4.2 Spreading
25.2133GPPRelease 17Spreading and modulation (FDD)TS
4.2.1 Dedicated physical channels
The possible combinations of the maximum number of respective dedicated physical channels which may be configured simultaneously for a UE in addition to the DPCCH are specified in table 0. The actual UE capability may be lower than the values specified in table 0; the actual dedicated physical channel configuration is indicated by higher layer signalling. The actual number of configured DPDCHs, denoted Nmax‑dpdch, is equal to the largest number of DPDCHs from all the TFCs in the TFCS. Nmax‑dpdch is not changed by frame-by-frame TFCI change or temporary TFC restrictions.
Table 0: Maximum number of simultaneously-configured uplink dedicated channels
|
DPDCH |
HS-DPCCH |
E-DPDCH |
E-DPCCH |
S-E-DPDCH |
S-E-DPCCH |
|
|
Case 1 |
6 |
1 |
– |
– |
– |
– |
|
Case 2 |
1 |
1 |
2 |
1 |
– |
– |
|
Case 3 |
– |
1 on the primary uplink frequency, 0 on any secondary uplink frequency |
4 per uplink frequency |
1 per uplink frequency |
– |
– |
|
Case 4 |
1 |
2 |
2 |
1 |
– |
– |
|
Case 5 |
– |
2 on the primary uplink frequency, 0 on any secondary uplink frequency |
4 per uplink frequency |
1 per uplink frequency |
– |
– |
|
Case 6 |
– |
2 |
4 |
1 |
4 |
1 |
|
Case X |
1 on the primary uplink frequency |
2 on the primary uplink frequency, 0 on any secondary uplink frequency |
2 on the primary uplink frequency, 4 on the secondary uplink frequency |
1 per uplink frequency |
– |
– |
Figure 1 illustrates the principle of the spreading of uplink dedicated physical channels (DPCCH, DPDCHs, HS-DPCCH, DPCCH2, E-DPCCH, E-DPDCHs, S-E-DPCCH). Figure 1.1 illustrates the principle of the spreading of uplink S-DPCCH and S-E-DPDCHs.
In case of BPSK modulation , the binary input sequences of all physical channels are converted to real valued sequences, i.e. the binary value "0" is mapped to the real value +1, the binary value "1" is mapped to the real value –1, and the value "DTX" (HS-DPCCH only) is mapped to the real value 0.
In case of 4PAM modulation, the binary input sequences of all E-DPDCH and S-E-DPDCH physical channels are converted to real valued sequences, i.e. a set of two consecutive binary symbols nk, nk+1 (with k mod 2 = 0) in each binary sequence is converted to a real valued sequence following the mapping described in Table 0A.
In case of 8PAM modulation, the binary input sequences of all E-DPDCH and S-E-DPDCH physical channels are converted to real valued sequences, i.e. a set of three consecutive binary symbols nk, nk+1, nk+2 (with k mod 3 = 0) in each binary sequence is converted to a real valued sequence following the mapping described in Table 0B.
Table 0A: Mapping of E-DPDCH and S-E-DPDCH
with 4PAM modulation
|
nk, nk+1 |
Mapped real value |
|
00 |
0.4472 |
|
01 |
1.3416 |
|
10 |
-0.4472 |
|
11 |
-1.3416 |
Table 0B: Mapping of E-DPDCH and S-E-DPDCH
with 8PAM modulation
|
nk, nk+1, nk+2 |
Mapped real value |
|
000 |
0.6547 |
|
001 |
0.2182 |
|
010 |
1.0911 |
|
011 |
1.5275 |
|
100 |
-0.6547 |
|
101 |
-0.2182 |
|
110 |
-1.0911 |
|
111 |
-1.5275 |
Figure 1: Spreading for uplink dedicated channels
Figure 1.1: Spreading for uplink S-DPCCH and S-E-DPDCHs
The spreading operation is specified in subclauses 4.2.1.1 to 4.2.1.4 for each of the dedicated physical channels; it includes a spreading stage, a weighting stage, and an IQ mapping stage. In the process, the streams of real-valued chips on the I and Q branches are summed; this results in a complex-valued stream of chips for each set of channels.
