WO2012040940A1 - 无线信号质量的测量方法及装置 - Google Patents
无线信号质量的测量方法及装置 Download PDFInfo
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- WO2012040940A1 WO2012040940A1 PCT/CN2010/077548 CN2010077548W WO2012040940A1 WO 2012040940 A1 WO2012040940 A1 WO 2012040940A1 CN 2010077548 W CN2010077548 W CN 2010077548W WO 2012040940 A1 WO2012040940 A1 WO 2012040940A1
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- base station
- signal quality
- cellular base
- measurement mode
- interfering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Definitions
- the present invention relates to signal measurement techniques, and more particularly to a method and apparatus for measuring wireless signal quality. Background technique
- FIG. 1 is a schematic diagram of respective coverage areas of a macrocell macrocell and a low power node.
- a macrocell base station 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.
- UE mobile user equipment
- 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.
- 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.
- 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.
- the femtocell base station operates in an uncoordinated manner.
- 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.
- a UE accessing a picocell base station is interfered by a macrocell base station.
- the PUE is close to the coverage of the picocell.
- 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.
- 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
- the victim cellular base station (victim) refers to a cell that is interfered by other cellular base stations.
- LTE Long Term Evolution
- 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 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.
- 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).
- 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.
- RE resource element
- 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.
- MBMS multimedia broadcast multicast service
- 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.
- 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.
- 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.
- 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.
- RRC Radio Resource Control
- 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.
- a method of measuring wireless signal quality including:
- 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.
- 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.
- 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.
- 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;
- 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.
- 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.
- the UE 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.
