Terminal, base station, radio communication method, and system for determining a physical downlink control channel monitoring occasion

Patent metadata

Field	Value
Publication number	US-12082256-B2
Application number	US-201817267374-A
Country	US
Kind code	B2
Filing date	Aug 10, 2018
Priority date	Aug 10, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A user terminal includes a receiving section that receives a signal in initial access or random access, and a control section that determines, based on reception of the signal, a specific signal quasi-co-located with a downlink control channel in a specific control resource set associated with a random access search space. According to an aspect of the present disclosure, monitoring of the downlink control channel can be appropriately controlled.

First claim

What is claimed is:

1. A terminal comprising:
a receiver that receives a system information block (SIB) 1 ; and
a processor that determines, for a search space having an index equal to 0 configured based on the SIB 1, a physical downlink control channel (PDCCH) monitoring occasion,
wherein the determined PDCCH monitoring occasion that is for the search space having the index equal to 0, the search space being configured based on the SIB 1, is associated with a synchronization signal (SS)/physical broadcast channel (PBCH) block selected in a contention-based Random Access (CBRA) procedure,
the processor monitors the determined PDCCH monitoring occasion, and
the processor assumes that a demodulation reference signal antenna port for PDCCH reception in a control resource set having an index equal to 0 is quasi-co-located with the SS/PBCH block.

2. A base station comprising:
a transmitter that transmits a system information block (SIB) 1; and
a processor that determines, for a search space having an index equal to 0 configured based on the SIB 1, a physical downlink control channel (PDCCH) monitoring occasion; and
wherein the processor determines that the PDCCH monitoring occasion that is for the search space having the index equal to 0, the search space being configured based on the SIB 1, is associated with a synchronization signal (SS)/physical broadcast channel (PBCH) block selected by a terminal in a contention-based Random Access (CBRA) procedure, and
a demodulation reference signal antenna port for PDCCH reception in a control resource set having a index equal to 0 is quasi-co-located with the SS/PBCH block.

3. A radio communication method for a terminal comprising:
receiving a system information block (SIB) 1;
determining, for a search space having an index equal to 0 configured based on the SIB 1, a physical downlink control channel (PDCCH) monitoring occasion,
wherein the determined PDCCH monitoring occasion that is for the search space having the index equal to 0, the search space being configured based on the SIB 1, is associated with a synchronization signal (SS)/physical broadcast channel (PBCH) block selected in a contention-based Random Access (CBRA) procedure;
monitoring the determined PDCCH monitoring occasion; and
assuming that a demodulation reference signal antenna port for PDCCH reception in a control resource set having a index equal to 0 is quasi-co-located with the SS/PBCH block.

4. A system comprising a base station and a terminal, wherein:
the base station comprises:
a transmitter that transmits a system information block (SIB) 1; and
a first processor that determines, for a search space having an index equal to 0 configured based on the SIB 1, a physical downlink control channel (PDCCH) monitoring occasion; and
wherein the first processor determines that the PDCCH monitoring occasion that is for the search space having the index equal to 0, the search space being configured based on the SIB 1, is associated with a synchronization signal (SS)/physical broadcast channel (PBCH) block selected by the terminal in a contention-based Random Access (CBRA) procedure; and

the terminal comprises:
a receiver that receives the SIB 1; and
a second processor that determines the PDCCH monitoring occasion,
wherein the second processor monitors the determined PDCCH monitoring occasion, and
the second processor assumes that a demodulation reference signal antenna port for PDCCH reception in a control resource set having an index equal to 0 is quasi-co-located with the SS/PBCH block.

Assignees

• Ntt Docomo Inc

Inventors

• Takeda Kazuki
• Ohara Tomoya
• Takahashi Hideaki
• Matsumura Yuki
• Nagata Satoshi
• Wang Lihui
• Hou Xiaolin

Classifications

• H04L5/0048 Primary

  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

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title

• H04W72/23

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

• H04W56/001

  Synchronization between nodes · CPC title