Multi-hop communication terminal, multi-hop communication system, and multi-hop communication method

• US 9,144,006 B2
• Filed: 09/04/2013
• Issued: 09/22/2015
• Est. Priority Date: 11/16/2012
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Fujita, Hiroshi, Ozaki, Kazuyuki, Wen, Yun
• Primary Examiner(s): Shah, Chirag
• Assistant Examiner(s): PERSAUD, AMARNAUTH G
• Application Number:
  US14/017,843
• Publication Number:
  US 20140140229A1
• Time in Patent Office: 748 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 40/08 based on transmission power
• CPC Class Codes: H04W 40/22 using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a gateway (GW), when interference is detected by an interference detection unit, a frame generation unit sends an interference broadcast signal. A terminal receives the interference broadcast signal sent at a maximum transmission power from the GW to which the terminal belongs. The interference broadcast signal includes information on a planned transmission power value that is a transmission power value of a data signal in the GW and is smaller than the maximum transmission power value. The interference broadcast signal is sent at the maximum transmission power value.

Claims

1. A multi-hop communication terminal that communicates with a gateway to which the multi-hop communication terminal belongs via a communication route that is an indirect route including at least one other terminal or a direct route, the multi-hop communication terminal comprising:

a receiving unit that receives;

a first broadcast signal that is sent at a first transmission power value from the gateway to which the multi-hop communication terminal belongs and that includes information on a first planned transmission power value of a data signal in the gateway to which the multi-hop communication terminal belongs, the first planned transmission power value being smaller than the first transmission power value; and

a hello signal that includes type information and identification information of a node other than the terminal, and information on a second planned transmission power value of a data signal in the other node;

a routing control unit that determines the communication route based on the received first broadcast signal and the received hello signal;

a power control unit that determines a second transmission power value of a data signal in the terminal based on the received first broadcast signal, the received hello signal, and the determined communication route; and

a calculation unit that calculates a path loss value between the terminal and a transmission source node of the received first broadcast signal or the received hello signal based on the received first broadcast signal or the received hello signal, and calculates a required transmission power value based on the calculated path loss value and a required receiving power value;

wherein

when a second broadcast signal is not received from a gateway other than the gateway to which the multi-hop communication terminal belongs, and when the first planned transmission power value is larger than the required transmission power value between the terminal and the gateway to which the multi-hop communication terminal belongs that has been calculated by the calculation unit, the power control unit determines the first planned transmission power value as the second transmission power value.

2. A multi-hop communication terminal that communicates with a gateway to which the multi-hop communication terminal belongs via a communication route that is an indirect route including at least one other terminal or a direct route, the multi-hop communication terminal comprising:

a receiving unit that receives;

a first broadcast signal that is sent at a first transmission power value from the gateway to which the multi-hop communication terminal belongs and that includes information on a first planned transmission power value of a data signal in the gateway to which the multi-hop communication terminal belongs, the first planned transmission power value being smaller than the first transmission power value; and

a hello signal that includes type information and identification information of a node other than the terminal, and information on a second planned transmission power value of a data signal in the other node;

a routing control unit that determines the communication route based on the received first broadcast signal and the received hello signal;

a power control unit that determines a second transmission power value of a data signal in the terminal based on the received first broadcast signal, the received hello signal, and the determined communication route; and

a calculation unit that calculates a path loss value between the terminal and a transmission source node of the received first broadcast signal or the received hello signal based on the received first broadcast signal or the received hello signal, and calculates a required transmission power value based on the calculated path loss value and a required receiving power value;

wherein

when a second broadcast signal is not received from a gateway other than the gateway to which the multi-hop communication terminal belongs, and when the first planned transmission power value is smaller than the required transmission power value between the terminal and the gateway to which the multi-hop communication terminal belongs that has been calculated by the calculation unit, the routing control unit identifies a plurality of route alternatives each including, as an adjacent terminal, each of a plurality of terminals of which the required transmission power value calculated by the calculation unit is smaller than the first planned transmission power value, and sets, as the communication route, the route alternative having smallest route cost among the identified route alternatives; and

the power control unit determines the first planned transmission power value as the second transmission power value.

3. A multi-hop communication terminal that communicates with a gateway to which the multi-hop communication terminal belongs via a communication route that is an indirect route including at least one other terminal or a direct route, the multi-hop communication terminal comprising:

a receiving unit that receives;

a first broadcast signal that is sent at a first transmission power value from the gateway to which the multi-hop communication terminal belongs and that includes information on a first planned transmission power value of a data signal in the gateway to which the multi-hop communication terminal belongs, the first planned transmission power value being smaller than the first transmission power value; and

a hello signal that includes type information and identification information of a node other than the terminal, and information on a second planned transmission power value of a data signal in the other node;

a routing control unit that determines the communication route based on the received first broadcast signal and the received hello signal; and

a power control unit that determines a second transmission power value of a data signal in the terminal based on the received first broadcast signal, the received hello signal, and the determined communication route,

wherein

the receiving unit receives a second broadcast signal from a gateway other than the gateway to which the multi-hop communication terminal belongs;

the multi-hop communication terminal further comprises a calculation unit that calculates a path loss value between the terminal and a transmission source node of the received first broadcast signal, the received second broadcast signal, or the received hello signal based on the received first broadcast signal, the received second broadcast signal, or the received hello signal, and calculates a required transmission power value based on the calculated path loss value and a required receiving power value; and

the power control unit determines the second transmission power value to be a value smaller than the required transmission power value between the other gateway and the terminal that has been calculated by the calculation unit.

4. A multi-hop communication terminal that communicates with a gateway to which the multi-hop communication terminal belongs via a communication route that is an indirect route including at least one other terminal or a direct route, the multi-hop communication terminal comprising:

a receiving unit that receives;

a first broadcast signal that is sent at a first transmission power value from the gateway to which the multi-hop communication terminal belongs and that includes information on a first planned transmission power value of a data signal in the gateway to which the multi-hop communication terminal belongs, the first planned transmission power value being smaller than the first transmission power value; and

a hello signal that includes type information and identification information of a node other than the terminal, and information on a second planned transmission power value of a data signal in the other node;

a routing control unit that determines the communication route based on the received first broadcast signal and the received hello signal; and

a power control unit that determines a second transmission power value of a data signal in the terminal based on the received first broadcast signal, the received hello signal, and the determined communication route; and

a calculation unit that calculates a path loss value between the terminal and a transmission source node of the received hello signal based on the received hello signal, and calculates a required transmission power value based on the calculated path loss value and a required receiving power value;

wherein

when neither the first broadcast signal from the gateway to which the multi-hop communication terminal belongs nor a second broadcast signal from a gateway other than the gateway to which the multi-hop communication terminal belongs is received, the routing control unit identifies a plurality of route alternatives each including, as an adjacent terminal, each of a plurality of terminals of which the required transmission power value calculated by the calculation unit is smaller than the second planned transmission power included in the hello signal sent from the adjacent terminal on the currently set communication route, and sets, as the communication route, the route alternative having smallest route cost among the identified route alternatives.