WO2015016183A1 - 無線基地局装置、及び送信電力決定方法 - Google Patents
無線基地局装置、及び送信電力決定方法 Download PDFInfo
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- WO2015016183A1 WO2015016183A1 PCT/JP2014/069835 JP2014069835W WO2015016183A1 WO 2015016183 A1 WO2015016183 A1 WO 2015016183A1 JP 2014069835 W JP2014069835 W JP 2014069835W WO 2015016183 A1 WO2015016183 A1 WO 2015016183A1
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- base station
- transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
- H04W16/08—Load shedding arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
- H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
Definitions
- the present invention relates to a base station apparatus in a mobile communication system, and particularly relates to a technique for determining transmission power in a base station apparatus.
- a femto base station device may be installed in a macro cell in order to improve wireless quality in a small area such as in a home or to distribute traffic of the macro cell.
- Some femto base station devices have a wireless plug-and-play (wireless PnP) function that monitors the surrounding radio wave environment and automatically sets wireless-related parameters in order to realize a simple installation method. Some are equipped.
- wireless PnP wireless plug-and-play
- the femto base station device With this wireless PnP function, for example, just by turning on the femto base station device, the femto base station device automatically sets and adjusts various wireless-related parameters depending on the installation status, etc. Since it is unnecessary to set various parameters based on the radio wave measurement and the radio wave measurement result, the operation can be started more easily.
- the wireless PnP function described above it is determined whether any of the surrounding macro base station apparatuses has transmitted, detects an identification parameter, and performs a setting that is different from that of the surrounding macro base station apparatuses. There is a function of measuring the radio wave intensity (interference) from the base station apparatus and setting the transmission power of the femto base station apparatus from the amount of interference.
- the transmission band that can be used in LTE wireless communication is wider than the transmission band that is used in 3G wireless communication.
- the bandwidth of the transmission band may be different for each cell in LTE. That is, for the femto base station apparatus compatible with LTE, there may be a case where there are one or a plurality of neighboring cells operated in a transmission band having a narrower bandwidth than its own transmission band.
- the amount of interference from neighboring cells differs for each part of the transmission band of the femto base station apparatus.
- the femto base station It is difficult to obtain an appropriate transmission power for moving a mobile terminal in a cell of the apparatus.
- the present invention has been made in view of the above points, and in a radio base station apparatus, even when there is a neighboring cell operated in a transmission band having a narrower bandwidth than its own transmission band, transmission power is appropriately set.
- the purpose is to provide a technology that makes it possible to make decisions.
- a radio base station apparatus having a function of determining transmission power, A neighboring cell detector that detects neighboring cells that interfere with target cells that can be formed by the radio base station device; For each neighboring cell detected by the neighboring cell detector, a received power measuring unit that measures received power from the neighboring cell; For each band part that overlaps the transmission band of the radio base station device among the transmission bands of the neighboring cells, the sum of the received power of the neighboring cells having the transmission band including the band part is calculated, and the sum of the received powers
- a radio base station apparatus comprising: a transmission power determining unit that determines an interference amount in the target cell based on the interference cell and determines transmission power using the interference amount.
- the transmission power determination unit for example, considers the maximum value of the sums of reception power calculated for each band portion as the interference amount in the target cell, and determines the transmission power using the interference amount.
- FIG. 4 is a flowchart illustrating an example of a procedure related to transmission power setting of the small base station device 100. It is a figure which shows the example of the measurement point in the detection of a surrounding cell. It is a figure which shows the other example of the surrounding cell electromagnetic wave environment in a basic example. It is a functional block diagram of the small base station apparatus 100 in the modification 1.
- FIG. 4 is a flowchart illustrating an example of a procedure related to transmission power setting of the small base station device 100. It is a figure which shows the example of the measurement point in the detection of a surrounding cell. It is a figure which shows the other example of the surrounding cell electromagnetic wave environment in a basic example. It is a functional block diagram of the small base station apparatus 100 in the modification 1.
- FIG. It is a function block diagram of the small base station apparatus 100 in 2nd Embodiment. It is a figure which shows the example of the other cell transition parameter calculated and alert
- the communication method is not limited to this.
- the femto base station apparatus provided with a wireless PnP function is assumed as the small base station apparatus 100 described in the following embodiment, the small base station apparatus 100 is limited to such a femto base station apparatus. Do not mean.
- the small base station apparatus 100 is an example of the radio base station apparatus according to the present invention, but the application destination of the transmission power determination technique in the radio base station apparatus according to the present invention is not limited to the small base station apparatus.
- the present invention can be applied to other types of base station apparatuses (macro base stations and the like).
- a macro cell is taken as an example of a neighboring cell, but the neighboring cell may be a cell by another small base station device.
- FIG. 1 shows an overall configuration example of a mobile communication system according to the present embodiment.
- a small base station apparatus 100 according to the present embodiment is installed in an environment where macro base station apparatuses 1, 2, and 3 exist in the vicinity.
