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An object of the present invention is to provide a packet transfer method and system adapted to minimize delay in data and discard of data in a mobile communication system, and thus to provide improvements in processing ability and service quality in a base station and a switching center. A packet t

An object of the present invention is to provide a packet transfer method and system adapted to minimize delay in data and discard of data in a mobile communication system, and thus to provide improvements in processing ability and service quality in a base station and a switching center. A packet transfer method in a mobile communication system according to the present invention, the mobile communication system having a wire line for interconnecting a base station and a switching center, the wire line including a shared channel and a dedicated channel in which the shared channel can be shared by multiple terminals, while the dedicated channel can be used by only one of the terminals, and when a quantity of data transferred from the terminal is equal to or greater than a predetermined value, then the packet transfer method allocating the dedicated channel to the terminal, comprising that, in data transfer through the dedicated channel, when the data transferred from the terminal is waited because of an excessive quantity of transferred data, and further when a queuing data quantity of the data is equal to or greater than a predetermined delay data quantity-generating value, then another dedicated channel is allocated to the terminal, thereby transferring the data through the dedicated channel and such an additional dedicated channel until the queuing data quantity is equal to or less than a predetermined delay data quantity-restoring value.

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1. A packet transfer method in a communication system including a plurality of terminals, a base station connected to said plurality of terminals via wireless lines, and a switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared chan

1. A packet transfer method in a communication system including a plurality of terminals, a base station connected to said plurality of terminals via wireless lines, and a switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer method comprising:permitting data transferred from said plurality of terminals to be transferred by representing said data by a certain length, andwhen a quantity of data transferred from a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then said a plurality of allocating said dedicated channel to said given terminal, thereby permitting said given data transferred from said terminal to be transferred through said dedicated channel,said packet transfer method further comprising:in data transfer through said dedicated channel that is allocated to said given terminal, when said data transferred from said given terminal is waited because of an excessive quantity of transferred data, and further when a queuing data quantity of said data is equal to or -greater than a predetermined delay data quantity-generating value, then allocating an additional dedicated channel to said given terminal, thereby transferring said data through said dedicated channel and said additional dedicated channel until said queuing data quantity is equal to or less than a predetermined delay data quantity-restoring value. 2. A packet transfer method as defined in claim 1, wherein:(a) said base station determines whether said queuing data quantity of data transferred from said given terminal is equal to or greater than said delay data quantity-generating value, and when such a determination is true, then said base station requests said switching center to allocate said additional dedicated channel to said given terminal;(b) said switching center determines upon receipt of said request from said base station whether said additional dedicated channel can be allocated to said given terminal, and then said switching center delivers a result of such a determination to said base station; and,(c) said base station allocates said additional dedicated channel to said given terminal upon receipt of positive result of said determination from said switching center. 3. A packet transfer method as defined in claim 1, wherein:(a) said base station determines whether said queuing data quantity of data transferred from said given terminal is equal to or less than said delay data quantity-restoring value, and when such a determination is true, then said base station requests said switching center to free said additional dedicated channel from said given terminal;(b) said switching center determines upon receipt of said request from said base station whether said additional dedicated channel already allocated to said given terminal can be released from said given terminal, and then said switching center conveys a result of such a determination to said base station; and,(c) said base station releases said additional dedicated channel from said given terminal upon receipt of positive result of said determination from said switching center. 4. A packet transfer method as defined in claim 1, wherein said delay data quantity-generating value and said delay data quantity-restoring value are individually set according to a number of calls. 5. A packet transfer method in a communication system including a plurality of terminals, a base station connected to said plurality of terminals via wireless lines, and a switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, w hile said dedicated channel can be used by only one of said plurality of terminals,said packet transfer method comprising:permitting data transferred from said plurality of terminals to be transferred by separating said data by a certain length, and only when a quantity of data transferred to a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then allocating said dedicated channel to said given terminal, thereby permitting transferred data from said given terminal to be transferred through said dedicated channel,said packet transfer method further comprising:in said dedicated channel allocated to said given terminal, when data transferred to said given terminal is waited because of an excessive quantity of transferred data, and further when a queuing data quantity of said data is equal to or greater than a predetermined delay data quantity-generating value, then an additional dedicated-channel is allocated to said given terminal, thereby transferring said data through said additional dedicated channel until said queuing data quantity is equal to or less than a predetermined delay data quantity-restoring value. 