H.2 Example 2: "block periods" encoding

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

L = 8 (ALLOCATION_BITMAP length = 9)
z = block period relative to TBF_STARTING_TIME

ALLOCATION_BITMAP bit number indexes and block periods (BP) mapping:

n (bit

BP (z)

number index)

(block period)

0

BP (0)

1

BP (1)

2

BP (2)

3

BP (3)

4

BP (4)

5

BP (5)

6

BP (6)

7

BP (7)

8

BP (8)

ALLOCATION_BITMAP field in RLC/MAC message and block periods (BP) mapping:

bit

8

7

6

5

4

3

2

1

Octet N

BP (8)

BP (7)

BP (6)

BP (5)

Octet N+1

BP (4)

BP (3)

BP (2)

BP (1)

BP (0)

Octet N+2

Octet N+3

Figure H.2: "block periods" encoding

Annex I (informative):
EGPRS RLC Window Sizes

Although for each multislot allocation, the selected window size could preferably be the maximum, a smaller window size may be selected in order to optimize e.g. the number of (multislot) users and network memory consumption.

However, for each MS, in order to meet a performance which corresponds to the number of timeslots allocated to this MS, the selected window size shall not be smaller than a minimum window size for this particular multislot allocation.

For each network, the round-trip delay has a direct implication on the performance, hence on the definition of the minimum window sizes. Consequently, no generic minimum window sizes are suggested. However, for information, the table below lists the window size ranges recommended with a round-trip delay of about 120ms.

Window size

Coding

Timeslots allocated (Multislot capability)

1

2

3

4

5

6

7

8

64

00000

Min

96

00001

Min

128

00010

160

00011

Min

Min

192

00100

Max

224

00101

Min

256

00110

Max

288

00111

320

01000

Min

352

01001

Min

384

01010

Max

416

01011

448

01100

480

01101

512

01110

Max

Min

544

01111

576

10000

608

10001

640

10010

Max

672

10011

704

10100

736

10101

768

10110

Max

800

10111

832

11000

864

11001

896

11010

Max

928

11011

960

11100

992

11101

1024

11110

Max

Reserved

11111

x

X

x

x

x

x

x

X

Annex J (informative):
An example of MCS-8 retransmission

This example shows the radio blocks of an MCS-8 RLC data block retransmitted using MCS-6 (padding) and MCS-3 (padding).

The following hypothesis are used :

– Uplink block

– The MCS-8 RLC data block contains three LLC PDU : last part of LLC1 (last 40 octets), the whole LLC2 (length 60 octets) and the first part of LLC3 (first 34 octets)

– No TLLI nor PFI is present