WO1996023371A1 - Systeme mobile de communications radio - Google Patents
Systeme mobile de communications radio Download PDFInfo
- Publication number
- WO1996023371A1 WO1996023371A1 PCT/JP1996/000122 JP9600122W WO9623371A1 WO 1996023371 A1 WO1996023371 A1 WO 1996023371A1 JP 9600122 W JP9600122 W JP 9600122W WO 9623371 A1 WO9623371 A1 WO 9623371A1
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- WIPO (PCT)
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- channel
- electric field
- base station
- communication system
- mobile communication
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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
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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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
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
Definitions
- a microcell is configured in the same area as the service area of the small zone mobile communication system, and a channel in which interference is not a problem from the same band as the frequency band allocated to the small zone mobile communication system. It relates to a mobile communication system that is selected and shared within a microcell.
- a mobile communication system in which a microcell is configured in the same area as the service carrier of the small-zone mobile communication system that has already been established and shares the same frequency band is being considered.
- Such conventional examples are shown in FIGS.
- Figure 1 shows the layout of wireless base stations.
- the service area 102 is composed of a plurality of wireless zones centered on the wireless base station 101.
- the radio band allocated to this method is divided into multiple channel groups, which are reused repeatedly in radio zones separated by a certain distance.
- a radio base station 103 of a scheme different from the scheme A or a scheme that is the same but can be operated independently (hereinafter, referred to as “method B”) is arranged. Make up 0 4.
- the radio base station 103 can select and reuse a channel that does not cause a problem in terms of interference from the same frequency band as the frequency band assigned to the scheme A.
- FIG. 2 is a diagram illustrating mutual interference.
- the mutual interference that the radio base station 103 should consider when selecting a channel includes the radio base station 101 of scheme A, the mobile station 105 of scheme A, the radio base station 103 of scheme B, and the scheme Four types of interference for mobile station 106 of B. That is,
- an electric field monitoring device is installed in the service area of method B.
- Figure 3 shows this method.
- a plurality of electric field monitoring devices 107 capable of measuring the reception level from the radio base station 101 of method A are installed in the service area 104 of method B, and the radio waves of method B are installed.
- FIG. 4 shows a detailed configuration of the wireless base station 101 and the electric field monitoring device 107.
- the wireless base station 101 includes a transceiver 111 for communicating with the mobile station and a base station controller 112, and the electric field monitoring device 107 receives signals from the wireless base station of the method A.
- An electric field monitoring receiver 113 for measuring the electric field level, an electric field level detector 111, and a control device 115 for judging whether or not the electric field can be used based on the received level are provided.
- Controller 1 15 measures the received electric field level of all frequencies (channels) used in method A, From that value, the uplink interference level to the system A radio base station is estimated, compared with a preset level threshold, and if it is below the threshold, interference is given to the system A radio base station. It judges that there is no channel, and notifies the base station controller 112 to use that channel.
- the base station control device 112 sets the channel used by the transceiver 111 to the one notified from the control device 115.
- the present invention solves such a problem, and does not require a special electric field monitoring device for measuring a downlink interference level from an existing wireless base station, and dramatically improves the measurement accuracy of the interference level. It is an object of the present invention to provide a mobile communication system.
- a first group of wireless base stations belonging to a first mobile communication system and a first mobile station is provided by a plurality of wireless zones centered on the first group of wireless base stations.
- a service area of a communication system is configured, and a second group of wireless base stations belonging to a second mobile communication system independent of the first mobile communication system are provided in the service mobile of the first mobile communication system.
- Each of the second group of radio base stations has a control channel from a channel in which the amount of mutual interference between the first group of radio base stations and the other second group of radio base stations is within a predetermined value.
- Mobile station Means for instructing measurement of the electric field strength by designating a channel to the mobile station, and means for receiving information on the measurement result of the electric field strength of the specified channel from the mobile station.
