JP6091227B2 - Communication system, communication method, and communication device - Google Patents

Communication system, communication method, and communication device Download PDF

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JP6091227B2
JP6091227B2 JP2013014757A JP2013014757A JP6091227B2 JP 6091227 B2 JP6091227 B2 JP 6091227B2 JP 2013014757 A JP2013014757 A JP 2013014757A JP 2013014757 A JP2013014757 A JP 2013014757A JP 6091227 B2 JP6091227 B2 JP 6091227B2
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communication device
carrier
communication
part
frequency band
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JP2014146991A (en
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徹 佐原
徹 佐原
飯沼 敏範
敏範 飯沼
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京セラ株式会社
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  The present invention relates to a communication system, a communication method, and a communication apparatus.

  For example, in a TD-LTE communication method, a carrier wave used for transmission can have a frequency bandwidth (hereinafter referred to as a bandwidth) of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, and 20 MHz (non-bandwidth). Patent Documents 1 and 2). The number of resource blocks (RB) included in each bandwidth is 6 RB, 15 RB, 25 RB, 50 RB, and 100 RB, respectively, and the communication speed increases as the bandwidth increases. However, since it is not possible to share the frequency band allocated for other current communication methods (digital cordless telephone etc.), an appropriate bandwidth is set within the range of the available frequency band.

  An area having a bandwidth of 9 MHz (hereinafter referred to as 9 MHz band or second frequency band) from 1884.5 MHz to 1893.5 MHz is allocated as the frequency band of the public PHS. For example, when a TD-LTE communication method is used in the 9 MHz band, the carrier bandwidth is set to 5 MHz (hereinafter also referred to as a first frequency bandwidth) so as to be within the bandwidth of 9 MHz, and one carrier is arranged. Conceivable. However, if the bandwidth is 5 MHz, the communication speed will be lower than when the bandwidth is 10 MHz. Moreover, since only the bandwidth of 9 MHz, which is the bandwidth, is used for communication, the use efficiency of communication resources is deteriorated.

  On the other hand, if two 5 MHz carriers are continuously arranged in the 9 HMz band, the bandwidth exceeds 9 MHz, and it protrudes into the band of another adjacent system (digital cordless telephone band). More specifically, although the effective band occupied when two carriers of 5 MHz (effective band is 4.5 MHz) are continuously arranged is 9 MHz, the leaked power protrudes into the frequency band of the digital cordless telephone, Radio interference will occur.

  Accordingly, an object of the present invention made in view of the above-described problems is to secure a carrier bandwidth in a communication system such as TD-LTE so as to increase communication speed and to be assigned to the communication system. Another object of the present invention is to provide a communication system, a communication method, and a communication apparatus that can prevent a radio wave interference with another system by placing a carrier in a frequency band (for example, 9 MHz band).

In order to solve the above problems, a communication system according to the present invention provides:
A plurality of communications in which wireless communication is performed by arranging a plurality of the carriers in the second frequency band that exceeds the bandwidth of the second frequency band defined in advance when the carriers of the first frequency bandwidth are continuously arranged. A communication system comprising an apparatus,
In the second frequency band, the communication system is configured such that a part of each carrier is overlapped and the first communication apparatus uses one of the carriers that is overlapped and the other carrier. And a second communication device that uses the wireless communication device, a portion that is preferentially used by each communication device among the overlapping portions is divided in units of radio resources divided by frequency and time ,
The first communication device and the second communication device receive only control data from a radio terminal at the same timing by preferentially using the radio resource divided in the overlapping portion .

Moreover, the communication system according to the present invention includes:
The first communication device and the second communication device receive data from the wireless terminal at a first timing, and the first communication device and the second communication device receive data from the wireless terminal at a second timing. Send
In the second frequency band, when a part of each carrier is overlapped and arranged, a rule that determines a portion used by the first communication device and the second communication device is defined as the first timing and the second timing. And different in advance,
In the first timing, in the second frequency band, a part of each carrier is arranged to be overlapped, one of the carriers arranged to be partly overlapped is used by the first communication apparatus, and the other Each communication device receives only control data by dividing a portion that each communication device preferentially uses so that the second communication device uses the second carrier,
In the second timing, in the second frequency band, a part of each carrier is arranged so as to overlap, and the first communication apparatus or the first using one carrier arranged so that the part overlaps is used. The communication apparatus 2 does not use an overlapping part included in the carrier.

