JP5770566B2 - Base station and transmission timing adjustment method - Google Patents

Base station and transmission timing adjustment method Download PDF

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JP5770566B2
JP5770566B2 JP2011183047A JP2011183047A JP5770566B2 JP 5770566 B2 JP5770566 B2 JP 5770566B2 JP 2011183047 A JP2011183047 A JP 2011183047A JP 2011183047 A JP2011183047 A JP 2011183047A JP 5770566 B2 JP5770566 B2 JP 5770566B2
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timing advance
mobile station
transmission
timing
base station
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JP2013046257A (en
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徹 内野
徹 内野
アニール ウメシュ
アニール ウメシュ
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NTT Docomo Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/004Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

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Description

本発明は、上りリンクにおける移動局からの送信タイミングのずれを検出し、Timing Advanceを当該移動局に送信することによって、当該送信タイミングを調整する基地局及び送信タイミング調整方法に関する。   The present invention relates to a base station and a transmission timing adjustment method for adjusting a transmission timing by detecting a transmission timing shift from a mobile station in an uplink and transmitting Timing Advance to the 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)が基地局(eNB)に向けて送信する上りリンク(UL)の送信タイミングのずれを補正するため、基地局が移動局に対してTiming Advance(TA)を送信することが規定されている(例えば、非特許文献1)。   In Long Term Evolution (LTE), which is standardized by the 3rd Generation Partnership Project (3GPP), to correct the transmission timing deviation of the uplink (UL) that the mobile station (UE) transmits to the base station (eNB) It is defined that the base station transmits Timing Advance (TA) to the mobile station (for example, Non-Patent Document 1).

Timing Advanceは、(1)Random Access手順において規定されるRandom Access (RA) Response、或いは(2)Timing Advance MAC Control Elementによって基地局から移動局に送信される。   Timing Advance is transmitted from the base station to the mobile station by (1) Random Access (RA) Response defined in the Random Access procedure or (2) Timing Advance MAC Control Element.

3GPP TS 36.300 V10.3.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 10)、2011年3月3GPP TS 36.300 V10.3.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 10 ), March 2011

しかしながら、上述した従来のTiming Advanceの送信方法には、次のような問題があった。すなわち、上述した(2)によるTiming Advanceの送信方法では、Timing Advance MAC Control Elementを生成した後にRandom Access手順が起動されると、起動されたRandom Access手順によって上りリンクの送信タイミングがTiming Advanceによって調整された後に、Timing Advance MAC Control Elementによって送信される古いTiming Advanceが基地局から移動局に送信されてしまう問題があった。   However, the conventional Timing Advance transmission method described above has the following problems. That is, in the Timing Advance transmission method according to (2) described above, when the Random Access procedure is activated after the Timing Advance MAC Control Element is generated, the uplink transmission timing is adjusted by Timing Advance according to the activated Random Access procedure. After that, the old Timing Advance transmitted by the Timing Advance MAC Control Element is transmitted from the base station to the mobile station.

このため、Random Access手順によって上りリンクの送信タイミングがTiming Advanceによって調整された後に、移動局への送信が保留されていた古いTiming Advanceによって上りリンクの送信タイミングがずれる可能性がある。   For this reason, after the uplink transmission timing is adjusted by Timing Advance according to the Random Access procedure, there is a possibility that the uplink transmission timing is shifted due to the old Timing Advance in which transmission to the mobile station is suspended.

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、移動局への送信が保留されていた古いTiming Advanceによって上りリンクの送信タイミングがずれることを防止し得る基地局及び送信タイミング調整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 a base station and a transmission timing that can prevent uplink transmission timing from being shifted due to old Timing Advance for which transmission to a mobile station has been suspended. The purpose is to provide an adjustment method.

