WO2006131977A1 - 移動無線通信システム、基地局装置、無線ネットワーク制御装置および移動局装置 - Google Patents
移動無線通信システム、基地局装置、無線ネットワーク制御装置および移動局装置 Download PDFInfo
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- WO2006131977A1 WO2006131977A1 PCT/JP2005/010606 JP2005010606W WO2006131977A1 WO 2006131977 A1 WO2006131977 A1 WO 2006131977A1 JP 2005010606 W JP2005010606 W JP 2005010606W WO 2006131977 A1 WO2006131977 A1 WO 2006131977A1
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- base station
- candidate
- mobile station
- time information
- mobile
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- 238000004891 communication Methods 0.000 title claims description 59
- 238000001514 detection method Methods 0.000 claims abstract description 61
- 230000001360 synchronised effect Effects 0.000 claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000036962 time dependent Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 230000000875 corresponding effect Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 229910052701 rubidium Inorganic materials 0.000 description 2
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
- H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
Definitions
- Mobile radio communication system base station apparatus, radio network control apparatus, and mobile station apparatus
- the present invention relates to a mobile radio communication system, a base station apparatus, and a mobile station that effectively perform a handover in which a moving mobile station switches a communication destination base station on a mobile radio network in which synchronous and asynchronous base stations are mixed.
- the present invention relates to a radio network controller and a mobile station apparatus.
- the detection period of a handover destination base station candidate is determined depending on the original design of the mobile station.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-28778
- the present invention has been made to solve the above-described problems.
- Mobile radio communication system, base station apparatus, radio network control apparatus for allowing mobile station to reliably capture handover destination base station candidates even if asynchronous base stations are mixed in addition to synchronous base stations on the network And it aims at obtaining a mobile station apparatus.
- a mobile radio communication system is a mobile radio communication system in which a plurality of base station apparatuses and at least one mobile station apparatus communicate with each other while performing handover, wherein each base station apparatus is a mobile station in communication
- the effective time information depending on each base station is related to the handover destination base station candidate, and the mobile station sets the detection cycle necessary for acquiring the base station candidate based on the effective time information. Therefore, even if an asynchronous base station exists among the base station candidates, there is an effect that it can be surely captured. In addition, by setting the detection cycle to the maximum cycle that can capture the base station candidate, there is also an effect that the power consumption required for the mobile station to capture the base station can be minimized.
- FIG. 1 is a block diagram showing configurations of a base station and a mobile station according to Embodiment 1 of the present invention. is there.
- FIG. 2 is an explanatory diagram showing a configuration of a mobile radio network according to Embodiment 1 of the present invention.
- FIG. 4 is an explanatory diagram showing a second example of valid time information according to Embodiment 1 of the present invention.
- FIG. 5 is an explanatory diagram showing a third example of valid time information according to Embodiment 1 of the present invention.
- FIG. 6 is an explanatory diagram showing a fourth example of valid time information according to Embodiment 1 of the present invention.
- FIG. 7 is an explanatory diagram showing a fifth example of valid time information according to Embodiment 1 of the present invention.
- FIG. 8 is an explanatory view showing a combination example of valid time information according to the first embodiment of the present invention.
- FIG. 9 is a block diagram showing a configuration of a radio communication system according to Embodiment 2 of the present invention.
- FIG. 1 is a block diagram showing configurations of a base station and a mobile station according to Embodiment 1 of the present invention.
- the internal configurations of the base station (base station device) 710 and the mobile station (mobile station device) 711 are mainly shown only the functional parts related to the handover targeted by the present invention. Other functions shall be omitted.
- Base station 710 includes antenna 701, transmission / reception unit 702, base station candidate information generation unit 703, and valid time information generation unit 704.
- Base station candidate information generating section 703 generates handover destination base station candidate information representing a base station candidate serving as a handover destination for mobile station 711 based on the position of mobile station 711 in communication or the position of base station 710 It is a means.
- the valid time information generation unit 704 generates valid time information used for setting a detection cycle for detecting a signal of a base station candidate serving as a handover destination on the mobile station 711 side, corresponding to the handover destination base station candidate information. It is means to do.
- mobile station 711 includes antenna 101, transmission / reception unit 102, base station detection unit 103, and base station.
- a ground station detection control unit 104 is provided.
- Base station detection control section 103 is means for setting a detection cycle of a signal having a candidate for base station candidate serving as a handover destination based on the valid time information received by transmission / reception section 102 and the moving speed of its own device.
