TWI391018B - 藉由確認抑制之增強資訊量 - Google Patents

藉由確認抑制之增強資訊量 Download PDF

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TWI391018B
TWI391018B TW094138836A TW94138836A TWI391018B TW I391018 B TWI391018 B TW I391018B TW 094138836 A TW094138836 A TW 094138836A TW 94138836 A TW94138836 A TW 94138836A TW I391018 B TWI391018 B TW I391018B
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acknowledgement
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TW200637386A (en
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William S Kish
John Chanak
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Ruckus Wireless Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)

Description

藉由確認抑制之增強資訊量
本發明大體上係關於通訊網路，且更特定言之係關於用於在諸如無線網路之通訊網路上的增加之資料資訊量的系統及方法。
一參考模型可便利地表示在形成網路之設備之間的通訊。圖1說明根據先前技術之在開放系統互連(OSI)參考模型之層與防護領域(DoD)參考模型之層之間的一相互關係。防護領域(DoD)模型與開放系統互連(OSI)模型為熟習此項技術者所熟知之兩個標準參考模型。
此等參考模型將通訊表示為在階層架構之較高層與較低層協定中發生的過程。一般而言，每一層與一較高層協定及一較低層協定通訊。如由圖1所指示之，DoD模型包括四層：一網路存取層、一網際網路層、一主機對主機傳送層(傳送層)，及一應用層。
圖2說明根據先前技術之在兩個網路設備通訊期間DoD參考模型中之各層處的實體及虛擬資料流。第一網路設備中的每一層與第二網路設備中的對應層通訊。此等層之間之通訊藉由虛線表示，其中第一網路設備處之連續之較低層協定中的資訊嵌入藉由層間之向下箭頭表示，且第二網路設備處之連續之較高層協定中的資訊之拆封藉由層間之向上箭頭表示。
舉例而言，傳送層(意即，較高層協定)中之網路設備之間的通訊嵌入每一設備之網際網路層(意即，對於傳送層協定而言之較低層協定)的通訊中。最終在參考模型之階層構架中以最低層協定進行實體資料傳送。在DoD網路參考模型中，最低層協定為網路存取層。
網路存取層包含媒體存取控制服務及協定(其附著實體源及目的地位址，例如，乙太(Ethernet)網路位址及控制協定)，及例如銅電纜之實體媒體或諸如調變類型之RF規格。為達成由多個不同供應商所製造之設備之相容性及互用性，通訊網路通常依網路存取層之標準規格而定。在一實例中，電機電子工程師學會(IEEE)802群組在1997年確立了規定用於無線通訊之媒體存取(MAC)服務、協定，及RF實體層的802.11無線標準。現今此協定廣泛使用於無線網路中。舉例而言，在IEEE 802.11網路中，一存取點(例如，一基地台)在諸如射頻(RF)基頻無線鏈路之一無線鏈路上與一遠端接收節點(例如，諸如與一網路介面卡組態之一膝上型電腦之行動台)通訊資料。
一般而言，無線傳輸較其它形式之資料傳輸對資料丟失更為靈敏。無線傳輸由於諸如干擾、訊號衰減，及無線電訊號之多路反射之問題而變得不可靠。舉例而言，802.11b及802.11g無線區域網路(LAN)藉由2.45 GHz頻帶通訊，此頻帶通常具有與行動電話、微波烘箱及其它802.11網路之干擾輻射。為解決此問題，802.11規格包含致能不管干擾之存在之可靠通訊的機制。
