LTE-A隨機接入程序

LTE-Advanced Random Access Procedure

林柏志(Po-Chih Lin)

指導教授 ： 劉玉蓀

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00591

摘要

當手機想要與基地台做存取資源的時候，必須要先經過隨機接入程序(Random Access procedure)。而隨機接入程序有兩種個別為，競爭型隨機接入程序，非競爭型隨機接入程序，而本論文研究競爭型隨機接入程序模擬。競爭型隨機接入程序共有4個步驟，首先第一步，會由使用者(UE)自行選擇Preamble (Msg1)以上行RACH傳送給基地台，Preamble與上行RACH的選擇範圍是由基地台配置，只能在基地台所規定配置的位置上傳。第二步由基地台以下行DL-SCH回覆使用者Response (Msg2)，Response裡提供使用者上行資源。第三步(Msg3)由使用者以Msg2提供的上行資源傳送給基地台，告知基地台接入的目的或需求。最後一步則由基地台以DL-SCH或PHY層的DCI發送競爭消除消息(Msg4)告知是否讓使用者進入網路。第一步與第二步中我們可以看到基地台供給使用者資源配置，但當我們改變資源配置參數時，將不知道會對使用者造成什麼影響。本論文改變使用者競爭資源的方式，並可以用數學模型畫出圖形，可以快速地看出改變參數會對使用者的影響，第三章我們分析出改變資源配置參數對使用者有什麼影響。

關鍵字

LTE-A ； MAC層 ； PHY層 ； 隨機接入程序

並列摘要

When the cell phone want to access the resource with the base station, it must be use Random Access procedure. And there are two kind of Random Access procedure. One is competitive Random Access procedure, another is non-competitive Random Access procedure, and we absorbed in competition Random Access procedure. Competition Random Access procedure a total of four steps, the first step user (UE) will to choose Preamble (Msg1) and transmission to the base station on uplink RACH, Preamble and uplink RACH is configured by the base station. The second step is base station Response(Msg2) to User on downlink DL-SCH, Response provide users uplink resources. The third step (Msg3) user send access purposes or needs to base station on uplink resource. The last step from the base station send messages (Msg4) to user whether access the network or not. The first step and the second step, we can see that the base station is supply resource, but when we change the resource configuration parameters, it will be does’t know what impact on users. This thesis use different compete the resources, and we can use the mathematical model draw graphics, you can quickly see that changing the parameters will affect to users, the third chapter, we analyze the change resource configuration parameters have any effect to users.

並列關鍵字

LTE-Advanced ； MAC Layer ； PHY Layer ； Random Access Procedure

參考文獻

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[2] 3GPP TS 36.321, “Medium Access Control (MAC) Protocol Specification,” V10.0.0, Jan. 2011.

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