TWI408978B - 在行動通信系統中用於遞交控制之方法及裝置 - Google Patents
在行動通信系統中用於遞交控制之方法及裝置 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00835—Determination of neighbour cell lists
- H04W36/008357—Determination of target cell based on access point [AP] properties, e.g. AP service capabilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Description
本發明廣泛地關於一無線網路中回程段(backhaul)與旁程段(sidehaul)鏈路負載之平衡。
行動通信網路利用複數個基地台以連接行動通信用戶台至一無線網路。當各個行動通信用戶台位於由一基地台所服務之一小區區域中時,其最初與該基地台通信藉以與該無線網路交換資訊。然而,當該等行動通信用戶台在小區之間實體移動或當目前服務中的基地台在服務其他行動通信用戶台經歷擁塞時,該等行動通信用戶台上建置之連接經常必須遞交至不同基地台。
在該等行動通信用戶台上所建置之連接通常從一基地台遞交至另一個基地台基於(a)無線電存取網路狀態/資源可用度與(b)該行動通信用戶台之移動。該端點對端點應用效能係根據空中介面可達成效能與該等基地台所連接的網路(包括該回程段至該核心網路)。藉由下一世代網路能夠提供之寬頻無線速度,該端點對端點效能的瓶頸可轉移至該回程段網路,導致較慢的連接服務與較高的斷訊可能性。
一般而言,根據此等各項具體實施例,最小化該等存在於一基地台與一核心通信網路間之回程段瓶頸會影響一行動用戶台從一基地台遞交至另一基地台。該行動用戶台可能包含,例如一行動電話。該行動用戶台之遞交行為利用"旁程段"通信(即從一基地台直接通信至另一基地台),藉以決定一適合基地台之遞交候選且考慮該"回程段"的通信狀態,即自該基地台至該核心網路之通信,進而改善整體端點對端點的效能並降低行動服務之等待時間。
藉由一途徑,該網路中之某些/所有基地台皆維護一相鄰基地台的清單。該清單包含有關介於相鄰基地台與該核心網路之間的回程段擁塞資訊。該相鄰基地台之回程段擁塞的附屬資訊可直接從該等相鄰基地台獲得,代替或另外從該核心網路獲得該資訊。基於該清單,一經歷回程段瓶頸之基地台基於預定準則明斷地自一行動用戶台遞交至少一連接至至少一相鄰基地台直到該瓶頸減弱。另一替代為,該基地台可維護與行動用戶台建置一連接之相鄰基地台之優先排序清單,甚至可能在任何回程段瓶頸發生之前遞交。
圖1繪示根據本發明一項具體實施例之一行動用戶台100與一基地台105處於通信狀態中。如上述所討論,該行動用戶台100可包含,例如一行動電話。當經由該行動用戶台100建置一連接時,該行動用戶台100與該基地台105通信。當該連接建置時,發送音訊資料於該行動用戶台100與該基地台105之間。該基地台105亦與一核心網路110通信。該核心網路110可能包含,例如第三世代(3G)網路元件。從該基地台105發送該音訊資料通過該核心網路110並抵達其最終目的地,其可係(例如)與另一行動用戶台通信的另一基地台。
當該行動用戶台100實體位於該基地台105小區之中時(即其服務區域),該行動用戶台100可與該基地台105通信。然而,在相同地理區域中經常存在複數個具有重疊小區覆蓋範圍的基地台。因此,與該行動用戶台100所建置之一連接經常可藉由此基地台105或位於相同地理區域之另一基地台來處理。
各個基地台具有一有限的回程段頻寬量藉以與該核心網路110通信。因此,在達到該回程段頻寬限制之前,該基地台105可同時服務有限的連接數量並且不利地影響該等既存之連接服務。本發明一項具體實施例藉由在行動用戶台100所建置的連接從一基地台選擇性地遞交至另一者,以降低一忙碌中基地台之回程段擁塞,使得更有效使用一組基地台。各個基地台從該等相鄰基地台自身及/或直接從該核心網路110獲得關於相鄰基地台的資訊,然後當回程段瓶頸升高時選擇性地遞交行動用戶台110至相鄰基地台。
