QoS control method for transmission data for radio transmitter and radio receiver using the method

• US 7,274,730 B2
• Filed: 08/25/2003
• Issued: 09/25/2007
• Est. Priority Date: 08/26/2002
• Status: Expired due to Fees

• Current Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Original Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Inventors: Nakabayashi, Sumie
• Primary Examiner(s): PHU, PHUONG M
• Application Number:
  US10/646,769
• Publication Number:
  US 20040038685A1
• Time in Patent Office: 1,492 Days
• Field of Search: 375/219, 375/220, 375/260, 375/261, 375/222, 455/452.1, 455/452.2, 370/334, 370/332
• US Class Current: 375/220
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement

Abstract

A radio transmitter/receiver having a QoS control unit for outputting the transmission data in order taking the quality of service (QoS) into consideration. In the case where the information transmission rate for a radio section is not lower than a threshold value, the QoS control operation of the transmission data is omitted, and the transmission data are output in the order of input. In the case where the information transmission rate for the radio section is lower than the threshold value, on the other hand, the QoS control mode is switched in accordance with the information transmission rate for the radio section.

Claims

1. A Quality of Service (QoS) control system used for a radio transmitter/receiver, comprising:

a QoS control unit for supplying a modulator of said radio transmitter/receiver with transmission data in an order taking QoS into consideration; and

a determining unit connected to said QoS control unit for determining whether a QoS control operation of the transmission data is reguired or not in accordance with information transmission conditions in an associated radio path,

wherein the QoS control operation of the transmission data by said QoS control unit is performed selectively in accordance with the information transmission conditions in the radio transmission path, and

wherein said QoS control unit has a first operation mode for outputting the transmission data in an order of input and a second operation mode for outputting the transmission data in the order taking QoS into consideration, said first and second operation modes being switchable to each other in accordance with the information transmission conditions in said radio path.

2. A QoS control system according to claim 1, wherein said QoS control unit includes a comparator for comparing an information transmission rate for said radio path with a predetermined threshold value, said QoS control unit being switched to said second operation mode if said information transmission rate for said radio path is lower than a predetermined threshold value, said QoS control unit being switched to said first operation mode in the case where said information transmission rate for said radio section is not lower than said predetermined threshold value.

3. A QoS control system according to claim 2, wherein said QoS control unit has a queue unit for outputting the transmission data in the order of input in said first operation mode.

4. A QoS control system according to claim 2, wherein said QoS control unit has a class-wise queue unit for setting the transmission data in a queue in accordance with a class of the transmission data in said second operation mode.

5. A QoS control system according to claim 4, wherein said QoS control unit includes a class-wise band assignment table for setting a guaranteed band for each class and a read control unit for reading the transmission data from said class-wise queue unit in accordance with said class-wise band assignment table.

6. A QoS control system according to claim 1, wherein an information transmission rate for said radio section is obtained from information on specific bits contained in received data.

7. A QoS control system according to claim 1, wherein said QoS control unit has a plurality of QoS control modes, and

wherein the QoS control mode to be applied to transmission data is switched between said plurality of said QoS control modes in accordance with an information transmission rate for said radio transmission path.

8. A QoS control system according to claim 7, wherein said QoS control unit has a QoS control mode table for defining a relation between a range of the transmission rate for said radio transmission path and a QoS control mode applicable to the transmission data, and

wherein said QoS control mode applicable to the transmission data is determined in accordance with the information transmission rate for the radio transmission path with reference to said QoS control mode table.

9. A Quality of Service (QoS) control system used for a radio transmitter/receiver, comprising:

a QoS control unit for supplying a modulator of said radio transmitter/receiver with transmission data in an order taking QoS into consideration; and

a determining unit connected to said QoS control unit for determining whether a QoS control operation of the transmission data is required or not in accordance with information transmission conditions in an associated radio transmission path,

wherein the QoS control operation of the transmission data by said QoS control unit is performed selectively in accordance with the information transmission conditions in the radio transmission path,

wherein said QoS control unit has a plurality of QoS control modes,

wherein a QoS control mode to be applied to the transmission data is switched between said plurality of said QoS control modes in accordance with an information transmission rate for said radio transmission path,

wherein said QoS control unit has a classification table showing correspondence between a class and a specific QoS control mode of said QoS control modes,

wherein said classification table defines a class of each transmission data corresponding to a value of specific header information contained in the transmission data, and

wherein said QoS control unit determines the class of the transmission data in said specific QoS control mode with reference to said classification table.

10. A Quality of Service (QoS) control method for a radio transmitter/receiver, comprising:

a first step of determining whether QoS control of transmission data is required or not in accordance with information transmission conditions in an associated radio path;

a second step of supplying the transmission data to a modulator of said radio transmitter/receiver in an order taking QoS into consideration if QoS control operation is required; and

a third step of supplying the transmission data to a modulator in an order of input if said QoS control operation is not required,

wherein said second step includes the steps of;

determining a class of each transmission data,

setting the transmission data in a class-wise queue corresponding to a determined class, and

reading the transmission data from said class-wise queue in accordance with a class-wise band assignment table with a guaranteed band set for each class.