WO2013021603A1 - Radio base station, wireless communication system, and wireless communication method - Google Patents

Radio base station, wireless communication system, and wireless communication method Download PDF

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Publication number
WO2013021603A1
WO2013021603A1 PCT/JP2012/004950 JP2012004950W WO2013021603A1 WO 2013021603 A1 WO2013021603 A1 WO 2013021603A1 JP 2012004950 W JP2012004950 W JP 2012004950W WO 2013021603 A1 WO2013021603 A1 WO 2013021603A1
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radio
base station
scheduler function
terminal
resource allocation
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PCT/JP2012/004950
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French (fr)
Japanese (ja)
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昌英 片山
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京セラ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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

Definitions

  • the present invention relates to a radio base station, a radio communication system, and a radio communication method.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • radio resources used for radio communication between a radio base station and a radio terminal are allocated in units of resource blocks.
  • the radio base station and the radio terminal execute data uplink transfer and downlink transfer using assigned radio resources.
  • Radio resources are allocated according to channel quality of radio communication, data transmission amount, and the like.
  • SR Scheduling Request is transmitted to the radio base station (see Non-Patent Document 1).
  • the radio base station that has received the SR executes the scheduler function and allocates uplink radio resources to the radio terminal that has transmitted the SR.
  • an uplink grant which is radio resource allocation information, is transmitted from the radio base station to the radio terminal.
  • the wireless terminal When the wireless terminal receives the uplink grant, the wireless terminal recognizes that the uplink wireless resource allocation has been completed.
  • the radio terminal transmits data using an uplink radio resource corresponding to the uplink grant.
  • uplink radio resources cannot be allocated to the radio terminal due to the radio link being congested in the radio base station. If uplink radio resources cannot be allocated in the radio base station, the SR is transmitted again from the radio terminal.
  • an object of the present invention made in view of the above problems is to provide a radio base station, a radio communication system, and a radio communication method that reduce repeated transmission of SR from a radio terminal.
  • a radio base station In order to solve the above-described problems, a radio base station according to the present invention A wireless base station that communicates with a wireless terminal, A scheduling unit that executes a scheduler function for allocating uplink radio resources to the radio terminal; Causing the scheduling unit to execute the scheduler function when receiving a radio resource allocation request transmitted from the radio terminal, and retrying the scheduler function when the scheduling unit fails to allocate the uplink radio resource And a control unit for controlling the operation.
  • the radio base station It is preferable that the number of retries of the scheduler function for a single radio resource allocation request is determined as the first number.
  • the radio base station The first number is preferably set according to a transmission interval of the radio resource allocation request of the radio terminal.
  • the radio base station The retry of the scheduler function is preferably performed at a shortest transmission time interval determined in a radio communication system including the radio base station.
  • a wireless communication system includes: A wireless terminal that transmits a wireless resource allocation request; A scheduling unit that executes a scheduler function for allocating uplink radio resources to the radio terminal, and when receiving the radio resource allocation request transmitted from the radio terminal, causes the scheduling unit to execute the scheduler function And a radio base station having a control unit for retrying the scheduler function when the scheduling unit cannot allocate the uplink radio resource.
  • the solution of the present invention has been described as a radio base station and a radio communication system.
  • the present invention can also be realized as a method, a program, and a storage medium recording the program substantially corresponding to these. It should be understood that these are included in the scope of the present invention.
  • a wireless communication method that implements the present invention as a method, A transmission step of transmitting a radio resource allocation request; An execution step of executing a scheduler function of allocating uplink radio resources when receiving the radio resource allocation request; The execution step comprises a retry step of retrying the scheduler function when the uplink radio resource cannot be allocated.
  • the scheduler function is retried when the uplink radio resource cannot be allocated.
  • the unnecessary transmission of the SR again becomes unnecessary.
  • FIG. 1 is a schematic configuration diagram of a wireless communication system having a wireless base station according to an embodiment of the present invention.
  • the wireless communication system 1 is based on, for example, LTE.
  • different radio resource blocks are assigned to a plurality of radio terminals 20 (only a single radio terminal is shown in FIG. 1) by the radio base station 10 according to the present embodiment.
  • Wireless communication is performed between the station 10 and the plurality of wireless terminals 20.
  • the wireless terminal 20 includes a wireless communication unit 21 and a control unit 22.
  • the wireless communication unit 21 performs wireless communication with the wireless base station 10. That is, the wireless communication unit 21 receives downlink data. Further, the radio communication unit 21 transmits uplink data to the radio base station 10 using radio resources allocated by the radio base station 10. Further, the radio communication unit 21 can transmit an SR to the radio base station 10 and receive an uplink grant.
  • the control unit 22 controls each part of the wireless terminal 20 according to the downlink data. Further, uplink data transmitted from the wireless communication unit 21 is generated by the control unit 22 according to the operation of each part of the wireless terminal 20 and transmitted to the wireless communication unit 21.
  • control unit 22 generates SR when transmitting BSR and PHR, and transmits the SR to the wireless communication unit 21.
  • the SR transmission interval Tsr can be set for each radio terminal 20 and is transmitted to the radio base station 10 together with the SR.
  • control unit 22 recognizes an uplink radio resource for transmitting uplink data based on an uplink grant generated based on the SR in the radio base station 10.
  • the radio base station 10 includes a radio communication unit 11, a control unit 12, a scheduling unit 13, a ROM 14, a counter 15, and the like.
  • the wireless communication unit 11 performs wireless communication with the wireless terminal 20. That is, the wireless communication unit 11 transmits downlink data. Further, the radio communication unit 11 receives uplink data transmitted from the radio terminal 20 using radio resources allocated by the radio base station 10. Further, the radio communication unit 11 receives the SR transmitted by the radio terminal 20 and transmits an uplink grant that is radio resource allocation information.
  • Uplink data is transmitted from the wireless communication unit 11 to the control unit 12.