As described in figure 1, the resulting complex-valued streams Sdpch, Sdpcch2, Shs-dpcch, Se-dpch and Ss-e-dpcch are summed into a single complex-valued stream which is then scrambled by the complex-valued scrambling code Sdpch,n resulting in the complex-valued signal S. As described in Figure 1.1, the resulting complex-valued streams Ss-dpcch and Ss-e-dpdch are summed into a single complex-valued stream which is scrambled by the same complex-valued scrambling code Sdpch,n resulting in the complex-valued signal S’. The scrambling code shall be applied aligned with the radio frames, i.e. the first scrambling chip corresponds to the beginning of a radio frame.
NOTE: Although subclause 4.2.1 has been reorganized in this release, the spreading operation for the DPCCH, DPDCH remains unchanged as compared to the previous release.
4.2.1.1 DPCCH/DPDCH
Figure 1a illustrates the spreading operation for the uplink DPCCH and DPDCHs.
Figure 1A: Spreading for uplink DPCCH/DPDCHs
The DPCCH is spread to the chip rate by the channelisation code cc. The n:th DPDCH called DPDCHn is spread to the chip rate by the channelisation code cd,n.
After channelisation, the real-valued spread signals are weighted by gain factors, c for DPCCH, d for all DPDCHs.
The c and d values are signalled by higher layers or derived as described in [6] 5.1.2.5 and 5.1.2.5C. At every instant in time, at least one of the values c and d has the amplitude 1.0. The c and d values are quantized into 4 bit words. The quantization steps are given in table 1.
Table 1: The quantization of the gain parameters
|
Signalled values for c and d |
Quantized amplitude ratios c and d |
|
15 |
1.0 |
|
14 |
14/15 |
|
13 |
13/15 |
|
12 |
12/15 |
|
11 |
11/15 |
|
10 |
10/15 |
|
9 |
9/15 |
|
8 |
8/15 |
|
7 |
7/15 |
|
6 |
6/15 |
|
5 |
5/15 |
|
4 |
4/15 |
|
3 |
3/15 |
|
2 |
2/15 |
|
1 |
1/15 |
|
0 |
Switch off |
4.2.1.2 HS-DPCCH
Figure 1B illustrates the spreading operation for the HS-DPCCH when Secondary_Cell_Enabled is less than 4 in case the UE is not configured in MIMO mode with four transmit antennas in any cell, or less than 2 in case the UE is configured in MIMO mode with four transmit antennas in at least one cell. Figure 1B.1 illustrates the spreading operation for the HS-DPCCHs when Secondary_Cell_Enabled is greater than 3 in case the UE is not configured in MIMO mode with four transmit antennas in any cell, or greater than 1 in case the UE is configured in MIMO mode with four transmit antennas in at least one cell..
Figure 1B: Spreading for uplink HS-DPCCH when Secondary_Cell_Enabled is less than 4 in case the UE is not configured in MIMO mode with four transmit antennas in any cell, or less than 2 in case the UE is configured in MIMO mode with four transmit antennas in at least one cell
Figure 1B.1: Spreading for uplink HS-DPCCHs when Secondary_Cell_Enabled is greater than 3 in case the UE is not configured in MIMO mode with four transmit antennas in any cell, or greater than 1 in case the UE is configured in MIMO mode with four transmit antennas in at least one cell
Each HS-DPCCH shall be spread to the chip rate by the channelisation code chs.
After channelisation, the real-valued spread signals are weighted by gain factor hs
The hs values are derived from the quantized amplitude ratios Ahs which are translated from ACK , ACK and CQI signalled by higher layers as described in [6] 5.1.2.5A.
The translation of ACK, ACK and CQI into quantized amplitude ratios Ahs =hs/c in the case that DPCCH2 is not configured, and Ahs =hs/c2 in the case that DPCCH2 is configured is shown in Table 1A.
