JP3580423B2 - Transmission power control system - Google Patents

Transmission power control system Download PDF

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Publication number
JP3580423B2
JP3580423B2 JP2001350232A JP2001350232A JP3580423B2 JP 3580423 B2 JP3580423 B2 JP 3580423B2 JP 2001350232 A JP2001350232 A JP 2001350232A JP 2001350232 A JP2001350232 A JP 2001350232A JP 3580423 B2 JP3580423 B2 JP 3580423B2
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Japan
Prior art keywords
transmission power
wireless
control system
base station
power control
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JP2001350232A
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JP2003152641A (en
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大輔 小椋
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NEC Corp
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NEC Corp
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【０００１】
【発明の属する技術分野】
本発明は、送信電力制御システムに関し、特に、無線基地局から携帯電話機やＰＨＳなどの無線通信機への送信電力を制御する送信電力制御システムに関する。
【０００２】
【従来の技術】
従来、複数の無線基地局から携帯電話機に対して送られる各送信電力を、無線ネットワーク制御装置で定期的に取得して、それらの送信電力を相互に比較して、その中で最小の送信電力を送っている無線基地局を特定する。そして、特定した無線基地局の送信電力と同じ送信電力になるように、他の無線基地局の送信電力を変更する。こうして、各無線基地局の低消費電力化を図っていた。
【０００３】
【発明が解決しようとする課題】
しかし、従来の技術は、各無線基地局の低消費電力化を図ることを目的として送信電力を決定したので、通信品質が必ずしもよくなるような送信電力が決定されていなかった。その一方で、通信品質を優先させて送信電力を決定しても、無線基地局の消費電力はさほど高くならない。
【０００４】
そこで、本発明は、このような事情を考慮して、無線基地局から通信品質が向上するような送信電力を決定できるようにすることを課題とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するために、本発明の送信電力制御システムは、複数の無線基地局から無線通信機に対して送る各送信電力を定期的に取得して記憶しておくメモリと、前記各無線基地局のうち前記無線通信機との間の無線回線の品質が最良である無線基地局を選択する選択手段と、前記選択手段で選択された無線基地局の送信電力を前記メモリから読み出して他の無線基地局から送られている送信電力を当該送信電力に変更する変更手段とを備える。
【０００６】
【発明の実施の形態】
以下、本発明の実施形態について図面を参照して説明する。
【０００７】
［構成の説明］
図１は、本発明の実施形態の送信電力制御システムの模式的な構成を示すブロック図である。図１には、携帯電話機やＰＨＳなどのユーザ端末（Ｕｓｅｒ Ｅｑｕｉｐｍｅｎｔ：ＵＥ）１０と、ユーザ端末１０との間で無線接続される無線基地局（Ｂａｓｅ Ｔｒａｎｓｃｅｉｖｅｒ Ｓｔａｔｉｏｎ：ＢＴＳ）２１〜２３と、無線基地局２１〜２３からユーザ端末１０に対して送る送信電力を制御する無線ネットワーク制御装置（Ｒａｄｉｏ Ｎｅｔｗｏｒｋ Ｃｏｎｔｒｏｌｌｅｒ：ＲＮＣ）３１，３２と、無線ネットワーク制御装置３１，３２を接続する移動通信交換局（Ｍｏｂｉｌ−ｓｅｒｖｉｃｅ Ｓｗｉｔｃｈｉｎｇ Ｃｅｎｔｅｒ：ＭＳＣ）４０とを示している。
【０００８】
なお、無線ネットワーク制御装置（Ｓｅｒｖｉｎｇ−ＲＮＣ：Ｓ−ＲＮＣ）３１とは、ユーザ端末１０が通信を行う際に最初にアクセスした無線ネットワーク制御装置を指し、無線ネットワーク制御装置（Ｄｒｉｆｔ−ＲＮＣ：Ｄ−ＲＮＣ）３２とは、ユーザ端末１０がハンドオーバすることによってアクセス先の無線基地局が変わり且つその無線基地局の接続先が無線ネットワーク制御装置３１でない無線ネットワーク制御装置を指す。
【０００９】
また、ユーザ端末１０と無線基地局２１〜２３とを結ぶ回線（Ｕｕ）は、例えばＲＲＣ（Ｒａｄｉｏ Ｒｅｓｏｕｒｃｅ Ｃｏｎｔｒｏｌ）というプロトコルに基づいて管理され、無線ネットワーク制御装置３１，３２と無線基地局２１〜２３とを結ぶ回線（Ｉｕｒ）は、例えばＮＢＡＰ（Ｎｏｄｅ−Ｂ Ａｐｐｌｉｃａｔｉｏｎ Ｐｏｒｔ）というプロトコルに基づいて管理され、無線ネットワーク制御装置３１，３２と移動通信交換局４０とを結ぶ回線（Ｉｕｒ）は、例えばＲＡＮＡＰ（Ｒａｄｉｏ Ｎｅｔｗｏｒｋ Ｓｕｂｓｙｓｔｅｍ Ａｐｐｌｉｃａｔｉｏｎ Ｐｏｒｔ）というプロトコルに基づいて管理されるようにしている。
