WO2012040940A1

WO2012040940A1 - Method and apparatus for measuring quality of radio signal

Info

Publication number: WO2012040940A1
Application number: PCT/CN2010/077548
Authority: WO
Inventors: 杜忠达; 邬华明; 汪孙节; 朱常青
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-09-30
Filing date: 2010-09-30
Publication date: 2012-04-05

Abstract

A method and apparatus for measuring the quality of radio signal are provided in the present invention. The method includes the following steps: when a user equipment (UE) is interfered by the base station in an interfering cell, the UE utilizes the limited measurement manner; wherein, the limited measurement manner means that when measuring the radio signal quality of the base station in the serving cell, according to the resource partition situation of the base station in the interfering cell, the UE ignores the radio signal quality at the interfered sub-frames, and only considers the radio signal quality at the non-interfered sub-frames; wherein, the non-interfered sub-frames are the sub-frames configured to be used by the base station in the serving cell, and the other sub-frames are the interfered sub-frames. With the present invention, the declaration of wrong radio link failure can be avoided.

Description

Method and device for measuring wireless signal quality

The present invention relates to signal measurement techniques, and more particularly to a method and apparatus for measuring wireless signal quality. Background technique

With the development of wireless communication systems, the network topology has become more and more complicated. One trend is for homogeneous networks to coexist with cellular base stations with smaller coverage, such as microcells, pico cells, and femto cells. As a result, the entire network becomes a heterogeneous network. In order to simplify the description, these cellular base stations with a small coverage range may be collectively referred to as a low power node (LPN). FIG. 1 is a schematic diagram of respective coverage areas of a macrocell macrocell and a low power node.

When macrocell base stations and LPNs belong to different frequency layers, the most important issue is mobility management. Generally, the operator causes the high-speed mobile user equipment (UE) to stay and move in the macro-cell base station; if the coverage of the low-power node is available to the low-speed mobile UE, the low-speed mobile UE stays in the low-power node And moving. Sometimes a macrocell base station is also called an umbrella cell.

When the macro cell base station and the LPN belong to the same frequency layer, the problem of co-channel interference occurs. This is because: Usually LPN is used to increase capacity rather than expand coverage. Therefore these LPNs are located within the coverage of the macrocell base station. When the UE accesses the macro cell base station, it will be interfered by the downlink of the LPN, such as the downlink interference of the femtocell base station that does not allow access by the UE.

There are two typical interference scenarios for co-channel interference. The first scenario is that a UE (referred to as MUE) accessing a macrocell base station is interfered by a femtocell. Femtocells only authenticated A small number of UEs have been accessed. And the femtocell base station operates in an uncoordinated manner. As shown in FIG. 2, when the MUE traverses the coverage of the femtocell that does not allow itself to access, even if the radio signal quality of the femtocell is good, the MUE does not allow access to the femtocell. Therefore, the downlink of the MUE is interfered by the femtocell.

Another scenario is that a UE (referred to as a PUE) accessing a picocell base station is interfered by a macrocell base station. As shown in Figure 3, the PUE is close to the coverage of the picocell. When a measurement event is triggered and the PUE sends a measurement report to the macrocell, the macrocell knows that the radio signal quality of the picocell is good. Since the UEs all allow access to the picocell, when the PUE is close to the picocell, the PUE disconnects from the macrocell and accesses the picocell. Since part or all of the picocell base station is located in the macrocell base station, the downlink of the PUE is interfered by the macrocell base station.

At present, one method for solving the problem of co-channel interference is to perform resource division between a macro cell base station and a femto cell base station, or between a macro cell base station and a pico cell base station, that is, the interfering cell base station temporarily reduces or disables. Part of the radio resources, and let the victim cellular base station work during these time periods. The interfering cellular base station (aggressor) refers to a cell that interferes with other cellular base stations, and the victim cellular base station (victim) refers to a cell that is interfered by other cellular base stations. In a Long Term Evolution (LTE) system, one radio frame consists of ten 1 ms subframes. Usually, the resource granularity of an LTE system is also a subframe in the time domain. Therefore, a subframe can be used as a unit of resource division when resource division. Figure 4 shows an example of resource partitioning. As shown in Figure 4, the even-numbered subframes are allocated to the interfering cellular base station, that is, the interfering cellular base station reduces or stops using the odd-numbered subframes, and the odd-numbered sub-frames The frame configuration is used by the victim cellular base station. The subframes configured for use by the victim cellular base station (generally the serving cellular base station) are referred to as non-interfering subframes, and the other subframes are referred to as interfered subframes.