- cells formed by the macro base station apparatuses 1, 2, and 3 are indicated by dotted lines, and cells formed by the small base station apparatus 100 of the present embodiment (hereinafter referred to as “target cell”). Is indicated by a solid line.
- the macro base station apparatus 1 forms a neighboring cell # 1
- the macro base station apparatus 2 forms a neighboring cell # 2
- the macro base station apparatus 3 Peripheral cell # 3 is formed.
- the small base station apparatus 100 is connected to the core network of the mobile communication network by a communication line (for example, a broadband line). Furthermore, the small base station apparatus 100 can acquire information such as the number of terminal connections from other base station apparatuses via a core network or by direct communication between base stations (for example, communication using an X2 interface). And
- the macro base station apparatus 1 corresponds to LTE
- the macro base station apparatus 2 corresponds to LTE
- the macro base station apparatus 3 corresponds to 3G.
- the small base station apparatus 100 supports both 3G and LTE, in the embodiment of the present invention, it is not essential to support both 3G and LTE, and it is an apparatus that supports only LTE. Also good.
- the embodiment of the present invention mainly relates to transmission power setting on the LTE side in the small radio base station 100.
- the transmission power setting on the 3G side can be performed with existing technology. However, for example, when it is assumed that there is a peripheral base station operated with a system bandwidth narrower than the system bandwidth (5 MHz) of 3G, the technique of the present invention is also used for transmission power setting on the 3G side. Can be done.
- the transmission frequency bandwidth used in the 3G base station apparatus (hereinafter, the transmission frequency bandwidth is described as “bandwidth”. This may be described as “system bandwidth”) is used in LTE. Narrower than bandwidth.
- the macro base station apparatus 1 uses LTE 10 MHz
- the macro base station apparatus 2 uses LTE 15 MHz
- the macro base station apparatus 3 uses 3 G 5 MHz.
- the LTE bandwidth of the small base station apparatus 100 is 15 MHz.
- the radio wave band (transmission band) of the peripheral cells with respect to the small base station apparatus 100 is as shown in FIG. FIG. 2 also shows the bandwidth of the small base station device 100.
- the small base station apparatus 100 first detects the communication method and band for each neighboring cell shown in FIG. 2 by performing a cell search.
- the small base station apparatus 100 divides its own band every 5 MHz (step 1) and calculates interference power (interference amount) for each divided band (step 2). . Specifically, the received power is measured for each neighboring cell, the received power is added for each overlapping band portion, and the result is used as the interference power for each band.
- the transmission power of the base station is constant over the entire transmission band.
- the received power from the neighboring cell # 1 (macro base station apparatus 1) is ⁇
- the received power from the neighboring cell # 2 (macro base station apparatus 2) is ⁇
- the neighboring cell # The received power from 3 (macro base station apparatus 3) is ⁇ .
- the bands of neighboring cells # 1 to # 3 overlap with the bands of small base station apparatus 100
- the bands of neighboring cells # 1 and # 2 are the bands of small base station apparatus 100.
- the interference power in subband 1 (the total received power from neighboring cells) is ⁇ + ⁇ + ⁇
- the interference power in subband 2 is ⁇ + ⁇
- the interference power in subband 3 is ⁇ .
- the small base station device 100 After obtaining the interference power for each divided band in this way, the small base station device 100 sets the maximum value among the interference powers of the plurality of divided bands to the interference power (interference amount) in the target cell of the small base station device 100. ) And determines its own transmission power based on the interference power (step 3). It is an existing technology to determine the transmission power of a base station in order to obtain a desired reception quality in a state where a mobile terminal receives interference of a certain amount of interference power.
- the transmission power is calculated as ⁇ + ⁇ + ⁇ + offset value.
- the offset value is a value determined by, for example, the size of a cell to be formed, desired reception quality, and the like.
- the mobile terminal basically performs the operation of determining the cell in the area based on the magnitude of the received power of the radio wave from the base station, as described above, the maximum value of the interference power of the plurality of divided bands is set for the target cell.
- the mobile terminal with the largest amount of interference from neighboring cells can be located in the target cell and form the target cell appropriately. can do.
- FIG. 4 shows a functional configuration diagram of small base station apparatus 100 in the present embodiment.
- the small base station apparatus 100 includes a radio reception unit 101, a neighboring cell detection unit 102, a reception power measurement unit 103, a transmission power determination unit 104, a transmission power setting unit 105, and a radio transmission unit 106.
- the configuration shown in FIG. 4 is a configuration related to automatic transmission power setting using the technique according to the present invention in the small base station device 100. Includes an existing function (not shown) in order to function as a base station apparatus.
- the wireless reception unit 101 is a functional unit that receives wireless signals (radio waves).
- the wireless transmission unit 106 is a functional unit that transmits a wireless signal.
- the small base station apparatus 100 according to the present embodiment is compatible with a plurality of communication schemes (3G and LTE, etc.), and the wireless reception unit 101 has a reception function for each communication scheme, and cell detection and reception described later. Power measurement can also be performed for each communication method.
- the wireless transmission unit 106 has a transmission function for each communication method. In the present embodiment, 3G and LTE are assumed as a plurality of wireless communication schemes, but the communication schemes are not limited to these.
