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25.945
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5.4.2 Demodulation in static propagation conditions
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25.945
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5.4.2.1 Demodulation of DCH
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The performance requirement of DCH in static propagation conditions is determined by the maximum Block Error Ratio (BLER). The BLER is specified for each individual data rate of the DCH. DCH is mapped into the Dedicated Physical Channel (DPCH).
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
5.4.2.1.1 Minimum requirement
|
For the parameters specified in Table 5.22 the BLER should not exceed the piece-wise linear BLER curve specified in Table 5.23.
Table 5.22: DCH parameters in static propagation conditions
Parameters
Unit
Test 1
Test 2
Test 3
Test 4
Number of DPCHo
81)
2
2
0
dB
-101)
-10
-10
0
Ioc
dBm/1.28MHz
-60
Information Data Rate
Kbps
12.2
64
144
384
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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5.4.2.1.2 Rationale
|
The simulation will be carried out with ten codes and each has the same power (-10dB/code). The number of interfering signals are 8. That means that the number of own codes are 2 or other way round the relation between the number of own codes divided by the whole number of codes is 2/10 or –7dB. That is the correction factor for the Test1. The other test cases above and throughout the following subclauses can be explained on the same way.
Table 5.23: Performance requirements in AWGN channel.
Test Number
[dB]
BLER
1
3.1
10-2
2
2.1
10-1
2.4
10-2
3
2.5
10-1
2.8
10-2
4
2.8
10-1
3.0
10-2
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25.945
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5.4.3 Demodulation of DCH in multipath fading conditions
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25.945
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5.4.3.1 Multipath fading Case 1
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The performance requirement of DCH is determined by the maximum Block Error Ratio (BLER). The BLER is specified for each individual data rate of the DCH. DCH is mapped into the Dedicated Physical Channel (DPCH).
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
5.4.3.1.1 Minimum requirement
|
For the parameters specified in Table 5.24 the BLER should not exceed the piece-wise linear BLER curve specified in Table 5.25.
Table 5.24: DCH parameters in multipath Case 1 channel
Parameters
Unit
Test 1
Test 2
Test 3
Test 4
Number of DPCHo
8
2
2
0
DB
-10
-10
-10
0
Ioc
dBm/1.28MHz
-60
Information Data Rate
Kbps
12.2
64
144
384
Table 5.25: Performance requirements in multipath Case 1 channel.
Test Number
[dB]
BLER
1
22.2
10-2
2
15.0
10-1
22.0
10-2
3
16.0
10-1
23.0
10-2
4
16.0
10-1
23.0
10-2
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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5.4.3.2 Multipath fading Case 2
|
The performance requirement of DCH is determined by the maximum Block Error Ratio (BLER). The BLER is specified for each individual data rate of the DCH. DCH is mapped into the Dedicated Physical Channel (DPCH).
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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5.4.3.2.1 Minimum requirement
|
For the parameters specified in Table 5.26 the BLER should not exceed the piece-wise linear BLER curve specified in Table 5.27.
Table 5.26: DCH parameters in multipath Case 2 channel
Parameters
Unit
Test 1
Test 2
Test 3
Test 4
Number of DPCHo
8
2
2
0
dB
-10
-10
-10
0
Ioc
dBm/1.28MHz
-60
Information Data Rate
Kbps
12.2
64
144
384
Table 5.27: Performance requirements in multipath Case 2 channel.
Test Number
[dB]
BLER
1
13.2
10-2
2
9.5
10-1
13.7
10-2
3
10.0
10-1
14.0
10-2
4
10.0
10-1
14.0
10-2
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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5.4.3.3 Multipath fading Case 3
|
The performance requirement of DCH is determined by the maximum Block Error Ratio (BLER). The BLER is specified for each individual data rate of the DCH. DCH is mapped into the Dedicated Physical Channel (DPCH).