本発明の第1の特徴は、上りリンクにおける移動局(例えば、移動局200A)からの送信タイミングのずれを検出し、Timing Advanceを前記移動局に送信することによって、前記送信タイミングを調整する基地局(基地局100)であって、前記上りリンクの同期外れを検出する同期外れ検出部(UL同期外れ検出部103)と、前記同期外れ検出部によって前記同期外れが検出された場合、Timing Advance MAC Control ElementによるTiming Advanceの送信を中断するTA送信制御部(TA送信制御部107)と、Random Access手順に従ったTiming Advanceを前記移動局に送信するRA手順実行部(RA手順実行部105)とを備え、前記TA送信制御部は、前記Timing Advance MAC Control ElementによるTiming Advanceの送信を決定した後に、前記RA手順実行部が前記Random Access手順によるTiming Advanceを前記移動局に送信した場合、前記Timing Advance MAC Control ElementによるTiming Advanceを破棄することを要旨とする。   A first feature of the present invention is a base that adjusts the transmission timing by detecting a shift in transmission timing from a mobile station (for example, mobile station 200A) in the uplink and transmitting Timing Advance to the mobile station. When the out-of-synchronization is detected by the out-of-synchronization detection unit (UL out-of-synchronization detection unit 103) that detects the out-of-synchronization of the uplink, TA transmission control unit (TA transmission control unit 107) that interrupts transmission of Timing Advance by MAC Control Element, and RA procedure execution unit (RA procedure execution unit 105) that transmits Timing Advance according to the Random Access procedure to the mobile station The TA transmission control unit, after determining the Timing Advance transmission by the Timing Advance MAC Control Element, the RA procedure execution unit transmitted Timing Advance by the Random Access procedure to the mobile station If, and summarized in that discarding the Timing Advance by the Timing Advance MAC Control Element.

本発明の第2の特徴は、上りリンクにおける移動局からの送信タイミングのずれを検出し、Timing Advanceを前記移動局に送信することによって、前記送信タイミングを調整する通信装置による送信タイミング調整方法であって、前記上りリンクにおける同期外れを検出するステップと、前記同期外れが検出された場合、Timing Advance MAC Control ElementによるTiming Advanceの送信を中断するステップと、Random Access手順に従ったTiming Advanceを前記移動局に送信するステップと、前記Timing Advance MAC Control ElementによるTiming Advanceの送信を決定した後に、前記Random Access手順によるTiming Advanceを前記移動局に送信した場合、前記Timing Advance MAC Control ElementによるTiming Advanceを破棄するステップとを有することを要旨とする。   A second feature of the present invention is a transmission timing adjustment method by a communication device that adjusts the transmission timing by detecting a shift in transmission timing from the mobile station in the uplink and transmitting Timing Advance to the mobile station. A step of detecting out-of-synchronization in the uplink, a step of interrupting Timing Advance transmission by the Timing Advance MAC Control Element when the out-of-synchronization is detected, and Timing Advance according to the Random Access procedure. After transmitting the Timing Advance by the Random Access procedure to the mobile station after determining the transmission of the Timing Advance by the Timing Advance MAC Control Element and the step of transmitting to the mobile station, the Timing Advance by the Timing Advance MAC Control Element And a discarding step.

本発明の特徴によれば、移動局への送信が保留されていた古いTiming Advanceによって上りリンクの送信タイミングがずれることを防止し得る基地局及び送信タイミング調整方法を提供することができる。   According to the characteristics of the present invention, it is possible to provide a base station and a transmission timing adjustment method that can prevent uplink transmission timing from being shifted due to old Timing Advance in which transmission to a mobile station is suspended.

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。1 is an overall schematic configuration diagram of a wireless communication system according to an embodiment of the present invention. 本発明の実施形態に係る基地局100の機能ブロック構成図である。FIG. 3 is a functional block configuration diagram of a base station 100 according to the embodiment of the present invention. 本発明の実施形態に係る移動局200Aの機能ブロック構成図である。FIG. 3 is a functional block configuration diagram of a mobile station 200A according to the embodiment of the present invention. 本発明の実施形態に係る基地局100(eNB)と移動局200A(UE)との間における通信シーケンスを示す図である。It is a figure which shows the communication sequence between the base station 100 (eNB) and the mobile station 200A (UE) which concern on embodiment of this invention. 従来の基地局と移動局との間における通信シーケンスを示す図である。It is a figure which shows the communication sequence between the conventional base station and a mobile station. 本発明の実施形態に係る基地局100におけるTiming Advanceの制御動作フローを示す図である。It is a figure which shows the control operation | movement flow of Timing Advance in the base station 100 which concerns on embodiment of this 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。   Accordingly, specific dimensions and the like should be determined in consideration of the following description. 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100(eNB)及び移動局200A, 200B(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, a base station 100 (eNB), and mobile stations 200A and 200B (UE). Including.