- the neighboring cell detection unit 102 is a functional unit that performs cell search for each communication method, detects neighboring cells, and detects bands (center frequency, bandwidth, and the like) used for downlink communication in the neighboring cells.
- Received power measuring section 103 measures received power for each neighboring cell detected by neighboring cell detecting section 102 based on a reference signal (Reference Signal) from a neighboring cell received by wireless receiving section 101, a pilot signal, or the like. (calculate. Examples of the received power measured by the received power measuring unit 103 include RSRP and CPICH RSCP.
- the transmission power determination unit 104 is a functional unit that determines transmission power based on reception power (interference power) for each neighboring cell obtained by the reception power measurement unit 103.
- the transmission power determination unit 104 also has a function of performing control for causing the neighboring cell detection unit 102, the reception power measurement unit 103, and the like to perform operations.
- the transmission power setting unit 105 is a functional unit that sets the transmission power determined by the transmission power determination unit 104 in the wireless transmission unit 106.
- the wireless transmission unit 106 transmits a wireless signal with the set transmission power.
- the transmission power determination unit 104 determines and sets transmission power for LTE.
- transmission power is determined and set by existing technology.
- the transmission power setting technique described in the present embodiment can also be used for 3G, for example, when there is a peripheral cell that uses a bandwidth narrower than the bandwidth used for 3G.
- Step 101 Neighboring cell detection
- the neighboring cell detection unit 102 performs cell search (cell detection).
- the cell search is performed for each communication method.
- the cell search is performed after the synchronization signal is received and the frame synchronization is performed.
- a process of receiving necessary information (such as bandwidth in LTE) is performed.
- the search synchronization signal of the synchronization signal is measured by measuring a band that may correspond to the band of the central part. Detection).
- a search is performed in the same manner as in LTE in that a band (frequency) in which a synchronization signal may be transmitted is measured.
- the small base station device 100 has a bandwidth of 15 MHz, and the minimum bandwidth of the peripheral cells is 5 MHz. Then, frequency points (referred to as measurement points) at which the center of the band of the peripheral cell that overlaps at least partly with the transmission band of the small base station apparatus 100 itself are arranged at 2.5 MHz intervals as shown in FIG. It is assumed that it is 5 points in advance. That is, the information on the point is stored in advance in the storage unit of the peripheral cell detection unit 102. In addition, it is good also as acquiring the information of the said point from the outside (for example: core network) and using the acquired information.
- the outside for example: core network
- the neighboring cells are detected by detecting the synchronization signal in a predetermined band centered on the frequency of each point.
- This detection processing is performed for each communication method. For example, if there is a peripheral cell of a certain communication method (for example, 3G), if it is known that a synchronization signal is detected only in a specific point band, As for the communication method, it is only necessary to detect the point.
- the peripheral cell detection is basically performed for a plurality of points for each communication method, in order to make the explanation easy to understand, in this embodiment, the measurement point is fixed for 3G and the search for a plurality of points is performed for LTE. I will do it.
- peripheral cell As a peripheral cell, as shown in FIG. 2, not only a peripheral cell having a bandwidth that is a natural number multiple of 5 MHz but also a peripheral cell having an LTE 1.4 MHz bandwidth may exist, The number of points at which the centers of overlapping neighboring cell bands may exist is very large.
- the number of measurement points can be limited as shown in the following examples (1) to (5), for example. That is, the search can be performed with a smaller number of measurement points than the number of measurement points assumed. In addition, you may perform the restriction
- a threshold value for the number of measurement points is provided, and the threshold value is stored in the storage means of the neighboring cell detection unit 102.
- the neighboring cell detection unit 102 first detects the synchronization signal of the measurement point at a wide interval, Detection is performed by gradually narrowing the interval. In addition, it is good also as acquiring the threshold value of the number of measurement points from the outside (example: core network), and utilizing the acquired threshold value.
- the neighboring cell detection unit 102 counts the number of points that have been measured, and ends the measurement when the number of points reaches a threshold value.
- the threshold value is larger than 5, in the example shown in FIG. 6, first, measurement of 5 points shown in FIG. 6 is performed. Next, for example, with respect to measurement points assuming the presence of a peripheral cell having an LTE 1.4 MHz bandwidth, measurement is performed over the entire 15 MHz at an interval B larger than 0.7 MHz (so that the number of points does not increase). Subsequently, measurement is performed at intervals smaller than B. Such processing is performed in a range where the number of measurement points does not exceed the threshold value.
- a threshold may be provided by the number of detected neighboring cells.
- the number of neighboring cells that actually interfere with the cells formed by the small base station apparatus 100 is not large. Therefore, in this example, a threshold value for the number of detections of neighboring cells is determined in advance and set in the storage unit of the neighboring cell detection unit 102, and when the neighboring cell detection unit 102 detects neighboring cells for the number of the threshold values. Then, the neighboring cell detection process is terminated.
