Wireless communication method and wireless communication system

Abstract

A wireless communication method comprises: an acquisition step in which a TDD wireless communication system acquires a TDD configuration of another wireless communication system which may have an overlapping communication area; a determination step in which the system determines, on the basis of the acquired TDD configuration, priority levels of slots of the wireless communication system so that the priority level of a first slot, in which an uplink-slot timing and a downlink-slot timing overlap with the other wireless communication system, is lower than the priority level of a second slot, in which an uplink-slot timing and a downlink-slot timing do not overlap; and an allocation step of allocating resources to the slots of the wireless communication system according to the priority levels of the slots.

Description

[Technical field]

[0001] The present invention relates to a wireless communication method and a wireless communication system. [Background technology]

[0002] 2. Description of the Related Art In a TDD (Time Division Duplex) wireless communication system, a technique for suppressing interference between channels is known (see, for example, Patent Document 1).

[0003] In addition, in a local 5G (5th Generation) system, it is known that if the start timing of the radio frame or the communication patterns of the uplink and downlink do not match, interference occurs between the base station and the mobile station, resulting in a deterioration in communication quality (see, for example, non-patent document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-202428 A [Non-patent literature]

[0005] [Non-Patent Document 1] Qualcomm Japan, LLC, "Asynchronous operation of local 5G," March 16, 2020, Ministry of Internal Affairs and Communications, [Retrieved June 3, 1991], Internet<URL:https: / / www.soumu.go.jp / main_content / 000676472.pdf> Summary of the Invention [Problem to be solved by the invention]

[0006] In a TDD wireless communication system, the interference between uplink slots and downlink slots has a problem that the communication quality such as SINR (Signal to Interference plus Noise Ratio) characteristics is significantly deteriorated compared to the interference between uplink slots or between downlink slots.

[0007] The embodiments of the present invention have been made in consideration of the above problems, and reduce degradation of communication quality caused by interference between uplink slots and downlink slots in a TDD wireless communication system. [Means for solving the problem]

[0008] In order to solve the above problem, a wireless communication method according to an embodiment of the present invention includes: an acquisition step in which a TDD wireless communication system acquires a TDD configuration of another wireless communication system whose communication area may overlap; and a step of performing a first slot in which timings of uplink slots and downlink slots overlap with the other wireless communication system based on the acquired TDD configuration. Among them, the priority of a third slot in which the timing of an uplink slot of the wireless communication system overlaps with the timing of a downlink slot of the other wireless communication system, and the priority of a fourth slot in which the timing of a downlink slot of the wireless communication system overlaps with the timing of an uplink slot of the other wireless communication system The method includes a determination step of determining a priority of a slot of the wireless communication system so that the priority is lower than the priority of a second slot in which the timing of the uplink slot and the downlink slot do not overlap, and an allocation step of allocating resources to the slot of the wireless communication system in accordance with the priority of the slot. Effect of the Invention

[0009] According to an embodiment of the present invention, in a TDD wireless communication system, it is possible to reduce degradation of communication quality caused by interference between uplink slots and downlink slots. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating an example of a system configuration of a wireless communication system according to an embodiment of the present invention. [Figure 2A]FIG. 1 is a diagram for explaining a problem of the present embodiment. [Figure 2B] FIG. 2 is a diagram for explaining a problem of the present embodiment. [Diagram 3] FIG. 1 is a diagram for explaining an overview of the present embodiment. [Figure 4] FIG. 2 is a diagram illustrating an example of a functional configuration of a wireless communication system according to the present embodiment. [Diagram 5] 4 is a flowchart illustrating an example of a process of the wireless communication system according to the first embodiment. [Figure 6] 10 is a flowchart illustrating an example of a process of a wireless communication system according to a second embodiment. [Figure 7] 13 is a flowchart illustrating an example of a priority determination process according to a third embodiment. [Figure 8] FIG. 2 illustrates an example of a hardware configuration of a computer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention (the present embodiment) will be described with reference to the drawings. The embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] <System configuration> 1 is a diagram showing an example of a system configuration of a wireless communication system according to the present embodiment. The wireless communication system 1 is, for example, a wireless communication system of a TDD (Time Division Duplex) scheme such as 5G (5th Generation), and includes a control device 10, a radio resource control unit 100, a base station 110, a mobile station 112, and the like.