另一替代為,即使一回程段瓶頸不存在,基於該可用回程段頻寬量,從可用的基地台中選擇欲將一已服務之連接遞交至其的相鄰基地台(即遞交該連接至一具有相對低量之回程段訊務的相鄰基地台)。
圖2繪示根據本發明一項具體實施例之一通信網路200。如圖所示,該通信網路包含基地台A 205、基地台B 210、基地台C 215、與基地台D 220。雖然僅繪示四個基地台,但是熟悉此項技術者應了解,該通信網路中可能利用許多額外基地台。各個基地台A 205、B 210、C 215、與D 220係與該核心網路110處於通信狀態中。發送包含音訊資料、相鄰基地台的識別等等的資訊於(例如)基地台A 205與該核心網路110之間。資訊係分別經由相對應之回程段鏈路225、230、235、與240發送於各個基地台與該核心網路之間。
藉由此等教示,該等基地台彼此之間亦相互傳達資訊。例如,基地台A 205可能經由旁程段鏈路245與基地台B 210通信,而基地台C 215經由旁程段鏈路250與基地台D 220通信。各個基地台提供無線服務至一相對應小區區域。例如,基地台A 205提供無線服務至小區255、基地台B 210提供無線服務至小區260、基地台C 215提供無線服務至小區265、基地台D 220提供無線服務至小區270。
各個基地台各自維護一相鄰基地台清單與各個相鄰基地台所利用的技術重複範圍。例如,該等基地台其中之一可能經由一微波存取全球互通(WiMAX)網路通信,而一相鄰基地台可能經由一分碼多向近接(CDMA)網路通信。因此,該清單包含關於該基地台的技術資訊為各特定相鄰基地台之重複範圍。在例如當該基地台正經歷一回程段瓶頸時將一行動用戶台100移交至一相鄰基地台時,即利用該相鄰基地台清單。該相鄰基地台清單可根據最佳遞交候選來分類該等相鄰基地台。
在各個該等基地台A 205、B 210、C 215、與D 220,在同一特定時間可服務複數個連接。若同時有過多連接服務在(例如)基地台A 205上,則該基地台A 205至該核心網路110之回程段將成為擁塞或過載。因此,該等各個連接之服務可能會變慢或某些該等連接可能中斷。換而言之,在一既定基地台之回程段訊務越大,該基地台在適當處理/服務一額外行動單元計畫進而以附接至該基地台時會更可能經歷困難。欲避免此問題,正在經歷擁塞的基地台可遞交一行動用戶台100或多個行動用戶台100至一相鄰基地台或多個相鄰基地台。遞交該等一或多個行動用戶台100至何(等)相鄰基地台之決策係基於經由來自相鄰基地台的旁程段鏈路所獲得之資訊而作成。經由該等旁程段鏈路以獲得此資訊,可能獲得關於該潛在遞交候選之正確資訊與維持介於一擁塞基地台與該核心網路間之回程段量在一較佳位準。
圖3繪示根據本發明一項具體實施例之基地台A 205。如圖所示,基地台A 205包含一記憶體300,其中可能已儲存該相鄰基地台清單與各該等基地台之重覆範圍。基地台A 205亦包含一處理器305與該記憶體300處於通信狀態中。其他元件(未顯示於該圖中)包含RF與天線子系統。
當在基地台A 205上之任何回程段鏈路225之擁塞(即使用率)超過一預定臨界(例如80%容量)時,基地台A 205可能推斷該回程段鏈路225係擁塞而嘗試作出正確判斷遞交決策,藉以使訊務遠離該回程段鏈路225進而減輕該問題。當一新的連接嘗試提交至基地台A 205時,其將檢查以決定是否繼續進行基地台A 205上之瓶頸鏈路的訊務。若係肯定,則在經過詢問提交連接分析的優先排序後該提交嘗試將遭拒絕,或決定額外負載基地台A 205之優點不充足,即使基地台A 205具有足夠額外的資源(例如空氣介面資源)可用於服務該連接。
可藉由關連各個/所有目前所有之服務連接的連接識別碼至一基地台如同一集合訊務率,及關連該額外提交候選之負載來評估優點,以檢查來自所有潛在服務訊務的新集合負載是否超過該回程段基地台臨界。
