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TWI301362B - 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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Publication number
TWI301362B
TWI301362B TW094116184A TW94116184A TWI301362B TW I301362 B TWI301362 B TW I301362B TW 094116184 A TW094116184 A TW 094116184A TW 94116184 A TW94116184 A TW 94116184A TW I301362 B TWI301362 B TW I301362B
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Taiwan
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mts
base station
downlink data
channel quality
communication system
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TW094116184A
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TW200629763A (en
Inventor
E Terry Stephen
G Dick Stephen
M Miller James
Zeira Eldad
Zeira Ariela
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Interdigital Tech Corp
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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
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

1301362 九、發明說明： 【發明所屬之技術領域】 本發明關於無線通訊系統。尤其是，本發明係關於使用分 碼多工存取(c〇de-division 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資源使用率及選 擇使用者服務之資料速率之無線狀況。 【先前技術】 於分碼多工存取第三代(3G)細胞通訊系統中，適應性調變 及編碼技術(adaptive modulation and coding，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，以便決定從使用這些技術之目前無線傳播情 況中獲得有益之調變及編碼速率。 於使用這些AM&C技術時，需要在每個傳輸之前，從接 收斋提供貫體頻道品質測量的程序。基於此品質測量，傳輸器 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，無線狀況可能 因為自然或人為狀況二者的廣泛變化而快速改變。因為頻道品 質測良被用以決定傳輸調變及編碼，且因為傳輸路徑之況= 變所產生之頻道品質之快速改變，適應性傳輸處理係直接盘頻 道品質測量之時間與傳輸開始之時間之間的時間週期長产有 1301362 實體或邏輯控制頻道隨後被用以將頻道品質測量從接收 器傳輸至傳輸ϋ。紐品質職可以使㈣每—使用者設 (user equipment, ue)專用的控制頻道或由所有 共旱之共用|空制頻道。UE可以是細胞式話機_ phone) ’ PDA(個人資料助理)或其它型態之無線裝置。
，制頻道被使用時，-連續訊號頻道為每一证之頻道^測 =的，播而超時存在。此為施&(：之理想解決方案，因為品 質測量持續的存在。考慮適當的調變及編碼設定狀持續存: 的=量’傳輸可以在任何時後發生。因此，以專用控制頻 運喊存在於上彳了連結(uplink)的方式，親可以觀以支持 低速率上行連結資料傳輸。
