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

• US 7,616,658 B2
• Filed: 02/27/2003
• Issued: 11/10/2009
• Est. Priority Date: 02/28/2002
• Status: Expired due to Fees

• 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
• Primary Examiner(s): Sefcheck; Gregory B
• Application Number:
  US10/373,747
• Publication Number:
  US 20030161323A1
• Time in Patent Office: 2,448 Days
• Field of Search: None
• US Class Current: 370/465
• 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, for assigning a wireless parameter set including a maximum number of times for retransmission, a forward error correction scheme and a modulation scheme, for each packet to be transmitted including a different requested QoS information in accordance with the requested QoS information in mobile packet communication, comprising:

determining whether or not the packet to be transmitted is a delayable packet;

assigning, with a controller, a first maximum number of times for retransmission, a forward error correction scheme corresponding to the first maximum number of times for retransmission and a modulation scheme corresponding to the first maximum number of times for retransmission, for the packet to be transmitted, when the packet to be transmitted is determined to be a delayable packet; and

assigning, with the controller, a second maximum number of times for retransmission which is smaller than the first maximum number of times for retransmission, a forward error correction scheme determined based on the second maximum number of times for retransmission and an observed QoS in an actual transmission and a modulation scheme determined based on the second maximum number of times for retransmission and the observed QoS in the actual transmission, when the packet to be transmitted is determined not to be a delayable packet.

2. The method of claim 1, wherein the controller is an adaptive wireless parameter controller of a base station.

3. A QoS control device comprising:

an adaptive wireless parameter controller for assigning a wireless parameter set including a maximum number of times for retransmission, a forward error correction scheme and a modulation scheme, for each packet to be transmitted including a different requested QoS information in accordance with the requested QoS information in mobile packet communication;

a QoS information identification unit for determining whether or not the packet to be transmitted is a delayable packet,

wherein the adaptive wireless parameter controller has a retransmission parameter controller which adjustably assigns the maximum number of times for retransmission, an encoding scheme controller which adjustably assigns the forward error correction scheme, and a modulation scheme controller which adjustably assigns the modulation scheme, in accordance with the requested QoS information,

and wherein the retransmission parameter controller assigns a first maximum number of times for retransmission, the encoding scheme controller assigns a forward error correction scheme corresponding to the first maximum number of times for retransmission, the modulation scheme controller assigns the modulation scheme corresponding to the first maximum number of times for retransmission, for the packet to be transmitted, when the packet to be transmitted is determined to be a delayable packet,

and wherein the retransmission parameter controller assigns a second maximum number of times for retransmission which is smaller than the first maximum number of times for retransmission, the encoding scheme controller assigns a forward error correction scheme determined based on the second maximum number of times for retransmission and an observed QoS in an actual transmission, and the modulation scheme controller assigns a modulation scheme determined based on the second maximum number of times for retransmission and the observed QoS in an actual transmission, when the packet to be transmitted is determined not to be a delayable packet.

4. A base station, for performing wireless communication with a mobile terminal, comprising:

an adaptive wireless parameter controller for assigning a wireless parameter set including a maximum number of times for retransmission, a forward error correction scheme and a modulation scheme, for each packet to be transmitted including a different requested QoS information in accordance with the requested QoS information in mobile packet communication;

a QoS information identification unit for determining whether or not the packet to be transmitted is a delayable packet,

wherein the adaptive wireless parameter controller has a retransmission parameter controller which adjustably assigns the maximum number of times for retransmission, an encoding scheme controller which adjustably assigns the forward error correction scheme, and a modulation scheme controller which adjustably assigns the modulation scheme, in accordance with the requested QoS information,

and wherein the retransmission parameter controller assigns a first maximum number of times for retransmission, the encoding scheme controller assigns a forward error correction scheme corresponding to the first maximum number of times for retransmission, the modulation scheme controller assigns the modulation scheme corresponding to the first maximum number of times for retransmission, for the packet to be transmitted, when the packet to be transmitted is determined to be a delayable packet,

and wherein the retransmission parameter controller assigns a second maximum number of times for retransmission which is smaller than the first maximum number of times for retransmission, the encoding scheme controller assigns a forward error correction scheme determined based on the second maximum number of times for retransmission and an observed QoS in an actual transmission, and the modulation scheme controller assigns a modulation scheme determined based on the second maximum number of times for retransmission and the observed QoS in an actual transmission, when the packet to be transmitted is determined not to be a delayable packet.

5. 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 including a maximum number of times for retransmission, a forward error correction scheme and a modulation scheme, for each packet to be transmitted including a different requested QoS information in accordance with the requested QoS information when a packet communication is performed with the mobile terminal;

a QoS information identification unit for determining whether or not the packet to be transmitted is a delayable packet,

wherein the adaptive wireless parameter controller has a retransmission parameter controller which adjustably assigns the maximum number of times for retransmission, an encoding scheme controller which adjustably assigns the forward error correction scheme, and a modulation scheme controller which adjustably assigns the modulation scheme, in accordance with the requested QoS information,

and wherein the retransmission parameter controller assigns a first maximum number of times for retransmission, the encoding scheme controller assigns a forward error correction scheme corresponding to the first maximum number of times for retransmission, the modulation scheme controller assigns the modulation scheme corresponding to the first maximum number of times for retransmission, for the packet to be transmitted, when the packet to be transmitted is determined to be a delayable packet,

and wherein the retransmission parameter controller assigns a second maximum number of times for retransmission which is smaller than the first maximum number of times for retransmission, the encoding scheme controller assigns a forward error correction scheme determined based on the second maximum number of times for retransmission and an observed QoS in an actual transmission, and the modulation scheme controller assigns a modulation scheme determined based on the second maximum number of times for retransmission and the observed QoS in an actual transmission, when the packet to be transmitted is determined not to be a delayable packet.