JP2006253924A - Mobile station apparatus, base station apparatus, control station apparatus, and base station apparatus selection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the throughput of a plurality of mobile station apparatuses in a system adopting a communication method where a plurality of the mobile station apparatuses share resources. <P>SOLUTION: A cell selection section 105 compares resource allocation probability information notified from respective base station apparatuses and selects a base station apparatus corresponding to a maximum resource allocation probability as a selected base station apparatus. The resource allocation probability is a degree of expectation for allocating a resource to the mobile station apparatuses by each base station apparatus. That is, the base station apparatus with the highest resource allocation probability is used for the selected base station apparatus on the basis of the resource allocation probabilities notified from the respective base station apparatuses, so that the probability that an individual data signal is transmitted to each mobile station apparatus is increased thereby the throughput of each mobile station apparatus is increased. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile station device, a base station device, a control station device, and a base station device selection method, and in particular, a mobile station device and a base station device in a system to which a communication scheme in which a plurality of mobile station devices share resources is applied. The present invention relates to a control station apparatus and a base station apparatus selection method.

  In recent years, when a mobile station apparatus is located in an area near the boundary of a plurality of cells or sectors (hereinafter referred to as a “handover area”), a base station apparatus or antenna that is a communication partner is It has been studied to perform fast cell selection (FCS: Fast Cell Selection) that switches at high speed in a short period such as a slot (for example, see Non-Patent Document 1).

  FIG. 10A is a diagram illustrating an example of the selection operation of the base station device by FCS. As shown in the figure, the mobile station apparatus 10 switches the base station apparatus 20 and the base station apparatus 30 in order from the first slot 40 as communication partners.

  Specifically, the mobile station apparatus 10 receives a common pilot channel signal (hereinafter referred to as “common pilot signal”) transmitted from the base station apparatus 20 and the base station apparatus 30, and receives a received SINR (Signal to Interference plus). Noise Ratio (signal to interference noise ratio) is measured. The measurement result is shown in FIG. In the figure, the solid line indicates the reception SINR of the signal from the base station apparatus 20, and the dotted line indicates the reception SINR of the signal from the base station apparatus 30.

  Then, the mobile station apparatus 10 selects a base station apparatus having a large received SINR for each slot, and information on the selected base station apparatus (hereinafter referred to as “selected base station apparatus”) is transmitted to the base station apparatus 20 and the base station apparatus 30. Send to. Here, the selected base station apparatus for each slot is indicated by a solid line (that is, base station apparatus 20) and a dotted line (that is, base station apparatus 30) in the lower part of FIG.

  The base station device 20 and the base station device 30 receive information related to the selected base station device from the mobile station device 10, and the selected base station device for each slot is an individual channel or a high speed in the slot indicated by the hatched line in FIG. A data signal (hereinafter referred to as “individual data signal”) such as a packet channel is transmitted.

  As described above, the mobile station apparatus 10 located in the handover area switches the selected base station apparatus in a short cycle such as a slot, whereby the throughput in the mobile station apparatus 10 can be improved.

Further, for example, Patent Document 1 describes a technology in which a base station device notifies a traffic amount, and a mobile station device located in a handover region switches a selected base station device based on the traffic amount notified from each base station device. Has been.
"Physical layer aspects of UTRA High Speed Downlink Packet Access" (Section 6.4), 3GPP TR25.848 V4.4.0 (2001-03) JP 2003-264869 A

  However, in a system to which a communication method in which a plurality of mobile station apparatuses share resources (such as time, frequency, code, or a combination thereof) is applied, the mobile station apparatus selects based on the FCS and traffic volume as described above. Even if the base station apparatus is switched, it is not always possible to improve the throughput of the mobile station apparatus.

  That is, in a communication system in which a plurality of mobile station apparatuses share resources, only one mobile station apparatus can use a certain resource at a certain time in principle. That is, when a plurality of mobile station apparatuses select the same base station apparatus as the selected base station apparatus, in principle, resources are allocated to only one mobile station apparatus. At this time, the base station apparatus allocates resources to the mobile station apparatus having the best received SINR among the mobile station apparatuses selected as the selected base station apparatus. Therefore, even if a base station apparatus is selected based solely on the received SINR and traffic volume of the received signal, resources are not always allocated from the selected base station apparatus, and throughput in the mobile station apparatus is improved. There is a problem that there is not.

  The present invention has been made in view of the above points, and in a system to which a communication scheme in which a plurality of mobile station apparatuses share resources is applied, a mobile station apparatus and a base station that can improve throughput in the mobile station apparatus An object is to provide a device, a control station device, and a base station device selection method.

  A mobile station apparatus according to the present invention is a mobile station apparatus that selects a base station apparatus to be a communication partner from a plurality of base station apparatuses, and the reception quality of a signal from the base station apparatus is the same as that of the mobile station apparatus On the other hand, an acquisition means for acquiring an allocation expectation level indicating the frequency or amount of resources actually allocated by the base station device in the past for each of the plurality of base station devices, and a base with the highest allocation expectation level acquired. And a selection means for selecting a station device.

  According to this configuration, since the base station apparatus having the highest allocation expectation obtained from the past resource allocation situation is selected as the communication partner, communication is actually performed not only for the reception quality but also for the mobile station apparatus. A base station apparatus with high possibility can be selected, and the throughput in the mobile station apparatus can be improved.

  The base station apparatus according to the present invention includes an acquisition unit that acquires reception quality in a mobile station apparatus in a cell covered by the own apparatus, and an allocation unit that allocates resources to the mobile station apparatus according to the acquired reception quality; A calculation means for calculating, for each reception quality, an expected allocation degree indicating a frequency or amount of resources actually allocated in the past for a mobile station apparatus having reception quality equivalent to the acquired reception quality Take.

