KR20030057980A - Method for Handover between Generations in Wireless Communication System - Google Patents

Abstract

PURPOSE: An inter-generation handover method in a wireless communication system is provided to suitably perform a handover according to a radio environment by mixedly applying a software and hardware-wise enhanced handover method at a boundary between 2-generation and 2.5-generation. CONSTITUTION: When a 2-generation terminal is positioned in a coverage area of a 2.5-generation base station, the 2-generation terminal is maintained in a state of being tuned to the 2.5-generation base station(S201). The 2-generation terminal discriminates whether a signal of the 2.5-generation base station and signal of an adjacent 2-generation base station have the same amount(S203). If the two signals have the same amount, the 2-generation terminal performs a hardware Beacon handover(S205). If the amounts of two signals are different, the 2-generation terminal performs a software enhanced handover(S207).

Description

Method for Handover between Generations in Wireless Communication System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intergenerational handover method in a wireless communication system, and more particularly, in a base station that differs in generation of a wireless communication system such as a code division multiple access (CDMA) mobile telephone system. It relates to an inter-generation handover method in a wireless communication system for handover.

1 is a block diagram of a general CDMA system.

The mobile station (MS) 110 wirelessly communicates with the base station 120 to transmit and receive call connection and traffic messages, and connects the user to the base station 120 to perform signal processing for voice conversion and incoming / outgoing calls. do.

The base station (BTS) 120 wirelessly communicates with the mobile station 110 to perform a call control function such as call connection and transmission and reception of traffic data, and is connected to the control station 130 by wire to the mobile station 110. The call connection or traffic message is transmitted to the control station 130 or the control station 130 transmits a message to the mobile station 110 to the mobile station 110. In addition, the signal processing for communication with the control station 130, and the communication with the operating station to perform the maintenance processing function.

The control station 130 is connected to a plurality of base stations 120 to perform call processing functions such as call / receive and handoff between the base station 120 and the switching station 140, and maintain the base station 120. Function to repair.

The exchange station 140 connects with the control station 130, the public switched telephone network (PSTN), and other exchange stations 140 to perform mobile phone call / receive call processing, handoff processing, system maintenance, and operation management functions. .

In general, a mobile communication system arranges a plurality of base stations 120 in a service area due to problems such as frequency use efficiency and power consumption, and provides a service by dividing into sectors within the same base station 120. In this case, when the mobile station 110 moves during a call, it provides a handover function that constantly connects to a wireless channel of another base station 120 or another sector to maintain continuity of the call.

With the development of communication technology, mobile communication service providers have added 2.5 generation functions to existing 2 generation systems to provide 2.5 generation system services to subscribers using the 2.5 generation services to subscribers method.

However, there is a problem in that the call traffic rate is lowered to 50% or less when using the hardware beacon handover method applied to the second generation in the boundary between the second generation and the 2.5 generation generation.

As a countermeasure, there has been a movement to solve this by software using the 2.5G standard algorithm, Enhanced Handover, but the call rate is less than 50% in the 2nd and 2.5th generation boundary areas. Has caused a problem

The present invention has been proposed to solve all the problems of the prior art as described above, by applying a combination of software and hardware enhanced handover method in the 2nd generation and 2.5th generation boundary area, handover appropriately according to the propagation environment It is an object of the present invention to provide an inter-generation handover method in a wireless communication system that can be performed.

1 is a configuration diagram of a general CDMA system;

2 is a flowchart illustrating an intergenerational handover method according to the present invention;

* Explanation of symbols for the main parts of the drawings

110: mobile station 120: base station

130: control station 140: exchange station

The present invention for achieving the above object, in the intergenerational handover method between the second generation and 2.5 generations in a wireless communication system, the hardware beacon method handover applied in the second generation, software enhanced handover applied in 2.5 generations It is characterized in that for using the handover at the same time.

In addition, the present invention provides a generational handover method between generation 2 and generation 2.5 in a wireless communication system, comprising: a first step of tuning to a signal of a generation 2.5 base station; Comparing a signal received from the 2.5G base station with a signal received from the 2G base station; A third step of performing a hardware beacon handover if the comparison result of the second step is the same; And a fourth step of performing software enhanced handover when the comparison result of the second step is not the same.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In general, when a subscriber attempts to make a call while moving from region A to region B, the number of channels in the region A determines the channel to which the subscriber will make a call. The same number of channels must exist to enable handover.

In the case of handover from the second generation region to the second generation region, the handover success rate was more than 95% when the handover was performed by the hardware beacon method.

However, with the advent of 2.5G base stations, the success rate dropped to 50% or less when the same hardware beacon handover was applied between 2.5G and 2G regions.

Thus, the software performed Enhanced Handover, a standard algorithm of 2.5 generations of CDMA2000-1x, that is, 2.5, but also showed a call rate of less than 50%. This is a problem caused by handover based on the latest received base station signal, which can be solved when handover is performed based on the clearest signal.

Therefore, in performing the handover in the 2nd and 2.5th generation boundaries, the hardware beacon method applied in the 2nd generation and the software enhanced handover applied in the 2.5th generation are applied, in which case the call rate is up to 90%. It can be seen that it can increase.

2 is a flowchart illustrating an inter-generation handover method according to the present invention.

As shown in the figure, when the second generation terminal exists in the coverage area of the 2.5 generation base station, the second generation terminal is maintained in a state tuned to the 2.5 generation signal (S201).

The second generation terminal determines whether the signals of the 2.5th generation base station and the amount of the signal of the surrounding second generation base station is the same (S203), and if the same, performs a hardware beacon handover (S205), if not the same In step S207, software enhanced handover is performed.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The present invention as described above, by selectively applying the beacon method and the reinforcement handover method according to the propagation environment for each section, when the generation terminal performs the call attempt after tuning to the 2.5 generation channel to improve the call disconnection rate It has the effect of making it possible.

In addition, the present invention has the effect of effectively eliminating the system and haptic quality deterioration factors due to coverage.

Claims (2)

In the intergenerational handover method between 2nd generation and 2.5th generation in a wireless communication system, Handover using both hardware beacon handover applied in 2nd generation and software enhanced handover applied in 2.5th generation Generational handover method characterized in that. In the intergenerational handover method between 2nd generation and 2.5th generation in a wireless communication system, A first step of tuning to a signal of a 2.5G base station; Comparing a signal received from the 2.5G base station with a signal received from the 2G base station; A third step of performing a hardware beacon handover if the comparison result of the second step is the same; And A fourth step of performing a software enhanced handover if the result of the comparison of the second step is not the same; Intergenerational handover method comprising a.