| CPC H04W 28/06 (2013.01) [H04L 1/0068 (2013.01); H04W 84/12 (2013.01)] | 20 Claims |

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1. A method, comprising:
receiving, by a wireless local area network (WLAN) receiving device by using a first radio frequency module through a first channel, first data that is sent by a WLAN sending device, wherein the first data is all of or a part of original data, the original data comprises an original information field and an original check field, the original check field carries a result of checking the original information field, and the first channel is a WLAN channel;
receiving, by the WLAN receiving device by using a second radio frequency module through a second channel, second data that is sent by the WLAN sending device, wherein the second data is all of or a part of the original data, the second channel is a WLAN channel, a frequency of the second channel is different from a frequency of the first channel, the second radio frequency module is different from the first radio frequency module, and the second data is different from the first data;
obtaining, by the WLAN receiving device, a received information field based on an information field of the first data or an information field of the second data;
obtaining, by the WLAN receiving device, a received check field based on a check field of the first data or a check field of the second data; and
attempting, by the WLAN receiving device, to check the received information field by using the received check field, to obtain the original information field,
wherein the first data comprises a first information field and a first check field, the second data comprises only a second check field, and the received information field is the first information field; or
the first data comprises a first information field and a first check field, the second data comprises only a second information field, and the received information field is the first check field.
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