J.3 Performances

04.083GPPMobile radio interface Layer 3 specificationRelease 1998TS

The number of bits needed to encode a given set of values depends on the number of values and on the range they can span.

For the application on the BCCH and the SACCH (CA and BA information ) 16 octets are available, and the number of frequencies that can be encoded in one information element is the following:

Range Number

of frequencies

513 to 1024 2 to 16 (17 if frequency 0 is in)

257 to 512 2 to 18

129 to 256 2 to 22

113 to 128 2 to 29

up to 112 any

With two messages (for the BA) the number of frequencies that can be encoded is the following:

Range Number

of frequencies

513 to 1024 2 to 36 (note 1)

257 to 512 2 to 40 (note 2)

225 to 256 2 to 51 (note 3)

up to 224 any

NOTE 1: A 1024 range can be split cyclically in to two 512 ranges each with less than 18 frequencies; each subset is coded in one message with 512 range format.

NOTE 2: A 512 range can be split in to two consecutive 256 ranges. If both sub-ranges contain 22 frequencies or less, it is possible to code each of these in a messages using the 256 range format. Otherwise one of the two ranges contains 23 frequencies or more: 22 of them can be coded in one message using the 256 range format and the remaining frequencies (numbering less than or equal to 18) can be coded in the other message using the 512 range format.

NOTE 3: The principles described in notes 1 and 2, above apply in this case.

The frequency short list information element allows the following:

Range Number

of frequencies

513 to 1024 2 to 7 (8 if frequency 0 is in)

257 to 512 2 to 8

129 to 256 2 to 9

57 to 128 2 to 12

up to 56 any

The number of frequencies as a function of the range and the length in octets of the variable length frequency list information element (including the message type and length fields) is given by the following table:

Table J.1/3GPP TS 04.08: Performance of the variable length frequency list information element

Range

513 to 1024

257 to 512

129 to 256

up to
128

variable bit map

octets

5

1

1

1

1

8

6

2

2

3

3

16

7

3

3

4

4

24

8

4

4

5

6

32

9

5

6

6

8

40

10

6

7

8

10

48

11

7

8

9

12

56

12

9

9

11

14

64

13

10

11

13

16

72

14

11

12

14

18

80

15

12

13

16

21

88

16

13

15

18

24

96

17

14

16

20

26

104

18

16

18

22

29

112

19

17

19

24

32

120

20

18

21

26

‑‑

128

21

20

22

28

136

22

21

24

30

144

23

22

26

32

152

24

24

27

34

160

25

25

29

37

168

26

26

30

40

176

27

28

32

42

184

28

29

34

45

192

29

30

36

48

200

30

32

38

50

208

31

33

40

53

216

32

35

42

56

224