# US 2018/0324773 A1 · Method and apparatus for receiving downlink control channel in wireless communication system

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- Number: US 2018/0324773 A1
- Document ID: US20180324773A1
- Status: Published application
- Kind: A1
- Application number: 15/972,667
- Filed: 2018-05-07
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Jingxing FU; Bin YU; Chen QIAN; Qi XIONG
- Web page: https://patentgrep.com/patent/US20180324773A1

## CPC

- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/0082: {at predetermined intervals}
- H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 72/044: based on the type of the allocated resource
- 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

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A technique for receiving a downlink control channel is provided that includes operations of determining whether a physical downlink shared channel (PDSCH) is received at a time-domain position n; determining, according to a result of the determining, a frequency-domain position of a bandwidth part (BWP) for receiving a physical downlink control channel (PDCCH) at a time-domain position n+1, and receiving the PDCCH at the BWP of the frequency-domain position. The technique determines the frequency-domain position of the BWP for receiving the PDCCH by determining whether it is necessary to receive the PDSCH at the time-domain position preceding the current time-domain position for receiving the PDCCH, greatly reducing or even eliminating the influence of the adjustment time interval for the user equipment (UE) to convert the BWP on the normal data reception of the UE, which ensures the receiving performance and the throughput level of the received data of the UE.

## Claims

### Claim 1

A method for operating a user equipment (UE) in a wireless communication system, of the method comprising:
determining whether a physical downlink shared channel (PDSCH) is received at a first time-domain position;
determining a frequency-domain position of a bandwidth part (BWP) for receiving a physical downlink control channel (PDCCH) at a second time-domain position according to a result of the determining of whether the PDSCH is received at the first time-domain position; and
receiving the PDCCH at the BWP of the frequency-domain position.

### Claim 2 (depends on 1)

The method of claim 1, wherein the determining of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position comprises:
determining the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position to be the same as a frequency-domain position of a BWP where the PDSCH is received at the first time-domain position, if the result of the determining of whether the PDSCH is received at the first time-domain position is positive.

### Claim 3 (depends on 1)

The method of claim 1, wherein, the determining of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position comprises:
determining the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to whether a PDSCH has been received at a third time-domain position preceding the first time-domain position, if the result of the determining of whether the PDSCH is received at the first time-domain position is negative.

### Claim 4 (depends on 3)

The method of claim 3,
wherein the determining of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to whether the PDSCH has been received at the third time-domain position preceding the first time-domain position comprises:
determining the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position to be the same as a frequency-domain position of a BWP where the PDSCH has been received at the third time-domain position, if the PDSCH has been received at the third time-domain position, and
wherein the third time-domain position is a time-domain position that is closest to the first time-domain position among time-domain positions at which a PDSCH has been received.

### Claim 5 (depends on 3)

The method of claim 3, wherein the determining of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to whether the PDSCH has been received at the third time-domain position preceding the first time-domain position, comprises:
determining the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position by a signaling received from a base station, if no PDSCH has been received at third the time-domain position.

### Claim 6 (depends on 1)

The method of claim 1, wherein, before the determining of whether it is necessary to receive the PDSCH at the first time-domain position the method further comprises:
receiving a PDCCH at time-frequency positions configured by a higher-layer signaling, wherein the time-frequency positions configured by the higher-layer signaling have a same frequency-domain value; and
determining whether the PDSCH is received at the first time-domain position, wherein, if a time-domain index of the time-frequency positions configured by the higher-layer signaling is different from a time-domain index of the second time-domain position.

### Claim 7 (depends on 1)

The method of claim 1, wherein the determining of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to the result of the determining of whether the PDSCH is received at the first time-domain position comprises:
determining the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position by a signaling received from a base station, if the result of the determining of whether the PDSCH is received at the first time-domain position is positive.

### Claim 8 (depends on 7)

The method of claim 7, wherein the determining of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to the result of the determining of whether the PDSCH is received at the first time-domain position, and receiving the PDCCH at the BWP of the frequency-domain position, comprise:
determining, according to the result of the determining of whether the PDSCH is received at the first time-domain position, the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position; and
receiving the PDCCH at a time-frequency resource determined by the frequency-domain position and a posterior part of the second time-domain position.