在本文中，若協定對接收節點已接收資料提供驗證，則傳輸協定為"可靠"的。一802.11無線存取點藉由一機制而提供與相關聯之接收節點之可靠通訊，此機制具有802.11確認(ACK)。在成功接收之後，由接收節點經由一802.11ACK確認單播802.11封包。若存取點在一組週期內未偵測到802.11 ACK，則假定單播802.11封包已丟失此封包，因此由存取點重傳此封包。然而，藉由實施一可靠之較低層協定，因為對成功地接收單播802.11封包而言，傳輸802.11 ACK作為回應，所以802.11 ACK之傳輸限制在通訊網路上之資料傳輸速率。
當在諸如無線網路之提供可靠之較低層協定的一通訊網路上實施傳輸時，實施可靠傳輸之較高層協定潛在地進一步限制資料傳輸率。舉例而言，DoD參考模組之傳送層通常包括在發送器與接收器之間交換資料之諸如TCP之可靠連接導向協定。TCP使用若干機制確保發送器與接收器(意即，源與目的地)之間之資料服務的可靠傳遞。在自發送器傳輸預定量之資料至接收器之後，發送器必須等待傳送層中之自接收器返回之一TCP確認(ACK)以確定已接收資料。不允許發送器傳輸額外資料直至其接收此確認，且若發送器在一預定時間內未接收到此ACK，則其必須重傳此資料。
圖3說明根據先前技術之用於自一源310傳輸至一接收節點330之TCP資料350的TCP傳輸及802.11確認。源節點310在一有線網路300上傳輸TCP資料350至一存取點320。接著，存取點320在一無線鏈路340上傳輸TCP資料350(例如，在一802.11封包中封裝)至接收節點330。若接收節點330成功接收TCP資料350，則接收節點330傳輸一802.11ACK 360至存取點320。
接著，接收節點330經由存取點320傳輸一TCP ACK 370至源310。存取點320藉由另一802.11 ACK 380確認TCP ACK 370之接收。最終，存取點320傳輸TCP ACK 370至該源310。
因此，因為在802.11無線LAN中發送多個確認(意即，TCP ACK及802.11 ACK)以確認相同通訊(意即，TCP資料350)之接收，所以此802.11無線LAN中TCP ACK(意即，TCP ACK 370)特定地負荷沉重。諸如一IEEE 802.11網路之無線網路可提供例如54 Mbps之相對高之最大實體資料速率。然而，因為TCP封包標頭及其它協定內容在無線鏈路上與應用層資料一起傳輸，所以，實務上對應於實體IEEE 802.11g網路設備之間之54 Mbps實體傳輸速率的TCP資料傳送速率僅約為24 Mbps。因此，協定耗用包含應用層資料速率之約50%。
另外，在TCP源與TCP目的地之間之資料傳輸通常為單向的。舉例而言，諸如網頁瀏覽器之應用通常自遠端網站接收大量資料而發送回少許資料或不發送回資料至網站。相應地，TCP資料傳輸通常在短間隔內為單向的，且自接收器至發送器之TCP ACK通常不載運TCP資料。
一個限制在於：當不存在自接收器至發送器之實際TCP資料傳送時，用於自接收器發送TCP ACK至發送器之協定耗用對實體通訊通道造成負擔。此外，通常為每一TCP ACK重複大量此耗用。結果，用於發送802.11資料封包之大量時間被發送不具有附隨TCP資料及附隨802.11 ACK之經封裝之TCP ACK所佔用。多個TCP ACK及802.11 ACK增加在通訊網路上之網路通訊量且限制資料傳送之頻寬。
本發明提供藉由確認抑制之增強資訊量之系統、設備及方法。一方法包含：根據一較高層協定藉由一在一源與一目的地之間的中間設備自源傳輸資料至該目的地；根據一較低層協定自該目的地傳輸一第一確認至該中間設備；且根據該較高層協定基於該第一確認自該中間設備傳輸一第二確認至該源。該目的地可包含一無線網路之一節點。該中間設備可包含該無線網路之一存取點。
在某些實施例中，該較高層協定包含TCP、一可靠連接導向協定，且該第二確認包含一TCP ACK。該較低層協定可包含一802.11協定，且該第一確認包含一802.11 ACK。
另一方法包含：根據一較高層協定自一源傳輸資料至一目的地；根據一較低層協定自一在該源與該目的地之間的中間設備傳輸一第一確認至該源；根據該較高層協定自該目的地傳輸一第二確認至該中間設備；且在該中間設備處抑制該第二確認。在某些實施例中，該源包含一無線網路之一節點。該中間設備可包含一無線網路之一存取點。在某些實施例中，抑制該第二確認包含不傳輸該第二確認至該源。
本發明之又一方法包含：根據一較高層協定藉由一在一源與一目的地之間的中間設備自該源傳輸資料至該目的地；根據一較低層協定自該中間設備傳輸一第一確認至該源；且根據該較低層協定自該目的地傳輸一第二確認至該中間設備。
