Browse Prior Art Database

Handover into cells outside of Group Call Area in Voice Group Service

IP.com Disclosure Number: IPCOM000033394D
Original Publication Date: 2005-Jan-25
Included in the Prior Art Database: 2005-Jan-25
Document File: 2 page(s) / 41K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

The GSM/3G (Global System for Mobile Communications / Third Generation of mobile wireless network technology) feature Voice Group Call Service (VGCS) allows an entitled subscriber to establish Voice Group Calls within predefined Group Call Areas (GCA). When a VGCS call is established, a common channel is assigned to each cell of the whole predefined Group Call Area. As it is shown in Fig. 1, no radio channel is assigned to the cells outside the Group Call Area. In the one-channel solution of the VGCS, the talker shares the common channel together with the listeners located in the same cell. During the active period of the call, the subscribers may roam inside the predefined Group Call Area. Once a subscriber (talker or listener) is roaming outside the GCA, the radio link will be dropped. The problem is that the talker shares the common channel with the listeners in the one-channel solution. Executing a talker's handover into a cell outside of the GCA is not possible, because there is no common channel established in a cell outside of the GCA. For this reason, the standard handover procedures are not applicable in this case.

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Handover into cells outside of Group Call Area in Voice Group Service

Idea: Dr. Faqiang Qian, AT-Vienna; Hans-Juergen Marx, DE-Munich

The GSM/3G (Global System for Mobile Communications / Third Generation of mobile wireless network technology) feature Voice Group Call Service (VGCS) allows an entitled subscriber to establish Voice Group Calls within predefined Group Call Areas (GCA). When a VGCS call is established, a common channel is assigned to each cell of the whole predefined Group Call Area. As it is shown in Fig. 1, no radio channel is assigned to the cells outside the Group Call Area. In the one- channel solution of the VGCS, the talker shares the common channel together with the listeners located in the same cell.

During the active period of the call, the subscribers may roam inside the predefined Group Call Area. Once a subscriber (talker or listener) is roaming outside the GCA, the radio link will be dropped. The problem is that the talker shares the common channel with the listeners in the one-channel solution. Executing a talker's handover into a cell outside of the GCA is not possible, because there is no common channel established in a cell outside of the GCA. For this reason, the standard handover procedures are not applicable in this case.

The problem can be solved by removing the former restrictions of handover from a GCA to other cells outside of the GCA and implementing a new kind of handover in the VGCS. A dedicated channel to the new cell has to be established to enable a handover from a cell within the GCA to a...