圖4繪示根據本發明一項具體實施例之管理基地台A 205之回程段擁塞的方法。首先,在步驟400,測量基地台A 205至該核心網路110之回程段擁塞。此測量可由圖3所示之處理器305所執行。其次,在步驟405,該處理器305決定該回程段網路擁塞是否超過一預定臨界擁塞位準"臨界A"。例如,如上述所討論,"臨界A"可經設定至回程段鏈路容量之80%若該回程段網路擁塞未超過臨界A,則程序返回至步驟400。然而,若已超過臨界A,處理程序則繼續至步驟410,其中該處理器305決定基地台A 205攜帶何連接並根據預定之指定準則分類該等連接。該預定準則可能包含但不受限於,(a)各特定連接所使用之頻寬,或(b)各個連接之額外付費服務等級。亦可利用另外相關的準則以分類該等連接。
其次,在步驟415,該處理器305決定一適合的基地台藉以遞交正由基地台A 205處置中之具有最高指定連接的行動用戶台。在步驟420,該最高指定連接經遞交至最適合之相鄰基地台。最後,在步驟425,該處理器305決定介於基地台A 205與該核心網路110間之回程段擁塞是否低於一第二臨界,"臨界B"。例如,臨界B可係該回程段鏈路容量之70%使用率。若該回程段擁塞低於臨界B,則程序返回至步驟400。然而,若該回程段擁塞未低於臨界B,則程序返回至步驟415。
因此,如圖4所示之程序減少該基地台A 205的回程段擁塞從高於80%到低於70%。可實行各種保護措施以確保此方法之最佳效能。例如,若基地台A 205正經歷重大回程段擁塞且如圖4所示之方法的效能導致遞交一行動用戶台100至基地台B,則相同行動用戶台100不可遞回至基地台A直到該回程段擁塞維持低於臨界B一預定時段。此保護措施藉由導入一確定的磁滯效應通過該遞交臨界準則以防止一"振盪頻率"問題發生於基地台A 205與210之間(即防止一行動用戶台經頻繁地來回遞送之"乒乓效應")。
另一替代係,該等可用基地台可根據預定之準則優先排序。例如,該具有最大量可用回程段之基地台可經指定為最高優先順序。每當遞交一連接時例如(舉例)當該行動用戶台從一小區移出,該連接經遞交至該具有最高優先順序之相鄰基地台。
在一項替代具體實施例中,可根據一集中的回程段狀態相依遞交決策方法來達成遞交行動用戶台之決策。為了實行此方法,利用一行動單元遞交公用程式(mobile unit handoff utility)、一回程段控制單元、與一基地台控制單元。各個基地台控制單元報告該回程段/旁程段鏈路之負載條件至該回程段控制單元。
該回程段控制單元使用該行動單元遞交公用程式與該基地台控制單元協議將一行動用戶台單元或多個行動用戶單元從一基地台站轉遞至另一基地台站,進而以減輕在該特定回程段鏈路上之回程段資源壓力。如上述所討論,此方法包含介於該兩個控制單元之間的合作。另一替代係,若該遞交程序係經終端機控制,則其將需要介於該終端機與該回程段控制單元之間的資訊交換與協議。
亦可利用該行動控制單元遞交公用程式監視介於一行動用戶單元與該基地台之間的複數個會談。例如,若該行動用戶單元上存在多重會談,由該行動用戶單元引起之擁塞總量基於連接識別碼可表示為一集合負載臨界,如同定義於2004年10月1日局部與都會區域網路802.16TM
IEEE標準第16篇第3.13段:固定寬頻無線存取系統之空中介面。
如上述所討論,一行動用戶單元可自一利用(例如)全球行動通信系統("GSM")的基地台移交至一利用802.16之不同基地台,參照上述。因該等基地台具有一相異重複範圍,故此係一"異質"移交,相對於一"同質"移交。
當從一利用某一種技術的基地台遞交一行動用戶單元至一利用不同技術之不同基地台時,即使當空中介面資源存在時該遞交有時可能會遭拒絕。例如,若從一利用GSM的基地台遞交一行動用戶台至一利用802.16e的基地台,即使可能存在充足之空中介面資源,然而若可用於交會(meeting)的回程段無法勝任(如擾動及延時需求)時該遞交可能會遭拒絕。一對應資料欄位可指示該遞交遭拒絕之原因。
