WO2013107363A1 - Procédé d'amélioration de la mobilité, équipement d'utilisateur et station de base - Google Patents

Procédé d'amélioration de la mobilité, équipement d'utilisateur et station de base Download PDF

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Publication number
WO2013107363A1
WO2013107363A1 PCT/CN2013/070604 CN2013070604W WO2013107363A1 WO 2013107363 A1 WO2013107363 A1 WO 2013107363A1 CN 2013070604 W CN2013070604 W CN 2013070604W WO 2013107363 A1 WO2013107363 A1 WO 2013107363A1
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Prior art keywords
carrier frequency
mobility
reselection
specific
configuration parameters
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PCT/CN2013/070604
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English (en)
Chinese (zh)
Inventor
谢峰
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中兴通讯股份有限公司
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Publication of WO2013107363A1 publication Critical patent/WO2013107363A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports

Definitions

  • Mobility enhancement method user equipment and base station
  • the present invention relates to the field of wireless communication technologies, and in particular, to a mobility enhancement method, a user equipment, and a base station. Background technique
  • a base station is a device that provides wireless access for a user equipment (User Equipment, also referred to as a UE, also referred to as a terminal), and one base station may include one or more serving cells.
  • the cell can provide communication services for a certain range of UEs. Different cells may have different coverage areas.
  • the cells can be divided into macro cells and pico cells according to the coverage of the cells and the purpose of deployment.
  • femto cell correspondingly, the base station providing these cells may also be referred to as a macro base station, a micro base station, and a home base station.
  • Wireless cellular communication systems have evolved in a variety of formats, such as the second generation of mobile communication technologies (GSM (Global System for Mobile Communications), CDMA (Code Division Multiple Access), CDMA (Code Division Multiple Access) ) ), third-generation mobile communication technology (WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), CDMA-2000) , Wimax ( Worldwide Interoperability for Microwave Access), Evolved Third or Fourth Generation Mobile Telecommunications (LTE (Long Term Evolution), LTE-A (LTE-Advanced, Advanced Long Term) Evolution), Wimax2.0).
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • CDMA-2000 Code Division-2000
  • Wimax Worldwide Interoperability for Microwave Access
  • Evolved Third or Fourth Generation Mobile Telecommunications LTE (Long Term
  • GSM Global System Terrestrial Radio Access Network
  • LTE/LTE-A corresponds to E-UTRAN (Evolved UTRAN).
  • wireless communication systems include wireless local area networks (WLAN or WIFI).
  • These wireless communication systems allow for a wide range of carrier frequencies, from 700 MHz up to 60 GHz.
  • the propagation characteristics of wireless electromagnetic waves determine the higher the carrier frequency, the poorer the coverage performance, and the penetration. The worse the performance, the more significant the Doppler effect when the UE moves. Therefore, the carrier's deployment of lower carrier frequencies is usually for a wide range of coverage, and the coverage of the corresponding cells is also large.
  • the support for fast mobile UEs is also better, and carriers deploy higher carrier frequencies. For the purpose of improving the capacity or throughput of the hotspot area, the coverage of the corresponding cell is also small, and the support capability for the UE's fast mobility is degraded.
  • the UE performs according to a cell offset, a measured signal strength, a carrier frequency priority, a carrier offset (offset), a hypothesis factor, a reselection time, or a measurement report trigger time (or simply a trigger time).
  • Cell reselection and measurement report for handover preparation
  • the process of cell reselection and handover considering the difference in UE moving speed, the higher the speed, the smaller the delay requirement for reselection or handover, so The higher the moving speed, the smaller the hypothesis factor, the smaller the reselection time, and the shorter the measurement report trigger time, making the reselection or switching more acute.
  • the problem that the moving speed has different effects on different carrier frequencies is not considered, that is, since the carrier frequency range used for mobile communication ranges from 700 Mhz to 60 Ghz, the higher the carrier frequency, the worse the coverage performance and the penetration.
  • the worse the performance the more significant the Doppler effect when the terminal moves, and the faster the terminal moves, the longer the route that passes through the unit time, the more times the reselection and switching occur, and the more disadvantageous it is to use high frequency communication.
  • an embodiment of the present invention provides a mobility enhancement method, including: setting, by a user equipment, reselection and/or measurement configuration parameters at a specific mobility specific carrier frequency, or receiving the specific mobility from a base station. Reselection and/or measurement configuration parameters at a particular carrier frequency; and reselection and/or measurement by the user equipment based on mobility of the user equipment, current service carrier frequency, reselected or measured target carrier frequency Configuration parameters are re-selected or measured.
  • the reselection and/or measurement configuration parameters at the particular mobility specific carrier frequency include one or a combination of the following:
  • Carrier frequency offset at a specific mobility specific carrier frequency Threshold information for a particular mobility specific carrier frequency
  • Reselection time at a specific mobility specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • the above method may also have the following features, the mobility including the mobility capability and/or the mobility state of the user equipment.
  • the above method may also have the following features:
  • the reselection and/or measurement configuration parameters satisfy the following conditions:
  • the greater the moving speed the more the carrier frequency is selected to be lower in the optional carrier frequency.
  • the embodiment of the present invention further provides a mobility enhancement method, including: sending, by a base station, a reselection and/or measurement configuration parameter at a specific mobility specific carrier frequency to a user equipment.
  • the above method may also have the following features:
  • the reselection and/or measurement configuration parameters satisfy the following conditions:
  • the greater the moving speed the more the carrier frequency is selected to be lower in the optional carrier frequency.
  • the reselection and/or measurement configuration parameters at the specific mobility specific carrier frequency include:
  • Reselection and/or measurement configuration parameters for one or more specific carrier frequencies for a plurality of specific mobility or, reselection and/or measurement configuration of one or more specific carrier frequencies for current mobility of the user equipment parameter.
  • the step of the base station transmitting the reselection and/or measurement configuration parameters of the specific mobility specific carrier frequency to the user equipment includes:
  • the base station uses the reselection and/or measurement configuration parameters of each specific carrier frequency under mobility as a basis for reselecting and/or measuring configuration parameters of each specific carrier frequency, and adjusting the specific carrier frequencies under other mobility.