- Base station detecting section 104 is means for detecting a base station apparatus designated by handover destination base station candidate information at a set detection cycle.
- FIG. 2 is an explanatory diagram showing a configuration example of a mobile radio network to which the base station 710 and the mobile station 711 shown in FIG. 1 are applied.
- a communication network 714 radio network controllers 712a, 712b, base stations 710a,..., 710f and a mobile station 711 are shown.
- the wireless network control device 712a includes a clock source 715, to which base stations 710a and 710b including a synchronization unit 716 are connected via a wired transmission line.
- the other wireless network control device 712b includes a GPS (Global Positioning System) receiver, and base stations 710d and 710e each having a synchronization unit 716 are connected to this device via a wired transmission path.
- Base station 7 10c has a clock source 715, and base station 710f has a GPS receiver.
- the wireless network control devices 712a and 712b and the base stations 710c and 710f are connected via a communication network 714.
- the base stations 710a and 710b receive a reference clock from the clock source 715 of the wireless network control device 712a via a wired transmission path, and each synchronization unit 716 extracts and uses the reference clock and the reference timing. Therefore, both operate synchronously with the clock source 715 of the radio network controller 712a.
- the base stations 710d and 710e receive the GPS reference clock acquired by the GPS receiver 717 of the wireless network control device 712b via the wired transmission path, and extract and use the GPS reference clock by the respective synchronization units 716. Therefore, both are operating in sync with GPS.
- the base station 710f since the base station 710f has its own GPS receiver 717 and receives and uses the GPS reference clock, the base station 710f operates in synchronism with GPS in the same manner as the base stations 710d and 710e. Further, data is exchanged via the communication network 714 to the wireless network control units 712a and 712b and the base stations 710C 710d, 710e and 710fi. As the mobile station 711 moves, the mobile station 711 performs the handover operation described later and the base station 710a,... Communication will be performed.
- FIG. 1 and FIG. 2 the operation of the handover according to the mobile radio communication system of the present invention will be described.
- handover destination base station candidate information representing the destination base station is displayed as a base station candidate information generation unit. Generated in 703.
- three examples of methods for generating handover destination base station candidate information are shown below.
- the base station installation positions of all base stations are stored in advance, and the target base station 711 is mainly selected from the other base stations around the target base station 711.
- the base stations are selected and listed in order from the shortest distance.
- the location information of all base stations connected to the mobile radio communication system is stored in a common server (not shown) connected to the communication network.
- the base station 711 makes an inquiry from the base station candidate information generation unit 703 to the server when notifying the mobile station of a handover destination base station candidate.
- the server Based on the installation location of the base station 711 that has been inquired, the server extracts a plurality of base stations in the vicinity thereof as a candidate node for the handover destination, and sends it to the base station candidate information generation unit 703 of the base station 711. It is notified and listed as candidate information for the handover destination base station.
- the second method communicates with the mobile station 711 on the basis of the position of the mobile station 711, and includes other base stations adjacent to the base station 710.
- the mobile station 711 is close to V and the base station is selected as a handover destination base station candidate to generate handover destination base station candidate information. For example, if the mobile station is equipped with GPS, the mobile station calculates its own position and reports it to the base station. If the mobile station does not have a means for measuring its own position, it measures the round-trip communication time with the mobile station at multiple base stations and calculates the distance between the base station and the mobile station. It is known to perform point surveying, and the base station may acquire the position of the mobile station.
- the mobile station takes the initiative. Peripheral base station performed by the mobile station At a certain rate of candidate search processing, the base station is Let them search. Search results are collected at the base station, and base station candidates are determined from the search results.
- the handover destination base station candidate information generated by base station candidate information generation section 703 is sent to effective time information generation section 704 and transmission / reception section 702.
- the effective time information generation unit 704 generates later-described effective time information corresponding to the handover destination base station candidate information, and sends it to the transmission / reception unit 702.
- the transmission / reception unit 702 transmits the handover destination base station candidate information and corresponding effective time information from the antenna 701 to the mobile station 711.
- the base station 710 in FIG. 1 that is in communication with the mobile station 711 corresponds to one of the base stations 710a,..., 710f in FIG. If you think there will be an appropriate number of base stations, with the exception of base stations.
- the mobile station 711 receives the handover destination base station candidate information and the valid time information transmitted from the base station 710 via the antenna 101 by the transmission / reception unit 102.
