# US 12,120,621 B2 · Enabling multiple numerologies in a network

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- Number: US 12,120,621 B2
- Document ID: US12120621B2
- Status: Granted
- Kind: B2
- Application number: 18/099,694
- Filed: 2023-01-20
- Published: 2023-05-18
- Granted: 2024-10-15
- Earliest claimed: 2023-01-20
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Robert Baldemair; Sorour Falahati; Daniel Larsson; Stefan Parkvall
- Web page: https://patentgrep.com/patent/US12120621B2

## CPC

- H04W 56/0015: {one node acting as a reference for the others}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04W 48/12: using downlink control channel
- H04J 11/0069: {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)}
- 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)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

There is presented a method for enabling multiple numerologies in a network. The method is performed by a user equipment (UE) and comprises receiving system information in a first search space on a broadcast channel with a first numerology, determining a second search space from the received system information, and receiving further information in the second search space with a second numerology. A UE, a base station, a computer program, and a computer program device are also presented.

## Claims

### Claim 1

A method for enabling multiple numerologies corresponding to different subcarrier spacings in a wireless network, the method being performed by a user equipment (UE) and comprising:
determining, based on a carrier frequency used by a base station of the wireless network, a first numerology to use for receiving a broadcast channel transmitted by the base station;
receiving the broadcast channel according to the first numerology, wherein a time-domain placement of the broadcast channel is determined by the first numerology;
determining, from system information provided on the broadcast channel, a common search space and a second numerology used by the base station for transmitting control information in the common search space, the second numerology different than the first numerology;
receiving, according to the second numerology, a Physical Downlink Control Channel (PDCCH) in the common search space; and
determining, from further system information provided on the PDCCH, an additional search space for receiving a further PDCCH.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the further PDCCH is associated with a third numerology that is different from the second numerology.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising receiving the further PDCCH in the additional search space and obtaining corresponding control information therefrom.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising receiving synchronization information for the broadcast channel, prior to receiving on the broadcast channel.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the broadcast channel is received by the UE in a first subcarrier region, the PDCCH is received in a second subcarrier region that contains the common search space, and the further PDCCH is received in a third subcarrier region that contains the additional search space.

### Claim 6

A method for enabling multiple numerologies corresponding to different subcarrier spacings in a wireless network, the method being performed by a base station (BS) and comprising:
transmitting a broadcast channel via a carrier having a carrier frequency, the broadcast channel transmitted using a first numerology that is associated with the carrier frequency and providing system information indicating a common search space and a second numerology that is different than the first numerology, wherein a time-domain placement of the broadcast channel is determined by the first numerology; and
transmitting a Physical Downlink Control Channel (PDCCH) for a user equipment (UE), the PDCCH transmitted in the common search space using the second numerology and providing further system information indicating to the UE an additional search space for transmitting a further PDCCH for the UE.

### Claim 7 (depends on 6)

The method according to claim 6, further comprising transmitting the further PDCCH for the UE in the additional search space, using a third numerology that is different than the second numerology.

### Claim 8

A user equipment (UE) supporting multiple numerologies corresponding to different subcarrier spacings in a wireless network, the UE comprising:
a processor; and
a memory storing computer program instructions that, when executed by the processor, cause the UE to:
determine, based on a carrier frequency used by a base station of the wireless network, a first numerology to use for receiving a broadcast channel transmitted by the base station;
receive broadcast channel according to the first numerology, wherein a time-domain placement of the broadcast channel is determined by the first numerology;
determine, from system information provided on the broadcast channel, a common search space and a second numerology used by the base station for transmitting control information in the common search space, the second numerology different than the first numerology;
receive, according to the second numerology, a Physical Downlink Control Channel (PDCCH) in the common search space; and
determine, from further system information providing on the PDCCH, an additional search space for receiving a further PDCCH.

### Claim 9

A base station (BS) supporting multiple numerologies corresponding to different subcarrier spacings in a wireless network, the BS comprising:
a processor; and
a memory storing computer program instructions that, when executed by the processor, cause the BS to:
transmit a broadcast channel via a carrier having a carrier frequency, the broadcast channel transmitted using a first numerology that is associated with the carrier frequency and providing system information indicating a common search space and a second numerology that is different than the first numerology, and wherein a time-domain placement of the broadcast channel is determined by the first numerology; and
transmit a Physical Downlink Control Channel (PDCCH) for a user equipment (UE), the PDCCH transmitted in the common search space using the second numerology and providing further system information indicating to the UE an additional search for transmitting a further PDCCH for the UE.