TWI536864B - A Method of Interference Coordination of Energy Efficiency in Heterogeneous Network with Near Space - Google Patents
A Method of Interference Coordination of Energy Efficiency in Heterogeneous Network with Near Space Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
本發明是有關於一種通訊干擾協調方法，特別是有關於一種利用近空子訊框於異質網路具能量效益之干擾協調方法。 The present invention relates to a communication interference coordination method, and more particularly to an interference coordination method for utilizing a near null subframe for energy efficiency in a heterogeneous network.
由於行動通訊技術近年來快速發展，無論使用者位於何處，都可提供許多通訊服務，例如語音通訊服務、資料傳輸服務以及視頻通訊服務等。大部分的行動通訊系統為多重存取系統，其中無線網路資源可被多重配置給複數使用者。由行動通訊系統所採用之多重存取技術包括1x分碼多重存取2000(1x code division multiple access，1x CDMA 2000)技術、1x演進資料最佳化(1x Evolution-Data Optimized，1x EVDO)技術、正交分頻多工(Orthogonal Frequency Division Multiplexing，OFDM)技術、以及長時間演進(Long Term Evolution，LTE)技術。此外，先進長期演進技術(Long Term Evolution Advanced，LTE-A)為根據長期演進技術標準發展出的加強版技術。先進長期演進技術必須相容於根據長期演進技術製造的設備，並且必須與長期演進技術通訊系統共用頻帶。 Due to the rapid development of mobile communication technology in recent years, many communication services such as voice communication services, data transmission services and video communication services can be provided no matter where the user is located. Most mobile communication systems are multiple access systems in which wireless network resources can be configured multiple times for multiple users. The multiple access technologies used by mobile communication systems include 1x code division multiple access (1x CDMA 2000) technology and 1x Evolution-Data Optimized (1x EVDO) technology. Orthogonal Frequency Division Multiplexing (OFDM) technology and Long Term Evolution (LTE) technology. In addition, Long Term Evolution Advanced (LTE-A) is an enhanced version of the technology developed according to the long-term evolution technology standard. Advanced Long Term Evolution technology must be compatible with devices manufactured according to Long Term Evolution technology and must share frequency bands with Long Term Evolution technology communication systems.
利用高功率大型基地台(Macro eNB)(簡稱大基地台)，與低功率微型(Pico eNB)/超微型基地台(Femto eNB)(簡稱小基地台)混合佈建的網路架構，被稱作異質網路(Heterogeneous Network，HetNet)。在異質網路中，高功率與低功率基地台間會產生同頻干擾問題，特別是大基地台會對小基地台的使用者造成干擾，而許多方法能夠降低或消除此干擾，例如，LTE-A提出了增強型細胞間干擾協調(Enhanced Intercell Interference Coordination，eICIC)的機制，透過近空子訊框(Almost Blank Subframe，ABS)的設計，讓鄰近基地台協調不傳送資料的子訊框，以減少干擾。然而，雖然透過近空子訊框能有效降低此干擾，但固定比例的近空子訊框，在降低對小基地台使 用者的干擾同時，會讓大基地台使用者的效能下降。 A high-power large base station (Macro eNB) (referred to as a large base station), and a low-power micro (Pico eNB) / ultra-micro base station (Femto eNB) (referred to as small base station) mixed network architecture, is called Heterogeneous Network (HetNet). In a heterogeneous network, co-channel interference occurs between high-power and low-power base stations. In particular, large base stations can cause interference to users of small base stations, and many methods can reduce or eliminate such interference, for example, LTE. -A proposes an enhanced Intercell Interference Coordination (eICIC) mechanism, which allows adjacent base stations to coordinate the sub-frames that do not transmit data through the design of the Almost Blank Subframe (ABS). Reduce interference. However, although the interference can be effectively reduced by the near-space sub-frame, a fixed ratio of near-empty sub-frames is reduced to the small base station. At the same time, the user's interference will reduce the performance of the large base station users.
