# US 2022/0286325 A1 · Method and system for managing an intersymbol interference in an ultra-high frequency cellular network

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2022/0286325 A1
- Document ID: US20220286325A1
- Status: Published application
- Kind: A1
- Application number: 17/687,419
- Filed: 2022-03-04
- Published: 2022-09-08
- Earliest claimed: 2021-03-04
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Anusha GUNTURU; Ashok Kumar Reddy CHAVVA; Sandeep JOSHI
- Web page: https://patentgrep.com/patent/US20220286325A1

## CPC

- H04L 25/03006: {Arrangements for removing intersymbol interference}
- H04L 25/0202: {Channel estimation}
- 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)}
- H04L 27/2607: {Cyclic extensions}
- H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

In an embodiment, a method of a base station (BS) for managing an ISI in a cellular network is disclosed. The method includes receiving at least one UE-Capability information element from a UE comprising a list of CP lengths and a list of SCSs, determining a plurality of parameters associated with the UE based on the list of CP lengths and the list of SCSs, calculating at least one of a first custom CP length and a first SCS based on the plurality of parameters from the list of CP lengths and the list of SCSs, and transmitting, to the UE, a response message indicating that at least one of the first custom CP length and the first SCS is selected for managing the ISI.

## Claims

### Claim 1

A method of a base station (BS) for managing an inter-symbol interference (ISI) in a cellular network, the method comprising:
receiving, from a user equipment (UE), at least one UE-capability information element comprising a list of cycle prefix (CP) lengths and a list of sub-carriers spaces (SCSs);
determining a plurality of parameters associated with the UE based on the list of CP lengths and the list of SCSs;
calculating at least one of a first custom CP length and a first SCS based on the plurality of parameters from the list of CP lengths and the list of SCSs; and
transmitting, to the UE, a response message indicating that at least one of the first custom CP length or the first SCS is selected for managing the ISI.

### Claim 2 (depends on 1)

The method of claim 1, wherein the list of CP lengths comprises a normal CP length and one or more extended CP lengths associated with an orthogonal frequency-division multiplexing (OFDM) symbol duration.

### Claim 3 (depends on 1)

The method of claim 1, wherein the plurality of parameters comprises at least one of channel information, a speed of the UE, a mobility of the UE, a channel state information (CSI) feedback, a delay spread of a channel, a doppler spread/shift in the channel, or at least one parameter derived from the channel information.

### Claim 4 (depends on 1)

The method of claim 1, further comprising transmitting the response message using one of:
downlink control information (DCI) format comprising at least one of an identifier of the DCI format for at least one of the first custom CP length and the first SCS, a number of bits associated with at least one of the first custom CP length and the first SCS, a description indicating at least one of the first custom CP length and the first SCS;
a radio resource control reconfiguration comprising at least one of the first custom CP length and the first SCS;
a master information block (MIB) comprising at least one of the first custom CP length and the first SCS; and
a medium access control element (MAC CE) comprising a bitmap associated with at least one of the first custom CP length and the first SCS, wherein each bit of the bitmap represents a subset for a CP length value associated with the first custom CP length and a SCS value associated with the first SCS.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
indicating a default CP and a default SCS for initiating a random access channel (RACH) procedure using one of an MIB and a RACHConfigCommon message; and
instructing the UE to indicate capability of the UE for a plurality of SCSs and a plurality of CP lengths through at least one UE-capability information element when the RACH procedure is completed.

### Claim 6 (depends on 5)

The method of claim 5, the method further comprises:
indicating a change associated with at least one of the default CP and the default SCS for one or more of an uplink (UL) transmission and a downlink (DL) transmission, wherein the change is indicated when indicating the default CP and the default SCS for the UE;
initiating the RACH procedure with the UE when indicating the default CP and the default SCS for the UE;
indicating, to the UE, at least one of the first custom CP length or the first SCS is selected for managing the ISI;
receiving, from the UE, at least one of a second custom CP length and a second SCS for managing the ISI, wherein the BS receives the at least one of the second custom CP length and the second SCS through one of a physical uplink control channel (PUCCH) format or a physical uplink shared channel (PUSCH) format; and
indicating, to the UE, a configuration of at least one of the second custom CP length and the second SCS using one of a physical downlink control channel (PDCCH) with a second DCI and a plurality of reserved bits of a first DCI,
wherein each SCS among the plurality of SCSs, and each CP length among the plurality of CP lengths is supported by the UE.

