| 摘要 |
A SYSTEM COMPRISES A WIRELESS MASTER UNIT AND ONE OR MORE WIRELESS SLAVE UNITS, EACH HAVING A UNIQUE IDENTIFIER (301).WHEN A WIRELESS SLAVE UNIT IS ACTIVE, IT IS ADDRESSED BY ONE OF A LIMITED NUMBER OF TEMPORARY ADDRESSES (305).A PARK MODE ENABLES A WIRELESS SLAVE UNIT TO BE IN AN IDLE STATE DURING ITS TEMPORARY ADDRESS (305) IS DEALLOCATED, ENABLING THAT ADDRESS TO BE ASSSIGNED TO ANOTHER WIRELESS SLAVE UNIT. TO PAGE A PARKED SLAVE,A PAGING BEACON PACKET (101) IS BROADCAST TO,AND RECEIVED BY, EACH OF THE WIRELESS SLAVE UNITS AT FIXED INTERVALS DURING A MASTER-TO-SLAVE TIME SLOT. EACH WIRELESS SLAVE UNIT DETERMINES WHETHER THE RECEIVED PAGING BEACON PACKET (101) INCLUDES ITS UNIQUE IDENTIFIER (301).IF SO, THE WIRELESS SLAVE UNITS RETRIEVES A TEMPORARY ADDRESS (305) FROM THE PAGING BEACON PACKET (101).THE WIRELESS UNIT TRANSMITS A RESPONSE TO THE WIRELESS MASTER UNIT DURING A SUBSEQUENT SLAVE-TO-MASTER TIME SLOT IF THE RECEIVED PAGING BEACON PACKET (101) INCLUDED THE UNIQUE IDENTIFIER (301) BELONGING TO THE WIRELESS SLAVE UNIT. PARKED WIRELESS SLAVE UNITS ARE ALSO ASSIGNED UNIQUE RESPONSE NUMBER BY THE MASTER.THE MASTER BROADCASTS A POLLING BEACON PACKET (601,701) DURING A MASTER-TO -SLAVE TIME SLOT. IF THE PARKED SLAVE UNIT DESIRES ACCESS TO THE CHANNEL, IT TRANSMITS A RESPONSE IN AN N: TH SLAVE-TO-MASTER TIME SLOT FOLLOWING THE POLLING BEACON PACKET,WHERE N IS A FUNCTION OF THE SLAVE,S UNIQUE RESPONSE NUMBER.(FIG 3) |
