Ne Ig Hbor C E Ll B Roa Dc A St, C El L Sel E Ct I On, C El L Re -S El Ec Ti On A Nd C Al L Re St O Ra T I On; Configuration For Cell Re-Selec Tion Tests - Aeroflex 3900 Series Option Manual

N ei g h b o r C el l B r o ad c as t, C e l l S e l ec ti o n , C el l Re -s el e ct i o n an d
C a l l R e s t o r a t i o n
On an active TET RA Ne tw ork, a TE TR A Mo bile con tinual ly monit ors the si gnal st reng th of nei ghbor ing
base st ations ( cells) to de termin e wh ether it w ould obtain bett er ser vice fr om anot her base stat ion ( c ell).
This mo nitor ing opera tion is per for m ed w hen t he mob ile is idle on th e MC CH and whe n th e mobile is
engage d in a call on a Tr affi c Cha nnel. Th e mobile uses i nfor ma tion tra nsmitted by it s cur rent base
stat ion ( servin g cell) t o ide ntify the fr equencies on which to monito r ne ighbor cell s; t his inf ormat ion ( the
Nei ghbor C ell B road cast) also e nables t he mob ile t o make decisions about the signal level co nditio ns
under w hich it should at tempt to obt ain bett er service (p erfo rm Cell R e-sele ction) . Th e mobi le may also
use t his i nfor ma tion wh en f irst tur ned on t o det ermin e th e most suita ble b ase st ation on which to reg ister
(per for m In itial Cel l Se lection ). If the mobile is eng aged i n a ca ll w hen i t pe rfor ms C ell R e- se lection , it
also perf orms Call R estor ation signa ling on t he new base stat ion ( cell) in or der to contin ue w ith th e call .
Ther e ar e a numbe r of diff eren t type s of C ell R e-se lec tion which are used accor ding t o the mobile's ca ll
involvemen t and its monitor ing capabilit ies.
The Cell R e-select ion Ope rati ons suppo rte d by t he T est S et are describ ed in this section.
Tw o Test S ets ar e ne eded t o t est t he mobi le's ab ility t o pe rfor m th e C ell R e- se lection Opera tions.
Each T est Se t simulat es a separ ate TE TR A base st ation ( cell) , using di ffer ent car rie r fr equenci es, as
in a r eal TE TR A N etw ork. T he R F input s and out puts of the t wo T est S ets ar e combined so t hat t he
mobile can r eceive si gnals ge nerat ed b y each Test Set, and so t hat each Te st S et ca n re ceive
signals tra nsmitted by t he mobi le.

Configuration for Cell Re-selec tion Tests

The equipmen t r equir ed f or t hese t ests i s as f ollow s:
T w o 3 9 0 0 S e r i e s R a d i o T e s t S e t s .
6 d B P o w e r S p l i t t e r ( 3 - p o r t , 2 - w a y r e s i s t i v e d i v i d e r , 5 0 ) r a t e d f o r m o b i l e t r a n s m i t p o w e r .
5 0 a t t e n u a t o r r a t e d f o r m o b i le t r a n s m i t p o w e r ( o n l y i f n e c e s s a r y t o p r o t e c t s p l i t t e r ) .
C o n n e c t i n g c a b l e s .
1. Us e the pow er splitt er and co nnectin g cable s to connect the mobile to both Test S ets via
the pow er sp litte r.
2. Co nnect the R F port of each T est S et (nor mally t he
splitt er, and connect the mobile under test to the thir d po rt on t he spli tter .
3. Sel ect T ETR A MS S ystem on each Test Set .
4. The mobil e r eceives signal s ge nerat ed by each Test S et, subj ect to 6 dB loss. E ach Test
Set re ceives sign als tr ansmitt ed b y the mobile, subject to 6 dB loss. T he Te st S ets can
compensat e fo r t his loss, so t hat the displayed values for signal gener ator level and
mobile tra nsmitter po wer cor respon d to the levels a t t he mobil e's ant enna connecti on.
5. Sel ect t he
Genera tor and t he Test Se t RF An alyzer ( negati ve val ues i ndicate a loss, po si tive values
indicat e a gain) .
6. Set [Gen Offset ] S oft Key and [ Ana off set] Sof t K ey to ON.
T E T R A M S S y s t e m
Off sets C onfi gurat ion Tile
T /R Co
t o set off set va lues of - 6.0 d B f or the Test Set RF
5-59
nnector) to a por t on the