5.1a.25 Packet data block type 36 (DBS-6)

3GPP45.003GSM/EDGE Channel codingRelease 17TS

5.1a.25.1 Block constitution

If the message delivered to the encoder does not include a PAN, it has a fixed size of 624 information bits {d(0),d(1),…,d(623)}. If the message delivered to the encoder includes a PAN, it has a fixed size of 649 information bits {d(0),d(1),…,d(648).

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,…,29

i(k-30) = d(k) for k = 30,…,623

And if a PAN is included:

pn(k-624) = d(k) for k = 624,…,648

5.1a.25.2 USF coding

The USF coding is the same as for DBS-5 as specified in subclause 5.1a.24.2.

5.1a.25.3 Header coding

The header coding is the same as for DBS-5 as specified in subclause 5.1a.24.3.

5.1a.25.4 Data coding

The data part, {i(0),…,i(593)}, is coded as defined in subclause 5.1a.1.3, with N=594, resulting in a coded block of 1830 bits, {C(0),…,C(1829)}.

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

The parameter values used for rate matching are: swap=0.15, =610,=956 and =876.

P1 puncturing is generated according to 5.1a.1.3.5

P2 (Type 1) puncturing is generated according to 5.1a.1.3.5.

If a PAN is not included, the result is a block of 956 bits, {c(0),…,c(955)}.

If a PAN is included, the result is a block of 876 bits, {c(0),…,c(875)}.

5.1a.25.5 PAN coding

The PAN coding is the same as for UBS-5 as specified in subclause 5.1a.8.4.

5.1a.25.6 Interleaving

The interleaving is the same as for DBS-5 as specified in subclause 5.1a.24.6.

5.1a.25.7 Mapping on a burst

The mapping is the same as for DBS-5 as specified in subclause 5.1a.24.7.