JP5329389B2 - Frequency resource allocation method and system for wireless communication system - Google Patents

Description

  The present invention relates to a frequency resource allocating method and a system therefor when a plurality of types of wireless communication systems with different wireless communication schemes and operators coexist in the same frequency band.

  A radio communication system using a cognitive radio technology that shares a certain frequency band among a plurality of types of radio communication systems and efficiently uses frequency resources has been proposed. A method of overlaying a new radio communication system on an existing radio communication system that uses an allocated frequency band can be realized by using this cognitive radio technology.

  In a license band of an existing wireless communication system, there is an unused frequency band that is not temporarily used depending on traffic conditions. On the other hand, recently constructed wireless communication systems are supposed to provide services that require a wide band such as cloud computing, and require more efficient use of limited frequency resources. In order to use frequency efficiently, a radio communication system using a cognitive radio technology in which a certain frequency band is shared by a plurality of types of radio communication systems and frequency resources are efficiently used has been proposed (for example, see Patent Document 1). ).

  In Patent Document 1, in a wireless communication system using a cognitive wireless technology that uses a unused band by performing carrier sense in a license band of another wireless communication system, L (L ≧ 2) frequencies before the start of communication. A first carrier sense of the band is performed, and as a result of the first carrier sense, M frequency bands (L ≧ M ≧ 2) that are not used are selected from the L frequency bands, and communication is performed. The second carrier sense of the M frequency bands is performed in the first carrier sense section of the time slot at the time of the start request, and as a result of the second carrier sense, it is used from among the M frequency bands. A technique has been proposed in which a transmission frequency band that is not used is determined and a signal is transmitted in a transmission section that follows the carrier sense section using the determined transmission frequency band.

JP 2007-300421 A

  However, even if the technique of Patent Document 1 is used, the new radio communication system can use only a band that is not used by the existing radio communication system, so that the usable frequency band is efficient for the new radio communication system. There is a problem that it cannot be used. Furthermore, as a result, the effect of the technology for efficiently using the frequency of the new wireless communication system cannot be fully exhibited, and the frequency diversity gain and the frequency scheduling gain (or multiuser diversity gain) are not optimized. There is a problem.

  Therefore, the present invention has been made to solve the above-described problems, and a plurality of types of wireless communication systems coexist in the same frequency band so that the frequency allocation of the new wireless communication system becomes efficient. It is an object of the present invention to provide a frequency resource allocation method and system therefor.

  In order to achieve the above object, the broadband wireless communication system according to the present invention recognizes a band that is not used by the narrowband wireless communication system based on usable bandwidth information obtained from a carrier sense or a bandwidth management controller, A minimum physical resource block PRB of the wideband wireless communication system is divided as necessary based on the usable bandwidth information, and a bandwidth is allocated.

  On the other hand, the broadband wireless communication system allocates the smallest physical resource block PRB of the broadband wireless communication system to a local band having a large amplitude value of the transmission path estimation result for each terminal, and allocates the band to the narrowband wireless communication system. May be used, the transmission of only the control channel is performed for a certain period of time for the band being used, and the interference avoidance operation may be urged to the narrowband wireless communication system.

  In addition, when the broadband wireless communication system allocates the minimum physical resource block PRB of the broadband wireless communication system so as to be distributed within the system bandwidth, and the band is used by the narrowband wireless communication system, Transmission of only the control channel may be performed for a certain period of time for the band being used, and the interference avoidance operation may be encouraged in the narrowband wireless communication system.

  In addition, it is preferable to provide a dedicated band for the narrowband wireless communication system to guarantee the band.

  According to the present invention, it is possible to effectively use frequency resources by reducing the unused frequency band by sharing the same frequency in a plurality of types of wireless communication systems, and the frequency allocation of the broadband wireless communication system becomes efficient. By allocating optimal frequency resources to the broadband wireless communication system, it is possible to improve frequency diversity gain and frequency scheduling gain (or multiuser diversity gain).

