5.1a.20 Packet data block type 31 (DAS-9)

3GPP45.003GSM/EDGE Channel codingRelease 17TS

5.1a.20.1 Block constitution

If the message delivered to the encoder does not include a PAN, it has a fixed size of 1133 information bits {d(0),d(1),…,d(1132)}. If the message delivered to the encoder does not include a PAN but includes an eTFI, it has a fixed size of 1136 information bits {d(0),d(1),…,d(1135). If the message delivered to the encoder includes a PAN but does not include an eTFI, it has a fixed size of 1158 information bits {d(0),d(1),…,d(1157). If the message delivered to the encoder includes a PAN and an eTFI, it has a fixed size of 1161 information bits {d(0),d(1),…,d(1160).

NOTE: The presence of the PAN is indicated by the PANI field in the header (see 3GPP TS 44.060).

The message is separated into the following parts:

u(k) = d(k) for k = 0,…,2

h(k-3) = d(k) for k = 3,…,40

i1(k-41) = d(k) for k = 41,…,586

i2(k-587) = d(k) for k = 587,…,1132

And if an eTFI is included:

et(k-1133) = d(k) for k = 1133,…,1135

And if a PAN is included:

pn(k-1133) = d(k) for k = 1133,…,1157

And if a PAN and an eTFI are included:

et(k-1158) = d(k) for k = 1158,…,1160

5.1a.20.2 USF coding

The USF coding is the same as for DAS-8 as specified in subclause 5.1a.19.2.

5.1a.20.3 Header coding

The header coding is the same as for DAS-8 as specified in subclause 5.1a.19.3.

5.1a.20.4 Data coding

Each data part, {i1(0),…,i1(545)} and {i2(0),…,i2(545)}, is coded as defined in subclause 5.1a.1.3, with N=546, resulting in two coded blocks of 1686 bits, {C1(0),…,C1(1685)} and {C2(0),…,C2(1685)}.

Each coded block is punctured depending on the value of the CPS field as defined in 3GPP TS 44.060. Three puncturing schemes named P1, P2 or P3 are applied.

The parameter values used for rate matching are: swap=0, =562,=832 and =793.

P1 puncturing is generated according to 5.1a.1.3.5

P2 (Type 2) puncturing is generated according to 5.1a.1.3.5.

P3 puncturing is generated according to 5.1a.1.3.5.

If a PAN is not included, the result is two blocks of 832 bits, {c1(0),…,c1(831)} and {c2(0),…,c2(831)}.

If a PAN is included, the result is two blocks of 793 bits, {c1(0),…,c1(792)} and {c2(0),…,c2(792)}.

NOTE: C1 and c1 correspond to i1, and C2 and c2 to i2.

5.1a.20.5 PAN coding

The PAN coding is the same as for UAS-7 as specified in subclause 5.1a.3.4.

5.1a.20.6 Interleaving

The interleaving is the same as for DAS-8 as specified in subclause 5.1a.19.6.

5.1a.20.7 Mapping on a burst

The mapping is the same as for DAS-8 as specified in subclause 5.1a.19.7.