6. A packet transfer method as defined in claim 5, wherein:(a) said switching center determines whether a queuing data quantity of data transferred to said given terminal is equal to or greater than said delay data quantity-generating value, and when such a determination is true, then said switching center requests said base station to allocate said additional dedicated channel to said given terminal;(b) said base station determines upon receipt of such a request from said switching center whether said additional dedicated channel can be allocated to said given terminal, and then said base station delivers result of such a determination to said switching center; and,(c) said switching center allocates said additional dedicated channel to said given terminal upon receipt of positive result of said determination from said base station. 7. A packet transfer method as defined in claim 5, wherein:(a) said switching center determines whether a queuing data quantity of data transferred to said given terminal is equal to or less than said delay data quantity-restoring value, and when such a determination is true, then said switching center requests said base station to release said additional dedicated channel from said given terminal;(b) said base station determines upon receipt of such a request from said switching center whether said additional dedicated channel allocated to said given terminal can be released from said given terminal, and then said base station conveys result of such a determination to said switching center; and,(c) said switching center releases said additional dedicated channel from said given terminal upon receipt of positive result of said determination from said base station. 8. A packet transfer method as defined in claim 5, wherein said delay data quantity-generating value and said delay data quantity-restoring value are individually set according to a number of calls. 9. A packet transfer method in a communication system including a plurality of terminals, a base station connected to said plurality of terminals via wireless lines, and a switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer method comprising:permitting data transferred from said plurality of terminals to be transferred by representing said data by a certain length, andwhen a quantity of data transferred from a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then said a plurality of allocating said dedicated channel to said given terminal, thereby permitting said given data transferred from said terminal to be transferred through said dedicated channel,said packet transfer method further comprising:in said dedicated channel exclusively allocated to said given terminal, when data transferred from said given terminal is waited because of an excessive quantity of transferred data, and further when a queuing data quantity of said data is equal to or greater than a delay data quantity-generating value, then a given terminal ID is provided to said transferred data in order to prevent said queuing data quantity from being equal to or greater than said delay data quantity-generating value, thereby transferring data through said shared channel. 10. A packet transfer method as defined in claim 9, wherein said delay data quantity-generating value can be set according to a number of calls. 11. A packet transfer method in a communication system including a plurality of terminals, a base station connected to said plurality of terminals via wireless lines, and a switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer method comprising:permitting data transferred from said plurality of terminals to be transferred by representing said data by a certain length, andwhen a quantity of data transferred from a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then said a plurality of allocating said dedicated channel to said given terminal, thereby permitting said given data transferred from said terminal to be transferred through said dedicated channel,said packet transfer method further comprising:in said dedicated channel exclusively allocated to said given terminal, when data transferred to said given terminal is waited because of an excessive quantity of transferred data, and further when a queuing data quantity of said data is equal to or greater than a delay data quantity-generating value, then a given terminal ID is provided to said transferred data in order to prevent said queuing data quantity from being equal to or greater than said delay data quantity-generating value, thereby transferring data through said shared channel. 12. A packet transfer method as defined in claim 11, wherein said delay data quantity-generating value can be set according to a number of calls. 13. A packet transfer system includinga plurality of terminals,a base station connected to said plurality of terminals via wireless lines, anda switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer system operative for permitting data transferred from said plurality of terminals to be transferred separating said data by a certain length in a state of a sequence number being provided to said data, andonly when a quantity of data transferred to a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then allocating said dedicated channel to said given terminal, thereby permitting transferred data from said given terminal to be transferred through said dedicated channel,said base station including:a measurement for means permitting a queuing data quantity of data transferred from said given terminal to be counted for each dedicated channel;a mode-switching means for switching between a single channel mode and a multi-channel mode, said single channel mode permitting said dedicated