JP5449051B2 - Wireless communication system, wireless terminal device, base station, and control method - Google Patents

Wireless communication system, wireless terminal device, base station, and control method Download PDF

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JP5449051B2
JP5449051B2 JP2010140149A JP2010140149A JP5449051B2 JP 5449051 B2 JP5449051 B2 JP 5449051B2 JP 2010140149 A JP2010140149 A JP 2010140149A JP 2010140149 A JP2010140149 A JP 2010140149A JP 5449051 B2 JP5449051 B2 JP 5449051B2
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base station
communication
terminal device
wireless terminal
communication system
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JP2012005007A (en
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純一 古海
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京セラ株式会社
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Description

  The present invention relates to a radio communication system, a radio terminal apparatus, a base station, and a control method for controlling radio resources.

  2. Description of the Related Art Conventionally, a small base that realizes a femto cell having a narrower area (for example, up to a radius of several tens of meters) as a base station with which a mobile phone registers its location than a base station such as a normal macro cell or micro cell The station is being used. The communication system using the femtocell is a system in which a plurality of small base stations are installed and voice or data communication is performed using a broadband line or the like as a countermeasure for dead zones of radio waves in high-rise apartments, shopping centers, and the like.

  Here, for example, in the macro cell communication area, if the number of mobile phones in communication increases, the communication speed decreases. Therefore, in order to provide a high-speed data communication service, the upper limit of the number of mobile phones per base station ( In some cases, a femtocell with a few) is installed. In such a femtocell base station, when the number of mobile phones registered for location reaches the upper limit of the number of mobile phones, the location registration of further mobile phones is rejected and redirected to another base station.

  In addition, some femtocells reject base stations other than specific mobile phones. This base station maintains a list for identifying mobile phones that can be connected, and rejects this connection when there is an access from a mobile phone that is not registered in this list (see, for example, Patent Document 1).

JP 2009-510969 A

  However, in the above-described technique, the location registration is restricted even when the location-registered mobile phone is not actually communicating and there is a margin in radio resources (for example, a traffic channel in the CDMA system). . If there is a margin in radio resources, high-speed communication can be maintained, and if communication is not performed only by location registration, radio resources are not used, and thus excessive restrictions have been made.

  An object of this invention is to provide the radio | wireless communications system, radio | wireless terminal apparatus, base station, and control method which can use a radio | wireless resource efficiently.

Wireless communication system according to the present invention, possess a first communication method or a second communication mode wireless terminal capable of using the communication unit and a first base station and a second base station, said first base station, a determination section for determining whether or not usage of non-linear resource reaches the top limit, the usage of the radio resources is determined to have reached the upper limit by the determination unit, a new communication request includes but a notification unit that performs a notification for connecting a wireless terminal device that we row to another base station, wherein the radio terminal apparatus, when starting the communication by the second communication method, the first When the usage state of the radio resource in the base station of the second base station reaches the upper limit, the connection destination of the second communication scheme is changed from the first base station to the second base station, and the first communication scheme And a control unit for maintaining a connection destination in the first base station .

Before SL first base station may it base station der constituting the short range cell.

Before SL first base station may configure the femtocell.

Before Symbol notification unit may I rows notified by the the attached broadcast messages to the wireless terminal.

Before SL control unit, when communication by the second communication method is completed, the connection destination for the second communication method may be changed from the second base station to the first base station.

The first communication method is a CDMA2000_1x method, the second communication method is a CDMA2000_1x_EVDO method, and the control unit determines a connection destination for the second communication method by using an association tag function. May be changed to the first base station.

The wireless terminal device according to the present invention is capable of communication by the first communication method or the second communication method, and when starting communication by the second communication method, the wireless terminal device of the first base station When the usage status has reached a predetermined upper limit, the connection destination for the second communication method is changed from the first base station to the second base station, and the connection destination for the first communication method is changed to the first communication station. A control unit maintained by one base station.

