S e t s t h e t h r e s h o ld l e ve l f o r j u d g i n g t h e n e i g h b o r i n g c e l l ( o t h e r T e s t S e t ) a t a l e v e l b e t t e r

t h a n t h e s e r v i n g c e l l ( t h e T e st S e t t h e m o b i l e i s c u r r e n t l y u s i n g ) w h e n t h e s e r v i n g c e l l i s

i m p r o va b l e ( r e f e r t o C 1 a n d C 2 v a l u e s b e l o w ) . S u g g e s t e d i n i t i a l v a l u e f o r t h i s p a r a m e t e r i s

6 d B .

Fast R e-S elect H yst eres is

S e t s t h e t h r e s h o ld l e ve l f o r j u d g i n g t h e n e i g h b o r i n g c e l l ( o t h e r T e s t S e t ) t o b e b e t t e r t h a n

t h e s e r v i n g c e l l ( t h e T e s t S e t m o b i l e i s c u r r e n t l y u s i n g ) w h e n t h e s e r v i n g c e l l is

r e l i n q u i s h a b l e ( r e f e r t o C 1 a n d C 2 v a l u e s b e l o w ) . S u g g e s t e d i n i t i a l v a l u e f o r t h i s

p a r a m e t e r i s 6 d B .

C1 a nd C2 V a lue s

In an act ive TE TR A N etw or k, t he mobil e is r equi r ed to scan the serving cell (base stati on it is

curr ently using ) and measur e t he signal level ( RS SI valu e). The dif fer ence betw een the R SS I value

and the Mi n R x Level For A c ce ss par ameter is kn own as 'C 1'. T he mobi le is also r equir ed to mon itor

neighb oring cells and cal cu late the diff erence betw een the RS SI value and t he Min Rx Level F or

Access p aramet er for each neighbo r cel l; t his valu e is kno wn as 'C 2'. The mobile uses t he C 1 an d

C2 values in conj unction wi th t he C ell Re- s electi o n par ameter s ( Fast Thre shold, Fast Hyst eresis,

Slo w T hresho ld, Slow H yster esis) t o make Cel l R e-sele ct ion decisions.

These decisions are only va lid w hen the co nditio ns have been establi shed f or a per iod o f 5 s and

ther e h ave bee n no pre v ious C ell Re- s elect ions f or a pe riod of 15 s; th e decisi ons ar e cat egor ized a s

follo ws:

S e r v i n g c e l l re linquisha ble: ( C 1 < F a s t T h r e s h o l d ) A N D ( C 2 > ( C 1 + F a s t H y st e r e s i s ) ) .

U s i n g t h e s u g g e s t e d v a l u e s, t h i s w o u l d b e s a t i s f i e d w i t h t h e c u r r e n t l y u s e d T e s t S e t R F

G e n e r a t o r L e v e l b e l o w - 8 7 d B m a n d t h e o t h e r T e s t S e t

h i g h e r .

S e r v i n g c e l l im pr ovable : ( C 1 < S l o w T h r e s h o l d ) A N D ( C 2 > ( C 1 + S l o w H y s t e r e s i s ) ) . U s i n g

t h e su g g e s t e d v al u e s , t h i s w o u l d b e s a t i s f i e d w i t h t h e c u r r e n t l y u s e d T e s t S e t R F G e n e r a t o r

L e v el b e l o w - 6 3 d B m a n d t h e o t h e r T e s t S e t

C e l l usab le: ( C 1 > ( F a st T h r e s h o l d + F a s t H y s t e r e s i s ) ) . U s i n g t he s u g g e s t e d v a l u e s , t h i s

w o u l d b e s a t i s f i e d w i t h t h e T e s t S e t

I n i t i a l c e l l se l e c t i o n : ( C 1 > 0 ) . U s i n g t h e s u g g e s t e d v a l u e s , t h i s w o u l d b e s a t i s f i e d w i t h t h e

T e s t S e t

RF Ge nerat or Level

R a d i o l i n k f a i l u r e : ( C 1 < 0 ) . U s i n g t h e s u g g e s t e d v a l u e s , t h i s w o u l d b e s a t i s f i e d w i t h t h e

T e s t S e t

RF Ge nerat or Level

T E T R A M S S y s t e m

R F Gene rato r Le vel

RF Gener ator Level

a b o v e - 1 0 5 d B m .

b e l o w - 1 0 5 d B m .

5-62

RF Ge nerat or Level