课程名称︰个人通讯服务
课程性质︰资工所 网媒所 选修
课程教师︰林风
开课学院：电资学院
开课系所︰资工所
考试日期（年月日）︰2014/11/5
考试时限（分钟）：3hr
是否需发放奖励金：是
（如未明确表示，则不予发放）
试题 :
总共25题复选题,k每题四分共一百分
每题共有五个选项,答对一个选项得4/5分,答错一个选项倒扣4/5分
未答之题,该题得0分
1.The following PCS systems adopt differnet radio access technologies.
Select the right parings for the PCS system and the corresponding radio access
technologies.
(a)GSM(TDMA/FDMA) (b)DECT(TDMA/FDMA) (c)CT2(TDMA) (d)IS-95(FDMA)
(e)IS-136(TDMA/FDMA)
2.What PCS systems adopt FDD duplexing technology?
(a)IS-136 (b)CT2 (c)GSM (d)PHS (e)PACS
3.Waht kinds of information are stored for an MS in GSM HLR?
(a)IMSI (b)TMSI (c)MSISDN (d)The address of the MSC that serves the MS
(e)LAI
4.Waht kinds of information are stored for an MS in GSM VLR?
(a)IMSI (b)The address of the HLR that serves the MS
(c)MSISDN (d)The address of the MSC that serves the MS (e)LAI
5.Fig.1 shows the flowcharts for the GSM authentication and encryption
/decryption procedures.
(a)A3 (b)A8 (c)Ki (d)A5 (e)Kc
6.For the "high-tier" PCS systems, please choose the correct statements.
(a)The cell size is large and range from 0.5km to 35 km.
(b)The user speed is medium(<=96km/hr)
(c)The coverage arean is large and continuous such as macro cells.
(d)The speech coding rate is high.(32kbps)
(e)The handset complexity is low.
7.Fig.2 show the messagr flow for the GSM basic cal origination procedures
for radio aspect. Please choose the correct steps.
(a)Step1 (b)Step2 (c)Step3 (d)step4 (e)step5
8.For the SSP node in the SS7 network, please choose the correct statements.
(a)SSP is a telephone switch interconnected by SS7 links.
(b)SSP is a switch that relays SS7 msgs between network switches and database.
(c)SSP performs call processing on calls that originate, or terminate at that
node.
(d)Based on the address fields of the SS7 messages, the SSPs route the message
to the correct out-going signaling links.
(e)An SSP in a PCS network is called a mobile switching center(MSC).
9.For the STP node in the SS7 network, please chooes the correct statements.
(a)STP is a telephone switch interconnected by SS7 links.
(b)STP is a switch that relays SS7 messages between network switches and DB.
(c)STP performs call processing on calls that orignate, or terminate at that
node.
(d)Based on the address fields of the SS7 messages, the STPs route the message
to the correct out-going signaling links.
(e)An SSP in a PCS network is called a mobile switching center(MSC).
10.What are not protocol layers for an SS7 network?
(a)MTP Layer4 (b)Network Layer (c)SCCP (d)TCAP (e)MAP
11.Which statements are correct for the SS7 network protocol?
(a)MTP layer2 provides reliable transfer of signaling messages between 2
directly connected signaling points.
(b)TCAP provides additional functions(e.g. global title translation: GTT) to
MTP to transfer non-circut-related signaling information.
(c)SCCP provides the ability to exchange information between application
using non-circuit-related signaling.
(d)ISUP established circuit-switched network connections (e.g. for call setup)
by exchanging signaling messages amoung each switching point involved in a
call connection.
(e)GSM MAP are implemented on top of TCAP.
12.Please choose the correct cases for iner-system the anchor approach applied
in the inter-system handover.
(a)handoff forward
(b)handoff bachward
(c)handoff the the third
(d)Path minimization
(e)relay node
13.In the GSM call setup procedure for the onternational roaming, consider a
scenario where Jenny (in singapore) places a call to John (who roamed from
Taiwan to Singapore). The message flow for this scenario is shown in Fig.3.
Which statements are correct?
(a)At step1, Jenny first dials the Internation Switch Center Access Code(ISCA)
+ Country Code(CC) + Jenny's MSISDN to the PSTN Switch A.
(b)At step1.1, when the PSTN Switch A interprets the CC, it identifies the call
as an international call, then sets up the call to Singapore's ISC B.
(c)At step1.2, based on the CC, ISC B routes the call to Taiwan ISC C.
(d)At step1.3, ISC C interprets the prefix of remaining digits, and setup the
voice trunk to GMSC D.
(e)After international GSM call setup has been completed, th voice path is
1->1.1->6.3
14.Which statements are correct for the GPRS system?
(a)GPRS reuses the GSM radio access technologies (i.e. TDMA) to provide end-to
-end-switched services.