[0013] The control device 10 is a device that controls one or more base stations 110, or a system including multiple devices. The radio resource control unit 100 is, for example, included in the control device 10, and plays a role of centrally controlling allocation of radio resources of one or more base stations 110. The base station 110 communicates with one or more mobile stations 112, for example, by TDD wireless communication such as 5G. The mobile station 112 is, for example, a mobile radio station owned by a user or the like.

[0014] The control device 10 and the radio resource control unit 100 may be disposed near the base station 110, or may be disposed remotely via a network. The base station 110 and the control device 10 are desirably connected to each other so that they can communicate with each other by wired communication such as an optical transmission network. However, this is not limiting, and the base station 110 and the control device 10 may be connected to each other so that they can communicate with each other by wireless communication such as IAB (Integrated Access Backhaul) or Wigig.

[0015] The other wireless communication system 2 is an example of another wireless communication system whose communication area may overlap with that of the wireless communication system 1. The example of Fig. 1 shows that a part of a communication area 111 of a base station 110 of the wireless communication system 1 overlaps with a part of a communication area 121 of a base station 120 of the other wireless communication system 2.

[0016] (About the assignment) 2A and 2B are diagrams for explaining the problem of this embodiment. Non-Patent Document 1 shows that in local 5G, in two wireless communication systems whose communication areas may overlap, when the start timing of a wireless frame or the communication patterns of uplink and downlink do not match, interference occurs between a base station and a mobile station.

[0017] FIG. 2A shows an example of a TDD Uplink-Downlink configuration (hereinafter referred to as a TDD configuration) in the case where the start timing of a radio frame of a radio communication system 1 and the start timing of a radio frame of another radio communication system 2 differ from each other.

[0018] In the example of Fig. 2A, the wireless communication system 1 starts a wireless frame at time t01, and the other wireless communication system 2 starts a wireless frame at time t02, which is different from time t01. In addition, "D" in each wireless frame indicates a downlink slot, "U" indicates an uplink slot, and "S" indicates a special slot that includes a switching period from a downlink slot to an uplink slot. In addition, the numbers 1 to 20 indicate slot numbers.

[0019] In the example of FIG. 2A, the TDD configuration 201 of the wireless communication system 1 and the TDD configuration 202 of another wireless communication system 2 have the same communication patterns represented by “D”, “U”, and “S”, but the start timings do not match.

[0020] In this case, for example, it can be seen that the timing of the uplink slots of slot numbers 9, 10, 19, and 20 of the wireless communication system 1 at least partially overlaps with the timing of the downlink slots of slot numbers 6, 7, 16, and 17 of the other wireless communication system 2. Similarly, it can be seen that the timing of the downlink slots of slot numbers 11 and 12 of the wireless communication system 1 at least partially overlaps with the timing of the uplink slots of slot numbers 9 and 10 of the other wireless communication system 2.

[0021] FIG. 2B shows an example of a TDD configuration in which the communication pattern of the wireless communication system 1 and the communication pattern of the wireless frames of the other wireless communication system 2 are different.

[0022] 2B, the wireless communication system 1 starts a wireless frame at time t01, and the other wireless communication system 2 starts a wireless frame at time t02, which is the same as time t01. In other words, the wireless frame start timings of the wireless communication system 1 and the other wireless communication system 2 match. On the other hand, the TDD configuration 201 of the wireless communication system 1 and the TDD configuration 202 of the other wireless communication system 2 do not match in communication patterns represented by "D", "U", and "S".

[0023] In this case, for example, it can be seen that the timing of the uplink slots of slot numbers 9 and 10 of the wireless communication system 1 overlaps with the timing of the downlink slots of slot numbers 9 and 10 of the other wireless communication system 2. Similarly, it can be seen that the timing of the downlink slots of slot numbers 4, 5, 12, and 16 of the wireless communication system 1 overlaps with the timing of the uplink slots of slot numbers 4, 5, 12, and 16 of the other wireless communication system 2.