  • a factor is sent to the user equipment, wherein reselection and/or reselection of each specific carrier frequency under other mobility
  • the measurement configuration parameters are determined based on the base reselection and/or measurement configuration parameters of the respective carrier frequencies and the adjustment factor.
  • the method further includes: the base station acquiring, from the network management system, reselection and/or measurement configuration parameters at the specific mobility specific carrier frequency.
  • the reselection and/or measurement configuration parameters at the particular mobility specific carrier frequency include one or a combination of the following:
  • Reselection time at a specific mobility specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • the embodiment of the invention further provides a user equipment, including:
  • a parameter configuration unit configured to: set reselection and/or measurement configuration parameters at a particular mobility specific carrier frequency, or receive reselection and/or measurement configuration parameters at the particular mobility specific carrier frequency from a base station;
  • a processing unit configured to: perform reselection and/or measurement report processing according to reselection and/or measurement configuration parameters corresponding to mobility of the user equipment, current serving carrier frequency, reselected or measured target carrier frequency .
  • the user equipment may also have the following characteristics: the reselection and/or measurement configuration parameters of the specific mobility specific carrier frequency include one or a combination of the following:
  • the measurement of the specific mobility at a specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • the above user equipment may also have the following characteristics, the mobility including the mobility capability and/or the mobility state of the user equipment.
  • the above user equipment may also have the following characteristics, and the reselection and/or measurement configuration parameters satisfy the following conditions:
  • the greater the moving speed the more the carrier frequency is selected to be lower in the optional carrier frequency.
  • the embodiment of the invention further provides a base station, including:
  • a parameter dispatching unit configured to transmit reselection and/or measurement configuration parameters at a particular mobility specific carrier frequency to the user equipment.
  • the above base station may also have the following features, and the reselection and/or measurement configuration parameters satisfy the following conditions:
  • the greater the moving speed the more the carrier frequency is selected to be lower in the optional carrier frequency.
  • the reselection and/or measurement configuration parameters at the specific mobility specific carrier frequency include:
  • Reselection and/or measurement configuration parameters for one or more specific carrier frequencies for a plurality of specific mobility or, reselection and/or measurement configuration of one or more specific carrier frequencies for current mobility of the user equipment parameter.
  • the foregoing base station may further have the following feature, the parameter sending unit is configured to send reselection and/or measurement configuration parameters in the specific mobility specific carrier frequency by: transmitting a specific mobility under a specific load Frequency reselection and/or measurement configuration parameters are used as basic reselection and/or measurement configuration parameters for each specific carrier frequency, and adjustment factors for specific carrier frequencies under other mobility are transmitted to the user equipment, wherein other movements The reselection and/or measurement configuration parameters for each particular carrier frequency are determined based on the underlying reselection and/or measurement configuration parameters of the particular carrier frequency and the adjustment factor.
  • the base station further includes a parameter obtaining unit, where the parameter obtaining unit is configured to be from a network management
  • the system acquires reselection and/or measurement configuration parameters for the particular mobility specific carrier frequency.
  • the foregoing base station may also have the following features: the reselection and/or measurement configuration parameters in the specific mobility specific carrier frequency include one or a combination of the following:
  • Reselection time at a specific mobility specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • 1 is a schematic diagram of coverage of a multi-carrier frequency network
  • 2 is another coverage diagram of a multi-carrier frequency network
  • FIG. 3 is a basic flow chart of Embodiment 1 of the present invention.
  • FIG. 5 is a specific flowchart of Embodiment 1 of the present invention.
  • Embodiment 8 is a basic flowchart of Embodiment 2 of the present invention.
  • FIG. 9 is a block diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 10 is a block diagram of a base station in accordance with an embodiment of the present invention. Preferred embodiment of the invention
  • the embodiment of the invention provides a mobility enhancement method, including:
  • the UE sets reselection and/or measurement configuration parameters at a particular mobility specific carrier frequency, or receives reselection and/or measurement configuration parameters at the particular mobility specific carrier frequency from the base station;
  • the UE performs reselection or measurement report processing based on reselection and/or measurement configuration parameters corresponding to its mobility, current serving carrier frequency, reselected or measured target carrier frequency.
  • the reselection and/or measurement configuration parameters at a particular mobility specific carrier frequency include reselection and/or measurement configuration parameters at one or more specific mobility specific carrier frequencies.
  • the reselection and/or measurement configuration parameters include one or a combination of the following: a carrier frequency offset of a particular carrier frequency at a particular mobility;
  • Reselection time at a specific mobility specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • the mobility includes a mobility capability and/or a mobility state; wherein the mobility capability includes at least one of the following mobility capabilities: mobile capabilities of the fixed terminal, mobile capabilities of the nomadic terminal, mobile capabilities of the low mobility capable terminal, and high mobility capable terminal
  • the moving state includes at least one of the following moving states: a high moving state, a medium moving state, and a low moving state.
  • moving states and moving capabilities may also be defined, which is not limited by the present invention, and the moving state is based on The UE's moving speed is differentiated.
  • the reselection and/or measurement configuration parameters satisfy the following conditions:
  • Allowing the user equipment to move at a speed when reselecting according to the reselection and/or measurement configuration parameters The larger the value, the more likely it is to select the carrier frequency that is lower in the optional carrier frequency.
  • the embodiment of the present invention further provides a mobility enhancement method, including: sending, by a base station, a reselection and/or measurement configuration parameter at a specific mobility specific carrier frequency to a user equipment.
  • the reselection and/or measurement configuration parameters at the specific mobility specific carrier frequency include: a plurality of reselection and/or measurement configuration parameters at a specific carrier frequency or a plurality of specific carrier frequencies;
  • the current mobility of the user equipment is a reselection and/or measurement configuration parameter of one or more specific carrier frequencies.
  • the base station transmits reselection and/or measurement configuration parameters in the specific mobility specific carrier frequency by:
  • the base station uses the reselection and/or measurement configuration parameters of each specific carrier frequency under mobility as a basis for reselecting and/or measuring configuration parameters of each specific carrier frequency, and adjusting the specific carrier frequencies under other mobility.