進一步提供諸如一存取點之一無線區域網路(LAN)設備。該設備包含邏輯，其經組態以根據一較高層協定自一源傳輸資料至一目的地、根據一較低層協定自該目的地接收一第一確認，且根據該較高層協定基於該第一確認傳輸一第二確認至該源。在此等實施例中，可以硬體、軟體，及韌體元件之任意組合實施該邏輯。在某些實施例中，該設備進一步經組態以廣播一信標，其通告基於802.11確認產生TCP確認的能力。
本發明之另一無線LAN設備包含邏輯，其經組態以根據一較高層協定自一源接收資料、根據一較低層協定傳輸一第一確認至該源，且回應於接收該資料而不發送一較高層協定確認至該源。在某些實施例中，無線LAN設備包含一接收節點。與無線LAN設備通訊之源可包含一存取點。
本發明針對藉由減少確認傳輸而改良通訊網路中之資料傳輸速率的方法，且針對經組態以致能該等方法之系統及設備。具體言之，在一例示性無線網路中，當無線網路之一節點在一無線鏈路上傳輸TCP資料至一目的地時，若802.11 ACK足以通知節點目的地已適當地接收了TCP資料，則不在無線鏈路上發送不含資料或其它旗標位元的TCP確認(ACK)。若TCP資料發源於無線網路之外且將發送至一在無線網路內部之目的地，則該目的地抑制該TCP ACK且該無線網路之一存取點發送該TCP ACK至發源站。若TCP資料發源於無線網路內部且將發送出無線網路之外，則無線網路之存取點抑制該TCP ACK。若TCP資料將在無線網路中之節點之間發送，則存取點與目的地節點抑制TCP ACK。因此，本發明之某些實施例提供適當時經組態以選擇性地抑制TCP ACK之存取點及無線節點。
圖4說明根據本發明之一實施例之一例示性無線區域網路(LAN)設備400，其包含一天線裝置410及一802.11g RF通訊裝置420。舉例而言，該無線LAN設備400可為一傳輸器及/或一接收器，諸如一802.11存取點、一視訊轉換器、一膝上型電腦、一電視、一PCMCIA卡、一遙控器，及一諸如一掌上型遊戲設備之遠端終端。在一例示性實施例中，無線LAN設備400包含一存取點，其用於在一無線鏈路(例如，802.11無線網路中之TCP/IP)上(未圖示)通訊至一或多個遠端接收節點。
通常，無線LAN設備400自連接至網際網路之一路由器(未圖示)接收資料，且無線LAN設備400經由無線鏈路與一或多個遠端接收節點(未圖示)交換資料。無線LAN設備400亦可藉由致能該或該等遠端接收節點之間之通訊而形成無線LAN之一部分。儘管揭示內容聚焦在無線LAN設備400之特定實施例上，但本發明之態樣可適用於多種經由通訊網路交換資訊之設備，且並非意欲受限於所特定揭示之實施例。
在一實施例中，無線LAN設備400包括天線裝置410、802.11g RF通訊裝置420(例如，一收發器)，及一執行軟體以控制通訊裝置420及/或天線裝置410的處理器(未圖示)。通訊裝置420基本上可為用於產生及/或接收RF訊號之任何設備。舉例而言，通訊裝置420可包括(例如)一無線電調變器/解調器，其用於將接收至無線LAN設備400(例如，自路由器)中之資料轉換為用於傳輸至一或多個遠端接收節點的RF訊號。在某些實施例中，通訊裝置420包含用於自路由器接收視訊資料封包之電路及用於將該等資料封包轉換為符合802.11之RF訊號之電路。另外，本發明之原則應用於具有單一訊號天線的存取點或具有兩個全向"鞭狀"天線的存取點。
圖5說明根據本發明之一實施例之用於自一源510傳輸至一接收節點530之TCP資料550的TCP傳輸及802.11確認。一有線網路500連接源510至一存取點520(例如，諸如圖4之無線LAN設備400)。一無線網路540連接存取點520至接收節點530。在設備510、520及530之圖示下方示意性地說明源510、存取點520與接收節點530之間之資料交換。
源510傳輸目的地為接收節點530之TCP資料550。為達到接收節點530，源510在有線網路500上傳輸TCP資料550至存取點520。在一實例中，諸如802.3乙太網路之一不可靠有線網路存取協定可用於經由有線網路500傳輸TCP資料550。
在存取點520將TCP資料550轉換為802.11訊框之後，存取點520傳輸包含TCP資料550之802.11訊框至接收節點530。隨後，接收節點530傳輸一802.11 ACK 560至存取點520。存取點520一接收802.11 ACK 560就具有足夠資訊以判定接收節點530無誤地接收TCP資料550。接著，存取點520在有線網路500上傳輸TCP ACK 570至源510。