  • the control unit 12 transmits uplink data to a network (not shown). Further, the control unit 12 transmits downlink data to be transmitted to the wireless terminal received from the network to the wireless communication unit 11.
  • the SR is transmitted from the wireless communication unit 11 to the control unit 12.
  • the control unit 12 causes the scheduling unit 13 to execute the scheduler function.
  • the scheduler function By executing the scheduler function, uplink radio resources are allocated to the radio terminal 20 that has transmitted the SR.
  • an uplink grant that is allocation information of the radio resource allocated by the scheduling unit 13 is generated.
  • the generated uplink grant is transmitted to the wireless communication unit 11.
  • the radio base station 10 transmits / receives uplink data and downlink data to / from a plurality of radio terminals 20. Therefore, radio link congestion, that is, the free capacity of radio resources, may be insufficient for allocation of new radio resources. In such a case, the scheduling unit 13 cannot allocate uplink radio resources.
  • the control unit 12 determines whether the assignment is completed when the scheduling unit 13 executes the scheduler function. If the allocation is impossible, the control unit 12 causes the scheduling unit 13 to retry the scheduler function after the first time has elapsed.
  • the first time is determined, for example, as a processing unit time defined in the wireless communication system 1, for example, a subframe (1 ms) in a wireless frame.
  • control unit 12 causes the scheduling unit 13 to retry the scheduler function until the uplink radio resource allocation is completed or the number of allocation failures reaches the first number.
  • a counter 15 is connected to the control unit 12, and the counter 15 detects the number of executions of the scheduler function.
  • the first number is changed according to the SR transmission interval Tsr for each radio terminal 20.
  • the first number of times Nrt is the SR transmission interval Tsr (ms) from the radio terminal 20, the first time Trt (ms), from the time of transmission from the uplink grant radio base station 10 until the radio terminal 20 receives it.
  • the time Ttr is determined so as to satisfy Tsr> Nrt ⁇ Trt + Ttr.
  • the first number of times corresponding to the SR transmission interval Tsr is stored in the ROM 14 as table data. As described above, since the transmission interval Tsr is notified together with the SR, the number of times corresponding to the transmission time notified when the SR is received is read out by the control unit 12.
  • processing for radio resource allocation executed by the radio base station 10 when receiving SR from the radio terminal 20 will be described with reference to the flowchart of FIG. Note that the processing for radio resource allocation starts when the radio base station 10 receives the SR transmitted from the radio terminal 20.
  • step S100 the control unit 12 recognizes the transmission interval Tsr received together with the SR. After recognizing the transmission interval Tsr, the process proceeds to step S101.
  • step S101 the control unit 12 resets the number of executions of the scheduler function in the counter 14 to zero. Once reset to zero, the process proceeds to step S102.
  • step S102 the control unit 12 reads the number of times corresponding to the time interval Tsr recognized in step S100 from the ROM 14, and sets it to the first number. After setting the first number of times, the process proceeds to step S103.
  • step S103 the control unit 12 causes the scheduling unit 13 to execute a scheduler function. After execution of the scheduler function, the process proceeds to step S104.
  • step S104 the control unit 12 determines whether or not the allocation of the uplink radio resource is completed. If the assignment is not complete, the process proceeds to step S105. When the assignment is complete, the process proceeds to step S107.
  • step S105 the control unit 12 controls the counter 15 to increment the scheduler function execution count by +1.
  • step S106 the control unit 12 determines whether or not the number of executions is less than the first number set in step S102. If it is less than the first number, the process returns to step S105. On the other hand, when the first number of times has been reached, the control unit 12 abandons the allocation of radio resources and ends the process for allocation.
  • step S107 the control unit 12 generates an uplink grant according to the radio resource allocated to the scheduling unit 13. Further, in the next step S108, the control unit 12 causes the wireless communication unit 11 to transmit an uplink grant. After transmission of the uplink grant, the process for allocation is terminated.
  • the radio base station 10 of the present embodiment configured as described above, it is possible to retry uplink radio resource allocation a plurality of times for the first SR received from the radio terminal 20 as described above. Is possible. Therefore, useless repetition of SR transmission from the radio terminal 20 can be reduced.
  • FIG. 3 is a timing chart for explaining processing of radio resource allocation between a conventional radio base station and a radio terminal.
  • FIG. 4 is a timing chart for explaining processing of radio resource allocation between the radio base station and the radio terminal in the present embodiment.
  • the scheduler function has been tried once for a single SR transmission from the radio terminal. If the radio resource cannot be allocated after the scheduler function is implemented, the uplink grant is not transmitted. Therefore, if the radio terminal cannot receive the uplink grant, it transmits another SR when a predetermined time interval Tsr has elapsed since the previous SR transmission.
  • the trial of the SR transmission and the scheduler function is repeated until the allocation of radio resources is completed in the radio base station.
  • an uplink grant is transmitted from the radio base station, and transmission of uplink data from the radio terminal is started. Therefore, it takes at least (SR transmission count) ⁇ (SR transmission interval) to start transmission of uplink data after transmission of SR.
  • the upper limit value of the retry count of the scheduler function is determined for one SR reception. Therefore, it is possible to prevent an excessive load from being applied to the radio base station 10 while shortening the time until the radio resource allocation is completed. As described above, it is possible to shorten the time taken to complete the allocation of radio resources by retrying the scheduler function.
  • the load on the radio base station 10 increases as the number of retries increases. Therefore, it is possible to prevent an extreme increase in the load on the radio base station 10 by setting an upper limit value as in this embodiment.
  • the first number that is the upper limit value of the number of retries can be appropriately changed according to the SR transmission interval Tsr from the radio terminal 20.
  • the scheduler function is retried according to the first SR even if the second and subsequent SRs are received. May be repeated.
  • the first time is configured to be the processing unit time defined in the wireless communication system 1, but is not limited to the processing unit time. If the time is shorter than the shortest SR transmission interval by the wireless terminal 20, the same effect as in the present embodiment can be obtained.