[0024] In this way, when the start timing of a radio frame or the communication patterns of uplink and downlink do not match between the radio communication system 1 and the other radio communication system 2, the timing of the uplink slots and the downlink slots overlap, causing interference. In the TDD radio communication system 1, the interference between the uplink slots and the downlink slots significantly deteriorates communication quality such as SINR characteristics, compared to the interference between uplink slots or between downlink slots.

[0025] In the case where uplink signals or downlink signals collide with each other, some degree of separation is possible if the SINR is taken into consideration during design. For example, in a 5G wireless communication system, the degradation of SINR in the case of collision between uplink signals or downlink signals can be reduced by orthogonalizing the reference signals or synchronization signals between the uplink signals or downlink signals.

[0026] On the other hand, when an uplink signal and a downlink signal collide, the degradation of the SINR cannot be reduced by the same method. In particular, the SINR at the mobile station 112 may be significantly degraded depending on the positional relationship of the mobile station 112.

[0027] Therefore, the wireless communication system 1 according to the present embodiment has a function of reducing the deterioration of communication quality caused by the occurrence of interference between the uplink slots and the downlink slots.

[0028] (Outline of this embodiment) Fig. 3 is a diagram for explaining an overview of this embodiment. Here, it is assumed that the other wireless communication system 2 is a wireless communication system whose clock is synchronized with that of the wireless communication system 1 and uses the same frequency band. It is also assumed that the wireless communication system 1 has a TDD configuration 301 as shown in Fig. 3, and the start time t0 of a wireless frame coincides with the start time of a wireless frame of the other wireless communication system 2.

[0029] The wireless communication system 1 according to this embodiment allocates wireless resources in the following procedure, for example. Step 1) The wireless communication system 1 acquires the TDD configuration 302 of another wireless communication system 2 whose communication area may overlap with the other wireless communication system 2. For example, the wireless communication system 1 acquires the TDD configuration 302 of the other wireless communication system 2 by snooping, manual input, or the like.

[0030] Step 2) The wireless communication system 1 extracts a slot (hereinafter referred to as a first slot) in which the timing of the uplink slot and the downlink slot overlaps, based on the acquired TDD configuration 302. The wireless communication system 1 also determines the priority of the slots of the wireless communication system 1 so that the priority of the first slot is lower than the priority of a slot (hereinafter referred to as a second slot) in which the timing of the uplink slot and the downlink slot do not overlap.

[0031] 3, for example, the timing of downlink slots with slot numbers 9, 10, 19, and 20 of the wireless communication system 1 overlaps with the timing of uplink slots with slot numbers 9, 10, 19, and 209 of the other wireless communication system 2. Therefore, the slots with slot numbers 9, 10, 19, and 20 become the first slots. On the other hand, the slots with slot numbers 1-8 and 11-18 of the wireless communication system 1 become the second slots because the timing of the uplink slots and downlink slots do not overlap.

[0032] In this case, the wireless communication system 1 determines the priority of each slot by lowering the priority of the first slot or increasing the priority of the second slot so that the priority of the first slot is lower and the priority of the second slot is lower.

[0033] Step 3) The wireless communication system 1 allocates resources to the slots of the wireless communication system 1 according to the determined priority of each slot. For example, the wireless communication system 1 allocates resources to packets with higher priority in descending order of priority.

[0034] The above procedure allows slots to be used in order of priority (slots where no interference occurs between uplink and downlink signals), thereby reducing the degradation of communication quality caused by interference between uplink and downlink slots.

[0035] <Functional configuration of wireless communication system> FIG. 4 is a diagram illustrating an example of a functional configuration of the wireless communication system according to the present embodiment.

[0036] (Functional configuration of the control device) The control device 10 has, for example, a computer configuration, and the computer executes a predetermined program to realize the radio resource control unit 100. Note that at least a part of the functions of the radio resource control unit 100 may be realized by hardware.

