WO2008041291A1 - Base station device - Google Patents
Base station device Download PDFInfo
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- WO2008041291A1 WO2008041291A1 PCT/JP2006/319532 JP2006319532W WO2008041291A1 WO 2008041291 A1 WO2008041291 A1 WO 2008041291A1 JP 2006319532 W JP2006319532 W JP 2006319532W WO 2008041291 A1 WO2008041291 A1 WO 2008041291A1
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- WIPO (PCT)
- Prior art keywords
- base station
- subchannels
- combination
- mobile station
- communication
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
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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
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a communication area such as OFDMA (Orthogonal Frequency Division Multiplexing Access) in which a frequency band to be used is divided into a plurality of subchannels and one or more subchannels are allocated to a plurality of mobile stations.
- OFDMA Orthogonal Frequency Division Multiplexing Access
- a frequency band to be used is divided into a plurality of subchannels and one or more subchannels are allocated to a plurality of mobile stations.
- the base station uses all of the used frequency band, and assigns subchannels to a plurality of mobile stations to transmit signals.
- a mobile station transmits a signal using a subchannel allocated to each mobile station by a base station and a designated modulation scheme and coding rate.
- the mobile station can increase the power spectral density and expand the communication area by reducing the transmission power to only the assigned subchannel band. However, by reducing the number of subchannels and narrowing the subchannel bandwidth, the user communication speed decreases.
- Patent Document 1 Japanese Translation of Special Publication 2003—513588
- Patent Document 2 Japanese Patent Laid-Open No. 2003-18117
- Patent Document 3 Japanese Patent Laid-Open No. 2004-214746 Disclosure of the invention
- An object of the present invention is to provide a technique capable of realizing improvement in communication speed by modulation scheme and subchannel assignment.
- the communication area is expanded.
- another object of the present invention is to select a suitable modulation scheme, coding rate, and number of subchannels based on a communication request of a mobile station and a transmission power of the mobile station as a criterion. It is to provide a technology capable of improving the speed and reducing the transmission power of the mobile station.
- the present invention employs the following means in order to achieve the above-described object.
- Ie book The invention relates to a base station apparatus that allocates one or more subchannels to a mobile station and performs uplink wireless communication with the mobile station using the one or more subchannels.
- An estimation unit that estimates the propagation environment of radio waves from the mobile station to the base station
- An interference amount calculation unit that calculates the interference amount from the received power at the base station
- the mobile station Based on the propagation environment, the amount of interference, and the specification conditions of the mobile station, the mobile station notifies the mobile station of the modulation scheme, coding rate, and number of subchannels to be used for transmission to the base station. And a determining unit that determines these.
- the determination unit of the present invention determines a modulation scheme, a code rate, and a number of subchannels that satisfy a communication requirement condition in transmission of the mobile station.
- the determination unit of the present invention determines a modulation scheme, a coding rate, and a number of subchannels that satisfy the required communication quality required based on the interference amount, the communication request condition, and the specification condition.
- the specification condition in the present invention includes a combination of a plurality of modulation schemes and coding rates that can be used in the mobile station,
- the determining unit calculates the number of subchannels satisfying the required communication quality for each combination of the plurality of modulation schemes and coding rates based on the propagation environment and the amount of interference. One to be notified to the mobile station is determined from the combination of the modulation scheme, the code rate and the number of subchannels.
- the transmission power is calculated when one of the combinations of the plurality of modulation schemes, the coding ratio, and the number of subchannels determined by the determination unit is applied. , Notified to the mobile station.
- the determination unit determines one of a combination of the plurality of modulation schemes, coding rates, and number of subchannels that satisfies the required communication quality and maximizes the communication speed.
- the determination unit according to the present invention is one of a combination of the plurality of modulation schemes, coding rates, and number of subchannels that satisfies the required communication quality and minimizes the transmission power of the mobile station. To decide.
- the determination unit follows a plurality of determination criteria having priority. To determine one of the combinations of the plurality of modulation schemes, code ratios and the number of subchannels.
- the priority given to the plurality of determination criteria is dynamically changed.
- the multiple criteria are, for example, “maximization of communication speed”, “observance of required communication speed”, “minimization of transmission power”, and “maximum number of usable subchannels”. There are at least two.
- the determination of the modulation scheme, the code rate and the number of subchannels in the present invention is performed periodically.
- the present invention corresponds to the first modulation method capable of high-speed wireless communication and the second modulation method capable of low-speed wireless communication, and subchannels of 1 or more and M or less have the capability of the wireless terminal.