A sub-frame consists of several symbols, such as 14 symbols, as shown in Figure 5. Usually, the first few symbols, such as 1~3 symbols, are used by the physical layer control signaling; among the remaining symbols, except for some reference letters. The number is used by data other than the cell-specific reference signal (CRS). In Figure 5, each small square represents a resource element (RE) that is determined by a symbol in the time domain and a subcarrier on the frequency domain. For control signaling or data, an RE can carry one symbol.

Currently, a method for configuring a non-interfering subframe is: the non-interfering subframe can be configured as a multimedia broadcast multicast service (MBMS) subframe, that is, the first few symbols used by the physical control signaling are not processed. The rest of the symbols are vacant, including all the symbols that should have been used by the data and CRS. Another method is: In the entire sub-frame, only the symbols used by the CRS are not processed, and the rest of the symbols are all vacant.

If the interfered cellular base station uses these non-interfering subframes, the problem of co-channel interference seems to be resolved. However, this can cause a wrong radio link failure (RLF). In an LTE system, the UE monitors the downlink radio signal quality by measuring the CRS of the serving cell site every 10 ms, so each subframe is possible. Measured by the UE at the physical layer. If the radio signal quality of the serving cellular base station is always worse than the predetermined threshold Qout within a predetermined time, the UE announces that the radio link fails; unless the radio signal quality of the serving cellular base station is scheduled before the UE announces If the time becomes better than the predetermined threshold Qin, the UE does not announce the UE. If the radio link monitor (RLM) mode is not changed after the interfered cellular base station uses the non-dry 4 subframe, the UE The wrong RLF may be announced. The reason is: The UE will measure the interfered subframes that are used by the interfering cellular base station and the interfered cellular base station. Therefore, the quality of the wireless signal is poorly monitored in these interfered subframes, and then the announcement is made. RLF; However, since the resource partitioning is used, the communication of the user plane is still normal, so the RLF is wrong. In addition, when the RLF is announced, the UE disconnects from the radio link and re-establishes a Radio Resource Control (RRC) connection, which will interrupt the ongoing communication between the UE and the serving cellular base station.

In view of this, the main object of the present invention is to provide a method for measuring wireless signal quality. And the device can prevent the UE from declaring the wrong RLF.

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

A method of measuring wireless signal quality, including:

When the UE is interfered by the interfering cellular base station, the UE uses the limited measurement mode. The restricted measurement mode refers to the UE ignoring the interfered subframe when measuring the wireless signal quality of the serving cellular base station according to the resource splitting condition of the interfering cellular base station. The measured wireless signal quality of the serving cellular base station, only considering the wireless signal quality of the serving cellular base station measured at the non-interfering subframe; wherein, the non-interfering subframe refers to the subframe configured for use by the serving cellular base station, and the remaining sub-frames The frame is a victim subframe.

The method further includes: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is a femtocell base station that does not allow access by the UE, and after the UE confirms entering the coverage area of the interfering cellular base station, according to The resource splitting condition of the picocell base station, and the notification that the macrocell base station sends in advance the UE changes the measurement mode after entering the coverage area of the interfering cell base station, and the UE changes the currently used conventional measurement mode to the restricted measurement mode; The conventional measurement mode refers to: The UE considers the radio signal quality of the serving cellular base station measured at each subframe.

The method further includes: after the UE confirms leaving the coverage area of the interfering cellular base station, according to a notification that the macro cellular base station sends in advance, when the UE confirms to leave the coverage area of the interfering cellular base station, the UE changes the measurement mode, and the UE uses the current usage. The limited measurement method is changed to the conventional measurement method.

The method further includes: when the serving cellular base station is a macro cellular base station, and the interfering base station is a femtocell base station that does not allow access by the UE, and after the UE confirms entering the coverage area of the interfering cellular base station, the UE receives the macro The first notification of changing the measurement mode sent by the cellular base station, and changing the currently used conventional measurement mode to the restricted measurement mode according to the first notification and the resource division of the femtocell. The method further includes: after the UE confirms the coverage area of the interfering cell base station, the UE receives a second notification of the change measurement mode sent by the macro cell base station, and uses the limited measurement mode currently used according to the second notification. Change to the conventional measurement method.

Further, the UE confirms the coverage of the interfering cellular base station by:

The UE measures that the radio signal quality of the interfering cell base station is higher than the radio signal quality of the macro cell base station by a predetermined first threshold value for a predetermined first time period;

The UE confirms the coverage of the interfering cellular base station by:

The UE measures that the radio signal quality of the interfering cellular base station is lower than a predetermined second threshold value for the radio signal quality of the macrocell base station for a predetermined second period of time.