  According to this configuration, in order to calculate the allocation expectation for each reception quality from the result of past resource allocation, the mobile station apparatus is not only the magnitude of the reception quality but also the average traffic volume in the base station apparatus. A communication partner can be selected according to the considered allocation expectation, and the throughput in the mobile station apparatus can be improved.

  A control station apparatus according to the present invention is a control station apparatus that selects a base station apparatus that is a communication partner of a mobile station apparatus from a plurality of base station apparatuses, and the reception quality of a signal from the base station apparatus is the mobile station apparatus Acquisition means for acquiring, for each of the plurality of base station apparatuses, an allocation expectation degree indicating the frequency or amount of resources actually allocated by the base station apparatus in the past to the mobile station apparatus equivalent to And a selection unit that selects a base station apparatus having the highest expectation.

  A base station apparatus selection method according to the present invention is a base station apparatus selection method for selecting a base station apparatus that is a communication partner of a mobile station apparatus from a plurality of base station apparatuses, and the reception quality of a signal from the base station apparatus is high. Obtaining, for each of the plurality of base station devices, an allocation expectation level indicating the frequency or amount of resource allocation by the base station device in the past for a mobile station device equivalent to the mobile station device; And a step of selecting a base station apparatus having the highest allocation expectation.

  According to these, since the base station apparatus with the highest allocation expectation obtained from the past resource allocation situation is selected as the communication partner, communication with the mobile station apparatus can be actually performed, not just the reception quality. A base station apparatus with high performance can be selected, and throughput in the mobile station apparatus can be improved.

  According to the present invention, in a system to which a communication scheme in which a plurality of mobile station apparatuses share resources is applied, throughput in the mobile station apparatus can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing an example of a configuration of a mobile communication system according to Embodiment 1 of the present invention. As shown in the figure, the mobile station device 100 located in the region (handover region) near the boundary between the cell 200a covered by the base station device 200 and the cell 300a covered by the base station device 300 is a communication partner candidate. A common pilot signal transmitted from both base station apparatus 200 and base station apparatus 300 is received. In addition, the mobile station device 100 switches either the base station device 200 or the base station device 300 as a communication partner for each short time unit such as a slot. Note that a plurality of mobile station devices (not shown) are located in the cell 200a and the cell 300a, and each mobile station device has the same configuration as the mobile station device 100.

  FIG. 2 is a block diagram showing a main configuration of mobile station apparatus 100 according to the present embodiment. The mobile station apparatus 100 shown in FIG. 2 includes an RF (Radio Frequency) receiving unit 101, demodulation units 102-1 and 102-2, error correction decoding units 103-1 and 103-2, a separation unit 104-1. 104-2, cell selection unit 105, reception quality measurement units 106-1 and 106-2, reception quality information generation units 107-1 and 107-2, multiplexing unit 108, error correction coding unit 109, modulation unit 110, and An RF transmission unit 111 is included. In the present embodiment, it is assumed that mobile station apparatus 100 is located near the boundary between two cells, cell 200a and cell 300a, so that it corresponds to two base station apparatuses that are communication partner candidates. Two demodulation units, error correction decoding units, separation units, reception quality measurement units, and reception quality information generation units are provided. Therefore, when the mobile station device 100 is located near the boundary of three or more cells, the above-described processing units may be provided corresponding to three or more base station devices that are communication partner candidates. In the following description, demodulation section 102-1, error correction decoding section 103-1, and separation section 104-1 are processing sections for signals transmitted from the base station apparatus (selected base station apparatus) selected as the communication partner. Demodulation section 102-2, error correction decoding section 103-2, and separation section 104-2 will be described as processing sections for signals transmitted from base station apparatuses other than the selected base station apparatus.

  The RF reception unit 101 performs radio reception processing (down-conversion, A / D conversion, etc.) on the signal received via the antenna, and the received demodulated signals are demodulated by the demodulation units 102-1 and 102-2. Output to.

  Demodulation sections 102-1 and 102-2 demodulate the signals subjected to reception processing, and output the obtained demodulated signals to error correction decoding sections 103-1 and 103-2, respectively.

  Error correction decoding sections 103-1 and 103-2 perform error correction decoding on the demodulated signals demodulated by the respective demodulation sections 102-1 and 102-2, and obtain the obtained error correction decoded data, respectively. The data is output to the separation units 104-1 and 104-2.

  Separating sections 104-1 and 104-2 extract resource allocation probability information notified from each base station apparatus from error-correction decoded data subjected to error correction decoding, and outputs the information to cell selection section 105. Separation section 104-1 extracts the received data from the error correction decoded data and outputs it to the subsequent process.

  The cell selection unit 105 compares information on the resource allocation probability notified from each base station device (hereinafter referred to as “resource allocation probability information”), and selects the base station device corresponding to the maximum resource allocation probability. Select as. Here, the resource allocation probability refers to an expected degree of allocation at which resources are allocated from the base station apparatus to the mobile station apparatus. That is, the probability that an individual data signal is transmitted to the mobile station apparatus by setting the base station apparatus having the highest resource allocation probability based on the resource allocation probability notified from each base station apparatus as the selected base station apparatus And the throughput of the mobile station apparatus can be improved. A specific method for calculating the resource allocation probability by each base station apparatus will be described later. Cell selection section 105 outputs information on the selected base station apparatus (hereinafter referred to as “selected cell information”) to multiplexing section 108.

  Reception quality measuring sections 106-1 and 106-2 use the common pilot signal notified from each base station apparatus to measure SINR as an indicator of the state of the propagation path, and obtain the obtained SINR measurement results, respectively. Output to reception quality information generation sections 107-1 and 107-2.

  Reception quality information generation sections 107-1 and 107-2 generate reception quality information including information on CQI (Channel Quality Indicator) according to SINR from the measurement results of SINR between the respective base station apparatuses, The data is output to the multiplexing unit 108. Here, the reception quality information including information on the CQI is notified to each base station apparatus from the multiplexing unit 108 (to be described later) via the RF transmission unit 111 at a predetermined cycle.

