JP5555760B2 - Base station apparatus and method - Google Patents

Base station apparatus and method Download PDF

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JP5555760B2
JP5555760B2 JP2012268686A JP2012268686A JP5555760B2 JP 5555760 B2 JP5555760 B2 JP 5555760B2 JP 2012268686 A JP2012268686 A JP 2012268686A JP 2012268686 A JP2012268686 A JP 2012268686A JP 5555760 B2 JP5555760 B2 JP 5555760B2
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base station
station apparatus
control information
mesh
transmission power
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JP2013078133A (en
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佑太 寒河江
仁 吉野
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株式会社Nttドコモ
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  The present invention relates to an apparatus that handles control signals for a radio system in general, such as a common control channel, and more particularly to a base station apparatus, a radio control apparatus, a terminal apparatus, and a method.

  A cognitive pilot channel (CPC) that distributes information such as frequencies and radio schemes used in each region has been proposed for all radio systems operated in each region. By applying the cognitive pilot channel, it is possible to eliminate the process of scanning the basic parameter information of the wireless system to which the terminal device can be connected. In addition, by applying the cognitive pilot channel, it is possible to cope with the change of the above distribution information even when some parameters of the wireless system are changed. The cognitive pilot channel can be applied without changing the terminal device itself.

Therefore, by adopting the present technology, it is possible to reduce the price of the terminal device and cope with the change of the radio system parameter. In addition, it becomes possible to easily shift to a radio system with high frequency utilization efficiency by making it possible to cope with changes in radio system parameters. In the present technology, the area covered by the base station apparatus is divided into a plurality of meshes. A control signal is transmitted in an area covered by the base station apparatus. And the utilization method of a radio | wireless resource is notified in multiple times in this mesh unit. The information to be notified may be the same. FIG. 1 shows a downlink broadcast cognitive pilot channel. In the example shown in FIG. 1, the area of the base station apparatus covers, N m-number (N m is, N m> 1 integer) is divided into meshes. In each mesh, control information is periodically transmitted continuously. When detecting the cognitive pilot channel, the terminal device waits until control information corresponding to the mesh in which the terminal device is located is transmitted. The total time (T m , B ) at which control information is transmitted in each mesh depends on the bit rate at which the downlink broadcast cognitive pilot channel is transmitted. T m , B includes a plurality of time slots indicated by Ts. In this way, the terminal device can synchronize with all information sequences transmitted on the channel.

  However, the radio control apparatus that distributes all radio system parameters described in the background art has the following problems. For example, when distributing such a radio control signal, the terminal device cannot perform communication using each operating radio system unless it can receive the control signal. Also, the terminal device must ensure sufficient communication quality in an area where communication using radio resources is provided.

  However, since the control signal is distributed in units of meshes, the radio system operated in the mesh or its radio parameters may be different. In this case, the control signal may be different for each mesh to be distributed, and as a result, is different for each base station apparatus. For this reason, it is difficult to apply a technique for transmitting the same signal from all base station apparatuses such as a single frequency network (SFN) that can provide sufficient reception quality to improve reception quality. For example, as shown in FIG. 2, a case where cells # 1 and # 2 in which cognitive pilot channels are transmitted exists (hereinafter referred to as CPC Cell # 1 and CPC Cell # 2) will be described. CPC Cell # 1 and CPC Cell # 2 include a plurality of meshes. In such a case, as shown in FIG. 3, the timing at which the cognitive pilot channel is transmitted in mesh #i included in CPC Cell # 1, and the mesh # included in CPC Cell # 2 adjacent to mesh #i When the timing at which the cognitive pilot channel is transmitted in j overlaps, the terminal apparatus always receives the cognitive pilot channel that has received an interference signal having the same reception power.

  Also, it is not preferable to assign a wide band to the control signal because the overhead increases. For this reason, each base station apparatus needs to be operated with one frequency repetition using the same frequency. When considering the operation with one frequency repetition, it is essential to implement an advanced transmission / reception algorithm capable of obtaining high reception quality in the terminal device. However, it is difficult to implement an advanced algorithm in all terminal devices that use a wireless system that has been operated for some time. Therefore, it is preferable that a high-level transmission algorithm is implemented in the base station apparatus so that sufficient reception quality can be satisfied even by a terminal apparatus that implements a simple reception algorithm.

