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WCDMA3G TrCHDeMux

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Created by Greg Miller on Sep 10, 2008

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WCDMA3G_TrCHDeMux

Description: Transport channel de-multiplexing
Library: 3GPPFDD 10-99, Transport Channel Multiplex
Class: SDFWCDMA3G_TrCHDeMux

Parameters

Name	Description	Default	Type	Range
LinkDir	link direction: Downlink, Uplink	Downlink	enum
TrCHPosInCCTrCH	type of transport channel position in one frame of CCTrCH: Fixed, Flexible	Fixed	enum
PhyCHNum	number of physical channels that CCTrCH is mapped to	1	int	[1, ∞)
DL_PhyCHType	downlink physical channel type: DPCH_15kbps_TF0_T2_P4, DPCH_15kbps_TF2_T2_P4, DPCH_30kbps_TF0_T2_P2, DPCH_30kbps_TF2_T2_P2, DPCH_30kbps_TF0_T2_P4, DPCH_30kbps_TF2_T2_P4, DPCH_30kbps_TF0_T2_P8, DPCH_30kbps_TF2_T2_P8, DPCH_60kbps_TF0_T2_P4, DPCH_60kbps_TF2_T2_P4, DPCH_60kbps_TF0_T2_P8, DPCH_60kbps_TF2_T2_P8, DPCH_120kbps_TF8_T4_P8, DPCH_120kbps_TF0_T4_P8, DPCH_240kbps_TF8_T4_P8, DPCH_240kbps_TF0_T4_P8, DPCH_480kbps_TF8_T8_P16, DPCH_480kbps_TF0_T8_P16, DPCH_960kbps_TF8_T8_P16, DPCH_960kbps_TF0_T8_P16, DPCH_1920kbps_TF8_T8_P16, DPCH_1920kbps_TF0_T8_P16, PCCPCH	DPCH_30kbps_TF2_T2_P8	enum	†
UL_DPDCHType	uplink dedicated physical data channel type: DPDCH_15kbps, DPDCH_30kbps, DPDCH_60kbps, DPDCH_120kbps, DPDCH_240kbps, DPDCH_480kbps, DPDCH_960kbps, BCH_11_1_kbps, BCH_12_3_kbps	DPDCH_30kbps	enum
TrCHNum	number of transport channels to be multiplexed	1	int	[1, ∞)
TrCHType	dedicated channel type: Dedicated Channel, Dedicated Measurement Channel, Broadcast Channel	Dedicated Channel	enum
RM	semi-static rate matching attribute for all transport channels	1	real array
OptimisticTrCHSizes	set of transport channel frame sizes for flexible downlink transport channel positions	0	real array
† where TF n = number of transmit format indicator bits T n = number of transmit power control bits P n = number of pilot bits F n = number of feedback indicator bits

Pin Inputs

Pin	Name	Description	Signal Type
1	TFMax	maximum TF of each transport channel	int
2	in	data of one CCTrCH frame to be de-multiplexed	real
3	TFCI	received transport format combination indicator	int

Pin Outputs

Pin	Name	Description	Signal Type
4	out	data of each transport channel after de-multiplexing	multiple real
5	outSize	data size of each transport channel after de-multiplexing	multiple int

Notes/Equations

This model is used to de-multiplex radio frames of all transport channels from one coded composite transport channel (CCTrCH). It also punctures discontinuous transmission indicators with flexible transport channel positions in downlinks.
Each firing, Mp × Np tokens of each out signal and one token of each outSize signal are produced when Nt tokens of TFMax, Mp × Np tokens of in and one token of TFCI are consumed. Refer to the following table for the values of Mp.

DL_PhyCHType is valid only when LinkDir = Downlink; UL_DPDCHType is valid only when LinkDir = Uplink. When DL_PhyCHType = PCCPCH, set PhyCHNum and TrCHNum to 1.

