KR101374796B1 - METHOD THAT TRIGGER ALGORITHM FOR MINIMIZING DELAY OF HARD HAND OFF BY MEANS OF PILOT BEACON IN CDMA2000 1xEV-DO SYSTEM, AND SYSTEM TO THE SAME - Google Patents

Abstract

A method and system for triggering an algorithm for minimizing that delay in hard handoff using pilot beacons in a CDMA2000 1 × EV-DO system are disclosed. The method includes: a) transmitting FA information of a source Rev.A base station to a terminal as a beacon at a target Rev.0 base station; b) When a Route Update Message for handoff from the terminal is received at a Rev.A base station designated as a boundary cell. Confirming, by the system, a PN included in the route update message and a PN of a target base station requested for handoff; c) comparing the PN identified in step b) with the PNs on the neighbor base station list stored in the shape information on the source base station and the PN of the target base station; And d) when the target base station is Rev. 0 as a result of the comparison in step c), the system triggering a hard handoff delay minimization algorithm.

Description

METHOD THAT TRIGGER ALGORITHM FOR MINIMIZING DELAY OF HARD HAND OFF BY MEANS OF PILOT BEACON IN CDMA2000 1xEV-DO SYSTEM, AND SYSTEM TO THE SAME}

The present invention relates to a CDMA2000 1xEV-DO system, and more particularly, to a method for triggering an algorithm for handoff delay when using a pilot beacon during handoff between regions of CDMA2000 1xEV-DO Rev.A and Rev.0; It's about that system.

The mobile communication network is evolving in the order of IS-95A, IS-95B, CDMA2000 1x, CDMA2000 1xEV-DO and CDMA2000 1xEV-DV.

The IS-95A / B network separated the voice and line data from the exchange and provided the service by changing the line data to the packet data by the interworking device (IWF), and the data transmission speed was about 64Kbps to IS-95B .

In addition, in the CDMA2000 1x network, a data core network (DCN) was introduced to support high-speed data services, and a packet data service node (PDSN) was connected to the Internet, and data reception was introduced by the introduction of a home agent (HA). Mobility management has been made possible, and data transfer rates have reached up to 153.6 Kbps.

The CDMA2000 1xEV-DO network is a packet data dedicated network supporting a maximum data transmission rate of 2.4576Mbps. It is implemented together with a CDMA2000 1x system, providing voice service by CDMA2000 1x, sharing a data core network with CDMA2000 1x, - It has a terminal authentication function by the authentication device (AN-AAA) and has a function of managing the terminal position by the data location register (DLR).

Thus, the CDMA2000 1x service is a service that enables wireless Internet at a speed much faster than the speed supported by the IS-95A / B network using the IS-95C network that has evolved from the existing IS-95A / B network.

The CDMA2000 1xEV-DO system began with Qualcomm's announcement of a technology called IS-95 HDR, which is completely different from the CDMA2000 1x method in terms of frequency band, but completely different from the other modulation methods.

In order to provide packet data service, HDR technology adopts CDMA scheme, but adopts the modulated form of signal in completely new format and implements a kind of TDMA function in forward link.

As a result, it has attracted attention because it provides a maximum data rate of 2.4 MHz using the same 1.25 MHz frequency band as IS-95.

Specifically, in the forward link of the CDMA2000 1x system, all channels are multiplexed in the code direction so that the signals of all users are transmitted simultaneously occupying all frequencies.

On the other hand, in the forward link of the CDMA2000 1xEV-DO system, only one user's data is transmitted at a time and another user's signal is transmitted at the next moment. It has a form of multiple access (TDMA).

In this case, since the base station can set the transmission signal power for each user to the maximum value of the base station transmitter, the base station can transmit the signal with the signal most suitable for each user in the time occupied by each user, It can support up to 2.4576Mbps data rate.

Currently, the CDMA2000 1xEV-DO system is evolving from Rev.0, which was commercialized in 2002, to Rev.A, which is currently under commercialization.