基地局100は、コアネットワーク50に接続されている。基地局100は、セルC1を形成し、移動局200A及び200B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100は、上りリンクにおける移動局200A(または移動局200B、以下同)から送信される上りリンク(具体的にはフレーム)の送信タイミングのずれを検出し、Timing Advanceを移動局200Aに送信することによって、当該送信タイミングを調整するように構成されている。   Base station 100 is connected to core network 50. Base station 100 forms cell C1 and performs radio communication with mobile stations 200A and 200B according to the LTE scheme. In particular, in this embodiment, the base station 100 detects a shift in transmission timing of an uplink (specifically, a frame) transmitted from the mobile station 200A (or mobile station 200B, hereinafter the same) in the uplink, and Timing The transmission timing is adjusted by transmitting Advance to the mobile station 200A.

移動局200Aは、基地局100から送信されたTiming Advanceに基づいて基地局100に送信する上りリンクの送信タイミングを調整する。このような基地局100及び移動局200Aの動作によって、上りリンクの同期が維持される。   The mobile station 200A adjusts the uplink transmission timing to be transmitted to the base station 100 based on the Timing Advance transmitted from the base station 100. Uplink synchronization is maintained by such operations of the base station 100 and the mobile station 200A.

(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。図2は、基地局100の機能ブロック構成図である。図3は、移動局200A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. FIG. 2 is a functional block configuration diagram of the base station 100. FIG. 3 is a functional block configuration diagram of the mobile station 200A.

(2.1)基地局100
図2に示すように、基地局100は、無線通信部101、UL同期外れ検出部103、RA手順実行部105及びTA送信制御部107を備える。
(2.1) Base station 100
As shown in FIG. 2, the base station 100 includes a radio communication unit 101, a UL synchronization loss detection unit 103, an RA procedure execution unit 105, and a TA transmission control unit 107.

無線通信部101は、移動局200A(200B)とLTE方式に従った無線通信を実行する。   The radio communication unit 101 performs radio communication with the mobile station 200A (200B) according to the LTE scheme.

UL同期外れ検出部103は、上りリンク(UL)の同期外れを検出する。本実施形態において、UL同期外れ検出部103は、同期外れ検出部を構成する。具体的には、UL同期外れ検出部103は、移動局200Aから送信される上り物理チャネル(Sounding RSやPUCCH)の品質を監視する。UL同期外れ検出部103は、移動局200Aから送信される上り物理チャネルの品質が所定時間(或いは、所定の観測回数)に渡って閾値を下回ると、同期外れを検出する。   The UL out-of-synchronization detection unit 103 detects uplink (UL) out-of-synchronization. In the present embodiment, the UL out-of-sync detection unit 103 constitutes an out-of-sync detection unit. Specifically, the UL synchronization detection unit 103 monitors the quality of the uplink physical channel (Sounding RS or PUCCH) transmitted from the mobile station 200A. The UL out-of-synchronization detection unit 103 detects out-of-synchronization when the quality of the uplink physical channel transmitted from the mobile station 200A falls below a threshold for a predetermined time (or a predetermined number of observations).

RA手順実行部105は、LTE方式において規定されるRandom Access手順を実行する。RA手順実行部105は、下り制御チャネルにより移動局200Aに対してRA手順の実行を指示する。また、RA手順実行部105は当該Random Access手順の中で、移動局200Aが送信するフレームの送信タイミングの調整に用いられるTiming Advanceを含むRA Responseを移動局200Aに送信する。すなわち、RA手順実行部105は、Random Access手順に従ったTiming Advanceを移動局200Aに送信する。   The RA procedure execution unit 105 executes a Random Access procedure defined in the LTE scheme. The RA procedure execution unit 105 instructs the mobile station 200A to execute the RA procedure through the downlink control channel. In addition, the RA procedure execution unit 105 transmits RA Response including Timing Advance used for adjusting the transmission timing of the frame transmitted by the mobile station 200A to the mobile station 200A in the Random Access procedure. That is, the RA procedure execution unit 105 transmits Timing Advance according to the Random Access procedure to the mobile station 200A.

なお、MAC層では、移動局200Aの以下の状態を契機としてRandom Access手順が実行される。   In the MAC layer, the Random Access procedure is executed in response to the following state of the mobile station 200A.

・Initial Access時
・再接続時
・ハンドオーバ時
・下りリンク(DL) data resuming(UL同期外れ)
・上りリンク(UL) data resuming(Scheduling Request送信のためのUL個別リソースが存在しない場合)
TA送信制御部107は、Timing Advance(TA)の移動局200Aへの送信を制御する。具体的には、TA送信制御部107は、移動局200Aが上りリンクにおいて送信するフレームのタイミングのずれを検出し、移動局200Aに向けてTiming Advanceを送信する。
-Initial Access-Reconnection-Handover-Downlink (DL) data resuming (UL out of synchronization)
-Uplink (UL) data resuming (when there is no UL individual resource for sending a scheduling request)
TA transmission control section 107 controls transmission of Timing Advance (TA) to mobile station 200A. Specifically, the TA transmission control unit 107 detects a shift in timing of frames transmitted by the mobile station 200A in the uplink, and transmits Timing Advance toward the mobile station 200A.