  Accordingly, the present invention has been made to solve the above-described problems, and the object thereof is to provide a terminal when the base station apparatus transmits control information in units of areas obtained by dividing an area to be covered. It is an object of the present invention to provide a base station apparatus, a radio control apparatus, a terminal apparatus, and a method capable of improving reception quality in the apparatus.

In order to solve the above problems, the base station apparatus
It means for transmitting control information of each area obtained by dividing the area covered to a plurality of mesh units,
Means for storing control information corresponding to each area divided into the plurality of meshes ;
Based on the position of each area divided into a plurality of meshes, it has a means for controlling the transmission power of the control information,
The control means controls the transmission power of the control information to be different for each area divided into the plurality of meshes .

This method
Each area obtained by dividing the area covered to a plurality of mesh units, a method in a base station apparatus which transmits control information,
Controlling the transmission power of the control information based on the position of each area divided into the plurality of meshes ;
The transmission power determined in the step of the control, have a transmitting control information corresponding to each area divided into a plurality of meshes,
In the controlling step, the transmission power of the control information is controlled to be different for each area divided into the plurality of meshes .

  According to the embodiments of the present invention, when a base station apparatus transmits control information in units of areas obtained by dividing an area to be covered, a base station apparatus that can improve reception quality in a terminal apparatus, a radio A control device, a terminal device, and a method can be realized.

It is explanatory drawing which shows the example of delivery of a cognitive pilot channel. It is explanatory drawing which shows an example of a communication system. It is explanatory drawing which shows the example of delivery of a cognitive pilot channel. It is explanatory drawing which shows the communication system which concerns on one Example. It is explanatory drawing which shows operation | movement of the base station apparatus which concerns on one Example. It is a partial block diagram which shows the base station apparatus which concerns on one Example. It is a flowchart which shows operation | movement of the base station apparatus which concerns on one Example. It is a partial block diagram which shows the base station apparatus which concerns on one Example. It is a flowchart which shows operation | movement of the base station apparatus which concerns on one Example. It is explanatory drawing which shows operation | movement of the base station apparatus which concerns on one Example. It is explanatory drawing which shows operation | movement of the base station apparatus which concerns on one Example. It is a partial block diagram which shows the base station apparatus which concerns on one Example. It is explanatory drawing which shows operation | movement of the base station apparatus which concerns on one Example. It is a partial block diagram which shows the base station apparatus which concerns on one Example. It is a flowchart which shows operation | movement of the base station apparatus which concerns on one Example. It is explanatory drawing which shows operation | movement of the base station apparatus which concerns on one Example. It is a partial block diagram which shows the radio | wireless control apparatus and base station apparatus which concern on one Example. It is explanatory drawing which shows operation | movement of the base station apparatus which concerns on one Example. It is a partial block diagram which shows the terminal device which concerns on one Example.

Embodiments of the present invention will be described below with reference to the drawings. In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.
(First embodiment)
A communication system according to the present embodiment will be described with reference to FIG. The communication system according to the present embodiment includes base station apparatuses 200 (200 1 , 200 2 ). Further, the communication system according to the present embodiment includes a radio control device. Further, the communication system according to the present embodiment includes a terminal device 100. Further, the function of the radio control apparatus may be included in the base station apparatus. Although FIG. 4 shows two base station apparatuses, three or more base station apparatuses may be used. Further, although one terminal device is shown in FIG. 4, it may be two or more.

  Each base station apparatus 200 covers a cognitive pilot channel cell (CPC Cell) (hereinafter referred to as a CPC Cell) as a region (area) for distributing control information. Each CPC Cell includes a plurality of meshes. A mesh is an area obtained by dividing an area covered by a base station apparatus into a plurality of areas. In the example shown in FIG. 4, Mesh # i included in CPC Cell # 1 and Mesh # j included in CPC Cell # 2 are adjacent to each other. In the example shown in FIG. 4, meshes with the same hatching are covered by the same wireless communication system. Here, the cognitive pilot channel is control information of each mesh. For example, the control information may include control information of a wireless communication system operated with the mesh.

