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Access Load Balancing for the Seamless Mobility

IP.com Disclosure Number: IPCOM000126917D
Original Publication Date: 2005-Aug-10
Included in the Prior Art Database: 2005-Aug-10
Document File: 2 page(s) / 81K

Publishing Venue

Motorola

Related People

Zhijun Cai: AUTHOR [+2]

Abstract

The User Equipment (UE) can have multiple radio access capabilities, such as 802.16, W-CDMA (Wide-Band CDMA), etc. All IP (Internet Protocol) network makes IMS (Internet Protocol Multimedia Sub-system) a good platform over multiple radio access techniques. However, the traffic load can be different for different access techniques in different locations. How to efficiently balance the load over multiple access techniques is not resolved yet. In this paper we propose a centralized solution for the load balance control based on the periodical load update and the determined access probability factor.

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Access Load Balancing for the Seamless Mobility

By Zhijun Cai, Bonnie Chen

Motorola, Inc.

 

ABSTRACT

The User Equipment (UE) can have multiple radio access capabilities, such as 802.16, W-CDMA (Wide-Band CDMA), etc. All IP (Internet Protocol) network makes IMS (Internet Protocol Multimedia Sub-system) a good platform over multiple radio access techniques. However, the traffic load can be different for different access techniques in different locations. How to efficiently balance the load over multiple access techniques is not resolved yet. In this paper we propose a centralized solution for the load balance control based on the periodical load update and the determined access probability factor.

PROBLEM

When multiple radio techniques are available in an area, a method should be designed for the load balance. This issue becomes more and more important with the fast development of the seamless mobility. A contribution [1] to 3GPP SA2 May 2005 meeting mandates radio access network load balancing.  Below is the partial extract:

 “2) real-time control requirements

     The operator shall be able to take real-time    control as follows: Move some or all of the users from one access system to another; Remove some or all the users from a specific access system; Force some or all the users to reselect the access systems.”

Hence, an efficient and simple method for the load balance control is important for the heterogonous networks.  

SOLUTION

In this paper, we propose a centralized method for the load balance control. A new core network entity called General Radio Resource Management (GRRM) is designed. The GRRM is transparent to the radio access networks. All the radio access nodes in each radio access networks (like radio access controllers in the Universal Mobile Telecommunications Systems (UMTS) and the access points in the 802.16 networks) should report its load situation to the GRRM periodically or event-triggered. The GRRM then decides the radio access probability factor per radio access nodes based on certain criteria. The parameters then are transmitted to the different radio access networks. The radio access nodes can decide the load control based on the received parameters.      

OPERATION

On the network side,

1) The radio access nodes for different access techniques periodically report (or event triggered report) their load conditions to the GRRM. The GRRM is a logical functional entity and may reside outside of the radio access networks, for example, inside the IMS core network. See Fig 1.

Fig. 1 periodical update of load information

2) The GRRM stores radio load conditions.  The Network Operator’s network administration system has access the radio load co...