Method and apparatus for assigning codes
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorKeijiro Take
Life of this patent
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Abstract
A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.
Claims2
A base station used for a radio communication system employing CDMA (Code Division Multiple Access) for radio access and providing multi-rate transmission, the base station comprising:
- a code switch informing unit for informing that a first code, having been used by one of the plurality of mobile stations, is to be switched to a second code;
- a timing information sending unit for transmitting timing information regarding timing of switching the first code to the second code to the one of the plurality of mobile stations;
- and
- a switching unit for switching the first code to the second code based on the timing information transmitted to the one of the plurality of mobile stations.
A radio communication method of a base station used for a radio communication system employing CDMA (Code Division Multiple Access) for radio access and providing multi-rate transmission, the radio communication method comprising:
- informing that a first code, having been used by one of the plurality of mobile stations, is to be switched to a second code;
- transmitting timing information regarding timing of switching the first code to the second code to the one of the plurality of mobile stations;
- and
- switching the first code to the second code based on the timing information transmitted to the one of the plurality of mobile stations.
Dependencies are inferred from the claim text.