TWI272854B - Wireless base station using code power measurements - Google Patents
Wireless base station using code power measurements Download PDFInfo
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- TWI272854B TWI272854B TW092100069A TW92100069A TWI272854B TW I272854 B TWI272854 B TW I272854B TW 092100069 A TW092100069 A TW 092100069A TW 92100069 A TW92100069 A TW 92100069A TW I272854 B TWI272854 B TW I272854B
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- base station
- resource unit
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- 238000005259 measurement Methods 0.000 title description 37
- 238000004891 communication Methods 0.000 claims abstract description 34
- 239000011159 matrix material Substances 0.000 claims description 26
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 238000001228 spectrum Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 10
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 108010003272 Hyaluronate lyase Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
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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
- H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/04—Scheduled access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/7097—Direct sequence modulation interference
- H04B2201/709709—Methods of preventing interference
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Bidirectional Digital Transmission (AREA)
Description
1272854 ⑴ 玖、發明:說明 (發明說明應敘明:發明所屬之技術領域、先前技術、内容、實施方式及圖式簡單說明) 發明領域 本申請案主張2000年7月10日申請之臨時專利申請案 第60/217,093號之優先權。 本發明大體上關於在使用分碼多重存取之無線擴頻分 時雙工通訊系統中的資源分配。更特別地,本發明係關於 在這種系統中指派時槽及碼。 先前技術 第一圖係描述使用分碼多重存取(CDMA)之一無線擴頻 分時雙工(TDD)通訊系統。該系統具有複數個基地台 20! 至207。每一基地台2 0!係在其操作區域或單元中與用戶 終端設備(1^)22^223通訊。自基地台20!傳送至UE22!之通 訊稱之為下鏈通訊且自 UE22i傳送至基地台 2〇i之通訊稱 之為上鏈通訊。除了在不同頻譜上通訊之外,擴頻 TDD/CDMA系統係在相同頻譜上執行多重通訊。該多重信 號係以其各別的碼區別之。 由於使用一特殊碼送出之一信號可與相同頻譜中之信 號區別,因此每一碼可在該頻譜内產生一虛擬通訊頻道。 為了用於區別源自不同單元之信號,每一基地台2(^至207 皆具有一指派之加擾碼c * scramb。