Mobile wireless communication system

• US 9,955,329 B2
• Filed: 07/22/2015
• Issued: 04/24/2018
• Est. Priority Date: 07/28/2014
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Oga, Toshiyuki
• Primary Examiner(s): NGUYEN, KHAI MINH
• Application Number:
  US15/329,643
• Publication Number:
  US 20170215057A1
• Time in Patent Office: 1,007 Days
• Field of Search: 4554041, 4554042, 455405, 455450
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: H04W 80/10 adapted for application session management, e.g. SIP [Session Initiation Protocol] connection management H04W76/00; arrangements for session management H04L67/14
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Provided is a mobile wireless communication system that improves response immediacy in a wireless communication system using an SCPC communication system. For this purpose, a base station and/or a plurality of mobile stations is provided with a number-of-channels switching means that monitors the communication state to create determination information for determining the necessity of switching the number of channels, and that switches the ratio of the number of channels for downlink communications and that for uplink communications, in a case where a change in the number of channels is necessary on the basis of the determination information.

Claims

1. A mobile communication system comprising a base station and a plurality of mobile stations that communicate with the base station, wherein

at least one of the base station or the plurality of mobile stations includes a number-of-channels switching unit that monitors a communication state and creates determination information for determining a necessity of switching a number of channels, and that switches, when it is necessary to change the number of channels on the basis of the determination information, a ratio of numbers of channels for downlink communication and uplink communication, by dividing a bandwidth of a channel.

2. The mobile communication system according to claim 1, wherein

the number-of-channels switching unit switches the ratio of numbers of channels to a state of 1:

1 and a state of 1;

N (where N is a positive integer equal to or larger than

     2).

3. The mobile communication system according to claim 1, wherein

the base station transmits a control signal for making an instruction for setting the ratio of numbers of channels for downlink communication and uplink communication to a specific mobile station of the plurality of mobile stations.

4. The mobile communication system according to claim 3, wherein

the specific mobile station sets a transmission narrowband frequency channel for transmission for a transmitter on the basis of the control signal.

5. The mobile communication system according to claim 3, wherein

the base station sets a reception narrowband frequency channel for reception for a receiver on the basis of the control signal.

6. The mobile communication system according to claim 4, wherein

the transmission narrowband frequency channel is subjected to ASK modulation.

7. The mobile communication system according to claim 3, wherein

the determination information is generated by an instruction terminal device.

8. The mobile communication system according to claim 5, wherein

the transmission narrowband frequency channel is subjected to ASK modulation.