【００１０】
図２は、図１の無線ネットワーク制御装置３１，３２の模式的な内部構成を示すブロック図である。図２には、無線基地局２１〜２３からユーザ端末１０への各送信電力を定期的に取得して記憶しておくメモリ５１と、無線基地局２１〜２３から送信されるフレームのヘッダを参照する参照手段５２と、参照手段５２の参照結果に基づいてユーザ端末１０との間の無線回線の品質が最良である無線基地局を選択する選択手段５３と、選択手段５３で選択された無線基地局の送信電力をメモリ５１から読み出してその送信電力に変更するように無線基地局２１〜２３の送信電力を制御する送信電力制御手段５４とを示している。
【００１１】
なお、ここでは無線ネットワーク制御装置３１，３２は、レイヤ３を管理するソフトウェア部であるアプリケーション（ＡＰ）５５と、レイヤ１，レイヤ２を管理するソフトウェア・ファームウェア・ハードウェア部であるプラットフォーム（ＰＦ）５６とに大別した様子を示している。
【００１２】
参照手段５２及び選択手段５３は、プラットフォーム５６に備えているダイバーシチハンドオーバトランク（Ｄｉｖｅｒｓｉｔｙ Ｈａｎｄ−ｏｖｅｒ Ｔｒｕｎｋ）５７内に設けている。メモリ５１及び送信電力制御手段５４は、アプリケーション５５に備えている。
【００１３】
なお、メモリ５１や送信電力送信手段５４は一方或いは双方ともに移動通信交換局４０に備えるようにしてもよい。
【００１４】
［動作の説明］
つぎに、図１の送信電力制御システムの動作についてユーザ端末１０として携帯電話機やＰＨＳを適用した場合を想定して説明する。
【００１５】
まず、ユーザ端末１０が無線通信を行うときには、送信対象の情報をフレームのペイロードに格納するとともに、宛先をフレームのヘッダに格納してから無線基地局２１〜２３に送信している。
【００１６】
無線基地局２１〜２３は、ユーザ端末１０から送信されたフレームのペイロードに格納されている情報が正しいかどうかをパリティなどによって判別し、判別結果に基づくユーザ端末１０との間の通信品質の良し悪しを示す情報をヘッダに格納して無線ネットワーク制御装置３１へ送る。
【００１７】
ここで、無線ネットワーク制御装置３１は、無線基地局２１〜２３からユーザ端末１０への各送信電力を定期的に取得して、メモリ５１に記憶しておく。なお、無線ネットワーク制御装置３１は、無線基地局２１，２２からの送信電力については直接取得し、無線基地局２３からの送信電力については無線ネットワーク制御装置３２を経由して取得している。
【００１８】
そして、無線ネットワーク制御装置３１では、参照手段５２によって無線基地局２１〜２３から送られたフレームのヘッダの参照を行い、選択手段５３で参照手段５２の参照結果に基づいてユーザ端末１０との間の無線回線の品質が最良である無線基地局を選択する。
【００１９】
そして、送信電力制御手段５４によって選択手段５３で選択された無線基地局の送信電力をメモリ５１から読み出して、無線基地局２１〜２３の送信電力を無線回線の品質が最良である無線基地局の送信電力に変更するように、送信電力を取得したときの経路で指示を送る。
【００２０】
また、無線ネットワーク制御装置３１は、ユーザ端末１０から送信されたフレームを移動通信交換局４０へ送る。移動通信交換局４０は、無線ネットワーク制御装置３１から送られたフレームを、そのヘッダに格納されている宛先に従ってユーザ端末１０の通信相手に送る。
【００２１】
無線基地局２１〜２３は、送信電力制御手段５４から送られた指示に従ってユーザ端末１０への送信電力を変更する。なお、ユーザ端末１０がハンドオーバした場合には、ハンドオーバ先の無線基地局の送信電力が変更される。
【００２２】
また、本実施形態では、ユーザ端末１０として携帯電話機やＰＨＳを適用した場合を想定して説明したが、例えばユーザ端末１０としてパーソナルコンピュータを用いて、ブルートゥースなどのローカルエリアネットワークを介して無線通信を行うような場合であっても、同様の手順でパーソナルコンピュータへの送信電力を制御するようにすればよい。
【００２３】
【発明の効果】
以上、説明したように、本発明によると、無線基地局から通信品質が向上するような送信電力を決定できる。
【図面の簡単な説明】
【図１】本発明の実施形態１の送信電力制御システムの模式的な構成を示すブロック図である。
【図２】図１の無線ネットワーク制御装置３１，３２の模式的な内部構成を示すブロック図である。
【符号の説明】
１０ ユーザ端末
２１〜２３ 無線基地局
３１，３２ 無線ネットワーク制御装置
４０ 移動通信交換局
５１ メモリ
５２ 参照手段
５３ 選択手段
５４ 送信電力制御手段[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission power control system, and more particularly to a transmission power control system that controls transmission power from a wireless base station to a wireless communication device such as a mobile phone or a PHS.