  The order of meshes in which the base station apparatus 200 according to the present embodiment distributes control information will be described with reference to FIG. The control information may include a cognitive pilot channel. The control information may include a common control channel. FIG. 5 shows an example of the order of meshes distributed by the base station apparatus 200.

  The base station apparatus 200 according to the present embodiment randomizes the order of meshes to be transmitted when distributing control information of each mesh. In other words, the base station apparatus 200 changes the time interval from the previous time each time control information of each mesh is distributed. In this way, instead of distributing the same control signal at equal time intervals, by changing the time interval from the previous time, the timing at which control information is transmitted in mesh #i included in the base station apparatus 200, The probability that the control information is distributed to the mesh #j included in the CPC Cell # 2 adjacent to the mesh #i overlaps the probability. That is, in the predetermined mesh distributed by the base station apparatus 200, the mesh distributed by the adjacent base station apparatus at the same timing as the timing distributed to the predetermined mesh is made different for each distribution.

  In the example shown in FIG. 5, when distributing control information of Mesh # i in CPC Cell # 1, the time interval for distribution is randomized. By doing so, at a certain distribution timing, the timing at which control information is transmitted in Mesh # i and the timing at which control information is transmitted in mesh #j included in CPC Cell # 2 adjacent to Mesh # i Even if and overlap, the subsequent delivery timing can be varied. For this reason, the terminal device 100 located in Mesh # i can improve the reception quality because interference distributed to Mesh # j adjacent to Mesh # i is reduced. In the example shown in FIG. 5, at the first transmission timing, the control information is transmitted in mesh #i included in CPC Cell # 1, and the mesh # included in CPC Cell # 2 adjacent to mesh #i is transmitted. Although the timing at which control information is transmitted in j overlaps, the timing at which the next control information is transmitted is different.

  A base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  The base station apparatus 200 according to the present embodiment includes a random number generation unit 208. The random number generation unit 208 generates a random number for randomizing the distribution order of the control information. The random number generation unit 208 inputs the generated random number to the transmission timing determination unit 206 described later.

  The base station apparatus 200 according to the present embodiment includes a transmission timing determination unit 206. Based on the random number generated by the random number generation unit 208, the transmission timing determination unit 206 determines the distribution order of control information in each mesh included in the CPC Cell covered by the base station apparatus 200. The transmission timing determination unit 206 inputs an identifier of the mesh to be distributed to the common control channel information database unit 202 described later when the mesh transmission time comes in accordance with the determined distribution order. The mesh identifier may be included in the mesh identifier.

  The base station apparatus 200 according to the present embodiment includes a common control channel information database unit 202. The common control channel information database unit 202 holds control information necessary for communication using the wireless system in each mesh. The control information held here may be control information required at a minimum. The common control channel information database unit 202 inputs a corresponding common control channel to a control channel transmission unit 204 described later based on the input mesh identifier.

  The base station apparatus 200 according to the present embodiment includes a control channel transmission unit 204. The control channel transmission unit 204 distributes the input common control channel.

  The operation of the base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  The base station apparatus 200 generates a random number (step S702). For example, the random number generation unit 208 generates a random number. This random number may be a uniform random number, a normal random number, or a logarithmic normal random number.

  The base station apparatus 200 determines the distribution order of each mesh based on the generated random number (step S704). For example, the transmission timing determination unit 206 determines the distribution order of each mesh based on the random number generated by the random number generation unit 208.

The base station apparatus 200 transmits mesh control information according to the distribution order determined in step S704 (step S706). The transmission timing determination unit 206 notifies the common control channel information database unit 202 of the identifier of the mesh to be distributed when the mesh transmission order is reached based on the determined distribution order. Based on the mesh identifier notified by the transmission timing determination unit 206, the common control channel information database unit 202 inputs the mesh control information corresponding to the mesh identifier to the control channel transmission unit 204. The control channel transmission unit 204 modulates the input mesh control information according to a predetermined wireless communication method, and performs transmission.
(Second embodiment)
The communication system according to the present embodiment is the same as the communication system described with reference to FIG.

  The base station apparatus 200 according to the present embodiment changes the transmission power of the control information according to the position of the mesh that transmits the control information.