channel to be applied to said given terminal, said multi-channel mode permitting said dedicated channel and an additio nal dedicated channel to be applied together to said given terminal;a control means for comparing a count value obtained by said measurement means with a predetermined delay data quantity-generating value, and then providing control to switch said mode-switching means from said single channel mode into said multi-channel mode when said count value is greater than said delay data quantity-generating value based on result of such a comparison, said control means further comparing a count value obtained by said measurement means with a predetermined delay data quantity-restoring value, and then providing control to switch said mode-switching means from said multi-channel mode into said single channel mode when said count value is equal to or less than said delay data quantity-restoring value based on result of such a comparison;a rearrangement means for permitting data to said given terminal to be rearranged in order of a sequence number upon receipt of said data when said mode-switching means switches from said single channel mode into said multi-channel mode;a multi-receiving control means for requesting said switching center to resend data having an expected sequence number when such data needs to be resent from said switching center to said base station because said base station does not receive said data from said switching center after a certain period of time has elapsed; and,a multi-receiving release means for confirming absence of transferred data through said additional dedicated channel when said mode-switching means switches from said multi-channel mode into said single channel mode. 14. A packet transfer system as defined in claim 13, wherein said delay data quantity-generating value and said delay data quantity-restoring value are individually set according to a number of calls. 15. A packet transfer system includinga plurality of terminals,a base station connected to said plurality of terminals via wireless lines, anda switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer system operative for permitting data transferred from said plurality of terminals to be transferred separating said data by a certain length in a state of a sequence number being provided to said data, andonly when a quantity of data transferred to a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then allocating said dedicated channel to said given terminal, thereby permitting transferred data from said given terminal to be transferred through said dedicated channel,said switching center including:a measurement means for permitting a queuing data quantity of data transferred to said given terminal to be counted for each dedicated channel;a mode-switching means for switching between a single channel mode and a multi-channel mode, said single channel mode permitting said dedicated channel being applied tosaid given terminal, said multi-channel mode permitting said dedicated channel and an additional dedicated channel to be applied together to said terminal;a control means for comparing a count value obtained by said measurement means with a predetermined delay data quantity-generating value, and then permitting said mode-switching means to switch from said single channel mode into said multi-channel mode based on result of such a comparison, said control means further comparing a count value obtained by said measurement means with a predetermined delay data quantity-restoring value, and then permitting said mode-switching means to switch from said multi-channel mode into said single channel mode based on result of such a comparison;a rearrangement means for permitting data from said terminal to be rearranged in order of a s equence number upon receipt of said data when said mode-switching means switches from said single channel mode into said multi-channel mode;a multi-receiving control means for requesting said base station to resend data having an expected sequence number when such data needs to be resent from said base station to said switching center because said switching center does not receive said data from said base station after a certain period of time has elapsed; and,a multi-receiving release means for confirming absence of transferred data through said additional dedicated channel when said mode-switching means switches from said multi-channel mode into said single channel mode. 16. A packet transfer system as defined in claim 15, wherein said delay data quantity-generating value and said delay data quantity-restoring value are individually be set according to a number of calls. 17. A packet transfer system includinga plurality of terminals,a base station connected to said plurality of terminals via wireless lines, anda switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer system operative for permitting data transferred from said plurality of terminals to be transferred separating said data by a certain length in a state of a sequence number being provided to said data, andwhen a quantity of data transferred to a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then allocating said dedicated channel to said given terminal, thereby permitting said data transferred from said given terminal to be transferred through said dedicated channel,said base station including:a measurement means for permitting a queuing data quantity of data transferred from said given terminal to be counted for each dedicated channel;a rearrangement means for permitting data to be rearranged in order of a sequence number in order to allow for multi-receiving of said dedicated channel and said shared channel, even when said single dedicated channel is used; and,a multi-receiving control means for requesting said switching center to resend data having an expected sequence number when such data needs to be resent from said switching center to said base station because said base station does not receive said data from said switching center after a certain period of time has elapsed. 