Moreover, the communication system according to the present invention includes:
An effective band for transmitting and receiving a radio signal in the first frequency bandwidth is 4.5 MHz, a bandwidth of the second frequency band is 9 MHz, and a bandwidth of the overlapping portion is 0.9 MHz. To do.

Moreover, the communication system according to the present invention includes:
The overlapping part has 10 slots, the first communication device uses a high-frequency part of the overlapping part as a preferential area, and the second communication device has a low frequency in the overlapping part. It is characterized in that the area is used preferentially.

Further, the communication method according to the present invention includes:
A plurality of communications in which wireless communication is performed by arranging a plurality of the carriers in the second frequency band that exceeds the bandwidth of the second frequency band defined in advance when the carriers of the first frequency bandwidth are continuously arranged. A communication method comprising an apparatus,
In the second frequency band, a part of each carrier is arranged in an overlapping manner, a first communication device that uses one of the carriers arranged in a part of the overlapping part, and a second that uses the other carrier And the communication device of each of the overlapping portions is divided into radio resource units divided by frequency and time, the portion that each communication device uses preferentially ,
The first communication device and the second communication device receive only control data from a radio terminal at the same timing by preferentially using the radio resource divided in the overlapping portion .

Further, the communication method according to the present invention includes:
The first communication device and the second communication device receive data from the wireless terminal at a first timing, and the first communication device and the second communication device receive data from the wireless terminal at a second timing. Send
In the second frequency band, when a part of each carrier is overlapped and arranged, a rule that determines a portion used by the first communication device and the second communication device is defined as the first timing and the second timing. And different in advance,
In the first timing, in the second frequency band, a part of each carrier is arranged to be overlapped, one of the carriers arranged to be partly overlapped is used by the first communication apparatus, and the other Each communication device receives only control data by dividing a portion that each communication device preferentially uses so that the second communication device uses the second carrier,
In the second timing, in the second frequency band, a part of each carrier is arranged so as to overlap, and the first communication apparatus or the first using one carrier arranged so that the part overlaps is used. The communication apparatus 2 does not use an overlapping part included in the carrier.

Further, the communication method according to the present invention includes:
An effective band for transmitting and receiving a radio signal in the first frequency bandwidth is 4.5 MHz, a bandwidth of the second frequency band is 9 MHz, and a bandwidth of the overlapping portion is 0.9 MHz. To do.

Further, the communication method according to the present invention includes:
The overlapping part has 10 slots, the first communication device uses a high-frequency part of the overlapping part as a preferential area, and the second communication device has a low frequency in the overlapping part. It is characterized in that the area is used preferentially.

The communication device according to the present invention is
A plurality of communications in which wireless communication is performed by arranging a plurality of the carriers in the second frequency band that exceeds the bandwidth of the second frequency band defined in advance when the carriers of the first frequency bandwidth are continuously arranged. A first communication device in a communication system comprising the device,
In the second frequency band, a part of each carrier is arranged in an overlapping manner, one of the carriers in which the part is arranged in an overlapping manner is used, and the second communication apparatus uses the other carrier,
In the overlapping part, the part that each communication device uses preferentially is divided in units of radio resources divided by frequency and time ,
The first communication device and the second communication device receive only control data from a radio terminal at the same timing by preferentially using the radio resource divided in the overlapping portion .

The communication device according to the present invention is
The first communication device and the second communication device receive data from the wireless terminal at a first timing, and the first communication device and the second communication device receive data from the wireless terminal at a second timing. Send
In the second frequency band, when a part of each carrier is overlapped and arranged, a rule that determines a portion used by the first communication device and the second communication device is defined as the first timing and the second timing. And different in advance,
In the first timing, in the second frequency band, a part of each carrier is arranged to be overlapped, one of the carriers arranged to be partly overlapped is used by the first communication apparatus, and the other Each communication device receives only control data by dividing a portion that each communication device preferentially uses so that the second communication device uses the second carrier,
In the second timing, in the second frequency band, a part of each carrier is arranged so as to overlap, and the first communication apparatus or the first using one carrier arranged so that the part overlaps is used. The communication apparatus 2 does not use an overlapping part included in the carrier.

The communication device according to the present invention is
An effective band for transmitting and receiving a radio signal in the first frequency bandwidth is 4.5 MHz, a bandwidth of the second frequency band is 9 MHz, and a bandwidth of the overlapping portion is 0.9 MHz. To do.

The communication device according to the present invention is
The overlapping portion has 10 slots, and a portion of the overlapping portion that is used preferentially is a high frequency region or a low frequency region.