  A base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  The base station apparatus 200 according to the present embodiment includes a mesh position database unit 212. The mesh position database unit 212 holds the position of the mesh included in the CPC Cell covered by the base station apparatus 200.

  The base station apparatus 200 according to the present embodiment includes a reference transmission power database unit 210. The reference transmission power database unit 210 holds information indicating transmission power serving as a reference in each mesh.

  The base station apparatus 200 according to the present embodiment includes a common control channel information database unit 202. The common control channel information database unit 202 holds control information necessary for communication using the wireless system in each mesh. The control information held here may be control information required at a minimum. The common control channel information database unit 202 inputs the held control information to the control channel transmission unit 204 described later.

  The base station apparatus 200 according to the present embodiment includes a control channel transmission unit 204. The control channel transmission unit 204 distributes control information according to the transmission power held in the reference transmission power database unit 210.

  The operation of the base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  In the present embodiment, the order of meshes to which control information is transmitted is determined in advance.

  The base station apparatus 200 obtains mesh position information to be distributed in accordance with the mesh distribution order (step S902). For example, the mesh position database unit 212 obtains mesh position information to be distributed in accordance with the mesh distribution order. Then, the mesh position database unit 212 inputs mesh position information to be distributed to the reference transmission power database unit 210.

  The base station apparatus 200 obtains transmission power based on the mesh position obtained in step S902 (step S904). For example, the reference transmission power database unit 210 obtains transmission power corresponding to the position based on the input mesh position information. For example, the transmission power corresponding to the mesh included in the CPC Cell covered by the base station apparatus 200 is defined in the reference transmission power database unit 210 according to the distance from the base station apparatus 200. For example, as illustrated in FIG. 10, a small transmission power is defined for a mesh located at a short distance from the base station apparatus 200. Further, a large transmission power is defined for a mesh located at a distance far from the base station apparatus 200. This is an example, and the transmission power corresponding to the mesh position can be changed as appropriate. The reference transmission power database unit 210 inputs information indicating transmission power to the control channel transmission unit 204.

  The base station apparatus 200 transmits the common control channel input by the common control channel information database unit 202 with the transmission power obtained in step S904 (step S906). The common control channel information database unit 202 inputs the common control channel to the control channel transmission unit 204 in accordance with the mesh distribution order. The control channel transmission unit 204 transmits the input mesh control information with the transmission power notified from the reference transmission power database unit 210.

  According to the present embodiment, transmission power can be varied for each mesh to be transmitted. For this reason, it becomes possible to control interference power according to the position of a mesh. FIG. 11 shows the relationship between the transmission power of each mesh and the reception timing. In FIG. 11, the vertical axis represents transmission power, and the horizontal axis represents time.

According to the present embodiment, even when reception timings overlap in adjacent meshes, the transmission power of the control information is different. For this reason, the interference which the control information which a terminal device receives can receive can be reduced. Therefore, it is possible to control the reception quality of the control information in units of meshes and improve the reception quality in the terminal device.
(Third embodiment)
The communication system according to the present embodiment is the same as the communication system described with reference to FIG.

  The base station apparatus 200 according to the present embodiment changes the transmission power of the control information according to the position of the mesh that transmits the control information. In this case, in the base station apparatus 200 according to the present embodiment, the average transmission power is determined in advance based on the mesh position. The base station apparatus 200 according to the present embodiment performs transmission power control based on the average transmission power.

  A base station apparatus 200 according to the present embodiment will be described with reference to FIG. The base station apparatus 200 according to the present embodiment includes a random number generation unit 214 and a transmission power determination unit 216 in the base station apparatus 200 described with reference to FIG.

  The random number generation unit 214 generates a random number. This random number may be a uniform random number, a normal random number, or a logarithmic normal random number. The random number generation unit 214 inputs the generated random number to the transmission power determination unit 216.

  The transmission power determination unit 216 determines the transmission power of the control information. For example, based on the average transmission power determined in advance for each mesh, the transmission power determination unit 216 performs multiple times within the range of power that can be transmitted by the base station apparatus so as to be the average transmission power. The transmission power of the control information to be transmitted is randomly controlled. For example, the transmission power determination unit 216 determines the transmission power based on the input random number so as to satisfy the above-described condition.