より具体的には、TA送信制御部107は、UL同期外れ検出部103によって当該上りリンクの同期外れが検出された場合(或いは、UL同期外れ検出部103からRA手順実行部105にRandom Access手順が指示された場合)、Timing Advance MAC Control ElementによるTiming Advanceの送信を中断する。   More specifically, the TA transmission control unit 107, when the UL out-of-sync detection unit 103 detects the uplink out-of-synchronization (or the UL out-of-synchronization detection unit 103 sends the RA procedure execution unit 105 to the Random Access procedure ), The Timing Advance MAC Control Element stops sending Timing Advance.

TA送信制御部107は、Timing Advance MAC Control ElementによるTiming Advanceの送信を決定した後に、別のTiming Advanceが送信された場合には、当該Timing Advanceを移動局200Aに送信せずに破棄する。具体的には、TA送信制御部107は、RA手順実行部105がRandom Access手順によるTiming Advanceを移動局200Aに送信した場合、Timing Advance MAC Control ElementによるTiming Advanceを破棄する。なお、TA送信制御部107は、RA手順実行部105がRandom Access手順を指示することを決定した場合、或いは、RA手順実行部105が移動局200Aに対してRandom Access手順の起動を下り制御チャネルを介して指示した場合、Timing Advance MAC Control ElementによるTiming Advanceを破棄してもよい。   TA transmission control part 107 will discard the said Timing Advance, without transmitting to the mobile station 200A, when another Timing Advance is transmitted after determining the transmission of Timing Advance by Timing Advance MAC Control Element. Specifically, when the RA procedure execution unit 105 transmits Timing Advance based on the Random Access procedure to the mobile station 200A, the TA transmission control unit 107 discards Timing Advance based on the Timing Advance MAC Control Element. The TA transmission control unit 107 determines that the RA procedure execution unit 105 instructs the Random Access procedure, or the RA procedure execution unit 105 activates the Random Access procedure to the mobile station 200A in the downlink control channel. When instructing via, Timing Advance by Timing Advance MAC Control Element may be discarded.

ただし、TA送信制御部107は、Timing Advance MAC Control ElementによるTiming AdvanceがハイブリッドARQによる再送対象のTiming Advanceである場合、当該Timing Advance MAC Control ElementによるTiming Advanceを破棄せずに送信することもできる。   However, when the Timing Advance by the Timing Advance MAC Control Element is the Timing Advance to be retransmitted by the hybrid ARQ, the TA transmission control unit 107 can also transmit without discarding the Timing Advance by the Timing Advance MAC Control Element.

なお、TA送信制御部107は、RA手順実行部105がRandom Access手順において、Timing Advanceを含むRA Responseを移動局200Aに送信した場合、Timing Advance MAC Control ElementによるTiming Advanceを破棄してもよい。   Note that the TA transmission control unit 107 may discard the Timing Advance by the Timing Advance MAC Control Element when the RA procedure execution unit 105 transmits an RA Response including Timing Advance to the mobile station 200A in the Random Access procedure.

また、TA送信制御部107は、Timing Advance MAC Control ElementによるTiming Advanceと異なるTiming Advanceを含むMAC-PDU(Protocol Data Unit)が生成された場合、Timing Advance MAC Control ElementによるTiming Advanceを破棄してもよい。   Moreover, even if TA transmission control part 107 discards Timing Advance by Timing Advance MAC Control Element, when MAC-PDU (Protocol Data Unit) containing Timing Advance different from Timing Advance by Timing Advance MAC Control Element is generated, Good.

(2.2)移動局200A
図3に示すように、移動局200Aは、無線通信部201、TA受信部203、タイミング制御部205及びRA手順実行部207を備える。
(2.2) Mobile station 200A
As illustrated in FIG. 3, the mobile station 200A includes a wireless communication unit 201, a TA reception unit 203, a timing control unit 205, and an RA procedure execution unit 207.

無線通信部201は、基地局100とLTE方式に従った無線通信を実行する。   The wireless communication unit 201 performs wireless communication with the base station 100 according to the LTE scheme.

