JP4835951B2 - 無線通信システムとその送信電力制御方法 - Google Patents
無線通信システムとその送信電力制御方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
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- H04W74/00—Wireless channel access
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- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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Description
ここで、P_CPICH_Tx [dBm]は基地局が送信する共通パイロット信号(CPICH:Common Pilot Channel)の送信電力、UL_Interference [dBm]、Constant_Value [dB]は所定の電力オフセットであり、セル内の移動局に共通なシステムパラメータとして報知チャネル等でセル内の移動局に通知されている。また、CPICH_RSCP [dBm]は移動局が所定の周期で測定するCPICHの受信電力レベルである。
3GPP TS25.214 v6.6.0 (2005-06) 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical layer procedures (FDD) (Release 6) 3GPP TS25.331 v6.6.0 (2005-06) 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Radio Resource Control (RRC); Protocol Specification (Release 6) 3GPP TR25.814 v0.2.0 (2005-08) 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical Layer Aspects for Evolved UTRA (Release7)
RACHが正しく受信されるまでに要する再送回数が増加し、RACHの送信遅延が増加し、サービス品質が劣化するという問題点がある。特に、電力Ramp-upを行わないような場合は、受信失敗したにも関わらず常に同じ電力でしか送信できないため、電力が不足した状態でしか再送できず、最悪の場合は最大再送回数まで送信してもRACHが正しく受信されない状況に陥り、通信不能となってしまうという問題点がある。
隣接するセル、または自セル内の他ユーザ(WCDMAの場合)への干渉を増加させてしまうという問題点がある。また、移動局の消費電力も増加するという問題点もある。
12 信号分離部
13 パイロット信号測定部
14 電力算出部
15 送達確認信号判定部
16 送信回数計測部
17 バッファ
18 信号合成部
19 送信処理部
20 プリアンブル生成部
21 受信処理部
22 復号部
23 誤り判定部
24 信号分離部
25 送信回数算出部
26 電力オフセット制御部
27 制御信号生成部
28 信号合成部
29 送信処理部
システム情報など報知情報を送信する報知チャネル(BCH:Broadcast Channel)、
パイロット信号を送信する共通パイロットチャネル(CPICH:Common Pilot Channel)、
上り回線におけるデータ送信に対する送達確認情報を送信する送達確認チャネル(AICH:Accuision Indicator Channel)
を少なくとも送信している。
1.移動局が送信遅延推測情報としてRACHの再送回数、または送信回数を送信する。ここで、再送回数と送信回数の関係は、再送回数=送信回数−1となるものとし、以後の実施形態では送信回数を用いて説明するものとする。
2.基地局がRACHの送信電力に関する情報として、電力オフセットを通知し、移動局はCPICHの受信電力と電力オフセットに基づいてRACHの電力を決定する(開ループ型電力制御)。
3.移動局はデータ再送時も同じ電力で送信する。
4.移動局は図3におけるデータ送信時に送信遅延推測情報を付して送信する。
点である。なお、実施例1から実施例6までは図3におけるシステムを用いて説明する。
所定時間の後、下り回線のAICHを受信し(ステップ17)、送達確認情報としてACK信号を受信した場合は、再びステップ11に戻り(ステップ18でYES)、ACK信号を受信しなかった場合は、送信回数算出部にて送信回数情報を1増加させ(ステップ19)、ステップ15に戻り、先に送信したデータと同じデータを送信する。移動局は、データ送信から所定時間の後に送られるAICHにおいてACK信号を受信するか、所定の最大送信回数に到達するまで、以上の動作を繰り返す。
If N_ave > N_target
PO_update = PO_current + Δup [dB] (ステップ38)
If N_ave < N_target
PO_update = PO_current - Δdown [dB] (ステップ39)
ここで、ΔupとΔdownの関係はΔup > Δdownとする。
ただし、再送回数を用いる場合は、(送信回数−1)を再送回数とする。
If N_ave > N_target
P_Tx_update = P_Tx_current + Δup [dB]
If N_ave < N_target
P_Tx_update = P_Tx_current - Δdown [dB]
基地局において更新されたP_Txは、BCHにおいてシステム情報として移動局に通知される。それ以外の動作は、第1の実施例と同様である。
If T_ave > T_target
PO_update = PO_current + Δup [dB] (ステップ68)
If T_ave < T_target
PO_update = PO_current - Δdown [dB] (ステップ69)
ここで、ΔupとΔdownの関係はΔup > Δdownとする。
所定時間の後、下り回線のAICHを受信し(ステップ77)、送達確認情報としてACK信号を受信した場合は(ステップ78,80でYES)、RACHにてデータと送信回数情報を送信し(ステップ81)、再びステップ71に戻る。ACK信号を受信せず、且つ最大送信回数より送信回数が小さい場合は(ステップ78でNO)、送信回数算出部において送信回数情報を1増加させ(ステップ79)、ステップ75に戻る。また、ACK信号を受信せず、且つ送信回数が最大送信回数に達した場合は(ステップ80でNO)、再びステップ71に戻る。
Claims (8)