- the non-interfering subframe ie, the subframe configured for the serving cellular base station
- 1 is a schematic diagram of respective coverage ranges of a macrocell base station and a low power node
- FIG. 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.
- FIG. 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
- 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 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.
- 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.
- RSRP reference signal received power
- RSRQ reference signal received quality
- 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.
- the UE does not allow access to the femtocell, and the UE actively changes the measurement mode.
- 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;
- SI system information
- PCI physical cell identifier
- 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;
- 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.
- 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;
- 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.
- the exit event is triggered at point C (i.e., point C in Figure 2).
- the UE does not allow access to the femtocell, and the macrocell controls the UE to change the measurement mode.
- 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.
- 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.
- the UE allows access to the femtocell.
- 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;
- the macrocell base station 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;
- SI system message acquisition
- 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.
- the femto cell becomes the serving cell, and the macro cell becomes the interfering cellular base station.
- the method of measuring the wireless signal is similar to the steps 906 to 909 described later, and therefore will not be described herein.
- 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;
- 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 pico cell becomes the monthly service cell
- the macro cell becomes the interfering cellular base station.
- 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;
- 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.
- the pico cell After the UE switches back to the macro cell, the macro cell becomes the moon again.
- 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.
- 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 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 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 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.
- 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.
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Abstract
