# US 2018/0323918 A1 · Tracking Reference Signal And Framework Thereof In Mobile Communications

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- Number: US 2018/0323918 A1
- Document ID: US20180323918A1
- Status: Published application
- Kind: A1
- Application number: 15/969,510
- Filed: 2018-05-02
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: Mediatek Inc.
- Applicants: MediaTek Inc.
- Inventors: Chiao-Yao Chuang; Song-Jheng Lin; Jianxuan Du; Yen-Hui Yeh
- Web page: https://patentgrep.com/patent/US20180323918A1

## CPC

- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- 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
- 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 25/0232: {by interpolation between sounding signals}
- H04L 27/261: {Details of reference signals}
- H04L 27/2657: {Carrier synchronisation}
- H04W 72/044: based on the type of the allocated resource
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Techniques and examples of tracking reference signal and framework thereof in mobile communications are described. A user equipment (UE) receives, from a base station of a network, a reference signal via a communication link between the UE and the base station. The reference signal contains resource configuration with respect to tracking reference signal (TRS) configuration. The UE also receives, from the base station, a TRS burst containing a plurality of TRS symbols with one or more components of the UE configured according to the TRS configuration. The UE processes the TRS burst to perform channel estimation, synchronization, time tracking, frequency tracking, or a combination thereof.

## Claims

### Claim 1

A method, comprising:
receiving, by a processor of a user equipment (UE) from a base station of a network, a reference signal via a communication link between the UE and the base station, the reference signal containing resource configuration with respect to tracking reference signal (TRS) configuration;
receiving, by the processor from the base station, a TRS burst containing a plurality of TRS symbols with one or more components of the UE configured according to the TRS configuration; and
processing, by the processor, the TRS burst to perform channel estimation, synchronization, time tracking, frequency tracking, or a combination thereof.

### Claim 2 (depends on 1)

The method of claim 1, wherein the channel estimation comprises one or more of time delay estimation, delay spread estimation, frequency offset estimation, and Doppler spread estimation.

### Claim 3 (depends on 1)

The method of claim 1, wherein a symbol spacing between two neighboring TRS symbols in the TRS burst is greater than or equal to 3 symbols, wherein the receiving of the TRS burst comprises receiving the plurality of TRS symbols of the TRS burst through a same antenna port of the UE, and wherein the plurality of TRS symbols occupy a same subcarrier location.

### Claim 4 (depends on 1)

The method of claim 1, wherein the processing of the TRS burst to perform the channel estimation comprises performing frequency offset estimation using two TRS symbols that are adjacent among the plurality of TRS symbols in the TRS burst.

### Claim 5 (depends on 1)

The method of claim 1, wherein the processing of the TRS burst to perform the channel estimation comprises performing frequency offset estimation using two TRS symbols that are non-adjacent among the plurality of TRS symbols in the TRS burst.

### Claim 6 (depends on 1)

The method of claim 1, wherein a pattern of the plurality of TRS symbols in the TRS burst is non-uniform.

### Claim 7 (depends on 1)

The method of claim 1, wherein the TRS configuration defines a plurality of parameters comprising:
X=a length of the TRS burst in terms of a number of 14-symbol slots;
Y=a periodicity of the TRS burst;
N=a number of orthogonal frequency-division multiplexing (OFDM) symbols occupied by one or more TRS symbol of the plurality of TRS symbols within each slot;
B=a TRS bandwidth in terms of a number of resource blocks (RBs);
Sf=a TRS subcarrier spacing in a frequency domain; and
St=a TRS symbol spacing between two neighboring TRS symbols of the plurality of TRS symbols in a time domain.

### Claim 8 (depends on 7)

The method of claim 7, wherein N=2, wherein there are fourteen OFDM symbols within each slot as denoted by symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, symbol 5, symbol 6, symbol 7, symbol 8, symbol 9, symbol 10, symbol 11, symbol 12 and symbol 13, and wherein two of the fourteen OFDM symbols used for TRS comprise a pair of symbol 4 and symbol 8, a pair of symbol 5 and symbol 9, or a pair of symbol 6 and symbol 10.

