KR100604545B1 - Hybrid mobile communication terminal and method for controlling communication system acquisition - Google Patents

Abstract

The present invention relates to a mobile communication terminal, and more particularly, to a technology related to a hybrid terminal supporting both a voice service and a high speed packet data service.

A method of controlling a communication system acquisition of a mobile communication terminal according to the present invention includes the steps of: a) acquiring a 1x system supporting a voice service and a low speed data service; b) attempting to acquire an EVDO system that supports high speed data communication after 1x system acquisition; c) if the EVDO system acquisition according to step b) fails, matching the failure information with information obtained according to the 1x system acquisition and storing in the database; d) after the 1x system acquisition, if the information obtained according to the 1x system acquisition is stored in the database before the EVDO system acquisition, blocking the EVDO system acquisition attempt; characterized in that it comprises a.

Hybrid terminal, 1x system, EVDO system, system identifier (SID)

Description

Hybrid mobile communication terminal and method for controlling communication system acquisition

1 is a diagram schematically illustrating a mobile communication network configuration supporting conventional data communication.

2 is a flowchart illustrating a communication system acquisition control method in a conventional hybrid mobile communication terminal.

Figure 3 is a block diagram schematically showing the configuration of a hybrid mobile communication terminal according to a preferred embodiment of the present invention.

4 is a flowchart illustrating a communication system acquisition control method of a hybrid mobile communication terminal according to a preferred embodiment of the present invention.

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

100: keypad 200: display unit

300: wireless communication unit 400: voice input and output circuit

500: memory 510: database

600: control unit 610: voice communication unit

620: first communication acquisition unit 630: second communication acquisition unit

640: second communication acquisition condition processing unit 650: second communication acquisition control unit

660: second communication acquisition condition deletion processing unit

The present invention relates to a mobile communication terminal, and more particularly, to a technology related to a hybrid terminal supporting both a voice service and a high speed packet data service.

Code Division Multiple Access (CDMA) 2000 1x service (hereinafter referred to as '1x only' service) uses the IS-95C network, which has evolved from the existing IS-95A and IS-95B networks. It is a service that enables wireless Internet speeds up to 144Kbps faster than 56 Kbps. Meanwhile, the 3rd Generation Partership Projects (3GPP2), an international standardization organization for CDMA systems, is based on Qualcomm's High Data Rate (HDR) as a method for high-speed packet transmission. "CDMA 2000 1x Evolution Data Only ) "And has been confirmed as an international standard (hereinafter referred to as" EVDO "). This EVDO method is an evolving method that transmits only data in the 1x dedicated communication standard, and provides bidirectional high speed data service having a transmission speed of up to 2.4Mbps for packet networks only.

EVDO's IS-856 is a dedicated protocol for packet data transmission that is different from the 1x dedicated IS-2000 wireless protocol. It requires a base station device (channel card) separate from the 1x base station device. Elements are commonly used. FIG. 1 schematically illustrates such a mobile communication network configuration, and for reference, FIG. 1 illustrates a 1x EVDO separate network scheme. Referring to FIG. 1, it can be seen that an IS-2000 base station system supporting 1x and a 1xEV base station system supporting EVDO are constructed together. This is because the physical layer of the EVDO IS-856 is different from the 1x physical layer. Currently, EVDO service is started by adding equipment supporting EVDO to existing 1x dedicated system. In terms of base station, high frequency (RF: Radio Frequency) is shared with existing 1x dedicated system equipment and is a digital device. This is possible because EVDO can be serviced by adding only a card.

Hybrid access terminal is a mobile communication terminal that can use both communication service provided by EVDO system and 1x dedicated system. The hybrid terminal receives an overhead message on a paging channel, which is a control channel of the 1x system, performs a 1x system acquisition when the power is turned on by the user, and then pilots the EVDO system. By searching for a pilot channel and acquiring a pilot signal, the EVDO system is acquired to perform slot mode operation for both the 1x system and the EVDO system, and the hybrid terminal is said to be in a hybrid operation mode.

In the hybrid operation mode, the hybrid terminal transitions to IS-2000 connection mode while establishing a call with 1x system when a call is to be received or originated. Since the connection mode is set to EVDO prefer, the EVDO packet call is set to transition to the IS-856 connection mode.

2 is a flowchart illustrating a system acquisition method in a conventional hybrid terminal. As shown, when the hybrid terminal is powered on by the user, the hybrid terminal sequentially searches for channels indicated by the Preferred Roaming List (PRL) and attempts to acquire the system, first attempting to acquire 1x system (step S201). (Step S203). When the 1x system is acquired, an EVDO system acquisition is attempted while searching for EVDO channels indicating priority in the PRL for a predetermined time (step S205) (step S207). If the EVDO system is acquired, the hybrid terminal operates in a hybrid mode, and if the EVDO system is not obtained, the hybrid terminal operates in an idle state only in conjunction with the 1x system (step S209) (step S211). (Step S213).

