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Cu 1. Trnh by vic sp xp cc knh iu khin chung vo khe TS0 v tnhkhong thi gian thng tin iu khin trn cc knh c lp li?

Cu 2. Trnh by vic sp xp cc knh iu khin chung vo khe TS1v tnhkhong thi gian thng tin iu khin trn cc knh c lp li?

Cu 3. Trnh by cc knh logic trong GSM?

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Cu 4. T chc khung v cm trong GSM?

Cu 5. Cc phng php a truy cp trong thng tin di ng?

Cu 6. Cc knh logic CDMA?

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Cu 7. iu khin cng sut trong CDMA?

Cu 8. c im m PN?

Cu 9. Cu trc mng GSM?

Cu 10. Nhn thc trong GSM?

Cu 11. c im truyn sng trong thng tin di ng?

Cu 12. S x l thoi trong GSM, bin i A/D, m ha ting ni?

Cu 13. M ha knh trong GSM?

Cu 14. Nhiu C/A?

Cu 15. Tri ph trc tip v tri ph nhy tn?

Cu 16. iu khin cng sut trong CDMA?

Cu 17. iu khin chuyn giao trong CDMA?

Cu 18. Cu trc a l ca mng GSM?

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Cu 19.Nhiu C/I ?

Cu 20. Cc mu ti s dng tn s?

Cu 21. Cc loi m ha trong GPRS?

Cu 22. Qu trnh nng cp t cng ngh GSM (2G) ln cng ngh GPRS(2,5G) thc hin nh th no?

Cu 23.Cu trc Mng 3G theo chunWCDMA ?

Cu 24. Trnh by v bo hiu trong thng tin di ng?

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Cu 25. Suy hao ng truyn trong khng gian tdo c tnh theo cng thc:

Trong 1 cell, 1 MS ang lin lc vi BTS ti tn s

936 MHz. Hy cho bit:

a. Suy hao ng truyn khi MS cch BTS 3 km.

b. Gi s cng sut BTS ang pht sng l 20 W, hy cho bit MS c lin lc

c vi BTS khng khi nhy thu l -102 dBm ?

Cu 26. Theo m hnh Hata - Okomura

Ti vng th - URBAN

Lp (urb) = 69.55 + 26.16 * log(f) - 13.82*log(hb) -a(hm) +

( 44.9 - 6.55 * log( hb )) * log(d) (dB)

a(hm):H s hiu chnh anten MS,ph thuc din tch vng ph sng.

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- Din tch thnh ph trung bnh;

a(hm) = (1.1*log f - 0.7)hm -(1.56*log f - 0.8) (dB)

- Din tch thnh ph ln:

a(hm) = 8.29(log1.54hm)2

- 1.1 dB f = 300 MHz

Ti vng ngoi - SUBURBAN

Lp(sub) = Lp(urb)2 *( log(f/28))2 - 5.4 (dB)

Ti vng nng thn - RURAL (OPEN COUNTRY):

Lp(open) = Lp(urb)4.78 *(log(f))2 + 18.33*log(f) - 40.94 (dB)

Gi s ti mt cell vng ngoi , trm gc BS c cao 30 mt. Mt trm ding MS c cao anten trung bnh l 1,5 mt, ang lin lc vi trm gc titn s936 MHz. Hy xc nh:

a. Suy hao ng truyn khi MS cch BTS 3 km ?

b. Gi s cng sut BTS ang pht sng l 20 W, hy cho bit MS c lin lc

c vi BTS khng khi nhy my thu l -102 dBm ?

Cu 27.

Suy hao ng truyn trong khng gian tdo c tnh theo cng thc:

Trong 1 cell, 1 MS ang lin lc vi BTS ti tn s

950 MHz. Hy cho bit:

a. Suy hao ng truyn khi MS cch BTS 5 km.

b. Gi s cng sut BTS ang pht sng l 20 W, hy cho bit MS c lin lcc vi BTS khng khi nhy thu l -102 dBm ?

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Cu 28. Theo m hnh Hata - Okomura

Ti vng th - URBAN

Lp (urb) = 69.55 + 26.16 * log(f) - 13.82*log(hb) -a(hm) +

( 44.9 - 6.55 * log( hb )) * log(d) (dB)

a(hm):H s hiu chnh anten MS,ph thuc din tch vng ph sng.

