Mobility metrics of wireless networks such as link availability, number of neighboring nodes, link duration, link state, and link stability make it difficult to provide a node with quality of services guarantee. In previous research on Quality of Service (QoS) for cellular networks especially for handling handoff connections, the design was based on a flat 2D hexagon cells. However, in reality Base Station antenna coverage is in a 3D space and there exists a blind spot; the area which is just above and bellow the radiated antenna. In this paper we introduce the concept of Blind Spot (BS) in which there is no signals to initiate a call or accepting a handoff one. In BS, the signal power equal zero. Even if there is enough bandwidth to initiate or accept a handoff call, it will be blocked or dropped respectively. We present an implementation of Static Borrowing Scheme (SBS) and we extend the dynamic-rate based borrowing scheme  into 3-Dimentional structure and call it 3-Dimensional Dynamic Based Borrowing Scheme (3D DBBS). The proposed new technique for resource sharing is to ensure the continuity for both originating and handoff connections in 3-D cellular networks based on Dynamic-Based Borrowing Scheme (3D BBS). This technique aims to minimize the blocking probability of the originating calls by minimizing the dropping probability of the handoff requests and maximizing the channel utilization. The results revealed that 3D DBBS outperformed the static based schemes by 5% on average even when the blind spot of the base station antenna is taken into consideration. When moving to a 3D space, the results of the simulation showed the 3D DBBS outperformed the static scheme by 2% on average. As a result, considering nodes in a 3D space will have better QoS guarantee as the blocking and dropping probabilities are decreased. Thus, the bandwidth utilization is increased.
 S. H. Al-Sharaeh, “Dynamic Rate-Based Borrowing Scheme for QoS Provisioning in High Speed Multimedia Wireless Cellular Networks,” Applied Mathematics and Computation, Vol. 179, No. 2, 2006, pp. 714-724.
 C.-J. Huang, Y.-T. Chuang and D.-X. Yang, “Implementation of Call Admission Control Scheme in Next Generation Mobile Communication Networks Using Particle Swarm Optimization and Fuzzy Logic Systems,” Expert Systems with Applications, Vol. 35, No. 3, 2008, pp. 1246-1251.
 H.-Y. Hsieh, C.-W. Li, S.-W. Liao, Y.-W. Chen, T.-L. Tsai and H.-P. Lin, “Moving toward End-to-End Support for Handoffs across Heterogeneous Telephony Systems on Dual-Mode Mobile Devices,” Computer Communications, Vol. 31, No. 11, 2008, pp. 2726-2738.
 P. V. Krishna, N. C. S. N. Iyengar and S. Misra, “An Efficient Hash Table-Based Node Identification Method for Bandwidth Reservation in Hybrid Cellular and Ad-Hoc Networks,” Computer Communications, Vol. 31, No. 4, 2008, pp. 722-733. doi:10.1016/j.comcom.2007.10.018
 N. Hu and W.-L. Wu, “Call Admission Control Scheme for Real-Time Services in Packet-Switched OFDM Wireless Networks,” The Journal of China Universities of Posts and Telecommunications, Vol. 15, No. 1, 2008, pp. 80-84.
 S. A. AlQahtani and A. S. Mahmoud, “Performance Analysis of Two Throughput-Based Call Admission Control Schemes for 3G WCDMA Wireless Networks Supporting Multiservices,” Computer Communications, Vol. 31, No. 1, 2008, pp. 49-57.
 D. A. Levine, I. F. Akyildiz and M. Naghshineh, “The Shadow Cluster Concept for Resource Allocation and Call Admission in ATM-Based Wireless Networks,” Proceedings of the 1st Annual International Conference on Mobile Computing and Networking, 1995, pp. 142-150.
 X. Y. Luo, I. L.-J. Thng, B. Li and S. M. Jiang, “Measurement-Based Pre-assignment Scheme with Connection-Level QoS Support for Multiservice Mobile Networks,” Lecture Notes in Computer Science, Vol. 1815, 2000, pp. 932-944.
 J. Carle, J.-F. Myoupo and D. Sem, “A Basis for 3-D Cellular Networks,” Proceedings of the 15 International Conference on Information Networking (ICOIN.01), Beppu City, 31 January-2 February 2001, pp. 631-636.
 E. Mona, O. Stephan and A. Hussein, “A Rate-Based Borrowing Scheme for QoS Provisioning in Multimedia Wireless Networks,” IEEE Transactions on Parallel and Distributed Systems, Vol. 13, No. 2, 2002, pp. 156-166.