WO2000019755A1 - Systeme de communication radio amrt; station de base et stations d'abonnes pour communication radio - Google Patents
Systeme de communication radio amrt; station de base et stations d'abonnes pour communication radio Download PDFInfo
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- WO2000019755A1 WO2000019755A1 PCT/JP1998/004391 JP9804391W WO0019755A1 WO 2000019755 A1 WO2000019755 A1 WO 2000019755A1 JP 9804391 W JP9804391 W JP 9804391W WO 0019755 A1 WO0019755 A1 WO 0019755A1
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- interference
- slot
- base station
- information
- station
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/04—Traffic adaptive resource partitioning
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
Definitions
- TDM A wireless communication system, base station apparatus and subscriber station for wireless communication
- the present invention relates to a method for avoiding interference in TDMA wireless communication.
- a certain number of (for example, seven) frequencies are repeatedly used to enable two-dimensional services.
- P-MP P0INTT PMULTI-POINT type
- the base station listens to all radio carriers allocated to it at the time of startup, and then determines the frequency to be used, measures the bit error rate of the received signal, etc., and measures for interference.
- a system that detects and retransmits interference packets and changes the communication channel is also used.
- the antenna directivity depends on the complexity of the terrain in the service area. There is a limit to avoiding interference by itself.
- fixed communication systems have a wider transmission band than mobile communication systems. To avoid interference by arranging many wireless carriers is not desirable from the viewpoint of effective use of frequency.
- the receiving side in a TDM line, cannot detect the existence of a channel for its own station before receiving, so even if interference occurs, it can receive it. It cannot be detected on the side.
- TDMA wireless communication system that performs reallocation control to change the number of allocated slots during communication and performs reallocation control to change slot allocation during communication
- the base The reliability of the control line for the meeting between the station and the subscriber station affects the performance of the entire system. For this reason, various measures have been taken, such as enhancing the error correction capability of the control line and transmitting the same data in multiple frames.
- various measures have been taken, such as enhancing the error correction capability of the control line and transmitting the same data in multiple frames.
- interference does not function effectively because interference occurs in a fixed and periodic manner.
- the present invention has been made to solve the above problems, and a TDMA communication system and a TDMA communication system capable of reallocating and relocating a communication slot between a base station and a subscriber station while avoiding interference.
- the purpose is to obtain a base station device and a subscriber station device that perform the above. Disclosure of the invention
- the present invention relates to a base station apparatus for performing TDMA wireless communication with a plurality of subscriber stations, and an interference slot database for registering and storing a communication slot in which interference has occurred, and each subscriber station corresponding to a change in traffic.
- a TDMA control unit that reassigns and relocates slots communicating with the subscriber station based on interference slot information based on the interference slot data, and interferes with predetermined slots received from the subscriber station.
- the interference slot information is detected, the interference slot information is registered in the interference slot database at the same time, the interference slot blocking information is transmitted to the subscriber station, and the registration information in the interference slot database is transmitted.
- the slot reassignment and relocation are performed based on the information, and the slot reassignment and relocation information is transmitted to each subscriber station to avoid interference that cannot be avoided due to the directivity of the antenna. Can, the installation conditions of the base stations can be significantly reduced.
- the present invention also relates to a TDMA wireless communication system in which a base station and a plurality of subscriber stations wirelessly communicate, wherein the base station includes an interference slot data base for registering and storing a communication slot in which interference has occurred.
- a TDMA control unit that performs reassignment and relocation of slots communicating with each subscriber station in response to traffic changes based on interference slot information of the interference slot database.
- the base station When detecting interference in a predetermined slot received from the base station, the base station transmits the interference slot information to the base station, and the base station receiving the interference slot information sets the interference slot information to the base of the interference slot.
- the slot reassignment / relocation is performed based on the registration information based on the interference slot data, and the slot reassignment / relocation information is transmitted to each subscriber station. , It is possible to avoid interference that can not be avoided in the directivity of the antenna.
- the present invention provides a method in which a base station and a plurality of subscriber stations perform uplink TDMA,
- This is a TDMA wireless communication system that performs wireless communication using the downlink TDM system.
- the base station is an interference slot data base that registers and stores the communication slot in which interference occurred, and each subscriber responds to changes in traffic.
- a TDMA control unit that performs reassignment and relocation of slots communicating with the station based on interference slot information based on interference slot data.
