WO2013054850A1 - Base station and communication control method - Google Patents

Base station and communication control method Download PDF

Info

Publication number
WO2013054850A1
WO2013054850A1 PCT/JP2012/076334 JP2012076334W WO2013054850A1 WO 2013054850 A1 WO2013054850 A1 WO 2013054850A1 JP 2012076334 W JP2012076334 W JP 2012076334W WO 2013054850 A1 WO2013054850 A1 WO 2013054850A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile station
drx
scheduling
base station
scheduling request
Prior art date
Application number
PCT/JP2012/076334
Other languages
French (fr)
Japanese (ja)
Inventor
徹 内野
アニール ウメシュ
義顕 大藤
尚人 大久保
耕平 清嶋
Original Assignee
株式会社エヌ・ティ・ティ・ドコモ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社エヌ・ティ・ティ・ドコモ filed Critical 株式会社エヌ・ティ・ティ・ドコモ
Publication of WO2013054850A1 publication Critical patent/WO2013054850A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a base station and a communication control method for transmitting a UL grant granting transmission of user data in an uplink direction to the mobile station in response to a scheduling request in the uplink direction of the mobile station received from a mobile station.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • DRX command MAC CE A DRX command MAC Control Element (hereinafter referred to as DRX command MAC CE) transmitted by the base station is defined.
  • DRX command MAC CE is used to force the mobile station to transition to the DRX state when it is difficult for the mobile station to transition to the DRX state due to reception of a control channel (DCCH) during handover or reconnection of the mobile station. It can be suitably used.
  • DCCH control channel
  • a mobile station that has transitioned to the DRX state holds uplink dedicated resources (for example, uplink control channel (PUCCH)) when user data in the uplink direction is generated, the mobile station in the uplink direction
  • a Scheduling Request for requesting scheduling is transmitted to the base station and transitions to the Active state (non-DRX state).
  • the base station that has received the Scheduling Request instructs the Random Access (RA) procedure by transmitting a SyncRequest to the mobile station when uplink (UL) synchronization needs to be established.
  • RA Random Access
  • UL uplink
  • the conventional mobile station control method described above has the following problems. That is, if the base station erroneously receives a Scheduling Request from a mobile station that is in the DRX state, the base station receives an erroneously received Scheduling Request and the mobile station corresponding to the Active Request, that is, receives a downlink control channel from the base station. Assuming that the mobile station is in a ready state, the mobile station transmits a UL grant permitting uplink user data transmission. For this reason, the mobile station that has received UL grant may unnecessarily return from the DRX state to the non-DRX state. For this reason, there has been a problem that battery consumption of the mobile station cannot be effectively suppressed. Further, when a state mismatch regarding the DRX state occurs between the mobile station and the base station, the base station performs scheduling for the mobile station in the DRX state. There was also a problem that direction resources were wasted.
  • An object of the present invention is to provide a base station and a communication control method that can prevent battery consumption of the mobile station due to return to the DRX state and unnecessary scheduling for the mobile station in the DRX state.
  • the first feature of the present invention is that UL rant grant that permits transmission of user data in the uplink direction is transmitted to the mobile station in response to the scheduling Request in the uplink direction of the mobile station received from the mobile station (mobile station 200).
  • a base station eg, base station 100A
  • a scheduling processing unit scheduling processing unit 105) that schedules a station to a predetermined radio resource block, and when the mobile station is determined to be in a DRX state by the DRX control unit,
  • the gist is to stop the transmission of UL grant even when receiving a Scheduling Request determined to have been transmitted from the mobile station.
  • a communication control method for transmitting, to a mobile station, a UL grant granting transmission of user data in the uplink direction in response to a scheduling request in the uplink direction of the mobile station received from the mobile station.
  • the communication device controls the mobile station to a DRX state where the control channel is intermittently received, and the communication device schedules the mobile station to a predetermined radio resource block based on the Scheduling Request.
  • the scheduling step if it is determined that the mobile station is in the DRX state, transmission of UL grant is stopped even if a Scheduling Request determined to be transmitted from the mobile station is received. This is the gist.
  • FIG. 1 is an overall schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
  • FIG. 2 is a functional block configuration diagram of the base station 100A according to the embodiment of the present invention.
  • FIG. 3 is a diagram showing a communication sequence at the time of handover between the base station 100A and the mobile station 200 according to the embodiment of the present invention.
  • FIG. 4 is a diagram showing a DRX ⁇ ⁇ ⁇ command MAC CE transmission operation flow in the base station 100A accompanying the handover decision of the mobile station 200 according to the embodiment of the present invention.
  • FIG. 5 is a diagram showing a communication sequence between the base station 100A and the mobile station 200 according to the modified example of the present invention.
  • FIG. 1 is an overall schematic configuration diagram of a radio communication system according to the present embodiment.
  • the radio communication system according to the present embodiment employs a Long Term Evolution (LTE) scheme, and includes a core network 50, base stations 100A, 100B (eNB), and a mobile station 200 (UE). Including.
  • LTE Long Term Evolution
  • the base station 100A is connected to the core network 50.
  • Base station 100A (100B) forms cell C1 (cell C2) and performs radio communication with mobile station 200 according to the LTE scheme.
  • the base station 100A (or base station 100B, hereinafter the same) moves the UL grant granting the transmission of user data in the uplink direction in response to the scheduling request in the uplink direction received from the mobile station 200. Transmit to station 200.
  • FIG. 2 is a functional block configuration diagram of the base station 100A.
  • the base station 100A includes a radio communication unit 101, a data transmission / reception unit 103, a scheduling processing unit 105, a timer control unit 107, and a DRX control unit 109.
  • the base station 100A realizes these functional blocks by a platform unit (PF) and an application unit (AP).
  • PF platform unit
  • AP application unit
  • the wireless communication unit 101 performs wireless communication with the mobile station 200 according to the LTE method.
  • the data transmission / reception unit 103 transmits / receives control data (C-plane data) and user data (U-Plane data) for the mobile station 200 via the wireless communication unit 101.
  • control data C-plane data
  • user data U-Plane data
  • the data transmitting / receiving unit 103 receives a Scheduling Request that is a type of control data transmitted from the mobile station 200.
  • the scheduling processing unit 105 executes processing related to Scheduling Request that requests scheduling to the radio resource block (physical control channel or physical shared channel) of the mobile station 200 in the uplink direction transmitted from the mobile station 200.
  • the scheduling processing unit 105 schedules the mobile station 200 to a predetermined radio resource block based on the received Scheduling Request. In addition, when it is determined that UL synchronization needs to be established, the scheduling processing unit 105 instructs the mobile station 200 to start a RandomandAccess (RA) procedure via the downlink control physical channel (PDCCH).
  • RA RandomandAccess
  • the scheduling processing unit 105 may receive a Scheduling Request determined to be transmitted from the mobile station 200. Stop sending UL grant. That is, when it is determined that the mobile station 200 is in the DRX state, the scheduling processing unit 105 erroneously receives the Scheduling Request, for example, erroneously determines that the Scheduling Request is transmitted from the mobile station 200 due to noise, interference waves, or the like. In this case, the scheduling request is ignored and the UL grant is not transmitted to the mobile station 200.
