KR20040036863A - Method for transmitting measurement report message in universal mobile telecommunication systems - Google Patents

Abstract

The present invention relates to a method for transmitting a measurement report message in an asynchronous mobile communication system, wherein the priority of each measurement type is set by the mobile terminal based on handover related quality and importance for events related to handover. Determining whether the plurality of events related to the handover are triggered together within a preset period and the plurality of measurement results related to the handover satisfy the reporting criteria, and the plurality of measurement results related to the handover meet the reporting criteria. The mobile station sequentially transmits the measurement report messages according to the set priority of the measurement type to the radio access system.

Description

METHODS FOR TRANSMITTING MEASUREMENT REPORT MESSAGE IN UNIVERSAL MOBILE TELECOMMUNICATION SYSTEMS}

The present invention relates to a mobile communication system, and more particularly to a method for transmitting a measurement report message in an asynchronous mobile communication system.

Today, with the rapid growth of the mobile communication industry, mobile communication systems are evolving into next generation mobile communication systems that can provide not only voice services but also data and video services. These mobile communication systems are largely divided into a synchronous method adopted by the US and an asynchronous method adopted by the European. Currently, standardization work in mobile communication systems is progressing in different forms due to conflicting opinions between synchronous and asynchronous methods. Among these two methods, the asynchronous mobile communication system adopted in Europe is called UMTS (Universal Mobile Telecommunication Systems).

The UMTS system includes a user equipment (UE), which is a mobile terminal, and a UMTS Terrestrial Radio Access Network (UTRAN), which is a UMTS radio access system, each of which has a protocol layer composed of a plurality of layers. The RRC layer of each of the UE and the UTRAN controls radio resource (eg, code, frequency, timeslot, mapping, etc.) allocation for the UE, and transmits and receives various signal messages. In addition, each RRC layer of the UE and the UTRAN mediates between a user and a radio bearer layer through the radio resource allocation. In addition, each RRC of the UE and the UTRAN checks through a measurement using a lower layer which radio resources are available. In order for this to be possible, a measurement report from the UE RRC layer to the UTRAN RRC is required.

In Figure 1, according to the prior art, each RRC of the UE and the UTRAN checks through the measurement (measurement) using the lower layer of the UE, and according to the result, the UE is a control device in SRNC (Serving Radio) It shows communication protocol to transmit measurement report message to Network Controller.

In the prior art illustrated in FIG. 1, the RRC (hereinafter referred to as "SRNC-RRC") of the Serving Radio Network Controller (SRNC), which is a control device in the UTRAN, is referred to as the RRC (hereinafter referred to as "UE-RRC") of the mobile terminal UE. If the reporting criterion of the message "MEASUREMENT CONTROL" transmitted to 20) is an event triggering method, the UE-RRC 20 measures the number of events that satisfy the event triggering criteria. MEASUREMENT REPORT is a method of sending a message.

Referring to FIG. 1, in more detail, the SRNC-RRC 30 may transmit a “MEASUREMENT CONTROL” message to the UE-RRC (100) in order to enable the mobile station 10 to measure radio resources in step 100 of FIG. 1. 20). In response to this, the UE-RRC 20 transmits a "CPHY_Measurement-REQ" message, which requires the UE-L1 26 to measure radio resources, in step 102 of FIG. 1 (hereinafter, referred to as "UE-L1: 26"). In response to receiving the "CPHY_Measurement-REQ" message, the UE-L1 26 periodically measures a radio resource (steps 104 and 108 of FIG. 1) and contains the measurement result "CPHY_Measurement-IND". The message is transmitted to the UE-RRC 20 (steps 106 and 110 of FIG. 1). Accordingly, the UE-RRC 20 is contained in the "CPHY_Measurement-IND" message whenever a "CPHY_Measurement-IND" message is received. It is checked whether the measured result fulfills the reporting criteria, and if it satisfies the reporting criteria as in step 112 of FIG. 1, the UE-RRC 20 performs the "MEASUREMENT REPORT" as in step 114 of FIG. Message is sent to the SRNC-RRC (30).

