GSM相关参数取值及含义.docx

1、GSM相关参数取值及含义Rxqual的取值及含义RXQUAL取值含义RXQUAL_0BER 0,2%RXQUAL_10,2%BER0,4%RXQUAL_20,4%BER0,8% RXQUAL_30,8%BER1,6% RXQUAL_41,6%BER3,2%RXQUAL_53,2%BER6,4%RXQUAL_66,4%BER12,8%RXQUAL_712,8%=CRO，并且CRO -48dBm等级634849-48dBm等级62108109-108dBm等级2109110-109dBm等级1110 -110dBm等级0MS TX Power Max CCH（控制信道最大发射功率）移动台与BTS的

2、通信过程中，其发射功率是受网络控制的。网络通过功率命令对移动台进行功率设置，该命令在慢速随路控制信道（SACCH）上传送，（SACCH有两个头字节，一个是功率控制字节，另一个是时间提前量）。移动台必须从下行的SACCH中提取功率控制头，并以其规定的发射功率作为输出功率，若移动台的功率等级无法输出该功率值，则以能输出的最相近的发射功率输出。MS TX Power Max CCH采用十进制表示，单位为dBm，范围为：GSM900: 1343，步长为2dB。GSM1800: 430，步长为2dB。一般的设置建议为33dBm（对应GSM900）和30dBm（对应GSM1800）。MS PowerFor

3、 GMSK modulationPowerGSM400 & GSM900 & GSM 850 & GSM 700DCS1 800PCS1900 Tolerance (dB)classNominal Maximum outputNominal Maximum outputNominal Maximum outputfor conditionspowerpowerpowernormalextreme1 1 W (30dBm)1 W (30dBm)22,528 W (39dBm)0,25 W (24dBm)0,25 W (24dBm)22,535 W (37dBm)4 W (36dBm)2 W (3

4、3dBm)22,542 W (33dBm)22,550,8 W (29dBm)22,5For 8-PSK modulationPowerGSM 400 and GSM900 & GSM 850 & GSM 700GSM 400 and GSM900 & GSM 850 & GSM 700DCS1800PCS1900DCS1800 & PCS1900 classNominal Maximum outputTolerance (dB) for conditions Nominal Maximum outputNominal Maximum outputTolerance (dB) for cond

5、itions PowernormalextremepowerpowernormalextremeE133 dBm 22,530 dBm 30 dBm 22,5E227 dBm 3426 dBm 26 dBm -4/+3-4,5/+4E323 dBm 3422 dBm 22 dBm 34GMM Service State三种取值：0（Stand by）、1（Ready）、2（Idle）。Idle状态时，MS还没有Attach到GPRS网络，没有和SGSN建立联系；此时可以进行PLMN选择、GPRS小区选择及重选过程。Standby状态时，MS已经Attach到GPRS网络，MS和SGSN之间已经

6、建立了MM上下文（路由区等级，SGSN可以知道MS在哪个RAC，但不知道具体在哪个Cell），但不能进行数据的发送和接收；此时可以进行GPRS小区选择及重选过程、路由区更新；在Standby状态时，MS可以激活或去激活PDP Contexts。Ready状态时，SGSN可以精确知道MS在哪个Cell，此时可以进行GPRS小区选择及重选过程；在Ready状态时，MS可以激活或去激活PDP Contexts。NMO（Network Mode Of Operation）使用两个字节定义：00 Network Mode Of Operation I01 Network Mode Of Operatio

7、n II10 Network Mode Of Operation III11 ReservedNetwork Mode Of Operation I，存在Gs接口，寻呼消息通过SGSN发送。Network Mode Of Operation II，不存在Gs接口，寻呼消息通过A接口发送，小区中不分配PCCCH（分组公共控制信道）信道。Network Mode Of Operation III，不存在Gs接口，寻呼消息通过A接口发送；GPRS寻呼时，如果小区分配了分组寻呼信道，则将使用PCCCH。Attach State四种取值：0（not GPRS-attached）、1（GPRS-attac

8、hed while IMSI-attached）、2（GPRS only-attached）、3（combined-attached）。Paging Request Type 1/2/3Paging Request Type 1信令由网络通过CCCH信道发送给MS（最多两个MS）。如MS处于Idle状态，则会触发信道接入；如MS处于Packet Idle状态，则会传输MM信息（如触发一个小区更新过程）。MS由TMSI、PTMSI、IMSI进行识别。Table 1: Radio subsystem link control parametersParameter nameDescriptionR

