Wireless communication system and wireless communication method

• US 8,175,044 B2
• Filed: 01/30/2008
• Issued: 05/08/2012
• Est. Priority Date: 02/06/2007
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Fujitsu Limited, NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Seki, Hiroyuki, Kimura, Dai, Shimomura, Tsuyoshi, Ishii, Hiroyuki, Kishiyama, Yoshihisa, Higuchi, Kenichi, Abeta, Sadayuki
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): MENSAH, PRINCE AKWASI
• Application Number:
  US12/010,848
• Publication Number:
  US 20080186880A1
• Time in Patent Office: 1,560 Days
• Field of Search: 370/203, 370/206, 370/208, 370/310, 370/329, 370/330, 370480-482, 370/395.4, 370/395.41, 370/395.43, 370/412, 370/230.1, 455/63.1, 455/73, 455/410, 455/434, 455/438, 455/450, 455/452.2, 455/500, 455/501, 455/509, 455/522, 455/525, 455/561
• US Class Current: 370/329
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

The present invention is a wireless communication system having a mobile station and a wireless base station, wherein the wireless base station further having a scheduling processing unit which divides system bandwidth into a plurality of wireless resource blocks in a frequency domain, performs scheduling so that other channels are not assigned to the wireless resource blocks which are adjacent to a first channel when the first channel whose frequency characteristic is not orthogonal to the other channels is assigned to a certain wireless resource block resulting from the division, and creates scheduling information on the scheduling that is performed; and a transmission unit which transmits the scheduling information created by the scheduling processing unit to the mobile station, and the mobile station transmits a channel signal to the wireless base station on the basis of the scheduling information and the wireless base station receives the channel signal transmitted from the mobile station.

Claims

1. A wireless communication system comprising:

a mobile station; and

a wireless base station, wherein

the wireless base station further comprising a scheduler which divides system bandwidth into a plurality of wireless resource blocks, each of which has a same predetermined bandwidth, in a frequency domain, performs scheduling so that, when a first channel whose frequency characteristic is not orthogonal to other channels is assigned to a certain wireless resource blocks resulting from the division the other channels are not assigned to the wireless resource blocks which are adjacent the certain wireless resource blocks, and creates scheduling information on the scheduling that is performed; and

a transmission unit which transmits the scheduling information created by the scheduler to the mobile station,

the mobile station transmits a channel signal to the wireless base station on the basis of the scheduling information and the wireless base station receives the channel signal transmitted from the mobile station, and;

the scheduler performs scheduling so that the channels which have a transmission rate equal to or more than a threshold value are not assigned to the wireless resource blocks which are adjacent to the first channel.

2. The wireless communication system according to claim 1, wherein the first channel is a random access channel.

3. The wireless communication system according to claim 1, wherein the transmission rate is a value that is calculated from a modulation order and a coding rate on the basis of the channel transmitted from the mobile station.

4. The wireless communication system according to claim 1, wherein the scheduler performs scheduling so that the channels which have a transmission rate equal to or less than a threshold value are not assigned to the wireless resource blocks which are adjacent to the first channel, when the base station is performing transmission power control with respect to the mobile station.

5. The wireless communication system according to claim 1, wherein the scheduler performs scheduling so that the channels which require a low delay characteristic are not assigned to the wireless resource blocks which are adjacent to the first channel.

6. The wireless communication system according to claim 5, wherein the channels which require the low delay characteristic are packet data for real-time services including sound or games.

7. The wireless communication system according to claim 1, wherein the scheduler performs scheduling so that channels of a narrow bandwidth are not assigned to the wireless resource blocks which are adjacent to the first channel.

8. The wireless communication system according to claim 7, wherein the scheduler performs scheduling so that the channels of the narrow bandwidth are not assigned by ensuring that the wireless resource blocks which are adjacent to the first channel are not assigned when the proportion of the wireless resource blocks which are adjacent to the first channel among the assigned wireless resource blocks is equal to or more than a threshold value.

9. A wireless communication method in a wireless communication system having a mobile station and a wireless base station, comprising:

dividing system bandwidth into a plurality of wireless resource blocks, each of which has a same predetermined bandwidth, in a frequency domain, performs scheduling so that, when a first channel whose frequency characteristic is not orthogonal to other channels is assigned to a certain wireless resource blocks resulting from the division the other channels are not assigned to the wireless resource blocks which are adjacent to the certain wireless resource blocks, and creating scheduling information on the scheduling that is performed, by the wireless base station;

transmitting the scheduling information to the mobile station, by the wireless base station; and

transmitting a channel signal to the wireless base station on the basis of the scheduling information by the mobile station and receiving the channel signal transmitted from the mobile station by the wireless base station, wherein

the scheduler performs scheduling so that the channels which have a transmission rate equal to or more than a threshold value are not assigned to the wireless resource blocks which are adjacent to the first channel.