  According to the communication system, communication method, and communication apparatus of the present invention, in a communication system such as TD-LTE, the carrier bandwidth is ensured to increase the communication speed, and the frequency band assigned to the communication system It is possible to prevent radio wave interference with other systems by placing the carrier inside (for example, 9 MHz band).

1 is a schematic diagram of a communication system according to an embodiment of the present invention. It is a block diagram of the base station which concerns on one Embodiment of this invention. It is a block diagram of the mobile station which concerns on one Embodiment of this invention. It is an arrangement | positioning schematic diagram of the carrier which concerns on one Embodiment of this invention. FIG. 3 is a layout diagram of carriers in a downlink according to an embodiment of the present invention. FIG. 4 is a layout diagram of carriers in an uplink according to an embodiment of the present invention. It is a flowchart which shows operation | movement of the communication system which concerns on one Embodiment of this invention.

  Embodiments of the present invention will be described below.

(Embodiment)
FIG. 1 is a schematic diagram of a communication system 1 according to an embodiment of the present invention. A communication system 1 according to an embodiment of the present invention includes a plurality of communication devices. For example, as shown in FIG. 1, the communication system 1 includes a communication device 10a (base station 10a) and a communication device 10b (base station 10b), each of which includes a communication device 11a (mobile station 11a) and a communication device 11b (mobile station 11b). ) Is connected. Although FIG. 1 shows an example in which two base stations and two mobile stations are provided, the present invention is not limited to this, and there may be two or more base stations and mobile stations.

  The communication system 1 is a system that employs a communication method such as TD-LTE or LTE. Hereinafter, in the present embodiment, the communication system 1 will be described assuming that a TD-LTE communication method is employed. The communication system 1 performs wireless communication by arranging two carriers having a bandwidth (first frequency bandwidth) of 5 MHz (effective bandwidth is 4.5 MHz) in the 9 MHz band (second frequency band). Hereinafter, the two carriers arranged in the second frequency band are referred to as carrier A and carrier B. For example, the base station 10a and the communication device 11a communicate using the carrier A, and the base station 10b and the communication device 11b communicate using the carrier B.

  2A and 2B are block diagrams of the base station 10a and the base station 10b, respectively, according to an embodiment of the present invention. As shown in FIG. 2A, the base station 10a includes a base station communication unit 101a, a base station baseband unit 102a, and a base station control unit 103a. The base station communication unit 101a and the base station baseband unit 102a are connected to the base station control unit 103a.

  The base station communication unit 101a transmits and receives radio signals (data) to and from the mobile station 11a via an antenna. The base station communication unit 101a performs amplification and down-conversion with low noise on the received radio signal (reception signal), and sends the processed signal to the base station baseband unit 102a. Further, the base station communication unit 101a performs up-conversion and amplification on the baseband signal received from the base station baseband unit 102a, and generates a radio signal (transmission signal). Then, the base station communication unit 101a transmits the radio signal to the mobile station 11a via the antenna.

  The base station baseband unit 102a demodulates the received signal by performing AD conversion, fast Fourier transform, and the like on the signal received from the base station communication unit 101a, and extracts the baseband signal. Then, the base station baseband unit 102a sends a baseband signal to the base station control unit 103a. The base station baseband unit 102a modulates the baseband signal by performing inverse fast Fourier transform, DA conversion, and the like on the baseband signal generated by the base station control unit 103a. Then, the modulated baseband signal is sent to the base station communication unit 101a.

  The base station control unit 103a controls and manages the entire base station 10a including each functional block of the base station 10a. The base station control unit 103a is configured as software executed on any suitable processor such as a CPU (central processing unit), or by a dedicated processor (for example, DSP (digital signal processor)) specialized for each process. It can also be configured.

  The base station control unit 103a uses the carrier A having the first frequency bandwidth in order to realize wireless communication between the base station 10a and the mobile station 11a. Specifically, the base station control unit 103a allocates used downlink radio resources and used uplink radio resources, which are part of the carrier A, to the mobile station 11a (and other mobile stations connected to the base station 10a). The used downlink radio resource is a radio resource that the base station uses in downlink communication (downlink) with the mobile station. The used uplink radio resource is a radio resource used by the mobile station in uplink communication (uplink) with the base station. Then, the base station control unit 103a communicates with the mobile station 11a using the allocated use downlink radio resource and use uplink radio resource. In addition, the base station control unit 103a transmits the information on the assigned downlink radio resources and uplink uplink radio resources to the mobile station 11a (and other mobile stations connected to the base station 10a) via the base station communication unit 101a. Send.