According to the present embodiment, the transmission power of the control information of each mesh can be changed every time it is transmitted. For this reason, the influence of interference can always be fluctuate | varied and it is possible to improve the reception quality in a terminal device. FIG. 13 shows the relationship between transmission timing and transmission power when transmission power control is performed based on the average transmission power determined by the mesh position to be distributed. In FIG. 13, the vertical axis represents transmission power and the horizontal axis represents time.
(Fourth embodiment)
The communication system according to the present embodiment is the same as the communication system described with reference to FIG.

  The base station apparatus 200 according to the present embodiment randomizes the distribution order of each mesh, and additionally controls the transmission power based on the mesh position.

  As shown in FIG. 14, the base station apparatus 200 according to the present embodiment is a combination of the above-described base station apparatus according to the first embodiment and the base station apparatus according to the third embodiment.

  The operation of the base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  The base station apparatus 200 generates a random number (step S1502). For example, the random number generation unit 208 generates a random number.

  Base station apparatus 200 determines the distribution order of each mesh based on the generated random number (step S1504). For example, the transmission timing determination unit 206 determines the distribution order of each mesh based on the random number generated by the random number generation unit 208.

  The base station apparatus 200 obtains mesh position information to be distributed in accordance with the mesh distribution order determined in step S1504 (step S1506). For example, the mesh position database unit 212 obtains mesh position information to be distributed in accordance with the mesh distribution order. Then, the mesh position database unit 212 inputs mesh position information to be distributed to the reference transmission power database unit 210.

  The base station apparatus 200 obtains transmission power based on the mesh position obtained in step S1506 (step S1508). For example, based on the average transmission power determined in advance for each mesh, the transmission power determination unit 216 performs multiple times within the range of power that can be transmitted by the base station apparatus so as to be the average transmission power. The transmission power of the control information to be transmitted is randomly controlled. For example, the transmission power determination unit 216 determines the transmission power based on the input random number so as to satisfy the above-described condition.

  The base station apparatus 200 transmits the control information with the transmission power obtained in step S1508 according to the distribution order determined in step S1504 (step S1510).

  According to the present embodiment, the order of meshes to be distributed can be randomized. Furthermore, transmission power control can be performed based on the average transmission power determined by the mesh position to be distributed. FIG. 16 shows an example of the operation in the case of performing randomization of the order of meshes to be distributed and transmission power control based on the mesh positions to be distributed in the base station apparatus according to the present embodiment. In FIG. 16, the vertical axis represents transmission power, and the horizontal axis represents time.

  According to the present embodiment, the order of meshes to be distributed is randomized, and further, the transmission power at the time of distribution is controlled using the average transmission power based on the mesh position, so that the interference signal for the adjacent base station apparatus can be controlled. The influence can be reduced.

Moreover, you may make it combine the function of the base station apparatus which concerns on a 1st Example, and the function of the base station apparatus which concerns on a 2nd Example. By doing in this way, the order of the mesh to distribute can be randomized and transmission power can be varied for every mesh to transmit.
(Fifth embodiment)
The communication system according to the present embodiment is the same as the communication system described with reference to FIG.

In the communication system according to this embodiment, and distributes control information and the base station apparatus 200 1 and the base station apparatus 200 2 synchronize to.

The base station apparatus 200 1 and the base station apparatus 200 2 is connected to the radio control device 300. The radio network controller 300 synchronizes the base station apparatus 200 1 and the base station apparatus 200 2. The base station apparatus 200 1 and the base station apparatus 200 2 in synchronization, transmits the control information of each mesh.

  A radio network controller 300 according to the present embodiment will be described with reference to FIG. Although one base station apparatus 200 is shown in FIG. 17 for convenience of explanation, a plurality of base station apparatuses 200 may be provided.

The radio network controller 300 according to the present embodiment includes a timer 302. The timer 302 synchronizes the base station device to be controlled. It is used herein to synchronize the base station apparatus 200 1 and the base station apparatus 200 2.

  The radio network controller 300 according to the present embodiment includes a base station position information storage unit 304. The base station location information storage unit 304 holds location information of a base station device connected to the radio network controller 300.

