Communication method and device

The invention relates to a communication method and device. A terminal device determines channel state information according to S indexes of S vectors, each of the S vectors is included in a first vector quantization dictionary, the first vector quantization dictionary comprises N1 vectors, and N1 and S are both positive integers. And the terminal equipment sends the channel state information to network equipment. The dimension of the vector included in the vector quantization dictionary is generally large, and the channel information is quantized by using the first vector quantization dictionary, which is equivalent to carrying out dimension expansion on the channel information or maintaining the higher dimension as much as possible, so that high-precision feedback can be realized through lower signaling overhead. 本申请涉及一种通信方法及装置。终端设备根据S个向量的S个索引确定信道状态信息，所述S个向量中的每个向量包括于第一向量量化字典中，所述第一向量量化字典包括N1个向量，其中，N1和S均为正整数。终端设备向网络设备发送所述信道状态信息。由于向量量化字典包括的向量的维度一般比较大，用第一向量量化字典来对信道信息进行量化，相当于对信道信息进行了扩维或者尽可能维持较高维度，从而可以通过较低的信令开销实现