gsm協(xié)議棧設(shè)計(jì)結(jié)構(gòu)英文(編輯修改稿)
2025-06-10 04:55 本頁面
【文章內(nèi)容簡(jiǎn)介】 ures:These procedures are used to establish, maintain and release a MM connection between the mobile station and the network, over which an entity of the upper CM layer can exchange information with its peer. A MM connection establishment can only be performed if no MM specific procedure is running. More than one MM connection may be active at the same time. state chartMMC Finite State Machine is made of 7 state。MMC_GENE State deals with some message that need to be treated with whereas don’t treated with in 6 normal state.6 normal state is :MMC_NULL initiative state. power on，MM stand in the state。MMC_IDLE idle state，MM start all procedure in the state。MMC_WRRC state that wait the RR connection response. MMC_WNKR state that wait the network response message.MMC_CNTD MM connected。No less than one connection have been established.MMC_WNKC state that wait the network mand.6 RR RRISXR System eXecutive Real timeFSM Finite State MachineRRD Radio Resource Dedicated modeRRI Radio Resource Idle modeRRI_P Radio Resource Idle mode PLMN SelectionRRI_C Radio Resource Idle mode Cell SelectionL1 Layer 1 of GSM/GPRS systemMM Mobile ManagementLAP Link Access Protocol SummaryRRI module is part of Radio Resource Manage, main function is responsible for PLMN selection, Cell selection, Cell reselection, all System Message received and Measurement Report sent. It ‘s positioning in GSM protocol stack as below:Figure 1 RRI’s location in stack22 / 22 Object Model DiagramThe RRI have two objects, which implement different functions with independent finite state machine. The relationship between two objects (RRI_C and RRI_P) and the other extern objects displays in the figure below.Figure 1 RRI’s OMD Objects DescriptionThe object RRI_P pletes the following functions:178。 Automatic and manual PLMN selection.178。 Select designated PLMN.178。 PLMN reselection procedure.178。 PLMN selection mode setting.178。 Report available PLMN list.The object RRI_C pletes the following functions:178。 Normal cell selection.178。 Normal reselection.178。 Neighbour cell synchronization procedure.178。 Plmn scan procedure.178。 Cell changed in connected mode.178。 Acquisition of system information on BCCH and PBCCH.178。 Received system information on DCCH.178。 Measurements control and reporting.178。 Forwarding of paging information to MM layer.178。 Sending quality report. State chartrri_PNULL: Init State Wiat for a Start Command.rri_PWCS: Wait for a Cell from CSel. Psel has sent a Search to Csel and is waiting for it.rri_PCAMP: PSel is camped on a the selected Plmn.rri_PLTD: Limited Service state.rri_PNSVC: No service is detected sleep with a awake timer.rri_PCONN: In Connected Mode some restriction for MMI fution apply.rri_CNULL: Initial State. Can only receive a request fron PSel to start search a Plmn.rri_CRSSI: RSSI measurements are requested and Result is Waited ( for initial Cell selection).rri_CSYNCHR: Wait for a possible Synchro on a Cell. L1 will report the first possible synchro when found.rri_CSVERIF: Wait for receiveing All Sysinfo for Selecting a Cell.rri_CRVERIF: Wait for receiveing All Sysinfo for reselectiong a Cell.rri_CCAMPED: Camped on a Main Cell (can be on Any cell ie Emergency only).rri_CRESEL: Current serving Cell is not suitable any more. Wait for other cell information to be able to switch Cell.rri_CCONN: MS has engaged a circuit swicth connexion. Reselection is prohibited here.rri_CENDCO: MS has Terminated the circuit swicth connexion. Trys to select the Cell on witch we last werein Connected. RRD SummaryIn the GSM/GPRS stack, RRD is under MM , and up LAP and L1. RRD provides MM with services of RR connection establishment , management and data transmitting. RRD is short for RR in dedicated mode .RRD municates with MM , LAP and L1 with mailboxes Fig below describes RRD ‘s position in stack RRD in st
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