Communication delay time derivation method, communication terminal and communication delay time derivation program

• US 9,210,721 B2
• Filed: 03/14/2012
• Issued: 12/08/2015
• Est. Priority Date: 03/22/2011
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ueda, Hirofumi, Fujita, Norihito
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): Chowdhury, Fahmida
• Application Number:
  US13/976,316
• Publication Number:
  US 20130272205A1
• Time in Patent Office: 1,364 Days
• Field of Search: 370/328
• US Class Current: 1/1
• CPC Class Codes: H04W 40/12 based on transmission quality or channel quality
• CPC Class Codes: H04W 40/16 based on interference
• CPC Class Codes: H04W 56/0055 determining timing error of reception due to propagation delay
• CPC Class Codes: H04W 56/0085 detecting a given structure in the signal
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

There is provided a communication delay time derivation method for calculating a communication delay time depending on a combination of channels set between communication terminals on a communication path in the MCH/IF environment. When selecting a channel to be used for communication in each section on the communication path per section between communication terminals on the communication path, a calculation target section specification means 82 detects an inter-terminal selected channel repetitive pattern as a pattern of the selected channels cyclically appearing on the communication path, and defines a section corresponding to the inter-terminal selected channel repetitive pattern as a communication delay time calculation target section. A communication delay time derivation means 83 derives a communication delay time in the calculation target section based on the inter-terminal selected channel repetitive pattern.

Claims

1. A communication delay time derivation method executed by a communication terminal comprising at least one wireless interface assigned with a communication channel, the communication delay time derivation method comprising:

detecting an inter-terminal selected channel repetitive pattern as a pattern of selected channels cyclically appearing on a communication path, when selecting a channel to be used for communication in each section on the communication path per section between communication terminals on the communication path;

defining a section corresponding to the inter-terminal selected channel repetitive pattern as a communication delay time calculation target section; and

deriving a communication delay time in the calculation target section based on the inter-terminal selected channel repetitive pattern.

2. The communication delay time derivation method according to claim 1, wherein the communication terminal detects the inter-terminal selected channel repetitive pattern by inquiring a channel to be selected to another communication terminal.

3. The communication delay time derivation method according to claim 1, wherein after selecting a channel in a section from the communication terminal to another communication terminal, the communication terminal repeatedly estimates a channel to be selected when the communication terminal is assumed to be in the same channel use situation as the other communication terminal as a channel in a section from the other communication terminal to a next communication terminal, thereby detecting the inter-terminal selected channel repetitive pattern.

4. The communication delay time derivation method according to claim 1, wherein the communication terminal makes communication in the calculation target section according to the inter-terminal selected channel repetitive pattern, and measures the communication delay time in the calculation target section.

5. The communication delay time derivation method according to claim 1, wherein the communication terminal calculates the communication delay time in the calculation target section based on capacities of individual channels contained in the inter-terminal selected channel repetitive pattern, and a size of data to be transmitted.

6. The communication delay time derivation method according to claim 1, wherein the communication terminal calculates the communication delay time per unit distance based on the communication delay time in the calculation target section and a distance of the calculation target section.

7. A communication terminal comprising:

at least one wireless interface assigned with a communication channel;

a calculation target section specification unit for, when selecting a channel to be used for communication in each section on a communication path per section between communication terminals on the communication path, detecting an inter-terminal selected channel repetitive pattern as a pattern of the selected channels cyclically appearing on the communication path, and defining a section corresponding to the inter-terminal selected channel repetitive pattern as a communication delay time calculation target section; and

a communication delay time derivation unit for deriving a communication delay time in the calculation target section based on the inter-terminal selected channel repetitive pattern.

8. The communication terminal according to claim 7, wherein the calculation target section specification unit detects the inter-terminal selected channel repetitive pattern by inquiring a channel to be selected to another communication terminal.

9. The communication terminal according to claim 7, wherein after selecting a channel in a section from the communication terminal to another communication terminal, the calculation target section specification unit repeatedly estimates a channel to be selected when the communication terminal is assumed to be in the same channel use situation as the other communication terminal as a channel in a section from the other communication terminal to a next communication terminal, thereby detecting the inter-terminal selected channel repetitive pattern.

10. A non-transitory computer-readable recording medium in which a communication delay time derivation program is recorded, the communication delay time derivation program causing a computer comprising at least one wireless interface assigned with a communication channel to perform:

a calculation target section specification processing of, when selecting a channel to be used for communication in each section on a communication path per section between communication terminals on the communication path, detecting an inter-terminal selected channel repetitive pattern as a pattern of the selected channels cyclically appearing on the communication path, and defining a section corresponding to the inter-terminal selected channel repetitive pattern as a communication delay time calculation target section; and

a communication delay time derivation processing of deriving a communication delay time in the calculation target section based on the inter-terminal selected channel repetitive pattern.