- Uplink TDMA slot reassignment '' Downlink TDM relocation information Transmitted to each subscriber station every predetermined frame on the line, and each subscriber station has the uplink TDMA slot re-allocation and relocation information addressed to its own station transmitted from the base station every predetermined frame.
- the base station which does not receive the signal, determines that interference has occurred and transmits the occurrence of the interference to the base station.
- the base station that has received the interference registers the interference occurrence information in the interference slot data base, and Interference slot night base By transmitting slot reassignment and relocation information to each subscriber station based on the registered information, it is not necessary to provide a special monitor circuit for TDM line interference detection, and interference can be detected easily. Can be
- the present invention is a TDMA wireless communication system in which a base station and a plurality of subscriber stations wirelessly communicate, wherein the slot allocation and arrangement of each subscriber station are changed simultaneously for each superframe of a TDMA frame.
- the base station transmits the next slot reassignment / relocation information to each subscriber station in a different slot arrangement in multiple frames within the superframe period, thereby allowing the base station to transmit the slot without being affected by interference.
- Relocation ⁇ Relocation information can be transmitted reliably.
- the present invention is a base station apparatus which divides a service area of its own station into a plurality of sectors and performs TDMA wireless communication with a plurality of subscriber stations, wherein an interference slot for registering and storing a communication slot in which interference has occurred.
- TDM that reassigns and relocates the slots that communicate with each subscriber station in response to traffic changes based on the interference slot data based on the interference slot data
- the TDMA control unit when performing slot reallocation / relocation, causes interference to occur in a subscriber station in a sector where interference does not occur, and then in a sector where interference occurs.
- the present invention can reduce the probability of occurrence of interference after reallocation / relocation by managing the interference slot information for each sector in the interference slot data pace.
- the present invention relates to a base station apparatus for performing TDMA wireless communication with a plurality of subscriber stations, wherein an interference slot data for registering and storing a communication slot in which interference occurs is provided.
- a TDMA control unit that performs reassignment and relocation of slots communicating with each subscriber station based on interference slot information based on interference slot data, and a predetermined slot received from the subscriber station.
- the interference slot information is registered in the interference slot data base
- the interference slot closing information is transmitted to the subscriber station
- the interference slot database is registered in the interference slot database.
- the slot reassignment and relocation are performed based on the registration information, and the slot reassignment and relocation information are transmitted to each subscriber station. In this case, by canceling the registration of the interference slot information registered on the interference slot data base, it is possible to avoid the interference that cannot be avoided due to the directivity of the antenna, and to remove the interference slot information. Resources can be reallocated and relocated effectively.
- the present invention has an interference erroneous detection data base, and registers interference slot information deregistered from the interference slot data base in the interference erroneous detection data base, thereby eliminating interference.
- the allocated slots can be used effectively for reallocation and reallocation.
- the present invention transmits an abnormality to a central station that manages a base station when the same interference slot information is registered in the interference error detection database in a predetermined number or more within a predetermined period, thereby preventing equipment failure, An unexpected failure can be detected at an early stage and can be dealt with.
- the present invention increases the interference determination threshold value for detecting interference when the same interference slot information is registered in the interference erroneous detection data base more than a specified number within a certain period of time. It is possible to avoid erroneous detection due to temporary deterioration in communication quality, and prevent a reduction in line capacity.
- the present invention also relates to a TDMA wireless communication system in which a base station and a plurality of subscriber stations wirelessly communicate, wherein the base station includes an interference slot data base for registering and storing a communication slot in which interference has occurred.
- a TDMA control unit that performs reassignment and relocation of slots communicating with each subscriber station in response to traffic changes based on interference slot information of the interference slot database. Transmits interference slot information to the base station upon detecting interference in a predetermined slot received from the base station, and the base station receiving the interference slot information transmits the interference slot information to the interference slot.
- slot reassignment / relocation is performed based on the registration information based on the interference slot data, and slot reassignment / relocation information is transmitted to each subscriber station.
- An instruction signal for causing the subscriber station to receive the interference slot for a certain period of time is transmitted, and the subscriber station receiving the instruction signal receives the interference slot for a certain period of time, and when the interference disappears,
- By transmitting a request to delete the interference slot information registered in the interference slot data base to the base station it is possible to avoid interference that cannot be avoided due to the directivity of the antenna, and In addition, the slot where the interference has disappeared can be effectively used for reallocation and reallocation.