  As shown in FIG. 2B, the base station 10b has the same configuration as the base station 10a. The base station communication unit 101b and the base station baseband unit 102b perform the same operations as the base station communication unit 101a and the base station baseband unit 102a, respectively.

  The base station control unit 103b of the base station 10b uses the carrier B having the first frequency bandwidth in order to realize wireless communication between the base station 10b and the mobile station 11b. Specifically, the base station control unit 103b allocates the used downlink radio resources and the used uplink radio resources that are part of the carrier B to the mobile station 11b (and other mobile stations connected to the base station 10b). Then, the base station control unit 103b communicates with the mobile station 11b using the allocated use downlink radio resource and use uplink radio resource. In addition, the base station control unit 103b sends the information on the assigned downlink radio resources and uplink uplink radio resources to the mobile station 11b (and other mobile stations connected to the base station 10b) via the base station communication unit 101b. Send.

  FIGS. 3A and 3B are block diagrams of the mobile station 11a and the mobile station 11b, respectively, according to an embodiment of the present invention. As shown in FIG. 3A, the mobile station 11a includes a mobile station communication unit 111a, a mobile station baseband unit 112a, and a mobile station control unit 113a. The mobile station communication unit 111a and the mobile station baseband unit 112a are connected to the mobile station control unit 113a.

  The mobile station communication unit 111a transmits and receives radio signals (data) to and from the base station 10a via an antenna. The mobile station communication unit 111a performs amplification and down-conversion with low noise on the received radio signal (reception signal), and sends the processed signal to the mobile station baseband unit 112a. In addition, the mobile station communication unit 111a performs up-conversion and amplification on the baseband signal received from the mobile station baseband unit 112a to generate a radio signal (transmission signal). Then, the mobile station communication unit 111a transmits the radio signal to the base station 10a via the antenna.

  The mobile station baseband unit 112a demodulates the received signal by performing AD conversion, fast Fourier transform, and the like on the signal received from the mobile station communication unit 111a, and extracts the baseband signal. Then, the mobile station baseband unit 112a sends a baseband signal to the mobile station control unit 113a. The mobile station baseband unit 112a modulates the baseband signal by performing inverse fast Fourier transform, DA conversion, and the like on the baseband signal generated by the mobile station control unit 113a. The modulated baseband signal is sent to the mobile station communication unit 111a.

  The mobile station control unit 113a controls and manages the entire mobile station 11a including each functional block of the mobile station 11a. The mobile station control unit 113a is configured as software executed on an arbitrary suitable processor such as a CPU (Central Processing Unit), or by a dedicated processor (for example, DSP (Digital Signal Processor)) specialized for each process. It can also be configured.

  The mobile station control unit 113a determines the radio resource to be used based on the allocation information of the used downlink radio resource and the used uplink radio resource in the carrier A received from the base station 10a. Then, the mobile station control unit 113a performs radio communication with the base station 10a by the mobile station communication unit 111a and the mobile station baseband unit 112a using the determined radio resource.

  As shown in FIG. 3B, the mobile station 11b has the same configuration as the mobile station 11a. The mobile station communication unit 111b and the mobile station baseband unit 112b perform the same operations as the mobile station communication unit 111a and the mobile station baseband unit 112a, respectively.

  The mobile station control unit 113b of the mobile station 11b determines the radio resource to be used based on the information on the used downlink radio resource and the used uplink radio resource in the carrier B received from the base station 10b. Then, the mobile station control unit 113b performs radio communication with the base station 10b by the mobile station communication unit 111b and the mobile station baseband unit 112b using the determined radio resource.

