JP2009088643A - Allocation method of spatially multiplexing slot, and adaptive array base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spatially multiplexing slot allocation technology for improving convenience of a user by reliably receiving all the connection requests without rejecting them and allocating radio resource by taking a wireless resource of the whole system into consideration. <P>SOLUTION: The base station is provided with: a reception part for receiving connection requests transmitted by a new terminal; a determination part for determining whether or not a carrier frequency used by a new terminal for transmission has reached a maximal spatially multiplexing number; an acquisition part for acquiring information about a driving state of another terminal allocated in a full slot system using the carrier frequency when the number of spatially multiplexing in the carrier frequency is maximal as a result of determination; and a control unit for changing a slot allocation system in a terminal where value indicating the information about the acquired operation state exceeds a prescribed value from the full slot system into a sub-slot system, controls allocation of the slot of the terminal exceeding the prescribed value, and controls allocation of the slot in a state of the changed slot allocation with respect to the new terminal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a spatial multiplexing slot allocation method and an adaptive array base station.

In a conventional adaptive array base station spatial multiplexing scheme, the adaptive array base station rejects a new communication connection request from a terminal when the maximum number of spatial multiplexing is reached. Therefore, a technique has been proposed in which calls are classified according to call levels, calls that are not spatially multiplexed are determined, and an appropriate service grade is provided (see Patent Document 1).
JP 2002-58061 A

  However, although the above-described conventional technology makes it possible to provide an appropriate service grade for a call, the following problems arise when the number of spatial multiplexing at a specific carrier frequency reaches a maximum. That is, when the number of spatial multiplexing at a specific carrier frequency reaches the maximum, when a terminal (terminal A) assigned a spatial multiplexing slot at the specific carrier frequency moves, another terminal having the same carrier frequency as the terminal A There is a possibility that the terminal (terminal B) to which the spatial multiplexing slot is allocated is subject to interference by the transmission wave radiated for terminal A. In other words, due to the influence of the transmission wave for terminal A transmitted by the adaptive array base station, communication between terminal B sharing the same spatial multiplexing slot as terminal A and the adaptive array base station may be subject to interference. . At this time, if another spatial multiplexing slot is free, the adaptive array base station can reallocate another free spatial multiplexing slot to terminal B, thus avoiding interference of terminal B. Is done. However, when the number of spatial multiplexing reaches the maximum at all carrier frequencies, the adaptive array base station cannot reassign spatial multiplexing slots to terminal B. Therefore, the possibility that the terminal B receives interference due to the influence of the transmission wave transmitted from the adaptive array base station to the moving terminal A increases. Also, in this situation, it is still not possible to accept a new call connection. FIG. 6 is a configuration diagram of an adaptive array base station according to the conventional technique, and FIG. 7 is a flowchart illustrating processing of a connection request to the adaptive array base station according to the conventional technique. That is, as shown in these figures, in the prior art, when a new connection request is received in a state where the maximum number of spatial multiplexing has been reached, connection of a new call is rejected regardless of whether it is a narrowband call or a wideband call. It was. Thus, in the conventional technique, when a new connection request is received in a state where the maximum spatial multiplexing number has been reached, in order to reject the connection of a new call, unless the hardware is improved and the maximum spatial multiplexing number is increased, It was impossible to increase the number of concurrent users. In addition, since the spatial multiplex slot assignment was “first come first served”, there was a case where a new call could not be connected and the frequency utilization efficiency of the entire system was deteriorated.

  Therefore, the present invention, when reaching the maximum spatial multiplexing number, to another terminal assigned to the same spatial multiplexing slot as the moving terminal, to the other terminal by the moving terminal It is another object of the present invention to provide a spatial multiplexing slot allocation method and an adaptive array base station that can reduce the interference and further accept a new call and improve user convenience.

