5.1a.7 Packet data block type 18 (UAS-11)

3GPP45.003GSM/EDGE Channel codingRelease 17TS

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

5.1a.7.1 Block constitution

If the message delivered to the encoder does not include a PAN, it has a fixed size of 1594 information bits {d(0),d(1),…,d(1593)}. If the message delivered to the encoder includes a PAN, it has a fixed size of 1619 information bits {d(0),d(1),…,d(1618). If the message delivered to the encoder includes a PAN and an eTFI, it has a fixed size of 1622 information bits {d(0),d(1),…,d(1621).

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,…,51

i1(k-52) = d(k) for k = 52,…,565

i2(k-566) = d(k) for k = 566,…,1079

i3(k-1080) = d(k) for k = 1080,…,1593

And if a PAN is included:

pn(k-1594) = d(k) for k = 1594,…,1618

And if a PAN and an eTFI are included:

et(k-1619) = d(k) for k = 1619,…,1621

5.1a.7.2 Header coding

The header coding is the same as for UAS-10 as specified in subclause 5.1a.6.2.

5.1a.7.3 Data coding

Each data part, {i1(0),…,i1(513)}, {i2(0),…,i2(513)} and {i3(0),…,i3(513)}, is coded as defined in subclause 5.1a.1.2, with N=514, resulting in three coded blocks of 1596 bits, {C1(0),…,C1(1595)}, {C2(0),…,C2(1595)} and {C3(0),…,C3(1595)}.

Each coded block is punctured depending on the value of the CPS field as defined in 3GPP TS 44.060. Three puncturing schemes named P1, P2 or P3 are applied in such a way that the following coded bits are punctured:

	Always punctured	Punctured only if a PAN is included
P1	C(57*k+j) for k=0,…,27, j=0, 2, 3, 5, 6, 8, 9, 11, 12, 14, 15, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 39, 40, 42, 43, 45, 46, 48, 49, 51, 52, 54 and 55	C(57*k+38) for k=0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 and 26
P2	C(57*k+j) for k=0,…,27, j=1, 3, 4, 6, 7, 9, 10, 12, 13, 15, 16, 18, 20, 21, 23, 24, 26, 27, 29, 30, 32, 33, 35, 36, 38, 40, 41, 43, 44, 46, 47, 49, 50, 52, 53, 55 and 56	C(57*k+2) for k=0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26 and 27
P3	C(57*k+j) for k=0,…,27, j=0, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 21, 22, 24, 25, 27, 28, 30, 31, 33, 34, 36, 37, 39, 41, 42, 44, 45, 47, 48, 50, 51, 53, 54 and 56	C(57*k+18) for k=0, 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26 and 27

If a PAN is not included, the result is three blocks of 560 bits, {c1(0),…,c1(559)}, {c2(0),…,c2(559)} and {c3(0),…,c3(559)}.

If a PAN is included, the result is three blocks of 534 bits, {c1(0),…,c1(533)}, {c2(0),…,c2(533)} and {c3(0),…,c3(533)}.

NOTE: C1 and c1 correspond to i1, C2 and c2 to i2, and C3 and c3 to i3.

5.1a.7.4 PAN coding

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

5.1a.7.5 Interleaving

a) Header

The interleaving is the same as for UAS-10 as specified in subclause 5.1a.6.5.

b) Data and PAN

If a PAN is not included, the following definitions apply:

dc1(k) = c1(k) for k = 0,…,559

dc2(k) = c2(k) for k = 0,…,559

dc3(k) = c3(k) for k = 0,…,559

If a PAN is included, the following definitions apply:

dc1(k) = ac(3k) for k = 0,…,25

dc1(k) = c1(k-26) for k = 26,…,559

dc2(k) = ac(3k+1) for k = 0,…,25

dc2(k) = c2(k-26) for k = 26,…,559

dc3(k) = ac(3k+2) for k = 0,…,25

dc3(k) = c3(k-26) for k = 26,…,559

The three blocks {dc1(0),…,dc1(559)}, {dc2(0),…,dc2(559)} and {dc3(0),…,dc3(559)} are separately interleaved as defined in subclause 5.1a.2.2, with N_C=560 and a=359, resulting in the three blocks {di1(0),…,di1(559)}, {di2(0),…,di2(559)} and {di3(0),…,di3(559)}, where di1 corresponds to dc1, di2 to dc2 and di3 to dc3.

The blocks are put together as one entity as described by the following rule:

di(k) = di1(k) for k = 0,…,559

di(k) = di2(k-560) for k = 560,…,1119

di(k) = di3(k-1120) for k = 1120,…,1679

5.1a.7.6 Mapping on a burst

a) Straightforward mapping

The mapping is the same as for UAS-10 as specified in subclause 5.1a.6.6 a).

b) Bit swapping

The bit swapping is the same as for UAS-10 as specified in subclause 5.1a.6.6. b)

c) PAN bit swapping

In case a PAN is included in the radio block, the following additional bits are swapped after the bit swapping in b):

For B = 0

Swap e(B,15) with e(B,40)

Swap e(B,58) with e(B,81)

Swap e(B,115) with e(B,160)

Swap e(B,158) with e(B,177)

Swap e(B,187) with e(B,120)

Swap e(B,238) with e(B,280)

Swap e(B,274) with e(B,405)

Swap e(B,303) with e(B,305)

Swap e(B,346) with e(B,368)

Swap e(B,403) with e(B,444)

For B = 1

Swap e(B,11) with e(B,160)

Swap e(B,54) with e(B,177)

Swap e(B,83) with e(B,81)

Swap e(B,126) with e(B,120)

Swap e(B,155) with e(B,21)

Swap e(B,198) with e(B,0)

Swap e(B,234) with e(B,368)

Swap e(B,299) with e(B,405)

Swap e(B,342) with e(B,444)

Swap e(B,371) with e(B,280)

Swap e(B,414) with e(B,305)

Swap e(B,443) with e(B,321)

For B = 2

Swap e(B,22) with e(B,81)

Swap e(B,79) with e(B,177)

Swap e(B,151) with e(B,120)

Swap e(B,194) with e(B,160)

Swap e(B,267) with e(B,405)

Swap e(B,310) with e(B,444)

Swap e(B,339) with e(B,280)

Swap e(B,382) with e(B,305)

Swap e(B,439) with e(B,368)

For B = 3

Swap e(B,18) with e(B,177)

Swap e(B,47) with e(B,120)

Swap e(B,90) with e(B,160)

Swap e(B,119) with e(B,0)

Swap e(B,162) with e(B,40)

Swap e(B,227) with e(B,81)

Swap e(B,263) with e(B,444)

Swap e(B,335) with e(B,368)

Swap e(B,378) with e(B,405)

Swap e(B,407) with e(B,280)

Swap e(B,450) with e(B,305)