| CPC G06K 7/10108 (2013.01) | 18 Claims |

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1. A method, comprising:
receiving, by a first device, first signaling from a second device, wherein the first signaling is useable to indicate that the second device successfully received first identity information from the first device and is useable to indicate to the first device to send second identity information to the second device, the first signaling comprises a first inventory identifier, and the first inventory identifier is useable to indicate an identifier of an ongoing inventory process of the second device;
determining, by the first device based on the first signaling, that the first inventory identifier is the same as a second inventory identifier, wherein the second inventory identifier is useable to indicate an identifier of an ongoing inventory process of the first device; and
sending, by the first device, the second identity information to the second device;
wherein the first signaling comprises an identity (ID) of the second device, and
the sending, by the first device, the second identity information to the second device comprises:
determining, by the first device, that a response list stored by the first device comprises the ID of the second device; and
sending, by the first device, the second identity information to the second device.
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