[0037] The radio resource control unit 100 executes steps 1 to 3 described in Fig. 3 to allocate resources to each slot of a radio frame of the radio communication system 1. The radio resource control unit 100 includes, for example, an acquisition unit 401, a priority determination unit 402, and a resource allocation unit 403 as shown in Fig. 4.

[0038] The acquisition unit 401 acquires the TDD configuration of another wireless communication system 2 whose communication area may overlap with the other wireless communication system 2. For example, the acquisition unit 401 controls the base station 110 to monitor radio waves 421 transmitted by the base station 120 of the other wireless communication system 2, and acquires the TDD configuration 302 of the other wireless communication system 2 as shown in FIG.

[0039] Alternatively, the acquisition unit 401 may acquire the TDD configuration 302 of another wireless communication system 2 acquired by an administrator or the like using an air monitor or the like, by manual input by the administrator or the like, or by data output from the air monitor, for example.

[0040] Furthermore, when the wireless communication system 1 and the other wireless communication system 2 share resource allocation information (when there is inter-base station coordination), the acquisition unit 401 acquires the resource allocation information from the other wireless communication system 2. This resource allocation information includes, for example, information on whether or not a slot in which the timing of an uplink slot and a downlink slot overlaps is scheduled to be used, priority, etc., and the TDD configuration, etc.

[0041] The priority determination unit 402 determines the priority of each slot of the wireless communication system 1 such that the priority of the first slot is lower than the priority of the second slot, based on the TDD configuration of the other wireless communication system 2 acquired by the acquisition unit 401. Here, as described above, the first slot is a slot whose uplink slot and downlink slot timing overlap with the other wireless communication system 2, and the second slot is a slot whose uplink slot and downlink slot timing do not overlap with the other wireless communication system 2.

[0042] For example, the priority determination unit 402 may determine the priority of each slot of the wireless communication system 1 by lowering the priority of the first slot by one step lower than the priority of the second slot, so that the priority of the first slot is lower than the priority of the second slot. Alternatively, the priority determination unit 402 may determine the priority of each slot of the wireless communication system 1 by raising the priority of the second slot by one step higher than the priority of the first slot, so that the priority of the first slot is lower than the priority of the second slot.

[0043] The first slot may include a slot (hereinafter referred to as a third slot) in which the timing of the uplink slot of the wireless communication system 1 overlaps with the timing of the downlink slot of the other wireless communication system 2. The first slot may also include a slot (hereinafter referred to as a fourth slot) in which the timing of the downlink slot of the wireless communication system 1 overlaps with the timing of the uplink slot of the other wireless communication system 2.

[0044] When the first slot includes a third slot and a fourth slot, the priority determination unit 402 may determine the priority of the third slot to be different from the priority of the fourth slot. For example, the priority determination unit 402 may determine the priority of the third slot to be higher than the priority of the fourth slot. Alternatively, the priority determination unit 402 may determine the priority of the third slot to be lower than the priority of the fourth slot.

[0045] The resource allocation unit 403 allocates resources to slots of the wireless communication system 1 according to the slot priorities determined by the priority determination unit 402. For example, the resource allocation unit 403 allocates resources to slots of higher priority in descending order of packet priority.

[0046] (Base station functional configuration) As shown in FIG. 4, the base station 110 includes, for example, a radio transmission / reception unit 411, a signal demodulation unit 412, and a signal generation unit 413.

[0047] The wireless transceiver 411 transmits and receives wireless signals to and from one or more mobile stations 112 based on a wireless communication standard such as 5G or a TDD system. Preferably, the wireless transceiver 411 receives wireless signals transmitted by a base station 120 of another wireless communication system 2, or transmits and receives wireless signals to and from the base station 120.

[0048] The signal demodulation unit 412 demodulates the radio signal received by the radio transmission / reception unit 411 to obtain data contained in the radio signal. The signal generation unit 413 generates a transmission signal in accordance with resource allocation from the radio resource control unit 100, and outputs the transmission signal to the radio transmission / reception unit 411.

