# US 2015/0146512 A1 · Apparatus and method for transmitting and receiving of cyclic shift parameter for supporting orthogonality in mimo environment

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- Number: US 2015/0146512 A1
- Document ID: US20150146512A1
- Status: Published application
- Kind: A1
- Application number: 14/611,852
- Filed: 2015-02-02
- Published: 2015-05-28
- Earliest claimed: 2010-05-03
- Assignees: Pantech Co., Ltd.
- Applicants: Pantech Co., Ltd.
- Inventors: Sungjun YOON; Kyoung-min Park
- Web page: https://patentgrep.com/patent/US20150146512A1

## CPC

- H04L 27/2613: {Structure of the reference signals}
- H04B 7/0413: MIMO systems
- H04B 7/0452: Multi-user MIMO systems
- H04J 13/0062: {Zadoff-Chu}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 27/2607: {Cyclic extensions}
- H04W 88/02: Terminal devices
- H04W 88/08: Access point devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method includes: determining a Cyclic Shift (CS) parameter that implicitly indicates an orthogonality allocation rule and orthogonality-related information, by determining a multiple access state of a User Equipment (UE), and transmitting the determined CS parameter to the UE, wherein the orthogonality-related information includes an Orthogonal Cover Code indicated by the CS parameter, the orthogonality allocation rule is determined as a uniform scheme or a non-uniform scheme according to the CS parameter, determining the CS parameter by which the non-uniform scheme is applied if the UE is in a Single User Multiple Input Multiple Output state, and determining the CS parameter by which the uniform scheme is applied if the UE is in a Multiple User Multiple Input Multiple Output state.

## Claims

### Claim 1

A method of generating reference signals for multiple layers by a User Equipment (UE), the method comprising:
receiving a Cyclic Shift (CS) parameter from an evolved NodeB (eNodeB), the CS parameter comprising a 3-bit value;
generating the reference signals for N layers based on the 3-bit value; and
transmitting the generated reference signals to the eNodeB,
wherein N is 2 or 4, and
wherein the generating of the reference signals for the N layers comprises:
applying a first Orthogonal Cover Code (OCC) for each of the N layers in response to a determination that the CS parameter is one of 011 indicating 4 as a CS parameter value of a first layer of the N layers and 100 indicating 2 as the CS parameter value of the first layer; and
applying a second OCC for each of the N layers in response to a determination that the CS parameter is one of 101 indicating 8 as the CS parameter value of the first layer and 110 indicating 10 as the CS parameter value of the first layer.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first OCC is [+1, +1] and the second OCC is [+1, −1].

### Claim 3 (depends on 1)

The method of claim 1, wherein the generating of the reference signals for the N layers further comprises:
in response to a determination that the CS parameter is 000 indicating 0 as the CS parameter value of the first layer, applying the first OCC for the first layer and a second layer of the N layers and applying the second OCC different from the first OCC for a third layer of the N layers and a fourth layer of the N layers.

### Claim 4 (depends on 1)

The method of claim 1, wherein, if the CS parameter is one of 000, 001, 010, and 111, CS parameter values for the N layers are selected from among 0, 3, 6, and 9.

### Claim 5 (depends on 1)

The method of claim 1, wherein, if the CS parameter is one of 011 and 110, CS parameter values for the N layers are selected from among 1, 4, 7, and 10, and
wherein, if the CS parameter is one of 100 and 101, CS parameter values for the N layers are selected from among 2, 5, 8, and 11.

### Claim 6 (depends on 1)

The method of claim 1, wherein CS parameter values of the N layers are determined based on the 3-bit value as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
λ = 1
λ = 2
λ = 3
000
0
6
3
9
001
6
0
9
3
010
3
9
6
0
011
4
10
7
1
100
2
8
5
11
101
8
2
11
5
110
10
4
1
7
111
9
3
0
6
wherein the first layer is the layer λ=0.

### Claim 7 (depends on 3)

The method of claim 3, wherein CS parameter values of the N layers are determined based on the 3-bit value as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
λ = 1
λ = 2
λ = 3
000
0
6
3
9
001
6
0
9
3
010
3
9
6
0
011
4
10
7
1
100
2
8
5
11
101
8
2
11
5
110
10
4
1
7
111
9
3
0
6
wherein the first layer is the layer λ=0, the second layer is the layer λ=1, the third layer is the layer λ=2, and the fourth layer is the layer λ=3.

### Claim 8 (depends on 1)

The method of claim 1, wherein the CS parameter indicates CS parameter values of the N layers as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9
wherein the first layer is the layer 0 (layer λ=0), and
wherein CS parameter value of layer 1 (layer λ=1)=([CS parameter value of layer 0]+6)mod 12,
CS parameter value of layer 2 (layer λ=2)=([CS parameter value of layer 0]+3)mod 12, and
CS parameter value of layer 3 (layer λ=3)=([CS parameter value of layer 0]+9)mod 12.

### Claim 9

A method of transmitting a Cyclic Shift (CS) parameter from an evolved NodeB (eNodeB) to a User Equipment (UE) that generates reference signals for multiple layers, the method comprising:
setting 011 or 100 as the CS parameter, the 011 CS parameter or the 100 CS parameter indicating a first Orthogonal Cover Code (OCC) for each of N layers of the UE, or
setting 101 or 110 as the CS parameter, the 101 CS parameter or the 110 CS parameter indicating a second OCC for each of the N layers of the UE; and
transmitting the CS parameter to the UE,
wherein the 011 CS parameter indicates 4 as a CS parameter value of a first layer of the N layers, the 100 CS parameter indicates 2 as the CS parameter value of the first layer, the 101 CS parameter indicates 8 as the CS parameter value of the first layer, and the 110 CS parameter indicates 10 as the CS parameter value of the first layer, and
wherein the CS parameter is a 3-bit value, and N is 2 or 4.

