Wireless lan system and method for roaming in a multiple base station

A method of controlling communication in a wireless communication system including a plurality of base transceiver stations and at least one wireless system terminal, the method comprising the steps of:

• causing said at least one wireless system terminal to be concurrently connected to at least two of the base transceiver stations;
• causing each of said at least two of the base transceiver stations to buffer communication data to be transmitted to said at least one wireless system terminal connected in common;
• and
• causing one of said at least two of the base transceiver stations with a smallest communication load to transmit the buffered communication data to said at least one wireless system terminal connected thereto.

A method of controlling communication in a wireless LAN system including a plurality of base transceiver stations and at least one wireless system terminal, wherein the wireless LAN system includes a base transceiver station managing server for managing the base transceiver stations, and wherein the method comprises the steps of:

• causing said at least one wireless system terminal to be concurrently connected to at least two of the base transceiver stations;
• causing the base transceiver station managing server to detect a communication load on each of the base transceiver stations;
• causing the base transceiver station managing server to select one of the base transceiver stations that buffers communication data to be transmitted to said at least one wireless system terminal, based on the communication load on said each of the base transceiver stations;
• causing said one of the base transceiver stations thus selected to buffer the communication data;
• and
• causing said one of the base transceiver stations thus selected to transmit the buffered communication data to said at least one wireless system terminal.

A wireless LAN system including a wireless system terminal, wherein the wireless system terminal comprises:

• a wireless communication unit concurrently connected to a plurality of base transceiver stations for buffering identical communication data to be transmitted to the wireless system terminal;
• a link table for storing the connected base transceiver stations;
• and
• a communication processing procedure unit for referring to the link table when receiving the communication data to be transmitted to the wireless system terminal from one of the connected base transceiver stations, and then sending a buffered data discard signal to each of the connected base transceiver stations other than said one of the base transceiver stations that has transmitted the communication data.

A wireless LAN system including base transceiver stations, wherein each of the base transceiver stations comprises:

• a wireless communication unit concurrently connected to a plurality of wireless system terminals;
• a link table for storing the connected wireless system terminals;
• a buffer for temporarily storing communication data to be transmitted to each of the wireless system terminals stored in the link table, for said each of the wireless system terminals;
• and
• a communication processing procedure unit for clearing the buffer when receiving a discard signal from one of the wireless system terminals stored in the link table before the communication data stored in the buffer is transmitted to said one of the wireless system terminals.