Base station device

Abstract

The invention discloses a base station device. Through the base station device, more than one and less than M sub-channels can be applied to the wireless communication with a wireless terminal in the capacity range of the wireless terminal correspondingly in a first modulation mode capable of performing high-speed wireless communication and a second modulation mode capable of performing low-speed wireless communication. A wireless base station is characterized by comprising a judging part and a notification part, wherein the judging part is used for selecting a second combination when a necessary sending output of the second combination is smaller than a necessary sending output of a first combination under the condition that both the first combination and the second combination meet a required communication speed; the first combination consists of the first modulation mode and the number N of the sub-channels, the second combination consists of the second modulation mode and the number N' of the sub-channels, N is more than or equal to 1 and less than or equal to M, and N' is more than or equal to 1 and less than or equal to M; and the notification part notifies the selected combination to the wireless terminal.

Description

[0001] This application is a divisional application of an invention patent application with an application date of September 29, 2006, an application number of 200680055958.4, and an invention title of "base station device". technical field [0002] The present invention relates to a method for allocating subchannels in order to expand the communication area in a communication system that divides a used frequency band into a plurality of subchannels and allocates one or more subchannels to a plurality of mobile stations like OFDMA (Orthogonal Frequency Division Multiplexing Acces). For the purpose of improving communication capacity and reducing power consumption of mobile stations, subchannels are assigned according to the radio environment (radio wave propagation environment), specifications, and requested communication speed of each mobile station. Background technique [0003] In the OFDMA communication scheme, in the downlink, the base station uses all available frequenc...

AI Technical Summary

Problems solved by technology

[0013] For example, if the assignment of subchannels is inappropriate and the mobile station is assigned more than necessary subchannels for the specified modulation scheme and coding rate, the power spectral density transmitted from the mobile station will decrease, which cannot satisfy the requirements for The communication quality required for the modulation method and coding rate specified by the base station

On the contrary, when a relatively small number of sub-channels is allocated, the maximum user communication speed that could have been achieved will not be achieved

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