The method further includes: when the serving cellular base station is a macro cellular base station, the interfering cellular base station is a low power node that allows the UE to access, and when the UE confirms entering the coverage area of the low power node, according to the low power node The UE switches to the low power node via the first handover command message sent by the macro cell base station; and after the handover is completed, according to the resource segmentation condition of the macro cell base station included in the first handover command message, the UE will use the conventional measurement currently used. The mode is changed to the limited measurement method.

The method further includes: after the UE confirms leaving the coverage area of the low power node, the UE switches back to the macro cell according to the second handover command message sent by the macro cell base station via the low power node, and after the handover is completed, The UE changes the currently used limited measurement mode to the conventional measurement mode.

Further, U E confirms the coverage of entering the low power node by:

The UE measures that the wireless signal quality of the low power node is higher than the wireless signal quality of the macrocell base station by a predetermined first threshold value for a predetermined first time period;

The UE confirms the coverage of leaving the low power node by:

The UE measures that the wireless signal quality of the low power node is lower than the predetermined second threshold value of the macrocell base station for a predetermined second time period. Further, the low power node is a picocellular base station or a femtocell base station that allows the UE to access.

A wireless signal quality measuring apparatus, the apparatus is located in a UE, where the apparatus is configured to: when a UE is interfered by an interfering cellular base station, use a limited measurement mode; wherein the restricted measurement mode refers to a device according to a resource of the interfering cellular base station In the case of the division, when measuring the radio signal quality of the serving cellular base station, the quality of the radio signal measured at the interfered subframe is ignored, and only the quality of the radio signal measured at the non-interfering subframe is considered; wherein, the non-interfering subframe refers to the configuration For the subframe used by the serving cellular base station, the remaining subframes are interfered subframes.

The device is further configured to: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is a femtocell base station that does not allow the UE to access, and when the device confirms entering the coverage area of the interfering cellular base station, according to the a resource splitting situation of the femtocell, and a notification sent by the macrocell base station to change the measurement mode after the device confirms entering the coverage area of the interfering cell base station, and changes the currently used conventional measurement mode to the restricted measurement mode;

Wherein, the conventional measurement mode refers to: The device considers the wireless signal quality of the serving cellular base station measured at each subframe.

The device is further configured to: after the device confirms leaving the coverage area of the interfering cell base station, according to a notification sent by the macro cell base station in advance, when the device confirms to leave the coverage area of the interfering cell base station, the measurement mode is changed, and the current use is performed. The limited measurement method is changed to the conventional measurement method.

The device is further configured to: when the serving cellular base station is a macro cellular base station, and the interfering base station is a femtocell base station that does not allow the UE to access, and when the device confirms entering the coverage area of the interfering cellular base station, receiving the macro The first notification of changing the measurement mode sent by the cellular base station, and changing the currently used conventional measurement mode to the restricted measurement mode according to the first notification and the resource division of the femtocell.

The device is further configured to: after the device confirms leaving the coverage area of the interfering cellular base station, receive a second notification of a change measurement manner sent by the macrocell base station, and according to the second notification The limited measurement method currently in use is changed to the conventional measurement method.

The device is further configured to: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is a low power node that allows the UE to which the device belongs, and the device confirms entering the coverage area of the low power node, according to the low power The node switches to the low power node via the first handover command message sent by the macro cell base station; and after the handover is completed, according to the resource segmentation condition of the macro cell base station included in the first handover command message, the current measurement mode is used. Change to restricted measurement mode.

The device is further configured to: after the device confirms leaving the coverage area of the low power node, switch back to the macro cell according to the second handover command message sent by the macro cell base station via the low power node, and after the handover is completed, Change the currently used limited measurement method to the regular measurement method.

Further, the low power node is a picocellular base station or a femtocell base station that allows a UE to which the device belongs to access.

It can be seen from the above technical solution that when the UE is interfered by the interfering cellular base station, the UE only considers the radio signal quality of the serving cellular base station measured at the non-interfering subframe (ie, the subframe configured for the serving cellular base station), Therefore, it is possible to avoid the declaration of the wrong RLF, and thus the communication between the UE and the serving cellular base station is not interrupted, thereby improving the user experience. DRAWINGS

1 is a schematic diagram of respective coverage ranges of a macrocell base station and a low power node;

2 is a schematic diagram of interference of a UE accessing a macrocell base station by a femtocell; FIG. 3 is a schematic diagram of interference of a UE accessing a picocell base station by a macrocell base station; FIG. 4 is a diagram of an interfering cellular base station and a victim cellular base station. An example of an example of resource partitioning;