- the received handover destination base station candidate information is input to the base station detection unit 104, and the valid time information on one side is input to the base station detection control unit 104.
- Base station detection control section 104 sets a base station detection cycle based on the valid time information and its own moving speed, and sends the base station detection period to base station detection section 103.
- the base station detection unit 103 detects the signal transmitted by the handover destination base station candidate by measuring the reception level of a known sequence that can identify the base station in the detection cycle received from the base station detection control unit 104.
- a known sequence CPICH or PSCHZSSC H
- the correlation power of is calculated.
- the base station first detects the correlation power of the common PSCH, and then calculates the correlation power of the S SCH transmitted at the same timing as the PSCH. Combining power CPICH correlation power is calculated using the specified scrambling code candidates.
- the correlation power is notified to the base station (or base station controller).
- the base station or base station controller
- FIG. 1 A first example of valid time information is shown in FIG. 1
- the effective time information in this case is composed of an ID (Identification) number for identifying a base station as a handover destination base station candidate and the effective time and the base station corresponding to this ID number.
- this ID number may be related to the scrambling code type, the relative transmission timing with the base station that is currently communicating!
- the effective time here refers to the same base station candidate again after a time that is an integral multiple of the period from when the mobile station was able to detect a reference signal transmitted at a certain period from the handover target base station candidate. Even if detection is performed, the base station candidate signal is within a specific search window size (or the time range that can be detected) (detection result). .
- This specific search window size represents the window size for investigating how much time is correlated before and after the timing when the correlation of the base station specific channel sufficiently exceeds the threshold in the CDMA method.
- the window size for investigating how much time the correlation is established before and after the timing when the correlation of the base station identification signal such as synchronization word and color code sufficiently exceeds the threshold is set.
- the search window size of the mobile station is fixed, the effective time that can be detected within the search window size can be specified. Therefore, the search window size is the same for all mobile stations used in the mobile radio communication system. It is desirable that the same value is guaranteed.
- the mobile station's search window size is notified to the base station, and the base station generates an effective time according to the search window size of each mobile station.
- the mobile station sets the detection period by increasing / decreasing the valid time generated by the base station according to its own mobile speed, taking into account its own mobile speed estimation capability for each manufacturer.
- the base station that is in communication with the mobile station calculates the moving speed of the mobile station and generates an effective time according to the calculated moving speed
- the mobile station uses the effective time as the detection period. It may be set. For example, measure the round-trip communication time with a mobile station at multiple base stations, calculate the distance between the base station and the mobile station, perform a three-point survey, and then change the speed of the mobile station based on the change in the distance over time. For example, a moving speed estimation method that cannot be performed by a mobile station is possible.
- the mobile station calculates the speed of its own aircraft and It is also possible to report to the station and calculate the effective time in consideration of the moving speed at the base station. In particular, when the mobile station is equipped with GPS, the accuracy is higher than that calculated by the base station. ⁇ The movement speed can be obtained.
- FIG. 4 shows a second example of valid time information according to the first embodiment.
- the valid time information in this case also includes an ID number for identifying each base station as a handover destination base station candidate, and a base station type and power corresponding to this ID number.
- the base station type represents the types of base stations 710a to 710f as classified in FIG. For example, assume that base station 710a in FIG. 2 corresponds to base station 710 communicating with mobile station 711 in FIG. 1, and that the valid time information in FIG. 4 is generated by base station 710a.
- the base station type of the handover destination base station candidate is a base station 710b that is synchronized with the network, or a base station 710d, 710e, 71 Of that is synchronized with GPS, or a clock source that is self-propelled.
- the base station is 710c.
- the local station is also posted in the list of valid time information and notified.
- a method that does not notify the base station type of its own station is also possible, but in this case, the relative clock source information is notified.
- the local station D number is 0003
- the base station type is self-propelled, so the base station is self-propelled and all other base stations appear to be self-propelled. Therefore, both ID number 0001 and ID number 0002 are notified as the base station type “self-running”.
- the mobile station determines that the captured candidate is valid as long as the mobile station does not move, and the mobile station moves
- the detection cycle is calculated from the moving speed estimated by the speed estimation function.
- the captured handover destination base station candidate when designated as free-running, it generally runs free-running with known clock accuracy (frequency stability) for each communication system. In contrast, the speed of deviating from the search window size increases by the frequency difference between the clock that the base station currently communicating with and the clock that the handover destination base station candidate uses as a reference.