- the first combination that is a combination of the first modulation scheme and the number of subchannels N (1 ⁇ N ⁇ M) 2
- the second combination which is a combination of the modulation method and the number of subchannels N '(1 ⁇ N ⁇ M)
- a radio base station comprising: a determination unit that selects the second combination when the output is small; and a notification unit that notifies the radio terminal of the selected combination is used.
- the combination selected by the determination unit is a combination that minimizes a transmission output among combinations of a modulation scheme that satisfies the required communication speed and the number of subchannels.
- the present invention corresponds to the first modulation method capable of high-speed wireless communication and the second modulation method capable of low-speed wireless communication, and subchannels of 1 or more and M or less have the capability of the wireless terminal.
- the first combination that is a combination of the first modulation scheme and the number of subchannels N (1 ⁇ N ⁇ M) is also the second modulation.
- a wireless base comprising: a determination unit that selects the second combination when the mobile phone is fast; and a notification unit that notifies the wireless terminal of the selected combination. Use the ground station.
- the combination selected by the determination unit is a combination that maximizes the communication speed among combinations of modulation schemes and the number of subchannels that are equal to or less than the predetermined transmission output.
- communication speed can be improved by selecting an appropriate modulation scheme, coding rate, and number of subchannels based on the communication request of the mobile station and the transmission power of the mobile station as a criterion. It becomes possible to reduce the transmission power of the mobile station.
- FIG. 1 is a diagram showing an embodiment of a mobile station that implements the present invention.
- FIG. 2 is a diagram showing an embodiment of a base station that implements the present invention.
- FIG. 3 is a diagram illustrating a specific example of information reported by a mobile station.
- FIG. 4 is a diagram for explaining a specific example of a modulation scheme and a code rate calculated by the present invention and the number of assigned subchannels.
- FIG. 5 is a diagram showing the number of subchannels that can be allocated and transmission power that change depending on the propagation loss (distance) between the mobile station and the base station.
- FIG. 6 is a diagram showing coverage that varies depending on the modulation scheme, code rate, and number of assigned subchannels.
- FIG. 7 is a flowchart showing an example of an operation for determining the modulation scheme, the code rate and the number of assigned subchannels of the present invention.
- FIG. 1 shows an embodiment (configuration example) of a mobile station (terminal device) according to the present invention
- FIG. 2 shows an embodiment (configuration example) of a base station device (multiple access system) according to the present invention.
- the mobile station 10 is a means for reporting to the base station a modulation scheme that can be used by the mobile station in the uplink, a code rate, and communication capability information such as maximum transmission power (transmitting unit 12). Is provided.
- the base station apparatus (base station) 20 includes a storage unit 24 that holds the modulation scheme, code rate, and maximum transmission power that can be used by the mobile station 10 reported from the mobile station 10.
- the base station 20 is notified to all mobile stations 10 located in the communication area (cell). Means for transmitting common signals (transmitting unit 22).
- the mobile station 10 includes a measuring unit 13 that measures the received power of the common signal broadcast from the base station 20, and a unit (transmitting unit 12) that reports the measured common signal received power to the base station 20.
- the base station 20 calculates the total loss (radio propagation environment) between the mobile station 10 and the base station 20 from the common signal received power reported from the mobile station 10 and the common signal transmission power transmitted by the base station 20.
- a calculation unit (propagation loss calculation unit 25) is provided.
- the base station 20 includes a received power measurement unit (measurement unit 23) that measures the total received power, and an interference calculation unit (interference amount) that calculates interference power (interference amount) from the total received power of the base station. And a calculator 26).
- the base station 20 is requested based on the calculated total loss, interference power (interference amount), the maximum transmission power reported from the mobile station 10, and the available modulation schemes and coding rates. From the desired power-to-interference power ratio (SINR), all the sub-assignments that can be assigned at each modulation scheme and code rate that the mobile station 10 can support An allocation subchannel number calculation unit 27 is provided that calculates the combination of the number of channels, the transmission power of the mobile station required when the number of subchannels is used, and the estimated communication speed.
- SINR power-to-interference power ratio
- the mobile station 10 When the mobile station 10 performs communication on the uplink, the mobile station 10 notifies the base station 20 of an access request including a communication request condition (communication speed or communication volume). Means (transmitter 12) are provided. The base station 20 determines the criteria used to determine the modulation scheme and coding rate to be assigned to the mobile station 10 and the number of subchannels according to the communication requirements of the mobile station 10 and the resources of the base station 20. A selection unit 28 is provided.
