1309929 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種無線裝置及其電場強度臨限值設定 方法，其適用於TDMA等方式之行動通訊系統。 【先前技術】 先前已知有-種行動通訊系統之通訊方式TMA(Time1309929 IX. Description of the Invention: [Technical Field] The present invention relates to a wireless device and an electric field strength threshold setting method thereof, which are applicable to a mobile communication system such as TDMA. [Prior Art] It is previously known that there is a communication method of mobile communication system TMA (Time
Dlvlsl°nMultiple AGGess)mh多路構成無線 基地台與無線行動台間之無線區間，以進行控制資料以及 聲音等通訊資料之存取。魏方式中，複數個無線基地台 分別以既定週期透過同一個無線頻道發送下傳控制訊號 (送往無線行動台之控制訊號），各無線行動台透^固 無線頻道接收複數個無線基地台發送之下傳控制訊號。接 著，無線行動台從複數個無線基地台發送之下傳控制訊號 中選擇收訊電場強度高之訊號來進行同步建立動作。例 如，在記載於日本專利特開平8_182041號公報之習知技 術，無線行動台係設定電場強度臨限值來判定收訊電場強 度高之訊號’例如’最初設定較低之電場強度臨限值，之 後設定較高之電場強度臨限值。 【發明内容】 2是，在習知技術中，並未揭示具體之電場強度臨限 值決疋法’且在如何高效率判定收訊電場強度高之气號方 面，存有技術上不成熟之問題。例如’以最初之電場強度 臨限值判定某無線基地台發送之下傳控制訊號為有效，但 僅使用於下次判定之電場強度臨限值比最初值高的情形， 5 1309929 未必忐將收訊電場強度較高之訊號判定為有效。舉具體之 事〗彳丨如，即使在第二個接收之下傳控制訊號之收訊電 場強度比最初接收之下傳控制訊號之收訊電場強度小的情 •形，若第二個訊號之電場強度臨限值比最初訊號之電場強 度臨限值两但比雙方之下傳控制訊號之收訊電場強度小， 這時第二個接收之下傳控制訊號會判定為有效。結果，發 生收訊電場強度小之訊號使用於同步建立之狀況。 Φ 又考慮2個無線基地台發送之下傳控制訊號重疊的 狀況（麥考特開平8_182〇41號公報之圖3)。此時，以最初 之電場強度臨限值係判定下傳控制訊號（31)為有效，接著 以更高之電場強度臨限值係判定下一個下傳控制訊號（32) 為有效。但是，2個下傳控制訊號（31)、（32)之重疊期間 中 CIR(Carrier to Interference Ratio;載波對干擾波 比）會降低，應使用收訊電場強度較高之下傳控制訊號（32) 之同步建立動作有失敗之虞。 • 本發明係考量如此狀況而構成，其目的在提供一種無 線裝置以及其電場強度臨限值設定方法，係利用臨值限判 疋，以高效率從複數個無線基地台發送之下傳控制訊號中 選擇收訊電場強度高之訊號。 為解決上述課題’本發明之無線裝置，其特徵在於， ' 係具備： ' 收afl電場強度檢測機構，係檢測出所收訊之接收訊號 的電場強度； 臨限值判定機構’以電場強度臨限值判定收訊電場強 1309929 度； 收訊處理機構，根據判定結果，下傳控制訊號之 電場強度高於電場強度臨限值時，利用該下傳控 淮 行同步建立；以及 现進 :場強度臨限值算出機構，根據檢測出之收訊 度來算出電場強度臨限值’ i更新臨限值敎機構使: 電場強度臨限值。 本發明之無線裝置中，該電場強度臨限值算出機構， 係將檢測出之收訊電場強度加上既定值來作為電場強度臨 本發明之無線裝置中，該收訊電場強度之強度增加量， 係相田於可確保實用上沒問題錯誤率之載波對干擾波比。 ,本發明之無線裝置中，該電場強度臨限值算出機構， 當臨限值判定結果為檢測出之收訊電場強度比電場強度臨 限值高之情形’會進行電場強度臨限值之更新。 本發明之無線裝置中，該收訊處理機構，係使用接收 訊號具有之位元同步用訊號以及接續在該位元同步用訊號 後之帕同步用訊號來進行同步建立之解調機構； 該電場強度臨限值算出機構，係檢測出位元同步用訊 號後開始計算電場強度臨限值。 本毛明之無線裝置中，該收訊處理機構，係使用接收 訊號具有之位元同步用訊號以及接續在該位元同步用訊號 後之幢同步用訊號來進行同步建立之解調機構； “電泵強度£»限值算出機構，係檢測出幀同步用訊號 1309929 後開始計算電場強度臨限值。 本發明之無線裝置中，該解調機構，當檢測出之收訊 •電場強度比電場強度臨限值高之情形，會進行同步訊號之 再檢測。 本發明之電場強度臨限值設定方法，係用於無線裝置 之電場強度臨限值設定方法，該無線裝置係以電場強度臨 限值來判定無線收訊之接收訊號之收訊電場強度；其特徵 • 在於係含有： 檢測過程，用來檢測出無線收訊之接收訊號之收訊電 場強度； 算出過程，根據收訊電場強度來算出電場強度臨限值； 以及 * 更新過程’根據具出之電場強度臨限值來更新該判定 中使用之電場強度臨限值。 本發明之電場強度臨限值設定方法中，該算出電場強 φ 度臨限值過程’係將檢測出之收訊電場強度加上既定值來 作為電場強度臨限值。 本發明之電場強度臨限值設定方法中，該收訊電場強 度之強度增加量’係相當於可確保實用上沒問題錯誤率之 載波對干擾波比。 本發明之電場強度臨限值設定方法中，該算出電場強 • 度臨限值過程，當臨限值判定結果為檢測出之收訊電場強 度比電場強度臨限值高之情形，會進行電場強度臨限值之 更新。 1309929 本發明之電場強度臨限值設定方法中，該無線裝置 係使用接收訊號具有之位元同步用訊號以及接續在該位_ 同步用訊號後之幀同步用訊號來進行同步建立； . 該電場強度臨限值算出過程，係檢測出位元同步用、 號後開始計算電場強度臨限值。 本發明之電場強度臨限值設定方法中，該無線裳置， 係使用接收訊號具有之位元同步用訊號以及接續在該位_ _ 同步用訊號後之幀同步用訊號來進行同步建立； 該電場強度臨限值算出過程，係檢測出幀同步用訊號 後開始計算電場強度臨限值。 本發明之電場強度臨限值設定方法中，該無線裝置， 當檢測出之收訊電場強度比電場強度臨限值高之情形， 進行同步訊號之再檢測。 ,$據本發明，根據無線收訊之接收訊號之收訊電場強 度來算出電場強度臨限值。從使用此電場強度臨限值進 •臨限值判定的結果判斷接收訊號之有效性。據此，可藉: t限值判定從複數個無線基地台發送之下傳控制訊號；以 南效率選擇收訊電場強度較高之訊號。 【實施方式】 接下來參考圖式說明本發明之一實施型態。 1圖1係顯示本發明一實施型態之無線行動台1〇之收訊 二之方塊圖。_ 1所示之無線行動台（以下簡稱「行動 :」，)复 10 ’係圖2所示之TDMA方式之行動通訊系統之行動 '、透過刀日守多路構成之同一無線頻道來接收複數個無 1309929 、、友土也口 11 1、2、3、4、…、η發送之下傳控制訊號，從 這些下傳控制訊號中選擇收訊電場強度高之訊號進行同步 建立動作，且接收無線基地台發送之控制情報。 圖3所示為下傳控制訊號之構成例，圖3所示之下傳 =制汛號由位元同步用訊號21、幀同步用訊號2 2、資料 訊號23、及錯誤檢測訊號24組成，分別有既定之位元長The Dlvlsl°nMultiple AGGess) mh multiplexes the wireless zone between the wireless base station and the wireless mobile station for accessing control data and voice and other communication materials. In the Wei mode, a plurality of wireless base stations transmit downlink control signals (control signals sent to the wireless mobile station) through the same wireless channel in a predetermined period, and each wireless mobile station receives a plurality of wireless base stations through the fixed wireless channel. Under the control signal. Then, the wireless mobile station selects a signal with a high strength of the received electric field from a plurality of wireless base stations transmitting the downlink control signal to perform a synchronization establishment operation. For example, in the conventional technique disclosed in Japanese Laid-Open Patent Publication No. Hei 08-182041, the wireless mobile station sets the electric field intensity threshold to determine the signal strength ", for example, the initial setting of the lower electric field strength threshold. A higher electric field strength threshold is then set. SUMMARY OF THE INVENTION [2] In the prior art, the specific electric field strength threshold method is not disclosed, and there is a technical immaturity in how to efficiently determine the high electric field strength of the