# US 2018/0324792 A1 · User equipment and base station

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- Number: US 2018/0324792 A1
- Document ID: US20180324792A1
- Status: Published application
- Kind: A1
- Application number: 16/031,740
- Filed: 2018-07-10
- Published: 2018-11-08
- Earliest claimed: 2011-04-08
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Shohei Yamada
- Web page: https://patentgrep.com/patent/US20180324792A1

## CPC

- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 1/0618: {Space-time coding}
- H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)}
- H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)}
- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04W 76/40: for selective distribution or broadcast
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 1/1671: {the supervisory signal being transmitted together with control information}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A User Equipment (UE) configured for multi-group communications is described. The UE includes a processor and instructions stored in memory that is in electronic communication with the processor. The UE detects a plurality of cells. The UE also determines to use multiple groups of one or more cells. The UE further determines a primary secondary cell (PSCell) for a non-primary cell (non-PCell) group based on UE-specific radio resource control (RRC) signaling. The UE additionally receives information using the multiple groups.

## Claims

### Claim 1

A User Equipment (UE), comprising:
a computer processor;
a memory in electronic communication with the computer processor;
instructions stored in the memory, the instructions being executable by the computer processor to:
receive, from a base station, a radio resource control, RRC, message including a configuration to configure multiple groups, each of which is constituted by one or more serving cells; wherein
a serving cell which is included in one group of the multiple groups is a primary cell (PCell), and
a serving cell is included in another group of the multiple groups is a specific cell,
decode a physical downlink control channel (PDCCH) with a cyclic redundancy check (CRC) scrambled by a first random access radio network temporary identifier (RA-RNTI) in a common search space on the PCell; and
decode a physical downlink control channel (PDCCH) with a cyclic redundancy check (CRC) scrambled by a first random access radio network temporary identifier (RA-RNTI) in a common search space on the specific cell.

### Claim 2

A base station, comprising:
a computer processor;
a memory in electronic communication with the computer processor;
instructions stored in the memory, the instructions being executable by the computer processor to:
transmit, to a user equipment, a radio resource control, RRC, message including a configuration to configure multiple groups, each of which is constituted by one or more serving cells; wherein
a serving cell which is included in one group of the multiple groups is a primary cell (PCell), and
a serving cell is included in another group of the multiple groups is a specific cell,
transmit a physical downlink control channel (PDCCH) with a cyclic redundancy check (CRC) scrambled by a first random access radio network temporary identifier (RA-RNTI) in a common search space on the specific cell.

### Claim 3

A method performed by a User Equipment (UE) comprising:
receiving, from a base station, a radio resource control, RRC, message including a configuration to configure multiple groups, each of which is constituted by one or more serving cells; wherein
a serving cell which is included in one group of the multiple groups is a primary cell (PCell), and
a serving cell is included in another group of the multiple groups is a specific cell,
decoding a physical downlink control channel (PDCCH) with a cyclic redundancy check (CRC) scrambled by a first random access radio network temporary identifier (RA-RNTI) in a common search space on the PCell; and
decoding a physical downlink control channel (PDCCH) with a cyclic redundancy check (CRC) scrambled by a first random access radio network temporary identifier (RA-RNTI) in a common search space on the specific cell.

### Claim 4

A method performed by a base station comprising:
transmitting, to a user equipment, a radio resource control, RRC, message including a configuration to configure multiple groups, each of which is constituted by one or more serving cells; wherein
a serving cell which is included in one group of the multiple groups is a primary cell (PCell), and
a serving cell is included in another group of the multiple groups is a specific cell,
transmitting a physical downlink control channel (PDCCH) with a cyclic redundancy check (CRC) scrambled by a first random access radio network temporary identifier (RA-RNTI) in a common search space on the specific cell.