WCDMA BCCH广播信息.doc

BCCH广播信息学习报告1. 系统信息的组织结构系统信息是包含在系统信息块（SIB）里被广播的。SIB是具有相同属性的一组信息元素的集合。不同的SIB块通常包含不同的内容。系统信息是以树状结构被组织的。根节点是主信息块（MIB, Master Information Block）。和SIB不同，MIB里主要包含了具体SIB块的参考和调度信息，而具体的系统信息是放在SIB里的。MIB里有时候也会包含有1或2个调度块（scheduling block）的参考和调度信息，调度块的作用也是给出SIB的参考和调度信息。所以，SIB的调度信息可以包含在MIB里，也可以包含在调度块里。2. SIB的作用范围每个SIB都有其生效的范围（比如说在一个小区内生效，或在一个PLMN里生效），并且调度信息也不同。下面这张表给出了系统信息里所有信息块的约束信息。其中Area scope这一列给出了信息块的作用范围，UE mode/state when block is valid指出了当手机处于哪些状态下信息块是生效的，UE mode/state when block is read指出了当手机处于哪些状态下可以读取该信息块，Scheduling information给出了每个信息快的出现位置和接收周期。Modification of system information指出了信息块的更新机制。有的信息块携带有值标签（value tag），当手机发现值标签和自己存储的值标签不一致时，更新存储的信息块内容；有的信息块携带有一个定时器，当定时器过期时，手机更新存储的信息块内容。Table 8.1.1: Specification of system information block characteristicsSystem information blockArea scopeUE mode/state when block is validUE mode/state when block is readScheduling informationModification of system informationAdditional commentMaster information blockCellIdle mode,CELL_FACH,CELL_PCH, URA_PCHIdle mode,CELL_FACH,CELL_PCH, URA_PCH SIB_POS = 0SIB_REP = 8 (FDD) SIB_REP = 8, 16, 32 (TDD)SIB_OFF=2 Value tagScheduling block 1CellIdle mode,CELL_FACH,CELL_PCH, URA_PCHIdle mode,CELL_FACH,CELL_PCH, URA_PCHSpecified by the IE Scheduling information in MIBValue tagScheduling block 2CellIdle mode,CELL_FACH,CELL_PCH, URA_PCHIdle mode,CELL_FACH,CELL_PCH, URA_PCHSpecified by the IE Scheduling information in MIBValue tagSystem information block type 1PLMNIdle modeCELL_FACH,CELL_PCH, URA_PCH,CELL_DCHIdle, CELL_FACH,CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 2CellURA_PCHURA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 3CellIdle mode, (CELL_FACH, CELL_PCH, URA_PCH)Idle mode, (CELL_FACH, CELL_PCH, URA_PCH)Specified by the IE Scheduling informationValue tagSystem information block type 4CellCELL_FACH, CELL_PCH, URA_PCHCELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagIf System information block type 4 is not broadcast in a cell, the connected mode UE shall apply information in System information block type 3 in connected mode.System information block type 5CellIdle mode, (CELL_FACH, CELL_PCH, URA_PCH, CELL_DCH (TDD only)Idle mode, (CELL_FACH, CELL_PCH, URA_PCH, CELL_DCH (TDD only)Specified by the IE Scheduling informationValue tagSystem information block type 6CellCELL_FACH, CELL_PCH, URA_PCH, CELL_DCH (TDD only)CELL_FACH, CELL_PCH, URA_PCH, CELL_DCH (TDD only)Specified by the IE Scheduling informationValue tagIf system information block type 6 is not broadcast in a cell, the connected mode UE shall read System information block type 5.If some of the optional IEs are not included in System information block type 6, the UE shall read the corresponding IEs in System information block type 5In TDD mode system information block 6 shall only be read in CELL_DCH if required for open loop power control as specified in subclause 8.5.7 and/or if shared transport channels are assigned to the UE. If in these cases system information block type 6 is not broadcast the UE shall read system information block type 5.System information block type 7CellIdle mode, CELL_FACH, CELL_PCH, URA_PCH, CELL_DCH (TDD only)Idle mode, CELL_FACH, CELL_PCH, URA_PCH, CELL_DCH (TDD only)Specified by the IE Scheduling informationExpiration timer = MAX(32 , SIB_REP * ExpirationTimeFactor)In TDD mode system information block type 7 shall only be read in CELL_DCH if shared transport channels are