有鑑於上述習知技藝之問題，本發明之目的就是在提供一種利用近空子訊框於異質網路具能量效益之干擾協調法，以解決基地台間之干擾並可確保各基地台使用端之使用效能。 In view of the above-mentioned problems of the prior art, the object of the present invention is to provide an interference coordination method for utilizing near-empty sub-frames in a heterogeneous network to solve interference between base stations and ensure the use of each base station. Use performance.
根據本發明之目的，提出一種利用近空子訊框於異質網路具能量效益之干擾協調方法，適用於包含有多個大基地台及小基地台之通訊系統，此方法包含下列步驟：透過一中央控制器依據分別使用大基地台及小基地台之各使用者設備之一信號與干擾噪聲比，來計算出各個使用者設備受到干擾之吞吐量與未受到干擾之吞吐量；藉由中央控制器分別計算各個使用者設備受到干擾之吞吐量與未受到干擾之吞吐量之一干擾差異值；藉由中央控制器依據各個使用者設備未受到干擾之吞吐量及干擾差異值，計算出系統目前所使用一特定百分比之近空白子訊框之訊框格式之一總吞吐量能源效益加權值；每經過一週期時間後，藉由中央控制器再次計算目前具特定百分比之近空白子訊框之訊框格式之總吞吐量能源效益加權值，並計算具有將特定百分比增加一固定百分比後之近空白子訊框之訊框格式之總吞吐量能源效益加權值，且當特定百分比不為0%時，則進一步計算具有將特定百分比減少固定百分比後之近空白子訊框之訊框格式之總吞吐量能源效益加權值；以及藉由中央控制器比對上述二個或三個所計算出之總吞吐量能源效益加權值，使系統使用上述二個或三個中最大之總吞吐量能源效益加權值所對應之訊框格式。 In accordance with the purpose of the present invention, an energy-efficient interference coordination method using a near-empty subframe for a heterogeneous network is proposed, which is applicable to a communication system including a plurality of large base stations and small base stations. The method includes the following steps: The central controller calculates the interference throughput and the undisturbed throughput of each user equipment according to the signal to interference and noise ratio of each user equipment of the large base station and the small base station, respectively; The device calculates the interference difference value of the throughput of each user equipment that is interfered with and the interference that is not interfered with; the central controller calculates the current system based on the throughput and interference difference values of each user equipment that are not interfered with. The total throughput energy efficiency weighting value of one of the frame formats of the near blank header frame used; after each cycle time, the central controller again calculates the current blank frame with a certain percentage The total throughput energy efficiency weighted value of the frame format, and the calculation has a fixed percentage increase of a certain percentage The total throughput energy efficiency weighting value of the frame format of the near blank sub-frame, and when the specific percentage is not 0%, further calculate the frame format of the near blank sub-frame with a fixed percentage reduction by a certain percentage The total throughput energy efficiency weighting value; and the total throughput energy benefit weight calculated by the central controller comparing the two or three of the above, so that the system uses the largest total throughput energy of the two or three The frame format corresponding to the benefit weighting value.
較佳地，當中央控制器首次計算之總吞吐量能源效益加權值所對應之訊框格式使用近空白子訊框之特定百分比為0%時，表示系統當時之訊框無使用近空白子訊框。 Preferably, when the specific percentage of the frame format corresponding to the total throughput energy benefit weight value calculated by the central controller for the first time uses 0% of the near blank frame, it indicates that the system does not use the blank message at the time. frame.