  • the scheduling processing unit 105 may transmit a UL grant to the mobile station 200 when it repeatedly receives a scheduling request from the mobile station 200 a predetermined number of times (for example, three times).
  • the scheduling processing unit 105 receives a scheduling request that is determined to be transmitted from the mobile station 200. Can be stopped. For example, if the DRX control unit 109 decides to transmit DRX command MAC CE after the start of the handover or reconnection procedure of the mobile station 200, the scheduling processing unit 105 can stop sending UL grant. . Even in this case, when the scheduling processing unit 105 repeatedly receives a predetermined number of Scheduling Requests from the mobile station 200 after the start of the handover or reconnection procedure of the mobile station 200, the scheduling processing unit 105 transmits a UL grant to the mobile station 200. Is preferred.
  • the timer control unit 107 controls various timers used in the base station 100A. Specifically, the timer control unit 107 controls UE Inactive Timer.
  • the DRX control unit 109 controls the mobile station 200 to either a DRX (Discontinuous Reception) state or a non-DRX state.
  • the mobile station 200 in the DRX state receives the control channel, specifically, the PDCCH intermittently only for a specific period.
  • the mobile station 200 in the non-DRX state continuously receives the PDCCH.
  • the DRX control unit 109 controls the mobile station 200 to the DRX state by transmitting DRX command MAC MAC to the mobile station 200.
  • the PDCCH is not transmitted from the base station 100A, so the DRX Inactivity Timer of the mobile station 200 reaches the threshold value, and the mobile station 200 is in the DRX state. Transition to.
  • FIG. 3 shows a communication sequence at the time of handover between the base station 100A and the mobile station 200.
  • description will be made assuming that mobile station 200 has been handed over to base station 100A.
  • the base station 100A executes a handover RBSID setting process (macro) that is executed when the mobile station 200 is handed over (S10).
  • a handover RBSID setting process macro
  • the state of UE Inactive Timer is taken over between PF and AP.
  • the base station 100A starts UE Inactive Timer and starts measurement using UE Inactive Timer (S20).
  • the mobile station 200 executes a Random Access (RA) procedure with the base station 100A, and establishes a connection with the base station 100A (S30 to S40).
  • RA Random Access
  • the base station 100A detects that the measurement time of the UE Inactive Timer has exceeded Th drxcommand (S50), and transmits a DRX command MAC CE to the mobile station 200.
  • the mobile station 200 that has received the DRX command MAC CE transits to the DRX state (S60).
  • the base station 100A does not transmit a UL grant until receiving a Scheduling request N times (for example, 3 times) from the mobile station 200 (S70).
  • FIG. 4 shows a transmission operation flow of the DRX command MAC CE in the base station 100A when the handover of the mobile station 200 is determined.
  • the base station 100A executes a procedure (RA procedure or the like) necessary for handover with the mobile station 200 (S110).
  • RA procedure a procedure necessary for handover with the mobile station 200
  • S110 the mobile station 200
  • UE Inactive Timer is activated.
  • the base station 100A transmits a DRX command MAC CE to the mobile station 200 when the measurement time of the UE Inactive Timer exceeds Th drxcommand (S120).
  • the base station 100A receives a Scheduling Request from the mobile station 200 (S130).
  • the base station 100A determines whether or not the Scheduling Request has been received N times from the mobile station 200 (S140).
  • the base station 100A transmits a UL grant to the mobile station 200 (S150).
  • the mobile station 200 has been described as an example of handover.
  • the operation of canceling the UL grant transmission is It is not limited at the time of handover, and after sending DRX command MAC MAC to mobile station 200 and receiving Scheduling Request determined to have been sent from mobile station 200, even if UL grant is stopped Good.
  • the base station 100A when the base station 100A receives the Scheduling request N times, the UL request is transmitted to the mobile station 200.
  • the Scheduling request may be ignored regardless of the number of times the Scheduling request is received.
  • the base station 100A when the DRX control unit 109 determines that the mobile station 200 is in the DRX state, the UL grant transmission is stopped even when the Scheduling Request is received from the mobile station 200. The For this reason, according to the base station 100A, it is avoided that the mobile station that has transitioned to the DRX state due to the transmission of the DRX command MAC CE returns to the non-DRX state due to erroneous reception of the Scheduling Request in the base station 100A. Therefore, battery consumption of the mobile station 200 can be prevented.
  • a UL grant can be transmitted to the mobile station 200. For this reason, when the Scheduling Request is correctly received from the mobile station 200, the mobile station 200 can be scheduled to a radio resource.
  • the mobile station 200 when the mobile station 200 frequently repeats handovers or reconnections, it becomes possible to transmit DRX command MAC CE at an appropriate timing to the mobile station 200, and then unnecessary PDCCH transmissions are also possible. As a result, battery consumption of the mobile station 200 can be prevented. That is, even when there is no user data to be transmitted / received, when the handover or reconnection procedure is activated, the base station 100A transmits the PDCCH to the mobile station 200 to transmit control data. The station 200 transitions to the non-DRX state due to reception of the PDCCH.
  • FIG. 5 is a diagram showing a communication sequence between the base station 100A and the mobile station 200 according to the modified example of the present invention.
  • the mobile station 200 every time the mobile station 200 (UE) receives a PDCCH from the base station 100A (eNB), it activates (re) DRX) Inactivity Timer (S210). Similarly, base station 100A (eNB) also (re) starts DRX Inactivity Timer for mobile station 200.
  • the mobile station 200 If the mobile station 200 does not receive the PDCCH for a predetermined time or more, the mobile station 200 transitions to the DRX state when the DRX Inactivity Timer expires (S220). Similarly, the base station 100A also determines that the mobile station 200 has transitioned to the DRX state when the DRX Inactivity Timer for the mobile station 200 expires.
  • the base station 100A erroneously determines that it has received a Scheduling Request from another mobile station (S230). Even in this case, the base station 100A ignores the Scheduling Request and does not transmit a UL grant to the mobile station 200.
  • the base station 100A Do not send UL grant. For this reason, it is possible to prevent the mobile station from draining the battery due to the mobile station returning from the unnecessary DRX state to the non-DRX state.
  • the UL request when the scheduling request is repeatedly received from the mobile station 200, the UL request is transmitted to the mobile station 200.
  • such an operation is not necessarily performed. I do not care.
  • the UL request may be transmitted to the mobile station 200 when the Scheduling request is received again by a predetermined time.
  • the base station 100A executes processing related to transmission of DRX command MAC CE, but all or part of such processing is executed in another communication device (for example, MME). You may do it.
  • the battery of the mobile station when the mobile station is determined to be in the DRX state, the battery of the mobile station by returning from the unnecessary DRX state to the non-DRX state due to erroneous reception of Scheduling Request It is possible to provide a base station and a communication control method that can prevent exhaustion and unnecessary scheduling for a mobile station in a DRX state.
  • Core network 100A, 100B Base station 101 .
  • Wireless communication unit 103 Data transmission / reception unit 105 . Scheduling unit 107 .
  • Timer control unit 109 ...
  • DRX control unit 200 ... Mobile station C1, C2 ... Cell