If the EV terminal is powered on in an area where the EVDO service is not supported, the hybrid terminal performs an unnecessary process for acquiring the EVDO system for a predetermined time after the 1x system acquisition. In addition, especially in the case of a weak electric field (system lost), the hybrid terminal performs another unnecessary process for acquiring the EVDO system for a predetermined time after the 1x system acquisition. In addition, when the hybrid terminal fails to acquire the EVDO system at initialization, as shown in FIG. 2, the PRL is periodically rescanned in a 1x dedicated operation mode (for example, every 2 or 3 minutes) to prioritize the priority. As a result, attempts to acquire EVDO systems are performed by searching for EVDO channels.

As such, the hybrid terminal attempts to acquire an EVDO system that is periodically performed during a rescan due to failure of acquiring an EVDO system at the time of initial initialization in a region where the EVDO service is not supported, and a system lost easily in a weak electric field. Since the process itself means that the system cannot be stably acquired, it causes a problem that the 1x voice call service such as call origination or call reception cannot be stably provided.

The present invention has been made to solve such a problem, and an object of the present invention is to prevent the provision of an unstable voice call service due to an unnecessary attempt to acquire an EVDO system in a hybrid terminal.

Hybrid mobile communication terminal according to an aspect of the present invention for achieving the above object stores the EVDO system acquisition failure information for the communication service zone (zone) when the EVDO system acquisition fails after the 1x system acquisition, Thereafter, before the EVDO system acquisition attempt, it is determined whether the communication service area is a region stored as EVDO system acquisition failure information, and if the EVDO system acquisition failure information is stored, the EVDO system acquisition attempt is not performed.

According to this aspect of the present invention, the hybrid mobile communication terminal according to the present invention does not perform an unnecessary EVDO system acquisition attempt in an area that does not support the EVDO service. As a result, it is possible to fundamentally block repeated attempts to acquire the EVDO system, thereby solving the problem of stably providing 1x voice call services such as call origination or call arrival.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

2 is a block diagram schematically showing the configuration of a mobile communication terminal according to a preferred embodiment of the present invention. As shown, the mobile communication terminal basically includes a keypad 100, a display unit 200 for displaying a menu and an operation state, and a wireless communication unit 300 for extracting voice and data signals from a radio signal transmitted and received through an antenna. And a voice input / output circuit 400 for inputting and outputting a voice call signal from the wireless communication unit 300 through a microphone and a speaker, and a memory 500 for storing control program data for overall control of the operation of the mobile communication terminal. And a configuration of a typical mobile communication terminal such as a control unit 600 for controlling the entire system.

First, the keypad 100 and the display unit 200 which is a liquid crystal display device may have a conventional well-known configuration. The memory 500 is divided into a ROM region in which control program data for controlling an operation of a terminal is stored, and a RAM region in which data generated during a terminal control operation are temporarily stored. The memory 500 also includes a database 510 according to the present invention, which will be described later. The wireless communication unit 300 is configured to include an antenna and RF circuit for cellular communication with the base station. The voice input / output circuit 400 is a well-known configuration that processes digital voice data into an analog voice signal or vice versa, and includes an additional circuit such as an audio amplification circuit or a filter.

The baseband circuit of the wireless communication unit 300 and most of the circuits of the control unit 600 are commercially provided as a single integrated circuit. This integrated circuit, commonly referred to as an MSM chip, includes internally dedicated hardware for processing communications, a digital signal processor and a general purpose microprocessor. Each part constituting the control unit 600 may be configured by dedicated hardware or software or a mixture thereof.

The control unit 600 basically includes a voice communication unit 610 for processing a voice call. In the hybrid mobile communication terminal, the control unit 600 basically acquires and processes a first communication system supporting a voice service and a low speed data service, and a second communication system supporting high speed data communication. And a second communication acquiring unit for acquiring processing. In one embodiment, the first communication system is a Code Division Multiple Access (CDMA) 2000 1x service system (hereinafter referred to as an '1x system'), and the second communication system is a CDMA 2000 1x Evolution Data Only (EVDO) service system ( Hereinafter referred to as an 'EVDO system'.

First, if the hybrid mobile communication terminal according to the present invention has never been powered on and obtained a system for communication, no information is stored in the database 510. As described below, the database 510 stores information for determining whether to perform an EVDO system acquisition attempt before the second communication acquisition unit 630 attempts to acquire an EVDO system.