### Claim 7 (depends on 6)

The method of claim 6, wherein at least one of the second custom CP length or the second SCS is calculated by:
determining, by the UE that a channel estimation parameter associated with the UE is less than a pre-determined threshold value when the UE uses at least one of the first custom CP length or the first SCS, wherein the channel estimation parameter corresponds to a delay spread of a channel for a high frequency communication; and
calculating, by the UE, that at least one of the second custom CP length and the second SCS in response to determining that the channel estimation parameter is less than the pre-determined threshold value.

### Claim 8 (depends on 7)

The method of claim 7, further comprises:
receiving an UL CSI to identify the delay spread of the channel in response to indicating to the UE that at least one of the first custom CP length or the first SCS is selected for managing the ISI;
determining that the channel estimation parameter associated with the UE is less than the pre-determined threshold value when using at least one of the first custom CP length or the first SCS, wherein the channel estimation parameter corresponds to the delay spread of the channel for the high frequency communication;
calculating at least one of the second custom CP length and the second SCS in response to determining that the channel estimation parameter is less than the pre-determined threshold value; and
transmitting, to the UE, at least one of the second custom CP length and the second SCS for managing the ISI through one of a PDCCH with a second DCI and a plurality of reserved bits of a first DCI.

### Claim 9

A method of a UE for managing an inter-symbol interference (ISI) in a high frequency cellular network, the method comprising:
connecting with a base station (BS) using at least one of a first custom cyclic prefix (CP) length and a first sub-carrier spacing (SCS) when receiving a response message, wherein the response message comprises at least one of the first custom CP length or the first SCS calculated by the BS;
determining that a channel estimation parameter associated with the UE is less than a pre-determined threshold value when using at least one of the first custom CP length and the first SCS, wherein the channel estimation parameter corresponds to a delay spread of a channel for a high frequency communication;
calculating at least one of a second custom CP length and a second SCS in response to determining that the channel estimation parameter is less than the pre-determined threshold value; and
transmitting, to the BS, at least one of the second custom CP length and the second SCS for managing the ISI through one of a physical uplink control channel (PUCCH) format or a physical uplink shared channel (PUSCH) format.

### Claim 10 (depends on 9)

The method of claim 9, further comprises:
receiving, from the BS, an indication for a configuration of at least one of the second custom CP length or the second SCS, wherein the UE receives the indication through one of a physical downlink control channel (PDCCH) with a second downlink control information (DCI) and a plurality of reserved bits of a first DCI.

### Claim 11

A base station (BS) for managing an inter-symbol interference (ISI) in a cellular network, the BS comprising:
a transceiver; and
at least one processor operably coupled to the transceiver, wherein the at least one processor is configured to:
receive at least one user equipment (UE)-capability information element comprising a list of cycle prefix (CP) lengths and a list of sub-carriers spaces (SCSs);
determine a plurality of parameters associated with the UE based on the list of CP lengths and the list of SCSs;
calculate at least one of a first custom CP length and a first SCS based on the plurality of parameters from the list of CP lengths and the list of SCS; and
transmit, to the UE, a response message indicating that at least one of the first custom CP length or the first SCS is selected for managing the ISI.

### Claim 12 (depends on 11)

The BS of claim 11, wherein the list of CP lengths comprises a normal CP length and one or more extended CP lengths associated with an orthogonal frequency-division multiplexing (OFDM) symbol duration.

### Claim 13 (depends on 11)

The BS of claim 11, wherein the plurality of parameters comprises at least one of channel information, speed of the UE, a mobility of the UE, a channel state information (CSI) feedback, a delay spread of a channel, a doppler spread/shift in the channel, or at least one parameter derived from the channel information.

### Claim 14 (depends on 11)

The BS of claim 11, wherein the at least one processor is configured to transmit, to the UE, the response message using one of:
a downlink control information (DCI) format comprising at least one of an identifier of the DCI format for at least one of the first custom CP length and the first SCS, a number of bits associated with at least one of the first custom CP length and the first SCS, a description indicating at least one of the first custom CP length and the first SCS;
a radio resource control reconfiguration comprising at least one of the first custom CP length and the first SCS;
a master information block (MIB) comprising at least one of the first custom CP length and the first SCS; and
a medium access control element (MAC CE) comprising a bitmap associated with at least one of the first custom CP length and the first SCS, each bit of the bitmap representing a subset for a CP length value associated with the first custom CP length and a SCS value associated with the first SCS.