5 is a schematic structural diagram of a subframe in a frequency division multiplexing (FDD) mode in an LTE system; FIG. 6 is a schematic flowchart of measuring radio signal quality according to an embodiment of the present invention; FIG. 7 is a schematic flowchart of measuring wireless signal quality according to Embodiment 2 of the present invention; FIG. 8 is a schematic flowchart of measuring wireless signal quality according to Embodiment 3 of the present invention;

9a-9b are schematic flowcharts of measuring wireless signal quality according to Embodiment 4 of the present invention; FIG. 10 is a comparison chart of RSRP of a macrocell base station and RSRP of a femtocell base station according to the present invention;

Figure 11 is a comparison diagram of RSRP of a macrocell base station and RSRP of a picocell base station according to the present invention. detailed description

The basic idea of the present invention is: When the UE is interfered to a certain degree by the interfering cellular base station, the UE ignores the service measured at the interfered subframe when measuring the radio signal quality of the serving cellular base station according to the resource partitioning condition of the interfering cellular base station. The radio signal quality of the cellular base station only considers the radio signal quality of the serving cellular base station measured at the non-interfering subframe; wherein, the non-interfering subframe refers to the subframe configured for the serving cellular base station, and the remaining subframes are interfered. frame.

The technical solution of the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

Before describing the embodiment, the two technical terms of the customization are explained first: the conventional measurement mode and the limited measurement mode; wherein, the conventional measurement mode means that the quality of the wireless signal at each subframe is likely to be measured by the UE, and The UE considers the radio signal quality of the serving cellular base station measured at each subframe, that is, the measurement method used in the prior art; the limited measurement mode refers to the UE ignoring the interferer when measuring the radio signal quality of the serving cellular base station. The wireless signal quality of the serving cellular base station measured at the frame, only the wireless signal quality of the serving cellular base station measured at the non-interfering subframe is considered.

In the following embodiments, comparing the radio signal quality of the macro cell base station and the neighboring cell base station can be implemented by comparing the reference signal received power (RSRP), or the reference signal received quality (RSRQ), and the like of the two.

The application scenarios of the first embodiment and the second embodiment are: coverage of the UE traversing the femtocell base station The process of the circumference.

Embodiment 1

In the first embodiment, the UE does not allow access to the femtocell, and the UE actively changes the measurement mode.

As shown in FIG. 6, the method for measuring wireless signal quality in Embodiment 1 includes:

Step 601: The UE receives a system message (SI, system information) broadcast by the macro cell, where the system message includes the following: a physical cell identifier (PCI, physical cell identity) reserved for the femtocell;

The system message of the macro cell base station may further include a resource splitting condition of the femtocell base station, that is, which subframes the femtocell base station uses;

The UE may receive the system message in an IDLE state or a CONNECTED state.

The resource partitioning condition of the femtocell is obtained in advance by the macrocell base station from Operation Management and Maintenance (OAM);

Step 602: When the UE accesses the macro cell base station, the UE receives a measurement configuration message sent by the macro cell base station, where the measurement configuration includes the following content: when the wireless signal quality of the neighboring cell base station is higher than that of the macro cell base station After the wireless signal quality is higher than the predetermined first threshold and continues for a predetermined first time period, the measurement event is triggered and the measurement mode is changed; when the wireless signal quality of the adjacent cellular base station is lower than the predetermined wireless signal quality of the macro cellular base station After the second threshold value continues for a predefined second time period, the leaving event is triggered and the measurement mode is changed; in this embodiment, the macro cell is the service cell;

Step 603: In the measurement process, when the measured wireless signal quality of the neighboring cellular base station is higher than the wireless signal quality of the macro cellular base station by a predetermined first threshold value for a predetermined first time period, the measurement event is triggered. And the UE reports the measurement event to the macro cell base station by sending a first measurement report; the first measurement report includes at least the neighboring cell base Station PCI;

Wherein, measuring that the wireless signal quality of the neighboring cellular base station is higher than the wireless signal quality of the macrocell base station by a predetermined first threshold value for a predetermined first time period, indicating that the UE is entering the coverage of the neighboring cellular base station, It is also a way for the UE to confirm its own coverage of the neighboring cellular base station;

As shown in FIG. 10, after the RSRP of the femtocell is greater than the RSRP-time period of the macrocell, the measurement event is triggered at point B (ie, point B in FIG. 2);

Step 604, when the UE confirms that the PCI of the neighboring cellular base station is included in the PCI received from the macrocell base station, and knows that the neighboring cellular base station is a femtocell, automatically acquires the system message of the femtocell. When it is determined that the closed subscriber group identity (CSG ID) in the system message is not included in the pre-stored list of allowed access CSG IDs, the UE learns that the femtocell does not allow itself to access. Then, the UE automatically changes the measurement mode to the limited measurement mode according to the resource segmentation situation received from the macro cell base station or obtained from the system message of the femtocell, and the measurement mode is the conventional measurement before the limited measurement mode is used. the way;