TA受信部203は、基地局100によって送信されたTiming Advance(TA)を受信する。   TA receiving section 203 receives Timing Advance (TA) transmitted by base station 100.

タイミング制御部205は、TA受信部203によって受信されたTiming Advanceに基づいて、無線通信部201が上りリンクにおいて送信するフレームの送信タイミングを調整する。具体的には、タイミング制御部205は、当該Timing Advanceに基づいて無線通信部201が送信するフレームの送信タイミングを早めたり、遅らせたりする。   The timing control unit 205 adjusts the transmission timing of the frame that the wireless communication unit 201 transmits in the uplink based on the Timing Advance received by the TA receiving unit 203. Specifically, the timing control unit 205 advances or delays the transmission timing of the frame transmitted by the wireless communication unit 201 based on the Timing Advance.

RA手順実行部207は、LTE方式において規定されるRandom Access手順を実行する。   The RA procedure execution unit 207 executes a Random Access procedure defined in the LTE scheme.

(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100によるTiming Advanceを用いた移動局200Aにおける上りリンクの送信タイミングの調整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 uplink transmission timing adjustment operation in mobile station 200A using Timing Advance by base station 100 will be described.

(3.1)通信シーケンス
図4は、本実施形態に係る基地局100(eNB)と移動局200A(UE)との間における通信シーケンスを示す。また、図5は、従来の基地局と移動局との間における通信シーケンスを示す図である。
(3.1) Communication Sequence FIG. 4 shows a communication sequence between the base station 100 (eNB) and the mobile station 200A (UE) according to this embodiment. FIG. 5 is a diagram showing a communication sequence between a conventional base station and a mobile station.

図4に示すように、基地局100は、移動局200Aが上りリンクにおいて送信するフレームのタイミングずれを検出し、Timing Advance(TA)を生成する(S10)。具体的には、基地局100は、Timing Advance MAC Control ElementによるTiming Advanceを生成する。   As illustrated in FIG. 4, the base station 100 detects a timing difference between frames transmitted by the mobile station 200A in the uplink, and generates Timing Advance (TA) (S10). Specifically, the base station 100 generates Timing Advance by Timing Advance MAC Control Element.

このように、Timing Advance MAC Control ElementによるTiming Advanceが生成された後に、基地局100は、上りリンクの同期外れを検出する(S20)。基地局100は、当該同期外れの検出に伴って、Random Access手順を起動し、当該Random Access手順を実行する(S30)。基地局100は、当該Random Access手順を実行することによって、上りリンクの同期確立を要求するSync-Request(下り制御チャネル:PDCCH)を移動局200Aに送信する。   Thus, after the Timing Advance is generated by the Timing Advance MAC Control Element, the base station 100 detects uplink synchronization loss (S20). The base station 100 activates the Random Access procedure with the detection of the loss of synchronization, and executes the Random Access procedure (S30). The base station 100 transmits a Sync-Request (downlink control channel: PDCCH) requesting establishment of uplink synchronization to the mobile station 200A by executing the Random Access procedure.

移動局200Aは、基地局100から送信されたSync-Request(下り制御チャネル:PDCCH)に基づいて、RA preambleを基地局100に送信する(S40)。   Based on the Sync-Request (downlink control channel: PDCCH) transmitted from the base station 100, the mobile station 200A transmits RA preamble to the base station 100 (S40).

基地局100は、移動局200Aから送信されたRA preambleに基づいて、Timing Advanceを含むRA Responseを移動局200Aに送信する(S50)。基地局100は、RA Responseを送信した場合、ステップS10において生成した古いTiming Advanceを破棄する。   Base station 100 transmits RA Response including Timing Advance to mobile station 200A based on the RA preamble transmitted from mobile station 200A (S50). When transmitting the RA Response, the base station 100 discards the old Timing Advance generated in Step S10.

移動局200Aは、基地局100から送信されたRA Responseに基づいて、上りリンクの送信タイミングを調整することによって上りリンクの同期状態を確立(S60)し、同期状態を確立したことを示すMsg3を基地局100に送信する(S70)。   The mobile station 200A establishes the uplink synchronization state by adjusting the uplink transmission timing based on the RA response transmitted from the base station 100 (S60), and sets Msg3 indicating that the synchronization state is established. Transmit to the base station 100 (S70).

基地局100は、移動局200Aから送信されたMsg3に基づいて、上りリンクの同期状態が確立したと見なす(S80)。   The base station 100 considers that the uplink synchronization state has been established based on Msg3 transmitted from the mobile station 200A (S80).

