WO2013088710A1 - Station de base, système de communication et procédé de communication - Google Patents

Station de base, système de communication et procédé de communication Download PDF

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Publication number
WO2013088710A1
WO2013088710A1 PCT/JP2012/007938 JP2012007938W WO2013088710A1 WO 2013088710 A1 WO2013088710 A1 WO 2013088710A1 JP 2012007938 W JP2012007938 W JP 2012007938W WO 2013088710 A1 WO2013088710 A1 WO 2013088710A1
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WO
WIPO (PCT)
Prior art keywords
value
cqi value
cqi
acquired
base station
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PCT/JP2012/007938
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English (en)
Japanese (ja)
Inventor
貴文 渋谷
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京セラ株式会社
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Priority to JP2013549119A priority Critical patent/JP5716101B2/ja
Publication of WO2013088710A1 publication Critical patent/WO2013088710A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Definitions

  • the present invention relates to a base station, a communication system, and a communication method that receive CQI (Channel Quality Indication) information from a mobile station and allocate resources to the mobile station based on the received CQI information.
  • CQI Channel Quality Indication
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • CQI CQI to determine shared channel resource allocation and MCS (Modulation and Coding Scheme) in the downlink
  • MCS Modulation and Coding Scheme
  • FIG. 6 is a diagram showing a communication sequence between such a conventional base station (eNB: evolved-UTRAN NodeB) and a mobile station (UE: User Equipment) such as a mobile terminal.
  • eNB evolved-UTRAN NodeB
  • UE User Equipment
  • the mobile station performs initial communication with the base station through a RACH (Random Access Channel) sequence, and thereafter exchanges parameters for enabling the mobile station to communicate with the base station through a UE-Attach sequence (steps).
  • RACH Random Access Channel
  • the mobile station receives a downlink reference signal (RS), estimates the reception quality by measuring the reference signal, determines the CQI value (step S12), and transmits the CQI information to the base station. (Step S13).
  • RS downlink reference signal
  • step S12 estimates the reception quality by measuring the reference signal
  • step S13 determines the CQI value
  • the processes in step S12 and step S13 are periodically performed.
  • the base station receives the CQI information from the mobile station and acquires the CQI value from the CQI information (step S14).
  • the base station performs scheduling processing based on the acquired CQI value, and allocates resource blocks to the downlink shared channel (DL-SCH: Downlink Shared Channel) in units of resource blocks (RB: Resource Block) (step S15).
  • DL-SCH Downlink Shared Channel
  • RB Resource Block
  • MCS Modulation and Coding scheme
  • the mobile station If the mobile station can correctly decode the data, the mobile station transmits an Ack of a hybrid automatic repeat request (HARQ) for downlink data to the base station. If the data cannot be decoded correctly, the mobile station transmits HARQ. Nack is transmitted to the base station (step S17). Steps S16 and S17 are repeatedly performed, and the base station performs scheduling processing every time a CQI value is acquired in step S14, assigns an MCS, and transmits data to the mobile station.
  • HARQ hybrid automatic repeat request
  • the base station acquires the CQI value from the CQI information received from the mobile station, but the mobile station may not be able to correctly determine the CQI value, or the base station may not be able to correctly decode the CQI information.
  • the acquired CQI value may be small even though the wireless environment is good, or the acquired CQI value may be large even if the wireless environment is bad (for example, due to the effect of high-speed movement or multipath). In this specification, it is said that the accuracy of the CQI value is low because the CQI value acquired in this way is not appropriate.
  • the base station Since the base station performs scheduling processing immediately based on the acquired CQI value, if the accuracy of the CQI value is low, it causes a decrease in throughput, and if CQI values with low accuracy are continuously acquired, the user throughput is greatly reduced. There was a problem to do. In particular, when a large CQI value is acquired even though the wireless environment is bad, there is a problem in that unnecessary resources are used, the throughput of other users is reduced, and the cell throughput of the entire base station is affected. It was.
  • An object of the present invention is to provide a base station, a communication system, and a communication method capable of suppressing a reduction in throughput even when the accuracy of an acquired CQI value is low in order to solve the above-described problem.