receiving electric field. problem. For example, 'the initial electric field strength threshold is used to determine that a radio base station transmits a downlink control signal, but only if the electric field strength threshold is determined to be higher than the initial value, 5 1309929 may not be received. The signal with a higher electric field strength is judged to be valid. For example, even if the second receiving signal transmits the control signal, the receiving electric field strength is smaller than the receiving electric field strength of the control signal transmitted under the first receiving, if the second signal is The electric field strength threshold is two times lower than the electric field strength threshold of the initial signal but less than the receiving electric field strength of the control signal transmitted by the two sides. At this time, the second receiving sub-control signal is determined to be valid. As a result, a signal in which the strength of the receiving electric field is small is used in the state of synchronization establishment. Φ Consider also the situation in which two radio base stations transmit the transmission control signals overlapping (Figure 3 of McCarty Kaiping 8_182〇41). At this time, it is determined that the downlink control signal (31) is valid by the initial electric field strength threshold, and then the next downlink control signal (32) is determined by the higher electric field strength threshold. However, the CIR (Carrier to Interference Ratio) in the overlap period of the two downlink control signals (31) and (32) is lowered, and the control signal should be transmitted under the higher strength of the received electric field (32). The synchronization of the establishment of the action has failed. The present invention is constructed in consideration of such a situation, and an object thereof is to provide a wireless device and an electric field intensity threshold setting method thereof, which use a threshold value to transmit a downlink control signal from a plurality of radio base stations with high efficiency. Select the signal that the received electric field strength is high. In order to solve the above-mentioned problem, the wireless device according to the present invention is characterized in that the 'system includes: 'the afl electric field intensity detecting means detects the electric field intensity of the received signal received; and the threshold determining means' limits the electric field strength The value of the receiving electric field is 1309999 degrees; the receiving processing mechanism, according to the determination result, when the electric field strength of the downlink control signal is higher than the electric field strength threshold, the lower control is used to establish the Huaihang synchronization; and the current: field strength The threshold calculation means calculates the electric field intensity threshold based on the detected degree of reception 'i update threshold 敎 mechanism: electric field strength threshold. In the wireless device of the present invention, the electric field intensity threshold calculating means adds the detected signal strength of the received electric field to the predetermined value as the electric field intensity in the wireless device of the present invention, and the intensity of the received electric field strength increases. , is a carrier-to-interference wave ratio that ensures a practically no problem error rate. In the wireless device of the present invention, the electric field intensity threshold calculating means updates the electric field strength threshold when the threshold value determination result is that the detected receiving electric field strength is higher than the electric field strength threshold value . In the wireless device of the present invention, the receiving processing mechanism uses a bit synchronization signal for receiving the signal and a demodulation mechanism for synchronizing the connection after the bit synchronization signal after the bit synchronization signal; The intensity threshold calculation means starts calculating the electric field intensity threshold after detecting the bit synchronization signal. In the wireless device of the present invention, the receiving processing mechanism uses a bit synchronization signal for receiving the signal and a demodulation mechanism for synchronizing the building synchronization signal after the bit synchronization signal; The pump strength £»limit calculation mechanism starts to calculate the electric field