# US 11,444,741 B2 · Unified scrambling of reference signals

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- Number: US 11,444,741 B2
- Document ID: US11444741B2
- Status: Granted
- Kind: B2
- Application number: 16/646,447
- Filed: 2018-10-01
- Published: 2020-08-27
- Granted: 2022-09-13
- Earliest claimed: 2017-10-02
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Karl Werner; Mattias Frenne; Stephen Grant; Lars Lindbom
- Web page: https://patentgrep.com/patent/US11444741B2

## CPC

- H04L 25/0226: {sounding signals per se}
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/2613: {Structure of the reference signals}
- 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: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

According to certain embodiments, a method in a radio node includes obtaining a parameter associated with a reference signal type and using the parameter associated with the reference signal type to calculate an initial value, Cinit, for a reference signal. A reference signal sequence is generated using Cinit, and the reference signal is demodulated using the reference signal sequence.

## Claims

### Claim 1

A method in a radio node, the method comprising:
for calculating an initialization value, Cinit, for a reference signal, obtaining a parameter associated with a reference signal type;
calculating Cinit using an equation and using at least the parameter associated with the reference signal type, wherein the Cinit is a function of the reference signal type, such that with a different reference signal type, a different Cinit is calculated using the equation;
generating a reference signal sequence using Cinit; and
demodulating the reference signal using the reference signal sequence.

### Claim 2 (depends on 1)

The method of claim 1, wherein Cinit is calculated using at least one additional parameter, the at least one additional parameter comprising a reference signal identifier, nID, and/or a symbol counter, lcounter.

### Claim 3 (depends on 2)

The method of claim 2, wherein the reference signal identifier, nID, is specific to a user equipment (UE).

### Claim 4 (depends on 2)

The method of claim 2, wherein Cinit is calculated according to the equation:
cinit=2X·(lcounter)·(2·nID+1)+2Y·nID+nRStype
wherein:
nRStype is the parameter associated with the reference signal type,
lcounter is a symbol counter associated with a time unit of a radio frame, and
X and Y comprise first and second parameters affecting different bits in a binary representation of the quantity Cinit.

### Claim 5 (depends on 2)

The method of claim 2, wherein Cinit is calculated according to the equation:
cinit=2X·XOR((lcounter)·(2·nID+1),nRStype)+2Y·nID
wherein:
nRStype is the parameter associated with the reference signal type,
lcounter is a symbol counter associated with a time unit of a radio frame, and
X and Y comprise first and second parameters affecting different bits in a binary representation of the quantity Cinit.

### Claim 6 (depends on 4)

The method of claim 4, wherein lcounter is associated with a wraparound limit.

### Claim 7 (depends on 2)

The method of claim 2, wherein a value of the parameter nID is received from a network node.

### Claim 8 (depends on 2)

The method of claim 2, wherein a value of the parameter nID is specifically configured for the radio node.

### Claim 9 (depends on 1)

The method of claim 1, wherein Cinit is calculated according to the equation:
cinit=210·ƒ((l+14·ns)mod N,nID,nRStype)+nID
wherein:
nRStype is the parameter associated with the reference signal type,
ƒ((l+14·ns) mod N,nID,nRstype) and N are selected to use a maximum of 21 bits,
nID is a UE-specific identifier for the reference signal, and
ns is a slot index within a frame.

### Claim 10 (depends on 1)

The method of claim 1, wherein the reference signal comprises at least one of:
a channel state information reference signal (CSI-RS);
a tracking reference signal (TRS);
a demodulation reference signal (DMRS); and
a positioning reference signal (PRS).

### Claim 11 (depends on 1)

The method of claim 1, wherein the reference signal is a channel state information reference signal (CSI-RS) and the parameter associated with the reference signal type is based on a use of the CSI-RS, wherein the use of the CSI-RS comprises beam management or channel state information (CSI) acquisition.

### Claim 12 (depends on 1)

The method of claim 1, wherein the radio node is a wireless device.

### Claim 13 (depends on 1)

The method of claim 1, wherein the radio node is a network node.

### Claim 14

A radio node, comprising:
processing circuitry configured to:
for calculating an initialization value, Cinit for a reference signal, obtaining a parameter associated with a reference signal type;
calculate Cinit using an equation and using at least the parameter associated with the reference signal type, wherein the Cinit is a function of the reference signal type, such that with a different reference signal type, a different Cinit is calculated using the equation;
generate a reference signal sequence using Cinit; and
demodulate the reference signal using the reference signal sequence.

### Claim 15 (depends on 14)

The radio node of claim 14, wherein Cinit is calculated using at least one additional parameter, the at least one additional parameter comprising, a UE specific reference signal identifier, nID, and/or a symbol counter, lcounter.

### Claim 16 (depends on 15)

The radio node of claim 15, wherein the reference signal identifier, nID, is specific to a user equipment (UE).

### Claim 17 (depends on 15)

The radio node of claim 15, wherein Cint is calculated according to the equation:
cinit=2X·(lcounter)·(2·nID+1)+2Y·nID+nRStype
wherein:
nRStype is the parameter associated with the reference signal type,
lcounter is a symbol counter associated with a time unit of a radio frame, and
X and Y comprise first and second parameters affecting different bits in a binary representation of the quantity Cinit.

### Claim 18 (depends on 15)

The radio node of claim 15, wherein Cinit is calculated according to the equation:
cinit=2X·XOR((lcounter)·(2·nID+1),nRStype)+2Y·nID
wherein:
nRStype is the parameter associated with the reference signal type,
lcounter is a symbol counter associated with a time unit of a radio frame, and
X and Y comprise first and second parameters affecting different bits in a binary representation of the quantity Cinit.

### Claim 19 (depends on 17)

The radio node of claim 17, wherein lcounter is associated with a wraparound limit.

### Claim 20 (depends on 15)

The radio node of claim 15, wherein the wireless device further comprises an interface operably coupled to the processor and the interface is configured to receive a value of nID from a network node.

### Claim 21 (depends on 15)

The radio node of claim 15, wherein a value of nID is specifically configured for the radio node.

### Claim 22 (depends on 14)

The radio node of claim 14 wherein Cinit is calculated according to the equation:
cinit=210·ƒ((l+14·ns)mod N,nID,nRStype)+nID
wherein:
nRstype is the parameter associated with the reference signal type,
l is an OFDM symbol within a 14 symbols slot,
ƒ((l+14·ns)mod N, nID,nRstype) and N are selected to use a maximum of 21 bits,
nID is a UE-specific identifier for the reference signal, and
ns is a slot index within a frame.

### Claim 23 (depends on 14)

The radio node of claim 14, wherein the reference signal comprises at least one of:
a channel state information reference signal (CSI-RS);
a tracking reference signal (TRS);
a demodulation reference signal (DMRS); and
a positioning reference signal (PRS).

### Claim 24 (depends on 14)

The radio node of claim 14, wherein the reference signal is a channel state information reference signal (CSI-RS) and the parameter associated with the reference signal type is based on a use of the CSI-RS, wherein the use of the CSI-RS comprises beam management or channel state information (CSI) acquisition.

### Claim 25 (depends on 14)

The radio node of claim 14, wherein the radio node comprises a wireless device.

### Claim 26 (depends on 14)

The radio node of claim 14, wherein the radio node comprises a network node.