(b)The radio access network of the GPRS neteork can be replaced with IS-136.
(c)In GPRS, one to eight time slot can be allocated to a user, several active
user can share a single time slot, where the uplinks and the downlinks are
allocated separately.
(d)In GPRS, various radio channel coding schemas are specified to allow bit
rates from 128 kbps to 256kbps.
(e)GPRS fast reservation is designed to start packet transmission within
0.01 to 0.1 seconds.
15.What are the correct statements for GPRS?
(a)The BSS and SGSN implement the Relay function
(b)There are three MM(Mobility Management) states(including IDLE, STANDBY, and
READY) defined to describe the mobility of a GPRS MS.
(c)The GPRS security functionality is equivalent to the GSM security
functionaliy.
(d)The network protocol between SGSN and GGSN is based on the frame relay
network.
(e)The network protocol between SGSN and BSS is based on the IP network.
16.Which statements are incorrect for the comparison of MCHO,NCHO and MAHO?
(a)MCHO is used in CT-2
(b)Among the 3 handover mechanisms, NCHO has the lightest signal overhead.
(c)In MAHO, the handover is initiated by MS.
(d)MAHO is adopted in GSM.
(e)In NCHO, the network make the handoff decision based on the measurement
report from the MS.
17.Fig.4 shows the GSM call termination procedure which consists of 13 major
steps. For the description of each step, which statements are wrong?
(a)At step 3, VLR is queried by HLR to provide MSRN for the called MS.
(b)At step 3, the signal msg is MAP_RESTORE_DATA
(c)At step 4, VLR route a call by using TMSI of the called MS as routing to
route a call the MS.
(d)At step 8, MSRN is sent back to the GMSC to setup the call.
(e)At step 8, the signal msg is MAP_SEND_ROUTING_INFORMATION
18.For the description of each step in Fig.4(the GSM call termination
procedure), which statements are wrong?
(a)At step 1, the PSTN routes the call to the GMSC by using the IMSI of the
called MS.
(b)At step 2, the GMSC queries HLR to obtain the MSRN(i.e. the address of Taget
MSC) for the calles MS by using the MSISDN of the MS.
(c)At step 6, the HLR sends the routing information to the VLR using the
MAP_INSERT_SUBSCRIBER_DATA msg.
(d)At step 6, the HLR sends the routing information to the VLR by sending the
ISUP IAM msg.
(e)After step 6, the service information of the VLR record has been recovered.
19.Fig. shows the msg flow for theMS that has the interVLR movement, which
consist of 9 major steps. Which statements are wrong for Fig.5?
(a)The signal message sent at step2 is MAP_UPDATE_LOCATION
(b)At step 3, VLR1 sends a msg (carrying the IMSI of the MS) to VLR2.
(c)At step 4, VLR2 sends a registration msg to update the HLR.
(d)At step 6, VLR2 receives the IMSI in order to obtain the HLR address for MS
(e)After Step 8, the record of the MS in VLR1 is deleted.
20.Which statement is wrong for Fig.5?
(a)The signaling msg sent at step 1 is MAP_UPDATE_LOCATION_AREA
(b)The signaling msg sent at step 6 is MAP_UPDATE_LOCATION_AREA
(c)The signaling msg snet at step 6 is MAP_CANCEL_LOCATION
(d)At step 4, the signaling msg MAP_UPDATE_LOCATION is sent by VLR2
(e)VLR 2 obtains the IMSI of the MS form HLR.
21.Which logical channel in the GSM air interface are categorized as CCCH?
(a)SDCCH
(b)RACH
(c)PCH
(d)FCCH
(e)FACCH
22.Whcih logical channel in the GSM air interface are categorized as DCCH?
(a)SDCCH
(b)RACH
(c)PCH
(d)FCCH
(e)FACCH
23.For the functionalities in the logical channel of the GSM air interface,
which statements are incorrect
(a)AGCH is used by the network to inicate radio link allocation upon prime
access of an MS.
(b)PCH is for an MS to have initial access to the network.
(c)Several MSs may access the same RACH, potentially resulting in collisions.
(d)PCH is used by the network to page the destination MS in call termination.
(e)AGCH is an up-link channel.
24.For the GSM short msg service(SMS), which satements are correct?
(a)The GSM SMS provides a connectionless transfer of message with low-capacity
and low-time performance.
(b)The GSM SMS operates like a paging service, with the added capacity that
msg can pass in both directions.
(c)The GSM SMS can contain up(i.e. maximun) 14 octects.
(d)The bottleneck of the GSM SMS is the MS
(e)The GSM SMS are transported on the GSM SACCH signaling channel
25.What are the technologies for 3G networks?
(a)WCDMA
(b)LTE
(c)WiMAX
(d)UMTS
(e)cdma2000
(e)