Time slot assigning method, signal transmission method, base station control apparatus, base station, and mobile station used in a mobile communications system
First Claim
1. A time slot assigning method of assigning time slots to transmit signals between a base-station and a mobile station in each frame, the method comprising;
- assigning a first slot group to transmit downlink signals from the base station to the mobile station, the first slot group consisting of one or more successive time slots;
assigning a second slot group to receive uplink signals at the base station from the mobile station, the second slot group consisting of one or more successive time slots;
arranging a third slot group consisting of one or more successive time slots immediately after the first slot group,wherein the time slots of the third slot group are used first to continue to transmit downlink signals from the base station when all of the time slots of the first slot group have been used but there are downlink signals awaiting transmission; and
when the transmission of all the downlink signals awaiting transmission is completed and an interference level due to surrounding base stations is detected to be below a prescribed level, remaining time slots of the third slot group are used to receive uplink signals.
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Accused Products
Abstract
A time slot assigning method for assigning a time slot for transmission of a signal between a base station and a mobile station in each frame is provided. The method comprises assigning a first slot group used for transmission of a down signal from the base station to the mobile station; assigning a second slot group used for transmission of an up signal from the mobile station to the base station are assigned; and arranging a third slot group immediately after the first slot group, the third slot group being used giving a priority to transmission of another down signal from the base station to the mobile station.
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Citations
18 Claims
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1. A time slot assigning method of assigning time slots to transmit signals between a base-station and a mobile station in each frame, the method comprising;
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assigning a first slot group to transmit downlink signals from the base station to the mobile station, the first slot group consisting of one or more successive time slots; assigning a second slot group to receive uplink signals at the base station from the mobile station, the second slot group consisting of one or more successive time slots; arranging a third slot group consisting of one or more successive time slots immediately after the first slot group, wherein the time slots of the third slot group are used first to continue to transmit downlink signals from the base station when all of the time slots of the first slot group have been used but there are downlink signals awaiting transmission; and when the transmission of all the downlink signals awaiting transmission is completed and an interference level due to surrounding base stations is detected to be below a prescribed level, remaining time slots of the third slot group are used to receive uplink signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal transmission method for transmitting signals between a base station and a mobile station in a mobile communication system, the method comprising:
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determining a first slot group, a second slot group, and a third slot group in each radio frame, the third slot group being used for multiple purposes, wherein each of the first, second and third slot groups consist of one or more successive time slots, and the time slots of the third slot group are arranged immediately after the time slots of the first slot group; receiving uplink signals at the base station from the mobile station using the second slot group; transmitting downlink signals from the base station to the mobile station using the first slot group; continuing transmitting downlink signals using the third slot group when all of the slots of the first slot group have been used but there are downlink signals awaiting transmission; and switching from transmitting downlink signals to using available slots of the third slot group in receiving uplink signals at the base station from the mobile station only when the transmission of all downlink signals awaiting transmission is completed and an interference level from surrounding base stations is detected to be below a prescribed level. - View Dependent Claims (8, 9)
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10. A base station control apparatus provided between a base station and a mobile station in a mobile communications system, the base station control apparatus comprising:
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a traffic data collecting unit configured to collect traffic data from the base station; and a slot group determination unit configured to assign, in each frame, a first slot group to transmit downlink signals from the base station to the mobile station, a second slot group to receive uplink signals at the base station from the mobile station, and a third slot group being used for multiple purposes, based on the traffic data collected at the traffic data collecting unit, wherein each of the first, second and third slot groups consist of one or more successive time slots, and the time slots of the third slot group are arranged immediately after the time slots of the first slot group, and the base station control apparatus is configured to switch from transmitting downlink signals using the third slot group to receiving uplink signals using the third slot group when the transmission of all the downlink signals awaiting transmission is determined to be completed and it is detected that an interference level due to surrounding base stations is below a prescribed level. - View Dependent Claims (11, 12, 13)
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14. A base station in a mobile communications system, comprising:
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an interface for receiving assignment of time slots for each frame from an external control apparatus, said frame including a first slot group, a second slot group, and a third slot group, wherein each of the first, second and third slot groups consist of one or more successive time slots, and the time slots of the third slot group are arranged immediately after the time slots of the first slot group; a controller connected to the interface and configured to cause the base station to transmit downlink signals to a mobile station using the first slot group, to cause the base station to first use the time slots of the third slot group to transmit downlink signals when all of the time slots of the first slot group have been used but there are downlink signals awaiting transmission, and to cause the base station to receive uplink signals from the mobile station using the second slot group, wherein the controller is configured to receive uplink signals from the mobile station at the base station using remaining time slots of the third slot group after transmission of all downlink signals awaiting transmission is completed, and an interference level from surrounding base stations is detected to be below a prescribed level. - View Dependent Claims (15, 16)
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17. A mobile station comprising:
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a radio frequency processing unit for receiving downlink signals transmitted from a base station using a first slot group in a frame including the first slot group, a second slot group, and a third slot group and for transmitting uplink signals to the base station using the second slot group, wherein each of the first, second and third slot groups consists of one or more successive time slots, and the time slots of the third slot group are arranged immediately after the time slots of the first slot group; a controller configured to cause the radio frequency processing unit to receive downlink signals from the base station using the time slots of the third slot group in the frame when all of the time slots of the first slot group have been used but there are downlink signals awaiting transmission, and to transmit uplink signals to the base station using remaining time slots of the third slot group after transmission of all downlink signals awaiting transmission is completed and an interference level from surrounding base stations is detected to be below a prescribed level; and a signal processing unit configured to set an order of priority for transmission of uplink signals to the base station, wherein the controller causes the radio frequency processing unit to transmit uplink signals of lowest priority using the remaining time slots of the third slot group. - View Dependent Claims (18)
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Specification