  • a base station is a base station that performs scheduling based on a CQI value acquired from a mobile station.
  • the acquired CQI value is changed to the estimated value according to a difference between the acquired CQI value and an estimated value obtained from a past CQI value.
  • a CQI value acquisition unit that acquires a CQI value from CQI information received from a mobile station;
  • the CQI value is A CQI value determination unit for changing to an estimated value; If the difference between the CQI value acquired by the CQI value acquisition unit and the estimated value does not exceed the predetermined value, scheduling is performed using the CQI value acquired by the CQI value acquisition unit, and the CQI value is acquired.
  • a scheduling unit that performs scheduling using the CQI value changed by the CQI value determination unit when the difference between the CQI value acquired by the value acquisition unit and the estimated value exceeds the predetermined value; It is characterized by providing.
  • the CQI value determination unit changes the CQI value when receiving a Nack exceeding a predetermined frequency from a mobile station in communication after changing the CQI value to the estimated value.
  • the CQI value is changed again to a value smaller than the current value.
  • the CQI value determination unit estimates the CQI value when the CQI value acquired by the CQI value acquisition unit is greater than a predetermined range than the estimated value. After the change to the value, when the Nack exceeding the predetermined frequency is not received from the mobile station that is communicating, the changed CQI value is changed again to a value larger than the current value.
  • the CQI value determination unit determines that the estimated value is an average value of the predetermined number of CQI values acquired most recently by the CQI value acquisition unit, or a value having the highest frequency. It is characterized by doing.
  • a communication system includes: A mobile station communicating with the base station; A base station that changes the acquired CQI value to the estimated value according to a difference between a CQI value acquired from the mobile station and an estimated value obtained from a past CQI value; It is characterized by providing.
  • a communication method includes A communication method for performing scheduling based on a CQI value acquired from a mobile station at a base station, The acquired CQI value is changed to the estimated value according to a difference between the acquired CQI value and an estimated value obtained from a past CQI value.
  • the present invention it is possible to suppress a decrease in user throughput and cell throughput even when the accuracy of the acquired CQI value is low.
  • FIG. 1 is a block diagram showing a schematic configuration of a base station according to an embodiment of the present invention.
  • the base station 1 includes a control unit 11, a radio unit 12, a modem unit 13, and a storage unit 14.
  • the control unit 11 controls operations of the radio unit 12, the modem unit 13, and the storage unit 14.
  • the control unit 11 includes a CQI value acquisition unit 111, a CQI value determination unit 112, and a scheduling unit 113. .
  • the mobile station that communicates with the base station 1 calculates the SNR (Signal-to-Noise Ratio), SINR (Signal-to-Interference plus Noise power Ratio), etc. from the reference signal for each user received from the base station 1, CQI value is determined based on The CQI value is indicated by a value from 0 to 15 in the 3GPP standard. When the CQI value is 0, channel assignment is not performed in Out of Range. Also, the larger the CQI value, the better the reception quality (wireless quality).
  • the mobile station periodically notifies the CQI value using an uplink control channel (PUCCH: Physical Uplink Control Channel) or an uplink shared channel (PUSCH: Physical Uplink Shared Channel) assigned from the base station 1.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • the CQI value acquisition unit 111 receives CQI information from the mobile station, decodes the CQI information, and acquires a CQI value.
  • the CQI value determination unit 112 calculates an estimated value of the CQI value from the CQI value in the past (for example, the predetermined number of times acquired most recently) by the CQI value acquisition unit 111.
  • the estimated value can be an average value of the CQI values for the predetermined number of times acquired most recently by the CQI value acquisition unit 111 or a value with the highest frequency (most frequent value). Further, the estimated value may be calculated from the tendency of the CQI value for the predetermined number of times acquired most recently by the CQI value acquiring unit 111.
  • the CQI value determination unit 112 compares the CQI value acquired by the CQI value acquisition unit 111 and the estimated value, and when the difference between the two is equal to or less than a predetermined value, the accuracy of the CQI value is high. If the CQI value is not changed and the difference between the two exceeds a predetermined value, it is determined that the accuracy of the CQI value is low and the CQI value is changed to an estimated value. This operation will be described later using a flowchart.
