Release 8 46 3GPP TS 36.211 V8.5.0 (2008-12)
表 6.3.4.2.3-2: 在天线端口?0,1,2,3?上传输的预编码码本
码字索引 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 un 1 {1} W0层数? 2 {14}W03 4 u0??1?1?1?1?T u1??1?j1u3??1j?T 2 2 2 2 2 2 2 2 {124}W03 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 {1234}W02 W1{1} {1} W2{1} W3{1} W4W1{12}{12}W2W1{123}{123}W2{123}W3{124}W4{124}W5{134}W6{134}W7W1{1234}2 {3214}W22 u2??11?11?T j1?j?T u4?1(?1?j)u5u6u7???1??1??12?j(1?j)2j(?1?j)2 2 2 2 (1?j)(1?j)(?1?j)??W3{12}{14}W4W3{3214}2 {1234}W42 TT{1} W5{1} W6{1} W72?j(?1?j)2j(1?j)??W5{14}{13}W6{13}W7W5{1234}2 {1324}W62 {1324}W72 TTu8??1?111?T u9??1?j?1?j?T u10??111?1?T u11??1j?1j?T u12??1?1?11?T u13??1?11?1?T u14??11?1?1?T u15??1111?T W8{1} {1} W9{1} W10{1} W11{1} W12{1} W13{1} W14W8{12}W9{14}{13}W10{13}W11{12}W12{13}W13{13}W14{12}W152 2 2 2 W8{124}{134}W9{123}W10{134}W11{123}W12{123}W13{123}W14{123}W15W8{1234}2 W9{1234}2 {1324}W102 {1324}W112 {1234}W122 {1324}W132 {3214}W142 2 2 2 {1} W152 {1234}W152
6.3.4.3 发射分集预编码
Precoding for transmit diversity is only used in combination with layer mapping for transmit diversity as described in
Section 6.3.3.3. The precoding operation for transmit diversity is defined for two and four antenna ports. For transmission on two antenna ports, p??0,1?, the output y(i)?y(0)(i)precoding operation is defined by
?ap?1 of the y(1)(i), i?0,1,...,Msymb?T?y(0)(2i)??x(0)(i)??(1)??(1)*?y(2i)1?????x(i)?
(1)?y(0)(2i?1)?2?x(i)??(1)??(0)*?y(2i?1)??????x(i)??layeraplayerfori?0,1,...,Msymb。注意，资源映射在频域分配y，即SFBC编码，不是STBC。 ?1 with Msymb?2MsymbFor transmission on four antenna ports,p??0,1,2,3?, the output y(i)?y(0)(i)api?0,1,...,Msymb?1 of the precoding operation is defined by
?y(1)(i)y(2)(i)y(3)(i),
?T3GPP
Release 8 47 3GPP TS 36.211 V8.5.0 (2008-12)
?y(0)(4i)??x(0)(i)??(1)???y(4i)0?????y(2)(4i)???x(1)*(i)??(3)????y(4i)??0??y(0)(4i?1)??x(1)(i)??(1)????y(4i?1)??0??y(2)(4i?1)??x(0)*(i)?????(3)?y(4i?1)?1?0??(0)???? y(4i?2)02?????y(1)(4i?2)??x(2)(i)??(2)????y(4i?2)??0??y(3)(4i?2)???x(3)*(i)??(0)????y(4i?3)??0??(1)??(3)??y(4i?3)??x(i)??y(2)(4i?3)??0??(3)??(2)*?y(4i?3)???x(i)?for i?0,1,...,
layerapMsymb?1 with Msymblayer(0)?if Msymbmod4?0?4Msymb. ??layer(0)??4Msymb?2if Msymbmod4?0??6.3.5 映射到资源单元
ap对于每个用于物理信道传输的天线端口，复值符号块y(p)(0),...,y(p)(Msymb?1) 需要映射到不用于PCFICH，
PHICH，PDCCH，PBCH，同步信号和参考信号传输的虚拟资源块对应的资源单元?k,l?中。
6.4 物理下行共享信道PDSCH
PDSCH由6.3节内容操作，以下例外：
- 在不传输UE专用RS的资源块中，PDSCH采用与PBCH同样的天线端口集，即?0?，?0,1?或?0,1,2,3? - 在传输UE专用RS的资源块中，PDSCH应在天线端口?5?上传输。
6.5 物理组播信道PMCH
