5.1a.4 Packet data block type 15 (UAS-8)

3GPP45.003GSM/EDGE Channel codingRelease 17TS

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

5.1a.4.1 Block constitution

If the message delivered to the encoder does not include a PAN, it has a fixed size of 1069 information bits {d(0),d(1),…,d(1068)}. If the message delivered to the encoder includes a PAN, it has a fixed size of 1094 information bits {d(0),d(1),…,d(1093). If the message delivered to the encoder includes a PAN and an eTFI, it has a fixed size of 1097 information bits {d(0),d(1),…,d(1096).

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,…,40

i1(k-41) = d(k) for k = 41,…,554

i2(k-555) = d(k) for k = 555,…,1068

And if a PAN is included:

pn(k-1069) = d(k) for k = 1069,…,1093

And if a PAN and an eTFI are included:

et(k-1094) = d(k) for k = 1094,…,1096

5.1a.4.2 Header coding

The header coding is the same as for UAS-7 as specified in subclause 5.1a.3.2.

5.1a.4.3 Data coding

Each data part, {i1(0),…,i1(513)} and {i2(0),…,i2(513)}, is coded as defined in subclause 5.1a.1.2, with N=514, resulting in two coded blocks of 1596 bits, {C1(0),…,C1(1595)} and {C2(0),…,C2(1595)}.

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(15*k+j) for k=0,…,105, j=2, 4, 8, 9, 11, 12 and 13; and

C(15*106+j) for j=2 and 4,
except C(15*k+9) for k=13, 40, 67 and 94 that are not punctured.

C(15*k+9) for k=13, 40, 67 and 94; and

C(15*k+5) for k=0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 76, 79, 82, 85, 88, 91, 94, 97, 100 and 103

C(15*k+j) for k=0,…,105, j=0, 1, 3, 6, 7, 10 and 14; and

C(15*106+j) for j=0,1 and 3,
except C(15*k+1) for k=8, 31, 54, 77 and 100 that are not punctured.

C(15*k+1) for k=8, 31, 54, 77 and 100; and

C(15*k+13) for k=1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 38, 41, 44, 47, 50, 53, 56, 59, 62, 65, 68, 71, 74, 77, 80, 83, 86, 89, 92, 95, 98 and 101

If a PAN is not included, the result is two blocks of 856 bits, {c1(0),…,c1(855)} and {c2(0),…,c2(855)}.

If a PAN is included, the result is two blocks of 817 bits, {c1(0),…,c1(816)} and {c2(0),…,c2(816)}.

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

5.1a.4.4 PAN coding

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

5.1a.4.5 Interleaving

The interleaving is the same as for UAS-7 as specified in subclause 5.1a.3.5.

5.1a.4.6 Mapping on a burst

The mapping is the same as for UAS-7 as specified in subclause 5.1a.3.6.