# US 11,452,160 B2 · Radio terminal, base station, and method therefor

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- Number: US 11,452,160 B2
- Document ID: US11452160B2
- Status: Granted
- Kind: B2
- Application number: 16/848,381
- Filed: 2020-04-14
- Published: 2020-09-10
- Granted: 2022-09-20
- Earliest claimed: 2016-05-12
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Hisashi Futaki
- Web page: https://patentgrep.com/patent/US11452160B2

## CPC

- H04W 76/19: Connection re-establishment
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 80/02: Data link layer protocols
- H04W 80/08: Upper layer protocols {(network arrangements or communication protocols for networked applications H04L67/00)}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A radio terminal (1) determines (201) (a) a pathloss level between the radio terminal (1) and a base station (2), (b) a coverage enhancement level based on the pathloss level, or (c) a coverage enhancement mode configured in the radio terminal (1). The radio terminal chooses (202) between non-truncated first information and truncated first information, having a smaller bit length than the non-truncated first information, to be included in an initial uplink Radio Resource Control (RRC) message transmitted within a random access procedure, based on the determined pathloss level, the determined coverage enhancement level, or the determined coverage enhancement mode. This contributes to, for example, enabling a base station to easily know the Msg3 size desired by a radio terminal.

## Claims

### Claim 1

A radio terminal comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine (a) a pathloss level between the radio terminal and a base station, (b) a coverage enhancement level based on the pathloss level, or (c) a coverage enhancement mode configured in the radio terminal;
change a size of an initial uplink Radio Resource Control (RRC) message transmitted within a random access procedure, based on the determined pathloss level, the coverage enhancement level, or the coverage enhancement mode; and
change a type of Information Element (IE) or a number of IEs to be contained in the initial uplink RRC message, to change the size of the initial uplink RRC message,
wherein the type of Information Element (IE) is a type of Resume ID.

### Claim 2

A method performed by a radio terminal, the method comprising:
determining (a) a pathloss level between the radio terminal and a base station, (b) a coverage enhancement level based on the pathloss level, or (c) a coverage enhancement mode configured in the radio terminal;
changing a size of an initial uplink Radio Resource Control (RRC) message transmitted within a random access procedure, based on the determined pathloss level, the coverage enhancement level, or the coverage enhancement mode; and
changing a type of Information Element (IE) or a number of IEs to be contained in the initial uplink RRC message, to change the size of the initial uplink RRC message,
wherein the type of Information Element (IE) is a type of Resume ID.