較佳地，本方法更包含下列步驟：利用中央控制器以數值大小來排序所有之干擾差異值。其中，當系統使用具特定百分比之近空白子訊框之訊框格式時，中央控制器係挑選數值排序較大，並排列在特定百分比之前之干擾差異值來做近空白子訊框；當系統使用具特定百分比增加一固定百分比後之近空白子訊框之訊框格式時，中央控制器係挑選數值排序 較大，並排列在特定百分比增加一固定百分比之前之干擾差異值來做近空白子訊框；當系統使用具特定百分比減少一固定百分比後之近空白子訊框之訊框格式時，中央控制器係挑選數值排序較大，並排列在特定百分比減少一固定百分比之前之干擾差異值來做近空白子訊框。其中，當特定百分比為0%，或特定百分比減去固定百分比後為0%時，中央控制器係挑選數值排序較大，並排列在固定百分比之前之干擾差異值來做近空白子訊框。 Preferably, the method further comprises the step of: sorting all the interference difference values by a numerical controller using a central controller. Wherein, when the system uses the frame format of a certain percentage of the near blank sub-frame, the central controller selects the interference difference value which is ranked by a large percentage and arranges the interference difference value before the specific percentage to make the near blank sub-frame; The central controller picks up the numerical order when using a frame format of a near blank frame with a certain percentage increasing by a fixed percentage Larger, and arrange the interference difference value before a certain percentage increase by a fixed percentage to make a near blank sub-frame; when the system uses a frame format of a near blank sub-frame with a certain percentage reduction by a fixed percentage, the central control The system selects a larger numerical order and arranges the interference difference value before a certain percentage is reduced by a fixed percentage to make a near blank sub-frame. Wherein, when the specific percentage is 0%, or the specific percentage is 0% after subtracting the fixed percentage, the central controller selects the interference difference value before the fixed percentage to make the near blank subframe.
較佳地，本方法更包含下列步驟：透過中央控制器接收分別使用大基地台及小基地台之使用者設備之信號強度及干擾信號強度，並依據空中介面之熱雜訊計算出各個使用者設備之信號與干擾噪聲比。 Preferably, the method further comprises the steps of: receiving signal strength and interference signal strength of the user equipments respectively using the large base station and the small base station through the central controller, and calculating each user according to the hot noise of the empty intermediate plane The signal to interference noise ratio of the device.
較佳地，本方法更包含下列步驟：經由中央控制器依據使用小基地台之各使用者設備之未受到干擾之吞吐量及干擾差異值計算出所有小基地台之一第一總吞吐量，及依據使用大基地台之各使用者設備之未受到干擾之吞吐量及干擾差異值計算出所有大基地台之第二總吞吐量，進而依據第一總吞吐量及第二總吞吐量計算出總吞吐量能源效益加權值。 Preferably, the method further comprises the steps of: calculating, by the central controller, the first total throughput of all the small base stations according to the undisturbed throughput and interference difference values of the user equipments using the small base station, Calculating the second total throughput of all the large base stations based on the undisturbed throughput and interference difference values of the user equipments of the large base station, and calculating the first total throughput and the second total throughput. Total throughput energy benefit weighting.
較佳地，本方法更包含下列步驟：經由中央控制器依據第一總吞吐量及第二總吞吐量計算出所有使用者設備於每個子訊框裡之一加總吞吐量；以及利用中央控制器依據加總吞吐量、子訊框在使用模式下系統之一能源效益、系統之一最大吞吐量及系統之一最大能源效益，計算出目前所使用特定百分比之近空白子訊框之訊框格式之總吞吐量能源效益加權值。 Preferably, the method further comprises the steps of: calculating, by the central controller, the total throughput of all user equipments in each subframe according to the first total throughput and the second total throughput; and using central control Based on the aggregate throughput, one of the energy efficiency of the system in the usage mode, one of the maximum throughput of the system, and one of the maximum energy efficiency of the system, the frame of the near-blank sub-frame currently used is calculated. The total throughput energy efficiency weighting of the format.
較佳地，週期時間可為20ms。 Preferably, the cycle time can be 20 ms.
較佳地，固定百分比可為12.5%。 Preferably, the fixed percentage can be 12.5%.
承上所述，本發明之利用近空子訊框於異質網路具能量效益之干擾協調方法，可利用干擾感知適應性技術來動態調整使用近空子訊框的比例，除了可降低來自其大基地台對小基地台使用者的干擾之外，更可確保大基地台使用者的效能，還可以減少基地台的電力使用。 As described above, the present invention utilizes an energy-efficient interference coordination method for a near-space frame in a heterogeneous network, and can utilize an interference-aware adaptive technique to dynamically adjust the proportion of using near-space frames, in addition to reducing the base from its large base. In addition to the interference of the small base station users, the station can ensure the performance of the large base station users, and can also reduce the power usage of the base station.
