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Load sharing in multi-access systems

A multi-access and access network technology, applied in access restriction, network traffic/resource management, electrical components, etc., to achieve high-capacity effects

Inactive Publication Date: 2010-12-08
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The problem with this approach is that the system relatively frequently reaches a situation where all access attempts have to go through a directed retry mechanism

Method used

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  • Load sharing in multi-access systems

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] In this specification, the following abbreviations are used generally:

[0032] GSM Global System for Digital Mobile Telephony

[0033] WLAN wireless local area network

[0034] WCDMA Wideband Code Division Multiple Access

[0035] UMTS Universal Mobile Telephone System

[0036] CSE Circuit Switching Equipment

[0037] Number of U users

[0038] C capacity

[0039] SNR signal to noise ratio

[0040] Q quality

[0041] First some observations:

[0042] The quality of service provided generally degrades with the number of users served. This holds for both wide area and local area systems. The communication load at which the quality is equal to the quality requirement is expressed as "capacity".

[0043] Overall capacity is maximized when quality requirements are met in both wide-area and local-area systems. If this is not the case, there is "spare capacity" available in at least one system. When the communication load is lower than the overall capacity limit, ...

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Abstract

In a multi-access system, an access selection principle is achieved by selecting a signal strength threshold level (130-133) based on a determined load level (ULOCAL) in a first access network. A new user in an area commonly covered by more than one access networks attempts to allocate to the first access network if an experienced signal strength exceeds the signal strength threshold level (130-133). Communication utility can preferably be maximized or at least be taken into account by using suitable load level relativity. By increasing the threshold when the load level approaches the capacity limit, a first completely loaded access network is avoided. An opportunity which lets particularly well-suited users still can access to the first access network is gave. At the same time, since thepreferred access is judged before the actual access attempts, control signalling can be significantly reduced even at very high traffic loads.

Description

technical field [0001] The present invention relates generally to multiple access wireless communication systems and in particular to load sharing apparatus and methods in such systems. Background technique [0002] It is likely that future wireless networks will include a large part of multiple access networks. A typical example is a network consisting of a wide area coverage system providing medium bit rate services to mobile users and supplemented by a local area coverage system providing high bit rate services to users in hotspots. In such systems, both user behavior and system characteristics require better user quality in hotspots, such as higher bit rates. [0003] Combined systems with heterogeneous site-dependent quality requirements thus arise. The overall capacity C can then be defined as satisfying the wide-area (Q wide-min ) and local (Q local_min ) the maximum number of users U required by quality: [0004] C=max{U:Q wide (U wide )>=Q wide_min &Q lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/18H04W48/06
CPCH04W48/18H04W48/06H04W28/0236
Inventor M·普里此A·富鲁卡J·彼得森A·西蒙森H·卡林
Owner TELEFON AB LM ERICSSON (PUBL)