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WO1999037110A1 - Systeme de communication mobile amrt - Google Patents

Systeme de communication mobile amrt Download PDF

Info

Publication number
WO1999037110A1
WO1999037110A1 PCT/JP1999/000085 JP9900085W WO9937110A1 WO 1999037110 A1 WO1999037110 A1 WO 1999037110A1 JP 9900085 W JP9900085 W JP 9900085W WO 9937110 A1 WO9937110 A1 WO 9937110A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
time slot
radio base
mobile communication
shared
Prior art date
Application number
PCT/JP1999/000085
Other languages
English (en)
Japanese (ja)
Inventor
Shuichi Miyazaki
Hiroshi Usami
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Publication of WO1999037110A1 publication Critical patent/WO1999037110A1/fr

Links

Classifications

    • 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
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing

Definitions

  • the present invention relates to a mobile communication system using a TDMAC Time Division Multiple Access (TDMAC) method, and more particularly to traffic control when sharing a radio frequency between different radio communication areas.
  • TDMAC Time Division Multiple Access
  • the same occupied radio frequency is repeatedly allocated between different cells in order to increase the frequency utilization efficiency of the entire system.
  • FIG. 10 shows an example of a 7-cell repetition pattern in which 7 waves on the occupied radio frequency are allocated in repetition units.
  • measures have been taken by adding another occupied radio frequency to one cell. That is, two occupied radio frequencies are fixedly assigned to one cell.
  • an occupied radio frequency is assigned so that the base stations do not interfere with each other. For example, f8 which does not interfere with fl to f7 is assigned to the cell fl in FIG.
  • Traffic may be concentrated in a specific cell due to a sudden increase in new subscribers or events.
  • the traffic capacity is increased by increasing the occupied radio frequency allocated to each cell in the service provider.
  • one occupied frequency is allocated to several slots.
  • the purpose of the present invention is to appropriately increase the time-out at each base station according to the increase in traffic even when traffic is concentrated on a specific cell due to a sudden increase in new subscribers or events. By doing so, the resources can be used effectively. Disclosure of the invention
  • the present invention divides a service area into a plurality of cells.
  • a TDMA mobile communication system including a radio base station arranged at least one in the cell and a base station controller controlling the radio base station, radios that do not overlap between adjacent cells
  • a frequency is fixedly allocated to the radio base station, and the radio base station calculates a utilization rate of a time slot of the occupied frequency allocated to the radio base station, and calculates the calculated time slot utilization rate by:
  • the base station controller transmits to the base station controller, and the base station controller compares the time slot utilization rate received from each radio base station with a threshold value. It is characterized in that at least one of the time slots of the shared radio frequency shared by a plurality of cells is supplemented to the radio base station determined to require the allocation of the mouth.
  • the time slot utilization rate is determined based on a time slot of an occupied frequency assigned to the radio base station. It is characterized in that it is calculated based on the ratio of those used for mobile stations that communicate with.
  • the present invention is characterized in that the base station control device has a database that stores an identifier indicating the radio base station and a time slot utilization rate corresponding to the radio base station. .
  • the present invention fixedly assigns an occupied frequency that does not overlap between adjacent cells to the radio base station, and the radio base station reduces the time slot of the occupied frequency assigned to itself. Calculating a utilization rate, transmitting the calculated time slot utilization rate to the base station controller, the base station controller based on the respective time slot utilization rates received from the plurality of radio base stations, The wireless base station is supplemented with a time slot of a shared radio frequency shared by a plurality of cells. Further, according to the present invention, in order to solve the above-mentioned problems, the base station control device is configured to reduce a time slot of the shared radio frequency in proportion to a time slot utilization rate received from each of the plurality of radio base stations.
  • a radio base station calculates a time slot utilization rate of a shared radio frequency allocated to the radio base station, and calculates a time slot utilization of the calculated shared radio frequency.
  • the base station controller compares the time slot utilization rate of the shared radio frequency received from each radio base station with a threshold value, and further transmits a time slot of the shared radio frequency. If it is determined that allocation of a slot is necessary, at least one of the time slots of another shared radio frequency is supplemented to the radio base station.
  • FIG. 1 is a diagram showing an embodiment of a network configuration according to the present invention.
  • FIG. 2 is a diagram showing a configuration example of a base station control device according to the present invention.
  • FIG. 3 is a diagram showing a configuration example of a mobile station according to the present invention.
  • FIG. 4 is a diagram showing a configuration example of a base station according to the present invention.
  • FIG. 6 is a flowchart for explaining a time slot allocation method according to the present invention.
  • FIG. 7 is a diagram showing a time slot management table of occupied radio frequencies according to the present invention.
  • FIG. 8 is a diagram showing a time slot management table of a shared radio frequency according to the present invention.
  • FIG. 9 is a diagram showing the relationship between the number of time slots and the number of radio frequencies when the present invention is applied.
  • FIG. 10 is a diagram showing an example of a 7-cell repetition pattern in which seven waves on an occupied radio frequency are allocated in a repetition unit.
  • FIG. 11 shows the frequency allocation according to the present invention. It is a figure showing an application example.
  • FIG. 12 is a diagram showing the relationship between the traffic capacity and the number of occupied radio frequencies in the case of the 6-multiplex TDMA system. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 11 is a diagram showing an example of frequency allocation according to the present invention.
  • Fi indicates the occupied radio frequency band
  • FXj indicates the shared radio frequency band.
  • the occupied radio frequency band refers to a group of occupied radio frequencies, and most of them are a group of radio frequencies fixedly assigned when the base station is installed. Also does not change its assignment.
