# US 2014/0192750 A1 · Method and apparatus for transmitting reference signal in multi-antenna system

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- Number: US 2014/0192750 A1
- Document ID: US20140192750A1
- Status: Published application
- Kind: A1
- Application number: 14/209,901
- Filed: 2014-03-13
- Published: 2014-07-10
- Earliest claimed: 2009-05-21
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Min Seok NOH; Jae Hoon CHUNG; Yeong Hyeon KWON; Hyun Soo KO; Seung Hee HAN; Moon Il LEE
- Web page: https://patentgrep.com/patent/US20140192750A1

## CPC

- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04B 7/0613: {using simultaneous transmission (H04B7/0686 takes precedence)}
- H04B 7/0684: {using different training sequences per antenna}
- H04J 13/0074: {Code shifting or hopping}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0026: {Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 25/0226: {sounding signals per se}
- H04L 27/26035: {Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences (using different training sequence per antenna H04B7/0684; code allocation H04J13/16)}
- H04L 27/2613: {Structure of the reference signals}
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/0023: {Time-frequency-space}
- H04W 88/02: Terminal 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

Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences to which cyclic shift values different from each other are allocated, generates an orthogonal frequency division multiplexing (OFDM) symbol to which the plurality of reference signal sequences are mapped, and transmits the OFDM symbol to a base station through a plurality of antennas. The respective cyclic shift values allocated to the respective reference signal sequences are determined on the basis of a parameter n indicated by a cyclic shift field transmitted from a physical downlink control channel (PDCCH).

## Claims

### Claim 1

A method for receiving, by a base station (BS), demodulation reference signals (DMRSs) for a physical uplink shared channel (PUSCH) in a wireless communication system, the method comprising:
receiving first, second, third and fourth DMRS sequences, which are respectively associated with first, second, third, and fourth layers, from a user equipment (UE),
wherein the first, second, third and fourth DMRS sequences are generated, by the UE, by using first, second, third, and fourth values assigned for the first, second, third and fourth DMRS layers respectively,
wherein the first and second values are separated by a maximum value corresponding to a total number of possible cyclic shifts, and
wherein the third and fourth values are separated by the maximum value corresponding to a total number of possible cyclic shifts, and
wherein the first, second, third and fourth DMRS sequences are mapped, by the UE, to resource elements (REs) in two slots,
wherein the first and second DMRS sequences mapped in a second slot among the two slots are multiplied by 1, and
wherein the third and fourth DMRS sequences mapped in the second slot among the two slots are multiplied by −1.

### Claim 2 (depends on 1)

The method of claim 1, wherein the total number of possible cyclic shifts is 12.

### Claim 3 (depends on 1)

The method of claim 1, wherein the maximum value corresponding to the total number of possible cyclic shifts is 6.

### Claim 4 (depends on 1)

The method of claim 1, wherein the third value is separated from each of the first and second values by a medium value between the first and second values.

### Claim 5 (depends on 1)

The method of claim 1, wherein the first, second, third and fourth values are {0, 6, 3, 9}, respectively.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first, second, third and fourth values are {9, 3, 0, 6}, respectively.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
transmitting an uplink downlink control information (DCI) format, which includes a cyclic shift field indicating the first, second, third and fourth values, to the UE.

### Claim 8 (depends on 7)

The method of claim 7, wherein the uplink DCI format is transmitted via a physical downlink control channel (PDCCH).

### Claim 9 (depends on 1)

The method of claim 1, wherein the first, second, third and fourth DMRS sequences are mapped in a fourth symbol in each slot including 7 symbols.

### Claim 10 (depends on 1)

The method of claim 1, wherein the first, second, third and fourth DMRS sequences are mapped in a third symbol in each slot including 6 symbols.

### Claim 11

A base station (BS) in a wireless communication system, the BS comprising:
a radio frequency (RF) unit for transmitting or receiving a radio signal; and
a processor coupled to the RF unit, and configured to:
receive first, second, third and fourth DMRS sequences, which are respectively associated with first, second, third, and fourth layers, from a user equipment (UE),
wherein the first, second, third and fourth DMRS sequences are generated, by the UE, by using first, second, third, and fourth values assigned for the first, second, third and fourth DMRS layers respectively,
wherein the first and second values are separated by a maximum value corresponding to a total number of possible cyclic shifts, and
wherein the third and fourth values are separated by the maximum value corresponding to a total number of possible cyclic shifts, and
wherein the first, second, third and fourth DMRS sequences are mapped, by the UE, to resource elements (REs) in two slots,
wherein the first and second DMRS sequences mapped in a second slot among the two slots are multiplied by 1, and
wherein the third and fourth DMRS sequences mapped in the second slot among the two slots are multiplied by −1.

### Claim 12 (depends on 11)

The BS of claim 11, wherein the total number of possible cyclic shifts is 12.

### Claim 13 (depends on 11)

The BS of claim 11, wherein the maximum value corresponding to the total number of possible cyclic shifts is 6.

### Claim 14 (depends on 11)

The BS of claim 11, wherein the third value is separated from each of the first and second values by a medium value between the first and second values.

### Claim 15 (depends on 11)

The BS of claim 11, wherein the first, second, third and fourth values are {0, 6, 3, 9}, respectively.

### Claim 16 (depends on 11)

The BS of claim 11, wherein the first, second, third and fourth values are {9, 3, 0, 6}, respectively.

### Claim 17 (depends on 11)

The BS of claim 11, wherein the processor is further configured to:
transmit an uplink downlink control information (DCI) format, which includes a cyclic shift field indicating the first, second, third and fourth values, to the UE.

### Claim 18 (depends on 17)

The BS of claim 17, wherein the uplink DCI format is transmitted via a physical downlink control channel (PDCCH).

### Claim 19 (depends on 11)

The BS of claim 11, wherein the first, second, third and fourth DMRS sequences are mapped in a fourth symbol in each slot including 7 symbols.

### Claim 20 (depends on 11)

The BS of claim 11, wherein the first, second, third and fourth DMRS sequences are mapped in a third symbol in each slot including 6 symbols.