KR101453986B1 - METHOD FOR MINIMIZING DELAY OF HARD HAND OFF THAT USES CHANNEL RECORD IN CDMA2000 1xEV-DO SYSTEM, AND SYSTEM TO THE SAME - Google Patents

METHOD FOR MINIMIZING DELAY OF HARD HAND OFF THAT USES CHANNEL RECORD IN CDMA2000 1xEV-DO SYSTEM, AND SYSTEM TO THE SAME Download PDF

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KR101453986B1
KR101453986B1 KR1020080038389A KR20080038389A KR101453986B1 KR 101453986 B1 KR101453986 B1 KR 101453986B1 KR 1020080038389 A KR1020080038389 A KR 1020080038389A KR 20080038389 A KR20080038389 A KR 20080038389A KR 101453986 B1 KR101453986 B1 KR 101453986B1
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handoff
system
base station
channel
update message
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KR1020080038389A
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KR20090112475A (en
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김연종
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에스케이텔레콤 주식회사
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Abstract

A method and system for triggering an algorithm to minimize its delay in hard handoff using channel records in a CDMA2000 IxEV-DO system is disclosed. The method includes: a) determining a handoff at a terminal; b) transmitting a route update message from the terminal to the source Rev. A base station according to the decision of step a); c) receiving a route update message from the terminal. Comparing the PN and channel records of the target base station included in the route update message with the current channel in the system; d) determining that the handoff is a handoff from Rev.A to Rev. 0 if it is determined to be a channel different from the current channel as a result of the comparison in step c); And e) if it is determined in step d) that the handoff is a different version, the system includes triggering a hard handoff delay minimization algorithm.

Description

[0001] The present invention relates to a method and a system for triggering a delay minimization algorithm of a hard handoff using a channel record in a CDMA2000 IxEV-DO system. }

The present invention relates to a CDMA2000 IxEV-DO system, and more particularly to a CDMA2000 IxEV-DO system in which a channel record in a route update message during handoff between regions of CDMA2000 1xEV-DO Rev.A and Rev. A method for triggering an algorithm for minimizing a handoff delay in a hard handoff between versions, and a system thereof.

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) is introduced to support high-speed data service, a packet data service node (PDSN) can access the Internet, Mobility management has become possible and the data transmission speed reaches up to 153.6Kbps.

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, the forward link of the CDMA2000 1x system is transmitted with all channels multiplexed in the code direction so that all user signals occupy all frequencies simultaneously, while the forward link of the CDMA2000 1xEV-DO system transmits only one user at a time That is, time division multiple access (TDMA), having different signal transmission times for each user by transmitting another user's signal at the next moment. 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 to the Rev. 0 region in the Rev. A region, the terminal performs an inter-frequency handoff (hard handoff). That is, in the case of a hard handoff, the terminal has to disconnect the existing link and newly set up a link through another FA in the moving area, so that there is a problem that the communication quality may be significantly lowered compared with 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 deterioration of the quality described above, 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, as the link is instantaneously lost, the flow control is operated in the system, so that the throughput may be lowered for a certain period of time even after the link is established, and the sequence between the transmitted data and the data to be transmitted And when it is lost, it is requested to retransmit it to an upper node, which also causes a problem that the throughput of the work is lowered.

Therefore, in order to minimize the delay when the hard handoff occurs, the system determines what type of handoff scheme is requested by the terminal and triggers the delay minimization algorithm installed in the system according to the determination result.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a hard hand for minimizing deterioration of communication quality during hard handoff in a border region of CDMA2000 1xEV- And 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.

According to a first aspect of the present invention, there is provided a method of triggering a hard handoff delay minimization algorithm using a channel record in a CDMA2000 IxEV-DO system, the method comprising: a) step; And b) when a route update message is generated from the terminal. The system includes triggering a hard handoff delay minimization algorithm based on a channel record included in the route update message and a channel of a target base station requested to be handed off.

Preferably, the step (b) includes the steps of (b-1) receiving a route update message for handoff from the terminal. Comparing a channel record of a target base station requested to be handed off included in the route update message with a current channel; And b-2) determining, based on the comparison result of step b-1), that handoff between the Rev. A base station and the Rev. 0 base station is different when the current channel and the target base station are different from each other, Accordingly, the system includes triggering a hard handoff delay minimization algorithm.

Preferably, the terminal periodically updates the route update message.

More preferably, the updating of the route update message of the terminal is performed according to the channel information indicated on the neighbor list (Neighbor List).

According to a second aspect of the present invention, there is provided a method for triggering a hard handoff delay minimization algorithm using a channel record in a CDMA2000 IxEV-DO system, the method comprising: a) step; b) transmitting a route update message from the terminal to the source Rev. A base station according to the decision of step a); c) receiving a route update message from the terminal. Comparing the PN and channel records of the target base station included in the route update message with the current channel in the system; d) determining that the handoff is a handoff from Rev.A to Rev. 0 if it is determined to be a channel different from the current channel as a result of the comparison in step c); And e) if it is determined in step d) that the handoff is a different version, the system includes triggering a hard handoff delay minimization algorithm.