Table 1A: The quantization of the power offset
|
Signalled values for ACK, ACK and CQI |
Quantized amplitude ratios Ahs =hs/c or hs/c2 |
|
12 |
76/15 |
|
11 |
60/15 |
|
10 |
48/15 |
|
9 |
38/15 |
|
8 |
30/15 |
|
7 |
24/15 |
|
6 |
19/15 |
|
5 |
15/15 |
|
4 |
12/15 |
|
3 |
9/15 |
|
2 |
8/15 |
|
1 |
6/15 |
|
0 |
5/15 |
If Secondary_Cell_Enabled is less than 4 in case the UE is not configured in MIMO mode with four transmit antennas in any cell, or less than 2 in case the UE is configured in MIMO mode with four transmit antennas in at least one cell, HS-DPCCH shall be mapped to the I branch in case Nmax-dpdch is 2, 4 or 6, and to the Q branch otherwise (Nmax-dpdch = 0, 1, 3 or 5). If Secondary_Cell_Enabled is greater than 3 in case the UE is not configured in MIMO mode with four transmit antennas in any cell, or greater than 1 in case the UE is configured in MIMO mode with four transmit antennas in at least one cell, HS-DPCCH shall be mapped to the Q branch and HS-DPCCH2 shall be mapped to the I branch.
4.2.1.3 E-DPDCH/E-DPCCH
Figure 1C illustrates the spreading operation for the E-DPDCHs and the E-DPCCH.
Figure 1C: Spreading for E-DPDCH/E-DPCCH
The E-DPCCH shall be spread to the chip rate by the channelisation code cec. The k:th E-DPDCH, denominated E‑DPDCHk, shall be spread to the chip rate using channelisation code ced,k.
After channelisation, the real-valued spread E-DPCCH and E-DPDCHk signals shall respectively be weighted by gain factor ec and ed,k.
E-TFCIec,boost may be signalled by higher layers. If E-TFCIec,boost is not signalled by higher layers a default value 127 shall be used. When UL_MIMO_Enabled is TRUE the UE shall assume E-TFCIec,boost = -1 for rank-2 transmissions.
When E-TFCI ≤ E-TFCIec,boost the value of ec shall be derived as specified in [6] based on the quantized amplitude ratio Aec which is translated from E-DPCCH signalled by higher layers. The translation of E-DPCCH into quantized amplitude ratios Aec =ec/c is specified in Table 1B.
Table 1B: Quantization for E-DPCCH for E-TFCI ≤ E-TFCIec,boost
|
Signalled values for E-DPCCH |
Quantized amplitude ratios Aec =ec/c |
|
15 |
151/15 |
|
14 |
120/15 |
|
13 |
95/15 |
|
12 |
76/15 |
|
11 |
60/15 |
|
10 |
48/15 |
|
9 |
38/15 |
|
8 |
30/15 |
|
7 |
24/15 |
|
6 |
19/15 |
|
5 |
15/15 |
|
4 |
12/15 |
|
3 |
9/15 |
|
2 |
8/15 |
|
1 |
6/15 |
|
0 |
5/15 |
When E-TFCI > E-TFCIec,boost in order to provide an enhanced phase referencethe value of ec shall be derived as specified in [6] based on a traffic to total pilot power offset T2TP, configured by higher layers as specified in Table 1B.0 and the quantization of the ratio ec/c as specified in Table 1B.0A.
