eMTC网络系统广播消息研究

背景

LTE对于小区的公共配置参数通过系统广播消息发送给终端。终端在完成搜网和同步以后,下一步就是接收和解析系统广播消息。
系统广播消息分为MIB和SIB。MIB在BCH上发送,SIB在DL-SCH上发送。
eMTC是3GPP R13中为了增强对LTE - M的支持而引入的新的技术,也成为LTE CAT-M1。
国内目前没有eMTC商用网络,使用eMTC终端接入微戎WR100s测试系统,可以抓取信令消息进行分析。

MIB消息

MIB消息中以空闲的5bit携带schedulingInfoSIB1-BR-r13指示该小区是支持eMTC。以下是MIB消息的解析:

    dl-Bandwidth: n50 (3)
    phich-Config
        phich-Duration: normal (0)
        phich-Resource: one (2)
    systemFrameNumber: 2e [bit length 8, 0010 1110 decimal value 46]
    schedulingInfoSIB1-BR-r13: 16 PDSCH repetitions - TBS 208 bits (3)
    spare: 00 [bit length 5, 3 LSB pad bits, 0000 0... decimal value 0]

SIB1消息

eMTC相关的配置参数主要是 bandwidthReducedAccessRelatedInfo-r13

    c1: systemInformationBlockType1 (1)
        systemInformationBlockType1
            cellAccessRelatedInfo
                plmn-IdentityList: 1 item
                    Item 0
                        PLMN-IdentityInfo
                            plmn-Identity
                                mcc: 3 items
                                    Item 0
                                        MCC-MNC-Digit: 0
                                    Item 1
                                        MCC-MNC-Digit: 0
                                    Item 2
                                        MCC-MNC-Digit: 1
                                mnc: 2 items
                                    Item 0
                                        MCC-MNC-Digit: 0
                                    Item 1
                                        MCC-MNC-Digit: 1
                            cellReservedForOperatorUse: notReserved (1)
                trackingAreaCode: 0001 [bit length 16, 0000 0000  0000 0001 decimal value 1]
                cellIdentity: 1a2e0010 [bit length 28, 4 LSB pad bits, 0001 1010  0010 1110  0000 0000  0001 .... decimal value 27451393]
                cellBarred: notBarred (1)
                intraFreqReselection: allowed (0)
                .... ..0. csg-Indication: False
            cellSelectionInfo
                q-RxLevMin: -130dBm (-65)
            p-Max: 23dBm
            freqBandIndicator: 13
            schedulingInfoList: 1 item
                Item 0
                    SchedulingInfo
                        si-Periodicity: rf8 (0)
                        sib-MappingInfo: 0 items
            si-WindowLength: ms40 (6)
            systemInfoValueTag: 8
            nonCriticalExtension
                nonCriticalExtension
                    nonCriticalExtension
                        nonCriticalExtension
                            cellAccessRelatedInfo-v1250
                            nonCriticalExtension
                                bandwidthReducedAccessRelatedInfo-r13
                                    si-WindowLength-BR-r13: ms80 (3)
                                    si-RepetitionPattern-r13: everyRF (0)
                                    schedulingInfoList-BR-r13: 1 item
                                        Item 0
                                            SchedulingInfo-BR-r13
                                                si-Narrowband-r13: 2
                                                si-TBS-r13: b408 (4)
                                    startSymbolBR-r13: 3
                                    si-HoppingConfigCommon-r13: off (1)