  • the CQI value determination unit 112 determines that the accuracy of the CQI value is low and changes the CQI value to an estimated value, and receives a Nack exceeding a predetermined frequency from the mobile station in communication, the CQI value determination unit 112 Since it is considered that the CQI value is not an optimum value, the CQI value may be changed again. For example, when the CQI value determination unit 112 receives a Nack exceeding a predetermined frequency from the mobile station with which it is communicating after changing the CQI value, the CQI value determining unit 112 changes the CQI value again to a value smaller than the current value.
  • the CQI value determining unit 112 changes the CQI value to the estimated value, and then performs the communication movement.
  • the changed CQI value may be changed again to a value larger than the current value. This operation will be described later using a flowchart.
  • the scheduling unit 113 uses the CQI value acquired by the CQI value acquisition unit 111 when the CQI value determination unit 112 determines that the accuracy is high, and when the CQI value determination unit 112 determines that the accuracy is low. Scheduling is performed using the CQI value changed by the CQI value determination unit 112. For example, the scheduling unit 113 sets 12 consecutive subcarriers as one RB, divides the subcarriers every 1 ms, and performs scheduling by combining the frequency axis and the time axis. Also, the modulation and coding scheme MCS is determined such that more information is transmitted as the CQI value is larger in the allocated RBs. In this specification, it is called scheduling including determination of MCS.
  • the radio unit 12 up-converts the transmission signal to a predetermined radio frequency, and transmits the signal amplified to a predetermined transmission power via the antenna. Further, the radio unit 12 performs power amplification, band limitation, and down-conversion on the signal received via the antenna.
  • the modulation / demodulation unit 13 modulates a carrier wave with a baseband signal by a modulation unit (not shown) to generate a modulated wave. Further, the modem 13 demodulates the modulated wave by a demodulator (not shown) to generate a baseband signal.
  • a modulation unit not shown
  • the modem 13 demodulates the modulated wave by a demodulator (not shown) to generate a baseband signal.
  • an OFDMA (Orthogonal Frequency Division Multiple Access) modulation wave is used as a downlink modulation wave
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the storage unit 14 stores the latest CQI values for a predetermined number of times (for example, 100 times) for each user. In addition, various data necessary for other communication operations are stored.
  • the base station 1 does not perform scheduling based on the CQI value that is always acquired as in the conventional step S15 shown in FIG. 6, but performs determination processing and change processing of the acquired CQI value, and then Perform scheduling.
  • FIG. 2 is a flowchart illustrating an operation example of the CQI value acquisition unit 111, the CQI value determination unit 112, and the scheduling unit 113 of the control unit 11 of the base station 1. As shown in FIG. 2, first, the control unit 11 acquires a CQI value by the CQI value acquisition unit 111 (step S101).
  • control unit 11 uses the CQI value determination unit 112 to obtain the average value or the highest frequency of CQI values for a predetermined number of times (for example, 100 times) acquired most recently by the CQI value acquisition unit 111 and stored in the storage unit 14.
  • a value is calculated as an estimated value, and the calculated estimated value is compared with the CQI value acquired in step S101 to determine whether or not the difference between the two exceeds a predetermined range (for example, ⁇ 2) (step S102). ).
  • step S102 When determining that the difference between the CQI value and the estimated value does not exceed the predetermined range in step S102 (step S102—Yes), the CQI value determining unit 112 determines that the accuracy of the acquired CQI value is high. The CQI value is not changed (step S103). Then, the scheduling unit 113 performs scheduling based on the unchanged CQI value (step S103).
  • step S102 determines in step S102 that the difference between the CQI value and the estimated value is less than or equal to a predetermined range (step S102—No), the accuracy of the acquired CQI value is low. Judgment is made and the CQI value is changed to an estimated value (step S104). Then, the scheduling unit 113 performs scheduling based on the changed CQI value (step S104). When there are a plurality of estimated values (most frequent values), the higher CQI value is selected.
  • the CQI value determination unit 112 determines whether or not the CQI value is lower than the estimated value by exceeding a predetermined range (for example, ⁇ 2) (step S105).
