12.5 EGPRS

3GPP44.060General Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 17TS

12.5.1 EGPRS Channel Quality Report

The EGPRS Channel Quality Report Information Element IE is defined in tables 12.5.1.1 and 12.5.1.2. The information to be included within this IE depends on the setting of the ES/P field or CES/P field (see sub-clause 9.1.8.2.1) and on the most recently received LINK_QUALITY_MEASUREMENT_MODE field (see sub-clause 11.2.7).

Table 12.5.1.1 : EGPRS Channel Quality Report Information elements

< EGPRS Channel Quality Report IE> ::=

< EGPRS BEP Link Quality Measurements : < EGPRS BEP Link Quality Measurements IE>>

< C_VALUE : bit (6) >

< EGPRS Timeslot Link Quality Measurements : <EGPRS Timeslot Link Quality Measurements IE >> ;

Table 12.5.1.2 : EGPRS Channel Quality Report Information Elements details

EGPRS BEP Link Quality Measurements IE
This information element is defined in sub-clause 12.5.3.

EGPRS Timeslot Link Quality Measurements

This information element is defined in sub-clause 12.5.4.

C_VALUE (6 bits)
This field contains the value of the C parameter calculated by the mobile station (see 3GPP TS 45.008). This field is encoded as the binary representation of the C value parameter value defined in 3GPP TS 45.008.
Range 0 to 63

12.5.2 EGPRS Window Size

This information element defines the window size to be used in an EGPRS TBF. The network sets the window size according to the number of timeslots assigned in the direction of the TBF.

If RLC acknowledged mode is signalled in the assignment/reconfiguration message, or if RLC unacknowledged mode is signalled and the mobile station does not support RLC non-persistent mode, the window size is defined according to Table 12.5.2.1 below.

Table 12.5.2.1: EGPRS Window Size Information Elements details for RLC (un)acknowledged mode

bit
5 4 3 2 1

Value of EGPRS window size

Comment

0 0 0 0 0

64

0 0 0 0 1

96

0 0 0 1 0

128

0 0 0 1 1

160

0 0 1 0 0

192

(maximum window size for a 1 timeslot TBF)

0 0 1 0 1

224

0 0 1 1 0

256

(maximum window size for a 2 timeslot TBF)

0 0 1 1 1

288

0 1 0 0 0

320

0 1 0 0 1

352

0 1 0 1 0

384

(maximum window size for a 3 timeslot TBF)

0 1 0 1 1

416

0 1 1 0 0

448

0 1 1 0 1

480

0 1 1 1 0

512

(maximum window size for a 4 timeslot TBF)

0 1 1 1 1

544

1 0 0 0 0

576

1 0 0 0 1

608

1 0 0 1 0

640

(maximum window size for a 5 timeslot TBF)

1 0 0 1 1

672

1 0 1 0 0

704

1 0 1 0 1

736

1 0 1 1 0

768

(maximum window size for a 6 timeslot TBF)

1 0 1 1 1

800

1 1 0 0 0

832

1 1 0 0 1

864

1 1 0 1 0

896

(maximum window size for a 7 timeslot TBF)

1 1 0 1 1

928

1 1 1 0 0

960

1 1 1 0 1

992

1 1 1 1 0

1024

(maximum window size for an 8-16 timeslot TBF)

1 1 1 1 1

Reserved

If RLC unacknowledged mode is signalled in the assignment/reconfiguration message, and the mobile station supports RLC non-persistent mode, RLC non-persistent mode shall be assumed by the mobile station, except when the window size is set equal to 1, and the window size is defined according to Table 12.5.2.2 below.

When a mobile station supporting RLC non-persistent mode operates in RLC unacknowledged mode (i.e. the window size is set to 1) it shall assume the maximum window size corresponding to the TBF’s timeslot allocation (see Table 9.1.9.2.1) when defining the bitmap in sub-clause 9.1.8.2.

If an MBMS bearer is allocated RLC non-persistent mode shall be used. For this case the window size is defined according to Table 12.5.2.2 below.