Abstract

Provided are a base station and a communication control method with which it is possible, when a mobile terminal is determined to be in a DRX state, to prevent unnecessary scheduling of the mobile terminal in a DRX state and depletion of the battery of the mobile terminal caused by the unnecessary return of the mobile terminal from a DRX state to a non-DRX state due to the erroneous receipt of a Scheduling Request. A base station (100A) is provided with a DRX control unit (109) for controlling so as to cause a mobile terminal to be in a DRX state for intermittently receiving a control channel, and a scheduling processing unit (105) for scheduling a mobile terminal into a prescribed wireless resource block on the basis of a Scheduling Request. When the DRX control unit (109) determines that the mobile terminal is in a DRX state, the scheduling processing unit (105) cancels transmission of a UL grant even upon receiving a Scheduling Request determined to have been transmitted from said mobile terminal.

Description

基地局及び通信制御方法Base station and communication control method
　本発明は、移動局から受信した当該移動局の上り方向におけるScheduling Requestに応じて、上り方向におけるユーザデータの送信を許可するUL grantを当該移動局に送信する基地局及び通信制御方法に関する。 The present invention relates to a base station and a communication control method for transmitting a UL grant granting transmission of user data in an uplink direction to the mobile station in response to a scheduling request in the uplink direction of the mobile station received from a mobile station.
　3rd Generation Partnership Project（3GPP）において標準化されているLong Term Evolution（LTE）では、移動局（UE）のバッテリ消耗を抑制する観点から、移動局が送受信するデータが一定期間以上存在しない場合、基地局（eNB）から送信される下り制御チャネル（PDCCH）を特定の期間のみ、間欠的に受信するDRX（Discontinuous Reception）制御が採用されている（例えば、非特許文献１参照）。 In Long Term Evolution (LTE), which is standardized in 3rd Generation Partnership Project (3GPP), if the data transmitted / received by the mobile station does not exist for a certain period or longer, the base station DRX (Discontinuous Reception) control that intermittently receives a downlink control channel (PDCCH) transmitted from (eNB) only for a specific period is employed (for example, see Non-Patent Document 1).
　移動局がDRX状態に遷移する契機のひとつとして、移動局毎に当該移動局に送信すべきユーザデータが存在しない時間を計測するUE Inactive Timerの値が閾値（Thdrxcommand）を超えた場合に、基地局が送信するDRX command MAC Control Element（以下、DRX command MAC CE）が規定されている。移動局は、DRX command MAC CEを受信すると、DRX状態に遷移する。 As one of the triggers for the mobile station to transition to the DRX state, when the value of the UE Inactive Timer that measures the time when there is no user data to be transmitted to the mobile station for each mobile station exceeds a threshold (Th drxcommand ), A DRX command MAC Control Element (hereinafter referred to as DRX command MAC CE) transmitted by the base station is defined. When receiving the DRX command MAC CE, the mobile station transits to the DRX state.
　DRX command MAC CEは、移動局のハンドオーバーまたは再接続時における制御チャネル（DCCH）の受信によって移動局がDRX状態に遷移し難い場合に、当該移動局を強制的にDRX状態に遷移させるために好適に用い得る。 DRX command MAC CE is used to force the mobile station to transition to the DRX state when it is difficult for the mobile station to transition to the DRX state due to reception of a control channel (DCCH) during handover or reconnection of the mobile station. It can be suitably used.
　また、DRX状態に遷移した移動局は、上り方向におけるユーザデータが発生した際に、上り方向の個別リソース（例えば、上り制御チャネル（PUCCH））を保持している場合、上り方向における当該移動局のスケジューリングを要求するScheduling Requestを基地局に送信してActive状態（non-DRX状態）に遷移する。当該Scheduling Requestを受信した基地局は、当該移動局に対して、上りリンク（UL）同期の確立が必要な場合には、SyncRequestを送信することによってRandom Access（RA）手順を指示し、当該RA手順が完了すると、上り方向及び下り方向のスケジューリングを開始する。 In addition, when a mobile station that has transitioned to the DRX state holds uplink dedicated resources (for example, uplink control channel (PUCCH)) when user data in the uplink direction is generated, the mobile station in the uplink direction A Scheduling Request for requesting scheduling is transmitted to the base station and transitions to the Active state (non-DRX state). The base station that has received the Scheduling Request instructs the Random Access (RA) procedure by transmitting a SyncRequest to the mobile station when uplink (UL) synchronization needs to be established. When the procedure is completed, uplink and downlink scheduling is started.
　しかしながら、上述した従来の移動局の制御方法には、次のような問題があった。すなわち、基地局が、DRX状態にある移動局からのScheduling Requestを誤受信すると、基地局は、誤受信したScheduling Requestと対応する移動局がActive状態、つまり、基地局からの下り制御チャネルを受信できる状態にあると見なし、当該移動局に対して、上り方向のユーザデータ送信を許可するUL grantを送信してしまう。このため、UL grantを受信した移動局は、不必要にDRX状態からnon-DRX状態に復帰してしまう場合が生じ得る。このため、移動局のバッテリ消耗を効果的に抑制できない問題があった。さらに、移動局～基地局間においてDRX状態に関する状態不一致が発生すると、基地局は、DRX状態にある移動局に対してスケジューリングを行うため、on duration以外に当該移動局に割り当てられる下り方向及び上り方向のリソースが無駄になるという問題もあった。 However, the conventional mobile station control method described above has the following problems. That is, if the base station erroneously receives a Scheduling Request from a mobile station that is in the DRX state, the base station receives an erroneously received Scheduling Request and the mobile station corresponding to the Active Request, that is, receives a downlink control channel from the base station. Assuming that the mobile station is in a ready state, the mobile station transmits a UL grant permitting uplink user data transmission. For this reason, the mobile station that has received UL grant may unnecessarily return from the DRX state to the non-DRX state. For this reason, there has been a problem that battery consumption of the mobile station cannot be effectively suppressed. Further, when a state mismatch regarding the DRX state occurs between the mobile station and the base station, the base station performs scheduling for the mobile station in the DRX state. There was also a problem that direction resources were wasted.
　そこで、本発明は、このような状況に鑑みてなされたものであり、移動局がDRX状態であると判定されている場合において、Scheduling Requestの誤受信による移動局の不必要なDRX状態からnon-DRX状態への復帰による移動局のバッテリ消耗、及びDRX状態の移動局に対する不要なスケジューリングを防止し得る基地局及び通信制御方法の提供を目的とする。 Therefore, the present invention has been made in view of such a situation, and in the case where the mobile station is determined to be in the DRX state, non-required DRX state of the mobile station due to erroneous reception of Scheduling Request An object of the present invention is to provide a base station and a communication control method that can prevent battery consumption of the mobile station due to return to the DRX state and unnecessary scheduling for the mobile station in the DRX state.
　本発明の第１の特徴は、移動局（移動局200）から受信した前記移動局の上り方向におけるScheduling Requestに応じて、上り方向におけるユーザデータの送信を許可するUL grantを前記移動局に送信する基地局（例えば、基地局100A）であって、制御チャネルを間欠的に受信するDRX状態に前記移動局を制御するDRX制御部（DRX制御部109）と、前記Scheduling Requestに基づいて前記移動局を所定の無線リソースブロックにスケジューリングするスケジューリング処理部（スケジューリング処理部105）とを備え、前記スケジューリング処理部は、前記DRX制御部によって前記移動局がDRX状態であると判定されている場合、前記移動局から送信されたと判定されたScheduling Requestを受信してもUL grantの送信を中止することを要旨とする。 The first feature of the present invention is that UL rant grant that permits transmission of user data in the uplink direction is transmitted to the mobile station in response to the scheduling Request in the uplink direction of the mobile station received from the mobile station (mobile station 200). A base station (eg, base station 100A) that controls the mobile station to a DRX state that intermittently receives a control channel, and the mobile based on the Scheduling Request A scheduling processing unit (scheduling processing unit 105) that schedules a station to a predetermined radio resource block, and when the mobile station is determined to be in a DRX state by the DRX control unit, The gist is to stop the transmission of UL grant even when receiving a Scheduling Request determined to have been transmitted from the mobile station.