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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5.4.3.3.1 Minimum requirement
|
For the parameters specified in Table 5.28 the BLER should not exceed the piece-wise linear BLER curve specified in Table 5.29.
Table 5.28: DCH parameters in multipath Case 3 channel
Parameters
Unit
Test 1
Test 2
Test 3
Test 4
Number of DPCHo
8
2
2
0
dB
-10
-10
-10
0
Ioc
dBm/1.28MHz
-60
Information Data Rate
Kbps
12.2
64
144
384
Table 5.29: Performance requirements in multipath Case 3 channel.
Test Number
[dB]
BLER
1
10.8
10-2
2
8.3
10-1
11.1
10-2
13.8
10-3
3
8.7
10-1
10.6
10-2
11.8
10-3
4
8.8
10-1
10.3
10-2
11.5
10-3
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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5.4.3.4 Explanation difference
|
The different performance requirement is result from different propagation condition (Annex D), different service mapping (Annex C.2) ,different simulation assumption and different chip rate with 3.84 Mcps chip rate TDD.
The BCH test case, is testing the block STTD capability of the terminal. Block STTD is currently not supported by 1.28 Mcps chip rate TDD, as specified in TR 25.928. Therefore this test case is not needed for 1.28 Mcps chip rate TDD.
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6 BS radio transmission and reception
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25.945
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6.1 Frequency bands and channel arrangement
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25.945
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6.1.1 General
|
The information presented in this section is based on a chip rate of 1.28 Mcps.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.2 Frequency bands
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.3 TX–RX frequency separation
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25.945
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6.1.3.1 Description
|
No TX-RX frequency separation is required as Time Division Duplex (TDD) is employed. Each subframe of 1.28 Mcps TDD consists of 7 main timeslots (TS0 ~ TS6) where TS0 (before DL to UL switching point) are always allocated DL, the timeslots (at least the first one) before the switching point (vice versa) are allocated UL and the timeslots after the switching point (vice versa) are allocated DL.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.3.2 Explanation of difference
|
The frame structure for 3.84 Mcps TDD and 1.28 Mcps TDD is different. For 3.84 Mcps TDD, each TDMA frame consists of 15 timeslots where each timeslot can be allocated to either transmit or receive.
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.4 Channel arrangement
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.4.1 Channel spacing
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25.945
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6.1.4.1.1 Background
|
The chip rate is 1.28 Mcps with a roll-off factor of 0.22, therefore the occupied bandwidth is 1.6MHz.
It is just nominal for 1.6MHz, and it is also flexible to adjust the channel raster step 200kHz to narrow as 1.4MHz for strict requirement situations if needed.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.4.1.2 Channel spacing
|
The channel spacing for 1.28 Mcps chip rate option is 1.6MHz.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.4.2 Channel raster
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.1.4.3 Channel number
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2 Transmitter characteristics
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.1 General
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.2 Base station output power
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.2.1 Base station maximum output power
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.2.1.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.3 Frequency stability
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4 Output power dynamics
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.1 Inner loop power control
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.2 Power control steps
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.2.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.3 Power control dynamic range
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.3.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.4 Minimum transmit power
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.4.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.4.5 Primary CCPCH power
|
Common with 3.84 Mcps TDD option.
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.5 Transmit ON/OFF power
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.5.1 Transmit OFF power
|
The transmit OFF power state is when the BS does not transmit. This parameter is defined as maximum output transmit power within the channel bandwidth when the transmitter is OFF.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.5.1.1 Minimum Requirement
|
The requirement of transmitOFF power shall be better than –82 dBm measured with a filter that has a Root Raised Cosine (RRC) filter response with a roll off =0.22 and a bandwidth equal to the chip rate.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.5.1.2 Rationale
|
Assuming the Noise Figure(NF) of BS is 7dB and Minimum Couple Loss(MCL) is 30dB. For the victim receiver, the Tx OFF power should not exceed the thermal noise. If Tx OFF power is 6dB below thermal noise, it will introduce 1dB degradation. The proposal for Tx OFF power is as follows:
NOTE: In 1.28 Mcps TDD option, The noise figure of BS is assumed to be 7dB, it is based on that this parameter has been approved by CWTS yet and it is easier for implementation of BS.