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

Abstract

A radio base station (10) has a scheduling unit (13) and a control unit (12). The radio base station (10) communicates with a radio terminal (20). The scheduling unit (13) executes a scheduler function to allocate an uplink radio resource to the radio terminal (20). When a radio resource allocation request is received from the radio terminal (20), the control unit (12) causes the scheduling unit to execute the scheduler function. If the scheduling unit has failed to perform the uplink radio resource allocation, then the control unit (12) causes the scheduling unit (13) to retry the scheduler function.

Description

無線基地局、無線通信システム、及び無線通信方法Wireless base station, wireless communication system, and wireless communication method 関連出願の相互参照Cross-reference of related applications
　本出願は、２０１１年８月５日に日本国に特許出願された特願２０１１－１７２１８７の優先権を主張するものであり、この先の出願の開示全体をここに参照のために取り込む。 This application claims the priority of Japanese Patent Application No. 2011-172187 filed in Japan on August 5, 2011, and the entire disclosure of this earlier application is incorporated herein by reference.
　本発明は、無線基地局、無線通信システム、及び無線通信方法に関するものである。 The present invention relates to a radio base station, a radio communication system, and a radio communication method.
　無線通信方式として、ＬＴＥ（Ｌｏｎｇ　Ｔｅｒｍ　Ｅｖｏｌｕｔｉｏｎ）システムが、３ＧＰＰ（３ｒｄ　Ｇｅｎｅｒａｔｉｏｎ　Ｐａｒｔｎｅｒｓｈｉｐ　Ｐｒｏｊｅｃｔ）によって規格化されている。ＬＴＥでは、リソースブロックを単位として、無線基地局と無線端末との無線通信に使用する無線リソースが割当てられる。無線基地局と無線端末とは割当てられた無線リソースを用いてデータの上り転送及び下り転送を実行する。無線リソースは無線通信のチャネル品質やデータ伝送量などに応じて割当てられる。 As a wireless communication system, LTE (Long Term Evolution) system is standardized by 3GPP (3rd Generation Partnership Project). In LTE, radio resources used for radio communication between a radio base station and a radio terminal are allocated in units of resource blocks. The radio base station and the radio terminal execute data uplink transfer and downlink transfer using assigned radio resources. Radio resources are allocated according to channel quality of radio communication, data transmission amount, and the like.
　無線端末がバッファ状態報告（ＢＳＲ：　Ｂｕｆｆｅｒ　Ｓｔａｔｕｓ　Ｒｅｐｏｒｔ）及び電力ヘッドルーム報告（ＰＨＲ：　Ｐｏｗｅｒ　Ｈｅａｄｒｏｏｍ　Ｒｅｐｏｒｔ）等を送信するために上りリンク無線リソースを必要とするときに、無線端末は無線リソース割当て要求（ＳＲ：　Ｓｃｈｅｄｕｌｉｎｇ　Ｒｅｑｕｅｓｔ）を無線基地局に送信する（非特許文献１参照）。 When a radio terminal needs uplink radio resources to transmit a buffer status report (BSR: Buffer Status Report), a power headroom report (PHR: Power Headroom Report), etc., the radio terminal requests a radio resource allocation ( SR: Scheduling Request is transmitted to the radio base station (see Non-Patent Document 1).
　ＳＲを受信した無線基地局はスケジューラ機能を実行し、ＳＲを送信した無線端末に対する上りリンク無線リソースを割当てる。上りリンク無線リソースの割当てを完了すると、無線リソース割当情報であるアップリンクグラントが無線基地局から無線端末に送信される。 The radio base station that has received the SR executes the scheduler function and allocates uplink radio resources to the radio terminal that has transmitted the SR. When the uplink radio resource allocation is completed, an uplink grant, which is radio resource allocation information, is transmitted from the radio base station to the radio terminal.
　無線端末がアップリンクグラントを受信すると、無線端末では上りリンク無線リソース割当てが完了したことが認識される。無線端末は、アップリンクグラントに応じた上りリンク無線リソースを用いてデータを送信する。 When the wireless terminal receives the uplink grant, the wireless terminal recognizes that the uplink wireless resource allocation has been completed. The radio terminal transmits data using an uplink radio resource corresponding to the uplink grant.
　しかし、無線基地局において無線リンクが混雑している等の理由により、無線端末への上りリンク無線リソースの割当てが出来ないことがある。無線基地局において上り無線リソースの割当てが出来ないと、無線端末から再度ＳＲが送信されることになる。 However, there are cases where uplink radio resources cannot be allocated to the radio terminal due to the radio link being congested in the radio base station. If uplink radio resources cannot be allocated in the radio base station, the SR is transmitted again from the radio terminal.
　従って、上記のような問題点に鑑みてなされた本発明では、無線端末からのＳＲの繰返し送信を低減化させる無線基地局、無線通信システム、及び無線通信方法の提供を目的とする。 Therefore, an object of the present invention made in view of the above problems is to provide a radio base station, a radio communication system, and a radio communication method that reduce repeated transmission of SR from a radio terminal.
　上述した諸課題を解決すべく、本発明による無線基地局は、
　無線端末と通信する無線基地局であって、
　前記無線端末に対して上りリンク無線リソースの割当てをするスケジューラ機能を実行するスケジューリング部と、
　前記無線端末から送信される無線リソース割当て要求を受信する場合に前記スケジューリング部に前記スケジューラ機能を実行させ、前記スケジューリング部が前記上りリンク無線リソースの割当てを出来なかった場合に前記スケジューラ機能を再試行させる制御部とを備える
　ことを特徴とするものである。 In order to solve the above-described problems, a radio base station according to the present invention
A wireless base station that communicates with a wireless terminal,
A scheduling unit that executes a scheduler function for allocating uplink radio resources to the radio terminal;
Causing the scheduling unit to execute the scheduler function when receiving a radio resource allocation request transmitted from the radio terminal, and retrying the scheduler function when the scheduling unit fails to allocate the uplink radio resource And a control unit for controlling the operation.