strength threshold after detecting the frame synchronization signal 1309949. In the wireless device of the present invention, the demodulation mechanism detects the received signal/electric field strength ratio electric field strength When the threshold value is high, the synchronization signal is re-detected. The electric field strength threshold setting method of the present invention is a method for setting the electric field strength threshold value of the wireless device, and the wireless device is based on the electric field intensity threshold. To determine the strength of the receiving electric field of the received signal of the wireless receiving; the feature is: the detecting process is used to detect the strength of the receiving electric field of the received signal of the wireless receiving; the calculation process is calculated according to the strength of the received electric field The electric field strength threshold; and * the update process 'updates the electric field strength used in the determination based on the potential of the electric field strength In the method for setting the electric field strength threshold value of the present invention, the method for calculating the electric field strength φ degree threshold value is to add the detected electric field strength to a predetermined value as the electric field strength threshold. In the intensity threshold setting method, the intensity increase amount of the received electric field strength is equivalent to a carrier-to-interference wave ratio which can ensure a practically no problem error rate. In the electric field intensity threshold setting method of the present invention, the calculation is performed. The electric field strength and degree threshold process, when the threshold value is determined to be higher than the detected electric field strength threshold, the electric field strength threshold is updated. 1309929 The electric field strength of the present invention In the limit setting method, the wireless device uses the bit synchronization signal of the received signal and the frame synchronization signal following the bit_synchronization signal to perform synchronization establishment; the electric field intensity threshold calculation process, After detecting the bit synchronization, the number of electric field strength thresholds is calculated. In the method for setting the electric field strength threshold value of the present invention, the wireless skirting is performed. The bit synchronization signal and the frame synchronization signal connected to the bit___synchronization signal are synchronously established; the electric field intensity threshold calculation process starts to calculate the electric field after detecting the frame synchronization signal In the method for setting the electric field strength threshold value of the present invention, the wireless device performs re-detection of the synchronization signal when the detected signal strength of the received electric field is higher than the threshold value of the electric field strength. According to the invention, the electric field intensity threshold is calculated based on the received electric field strength of the received signal of the wireless reception. The validity of the received signal is judged from the result of using the electric field strength threshold and the threshold value. The t-limit value determines that the downlink control signal is transmitted from the plurality of radio base stations; the south-frequency efficiency selects the signal with the higher received-field strength. [Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a block diagram showing the reception of the wireless mobile station 1 according to an embodiment of the present invention. The wireless mobile station (hereinafter referred to as "action:") shown in _1 is the same as the action of the TDMA mobile communication system shown in Figure 2, and receives the plural through the same wireless channel formed by the knives. No 113099929, 友土也口11 1 , 2, 3, 4, ..., η send the control signal below, select the signal with high electric field strength from these downlink control signals to synchronize the establishment action, and receive Control information sent by the wireless base station. FIG. 3 shows an example of a configuration of a downlink control signal. The transmission code of the lower transmission signal shown in FIG. 3 is composed of a bit synchronization signal 21, a frame synchronization signal 2, a data signal 23, and an error detection signal 24. Each has a predetermined bit length