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.5.2 Transmit ON/OFF Time mask
|
The time mask transmit ON/OFF defines the ramping time allowed for the BS between transmit OFF power and transmit ON power.
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.5.2.1 Minimum Requirement
|
The transmit power level versus time should meet the mask specified in below figure.
Figure 6.1
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6 Output RF spectrum emissions
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6.1 Occupied bandwidth
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6.1.1 Description
|
Occupied bandwidth is a measure of the bandwidth containing 99% of the total integrated power for transmitted spectrum and is centered on the assigned channel frequency. The occupied channel bandwidth is about 1.6 MHz based on a chip rate of 1.28 Mcps.
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6.1.2 Explanation of difference
|
In 3.84 Mcps TDD, the occupied channel bandwidth is less than 5MHz based on 3.84 Mcps.
But in 1.28 Mcps TDD, as the background analysis in WG4#12 Meeting Tdoc515, which has been accepted to into the TR25.945, the occupied channel bandwidth should be less than 1.6 MHz based on 1.28 Mcps.
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6.2 Out of band emission
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6.2.1 Spectrum emission mask
|
The mask defined in Tables 6.1 to 6.4 below may be mandatory in certain regions. In other regions this mask may not be applied.
Figure 6.2
Table 6.1: Spectrum emission mask values, BS maximum output power P 43 dBm
Frequency offset of measurement filter –3dB point, f
Frequency offset of measurement filter centre frequency, f_offset
Maximum level
Measurement bandwidth
0.8 f < 1.0 MHz
0.815MHz f_offset < 1.015MHz
-14 dBm
30 kHz
1.0 f < 1.8 MHz
1.015MHz f_offset < 1.815MHz
- 14 - 15(f_offset – 1.015) dBm
30 kHz
See note
1.815MHz f_offset < 2.3MHz
-28 dBm
30 kHz
1.8 f MHz
2.3MHz f_offset < f_offsetmax
-13 dBm
1 MHz
Table 6.2: Spectrum emission mask values, BS maximum output power 39 P < 43 dBm
Frequency offset of measurement filter –3dB point, f
Frequency offset of measurement filter centre frequency, f_offset
Maximum level
Measurement bandwidth
0.8 f < 1.0 MHz
0.815MHz f_offset < 1.015MHz
-14 dBm
30 kHz
1.0 f < 1.8 MHz
1.015MHz f_offset < 1.815MHz
-14 - 15(f_offset – 1.015) dBm
30 kHz
1.8 f < 2.4 MHz
1.815MHz f_offset < 2.415MHz
-28 dBm
30 kHz
See note
2.415MHz f_offset < 2.9MHz
P-71 dBm
30 kHz
2.4 f MHz
2.9MHz f_offset < f_offsetmax
P - 56 dBm
1 MHz
Table 6.3: Spectrum emission mask values, BS maximum output power 31 P < 39 dBm
Frequency offset of measurement filter –3dB point,f
Frequency offset of measurement filter centre frequency, f_offset
Maximum level
Measurement bandwidth
0.8 f < 1.0 MHz
0.815MHz f_offset < 1.015MHz
P - 53 dBm
30 kHz
1.0 f < 1.8 MHz
1.015MHz f_offset < 1.815MHz
P - 53 - 15(f_offset – 1.015) dBm
30 kHz
1.8 f < 2.4 MHz
1.815MHz f_offset < 2.415MHz
P - 67 dBm
30 kHz
See note
2.415MHz f_offset < 2.9MHz
P - 71 dBm
30 kHz
2.4 f MHz
2.9MHz f_offset < f_offsetmax
P - 56 dBm
1 MHz
Table 6.4: Spectrum emission mask values, BS maximum output power P < 31 dBm
Frequency offset of measurement filter –3dB point, f
Frequency offset of measurement filter centre frequency, f_offset
Maximum level
Measurement bandwidth
0.8 f < 1.0 MHz
0.815MHz f_offset < 1.015MHz
-22 dBm
30 kHz
1.0 f < 1.8 MHz
1.015MHz f_offset < 1.815MHz
-22 - 15(f_offset – 1.015) dBm
30 kHz
1.8 f < 2.4 MHz
1.815MHz f_offset < 2.415MHz
-36 dBm
30 kHz
See note
2.415MHz f_offset < 2.9MHz
-40 dBm
30 kHz
2.4 f MHz
2.9MHz f_offset < f_offsetmax
-25 dBm
1 MHz
f_offsetmax is either 4.0 MHz or the offset to the UMTS Tx band edge as defined in section 6.1.2 of TR25.945 whichever is the greater.