為了在這種系統中傳送 一特定之資料信號,該資料信號與其基地台之加擾碼 c * scramb混合且使用其指派之頻道碼展頻之。 亦,為了更有效率地使用擴頻,TDD/CDMA系統使用如 第二圖中所示之重複幀26且該重複幀係分割成譬如十五 -6- 1272854 (2) 個時槽等之複數個時槽至24n。在這種系統中,一通訊 係在選定之時槽 24 i至 24n中使用選定之碼而送出。緣 是,一幀26能夠執行藉時槽2七至24n及碼區分之多重通 訊。使用一展頻因數為十六時,在一單一頻譜下之單一時 槽之單一碼者係稱之為一資源單元。倘若使用一較低之展 頻因數時,則使用一單一時槽中之單一碼者將視為超過一 單一資源單元。為便於顯示,對於一時槽中之一碼使用一 展頻因數為一者係十六個資源單元。 第三圖之矩陣28中顯示使用N個時槽、S1至SN,Μ個 頻道碼、碼1至碼Μ,及0個頻譜、頻率1至頻率0。矩 陣28中每一空的單元格子皆代表一單一資源單元(倘若使 用一展頻因數為十六者)。該矩陣28具有總共ΜχΝχΟ個 資源單元。一典型TDD系統使用15個時槽、16個頻道碼 及一個或多重頻譜。根據支持一通訊所需之頻寬,將指派 一個或多重資源單元給予該通訊。 這種系統之一問題在於指派資源單元時將出現無線電 干擾。無線電干擾之成因相當多,譬如因接近無線電頻率 源及因在相鄰單元中傳送之信號所造成之交叉干擾。在一 資源單元上以一高干擾水準送出一通訊時可能造成信號 資料遺失。 發明内容 一種處理該問題之技術係在指派資源單元給予一通訊 之前瞬間測量每一時槽中之干擾水準。僅將具有可接受干 擾水準之時槽中的資源單元指派給予該通訊。儘管該技術 1272854
可降低信號資料遺失之可能性,但無法排除承受了不可接 受干擾水準之所有資源單元。此外’在指派之前瞬間測量 干擾水準需要使用貴重系統資源之廣泛監測。緣是,亟需 一種用於指派資源單元之方法。 複數個資源單元係在使用分螞多重存取之一無線分時 雙工通訊系統之一單元内指派。每一資源單元係與一時槽 及一碼有關。對於選定之該等單元的資源單元,測量該等 單元之時槽期間及使用該單元之碼的碼干擾水準。該碼功 率水準與一臨界值比較以決定該單元疋否具有一可接受 之碼千擾水準。由具有可接受千擾水準之資源單元中指派 複數個該單元而通訊之。 實施方式 第四圖係用於實施慢速及快速動態頻道分配(DCA) —簡 化的基地台20丨及UE22i。第五圖係慢速DCA之一流程圖。 以下將結合第六圖之優先矩陣92來說明第五圖中之流程 圖。第六圖係一優先矩陣92之一圖示,且該矩陣係由在 具有16個頻道碼、15個時槽及一頻率之一 TDD/CDMA系統 中之慢速DCA產生。矩陣92之每一單元格子皆代表240 個可能的資源單元其中之一。 初始時,在步騾80中、藉鏈增益(link gain),譬如藉由 千擾信號碼功率(ISCP)或決定單元間干擾等來測量每一時 槽中之無線電頻率功率干擾水準。可使用接收到之通訊短 脈衝串(burst)的中間碼來測量iSCP,但亦可使用其他ISCP 量測技術。可於基地台20!、UESZi至22n兩者中任一或該 1272854 ι__ (4) 兩者處測量每一時槽之干擾。對於在基地台20!處取得之 時槽干擾量測而言,該基地台之天線30將接收各種不同 無線電頻率之信號。接收到之信號將通過一單向器32而 到達解調器36以產生基頻帶信號。一時槽干擾量測裝置 52係處理該基頻帶信號,以藉由譬如180?等來測量幀26 之每一時槽至24n内的干擾水準。 對於自UE22!至22n取得之時槽干擾量測而言,UE之天 線60將接收各種不同無線電頻率之信號。接收到之信號 將通過一單向器或開關62而到達一解調器64以生成一基 頻帶信號。一時槽干擾量測裝·置 80係處理該基頻帶信 號,以藉由譬如ISCP等來測量^ 一時槽至24n内之干 擾水準在每一 UE22i至22n取得之時槽量測通常係發信號 至基地台2(^。另一選擇為,該等量測可與藉資料產生器 77生成而送至基地台2(^之上鏈資料多工。 步驟82中,基地台2(^處之一比較器56係將每一時槽之 干擾水準與一臨界值比較。倘若僅基地台20 !實施時槽干 擾量測,則比較每一該等量測與臨界值。倘量測僅使用 UE量測,則比較器56將比較每一時槽干擾水準之平均值 與該臨界值。倘若使用基地台20!及UE22!至22n之量測, 則使用每一時槽量測之一加權平均且賦予基地台者較高 權值。倘若UE量測、或UE及基地台量測明顯不同,則每 一個皆使用其本身之量測以決定時槽之可利用性。另,仍 可實施平均。步驟84中,倘若一時槽之干擾水準超過該 臨界值,則消除所有關於該時槽可能指派給予通訊的資源
