ID	原文	译文
3243	安全性分析表明，基于区块链的可追溯分布式密钥生成属性基加密算法是随机预言机模型下自适应安全的，并通过实验证明了所提方案的可行性和实用性。	The security analysis shows that the traceable distrib-uted key generation attribute-based encryption algorithm based on the blockchain is adaptively secure under the randomoracle model, and through experiments, the feasibility and practicability of the proposed scheme are shown.
3244	针对基于网络编码的协作恢复（CR）机制线性可解性未知问题，建立了 CR 机制网络编码包的线性可解性的量化分析模型，给出了在任意阶伽罗华编码有限域下接收方解码出所有源数据包的概率上下界，并提出了一种改进 Gauss-Jordan 的线性可解性在线判定算法。	The linear solvability of network coding based cooperative recovery/repair (CR) scheme was studied. Specifi-cally, the solvability analysis model for network coding based CR scheme was established, the upper and lower bounds of the probability for any receiver to decode all original information under arbitrary order of Galois coding field were pro-posed and proved, and an on-line solvability judgement algorithm was designed by improvement of Gauss-Jordan algo-rithm.
3245	数值实验结果验证了所提上下界的紧密性和改进 Gauss-Jordan算法解码的低等待时延特性，	Numerical results validate the compactness of the proposed upper and lower bounds as well as the short-time de-coding waiting delay of the improved Gauss-Jordan algorithm.
3246	节点部署实验显示改进 Gauss-Jordan 算法较传统 Gauss 算法解码复杂度降低 35%。	Node deployment experiments show that the decodingcomplexity of the improved Gauss Jordan algorithm is reduced by 35% compared with the traditional Gauss algorithm.
3247	在传统通信系统中，随机接入是终端与网络之间建立无线链路的必经过程，只有在随机接入完成之后，终端与网络之间才能正常进行数据传输。	In conventional communication systems, the random access (RA) is a necessary procedure for a user equip-ment (UE) to establish wireless connection to the network before actual data transmission.
3248	聚焦大规模节点物联网，首先阐述了大规模物联网随机接入的基本特征，分析了传统授权随机接入（RA）方法对于大规模物联网应用的局限性；	Focusing on the massive IoTwith large number of nodes, the fundamental characteristics and limitations of conventional grant-based RA were firstlydiscussed.
3249	然后从系统模型、协议框架、算法流程、系统性能等多个角度，讨论免授权 RA、半免授权 RA、无用户标识 RA 三大类新型大规模随机接入方法，分析各类方法优缺点，并指出面临的挑战与潜在的机遇；	Then, the grant-free RA, semi-grant-free RA and unsourced RA for massive IoT were addressed in details frommultiple perspectives, including their system models, protocol frameworks, algorithm procedures, system performance,related pros and cons, as well as critical challenges and potential opportunities.
3250	最后对大规模物联网随机接入涉及的关键技术与共性问题进行了总结。	Finally, some highlights on the related keytechniques and common issues in random access for massive IoT were concluded.
3251	在总结密集连接相关研究的基础上，阐述了未来移动通信网络中密集终端接入的关键技术，分析了网络架构及相关技术、密集连接的传输技术和接入技术等几个重点方向的研究进展，提出了多种连接形式并存的灵活性网络结构。	Based on reviews of the work regarding dense connection, the strategic technologies for dense connection inthe upcoming future mobile communication were illuminated. The state of the art of dense connection, including networkarchitecture and related technologies, the transmission technology of dense connection, and the access technology ofdense connection were analyzed. A flexible access network structure with verity of connection forms coexisting was pro-posed.
3252	针对上下行覆盖不对称问题，结合用户的服务质量需求，提出了基于上下行分离网络架构的密集终端接入方案，阐述了为应对大规模组网和密集连接需求要实现的网络架构立体化和通信与计算一体化的必要性，	Aiming at the asymmetry of uplink and downlink coverage and considering the QoS requirements of users, a denseterminal access scheme based on the uplink-and-downlink-separated network architecture was proposed. The necessity of the three-dimensional network architecture and the integration of communication and computing to meet the needs oflarge-scale networking and dense connection were illuminated.