According to a characteristic aspect of the present disclosure, the controller 600 includes a second communication acquisition condition processor 640 and a second communication acquisition controller 650. When the hybrid terminal is first powered on for user key manipulation, the first communication acquisition unit 620 sequentially searches for channels indicated by a Preferred Roaming List (PRL) to acquire a 1x system by attempting to acquire a 1x system as is well known. do. As is well known, when the 1x system is acquired by the first communication acquisition unit 620, the second communication acquisition unit 630 sequentially searches for channels indicated by a Preferred Roaming List (PRL) and attempts to acquire an EVDO system. Acquire an EVDO system.

The first communication acquisition unit 620 receives an overhead message transmitted from a base station to a paging channel during a 1x system acquisition process. The overhead message includes a system identifier (SID: System Identifier). Is included. The SID is an identifier for identifying a zone (zone (referred to as a cell)) that the base station is in charge of, and is used by the second communication acquisition condition processing unit 640 and the second communication acquisition control unit 650 to be described later. .

When the second communication acquisition condition processor 640 fails to acquire the EVDO system according to the EVDO system acquisition attempt after the 1x system acquisition, the second communication acquisition condition processor 640 matches the SID obtained according to the 1x system acquisition with the EVDO system acquisition failure information and stores it in the database 510. Process. Accordingly, the database 510 has information that EVDO service is not available in the region of the SID.

The second communication acquisition control unit 650 controls the second communication acquisition unit 630. If the SID obtained according to the 1x system acquisition after the 1x system is acquired is stored in the database 510, in the region The second communication acquisition unit 630 serves to block the EVDO system acquisition attempt. In this case, the hybrid mobile communication terminal immediately operates in the 1x dedicated operation mode.

Since the database 510 is in a null state when the hybrid mobile communication terminal according to the present invention is powered on for the first time, the second communication acquisition unit 630 acquires the EVDO system after the 1x system is acquired. Will attempt to do so. If the current location is not available for EVDO service, the second communication acquisition unit 630 fails to acquire the EVDO system, and accordingly, the second communication acquisition condition processing unit 640 stores the SID obtained according to the 1x system acquisition. Save to 510.

After the terminal is powered on and initialized, if the system is lost in the power-on state (system lost), the database before the repeated EVDO system acquisition attempts due to the failure to acquire the EVDO system in the 1x dedicated operation mode in which the EVDO system is not acquired. If the SID according to the current 1x system acquisition is stored at 510, the second communication acquisition control unit 650 blocks the second communication acquisition unit 630 from performing an acquisition attempt of the EVDO system.

If the SID according to the 1x system acquisition in the current region is not stored in the database 510 before the EVDO system acquisition attempt, the second communication acquisition unit 630 performs the EVDO system acquisition attempt. If the second communication acquisition unit 630 does not acquire the EVDO system, the second communication acquisition condition processing unit 640 newly stores the SID according to the current 1x system acquisition in the database 510.

According to this aspect of the present invention, the hybrid mobile communication terminal according to the present invention does not perform an unnecessary EVDO system acquisition attempt in an area that does not support the EVDO service. It is possible to fundamentally block repeated attempts to acquire EVDO systems, thereby solving the problem of stably providing 1x voice call services such as call origination or call arrival.

According to an additional aspect of the present invention, the second communication acquisition control unit 650 stores the SID obtained according to the 1x system acquisition in the current region in the database 510, but periodically after a predetermined time (for example, after the SID is stored). , Before a week), the second communication acquisition unit 630 blocks the EVDO system from attempting to acquire. This is to consider that a new EVDO service may be provided in the region, so that the EVDO system can be caught when the EVDO service is implemented.

Accordingly, after a predetermined time elapses from the second communication acquisition condition processing unit 640 storing the specific SID in the database 510, the second communication acquisition unit 630 performs the corresponding zone of the SID. Attempts to acquire the EVDO system. If the system is newly configured to provide the EVDO service in the zone, the second communication acquisition unit 630 may acquire the EVDO system.

According to an additional aspect of the present invention, the control unit 600 further includes a second communication acquisition condition deletion processing unit 660. The second communication acquisition unit 630 acquires the EVDO system in the region of the SID after a predetermined time elapses after the second communication acquisition condition processing unit 640 stores the specific SID in the database 510. When an attempt is made to acquire the EVDO system, the second communication acquisition condition deletion processing unit 660 deletes the corresponding SID stored in the database 510.

4 is a flowchart illustrating a communication system acquisition control method of a hybrid mobile communication terminal according to a preferred embodiment of the present invention. Hereinafter, a communication system acquisition control method of a hybrid mobile communication terminal according to an embodiment of the present invention will be described with reference to FIG. 4.

