gprs介紹-文庫吧資料
2025-07-21 18:49本頁面
【正文】 ol) ? Multiplexing of data packets from one or several applications onto one logic link. ? Compression of redundant protocol information and user data. ? Segmentation and reassemble. GPRS Air Interface ? Protocol Stack ? Radio Blocks ? Logical Channels ? GPRS MS States and Modes ? Network Operation Mode ? Paging and Packet Transfer ? Cell Selection and Reselection GPRS Air Interface ? Protocol Stack ? Radio Blocks ? Logical Channels ? GPRS MS States and Modes ? Network Operation Mode ? Paging and Packet Transfer ? Cell Selection and Reselection Logical Channel in GSM PDCH Allocation ? All PDCH are allocated to the PCU. ? One PSET( PDCH set) can consist maximum 4 consecutive TS. ? MS can only be assigned PDCH from one PSET. ? Dedicated and/or Ondemand PDCH ? 08 dedicated GPRS channels / cell ? unlimited number of ondemand (dynamic) GPRS channels /cell ? CS can preempt dynamic GPRS channels ? First dedicated PDCH carries PCCCH GPRS Air Interface ? Protocol Stack ? Radio Blocks ? Logical Channels ? GPRS MS States and Modes ? Network Operation Mode ? Paging and Packet Transfer ? Cell Selection and Reselection GPRS Air Interface ? Protocol Stack ? Radio Blocks ? Logical Channels ? GPRS MS States and Modes ? Network Operation Mode ? Paging and Packet Transfer ? Cell Selection and Reselection Network Operation Mode ? three types of work operation mode:I, II, III ? The work operation mode shall be indicated as system information to MSs ? same operation mode in each cell of a routing area ? Routing Area is a subset of Location Area Network Operation Mode I ? bined Location Area and Routing Area update ? bined paging CS and PS paging on the same channel ? longer sleep periods for MS ? smaller paging load ( paged within Routing Area) ? Gs interface Network Operation Mode II ? separate Location Area and Routing Area update ? bined paging both CS and PS paging only on the PCH ? longer sleep periods for MS ? MS is paged within Location Area in case of CS ? no Gs interface Network Operation Mode III ? separate Location Area and Routing Area update ? CS paging on PCH PS paging on PCH or PPCH ? shorter sleep periods for MS ? MS is paged within Location Area ? no Gs interface GPRS Air Interface ? Protocol Stack ? Radio Blocks ? Logical Channels ? GPRS MS States and Modes ? Network Operation Mode ? Paging and Packet Transfer ? Cell Selection and Reselection PAGING ? Network operation mode I – Class A or B
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