- the base station 20 determines the modulation scheme and code rate used by the mobile station 10 and the number of assigned subchannels according to the determination criterion given by the determination criterion selector 28. Judgment unit 29 is provided.
- the base station 20 includes means (a transmission unit 22) for notifying the mobile station 10 of the modulation scheme used by the mobile station 10, the coding rate, the number of subchannels, and the transmission power.
- the mobile station 10 includes means (transmitter 12) for transmitting a signal to the base station 20 using the notified modulation scheme, coding rate, number of subchannels, and transmission power.
- the base station can receive the capability information max including the modulation scheme and coding rate that the mobile station 10 can support and the maximum transmission power Tx.
- the base station 20 receives the report and holds it in the storage device unit 24.
- the mobile station 10 measures the received power of the common signal transmitted from the base station 20 in order to estimate the propagation environment of radio waves between the base station 20 and the mobile station 10, When communication is performed on the uplink, the received power measurement result and the requested communication speed are reported to the base station 20. The maximum transmit power can be reported at the same time.
- the base station 20 receives the communication request on the uplink of the mobile station 10 (the reception power measurement result of the common signal and the communication request condition (communication speed, maximum transmission power)), the base station 20 From the common signal transmission power from the base station 20, the total loss Lp between the base station 20 and the mobile station 10 is calculated. Further, the base station 20 determines the interference power (interference amount) Io at the base station 20, the maximum transmission power of the mobile station 10, and the required communication quality SINRj required for the combination j of the modulation scheme and coding rate.
- the number of subchannels Nj that can be assigned to V for the combination j of each modulation method and coding rate, and the transmission power Txj ( Nj) and the estimated communication speed Thj (Nj) are calculated using Equation 1 and Equation 2 below.
- Tx (N) N * SINR * L * 1 ( ⁇ Tx) ⁇ ⁇ ⁇ [Formula 1]
- Th (N) N * Th—sub ⁇ ⁇ ⁇ [Formula 2]
- Th_subj is the communication speed when using one subchannel when the combination j of the modulation scheme and the code rate is used.
- the base station 20 determines the modulation method to be used by the mobile station 10 according to the required communication speed of the mobile station 10 and the number of usable subchannels (number of unused subchannels). A criterion for determining a combination of an equation, a coding rate, and the number of subchannels is selected.
- determination criteria “maximization of communication speed”, “observance of required communication speed”, “minimization of transmission power”, “maximum number of usable subchannels”, and the like can be defined.
- a configuration where only one of these criteria is applied can be adopted.
- the base station 20 determines, based on the determination criteria, the combination J of the modulation scheme and coding rate to be used by the mobile station 10 and the number of allocated subchannels N (modulation scheme, code rate and subchannel). Number pair j
- One of the combinations is determined, and the mobile station 10 is notified of one of the combinations and the transmission power Tx (N) necessary to satisfy the communication quality when one of the combinations is applied.
- the priority order of the determination criteria is defined in the order of "observance of required communication speed" and "minimization of transmission power", for example, a plurality of modulation schemes, code ratios and the number of subchannels Of these combinations, those that meet the required communication speed are selected (extracted) according to the first priority. At this time, when a plurality of combinations are extracted, the combination that minimizes the transmission power is selected according to the second priority.
- the mobile station 10 uses the combination notified from the base station 20 (the combination J of the modulation scheme and the coding rate and the number N of subchannels) to notify the notified transmission power Tx ( N)) to communicate.
- the base station 20 periodically (periodically) assigns the modulation scheme, code rate, and number of subchannels used by the mobile station 10 for the uplink.
- FIG. 1 is a diagram illustrating an embodiment of a mobile station that implements the present invention.
- a mobile station 10 includes a reception unit 11 connected to a reception antenna 11A, a transmission unit 12 connected to a transmission antenna 12A, a measurement unit 13, and a control unit 14.
- the mobile station 10 when performing communication on the uplink, receives the common signal transmitted from the base station 20 at the reception unit 11 via the reception antenna 11A, and receives the common signal.
- the power is measured by measurement unit 13.
- the measurement result of the received power is given to the transmission unit 12.
- Control unit 14 is based on the received signal and includes a transmission signal (mobile station (wireless terminal, wireless terminal, etc.) including specification conditions (available modulation schemes and code rate, etc.) and communication requirements (communication speed, maximum transmission power, etc.). )) Is given to the transmitter 12.