In addition, the macrocell base station learns that the neighboring cellular base station is a femtocell base station through the PCI in the first measurement report, and has not received the proximity indication sent by the UE before, the macrocell base station knows that the UE does not allow Accessing the femtocell, the macrocell base station scheduling the UE on a subframe that is not used by the femtocell;

Step 605: After detecting that the wireless signal quality of the femtocell is lower than the predetermined second threshold of the macrocell base station and continues for a predefined second period of time, triggering the leaving event, the UE sends the first The second measurement report reports the leaving event to the macrocell base station, and automatically changes the measurement mode to start using the conventional measurement mode. Specifically, the radio signal quality at each subframe is likely to be measured by the UE.

Measuring the wireless signal quality of the femtocell base station compared to the wireless signal quality of the macrocell base station A second time period below the predetermined second threshold and continuing for a predetermined period of time indicates that the UE is leaving the coverage of the femtocell; this is also one way for the UE to confirm its departure from the coverage of the femtocell.

As shown in Figure 10, the exit event is triggered at point C (i.e., point C in Figure 2).

Embodiment 2

In the second embodiment, the UE does not allow access to the femtocell, and the macrocell controls the UE to change the measurement mode.

As shown in FIG. 7, the method for measuring wireless signal quality in Embodiment 2 includes:

Step 701: When the UE accesses the macro cell base station, the UE receives the measurement configuration message sent by the macro cell base station. The content of the measurement configuration includes: when the radio signal quality of the neighboring cell base station is higher than the radio signal quality of the macro cell base station. a first threshold value and continuing for a predetermined first time period, triggering a measurement event; when a wireless signal quality of a neighboring cellular base station is lower than a predetermined second threshold value of the macro cellular base station and continuing to be predefined After the second period of time, the exit event is triggered;

The measurement configuration message in the second embodiment is different from that in the first embodiment. Because the measurement configuration content in the two messages is different, in the first embodiment, the serving cellular base station needs to tell the UE about the trigger condition of the measurement mode change. It may also include the case of resource segmentation of the femto cell, and the decision to change the measurement mode in the embodiment is performed by the serving cellular base station, so the measurement configuration message in the second embodiment is only a common measurement configuration message;

Step 702: After measuring that the wireless signal quality of the neighboring cellular base station is higher than the wireless signal quality of the macro cellular base station by a predetermined first threshold value for a predetermined first time period, the measurement event is triggered, and the UE sends the first a measurement report is reported to the macro cell base station; the first measurement report includes at least the PCI of the neighboring cell base station;

Step 703: The macro cell base station learns that the neighboring cell base station is a femto cell base station by using the PCI in the first measurement report, and does not receive the proximity indication sent by the UE before, the macro cell base station learns The UE does not allow access to the femtocell, and the macrocell base station notifies the UE to change the measurement mode by sending dedicated signaling, such as a first RRC connection reconfiguration message, to the UE, the first RRC connection. The reconfiguration message may further include a resource splitting condition of the femtocell base station;

Step 704: The UE changes the measurement mode according to the received resource splitting condition of the femtocell, and starts to use the limited measurement mode. Specifically, the UE ignores the wireless measured at the subframe used by the femtocell. Signal quality;

Step 705: When the wireless signal quality of the femtocell is measured to be lower than the predetermined second threshold, the UE triggers the leaving event, and the UE reports the leaving event by sending the second measurement report. Giving a macro cell base station;

Step 706: After receiving the second measurement report and continuing for a predetermined second time period, the macro cell base station learns that the UE is about to leave the femtocell, and notifies the UE by sending dedicated signaling, such as a second RRC connection reconfiguration message, to the UE. Change the measurement method;

Step 707: After receiving the second RRC connection reconfiguration message, the UE changes the measurement mode and starts to use the regular measurement mode.

After the macro cell base station receives the first measurement report, before transmitting the first RRC connection reconfiguration message, if the macro cell base station needs to further confirm whether the femtocell base station does not allow the UE to access, the system message (SI is sent to the UE) Obtaining a message to request the UE to acquire the SI of the femtocell, and the UE sends the obtained SI of the femtocell to the macrocell, and the macrocell knows that the femtocell does not allow according to the SI of the femtocell. UE access.

