# US 11,445,456 B2 · Method and apparatus for RMSI reception for low cost UEs in NR

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- Number: US 11,445,456 B2
- Document ID: US11445456B2
- Status: Granted
- Kind: B2
- Application number: 16/946,408
- Filed: 2020-06-19
- Published: 2021-01-07
- Granted: 2022-09-13
- Earliest claimed: 2019-07-03
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Qiongjie Lin; Hongbo Si; Aris Papasakellariou
- Web page: https://patentgrep.com/patent/US11445456B2

## CPC

- H04W 56/001: {Synchronization between nodes}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0025: {Transmission of mode-switching indication}
- H04L 1/0061: {Error detection codes}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 5/10: with dynamo-electric generation of carriers; with mechanical filters or demodulators
- H04W 68/005: {Transmission of information for alerting of incoming communication}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/1273: of downlink data flows
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/30: Resource management for broadcast services
- H04W 72/53: based on regulatory allocation policies
- H04W 76/11: Allocation or use of connection identifiers
- H04L 2001/0093: {Point-to-multipoint}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0838: using contention-free random access [CFRA]
- 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 method and apparatus of a user equipment (UE) are provided. The method and apparatus comprise receiving a synchronization signal/physical broadcast channel (SS/PBCH) block that includes configuration information for one or more search space sets and determining scheduling information for a first physical downlink shared channel (PDSCH) reception based on one of: a first downlink control information (DCI) format associated with a first search space set from the one or more search space sets, wherein the first DCI format includes the scheduling information for the first PDSCH reception and for a second PDSCH reception, or a second DCI format associated with a second search space set from the one or more search space sets, wherein the second DCI format includes the scheduling information for the first PDSCH reception. The method and apparatus of the UE further comprise receiving the first PDSCH based on the scheduling information.

## Claims

### Claim 1

A user equipment (UE) comprising:
a transceiver configured to receive a synchronization signal/physical broadcast channel (SS/PBCH) block that includes configuration information for one or two search space sets; and
a processor operably coupled to the transceiver, the processor configured to determine scheduling information for a reception of a first physical downlink shared channel (PDSCH) based on:
when the configuration information is for the one search space set, a first downlink control information (DCI) format associated with a first search space set from the one or two search space sets, wherein the first DCI format includes the scheduling information for the first PDSCH reception and for a second PDSCH reception, and
when the configuration information is for the two search space sets, a second DCI format associated with a second search space set from the one or two search space sets, wherein the second DCI format includes the scheduling information for the first PDSCH reception,
wherein the transceiver is further configured to receive the first PDSCH based on the scheduling information.

### Claim 2 (depends on 1)

The UE of claim 1, wherein:
a parameter of the scheduling information for the first PDSCH reception comprises one of: a frequency domain resource allocation, a time domain resource allocation, or a modulation and coding scheme; and
the first DCI format provides a value of the parameter according to one of:
(i) wherein the value is same for the first PDSCH reception and the second PDSCH reception,
(ii) wherein the value is for the second PDSCH reception and another value is derived from the value for the first PDSCH reception, or
(iii) wherein a first value is for the first PDSCH reception and a second value is for the second PDSCH reception.

### Claim 3 (depends on 1)

The UE of claim 1, wherein:
a search space set provides parameters for a physical downlink control channel (PDCCH) reception that includes a DCI format;
a parameter of the configuration information for the second search space set comprises one of a periodicity in a number of slots, a duration in a number of slots, a starting slot, or a first symbol; and
a value of the parameter is one of:
same as a corresponding parameter for a third search space set,
determined from a value of the parameter for a third search space set, or predetermined.