- the transmission unit 12 transmits a report including the received power measurement result, the specification condition, and the communication request condition to the base station 20.
- FIG. 3 shows a report example of the mobile station 10 (mobile station # 1).
- the mobile station 10 transmits a report including the communication speed, the maximum transmission power, the modulation scheme and coding rate, and the wireless environment (the reception power measurement result of the common signal) to the base station 20.
- FIG. 2 is a diagram illustrating an embodiment of a base station that implements the present invention.
- the base station 20 includes a receiving unit 21 connected to the receiving antenna 21A, a transmitting unit 22 connected to the transmitting antenna 22A, a received power measuring unit 23, a storage unit 24, and a propagation loss calculation.
- a unit 25, an interference amount calculation unit 26, an allocation subchannel number calculation unit 27, a determination condition selection unit 28, an allocation subchannel determination unit 29, and a control unit 30 are provided.
- propagation loss calculation unit 25 corresponds to the estimation unit of the present invention
- allocation subchannel number calculation unit 27 and the allocation subchannel determination unit 29 correspond to the determination unit of the present invention.
- the base station 20 receives the uplink request (access request) from the mobile station 10 at the reception unit 21 via the reception antenna 21A.
- the uplink request includes the above-mentioned report ( Figure 2).
- the report (modulation method and coding rate, communication speed, common signal received power, etc.) is stored (stored) in the storage device unit 24.
- the propagation loss calculation unit 25 calculates the total loss Lp (propagation environment) between the mobile station 10 and the base station 20 from the received power measurement result included in the report and the common signal transmission power at the base station 20. Equivalent).
- the base station 20 measures the received power (total received power) of the received signal (uplink request) from the mobile station 10 by the received power measuring unit 23, and the interference power based on the measurement result (total received power). Io is measured (calculated) by the interference amount calculator 26.
- the base station 20 uses the total loss Lp, the measured interference power Io, and the maximum transmission power Tx reported from the mobile station 10 (terminal) (stored in the storage unit 24). , Each modulation
- the number of subchannels Nj that satisfies the required communication quality (SINR) and maximum transmission power for the combination j of the method and coding rate, and the transmission power Tx of the mobile station 10 required when each subchannel number Nj is applied (N) and the estimated communication speed Th (N) Calculate with The allocation subchannel number calculation unit 27 transmits the transmission power Tx (N) and the communication speed Th (
- FIG. 4 shows an example of calculation results of the number of subchannels N, transmission power Tx ( ⁇ ), and communication speed Th (N).
- the ratio (1: 2: 3) in the combination of the three types of modulation schemes and code rate used in the example is constant.
- the calculation result as shown in FIG. 4 is input from the allocation subchannel number calculation unit 27 to the allocation subchannel determination unit 29.
- the allocation subchannel determination unit 29 should be used by the mobile station 10 based on one or more determination criteria selected by the determination criterion selection unit 28 (selection conditions for a combination of modulation scheme, coding rate, and number of subchannels). Select (determine) the combination from the calculation results (j, Nj). The determined combination is given to the transmission unit 22 together with the necessary transmission power Tx (N), and a transmission signal including these is transmitted from the transmission antenna 22A to the mobile station 10.
- the type, number of types, and priority assigned to each determination criterion selected by the determination criterion selection unit 28 can be appropriately changed through control by the control unit 30, for example.
- the estimated communication speed Tx (N) is referred to for determining the combination when applying the criteria for communication speed.
- the “number of usable subchannels” increases or decreases according to the number of unused subchannels in the base station 20.
- the radio base station in FIG. 2 corresponds to a first modulation scheme (for example, 16QAM) capable of high-speed radio communication and a second modulation scheme (for example, QPSK) capable of low-speed radio communication.
- a first modulation scheme for example, 16QAM
- QPSK second modulation scheme
- Subchannels of M or less are used for wireless communication with mobile stations within the capacity of the wireless terminal (mobile station).
- both the first modulation scheme 16QAM and the second modulation scheme QPSK can be used. Assuming that the required communication speed is 0.8 [Mbps_], from Fig. 4, it is possible to select a combination of subchannels 4 and 5 using the modulation method QPSK and subchannels 2 to 5 using the modulation method QAM.
- sub-channel 2 has a transmission power 15.51 in 16QAM, but sub-channel 4 has a transmission power 13.03 in QPSK, and the required transmission power is small.
- the allocation subchannel determination unit 27 performs control so that the subchannel 4 is selected by QPSK and the selection result is notified from the transmission unit 22 to the mobile station.
