正如LTE，在5G(NR)中一個(gè)大的傳輸塊(TB-Transport Block )也被分成多個(gè)碼塊(CBs-Code Block )。然而與LTE不同的是，5G(NR)新增了數(shù)據(jù)單位-碼塊組（CBG-Code Block Group），它由多個(gè)CBs (Code Block)組成；5G(NR)網(wǎng)絡(luò)的ACK/NACK和數(shù)據(jù)重傳都是以碼塊組（CBG）為單位；CBG是在DCI(Format 0_1, Format 1_1)指示；整理：kangguoying20200820

1.傳輸塊（TB）結(jié)構(gòu)

        一個(gè)傳輸塊（TB）由多個(gè)碼塊組（CBG）構(gòu)成，一個(gè)碼塊組（CBG）由多個(gè)CB組成，結(jié)構(gòu)如下：整理：kangguoying20200820

2.傳輸塊（TB）特殊結(jié)構(gòu)

       一個(gè)傳輸塊（TB）僅由一個(gè)碼塊組（CBG）構(gòu)成，這種情況比較少見。整理：kangguoying20200820

3.RRC消息中CBG

       PDSCH-ServingCellConfig ::= SEQUENCE {整理：kangguoying20200820

          codeBlockGroupTransmission        SetupRelease { PDSCH-CodeBlockGroupTransmission } OPTIONAL,

          xOverhead                         ENUMERATED { xOh6, xOh12, xOh18 } OPTIONAL, -- Need S

          nrofHARQ-ProcessesForPDSCH        ENUMERATED {n2, n4, n6, n10, n12, n16} OPTIONAL, -- Need S

          pucch-Cell                        ServCellIndex OPTIONAL , -- Cond

          SCellAddOnly   ...} 整理：kangguoying20200820

       PDSCH-CodeBlockGroupTransmission ::= SEQUENCE {整理：kangguoying20200820

           maxCodeBlockGroupsPerTransportBlock        ENUMERATED {n2, n4, n6, n8},

           codeBlockGroupFlushIndicator               BOOLEAN,    ...}整理：kangguoying20200820

原文來(lái)自：http://www.sharetechnote.com/ 整理：kangguoying20200820

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