1272854 單元。資源單元指派裝置58將消除儲存於優先矩陣92中 所有已消除之時槽資源單元。第六圖中顯示者係時槽 4 具有一不可接受之干擾水準。在時槽4之列中的所有資源 單元皆標示一「X」以指示已消除之可能指派。此外,其 他時槽可能為了譬如作為一廣播頻道等其他目的而保 留,以至於需消除並且相同地標示「X」。 在步驟86中,測量具有可接受干擾水準之時槽中的每 一資源單元之碼功率干擾水準。藉由碼功率干擾量測裝置 50、UE碼功率干擾量測裝置 68或該兩者而在基地台 2(^ 處取得碼功率量測。在UE2〇i處取得之碼功率量測可與上 鏈資料一同發信號或多工。 第七圖係描述一可能之碼功率干擾量測裝置50、68。碼 功率量測裝置 50、68係在用於傳送吾人所關注之碼的一 頻譜上動作。代表已接收到之頻譜的一信號94係輸入該 碼功率量測裝置中。輸入信號94可為一無線電頻率、一 中間頻率或一基頻帶信號。一碼相關(correlation)裝置96係 使該輸入信號與該吾人所要之碼相關。碼相關裝置96可 為一去展頻器、一相關器或一匹配濾波器。倘若該吾人所 關注之碼係一複數碼,則該相關器可執行一複數乘法以達 成相關。功率量測裝置98係累加相關部之功率。倘若使 用一複數碼,則該累加之和係經由累加該等複數部之量值 而得。最終之和即為該吾人所關注之碼的碼功率100。該 碼功率量測係於每一待測量之時槽期間内量取。可將測得 之功率指標成為一簡略數值,譬如第六圖中所示之「1」 -10- 1272854
至「 10」。 在比較器54處,將每一未消除之資源單元與一臨界值 比較。倘若僅基地台20!實施碼干擾量測,則這些量測將 與該臨界值比較。倘若僅使用UE之量測,則比較器54將 比較這些量測之平均與< 該臨界值。倘若使用基地台20!及 UEZSi至22n之量測,則使用一加權平均。通常賦予基地台 之量測一較高權值。另一選擇為,該干擾量測可特別為 UESSi至22n。此外,倘若UE量測、或UE及基地台量測明 顯不同,則每一個皆使用其本身之量測。比較每一 UE量 測與用於UE22!至22η之資源指派中的一臨界值。倘若UE 為特殊者,則每一 UE22!至22η具有其本身之優先矩陣92。 倘若一資源單元之碼干擾水準高於臨界值,則步驟 88 中將消除指派該資源單元。資源單元指派裝置 58將消除 優先矩陣92中之該資源單元。第六圖中顯示者係關於時 槽2及頻道碼1之該資源單元具有一不可接受之干擾水準 且在矩陣92中標示一「X」。步騾90中,資源單元指派裝 置58亦儲存該等可接受資源單元之碼干擾水準的優先矩 陣92中。如優先矩陣92中所示,該等干擾水準係藉一數 值「1」至「10」標示,且「1」具有一最高限度之可接受 碼干擾水準及「10」具有一極低之碼干擾水準。 基地台之資源單元裝置58係送出信號至基地台之資料 估計裝置 48、頻道估計裝置46、以及展頻及連串序列插 入(train sequence insertion)裝置421至42η來控制每一裝置所使 用之碼及時槽。頻道估計裝置46及資料估計裝置48係處 -11 -
1272854 理時槽中之基頻帶信號、及指派給予上鏈通訊短脈衝串 (burst)之適當碼、以及基地台之加擾碼c * scramb。指派之時 槽及碼係自資源單元指派裝置58送至頻道估計裝置46及 資料估計裝置48。頻道估計裝置46通常使用基頻帶信號 中之連_序列分量以提供譬如脈衝反應等頻道資訊。由資 料估計裝置48使用該頻道資訊來估計接收到之短脈衝串 中的資料。 譬如通過一業務頻道(traffic channel)而送至UE20丨至20nt 資料係由資料產生器4七至44n產生。該資料係根據資源單 元指派裝置58之通訊頻寬需求而指派一個或多重資源單 元。每一展頻及連串序列插入裝置42i至42n彳系混合資料與 基地台之加擾碼c * scramb '展頻該資料且使展頻參考資料 與適當時槽及指派資源單元之碼中的一連串序列時間多 工。該等展頻及連串序列插入裝置之輸出係稱為一通訊短 脈衝串。接著由一相對應之放大器4〇i至40n放大每一通 訊短脈衝串。藉一累加裝置38累加每一個放大之通訊短 脈衝串與經由其他裝置產生之通訊短脈衝。累加之通訊短 脈衝藉由一調制器3 4調制,調制後之信號通過一單向器 32且藉由圖示之一天線 30、或另一選擇為藉由一天線陣 列而輻射。該輻射出之信號將通過一無線之射頻介面 80 而到達1^22丨至22n。 該基地台之資源單元指派裝置亦將該資源單元指派送 至UE22!至22n。該指派可發信號到UESSi至22n或與業務資 料多工。由UE資料單元指派裝置76使用該送出之指派來 -12- 1272854 (8) 決定給予UE上鏈及下鏈頻道的資源單元。 