  • a factor is sent to the user equipment, wherein reselection and/or measurement configuration parameters for each particular carrier frequency under other mobility are determined based on a base reselection and/or measurement configuration parameter for each particular carrier frequency and the adjustment factor.
  • the method further includes: the base station acquiring reselection and/or measurement configuration parameters of the specific mobility specific carrier frequency from a network management system.
  • the reselection and/or measurement configuration parameters of the specific mobility specific carrier frequency include one or a combination of the following:
  • Reselection time at a specific mobility specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • the reselection and/or measurement configuration parameters satisfy the following conditions:
  • a region's wireless communication network may have multiple carrier frequencies that provide good services (for example, 800 MHz typically used for GSM communications and 1800 MHz typically used for LTE communications).
  • the cell of the carrier frequency has different coverage. The figure shows that the coverage of the 800 MHz GSM cell is large, while the coverage of the 1800 MHz LTE cell is small.
  • the size of the cell coverage is related to the carrier frequency on the one hand:
  • the propagation characteristics of the wireless electromagnetic wave determine that the higher the carrier frequency, the worse the coverage performance, and the worse the penetration performance, the more significant the Doppler effect when the UE moves;
  • the coverage of the cell is also related to the deployment of the operator.
  • the operator may deploy 800MHz GSM as a network that provides seamless coverage for users, and deploy 1800Mhz LTE as a network that provides hotspot high-speed service services to users.
  • the coverage of the cell is also related to Radio Access Technology (RAT).
  • RAT Radio Access Technology
  • 800MHz GSM provides wide coverage
  • 2.4GHz LTE and 5GHz WLAN (or WIFI) provide hotspot coverage. .
  • a carrier frequency usually corresponds to a specific access technology and access network.
  • 800Mhz corresponds to GSM, GERAN, 1800Mhz. It corresponds to LTE and E-UTRAN with 2350Mhz, and WIFI for 2460MHz and 5GHz. Therefore, when considering the carrier frequency, the specific access technology/system on the carrier frequency is actually taken into account, or the specific carrier frequency implicitly indicates the specific system.
  • the carrier deploys a lower carrier frequency for the purpose of wide coverage, and the coverage of the corresponding cell is also large, and the support capability for the UE to move quickly is also good, and the carrier deploys a higher carrier frequency usually For the purpose of improving the capacity or throughput of the hotspot area, the coverage of the corresponding cell is also small, and the support capability for the UE to move quickly decreases.
  • the terminal moves fast, it is more suitable for mobile communication with low coverage performance. This can not only reduce the number of reselections and/or handovers, but also further reduce the failure rate of reselection or handover, and reduce the overhead of the terminal and the network. It also helps the terminal's power saving. That is to say, the moving speed of the terminal should have a plus effect for preferentially selecting a low carrier frequency, or a preferential action for preferentially selecting a high carrier frequency. For this reason, the offset of the carrier frequency through different terminal moving speeds should also be different. The higher the moving speed, the larger the offset of the low carrier frequency (so that the lower carrier frequency is preferred). As shown in Figure 1 and Figure 2, high-speed mobile UEs should prefer 800MHz, while fast-moving UEs should prefer 1800MHz, 2.4GHz (or 5GHz).
  • the reselection and measurement parameters should also vary with the UE's moving speed and carrier frequency.
  • Step 301 The UE receives reselection and/or measurement configuration parameter information sent by the base station, where the parameter information is included in a specific mobility specific carrier frequency.
  • Step 302 The UE performs reselection or measurement processing according to the reselection and/or measurement configuration parameters corresponding to the mobility, the current service carrier frequency, the reselected or the measured target carrier frequency.
  • FIG. 4 is a flow chart of the first embodiment of the present invention. As shown in Figure 4, the following steps are included.
  • Step 401 The base station is from the network management system (for example, operation, management, and maintenance (Operation,
  • Step 402 The UE receives a reselection or measurement parameter configuration from the base station.
  • Step 403 The UE performs a process of performing reselection or measurement reporting according to the reselection or measurement parameter configuration received from the base station.
  • FIG. 5 is a specific flowchart of Embodiment 1 of the present invention. As shown in Figure 5, the following steps are included.
  • Step 501 The UE receives carrier frequency offset information that is sent by the base station under a specific mobility.
  • Step 502 The UE determines its own mobility. If it is high speed, step 503 is performed. If it is medium speed, step 504 is performed. If it is low speed, step 505 is performed.
  • the high speed, medium speed and low speed are the speed ranges defined in the embodiment, and more or less speed ranges can be defined as needed, for example, only the speed ranges of high speed and low speed are defined, or the medium speed is divided into The two speed ranges and the like are not limited by the present invention.
  • Step 503 The UE evaluates the inter-frequency (including heterogeneous) cells by using the carrier frequency offset at a high speed, and the process ends.
  • Step 504 The UE evaluates the inter-frequency (including heterogeneous) cells by using the carrier frequency offset at the medium speed, and the process ends.
  • Step 505 The UE uses a carrier frequency offset at a low speed to perform an inter-frequency (including heterogeneous) cell. Evaluation, the process ends.
  • the cells are ranked according to the following formula (ranking):
  • Rn Qmeas,n-Qoffset
  • Rs and Rn are the measurement parameters for ranking the serving cell and the neighboring cell respectively, Qmeas, s and Qmeas, where n is the signal strength measurement value of the UE to the serving cell or the neighboring cell, respectively, Qhyst is a hypothesis factor, Qoffset is The inter-frequency cell is equal to Qoffsets, n (cell offset between the serving cell and the adjacent interval) plus Qoffsetfrequency (the carrier frequency offset between the service carrier and the target carrier frequency), if there is no valid Q 0 ffsets, n value , then Qoffset is equal to Qoffsetfrequency.
  • Qmeas, s and Qmeas, n are obtained by the UE by measuring the serving cell and the neighboring cell, and other parameters are received by the UE from the System Information Block (SIB) sent by the base station.
  • SIB System Information Block
  • the UE uses the corresponding carrier frequency offset according to its own mobile state when using Qoffsetfrequency.
