JP2008278265A - Mobile communication system, base station apparatus, mobile station apparatus, and scheduling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication system capable of improving the efficiency of using a frequency by adaptively allocating radio resources such as a frequency block, a time slot, a code or a combination of them to a plurality of cells, and to provide a base station device, a mobile station device, and a scheduling method. <P>SOLUTION: The mobile communication system provided with a plurality of base station devices to provide communication services to a mobile station device is provided with: a means for acquiring the information of the using state of radio resources of a peripheral base station device through a mobile station device existing near the peripheral base station device; and a means for preventing the radio resources currently used by the peripheral base station device from being used in a base station device of notice or making it difficult to allocate user data to the radio resources in the base station device of notice on the basis of the acquired information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile communication system, a base station apparatus, a mobile station apparatus, and a scheduling method.

  Since OFDMA (Orthogonal Frequency Division Multiple Access) divides a signal into a large number of subcarriers and performs parallel transmission, high-quality reception characteristics can be realized even in a multipath environment. For this reason, OFDMA is adopted in S3G (Super 3rd Generation) and WiMAX (Worldwide Interoperability for Microwave Access).

  FIG. 1 is a diagram showing an example of frequency block allocation by OFDMA, where (a) shows the signal levels of mobile stations # 1 to # 3 at a certain point in time, and (b) shows each mobile station # 1 to # 3. Shows the frequency block allocation state. That is, a frequency block corresponding to a frequency range where the signal level of the mobile station # 1 is high is allocated to the mobile station # 1, a frequency block corresponding to a frequency range where the signal level of the mobile station # 2 is high is allocated to the mobile station # 2, A frequency block corresponding to a frequency range in which the signal level of mobile station # 3 is high is allocated to mobile station # 3. As described above, in OFDMA, high frequency reception characteristics are obtained by allocating an appropriate frequency block to a mobile station in response to the fact that the frequency range showing good quality differs for each mobile station due to propagation path fluctuation due to multipath. Realized. Since the propagation path varies with time, the frequency block allocation is not fixed, but varies sequentially according to packet scheduling.

Packet scheduling in S3G is performed in the following procedure.
(1) The mobile station measures channel quality (CQI: Channel Quality Indicator) for each frequency unit transmitting one radio resource block, and reports the measured CQI information to the base station through an uplink control channel.
(2) The base station performs scheduling based on CQI information notified from a plurality of mobile stations, and transmits a radio resource block in a subframe that is a minimum unit of a time frame to the mobile station selected by the scheduling.

  In this way, since an optimal frequency block is allocated to each mobile station according to the CQI, a diversity effect (multiuser diversity) between mobile stations can be obtained, and user throughput (one user can transmit without error within a unit time) Data volume) and cell throughput can be improved.

  On the other hand, in a cellular mobile communication system, there is a case where a hierarchical cell configuration is formed in which cells having different sizes such as a macro cell, a micro cell, and a pico cell are overlaid. For example, there is an operation in which a hot spot where traffic is concentrated is covered with a micro cell to absorb high traffic, and the traffic of the macro cell is reduced. In addition, a pico-cell formed in a building etc. by a simple base station, and an ultra-small home base station (Home eNodeB) installed in a user's home to realize a fixed and mobile convergence (FMC) service. The cell formed by (see Non-Patent Document 1 etc.) is also an overlay with the macro cell. Hereinafter, the macro cell is referred to as a large cell, and the overlaid micro cell or pico cell is referred to as a small cell.