Table 1B.0: T2TP
|
Signalled values for |
Power offset values |
|
6 |
16 |
|
5 |
15 |
|
4 |
14 |
|
3 |
13 |
|
2 |
12 |
|
1 |
11 |
|
0 |
10 |
Table 1B.0A: Quantization for ec/c for E-TFCI > E-TFCIec,boost
|
Quantized amplitude ratios ec/c |
E-DPDCH modulation schemes which may be used in the same subframe |
|
239/15 |
4PAM, 8PAM |
|
190/15 |
4PAM, 8PAM |
|
151/15 |
4PAM, 8PAM |
|
120/15 |
BPSK, 4PAM, 8PAM |
|
95/15 |
BPSK, 4PAM, 8PAM |
|
76/15 |
BPSK, 4PAM, 8PAM |
|
60/15 |
BPSK, 4PAM, 8PAM |
|
48/15 |
BPSK, 4PAM, 8PAM |
|
38/15 |
BPSK, 4PAM, 8PAM |
|
30/15 |
BPSK, 4PAM, 8PAM |
|
24/15 |
BPSK, 4PAM, 8PAM |
|
19/15 |
BPSK, 4PAM, 8PAM |
|
15/15 |
BPSK, 4PAM, 8PAM |
|
12/15 |
BPSK, 4PAM, 8PAM |
|
9/15 |
BPSK |
|
8/15 |
BPSK, 4PAM, 8PAM |
|
6/15 |
BPSK, 4PAM, 8PAM |
|
5/15 |
BPSK |
The value of ed,k shall be computed as specified in [6] subclause 5.1.2.5B.2, based on the reference gain factors, the spreading factor for E-DPDCHk, the HARQ offsets, and the quantization of the ratio ed,k/c into amplitude ratios specified in Table 1B.2 for the case when E-TFCI ≤ E-TFCIec,boost and Table 1.B.2B, for the case when E-TFCI > E-TFCIec,boost.
The reference gain factors are derived from the quantised amplitude ratios Aed which is translated from E-DPDCH signalled by higher layers. The translation of E-DPDCH into quantized amplitude ratios Aed =ed/c is specified in Table 1B.1 for the case when E-TFCI ≤ E-TFCIec,boost and Table 1.B.2A for the case when E-TFCI > E-TFCIec,boost.
When the UE is configured in MIMO mode and transmitting two transport blocks, one with a set of E-DPDCHs and another with a set of S-E-DPDCHs, the amplitude ratios Aed for the primary stream are modified to take the inter-stream interference into account. Note that the amplitude ratios for the secondary stream are not modified. The amplitude ratios Aed for the primary stream are then given by
Aed = Aed, ISI x AISI
Aed,ISI, is translated from ∆E-DPDCH signalled by higher layers. The translation of ∆E-DPDCH into quantized amplitude ratios Aed,ISI is specified in Table 1B.2A. AISI is an inter-stream interference compensation factor that is translated from ∆ISI signalled by higher layers according to Table 1B.0B. Note that this procedure does not affect the power used for the transmission of the primary stream E-TFC, but rather lowers the size of the primary stream transport block in order to compensate for the inter-stream interference.
Table 1B.0B: Quantization of ΔISI
|
Signalled values for ISI |
Quantized amplitude ratios ISI |
|
15 |
30/15 |
|
14 |
29/15 |
|
13 |
28/15 |
|
12 |
27/15 |
|
11 |
26/15 |
|
10 |
25/15 |
|
9 |
24/15 |
|
8 |
23/15 |
|
7 |
22/15 |
|
6 |
21/15 |
|
5 |
20/15 |
|
4 |
19/15 |