  • the base station broadcasts a carrier frequency offset corresponding to different mobile states (eg, low speed, medium speed, high speed) through system information, or the base station broadcasts a base offset corresponding to a specified mobile state, and the other In the moving state, the adjustment is performed according to the base offset and the corresponding Scaling Factor parameter.
  • the base offset can be directly used at low speed, and the intermediate speed and high speed need to be adjusted according to the offset adjustment factor corresponding to the medium speed and high speed broadcasted by the base station, and the UE will adjust the medium speed and high speed.
  • the carrier frequency offset corresponding to the medium speed and high speed is obtained by adding the base offset.
  • the carrier frequency offset at different speeds configured by the base station is derived from the network management system of the base station (e.g., OAM).
  • the mobile state of the terminal itself may be obtained by a positioning method (for example, a Global Positioning System (GPS) positioning method or a base station positioning method), or may be determined according to a certain The number of cells passing through the time is judged and obtained, and can also be obtained according to a sensor capable of sensing the moving speed.
  • a positioning method for example, a Global Positioning System (GPS) positioning method or a base station positioning method
  • GPS Global Positioning System
  • base station positioning method for example, a Global Positioning System (GPS) positioning method or a base station positioning method
  • the UE After the UE measures and ranks the serving cell and the neighboring cell (which may include the same-frequency cell and the same-priority inter-frequency cell) according to the above method, it can determine whether the neighboring cell ranks higher than the serving cell (this The neighboring cell may also be referred to as the target cell. When the state continues for more than a certain period of time (ie, the reselection time), the UE may reselect the target cell.
  • the UE By appropriately setting the offset adjustment factor or the carrier frequency offset of a specific carrier frequency in a specific mobile state, the UE is less likely to reselect the carrier frequency at a higher speed at a high speed, or the UE is at a higher speed. It is easy to reselect to a lower frequency carrier frequency.
  • the serving carrier frequency that is, the carrier frequency of the cell in which the UE currently camps
  • the reselection parameter information broadcasted by the base station indicates the (basic) corresponding to the 1800 Mhz carrier frequency.
  • the frequency offset is -3dB
  • the reselection parameter information also indicates that the offset adjustment factor corresponding to the 1800Mhz carrier frequency is 6dB at high speed.
  • the actual carrier frequency offset Qoffsetfrequency used is 3 dB. In this way, the high-speed UE is allowed to stay in the cell with low-frequency carrier frequency with good performance, thereby reducing the number of cell reselection, reducing the overhead, and saving power.
  • the base station may also affect the measurement reporting behavior of the UE under different mobility, thereby improving the mobile performance of the UE.
  • the UE in the connected state measures the serving cell and the neighboring cell (which may include the inter-frequency cell), and determines whether the measurement report is triggered according to the configuration of the measurement report event configured by the base station for the UE.
  • the measurement report event configured by the base station includes an A3 event, and the entry condition of the event is an inequality Mn+Ofii+Ocn-hys>Mp+0+Ocp+off, and the leaving condition is an inequality Mn+Ofii+Ocn+hys ⁇ Mp+0+Ocp +off.
  • Mn and Mp are measured values of the signals of the UE to the neighboring cell and the primary serving cell
  • 0 and ⁇ ⁇ are the target carrier frequency (the measured carrier frequency used by the neighboring cell) and the carrier frequency offset of the primary month carrier frequency carrier.
  • Ocn and Ocp are the cell offsets of the neighboring cell and the primary month traffic cell, hys is the hypothesis factor, and off is the offset of the event.
  • the UE initiates a measurement report.
  • the UE uses the corresponding carrier frequency offset according to its own moving state when using 0 and ⁇ .
  • the base station transmits different mobile states through the measurement configuration (for example, low speed, medium speed) , high speed) carrier frequency offset corresponding to the main service carrier frequency and other carrier frequencies, or the measurement configuration information sent by the base station includes the base offset for each carrier frequency, and the base of the corresponding carrier frequency can be directly used at low speed.
  • the offset while at medium speed and high speed, it needs to operate according to the Scaling Factor parameter of each carrier frequency corresponding to the medium speed and high speed in the measurement configuration information, and the UE will be in a certain carrier frequency.
  • the adjustment factor at the speed or high speed is added to the base offset of the carrier frequency to obtain the carrier frequency offset corresponding to the medium speed or high speed.
  • the (basic) carrier frequency offset corresponding to the 900 MHz carrier frequency indicated by the base station is OdB
  • the 1800 Mhz carrier frequency corresponds to The base carrier offset is 6 dB
  • the measurement configuration information indicates that the offset adjustment factor corresponding to the 900 MHz carrier frequency is 3 dB at high speed, and the offset adjustment factor corresponding to the 1800 Mhz carrier frequency is -4 dB.
  • the mobile state of the terminal itself may be obtained from a positioning method (for example, a GPS positioning method or a base station positioning method), or may be obtained according to the number of cells passing through a certain period of time, or may be obtained according to a sensor capable of sensing the moving speed.
  • a positioning method for example, a GPS positioning method or a base station positioning method
  • the actual carrier frequency offsets 0 and ⁇ ⁇ used are 2 dB and 3 dB, respectively.
  • the UE is less likely to reselect the carrier frequency with higher frequency at high speed, or the UE is more likely to reselect the carrier frequency with lower frequency at high speed, thereby making the high-speed UE use the low coverage as much as possible.
  • the frequency carrier frequency reduces the number of switching and the switching failure rate, while reducing overhead and contributing to power saving.
  • the base station may also configure different parameters for the UE according to the mobile state of the UE, so that after receiving the parameters configured by the base station, the UE may directly use the parameter. Measurement processing.
  • the base station may also affect the measurement reporting behavior of the UE under different mobility, thereby improving the UE's mobile performance.
  • the UE in the connected state measures the serving cell and the neighboring cell (which may include the inter-frequency cell), and determines whether the measurement report is triggered according to the configuration of the measurement report event configured by the base station for the UE.