The system block diagram provided with the zone | band management controller in 1st Example of this invention. 1 is a block diagram showing a system configuration when there are a plurality of base stations of an existing narrowband wireless communication system and a new broadband wireless communication system. The flowchart in the case of implement | achieving the function of the said FIG. 2 with software using CPU, DSP, FPGA, etc. in a bandwidth management controller. The schematic diagram which shows the specific example of the frequency band allocation in the said Example. The block diagram which shows the principal part structure of the base station of the novel wideband radio | wireless communications system in the said Example. 6 is a flowchart when the function of FIG. 5 is realized by software using a CPU, DSP, FPGA or the like in the base station. The schematic diagram which shows the specific example of the frequency band allocation in a 2nd Example. The block diagram which shows the principal part structure of the base station of the novel broadband wireless communication system in the said 2nd Example. The flowchart in the case of implement | achieving the function of the said FIG. 8 with software using CPU, DSP, FPGA, etc. in a base station. The schematic diagram which shows the specific example of the frequency band allocation in a 3rd Example. The block diagram which shows the principal part structure of the base station of the novel wideband radio | wireless communications system in the said 3rd Example. 12 is a flowchart when the function of FIG. 11 is realized by software using a CPU, DSP, FPGA or the like in the base station. An example of a procedure for changing the occupied band of an existing narrowband wireless communication system using the interference avoidance operation of the existing narrowband wireless communication system, which is implemented by software using a CPU, DSP, FPGA, etc. in the base station of the new broadband wireless communication system Flow chart of the case. FIG. 14A is a system configuration diagram when changing the frequency band allocation of an existing narrowband wireless communication system using the bandwidth management controller without using the interference avoidance operation of the existing narrowband wireless communication system. FIG. 14B shows the time of bandwidth allocation information notification. 1 is a block diagram showing a system configuration when there are a plurality of base stations of an existing narrowband wireless communication system and a new broadband wireless communication system. The flowchart in the case of implement | achieving the function of the said FIG. 15 by software using CPU, DSP, FPGA, etc. in a bandwidth management controller. The schematic diagram which shows the specific example of the frequency band allocation which provided the band only for the existing narrowband radio | wireless communications system, and guaranteed the band.

Here, as a premise
An existing wireless communication system is an old narrowband wireless communication system (hereinafter, existing narrowband wireless communication system) that allocates narrowband frequency resources to a single user.
The new wireless communication system is a broadband wireless communication system (hereinafter referred to as a new broadband wireless communication system) that can divide and allocate broadband frequency resources to a plurality of users.
The existing narrowband wireless communication system recognizes the wireless communication system using the corresponding band by carrier sense without distinguishing the type of the wireless communication system.
Assume that.

  First, as a first embodiment, a minimum physical resource block (hereinafter referred to as PRB) of a new broadband wireless communication system is divided without changing the band used by the existing narrowband wireless communication system, and a new A frequency resource allocation method and system for a new broadband wireless communication system that allocates a broadband wireless communication system to an unused frequency band of an existing narrowband wireless communication system will be described.

  In the new wideband wireless communication system of the first embodiment, the band used by the existing narrowband wireless communication system is recognized by the carrier sense or the usable band information from the band management controller.

  FIG. 1 is a system configuration diagram including a bandwidth management controller. The bandwidth management controller 10 uses the used bandwidth information notified from the base stations 21 to 24 of the existing narrowband wireless communication system and the base stations 21 to 24 and 31 of the existing narrowband wireless communication system and the new wideband wireless communication system. The usable bandwidth information is created based on the cover area information and notified to the base station 31 of the new broadband wireless communication system. As a result, a band that is not used by the base stations 21 to 24 of the existing narrowband wireless communication system is set as a usable band of the new broadband wireless communication system within the coverage area of the new broadband wireless communication system.

  Specifically, using FIG. 1, the base stations 21 to 24 of the existing narrowband wireless communication system include the bands A to F within the system bandwidth, the base station 21 is the band A, and the base station 22 is the base station 22. Assuming that the band B, the base station 23 uses the band D, and the base station 24 uses the band E, each of them notifies the band management controller 10 of the information. On the other hand, the bandwidth management controller 10 notifies the base station 31 of the new broadband wireless communication system of the unused bandwidths C and F among the bandwidths A to F within the system bandwidth.

  FIG. 2 is a block diagram showing a system configuration when there are a plurality of base stations of the existing narrowband wireless communication system and the new broadband wireless communication system. The bandwidth management controller 10 is notified of in-use band information from the base stations 21 to 2i of the existing narrowband wireless communication system, and the base stations 21 to 2i of the existing narrowband wireless communication system and the new wideband wireless communication system. , 31 to 3j are preliminarily input and stored in a storage medium such as a semiconductor memory. The bandwidth management controller 10 uses the in-use bandwidth information notified from the base stations 21 to 2i of the existing narrowband wireless communication system, and the base stations 21 to 2i and 31 of the existing narrowband wireless communication system and the new wideband wireless communication system. Based on the coverage area information of ˜3j, the usable bandwidth information is notified to each of the base stations 31 to 3j of the new broadband wireless communication system.