Table 12.5.2.2: EGPRS Window Size Information Elements details for RLC non-persistent mode

bit
5 4 3 2 1

Value of EGPRS window size

Comment

0 0 0 0 0

1

This value indicates RLC unacknowledged mode is used for the EGPRS TBF

0 0 0 0 1

2

0 0 0 1 0

4

0 0 0 1 1

6

0 0 1 0 0

8

0 0 1 0 1

10

0 0 1 1 0

12

0 0 1 1 1

16

0 1 0 0 0

20

0 1 0 0 1

24

0 1 0 1 0

32

0 1 0 1 1

40

0 1 1 0 0

48

0 1 1 0 1

56

0 1 1 1 0

64

0 1 1 1 1

80

1 0 0 0 0

96

1 0 0 0 1

112

1 0 0 1 0

128

1 0 0 1 1

160

1 0 1 0 0

192

(maximum window size for a 1 timeslot TBF)

1 0 1 0 1

256

(maximum window size for a 2 timeslot TBF)

1 0 1 1 0

320

1 0 1 1 1

384

(maximum window size for a 3 timeslot TBF)

1 1 0 0 0

448

1 1 0 0 1

512

(maximum window size for a 4 timeslot TBF)

1 1 0 1 0

576

1 1 0 1 1

640

(maximum window size for a 5 timeslot TBF)

1 1 1 0 0

768

(maximum window size for a 6 timeslot TBF)

1 1 1 0 1

896

(maximum window size for a 7 timeslot TBF)

1 1 1 1 0

1024

(maximum window size for a 8-16 timeslot TBF)

1 1 1 1 1

Reserved

12.5.3 EGPRS BEP Link Quality Measurements IE

The EGPRS BEP Link Quality measurements IE is defined in tables 12.5.3.1 and 12.5.3.2.

Table 12.5.3.1: EGPRS BEP Link Quality Information elements

<EGPRS BEP Link Quality Measurements IE> ::=

{ 0 | 1 < GMSK_MEAN_BEP : bit (5) >

< GMSK_CV_BEP : bit (3) >}

{ 0 | 1 < 8PSK_MEAN_BEP : bit (5) >

< 8PSK_CV_BEP : bit (3) > };

Table 12.5.3.2 : EGPRS BEP Link Quality Information Elements details

GMSK_MEAN_BEP (5 bit field)
This field contains the mean value of the Bit Error Probability of the channel averaged over all time slots in the TBF for GMSK, refer to 3GPP TS 45.008.

8PSK_MEAN_BEP (5 bit field)
This field contains the mean value of the Bit Error Probability of the channel averaged over all time slots in the TBF for 8 PSK, refer to 3GPP TS 45.008.

GMSK_CV_BEP (3 bit field)
This field contains the variation co-efficient for the Bit Error Probability averaged over all time slots of the TBF for GMSK, refer to 3GPP TS 45.008.

8PSK_CV_BEP (3 bit field)
This field contains the variation co-efficient for the Bit Error Probability averaged over all time slots of the TBF for 8 PSK, refer to 3GPP TS 45.008.

12.5.4 EGPRS Timeslot Link Quality Measurements IE

The EGPRS Timeslot Link Quality measurements IE is defined in tables 12.5.4.1 and 12.5.4.2.

Table 12.5.4.1: EGPRS Timeslot Link Quality Measurements Information elements

<EGPRS Timeslot Link Quality Measurements IE> ::=

{ 0 | 1< BEP_MEASUREMENTS : BEP Measurement Report Struct >}

{ 0 | 1 < INTERFERENCE_MEASUREMENTS : Interference Measurement Report Struct >};

< BEP Measurement Report Struct > ::=

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN0 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN0 : bit (4) >}}

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN1 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN1 : bit (4) >}}

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN2 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN2 : bit (4) >}}

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN3 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN3 : bit (4) >}}

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN4 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN4 : bit (4) >}}

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN5 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN5 : bit (4) >}}

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN6 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN6 : bit (4) >}}

{ 0 | 1 { 0 <GMSK_MEAN_BEP _TN7 : bit (4) >

| 1 < 8PSK_MEAN_BEP _TN7 : bit (4) >} };

< Interference Measurement Report Struct > ::=

{ 0 | 1 < I_LEVEL_TN0 : bit (4) > }

{ 0 | 1 < I_LEVEL_TN1 : bit (4) > }

{ 0 | 1 < I_LEVEL_TN2 : bit (4) > }

{ 0 | 1 < I_LEVEL_TN3 : bit (4) > }

{ 0 | 1 < I_LEVEL_TN4 : bit (4) > }

{ 0 | 1 < I_LEVEL_TN5 : bit (4) > }

{ 0 | 1 < I_LEVEL_TN6 : bit (4) > }

{ 0 | 1 < I_LEVEL_TN7 : bit (4) > };

