WO2012055178A1

WO2012055178A1 - Method and apparatus for reducing co-existence interference between lte and ism of one equipment

Info

Publication number: WO2012055178A1
Application number: PCT/CN2011/070610
Authority: WO
Inventors: 郭阳; 禹忠
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-10-28
Filing date: 2011-01-25
Publication date: 2012-05-03
Also published as: CN102457889B; CN102457889A

Abstract

A method and apparatus for reducing co-existence interference between long term evolution(LTE) and industrial scientific and medical(ISM) of one equipment are provided in the present invention in order to solve the interference problem between LTE and ISM of one equipment. The method comprises the following steps: monitoring the LTE system operating on the neighboring frequency band of the ISM operation frequency band, if it is found that the difference between CQI reported by the UE which is farthest from the interference source and the CQI reported by the UE which is nearest to the interference source exceeds a predetermined threshold, performing the interference avoidance policy, and rescheduling the frequency band occupied by the UE which is nearest to ISM frequency band. The co-existence interference between LTE system and ISM system of one equipment can be reduced by using the present invention.

Description

Method and device for reducing LTE and ISM common equipment interference

The present invention relates to the field of coexistence interference of wireless communication products, and in particular, to a method for reducing interference caused by Long Term Evolution (LTE) and Industrial Scientific and Medical (ISM) devices. And equipment. Background technique

In recent years, with the rapid development of mobile communication technology, the functions of terminal devices have become more and more diversified and complicated, especially with the development of 3G and 4G technologies, the market demand for smart devices. Increase. End devices like smart phones usually require multiple wireless access technologies in one device, such as LTE and ISM (including WLAN, Bluetooth, and GPS). Since these access technologies are in the same or similar frequency bands, once they work together, the access technology in the transmitting state will cause leakage in adjacent channels due to the action of nonlinear devices such as power amplifiers and mixers. ACLR measures), if other access technologies of the common equipment are in the receiving state at this time, it will be seriously interfered. This type of interference is often referred to as co-device interference (or coexistence interference).

Traditional methods for solving coexistence interference problems usually increase the isolation between antennas, increase the guard interval in similar frequency bands, or filter by adding filters. However, as the integration degree of the terminal device increases, the terminal becomes more and more miniaturized, and the antenna isolation has substantially no room for improvement. Increasing the guard interval means wasting valuable spectrum resources, and the harsh filters are not only difficult to design, but also cost to the end equipment vendors. More importantly, if the frequency bands are too close, such as wireless local area network (WLAN) and LTE Band40, the channel bandwidth is 20MHz. In this case, the method mentioned above is not satisfactory, so it is necessary to study one. A new method to solve the problem of LTE and ISM device interference. Summary of the invention

In view of this, the main purpose of the present invention is to provide a method and apparatus for reducing interference between LTE and ISM devices, which are used to solve the problem of interference between LTE and ISM devices.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for reducing interference between LTE and ISM devices, the method comprising:

Monitoring the LTE system operating in a frequency band adjacent to the ISM working band; the difference between the channel quality information (CQI) reported by the UE farthest from the interference source and the CQI reported by the UE closest to the interference source is greater than The interference avoidance strategy is executed when the threshold is predefined.

Further, the monitoring includes: receiving, by the base station (eNB), the CQI reported by the UE, and acquiring the CQI reported by the UE that is the farthest from the interference source and the CQI reported by the UE that is closest to the interference source, and The difference between the two is judged.

Further, the performing the interference avoidance strategy includes:

The sub-band occupied by the UE closest to the interference source is re-scheduled, and the sub-band occupied by the UE is vacated, and the sub-band is re-allocated for the UE.

Further, the frequency band adjacent to the ISM working band is specifically: Band 40 band or Band 7 band.

Based on a specific embodiment of the present invention, a device for reducing interference between LTE and ISM devices is provided, and the device includes:

a monitoring module for monitoring an LTE system operating in a frequency band adjacent to the ISM operating band;

The policy execution module is configured to perform an interference avoidance policy when a difference between a CQI reported by the UE farthest from the interference source and a CQI reported by the UE that is closest to the interference source is greater than a predefined threshold.