In addition, it is assumed that the home base station is connected to a subscriber line such as ADSL (Asymmetric Digital Subscriber Line) instead of a dedicated line. For this reason, it is difficult to exchange information on a wired network (NW: Network) between home base stations and between a home base station and a macro base station (a relatively large base station installed by a telecommunications carrier corresponding to a macro cell). There is a high possibility that the interface is not specified. Even if the interface is defined, information exchange between home base stations and between the home base station and the macro base station is considered to take several tens of seconds, so it cannot be performed frequently.
3GPP TSG RAN # 35 RP-070209 Lemesos, Cyprus, 6-9 March 2007 (http://www.3gpp.org/ftp/tsg_ran/TSG_RAN/TSGR_35/Docs/)

  In the hierarchical cell configuration described above, interference from a large cell with high transmission power to a small cell with low transmission power becomes a problem. FIG. 2 is a diagram showing an example of interference from a macro base station to a home base station. As shown in (a), a small cell of the home base station exists in a large cell of the macro base station, and It is assumed that mobile station # 1 exists in the vicinity and mobile station # 2 exists in a location away from the home base station. Now, assuming that the home base station is communicating with the mobile station # 1, the macro base station communicates with the mobile station # 2, so that the mobile station # 1 is transmitted by a radio signal with a large transmission power from the macro base station. Reception quality deteriorates due to interference. (B) shows SIR (Signal to Interference power Ratio) of the mobile station # 1 and the mobile station # 2, and shows that the SIR of the mobile station # 1 is lowered due to the interference.

  As a solution, it is conceivable to divide both frequency bands, but there are cases where the frequency bands cannot be separated because they are limited. At this time, in the access method that divides and uses the frequency represented by OFDMA as described above, it is conceivable to avoid interference by allocating different frequency blocks in the same band to the large cell and the small cell.

  However, when different frequency blocks are fixedly assigned to the large cell and the small cell, division loss occurs. For example, in the home base station, the number of users accommodated is limited, and when communication with those users is not performed, the frequency block is not used, but if the frequency block is fixedly allocated, the free frequency Blocks cannot be used in large cells.

  A method of avoiding interference by using different time slots in the large cell and the small cell is also conceivable. In this case as well, when a different time slot is fixedly allocated to the large cell and the small cell, a division loss occurs.

  Note that there is a similar problem not only in the relationship between the large cell and the small cell in the hierarchical cell configuration, but also between cells of similar cell sizes.

  The present invention has been proposed in view of the above-described conventional problems, and an object of the present invention is to adaptively allocate radio resources such as frequency blocks, time slots, codes, or combinations thereof to a plurality of cells. It is an object to provide a mobile communication system, a base station apparatus, a mobile station apparatus, and a scheduling method that can improve frequency utilization efficiency by allocating.

  Note that the technique of adaptively allocating frequency blocks to a plurality of cells can be applied to an access scheme that divides and uses a frequency represented by OFDMA. In addition, the method of adaptively allocating time slots to a plurality of cells can be applied to an access method such as TDMA (Time Division Multiple Access) or CDMA (Code Division Multiple Access) that does not divide and use a frequency. You can also. Furthermore, the technique of adaptively allocating codes to a plurality of cells can be applied to CDMA.

  In order to solve the above problems, according to the present invention, there is provided a mobile communication system comprising a plurality of base station apparatuses and providing a communication service to the mobile station apparatus. Means for acquiring usage information of radio resources of the peripheral base station device via a mobile station device existing in the vicinity of the peripheral base station device, and the peripheral base station in the target base station device based on the acquired information The gist of the present invention is a mobile communication system including a unit that cannot use a radio resource that is being used by an apparatus or that makes it difficult to allocate user data to the radio resource.

  In addition, as described in claim 2, in the mobile communication system according to claim 1, so as to acquire, via the mobile station apparatus, information on a usage state of radio resources broadcast by the neighboring base station apparatus. can do.

  Further, as described in claim 3, in the mobile communication system according to claim 1, the peripheral power is measured by interference power measurement in a frequency domain, a time domain, a code domain, or a combination thereof in the mobile station apparatus. It is possible to acquire information on the usage status of radio resources of the base station device.

  In addition, as described in claim 4, in the mobile communication system according to claim 3, the mobile station apparatus is located near the peripheral base station apparatus according to a received power level of a signal from the peripheral base station apparatus. It is possible to determine whether or not there is an interference power and to perform the interference power measurement when it is in the vicinity.

  Further, as described in claim 5, in the mobile communication system according to claim 3, the mobile station apparatus according to a distance obtained from position information of the neighboring base station apparatus and position information of the mobile station apparatus. Is in the vicinity of the surrounding base station apparatus, and when it is in the vicinity, the interference power measurement can be performed.