　また、当該無線基地局は、
　単一の前記無線リソース割当て要求に対する前記スケジューラ機能の再試行の試行回数が第１の回数に定められる
　ことが好ましい。 In addition, the radio base station
It is preferable that the number of retries of the scheduler function for a single radio resource allocation request is determined as the first number.
　また、当該無線基地局は、
　前記第１の回数は前記無線端末の前記無線リソース割当て要求の送信間隔に応じて設定される
　ことが好ましい。 In addition, the radio base station
The first number is preferably set according to a transmission interval of the radio resource allocation request of the radio terminal.
　また、当該無線基地局は、
　前記スケジューラ機能の再試行は、前記無線基地局を含む無線通信システムにおいて定められる最短の伝送時間間隔で行われる
　ことが好ましい。 In addition, the radio base station
The retry of the scheduler function is preferably performed at a shortest transmission time interval determined in a radio communication system including the radio base station.
　また、本発明による無線通信システムは、
　無線リソース割当て要求を送信する無線端末と、
　前記無線端末に対して上りリンク無線リソースの割当てをするスケジューラ機能を実行するスケジューリング部と、前記無線端末から送信される前記無線リソース割当て要求を受信する場合に前記スケジューリング部に前記スケジューラ機能を実行させ且つ前記スケジューリング部が前記上りリンク無線リソースの割当てを出来なかった場合に前記スケジューラ機能を再試行させる制御部とを有する無線基地局とを備える
　を備えることを特徴とする。 A wireless communication system according to the present invention includes:
A wireless terminal that transmits a wireless resource allocation request;
A scheduling unit that executes a scheduler function for allocating uplink radio resources to the radio terminal, and when receiving the radio resource allocation request transmitted from the radio terminal, causes the scheduling unit to execute the scheduler function And a radio base station having a control unit for retrying the scheduler function when the scheduling unit cannot allocate the uplink radio resource.
　上述したように本発明の解決手段を無線基地局及び無線通信システムとして説明してきたが、本発明はこれらに実質的に相当する方法、プログラム、プログラムを記録した記憶媒体としても実現し得るものであり、本発明の範囲にはこれらも包含されるものと理解されたい。 As described above, the solution of the present invention has been described as a radio base station and a radio communication system. However, the present invention can also be realized as a method, a program, and a storage medium recording the program substantially corresponding to these. It should be understood that these are included in the scope of the present invention.
　また、本発明を方法として実現させた無線通信方法は、
　無線リソース割当て要求を送信する送信ステップと、
　前記無線リソース割当て要求を受信する場合に上りリンク無線リソースの割当てをするスケジューラ機能を実行する実行ステップと、
　前記実行ステップにおいて、前記上りリンク無線リソースの割当てをできなかった場合に前記スケジューラ機能を再試行する再試行ステップと
　を備えることを特徴とする。 In addition, a wireless communication method that implements the present invention as a method,
A transmission step of transmitting a radio resource allocation request;
An execution step of executing a scheduler function of allocating uplink radio resources when receiving the radio resource allocation request;
The execution step comprises a retry step of retrying the scheduler function when the uplink radio resource cannot be allocated.
　上記のように構成された本発明に係る無線基地局、無線通信システム、及び無線通信方法によれば、上りリンク無線リソースの割当てが出来ない場合にスケジューラ機能を再試行させるので、無線端末からの再度のＳＲの無駄な送信が不要となる。 According to the radio base station, radio communication system, and radio communication method according to the present invention configured as described above, the scheduler function is retried when the uplink radio resource cannot be allocated. The unnecessary transmission of the SR again becomes unnecessary.
本発明の一実施形態に係る無線通信システムの概略構成を示す図である。It is a figure which shows schematic structure of the radio | wireless communications system which concerns on one Embodiment of this invention. 無線基地局で実行される上りリンク無線リソース割当てのための処理を示すフローチャートである。It is a flowchart which shows the process for the uplink radio | wireless resource allocation performed with a radio base station. 従来の無線基地局と無線端末間における無線リソース割当ての処理について説明するためのタイミングチャートである。It is a timing chart for demonstrating the process of the radio | wireless resource allocation between the conventional radio base station and a radio | wireless terminal. 本実施形態の無線基地局と無線端末間における無線リソース割当ての処理について説明するためのタイミングチャートである。It is a timing chart for demonstrating the process of radio | wireless resource allocation between the radio base station and radio | wireless terminal of this embodiment.
　以下、本発明を適用した無線基地局及び無線通信システムの実施形態について、図面を参照して説明する。 Hereinafter, embodiments of a radio base station and a radio communication system to which the present invention is applied will be described with reference to the drawings.
　図１は、本発明の一実施形態に係る無線基地局を有する無線通信システムの概略構成図である。無線通信システム１は、例えばＬＴＥに準拠するものである。無線通信システム１においては、本実施形態に係る無線基地局１０により複数の無線端末２０（図１においては単一の無線端末のみ示す）に対して、それぞれ異なる無線リソースブロックが割当てられ、無線基地局１０と複数の無線端末２０との間で無線通信を行うものである。 FIG. 1 is a schematic configuration diagram of a wireless communication system having a wireless base station according to an embodiment of the present invention. The wireless communication system 1 is based on, for example, LTE. In the radio communication system 1, different radio resource blocks are assigned to a plurality of radio terminals 20 (only a single radio terminal is shown in FIG. 1) by the radio base station 10 according to the present embodiment. Wireless communication is performed between the station 10 and the plurality of wireless terminals 20.