熟習此項技術者將認可關於上述說明該等具體實施例可產生一廣泛種類之修正、更改、與合併但不脫離本發明之精神與範疇,而該等修正、更改、與合併皆可視為本發明概念範疇之內。
100...行動用戶台
105...基地台
110...核心網路
205...基地台A
210...基地台B
215...基地台C
220...基地台D
225...回程段鏈路
230...回程段鏈路
235...回程段鏈路
240...回程段鏈路
245...旁程段鏈路
250...旁程段鏈路
255...小區
260...小區
265...小區
270...小區
300...記憶體
305...處理器
附圖進一步說明各種具體實施例且說明全部依據本發明之各種原理與優點,其中遍及分離視圖之相同參考數字表示相同或功能類似之元件且該等附圖與以上詳細說明一起併入本說明書且形成本說明書之部分。
圖1繪示根據本發明一項具體實施例之一行動用戶台與一基地台處於通信狀態中;圖2繪示根據本發明一項具體實施例之一通信網路;圖3繪示根據本發明一項具體實施例之一基地台;以及圖4繪示根據本發明一項具體實施例之管理基地台回程段擁塞的方法。
熟悉此項技術者應瞭解該等圖式中之元件係已簡單及清楚說明而且無須依比例繪製。例如,該等圖式中某些元件的維度相對於其它元件會經誇大藉以協助增進理解本發明之各項具體實施例。並且,不再對商業上可行的具體實施例中有用或必要的通用及易於理解的元件加以說明,從而有利於更清楚地呈現本發明的此等各種具體實施例。
Claims (18)
- 一種行動通信系統,其包含:一第一基地台,其用以服務從一第一組行動通信器件至一通信網路之一第一組連接;一組相鄰基地台,其與該第一基地台通信;其中該第一基地台根據第一預定準則優先排序該第一組連接,以及根據第二預定準則優先排序該組相鄰基地台;以及其中回應介於該第一基地台與該網路之間的一回程段擁塞超過一第一預定臨界位準,該第一基地台遞交該等優先排序連接中之至少一者至該組相鄰基地台中之一基地台,直到該回程段擁塞低於一預定第二臨界位準。
- 如請求項1之行動通信系統,其中回應於該組相鄰基地台中之基地台的回程段可用性不足,拒絕該至少一優先排序連接之遞交,一對應資料欄位指示該拒絕理由。
- 如請求項1之行動通信系統,其中該第一基地台包含一記憶體器件以儲存該組相鄰基地台之一清單,該清單包括一組回程段測量與對應於該組相鄰基地台中之各個基地台的重疊技術。
- 如請求項1之行動通信系統,其中該預定第一臨界位準係大於該預定第二臨界位準。
- 如請求項1之行動通信系統,其中該第一基地台包含一處理器件,其用以偵測介於該第一基地台與該網路之間的該回程段擁塞之量。
- 如請求項1之行動通信系統,其中該第一預定準則係選自由下列各項組成之群中:頻寬使用率與額外收費服務分類。
- 如請求項1之行動通信系統,其中選定該組相鄰基地台之一特定相鄰基地台以接收該至少一遞交連接,使得該特定相鄰基地台之一第二回程段擁塞在該遞交後低於一第三臨界位準。
- 如請求項1之行動通信系統,其中該第二預定準則包含一偵測的可用頻寬量。
- 一種在行動通信系統中用於遞交控制之方法,其包含:在一第一基地台處,服務從一第一組行動通信器件至一通信網路之一第一組連接;決定介於該第一基地台與該通信網路之間的回程段擁塞,以提供已決定之回程段擁塞;回應於該已決定之回程段擁塞係大於一第一預定臨界位準,根據預定準則優先排序該第一組連接,以提供優先排序的連接;以及遞交該等優先排序的連接中之至少一者至一組相鄰基地台中之一基地台,直到該回程段擁塞係低於一預定第二臨界位準。
- 如請求項9之方法,其進一步包含於該第一基地台處儲存該組相鄰基地台的一清單,其中該清單包含一組回程段測量與對應於該組相鄰基地台之各基地台的重疊。
- 如請求項9之方法,其中該預定第一臨界位準係大於該 預定第二臨界位準。