NOTE: This frequency range ensures that the range of values of f_offset is continuous.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.6.2.2 Explanation
| |
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.6.2.2.1 Frequency offset
|
Because the nominal bandwidth of 1.28 Mcps TDD option, the spectrum mask definition starts at 0.8MHz offset.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.6.2.2.2 Measurement bandwidth
|
“-26dB modulation bandwidth” of 1.28 Mcps TDD option is smaller than that of 3.84 Mcps TDD option, so a higher emission is allowed. However, in accordance with the 3.84 Mcps TDD option, the same level and measurement bandwidth are used.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.6.2.2.3 Mask shape
|
For the flat region from 0.8MHz to 1.0MHz, it gives sufficient margin to cope with the unwanted spectral response due to baseband modulation, and allows to provide additional protection for the second narrow-band channel in case of narrow-band services (using 200kHz channel raster). In addition, the slope from 1.0MHz to 1.8MHz is for reflecting more accurately PA behaviour and providing further guarantee on levels in adjacent bandwidth.
6.2.6.2A Adjacent Channel Leakage power Ratio(ACLR)
6.2.6.2A.1 Minimum requirement
For the 1.28 Mcps chip rate option, the ACLR shall be better than the value specified in the following Table.
Table 6.5: BS ACLR (1.28 Mcps chip rate)
BS adjacent channel offset
ACLR limit
± 1.6 MHz
40 dB
± 3.2 MHz
50 dB
NOTE: This requirement is valid for co-existence with frame and switching point synchronized systems, or for non-synchronized systems if the path loss between the BSs is greater than 107dB.
6.2.6.2A.2 Requirement in case of operation in proximity to TDD BS or FDD BS operating on an adjacent frequency
In case the equipment is operated in proximity to another TDD BS or FDD BS and both BSs operating on an adjacent frequency band , the requirement is specified in terms of power level of the transmitting BS. This requirement is valid for co-existence with non-frame and non-switching point synchronised systems operating on the closest used carrier. The interference power level shall not exceed the limit in Table 6.6.
Table 6.6: BS ACLR in case of operation in proximity
Center Frequency for Measurement
Maximum Level of the interference power
(in case of multiple antennas the interference powers shall be summed at all antenna connectors)
Measurement Bandwidth
Closest used carrier of the victim receiver:
Either FDD carrier
Or 3.84 Mcps TDD carrier
Or 1.28 Mcps TDD carrier
-36 dBm
chip rate of the victim receiver:
In case of FDD: 3.84 MHz
In case of 3.84 Mcps TDD: 3.84 MHz
In case of 1.28 Mcps TDD: 1.28 MHz
The closest used carrier with respect to the regarded carrier of one system is defined by:
A minimum difference in centre frequency between the regarded carrier and the carriers used in the other system and the chip rate of the other system.
If the actual allowed interference level Pint, allowed, actual at the victim receiver is higher than –106dBm, this requirement may be relaxed by the amount Pint, allowed, actual – (-106dBm).
