User equipment and transmission control method

Patent metadata

Field	Value
Publication number	US-2016344534-A1
Application number	US-201515112722-A
Country	US
Kind code	A1
Filing date	Jan 15, 2015
Priority date	Jan 30, 2014
Publication date	Nov 24, 2016
Grant date	—

Abstract

User equipment for transmitting an uplink control channel in multiple cells simultaneously in a radio communication system where transmission of the uplink control channel in a secondary cell is supported is disclosed. One aspect of the present invention relates to the user equipment, comprising: a transmission and reception unit configured to transmit and receive a radio channel to/from a base station via multiple cells configured for carrier aggregation; a simultaneous transmission availability determination unit configured to determine, in response to occurrence of an event where an uplink control channel is to be transmitted in the multiple cells simultaneously, whether the uplink control channel can be transmitted in the multiple cells simultaneously; and a transmission control unit configured to instruct the transmission and reception unit to transmit the uplink control channel in the multiple cells simultaneously if the uplink control channel can be transmitted in the multiple cells simultaneously and control transmission of the uplink control channel in accordance with transmission priorities corresponding to cell types if the uplink control channel cannot be transmitted in the multiple cells simultaneously.

First claim

1 . User equipment, comprising:
a transmission and reception unit configured to transmit and receive a radio channel to/from a base station via multiple cells configured for carrier aggregation; a simultaneous transmission availability determination unit configured to determine, in response to occurrence of an event where an uplink control channel is to be transmitted in the multiple cells simultaneously, whether the uplink control channel can be transmitted in the multiple cells simultaneously; and a transmission control unit configured to instruct the transmission and reception unit to transmit the uplink control channel in the multiple cells simultaneously if the uplink control channel can be transmitted in the multiple cells simultaneously and control transmission of the uplink control channel in accordance with transmission priorities corresponding to cell types if the uplink control channel cannot be transmitted in the multiple cells simultaneously.

2 . The user equipment as claimed in claim 1 , wherein the transmission control unit has a cell type determination unit configured to determine which of a primary cell, a Special secondary cell or a secondary cell the cell type of the cell is, and the transmission control unit controls transmission of the uplink control channel in the determined cell corresponding to the determination in accordance with the transmission priorities of order of the primary cell, the Special secondary cell and the secondary cell.

3 . The user equipment as claimed in claim 2 , wherein the transmission control unit assigns a relatively large amount of transmit power to a cell having a higher transmission priority and assigns a relatively small amount of transmit power to a cell having a lower transmission priority or stops transmission of the uplink control channel in the cell having the lower transmission priority in accordance with the transmission priorities based on cell types determined for the respective cells.

4 . The user equipment as claimed in claim 3 , wherein if the uplink control channel transmitted in the cell having the lower transmission priority includes a redundant symbol, the transmission control unit reduces the transmit power for a slot including the redundant symbol.

5 . A transmission control method for use in user equipment transmitting and receiving a radio channel to/from a base station via multiple cells configured for carrier aggregation, comprising:
detecting occurrence of an event where an uplink control channel is to be transmitted in the multiple cells simultaneously; determining whether the uplink control channel can be transmitted in the multiple cells simultaneously; and transmitting the uplink control channel in the multiple cells simultaneously if the uplink control channel can be transmitted in the multiple cells simultaneously and controlling transmission of the uplink control channel in accordance with transmission priorities corresponding to cell types if the uplink control channel cannot be transmitted in the multiple cells simultaneously.

6 . User equipment, comprising:
a transmission and reception unit configured to transmit and receive a radio channel to/from a base station via multiple cells configured for carrier aggregation; a simultaneous transmission availability determination unit configured to determine, in response to occurrence of an event where an uplink control channel is to be transmitted in the multiple cells simultaneously, whether the uplink control channel can be transmitted in the multiple cells simultaneously; and a transmission control unit configured to instruct the transmission and reception unit to transmit the uplink control channel in the multiple cells simultaneously if the uplink control channel can be transmitted in the multiple cells simultaneously and control transmission of the uplink control channel in accordance with transmission priorities corresponding to duplex modes if the uplink control channel cannot be transmitted in the multiple cells simultaneously.

7 . The user equipment as claimed in claim 6 , wherein the transmission control unit has a duplex mode determination unit configured to determine which of a frequency division duplex (FDD) mode and a time division duplex (TDD) mode the duplex mode of the cell is, and the transmission control unit controls transmission of the uplink control channel in the determined cell depending on the determination.

8 . The user equipment as claimed in claim 7 , wherein the transmission control unit adjusts the transmission priority for a TDD mode applied cell depending on a number of uplink transmission timings specified by a TDD configuration for the cell.

9 . The user equipment as claimed in claim 7 , wherein the transmission control unit assigns a relatively large amount of transmit power to a cell having a higher transmission priority and assigns a relatively small amount of transmit power to a cell having a lower transmission priority or stops transmission of the uplink control channel in the cell having the lower transmission priority in accordance with the transmission priorities based on duplex modes determined for the respective cells.

10 . The user equipment as claimed in claim 9 , wherein if the uplink control channel transmitted in the cell having the lower transmission priority includes a redundant symbol, the transmission control unit reduces the transmit power for a slot including the redundant symbol.

11 . A transmission control method for use in user equipment transmitting and receiving a radio channel to/from a base station via multiple cells configured for carrier aggregation, comprising:
detecting occurrence of an event where an uplink control channel is to be transmitted in the multiple cells simultaneously; determining whether the uplink control channel can be transmitted in the multiple cells simultaneously; and transmitting the uplink control channel in the multiple cells simultaneously if the uplink control channel can be transmitted in the multiple cells simultaneously and controlling transmission of the uplink control channel in accordance with transmission priorities corresponding to duplex modes if the uplink control channel cannot be transmitted in the multiple cells simultaneously.

Assignees

• Ntt Docomo Inc

Inventors

• Uchino Tooru
• Takeda Kazuki
• Takahashi Hideaki
• Takeda Kazuaki

Classifications

• H04W72/566

  of the information or information source or recipient · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/14 Primary

  Two-way operation using the same type of signal, i.e. duplex · CPC title