WO2014114164A1 - 无线通信***中的装置和方法 - Google Patents
无线通信***中的装置和方法 Download PDFInfo
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- WO2014114164A1 WO2014114164A1 PCT/CN2013/090514 CN2013090514W WO2014114164A1 WO 2014114164 A1 WO2014114164 A1 WO 2014114164A1 CN 2013090514 W CN2013090514 W CN 2013090514W WO 2014114164 A1 WO2014114164 A1 WO 2014114164A1
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- mobile terminal
- small cell
- location information
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- mobile
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- 238000000034 method Methods 0.000 title claims abstract description 141
- 238000004891 communication Methods 0.000 title claims abstract description 47
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
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- 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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
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- 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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
Definitions
- the present invention generally relates to the field of wireless communications, and more particularly to a universal mobile communication system
- UMTS Long Term Evolution
- LTE-A Long Term Evolution-A
- Mobility enhancement under heterogeneous networks is one of the work items in this field, designed to provide users with seamless and stable coverage while increasing the capacity of the network.
- Mobility enhancement under heterogeneous networks discusses a number of issues, where / Small Cell Detection is one of the hot topics discussed in 3GPP's Work Item heterogeneous network mobility enhancement.
- a heterogeneous network includes a large number of small cells, such as a micro base station, a pico base station, a home base station, and a radio remote unit, which are mainly distributed in homes, offices, shopping centers, and the like. By switching the user to the small cell, the burden on the macro base station is reduced, and the capacity of the network is also increased.
- the current neighbor cell discovery mechanism is to ensure the mobility of the mobile terminal (UE) without considering the new deployment environment under the heterogeneous network.
- the neighbor cell discovery mechanism is based on s-measurement (s-Measure) and reference signal received power (RSRP) and/or reference signal received quality (RSRQ); due to cell distribution under heterogeneous networks
- s-Measure s-measurement
- RSRP reference signal received power
- RSRQ reference signal received quality
- small cell discovery strategies often require the use of measurement gaps. For mobile terminals, frequent configuration of measurement gaps not only consumes power, but also greatly consumes available resources.
- the measurement period is increased to reduce unnecessary measurements, and the high speed mobile terminal is not allowed to access small cells within the hotspot.
- This scheme reduces the power consumption of the mobile terminal side and the interference to the user plane of the serving cell, but the scheme has poor accuracy and there is a discovery delay.
- the inter-frequency cell measurement may be triggered based on Proximity Indication, which may be classified as a macro base station based, small cell based, Or based on mobile terminals.
- the macro base station based scheme and the small cell based scheme do not make any changes on the user plane, but how to improve accuracy is the biggest problem.
- the small cell based solution needs to modify the X2 interface.
- mobile terminal-based solutions are more accurate and more feasible, but add complexity to the mobile terminal side.
- the small cell base station transmits a cell discovery signal (composed of a primary synchronization signal PSS, a secondary synchronization signal SSS, and system information) on a working frequency band of the macro cell.
- a cell discovery signal composed of a primary synchronization signal PSS, a secondary synchronization signal SSS, and system information
- PSS primary synchronization signal
- SSS secondary synchronization signal
- system information system information
- an apparatus in a wireless communication system including: a location information acquiring unit, configured to acquire location information of a mobile terminal; a mobile state evaluating unit, configured to: according to the mobile terminal at different times The location information to evaluate a mobile state of the mobile terminal; and an execution unit configured to perform a corresponding to the small cell discovery according to the location information of the mobile terminal and the change of the mobile state action.
- the location information acquiring unit locates the mobile terminal according to a round-trip time and an angle of arrival obtained by measuring the mobile terminal, to obtain the location information of the mobile terminal, where The round trip time is obtained by the location information acquiring unit using the timing advance information of the mobile terminal to measure the mobile terminal.
- the location information acquiring unit performs measurement on the mobile terminal a plurality of times according to a predetermined sampling period in a predetermined sampling time window to obtain a plurality of the round trip times and the plurality of Arrival angle.
- the position information acquisition unit calculates an error correction factor using the result of the GNSS auxiliary measurement as a reference value, and corrects the positioning using the error correction factor.
- the action related to the small cell discovery performed by the execution unit includes one or more of the following actions: determining the distance according to the distance between the mobile terminal and the small cell Whether the mobile terminal is approaching the small cell, or determining whether the initial condition discovered by the mobile terminal for the small cell is satisfied.
- the moving state evaluation unit is further configured to calculate a moving speed and/or a moving direction of the mobile terminal according to the plurality of pieces of position information of the mobile terminal at different times.
- the plurality of location information of the mobile terminal at different times are obtained according to a predetermined acquisition period
- the executing unit is further configured to: update the mobile terminal according to the current moving speed of the mobile terminal. Get the period.
- the movement state evaluation unit is further configured to divide the moving speed of the mobile terminal into different speed levels, and the execution unit is further configured to adopt an area different from the set.
- the mobile state evaluation unit is further configured to determine a boundary range corresponding to the small cell according to a size of the moving speed of the mobile terminal, and the execution unit is further configured to The distance between the mobile terminal and the small cell is compared with the boundary range to determine whether the mobile terminal is approaching the small cell.
- the mobile state evaluation unit is further configured to divide the small cells adjacent to each other into the same cluster, and obtain a boundary set corresponding to each small cell in the same cluster as a The boundary range corresponding to the same cluster.
- the execution unit is further configured to: if the mobile terminal is outside the boundary range Then, a longer acquisition period is set; if the mobile terminal is within the boundary range, a shorter acquisition period is set.
- the execution unit is further configured to determine, if the mobile terminal is located within the boundary range, whether the initial condition discovered by the mobile terminal for the small cell is satisfied, the initial The condition is one or more of the following: The mobile terminal is in a non-high speed mobile state, the small cell has a good load condition and there are remaining resources for access by the mobile terminal.
- the mobile state evaluation unit is further configured to calculate a dwell time required by the mobile terminal to pass the small cell according to location information, a moving speed, and a moving direction of the mobile terminal, and calculate the The dwell time is compared to a predetermined dwell time threshold to assess whether the mobile terminal is in a non-high speed mobile state.
- the method further includes: an inter-frequency neighbor cell measurement determining unit, configured to determine whether to trigger inter-frequency neighbor cell measurement of the mobile terminal.
- the mobile state evaluation unit is further configured to calculate a reaction time of the mobile terminal to reach a coverage of the small cell according to location information, a moving speed, and a moving direction of the mobile terminal, and
- the inter-frequency neighbor cell measurement determining unit is further configured to compare the calculated reaction time with a predetermined reaction time threshold to determine whether to trigger inter-frequency neighbor cell measurement of the mobile terminal.
- the mobile state evaluation unit is further configured to divide the boundary range into a plurality of sub-regions, each sub-region corresponding to a predetermined trigger probability, and further configured to determine, according to location information of the mobile terminal, a sub-area in which the mobile terminal is located and a corresponding triggering probability thereof; and the inter-frequency inter-cell neighboring cell measurement determining unit is further configured to perform measurement with the neighboring cell according to the determined.
- the method further includes: an inter-frequency neighbor cell access judging unit, configured to report the data according to the measurement of the mobile terminal before the inter-frequency inter-cell measurement of the mobile terminal has been triggered And determining location information of the mobile terminal to trigger inter-frequency cell handover and/or carrier loading of the mobile terminal.
- a method for use in a wireless communication system including: a location information acquisition step of acquiring location information of a mobile terminal; and a mobile state evaluation step, Evaluating a mobile state of the mobile terminal according to the location information of the mobile terminal at different times; and performing steps to perform small and small according to the location information of the mobile terminal and the change of the mobile state
- the cell finds the corresponding action.
- the mobile terminal in the location information obtaining step, is located according to a round trip time and an angle of arrival obtained by measuring the mobile terminal to obtain the location of the mobile terminal.
- Information, wherein the round trip time is obtained by measuring the mobile terminal by using timing advance information of the mobile terminal.
- the mobile terminal in the location information obtaining step, is measured a plurality of times according to a predetermined sampling period in a predetermined sampling time window to obtain a plurality of the round trip times and more The angle of arrival.
- the error correction factor is calculated using the result of the GNSS auxiliary measurement as a reference value, and the positioning is corrected using the error correction factor whil
- the action related to the small cell discovery performed in the performing step includes one or more of the following actions: determining the location according to the distance between the mobile terminal and the small cell Whether the mobile terminal is approaching the small cell, or determining whether the initial condition discovered by the mobile terminal for the small cell is satisfied.