|
3 |
18/15 |
|
2 |
17/15 |
|
1 |
16/15 |
|
0 |
15/15 |
Table 1B.1: Quantization for E-DPDCH for E-TFCI ≤ E-TFCIec,boost
|
Signalled values for E-DPDCH |
Quantized amplitude ratios Aed =ed/c |
E-DPDCH modulation schemes which may be used in the same subframe |
|
29 |
168/15 |
BPSK |
|
28 |
150/15 |
BPSK |
|
27 |
134/15 |
BPSK |
|
26 |
119/15 |
BPSK |
|
25 |
106/15 |
BPSK |
|
24 |
95/15 |
BPSK |
|
23 |
84/15 |
BPSK |
|
22 |
75/15 |
BPSK |
|
21 |
67/15 |
BPSK |
|
20 |
60/15 |
BPSK |
|
19 |
53/15 |
BPSK, 4PAM |
|
18 |
47/15 |
BPSK, 4PAM |
|
17 |
42/15 |
BPSK, 4PAM |
|
16 |
38/15 |
BPSK, 4PAM |
|
15 |
34/15 |
BPSK, 4PAM |
|
14 |
30/15 |
BPSK, 4PAM |
|
13 |
27/15 |
BPSK, 4PAM |
|
12 |
24/15 |
BPSK, 4PAM |
|
11 |
21/15 |
BPSK, 4PAM |
|
10 |
19/15 |
BPSK, 4PAM |
|
9 |
17/15 |
BPSK |
|
8 |
15/15 |
BPSK |
|
7 |
13/15 |
BPSK |
|
6 |
12/15 |
BPSK |
|
5 |
11/15 |
BPSK |
|
4 |
9/15 |
BPSK |
|
3 |
8/15 |
BPSK |
|
2 |
7/15 |
BPSK |
|
1 |
6/15 |
BPSK |
|
0 |
5/15 |
BPSK |
Table 1B.2: Quantization for ed,k/c for E-TFCI ≤ E-TFCIec,boost
|
Quantized amplitude ratios ed,k/c |
E-DPDCH modulation schemes which may be used in the same subframe |
|
168/15 |
BPSK |
|
150/15 |
BPSK |
|
134/15 |
BPSK |
|
119/15 |
BPSK |
|
106/15 |
BPSK |
|
95/15 |
BPSK |
|
84/15 |
BPSK |
|
75/15 |
BPSK |
|
67/15 |
BPSK |
|
60/15 |
BPSK |
|
53/15 |
BPSK, 4PAM |
|
47/15 |
BPSK, 4PAM |
|
42/15 |
BPSK, 4PAM |
|
38/15 |
BPSK, 4PAM |
|
34/15 |
BPSK, 4PAM |
|
30/15 |
BPSK, 4PAM |
|
27/15 |
BPSK, 4PAM |
|
24/15 |
BPSK, 4PAM |
|
21/15 |
BPSK, 4PAM |
|
19/15 |
BPSK, 4PAM |
|
17/15 |
BPSK |
|
15/15 |
BPSK |
|
13/15 |
BPSK |
|
12/15 |
BPSK |
|
11/15 |
BPSK |
|
9/15 |
BPSK |
|
8/15 |
BPSK |
|
7/15 |
BPSK |
|
6/15 |
BPSK |
|
5/15 |
BPSK |
Table 1B.2A: Quantization for E-DPDCH for E-TFCI > E-TFCIec,boost
|
Signalled values for E-DPDCH |
Quantized amplitude ratios Aed =ed/c |
E-DPDCH modulation schemes which may be used in the same subframe |
|
31 |
377/15 |
4PAM, 8PAM (applicable only for SF2 code in a 2xSF2+2xSF4 configuration) |
|
30 |
336/15 |
4PAM, 8PAM (applicable only for SF2 code in a 2xSF2+2xSF4 configuration) |
|
29 |
299/15 |
4PAM, 8PAM |
|
28 |
267/15 |
BPSK (applicable only for SF2 code in a 2xSF2+2xSF4 configuration), 4PAM, 8PAM |
|
27 |
237/15 |
BPSK (applicable only for SF2 code in a 2xSF2+2xSF4 configuration), 4PAM, 8PAM |
|
26 |
212/15 |
BPSK, 4PAM, 8PAM |
|
25 |
189/15 |
BPSK, 4PAM, 8PAM |
|
24 |
168/15 |
BPSK, 4PAM, 8PAM |
|
23 |
150/15 |
BPSK, 4PAM, 8PAM |
|
22 |
134/15 |
BPSK, 4PAM, 8PAM |
|
21 |
119/15 |
BPSK, 4PAM, 8PAM |
|
20 |
106/15 |
BPSK, 4PAM, 8PAM |
|
19 |
95/15 |
BPSK, 4PAM, 8PAM |
|
18 |
84/15 |
BPSK, 4PAM, 8PAM |
|
17 |
75/15 |
BPSK, 4PAM, 8PAM |
|
16 |
67/15 |
BPSK, 4PAM, 8PAM |