### Claim 9 (depends on 7)

The method of claim 7, wherein, after the determining of whether the PDSCH is received at the first time-domain position, the method further comprises:
receiving the PDSCH at the front part of the first time-domain position if it is necessary to receive the PDSCH at the first time-domain position.

### Claim 10 (depends on 9)

The method of claim 9,
wherein the receiving of the PDSCH at the front part of the first time-domain position comprises:
receiving the PDSCH within a first a (a is a positive integer) orthogonal frequency division multiplexing (OFDM) symbols at the first time-domain position, and
wherein, the a OFDM symbols are predetermined by an agreed rule or indicated by a higher-layer signaling.

### Claim 11 (depends on 9)

The method of claim 9, wherein the determining of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to the result of the determining of whether the PDSCH is received at the first time-domain position, and receiving the PDCCH at the BWP of the frequency-domain position, comprise:
determining, according to the result of the determining of whether the PDSCH is received at the first time-domain position, the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position; and
receiving the PDCCH at a time-frequency resource determined by the frequency-domain position and a posterior part of the second time-domain position.

### Claim 12 (depends on 11)

The method of claim 11, wherein, the determining, according to the result of the determining of whether the PDSCH is received at the first time-domain position, of the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position, and receiving the PDCCH at the time-frequency resource determined by the frequency-domain position and the posterior part of the second time-domain position, comprise:
determining the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to the result of the determining of whether the PDSCH is received at the first time-domain position; and
receiving the PDCCH at the time-frequency resource determined by the frequency-domain position and the last b (b is a positive integer) OFDM symbols of the second time-domain position,
wherein the b OFDM symbols are predetermined by an agreed rule or indicated by the higher-layer signaling.

### Claim 13

A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
at least one processor coupled to the transceiver and configured to:
determine whether it is necessary to receive a physical downlink shared channel (PDSCH) at a first time-domain position; and
determine, according to a decision of the at least one processor, a frequency-domain position of a bandwidth part (BWP) for receiving a physical downlink control channel (PDCCH) at a second time-domain position, and
receive the PDCCH at the BWP of the frequency-domain position.

### Claim 14 (depends on 13)

The UE of claim 13, wherein the at least one processor is further configured to determine the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position to be the same as a frequency-domain position of a BWP where the PDSCH is received at the first time-domain position, if the result of the determining of whether the PDSCH is received at the first time-domain position is positive.

### Claim 15 (depends on 13)

The UE of claim 13, wherein the at least one processor is further configured to determine the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position according to whether a PDSCH has been received at a third time-domain position preceding the first time-domain position, if the result of the determining of whether the PDSCH is received at the first time-domain position is negative.

### Claim 16 (depends on 15)

The UE of claim 15, the at least one processor is further configured to determine the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position to be the same as a frequency-domain position of a BWP where the PDSCH has been received at the third time-domain position, if the PDSCH has been received at the third time-domain position,
wherein the third time-domain position is a time-domain position that is closest to the first time-domain position among time-domain positions at which a PDSCH has been received.

### Claim 17 (depends on 15)

The UE of claim 15, the at least one processor is further configured to determine the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position by a signaling received from a base station, if no PDSCH has been received at third the time-domain position.

### Claim 18 (depends on 13)

The UE of claim 13, the at least one processor is further configured to:
receive a PDCCH at time-frequency positions configured by a higher-layer signaling, wherein the time-frequency positions configured by the higher-layer signaling have a same frequency-domain value, and
determine whether the PDSCH is received at the first time-domain position, wherein, if a time-domain index of the time-frequency positions configured by the higher-layer signaling is different from a time-domain index of the second time-domain position.

### Claim 19 (depends on 13)

The UE of claim 13, wherein the at least one processor is further configured to determine the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position by a signaling received from a base station, if the result of the determining of whether the PDSCH is received at the first time-domain position is positive.

### Claim 20 (depends on 19)

The UE of claim 19, wherein the at least one processor is further configured to:
determine, according to the result of the determining of whether the PDSCH is received at the first time-domain position, the frequency-domain position of the BWP for receiving the PDCCH at the second time-domain position; and
receive the PDCCH at a time-frequency resource determined by the frequency-domain position and a posterior part of the second time-domain position.