  In addition, as described in claim 6, a base station apparatus of a mobile communication system, which is based on information on a radio resource usage status of a peripheral base station apparatus notified from the mobile station apparatus, The base station apparatus can be configured as a base station apparatus that includes a unit that cannot use a radio resource that is being used by the base station apparatus or that makes it difficult to allocate user data to the radio resource.

  Further, according to a seventh aspect of the present invention, there is provided a mobile station apparatus of a mobile communication system, means for acquiring information on a usage status of a radio resource of a neighboring base station apparatus, and information on a usage status of the acquired radio resource Can be configured as a mobile station apparatus including a base station apparatus or a means for notifying at least one of the neighboring base station apparatuses other than the information on the usage status of radio resources.

  In addition, as described in claim 8, in the mobile station apparatus according to claim 7, the use status information of the radio resource is obtained by measuring interference power of a signal from the neighboring base station apparatus. To be able to.

  In addition, as described in claim 9, in the mobile station apparatus according to any one of claims 7 and 8, the acquisition timing of the radio resource usage status and the timing of notification of the information are as described above. The determination can be made based on an instruction from the base station apparatus of interest.

  Further, according to a tenth aspect of the present invention, there is provided a method for controlling a mobile communication system, wherein the information on the use status of radio resources of the peripheral base station device is transmitted via a mobile station device that is present in the vicinity of the peripheral base station device. And a step of making it difficult to use the radio resource being used by the neighboring base station apparatus in the target base station apparatus or making it difficult to allocate user data to the radio resource based on the acquired information. It can be configured as a scheduling method.

  In the mobile communication system, base station apparatus, mobile station apparatus, and scheduling method of the present invention, radio resources such as frequency blocks, time slots, codes, or combinations thereof are adaptively allocated to a plurality of cells. Thus, frequency use efficiency can be improved.

  Note that the technique of adaptively allocating frequency blocks, time slots, or combinations thereof to a plurality of cells can be applied to an access scheme that divides and uses a frequency represented by OFDMA. Further, the method of adaptively allocating time slots to a plurality of cells can be applied to an access method such as TDMA or CDMA that does not divide and use a frequency. Furthermore, the technique of adaptively allocating codes to a plurality of cells can be applied to CDMA.

  In addition, the effect can be expected particularly in the case of a large cell and a small cell in a hierarchical cell configuration, but the present invention is not limited to this, and it can also be used to reduce inter-cell interference of the same cell size. Thereby, by occupying different radio resources between adjacent cells, interference can be reduced and good quality can be ensured.

  Hereinafter, preferred embodiments of the present invention will be described.

<First Embodiment>
FIG. 3 is a diagram illustrating a configuration example of the first embodiment.

  In FIG. 3, it is assumed that base station 1 # 1 is a base station focused on as a control target, and mobile station 2 is present in the cell of base station 1 # 1. The base station 1 # 2 is a base station existing around the mobile station 2. In addition, when the relationship between the large cell and the small cell in the hierarchical cell configuration is applied, the base station 1 # 1 is a macro base station and the base station 1 # 2 is a home base station. It may be between stations.

  The base stations 1 # 1 and 1 # 2 have the same configuration, and a radio resource usage status recognition unit 11 that recognizes the usage status of radio resources in the own device and a radio channel recognized by the radio resource usage status recognition unit 11 And a common control channel transmission unit 12 for notifying the mobile station 2 side of the resource usage status through the common control channel.

  In addition, the base stations 1 # 1, 1 # 2 receive the control channel receiving unit 13 that receives information on the usage status of the radio resources of the neighboring base stations, which is notified from the mobile station 2 side through the control channel, and the received radio resources. A scheduler 14 that performs packet scheduling such as OFDMA based on the usage status information, and a shared channel transmission unit 15 that transmits user data to the mobile station 2 side through a shared channel according to the scheduling result.