Rev.A is an existing 1xEV-DO Rev. 0 By upgrading only the channel card in the system, not only can provide higher peak data rate, but it also includes functions such as QoS that can not be implemented in Rev.0, Infrastructure.

However, since the current 1xEV-DO Rev.0 and Rev.A services are provided in a mixed manner, there is a problem that the quality of the communication service may deteriorate in the border region between Rev.0 and Rev.A.

That is, when the Rev. A terminal moves from the Rev. A region to the Rev. 0 region, the terminal performs handoff (hard handoff) between frequencies.

That is, during hard handoff, since the terminal disconnects the existing link and newly establishes a link through another FA in the mobile area, there is a problem that the communication quality can be significantly reduced compared to the soft handoff. Therefore, from the viewpoint of the operator, it is important to prevent quality deterioration that may occur in the border region between Rev.0 and Rev.A.

In order to improve the above-mentioned deterioration of quality, the following two methods are used. First, a method of storing a data sequence transmitted at the time of handoff and then buffering the data at a certain level, and second, a route update message that the present terminal raises to trigger the first method described above. And the system recognizes the handoff between versions using the pilot beacon and the software handoff respectively.

However, in the above-described methods, unlike soft handoff, link loss may occur at the time of handoff because the existing link is broken and the FA is switched to another FA. In particular, Can not be achieved.

That is, due to the instantaneous loss of the link, flow control operates inside the system, and thus throughput may decrease for a certain period of time even after the link is established. There is also a problem that the throughput is also lowered by calculating and requesting retransmission to the higher node if it is lost.

Therefore, in order to minimize the delay, the system should determine what type of handoff is requested by the terminal and trigger the delay minimization algorithm installed in the system according to the determination result.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hard hand for minimizing degradation of communication quality during hard handoff in the border region of CDMA2000 1xEV-DO Rev.0 and Rev.A. To provide a method and system for triggering an algorithm that minimizes off delay.

It is another object of the present invention to provide a method and system for performing a hard handoff from a 1xEV-DO Rev. A base station to a 1xEV-DO Rev. 0 base station in a border region of CDMA2000 1xEV-DO Rev.0 and Rev.A And the handoff delay suitable for handoff from 1xEV-DO Rev. A base station to 1xEV-DO Rev. 0 base station is minimized by determining the hard handoff method of the UE in order to drive the algorithm for minimizing the hard handoff delay installed in the system. And to provide a system and method for triggering an algorithm to minimize hard handoff delay in a CDMA2000 1xEV-DO system to minimize degradation of call quality.

Method for triggering a hard handoff delay minimization algorithm in a CDMA2000 1xEV-DO system according to the first aspect of the present invention for achieving the above object,

A method of triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system, the method comprising: a) transmitting FA information of a Rev.A base station to a terminal as a beacon at a target Rev.0 base station; And b) receiving a Route Update Message for handoff from the UE at a Rev.A base station designated as a boundary cell. The system includes triggering a hard handoff delay minimization algorithm based on the PN included in the route update message and the PN of the target base station requested for handoff.

Preferably, the step b) is b-1) when receiving a Route Update Message (Route Update Message) for handoff from the terminal at the Rev.A base station designated as the boundary cell. Confirming, by the system, a PN included in the route update message and a PN of a target base station requested for handoff; And b-2) determining whether the target base station is Rev. 0 based on the check result of step b-1), and if the target base station is Rev. 0, the system determines a hard handoff delay minimization algorithm. Triggering.

Also, preferably, the route update message does not include channel information.

Also preferably, the determination of whether the target base station of step b-2 is Rev. 0 uses a neighbor base station list included in the shape information.

Method for triggering a hard handoff delay minimization algorithm in a CDMA2000 1xEV-DO system according to a second aspect of the present invention for achieving the above object,

A method for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system, the method comprising: a) transmitting FA information of a Rev.A base station from a source Rev.A base station to a terminal as a beacon; ; And b) receiving a Route Update Message for handoff from the UE at a Rev.A base station designated as a boundary cell. Confirming, by the system, a PN included in the route update message and a PN of a target base station requested for handoff; c) comparing the PN identified in step b) with the PNs on the neighbor base station list stored in the shape information on the source base station and the PN of the target base station; And d) when the target base station is Rev. 0 as a result of the comparison in step c), the system triggering a hard handoff delay minimization algorithm.