- the mobile station calculates and sets the detection cycle of the base station candidate from the moving speed estimated by its own moving speed estimation function and the clock accuracy of the handover destination base station candidate.
- the local station network synchronization
- handover destination base station candidate free running 0.1 ppm
- search window size 25 microseconds. It is also assumed that the wireless network is synchronized to an extremely stable clock source such as rubidium.
- the timing of the search window size at which the handover destination base station candidate can be detected is shifted by 0.1 microsecond per second, so even when the moving speed is 0
- the search window size falls outside the range in seconds. If no handover is performed, the handover destination base station sets the channel based on the detection information of the mobile station, and the handover destination base station is not synchronized and the communication is disconnected (failover fails). . Therefore, it is understood that the mobile station needs to detect the handover destination base station candidate again within 250 seconds when the moving speed is 0.
- the local station GPSO. 05 ppm
- handover destination base station candidate self-running 0.1 ppm
- search window size 12 microseconds.
- the base station type of “self-running” is further set to self-running a: 0.05 ppm equivalent, free running b: 0. Can be classified as equivalent to lppm.
- the captured node base station candidate is designated as GPS synchronization, it is basically the same as self-running, and the mobile station uses the movement speed estimated by its own movement speed estimation function, From the GPS synchronization accuracy of the handover destination base station candidate, the detection cycle of the base station candidate is calculated.
- the handover destination base station candidate due to the movement of the mobile station can be detected from the movement speed estimated by the own movement speed estimation function. Calculate the speed at which the timing within the search window shifts (hereinafter abbreviated as “timing deviation speed”).
- timing deviation speed the speed at which the timing within the search window shifts
- the base station candidate information is displayed.
- the clock accuracy corresponding to the type of handover destination base station candidate (network synchronization, free-running, GPS synchronization, etc.) obtained from the information is derived.
- the timing shift speed is calculated from the clock accuracy and the clock accuracy of the base station in communication.
- the relative clock accuracy and timing deviation speed are calculated.
- the correspondence table may indicate the correspondence between the type of base station and the timing shift speed.
- the timing deviation speed calculated from the moving speed is added to the timing deviation speed calculated from the valid time information, and the timing deviation speed is obtained based on the moving speed of the mobile station and the valid time information.
- the value obtained by dividing the search window size by this timing deviation speed is set as the effective time, and a value less than the effective time is set as the detection period of the handover destination base station candidate.
- FIG. 5 shows a third example of valid time information according to the first embodiment.
- the effective time information in this case also includes the ID number for identifying each base station as a handover destination base station candidate, and the clock accuracy and power of the base station corresponding to this ID number.
- Clock accuracy represents the accuracy of the clock source of the base station or radio network controller.
- the base station 710a in FIG. 2 corresponds to the base station 710 in communication with the mobile station 711 in FIG. 1, and the valid time information in FIG. 5 is generated by the base station 710a.
- the accuracy of the clock source in this case is the accuracy “10E-9” of the clock source 715 included in the base station 710c corresponding to the ID number “0001” that is the handover destination base station candidate.
- the accuracy “10E-9” of the clock source 715 of the radio network controller 712b is the accuracy “10E-9” of the clock source 715 included in the base station 710c corresponding to the ID number “0001” that is the handover destination base station candidate.
- the speed at which the timing within the search window that can detect the handover destination base station candidate due to the movement of the mobile station is shifted (timing deviation speed) is calculated from the movement speed estimated by the movement speed estimation function of the mobile station.
- the relative value of the clock accuracy of the handover destination base station candidate with respect to the clock accuracy of the base station in communication is obtained from the valid time information, and the timing deviation speed based on the clock accuracy is also calculated.
- the timing deviation speed obtained from the moving speed is added to the timing deviation speed based on this clock accuracy, and the timing deviation speed is obtained based on the moving speed of the mobile station and the valid time information.
- the value obtained by dividing the search window size by this timing deviation speed is set as the effective time, and a value less than the effective time is set as the detection period of the handover destination base station candidate.
- the own station network synchronization
- handover destination base station candidate self-running 0.1 ppm
- search window size 25 microseconds
- moving speed 15 mZ seconds.
- the wireless network is synchronized to an extremely stable clock source such as rubidium. At this time, if it is running at 0.1 ppm, the timing within the search window at which a 0.1 microsecond knock-over base station candidate can be detected per second will shift.
