gsm邻区扫描,切换问题（GSM adjacent area scan, switching problem）.docVIP

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gsm邻区扫描,切换问题（GSM adjacent area scan, switching problem）.doc

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gsm邻区扫描,切换问题（GSM adjacent area scan, switching problem）

gsm邻区扫描,切换问题（GSM adjacent area scan, switching problem） The number of neighbor relation shows this is not the adjacent area, but in the BALIST District, the 6 district is displayed the strongest signal, that is to say, if the 6 district did not set the neighbour relation, still can not switch. Moreover, when the BCCH and BSIC decode faster than the idle state, it looks like what you said, the number of neighbor relationships displayed in idle state is significantly less than the number of neighborhood relationships displayed in the call state.. Similarly, a cell set up the neighborhood relationship, but there is no BALIST, the phone will not measure the frequency, and will not show in the neighborhood list, and naturally can not switch. What is BALIST? BA table; This parameter represents the 2G neighborhood frequency point, and each adds a 2G neighborhood, which is added sequentially in the 2G cell BA table (manual and automatic adjustment), which is issued under the system message GSMBA1 table: Neighbor frequency idle state GSMBA2 table: Neighbor frequency activation The role of the BA table: The BA table is the table where adjacent frequency points are stored BA1: store the adjacent area frequency in the idle mode; the system message 2 is issued; BA2: store adjacent frequency points in active mode; system message 5 is issued below The MS measures the signal strength of the service cell and the adjacent cell BCCH carrier in idle and activated modes only at frequency points defined in the BA table. The measurement results in idle mode is used to select the best lock cell (i.e. cell reselection); in active mode, the LOCATING algorithm according to the measurement results, the result is the handoff (if the adjacent area, there is no error parameters.). The BA table says, in plain terms, a list of frequencies provided by the network for the MS, which is measured by the frequency on the list of MS. Without this list, in idle mode, the MS frequency point of full frequenc