  Multiplexer 108 multiplexes transmission data, selected cell information, and reception quality information, and outputs the obtained multiplexed data to error correction encoder 109.

  The error correction coding unit 109 performs error correction coding on the multiplexed data and outputs the obtained error correction coded data to the modulation unit 110.

  Modulation section 110 modulates error correction encoded data and outputs the obtained modulated data to RF transmission section 111.

  The RF transmission unit 111 performs predetermined wireless transmission processing (D / A conversion, up-conversion, etc.) on the modulated data, and transmits the modulated data via an antenna.

  FIG. 3 is a block diagram showing a main configuration of base station apparatus 200 according to the present embodiment. 3 includes an RF reception unit 201, a demodulation unit 202, an error correction decoding unit 203, a separation unit 204, a selected cell determination unit 205, a resource allocation unit 206, a resource allocation probability calculation unit 207, and a resource allocation probability. An acquisition unit 208, a multiplexing unit 209, an error correction coding unit 210, a modulation unit 211, and an RF transmission unit 212 are included.

  The RF reception unit 201 performs wireless reception processing (down-conversion, A / D conversion, etc.) on the signal received via the antenna, and outputs the obtained reception signal to the demodulation unit 202.

  Demodulation section 202 demodulates the received signal and outputs the obtained demodulated signal to error correction decoding section 203.

  Error correction decoding section 203 performs error correction decoding on the demodulated signal and outputs the obtained error correction decoded data to separation section 204.

  Separating section 204 extracts received data, selected cell information, and received quality information from the error correction decoded data. Separation section 204 then outputs the received data to a subsequent process, outputs selected cell information to selected cell determination section 205, and receives reception quality information from resource allocation section 206, resource allocation probability calculation section 207, and resource allocation. Output to the probability acquisition unit 208.

  The selected cell determination unit 205 determines whether or not the own cell is selected as the selected base station device from the selected cell information notified from a plurality of mobile station devices. When the own device is the selected base station device, the fact is output to the resource assignment unit 206.

  The resource allocation unit 206 allocates resources to the mobile station apparatus that has selected its own apparatus as the selected base station. In addition, when the selected cell information indicating that the own apparatus is the selected base station apparatus is notified from a plurality of mobile station apparatuses, the resource allocating unit 206 has a large CQI value included in the reception quality information. Allocate resources for the device. Resource allocation section 206 then outputs the CQI value of the mobile station apparatus to which the resource is allocated to resource allocation probability calculation section 207. That is, every time a resource is allocated, resource allocation section 206 outputs the CQI value of the mobile station apparatus to which the resource is allocated to resource allocation probability calculation section 207. Then, the resource allocation unit 206 outputs information on the allocated resource (hereinafter referred to as “resource allocation information”) to the multiplexing unit 209, the modulation unit 211, and the RF transmission unit 212.

  For each CQI value, the resource allocation probability calculation unit 207 counts the number of allocated resources within the period of counting the number of CQI notifications, and the number of allocated resources among the number of CQI notifications The resource allocation probability is calculated from the ratio. Hereinafter, the calculation of the resource allocation probability will be specifically described.

  As described above, the mobile station apparatus 100 receives the common pilot signal transmitted from both the base station apparatus 200 and the base station apparatus 300 and measures the SINR. From the SINR measurement results with each base station apparatus, Reception quality information including information on CQI according to SINR is generated. And the obtained reception quality information is notified to each base station apparatus for every predetermined period.

  Similarly, other mobile station devices located in the cell 200a notify the base station device 200 of reception quality information with the base station device 200 every predetermined period, and other mobile station devices located in the cell 300a From the mobile station apparatus, reception quality information with the base station apparatus 300 is notified to the base station apparatus 300 at predetermined intervals.

  Base station apparatus 200 counts the number of CQIs notified from all mobile station apparatuses including mobile station apparatus 100 located in cell 200a covered by base station apparatus 200 for each CQI value. That is, the number of notified CQIs serves as an index of the number of mobile station apparatuses located in the cell 200a. Then, by counting the number of CQI notifications for each CQI value, the resource allocation probability calculation unit 207 grasps the number of mobile station apparatuses located in the cell 200a for each CQI, that is, for each reception quality. To do. Counting the number of CQIs notified may be performed every predetermined period, or may be continuously performed from a predetermined time point.

  On the other hand, every time a resource is allocated to a certain mobile station apparatus, the resource allocation unit 206 outputs the CQI value of the mobile station apparatus to which the resource is allocated. That is, when the CQI value is output from the resource assignment unit 206, it means that the resource is assigned to the mobile station apparatus that has notified the CQI value. Then, for each CQI value, the resource allocation probability calculation unit 207 counts the number of allocated resources within the period of counting the number of CQI notifications, and the resource is allocated among the number of CQI notified. The resource allocation probability is calculated from the ratio of the number.

Here, whether or not resources are allocated to a certain mobile station apparatus is determined by the relationship between the reception quality and traffic volume of the mobile station apparatus located in the cell of the selected base station apparatus. For example, when the CQI notified from the mobile station apparatus 100 to the base station apparatus 200 is CQI _100-200 and the CQI notified from the mobile station apparatus 100 to the base station apparatus 300 is CQI _100-300 , CQI _100-200 < Consider a case where the relationship is CQI _100-300 . Here, the larger the value of CQI, the better the reception quality with the corresponding base station apparatus. That is, when CQI _100-200 <CQI _100-300 , the reception quality between mobile station apparatus 100 and base station apparatus 300 is higher than the reception quality between mobile station apparatus 100 and base station apparatus 200. Means good.