Further, the monitoring module includes: a CQI receiving module, configured to receive a CQI reported by a UE under the control of the base station;

The CQI acquiring module is configured to acquire a CQI reported by a UE that is farthest from the interference source and a CQI reported by the UE that is closest to the interference source;

The determining module is configured to determine the CQI and the distance interference source reported by the UE that is the farthest from the interference source. Further, the interference avoidance policy performed by the policy execution module includes:

The present invention monitors the LTE system operating in a frequency band adjacent to the ISM working band, and finds that the difference between the CQI reported by the UE that is farthest from the interference source and the CQI reported by the UE that is closest to the interference source is greater than When the threshold is predefined, the interference avoidance policy is executed to re-schedule the frequency band occupied by the UE closest to the ISM band. The invention can reduce the common equipment interference between the LTE and the ISM system. DRAWINGS

1 is a flowchart of a method for reducing interference between LTE and ISM devices according to the present invention;

FIG. 2 is a schematic structural diagram of an apparatus for reducing interference between LTE and ISM devices according to the present invention. detailed description

For the coexistence of co-device interference between LTE and ISM, since the LTE and ISM systems are on the same terminal device, the spatial distance is very close. If the bandwidth occupied by the two systems is similar, the transmission of one system to the other system is received. The interference can be very serious. In actual systems, interference in two scenarios is particularly serious:

1. The LTE TDD mode uses the Band40 band, and the occupied bandwidth is 2300MHz~2400MHz. The uplink and downlink of the ISM usually occupy 2400MHz~2480MHz. In this scenario, LTE will cause interference to the ISM, and the ISM will also cause LTE. interference. 2. In the LTE FDD mode, the Band7 band is used for uplink, and the occupied bandwidth is 2500MHz~2570MHz. The uplink and downlink of the ISM usually occupy 2400MHz~2480MHz. In this scenario, LTE will cause interference to the ISM.

When the LTE system is designed, it is usually concerned with the LTE system being interfered with and the performance is degraded. The present invention solves the problem that the LTE is degraded by the interference of the common device ISM system, and proposes a method for reducing the relationship between the LTE and the ISM. A method and a device for a common device interference, the basic idea is: performing interference monitoring on a channel quality indicator (CQI) reported by a UE in a range of UEs served by a base station, and a distance interference source served by the base station When the difference between the CQI reported by the farthest UE and the CQI reported by the UE that is closest to the interference source served by the base station is greater than a predefined certain value, the LTE system considers the distance interference served by the base station. The sub-band operated by the nearest UE has been interfered by the ISM system, and the base station performs an interference avoidance strategy.

The scenario in which LTE is most severely interfered is that the LTE system is in the downlink process, and the UE is in the receiving state, that is, similar to the first scenario. In this scenario, the LTE TDD mode uses the Band 40 frequency band. However, the present invention is not limited to the scenario in which LTE uses Band 40, so it is described later by using "Band LTE" and "Band ISM", which respectively represent the frequency band occupied by the LTE system and the frequency band occupied by the ISM system.

The present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method for reducing common device interference between LTE and ISM according to the present invention, and the detailed steps are as follows:

Step 101: Monitor an LTE system working in a frequency band adjacent to an ISM working band;

This step is used to determine which LTE systems are to be monitored, ie, the LTE system operating in a band adjacent to the ISM operating band such as Band 40 needs to be monitored, In the LTE system in the frequency band where the ISM operating band is far away, monitoring is not required because the interference is small.

Step 102: In the monitored LTE system, the base station (eNB) receives the CQI reported by the UE, and obtains the CQI (defined as CQI1) and the distance interference source reported by the UE that is the farthest from the interference source served by the eNB. CQI (defined as CQI2) reported by the UE;

In the LTE downlink process, the base station side performs transmission, and the terminal side performs reception, and the UE estimates the channel quality information (CQI) according to the quality of the received data and the pilot signal, and reports the CQI to the eNB, and the eNB may The size of the interference to the LTE system to the ISM system is monitored by CQI.

