Radio communication system, base station and radio communication method

Patent metadata

Field	Value
Publication number	US-10939439-B2
Application number	US-201916553686-A
Country	US
Kind code	B2
Filing date	Aug 28, 2019
Priority date	Aug 30, 2018
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

A base station holds information on uplink radio resources which has been allocated to at least one already connected communication terminal for performing radio communication using a high frequency with the base station, receives a notification of participation in a radio communication system from a new communication terminal, and allocates unallocated uplink radio resources using high frequencies to the new communication terminal based on the information on the uplink radio resources when received the notification of participation. The new communication terminal transmits data to the base station by using the allocated uplink radio resources.

First claim

What is claimed is:

1. A radio communication system configured to support a grant free access (GFA) by a communication terminal to transmit data to a base station, the radio communication system comprising:
a base station; and
at least one already connected communication terminal that is configured to perform a radio communication using a high frequency with the base station,
wherein,
the base station holds information on uplink radio resources allocated to the at least one already connected communication terminal,
the base station receives a notification of participation in the radio communication system from a new communication terminal, and allocates unallocated uplink radio resources using the high frequency to the new communication terminal based on the information on the uplink radio resources allocated to the at least one already connected communication terminal so as to satisfy: i) at least one terminal is accommodated per approximately one square meters (m 2 ) of a cell coverage area of the base station, and ii) a shorter transmission time period and a shorter reception time period are allocated to the new communication terminal than those time periods used in LTE, and
the new communication terminal transmits data to the base station by using the allocated uplink radio resources.

2. The radio communication system according to claim 1 , wherein the base station updates the information on the uplink radio resources according to the allocation of the previously unallocated uplink radio resources to the new communication terminal.

3. The radio communication system according to claim 1 , wherein the base station allocates the unallocated uplink radio resources to the new communication terminal and instructs the new communication terminal to perform data transmission via an uplink dedicated channel, and
the new communication terminal performs the data transmission via the uplink dedicated channel.

4. The radio communication system according to claim 1 , wherein, after the uplink radio resources are allocated to the new communication terminal by the base station, the new communication terminal performs the data transmission to the base station by the GFA.

5. The radio communication system according to claim 1 , wherein the base station determines whether a data transmission frequency in a defined period from at least one communication terminal of the already connected communication terminal and the new communication terminal is less than a defined value, and
the base station releases the allocated uplink radio resources of the at least one communication terminal determined to use the data transmission frequency less than the defined value, and updates the information on the uplink radio resources.

6. The radio communication system according to claim 1 , wherein the base station determines whether there is no data transmission from at least one communication terminal of the already connected communication terminal and the communication terminal for a defined time or more, and
the base station releases the allocated uplink radio resources of the at least one communication terminal determined to have no data transmission for the defined time or more, and updates the information on the uplink radio resources.

7. The radio communication system according to claim 5 , wherein the base station determines whether the data transmission frequency in a second defined period from the at least one communication terminal of which the uplink radio resources are released is equal to or more than a second defined value, and
the base station allocates the unallocated uplink radio resources to the at least one communication terminal determined to use the data transmission frequency equal to or more than the second defined value, and updates the information on the uplink radio resources.

8. The radio communication system according to claim 6 , wherein the base station determines whether a data transmission frequency in a defined period from the at least one communication terminal of which the uplink radio resources are released is equal to or more than a second defined value, and
the base station allocates the unallocated uplink radio resources to the at least one communication terminal determined to use the data transmission frequency equal to or more than the second defined value, and updates the information on the uplink radio resources.

9. The radio communication system according to claim 1 , wherein the transmission time period and the reception time period allocated to the new communication terminal are ½ msec or ⅛ msec, which are shorter than 1-msec time periods used in LTE.

10. A base station included in a radio communication system configured to support a grant free access (GFA) by a communication terminal to transmit data to the base station, the base station comprising:
a memory that holds information on uplink radio resources which have been allocated to at least one already connected communication terminal for performing a radio communication using a high frequency with the base station;
a communication circuit that receives a notification of participation in the radio communication system from a new communication terminal; and
a radio resource management circuit that allocates unallocated uplink radio resources using the high frequency to the new communication terminal based on the information on the uplink radio resources allocated to the at least one already connected communication terminal so as to satisfy: i) at least one terminal is accommodated per approximately one square meters (m 2 ) of a cell coverage area of the base station, and ii) a shorter transmission time period and a shorter reception time period are allocated to the new communication terminal than those time periods used in LTE,
wherein the communication circuit transmits an instruction to the new communication terminal to perform data transmission using the allocated uplink radio resources.

11. The base station according to claim 10 , wherein the transmission time period and the reception time period allocated to the new communication terminal are ½ msec or ⅛ msec, which are shorter than 1-msec time periods used in LTE.

12. A radio communication method in a radio communication system including a base station and at least one already connected communication terminal that is configured to perform a radio communication using a high frequency with the base station, the radio communication system supportive of a grant free access (GFA) by a communication terminal to transmit data to the base station, the radio communication method comprising:
by the base station, holding information on uplink radio resources which have been allocated to the at least one already connected communication terminal;
by the base station, receiving a notification of participation in the radio communication system from a new communication terminal;
by the base station, allocating unallocated uplink radio resources using the high frequency to the new communication terminal based on the information on the uplink radio resources allocated to the at least one already connected communication terminal so as to satisfy: i) at least one terminal is accommodated per approximately one square meters (m 2 ) of a cell coverage area of the base station, and ii) a shorter transmission time period and a shorter reception time period are allocated to the new communication terminal than those time periods used in LTE; and
by the new communication terminal, transmitting data to the base station by using the allocated uplink radio resources.

13. The radio communication method according to claim 12 , wherein the transmission time

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kato Osamu
• Asano Hiroaki
• Kanemoto Hideki

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/53

  based on regulatory allocation policies · CPC title

• H04W72/0453 Primary

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W72/04 Primary

  Wireless resource allocation · CPC title

• H04W72/042

  Electricity · mapped topic