- the combination of subchannels 4 and 5 in modulation scheme QPSK and subchannels 2 to 5 in modulation scheme QAM is selected with the minimum transmission output (here, subchannel 4 in QPSK). Then, the transmission output is minimized. That is, the lowest transmission output is used as the determination condition.
- an upper limit (for example, 16 dBm) can be set for the transmission output such as the maximum transmission output of the mobile station, and a combination of modulation scheme and number of subchannels can be selected.
- the determination unit 29 selects a combination of 5 subchannels using QPSK and controls the transmission unit 22 to notify the selection result to the mobile station.
- the number of subchannels is increased and a lower-speed modulation method is selected. As a result, the mobile station The communication speed can be increased.
- the combination of subchannels 1 to 5 with modulation method QPSK and subchannels 1 and 2 with modulation method QAM selects the one with the highest communication speed (here, subchannel 5 with QPSK). Is maximized. In other words, the highest communication speed is used as the judgment condition.
- Figure 5 shows the number of subchannels that change depending on the distance (total loss Lp) between the base station 20 and the mobile station 10 when one modulation method is used, and the transmission power of the mobile station 10 required at that time. This is a conceptual representation of the relationship. As shown in FIG. 5, as the distance between the base station 20 and the mobile station 10 becomes shorter (total loss becomes smaller), the required communication quality can be satisfied even if the number of subchannels increases. Thus, the communication speed can be improved by increasing the number of subchannels within the range where the required communication quality is satisfied according to the calculation result of the total loss.
- FIG. 6 conceptually shows the relationship between the distance (total loss) between the base station 20 and the mobile station 10 and the number of usable subchannels when a plurality of modulation schemes are used. .
- a modulation scheme with higher required communication quality SINR
- many subchannels can be used in a modulation scheme with lower required communication quality.
- “usable subchannels (maximum 5)” and “maximum communication speed” are used as judgment criteria. '' And ⁇ Minimize transmit power '' are applied, and priority is given in the order of ⁇ Usable subchannels (maximum 5) '', ⁇ Maximize communication speed '', and ⁇ Minimize transmit power ''.
- the maximum communication speed in the calculation result of FIG. 4 is “(16QAM 1/2) ⁇ 5 subchannel”, and this combination is assigned to mobile station # 1 (mobile station 10). This combination has a higher communication speed and lower transmission power than a combination using "(64QA M 1/2)".
- the propagation environment varies with time due to movement of the mobile station 10 or the like. For this reason, it is necessary to periodically (periodically) assign the modulation scheme used by the mobile station 10 for the uplink, the code rate, and the number of subchannels.
- FIG. 7 shows an operation flow in which the modulation scheme, coding rate, and number of subchannels used by the mobile station are determined according to the embodiment of the present invention.
- the base station 20 periodically performs the above calculation and determination according to the propagation environment of the mobile station 10, and determines the modulation scheme and code rate to be used by the mobile station 10. Determine the number of subchannels.
- step S1 in FIG. 7 the base station 20 (FIG. 3) receives the access request (uplink request) from the mobile station 10 by the reception antenna 21A and the reception unit 22.
- the base station 20 transmits a common signal from the transmission unit 22 and the transmission antenna 22A to the communication area (cell). This common signal is used by the mobile station 10 to measure the received power.
- the access request includes information including the received power as a report of the mobile station 10.
- step S2 the base station 20 determines, based on the report included in the access request, the communication request conditions (communication speed, etc.) of the mobile station 10, the radio environment (reception power of downlink common signals, etc.), and the specification conditions ( Identify the modulation method, coding rate, maximum transmission power, etc.). This process is performed, for example, by the control unit 30 and is used to determine a determination condition (determination criterion).
- step S3 the propagation loss calculation unit 25 receives the radio environment of the mobile station 10 (reception of the downlink common signal).
- the total loss Lp between the mobile station 10 and the base station 20 is calculated using power etc.
- step S4 the measurement unit 23 and the interference amount calculation unit 26 measure the interference state (interference amount) Io in the base station. Subsequently, the allocation subchannel number calculation unit 27 calculates the combination of the modulation scheme and coding rate that can be used in the mobile station 10 from the specification conditions of the mobile station 10, the interference amount Io at the base station 20, and the total loss Lp. Nj, the required transmission power Tx (N), and the estimated communication speed Th (N) corresponding to each of the subchannels are calculated. However, when the determination criterion related to the communication speed is not used as the determination criterion, the calculation of the estimated communication speed may be omitted.