    In order to solve the above-described problems, the spatial multiplex slot allocation method according to the first invention is a spatial multiplex slot allocation method in an adaptive array base station that communicates with a terminal. An acquisition step of acquiring information relating to a movement state of another terminal allocated in a full slot scheme using the carrier frequency when the carrier frequency used by the terminal has reached the maximum spatial multiplexing number; A control step of changing the slot allocation scheme in the terminal whose information acquired in the acquisition step exceeds a predetermined value from the full slot scheme to the subslot scheme and performing slot allocation control of the terminal exceeding the predetermined value; , In the slot allocation state changed in the control step, slot allocation control for the new terminal A second control step of performing, characterized in that it comprises a.

  According to the first feature, by changing the slot allocation method for a terminal in a moving state exceeding a predetermined value from the full slot method to the subslot method, not only can it be allocated to a new call, Interference with other terminals assigned to the same spatial multiplexing slot can be reduced, and empty subslots can be provided by changing the slot system. Here, the information on the moving state means (1) moving speed, (2) change amount of the position of the terminal in the cell with which the adaptive array base station communicates, and the like. The information related to the movement state may be estimated from the signal quality acquired by the adaptive array base station at the time of communication, or the terminal acquires information related to the movement state of itself and the information about the movement state acquired at the time of communication. Information may be transmitted to the adaptive array base station. Then, the adaptive array base station determines whether or not there is a possibility of interference due to the influence of the movement state of the terminal with respect to other terminals assigned to the spatial multiplexing slots in the same carrier frequency. Can be determined by whether or not exceeds a predetermined value.

  The spatial multiplexing slot allocation method according to the second invention is characterized in that the information on the movement state means a movement speed.

  According to the second feature, by changing the slot allocation method for terminals whose moving speed exceeds a predetermined moving speed from the full slot system to the subslot system, not only becomes possible to allocate to a new call. Since the communication timing with the terminal exceeding the predetermined moving speed is shortened, the interference with other terminals assigned to the spatial multiplexing slot in the same carrier frequency as the terminal exceeding the predetermined moving speed can be reduced.

  The spatial multiplex slot allocation method according to a third aspect of the present invention, when a connection request is made from the new terminal, determines whether the call of the new terminal is a narrowband call (or a wideband call) based on the connection request. A determination step of determining whether the call of the new terminal is a narrowband call, and in the second control step, allocation control is performed on the new terminal by a subslot method. It is characterized by performing.

  According to the third feature, frequency utilization efficiency can be improved by assigning a new call, which is a narrowband call, to an empty subslot caused by the change of the slot system.

  The spatial multiplexing slot allocation method according to the fourth aspect of the present invention is that, when there is a connection request from the new terminal, does a value indicating information on a movement state of the new terminal that has requested the connection exceed a second predetermined value? A step of determining whether or not a value indicating information on a movement state of the new terminal exceeds the second predetermined value, the sub-step is performed on the new terminal in the second control step. It is characterized in that assignment control is performed in a slot manner.

  According to the fourth feature, not only can the frequency utilization efficiency be improved by allocating a new call whose movement state information exceeds a predetermined value to an empty subslot caused by the change of the slot system, Interference with other terminals can be reduced by moving the terminal of the call.

  The spatial multiplex slot allocation method according to the fifth aspect of the present invention is that when a connection request is received from the new terminal, a value indicating the communication quality (QoS: Quality of Service) of the new terminal is based on the connection request. A determination step of determining whether or not the predetermined value exceeds the third predetermined value, and when the value indicating the communication quality of the new terminal exceeds the third predetermined value, It is characterized in that allocation control is performed on a terminal by a subslot method.

  According to the fifth feature, by assigning a new call having a high QoS to an empty subslot caused by the change of the slot system, a subslot can be preferentially assigned to the terminal of the new call.

  The spatial multiplexing slot allocation method according to a sixth aspect of the present invention is that, in the control step, when the slot allocation scheme in the terminal exceeding the predetermined value is changed from the full slot scheme to the subslot scheme, the maximum space in the uplink When the multiplexing number is larger than the maximum spatial multiplexing number in the downlink, the number of subslots in the downlink is set according to the maximum spatial multiplexing number in the uplink.

  According to the sixth feature, when the maximum spatial multiplexing number in the uplink is larger than the maximum spatial multiplexing number in the downlink, the subslot is changed from the full slot scheme in the downlink according to the maximum spatial multiplexing number in the uplink. Change to method. As a result, interference with other terminals assigned spatial multiplexing slots in the same carrier frequency can be reduced, and empty subslots can be provided.

