System Information Blocks (SIBs) in LTE. Михаил Якимов

Transcription

1 System Information Blocks (SIBs) in LTE Михаил Якимов

2 SIB 1 - cell access and scheduling of other system information (1) PLMN-Identity p-max cellreservedforoperatoruse trackingareacode cellidentity cellbarred intrafreqreselection q_rxlevmin q_rxlevminoffset Consists of MCC and MNC. The first listed one is the Primary PLMN Value applicable for the cell. If absent the UE applies the maximum power according to the UE capability. If enb configures the value more than the value supported by the UE then UE will set the max value aupported by the UE capability. Example UE Catagory 3 supports max 23 db As defined by operator (Reserved/Not_reserved) TAC which is common to the PLMN Identities Identifies a cell within the PLMN If Barred then UE is not allowed to camp on the cell If enabled, UE will be able to perform Cell-reselection to INTRA-frequency cells Minimum required RX level in the cell Actual value Q rxlevminoffset = IE value * 2 [db]. only applied when a cell is evaluated for cell selection as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN [5]. During this periodic search for higher priority PLMN the UE may check the S criteria of a cell using parameter values stored from a different cell of this higher priority PLMN. Affects the minimum required Rx level in the cell.

3 SIB 1 (2) freqbandindicator schedulinginfolist si_periodicity sib_mappinginfo si_windowlength systeminfovaluetag indicates the E-UTRA operating band information regarding the presence of SIB type; other than SIB1 Periodicity of the SI-message in radio frames (SI will be transmitted within the specified radio frame) carries the List of the SIBs mapped. SIB2 is always present in the first element of schedulinginfolist specifies that a SIB should be transmitted somewhere within the specified window length. Value is in ms. This window starts at the starting sub-frame of the mentioned si_periodicity. SIBs can be received in any of the sub-frame as mentioned in the WindowLength. indicates if a change has occurred in the SI messages. UEs may use systeminfovaluetag, e.g. upon return from out of coverage, to verify if the previously stored SI messages are still valid. Additionally, the UE considers stored system information to be invalid after 3 hours from the moment it was successfully confirmed as valid, unless specified otherwise. Common for all SIBs other than MIB, SIB1, SIB10, SIB11 and SIB12.

4 SIB 2 - radio resource configuration information (1) ac-barringinfo radioresourceconfig numberofra_preambles preamblesgroupaconfig_exist powerrampingparameters powerrampingstep preambleinitialreceivedtargetpower Access Class Barring configuration used to specify common radio resource configurations in the system information and in the mobility control information Number of non-dedicated random access preambles Provides the configuration for preamble grouping. If the field is not signalled, the size of the random access preambles group A is equal to numberofra-preambles Power ramping factor Initial preamble power ra_supervisioninfo preambletransmax ra_responsewindowsize mac_contentionresolutiontimer maxharq_msg3tx 4 Maximum number of preamble transmission Duration of the RA response window. Value in subframes. Value sf2 corresponds to 2 subframes Timer for contention resolution. Value in subframes. Value sf8 corresponds to 8 subframes Maximum number of Msg3 HARQ transmissions, used for contention based random access

5 SIB 2 (2) bcch_config modificationperiodcoeff pcch_config defaultpagingcycle nb prach_config rootsequenceindex prach_configindex highspeedflag zerocorrelationzoneconfig Actual modification period, expressed in number of radio frames= modificationperiodcoeff * defaultpagingcycle. n2 corresponds to value 2 Default paging cycle, used to derive T. Value rf32 corresponds to 32 radio frames is used as one of parameters to derive the Paging Frame and Paging Occasion used to specify the PRACH configuration in the system information and in the mobility control information mentions the: Preamble format: 0-4 (For frame structure 1 preamble format is 0-3 and for frame structure 2 it is 0-4) SFN: whether it will be EVEN no. frmae OR any frame subframe number: carrier the subframe no. within the SFN (Look for the table in TS Table ) TRUE corresponds to Restricted set and FALSE to Unrestricted set used for Preamble generation

6 SIB 2 (3) pdsch_config pusch_config pucch_config used to specify the common and the UE specific PDSCH configuration used to specify the common PUSCH configuration and the reference signal configuration for PUSCH and PUCCH used to specify the common and the UE specific PUCCH configuration soundingrs_ul_config uplinkpowercontrol ue_timersandconstants used to specify the uplink Sounding RS configuration used to specify parameters for uplink power control in the system information and in the dedicated signalling Timer values freqinfo timealignmenttimercommon UL carrier frequency and bandwidth used to control how long the UE is considered uplink time aligned. Value in subframes

