[移动通讯]【Carrier Aggregation-3】【5G】

前言：

      参考：

     5G Mobile Communications：《Carrier Aggregation in 5G》

目录：

    1： carrier Allocation Schemes

    2： 网络结构

    3： LTE CA

    4:   5G CA

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一  Carrier Allocation Schemes

     CA  主要作用是增加BandWidth,跟子载波分配方式，主要分为以下三种

   

   比如  Intra-band contiguous:

                         Component carrier is contiguous in BandA

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二  网络结构

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三 LTE CA

    LTE Rel-10 支持5个CA:100M

    LTE Rel-13 支持32 CA: 640M

    接入层支持的版本在前面讲过，在上行OTA UE Capbaility Information 可以看到

    

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四 5G CA

  

    Carrier aggregation (CA) [1] is one of the key features of LTE-Advanced (LTE-A) systems. According to the CA approach, the user equipments (UEs) can access a wider transmission bandwidth by using CA to aggregate a number of individual component carriers (CCs) shaping heterogeneous contiguous and non-contiguous frequency bands.

     These bands can be also unlicensed to the system and therefore a transmission scheme should include sophisticated interference management techniques, according to 3GPP standards [2]. Several new challenging issues arise in radio resource management (RRM) framework for LTE-A systems supporting multipleCC operation, including the selection of the optimal subset of carriers and or the optimal power allocation that maximize the rate of a UE etc.

       The performance of CA over deploying independent carriers is investigated from different aspects in [3]-[6]. Resource allocation schemes are also important for the efficient implementation of a CA scheme. A cross layer approach for carrier selection and power control for the uplink of a CA system is examined in [7]. A greedy algorithm for efficient resource allocation for the downlink case is proposed in [8]. The theoretical analysis and the experimental results in these works show that CA can significantly enhance the system capabilities in user accommodation and throughput.