Mobile radio communication system and channel control method therefor
AssigneeNEC Corporation
InventorTadao Hashimoto
Life of this patent
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Abstract
In a mobile radio communication system, a mobile station has a field level decision section which outputs a decision signal when the electric field level of a received signal exceeds a threshold level. A controller sequentially sets a plurality of different threshold levels. In response to the decision signal from the decision section, synchronization to the received control signal begins. When the mobile station receives down-going control signals from a plurality of base stations, it selects the one having the highest field level, and then sets up synchronization to the signal selected.
Claims5
In a mobile radio communication system having a plurality of base stations and a plurality of mobile stations, said plurality of base stations each sending a down-going control signal at a predetermined period over a same radio channel implemented as a time division multiplex transmission path, said plurality of mobile stations each performing a waiting procedure at a period synchronous to the down-going control signal detected to thereby receive control data from any one of said plurality of base stations, said plurality of mobile stations each comprising:
- a threshold setting section for storing a threshold electric field level;
- a controller for setting the threshold electric field level, from a plurality of threshold electric field levels, in said threshold setting;
- a field level decision section for outputting a decision signal when a received electric field level of a received signal exceeds the threshold electric field level stored in said threshold setting section;
- and
- a demodulating section for starting, in response to said decision signal, a procedure for setting up synchronization to the down-going control signal included in the received signal.
A channel control method for a mobile radio communication system having a plurality of base stations and a plurality of mobile stations, said plurality of base stations each sending a down-going control signal at a predetermined period over a same radio channel implemented as a time division multiplex transmission path, said plurality of mobile stations each performing a waiting procedure during a period synchronous to the down-going control signal detected to thereby receive control data from any one of said plurality of base stations, comprising the steps of:
- receiving down-going control signals;
- executing, when a received electric field level of a received signal exceeds a threshold electric field level, a procedure for setting up synchronization to a down-going control signal included in the received signal, and detecting the received electric field level;
- and
- executing a waiting procedure during a period synchronous to a down-going control signal having the highest received electric field level as determined on the basis of a plurality of threshold electric field levels in order to receive control data.
A program for controlling synchronization of a mobile communication unit, comprising the steps of:
- setting a first threshold value;
- receiving a first control signal transmitted from a first base station and determining received electric field level of the first control signal;
- if the electric field level of the first control signal exceeds the first threshold value, setting up synchronization to the first control signal and replacing the first threshold value with a second threshold value higher than the first threshold value;
- receiving a second control signal transmitted from a second base station and determining received electric field level of the second control signal;
- and,
- if the electric field level of the second control signal exceeds the second threshold value, setting up synchronization to the second control signal.
Dependencies are inferred from the claim text.