In FIG. 1, up to 16 events related to handover are defined among the events defined as event triggering criteria. Among measurement types, measurement types related to handover include intra-frequency measurements, inter-frequency measurements, and inter-RAT (inter-radio access technology) measurements. The intra-frequency type is a measurement type related to handover between adjacent cells of the same frequency, and the inter-frequency measurement type is a measurement type related to handover between adjacent cells and other frequencies. The inter-RAT type is a measurement type related to handover between different radio access standards (GSM, CDMA2000, UMTS, etc.). There are a plurality of events in each of the intra-frequency, inter-frequency, and inter-RAT measurement types, and a handover of the sum of each of the plurality of events is posted. Up to 16 events related to.

According to the current 3GPP (MEASUREMENT REPORT) message format of the measurement report (MEASUREMENT REPORT) standard, the measurement report message is transmitted by the mobile terminal when one event is triggered for each measurement type. In other words, as shown in FIG. 1, in the prior art, when the reporting criterion of the "MEASUREMENT CONTROL" message is an event triggering method, the UE-RRC 20 simply sends a "MEASUREMENT REPORT" message as long as the condition specified in the corresponding event type is satisfied. Is transmitted to SRNC-RRC 30.

However, the conventional technology is that the UMTS system has been commercialized, so that many events may occur in areas where cells are complicated in the urban area or in unstable propagation environments, and according to various event triggering criteria (for example, event 1x, event 2x, and event 3x). As in step 112a of FIG. 2, a plurality of measurement report messages may be transmitted at the same time. A detailed implementation method thereof is not provided. Therefore, the implementation method for such a case is desired. It is also desirable to avoid excessive signaling load at the UE and UTRAN, which can be expected due to causing the multiple measurement report message transmissions.

Accordingly, an object of the present invention is to provide a method for efficient report message transmission in a mobile terminal RRC in an asynchronous mobile communication system.

Another object of the present invention is to transmit a measurement report message for transmitting a measurement report message by attaching importance when reporting conditions caused by a plurality of events at the same time when processing the measurement report message by the event triggering criteria in the asynchronous mobile terminal To provide a method.

According to the above object, the present invention provides a method for transmitting a measurement report message in an asynchronous mobile communication system, the measurement type based on the quality and importance of the handover for events related to handover by the mobile terminal A process of setting priorities for each star, determining whether a plurality of events related to handover are triggered together within a preset period, and determining a plurality of measurement results related to handover, and a plurality of measurement results related to handover. The mobile station sequentially transmits the measurement report messages according to the set measurement type priority according to the reporting criteria to the radio access system.

In addition, the present invention is a method for transmitting a measurement report message in an asynchronous mobile communication system, the intra-frequency measurement based on the handover-related quality and importance for events related to handover by the mobile terminal (intra-frequency) The process of setting the priority for each measurement type consisting of measurement, inter-frequency measurement, inter-RAT measurement (inter-RAT (Radio Access Technology) measurement), and a plurality of events related to handover are preset. Determining whether the plurality of measurement results related to the handover are triggered together within a period of time, and if the plurality of measurement results related to the handover satisfy the reporting criteria, the handover related to the plurality of measurement results related to the handover Change the priority of each set measurement type according to whether quality and importance conditions are satisfied. And a step of transmitting a measurement report message of each of the plurality of events related to the handover based on the checked priority of each measurement type to the wireless access system in sequence for each measurement type. do.

FIG. 1 is a diagram of a conventional RRC of a UE and a UTRAN to check which radio resources are available through measurement using a lower layer of the UE, and accordingly, the UE transmits a measurement report message to an SRNC, which is a control device in the UTRAN. As for the communication protocol to say,

FIG. 2 is a view for explaining that a specific implementation method is not provided in case a plurality of measurement report messages are simultaneously transmitted by various event triggering criteria (for example, event 1x, event 2x, and event 3x).

