gsm原理介紹(英文版)(編輯修改稿)
2025-03-17 00:48 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 Authentication Centre (鑒權(quán)中心 ) HLR Home Location Register (歸屬位置寄存器 ) VLR Visitors Location Register (來(lái)訪位置寄存器 ) EIR Equipment Identity Register (設(shè)備標(biāo)識(shí)寄存器 ) NOKIA MSC BSC BSC BSC PSTN BTS BTS BTS Air Interface Abis Interface SS7 SS7 GSM Interface MS NOKIA GMSK Modulation 1 1 0 0 1 0 1 1 0 0 1 0 PSK Guassian Filter Spectrum 200kHz NOKIA Fc Fc + Fc + + Data Type ?0 Data Type ?1 Modulation NOKIA 4 0 1 2 3 4 5 6 7 1 2 3 4 5 6 Frequency Amplitude ARFCN Timeslot Physical Channel is an ARFCN and Timeslot TDMA and FDMA NOKIA TDMA and FDMA Terminology: FDMA Frequency Division Multiple Access TDMA Time Division Multiple Access ARFCN Absolute RF Channel Number TS Timeslot Physical The Combination of a TS number Channels and ARFCN. Logical Are Mapped on Physical Channels Channels NOKIA 10us 10us 10us 10us 8us 8us 3 3 1 1 57 57 26 148 Active Bits, 147 Useful Bits 70dB 30dB 6dB +4dB 6dB 30dB 70dB Tol Tol + GSM TDMA Power Burst NOKIA Power Time Template us / 147 Bits 10 8 10 10 8 10 Time Power 70 0 dB Upper Limit Lower Limit Actual us Normal Burst NOKIA Power Time Template us / 87 Bits 10 8 10 10 8 10 Time Power 70 0 dB Upper Limit Lower Limit Actual us Access Burst 87 bits NOKIA Uplink Downlink Downlink / MS Receive 5 6 7 0 1 2 3 4 5 6 7 0 1 3 4 2 0 6 7 0 1 2 3 4 5 6 7 1 3 4 2 Uplink / MS Transmit 5 NOKIA Uplink Downlink ARFCN 0 2 4 7 3 6 0 1 3 5 0 6 1 4 7 2 5 3 1 2 6 4 5 7 2 4 6 0 3 5 7 1 3 2 1 0 4 5 6 7 0 1 2 3 4 5 6 7 0 0 3 4 5 6 7 0 1 2 3 4 5 1 ARFCN UPLINK DOWNLINK 45MHz . Uplink Lags Downlink by 3 Timeslot periods . Uplink and Downlink use same Timeslot Number . Uplink and Downlink use
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