Browse Prior Art Database

JOINT RADIO RESOURCE MANAGEMENT SCHEME FOR INTER UTRA FDD AND UTRA TDD HANDOVER

IP.com Disclosure Number: IPCOM000009651D
Original Publication Date: 2002-Sep-06
Included in the Prior Art Database: 2002-Sep-06
Document File: 7 page(s) / 135K

Publishing Venue

Motorola

Related People

N. Motte: AUTHOR [+3]

Abstract

Purpose of this paper is to present a spectrum efficient Joint Radio Resource Management (JRRM) scheme between heterogeneous Radio Access Technologies (RATs) operating in a same location. Given future reconfigurable terminals capabilities, the vertical handover (VHO) between RATs is a promising approach to optimise resources sharing and enhance current wireless access networks performance. The novel scheme described in this paper considers hybrid metrics combining both individual user and overall system metrics to maximize the VHO success probability in the access and on going communication phases while minimizing the impact on the hosting RAT performance. In this paper, the JRRM scheme is accurately described for two RATs and can also be extended for more than two.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 25% of the total text.

JOINT RADIO RESOURCE MANAGEMENT SCHEME

FOR INTER UTRA FDD AND UTRA TDD HANDOVER

by N. Motte, L. Elicegui, D. Grandblaise

Abstract

Purpose of this paper is to present a spectrum efficient Joint Radio Resource Management (JRRM) scheme between heterogeneous Radio Access Technologies (RATs) operating in a same location. Given future reconfigurable terminals capabilities, the vertical handover (VHO) between RATs is a promising approach to optimise resources sharing and enhance current wireless access networks performance. The novel scheme described in this paper considers hybrid metrics combining both individual user and overall system metrics to maximize the VHO success probability in the access and on going communication phases while minimizing the impact on the hosting RAT performance. In this paper, the JRRM scheme is accurately described for two RATs and can also be extended for more than two.

Problem(s) To Be Solved

In cellular communication systems the radio conditions experienced by the users depends on their location, their speed and the environment where they evolve, for instance the traffic load of their current cellular network. To maintain a certain Quality of Service (QoS) through the network and to permit a high mobility for users, a process called handover was developed. The network triggers this process. It consists in searching a better Base Station (BS) (in term of pathloss, or in term of loading) inside the network to serve the user with a better quality. But, if the network is heavy loaded, it is possible that no handover solutions are available. In this case, the user can loose its communication, another users who want an access in the same geographical zone, will probably be blocked, other users can maintain their links but with a bad quality call, due to the load. In a near future, with the development of reconfigurable terminals, it will be possible to switch users from one RAT to another one. A user experiencing poor radio conditions could be ordered to perform a VHO from one RAT to another one, this aiming at increasing both user and system QoS. This VHO can be seen as a Radio Resource Management (RRM) rule. This paper describes and presents an optimising scheme to manage jointly the radio resources of several RATs: the JRRM Scheme.

Proposed Solution to the Problem(s)

High level Description of the process

The high level description of the JRRM scheme is depicted in Figure 1. The preliminary step of the VHO triggering process consists in detecting troubles like user dissatisfaction (in Blocking B, Dropping D or Bad Quality Call BQC state) or traffic congestion in one of the RAT. This requires collecting information on these parameters. In this paper, two RATs X and Y are considered for the JRRM scheme description. In the following, RAT “i” refers either to RAT “X” or “Y”, i.e. i Î {X, Y} = Z. To appropriately elaborate decision policies, the JRRM scheme needs two sets of information as initial requirements. L...