  FIG. 3 is a flowchart when the above functions are realized by software using a CPU, DSP, FPGA, etc. in the bandwidth management controller. When the processing starts, the bandwidth management controller 10 first collects in-use bandwidth information from each of the base stations 21 to 2i of the existing narrowband wireless communication system (step S101). Next, the coverage area of each base station 21 to 2i of the existing narrowband wireless communication system is associated with the in-use band information (step S102). Further, a band that can be used in the cover area of each of the base stations 31 to 3j of the new broadband wireless communication system is extracted (step S103). Based on these, the available bandwidth is notified to each of the base stations 31 to 3j of the new broadband wireless communication system (step S104).

  FIG. 4 is a schematic diagram showing a specific example of the frequency band allocation described above. Here, it is assumed that one carrier occupied bandwidth of the existing narrowband wireless communication system is N, and the minimum physical resource block PRB of the new wideband wireless communication system is M (three times N). Assuming that the in-use bands of the existing narrowband wireless communication system are four blocks ad as shown in the figure, the usable band blocks include a single usable band block 1 and six consecutive usable band blocks 2. -7 and two continuous usable bandwidth blocks 8 and 9. In this case, the minimum physical resource block PRB1 of the new broadband wireless communication system includes two continuous usable bandwidth blocks 8 and 9, and one usable bandwidth block 7 in six consecutive usable bandwidth blocks 2 to 7. It can be assigned by dividing into two corresponding to. On the other hand, the PRB 2 can be allocated without being divided into three consecutive usable bandwidth blocks 4 to 6 in six consecutive usable bandwidth blocks 2 to 7. The PRB 3 can be allocated by dividing the PRB 3 into two corresponding to the two continuous usable bandwidth blocks 2 and 3 in the six continuous usable bandwidth blocks 2 to 7 and the single usable bandwidth block 1.

  FIG. 5 is a block diagram showing a main part configuration for performing the above-described processing in the base station of the new broadband wireless communication system, and realizing it by software using a CPU, DSP, FPGA, etc. in the base station FIG. 6 shows a flowchart of the above.

  The PRB allocation unit 30a illustrated in FIG. 5 divides transmission information into PRB units and allocates the transmission information to a plurality of PRBs (step S201 in FIG. 6). Based on the usable bandwidth information as described above, the bandwidth allocation unit 30b allocates M usable bandwidth blocks (9 in FIG. 4) to the PRBs divided as described above as necessary (FIG. 6). Step S202).

  When the allocation of the frequency band is completed as described above, the base station of the new broadband wireless communication system uses the usable band, and a signal for the terminal to establish time and frequency synchronization with the base station (hereinafter referred to as a downlink synchronization channel). ), A known reference signal for downlink transmission path estimation (hereinafter referred to as downlink pilot channel) and a signal for notifying system information such as a base station number (hereinafter referred to as downlink common control channel) are transmitted. The usable bandwidth information is transmitted on the common control channel or another downlink control channel.

  After establishing synchronization with the base station, the terminal transmits a signal including registration information to the base station (hereinafter referred to as uplink access channel). When the base station can receive the uplink access channel, the base station transmits an ACK signal that is an acknowledgment signal. The terminal periodically transmits the transmission path estimation result using the downlink pilot channel to the base station using the uplink common control channel. Further, a known reference signal (hereinafter referred to as an uplink pilot channel) for uplink transmission path estimation is also transmitted.

  When starting communication from a base station to a terminal, information (hereinafter referred to as a downlink paging channel) for notifying that there is data to be transmitted from the base station to the corresponding terminal and band information (hereinafter referred to as band allocation information) used for transmission / reception. The included signal (hereinafter referred to as downlink dedicated control channel) is transmitted. If the terminal can receive the downlink paging channel, the terminal transmits an ACK signal.