  • the measurement report event configured by the base station includes an A4 event or an A5 event or a B1 event or a B2 event, where
  • the entry condition for the A4 event applicable to the E-UTRAN cell is the inequality Mn+Ofii+Ocn-hys>Thresh, and the leaving condition is the inequality Mn+Ofii+Ocn+hys ⁇ Thresh;
  • the entry condition for the B1 event applicable to the heterogeneous cell is Inequality Mn+Ofii-hys>Thresh, leaving condition is inequality Mn+Ofii+hys ⁇ Thresh;
  • the entry conditions for the A5 event applicable to the E-UTRAN cell are the inequalities Mp+hys ⁇ Thresh and Mn+Ofii+Ocn-hys>Thresh2, and the leaving condition is the inequality Mp-hys>Thresh and Mn+Ofii+Ocn+hys ⁇ Thresh2;
  • the entry condition for B2 events applicable to heterogeneous cells is the inequality Mp+hys ⁇ Thresh and
  • Mn and Mp are the measured values of the signals of the UE to the neighboring cell and the primary serving cell
  • Ofii is the carrier frequency offset of the target carrier frequency (the measured carrier frequency used by the neighboring cell)
  • Ocn is the cell offset of the neighboring cell.
  • the amount, hys is the hypothesis factor, and Thresh and Thresh2 are the event-related thresholds.
  • the UE When the entry condition is met and its duration exceeds the time to Trigger, the UE initiates a measurement report. Considering the impact of different mobile speeds of the UE on different carrier frequencies, the UE uses the corresponding carrier frequency offset according to its own mobile state when using 0. To this end, the base station transmits different mobile states through the measurement configuration (for example, low speed, medium Speed, high speed)
  • the carrier frequency offset corresponding to the adjacent carrier frequency, or the measurement configuration information sent by the base station includes the base offset for each carrier frequency, and the base offset of the corresponding carrier frequency can be directly used at low speed.
  • the UE At medium speed and high speed, it is necessary to operate according to the Scaling Factor parameter of each carrier frequency corresponding to the medium speed and high speed in the measurement configuration information, and the UE will have a medium speed or high speed of a certain carrier frequency.
  • the adjustment factor of the time is added to the base offset of the carrier frequency to obtain a carrier frequency offset corresponding to the medium speed or the high speed.
  • the carrier frequency of the service is 900 Mhz and the neighbor carrier frequency measured by the UE is 1800 Mhz
  • the (basic) carrier frequency offset corresponding to the 1800 Mhz carrier frequency is 6 dB in the measurement configuration information sent by the base station, and the indication in the measurement configuration information is At high speeds
  • the 1800Mhz carrier frequency corresponds to an offset adjustment factor of -4dB.
  • the mobile state of the terminal itself can be determined from a positioning method (for example, a GPS positioning method or a base station)
  • the bit method can also be obtained according to the number of cells passing through a certain period of time, and can also be obtained according to a sensor capable of sensing the moving speed.
  • the actual carrier offset 0 used is 2 dB.
  • the UE is less likely to reselect the carrier frequency with higher frequency at high speed, or the UE is more likely to reselect the carrier frequency with lower frequency at high speed, thereby making the high-speed UE use the low coverage as much as possible.
  • the frequency carrier frequency reduces the number of switching and the switching failure rate, while reducing overhead and contributing to power saving.
  • the base station may also configure different parameters for the UE according to the mobile state of the UE, so that after receiving the parameters configured by the base station, the UE may directly use the parameter. Measurement processing.
  • the base station may also affect the measurement reporting behavior of the UE under different mobility, thereby improving the UE's mobile performance.
  • FIG. 6 is a second specific flow chart of the first embodiment of the present invention. As shown in Figure 6, the following steps are included.
  • Step 601 The UE receives threshold information corresponding to a specific carrier frequency sent by the base station.
  • Step 603 The UE evaluates the inter-frequency (including the heterogeneous) cell by using the threshold parameter of the corresponding carrier frequency at a high speed, and the process ends.
  • Step 604 The UE evaluates the inter-frequency (including heterogeneous) cells by using the threshold parameters of the corresponding carrier frequencies at the medium speed, and the process ends.
  • Step 605 The UE evaluates the inter-frequency (including heterogeneous) cells by using the threshold parameters of the corresponding carrier frequencies at a low speed, and the process ends.
  • the UE After the UE in the idle state (Idle) state measures the serving cell and the inter-frequency cell or the heterogeneous cell of different priorities, the UE performs the judgment according to the following criteria. (1) If Thresh Servmg , LowQ is provided in the system information, when the high-priority E-UTRAN carrier cell, the UTRAN carrier cell, or the WIMAX carrier cell meets Sq ua l>Thresh x , H lg hQ during the TreselectionRAT period And the UE camps for more than 1 second in the current serving cell, and the UE performs reselection of the E-UTRAN carrier frequency or the cross-standard carrier frequency from the current carrier frequency to the high priority; or when the high priority GERAN, CDMA-2000 Or WIFI carrier frequency cell meets during the TreselectionRAT period
  • Threshservm gj LowQ is not provided in the system information, when the high priority E-UTRAN carrier frequency cell or the heterogeneous carrier frequency cell satisfies Srxlev>Threshx, HighP during the Treselection RAT period, and the UE is in the current serving cell camp time For more than one second, the UE performs a reselection of the carrier frequency from the current carrier frequency to the high priority.
  • Thresh Servmg is provided in the system information, l .
  • WQ when the serving cell meets Squal ⁇ Threshservmg, LOWQ, and the low priority E-UTRAN carrier frequency cell, UTRAN carrier frequency cell, or WIMAX carrier frequency cell satisfies Squal > Thresh x , LowQ and the UE is currently serving during the Treselection RAT period
  • the cell camping time exceeds 1 second, and the UE performs reselection from the current carrier frequency to the low priority E-UTRAN carrier frequency or cross-standard carrier frequency; or when the low priority GERAN, CDMA-2000 or WIFI is in the Treselection RAT period
  • the frequency cell satisfies Srx1 ev >Thresh x , H lg hP , and the UE camps for more than 1 second in the current serving cell, and the UE performs reselection of the GERAN, CDMA-2000 or WIFI carrier frequency from the current
  • Thresh Servmg is not provided in the system information, l . WQ, then the Srxlev ⁇ Thresh SeTOng , L is satisfied when the serving cell is in the Treselection RAT period.
