B.2.1 Example 1

04.603GPPGeneral Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 1999TS

Figure B.8 shows the first 2 RLC blocks of a TBF (Down-link). Only the last segment of a LLC PDU requires a length indicator.

1st RLC Block

LLC PDU

Bit

8

7

6

5

4

3

2

1

FBI=0

E = 0

Length indicator = 11

E = 0

Octet 1

Length indicator = 26

E = 1

Octet 2

Octet 3

LLC PDU 1 (cont)

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.

.

LLC PDU 1

1st PDU of the TBF

Octet 13

Octet 14

Octet 15

LLC PDU 2

.

.

.

LLC PDU 2

Octet 39

Octet 40

Octet 41

LLC PDU 3

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.

.

LLC PDU 3

Octet N2

2nd RLC block of the TBF

Bit

8

7

6

5

4

3

2

1

FBI=0

E = 0

Length indicator = 11

E = 0

Octet 1

LLC PDU 3

Length indicator = 26

E = 1

Octet 2

Octet 3

LLC PDU 3 (cont)

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.

.

Octet 13

Octet 14

Octet 15

LLC PDU 4

.

.

.

LLC PDU 4

Octet 39

Octet 40

Octet 41

LLC PDU 5

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.

.

LLC PDU 5

Octet N2-1

Octet N2

Figure B.8: Example for the case when a LLC PDU stretches over more than 2 consecutive in sequence RLC data blocks (LLC PDU 3 and LLC PDU 5)