  On the other hand, the mobile station 2 and the common control channel receiving unit 21 that receives information on the usage status of the radio resources of the neighboring base stations, which are broadcast from the neighboring base station (base station 1 # 2) through the common control channel, Information on the usage status of the radio resource received by the control channel receiving unit 21 is transmitted to at least one of the base stations of interest (base station 1 # 1) or the neighboring base station other than the information on the usage status of the radio resource by the control channel. And a control channel transmission unit 22 for transmission.

  FIG. 4 is a diagram illustrating a processing example of the first embodiment.

  In FIG. 4, the base station (neighboring base station) 1 # 2 notifies the mobile station 2 of the usage status of the radio resource of its own device through the common control channel (step S101).

  The mobile station 2 receives the common control channel from the base station (neighboring base station) 1 # 2 (step S102). At this time, while the mobile station 2 is not communicating with the connected base station, the mobile station 2 performs a normal connection procedure such as establishing frame timing synchronization with the base station (neighboring base station) 1 # 2, and the common control channel Receive. Note that information (frame timing, usage code, etc.) necessary for communication with the neighboring base stations may be held. Further, the connection with the peripheral base station may be performed periodically or triggered by the reception power level of the common control channel of the peripheral base station exceeding a threshold value. Furthermore, the connection with the surrounding base station is triggered by the use of the wireless resource of the focused base station below a certain threshold or when the focused base station is newly established. You may start by doing.

  Next, the mobile station 2 transmits the radio resource usage status of the base station (neighboring base station) 1 # 2 to the base station (target base station) 1 # 1 using the control channel (step S103). This is done by a measurement report or a procedure using a unique frame. Transmission using the control channel may be performed periodically or triggered by the reception power level of the common control channel of the neighboring base station exceeding a threshold value. In addition, transmission by the control channel is triggered by the target base station instructing neighboring base stations when the usage status of the radio resource of the target base station falls below a certain threshold or when the target base station is newly established. May be started.

  In response, base station (target base station) 1 # 1 receives the control channel from mobile station 2 (step S104).

  Next, the base station (target base station) 1 # 1 cannot use at least one of the frequency block, time slot or code used by the base station (neighboring base station) 1 # 2 in the scheduler 14 (FIG. 3). Alternatively, an offset is added to the CQI used for scheduling to make it difficult to allocate to at least one of the frequency block, time slot, or code (step S105).

  5 to 11 are diagrams showing examples of scheduling, and are based on the “Max CIR” algorithm. 5 is an example when the function of the present invention is not used for comparison, and FIGS. 6 to 11 are examples when the function of the present invention is used.

  Max CIR is a method of performing scheduling preferentially from a mobile station having a high frequency block SIR, and conversely, a packet transmission allocation opportunity of a mobile station having a low SIR is reduced.

  In FIG. 5, one OFDM symbol is divided into a plurality of subframes, and a mobile station having the highest SIR is assigned to each subframe. That is, in subframe # 1, mobile station # 1 is allocated for frequency block number 1, mobile station # 2 is allocated for frequency block number 2, and mobile station # 2 is allocated for frequency block number 3. In subframe # 2, mobile station # 1 is assigned to frequency block number 1, mobile station # 2 is assigned to frequency block number 2, and mobile station # 2 is assigned to frequency block number 3. In subframe # 3, mobile station # 1 is assigned to frequency block number 1, mobile station # 3 is assigned to frequency block number 2, and mobile station # 2 is assigned to frequency block number 3.

  FIG. 6 shows an example in which user data is not allocated by disabling frequency blocks used by neighboring base stations. Here, it is assumed that the frequency block number 3 is used by the neighboring base stations, and the allocation of this frequency block is prohibited regardless of the SIR of the mobile station.

  FIG. 7 shows an example when the number of opportunities to allocate to frequency blocks used by neighboring base stations is reduced. Here, it is assumed that the neighboring base station is using the frequency block 3, and it is assumed that only one subframe is allocated to the frequency block, for example, in three subframe times.