  The radio network controller 300 according to the present embodiment includes a transmission base station control unit 306. The transmission base station control unit 306 performs control to cause each base station apparatus 200 to transmit in synchronization.

  The radio network controller 300 according to this embodiment includes a common control channel information update unit 308. The common control channel information update unit 308 manages and updates the control information of the area that is held and managed by all the base station devices controlled by the radio network controller 300.

  A base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  The base station apparatus 200 according to the present embodiment includes a network (NW) timer synchronization control unit 218. NW timer synchronization control section 218 controls synchronization with other base station apparatuses based on timer information notified from radio control apparatus 300.

  The base station apparatus 200 according to the present embodiment includes a timer 222. The timer 222 is held by the base station apparatus 200. The timer 222 is controlled by the NW timer synchronization control unit 218.

  The base station apparatus 200 according to the present embodiment includes a GPS signal receiving unit 220. The GPS signal receiving unit 220 receives a GPS signal for correcting the delay when the timer information notified from the wireless control device 300 is delayed.

  The base station apparatus 200 according to the present embodiment includes a time synchronization control unit 224. The time synchronization control unit 224 performs time synchronization based on the timer information input by the timer 222. Further, the time synchronization control unit 224 corrects time synchronization based on the GPS signal input from the GPS signal reception unit 220 when the timer information notified from the radio network controller 300 is delayed.

  The base station apparatus 200 according to the present embodiment includes a transmission mesh information control unit 226. The transmission mesh information control unit 226 performs control to distribute the transmission time notified from the radio control apparatus 300 as a mesh control signal. Further, the transmission mesh information control unit 226 may perform control to distribute the transmission power notified from the radio control apparatus 300 as a mesh control signal.

  The base station apparatus 200 according to the present embodiment includes a common control channel information database unit 202. The common control channel information database unit 202 holds the control signal of each mesh notified from the transmission mesh information control unit 226 and the radio network controller 300.

  The base station apparatus 200 according to the present embodiment includes a control channel transmission unit 204. The control channel transmission unit 204 transmits control information.

According to the present embodiment, when the distribution order is randomized and the transmission power to be distributed is further controlled, the same is applied to the adjacent base station apparatus with respect to the mesh that is considered to be difficult to ensure the reception quality. Control information is transmitted at the same transmission time. For example, as illustrated in FIG. 18, the radio network controller 300 covers a mesh that overlaps a mesh distributed by another base station device among meshes distributed by each base station device, and covers the overlapping mesh. The apparatus is controlled so that the distribution timing is the same. In this way, the terminal device 100 can improve the reception power of the control signal. Also, since different mesh control information is not distributed from the adjacent base station apparatus, the terminal apparatus 100 can remove the interference signal and improve the reception quality. The same applies to the combination of the base station apparatus described with reference to FIG. 17 and the base station apparatus described with reference to FIG. 6, FIG. 8, FIG. 12, or FIG.
(Sixth embodiment)
The communication system according to the present embodiment is the same as the communication system described with reference to FIG.

  The terminal device 100 according to the present embodiment is applied to all the embodiments described above.

  The terminal device 100 according to the present embodiment will be described with reference to FIG.

  The terminal device 100 according to the present embodiment includes a received signal synthesis processing unit 102. The received signal combining processing unit 102 performs control for combining control signals transmitted from the base station apparatus 200 a plurality of times.

  The terminal device 100 according to the present embodiment includes a received signal storage unit 104. The reception signal storage unit 104 holds a received signal until reception processing is performed.

  The terminal device 100 according to the present embodiment includes a synthesis processing control unit 106. The synthesis processing control unit 106 synthesizes the received signal.

  The terminal device 100 according to the present embodiment includes a control signal processing unit 108. Based on the control signal, the control signal processing unit 108 performs control based on information on the wireless system operated in the mesh in which the terminal device 100 is present.

  In the wireless communication system according to the present embodiment, the control information of each mesh is transmitted a plurality of times with different distribution intervals and / or transmission power. For this reason, the terminal device 100 can obtain different reception quality for each transmission. It is preferable that the terminal device 100 performs the combining process in the reception signal combining processing unit 102 in consideration of the difference in reception quality. By doing so, the reception quality can be improved. By combining received signals, there is a high possibility that reception quality in an environment with small interference power will be obtained at the next transmission opportunity even if the interference power is too large because the distribution order of adjacent base station devices is different. is there. In addition, even when the transmission power is too small, there is a high possibility that a good reception quality can be obtained with high transmission power in the next distribution order.