　本発明の第２の特徴は、移動局から受信した前記移動局の上り方向におけるScheduling Requestに応じて、上り方向におけるユーザデータの送信を許可するUL grantを前記移動局に送信する通信制御方法であって、通信装置が、制御チャネルを間欠的に受信するDRX状態に前記移動局を制御するステップと、前記通信装置が、前記Scheduling Requestに基づいて前記移動局を所定の無線リソースブロックにスケジューリングするステップとを備え、前記スケジューリングするステップでは、前記移動局がDRX状態であると判定されている場合、前記移動局から送信されたと判定されたScheduling Requestを受信してもUL grantの送信を中止することを要旨とする。 According to a second aspect of the present invention, there is provided a communication control method for transmitting, to a mobile station, a UL grant granting transmission of user data in the uplink direction in response to a scheduling request in the uplink direction of the mobile station received from the mobile station. The communication device controls the mobile station to a DRX state where the control channel is intermittently received, and the communication device schedules the mobile station to a predetermined radio resource block based on the Scheduling Request. In the scheduling step, if it is determined that the mobile station is in the DRX state, transmission of UL grant is stopped even if a Scheduling Request determined to be transmitted from the mobile station is received. This is the gist.
図１は、本発明の実施形態に係る無線通信システムの全体概略構成図である。FIG. 1 is an overall schematic configuration diagram of a radio communication system according to an embodiment of the present invention. 図２は、本発明の実施形態に係る基地局100Aの機能ブロック構成図である。FIG. 2 is a functional block configuration diagram of the base station 100A according to the embodiment of the present invention. 図３は、本発明の実施形態に係る基地局100Aと移動局200との間におけるハンドオーバー時における通信シーケンスを示す図である。FIG. 3 is a diagram showing a communication sequence at the time of handover between the base station 100A and the mobile station 200 according to the embodiment of the present invention. 図４は、本発明の実施形態に係る移動局200のハンドオーバーの決定に伴う基地局100AにおけるDRX command MAC CEの送信動作フローを示す図である。FIG. 4 is a diagram showing a DRX フ ロ ー command MAC CE transmission operation flow in the base station 100A accompanying the handover decision of the mobile station 200 according to the embodiment of the present invention. 図５は、本発明の変更例に係る基地局100Aと移動局200との間における通信シーケンスを示す図である。FIG. 5 is a diagram showing a communication sequence between the base station 100A and the mobile station 200 according to the modified example of the present invention.
　次に、本発明の実施形態について説明する。なお、以下の図面の記載において、同一または類似の部分には、同一または類似の符号を付している。ただし、図面は模式的なものであり、各寸法の比率などは現実のものとは異なることに留意すべきである。 Next, an embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.
　したがって、具体的な寸法などは以下の説明を参酌して判断すべきものである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれていることは勿論である。 Therefore, specific dimensions should be determined in consideration of the following explanation. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
　（１）無線通信システムの全体概略構成
　図１は、本実施形態に係る無線通信システムの全体概略構成図である。図１に示すように、本実施形態に係る無線通信システムは、Long Term Evolution（LTE）方式を採用しており、コアネットワーク50、基地局100A, 100B（eNB）及び移動局200（UE）を含む。 (1) Overall Schematic Configuration of Radio Communication System FIG. 1 is an overall schematic configuration diagram of a radio communication system according to the present embodiment. As shown in FIG. 1, the radio communication system according to the present embodiment employs a Long Term Evolution (LTE) scheme, and includes a core network 50, base stations 100A, 100B (eNB), and a mobile station 200 (UE). Including.
　基地局100Aは、コアネットワーク50に接続されている。基地局100A（100B）は、セルC1（セルC2）を形成し、移動局200とLTE方式に従った無線通信を実行する。特に、本実施形態では、基地局100A（または基地局100B、以下同）は、移動局200から受信した上り方向におけるScheduling Requestに応じて、上り方向におけるユーザデータの送信を許可するUL grantを移動局200に送信する。 The base station 100A is connected to the core network 50. Base station 100A (100B) forms cell C1 (cell C2) and performs radio communication with mobile station 200 according to the LTE scheme. In particular, in this embodiment, the base station 100A (or base station 100B, hereinafter the same) moves the UL grant granting the transmission of user data in the uplink direction in response to the scheduling request in the uplink direction received from the mobile station 200. Transmit to station 200.
　（２）無線通信システムの機能ブロック構成
　次に、本実施形態に係る無線通信システムの機能ブロック構成について説明する。具体的には、基地局100Aの機能ブロック構成について説明する。図２は、基地局100Aの機能ブロック構成図である。 (2) Functional Block Configuration of Radio Communication System Next, a functional block configuration of the radio communication system according to the present embodiment will be described. Specifically, the functional block configuration of base station 100A will be described. FIG. 2 is a functional block configuration diagram of the base station 100A.
　図２に示すように、基地局100Aは、無線通信部101、データ送受信部103、スケジューリング処理部105、タイマ制御部107及びDRX制御部109を備える。なお、基地局100Aは、これらの機能ブロックを、プラットフォーム部（PF）及びアプリケーション部（AP）によって実現する。 As shown in FIG. 2, the base station 100A includes a radio communication unit 101, a data transmission / reception unit 103, a scheduling processing unit 105, a timer control unit 107, and a DRX control unit 109. The base station 100A realizes these functional blocks by a platform unit (PF) and an application unit (AP).
　無線通信部101は、移動局200とLTE方式に従った無線通信を実行する。 The wireless communication unit 101 performs wireless communication with the mobile station 200 according to the LTE method.
　データ送受信部103は、無線通信部101を介して移動局200向けの制御データ（C-planeデータ）及びユーザデータ（U-Planeデータ）を送受信する。特に、本実施形態では、データ送受信部103は、移動局200から送信された制御データの一種であるScheduling Requestを受信する。 The data transmission / reception unit 103 transmits / receives control data (C-plane data) and user data (U-Plane data) for the mobile station 200 via the wireless communication unit 101. In particular, in the present embodiment, the data transmitting / receiving unit 103 receives a Scheduling Request that is a type of control data transmitted from the mobile station 200.
　スケジューリング処理部105は、移動局200から送信された上り方向における移動局200の無線リソースブロック（物理制御チャネルや物理共有チャネル）へのスケジューリングを要求するScheduling Requestに関する処理を実行する。 The scheduling processing unit 105 executes processing related to Scheduling Request that requests scheduling to the radio resource block (physical control channel or physical shared channel) of the mobile station 200 in the uplink direction transmitted from the mobile station 200.
　具体的には、スケジューリング処理部105は、受信したScheduling Requestに基づいて移動局200を所定の無線リソースブロックにスケジューリングする。また、スケジューリング処理部105は、UL同期の確立が必要と判断した場合に、下り制御物理チャネル（PDCCH）を介して移動局200にRandom Access（RA）手順の起動を指示する。 Specifically, the scheduling processing unit 105 schedules the mobile station 200 to a predetermined radio resource block based on the received Scheduling Request. In addition, when it is determined that UL synchronization needs to be established, the scheduling processing unit 105 instructs the mobile station 200 to start a RandomandAccess (RA) procedure via the downlink control physical channel (PDCCH).
　特に、本実施形態では、スケジューリング処理部105は、DRX制御部109によって移動局200がDRX状態であると判定されている場合、移動局200から送信されたと判定されたScheduling Requestを受信してもUL grantの送信を中止する。つまり、スケジューリング処理部105は、移動局200がDRX状態であると判定されている場合、Scheduling Requestを誤受信、例えば、雑音や干渉波などによりScheduling Requestが移動局200から送信されたと誤って判定した場合、当該Scheduling Requestを無視し、移動局200に対してUL grantを送信しない。 In particular, in the present embodiment, when the mobile station 200 is determined to be in the DRX state by the DRX control unit 109, the scheduling processing unit 105 may receive a Scheduling Request determined to be transmitted from the mobile station 200. Stop sending UL grant. That is, when it is determined that the mobile station 200 is in the DRX state, the scheduling processing unit 105 erroneously receives the Scheduling Request, for example, erroneously determines that the Scheduling Request is transmitted from the mobile station 200 due to noise, interference waves, or the like. In this case, the scheduling request is ignored and the UL grant is not transmitted to the mobile station 200.
　なお、スケジューリング処理部105は、移動局200から所定回数（例えば、３回）のScheduling Requestを繰り返し受信した場合、UL grantを移動局200に送信してもよい。 Note that the scheduling processing unit 105 may transmit a UL grant to the mobile station 200 when it repeatedly receives a scheduling request from the mobile station 200 a predetermined number of times (for example, three times).