  When communication from the terminal to the base station is started, a signal including information for notifying that there is data to be transmitted from the terminal to the base station (hereinafter referred to as uplink dedicated control channel) is transmitted. When the base station can receive the uplink dedicated control channel, the base station transmits an ACK signal and a downlink dedicated control channel. Band allocation information transmitted through the downlink dedicated control channel is determined using the downlink / uplink transmission path estimation result or the received signal power.

  As described above, the unused band of the existing narrowband radio communication system can be efficiently used by dividing the PRB of the new wideband radio communication system as necessary and allocating the band. A plurality of PRBs are allocated to one terminal or to a plurality of terminals.

  The existing narrowband wireless communication system recognizes a wireless communication system using a corresponding band by carrier sense without distinguishing the type of the wireless communication system, and does not use it when occupied.

  In the above embodiment, the case where the band controller 10 is used has been described. However, the base station of the new broadband wireless communication system recognizes the band used by the existing narrowband wireless communication system by carrier sense. In this way, the same operation and effect as described above can be obtained, and the band controller 10 is not required.

  Next, as a second embodiment, a frequency resource allocation method for a new broadband wireless communication system that changes a band used by an existing narrowband wireless communication system and allocates the new broadband wireless communication system to a local frequency band, and The system will be described.

  FIG. 7 is a schematic diagram showing a specific example of frequency band allocation in the present embodiment, where 1 carrier occupied bandwidth of the existing narrowband radio communication system is N, and the minimum physical resource block PRB of the new wideband radio communication system is M (3 times N) is the same as in the previous embodiment. In the new broadband wireless communication system of the present embodiment, as shown in FIG. 7, the band to be allocated is determined based on the downlink / uplink transmission path estimation result of the system band. In order to improve the frequency scheduling gain for each terminal, a locally continuous band having a large amplitude value of the transmission path estimation result is assigned to the PRB for each terminal (UE1 and UE2 in FIG. 7). As shown in FIG. 7, when the existing narrowband radio communication system uses the desired band (PRB of UE1 and UE2) of the new wideband radio communication system (in use band blocks a to e, the used band block c, e), and the band used by the existing narrowband wireless communication system (in-use band blocks c, e) is changed to usable band blocks as indicated by arrows as described later.

  FIG. 8 is a block diagram showing a main part configuration for performing the above-described processing in the base station of the new broadband wireless communication system, and realizing it by software using a CPU, DSP, FPGA, etc. in the base station FIG. 9 shows a flowchart of the above.

  The PRB allocation unit 30a illustrated in FIG. 8 divides transmission information into PRB units and allocates the transmission information to a plurality of PRBs as in the above embodiment (step S301 in FIG. 9). The local band allocation unit 30c is based on the transmission path estimation result and the usable band information as described above, and the amplitude value of the transmission path estimation result of M usable band blocks selected so as to be locally continuous assuming a change. Is calculated (step S302 in FIG. 9), and the usable bandwidth blocks are assigned to each PRB in descending order of the sum of the amplitude values of the transmission path estimation results of M usable bandwidth blocks (step S303 in FIG. 9).

  When the frequency band assignment is completed as described above, wireless communication is started in the same manner as in the first embodiment.

  As described above, frequency scheduling for each terminal is performed by changing the band used by the existing narrowband radio communication system and allocating the PRB of the new wideband radio communication system to a locally continuous frequency band without dividing the PRB. Gain can be improved and optimized.

  Next, as a third embodiment, a frequency resource allocation method for a new wideband wireless communication system in which a bandwidth used by an existing narrowband wireless communication system is changed and the new wideband wireless communication system is distributed and allocated to the system band, and The system will be described.

  FIG. 10 is a schematic diagram showing a specific example of frequency band allocation in the present embodiment, where N is a carrier occupied bandwidth of an existing narrowband wireless communication system, and N is a minimum physical resource block PRB of a new wideband wireless communication system. M (3 times N) is the same as in the previous embodiment. In the new broadband wireless communication system of this embodiment, in order to improve the frequency diversity gain, as shown in FIG. 10, the PRBs 1 to 3 of the new broadband wireless communication system are allocated so as to be evenly distributed within the system bandwidth. Similar to the second embodiment, when the existing narrowband radio communication system is using the desired band (PRB1 to 3) of the new wideband radio communication system (in use band blocks a to d, the used band Blocks a and d are applicable), and the band used by the existing narrowband wireless communication system (in-use band blocks a and d) is changed to usable band blocks as indicated by arrows as described later.