　無線端末２０は、無線通信部２１と制御部２２とを備える。無線通信部２１は無線基地局１０と無線通信を行う。すなわち、無線通信部２１はダウンリンクデータを受信する。また、無線通信部２１は、無線基地局１０が割当てた無線リソースを用いて、無線基地局１０にアップリンクデータを送信する。さらに、無線通信部２１は、無線基地局１０にＳＲを送信し、アップリンクグラントを受信可能である。 The wireless terminal 20 includes a wireless communication unit 21 and a control unit 22. The wireless communication unit 21 performs wireless communication with the wireless base station 10. That is, the wireless communication unit 21 receives downlink data. Further, the radio communication unit 21 transmits uplink data to the radio base station 10 using radio resources allocated by the radio base station 10. Further, the radio communication unit 21 can transmit an SR to the radio base station 10 and receive an uplink grant.
　無線通信部２１がダウンリンクデータを受信すると、制御部２２においてダウンリンクデータに応じて無線端末２０の各部位を制御する。また、無線通信部２１から送信されるアップリンクデータは無線端末２０の各部位の動作に応じて制御部２２によって生成され、無線通信部２１に送信される。 When the wireless communication unit 21 receives the downlink data, the control unit 22 controls each part of the wireless terminal 20 according to the downlink data. Further, uplink data transmitted from the wireless communication unit 21 is generated by the control unit 22 according to the operation of each part of the wireless terminal 20 and transmitted to the wireless communication unit 21.
　さらに、制御部２２はＢＳＲ及びＰＨＲを送信する場合にＳＲを生成し、無線通信部２１に送信する。なお、ＳＲの送信間隔Ｔｓｒは無線端末２０毎に設定可能であり、ＳＲとともに無線基地局１０に送信される。 Further, the control unit 22 generates SR when transmitting BSR and PHR, and transmits the SR to the wireless communication unit 21. The SR transmission interval Tsr can be set for each radio terminal 20 and is transmitted to the radio base station 10 together with the SR.
　また、制御部２２は、後述するように、無線基地局１０においてＳＲに基づいて生成されるアップリンクグラントに基づいて、アップリンクデータを送信するための上りリンク無線リソースを認識する。 Further, as will be described later, the control unit 22 recognizes an uplink radio resource for transmitting uplink data based on an uplink grant generated based on the SR in the radio base station 10.
　無線基地局１０は、無線通信部１１、制御部１２、スケジューリング部１３、ＲＯＭ１４、及びカウンタ１５等を備える。 The radio base station 10 includes a radio communication unit 11, a control unit 12, a scheduling unit 13, a ROM 14, a counter 15, and the like.
　無線通信部１１は無線端末２０と無線通信を行う。すなわち、無線通信部１１はダウンリンクデータを送信する。また、無線通信部１１は、無線基地局１０が割当てた無線リソースを用いて、無線端末２０が送信するアップリンクデータを受信する。さらに、無線通信部１１は無線端末２０が送信するＳＲを受信し、無線リソースの割当て情報であるアップリンクグラントを送信する。 The wireless communication unit 11 performs wireless communication with the wireless terminal 20. That is, the wireless communication unit 11 transmits downlink data. Further, the radio communication unit 11 receives uplink data transmitted from the radio terminal 20 using radio resources allocated by the radio base station 10. Further, the radio communication unit 11 receives the SR transmitted by the radio terminal 20 and transmits an uplink grant that is radio resource allocation information.
　無線通信部１１から制御部１２に、アップリンクデータが送信される。制御部１２は、アップリンクデータをネットワーク（図示せず）に送信する。また、制御部１２はネットワークから受信した無線端末に送信すべきダウンリンクデータを無線通信部１１に送信する。 Uplink data is transmitted from the wireless communication unit 11 to the control unit 12. The control unit 12 transmits uplink data to a network (not shown). Further, the control unit 12 transmits downlink data to be transmitted to the wireless terminal received from the network to the wireless communication unit 11.
　また、無線通信部１１から制御部１２に、ＳＲが送信される。制御部１２はＳＲが送信されると、スケジューリング部１３にスケジューラ機能を実行させる。スケジューラ機能の実行により、ＳＲを送信した無線端末２０に対して上りリンク無線リソースが割当てられる。 Also, the SR is transmitted from the wireless communication unit 11 to the control unit 12. When the SR is transmitted, the control unit 12 causes the scheduling unit 13 to execute the scheduler function. By executing the scheduler function, uplink radio resources are allocated to the radio terminal 20 that has transmitted the SR.
　上りリンク無線リソースの割当てを完了すると、スケジューリング部１３により割当てた無線リソースの割当情報であるアップリンクグラントが生成される。生成されたアップリンググラントが、無線通信部１１に送信される。 When the uplink radio resource allocation is completed, an uplink grant that is allocation information of the radio resource allocated by the scheduling unit 13 is generated. The generated uplink grant is transmitted to the wireless communication unit 11.
　無線基地局１０では、複数の無線端末２０に対してアップリンクデータ、及びダウンリンクデータの送受信を行っている。それゆえ、無線リンクの混雑、すなわち無線リソースの空き容量が新規の無線リソースの割当てに不十分となることがある。このような場合に、スケジューリング部１３では、上りリンク無線リソースの割当が出来ないことになる。 The radio base station 10 transmits / receives uplink data and downlink data to / from a plurality of radio terminals 20. Therefore, radio link congestion, that is, the free capacity of radio resources, may be insufficient for allocation of new radio resources. In such a case, the scheduling unit 13 cannot allocate uplink radio resources.
　制御部１２は、スケジューリング部１３にスケジューラ機能を実行させた場合には、割当てが完了するか否かを判別する。制御部１２は、割当てが不可の場合には、第１の時間の経過後スケジューリング部１３にスケジューラ機能を再試行させる。第１の時間は、例えば無線通信システム１で規定された処理単位時間、例えば無線フレームにおけるサブフレーム（１ｍｓ）に定められる。 The control unit 12 determines whether the assignment is completed when the scheduling unit 13 executes the scheduler function. If the allocation is impossible, the control unit 12 causes the scheduling unit 13 to retry the scheduler function after the first time has elapsed. The first time is determined, for example, as a processing unit time defined in the wireless communication system 1, for example, a subframe (1 ms) in a wireless frame.