|
15 |
60/15 |
BPSK, 4PAM, 8PAM |
|
14 |
53/15 |
BPSK, 4PAM, 8PAM |
|
13 |
47/15 |
BPSK, 4PAM, 8PAM |
|
12 |
42/15 |
BPSK, 4PAM, 8PAM |
|
11 |
38/15 |
BPSK |
|
10 |
34/15 |
BPSK |
|
9 |
30/15 |
BPSK |
|
8 |
27/15 |
BPSK |
|
7 |
24/15 |
BPSK |
|
6 |
21/15 |
BPSK |
|
5 |
19/15 |
BPSK |
|
4 |
17/15 |
BPSK |
|
3 |
15/15 |
BPSK |
|
2 |
13/15 |
BPSK |
|
1 |
11/15 |
BPSK |
|
0 |
8/15 |
BPSK |
Table 1B.2B: Quantization for ed,k/c for E-TFCI > E-TFCIec,boost
|
Quantized amplitude ratios ed,k/c |
E-DPDCH modulation schemes which may be used in the same subframe |
|
377/15 |
4PAM, 8PAM (applicable only for SF2 code in a 2xSF2+2xSF4 configuration) |
|
336/15 |
4PAM, 8PAM (applicable only for SF2 code in a 2xSF2+2xSF4 configuration) |
|
299/15 |
4PAM, 8PAM |
|
267/15 |
BPSK (applicable only for SF2 code in a 2xSF2+2xSF4 configuration), 4PAM, 8PAM |
|
237/15 |
BPSK (applicable only for SF2 code in a 2xSF2+2xSF4 configuration), 4PAM, 8PAM |
|
212/15 |
BPSK, 4PAM, 8PAM |
|
189/15 |
BPSK, 4PAM, 8PAM |
|
168/15 |
BPSK, 4PAM, 8PAM |
|
150/15 |
BPSK, 4PAM, 8PAM |
|
134/15 |
BPSK, 4PAM, 8PAM |
|
119/15 |
BPSK, 4PAM, 8PAM |
|
106/15 |
BPSK, 4PAM, 8PAM |
|
95/15 |
BPSK, 4PAM, 8PAM |
|
84/15 |
BPSK, 4PAM, 8PAM |
|
75/15 |
BPSK, 4PAM, 8PAM |
|
67/15 |
BPSK, 4PAM, 8PAM |
|
60/15 |
BPSK, 4PAM, 8PAM |
|
53/15 |
BPSK, 4PAM, 8PAM |
|
47/15 |
BPSK, 4PAM, 8PAM |
|
42/15 |
BPSK, 4PAM, 8PAM |
|
38/15 |
BPSK |
|
34/15 |
BPSK |
|
30/15 |
BPSK |
|
27/15 |
BPSK |
|
24/15 |
BPSK |
|
21/15 |
BPSK |
|
19/15 |
BPSK |
|
17/15 |
BPSK |
|
15/15 |
BPSK |
|
13/15 |
BPSK |
|
11/15 |
BPSK |
|
8/15 |
BPSK |
The HARQ offsets harq to be used for support of different HARQ profile are configured by higher layers as specified in Table 1B.3.
Table 1B.3: HARQ offset harq
|
Signalled values for harq |
Power offset values harq [dB] |
|
6 |
6 |
|
5 |
5 |
|
4 |
4 |
|
3 |
3 |
|
2 |
2 |
|
1 |
1 |
|
0 |
0 |
After weighting, the real-valued spread signals shall be mapped to the I branch or the Q branch according to the iqec value for the E-DPCCH and to iqed,k for E-DPDCHk and summed together.
The E-DPCCH shall always be mapped to the I branch, i.e. iqec = 1.
The IQ branch mapping for the E-DPDCHs depends on Nmax-dpdch and on whether an HS-DSCH is configured for the UE; the IQ branch mapping shall be as specified in table 1C.
Table 1C: IQ branch mapping for E-DPDCH
|
Nmax-dpdch |
HS-DSCH configured |
E-DPDCHk |
iqed,k |
|
0 |
No/Yes |
E-DPDCH1 |
1 |
|
E-DPDCH2 |
j |
||
|
E-DPDCH3 |
1 |
||
|
E-DPDCH4 |
j |
||
|
1 |
No |
E-DPDCH1 |
j |
|
E-DPDCH2 |
1 |
||
|
1 |
Yes |
E-DPDCH1 |
1 |
|
E-DPDCH2 |
j |
NOTE: In case the UE transmits more than 2 E-DPDCHs, the UE then always transmits E‑DPDCH3 and E‑DPDCH4 simultaneously.
