
abbr. 載波偵聽多路訪問(Carrier Sense Multiple Access)
This paper proposes an algorithm that estimates the communication delay in sensor networks with CSMA/CA communication mechanism.
針對使用CSMA/CA通信機制的無線傳感器網絡提出一種通信延遲估計算法。
For the case that one CSMA/CD system is connected with two gateways, the expressions of equivalent parameters in the equivalence model are derived.
對于一個CSMA/CD 系統與兩個信關相連的情況。 文中推導出了等效模型中各等效參數的表達式。
The Ethernet technology is based on the non-deterministic protocols such as CSMA/CD, which can performance well on office environment due to their big throughput and cheap price.
以太網技術是建立在CSMA/CD這樣的非确定網絡協議基礎之上的,它的優點是可以實現很大的吞吐量,并且軟硬件設備非常廉價。
Wireless data communication based on CSMA protocol, and it realize in firmware program.
無線數據通信的實現是基于CSMA協議,在固件編程有所體現。
Combining with graph coloring algorithm in graph, we propose a distributed adaptive graph- coloring algorithm based on CSMA protocol to reduce reader collisions in the RFID systems.
并在CSMA協議的基礎上,結合圖論中的圖着色方法,提出了自適應的圖着色算法解決射頻識别系統中閱讀器沖突。
According to the principle of CSMA/CD, the author analyses the relation between network throughput and load. The maximum throughput of real network can be calculated.
從CSMA/CD的原理出發,分析了網絡吞吐量和網絡負載之間的關系,并計算出實際網絡最大吞吐量的數值.。
The primary problem of using Ethernet into CNC system is the real-time problem which mainly caused by carrier sense multiple access with collision detection (CSMA / CD) mechanism.
以太網用于數控系統首先要解決的就是實時性問題,而實時性問題主要來源于沖突檢測載波監聽多點訪問(CSMA/CD)機制。
The distance limitation and delay problems encountered in local area networks are eliminated by the use of broadband technology and a hybrid token-CSMA/CD protocol.
由于采用了寬帶技術和總線網令牌與CSMA/CD的混合協議,從而解決了局域網所面臨的距離和時延問題。
Token Bus and hybrid CSMA/Token protocols are exemplified to illustrate the universal applicability of the proposed model.
令牌總線和混合CSMA令牌協議被作為範例演示了該數學模型的普遍適用性。
Based on 802.11PSM, the thesis points out two problems existing in power management for CSMA/CA—energy loss due to overhear and delay of response time for stations in power saving mode.
論文以802.11PSM為基礎,研究發現以CSMA/CA為基礎的功率管理存在兩大問題:意外偵聽造成的能量開銷和省電模式下的收包反應延遲。
Compared with CSMA, the conclusion is MACAM enable the support of multicast servers in MANET because of its reliable data transmission and higher channel utilization.
比較CSMA多播協議,得出結論該協議具有數據傳輸可靠以及較高的帶寬利用率優點,支持MANET網絡中的多播服務。
With a switch, or with a direct cable between two computers, CSMA/CD is unnecessary: the two sides can simply both transmit at the same time.
如果有交換機或直接連接兩台計算機的電纜,CSMA/CD技術就根本沒必要了:雙方同時傳輸數據不會産生任何問題。
The advantages of random channel access technique of the CSMA/CA/CD, of the SWARQ error control and of encoding of constant proportion code were proved by theoretical analysis.
從理論上論證了調度系統采用隨機CSMA/CA/CD信道訪問技術、SWARQ差錯控制方式及各種信息采用等比碼編碼方式的優點。
Methods PCR enzyme digestion was used to perform the survival motor neuron (SMN) genetic diagnosis of 7 patients with CSMA.
方法應用PCR-酶切分析法對7例CSMA患兒進行運動神經元生存(SMN)基因的基因診斷分析。
This paper focuses on the throughput analysis for CSMA-type random access protocol of the distribution computer communication network.
本文運用遍曆平穩隨機過程分析了具有CSMA方式的分布無線多信道計算機通信網吞吐量問題。
Objective To investigate the gene diagnosis of childhood onset spinal muscular atrophy(CSMA).
目的探讨兒童型脊肌萎縮症(CSMA)的基因診斷方法。
Because of its speciality, direct application of the traditional CSMA protocol may cause more collisions, long delay problems and so on.
由于其特殊性,傳統CSMA協議直接應用于無線傳感器網絡中會帶來數據包沖突增加和時延增大等問題。
With the rapid development of DSP technology, CSMA/CA protocal solves the problem of access collision on complicated situation validly and OFDM technology is used widely.
隨着數字信號處理技術的飛速發展,CSMA /CA協議有效解決了複雜環境下的訪問沖突問題,使OF DM技術得到了廣泛應用。
By using OPNET simulation platform, the modeling and simulating technology for channel access protocols based on ALOHA and CSMA/CD were stu***d.