  • a shared radio frequency band refers to a group of shared radio frequencies, and a shared radio frequency refers to a frequency that is commonly allocated among a plurality of cells. Is also good.
  • this shared radio frequency is divided into, for example, 64 time slots and the like, and this time slot is shared between adjacent cells according to the traffic.
  • FIG. 1 is a diagram showing a network configuration according to the present invention.
  • cells 110, 111, and 112 indicate cells (wireless communication areas) formed by the base stations 102, 103, and 104, respectively.
  • Each cell is assigned a frequency so that they do not interfere with each other.
  • the mobile stations 105 to 109 when present in an arbitrary cell, communicate with the base station forming this cell through a time slot on the occupied radio frequency. There is no time slot on the occupied radio frequency In this case, communication is performed using the time slot on the shared radio frequency. In other words, by allocating the vacant time slot of the shared radio frequency to the base station where traffic is concentrated and there is no vacant time slot on the occupied radio frequency, the occurrence of the vacant time slot is minimized. It is possible to increase the traffic capacity.
  • the shared radio frequency fxj is shared by three base stations in the embodiment shown in FIG. 1, it may be shared by more base stations. Alternatively, a plurality of shared radio frequencies may be prepared and used repeatedly in the system by the service provider.
  • connection between the base stations 102 to 104 and the base station controller 101 is star-shaped with respect to the digital transmission line 114, but it is apparent that the connection can be applied to other connection forms such as a bus-shaped connection. It is.
  • the transmission clock between the base stations 102 to 104 and the base station controller 101 is synchronized with one of the digital transmission lines 114.
  • the base station control apparatus 101 manages several base stations, that is, cells 110 to 112 formed by the base stations 102 to 104 collectively.
  • the cell unit managed by the base station controller 101 is called a group cell 113 here.
  • the number of cells to be managed as the group cell 113 is determined when the base station is arranged (at the time of designing the station), taking into account the topography, population density, etc. of the area forming the cell.
  • FIG. 2 is a diagram showing a configuration example of the base station control device 101.
  • the base station control device 101 includes a communication processing unit 200 and a control unit 201.
  • the base station control device 101 includes a communication processing unit 200 and a control unit 201.
  • FIG. 2 for the sake of explanation, only base stations 102 and 103 are shown, and other base stations are omitted.
  • the communication processing unit 200 has a multiplex processing unit 201 that processes communication information from each of the base stations 102 to 104, and an interface unit 203 that transmits communication information to the mobile switching network via the digital transmission path 115. .
  • FIG. 3 is a diagram showing a configuration example of a mobile station.
  • mobile stations 105 to 109 include a transmitting / receiving section 301 having a transmitting section 305 and a receiving section 306, an antenna 300 connected to the transmitting / receiving section 301, a switch section 302 having switches 307 and 308, and a predetermined It includes a control unit 304 for controlling the transmission / reception unit 301 and the switch unit 302 so that communication is performed in a time slot, and a human interface unit 303.
  • FIG. 4 is a diagram showing a configuration example of the base stations 102 to 104.
  • the base station includes a transmission / reception unit 401 having a transmission unit 410 and a reception unit 411, an antenna 400 connected to the transmission / reception unit 401, and a communication having switches 412, 413, and an interface unit 405.
  • GPS global positioning system
  • the control unit 403 As shown in the figure, a transmission quality detection unit 414 and a reception timing control unit 415 are provided.
  • the Global Positioning System GPS 400 is provided to synchronize between base stations by absorbing the delay time difference of the digital transmission line 114 connected to each base station due to the difference in transmission line length. It is something that can be done.
  • the base station establishes a clock in accordance with the GPS 400 time signal, thereby synchronizing between the base stations.
  • the numbers 1 to 64 shown in the figure indicate time slot numbers.
  • Each of the 64 slots can be used as either a communication time slot assigned to each user or a control time slot commonly used by many users.
  • all 64 slots are allocated to communication time slots.
  • the communication time slot refers to a time slot for transmitting user information such as voice, and corresponds to a conventional communication channel. Once allocated to a mobile station, the communication time slot is occupied by that mobile station until communication is terminated.
  • the method for allocating a time slot according to the present invention is as follows.
  • the signal from the human interface unit 303 is modulated by the transmission unit 305 via the switch 307, and transmitted from the antenna 300.
  • the signal is demodulated and sent to the switch 413.
  • the transmission quality detection unit 415 calculates the time slot utilization rate of the occupied radio frequency based on the reception signal from each mobile station processed by the communication processing unit 402.
  • FIG. 6 is a flowchart for explaining a method of allocating a time slot according to the present invention.
  • the time slot utilization rate Ua (%) is calculated from the ratio of the total number of time slots in the occupied radio frequency allocated to each base station to the number of time slots used for communication as shown in the following equation (Step 1). ).
  • (Time slot utilization rate Ua (%) 703) is calculated from the ratio of the total number of time slots in the occupied radio frequency allocated to each base station to the number of time slots used for communication as shown in the following equation (Step 1). ).
  • (Time slot utilization rate Ua (%) 703)
  • the transmission quality detection unit 415 of each base station regards a slot that is considered to be a low-power, no-signal slot as an idle time slot, obtains the number of time slots used for communication, and registers a previously registered occupied radio. It is determined by the ratio with the total number of time slots in the frequency.
  • the time-slot utilization rate Ua (%) calculated by the transmission quality detection unit 415 is transmitted from the interface unit 405 to the base station control device 101 via the digital transmission path 114.
  • the time slot utilization rate Ua () transmitted from each base station is transmitted to the resource management Z allocating section 204 in the control section 201.
