GSM信令流程_英文版课件.ppt

Signal Process;Call Process (in network);Roaming (location update);Incoming call;Outgoing call from MS;Inter-MSC handover;Use of Channel (in Um);Use of channels - roaming;Use of channels - outgoing call;Use of channels - incoming call;Use of channels - handover;Signal Process (BSS);MS;MS;MS;MS;MS;MS;MS;MS;MS;信道请求(Channel Request) ESTABLISHMENT CAUSE(3~6bit) RANDOM REFERENCE(5~2bit);信道激活(Channel Activation) Channel number Activation type(3bit,立即指配、指配、切换等) Channel Mode(表示话音、数据或信令，以及相应属性) Channel Identification(绝对频道号或跳频参数) Handover Reference(条件：切换) Timing Advance(条件：小区内信道改变);立即指配命令(Immediate assign command) Full Imm. Assign Inf IMMEDIATE ASSIGN IMMEDIATE ASSIGN EXTENDED IMMEDIATE ASSIGN REJECT;CM业务请求(CM service request) CM Service type(移动主叫、紧急呼、短消息业务等) Ciphering key sequence number Mobile station Classmark 发射功率等级 支持的???密算法 伪同步能力 短消息能力等 Mobile Identity;鉴权请求(Authentication request) Ciphering key sequence number Authentication parameter RAND;加密模式命令(Cipher mode command) Encryption Information Cipher Response Mode (可选项，响应消息中是否包含IMEI);建立(Setup) Bearer capability 信息传送能力、方式 编码标准等 Called party BCD number CC capabilities(移动台是否支持DTMF);指配请求(Assignment Request) Channel Type speech/data indicator channel rate and type speech encoding algorithm or data rate transparency indicator Priority Circuit Identity Code;指配完成(Assignment Complete) RR Cause (可选项) Circuit Identity Code (BSS分配电路时使用) Cell Identifier (小区改变时使用) Chosen Channel(选择信道速率/类型时使用) Chosen Encryption Algorithm(改变加密算法时使用) Circuit Pool(存在多个电路池时使用) Speech Version (Chosen) (选择了语音版本时使用);寻呼(Paging) IMSI TMSI(可选项) Cell Identifier List(规定寻呼命令发送范围)