  FIG. 11 is a block diagram showing a main part configuration for performing the above-described processing in the base station of the new broadband wireless communication system. In the case where it is realized by software using a CPU, DSP, FPGA, etc. in the base station. The flowchart is shown in FIG.

  The PRB allocation unit 30a illustrated in FIG. 11 divides transmission information into PRB units and allocates the transmission information to a plurality of PRBs as in the above embodiment (step S401 in FIG. 12). The distributed band allocation unit 30d allocates M usable bandwidth blocks, which are selected so as to be evenly distributed and continuously based on the usable bandwidth information as described above, to each PRB (step S402 in FIG. 12). ).

  When the frequency band assignment is completed as described above, wireless communication is started in the same manner as in the first embodiment.

  As described above, by changing the band used by the existing narrowband radio communication system and assigning the PRB of the new wideband radio communication system to the continuous frequency band evenly distributed without dividing, the frequency diversity Gain can be improved and optimized.

  Next, the change of the occupied band of the existing narrowband wireless communication system required in the second and third embodiments will be described.

  FIG. 13 shows an example of a procedure for changing the occupied band of an existing narrowband wireless communication system using the interference avoidance operation of the existing narrowband wireless communication system, and software using the CPU, DSP, FPGA, etc. in the base station of the new broadband wireless communication system It is a flowchart in the case of implement | achieving by hardware.

  When the base station of the new broadband wireless communication system starts the channel assignment operation, first, it is checked whether there is an empty channel as a result of carrier sense (step S501). If there is a free channel (YES in step S501), it is checked whether or not local bandwidth allocation is possible using this free channel (step S502). If possible, the flow proceeds directly to the channel allocation process (step S502). YES in S502).

  As a result of carrier sense, if there is no free channel (NO in step S501), or local bandwidth allocation is not possible even if there is a free channel (NO in step S502), the existing narrow band is in the channel being used. It is checked whether or not there is a wireless communication system (step S503). Here, if there is no existing narrowband wireless communication system, channel allocation is impossible (NO in step S503). On the other hand, if there is an existing narrowband wireless communication system (YES in step S503), the retry counter N is set to “0” (step S504).

  Next, before starting the desired data communication, the new broadband wireless communication system transmits only the control channel so that the existing narrowband wireless communication system moves the used channel to another band by the channel switching operation (step S505). That is, the operation of changing the occupied band of the existing narrowband wireless communication system is performed in expectation of a known interference avoidance operation in the existing narrowband wireless communication system. The new broadband wireless communication system transmits only the control channel for a certain time when moving the existing narrowband wireless communication system. The existing narrowband wireless communication system that has received the signal from the new wideband wireless communication system determines that the received signal is interference and activates the channel switching operation. As a result, the existing narrowband wireless communication system and the new wideband wireless communication system Coexistence is possible. However, since the existing narrowband wireless communication system recognizes the received control signal as an interference rather than a message, the new wideband wireless communication system is the minimum necessary so as not to affect the services of the existing narrowband wireless communication system. It is necessary to limit the transmission to the limit. Specifically, after transmitting the control channel in step S505, it is checked whether or not the existing narrowband wireless communication system has performed channel movement by interference avoiding operation (step S506). The process proceeds to channel assignment processing (YES in step S506). On the other hand, if the channel is not moved, it is checked whether or not the retry counter N has exceeded a predetermined constant X. If not, “1” is added to the retry counter N, and the control channel The process returns to step S505 for performing transmission and the above-described processing is repeated. On the other hand, if the retry counter N exceeds a predetermined constant X (YES in step S507), it is checked whether there is another existing narrowband wireless communication system in the channel in use (step S509). Otherwise, channel assignment is impossible (NO in step S509). On the other hand, if there is another existing narrowband wireless communication system, the target channel is switched (YES in step S509 → step S510), and the process is repeated by returning to step 504 where the retry counter N is set to “0”. .

  As described above, there is an advantage that the bandwidth management controller is not required by effectively using the interference avoidance operation of the existing narrowband wireless communication system and changing the occupied band of the existing narrowband wireless communication system. This embodiment is effective when the base station of the new broadband wireless communication system recognizes the band used by the existing narrowband wireless communication system by carrier sense.