  In the spatial multiplexing slot allocation method according to the seventh invention, in the control step, the maximum number of spatial multiplexing in the uplink and the number of slots that can be allocated to the terminal in the downlink are the same. It is characterized by being set.

  According to the seventh feature, when the maximum spatial multiplexing number in the uplink and the maximum spatial multiplexing number in the downlink are different and the slot length in the transmission / reception slot of the time division duplex scheme is asymmetric (for example, in the base station) , Reception slot length: transmission slot length = 1: 2) Since the sub-slot to be allocated is only the transmission slot in the base station and the reception slot may be left as a full slot, communication quality and communication area deterioration due to sub-slot formation Can be kept to a minimum.

  As described above, the solution of the present invention has been described as a method. However, the present invention can be realized as a device (base station), a program, and a storage medium that records the program, substantially equivalent to these. It should be understood that these are included within the scope of the present invention.

  For example, an adaptive array base station (such as a wireless communication device) according to the eighth invention that implements the present invention as a device is a connection transmitted from a new terminal in an adaptive array base station that communicates with the terminal using the spatial multiplexing slot method. A receiving unit that receives the request; a determining unit that determines whether a carrier frequency used for transmission by the new terminal has reached a maximum spatial multiplexing number; and, as a result of determination in the determining unit, the carrier frequency When the number of spatial multiplexing is the maximum, an acquisition unit for acquiring information on the movement status of other terminals allocated by the full slot method using the carrier frequency, and information on the movement status acquired by the acquisition unit The slot allocation method for terminals with a value exceeding the predetermined value is changed from the full slot method to the subslot method. Performs allocation control of terminal slots exceeding value, characterized in that it comprises a control unit that performs allocation control slot in the state of the change in slot assignment to the new terminal.

  According to the present invention, a new call can be allocated to an empty subslot generated by changing the slot system by changing the slot allocation system for a terminal in a moving state from a full slot system to a subslot system. In addition, it is possible to reduce interference with other terminals assigned to the same spatial multiplexing slot as the terminal in the moving state.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an adaptive array base station according to an embodiment of the present invention. As shown in the figure, the adaptive array base station 100 includes a burst receiving unit 110 that receives a burst, a moving speed determining unit 120 that determines whether or not the moving speed of a terminal exceeds a predetermined moving speed, and VoIP (Voice over IP). ) (Narrowband call) determination unit 130 for determining whether or not (narrowband call), QoS determination unit 140 for determining QoS, slot allocation control unit 150 for controlling slot allocation, and managing the maximum number of spatial multiplexing And a maximum spatial multiplexing number determining unit 160 that determines whether or not the maximum spatial multiplexing number has been reached, a subslot managing unit 170, a burst transmitting unit 180 that transmits an AA burst, and a subslot switching control unit 190. The adaptive array base station 100 further includes an adaptive array antenna ANT composed of a plurality of antennas.

  Next, the data flow is shown. First, an RA burst (connection request) or burst is transmitted from the terminal side (not shown) to the base station side and received by the burst receiving unit 110. Next, the movement speed determination unit 120 acquires the movement speed of the terminal as information regarding the movement state of the terminal. In acquiring the moving speed, information on the moving speed acquired by the terminal itself, which is embedded in advance in the RA burst, is read from the high-speed moving bit. Alternatively, the base station may estimate from phase changes in a plurality of known signals included in the frame. Furthermore, a fading speed (corresponding to a moving speed) estimation method may be used. This movement speed is acquired not only when an RA burst is received but also every time a burst is received from a terminal. At approximately the same time, the VoIP (narrowband call) determination unit 130 reads a VoIP (narrowband call) bit embedded in advance in the RA burst. Alternatively, when a terminal is registered (registered), a terminal identification number ID is assigned to each terminal, and at the time of this registration, a wideband call or a narrowband call is already determined, or the terminal side can designate it. In this case, it is not necessary to include a VoIP (narrowband call) bit in the RA burst, and if the terminal identification number ID at the time of registration is included, it is possible to determine whether the call is a wideband call or a narrowband call. It becomes. Further, almost simultaneously, the QoS determination unit 140 reads a QoS (communication quality) bit embedded in advance in the RA burst. Next, the slot allocation control unit 150 performs slot allocation control using a spatial multiplexing slot allocation algorithm (method) described in detail later while referring to information of the maximum spatial multiplexing number determination unit 160 and the subslot management unit 170. Do.