  According to the base station apparatus according to the present embodiment, the distribution order of each mesh is randomized. For example, a mesh to be distributed is randomly extracted, and control information for the mesh is distributed. By doing in this way, it can always be set as a different receiving state, without giving the same interference signal with respect to a terminal device. For example, since adjacent base station apparatuses similarly distribute information of different meshes, different interference signals are generated when the terminal apparatus receives the information. As a result, reception quality can be improved in the terminal device.

  Moreover, according to the base station apparatus which concerns on a present Example, transmission power is determined based on the mesh position to deliver. By doing in this way, the influence of the interference signal transmitted with respect to a terminal device from an adjacent base station apparatus can be reduced. For example, the transmission power at the time of distribution may be set to the minimum power that can be received within the mesh to be distributed. This is because transmission is performed with the minimum power that can be received within the mesh, so that transmission with excessive power is not performed, and a signal that interferes with an adjacent area can be reduced. Also, for example, the average transmission power for each mesh is defined, the average value is satisfied, and the transmission power of the control information transmitted a plurality of times is randomly controlled within the range of power that can be transmitted by the base station apparatus. May be. By randomly selecting the transmission power, it is possible to reduce the interference signal for the adjacent area in a certain transmission time. In particular, the reception success probability can be increased in the case of a plurality of identical signal transmissions such as the control signal assumed this time.

  Moreover, according to the base station apparatus which concerns on a present Example, by performing the transmission power control based on the randomization of the mesh order to deliver and / or the mesh position to deliver, this terminal apparatus requires It is possible to reduce the probability of receiving information on meshes simultaneously with a large interference signal, and to improve reception quality.

  Moreover, according to the base station apparatus which concerns on a present Example, the control information of a part of mesh is transmitted simultaneously in a some base station apparatus. By doing so, it is possible to reduce interference signals and improve reception quality with respect to the terminal device. For example, adjacent areas, such as the edge of the area that each base station device is in charge of, where the reception quality cannot be ensured efficiently even when transmission is performed based on the maximum transmission power or highly efficient distribution order The same control signal may be distributed at the same transmission time from the base station apparatus operating in FIG. This is because it is possible to improve reception power and reduce interference power by distributing the same control signal during the same transmission time. Further, randomization of the order of meshes to be distributed and / or transmission power control based on mesh positions to be distributed may be performed simultaneously. For example, in order to distribute the same control signal at the same transmission time, the radio control apparatus that controls the base station apparatus controls the distribution time, transmission power, and the like of a mesh that is preferably transmitted at the same time. And based on this control, a radio | wireless control apparatus selects a delivery time at random with respect to the mesh which does not transmit the same signal with respect to a base station apparatus.

  According to the terminal device according to the present embodiment, since the control signals are distributed a plurality of times, not only the reception processing of these signals is performed at every distribution timing, but also the signals received so far can be synthesized. According to the terminal apparatus, by combining signals received so far, a time diversity effect can be obtained and reception quality can be improved.