- the mobile station to which it belongs is provided with means for measuring the electric field strength by tuning the reception frequency to the channel specified by the pointing means, and And a means for receiving the result from the mobile communication system.
- a channel whose electric field level is to be measured from the radio base station via a downlink control channel or a communication channel is designated, and the mobile station that has received the measurement instruction has the mobile station It measures the electric field level of the specified channel (frequency) using the electric field level measurement function normally provided, and reports the result to the radio base station via the uplink control channel or communication channel.
- the existing small zone mobile communication system can be used as the first mobile communication system, and the second mobile communication system can be constructed in the same area as the service area.
- the first group of radio base stations are assigned radio bands that can be used in the first mobile communication system so as to be divided into a plurality of channel groups and reused repeatedly in radio zones separated from each other.
- Each of the wireless base stations can include means for transmitting a base station by assigning a base station identification code for identifying itself to each channel.
- the mobile station belonging to the second mobile communication system includes means for demodulating a radio signal from the first group of radio base stations to identify the base station identification code, and means for identifying the identified base station.
- Radio signal channels are divided into groups for each radio base station that uses the channel, and each group is subjected to arithmetic processing on the electric field strength measured on the channel belonging to that group to form one representative.
- the means for selecting is configured so that the use of channel selection can be determined for each channel based on the measured electric field strength of each channel.
- the identifying means identifies another base station identification code, or for a new channel.
- the difference between the measured electric field strength and the previously measured electric field strength exceeds a predetermined threshold or value, it is preferable to give priority to the judgment in channel units.
- a first group of wireless base stations belonging to the first mobile communication system is provided, and a plurality of wireless zones centered on each of the first group of wireless base stations are used.
- radio bands usable in the first mobile communication system are divided into a plurality of channel groups, and radio zones separated from each other are provided.
- Each of the first group of radio base stations includes means for transmitting a base station identification code for identifying its own station to each channel for transmission.
- a second group of wireless base stations belonging to a second mobile communication system independent of the first mobile communication system is provided in a service carrier of the first mobile communication system.
- First-class wireless base stations and others Means for selecting a control channel and a communication channel from channels in which the amount of mutual interference with the second group of radio base stations is within a predetermined value;
- Means for allocating to a mobile station belonging to a second mobile communication system located in a mobile communication system comprising: electric field monitoring means connected to the selecting means, the electric field monitoring means comprising: Means for demodulating the radio signal from the station to identify the base station identification code, and grouping the channel of the radio signal from the identified base station identification code for each radio base station using the channel.
- the electric field monitoring device gives priority to the means for judging whether channel selection can be used or not on a channel basis from the measured electric field strength for each channel and the means for judging on a channel basis when the electric field monitoring device is started up or after a reset. And a means for giving priority to means for judging a plurality of channels as a unit thereafter.
- the means for operating is performed when the existing base station identified by the means for identifying the existing base station changes, or the difference between the newly measured electric field strength and the previously measured electric field strength for the same channel.
- the threshold value exceeds a predetermined threshold value, it is possible to include means for giving priority to the means for judging on a channel basis.
- FIG. 1 is a diagram illustrating a conventional technique, and is a diagram illustrating an arrangement of wireless base stations.
- FIG. 2 is a view for explaining mutual interference in the wireless base station arrangement shown in FIG.
- FIG. 3 is a diagram showing a conventional method of measuring a downlink interference level.
- FIG. 4 is a block diagram showing a configuration example of a conventional radio base station when a downlink interference level is measured in the radio base station.
- FIG. 5 is a diagram showing a configuration of a mobile communication system according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing an example of a signal format of a control channel and a communication channel of the existing small zone mobile communication system.
- FIG. 7 is a block diagram illustrating a configuration example of a wireless base station.
- FIG. 8 is a block diagram showing a configuration example of a mobile station.
- FIG. 9 is a diagram illustrating a specific operation.