- the moving speed and/or the moving direction of the mobile terminal are also calculated based on the plurality of location information of the mobile terminal at different times.
- the plurality of location information of the mobile terminal at different times are obtained according to a predetermined acquisition period, and in the performing step, updating the acquisition of the mobile terminal according to the current moving speed of the mobile terminal. cycle.
- the moving speed of the mobile terminal is further divided into different speed levels in the moving state evaluation step, and an area different from the set is also adopted in the performing step .
- a boundary range corresponding to the small cell is further determined according to a size of the moving speed of the mobile terminal, and in the performing step, It is also determined whether the mobile terminal is approaching the small cell by comparing a distance between the mobile terminal and the small cell with the boundary range.
- the plurality of location information of the mobile terminal at different times are obtained according to a predetermined acquisition period, and in the performing step, if the mobile terminal is outside the boundary range, Then, a longer acquisition period is set; if the mobile terminal is within the boundary range, a shorter acquisition period is set.
- the performing step if the mobile terminal is located within the boundary range, it is determined whether the initial condition discovered by the mobile terminal for the small cell is satisfied,
- the initial ⁇ is one or more of the following:
- the multi-terminal is in a non-high-speed mobile state, the small cell has a good load condition and there are remaining resources for access by the mobile terminal.
- the staying time required by the mobile terminal to pass the small cell is further calculated according to the location information, the moving speed, and the moving direction of the mobile terminal, and The calculated dwell time is compared to a predetermined dwell time threshold to assess whether the mobile terminal is in a non-high speed mobile state.
- the method further includes: an inter-frequency neighbor cell measurement and determining step, determining whether to trigger the inter-frequency inter-cell measurement of the mobile terminal.
- the reaction time of the mobile terminal to reach the coverage of the small cell is further calculated according to the location information, the moving speed, and the moving direction of the mobile terminal, And in the inter-frequency inter-cell neighboring cell measurement determining step, comparing the calculated reaction time with a predetermined reaction time threshold to determine whether to trigger inter-frequency neighbor cell measurement of the mobile terminal.
- the boundary range is further divided into a plurality of sub-regions, each sub-region corresponding to a predetermined trigger probability, and further used for determining location information according to the mobile terminal Determining a sub-area in which the mobile terminal is located and a corresponding triggering probability thereof; and in the inter-inter-frequency neighbor cell measurement determining step, further measuring according to the determined inter-frequency neighboring cell.
- the method further includes: an inter-frequency neighbor cell access judging step, in the case that the inter-frequency inter-cell measurement of the mobile terminal has been triggered, according to the measurement report and the mobile terminal of the mobile terminal.
- the location information of the terminal is used to determine whether to trigger the inter-frequency cell handover and/or the loading of the mobile terminal.
- an apparatus in a wireless communication system comprising: an angle of arrival measuring unit for measuring an angle of arrival of a signal transmitted from a mobile terminal to a base station; and a round trip time measuring unit, And a positioning unit configured to perform positioning on the mobile terminal according to the angle of arrival and the round trip time, where The round trip time measuring unit measures the round trip time by using the timing advance of the mobile terminal to measure the round trip time.
- the method further includes: a receiving unit, configured to receive global navigation satellite system positioning information reported by the mobile terminal; and a correcting unit, configured to calculate an error correction factor by using the global navigation satellite system positioning information as a reference value, And correcting the positioning using the error correction factor.
- a method for use in a wireless communication system comprising: an angle of arrival measurement step of measuring an angle of arrival of a signal transmitted from a mobile terminal to a base station; a round trip time measuring step, measuring the a round trip time required for a signal to travel back and forth between the mobile terminal and the base station; and a positioning step of locating the mobile terminal according to the angle of arrival and the round trip time, wherein the round trip time is measured
- the mobile terminal is measured by the timing advance of the mobile terminal to obtain the round trip time.
- the method further includes: a receiving step of receiving global navigation satellite system positioning information reported by the mobile terminal; and a correcting step of calculating an error correction factor by using the global navigation satellite system positioning information as a reference value, and using the The error correction factor corrects the positioning.
- ⁇ ⁇ computer instructions for causing a computer to perform: a location information acquisition step, obtaining location information of the mobile terminal; a mobile state evaluation step, evaluating the mobile terminal's mobile state based on the location information of the mobile terminal at different times And performing steps to perform a corresponding action related to the small cell discovery according to the location information of the mobile terminal and the change of the mobile state.
- ⁇ computer instructions for causing a computer to perform: an angle of arrival measurement step, measuring an angle of arrival of a signal transmitted from the mobile terminal to the base station; a round trip time measuring step of measuring the signal between the mobile terminal and the base station a required round trip time; and a positioning step of locating the mobile terminal according to the angle of arrival and the round trip time, wherein in the round trip time measuring step, the timing advance amount of the mobile terminal is utilized
- the mobile terminal performs measurement to obtain the round trip time.
- FIG. 1 is a block diagram showing a configuration of an apparatus in a wireless communication system according to an embodiment of the present invention
- Figure 2 is a diagram showing the type 1 for measuring the round trip time and the manner for measuring the round trip time according to an embodiment of the present invention
- FIG. 3 is a schematic diagram showing a coverage area of a divided base station according to an embodiment of the present invention
- FIG. 4 is a schematic diagram showing evaluation of a movement state of a mobile terminal according to an embodiment of the present invention
- FIG. A block diagram of another configuration of a device in a wireless communication system
- FIG. 6 is a block diagram showing still another configuration of an apparatus in a wireless communication system according to an embodiment of the present invention.
- FIG. 7 is a flow chart showing a method for use in a wireless communication system according to an embodiment of the present invention.
- FIG. 8 is a flow chart showing a method for use in a wireless communication system in accordance with another embodiment of the present invention.
- FIG. 9 is a flow chart showing a method for use in a wireless communication system in accordance with another embodiment of the present invention.
- FIG. 10 is a block diagram showing a configuration of an apparatus in a wireless communication system according to another embodiment of the present invention.
- FIG. 11 is a flow chart showing a method for use in a wireless communication system according to another embodiment of the present invention.
- FIG. 12 is a schematic block diagram showing an information processing apparatus that can be used as an implementation according to an embodiment of the present invention. detailed description
- FIG. 1 is a block diagram showing the configuration of an apparatus in a wireless communication system according to an embodiment of the present invention.
- the device 100 in the wireless communication system may include a location information acquisition unit 102, a mobility state evaluation unit 104, and an execution unit 106.
- the location information acquisition unit 102 can acquire location information of the mobile terminal.
- the location information of the mobile terminal is one of important information provided to the network side. According to the location information of the mobile terminal, the network side can perform the process of small cell discovery more accurately.
- the location information acquiring unit 102 can acquire location information of the mobile terminal in various manners.
- the location information acquisition unit 102 can obtain location information of the mobile terminal by locating the mobile terminal.
- the location information acquiring unit 102 may acquire location information of the mobile terminal by receiving Global Navigation Satellite System (GNSS) measurement results reported by the mobile terminal, where the Global Navigation Satellite System (GNSS) may be, for example, a global positioning system ( GPS).
- GNSS Global Navigation Satellite System
- GPS global positioning system
- the location information acquiring unit 102 may locate the mobile terminal according to the round-trip time and the angle of arrival obtained by measuring the mobile terminal, to obtain location information of the mobile terminal, where the round-trip time is obtained by the location information.
- the unit 102 obtains the measurement of the mobile terminal by using the timing advance information of the mobile terminal.
- a variety of methods for locating mobile terminals are defined in 3GPP 36.305, such as network side assisted GNSS (A-GNSS), downlink positioning, E-CID (Enhanced Cell ID Positioning), and uplink positioning.
- A-GNSS network side assisted GNSS
- E-CID Enhanced Cell ID Positioning
- uplink positioning may have different implementation manners, as shown in Table 1. Table 1 - Different methods for locating mobile terminals
- the E-CID uses the geographic knowledge of the serving cell of the mobile terminal.
- measurements made by the mobile terminal and/or the eNodeB may additionally be employed.
- the mobile terminal can be located according to the round trip time (RTT, Round Trip Time) and the angle of arrival (AoA, Angle of Arrival) measured on the mobile terminal.
- RTT Round Trip Time
- AoA Angle of Arrival
- the present invention uses the E-CID to measure the round trip time and the angle of arrival implementation to locate the mobile terminal.