The following items are further disclosed regarding the embodiment including the above examples.
(1) means for transmitting control information in units of areas obtained by dividing an area to be covered;
Means for storing control information corresponding to the divided areas;
Means for determining a distribution order for each of the divided areas,
The base station apparatus characterized in that the determining means randomly determines a distribution order for each of the divided areas.
(2) In the base station apparatus according to (1),
A base station apparatus comprising: means for controlling transmission power of the control information based on the positions of the divided areas.
(3) In the base station apparatus according to (1) or (2),
Having means for synchronizing with other base station devices,
The determining means determines so that a timing of distributing to the divided area overlapping with the other base station apparatus is the same as a timing of distributing to the overlapping divided area of the other base station apparatus. A base station apparatus.
(4) means for transmitting control information in units of areas obtained by dividing an area to be covered;
Means for storing control information corresponding to the divided areas;
And a means for controlling transmission power of the control information based on the position of the divided area.
(5) In the base station apparatus according to (2) or (4),
The base station apparatus characterized in that the means for controlling randomly controls the transmission power of the control information such that the power determined based on the position of the divided area becomes an average value.
(6) In the base station apparatus according to any one of (1) to (5),
The base station apparatus characterized in that the means for transmitting transmits the control information a plurality of times.
(7) In the base station apparatus according to any one of (1) to (6),
The base station apparatus characterized in that the control information includes control information of a plurality of radio communication systems operated in the divided area.
(8) A wireless control device that controls a plurality of base station devices,
The base station device distributes control information in units of areas obtained by dividing an area to be covered,
Means for synchronizing the plurality of base station devices;
Among the divided areas covered by each base station apparatus, the distribution of the divided areas overlapping with the divided areas covered by other base station apparatuses is performed on the base station apparatus covering the overlapping divided areas. And a means for controlling the timing to be the same.
(9) A terminal device in a communication system having a base station device that transmits control information in units of areas obtained by dividing an area to be covered,
The base station apparatus randomly determines a distribution order for each of the divided areas, and transmits the control information a plurality of times.
Means for storing control information transmitted a plurality of times;
Means for combining the control information transmitted a plurality of times.
(10) In the terminal device according to (9),
The base station apparatus controls the transmission power of the control information based on the position of the divided area.
(11) A terminal device in a communication system having a base station device that transmits control information in units of areas obtained by dividing an area to be covered,
The base station device controls transmission power of the control information based on the position of the divided area, and transmits the control information a plurality of times.
Means for storing control information transmitted a plurality of times;
Means for combining the control information transmitted a plurality of times.
(12) A method in a base station apparatus that transmits control information in units of areas obtained by dividing an area to be covered,
Randomly determining the distribution order for each of the divided areas;
Transmitting the control information corresponding to the divided areas according to the distribution order determined in the determining step.
(13) A method in a base station apparatus for transmitting control information in units of areas obtained by dividing an area to be covered,
Controlling the transmission power of the control information based on the position of the divided area;
Transmitting the control information corresponding to the divided area by the transmission power determined in the controlling step.

100 terminal device 102 receives the signal synthesis processing unit 104 receives the signal storage unit 106 synthesis processing controller 108 control signal processing unit 200 (200 1, 200 2) the base station apparatus 202 common control channel information database unit 204 control channel transmission unit 206 transmission timing Determination unit 208 Random number generation unit 210 Reference transmission power database unit 212 Mesh position database unit 214 Random number generation unit 216 Transmission power determination unit 218 Network timer synchronization control unit 220 GPS signal reception unit 222 Timer 224 Time synchronization control unit 226 Transmission mesh information control unit DESCRIPTION OF SYMBOLS 300 Radio control apparatus 302 Timer 304 Base station position information storage part 306 Transmission base station control part 308 Common control channel information update part

Claims (5)

  1. It means for transmitting control information of each area obtained by dividing the area covered to a plurality of mesh units,
    Means for storing control information corresponding to each area divided into the plurality of meshes ;
    Based on the position of each area divided into a plurality of meshes, it has a means for controlling the transmission power of the control information,
    The base station apparatus characterized in that the control means controls the transmission power of the control information to be different for each area divided into the plurality of meshes .
  2. The base station apparatus according to claim 1,
    The control means randomly controls the transmission power of the control information so that the power determined based on the position of each area divided into the plurality of meshes becomes an average value. apparatus.
  3. In the base station apparatus according to claim 1 or 2,
    The base station apparatus characterized in that the means for transmitting transmits the control information a plurality of times.
  4. The base station apparatus according to any one of claims 1 to 3,
    The base information is characterized in that the control information includes control information of a plurality of radio communication systems operated in each area divided into the plurality of meshes .
  5. Each area obtained by dividing the area covered to a plurality of mesh units, a method in a base station apparatus which transmits control information,
    Controlling the transmission power of the control information based on the position of each area divided into the plurality of meshes ;
    The transmission power determined in the step of the control, have a transmitting control information corresponding to each area divided into a plurality of meshes,
    In the controlling step, the transmission power of the control information is controlled to be different for each area divided into the plurality of meshes .
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