Study And Implementation On Function Of RLC Layer In WCDMA Femto

WCDMA is one of the three mainstream standards of the third generation mobilecommunication technologies, which are Derived from the fusion of the widebandCDMA technology in Europe and Japan. WCDMA is a3G technology specification which isbased on the GSM network and have the good compatibility with the GSM network. It inheritsa high degree of standardization and good openness in GSM, and it supports high-speed datatransmission and variable speed transmission. Femto is also known as the home base station. Itis a low transmit power, small-scale coverage, family-oriented application equipment, whichuses the fixed broadband access network as the return trip. The Femto technology asa complement of WCDMA macrocell, which enables the operator to use a lowercost to provide the better wireless broadband voice and data services for the home users.WCDMA radio access layer is divided into the physical layer (L1), data link layer (L2)and network layer (L3)according to function and task. The L2is divided into medium accesscontrol layer (MAC), radio link control layer (RLC), Broadcast/Multicast Control Protocol(BMC) and Packet Data Convergence Protocol (PDCP). This paper will mainly focus on theRLC layer in the data link layer, doing some analysis, design and implementation in view ofthe structure, main function,data processing and other aspects of the RLC layer.Based on3GPP protocol, this paper analyzes and studies how to write codes to designand implement the function of WCDMA Femto RLC layer, using C++in the VxWorks6.8operating system and the Wind River Workbench3.2development platform. Some unit testcases for the various functional modules will be designed for test.Under the premise of ensuring the correct transmission of data, this paper will discuss how toimplement the interaction between the RLC layers and MAC layers, and design rationalmanagement of the three modes entities of the RLC layer. This paper also optimize toachieve the AM entities retransmission mechanisms. Finally, the performance of the RLClayer module will be consummated. It will ensure that data is transmitted quickly andaccurately in the entire WCDMA Femto system, and will meet the requirements of the actualcommunication.