WO2006106615A1 - 制御装置、移動局および移動通信システム並びに制御方法 - Google Patents
制御装置、移動局および移動通信システム並びに制御方法 Download PDFInfo
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- WO2006106615A1 WO2006106615A1 PCT/JP2006/306111 JP2006306111W WO2006106615A1 WO 2006106615 A1 WO2006106615 A1 WO 2006106615A1 JP 2006306111 W JP2006306111 W JP 2006306111W WO 2006106615 A1 WO2006106615 A1 WO 2006106615A1
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- 238000010295 mobile communication Methods 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 144
- 238000004891 communication Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 10
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 30
- 230000008054 signal transmission Effects 0.000 description 28
- 238000010586 diagram Methods 0.000 description 18
- 238000012545 processing Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012217 deletion Methods 0.000 description 2
- 230000037430 deletion Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 241001522296 Erithacus rubecula Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
Classifications
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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
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
- H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Definitions
- Control device mobile station, mobile communication system, and control method
- the present invention relates to a control device, a mobile station, a mobile communication system, and a control method.
- a scheduling algorithm at the time of handover for example, there is an algorithm that performs scheduling by only one connected cell (sector) as a scheduling at the time of hard handover. At a certain moment, only one of the users is connected, and at a certain moment, it moves to the next sector. Therefore, there is only one cell (sector) at a certain moment, so there is one link. In this case, the cell (sector) to be scheduled is changed by switching the handover. That is, control over multiple cells (sectors) is not required, and control similar to scheduling that does not consider handover is performed.
- a scheduling at the time of soft handover there is an algorithm that performs scheduling in consideration of a traffic class in an upper station (for example, see Non-Patent Documents 1 and 2). For example, two base stations and an upper station that controls these two base stations are provided, and scheduling is performed in the upper station.
- a plurality of sectors transmit simultaneously using different scrambling codes for sector identification. The mobile station despreads the signals transmitted by each sector power independently using the scramble code of each sector and combines them.
- Non-Patent Document 2 M. Kazmi, et. Al., "Scheduling Algorithms for Soft Handoff in Cellular Packet CDMA," IEEE PIMRC2000, pp.671-675, Sept. 2000.
- Non-Patent Document 3 3GPP TR 25.848 V4.0.0 (2001-03)
- Non-Patent Document 4 A. Jalali, R. Padovani, R. Pankaj, "Data Throughput of CDMA- HDR a High Efficiency-High Data Rate Personal Communication Wireless System," IEEE VTC2000, pp.1854- 1858, 2000
- the present invention provides a control device, a mobile station, a mobile communication system, and a control method capable of improving the scheduling control delay at the time of soft handover and improving the reception quality at the time of soft handover.
- the challenge is to do.
- the control device of the present invention is a control device that performs packet communication with a mobile station and divides a covered area into a plurality of sectors for control.
- a transmission allocating means for selecting at least two transmission sectors to be transmitted to the mobile station based on the reception quality notified from the station and allocating transmission to the mobile station;
- transmitting means for transmitting to the mobile station using the same scramble code.
- the mobile station of the present invention is a mobile station that performs packet communication with a base station, the reception quality measuring unit that measures the reception quality for each sector covered by the base station, Sector selection means for selecting a transmission sector based on reception quality, notification means for notifying the base station of the measured reception quality, and the same scramble code for sector identification of the received signal from the transmission sector are used.
- the reception quality measuring unit that measures the reception quality for each sector covered by the base station
- Sector selection means for selecting a transmission sector based on reception quality
- notification means for notifying the base station of the measured reception quality
- the same scramble code for sector identification of the received signal from the transmission sector are used.
- One of the features is that it is equipped with a receiving means.
- the mobile communication system of the present invention is a mobile communication system comprising a mobile station and a control device that performs packet communication with the mobile station, wherein the control device is a mobile station. Based on the notified reception quality, at least two transmission sectors to be transmitted to the mobile station are selected, transmission allocation means for allocating transmission to the mobile station, and the transmission sector power is also sector identification. Transmitting means for transmitting to the mobile station using the same scramble code for the mobile station, the mobile station measuring reception quality for each sector covered by the base station, and Sector selection means for selecting a transmission sector based on the reception quality, a notification means for notifying the base station of the measured reception quality, and the same scramble code for sector identification of the transmission sector power reception signal.
- One of the features is that it is equipped with a receiving means that receives and uses it.
- the control method of the present invention is a control method in a mobile communication system comprising a mobile station and a base station that performs packet communication with the mobile station.
- a reception quality measurement step for measuring the reception quality for each sector to be covered; a sector selection step for selecting a transmission sector based on the reception quality; and a notification step for notifying the base station of the measured reception quality.
- the base station selects at least two transmission sectors to be transmitted to the mobile station based on the reception quality notified from the mobile station, and performs transmission allocation for performing transmission allocation to the mobile station.