  FIG. 8 shows an example in which an offset value is given to the SIR of the frequency block used by the neighboring base station, and user data is allocated only to the frequency block when the SIR exceeds the threshold. Here, it is assumed that the frequency block number 3 is used by the neighboring base station. In FIG. 8, in frequency block number 3 of subframe # 1 and subframe # 2, since there is nothing exceeding a threshold value, allocation is not performed. In addition, in frequency block number 3 of subframe # 3, since SIR of mobile station # 2 exceeds the threshold, allocation is performed to frequency block number 3.

  FIG. 9 shows an example in which user data is not allocated by disabling radio resources used by neighboring base stations. Here, it is assumed that the radio resources in the time slot of frequency block number 3 -subframe number 3 are used by the neighboring base stations, and allocation of these radio resources is prohibited regardless of the SIR of the mobile station.

  FIG. 10 shows an example of a case where opportunities to allocate to radio resources used by neighboring base stations are reduced. Here, it is assumed that the peripheral base station is using radio resources in the time slot of frequency block number 3—subframe numbers 1, 3 and, for example, only 1 radio resource is allocated to 2 radio resources. Not supposed to be. In the figure, since radio resources are allocated to subframe number 1, subframe number 3 is not allocated.

  FIG. 11 shows an example in which an offset value is given to the SIR of the radio resource used by the neighboring base station, and the user data is allocated only when the SIR exceeds the threshold for the radio resource. Here, it is assumed that the neighboring base station is using the radio resource of the time slot of frequency block number 3-subframe numbers 1 and 3. In FIG. 11, the radio resource of frequency block number 3 in subframe # 1 is not allocated because there is nothing exceeding the threshold. In addition, the radio resource of frequency block number 3 in subframe # 3 is allocated because the SIR of mobile station # 2 exceeds the threshold.

  Further, the above-described adaptive radio resource allocation can also be applied to an access method such as TDMA or CDMA that does not use a divided frequency. In the case of TDMA, one time block may be assigned and time slots may be allocated similarly. In CDMA, time slot allocation in TDMA may be replaced with a code.

<Second Embodiment>
FIG. 12 is a diagram illustrating a configuration example of the second embodiment, in which wireless base station radios are measured by measurement at mobile stations in the vicinity of the neighboring base stations, instead of notifying information on the usage status of radio resources from neighboring base stations. It is intended to grasp the resource usage status. This eliminates the need for neighboring base stations to include information on the usage status of radio resources in the common control channel, thereby simplifying the control structure.

  In FIG. 12, the configurations of the base stations 1 # 1 and 1 # 2 are shown in FIG. 3 except that a reference signal transmission unit 16 that transmits a reference signal composed of known symbols for measuring interference power is clearly shown. The configuration is the same. Note that this type of reference signal is normally used for reception power level measurement and propagation path estimation, and is included as a general function of the base station.

  In addition to the common control channel reception unit 21 and the control channel transmission unit 22 described in FIG. 3, the mobile station 2 includes a common control channel reception power level measurement unit 23 that measures the reception power level of the common control channel, a GPS (Global Positioning System) Measured by a GPS receiver 24 (which may be omitted if the corresponding function does not exist in the mobile station 2) and a common control channel received power level measuring unit 23 that measure the position of the device by receiving a signal from a satellite. A peripheral base station proximity determining unit 25 that determines whether or not a peripheral base station (base station 1 # 2) exists in the vicinity from the received power level or the position information measured by the GPS receiver 24 is provided. It is assumed that the position information is included in the common control channel from the neighboring base station (base station 1 # 2) in order to correspond to determining whether or not it is near from the position information by the GPS receiving unit 24.

  The mobile station 2 also includes an interference power measurement unit 26 that measures interference power in the frequency domain, the time domain, the code domain, or a combination thereof using a reference signal from a neighboring base station (base station 1 # 2), A peripheral base station in-use radio resource determination unit 27 that determines the use status of radio resources of the peripheral base station (base station 1 # 2) from the measurement result.

  FIG. 13 is a diagram illustrating a processing example of the second embodiment.