存取點520有利地提供：若存取點520接收到802.11 ACK 560，則接收節點530無誤地接收了TCP資料550。相應地，存取點520及接收節點530不交換TCP資料550之多個ACK。因此，根據一實施例，接收節點530不發送一TCP ACK以確認TCP資料550。在某些實施例中，接收節點530產生TCP ACK，但接收節點530經組態以抑制TCP ACK以較低層協定傳輸。在其它實施例中，接收節點530經組態以不產生TCP ACK。不發送TCP ACK釋放無線鏈路540用於其它傳輸。
儘管圖5中所展示之實施例之解釋係依據自源510發送至接收節點530之TCP資料，但是當自接收節點530藉由存取點520發送TCP資料至源510時存在類似問題。因此，根據一實施例，當自接收節點530經由無線鏈路540傳輸TCP資料至存取點520時，返回至接收節點530之一802.11 ACK足以通知接收節點530存取點520已接收TCP資料。
接著，在有線網路500上將TCP資料發送至源510。接著，源510返回一TCP ACK至存取點520。接著，藉由存取點520抑制自源510之TCP ACK。回應於所接收之TCP ACK而在存取點520處抑制TCP ACK可有利於防止TCP ACK傳輸至接收節點530且防止另一802.11 ACK自接收節點530隨後傳輸回至存取點520。
一般而言，在一TCP網路中，自預期目的地合成("仿冒(spoof)")一TCP ACK之一代理伺服器必須負責傳遞TCP資料至預定目的地。一般而言，代理伺服器("仿冒器")有必要保留TCP資料直至已目的地已接收且確認該TCP資料。源一接收到目的地已接收TCP資料之確認就可自其傳輸緩衝器刪除該TCP資料。因此，當源在實際地發送資料至目的地之前自代理伺服器接收一仿冒TCP ACK時，源可如同已實際地發送資料一樣繼續。一般而言，經仿冒之TCP ACK允許發送器發送更多資料至代理伺服器。
在此意義上，圖5之系統通常經組態以使用802.11 ACK用作代理伺服器之TCP ACK。減少在無線鏈路540上發送之TCP ACK之數目改良越過無線鏈路540之TCP資料資訊量。可認為存取點520及接收節點530包含一分散式代理伺服器。
在一實施例中，在最初結合期間存取點520及接收節點530交握以便致能TCP ACK之抑制且致能存取點520基於自接收節點530之802.11 ACK仿冒至源510之經抑制之TCP ACK。最初結合包括在存取點520與接收節點530之間之一資訊交換，以便(以實例)表明存取點520能夠支持54 Mbps之實體層速率通訊。
在另一實施例中，存取點520廣播一信標，其通告存取點520基於802.11ACK產生TCP ACK的能力。若接收節點530選擇使用此能力增加無線鏈路540上之TCP資料傳輸之容量，則接收節點530將在發送至存取點520之802.11結合請求中訊號傳輸此能力。此後，接收節點530及存取點520可協作地抑制發源於接收節點530或源510中之傳送層的TCP ACK。
在成功完成802.11結合訊號交握之後，藉由如上文所描述之自802.11 ACK仿冒TCP ACK將抑制包含越過無線鏈路540傳輸之所有TCP通訊中之TCP ACK的無線802.11訊框。此訊號交握之益處在於存取點520可區別不支持TCP ACK抑制之接收節點(未圖示)與支持TCP ACK抑制之接收節點530。藉由抑制TCP ACK，802.11g網路中的TCP資料傳輸容量較先前技術之容量可改良30%。在某些實施例中，在54 Mbps之802.11g實體資料速率模式下之實際資料資訊量自24 Mbps增加至30 Mbps。
在某些實施例中，即使存取點520及接收節點530具有抑制能力，暫停TCP ACK抑制為有利的。舉例而言，當自接收節點530經由存取點520傳輸一TCP資料流至源510時，存取點520可緩衝TCP資料流直至存取點520接收了由源510返回至接收節點530的TCP ACK。為了持續存取點520與接收節點530之間的TCP ACK抑制，存取點520可能要求非常高容量之緩衝器以儲存自接收節點530之經積聚之TCP資料流。詳言之，若自存取點520至源510之TCP資料流(例如)歸因於存取點520與源510之間的一網路問題而中斷了，則將發生此狀況。
在一實施例中，為減小存取點520所要求之之緩衝，存取點520避免抑制TCP ACK即使其具有此能力。在其它實施例中，存取點520僅抑制一限制數量之資料封包的TCP ACK。在某些實施例中，存取點520可降低在無線鏈路540上之資料傳輸速率，或當存取點520中之資料緩衝器變滿時可停止產生802.11 ACK至接收節點530。