- the mobile station In addition, if the mobile station is moving away from its base station at 15 mZ seconds, the mobile station generates the timing power of the received signal of the base station and the transmission timing. 0.1 Timing in the 1 microsecond search window shifts. In total, the timing in the 0.2 microsecond search window shifts up to a maximum of one second, and it becomes out of the search window size range in 125 seconds. If handover is performed in this state, the handover destination base station sets the channel based on the detection information of the mobile station, and the handover destination base station cannot synchronize and communication is interrupted (failover is failed). Therefore, the mobile station needs to operate to detect the handover destination base station candidate again within 125 seconds.
- the clock accuracy a relative accuracy in view of the base station power currently in communication may be used.
- the base stations 710e, 710f, and 710c that are candidates for the handover destination base station of the mobile station 711 are replaced with the absolute clock accuracy and clock source from the base station 710a.
- the base station 710a calculates the relative clock accuracy and notifies the mobile station 711 as the valid time information.
- the valid time information may be obtained by using a relative value of clock accuracy other than the example of FIG.
- FIG. 6 shows a fourth example of valid time information according to Embodiment 1.
- the effective time information in this case is composed of an ID number for identifying each base station as a handover destination base station candidate, and an identification number of a clock source that is synchronized with the network corresponding to this ID number.
- the identification number here represents a clock source identification number for identifying a clock source possessed by the base station and the radio network controller.
- the base station 710a in FIG. 2 corresponds to the base station 710 in communication with the mobile station 711 in FIG. 1, and the valid time information in FIG. 6 is generated by the base station 710a.
- the clock source identification number in this case is the clock source base station 710c or radio network controller 712a candidate for the handover destination base station candidate. Represents a number that identifies the source 715.
- the mobile station for example, knows that the clock accuracy is 0.05 ppm as a system, and recognizes that they are synchronized to the network if they have the same clock source identification number.
- the mobile station calculates the speed (timing deviation speed) that deviates the timing within the search window that can detect the handover destination base station candidate due to the movement of the mobile station from the movement speed estimated by its own movement speed estimation function.
- the effective time is obtained by dividing the search window size by the timing deviation speed, and this is used as the node for the handover destination.
- the clock source identification number of the handover destination base station candidate is different from the currently communicating base station, both base stations are considered to be self-running with a clock accuracy of 0.05 ppm, and the mobile station Clock accuracy power Calculates the timing shift speed.
- the timing deviation speed obtained from the moving speed is added to the timing deviation speed based on the clock accuracy to obtain the timing deviation speed based on the moving speed of the mobile station and the valid time information.
- the value obtained by dividing the search window size by this timing deviation speed is set as the effective time, and a value less than the effective time is set as the detection period of the handover destination base station candidate.
- FIG. 7 shows a fifth example of valid time information according to Embodiment 1.
- the effective time information in this case also includes an ID number for identifying each base station as a handover destination base station candidate, and a GPS synchronization accuracy type and power corresponding to this ID number.
- the GPS synchronization accuracy type represents the accuracy of the GPS receiver of the base station or the wireless network control device and the accuracy of the synchronization unit of the base station that uses GPS synchronization.
- the base station 710a in FIG. 2 corresponds to the base station 710 in communication with the mobile station 711 in FIG. 1, and the valid time information in FIG. 7 is generated by the base station 710a.
- the GPS synchronization accuracy type in this case is the accuracy of the synchronization unit 716 of the base station 710e that is a handover destination base station candidate, the accuracy of the GPS receiver 717 of the wireless network control device 712b, and the GPS reception of the base station 710f.
- the accuracy of machine 717 is determined on the mobile station side, which represents the relative accuracy with respect to the synchronization unit 716 of the base station 710d.
- the handover destination base station candidate due to the movement of the mobile station is determined from the movement speed estimated by the own movement speed estimation function. The timing within the search window that can be detected is shifted. Calculate the speed (timing deviation speed).
- the timing deviation speed is derived from the GPS synchronization accuracy type of the currently communicating base station and the GPS synchronization accuracy type of the handover destination base station candidate from the valid time information.
- a correspondence table between the GPS synchronization accuracy type and the timing shift speed is stored in the memory in advance, and the timing shift speed is derived using this correspondence table.