### Claim 9 (depends on 7)

The method of claim 7, wherein, for the TRS burst, X=2, N1=2 for a first slot of the TRS burst, N2=2 for a second slot of the TRS burst, and there are four TRS symbols in the TRS burst (Ntotal=4), wherein St1 denotes a symbol spacing between a first TRS symbol in the first slot and a second TRS symbol in the first slot, wherein St2 denotes a symbol spacing between the second TRS symbol in the first slot and a first TRS symbol in the second slot, wherein St3 denotes a symbol spacing between the first TRS symbol in the second slot and a second TRS symbol in the second slot, and wherein St2 is greater than or equal to St3 which is greater than or equal to St1 (St2>=St3>=St1).

### Claim 10 (depends on 9)

The method of claim 9, wherein St3=St1.

### Claim 11 (depends on 9)

The method of claim 9, wherein St3>St1.

### Claim 12 (depends on 9)

The method of claim 9, wherein St2>=St3>St1.

### Claim 13 (depends on 7)

The method of claim 7, wherein, for the TRS burst, X=1, N1=2 for a first slot of the TRS burst and there are two TRS symbols in the TRS burst (Ntotal=2), and wherein St1 denotes a symbol spacing between a first TRS symbol in the first slot and a second TRS symbol in the first slot.

### Claim 14 (depends on 13)

The method of claim 13, wherein St1>=3.

### Claim 15

An apparatus implementable in a user equipment (UE), comprising:
a transceiver capable of wirelessly communicating with a base station of a network; and
a processor coupled to the transceiver, the processor capable of performing operations comprising:
receiving, via the transceiver from the base station, a reference signal via a communication link between the UE and the base station, the reference signal containing resource configuration with respect to tracking reference signal (TRS) configuration;
receiving, via the transceiver from the base station, a TRS burst containing a plurality of TRS symbols with one or more components of the UE configured according to the TRS configuration; and
processing the TRS burst to perform channel estimation, synchronization, time tracking, frequency tracking, or a combination thereof,
wherein the processor receives the plurality of TRS symbols of the TRS burst through a same antenna port of the UE, and
wherein the plurality of TRS symbols occupy a same subcarrier location.

### Claim 16 (depends on 15)

The apparatus of claim 15, wherein the channel estimation comprises one or more of time delay estimation, delay spread estimation, frequency offset estimation, and Doppler spread estimation, and wherein a symbol spacing between two neighboring TRS symbols in the TRS burst is greater than or equal to 3 symbols.

### Claim 17 (depends on 15)

The apparatus of claim 15, wherein the TRS configuration defines a plurality of parameters comprising:
X=a length of the TRS burst in terms of a number of 14-symbol slots;
Y=a periodicity of the TRS burst;
N=a number of orthogonal frequency-division multiplexing (OFDM) symbols occupied by one or more TRS symbol of the plurality of TRS symbols within each slot;
B=a TRS bandwidth in terms of a number of resource blocks (RBs);
Sf=a TRS subcarrier spacing in a frequency domain; and
St=a TRS symbol spacing between two neighboring TRS symbols of the plurality of TRS symbols in a time domain.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein N=2, wherein there are fourteen OFDM symbols within each slot as denoted by symbol 0, symbol 1, 2, 3, symbol 4, symbol 5, symbol 6, symbol 7, symbol 8, symbol 9, symbol 10, symbol 11, symbol 12 and symbol 13, and wherein two of the fourteen OFDM symbols used for TRS comprise a pair of symbol 4 and symbol 8, a pair of symbol 5 and symbol 9, or a pair of symbol 6 and symbol 10.

### Claim 19 (depends on 17)

The apparatus of claim 17, wherein, for the TRS burst, X=2, N1=2 for a first slot of the TRS burst, N2=2 for a second slot of the TRS burst, and there are four TRS symbols in the TRS burst (Ntotal=4), wherein St1 denotes a symbol spacing between a first TRS symbol in the first slot and a second TRS symbol in the first slot, wherein St2 denotes a symbol spacing between the second TRS symbol in the first slot and a first TRS symbol in the second slot, wherein St3 denotes a symbol spacing between the first TRS symbol in the second slot and a second TRS symbol in the second slot, and wherein St2 is greater than or equal to St3 which is greater than or equal to St1 (St2>=St3>=St1).

### Claim 20 (depends on 17)

The apparatus of claim 17, wherein, for the TRS burst, X=1, N1=2 for a first slot of the TRS burst and there are two TRS symbols in the TRS burst (Ntotal=2), and wherein St1 denotes a symbol spacing between a first TRS symbol in the first slot and a second TRS symbol in the first slot.