[0002]
[Prior art]
Conventionally, each transmission power transmitted from a plurality of radio base stations to a mobile phone is periodically acquired by a radio network controller, and the transmission powers are compared with each other, and the minimum transmission power among them is obtained. Identify the wireless base station that is sending Then, the transmission power of the other radio base station is changed so that the transmission power becomes the same as the transmission power of the specified radio base station. Thus, the power consumption of each wireless base station has been reduced.
[0003]
[Problems to be solved by the invention]
However, in the related art, the transmission power is determined for the purpose of reducing the power consumption of each radio base station, so that the transmission power that always improves the communication quality has not been determined. On the other hand, even if the transmission power is determined with priority given to the communication quality, the power consumption of the radio base station does not increase so much.
[0004]
Therefore, an object of the present invention is to allow a radio base station to determine transmission power that improves communication quality in consideration of such circumstances.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, a transmission power control system according to the present invention includes: a memory for periodically acquiring and storing transmission powers transmitted from a plurality of radio base stations to a radio communication device; Selecting means for selecting a radio base station having the best quality of a radio link between the base station and the radio communication device, and reading the transmission power of the radio base station selected by the selecting means from the memory, Changing means for changing the transmission power transmitted from the wireless base station to the transmission power.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
[Description of configuration]
FIG. 1 is a block diagram showing a schematic configuration of the transmission power control system according to the embodiment of the present invention. FIG. 1 shows a user terminal (User Equipment: UE) 10 such as a mobile phone or a PHS, wireless base stations (Base Transceiver Stations: BTS) 21 to 23 wirelessly connected to the user terminal 10, and wireless base stations. Radio network controllers (RNCs) 31 and 32 for controlling transmission power transmitted from the stations 21 to 23 to the user terminal 10 and mobile communication switching stations (Mobil-) connecting the radio network controllers 31 and 32. service switching center (MSC) 40.
[0008]
The radio network controller (Serving-RNC: S-RNC) 31 refers to the radio network controller that the user terminal 10 first accessed when performing communication, and the radio network controller (Drift-RNC: D-RNC). The RNC 32 indicates a wireless network control device whose access destination wireless base station changes due to the handover of the user terminal 10 and whose wireless base station connection destination is not the wireless network control device 31.
[0009]
A line (Uu) connecting the user terminal 10 and the radio base stations 21 to 23 is managed based on, for example, a protocol called RRC (Radio Resource Control), and the radio network controllers 31 and 32 and the radio base stations 21 to 23 are managed. (Iur) is managed based on, for example, a protocol called NBAP (Node-B Application Port), and the line (Iur) connecting the radio network controllers 31 and 32 and the mobile communication switching center 40 is, for example, RANAP. (Radio Network Subsystem Application Port).
[0010]
FIG. 2 is a block diagram showing a schematic internal configuration of the wireless network control devices 31 and 32 of FIG. FIG. 2 shows a memory 51 for periodically acquiring and storing each transmission power from the radio base stations 21 to 23 to the user terminal 10 and a header of a frame transmitted from the radio base stations 21 to 23. Reference means 52, a selection means 53 for selecting a radio base station having the best quality of the radio link with the user terminal 10 based on the reference result of the reference means 52, and a radio base station selected by the selection means 53 The transmission power control means 54 reads the transmission power of the station from the memory 51 and controls the transmission power of the radio base stations 21 to 23 so as to change the transmission power to the transmission power.
[0011]
Here, the radio network controllers 31 and 32 are an application (AP) 55 which is a software unit for managing layer 3 and a platform (PF) which is a software / firmware / hardware unit for managing layer 1 and layer 2. 56 is roughly classified.
[0012]
The reference unit 52 and the selection unit 53 are provided in a diversity handover trunk 57 provided on the platform 56. The memory 51 and the transmission power control unit 54 are provided in the application 55.
[0013]
One or both of the memory 51 and the transmission power transmitting means 54 may be provided in the mobile communication switching center 40.
[0014]
[Description of operation]
Next, the operation of the transmission power control system of FIG. 1 will be described on the assumption that a mobile phone or a PHS is applied as the user terminal 10.