A control method according to the present invention is a control method for a communication system having a wireless terminal device capable of communicating according to a first communication method or a second communication method, a first base station, and a second base station. When the wireless terminal device starts communication, if the use state of the radio resource in the first base station has reached the upper limit, the connection destination for the second communication method is voluntarily selected. A control step of changing from the base station to the second base station and maintaining the connection destination in the first base station for the first communication method.

A wireless communication system according to the present invention includes a wireless terminal device, a first base station, and a second base station, and the wireless terminal device is connected to the first base station, and When receiving a notification from the first base station that the usage status of the radio resource has reached the upper limit, when starting communication, the connection destination base station does not transmit a communication request to the first base station. Is changed from the first base station to the second base station.

The radio terminal apparatus according to the present invention is connectable to the first base station or the second base station, and in a state where the radio terminal apparatus is connected to the first base station, radio resources are transmitted from the first base station. After receiving a notification that the usage status has reached the upper limit, when starting communication, the base station of the connection destination is sent from the first base station without transmitting a communication request to the first base station. Change to the second base station.

  According to the present invention, it is possible to efficiently use radio resources in a radio communication system.

It is a figure which shows the whole structure of the radio | wireless communications system which concerns on embodiment of this invention. 1 is an external perspective view of a mobile phone according to an embodiment of the present invention. It is a block diagram which shows the function of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the restriction | limiting of the position registration to the femtocell which concerns on embodiment of this invention. It is a figure which shows operation | movement when the radio | wireless resource of the femtocell which concerns on embodiment of this invention has reached the upper limit. It is a figure which shows operation | movement when the radio | wireless resource of the femtocell which concerns on embodiment of this invention has not reached the upper limit. It is a figure which shows the operation | movement at the time of data communication in the mobile telephone which concerns on embodiment of this invention. It is a figure which shows the flow of a process, and state transition when there exists a packet in radio | wireless resource in the femto base station which concerns on embodiment of this invention, and there exists a packet transmission from a mobile telephone. It is a figure which shows the flow of a process, and state transition when there exists packet transmission from a mobile telephone, when there is no vacancy in a radio | wireless resource in the femto base station which concerns on this embodiment of this invention.

  Hereinafter, an example of an embodiment of the present invention will be described. In the present embodiment, a mobile phone 1 will be described as an example of a wireless terminal device.

FIG. 1 is a diagram illustrating an overall configuration of a wireless communication system 100 according to the present embodiment.
The mobile phone 1 is a wireless terminal device that can communicate with base stations that constitute various cells (for example, femtocell A and macrocell B). The mobile phone 1 performs time and code synchronization with a base station that obtains a predetermined or higher electric field strength, and then performs location registration of the terminal itself. The telephone 1 is a communication target. The femto cell is an example of a narrow cell, and the macro cell is an example of a wide cell.

  The femto base station 101 (first base station) constituting the femtocell A is operated and managed by the management server 310 via the IP network (Internet) 400, and the management server 310 is connected to the network 300 of the communication carrier. Has been. In addition, a macro base station 102 (second base station) that constitutes a non-femto cell (hereinafter described as macro cell B) is connected to a network 300 of a communication carrier.

  The femto base station 101 and the macro base station 102 have two communication schemes, for example, CDMA2000_1x (first communication scheme, hereinafter referred to as 1x) and CDMA2000_1x_EVDO (second communication scheme, hereinafter referred to as EVDO). It is assumed that the mobile phone 1 is a hybrid terminal that supports both communication methods.

  By the way, as an example of delivering broadcast messages all at once to the mobile phone 1 in the communication area of the base station, there is a service called BCSMS (Broadcast Short Messaging Services). BCSMS is a service for transmitting a message with a limited capacity (for example, 140 bytes) to an unspecified number of mobile phones 1 existing in a communication area using a protocol called a short message service. This BCSMS is provided in the same manner regardless of whether it is a femtocell or a non-femtocell (macrocell, microcell, or picocell), and is used, for example, for distribution of news bulletins, emergency earthquake bulletins, and the like.