  Next, burst transmission section 180 notifies the allocation result to the terminal. Further, the subslot switching control unit 190 performs control so as to switch from the full slot to the subslot with respect to the full slot assigned to the terminal already connected to the slot as necessary. Here, the “full slot” means a normal slot configuration. On the other hand, the “sub-slot” is, for example, a slot configuration in which a “full slot” is divided into two by time share for one set (two units) of users. As a method of time sharing, a method of alternately using even frames and odd frames by two users, or a method of dividing slots into the first half and the second half and using them by two users can be considered.

  FIG. 2 is a flowchart showing processing of the spatial multiplexing slot allocation algorithm (method) according to the embodiment of the present invention. As shown in the figure, first, in step S10, when the base station (communication apparatus that controls slot allocation and spatial multiplexing) receives an RA burst (connection request) from a terminal, the terminal transmits an AA burst (full slot). It is determined whether or not the carrier frequency that transmitted (allocation) has reached the maximum spatial multiplexing (step S11). If the maximum spatial multiplexing has not been reached (corresponding to step S11 No), an AA burst (full slot allocation) is transmitted to the terminal that has transmitted the RA burst (connection request) (step S12).

  On the other hand, if it is determined in step S11 that the carrier frequency has already reached maximum spatial multiplexing (corresponding to Yes in step S11), it is next determined whether or not the call is a VoIP (narrowband call). (Step S13). This determination may be made by notifying the terminal contract status (type of narrowband contract, broadband contract, etc.) at the time of registration of the terminal that transmitted the call, or including a band designation in the connection request call itself. The determination is made based on these pieces of information. If it is determined in step S13 that the call is not VoIP (narrowband call), that is, a wideband call, the moving speed information of the terminal in the call is acquired, and whether or not the predetermined moving speed is exceeded. Is determined (step S14). If it is determined in step S14 that the moving speed of the terminal is not a predetermined moving speed, that is, the terminal moves at a low speed or does not move, the QoS (communication quality) of the call is acquired, and a predetermined QoS ( It is determined whether or not the communication exceeds (communication quality) (step S15). In step S15, when it is determined that the QoS (communication quality) of the terminal does not exceed the predetermined QoS (communication quality), the process proceeds to step S17, where an AA burst (connection rejection) is transmitted to the terminal, and the process is performed. Finish. In this case, the rejected terminal needs to shift to a different carrier frequency and transmit an RA burst (connection request) again to retry the connection.

  On the other hand, if it is determined in step S13 that the call is a VoIP (narrowband call), if it is determined in step S14 that the terminal is moving at a speed exceeding a predetermined moving speed, or If it is determined in step S15 that the QoS (communication quality) of the call exceeds a predetermined QoS (communication quality), the moving speed information of the terminal assigned by the full slot method at the carrier frequency is acquired. (Step S16). This movement speed information may be estimated from the signal quality acquired by the base station during communication after full slot allocation for each terminal, or the terminal acquires information regarding its own movement state and The base station may acquire information on the acquired movement state. Then, it is determined whether or not the acquired movement speed information exceeds a predetermined movement speed (step S18). Among the terminals that have acquired the moving speed information at the carrier frequency that has reached the maximum spatial multiplexing number in step S18, all of the terminals that do not exceed the predetermined moving speed, that is, terminals that are moving or moving at a low speed. If it is determined that there is, the process proceeds to step S17, where an AA burst (connection rejection) is transmitted to the terminal, and the process ends.