度。又，圖2之控制台12容納複數個無線基地台（以下簡 稱「基地台」）11-1〜η。 1中’收§fl RF部1接收既定之無線頻道之訊號，電 :強度檢測部2檢測收訊RF部丨收訊之接收訊號之收訊 =強度，電場強度臨限值判…用電場強度臨限值對 二麥強度檢測邛2檢測出之收訊電場強度進行臨限值判 二！：訊電場強度高於電場強度臨限值之情形輸出判定 5孔遽到控制部6。 出之此自度臨限值叶算部4根據電場強度檢測部2檢測 限值設定於電場強痒 艮值，並將電場強度臨 ;電场強度臨限值判定部3。 制：部5從收訊㈣1輸出之接收訊號檢測出下傳控 制並進行解調動作，控制部6則控制各部動作。 接著，參考圖4來說明本實 強度臨限值設定動作。ffl :動° 10之電~ 動作之時序圖。 、說月圖1所示之行動台10 圖4中，（a)所示為基地台 3l，（b)所干丨1 — 1發送之下傳控制訊號 不為基地台H-2發送之下傳控制訊號32，(c) 10 1309929 土所:為基地台11_3發送之下傳控制訊號33，（d)所示為基 地。11-4發送之下傳控制訊號34,（e)所示為行動台μ 收訊之接收訊號之收訊電場強度4卜如圖4所示，基地台 11 一1發送下傳控制訊號31，不久後基地台U_2發送下^ 控制訊號32 ’再不久基地台1"發送下傳控制訊號33, 再過不久基地台u_4發送下傳控制訊號，其結果，存 在下傳控制訊號重疊之期間。degree. Further, the console 12 of Fig. 2 accommodates a plurality of radio base stations (hereinafter referred to as "base stations") 11-1 to η. In the first step, the RF unit 1 receives the signal of the predetermined wireless channel, and the power: the intensity detecting unit 2 detects the reception of the received signal of the receiving RF unit, the received signal, the intensity, the electric field strength, and the electric field strength. The threshold value is 2 for the detection electric field strength detected by the second wheat strength test 邛2! When the electric field strength is higher than the electric field strength threshold value, the output is judged to be 5 holes to the control unit 6. The self-degree threshold value calculating unit 4 sets the detection limit value of the electric field intensity detecting unit 2 to the electric field strong itching value, and the electric field intensity is applied to the electric field intensity threshold value determining unit 3. The system 5 detects the downlink control from the reception signal outputted by the reception (4) 1 and performs the demodulation operation, and the control unit 6 controls the operations of the respective units. Next, the actual intensity threshold setting operation will be described with reference to Fig. 4 . Ffl: The timing chart of the action of the 10 ° electric ~ action. In the mobile station 10 shown in Figure 1, Figure 4, (a) shows the base station 3l, (b) the dry 1-1 transmission downlink control signal is not sent under the base station H-2 Transmission control signal 32, (c) 10 1309929 Local office: Send the downlink control signal 33 for the base station 11_3, and the base is shown in (d). 11-4 transmits a downlink control signal 34, and (e) shows a receiving electric field strength 4 of the receiving signal of the mobile station μ receiving. As shown in FIG. 4, the base station 11-1 transmits a downlink control signal 31. Soon after, the base station U_2 sends a control signal 32' and then the base station 1" transmits the downlink control signal 33, and then the base station u_4 transmits the downlink control signal. As a result, there is a period in which the downlink control signals overlap.
首先，收訊初期狀態中， 未設定電場強度臨限值（時刻 判定部3不進行臨限值判定。 電場強度臨限值判定部3並 tl)，因此，電場強度臨限值 接著’收訊狀部！接收基地台發送之下傳控制 訊號31(時刻t2)，電場強度檢測部2檢測出收訊電場強 度並輸出至電場強度臨限值計算冑4，電場強度臨限值計 算部4在收訊電場強度加上臨限值增加量“（既定值）而算 出電場強度臨限值Thl。接著，將算 T, t 异之電％強度臨限值First, in the initial state of reception, the electric field intensity threshold is not set (the time determination unit 3 does not perform the threshold determination. The electric field strength threshold value determination unit 3 and t1), and therefore, the electric field intensity threshold is followed by 'reception Shape! The receiving base station transmits the downlink control signal 31 (time t2), the electric field strength detecting unit 2 detects the received electric field strength and outputs it to the electric field intensity threshold calculation 胄4, and the electric field intensity threshold calculating unit 4 receives the electric field. The intensity plus the threshold increase "(established value) is used to calculate the electric field strength threshold Th1. Next, the T, t different power % intensity threshold is calculated.