Value of Mp

Physical Channel Type	Bits per Frame (Mp)
DL_PhyCHType
DPCH_15kbps_TF0_T2_P4	60
DPCH_15kbps_TF2_T2_P4	30
DPCH_30kbps_TF0_T2_P2	240
DPCH_30kbps_TF2_T2_P2	210
DPCH_30kbps_TF0_T2_P4	210
DPCH_30kbps_TF2_T2_P4	180
DPCH_30kbps_TF0_T2_P8	150
DPCH_30kbps_TF2_T2_P8	120
DPCH_60kbps_TF0_T2_P4	510
DPCH_60kbps_TF2_T2_P4	480
DPCH_60kbps_TF0_T2_P8	450
DPCH_60kbps_TF2_T2_P8	420
DPCH_120kbps_TF8_T4_P8	900
DPCH_120kbps_TF0_T4_P8	900
DPCH_240kbps_TF8_T4_P8	2100
DPCH_240kbps_TF0_T4_P8	2100
DPCH_480kbps_TF8_T8_P16	4320
DPCH_480kbps_TF0_T8_P16	4320
DPCH_960kbps_TF8_T8_P16	9120
DPCH_960kbps_TF0_T8_P16	9120
DPCH_1920kbps_TF8_T8_P16	18720
DPCH_1920kbps_TF0_T8_P16	18720
PCCPCH	270
UL_DPDCHType
DPDCH_15kbps	150
DPDCH_30kbps	300
DPDCH_60kbps	600
DPDCH_120kbps	1200
DPDCH_240kbps	2400
DPDCH_480kbps	4800
DPDCH_960kbps	9600

Transport Channel Data Sizes

TrCHType	TF	TTI	Downlink Data Size	Uplink Data Size
DCH_8_kbps	0	10 ms	96	312
	1	20 ms	176	276
	2	40 ms	336	258
	3	80 ms	656	252
DCH_16_kbps	4	10 ms	368	552
	5	20 ms	688	516
	6	40 ms	1344	504
	7	80 ms	2640	495
DCH_32_kbps	8	10 ms	688	1032
	9	20 ms	1344	1008
	10	40 ms	2640	990
	11	80 ms	5256	986
DCH_64_kbps	12	10 ms	1980	1980
	13	20 ms	3900	1950
	14	40 ms	7740	1935
	15	80 ms	15432	1929
DCH_128_kbps	16	10 ms	3900	3900
	17	20 ms	7740	3870
	18	40 ms	15432	3858
	19	80 ms	30807	3851
DCH_256_kbps	20	10 ms	7740	7740
	21	20 ms	15432	7716
	22	40 ms	30807	7702
	23	80 ms	61560	7695
DCH_512_kbps	24	10 ms	15432	15432
	25	20 ms	30807	15404
	26	40 ms	61560	15390
	27	80 ms	123039	15380
DMCH_2_4_kbps	2	40 ms	360	105
DMCH_12_2_kbps	5	20 ms	804	495
DMCH_64_kbps	9	20 ms	3900	2295
DMCH_144_kbps	13	20 ms	8700	4700
DMCH_384_kbps	17	20 ms	23112	9525
DMCH_2048_kbps	21	20 ms		57510
BCH_11_1_kbps	0	10 ms	270
BCH_12_3_kbps	5	20 ms	540