7 SIB3: Cell-reselection parameters for INTRA-Frequency, INTER-Frequency and Inter-RAT (1) cellreselectioninfocommon q_hyst speedstatereselectionpars cellreselectionservingfreqinfo s_nonintrasearch threshservinglow cellreselectionpriority Cell re-selection information common for cells This specifies the hysteresis value for cell re-selection ranking criteria. The specified value is added to the serving cell RSRP measurement. Speed dependent reselection parameters. If this field is absent then mobility State Parameters is not present. If q_hystsf is present then it is added to q_hyst. Carrier (- ) value so as to reduce the ranking of the serving cell and allows cellreselection to occur easily. Information for Cell re-selection to inter-frequency and inter-rat cells #used to trigger Interfrequency and IRATfrequency measurements for cell reselection when: - TARGET Interfreq. has lower or equal priority - IRAT freq. has a lower priority # specifies the Srxlev threshold (in db) for E-UTRAN inter-frequency and inter-rat measurements. #If the field s-nonintrasearchp is present, the UE applies the value of s- NonIntraSearchP. # Otherwise if neither s-nonintrasearch nor s-nonintrasearchp is present, the UE applies the (default) value of infinity for SnonIntraSearchP. This specifies the Srxlev threshold (in db) below which the serving cell must fall before reselecting towards a lower priority RAT/ frequency. Value in between 0-31dB. Actual value=signalled value*2 explains the absolute priority of the concerned serving cell frequency /set of frequencies (GERAN)/ bandclass (CDMA2000), as used by the cell reselection procedure. Corresponds with parameter "priority". Value is between 0-7 where 0 means: lowest priority.

8 SIB3 (2) intrafreqcellreselectionin Cell re-selection information common for intra-frequency cells fo Minimum required RSRP for cell reselection. value dbm, Actual q_rxlevmin value=signalled value*2 # used to trigger intrafreq. measurements # specifies the Srxlev threshold (in db) for intra-frequency measurements. # If the field s-intrasearchp is present, the UE applies the value of s- s_intrasearch IntraSearchP instead. Otherwise if neither 09s-IntraSearch nor s- IntraSearchP is present, the UE applies the (default) value of infinity for SIntraSearchP. is used to09 indicate whether all the neighbouring cells use 09Antenna Port presenceantennaport1 1. When set to TRUE, the UE may assume that at least two cell-specific antenna ports are used in all neighbouring cells. used to provide the information related to MBSFN and TDD UL/DL neighcellconfig configuration of neighbour cells. # specifies the cell reselection timer value t_reselectioneutra # defines time to trigger for cell reselection # The parameter can be set per E-UTRAN frequency # max. allowed UL transmit power for intra-frequency neighbouring E-UTRA p_max cells. If absent the UE applies the maximum power according to the UE capability

9 SIB4: Cell-reselection parameters for Neighbouring INTRA- Frequency intrafreqneighcelllist [1-16 instances] IntraFreqNeighCellInfo physcellid q-offsetcell intrafreqblackcelllist [1-16 instances] csg_physcellidrange intrafreqneighcelllist [1-16 instances] List of intra-frequency neighbouring cells with specific cell reselection parameters Physical CellID of the neighbour cell specifies the offset between the two cells. Value dB List of blacklisted intra-frequency neighbouring cells. These type of cells are not considered for cell re-selection Set of physical cell identities reserved for CSG cells on the frequency on which this field was received. The received csg- PhysCellIdRange applies if less than 24 hours has elapsed since it was received and it was received in the same primary PLMN. This field is Optional (mandatory for CSG cell) List of intra-frequency neighbouring cells with specific cell reselection parameters

10 SIB5: Cell-reselection parameters for INTER-Frequency InterFreqCarrierFreqInfo dl-carrierfreq q-rxlevmin p-max t-reselectioneutra t-reselectioneutra-sf threshx-high threshx-low allowedmeasbandwidth cellreselectionpriority neighcellconfig q-offsetfreq interfreqblackcelllist can be specified upto 8 carrier frequencies carrier frequency helps the UE to search the cells minimum RSRP value of the inter-frequency cell. Value -70 to -22 dbm. Actual value: signalled value * 2 maximum allowed UL transmit power of the cell defines the time to trigger for cell reselection. Value 0 to 7 sec. scaling factors for Medium and High mobility # Threshold (in db) used by UE for cell re-selection to a HIGHER priority # The Srxlev of the candiate cell is greater then threshx_high # Value 0 to 31 db. Actual value= Signaled value * 2 # Threshold (in db) used by UE for cell re-selection to a LOWER priority # Cell re-selection is allowed only when Srxlev of the candiate cell is greater then threshx_low and RSRP of serving cell is less than the value of ThreshServingLow singalled within SIB3 # Value 0 to 31 db. Actual value= Signaled value * 2 defined in terms of Resouce blocks associated with a specific channel bandwidth defines the Abolute priority of the frequency layer information regarding the neighbouring cells defines the RSRP measurement offset, applied to all cells on the specified RF carrier the mentioned cells are no considered for cell reselection

