WO2009107366A1 - 基地局装置 - Google Patents
基地局装置 Download PDFInfo
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- WO2009107366A1 WO2009107366A1 PCT/JP2009/000811 JP2009000811W WO2009107366A1 WO 2009107366 A1 WO2009107366 A1 WO 2009107366A1 JP 2009000811 W JP2009000811 W JP 2009000811W WO 2009107366 A1 WO2009107366 A1 WO 2009107366A1
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- WIPO (PCT)
- Prior art keywords
- channel
- allocation
- terminal device
- allocated
- channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
Definitions
- the present invention relates to a channel allocation technique, and more particularly to a base station apparatus that allocates a channel to a terminal apparatus.
- one terminal performs communication using a plurality of channels at the same time (hereinafter referred to as multi-channel communication).
- multi-channel communication the base station searches for a time slot or a carrier that is assumed to have good communication quality without the arrival of an interference wave by monitoring the interference wave level of an incoming signal from a peripheral station. .
- the base station determines the time slot and carrier to be allocated to the terminal device according to the quality of communication requested by the terminal device from the search result.
- a base station discloses a technique for realizing optimal channel allocation according to the required quality of a terminal by keeping several channels with good quality in advance. (For example, refer to Patent Document 1). Japanese Patent Laid-Open No. 11-262044
- the communication environment may change after channel assignment. For example, when interference due to a delayed wave occurs, communication quality may deteriorate. In such a case, communication disconnection or reassignment processing occurs, which is inefficient.
- the present invention has been made in view of such a situation, and an object thereof is to provide a technique capable of efficiently allocating channels.
- a base station apparatus includes a receiving unit that receives a channel allocation request from a terminal apparatus, and frequency resources that are triggered when the receiving unit receives the request.
- a measurement unit that performs carrier sense for a channel that is defined by a combination with a resource other than a frequency, and a channel allocation unit that allocates one of the channels on which carrier sense is performed by the measurement unit to a terminal device .
- the channel allocation unit further allocates the second and subsequent channels to the same terminal device, the channel resource having the same frequency as the frequency resource is given priority over the frequency resource of the already allocated channel over other resources. Assign.
- channels can be efficiently allocated to terminals.
- FIG. 4A is a diagram illustrating a first allocation example in the channel allocation unit of FIG.
- FIG. 4B is a diagram illustrating an example of an allocation management table in the allocation example of FIG.
- FIG. 5A is a diagram illustrating a second allocation example in the channel allocation unit of FIG.
- FIG. 5B is a diagram illustrating an example of an allocation management table in the allocation example of FIG. It is a figure which shows the operation example of the base station apparatus of FIG.
- 10 reception unit 20 channel measurement unit, 40 memory, 50 channel allocation unit, 60 transmission unit, 100 base station device, 200 channel, 400 allocation channel, 500 allocation candidate channel, 600 allocation management table.
- Embodiments of the present invention relate to channel assignment techniques.
- the channel allocation technique is a technique in which a base station apparatus selects and allocates an optimal channel in response to a request from a terminal apparatus.
- the optimum channel is allocated, the communication quality is improved, so that the terminal device can perform comfortable communication. Further, since the number of retransmissions is suppressed due to the improvement in communication quality, the system resources can be used efficiently.
- the optimum channel is determined in consideration of, for example, the quality level (QoS: Quality of Service) of the communication service requested by the terminal device.
- QoS Quality of Service
- the channel to be assigned varies depending on the communication method. For example, in the TDMA (Time Division Multiple Access) method, a time slot is assigned, and in the FDMA (Frequency Division Multiple Access) method, a frequency is assigned.
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- assignable channels are defined by a combination of frequency resources and time resources. Therefore, the base station apparatus selects an available channel from a plurality of frequency bands and a plurality of time slots. However, even if communication is performed on the selected channel, communication quality may deteriorate if a delayed wave is generated. The presence or absence of a delayed wave largely depends on the positional relationship and frequency between the base station and the terminal, and therefore cannot be determined until actual communication is performed.
- the channel to be allocated is selected in consideration of the channels already allocated to the terminal apparatus. It was decided. By such an aspect, it is possible to assign an optimum channel that reduces the influence of the delayed wave.
- FIG. 1 is a diagram illustrating a configuration example of a base station apparatus 100 according to an embodiment of the present invention.
- Base station apparatus 100 includes a reception unit 10, a channel measurement unit 20, a memory 40, a channel allocation unit 50, and a transmission unit 60.
- the base station apparatus 100 should just be performed using a well-known technique about the process regarding communication with a wired network, description is abbreviate
- the receiving unit 10 receives a request signal related to channel assignment transmitted from a terminal device (hereinafter also referred to as a user).