A system for triggering a hard handoff delay minimization algorithm in a CDMA2000 1xEV-DO system according to a third aspect of the present invention for achieving the above object is, in the CDMA2000 1xEV-DO system, a terminal for receiving FA information of a Rev.A base station. Source Rev. A base station for transmitting to the beacon; And a Rev. A base station designated as a boundary cell that receives a route update message for handoff from the terminal, wherein the system includes a PN included in the route update message and a handoff requested target. Based on the PN of the base station, the hard handoff delay minimization algorithm is triggered.

Preferably, when the system receives a Route Update Message (Route Update Message) for the handoff from the terminal at the Rev.A base station designated as the boundary cell. The PN included in the route update message and the PN of the target base station requested to be handed off are checked, and it is determined whether the target base station is Rev. 0 based on the confirmation result. If 0, the hard handoff delay minimization algorithm is triggered.

More preferably, the route update message does not include channel information.

Also preferably, the system uses a neighbor base station list included in the shape information to determine whether the target base station is Rev. 0.

A system for triggering a hard handoff delay minimization algorithm in a CDMA2000 1xEV-DO system according to a fourth aspect of the present invention for achieving the above object,

A CDMA2000 1xEV-DO system, comprising: a target Rev. 0 base station for transmitting FA information of a Rev. A base station to a terminal as a beacon; And a Rev. A base station designated as a boundary cell that receives a route update message for handoff from the terminal, wherein the system includes a PN included in the route update message and a handoff requested target. PN of the base station is checked, and the PN of the neighboring base station list stored in the shape information on the source base station and the PN of the target base station are compared with the checked PN, and when the target base station is Rev. 0, the hard handoff delay It is characterized by triggering a minimization algorithm.

According to the present invention, when a 1xEV-DO Rev.A terminal is hard handoff from a 1xEV-DO Rev.A base station to a 1xEV-DO Rev.0 base station in a border region of CDMA2000 1xEV-DO Rev.0 and Rev.A, By determining the handoff method, appropriately triggering the operation of the hard handoff delay minimization algorithm installed in the system, the call quality is determined by hard handoff from the 1xEV-DO Rev.A base station to the 1xEV-DO Rev.0 base station. The degradation can be minimized.

Hereinafter, the present invention will be described in more detail with reference to examples of the present invention.

A system for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system according to the present invention is performed by a 1xEV-DO Rev.A terminal in a border region of CDMA2000 1xEV-DO Rev.0 and Rev.A. When a hard handoff is performed from a base station to a 1xEV-DO Rev.0 base station, it is determined whether the terminal is in a hard handoff mode to drive a hard handoff delay minimization algorithm installed in the system.

That is, when the system requests a handoff from the terminal, the system compares the PN of the target base station requesting the handoff in the routing update message with the PN on the neighbor list stored in the shape information, so that the handoff is performed at the 1xEV-DO Rev.A base station. 1xEV-DO Rev. 0 Determining whether it is a hard handoff to the base station or not, and triggering the delay minimization algorithm according to the result.

1 is a diagram illustrating an example of a system to which a method for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system according to an embodiment of the present invention is applied.

Referring to FIG. 1, a system to which a method for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system according to an exemplary embodiment of the present invention is applied may be applied to Rev.A and Rev of the 1xEV-DO system. .0 systems can be mixed.

In this system, each of the Rev.A and Rev. 0 base stations (AN (Access Network) 120 and 130) is connected to a terminal (AT (Access Terminal): AT) according to Rev. A and Rev. 0 standards of 1xEV- 110) IP network (not shown).

The PCF (Packet Control Function) 150 includes an SC / MM (Session Control and Mobility Management) function and exchanges control signals and traffic information for a packet data service as a base station controller for providing a packet data service.

AN-AAA (Access Network Authentication, Authorization and Accounting) 140 performs authentication and accounting functions of the terminal 110 for the base stations 120 and 130.

