TWI252638B - Dynamic channel quality measurement procedure for adaptive modulation and coding techniques - Google Patents

Dynamic channel quality measurement procedure for adaptive modulation and coding techniques Download PDF

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TWI252638B
TWI252638B TW092127550A TW92127550A TWI252638B TW I252638 B TWI252638 B TW I252638B TW 092127550 A TW092127550 A TW 092127550A TW 92127550 A TW92127550 A TW 92127550A TW I252638 B TWI252638 B TW I252638B
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channel
base station
downlink
quality measurement
quality
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TW092127550A
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TW200419964A (en
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Stephen E Terry
Stephen G Dick
James M Miller
Eldad Zeira
Ariela Zeira
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Interdigital Tech Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/20Monitoring; Testing of receivers
    • H04B17/24Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/382Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026Transmission of channel quality indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027Scheduling of signalling, e.g. occurrence thereof
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/56Allocation or scheduling criteria for wireless resources based on priority criteria
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management

Description

1252638 五、發明說明(1) --- 發明所屬之技術領域 本發明關於無線通訊系統。尤其是,本發明係關於使 用刀碼夕工存取(c〇de — divisi〇n multiple access , CDMA)技~術之通訊站。本發明特別是關於決定用於有效利 用無線貧源使用率及選擇使用者服務之資料速率之無線狀 況0 先前技術
▲於分碼多工存取第三代(3G)細胞通訊系統中,適應性 口周、灸及、、扁碼技術(a d a p t i v e m 〇 d u 1 a t i ο n a n d c 〇 d i n g, AM&C)被應用於傳輸以便達成改善的無線資源使用率,並 在適當的狀況下提供增加的使用者服務資料速率。這些 AM&C技術預先將無線傳輸狀況列入考慮,以便決定從使用 ^些技術之目前無線傳播情況中獲得有益之調變及編碼速 於使用這些AM&C技術時,需要在每個傳輸之前, 收器提供實體頻道品質測量的程序。基於此品質測量, 輸器決定特定傳輸之適合的調變及編碼速率。 *
、於CDMA系統中,如同以任何無線系統,無線狀 因為自然或人為狀況二者的廣泛變化而快迷改變。因^ 道品質測良被用以決定傳輸調變及編碼,且因 $ 之情況改變所產生之頻道品質之快速改變,適岸性 理係直接與頻道品質測量之時間與傳輸開始之 時間週期長度有關。 之間 五、發明說明(2) 實體或邏輯控制頻道 收器傳輸至傳輸器。頻所“用以將頻道品質測量從接 設備(user equipn]ent,:)貝^虎'以使用對每-使用者 共享之共用控制頻道。ϋΕ可以θ /、控^頻道或由所有UEs 抑_),而(個人資料助⑴或Λ話機(cel 1 品質測量的傳播:::“連 因為品質測量持續的存在。考滴▲理想解决方案, 之持續存在的品質測量,傳;周變及編瑪設定用 .,A ^ ^ ^ 得輸了以在任何時後發生。因 二,==頻道總是存在於上行連結(灿⑷的方 ,使:專i二fi以支持低速率上行連結資料傳輸。 有技制頻這方法的困難在於,即使在沒有資料 =的:ί仍持續配置實體層資源。AM&C技術之主要應用 疋非即時尚貪料速率服務’例如’網際網路存取。為這些 服務的等級,最佳的服務品質(Q〇s)以短的,且相當長的 ί專輸之間的閒置週期而達成。這些長的閒置週期產生專用 資源使用的低效能。 此問題可以藉由預先規劃週期的專用頻道配置而被降 至最小。但產生品質測量之週期性的存在。如果品質測量 未連續存在,對於在任意時間產生傳輸之UEs而言,只有 某些UEs將具有最近的頻道品質測量。 另一方式是共用控制頻道的使用。以共用空制頻道的 使用,存在一個由細胞内所有UEs共用之連續訊號頻道。 決疋母一UE對共同控制頻道存取的程序被定義。㈣識別被 1252638 — - 五、發明說明(3) 用以區分特定的業務。支援AM&C之共同控制方法的困難在 於測量每〆UEs對控制頻道存取所需之大量的訊號經常性 費用。如前所述’ UE識別是需要的以便區分ue特別的業 務。因此,為避免對上行連結共用控制頻道之以競爭為基 礎之存取,在下行連結(downl ink)共用控制頻道上之每一 UEs存取之個別配置需要發訊號。因為上行連結並非總是 可預期的,上行連結控制頻道之週期性配置必須在丁行連 結控制頻道上發訊號,其產生相相當的發訊號的經常性費 用。同時,共用控制方法不提供低速率,上行連結資料傳 輸0 綜合言之’ AM&C技術之 器之每一傳輸器之最近實體 者,測量以具有動態資料傳 存在。此專用控制頻道解決 傳輸是不連續的,這對無線 期性設計的專用控制頻道使 加了測量的延遲。共同控制 礎上提供測量,但使訊號標 的無效率使用。