3 is a schematic diagram of a conventional UMTS system;

4 is a protocol hierarchy diagram of each of the UTRAN and the UE shown in FIG. 3;

5 is a communication protocol diagram for measurement report message transmission according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

3 is a configuration diagram of a UMTS system, which includes a user equipment (UE) 10 as a mobile terminal, a UMTS Terrestrial Radio Access Network (UTRAN) 12 as a UMTS radio access system, and a core network (CN) 14. Doing. The interface between the UE 10 and the UTRAN 14 is defined as a radio interface (Uu), and the interface between the UTRAN 12 and the CN 14 is defined as a CN-UTRAN Interface (Iu). The UTRAN 12 connects the UE 10 and the CN 14 and manages data processing and radio resources. The CN 14 manages a mobile terminal and serves to provide a service desired by the terminal.

As shown in FIG. 4, each of the UTRAN 12 and the UE 10 illustrated in FIG. 3 is a layer 1 (L1) layer 26 and 36, which is a physical layer, and a media access control (MAC) layer. It has a protocol layer including (24,34), RLC (Radio Link Control) layer 22, and RRC (Radio Resource Control) layer 20,30.

Each of the RRC layers 20 and 30 illustrated in FIG. 3 controls radio resource (eg, code, frequency, timeslot, mapping, etc.) allocation to the UE 10 and transmits and receives various signal messages. In addition, each of the RRC layers 20 and 30 arbitrates between a user and a radio bearer layer through the radio resource allocation. In addition, the RRCs 20 and 30 check which radio resources are available through a measurement using UE-1 26, which is a physical layer. To do this, measurement reporting from the UE-RRC layer 20 to the SRNC-RRC 30 in the UTRAN 12 is required. 4 illustrates this diagrammatically. In addition, reporting of local control and local measurement of each of the UE-RRC layer 20 and the SRNC-RRC 30 may be performed in each of the RRCs 20 and 30 and sublayers thereof. It is controlled by control service access points (SAPs) between 24, 26 and 34 and 36.

According to an exemplary embodiment of the present invention, for the event related to handover, the UE 10 simultaneously transmits a plurality of measurement report messages to the SRNC-RRC 30 in the UTRAN 12 within a predetermined period of time set by event triggering criteria. ), Process the reporting process efficiently by setting the priority to transmit according to quality and importance, and the waiting time when sending the measurement report message, and between the mobile terminal and the wireless access system. This reduces the excessive signaling load that can occur.

As mentioned in the previous section [Technical Field to which the Invention belongs and Prior Art in the Field], a measurement type that is related to handover and becomes an event triggering criterion is an intra-frequency measurement. There is a measurement type, an inter-frequency measurement type, and an inter-RAT (inter-radio access technology) measurement type. The intra-frequency measurement type is a measurement type related to handover between adjacent cells of the same frequency, and the inter-frequency measurement type is a measurement type related to handover between adjacent cells and other frequencies. The inter-RAT type is a measurement type related to handover between different radio access standards (GSM, CDMA2000, UMTS, etc.). The intra-frequency measurement type includes events consisting of event 1x (x is a, b, c, d, ...), and the inter-frequency measurement type includes event 2x (x is There are events consisting of a, b, c, d, ...). The inter-RAT measurement type includes events consisting of event 3x (where x is a, b, c, d, ...). The events of event 1x, 2x, and 3x are related to handover and total up to 16.

According to an exemplary embodiment of the present invention, an event related to intra-frequency measurement, inter-frequency measurement, and inter-RAT measurement (inter-RAT (Radio Access Technology) measurement) may be preset within a predetermined period. In the case of triggering at the same time, the UE-RRC 20 determines, based on Table 1, which measurement type to report first. Table 1 is a table showing the priority of each measurement type set according to a preferred embodiment of the present invention, and is mapped to a memory unit of the UE 10.

Reference) A, B, C: Equations A, B, and C to set the priority

Y: satisfies the formula

N: does not satisfy the formula

here,

* Q _Used : Measured quality of the current frequency

* T _{Used 2b} : Absolute reference value applied to the frequency currently used and applied to event 2b.

* H _2b : hysteresis value for event 2b

* Q _{Non used} : Quality measured at the frequency not currently used

* T _{Non used 2b} : Absolute reference value applied to unused frequencies, which is given in event 2b.