11 SIB6: Cell-reselection parameters INTER RAT Frequency carrierfreqlistutra_fdd/tdd carrierfreq cellreselectionpriority threshx_high threshx_low q_rxlevmin p_max q_qualmin t_reselectionutra t_reselectionutra_sf Information specified for up to 16 instances of RF carriers for FDD or TDD carrier frequency helps the UE to seach defines the absolute priority of the UMTS. Value 0-7, 0 is the lowest priority # Threshold (in db) used by UE for cell re-selection to a HIGHER priority UMTS frequency # The Srxlev of the candiate cell is greater then threshx_high # Value 0 to 31 db. Actual value= Signaled value * 2 # Threshold (in db) used by UE for cell re-selection to a LOWER priority UMTS frequency # Cell re-selection is allowed only when Srxlev of the candiate cell is greater then threshx_low and RSR of serving cell is less than the value of ThreshServingLow singalled within SIB3 # Value 0 to 31 db. Actual value= Signaled value * 2 minimum RSCP requirement for candiate UMTS cell. Value -60 to -13 db. Actual value= Signaled value * 2 +1 Value applicable for the intra-frequency neighbouring E-UTRA cells. If absent the UE applies the maximum power according to the UE capability # minimum Ec/Io requirement for candiate UMTS cell. Value -24 to 0 db # applicable for FDD only # defines the time to trigger cell re-selection # value 0-7 seconds # defines the time to trigger cell re-selection # value 0-7 seconds # Scaling factors used for Medium and High mobility # Scaling Factors value 0.25, 0.5, 0.75, 1.0. These values decrease the value of T_reselection which allows more rapid cell re-selections

12 SIB7: Cell-reselection parameters INTER RAT Frequency (GERAN) t_reselectiongeran carrierfreqsinfolist[0] carrierfreqs startingarfcn bandindicator followingarfcns Time to trigger for reselection. Value 0 to 7 sec. carries upto 16 instances of GERAN freq. Start of the ARFCN dcs1800 or pcs1900 ARFCN groups cellreselectionpriority ncc_permitted q_rxlevmin p_maxgeran threshx_high threshx_low absolute priority of the GERAN layer. Value 0 to 7, whereas 0 is the lowest priority Network Color Code. Is a bitmap value minimum RSSI value required maximum allowed UL transmit power # Threshold (in db) used by UE for cell re-selection to a HIGHER priority frequency # The Srxlev of the candiate cell is greater then threshx_high # Value 0 to 31 db. Actual value= Signaled value * 2 # Threshold (in db) used by UE for cell re-selection to a LOWER priority frequency # Cell re-selection is allowed only when Srxlev of the candiate cell is greater then threshx_low and RSRP of serving cell is less than the value of ThreshServingLow singalled within SIB3 # Value 0 to 31 db. Actual value= Signaled value * 2

13 SIB9: Home enb name hnb-name Carries the name of the home enb

14 SIB10: ETWS primary notification messageidentifier Identifies the source and type of ETWS notification (earthquake, tsunami warning, any emergency or test message) serialnumber Identifies variations of an ETWS notification. -uses various mechanisms to alert the user (display message, play a tone or vibrate, location where the message is applicable, also contains an update number which specifies whether a change is in the message content or not) warningtype warningsecurityinfo # Identifies the warning type of the ETWS primary notification (earthquake, tsunami, etc.) and # provides information on emergency user alert and UE popup # is optional, only applied when security is applied # Provides security information for the ETWS notification

15 SIB11: ETWS secondary notification messageidentifier serialnumber warningmessagesegmenttype [last/not last] warningmessagesegmentnumber warningmessagesegment datacodingscheme Identifies the source and type of ETWS notification (earthquake, tsunami warning, any emergency or test message) Identifies variations of an ETWS notification. -uses various mechanisms to alert the user (display message, play a tone or vibrate, location where the message is applicable, also contains an update number which specifies whether a change is in the message content or not) Indicates whether the included ETWS warning message segment is the last segment of the complete segment or not # allows oedering of the message segments # Segment number of the ETWS warning message segment contained in the SIB. A segment number of zero corresponds to the first segment, one corresponds to the second segment, and so on carries actual segment of the message Identifies the alphabet/coding and the language applied variations of an ETWS notification

16 SIB12: CMAS notification messageidentifier Identifies the source and type of CMAS notification serialnumber Identifies variations of a CMAS notification warningmessagesegmenttype warningmessagesegmentnumber warningmessagesegment datacodingscheme Indicates whether the included CMAS warning message segment is the last segment or not Segment number of the CMAS warning message segment contained in the SIB. A segment number of zero corresponds to the first segment, one corresponds to the second segment, and so on Carries a segment of the Warning Message Identifies the alphabet/coding and the language applied variations of a CMAS notification

17 SIB13: MBMS control information Contains the information required to acquire the MBMS control information associated with one or more MBSFN areas mbsfn-areainfolist