KR960027544A - Communication control method during mobile communication between macrocell layer and microcell layer - Google Patents

Abstract

The present invention relates to a method for controlling handoff between cell layers operating at different frequencies in a CDMA digital cellular system having a multi-layer cell structure. In particular, a mobile station has a frame error rate exceeding a certain threshold during communication with a base station of a serving cell. The first process of reporting the error rate and average power value of the traffic frame measured by the mobile station itself to the serving cell when it increases or periodically changes, and the switching station receiving the error rate and average power value of the traffic frame of the mobile station through the serving cell; The second process of selecting a handoff execution and a handoff type by using a multi-valued decision model, and in the second process, if the handoff type is a different inter-layer handoff, the exchange has its own network shape. Determining a target cell from the information and handoff channel to the target cell base station And a third step of allocating a channel in response to the request, and the switching center instructs the mobile station to switch to the priority frequency of the target cell by adjusting the time synchronization of the link with respect to the allocated channel and then instructing the mobile station to handoff. And a fifth process of notifying the switching station that the base station for the channel allocated in the fourth process is synchronized with the mobile station and requesting that the switching station recover channel access resources with the base station of the serving cell in communication. And a sixth process of determining that the inter-cell handoff procedure is completed when receiving a response therefrom, the conventional orthogonal frequency provides a communication control method during mobile communication between the macro cell layer and the micro cell layer. Whether the distribution method performs handoff or not Handoff between different cell layers by arbitrary reference speed According to the judgment, in the area such as a large city, especially in a traffic congestion area, the speed of the moving object is very irregular, thereby eliminating the problem of practical unreasonability.

Description

Communication control method during mobile communication between macrocell layer and microcell layer

Since this is an open matter, no full text was included.

1 is an exemplary diagram for explaining a general model of an overlay cell structure composed of a multi-cell layer. 2 is a block diagram of a CDMA cellular system consisting of macrocells and microcells, FIG. 3 is a diagram illustrating a connection between a microcell and a macrocell base station, FIG. Figure 6 is a procedure of handoff detection operation of a mobile station, FIG. 6 is an algorithm for determining handoff between design layers in an exchange station apparatus, FIG. 7 is an illustration of network shape information for each base station, and FIG. 8 is a microcell and a macrocell. FIG. 9 is a procedure for identifying a handoff type in a superimposed cell structure, FIG. 9 is a diagram illustrating a determination of a target cell using a network structure at a mobile station and an exchange station, and a new access procedure with another cell. FIG. 10 is a CDMA including a multi-layer cell. Procedure for controlling handoffs occurring between different cell layers in a cellular system structure.

Claims (2)

In the method of controlling handoff between cell layers, the mobile station may control the error rate and average power of the traffic frame measured by the mobile station itself when the frame error rate increases or exceeds periodically during communication with the base station of the serving cell. A first step of reporting to a base station; A second step in which an exchange receiving an error rate and an average power value of a traffic frame of the mobile station through the serving cell selects whether to perform handoff and a handoff type using a multi-valued killing decision model; In the second step, when the handoff type is handoff from microcell to macrocell, the switching center determines a target cell from its own network shape information, requests a handoff channel to the corresponding target cell base station, and responds to the channel in response. A third process of allocating; A fourth step of the switching station instructing the mobile station to switch to the preferred frequency of the target cell after adjusting the time synchronization of the link with respect to the assigned channel; A fifth step of notifying, by the base station for the channel allocated in step 4, that the acquisition has been synchronized with the mobile station; And the sixth process of requesting to recover channel access resources from the base station of the serving cell in communication and receiving a response therefrom, wherein the switching center determines that the handoff procedure between design layers is completed. Communication control method during mobile communication between cell layers. The method of claim 1, wherein the switching station further comprises the step of changing the location area of the mobile station by notifying the location registration center that the handoff is completed when the location area of the mobile station is changed due to the handoff. A communication control method during mobile communication between a macro cell layer and a micro layer. ※ Note: The disclosure is based on the initial application.