  In this embodiment, the femto base station 101 notifies the femtocell A of a broadcast message described later by BCSMS. The mobile phone 1 whose location is registered in the femto base station 101 can receive this broadcast message in the femtocell A.

FIG. 2 is an external perspective view of the mobile phone 1 according to the present embodiment.
The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 includes an operation unit 11 on the front surface unit 10 and a microphone 12 to which a voice uttered by a user of the mobile phone 1 during a call or when using a voice recognition application is input. The The operation unit 11 includes a function setting operation button 13 for activating various functions such as various setting functions, a telephone book function, and a mail function, and an input operation button 14 for inputting numbers of telephone numbers, mail characters, and the like. , And a determination operation button 15 for performing determination and scrolling in various operations.

  The display unit side body 3 includes a display unit 21 for displaying various types of information on the surface unit 20 and a receiver 22 for outputting the voice of the other party of the call.

  Further, the upper end portion of the operation unit side body 2 and the lower end portion of the display unit side body 3 are connected via a hinge mechanism 4. In addition, the mobile phone 1 relatively rotates the operation unit side body 2 and the display unit side body 3 which are connected via the hinge mechanism 4, so that the operation unit side body 2 and the display unit side body 3 are rotated. The body 3 can be in an open state (open state), or the operation unit side body 2 and the display unit side body 3 can be folded (folded state).

FIG. 3 is a block diagram illustrating functions of the wireless communication system 100 according to the present embodiment.
The mobile phone 1 includes an operation unit 11, a display unit 21, a control unit 30, a 1x communication unit 40, an EVDO communication unit 41, a storage unit 50, and a voice control unit 60. In addition, the femto base station 101 includes a control unit 130, a 1x communication unit 140, an EVDO communication unit 141, and a storage unit 150.

First, the operation of the femto base station 101 will be described.
The control unit 130 controls the entire femto base station 101 and controls the wireless communication connection with the mobile phone 1 via the 1x communication unit 140 or the EVDO communication unit 141. At this time, the control unit 130 controls the storage unit 150 to read various programs and data and write data.

  The 1x communication unit 140 transmits / receives a signal to / from the mobile phone 1 through the antenna according to the 1x protocol under the control of the control unit 130. In addition, the 1x communication unit 140 broadcasts a broadcast message by BCSMS in the communication area. The mobile phone 1 whose location is registered in the femto base station 101 receives this broadcast message in the femtocell A.

  The EVDO communication unit 141 performs signal transmission / reception via the antenna with the mobile phone 1 according to the EVDO protocol, similarly to the 1x communication unit 140, under the control of the control unit 130.

  Here, the control unit 130 accepts location registration from the mobile phone 1 by both 1x and EVDO. At this time, as shown in FIG. 4, the control unit 130 allows the location registration of the mobile phone 1 even when the number of terminals allowed to communicate simultaneously in EVDO is exceeded. As a result, the mobile phone 1 enters a standby state for data transmission / reception in the femtocell A.

  In addition, the control unit 130 includes a determination unit 131 and a notification unit 132, and controls the amount of communication by EVDO in the femtocell A.

  The determination unit 131 monitors the occurrence of EVDO communication in the mobile phone 1 registered in the femto base station 101, and the usage status of the EVDO radio resource (traffic channel) in the femtocell A is a predetermined upper limit ( For example, it is determined whether or not four terminals have established a traffic channel.

  When the determination unit 131 determines that the usage state of the radio resource has reached a predetermined upper limit, the notification unit 132 makes a new communication request because the communication speed decreases when more data communication occurs. Notification for registering the location of the mobile phone 1 to another base station is performed. Specifically, when the radio resource is used up to the upper limit, the notification unit 132 periodically notifies the location-registered mobile phone 1 by a BCSMS broadcast message and receives the message. Encourage transition to other base stations. This notification is continued until there is a free radio resource.

