最新的211协议里给出了很多种天线端口，有CRS，和PDSCH相关的DMRS，和PDCCH相关的DMRS，还有定位参考信号PRS的端口，以及CSI参考信号的天线端口，在最开始也解释了天线端口的意思即：
An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. There is one resource grid per antenna port. The set of antenna ports supported depends on the reference signal configuration in the cell:
- Cell-specific reference signals support a configuration of one, two, or four antenna ports and are transmitted on antenna ports p=0 ,p={0,1} , and p={0,1,2,4} , respectively.
- MBSFN reference signals are transmitted on antenna port p=4.
- UE-specific reference signals associated with PDSCH are transmitted on antenna port(s) p=5,p=7,p=8 , , or one or several of p={7-14} .
- Demodulation reference signals associated with EPDCCH are transmitted on one or several of p={107-110}.
- Positioning reference signals are transmitted on antenna port p=6.
- CSI reference signals support a configuration of one, two, four or eight antenna ports and are transmitted on antenna ports p=15 , p=15,p=16 , p=15-18 and p=15-22 , respectively.
Two antenna ports are said to be quasi co-located if the large-scale properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed. The large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, and average delay.

那个天线端口的定义，感觉说的好玄，还有最后面说两个天线端口被认为是quasi co-located ，这里的quasi co-located 表示什么意思呢？表示两个天线端口上的一些的大尺度参数一样？
这里还请教大家一个问题，每个天线端口都是一块资源栅格，比方都是100个RB，那天线端口0上是不是只有CRS？或者说端口107-110上只有和EPDCCH相关的DMRS？
协议的后面某些地方说到端口0-3和端口107-110被认为是quasi co-located ，那这种情况表示既有CRS又有和EPDCCH相关的DMRS吧？
欢迎大家踊跃讨论交流~