　また、スケジューリング処理部105は、DRX制御部109が移動局200をDRX状態に制御するDRX command MAC CEを送信する場合、移動局200から送信されたと判定されたScheduling Requestを受信した場合でもUL grantの送信を中止することができる。例えば、スケジューリング処理部105は、移動局200のハンドオーバーまたは再接続手順の開始後に、DRX制御部109がDRX command MAC CEを送信することを決定した場合、UL grantの送信を中止することができる。この場合においても、スケジューリング処理部105は、移動局200のハンドオーバーまたは再接続手順の開始後に、移動局200から所定回数のScheduling Requestを繰り返し受信した場合、UL grantを移動局200に送信することが好ましい。 In addition, when the DRX control unit 109 transmits a DRX command MAC that controls the mobile station 200 to the DRX state, the scheduling processing unit 105 receives a scheduling request that is determined to be transmitted from the mobile station 200. Can be stopped. For example, if the DRX control unit 109 decides to transmit DRX command MAC CE after the start of the handover or reconnection procedure of the mobile station 200, the scheduling processing unit 105 can stop sending UL grant. . Even in this case, when the scheduling processing unit 105 repeatedly receives a predetermined number of Scheduling Requests from the mobile station 200 after the start of the handover or reconnection procedure of the mobile station 200, the scheduling processing unit 105 transmits a UL grant to the mobile station 200. Is preferred.
　タイマ制御部107は、基地局100Aにおいて用いられる各種タイマを制御する。具体的には、タイマ制御部107は、UE Inactive Timerを制御する。 The timer control unit 107 controls various timers used in the base station 100A. Specifically, the timer control unit 107 controls UE Inactive Timer.
　DRX制御部109は、移動局200をDRX（Discontinuous Reception）状態、またはnon-DRX状態の何れかに制御する。DRX状態の移動局200は、制御チャネル、具体的には、PDCCHを特定の期間のみ、間欠的に受信する。一方、non-DRX状態の移動局200は、PDCCHを継続して受信する。 The DRX control unit 109 controls the mobile station 200 to either a DRX (Discontinuous Reception) state or a non-DRX state. The mobile station 200 in the DRX state receives the control channel, specifically, the PDCCH intermittently only for a specific period. On the other hand, the mobile station 200 in the non-DRX state continuously receives the PDCCH.
　具体的には、DRX制御部109は、DRX command MAC CEを移動局200に送信することによって、移動局200をDRX状態に制御する。なお、通常のケースでは、移動局200が送信すべきユーザデータがなくなると、基地局100AからPDCCHが送信されなくなるため、移動局200のDRX Inactivity Timerが閾値に到達し、移動局200はDRX状態に遷移する。 Specifically, the DRX control unit 109 controls the mobile station 200 to the DRX state by transmitting DRX command MAC MAC to the mobile station 200. In a normal case, when there is no user data to be transmitted by the mobile station 200, the PDCCH is not transmitted from the base station 100A, so the DRX Inactivity Timer of the mobile station 200 reaches the threshold value, and the mobile station 200 is in the DRX state. Transition to.
　（３）無線通信システムの動作
　次に、本実施形態に係る無線通信システムの動作について説明する。具体的には、基地局100A（eNB）による移動局200（UE）のDRX状態への制御動作について説明する。 (3) Operation of Radio Communication System Next, the operation of the radio communication system according to the present embodiment will be described. Specifically, the control operation to the DRX state of the mobile station 200 (UE) by the base station 100A (eNB) will be described.
　（３．１）通信シーケンス
　図３は、基地局100Aと移動局200との間におけるハンドオーバー時における通信シーケンスを示す。ここでは、移動局200が基地局100Aにハンドオーバーしてきたものとして説明する。 (3.1) Communication Sequence FIG. 3 shows a communication sequence at the time of handover between the base station 100A and the mobile station 200. Here, description will be made assuming that mobile station 200 has been handed over to base station 100A.
　図３に示すように、基地局100Aは、移動局200のハンドオーバーに伴って実行されるハンドオーバーRBSID設定処理（マクロ）を実行する（S10）。なお、ここで、UE Inactive Timerの状態がPFとAPとの間で引き継がれる。 As shown in FIG. 3, the base station 100A executes a handover RBSID setting process (macro) that is executed when the mobile station 200 is handed over (S10). Here, the state of UE Inactive Timer is taken over between PF and AP.
　移動局200のハンドオーバーが開始されると、基地局100Aは、UE Inactive Timerの起動し、UE Inactive Timerによる計測を開始する（S20）。 When the handover of the mobile station 200 is started, the base station 100A starts UE Inactive Timer and starts measurement using UE Inactive Timer (S20).
　移動局200は、基地局100AとRandom Access（RA）手順を実行し、基地局100Aとの接続を確立する（S30～S40）。 The mobile station 200 executes a Random Access (RA) procedure with the base station 100A, and establishes a connection with the base station 100A (S30 to S40).
　次いで、基地局100Aは、UE Inactive Timerの計測時間がThdrxcommandを超えたことを検出（S50）し、DRX command MAC CEを移動局200に送信する。DRX command MAC CEを受信した移動局200は、DRX状態に遷移する（S60）。 Next, the base station 100A detects that the measurement time of the UE Inactive Timer has exceeded Th drxcommand (S50), and transmits a DRX command MAC CE to the mobile station 200. The mobile station 200 that has received the DRX command MAC CE transits to the DRX state (S60).
　その後、基地局100Aは、移動局200からScheduling RequestをN回（例えば、３回）受信するまで、UL grantを送信しない（S70）。 After that, the base station 100A does not transmit a UL grant until receiving a Scheduling request N times (for example, 3 times) from the mobile station 200 (S70).
　（３．２）基地局100Aの動作フロー
　図４は、移動局200のハンドオーバーの決定に伴う基地局100AにおけるDRX command MAC CEの送信動作フローを示す。 (3.2) Operation Flow of Base Station 100A FIG. 4 shows a transmission operation flow of the DRX command MAC CE in the base station 100A when the handover of the mobile station 200 is determined.
　図４に示すように、基地局100Aは、移動局200とハンドオーバーに必要な手順（RA手順など）を実行する（S110）。なお、上述したように、移動局200のハンドオーバーが開始されると、UE Inactive Timerが起動される。 As shown in FIG. 4, the base station 100A executes a procedure (RA procedure or the like) necessary for handover with the mobile station 200 (S110). As described above, when the handover of the mobile station 200 is started, UE Inactive Timer is activated.
　次いで、基地局100Aは、UE Inactive Timerの計測時間がThdrxcommandを超えたことに伴って、DRX command MAC CEを移動局200に送信する（S120）。 Next, the base station 100A transmits a DRX command MAC CE to the mobile station 200 when the measurement time of the UE Inactive Timer exceeds Th drxcommand (S120).
　その後、基地局100Aは、移動局200からScheduling Requestを受信する（S130）。基地局100Aは、移動局200からScheduling RequestをN回受信したか否かを判定する（S140）。基地局100Aは、Scheduling RequestをN回受信した場合、移動局200にUL grantを送信する（S150）。 Thereafter, the base station 100A receives a Scheduling Request from the mobile station 200 (S130). The base station 100A determines whether or not the Scheduling Request has been received N times from the mobile station 200 (S140). When receiving the Scheduling Request N times, the base station 100A transmits a UL grant to the mobile station 200 (S150).
　なお、図３及び図４に示した動作例では、移動局200のハンドオーバー時を例として説明したが、基地局100AがScheduling Requestを受信してもUL grantの送信を中止する動作は、当該ハンドオーバー時に限定されるものではなく、DRX command MAC CEを移動局200に送信後に、移動局200から送信されたと判定されたScheduling Requestを受信した場合には、UL grantの送信を中止してもよい。 In the operation examples shown in FIG. 3 and FIG. 4, the mobile station 200 has been described as an example of handover. However, even when the base station 100A receives the Scheduling Request, the operation of canceling the UL grant transmission is It is not limited at the time of handover, and after sending DRX command MAC MAC to mobile station 200 and receiving Scheduling Request determined to have been sent from mobile station 200, even if UL grant is stopped Good.
　また、当該動作例では、基地局100AがScheduling RequestをN回受信した場合、移動局200にUL grantを送信したが、Scheduling Requestの受信回数に拘わらず、当該Scheduling Requestを無視してもよい。 In the operation example, when the base station 100A receives the Scheduling request N times, the UL request is transmitted to the mobile station 200. However, the Scheduling request may be ignored regardless of the number of times the Scheduling request is received.
　（４）作用・効果