- step S5 modulation scheme calculated by allocation subchannel number calculation unit 27 is determined by allocation subchannel determination unit 29 according to one or more determination criteria selected by determination criterion selection unit 28.
- the combination to be allocated to the mobile station 10 is selected from the combination of the code rate and the number of allocated subchannels, and is transmitted using the transmission unit 22 and the transmission antenna 22A. As a result, the mobile station 10 is notified of a signal including the modulation scheme, coding rate, and number of subchannels that the mobile station 10 should use in uplink communication.
- step S 6 the mobile station 10 (FIG. 1) receives the downlink communication signal from the base station 20 by the receiving unit 11.
- the received signal received by the receiving unit 11 is given to the control unit 14.
- the control unit 14 controls the transmission unit 12 to perform uplink communication with the modulation scheme and code rate reported from the base station 20 and the number of subchannels.
- the base station 20 performs steps S2 to S5 again after a predetermined time, and notifies the modulation scheme, coding rate, and number of subchannels according to the situation of the mobile station 10.
- the propagation loss between the base station 20 and the mobile station 10 in which the measurement result in the mobile station is also calculated is used in the same way as when the mobile station 10 requests access. Because the communication is already in progress, the modulation status and coding rate are determined based on the reception status (SINR) of the subchannel being communicated at the base station, the number of subchannels used by the mobile station for communication, and the transmission power. It is also possible to calculate the number of allocated subchannels and the required transmission power accordingly.
- SINR reception status
- the modulation scheme and code used according to the propagation loss between the mobile station 10 and the base station 20, the amount of interference at the base station 20, and the maximum transmission power of the mobile station 10 By dynamically selecting (determining) the conversion rate and the number of subchannels to be allocated, coverage can be expanded and communication speed can be improved while meeting the required communication quality.
- frequency division is performed by assigning an arbitrary number of subchannels to each user (mobile station).
- the multiple access communication system base station
- FDMA multiple access
- the method according to the present invention can be applied to a system to which an adaptive modulation method other than OFDMA, a variable frequency bandwidth, and transmission power control are applied.
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008537349A JP4885971B2 (ja) | 2006-09-29 | 2006-09-29 | 基地局装置 |
KR1020107028651A KR101014940B1 (ko) | 2006-09-29 | 2006-09-29 | 무선 기지국 |
PCT/JP2006/319532 WO2008041291A1 (en) | 2006-09-29 | 2006-09-29 | Base station device |
EP06810911.5A EP2068466B1 (en) | 2006-09-29 | 2006-09-29 | Base station device |
KR1020097006813A KR101050880B1 (ko) | 2006-09-29 | 2006-09-29 | 기지국 장치 |
CN2006800559584A CN101513111B (zh) | 2006-09-29 | 2006-09-29 | 基站装置 |
US12/413,277 US8320402B2 (en) | 2006-09-29 | 2009-03-27 | Base station for allocating sub-channels to mobile station |
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PCT/JP2006/319532 WO2008041291A1 (en) | 2006-09-29 | 2006-09-29 | Base station device |
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US12/413,277 Continuation US8320402B2 (en) | 2006-09-29 | 2009-03-27 | Base station for allocating sub-channels to mobile station |
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JP (1) | JP4885971B2 (ja) |
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CN102415137A (zh) * | 2009-04-27 | 2012-04-11 | 株式会社日立制作所 | 无线通信系统、统合基站及终端 |
JP2011250291A (ja) * | 2010-05-28 | 2011-12-08 | Fujitsu Ltd | 光送信機および光受信機 |
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JP7327531B2 (ja) | 2014-07-28 | 2023-08-16 | 日本電気株式会社 | 無線通信システム、基地局及び無線局 |
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Also Published As
Publication number | Publication date |
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CN101513111B (zh) | 2011-07-20 |
EP2068466A1 (en) | 2009-06-10 |
KR20110005744A (ko) | 2011-01-18 |
EP2068466A4 (en) | 2012-07-25 |
US8320402B2 (en) | 2012-11-27 |
CN101513111A (zh) | 2009-08-19 |
JPWO2008041291A1 (ja) | 2010-01-28 |
EP2068466B1 (en) | 2013-08-28 |
KR101014940B1 (ko) | 2011-02-15 |
KR20090051256A (ko) | 2009-05-21 |
KR101050880B1 (ko) | 2011-07-20 |
JP4885971B2 (ja) | 2012-02-29 |
US20090190546A1 (en) | 2009-07-30 |
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