[0049] With the above configuration, the base station 110 performs TDD wireless communication under the control of the control device 10.

[0050] The functional configuration of the wireless communication system 1 shown in Fig. 4 is an example. For example, in Fig. 4, a part or all of the acquisition unit 401 included in the wireless resource control unit 100 may be provided in the base station 110. Furthermore, at least a part of the acquisition unit 401, the priority determination unit 402, and the resource allocation unit 403 included in the wireless resource control unit 100 may be included in an apparatus other than the base station 110 and the control device 10 included in the wireless communication system 1. In short, the acquisition unit 401, the priority determination unit 402, and the resource allocation unit 403 only need to be included in the wireless communication system 1, and may be provided in any apparatus in the wireless communication system 1.

[0051] Moreover, the functional configuration shown in FIG. 4 indicates the functional configuration necessary for explaining this embodiment among various functional configurations included in the wireless communication system 1, and the base station 110 and the control device 10 may further have various functional configurations that are equipped in general base stations and control devices.

[0052] <Processing flow> Next, the process flow of the wireless communication method according to the present embodiment will be described by taking a number of examples as examples.

[0053] [Example 1] FIG. 5 is a flowchart illustrating an example of a process of the wireless communication system according to the first embodiment.

[0054] In step S501, the acquisition unit 401 of the wireless communication system 1 acquires the TDD configuration of another wireless communication system 2 whose communication area may overlap. For example, the acquisition unit 401 acquires the TDD configuration 302 of the other wireless communication system 2 as shown in FIG. 3 by snooping or manual input. When acquiring the TDD configuration 302 of the wireless communication system 2 by snooping, for example, the acquisition unit 401 may decode the MIB (Master Information Block) described in the PBCH (Physical Broadcast Channel) of the wireless communication system 2 and the DCI (Downlink Control Information) described in the PDCCH (Physical Downlink Control Channel) and the SIB1 (System Information Block Type1) described in the PDSCH (Physical Downlink Shared CHannel) to acquire the tdd-UL-DL-ConfigurationCommon. A dedicated UE_ID or the like may be determined in advance for sharing each message, and the message may be decoded using this. The message may be decoded by the UE of the wireless communication system 1, and the UE may notify the base station of the wireless communication system 1.

[0055] In step S502, the priority determination unit 402 of the wireless communication system 1 determines the priority of the slot by lowering the priority of a slot (first slot) in which uplink and downlink collide below the priority of a slot (second slot) in which uplink and downlink do not collide.

[0056] Here, as described above, the first slot is a slot whose uplink slot and downlink slot timing overlap with another wireless communication system 2, and the second slot is a slot whose uplink slot and downlink slot timing do not overlap with another wireless communication system 2.

[0057] 3, the priority determination unit 402 determines, for example, the priority of slots with slot numbers 9, 10, 19, and 20, in which the timing of the downlink slot of the wireless communication system 1 overlaps with the uplink slot of another wireless communication system 2, to be lower than the priority of other slots. Alternatively, the priority determination unit 402 may determine the priority of other slots (slot numbers 1-8 and 11-18) to be higher than the priority of slot numbers 9, 10, 19, and 20.

[0058] In step S503, the resource allocation unit 403 of the wireless communication system 1 allocates resources to slots with high slot priorities in descending order of packet priority.

[0059] 5, the wireless communication system 1 can effectively reduce the frequency of collisions (overlaps) between uplink and downlink signals, especially when the traffic of downlink signals is relatively low and the line utilization rate is low. This allows the wireless communication system 1 to reduce the number of retransmission processes and improve line utilization efficiency.

[0060] [Example 2] 6 is a flowchart showing an example of a process of a wireless communication system according to the embodiment 2. This process shows an example of a process in a case where a wireless communication system 1 shares a resource allocation status with another wireless communication system 2. Note that a detailed description of the process similar to that of the embodiment 1 will be omitted here.

