KR100308810B1 - Method for converting calling channel between frequencies using power measurement report message and round-trip delay message - Google Patents

Abstract

PURPOSE: A method for converting a calling channel between frequencies using a power measurement report message and a round-trip delay message is provided to process a traffic channel conversion between different frequencies using a software by using a PARM(Power Measurement Report Message) and an RTD(Round Trip Delay message) without installing an unnecessary hardware. CONSTITUTION: If a channel processing unit of a control station receives a PARM from a mobile station, a power measurement report message counter value is increased one by one(S1). If the power measurement report message counter value is more than a set receiving number, and if an error rate of the power measurement report message is more than a set critical value, and if a calling pilot intensity is less than a set critical value, and if the current round trip delaying message value is more than a round trip delaying message value at the initial state, calling channel conversion starting information is transmitted to a call processing unit(S2).

Description

Frequency channel switching method using power measurement report message and round-trip delay message

1 is a block diagram of a general code division multiple access system.

2 is a flowchart of a method for switching a channel between frequencies according to the present invention.

Explanation of symbols on the main parts of the drawings

10: mobile station 20: base station

30 control station 31 channel processing unit

40: exchange station C: cell

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to handoff between frequency channels in a code division multiple access (CDMA) mobile communication system, and in particular, a power measurement report (PMRM) without installing a separate hardware device. Message and Round-Trip Delay Message (RTD) relates to a method for software to handle hard handoff between different frequencies.

In general, an exchange in a mobile communication system transfers a call path between a mobile station and a base station by controlling a signal channel or a call channel so that a call can be maintained continuously when a subscriber leaves the service area of a base station or sector currently receiving a service. Communication channel switching technology.

Conventionally, a hardware method of installing a dummy pilot in which a traffic channel does not exist and a pilot exists in a destination cell is used as a method of switching between communication channels between different frequencies. Therefore, when the channel processing unit of the control station receives a report from the mobile station that the pilot of the destination is received above the threshold, the pilot cell of the destination cell knows that there is no resource (base station traffic channel card), and the frequency of the destination cell that is not the same as the frequency of the calling cell. A method of instructing call channel switching is used.

However, according to the conventional call channel switching method described above, since a destination cell uses a pilot transmission board without actual resources, up to 10 frequencies can be used per base station, even though two or three frequency channels are actually used. Up to 10 boards were required, which caused a lot of expense.

Accordingly, the present invention is economical by enabling the processing of the call channel switching between different frequencies in software by using the power report message and the round-trip delay message without installing unnecessary hardware in performing the call channel switching between different frequencies. There is an advantage to increase.

That is, in a code division multiple access mobile communication system comprising a mobile subscriber station (mobile pole), a mobile base station connecting a mobile station and a mobile telephone exchange station, and a mobile telephone switching station that processes incoming and outgoing calls at each base station. If it is determined that the mobile station is moving from the cell to which the mobile station belongs to the neighboring destination cell by measuring the round-trip delay message of the base station, the power report message of the mobile station, the error rate, and the pilot strength, the call processing unit of the control station performs the inter-frequency call channel switching. It is to transmit the information to perform the call channel switching instruction.

Hereinafter, a schematic configuration of a code division multiple access mobile communication system in which the present invention is performed will be described with reference to the accompanying drawings.

As shown in FIG. 1, a cell which connects a mobile station 10, which is a subscriber station such as a car phone or a mobile phone, with the mobile station 10 and a control station 30 to transmit and receive various signal information through a data link ( A control station 30 having a base station 20, a channel processing unit 31, and a call processing unit (not shown), which process traffic channels and calls received from and to the switching center 40, It consists of an exchange station 40 that handles calls to and from the base station 20 and performs a central control function and a charging data collection function for the completed call so that all the base stations 20 can be efficiently operated.

In the mobile communication system configured as described above, a method for switching a frequency channel call channel using a power measurement report message and a round-trip delay message will be described with reference to FIG. 2.

Since the dummy pilot without resources is not installed in the destination cell C adjacent to the cell C to which the current mobile station 10 belongs, even if the mobile station 10 in the call continues to move outside the current cell C Since the pilot quality of the adjacent cell is not detected and the call quality gradually decreases, the mobile station 10 transmits a power measurement report message indicating that the received frame is poor to the channel processor 31 of the control station 30.

Meanwhile, the base station 20 of the cell C to which the mobile station 10 belongs currently checks whether the base station 20 is greater than or equal to the round-trip delay message value of the first call connection point by using the round-trip delay message every 500 msec. The distance between the mobile station 10 and the base station 20 is transmitted to the control station 30 using a round-trip delay message.

Then, after the channel processor 31 of the control station 30 receives the power measurement report message from the mobile station 10, the power measurement report message-counter only when the round-trip delay message is larger than the minimum cell radius. (N) is increased by one (S1).

Thereafter, the channel processor 31 of the control station 30 receives the number of receptions of the power measurement report message indicating that the reception frame is bad, the error rate of the power measurement report message generated during communication with the mobile station 10, Using the strength and round-trip delay messages, it is determined whether the mobile station 10 in the call is outside the cell C to which it belongs (S2).

In this case, when the mobile station 10 is located outside the cell C to which the mobile station 10 currently belongs in the second step S2, the number of reception of the power measurement report message is greater than 5 times, and the power measurement report message is received. The error rate is greater than '10 ^-6 ', the strength of the busy pilot is less than' 16dB ', and the current round-trip delay message value is more than the round-trip delay message value at the beginning of the first call.

If it is determined in the second step (S2) that the inter-frequency talk channel switching is necessary, the channel processing unit 31 of the control station 30 transmits the inter-frequency talk channel switching information to a call processing unit (not shown).

At this time, the channel processing unit 31 of the control station 30, if the round-trip delay message is less than the minimum cell radius when the call is initiated or during a call, this is not a bad reception frame due to movement outside the cell (C) It does not transmit the communication channel switching performance information between frequencies in consideration of the decrease of radio wave due to reflection by surrounding buildings, houses or features.

As described in detail above, the present invention can significantly reduce the waste of cost due to unnecessary hardware installation by processing the communication channel switching method between frequencies using a power measurement report message and a round-trip delay message. It works.

Claims (2)

1. A method for switching a frequency-to-frequency call channel, comprising: a first step (S1) of incrementing a power measurement report message-counter one by one when a channel processor of a control station receives a power measurement report message from a mobile station; The threshold value of the power processing report message-counter of the control station is greater than the set number of reception times, the error rate of the power measurement report message is smaller than the set threshold value, and greater than the set threshold value. If the current round-trip delay message value is more than the round-trip delay message value at the beginning of the first call, it is returned if any of the conditions are not satisfied, and if all the conditions are satisfied, the call channel is switched to the call processor. A method of switching a communication channel between frequencies using a power measurement report message and a round-trip delay message, wherein the power measurement report message is sequentially operated in a second step S2 of performing information transmission. The method of claim 1, wherein the increase of the power measurement report message-counter in the first step is periodically received by the round-trip delay message, and the counter value is increased only when the value is larger than the minimum cell radius, thereby moving to another cell. A method of switching a channel between frequencies using a power measurement report message and a round-trip delay message, characterized in that it is possible to distinguish a decrease in propagation caused by other causes.