效率主要是基於事先來自接收 頻道品質測量的效益。較佳 輸之所有使用者之最小延^而 方法提供連續的測量,但因為 資源之使用是沒有效率的。週 無線資源需求為最少,但這增 頻道方法可以在連續或週期基 記的經常性費用產生無線資ς 需要能夠提供具有低延遲及低 方法。 圖式簡要說明 訊號標記經常性費 用之
本發 其中: 明之目的係藉透過參考所附圖式而變得更清楚
1252638
第一圖係本發明較佳之動態頻道品質測量程序 (dynamic channel quality management procedure , DCQMP)之流程圖。 第二圖表不第一圖所示之本發明iDCQMp之另一實施 例0 實施方式 所示之較佳實施例於下文參照所附圖式而被描述,其 中相同的標號始終代表相同的元件。 弟圖係本發明動怨頻道品質(c h a η n e 1 q u a 1 i t y, CQ)測量程序60之流程圖,其可藉由具有與至少一使用者 設備’以下係以UE 30代表,通訊之基地台/點3(以下稱基 地台1 2 )無線數位通訊系統實施。雖然所呈現之發明方法 意於支援一基地台與複數UES之間的通訊,為簡要說明之 故’以下之描述將詳細說明由單一UE所執行之步驟;(可 了解的疋所有其它UEs將以相同方式運作)。下行連結(DL) 資料被傳輸至指定給一特定UE 3〇之基地台12(步驟S1)。 ,基地台1 2回應下行連結資料之接收並於傳輸之㈣3〇 之前要求僅來自具有未決之向下傳輸之一 UE 3〇之儿cq 測量(步驟S2)。 UE 30在步驟S3接收該要求並於步驟S4回報該儿⑶測 量至基地台1 2。 基於從每一 UE接收之CQ測量報告(步驟S5),基地台12
第13頁 1252638 五、發明說明(5) 決定那一UEs將具有最佳的無線資源使用效率,並決定使 用那一時槽(slot)(步驟S6)。較佳者’此UEs藉由其CQ 而被排列優先次序,因此,具有最高CQ之UE首先被傳送資 料,然後具有第二高CQ的UE接著被傳送其資料,依此類 推’直到具有最低CQ之UE的資料隶後被傳送為止。 因為CQ測量要求及回應的CQ報告只在需要時產生,共 用控制頻道所需之訊號發送經常性費用可大幅降低。測量 報告為所有活動中的傳輸使用者而存在,類似專用控制頻 道’但避免了在閒置週期中之資源的無效率使用。 傳輸的優先次序依據DL CQ測量而決定,且DL實體頻 道配置發訊號至適合的U E s,指示特定的編碼速率,調變 型態及配置時槽(步驟S7)。被指定的UE接收該編碼速 率’調變型態及配置時槽(步驟S 8 ),並設定這些接收用之 參數(步驟S9)。 在步驟S7之執行後一預定(但是短時間)時間後,下行 連結資料之區塊隨後由基地台12傳送至被指定的肫3〇 (步 驟S1 〇),以致能UE 30之接收用之時間設定。UE 30在特定 的編碼速率,調變型態以及於步驟S7所指定之配置時 接收下行連結資料。 次本發明因此提供AM&C運作所需之基礎需求而維持無線 I Z =最大使用效率。因為DL CQ測量以所有傳輸之最 —志I能延遲而存在,於下一傳輸時間框中被提供服務之 連用者的選擇可以達到最佳。此外,㈣期性或 、、栈制提供之測量不提供比本發明增加的利益,效能增
1252638 五、發明說明(6) 盈或加強。 本發明之實施也使測量程序處理及相關的消耗功率為 對-般由限制容量之小功率(亦即,一充電電池)所 :電之UE尤其重要?為品質測量僅為一特定的活動傳輸 而被要求,所需之糙重的數目可被降至最小。 依據第二圖所示之本發明另—實施例之方法7〇,僅需 4:定數量的測量,依據-特定傳輪所使用之無線資源而 =。例如,在3G標準中,僅為特定實體時槽之可被要 ^因A,藉由限劃測量之需求於活動傳輸以及,依據 傳輸之尺寸,僅需特定無線資源(亦即,特定之時槽)上之 測量’所執行之測量的數目可以降低。這被表示於第二 圖,其類似第一 BI,除了修改的步驟S2A及S3A之外, =取代第-圖之步驟S2與S3。於步驟S2A,基地台12要求 UE 30執行僅於-特定無線資源上執行測量。回應該要 求,UE在特定的無線資源上執行儿⑶測量(步驟s3a)。 提供許多優點。首先,本發明提 成,之,將需要回飢CQ測量之請求。這;許 之經常性費用為最小。 、兄汗毛Λ號 其次,因為傳輸係依據 排優次序,每一時神赤夕士敢 貝DL CQ ^ $而被排安 可被達成。’槽或约槽之可允許的最高資料速率將 第二,因為UEs僅需回應儿CQ測量之 UEs之不需要的測量,藉此節拠電池壽命將不'要 1252638 五、發明說明(7) 本發明之最後優點在於此處所揭示之方法的細胞中所 能支援之使用者數目的增加。被支援之使用者的數目於專 用控制頻道方法中被專用無線資源之需求所限制;而於共 用控制頻道方法中被發訊號之經常性費用需求所限制。藉 由限制對活動使用者之測量發訊號程序,本發明使共用控 制之發訊號經常性費用為最小並支援細胞中最多的使用者 數目。 雖然本發明以最佳實施例而被描述,其它落入如申請 專利範圍中所描述之本發明範圍之變化對熟悉本技藝之人
第16頁 1252638 ------------- 圖式簡單說明 第一圖係本發明較佳之動態頻道品質測量程序 (dynamic channel quality management procedure , DCQMP)之流程圖。 第二圖表示第一圖所示之本發明2DCqMP之另一實施 例0 元件符號說明 12 :基地台
UE 30 :使用者設備 60 :動態頻道品質(channel Quality,CQ)測量程序
第17頁

