KR100654540B1 - Handoff method on the dormant state performed without traffic connection - Google Patents

Abstract

The present invention relates to a handoff method that can be performed without a call connection in a dormant state, wherein a mobile communication terminal is in a dormant state (Dormant state) by a packet zone identifier (PZID) or a system identifier (SID) or a network. If it detects that the identifier has changed, it sends a data burst message to the new network through the access channel to handoff without connecting the traffic channel. It notifies that the network has been moved, and the new network that receives it registers the mobile communication terminal and processes the PPP session connection between the mobile communication system and the new network without a traffic channel connection. Wastes communication resources by allowing easy handoff without connecting traffic channels It is to prevent the.

Mobile Terminal, Dormant State, Handoff

Description

Handoff method on the dormant state performed without traffic connection}

1 is a flowchart of a handoff operation performed after a call connection in a conventional idle state.

2 illustrates an example of a data burst message;

3 is a flowchart according to an embodiment of a handoff method that can be performed without call connection in an idle state according to the present invention;

<Explanation of symbols for main parts of the drawings>

100: mobile communication terminal

200: new network (BTS / BSC / PCF / PDSN)

300: existing network (BTS / BSC / PCF / PDSN)

The present invention relates to a handoff method that can be performed without a call connection in a dormant state, and in particular, when a mobile communication terminal performs a handoff in a dormant state (Dormant), a handoff is simply performed without connecting a traffic channel. And a handoff technique capable of preventing communication resource waste.

As the mobile terminal close to base station A (current base station) approaches base station B (new base station), the signal strength of base station B becomes larger than that of base station A. Therefore, the call connected to base station A must be switched to base station B. Will remain uncut. Since the signal strengths of the two base stations are similar in the middle portion of the base station A and the base station B, the call may be connected to either side, and the handoff procedure is performed in this process.

The subject of the handoff is the mobile communication terminal. That is, the time of performing handoff is made by the determination of the mobile communication terminal side. Since the mobile communication terminal must always grasp the access to the neighboring base station (Neighbor Base Station), the mobile station must continuously search for the pilot channel signal strength (E _C / I _O ) of the neighboring base stations. This process is referred to as pilot search, which means that while the mobile terminal is powered on regardless of a call, that is, in a standby state in which both a traffic channel and a PPP session are released. Idle State, Traffic Channel is released, and PPP Session is continued during Active State with both connected Dorm State, Traffic Channel, and PPP Session connected. To be performed.

1 is a flowchart of a handoff operation performed after a call connection in a conventional idle state.

In a conventional case, a traffic channel is released and a PPP session is connected to a dormant state, whereby a mobile communication terminal receives a packet zone identifier (PZID) or system identifier (SID). ) Or when the Network Identification is changed, the mobile terminal 100 fills the field value of the Data Ready to Set (DRS) field in the Origination Message with '0' and then adds a new network ( When attempting to connect a packet data call to the packet data call (S110) (S110), the new network 200 allocates a traffic channel to the corresponding mobile communication terminal (S120), and the new network and the mobile communication terminal. By connecting a PPP session between the mobile station and assigning a mobile IP (S130), the mobile communication terminal is switched to an active state, and a new network receives information from the mobile communication terminal. And then registering the end of the new network, release the traffic channel (Traffic Channel) and after the step of switching (S140) back to the dormant state (Dormant) was performed a handoff (Handoff) procedures in idle state (Dormant State).

However, this conventional method requires a mobile communication terminal to be allocated a traffic channel during handoff, thus causing unnecessary waste of communication resources due to unnecessary data call connection, and the mobile communication terminals frequently move several times in a short time. When the handoff procedure is performed, a number of data call connection attempts occur, which causes unnecessary operation.

Accordingly, the present invention connects a call in a dormant state where the mobile communication terminal can prevent communication resource wastage by simply performing a handoff without connecting a traffic channel when the handoff is performed in a dormant state. The study of the handoff method that can be performed without.