- FIG. 10 is a diagram illustrating measurement at a mobile station in the TDMA system, and is a diagram illustrating a signal format of three-channel TDMA.
- FIG. 11 is a diagram for explaining measurement in the FDMA method.
- FIG. 12 is a diagram for explaining measurement in the FDMA method.
- FIG. 13 is a diagram illustrating frequency bands used for uplink and downlink.
- FIG. 14 is a diagram for explaining selective fading.
- FIG. 15 is a view for explaining a reception level difference between an uplink and a downlink in the same channel.
- FIG. 16 is a diagram showing a configuration of a mobile communication system according to a second embodiment of the present invention.
- FIG. 17 is a block diagram showing a configuration example in which a wireless base station and an electric field monitoring device are shared.
- Fig. 18 is a block diagram showing a configuration example in which the wireless base station and the electric field monitoring device are separately installed.
- FIG. 19 is a diagram showing the flow of control by the control device.
- FIG. 20 is a diagram showing an example of recording contents of measurement results and grouping of channels used by the same radio base station.
- FIG. 21 is a diagram showing an example of a channel availability table.
- FIG. 22 is a block diagram showing another configuration example of the radio base station and the electric field monitoring device.
- FIG. 23 is a diagram showing a flow of control of the judgment.
- FIG. 24 shows an example of a channel availability table.
- FIG. 25 is a flowchart showing an example of the overall control operation of the control device.
- FIG. 26 is a flowchart showing another example of the overall control operation of the control device.
- FIG. 5 is a diagram showing a configuration of a mobile communication system according to the first embodiment of the present invention
- FIG. 6 shows an example of a signal format of a control channel and a communication channel of an existing small zone mobile communication system.
- a wireless base station 3 provided independently of the small zone mobile communication system is provided in a service area 2 of the existing small zone mobile communication system. Select a channel that does not cause mutual interference in the same frequency band as the frequency band assigned to the communication system, and assign the selected channel to the mobile station 6 located in the wireless zone of the wireless base station 3. Can be. The selection of a channel by the radio base station 3 is based on the O
- the mobile station sends information on the measurement results of the electric field strength of the specified channel.
- Method A is, for example, a digital car system stipulated in the radio telephone system development center RCRSTD-27 of the Radio System Development Center, which currently provides services in Japan. It is conceivable that the car system was partially modified.
- the service area 2 includes a plurality of radio base stations 1 belonging to scheme A (shown as “base stations of A” in the figure), and is configured by a plurality of radio zones centered on each radio base station 1.
- Service Area 2 is composed.
- the radio band allocated to scheme A is divided into multiple channel groups, which are repeatedly reused in radio zones separated by a certain distance.
- Each radio base station 1 is provided with a control channel for performing connection control for outgoing and incoming calls, and a communication channel for performing communication. As shown in FIG. 6, these channels include a base station identification code for individually identifying the radio base station 1, information data for a communication channel, transmission power and a control channel. And control data including information specific to other wireless base stations.
- the base station identification code for example, a color code specified in the mobile phone system standard RCR STD-27 by the Radio System Development Center is used.
- the control channel and the communication channel are all composed of a downlink transmitted by the radio base station and received by the mobile station, and an uplink channel transmitted by the mobile station and received by the radio base station.
- the radio zone of the radio base station 3 of the scheme B is set smaller than the radio zone of the radio base station 1 of the scheme A. In the example shown in FIG. 5, the number of wireless base stations 3 is one for simplicity, and the wireless zone is service area 4 of method B.
- FIG. 7 is a block diagram showing a configuration example of the radio base station 3
- FIG. 8 is a block diagram showing a configuration example of the mobile station 6.
- the radio base station 3 transmits the transmitter 21 and the In addition to receiver and receiver 22, encoder 23 for encoding the signal of the channel number, decoder 24 for decoding the level information and other signals transmitted from the mobile stations, and a control device for controlling the whole It has 2 5.