  On the other hand, if it is determined in step S18 that there is a terminal exceeding the predetermined movement speed among the movement speed information acquired from each terminal, the terminal moving above the predetermined movement speed is occupied. In order to turn the full slot into a subslot, the terminal informs the terminal that in some field of the header part of the full slot, the next frame is converted into a subslot and switched to the first half or the second half of the same slot to which the full slot is assigned. The slot occupied by the terminal is released. Then, in the next frame, a subslot is assigned (step S19). A slot allocated to a terminal exceeding a predetermined movement is subslotted and reassigned, and then the RA burst is transmitted (connection requested) using the carrier frequency for which the subslotting is performed. AA burst (subslot allocation) is transmitted to the terminal of, and the process ends (step S20).

  FIG. 3 is a flowchart showing the processing of a spatial multiplexing slot allocation algorithm (method) according to another embodiment of the present invention. This embodiment provides a technique for accepting connection requests even for broadband calls. Further, this embodiment is the same as the embodiment of FIG. 2 except for steps S30, S31, S32, S33, and S34, and only differences from the process of FIG. 2 will be described. As shown in FIG. 3, when it is determined in step S18 that there is a terminal exceeding a predetermined movement speed in the movement speed information acquired from each terminal, the terminal moves beyond the predetermined movement speed. In order to make a full slot occupied by a terminal occupied by a sub-slot, the process proceeds to step S30, the mobile terminal moves beyond a predetermined moving speed in the same spatial multiplexing, and a set of terminals occupying the full slot (that is, It is determined whether or not there are two in total. If the determination condition is not satisfied in step S30, the process proceeds to step S19. When the determination condition is satisfied in step S30 (when there is one set of terminals that move beyond the predetermined moving speed and occupy the full slot in the same spatial multiplexing), each full slot to be paired is selected. A switching pair (pair) is formed in each subslot (steps S31 and S32), and the process proceeds to step S33. Then, it is determined whether or not there is a space that becomes a full slot as a result of the full slot method to the subslot method. (Allocation) is transmitted (step S20). On the other hand, if the determination condition is not satisfied (that is, there is a free space), an AA burst (full slot allocation) is transmitted to the terminal and the process ends (step S34). Further, according to the determination result of step S33, the slot is not allocated to the terminal of the new call by the full slot method, but the slot is allocated by the subslot method according to the determination result of step S13 to step S15. Also good.

  Thus, according to the present embodiment, it is possible to receive a connection request without being rejected even for a broadband call after reaching the maximum spatial multiplexing number. That is, there is an advantage that the terminal does not need to retry the connection by shifting to another carrier frequency and transmitting the RA burst (connection request) again. If the determination condition in step S18 is not satisfied, the process is not terminated, but it is determined whether the call to which the full slot is allocated is VoIP (narrowband call). Similarly to subslotting performed for a terminal call exceeding the predetermined moving speed, subslotting of the full slot to which the call is assigned may be performed. As a result, it is possible to expect a further increase in the number of simultaneously connected users and an improvement in frequency utilization efficiency.

  FIG. 4 is a timing chart for explaining an example of the subslot system according to the present invention. FIG. 4A shows an original time slot (full slot) of the full slot system, where the upper Tx when viewed from the base station is the time slots # 1 to # 3 on the transmission side, and the lower Rx Are time slots # 1 to # 3 on the receiving side, which are asymmetric time intervals.

  FIG. 4B shows a state in which subslots are formed by alternately allocating slots according to even frames and odd frames. For user 1, slot # 1 of frame F1 which is an odd frame is assigned as subslot SS11, and slot # 1 of frame F3 is assigned as subslot SS12. Similarly, for user 2, slot # 1 of frame F2, which is an even frame, is assigned as subslot SS21, and slot # 1 of frame F4 is assigned as subslot SS22.

  FIG. 4C shows a method of dividing one time slot into a first half part and a second half part to form subslots. User 3 is assigned the first half of slot # 1 of each frame F1 to F4 as subslots SS31 to SS34. On the other hand, the second half of slot # 1 of each frame F1 to F4 is assigned to user 4 as subslots SS41 to SS44. Note that the slot on the receiving side, which is half the bandwidth of the slot on the transmitting side, is left as a full slot, and if any user's slot is temporarily shared, communication quality and communication by subslotting Area degradation can be kept to a minimum.