assigned to the UE.System information block type 8CellCELL_FACH, CELL_PCH, URA_PCHCELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 9CellCELL_FACH, CELL_PCH, URA_PCHCELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationExpiration timer = SIB_REPSystem information block type 10CellCELL_DCHCELL_DCHSpecified by the IE Scheduling informationExpiration timer = SIB_REPSystem information block type 11CellIdle mode (CELL_FACH, CELL_PCH, URA_PCH, CELL_DCH)Idle mode (CELL_FACH, CELL_PCH, URA_PCH)Specified by the IE Scheduling informationValue tagSystem information block type 12CellCELL_FACH, CELL_PCH, URA_PCH, CELL_DCHCELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagIf system information block type 12 is not broadcast in a cell, the connected mode UE shall read System information block type 11.If some of the optional IEs are not included in System information block type 12, the UE shall read the corresponding IEs in System information block type 11.System information block type 13CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 13.1CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 13.2CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 13.3CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 13.4CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 14CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCH, CELL_DCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCH, CELL_DCHSpecified by the IE Scheduling informationExpiration timer = MAX(32 , SIB_REP * ExpirationTimeFactor)This system information block is used in 3.84 Mcps TDD mode only.System information block type 14 shall only be read in CELL_DCH if required for open loop power control as specified in subclause 8.5.7.System information block type 15CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 15.1CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 15.2CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagFor this system information block there may be multiple occurrencesSystem information block type 15.3PLMNIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagFor this system information block there may be multiple occurrencesSystem information block type 15.4CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 15.5CellIdle Mode, CELL_FACH, CELL_PCH, URA_PCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagSystem information block type 16Equivalent PLMNIdle Mode, CELL_FACH, CELL_PCH, URA_PCH, CELL_DCHIdle Mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagFor this system information block there may be multiple occurrences. This system information block is also valid while in GSM/GPRS.System information block type 17CellCELL_FACH, CELL_PCH, URA_PCH, CELL_DCHCELL_FACH, CELL_PCH, URA_PCH, CELL_DCHSpecified by the IE Scheduling informationExpiration timer = SIB_REPThis system information block is used in TDD mode only.System information block type 17 shall only be read if shared transport channels are assigned to the UE.System Information Block type 18CellIdle mode, CELL_FACH, CELL_PCH, URA_PCH, CELL_DCHIdle mode, CELL_FACH, CELL_PCH, URA_PCHSpecified by the IE Scheduling informationValue tagThe UE shall acquire all system information blocks except system information block type 10 on BCH. System Information Block type 10 shall be acquired on the FACH and only by UEs with support for simultaneous reception of one SCCPCH and one DPCH. If System Information Block type 10 is not broadcast in a cell, the DRAC procedures do not apply in this cell. System Information Block type 10 is used in FDD mode only.3. 