However, when there is another mobile station apparatus that notifies a CQI larger than the CQI _100-300 value in the cell 300a, the base station apparatus 300 allocates resources to the other mobile station apparatuses with a larger CQI value. On the other hand, when there is no other mobile station apparatus that notifies CQI larger than the value of CQI _100-200 in cell 200a, base station apparatus 200 allocates resources to mobile station apparatus 100. That is, even if the relationship CQI _100-200 <CQI _100-300 is satisfied, when the base station device 300 is selected as the selected base station device, resources are not allocated to the mobile station device 100 and the base station device 200 is selected. When the base station apparatus is used, resources may be allocated to the mobile station apparatus 100. Further, if the traffic volume in the cell 200a of the base station apparatus 200 is small, there is a high possibility that the CQI _100-200 becomes the largest CQI in the cell 200a. When the CQI _100-200 is the largest in the cell 200a, resources are allocated to the mobile station device 100. Thus, whether or not resources are allocated to a certain mobile station apparatus depends on the reception quality and traffic volume of the mobile station apparatus located in the cell of the selected base station apparatus.

  Therefore, the mobile station apparatus selects the base station apparatus with the highest resource allocation probability as the selected base station, and considers the relationship between the reception quality and traffic volume of other mobile station apparatuses in the cell of the base station apparatus. The selected base station apparatus having the highest possibility of resource allocation from the base station apparatus is selected. Thereby, the possibility that an individual data signal is transmitted from the corresponding selected base station apparatus to the mobile station apparatus increases, and as a result, the throughput of the mobile station apparatus can be improved. The resource allocation probability calculation unit 207 outputs the obtained resource allocation probability to the resource allocation probability acquisition unit 208.

  Note that the resource allocation probability calculation unit 207 may calculate the resource allocation probability for each QoS (Quality of Service) required for each service (voice, image, etc.) provided by the communication system. Thereby, the mobile station apparatus can select the selected base station apparatus using the resource allocation probability corresponding to the service provided by the communication system.

  The resource allocation probability acquisition unit 208 holds a resource allocation probability table in which CQIs are associated with the above-described resource allocation probabilities. FIG. 4 shows an example of the resource allocation probability table. As shown in the figure, the resource allocation probability table adopts a configuration in which CQIs are associated with resource allocation probabilities. Then, the resource allocation probability acquisition unit 208 acquires the resource allocation probability corresponding to the CQI included in the reception quality information output from the separation unit 204 from the resource allocation probability table. The resource allocation probability acquisition unit 208 outputs information on the acquired resource allocation probability (resource allocation probability information) to the multiplexing unit 209. Further, when the resource allocation probability calculation unit 207 outputs the resource allocation probability, the resource allocation probability acquisition unit 208 updates the resource allocation probability table.

  Multiplexer 209 multiplexes resource allocation information corresponding to the mobile station apparatus to which the resource is allocated, transmission data, and resource allocation probability information corresponding to the CQI of each mobile station apparatus (time multiplexing, etc.) The multiplexed data is output to error correction coding section 210.

  The error correction encoding unit 210 performs error correction encoding on the data output from the multiplexing unit 209 and outputs the obtained error correction encoded data to the modulation unit 211.

  The modulation unit 211 modulates the error correction encoded data and outputs the obtained modulation data to the RF transmission unit 212.

  The RF transmission unit 212 performs predetermined wireless transmission processing (D / A conversion, up-conversion, etc.) on the modulated data and transmits the modulated data via an antenna.

  Next, the base station apparatus selection operation by the mobile station apparatus 100, the base station apparatus 200, and the base station apparatus 300 configured as described above will be described with reference to the sequence diagram shown in FIG.

  First, a common pilot signal (not shown) is transmitted from the base station apparatus 200, and similarly, a common pilot signal (not illustrated) is transmitted from the base station apparatus 300. These common pilot signals are received by the RF receiving unit 101 via the antenna of the mobile station apparatus 100. Each received common pilot signal is subjected to predetermined radio reception processing (down-conversion, A / D conversion, etc.), and then received reception measurement via demodulating sections 102-1 and 102-2, respectively. Are output to sections 106-1 and 106-2. Then, the reception quality measuring sections 106-1 and 106-2 measure the reception quality of the propagation path between the base station apparatus 200 and the base station apparatus 300 (401). The measured reception quality measurement results are output to reception quality information generation sections 107-1 and 107-2, respectively. And reception quality information including information about CQI corresponding to the reception quality measurement result is generated from reception quality measurement results with the respective base station apparatuses by reception quality information generation sections 107-1 and 107-2. Is done. The reception quality information is subjected to predetermined radio transmission processing (D / A conversion, up-conversion, etc.) and then both the base station device 200 and the base station device 300, or the base station device 200 or the base station device 300. (402). In FIG. 5, reception quality information 403 is notified to the base station apparatus 200, and reception quality information 404 is notified to the base station apparatus 300. The reception quality information 403 includes information on CQI corresponding to the reception quality of the propagation path with the base station apparatus 200, and the reception quality information 404 includes information between the base station apparatus 300 and the reception quality information 403. Information on CQI corresponding to the reception quality of the propagation path is included. When reception quality information 403 and reception quality information 404 are notified to only one of base station apparatus 200 or base station apparatus 300, the received base station apparatus receives reception quality information corresponding to another base station apparatus. Forward.

  Then, based on the reception quality information 403 and the reception quality information 404, the resource allocation probability acquisition unit 208 of the base station apparatus 200 and the base station apparatus 300 respectively relates to the resource allocation probabilities corresponding to the reception quality information 403 and the reception quality information 404, respectively. Information is acquired (405, 406). Specifically, resource allocation probability information corresponding to CQI included in reception quality information 403 and reception quality information 404 is acquired from a resource allocation probability table held by resource allocation probability acquisition section 208. The acquired resource allocation probability information is subjected to predetermined transmission processing from the multiplexing unit 209 of the base station device 200 and the base station device 300 via the RF transmission unit 212 (407, 408), and then the respective base stations The mobile station apparatus 100 is notified from the apparatus. Alternatively, the resource allocation probability information is transferred to one of the base station apparatuses, and the resource allocation probability is notified from the transferred base station apparatus to the mobile station apparatus 100. In FIG. 5, resource allocation probability information 409 is notified from the base station apparatus 200 to the mobile station apparatus 100, and resource allocation probability information 410 is notified from the base station apparatus 300 to the mobile station apparatus 100. Similarly, corresponding resource allocation probability information is also notified to a mobile station apparatus located in a handover area other than the mobile station apparatus 100.

