# US 12,114,182 B2 · Base station, radio terminal, and methods therein

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- Number: US 12,114,182 B2
- Document ID: US12114182B2
- Status: Granted
- Kind: B2
- Application number: 17/829,763
- Filed: 2022-06-01
- Published: 2022-09-15
- Granted: 2024-10-08
- Earliest claimed: 2015-11-05
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Hisashi Futaki
- Web page: https://patentgrep.com/patent/US12114182B2

## CPC

- H04W 24/02: Arrangements for optimising operational condition
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04W 28/04: Error control
- H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)}
- H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00)
- H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC]
- H04W 48/12: using downlink control channel
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- 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 radio terminal (1) receives from a base station (2) a first value (601) of a first radio resource configuration information element. The first value (601) is associated with normal coverage or with a first coverage enhancement level. The radio terminal (1) derives a second value (604) of the first radio resource configuration information element by converting (603) the first value (601) using a value of a conversion factor (602). The second value (604) is associated with a second coverage enhancement level. It is thus, for example, possible to contribute to reduction of data size necessary for the base station to notify the radio terminal of a plurality of radio resource configurations for a plurality of coverage enhancement levels.

## Claims

### Claim 1

A base station comprising:
a memory; and
at least one processor coupled to the memory, wherein the at least one processor is configured to:
broadcast system information, the system information including a first value of a ra-ResponseWindowSize and at least one multiplier factor corresponding to a coverage enhancement level;
receive a Random Access (RA) preamble from a User Equipment (UE) in the coverage enhancement level, the UE performing radio communication according to Narrow Band-Internet of Things (NB-IoT); and;
in response to the received RA preamble, transmit a RA Response (RAR) to the UE,
wherein the RAR is received within a RA Response Window whose length is indicated by a second value of the ra-ResponseWindowSize,
wherein the second value of the ra-ResponseWindowSize is derived by multiplying the first value of the ra-ResponseWindowSize with the at least one multiplier factor corresponding to the coverage enhancement level, and
wherein the at least one multiplier factor is also configured as a value corresponding to a number of repetitions for the RAR of a random access procedure.

### Claim 2

A method for a base station, the method comprising:
broadcasting system information, the system information including a first value of a ra-ResponseWindowSize and at least one multiplier factor corresponding to a coverage enhancement level;
receiving a Random Access (RA) preamble from a User Equipment (UE) in the coverage enhancement level, the UE performing radio communication according to Narrow Band-Internet of Things (NB-IoT); and
in response to the received RA preamble, transmitting a RA Response (RAR) to the UE,
wherein the RAR is received within a RA Response Window whose length is indicated by a second value of the ra-ResponseWindowSize,
wherein the second value of the ra-ResponseWindowSize is derived by multiplying the first value of the ra-ResponseWindowSize with the at least one multiplier factor corresponding to the coverage enhancement level, and
wherein the at least one multiplier factor is also configured as a value corresponding to a number of repetitions for the RAR of a random access procedure.

### Claim 3

A User Equipment (UE) comprising:
a memory; and
at least one processor coupled to the memory, wherein the at least one processor is configured to:
receive system information from a base station, the system information including a first value of a ra-ResponseWindowSize and at least one multiplier factor corresponding to a coverage enhancement level;
transmit a Random Access (RA) preamble to the base station in the coverage enhancement level, the UE performing radio communication according to Narrow Band-Internet of Things (NB-IoT); and
receive a RA Response (RAR) from the base station, in response to the transmitting the RA preamble, within a RA Response Window whose length is indicated by a second value of the ra-ResponseWindowSize,
wherein the second value of the ra-ResponseWindowSize is derived by multiplying the first value of the ra-ResponseWindowSize with the at least one multiplier factor corresponding to the coverage enhancement level, and
wherein the at least one multiplier factor is also configured as a value corresponding to a number of repetitions for the RAR of a random access procedure.

### Claim 4

A method for a User Equipment (UE), the method comprising:
receiving system information from a base station, the system information including a first value of a ra-ResponseWindowSize and at least one multiplier factor corresponding to a coverage enhancement level;
transmitting a Random Access (RA) preamble to the base station in the coverage enhancement level, the UE performing radio communication according to Narrow Band-Internet of Things (NB-IoT); and
receiving a RA Response (RAR) from the base station, in response to the transmitting the RA preamble, within a RA Response Window whose length is indicated by a second value of the ra-ResponseWindowSize,
wherein the second value of the ra-ResponseWindowSize is derived by multiplying the first value of the ra-ResponseWindowSize with the at least one multiplier factor corresponding to the coverage enhancement level, and
wherein the at least one multiplier factor is also configured as a value corresponding to a number of repetitions for the RAR of a random access procedure.