一方、図5に示すように、従来の基地局と移動局との場合、基地局がTiming Advanceを含むRA Responseを移動局200Aに送信(S50A)した場合でも、ステップS10において生成した古いTiming Advanceは破棄されない。このため、基地局100は、移動局200Aから送信されたMsg3に基づいて上りリンクの同期状態が確立したと見なした場合、当該古いTiming Advanceを移動局200Aに送信してしまう(S90)。移動局200Aは、当該古いTiming Advanceに基づいて上りリンクの送信タイミングを調整するため、結果的に上りリンクの送信タイミングがずれてしまう。   On the other hand, as shown in FIG. 5, in the case of a conventional base station and mobile station, even when the base station transmits an RA Response including Timing Advance to the mobile station 200A (S50A), the old Timing Advance generated in step S10 Is not destroyed. For this reason, when the base station 100 considers that the uplink synchronization state has been established based on Msg3 transmitted from the mobile station 200A, the base station 100 transmits the old Timing Advance to the mobile station 200A (S90). Since the mobile station 200A adjusts the uplink transmission timing based on the old Timing Advance, the uplink transmission timing is shifted as a result.

本実施形態では、上述したように、RA Responseを送信した場合、ステップS10において生成した古いTiming Advanceが破棄されるため、このような問題が解消されている。   In the present embodiment, as described above, when the RA Response is transmitted, the old Timing Advance generated in Step S10 is discarded, and thus such a problem is solved.

(3.2)基地局100の動作フロー
次に、図6を参照して基地局100の動作フローを示す。具体的には、図6は、基地局100におけるTiming Advanceの制御動作フローを示す。
(3.2) Operation Flow of Base Station 100 Next, an operation flow of the base station 100 is shown with reference to FIG. Specifically, FIG. 6 shows a control operation flow of Timing Advance in the base station 100.

図6に示すように、基地局100は、Timing Advance(ここでは、TA1)を生成する(S110)。TA1は、上りリンクの送信タイミングずれの検出に伴って生成される。このような動作は、図4に示したステップS10と対応する。   As illustrated in FIG. 6, the base station 100 generates Timing Advance (here, TA1) (S110). TA1 is generated along with detection of an uplink transmission timing shift. Such an operation corresponds to step S10 shown in FIG.

基地局100は、TA1と異なる別のTiming Advance(ここでは、TA2)を生成する必要が生じたか否かを判定する(S120)。TA2は、上りリンクの同期外れの検出に伴って生成される。このような動作は、図4に示したステップS20と対応する。   The base station 100 determines whether or not it is necessary to generate another Timing Advance (here, TA2) different from TA1 (S120). TA2 is generated along with detection of uplink out of synchronization. Such an operation corresponds to step S20 shown in FIG.

TA2を生成する必要が生じた場合、基地局100は、TA1を破棄する(S130)。具体的には、基地局100は、Random Access手順におけるRA Responseを送信した場合、TA1を破棄する。基地局100は、TA2のみを移動局200Aに送信する(S140)。   When it becomes necessary to generate TA2, base station 100 discards TA1 (S130). Specifically, base station 100 discards TA1 when transmitting RA Response in the Random Access procedure. Base station 100 transmits only TA2 to mobile station 200A (S140).

一方、TA2を生成する必要が生じていない場合、基地局100は、TA1を移動局200Aに送信する(S150)。   On the other hand, if it is not necessary to generate TA2, base station 100 transmits TA1 to mobile station 200A (S150).

(4)作用・効果
本実施形態に係る基地局100によれば、TA送信制御部107は、Timing Advance MAC Control ElementによるTiming Advanceの送信を決定した後に、RA手順実行部105がRandom Access手順によるTiming Advanceを移動局200Aに送信した場合、当該Timing Advance MAC Control ElementによるTiming Advanceを破棄する。このため、移動局200Aへの送信が保留されていた古いTiming Advanceによって上りリンクの送信タイミングがずれることを防止し得る。
(4) Operation and Effect According to the base station 100 according to the present embodiment, the TA transmission control unit 107 determines that the Timing Advance MAC Control Element is used to transmit Timing Advance, and then the RA procedure execution unit 105 performs the Random Access procedure. When the Timing Advance is transmitted to the mobile station 200A, the Timing Advance by the Timing Advance MAC Control Element is discarded. For this reason, it is possible to prevent the uplink transmission timing from being shifted due to the old Timing Advance in which transmission to the mobile station 200A has been suspended.