  FIG. 5 is a timing chart for explaining an example of the subslot system according to the present invention. A user exceeding a predetermined moving speed that previously occupied the full slot is subslotted, and a new wideband call user is assigned a full slot. The case which gives is shown. FIG. 5A shows an original time slot (full slot) of the full slot system similar to FIG.

  FIG. 5B shows the full slot FS51 for the user 5 who does not exceed the predetermined moving speed, the full slot FS61 for the user 6 exceeding the predetermined moving speed, and the user 7 exceeding the predetermined moving speed in # 1 of the frame F1. A full slot FS71 is allocated to each. Here, consider a case where there is one set (ie, two in total) of terminals (user 6 and user 7) that move beyond the predetermined moving speed in the same spatial multiplexing and occupy full slots. The base station sub-slots user 6 and user 7 exceeding a predetermined moving speed into a pair, so that in some field of the header portion of full slots FS61 and FS71, subslot is made from the next frame F2 and the slot # 1 The switch to the first half and the second half is transmitted to the users 6 and 7, and the slot occupied by the user 7 is released. Then, subslots SS61 and SS71 are allocated to users 6 and 7 in the next frame F2. Subslots SS62 and SS72 are allocated to users 6 and 7 in the subsequent frame F3. A full slot FS81 can be assigned to the user 8 of the wideband call, and a full slot FS82 can be assigned to the subsequent frame F3, at least from the next frame F2 to the user 8 of the new wideband call. In this way, it is possible to rescue and accept a user of a broadband call such as the user 8 that has been rejected after reaching the maximum multiplexing number. On the other hand, the user 5 who does not exceed the predetermined moving speed continues to obtain FS52 and FS53 as full slots.

  In the embodiment, the sub-slot allocation has been described with reference to only the transmission side frame, but it should be noted that even a slot for reception can be allocated in the same manner. In the embodiment, the sub-slotting is divided into two or a form using full slots alternately. However, it may be divided into three or a form using a full slot only once every three times. Also, in subslotting, when dividing into a plurality of subslots, when the maximum spatial multiplexing number in the uplink in which the base station communicates with the terminal is larger than the maximum spatial multiplexing number in the downlink, In accordance with the maximum spatial multiplexing number, by changing from the full slot method to the subslot method in the downlink, by matching the maximum spatial multiplexing number in the uplink and the number of slots that can be allocated to the terminal in the downlink, The subslots to be allocated are only transmission slots in the base station, and the reception slots may be full slots. Therefore, degradation of communication quality and communication area due to subslots can be minimized.

  As described above, in the adaptive array base station and the control method thereof according to the present invention, in the state where the maximum spatial multiplexing number is reached, the allocation method for the user is improved, and until the maximum spatial multiplexing number is reached, Even if the maximum spatial multiplexing number is reached while maintaining the communication quality, it is possible to reduce the interference caused by the movement of other users, further increase the number of simultaneously connected users, and improve the frequency utilization efficiency. In particular, as in the current iBurst (registered trademark) base station, when the maximum spatial multiplexing number differs between the receiving side and the transmitting side (receiving side maximum spatial multiplexing number> transmitting side maximum spatial multiplexing number), and the TDD transmission / reception slot length is When asymmetric (reception: transmission = 1: 2), the subslot allocated to VoIP (narrowband call) is only the transmission side, and the reception side may remain a full slot. Degradation can be kept to a minimum. Further, since the conventional algorithm is followed until the maximum spatial multiplexing number is reached, the communication quality of each user is not affected.

  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. In addition, the functions included in each part, each means, each step, etc. can be rearranged so that there is no logical contradiction, and it is possible to combine or divide a plurality of means, steps, etc. into one. It is.

FIG. 2 is a block diagram of an adaptive array base station according to an embodiment of the present invention. It is a flowchart which shows the process of the spatial multiplexing slot allocation algorithm (method) by the embodiment of this invention. It is a flowchart which shows the process of the spatial multiplexing slot allocation algorithm (method) by another embodiment of this invention. It is a timing chart explaining an example of the subslot system by this invention. It is a timing chart explaining an example of the subslot system by this invention. It is a block diagram of the adaptive array base station by a prior art. It is a flowchart which shows the process of the connection request | requirement to the adaptive array base station by a prior art.

