초록 ▼

Improved apparatus for a radio communication system having a multiplicity of mobile transceiver units selectively in communication with a plurality of base transceiver units which, in turn, communicate with one or more host computers for storage and manipulation of data collected by bar code scanner

Improved apparatus for a radio communication system having a multiplicity of mobile transceiver units selectively in communication with a plurality of base transceiver units which, in turn, communicate with one or more host computers for storage and manipulation of data collected by bar code scanners or other collection means associated with the mobile transceiver units. A network controller and an adapter which has a simulcast and sequential mode provide selective interface between host computers and base transceivers. A scheme for routing data through the communication system is also disclosed wherein the intermediate base stations are organized into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically. Additionally, redundant network and communication protocol is disclosed wherein the network utilizes a polling communication protocol which, under heavy loaded conditions, requires that a roaming terminal wishing to initiate communication must first determine that the channel is truly clear by listing for an entire interpoll gap time. In a further embodiment, a criterion used by the roaming terminals for attaching to a given base station reduces conflicts in the overlapping RF regions of adjacent base stations.

대표청구항 ▼

What is claimed is: 1. A terminal for use in a wireless. communication system in which a periodic timeslot at a substantially constant period is generally reserved for a particular type of packet, the terminal comprising:at least one processor operable to, at least:deactivate communication circuitry

What is claimed is: 1. A terminal for use in a wireless. communication system in which a periodic timeslot at a substantially constant period is generally reserved for a particular type of packet, the terminal comprising:at least one processor operable to, at least:deactivate communication circuitry of the terminal in a sleep mode through a plurality of the substantially constant periods;synchronize activation of the communication circuitry from the sleep mode to receive a packet transmitted in the periodic timeslot; anddetermine from at least the received packet whether to return the communication circuitry to the sleep mode.