User terminal and radio communication method

Patent metadata

Field	Value
Publication number	US-12580698-B2
Application number	US-201917430499-A
Country	US
Kind code	B2
Filing date	Feb 14, 2019
Priority date	Feb 14, 2019
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

To properly consider the QCL assumption about SSBs in an NR-U carrier, a user terminal according to one aspect of the present disclosure is characterized by having a receiving section that receives a Synchronization Signal Block (SSB), and a control section which acquires an effective SSB index based on a demodulation reference signal (DeModulation Reference Signal (DMRS)) of a broadcast channel (Physical Broadcast Channel (PBCH)) included in the SSB, and from a payload of the PBCH, acquires at least one of information on the number of effective SSB indexes to be transmitted and a start location index of an SSB burst including the SSB within a Discovery Reference Signal (DRS) transmission window.

First claim

The invention claimed is:

1 . A terminal comprising:
a receiver that receives a synchronization signal block (SSB) based on a first higher layer parameter indicating a position of the SSB in a half frame; and a processor that obtains, from candidate SSB indexes, an SSB index used for quasi-co-location (QCL) assumption of a plurality of SSBs indicated by the first higher layer parameter within a discovery signal transmission window, based on information on a maximum number of the SSB index indicated by a second higher layer parameter, the information of the maximum number of the SSB index being common among the plurality of SSBs in an unlicensed frequency band, wherein the information on the maximum number of the SSB index indicated by the second higher layer parameter is transmitted commonly within the discovery signal transmission window.

2 . The terminal according to claim 1 , wherein the information is transmitted in master information block (MIB) transmitted on a physical broadcast channel (PBCH) included in the SSB.

3 . A radio communication method for a terminal, comprising:
receiving a synchronization signal block (SSB) based on a first higher layer parameter indicating a position of the SSB in a half frame; obtaining, from candidate SSB indexes, an SSB index used for quasi-co-location (QCL) assumption of a plurality of SSBs indicated by the first higher layer parameter within a discovery signal transmission window, based on information on a maximum number of the SSB index indicated by a second higher layer parameter, the information of the maximum number of the SSB index being common among the plurality of SSBs in an unlicensed frequency band; and wherein the information on the maximum number of the SSB index indicated by the second higher layer parameter is transmitted commonly within the discovery signal transmission window.

4 . A system comprising a terminal and a base station,
wherein the terminal comprises:
a receiver that receives a synchronization signal block (SSB) based on a first higher layer parameter indicating a position of the SSB in a half frame; and
a processor that obtains, from candidate SSB indexes, an SSB index used for quasi-co-location (QCL) assumption of a plurality of SSBs indicated by the first higher layer parameter within a discovery signal transmission window, based on information on a maximum number of the SSB index indicated by a second higher layer parameter, the information of the maximum number of the SSB index being common among the plurality of SSBs in an unlicensed frequency band, and
the base station comprises:
a transmitter that transmits the SSB,
wherein the information on the maximum number of the SSB index indicated by the second higher layer parameter is transmitted commonly within the discovery signal transmission window.

Assignees

• Ntt Docomo Inc

Inventors

• Harada Hiroki
• Murayama Daisuke

Classifications

• H04B17/373

  Predicting channel quality {or other radio frequency [RF]} parameters · CPC title

• H04W74/0808

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04W56/00

  Synchronisation arrangements · CPC title

• H04J11/0069

  Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655) · CPC title

• 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