### Claim 10 (depends on 9)

The method of claim 9 wherein the first OCC is [+1, +1] and the second OCC is [+1, −1].

### Claim 11 (depends on 9)

The method of claim 9, further comprising:
receiving reference signals from the UE, the reference signals being generated by applying OCCs determined based on the CS parameter,
wherein, if 000 is set as the CS parameter, the 000 CS parameter indicates the first OCC for the first layer and a second layer of the N layers and indicates the second OCC different from the first OCC for a third layer of the N layers and a fourth layer of the N layers, and
wherein the 000 CS parameter indicates 0 as the CS parameter value of the first layer.

### Claim 12 (depends on 9)

The method of claim 9, wherein, if the CS parameter is one of 000, 001, 010, and 111, CS parameter values for the N layers are selected from among 0, 3, 6, and 9.

### Claim 13 (depends on 9)

The method of claim 9, wherein, if the CS parameter is one of 011 and 110, CS parameter values for the N layers are selected from among 1, 4, 7, and 10, and
wherein, if the CS parameter is one of 100 and 101, CS parameter values for the N layers are selected from among 2, 5, 8, and 11.

### Claim 14 (depends on 9)

The method of claim 9, wherein the CS parameter indicates CS parameter values of the N layers as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
λ = 1
λ = 2
λ = 3
000
0
6
3
9
001
6
0
9
3
010
3
9
6
0
011
4
10
7
1
100
2
8
5
11
101
8
2
11
5
110
10
4
1
7
111
9
3
0
6
wherein the first layer is the layer λ=0.

### Claim 15 (depends on 11)

The method of claim 11, wherein the CS parameter indicates CS parameter values of the N layers as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
λ = 1
λ = 2
λ = 3
000
0
6
3
9
001
6
0
9
3
010
3
9
6
0
011
4
10
7
1
100
2
8
5
11
101
8
2
11
5
110
10
4
1
7
111
9
3
0
6
wherein the first layer is the layer λ=0, the second layer is the layer λ=1, the third layer is the layer λ=2, and the fourth layer is the layer λ=3.

### Claim 16 (depends on 9)

The method of claim 9, wherein the CS parameter indicates CS parameter values of the N layers as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
000
0
001
6
010
3
011
4
100
2
101
8
110
10
111
9
wherein the first layer is the layer 0 (layer λ=0), and
wherein CS parameter value of layer 1 (layer λ=1)=([CS parameter value of layer 0]+6)mod 12,
CS parameter value of layer 2 (layer λ=2)=([CS parameter value of layer 0]+3)mod 12, and
CS parameter value of layer 3 (layer λ=3)=([CS parameter value of layer 0]+9)mod 12.

### Claim 17

A User Equipment (UE) to generate reference signals for multiple layers, the UE comprising:
a transceiver to receive a Cyclic Shift (CS) parameter from an evolved NodeB (eNodeB), the CS parameter comprising a 3-bit value; and
a processor to generate the reference signals for N layers based on the 3-bit value,
wherein the transceiver transmits the generated reference signals to the eNodeB,
wherein N is 2 or 4,
wherein the processor applies a first Orthogonal Cover Code (OCC) for each of the N layers in response to a determination that the CS parameter is one of 011 indicating 4 as a CS parameter value of a first layer of the N layers and 100 indicating 2 as the CS parameter value of the first layer, and
wherein the processor applies a second OCC for each of the N layers in response to a determination that the CS parameter is one of 101 indicating 8 as the CS parameter value of the first layer and 110 indicating 10 as the CS parameter value of the first layer.

### Claim 18 (depends on 17)

The UE of claim 17, wherein CS parameter values of the N layers are determined based on the 3-bit value as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
λ = 1
λ = 2
λ = 3
000
0
6
3
9
001
6
0
9
3
010
3
9
6
0
011
4
10
7
1
100
2
8
5
11
101
8
2
11
5
110
10
4
1
7
111
9
3
0
6
wherein the first layer is the layer λ=0.

### Claim 19

An evolved NodeB (eNodeB) to transmit a Cyclic Shift (CS) parameter to a User Equipment (UE) that generates reference signals for multiple layers, the eNodeB comprising:
a processor to set 011 or 100 as the CS parameter or to set 101 or 110 as the CS parameter, the 011 CS parameter or the 100 CS parameter indicating a first Orthogonal Cover Code (OCC) for each of N layers of the UE, and the 101 CS parameter or the 110 CS parameter indicating a second OCC for each of the N layers of the UE; and
a transceiver to transmit the CS parameter to the UE,
wherein the 011 CS parameter indicates 4 as a CS parameter value of a first layer of the N layers, the 100 CS parameter indicates 2 as the CS parameter value of the first layer, the 101 CS parameter indicates 8 as the CS parameter value of the first layer, and the 110 CS parameter indicates 10 as the CS parameter value of the first layer, and
wherein the CS parameter is a 3-bit value, and N is 2 or 4.

### Claim 20 (depends on 19)

The eNodeB of claim 19, wherein the CS parameter indicates CS parameter values of the N layers as shown in a table defined by
CS parameter value of layer λ
CS parameter
λ = 0
λ = 1
λ = 2
λ = 3
000
0
6
3
9
001
6
0
9
3
010
3
9
6
0
011
4
10
7
1
100
2
8
5
11
101
8
2
11
5
110
10
4
1
7
111
9
3
0
6
wherein the first layer is the layer λ=0.