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Transmission and reception bandwidth setting method, mobile terminal, and base station in radio communication system defining a plurality of signal bandwidths

Transmission and reception bandwidth setting method, mobile terminal, and base station in radio communication system defining a plurality of signal bandwidths description/claims

The present invention relates to a base station, a mobile terminal, and a signal transmission and reception method used in a radio communication system in which a plurality of different signal bandwidths are defined.

As a successor of W-CDMA and HSDPA, a communication scheme called Evolved UTRA (E-UTRA) is being studied. The E-UTRA is a radio access scheme that supports a plurality of bandwidths in an extensible manner, and that supports bandwidths from 1.25 MHz up to 20 MHz while maintaining compatibility with the existing 3G scheme.

In the existing W-CDMA, a single bandwidth of 5 MHz is supported in a same system, channels of uplink (from base station to terminal) and downlink (terminal to base station) are allocated so that data to be transferred is transmitted.

In contrast, in a system corresponding to E-UTRA, a plurality of bandwidths are defined in a same system, and different bandwidths are supported according to base stations or carriers. That is, a state occurs in which bandwidths being used are different according to systems (cells in a system of a same carrier under certain circumstances) provided by each carrier. In such a state, it is necessary that every mobile terminal can connect to any base stations having different bandwidths.

In addition, a maximum transmission and reception bandwidth that the mobile terminal can support at a minimum is an important problem since it has an influence not only on implementation and configuration of the terminal but also on configuration of a physical channel corresponding to a synchronization channel (SCH) or a broadcast channel (BCH).

In addition, it becomes important to set transmission bandwidths of a collision permissible channel used when initially accessing any base stations, from the mobile terminal, that use different bandwidths, and a pilot channel and a data channel that are transmitted from the mobile terminal to any base station.

Thus, an object of the present invention is to provide a method for setting a proper bandwidth in a downlink and a method for setting a proper bandwidth in an uplink in a radio communication system in which a plurality of bandwidths are defined.

In addition, an object is to provide configuration of the mobile terminal and configuration of the base station according to the bandwidth setting method.

To realize the above-mentioned object, on the premise that a plurality of bandwidths are defined in a radio communication system, the present invention provides a reception bandwidth setting method of a common channel in a downlink, a transmission bandwidth setting method of a pilot channel and a data channel in an uplink, the scheduling, and a transmission bandwidth setting method of a collision permissible channel in an uplink, for each of the following cases:

(1) A case in which mobile terminals of all kinds corresponding to the plurality of bandwidths are prepared; and

(2) A case in which a maximum bandwidth equal to or greater than a given value is set to every mobile terminal.

In a first aspect, as a first method for setting a bandwidth of a common channel in a downlink, a method for setting a transmission and reception bandwidth in a radio communication system defining a plurality of bandwidths is provided, and the method includes:

(a) accommodating mobile terminals of kinds respectively corresponding to the plurality of bandwidths to the radio communication system; and

(b) setting a minimum transmission bandwidth of the plurality of bandwidths as a transmission bandwidth of a downlink common channel.

As a second method, a method for setting a transmission and reception bandwidth in a radio communication system defining a plurality of bandwidths is provided, and the method includes:

(a) providing a processing capability of a bandwidth equal to or greater than a predetermined value to every mobile terminal accommodated in the radio communication system; and

(b) setting equal to or greater than two transmission bandwidths equal to or less than the predetermined value as transmission bandwidths of a downlink common channel.

In a second aspect, as a first method for setting bandwidths of a pilot channel and a data channel in an uplink, a method for setting a transmission and reception bandwidth in a radio communication system defining a plurality of bandwidths is provided, and the method includes:

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