系统信息的分段和级联由于SYSTEM INFORMATION消息的长度是有限制的，有的信息块过长，不能在一个系统信息消息里传完，因此需要将它进行分段；多个SIB的分段也可以级联在一起，放在一个系统信息消息里传输。这些操作都是由RRC层完成的。3gpp定义了四种分段类型（segment type）：-First segment;-Subsequent segment;-Last segment;-Complete.每个分段都由header和data域组成。其中header包含以下参数：-SEG_COUNT：系统信息块的分段数，只在First segment类型的分段中包含.-SIB type.：信息块类型，指定该信息块是MIB，调度块，还是SIB-Segment index：分段序号，只在Subsequent segment和Last segment类型的分段中包含系统信息消息是由这四种分段的组合构成的。共有以下几种组合方式：1.No segment;2.First segment;3.Subsequent segment;4.Last segment;5.Last segment + First segment;6.Last segment + one or several Complete;7.Last segment + one or several Complete + First segment;8.One or several Complete;9.One or several Complete + First segment;10.One Complete of size 215 to 226;11.Last segment of size 215 to 222.4. SIB调度信息SIB调度信息描述了SIB在什么位置出现，以及以怎样的周期出现等内容。由于SIB可能被分段，因此SIB调度信息里还包含了分段的调度信息。SIB调度信息主要包含以下参数：SEG_COUNT：分段数SIB_REP：SIB的重复接收周期，一个SIB里的所有分段均相同SIB_POS(i)：每个分段的出现位置（基于小区的系统帧号SFN）SIB_OFF(i)：后一个分段相对与前一个分段的偏置后续分段的位置计算公式为：SIB_POS(i) = SIB_POS(i-1) + SIB_OFF(i)每个分段都有一个系统帧号，系统帧号与SIB_REP和SIB_POS(i)的关系为：SFN mod SIB_REP = SIB_POS(i)5. 系统信息消息下面给出系统信息消息里各字段的解释 Message type 消息类别，如果系统信息消息在FACH上发送，则必须包含此字段SFN prime 用于计算系统帧号：SFN=SFNprime (for first 10ms frame of 20ms TTI), SFN=SFNprime+1 (for last 10ms frame of 20ms TTI)如果系统信息消息在FACH上发送，则必须包含此字段Segment combination 分段组合类型，共11种，参见第3节，一个系统信息消息只能采用一种组合方式 Combination 1无数据 Combination 2包含First segmentFirst segment SIB type指定SIB类型，枚举类型字段 SEG_COUNT分段数目，取值范围116 SIB data fixed SIB数据，用于固定长度的分段，222个比特 Combination 3包含Subsequent segmentSubsequent segment SIB type同上 Segment Index分段序号，取值范围115 SIB data fixed 同上 Combination 4包含Last segment(short)Last segment(short) SIB type同上 Segment Index同上 SIB data variable SIB数据，长度可变，包含1214个比特 Combination 5包含Last segment(short) + First segment(short)Last segment(short) 同上First segment(short) SIB type同上 SEG_COUNT同上 SIB data variable 同上 Combination 6包含Last segment(short) + 一个或多个Complete(short)Last segment(short) 同上Complete listComplete SIB (short) 同上 SIB type同上 SIB data variable 同上 Combination 7包含Last segment(short) + 一个或多个Complete + First segment(short);Last segment(short) 同上Complete listComplete SIB (short) 同上First segment(short) 同上 Combination 8包含一个或多个CompleteComplete listComplete SIB (short) 同上 Combination 9包含一个或多个Complete + First segment;Complete listComplete SIB (short) 同上First segment(short) 同上 Combination 10包含One Complete of size 215 to 226Complete SIB of size 215 to 226 SIB type指定SIB类型，枚举类型字段 SIB data fixed SIB数据，固定226个比特，数据不够时用填充比特 Combination 11包含Last segment of size 215 to 222Last segment of size 215 to 222 SIB type同上 Segment Index同上 SIB data fixed 固定222个比特，数据不够时用填充比特6. 系统信息块6.1. MIB MIB Value tag 值标签，取值范围18 Supported PLMN types PLMN类型，枚举数据类型(GSM-MAP, ANSI-41, GSM-MAP and ANSI-41) PLMN identity MCC = 460移动国家代码 MNC = 13 移动网络代码 References to other system information blocks and scheduling blocks其他SIB和调度块的索引（多个） References to other system information blocks Scheduling informationValue tag值标签，可选项，在以下四项中选其一PLMN Value tag当SIB1时使用Predefined configuration identity and value tag当SIB16时使用Cell Value tag当SIB的作用域为CELL时使用SIB occurrence identity and value tag当SIB15.2和SIB15.3时使用 Scheduling SEG_COUNT分段数目SIB_REP SIB的接收周期，取值Integer (4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096)，单位frame SIB_POS 第一个分段的出现位置SIB_POS offset infoSIB_OFF后续分段的偏置，取值Integer(2.32 by step of 2) SIB and SB type信息块类型，枚举类型数据6.2. 