5.1a.11 Packet data block type 22 (UBS-8)

3GPP45.003GSM/EDGE Channel codingRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

5.1a.11.1 Block constitution

If the message delivered to the encoder does not include a PAN, it has a fixed size of 1228 information bits {d(0),d(1),…,d(1227)}. If the message delivered to the encoder includes a PAN, it has a fixed size of 1253 information bits {d(0),d(1),…,d(1252).

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:

h(k) = d(k) for k = 0,…,39

i1(k-40) = d(k) for k = 40,…,633

i2(k-634) = d(k) for k = 634,…,1227

And if a PAN is included:

pn(k-1228) = d(k) for k = 1228,…,1252

5.1a.11.2 Header coding

The header coding is the same as for UBS-7 as specified in subclause 5.1a.10.2.

5.1a.11.3 Data coding

Each data part, {i1(0),…,i1(593)} and {i2(0),…,i2(593)}, is coded as defined in subclause 5.1a.1.2, with N=594, resulting in two coded blocks of 1836 bits, {C1(0),…,C1(1835)} and {C2(0),…,C2(1835)}.

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 in such a way that the following coded bits are punctured:

Always punctured

Punctured only if a PAN is included

C(18*k+j) for k=0,…,101, j=2, 4, 8, 9, 10, 14, 16 and 17,

except C(18*k+17) for k=4, 17, 30, 43, 56, 69, 82 and 95 that are not punctured

C(18*k+17) for k=4, 17, 30, 43, 56, 69, 82 and 95; and

C(18*k+3) for k=0, 3, 6, 9, 12, 15, 19, 22, 25, 28, 31, 35, 38, 41, 44, 47, 51, 54, 57, 60, 63, 66, 70, 73, 76, 79, 82, 86, 89, 92, 95 and 98

C(18*k+j) for k=0,…,101, j=0, 1, 5, 6, 7, 11, 12 and 13,

except C(18*k+7) for k=8, 21, 34, 47, 60, 73, 86 and 99 that are not punctured

C(18*k+7) for k=8, 21, 34, 47, 60, 73, 86 and 99; and

C(18*k+15) for k=1, 4, 7, 11, 14, 17, 20, 23, 27, 30, 33, 36, 39, 43, 46, 49, 52, 55, 58, 62, 65, 68, 71, 74, 78, 81, 84, 87, 90, 94, 97 and 100

If a PAN is not included, the result is two blocks of 1028 bits, {c1(0),…,c1(1027)} and {c2(0),…,c2(1027)}.

If a PAN is included, the result is two blocks of 988 bits, {c1(0),…,c1(987)} and {c2(0),…,c2(987)}.

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

5.1a.11.4 PAN coding

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

5.1a.11.5 Interleaving

The interleaving is the same as for UBS-7 as specified in subclause 5.1a.10.5.

5.1a.11.6 Mapping on a burst

The mapping is the same as for UBS-7 as specified in subclause 5.1a.10.6.