Table 12.5.4.2: EGPRS Timeslot Link Quality Measurements Information Elements details

GMSK_MEAN_BEP_TN0 (4 bit field)
GMSK_MEAN_BEP_TN1 (4 bit field)
GMSK_MEAN_BEP_TN2 (4 bit field)
GMSK_MEAN_BEP_TN3 (4 bit field)
GMSK_MEAN_BEP_TN4 (4 bit field)
GMSK_MEAN_BEP_TN5 (4 bit field)
GMSK_MEAN_BEP_TN6 (4 bit field)
GMSK_MEAN_BEP_TN7 (4 bit field)

These fields contain the mean bit error probability value calculated on timeslots 0 through 7 for GMSK modulation, refer to 3GPP TS 45.008. These fields are transferred only when the mobile station is in packet transfer mode. In RTTI configuration, the mean bit error probability value calculated on per timeslot pair shall be reported on GMSK_MEAN_BEP_TNx where TNx is the lower numbered timeslot of each reported timeslot pair.

8PSK_MEAN_BEP_TN0 (4 bit field)
8PSK_MEAN_BEP_TN1 (4 bit field)
8PSK_MEAN_BEP_TN2 (4 bit field)
8PSK_MEAN_BEP_TN3 (4 bit field)
8PSK_MEAN_BEP_TN4 (4 bit field)
8PSK_MEAN_BEP_TN5 (4 bit field)
8PSK_MEAN_BEP_TN6 (4 bit field)
8PSK_MEAN_BEP_TN7 (4 bit field)

These fields contain the mean bit error probability value calculated on timeslots 0 through 7 for 8PSK modulation, refer to 3GPP TS 45.008. These fields are transferred only when the mobile station is in packet transfer mode. In RTTI configuration, the mean bit error probability value calculated on per timeslot pair shall be reported on 8PSK_MEAN_BEP_TNx where TNx is the lower numbered timeslot of each reported timeslot pair.

I_LEVEL_TN0 (4 bit field)

I_LEVEL_TN1 (4 bit field)

I_LEVEL_TN2 (4 bit field)

I_LEVEL_TN3 (4 bit field)

I_LEVEL_TN4 (4 bit field)

I_LEVEL_TN5 (4 bit field)

I_LEVEL_TN6 (4 bit field)

I_LEVEL_TN7 (4 bit field)

These fields contain the  value calculated on timeslots 0 through 7, respectively. The  value is defined in 3GPP TS 45.008. These fields are encoded relative to C_VALUE as defined for the mapping defined in 3GPP TS 45.008 for interference level (I_LEVEL):

bit

4 3 2 1

0 0 0 0 I_LEVEL 0

0 0 0 1 I_LEVEL 1

…

1 1 1 0 I_LEVEL 14

1 1 1 1 I_LEVEL 15

12.5.5 PDCH Pairs Description

The PDCH Pairs Description information element gives the description of the uplink and downlink corresponding pairs of an RTTI configuration.

Table 12.5.5.1: PDCH Pairs Description Information Element

< PDCH Pairs Description IE > ::=

{ 0 — Single Carrier Assignment

{ 00 — Default PDCH pair configuration

| 01 — Unchanged

| 10 — Explicit PDCH pair configuration

< DOWNLINK_PDCH_PAIRS_C1 : bit (8) >

< UPLINK_PDCH_PAIRS_C1 : bit (8) >

! < PDCH pairs configuration error : { 1 1 } bit (*) = < no string > > — reserved

}

| 1 — Dual Carrier Assignment

{ 00 — Default PDCH pair configuration

| 01 — Unchanged

| 10 — Explicit PDCH pair configuration

< DOWNLINK_PDCH_PAIRS_C1 : bit (8) >

< DOWNLINK_PDCH_PAIRS_C2 : bit (8) >

< UPLINK_PDCH_PAIRS_C1 : bit (8) >

< UPLINK_PDCH_PAIRS_C2 : bit (8) >

! < PDCH pairs configuration error : { 1 1 } bit (*) = < no string > > — reserved

}

} ;

Table 12.5.5.2: PDCH Pairs Description Information Element

DOWNLINK_PDCH_PAIRS_C1

DOWNLINK_PDCH_PAIRS_C2

UPLINK_PDCH_PAIRS_C1

UPLINK_PDCH_PAIRS_C2

These fields are defined in sub-clause 11.2.31