Communication system, communication apparatus and communication method

• US 20180183495A1
• Filed: 02/16/2018
• Published: 06/28/2018
• Est. Priority Date: 12/17/2002
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Fujii, Kunihide, Morita, Tadashi, Arisawa, Shigeru, Takayama, Yoshihisa
• Granted Patent: US 10,355,750 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/77 for interrogation
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for a communication device includes determining whether a first radio frequency (RF) signal at a level of at least a first predetermined field threshold is detected. The method also includes generating a second RF signal at a level of at least a second predetermined field threshold greater than the first predetermined field threshold, when the communication device receives an instruction to generate the second RF signal and the determining determines that the first RF signal at the level of at least the first predetermined field threshold is not detected. The method further includes receiving a load modulated RF signal in response to the second RF signal.

Claims

1. An electronic device comprising:

circuitry configured to

receive a request command including a number of a time slots;

generate a random number in response to the request command;

determine if a time slot matches the random number; and

control sending a response to the request command when the time slot matches the random number.