- a control device capable of improving the scheduling control delay at the time of soft handover and improving the reception quality at the time of soft handover.
- the method can be realized.
- FIG. 1 is a schematic diagram showing a mobile communication system according to an embodiment of the present invention.
- FIG. 2 is a partial block diagram showing a base station according to an embodiment of the present invention.
- FIG. 3 is a partial block diagram showing a mobile station that works in one embodiment of the present invention.
- FIG. 4A is a flowchart showing the operation of the mobile station according to one embodiment of the present invention.
- FIG. 4B is a flowchart showing the operation of the base station according to one embodiment of the present invention.
- FIG. 5 is an explanatory diagram showing soft handover.
- FIG. 6A is an explanatory diagram showing notification of a scramble code.
- FIG. 6B is an explanatory diagram showing notification of a scramble code.
- FIG. 8 is an explanatory diagram showing synthesis of received signals.
- FIG. 9 is a flowchart showing the operation of the base station according to one embodiment of the present invention.
- FIG. 10 is a flowchart showing the operation of the base station according to one embodiment of the present invention.
- FIG. 11 is a flowchart showing the operation of the base station according to one embodiment of the present invention.
- FIG. 12 is a partial block diagram showing a base station that works in one embodiment of the present invention.
- FIG. 13 is a partial block diagram showing a mobile station according to an embodiment of the present invention.
- FIG. 14A is a flowchart showing the operation of the mobile station according to one embodiment of the present invention.
- FIG. 14B is a flowchart showing the operation of the base station according to one example of the present invention.
- FIG. 15A is an explanatory diagram showing a common pilot channel using orthogonal sequences.
- FIG. 15B is an explanatory diagram showing a dedicated pilot channel.
- FIG. 16 is a partial block diagram showing a base station that works in one embodiment of the present invention.
- FIG. 17 is a flowchart showing the operation of the mobile communication system according to one embodiment of the present invention.
- FIG. 18 is an explanatory diagram showing frequency block allocation to a handover user.
- FIG. 19 is an explanatory diagram showing frequency block allocation to a handover user.
- FIG. 20A is an explanatory diagram showing a transmission method of information indicating reception quality.
- FIG. 20B is an explanatory diagram showing a method for transmitting information indicating reception quality.
- FIG. 20C is an explanatory diagram showing a transmission method of information indicating reception quality.
- the mobile communication system includes a base station 100 and a mobile station 200 capable of wireless communication with the base station 100.
- the mobile station 200 includes terminal devices having a wireless communication function, for example, terminal devices 200, 200, 200, 200, and 200.
- the mobile communication system performs packet scheduling at high speed when performing handover between a plurality of sectors in the same base station.
- the base station 100 includes a control unit 102, a signal generation / transmission unit 104 and a signal generation / transmission unit 104 connected to the control unit 102, and divides a cell into a plurality of sectors. Sector boundary
- the user for example, the terminal device 200 performs at least one of soft handover and fast sector selection between two sectors.
- the control unit 102 performs high-speed sector selection and determines an optimum sector.
- Control unit 10
- 2 is to perform high-speed packet scheduling and select a transmission user when soft handover is performed for users across multiple sectors in the downlink.
- the signal generation and transmission units 104 and 104 generate signal based on the control of the control unit 102.
- the control unit 102 determines to perform transmission from both sector signals, the signal generation and transmission units 104 and 104 transmit signals.
- high-speed sector selection is a control method in which reception quality in two sectors is measured, and an optimum sector is selected and transmitted based on the measured reception quality. For example, the sector with the better reception quality is selected and transmitted.
- high-speed packet scheduling The ring is a control method for measuring reception quality for a plurality of users in a certain sector, and selecting and transmitting an optimum user based on the measured reception quality. For example, transmission is performed at a certain moment only for the user having the best reception quality.
- the mobile communication system since the high-speed sector selection and the high-speed packet scheduling are controls based on the reception quality, the mobile communication system according to the present embodiment combines both the controls based on the reception quality. For example, when packet scheduling processing is performed first and high-speed sector selection is performed, when packet scheduling is performed first and soft node over is performed, packet scheduling is performed when high-speed sector selection is performed first. Each case will be described below.
- the mobile communication system performs high-speed sector selection after performing packet scheduling.
- the handover user is subject to scheduling in all sectors.
- transmission is also performed for the sector force to which transmission is assigned.
- the optimum sector is selected and transmitted only when transmission assignment is performed simultaneously in a plurality of sectors.
- base station 100 controls a cell by dividing it into three sectors, for example, sector 1, sector 2, and sector 3.
- Base station 100 divides the cell into a plurality of sectors. The same applies to the control.
- the base station 100 as a control device that works in the embodiment.