[0061] In step S601, the acquisition unit 401 of the wireless communication system 1 acquires the TDD configuration and resource allocation information of another wireless communication system 2 whose communication area may overlap. For example, the acquisition unit 401 controls the base station 110 to transmit and receive resource allocation information (for example, whether or not there is a schedule for using resources where uplink and downlink conflict) to and from the base station 120 of the other wireless communication system 2. At this time, the TDD configuration of the other wireless communication system 2 may be included in the resource allocation information.

[0062] In step S602, the priority determination unit 402 of the wireless communication system 1, similar to the first embodiment, determines the priority of the slot by lowering the priority of the slot (first slot) in which the uplink and downlink collide below the priority of the slot (second slot) in which the uplink and downlink do not collide.

[0063] In step S603, the resource allocation unit 403 of the wireless communication system 1 allocates resources to slots with high slot priorities in the order of packet priority, similarly to the first embodiment.

[0064] In step S604, if the timing of a slot in which the other wireless communication system 2 transmits a high priority packet overlaps with the timing of a slot in which the wireless communication system 1 transmits a low priority packet, the resource allocation unit 403 cancels the transmission of the low priority packet. Here, the low priority packet is a packet having a lower priority than the high priority packet.

[0065] 5, the wireless communication system 1 can effectively reduce the frequency of collision (timing overlap) between uplink and downlink signals, especially when the traffic of the downlink signal is relatively low and the line utilization rate is low. Also, the wireless communication system 1 can reduce interference with high priority packets of other wireless communication systems 2 by canceling the transmission of low priority packets that overlap with a slot in which the other wireless communication system 2 transmits a high priority packet.

[0066] [Example 3] Fig. 7 is a flowchart showing an example of a priority determination process according to the third embodiment. This process shows another example of the priority determination process executed by the priority determination unit 402 in step S502 in Fig. 5 or step S602 in Fig. 6. The priority determination unit 402 executes the process shown in Fig. 7 for each slot of the wireless communication system 1, for example, in step S502 in Fig. 5 or step S602 in Fig. 6.

[0067] In step S701, the priority determination unit 402 judges whether the slot to be processed is a slot where uplink and downlink collide (a slot where the timing of the uplink slot and the timing of the downlink slot overlap). If it is a slot where uplink and downlink collide, the priority determination unit 402 shifts the process to step S702. On the other hand, if it is not a slot where uplink and downlink collide, the priority determination unit 402 ends the process of FIG. 7.

[0068] In step S702, the priority determination unit 402 judges whether the slot is an uplink slot or a downlink slot of the wireless communication system 1. For example, in Fig. 2B, the slots with slot numbers 4 and 5 are slots where uplink and downlink collide, and the slot of the wireless communication system 1 is "D", so the priority determination unit 402 judges that the slot is a downlink slot of the wireless communication system 1. On the other hand, in Fig. 2B, the slots with slot numbers 9 and 10 are slots where uplink and downlink collide, and the slot of the wireless communication system 1 is "U", so the priority determination unit 402 judges that the slot is an uplink slot of the wireless communication system 1.

[0069] If the slot is an uplink slot, the priority determination unit 402 shifts the process to step S703. On the other hand, if the slot is a downlink slot, the priority determination unit 402 shifts the process to step S704.

[0070] In step S703, priority determination unit 402 lowers the priority of the slot by one step below slots in which upstream and downstream do not collide, or in step S704, lowers the priority of the slot by two steps below slots in which upstream and downstream do not collide.

[0071] By the process of FIG. 7, the priority determination unit 402 can determine the priority of slots into three stages so that the priority of a slot in which there is no collision between the upstream and downstream is the highest, and among the slots in which there is collision between the upstream and downstream, the collision slot in which the downstream is the lowest priority.

[0072] 7 is an example. For example, the priority determination unit 402 may determine the priority of slots into three stages such that, among slots where uplink and downlink collide, the priority of the colliding slot where the uplink is the colliding slot is the lowest.