　以後、上りリンク無線リソースの割当てが完了するか、または割当ての失敗回数が第１の回数に達するまで、制御部１２はスケジューリング部１３にスケジューラ機能を再試行させる。なお、制御部１２にはカウンタ１５が接続されており、カウンタ１５はスケジューラ機能の実行回数を検出する。 Thereafter, the control unit 12 causes the scheduling unit 13 to retry the scheduler function until the uplink radio resource allocation is completed or the number of allocation failures reaches the first number. Note that a counter 15 is connected to the control unit 12, and the counter 15 detects the number of executions of the scheduler function.
　第１の回数は、無線端末２０毎のＳＲの送信間隔Ｔｓｒに応じて変更される。第１の回数Ｎｒｔは、無線端末２０からのＳＲの送信間隔Ｔｓｒ（ｍｓ）、第１の時間Ｔｒｔ（ｍｓ）、アップリンクグラントの無線基地局１０からの送信時から無線端末２０で受信するまでにかかる時間Ｔｔｒとの間で、Ｔｓｒ＞Ｎｒｔ×Ｔｒｔ＋Ｔｔｒを満たすように定められる。 The first number is changed according to the SR transmission interval Tsr for each radio terminal 20. The first number of times Nrt is the SR transmission interval Tsr (ms) from the radio terminal 20, the first time Trt (ms), from the time of transmission from the uplink grant radio base station 10 until the radio terminal 20 receives it. The time Ttr is determined so as to satisfy Tsr> Nrt × Trt + Ttr.
　ＳＲの送信間隔Ｔｓｒに対応する第１の回数は、テーブルデータとしてＲＯＭ１４に格納されている。前述のように、ＳＲとともに送信間隔Ｔｓｒも通知されるので、ＳＲの受信時に通知された送信時間に応じた回数が制御部１２により読出される。 The first number of times corresponding to the SR transmission interval Tsr is stored in the ROM 14 as table data. As described above, since the transmission interval Tsr is notified together with the SR, the number of times corresponding to the transmission time notified when the SR is received is read out by the control unit 12.
　続いて、無線端末２０からＳＲ受信時に無線基地局１０で実行される無線リソース割当てのための処理について、図２のフローチャートを用いて説明する。なお、無線リソース割当てのための処理は、無線端末２０から送信されるＳＲを無線基地局１０が受信するときに開始する。 Subsequently, processing for radio resource allocation executed by the radio base station 10 when receiving SR from the radio terminal 20 will be described with reference to the flowchart of FIG. Note that the processing for radio resource allocation starts when the radio base station 10 receives the SR transmitted from the radio terminal 20.
　ステップＳ１００において、制御部１２は、ＳＲとともに受信した送信間隔Ｔｓｒを認識する。送信間隔Ｔｓｒの認識後、プロセスはステップＳ１０１に進む。 In step S100, the control unit 12 recognizes the transmission interval Tsr received together with the SR. After recognizing the transmission interval Tsr, the process proceeds to step S101.
　ステップＳ１０１では、制御部１２は、カウンタ１４におけるスケジューラ機能の実行回数をゼロにリセットさせる。ゼロにリセットさせると、プロセスはステップＳ１０２に進む。 In step S101, the control unit 12 resets the number of executions of the scheduler function in the counter 14 to zero. Once reset to zero, the process proceeds to step S102.
　ステップＳ１０２では、制御部１２は、ステップＳ１００において認識した時間間隔Ｔｓｒに対応する回数をＲＯＭ１４から読出し、第１の回数に設定する。第１の回数の設定後、プロセスはステップＳ１０３に進む。 In step S102, the control unit 12 reads the number of times corresponding to the time interval Tsr recognized in step S100 from the ROM 14, and sets it to the first number. After setting the first number of times, the process proceeds to step S103.
　ステップＳ１０３では、制御部１２は、スケジューリング部１３にスケジューラ機能を実行させる。スケジューラ機能の実行後、プロセスはステップＳ１０４に進む。 In step S103, the control unit 12 causes the scheduling unit 13 to execute a scheduler function. After execution of the scheduler function, the process proceeds to step S104.
　ステップＳ１０４では、制御部１２は、上りリンク無線リソースの割当てを完了したか否かを判別する。割当てが完了しなかったときには、プロセスはステップＳ１０５に進む。割当てが完了したときには、プロセスはステップＳ１０７に進む。 In step S104, the control unit 12 determines whether or not the allocation of the uplink radio resource is completed. If the assignment is not complete, the process proceeds to step S105. When the assignment is complete, the process proceeds to step S107.
　ステップＳ１０５では、制御部１２は、スケジューラ機能の実行回数に＋１をインクリメントするようにカウンタ１５を制御する。実行回数の計測後、次のステップＳ１０６において、制御部１２は、実行回数がステップＳ１０２において設定された第１の回数未満であるか否かを判別する。第１の回数未満である場合には、プロセスはステップＳ１０５に戻る。一方、第１の回数に達したときには、制御部１２は、無線リソースの割当てを断念して、割当てのための処理を終了する。 In step S105, the control unit 12 controls the counter 15 to increment the scheduler function execution count by +1. After measuring the number of executions, in the next step S106, the control unit 12 determines whether or not the number of executions is less than the first number set in step S102. If it is less than the first number, the process returns to step S105. On the other hand, when the first number of times has been reached, the control unit 12 abandons the allocation of radio resources and ends the process for allocation.