调度块1References to other system information blocks其他SIB和索引（多个）Scheduling information同上SIB type SIBs only信息块类型，枚举类型数据6.3. 调度块2同6.26.4. SIB1包含非接入层信息，及UE在空闲和连接状态下的定时器信息。CN common GSM-MAP NAS system information 八位字节CN domain system information listCN域信息，多个CN domain system information CN domain identity CN域标识，Enumerated (CS domain, PS domain) CN TypeCN类型，在下面两项中选其一 GSM-MAP CN domain specific NAS system information 八位字节 ANSI-41 CN domain specific NAS system information CN domain specific DRX cycle length coefficient 计算寻呼间隔的系数，取值Integer(6.9)UE Timers and constants in idle modeT300UE 发送RRC CONNECTION SETUP REQUEST消息后的等待时间，msN300RRC CONNECTION SETUP REQUEST消息的最大重传次数T312UE开始专用物理信道建立时等待L1的同步指示的时间，sN312UE在专用信道建立成功前应从L1连续收到的同步指示的数目UE Timers and constants in connected modeT301目前版本未用 N301目前版本未用 T302 UE发送CELL/URA UPDATE消息后的等待时间，ms N302CELL/URA UPDATE消息的最大重传次数 T304 UE发送UE CAPABILITY INFORMATION消息后的等待时间，msN304 UE CAPABILITY INFORMATION消息的最大重传次数 T305 UE在CELL_FACH/CELL-PCH/URA_PCH状态下周期性小区/URA更新的周期长度，min T307 UE脱离服务区后等待进行小区重选的时间，sT308 CELL_DCH状态下发送RRC CONNECTION RELEASE COMPLETE消息后的等待时间，msN308RRC CONNECTION RELEASE COMPLETE消息的最大重传次数T309 启动与其它RAT（如GSM）接入请求后的等待时间，sT310 发送PUSCH CAPACITY REQUEST后的等待时间，msN310 PUSCH CAPACITY REQUEST的最大重传次数T311UE收到PHYSICAL SHARED CHANNEL ALLOCATION消息后等待PUSCH allocation assignment的时间，msT312UE开始专用物理信道建立时等待L1的同步指示的时间，s N312 UE在专用信道建立成功前应从L1连续收到的同步指示的数目 T313CELL_DCH状态已建立的DPCCH信道失去同步后的等待时间，s N313UE从L1连续收到的失步指示的数目 T314无线连接失败，与T314相关的无线承载存在等待小区更新完成的时间，s T315无线连接失败，与T315相关的无线承载存在等待小区更新完成的时间，s N315 在T313激活状态下，UE从L1连续收到的同步指示的最大数目 T316在CELL_PCH/URA_PCH状态脱离服务区后等待小区选择/重选的时间，s T317 在CELL_FACH状态脱离服务区后等待进行小区选择/重选的时间，不会过时6.5. SIB2主要包含URA标识。URA identity listURA标识列表，可以有多个URA identityURA标识，16位字符串6.6. SIB3包含小区选择和重选参数SIB4 Indicator指示SIB4是否在小区里广播Cell Identity 小区标识，28位字符串Cell selection and re-selection infoMapping Info可选项，不发送Cell selection and reselection quality measure 质量测量的测量量，枚举类型(CPICH Ec/N0, CPICH RSCP)CHOICE MODE 根据模式选择相应参数FDD Sintrasearch 频内测量门限，可选，Integer (-32.20 by step of 2) Sintersearch频间测量门限，可选，Integer (-32.20 by step of 2)SsearchhcsHCS测量门限，可选，Integer (-105.91 by step of 2)RAT List可选，可有多个RATRAT identifier枚举类型(GSM, cdma2000)Ssearch,RATInteger (-32.20 by step of 2)SHCS,RAT可选，Integer (-105.91 by step of 2)Slimit,SearchRATInteger (-32.20 by step of 2) Qqualmin小区选择的Ec/No最小值Qrxlevmin 小区选择的RSCP最小值DeltaQrxlevmin当Qrxlevmin小于115dbm时，需要此参数TDD此模式不使用，因此不在本文列举Qhyst1sInteger (0.40 by step of 2)Qhyst2s当测量量Ec/N0时需要此参数，Integer (0.40 by step of 2)Treselections 重选触发时间，Integer (0.31)Maximum allowed UL TX power最大允许上行发射功率HCS Serving cell Information可选项，没有HCS时不需要HCS_PRIOQhcsTCRmaxNCR当未使用TCRmax时不需要TCrmaxHyst当未使用TCRmax时不需要Cell Access Restriction小区访问限制Cell Barred小区是否禁止访问Intra-frequency cell re-selection indicator当小区禁止访问时需要此参数Tbarred当小区禁止访问时需要此参数Cell Reserved for operator use枚举类新 (reserved, not reserved)Cell Reservation Extension枚举类新 (reserved, not reserved)Access Class Barred listAccess Class Barred枚举类型(not barred, barred)6.7. SIB4SIB4里也是包含小区选择和重选参数，在连接模式下使用。包含参数基本上和SIB3一样。6.8. SIB5包含公共物理信道的配置信息。SIB6 Indicator 指示SIB6是否在小区里广播PICH Power offset PICH信道功率偏置CHOICE mode 根据模式选择相应参数FDD AICH Power offset AICH功率偏置TDD此模式不使用，因此不在本文列举Primary CCPCH info 主公共控制物理信道信息 CHOICE modeFDD TX Diversity indicator指示是否使用发射分集TDDPRACH system information list可以有多条PRACHPRACH system informationPRACH info CHOICE mode FDD Available Signature 16位字符串 Available SF 指示最小可用扩频码Preamble sc