- the round trip time and the angle of arrival are measured at the base station side.
- the distance between the mobile terminal and the base station can be determined.
- the angle of arrival the direction between the mobile terminal and the base station can be determined.
- the relative position between the mobile terminal and the base station can be obtained. Since the round-trip time and the angle of arrival are measured at the base station side, the process of locating the mobile terminal can be simplified, and compatibility with existing standards can be achieved without adding an additional burden to the mobile terminal.
- the angle of arrival can be measured in a variety of ways.
- the antenna array on the base station side can track the uplink signal sent by the mobile terminal, and measure the arrival angle of the uplink signal, thereby determining the direction between the mobile terminal and the base station.
- the uplink signal sent by the mobile terminal may be an SRS signal or a DM-RS signal or the like.
- the round trip time can be determined based on the time at which the mobile terminal or base station measures the transmission/reception of the nth subframe.
- Two ways to measure round trip time namely Type 1 and Type 2, are defined in 3GPP 36.305. Table 2 below compares Type 1 and Type 2 used to measure the round trip time. Table 2 - Comparison of Type 1 and Type 2 for measuring round trip time
- Type 2 for measuring round trip time the base station acquires a round trip time by triggering a dedicated random access procedure to measure the arrival time of a pilot signal transmitted by the mobile terminal.
- the time at which the mobile terminal transmits the pilot signal is based on the time at which the mobile terminal receives the downlink signal without transmitting in advance. Therefore, the time at which the pilot signal transmitted by the mobile terminal arrives at the base station is twice the one-way transmission delay. It can be seen that the implementation of Type 2 for measuring the round trip time is simpler, and the base station can independently measure and locate the mobile terminal, but needs to use the PRACH channel.
- FIG. Fig. 2 is a schematic diagram showing the type 1 for measuring the round trip time and the manner for measuring the round trip time according to an embodiment of the present invention.
- the horizontal axis represents time T.
- the time t1 indicates the time when the mobile terminal transmits the nth subframe
- the time t2 indicates the time when the base station transmits the nth subframe
- the time t3 indicates the time when the base station receives the nth subframe
- the time t4 indicates the time when the mobile terminal receives the nth subframe.
- the round-trip time RTT is equal to the time difference (13 -12) between the time t3 at which the base station receives the n-th subframe and the time t2 at which the base station transmits the n-th subframe, or the mobile terminal receives the n-th child
- the time difference (t4-tl) between the time t4 of the frame and the time t1 at which the mobile terminal transmits the nth subframe, that is, RTT ((t3-t2) + (t4-tl))/2.
- the round-trip time RTT obtained by the method for measuring the round-trip time according to the embodiment of the present invention is equal to the time difference between the time t3 at which the base station receives the n-th subframe and the time t2 at which the base station transmits the n-th subframe (t3 - t2) ) plus timing advance TA. Therefore, according to the method for measuring the round-trip time according to the embodiment of the present invention, the base station can separately perform the measurement of the round-trip time using the timing advance TA information of the mobile terminal without the assistance of the mobile terminal.
- the manner for measuring the round trip time according to the embodiment of the present invention is not limited to the pilot signal used in the PRACH channel, and thus is more widely applicable than the type 2 for measuring the round trip time.
- the location information acquisition unit 102 may measure the mobile terminal a plurality of times to obtain a plurality of back times and a plurality of angles of arrival in a predetermined sampling time window according to a predetermined sampling period.
- a period of time can be set in advance as the sampling time window.
- the mobile terminal is measured a plurality of times in accordance with a predetermined sampling period to obtain a plurality of round trip times and a plurality of angles of arrival.
- the base station needs to acquire location information of the mobile terminal.
- the base station configures a sampling time window at time t, the duration of the sampling time window being ⁇ ⁇ .
- the base station measures the mobile terminal multiple times with T s as the sampling period to obtain multiple round trip times and multiple arrival angles.
- ⁇ ⁇ is small enough, the distance that the mobile terminal moves within the sampling time window is not large.
- the signals arriving with the least time are often subjected to fewer reflections, more likely to be direct paths, or near direct paths.
- the location of the mobile terminal at time t can be determined by removing the bad value points from the measured multiple round trip times and the multiple arrival angles to obtain n times after removing the bad value points.
- the minimum value in n ⁇ is taken as the final round trip time RTT F , ie RTTp ⁇ miniRTT!, RTT 2 , RTT n ⁇ ;
- the average of the n arrival angles ⁇ ⁇ l ⁇ 2 , ..., ⁇ ⁇ ⁇ is calculated as the final arrival Angle AoA F , ie ..., ⁇ ⁇ ⁇ ;
- the position of the mobile terminal at time t can be determined.
- the above sampling time window can be set according to the following principle: the length of the set sampling time window should be appropriate, because: If the length of the sampling time window is set too long, the base station resources will be occupied excessively. Moreover, the measurement is not accurate; in addition, if the length of the sampling time window is set too short, the purpose of improving the accuracy of the positioning cannot be achieved.
- the position information acquisition unit 102 calculates an error correction factor using the result of the global navigation satellite system auxiliary measurement as a reference value, and corrects the positioning using the error correction factor.
- the GNSS positioning method has the characteristics of high accuracy.
- more and more mobile terminals have the functions of global navigation satellite systems. Therefore, according to an embodiment of the present invention, the positioning error of the round trip time can be corrected by using the measurement result of the global navigation satellite system, thereby further improving the accuracy of positioning the mobile terminal.
- the error correction factor P RTT can be calculated using the measurement result of the global navigation satellite system as a standard value, and the positioning performed using the round trip time is corrected using the calculated error correction factor P RTT .
- the scenario of using a global navigation satellite system is not limited to this.
- the location information acquiring unit 102 can acquire the location information of the mobile terminal by receiving the Global Navigation Satellite System (GNSS) measurement result reported by the mobile terminal, wherein the global navigation satellite system (GNSS) can be, for example, a Global Positioning System (GPS).
- GNSS Global Navigation Satellite System
- GPS Global Positioning System
- the base station may also request the mobile terminal to immediately report the measurement result of the global navigation satellite system.
- the base station when the mobile terminal is located at the base station by using the angle of arrival and the round trip time, the base station sends a positioning request, and the base station end independently completes the measurement of the angle of arrival and the round trip time, thereby implementing the mobile terminal. Positioning. Therefore, according to the positioning method of the embodiment of the present invention, the process of positioning the mobile terminal can be simplified, and the network signaling resource is reduced. The source is occupied, and the corresponding delay is not generated, thereby improving the efficiency of positioning the mobile terminal.
- the above manner of positioning the mobile terminal is merely exemplary, and other methods for positioning the mobile terminal may also be adopted.
- the above method of positioning the mobile terminal can be applied to other occasions.
- the foregoing method for positioning a mobile terminal can also be applied to the following situations: for providing emergency ambulance, positioning of a mobile terminal in an emergency call scenario; for providing location-based information services, such as navigation information and tour guide services, etc. Services for location triggering, such as location-based management and billing; for tracking and property management, vehicle scheduling/tracking, logistics monitoring, elderly/child care services, etc.
- the mobile state evaluation unit 104 in the device 100 can evaluate the mobile state of the mobile terminal based on the location information of the mobile terminal at different times.
- the mobile state evaluation unit 104 may obtain a plurality of location information of the mobile terminal at different times according to the foregoing method for acquiring location information of the mobile terminal. For example, the mobility state evaluation unit 104 may acquire, respectively, the position information of Pl mobile terminal at the time, at time t the position information p 2 2, ... at time ⁇ location Pl at time tj location ft at a time t position n Information p n , where i, j and n are natural numbers, and l ⁇ i ⁇ n, l ⁇ j ⁇ n.
- the time period ( t r tj ) between the two times can be obtained according to the time ⁇ and the time tj, and the distance ( P- Pj ) of the mobile terminal moving within the time period ( t r tj ) is obtained according to the position information P1 and the position information.
- the mobile terminal's mobile state can be evaluated, for example, the mobile terminal is Whether to move at high speed, medium speed or low speed, or whether the mobile terminal is moving toward a small cell or leaving a small cell, and the like.
- the mobile state evaluation unit 104 is further configured to calculate a moving speed and/or a moving direction of the mobile terminal according to the plurality of location information of the mobile terminal at different times.
- the mobile terminal can obtain the time period (t r tj) The speed of movement inside.
- a curve fitting or prediction method may be used to estimate the movement trajectory of the mobile terminal, thereby estimating the moving direction of the mobile terminal.
