Method, apparatus, and system for adjusting data packet length in near field communication NFC

摘要

Embodiments of the present invention disclose a method for adjusting a data packet length in near field communication NFC, an apparatus, and a system. The method includes: determining, by an NFCC of a first NFC device, whether the NFCC is responsible for determining a maximum length value of data packets transmitted in subsequent communication; if yes, sending a first request comprising a first length value to a second NFC device, where the first request is used to instruct to adjust the maximum length value of the data packets transmitted between the first NFC device and the second NFC device in the subsequent communication to the first length value, the first length value is a value determined by the NFCC, and the first request further includes a first DID; receiving a first response that is returned by the second NFC device for the first request and that comprises a second DID; and when the first DID is the same as the second DID, using the first length value as the maximum length value of the data packets transmitted in the subsequent communication. As can be seen, the embodiments of the present invention can implement, by using the NCI specification, a function that an NFCC and an NFC device that is used as a target adjust a maximum length value of communication data packets in a subsequent communication process.