また、本実施形態では、TA送信制御部107は、RA手順実行部105がRandom Access手順によるRA Responseを移動局200Aに送信した場合(或いは、RA手順実行部105がRandom Access手順を指示することを決定した場合、或いは、RA手順実行部105が移動局200Aに対してRandom Access手順の起動を指示する下り制御チャネルを送信した場合)、Timing Advance MAC Control ElementによるTiming Advanceを破棄したり、Timing Advance MAC Control ElementによるTiming Advanceと異なるTiming Advanceを含むMAC-PDUが生成された場合、当該Timing Advance MAC Control ElementによるTiming Advanceを破棄したりすることができる。このため、新たなTiming Advanceが生成された場合には、移動局200Aへの送信が保留されていた古いTiming Advanceが移動局200Aに送信されることによって上りリンクの送信タイミングがずれることを確実に防止できる。   Further, in the present embodiment, the TA transmission control unit 107, when the RA procedure execution unit 105 transmits an RA Response based on the Random Access procedure to the mobile station 200A (or the RA procedure execution unit 105 instructs the Random Access procedure) Or when the RA procedure execution unit 105 transmits a downlink control channel instructing the mobile station 200A to start the Random Access procedure), discarding the Timing Advance by the Timing Advance MAC Control Element, or Timing When MAC-PDU including Timing Advance different from Timing Advance by Advance MAC Control Element is generated, Timing Advance by the Timing Advance MAC Control Element can be discarded. For this reason, when a new Timing Advance is generated, it is ensured that the transmission timing of the uplink is shifted by transmitting the old Timing Advance that was suspended to the mobile station 200A to the mobile station 200A. Can be prevented.

本実施形態では、Timing Advance MAC Control ElementによるTiming AdvanceがハイブリッドARQによる再送対象のTiming Advanceである場合、当該Timing Advance MAC Control ElementによるTiming Advanceは破棄されずに移動局200Aに送信されることもできる。   In this embodiment, when Timing Advance by Timing Advance MAC Control Element is Timing Advance to be retransmitted by hybrid ARQ, Timing Advance by the Timing Advance MAC Control Element can be transmitted to mobile station 200A without being discarded. .

(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.

例えば、上述した本発明の実施形態では、Timing AdvanceがハイブリッドARQによる再送対象のTiming Advanceである場合、当該Timing Advance MAC Control ElementによるTiming Advanceは破棄されずに移動局200Aに送信されていたが、このような処理は必須ではない。当該Timing Advanceが破棄されたとしても、新たなTiming Advanceによって上りリンクの送信タイミングは調整可能である。   For example, in the embodiment of the present invention described above, when Timing Advance is a Timing Advance to be retransmitted by hybrid ARQ, Timing Advance by the Timing Advance MAC Control Element was transmitted to the mobile station 200A without being discarded. Such processing is not essential. Even if the Timing Advance is discarded, the uplink transmission timing can be adjusted by the new Timing Advance.

上述した実施形態では、基地局100がTiming Advanceの送信制御を実行していたが、基地局100以外の通信装置、例えば、コアネットワーク50に接続されているMME(Mobility Management Entity)が当該制御を実行してもよい。   In the above-described embodiment, the base station 100 executes Timing Advance transmission control, but a communication device other than the base station 100, for example, an MME (Mobility Management Entity) connected to the core network 50 performs the control. May be executed.

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特許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。   As described above, the present invention naturally 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 scope of claims reasonable from the above description.

50…コアネットワーク
100…基地局
101…無線通信部
103…UL同期外れ検出部
105…RA手順実行部
107…TA送信制御部
200A, 200B…移動局
201…無線通信部
203…TA受信部
205…タイミング制御部
207…RA手順実行部
C1…セル
50 ... Core network
100 ... Base station
101 ... Wireless communication part
103… UL out of sync detector
105… RA procedure execution part
107… TA transmission controller
200A, 200B ... Mobile station
201 ... Wireless communication unit
203 ... TA receiver
205 ... Timing control section
207 ... RA procedure execution part
C1 ... cell

Claims (5)