- the mobile terminal can also use the positioning information of the global navigation satellite system to calculate the total distance that the mobile terminal moves within a given time interval, and by giving the mobile terminal a given The total distance moved within the time interval divided by the given time interval can also be used to obtain the moving speed of the mobile terminal during the given time interval.
- the execution unit 106 in the device 100 can perform a corresponding action related to small cell discovery based on the location information of the mobile terminal and the change in the mobile state.
- whether to perform small cell discovery is related to the distance of the mobile terminal from the small cell. If the mobile terminal is far from the small cell, the probability that the mobile terminal may be a small cell is small, so only a rough evaluation of the mobile state of the mobile terminal is required. If the mobile terminal is closer to the small cell, the probability that the mobile terminal may enter the small cell is greater, so a more accurate assessment of the mobile terminal's mobile state may be required to initiate the process of small cell discovery when appropriate.
- the action related to small cell discovery performed by the execution unit 106 includes one or more of the following actions: determining whether the mobile terminal is based on a distance between the mobile terminal and the small cell The small cell is approaching, or it is determined whether the initial condition discovered by the mobile terminal for the small cell is satisfied.
- the process of small cell discovery needs to be started at an appropriate time.
- the distance between the mobile terminal and the small cell may be calculated according to the location information of the mobile terminal, and the mobile terminal is determined according to the calculated distance between the mobile terminal and the small cell. Whether it is approaching a small cell. When the mobile terminal properly approaches the small cell, it can be considered that the process of starting the small cell discovery at this time is appropriate.
- the process of small cell discovery when the process of small cell discovery is started, it may be judged whether the initial condition discovered by the mobile terminal for the small cell is satisfied.
- the initial condition for small cell discovery is one or more of the following: the mobile terminal is in a non-high speed mobile state, the load condition of the small cell is good and there are remaining resources for access by the mobile terminal.
- the plurality of location information of the mobile terminal at different times are obtained according to a predetermined acquisition period
- the execution unit 106 is further configured to: update the acquisition period of the mobile terminal according to the current moving speed of the mobile terminal.
- the base station may acquire multiple location information of the mobile terminal according to a predetermined acquisition period. For example, the base station may acquire the location information of the mobile terminal once every 500 ms.
- the length of the foregoing acquisition period is adjustable. For example, the length of the acquisition period may be adjusted according to the current moving speed of the mobile terminal. For example, if the moving speed of the mobile terminal is larger, the location information of the mobile terminal changes faster, so the acquisition period can be set shorter; if the mobile terminal moves The smaller the moving speed is, the slower the position information of the mobile terminal changes, so the longer the acquisition period can be set.
- the length of the acquisition period can also be adjusted according to other factors.
- FIG. 3 is a schematic diagram showing a coverage area of a divided base station according to an embodiment of the present invention.
- the mobile state evaluation unit 104 is further configured to determine a boundary range corresponding to the small cell according to the size of the mobile terminal, and the execution unit 106 is further configured to use the mobile terminal and the small cell. The distance is compared with the boundary range to determine whether the mobile terminal is approaching the small cell.
- the mobile state evaluation unit 104 can calculate the moving speed of the mobile terminal based on the plurality of location information of the mobile terminal at different times. After calculating the moving speed of the mobile terminal, the mobile state evaluating unit 104 can determine the boundary range corresponding to the small cell according to the magnitude of the moving speed of the mobile terminal.
- the boundary range corresponding to the small cell is used to measure the proximity of the mobile terminal to the small cell, and the mobile terminal cannot successfully receive the signal of the small cell within the boundary, but it is likely to be close to the small cell, respectively For mobile terminals with different moving speeds, the same small cell has different boundary ranges.
- the movement state evaluation unit 104 may divide the moving speed of the mobile terminal into different levels such as high speed, medium speed, and low speed, and the different speeds of the respective levels correspond to different boundary ranges, respectively.
- the moving speed of the mobile terminal is at a high speed level, its corresponding boundary range is large; if the moving speed of the mobile terminal is at a low speed level, its corresponding boundary range is small; if the moving speed of the mobile terminal is in the middle The speed level, the corresponding boundary range is between the larger boundary range and the smaller boundary range.
- the mobile state evaluation unit 104 may perform more detailed monitoring of the mobile terminal within the boundary to evaluate its mobile state and calculate the handover reaction time of the mobile terminal. Therefore, if the boundary range is determined to be larger, the mobile terminal close to the small cell can be finely monitored earlier, and thus the accuracy of the mobile state evaluation is correspondingly improved, but the mobile state evaluation unit 104 The processing load will also increase accordingly, so the boundary range needs to be determined to be an appropriate size to achieve a compromise between the accuracy of the mobile terminal evaluation and the processing load. In addition, the boundary range is still > mm
- the current location of the mobile terminal is A (x a y a ), and the moving direction of the mobile terminal (ie, the angle between the arrow indicating the forward direction of the mobile terminal and the horizontal line in FIG. 4) is ⁇ , the mobile terminal
- the moving speed at position A (x a , y a ) is v.
- the deployment location of the small cell ie, the deployment location of the access point of the small cell
- O the radius of the coverage of the small cell
- the handover reaction time t react of the mobile terminal is equal to the coverage range of the mobile terminal from the current location A (x a , y a ) to the small cell according to the current moving speed V and the moving direction ⁇ (ie, in FIG. 4 Point B) time, and the mobile terminal is at the boundary
- the minimum handover response time of the mobile terminal is ⁇ . "'. "It can be determined experimentally.
- the boundary range corresponding to the small cell is a circle centered on the access point of the small cell.
- the effect of the boundary range may not be a standard circle.
- the use of a circle to approximate the boundary range corresponding to the small cell is only for the purpose of simplifying the modeling, and of course other The shape is to approximate the boundary range corresponding to the small cell.
- the mobile terminal After determining the boundary range corresponding to the small cell, it can be judged whether the mobile terminal is approaching the small cell by comparing the distance between the mobile terminal and the small cell (small cell access point) with the boundary range. For example, if the distance between the mobile terminal and the small cell is less than or equal to the boundary range, the mobile terminal is located within the boundary, which means that the mobile terminal is approaching the small cell. In addition, if the distance between the mobile terminal and the small cell is greater than the boundary range, the mobile terminal is outside the boundary range, which means that the mobile terminal is far from the small cell and is not approaching the small cell.
- the mobile state evaluation unit 104 is further configured to divide the small cells adjacent to each other into the same cluster, and combine the boundary ranges corresponding to the respective small cells in the same cluster as the same The boundary range corresponding to the cluster.
- the mobile state evaluation unit 104 may divide the small cells that are closer to each other into the same cluster. For each small cell in the cluster, the boundary range corresponding thereto is determined respectively. Then, the determined boundary ranges are summed as the boundary range corresponding to the same cluster. In this case, the resulting boundary range corresponding to the same cluster is no longer circular.
- the mobile state evaluation unit 104 may also determine the coverage of the small cell according to the signal quality of the small cell.
- the coverage of a small cell generally refers to an area in which a mobile terminal can normally receive signals of a small cell and obtain a normal quality of service.
- the mobile terminal evaluation unit 104 can determine the received signal strength and/or carrier interference noise ratio of the small cell.
- the coverage of the small cell Specifically, a value of the signal quality may be defined as a threshold of the coverage of the small cell, and the threshold may be a value of the signal quality of the small cell when the mobile terminal triggers the measurement of the handover.
- the coverage of the small cell is determined.
- the signal quality distribution of the small cell can be measured either in advance during actual deployment or from the measurement report of the mobile terminal.
- the coverage of the small cell is also related to the transmission power of the small cell.
- the coverage of a small cell is also a circle centered on an access point of a small cell.
- the coverage of the small cell is concentric with the above-mentioned boundary range, and the radius of the coverage is smaller than the radius of the boundary range.
- the coverage of the small cell may not be a standard circle, and the radius of the coverage of the small cell may also be different from the reference value given in the standard.
- the use of a circle to approximate the coverage of a small cell is merely for the purpose of simplifying modeling, although other shapes may be employed to approximate the coverage of the small cell.
- the mobile state evaluation unit 104 is further configured to divide the moving speed of the mobile terminal into different speed levels
- the executing unit 106 is further configured to adopt the zoning standard corresponding to the speed level of the mobile terminal to move The location where the terminal is located is classified into different areas.