A CDMA2000 1xEV-DO system for triggering a hard handoff delay minimization algorithm using channel records according to a third aspect of the present invention for achieving the above object is a system for determining a handoff in a CDMA2000 1xEV- When a route update message is generated from the terminal. The system triggers a hard handoff delay minimization algorithm based on the channel record included in the route update message and channel information of a target base station requested to be handed off.

Preferably, the system receives a route update message for handoff from the terminal. And comparing the channel record of the target base station requested to be handed off included in the route update message with the current channel and if the channel of the current base station is different from the channel of the target base station based on the comparison result, It is determined that the handoff between the Rev. A base station and the Rev. 0 base station is handled, and the hard handoff delay minimization algorithm is triggered according to the determination result.

Preferably, the terminal periodically updates the route update message.

More preferably, the updating of the route update message of the terminal is performed according to the channel information indicated on the neighbor list (Neighbor List).

In a CDMA2000 1xEV-DO system for triggering a hard handoff delay minimization algorithm using a channel record according to a fourth aspect of the present invention for achieving the above object, a CDMA2000 IxEV- When a route update message is generated from the terminal. The system compares the PN and the channel record of the target base station included in the route update message with the current channel and if the handoff is determined to be a different result from the current channel, . ≪ / RTI > In this case, it is determined that the handoff between the .0 base stations is triggered.

According to the present invention, when the 1xEV-DO Rev. A terminal performs hard handoff from the 1xEV-DO Rev. A base station to the 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 comparing the current channel with the channel record of the target base station included in the route update message and the operation of the hard handoff delay minimization algorithm installed in the system is appropriately triggered according to the determination result, The degradation of the communication quality can be minimized by the hard handoff from the Rev. A base station to the 1xEV-DO Rev. 0 base station.

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

The CDMA2000 1xEV-DO system that triggers the hard handoff delay minimization algorithm using the channel record according to the present invention is characterized in that the 1xEV-DO Rev.A terminal in the border region of CDMA2000 1xEV-DO Rev.0 and Rev.A is 1xEV- Rev.A When a hard handoff from a base station to a 1xEV-DO Rev.0 base station is performed, the handoff method of the terminal determines how to perform a handoff in order to drive the hard handoff delay minimization algorithm installed in the system. That is, the system compares the channel of the target base station requesting the handoff in the routing update message with the channel currently being serviced when requesting a handoff from the terminal, and determines whether the handoff is a different version, that is, 1xEV- And the 1xEV-DO Rev. 0 base station are in a hard hand-off manner, and triggers the delay minimization algorithm according to the result.

1 is a diagram illustrating an example of a system to which a method of triggering a delay minimization algorithm for hard handoff using a channel record 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 channel record in a CDMA2000 1xEV-DO system according to a preferred embodiment of the present invention is applied is shown in Rev.A and Rev. 1xEV- It is applied to a system composed of a mixture of .0 systems.

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. The PDSN 160 is connected to the BSs 120 and 130 through the PCF 150 and provides packet data services to the MS 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 only through one FA. At this time, according to the present invention, the system designates boundary Rev. A base stations between Rev.A and Rev. 0 as boundary cells.

When the UE 110 moves from the Rev. A base station 120 to the Rev.0 base station 130, the UE 110 determines a handoff. Then, the terminal 110 generates a route update message for handoff and sends the route update message to the Rev. A base station 120.

Then, the system detects PN and channel records of the target base station included in the route update message according to the present invention, and compares the detected channel with the current channel. The system determines that the handoff is a handoff between the Rev. A base station and the Rev. 0 base station when the current channel and the requested channel are different from each other as a result of the comparison, and triggers the hard handoff delay minimization algorithm Thereby minimizing other deterioration in the handoff.

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, a handoff is determined as the terminal 110 moves from the source base station 120 of Rev. A to the target base station 130 of Rev.0 (S1).

When the handoff is determined, the terminal 110 generates a route update message and transmits the generated route update message to the source base station 120 of Rev. A (S2).

In this case, the Rev. A base station 120 designated as a boundary cell receives a route update message for handoff from the terminal 110. The system detects a PN and a channel record included in the route update message (S3).

The system then channels to the target base station detected in step S3) (S4).

If it is determined that the channel is different from the current channel in Rev. 0 of the target base station as a result of the comparison in step S4, the system determines that the handoff is a hand-off from Rev.A to Rev.0 (S5).

As a result of the determination in step S5), if the other version of the handoff (i.e., the handoff is a handoff from Rev.A to Rev.0), the system triggers to activate the delay minimization algorithm preinstalled in the system S6).

Therefore, when the 1xEV-DO terminal in the border region of CDMA2000 1xEV-DO Rev.0 and Rev.A determines handoff method at handoff from 1xEV-DO Rev. A base station to 1xEV-DO Rev.0 base station , It is possible to minimize the degradation of the call quality due to hard handoff from the 1xEV-DO Rev. A base station to the 1xEV-DO Rev. 0 base station by appropriately triggering the driving of the hard handoff delay minimization algorithm installed in the system 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.

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

FIG. 2 is a flowchart illustrating an operation of the system shown in FIG. 1. FIG.