使用專^控制頻道方法的困難在於，即使在沒有資料傳輸 、=持續配置實體層資源。雇&c技術之主要應用是非 心而浦速率服務，例如，崎網路存取。為這些服務的等 =、’最佳的服務品質(QoS)以短的，具相當長的傳輸之間的閒 ▲置週期而達成。這些長的閒置週期產生專㈣源使用的低效 月& 0 曰此問題可以藉由預先簡週躺專_道配置而被降至 =小。但產生品質測量之週紐的存在。如果品制量未連續 ^在’對於在任意時間產生傳輸之版㈣，只有某些UEs 將具有最近的頻道品質測量。 =一方式是共用控制頻道的使用。以共用空制頻道的使 =存在—麵細胞⑽有版翻之_訊號頻道 。決定 母 對共同控制頻道存取的程序被定義。UE識別被 6 1301362 用以區分赋的祕。域am&c之共同㈣方法的困 難在於測量每-UEs對控_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证特另^業 務。因此，為避鱗上行賴共驗繼道之喊爭為基礎之 存取，在下行連結(downlink)共用控制頻道上之每一 ms存取 =個別配置需要發訊號。_上行連結麟總是可預期的，上 仃連結控制頻道之週期性配置必須在下行連結控制頻道上發 訊號，其產生相當的發訊號的經常性費用。同時，共用控制^ 法不提供低速率，上行連結資料傳輸。 综合言之，AM&C技術之效率主要是基於事先來自接收 ，之每一傳輸器之最近實體頻道品質測量的效益。較佳者，測 量以具有動態資料傳輸之所有使用者之最小延遲而存在。此專 用控制頻道解決方法提供連續的測量，但因為傳輸是不連續 的，這對無線資源之使用是沒有效率的。週期性設計的專用控 制頻道使無線資源需求為最少，但這增加了測量的延遲。共同 控制頻道方法可以在連續或週期基礎上提供測量，但使訊號標 &己的經常性費用產生無線資源的無效率使用。 需要能夠提供具有低延遲及低訊號標記經常性費用之方 法。 本發明之目的係藉透過參考所附圖式而變得更清楚，其 中： 第一圖係本發明較佳之動態頻道品質測量程序(dy nami c ehannel quality management procedure，DCQMP)之流程圖。 第二圖表示第一圖所示之本發明之DCQMP之另一實施 1301362 例。 第三圖表示本發明之DCQMP所使用之構件示意圖。 所示之較佳實施下文參照所_式而餘述，其中相 同的標號始終代表相同的元件。 【實施方式】 第一圖係本發明動態頻道品質(channel quality，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’通訊之基地台人點％以下稱基地台12)無線 數位通訊系統實施。此通訊之基地台的設置如第三圖所示，一 基地台300具有一傳輸器305及-接收器310。雖然所呈現之 ，明方法意於域-基地台與複數版之間的通訊，為簡要 說明之，’以下之描述將詳細說明由單一证所執行之步驟； (可了解的是所有其它版將以相同方式運下 資料被傳輸至指定給-特定_之基地L) 基地台I2回應下行連結資料之接 傳 前要求僅來自具有未決之向下傳輸之一证 (步驟S2)。 L W測里
UE 30在步驟S3接收該要求並於步驟 測量至基地台12。 CQ 基於從每- UE接收之CQ測量報告(步驟叫 /'I- uEm^佳的無線資源使用效率，並u 那一時槽（slot)(步驟S6)。較 〜、疋使用 )孕乂仏者，此UES猎由其CQ而被排 8 1301362 J此’具有最高CQ之UE首先被傳送資料，然 且古曰呵CQ的促接著被傳送其資料，依此類推，直到 、有取低CQ之UE的資料最後被傳送為止。 用料量要求及喊的CQ報告只在需要時產生’共 真:女从所需之崎發送經常性費用可大幅降低。測量報告 :有活動中的傳輪使用者而存在，類似專用控制頻道，但避 免了在間置週射之資源的無鱗使用。 一 、苦傳輸的優先次序依據DLCQ測量而決定，且DL實體頻 U己置發訊號至適合的服’指示特定的編碼速率，調變型能 ，置時槽（步驟S7)。被指定的证接收該編碼速率，‘ 態及配置時槽(步驟S8)，並設定這些接收用之參數(步驟 —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傳送至被指定的证3〇(步驟 S10)，以致能UE 30之接收用之時間設定。证3〇在特定的編 碼速率，調變型態以及於步驟87所指定之配置時槽中接 行連結資料。 本發明因此提供AM&C運作所需之基礎需求而維持無線 資源之使最大使用效率。因為DL CQ測量以所有傳輸之^小 的可能延遲而存在，於下一傳輸時間框中被提供服務之一或多 位使用者的選擇可以達到最佳。此外，由週期性或連續機制^ 供之測量不提供比本發明增加的利益，效能增益或加強。 本發明之實施也使測量程序處理及相關的消耗功率為最 少，對一般由限制容量之小功率(亦即，一充電電池)所供電之 1301362 UE尤其重要。因為品質測量僅 求，所需之㈣的數目可被降至^小。 傳輪而被要 依據第二圖所示之本發明另_實施例之方法 疋數量的測量，依據一特定傳輸所使用之無線資源而^ : =在3G標準中’僅為特定實體時槽之CQ可被要求。因此'， =CQ測1之需求於活動傳輸以及’依據傳輸之尺 僅需特定無線資源(亦即，敎之嗎上之_ '之^
量的數目可以降低。這被表示 丁= 修改的步驟S2A及S3A之外，其H弟—圖’除了 與S3。於步驟S2A ’基地台12要求顶3()執行 線資源上執行啦。喃、該絲，顶 ^ ^執 行DLCQ測量(步驟S3A)。 I、線貝源上執 氣介術上提供許多伽。I先，本發明提供空