- a threshold may be provided based on the interference amount of neighboring cells. If small base station apparatus 100 is a femto base station apparatus assumed in the present embodiment, it is generally installed in a macro cell. Then, the interference from the macro cell becomes a dominant interference amount with respect to the small base station apparatus 100, and it is considered that the influence as interference of other neighboring cells is small. Therefore, in this example, when a neighboring cell in which received power equal to or greater than a predetermined value determined as being equivalent to the amount of interference from the macro cell is detected, neighboring cell detection is terminated. In this example, every time the neighboring cell detection unit 102 detects a neighboring cell, the received power measuring unit 103 measures the received power for the neighboring cell.
- the number of measurement points may be changed according to the timing for setting the transmission power. For example, when the small base station apparatus 100 is started up (when the power is turned on), the number of measurement points is reduced, and after the start-up (during operation), all the assumed measurement points are measured. During operation, for example, transmission power is set at predetermined time intervals. The reason why such a process is performed is that it is desired to make the operation state as quickly as possible at the time of startup.
- a threshold value (eg, 100 seconds) for searching for neighboring cells is determined, the search is terminated when the threshold time has elapsed from the start of the search, and the neighboring cells detected when the search is finished
- the transmission power may be set based on the above.
- the neighboring cell detection unit 102 includes a timer that sets the threshold time, starts the timer when the search starts, and ends the search when the timer expires.
- the threshold time may be stored in advance in the storage unit of the small base station device 100, or may be acquired from the outside (eg, core network).
- the neighboring cell detecting unit 102 grasps the bandwidth used in the neighboring cell based on broadcast information (such as MIB) received from the neighboring cell.
- broadcast information such as MIB
- 3G may have a fixed bandwidth (5 MHz).
- the received power measurement unit 103 measures the received power for each neighboring cell detected in step 101.
- the reception power measurement method is not particularly limited.
- the reception power can be obtained by taking the average value of the reception power of reference signals (reference signals and pilot signals) transmitted from neighboring cells over the entire system band over the entire band. Can be calculated.
- Step 103 Determine and set transmission power
- the transmission power determination unit 104 determines its own (small base station apparatus 100) transmission power based on the reception power for each neighboring cell calculated in step 102.
- the transmission power determining unit 104 obtains the sum of the received power for each band portion where the band overlaps the band of the target cell for the received power of each neighboring cell, and the maximum value of the sum is used as the interference power (interference amount) of the target cell.
- the “band part” is divided band 1, divided band 2, and divided band 3. That is, the transmission power determination unit 104 performs, for each band part (divided band 1, divided band 2, divided band 3) overlapping with the transmission band of the small base station device 100, in the transmission band of each neighboring cell.
- the sum of received power of neighboring cells having a transmission band including, calculates the amount of interference in the target cell based on the sum of the received power, and determines the transmission power based on the amount of interference.
- the above “reception power of a peripheral cell having a transmission band including a band part” is ⁇ and ⁇ when the band part is the divided band 2, for example.
- the width of the “band part”, that is, the unit of band division, is preferably equal to or smaller than the minimum bandwidth of the neighboring cell bandwidths.
- the band of the peripheral cell is detected as shown in FIG. 7 and the received powers are P1, P2, and P3 as shown in the figure.
- the left end of the band of the target cell is set to 0, and the frequency position of the end of the band of each neighboring cell is shown.
- the band portion indicated by A is P1 + P2 + P3 at the maximum, and this value is regarded as interference power.
- the transmission power determination unit 104 determines the transmission power by adding an offset value to the interference power obtained as described above, for example. Then, the transmission power setting unit 105 sets the transmission power determined by the transmission power determination unit 104 in the wireless transmission unit 106.
- the width of the “band part” is equal to the bandwidth of the neighboring cell.
- the bandwidth is preferably smaller than the minimum bandwidth.
- the width of the “band part” is preferably half (2.5 MHz) of the minimum bandwidth (5 MHz) of the bandwidths of the peripheral cells.
- the maximum sum of the overlapping portions of bands for example, ⁇ + ⁇ + ⁇ in FIG. 3 is regarded as interference power.
- boosting corresponding to the interference is performed for each band, and its own transmission power is set.
- transmission power suitable for interference may be set for each band.
- ⁇ Modification 1> the maximum value of the sum of the overlapping portions of the bands is regarded as interference power. Thereby, even the mobile terminal that receives the largest interference can be accommodated in the target cell of the small base station apparatus 100.
- the transmission power becomes excessive.
- the transmission power is calculated by regarding the maximum sum as interference power, it is excessive for the mobile terminal of the neighboring cell using the divided band 1 + 2 to make a transition to the target cell.
- the target cell becomes too wide (gives interference) to neighboring cells using the divided band 1 + 2 due to transmission power. In that case, for example, many mobile terminals may move from the neighboring cell using the divided band 1 + 2 to the target cell, and the number of terminals accommodated in the target cell may be too large, which may exceed the processing capability.
- the transmission power determination unit 104 determines a value that is regarded as interference power based on the number of mobile terminals (for example, UEs in an RRC connection state) connected to the target cell. Is going to be determined.