Embodiment 3

In the third embodiment, the UE allows access to the femtocell. As shown in FIG. 8, the method for measuring wireless signal quality in Embodiment 3 includes:

Step 801: When the UE accesses the macro cell base station, the UE receives the measurement sent by the macro cell base station. a configuration message, where the measurement configuration message is a normal measurement configuration message;

Step 802: When the UE is close to the femtocell that allows itself to access, according to the femto cell that has been recorded by itself, it can be known that the femtocell base station allows itself to access, and then sends a proximity indication to the macro cell;

Step 803: After measuring that the wireless signal quality of the femto cell is higher than a wireless signal quality of the macro cell base station by a predetermined first threshold value for a predetermined first time period, triggering a measurement event, and the UE sends the first The measurement report reports the measurement event to the macrocell base station; the first measurement report includes the PCI of the femtocell;

Step 804: The macro cell base station learns that the neighboring cell base station is a femto cell base station by using the PCI in the first measurement report, and also receives the proximity indication sent by the UE, and the macro cell base station learns that the UE can access the femto. a cellular base station, wherein the macro cellular base station sends a first handover request message to the femto cell;

After the macrocell base station receives the first measurement report, if the macrocell base station needs to further confirm whether the femtocell base station allows the UE to access, it sends a system message acquisition (SI) message to the UE to request the UE to acquire the femtocell base station. SI, the UE sends the obtained SI of the femtocell to the macrocell, and the macrocell knows that the UE does allow access to the femtocell according to the SI of the femtocell;

Step 805: After receiving the first handover request message, the femto cell sends a first handover command message to the UE to notify the UE to perform handover by using the macro cell, where the first handover command message includes the resource division of the macro cell, that is, the Which subframes are used by the macro cell;

The resource segmentation of the macro cell may be added by the macro cell or the femto cell in the first handover command message; the femto cell obtains the resource segmentation of the macro cell from the OAM in advance;

Step 806: The UE disconnects from the macro cell and accesses the femto cell according to the received first handover command message, and sends a first handover complete message to the femto cell; after the handover is completed, The UE changes the measurement mode to the restricted measurement mode according to the resource segmentation condition of the macro cell, that is, the UE ignores the quality of the wireless signal measured at the subframe used by the macro cell.

After the UE switches to the femto cell, the femto cell becomes the serving cell, and the macro cell becomes the interfering cellular base station.

When the UE leaves the coverage of the femto cell, the method of measuring the wireless signal is similar to the steps 906 to 909 described later, and therefore will not be described herein.

Embodiment 4

When the UE is close to the coverage of the pico cell, as shown in FIG. 9a, the method for measuring the quality of the wireless signal in the fourth embodiment includes:

Step 901: When the UE accesses the macro cell base station, the UE receives the measurement configuration message sent by the macro cell base station, where the measurement configuration message is a common measurement configuration message.

Step 902: After measuring that the wireless signal quality of the neighboring cellular base station is higher than the wireless signal quality of the macro cellular base station by a predetermined first threshold value for a predetermined first time period, the measurement event is triggered, and the UE sends the first A measurement report reports the measurement event to the macrocell base station;

As shown in Figure 11, the measurement event is triggered at point B (ie, point B in Figure 3);

Step 903: According to the received first measurement report, the macro cell learns that the neighboring cell is a pico cell. Since each UE is allowed to access the pico cell, the UE can switch from the macro cell to the pico cell, when the macro cell determines When the UE is switched to the picocell, the macro cell sends a first handover request message to the pico cell.

Step 904: After receiving the first handover request message, according to the configuration of the OAM, the pico cell learns that it is located in the coverage of the macro cell, and sends a first handover command message to the UE to notify the UE by using the macro cell. And performing the handover, where the first handover command message includes the resource division of the macro cell, that is, which subframes are used by the macro cell; wherein the resource segmentation of the macro cell may be added by the macro cell or the pico cell. Switching command message; pico cell obtains resource partitioning of macro cell from OAM in advance Situation

Step 905: The UE disconnects from the macro cell and accesses the pico cell according to the received first handover command message, and sends a first handover complete message to the pico cell. After the handover is completed, the UE according to the macro cell The resource partitioning situation, changing the measurement mode, starts to use the limited measurement mode, that is, the UE ignores the quality of the wireless signal measured at the subframe used by the macro cell.

When the UE switches to the pico cell, the pico cell becomes the monthly service cell, and the macro cell becomes the interfering cellular base station.