- the timing deviation speed obtained from the moving speed force is added to the timing deviation speed obtained from this GPS synchronization accuracy type to obtain the timing deviation speed based on the moving speed and effective time information of the mobile station. .
- the value obtained by dividing the search window size by the obtained timing deviation speed is set as the effective time, and a value less than the effective time is set as the detection cycle.
- the first to fifth examples of the valid time information have been described above. However, these may be used together as in the sixth example shown in FIG.
- the sixth example is a combination of the second example, the third example, and the fifth example. That is, the network accuracy of the handover destination base station candidates is synchronized with the base station, and the clock accuracy or the GPS synchronization accuracy is assigned as effective time information.
- the mobile station calculates the speed (timing deviation speed) that deviates the timing within the search window that can detect the handover destination base station candidate due to the movement of the mobile station from the movement speed estimated by its own movement speed estimation function. . Also, in the valid time information, the type of handover destination base station candidate (network synchronization, free-running, GPS synchronization, etc.) and GPS synchronization type are converted to clock accuracy corresponding to each type and type.
- a correspondence table between the base station type or the GPS synchronization accuracy type and the clock accuracy is stored in the memory in advance, and the clock accuracy is derived using this correspondence table.
- the timing deviation speed is calculated from the clock accuracy of the handover destination base station candidate.
- the timing deviation speed obtained from the moving speed force is added to the timing deviation speed obtained from the clock accuracy to obtain the timing deviation speed based on the moving speed of the mobile station and the valid time information.
- the value obtained by dividing the search window size by the obtained timing shift speed is set as the effective time, and a value less than the effective time is set as the detection cycle.
- the mobile station in response to the handover destination base station candidate information transmitted from base station 710 to mobile station 711, the mobile station performs handover destination base station candidate information.
- Base station candidate power in the report When the same base station candidate is detected again after a time that is an integral multiple of the period from the time when the reference signal transmitted at a certain period can be detected, the base station candidate The effective time that depends on each candidate base station that guarantees signal detection or effective time information that represents an index for deriving the effective time on the mobile station side is given to the mobile station 711.
- the detection frequency of the base station candidate power as the handover destination is set for detection so that the base station candidate is synchronized with the currently communicating base station 710.
- the base station candidate Even if it is not, it is possible to detect the base station candidate with certainty because it can be detected with the detection period set based on the valid time information considering that it is not synchronized. Further, by setting the detection period to the maximum period at which the handover destination base station candidate can be captured, the power required for capturing the handover destination base station candidate can be minimized.
- FIG. 9 is a block diagram showing the configuration of the mobile radio communication system according to Embodiment 2 of the present invention.
- the base station candidate information generation unit 703 and the valid time information generation unit 704 shown in FIG. 1 are configured to be provided in the radio network control device 7 12 instead of the base station 710.
- the wireless network control device 712 includes a base station control unit 705 that connects to one or a plurality of base stations and performs handover and the like.
- Base station candidate information generation section 703 generates hand over destination base station candidate information and sends it to effective time information generation section 704 and base station control section 700.
- the effective time information generation unit 704 generates effective time information corresponding to the received handover destination base station candidate information and sends it to the base station control unit 705.
- Radio base station control section 705 communicates handover destination base station candidate information and corresponding valid time information with mobile station 711 using a control channel for each mobile station (DCCH in W-CDMA) or a broadcast channel. The data is transmitted to the base station 710 in the middle, and transmitted to the mobile station 711 via this.
- DCCH in W-CDMA control channel for each mobile station
- the mobile station 711 that has received the handover destination base station candidate information and the valid time information, in the same manner as described in Embodiment 1, if the valid time information includes the valid time directly, determines the detection cycle from the valid time. By setting the detection cycle by calculating the effective time based on the effective time information in the mobile station 711 Detect base station candidates.
- the radio network control unit 712 that controls the plurality of base stations includes the valid time information generation unit 704 and the base station candidate information. Since the generation unit 703 is provided, the burden on the base station 710 can be reduced, and the same effects as in the first embodiment can be achieved.