  Here, when the carrier A and the carrier B having the first frequency bandwidth (5 MHz) are continuously arranged in the second frequency band (9 MHz band), the total becomes 10 MHz and exceeds 9 MHz. Therefore, the communication system 1 according to an embodiment of the present invention arranges a part of the bands of the carrier A and the carrier B so as to overlap (overlap) in the 9 MHz band. FIG. 4 shows a schematic diagram in which a part of the carrier A and the carrier B are overlapped. As shown in FIG. 4, as a peripheral band of the 9 MHz band, a 1.7G mobile phone band, a guard band band, a public PHS band (9 MHz band), a digital cordless telephone band, a public PHS band, a guard band band, and a 2G mobile phone Bandwidth is less than 1879.9 MHz, 1879.9 MHz to 1884.5 MHz, 1884.5 MHz to 1893.5 MHz, 1893.5 MHz to 1906.1 MHz, 1906.1 to 1915.7 MHz, 1915.7 MHz to 1920 MHz, 1920 MHz or more, respectively. Assigned. As shown in FIG. 4, in the communication system 1, the carrier A and the carrier B are partially overlapped and arranged in the 9 MHz band. Specifically, since the center frequency of the carrier is assigned in units of 0.1 MHz based on the LTE standard (Non-Patent Document 1), most of the frequency band of carrier A is between 1884.5 MHz and 1889.5 MHz. And most of the frequency band of the carrier B is arranged between 1888.5 and 1893.5 MHz. The carrier A and the carrier B are overlapped in a 1 MHz portion between 1888.5 MHz and 1889.5 MHz, for example. Hereinafter, the overlapping part is referred to as an overlapping part (or overlap band).

  FIG. 5 is a schematic diagram showing a use area of radio resources of each carrier in the downlink. As an outline, the base station 10a and the mobile station 11a that use the carrier A do not use the overlapping portion included in the carrier A. Specifically, as shown in FIG. 5 (a), the base station control unit 103a of the base station 10a corresponds to 5 MHz of the entire carrier A, that is, an effective band of 4.5 MHz that is a frequency band for actually transmitting and receiving radio signals. Of the 25 RB region 501a, the 3.6 MHz (20 RB) region 502a is allocated for communication with a mobile station (for example, the mobile station 11a) connected to the base station 10a. The remaining 0.9 MHz (5 RB) region 503a, that is, the overlapping portion (overlap band) is not allocated for communication with the mobile station connected to the base station 10a. In addition, the bandwidth (Downlink Bandwidth Configuration) in the downlink may be changed in the LTE standard (Non-patent Document 2), and satisfies the provisions defined in the LTE standard without using overlapping portions. .

  On the other hand, the base station 10b using the carrier B uses the overlapping portion included in the carrier B. Specifically, as shown in FIG. 5 (b), the base station control unit 103b of the base station 10b connects to the base station 10b a region 501b of 25RB corresponding to 5 MHz of the entire carrier B, that is, an effective bandwidth of 4.5 MHz. Assigned for communication with the mobile station. As shown in FIG. 5C, the region 502b (0.9 MHz, 5RB) of the region 501b overlaps with the region 503a and is arranged in the second frequency band, and the region 503b (3.6 MHz, 20RB) is a carrier. Arranged so as not to overlap with A.

  In this way, in the downlink, the base station 10a using one carrier A arranged with overlapping overlap bands does not use the overlapping portion (overlap band) included in the carrier A, and the other carrier. Since the base station 10b that uses B uses the overlapping portion included in the carrier B, interference in the overlapping portion can be prevented. In this way, in the downlink, the carrier bandwidth is secured to speed up communication, and the carrier is placed in the 9 MHz band assigned to the communication method to prevent radio interference with other systems. To do.

  FIG. 6 is a schematic diagram showing a use area of radio resources of each carrier in the uplink. As a general rule, the base station 10a and the mobile station 11a that use the carrier A, and the base station 10b and the mobile station 11b that use the carrier B partition the part used by each base station in the overlapping part (overlap band). Then, the base station 10a and the mobile station 11a, and the base station 10b and the mobile station 11b perform radio communication using radio resources in the divided areas.

  The base station control unit 103a of the base station 10a allocates 15RBs in the region 601a for the carrier A to PUSCH (Physical Uplink Shared Channel (uplink shared channel)). In addition, the base station control unit 103a allocates a part of each 5RB of the area 602a and the area 603a for PUCCH (Physical Uplink Control Channel (uplink control channel)), that is, a channel for communicating control data. The allocation of the PUSCH and PUCCH is based on the TD-LTE specification (Non-Patent Document 2). Here, the base station control unit 103a uses, for the PUCCH, the second half slot (the area 612a in FIG. 6A) of the RB having the first to second lowest frequency and the RB having the third lowest frequency in the area 602a. Assign. The latter half slot is a slot in the time domain of 0.5 ms in the latter half of 1 RB (2 slots). Further, the base station control unit 103a allocates the first half slot of the RB having the third lowest frequency and the 2RB having the fourth to fifth lowest frequency (region 613a in FIG. 6A) for the PUCCH in the region 603a. The first half slot is a slot in the time domain of 0.5 ms in the first half of 1 RB (2 slots).