- the location where the mobile terminal is located may be classified into different areas by using the area division standard corresponding to the speed level of the mobile terminal.
- the mobile state evaluation unit 104 may divide the moving speed of the mobile terminal into three levels such as high speed, medium speed, and low speed, and the execution unit 106 may adopt the area dividing standard corresponding to the high speed level, the medium speed level, and the low speed level, respectively.
- the location where the mobile terminal is located is classified into different areas.
- the coverage area of the base station may be divided into the outer area a1, the middle area bl, and the inner area cl according to the distance from the small cell, that is, the mobile terminal
- the area division standard corresponding to the high-speed level is the outer area a1, the intermediate area b1, and the inner area cl; if the moving speed of the mobile terminal belongs to the medium-speed level, the coverage area of the base station can be from far to near according to the distance from the small cell.
- the ground is divided into an outer area a2, an intermediate area b2, and an inner area c2, that is, an area division standard corresponding to a medium speed level of the mobile terminal is an outer area a2, an intermediate area b2, and an inner area c2; and if the moving speed of the mobile terminal belongs to a low speed level, Then, the coverage area of the base station can be divided into the outer area a3, the middle area b3, and the inner area c3 according to the distance from the small cell, that is, the area division standard corresponding to the low speed level of the mobile terminal is the outer area a3, the middle a region b3 and an inner region c3, wherein the outer regions a1, a2, and a3 are located outside a boundary range corresponding to the small cell (outer range shown in FIG. 3), and the intermediate regions b1, b2, and b3 are located corresponding to the small cell
- the boundary range is between the coverage of the small cell, and the internal areas cl, c2, and c3 are
- the coverage of the small cell is the same, that is, for the different levels of the moving speed of the mobile terminal being high speed, medium speed, and the divided internal area.
- the radii of cl, c2 and c3 can be the same.
- the boundary range corresponding to the mobile terminal whose moving speed is at the high speed level is large, the mobile terminal whose moving speed is at the low speed level corresponds to a smaller boundary range, and the mobile terminal whose moving speed is at the medium speed level is The corresponding boundary range is between the larger boundary range and the smaller boundary range, so the intermediate areas bl, b2 and b3 are divided for different levels of high speed, medium speed and low speed of the mobile terminal.
- the mobile state evaluation unit 104 can evaluate the mobile state of the terminal, and can calculate the moving speed and/or the moving direction of the mobile terminal based on the plurality of location information of the mobile terminal at different times. After calculating the moving speed of the mobile terminal, it may be determined which of the different speed levels the calculated moving speed of the mobile terminal belongs to, thereby determining to adopt the area dividing criterion corresponding to the speed level of the mobile terminal.
- the mobile terminal's mobile state changes, for example, the mobile terminal's moving speed changes to belong to a different speed level
- the corresponding zoning criteria may be changed accordingly.
- the mobile terminal can be classified into different regions according to the distance between the mobile terminal and the access point of the small cell. And set different location update strategies for different areas. For example, if the moving speed of the mobile terminal is a high speed level, it may be determined that the area dividing standard corresponding to the high speed level of the mobile terminal is the outer area a1, the intermediate area b1, and the inner area cl.
- the distance D between the mobile terminal and the small cell can be compared with the radius 1 ⁇ of the intermediate region bl and the radius R cl of the internal region, respectively, and the location where the mobile terminal is located is classified according to the result of the comparison.
- Area Specifically, if ER cl , the location where the mobile terminal is located is classified as an internal region; if R cl ⁇ D ⁇ ; R bl , the location where the mobile terminal is located is classified as an intermediate region; and if al > D > R Bl , the position where the mobile terminal is located is classified as the outer area (the outer range shown in Fig. 3).
- the moving speed of the mobile terminal is similar in principle, and details thereof will not be described again.
- the base station When the mobile terminal is located in the outer area, for example, the mobile terminals at times t1, t2, t3, and t4 as shown in FIG. 3, since the mobile terminal is far away from the small cell, the base station only needs to update the mobile at intervals.
- the location information of the terminal may be calculated according to the plurality of location information of the mobile terminal.
- the mobile terminal When the mobile terminal is located in the middle area, for example, the mobile terminal at time t5 as shown in FIG. 3, the terminal is located within the boundary of the small cell, but has not entered the coverage of the small cell, which means that the mobile terminal At this time, the small cell is already approached, and it is very likely that the internal area (ie, the coverage of the small cell) is continued.
- the base station needs to obtain the location information of the mobile terminal and the change of the mobile state more accurately to determine whether the coverage of the small cell is to be In order to trigger the inter-frequency neighbor cell measurement process of the mobile terminal when the mobile terminal is found to be close to the internal area (ie, the coverage of the small cell).
- the inter-frequency inter-cell measurement process of the mobile terminal may have been triggered, so the base station will only refer to the mobile terminal.
- the advertisement status of the obituary and the mobile terminal is measured, and the inter-frequency cell handover process and/or the carrier loading process of the mobile terminal are triggered at an appropriate timing.
- the plurality of location information of the mobile terminal at different times are obtained according to a predetermined acquisition period
- the execution unit 106 is further configured to: if the mobile terminal is outside the boundary range, set a longer Acquisition period; if the mobile terminal is within the boundary, set a shorter acquisition period.
- the base station may acquire multiple location information of the mobile terminal according to a predetermined acquisition period. For example, the base station may acquire the location information of the mobile terminal once every 500 ms.
- the length of the foregoing acquisition period is adjustable. For example, the length of the acquisition period may be adjusted according to the actual location where the mobile terminal is located. Specifically, as shown in FIG. 3, when the mobile terminal is located outside the boundary range, that is, when the mobile terminal is located in the outer range, since the mobile terminal is far away from the small cell, The base station only needs to obtain the rough location information of the mobile terminal, so the acquisition period can be set longer.
- FIG. 3 when the mobile terminal is located outside the boundary range, that is, when the mobile terminal is located in the outer range, since the mobile terminal is far away from the small cell.
- the base station needs to obtain the position information of the mobile terminal and the change of the mobile state more accurately to determine. Whether a small cell is found, so the acquisition period can be set to be shorter.
- the length of the acquisition cycle may be adjusted according to the moving speed of the mobile terminal. For example, if the moving speed of the mobile terminal is larger, the location information of the mobile terminal changes faster, so the acquisition period can be set shorter; if the moving speed of the mobile terminal is smaller, the position information of the mobile terminal changes more slowly. , so the longer the acquisition cycle can be set.
- the length of the acquisition period can also be adjusted according to other factors.
- the executing unit 106 is further configured to determine whether the initial condition of the mobile terminal for small cell discovery is satisfied if the mobile terminal is located within a boundary range, where the initial condition is one or more of the following The mobile terminal is in a non-high-speed mobile state, and the load of the small cell is good and there are remaining resources for access by the mobile terminal.
- the initial condition found by the small cell may be one or more of the above.
- small cells are mainly deployed in densely populated areas, such as supermarkets, shopping malls, offices, etc.
- the main purpose is to share the services of the base station. Therefore, if high-speed mobile terminals appear in the above-mentioned densely populated areas, they often do not stay, but only pass. Therefore, if the mobile terminal is in a high speed mobile state, small cell discovery should not be performed on it and switched to the small cell. That is to say, the small cell discovery process can be performed with the mobile terminal in a non-high speed moving state.
- the small cell discovery process can be performed in the case where the load condition of the small cell is good and the remaining resources are used for access by the mobile terminal.
- FIG. 4 is a diagram showing evaluation of a moving state of a mobile terminal according to an embodiment of the present invention.
- the mobile state evaluation unit 104 is further configured to The location information, the moving speed and the moving direction are used to calculate the dt time t stay required by the mobile terminal to pass through the small cell, and the calculated dwell time t stay is compared with a predetermined dwell time threshold to evaluate whether the mobile terminal is in a non-high speed Move status.
- the current position of the mobile terminal is A (x a , y a ), and the moving direction of the mobile terminal (ie, the angle between the arrow indicating the forward direction of the mobile terminal and the horizontal line in FIG. 4) is a, moving.
- the moving speed of the terminal at position A (x a , y a ) is v.
- the deployment location of the small cell ie, the deployment location of the access point of the small cell
- O the radius of the coverage of the small cell
- the calculated dwell time t stay may be compared to a predetermined dwell time threshold T stay to assess whether the mobile terminal is in a non-high speed moving state. For example, if t stay ⁇ T stay , the mobile terminal can be considered to be in a high-speed moving state, so Switching a mobile terminal to a small cell only degrades the experience of the user holding the mobile terminal. In addition, if t stay > T stay , the mobile terminal can be considered to be in a non-high speed mobile state, and thus the small cell discovery process of the mobile terminal can be triggered.