- Sector 1 scheduling control unit 108 Sector 2 scheduling control unit 108
- a transmission sector determination unit 112 as a transmission allocation unit connected to the information collection unit 110, a scramble code allocation unit 114 connected to the transmission sector determination unit 112, and a transmission connected to the scramble code allocation unit 114
- Signal generation and transmission units 104, 104, and 104 are provided as means.
- the signal generation and transmission units 104, 104, and 104 have the same configuration, and are scrambled.
- a spreading unit 118 connected to the allocating unit 114, and an OFDM signal generating unit 116 and a transmitting unit 120 connected to the spreading unit 118.
- 3Scheduling control unit 108 information collection unit 110, transmission sector determination unit 112 and
- Rumble code assigning section 114 constitutes control section 102. Also, the sector 1 scheduling control unit 108, the sector 2 scheduling control unit 108, and the sector 3 scheduling control unit
- the control unit 108 functions as a scheduling unit.
- Sector 1 scheduling control unit 108 sector 2 scheduling control unit 108 and
- Max CIR for example, see Non-Patent Document 3
- proportional fairness for example, see Non-Patent Document 4
- the information collection unit 110 collects information indicating the user to which the input transmission is assigned and inputs the information to the transmission sector determination unit 112.
- Transmission sector determining section 112 determines a sector to transmit to the handover user, and inputs the result to scramble code assigning section 114. In this case, when it is determined that only one sector is allocated as a transmission sector, the transmission sector determination unit 112 inputs information indicating the sector to the scramble code allocation unit 114.
- the transmission sector determination unit 112 determines to allocate a plurality of sectors as transmission sectors, the transmission sector determination unit 112 determines an optimum sector among the plurality of sectors, and scrambles the information indicating the sector. Input to the assigning unit 114.
- Scramble code assigning section 114 inputs a scramble code to spreading section 118 of signal generating and transmitting section 104 corresponding to the input sector to be transmitted.
- OFDM signal generation section 116 generates an OFDM signal based on transmission data.
- Spreading section 118 spreads the input OFDM signal using the input scramble code, and inputs it to transmitting section 120.
- Transmitting section 120 performs IFFT processing and the like on the spread OFDM signal.
- the mobile station 200 which is effective in the present embodiment, has a common pilot channel through which each sector force is transmitted.
- An input reception quality measurement unit 202 and a notification unit 204 connected to the reception quality measurement unit 202 are provided.
- Reception quality measurement section 202 measures reception quality, for example, reception power, reception SINR, etc. using, for example, a common pilot channel in which each sector power is also transmitted, and inputs the result to notification section 204.
- Notification section 204 notifies base station 100 of the information indicating the received reception quality.
- Reception quality measuring section 202 measures reception quality based on the common pilot channel from each sector (step S402).
- notification section 204 transmits information indicating the measured reception quality to each sector of base station 100 (step S404).
- base station 100 Next, the operation of base station 100 will be described with reference to FIG. 4B.
- the sector 1 scheduling control unit 108 and the sector 2 scheduling control unit 108 perform the scheduling process independently based on the received reception quality (steps).
- the transmission sector determination unit 112 determines a sector to be transmitted to the handover user (step S410), and determines whether a plurality of sectors have been selected (step S412).
- transmission sector determination section 112 selects an optimal sector based on, for example, reception quality, and assigns information indicating the sector to a scramble code. Input to part 114.
- the scramble code allocating unit 114 selects a scramble code from among the scramble codes assigned to the inputted sector and inputs the scramble code to the spreading unit 118 of the signal generation / transmission unit 104. Trust The signal generation / transmission unit 104 spreads and transmits the scramble code input by the scramble code assignment unit 114 (step S414).
- transmission sector determining section 112 transmits information indicating the sectors as a scramble code allocating section. Enter in 114.
- Scramble code assigning section 114 selects a scramble code from the strength of the scrambling code assigned to the input sector, and inputs the scramble code to spreading section 118 of signal generating / transmitting section 104.
- the signal generation / transmission unit 104 spreads and transmits the scramble code input from the scramble code allocation unit 114 (step S416).
- the reception quality of each of the two sectors is measured, and scheduling is performed in the two sectors. Therefore, the optimum transmission user is selected using the information of each sector. can do.
- the sector 1 scheduling control unit 108 and the sector 2 scheduling control unit 108 in the power base station described for the case where the OFDM scheme is applied are described.
- the same communication method can be obtained.
- the mobile communication system performs soft handover after performing packet scheduling.
- the handover user is the target of scheduling in all sectors.
- transmission is performed from the sector carrier to which transmission allocation has been performed.
- multi-sector power transmission is performed.
- transmission allocation is performed only in one sector, it is not transmitted.
- the base station 100 as a control device according to the present embodiment has the same configuration as the base station described in the first embodiment, the description thereof is omitted.
- the base station 100 which is effective in the present embodiment is different from the base station described in the first embodiment in the functions of the transmission sector determination unit 112 and the scramble code allocation unit 114.