  • wP and the low priority carrier frequency cell satisfies Srxlev>Threshx, LowP , and the UE camps for more than 1 second in the current serving cell, and the UE performs reselection from the current carrier frequency to the low priority carrier frequency.
  • Srxlev and Squal are cell selection reception level values and cell selection quality values obtained by the UE based on the measurement of the (serving or target) cell, and other parameters are received by the UE from the system information sent by the base station, These parameters include threshold parameters ( Threshservmg, LowQ ⁇
  • Threshservmg L 0W p, Thresh x , Low p, Thresh x , LowQ
  • TreselectionRAT reselection time parameters
  • the UE uses corresponding parameters according to its own mobile state when using threshold parameters and/or time parameters (different speeds of base station configuration)
  • the parameters of different carrier frequencies and/or standards are derived from the network management system of the base station, so that the base station broadcasts different modes and/or carrier frequencies under different mobile states (eg, low speed, medium speed, high speed) through system information blocks (SIBs).
  • SIBs system information blocks
  • Corresponding threshold parameters and reselection time parameters or the base station broadcasts a basic threshold parameter or a reselection time parameter, which can be directly used at low speed, and correspondingly according to the medium speed and high speed broadcasted by the base station at medium speed and high speed.
  • the Scaling Factor parameter is operated, and the UE adds the medium-speed, high-speed adjustment factor to the basic threshold parameter or the reselection time parameter (for the threshold parameter) or multiplies (for the reselection time parameter) to obtain the medium speed. , corresponding threshold parameters and reselection time parameters at high speed.
  • the mobile state of the terminal itself may be obtained from a positioning method (for example, a GPS positioning method or a base station positioning method), or may be obtained according to the number of cells passing through a certain period of time, or may be obtained according to a sensor capable of sensing the moving speed.
  • a positioning method for example, a GPS positioning method or a base station positioning method
  • the UE After measuring the serving cell and the neighboring cell (which may include different frequency different frequency cells) according to the above method, the UE determines whether the reselection to the neighboring cell should be performed according to the above criteria.
  • the threshold and/or the adjustment factor of the reselection time parameter By appropriately setting the threshold and/or the adjustment factor of the reselection time parameter, the UE is less likely to reselect the carrier frequency with higher frequency at high speed, or the UE is more easily reselected to the lower frequency at high speed. Carrier frequency.
  • the serving carrier frequency that is, the carrier frequency of the cell in which the UE currently camps
  • the UE measures the low priority carrier frequency of 900 Mhz
  • the high priority carrier frequency is 2.4 GHz
  • the base station broadcasts the reselection parameter information.
  • the (basic) threshold and reselection time corresponding to the 900Mhz carrier frequency are indicated, and the reselection parameter information also indicates that the threshold adjustment factor corresponding to the 900Mhz carrier frequency is -3dB and the reselection time adjustment factor is 0.75 at high speed.
  • the threshold for reselecting to 900MHz carrier frequency is lower and the reselection time is shorter, which makes it easier to reselect the 900Mhz carrier frequency band.
  • the reselection parameter information broadcast by the base station indicates that at a high speed, the threshold adjustment factor corresponding to the 2.4 Ghz carrier frequency is 2 dB, and the reselection time adjustment factor is 1.25.
  • the threshold for reselecting to the 2.4 GHz carrier frequency is higher and the reselection time is longer, so that it is less likely to reselect to the 2.4 Ghz carrier frequency cell.
  • the high-speed UE stays in the cell covering the low-frequency carrier frequency with good performance as much as possible, thereby reducing the number of cell reselection, reducing the overhead, and facilitating power saving.
  • the base station may also affect the measurement reporting behavior of the UE under different mobility, thereby improving UE mobility. Performance.
  • the UE in the connected state measures the serving cell and the neighboring cell (which may include the inter-frequency cell), and determines whether to trigger the measurement report according to the measurement report event configured by the base station.
  • the measurement report event configured by the base station includes an A4 event or an A5 event or a B1 event or a B2 event.
  • the entry condition of the A4 event applicable to the E-UTRAN cell is the inequality Mn+Ofii+Ocn-hys>Thresh, and the leaving condition is the inequality Mn+Ofii+Ocn+hys ⁇ Thresh.
  • the entry condition for the B1 event applicable to the heterogeneous cell is The inequality Mn+Ofii-hys>Thresh, leaving the condition is the inequality Mn+Ofii+hys ⁇ Thresh.
  • the entry conditions for the A5 event applicable to the E-UTRAN cell are the inequalities Mp+hys ⁇ Thresh and Mn+0fii+0cn-hys>Thresh2, and the leaving condition is the inequality Mp-hys>Thresh and Mn+Ofii+Ocn+hys ⁇ Thresh2,
  • the entry conditions for the B2 event applicable to the heterogeneous cell are the inequalities Mp+hys ⁇ Thresh and Mn+0 -hys>Thresh2, and the leaving condition is the inequality Mp-hys>Thresh and Mn+0 +hys ⁇ Thresh2.
  • Mn and Mp are measured values of signals of the UE to the neighboring cell and the primary serving cell, where 0 is the carrier frequency offset of the target carrier frequency (the carrier frequency used by the measured neighboring cell), and Ocn is the cell offset of the neighboring cell.
  • Quantity, hys is a factor of 4
  • Thresh Thresh2 is an event-related threshold.
  • the UE uses the corresponding threshold parameters according to its own mobile state and the target carrier frequency when using Thresh or Thresh2.
  • the base station transmits different mobile states through the measurement configuration (for example, The threshold parameter corresponding to the adjacent carrier frequency at low speed, medium speed, high speed), or the measurement configuration information sent by the base station includes basic threshold parameters for each carrier frequency, and the basic threshold parameter of the corresponding carrier frequency can be directly used at low speed, and At medium speed and high speed, it is necessary to operate according to the Scaling Factor parameter of each carrier frequency corresponding to the medium speed and high speed in the measurement configuration information, and the UE adjusts the threshold of the medium speed or high speed of a certain carrier frequency. The factor is added to the basic threshold parameter of the carrier frequency to obtain a threshold parameter corresponding to the medium speed or the high speed.