- FIG. 5 is a block diagram showing another configuration of an apparatus in a wireless communication system according to an embodiment of the present invention.
- the apparatus 500 in the wireless communication system includes a location information acquisition unit 502, a mobility state evaluation unit 504, an execution unit 506, and an inter-frequency neighbor cell measurement determination unit 508.
- the configurations of the location information acquiring unit 502, the mobile state evaluating unit 504, and the executing unit 506 are the same as the configurations of the location information acquiring unit 102, the mobile state evaluating unit 104, and the executing unit 106 in the device 100 shown in FIG. 1, respectively. Therefore, the specific details thereof will not be described herein.
- the inter-frequency neighbor cell measurement judging unit 508 in the device 500 will be described in detail.
- the inter-frequency neighbor cell measurement determining unit 508 can determine whether to trigger inter-frequency neighbor cell measurement of the mobile terminal.
- the mobile terminal satisfies the initial condition of small cell discovery, it indicates that the mobile terminal is close to the coverage of the small cell and will soon have the coverage of the small cell.
- the measurement of the signal quality of the neighboring cell by the mobile terminal is triggered at the appropriate time, and the measured signal quality of the neighboring cell is reported to the base station.
- the initial condition of the small cell discovery is one or more of the following: The mobile terminal is in a non-high speed mobile state, the load condition of the small cell is good and the remaining resources are used for access by the mobile terminal.
- the configuration of the cell measurement reference can be made to Section 10.1.3 in 3GPP TS 36.300 and Section 5.5.4 in 3GPP TS 36.331.
- the above measurement is not a big problem.
- inter-frequency that is, the case of inter-frequency measurement
- the above measurement is not suitable.
- the mobile terminal since the mobile terminal has only one signal, only one band of information can be received at the same time. Therefore, in order to achieve cell measurement between different frequencies, it is necessary to introduce the concept of "measurement gap".
- the measurement gap is defined as follows in 3GPP TS 36.311 section 8 ⁇ 2.1: Within the measurement gap, the mobile terminal will not transmit any data and will not tune the receiver of the mobile terminal to the frequency band of the E-UTRAN serving cell . In the uplink subframe immediately after the measurement gap, E-UTRAN Frequency Division Multiplexing (FDD) mobile terminals do not transmit any data, and if the subframe before the measurement gap is a downlink subframe, the E-UTRAN Time Division Multiplexing (TDD) mobile terminal does not transmit any data.
- FDD Frequency Division Multiplexing
- TDD Time Division Multiplexing
- the RRC_Connection_Reconfiguration message can be used to configure the MeasGapConfig IE, and the base station notifies the mobile terminal of the measurement gap, such as the starting point of the measurement gap, the length of the measurement gap, the number of measurement gaps, and the like.
- the base station notifies the mobile terminal of the measurement gap, such as the starting point of the measurement gap, the length of the measurement gap, the number of measurement gaps, and the like.
- two measurement gap modes that the mobile terminal can support are also provided in the 3GPP TS 36.133. For details, refer to 3GPP TS 36.133, and details are not described herein again. Therefore, the above question about how to trigger the measurement of the signal quality of the neighboring cell by the mobile terminal at an appropriate time is actually a question about when the measurement gap is configured.
- the mobile state evaluation unit 504 is further configured to calculate, according to the location information, the moving speed, and the moving direction of the mobile terminal, a response time of the mobile terminal to reach the coverage of the small cell, and the inter-frequency neighbor cell measurement and determination.
- the unit 508 is further configured to compare the calculated reaction time with a predetermined reaction time threshold to determine whether to trigger inter-frequency neighbor cell measurement of the mobile terminal.
- the reaction time t react ⁇ of the mobile terminal indicates the time when the mobile terminal reaches the coverage of the small cell from the current location according to the current motion state (for example, the current moving speed and the moving direction of the mobile terminal).
- the reaction time of how the mobile terminal reaches the coverage of the small cell has been described above in connection with FIG.
- the current position of the mobile terminal is A (x a , y a ), and the moving direction of the mobile terminal (ie, the angle between the arrow indicating the forward direction of the mobile terminal and the horizontal line in FIG. 4) is ⁇
- moving The moving speed of the terminal at position A ( x a , y a ) is v.
- the deployment location of the small cell ie, the deployment location of the access point of the small cell
- the radius of the coverage of the small cell is R b .
- the reaction time t reactl of the mobile terminal. n is equal to the time when the mobile terminal reaches the coverage of the small cell (ie, point B in FIG. 4) from the current position A (x a , y a ) according to the current moving speed V and the moving direction ⁇ .
- the reaction time may be calculated t reactl. n with a predetermined reaction time threshold T reactl . n compare to determine whether to trigger the inter-frequency neighbor cell measurement of the mobile terminal. For example, if t reactl n ⁇ T reactl . n , then the mobile terminal can be considered to be closer to the small cell, and the inter-frequency cell measurement of the mobile terminal should be triggered.
- the predetermined reaction time threshold T react can be determined based on the test.
- the coverage of the small cell is not circular. Therefore, after the measurement gap is configured, the following situations may occur: a) The small cell is discovered very quickly (for example, before the next positioning of the mobile terminal), and the small cell handover is successfully completed; b) soon found Small cell, no small cell handover; c) small cell discovery soon, but small cell handover failure occurs; d) small cell is discovered after a period of time (for example, after the next time the mobile terminal is located); or e) There was no small cell found for a long time.
- cell handover between different frequencies is often based on event triggering, such as A3 events.
- the entry condition of the A3 event is that the signal quality of the neighboring cell (e.g., based on the RSRP value or the RSRQ value) is higher than the offset with respect to the serving cell.
- the mobile terminal may be configured to periodically perform measurement caps. Therefore, if a measurement report of the mobile terminal with respect to the small cell is detected, it can be considered that the small cell has been found so far.
- the detection time t detect can be used to indicate the time from triggering the inter-frequency cell measurement to satisfying the A3 event trigger condition.
- the predetermined maximum detection time threshold can be determined based on the test. In addition, you can pass
- RRC Connectionion—Reconfiguration message to close the measurement gap.
- case c) this means that the inter-frequency inter-cell measurement is triggered later, resulting in insufficient response time and a handover failure.
- the present invention when determining whether to trigger inter-frequency neighbor cell measurement of the mobile terminal, receiving global navigation satellite system positioning information reported by the mobile terminal, and calculating according to the reported global navigation satellite system positioning information The moving speed and/or moving direction of the mobile terminal, and the like.
- the base station when the base station needs to obtain accurate positioning information, for example, when triggering the inter-frequency inter-cell measurement of the mobile terminal, the mobile terminal may be requested to report the global navigation satellite system positioning information to the base station. Based on the reported global navigation satellite system positioning information, the base station can calculate the moving speed and/or moving direction of the mobile terminal.
- the mobile state evaluation unit 504 is further configured to divide the boundary range into a plurality of sub-regions, each sub-region corresponding to a predetermined trigger probability, and further configured to determine, according to location information of the mobile terminal, where the mobile terminal is located The sub-area and its corresponding trigger probability; and the inter-frequency neighbor cell measurement determining unit 508 is further configured to trigger the inter-frequency inter-cell measurement of the mobile terminal according to the determined trigger probability corresponding to the sub-area in which the mobile terminal is located.
- the coverage of the small cell in the actual scenario is very irregular
- the angle of simplified modeling uses a circle to approximate the coverage of a small cell, thereby facilitating the evaluation of the mobile state.
- the coverage of the actual small cell needs to be considered.
- the boundary range may be divided into a plurality of sub-areas according to an angle and/or a distance with respect to the small cell, each sub-area corresponding to a predetermined trigger probability.
- the base station determines, according to the location information of the mobile terminal, the sub-area in which the mobile terminal is located and its corresponding trigger probability, and according to the determined sub-area to which the mobile terminal is located.
- the corresponding trigger probability triggers the inter-frequency neighbor cell measurement of the mobile terminal.
- the trigger probability can be related to factors such as whether the mobile terminal uses GNSS assistance and the success rate of previous small cell discovery.
- FIG. Fig. 6 is a block diagram showing another configuration of an apparatus in a wireless communication system according to an embodiment of the present invention.
