Channel setting method in mobile communication system

Abstract

The present invention relates to a mobile communication system in which variable bandwidths are set in this manner, and a base station controller for setting these variable bandwidths. A base station controller sends a value indicating a requested bandwidth required for a channel of variable bandwidth to a base station. The base station, upon receiving the request, returns a response of an allocatable bandwidth equal to or lower than the requested bandwidth, to the base station controller. The base station controller, upon receiving the response, sets the channel of variable bandwidth between a mobile station and the base station, and between the base station and the base station controller, according to the allocatable bandwidth.

1 . A method for setting a channel of variable bandwidth between a mobile station and a base station performing radio communications with said mobile station, and between said base station and a base station controller communicating with said base station and controlling said base station, comprising the steps of: 
 in said base station controller, sending a request for a bandwidth required for said channel to said base station;    in said base station, upon receiving said request, returning a response of an allocatable bandwidth equal to or lower than said required bandwidth, to said base station controller; and    in said base station controller, upon receiving said response, setting said channel of variable bandwidth between said mobile station and said base station, and between said base station and said base station controller, according to said allocatable bandwidth.    
   
   
       2 . The channel setting method according to  claim 1 , wherein said base station controller has bandwidth management information for managing the bandwidths of said channels of variable bandwidth for each respective mobile station, and further comprising the step of, after receiving said response, in said base station controller, updating said bandwidth management information for the mobile station for which said variable bandwidth has been set, by setting said allocatable bandwidth in the bandwidth management information thereof.  
   
   
       3 . The channel setting method according to  claim 1 , wherein said base station controller has recommended bandwidths provided for each respective mobile station and recommended to that mobile station, and further comprising the step of, before sending said required bandwidth, in said base station controller, comparing said recommended bandwidth with said required bandwidth and applying the smaller of these bandwidths to said required bandwidth.  
   
   
       4 . The channel setting method according to  claim 3 , wherein said recommended bandwidth is set to a larger value, the higher the priority of bandwidth allocation assigned to each respective mobile station, said priority being calculated by means of the formula,  
       {( T×K   T   +A×K   A )÷( D×K   D   +S×K   S )}× K    
     where T is a use time of said channel of variable bandwidth, D is a dormant number, S is a short-burst data reception/transmission number, A is an allocation reject number of said channel of variable bandwidth, and K, K T , K A , K D , and K S  are weighting coefficients.  
   
   
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       8 . A method for setting a channel of variable bandwidth between a mobile station and a base station performing radio communications with said mobile station, and between said base station and a base station controller which communicates with said base station and controls said base station, said method being performed under control of said base station controller, and comprising the steps of: 
 holding a bandwidth allocation priority for said mobile station and a recommended bandwidth set and recommended with respect to said priority;    setting said channel by comparing said recommended bandwidth with a requested bandwidth for said channel;    if the smaller bandwidth thereof can be ensured, ensuring said smaller bandwidth; and    if said smaller bandwidth cannot be ensured, reducing the bandwidth of a channel established to another mobile station of lower rank of said priority than the mobile station for which said smaller bandwidth is being ensured, and ensuring said smaller bandwidth.    
   
   
       9 . A method for setting a channel of variable bandwidth between a mobile station and a base station performing radio communications with said mobile station, and between said base station and a base station controller which communicates with said base station and controls said base station, said method being performed under control of said base station controller, and comprising the steps of: 
 sending a request for a bandwidth required for said channel to said base station;    receiving a response of an allocatable bandwidth equal to or lower than said required bandwidth, as sent by said base station; and    setting said channel of variable bandwidth between said mobile station and said base station, and between said base station and said base station controller, according to said received allocatable bandwidth.    
   
   
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       12 . A mobile communication system comprising a mobile station, a base station performing radio communications with said mobile station, and a base station controller communicating with said base station and controlling said base station, in which a channel of variable bandwidth is established between said mobile station and said base station, and between said base station and said base station controller, 
 wherein said base station controller comprises:    a transmitting portion for sending a request for a bandwidth required for said channel to said base station;    a first receiving portion for receiving a response of an allocatable bandwidth, sent by said base station in response to the transmission made by said transmitting portion; and    a setting portion for setting said channel between said mobile station and said base station, and between said base station and said base station controller, according to said allocatable bandwidth received by said first receiving portion; and    said base station comprises:    a second receiving portion for receiving said request transmitted by said transmitting portion of said base station controller; and    a response portion for returning said response of said allocatable bandwidth which is equal to or lower than said requested bandwidth received via said second receiving portion, to said base station controller.    
   
   
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       15 . A base station controller for establishing a channel of variable bandwidth between a mobile station and a base station performing radio communications with said mobile station, and between said base station and said base station controller which communicates with said base station and controls said base station, comprising: 
 a transmitting portion for sending a request for a bandwidth required for said channel to said base station;    a receiving portion for receiving a response of an allocatable bandwidth equal to or lower than said requested bandwidth, from said base station; and    a channel setting portion for setting said channel of variable bandwidth between said mobile station and said base station, and between said base station and said base station controller, according to said allocatable bandwidth received by said receiving portion.    
   
   
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       18 . A base station controller for establishing channels of variable bandwidth between a mobile station and a base station performing radio communications with said mobile station, and between said base station and said base station controller communicating with said base station and controlling said base station, comprising: 
 a holding portion for holding a bandwidth allocation priority for said mobile station and a recommended bandwidth set and recommended in accordance with said priority;    a setting portion for comparing said recommended bandwidth with said requested bandwidth, and setting said channel ensuring the smaller of these bandwidths; and    a bandwidth adjusting portion for reducing the bandwidth of said channel established to another mobile station of lower priority than the mobile station for which said smaller bandwidth is to be ensured, if said smaller bandwidth cannot be ensured.