S11~S12‧‧‧步驟 S11~S12‧‧‧Steps
macro cell‧‧‧大型基地台 Macro cell‧‧‧large base station
pico cell‧‧‧小型基地台 Pico cell‧‧‧small base station
time‧‧‧時間 Time‧‧‧ time
subframe‧‧‧子訊框 Subframe‧‧‧ subframe
第1圖 係為本發明之利用近空子訊框於異質網路具能量效益之干擾協 調方法之流程圖。 Figure 1 is an energy-efficient interference protocol for the use of near-space frames in heterogeneous networks. Flow chart of the tuning method.
第2圖 係為xt和yt標示近空白子訊框之實施例之示意圖。 Figure 2 is a schematic diagram of an embodiment of x t and y t indicating a near blank sub-frame.
為利 貴審查員瞭解本發明之技術特徵、內容與優點及其所能達成之功效，茲將本發明配合附圖，並以實施例之表達形式詳細說明如下，而其中所使用之圖式，其主旨僅為示意及輔助說明書之用，未必為本發明實施後之真實比例與精準配置，故不應就所附之圖式的比例與配置關係解讀、侷限本發明於實際實施上的權利範圍，合先敘明。 The technical features, contents, and advantages of the present invention, as well as the advantages thereof, can be understood by the present inventors, and the present invention will be described in detail with reference to the accompanying drawings. The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.
請參閱第1圖，其係為本發明之利用近空子訊框於異質網路具能量效益之干擾協調方法之流程圖，此方法適用於包含有多個大基地台及小基地台之通訊系統，其流程步驟為： Please refer to FIG. 1 , which is a flow chart of an energy-efficient interference coordination method for using a near-space frame in a heterogeneous network according to the present invention. The method is applicable to a communication system including a plurality of large base stations and small base stations. The process steps are:
步驟S11：透過一中央控制器依據分別使用大基地台及小基地台之各使用者設備之一信號與干擾噪聲比，來計算出各個使用者設備受到干擾之吞吐量與未受到干擾之吞吐量，其中各使用者設備將會傳送一或多個回授通道資訊，到各使用者設備所連接的大基地台或小基地台，並再將傳送到中央控制器，而該大基地台、小基地台信號或中央控制器之任一皆能從回授通道資訊中轉換取得該信號與干擾噪聲比。 Step S11: Calculate the interference throughput and undisturbed throughput of each user equipment by using a central controller according to the signal to interference and noise ratio of each user equipment of the large base station and the small base station. Each user equipment will transmit one or more feedback channel information to a large base station or a small base station to which each user equipment is connected, and then transmit to the central controller, and the large base station and small Any of the base station signals or the central controller can convert the feedback signal to the interference-to-noise ratio from the feedback channel information.
步驟S12：藉由中央控制器分別計算各個使用者設備受到干擾之吞吐量與未受到干擾之吞吐量之一干擾差異值。 Step S12: Calculate, by the central controller, the interference difference value of the throughput of each user equipment that is interfered with and the throughput that is not interfered.
步驟S13：藉由中央控制器依據各個使用者設備未受到干擾之吞吐量及干擾差異值，計算出系統目前所使用一特定百分比之近空白子訊框之訊框格式之一總吞吐量能源效益加權值。 Step S13: Calculating, by the central controller, a total throughput energy efficiency of a frame format of a certain percentage of the near blank frame according to the throughput and interference difference values of the user equipments that are not interfered with by the user equipment. Weighted value.
步驟S14：每經過一週期時間後，藉由中央控制器再次計算目前具特定百分比之近空白子訊框之訊框格式之總吞吐量能源效益加權值，並計算具有將特定百分比增加一固定百分比後之近空白子訊框之訊框格式之總吞吐量能源效益加權值，且當特定百分比不為0%時，則進一步計算具有將特定百分比減少固定百分比後之近空白子訊框之訊框格式之總吞吐量能源效益加權值。 Step S14: After each cycle time, the central controller again calculates the total throughput energy benefit weight value of the frame format of the current blank frame with a certain percentage, and calculates that the specific percentage is increased by a fixed percentage. The total throughput energy efficiency weighting value of the frame format of the near blank header frame, and when the specific percentage is not 0%, further calculate the frame with the near blank header frame after reducing the specific percentage by a fixed percentage The total throughput energy efficiency weighting of the format.