  The cell selection unit 105 of the mobile station apparatus 100 selects a base station apparatus corresponding to a higher resource allocation probability from resource allocation probabilities transmitted from a plurality of base station apparatuses (411). The base station apparatus transfers each resource allocation probability to the control station which is a higher station, and corresponds to a higher resource allocation probability among resource allocation probabilities transferred from a plurality of base station apparatuses by the control station. A base station device may be selected.

  As described above, the resource allocation probability is an index indicating the relationship between the reception quality and traffic volume of the mobile station device in the cell of the base station device. That is, a high resource allocation probability means that there is a high possibility that the reception quality of the mobile station device 100 is better than other mobile station devices. The smaller the amount of traffic, the higher the resource allocation probability. On the other hand, a low resource allocation probability means that there is a high possibility that the reception quality of the mobile station device 100 is worse than the reception quality of other mobile station devices. And the greater the amount of traffic, the lower the resource allocation probability. Therefore, the mobile station apparatus 100 increases the probability that an individual data signal is transmitted from the selected base station apparatus to the mobile station apparatus 100 by setting the base station apparatus having the highest resource allocation probability as the selected base station apparatus. Then, by transmitting the individual data signal to the mobile station device, the throughput of the mobile station device can be improved. In the following description, it is assumed that the cell selection unit 105 has selected the base station apparatus 200 as the selected base station apparatus.

  The selected cell information regarding the selected base station apparatus is notified to the base station apparatus 200 and the base station apparatus 300 after a predetermined radio transmission process (412) is performed. As described above, when the control station selects a base station apparatus, the selected cell information is notified from the control station to the base station apparatus 200 and the base station apparatus 300. In FIG. 5, the selected cell information 413 is notified to the base station apparatus 200, and the selected cell information 414 is notified to the base station apparatus 300. The contents of the selected cell information 413 and the selected cell information 414 are the same, indicating that the base station apparatus 200 has been selected as the selected base station apparatus.

  Based on the selected cell information 413 and the selected cell information 414, the base station device 200 and the base station device 300 respectively determine whether the own device is the selected base station device in the selected cell determination unit 205 (415). In FIG. 5, base station apparatus 200 determines that its own apparatus has become the selected base station apparatus. At this time, there may be a case where there are a plurality of mobile station apparatuses that have selected the base station apparatus 200 as a selected base station apparatus. However, in the following, resources are allocated to the mobile station apparatus 100 by the resource allocation unit 206 of the base station apparatus 200. Is assigned (416). Then, the resource allocation unit 206 outputs the CQI notified from the mobile station apparatus to which the resource is allocated to the resource allocation probability calculation unit 207, and the resource allocation probability calculation unit 207 calculates the resource allocation probability.

  As described above, for each CQI value, the resource allocation probability counts the number of allocated resources within the period of counting the number of notified CQIs, and resources are allocated among the number of notified CQIs. Calculate from the ratio of the number. Counting the number of CQIs notified may be performed every predetermined period, or may be continuously performed from a predetermined time point. Then, the resource allocation probability calculation unit 207 outputs the resource allocation probability information to the resource allocation probability acquisition unit 208. When the resource allocation probability calculation unit 207 outputs the resource allocation probability information, the resource allocation probability acquisition unit 208 updates the resource allocation probability table.

  The base station apparatus 200 allocates resources to the mobile station apparatus 100 by the resource allocation unit 206, performs a predetermined transmission process (417), and transmits resource allocation information 418 related to the allocated resources to the mobile station apparatus 100. Send. Next, base station apparatus 200 performs a predetermined transmission process (419) and transmits individual data signal 420 to mobile station apparatus 100. Note that base station apparatus 200 does not transmit resource allocation information and individual data signals to mobile station apparatuses other than mobile station apparatus 100 to which resources are not allocated. Also, the base station apparatus 300 that has not become the selected base station apparatus does not transmit the resource allocation information and the individual data signal to the mobile station apparatus 100 (421). The individual data signal 420 transmitted from the base station apparatus 200 is subjected to predetermined reception processing by the RF reception unit 101, the demodulation unit 102-1, the error correction decoding unit 103-1, and the separation unit 104-1 of the mobile station device 100. (422), and received data is obtained.

  As described above, according to the present embodiment, based on the resource allocation probability information transmitted from a plurality of base station apparatuses, the base station apparatus with the highest resource allocation probability is set as the selected base station apparatus. For this reason, the possibility that an individual data signal is transmitted from the corresponding selected base station apparatus to the mobile station apparatus increases, and as a result, the throughput of the mobile station apparatus is improved.

  Note that the cell selection unit 105 determines whether or not the reception quality between each of the base station apparatuses measured by the reception quality measurement units 106-1 and 106-2 is greater than a predetermined threshold, and receives the reception quality. A base station device having a higher resource allocation probability may be selected as a selected base station device from among base station devices having a value greater than a predetermined threshold. Accordingly, when resources are allocated from the selected base station apparatus, the mobile station apparatus can avoid transmission errors and reliably receive individual data, and can improve throughput in the mobile station apparatus.

(Embodiment 2)
The feature of the second embodiment of the present invention is that, instead of using the resource allocation probability, the expected throughput obtained by multiplying the resource allocation probability and the data rate is used, and the base station apparatus is selected according to the magnitude of the expected throughput. is there.

