Packet transmission method

A packet transmission method, adapted for a wireless distribution system (WDS), wherein the wireless distribution system comprises a wireless local area network access controller (AC), a first wireless access point (AP) and a second wireless access point, and the AC communicates with the first wireless access point through an Ethernet, and the first wireless access point communicates with the second wireless access point through a wireless connection, the packet transmission method comprising:

• determining whether a packet of the AC or the second wireless access point belongs to a Control and Provisioning of Wireless Access Point (CAPWAP) packet;
• adding a tag into a packet descriptor corresponding to the packet when the packet belongs to the CAPWAP packet;
• transmitting the packet from the first wireless access point to the second wireless access point, or transmitting the packet from the second wireless access point to the first wireless access point;
• determining whether the operation of transmitting the packet has an error;
• determining whether the packet descriptor has the tag when the operation of transmitting the packet has the error and
• adding the packet into a queue when the packet descriptor has the tag.