GSM网络规划(english).doc

GSM NETWORK PLANING-SWITCHINGGSM网络规划张晓丹This test consists of 17 questions. To answer choose on of the three alternatives and mark on the answering sheet.Pocket calculator and Erlang table is required1) How many traffic channels can maximum be handled by a TRX?A) 1 B) 4 C) 82) How many TS are required on the Abis interface per TRX if LAPD A) 2 B) 2,25 C) 33) How many TSs and E1s are required to connect the following access network to a BSC when a DXC is used to get maximum utilization of the E1s? Access network with 30 sites of type 3/3/3 and 20 sites of type 2/2/2. LAPD-multiplexing and LAPD-concentration is used. A) 870 TSs, 29 E1s B) 848 TSs, 28 E1s C) 780 TSs, 26 E1s4) How many TSs and E1 are required for traffic on the Aatr interface when the traffic to be supported is 710 Erlang and GoS =1% A) 738 TSs, 24 E1s B) 185 TSs, 6 E1s C) 683 TSs, 23 E1s5) Which type of routing is used for mobile to land traffic in the picture below?A) Near-end drop B) Cascading C) Far-end drop6) Is flat, meshed network architecture best used in small, large or medium networks? A) Small B) Medium C) Large7) How many physical connections are required in a network with 10 MSCs in a flat fully meshed network and in a hierarchical transit network with two transits?A) 100 (meshed), 10 (transit)B) 45 (meshed), 20 (transit)C) 100 (meshed), 20 (transit)8) Which of the following Signaling System No. 7 Protocols are used for routing of signaling messages? A) MAP, TCAP B) TCAP, SCCP C) MTP, SCP9) Which protocol performs the addressing for circuit related signaling? A) MTP B) SCCP C) ISUP10) What is the input and output information is GTT?A) input: GT, output: DPCB) input: B number, output: DPCC) input DPC, output: GT11) A link set has three signaling links, on which load sharing is used and the maximum load per signaling link is 30%. What will be the maximum signaling volume that can be carried on this link set? A) 192 kbit/s B) 57,6 kbit/s C) 51,2 kbit/s12) What is the difference between message transfer on a) MTP and b) SCCP level in STP?A) a) GTT is in STP, b) no GTT in STPB) a) no GTT in STP, b) GTT in STPC) no difference13) Calculate the signaling volume generated on the A interface in the PLMN shown below.Input data: 50 000 subscribers, traffic per subscriber is 25mE, MHT = 100 s, number of location updates=1 per/subscriber/busy hour, octets/call (to BSC/TRC)=270, octets/call (from BSC/TRC) = 280, octets/location updating (to, BSC/TRC) = 130, octets/location updating (from BSC/TRC) = 87.A) 79,1 kbit/s B) 42,4 kbit/s C) 41,4 kbit/s 14) Calculate the processor capacity in terms of calls/s when the traffic load is 72% and the load per call is 25ms. A) 28,8 calls/s B)31,4 calls/s C)33,8 calls/s15) If the MHT increases how will the capacity of the processor, in terms of number of calls/s, be influensed (all non-traffic related parameters are kept the same)?A) the processor capacity will decreaseB) no changeC) the processor capacity will increase16) Which new HW units is required in the BSC when GPRS is introduced?A) CPU B) PCU C) GPU17) Calculate the total amount of traffic on the MSC to MSC connection in the network shown below. Input data:City A : #subscribers = 60 000Traffic/subscriber = 25 mEMS - PSTN traffic = 65% MS - MS traffic (total) = 7%Local traffic = 75% Long distance traffic (i.e. to/from city B) = 25%City B: #subscribers = 43 000Traffic/subscriber = 25 mEMS - PSTN traffic = 65%PSTN MS