  • a predetermined range for example, ⁇ 2
  • the CQI value is smaller than the estimated value by exceeding a predetermined range (step S105-Yes)
  • the acquired CQI value is small even though the wireless environment is good, not in a high-speed movement or multipath environment Is the case.
  • Nack occurs frequently (occurs more than a predetermined frequency)
  • step S106 If it is determined in step S106 that Nack frequently occurs (step S106-Yes), the CQI value determination unit 112 changes the CQI value again to a value smaller than the current value by a predetermined value (eg, 1) (step S107). ). Then, scheduling is performed by the scheduling unit 113 based on the changed CQI value (step S107). It is assumed that the occurrence of Nack is reduced by making the CQI value smaller than the current value. Steps S106 and S107 may be repeatedly performed until the occurrence frequency of Nack becomes lower than a predetermined frequency.
  • a predetermined value eg, 1
  • step S105-No when the CQI value is larger than the estimated value by exceeding a predetermined range (for example, +2) (step S105-No), it is acquired even though the wireless environment is bad due to, for example, high-speed movement or multipath environment. This is a case where the CQI value is large. In this case, it is determined whether or not Nack frequently occurs (occurs more than a predetermined frequency) as a result of resource allocation based on the CQI value after the change to the estimated value (step S108).
  • a predetermined range for example, +2
  • step S108 When it is determined in step S108 that Nack does not occur frequently (No in step S108), the CQI value determination unit 112 changes the CQI value again to a value larger than the current value by a predetermined value (for example, 1). (Step S109). Then, scheduling is performed by the scheduling unit 113 based on the changed CQI value (step S109). By increasing the CQI value from the current value, the throughput can be increased.
  • step S108 determines that Nack is frequently generated in step S108 (step S108-Yes)
  • the CQI value determination unit 112 changes the CQI value to a value smaller than the current value by a predetermined value (eg, 1) (step S110).
  • a predetermined value eg, 1
  • scheduling is performed by the scheduling unit 113 based on the changed CQI value (step S110). It is assumed that the occurrence of Nack is reduced by lowering the CQI value. Step S108 and step S110 may be repeatedly performed until the occurrence frequency of Nack becomes lower than a predetermined frequency.
  • FIG. 3 is a graph showing a distribution example of CQI values acquired by the base station 1 when the wireless environment is good.
  • the acquired CQI values are distributed widely from 13 to 15, and it can be said that CQI value 6 is a false detection.
  • the operation when the acquired CQI value is 6 and the distribution of the last 100 CQI values is the graph shown in FIG. 3 will be described with reference to the flowchart shown in FIG.
  • the CQI value determination unit 112 calculates the estimated value (most frequent value) of CQI as 15, and the obtained CQI value 6 is within a predetermined range compared to the estimated value 15 of CQI value ( Here, it is determined that it is not ⁇ 2.
  • CQI value determining section 112 changes the CQI value from 6 to an estimated value of 15.
  • step S105 the CQI value determination unit 112 determines that the acquired CQI value 6 is equal to or less than the estimated value 15, and determines in step S106 whether Nack frequently occurs. If the CQI value of 6 is a false detection, even if the CQI value is changed to the estimated value of 15, it is considered that Nack does not occur frequently.
  • FIG. 5 is a graph showing an example of distribution of CQI values acquired by the base station 1 when the wireless environment is bad.
  • the acquired CQI values are widely distributed from 1 to 3, and it can be said that CQI value 13 is a false detection.
  • the operation when the acquired CQI value is 13 and the distribution of the last 100 CQI values is the graph shown in FIG. 5 will be described with reference to the flowchart shown in FIG.
  • the CQI value determination unit 112 calculates an estimated value (most frequent value) of CQI as 2, and the obtained CQI value 13 is within a predetermined range compared to the estimated value 2 of the CQI value ( Here, it is determined that it is not ⁇ 2.
  • CQI value determining section 112 changes the CQI value from 13 to an estimated value of 2.