應用OPNET仿真平台,針對ALOHA和CSMA/CD,對信道接入協議的建模仿真技術進行了研究。
This is called full duplex operation, as opposed to half duplex for traditional CSMA/CD operation.
這種方法叫全雙工操作,和傳統CSMA/CD采用的半雙工操作相對。
This scheme uses CSMA/CA for reference and has resolved the problem which exists in the adaptive frequency hopping system, so this scheme will decrease the collisions among users greatly.
它借鑒了CSMA/CA的技術思想,解決了自適應跳頻中存在的無法識别系統内其他用戶幹擾的問題,從而大大降低了跳頻中用戶之間的碰撞。
The simulation results of CSMA/CD deployed as the method of subscriber access and dynamic channel allocation are presented.
最後,對CSMA/CD作為用戶接入機制和實現信道動态分配手段的性能進行了計算機模拟分析。
These algorithms are successful in low load network, such as the CSMA/CD protocol used in Ethernet, but in the high load system, they are no longer adequate.
這些協議被成功應用于負載不高的網絡,如以太網中的CSMA/CD,但在高負載時信道利用率卻很低。
MAC layer and network layer adopt IEEE802.11 protocol and on-demand routing protocol, and improving up CSMA/CA protocol.
MAC層、網絡層分别采用IEEE802.11協議和按需驅動路由協議實現,并對CSMA/CA協議進行了改進。
The proposed protocol is based on CSMA/CA basis. The dynamic channel selection scheme is implemented and the number of the data channel is independent of the network topology.
該協議基于競争的CSMA/CA機制,具有動态的信道分配并且信道數目不依賴于網絡拓撲結構的特點。
Fundamental principles of some multipoint access technologies, such as CSMA and CSMA/CD, are introduced with corresponding performance simulation curves.
介紹了幾種多點接入技術的基本原理,如CSMA和CSMA/CD,并給出了各自相應的性能仿真曲線。
By referring to the classical CSMA/CD protocol, this paper presents an optimized CSMA-SNP/TR protocol, which is of better performance and has been verified both theoretically and experimentally.
在傳統的CSMA/CD協議的基礎上,本文提出了一種性能更佳的優化CSMA-SNP/TR協議,并從理論分析和模拟實驗中得到驗證。
But it is unable to avoid the hidden terminal problem of CSMA due to two hop clustering structure in each cluster.
兩跳的分群結構使得在群内使用CSMA仍無法避免隱藏終端問題。
CSMA(載波偵聽多路訪問,Carrier Sense Multiple Access)是一種用于計算機網絡和通信系統的介質訪問控制協議,其核心機制是通過“先偵聽再發送”的方式協調多個設備對共享信道的訪問。該技術最早可追溯至1970年代的ALOHAnet項目,現已成為以太網和無線局域網的基礎協議之一。
CSMA要求設備在發送數據前先檢測信道是否空閑。若信道被占用,設備會等待隨機時間後重試,這種方式稱為“非持續CSMA”;若持續檢測到空閑則立即發送,稱為“持續CSMA”。這一機制有效減少了多設備同時傳輸導緻的信號沖突,但無法完全避免沖突,因此衍生出兩種改進方案:
CSMA的優勢在于其分布式控制特性,無需中央協調器即可實現多設備高效共享信道。然而,在信道負載較高時,沖突概率顯著增加,導緻吞吐量下降。根據《計算機網絡:自頂向下方法》的定量分析,傳統CSMA/CD的理論最大信道利用率約為37%,而采用分段重傳優化的現代以太網可達90%以上。
目前CSMA/CD仍是千兆以太網的基礎協議(IEEE 802.3z,而CSMA/CA被Wi-Fi 6(802.11ax)等無線标準沿用并優化,支持多用戶多輸入多輸出(MU-MIMO)技術。工業物聯網中的時間敏感網絡(TSN)也借鑒了CSMA的沖突管理機制,以滿足低延遲需求。
CSMA是“載波偵聽多路訪問”(Carrier Sense Multiple Access)的縮寫,屬于計算機網絡中介質訪問控制協議(MAC協議)的一種,主要用于解決多個設備共享同一通信信道時的協調問題。
載波偵聽(Carrier Sense)
設備在發送數據前會先檢測信道是否空閑。若檢測到信道上有其他設備正在傳輸數據(即存在“載波”),則會延遲發送,避免沖突。
多路訪問(Multiple Access)
多個設備可以共享同一物理信道進行通信,通過協議規則實現高效協作。
沖突處理機制
如需更深入的技術細節(如退避算法、幀格式),建議參考計算機網絡教材或IEEE 802.3/802.11标準文檔。
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