Hi, please find below my comments
1. 小区ID的范围是多少？是0~503这些整数吗？
>Yes, you are right. There are total 504 PCIs in LTE, which can be reused if possible.
2. 上层是怎么传给下层的？给的信息的格式？范围？（RE映射过程中需要许多高层信令）
>Higher layer signaling refers to RRC signaling, you can find them in 3GPP spec. 36.331, such as in RRCConnectionReconfiguration...
3. RE映射输入的数据符号流的速率是多少？输出的数据符号流是并行，还是串行？输出符号流速率是多少？
>Before modulation mapping (i.e. PSK/QAM...), data rate is in unit of "bps" (bits per second), and after that, data rate is in unit of "sps"(symbols per second). If interested, you can calculate "sps" for each processing step, such as modulation mapping, layer mapping, precoding... RE mapping actually doesn't change "sps". After percoding, symbol stream for each antenna port is serial, and OFDM IFFT is applied after S/P transformation.
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5. 下行预编码后出来的数据感觉不知道是不是频域的？（感觉根本就可以不必区分是频域还是时域，OFDM的生成只是刚刚好与IFFT一样而已。所以可以直接把调制后的数据点当成频域的离散点）
>In my opinion, it always time-domain baseband signals after "OFDM signal generation", so you can take it as frequency domain.
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8. 下行链路信息（信令及数据）经过层映射及预编码之后，分成一个或者多个天线端口传输数据，是不是每个天线端口将独自形成子帧？Release9中只有PDSCH使用天线端口 5、7、8，映射过程时应该如何处理
>No, antenna port is only for ease of MIMO operation and RS mapping. It is always the very subframe, but each antenna port may have different symbols. Antenna port 5/7/8 is related to beamforming, and dedicated RS(or UE-specific RS) is the most important concern. In other words, DRS is different for each antenna port 5/7/8, including time-frequency position and RS sequence... As to PDSCH processing when beamforming is configured for a UE(i.e. antenna port 5/7/8 is configured), PDSCH can't be mapped on REs occupied by CRS and DRS.
9. 天线端口与RE映射的关系是什么？有没有例子可以说明？
>Refer to problem #8.
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[ 本帖最后由 jeffyko 于 2012-1-4 12:04 编辑 ]
时间: 2012-1-4 13:13
作者: jeffyko
continue after lunch...
11. DVRB映射过程中，VRB数目因Gap的变化而变化，这样做有什么意义？
12. DCI指示RB分配时使用DVRB，DCI Format 1A没有指示Gap，但DCI Format 1C有指示Gap。为什么会这样？
>I don't know much about VRB. In my opinion, purpose of VRB is to get some kind of frequency diversity. The gap varies with system bandwidth(i.e. DL RB number), and the number of VRB varies accordingly. As to the difference of DCI 1A and 1C with type 2 allocation, it is already specified in 36.211 and 36.213. I guess the difference is because usage for DCI 1A and 1C is quite different.
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15. 小区参考信号映射过程中，小区偏移只有6个，可小区ID有504个，这样的偏移会不会导致将小区参考信号的覆盖？
>Yes, you are right. As a result, PCI in LTE needs careful planning to avoid collision. General rules for PCI planning should follow: PCI mod 3 or PCI mod 6 shall not be equal for neighbor cells.
16. PHICH的RE位置关于小区ID进行偏移，那可以偏移多少个RE？如何确定？
>Actually, formulas for calculating the shift are already specified in 36.211. Just calculate it by yourself.
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18. 资源分配Type1中，指示中的最高2~3bit作为第1，2个区域，是这样子吗？
19. Extended CP时，PHICH组在经过Layer Mapping&Precoding时，是两个PHICH组结合成12符号吗？
20. 参考信号要不要经过预编码？
>RS doesn't perform precoding since it is just plain sequence.
时间: 2012-1-4 13:40
作者: jeffyko
final part...
21. RE映射是如何区分传输过来的符号块？（如：来了16个调制符号，但RE映射模块接收时，是如何知道是来了16个，而不是来了15个呢？）
>It is just a software implementation problem, like an input parameter to a function, and that's all that happens.
22. PMCH与PDSCH的混合载波子帧是如何实现的？是采用时分复用？频分复用？还是时分+频分？
23. PDCCH中的CCE有什么作用？它与资源映射又有什么关系？
>Coding rate varies with different CCE aggregation level, and as a result PDCCH performance differentiates. Larger CCE consumes more resources, for example, 8CCE occupies twice times REs than 4CCE.
24. PDCCH从预编码之后传递过来的数据，是不是先传递公共搜索空间的信息、再传递专用搜索空间的信息？
>First, PDCCH is never precoded. Second, PDCCH decoding strategy depends on DCI format, please refer to 36.213.
25. PDSCH的资源分配是指示资源序号？还是整个指示整个RB？还是指示RB-Pair？（RB中可能有些RE被PCFICH、PHICH、PDCCH、参考信号占据）？如果分配的是DVRB，那与DVRB是如何联系的？（DVRB是以RB-pair为单位）
>PDSCH assignment is specified in corresponding PDCCH. Please refer to 36.212.
26. PDSCH可单用户、多用户。当使用多用户技术（MU-MIMO）时，是如何进行多个用户的资源分配呢？
>MU-MIMO means that multiple users occupy the same radio resources(i.e. RBs), and they are seperated by CDMA likewise method. DL resouce allocation for MU-MIMO has no essential difference with SU-MIMO.
27. 所有信道、参考信号、同步信号都有相关的发射功率，这个功率是什么作用？如何实现?
>Power allocation or power control is used in LTE to get expected performance(such as coverage distance, data throughput...) for each channel or signal. Implementations may vary with different vendors.