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 radio communication system employing CDMA (Code Division Multiple Access) for radio access and providing multi-rate transmission, the radio communication system comprising:
- a base station controlling apparatus;
- a plurality of base stations;
- and
- a plurality of mobile stations, wherein
- one of (i) the base station controlling apparatus and (ii) the plurality of base stations includes 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,
- one of the plurality of base stations includes 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,
- the one of the plurality of mobile stations includes a code switching unit for switching the first code to the second code, based on the informing by the one of the base station controlling apparatus and the plurality of base stations, and based on the timing information transmitted by the timing information sending unit of the one of plurality of the plurality of the base stations, and
- the one of the plurality of base stations includes a switching unit for switching transmission code from 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 for a radio communication system employing CDMA (Code Division Multiple Access) for radio access and providing multi-rate transmission, the radio communication system including:
- a base station controlling apparatus;
- a plurality of base stations;
- and
- a plurality of mobile stations, 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,
- switching the first code to the second code, based on the informing and the timing information transmitted, at one of the plurality of mobile stations, and
- switching transmission code from the first code to the second code based on the timing information transmitted at one of the plurality of base stations.
Dependencies are inferred from the claim text.