- Transmission sector determining section 112 determines a sector to transmit to the handover user, and inputs the result to scramble code allocating section 114. In this case, when only one sector is determined as a transmission sector, the transmission sector determination unit 112 does not transmit to the scramble code allocation unit 114 in order to make non-transmission. In addition, when a plurality of sectors are determined as transmission sectors, the transmission sector determination unit 112 inputs information indicating the determined sectors to the scramble code allocation unit 114.
- the reception quality from sector 1 decreases as mobile station 200 approaches the area power covered by sector 1 closer to the area covered by sector 2. On the other hand, the mobile station 200 0 area power covered by sector 1
- the reception quality from sector 2 improves as the area covered by sector 2 gets closer.
- the reception quality from sector 1 and the reception quality from sector 2 cross at the boundary area between the area covered by sector 1 and the area covered by sector 2.
- the transmission sector determination unit 112 determines that the mobile station is located in an area near the position where the reception quality from the sector 1 and the reception quality from the sector 2 are the same. And sector 2 is determined as the transmitting sector. For example, when mobile station 200 moves from sector 1 to sector 2, thresholds (soft handover addition threshold and soft handover deletion threshold) that indicate the difference between the reception quality from sector 1 and the reception quality from sector 2 are set in advance. However, if the value is below the threshold, sector 1 and 1 Sector 2 is determined as the transmitting sector.
- the soft-node-over tracking threshold indicates the value obtained by subtracting the reception quality from sector 2 from the reception quality from sector 1
- the soft handover deletion threshold indicates the reception quality from sector 2 The value obtained by subtracting the reception quality from 1.
- the two threshold values may be the same or different.
- the scramble code assigning unit 114 inputs information indicating the scramble code to the spreading unit 118 of the signal generation / transmission unit 104 corresponding to the input plurality of sectors. In this case, the scramble code assigning unit 114 inputs information indicating the scramble code being used to the spreading unit 118 of the signal generation / transmission unit 104 corresponding to the handover source sector, for example, the sector 1.
- the scramble code allocating unit 114 also transmits information indicating the same scramble code as the scramble code used in the handover source sector to the spreading unit of the signal generation / transmission unit 104 corresponding to the sector to which the handover is over, for example, sector 2.
- each sector holds information on scramble codes used in other sectors in advance.
- the information collecting unit 110 includes the sector 1 scheduling control unit 108, the sector 2 scheduling control unit 108, and the sector 3 scheduling.
- the single ring control unit 108 power is also used in each sector.
- Transmission sector determining section 112 inputs information on the scramble code used together with information on the sector to be transmitted to scramble code assignment section 114.
- the scramble code allocating unit 114 transmits information indicating the same scramble code as the scramble code used in the handover source sector that is currently communicating, to the signal generation / transmission unit 104 corresponding to the sector to which the handover is performed. Is input to the diffusion unit 118.
- the scramble code that is tentatively used in the handover source sector is tentatively used only during the soft handover, that is, in the area where the soft handover is performed. Used in the sector.
- the scramble code assigning unit 114 inputs information indicating the scramble code that can be used in the handover destination sector to the spreading unit 114. [0080] Further, each sector is used in other sectors and does not hold the information on the scramble code, and the mobile station 200 bases the information indicating the reception quality and the information indicating the scramble code used. You may make it notify to a station.
- the mobile station 200 transmits information on the scramble code being used to the scheduling control unit 108 of each sector in addition to the information indicating the reception quality.
- the subsequent control is the same as the control described with reference to FIG. 6A.
- the same data is transmitted from each sector, for example, sectors # 1 and # 2, and soft compiling is performed in mobile station 200.
- the mobile station 200 can combine the signals as desired signals. By doing so, the reception quality in the mobile station 200 can be improved.
- mobile station 200 is the same as the operation of the mobile station described in the first embodiment, and thus the description thereof is omitted.
- base station 100 The operation of base station 100 will be described with reference to FIG.
- reception quality measurement section 202 of mobile station 200 may measure the reception quality after combining two sectors, for example, reception power and reception SINR, and transmit them to base station 200.
- information indicating the reception quality after combining two sectors is received by the base station 100 and input to the sector 1 scheduling control unit 108 and the sector 2 scheduling control unit 108.
- sector 1 scheduling control section 108 and sector 2 scheduling control section 108 perform scheduling processing based on the received reception quality (step S80). 4) 0
- the information collection unit 110 collects information on the selected user and scramble code information used in each sector.
- the transmission sector determination unit 112 determines a sector to be transmitted to the handover user (step S806), and determines whether or not a plurality of sectors have been selected (step S808).
- transmission sector determining section 112 inputs information indicating the selected sector to scramble code assigning section 114.