In addition, the PDSN (Packet Data Serving Node) 160 is connected to the base stations 120 and 130 through the PCF 150 to provide a packet data service to the terminal 110.

In the above-described system, as the terminal 110 moves from the source base station 120 of Rev. A to the target base station 130 of Rev. 0, The mobile station 130 performs hard handoff with the FA of the Rev.

This is because the terminal 110 communicates through one FA. In this case, the system according to the present invention designates the border Rev.A base stations between Rev. A and Rev. 0 as border cells.

In addition, the Rev. 0 base station 130 transmits FA information of the Rev. A base station 120 to a pilot beacon for handoff of the terminal 110.

Then, the terminal 110 recognizes the normal handoff, not the inter-FA handoff, and transmits a route update message that does not include channel information.

Then, according to the present invention, the system checks the PN included in the route update message and the PN of the target base station requested for handoff, and checks the identified PN and PNs on the neighbor base station list stored in the configuration information on the source base station. The PNs of the target base stations are compared.

As a result of comparison, when the target base station is Rev. 0, a hard handoff delay minimization algorithm may be triggered, thereby minimizing quality degradation due to delay that may occur in the boundary area between Rev. A and Rev. 0. FIG.

Hereinafter, a method for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 2 is a flow chart for explaining the operation of the apparatus shown in Fig. 1. Fig.

Referring to FIG. 2, first, the target Rev. 0 base station 130 transmits FA information of the source Rev. A base station 120 to the terminal as a beacon (S1).

As the Rev.A terminal 110 approaches the target Rev.0 base station 130 from the source Rev.A base station 120, the terminal 110 determines a handoff and a Route Update Message. ) Is transmitted to the source Rev. A base station 120 (S2).

In the case of receiving a route update message for handoff from the terminal 110 at the Rev.A base station 120 designated as a boundary cell.

The system checks the PN included in the route update message and the PN of the target base station requested for handoff (S3).

Subsequently, the PN identified in step S3) is compared with the PNs of the neighbor base station list stored in the shape information on the source base station 120 and the PN of the target base station 130 (S4).

When it is determined that the target base station is a Rev. 0 base station, the system determines that the handoff of the terminal 110 is performed from the source Rev. A base station 120 to the target Rev. 0 base station 130. Check the hard handoff, and trigger to start the delay minimization algorithm already installed in the system (S5, S6).

Accordingly, when a 1xEV-DO terminal is handed off from a 1xEV-DO Rev.A base station to a 1xEV-DO Rev.0 base station in the border region of CDMA2000 1xEV-DO Rev. 0 and Rev. A, the handoff method is determined. By properly triggering the hard handoff delay minimization algorithm installed in the system, it is possible to minimize the degradation of call quality by hard handoff from the 1xEV-DO Rev.A base station to the 1xEV-DO Rev.0 base station. do.

As described above, according to the present invention, an algorithm that minimizes the hard handoff delay for minimizing deterioration of communication quality during hard handoff in the border region of CDMA2000 1xEV-DO Rev. 0 and Rev.A is triggered ) And the system can be realized.

Although the present invention has been described in detail by way of the above embodiments, the present invention is not limited thereto, but can be modified or improved within the ordinary knowledge of those skilled in the art.

In addition, in the border region of CDMA2000 1xEV-DO Rev.0 and Rev.A, when a 1xEV-DO Rev.A terminal is hard handoff from a 1xEV-DO Rev.A base station to a 1xEV-DO Rev.0 base station, a handoff method is used. In order to appropriately trigger the driving of the hard handoff delay minimization algorithm installed in the system, it is an invention that is industrially applicable because not only is there a sufficient possibility of commercialization or sales, but also a degree that can be clearly realized in reality. .

1 is a diagram illustrating an example of a system to which a method for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system according to an embodiment of the present invention is applied.

Fig. 2 is a flow chart for explaining the operation of the apparatus shown in Fig. 1. Fig.