  • the time slot utilization rate Ua (%) is stored in the time slot management table 206 of the occupied radio frequency in the DB unit 205 (Step 2).
  • the occupied radio frequency time slot management table 206 is configured, for example, as shown in FIG.
  • the occupied radio frequency time slot management table 206 includes an occupied radio frequency 701, a base station number 702, a time slot utilization rate Ua (%) 703, a used time slot number 704, and a total time slot in the occupied radio frequency.
  • the number of lots, such as 705, is stored.
  • Fig. 7 shows the calculation results of the time slot utilization rate Ua () as an example.
  • the time slot utilization rate Ua (3 ⁇ 4) is stored, for example, by rounding up decimal places.
  • the resource management Z allocating section 204 stores in the DB section the cells in which the time slot utilization rate Ua is 90% or more, that is, the base station numbers in which there is a lot of traffic and the number of available slots is insufficient.
  • the time slot management table 206 for the occupied radio frequency in 205 is searched and the base station number is stored. If there is no base station with an insufficient number of available slots, the traffic is not enough to allocate a shared radio frequency, and the processing shifts to processing (13) (step 3).
  • the resource management allocating section 204 obtains the required number of time slots S to be added to each base station based on the occupied radio frequency time slot management table 206, and obtains the occupied radio frequency time slot management table 206.
  • the time slot utilization rate Ua) of base station number 1 is 90% or more. Therefore, four time slots are allocated from the shared radio frequency.
  • S may be a predetermined constant value, or the number of time slots to be allocated may be dynamically varied in consideration of the time variation of traffic in the cell. For example, it is well known that there is a time zone where congestion is expected empirically, but it is conceivable that the number of allocated slots is set to be larger than usual during that time. Further, a value proportional to Ua may be set as S.
  • the Z allocating unit 204 performs time slot management of the occupied radio frequency in the DB unit 205 by dividing the total number of time slots S allocated to the cell units (group cells) managed by the base station controller 101. Determined from table 206 (step 4).
  • FIG. 8 shows an example of the configuration of the time-to-mouth management table 207 of the shared radio frequency.
  • the shared radio frequency time slot management table 207 stores a shared radio frequency 801, the number of used time slots 802, the total number of time slots in the shared radio frequency 803, the number of available time slots 804, and the like. .
  • the number of empty time slots is calculated by the following formula.
  • the number of used time slots is always grasped for each base station by the resource management / allocation unit 204 and is stored in the time slot management table 207 of the shared radio frequency.
  • the resource management Z allocating unit 204 compares ⁇ S and ⁇ Tb, and if there is a shortage of free slots for the shared radio frequency fxj to be allocated to the cell ( ⁇ ⁇ ⁇ Tb ⁇ S), a new shared Add the radio frequency fx (j + l) to the group cell.
  • Step 8 Update the time slot management tables 206 and 207. After the timer is activated, the process from (1) is repeated after a certain period of time (for example, when 120 seconds have elapsed assuming a normal voice call time) (Step 8).
  • the resource management Z allocating section 204 of the base station control apparatus 101 sends the allocation signal of the evening mouth to each base station via the digital transmission line 114.
  • the time slot assignment signal includes an identifier indicating one of the shared radio frequencies and an identifier indicating the time slot.
  • the base station that has received the time slot assignment signal sends a time slot to the mobile station based on the shared radio frequency specified by the time slot assignment signal of the base station controller 101 and the time slot. Send an assignment signal of.
  • the signal from the base station received by the antenna 300 of the mobile station is sent to the receiving section 306, where it is demodulated and passed through the switch 304 to the human interface section 303. Processing such as images or voices is performed within the system to exchange information with the user.
  • the control unit 304 controls the transmission / reception unit 301, the switch unit 302, and the human interface unit 303.
  • the present invention has been described in detail based on the embodiments. However, the present invention is not limited to this.
  • the time slot utilization rate is measured in each base station, but may be collectively measured in the base station controller.
  • the number of TDMA multiplexes is 64, but it is not necessary to be 64. It can also be applied to the TD-CDMA system that performs code division multiplexing within each time slot.
  • FIG. 9 shows the relationship between the number of time slots and the number of radio frequencies when the present invention is applied.
  • radio resources were fixedly allocated to one cell, which caused many idle time slots.
  • 63 timeslots became empty timeslots, and the efficiency of frequency utilization was reduced.
  • an empty time slot not used in the cell C 1 is allocated to the other cells C 2 and C 3 in the service area. Free time slot can be reduced. This effect increases as the number of shared cells increases. For example, if the shared radio frequency is shared by 10 cells, the idle time slot can be reduced to 1/10. That is, in the example of FIG. 12, the empty timeslot of 63 timeslots can be suppressed to an average of 6 timeslots. As a result, the problem can be solved, and as a result, it is possible to promote effective use of wireless resources and increase traffic capacity. Industrial applicability
  • the present invention uses a plurality of timeslots of a shared radio frequency that does not interfere with the existing occupied frequency in accordance with the traffic fluctuation of each cell. By allocating to cells, it is possible to promote effective use of available time slots and frequencies.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Système de communication mobile AMRT, dans lequel des créneaux temporels supplémentaires de canaux radio sont attribués aux stations de base en fonction du trafic. Les fréquences occupées, sans duplication entre cellules adjacentes, sont attribuées de manière fixe aux stations de base (102-104). Celles-ci calculent l'utilisation des créneaux temporels occupés qui leur sont attribués et envoient le résultat dudit calcul à un contrôleur de stations de base (101). En réponse au calcul d'utilisation des créneaux temporels transmis par les stations de base, le contrôleur de stations de base (101) accorde à ces dernières des créneaux d.
PCT/JP1999/000085 1998-01-14 1999-01-13 Systeme de communication mobile amrt WO1999037110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP536798 1998-01-14
JP10/5367 1998-01-14