[0073] <Hardware configuration> The control device 10, the base station 110, the wireless communication system 1, and the like according to this embodiment include, for example, a hardware configuration of a computer 800 as shown in Fig. 8. Moreover, the wireless communication system 1 according to this embodiment realizes an acquisition unit 401, a priority determination unit 402, a resource allocation unit 403, and the like by causing one or more computers 800 to execute a program in which the processing contents of this embodiment are described.

[0074] The above program can be recorded in a computer-readable storage medium (such as a portable memory) and stored or distributed. The above program can also be provided via a network such as the Internet or e-mail.

[0075] Fig. 8 is a diagram showing an example of the hardware configuration of a computer 800. In the example of Fig. 8, a computer 800 includes a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus B, and the like.

[0076] The processor 1001 is, for example, an arithmetic device such as a CPU (Central Processing Unit) that realizes various functions by executing a predetermined program. The memory 1002 is a storage medium readable by the computer 800, and includes, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage device 1003 is a computer-readable storage medium, and may include, for example, a HDD (Hard Disk Drive), an SSD (Solid State Drive), various optical disks, and magneto-optical disks.

[0077] The communication device 1004 includes one or more hardware (transmission / reception devices) for communicating with other devices via a wireless or wired network. The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one (e.g., an input / output device such as a touch panel display).

[0078] The bus B is commonly connected to the above components and transmits, for example, address signals, data signals, and various control signals, etc. The processor 1001 may include, in addition to (or instead of) the CPU, for example, a DSP (Digital Signal Processor), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).

[0079] The above program may be for realizing part of the above-mentioned functions, and may further be capable of realizing the above-mentioned functions in combination with a program already recorded in the computer 800. Furthermore, part or all of the functions of the wireless communication system 1 may be realized using hardware such as a programmable logic device (PLD) or a field programmable gate array (FPGA).

[0080] <Effects of the embodiment> The wireless communication system 1 according to the present embodiment uses slots in order of priority (slots where uplink and downlink signals do not collide). Therefore, especially when the traffic of downlink signals is relatively low and the line utilization rate is low, the frequency of uplink and downlink signal collisions is reduced, the number of retransmission processes is reduced, and line utilization efficiency is improved.

[0081] 3, for example, if the duration of one slot is 1 ms, the downlink utilization rate of the wireless communication system 1 is 5 / 7 or less, and the downlink delay and jitter requirements allow for 2 ms or more, collision of uplink and downlink signals can be avoided. Alternatively, if the uplink utilization rate of the other wireless communication system 2 is 1 / 2 or less, and the delay and jitter requirements allow for 8 ms or more, collision of uplink and downlink signals can be avoided. Even if slots that are outside the above range and may cause collision of uplink and downlink signals are used, the probability of collision can be reduced by not using some slots.

[0082] As described above, according to the embodiments of the present invention, in a TDD wireless communication system, it is possible to reduce degradation of communication quality caused by interference between uplink slots and downlink slots.