　基地局100Aによれば、DRX制御部109によって移動局200がDRX状態であると判定された場合、移動局200からScheduling Requestを受信した場合でもUL grantの送信が中止される。このため、基地局100Aによれば、DRX command MAC CEの送信によってDRX状態に遷移した移動局が、基地局100AにおけるScheduling Requestの誤受信によってnon-DRX状態に復帰してしまうことが回避されるため、移動局200のバッテリ消耗を防止し得る。 (4) Operation / Effect According to the base station 100A, when the DRX control unit 109 determines that the mobile station 200 is in the DRX state, the UL grant transmission is stopped even when the Scheduling Request is received from the mobile station 200. The For this reason, according to the base station 100A, it is avoided that the mobile station that has transitioned to the DRX state due to the transmission of the DRX command MAC CE returns to the non-DRX state due to erroneous reception of the Scheduling Request in the base station 100A. Therefore, battery consumption of the mobile station 200 can be prevented.
　本実施形態では、移動局200から所定回数のScheduling Requestを繰り返し受信した場合、UL grantを移動局200に送信することができる。このため、移動局200からScheduling Requestを正しく受信した場合には移動局200を無線リソースにスケジューリングすることができる。 In the present embodiment, when a predetermined number of Scheduling Requests are repeatedly received from the mobile station 200, a UL grant can be transmitted to the mobile station 200. For this reason, when the Scheduling Request is correctly received from the mobile station 200, the mobile station 200 can be scheduled to a radio resource.
　より具体的には、移動局200がハンドオーバーまたは再接続を頻繁に繰り返す場合、移動局200に対して適切なタイミングでDRX command MAC CEを送信することが可能となり、その後不要なPDCCHの送信も回避されるため、移動局200のバッテリ消耗を防止し得る。つまり、送受信すべきユーザデータが存在しない場合でも、ハンドオーバーまたは再接続の手順が起動されると、基地局100Aは制御データを送信するために移動局200に対してPDCCHを送信するため、移動局200は、当該PDCCHの受信によってnon-DRX状態に遷移してしまう。 More specifically, when the mobile station 200 frequently repeats handovers or reconnections, it becomes possible to transmit DRX command MAC CE at an appropriate timing to the mobile station 200, and then unnecessary PDCCH transmissions are also possible. As a result, battery consumption of the mobile station 200 can be prevented. That is, even when there is no user data to be transmitted / received, when the handover or reconnection procedure is activated, the base station 100A transmits the PDCCH to the mobile station 200 to transmit control data. The station 200 transitions to the non-DRX state due to reception of the PDCCH.
　一旦non-DRX状態に遷移した移動局200は、再びDRX Inactivity Timerが満了するまでDRX状態に遷移することができないため、ハンドオーバーまたは再接続を頻繁に繰り返す場合、移動局200はその間DRX状態に遷移することができないこととなる。上述した実施形態によれば、このような問題も解消する。 Once the mobile station 200 has transitioned to the non-DRX state, it cannot transition to the DRX state until the DRX Inactivity Timer expires again, so if the handover or reconnection is frequently repeated, the mobile station 200 will enter the DRX state during that time. It will not be possible to transition. According to the above-described embodiment, such a problem is also solved.
　（５）その他の実施形態
　上述したように、本発明の一実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態が明らかとなろう。 (5) Other Embodiments As described above, the content of the present invention has been disclosed through one embodiment of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. should not do. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.
　図５は、本発明の変更例に係る基地局100Aと移動局200との間における通信シーケンスを示す図である。 FIG. 5 is a diagram showing a communication sequence between the base station 100A and the mobile station 200 according to the modified example of the present invention.
　図５に示すように、移動局200（UE）は、基地局100A（eNB）からPDCCHを受信する都度、DRX Inactivity Timerを（再）起動する（S210）。同様に、基地局100A（eNB）も移動局200用のDRX Inactivity Timerを（再）起動する。 As shown in FIG. 5, every time the mobile station 200 (UE) receives a PDCCH from the base station 100A (eNB), it activates (re) DRX） Inactivity Timer (S210). Similarly, base station 100A (eNB) also (re) starts DRX Inactivity Timer for mobile station 200.
　移動局200は、所定時間以上に亘ってPDCCHを受信しない場合、DRX Inactivity Timerが満了することによってDRX状態に遷移する（S220）。同様に、基地局100Aも移動局200用のDRX Inactivity Timerが満了することによって移動局200がDRX状態に遷移したと判定する。 If the mobile station 200 does not receive the PDCCH for a predetermined time or more, the mobile station 200 transitions to the DRX state when the DRX Inactivity Timer expires (S220). Similarly, the base station 100A also determines that the mobile station 200 has transitioned to the DRX state when the DRX Inactivity Timer for the mobile station 200 expires.
　移動局200がDRX状態に遷移したと判定した後、基地局100Aが他の移動局からScheduling Requestを受信したと誤って判定したとする（S230）。この場合でも、基地局100Aは、当該Scheduling Requestを無視し、移動局200に対してUL grantを送信しない。 Assume that after determining that the mobile station 200 has transitioned to the DRX state, the base station 100A erroneously determines that it has received a Scheduling Request from another mobile station (S230). Even in this case, the base station 100A ignores the Scheduling Request and does not transmit a UL grant to the mobile station 200.
　このように基地局100Aにおける移動局200用のDRX Inactivity Timerが満了し、移動局200がDRX状態に遷移したと判定されている期間において、Scheduling Requestを誤受信しても、基地局100Aは、UL grantを送信しない。このため、移動局の不必要なDRX状態からnon-DRX状態への復帰による移動局のバッテリ消耗を防止し得る。 As described above, even if the DRX Inactivity Timer for the mobile station 200 in the base station 100A expires and the mobile station 200 is determined to have transitioned to the DRX state, even if the SchedulingulRequest is erroneously received, the base station 100A Do not send UL grant. For this reason, it is possible to prevent the mobile station from draining the battery due to the mobile station returning from the unnecessary DRX state to the non-DRX state.
　また、上述した本発明の実施形態では、移動局200から所定回数のScheduling Requestを繰り返し受信した場合、UL grantを移動局200に送信していたが、このような動作は必ずしも実行しなくても構わない。例えば、初回のScheduling Requestを受信した後、所定時間経過するまでに再度Scheduling Requestを受信した場合、UL grantを移動局200に送信してもよい。 Further, in the above-described embodiment of the present invention, when the scheduling request is repeatedly received from the mobile station 200, the UL request is transmitted to the mobile station 200. However, such an operation is not necessarily performed. I do not care. For example, after receiving the first Scheduling request, the UL request may be transmitted to the mobile station 200 when the Scheduling request is received again by a predetermined time.
　また、上述した実施形態では、基地局100AがDRX command MAC CEの送信に関する処理を実行していたが、このような処理の全部または一部は、他の通信装置（例えば、MME）において実行するようにしてもよい。 Further, in the above-described embodiment, the base station 100A executes processing related to transmission of DRX command MAC CE, but all or part of such processing is executed in another communication device (for example, MME). You may do it.
　このように、本発明は、ここでは記載していない様々な実施の形態などを含むことは勿論である。したがって、本発明の技術的範囲は、上述の説明から妥当な請求の範囲に係る発明特定事項によってのみ定められるものである。 Thus, it goes without saying that the present invention includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the appropriate claims from the above description.
　なお、日本国特許出願第２０１１－２２７１４８号（２０１１年１０月１４日出願）の全内容が、参照により、本願明細書に組み込まれている。 Note that the entire contents of Japanese Patent Application No. 2011-227148 (filed on October 14, 2011) are incorporated herein by reference.
　本発明の特徴によれば、移動局がDRX状態であると判定されている場合において、Scheduling Requestの誤受信による移動局の不必要なDRX状態からnon-DRX状態への復帰による移動局のバッテリ消耗、及びDRX状態の移動局に対する不要なスケジューリングを防止し得る基地局及び通信制御方法を提供することができる。 According to the characteristics of the present invention, when the mobile station is determined to be in the DRX state, the battery of the mobile station by returning from the unnecessary DRX state to the non-DRX state due to erroneous reception of Scheduling Request It is possible to provide a base station and a communication control method that can prevent exhaustion and unnecessary scheduling for a mobile station in a DRX state.
　50…コアネットワーク
　100A, 100B…基地局
　101…無線通信部
　103…データ送受信部
　105…スケジューリング部
　107…タイマ制御部
　109…DRX制御部
　200…移動局
　C1, C2…セル 50 ... Core network 100A, 100B ... Base station 101 ... Wireless communication unit 103 ... Data transmission / reception unit 105 ... Scheduling unit 107 ... Timer control unit 109 ... DRX control unit 200 ... Mobile station C1, C2 ... Cell

