Wireless transfer device and method for control of wireless transfer band

• US 9,571,237 B2
• Filed: 07/04/2013
• Issued: 02/14/2017
• Est. Priority Date: 07/12/2012
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Saito, Kaichiro
• Primary Examiner(s): EBRAHIM, ANEZ C
• Application Number:
  US14/413,914
• Publication Number:
  US 20150172008A1
• Time in Patent Office: 1,321 Days
• US Class Current: 1/1
• 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 1/206 for modulated signals
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay

Abstract

A wireless transfer device (100) is provided with: a transfer band control unit (13) for deciding upon a transfer band, on the basis of the result of a comparison of communication quality information pertaining to wireless communication, and a predetermined band control threshold value; a modulation scheme control unit (14) for deciding on a modulation scheme, on the basis of the result of a comparison of communication quality information and a predetermined modulation control threshold value; a transmission process unit (11) for controlling the transfer band for packet signals on the basis of the transfer band decided upon by the transfer band control unit (13), and outputting packet signals; and a wireless transceiver unit (12), for performing a modulation process on the packet signals output by the transmission process unit (11), doing so on the basis of the modulation scheme decided upon by the modulation scheme control unit (14). The band control threshold value and the modulation control threshold value are different values. In so doing, loss of high-priority packet signals, as well as transient fluctuations of transfer delay time, are avoided.

Claims

1. A wireless transfer device, comprising:

a memory storing instructions;

one or more processors configured to execute the instructions to;

determine a transfer band for a packet signal transmitted to a wireless transfer path, on the basis of a result of a comparison of communication quality information pertaining to wireless communication, and a predetermined band control threshold value which is a standard for changing the transfer band;

determine a modulation scheme to be applied to the wireless transfer path, on the basis of a result of a comparison of the communication quality information and a predetermined modulation control threshold value which is a standard for changing the modulation scheme;

secure the determined transfer band in the wireless transfer path, and output the packet signal; and

perform a modulation process on the packet signal, on the basis of the determined modulation scheme,

wherein the band control threshold value and the modulation control threshold value are set to be different values, to create a time lag between an operation for changing the transfer band and an operation for changing wireless transfer capacity of the wireless transfer path, the wireless transfer capacity being changed in conjunction with the changing of the modulation scheme.

2. The wireless transfer device of claim 1, wherein the band control threshold value is set to be larger than the modulation control threshold value so that:

the operation for changing the transfer band is carried out prior to the operation for changing the modulation scheme when communication quality of the wireless transfer path is deteriorated, and the operation for changing the modulation scheme is carried out prior to the operation for changing the transfer band when the communication quality of the wireless transfer path is improved.

3. The wireless transfer device of claim 1, wherein the communication quality information on the wireless communication includes at least one of an electric field level of the wireless communication, a bit error rate of a wireless line, or an SN ratio (signal noise ratio).

4. A method for controlling a transfer band for a packet signal transmitted to a wireless transfer path and a modulation scheme to be applied to the wireless transfer path, the method comprising:

determining the transfer band, on the basis of a result of a comparison of communication quality information pertaining to wireless communication, and a predetermined band control threshold value which is a standard for changing the transfer band;

determining the modulation scheme, on the basis of a result of a comparison of the communication quality information and a predetermined modulation control threshold value which is a standard for changing the modulation scheme;

securing the determined transfer band in the wireless transfer path, and outputting the packet signal; and

performing a modulation process on the packet signal, on the basis of the determined modulation scheme,

wherein the band control threshold value and the modulation control threshold value are set to be different values, to create a time lag between an operation for changing the transfer band and an operation for changing wireless transfer capacity of the wireless transfer path, the wireless transfer capacity being changed in conjunction with the changing of the modulation scheme.

5. The method of claim 4, wherein the band control threshold value is set to be larger than the modulation control threshold value so that:

the operation for changing the transfer band is carried out prior to the operation for changing the modulation scheme when communication quality of the wireless transfer path is deteriorated, and the operation for changing the modulation scheme is carried out prior to the operation for changing the transfer band when the communication quality of the wireless transfer path is improved.

6. The method of claim 4, wherein the communication quality information on the wireless communication includes at least one of an electric field level of the wireless communication, a bit error rate of a wireless line, or an SN ratio (signal noise ratio).