*CIO _{Other RAT} : A power offset value unique to each cell, that is, a cell individual offset (CIO) value

* T _Used : Absolute reference value applied to the frequency currently used and applied to event 3a.

* H _3a : Hysteresis value for event 3a

* M _{Other RAT} : Value measured by other system

* T _{Other RAT} : Absolute reference value applied to other systems, which is given in event 3a.

The priority for each measurement type for the six cases shown in Table 1 is set to be high for an event with a large measurand and an event with a measurable amount that greatly affects handover. In other words, Equations A, B, and C used to determine the priority of each measurement type are related to the criteria for handover quality and importance.

When the measurement report criteria are met, the UE-RRC 20 first transmits a MEASUREMENT REPORT message regarding the event of the highest priority measurement type set in Table 1, and then sends the remaining MEASUREMENT REPORT message to the remaining measurement report messages. Are transmitted in order based on the priority at regular time intervals. The time t is determined as follows.

Time to wait for the next transfer (t)

t = min ( Time to trigger event 1a, event 1b, ..., event 2a, event 2b, .. event 3a, 3b ... )

The reason for the time (t) to wait for the next transmission is to allow the SRNC-RRC 30 to process the measurement report message transmitted first by the UE-RRC 20 and to allow the SR to be processed according to the processing result. This is to prevent subsequent measurement report messages from being transmitted by the UE-RRC 20 when it is considered unnecessary to transmit the measurement report message. And the time t waiting for the next transmission is made the minimum of the time of the trigger event values in order to minimize the effect because the mobile terminal having an arbitrary delay time may affect the system.

5 is a communication protocol diagram for transmitting a measurement report message according to an embodiment of the present invention, and assumes the first case of Table 1 above. That is, the priority is the event event 3x of inter-RAT measurement type (x is a, b, c, d, ...) and the event event 2x of inter-frequency measurement type (x is a, b, c, d, ...), and event of event type 1x (x is a, b, c, d, ...) of intra-frequency measurement type. .

Referring to Figure 5 will be described in more detail the measurement report message transmission operation according to an embodiment of the present invention. In step 200 of FIG. 5, the SRNC-RRC 30 transmits a “MEASUREMENT CONTROL” message to the UE-RRC 20 so that the mobile station 10 can perform radio resource measurement. In response to this, the UE-RRC 20 transmits a "CPHY_Measurement-REQ" message that the UE-L1 26 requests to measure a radio resource to the physical layer (UE-L1) 26 of the UE in step 202 of FIG. 5. do. The UE-L1 26 periodically measures radio resources (steps 204 and 208 of FIG. 5) in response to receiving the "CPHY_Measurement-REQ" message, and transmits a "CPHY_Measurement-IND" message containing the measurement result to the UE-L1 26. Transmission to the RRC 20 (steps 206 and 210 of FIG. 5). Accordingly, whenever the "CPHY_Measurement-IND" message is received, the UE-RRC 20 checks whether the measurement result contained in the "CPHY_Measurement-IND" message fulfills the reporting criteria. If the plurality of measurement results simultaneously meet the reporting criteria within a predetermined period of time set by the event triggering criteria as shown in step 212 of FIG. 5, the UE-RRC 20 is determined by the measurement type set in Table 1 First, based on the priority, as shown in step 214 of FIG. 5, the message “MEASUREMENT REPORT” regarding the event event 3x having the highest inter-RAT measurement type is transmitted to the SRNC-RRC 30. . Thereafter, after the determined time delay t, the UE-RRC 20 performs an event event 2x (x is a, of a next-highest inter-frequency measurement type as shown in step 216 of FIG. 5). b, c, d, ...) is sent to the SRNC-RRC 30. " MEASUREMENT REPORT " Then, after the determined time delay t, the UE-RRC 20 performs the event event 1x (x is a, b,) of the lowest-priority intra-frequency measurement type as shown in step 218 of FIG. 5. c, d, ...) is sent to the SRNC-RRC 30. " MEASUREMENT REPORT "

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

As described above, the present invention enables efficient transmission by prioritizing the transmission of a measurement report message for an event having a large measurement amount first. In addition, by reporting a measurement amount that greatly affects the handover, it is possible to reduce unnecessary measurement report message transmission, thereby reducing the signaling load between the UE and the UTRAN.