- the present invention provides a base station or a subscriber station that has a database for false detection of interference.
- the interference slot information that has been deregistered from the interference throttling data base in the interference misdetection data base, the slot in which the interference has disappeared can be used effectively for reallocation and relocation. it can.
- the present invention transmits an abnormality to a central station that manages a base station when the same interference slot information is registered in the interference error detection database in a predetermined number or more within a predetermined period, thereby preventing equipment failure, An unexpected failure can be detected at an early stage and can be dealt with.
- the present invention increases the interference determination threshold value for detecting interference when the same interference slot information is registered in the interference erroneous detection database more than a specified number within a predetermined period, thereby temporarily It can avoid erroneous detection due to excessive deterioration in communication quality, and can prevent a decrease in line capacity.
- the present invention relates to a subscriber station apparatus for performing TDMA wireless communication with a base station, wherein when interference is detected in a predetermined slot received from the base station, interference slot information is transmitted to the base station, Time When the interference slot is received and the interference disappears, the interference can be avoided by transmitting the interference disappearance information to the base station, and the slot in which the interference has disappeared can be reallocated and reassigned. It can be effectively used for placement.
- FIG. 1 is a diagram showing a TDMA wireless communication system according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing a TDMA wireless communication system according to Embodiment 2 of the present invention.
- FIG. 3 is a diagram showing a frame configuration used for a TDMA wireless communication system according to Embodiment 2 of the present invention.
- FIG. 4 shows a TDMA wireless communication system according to Embodiment 3 of the present invention.
- FIG. 3 is a diagram showing a frame configuration to be used.
- FIG. 5 is a diagram showing a TDMA wireless communication system according to Embodiment 4 of the present invention.
- FIG. 6 is a diagram showing a TDMA wireless communication system according to Embodiment 5 of the present invention.
- FIG. 7 is a diagram showing a TDMA wireless communication system according to Embodiment 6 of the present invention.
- FIG. 8 is a diagram showing a TDMA wireless communication system according to Embodiment 7 of the present invention.
- FIG. 9 is a diagram showing a TDMA wireless communication system according to Embodiment 8 of the present invention.
- FIG. 10 is a diagram showing a TDMA wireless communication system according to Embodiment 9 of the present invention.
- FIG. 11 is a diagram showing a TDMA wireless communication system according to Embodiment 10 of the present invention.
- FIG. 1 is a diagram showing Embodiment 1 according to the present invention.
- the base station 1 is communicating with each of the subscriber stations 21 to 24 in its own service area 91 by the TDMA / TDD method.
- Numeral 6 1 denotes a downlink for communicating with the subscriber station 21, and
- numeral 71 denotes an uplink.
- These base station 1 and each subscriber station 2 1 to 24 The upper and lower lines correspond to traffic changes by the TDMA control unit of the base station 1 and perform re-allocation control that periodically changes the number of allocated slots and change the slot arrangement during a call. Relocation control is performed so that communication with optimal frame use efficiency can be realized with each of the subscriber stations 21 to 24 according to the state at that time.
- base station 11 installed at a predetermined distance from base station 1 is communicating with a subscriber station in its own service area 92 using the same frequency as base station 1. It is assumed that the radio wave transmitted by the base station 11 interferes with the communication of the uplink 71 between the base station 1 and the subscriber station 21 as an interference wave 51. As a result, in the TDMA frame 311 of the base station 1, as shown in the figure, a part of the slot 411 allocated to the uplink 7 1 with the subscriber station 2 1 1 disables reception.
- the base station 1 detects this interference by comparing the bit error rate of the received signal and the received electric field strength with the threshold for interference determination, and registers the interference slot information in the interference slot database 101. .
- the TDMA control unit of base station 1 plans slot reassignment based on the communication request information sent from subscriber stations 21 to 24 during a fixed frame period, and at the same time, allocates the number of slots assigned to each line. Based on the interference slot information registered in the interference slot database 101, a slot relocation plan that maximizes the frame use efficiency without using the interference slot is planned. The assigned / relocated slot information is reported to each subscriber station 21 to 24 using the downlink 61 during the period up to the frame immediately before the TDMA frame 312. Then, communication starts with a slot arrangement newer than TDMA frame 312.