對於接收到之下鏈資料,頻道估計裝置68及資料估計 裝置70係處理時槽中接收到之基頻帶信號、及指派給予 下鏈通訊短脈衝_之適當碼以及基地台加擾碼 c * scramb。指派之時槽及碼係自資源單元指派裝置58送至頻 道估計裝置68及資料估計裝置70。頻道估計裝置68通常 使用基頻帶信號中之連夢序列分量以提供頻道資訊。由資 料估計裝置70使用該頻道資訊來估計接收到之短脈衝串 中的資料。上鏈資料係由一資料產生器78產生。上鏈資 料係根據通訊之頻寬需求而指派一個或多重資源單元。展 頻及連串序列插入裝置74係混合該資料與基地台之加擾 碼 c * scramb、展頻該資料且使展頻參考資料與適當時槽 及指派資源單元之碼中的一連串序列時間多工。指派之資 源單元係藉由資源單元指派裝置76而送至展頻及連串序 列插入裝置74。源自展頻及連串序列插入裝置74之最終 序列係稱為一通訊短脈衝_。接著由一放大器72放大該 通訊短脈衝串。該放大之通訊短脈衝串係經由調制器 66 調制成無線電頻率、通過一單向器62且藉由一天線60、 或另一選擇為藉由一天線陣列而輻射。該輻射出之信號將 通過一無線射頻介面80而到達基地台2〇ι。 由資源單元指派裝置58所使用之優先矩陣92係根據一 每一幀之基礎或根據一更週期性之基礎來更新。使用一統 計分析,優先矩陣92可根據自分鐘級至每曰級之基礎為 一週期更新。一方法中,用戶終端設備22!至22η係在連續 1272854 ,_ (9) 之接收與傳送短脈衝串之間的空載期間内測量該時槽干 擾水準及碼干擾水準。將這些量測送至基地台2(^。另一 方法中係在一週期性基礎上實施量測。一不同方法中,基 地台2〇i將發信號到UE22!至22n以實施量測。緣是,可當 接受到請求時即實施量測。基地台20!係根據這些量測來 更新優先矩陣 92。接著將更新後之資源單元指派自基地 台20!送到UE22〗至22n。 第八圖係快速 DCA之一流程圖且亦結合第四圖及第六 圖說明之。為了支持通訊,指派一單元作為上鏈及下鏈兩 者用之資源單元。指派之資源單元數量係根據上鏈及下鏈 頻寬之需求而定。步驟106中,當該單元需要額外之資源 單元時,資源單元指派裝置58將選擇額外之資訊單元配 給予上鏈及下鏈通訊。步驟94中係使用優先矩陣92,使 得資源單元指派裝置58將自可用資源單元指派一相對應 數量之資訊單元。相反地,當需求減少時,資源單元指派 裝置58將釋放該等資源單元。 選擇資源單元之一方法係第一個可使用。使用該技術 時,指派裝置58係搜尋優先矩陣92直到其到達第一個可 用之接受時槽為止。以使用矩陣92者來說明,倘若需要 兩個資源單元,則由碼1、槽1開始且首先由左至右運作, 則可選擇碼i、槽5及槽6。該等槽係首先遇到之可接受 槽。 另一方法係搜尋最小干擾頻道者。指派裝置58係在優 先矩陣92中搜尋具有最低碼干擾水準之資源單元。在此 -14- 1272854 (10)
加以說明,倘若欲選擇一資源單元,則選擇具有一數值 「10」之碼5、槽11。由於該方法係在選擇一資源單元前 搜尋整個矩陣 92,因此需要更多處理時間。然而,由於 選定之資源單元係在該等可用資源單元中具有最低干擾 水準者,因此可減少通訊干擾。 在使用最佳功率控制之系統中,較優地係指派連續時 槽。在這種系統中,可使用一修正之方法。使用搜尋第一 個可用者之方法時,可指派具有第一可用數量之連續時 槽。譬如,倘若指派三個時槽,則可選擇碼1、S5至S7。 使用最小干擾頻道者之方法將選擇具有最小干擾之連續 時槽。譬如,倘若指派三個,則可選擇碼1、S11至S13。 相似地,為了將使用之時槽數量最少化,因此可指派一 時槽内之多重碼,譬如碼1至S11至S13。此外,可使用 譬如區塊等一複合式方法一亦即碼1、S11至S12及碼2、 S11至S12等四個資源單元。 一種指派資源單元之技術係將使用之時槽數量最少 化。藉由減少使用之時槽數量可減少對相鄰單元之干擾。 若使用多重臨界值技術,則當起初需分配資源單元時,該 系統將尋找由干擾水準所決定之可用碼數量為最多的時 槽或複數個槽。結果,分配給予一給定數量資源單元的時 槽數量將最少。 初始分配後,將指派資源單元給予已分配到碼作通訊但 仍具有第一個可用碼之該等時槽。該分配將可防止使用額 外之時槽。當先前指派之時槽已使用後,將指派新的時槽 -15 - 1272854 (11)