The physical multicast channel shall be processed and mapped to resource elements as described in Section 6.3 with the following exceptions: - 不采用发射分集方案
- Layer mapping and precoding shall be done assuming a single antenna port and the transmission shall use antenna port 4. - In the subframes where PMCH is transmitted on a carrier supporting a mix of PDSCH and PMCH transmissions, up to two of the first OFDM symbols of a subframe can be reserved for non-MBSFN transmission and shall not be used for PMCH transmission. In a cell with 4 cell-specific antenna ports, the first two OFDM symbols of a subframe are reserved for non-MBSFN transmission in the subframes in which the PMCH is transmitted. The non-MBSFN symbols shall use the same cyclic prefix as used for subframe #0. PMCH shall not be transmitted in subframes 0 and 5 on a carrier supporting a mix of PDSCH and PMCH transmission
3GPP
Release 8 48 3GPP TS 36.211 V8.5.0 (2008-12)
6.6
6.6.1
物理广播信道PBCH
加扰
~b(i)??b(i)?c(i)?mod2
传输块b(0),...,b(Mbit?1)在调制前通过加扰得到：
cell这里加扰序列c(i)参见 7.2，在每个满足nfmod4?0的无线帧中初始化cinit?NID，常规CP中，Mbit?1920，扩展CP中，Mbit?1728。
6.6.2 调制
采用QPSK调制。
6.6.3 层映射和预编码
采用单端口或发射分集层映射和预编码。
6.6.4 Mapping to resource elements
The block of complex-valued symbolsy(p)(0),...,y(p)(Msymb?1) for each antenna port is transmitted during 4 consecutive radio frames starting in each radio frame fulfilling nfmod4?0 and shall be mapped in sequence starting with y(0) to resource elements ?k,l?. The mapping to resource elements ?k,l? not reserved for transmission of
reference signals shall be in increasing order of first the indexk, then the index l in slot 1 in subframe 0 and finally the radio frame number. The resource-element indices are given by
DLRBNRBNsck??36?k', k'?0,1,...,71 2l?0,1,...,3这里计算不包括参考信号预留资源，UE应假设天线端口0-3资源都已预留，即使不是，也假设不用于PDSCH传输。
6.7 物理控制格式指示信道PCFICH
PCFICH用于指示PDCCH一个子帧中OFDM符号个数，如表6.7-1所示。当OFDM符号个数大于零，需要传输PCFICH。
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Release 8 49 3GPP TS 36.211 V8.5.0 (2008-12)
表6.7-1: PDCCH中OFDM符号个数
子帧 帧格式2中子帧1和6 支持PDSCH和PMCH的载波上的MBSFN子帧，1或2个小区专用天线端口 支持PDSCH和PMCH的载波上的MBSFN子帧，4个小区专用天线端口 不支持PDSCH的载波上的MBSFN子帧 所有其他情况 DLNRB?10时符号个数 DLNRB?10时符号个数 1, 2 1, 2 2 0 1, 2, 3 2 2 2 0 2, 3, 4 6.7.1 加扰
~b(i)??b(i)?c(i)?mod2
~~比特块b(0),...,b(31)通过加扰获得b(0),...,b(31)：
这里加扰序列 c(i)参见7.2节，初始化cinitcellcell。 ???ns2??1??2NID?1?29?NID??6.7.2 调制
~~加扰比特b(0),...,b(31)采用表6.7.2-1进行调制，得到调制符号d(0),...,d(15)。
表6.7.2-1: PCFICH调制方案
Physical channel Modulation schemes PCFICH QPSK 6.7.3 层映射与预编码
(0)采用单天线端口和发射分集两种层映射和预编码方式，参见 6.3.3.1或6.3.3.3，Msymb?16，6.3.4.1或.3.4.3，
与PBCH使用同样天线端口集。
6.7.4 映射到资源单元