本发明公开了一种无线信号质量的测量方法及装置。该方法包括：当UE受到干扰蜂窝基站的干扰时，UE使用受限测量方式；其中，受限测量方式指UE根据干扰蜂窝基站的资源分割情况，在测量服务蜂窝基站的无线信号质量时，忽略受干扰子帧处测量到的无线信号质量，仅考虑在非干扰子帧处测量到的无线信号质量；其中，非干扰子帧指配置给服务蜂窝基站使用的子帧，其余子帧为受干扰子帧。采用本发明能够避免宣告错误的无线链路失败。
Description
无线信号质量的测量方法及装置 技术领域
本发明涉及信号测量技术， 尤其涉及一种无线信号质量的测量方法及 装置。 背景技术
随着无线通信系统的发展， 网络拓朴结构变得越来越复杂。 一种趋势 是同构网络与具有较小覆盖范围的蜂窝基站共存， 如微蜂窝基站 （micro cell )、 微微蜂窝基站（ pico cell )和毫微微蜂窝基站（ femto cell )。 这样一来 整个网络就变成了异构网络。 为了简化描述， 可以将这些具有较小覆盖范 围的蜂窝基站统称为低功率节点（LPN, low power node )„ 图 1为宏蜂窝基 站（macro cell )与低功率节点各自的覆盖范围示意图。
当宏蜂窝基站和 LPN属于不同的频率层时， 最重要的问题是移动性管 理。 通常， 运营商使高速移动的用户设备（UE )在宏蜂窝基站中停留和移 动； 如果低功率节点的覆盖范围对低速移动的 UE是可用的，则使低速移动 的 UE在低功率节点中停留和移动。 有时宏蜂窝基站也称为伞型蜂窝基站 ( umbrella cell )。
当宏蜂窝基站和 LPN 属于相同的频率层时， 则会出现同频干扰 ( co-channel interference )这一问题。 这是因为： 通常 LPN是用来增加容量 而不是扩大覆盖范围的。 因此这些 LPN位于宏蜂窝基站的覆盖范围内。 而 当 UE接入宏蜂窝基站时， 会受到 LPN的下行链路的干扰， 如受到不允许 该 UE接入的毫微微蜂窝基站的下行链路的干扰。
同频干扰存在两种典型的干扰场景。 第一种场景是接入宏蜂窝基站的 UE (称为 MUE )受到毫微微蜂窝基站的干扰。 毫微微蜂窝基站仅使经认证
过的少数 UE接入。 并且毫微微蜂窝基站以非协调方式运营。 如图 2所示， 当 MUE穿越不允许自身接入的毫微微蜂窝基站的覆盖范围的过程中，即使 毫微微蜂窝基站的无线信号质量很好，但由于 MUE不允许接入该毫微微蜂 窝基站， 所以 MUE的下行链路会受到该毫微微蜂窝基站的干扰。
另一种场景是接入微微蜂窝基站的 UE (称为 PUE )受到宏蜂窝基站的 干扰。 如图 3所示， PUE接近微微蜂窝基站的覆盖范围， 当一个测量事件 被触发， 且 PUE向宏蜂窝基站发送测量报告后， 宏蜂窝基站得知该微微蜂 窝基站的无线信号质量不错。 由于 UE 都允许接入微微蜂窝基站， 所以当 PUE靠近该微微蜂窝基站时， PUE与宏蜂窝基站断开连接而接入微微蜂窝 基站。 由于微微蜂窝基站的部分或全部位于宏蜂窝基站中， 所以 PUE的下 行链路会受到宏蜂窝基站的干扰。
目前， 解决同频干扰这一问题的一种方法是在宏蜂窝基站和毫微微蜂 窝基站之间、 或宏蜂窝基站和微微蜂窝基站之间进行资源分割， 即干扰蜂 窝基站暂时减少使用或者停用无线资源的一部分， 而让受干扰蜂窝基站在 这些时间段工作。 其中， 干扰蜂窝基站（aggressor )是指干扰其他蜂窝基站 的 cell, 受干扰蜂窝基站（victim )是指受到其他蜂窝基站干扰的 cell。 在 长期演进（LTE ) 系统中， 一个无线帧由十个 1ms的子帧组成。 通常 LTE 系统的资源粒度在时域上也是一个子帧。 因此在资源分割时可以将子帧作 为资源分割的单位。 图 4示出了资源分割的一个实例， 如图 4所示， 编号 为偶数的子帧配置给干扰蜂窝基站， 即干扰蜂窝基站减少或者停止使用标 号为奇数的子帧， 而编号为奇数的子帧配置给受干扰蜂窝基站使用。 其中， 配置给受干扰蜂窝基站 （一般是服务蜂窝基站）使用的子帧称为非干扰子 帧， 其他的子帧称为受干扰子帧。
一个子帧由数个符号如 14个符号组成， 如图 5所示。 通常， 前几个符 号如 1~3 个符号由物理层控制信令使用； 其余的符号中， 除了一些参考信
号比如小区专用的参考信号（ CRS , cell-specific reference )使用的之外， 由 数据使用。 在图 5中， 每个小方格代表一个资源元素（RE ), 该资源元素由 时域上的一个符号和频域上的一个子载波确定。 对于控制信令或数据， 一 个 RE可以负载一个符号。
目前， 一种配置非干扰子帧的方法是： 可以将被非干扰子帧配置为多 媒体广播多播业务（MBMS )子帧， 即对由物理控制信令使用的前几个符 号不作任何处理， 而将其余的符号全部空出来， 包括原来应由数据和 CRS 使用的符号全部空出来。 另一种方法是： 在整个子帧中， 仅对由 CRS使用 的符号不做处理， 其余的符号全部空出来。
如果受干扰蜂窝基站使用这些非干扰子帧， 则同频干扰的问题似乎得 到了解决。 但是这会引起错误的无线链路失败（RLF, radio link failure )„ 在 LTE系统中，UE通过每 10ms测量服务蜂窝基站的 CRS来监测下行链路 的无线信号质量， 因此每个子帧都有可能被 UE在物理层测量到。如果在预 定时间内服务蜂窝基站的无线信号质量一直比预定门限 Qout差， 则 UE宣 告无线链路失败； 除非在 UE宣告之前，服务蜂窝基站的无线信号质量在预 定时间内变得比预定门限 Qin好，则 UE不再宣告。如果在受干扰蜂窝基站 使用非干 4尤子帧后， 仍不改变该无线链路监测 （RLM, radio link monitor ) 方式， 则 UE可能会宣告错误的 RLF, 原因是： UE会测量到那些干扰蜂窝 基站和受干扰蜂窝基站共同使用的受干扰子帧， 因此在这些受干扰子帧中 会监测到无线信号质量很差， 进而宣告 RLF; 但是， 由于釆用了资源分割， 用户面的通信仍然是正常的， 因此该 RLF是错误的。另外， 当宣告 RLF时， UE与无线链路断开连接， 并重新建立无线资源控制 （RRC )连接， 这将中 断 UE和服务蜂窝基站正在进行的通信。 发明内容
有鉴于此， 本发明的主要目的在于提供一种无线信号质量的测量方法
及装置， 能够避免 UE宣告错误的 RLF。
为达到上述目的， 本发明的技术方案是这样实现的：
一种无线信号质量的测量方法， 包括：
