在5G（NR）網(wǎng)絡(luò)中當(dāng)終端需要進(jìn)行上行數(shù)據(jù)傳輸時，其需要向網(wǎng)絡(luò)側(cè)的gNB申請資源和上行資源的調(diào)度；其原理與LTE網(wǎng)絡(luò)相同，其詳細(xì)內(nèi)容如下：  整理:kangguoying20200723

1.SR(調(diào)度請求)用途  整理:kangguoying20200723

        調(diào)度請求SR(Scheduling Request)是物理層一種特殊消息，用于UE向網(wǎng)絡(luò)請求發(fā)送UL調(diào)度授權(quán)(DCI Format 0_0 /0_1) ，以便UE能夠在PUSC信道上傳輸數(shù)據(jù)。 換句話說，SR是從UE到網(wǎng)絡(luò)的上行物理層消息，表示“我有些數(shù)據(jù)要發(fā)送給你。能給我一些資源，讓我發(fā)送數(shù)據(jù)好嗎”？  整理:kangguoying20200723

2. SR(調(diào)度請求)發(fā)送  整理:kangguoying20200723

        UE怎么發(fā)送SR消息？UE通過PUCCH (或通過PUSCH中的UCI) 發(fā)送。不是所有PUCCH格式都可以攜帶SR，有些PUCCH格式可以攜帶，有些則不能。 UE使用某種PUCCH格式根據(jù)情況發(fā)送SR(具體請參閱PUCCH格式頁)。 

SR在物理層的另一個含義是，你不能用RRC/NAS ASN解碼器來解碼。  整理:kangguoying20200723

        許多eNB或測試設(shè)備可以讓你將其日志轉(zhuǎn)換成 wireshark 文件；但是除非設(shè)備供應(yīng)商提供具體的 wireshark 分隔符，否則很可能你不會在 wireshark 中看到SR消息。 通常這些設(shè)備供應(yīng)商提供自己的日志查看器這種低層消息。  整理:kangguoying20200723

3.SR(調(diào)度消息)控制  整理:kangguoying20200723

       誰來控制SR過程呢？ 盡管SR消息是一種物理層消息，但它是由MAC層來進(jìn)行控制的（與許多其他物理層信道是由MAC層控制相同 )，SR進(jìn)程(何時發(fā)送)也是由MAC層控制的(詳見38.3215.4.4)，其過程如下圖所示。  整理:kangguoying20200723

4.RRC層的相關(guān)參數(shù)

        SchedulingRequestConfig ::= SEQUENCE {  整理:kangguoying20200723

            schedulingRequestToAddModList   SEQUENCE (SIZE 1..maxNrofSR-ConfigPerCellGroup)) OF   SchedulingRequestToAddMod  OPTIONAL,  整理:kangguoying20200723

            schedulingRequestToReleaseList     SEQUENCE (SIZE (1..maxNrofSR-ConfigPerCellGroup)) OF SchedulingRequestId  OPTIONAL -- Need N}   整理:kangguoying20200723

        SchedulingRequestToAddMod ::= SEQUENCE {  整理:kangguoying20200723

            schedulingRequestId                 SchedulingRequestId,  整理:kangguoying20200723

            sr-ProhibitTimer ENUMERATED {ms1, ms2, ms4, ms8, ms16,   ms32, ms64, ms128}

            sr-TransMax   ENUMERATED {n4, n8, n16, n32, n64,  spare3, spare2, spare1}}   

        schedulingRequestId : Used to modify a SR configuration and to indicate, in LogicalChannelConfig, the SR configuration to which a logical channel is mapped and to indicate, in SchedulingRequestresourceConfig, the SR configuration for which a scheduling request resource is used.  整理:kangguoying20200723  整理:kangguoying20200723 

        sr-ProhibitTimer : Timer for SR transmission in ms on PUCCH 

        sr-TransMax : Maximum number of SR transmissions  

        LogicalChannelConfig ::= SEQUENCE {  整理:kangguoying20200723

            ul-SpecificParameters   SEQUENCE {

                priority INTEGER (1..16),  整理:kangguoying20200723

                prioritisedBitRate   ENUMERATED {kBps0, kBps8, kBps16, kBps32,  kBps64, kBps128,   整理:kangguoying20200723kBps256,kBps512,  kBps1024, kBps2048, kBps4096,   kBps8192, kBps16384, kBps32768, kBps65536, infinity},

                bucketSizeDuration  ENUMERATED {ms5, ms10, ms20, ms50, ms100, ms150, ms300, ms500, ms1000, spare7, spare6, spare5, spare4, spare3,spare2, spare1},  整理:kangguoying20200723

                allowedServingCells  整理:kangguoying20200723

        SEQUENCE (SIZE (1..maxNrofServingCells-1)) OF   ServCellIndex  OPTIONAL,

                allowedSCS-List SEQUENCE (SIZE (1..maxSCSs)) OF SubcarrierSpacing  整理:kangguoying20200723

                maxPUSCH-Duration ENUMERATED {ms0p02, ms0p04, ms0p0625, ms0p125, ms0p25, ms0p5, spare2, spare1}

                configuredGrantType1Allowed             ENUMERATED {true} OPTIONAL,  整理:kangguoying20200723

                logicalChannelGroup        INTEGER (0..maxLCG-ID) OPTIONAL, -- Need R

                schedulingRequestID         SchedulingRequestId OPTIONAL, -- Need R  整理:kangguoying20200723

                logicalChannelSR-Mask                   BOOLEAN,  整理:kangguoying20200723

                logicalChannelSR-DelayTimerApplied      BOOLEAN,        ...,

                bitRateQueryProhibitTimer ENUMERATED { s0, s0dot4, s0dot8, s1dot6, s3, s6, s12,s30} OPTIONAL -- Need R } OPTIONAL, -- Cond UL...}   整理:kangguoying20200723

        logicalChannelSR-Mask : Controls SR triggering when a configured uplink grant of type1 or type2 is configured. true indicates that SR masking is configured for this logical channel   整理:kangguoying20200723

        logicalChannelSR-DelayTimerApplied : Indicates whether to apply the delay timer for SR transmission for this logical channel. Set to false if logicalChannelSR-DelayTimer is not included in BSR-Config.

原文來自：[url]http://www.sharetechnote.com/[/url]  整理:kangguoying20200723