步驟S15：藉由中央控制器比對上述二個或三個所計算出之 總吞吐量能源效益加權值，使系統使用上述二個或三個中最大之總吞吐量能源效益加權值所對應之訊框格式。 Step S15: Calculating by comparing the two or three of the above by the central controller The total throughput energy efficiency weighting value allows the system to use the frame format corresponding to the largest total throughput energy benefit weighting of the two or three of the above.
上述中，當中央控制器首次計算之總吞吐量能源效益加權值所對應之訊框格式使用近空白子訊框之特定百分比為0%時，表示系統當時之訊框無使用近空白子訊框。 In the above, when the specific percentage of the frame format corresponding to the total throughput energy efficiency weighting value calculated by the central controller for the first time uses 0% of the near blank frame, it means that the system does not use the near blank frame. .
上述中，中央控制器將會以數值大小來排序所有之干擾差異值。其中，當系統使用具特定百分比之近空白子訊框之訊框格式時，中央控制器係挑選數值排序較大，並排列在特定百分比之前之干擾差異值來做近空白子訊框；當系統使用具特定百分比增加一固定百分比後之近空白子訊框之訊框格式時，中央控制器係挑選數值排序較大，並排列在特定百分比增加一固定百分比之前之干擾差異值來做近空白子訊框；當系統使用具特定百分比減少一固定百分比後之近空白子訊框之訊框格式時，中央控制器係挑選數值排序較大，並排列在特定百分比減少一固定百分比之前之干擾差異值來做近空白子訊框。其中，當特定百分比為0%，或特定百分比減去固定百分比後為0%時，中央控制器係挑選數值排序較大，並排列在固定百分比之前之干擾差異值來做近空白子訊框。 In the above, the central controller will sort all the interference difference values by the value. Wherein, when the system uses the frame format of a certain percentage of the near blank sub-frame, the central controller selects the interference difference value which is ranked by a large percentage and arranges the interference difference value before the specific percentage to make the near blank sub-frame; When using the frame format of a near blank frame with a certain percentage increase by a fixed percentage, the central controller selects the value sorted larger and arranges the interference difference value before a certain percentage increases by a fixed percentage to make a near blank. Frame; when the system uses a frame format of a near blank frame with a certain percentage reduction by a fixed percentage, the central controller picks the value of the larger order and arranges the interference difference value before a certain percentage decreases by a fixed percentage. Come to make a blank blank frame. Wherein, when the specific percentage is 0%, or the specific percentage is 0% after subtracting the fixed percentage, the central controller selects the interference difference value before the fixed percentage to make the near blank subframe.
上述中，本方法的流程還包含了：透過中央控制器接收分別使用大基地台及小基地台之使用者設備之信號強度及干擾信號強度，並依據空中介面之熱雜訊計算出各個使用者設備之信號與干擾噪聲比；經由中央控制器依據使用小基地台之各使用者設備之未受到干擾之吞吐量及干擾差異值計算出所有小基地台之一第一總吞吐量，及依據使用大基地台之各使用者設備之未受到干擾之吞吐量及干擾差異值計算出所有大基地台之第二總吞吐量；經由中央控制器依據第一總吞吐量及第二總吞吐量計算出所有使用者設備於每個子訊框裡之一加總吞吐量；以及利用中央控制器依據加總吞吐量、子訊框在使用模式下系統之一能源效益、系統之一最大吞吐量及系統之一最大能源效益，計算出目前所使用特定百分比之近空白子訊框之訊框格式之總吞吐量能源效益加權值。 In the above, the flow of the method further includes: receiving signal strength and interference signal strength of the user equipments respectively using the large base station and the small base station through the central controller, and calculating each user according to the hot noise of the empty intermediate plane The signal-to-interference-to-noise ratio of the device; the first total throughput of all the small base stations is calculated by the central controller according to the undisturbed throughput and interference difference values of the user equipments using the small base station, and according to the use Calculating the second total throughput of all large base stations for the undisturbed throughput and interference difference values of each user equipment of the large base station; calculating by the central controller according to the first total throughput and the second total throughput All user equipments add total throughput in one of each sub-frame; and use the central controller to increase the throughput, one of the system's energy efficiency in the sub-frame usage mode, one of the system's maximum throughput, and the system For a maximum energy benefit, calculate the total throughput energy benefit weighting of the frame format of the near-blank sub-frame currently used.