  In addition, the base station control unit 103b of the base station 10b allocates 15RBs in the region 601b of the carrier B for PUSCH. In addition, the base station control unit 103b allocates a part of each 5RB of the area 602b and the area 603b for PUCCH. Here, the base station control unit 103b uses, for the PUCCH, the 2nd lowest frequency 2RB in the area 602b and the second half of the next lowest RB (area 612b in FIG. 6B) for the PUCCH. Assign. In addition, the base station control unit 103b allocates the first half slot of the RB having the third lowest frequency and the 2RB having the fourth to fifth lowest frequency (region 613b in FIG. 6B) for the PUCCH in the region 603b.

  In this way, the base station 10a and the base station 10b divide the radio resources to be used among the carriers, so that as shown in FIG. 6C, the frequency is 1 among the 5 RBs (10 slots) which are overlapping portions. The base station 10b uses the second lowest RB and the second half (total of 5 slots) of the third lowest RB, and the rest (the first half of the third lowest RB and the fourth and fifth lowest RB). ) (Total of 5 slots) is used by the base station 10a. In this way, in the uplink, the carrier bandwidth is secured to increase the communication speed, and the 9 MHz band assigned to the communication method is accommodated to prevent radio wave interference with other systems.

  In the above, the base station 10a and the mobile station 11a that use the carrier A and the base station 10b and the mobile station 11b that use the carrier B strictly categorize the part used by each base station among the overlapping parts. However, the overlapped portion may be classified as a portion that is preferentially used by each base station. That is, the base station 10b and the mobile station 11b may use the part used preferentially among the carrier A and the carrier B, respectively, or may use radio resources other than the part. In this case, radio resources used by the base station 10b and the mobile station 11b may overlap. However, in uplink communication, since there is orthogonal spatial multiplexing, it is possible to determine in a certain range which carrier the base station 10a or the base station 10b belongs to. Therefore, even if the carrier A and the carrier B use radio resources of the same frequency and the same time domain, radio wave interference does not occur within a certain range.

  Next, the operation of the communication system 1 according to the embodiment of the present invention will be described with reference to the flowchart shown in FIG.

  Fig.7 (a) shows operation | movement of the base station 10a and the mobile station 11a of the communication system 1 which concerns on one Embodiment of this invention.

  First, the base station control unit 103a allocates the used downlink radio resources and the used uplink radio resources, which are part of the carrier A, to the mobile station 11a (and other mobile stations connected to the base station 10a) (step S101a). .

  At this time, in the downlink, the base station control unit 103a communicates with the mobile station that connects the region 502a of 3.6 MHz, that is, 20 RBs, out of 5 MHz (effective band 4.5 MHz) of the entire carrier A to the base station 10a. Allocate for use. The 0.9 MHz portion (5 RB) overlapping with the carrier B is not allocated for communication with the mobile station connected to the base station 10a.

  In addition, in the uplink, the base station control unit 103a allocates 15 RBs in the region 601a of the carrier A for PUSCH. In addition, the base station control unit 103a allocates the region 612a for the PUCCH in the region 602a. Further, the base station control unit 103a allocates the area 613a for the PUCCH in the area 603a.

  Next, the base station control unit 103a transmits the assigned downlink radio resource and uplink uplink resource allocation information to the mobile station 11a (and other mobile stations connected to the base station 10a) via the base station communication unit 101a. (Step S102a). The mobile station 11a receives the information (step S103a).

  Subsequently, the base station control unit 103a communicates with the mobile station 11a through the base station communication unit 101a and the base station baseband unit 102a (step S104a).

  FIG. 7B shows operations of the base station 10b and the mobile station 11b. First, the base station control unit 103a allocates the used downlink radio resources and the used uplink radio resources, which are part of the carrier B, to the mobile station 11b (and other mobile stations connected to the base station 10b) (step S101b). .

  At this time, in the downlink, the base station control unit 103b communicates with the mobile station connecting all of the 5 MHz (effective band 4.5 MHz) of the entire carrier B including the part overlapping with the carrier A to the base station 10b. Assign for use.

  In addition, in the uplink, the base station control unit 103b allocates 15 RBs in the region 601b of the carrier B for PUSCH. In addition, the base station control unit 103b allocates the region 612b for the PUCCH in the region 602b. Furthermore, the base station control unit 103b allocates the area 613b for the PUCCH in the area 603a.

  Next, the base station control unit 103b assigns the assigned downlink radio resource and uplink radio resource assignment information to the mobile station 11b (and other mobile stations connected to the base station 10b) via the base station communication unit 101b. ) (Step S102b). The mobile station 11b receives the information (step S103b).

