Research On Access Scheme Of Mtc Group Paging And Location Management

Both H2H and M2M communications are involving in a variety of wireless access technologies and personal mobility services.This paper is getting down to researching about the location managemet signaling overhead and group paging access performance.An improved movement-based location update (IMBLU) scheme was proposed in the literature to tackle the vulnerability of the original movement-based location update (OMBLU) scheme, which performs a location update (LU) when the number of cells crossedreaches a movement threshold, to the ping-pong effect, a synonym for the phenomenon that a user equipment (UE) moves back-and-forth between adjacent cells. In the IMBLU scheme the criterion for performing an LU is that the number of derent cells visited reaches the movement threshold. Prior to implementing the IMBLU scheme in wireless communication networks, first we need to determine the optimal movement threshold that minimizes the signaling cost of the IMBLU scheme incurred by LUs and paging. Therefore, a comprehensive mathematical model is required. This paper devotes to this requirement by developing such a model to analyze the signaling cost of the IMBLU scheme. We characterize UE mobility by a one-dimensional random walk model and derive closed-form analytical formula for the signaling cost of the IMBLU scheme, based on which we carry out a numerical to investigate the infuence of relevant parameters on the signaling cost. It is observed that the signaling cost is a downward convex function with respect to the movement threshold, that the superiority of the IMBLU scheme over the OMBLU scheme is proportional to the intensity of the ping-pong effect, as well as that the variance of cell residence time exerts noticeable influence on the signaling cost only in the scenario of low mobility. This paper can guide the implementation of the IMBLU scheme in wireless communication networks.RAN2proposed a group paging scheme to efficiently solve the radio access network overload problem when a large number of machine-type communication devices (MTC) access the LTE network simultaneously. However, the access performance decreases obviously as the number of devices increases in the paging group when the group paging process uses the traditional random access scheme in LTE network. A pre-backoff random access scheme was proposed to solve the overload problem effectively when large MTC devices use the traditional random access scheme. In the pre-backoff random access scheme, random access process uses the pre-backoff scheme which can uniformly distribute the access attempts within the pre-backoff window. In this paper we present an analytical model to assess the access performance of the group paging based on the pre-backoff random access scheme. We derive analytical formulas for the access performance based on the model. Through the numerical calculation, we get the performance metrics including access success probability, average number of preamble transmissions and average access delay of the group paging based on pre-backoff scheme with various combinations of group size and pre-backoff value. Numerical results indicate that the pre-backoff random access scheme can obviously enhance the access performance of the group paging.