Adaptive wireless parameter control method, QoS control device and wireless communication system

• US 20030161323A1
• Filed: 02/27/2003
• Published: 08/28/2003
• Est. Priority Date: 02/28/2002
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Abeta, Sadayuki, Sawahashi, Mamoru, Harada, Atsushi
• Granted Patent: US 7,616,658 B2
• Time in Patent Office: Days
• US Class Current: 370/395.21
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 12/5692 Selection among different networks
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 28/24 Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]

Abstract

A QoS information identification unit receives a packet to be transmitted and based on QoS information, identifies the QoS type of the packet, and outputs the obtained QoS type to an adaptive wireless parameter controller as requested QoS information. The adaptive wireless parameter controller adaptively defines a retransmission parameter, an encoding scheme and a modulation scheme, based on the requested QoS information received from the QoS information identification unit, observed QoS information at the receiving side notified from the receiving side, and transmission path information. A transmission sequencing controller performs retransmission control for the packet based on the retransmission parameter defined therebefore. A data encoder encodes the packet based on the encoding scheme defined therebefore. A data modulator modulates the packet based on the modulation scheme defined therebefore.

Claims

1. An adaptive wireless parameter control method, wherein a wireless parameter set corresponding to communication quality QoS is assigned for each packet to be transmitted different in a communication quality QoS request in mobile packet communication.

2. The adaptive wireless parameter control method according to claim 1, wherein the wireless parameter set includes at least any one of a retransmission parameter, a forward error correction scheme and a modulation scheme.

3. The adaptive wireless parameter control method according to claim 2, wherein the retransmission parameter is adjustably assigned in accordance with the communication quality QoS.

4. The adaptive wireless parameter control method according to claim 3, wherein the retransmission parameter includes at least any one of a retransmission algorithm and a maximum retransmission number of times.

5. The adaptive wireless parameter control method according to claim 4, wherein the maximum retransmission number of times is adjustably assigned based on whether the packet to be transmitted is a delayable packet.

6. The adaptive wireless parameter control method according to claim 2, wherein the forward error correction scheme is adjustably assigned in accordance with the communication quality QoS.

7. The adaptive wireless parameter control method according to claim 6, wherein the forward error correction scheme includes at least any one of an encoding method and an encoding factor.

8. The adaptive wireless parameter control method according to claim 2, wherein the modulation scheme is adjustably assigned in accordance with the communication quality QoS.

9. The adaptive wireless parameter control method according to claim 1, wherein the communication quality QoS includes communication quality QoS requested for the packet to be transmitted and communication quality QoS observed in an actual transmission.

10. The adaptive wireless parameter control method according to claim 9, wherein information concerning the communication quality QoS requested for the packet to be transmitted is superimposed within the packet.

11. The adaptive wireless parameter control method according to claim 9, wherein, in the case that the communication quality QoS requested for the packet to be transmitted is common to a plurality of packets, the information concerning the communication quality QoS is added to the plurality of packets.

12. The adaptive wireless parameter control method according to claim 1, wherein the wireless parameter set is assigned in accordance with the communication quality QoS and transmission path information.

13. A QoS control device comprising:

an adaptive wireless parameter controller for assigning a wireless parameter set corresponding to communication quality QoS for each packet to be transmitted different in the communication quality QoS in mobile packet communication.

14. The QoS control device according to claim 13, wherein the adaptive wireless parameter controller has a retransmission parameter controller which adjustably assigns a retransmission parameter as one of the wireless parameter set in accordance with the communication quality QoS.

15. The QoS control device according to claim 13, wherein the adaptive wireless parameter controller has an encoding scheme controller which adjustably assigns a forward error correction scheme as one of the wireless parameter set in accordance with the communication quality QoS.

16. The QoS control device according to claim 13, wherein the adaptive wireless parameter controller has a modulation scheme controller which adjustably assigns a modulation scheme as one of the wireless parameter set in accordance with the communication quality QoS.

17. The QoS control device according to claim 14, further comprising a transmission sequencing controller for inputting the retransmission parameter assigned by the retransmission parameter controller, and for performing retransmission control with respect to the packet to be transmitted based upon the retransmission parameter.

18. The QoS control device according to claim 15, further comprising an encoder for inputting the forward error correction scheme assigned by the encoding scheme controller, and for performing encoding with respect to the packet to be transmitted based upon the forward error correction scheme.

19. The QoS control device according to claim 16, further comprising a modulator for inputting the modulation scheme assigned by the modulation scheme controller, and for performing modulation processing with respect to the packet to be transmitted based upon the modulation scheme.

20. The QoS control device according to claim 13, further comprising a QoS information identification unit for inputting the packet to be transmitted, for identifying the communication quality QoS requested for the packet, and for supplying the identified communication quality QoS to the adaptive wireless parameter controller.

21. A wireless communication system comprising:

a base station; and

a mobile terminal for performing wireless communication with the base station,

wherein the base station includes an adaptive wireless parameter controller for assigning a wireless parameter set corresponding to communication quality QoS for each packet to be transmitted different in the communication quality QoS, when packet communication is performed with the mobile terminal.

22. The wireless communication system according to claim 21, wherein the base station regularly receives from the mobile terminal, the communication quality QoS observed in the actual transmission with the mobile terminal.

23. The wireless communication system according to claim 21, wherein the base station receives from the mobile terminal, the communication quality QoS observed in the actual transmission with the mobile terminal, by requesting to the mobile terminal.