Claims (6)

  1. 　移動局から受信した前記移動局の上り方向におけるScheduling Requestに応じて、上り方向におけるユーザデータの送信を許可するUL grantを前記移動局に送信する基地局であって、
    　制御チャネルを間欠的に受信するDRX状態に前記移動局を制御するDRX制御部と、
    　前記Scheduling Requestに基づいて前記移動局を所定の無線リソースブロックにスケジューリングするスケジューリング処理部と
    を備え、
    　前記スケジューリング処理部は、前記DRX制御部によって前記移動局がDRX状態であると判定されている場合、前記移動局から送信されたと判定されたScheduling Requestを受信してもUL grantの送信を中止する基地局。     In response to a scheduling request in the uplink direction of the mobile station received from the mobile station, a base station that transmits a UL grant that permits transmission of user data in the uplink direction to the mobile station,
    A DRX control unit for controlling the mobile station in a DRX state for intermittently receiving a control channel;
    A scheduling processor that schedules the mobile station to a predetermined radio resource block based on the Scheduling Request;
    When the DRX control unit determines that the mobile station is in the DRX state, the scheduling processing unit stops UL grant transmission even if it receives a Scheduling Request determined to be transmitted from the mobile station base station.
  2. 　前記DRX制御部は、前記移動局をDRX状態に制御するDRX command MAC CEを前記移動局に送信し、
    　前記スケジューリング処理部は、前記DRX制御部が前記DRX command MAC CEを送信する場合、前記移動局から送信されたと判定されたScheduling Requestを受信した場合でもUL grantの送信を中止する請求項１に記載の基地局。     The DRX control unit transmits a DRX command MAC CE for controlling the mobile station to a DRX state to the mobile station,
    2. The UL scheduling transmission unit according to claim 1, wherein when the DRX control unit transmits the DRX command MAC CE, the scheduling processing unit stops transmitting UL grant even when receiving a Scheduling Request determined to be transmitted from the mobile station. Base station.
  3. 　前記スケジューリング処理部は、前記移動局から所定回数の前記Scheduling Requestを繰り返し受信した場合、前記UL grantを前記移動局に送信する請求項１に記載の基地局。 The base station according to claim 1, wherein the scheduling processing unit transmits the UL grant to the mobile station when the scheduling request is repeatedly received from the mobile station a predetermined number of times.
  4. 　前記スケジューリング処理部は、前記移動局のハンドオーバーまたは再接続手順の開始後に、前記DRX制御部が前記DRX command MAC CEを送信することを決定した場合、前記UL grantの送信を中止する請求項１に記載の基地局。 The scheduling processing unit stops transmission of the UL grant when the DRX control unit decides to transmit the DRX command, MAC, CE after the start of a handover or reconnection procedure of the mobile station. Base station described in.
  5. 　前記スケジューリング処理部は、前記移動局のハンドオーバーまたは再接続手順の開始後に、前記DRX制御部が前記DRX command MAC CEを送信することを決定した場合において、前記移動局から所定回数の前記Scheduling Requestを繰り返し受信した場合、前記UL grantを前記移動局に送信する請求項３に記載の基地局。 When the DRX control unit determines to transmit the DRX-command-MAC-CE after the start of a handover or reconnection procedure of the mobile station, the scheduling processing unit requests the scheduling request from the mobile station a predetermined number of times. The base station according to claim 3, wherein the UL を grant is transmitted to the mobile station when it is repeatedly received.
  6. 　移動局から受信した前記移動局の上り方向におけるScheduling Requestに応じて、上り方向におけるユーザデータの送信を許可するUL grantを前記移動局に送信する通信制御方法であって、
    　通信装置が、制御チャネルを間欠的に受信するDRX状態に前記移動局を制御するステップと、
    　前記通信装置が、前記Scheduling Requestに基づいて前記移動局を所定の無線リソースブロックにスケジューリングするステップと
    を備え、
    　前記スケジューリングするステップでは、前記移動局がDRX状態であると判定されている場合、前記移動局から送信されたと判定されたScheduling Requestを受信してもUL grantの送信を中止する通信制御方法。     In response to a scheduling request in the uplink direction of the mobile station received from a mobile station, a communication control method for transmitting a UL grant that permits transmission of user data in the uplink direction to the mobile station,
    A step of controlling the mobile station in a DRX state in which a communication device intermittently receives a control channel;
    The communication device comprises scheduling the mobile station to a predetermined radio resource block based on the Scheduling Request;
    In the scheduling step, when it is determined that the mobile station is in a DRX state, a communication control method for canceling transmission of a UL grant even when receiving a Scheduling Request determined to be transmitted from the mobile station.
PCT/JP2012/076334 2011-10-14 2012-10-11 Base station and communication control method WO2013054850A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011227148A JP5792580B2 (en) 2011-10-14 2011-10-14 Base station and communication control method
JP2011-227148 2011-10-14