  The configuration of the mobile communication system according to the present embodiment is the same as that of the mobile communication system shown in FIG.

  FIG. 6 is a block diagram showing a main configuration of mobile station apparatus 100 according to the embodiment of the present invention. Note that in mobile station apparatus 100 of the present embodiment in FIG. 6, the same components as in FIG. 2 are assigned the same reference numerals as in FIG. The mobile station apparatus 100 shown in FIG. 6 has a configuration in which the cell selection unit 105 is deleted from the mobile station apparatus 100 shown in FIG.

  Cell selection section 501 compares the expected throughput notified from each base station apparatus, and selects the base station apparatus corresponding to the maximum expected throughput as the selected base station apparatus. Here, the expected throughput is an allocation expectation calculated by multiplying the data rate by the resource allocation probability. The data rate is determined based on the reception quality with the base station apparatus. Therefore, the expected throughput increases as the resource allocation probability increases and the data rate increases. That is, by selecting a base station apparatus having a larger expected throughput as the selected base station apparatus, a base station apparatus that can improve the throughput in the mobile station apparatus is selected. For example, when the resource allocation probabilities notified from the base station apparatus 200 and the base station apparatus 300 are the same, the mobile station apparatus 100 sets the base station apparatus having a larger expected throughput as the selected base station apparatus, There is a high possibility that the throughput in the mobile station apparatus is improved.

  FIG. 7 is a block diagram showing a main configuration of base station apparatus 200 according to the embodiment of the present invention. In addition, in base station apparatus 200 of this Embodiment of FIG. 7, the code | symbol same as FIG. 3 is attached | subjected to the same component as FIG. 3, and description is abbreviate | omitted. The base station apparatus 200 illustrated in FIG. 7 has a configuration in which the resource allocation probability acquisition unit 208 and the multiplexing unit 209 are deleted from the base station apparatus 200 illustrated in FIG. 3 and are replaced with the expected throughput acquisition unit 601 and the multiplexing unit 602. Yes.

  The expected throughput acquisition unit 601 holds an expected throughput table that employs a configuration in which CQI, data rate, resource allocation probability, and expected throughput are associated with each other. FIG. 8 shows an example of the expected throughput table. As described above, the expected throughput is obtained by multiplying the data rate by the resource allocation probability. The resource allocation probability included in the expected throughput table is calculated by the resource allocation probability calculation unit 207 as in the first embodiment. Then, when the resource allocation probability is output from the resource allocation probability calculation unit 207, the expected throughput acquisition unit 601 calculates the expected throughput and updates the expected throughput table.

  The expected throughput acquisition unit 601 acquires the expected throughput corresponding to the CQI included in the reception quality information output from the separation unit 204 from the expected throughput table. Then, the expected throughput acquisition unit 601 outputs information on the acquired expected throughput (hereinafter referred to as “expected throughput information”) to the multiplexing unit 602.

  In the expected throughput table, the expected throughput is not included in the table, and every time the expected throughput acquisition unit 601 is notified of the CQI, the expected throughput is calculated by multiplying the resource allocation probability and the data rate corresponding to the CQI. May be. Thereby, the memory for holding the expected throughput can be reduced.

  Multiplexer 602 multiplexes resource allocation information corresponding to the mobile station apparatus to which the resource is allocated, transmission data, and expected throughput information corresponding to the CQI of each mobile station apparatus (such as time multiplexing), and the obtained multiplexing The data is output to error correction coding section 210.

  Next, the base station apparatus selection operation by the mobile station apparatus 100 configured as described above will be described with reference to the sequence diagram shown in FIG. 9, the same parts as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, common pilot signals (not shown) are transmitted from base station apparatus 200 and base station apparatus 300, respectively. These common pilot signals are received via the antenna of mobile station apparatus 100, and the received common pilot signals are demodulated after being subjected to predetermined radio reception processing (down-conversion, A / D conversion, etc.). The Then, the reception quality is measured for the demodulated signal, and reception quality information including information on CQI corresponding to the reception quality measurement result is generated from the measurement result of the reception quality with each base station apparatus. . The reception quality information is subjected to predetermined radio transmission processing (D / A conversion, up-conversion, etc.) (402), and both base station apparatus 200 and base station apparatus 300, or base station apparatus 200 or base station Either one of the station devices 300 is notified. In FIG. 9, reception quality information 403 is notified to the base station apparatus 200, and reception quality information 404 is notified to the base station apparatus 300. When reception quality information 403 and reception quality information 404 are notified to only one of base station apparatus 200 or base station apparatus 300, the received base station apparatus receives reception quality information corresponding to another base station apparatus. Forward.

  Based on the reception quality information 403 and the reception quality information 404, the expected throughput information corresponding to each of the reception quality information 403 and the reception quality information 404 is acquired by the expected throughput acquisition unit 601 of the base station apparatus 200 and the base station apparatus 300, respectively. (701, 702). The obtained expected throughput information is subjected to predetermined transmission processing from the multiplexing unit 602 of the base station device 200 and the base station device 300 via the RF transmission unit 212 (407, 408), and then to the mobile station device 100. Each is notified. Alternatively, the expected throughput information is transferred to one of the base station apparatuses, and the expected throughput information is notified to the mobile station apparatus 100 from the transferred base station apparatus. In FIG. 9, expected throughput information 703 is notified from the base station apparatus 200 to the mobile station apparatus 100, and expected throughput information 704 is notified from the base station apparatus 300 to the mobile station apparatus 100. Similarly, the expected throughput information corresponding to each mobile station apparatus located in the handover area other than the mobile station apparatus 100 is notified from each base station apparatus.

  Then, the cell selection unit 501 of the mobile station apparatus 100 selects a base station apparatus corresponding to a larger expected throughput from the expected throughputs notified from the plurality of base station apparatuses (705). Note that the base station apparatus transfers each expected throughput to a control station that is a higher station, and the base station apparatus corresponding to a larger expected throughput among the expected throughputs transferred from the plurality of base station apparatuses by the control station. May be selected.