6.2.6.2A.3 Requirement in case of co-siting with TDD BS or FDD BS operating on an adjacent frequency
In case the equipment is co-sited to another TDD BS or FDD BS and both BSs operating on an adjacent frequency band, the requirement is specified in terms of power level of the transmitting BS. This requirement is valid for co-existence with a non-frame and non-switching point synchronised systems operating on closest used carrier. The interference power level shall not exceed the limit in Table 6.7.
Table 6.7: BS ACLR in case of co-siting
Center Frequency for Measurement
Maximum Level of the interference power
(in case of multiple antennas the interference powers shall be summed at all antenna connectors)
Measurement Bandwidth
Closest used carrier of the victim receiver:
Either FDD carrier
Or 3.84 Mcps TDD arrier
Or 1.28 Mcps TDD arrier
-76 dBm
Chip rate of victim receiver:
In case of FDD: 3.84 MHz
In case of 3.84 Mcps TDD: 3.84 MHz
In case of 1.28 Mcps TDD: 1.28 MHz
The closest used carrier with respect to the regarded carrier of one system is defined by:
A minimum difference in centre frequency between the regarded carrier and the carriers used in the other system and the chip rate of the other system.
If the actual MCLactual is higher than 30dB, this requirement may be relaxed by the amount MCLactual – 30dB.
If the actual allowed interference level Pint, allowed, actual at the victim receiver is higher than –106dBm, this requirement may be relaxed by the amount Pint, allowed, actual – (-106dBm).
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1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6.3 Spurious emissions
|
Common with 3.84 Mcps option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
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6.2.6.3.1 Mandatory Requirements
|
The requirements of either subclause 6.2.6.3.1.1 or subclause 6.2.6.3.1.2 shall apply whatever the type of transmitter considered (single carrier or multi-carrier). It applies for all transmission modes foreseen by the manufacturer’s.
Either requirement applies at frequencies within the specified frequency ranges which are more than 4MHz under the first carrier frequency used or more than 4 MHz above the last carrier frequency used.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.6.3.1.0 Explanation of difference
|
In 3.84 Mcps option, the frequency offset from carrier frequency is greater than 12.5MHz, while in 1.28 Mcps option it is greater than 4 MHz.
In ITU specification, the frequency limit between out of band emissions and spurious emissions is defined as 250% of the necessary bandwidth. In 1.28 Mcps option the necessary bandwidth is 1.6MHz, so the frequency offset from carrier frequency is:
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.6.3.1.1 Spurious emissions (Category A)
|
Common with 3.84 Mcps option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
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25.945
|
6.2.6.3.1.2 Spurious emissions (Category B)
|
The following requirements shall be met in cases where Category B limits for spurious emissions, as defined in ITU-R Recommendation SM.329 [16], are applied.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.1.2.1 Minimum Requirement
|
The power of any spurious emission shall not exceed:
Table 6.8 BS Mandatory spurious emissions limits, Category B
Band
Maximum Level
Measurement Bandwidth
Note
9kHz – 150kHz
- 36 dBm
1 kHz
Note 1
150kHz – 30MHz
- 36 dBm
10 kHz
Note 1
30MHz – 1GHz
- 36 dBm
100 kHz
Note 1
1GHz
Fc1 – 19.2 MHz or Fl - 3.2 MHz
whichever is the higher
- 30 dBm
1 MHz
Note 1
Fc1 - 19.2 MHz or Fl - 3.2MHz
whichever is the higher
Fc1 - 16 MHz or Fl - 3.2 MHz
whichever is the higher
- 25 dBm
1 MHz
Note 2
Fc1 - 16 MHz or Fl - 3.2 MHz
whichever is the higher
Fc2 + 16 MHz or Fu + 3.2 MHz
whichever is the lower
- 15 dBm
1 MHz
Note 2
Fc2 + 16 MHz or Fu + 3.2 MHz
whichever is the lower
Fc2 + 19.2MHz or Fu + 3.2MHz
whichever is the lower
- 25 dBm
1 MHz
Note 2
Fc2 + 19.2 MHz or Fu + 3.2 MHz
whichever is the lower
12,5 GHz
- 30 dBm
1 MHz
Note 3
NOTE 1: Bandwidth as in ITU-R SM.329 [16], s4.1
NOTE 2: Specification in accordance with ITU-R SM.329 [16], s4.3 and Annex 7
NOTE 3: Bandwidth as in ITU-R SM.329 [16], s4.3 and Annex 7. Upper frequency as in ITU-R SM.329 [1], s2.5 table 1
Fc1: Center frequency of emission of the first carrier transmitted by the BS
Fc2: Center frequency of emission of the last carrier transmitted by the BS
Fl: Lower frequency of the band in which TDD operates
Fu: Upper frequency of the band in which TDD operates
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.2 Co-existence with GSM 900
