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ÌáÎÊÕß: taotao2008 ÌáÎÊʱ¼ä: 2011-12-10
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1¡¢GPRS¿ÉÓÃÈÝÁ¿¼ÆË㣺
• 2 TRXs, 16 RTSLs
• 2 RTSLs for signaling (BCCH + 1 SDCCH/8)
• 14 RTSLs for CS traffic
• CS BH traffic 8 Erl per BTS ¨C all BTSs have same BH traffic
• Erlang B table ¨C 1.7% CS blocking @ BH
• Mean free RTSLs = 1.5
• Average available for PS traffic @ CS BH
Amount_of_TRXs*8 - signaling_RTSLs ¨C CS_BH_traffic-free_RTSLs =
2*8-2-8 -1.5 = 4.5 RTSLs
2¡¢Êý¾ÝÒµÎñÈÝÁ¿ÐèÇó£º
• MS multislot capability (4 RTSLs)
• Data throughput 200 kbit/s
• Air interface ¨C 35 kbit/RTSL
• RTSLs need to support 200 kbit/s£º
200/35 = 5.7 TSLs ~ 6 RTSLs
• Default territory size need£º
• Max(MS_multislot, traffic) = 6 RTSLs
3¡¢»ùÕ¾ÅäÖÃÐèÇó£º
• Available RTSLs for CS traffic per BTS
14 ¨C 3 (CDED) = 11 RTSLs
• Traffic per BTS = 8 Erl
Erlang B (8Erl, 11 TSLs) = 8.12 % CS blocking
5.1% > 2% - NOK
Needed channels for 2% CS blocking
Erlang B (8Erl,2%) = 14 channels
• Either 3 more RTSLs (DR/HR) are needed or one new TRX
1¡¢GPRS¿ÉÓÃÈÝÁ¿¼ÆË㣺
• 2 TRXs, 16 RTSLs
• 2 RTSLs for signaling (BCCH + 1 SDCCH/8)
• 14 RTSLs for CS traffic
• CS BH traffic 8 Erl per BTS ¨C all BTSs have same BH traffic
• Erlang B table ¨C 1.7% CS blocking @ BH
• Mean free RTSLs = 1.5
• Average available for PS traffic @ CS BH
Amount_of_TRXs*8 - signaling_RTSLs ¨C CS_BH_traffic-free_RTSLs =
2*
2¡¢Êý¾ÝÒµÎñÈÝÁ¿ÐèÇó£º
• MS multislot capability (4 RTSLs)
• Data throughput 200 kbit/s
• Air interface ¨C 35 kbit/RTSL
• RTSLs need to support 200 kbit/s£º
200/35 = 5.7 TSLs ~ 6 RTSLs
• Default territory size need£º
• Max(MS_multislot, traffic) = 6 RTSLs
3¡¢»ùÕ¾ÅäÖÃÐèÇó£º
• Available RTSLs for CS traffic per BTS
14 ¨C 3 (CDED) = 11 RTSLs
• Traffic per BTS = 8 Erl
Erlang B (8Erl, 11 TSLs) = 8.12 % CS blocking
5.1% > 2% - NOK
Needed channels for 2% CS blocking
Erlang B (8Erl,2%) = 14 channels
• Either 3 more RTSLs (DR/HR) are needed or one new TRX
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»Ø´ðʱ¼ä£º2011-12-17 11:30
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