Claims (8)

A method for transmitting a measurement report message in an asynchronous mobile communication system, Setting priorities for each type of measurement based on the quality and importance of handover for events related to handover by the mobile terminal; Determining whether a plurality of events related to handover are triggered together within a preset period and the plurality of measurement results related to handover satisfy a reporting criterion; As the plurality of measurement results related to handover satisfy the reporting criteria, the mobile station sequentially transmits the measurement report messages according to the set priority of the measurement type to the radio access system. Way. The method of claim 1, wherein the handover related measurement type includes an intra-frequency measurement, an inter-frequency measurement, and an inter-RAT measurement. Method for sending measurement report messages. The method of claim 2, wherein the priority of each measurement type is determined using Equations A, B, and C below. here, * Q _Used : Measured quality of the current frequency * T _{Used 2b} : Absolute reference value applied to the frequency currently used and applied to event 2b. * H _2b : hysteresis value for event 2b * Q _{Non used} : Quality measured at the frequency not currently used * T _{Non used 2b} : Absolute reference value applied to unused frequencies, which is given in event2b. *CIO _{Other RAT} : A power offset value unique to each cell, that is, a cell individual offset (CIO) value * T _Used : Absolute reference value applied to the frequency currently used and applied to event 3a. * H _3a : Hysteresis value for event 3a * M _{Other RAT} : Value measured by other system * T _{Other RAT} : Absolute reference value applied to other systems, which is given in event 3a. 4. The method of claim 3, wherein the priority of each measurement type is set based on the following table. Here, A, B, C: the formula A, B, C for determining the priority Y: satisfies the formula N: does not satisfy the formula A method for transmitting a measurement report message in an asynchronous mobile communication system, Intra-frequency measurement, inter-frequency measurement, and inter-RAT measurement based on handover related quality and importance for events related to handover by the mobile terminal (inter-RAT (Radio) Access Technology) process of setting the priority for each measurement type consisting of measurement), Determining whether a plurality of events related to handover are triggered together within a preset period and the plurality of measurement results related to handover satisfy a reporting criterion; If the plurality of handover-related measurement results satisfy a reporting criterion, checking priorities of the set measurement types according to whether handover-related quality and importance conditions of the plurality of handover-related measurement results are satisfied; Based on the checked priority of each measurement type, the mobile station transmits a measurement report message of each of the plurality of events related to the handover to the wireless access system for each measurement type in sequence. Way for you. The method according to claim 5, wherein, in the process of sequentially transmitting the measurement report message to the radio access system for each measurement type, the measurement report message of the highest priority measurement type is transmitted first, and then the other measurement report messages. For the method for transmitting a measurement report message, characterized in that for transmitting at a predetermined time interval in order based on the priority. 7. The method of claim 6, wherein the predetermined time interval is a time waiting for a next transmission, and is determined as a minimum value of time of trigger event values. The method according to claim 5 or 6, wherein the satisfaction of the handover-related quality and importance conditions for the plurality of measurement results related to the handover is determined based on Equations A, B, and C below. Method for sending measurement report message. here, * Q _Used : Measured quality of the current frequency * T _{Used 2b} : Absolute reference value applied to the frequency currently used and applied to event 2b. * H _2b : hysteresis value for event 2b * Q _{Non used} : Quality measured at the frequency not currently used * T _{Non used 2b} : Absolute reference value applied to unused frequencies, which is given in event 2b. *CIO _{Other RAT} : A power offset value unique to each cell, that is, a cell individual offset (CIO) value * T _Used : Absolute reference value applied to the frequency currently used and applied to event 3a. * H _3a : Hysteresis value for event 3a * M _{Other RAT} : Value measured by other system * T _{Other RAT} : Absolute reference value applied to other systems, which is given in event 3a.