- the scramble code assigning unit 114 inputs information indicating the scramble code being used to the spreading unit 118 of the signal generation / transmission unit 104 corresponding to the handover source sector, for example, the sector 1.
- the scramble code allocating unit 114 also transmits information indicating the same scramble code as that used in the handover source sector to the spreading unit 11 of the signal generation and transmission unit 104 corresponding to the sector to which the handover is over, for example, the sector 2.
- the signal generation and transmission units 104 and 104 are input by the scramble code allocation unit 114.
- the mobile station 200 receives a reception signal having a transmission sector power at the reception unit (not shown) using the same scramble code for sector identification.
- transmission sector determining section 112 Information indicating the sector is not input to the scramble code assignment unit 114. That is, no transmission is performed (step S814).
- transmission is not performed because the quality may not be maintained even if the sector power is transmitted.
- the same communication method can be obtained.
- the mobile communication system performs soft handover after performing packet scheduling.
- the handover user is the target of scheduling in all sectors.
- transmission is performed from the sector carrier to which transmission allocation has been performed.
- transmission allocation is performed in at least one sector, transmission is performed from all sector cards.
- base station 100 controls a cell by dividing it into three sectors, for example, sector 1, sector 2 and sector 3, base station 100 divides the cell into a plurality of sectors. The same applies to the case of control.
- the base station 100 serving as a control device that works in the present embodiment has the same configuration as the base station described in the second embodiment, a description thereof is omitted.
- the base station 100 which is effective in the present embodiment differs from the base station described in the second embodiment in the function of the transmission sector determination unit 112.
- Transmission sector determining section 112 determines a sector to transmit to the handover user, and inputs the result to scramble code assigning section 114. In this case, if the transmission sector determination unit 112 determines to allocate at least one sector as a transmission sector, the transmission sector determination unit 112 inputs information indicating all sectors to the scramble code allocation unit 114.
- Scramble code assigning section 114 inputs information indicating a scramble code to spreading section 118 of signal generating and transmitting section 104 corresponding to the input sector.
- the scramble code assigning unit 114 inputs information indicating the scramble code being used to the spreading unit 118 of the signal generation / transmission unit 104 corresponding to the handover source sector, for example, the sector 1.
- the scramble code allocating unit 114 corresponds to information indicating the same scramble code as that used in the handover source sector, for example, a sector other than the sector that is the node of the handover destination.
- Signal generation and transmission unit 104 Input to the spreading unit 118.
- the scramble code allocating unit 114 inputs information indicating the scramble code assigned to the handover destination sector to the spreading unit 114.
- base station 100 The operation of base station 100 will be described with reference to FIG.
- sector 1 scheduling control section 108 and sector 2 scheduling control section 108 perform scheduling processing based on the received reception quality (step S90).
- the information collection unit 110 collects information on the selected user and scramble code information used in each sector.
- the transmission sector determination unit 112 determines a sector to be transmitted to the handover user (step S906), and determines whether or not at least one sector has been selected (step S908).
- transmission sector determining section 112 inputs information indicating all sectors, for example, sector 1 and sector 2, to scramble code allocating section 114.
- the scramble code assigning unit 114 inputs information indicating the scramble code to be used to the spreading unit 118 of the signal generation / transmission unit 104 corresponding to the handover source sector, for example, sector 1.
- the scramble code allocating unit 114 transmits information indicating the same scramble code as that used in the handover source sector to the signal generation / transmission unit 104 corresponding to the sector to which the node is over, for example, the sector 2.
- the signal generation and transmission units 104 and 104 are input by the scramble code allocation unit 114.
- the mobile station 200 receives a reception signal having a transmission sector power at the reception unit (not shown) using the same scramble code for sector identification.
- step S908 when at least one sector is not selected, that is, when no sector is selected (step S908: NO), transmission is not performed (step S914).
- the same communication method can be obtained.
- the mobile communication system performs soft handover after performing packet scheduling.
- the handover user is the target of scheduling in all sectors.
- transmission is performed from the sector carrier to which transmission allocation has been performed.
- the description will be given of the case where the base station 100 controls the cell by dividing it into three sectors, for example, sector 1, sector 2, and sector 3.
- the base station 100 divides the cell into a plurality of sectors. The same applies to the case of control.
- the base station 100 as a control device that works in the present embodiment has the same configuration as the base station described in the second embodiment, the description thereof is omitted.
- the base station 100 which is effective in the present embodiment differs from the base station described in the second embodiment in the function of the transmission sector determination unit 112.
- Transmission sector determining section 112 determines a sector to transmit to the handover user, and inputs the result to scramble code assigning section 114. In this case, when the transmission sector determination unit 112 determines to allocate only one sector as a transmission sector, the transmission sector determination unit 112 inputs information indicating the allocated sector to the scramble code allocation unit 114.
- transmission sector determination section 112 determines to allocate a plurality of sectors as transmission sectors, information indicating those sectors is input to scramble code allocation section 114.