4.2.1.4 S-DPCCH
Figure 1D illustrates the spreading operation for the uplink S-DPCCH.
Figure 1D: Spreading for uplink S-DPCCH
The S-DPCCH is spread to the chip rate by the channelisation code csc.
After channelisation, the real-valued spread signal is weighted by the gain factor sc for S-DPCCH.
4.2.1.4.1 S-DPCCH gain factor setting while not transmitting rank-2
When no transmission on E-DCH is taking place, or when E-DCH transmission is taking place and E-TFCI ≤ E-TFCIec,boost the sc shall be derived based on the quantized amplitude ratios Asc which is translated from S-DPCCH signalled by higher layers as described in [6] subclause 5.1.2.5D. The translation of S-DPCCH into quantized amplitude ratios Asc =sc/c is specified in Table 1C.1.
Table 1C.1: The quantization for S-DPCCH when no transmission on E-DCH is taking place, and when E-DCH transmission is taking place and E-TFCI ≤ E-TFCIec,boost
|
Signalled values for S-DPCCH |
Quantized amplitude ratios sc |
|
6 |
1.0 |
|
5 |
12/15 |
|
4 |
11/15 |
|
3 |
10/15 |
|
2 |
9/15 |
|
1 |
8/15 |
|
0 |
Switch off |
When E-TFCI > E-TFCIec,boost in order to provide an enhanced phase reference the value of sc shall be derived as specified in [6] based on the traffic to secondary pilot power offset T2SP, configured by higher layers, and following the definition of T2TP as specified in Table 1B.0 and the quantization of the ratio sc/c following the quantization of ec/c as specified in Table 1B.0A.
4.2.1.4.2 S-DPCCH gain factor setting while transmitting rank-2
When a set of S-E-DPDCHs are present in a TTI, the S-DPCCH gain factor sc is set equal to ec for that TTI as defined in sub-clause 4.2.1.3.
4.2.1.5 S-E-DPCCH
Figure 1E illustrates the spreading operation for the S-E-DPCCH.
Figure 1E: Spreading for S-E-DPCCH
The S-E-DPCCH shall be spread to the chip rate by the channelisation code csec.
After channelisation, the real-valued spread S-E-DPCCH shall be weighted by gain factor sec.
The S-E-DPCCHvalue is signalled by higher layers and the gain factor sec shall be derived based on the quantized amplitude ratios. The translation of S-E-DPCCHinto quantized amplitude ratios sec/c is specified in Table 1C.2.
The S-E-DPCCH shall always be mapped to the Q branch.
Table 1C.2: Quantization gain factors for S-E-DPCCH
|
Signaled values for S-E-DPCCH |
Quantized amplitude ratios βsec/βc |
|
17 |
239/15 |
|
16 |
190/15 |
|
15 |
151/15 |
|
14 |
120/15 |
|
13 |
95/15 |
|
12 |
76/15 |
|
11 |
60/15 |
|
10 |
48/15 |
|
9 |
38/15 |
|
8 |
30/15 |
|
7 |
24/15 |
|
6 |
19/15 |
|
5 |
15/15 |
|
4 |
12/15 |
|
3 |
9/15 |
|
2 |
8/15 |
|
1 |
6/15 |
|
0 |
5/15 |
4.2.1.6 S-E-DPDCH
Figure 1F illustrates the spreading operation for the S-E-DPDCHs.
Figure 1F: Spreading for S-E-DPDCH
The k:th S-E-DPDCH, denominated S-E‑DPDCHk, shall be spread to the chip rate using channelisation code csed,k.
After channelisation, the real-valued spread S-E-DPDCHk signals shall respectively be weighted by gain factor sed,k. The value of sed,k for S-E-DPDCHk shall follow that of the corresponding ed,k for E-DPDCHk transmitted in the same TTI as defined in table 1C.3.