- the apparatus 600 in the wireless communication system includes a location information acquisition unit 602, a mobility state evaluation unit 604, an execution unit 606, an inter-frequency neighbor cell measurement determination unit 608, and an inter-frequency neighbor cell access determination unit 610.
- the configurations of the location information obtaining unit 602, the mobile state evaluating unit 604, the executing unit 606, and the inter-frequency neighbor cell measurement determining unit 608 are respectively compared with the location information acquiring unit 502 in the apparatus 500 shown in FIG. 5, and the mobile state evaluation.
- the configuration of the unit 504, the executing unit 506, and the inter-frequency neighbor cell measurement determining unit 508 are the same, and thus detailed details thereof are not described herein again.
- the inter-frequency neighbor cell access judging unit 610 in the device 600 will be described in detail.
- the inter-frequency neighbor cell access judging unit 610 may, according to the inter-inter-frequency neighbor cell measurement of the mobile terminal, according to the measurement information of the mobile terminal and the location information of the mobile terminal, It is determined whether to trigger inter-frequency cell handover and/or carrier loading of the mobile terminal.
- the entry condition of the A3 event is that the signal quality of the neighboring cell (e.g., based on the RSRP value or the RSRQ value) is higher than the offset with respect to the serving cell.
- the mobile terminal may be configured to periodically perform measurement reporting. Therefore, in the case that the mobile terminal has triggered inter-frequency neighbor cell measurement, the base station may trigger the inter-frequency inter-cell handover of the mobile terminal or the mobile terminal according to the measurement information of the mobile terminal and the location information of the mobile terminal. Carrier loading process.
- FIG. 7 is a flow chart showing a method for use in a wireless communication system in accordance with an embodiment of the present invention. As shown in FIG. 7, the method begins in step 700. After step 700, the method proceeds to step 702.
- Step 702 is a location information acquisition step. At step 702, the location information of the mobile terminal is obtained. After step 702, the method proceeds to step 704.
- Step 704 is a mobile state evaluation step.
- the mobile terminal's mobile status is evaluated based on the location information of the mobile terminal at different times.
- step 704 the method proceeds to step 706.
- Step 706 is a step of performing. At step 706, a corresponding action related to the small cell discovery is performed based on the location information of the mobile terminal and the change in the mobile state.
- Fig. 7 The method shown in Fig. 7 is a method corresponding to the apparatus described in Fig. 1, and the specific details thereof will not be described again.
- FIG. Figure 8 is a diagram showing a method for use in a wireless communication system in accordance with another embodiment of the present invention.
- step 800 the method begins in step 800. After step 800, the method proceeds to step 802.
- Step 802 is a location information acquisition step. At step 802, location information of the mobile terminal is obtained.
- step 802 the method proceeds to step 804.
- Step 804 is a mobile state evaluation step.
- the mobile terminal's mobile status is evaluated based on the location information of the mobile terminal at different times.
- step 804 the method proceeds to step 806.
- Step 806 is a step of performing. At step 806, a corresponding action related to small cell discovery is performed based on the location information of the mobile terminal and the change in the mobile state.
- step 806 the method proceeds to step 808.
- Step 808 is a measurement and determination step of the inter-frequency inter-cell neighboring cell. At step 808, it may be determined whether the inter-frequency neighbor cell measurement of the mobile terminal is triggered.
- FIG. 8 is a method corresponding to the apparatus described in FIG. 5, and specific details thereof will not be described herein.
- a method for use in a wireless communication system according to another embodiment of the present invention will now be described with reference to FIG. 9 is a diagram showing a method for use in a wireless communication system in accordance with another embodiment of the present invention.
- step 900 the method begins in step 900. After step 900, the method proceeds to step 902.
- Step 902 is a location information acquisition step. At step 902, location information of the mobile terminal is obtained.
- step 902 the method proceeds to step 904.
- Step 904 is a mobile state evaluation step.
- the mobile terminal's mobile status is evaluated based on the location information of the mobile terminal at different times.
- step 904 the method proceeds to step 906.
- Step 906 is the step of performing. At step 906, a corresponding action related to the small cell discovery is performed based on the location information of the mobile terminal and the change in the mobile state.
- step 906 the method proceeds to step 908.
- Step 908 is a measurement step of the inter-inter-frequency neighbor cell measurement. In step 908, it may be determined whether the inter-frequency neighbor cell measurement of the mobile terminal is triggered if the mobile terminal satisfies the initial condition of the small cell discovery.
- step 908 the method proceeds to step 910.
- Step 910 is an inter-frequency neighbor cell access determination step.
- the inter-frequency inter-cell measurement of the mobile terminal may be determined according to the measurement information of the mobile terminal and the location information of the mobile terminal, whether to trigger the inter-frequency inter-cell handover of the mobile terminal. / or carry.
- Fig. 9 The method shown in Fig. 9 is a method corresponding to the apparatus described in Fig. 6, and the specific details thereof will not be described again.
- the mobile terminal initially appears in the outer area and moves to the small area at a low speed.
- the process of discovering a small cell according to the present embodiment will be described in detail below.
- the mobile terminal initially appears in the outer area and is connected to the base station.
- the base station is The mobile terminal configures a default acquisition period, and acquires location information of the mobile terminal according to a default acquisition period, thereby periodically updating the location information of the mobile terminal.
- the base station may calculate a moving speed of the mobile terminal according to the obtained two or more pieces of position information, and determine a boundary corresponding to the small cell according to the calculated moving speed. range.
- the coverage of the base station may be divided into an inner area, an intermediate area, and an outer area according to the boundary range and the coverage of the small cell.
- the acquisition period of the mobile terminal can be further updated according to the current moving speed of the mobile terminal. For example, the faster the mobile terminal moves, the shorter the acquisition cycle of the mobile terminal; the slower the mobile terminal moves, the longer the acquisition cycle of the mobile terminal.
- the initial default acquisition period is shorter.
- the boundary range of the cluster is no longer circular.
- the base station updates the location information of the mobile terminal with the acquisition period timing, and calculates the moving speed of the mobile terminal according to the location information of the mobile terminal until the mobile terminal leaves the coverage of the base station or enters another area. If the moving speed of the mobile terminal changes, the boundary range of the corresponding small cell also changes accordingly.
- the mobile terminal moves within the coverage of the base station. Once the base station finds that the mobile terminal is located within the boundary range corresponding to the small cell, it performs a corresponding decision process to determine whether the initial condition of the mobile terminal for the small cell is satisfied.
- the initial conditions are as follows. One or more of the items: The mobile terminal is in a non-high speed mobile state, the load condition of the small cell is good and there are remaining resources for access by the mobile terminal.
- the base station can shorten the acquisition period of the mobile terminal accordingly.
- the GNSS-assisted method can be utilized to improve the accuracy of measurement positioning of mobile terminals.
- the global navigation satellite system may be used. As the main positioning method.
- the base station acquires the location information of the mobile terminal in a corresponding acquisition period, and calculates the moving speed and the moving direction of the mobile terminal according to the measured multiple location information of the mobile terminal. Then, according to the above results, calculate the mobile terminal according to Reaction time of the previous moving speed and moving direction from the current position to the coverage of the small cell
- reaction if the calculated reaction time ⁇ reaction J, at a predetermined reaction time threshold ⁇ reaction ', triggers the inter-frequency inter-frequency neighbor discovery process of the mobile terminal with the trigger probability corresponding to the current location of the mobile terminal.
- the base station may trigger the inter-frequency inter-frequency cell handover and/or carrier loading process of the mobile terminal according to the measurement information of the mobile terminal and the location information of the mobile terminal. If the mobile terminal does not trigger the inter-frequency neighbor cell discovery process, the base station may continue to acquire the location information of the mobile terminal in the corresponding acquisition period, and calculate the mobile terminal's moving speed according to the measured multiple location information of the mobile terminal. Move direction, and calculate reaction time ⁇ reaction and calculate the calculated reaction time ⁇ reaction with the predetermined reaction time threshold T reactl . n for comparison.
- the mobile terminal completes inter-frequency cell handover and/or carrier loading, and the base station performs corresponding work, thereby implementing a location-based small cell discovery process.
- the second embodiment is basically the same as the first embodiment, and the main difference is that in the second embodiment, the moving speed of the mobile terminal is constantly changing.
- the differences between the second embodiment and the implementation of the first embodiment will be described in detail below.
- the base station calculates the moving speed of the mobile terminal based on the obtained plurality of location information of the mobile terminal, and updates the acquisition period of the mobile terminal according to the calculated moving speed.