[0015]
First, when the user terminal 10 performs wireless communication, the information to be transmitted is stored in the payload of the frame, the destination is stored in the header of the frame, and then transmitted to the wireless base stations 21 to 23.
[0016]
The radio base stations 21 to 23 determine whether or not the information stored in the payload of the frame transmitted from the user terminal 10 is correct based on the parity or the like, and based on the determination result, determine whether the communication quality with the user terminal 10 is good. The information indicating the badness is stored in the header and sent to the wireless network control device 31.
[0017]
Here, the wireless network control device 31 periodically acquires each transmission power from the wireless base stations 21 to 23 to the user terminal 10 and stores it in the memory 51. Note that the wireless network control device 31 directly obtains transmission power from the wireless base stations 21 and 22 and obtains transmission power from the wireless base station 23 via the wireless network control device 32.
[0018]
Then, in the wireless network control device 31, the reference unit 52 refers to the header of the frame transmitted from the wireless base stations 21 to 23, and the selection unit 53 communicates with the user terminal 10 based on the reference result of the reference unit 52. Select the radio base station with the best radio link quality.
[0019]
Then, the transmission power of the radio base station selected by the selection unit 53 by the transmission power control unit 54 is read from the memory 51, and the transmission power of the radio base stations 21 to 23 is determined by the transmission power of the radio base station having the best radio channel quality. An instruction is sent on the route when the transmission power was acquired so as to change to the transmission power.
[0020]
Further, the wireless network control device 31 sends the frame transmitted from the user terminal 10 to the mobile communication switching center 40. The mobile switching center 40 sends the frame sent from the radio network controller 31 to the communication partner of the user terminal 10 according to the destination stored in the header.
[0021]
The radio base stations 21 to 23 change the transmission power to the user terminal 10 according to the instruction sent from the transmission power control means 54. When the user terminal 10 performs a handover, the transmission power of the handover destination radio base station is changed.
[0022]
Further, in the present embodiment, the description has been made assuming a case where a mobile phone or a PHS is applied as the user terminal 10. Even in such a case, the transmission power to the personal computer may be controlled in a similar procedure.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to determine the transmission power at which the communication quality is improved from the radio base station.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of a transmission power control system according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a schematic internal configuration of the wireless network control devices 31 and 32 of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 User terminal 21-23 Radio base station 31, 32 Radio network controller 40 Mobile switching center 51 Memory 52 Reference means 53 Selection means 54 Transmission power control means

Claims (6)

複数の無線基地局から無線通信機に対して送る各送信電力を定期的に取得して記憶しておくメモリと、前記各無線基地局のうち前記無線通信機との間の無線回線の品質が最良である無線基地局を選択する選択手段と、前記選択手段で選択された無線基地局の送信電力を前記メモリから読み出して他の無線基地局から送られている送信電力を当該送信電力に変更する変更手段とを備えることを特徴とする送信電力制御システム。A memory for periodically acquiring and storing each transmission power transmitted from a plurality of wireless base stations to the wireless communication device, and a quality of a wireless line between the wireless communication device and the wireless communication device among the wireless base stations. Selecting means for selecting the best radio base station; reading the transmission power of the radio base station selected by the selection means from the memory and changing the transmission power transmitted from another radio base station to the transmission power; A transmission power control system, comprising: 前記無線通信機と前記各無線基地局との間で通信されるフレームのヘッダには、無線回線の品質を示す情報が格納されており、前記選択手段は、前記情報に基づいて無線回線の品質が最良である無線基地局を選択することを特徴とする請求項１記載の送信電力制御システム。In the header of a frame communicated between the wireless communication device and each of the wireless base stations, information indicating the quality of the wireless channel is stored, and the selection unit performs the quality of the wireless channel based on the information. 2. The transmission power control system according to claim 1, wherein a radio base station which is best is selected. 少なくとも前記選択手段を前記各無線基地局に接続されている無線ネットワーク制御装置に備えることを特徴とする請求項１記載の送信電力制御システム。The transmission power control system according to claim 1, wherein at least the selection unit is provided in a radio network controller connected to each of the radio base stations. さらに、前記メモリ及び前記変更手段を前記無線ネットワーク制御装置に備えることを特徴とする請求項３記載の送信電力制御システム。The transmission power control system according to claim 3, further comprising the memory and the change unit in the wireless network control device. 前記無線通信機は、移動無線通信機であることを特徴とする請求項１記載の送信電力制御システム。The transmission power control system according to claim 1, wherein the wireless communication device is a mobile wireless communication device. 前記無線通信機は、携帯電話機であることを特徴とする請求項１記載の送信電力制御システム。The transmission power control system according to claim 1, wherein the wireless communication device is a mobile phone.
JP2001350232A 2001-11-15 2001-11-15 Transmission power control system Expired - Fee Related JP3580423B2 (en)

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