　一方、ステップＳ１０７では、制御部１２は、スケジューリング部１３に割当てた無線リソースに応じたアップリンクグラントを生成させる。さらに、次のステップＳ１０８において、制御部１２は、アップリンググラントを無線通信部１１に送信させる。アップリンクグラントの送信後、割当てのための処理を終了する。 On the other hand, in step S107, the control unit 12 generates an uplink grant according to the radio resource allocated to the scheduling unit 13. Further, in the next step S108, the control unit 12 causes the wireless communication unit 11 to transmit an uplink grant. After transmission of the uplink grant, the process for allocation is terminated.
　以上のような構成の本実施形態の無線基地局１０によれば、上述のように、無線端末２０から受信する初回のＳＲに対して、上りリンク無線リソースの割当てを複数回再試行することが可能である。したがって、無線端末２０からのＳＲの送信の無駄な繰返しを低減化させることが可能である。 According to the radio base station 10 of the present embodiment configured as described above, it is possible to retry uplink radio resource allocation a plurality of times for the first SR received from the radio terminal 20 as described above. Is possible. Therefore, useless repetition of SR transmission from the radio terminal 20 can be reduced.
　また、初回のＳＲ受信時から、上りリンク無線リソースの割当て完了までの経過時間を短縮することが可能である。経過時間の短縮化について、図３、４を用いて説明する。図３は、従来の無線基地局と無線端末間における無線リソース割当ての処理を説明するタイミングチャートである。図４は、本実施形態における無線基地局と無線端末間における無線リソース割当ての処理を説明するタイミングチャートである。 Also, it is possible to shorten the elapsed time from the first SR reception until the completion of uplink radio resource allocation. The shortening of the elapsed time will be described with reference to FIGS. FIG. 3 is a timing chart for explaining processing of radio resource allocation between a conventional radio base station and a radio terminal. FIG. 4 is a timing chart for explaining processing of radio resource allocation between the radio base station and the radio terminal in the present embodiment.
　図３に示すように、従来の無線基地局では、無線端末からの単一のＳＲ送信に対してスケジューラ機能が１回試行されていた。スケジューラ機能の施行後、無線リソースの割当てが出来なかった場合、アップリンクグラントは送信されない。それゆえ、無線端末はアップリンクグラントを受信できなかった場合に、直前のＳＲ送信から所定の時間間隔Ｔｓｒの経過時に再度のＳＲを送信する。 As shown in FIG. 3, in the conventional radio base station, the scheduler function has been tried once for a single SR transmission from the radio terminal. If the radio resource cannot be allocated after the scheduler function is implemented, the uplink grant is not transmitted. Therefore, if the radio terminal cannot receive the uplink grant, it transmits another SR when a predetermined time interval Tsr has elapsed since the previous SR transmission.
　無線基地局において無線リソースの割当てが完了するまで、ＳＲ送信及びスケジューラ機能の試行が繰返される。無線基地局において無線リソースの割当てが完了すると、アップリンクグラントが無線基地局から送信され、無線端末からのアップリンクデータの送信が開始する。それゆえ、ＳＲの送信後からアップリンクデータを送信開始するまでに、少なくとも（ＳＲ送信回数）×（ＳＲの送信間隔）の時間がかかる。 The trial of the SR transmission and the scheduler function is repeated until the allocation of radio resources is completed in the radio base station. When the allocation of radio resources is completed in the radio base station, an uplink grant is transmitted from the radio base station, and transmission of uplink data from the radio terminal is started. Therefore, it takes at least (SR transmission count) × (SR transmission interval) to start transmission of uplink data after transmission of SR.
　一方、本実施形態では、図４に示すように、無線リソースの割当てに失敗しても、再度のＳＲを受信する前からスケジューラ機能の再試行が繰返される。それゆえ、スケジューラ機能の再試行が繰返されるので、従来の無線基地局に比べて単一のＳＲによる無線リソースの割当て成功の可能性が高い。したがって、無線リソースの割当てが完了するまでにかかる時間が、従来の無線基地局より短縮化される可能性が高められる。 On the other hand, in the present embodiment, as shown in FIG. 4, even if radio resource allocation fails, retry of the scheduler function is repeated before receiving another SR. Therefore, since the retry of the scheduler function is repeated, the possibility of successful radio resource allocation by a single SR is higher than that of the conventional radio base station. Therefore, there is an increased possibility that the time taken to complete the allocation of radio resources is shortened compared to the conventional radio base station.
　また、本実施形態の無線基地局１０によれば、一度のＳＲの受信に対してスケジューラ機能の再試行回数の上限値が定められる。それゆえ、無線リソースの割当てを完了させるまでの時間を短縮化させながら無線基地局１０への極端に負荷がかかることが防止される。前述のように、スケジューラ機能を再試行することにより無線リソースの割当てを完了させるまでにかかる時間を短縮化することが可能である。一方で、再試行回数を増やすほど無線基地局１０における負荷が増大する。そこで、本実施形態のように上限値を定めることにより、無線基地局１０の負荷の極端な増加を防止することが可能である。 In addition, according to the radio base station 10 of the present embodiment, the upper limit value of the retry count of the scheduler function is determined for one SR reception. Therefore, it is possible to prevent an excessive load from being applied to the radio base station 10 while shortening the time until the radio resource allocation is completed. As described above, it is possible to shorten the time taken to complete the allocation of radio resources by retrying the scheduler function. On the other hand, the load on the radio base station 10 increases as the number of retries increases. Therefore, it is possible to prevent an extreme increase in the load on the radio base station 10 by setting an upper limit value as in this embodiment.
　また、本実施形態の無線基地局によれば、再試行回数の上限値である第１の回数は、無線端末２０からのＳＲの送信間隔Ｔｓｒに応じて適切に変えられる。例えば、第１の回数が固定値であって送信間隔Ｔｓｒが相対的に短い場合には、二度目以降のＳＲが受信された場合であっても、初回のＳＲに応じたスケジューラ機能の再試行が繰返されることが有り得る。しかし、本実施形態によれば、再度のＳＲ受信の前にはスケジューラ機能の再試行を終了させることが可能である。 Also, according to the radio base station of the present embodiment, the first number that is the upper limit value of the number of retries can be appropriately changed according to the SR transmission interval Tsr from the radio terminal 20. For example, when the first number is a fixed value and the transmission interval Tsr is relatively short, the scheduler function is retried according to the first SR even if the second and subsequent SRs are received. May be repeated. However, according to the present embodiment, it is possible to terminate the retry of the scheduler function before receiving another SR.