Model functions
This model calculates the data size of each transport channel in one frame of CCTrCH (determined in WCDMA3G_CCTrCHRMatch) and gets each transport channel data from it. The calculations used in this model are the same as, and the following notations are consistent with, WCDMA3G_CCTrCHRMatch.
Nij for uplink, number of bits in a radio frame before rate matching on transport channel i with transport format combination j; for downlink, an intermediate calculation variable.
N_il^TTI(used in downlink only) number of bits in a transmission time interval before rate matching on transport channel i with transport format l.
ΔN_ij for uplink, if positive, number of bits to be repeated in each radio frame on transport channel i with transport format combination j;
for uplink, if negative, number of bits to be punctured in each radio frame on transport channel i with transport format combination j.
for downlink, an intermediate calculation variable.
ΔN_il^TTI (used in downlink only) if positive, number of bits to be repeated in each transmission time interval on transport channel i with transport format l; if negative, number of bits to be punctured in each transmission time interval on transport channel i with transport format l.
RM_i semi-static rate matching attribute for transport channel i; signalled from higher layers.
N_data,j total number of bits available for the CCTrCH in a radio frame with transport format combination j.
Z_ij intermediate calculation variable.
F_i no. of radio frames in transmission time interval of transport channel i.
n_i radio frame number in transmission time interval of transport channel i (0 ≤ n_i ≤ Fi ).
TF_i(j) transport format of transport channel i for transport format combination j.
TFS(i) set of transport format indices l for transport channel i.
TFCS set of transport format combination indices j.
round towards +∞, that is, integer such that
round towards -∞, that is, integer such that
absolute value of x
The o notation is used to replace an index x when the indexed variable X_x does not depend on the index x. In the left wing of an assignment the meaning is that "X_o =Y" is equivalent to "for all x do X_x =Y".
- Downlink
  One CCTrCH frame size N_data,j does not depend on the transport format combination j and is equal to Mp × Np. It is denoted as N_data,*. All transport channel data in 10 ms are serially placed in one frame of CCTrCH. For flexible positions of transport channels, there may be some DTX indications at the end of one frame of CCTrCH.
- Uplink
  One CCTrCH frame size N_data,j is equal to Mp × Np. M and Np are determined by WCDMA3G_UpLkAllocDPCH. Each transport channel data after rate matching is serially placed in one frame of CCTrCH and all transport channel data fills it completely.
  From input TFCI, TF values of all N_t transport channels can be obtained. The maximum data size of each transport channel is determined by its maximum TF value from input TFMax. The previous table list TF values. RM_i is obtained from RM. After de-multiplexing, the data size of each transport channel in 10 ms is output at outSize.
Function RMatch_deltasize( ) is used to calculate the rate matching parameters deltasize Δ N_ij saved in the deltaSizeP array. There are TrCHNum (equal to Nt) transport channels which RM values are saved in the RMP array. The sizes of all transport channels N_ij are stored in the TrCHFrameSizeP array. All these transport channels will be rate matched into one frame of CCTrCH with a size of CCTrCHSize that is equal to M_p × N_p.
RMatch_deltasize (TrCHFrameSizeP, deltaSizeP, RMP, TrCHNum, CCTrCHSize)

for each
do
end for

for each
do tmpSum += RMP[i] * TrCHFrameSizeP[i]

end for
Computation of transport channel data size in downlink
One BCH is mapped to one PCCPCH. From the previous tables, one frame data size of BCH is equal to that of PCCPCH. So for BCH, there are no transport channel multiplexing and rate matching; input data is directly output.
Function DnLk_TrCHDemux( ) is used to calculate the data size of each transport channel saved in the array TrCHSizeP in downlink.The current data size of each transport channel NilTTI is based on its TF and TTI values as shown in the previous table. The maximum data size of each transport channel i for downlink is determined by its maximum TF value from input TFMax according to the previous table. is derived from function RMatch_deltasize( ).
DnLk_TrCHDemux( TFMax, N_il^TTI,TrCHSizeP)
if for fixed positions of transport channels
then // an intermediate calculation variable N_i,o, determined by TFMax and F_i
Δ N_i,o is calculated by calling function RMatch_deltasize( ) which input parameter TrCHFrameSizeP is based on N_i,o.

// For each transport channel i

else // for flexible positions of transport channels
// an intermediate calculation variable N_ij is calculated.
if the parameter OptimisticTrCHSizes is valid and used
then N_i,j, i = 1, ..., N_t, can be obtained by OptimisticTrCHSizes.
These meet the following condition: .
else // parameter OptimisticTrCHSizes is not valid and not used
N_i,j =
end if
// rate matching ratios RF_i are calculated for each transport channel i.
// tentative temporary values of Δ N_i,l^TTI for all transport channel i and any of its transport format l are calculated
// Temporary values of Δ N_i,l^TTI are checked and corrected
for all j in TFCS

if D > N_{data, o}
then for i = 1 to N_t
ΔN_i,j is calculated by calling function RMatch_deltasize( ) (parameter TrCHFrameSizeP is based on N_ij.
ΔN = F_i * ΔN_i,j
if then
end if
end for
end if
end for

// for each transport channel i

end if
Calculation of transport channel data size in uplink
N_data,j = Mp × Np; N_ij can be obtained according to the TF value of transport channel i. Using the function RMatch_deltasize( ), the data size of transport channel i is (Δ N_ij + N_ij).