上述中，週期時間可為20ms，固定百分比可為12.5%，但不以此為限。 In the above, the cycle time may be 20 ms, and the fixed percentage may be 12.5%, but not limited thereto.
以下係藉由一實施例來說明本發明之技術。 The technology of the present invention will be described below by way of an embodiment.
假設有一個正交頻分多址(Orthogonal Frequency Division Multiple Access，OFDMA)的通訊系統，其具有L個大型基站Macro，每個Macro裡面有3個大型基地台Macro cell和N個小型基地台Pico cell，M1和R1分別代表每個大型基地台範圍內的使用者設備個數和小型基地台的使用者設備個數，依薛南容量公式(Shannon capacity formula)定義：
：為macro使用者設備沒有遭受pico干擾的吞吐量(bps)。 : The throughput (bps) for the macro user device without pico interference.
：為pico使用者設備遭受相鄰macro和pico干擾的吞吐量(bps)。 : The throughput (bps) that the pico user device suffers from adjacent macro and pico interference.
：為pico使用者設備沒有遭受相鄰macro干擾的吞吐量(bps)。 : The throughput (bps) for the pico user device without suffering from adjacent macro interference.
接下來定義x t 和y t ，其分別為大型基地台macro cell和小型基地台pico cell在時間time(t)是否傳送資料及資料用資源區塊比例，1 x t 0，1 y t 0，0為不使用該子訊框subframe傳送資料，1則是該子訊框subframe全部用於傳送資料，如第2圖所示。 Next, x t and y t are defined, which are respectively the ratio of the large base station macro cell and the small base station pico cell transmitting data and data resource blocks at time time(t), 1 x t 0,1 y t 0, 0 is not used to transmit data in the subframe frame, and 1 is that the subframe frame is used to transmit data, as shown in Figure 2.
接著，經由中央控制器計算NL個小型基地台pico cell的第一總吞吐量為：；其中， 為干擾差異值。 Then, the first total throughput of the NL small base station pico cells is calculated via the central controller: ;among them, To interfere with the difference value.
計算3L個大型基地台Macro cell的第二總吞吐量為： ；其中， 為干擾差異值。 Calculate the second total throughput of 3L large base station Macro cells: ;among them, To interfere with the difference value.
接著，中央控制器計算純量。其中，V t 為所有使用者在每個子訊框裡的加總吞吐量；A與B中之元素皆0，，。 Then, the central controller calculates the scalar quantity . Where V t is the total throughput of all users in each sub-frame; the elements in both A and B are 0, , .
再接著，中央控制器計算系統目前所使用一特定百分比之近空白子訊框之訊框格式之一總吞吐量能源效益加權值z t =αV t /V MAX +βE t /E MAX 。其中，E t 為t時間子訊框subframe使用模式下系統的能源效益，V MAX 與E MAX 分別為記錄的系統的最大吞吐量與最大能源效益，定義為V MAX /P MAX ，P MAX 為記錄的系統網路最大功耗，因此可設計x t 來最大化z t 得到兼顧容量與能源效益的演算法，α、β為加權值，1 α 0，1 β 0，兩者不會同時為0，α及β分別用以調整系統的吞吐量和能源效益在選擇近空子訊框時的權重。 Then, the central controller calculates a total throughput energy benefit weighting value z t = αV t / V MAX + βE t / E MAX of a frame format of a certain percentage of the near blank subframe. Where E t is the energy efficiency of the system in the t-time sub-frame sub-frame usage mode, V MAX and E MAX are respectively the maximum throughput and maximum energy benefit of the recorded system, defined as V MAX / P MAX , P MAX is the record The maximum power consumption of the system network, so you can design x t to maximize z t to get capacity and energy efficiency algorithms, α , β are weighted, 1 α 0,1 β 0, the two will not be 0 at the same time, α and β are used to adjust the weight of the system's throughput and energy efficiency when selecting the near null frame.