- This request signal includes an identification number indicating the transmission source terminal device and a request for channel assignment.
- the receiving unit 10 receives a signal that has arrived from another station.
- the receiving unit 10 performs demodulation processing on the received signal and sends it to the channel measuring unit 20.
- the demodulation processing includes filter processing, error correction processing, and the like, and may be performed by a known technique.
- the channel measurement unit 20 performs carrier sense on a signal arriving from another station.
- Carrier sense is implemented by measuring the level of interference waves for each channel to be selected.
- FIG. 2 is a diagram illustrating an example of a plurality of channels 200 to be selected in the channel measurement unit 20 of FIG.
- the horizontal axis represents time slots and the vertical axis represents frequency.
- FIG. 2 shows a channel for one frame.
- Each frame has the same channel structure. That is, base station apparatus 100 assigns the same channel to be used in each frame, and thereafter, the same channel is repeatedly used in each frame. For example, it is assumed that the sixth channel 260 in FIG. In this case, the terminal device X uses the sixth channel 260 regardless of the frame.
- the channel measurement unit 20 measures the interference wave level for each channel 200 of the first channel 210 to the sixteenth channel 360 shown in FIG. 2, and stores the comparison result with the threshold value in the memory 40. Details will be described later.
- the memory 40 stores a comparison result between the interference wave level measured by the channel measuring unit 20 and a threshold value. Further, the memory 40 stores in the assignment management table 600 information related to the assigned users for each channel measuring unit 20 selected by the channel measuring unit 20.
- the channel allocation unit 50 accesses the memory 40, refers to the allocation management table 600, and allocates a channel to a terminal device that requests channel allocation. In addition, the channel assignment unit 50 stores the assignment result in the memory 40. Details will be described later. Further, the channel allocation unit 50 includes information on the allocated channel in the transmission signal to the corresponding user. The transmission unit 60 transmits a transmission signal including information on the allocated channel to the corresponding user.
- FIG. 3 is a diagram showing an example of an allocation management table 600 stored in the memory 40 of FIG.
- the allocation management table 600 includes a channel column 610, a user ID column 620, an allocation order column 630, and a level determination column 640.
- the channel column 610 includes an identifier indicating the channel 200 shown in FIG.
- the user ID column 620 includes an identifier related to the terminal device to which the channel 200 shown in the channel column 610 is assigned.
- the allocation order column 630 includes a number (hereinafter referred to as an allocation order) indicating what number the channel 200 is assigned to when one or more channels 200 are assigned to the same terminal device.
- user C is assigned to the first channel 210
- user B is assigned to the second channel 220 and the third channel 230
- user A is assigned to the tenth channel 300.
- no user is assigned to the sixteenth channel 360.
- the second channel 220 is the channel 200 assigned to the user B for the first time
- the third channel 230 is the channel 200 assigned to the user B for the second time. Has been.
- the level determination column 640 is a column indicating a comparison result between the interference wave level and a predetermined threshold value.
- “ ⁇ ” is indicated in the level determination column 640.
- “x” is indicated in the allocation management table 600 of FIG. 3
- the interference wave levels of the first channel 210, the second channel 220, the third channel 230, and the tenth channel 300 are smaller than the threshold value, and the interference wave level of the sixteenth channel 360 is It is shown that it is above the threshold.
- the channel measurement unit 20 performs carrier sense for each channel 200 shown in FIG. 2 when the reception unit 10 receives the request. As shown in FIG. 3, the channel measurement unit 20 stores the comparison result with a predetermined threshold value in the level determination column 640 of the allocation management table 600 of the memory 40 for each channel 200 as shown in FIG. .
- the channel allocation unit 50 allocates any channel 200 to the terminal device in consideration of the interference wave level for each channel 200 stored in the memory 40. Further, the channel allocation unit 50 stores the correspondence between the allocated channel 200 and the terminal device in the channel column 610 and the user ID column 620 of the allocation management table 600.
- the channel allocation unit 50 first refers to the allocation management table 600 stored in the memory 40 to check whether or not the channel 200 has already been allocated to the terminal device that has requested allocation. . When there is no terminal device that has requested allocation in the user ID column 620 of the allocation management table 600, the channel allocation unit 50 allocates to other terminal devices among the plurality of channels 200 measured by the channel measurement unit 20. A channel 200 that is not yet available and has the best quality is allocated to the terminal device.
- the quality is judged to be better as the interference wave level is lower. In the determination, it may be compared with a predetermined threshold value.
- the channel 200 having an interference wave level smaller than the threshold value may be selected as an assignable channel.