18. A packet transfer system includinga plurality of terminals,a base station connected to said plurality of terminals via wireless lines, anda switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer system operative for permitting data transferred from said plurality of terminals to be transferred separating said data by a certain length in a state of a sequence number being provided to said data, andwhen a quantity of data transferred to a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then allocating said dedicated channel to said given terminal, thereby permitting said data transferred from said given terminal to be transferred through said dedicated channel,said switching center including:a measurement means for permitting a queuing data quantity of data transferred to said terminal to be counted for each dedicated channel;a rearrangement means for permitting data to be rearranged in order of a sequence number in order to allow for multi-receiving of said dedicated channel and said shared channel, even when said single dedicated chan nel is used; and,a multi-receiving control means for requesting said base station to resend data having an expected sequence number when such data needs to be resent from said base station to said switching center because said switching center does not receive said data from said base station after a certain period of time has elapsed. 19. A packet transfer system includinga plurality of terminals,a base station connected to said plurality of terminals via wireless lines, anda switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer system operative for permitting data transferred from said plurality of terminals to be transferred separating said data by a certain length in a state of a sequence number being provided to said data, andonly when a quantity of data transferred to a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then allocating said dedicated channel to said given terminal, thereby permitting transferred data from said given terminal to be transferred through said dedicated channel,said base station including:a measurement for means permitting a queuing data quantity of data transferred from said given terminal to be counted for each dedicated channel;a mode-switching means for switching between a single channel mode and a multi-channel mode, said single channel mode permitting said dedicated channel to be applied to said given terminal, said multi-channel mode permitting said dedicated channel and an additional dedicated channel to be applied together to said given terminal;a control means for comparing a count value obtained by said measurement means with a predetermined delay data quantity-generating value, and then providing control switch said mode-switching means from said single channel mode into said multi-channel mode when said count value is greater than said delay data quantity-generating value based on result of such a comparison, said control means further comparing a count value obtained by said measurement means with a predetermined delay data quantity-restoring value, and then providing control to switch said mode-switching means from said multi-channel mode into said single channel mode when said count value is equal to or less than said delay data quantity-restoring value based on result of such a comparison;a rearrangement means for permitting data to said given terminal to be rearranged in order of a sequence number upon receipt of said data when said mode-switching means switches from said single channel mode into said multi-channel mode;a multi-receiving control means for requesting said switching center to resend data having an expected sequence number when such data needs to be resent from said switching center to said base station because said base station does not receive said data from said switching center after a certain period of time has elapsed; and,a means for permitting data to said terminal to be rearranged in order of a sequence number upon receipt of said data during said multi-channel mode, and then sending such rearranged data to said terminal. 20. A packet transfer system includinga plurality of terminals,a base station connected to said plurality of terminals via wireless lines, anda switching center linked to said base station via a plurality of wire lines, said plurality of wire lines including a shared channel and a dedicated channel in which said shared channel can be shared by said plurality of terminals, while said dedicated channel can be used by only one of said plurality of terminals,said packet transfer system operative for permitting data transferred from said plurality of terminals to be transferred separating said data by a certain length in a state of a sequence number being provided to said data, andonly when a quantity of data transferred to a given terminal of said plurality of terminals is equal to or greater than a predetermined value, then allocating said dedicated channel to said given terminal, thereby permitting transferred data from said given terminal to be transferred through said dedicated channel,said switching center including:a measurement means for permitting a queuing data quantity of data transferred to said given terminal to be counted for each dedicated channel;a mode-switching means for switching between a single channel mode and a multi-channel mode, said single channel mode permitting said dedicated channel to be applied to said terminal, said multi-channel mode permitting said dedicated channel and an additional dedicated channel to be applied to said terminal;a control means for comparing a count value obtained by said measurement means with a predetermined delay data quantity-generating value, and then permitting said mode-switching means to switch from said single channel mode into said multi-channel mode based on result of such a comparison, said control means further comparing a count value obtained by said measurement means with a predetermined delay data quantity-restoring value, and then permitting said mode-switching means to switch from said multi-channel mode into said single channel mode based on result of such a comparison; and,a means permitting data from said terminal to be rearranged in order of a sequence number upon receipt of said data during said multi-channel mode, and then sending such rearranged data to a telephone network.