Thl設定於電場強度臨限值判 ^ ^ σ 又，在收訊初期狀 先、下接收最初之下傳控制訊號之時間 、 叮u點解調部5使用最 初之下傳控制訊號31開始同步建立動作。 接著，收訊RF部1接收基地台丨 口 11 2發运之下傳控制 sfl號3 2 (時刻13 )，此時，雷揚強许 強度臨限值判定部3使用 電場強度臨限值Thl進行臨限值判定。 J疋相對於上個接收之 下傳控制訊號31之收訊電場強度， 电臂強度臨限值 雨出臨限值增加量α。因此，相對於 ,,^ 卜得控制矾號31之 收訊電場強度，當下傳控制訊號32 之收訊電場強度高出 1309929 ::限二增加量…之情形，臨限值判定為合格。 相對於下傳控制訊號31之收訊電場強 訊號32之收訊電埸強产虻去丄山故 又下傳控制 ㈣# 而出臨限值增加量α以上， =限值判定為不合格。因此，電場強度臨限值判定 =判定訊號，控制部6繼續維持解調部5之動作。所碑 口格係指，根據臨限值判定處理 月 訊雷π改# ^ 州疋出下傳控制訊號之收 於電場強度臨限值的情形，採用該下傳控制 ^虎’收訊處理機構根據所採用之下傳控制訊號進行 建立。所謂不合格係指’根據臨限值判定處理判 =制訊號之收訊電場強度未高於電場強度臨限值㈣形， 收訊處理機構不根據該下傳控制訊號進行同步建立。 #收訊RF °"接收基地台U~3發送之下傳控制 ^ 33(時刻⑷，相對於下傳控制訊號31之收訊電場強 !，此下傳控制訊號33之收訊電場強度高出臨限值增加 处果^格因此冑用電场強度臨限值Thl之臨限值判定 ::果為“各，電場強度臨限值判定部3輸出判定訊號。控 制部6按照此判定訊號，輪出再開始訊號至解調部5。解工 調部5按照此再開始訊號’使用基地台n — 3發送 控制訊號33再開始同步建立動作。所謂合格係指，根據 臨限值判定處理判定出下傳控制訊號之收訊電場強度高於 :場強度臨限值的情形，㈣該下傳控制訊號，收訊處理 機構根據所採用之下傳控制訊號進行同步建立。 又，控制部6按照電場強度臨限值判定部3之判定气 號’對電場強度臨限值計算部4輪出指示其算出電場強度 12 1309929 心 不訊號。電場強度臨限值計算部4按照此 ^指示訊號，在下傳控制訊號…訊電場強度加上 L限值增加量α算出電場強度臨限值m。接下來， 場強度臨限值Th2設定於電場強度臨限值判定冑3 電場強度臨限值。 接著，收訊i接收基地台u_4發送之下傳 =號34(時刻t5)，相對於下傳控制訊號33之收訊電場強 =，此下傳控制訊號34之收訊電場強度高出臨限值增加 里α以上，因此，使用電場強度臨限值如之臨限值判定 結果為合格，電場強度臨限值判定部3輸出判定訊號。控 制部6按照此判定訊號’輸出再開始訊號至解調部5。解 凋部5按照此再開始訊號，使用基地台丨丨_4發送之下 控制訊號34 #開始同步建立動作。所謂合格係指， 臨限值判定處理判定出下傳控制訊號之收訊電場強度高於 電場強度臨限值的情形’採用該下傳控制訊號，收訊處理 機構根據所採用之下傳控制訊號進行同步建立。 又，控制部6按照電場強度臨限值判定部3之判定气 號，對電場強度臨限值計算部4輸出指示其算出電場強; 臨限值之算出指示訊號。電場強度臨限值_ 4按职： 异出指示訊號，在下傳控制訊號34 <收訊電場強度加上 臨限值增加量α算出電場強度臨限值m。接下來’將電 場強度臨限值Th3設定於電場強度臨限值判定冑3並更新 電場強度臨限值。 ’ 接者，基地台11-4發送之下傳控制訊號34之收訊結 13 1309929 束（時刻t6)，控制部6在下傳控制訊號34之收訊結束時， 對％場強度臨限值判定部3輸出使電場強度臨限值變無效 之無效訊號。電場強度臨限值判定部3按照此無效訊號， 將電場強度臨限值設為未設定，藉此回到收訊初期狀態。 如上述般，電场強度臨限值’係在上個接收之下傳控 制δΐΐ號之收訊電場強度加上臨限值增加量“。因此，藉由 使用此電場強度臨限值之臨限值判定’可將收訊電場強度 比上個接收之下傳控制訊號更高之訊號判定為有效且能 夠以高效率選擇收訊電場強度高之下傳控制訊號。 接著’說明該臨限值增加量α之決定方法。 事先決定臨限值增加量α並記憶於電場強度臨限值計 算部4。臨限值增加量α之決定方法，以著眼於能更有效 進行臨限值判定為佳，具體來說，以可滿足（丨）式關係的 方式來決定臨限值增加量α之值。 較高收訊電場強度/較低收訊電場強度> α…（丄） 此α係使用能確保實用上無問題之錯誤率之c丨R。此 值可根據行動通訊系統之環境條件與實測值等來決定。 上記（1)式可改寫成 較高收訊電場強度 > 較低收訊電場強度χ α…（2) 再對（2)式兩邊取對數可改寫成 1 og(收§fl電場強度較高值）> 1 〇g(收訊電場強度較低值 X α ) =1 og (收讯電場強度較高值）> 丨〇g (收訊電場強度較低 值）+ log α 14 1309929 =收訊電場強度較高值（dB;分貝）> 收訊電場強度較 低值（dB)+ a (dB) · · · (3) 即，設上個接收之下傳控制訊號之收訊電場強度為較 低收訊電場強度UB)，則加上臨限值增加量a(dB)後之值 成為新電場強度臨限值⑽。只要是收訊電場強度比該電 %強度臨限值（dB)更高之下傳控制訊號，即使和上個接收 之訊號重疊，仍可得到能確保實用上無問題錯誤率之’ 且確保通訊品質。據此，可高效率選擇實用上無問題且收 訊電場強度更高之下傳控制訊號。 接著，參考圖5，說明本實施型態之行動台1〇之下傳 控制訊號收訊動作。圖5係^ !所示之行動台1〇之處理 流程圖。 行動台10進入收訊動作後開始圖5之處理。首先，在 步驟S卜控制部6指示解調部5開始解調，據此，解調部Thl is set in the electric field strength threshold value ^^ σ, and the time when the first control signal is transmitted first and the next at the initial stage of reception, and the demodulation unit 5 starts to synchronize with the first transmission control signal 31. action. Next, the receiving RF unit 1 receives the base station port 11 2 and transmits the downward transmission control sfl number 3 2 (time 13). At this time, the Rayleigh strength intensity threshold value determining unit 3 uses the electric field intensity threshold Thl. The threshold value is determined. J疋 is relative to the received electric field strength of the last received downlink control signal 31, and the arm strength threshold is increased by the rain margin. Therefore, relative to , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Compared with the receiving electric field signal of the downlink control signal 31, the receiving signal of the signal 32 is strong, and the output of the signal is increased to 丄 故 故 故 故 又 又 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( Therefore, the electric field strength threshold value determination = determination signal, and the control unit 6 continues to maintain the operation of the demodulation unit 5. The word of the mouth refers to the case where the threshold is determined according to the threshold value, and the state of the output control signal is received at the threshold of the electric field strength. It is established according to the adopted control signal. The term "failure" means that the receiving electric field strength of the system signal is not higher than the electric field strength threshold (4) according to the threshold determination processing, and the receiving processing mechanism does not perform synchronization establishment based on the downlink control signal. #收讯RF °"Receiving base station U~3 transmits the downlink control ^ 33 (time (4), compared with the receiving electric field of the downlink control signal 31! The receiving electric field strength of the downlink control signal 33 is high Therefore, the threshold value is increased. Therefore, the electric field strength threshold value determining unit 3 outputs a determination signal. The control unit 6 determines the signal according to this. , the re-start signal is taken to the demodulation unit 5. The re-transmission unit 5 starts the synchronization establishment operation according to the restart signal 'Using the base station n-3 to transmit the control signal 33. The so-called qualified system refers to the threshold determination processing. Determining that the received electric field strength of the downlink control signal is higher than: the field strength threshold, (4) the downlink control signal, and the receiving processing mechanism is synchronously established according to the used downlink control