Radio communication system, radio transmission apparatus, and resource allocation method
View Patent ↗Provided is a resource allocation method capable of improving a reception quality when connecting a plurality of sub frames into one frame and performing a communication process for each of the frames. In this method, when a sub frame # 1 is transmitted, LRB is selected as a resource allocation format according to CQI fed back from a mobile station and RB having a preferable propagation quality is allocated for transmission data according to the LRB format. When a sub frame # 2 is transmitted, the same resource allocation method (LRB) as the head sub frame is used and the transmission data is allocated for the same RB. When a sub frame # 3 is transmitted, the resource allocation method is switched from the sub frame # 1 and the sub frame # 2 and the transmission data is allocated for RB by using the DRB format.
1. A radio transmitting apparatus in which a connection subframe connecting a plurality of subframes is used as one unit in transmission processing, the radio transmitting apparatus comprising:
a selecting section that selects, per sub frame, a localized resource block scheme or a distributed resource block scheme as a resource allocation scheme; and
an allocating section that allocates data in the connection subframe to frequency resources per subframe according to the selected resource allocation scheme; and
a reporting section that reports, to a radio receiving apparatus, control information indicating a timing for switching the resource allocation scheme from the localized resource block scheme to the distributed resource block scheme,
wherein the selecting section switches the resource allocation scheme from the localized resource block scheme to the distributed resource block scheme in the connection subframe, and determines a timing for switching the resource allocation scheme from the localized resource block scheme to the distributed resource block scheme based on a delay time from a timing of receiving a channel quality indicator from the radio receiving apparatus or based on a moving speed of the radio receiving apparatus.
2. The radio transmitting apparatus according to claim 1 , wherein when the resource allocation scheme is the distributed resource block scheme, the allocating section distributes the frequency resources in a greater range in later subframes.
3. The radio transmitting apparatus according to claim 1 , wherein when the resource allocation scheme is the distributed resource block scheme, the allocating section makes the frequency resources to which the data is allocated different between subframes.
4. The radio transmitting apparatus according to claim 1 , further comprising:
a table that is common between the radio transmitting apparatus and the radio receiving apparatus and that stores a plurality of resource allocation methods of the localized resource block scheme and a plurality of resource allocation methods of the distributed resource block scheme, in association with each other one-on-one, wherein
said reporting section reports, to the radio receiving apparatus, the control information indicating a resource allocation method out of the plurality of resource allocation methods of the localized resource block scheme.
5. The radio transmitting apparatus according to claim 1 , wherein when switching is requested from the radio receiving apparatus, the selecting section switches the resource allocation scheme from the localized resource block scheme to the distributed resource block scheme.
6. The radio transmitting apparatus according to claim 5 , wherein when a channel quality indicator is fed back from the radio receiving apparatus at a predetermined timing, the selecting section determines that the switching is requested.
7. A communication terminal apparatus comprising the radio transmitting apparatus according to claim 1 .
8. A base station apparatus comprising the radio transmitting apparatus according to claim 1 .
9. A resource allocation method using a connection subframe connecting a plurality of subframes as one unit in communication processing, the method comprising:
selecting, per subframe, a localized resource block scheme or a distributed resource block scheme as a resource allocation scheme; and
allocating data in the connection subframe to frequency resources per subframe according to the selected resource allocation scheme,
wherein a resource allocation scheme is switched from a localized resource block scheme to a distributed resource block scheme in the connection subframe, control information indicating a timing for switching the resource allocation scheme from the localized resource block scheme to the distributed resource block scheme is reported to a radio receiving apparatus, and a timing for switching the resource allocation scheme from the localized resource block scheme to the distributed resource block scheme is determined based on a delay time from a timing of receiving a channel quality indicator from the radio receiving apparatus or based on a moving speed of the radio receiving apparatus.