- Scramble code assigning section 114 inputs information indicating a scramble code to spreading section 118 of signal generating and transmitting section 104 corresponding to the input sector.
- the scramble code assigning unit 114 inputs information indicating the scramble code being used to the spreading unit 118 of the signal generation / transmission unit 104 corresponding to the handover source sector, for example, the sector 1.
- the scramble code assigning unit 114 transmits information indicating the same scramble code as that used in the handover source sector to the signal generation / transmission unit 104 corresponding to the sector of the node over, for example, the sector 2 Input to the spreading unit 118.
- the scramble code assignment unit 114 inputs a scramble code that can be used in the handover destination sector to the spreading unit 114.
- base station 100 The operation of base station 100 will be described with reference to FIG.
- reception quality reception quality of each sector, for example, reception power, reception SINR may be used, or reception quality after two-sector combination, for example, reception power, reception SINR may be used.
- the optimum sector for example, the reception quality with the better reception quality, for example, reception power or reception SINR may be used.
- sector 1 scheduling control section 108 and sector 2 scheduling control section 108 perform scheduling processing based on the received reception quality (step S 10
- the information collection unit 110 collects information on the selected user and information on the scramble code used in each sector.
- the transmission sector determination unit 112 determines a sector to be transmitted to the handover user (step S 1006), and determines whether a plurality of sectors have been selected (step S 1008).
- transmission sector determining section 112 inputs information indicating the selected sector to scramble code assigning section 114.
- the scramble code allocating unit 114 inputs information indicating the scramble code being used to the spreading unit 118 of the signal generating / transmitting unit 104 corresponding to the handover source sector, for example, the sector 1.
- the scramble code allocating unit 114 also transmits information indicating the same scramble code as that used in the handover source sector to the spreading unit of the signal generation and transmission unit 104 corresponding to the handover destination sector, for example, sector 2.
- the code is spread by the scramble code input by the bull code assigning unit 114, and at least two sector forces are transmitted (step S1012).
- the mobile station 200 receives the received signal from the transmission sector at the receiving unit (not shown) using the same scramble code for sector identification.
- step S1008 NO
- the transmission sector determination unit 112 inputs information indicating the sector to the scramble code allocation unit 114.
- Scramble code assigning section 114 selects a predetermined scramble code from among the scramble codes assigned to the input sector, and inputs information indicating the scramble code to signal generating / transmitting section 104.
- the signal generation / transmission unit 104 spreads and transmits the scramble code input by the scramble code assignment unit 114 (step S 1014).
- the same communication method can be obtained.
- packet scheduling is performed after high-speed sector selection is performed.
- the mobile station 200 selects an optimum sector based on the measured reception quality.
- the base station 100 performs packet scheduling in the sector determined by the mobile station 200.
- the base station 100 as a control device that works in the present embodiment omits the transmission sector determination unit 112 in the base station described in the first example, and the information collection unit 110 And a scramble code assigning unit 114 are connected.
- Sector 1 scheduling control unit 118 sector 2 scheduling control unit 118 and
- Scheduling control unit 118 selects sector to be described later transmitted from the mobile station. Based on the information, it is confirmed whether or not the own sector corresponds to the transmitting sector, and when it corresponds to the transmitting sector, scheduling is performed by determining a user who performs transmission allocation based on the various algorithms described above. The result is input to the information collecting unit 110.
- the information collection unit 110 collects information indicating the user to which the input transmission is assigned and inputs the information to the scramble code assignment unit 114.
- Scramble code assigning section 114 inputs the scramble code to spreading section 118 of signal generating and transmitting section 104 corresponding to the input sector to be transmitted.
- the mobile station 200 includes a reception quality measurement unit 202 to which a common pilot channel to which each sector force is transmitted is input, and a sector selection unit connected to the reception quality measurement unit 202
- Reception quality measuring section 202 measures the reception quality using, for example, a common pilot channel to which each sector force is also transmitted, and inputs the result to sector selection section 206.
- the sector selection unit 206 selects an optimum sector based on the input reception quality, and notifies the selected sector (sector selection information) together with information indicating the reception quality.
- the received reception quality is the optimal sector reception quality, for example, reception power and reception SINR.
- Notification section 204 notifies the base station of information indicating the input sector, for example, information indicating the sector number and its reception quality.
- Reception quality measuring section 202 measures reception quality based on the common pilot channel from each sector (step S1302).
- the sector selection unit 206 selects an optimum sector based on the reception quality (step
- the notification unit 204 sends the selected sector and information indicating the reception quality to the base station 10.
- the sector 1 scheduling control unit 108 and the sector 2 scheduling control unit 108 determine whether or not the own sector is the selected sector (step S1310).
- the sector 1 scheduling control unit 108 and the sector 2 scheduling control unit 108 are identical to each other.