[0083] <Summary of the embodiment> This specification discloses at least the following wireless communication methods and wireless communication systems. (Section 1) TDD wireless communication system, An acquisition step of acquiring a TDD configuration of another wireless communication system whose communication area may overlap; a determining step of determining a priority of a slot of the other wireless communication system based on the acquired TDD configuration such that a priority of a first slot, the timing of which overlaps an uplink slot and a downlink slot of the other wireless communication system, is lower than a priority of a second slot, the timing of which does not overlap an uplink slot and a downlink slot of the other wireless communication system; an allocation step of allocating resources to slots of the wireless communication system according to a priority of the slots; A wireless communication method comprising: (Section 2) the first slot includes a third slot in which an uplink slot of the wireless communication system and a downlink slot of the other wireless communication system overlap in timing, and a fourth slot in which a downlink slot of the wireless communication system and an uplink slot of the other wireless communication system overlap in timing, The determining step determines the priority of the third slot and the priority of the fourth slot to be different priorities. 2. A wireless communication method as set forth in claim 1. (Section 3) 3. The wireless communication method according to claim 1 or 2, wherein the allocating step allocates resources to slots having higher slot priorities in descending order of packet priority. (Section 4) The wireless communication method according to any one of claims 1 to 3, wherein the acquisition step acquires the TDD configuration of the other wireless communication system by snooping radio waves transmitted by the other wireless communication system. (Section 5) The acquiring step includes sharing resource allocation information with the other wireless communication system; the wireless communication system cancels transmission of a low priority packet when a timing of a slot in which the other wireless communication system transmits a high priority packet overlaps with a timing of a slot in which the wireless communication system transmits a low priority packet having a lower priority than the high priority packet. A wireless communication method according to any one of claims 1 to 3. (Section 6) The wireless communication method according to any one of paragraphs 1 to 5, wherein the other wireless communication system is a wireless communication system that is synchronized with the wireless communication system and uses the same frequency band. (Section 7) A TDD wireless communication system, An acquisition unit that acquires a TDD configuration of another wireless communication system whose communication area may overlap; a priority determination unit that determines a priority of a slot of the wireless communication system based on the acquired TDD configuration so that a priority of a first slot, the timing of which overlaps with an uplink slot and a downlink slot of the other wireless communication system, is lower than a priority of a second slot, the timing of which does not overlap with an uplink slot and a downlink slot of the other wireless communication system; a resource allocation unit that allocates resources to slots of the wireless communication system according to the priority of the slots; A wireless communication system comprising:

[0084] Although the present embodiment has been described above, the present invention is not limited to such a specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0085] 1. Wireless communication systems 2. Other wireless communication systems 111, 121 communication area 302 TDD Configuration 401 Acquisition Department 402 Priority determination section 403 Resource Allocation Department

Claims

1. A TDD wireless communication system includes: An acquisition step of acquiring a TDD configuration of another wireless communication system whose communication area may overlap; a determining step of determining, based on the acquired TDD configuration, a priority of a slot of the other wireless communication system, among a first slot in which the timing of an uplink slot and a downlink slot of the other wireless communication system overlaps, such that a priority of a third slot in which the timing of an uplink slot of the wireless communication system overlaps with a downlink slot of the other wireless communication system and a fourth slot in which the timing of a downlink slot of the wireless communication system overlaps with an uplink slot of the other wireless communication system are lower than a priority of a second slot in which the timing of an uplink slot and a downlink slot do not overlap; an allocation step of allocating resources to slots of the wireless communication system according to a priority of the slots; A wireless communication method comprising:

2. The determining step determines a priority of the third slot and a priority of the fourth slot to be different priorities. The wireless communication method according to claim 1 .

3. 3. The wireless communication method according to claim 1, wherein the allocating step allocates resources to slots having higher slot priorities in descending order of packet priority.

4. The wireless communication method according to claim 1 , wherein the acquiring step acquires the TDD configuration of the other wireless communication system by snooping radio waves transmitted by the other wireless communication system.

5. The acquiring step includes sharing resource allocation information with the other wireless communication system; the wireless communication system cancels transmission of a low priority packet when a timing of a slot in which the other wireless communication system transmits a high priority packet overlaps with a timing of a slot in which the wireless communication system transmits a low priority packet having a lower priority than the high priority packet. A wireless communication method according to any one of claims 1 to 3.

6. The wireless communication method according to claim 1 , wherein the other wireless communication system is a wireless communication system that is synchronized with the wireless communication system and uses the same frequency band as the wireless communication system.

7. A TDD wireless communication system, An acquisition unit that acquires a TDD configuration of another wireless communication system whose communication area may overlap; a priority determination unit that determines, based on the acquired TDD configuration, a priority of a third slot in which the timing of the uplink slot of the wireless communication system overlaps with the timing of the downlink slot of the other wireless communication system, and a priority of a fourth slot in which the timing of the downlink slot of the wireless communication system overlaps with the timing of the uplink slot of the other wireless communication system, so that the priority of the third slot is lower than a priority of a second slot in which the timing of the uplink slot is not overlapped with the timing of the downlink slot of the other wireless communication system; a resource allocation unit that allocates resources to slots of the wireless communication system according to the priority of the slots; A wireless communication system comprising:

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