再者，每經過一個週期時間後，中央控制器便會再次進行計算，以計算出不同百分比近空白子訊框之訊框格式之總吞吐量能源效益加 權值，再將複數個不同的總吞吐量能源效益加權值進行比較，進而使用最大之總吞吐量能源效益加權值所對應之訊框格式，而其中該訊框格式係以干擾差異值來決定哪個子訊框要做為近空白子訊框。 Furthermore, after each cycle time, the central controller will calculate again to calculate the total throughput energy efficiency of the frame format of different percentages of blank frames. The weight is then compared with a plurality of different total throughput energy benefit weighting values, and then the frame format corresponding to the maximum total throughput energy benefit weighting value is used, wherein the frame format is determined by the interference difference value. Which sub-frame is to be a blank blank frame.
舉一例子來說，假設一開始是沒有使用近空白子訊框的系統，即目前係使用該特定百分比為0%之近空白子訊框之訊框格式。然後，先計算出I、S和K的值，然後算出目前為0%近空白子訊框之訊框格式之總吞吐量能源效益加權值z t ，並在同一時間，把干擾差異值K按照大小降冪排列，把前固定百分比為12.5%大的K做近空白子訊框以形成一種訊框格式，使系統使用此種訊框格式。再接著，過了20ms之週期時間後，中央控制器再次以特定百分比為0%之近空白子訊框之訊框格式算出總吞吐量能源效益加權值z t ，並且算出特定百分比為0%加上固定百分比12.5%之近空白子訊框之訊框格式之總吞吐量能源效益加權值z t '，然後去比較z t 和z t '大小，如果z t 較大，系統就繼續使用原本的12.5%近空白子訊框的訊框格式，如果z t '較大，則使用新的近空白子訊框的訊框格式，而其中該新的訊框格式係以排列於特定百分比為0%加上固定百分比12.5%前之K做近空白子訊框，即新的12.5%近空白子訊框的訊框格式。 As an example, suppose that the system that does not use a near blank sub-frame is initially used, that is, the frame format of the near-blank sub-frame with the specific percentage of 0% is currently used. Then, first calculate the values of I, S, and K, and then calculate the total throughput energy efficiency weighting value z t of the frame format of the current 0% near blank sub-frame, and at the same time, the interference difference value K is followed. The size is reduced by power, and the K with a pre-fixed percentage of 12.5% is made into a blank frame to form a frame format, so that the system uses the frame format. Then, after a period of 20ms, the central controller again calculates the total throughput energy benefit weight z t with a specific percentage of 0% of the blank blank frame frame format, and calculates a specific percentage of 0% plus The total throughput energy efficiency weighting value z t ' of the frame format of the near blank header frame is fixed at 12.5%, and then the z t and z t ' sizes are compared. If the z t is large, the system continues to use the original The frame format of the 12.5% near blank sub-frame, if z t ' is larger, the frame format of the new near blank sub-frame is used, and the new frame format is arranged at a specific percentage of 0%. Add a fixed percentage of 12.5% before K to make a blank blank frame, which is the frame format of the new 12.5% near blank frame.
