Terminal and base station apparatus

Patent metadata

Field	Value
Publication number	US-11350403-B2
Application number	US-201817051024-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	May 15, 2018
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A terminal includes a processor, coupled to a transceiver, that monitors a PDCCH (Physical downlink control channel) candidate in a first search space during a random access procedure. The transceiver receives a random access response or a PDSCH (Physical downlink shared channel) for contention resolution from a base station, based on information included in the PDCCH candidate, and the transceiver receives a PDSCH or transmit an uplink signal based on information included in a PDCCH candidate monitored in the first search space, unless a second search space of a type other than the first search space is configured after the random access procedure is completed.

First claim

The invention claimed is:

1. A terminal comprising:
a processor, coupled to a transceiver, that monitors a PDCCH (Physical downlink control channel) candidate in a first search space during a random access procedure; and
wherein the transceiver receives a random access response or a PDSCH (Physical downlink shared channel) for contention resolution from a base station, based on information included in the PDCCH candidate, and
wherein the transceiver receives a PDSCH or transmit an uplink signal based on information included in a PDCCH candidate monitored in the first search space, unless a second search space of a type other than the first search space is configured after the random access procedure is completed.

2. The terminal as claimed in claim 1 , wherein the processor starts to monitor the first search space from a time point of starting a window for receiving the random access response or a time point of starting to monitor a PDCCH candidate, and wherein the processor uses a PDCCH candidate including CRC (Cyclic redundancy check) scrambled by RA-RNTI (Random Access-Radio Network Temporary Identifier) for receiving the random access response.

3. The terminal as claimed in claim 1 , wherein the processor terminates monitoring the first search space at a time point of having the second search space configured.

4. A base station apparatus comprising:
a transceiver, coupled to a processor, that transmits, to a terminal, a downlink signal configured with a PDCCH (Physical downlink control channel) candidate in a first search space during a random access procedure,
wherein the transceiver transmits a random access response or a PDSCH (Physical downlink shared channel) for contention resolution to the terminal, based on information included in the PDCCH candidate, and
wherein the transceiver transmits a PDSCH or receives an uplink signal based on information included in a PDCCH candidate monitored in the first search space, unless the processor configures a second search space of a type other than the first search space to the terminal after the random access procedure is completed.

5. A communicating method comprising:
monitoring, by a terminal, a PDCCH (Physical downlink control channel) candidate in a first search space during a random access procedure;
receiving, by the terminal, a random access response or a PDSCH (Physical downlink shared channel) for contention resolution from a base station apparatus, based on information included in the PDCCH candidate; and
the monitoring includes receiving a PDCCH or transmitting an uplink signal based on information included in a PDCCH candidate monitored in the first search space, unless a second search space of a type other than the first search space is configured after the random access procedure is completed.

Assignees

• Ntt Docomo Inc

Inventors

• Ohara Tomoya
• Harada Hiroki

Classifications

• H04W72/23 Primary

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

• H04W74/002

  Transmission of channel access control information · CPC title

• H04L5/0044 Primary

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title