IP Library › Granted Patent US 10,405,266

Granted Patent B2

US 10,405,266 · App. 15/470,641 · Granted Sep 3, 2019

Method and user equipment for receiving downlink control channel, and method and base station for transmitting downlink control channel

Inventors: Hyangsun You (Seoul, KR); Yunjung Yi (Seoul, KR)

Assignee: LG ELECTRONICS INC.

H04W48/12 H04L5/0007 H04L5/0044 H04W88/08 H04W72/042

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Quick Facts

Patent No.: US 10,405,266
App. No.: 15/470,641
Granted: Sep 3, 2019
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

Information indicating one of possible PDSCH start subframes may be provided to the UE via the PDCCH. The PDSCH corresponding to the PDCCH may be transmitted/received starting from the indicated subframe. The possible PDSCH start subframes may be determined based on the ratio of the maximum number of PDCCH repetitions in the PDCCH search space and may be determined based on the ratio of the number of times related to the PDSCH repetition after the PDCCH search space.

Claims (529)

1. A method of receiving a downlink channel by a user equipment, the method comprising:

receiving a physical downlink control channel (PDCCH) carrying downlink control information (DCI) in a PDCCH search space R times, wherein R is a positive integer; and

receiving a physical downlink shared channel (PDSCH) starting from subframe l after subframe n, in which the PDCCH is received last, based on the DCI,

wherein the DCI includes information indicating the subframe l among possible PDSCH start positions,

wherein the possible PDSCH start positions are determined based on a ratio of a maximum number of PDCCH repetitions R max in the PDCCH search space and are determined based on a ratio of the number of times D related to repetition of the PDSCH after the PDCCH search space,

wherein the information indicating the subframe l in the DCI indicates the number m of subframes from the subframe n to the subframe l,

wherein the subframe n is subframe k 0 +k, the subframe k 0 +k being a k-th subframe from start subframe k 0 of the PDCCH search space,

wherein k is a multiple of (R max /8), and

wherein m is given by the following table:

DCI field value for PDSCH start subframe

R max /8

4 + R max /8

4 + (R max /8) * 2

4 + (R max /8) * 3

(R max /

4 + R max /8

4 + (R max /8) * 2

4 + (R max /8) * 3

8) * 2

(R max /

4 + R max /8

4 + (R max /8) * 2

4 + (R max /8) * 3

8) * 3

(R max /

4 + R max /8

4 + (R max /8) * 2

4 + (R max /8) * 3

8) * 4

(R max /

4 + R max /8

4 + (R max /8) * 2

4 + (R max /8) * 3

8) * 5

(R max /

4 + R max /8

4 + (R max /8) * 2

4 + (R max /8) * 2 + D

8) * 6

(R max /

4 + R max /8

4 + (R max /8) + D

4 + (R max /8) + D * 2

8) * 7

(R max /

4 + D

4 + D * 2

4 + D * 3

8) * 8

DCI field value for PDSCH start subframe

R max /8

4 + (R max /8) * 4

4 + (R max /8) *

4 + (R max /8) 6

4 + (R max /8) *

(R max /

4 + (R max /8) * 4

4 + (R max /8) *

8) * 2

6 + D

(R max /

4 + (R max /8) * 4

4 + (R max /8) *

8) * 3

5 + D

5 + D * 2

(R max /

4 + (R max /8) * 4

4 + (R max /8) *

8) * 4

4 + D

4 + D * 2

4 + D * 3

(R max /

4 + (R max /

4 + (R max /8) *

8) * 5

8) * 3 + D

3 + D * 2

3 + D * 3

3 + D * 4

(R max /

4 + (R max /

4 + (R max /8) *

8) * 6

8) * 2 + D * 2

2 + D * 3

2 + D * 4

2 + D * 5

(R max /

4 + (R max /

4 + (R max /8) +

4 + R max /8 +

8) * 7

8) + D * 3

D * 4

D * 5

D * 6

(R max /

4 + D * 4

4 + D * 5

4 + D * 6

4 + D * 7.

8) * 8

2. The method of claim 1 , wherein D is the number of repetitions of the PDSCH, a minimum repetition number (=D min ) of the PDSCH which is configurable by the DCI, a maximum repetition number of the PDSCH which is configurable by the DCI, D min *N, or D max /N,

wherein N is a positive integer.

3. A user equipment for receiving a downlink channel, comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to:

control the RF unit to receive a physical downlink control channel (PDCCH) carrying downlink control information (DCI) in a PDCCH search space R times, wherein R is a positive integer; and

control the RF unit to receive a physical downlink shared channel (PDSCH) starting from subframe l after subframe n, in which the PDCCH is received last, based on the DCI,

wherein the DCI includes information indicating the subframe l among possible PDSCH start positions,

wherein the information indicating the subframe l in the DCI indicates the number m of subframes from the subframe n to the subframe l,

wherein the subframe n is subframe k 0 +k, the subframe k 0 +k being a k-th subframe from start subframe k 0 of the PDCCH search space,

wherein k is a multiple of (R max /8), and

wherein m is given by the following table:

DCI field value for PDSCH start subframe

R max /8

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 6

4 + (R max /8) * 7

R max /8

8) * 2

(R max /8) * 2

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 6

4 + (R max /8) * 6 +

R max /8

8) * 2

(R max /8) * 3

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 5 +

R max /8

8) * 2

D * 2

(R max /8) * 4

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 4 +

R max /8

8) * 2

D * 2

D * 3

(R max /8) * 5

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 3 +

R max /8

8) * 2

D * 2

D * 3

D * 4

(R max /8) * 6

4 +

4 + (R max /

4 + (R max /8) * 2 +

R max /8

8) * 2

8) * 2 + D

D * 2

D * 3

D * 4

D * 5

(R max /8) * 7

4 +

4 + (R max /

4 + (R max /8) +

4 + R max /8 +

R max /8

8) + D

8) + D * 2

D * 3

D * 4

D * 5

D * 6

(R max /8) * 8

4 + D

4 + D * 2

4 + D * 3

4 + D * 4

4 + D * 5

4 + D * 6

4 + D * 7.

4. The user equipment according to claim 3 ,

wherein D is the number of repetitions of the PDSCH, a minimum repetition number (=D min ) of the PDSCH which is configurable by the DCI, a maximum repetition number of the PDSCH which is configurable by the DCI, D min *N, or D max /N,

wherein N is a positive integer.

5. A method of transmitting a downlink channel by a base station, the method comprising:

transmitting a physical downlink control channel (PDCCH) carrying downlink control information (DCI) in a PDCCH search space R times, wherein R is a positive integer; and

transmitting a physical downlink shared channel (PDSCH) starting from subframe l after subframe n, in which the PDCCH is transmitted last, based on the DCI,

wherein the DCI includes information indicating the subframe l among possible PDSCH start positions,

wherein the information indicating the subframe l in the DCI indicates the number m of subframes from the subframe n to the subframe l,

wherein the subframe n is subframe k 0 +k, the subframe k 0 +k being a k-th subframe from start subframe k 0 of the PDCCH search space,

wherein k is a multiple of (R max /8), and

wherein m is given by the following table:

DCI field value for PDSCH start subframe

R max /8

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 6

4 + (R max /8) * 7

R max /8

8) * 2

(R max /8) * 2

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 6

4 + (R max /8) * 6 +

R max /8

8) * 2

(R max /8) * 3

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 5 +

R max /8

8) * 2

D * 2

(R max /8) * 4

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 4 +

R max /8

8) * 2

D * 2

D * 3

(R max /8) * 5

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 3 +

R max /8

8) * 2

D * 2

D * 3

D * 4

(R max /8) * 6

4 +

4 + (R max /

4 + (R max /8) * 2 +

R max /8

8) * 2

8) * 2 + D

D * 2

D * 3

D * 4

D * 5

(R max /8) * 7

4 +

4 + (R max /

4 + (R max /8) +

4 + R max /8 +

R max /8

8) + D

8) + D * 2

D * 3

D * 4

D * 5

D * 6

(R max /8) * 8

4 + D

4 + D * 2

4 + D * 3

4 + D * 4

4 + D * 5

4 + D * 6

4 + D * 7.

6. A base station for transmitting a downlink channel, comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to

control the RF unit to transmit a physical downlink control channel (PDCCH) carrying downlink control information (DCI) in a PDCCH search space R times, wherein R is a positive integer; and

control the RF unit to transmit a physical downlink shared channel (PDSCH) starting from subframe l after subframe n, in which the PDCCH is transmitted last, based on the DCI,

wherein the DCI includes information indicating the subframe l among possible PDSCH start positions,

wherein the information indicating the subframe l in the DCI indicates the number m of subframes from the subframe n to the subframe l,

wherein the subframe n is subframe k 0 +k, the subframe k 0 +k being a k-th subframe from start subframe k 0 of the PDCCH search space,

wherein k is a multiple of (R max /8), and

wherein m is given by the following table:

DCI field value for PDSCH start subframe

R max /8

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 6

4 + (R max /8) * 7

R max /8

8) * 2

(R max /8) * 2

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 6

4 + (R max /8) * 6 +

R max /8

8) * 2

(R max /8) * 3

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 5

4 + (R max /8) * 5 +

R max /8

8) * 2

D * 2

(R max /8) * 4

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 4

4 + (R max /8) * 4 +

R max /8

8) * 2

D * 2

D * 3

(R max /8) * 5

4 +

4 + (R max /

4 + (R max /8) * 3

4 + (R max /8) * 3 +

R max /8

8) * 2

D * 2

D * 3

D * 4

(R max /8) * 6

4 +

4 + (R max /

4 + (R max /8) * 2 +

R max /8

8) * 2

8) * 2 + D

D * 2

D * 3

D * 4

D * 5

(R max /8) * 7

4 +

4 + (R max /

4 + (R max /8) +

4 + R max /8 +

R max /8

8) + D

8) + D * 2

D * 3

D * 4

D * 5

D * 6

(R max /8) * 8

4 + D

4 + D * 2

4 + D * 3

4 + D * 4

4 + D * 5

4 + D * 6

4 + D * 7.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 27, 2017

From: YOU, HYANGSUN; YI, YUNJUNG

To: LG ELECTRONICS INC.

Reel/Frame 041756/0782 →

Continuity (2)

Provisional Application 62317649 · Apr 4, 2016

Related Publication 20170289899A1 · Oct 5, 2017