SIB2消息

SIB2消息中最关键的是mpdcch的参数配置,这是eMTC引入的新的信道。

   c1: systemInformation (0)
        systemInformation
            criticalExtensions: systemInformation-r8 (0)
                systemInformation-r8
                    sib-TypeAndInfo: 1 item
                        Item 0
                            sib-TypeAndInfo item: sib2 (0)
                                sib2
                                    radioResourceConfigCommon
                                        rach-ConfigCommon
                                            preambleInfo
                                                numberOfRA-Preambles: n52 (12)
                                            powerRampingParameters
                                                powerRampingStep: dB2 (1)
                                                preambleInitialReceivedTargetPower: dBm-104 (8)
                                            ra-SupervisionInfo
                                                preambleTransMax: n10 (6)
                                                ra-ResponseWindowSize: sf10 (7)
                                                mac-ContentionResolutionTimer: sf40 (4)
                                            maxHARQ-Msg3Tx: 5
                                            preambleTransMax-CE-r13: n200 (10)
                                            rach-CE-LevelInfoList-r13: 1 item
                                                Item 0
                                                    RACH-CE-LevelInfo-r13
                                                        preambleMappingInfo-r13
                                                            firstPreamble-r13: 0
                                                            lastPreamble-r13: 52
                                                        ra-ResponseWindowSize-r13: sf50 (1)
                                                        mac-ContentionResolutionTimer-r13: sf100 (1)
                                                        rar-HoppingConfig-r13: off (1)
                                        bcch-Config
                                            modificationPeriodCoeff: n4 (1)
                                        pcch-Config
                                            defaultPagingCycle: rf128 (2)
                                            nB: oneT (2)
                                        prach-Config
                                            rootSequenceIndex: 98
                                            prach-ConfigInfo
                                                prach-ConfigIndex: 3
                                                ..0. .... highSpeedFlag: False
                                                zeroCorrelationZoneConfig: 12
                                                prach-FreqOffset: 2
                                        pdsch-ConfigCommon
                                            referenceSignalPower: -8dBm
                                            p-b: 1
                                        pusch-ConfigCommon
                                            pusch-ConfigBasic
                                                n-SB: 1
                                                hoppingMode: interSubFrame (0)
                                                pusch-HoppingOffset: 8
                                                .0.. .... enable64QAM: False
                                            ul-ReferenceSignalsPUSCH
                                                ..0. .... groupHoppingEnabled: False
                                                groupAssignmentPUSCH: 0
                                                0... .... sequenceHoppingEnabled: False
                                                cyclicShift: 0
                                        pucch-ConfigCommon
                                            deltaPUCCH-Shift: ds2 (1)
                                            nRB-CQI: 4
                                            nCS-AN: 0
                                            n1PUCCH-AN: 12
                                        soundingRS-UL-ConfigCommon: setup (1)
                                            setup
                                                srs-BandwidthConfig: bw0 (0)
                                                srs-SubframeConfig: sc0 (0)
                                                .... 1... ackNackSRS-SimultaneousTransmission: True
                                        uplinkPowerControlCommon
                                            p0-NominalPUSCH: -85dBm
                                            alpha: al07 (4)
                                            p0-NominalPUCCH: -110dBm
                                            deltaFList-PUCCH
                                                deltaF-PUCCH-Format1: deltaF0 (1)
                                                deltaF-PUCCH-Format1b: deltaF3 (1)
                                                deltaF-PUCCH-Format2: deltaF1 (2)
                                                deltaF-PUCCH-Format2a: deltaF2 (2)
                                                deltaF-PUCCH-Format2b: deltaF2 (2)
                                            deltaPreambleMsg3: 8dB (4)
                                        ul-CyclicPrefixLength: len1 (0)
                                        bcch-Config-v1310
                                            modificationPeriodCoeff-v1310: n64 (0)
                                        pcch-Config-v1310
                                            paging-narrowBands-r13: 1
                                            mpdcch-NumRepetition-Paging-r13: r1 (0)
                                            nB-v1310: one64thT (0)
                                        pdsch-ConfigCommon-v1310
                                            pdsch-maxNumRepetitionCEmodeA-r13: r16 (0)
                                        pusch-ConfigCommon-v1310
                                            pusch-maxNumRepetitionCEmodeA-r13: r8 (0)
                                        prach-ConfigCommon-v1310
                                            rsrp-ThresholdsPrachInfoList-r13: 1 item
                                                Item 0
                                                    RSRP-Range: RSRP < -140dBm (0)
                                            mpdcch-startSF-CSS-RA-r13: fdd-r13 (0)
                                                fdd-r13: v1 (0)
                                            prach-ParametersListCE-r13: 1 item
                                                Item 0
                                                    PRACH-ParametersCE-r13
                                                        prach-ConfigIndex-r13: 3
                                                        prach-FreqOffset-r13: 2
                                                        prach-StartingSubframe-r13: sf2 (0)
                                                        maxNumPreambleAttemptCE-r13: n3 (0)
                                                        numRepetitionPerPreambleAttempt-r13: n1 (0)
                                                        mpdcch-NarrowbandsToMonitor-r13: 1 item
                                                            Item 0
                                                                mpdcch-NarrowbandsToMonitor-r13 item: 1
                                                        mpdcch-NumRepetition-RA-r13: r1 (0)
                                                        prach-HoppingConfig-r13: off (1)
                                        pucch-ConfigCommon-v1310
                                            n1PUCCH-AN-InfoList-r13: 1 item
                                                Item 0
                                                    N1PUCCH-AN-InfoList-r13 item: 74
                                            pucch-NumRepetitionCE-Msg4-Level0-r13: n1 (0)
                                    ue-TimersAndConstants
                                        t300: ms200 (1)
                                        t301: ms200 (1)
                                        t310: ms200 (3)
                                        n310: n6 (4)
                                        t311: ms10000 (3)
                                        n311: n5 (4)
                                        t300-v1310: ms5000 (4)
                                        t301-v1310: ms5000 (4)
                                    freqInfo
                                        additionalSpectrumEmission: 1
                                    timeAlignmentTimerCommon: infinity (7)

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