5.1a.9 Packet data block type 20 (UBS-6)
3GPP45.003GSM/EDGE Channel codingRelease 17TS
5.1a.9.1 Block constitution
If the message delivered to the encoder does not include a PAN, it has a fixed size of 623 information bits {d(0),d(1),…,d(622)}. If the message delivered to the encoder includes a PAN, it has a fixed size of 648 information bits {d(0),d(1),…,d(647).
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,…,28
i(k-29) = d(k) for k = 29,…,622
And if a PAN is included:
pn(k-623) = d(k) for k = 622,…,647
5.1a.9.2 Header coding
The header coding is the same as for UBS-5 as specified in subclause 5.1a.8.2.
5.1a.9.3 Data coding
The data, {i(0),…,i(593)}, is coded as defined in subclause 5.1a.1.2, with N=594, resulting in a coded block of 1836 bits, {C(0),…,C(1835)}.
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 in such a way that the following coded bits are punctured:
Always punctured |
Punctured only if a PAN is included |
|
P1 |
C(15*k+j) for k=0,…,121, j=2, 4, 8, 9, 11, 12 and 13; and C(15*122+j) for j=2 and 4, except C(15*k+9) for k=9, 24, 39, 54, 69, 84, 99 and 114 that are not punctured |
C(15*k+9) for k=9, 24, 39, 54, 69, 84, 99 and 114; and C(15*k+5) for k=0, 1, 3, 5, 6, 8, 10, 11, 13, 15, 17, 18, 20, 22, 23, 25, 27, 28, 30, 32, 34, 35, 37, 39, 40, 42, 44, 45, 47, 49, 51, 52, 54, 56, 57, 59, 61, 62, 64, 66, 68, 69, 71, 73, 74, 76, 78, 79, 81, 83, 85, 86, 88, 90, 91, 93, 95, 96, 98, 100, 102, 103, 105, 107, 108, 110, 112, 113, 115, 117, 119 and 120 |
P2 |
C(15*k+j) for k=0,…,121, j=0, 1, 3, 6, 7, 10 and 14; and C(15*122+j) for j=0, 1 and 3, except C(15*k+1) for k=2, 17, 32, 47, 62, 77, 92, 107 and 122 that are not punctured |
C(15*k+1) for k=2, 17, 32, 47, 62, 77, 92, 107 and 122; and C(15*k+13) for k=0, 2, 4, 5, 7, 9, 11, 12, 14, 16, 17, 19, 21, 22, 24, 26, 28, 29, 31, 33, 34, 36, 38, 39, 41, 43, 45, 46, 48, 50, 51, 53, 55, 56, 58, 60, 62, 63, 65, 67, 68, 70, 72, 73, 75, 77, 79, 80, 82, 84, 85, 87, 89, 90, 92, 94, 96, 97, 99, 101, 102, 104, 106, 107, 109, 111, 113, 114, 116, 118 and 119 |
If a PAN is not included, the result is a block of 988 bits, {c(0),…,c(987)}.
If a PAN is included, the result is a block of 908 bits, {c(0),…,c(907)}.
5.1a.9.4 PAN coding
The PAN coding is the same as for UBS-5 as specified in subclause 5.1a.8.4.
5.1a.9.5 Interleaving
The interleaving is the same as for UBS-5 as specified in subclause 5.1a.8.5.
5.1a.9.6 Mapping on a burst
The mapping is the same as for UBS-5 as specified in subclause 5.1a.8.6.