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.2.1 Operation in the same geographic area
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.2.1.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.2.2 Co-located base stations
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.2.2.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.3 Co-existence with DCS 1800
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.3.1 Operation in the same geographic area
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.3.1.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.3.2 Co-located base stations
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.3.2.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.4 Co-existence with UTRA FDD
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.4.1 Operation in the same geographic area
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.4.1.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.4.2 Co-located base stations
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.6.3.4.2.1 Minimum requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.7 Transmit intermodulation
|
The transmit intermodulation performance is a measure of the capability of the transmitter to inhibit the generation of signals in its non linear elements caused by presence of the wanted signal and an interfering signal reaching the transmitter via the antenna.
The transmit intermodulation level is the power of the intermodulation products when a CDMA modulated interference signal is injected into the antenna connector at a level of 30 dB lower than that of the subject signal. The frequency of the interference signal shall be 1.6 MHz, 3.2 MHz and 4.8 MHz offset from the subject signal.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.7.0 Explanation of difference
|
In 1.28 Mcps option, the necessary bandwidth is 1.6MHz. The frequency of interference signal is 1*NB,2*NB and 3*NB offset from the subject, that means 1.6 MHz, 3.2 MHz and 4.8 MHz.
In 3.84 Mcps option, the necessary bandwidth is 5 MHz. So the frequency of interference signal is 5 MHz, 10 MHz and 15 MHz offset from subject signal.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.7.1 Minimum requirement
|
The Transmit intermodulation level shall not exceed the out of band or the spurious emission requirements of section 6.2.6.2 and 6.2.6.3 in TR25.945.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8 Transmit modulation
| |
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8.1 Transmit pulse shape filter
|
The transmit pulse-shaping filter is a root-raised cosine (RRC) with roll-off =0.22 in the frequency domain. The impulse response of the chip impulse filter RC0(t) is
Where the roll-off factor =0.22 and the chip duration:
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8.1.1 Explanation of difference
|
The chip rate for 1.28 Mcps TDD option is 1.28 Mcps, the chip duration is
.
While in 3.84 Mcps TDD option, the chip rate is 3.84 Mcps, the duration is
.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8.2 Modulation Accuracy
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8.2.1 Minimum Requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8.3 Peak Code Domain Error
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8.3.1 Minimum Requirement
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.2.8.3.2 Rationale
|
For 3.84 Mcps TDD and FDD, the minimum requirements for the error vector magnitude and peak code domain error ensures that
- the error vector magnitude does not degrade the performance
- the error vector magnitude leads only to low increase for the transmitted output power to remain the Eb/N0
The theoretical investigations have shown that the error vector magnitude is related to the spreading factor. Because the same spreading factors are used for 1.28 Mcps TDD and for 3.84 Mcps TDD, the same minimum requirement applies.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3 Receiver characteristics
| |
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.1 General
|
Common with 3.84 Mcps TDD option.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.2 Reference sensitivity level
|
The reference sensitivity is the minimum receiver input power measured at the antenna connector at which the FER/BER does not exceed the specific value indicated in section 6.3.2.1.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.2.1 Minimum Requirement
|
For the measurement channel specified in the Annex C, the reference sensitivity level and performance of the BS shall be as specified in table 6.9 below.