  In FIG. 13, the base station (neighboring base station) 1 # 2 includes the position information of its own device in the common control channel and notifies the mobile station 2 (step S201).

  The mobile station 2 receives the common control channel from the base station (neighboring base station) 1 # 2, and measures the received power level or receives position information (step S202). At this time, while the mobile station 2 is not communicating with the connected base station, the mobile station 2 performs a normal connection procedure such as establishing frame timing synchronization with the base station (neighboring base station) 1 # 2, and the common control channel Receive. Note that information (frame timing, usage code, etc.) necessary for communication with the neighboring base stations may be held. Further, the connection with the peripheral base station may be performed periodically or triggered by the reception power level of the common control channel of the peripheral base station exceeding a threshold value. Furthermore, the connection with the surrounding base station is triggered by the use of the wireless resource of the focused base station below a certain threshold or when the focused base station is newly established. You may start by doing.

  Then, the mobile station 2 determines whether or not the base station (neighboring base station) 1 # 2 is in the vicinity (step S203). Here, when determining whether or not the reception power level of the common control channel is in the vicinity, if the reception power level of the common control channel is equal to or greater than a predetermined threshold, it is determined that the signal is in the vicinity. Further, when determining from the position information, the distance is determined from the positions of the base station 1 # 2 and the mobile station 2, and if it is equal to or less than a predetermined threshold, it is determined to be near. As a result of the determination, if it is determined that the base station 1 # 2 is not in the vicinity of the mobile station 2, the process is terminated (step S204). The reason why the base station 1 # 2 is in the vicinity of the mobile station 2 is used as a condition for the subsequent processing. When determining the radio resource in use based on the interference power, an erroneous determination is made based on the interference power due to other factors. This is to eliminate the possibility.

  Next, when the mobile station 2 determines that the base station 1 # 2 is in the vicinity of the mobile station 2, the mobile station 2 measures interference power in the frequency domain, the time domain, the code domain, or a combination thereof (step S205). Based on the measurement result, the radio resource being used by the base station (neighboring base station) 1 # 2 is determined (step S206).

  Next, the mobile station 2 transmits information on the usage status of radio resources of the base station (neighboring base station) 1 # 2 to the base station (target base station) 1 # 1 through the control channel (step S207). This is done by measurement reports or by procedures using a unique frame. Transmission using the control channel may be performed periodically or triggered by the reception power level of the common control channel of the neighboring base station exceeding a threshold value. In addition, transmission by the control channel is triggered by the target base station instructing neighboring base stations when the usage status of the radio resource of the target base station falls below a certain threshold or when the target base station is newly established. May be started.

  In response, the base station (target base station) 1 # 1 receives the control channel from the mobile station 2 (step S208).

  Next, the base station (target base station) 1 # 1 cannot use at least one of the frequency block, time slot or code used by the base station (neighboring base station) 1 # 2 in the scheduler 14 (FIG. 3). Alternatively, an offset is added to the CQI used for scheduling to make it difficult to perform allocation to at least one of the frequency block, time slot, or code (step S209).

  Subsequent scheduling processing is the same as that shown in FIGS.

<Summary>
As described above, the embodiment of the present invention has the following advantages.
(1) Inter-base station interference can be reduced by scheduling the allocation of radio resources in consideration of the usage status of neighboring base stations related to radio resources such as frequency blocks, time slots, codes, or combinations thereof. it can.
(2) In particular, it is possible to reduce interference between a macro base station and a home base station, where the influence of interference is serious due to the difference in cell size.
(3) It can also be used to reduce inter-cell interference having the same cell size, and by occupying different radio resources between adjacent cells, interference can be reduced and good quality can be ensured.
(4) As described above, it is difficult to exchange information in the wired network between home base stations and between the home base station and the macro base station, and there is a high possibility that the interface is not defined. Since it does not use the exchange of information in the network, it has a high affinity.
(5) When measuring the reception power level of the common control channel of the neighboring base stations, this type of measurement has been performed conventionally, so that no new mechanism is required.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments, various modifications and changes may be made to the embodiments without departing from the broad spirit and scope of the invention as defined in the claims. Obviously you can. In other words, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