- FIG. 8 is a functional configuration diagram of the small base station apparatus 100 in the first modification. As shown in FIG. 8, the configuration having the terminal state management unit 107 is different from the configuration shown in FIG.
- the terminal state management unit 107 has a storage unit that stores information indicating whether or not the mobile terminal is RRC-connected for each mobile terminal, and the transmission power determination unit 104 refers to the storage unit. The number of mobile terminals connected to the target cell can be calculated.
- the transmission power determination unit 104 holds threshold 1 and threshold 2 for the connected terminal (threshold 1> threshold 2).
- the small base station apparatus 100 uses the maximum value ( ⁇ + ⁇ + ⁇ ) as interference power for determining transmission power when starting up. During operation, the value regarded as interference power is adjusted according to the number of connected terminals. In this example as well, neighboring cell detection and reception power measurement for each neighboring cell are performed during operation. For the sake of easy understanding, the received power from neighboring cells that causes interference for each measurement is shown in FIG. It shall be as follows.
- the transmission power determination unit 104 refers to the terminal state management unit 107 to determine the number of connected terminals at predetermined time intervals (may be the same as or different from neighboring cell detection and measurement operations). The number of connected terminals is compared with the threshold value. If the number of connected terminals ⁇ threshold value 2 as a result of comparison, the number of connected terminals is sufficiently small, and transmission power is determined using the maximum value ( ⁇ + ⁇ + ⁇ ). As a result of comparison, when threshold 1> number of connected terminals ⁇ threshold 2, the number of connected terminals is slightly large. Therefore, in order to weaken the transmission power slightly, ⁇ + ⁇ is used as reception power for determining transmission power, and transmission power is based on this. To decide. As a result, the mobile terminal at the cell edge that actually receives ⁇ + ⁇ + ⁇ interference may be out of the target cell.
- the number of connected terminals ⁇ threshold value 1 when the number of connected terminals ⁇ threshold value 1, ⁇ is used as reception power for determining transmission power in order to further weaken transmission power.
- the mobile terminal at the cell edge that actually receives the interference of ⁇ + ⁇ + ⁇ and the mobile terminal at the cell edge that actually receives the interference of ⁇ + ⁇ may be out of the target cell.
- the number of connected terminals ⁇ threshold value 1 when there are very many mobile terminals located in the neighboring cell # 2 in the band corresponding to ⁇ , the number of connected terminals ⁇ threshold value 1 even when ⁇ is used as the reception power for determining the transmission power. Although it is conceivable that the state continues, in such a case, the transmission power may be further reduced.
- the transmission power determination unit 104 acquires the number of connected terminals, and based on the number of connected terminals, the target cell is selected from the sum of received power calculated for each band portion. A value to be used as the amount of interference is selected, and the transmission power is determined using the value. Thereby, it is possible to set appropriate transmission power according to the number of connected terminals.
- the interference power is regarded as the sum of the received powers of the detected neighboring cell bands.
- the received power may be weighted and added. For example, when it is known that the number of connected terminals or traffic is constantly high in the LTE station among the neighboring macro base station apparatuses, weighting is performed so that the received power in the LTE band is increased (addition) ( Weighting by communication method).
- the transmission power determination unit 104 sets the LTE weighting coefficient to A (1 / A), A 3G weighting coefficient is set to B (1 / B), and weighting is performed for each communication method.
- the weighting coefficient may be set in advance in the transmission power determination unit 104, or may be acquired from the outside (eg, core network) and the acquired weighting coefficient may be used.
- A is reduced and the LTE interference is increased.
- B is 1 and A is a number smaller than 1.
- the transmission power of the small base station device 100 can be increased, and the number of mobile terminals located in the target cell of the small base station device 100 can be increased.
- “( ⁇ + ⁇ ) / A + ⁇ / B” having the maximum sum is adopted as the interference power. If no weight is added, ⁇ + ⁇ + ⁇ is interference power. However, as a result of weighting the LTE band, a value larger than ⁇ + ⁇ + ⁇ becomes interference power, resulting in an increase in transmission power.
- the weighting coefficient is set in advance, but the small base station device 100 is connected to the peripheral base station from the peripheral base station through communication with the peripheral base station via the core network or communication between base stations.
- Information on the number of terminals (or traffic) being received may be received, and the transmission power determination unit 104 may determine a weighting coefficient based on the information on the number of terminals.
- the weighting coefficient is determined so that, for example, the value of received power corresponding to a neighboring base station with a large number of terminals (traffic) is increased.
- FIG. 9A when information of the same number of terminals is received from a plurality of LTE stations and information of a smaller number of terminals is received from 3G stations, the above example Similarly, for example, B is 1 and A is a number smaller than 1.
- weighting according to the frequency is possible.
- the mobile terminal located in LTE 15 MHz is changed to the target cell of the small base station apparatus 100 as much as possible.
- the weighting is reduced so that interference is increased when there is a surrounding 15 MHz base station.
- Z is reduced.
- Z is a number less than 1 and X and Y are numbers greater than 1 so that ⁇ / Z is maximized.
