Radio communication apparatus and radio communication method

• US 20080049773A1
• Filed: 08/20/2007
• Published: 02/28/2008
• Est. Priority Date: 08/22/2006
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Adachi, Tomoko, Utsunomiya, Yoriko
• Application Number:
  US11/894,157
• Publication Number:
  US 20080049773A1
• Time in Patent Office: Days
• US Class Current: 370/412
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

A radio communication apparatus includes a first processing unit which performs physical layer protocol processing in order to make a radio communication using at least one first channel having a first frequency bandwidth and a second processing unit which performs physical layer protocol processing in order to make a radio communication using a second channel which has a second frequency bandwidth. The second frequency bandwidth has a bandwidth wider than that of the first frequency band. A transmission frame including either information of a traffic class, a capability of a destination terminal, a recommended bandwidth by the destination terminal, and a time limit to complete transmission of a frame is stored in a queue. A scheduler controls a time when the transmission frame is output from the queue, and which of the first and the second processing units should be used for the output transmission frame, based on the information.

Claims

1. A radio communication apparatus, comprising:

a first processing unit which performs physical layer protocol processing in order to make a radio communication using at least one first channel having a first frequency bandwidth;

a second processing unit which performs physical layer protocol processing in order to make a radio communication using a second channel which has a second frequency bandwidth having a bandwidth wider than that of the first frequency band and overlapping with the first frequency band;

a queue which stores a transmission frame including either information of a traffic class, a capability of a destination terminal, a recommended bandwidth by the destination terminal, and a time limit to complete transmission of a frame; and

a scheduler which controls a time when the transmission frame is output from the queue, and which of the first and the second processing units should be used for the output transmission frame, based on the information.

2. The apparatus according to claim 1, wherein

the queue includes a first queue which outputs the transmission frame to the first processing unit, a second queue which outputs the transmission frame to the second processing unit, and a third queue which outputs the transmission frame to at least one of the first and the second processing units, and

the scheduler includes:

a first scheduler which controls so that the transmission frame is input in either one of the first to third queues; and

a second scheduler which controls so that the transmission frame is output from the first queue or the third queue to be input to the first processing unit in a first period making the radio communication using the first channel, and so that the transmission frame is output from the second queue or the third queue to be input to the second processing unit in a second period making the radio communication using the second channel.

3. The apparatus according to claim 2, further comprising:

a first acquisition unit which acquires a first to a third queue congestion level in each queues, wherein

the first scheduler decides in which of the first queue and the third queue the transmission frame is to be input on the basis of a comparison result between the first congestion level and the third congestion level, and decides in which of the second queue and the third queue the transmission frame is to be input on the basis of a comparison result between the second congestion level and the third congestion level.

4. The apparatus according to claim 3, wherein:

the first congestion level indicates an averaged time from the time when the transmission frame is input in the first queue up to the time when the transmission frame is output;

the second congestion level indicates an averaged time from the time when the transmission frame is input in the second queue up to the time when the transmission frame is output; and

the third congestion level indicates an averaged time from the time when the transmission frame is input in the third queue up to the time when the transmission frame is output.

5. The apparatus according to claim 2, further comprising:

a second acquisition unit which acquires information which can determine whether or not the radio communication using the second channel is permitted at a place at which a basic service set (BSS) is installed, wherein

the first scheduler prohibits the transmission frame to be input in the second queue if the radio communication using the second channel is not permitted.

6. The apparatus according to claim 2, wherein

the first scheduler inputs a transmission frame which has a traffic class with high priority including at least a voice or a video to the third queue, and

the second scheduler outputs the transmission frame from the third queue in priority to the first and the second queues in both the first and the second periods.

7. The apparatus according to claim 2, wherein

the second scheduler compares a first time limit to complete transmission of the frame in the first queue with a second time limit to complete transmission of the frame in the third queue, and

outputs the frame having a shorter time until a time limit to complete transmission of a frame arrives, in priority to the other transmission frame.

8. The apparatus according to claim 7, wherein

the second scheduler further compares a third time limit to complete transmission of the frame in the second queue with a fourth time limit to complete transmission of the frame in the third queue, and

outputs the frame, having a shorter time until a time limit to complete transmission of a frame arrives, in priority to other transmission frame.

9. The apparatus according to claim 8, wherein

the second scheduler obtains a start time of the next first period which starts after the second period following the current first period,

outputs the first transmission frame in priority the second transmission frame if the first time limit to complete transmission of the frame comes earlier than the start time, and

outputs the third transmission frame in priority to the fourth transmission frame if the third time limit to complete transmission of the frame comes earlier than the start time.

10. The apparatus according to claim 2, further comprising:

a third acquisition unit which acquires each congestion level of the first to the third queues, wherein

the first scheduler preferentially inputs the transmission frame in a queue having a lower congestion level.

11. The apparatus according to claim 10, wherein the first scheduler moves the transmission frame from a queue with a higher congestion level to a queue with a lower congestion level.

12. The apparatus according to claim 3, wherein the congestion level is either a number of frames in a queue, a number of total data bites in the queue, a number of frames in the queue/a queue length, a number of total data bites in the queue/a queue length, or empty size of the queue.

13. The apparatus according to claim 9, wherein the congestion level is either a number of frames in a queue, a number of total data bites in the queue, a number of frames in the queue/a queue length, a number of total data bites in the queue/a queue length, or empty size of the queue.

14. The apparatus according to claim 10, wherein the congestion level is either a number of frames in a queue, a number of total data bites in the queue, a number of frames in the queue/a queue length, a number of total data bites in the queue/a queue length, or empty size of the queue.

15. A radio communication method, comprising:

performing physical layer protocol processing for making a radio communication using at least one first channel having a first frequency bandwidth by a first processing unit;

performing physical layer protocol processing for making a radio communication using a second channel which has a second frequency bandwidth having a bandwidth wider than that of the first frequency band and overlapping with the first frequency band by a second processing unit;

storing a transmission frame including information of either a traffic class, a capability of a destination terminal, a recommended bandwidth by the destination terminal, and a time limit to complete transmission of a frame in a queue; and

controlling a time when the transmission frame is output from the queue, and which of the first processing unit and the second processing unit should be supplied the output transmission frame on the basis of the information.