Table 1C.3: Gain factor setting for S-E-DPDCHs
|
S-E-DPDCHk |
Quantized amplitude ratios sed,k/c |
|
S-E-DPDCH1 |
sed,1/c = ed,1/c |
|
S-E-DPDCH2 |
sed,2/c = ed,2/c |
|
S-E-DPDCH3 |
sed,3/c = ed,3/c |
|
S-E-DPDCH4 |
sed,4/c = ed,4/c |
NOTE: Either no S-E-DPDCHs are transmitted, or all four S-E-DPDCHs are transmitted together and simultaneously with four E-DPDCHs.
After weighting, the real-valued spread signals shall be mapped to the I branch or the Q branch according to the iqsed,k for S-E-DPDCHk and summed together. The IQ branch mapping for the S-E-DPDCHs shall be as specified in table 1C.4.
Table 1C.4: IQ branch mapping for S-E-DPDCHs
|
S-E-DPDCHk |
iqsed,k |
|
S-E-DPDCH1 |
1 |
|
S-E-DPDCH2 |
j |
|
S-E-DPDCH3 |
1 |
|
S-E-DPDCH4 |
j |
4.2.1.7 DPCCH2
Figure 1G illustrates the spreading operation for the uplink DPCCH2.
Figure 1G: Spreading for uplink DPCCH2
The DPCCH2 is spread to the chip rate by the channelisation code cc2.
After channelisation, the real-valued spread signal is weighted by the gain factor c2 for DPCCH2.
At every instant in time, the value of c2 is set to 1.0.
4.2.2 PRACH
4.2.2.1 PRACH preamble part
The PRACH preamble part consists of a complex-valued code, described in subclause 4.3.3.
4.2.2.2 PRACH message part
Figure 2 illustrates the principle of the spreading and scrambling of the PRACH message part, consisting of data and control parts. The binary control and data parts to be spread are represented by real-valued sequences, i.e. the binary value "0" is mapped to the real value +1, while the binary value "1" is mapped to the real value –1. The control part is spread to the chip rate by the channelisation code cc, while the data part is spread to the chip rate by the channelisation code cd.
Figure 2: Spreading of PRACH message part
After channelisation, the real-valued spread signals are weighted by gain factors, c for the control part andd for the data part. At every instant in time, at least one of the values c and d has the amplitude 1.0. The -values are quantized into 4 bit words. The quantization steps are given in subclause 4.2.1.
After the weighting, the stream of real-valued chips on the I- and Q-branches are treated as a complex-valued stream of chips. This complex-valued signal is then scrambled by the complex-valued scrambling code Sr-msg,n. The 10 ms scrambling code is applied aligned with the 10 ms message part radio frames, i.e. the first scrambling chip corresponds to the beginning of a message part radio frame.
4.2.3 Void
4.2.4 Channel combining for UL CLTD and UL MIMO
Figure 3, 3A, and 3B illustrate how different uplink channels are combined if UL_CLTD_Enabled is TRUE.
– For the case that UL_CLTD_Active is 1,
– Each complex-valued spread channel, corresponding to point S in Figure 1, and point S’ in Figure 1.1 , shall be separately pre-coded by a precoding vector {w1,w2} and {w3,w4} as described in [6]. After precoding, the complex-valued signals T and T’ are obtained; see Figure 3.
– For the case that UL_CLTD_Active is 2,
– Complex-valued spread channel, corresponding to point S in Figure 1, shall be mapped to T, as shown in Figure 3A.
– For the case that UL_CLTD_Active is 3,
– Complex-valued spread channel, corresponding to point S in Figure 1, shall be mapped to T’, as shown in Figure 3B.
Figure 3: Combining of uplink physical channels when UL_CLTD_Enabled is TRUE and UL_CLTD_Active is 1
Figure 3A: Combining of uplink physical channels when UL_CLTD_Enabled is TRUE and UL_CLTD_Active is 2
Figure 3B: Combining of uplink physical channels when UL_CLTD_Enabled is TRUE and UL_CLTD_Active is 3