WCDMA3G UpLkAllocDPCH

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WCDMA3G_UpLkAllocDPCH

Description: Determine spread factor and number of phyCHs in uplink
Library: 3GPPFDD 10-99, Spreading & Modulation
Class: SDFWCDMA3G_UpLkAllocDPCH

Parameters

Name	Description	Default	Sym	Type	Range
TrCHNum	number of transport channels to be rate matched into one CCTrCH	1	N	int	[1, ∞)
TrCHType	dedicated channel type: Dedicated Channel, Dedicated Measurement Channel	Dedicated Channel		enum
RM	semi-static rate matching attribute for all transport channels	1		real array	[0, ∞)
PL	maximum ratio of puncturing that can be applied in uplink	0		real	[0, 1)

Pin Inputs

Pin	Name	Description	Signal Type
1	TFMax	maximum TF of each transport channel	int

Pin Outputs

Pin	Name	Description	Signal Type
2	DPCHNum	number of dedicated physical channels allocated in uplink	int
3	DPCHSF	spreading factor of dedicated physical channels allocated in uplink	int

Notes/Equations

This model is used to determine the spreading factor and number of physical channels used in an uplink.
Each firing, one token of DPCHNum and one token of DPCHSF are produced when N tokens of TFMax are consumed.
Model functions
Notations are as follows:
N_i,j number of bits in a radio frame before rate matching on TrCH i with transport format combination j.
RM_i semi-static rate matching attribute for transport channel i. Signalled from higher layers.
PL puncturing limit for uplink. This value limits the amount of puncturing that can be applied in order to avoid multiple codes or to enable the use of a higher spreading factor. Signalled from higher layers.
N_data,j total number of bits that are available for the CCTrCH in a radio frame with transport format combination j.
Function UpLkAllocDPDCH( ) is used to allocate the number of Dedicated Physical Data Channels (DPDCHs) and their SF values used in Uplink. In uplink puncturing can be used to avoid multicode or to enable the use of a higher spreading factor when this is needed because the UE does not support SF down to 4. The numbers of available bits in the radio frames for all possible spreading factors are denoted by N₂₅₆, N₁₂₈, N₆₄, N₃₂, N₁₆, N₈ and N₄, where the index refers to the spreading factor. The possible values of N_data,j then are {N₂₅₆, N₁₂₈, N₆₄, N₃₂, N₁₆, N₈, N₄, 2N₄, 3N₄, 4N₄, 5N₄, 6N₄}, where the linear coefficient refers to the number of DPDCH. From N_data,j, the number and SF values of DPDCHs, which are stored in the parameters SF and Num, can be determined. RM_i and N_ij value of each transport channel (TrCH) are saved in the input arrays RMP and NP respectively. The number of TrCHs is TrCHNum.
UpLkAllocDPDCH (TrCHNum, RMP, NP, SF, Num)

// according to the UE capabilities

in SET0 such that is non negative}
if SET1 is not empty and the smallest element of SET1 requires just one PhyCH
then
else
in SET0 such that
is non negative}
sort SET2 in ascending order

do while ( N_data is not the max of SET2 and the follower of N_data requires no additional PhyCH)
pf N_data in SET2
end do

endif
SF and Num can be gotten from N_data,j.