- the TDMA frame 312 is a predetermined slot reassignment / relocation change timing regardless of the presence or absence of interference, and the TDMA control unit refers to the interference slot data 101 As a result, interference slots are avoided in addition to the usual slot reassignment and reallocation.
- the uplink 71 receiving the interference is divided into two uplinks 71 1 and 71 2 in order to avoid the interference slot 51.
- the uplinks 7 1 1 and 7 1 2 are not necessarily divided into a plurality of May be rearranged.
- the subscriber station 21 detects interference based on the bit error rate of the received signal and the received electric field strength, and passes the interference slot 4 22 through the uplink line 7 1. Notify base station 1.
- the base station 1 having received the notification of the occurrence of the interference from the subscriber station 21 registers the interference slot information in the interference slot data base 101.
- the TDMA control unit of the base station 1 refers to the interference slot database 101 to plan slot reassignment and relocation to avoid the interference slot, By notifying each subscriber station 21 to 24, communication is started in the new slot arrangement from TDMA frame 325, so that the influence of interference wave 52 from base station 11 is avoided. Will be.
- the slot reassignment / relocation information is notified to each of the subscriber stations 21 to 24 using the downlink 61 during the period up to the frame immediately before the TDMA frame 325.
- the base station 1 reassigns the slot to the subscriber station 21 1.
- a dedicated downlink line 62 for transmitting the information may be newly set.
- base station 1 sets up a new line using the broadcast channel.
- a spare slot may be set in advance between the base station 1 and the subscriber stations 21 to 24 in preparation for occurrence of interference.
- TDM method is used for the downlink, no special communication is required for line setting.
- FIG. 2 is a diagram showing a second embodiment according to the present invention.
- the base station 1 is performing communication with each of the subscriber stations 21 to 24 in its own service area 91 by the uplink TDMA and the downlink TDM.
- Reference numeral 61 denotes a downlink for communicating with the subscriber station 21 and 71 denotes an uplink.
- the upper and lower lines between the base station 1 and each of the subscriber stations 21-24 correspond to changes in traffic by the TDMA control unit of the base station 1, and each of the lines is periodically changed during a call. Reallocation control to change the number of allocated slots and reallocation control to change the slot allocation are performed.
- Fig. 3 is a diagram showing the configuration of the downlink TDM line according to the present embodiment, which is required between base station 1 and subscriber station 21-24 for slot reassignment and relocation control. Is performed using a part of the TDM channel allocated to each subscriber 21-24.
- reference numeral 422 denotes a TDMA channel of the subscriber station 21, which comprises a subscriber ID 422 1, control information 422 2, and user data 4223.
- each downlink TDM frame has an uplink TDMA slot of subscriber stations 21 to 24. Packet reassignment and relocation information are transmitted as part of each user data.
- a base station 11 located at a predetermined distance from the base station 1 is communicating with a subscriber station in its own service area 92 using the same frequency as the base station 1. It is assumed that the radio wave transmitted by 1 interferes with the communication of the downlink 61 between the base station 1 and the subscriber station 21 as an interference wave 52. As a result, in the downlink TDM channel 42 between the base station 1 and the subscriber station 21, as shown in FIGS. 2 and 3, a part of the slot Thus, the subscriber station 21 cannot recognize the TDM channel 4 222 addressed to itself in this TDM frame 3 2 1. Therefore, the subscriber station 21 may not receive the uplink TDMA slot reassignment and relocation information in the TDM frame 321, which should have been notified from the base station 1 every frame. Recognize and notify this to base station 1 via uplink 7 1.
- the base station 1 that has received the notification of the occurrence of the interference from the subscriber station 21 registers the interference slot information on the corresponding TDM channel in the interference slot 101 at night.
- the TDMA control unit of base station 1 plans slot re-allocation based on communication request information sent from subscriber stations 21 to 24 during a certain frame period, and simultaneously allocates the number of allocated slots for each line.
- a slot relocation plan that maximizes the frame use efficiency is performed.
- the communication starts with a new slot arrangement that does not use the interference slot from TDM frame 323, so that the influence of interference wave 52 from base station 11 is avoided. Will be.
- the slot reassignment and relocation information is transmitted to each subscriber station 21 to 24 using the downlink 61 during the period up to the frame immediately before the TDM frame 323.