Table 6.9: BS reference sensitivity levels
Data rate
BS reference sensitivity level (dBm)
FER/BER
12.2 kbps
-110 dBm
BER shall not exceed 0.001
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.2.2 Rationale
|
The reference sensitivity value of BS for 1.28 Mcps TDD is derived from the following formula. Assuming the noise figure(NF) of BS is 7dB, the noise floor is:
According to the simulation results for 12.2Kbps measurement channel, the BER=0.001 is achieved at Îor/Ioc = 1.2dB with an own code power of 1/5 of the whole transmit code power (-7dB). In simulation, assume Îor equal to Ior, we can get:
The sensitivity value without implementation is calculated as follows:
If the implementation margin is considered to be 1.5dB, the final sensitivity value is:
The reference sensitivity value of –110dBm is proposed to the BS specification for 1.28 Mcps TDD .
NOTE: In 1.28 Mcps TDD option, The noise figure of BS is assumed to be 7dB, it is based on that this parameter has been approved by CWTS yet and it is easier for implementation of BS.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.2.3 Simulation results
|
The simulation is done to 12.2kb/s data in static propagation condition for BS of 1.28 Mcps TDD. The service-mapping is specified in Annex C, and the simulation assumption is specified in section 9.
Figure 6.3
Table 6.10
Îor/Ioc
Pb
-0.49
5.09E-2
-0.03
2.12E-2
0.41
8.11E-3
0.82
2.90E-3
1.25
8.12E-4
1.68
1.23E-4
1.95
2.61E-5
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.2.4 Maximum Frequency Deviation for Receiver Performance
|
The need for such a requirement is for further study.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.3 Dynamic range
|
Receiver dynamic range is the receiver ability to handle a rise of interference in the reception frequency channel. The receiver shall fulfil a specified BER requirement for a specified sensitivity degradation of the wanted signal in the presence of an interfering AWGN signal in the same reception frequency channel.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.3.1 Minimum requirement
|
The BER shall not exceed 0.001 for the parameters specified in Table 6.11.
Table 6.11: Dynamic Range
Parameter
Level
Unit
Data rate
12.2
kbps
Wanted signal
<REFSENS> + 30 dB
dBm
Interfering AWGN signal
-76dBm
dBm/1.28 MHz
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.3.2 Rationale
|
When wanted signal level is 30 dB above the reference sensitivity level, in order to keep the performance of BER0.001 the maximum interfering signal PI needs meet the following requirement:
It is also proposed to the BS conformance test, the section 8.4.3 this report.
NOTE: In 1.28 Mcps TDD option, The noise figure of BS is assumed to be 7dB, it is based on that this parameter has been approved by CWTS yet and it is easier for implementation of BS.
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.4 Adjacent Channel Selectivity (ACS)
|
Adjacent channel selectivity (ACS) is a measure of the receiver ability to receive a wanted signal at its assigned channel frequency in the presence of an adjacent channel signal at a given frequency offset from the center frequency of the assigned channel.ACS is the ratio of the receiver filter attenuation on the assigned channel frequency to the receive filter attenuation on the adjacent channel(s).
|
1cc4b09fd057c9a5cf925fb9b5a5f4e7
|
25.945
|
6.3.4.1 Minimum Requirement
|
The BER shall not exceed 0.001 for the parameters specified in table 6.12.
Table 6.12: Adjacent channel selectivity
Parameter
Level
Unit
Data rate
12.2
kbps
Wanted signal
Reference sensitivity level + 6dB
dBm
Interfering signal
–55
dBm
Fuw (Modulated)
1.6
MHz
|
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