Claims (10)

  1. A method for triggering a delay minimization algorithm of a hard handoff using a channel record in a CDMA2000 IxEV-DO system,
    a) determining a handoff at a terminal; And
    b) a route update message is generated from the terminal. Wherein the system includes triggering a hard handoff delay minimization algorithm based on a channel record included in the route update message and a channel of a target base station requested to be handed off. ≪ RTI ID = 0.0 > Wherein the method further comprises the steps of:
  2. The method of claim 1, wherein step b)
    b-1) receiving a route update message for handoff from the terminal; Comparing a channel record of a target base station requested to be handed off included in the route update message with a current channel; And
    b-2) Based on the result of the comparison in step b-1), if the current channel is different from the channel of the target base station, it is determined to be a handoff between the Rev. A base station and the Rev.0 base station, Wherein the system comprises the step of triggering a hard handoff delay minimization algorithm in a CDMA2000 IxEV-DO system.
  3. 3. The method of claim 1 or 2, wherein the MS periodically updates the route update message in the CDMA2000 IxEV-DO system.
  4. 4. The CDMA2000 IxEV-DO system according to claim 3, wherein the update of the route update message of the MS is performed according to channel information indicated on a neighbor list (Neighbor List) A method for triggering a minimization algorithm.
  5. A method for triggering a delay minimization algorithm of a hard handoff using a channel record in a CDMA2000 IxEV-DO system,
    a) determining a handoff at a terminal;
    b) transmitting a route update message from the terminal to the source Rev. A base station according to the decision of step a);
    c) receiving a route update message from the terminal. Comparing the PN and channel records of the target base station included in the route update message with the current channel in the system;
    d) determining that the handoff is a handoff from Rev.A to Rev. 0 if it is determined to be a channel different from the current channel as a result of the comparison in step c); And
    e) in the case of a different version of the handoff as a result of the determination in step d), the system comprises triggering a hard handoff delay minimization algorithm. In a CDMA2000 IxEV-DO system, Off < / RTI >
  6. In a CDMA2000 1xEV-DO system,
    A terminal for determining a handoff and generating a route update message; And
    A base station for triggering a hard handoff delay minimization algorithm based on a channel record included in the route update message and channel information of a target base station requested to be handed off;
    Wherein the base station is a source base station that supports communication to the MS before determining a handoff in the MS. The CDMA2000 1xEV-DO system that triggers a hard handoff delay minimization algorithm using channel records .
  7. The method according to claim 6,
    The base station receives a route update message for handoff from the terminal. If the handoff is different from the current channel by comparing the channel record of the target base station requested to be handed off included in the route update message with the current channel and if the current channel is different from the channel of the target base station based on the comparison result, The handoff delay minimization algorithm is triggered according to a result of the determination. The CDMA2000 1xEV-DO system triggers the hard handoff delay minimization algorithm using a channel record.
  8. 8. The method according to claim 6 or 7,
    Wherein the MS updates the route update message periodically. The CDMA2000 1xEV-DO system triggers a hard handoff delay minimization algorithm using a channel record.
  9. 9. The method of claim 8,
    The CDMA2000 1xEV-DO system for triggering a hard handoff delay minimization algorithm using a channel record, wherein the update of the route update message of the MS is performed according to channel information indicated on a neighbor list (Neighbor List).
  10. In a CDMA2000 1xEV-DO system,
    A terminal for determining a handoff and generating a route update message; And
    If the handover is determined to be a channel different from the current channel, the handover is performed between the Rev. A base station and the Rev. 2.0 base station, And a base station for triggering a hard handoff delay minimization algorithm;
    Wherein the base station is a source base station that supports communication to the MS prior to determining a handoff at the AT. The CDMA2000 1xEV-DO system.
KR1020080038389A 2008-04-24 2008-04-24 METHOD FOR MINIMIZING DELAY OF HARD HAND OFF THAT USES CHANNEL RECORD IN CDMA2000 1xEV-DO SYSTEM, AND SYSTEM TO THE SAME KR101453986B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003506983A (en) 1999-08-11 2003-02-18 クゥアルコム・インコーポレイテッド Method and system for performing a handoff in a wireless communication system, such as a hard handoff
JP2005525713A (en) 2001-08-17 2005-08-25 クゥアルコム・インコーポレイテッドQualcomm Incorporated METHOD AND APPARATUS related reduction in call setup latency
JP2006520573A (en) 2003-03-13 2006-09-07 クゥアルコム・インコーポレイテッドQualcomm Incorporated Method and system for data transmission in a communication system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003506983A (en) 1999-08-11 2003-02-18 クゥアルコム・インコーポレイテッド Method and system for performing a handoff in a wireless communication system, such as a hard handoff
JP2005525713A (en) 2001-08-17 2005-08-25 クゥアルコム・インコーポレイテッドQualcomm Incorporated METHOD AND APPARATUS related reduction in call setup latency
JP2006520573A (en) 2003-03-13 2006-09-07 クゥアルコム・インコーポレイテッドQualcomm Incorporated Method and system for data transmission in a communication system

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