초록 ▼

Mobile client based wireless communication is enhanced by using geographical position information of a respective mobile client relative to one or more communication dead zones. When a mobile client is approaching a dead zone, data communications can be delayed until the dead zone is traversed, or g

Mobile client based wireless communication is enhanced by using geographical position information of a respective mobile client relative to one or more communication dead zones. When a mobile client is approaching a dead zone, data communications can be delayed until the dead zone is traversed, or given a higher priority to expedite transmission completion before dead zone entry. A mobile client communicates its position information to the base station, where this position information can be compared with the locations of respective dead zones. The base station can determine and communicate to a mobile unit, an estimated time before the mobile unit will enter a dead zone. The mobile unit can use this information to determine whether sufficient time remains before entering the dead zone to transmit one or more blocks of data, for instance.

대표청구항 ▼

Mobile client based wireless communication is enhanced by using geographical position information of a respective mobile client relative to one or more communication dead zones. When a mobile client is approaching a dead zone, data communications can be delayed until the dead zone is traversed, or g

Mobile client based wireless communication is enhanced by using geographical position information of a respective mobile client relative to one or more communication dead zones. When a mobile client is approaching a dead zone, data communications can be delayed until the dead zone is traversed, or given a higher priority to expedite transmission completion before dead zone entry. A mobile client communicates its position information to the base station, where this position information can be compared with the locations of respective dead zones. The base station can determine and communicate to a mobile unit, an estimated time before the mobile unit will enter a dead zone. The mobile unit can use this information to determine whether sufficient time remains before entering the dead zone to transmit one or more blocks of data, for instance. in claim 4, wherein said magnetic field forming means exerts a magnetic force that allows toner being driven by said toner conveying means to move into said developing section via said toner outlet. 6. The apparatus as claimed in claim 1, wherein said magnetic field forming means surrounds an entire circumference of said toner passage and has opposite polarities alternating with each other in a circumferential direction of said toner passage. 7. The apparatus as claimed in claim 6, wherein said magnetic field forming means exerts a magnetic force that allows toner being driven by said toner conveying means to move into said developing section via said toner outlet. 8. The apparatus as claimed in claim 6, wherein said magnetic field forming means covers said toner outlet and has a portion thereof corresponding to said toner outlet notched. 9. The apparatus as claimed in claim 8, wherein said magnetic field forming means exerts a magnetic force that allows toner being driven by said toner conveying means to move into said developing section via said toner outlet. 10. The apparatus as claimed in claim 1, wherein said magnetic field forming means exerts a magnetic force that allows toner being driven by said toner conveying means to move into said developing section via said toner outlet. 11. An image forming apparatus comprising: a rotary developing device adjoining an image carrier and including a plurality of developing sections for developing a latent image formed on said image carrier with a magnetic developer; a toner cartridge unit including a plurality of toner cartridges and rotatable integrally with said developing device; a mechanism configured to rotate said rotary developing device and said toner cartridge unit at rotating speeds of 1 second for 90° of rotation and above; a plurality of toner conveying means each connecting one of said plurality of toner cartridges to an associated one of said plurality of developing sections, wherein said plurality of toner conveying means each include a toner passage and a toner conveying member disposed in said toner passage; and magnetic field forming means adjoining a toner outlet, which is formed in said toner passage and communicated to said developing section, for forming a magnetic field that completely traverses said toner passage through a central region of said toner passage. 12. An image forming apparatus comprising: a rotary developing device adjoining an image carrier and including a plurality of developing sections for developing a latent image formed on said image carrier with a magnetic developer; a toner cartridge unit including a plurality of toner cartridges and rotatable integrally with said developing device; a mechanism configured to rotate said rotary developing device and said toner cartridge unit; a plurality of toner conveying means each connecting one of said plurality of toner cartridges to an associated one of said plurality of developing sections, wherein said plurality of toner conveying means each include a toner passage and a toner conveying member disposed in said toner passage; and magnetic field forming means adjoining a toner outlet, which is formed in said toner passage and communicated to said developing section, for forming a magnetic field that completely traverses said toner passage through a central region of said toner passage; wherein toner stored in each of said plurality of toner cartridges has cohesiveness of 10% or below. 13. An image forming apparatus comprising: a rotary developing device adjoining an image carrier and including a plurality of developing sections for developing a latent image formed on said image carrier with a magnetic developer; a toner cartridge unit including a plurality of toner cartridges and rotatable integrally with said developing device; a mechanism configured to rotate said rotary developing device and said toner cartridge unit; a plurality of toner conveying means each connecti ng one of said plurality of toner cartridges to an associated one of said plurality of developing sections, wherein said plurality of toner conveying means each include a toner passage and a toner conveying member disposed in said toner passage; and magnetic field forming means adjoining a toner outlet, which is formed in said toner passage and communicated to said developing section, for forming a magnetic field that completely traverses said toner passage through a central region of said toner passage; wherein said toner passage and said toner conveying member each are formed--of a nonmagnetic material, and said toner conveying member conveys, when driven, the magnetic developer being magnetically retained in said toner passage by said magnetic field forming means. 14. An image forming apparatus comprising: a rotary developing device adjoining an image carrier and including a plurality of developing sections for developing a latent image formed on said image carrier with a magnetic developer; a toner cartridge unit including a plurality of toner cartridges and rotatable integrally with said developing device; a mechanism configured to rotate said rotary developing device and said toner cartridge unit; a plurality of toner conveying means each connecting one of said plurality of toner cartridges to an associated one of said plurality of developing sections, wherein said plurality of toner conveying means each include a toner passage and a toner conveying member disposed in said toner passage, said toner conveying member being formed as a screw having a predetermined pitch between screw turns; and magnetic field forming means extending from a toner outlet, which is formed in said toner passage and communicated to said developing section, to a position upstream of said toner outlet in a direction of toner conveyance by a distance corresponding to a distance of one predetermined pitch or a distance of two predetermined pitches for forming a magnetic field. 15. An image forming apparatus comprising: a rotary developing device adjoining an image carrier and including a plurality of developing sections for developing a latent image formed on said image carrier with a magnetic developer; a toner cartridge unit including a plurality of toner cartridges and rotatable integrally with said developing device; a mechanism configured to rotate said rotary developing device and said toner cartridge unit; a plurality of toner conveying means each connecting one of said plurality of toner cartridges to an associated one of said plurality of developing sections, wherein said plurality of toner conveying means each include a toner passage and a toner conveying member disposed in said toner passage; magnetic field forming means adjoining a toner outlet, which is formed in said toner passage and communicated to said developing section, for forming a magnetic field; and a shutter having holes at only one portion thereof attached to a toner inlet, which is formed in said developing section and communicated to said toner outlet, for communicating said developing device to said toner passage while said developing section is in rotation or restricting a flow of the magnetic developer out of said developing section when said developing section is dismounted from said developing device. 16. The apparatus as claimed in claim 15, wherein said shutter is selectively opened or closed in interlocked relation to mounting/dismounting of said developing section.