上りリンクにおける移動局からの送信タイミングのずれを検出し、Timing Advanceを前記移動局に送信することによって、前記送信タイミングを調整する基地局であって、
前記上りリンクの同期外れを検出する同期外れ検出部と、
前記同期外れ検出部によって前記同期外れが検出された場合、Timing Advance MAC Control ElementによるTiming Advanceの送信を中断するTA送信制御部と、
Random Access手順に従ったTiming Advanceを前記移動局に送信するRA手順実行部と
を備え、
前記TA送信制御部は、前記Timing Advance MAC Control ElementによるTiming Advanceの送信を決定した後に、前記RA手順実行部が前記Random Access手順によるTiming Advanceを前記移動局に送信した場合、前記Timing Advance MAC Control ElementによるTiming Advanceを破棄する基地局。
A base station that detects a transmission timing shift from a mobile station in the uplink and adjusts the transmission timing by transmitting Timing Advance to the mobile station,
An out-of-synchronization detection unit for detecting out-of-synchronization in the uplink; and
When the loss of synchronization is detected by the loss of synchronization detection unit, a TA transmission control unit that interrupts the transmission of Timing Advance by the Timing Advance MAC Control Element, and
An RA procedure execution unit that transmits Timing Advance according to the Random Access procedure to the mobile station;
The TA transmission control unit, after determining the Timing Advance transmission by the Timing Advance MAC Control Element, when the RA procedure execution unit transmits Timing Advance by the Random Access procedure to the mobile station, the Timing Advance MAC Control Base station that discards Timing Advance by Element.
前記TA送信制御部は、前記RA手順実行部が前記Random Access手順によるRA Responseを前記移動局に送信した場合、前記RA手順実行部が前記Random Access手順を前記移動局に指示することを決定した場合、または前記RA手順実行部が前記移動局に対して前記Random Access手順の起動を下り制御チャネルを介して前記移動局に指示した場合、前記Timing Advance MAC Control ElementによるTiming Advanceを破棄する請求項1に記載の基地局。   The TA transmission control unit determines that the RA procedure execution unit instructs the mobile station to perform the Random Access procedure when the RA procedure execution unit transmits an RA Response based on the Random Access procedure to the mobile station. Or when the RA procedure execution unit instructs the mobile station to start the Random Access procedure via a downlink control channel, the Timing Advance by the Timing Advance MAC Control Element is discarded. The base station according to 1. 前記TA送信制御部は、前記Timing Advance MAC Control ElementによるTiming Advanceと異なるTiming Advanceを含むMAC-PDUが生成された場合、前記Timing Advance MAC Control ElementによるTiming Advanceを破棄する請求項1に記載の基地局。   The base according to claim 1, wherein the TA transmission control unit discards the Timing Advance by the Timing Advance MAC Control Element when a MAC-PDU including a Timing Advance different from the Timing Advance by the Timing Advance MAC Control Element is generated. Bureau. 前記TA送信制御部は、前記Timing Advance MAC Control ElementによるTiming AdvanceがハイブリッドARQによる再送対象のTiming Advanceである場合、Timing Advance MAC Control ElementによるTiming Advanceを破棄せずに送信する請求項1に記載の基地局。   The said TA transmission control part is transmitted without discarding Timing Advance by Timing Advance MAC Control Element, when Timing Advance by said Timing Advance MAC Control Element is Timing Advance of retransmission object by hybrid ARQ. base station. 上りリンクにおける移動局からの送信タイミングのずれを検出し、Timing Advanceを前記移動局に送信することによって、前記送信タイミングを調整する通信装置による送信タイミング調整方法であって、
前記上りリンクにおける同期外れを検出するステップと、
前記同期外れが検出された場合、Timing Advance MAC Control ElementによるTiming Advanceの送信を中断するステップと、
Random Access手順に従ったTiming Advanceを前記移動局に送信するステップと、
前記Timing Advance MAC Control ElementによるTiming Advanceの送信を決定した後に、前記Random Access手順によるTiming Advanceを前記移動局に送信した場合、前記Timing Advance MAC Control ElementによるTiming Advanceを破棄するステップと
を有する送信タイミング調整方法。
A transmission timing adjustment method by a communication device that adjusts the transmission timing by detecting a shift in transmission timing from the mobile station in the uplink and transmitting Timing Advance to the mobile station,
Detecting loss of synchronization in the uplink;
When the loss of synchronization is detected, the step of interrupting the transmission of Timing Advance by the Timing Advance MAC Control Element;
Transmitting Timing Advance according to the Random Access procedure to the mobile station;
After deciding transmission of Timing Advance by the Timing Advance MAC Control Element, when transmitting Timing Advance by the Random Access procedure to the mobile station, a transmission timing including a step of discarding the Timing Advance by the Timing Advance MAC Control Element Adjustment method.
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