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copy of gsm系统消息的介绍 x（Copy of GSM system message introduction x）.doc

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copy of gsm系统消息的介绍 x（Copy of GSM system message introduction x）

copy of gsm系统消息的介绍 x（Copy of GSM system message introduction x） Introduction to GSM system messages MS in order to obtain or provide a wide range of services, usually need to get a lot of information from the network. These messages broadcast on the wireless interface are called system messages and can be divided into 12 types: TYPE1, 2, 2bis, 2ter, 3, 4, 5, 5bis, 5ter, 6, 7, 8. Each system message has the following different elements to make up: 1 、 current network, location area, and cell identification message; 2, the cell provides handover measurement report messages and cell selection process messages; 3, the description message of the current control channel structure; 4, the District of different options news; 5, about the allocation of BCCH frequency points in the community. System messages are transmitted in two logical channels, BCCH or SACCH channels: 1. In idle MODE, the network transmits system messages 1~4, 7, 8 through the BCCH channel; 2, transmit system messages 5 and 6 (including 5bis and 5ter messages) over the SACCH channel over the communication MODE. 3, each system message contains the following main content as follows: 1) system message type 1: description of cell channel, +RACH control parameter. 2) system message type 2: adjacent cell BCCH frequency point describes the +RACH control message + allowed PLMN. 3) system message type 2bis: extended neighbor cell BCCH frequency point describes the +RACH control message. 4) system message type 2ter: extended neighbor cell BCCH frequency point description 2. 5) system message type 3: cell identification (CELLID) + location area identification (LAI) + control channel description + cell selection + cell selection parameter +RACH control parameters. 6) system message type 4: location identification + cell selection parameter, +RACH control parameter, +CBCH channel description, +CBCH mobile configuration. 7) system message type 5: description of adjacent cell BCCH frequency point. 8) the system message