

43.0

12.2

TOTAL
NUMBER
OF
SUBCARRIERS

TOTAL
POWER

TOTAL
POWER

POWER PER
RE
(Tx_RE_dlrs)

[W]

[dBm]

RESOURCE
BLOCK

System (RF source) power maximum power set at 46 dBm
CHANNEL
BANDWIDTH

NUMBER OF
SUBCARRIERS/

[MHz]

NUMBER
OF
RESOURCE
BLOCKS

5

25

12

300

40

46.0

21.2

10

50

12

600

40

46.0

18.2

RESOURCE
BLOCK

file://C:\Program Files\iBwave\iBwave Design\Documentation\WebHelp\project_properties... 6/1/2011


LTE Technology

Page 3 of 3

15

75

12

900

40

46.0

16.5

20

100

12

1200

40

46.0

15.2

WHAT WOULD YOU LIKE TO DO?
Set LTE Network Optimization Properties
Create an LTE Output Map

file://C:\Program Files\iBwave\iBwave Design\Documentation\WebHelp\project_properties... 6/1/2011



Tài liệu bạn tìm kiếm đã sẵn sàng tải về

Tải bản đầy đủ ngay

×