WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD

• US 20180035467A1
• Filed: 02/23/2016
• Published: 02/01/2018
• Est. Priority Date: 02/24/2015
• Status: Active Grant

• Current Assignee: Nippon Telegraph and Telephone Corporation
• Original Assignee: Nippon Telegraph and Telephone Corporation
• Inventors: KUDO, Riichi, ABEYSEKERA, Hirantha Sithira, TAKATORI, Yasushi, ICHIKAWA, Takeo, MIZOGUCHI, Masato, MORIOKA, Yasufumi, YASUDA, Hiroto, YAMADA, Akira, MORIHIRO, Yoshifumi, OKUMURA, Yukihiko
• Granted Patent: US 11,044,754 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/085 Access point devices with remote components
• CPC Class Codes: H04W 92/20 between access points

Abstract

A wireless user equipment performing wireless communication in a primary and a secondary frequency bands, a first wireless access point AP performing the wireless communication in the primary frequency band, and a second wireless base transceiver station BTS performing the wireless communication in the secondary frequency band are included. The AP and the BTS are connected to each other through a network. A UD report transfer unit transfers a UD report including information relating to transmission-waiting user data destined for a receiving node. The receiving node includes a transmission opportunity control unit which sets a fixed transmission prohibition time in a channel in the primary frequency band for a wireless communication device in a vicinity, obtains a transmission opportunity, grants the transmission opportunity to the transmitting node, and causes the user data to be transmitted from the transmitting node according to the transferred UD report.

Claims

1. A wireless communication system which includes:

one or more wireless stations having a function of performing wireless communication based on a random access scheme in a primary frequency band and a function of performing the wireless communication in a secondary frequency band which is different from the primary frequency band;

a first wireless access point performing the wireless communication with the wireless stations based on the random access scheme in the primary frequency band; and

a second wireless access point performing the wireless communication with the wireless stations in the secondary frequency band, in which

the first wireless access point and the second wireless access point are connected to each other through a network, the system comprising

when a node transmitting user data is defined as a transmitting node and a node receiving the user data is defined as a receiving node for the first wireless access point and the wireless stations, a UD report transfer unit transferring a UD report to the receiving node through the second wireless access point, the UD report includes information relating to transmission-waiting user data destined for the receiving node from the transmitting node, wherein

according to the UD report being transferred, the receiving node includes a transmission opportunity control unit which sets a fixed transmission prohibition time in a channel in the primary frequency band for a wireless communication device in a vicinity, obtains a transmission opportunity, grants the transmission opportunity to the transmitting node, and causes the user data to be transmitted from the transmitting node.

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

when the first wireless access point is the transmitting node and the wireless stations are the receiving node, the UD report transfer unit is configured to transfer the UD report generated in any one of the first wireless access point, the second wireless access point, and the network to the wireless stations through the second wireless access point.

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

when the wireless stations are the transmitting node and the first wireless access point is the receiving node, the UD report transfer unit is configured to transfer the UD report generated in the wireless stations to the first wireless access point through the second wireless access point,.

4. The wireless communication system according to claim 1, wherein:

the first wireless access point and a plurality of the wireless stations are configured to be capable of performing multi-user simultaneous communication;

the UD report transfer unit is configured to transfer the UD report through the second wireless access point between the first wireless access point and the plurality of wireless stations performing the multi-user simultaneous communication; and

after the transmission opportunity control unit of the receiving node obtains and grants the transmission opportunity based on the UD report, the first wireless access point is configured to determine whether or not to perform the multi-user simultaneous communication and then to perform the multi-user simultaneous communication.

5. The wireless communication system according to claim 1, wherein:

the UD report transfer unit is configured to add to the user data which is transmitted from the transmitting node to the receiving node the UD report and to transfer the user data, the UD report includes one of a communication condition, starting and continuation conditions, and a termination command for communication based on the obtaining and the granting of the transmission opportunity in the receiving node; and

the transmission opportunity control unit of the receiving node is configured to perform one of update and termination of the condition for the communication based on the obtaining and the granting of the transmission opportunity in the receiving node based on the UD report being added to the user data.

