User equipments, base stations and methods

Patent metadata

Field	Value
Publication number	US-11147101-B2
Application number	US-201916244520-A
Country	US
Kind code	B2
Filing date	Jan 10, 2019
Priority date	Jan 11, 2018
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A user equipment (UE) is described. Receiving circuitry is configured to receive a radio resource control (RRC) message including first information used for indicating an index of a downlink bandwidth part (DL BWP) in a primary cell. Transmitting circuitry is configured to perform, based on an initiation of a random access procedure, the random access procedure. In a case that physical random access channel (PRACH) resources are not configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP in the primary cell and an UL BWP in the primary cell. An index of the DL BWP being defined as “0”, and an index of the UL BWP being defined as “0”.

First claim

What is claimed is:

1. A user equipment comprising:
receiving circuitry configured to receive a radio resource control (RRC) message including first information used for indicating an index of a downlink bandwidth part (DL BWP) in a primary cell,
the receiving circuitry configured to receive another RRC message comprising second information used for indicating an index of an uplink bandwidth part (UL BWP) in the primary cell, and
transmitting circuitry configured to perform, based on an initiation of a random access procedure, the random access procedure, wherein:
in a case that physical random access channel (PRACH) resources are not configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP being defined as index “0” in the primary cell and a UL BWP in the primary cell, and the random access procedure is not performed on the UL BWP unless the UL BWP is defined as index “0” and has a configured PRACH resource, and
in a case that PRACH resources are configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP in the primary cell and the active UL BWP in the primary cell, the DL BWP being linked with the active UL BWP based on the index of the DL BWP indicated by using the first information and the index of the UL BWP indicated by using the second information.

2. The user equipment according to claim 1 , wherein
the receiving circuitry is configured to receive system information comprising third information used for indicating a bandwidth of the DL BWP with the index “0” and a subcarrier spacing of the DL BWP with the index “0”, and
the receiving circuitry is configured to receive system information comprising fourth information used for indicating a bandwidth of the UL BWP with the index “0” and a subcarrier spacing of the UL BWP with the index “0”.

3. The user equipment according to claim 1 , wherein the DL BWP with the index “0” is activated and the UL BWP with the index “0” is activated.

4. A base station apparatus comprising:
transmitting circuitry configured to transmit a radio resource control (RRC) message including first information used for indicating an index of a downlink bandwidth part (DL BWP) in a primary cell,
the transmitting circuitry configured to transmit another RRC message comprising second information used for indicating an index of an uplink bandwidth part (UL BWP) in the primary cell, and
receiving circuitry configured to perform the random access procedure, wherein
in a case that physical random access channel (PRACH) resources are not configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP being defined as index “0” in the primary cell and a UL BWP in the primary cell, and the random access procedure is not performed on the UL BWP unless the UL BWP is defined as index “0” and has a configured PRACH resource, and
in a case that PRACH resources are configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP in the primary cell and the active UL BWP in the primary cell, the DL BWP being linked with the active UL BWP based on the index of the DL BWP indicated by using the first information and the index of the UL BWP indicated by using the second information.

5. The base station apparatus according to claim 4 , wherein
the transmitting circuitry is configured to transmit system information comprising third information used for indicating a bandwidth of the DL BWP with the index “0” and a subcarrier spacing of the DL BWP with the index “0”, and
the transmitting circuitry is configured to transmit system information comprising fourth information used for indicating a bandwidth of the UL BWP with the index “0” and a subcarrier spacing of the UL BWP with the index “0”.

6. The base station apparatus according to claim 4 , wherein the DL BWP with the index “0” is activated and the UL BWP with the index “0” is activated.

7. A communication method of a user equipment comprising:
receiving a radio resource control (RRC) message including first information used for indicating an index of a downlink bandwidth part (DL BWP) in a primary cell,
receiving another RRC message comprising second information used for indicating an index of an uplink bandwidth part (UL BWP) in the primary cell, and
performing, based on an initiation of a random access procedure, the random access procedure, wherein
in a case that physical random access channel (PRACH) resources are not configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP being defined as index “0” in the primary cell and a UL BWP in the primary cell, and the random access procedure is not performed on the UL BWP unless the UL BWP is defined as index “0” and has a configured PRACH resource, and
in a case that PRACH resources are configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP in the primary cell and the active UL BWP in the primary cell, the DL BWP being linked with the active UL BWP based on the index of the DL BWP indicated by using the first information and the index of the UL BWP indicated by using the second information.

8. The communication method according to claim 7 , further comprising:
receiving system information comprising third information used for indicating a bandwidth of the DL BWP with the index “0” and a subcarrier spacing of the DL BWP with the index “0”, and
receiving system information comprising fourth information used for indicating a bandwidth of the UL BWP with the index “0” and a subcarrier spacing of the UL BWP with the index “0”.

9. The communication method according to claim 7 , wherein the DL BWP with the index “0” is activated and the UL BWP with the index “0” is activated.

10. A communication method of a base station apparatus comprising:
transmitting a radio resource control (RRC) message including first information used for indicating an index of a downlink bandwidth part (DL BWP) in a primary cell,
transmitting another RRC message comprising second information used for indicating an index of an uplink bandwidth part (UL BWP) in the primary cell, and
performing the random access procedure, wherein
in a case that physical random access channel (PRACH) resources are not configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP being defined as index “0” in the primary cell and a UL BWP in the primary cell, and the random access procedure is not performed on the UL BWP unless the UL BWP is defined as index “0” and has a configured PRACH resource, and
in a case that PRACH resources are configured for an active UL BWP in the primary cell, the random access procedure is performed on a DL BWP in the primary cell and the active UL BWP in the primary cell, the DL BWP being linked with the active UL BWP based on the index of the DL BWP indicated by using the first information and the indicated index of the UL BWP indicated by using the second information.

11. The communication method according to claim 10 , further comprising:
transmitting system information comprising third information used for indicating a bandwidth of the DL BWP with the index “0” and a subcarrier spacing of the DL BWP with the index “0”, and
transmitting system information comprising fourth information used for indicating a bandwidth of the UL BWP with the index “0” and a subcarrier spacing of the UL BWP with the index “0”.

12. The communication method according to claim 10 , wherein the DL BWP with the index “0” is activated and the UL BWP with the index “0” is

Assignees

• Sharp Laboratories America Inc
• Fg innovation co ltd
• Sharp Kk

Inventors

• Aiba Tatsushi
• Yin Zhanping

Classifications

• H04W74/0833 Primary

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

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04W48/12

  using downlink control channel · CPC title

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title