- the transmission power determination unit 104 weights the reception power for each communication method of the neighboring cells detected by the neighboring cell detection unit 102, and sets the weighted reception power for each band portion. The sum is calculated, the maximum value of the weighted received power is regarded as the amount of interference in the target cell, and the transmission power is determined using the amount of interference. Further, the transmission power determination unit 104 weights the sum of received power for each band portion, regards the maximum sum of the weighted received power as the amount of interference in the target cell, and uses the amount of interference to transmit power. May be determined. These may be combined.
- the small base station apparatus 100 sets the parameter for the other cell transition which a mobile terminal uses to the value according to surrounding interference power, and notifies (notifies
- FIG. 10 shows a functional configuration of the small base station apparatus 100 according to the present embodiment. As shown in FIG. 10, the configuration of small base station apparatus 100 according to the present embodiment is obtained by adding other cell transition parameter determination section 108 to the configuration shown in FIG.
- the other cell transition parameter determination unit 108 determines the interference power determined by the transmission power determination unit 104 ( ⁇ + ⁇ + ⁇ in the example of FIG. 3) by the processing described in the first embodiment (including the modification).
- the other cell transition parameter is determined by adding a predetermined offset value or the like.
- the determined parameter is reported to the mobile terminal by the wireless transmission unit 106 as broadcast information (SIB or the like), for example.
- SIB broadcast information
- FIG. 1 An example of parameters determined by the other cell transition parameter determination unit 108 is shown in FIG. The contents are as follows. These are merely examples. These parameters are those of LTE, but similarly for 3G, other cell transition parameters can be calculated from the interference power.
- Sintra threshold value for starting a cell search at the same frequency as the serving cell when the received power (reception level) of the serving cell is smaller than this value.
- Snonintra a threshold value for starting a cell search of a frequency different from that of the serving cell when the received power of the serving cell is smaller than this value.
- Thresh, serving, low Threshold values for starting a cell search for a cell having a lower priority than the serving cell when the received power of the serving cell is smaller than this value.
- Threshold value for starting 3G cell search when location priority is LTE> 3G The other cell transition parameter determination unit 108 determines Sintra by adding the offset value to the interference level calculated by the transmission power determination unit 104, subtracts the conversion offset value from the determined Sintra, determines Snonintra, and further converts Threserving, low is determined by subtracting the offset value.
- the offset value and the conversion offset value are parameters that are determined in advance and set (stored) in the other cell transition parameter determination unit 108. Further, these parameters may be acquired from the outside (eg, core network), and the acquired parameters may be used.
- a parameter used for the mobile terminal to perform another cell transition is determined, and the parameter is transmitted to the mobile terminal.
- Another cell transition parameter determination and transmission means is provided.
- the transmission power is determined based on the interference power from the neighboring cells, but when determining the transmission power, the transmission power is determined in consideration of the path loss in the mobile terminal. Also good. For example, when the path loss reported from the mobile terminal is large, the transmission power of the small base station device 100 is increased to improve the reception quality in the mobile terminal located.
- FIG. 12 shows a functional configuration diagram of the small base station apparatus 100 according to the present embodiment. As shown in FIG. 12, the point provided with path loss acquisition section 109 and registered user information acquisition section 110 is different from small base station apparatus 100 shown in FIG.
- Radio receiving section 101 receives a report signal including a downlink path loss measured by a mobile terminal connected to small base station apparatus 100, and path loss acquisition section 109 receives path loss and mobile terminal identification information from the report signal. Is transmitted to the transmission power determination unit 104.
- a registered user information database 200 (storage unit) that stores identification information of mobile terminals that are subject to path loss consideration, and the registered user information acquisition unit 110 transmits the registered user information database 200 via the network.
- the identification information of the mobile terminal to be considered for path loss is acquired from the transmission power determination unit 104 and passed to the transmission power determination unit 104.
- the registered user information database 200 may be provided as a device in the core network of the mobile communication network, for example, or the registered user information database 200 may be provided in the small base station device 100.
- the identification information of the mobile terminal to be considered for path loss is registered in the registered user information database 200 in advance.
- the mobile terminal that is subject to path loss consideration is, for example, a mobile terminal that can be used in a home where the small base station device 100 is installed (for example, one household).
- the transmission power determination unit 104 determines the transmission power based on the interference power as described above, and then, based on the information acquired by the registered user information acquisition unit 110, the path loss acquisition unit. Among the path loss acquired in step 109, the path loss for the mobile terminal that is subject to path loss consideration is grasped. Then, the determined transmission power is adjusted based on the maximum (worst) path loss among the path losses for the mobile terminal to be considered for path loss. For example, when the maximum path loss is larger than a predetermined threshold, the transmission power is adjusted to increase as the path loss increases. Further, when the maximum path loss is smaller than a predetermined threshold, adjustment may be made to reduce the determined transmission power.
- the present embodiment includes the path loss acquisition unit 109 that acquires the path loss in the downlink direction from the mobile terminal connected to the small base station apparatus 100, and the transmission power determination unit 104 is acquired by the path loss acquisition unit 109.