The present invention has been invented under the above-described aspect, and when the mobile communication terminal performs a handoff procedure in a dormant state, communication is performed by simply performing a handoff without connecting a traffic channel. An object of the present invention is to provide a handoff method that can be performed without call connection in an idle state that can prevent resource waste.

According to an aspect of the present invention for achieving the above object, the handoff method that can be performed without a call connection in the idle state according to the present invention, the mobile communication terminal in the dormant state (Dormant State) packet zone identifier (PZID: Packet Zone) Access to a data burst message for handoff without a traffic channel connection if it detects that the Identification or System Identification or Network Identification has changed Notify that the new network has been transferred to the new network through an access channel, and the new network that receives it registers the mobile communication terminal and connects the mobile communication system with the new network without a traffic channel connection. PPP session connections are handled without the need to connect traffic channels. It is characterized in that the handoff can be performed.

Accordingly, the present invention can simply perform a handoff without connecting a traffic channel during a handoff in a Dormant state, thereby preventing communication resource waste.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

First, before describing a handoff method that can be performed without call connection in the dormant state according to the present invention, in the present invention, a new type used for handoff without call connection in the dormant state is used. Defines a data burst message.

A new type of Data Burst Message, used to handoff without a call connection in the Dormant State, is defined in TSB58 (Parameter Value Assignments for TIA / EIA Wideband Spread Spectrum Standards). It can be implemented by extending the data burst.

2 is a diagram illustrating an example of a data burst message.

As shown in the figure, a Data Burst Message is a field (MSG_TYPE) indicating that the message is used for handoff without call connection in a Dormant State, and Layer 2 in IS-2000. Fields for signaling (Layer 2 Signaling) (ACK_SEQ, MSG_SEQ, ACK_REG, VALID_ACK, ACK_TYPE), fields containing identification information of the terminal sending the message (MSID_TYPE, MSID_LEN, MSID), and for the terminal sending the message Contains fields related to authentication (AUTH_MODE, AUTHR, RANDC, COUNT), fields containing message attribute information (MSG_NUMBER, BURST_TYPE, NUM_MSGS, NUM_FIELDS), and messages written in higher layers. Contains a field CHARI.

Accordingly, the mobile communication system identifies the message used for handoff without call connection in the dormant state by referring to field values included in the data burst message defined above.

3 is a flowchart according to an embodiment of a handoff method that can be performed without call connection in an idle state according to the present invention.

When the mobile terminal in the dormant state enters a new area, while the mobile terminal is in the ON state, the reception power sensitivity of the neighbor base stations is monitored through a pilot channel. The mobile communication terminal detects that a packet zone identifier (PZID), a system identifier (SID) or a network identifier (Network Identification) has been changed.

Then, in the handoff notification step (S210), the mobile communication terminal 100 transmits a data burst message used for handoff without a call connection defined above through an access channel. (BTS / BSC / PCF / PDSN) 200 to notify that it has moved to the new network.

That is, the access channel is a reverse link for transmitting a signal from the mobile communication terminal to the mobile communication system. When the data is transmitted through the access channel, the access channel is a separate traffic channel. Data is transferred without assigning

Then, the new network (BTS / BSC / PCF / PDSN) 200 receives the data burst message transmitted from the mobile communication terminal by the handoff notification step (S210), and the PPP session processing step ( The mobile communication system side handoff procedure including registering the corresponding mobile communication terminal in S220 and connecting a PPP session between the mobile communication system 100 and the new network 200 without a traffic channel connection. Perform

At this time, the new network transmits a response message to the corresponding mobile communication terminal through a paging channel, which is a forward link, and the mobile communication terminal receiving the response message performs a handoff procedure on the mobile communication terminal side. Accordingly, handoff is easily performed in a dormant state without allocating a traffic channel between the mobile communication terminal and the new network.

On the other hand, according to an additional aspect of the present invention, the handoff method that can be performed without a call connection in the dormant state according to the present invention allocates a new mobile IP to the corresponding mobile communication terminal in a new network, and the IP allocation information is transferred to the data burst. In addition to the message (Data Burst Message) may further include an IP allocation step (S230) for transmitting to the mobile communication terminal via a paging channel (Paging Channel).

