User equipment

Patent metadata

Field	Value
Publication number	US-11375465-B2
Application number	US-201917040179-A
Country	US
Kind code	B2
Filing date	Apr 10, 2019
Priority date	Apr 17, 2018
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

In one aspect of the present invention, user equipment includes a reception unit configured to receive first system information in a frequency block where a synchronization signal is placed and third system information in another frequency block; and a control unit configured to stop detecting the synchronization signal, (1) based on a parameter value determined from the first system information, (1-1) when a control channel search space for receiving second system information does not exist and (1-2) when the parameter value is within a predetermined range and (2) when the control channel search space for receiving the second system information does not exist based on a parameter value determined from the third system information.

First claim

The invention claimed is:

1. A terminal, comprising:
a receiver that receives first system information in a frequency block where a synchronization signal is placed and third system information in another frequency block; and
a processor that stops detecting the synchronization signal, (1) based on a parameter value determined from the first system information, (1-1) when a control channel search space for receiving second system information does not exist and (1-2) when the parameter value is within a certain range and (2) when the control channel search space for receiving the second system information does not exist based on a parameter value determined from the third system information.

2. The terminal as claimed in claim 1 , wherein the processor assumes that a synchronization signal to be detected does not exist until detection of a synchronization signal in a frequency range that is at least part of a carrier frequency band is completed.

3. The terminal as claimed in claim 2 , wherein the processor assumes that a synchronization signal to be detected does not exist in a frequency range that is at least part of a carrier frequency band until a certain condition is satisfied, (1) based on the parameter value determined from the first system information, (1-1) when the control channel search space for receiving the second system information does not exist and (1-3) when the parameter value is not within the certain range.

4. The terminal as claimed in claim 2 , wherein the first system information is master information block (MIB), the second system information is system information transmitted on a shared channel, and the control channel search space is a physical downlink control channel (PDCCH) search space to be detected in common by terminals in a cell.

5. The terminal as claimed in claim 1 , wherein the processor assumes that a synchronization signal to be detected does not exist in a frequency range that is at least part of a carrier frequency band until a certain condition is satisfied, (1) based on the parameter value determined from the first system information, (1-1) when the control channel search space for receiving the second system information does not exist and (1-3) when the parameter value is not within the certain range.

6. The terminal as claimed in claim 5 , wherein the processor assumes that the synchronization signal to be detected does not exist in the frequency range until a certain time period has elapsed.

7. The terminal as claimed in claim 6 , wherein the processor resumes detection of the synchronization signal in the frequency range after the certain condition is satisfied.

8. The terminal as claimed in claim 6 , wherein the first system information is master information block (MIB), the second system information is system information transmitted on a shared channel, and the control channel search space is a physical downlink control channel (PDCCH) search space to be detected in common by terminals in a cell.

9. The terminal as claimed in claim 5 , wherein the processor resumes detection of the synchronization signal in the frequency range after the certain condition is satisfied.

10. The terminal as claimed in claim 9 , wherein the first system information is master information block (MIB), the second system information is system information transmitted on a shared channel, and the control channel search space is a physical downlink control channel (PDCCH) search space to be detected in common by terminals in a cell.

11. The terminal as claimed in claim 5 , wherein the first system information is master information block (MIB), the second system information is system information transmitted on a shared channel, and the control channel search space is a physical downlink control channel (PDCCH) search space to be detected in common by terminals in a cell.

12. The terminal as claimed in claim 1 , wherein the first system information is master information block (MIB), the second system information is system information transmitted on a shared channel, and the control channel search space is a physical downlink control channel (PDCCH) search space to be detected in common by terminals in a cell.

13. A synchronization signal detection method in a terminal, comprising:
receiving first system information in a frequency block where a synchronization signal is placed and third system information in another frequency block; and
stopping detecting the synchronization signal, (1) based on a parameter value determined from the first system information, (1-1) when a control channel search space for receiving second system information does not exist and (1-2) when the parameter value is within a certain range and (2) when the control channel search space for receiving the second system information does not exist based on a parameter value determined from the third system information.

Assignees

• Ntt Docomo Inc

Inventors

• Takahashi Hideaki
• Harada Hiroki

Classifications

• H04W72/23

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

• Y02D30/70

  in wireless communication networks · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W48/16

  Discovering, processing access restriction or access information · CPC title

• H04J11/0076

  Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group · CPC title