- step S1310 If it is determined that the own sector is the selected sector (step S1310: YES), scheduling processing is performed (step S1312).
- the information collection unit 110 collects information on the selected user and scramble code information used in the selected sector, and the scramble code allocation unit 114 is based on the collected information. Then, a scramble code is assigned and input to the signal generation and transmission unit 104 (step S1314).
- the signal generation / transmitting units 104 and 104 are expanded by the scramble code input by the scramble code assigning unit 114.
- the mobile communication system when the user with the best reception quality is selected in the mobile station, control is not required when straddling sectors, and control is easy. .
- the sector it is only necessary to check whether or not the own sector is the selected sector.
- the throughput of the handover user can be improved.
- the information fed back from mobile station 200 to base station 100 can be reduced.
- Sector 3 Scheduling controller 108 can be applied to other communication methods. The same effect can be obtained.
- the mobile communication system according to the present embodiment uses a common slot channel that is orthogonal between sectors in consideration of the features of the above-described embodiment.
- orthogonal signals are used in the signals of sectors # 1 and # 2, and orthogonalized pilot channels and data channels are shown.
- the data channel is the same data and is received by soft compiling.
- the data channel is received with twice the reception power.
- the common pilot channel is received separately when it is not orthogonalized. For example, when receiving a common pilot channel from sector # 1, the common pilot channel from sector # 2 becomes interference, and when receiving a common pilot channel from sector # 2, sector # 1 power Common pilot channels become interference. For this reason, the reception quality is not good.
- the reception quality of # 1 common pilot channel and common pilot channel from sector # 2 is improved. Therefore, it can be used for reception quality measurement.
- a dedicated pilot channel may be used as a pilot channel in addition to the common pilot channel.
- a sector-specific orthogonal sequence is used for this dedicated pilot channel.
- the dedicated pilot channel can avoid interference from adjacent sectors in the same cell. Inter-sector interference in the dedicated pilot channel can be avoided, improving channel estimation accuracy. This is particularly advantageous for simultaneous transmissions related to high speed sector selection and soft compiling.
- a specific usage of the orthogonal sequence unique to the sector is as follows, for example.
- User # 1 located at the edge or edge of the sector i.e. fast sector selection or Users who perform soft connoing
- User # 2 who does not perform fast sector selection or soft compiling, can perform channel estimation by using each pie symbol. In other words, it is not necessary to perform despreading.
- the dedicated pilot channel may be covered.
- the power of the first embodiment can be applied to the fifth embodiment.
- the base station 100 as a control device that works in the present embodiment includes a scheduling control unit 108, a scramble code assignment unit 114 connected to the scheduling control unit 108, and a signal connected to the scramble code assignment unit 114.
- the signal generation and transmission units 104, 104, and 104 have the same configuration, and a scrambling record
- a allocating section 118 connected to the allocating section 114, an OFDM signal generating section 116 and a transmitting section 120 connected to the spreading section 118, and a pilot signal generating section 122 connected to the transmitting section 120.
- the scheduling control unit 108 is configured to move all the mobile stations located in a plurality of sectors in the same base station. Based on the reception quality at the mobile station, the mobile station is allocated to the frequency block obtained by dividing the allocated frequency band, and the mobile station to be transmitted is selected. That is, the scheduling control unit 108 assigns a mobile station to a frequency block obtained by dividing the assigned frequency band based on reception quality in a plurality of sectors in the same base station, and selects a mobile station that performs transmission. That is, a priority function for use in each frequency block is measured for all users located in a sector in the same base station, and the frequency block is transmitted to the user based on the measured priority function. Make an assignment.
- the pilot signal generator 122 generates an orthogonal pilot channel common to the sectors described above. Further, the pilot signal generator 122 may generate a pilot channel that includes an individual pilot channel in addition to the common pilot channel.
- the mobile station 200 that is helpful in the present embodiment will be described. Since the mobile station 200 that is useful in the present embodiment has the same configuration as the mobile station described with reference to FIG. 3, the description thereof is omitted.
- the mobile station 200 uses the common pilot channel transmitted from the base station 100, in the reception quality measurement unit 202, to measure the received SINR after the soft compiling (step S1702).
- the mobile station 200 in the notification unit 204, receives the received SI after soft compiling.
- step S 1704 is notified.
- base station 100 performs packet scheduling in all sectors in the same base station in scheduling control section 108 (step S1706).
- the scheduling control unit 108 measures a priority function to be used for scheduling of each frequency block for all users located in all sectors in the same base station.
- Max CIR see, for example, Non-Patent Document 3
- proportional fairness for example, see Non-Patent Document 4
- the scheduling control unit 108 rearranges the measured priority functions in a predetermined order. For example, the scheduling control unit 108 rearranges the priority functions in descending order. For example, as shown in FIG. 19, the frequency block 1 of sector 0 in user B, the frequency block 3 of sector 0 in user C, the frequency block 2 in sector 0 in user A, and the frequency block 4 in sector 0 in user B are in this order. Become.