- the mobile station 6 includes, in addition to a receiver 31 and a transmitter 32 for performing communication, a decoder 34 for decoding a signal of a channel number to be measured transmitted from the radio base station 3, An electric field level detector 35 for monitoring the channel of A, a decoder 36 for decoding, for example, a color code or other signals contained in the channel, a decoder 34 for decoding the output of the receiver 31, A switch 33 for switching to one of the electric field level detector 35 and the decoder 36, a encoder 37 for encoding a color code and other signals and outputting the same to the transmitter 32, and a control device 3 for controlling the entire system 8 is provided.
- FIG. 9 is a diagram illustrating a specific operation. This operation will be described with reference to FIGS. 6 to 8.
- the scheme B radio base station 3 selects the mobile station 6 located in the scheme B service area 4.
- the radio base station 3 sends a level measurement request to the selected mobile station 6 via a downlink control channel or a communication channel, and specifies a channel (frequency) number to be measured.
- the electric field level from the radio base station 1 is measured and stored together with the channel number in the memory in the control device 38.
- the color code and other signals included in the measured channel are decoded by the decoder 36, and are simultaneously stored in the memory in the control device 38.
- the control device 38 transmits the channel number, the electric field level, the color code, etc., autonomously or in accordance with the transmission instruction from the radio base station 3 via the encoder 37 and the transmitter 32. Transmit to base station 3.
- the radio base station 3 decodes the content transmitted from the mobile station 6 and And the channel number together with the channel number.
- the controller 25 further considers the transmission power difference between the uplink and the downlink, the feeder loss difference, etc., from the measured downlink electric field level for each channel, and Estimate the uplink interference level from the mobile station 6 and select whether to use it.
- the broken line in FIG. 9 indicates a case where the measurement result is transferred by a request from the wireless base station 3.
- the channel used for signal transfer between the radio base station 3 and the mobile station 6 differs depending on whether the mobile station 6 is on standby or on a call.
- the explanation is based on the signal transfer method specified in the digital car telephone system standard RCR STD-27 by the Radio System Development Center.
- the mobile station 6 transmits a level measurement request and returns a channel number, an electric field level, a color code, and the like using the dedicated cell channel (S CCH).
- S CCH dedicated cell channel
- the waiting mobile station normally receives only the paging channel (PCH) intermittently, and receives the individual cell channel only during the location registration operation or other limited times. Therefore, the transmission of the level measurement request from the wireless base station 3 needs to be performed while the mobile station 6 is receiving the individual cell channel.
- PCH paging channel
- the mobile station 6 perform location registration at a fixed time period, and when the mobile station is in a state where it can receive SCH at the time of location registration, it is desirable to transmit a level measurement request from the base station. Further, when the mobile station 6 is busy, it transmits a level measurement request and returns a channel number, an electric field level, a color code, and the like using the high-speed associated control channel (FACCH).
- FACCH high-speed associated control channel
- FIG. 10 is a diagram for explaining measurement at a mobile station in the TDMA system, and shows a signal format of a three-channel TDMA.
- the TDMA system there are slots that are not used by the mobile station even during communication or waiting while not performing communication. If this time is used to measure the electric field strength of the specified channel, it will not disturb the communication of the selected mobile station.
- FIG. 11 and FIG. 12 are diagrams illustrating measurement in the FDMA system.
- the mobile station In the FDMA system, the mobile station generally performs reception while communication is in progress, so if the electric field strength of a specified channel is measured, communication will be interrupted during that time. Therefore, in the case of the FDMA system, as shown in FIG.
- a mobile station that is not in communication with the wireless base station of the system B and is not in communication is selected, and the mobile station performs measurement.
- the mobile station stores the specified channel number, and measures the electric field level of the specified channel number while the mobile station is not communicating.
- the broken line in FIG. 12 shows the case where the measurement result is transferred by a request from the radio base station.