当 UE受到干扰蜂窝基站的干扰时， UE使用受限测量方式； 其中， 受限测量方式指 UE根据干扰蜂窝基站的资源分割情况， 在测量服务蜂 窝基站的无线信号质量时， 忽略受干扰子帧处测量到的服务蜂窝基站的 无线信号质量， 仅考虑在非干扰子帧处测量到的服务蜂窝基站的无线信 号质量； 其中， 非干扰子帧指配置给服务蜂窝基站使用的子帧， 其余子 帧为受干扰子帧。
所述方法还包括： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为 不允许所述 UE接入的毫微微蜂窝基站时， 且当 UE确认进入该干扰蜂 窝基站的覆盖区范围后， 根据毫微微蜂窝基站的资源分割情况， 以及宏 蜂窝基站预先发来的当 UE确认进入干扰蜂窝基站的覆盖区范围后改变 测量方式的通知， UE将当前使用的常规测量方式改为受限测量方式； 其中， 常规测量方式指： UE 考虑在每个子帧处测量到的服务蜂窝 基站的无线信号质量。
所述方法还包括： 当 UE确认离开该干扰蜂窝基站的覆盖区范围后， 根据宏蜂窝基站预先发来的当 UE确认离开干扰蜂窝基站的覆盖区范围 后改变测量方式的通知， UE 将当前使用的受限测量方式改为常规测量 方式。
所述方法还包括： 当服务蜂窝基站为宏蜂窝基站， 干扰基站为不允 许所述 UE接入的毫微微蜂窝基站时， 且当 UE确认进入该干扰蜂窝基 站的覆盖区范围后， UE 接收宏蜂窝基站发来的改变测量方式的第一通 知， 并根据该第一通知和毫微微蜂窝基站的资源分割情况， 将当前使用 的常规测量方式改为受限测量方式。
所述方法还包括： 当 UE确认离开该干扰蜂窝基站的覆盖区范围后， UE 接收宏蜂窝基站发来的改变测量方式的第二通知， 并根据该第二通 知将当前使用的受限测量方式改为常规测量方式。
进一步地， UE通过以下方式确认进入干扰蜂窝基站的覆盖范围：
UE 测量到所述干扰蜂窝基站的无线信号质量比宏蜂窝基站的无线 信号质量高出预定的第一门限值且持续预定的第一时间段；
UE通过以下方式确认离开干扰蜂窝基站的覆盖范围：
UE 测量到所述干扰蜂窝基站的无线信号质量比宏蜂窝基站的无线 信号质量低于预定的第二门限值且持续预定的第二时间段。
所述方法还包括： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为 允许所述 UE接入的低功率节点时， 且当 UE确认进入该低功率节点的 覆盖区范围后， 根据低功率节点经由宏蜂窝基站发来的第一切换命令消 息， UE 切换到低功率节点； 且在切换完成后， 根据第一切换命令消息 中包含的宏蜂窝基站的资源分割情况， UE 将当前使用的常规测量方式 改为受限测量方式。
所述方法还包括： 当 UE确认离开该低功率节点的覆盖区范围后， 根据宏蜂窝基站经由低功率节点发来的第二切换命令消息， UE 切换回 宏蜂窝小区， 且在切换完成后， UE 将当前使用的受限测量方式改为常 规测量方式。
进一步地， U E通过以下方式确认进入低功率节点的覆盖范围：
UE 测量到所述低功率节点的无线信号质量比宏蜂窝基站的无线信 号质量高出预定的第一门限值且持续预定的第一时间段；
UE通过以下方式确认离开低功率节点的覆盖范围：
UE 测量到所述低功率节点的无线信号质量比宏蜂窝基站的无线信 号质量低于预定的第二门限值且持续预定的第二时间段。
进一步地， 所述低功率节点为微微蜂窝基站或允许所述 UE接入的 毫微微蜂窝基站。
一种无线信号质量的测量装置， 该装置位于 UE 中， 该装置用于： 当 UE受到干扰蜂窝基站的干扰时， 使用受限测量方式； 其中， 受限测 量方式指装置根据干扰蜂窝基站的资源分割情况， 在测量服务蜂窝基站 的无线信号质量时， 忽略受干扰子帧处测量到的无线信号质量， 仅考虑 在非干扰子帧处测量到的无线信号质量； 其中， 非干扰子帧指配置给服 务蜂窝基站使用的子帧， 其余子帧为受干扰子帧。
所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为 不允许所述 UE接入的毫微微蜂窝基站时， 且当装置确认进入该干扰蜂 窝基站的覆盖区范围后， 根据毫微微蜂窝基站的资源分割情况， 以及宏 蜂窝基站预先发来的当装置确认进入干扰蜂窝基站的覆盖区范围后改变 测量方式的通知， 将当前使用的常规测量方式改为受限测量方式；
其中， 常规测量方式指： 装置考虑在每个子帧处测量到的服务蜂窝 基站的无线信号质量。
所述装置还用于：当装置确认离开该干扰蜂窝基站的覆盖区范围后， 根据宏蜂窝基站预先发来的当装置确认离开干扰蜂窝基站的覆盖区范围 后改变测量方式的通知，将当前使用的受限测量方式改为常规测量方式。
所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰基站为不允 许所述 UE接入的毫微微蜂窝基站时， 且当装置确认进入该干扰蜂窝基 站的覆盖区范围后， 接收宏蜂窝基站发来的改变测量方式的第一通知， 并根据该第一通知和毫微微蜂窝基站的资源分割情况， 将当前使用的常 规测量方式改为受限测量方式。
所述装置还用于：当装置确认离开该干扰蜂窝基站的覆盖区范围后， 接收宏蜂窝基站发来的改变测量方式的第二通知， 并根据该第二通知将
当前使用的受限测量方式改为常规测量方式。
所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为 允许装置所属的 UE接入的低功率节点时， 且装置确认进入该低功率节 点的覆盖区范围后， 根据低功率节点经由宏蜂窝基站发来的第一切换命 令消息， 切换到低功率节点； 且在切换完成后， 根据第一切换命令消息 中包含的宏蜂窝基站的资源分割情况， 将当前使用的常规测量方式改为 受限测量方式。
所述装置还用于： 当装置确认离开该低功率节点的覆盖区范围后， 根据宏蜂窝基站经由低功率节点发来的第二切换命令消息， 切换回宏蜂 窝小区， 且在切换完成后， 将当前使用的受限测量方式改为常规测量方 式。
进一步地， 所述低功率节点为微微蜂窝基站或允许所述装置所属的 UE接入的毫微微蜂窝基站。
由以上技术方案可以看出， 当 UE受到干扰蜂窝基站的干扰时， UE仅 考虑在非干扰子帧 （即配置给服务蜂窝基站使用的子帧）处测量到的服务 蜂窝基站的无线信号质量， 因此能够避免宣告错误的 RLF, 也就不会中断 UE和服务蜂窝基站正在进行的通信， 从而改善用户体验。 附图说明
图 1为宏蜂窝基站与低功率节点各自的覆盖范围示意图；
