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| Multiple bit output dynamic random-access memory |
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| Autonomous N-modular redundant fault tolerant clock system |
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| Expandable digital error detection and correction device |
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| Automated safestore stack generation and move in a fault tolerant central processor |
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| Method and circuitry arrangement for refreshing data stored in a dynamic MOS memory |
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| Refresh operation control circuit for semiconductor device |
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Method and apparatus for assigning codes
| Details |
Inventors: Take, Keijiro;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Ngo; Ricky
Assistant Examiner: Phan; Tri H.
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
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 from the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at a higher 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. |
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DETAILED DESCRIPTION According to one aspect of the present invention, a code assigning apparatus used in a radio communication system including a base station controlling apparatus, a plurality of base stations, and a plurality of mobile stations, employing CDMA (Code Division Multiple Access) method, which uses codes of tree structured orthogonal multi-spreading factor sequences as spreading codes, for radio access between the plurality of base stations and the plurality of mobile stations, and providing multi-rate transmission between the plurality of mobile stations and the plurality of base stations, the code assigning apparatus comprises a code selecting unit for selecting an assignable code which suits specifications requested by a new starting call and exists in a location as close to a not-assignable code as possible and in a level lower than the not-assignable code in the tree structure.
According to another aspect of the present invention, the code selecting unit of the code assigning apparatus comprises a first selecting unit for selecting one or more than one codes corresponding to rate information included in a message from one of the plurality of mobile stations, as first codes, a second selecting unit for selecting one or more than one first codes if they are assignable to the one of the plurality of mobile stations, as second codes, a level detecting unit for retrieving codes upper than the second codes one by one, detecting not-assignable codes, which are assigned to another of the plurality of mobile stations, out of the codes upper than the second codes, as third codes, and detecting each level of the third codes, a third selecting unit for selecting one of the second codes whose upper third code is in a lowest level in the tree structure, and a code assigning unit for assigning the one of the second codes selected by the third selecting unit to the one of the plurality of mobile stations.
According to another aspect of the present invention, the code assigning apparatus comprises a code-switching/code-assignment processing unit, when there is no assignable code which suits specifications requested by a new starting call, for making a code which is not-assignable and suits the specifications requested by the new starting call assignable by way of switching an assigned code being used to another code connected by a branch different from a branch used for the assigned code in the tree structure
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Fault Detection 