It is a figure which shows the example of allocation of the frequency block by OFDMA. It is a figure which shows the example of the interference from a macro base station to a home base station. It is a figure which shows the structural example of 1st Embodiment. It is a figure which shows the process example of 1st Embodiment. It is a figure (the 1) which shows the example of scheduling. It is a figure (the 2) which shows the example of scheduling. FIG. 10 is a diagram illustrating an example of scheduling (part 3); FIG. 10 is a diagram (part 4) illustrating an example of scheduling; FIG. 10 is a diagram illustrating an example of scheduling (part 5); FIG. 10 is a diagram illustrating an example of scheduling (part 6); FIG. 11 is a diagram illustrating an example of scheduling (part 7); It is a figure which shows the structural example of 2nd Embodiment. It is a figure which shows the process example of 2nd Embodiment.

Explanation of symbols

1 # 1, 1 # 2 Base station 11 Radio resource usage status recognition unit 12 Common control channel transmission unit 13 Control channel reception unit 14 Scheduler 15 Shared channel transmission unit 16 Reference signal transmission unit 2 Mobile station 21 Common control channel reception unit 22 Control Channel transmission unit 23 Common control channel reception power level measurement unit 24 GPS reception unit 25 Neighboring base station vicinity determining unit 26 Interference power measuring unit 27 Radio resource determining unit in use of neighboring base station

Claims (10)

A mobile communication system comprising a plurality of base station devices and providing communication services to mobile station devices,
Means for acquiring information on the use status of radio resources of the peripheral base station device via a mobile station device existing in the vicinity of the peripheral base station device;
Based on the acquired information, the base station device of interest comprises means for making the radio resources being used by the neighboring base station devices unusable or making it difficult to allocate user data to the radio resources Mobile communication system. The mobile communication system according to claim 1, wherein
A mobile communication system, characterized in that information on a radio resource usage status broadcast by the neighboring base station device is acquired via the mobile station device. The mobile communication system according to claim 1, wherein
A mobile communication system, characterized in that information on a radio resource usage status of the neighboring base station apparatus is obtained by measuring interference power in a frequency domain, a time domain, a code domain, or a combination thereof in the mobile station apparatus. The mobile communication system according to claim 3,
Based on the received power level of the signal from the peripheral base station device, determine whether the mobile station device is in the vicinity of the peripheral base station device,
A mobile communication system, characterized in that the interference power measurement is performed in the vicinity. The mobile communication system according to claim 3,
Based on the distance obtained from the location information of the neighboring base station device and the location information of the mobile station device, determine whether the mobile station device is in the vicinity of the neighboring base station device,
A mobile communication system, characterized in that the interference power measurement is performed in the vicinity. A base station apparatus for a mobile communication system,
Based on the information on the radio resource usage status of the neighboring base station device notified from the mobile station device, the radio resource being used by the neighboring base station device cannot be used in the own device, or user data is allocated to the radio resource. A base station apparatus comprising means for making it difficult to perform. A mobile station apparatus of a mobile communication system,
Means for acquiring information on the usage status of radio resources of the peripheral base station device;
A mobile station comprising means for notifying at least one of the base station apparatus of interest or the information on the usage state of the acquired radio resource to a target base station apparatus or a neighboring base station apparatus other than receiving the information on the usage state of the radio resource apparatus. In the mobile station apparatus of Claim 7,
The radio station usage information is obtained by measuring interference power of signals from the neighboring base station devices. In the mobile station apparatus as described in any one of Claim 7 or 8,
The mobile station apparatus characterized in that the acquisition timing of the radio resource use status information and the notification timing of the information are determined based on an instruction from the base station apparatus of interest. A control method for a mobile communication system, comprising:
Via a mobile station device existing in the vicinity of the peripheral base station device, obtaining information on the usage status of the radio resources of the peripheral base station device;
And a step of making it difficult to use a radio resource being used by the neighboring base station apparatus in the target base station apparatus or making it difficult to allocate user data to the radio resource based on the acquired information. Scheduling method.

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