# US 12,016,020 B2 · Radio communication system and communication control method

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- Number: US 12,016,020 B2
- Document ID: US12016020B2
- Status: Granted
- Kind: B2
- Application number: 18/508,558
- Filed: 2023-11-14
- Published: 2024-03-07
- Granted: 2024-06-18
- Earliest claimed: 2017-03-15
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Le Liu; Yoshikazu Kakura; Naoto Ishii; Takamichi Inoue
- Web page: https://patentgrep.com/patent/US12016020B2

## CPC

- H04W 72/1273: of downlink data flows
- H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
- H04J 11/0053: {using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022)}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 48/12: using downlink control channel
- H04W 72/12: Wireless traffic scheduling
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- 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)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

## Claims

### Claim 1

A method for a base station, the method comprising:
communicating with a user equipment; and
transmitting an enhanced physical downlink control channel (EPDCCH) configuration to the user equipment,
wherein the EPDCCH configuration comprises a parameter, and
wherein an initialization value for scrambling a bit of an EPDCCH is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
⁢
2
9
+
N
1
,
where the Cinit,1 is the initialization value, the ns is a slot number within a radio frame and the N1 is the parameter.

### Claim 2 (depends on 1)

The method according to claim 1,
wherein the EPDCCH configuration is transmitted by Radio Resource Control (RRC) signaling.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
scrambling the bit of the EPDCCH based on the initialization value; and
transmitting, in the EPDCCH to the user equipment, a scrambled bit of the EPDCCH which is scrambled based on the initialization value.

### Claim 4 (depends on 1)

The method according to claim 1,
wherein the initialization value for scrambling the bit of the EPDCCH is a first initialization value,
wherein the formula is a first formula,
wherein the first formula is different from a second formula of a second initialization value,
wherein the second initialization value is for scrambling a bit of a physical downlink control channel (PDCCH), and
wherein the second formula of the second initialization value is defined as follows:
C
init
,
2
=
⌊
n
s
2
⌋
⁢
2
9
+
N
2
,
where the Cinit,2 is the second initialization value, the ns is the slot number within the radio frame, and the N2 is a cell identity (ID).

### Claim 5

A method for a user equipment, the method comprising:
communicating with a base station; and
receiving an enhanced physical downlink control channel (EPDCCH) configuration from the base station,
wherein the EPDCCH configuration comprises a parameter, and
wherein an initialization value for scrambling a bit of an EPDCCH is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
⁢
2
9
+
N
1
,
where the Cinit,1 is the initialization value, the ns is a slot number within a radio frame and the N1 is the parameter.

### Claim 6 (depends on 5)

The method according to claim 5,
wherein the EPDCCH configuration is received by Radio Resource Control (RRC) signaling.

### Claim 7 (depends on 5)

The method according to claim 5, further comprising:
receiving, in the EPDCCH from the base station, a scrambled bit of the EPDCCH which is scrambled based on the initialization value.

### Claim 8 (depends on 5)

The method according to claim 5,
wherein the initialization value for scrambling the bit of the EPDCCH is a first initialization value,
wherein the formula is a first formula,
wherein the first formula is different from a second formula of a second initialization value,
wherein the second initialization value is for scrambling a bit of a physical downlink control channel (PDCCH), and
wherein the second formula of the second initialization value is defined as follows:
C
init
,
2
=
⌊
n
s
2
⌋
⁢
2
9
+
N
2
,
where the Cinit,2 is the second initialization value, the ns is the slot number within the radio frame, and the N2 is a cell identity (ID).

### Claim 9

A base station comprising:
at least one memory; and
at least one hardware processor coupled to the at least one memory,
wherein the at least one hardware processor is configured to:
communicate with a user equipment; and
transmit an enhanced physical downlink control channel (EPDCCH) configuration to the user equipment,
wherein the EPDCCH configuration comprises a parameter, and
wherein an initialization value for scrambling a bit of an EPDCCH is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
⁢
2
9
+
N
1
,
where the Cinit,1 is the initialization value, the ns is a slot number within a radio frame and the N1 is the parameter.

### Claim 10

A user equipment comprising:
at least one memory; and
at least one hardware processor coupled to the at least one memory,
wherein the at least one hardware processor is configured to:
communicate with a base station; and
receive an enhanced physical downlink control channel (EPDCCH) configuration from the base station,
wherein the EPDCCH configuration comprises a parameter, and
wherein an initialization value for scrambling a bit of an EPDCCH is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
⁢
2
9
+
N
1
,
where the Cinit,1 is the initialization value, the ns is a slot number within a radio frame and the N1 is the parameter.