Communication system

• US 10,674,514 B2
• Filed: 10/26/2015
• Issued: 06/02/2020
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Nakazawa, Masayuki, Suzuki, Kuniyuki, Mochizuki, Mitsuru, Ono, Koji, Nonami, Takayuki, Tomoe, Naohito, Hasegawa, Fumiki
• Primary Examiner(s): Zhao, Wei
• Application Number:
  US15/518,536
• Publication Number:
  US 20170238301A1
• Time in Patent Office: 1,681 Days
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0069 Allocation based on distance or geographical location allocation based on terminal or device properties in general, H04W72/51
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device'"'"'s location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Claims

1. A communication system comprising:

a plurality of communication terminal devices; and

a base station device configuring a cell in which said base station device is configured to perform radio communication with said communication terminal devices,

wherein said base station device is configured to set, for each communication terminal device of said communication terminal devices, a radio format and a subcarrier interval, for signals transmitted to and received from each of said communication terminal devices, the subcarrier interval being set according to a moving speed of each communication terminal device.

2. The communication system according to claim 1, wherein a different radio format is set for each of said communication terminal devices on the basis of a type of use of each of said communication terminal devices.

3. The communication system according to claim 1, wherein said base station device is configured to change a different radio format for said communication terminal device in accordance with information including a first change information in an environment of a radio communication between each of said communication terminal devices and said base station device and a second change information in a location of each of said communication terminal devices.

4. The communication system according to claim 1, wherein

said base station device and each of said communication terminal devices perform said radio communication by an orthogonal frequency division multiplexing scheme, and

the signals transmitted and received between said base station device and each of said communication terminal devices include a plurality of said radio formats in which at least one of a length of a symbol of each of said signals and a length of a cyclic prefix in said orthogonal frequency division multiplexing scheme differs.

5. The communication system according to claim 2, wherein

said base station device and each of said communication terminal devices perform said radio communication by an orthogonal frequency division multiplexing scheme, and

the signals transmitted and received between said base station device and each of said communication terminal devices include a plurality of said radio formats in which at least one of a length of a symbol of each of said signals and a length of a cyclic prefix in said orthogonal frequency division multiplexing scheme differs.

6. The communication system according to claim 3, wherein

said base station device and each of said communication terminal devices perform said radio communication by an orthogonal frequency division multiplexing scheme, and

the signals transmitted and received between said base station device and each of said communication terminal devices include a plurality of said radio formats in which at least one of a length of a symbol of each of said signals and a length of a cyclic prefix in said orthogonal frequency division multiplexing scheme differs.