- the mobile radio communication system ensures that even if there is an asynchronous base station among the base station candidates! Therefore, it will be effective for future application to mobile radio networks in which various types of synchronous and asynchronous base stations are mixed.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800500425A CN101194444B (zh) | 2005-06-09 | 2005-06-09 | 移动无线通信系统、基站装置、无线网络控制装置及移动站装置 |
US11/916,822 US8068839B2 (en) | 2005-06-09 | 2005-06-09 | Mobile radio communication system, base station apparatus, radio network controller, and mobile station |
PCT/JP2005/010606 WO2006131977A1 (ja) | 2005-06-09 | 2005-06-09 | 移動無線通信システム、基地局装置、無線ネットワーク制御装置および移動局装置 |
JP2007520003A JP4485573B2 (ja) | 2005-06-09 | 2005-06-09 | 移動無線通信システム、基地局装置、無線ネットワーク制御装置および移動局装置 |
EP05748818.1A EP1890398B1 (en) | 2005-06-09 | 2005-06-09 | Mobile radio communication system, base station apparatus, radio network controller and mobile station |
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PCT/JP2005/010606 WO2006131977A1 (ja) | 2005-06-09 | 2005-06-09 | 移動無線通信システム、基地局装置、無線ネットワーク制御装置および移動局装置 |
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US (1) | US8068839B2 (ja) |
EP (1) | EP1890398B1 (ja) |
JP (1) | JP4485573B2 (ja) |
CN (1) | CN101194444B (ja) |
WO (1) | WO2006131977A1 (ja) |
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JP2008187259A (ja) * | 2007-01-26 | 2008-08-14 | Kyocera Corp | 無線通信方法および無線通信端末 |
WO2009047971A1 (ja) * | 2007-10-12 | 2009-04-16 | Nec Corporation | 無線通信システム、通信方法、通信装置、制御装置、及びプログラム |
JP2012503428A (ja) * | 2008-09-17 | 2012-02-02 | クゥアルコム・インコーポレイテッド | 位置によって支援されたネットワークエントリ、スキャン、およびハンドオーバ |
JP2012509619A (ja) * | 2008-11-17 | 2012-04-19 | クゥアルコム・インコーポレイテッド | アクセス端末による遅延されたハンドオーバの条件付開始 |
JP2014161018A (ja) * | 2008-11-14 | 2014-09-04 | Qualcomm Incorporated | モバイル・デバイスのためのgps支援型セル選択 |
CN104427571A (zh) * | 2013-09-06 | 2015-03-18 | 北京信威通信技术股份有限公司 | 一种用于时分同步系统的gps辅助的移动终端切换方法 |
JP2015053650A (ja) * | 2013-09-09 | 2015-03-19 | 京セラ株式会社 | 無線通信システム |
US9521565B2 (en) | 2008-11-17 | 2016-12-13 | Qualcomm Incorporated | Declaring radio link failure based on target-specific threshold |
CN106686665A (zh) * | 2015-11-09 | 2017-05-17 | 北京信威通信技术股份有限公司 | 增加切换距离的方法及装置 |
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JP2008187259A (ja) * | 2007-01-26 | 2008-08-14 | Kyocera Corp | 無線通信方法および無線通信端末 |
WO2009047971A1 (ja) * | 2007-10-12 | 2009-04-16 | Nec Corporation | 無線通信システム、通信方法、通信装置、制御装置、及びプログラム |
JP2014116980A (ja) * | 2008-09-17 | 2014-06-26 | Qualcomm Incorporated | 位置によって支援されたネットワークエントリ、スキャン、およびハンドオーバ |
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CN104427571A (zh) * | 2013-09-06 | 2015-03-18 | 北京信威通信技术股份有限公司 | 一种用于时分同步系统的gps辅助的移动终端切换方法 |
JP2015053650A (ja) * | 2013-09-09 | 2015-03-19 | 京セラ株式会社 | 無線通信システム |
CN106686665A (zh) * | 2015-11-09 | 2017-05-17 | 北京信威通信技术股份有限公司 | 增加切换距离的方法及装置 |
CN106686665B (zh) * | 2015-11-09 | 2019-12-17 | 北京信威通信技术股份有限公司 | 增加切换距离的方法及装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1890398A9 (en) | 2011-05-11 |
EP1890398A1 (en) | 2008-02-20 |
CN101194444B (zh) | 2012-01-11 |
US20090137250A1 (en) | 2009-05-28 |
EP1890398B1 (en) | 2013-08-21 |
EP1890398A4 (en) | 2011-05-18 |
US8068839B2 (en) | 2011-11-29 |
JPWO2006131977A1 (ja) | 2009-01-08 |
JP4485573B2 (ja) | 2010-06-23 |
CN101194444A (zh) | 2008-06-04 |
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