图 2为接入宏蜂窝基站的 UE受到毫微微蜂窝基站的干扰示意图； 图 3为接入微微蜂窝基站的 UE受到宏蜂窝基站的干扰示意图； 图 4为在干扰蜂窝基站和受干扰蜂窝基站之间进行资源分割的一个实 例示意图；
图 5为 LTE系统中频分复用 （FDD )模式下子帧的结构示意图； 图 6为本发明实施例一测量无线信号质量的流程示意图；
图 7为本发明实施例二测量无线信号质量的流程示意图； 图 8为本发明实施例三测量无线信号质量的流程示意图；
图 9a~9b为本发明实施例四测量无线信号质量的流程示意图； 图 10为本发明宏蜂窝基站的 RSRP与毫微微蜂窝基站的 RSRP的比较 曲线图；
图 11为本发明宏蜂窝基站的 RSRP与微微蜂窝基站的 RSRP的比较曲 线图。 具体实施方式
本发明的基本思想是： 当 UE 受到干扰蜂窝基站一定程度的干扰时， UE根据干扰蜂窝基站的资源分割情况， 在测量服务蜂窝基站的无线信号质 量时， 忽略受干扰子帧处测量到的服务蜂窝基站的无线信号质量， 仅考虑 在非干扰子帧处测量到的服务蜂窝基站的无线信号质量； 其中， 非干扰子 帧指配置给服务蜂窝基站使用的子帧， 其余子帧为受干扰子帧。
下面结合实施例和附图对本发明的技术方案作进一步详细说明。
在描述实施例前， 先解释一下自定义的两个技术术语： 常规测量方式 和受限测量方式； 其中， 常规测量方式是指每个子帧处的无线信号质量都 有可能被 UE测量到，且 UE考虑在每个子帧处测量到的服务蜂窝基站的无 线信号质量， 即现有技术釆用的测量方式； 受限测量方式是指在测量服务 蜂窝基站的无线信号质量时， UE忽略受干扰子帧处测量到的服务蜂窝基站 的无线信号质量， 仅考虑在非干扰子帧处测量到的服务蜂窝基站的无线信 号质量。
在以下实施例中， 比较宏蜂窝基站与相邻蜂窝基站的无线信号质量， 可以通过比较两者的参考信号接收功率 （RSRP )、 或参考信号接收质量 ( RSRQ )等实现。
实施例一和实施例二的应用场景是： UE穿越毫微微蜂窝基站的覆盖范
围的过程。
实施例一
在实施例一中， UE不允许接入毫微微蜂窝基站， 且 UE主动改变测量 方式。
如图 6所示， 实施例一中测量无线信号质量的方法包括：
步骤 601 , UE收到宏蜂窝基站广播的系统消息（ SI, system information ), 该系统消息中包含以下内容：预留给毫微微蜂窝基站的物理小区标识（ PCI, physical cell identity );
宏蜂窝基站的系统消息中还可以包括毫微微蜂窝基站的资源分割情 况， 即毫微微蜂窝基站使用哪些子帧；
其中， UE可以在空闲态（ IDLE state )或连接态（ CONNECTED state ) 接收该系统消息；
毫微微蜂窝基站的资源分割情况由宏蜂窝基站预先从操作管理维护 ( OAM )获得；
步骤 602, 当 UE接入宏蜂窝基站时， UE接收宏蜂窝基站发来的测量 配置 ( measurement configuration ) 消息 , 该测量配置包含有以下内容： 当 相邻蜂窝基站的无线信号质量比宏蜂窝基站的无线信号质量高出预定的第 一门限值且持续预定的第一时间段后， 触发测量事件并改变测量方式； 当 相邻蜂窝基站的无线信号质量比宏蜂窝基站的无线信号质量低于预定的第 二门限值且持续预定义的第二时间段后， 触发离开事件并改变测量方式； 本实施例中， macro cell即是服务 cell;
步骤 603 , 在测量过程中， 当测量到相邻蜂窝基站的无线信号质量比宏 蜂窝基站的无线信号质量高出预定的第一门限值且持续预定的第一时间段 后， 触发测量事件， 且 UE通过发送第一测量报告（measurement report )将 该测量事件上报给宏蜂窝基站； 第一测量报告中至少包含有该相邻蜂窝基
站的 PCI;
其中， 测量到相邻蜂窝基站的无线信号质量比宏蜂窝基站的无线信号 质量高出预定的第一门限值且持续预定的第一时间段，表明 UE正进入相邻 蜂窝基站的覆盖范围，也是 UE确认自己进入该相邻蜂窝基站的覆盖范围的 一种方式；
如图 10所示， 毫微微蜂窝基站的 RSRP大于宏蜂窝基站的 RSRP—定 时间段后， 在 B点 （也即图 2中的 B点）触发测量事件；
步骤 604, 当 UE确认该相邻蜂窝基站的 PCI包含在从宏蜂窝基站收到 的 PCI 中时， 得知该相邻蜂窝基站为毫微微蜂窝基站， 则自动获取该毫微 微蜂窝基站的系统消息， 当确定系统消息中的封闭用户群标识 （CSG ID, closed subscriber group identity ) 不包含在自身预先存储的允许接入的 CSG ID列表中时， UE得知该毫微微蜂窝不允许自己接入， 则 UE根据从宏蜂窝 基站收到的或者从该毫微微蜂窝基站的系统消息中获取的资源分割情况， 自动改变测量方式为受限测量方式； 在使用受限测量方式之前， 测量方式 为常规测量方式；
另外， 宏蜂窝基站通过第一测量报告中的 PCI得知相邻蜂窝基站为毫 微微蜂窝基站，且之前没有收到 UE发来的接近指示（ proximity indication ), 则宏蜂窝基站得知 UE不允许接入该毫微微蜂窝基站，则宏蜂窝基站在该毫 微微蜂窝基站未使用的子帧上调度 UE;
步骤 605 ,当测量到毫微微蜂窝基站的无线信号质量比宏蜂窝基站的无 线信号质量低于预定的第二门限值且持续预定义的第二时间段后， 触发离 开事件， UE通过发送第二测量报告将该离开事件上报给宏蜂窝基站， 且自 动改变测量方式， 开始使用常规测量方式， 具体地说， 每个子帧处的无线 信号质量都有可能被 UE测量到。
测量到毫微微蜂窝基站的无线信号质量比宏蜂窝基站的无线信号质量
低于预定的第二门限值且持续预定的第二时间段，表明 U E正离开该毫微微 蜂窝基站的覆盖范围；这也是 UE确认自己离开该毫微微蜂窝基站的覆盖范 围的一种方式。
如图 10所示， 在 C点 （也即图 2中的 C点）触发离开事件。
实施例二
在实施例二中， UE 不允许接入毫微微蜂窝基站， 且宏蜂窝基站控制 UE改变测量方式。
如图 7所示， 实施例二中测量无线信号质量的方法包括：
步骤 701 , 当 UE接入宏蜂窝基站时， UE接收宏蜂窝基站发来的测量 配置消息； 测量配置的内容包括： 当相邻蜂窝基站的无线信号质量比宏蜂 窝基站的无线信号质量高出预定的第一门限值且持续预定的第一时间段 后， 触发测量事件； 当相邻蜂窝基站的无线信号质量比宏蜂窝基站的无线 信号质量低于预定的第二门限值且持续预定义的第二时间段后， 触发离开 事件；
