A communication method and device, and a chip system are provided, to adjust, by adjusting a quantity of slot resources included in a multiframe, a bandwidth resource corresponding to one multiframe. A first communication device in this application sends a first request message. The first request message is used to request to adjust a quantity of basic frames in a multiframe included in a second block sequence. The first communication device multiplexes, based on S 1 slot resources corresponding to the adjusted multiframe in the second block sequence, Q1 first block sequences corresponding to a slot resource in the S 1 slot resources, to obtain and send the second block sequence. The quantity of basic frames in the multiframe may be adjusted. In other words, a quantity of slot resources corresponding to data carried in one multiframe may be adjusted. In other words, the bandwidth corresponding to one multiframe may be adjusted. Therefore, a bandwidth of a service corresponding to the multiframe may be further adjusted based on the adjusted bandwidth corresponding to the multiframe.