- the mobile station located in the area is used as an electric field monitoring device, there is no need to install a fixed electric field monitoring device at all, which is excellent in economy.
- the mobile station can move to every corner in the area, it is possible to obtain the same measurement accuracy as installing a fixed electric field monitoring device all over the area, and select a channel that does not cause interference. It can be performed with high accuracy.
- the uplink interference level from the mobile station to the scheme A wireless base station can be estimated from the measured value of the downlink interference level from the scheme A wireless base station to the scheme B mobile station.
- different frequency bands are used for the uplink transmitted by the mobile station and received by the radio base station and the downlink transmitted by the radio base station and received by the mobile station.
- high accuracy cannot be obtained only by estimating the uplink interference level from the downlink interference level due to the influence of selectivity fusing. this Such an example will be described below.
- the uplink margin is required to be 20 dB uniformly, and the uplink interference level given to the radio base station of scheme A is uniform to the received electric field level of each channel measured by the mobile station of scheme B. And 20 dB.
- the estimated uplink interference level in which the uplink margin is corrected uniformly to the measured downlink interference level, is compared with the level threshold to determine whether or not use is possible. Since the margin may be excessive, it may be determined that the channel cannot be used even for a channel that can actually be used as a line that does not actually cause interference, and the number of channels that can be used in method B is reduced.
- the uplink interference level is collectively estimated for each wireless base station and whether or not to use the channel is determined for each wireless base station. It is better to do. That is, in a mobile communication system under the fusing environment where the received electric field level fluctuation characteristic is selective, the downlink interference level of the wireless base station of the existing system is measured, and the uplink interference level given to the wireless base station of the existing system is measured from the measured value.
- the radio channels used by the same radio base station are specified, the representative value of the downlink interference level received on those channels, for example, the average value, is calculated, and the uplink margin is added to that value.
- the uplink interference level is collectively estimated for each radio base station. Such an embodiment is described below.
- FIG. 16 is a diagram showing the configuration of the mobile communication system according to the second embodiment of the present invention.
- the mobile communication system is a wireless communication system provided independently of the small zone mobile communication system in a service area 2 of an existing small zone mobile communication system such as a mobile phone or a mobile phone.
- the base station 3 includes a base station 3 that selects a channel that does not cause any mutual interference from the same frequency band as the frequency band allocated to the small-zone mobile communication system, and sets the selected channel to the radio channel. It can be assigned to the mobile station 6 located in the wireless zone of the base station 3.
- the small zone mobile communication system that provides the service area 2 is referred to as “method A”
- method B the mobile communication system to which the wireless base station 3 belongs
- a base station 14 is shown as “A base station”), and multiple radio booms around each of them constitute a service area 2 of method A.
- the radio band allocated to scheme A is divided into multiple channel groups, which are repeatedly reused in radio zones (radio base stations 11 1 to 11 n) separated by a certain distance.
- Each of the radio base stations 11 1 to 11 n is provided with a control channel for performing connection control for outgoing and incoming calls and a communication channel for performing communication, and these channels are configured as shown in FIG.
- Such a base station identification code is inserted.
- the wireless zone of the wireless base station 3 is set smaller than the wireless zones of the wireless base stations 1-1 to 1-n of the method A.
- one radio base station 3 of system B is used, and the radio zone of one radio base station 3 is service area 4 of system B.
- an electric field monitoring device 7 that monitors radio waves transmitted from the wireless base stations 11 1 to 11 1 n of the method A is provided.
- This electric field monitoring device 7 demodulates a wireless signal of the method A, identifies the wireless base stations 11 to 11 that have transmitted the wireless signal, and identifies the wireless base stations 11 to 11 that are used by the same wireless base station. Identify multiple channels and find the average of the interference levels received on those channels.
- the radio base station 3 determines whether channel selection can be used or not on a channel group basis based on the average value obtained by the electric field monitoring device 7.
