Show Contents 

 

Introduction to CM database parameters

ncc_of_plmn_allowed

NCC of PLMN Allowed

Description

The ncc_of_plmn_allowed parameter is a bit mapped value which specifies which Network Colour Codes (NCCs) are allowed on specific broadcast control channels (BCCH carriers).

In border areas where two PLMN operators provide overlapping service, a bilateral agreement is required to determine the NCC values to be broadcast. The selected values would be specified by entering a value that would bit map to the desired NCC.

For example, PLMN operators serving a border area may agree to use NCCs of 0 and 4. A value of 17 would be entered for the ncc_of_plmn_allowed which would bit map as: 00010001

The first and fifth bits are set which allow the NCC value of 0 and 4 to be broadcast on BCCH carriers.

Two or more NCCs may be assigned in nonborder areas by specifying  ncc_of_plmn_allowed values that will bit map to the desired NCCs.

For example, the ncc_of_plmn_allowed value of 51 would bit map as: 00110011

The first, second, fifth, and sixth bits are set which would allow NCC values of 0, 1, 4, and 5 to be broadcast on BCCH carriers.

Type A (no operator actions)

Supported by OMC-R GUI Yes

Cell numbers required Yes

Dependencies None

Syntax

Add/Change command strings

add_cell <gsm_cell_id> <location>

chg_element ncc_of_plmn_allowed <value> <location> <cell_desc>

chg_cell_element ncc_of_plmn_allowed <value> <cell_desc>

Display command strings

disp_cell <cell_desc> ["full"]

disp_element ncc_of_plmn_allowed <location> <cell_desc>

Values

Value type Integer

Valid range 0  to 255 (or 0 to FFh in Hex)

Default Value 255

 

Table 1 is a representation of the bit mapping of the ncc_of_plmn_allowed parameter. When a bit is set to 1, the corresponding NCC will be allowed. When a bit is set to 0, the corresponding NCC will not be allowed.

Table 1 Bit mapping of ncc_of_plmn_allowed

Bit position

128

64

32

16

8 4 2 1

NCC values

7 6 5 4 3 2 1 0

References

GSM parameter PLMN_PERMITTED, NCC

GSM specification 3.03-Annex A, NCCs per country12.20-5.2.8.7 cell Description-plmn-permitting4.08-10.5.2.15, figure 10.34 and table 10.285.08-9: PLMN_PERMITTED

bsic

Base Station Identity Code (BSIC)

Description

The bsic parameter specifies the Base Station Identity Code (BSIC).

The BSIC is a local colour code that allows an MS to distinguish between different neighbouring base stations. The BSIC is encoded on the Synchronization Channel.

The size of the BSIC is one octet made up of two values:

Network Colour Code (NCC). The NCC is three bits and is the same as the Public land mobile network (PLMN) Colour Code.

Base station Colour Code (BCC). The BCC is also three bits.

The values for the NCC and BCC may range from 000 to 111.

The structure of the BSIC octet is _ _ N C C B C C, where _ _ are unused. The BSIC is calculated using Table 1  and Table 2  in this description.

A BSIC for a PLMN may have one of eight values. A BSIC may be reused, but it is important that neighbour cells do not share the same BSIC and the same BCCH RF carrier.

NOTE The chg_element command can change the BSIC within an operational site. There is no requirement to unequip the RTF before making this change.

 

Subsystem/Process MULT

Type B (operator actions required)

Supported by OMC-R GUI

Yes

Cell numbers required Yes

Dependencies None

Operator actions Respond to the warning prompt which are displayed after the chg_cell_element or chg_element command is used to modify this parameter.

The warning prompt says:

WARNING: Changing this element will reset all DRIs associated with this cellAre you sure (y=yes,n=no)?

Syntax

Add/Change command strings

add_cell <gsm_cell_id> <location>

add_neighbor <src_gsm_cell_id> <neighbor_gsm_cell_id> <placement> [<list_type>]

chg_element bsic <value> <location> <cell_desc>

chg_cell_element bsic <value> <cell_desc>

NOTE Changing the bsic value may cause the system to take a carrier out of service. Calls on this carrier may be lost, depending on the availability of other carriers and timeslots not affected by the out-of-service carrier. If the carrier is baseband hopping the system removes it from the active hopping system until the next site reset. The system displays the following warning:WARNING:Changing this element will reset all DRIs associated with this cell Are you sure (y=yes, n=no)?A "Y" answer resets all the DRIs.

Display command strings

disp_cell <cell_desc> ["full"]

disp_element bsic <location> <cell_desc>

disp_neighbor <src_gsm_cell_id>

Values

Value type Integer

Valid range

 

Hex = 00h to 3Fh

Decimal = 0 to 63

(See Table 1 )

(See Table 2 )

Default Value None

 

Table 1  lists the hexadecimal values for the base station identity codes.

Table 1 Base Station Identity Code - Hexadecimal Values

NCC

BCC

0 1 2 3 4 5 6 7

0 0 1 2 3 4 5 6 7

1 8 9 A B C D E F

2 10

11

12

13

14

15

16

17

3 18

19

1A

1B

1C

1D

1E

1F

4 20

21

22

23

24

25

26

27

5 28

29

2A

2B

2C

2D

2E

2F

6 30

31

32

33

34

35

36

37

7 38

39

3A

3B

3C

3D

3E

3F

 

Table 2  lists the decimal values for the base station identity codes.

Table 2 Base Station Identity Code - Decimal Values

NCC

BCC

0 1 2 3 4 5 6 7

0 0 1 2 3 4 5 6 7

1 8 9 10

11

12

13

14

15

2 16

17

18

19

20

21

22

23

3 24

25

26

27

28

29

30

31

4 32

33

34

35

36

37

38

39

5 40

41

42

43

44

45

46

47

6 48

19

50

51

52

53

54

55

7 56

57

58

59

60

61

62

63

 

References

GSM parameter BSIC, BSIC_NC(n)

GSM specification 3.03 - 4.2.23.03 - Annex A12.20 - 5.2.8.212.20 - 5.2.8.7

Reciprocate Neighbour

Description

This parameter specifies whether to create a reciprocal neighbour while creating the neighbour. If it is set to 1 and environment variable. RECIPROCATE_NBR is set to TRUE, then it creates a reciprocal neighbour.

Values

0 = Disable Reciprocation

1 = Enable Reciprocation

Details

The following properties are applicable to the parameter:

DataType = BOOLEAN

Displayable Text = Reciprocate Neighbour

Optional = FALSE

BSS Access = No Access