### Claim 15 (depends on 11)

The BS of claim 11, wherein the at least one processor is further configured to:
indicate a default CP and a default SCS for initiating a random access channel (RACH) procedure using one of an MIB and a RACHConfigCommon message; and
instructing the UE to indicate capability of the UE for a plurality of SCSs and a plurality of CP lengths through at least one UE-capability information element when the RACH procedure is completed.

### Claim 16 (depends on 15)

The BS of claim 15, wherein:
each SCS among the plurality of SCSs, and each CP length among the plurality of CP lengths is supported by the UE;
wherein the at least one processor is further configured to:
indicate a change associated with at least one of the default CP and the default SCS for one or more of an uplink (UL) transmission and a downlink (DL) transmission, wherein the change is indicated when indicating the default CP and the default SCS for the UE;
initiate the RACH procedure with the UE when indicating the default CP and the default SCS for the UE;
indicate, to the UE (202), that at least one of the first custom CP length or the first SCS is selected for managing the ISI;
the at least one processor is further configured to receive from the UE, at least one of a second custom CP length and a second SCS for managing the ISI, wherein the BS receives the at least one of the second custom CP length and the second SCS through one of a physical uplink control channel (PUCCH) format or a physical uplink shared channel (PUSCH) format; and
the at least one processor is further configured to indicate, to the UE, a configuration of at least one of the second custom CP length and the second SCS using one of a physical downlink control channel (PDCCH) with a second DCI and a plurality of reserved bits of a first DCI.

### Claim 17 (depends on 16)

The BS of claim 16, wherein the at least one processor is further configured, for calculating at least one of the second custom CP length or the second SCS, to:
determine that a channel estimation parameter associated with the UE is less than a pre-determined threshold value when the UE uses at least one of the first custom CP length or the first SCS, wherein the channel estimation parameter corresponds to a delay spread of a channel for a high frequency communication; and
calculate that at least one of the second custom CP length and the second SCS in response to determining that the channel estimation parameter is less than the pre-determined threshold value.

### Claim 18 (depends on 17)

The BS of claim 17, wherein:
the at least one processor is further configured to:
receive an UL CSI to identify the delay spread of the channel in response to indicating to the UE that at least one of the first custom CP length or the first SCS is selected for managing the ISI;
determine that the channel estimation parameter associated with the UE is less than the pre-determined threshold value when using at least one of the first custom CP length or the first SCS, the channel estimation parameter corresponding to the delay spread of the channel for the high frequency communication;
calculate at least one of the second custom CP length and the second SCS in response to determining that the channel estimation parameter is less than the pre-determined threshold value; and
transmit, to the UE, at least one of the second custom CP length and the second SCS for managing the ISI through one of a PDCCH with a second DCI and a plurality of reserved bits of a first DCI.

### Claim 19

A user equipment (UE) for managing an inter-symbol interference (ISI) in a cellular network, the UE comprising:
a transceiver; and
at least one processor operably coupled to the transceiver, wherein the at least one processor is configured to
connect with a base station (BS) using at least one of a first custom cyclic prefix (CP) length and a first sub-carrier spacing (SCS) when receiving a response message, wherein the response message comprises at least one of the first custom CP length or the first SCS calculated by the BS;
determine that a channel estimation parameter associated with the UE is less than a pre-determined threshold value when using at least one of the first custom CP length and the first SCS, wherein the channel estimation parameter corresponds to a delay spread of a channel for a high frequency communication;
calculate at least one of a second custom CP length and a second SCS in response to determining that the channel estimation parameter is less than the pre-determined threshold value; and
transmit, to the BS, at least one of the second custom CP length and the second SCS for managing the ISI through one of a physical uplink control channel (PUCCH) format and a physical uplink shared channel (PUSCH) format.

### Claim 20 (depends on 19)

The UE of claim 19, wherein the transceiver is further configured to:
receive, from the BS, an indication for a configuration of at least one of the second custom CP length or the second SCS, the UE receiving the indication through one of a physical downlink control channel (PDCCH) with a second downlink control information (DCI) and a plurality of reserved bits of a first DCI.