- the electric field monitoring device 7 is desirably implemented as one function of the mobile station as in the first embodiment, but may be implemented as a device separate from the mobile station. Here, a description will be given as a device different from the mobile station. When the electric field monitoring device 7 is implemented as a device different from the mobile station, the electric field monitoring device 7 may be disposed at a different location from the radio base station 3 or may be disposed at the same location as the radio base station 3.
- base station identification codes of the wireless base stations 1-1 to 1-1 n are assumed to be C1 to Cn.
- the number of channels assigned to each of the radio base stations 111 to 111 is assumed to be the same number m for ease of explanation, and the frequencies are fl, i to: fn, i, and the electric field level.
- FIG. 17 and FIG. 18 show two configuration examples of the radio base station 3 and the electric field monitoring device 7.
- the configuration example shown in FIG. 17 is a configuration in which the wireless base station 3 and the electric field monitoring device 7 are shared, and the configuration example shown in FIG. 18 is a configuration in which they are separately installed.
- the antenna 31, the transceiver 32, and the base station controller 33 are provided as the wireless base station 3, and the antenna 71, the electric field monitoring receiver 72, and the electric field level detector 7 are used as the electric field monitoring device 7. 3. It has a decoder 74 and a controller 75.
- the transceiver 32 is for communicating with a system B mobile station, and is controlled by the base station controller 33.
- the electric field monitoring receiver 72 receives the downlink from the system A radio base station, and the electric field level detector 73 measures the received electric field level.
- the decoder 74 demodulates the base station identification code from the received signal of the electric field monitoring receiver 72.
- FIG. 17 shows an example in which the antenna 31 of the transceiver 32 and the antenna 71 of the electric field monitoring receiver 72 are separately provided, these can be shared.
- FIG. 19 shows the flow of control of the electric field monitoring receiver 72 by the control device 75.
- this control is the control of the electric field monitoring receiver 72 by the control device 75.
- the controller 75 classifies the contents recorded in the memory by the base station identification code, and groups the channels used by the same radio base station. . This is shown in FIG.
- control device 75 calculates and averages the electric field levels of the channel fi of the same radio base station 11 k based on the grouping result, and averages the electric field levels from the system A radio base station. Average electric field level E av
- E av ( ⁇ fk, i) / Is calculated. Then, the calculated average value Eav of the electric field level is added to the effective radiated power of the uplink and the downlink, the difference of the feeder loss, and a preset uplink line margin, and the uplink to the radio base station of method A is added.
- the base station controller 33 determines necessary values from the table in ascending order of the estimated uplink interference level, and in the case of the same level, for example, in ascending order of the number. Allocate to transceiver 32 using only the number of channels.
- the above operation is performed periodically, and the channel availability table is updated.
- the above control is based on the assumption that the base station identification code can always be decoded.
- the uplink margin to be added when estimating the uplink interference is reduced. It is possible to increase the number of radio channels that can be used in the scheme B radio base station.
- FIG. 22 shows a configuration example of the wireless base station 3 and the electric field monitoring device 7.
- the electric field monitoring device 7 is desirably implemented as one function of the mobile station.
- a configuration in which the electric field monitoring device 7 is a device separate from the mobile station and is shared with the radio base station 3 is shown.
- the radio base station 3 includes an antenna 31, a transceiver 32, and a base station controller 33, and the electric field monitoring device 7 includes an antenna 7. 1, electric field monitoring receiver 72, electric field level detector 73, decoder 74 and control device 75 are provided.
- the electric field monitoring device 7 further includes a switch 7 6 for switching between a state where the output of the electric field monitoring receiver 75 is supplied only to the electric field level detector 73 and a state where the output is supplied to the electric field level detector 73 and the decoder 7. Is provided.
- the control device 75 has a function of detecting only the reception electric field level to determine whether or not the channel can be selected (hereinafter referred to as “hi judgment”), and a function of detecting the channel based on the reception electric field level and the demodulated base station identification code. A function (hereinafter referred to as “/ S judgment”) for judging whether or not the selection can be used is provided.
