基于信道借用和信號預(yù)測的切換方法
Channel borrowing and signal prediction priority queuing based handoff scheme
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摘要: 隨著業(yè)務(wù)需求的日益增長,蜂窩也越變越小,移動蜂窩通信環(huán)境中的切換成為日益重要的問題。在CDMA蜂窩系統(tǒng)中使用軟切換,為了解決切換時(shí)的信道短缺問題,提出了許多解決方法。該文中提出了稱為基于信道借用和信號預(yù)測的切換算法。當(dāng)切換請求到達(dá)蜂窩時(shí),如果沒有空閑信道,就將從參與軟切換的靜止呼叫借用一信道,并將借用的信道分配給移動呼叫的切換請求.如果沒有信道可借用,就將切換請求放入隊(duì)列中,使用信號預(yù)測的方法來確定隊(duì)列中的優(yōu)先級。并將此切換方式的性能與其它切換方式進(jìn)行了比較。
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關(guān)鍵詞:
- 信道借用; 用戶移動性; 切換順序; 信號預(yù)測優(yōu)先級排隊(duì)
Abstract: Handoffs in a mobile cellular communications environment will become an increas-ingly important issue as cell sizes shrink to accommodate an increasingly large demand for service. CDMA cellular systems use soft handoff. To cope with the channel shortages, many schemes were proposed. In this paper, a new handoff scheme is proposed that is called the handoff algorithm based on channel borrowing and signal prediction priority queuing. If there is no idle channel when the handoff requests arrive the cell, it will borrow channels from station-ary calls participating in soft handoff and allocate the borrowed channels to handoff requests by moving calls. If there is no channel can be borrowed, it will put handoff requests into queue, using signal prediction priority queuing method. A comparison is made between the performances of the proposed scheme.and other schemes. -
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