5.1a.27 Packet data block type 38 (DBS-8)

3GPP45.003GSM/EDGE Channel codingRelease 17TS

5.1a.27.1 Block constitution

If the message delivered to the encoder does not include a PAN, it has a fixed size of 1229 information bits {d(0),d(1),…,d(1228)}. If the message delivered to the encoder includes a PAN, it has a fixed size of 1254 information bits {d(0),d(1),…,d(1253).

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,…,634

i2(k-635) = d(k) for k = 635,…,1228

And if a PAN is included:

pn(k-1229) = d(k) for k = 1229,…,1253

5.1a.27.2 USF coding

The USF coding is the same as for DBS-7 as specified in subclause 5.1a.26.2.

5.1a.27.3 Header coding

The header coding is the same as for DBS-7 as specified in subclause 5.1a.26.3.

5.1a.27.4 Data coding

Each data part, {i1(0),…,i1(593)} and {i2(0),…,i2(593)}, is coded as defined in subclause 5.1a.1.3, with N=594, resulting in two coded blocks of 1830 bits, {C1(0),…,C1(1829)} and {C2(0),…,C2(1829)}.

Each 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=0.10, =610,=996 and =956.

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 two blocks of 996 bits, {c1(0),…,c1(995)} and {c2(0),…,c2(995)}.

If a PAN is included, the result is two blocks of 956 bits, {c1(0),…,c1(955)} and {c2(0),…,c2(955)}.

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

5.1a.27.5 PAN coding

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

5.1a.27.6 Interleaving

The interleaving is the same as for DBS-7 as specified in subclause 5.1a.26.6.

5.1a.27.7 Mapping on a burst

The mapping is the same as for DBS-7 as specified in subclause 5.1a.26.7.