实施例二中的测量配置消息与实施例一中的不同， 因为两个消息中的 测量配置内容是不一样的，在实施例一，服务蜂窝基站需告诉 UE有关的测 量模式改变的触发条件， 也许还包括 femto cell的资源分割的情况， 而实施 例中改变测量模式的决定是由服务蜂窝基站做的， 所以实施例二中的测量 配置消息只是一个普通的测量配置消息；
步骤 702,当测量到相邻蜂窝基站的无线信号质量比宏蜂窝基站的无线 信号质量高出预定的第一门限值且持续预定的第一时间段后， 触发测量事 件，且 UE通过发送第一测量报告将该测量事件上报给宏蜂窝基站； 第一测 量报告中至少包含有该相邻蜂窝基站的 PCI;
步骤 703 ,宏蜂窝基站通过第一测量报告中的 PCI得知相邻蜂窝基站为 毫微微蜂窝基站，且之前没有收到 UE发来的接近指示，则宏蜂窝基站得知
UE不允许接入该毫微微蜂窝基站， 则宏蜂窝基站通过向 UE发送专用信令 如第一无线资源控制连接重配置消息 （ RRC connection reconfiguration message )通知 UE改更测量方式, 该第一 RRC connection reconfiguration message中还可以包含有该毫微微蜂窝基站的资源分割情况；
步骤 704, UE根据收到的该毫微微蜂窝基站的资源分割情况， 改变测 量方式， 开始使用受限测量方式， 具体地说， UE忽略在该毫微微蜂窝基站 使用的子帧处测量到的无线信号质量；
步骤 705 ,当测量到毫微微蜂窝基站的无线信号质量比宏蜂窝基站的无 线信号质量低于预定的第二门限值时，触发离开事件，且 UE通过发送第二 测量报告将该离开事件上报给宏蜂窝基站；
步骤 706, 收到第二测量报告且持续预定的第二时间段后， 宏蜂窝基站 得知 UE正要离开毫微微蜂窝基站，则通过向 UE发送专用信令如第二 RRC connection reconfiguration message通知 UE改更测量方式；
步骤 707 , 收到该第二 RRC connection reconfiguration message后 , UE 改变测量方式， 开始使用常规测量方式。
在宏蜂窝基站收到第一测量报告之后， 发送第一 RRC connection reconfiguration message之前， 如果宏蜂窝基站需要进一步确认该毫微微蜂 窝基站是否真的不允许 UE接入， 则向 UE发送系统消息（SI )获取消息以 要求 UE获取毫微微蜂窝基站的 SI, UE将获得的毫微微蜂窝基站的 SI发 送给宏蜂窝基站， 宏蜂窝基站根据毫微微蜂窝基站的 SI得知该毫微微蜂窝 基站确实不允许 UE接入。
实施例三
在实施例三中， UE允许接入毫微微蜂窝基站。 如图 8所示， 实施例三 中测量无线信号质量的方法包括：
步骤 801 , 当 UE接入宏蜂窝基站时， UE接收宏蜂窝基站发来的测量
配置消息， 该测量配置消息为一个普通的测量配置消息；
步骤 802, 当 UE靠近允许自己接入的毫微微蜂窝基站时， 根据自己记 录的曾接入过的 femto cell, 可知该毫微微蜂窝基站允许自己接入， 则向 macro cell发送接近指示；
步骤 803 , 当测量到该 femto cell的无线信号质量比宏蜂窝基站的无线 信号质量高出预定的第一门限值且持续预定的第一时间段后， 触发测量事 件，且 UE通过发送第一测量报告将该测量事件上报给宏蜂窝基站； 第一测 量报告中包含有该毫微微蜂窝基站的 PCI;
步骤 804,宏蜂窝基站通过第一测量报告中的 PCI得知相邻蜂窝基站为 毫微微蜂窝基站， 且也收到了 UE发来的接近指示， 则宏蜂窝基站得知 UE 能接入该毫微微蜂窝基站， 则宏蜂窝基站向该 femto cell发送第一切换请求 消息；
在宏蜂窝基站收到第一测量报告之后， 如果宏蜂窝基站需要进一步确 认该毫微微蜂窝基站是否允许 UE接入， 则向 UE发送系统消息获取 ( SI ) 消息以要求 UE获取毫微微蜂窝基站的 SI, UE将获得的毫微微蜂窝基站的 SI发送给宏蜂窝基站， 宏蜂窝基站根据毫微微蜂窝基站的 SI得知 UE确实 允许接入该毫微微蜂窝基站；
步骤 805 , 收到第一切换请求消息后， femto cell经由 macro cell向 UE 发送第一切换命令消息以通知 UE进行切换，该第一切换命令消息中包含有 该 macro cell的资源分割情况 , 即该 macro cell使用哪些子帧；
其中， macro cell的资源分割情况可以由 macro cell或 femto cell添力口在 第一切换命令消息中； femto cell预先从 OAM获得 macro cell的资源分割情 况；
步骤 806, 根据收到的第一切换命令消息， UE与 macro cell断开连接 而接入 femto cell, 并向 femto cell发送第一切换完成消息； 在切换完成后，
UE根据 macro cell的资源分割情况， 将测量方式改变为受限测量方式， 即 UE忽略在 macro cell使用的子帧处测量到的无线信号质量。
当 UE切换到 femto cell后， femto cell成为了服务 cell, 而 macro cell 成为了干扰蜂窝基站。
当 UE离开 femto cell的覆盖范围时， 测量无线信号的方法与后面描述 的步骤 906至 909类似， 故在此不再赘述。
实施例四
UE靠近 pico cell的覆盖范围时， 如图 9a所示， 实施例四中测量无线 信号质量的方法包括：
步骤 901 , 当 UE接入宏蜂窝基站时， UE接收宏蜂窝基站发来的测量 配置消息， 该测量配置消息为一个普通的测量配置消息；
步骤 902,当测量到相邻蜂窝基站的无线信号质量比宏蜂窝基站的无线 信号质量高出预定的第一门限值且持续预定的第一时间段后， 触发测量事 件， 且 UE通过发送第一测量报告将该测量事件上报给宏蜂窝基站；
如图 11所示， 在 B点 （也即图 3中的 B点）触发测量事件；
步骤 903 ,根据收到的第一测量报告， macro cell得知该相邻 cell为 pico cell, 由于每个 UE都允许接入 pico cell, 所以 UE可以从 macro cell切换到 pico cell, 当 macro cell决定将 UE切换到 picocell 时, macro cell向 pico cell 发送第一切换请求 ( handover request ) 消息；