且首先指派具有最多數量可用碼的時槽。 第十一圖係顯示一種方法,用於控制指派給予一時槽之 碼的最多數量。一般而言,期望限制使用時槽之數量。藉 由不使用時槽,可將這些時槽保留予其他交又干擾之單元 使用。 124中可測量每一時槽之干擾水準。為了決定每一時槽 中應該使用之碼的數量,因此利用一多重臨界值方案。126 中係比較每一槽中測得的干擾,且1 28中係由該比較結果 來決定需指派之時槽最大數量。一多重臨界值方案係使用 如第九圖所示之兩臨界值h及12。倘若該測得之干擾水準 低於I!,則可在該時槽中指派參重碼110。倘若該測得之 干擾水準介於I!及12之間,則可在該等時槽中指派一碼 112。倘若該干擾水準高於12,則該時槽中無任何碼114可 使用。 其他之多重臨界值方案係使用超過兩干擾水準 h、 12、· · · 、I n。倘若該測得之水準高於I n,則無任何 碼122可用。倘若介於In與之間,則單一碼120可使 用。用於時槽之可用碼數量將保持對每一臨界值In.2、In.3 等增加一個直到干擾水準小於Ii為止。當該干擾水準低於 U時,η碼118可用於時槽。 圖式簡單說明 第一圖係一無線擴頻TDD/CDMA系統。 第二圖係在重複幀中之時槽的一圖示。 第三圖係在由頻道碼、時槽及頻率區別之資源單元的一 -16 - 1272854 (12) 圖示。 第四圖係一簡化之基地台及用戶終端設備。 第五圖係low動態頻道指派之一流程圖。 第 圖 係 一 優 先 矩 陣 之 一 範 例 0 第 七 圖 係 一 碼 功 率 干 擾 水 準 量 測 裝 置 〇 第 八 圖 係 快 速 動 態 頻 道 指 派 之 一 流 程 圖 第 九 圖 係 兩 臨 界 值 之 碼 指 派 的 一 圖 示 〇 第 十 圖 係 多 重 臨 界 值 之 碼 指 派 的 一 圖 示 第 十 一 圖 係 多 重 臨 界 值 之 碼 指 派 的 — 流 圖 式 元 件 符 號 說 明 201 〜2〇7 ! 基 地 台 22i 〜223 使 用 者 設 備 24, 〜24n 時 槽 26 幀 28 92 矩 陣 30 60 基 地 台 天 線 32 62 單 向 器 或 開 關 34 66 調 制 器 36 64 解 調 器 38 累 加 裝 置 40 1〜, 4〇η 72 放 大 器 42丨〜42n 74 展 頻 及 連 串 序 列 插 入 裝 置 44 丨〜44n 77 資 料 產 生 器 46 68 頻 道 估 計 裝 置
-17- 1272854
(13) 48、 70 資 料估 計 裝 置 50、 78 碼 功率 干 擾 量 測 裝置 52、 80 時 槽干 擾 量 測 裝 置 54、 56 比 較器 58 資 源單 元 指 派 裝 置 76 資 源單 元 指 派 裝 置 79 無 線射 頻 介 面 94 信 號 96 碼 相關 裝 置 98 功 率量 測 裝 置 100 碼功率 110 多 重碼 112 單 一石馬 114 無 碼 118 N 碼 120 單 一石馬 122 無 碼
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Claims (1)
1272854 拾、申請專利範圍 1. 一種無線基地台,包括: 一資源單元指派裝置,用以接收資源單元之碼干擾位 準,利用該等接收碼干擾位準產生一偏好矩陣,並利用 該偏好矩陣以將資源單元指派予各個通訊,其中,各個 資源單元係關連於一時間槽及一碼。 2. 如申請專利範圍第1項之無線基地台,其中,該基地台 更包括一碼功率干擾量測裝置,其係利用一資源單元之 時間槽期間、該資源單元之碼,藉以量測該資源單元之 碼干擾位準。 3. 如申請專利範圍第1項之無線基地台,其中,該基地台 更包括一時間槽量測裝置,用以量測一時間槽之一干擾 位準。 4. 如申請專利範圍第1項之~無線基地台,其中,該基地台 資源單元指派裝置係消除量測干擾超過一臨界值之該 等選定時間槽。 5. 如申請專利範圍第1項之無線基地台,其中,該偏好矩 陣係表示消除之時間槽。 6. 如申請專利範圍第1項之無線基地台,其中,該資源單 元指派步驟首先係將該偏好矩陣中之一資源單元指派 以一最低千擾位準。 7. 如申請專利範圍第1項之無線基地台,其中,該資源單 元指派步驟係將一用戶終端設備之複數資源單元指派 予連續之時間槽而完成。
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HK (1) | HK1065911A1 (zh) |
IL (2) | IL153849A0 (zh) |
MX (1) | MXPA03000304A (zh) |
MY (1) | MY129223A (zh) |
NO (1) | NO20030107L (zh) |
SG (1) | SG119189A1 (zh) |
TW (7) | TWI272854B (zh) |
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