  FIG. 14 shows the collected band information used by the existing narrowband radio communication system using the band management controller without using the interference avoidance operation of the existing narrowband radio communication system, and the desired information of the new wideband radio communication system. It is a system block diagram in the case of allocating a frequency band to both radio | wireless communications systems based on band information.

  As shown in FIG. 14A, the bandwidth management controller 10 uses the used bandwidth information notified from the base stations 21 to 24 of the existing narrowband wireless communication system, and the desired bandwidth information notified from the base station 31 of the new broadband wireless communication system. 14B, frequency allocation information of both radio communication systems is created based on the cover area information of the base stations 21 to 24, 31 of the existing narrowband radio communication system and the new wideband radio communication system, as shown in FIG. 14B Notify

  Specifically, with reference to FIG. 14, each of the base stations 21 to 24 in the existing narrowband wireless communication system includes each of the bands A to F within the system bandwidth, the base station 21 is the band A, and the base station 22 is the base station 22. Assuming that the band B, the base station 23 uses the band D, and the base station 24 uses the band E, the information is notified to the band management controller 10 as shown in FIG. 14A. Further, the base station 31 of the new broadband wireless communication system notifies the bandwidth management controller 10 of the bandwidths B and F as desired bandwidth information among the bandwidths A to F within the system bandwidth. Based on these and the cover area information of each of the base stations 21 to 24, 31, the management controller 10 uses the band B in the base station 22 of the existing narrowband radio communication system, but the desired band of the new wideband radio communication system. Are bands B and F, as shown in FIG. 14B, the base station 22 of the existing narrowband wireless communication system is notified of the change of the frequency band assigned from the band B to the band C, and other base stations 21 , 23, 24, 31 are notified of the bandwidth allocation information as it is.

  FIG. 15 is a block diagram showing a system configuration when there are a plurality of base stations of an existing narrowband wireless communication system and a new broadband wireless communication system. The bandwidth management controller 10 is notified of in-use band information from each of the base stations 21 to 2i of the existing narrowband wireless communication system, and is notified of desired band information from each of the base stations 31 to 3j of the new narrowband wireless communication system. At the same time, the cover area information of each of the base stations 21 to 2i and 31 to 3j of the existing narrowband wireless communication system and the new broadband wireless communication system is input in advance and stored in a storage medium such as a semiconductor memory. The bandwidth management controller 10 uses in-use bandwidth information notified from the base stations 21 to 2i of the existing narrowband wireless communication system, and desired bandwidth information notified from the base stations 31 to 3j of the new narrowband wireless communication system. The allocated frequency band is changed based on the cover area information of each of the base stations 21 to 2i and 31 to 3j of the existing narrowband wireless communication system and the new broadband wireless communication system, and then the existing narrowband wireless communication system and the new broadband The usable bandwidth information is notified to each of the base stations 21 to 2i and 31 to 3j of the wireless communication system.

  FIG. 16 is a flowchart in the case where the above processing is realized by software using a CPU, DSP, FPGA, etc. in the bandwidth management controller. When the bandwidth management controller 10 starts processing, the bandwidth management controller 10 first collects in-use bandwidth information from the base stations 21 to 2i of the existing narrowband wireless communication system, and at the same time receives the desired bandwidth from the base stations 31 to 3j of the new broadband wireless communication system. Bandwidth allocation request information is collected as information (step S601). Next, the coverage area of each base station 21 to 2i of the existing narrowband wireless communication system is associated with the in-use band information (step S602). Also, the band allocation request information of the base stations 31 to 3j of the new broadband wireless communication system is associated with the cover area (step S603). Next, based on these, extraction of the base station of the existing narrowband wireless communication system that moves (changes) the used band and changes the used band are performed (step S604). Then, the available bandwidth is notified to each of the base stations 21 to 2i and 31 to 3j of the existing narrowband wireless communication system and the new broadband wireless communication system (step S605).

  As described above, by changing the occupied band of the existing narrowband wireless communication system using the bandwidth management controller without using the interference avoidance operation of the existing narrowband wireless communication system, Interference can be avoided, and adverse effects on services of existing narrowband wireless communication systems can be prevented.

  By the way, as described above, when the new narrowband wireless communication system is prioritized and the existing narrowband wireless communication system moves to another band, the available bandwidth of the existing narrowband wireless communication system may be exhausted. is assumed. In order to solve this problem, as shown in FIG. 17, it is preferable to provide a dedicated band for the existing narrowband wireless communication system so as to guarantee the band. By guaranteeing the bandwidth in this way, the existing narrowband radio communication system and the new wideband radio communication system can coexist even in a high traffic area. Can be made without any problems.