  Subsequently, the base station control unit 103b communicates with the mobile station 11b through the base station communication unit 101b and the base station baseband unit 102b (step S104b).

  As described above, according to the communication system 1 according to an embodiment of the present invention, in a communication method such as TD-LTE, an overlapping portion in which a plurality of carriers are overlapped for a downlink is assigned to one communication device (base station 10a). And the mobile station 11a) is not used but the other communication device (base station 10b and mobile station 11b) uses it to secure the carrier bandwidth, speed up the communication, and assign it to the communication method. It is possible to prevent radio wave interference with other systems by placing the carrier within the specified frequency band. In addition, regarding the uplink, an overlapping portion in which a plurality of carriers are overlapped is classified (priority) and used by each communication device (base station 10a and mobile station 11a, base station 10b and mobile station 11b). As a result, it is possible to secure the carrier bandwidth and increase the communication speed, and to prevent the radio wave interference with other systems by placing the carrier in the frequency band assigned to the communication method.

  In the present embodiment, the communication system 1 uses the second frequency band of the 9 MHz band. However, the present invention is not limited to this, and the second frequency band may be a band less than 9 MHz or more than 9 MHz. . In this case, according to the bandwidth of the second frequency band, the bandwidth of the first frequency band and the bandwidth of overlapping portions of a plurality of carriers are appropriately changed.

  In this embodiment, as shown in FIG. 5, the base station 10a and the mobile station 11a do not use the overlapping part of the carrier A, and the base station 10b and the mobile station 11b use the overlapping part of the carrier B. However, the present invention is not limited to this, and the base station 10a and the mobile station 11a may use the overlapping portion of the carrier A, and the base station 10b and the mobile station 11b may not use the overlapping portion of the carrier B.

  In the present embodiment, as shown in FIG. 6, for carrier A, regions 612 a and 613 a in region 602 a and region 603 a (602 b) in FIG. 6, and region 602 b (603 a) for carrier B, Of 603b, the regions 612b and 613b are assigned for PUCCH, but the present invention is not limited to this, and the radio resources used by carrier A and carrier B may be divided so as not to overlap.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each means, each step, etc. can be rearranged so that there is no logical contradiction, and a plurality of means, steps, etc. can be combined or divided into one. .

1 Communication system 10a, 10b Base station (communication device)
11a, 11b Mobile station (communication device)
101a, 101b Base station communication unit 102a, 102b Base station baseband unit 103a, 103b Base station control unit 111a, 111b Mobile station communication unit 112a, 112b Mobile station baseband unit 113a, 113b Mobile station control unit 501a, 502a, 503a 501b, 502b, 503b region 601a, 602a, 603a, 612a, 613a region 601b, 602b, 603b, 612b, 613b region

Claims (12)