As shown in FIG. 9b, when the UE leaves the coverage of the pico cell, the method for measuring the quality of the radio signal in the fourth embodiment includes:

Step 906: After detecting that the wireless signal quality of the pico cell is lower than the predetermined second threshold value and the predetermined second time period is continued for a predetermined second time period, the leaving event is triggered, and the UE sends the second measurement report. Reporting the departure event to the pico cell;

As shown in FIG. 11, at point C (ie, point C in FIG. 3), when the RSRP of the picocell base station is smaller than the RSRP of the macrocell base station, the leaving event is triggered;

Step 907: According to the received second measurement report, the pico cell learns that the UE is about to leave its coverage, and needs to switch back to the macro cell, and the pico cell sends a second handover request message to the macro cell.

Step 908: The macro cell sends a second handover command message to the UE by using the pico cell according to the received second handover request message.

Step 909: The UE disconnects from the pico cell and accesses the macro cell according to the received second handover command message, and sends a second handover complete message to the macro cell. After the handover is completed, the UE changes the measurement mode, and starts to use the regular The measurement method, specifically, the quality of the wireless signal measured at each sub-frame is considered.

After the UE switches back to the macro cell, the macro cell becomes the moon again. In addition, in a practical application, if the UE needs to make a call or a called call in the pico cell, the pico cell also needs to send a message to the UE to notify the UE of the resource segmentation of the interference cell, that is, the macro cell. Enable the UE to use the limited measurement mode immediately. The message may be an RRC connection reconfiguration message, which includes a resource partitioning situation of the macro cell.

Correspondingly, the present invention also provides a wireless signal quality measuring apparatus, which is located in a UE, and is configured to: when a UE is interfered by an interfering cellular base station, use a limited measurement mode.

The device is further configured to: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is a femtocell base station that does not allow the UE to access, and when the device confirms entering the coverage area of the interfering cellular base station, according to the The resource splitting condition of the femtocell base station, and the notification sent by the macrocell base station to change the measurement mode after the device confirms the coverage area of the interfering cell base station, and changes the currently used conventional measurement mode to the limited measurement mode.

The device is further configured to: after the device confirms to leave the coverage area of the interfering cell base station, receive a second notification of changing the measurement mode sent by the macro cell base station, and use the limited measurement mode currently used according to the second notification Change to the conventional measurement method.

The device is further configured to: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is a low power node that allows the UE to which the device belongs to access, and the device confirms entering the low power node. After the coverage area of the point, according to the first handover command message sent by the low power node via the macro cell base station, switching to the low power node; and after the handover is completed, according to the resources of the macro cell base station included in the first handover command message Split the situation and change the currently used general measurement mode to the limited measurement mode.

The low power node is a picocell base station or a femtocell base station that allows a UE to which the device belongs to access.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for measuring a radio signal quality, the method comprising: when a user equipment UE is interfered by an interfering cellular base station, the UE uses a limited measurement mode; wherein the restricted measurement mode refers to the UE according to the interfering cellular base station The resource partitioning situation, when measuring the wireless signal quality of the serving cellular base station, ignoring the wireless signal quality of the serving cellular base station measured at the interfered subframe, and only considering the wireless signal of the serving cellular base station measured at the non-interfering subframe Quality; where, the non-interfering subframe refers to a subframe configured for use by the serving cellular base station, and the remaining subframes are interfered subframes.

2. The method for measuring radio signal quality according to claim 1, wherein the method further comprises: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is a femtocell that does not allow access by the UE. At the time of the base station, and after the UE confirms the coverage of the coverage area of the interfering cellular base station, according to the resource partitioning situation of the femtocell, and the pre-sentence of the macrocell base station, the measurement is changed after the UE confirms the coverage area of the interfering cellular base station. In the manner of notification, the UE changes the currently used conventional measurement mode to the limited measurement mode;

Wherein, the conventional measurement mode refers to: the UE considers the radio signal quality of the serving cellular base station measured at each subframe.

The method for measuring radio signal quality according to claim 2, wherein the method further comprises: when the UE confirms leaving the coverage area of the interfering cellular base station, the UE is pre-transmitted according to the macro cellular base station. After confirming that the measurement mode is changed after leaving the coverage area of the interfering cell base station, the UE changes the currently used limited measurement mode to the conventional measurement mode.

The method for measuring a wireless signal quality according to claim 1, wherein the method further comprises: when the serving cellular base station is a macro cellular base station, and the interfering base station is a femtocell base station that does not allow access by the UE. And, when the UE confirms the coverage of the coverage area of the interfering cellular base station, the UE receives the first notification of the change measurement mode sent by the macro cellular base station, And according to the first notification and the resource division of the femtocell, the conventional measurement mode currently used is changed to the limited measurement mode.

The method for measuring radio signal quality according to claim 4, wherein the method further comprises: after the UE confirms that the coverage area of the interfering cell base station is removed, the UE receives the change measurement sent by the macro cell base station. The second notification of the mode, and according to the second notification, the currently used limited measurement mode is changed to the conventional measurement mode.