Publications (1)

Publication Number Publication Date
WO1999037110A1 true WO1999037110A1 (fr) 1999-07-22

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PCT/JP1999/000085 WO1999037110A1 (fr) 1998-01-14 1999-01-13 Systeme de communication mobile amrt

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7274725B2 (en) 2000-12-28 2007-09-25 Siemens Communications, Inc. System and method for adaptive carrier occupancy in a frequency hopping spread spectrum system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03175828A (ja) * 1989-12-05 1991-07-30 Nec Corp 移動体通信周波数割付方式
JPH04306924A (ja) * 1991-04-03 1992-10-29 Toshiba Corp 移動無線通信システム
JPH0530021A (ja) * 1991-04-18 1993-02-05 Mitsubishi Electric Corp 移動体通信の通話チヤネル割当方法
JPH05316039A (ja) * 1992-05-12 1993-11-26 Nec Corp 移動無線電話交換システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03175828A (ja) * 1989-12-05 1991-07-30 Nec Corp 移動体通信周波数割付方式
JPH04306924A (ja) * 1991-04-03 1992-10-29 Toshiba Corp 移動無線通信システム
JPH0530021A (ja) * 1991-04-18 1993-02-05 Mitsubishi Electric Corp 移動体通信の通話チヤネル割当方法
JPH05316039A (ja) * 1992-05-12 1993-11-26 Nec Corp 移動無線電話交換システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7274725B2 (en) 2000-12-28 2007-09-25 Siemens Communications, Inc. System and method for adaptive carrier occupancy in a frequency hopping spread spectrum system

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