KR100622911B1 - Management method soft hand over method for w-cdma terminal - Google Patents

Abstract

The present invention relates to a method for processing soft handover of an asynchronous code division multiple access terminal, wherein a 3G asynchronous code division multiple access terminal has a neighboring cell above an additional limit or a cell belonging to an active set below a deletion limit when using a 3G communication service If the measurement report is sent to the network, the measurement report message is transmitted to the network, and if the active set update message for soft handover is delayed from the network, the co-pilot channel reception level status of the cell to be added and the cell to be deleted is By reconfirming, it is possible to prevent service interruption due to soft handover delay by transmitting an active set update failure message to the network.

Mobile terminal, 3G, WCDMA, cell, soft handover

Description

MANAGEMENT METHOD SOFT HAND OVER METHOD FOR W-CDMA TERMINAL}

1 is a diagram illustrating a handover process according to a conventional 3GPP specification;

2 is a block diagram of a 3G WCDMA terminal according to the present invention;

3 is a diagram illustrating a soft handover process of a 3G WCDMA terminal according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: duplexer 20: transmitter

30: receiver 40: audio unit

50: control unit 60: key input unit

70: memory 80: display

The present invention relates to a method for processing soft handover of an asynchronous code division multiple access terminal. More particularly, the present invention relates to a soft handover message delayed from a network when a communication service is used in a 3G WCDMA terminal. It is sending a L message.

Maintaining traffic connection of the mobile subscriber is made possible by the handover function. The basic concept of the handover is simple. When the subscriber's mobile station (mobile phone, wireless Internet device, portable device, personal digital assistant, etc.) moves from one cell of the system to another in a mobile communication system, a new connection with a new cell is established and the old cell Must be disconnected.

Depending on the diversity used, the handover mechanism can be classified into hard handover, soft handover and softer handover. Simultaneous soft and softer handover processing is referred to as soft-softer handover. All of these are typically provided by third generation (3G) mobile systems.

1 is a flowchart of a handover operation according to a conventional 3GPP (3rd Generation Partnership Project) specification, and as shown in FIG. 1, a service of a neighbor cell 1 is used while using a service through active set cells 2, 3, and 4. Events where the pilot channel (CPICH) reception measurement level is higher than the threshold for addition or the common pilot channel (CPICH) reception measurement level of cell 2 in the active set is lower than the threshold for deletion. If occurs, the mobile communication terminal sends a measurement report message (MEASUREMENT REPORT MESSAGE) to the network (S100).

However, due to the delay of the message active set update (S110) for soft handover received from the network due to a radio environment or the like, at the time of receiving the message, the co-pilot channel reception level of the cell 1 has already dropped sharply. If the discarded state or the co-pilot channel reception level of the cell 2 is improved again, and the cell 1 is added to the active set or the cell 2 is deleted according to the implementation of the 3GPP specification (S120), then the mobile communication terminal and the network There is a problem that the current service is stopped because the Tx / Rx level is not good.

Accordingly, an object of the present invention is to solve the above-described problems, and an object of the present invention is to transmit a measurement information between cells to a network and to receive a soft handover message from the network after a certain time delay. The present invention provides a soft handover processing method of an asynchronous code division access terminal that continuously transmits a failure message for a soft handover message to a network while maintaining a current cell state.

In the soft handover processing method of the asynchronous code division access terminal for achieving the object of the present invention as described above, the co-pilot channel reception level measurement information of the neighbor cell during the use of the communication service of the mobile communication terminal is above the cell addition limit, or The channel reception level of a cell belonging to the active set is measured to be equal to or lower than a cell deletion threshold, thereby transmitting a measurement report message to a network, and an active set update message for soft handover according to the measurement report message is delayed from the network. Reconfirming the common pilot channel reception level status of the neighboring cell to be added and the active set cell to be deleted if the neighboring cell to be added and the common pilot channel reception level status of the cell are converted, the active set to the network Send update failed message It may comprise the steps:

Preferably, when the active set update failure message is transmitted, the active set state with the currently connected cell is maintained.

DETAILED DESCRIPTION Hereinafter, an asynchronous code division multiple access terminal and a soft handover processing method according to a preferred embodiment of the present invention will be described in detail.

2 is a configuration diagram of a 3G WCDMA terminal according to the present invention, wherein a mobile communication terminal using a service through the third generation network includes a duplexer 10, a transmitter 20, a receiver 30, an audio unit 40, and a controller. 50, a key input unit 60, a memory 70, and a display unit 80.

The duplexer 10 communicates with the base station through the antenna ANT to transmit a signal from the transmitter 20 to the base station through the antenna ANT, and receives a signal from the base station through the antenna ANT. 30 to be received.