圖6說明根據本發明之一實施例之在無線網路的兩個節點之間之TCP傳輸及802.11確認。一有線網路600連接一源610至一存取點620。一無線鏈路650連接該存取點620至一接收節點630。一無線鏈路660連接該存取點620至一接收節點640。在設備620、630及640之圖示下方示意性地說明在該等接收節點630及640與該存取點620之間之資料交換。
存取點620可緩衝接收節點630與接收節點640之間的TCP資料。存取點620亦可運作為接收節點630與接收節點640之間之代理伺服器。當存取點620僅運作為緩衝器時，接收節點630傳輸TCP資料670至存取點620。接著，存取點620返回一802.11 ACK 680至接收節點630以確認TCP資料670之接收。接著，存取點620傳輸TCP資料670至接收節點640。接收節點640傳輸一802.11 ACK 690至存取點620。在此情況下，與先前技術相比，在存取點620與接收節點630之間、且在接收節點640與存取點620之間消除了一TCP ACK及一802.11 ACK。
如本文所描述之，存取點620可起作用以防止存取點620中之資料緩衝器之溢出。存取點620可完全地暫停與接收節點630及655 TCP ACK之抑制。或者，存取點620可運作為接收節點630與接收節點640之間之代理伺服器。在此運作模式下，存取點620基於自接收節點640接收之802.11 ACK 690產生一自接收節點640至接收節點630之TCP ACK。存取點620傳輸經仿冒之TCP ACK至接收節點630。存取點620可基於緩衝器之充滿程度進一步緩和資料傳輸速率及TCP ACK抑制。
一般而言，存取點620不可抑制包含除確認(ACK旗標設定)之外之資料的TCP區段。此外，在某些實施例中，存取點620不可抑制包含三個部分之"交握"之TCP區段，該三個部分之"交握"起始化一TCP連接(僅具有合成(SYN)旗標設定之第一TCP區段，繼之以具有旗標SYN及ACK設定兩者之第二回復TCP區段，以及接著確定SYN/ACK回復之接收的第三TCP ACK)。在某些實施例中，並不抑制包括某些TCP控制旗標(例如，緊急指標欄位(URG)、不再合成資料(SYN FIN)，及復位連接(RST)旗標)之TCP區段。然而，並非所有TCP實施為相同的，且在某些實施例中可抑制包含此等旗標或資料之經選定之區段。
儘管已相對於802.11無線協定描述本發明，但本發明之原則亦可應用以基於支持可靠資料傳輸之任何較低層協定產生一用於可靠較高層協定之確認。另外，儘管已相對於TCP協定描述本發明，本發明亦可應用於支持可靠資料傳輸之任何較高層協定。
舉例而言，再次參看圖5，在一實施例中，源510包括一普通檔案傳輸協定(TFTP)伺服器。該TFTP協定提供一可靠之應用層協定(意即，較高層協定)，該協定通常在使用者資料報協定(UDP)之頂端實施。接收節點530可藉由與TFTP伺服器通訊而自源510請求一檔案。源510藉由存取點520且在無線鏈路540上發送一UDP封包(替代TCP資料550)而發送該檔案至接收節點530。接收節點530一在無線鏈路540上成功接收UDP封包就傳輸802.11 ACK 560至存取點520。
因為UDP協定不提供藉由確認之可靠傳輸，所以接收節點530並未發送一用於UDP封包之ACK。然而，接收節點530可根據TFTP較高層協定發送一TFTP ACK。根據本發明之原則，因為已經發送802.11 ACK 560，所以接收節點530可抑制TFTP ACK之傳輸。接著，存取點520可發送一TFTP ACK(替代TCP ACK 570)至源510以確認檔案之接收。有利地，存取點520可基於較低層協定確認(例如，802.11 ACK 560)產生一較高層協定確認(例如，TFTP應用層ACK)。
在以上之說明書中，參考本發明之特定實施例描述本發明，但彼等熟習此項技術者將認識到本發明不限於此。可個別地或聯合地使用上文描述之本發明之多種特徵及態樣。此外，在不偏離本說明書之較廣泛之精神及範疇的情況下可在除本文所描述之彼等環境及應用之外之任何數目的環境及應用中利用本發明。因此，認為本說明書及圖示為說明性的而非限制性的。應認識到本文所使用之該等術語"包含"、"包括"及"具有"特定地意欲理解為技術之開端術語。
300,500,600．．．有線網路
310,510,610．．．源/源節點