signal. Further, the control unit 6 The electric field strength threshold calculation unit 4 instructs the electric field strength threshold calculation unit 4 to calculate the electric field strength 12 1309929, and the electric field strength threshold calculation unit 4 follows the indication signal according to the judgment signal number. Under the control signal... The electric field strength plus the L limit increase amount α is used to calculate the electric field strength threshold m. Next, the field strength threshold Th2 is set to the electric field strength threshold value 胄3 electric field strength threshold. Next, the reception i receives The base station u_4 transmits the lower pass number 34 (time t5), and the received electric field strength relative to the downlink control signal 33=, the received electric field strength of the downlink control signal 34 is higher than the threshold value by more than α, Therefore, the electric field strength threshold value is passed as the threshold value determination result is acceptable, and the electric field strength threshold value determining unit 3 outputs the determination signal. The control unit 6 outputs the restart signal to the demodulation unit 5 in accordance with the determination signal. In accordance with the restart signal, the unit 5 starts the synchronization establishment operation by using the base station 丨丨4 to transmit the control signal 34. The so-called qualification means that the threshold value determination process determines that the received electric field strength of the downlink control signal is higher than In the case where the electric field strength is limited, the downlink control signal is used, and the receiving processing unit performs synchronization establishment based on the used transmission control signal. Further, the control unit 6 determines the air number according to the electric field strength threshold value determining unit 3. The electric field strength threshold calculation unit 4 outputs an instruction indicating that the electric field strength is calculated; the threshold value is calculated. The electric field strength threshold _ 4 is used: the output indication signal is transmitted under the control signal 34 < the received electric field strength plus The upper limit value increase amount α is used to calculate the electric field intensity threshold m. Next, 'the electric field strength threshold value Th3 is set to the electric field intensity threshold value 胄3 and the electric field strength threshold value is updated. 'Acceptor, base station 11 -4 transmits the reception node 13 1309929 bundle of the control signal 34 (time t6), and the control unit 6 outputs the electric field strength to the % field strength threshold value determining unit 3 when the reception of the downlink control signal 34 ends. The invalidation signal whose limit value becomes invalid. The electric field strength threshold determination unit 3 returns the electric field intensity threshold to the unreset according to the invalid signal, thereby returning to the initial state of reception. As described above, the electric field intensity threshold 'is the transmission field strength of the control δ 加上 plus the threshold increase amount under the last reception. Therefore, by using the threshold of the electric field strength threshold The value judgment 'determines that the signal of the received electric field strength is higher than the last received control signal is valid and can select the transmission electric field with high efficiency to transmit the control signal with high efficiency. Then 'state the increase of the threshold The method of determining the amount α is determined in advance and stored in the electric field strength threshold calculating unit 4. The method of determining the threshold increasing amount α is preferably performed in such a manner that the threshold value can be more effectively determined. Specifically, the value of the threshold increase amount α is determined in a manner that satisfies the (丨) relationship. Higher received electric field strength / lower received electric field strength > α... (丄) This α is used Ensure the practical error-free error rate c丨R. This value can be determined according to the environmental conditions and measured values of the mobile communication system. The above formula (1) can be rewritten to higher receiving electric field strength> lower reception Electric field strength χ α...