The mapping to resource elements is defined in terms of quadruplets of complex-valued symbols. Let
z(p)(i)?y(p)(4i),y(p)(4i?1),y(p)(4i?2),y(p)(4i?3) denote symbol quadruplet i for antenna portp. For each of
the antenna ports, symbol quadruplets shall be mapped in increasing order of i to the four resource-element groups in the first OFDM symbol in a downlink subframe with the representative resource-element as defined in Section 6.2.4 given by
z(p)(0)is mapped to the resource-element group represented byk?kz(p)(1)DLRBis mapped to the resource-element group represented byk?k?NRB2?Nsc2z(p)(2)is mapped to the resource-element group represented byk?k?z(p)(3)is mapped to the resource-element group represented byk?k?DLRBNsc , where the additions are modulo NRB??DLRB2??Nsc?2NRBDLRB2??Nsc?3NRB22
RBcellDLk?Nsc2?NIDmod2NRB
celland NID is the physical-layer cell identity as given by Section 6.11.
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Release 8 50 3GPP TS 36.211 V8.5.0 (2008-12)
6.8
6.8.1
物理下行控制信道 PDCCH
PDCCH 格式
PDCCH承载调度分配和其他控制信息。物理控制信道在一个或多个控制信道单元CCE上传输，一个CCE包含9个资源单元组（36个资源单元）。所有可用CCE总数为NCCE??NREG/9?，NREG为不分配给PCFICH或 PHICH的资源单元组个数。PDCCH支持多个格式，如表6.8.1-1所示。包含n个连续CCE的PDCCH可以从满足imodn?0的CCE i开始， 这里i为CCE序号。 一个子帧中可以传输多个PDCCH。
表6.8.1-1: 可支持的PDCCH 格式（QPSK调制）
PDCCH 格式 0 1 2 3 CCEs数量 1 2 4 8 资源单元组数量 9 18 36 72 PDCCH 比特数量 72 144 288 576
6.8.2 PDCCH 复用与加扰
(i)(i)The block of bitsb(i)(0),...,b(i)(Mbit is ?1) on each of the control channels to be transmitted in a subframe, where Mbitthe number of bits in one subframe to be transmitted on physical downlink control channel number i, shall be multiplexed, resulting in a block of
(nPDCCH-1)(0)(1)bitsb(0)(0),...,b(0)(Mbit?1),b(1)(0),...,b(1)(Mbit?1),...,b(nPDCCH?1)(0),...,b(nPDCCH?1)(Mbit?1), where nPDCCH is the
number of PDCCHs transmitted in the subframe.
(nPDCCH-1)(0)(1)The block of bits b(0)(0),...,b(0)(Mbit?1),b(1)(0),...,b(1)(Mbit?1),...,b(nPDCCH?1)(0),...,b(nPDCCH?1)(Mbit?1) shall be
scrambled with a cell-specific sequence prior to modulation, resulting in a block of scrambled bits ~~b(0),...,b(Mtot?1)according to
~b(i)??b(i)?c(i)?mod2
where the scrambling sequence c(i) is given by Section 7.2. The scrambling sequence generator shall be initialised
cellwith cinit??ns2?29?NID at the start of each subframe.
CCE 序号n对应比特b(72n),b(72n?1),...,b(72n?71)。需要的话， If necessary,
6.8.3 Modulation
仅采用QPSK调制方式
6.8.4 层映射和预编码
(0)仅采用单天线端口和发射分集两种层映射和预编码方式，参见 6.3.3.1或6.3.3.3，Msymb?16，6.3.4.1
或.3.4.3，与PBCH使用同样天线端口集。
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