- the threshold value may be determined according to the QoS required by the terminal device.
- a channel 200 that is not assigned to another terminal apparatus and that has an interference wave level smaller than a threshold value is referred to as an “assignable channel”.
- the channel allocation unit 50 considers the channel 200 allocated to the terminal device in the past and sets two Selects all subsequent assignable channels. Specifically, the channel allocation unit 50 refers to the allocation management table 600 and confirms the channel 200 allocated in the past. Then, a channel 200 having the same frequency as that of the channel 200 is searched.
- the second channel when the channel 200 allocated in the past is used as a reference is as follows.
- the channel existing in the frequency direction, not the time direction, is selected with priority.
- the channel allocation unit 50 selects a channel 200 having a low interference wave level among them (hereinafter referred to as allocation selection processing).
- the channel allocation unit 50 refers to the allocation order column 630 of the allocation management table 600 for the terminal device. Then, the channel allocation unit 50 preferentially allocates the channel 200 having the same frequency as the frequency applied to the channel 200 allocated most recently. When there is no channel 200 having the same frequency as the frequency applied to the channel 200 allocated most recently, the channel 200 allocated in the previous stage may be considered. Alternatively, a channel 200 having the same frequency as that of the channel 200 assigned first may be assigned.
- FIG. 4A is a diagram illustrating a first allocation example in the channel allocation unit 50 of FIG.
- the channel allocation unit 50 first searches for the ninth channel 290, the eleventh channel 310, and the twelfth channel 320 having the same frequency as that of the already allocated tenth channel 300, and sets it as the allocation candidate channel 500. select.
- the channel allocation unit 50 determines a channel that can be allocated to the terminal device A according to the allocation selection process among the three allocation candidate channels 500.
- FIG. 4B is a diagram illustrating an example of the allocation management table 600 in the allocation example of FIG.
- the eleventh channel 310 is already assigned to another terminal device B.
- the twelfth channel 320 has an interference wave level higher than a predetermined threshold value. Therefore, in the state as shown in FIG. 4B, the assignable channel is only the ninth channel 290.
- the channel allocation unit 50 selects the ninth channel 290 as the channel 200 to be allocated to the terminal device A. When there are a plurality of assignable channels 200, the channel assignment unit 50 selects an assignable channel according to the assignment selection process.
- FIG. 5A is a diagram illustrating a second allocation example in the channel allocation unit 50 of FIG.
- FIG. 5B is a diagram illustrating an example of the allocation management table 600 in the allocation example of FIG. In this example, it is assumed that there is a further allocation request from the terminal device A to which the two channels 200 of the tenth channel 300 and the seventh channel 270 are already allocated.
- the tenth channel 300 is assigned first, and then the seventh channel 270 is assigned.
- the channel allocated most recently is preferentially considered. This is because the most recently assigned channel is considered to be highly reliable because it has less time passage.
- the channel allocation unit 50 searches for the channel 200 having the same frequency as the seventh channel 270 allocated more recently, and sets the fifth channel 250, the sixth channel 260, and the seventh channel 270 to the second channel 270.
- the candidate channel 520 is selected.
- the channel allocation unit 50 determines whether the 10th channel 300 allocated immediately before the allocation of the seventh channel 270 can be allocated.
- the first allocation candidate channels 510 having the same frequency as the tenth channel 300 are the ninth channel 290, the eleventh channel 310, and the twelfth channel 320.
- the assignable channels are the eleventh channel 310 and the twelfth channel 320.
- the channel allocation unit 50 selects a channel 200 to be allocated to the terminal device A according to the above-described allocation selection process.
- the channel allocation unit 50 does not consider the past allocation and the first channel 210 to the sixteenth channel 360.
- An allocatable channel may be selected from the list.
- FIG. 6 is a diagram illustrating an operation example of the base station apparatus 100 of FIG.
- the channel measurement unit 20 performs carrier sense on a signal arriving from another station, and measures the interference wave level for each channel 200 to be allocated (S10).
- the channel allocating unit 50 accesses the memory 40 to check whether or not there is an already allocated channel for the terminal device (S12). ).
- the channel allocation unit 50 allocates a channel that is not used by another terminal device and has the lowest interference level (S16). On the other hand, when there is an already allocated channel (Y in S12), the channel allocation unit 50 allocates among the channels allocated in the past, specifically, among channels having the same frequency as the channel allocated more recently. One possible channel is selected (S18).
- the channel allocation unit 50 allocates the selected channel to the terminal device (S22).
- the channel allocation unit 50 performs the allocation process in S16 regardless of whether the channel has been allocated in the past.