(2) 2) The logarithm of both sides can be rewritten as 1 og (the higher the electric field strength is) 1g (the lower value of the received electric field strength X α ) =1 og (the higher value of the received electric field strength) > ; 丨〇g (lower received electric field strength) + log α 14 1309929 = higher value of received electric field strength (dB; decibel) > lower value of received electric field strength (dB) + a (dB) · (3) That is, if the receiving electric field strength of the last receiving transmission control signal is the lower receiving electric field strength UB), then the value of the threshold increasing amount a (dB) becomes the new electric field strength. Limit value (10). As long as the receiving electric field strength is higher than the electric power intensity threshold (dB), the control signal can be obtained, even if it overlaps with the last received signal, it can obtain a practical problem-free error rate. 'And ensure the quality of communication. According to this, it is possible to select the control signal with high efficiency and the higher the strength of the received electric field. Next, with reference to Fig. 5, the control of the mobile station of this embodiment will be described. Signal receiving action. Figure 5 is a flow chart of the processing of the mobile station shown in Figure 1. The mobile station 10 enters the receiving action and starts Figure 5. Process. First, the control unit BU at step S 6 indicating demodulation unit 5 to start the demodulation, whereby the demodulation unit
=開始解調動作。χ，電場強度檢測部2開始檢測收訊RF 部1收訊之接收訊號之收訊電場強度。 接著在步驟S2，判定收訊是否結束，收訊未結束進 到步驟S3，收訊結束則結束圖5之處理。 著在步驟S 3，解調部5從接收訊號檢測出下傳控 制汛號之位凡同步用訊號2丨後，輸出位元同步用訊號檢 :出訊號到控制部6,控制·"按照位元同步用訊號：測 汛號輸出叶算指示訊號到電場強度臨限值計算部4。另 —方面二未檢測出位元同步用訊號21的情形回到步驟犯。 接者，在步驟S4，電場強度臨限值計算部4按照控制 15 1309929 部6之計算指示訊號，加上臨限值増加量α於電場強度檢 測部2檢測出之收訊電場強度’算出電場強度臨限值，且 設定於電場強度臨限值判定部3。 接著，在步驟S5 ,解調部5從接收訊號檢測出下傳控 制訊號之幀同步用訊號22後，輪出幀同步用訊號檢測出 訊號到控制部6，控制部6根據幀同步用訊號檢測出訊號 決定收訊結束時點（S6)。又，控制部6按照幀同步用訊號 檢測出訊號輸出判定開始訊號到電場強度臨限值判定部 3。另一方面，未檢測出幀同步用訊號22的情形回到步驟 S2 ° 接著，在步驟S7，電場強度臨限值判定部3將電場強 度檢测。卩2檢測出之收訊電場強度與電場強度臨限值比 較八果，若收訊電場強度高於電場強度臨限值（S7、 YES)，=場強度臨限值判定# 3輸出判定訊號。控制部6 按照判^訊號輸出再開始訊號到解調冑5，再開始解調部 5之同步建立動作（回到步驟S3)。 另方面，右收訊電場強度未高於電場強度臨限值 (S7、N0) ’在步驟S8，控制部6判定是否為收訊結束時點。 其結果’若是收訊結束時點進到步驟S9，若非收訊結束時 點回到步驟S 7。 立接者，在步驟S9，由於下傳控制訊號之收訊結束，控 制15 6輪出無效訊號到電場強度臨限值判定 度臨限值判宕郫q从 电嘴涵 ^ ^ σ 知照無效訊號，將電場強度臨限值設為 未°又疋。據此，回到步驟S2。 16 1309929 又，圖5之處理流程中，雖是在檢測出位元同步用訊 號後開始算出電場強度臨限值，但亦可在檢測出幀同步用 訊號後開始算出電場強度臨限值。檢測出位元同步用訊號 後開始算出電場強度臨限值之情形，係從開始接收下傳控 制訊號之時間點開始算出電場強度臨限值，故可提升臨限 值之算出精度。另一方面，檢測出幀同步用訊號後開始算 出電場強度臨限值之情形，可縮短算出時間得到減低消耗 電力之效果。 依據本實施型態，根據無線收訊之接收訊號之收訊電 場強度算出電場強度臨限值，從使用此電場強度臨限值進 行臨限值判定的結果判斷接收訊號之有效性，據此，可藉 由臨限值判疋從複數個無線基地台發送之下傳控制訊號中 以高效率選擇收訊電場強度較高之訊號。 以上’雖參考圖式詳述本發明之實施型態，但其具體 構成並不限於此實施型態，可包含不脫離本發明要旨範圍 之各種設計變更等。 例如，上述實施型態係以TMA方式之行動通訊系統為 例說明’本發明不限定於TMA方式，可適用於各種無線 通訊方式。 【圖式簡單說明】 圖1係顯示本發明一實施型態之無線行動台1 〇之收訊 系統之方塊圖。 圖2係顯示行動通訊系統一構成例之方塊圖。 圖3係下傳控制訊號之構成圖。 17 1309929 圖4係說明圖1所示無線行動台1 0之動作之時序圖。 圖5係圖1所示之無線行動台1 0之處理流程圖。 【主要元件符號說明】 1 收訊RF部 2 電場強度檢測部 3 電場強度臨限值判定部 4 電場強度臨限值計算部 5 解調部 6 控制部 10 無線行動台 11 -1〜η 無線基地台 12 控制台 21 位元同步用訊號 22 幀同步用訊號 2 3 貧料訊號 24 錯誤檢測訊號 31' 32' 33' 34 下傳控制訊號 41 收訊電場強度 18= Start demodulation action. Then, the electric field strength detecting unit 2 starts detecting the strength of the receiving electric field of the received signal received by the receiving RF unit 1. Next, in step S2, it is judged whether or not the reception is completed, the reception is not completed, and the process proceeds to step S3, and when the reception is completed, the processing of Fig. 5 is ended. In step S3, the demodulation unit 5 detects the position of the downlink control signal from the received signal, and then outputs the bit synchronization signal detection: the signal is sent to the control unit 6, and the control is followed. The bit synchronization signal: the measurement number output leaf calculation instruction signal to the electric field intensity threshold calculation unit 4. On the other hand, the situation in which the bit synchronization signal 21 is not detected is returned to the step. Then, in step S4, the electric field intensity threshold calculating unit 4 calculates the electric field according to the calculation instruction signal of the control unit 15 1309929, and the threshold value α adding amount α to the electric field strength detected by the electric field intensity detecting unit 2 The intensity threshold is set to the electric field strength threshold value determining unit 3. Next, in step S5, the demodulation unit 5 detects the frame synchronization signal 22 of the downlink control signal from the reception signal, and then rotates the frame synchronization signal to detect the signal to the control unit 6, and the control unit 6 detects the signal according to the frame synchronization. The signal number determines the end of the reception (S6). Further, the control unit 6 detects the signal output determination start signal to the electric field intensity threshold value determining unit 3 in accordance with the frame synchronization signal. On the other hand, if the frame synchronization signal 22 is not detected, the process returns to step S2. Next, in step S7, the electric field intensity threshold determining unit 3 detects the electric field intensity.