  As described above, the expected throughput increases as the resource allocation probability increases and the data rate increases. Therefore, the throughput in the mobile station apparatus can be improved by setting the base station apparatus having the maximum expected throughput as the selected base station apparatus.

  Thereafter, similarly to Embodiment 1, the selected cell information is notified to base station apparatus 200 and base station apparatus 300, and resource allocation information 418 and individual data are transmitted only from the selected base station apparatus (base station apparatus 200 in FIG. 9). Signal 420 is transmitted to mobile station apparatus 100.

  As described above, according to the present embodiment, based on the expected throughput transmitted from a plurality of base station apparatuses, the base station apparatus with the maximum expected throughput is set as the selected base station apparatus. For this reason, it is possible to improve the throughput of the mobile station apparatus by using a base station apparatus having a higher throughput as a communication partner.

  The mobile station apparatus according to the first aspect of the present invention is a mobile station apparatus that selects a base station apparatus to be a communication partner from a plurality of base station apparatuses, and the reception quality of a signal from the base station apparatus is An acquisition means for acquiring, for each of the plurality of base station apparatuses, an allocation expectation degree indicating the frequency or amount of resources actually allocated by the base station apparatus in the past with respect to an equivalent mobile station apparatus, and the acquired allocation expectation And a selection unit that selects a base station apparatus having the largest degree.

  According to this configuration, since the base station apparatus having the highest allocation expectation obtained from the past resource allocation situation is selected as the communication partner, communication is actually performed not only for the reception quality but also for the mobile station apparatus. A base station apparatus with high possibility can be selected, and the throughput in the mobile station apparatus can be improved.

  The mobile station apparatus which concerns on the 2nd aspect of this invention is a said 1st aspect. WHEREIN: The measurement means which measures the reception quality of the signal for every base station apparatus, and notifies the measured reception quality to each base station apparatus Notification means, and the acquisition means includes resource allocation probability information indicating a rate at which each base station apparatus has allocated resources within a predetermined period to a mobile station apparatus corresponding to the notified reception quality. A configuration for receiving from each base station apparatus is adopted.

  According to this configuration, since the reception quality is notified to each base station apparatus and the resource allocation probability information is received from each base station apparatus, the calculation of the resource allocation probability is performed in each base station apparatus. The processing load on the apparatus can be reduced.

  A mobile station apparatus according to a third aspect of the present invention, in the first aspect, a measuring means for measuring the reception quality of a signal for each base station apparatus, and notifies each base station apparatus of the measured reception quality. Notification means, wherein the acquisition means is a ratio of each base station apparatus allocating resources within a predetermined period to the mobile station apparatus corresponding to the notified reception quality and data corresponding to the allocated resources. A configuration is adopted in which information of expected throughput obtained by multiplying the rate is received from each base station apparatus.

  According to this configuration, since the reception quality is notified to each base station apparatus and the expected throughput information is received from each base station apparatus, the expected throughput is calculated in each base station apparatus. Processing load can be reduced. Also, not only the presence / absence of resource allocation, but also a base station device with a large expected value of the amount of data transmitted per unit time is selected, and the throughput in the mobile station device can be improved reliably.

  The mobile station apparatus according to a fourth aspect of the present invention further comprises a measuring means for measuring the reception quality of a signal for each base station apparatus in the first aspect, wherein the selection means has a predetermined reception quality. The base station apparatus that is equal to or greater than the threshold value and has the highest allocation expectation is adopted.

  According to this configuration, since a base station apparatus having a reception quality that is equal to or higher than a predetermined threshold value and the maximum expected degree of allocation is selected, a base station apparatus having a poor reception quality can be excluded from communication partners, and processing load Since the base station apparatus with poor reception quality does not allocate resources to the mobile station apparatus, useless resource allocation can be prevented.

  The base station apparatus according to the fifth aspect of the present invention includes an acquisition means for acquiring reception quality in a mobile station apparatus in a cell covered by the own apparatus, and resource allocation to the mobile station apparatus according to the acquired reception quality And means for calculating, for each reception quality, an expected allocation degree indicating the frequency or amount of resources actually allocated to the mobile station apparatus having reception quality equivalent to the acquired reception quality in the past. And a configuration having the following.

  According to this configuration, in order to calculate the allocation expectation for each reception quality from the result of past resource allocation, the mobile station apparatus is not only the magnitude of the reception quality but also the average traffic volume in the base station apparatus. A communication partner can be selected according to the considered allocation expectation, and the throughput in the mobile station apparatus can be improved.

  The base station apparatus according to a sixth aspect of the present invention, according to the fifth aspect, further comprises a transmission means for transmitting the expected allocation corresponding to the received reception quality to the mobile station apparatus corresponding to the received quality. The structure which has is taken.

  According to this configuration, since the expected allocation degree corresponding to the reception quality is transmitted to each mobile station apparatus, the mobile station apparatus only notifies the reception quality to the base station apparatus, and the expected allocation degree corresponding to this reception quality. Can be obtained.

  A control station apparatus according to a seventh aspect of the present invention is a control station apparatus that selects a base station apparatus that is a communication partner of a mobile station apparatus from a plurality of base station apparatuses, and the reception quality of a signal from the base station apparatus Acquisition means for acquiring, for each of the plurality of base station devices, an allocation expectation level indicating the frequency or amount of resources actually allocated by the base station device in the past to a mobile station device equivalent to the mobile station device; And a selection means for selecting the base station apparatus having the highest allocation expectation obtained.

  According to this configuration, since the base station apparatus having the highest allocation expectation obtained from the past resource allocation situation is selected as the communication partner, communication is actually performed not only for the reception quality but also for the mobile station apparatus. A base station apparatus with high possibility can be selected, and the throughput in the mobile station apparatus can be improved.