Explanation of symbols

100 adaptive array base station 110 burst receiving unit 120 moving speed determining unit 130 VoIP determining unit 140 QoS determining unit 150 slot allocation control unit 160 maximum spatial multiplexing number determining unit 170 subslot managing unit 180 burst transmitting unit 190 subslot switching control unit ANT Adaptive array antenna F1-F4 Frame FS51-FS53 Full slot FS61 Full slot FS71 Full slot FS81, FS82 Full slot SS11, SS12 Subslot SS21, SS22 Subslot SS31-SS34 Subslot SS41-SS44 Subslot SS61, SS62 Subslot SS71, SS72 subslot

Claims (8)

In a spatial multiplex slot allocation method in an adaptive array base station that communicates with a terminal,
When there is a connection request from a new terminal, if the carrier frequency used by the new terminal has reached the maximum spatial multiplexing number, the other frequency allocated in the full slot method using the carrier frequency An acquisition step for acquiring information about the movement state of the terminal;
A control step of changing the slot allocation method in the terminal whose value indicating the information acquired in the acquisition step exceeds a predetermined value from the full slot method to the subslot method, and performing slot allocation control of the terminal exceeding the predetermined value;
A second control step of performing slot allocation control for the new terminal in the slot allocation state changed in the control step;
A spatial multiplex slot allocation method comprising: The information on the movement state means a movement speed.
The spatial multiplexing slot assignment method according to claim 1, wherein: When there is a connection request from the new terminal,
A determination step of determining whether the call of the new terminal is a narrowband call based on the connection request;
Further including
When the call of the new terminal is a narrowband call, in the second control step, allocation control is performed on the new terminal by a subslot method.
The spatial multiplexing slot allocation method according to claim 1 or 2, characterized by the above. When there is a connection request from the new terminal,
Determining whether a value indicating information on a movement state of the new terminal that has made the connection request exceeds a second predetermined value;
Further including
When the value indicating the information on the movement state of the new terminal exceeds the second predetermined value, in the second control step, allocation control is performed on the new terminal by a subslot method.
The spatial multiplexing slot allocation method according to claim 1 or 2, characterized by the above. When there is a connection request from the new terminal,
A determination step of determining whether a value indicating communication quality of the new terminal exceeds a third predetermined value based on the connection request;
Further including
When the value indicating the communication quality of the new terminal exceeds the third predetermined value, in the second control step, allocation control is performed on the new terminal by a subslot method.
The spatial multiplexing slot allocation method according to claim 1 or 2, characterized by the above. In the control step, when the slot allocation scheme in the terminal exceeding the predetermined value is changed from the full slot scheme to the subslot scheme, the maximum spatial multiplexing number in the uplink is larger than the maximum spatial multiplexing number in the downlink The number of subslots in the downlink is set according to the maximum spatial multiplexing number in the uplink.
The spatial multiplexing slot allocation method according to claim 1, wherein: In the control step, the maximum spatial multiplexing number in the uplink and the number of slots that can be allocated to the terminal in the downlink are set to be the same number.
The spatial multiplexing slot allocation method according to claim 6. In an adaptive array base station that communicates with a terminal by a spatial multiplexing slot method,
A receiving unit for receiving a connection request transmitted from the new terminal;
A determination unit that determines whether the carrier frequency used for transmission by the new terminal has reached the maximum spatial multiplexing number;
As a result of determination in the determination unit, when the number of spatial multiplexing at the carrier frequency is the maximum, an acquisition unit that acquires information on the movement status of other terminals allocated by the full slot method using the carrier frequency; ,
The slot allocation method in the terminal in which the value indicating the information regarding the movement state acquired by the acquisition unit exceeds a predetermined value is changed from the full slot method to the subslot method, and the slot allocation control of the terminal exceeding the predetermined value is performed. A control unit for performing allocation control in the changed slot allocation state for the new terminal;
An adaptive array base station comprising:

Images