320,520,620．．．存取點
330,530,630,640．．．接收節點
340,540,650,660．．．無線鏈路
350,550,670．．．TCP資料
360,380,560,680,690．．．802.11確認
370,570．．．TCP確認
400．．．無線LAN設備
410．．．天線裝置
420．．．RF通訊裝置
圖1說明根據先前技術之開放系統互連(OSI)參考模型之層與國防部(DoD)參考模型之層之間的相互關係；圖2說明根據先前技術之兩個網路設備通訊期間在DoD參考模型中的多個層處的實體及虛擬資料流；圖3說明根據先前技術之用於自一源傳輸至一接收節點之TCP資料的TCP傳輸及802.11確認；圖4說明根據本發明之一實施例之一例示性無線區域網路設備；圖5說明根據本發明之一實施例之用於自一源傳輸至一接收節點之TCP資料的TCP傳輸及802.11確認；且圖6說明根據本發明之一實施例之用於在無線網路之兩個接收節點之間所傳輸的TCP資料之TCP傳輸及802.11確認。
500．．．有線網路
510．．．源
520．．．存取點
530．．．接收節點
540．．．無線鏈路
550．．．TCP資料
560．．．802.11確認
570．．．TCP確認

Claims (20)

  1. 一種用於可靠資料傳輸的方法，其包含：根據一較高層協定經由一在一源與一目的地之間之中間設備自該源傳輸資料至該目的地；根據一較低層協定，接收自該目的地傳輸至該中間設備之一第一確認；及根據該較高層協定基於該第一確認自該中間設備傳輸一第二確認至該源，藉此增加可靠資料資訊量而不延遲傳輸確認至該源。
  2. 如請求項1之方法，其中該目的地包含一無線網路之一節點。
  3. 如請求項1之方法，其中該較高層協定包含TCP且該第二確認包含一TCP ACK。
  4. 如請求項1之方法，其中該較低層協定包含一802.11協定且該第一確認包含一802.11 ACK。
  5. 如請求項1之方法，其中該中間設備包含一無線網路之一存取點。
  6. 一種用於自一源至一目的地之可靠資料傳輸的方法，其包含：根據一較高層協定自該源傳輸資料至該目的地；根據一較低層協定，接收自一在該源與該目的地之間之中間設備傳輸至該源之一第一確認；根據該較高層協定自該目的地傳輸一第二確認至該中間設備；及 抑制該中間設備處之該第二確認，藉此使得自該源至該目的地之資料傳輸為可靠的且不延遲傳輸確認至該源。
  7. 如請求項6之方法，其中該源包含一無線網路之一節點。
  8. 如請求項6之方法，其中該較高層協定包含TCP且該第二確認包含一TCP ACK。
  9. 如請求項6之方法，其中該較低層協定包含一802.11協定且該第一確認包含一802.11 ACK。
  10. 如請求項6之方法，其中該中間設備包含一無線網路之一存取點。
  11. 如請求項6之方法，其中抑制該第二確認包含不傳輸該第二確認至該源。
  12. 一種用於自一源至一目的地之可靠資料傳輸的方法，其包含：根據一較高層協定經由一在該源與該目的地之間之中間設備自該源傳輸資料至該目的地；根據一較低層協定，接收自該中間設備傳輸至該源之一第一確認；及根據該較低層協定自該目的地傳輸一第二確認至該中間設備，藉此使得自該源至該目的地之資料傳輸為可靠的且不延遲傳輸確認至該源。
  13. 如請求項12之方法，其中該源包含一無線網路之一節點。
  14. 如請求項12之方法，其中該較高層協定包含TCP且該第二確認包含一TCP ACK。
  15. 如請求項12之方法，其中該較低層協定包含一802.11協定且該第一確認包含一802.11 ACK。
  16. 一種包含邏輯之無線區域網路設備，其經組態以：根據一較高層協定自一源傳輸資料至一目的地；根據一較低層協定，接收傳輸自該目的地之一第一確認；及根據該較高層協定基於該第一確認傳輸一第二確認至該源，藉此使得資料傳輸為可靠的且不延遲傳輸確認至該源。
  17. 如請求項16之無線區域網路設備，其中該設備為一存取點。
  18. 如請求項17之無線區域網路設備，其中該設備包含一天線裝置及一RF通訊裝置。
  19. 如請求項18之無線區域網路設備，其中該RF通訊裝置包含一802.11g RF通訊裝置。
  20. 如請求項16之無線區域網路設備，其中該設備進一步經組態以廣播一信標，該信標通告一基於802.11確認產生TCP確認的能力。
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