  A base station apparatus selection method according to an eighth aspect of the present invention is a base station apparatus selection method for selecting a base station apparatus that is a communication partner of a mobile station apparatus from a plurality of base station apparatuses, from the base station apparatus. For each of the plurality of base station devices, an allocation expectation degree indicating the frequency or amount of resources actually allocated by the base station device in the past is obtained for a mobile station device having a signal reception quality equivalent to that of the mobile station device. And a step of selecting the base station apparatus having the highest allocation expectation obtained.

  According to this method, since the base station apparatus having the highest allocation expectation obtained from the past resource allocation situation is selected as the communication partner, communication with the mobile station apparatus is actually performed, not just the reception quality. A base station apparatus with high possibility can be selected, and the throughput in the mobile station apparatus can be improved.

  The mobile station apparatus, base station apparatus, control station apparatus, and base station apparatus selection method according to the present invention can improve the throughput in the mobile station apparatus. For example, a communication scheme in which a plurality of mobile station apparatuses share resources is applied. The present invention can be applied to a mobile station apparatus, a base station apparatus, a control station apparatus, and a base station apparatus selection method in a system to be used.

The figure which shows an example of the mobile communication system which concerns on embodiment of this invention. The block diagram which shows the principal part structure of the mobile station apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a block diagram showing a main configuration of the base station apparatus according to Embodiment 1. The figure which shows an example of the resource allocation probability table which concerns on Embodiment 1. Sequence diagram showing base station apparatus selection operation by mobile station apparatus according to Embodiment 1 The block diagram which shows the principal part structure of the mobile station apparatus which concerns on Embodiment 2 of this invention. FIG. 3 is a block diagram showing a main configuration of a base station apparatus according to Embodiment 2. The figure which shows an example of the expected throughput table which concerns on Embodiment 2. Sequence diagram showing base station apparatus selection operation by mobile station apparatus according to Embodiment 2 (A) The figure which shows an example of the base station apparatus selection operation by FCS (b) The figure which shows an example of the measurement result of reception SINR

Explanation of symbols

101 RF receiver 102-1, 102-2 Demodulator 103-1, 103-2 Error correction decoder 104-1, 104-2 Separation unit 105 Cell selection unit 106-1, 106-2 Reception quality measurement unit 107- DESCRIPTION OF SYMBOLS 1, 107-2 Reception quality information generation part 108 Multiplexing part 109 Error correction encoding part 110 Modulation part 111 RF transmission part 201 RF reception part 202 Demodulation part 203 Error correction decoding part 204 Separation part 205 Selected cell determination part 206 Resource allocation part 207 Resource allocation probability calculation unit 208 Resource allocation probability acquisition unit 209 Multiplexing unit 210 Error correction coding unit 211 Modulation unit 212 RF transmission unit 501 Cell selection unit 601 Expected throughput acquisition unit 602 Multiplexing unit

Claims (8)

A mobile station device that selects a base station device to be a communication partner from a plurality of base station devices,
The plurality of base station devices indicate an allocation expectation level indicating the frequency or amount of resources actually allocated by the base station device in the past with respect to a mobile station device having a reception quality of a signal from the base station device equivalent to the own device. Acquisition means for acquiring each;
A selection means for selecting a base station apparatus having the largest allocation expectation obtained;
A mobile station apparatus comprising: Measuring means for measuring the reception quality of the signal for each base station device;
Notification means for notifying each base station device of the measured reception quality,
The acquisition means includes
The resource allocation probability information indicating the ratio of each base station apparatus allocating resources within a predetermined period to the mobile station apparatus corresponding to the notified reception quality is received from each base station apparatus. The mobile station apparatus according to 1. Measuring means for measuring the reception quality of the signal for each base station device;
Notification means for notifying each base station device of the measured reception quality,
The acquisition means includes
Information on expected throughput obtained by multiplying the mobile station apparatus corresponding to the notified reception quality by the ratio of each base station apparatus allocating resources within a predetermined period and the data rate corresponding to the allocated resources. The mobile station apparatus according to claim 1, wherein the mobile station apparatus receives the base station apparatus. Measuring means for measuring the reception quality of the signal for each base station device,
The selection means includes
2. The mobile station apparatus according to claim 1, wherein a base station apparatus having a reception quality that is equal to or higher than a predetermined threshold and has the highest allocation expectation is selected. An acquisition means for acquiring reception quality in a mobile station apparatus in a cell covered by the own apparatus;
Allocating means for allocating resources to the mobile station apparatus according to the acquired reception quality;
A calculation means for calculating, for each reception quality, an expected allocation degree indicating a frequency or an amount of resources actually allocated in the past for a mobile station apparatus having a reception quality equivalent to the acquired reception quality;
A base station apparatus comprising:   The base station apparatus according to claim 5, further comprising: a transmission unit configured to transmit an expected allocation degree corresponding to the acquired reception quality to a mobile station apparatus corresponding to the reception quality. A control station device that selects a base station device that is a communication partner of a mobile station device from a plurality of base station devices,
For a mobile station apparatus having a signal reception quality from a base station apparatus equivalent to that of the mobile station apparatus, an allocation expectation degree indicating the frequency or amount of resources actually allocated by the base station apparatus in the past is set to the plurality of base stations. Obtaining means for obtaining each of the station devices;
A selection means for selecting a base station apparatus having the largest allocation expectation obtained;
A control station apparatus comprising: A base station device selection method for selecting a base station device to be a communication partner of a mobile station device from a plurality of base station devices,
For a mobile station apparatus having a signal reception quality from a base station apparatus equivalent to that of the mobile station apparatus, an allocation expectation degree indicating the frequency or amount of resources actually allocated by the base station apparatus in the past is set to the plurality of base stations. Obtaining for each station device; and
Selecting the base station apparatus with the highest allocation expectation obtained;
A base station apparatus selection method comprising:

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