收2 The detected electric field strength and the electric field strength threshold are compared with the eight fruits. If the received electric field strength is higher than the electric field strength threshold (S7, YES), the field strength threshold value #3 outputs the decision signal. The control unit 6 outputs a restart signal to the demodulation 胄5 in accordance with the judgment signal, and starts the synchronization establishment operation of the demodulation unit 5 (returning to step S3). On the other hand, the right-receiving electric field strength is not higher than the electric field strength threshold (S7, N0)'. In step S8, the control unit 6 determines whether or not it is the end of the reception. As a result, if the reception is completed, the process proceeds to step S9, and if the reception is not completed, the process returns to step S7. The splicer, in step S9, because the reception of the downlink control signal is ended, the control 15 6 turns out the invalid signal to the electric field strength threshold determination threshold value 宕郫q from the electric nozzle han ^ ^ σ informed invalid signal , the electric field strength threshold is set to not ° and 疋. Accordingly, the process returns to step S2. 16 1309929 In the processing flow of FIG. 5, although the electric field intensity threshold is calculated after detecting the bit synchronization signal, the electric field intensity threshold may be calculated after detecting the frame synchronization signal. When the signal for synchronizing the bit is detected and the electric field intensity threshold is calculated, the electric field intensity threshold is calculated from the time when the down control signal is received, so that the accuracy of the threshold value can be improved. On the other hand, when the frame synchronization signal is detected and the electric field intensity threshold is calculated, the calculation time can be shortened to reduce the power consumption. According to the embodiment, the electric field intensity threshold is calculated according to the received electric field strength of the received signal of the wireless reception, and the validity of the received signal is determined from the result of using the electric field strength threshold to determine the threshold value, according to which The signal can be selected from a plurality of wireless base stations by a threshold to efficiently select a signal with a high strength of the received electric field. The above embodiments are described in detail with reference to the drawings, but the specific configuration is not limited to the embodiment, and various design changes and the like without departing from the scope of the invention may be included. For example, the above-described embodiment is described by taking a TMA mobile communication system as an example. The present invention is not limited to the TMA method and can be applied to various wireless communication methods. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing a receiving system of a wireless mobile station 1 according to an embodiment of the present invention. Fig. 2 is a block diagram showing a configuration example of the mobile communication system. Figure 3 is a block diagram of the downlink control signal. 17 1309929 FIG. 4 is a timing chart illustrating the operation of the wireless mobile station 10 shown in FIG. 1. FIG. 5 is a flowchart of processing of the wireless mobile station 10 shown in FIG. 1. [Description of main component symbols] 1 Receiver RF unit 2 Electric field strength detecting unit 3 Electric field strength threshold value determining unit 4 Electric field strength threshold calculating unit 5 Demodulation unit 6 Control unit 10 Wireless mobile station 11 -1 to η Wireless base Station 12 console 21-bit sync signal 22 frame sync signal 2 3 poor signal 24 error detection signal 31' 32' 33' 34 downlink control signal 41 receiving electric field strength 18