信息交换方法，信息处理器，信息收集系统，通信方法，通信系统，中间装置和通信装置。
Information providing method, information processing device, information collection system, communication method, communication system, relay device, and communication device.
CPC方法需要收集所有通信链路的信道信息，系统开销大。
The CPC approach needs to collect channel information of all communication links in the system, which costs much system overhead.
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