- 如請求項9之方法,其中該預定準則係選自由下列各項組成之群中:頻寬使用率與額外收費服務分類。
- 如請求項9之方法,其進一步包含基於該第一組連接之個別連接識別碼決定回程段擁塞。
- 如請求項9之方法,其進一步包含選擇該組相鄰基地台之一特定相鄰基地台以接收該至少一遞交連接,使得該特定相鄰基地台之一第二回程段擁塞在該遞交後低於一第三臨界位準。
- 一種基地台,其包含:電路,其用以服務從一第一組行動通信器件至一通信網路的一第一組連接;一記憶體器件,其用以儲存一組相鄰基地台之一清單;以及一處理器件,其可操作地耦接至該電路與該記憶體器件,以偵測介於該基地台與該通信網路之間的一回程段擁塞量,且該處理器件經組態與配置以回應介於該基地台與該通信網路之間的回程段擁塞超過一第一預定臨界位準,根據預定準則優先排序該第一組連接,並且遞交至少一優先排序的連接至一組相鄰基地台之一基地台,直到該回程段擁塞低於一預定第二臨界位準。
- 如請求項15之基地台,其中該清單進一步包含一組回程段測量以及對應於該組相鄰基地台中之各基地台的重疊。
- 如請求項15之基地台,其中該預定第一臨界位準係大於 該預定第二臨界位準。
- 如請求項15之基地台,其中該預定準則係選自由下列各項組成之群中:頻寬使用率與額外收費服務分類。
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US8902739B2 (en) * | 2005-05-26 | 2014-12-02 | Alcatel Lucent | Backhaul congestion control for wireless communication networks |
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2006
- 2006-01-31 US US11/343,491 patent/US7848241B2/en not_active Expired - Fee Related
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2007
- 2007-01-19 EP EP07717312.8A patent/EP1982449B1/en active Active
- 2007-01-19 WO PCT/US2007/060735 patent/WO2007089995A2/en active Application Filing
- 2007-01-19 KR KR1020087020344A patent/KR101059356B1/ko active IP Right Grant
- 2007-01-31 TW TW096103452A patent/TWI408978B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
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KR20080095255A (ko) | 2008-10-28 |
KR101059356B1 (ko) | 2011-08-24 |
WO2007089995A3 (en) | 2008-09-25 |
EP1982449A2 (en) | 2008-10-22 |
US7848241B2 (en) | 2010-12-07 |
EP1982449A4 (en) | 2012-12-26 |
WO2007089995A2 (en) | 2007-08-09 |
US20070177510A1 (en) | 2007-08-02 |
TW200803555A (en) | 2008-01-01 |
EP1982449B1 (en) | 2017-03-29 |
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