- Din tch thnh ph trung bnh;

a(hm) = (1.1*log f - 0.7)hm -(1.56*log f - 0.8) (dB)

- Din tch thnh ph ln:

a(hm) = 8.29(log1.54hm)2

- 1.1 dB f = 300 MHz

Ti vng ngoi - SUBURBAN

Lp(sub) = Lp(urb)2 *( log(f/28))2 - 5.4 (dB)

Ti vng nng thn - RURAL (OPEN COUNTRY):

Lp(open) = Lp(urb)4.78 *(log(f))2 + 18.33*log(f) - 40.94 (dB)

Gi s ti mt cell vng ngoi , trm gc BS c cao 30 mt. Mt trm ding MS c cao anten trung bnh l 1,5 mt, ang lin lc vi trm gc titn s 950 MHz. Hy xc nh:

a. Suy hao ng truyn khi MS cch BTS 5 km ?

b. Gi s cng sut BTS ang pht sng l 20 W, hy cho bit MS c lin lc

c vi BTS khng khi nhy my thu l -102 dBm ?

Cu 29.Suy hao ng truyn m hnh cost231:

Lp(urb) = 46.3 + 33.9*log(f) - 13.82*log(hb) - a(hm)

+ [44.9 - 6.55*log(hb)]*log(d) + Cm (dB)

vi:

a(hm) = [1.1*log(f) - 0.7]*hm - [1.56*log(f) - 0.8]

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Ti thnh ph ctrung bnh hoc trung tm ngoi

Cm = 0 dB

Ti trung tm th

Cm = 3 dB

Gi s ti mt cell vng ngoi , trm gc BS c cao 30 mt. Mt trm ding MS c cao anten trung bnh l 1,5 mt, ang lin lc vi trm gc titn s 950 MHz. Hy xc nh:

a. Suy hao ng truyn khi MS cch BTS 5 km ?

b. Gi s cng sut BTS ang pht sng l 20 W, hy cho bit MS c lin lcc vi BTS khng khi nhy my thu l -102 dBm ?

Cu 30. Cho s chuyn giao sau, cho bit y l loi chuyn giao no vtrnh by qu trnh chuyn giao ny?

Cu 31. Cho s chuyn giao sau, cho bit y l loi chuyn giao no vtrnh by qu trnh chuyn giao ny?

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Cu 32. Cho s chuyn giao sau, cho bit y l loi chuyn giao no vtrnh by qu trnh chuyn giao ny?

Cu 33. Trnh by qu trnh thc hin dch v bn tin ngn SMS?

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Cu 34. Trnh by qu trnh thc hin cuc gi ny?

Cu 35.Trnh by qu trnh thc hin cuc gi ny?

Cu 36. Trnh by cp nht v tr trong MSC/VLR mi

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Cu 37. Trnh by cp nht v triws trong cng MSC/VLR

Cu 38. Trnh by qu trnh nhp mng IMSI.

Cu 39. Trnh by cc trng hp c khi MS trng thi ri

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Cu 40.Trnh by cc trng hp c khi MS trng thi bn

Cu 41.

Mng Viettel c cp 40 tn s, s dng mu lp 7/21 th hin lp tn s?

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Cu 42.

Mng Viettel c cp 40 tn s, s dng mu lp 3/9 th hin lp tn s?

Cu 43.

Mng Viettel c cp 40 tn s, s dng mu lp 4/12 th hin lp tn s?

Cu 44.

Mng Mobifone c cp 24 tn s, s dng mu lp 3/9 th hin lp tn s?

Cu 45.

Mng Mobifone c cp 24 tn s, s dng mu lp 4/12 th hin lp tn s?

Cu 46.

Mng Mobifone c cp 24 tn s, s dng mu lp 7/21 th hin lp tn s?

Cu 47.

Mng Vinafone c cp 30 tn s, s dng mu lp 3/9 th hin lp tn s?

Cu 48.

Mng Vinafone c cp 30 tn s, s dng mu lp 4/12 th hin lp tn s?

Cu 49

Mng Vinafone c cp 30 tn s, s dng mu lp 7/21 th hin lp tn s?

Cu 50

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