Description of the Related Art

110: AT 120: Source AN Rev.A

130: Target AN Rev. 0 140: AN AAA

150: PCF 160: PDSN

Claims (10)

A method for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system, a) transmitting, by the target Rev. 0 base station, the FA information of the source Rev. A base station to the terminal as a beacon; And b) when receiving a route update message for handoff from the terminal at a Rev.A base station designated as a boundary cell, the system includes a PN included in the route update message and a target base station requested for handoff; Triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system, based on the PN of the method. The method of claim 1, wherein step b) b-1) When a Route Update Message for handoff from the terminal is received at a Rev.A base station designated as a boundary cell. Confirming, by the system, a PN included in the route update message and a PN of a target base station requested for handoff; And b-2) On the basis of the check result of step b-1), it is determined whether the target base station is Rev. 0, and if the target base station is Rev. 0, the system determines a hard handoff delay minimization algorithm. And triggering a hard handoff delay minimization algorithm using a pilot beacon in the CDMA2000 1xEV-DO system. 3. The method of claim 1 or 2, wherein the route update message does not include channel information. The method of claim 1 or 2, wherein the hard handoff delay minimization algorithm using a pilot beacon in the CDMA2000 1xEV-DO system is performed. The pilot of the CDMA2000 1xEV-DO system according to claim 1 or 2, wherein the determination of whether the target base station of step b-2 is Rev. 0 is performed by using a neighbor base station list included in the shape information. How to trigger a hard handoff delay minimization algorithm using beacons. A method for triggering a hard handoff delay minimization algorithm using a pilot beacon in a CDMA2000 1xEV-DO system, a) transmitting, by the target Rev. 0 base station, the FA information of the source Rev. A base station to the terminal as a beacon; b) When a Route Update Message for handoff from the terminal is received at a Rev.A base station designated as a boundary cell. Identifying, by the system, a PN included in the route update message and a PN of a target base station requested for handoff; c) comparing the PN identified in step b) with the PNs on the neighbor base station list stored in the shape information on the source base station and the PN of the target base station; And d) when the target base station is Rev. 0 as a result of the comparison of step c), the system includes a step of triggering a hard handoff delay minimization algorithm, wherein the hard with a pilot beacon in the CDMA2000 1xEV-DO system How to trigger a handoff delay minimization algorithm. In a CDMA2000 1xEV-DO system, A source for transmitting FA information of a Rev. A base station as a beacon to a terminal Rev. A base station; And a Rev. A base station designated as a boundary cell that receives a route update message for handoff from the terminal, wherein the system includes a PN included in the route update message and a handoff requested target. CDMA2000 1xEV-DO system for triggering a hard handoff delay minimization algorithm using a pilot beacon, characterized in that to trigger a hard handoff delay minimization algorithm based on the PN of the base station. The method of claim 6, wherein the system receives a Route Update Message for handoff from the terminal at a Rev.A base station designated as a boundary cell. The PN included in the route update message and the PN of the target base station requested to be handoff are checked, and it is determined whether the target base station is Rev. 0 based on the confirmation result. .0, CDMA2000 1xEV-DO system to trigger a hard handoff delay minimization algorithm using a pilot beacon, characterized in that to trigger the hard handoff delay minimization algorithm. 8. The CDMA2000 1xEV-DO system according to claim 6 or 7, wherein the route update message does not include channel information. The hard handoff delay using a pilot beacon according to claim 6 or 7, wherein the system uses a neighbor base station list included in shape information to determine whether the target base station is Rev. 0. CDMA2000 1xEV-DO system that triggers a minimization algorithm. In a CDMA2000 1xEV-DO system, A target Rev. 0 base station for transmitting the FA information of the Rev. A base station to the terminal as a beacon; And a Rev. A base station designated as a boundary cell that receives a route update message for handoff from the terminal, wherein the system includes a PN included in the route update message and a handoff requested target. PN of the base station is checked, and the PN of the neighboring base station list stored in the shape information on the source base station and the PN of the target base station are compared with the checked PN. CDMA2000 1xEV-DO system triggering a hard handoff delay minimization algorithm, characterized in that it triggers a minimization algorithm.

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