- 移動局の送信電力を制御する方法であって、
基地局が、ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を前記移動局に通知し、
前記移動局が、前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を前記基地局に送信し、
前記プリアンブルの送信回数に応じて前記送信電力情報を変更し、
変更した送信電力情報を前記移動局に通知することを特徴とする送信電力制御方法。 - 基地局が移動局の送信電力を制御する無線通信システムであって、
ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を移動局に通知し、移動局から受信したプリアンブル送信回数を含む情報に応じて前記ランダムアクセスに関する前記送信電力情報を変更し、変更した送信電力情報を前記移動局に通知する基地局と、
前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を送信する移動局と、
を有することを特徴とする無線通信システム。 - ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を移動局に通知する手段と、
前記移動局から、前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を受信する手段と、
前記プリアンブル送信回数に応じて前記送信電力情報を変更し、変更した送信電力情報を前記移動局に通知する手段と、
を有することを特徴とする基地局。 - 基地局から、ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を受信する手段と、
前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を前記基地局に送信する手段と、
前記プリアンブル送信回数に応じて前記基地局により変更された送信電力情報に応じて、前記プリアンブル送信電力を制御する手段と、
を有することを特徴とする移動局。 - 基地局が移動局の送信電力を制御する方法であって、
ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を前記移動局に通知し、
前記移動局から、前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を受信し、
前記プリアンブル送信回数に応じて前記送信電力情報を変更し、変更した送信電力情報を前記移動局に通知することを特徴とする基地局による移動局送信電力制御方法。 - 移動局の送信電力を制御する方法であって、
基地局から、ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を受信し、
前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を前記基地局に送信し、
前記プリアンブル送信回数に応じて前記基地局により変更された送信電力情報に応じて、前記プリアンブル送信電力を制御することを特徴とする移動局の送信電力制御方法。 - ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を移動局に通知する機能と、
前記移動局から、前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を受信する機能と、
前記プリアンブル送信回数に応じて前記送信電力情報を変更する機能と、
変更した送信電力情報を前記移動局に通知する機能と、
をコンピュータに実現させることを特徴とする基地局制御プログラム。 - 基地局から、ランダムアクセスチャネルのプリアンブル送信電力を制御する送信電力情報を受信する機能と、
前記ランダムアクセスチャネルに関するプリアンブル送信回数を含む情報を前記基地局に送信する機能と、
前記プリアンブル送信回数に応じて前記基地局により変更された送信電力情報に応じて、前記プリアンブル送信電力を制御する機能と、
をコンピュータに実現させることを特徴とする移動局制御プログラム。
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US7949377B2 (en) | 2005-12-14 | 2011-05-24 | Research In Motion Limited | Method and apparatus for user equipment directed radio resource control in a UMTS network |
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US10750545B2 (en) | 2020-08-18 |
US20160242214A1 (en) | 2016-08-18 |
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WO2007052753A1 (ja) | 2007-05-10 |
US11672020B2 (en) | 2023-06-06 |
US20230254904A1 (en) | 2023-08-10 |
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US11134520B2 (en) | 2021-09-28 |
GB2445336A8 (en) | 2010-09-08 |
US8515480B2 (en) | 2013-08-20 |
CN101300757B (zh) | 2017-08-11 |
JPWO2007052753A1 (ja) | 2009-04-30 |
JP5177717B2 (ja) | 2013-04-10 |
GB2445336A (en) | 2008-07-02 |
GB2445336B (en) | 2010-12-08 |
GB2469229B (en) | 2011-02-02 |
GB0807773D0 (en) | 2008-06-04 |
US20210385875A1 (en) | 2021-12-09 |
US12127262B2 (en) | 2024-10-22 |
GB201010851D0 (en) | 2010-08-11 |
US20190239256A1 (en) | 2019-08-01 |
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US10306678B2 (en) | 2019-05-28 |
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