  As described above, frequency diversity gain and frequency scheduling gain (or multiuser diversity gain) can be improved by allocating optimal frequency resources to the new wideband wireless communication system, and the existing narrowband wireless communication system. Frequency resources can be effectively used. Further, by guaranteeing the minimum occupied bandwidth of the existing narrowband wireless communication system, the communication quality of the existing narrowband wireless communication system can be guaranteed.

  As described above, when a plurality of types of wireless communication systems coexist in the same frequency band, a frequency resource allocation method that prioritizes a broadband wireless communication system and the system thereof have an existing CSMA (Carrier Sense Multiple Access) function. This is particularly effective when overlaying a new wideband wireless communication system on the narrowband wireless communication system.

DESCRIPTION OF SYMBOLS 10 Band management controller 21-2i Base station of existing narrowband radio | wireless communications system 31-3j Base station of a new wideband radio | wireless communications system 30a PRB allocation part 30b Band allocation part 30c Local band allocation part 30d Distributed band allocation part

Claims (8)

A frequency resource allocation method when a narrowband wireless communication system and a broadband wireless communication system coexist in the same frequency band,
The broadband wireless communication system recognizes a band that is not used by the narrowband wireless communication system based on usable bandwidth information obtained from a carrier sense or a bandwidth management controller, and the minimum physical resource of the broadband wireless communication system. A frequency resource allocation method for a radio communication system, wherein a block PRB is allocated as necessary by dividing a block PRB based on the usable bandwidth information. A frequency resource allocation method when a narrowband wireless communication system and a broadband wireless communication system coexist in the same frequency band,
The broadband wireless communication system allocates the minimum physical resource block PRB of the broadband wireless communication system to a local band having a large amplitude value of a transmission path estimation result for each terminal, and allocates the band to the narrowband wireless communication system. Is used, the frequency resource of the radio communication system is characterized in that the narrow band radio communication system is urged to perform an interference avoidance operation by transmitting only the control channel for a certain period of time to the band being used. Assignment method. A frequency resource allocation method when a narrowband wireless communication system and a broadband wireless communication system coexist in the same frequency band,
The broadband wireless communication system allocates the minimum physical resource block PRB of the broadband wireless communication system so as to be distributed within the system bandwidth, and when the band is used by the narrowband wireless communication system, A frequency resource allocating method for a radio communication system, characterized in that transmission of only a control channel is performed for a certain period of time for a band being used to prompt the narrowband radio communication system to perform an interference avoiding operation. The frequency resource allocation method for a radio communication system according to claim 2 or 3 , wherein a dedicated band of the narrowband radio communication system is provided to guarantee the band. A frequency resource allocation system when a narrowband wireless communication system and a broadband wireless communication system coexist in the same frequency band,
A band that is not used by the narrowband radio communication system provided in the wideband radio communication system is recognized from usable band information obtained from a carrier sense or a band management controller, and the minimum physical of the wideband radio communication system is recognized. A frequency resource allocation system comprising: a base station that allocates a band by dividing a resource block PRB as needed based on the available band information. A frequency resource allocation system when a narrowband wireless communication system and a broadband wireless communication system coexist in the same frequency band,
A minimum physical resource block PRB of the broadband wireless communication system is allocated to a local band having a large amplitude value of a transmission path estimation result for each terminal, and the band is allocated to the narrowband wireless communication system. When the wireless communication system is in use, the wireless communication system has a base station that transmits only the control channel to the band being used for a certain period of time and prompts the narrowband wireless communication system to perform an interference avoidance operation. Frequency resource allocation system. A frequency resource allocation system when a narrowband wireless communication system and a broadband wireless communication system coexist in the same frequency band,
Provided in the broadband wireless communication system, the smallest physical resource block PRB of the broadband wireless communication system is allocated so as to be distributed within the system bandwidth, and the band is used by the narrowband wireless communication system. In this case, the frequency resource allocation system includes a base station that performs transmission of only a control channel for a certain band for a certain period of time and prompts the narrowband wireless communication system to perform an interference avoiding operation. Frequency resource allocation system according to claim 6 or claim 7, characterized in that to guarantee the bandwidth a dedicated band of said narrow-band radio communication system.

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