- the second and subsequent channels are further allocated to the same terminal device, it is possible to allocate channels of higher quality by executing the allocation process in consideration of the already allocated channels. Further, by assigning a channel having the same frequency as that applied to a channel assigned in the past, it is possible to assign a channel in which a delayed wave is hardly generated.
- the third and subsequent channels are further allocated to the same terminal device, a channel having the same frequency as the frequency assigned to the most recently allocated channel is allocated more reliably, so that a high-quality channel can be obtained. Can be assigned.
- the channel having the same frequency as the frequency assigned to the channel initially allocated to the terminal device can be stably allocated. A good channel can be selected.
- the channel measurement unit 20 has been described as performing carrier sense for all channels 200.
- carrier sense may be executed only for the channel 200 having the same frequency as the channel 200 allocated in the past. With such an aspect, the processing burden can be reduced.
- the multi-carrier TDMA scheme in which the channel is defined by the combination of the frequency resource and the time resource has been described.
- the present invention is not limited to this, and the frequency resource and the resource other than the frequency resource are described.
- a method based on a combination thereof may be used.
- the present invention can be applied to a scheme in which a channel is defined by a combination of frequency resources and spatial resources, and a scheme in which a channel is defined by a combination of frequency resources and code resources.
- channels can be efficiently allocated to terminals.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
Description
Claims (3)
- チャネルの割当の要求を端末装置から受信する受信部と、
前記受信部において要求が受信されたことを契機として、周波数リソースと、周波数以外のリソースとの組み合わせにより規定されるチャネルを対象として、キャリアセンスを実行する測定部と、
前記測定部によってキャリアセンスが実行されたチャネルのいずれかを前記端末装置に対して割り当てるチャネル割当部と、
を備え、
前記チャネル割当部は、同一の端末装置に対して2つ目以降のチャネルをさらに割り当てる場合、すでに割り当てたチャネルの周波数リソースを他のリソースよりも優先して、その周波数リソースと同一の周波数を有するチャネルを割り当てることを特徴とする基地局装置。 - 前記チャネル割当部は、同一の端末装置に対して3つ目以降のチャネルをさらに割り当てる場合、当該端末装置に対してより直近において割り当てたチャネルにかかる周波数リソースと同一の周波数を有するチャネルを割り当てることを特徴とする請求項1に記載の基地局装置。
- 前記チャネル割当部は、同一の端末装置に対して3つ目以降のチャネルをさらに割り当てる場合、当該端末装置に対して最初に割り当てたチャネルにかかる周波数リソースと同一の周波数を有するチャネルを割り当てることを特徴とする請求項1に記載の基地局装置。
Priority Applications (2)
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CN2009801047498A CN101940048A (zh) | 2008-02-29 | 2009-02-24 | 基站装置 |
US12/920,076 US20110044194A1 (en) | 2008-02-29 | 2009-02-24 | Base station apparatus |
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JP2008-050594 | 2008-02-29 | ||
JP2008050594A JP5011161B2 (ja) | 2008-02-29 | 2008-02-29 | 基地局装置 |
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WO2009107366A1 true WO2009107366A1 (ja) | 2009-09-03 |
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PCT/JP2009/000811 WO2009107366A1 (ja) | 2008-02-29 | 2009-02-24 | 基地局装置 |
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US (1) | US20110044194A1 (ja) |
JP (1) | JP5011161B2 (ja) |
KR (1) | KR20100110878A (ja) |
CN (1) | CN101940048A (ja) |
WO (1) | WO2009107366A1 (ja) |
Citations (4)
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JPH06204943A (ja) * | 1993-01-06 | 1994-07-22 | Toshiba Corp | 無線通信システム |
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JP2002152813A (ja) * | 2000-11-09 | 2002-05-24 | Ntt Docomo Inc | 移動通信システムにおけるタイムスロット割り当て方法および移動通信システムにおけるタイムスロット割り当て装置 |
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- 2008-02-29 JP JP2008050594A patent/JP5011161B2/ja not_active Expired - Fee Related
-
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- 2009-02-24 CN CN2009801047498A patent/CN101940048A/zh active Pending
- 2009-02-24 US US12/920,076 patent/US20110044194A1/en not_active Abandoned
- 2009-02-24 KR KR1020107018655A patent/KR20100110878A/ko not_active Application Discontinuation
- 2009-02-24 WO PCT/JP2009/000811 patent/WO2009107366A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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JP5011161B2 (ja) | 2012-08-29 |
KR20100110878A (ko) | 2010-10-13 |
CN101940048A (zh) | 2011-01-05 |
US20110044194A1 (en) | 2011-02-24 |
JP2009212564A (ja) | 2009-09-17 |
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