The transmitter 20 transmits the modulated radio signal from the audio unit 40 to the duplexer 10, and in particular, transmits an active set update message transmitted from a network under error control by the controller 50.

The receiver 30 is controlled by the controller 50 and receives a radio signal output from the duplexer 10.

The audio unit 40 is controlled by the control unit 50, modulates the voice signal input through the microphone (MIC) into a wireless signal, demodulates the wireless signal received through the receiver 30 to the speaker (SPK) Is transmitted as a voice signal.

In addition, the audio unit 40 detects the ring signal through the receiver 30 when a ring signal is generated from the base station and outputs a corresponding ring tone.

The key input unit 60 includes a numeric key, a voice mail switch key, and various function keys. When the user presses a predetermined key, a key input signal is generated and output to the controller 50.

The display unit 80 is controlled by the controller 50 and displays a key input signal generated by the key input unit 60 and various information signals from the controller 50 on the screen.

The control unit 50 controls the general operation of the mobile communication terminal, but if the active set message sent from the network sends a measurement report message and arrives with a delay for a predetermined time, receiving a common pilot channel of a cell currently in service After reconfirming the level, according to the result, an active set message transmission error message is transmitted to the network while maintaining an active set state.

The memory 70 stores a predetermined program for controlling the overall operation of the mobile communication terminal, and stores various data input / output and processing while the program is being executed.

3 is a diagram illustrating a soft handover process of a 3G WCDMA terminal according to the present invention.

As shown in FIG. 3, in the method for processing a soft handover of the mobile communication terminal, the mobile communication terminal receives a common pilot channel of the neighboring cell 1 while using the communication service through the active set cells 2, 3, and 4. If the CPICH measurement information is greater than or equal to the cell addition threshold or if the common pilot channel reception level (CPICH) of cell 2 belonging to the active set is less than or equal to the cell deletion threshold, In step S200, the MEASUREMENT REPORT message is transmitted.

The network receiving the measurement report message creates an active set update message for soft handover based on the measurement information between cells transmitted from the mobile communication terminal and transmits the generated active message to the mobile communication terminal (S210).

For example, the active set (active set) currently being used by the mobile terminal was cells 2, 3, and 4, but neighboring cell 1 was measured as an additional cell due to the movement of the user, and cell 2 belonging to the active set was deleted. When measured by a cell, the mobile communication terminal transmits the measured cell information through a network.

Then, the network transmits an active set update message (add cell 1, delete cell 2) for soft handover through inter-cell measurement information of the mobile communication terminal.

At this time, if the active set update message transmitted to the mobile terminal is delayed and transmitted by the user's movement, the reception level of the common pilot channel (CPICH) of cell 1 provided as an additional cell to the active set update message transmitted from the network is sharply dropped. There is a case where the state is already changed to a state below the removal threshold or the common pilot channel reception level (CPICH) of the cell 2 provided as a cell to be deleted is improved again so as to be converted to a state above the threshold to be added.

 In this case, the conventional mobile communication terminal uses cells 1, 3, and 4 as active set cells by adding cell 1 and deleting cell 2 according to the active set update message. When the state of the co-pilot channel reception level of the first and the cell 2 is re-checked and there is a change in the level state, an active set update failure message is transmitted to the network (S230).

In this case, the mobile communication terminal can continuously use the active set state with the cells 2, 3, and 4 used as the active set and receive the service, thereby continuing to use the service without interruption.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the spirit of the present invention as claimed in the claims. Of course, any person skilled in the art can make various modifications, and such changes are within the scope of the claims.

According to the present invention as described above, by applying an error recovery routine in the soft handover process of the 3G asynchronous code division multiple access terminal, it is possible to prevent accidents such as disconnection and interruption of data transmission in a specific situation, the user is more stable You can use the service.

Claims (4)

When the channel reception level measurement information of the neighboring cell exceeds the cell addition limit during the use of the communication service of the mobile communication terminal, transmitting a measurement report message to the network;  Reconfirming the co-pilot channel reception level status of the neighboring cell to be added in consideration of the case where the active set update message is delayed when the active set update message is transmitted from the network; And And transmitting an active set update failure message to the network when the co-pilot channel reception level state of the cell is changed. The method of claim 1, Transmitting a measurement report message to a network if the channel reception level of a cell belonging to the current active set is less than the cell deletion threshold during the use of the communication service of the mobile communication terminal; And re-confirming the common pilot channel reception level status of the active set cell to be deleted, wherein the soft handover of the asynchronous code division multiple access terminal is performed. The method of claim 1, Soft handover processing method of an asynchronous code division multiple access terminal, characterized in that when the active set update failure message transmission, maintains the active set state with the currently connected cell. The method of claim 1, And a failure message is transmitted to the network when the active set update message for soft handover is delayed and transmitted according to the measurement report message.

Images