- the transmission power is adjusted based on the path loss for the mobile terminal registered in advance among the path loss that has been performed.
- the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
- the small base station apparatus 100 has been described using a functional block diagram, but each of such apparatuses may be realized by hardware, software, or a combination thereof.
- Software that operates in accordance with the present invention that is, software executed by a processor included in the small base station apparatus 100 is random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, register, hard disk ( (HDD), a removable disk, a CD-ROM, a database, a server, or any other suitable storage medium.
- RAM random access memory
- ROM read only memory
- EPROM EPROM
- EEPROM electrically erasable programmable read-only memory
- register hard disk
- HDD hard disk
- removable disk a CD-ROM
- database a database
- server or any other suitable storage medium.
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Abstract
Description
前記無線基地局装置が形成できる対象セルに対して干渉となる周辺セルを検出する周辺セル検出部と、
前記周辺セル検出部により検出された周辺セル毎に、当該周辺セルからの受信電力を測定する受信電力測定部と、
各周辺セルの送信帯域のうち、前記無線基地局装置の送信帯域と重複する帯域部分毎に、当該帯域部分を含む送信帯域を有する周辺セルの受信電力の和を算出し、当該受信電力の和に基づいて前記対象セルにおける干渉量を決定し、当該干渉量を用いて送信電力を決定する送信電力決定部とを備えたことを特徴とする無線基地局装置が提供される。
<システム全体構成例>
図1に、本実施の形態に係る移動通信システムの全体構成例を示す。図1に示すように、本移動通信システムでは、本実施の形態に係る小型基地局装置100が、周辺にマクロ基地局装置1、2、3が存在する環境の中に設置される。図1に示す例では、マクロ基地局装置1、2、3により形成されるセルを点線で示し、本実施の形態の小型基地局装置100により形成されるセル(以下、これを"対象セル"と呼ぶ)を実線で示している。図1に示すように、小型基地局装置100に対して、マクロ基地局装置1は周辺セル#1を形成し、マクロ基地局装置2は周辺セル#2を形成し、マクロ基地局装置3は周辺セル#3を形成する。
上記のような前提における本実施の形態に係る小型基地局装置100の送信電力設定の動作概要を、図2、図3を参照して説明する。この動作は、例えば、小型基地局装置100の電源が入れられた後や、運用中に定期的に自動的に実行されるものである。
図4に、本実施の形態における小型基地局装置100の機能構成図を示す。図4に示すように、小型基地局装置100は、無線受信部101、周辺セル検出部102、受信電力測定部103、送信電力決定部104、送信電力設定部105、及び無線送信部106を備える。なお、図4に示す構成(他の図の構成も同様)は、小型基地局装置100において本発明に係る技術を用いた自動送信電力設定に関わる構成を示すものであり、小型基地局装置100は、基地局装置として機能するために図示しない既存の機能も含むものである。
図5のフローチャートの手順に沿って、基本例を説明する。
小型基地局装置100が所定の通信回線(例:ブロードバンド回線)に接続され、電源がONされた後、周辺セル検出部102は、セルサーチ(セルの検出)を行う。セルサーチは、通信方式毎に行うが、本実施の形態で想定する通信方式(3G,LTE)ではともに、同期信号を受信し、フレーム同期等をとった後に、当該セルで通信を行うために必要な情報(LTEでは帯域幅等)を受信するという処理を行う。特に、LTEでは、同期信号は、システム帯域幅の中心部分の帯域(周波数)で送信されるため、当該中心部分の帯域に該当する可能性のある帯域を測定することにより、サーチ(同期信号の検出)を行う。3Gでも、同期信号が送信される可能性のある帯域(周波数)を測定するという点で、LTEと同様にサーチを行う。
次に、受信電力測定部103が、ステップ101で検出した周辺セル毎に、受信電力を測定する。受信電力の測定手法に特に限定はないが、例えば、システム帯域全体にわたって周辺セルから送信される参照信号(基準信号、パイロット信号)の受信電力の全帯域に渡る平均値をとることで、受信電力を算出することができる。
次に、送信電力決定部104が、ステップ102で算出した周辺セル毎の受信電力に基づいて自分(小型基地局装置100)の送信電力を決定する。
基本例では、帯域の重なる部分の和の最大値を干渉電力と見なしている。これにより、最も大きな干渉を受ける移動端末でも、小型基地局装置100の対象セルに収容させることができるようになる。