再接著，每過一個20ms的週期時間就會計算一次。假設上述中是z t '較大，即系統目前所使用之訊框格式包含了12.5%(於特定百分比為0%加上固定百分比12.5%前大之K)之近空白子訊框，中央控制器則針對目前的訊框格式(可視為具有特定百分比為12.5%之近空白子訊框)再次地計算出一個總吞吐量能源效益加權值z t ' 1，並且計算出特定百分比為12.5%加上固定百分比12.5%之近空白子訊框之訊框格式之總吞吐量能源效益加權值z t "，以及計算出特定百分比為12.5%減掉固定百分比12.5%之近空白子訊框之訊框格式之總吞吐量能源效益加權值，再比對z t ' 1、z t "及的值以取出最大的值，使系統改採用最大之值所對應之訊框格式。其中，當z t ' 1為最大時，則系統係繼續使用具特定百分比為12.5%之近空白子訊框之訊框格式(以數值較大並在特定百分比12.5%前之K來做近空白子訊框)；當z t "為最大時，則系統改採用具特定百分比為12.5%加上固定百分比12.5%之近空白子訊框之訊框格式(以數值較大並在特定百分比12.5%加固定百分比12.5% 前之K來做近空白子訊框)，並於後續20ms週期時間過後以25%為特定百分比來進行計算；當為最大時，由於特定百分比為12.5%減掉固定百分比12.5%為0%，則系統改採用另一種具12.5%之近空白子訊框之訊框格式(以數值較大並在固定百分比12.5%前之K來做近空白子訊框)，而後續20ms週期時間過後則以0%為特定百分比來進行計算。其中若為最大，而特定百分比減掉固定百分比不為0%時(假設特定百分比為25%)，則系統係採用具特定百分比(25%)減去固定百分比(12.5%)之近空白子訊框之訊框格式(以數值較大並在特定百分比25%減去固定百分比12.5%前之K來做近空白子訊框)。 Then, every 20ms cycle time is calculated. Assuming that the above is z t 'is large, i.e., the information system currently used frame format contains 12.5% (the percentage of a particular fixed percentage of 0% plus 12.5% before the large K) near the blank subframe, the central control The device calculates a total throughput energy benefit weight z t '1 for the current frame format (which can be regarded as a near blank header with a specific percentage of 12.5%) and calculates a specific percentage of 12.5% plus The total throughput energy efficiency weighting value z t " of the frame format of the near blank header frame of 12.5% is fixed, and the frame of the near blank header frame with a specific percentage of 12.5% minus a fixed percentage of 12.5% is calculated. Total throughput energy benefit weighting of the format , and then compare z t ' 1, z t " and The value is taken to take the maximum value, so that the system changes to the frame format corresponding to the maximum value. Wherein, when z t ' 1 is the maximum, the system continues to use the frame format of the near blank frame with a specific percentage of 12.5% (to make the near blank with a larger value and a K above a certain percentage of 12.5%) Sub-frame); when z t "is maximum, the system uses a frame format with a specific percentage of 12.5% plus a fixed percentage of 12.5% of the near blank frame (larger value and 12.5% at a certain percentage) Add a fixed percentage of 12.5% before the K to make a blank blank frame), and calculate it at a specific percentage of 25% after the subsequent 20ms cycle time; For the maximum, since the specific percentage is 12.5% minus the fixed percentage of 12.5% is 0%, the system uses another frame format with 12.5% of the near blank frame (larger value and fixed percentage of 12.5%) The previous K is used to make a blank blank frame, and after the subsequent 20ms cycle time, the calculation is performed with 0% as a specific percentage. Where For maximum, while a certain percentage minus a fixed percentage is not 0% (assuming a certain percentage is 25%), the system uses a near-blank sub-frame with a specific percentage (25%) minus a fixed percentage (12.5%). Frame format (to make a near blank message frame with a larger value and a specific percentage of 25% minus a fixed percentage of 12.5%).
綜合上述，本發明之利用近空子訊框於異質網路具能量效益之干擾協調方法，可依續在一個週期時間後不斷地重新進行數值計算，進而動態地調整近空白子訊框之使用比例，不僅僅可有效降低來自其大基地台對小基地台使用者的干擾之外，還可以確保使用大基地台之使用者設備的效能。 In summary, the energy coordination interference coordination method of the near-space frame in the heterogeneous network of the present invention can continuously recalculate the numerical value after a cycle time, thereby dynamically adjusting the usage ratio of the near blank frame. Not only can it effectively reduce the interference from the large base station to the small base station users, but also ensure the performance of the user equipment of the large base station.
以上所述僅為舉例性，而非為限制性者。任何未脫離本發明之精神與範疇，而對其進行之等效修改或變更，均應包含於後附之申請專利範圍中。 The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.
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