초록 ▼

The current invention relates to a cellular communication system. Known communication systems performs cell selection based on measurements of downlink pilot signal levels. However, this is inefficient as uplink conditions can have significant impact on the performance. In the current invention a su

The current invention relates to a cellular communication system. Known communication systems performs cell selection based on measurements of downlink pilot signal levels. However, this is inefficient as uplink conditions can have significant impact on the performance. In the current invention a subscriber unit (300) comprises receiving means (305) for receiving uplink characteristics information transmitted from a target set of base stations (201,203). The subscriber unit (300) further comprises base station selection means (309) for determining at least one serving base station in response to said uplink characteristics information, and transmitting means (311) for accessing the cellular communication system through said at least one serving base station. Preferably, the subscriber unit (300) comprises means for calculating an access message transmit power level and the base station having the lowest calculated access message transmit power level is selected. The invention is particularly applicable to 3rdgeneration cellular communication systems such as UMTS.

대표청구항 ▼

The current invention relates to a cellular communication system. Known communication systems performs cell selection based on measurements of downlink pilot signal levels. However, this is inefficient as uplink conditions can have significant impact on the performance. In the current invention a su

The current invention relates to a cellular communication system. Known communication systems performs cell selection based on measurements of downlink pilot signal levels. However, this is inefficient as uplink conditions can have significant impact on the performance. In the current invention a subscriber unit (300) comprises receiving means (305) for receiving uplink characteristics information transmitted from a target set of base stations (201,203). The subscriber unit (300) further comprises base station selection means (309) for determining at least one serving base station in response to said uplink characteristics information, and transmitting means (311) for accessing the cellular communication system through said at least one serving base station. Preferably, the subscriber unit (300) comprises means for calculating an access message transmit power level and the base station having the lowest calculated access message transmit power level is selected. The invention is particularly applicable to 3rdgeneration cellular communication systems such as UMTS. aid pixel number counter and the number of sheets counted by said sheet number counter, and thereafter calculates the printable number of sheets from the present onward. 3. An image forming apparatus according to claim 2, wherein said calculating means estimates a developer amount to be required per unit pixel from the present onward by multiplying the developer amount required per unit pixel in the past by a predetermined weighting factor, and calculates the printable number of sheets from the present onward based on the estimated value of the developer amount to be required per unit pixel from the present onward estimated by said calculation means and the number of pixels required for one sheet of the recording material. 4. An image forming apparatus according to claim 3, wherein said calculating means multiplies a developer amount required per unit pixel in a first past period by a large weighting factor, and multiplies a developer amount required per unit pixel in a second past period by a light weighting factor, wherein the first past period is closer to the present than the second past period, and wherein the large weighting factor is larger than the light weighting factor. 5. An image forming apparatus according to claim 2, wherein said calculating means estimates a developer amount to be required per unit pixel from the present onward by multiplying the developer amount required per unit pixel in the past by a predetermined weighting factor to produce a first estimated value, estimates the number of pixels to be required for one sheet of the recording material from the present onward by multiplying the number of pixels required for one sheet of the recording material in the past by a predetermined weighting factor to produce a second estimated value, and calculates the printable number of sheets from the present onward based on the first and second estimated values. 6. An image forming apparatus according to claim 1, further comprising output means for outputting information regarding the printable number of sheets from the present onward calculated by said calculating means. 7. An image forming apparatus according to claim 6, further comprising display means for displaying the information outputted from said output means. 8. An image forming apparatus according to claim 6, wherein said apparatus is connected to an electronic apparatus having a display, and the information outputted from said output means is indicated on the display. 9. An image forming apparatus according to claim 1, further comprising a memory for storing the developer amount detected by said developer amount detecting means, the number of pixels counted by said pixel number counter, and the number of sheets counted by said sheet number counter. 10. An image forming apparatus according to claim 9, wherein said memory further stores the number of pixels at the time when a detected amount of said developer amount detecting means reaches a predetermined amount, and this number of pixels is information that is not updated. 11. An image forming apparatus according to claim 1, wherein at least said developer container is detachably mountable to said apparatus. 12. An image forming apparatus according to claim 11, further comprising a memory for storing the developer amount detected by said developer amount detecting means, the number of pixels counted by said pixel number counter, and the number of sheets counted by said sheet number counter, wherein said memory forms a unit together with said developer container and said unit is detachably mountable to said apparatus. 13. An image forming apparatus according to claim 12, wherein said unit further comprises at least one of an electrophotosensitive member, charging means for charging said electrophotosensitive member, developing means for supplying the developer to said electrophotosensitive member, and cleaning means for cleaning said electrophotosensitive member. 14. A cartridge detachably mountable on an