  1. A plurality of communications in which wireless communication is performed by arranging a plurality of the carriers in the second frequency band that exceeds the bandwidth of the second frequency band defined in advance when the carriers of the first frequency bandwidth are continuously arranged. A communication system comprising an apparatus,
    In the second frequency band, the communication system is configured such that a part of each carrier is overlapped and the first communication apparatus uses one of the carriers that is overlapped and the other carrier. And a second communication device that uses the wireless communication device, a portion that is preferentially used by each communication device among the overlapping portions is divided in units of radio resources divided by frequency and time ,
    The first communication device and the second communication device receive only control data from a radio terminal at the same timing by preferentially using the radio resource divided in the overlapping portion. system.
  2. The communication system is:
    The first communication device and the second communication device receive data from the wireless terminal at a first timing, and the first communication device and the second communication device receive data from the wireless terminal at a second timing. Send
    In the second frequency band, when a part of each carrier is overlapped and arranged, a rule that determines a portion used by the first communication device and the second communication device is defined as the first timing and the second timing. And different in advance,
    In the first timing, in the second frequency band, a part of each carrier is arranged to be overlapped, one of the carriers arranged to be partly overlapped is used by the first communication apparatus, and the other Each communication device receives only control data by dividing a portion that each communication device preferentially uses so that the second communication device uses the second carrier,
    In the second timing, in the second frequency band, a part of each carrier is arranged so as to overlap, and the first communication apparatus or the first using one carrier arranged so that the part overlaps is used. The communication system according to claim 1, wherein the second communication device does not use an overlapping portion included in the carrier.
  3. An effective band for transmitting and receiving a radio signal in the first frequency bandwidth is 4.5 MHz, a bandwidth of the second frequency band is 9 MHz, and a bandwidth of the overlapping portion is 0.9 MHz. The communication system according to claim 1 or 2 .
  4. The overlapping part has 10 slots, the first communication device uses a high-frequency part of the overlapping part as a preferential area, and the second communication device has a low frequency in the overlapping part. The communication system according to claim 3 , wherein the part is used as a preferential area.
  5. A plurality of communications in which wireless communication is performed by arranging a plurality of the carriers in the second frequency band that exceeds the bandwidth of the second frequency band defined in advance when the carriers of the first frequency bandwidth are continuously arranged. A communication method comprising an apparatus,
    In the second frequency band, a part of each carrier is arranged in an overlapping manner, a first communication device that uses one of the carriers arranged in a part of the overlapping part, and a second that uses the other carrier a communication device, divided by the radio resource units of the communication device is classified by frequency and time for the portion that is to be used preferentially within the duplicate portion,
    The first communication device and the second communication device receive only control data from a radio terminal at the same timing by preferentially using the radio resource divided in the overlapping portion. Method.
  6. The first communication device and the second communication device receive data from the wireless terminal at a first timing, and the first communication device and the second communication device receive data from the wireless terminal at a second timing. Send
    In the second frequency band, when a part of each carrier is overlapped and arranged, a rule that determines a portion used by the first communication device and the second communication device is defined as the first timing and the second timing. And different in advance,
    In the first timing, in the second frequency band, a part of each carrier is arranged to be overlapped, one of the carriers arranged to be partly overlapped is used by the first communication apparatus, and the other Each communication device receives only control data by dividing a portion that each communication device preferentially uses so that the second communication device uses the second carrier,
    In the second timing, in the second frequency band, a part of each carrier is arranged so as to overlap, and the first communication apparatus or the first using one carrier arranged so that the part overlaps is used. The communication method according to claim 5, wherein the second communication apparatus does not use an overlapping portion included in the carrier.
  7. An effective band for transmitting and receiving a radio signal in the first frequency bandwidth is 4.5 MHz, a bandwidth of the second frequency band is 9 MHz, and a bandwidth of the overlapping portion is 0.9 MHz. The communication method according to claim 5 or 6 .
  8. The overlapping part has 10 slots, the first communication device uses a high-frequency part of the overlapping part as a preferential area, and the second communication device has a low frequency in the overlapping part. The communication method according to claim 7 , wherein the area is used as a preferential area.
  9. A plurality of communications in which wireless communication is performed by arranging a plurality of the carriers in the second frequency band that exceeds the bandwidth of the second frequency band defined in advance when the carriers of the first frequency bandwidth are continuously arranged. A first communication device in a communication system comprising the device,
    In the second frequency band, a part of each carrier is arranged in an overlapping manner, one of the carriers in which the part is arranged in an overlapping manner is used, and the second communication apparatus uses the other carrier,
    In the overlapping part, the part that each communication device uses preferentially is divided in units of radio resources divided by frequency and time ,
    The first communication device and the second communication device receive only control data from a radio terminal at the same timing by preferentially using the radio resource divided in the overlapping portion. apparatus.
  10. The first communication device and the second communication device receive data from the wireless terminal at a first timing, and the first communication device and the second communication device receive data from the wireless terminal at a second timing. Send
    In the second frequency band, when a part of each carrier is overlapped and arranged, a rule that determines a portion used by the first communication device and the second communication device is defined as the first timing and the second timing. And different in advance,
    In the first timing, in the second frequency band, a part of each carrier is arranged to be overlapped, one of the carriers arranged to be partly overlapped is used by the first communication apparatus, and the other Each communication device receives only control data by dividing a portion that each communication device preferentially uses so that the second communication device uses the second carrier,
    In the second timing, in the second frequency band, a part of each carrier is arranged so as to overlap, and the first communication apparatus or the first using one carrier arranged so that the part overlaps is used. The communication apparatus according to claim 9, wherein the second communication apparatus does not use an overlapping portion included in the carrier.
  11. An effective band for transmitting and receiving a radio signal in the first frequency bandwidth is 4.5 MHz, a bandwidth of the second frequency band is 9 MHz, and a bandwidth of the overlapping portion is 0.9 MHz. The communication device according to claim 9 or 10 .
  12. 12. The communication apparatus according to claim 11 , wherein the overlapping portion has 10 slots, and a portion of the overlapping portion that is used preferentially is a high frequency region or a low frequency region.
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