Claims (1)

1252638 六、申請專利範圍 1. 一種在一無線數位通訊系統中針對一基地台進行無線 資源利用最佳化並調整資料速率的方法,該方法係包括步 驟: (a) 傳輸一頻道品質量測之請求; (b) 接收該頻道品質量測的結果; (c ) 根據該頻道品質量測的結果來配置無線資源;以及 (d) 遵照該配置而傳輸一通訊信號。 2. 如申請專利範圍第1項之方法,其中該通訊信號係指一 特定編碼速率、調變型態以及至少一配置槽。
3. 如申請專利範圍第1項之方法,其中該頻道品質量測的 結果係被用以決定哪些複數個時槽要被使用。 4. 如申請專利範圍第1項之方法,其中該步驟(c)乃包含 根據該頻道品質量測的結果來配置時槽。 5. 一種在一無線數位通訊系統中針對一基地台進行無線 資源利用最佳化並調整資料速率的方法,該方法係包括步 驟: (a) 接收一數量的下行連結資料 (b) 傳輸一頻道品質量測之請求 (c ) 接收該頻道品質量測的結果;以及 (d )根據該頻道品質量測的結果以及所接收到的下行連結 資料的該數量來配置時槽。 6. 一種在一無線數位通訊系統中將無線資源利用予以最 佳化並且調整資料速率的基地台,其乃包含: (a )用以接收下行連結資料區塊的裝置;
第18頁 1252638 六、申請專利範圍 (b )用以傳輸一頻道品質量測之請求的裝置; (c) 用以接收一量測到之下行連結頻道品質數值的裝置; (d) 根據該量測到之下行連結頻道品質數值而決定無線資 源之最佳利用的裝置;以及 (e )用以決定轉換該資料之至少一部份的一調變/編碼速 率的裝置。 7. 如申請專利範圍第6項所述之基地台,其中該調變/編 碼速率係以該量測到之下行連結頻道品質數值為基礎而決 定。
8. 如申請專利範圍第6項所述之基地台,更包含: (f )用以配置複數個時槽的裝置。 9. 一種在一無線數位通訊系統中針對一基地台進行無線 資源利用最佳化並調整資料速率的方法,該方法係包括步 驟: (a ) 接收下行連結資料區塊以進一步分配至複數個目的 地; (b )傳輸一請求以執行一下行連結頻道品質量測; (c )接收一該下行連結頻道品質量測的結果之報告; (d )傳輸一下行連結實體頻道配置信號;以及 (e )根據該下行連結實體頻道配置信號而自該基地台傳輸 下行連結資料區塊。 10. 如申請專利範圍第9項所述之方法,其中該步驟(b)更 包含該基地台針對該下行連結頻道品質量測而指定複數個 時槽的步驟。
第19頁 1252638 六、申請專利範圍 11. 如申請 指的是一特 12. 一種在 佳化並調整 (a)用以接 裝置; (b )用以傳 的裝置; (c) 用以接 置; (d) 用以傳 (e) 用以根 傳輸下行連 13. 如申請 地台針對該 置。 14. 如申請 號指的是一 專利範圍第9項所述之方法,其中該配置信號 定編碼速率、調變型態以及至少一配置槽。 一無線數位通訊系統中把無線資源利用予以最 資料速率的基地台,其乃包含: 收下行連結資料區塊以分配至複數個目的地的 輸待執行之一下行連結頻道品質量測之一請求 收一該下行連結頻道品質量測之結果報告的裝 輸一下行連結實體頻道配置信號的裝置;以及 據該下行連結實體頻道配置信號而自該基地台 結資料區塊的裝置。 專利範圍第1 2項所述之基地台,更包含使該基 下行連結頻道品質量測而指定複數個時槽的裝 專利範圍第1 2項所述之基地台,其中該配置信 特定編碼速率、調變型態以及至少一配置槽。
第20頁
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