步骤 904, 收到第一切换请求消息后， 根据 OAM的配置， pico cell得 知自己位于该 macro cell的覆盖范围内， 则经由 macro cell向 UE发送第一 切换命令 ( handover command )消息以通知 UE进行切换， 该第一切换命令 消息中包含有该 macro cell的资源分割情况，即该 macro cell使用哪些子帧； 其中， macro cell的资源分割情况可以由 macro cell或 pico cell添力口在 第一切换命令消息中； pico cell预先从 OAM获得 macro cell的资源分割情
况；
步骤 905 , 根据收到的第一切换命令消息， UE与 macro cell断开连接 而接入 pico cell, 并向 pico cell发送第一切换完成 ( handover complete ) 消 息； 在切换完成后， UE根据 macro cell的资源分割情况， 改变测量方式， 开始使用受限测量方式， 即 UE忽略在 macro cell使用的子帧处测量到的无 线信号质量。
当 UE切换到 pico cell后 , pico cell成为了月良务 cell, 而 macro cell成为 了干扰蜂窝基站。
如图 9b所示， 当 UE离开 pico cell的覆盖范围时， 实施例四中测量无 线信号质量的方法包括：
步骤 906, 当测量到 pico cell的无线信号质量比 macro cell的无线信号 质量低于预定的第二门限值且持续预定的第二时间段后， 触发离开事件， 且 UE通过发送第二测量报告将该离开事件上报给 pico cell;
如图 11所示， 在 C点 （也即图 3中的 C点 ) , 微微蜂窝基站的 RSRP 比宏蜂窝基站的 RSRP小一定值时， 触发离开事件；
步骤 907, 根据收到的第二测量报告， pico cell得知 UE即将离开自身 的覆盖范围， 且需要切换回 macro cell, 则 pico cell向 macro cell发送第二 切换请求消息；
步骤 908, 根据收到的第二切换请求消息， macro cell经由 pico cell向 UE发送第二切换命令消息；
步骤 909, 根据收到的第二切换命令消息， UE与 pico cell断开连接而 接入 macro cell, 并向 macro cell发送第二切换完成消息； 在切换完成后， UE改变测量方式， 开始使用常规测量方式， 具体地说， 对在每个子帧处测 量到的无线信号质量都进行考虑。
UE切换回 macro cell后， macro cell又重新成为月良务 cell„
另夕卜，在实际应用中，如果 UE需在 pico cell中进行主叫或被叫通话时， 则 pico cell也需向 UE发送消息， 以将干扰 cell即 macro cell的资源分割情 况通知 UE,以使 UE立即釆用受限测量方式。该消息可以为 RRC connection reconfiguration消息， 其中包含有 macro cell的资源分割情况。
相应地， 本发明还提供一种无线信号质量的测量装置， 该装置位于 UE中， 该装置用于： 当 UE受到干扰蜂窝基站的干扰时， 使用受限测量 方式。
所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为 不允许所述 UE接入的毫微微蜂窝基站时， 且当装置确认进入该干扰蜂 窝基站的覆盖区范围后， 根据毫微微蜂窝基站的资源分割情况， 以及宏 蜂窝基站预先发来的当装置确认进入干扰蜂窝基站的覆盖区范围后改变 测量方式的通知， 将当前使用的常规测量方式改为受限测量方式。
所述装置还用于：当装置确认离开该干扰蜂窝基站的覆盖区范围后， 根据宏蜂窝基站预先发来的当装置确认离开干扰蜂窝基站的覆盖区范围 后改变测量方式的通知，将当前使用的受限测量方式改为常规测量方式。
所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰基站为不允 许所述 UE接入的毫微微蜂窝基站时， 且当装置确认进入该干扰蜂窝基 站的覆盖区范围后， 接收宏蜂窝基站发来的改变测量方式的第一通知， 并根据该第一通知和毫微微蜂窝基站的资源分割情况， 将当前使用的常 规测量方式改为受限测量方式。
所述装置还用于：当装置确认离开该干扰蜂窝基站的覆盖区范围后， 接收宏蜂窝基站发来的改变测量方式的第二通知， 并根据该第二通知将 当前使用的受限测量方式改为常规测量方式。
所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为 允许装置所属的 UE接入的低功率节点时， 且装置确认进入该低功率节
点的覆盖区范围后， 根据低功率节点经由宏蜂窝基站发来的第一切换命 令消息， 切换到低功率节点； 且在切换完成后， 根据第一切换命令消息 中包含的宏蜂窝基站的资源分割情况， 将当前使用的常规测量方式改为 受限测量方式。
所述装置还用于： 当装置确认离开该低功率节点的覆盖区范围后， 根据宏蜂窝基站经由低功率节点发来的第二切换命令消息， 切换回宏蜂 窝小区， 且在切换完成后， 将当前使用的受限测量方式改为常规测量方 式。
其中， 所述低功率节点为微微蜂窝基站或允许所述装置所属的 UE 接入的毫微微蜂窝基站。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。
Claims
1、 一种无线信号质量的测量方法， 其特征在于， 该方法包括： 当用户设备 UE受到干扰蜂窝基站的干扰时， UE使用受限测量方式； 其中， 受限测量方式指 UE根据干扰蜂窝基站的资源分割情况， 在测量 服务蜂窝基站的无线信号质量时， 忽略受干扰子帧处测量到的服务蜂窝 基站的无线信号质量， 仅考虑在非干扰子帧处测量到的服务蜂窝基站的 无线信号质量； 其中， 非干扰子帧指配置给服务蜂窝基站使用的子帧， 其余子帧为受干扰子帧。
2、 根据权利要求 1所述的无线信号质量的测量方法， 其特征在于， 所述方法还包括： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为不允 许所述 UE接入的毫微微蜂窝基站时， 且当 UE确认进入该干扰蜂窝基 站的覆盖区范围后， 根据毫微微蜂窝基站的资源分割情况， 以及宏蜂窝 基站预先发来的当 UE确认进入干扰蜂窝基站的覆盖区范围后改变测量 方式的通知， UE将当前使用的常规测量方式改为受限测量方式；