- the base station 1 reallocates the slot to the subscriber station 21 and reallocates it.
- a dedicated downlink 62 for transmitting the information of the communication may be newly set, but in this embodiment, since the TDM method is used for the downlink, a special communication for setting the line is required. Is not required.
- FIG. 4 is a diagram showing a third embodiment according to the present invention.
- information on slot reassignment and relocation from base station 1 is transmitted from TDMA frame 321, which is immediately after the slot allocation simultaneous change, to the next slot west station.
- TDMA frame 321 which is immediately after the slot allocation simultaneous change
- downlinks 6 1 1 to 6 13 and downlinks 6 2 1 to 6 2 3 with different slot arrangements are used. It is notified to each subscriber station.
- the slot reassignment / relocation information for the subscriber station 21 is not delivered. However, in the latter half of the frame, the information is transmitted in the slot 61 of the downlink to the subscriber station 21. Is possible.
- the timing for switching the combination of downlinks from 6 1 1 to 6 13 to 6 2 1 to 6 2 3 may be decided in advance between the base station 1 and the subscriber stations 2 1 to 24.
- the base station 1 may notify each of the subscriber stations 21 to 24 using the broadcast channel of each frame.
- the base station can assign an arbitrary slot arrangement. Embodiment 4.
- FIG. 5 is a diagram showing a fourth embodiment according to the present invention.
- base station 1 divides its own service provider into a plurality of sectors 911 to 916, and time-divisions directional antennas 11 to 11 covering the respective sectors. It communicates with the subscriber stations 21 to 24 while switching to.
- the base station 1 and the subscriber stations 21 to 24 are communicating with each other.
- the uplink 71 of the subscriber station 21 and the uplink 72 of the subscriber station 22 are: It is assumed that interference is being caused by radio waves 5 2 1 and 5 2 2 from the base stations 1 1 and 1 2 of the other service areas 9 2 1 and 9 2 2.
- the interference slot data base 101 of the base station 1 manages the interference slot for each antenna sector and each subscriber station as shown in FIG.
- the base station 1 When performing slot reassignment / relocation to each of the subscriber stations 21 to 24, the base station 1 first has no interference in the sector, and then has no interference in the same sector. Assign preferentially to subscriber stations. This can reduce the probability of interference recurrence.
- Embodiment 5 Embodiment 5
- FIG. 6 is a diagram showing a fifth embodiment relating to the present invention.
- the radio wave transmitted by the base station 11 interferes with the slot 4 1 1 assigned to the uplink 7 1 between the base station 1 and the subscriber station 2 1 as an interference wave 5 1.
- the base station 1 detects the interference, closes the slot by registering the slot 411 in the interference slot database 101, and closes the uplink 71 1 to the slots 4 1 2 and 4 1. 3 and communicates with the subscriber station 21 while receiving the blocked slot 4 11 for a certain period of time. Detects the presence or absence of an interference wave to the unit. ⁇
- the base station 1 sets the interference slot data from the slot 101 to the corresponding slot 4 1
- the blockage is released by deleting the registration of 1.
- the slot 411 can be assigned to the uplink 71 again.
- slot 4 11 may be assigned to a line other than uplink line 71.
- FIG. 7 is a diagram showing a sixth embodiment relating to the present invention.
- the subscriber station 21 detects the interference 52 in the slot 4 21 assigned to the downlink 6 1, so the base station 1 is notified that the interference is detected in the slot 4 21. Notify on uplink 7 1.
- the TDMA control unit of the base station 1 registers the slot 421 in the interference slot data base 101, blocks the slot, and relocates the downlink 61 to the slot 422. Make a plan.
- the base station 1 notifies the subscriber station 21 of the slot reassignment / relocation via the downlink 61 and receives the blocked slot 4 21 for a certain period of time.
- An instruction to detect the presence or absence of an interference wave to 1 is sent.
- the notification may be transmitted using the control line 62 in order to ensure the reliability of the downlink, as described in the previous embodiment.
- the base station 1 that has received the slot block release request releases the block by deleting the registration of the slot 421 from the interference slot data base 101.
- the slot 421 can be assigned to the downlink 63 with another subscriber station 22.
- the slot 4 21 may be allocated to the original downlink 61.
- FIG. 8 is a diagram showing a seventh embodiment relating to the present invention.
