# US 2021/0344369 A1 · Method for reducing sglte coupling de-sense and mobile terminal

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- Number: US 2021/0344369 A1
- Document ID: US20210344369A1
- Status: Published application
- Kind: A1
- Application number: 17/272,668
- Filed: 2019-10-29
- Published: 2021-11-04
- Earliest claimed: 2018-11-21
- Assignees: Huizhou Tcl Mobile Communication Co., Ltd.
- Applicants: HuiZhou TCL Mobile Communication Co., Ltd.
- Inventors: Sheng ZHANG; Zhihao ZHENG
- Web page: https://patentgrep.com/patent/US20210344369A1

## CPC

- H04B 1/1036: {with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H)}
- H04B 1/1018: {noise filters connected between the power supply and the receiver}
- H04B 1/109: {by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input}
- H04B 1/12: Neutralising, balancing, or compensation arrangements
- H04B: TRANSMISSION

## Abstract

Disclosed in the present application are a method for reducing SGLTE coupling de-sense and a mobile terminal, the method including: filtering out an LTE network frequency band in a signal transmitted by a signal transmission end of a GSM; and filtering out a network frequency band in a signal of a signal reception end accessing the GSM other than a GSM network frequency band. Employing the present application may eliminate mutual interference between a GSM signal and an LTE signal due to the GSM network frequency band and the LTE network frequency band getting too close to each other, which greatly alleviates SGLTE mobile terminal coupling de-sense situation.

## Claims

### Claim 1

A method for reducing SGLTE coupling de-sense, comprising:
filtering out an LTE frequency band in a signal to be transmitted in a GSM signal transmission end;
filtering out all frequency bands other than a GSM frequency band in a received signal on a GSM signal reception end.

### Claim 2 (depends on 1)

The method for reducing the SGLTE coupling de-sense according to claim 1, the step of filtering out the LTE frequency band in the signal to be transmitted on the GSM signal transmission end comprises:
keeping a GSM transmission loss below 1 dB.

### Claim 3 (depends on 1)

The method for reducing the SGLTE coupling de-sense according to claim 1, the step of filtering out the LTE frequency band in the signal to be transmitted on the GSM signal transmission end comprises:
setting a band stop filter in a GSM transmission path to filter out the LTE frequency band in the signal to be transmitted on the GSM signal transmission end.

### Claim 4 (depends on 3)

The method for reducing the SGLTE coupling de-sense according to claim 3, wherein the band stop filter passes a frequency band of 1710-1785 Mhz and blocks a frequency band of 1880-1920 Mhz.

### Claim 5 (depends on 3)

The method for reducing the SGLTE coupling de-sense according to claim 3, wherein the step of setting the band stop filter comprises: deploying the band stop filter between a GSM power amplifier and a GSM path switch.

### Claim 6 (depends on 5)

The method for reducing the SGLTE coupling de-sense according to claim 5, wherein the band stop filter is composed of a piezoelectric crystal oscillator material.

### Claim 7 (depends on 6)

The method for reducing the SGLTE coupling de-sense according to claim 6, wherein the band stop filter is made of piezoelectric ceramic, lithium niobate and quartz laminated.

### Claim 8 (depends on 1)

The method for reducing SGLTE coupling de-sense according to claim 1, further comprising:
setting a GSM reception filter on a GSM reception path to receive the GSM signals.

### Claim 9 (depends on 1)

The method for reducing the SGLTE coupling de-sense according to claim 1, further comprising:
filtering out all frequency bands other than the LTE frequency band in signals received/transmitted in an LTE path.

### Claim 10 (depends on 9)

The method for reducing the SGLTE coupling de-sense according to claim 9, wherein the step of filtering out all frequency bands other than the LTE frequency band in signals received/transmitted in the LTE path comprises:
deploying an LTE filter in the LTE path to filter out all frequency bands other than the LTE frequency band in signals received/transmitted in the LTE path.

### Claim 11

A mobile terminal capable of SGLTE communications, comprising:
a GSM signal transmission end coupled to a GSM transmission path for transmitting GSM signals;
a GSM signal reception end coupled to a GSM reception path;
a band stop filter deployed in the GSM transmission path to filter out an LTE frequency band in a signal to be transmitted in the GSM signal transmission end; and
A GSM reception filter deployed in the reception path to filter out all frequency bands other than a GSM frequency band in a received signal on the GSM signal reception end.

### Claim 12

A mobile terminal, comprising:
a GSM signal transmission end coupled to a GSM transmission path for transmitting GSM signals;
a GSM signal reception end coupled to a GSM reception path for receiving GSM signals;
a band stop filter coupled to the GSM signal transmission end;
a processor, adapted to execute instructions; and
a memory, adapted to store instructions, wherein:
the processor loads the instructions from the memory to perform the following steps:
employing the band stop filter to filter out an LTE frequency band in a signal to be transmitted in the GSM signal transmission end while keeping a GSM transmission loss under 1 dB; and
filtering out all frequency bands other than a GSM frequency band in a received signal on the GSM signal reception end.

### Claim 13 (depends on 12)

The mobile terminal according to claim 12, wherein the band stop filter passes a frequency band of 1710-1785 Mhz and blocks a frequency band of 1880-1920 Mhz.

### Claim 14 (depends on 12)

The mobile terminal according to claim 12, wherein the band stop filter attenuates the frequency band of 1880-1920 MHz by 20 dB or greater than 20 dB.

### Claim 15

(canceled)

### Claim 16 (depends on 12)

The mobile terminal according to claim 12, further comprising:
a GSM reception filter coupled to the GSM reception path, filtering out all frequency bands other than a GSM frequency band in a received signal on the GSM signal reception end;
a GSM power amplifier and a GSM path switch coupled to the GSM transmission end; wherein the band stop filter is provided between the GSM power amplifier and the GSM path switch.

### Claim 17 (depends on 16)

The mobile terminal according to claim 16, wherein the band stop filter is composed of a piezoelectric crystal oscillator material.

### Claim 18 (depends on 17)

The mobile terminal according to claim 17, wherein the band stop filter is made of piezoelectric ceramic, lithium niobate, and quartz laminated.

### Claim 19 (depends on 12)

The mobile terminal according to claim 12, further comprising:
an LTE path for transmission/reception of LTE signals; and
an LTE filter deployed on the LTE path, filtering out all frequency bands other than the LTE frequency band in signals received/transmitted in the LTE path.

### Claim 20

(canceled)