The method for measuring radio signal quality according to claim 3 or 5, wherein the UE confirms the coverage of the interfering cellular base station by:

The UE confirms the coverage of the interfering cellular base station by:

The method for measuring a wireless signal quality according to claim 1, wherein the method further comprises: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is a low power node that allows the UE to access And after the UE confirms entering the coverage area of the low-power node, the UE switches to the low-power node according to the first handover command message sent by the low-power node via the macro-cell base station; and after the handover is completed, according to the first handover The resource splitting of the macrocell base station included in the command message, the UE changes the currently used conventional measurement mode to the restricted measurement mode.

8. The method for measuring radio signal quality according to 7, wherein the method further comprises: after the UE confirms leaving the coverage area of the low power node, according to the macro cell base station transmitting the low power node. The second handover command message, the UE switches back to the macro cell, and after the handover is completed, the UE changes the currently used limited measurement mode to the regular measurement mode.

9. The method of measuring wireless signal quality according to claim 8, wherein: The UE confirms the coverage of entering the low power node by:

The UE confirms the coverage of leaving the low power node by:

The UE measures that the wireless signal quality of the low power node is lower than the predetermined second threshold value of the macrocell base station for a predetermined second time period.

10. A method of measuring radio signal quality according to claim 7, 8 or 9, wherein said low power node is a picocell base station or a femtocell base station allowing said UE to access.

A radio signal quality measuring apparatus, wherein the apparatus is located in a UE, where the apparatus is configured to: when the UE is interfered by the interfering cellular base station, use a limited measurement mode; wherein the limited measurement mode refers to the device According to the resource segmentation condition of the interfering cell base station, when measuring the radio signal quality of the serving cell site, the quality of the radio signal measured at the interfered subframe is ignored, and only the radio signal quality measured at the non-interfering subframe is considered; The non-interfering subframe refers to a subframe configured for use by the serving cellular base station, and the remaining subframes are interfered subframes.

The apparatus for measuring radio signal quality according to claim 11, wherein the apparatus is further configured to: when the serving cellular base station is a macro cellular base station, and the interfering cellular base station is not allowed to access the UE When the picocell base station, and after the device confirms the coverage area of the interfering cell base station, according to the resource partitioning condition of the femtocell base station, and the pre-sent by the macrocell base station, when the device confirms the coverage area of the interfering cell base station Change the notification of the measurement mode and change the currently used general measurement mode to the limited measurement mode;

The method for measuring wireless signal quality according to claim 12, wherein the device is further configured to: after the device confirms that the coverage area of the interfering cellular base station is removed, According to the notification sent by the macrocell base station in advance to change the measurement mode after the device confirms the coverage of the coverage area of the interfering cellular base station, the currently used limited measurement mode is changed to the conventional measurement mode.

The apparatus for measuring wireless signal quality according to claim 11, wherein the apparatus is further configured to: when the serving cellular base station is a macro cellular base station, the interfering base station is a femtocell that does not allow access by the UE At the time of the base station, and after the device confirms the coverage of the coverage area of the interfering cellular base station, receiving the first notification of the change measurement mode sent by the macro cell base station, and according to the first notification and the resource division of the femtocell, The conventional measurement method currently in use is changed to the limited measurement method.

The apparatus for measuring radio signal quality according to claim 14, wherein the apparatus is further configured to: when the apparatus confirms that the coverage area of the interfering cell base station is removed, receive a change measurement manner sent by the macro cell base station The second notification, and according to the second notification, the currently used limited measurement mode is changed to the conventional measurement mode.

The apparatus for measuring wireless signal quality according to claim 11, wherein the apparatus is further configured to: when the serving cellular base station is a macro cellular base station, the interfering cellular base station is a low power that allows the UE to which the device belongs to access And when the device confirms entering the coverage area of the low-power node, switching to the low-power node according to the first handover command message sent by the low-power node via the macro-cell base station; and after the handover is completed, according to the first handover The resource segmentation of the macrocell base station included in the command message changes the conventional measurement mode currently used to the restricted measurement mode.

The apparatus for measuring radio signal quality according to claim 16, wherein the apparatus is further configured to: after the apparatus confirms leaving the coverage area of the low power node, according to the macro cell base station transmitting via the low power node; The incoming second handover command message is switched back to the macro cell, and after the handover is completed, the currently used limited measurement mode is changed to the regular measurement mode.

The wireless signal quality measuring apparatus according to claim 16 or 17, wherein the low power node is a picocellular base station or allows a UE to which the device belongs Into the femtocell,