9、angeBitsChannelBSICBase station Identification Code0636SCH D/LBABCCH AllocationBCCH D/LBA_INDSequence number of BA0/11BCCH D/LMS_TXPWR_MAX_CCHThe maximum TX power level an0/315BCCH D/LMS may use when accessing thesystem until otherwisecommanded.POWER OFFSETThe power offset will be used in 032BCCH D/

10、Lconjunction with the MS TXPWR MAX CCH parameterby the class 3 DCS1800 MS:0 = 0 dB1 = 2dB2 = 4dB3 = 6dBRXLEV_ACCESS_MINMinimum received signal level at the MS0636BCCH D/Lrequired for access to the system.RADIO_LINK_TIMEOUTThe maximum value of the radio4BCCH D/Llink counter 464 SACCH blocks,SACCH D/L

11、15 steps of 4 SACCH blocksCELL_RESELECT_HYSTERESISRXLEV hysteresis for required073BCCH D/Lcell reselection. 014dB, 2dBsteps, i.e. 0 = 0 dB, 1 = 2dB, etc.NCC_PERMITTEDBit map of NCCs for which the MS is permitted to report measurement results.Bit map relates to NCC part of BSIC.8BCCH D/L SACCH D/LCEL

12、L_BAR_ACCESSSee table 1a.0/11BCCH D/LCELL_BAR_QUALIFYSee table 1a0/11BCCH D/LCELL_RESELECT_OFFSETApplies an offset to the C2 0636BCCH D/Lreselectioncriterion. 0 126dB,2dB steps, i.e. 0 = 0 dB, 1 = 2dB, etc.TEMPORARY_OFFSETApplies a negative offset to C2 for 073BCCH D/Lthe duration of PENALTY_TIME. 0

13、 60dB, 10dB steps i.e. 0 = 0 dB,.1 = 10dB, etc. and 7 = infinityPENALTY_TIMEGives the duration for which the 0315BCCH D/Ltemporary offset is applied. 20 to 620 s, 20 s steps, i.e. 0 = 20 s, 1 = 40 s, etc.31 is reserved to indicate thatCELL_RESELECT_OFFSET issubtracted from C2 andTEMPORARY_OFFSET is

14、ignored.LSA_OFFSETApplies an offset to be used for LSA cell re- selection between cells with the same LSA priorities. 0 = 0 dB, 1 = 4 dB, 2 = 8 dB, 3 = 16 dB, 4 = 24 dB, 5 = 32 dB, 6 = 48 dB, 7 =64 dB0-73BCCH D/LPRIO_THRThe PRIO signal strength threshold is related to RXLEV_ACCESS_MIN.0 = 0 dB, 1 =

15、6 dB, 2 = 12 dB, 3 = 18 dB4 = 24 dB, 5 = 30 dB, 6 = 36 dB, 7 = dB0-73BCCH D/LLSA IDThe LSA identities for the cellBCCH D/LQsearch_ISearch for 3G cells if signal level is below (07) or above (815) threshold0 = - 98 dBm, 1 = - 94 dBm, , 6 = - 74 dBm, 7 = (always) 8 = - 78 dBm, 9 = - 74 dBm, , 14 = - 5

16、4 dBm, 15 = (never).Default value = (never).0-154BCCH D/LQsearch_C_InitialIndicates the Qsearch value to be used in connected mode before Qsearch_C is received,0 = use Qsearch_I, 1 = (always).Default value = use Qsearch_I.0/11BCCH D/LXXX_QoffsetApplies an offset to RLA_C for cell reselection to acce

17、ss technology/mode XXX (one or more)0 = - (always select a cell if acceptable), 1 = -28 dB, 2 = -24 dB, , 15 = 28 dB.Default value = 0 dB.0-154BCCH D/LFDD_QminA minimum threshold for Ec/No for UTRAN FDD cell re-selection,0= -20dB, 1= -6dB, 2= -18dB, 3= -8dB, 4= -16dB, 5= -10dB, 6= -14dB, 7= -12dB.De

18、fault value= -12dB.0-73BCCH D/LTable 1a: Parameters affecting cell priority for cell selectionCELL_BAR QUALIFYCELL_BAR ACCESSCell selectionpriorityStatus for cell reselection00normalnormal01barredbarred10lownormal (see note 2)11lownormal (see note 2)存在SDCCH切换，看小区那边是否这样设置了。切换完成后的短时间内得不到Cell ID和LAC，需等到切换完成后的System Information 6来才能取到Cell ID和LAC值。