- Switch switch 76 is supplied to feed 3 and decoder 74. Since the / S decision is made by decoding the signal, it takes more time than the decision that measures only the electric field level.
- the electric field monitoring receiver 72, the electric field level detector 73, and the control device 75 may be shared or provided separately. Can also. Also, instead of switching the output of the electric field monitoring receiver 72 with the switch 76, the output of the electric field level detector 73 and the decoder 74 can be switched and used.
- FIG. 23 shows the flow of control for the judgment.
- the control flow of the / 3 judgment is exactly the same as that shown in FIG. 19, and the flow of the control of the judgment will be described here.
- the case of a judgment
- FIG. 25 shows the overall control operation flow of the controller 75.
- the monitoring function with a short measurement time that is, the judgment function is activated, and once the judgment on the availability of the channel is completed, the measurement time is Activate the monitoring function that can select more available channels that are slower, that is, the S judgment function.
- the number of usable channels is small, but the measurement is performed.
- the monitoring function that can select usable channels can be selected by the fast monitoring function (H judgment). After a certain period of time, the monitoring function can select more usable channels although the measurement time is slow. ) Can select more available channels.
- FIG. 26 shows another example of the overall control operation of the control device 75.
- the available channel can be determined by the fast determination of the measurement time. Therefore, it is possible to quickly select a channel that does not interfere with the method A radio base.
- the measurement time is slow but the number of usable channels can be selected. ⁇ The judgment function operates, so more channels can be used.
- the second embodiment of the present invention when estimating the uplink interference level from the downlink interference level in a state where the fluctuation characteristic of the reception electric field level is under the selective fading environment, an uplink margin to be added is required. Since it can be minimized, there is an effect that the number of usable wireless channels can be increased.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96901103A EP0752766B1 (en) | 1995-01-25 | 1996-01-24 | Mobile radio communication system |
KR1019960703867A KR100319309B1 (ko) | 1995-01-25 | 1996-01-24 | 이동통신시스템 |
CA002185782A CA2185782C (en) | 1995-01-25 | 1996-01-24 | Channel allocation for co-located systems based on interferring channel groups |
DE69634889T DE69634889T2 (de) | 1995-01-25 | 1996-01-24 | Mobile funkkommunikationsanordnung |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7/10122 | 1995-01-25 | ||
JP1012295 | 1995-01-25 | ||
JP7/10131 | 1995-01-25 | ||
JP1013195 | 1995-01-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996023371A1 true WO1996023371A1 (fr) | 1996-08-01 |
Family
ID=26345327
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1996/000122 WO1996023371A1 (fr) | 1995-01-25 | 1996-01-24 | Systeme mobile de communications radio |
Country Status (6)
Country | Link |
---|---|
US (1) | US5862487A (ja) |
EP (1) | EP0752766B1 (ja) |
KR (1) | KR100319309B1 (ja) |
CN (1) | CN1089972C (ja) |
DE (1) | DE69634889T2 (ja) |
WO (1) | WO1996023371A1 (ja) |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2754967A1 (fr) * | 1996-10-18 | 1998-04-24 | Motorola Ltd | Systemes de telephonie mobile |
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Also Published As
Publication number | Publication date |
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EP0752766A1 (en) | 1997-01-08 |
EP0752766B1 (en) | 2005-06-29 |
KR100319309B1 (ko) | 2002-04-24 |
CN1145705A (zh) | 1997-03-19 |
CN1089972C (zh) | 2002-08-28 |
DE69634889T2 (de) | 2005-12-08 |
US5862487A (en) | 1999-01-19 |
EP0752766A4 (en) | 1999-08-04 |
DE69634889D1 (de) | 2005-08-04 |
KR970700963A (ko) | 1997-02-12 |
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