  • step S105 the CQI value determination unit 112 determines that the acquired CQI value 13 exceeds the estimated value 2, and determines whether or not Nack frequently occurs in step S108. If the CQI value 13 is false detection, it is considered that Nack does not occur frequently even if the CQI value is changed to the estimated value 2. If Nack does not occur frequently, the CQI value determining unit 112 may change the CQI value to a value larger than 2 again in step S109 to improve the throughput.
  • the CQI value is erroneously detected as 13, for example, at a certain timing, the throughput of other users or the whole cell is lowered in a certain section.
  • the CQI value is reduced by performing the above-described processing. Since the value is changed to a value larger than 2, a decrease in throughput can be suppressed.
  • the base station 1 changes the acquired CQI value to the estimated value according to the difference between the CQI value acquired from the mobile station and the estimated value obtained from the past CQI value.
  • the CQI value determination unit 112 compares the CQI value acquired by the CQI value acquisition unit 111 and the estimated value obtained from the CQI value for the predetermined number of times acquired most recently by the CQI value acquisition unit 111, If the difference is less than or equal to a predetermined value, it is determined that the accuracy of the CQI value is high and the CQI value is not changed. If the difference between the two exceeds a predetermined value, it is determined that the accuracy of the CQI value is low. To change the CQI value to an estimated value.
  • the scheduling unit 113 performs scheduling using the CQI value acquired by the CQI value acquiring unit 111, and the CQI value determining unit 112 has low accuracy. If it is determined, scheduling is performed using the CQI value changed by the CQI value determining unit 112. For this reason, according to the base station 1, it becomes possible to suppress a decrease in throughput and cell throughput.

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

Abstract

La présente invention se rapporte à une station de base pour laquelle la réduction du débit peut être supprimée même si la précision d'une valeur d'indicateur de qualité de canal (CQI) est faible. Une station de base (1) qui effectue un ordonnancement sur la base d'une valeur d'indicateur CQI acquise d'une station mobile, passe la valeur d'indicateur CQI acquise à une valeur estimée, qui a été déterminée à partir des précédentes valeurs d'indicateur CQI, selon la différente entre la valeur d'indicateur CQI acquise et la valeur estimée.
PCT/JP2012/007938 2011-12-12 2012-12-12 Station de base, système de communication et procédé de communication WO2013088710A1 (fr)

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JP2011271417 2011-12-12
JP2011-271417 2011-12-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018061168A1 (fr) * 2016-09-29 2018-04-05 富士通株式会社 Dispositif de communication sans fil, système de communication sans fil et procédé de communication sans fil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005122263A1 (fr) * 2004-06-14 2005-12-22 Mitsubishi Denki Kabushiki Kaisha Station de base et procédé de réception
WO2010071514A1 (fr) * 2008-12-18 2010-06-24 Telefonaktiebolaget L M Ericsson (Publ) Unité et procédé de communications à utiliser dans un réseau de communications sans fil
JP2010528525A (ja) * 2007-05-24 2010-08-19 テレフオンアクチーボラゲット エル エム エリクソン（パブル） チャンネル品質を報告する方法及び装置
WO2010134196A1 (fr) * 2009-05-22 2010-11-25 富士通株式会社 Système de communication, procédé de transmission d'informations, procédé de réglage de code, station de base et station mobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005122263A1 (fr) * 2004-06-14 2005-12-22 Mitsubishi Denki Kabushiki Kaisha Station de base et procédé de réception
JP2010528525A (ja) * 2007-05-24 2010-08-19 テレフオンアクチーボラゲット エル エム エリクソン（パブル） チャンネル品質を報告する方法及び装置
WO2010071514A1 (fr) * 2008-12-18 2010-06-24 Telefonaktiebolaget L M Ericsson (Publ) Unité et procédé de communications à utiliser dans un réseau de communications sans fil
WO2010134196A1 (fr) * 2009-05-22 2010-11-25 富士通株式会社 Système de communication, procédé de transmission d'informations, procédé de réglage de code, station de base et station mobile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018061168A1 (fr) * 2016-09-29 2018-04-05 富士通株式会社 Dispositif de communication sans fil, système de communication sans fil et procédé de communication sans fil

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