Accordingly, the mobile IP can be assigned to the mobile communication terminal that is easily handed off without allocating a traffic channel between the mobile communication terminal and the new network, thereby enabling an IP-based data packet service.

Meanwhile, according to an additional aspect of the present invention, when a packet data serving node (PDSN) is changed by handoff in the PPP session processing step (S220), a new network sends new PDSN information to the data burst message (Data). It may further include transmitting to the mobile communication terminal through the paging channel (Paging Channel) in addition to the burst message.

That is, in this case, a hand in a special situation in which a packet data serving node (PDSN) is changed, not a normal handoff in which a packet data serving node (PDSN) is not changed and only a base transceiver system (BTS) is changed. For handling off, and when a new packet is changed to a new packet data serving node (PDSN) by handoff, the new network includes the new PDSN information in the data burst message and paging channel. By transmitting to a corresponding mobile communication terminal through a channel, a handoff operation between PDSNs in a dormant state can be easily performed without allocating a traffic channel.

On the other hand, according to an additional aspect of the present invention, the data burst message (Data Burst Message) in response to a specific request from the new network in the Dormant (Dormant State) response to the mobile terminal through the Access Channel (Access Channel) It can also be used as a response message.

That is, the mobile communication terminal performs information exchange except for a busy channel without assigning a traffic channel through an access channel, which is a reverse link. Therefore, when a specific request command is transmitted in a new network during the Dormant State, the Dormant State is generated by responding through the Access Channel using the Data Burst Message defined above. Respond to specific requests from new networks.

Therefore, the above handoff method which can be performed without call connection in the dormant state according to the present invention can achieve the above object.

As described above, in the idle state according to the present invention, a handoff method that can be performed without a call connection is performed when a mobile communication terminal performs a handoff procedure in a dormant state. By implementing simple handoff without connection, traffic channel allocation, which is a problem of handoff in a conventional dormant state that registers a new network after connecting a traffic channel, is performed. Has a useful effect of preventing communication resource waste.

While the invention has been described with reference to the preferred embodiments, which are referred to by the accompanying drawings, it is apparent that various modifications are possible without departing from the scope of the invention within the scope covered by the following claims from this description. .

Claims (5)

In the handoff method between a mobile communication terminal and a mobile communication network, When the mobile station detects that a packet zone identifier (PZID), a system identifier (SID), or a network identifier (network identification) has been changed in a dormant state, a traffic channel A handoff notification step of notifying that the data burst message for handoff without connection is transmitted to the new network through an access channel; The new network receiving the data burst message transmitted by the handoff notification step registers the mobile communication terminal, and the PPP session between the mobile communication system and the new network without a traffic channel connection ( Session) PPP session processing step of processing the connection; A handoff method which can be performed without call connection in the dormant state. The method of claim 1, The handoff method which can be performed without call connection in the idle state is: The new network assigns a new mobile IP to the mobile communication terminal, and includes the IP allocation information in the data burst message to transmit the mobile terminal to the mobile communication terminal through a paging channel. A handoff method that can be performed without a call connection in the idle state further comprising. The method of claim 2, In the PPP session processing step: When a packet data serving node (PDSN) is changed by handoff, a new network transmits a new PDSN information to the corresponding mobile communication terminal through a paging channel by including new PDSN information in the data burst message. A handoff method which can be performed without call connection in the dormant state, further comprising. The method according to any one of claims 1 to 3, The Data Burst Message is: A new type used for handoff without call connection in the Dormant state, which is implemented by the extension of Data Burst defined in Parameter Value Assignments for TIA / EIA Wideband Spread Spectrum Standards (TSB58). A handoff method which can be performed without a call connection in an idle state, characterized in that it is a Data Burst Message of Type. The method of claim 4, wherein The Data Burst Message is: A handoff method that can be performed without a call connection in a dormant state, wherein the mobile communication terminal is used as a response message responding to a specific request from a new network in a dormant state through an access channel. .

Images