6. The wireless communication system according to claim 1, wherein

the UD report transfer unit is configured to determine whether transmission opportunity communication for performing communication based on the obtaining and the granting of the transmission opportunity in the receiving node is possible or not from at least one of wireless environment information measured in the first wireless access point, wireless environment information measured in the wireless stations, traffic information of the second wireless access point, a configuration of a network between the first wireless access point and the second wireless access point, and a type of user grade, and to generate the UD report when the communication based on the obtaining and the granting of the transmission opportunity in the receiving node is determined to be enabled.

7. The wireless communication system according to claim 6, wherein

when channel utilization measured at the transmitting node is lower than a predetermined value, the UD report transfer unit is configured to generate the UD report for causing the receiving node to obtain the transmission opportunity.

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

the UD report includes an access category of the transmission-waiting user data.

9. The wireless communication system according to claim 1, wherein

the UD report includes information designating one of a length of the transmission prohibition time and a change in the length of the transmission prohibition time, the transmission prohibition time being set when the receiving node obtains the transmission opportunity.

10. The wireless communication system according to claim 1, wherein

the UD report includes, as information relating to the transmission-waiting user data, at least one of requested throughput of an uplink or a downlink operating in a channel in a first frequency, requested throughput for communication based on the obtaining and the granting of the transmission opportunity in the receiving node in the uplink or the downlink operated in the channel in the first frequency, a presence of the transmission-waiting user data in the transmitting node, a total amount of the transmission-waiting user data in the transmitting node, a number of times that the communication based on the obtaining and the granting of the transmission opportunity in the receiving node is performed, a frequency with which the communication based on the obtaining and the granting of the transmission opportunity in the receiving node is performed, a starting time at which the communication based on the obtaining and the granting of the transmission opportunity in the receiving node is performed, and an instruction to perform one communication based on the obtaining and the granting of the transmission opportunity in the receiving node.

11. A wireless communication method of a wireless communication system which includes:

one or more wireless stations having a function of performing wireless communication based on a random access scheme in a primary frequency band and a function of performing the wireless communication in a secondary frequency band which is different from the primary frequency band;

a first wireless access point performing the wireless communication with the wireless stations in the primary frequency band; and

a second wireless access point performing the wireless communication with the wireless stations in the secondary frequency band, in which

the first wireless access point and the second wireless access point are connected to each other through a network, the method comprising;

a first step in which any one of the first wireless access point, the second wireless access point, and the network generates information relating to transmission-waiting user data destined for the wireless stations from the first wireless access point as a UD report and aggregates in the second wireless access point;

a second step in which the second wireless access point transfers the UD report aggregated in the first step to the wireless stations; and

a third step in which, according to the UD report transferred in the second step, the wireless stations sets a fixed transmission prohibition time in a channel in the primary frequency band for a wireless communication device in a vicinity, obtains a transmission opportunity, grants the transmission opportunity to the first wireless access point, and causes the user data to be transmitted from the first wireless access point.

12. A wireless communication method of a wireless communication system which includes:

one or more wireless stations having a function of performing wireless communication based on a random access scheme in a primary frequency band and a function of performing the wireless communication in a secondary frequency band which is different from the primary frequency band;

a first wireless access point performing the wireless communication with the wireless stations in the primary frequency band; and

a second wireless access point performing the wireless communication with the wireless stations in the secondary frequency band, in which

the first wireless access point and the second wireless access point are connected to each other through a network, the method comprising;

a first step in which the wireless stations generate information relating to transmission-waiting user data destined for the first wireless access point from the wireless stations as a UD report and notify to the second wireless access point;

a second step in which the second wireless access point transfers the UD report notified in the first step to the first wireless access point; and

a third step in which, according to the UD report transferred in the second step, the first wireless access point sets a fixed transmission prohibition time in a channel in the primary frequency band for a wireless communication device in a vicinity, obtains a transmission opportunity, grants the transmission opportunity to the wireless stations, and causes the user data to be transmitted from the wireless stations.