### Claim 4 (depends on 1)

The UE of claim 1, wherein:
the SS/PBCH block includes first configuration information for a first control resource set (CORESET),
the processor is further configured to determine, for a second CORESET, second configuration information that includes one or more parameters of an identity, antenna port quasi co-location (QCL) information of a demodulation-reference signal (DM-RS) antenna port associated with a PDCCH reception in the second CORESET, a bandwidth in a number of resource blocks (RB), an RB offset between a lowest RB index of the second CORESET and a lowest RB index of the SS/PBCH block, or a number of symbols; and
the bandwidth of the second CORESET is within a bandwidth of the first CORESET, and the second search space set is associated with the second CORESET.

### Claim 5 (depends on 4)

The UE of claim 4, wherein the processor is further configured to determine a value of a parameter for the second CORESET, the value being one of:
a same value as a value of the parameter for the first CORESET,
determined based on an indication in the SS/PBCH block, or
a predetermined value.

### Claim 6 (depends on 1)

The UE of claim 1, wherein the second search space set is used for receiving PDCCHs according to a common search space, and the second DCI format includes cyclic redundancy check (CRC) bits that are scrambled by bits for one of: a system information-radio network temporary identifier (SI-RNTI), a paging-RNTI (P-RNTI), or a random access-RNTI (RA-RNTI).

### Claim 7 (depends on 5)

The UE of claim 5, wherein the processor is further configured to:
determine a UE identity; and
determine the second CORESET based on one of:
the UE identity,
a bandwidth that is within a bandwidth for the first CORESET, or
an indication in the SS/PBCH block.

### Claim 8

A base station (BS) comprising:
a processor configured to:
include configuration information for one or two search space sets in a synchronization signal/physical broadcast channel (SS/PBCH) block, and
include scheduling information for a transmission of a first physical downlink shared channel (PDSCH) based on:
when the configuration information is for the one search space set, a first downlink control information (DCI) format associated with a first search space set from the one or two search space sets, wherein the first DCI format includes the scheduling information for the first PDSCH transmission and for a second PDSCH transmission, and
when the configuration information is for the two search space sets, a second DCI format associated with a second search space set from the one or two search space sets, wherein the second DCI format includes the scheduling information for the first PDSCH transmission; and
a transceiver operably coupled to the processor, the transceiver configured to:
transmit the SS/PBCH block, and
transmit the first PDSCH based on the scheduling information.

### Claim 9 (depends on 8)

The BS of claim 8, wherein:
a parameter of the scheduling information for the first PDSCH transmission comprises one of: a frequency domain resource allocation, a time domain resource allocation, or a modulation and coding scheme; and
the first DCI format provides a value of the parameter according to one of:
(i) wherein the value is same for the first PDSCH transmission and the second PDSCH transmission,
(ii) wherein the value is for the second PDSCH transmission and another value is derived from the value for the first PDSCH transmission, or
(iii) wherein a first value is for the first PDSCH transmission and a second value is for the second PDSCH transmission.

### Claim 10 (depends on 8)

The BS of claim 8, wherein:
a search space set provides parameters for a physical downlink control channel (PDCCH) transmission that includes a DCI format;
a parameter of the configuration information for the second search space set comprises one of a periodicity in a number of slots, a duration in a number of slots, a starting slot, or a first symbol; and
a value of the parameter is one of:
same as a corresponding parameter for a third search space set,
determined from a value of the parameter for a third search space set, or predetermined.

### Claim 11 (depends on 8)

The BS of claim 8, wherein:
the SS/PBCH block includes first configuration information for a first control resource set (CORESET);
the processor is further configured to, for a second CORESET, second configuration information that includes one or more parameters of an identity, antenna port quasi co-location (QCL) information of a demodulation-reference signal (DM-RS) antenna port associated with a PDCCH transmission in the second CORESET, a bandwidth in a number of resource blocks (RB), an RB offset between a lowest RB index of the second CORESET and a lowest RB index of the SS/PBCH block, or a number of symbols; and
the bandwidth of the second CORESET is within a bandwidth of the first CORESET, and the second search space set is associated with the second CORESET.

### Claim 12 (depends on 11)

The BS of claim 11, wherein the processor is further configured to provide a value of a parameter for the second CORESET, the value being one of:
a same value as a value of the parameter for the first CORESET,
determined based on an indication in the SS/PBCH block, or
a predetermined value.