　本発明を諸図面や実施例に基づき説明してきたが、当業者であれば本開示に基づき種々の変形や修正を行うことが容易であることに注意されたい。従って、これらの変形や修正は本発明の範囲に含まれることに留意されたい。 Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.
　例えば、第１の時間は、無線通信システム１で規定された処理単位時間に定められる構成であるが、処理単位時間に限定されない。無線端末２０によるＳＲの最短送信間隔より短い時間であれば、本実施形態と同様の効果を得ることが可能である。 For example, the first time is configured to be the processing unit time defined in the wireless communication system 1, but is not limited to the processing unit time. If the time is shorter than the shortest SR transmission interval by the wireless terminal 20, the same effect as in the present embodiment can be obtained.
　１　無線通信システム
　１０　無線基地局
　１１　無線通信部
　１２　制御部
　１３　スケジューリング部
　１４　ＲＯＭ
　１５　カウンタ
　２０　無線端末 DESCRIPTION OF SYMBOLS 1 Wireless communication system 10 Wireless base station 11 Wireless communication part 12 Control part 13 Scheduling part 14 ROM
15 counter 20 wireless terminal

Claims (6)

  1. 　無線端末と通信する無線基地局であって、
    　前記無線端末に対して上りリンク無線リソースの割当てをするスケジューラ機能を実行するスケジューリング部と、
    　前記無線端末から送信される無線リソース割当て要求を受信する場合に前記スケジューリング部に前記スケジューラ機能を実行させ、前記スケジューリング部が前記上りリンク無線リソースの割当てを出来なかった場合に前記スケジューラ機能を再試行させる制御部とを備える
    　ことを特徴とする無線基地局。     A wireless base station that communicates with a wireless terminal,
    A scheduling unit that executes a scheduler function for allocating uplink radio resources to the radio terminal;
    Causing the scheduling unit to execute the scheduler function when receiving a radio resource allocation request transmitted from the radio terminal, and retrying the scheduler function when the scheduling unit fails to allocate the uplink radio resource A wireless base station.
  2. 　請求項１に記載の無線基地局であって、単一の前記無線リソース割当て要求に対する前記スケジューラ機能の再試行の試行回数が第１の回数に定められることを特徴とする無線基地局。 2. The radio base station according to claim 1, wherein the number of times of retry of the scheduler function for a single radio resource allocation request is set to a first number.
  3. 　請求項１に記載の無線基地局であって、前記第１の回数は前記無線端末の前記無線リソース割当て要求の送信間隔に応じて設定されることを特徴とする無線基地局。 The radio base station according to claim 1, wherein the first number of times is set according to a transmission interval of the radio resource allocation request of the radio terminal.
  4. 　請求項１に記載の無線基地局であって、前記スケジューラ機能の再試行は、前記無線基地局を含む無線通信システムにおいて定められる最短の伝送時間間隔で行われることを特徴とする無線基地局。 2. The radio base station according to claim 1, wherein the scheduler function is retried at a shortest transmission time interval determined in a radio communication system including the radio base station.
  5. 　無線リソース割当て要求を送信する無線端末と、
    　前記無線端末に対して上りリンク無線リソースの割当てをするスケジューラ機能を実行するスケジューリング部と、前記無線端末から送信される前記無線リソース割当て要求を受信する場合に前記スケジューリング部に前記スケジューラ機能を実行させ且つ前記スケジューリング部が前記上りリンク無線リソースの割当てを出来なかった場合に前記スケジューラ機能を再試行させる制御部とを有する無線基地局とを備える
    　ことを特徴とする無線通信システム。     A wireless terminal that transmits a wireless resource allocation request;
    A scheduling unit that executes a scheduler function for allocating uplink radio resources to the radio terminal, and when receiving the radio resource allocation request transmitted from the radio terminal, causes the scheduling unit to execute the scheduler function And a radio base station having a control unit for retrying the scheduler function when the scheduling unit cannot allocate the uplink radio resource.
  6. 　無線リソース割当て要求を送信する送信ステップと、
    　前記無線リソース割当て要求を受信する場合に上りリンク無線リソースの割当てをするスケジューラ機能を実行する実行ステップと、
    　前記実行ステップにおいて、前記上りリンク無線リソースの割当てをできなかった場合に前記スケジューラ機能を再試行する再試行ステップとを備える
    　ことを特徴とする無線通信方法。     A transmission step of transmitting a radio resource allocation request;
    An execution step of executing a scheduler function of allocating uplink radio resources when receiving the radio resource allocation request;
    A retrying step of retrying the scheduler function when the uplink radio resource could not be allocated in the executing step.
PCT/JP2012/004950 2011-08-05 2012-08-03 Radio base station, wireless communication system, and wireless communication method WO2013021603A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09215050A (en) * 1996-02-06 1997-08-15 Nippon Telegr & Teleph Corp <Ntt> Radio channel allocating method
WO2008050467A1 (en) * 2006-10-27 2008-05-02 Mitsubishi Electric Corporation Data communication method, communication system and mobile terminal

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4360949B2 (en) * 2004-03-18 2009-11-11 富士通株式会社 Mobile communication control method and radio network control apparatus
JP4486483B2 (en) * 2004-11-26 2010-06-23 古野電気株式会社 TDMA communication device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09215050A (en) * 1996-02-06 1997-08-15 Nippon Telegr & Teleph Corp <Ntt> Radio channel allocating method
WO2008050467A1 (en) * 2006-10-27 2008-05-02 Mitsubishi Electric Corporation Data communication method, communication system and mobile terminal

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