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  • DCI format 0/1 - [LTE MAC层]

    Tag：LTE DCI format

    2009-02-23

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    http://laomiao.blogbus.com/logs/35595537.html

    DCI Format 0    
     
    Information type Number of bits on PDCCH Purpose
    　 　 　
    Flag for format 0 / format 1A differentiation 1 Indicates DCI format to UE
    Hopping flag 1 Indicates whether uplink frequency hopping is used or not
    Resource block assignment and hopping resource allocation Depending on
    resource
    allocation type    		 Indicates whether to use type 1 or type 2 frequency hopping and index of starting resource block of uplink resource allocation as well as number of contiguously allocated resource blocks
    Modulation and coding scheme and redundancy version

    		 5 Indicates modulation scheme and, together with the number of allocated physical resource blocks, the transport block size
    Indicates redundancy version to use
    New data indicator 1 Indicates whether a new transmission shall be sent
    TPC command for scheduled PUSCH
    		 2 Transmit power control (TPC) command for adapting the  transmit power on the Physical Uplink Shared Channel (PUSCH)
    Cyclic shift for demodulation reference signal 3 Indicates the cyclic shift to use for deriving the uplink demodulation reference signal from the base sequence
    Uplink index (TDD only) 2 Indicates the uplink subframe where the scheduling grant has to be applied
    CQI request 1 Requests the UE to send a channel quality indication (CQI)
     
    DCI Format 1  
     
    Information type Number of bits on PDCCH Purpose
     
    Resource allocation header 1 Indicates whether resource allocation type 0 or 1 is used
    Resource block assignment Depending on resource allocation type Indicates resource blocks to be assigned to the UE
    Modulation and coding scheme 5 Indicates modulation scheme and, together with the number of allocated physical resource blocks, the transport block size
    HARQ process number 3 (TDD), 4 (FDD) Identifies the HARQ process the packet is associated with
    New data indicator  1 Indicates whether the packet is a new transmission or a retransmission
    Redundancy version 2 Identifies the redundancy version used for coding the packet
    TPC command for PUCCH 2 Transmit power control (TPC) command for adapting the transmit power on the Physical Uplink Control Channel (PUCCH)
    Downlink assignment index (TDD only) 2 number of downlink subframes for uplink ACK/NACK bundling
         

    随机文章：

    理解HARQ 2009-04-29
    LTE UE attach 2009-04-01

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    laomiao 发表于11:10 | 编辑 | 继续话题 | 转发 | 分享　0

    评论

  • 小忽雷你好，想请问一下 DCI 里面的 "Modulation and coding scheme" 对应的 modulation and coding rate 数值在哪份协议里面有写呢？
    我在 36.213 里面的 table 7.1.7.2.1-1 只有看到 32 种 index，想知道他对应的数值到底是多少。
    izuk1234 | 发表于2009-07-22 16:19:35 [回复]