  • the indication event in the measurement configuration information sent by the base station is an A4 event
  • the (basic) threshold corresponding to the 1800 Mhz carrier frequency is OdB
  • the configuration information is measured.
  • the middle indicates that at high speed, the threshold adjustment factor corresponding to the 1800Mhz carrier frequency is 3dB.
  • the actual threshold Thrre used is 3 dB.
  • the mobile state of the terminal itself can be from the positioning side
  • the method (for example, the GPS positioning method or the base station positioning method) is obtained, and may also be obtained according to the number of cells passing through a certain period of time, or may be obtained according to a sensor capable of sensing the moving speed.
  • the UE is less likely to reselect the carrier frequency with higher frequency at high speed, thereby enabling the high-speed UE to use the covered low-frequency carrier frequency as much as possible, thereby reducing the number of handovers and the handover failure rate, and reducing overhead, and Conducive to saving electricity.
  • the base station may also configure different parameters for the UE according to the mobile state of the UE, so that after receiving the parameters configured by the base station, the UE may directly use the parameter. Measurement processing.
  • the base station may also affect the measurement reporting behavior of the UE under different mobility, thereby improving the UE's mobile performance.
  • FIG. 7 is a third specific flow chart of the first embodiment of the present invention. As shown in Figure 7, the following steps are included.
  • Step 701 The UE receives the priority information that is sent by the base station and corresponds to a specific carrier frequency under a specific mobility.
  • step 702 the UE determines its own mobility. If it is high speed, step 703 is performed. If it is medium speed, step 704 is performed. If it is low speed, step 705 is performed.
  • Step 703 The UE evaluates the inter-frequency (including heterogeneous) cell by using the priority parameter of the corresponding carrier frequency at a high speed, and the process ends.
  • Step 704 The UE evaluates the inter-frequency (including heterogeneous) cell by using the priority parameter of the corresponding carrier frequency at the medium speed, and the process ends.
  • Step 705 The UE evaluates the inter-frequency (including heterogeneous) cells by using the priority parameters of the corresponding carrier frequencies at a low speed, and the process ends.
  • the UE After the UE in the idle (Idle) state measures the serving cell and the inter-frequency cell (including the heterogeneous cell), the UE usually performs reselection evaluation or judgment according to the criteria in Example 4. As example 4 The UE needs to use a different frequency/heterogeneous priority parameter when deciding whether to perform reselection to the inter-frequency/heterogeneous cell. Considering the impact of different mobile speeds of the UE on different carrier frequencies, the UE uses corresponding priority parameters according to its own mobile state and target carrier frequency when performing reselection evaluation.
  • the base station transmits different mobile states through system information (for example, , low speed, medium speed, high speed) the priority parameter corresponding to the adjacent carrier frequency/standard, or the system information sent by the base station includes the basic priority parameter for each carrier frequency, and the base of the corresponding carrier frequency can be directly used at low speed
  • the priority parameter while at medium speed and high speed, it needs to operate according to the Scaling Factor parameter of each carrier frequency corresponding to the medium speed and high speed in the system information, and the UE will medium speed of a certain carrier frequency or
  • the priority adjustment factor at the high speed is added to the base priority parameter of the carrier frequency to obtain a priority parameter corresponding to the medium speed or the high speed.
  • the system information sent by the base station indicates that the priority of 900 MHz is 4, the priority of 1800 Mhz is 5, and the priority of 900 MHz is indicated at high speed.
  • the adjustment factor is +1, and the priority adjustment factor corresponding to the 1800Mhz carrier frequency is -1.
  • the priority of 1800Mhz is lower than the priority of 900Mhz.
  • the UE needs to meet more conditions from 900MHz reselection to 1800Mhz, that is, not only the signal of the target cell is required to be good enough in the reselection time, but also the signal of the monthly service cell is not good enough during the reselection time (Squal ⁇ Threshserving, LOWQ or Srxlev ⁇ Thresh Serving , LowP ).
  • the UE is less likely to reselect to a higher frequency carrier frequency at a high speed, or it is easier to reselect to a lower frequency.
  • the carrier frequency thus, enables the high-speed UE to use the covered low-frequency carrier frequency as much as possible, thereby reducing the number of reselections, reducing the overhead, and contributing to power saving.
  • FIG 8 is a basic flow chart of Embodiment 2 of the present invention. As shown in Figure 8, the following steps are included. Step 801: The UE sets a reselection or measurement parameter for a specific carrier, a specific carrier frequency.
  • Step 802 The UE performs a process of reselection or measurement according to the mobility, the current serving carrier frequency, and/or the reselection or measurement parameter corresponding to the reselected or measured target carrier frequency.
  • the flow shown in Fig. 8 is explained in detail below by way of Example 7.
  • the UE may perform reselection evaluation/judgment according to the criteria in Example 4. As described in Example 4, the UE needs to use the inter-frequency/extra-standard priority parameter when deciding whether to perform re-selection to the inter-frequency/extra-cell. Considering the impact of different mobile speeds of the UE on different carrier frequencies, the UE uses corresponding priority parameters according to its own mobile state and target carrier frequency when performing reselection evaluation.
  • the UE pre-configures different mobile states (for example, low speed) , medium speed, high speed) the priority parameter corresponding to the adjacent carrier frequency/standard, or the pre-configuration of the UE includes the basic priority parameter for each carrier frequency, and the base priority parameter of the corresponding carrier frequency can be directly used at low speed At medium speed and high speed, it is necessary to operate according to the S caling factor parameter of each carrier frequency corresponding to the medium speed and high speed in the pre-configuration, and the UE will use a medium speed or high speed of a certain carrier frequency.
  • the priority adjustment factor is added to the base priority parameter of the carrier frequency to obtain a threshold parameter corresponding to the medium speed or the high speed.
  • the system information sent by the base station indicates that the priority of 900 MHz is 4, the priority of 1800 Mhz is 5, and the priority of 900 MHz is indicated at high speed.