其中， 常规测量方式指： UE 考虑在每个子帧处测量到的服务蜂窝 基站的无线信号质量。
3、 根据权利要求 2所述的无线信号质量的测量方法， 其特征在于， 所述方法还包括： 当 UE确认离开该干扰蜂窝基站的覆盖区范围后， 根 据宏蜂窝基站预先发来的当 UE确认离开干扰蜂窝基站的覆盖区范围后 改变测量方式的通知， UE 将当前使用的受限测量方式改为常规测量方 式。
4、 根据权利要求 1所述的无线信号质量的测量方法， 其特征在于， 所述方法还包括： 当服务蜂窝基站为宏蜂窝基站， 干扰基站为不允许所 述 UE接入的毫微微蜂窝基站时， 且当 UE确认进入该干扰蜂窝基站的 覆盖区范围后， UE接收宏蜂窝基站发来的改变测量方式的第一通知， 并根据该第一通知和毫微微蜂窝基站的资源分割情况， 将当前使用的常 规测量方式改为受限测量方式。
5、 根据权利要求 4所述的无线信号质量的测量方法， 其特征在于， 所述方法还包括： 当 UE确认离开该干扰蜂窝基站的覆盖区范围后， UE 接收宏蜂窝基站发来的改变测量方式的第二通知， 并根据该第二通知将 当前使用的受限测量方式改为常规测量方式。
6、根据权利要求 3或 5所述的无线信号质量的测量方法， 其特征在 于， UE通过以下方式确认进入干扰蜂窝基站的覆盖范围：
UE 测量到所述干扰蜂窝基站的无线信号质量比宏蜂窝基站的无线 信号质量高出预定的第一门限值且持续预定的第一时间段；
UE通过以下方式确认离开干扰蜂窝基站的覆盖范围：
UE 测量到所述干扰蜂窝基站的无线信号质量比宏蜂窝基站的无线 信号质量低于预定的第二门限值且持续预定的第二时间段。
7、 根据权利要求 1所述的无线信号质量的测量方法， 其特征在于， 所述方法还包括： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为允许 所述 UE接入的低功率节点时， 且当 UE确认进入该低功率节点的覆盖 区范围后， 根据低功率节点经由宏蜂窝基站发来的第一切换命令消息， UE 切换到低功率节点； 且在切换完成后， 根据第一切换命令消息中包 含的宏蜂窝基站的资源分割情况， UE 将当前使用的常规测量方式改为 受限测量方式。
8、 根据 7所述的无线信号质量的测量方法， 其特征在于， 所述方法 还包括： 当 UE确认离开该低功率节点的覆盖区范围后， 根据宏蜂窝基 站经由低功率节点发来的第二切换命令消息， UE 切换回宏蜂窝小区， 且在切换完成后， UE将当前使用的受限测量方式改为常规测量方式。
9、 根据权利要求 8所述的无线信号质量的测量方法， 其特征在于， UE通过以下方式确认进入低功率节点的覆盖范围：
UE 测量到所述低功率节点的无线信号质量比宏蜂窝基站的无线信 号质量高出预定的第一门限值且持续预定的第一时间段；
UE通过以下方式确认离开低功率节点的覆盖范围：
UE 测量到所述低功率节点的无线信号质量比宏蜂窝基站的无线信 号质量低于预定的第二门限值且持续预定的第二时间段。
10、 根据权利要求 7、 8或 9所述的无线信号质量的测量方法， 其特 征在于， 所述低功率节点为微微蜂窝基站或允许所述 UE接入的毫微微 蜂窝基站。
11、 一种无线信号质量的测量装置， 其特征在于， 该装置位于 UE 中， 该装置用于： 当 UE受到干扰蜂窝基站的干扰时， 使用受限测量方 式； 其中， 受限测量方式指装置根据干扰蜂窝基站的资源分割情况， 在 测量服务蜂窝基站的无线信号质量时， 忽略受干扰子帧处测量到的无线 信号质量， 仅考虑在非干扰子帧处测量到的无线信号质量； 其中， 非干 扰子帧指配置给服务蜂窝基站使用的子帧， 其余子帧为受干扰子帧。
12、 根据权利要 1 1所述的无线信号质量的测量装置， 其特征在于， 所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为不允 许所述 UE接入的毫微微蜂窝基站时， 且当装置确认进入该干扰蜂窝基 站的覆盖区范围后， 根据毫微微蜂窝基站的资源分割情况， 以及宏蜂窝 基站预先发来的当装置确认进入干扰蜂窝基站的覆盖区范围后改变测量 方式的通知， 将当前使用的常规测量方式改为受限测量方式；
其中， 常规测量方式指： 装置考虑在每个子帧处测量到的服务蜂窝 基站的无线信号质量。
13、根据权利要求 12所述的无线信号质量的测量方法，其特征在于， 所述装置还用于： 当装置确认离开该干扰蜂窝基站的覆盖区范围后， 根 据宏蜂窝基站预先发来的当装置确认离开干扰蜂窝基站的覆盖区范围后 改变测量方式的通知， 将当前使用的受限测量方式改为常规测量方式。
14、根据权利要求 11所述的无线信号质量的测量装置，其特征在于， 所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰基站为不允许所 述 UE接入的毫微微蜂窝基站时， 且当装置确认进入该干扰蜂窝基站的 覆盖区范围后， 接收宏蜂窝基站发来的改变测量方式的第一通知， 并根 据该第一通知和毫微微蜂窝基站的资源分割情况， 将当前使用的常规测 量方式改为受限测量方式。
15、 根据要求 14所述的无线信号质量的测量装置， 其特征在于， 所 述装置还用于： 当装置确认离开该干扰蜂窝基站的覆盖区范围后， 接收 宏蜂窝基站发来的改变测量方式的第二通知， 并根据该第二通知将当前 使用的受限测量方式改为常规测量方式。
16、根据权利要求 11所述的无线信号质量的测量装置，其特征在于， 所述装置还用于： 当服务蜂窝基站为宏蜂窝基站， 干扰蜂窝基站为允许 装置所属的 UE接入的低功率节点时， 且装置确认进入该低功率节点的 覆盖区范围后， 根据低功率节点经由宏蜂窝基站发来的第一切换命令消 息， 切换到低功率节点； 且在切换完成后， 根据第一切换命令消息中包 含的宏蜂窝基站的资源分割情况， 将当前使用的常规测量方式改为受限 测量方式。
17、根据权利要求 16所述的无线信号质量的测量装置，其特征在于， 所述装置还用于： 当装置确认离开该低功率节点的覆盖区范围后， 根据 宏蜂窝基站经由低功率节点发来的第二切换命令消息， 切换回宏蜂窝小 区， 且在切换完成后， 将当前使用的受限测量方式改为常规测量方式。
18、 根据权利要求 16或 17所述的无线信号质量的测量装置， 其特 征在于， 所述低功率节点为微微蜂窝基站或允许所述装置所属的 UE接 入的毫微微蜂窝基站,
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