- the base station 1 has an interference slot data base 1 and a false interference detection data base 102.
- the base station 1 and its own station and the subscriber station 21 in its own service area 91 register the detected interference slot information in the interference slot database 101, and the base station 1 Slot reassignment ⁇ When relocating, the interference slot is excluded from assignment targets and closed.
- the base station 1 detects the interference, listens to the blocked slot for a certain period of time, and detects the presence or absence of an interference wave. If the interference wave could not be detected, or if the interference wave once detected disappears thereafter, delete the information of the slot from the interference slot data base 101 and release the blockage. At the same time, the slot information is registered in the interference error detection data base 102.
- the base station 1 As a result of detecting the interference, the subscriber station listens to the blocked slot for a certain period of time to detect the presence or absence of an interference wave.
- the subscriber station 21 registers the slot information in its own false interference detection database 202 when the interference wave cannot be detected or the once detected interference wave disappears thereafter. At the same time, it notifies base station 1 that no interference wave was detected.
- the base station 1 Upon receiving from the subscriber station 21 that the interference wave could not be detected, the base station 1 deletes the information on the interference slot from the interference slot data base 101 and releases the blockage.
- the subscriber station 21 is also provided with an erroneous interference detection data base.
- the information on the erroneous interference detection at the subscriber station 21 is also based on the erroneous interference detection data at the base station 1. It may be registered and managed centrally on the overnight base 102.
- the base station 1 periodically monitors the information of the false interference detection database 102, and if the number of false false detections for a given period exceeds the standard, the base station 1 sends the information to the central control station 81 via the backbone line 8. Notice. Also, if the subscriber station 21 has its own interference error detection data recovery pace 202, the subscriber station 21 monitors the information of the interference error detection database and detects its own interference error every fixed period. If the number of detections exceeds the reference, the base station 1 is notified of the deterioration of the false interference detection rate. The base station 1 that has received the notification of the interference error detection rate degradation from the subscriber station 21 notifies the central control station 81 via the backbone line 8. As a result, it is possible to detect the failure of the device or the occurrence of the failure at an early stage. Embodiment 8
- FIG. 9 is a diagram showing an eighth embodiment according to the present invention.
- base station 1 is the interference slot database 101, and Has an erroneous interference detection data pace 102.
- the base station 1 registers the interference slot information detected by the base station in the interference slot data base 101, and determines whether the interference slot is to be allocated at the time of slot reassignment / relocation for each line. And exclude it.
- the base station 1 detects interference by itself, listens to the blocked slot, and detects the presence or absence of an interference wave. If the interference wave cannot be detected, or if the detected interference wave disappears once, the information of the slot is deleted from the interference slot 101 and the blockage is released. Then, the information of the slot concerned is registered in the data base for interference error detection 102.
- the information of the interference misdetection database 102 of the base station 1 is reset at each time managed by the timer 103, by judging the number of misdetections.
- the base station 1 operates to lower the probability of erroneous interference detection by increasing the threshold value of its own interference detection means. If the erroneous detection probability does not decrease even if the threshold is raised to the upper limit, it is determined that the line is abnormal 104, and an alarm is issued to the central control station via the backbone line. That is, erroneous detection due to temporary deterioration of communication quality such as fluctuation of space propagation loss can be prevented by raising the threshold value of the interference detection means. If it does not decrease, an alarm is issued because some kind of failure or failure is expected.
- FIG. 10 is a diagram showing a ninth embodiment according to the present invention.
- the base station 1 has an interference slot data base 101 and an erroneous interference detection database 102.
- the base station 1 detects an interference signal detected by the subscriber station 2 in the service area of the base station 1 and notified via the uplink 71.
- the slot information is registered in the interference slot data base 101, and when slot reassignment / relocation to each line is performed, the interference slot is excluded from the assignment target and closed.
- the base station 1 causes the subscriber station 2 to listen to the blocked slot for a certain period of time to detect the presence or absence of an interference wave. If the interference wave cannot be detected, or if the once detected interference wave disappears, the subscriber station 2 notifies the base station 1 that the interference wave could not be detected. In response to this, the base station 1 deletes the information of the interference slot from the interference slot 101 and releases the blockage, and at the same time, releases the information of the slot into the interference detection database 102. Register information. The information of the base station 1 for the interference detection error of the base station 1 is determined at each time managed by the timer 103, and the number of detection errors is determined and reset.