When the power is turned on by the user key operation, the control unit 600 acquires the 1x system by performing the 1x system acquisition attempt as is well known (step S401) (step S403) (step S405). Next, the controller 600 determines whether the EVDO service is unavailable by checking whether the system identifier (SID) obtained according to the 1x system acquisition is stored in the database 510 (step S407). If the corresponding SID is stored in the database 510, the controller 600 determines that the EVDO service is unavailable and operates in the 1x dedicated operation mode and monitors the paging channel during its slot period. In this case, when the hybrid mobile communication terminal moves to another region, that is, another region, the SID received from the base station is changed accordingly.

If the SID is not stored in the database 510 as a result of the determination in step S407, the controller 600 attempts to acquire the EVDO system (step S409). Upon acquiring the EVDO system according to the EVDO system acquisition attempt, the hybrid mobile communication terminal operates in the hybrid operation mode (step S411) (step S420). If the EVDO system cannot be obtained, the controller 600 stores the SID obtained by acquiring the 1x system in the region in the database 510 to divide the region into an EVDO unserviceable region.

If the EVDO system is not acquired, the control unit 600 periodically (for example, two or three minutes) before the attempt to acquire the EVDO system (step S409), the SID obtained by acquiring the 1x system in the current region is stored in the database 510. Check whether it is stored in step S407). In addition, of course, in the case of system loss, step S407 is performed before step S409.

Although not shown in FIG. 4 according to a preferred embodiment, when the control unit 600 is No when performing step S407, the controller 600 checks whether a predetermined time elapses since the SID is stored in the database 510. Then, step S409 is performed only after a predetermined time elapses. This is because, as described above, the EVDO service was not provided in the region before, but the EVDO service may be provided later. Preferably, when the control unit 600 acquires the EVDO system by performing step S409 after a predetermined time elapses, the control unit 600 deletes the corresponding SID from the database 510 as described above.

As described above, the hybrid mobile communication terminal according to the present invention does not perform an unnecessary EVDO system acquisition attempt in an area that does not support the EVDO service. In particular, as described above, an EVDO which is periodically repeated due to the failure of EVDO system acquisition when the terminal is initialized. It is possible to fundamentally block the system acquisition attempt, thereby solving the problem of stably providing 1x voice call services such as call origination or call arrival.

On the other hand, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (9)

a) obtaining a 1x system supporting voice services and low speed data services; b) attempting to acquire an EVDO system that supports high speed data communication after 1x system acquisition; c) if the EVDO system acquisition according to step b) fails, matching the failure information with information obtained according to the 1x system acquisition and storing in the database; d) blocking the EVDO system acquisition attempt if the information obtained according to the 1x system acquisition is stored in the database after the 1x system acquisition and before the EVDO system acquisition; Communication system acquisition control method of a hybrid mobile communication terminal comprising a. The method of claim 1, wherein the information obtained according to the 1x system acquisition is a system identifier (SID). The process of claim 1 or 2, wherein step d) comprises: The information obtained according to the 1x system acquisition is stored in the database, but the communication system acquisition control method of the hybrid mobile communication terminal, characterized in that it blocks the EVDO system acquisition attempt only before the predetermined time elapses after the storage. The method of claim 3 wherein the method is: e) deleting the corresponding SID stored in the database when an EVDO system acquisition attempt is performed to acquire an EVDO system after the predetermined time elapses; Communication system acquisition control method of a hybrid mobile communication terminal further comprising. A database; A first communication acquiring unit for performing a first communication system acquiring process for supporting a voice service and a low speed data service; A second communication acquiring unit for performing a second communication system acquiring process for supporting high-speed data communication after acquiring the first communication system by the second communication acquiring unit; If the second communication acquisition unit fails to acquire the second communication system, the second communication acquisition condition processing unit matching the failure information with the information obtained according to the first communication system acquisition of the first communication acquisition unit and storing the failure information in the database. Wow; A second communication acquiring control unit for controlling to block the second communication system acquiring process of the second communication acquiring unit if the information obtained by acquiring the first communication system in the current region is stored in the database; Hybrid mobile communication terminal comprising a. The method of claim 5, wherein the second communication acquisition control unit: Hybrid information characterized in that the information obtained by acquiring the first communication system is stored in the database, and the second communication system acquires the second communication system acquiring process only after a predetermined time elapses after the storing. Communication terminal. The mobile terminal of claim 6, wherein the mobile communication terminal comprises: Information obtained by the first communication acquisition unit acquiring the first communication system in the current region is stored in the database, and after the predetermined time elapses after the storage, the second communication acquisition unit performs the second communication system acquisition process. A second communication acquisition condition deletion processing unit which deletes the corresponding information stored in the database according to the acquisition of the second communication system; Hybrid mobile communication terminal further comprises. 8. A hybrid mobile terminal according to any one of claims 5 to 7, wherein the first communication system is a CDMA 2000 1x system and the second communication system is a CDMA 2000 1x EVDO system. The hybrid mobile communication terminal of claim 8, wherein the information obtained according to the first communication system acquisition is a system identifier (SID).

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