- the base station may calculate an average value of the plurality of moving speeds of the mobile terminal in the past predetermined time period, and determine according to the calculated average value of the multiple moving speeds. Whether the initial condition discovered by the mobile terminal for the small cell is satisfied. If the initial condition of the mobile terminal for small cell discovery is not satisfied, the small cell discovery process is terminated until the initial condition for the small cell discovery by the mobile terminal is satisfied.
- the third embodiment is basically the same as the first embodiment, and the main difference is that:
- the location where the mobile terminal initially appears is within the boundary corresponding to the small cell.
- the differences between the third embodiment and the implementation of the first embodiment will be described in detail below.
- the boundary range corresponding to the small cell is set to a default value, which corresponds to a higher moving speed of the moving speed of the mobile terminal.
- the base station obtains the location information of the mobile terminal in a corresponding cycle, and calculates the moving speed and/or the moving direction of the mobile terminal based on the obtained plurality of location information of the mobile terminal.
- the base station finds that the mobile terminal leaves the boundary area corresponding to the small cell and enters the outer area, the base station accordingly performs low-accuracy positioning on the mobile terminal.
- the base station finds that the mobile terminal is close to the coverage of the small cell, the inter-frequency inter-cell measurement of the mobile terminal is triggered according to the method described above.
- FIG. Figure 10 is a block diagram showing the configuration of an apparatus in a wireless communication system according to an embodiment of the present invention.
- the apparatus 1000 in the wireless communication system may include an arrival angle measuring unit 1002, a round trip time measuring unit 1004, and a positioning unit 1006.
- the arrival angle measurement unit 1002 can measure the angle of arrival of the signal transmitted from the mobile terminal to the base station; the round trip time measurement unit 1004 can measure the round trip time required for the signal to travel back and forth between the mobile terminal and the base station; The unit 1006 can locate the mobile terminal according to the arrival angle and the round trip time, wherein the round trip time measuring unit 1004 measures the mobile terminal by using the timing advance of the mobile terminal to obtain the round trip. time.
- the apparatus may further include a receiving unit and a correcting unit, wherein the receiving unit may receive global navigation satellite system positioning information reported by the mobile terminal, and the correcting unit may be the global navigation satellite system
- the positioning information is a reference value to calculate an error correction factor, and the positioning is corrected using the error correction factor.
- FIG. 11 is a flow chart showing a method used in a wireless communication system according to an embodiment of the present invention.
- step 1100 the method begins in step 1100. After step 1100, the method proceeds to step 1102 or step 1104.
- Step 1102 is to achieve an angle measurement step.
- the measurement is sent from the mobile terminal The angle of arrival of the signal to the base station.
- Step 1104 is a round trip time measurement step.
- step 1104 measuring a round trip time required for the signal to reciprocate between the mobile terminal and the base station, wherein in the round trip time measuring step, using the timing advance of the mobile terminal The mobile terminal performs measurements to obtain the round trip time.
- step 1102 After step 1102 or step 1104, the method proceeds to step 1106.
- Step 1106 is a positioning step.
- the mobile terminal is located according to the angle of arrival and the round trip time.
- the method may further include a receiving step and a correcting step, wherein, in the receiving step, receiving global navigation satellite system positioning information reported by the mobile terminal; in the correcting step, The global navigation satellite system positioning information is a reference value to calculate an error correction factor, and the positioning is corrected using the error correction factor.
- Fig. 11 The method shown in Fig. 11 is a method corresponding to the apparatus described in Fig. 10, and specific details thereof will not be described again.
- embodiments of the present application also propose a program product that carries instructions executed by a machine, when the instructions are executed on the information processing device, the method.
- embodiments of the present application also provide a storage medium including machine readable program code, when the program code is executed on an information processing device, the program code causes the information processing device A method for use in a wireless communication system as in accordance with an embodiment of the present invention described above is performed.
- a storage medium for carrying a program product storing the above-described storage machine readable instruction code is also included in the disclosure of the present invention.
- the storage medium includes, but is not limited to, a floppy disk, an optical disk, a magneto-optical disk, a memory card, a memory, and the like.
- the apparatus and its components in the wireless communication system may be configured by means of software, firmware, hardware, or a combination thereof.
- the specific means or manner in which the configuration can be used is well known to those skilled in the art and will not be described herein.
- a program constituting the software is installed from a storage medium or a network to an information processing device (for example, the information processing device 1200 shown in FIG. 12) having a dedicated hardware structure, and the computer is installed in various kinds. When the program is executed, various functions and the like can be performed.
- FIG. 12 is a schematic block diagram showing an information processing apparatus that can be used as an implementation according to an embodiment of the present invention.
- a central processing unit (CPU) 1201 executes various processes in accordance with a program stored in a read only memory (ROM) 1202 or a program loaded from a storage portion 1208 to a random access memory (RAM) 1203.
- ROM read only memory
- RAM random access memory
- data required when the CPU 1201 executes various processes and the like is also stored as needed.
- the CPU 1201, the ROM 1202, and the RAM 1203 are connected to each other via a bus 1204.
- Input/output interface 1205 is also coupled to bus 1204.
- the following components are connected to the input/output interface 1205: an input portion 1206 (including a keyboard, a mouse, etc.), an output portion 1207 (including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.)
- the storage portion 1208 (including a hard disk or the like), the communication portion 1209 (including a network interface card such as a LAN card, a modem, etc.).
- the communication section 1209 performs communication processing via a network such as the Internet.
- the driver 1210 can also be connected to the input/output interface 1205 as needed.
- a removable medium 1211 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory or the like is mounted on the drive 1210 as needed, so that the computer program read therefrom is installed into the storage portion 1208 as needed.
- a program constituting the software is installed from a network such as the Internet or a storage medium such as the removable medium 1211.
- a storage medium is not limited to the removable medium 1211 shown in Fig. 12 in which a program is stored and distributed separately from the device to provide a program to the user.
- the detachable medium 1211 include a magnetic disk (including a floppy disk (registered trademark)), an optical disk (including a compact disk read only memory (CD-ROM), and a digital versatile disk (DVD)), and a magneto-optical disk (including a mini disk (MD) (registered trademark) )) and semiconductor memory.
- the storage medium may be a ROM 1202, a hard disk included in the storage portion 1208, or the like, in which programs are stored, and distributed to the user together with the device containing them.
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Abstract
Description
Claims
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ES13872980T ES2755090T3 (es) | 2013-01-25 | 2013-12-26 | Dispositivo y procedimiento en sistema de comunicación por radio |
BR112015017167-2A BR112015017167B1 (pt) | 2013-01-25 | 2013-12-26 | Dispositivo em um sistema de comunicação sem fio, método para uso em um sistema de comunicação sem fio, e, mídia de armazenamento em computador |
MX2015009103A MX351049B (es) | 2013-01-25 | 2013-12-26 | Dispositivo y método en sistema de comunicación por radio. |
EP13872980.1A EP2950582B1 (en) | 2013-01-25 | 2013-12-26 | Device and method in radio communication system |
JP2015554027A JP6332282B2 (ja) | 2013-01-25 | 2013-12-26 | 無線通信システムにおける装置及び方法 |
KR1020157021088A KR20150110568A (ko) | 2013-01-25 | 2013-12-26 | 무선 통신 시스템에서의 장치 및 방법 |
US14/760,648 US9913202B2 (en) | 2013-01-25 | 2013-12-26 | Device and method for proximity based small cell discovery |
CA2898544A CA2898544A1 (en) | 2013-01-25 | 2013-12-26 | Device and method in radio communication system |
RU2015135506A RU2653714C2 (ru) | 2013-01-25 | 2013-12-26 | Устройство и способ в системе беспроводной передачи данных |
AU2013375529A AU2013375529B2 (en) | 2013-01-25 | 2013-12-26 | Device and method in radio communication system |
ZA2015/06130A ZA201506130B (en) | 2013-01-25 | 2015-08-24 | Device and method in radio communication system |
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BR112015017167A2 (pt) | 2017-07-11 |
CN103974275A (zh) | 2014-08-06 |
JP2016504887A (ja) | 2016-02-12 |
US20150358890A1 (en) | 2015-12-10 |
JP6332282B2 (ja) | 2018-05-30 |
AU2013375529B2 (en) | 2017-04-20 |
ES2755090T3 (es) | 2020-04-21 |
KR20150110568A (ko) | 2015-10-02 |
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