During the operation of the LTE system, the base station side simultaneously communicates with the N UEs at the same time. The sub-band occupied by the UE is relatively close to the working frequency band of the interference source ISM, and the sub-band distance occupied by the UE is the interference source ISM. The working frequency band is relatively long. At this time, the eNB needs to perform monitoring. When the CQI reported by the UE far away from the interference source is much better than the CQI reported by the UE near the interference source (the value of the CQI is from 0-15, A larger value indicates better performance. It indicates that there may be an ISM interference source and an interference avoidance strategy is required.

Step 103: The base station determines that the CQI1 and the distance interference source reported by the UE farthest from the interference source are determined to be interference, and step 104 is performed, otherwise, it is determined that there is no interference, and step 102 is continued;

When the difference between CQI1-CQI2 is greater than a predefined threshold Q, the base station determines that there is an ISM interference source and needs to perform an interference avoidance strategy. The predefined threshold value Q may be a preferred value, for example, Q is 2 or 3;

Step 104: The step is used to perform an interference avoidance policy, that is, the LTE system (eNB side) considers that the UE closest to the ISM frequency band has been interfered, and re-schedules the sub-band occupied by the UE, and uses the UE to use This sub-frequency closest to the ISM operating band If the segment is vacant, re-distribute the UE to a sub-band that is far away from the ISM working band. After performing this step, execute 102;

In the next cycle, step 102 re-determines the nearest and farthest UE from the interferer in the UE it serves. If CQI1-CQI2>Q, the interference avoidance policy continues to be executed until CQI1-CQI2 is not greater than Q.

FIG. 2 is a schematic diagram of an apparatus 200 for reducing LTE and ISM common equipment interference according to the present invention. The apparatus includes: a monitoring module 210 and a policy execution module 220.

The monitoring module 210 is configured to monitor an LTE system operating in a frequency band adjacent to an ISM working band; the module further includes:

The CQI receiving module 201 is configured to receive the CQI reported by the UE under the control of the base station;

The CQI obtaining module 202 is configured to acquire a CQI reported by a UE that is farthest from the interference source and a CQI reported by the UE that is closest to the interference source;

The determining module 203 is configured to determine the difference between the CQI reported by the UE farthest from the interference source and the CQI reported by the distance interference policy execution module 220 when the UE farthest from the interference source reports the CQI reported by the UE closest to the interference source. When the value is greater than the predefined threshold, the interference avoidance strategy is executed. The interference avoidance policy performed by the policy execution module is specifically: rescheduling the sub-band occupied by the UE that is closest to the interference source, and vacating the sub-band occupied by the UE is not used, and re-assigning the sub-band to the UE. The frequency band adjacent to the ISM working band is specifically: Band 40 band or Band 7 band.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A method for reducing long-term evolution (LTE) and ISM common device interference, characterized in that the method comprises:

Monitoring the LTE system operating in a frequency band adjacent to the ISM working band; between the channel quality information (CQI) reported by the user equipment (UE) farthest from the interference source and the CQI reported by the UE closest to the interference source The interference avoidance strategy is executed when the difference is greater than the predefined threshold.

The method according to claim 1, wherein the monitoring comprises: receiving, by the base station (eNB), the CQI reported by the UE under the UE, and acquiring the CQI reported by the UE that is the farthest from the interference source served by the eNB. The CQI reported by the UE closest to the interference source is judged, and the difference between the two is judged.

The method according to claim 1 or 2, wherein the performing the interference avoidance policy comprises:

The method according to claim 1, wherein the frequency band adjacent to the ISM working band is specifically: Band 40 band or Band 7 band.

5. A device for reducing interference between LTE and ISM devices, characterized in that the device comprises:

The device according to claim 5, wherein the monitoring module comprises: a CQI receiving module, configured to receive a CQI reported by a UE under the control of the base station;

a judging module, configured to determine a CQI and a distance interference source reported by a UE that is farthest from the interference source

The device according to claim 5 or 6, wherein the interference avoidance strategy executed by the policy execution module comprises:

The device according to claim 5 or 6, wherein the frequency band adjacent to the ISM working band is specifically: Band 40 band or Band 7 band.