  • the adjustment factor is +1, and the priority adjustment factor corresponding to the 1800Mhz carrier frequency is -1.
  • the mobile state of the terminal itself may be obtained from a positioning method (for example, a GPS positioning method or a base station positioning method), or may be obtained based on the number of cells passing through a certain period of time, or may be obtained according to a sensor capable of sensing the moving speed.
  • the priority of 1800Mhz is lower than the priority of 900Mhz.
  • the UE needs to meet more conditions from 900MHz reselection to 1800Mhz, that is, not only the signal of the target cell is required to be good enough during the reselection time, but also the signal of the serving cell is not good enough during the reselection time (Squal ⁇ Threshservmg , LowQ or Srxlev ⁇
  • Threshservmg LowP
  • the UE is less likely to reselect to a higher frequency carrier frequency at high speed, or it is easier to reselect to a lower frequency carrier.
  • the frequency thus, enables the high-speed UE to use the covered low-frequency carrier frequency as much as possible, thereby reducing the number of reselection, reducing the overhead, and contributing to power saving.
  • the priority is used as an example to clarify the method for the UE to set different priorities for different carrier frequencies according to different moving speeds.
  • the UE can also set different carrier frequency offset parameters and thresholds for different carrier frequencies according to different moving speeds. Parameters, reselection time parameters or trigger time parameters, and hypothesis factor parameters.
  • the specific method is similar to the method in the first embodiment, except that the UE does not set these parameters through the base station, but sets the parameters by a pre-configured method. I will not repeat them here.
  • the embodiment of the present invention further provides a user equipment, as shown in FIG. 9, including:
  • a parameter configuration unit configured to: set reselection and/or measurement configuration parameters at a specific mobility specific carrier frequency, or receive reselection and/or measurement configuration parameters from the base station at the specific mobility specific carrier frequency;
  • a processing unit configured to: perform reselection and/or measurement report processing according to reselection and/or measurement configuration parameters corresponding to mobility of the user equipment, current serving carrier frequency, reselected or measured target carrier frequency .
  • the reselection and/or measurement configuration parameters of the specific carrier frequency under the specific mobility include one or a combination of the following:
  • Reselection time at a specific mobility specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • the mobility includes a mobility capability and/or a mobility state of the user equipment.
  • the reselection and/or measurement configuration parameters satisfy the following conditions:
  • the greater the moving speed the more the carrier frequency is selected to be lower in the optional carrier frequency.
  • the embodiment of the present invention further provides a base station, as shown in FIG. 10, including:
  • the parameter sending unit is configured to: send the reselection and/or measurement configuration parameters at a specific mobility specific carrier frequency to the user equipment.
  • the base station further includes a parameter obtaining unit, and the parameter obtaining unit is configured to acquire reselection and/or measurement configuration parameters in the specific mobility specific carrier frequency from the network management system.
  • the reselection and/or measurement configuration parameters may also be locally configured by the base station.
  • the reselection and/or measurement configuration parameters satisfy the following conditions:
  • the greater the moving speed the more the carrier frequency is selected to be lower in the optional carrier frequency.
  • the reselection and/or measurement configuration parameters of the specific mobility specific carrier frequency include: reselection and/or measurement configuration parameters of the one or more specific carrier frequencies of the plurality of specific mobility.
  • the current mobility of the user equipment is a reselection and/or measurement configuration parameter of one or more specific carrier frequencies.
  • the parameter sending unit is configured to send the reselection and/or measurement configuration parameters in the specific mobility specific carrier frequency by:
  • Reselecting and/or measuring configuration parameters for each particular carrier frequency under mobility as a basis for reselecting and/or measuring configuration parameters for each particular carrier frequency, and for transmitting adjustment factors for each particular carrier frequency under other mobility
  • the user equipment wherein reselection and/or measurement configuration parameters of each specific carrier frequency under other mobility are determined according to a base reselection and/or measurement configuration parameter of each specific carrier frequency and the adjustment factor.
  • the reselection and/or measurement configuration parameters of the specific mobility specific carrier frequency include one or a combination of the following:
  • Reselection time at a specific mobility specific carrier frequency Reselection time at a specific mobility specific carrier frequency.
  • the UE can be different types of devices, including mobile phones, data cards, and user-side devices.
  • Terminals eg, wireless landlines, IoT terminals
  • nomadic terminals eg, laptops
  • low mobility capable terminals eg, WIFI terminals
  • high mobility capable terminals eg, mobile phones.
  • the reselection and/or measurement configuration parameters of different carrier frequencies are configured for different mobility capabilities, such as carrier frequency offset, threshold parameters, carrier frequency priority, set factor, trigger time, and reselection time. Wait. I will not repeat them here.
  • a mobility enhancement method proposed by the embodiment of the present invention by using different cell reselection or measurement parameters for different carrier frequencies and/or systems at different moving speeds, reselection, and/or measurement reporting, And/or the number of handovers, and further reduce the failure rate of reselection or handover, reduce the overhead of the terminal and the network, and also contribute to the power saving of the terminal.

Abstract

La présente invention se rapporte à un procédé d'amélioration de la mobilité comprenant les étapes suivantes : un équipement d'utilisateur configure un paramètre de configuration pour la resélection et/ou la mesure dans des conditions de mobilité spécifique de l'UE et de fréquence porteuse spécifique, ou bien, un équipement d'utilisateur reçoit, d'une station de base, le paramètre de configuration pour la resélection et/ou la mesure dans des conditions de mobilité spécifique de l'UE et de fréquence porteuse spécifique; enfin, en fonction de sa mobilité, ainsi que d'une fréquence porteuse de service courante et du paramètre de configuration pour la resélection et/ou la mesure qui correspond à une fréquence porteuse cible resélectionnée ou mesurée, l'équipement d'utilisateur gère un rapport de resélection ou de mesure. La présente invention se rapporte également à l'équipement d'utilisateur et à la station de base.
PCT/CN2013/070604 2012-01-20 2013-01-17 Procédé d'amélioration de la mobilité, équipement d'utilisateur et station de base WO2013107363A1 (fr)

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