Mobile wireless communication system

• US 10,285,037 B2
• Filed: 03/12/2018
• Issued: 05/07/2019
• 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 M
• Application Number:
  US15/918,001
• Publication Number:
  US 20180206101A1
• Time in Patent Office: 421 Days
• 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 and the plurality of mobile stations includes a number-of-channels switching unit that switches, on the basis of a communication state, 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 5, wherein

the reception narrowband frequency channel is subjected to ASK modulation.

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

the number-of-channels switching unit monitors the communication state and, with reference to the communication state, sets at least one of a frequency channel, a bandwidth, a modulation processing, a demodulation processing, an encoding processing, a decoding processing, and a transmission power.

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

the base station includes a number-of-channels switching unit that switches, on the basis of a communication state, a ratio of numbers of channels for downlink communication and uplink communication, by dividing a bandwidth of a channel.

10. The base station according to claim 9, 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).

11. The base station according to claim 9, 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.

12. The base station according to claim 11, wherein

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

13. The base station according to claim 12, wherein

the reception narrowband frequency channel is subjected to ASK modulation.

14. The base station according to claim 9, wherein

the number-of-channels switching unit monitors the communication state and, with reference to the communication state, sets at least one of a frequency channel, a bandwidth, a modulation processing, a demodulation processing, an encoding processing, a decoding processing, and a transmission power.

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

the mobile station includes a number-of-channels switching unit that switches, on the basis of a communication state, a ratio of numbers of channels for downlink communication and uplink communication, by dividing a bandwidth of a channel.

16. The mobile station according to claim 15, 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).

17. The mobile station according to claim 15, 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 the mobile station.

18. The mobile station according to claim 17, wherein

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

19. The mobile station according to claim 18, wherein

the transmission narrowband frequency channel is subjected to ASK modulation.

20. The mobile station according to claim 15, wherein

the number-of-channels switching unit monitors the communication state and, with reference to the communication state, sets at least one of a frequency channel, a bandwidth, a modulation processing, a demodulation processing, an encoding processing, a decoding processing, and a transmission power.