これまでに説明した例では、検出された周辺セルの帯域の受信電力の和を求めることで干渉電力と見なしていたが、受信電力に重み付けをして加算することとしてもよい。例えば、周辺マクロ基地局装置のうちLTE局にて接続端末数もしくはトラヒックが定常的に多いことがわかっている場合に、LTEの帯域の受信電力を大きく見せるように重み付けをして加算をする(通信方式による重み付け)。
まず、第2の実施の形態を説明する。以下、第1の実施の形態と異なる点を中心に説明を行う。
他セル遷移パラメータ決定部108は、送信電力決定部104により算出された干渉レベルにオフセット値を加算してSintraを決定し、決定したSintraから変換オフセット値を減算してSnonintraを決定し、更に変換オフセット値を減算することによりThreshserving,lowを決定する。上記のオフセット値、変換オフセット値は、予め決定し、他セル遷移パラメータ決定部108に設定(格納)しておくパラメータである。また、これらのパラメータを外部(例:コアネットワーク)から取得し、取得したパラメータを利用してもよい。
次に、第3の実施の形態について説明する。以下、第1の実施の形態と異なる点を中心に説明を行う。
1、2、3 マクロ基地局装置
101 無線受信部
102 周辺セル検出部
103 受信電力測定部
104 送信電力決定部
105 送信電力設定部
106 無線送信部
107 端末状態管理部
108 他セル遷移パラメータ決定部
109 パスロス取得部
110 登録ユーザ情報取得部
200 登録ユーザ情報データベース
Claims (10)
- 送信電力を決定する機能を備えた無線基地局装置であって、
前記無線基地局装置が形成できる対象セルに対して干渉となる周辺セルを検出する周辺セル検出部と、
前記周辺セル検出部により検出された周辺セル毎に、当該周辺セルからの受信電力を測定する受信電力測定部と、
各周辺セルの送信帯域のうち、前記無線基地局装置の送信帯域と重複する帯域部分毎に、当該帯域部分を含む送信帯域を有する周辺セルの受信電力の和を算出し、当該受信電力の和に基づいて前記対象セルにおける干渉量を決定し、当該干渉量を用いて送信電力を決定する送信電力決定部と
を備えたことを特徴とする無線基地局装置。 - 前記送信電力決定部は、前記帯域部分毎に算出された受信電力の和のうちの最大値を、前記対象セルにおける前記干渉量と見なし、当該干渉量を用いて送信電力を決定する
ことを特徴とする請求項1に記載の無線基地局装置。 - 前記送信電力決定部は、前記無線基地局装置に接続されている端末の数を取得し、当該端末の数に基づいて、前記帯域部分毎に算出された受信電力の和の中から、前記対象セルにおける前記干渉量として用いる値を選択し、当該値を用いて送信電力を決定する
ことを特徴とする請求項1又は2に記載の無線基地局装置。 - 前記送信電力決定部は、前記周辺セル検出部により検出された周辺セルの通信方式毎に前記受信電力に重みを付け、前記帯域部分毎に重み付きの受信電力の和を算出し、当該重み付きの受信電力の和の最大値を前記対象セルにおける前記干渉量と見なし、当該干渉量を用いて送信電力を決定する
ことを特徴とする請求項1に記載の無線基地局装置。 - 前記送信電力決定部は、前記帯域部分毎に前記受信電力の和に重みを付け、当該重み付きの受信電力の和の最大値を前記対象セルにおける前記干渉量と見なし、当該干渉量を用いて送信電力を決定する
ことを特徴とする請求項1に記載の無線基地局装置。 - 前記周辺セル検出部は、前記周辺セルを検出する際に、周辺セルの帯域の中心が存在し得る測定ポイントの数よりも少ない数の測定ポイントをサーチする
ことを特徴とする請求項1ないし5のうちいずれか1項に記載の無線基地局装置。 - 前記送信電力決定部により決定された前記干渉量に基づいて、移動端末が他セル遷移を行うために使用するパラメータを決定し、当該パラメータを移動端末に送信する他セル遷移パラメータ決定送信部
を備えることを特徴とする請求項1ないし6のうちいずれか1項に記載の無線基地局装置。 - 前記無線基地局装置に接続する移動端末からの下り方向のパスロスを取得するパスロス取得部を備え、
前記送信電力決定部は、前記パスロス取得部により取得されたパスロスのうち、予め登録された移動端末についてのパスロスに基づいて送信電力を調整する
ことを特徴とする請求項1ないし7のうちいずれか1項に記載の無線基地局装置。 - 無線基地局装置が実行する送信電力決定方法であって、
前記無線基地局装置が形成できる対象セルに対して干渉となる周辺セルを検出する周辺セル検出ステップと、
前記周辺セル検出ステップにより検出された周辺セル毎に、当該周辺セルからの受信電力を測定する受信電力測定ステップと、
各周辺セルの送信帯域のうち、前記無線基地局装置の送信帯域と重複する帯域部分毎に、当該帯域部分を含む送信帯域を有する周辺セルの受信電力の和を算出し、当該受信電力の和に基づいて前記対象セルにおける干渉量を決定し、当該干渉量を用いて送信電力を決定する送信電力決定ステップと
を備えたことを特徴とする送信電力決定方法。 - 前記送信電力決定ステップにおいて、前記無線基地局装置は、前記帯域部分毎に算出された受信電力の和のうちの最大値を、前記対象セルにおける前記干渉量と見なし、当該干渉量を用いて送信電力を決定する
ことを特徴とする請求項9に記載の送信電力決定方法。
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WO2020036884A1 (en) * | 2018-08-13 | 2020-02-20 | Commscope Technologies Llc | Method and system for determining transmission power of radios of a time division duplexing system |
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