Calling permission control method and device in CDMA mobile communication system

A technology of call admission control and mobile communication system, which is applied in the direction of selection device, wireless communication, multi-frequency code system, etc., and can solve the problems that there is no call admission control method and communication quality cannot be guaranteed.

Inactive Publication Date: 2004-03-31
NTT MOBILE COMM NETWORK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this paper only draws the relationship between the blocking probability and the amount of traffic provided, and the call admission control method in this paper cannot guarantee the communication quality
[0013] For CDMA mobile communication, there is no generally known call admission control method that can satisfy a given blocking probability while ensuring a predetermined communication quality failure probability

Method used

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  • Calling permission control method and device in CDMA mobile communication system
  • Calling permission control method and device in CDMA mobile communication system
  • Calling permission control method and device in CDMA mobile communication system

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Embodiment Construction

[0042] now refer to Figure 1 to Figure 6 The first embodiment of the method and apparatus for call admission control in the CDMA mobile communication system based on the present invention will be described in detail.

[0043] In the first embodiment, the CDMA mobile communication system has such figure 1 The mode configuration shown includes a plurality of base stations 11 and a plurality of mobile stations 13 communicating via the base stations 11 by using one or more spreading codes to tune to the CDMA mode of the communication signal. Assume that each base station 11 uses a frequency bandwidth shared by a plurality of users for each uplink (transmission from the mobile station 13 to the base station 11) and downlink (transmission from the base station 11 to the mobile station 13), and all base stations 11 use the same frequency bandwidth.

[0044] Each base station 11 in the first embodiment has a partial functional configuration related to call admission control shown i...

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Abstract

A call admission control scheme for a CDMA mobile communication system which can satisfy a given connection quality (blocking probability) while guaranteeing a predetermined communication quality. At each base station, a blocking probability and an outage probability of communication quality at each base station are calculated to adjust a maximum number of simultaneously connectable users at each base station according to the calculated results, and a call admission control is carried out according to the adjusted maximum number of simultaneously connectable users. A maximum number of simultaneously connectable users or an interference threshold can be determined from a first relationship between an offered traffic and a maximum number of simultaneously connectable users or an interference threshold for guaranteeing the prescribed communication quality and a second relationship between an offered traffic and a maximum number of simultaneously connectable users or an interference threshold for satisfying the prescribed blocking probability, and used for the call admission control.

Description

technical field [0001] The present invention relates to a method and an apparatus for call admission control during mobile communications between a plurality of base stations and mobile stations which communicate using the CDMA (Code Division Multiple Access) mode. Background technique [0002] A well-known example of a currently existing portable telephone or mobile telephone system is a cellular system which provides service by distributing a number of base stations in its service area, each base station having a service radio area radius of about several kilometers. [0003] Generally, in a mobile communication system using a limited radio frequency bandwidth, there is a trade-off between communication quality and system capacity (the maximum amount of traffic provided that satisfies a predetermined blocking probability condition). [0004] In a conventional system that fixedly assigns channels to individual base stations using FDMA (Frequency Division Multiple) mode or T...

Claims

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Application Information

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IPC IPC(8): H04W28/08H04W28/10H04W72/08H04W74/08
CPCH04W72/00
Inventor 石川义裕梅田成视
Owner NTT MOBILE COMM NETWORK INC
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