Publications (1)

Publication Number Publication Date
WO2013054850A1 true WO2013054850A1 (en) 2013-04-18

Family

ID=48081901

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/076334 WO2013054850A1 (en) 2011-10-14 2012-10-11 Base station and communication control method

Country Status (2)

Country Link
JP (1) JP5792580B2 (en)
WO (1) WO2013054850A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3225068A4 (en) * 2014-11-28 2018-07-04 Telefonaktiebolaget LM Ericsson (publ) False scheduling request prevention
CN109548146A (en) * 2017-08-02 2019-03-29 阿里巴巴集团控股有限公司 The means of communication and device
RU2729202C1 (en) * 2017-01-10 2020-08-05 Гуандун Оппо Мобайл Телекоммьюникейшнс Корп., Лтд. Method of determining intermittent reception state, terminal device and network device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106465270B (en) * 2014-05-15 2020-07-21 株式会社Ntt都科摩 User terminal and wireless communication method
CN110447295B (en) 2017-03-22 2023-02-17 Lg 电子株式会社 Method and user equipment for performing beam recovery, and method and base station for supporting the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011111111A1 (en) * 2010-03-12 2011-09-15 富士通株式会社 Communication section setting method, relay station and mobile communication system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080067293A (en) * 2007-01-15 2008-07-18 삼성전자주식회사 Method and apparatus for drx resume after up-link data transmission in mobile telecommunication system
US20090176502A1 (en) * 2008-01-08 2009-07-09 Richard Lee-Chee Kuo Method of Receiving Signaling and Related Communication Device
US8265682B2 (en) * 2008-03-18 2012-09-11 Texas Instruments Incorporated Scheduling request usage in DRX mode in wireless networks

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011111111A1 (en) * 2010-03-12 2011-09-15 富士通株式会社 Communication section setting method, relay station and mobile communication system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3225068A4 (en) * 2014-11-28 2018-07-04 Telefonaktiebolaget LM Ericsson (publ) False scheduling request prevention
US10660116B2 (en) 2014-11-28 2020-05-19 Telefonaktiebolaget Lm Ericsson (Publ) False scheduling request prevention
RU2729202C1 (en) * 2017-01-10 2020-08-05 Гуандун Оппо Мобайл Телекоммьюникейшнс Корп., Лтд. Method of determining intermittent reception state, terminal device and network device
US11096238B2 (en) 2017-01-10 2021-08-17 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for determining a discontinuous reception state, terminal device and network device
CN109548146A (en) * 2017-08-02 2019-03-29 阿里巴巴集团控股有限公司 The means of communication and device
CN109548146B (en) * 2017-08-02 2023-10-27 阿里巴巴集团控股有限公司 Communication method and device

Also Published As

Publication number Publication date
JP2013090058A (en) 2013-05-13
JP5792580B2 (en) 2015-10-14

Similar Documents

Publication Publication Date Title
US9241308B2 (en) Discontinuous reception method and user equipment using the same
JP2022031847A (en) Method and apparatus for beam management in wireless communication system
KR101053841B1 (en) How to improve discontinuous reception and related communication equipment
CN106465270B (en) User terminal and wireless communication method
JP6842535B2 (en) Active time processing in 2-step grant
US8532006B2 (en) Discontinuous reception with user equipment based mobility
US20110003555A1 (en) Method and Apparatus for PDCCH Monitoring
KR101676976B1 (en) Power preference indicator timer
US8787227B2 (en) Discontinuous reception with user equipment based mobility
JP2018501712A (en) Latency reduction for user equipment with bursty interactive traffic
US20220417995A1 (en) Resource conflict processing method and device, storage medium, terminal, and base station
JP5792580B2 (en) Base station and communication control method
US20230362881A1 (en) Methods and apparatuses for a relay reselection and data transmission handling procedure in a ue-to-network relay scenario
US20220078715A1 (en) Methods and apparatuses for using power-saving signal pattern, device and system
WO2012131568A2 (en) Discontinuous reception with user equipment based mobility
JP5802107B2 (en) Base station and communication control method
EP4226675A1 (en) Mobility for small data transmission procedure
JP5860635B2 (en) Base station and communication control method
JP5678194B2 (en) Base station and communication control method
JP6031039B2 (en) Base station and communication control method
US9585130B2 (en) Method and apparatus for uplink communication
JP6162987B2 (en) Base station and method
JP7431991B2 (en) Data reception without control channel monitoring
US20240064855A1 (en) Sidelink Discontinuous Reception at a User Equipment
JP6259541B2 (en) Discontinuous reception method and user equipment using discontinuous reception method

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12839936

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12839936

Country of ref document: EP

Kind code of ref document: A1