- the base station 1 determines that the number of erroneous detections of the subscriber station 2 exceeds the standard, the base station 1 instructs the subscriber station 2 to increase the threshold value of the interference detection means. If the erroneous detection probability does not decrease even if the threshold value of the subscriber station 2 is raised to the upper limit, it is determined that the line is abnormal 104 and an alarm is issued to the central control station via the backbone line.
- the subscriber station 2 In response to a request to change the threshold from the base station 1, the subscriber station 2 responds to the request and, at the same time, activates its own timer 203 to reset the threshold after a certain period of time. You may do. As a result, the base station 1 does not need to manage the interference detection thresholds of all the subscriber stations, and the processing load on the base station 1 can be reduced.
- Embodiment 10
- FIG. 11 is a diagram showing an embodiment 10 according to the present invention.
- base station 1 is an interference slot data base 101, and In the figure, there is an error detection table 102.
- the base station 1 registers the interference slot information detected by the subscriber station 2 in the service area of the base station 1 and notified via the uplink 71 to the interference slot data base 101, and registers each line. Reassigning and relocating the slot to the target. When relocating, remove the interference slot from the allocation target and close it.
- the subscriber station 2 listens to the slot blocked by the base station 1 for a certain period of time according to the notification from the own station, and detects the presence or absence of an interference wave. If the interference wave cannot be detected, or if the once detected interference wave subsequently disappears, the subscriber station 2 stores the information of the interference slot in its own interference erroneous detection data base 202. At the same time, a request to release the blocking of the interference slot is transmitted to base station 1. In response to this, the base station 1 deletes the information of the interference slot from the interference slot database 101 and releases the blockage. At this time, the base station 1 may register the information of the slot in its own base station for interference detection error 102.
- the information of the interference error detection database 202 of the subscriber station 2 is determined and reset at each time managed by the timer 204 at each time.
- the subscriber station 2 controls to increase the threshold value of the interference detecting means of the own station.
- the threshold value of the interference detection may be controlled to return to the original value after a predetermined time by the timer 203 of the self.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1998/004391 WO2000019755A1 (fr) | 1998-09-30 | 1998-09-30 | Systeme de communication radio amrt; station de base et stations d'abonnes pour communication radio |
US09/529,440 US6930993B1 (en) | 1998-09-30 | 1998-09-30 | TDMA radio communication system, and a base station and subscriber stations for radio communication |
JP55025999A JP3397328B2 (ja) | 1998-09-30 | 1998-09-30 | Tdma無線通信方式並びに無線通信を行う基地局装置及び加入者局装置 |
EP98945522A EP1035742A4 (en) | 1998-09-30 | 1998-09-30 | AMRT RADIO COMMUNICATION SYSTEM; BASE STATION AND SUBSCRIBER STATIONS FOR RADIO COMMUNICATION |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1998/004391 WO2000019755A1 (fr) | 1998-09-30 | 1998-09-30 | Systeme de communication radio amrt; station de base et stations d'abonnes pour communication radio |
Publications (1)
Publication Number | Publication Date |
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WO2000019755A1 true WO2000019755A1 (fr) | 2000-04-06 |
Family
ID=14209109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1998/004391 WO2000019755A1 (fr) | 1998-09-30 | 1998-09-30 | Systeme de communication radio amrt; station de base et stations d'abonnes pour communication radio |
Country Status (4)
Country | Link |
---|---|
US (1) | US6930993B1 (ja) |
EP (1) | EP1035742A4 (ja) |
JP (1) | JP3397328B2 (ja) |
WO (1) | WO2000019755A1 (ja) |
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WO2003032670A1 (fr) * | 2001-10-03 | 2003-04-17 | Sharp Kabushiki Kaisha | Dispositif de communication radio |
JP2007529915A (ja) * | 2003-12-19 | 2007-10-25 | アイビス・テレコム・インコーポレイテッド | タイムスロットリソース管理による基地局の干渉制御 |
Also Published As
Publication number | Publication date |
---|---|
EP1035742A1 (en) | 2000-09-13 |
EP1035742A4 (en) | 2005-09-14 |
US6930993B1 (en) | 2005-08-16 |
JP3397328B2 (ja) | 2003-04-14 |
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