### Claim 13 (depends on 8)

The BS of claim 8, wherein the second search space set is used for transmitting PDCCHs according to a common search space, and the second DCI format includes cyclic redundancy check (CRC) bits that are scrambled by bits for one of: a system information-radio network temporary identifier (SI-RNTI), a paging-RNTI (P-RNTI), or a random access-RNTI (RA-RNTI).

### Claim 14 (depends on 12)

The BS of claim 12, wherein the processor is further configured to:
identify a UE identity; and
provide the second CORESET based on one of:
the UE identity,
a bandwidth that is within a bandwidth for the first CORESET, or
an indication in the SS/PBCH block.

### Claim 15

A method of a user equipment (UE), the method comprising:
receiving a synchronization signal/physical broadcast channel (SS/PBCH) block that includes configuration information for one or two search space sets;
determining scheduling information for a reception of a first physical downlink shared channel (PDSCH) based on:
when the configuration information is for the one search space set, a first downlink control information (DCI) format associated with a first search space set from the one or two search space sets, wherein the first DCI format includes the scheduling information for the first PDSCH reception and for a second PDSCH reception, and
when the configuration information is for the two search space sets, a second DCI format associated with a second search space set from the one or two search space sets, wherein the second DCI format includes the scheduling information for the first PDSCH reception; and
receiving the first PDSCH based on the scheduling information.

### Claim 16 (depends on 15)

The method of claim 15, wherein:
a parameter of the scheduling information for the first PDSCH reception comprises one of a frequency domain resource allocation, a time domain resource allocation, or a modulation and coding scheme; and
the first DCI format provides a value of the parameter according to one of:
(i) wherein the value is same for the first PDSCH reception and the second PDSCH reception,
(ii) wherein the value is for the second PDSCH reception and another value is derived from the value for the first PDSCH reception, or
(iii) wherein a first value is for the first PDSCH reception and a second value is for the second PDSCH reception.

### Claim 17 (depends on 15)

The method of claim 15, wherein:
a search space set provides parameters for a physical downlink control channel (PDCCH) reception that includes a DCI format;
a parameter of the configuration information for the second search space set comprises one of a periodicity in a number of slots, a duration in a number of slots, a starting slot, or a first symbol; and
a value of the parameter is one of:
same as a corresponding parameter for a third search space set,
determined from a value of the parameter for a third search space set, or predetermined.

### Claim 18 (depends on 15)

The method of claim 15, further comprising determining, for a second control resource set (CORESET), second configuration information that includes one or more parameters of an identity, antenna port quasi co-location (QCL) information of a demodulation-reference signal (DM-RS) antenna port associated with a PDCCH in the second CORESET, a bandwidth in a number of resource blocks (RB), an RB offset between a lowest RB index of the second CORESET and a lowest RB index of the SS/PBCH block, or a number of symbols,
wherein:
the SS/PBCH block includes first configuration information for a first CORESET;
the bandwidth of the second CORESET is within a bandwidth of the first CORESET; and
the second search space set is associated with the second CORESET.

### Claim 19 (depends on 18)

The method of claim 18, further comprising determining a value of a parameter for the second CORESET, the value being one of:
a same value as a value of the parameter for the first CORESET,
determined based on an indication in the SS/PBCH block, or
a predetermined value.

### Claim 20 (depends on 19)

The method of claim 19, further comprising:
determining a UE identity; and
determining the second CORESET based on one of the UE identity, a bandwidth that is within a bandwidth for the first CORESET, or an indication in the SS/PBCH block,
wherein the second search space set is used for receiving PDCCHs according to a common search space, and the second DCI format includes cyclic redundancy check (CRC) bits that are scrambled by bits for one of: a system information-radio network temporary identifier (SI-RNTI), a paging-RNTI (P-RNTI), or a random access-RNTI (RA-RNTI).