- scheduling control section 108 assigns users to frequency blocks in descending order of priority function.
- a frequency block is assigned to a handover user
- the handover user is Assigned.
- allocation is performed only when frequency blocks in the same frequency band are used simultaneously in the two sectors.
- a handover user is assigned only when a frequency block common to both sectors is assigned. As a result, frequency blocks having the same frequency band in each sector are allocated to the handover user.
- frequency block 1 in sector 0 is assigned to handover user B
- frequency block 1 in sector 1 is not assigned, so frequency block 1 in sector 1 is assigned to user B.
- the reception quality of each sector is code-multiplexed and transmitted in the same frame. In this way, reception quality for two sectors can be transmitted simultaneously.
- the reception quality of each sector may be time-multiplexed and transmitted alternately. For example, as shown in FIG. 20B, while keeping the time frame, one frame is halved to shorten the transmission time of the reception quality of each sector. Further, as shown in FIG. 20C, if the time of one frame is maintained and the reception quality of sector 1 is transmitted, the reception quality of sector 2 is transmitted in the next frame. By doing so, it is possible to prevent the quality of the control information from being degraded. Also, in this case, for frames for which reception quality is not sent, the reception quality transmitted last time is used.
- control across sectors can be performed in the same base station, so that a control delay from the base station to the upper station is reduced.
- scheduling control delay can be reduced, and high-speed packet scheduling can be performed.
- control device mobile station, mobile communication system, and control method according to the present invention can be applied to a mobile communication system that performs communication using IP packets.
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Abstract
Description
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Priority Applications (7)
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KR1020077023552A KR101222941B1 (ko) | 2005-03-31 | 2006-03-27 | 제어장치, 이동국, 이동통신 시스템, 및 제어방법 |
BRPI0609660-3A BRPI0609660A2 (pt) | 2005-03-31 | 2006-03-27 | controlador, estação móvel, sistema de comunicações móveis e método de controle |
AU2006231175A AU2006231175B2 (en) | 2005-03-31 | 2006-03-27 | Controller, mobile station, mobile communication system and control method |
EP06730059A EP1868394A4 (en) | 2005-03-31 | 2006-03-27 | CONTROL, MOBILE STATION, MOBILE COMMUNICATION SYSTEM AND CONTROL PROCEDURES |
US11/909,635 US8310984B2 (en) | 2005-03-31 | 2006-03-27 | Controller, mobile station, mobile communications system and control method |
CA002602696A CA2602696A1 (en) | 2005-03-31 | 2006-03-27 | Controller, mobile station, mobile communications system and control method |
CN2006800191568A CN101185353B (zh) | 2005-03-31 | 2006-03-27 | 控制装置、移动台和移动通信系统以及控制方法 |
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JP2005-105496 | 2005-03-31 | ||
JP2005241903A JP2006311475A (ja) | 2005-03-31 | 2005-08-23 | 制御装置、移動局および移動通信システム並びに制御方法 |
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EP (1) | EP1868394A4 (ja) |
JP (1) | JP2006311475A (ja) |
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CN (1) | CN101185353B (ja) |
AU (1) | AU2006231175B2 (ja) |
BR (1) | BRPI0609660A2 (ja) |
CA (1) | CA2602696A1 (ja) |
RU (1) | RU2409011C2 (ja) |
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WO (1) | WO2006106615A1 (ja) |
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WO2007072751A1 (ja) * | 2005-12-20 | 2007-06-28 | Sharp Kabushiki Kaisha | 送信機および送信方法 |
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KR100946921B1 (ko) | 2008-03-24 | 2010-03-09 | 에스케이 텔레콤주식회사 | 이동단말의 핸드오버 제어 방법 및 시스템 |
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KR20080002829A (ko) | 2008-01-04 |
RU2007135254A (ru) | 2009-05-10 |
CA2602696A1 (en) | 2006-10-12 |
US8310984B2 (en) | 2012-11-13 |
RU2409011C2 (ru) | 2011-01-10 |
AU2006231175A1 (en) | 2006-10-12 |
US20090201876A1 (en) | 2009-08-13 |
AU2006231175B2 (en) | 2010-04-08 |
BRPI0609660A2 (pt) | 2010-04-20 |
EP1868394A4 (en) | 2012-05-23 |
TWI293232B (ja) | 2008-02-01 |
CN101185353B (zh) | 2012-05-30 |
JP2006311475A (ja) | 2006-11-09 |
CN101185353A (zh) | 2008-05-21 |
AU2006231175A8 (en) | 2006-10-12 |
KR101222941B1 (ko) | 2013-01-17 |
TW200644683A (en) | 2006-12-16 |
EP1868394A1 (en) | 2007-12-19 |
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