UEs將需要回應DLCQ測量之μ夂j未凡成傳輸之 費用為最小。Μ里之明求。每允許發訊號之經常性 優-欠Ϊ次辦觸最高品f沉CQ _被排安排 成-。序母-_或多時槽之可允許的最高資料速率將可被達 第三，因為UES僅需喊DLCQ測量之請求，將不需要 卿之不需要的測量’藉此節省UEs電池壽命。 本發明之最後伽在於此處所鮮之方法的細胞中所能 支板之使肖糖㈣增加。财狀使 親方法倾專職線資源之需麵_;秘油 10 1301362 頻道方法中被專用無線資源之需求所 方法中被發訊號之經常性費用需求所限制:由限 用==二本發明使共用控制之發訊=常： 用為取小亚支叙細胞中最多的使用者數目。 買 ♦雖然本發明以最佳實施例而被描述，其炫人如申料利 靶圍中所描述之本發明顧之變化對熟 將是明顯的。 " 而曰
【圖式簡單說明】 第一圖為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之DCQMP之另一實施 例。 第三圖表示本發明之DCQMP所使用之構件示意圖。 【主要元件符號說明】 12、300 :基地台 UE30 :使用者設備 60 :動態頻道品質(channel quality，CQ)測罝程序 3〇5 :傳輸器 310 :接收器 11

Claims (1)

1301362 十、申請專利範圍： 地台时最佳化-無線觀系統中的下行:# 法，其中所述無線通訊系統包含多個移動終端（Μτ 方 包括步驟··： ）听適方法 資料ΐ塊所述基地台接收用於傳輸到至少_所述MTs的指定下行 行-(b4==應步驟⑻而針對各MT傳輪-請求，以執 測量⑹所述基地台接收來自所述多個MTs的請求下行頻道品質 =將 娜祕而決定哪 各ϋ所述基地台將編碼速率、調變型態以及時槽資訊發送給 2 建立—資料轉換優先權；以及 ΰ根據步驟⑻的發送資訊以及步卿)的優先權 法，苴益绩佳/化一鱗通訊系統中的下行資料轉換的方 ί括ϋ 通訊系統包含多個移動終端（_)，所述方法 傳輸觸獅MTS中的特定數個 ^ ^ MTS MT 下行2道台接收來自所述特定數個MTs的各MT的請求 用嶋個腿㈣可最充分地利 ⑹所述基地台配置所述優先缝將使用的時槽； 12 1301362 (f)所述基地台在所述特定數個MTs回應所述 =斤配置的_崎触定的下行:#龍塊傳輪輯述特定數^ 丄V丄丄S 〇 3· -種基地纟絲最佳化-絲触祕巾的下行資換 ί括ί:所述無線通訊系統包含多個移動終端（MTS)，所述方法 晴脚瓣鑛_定數個 $所述基地台回應接收自所述特定 (c)所述基地台根據所述下行頻道^^ ^ ^ ^ =及的下權量’配置—特定數== 配署(di主戶!f基地台在所述特定數個MTs回應請求之後，根據所 ^的時槽而將所指定的下行資料區塊傳輸至所述特定數個 4中無線通訊系統中的下行資料轉換的的基地台，1 包含多個移動終端（MTs)，所述基地台包含; 指定下行資料4=_齡_谢少一 mt的 執行-下行頻道品質測，ίί九一MT的指定下行資料區塊而 述至少一 MT的咬里，其中夕個無線資源乃因應接收來自所 :r:以===== ϋ 13 1301362 6·如申請專利範圍第4項所述的基地台，其中所述基地台將一特 定編碼速率、調變型態以及配置時槽指示給所述至少一 Μτ。 7· —種最佳化一無線通訊系統中的下行資料轉換的的基地台，其 中所述無線通訊系統包含多個移動終端（MTs)，所述基地台包含： (a) —接收器，用以接收傳輸給所述多個MTs的指定下行資料 區塊；以及
(b) —傳輸器，用以針對各MT傳輸一請求，以便因應接收傳 ，給所述多個MTs的指定下行資料區塊而執行一下行頻道品質測 畺’其中所述基地台根據所述接收器接收自所述多個MTS的下行 頻道品質測量而決定哪些MTs將最有效率地使用無線資源，所述 基地台將編碼速率、調變型態以及時槽資訊發送給各Μτ，所述基 地台針對各MT建立一資料轉換優先權，以及所述傳輸器將所指 定的下行資料區塊傳輸至所述多個MTs中的各MT。 8· —種最佳化一無線通訊系統中的下行資料轉換的的基地台，其 中所述無線通訊系統包含多個移動終端（MTs),所述基地台包含： (a) —接收器，用以接收傳輸給所述多個MTs的特定數個MTs 的指定下行資料區塊；以及 ⑻一傳輸器，用以針對所述特定數個MTs的各Μτ傳輸一請 求、，以便執行一下行頻道品質測量，其中所述接收器更接收來自 所述特定數個MTs的各MT的請求下行頻道品質測量，所述基地 台=在所述特定數個MTs中可最充分地_多個無線資源的數 個毹先MTs，所述基地台配置所述優先MTs*使用的時槽， 所述傳輸器在所麵定數個MTs回應所骑求之後，根據 的時槽2將所指定的下行資龍塊傳輸至所麟定數個ML : Hi佳化一無線通訊系統中的下行資料轉換的的基地台，並 中所述,、、、線通訊系統包含多個移動終端（MTs )，所述基地 二 ⑻一傳輸器；以及 口匕3· (t〇二接收器’用於接收傳輸到所述多個MTs中的 MTs、曰疋下仃貧料區塊’其中所述基地台回應接收自所述特定 ‘1301362 數個MTs的下行頻道品制量決定在所述特定數個MTs中可 分地利用多個無線資源的數個優先MTs，所述基地台根據所= 行頻道品質測量以及能傳輸至所述特定數個MTs的下行資料二， 配置一特定數量的時槽給所述數個優先MTs ;以及所述傳輪二 據所配置的賴而將所指定的下行資料區塊傳輸至所述特定^ MTs °
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