For example, as shown in FIG. 5, in the femtocell A, when the mobile phone 1 performing data communication by EVDO has reached the upper limit (four), the femto base station 101 uses the radio resources of EVDO by BCSMS. You are notified that you cannot.
When the mobile phone 1 receives a call by the BCSMS and makes an incoming / outgoing call using the EVDO, the mobile phone 1 knows that the femtocell A cannot communicate with the cellphone 1 and therefore transitions to the macrocell B to establish communication.

On the other hand, as shown in FIG. 6, in the femtocell A, when the number of mobile phones 1 that are performing data communication by EVDO is less than the upper limit (for example, three), the femto base station 101 does not notify by BCSMS.
The mobile phone 1 establishes communication at the femtocell A because it can be understood that the femtocell A can communicate with the mobile phone 1 when receiving and receiving by EVDO without receiving notification by BCSMS.

Next, the operation of the mobile phone 1 will be described.
The control unit 30 controls the entire mobile phone 1, and performs predetermined control on the display unit 21, the 1x communication unit 40, the EVDO communication unit 41, and the like, for example. In addition, the control unit 30 receives input from the operation unit 11 or the like and executes various processes. And the control part 30 controls the memory | storage part 50 in the case of a process execution, reads various programs and data, and writes data.

The 1x communication unit 40 communicates with an external device (the femto base station 101 or the macro base station 102) using a 1x protocol. Then, the 1x communication unit 40 demodulates the signal received from the antenna, supplies the processed signal to the control unit 30, modulates the signal supplied from the control unit 30, and transmits the signal from the antenna to the external device. Send.
In this embodiment, the 1x communication unit 40 receives a BCSMS broadcast message distributed from the femto base station 101 and provides the BCSMS broadcast message to the control unit 30.

The EVDO communication unit 41 communicates with an external device (the femto base station 101 or the macro base station 102) in the same manner as the 1x communication unit 40 using the EVDO protocol.
In the mobile phone 1, EVDO has priority over 1x in data communication, and voice communication is performed in 1x.

  The storage unit 50 includes, for example, a working memory and is used for arithmetic processing by the control unit 30. In addition, various programs according to the present embodiment are stored. Furthermore, the storage unit 50 stores a PRL (Preferred Roaming List) that is a list of identification information for the mobile phone 1 to capture the frequency channel of the base station.

  The sound control unit 60 performs predetermined sound processing on the signal supplied from the 1x communication unit 40 according to the control of the control unit 30, and outputs the processed signal to the receiver 22. The receiver 22 outputs the signal supplied from the audio control unit 60 to the outside. This signal may be output from a speaker (not shown) instead of the receiver 22 or together with the receiver 22. In addition, the voice control unit 60 processes the signal input from the microphone 12 according to the control of the control unit 30, and outputs the processed signal to the 1x communication unit 40. The 1x communication unit 40 performs predetermined processing on the signal supplied from the audio control unit 60 and outputs the processed signal from the antenna.

Hereinafter, the processing content of the control part 30 is explained in full detail.
First, the control unit 30 registers the location of both the 1x and the EVDO with respect to the femto base station 101 that can perform high-speed data communication, and enters a call waiting state.
FIG. 7 is a diagram illustrating an operation during data communication in the mobile phone 1 according to the present embodiment.

  When starting the data communication by EVDO, the control unit 30 receives a BSSMS notification from the femto base station 101, and the base station (for example, macro When the base station 102) is searched and registered for location, data communication is started.

  Here, the mobile phone 1 can perform location registration for both 1x and EVDO. That is, when changing the EVDO location registration destination from the femto base station 101 to the macro base station 102 at the time of outgoing / incoming EVDO, the control unit 30 continues location registration with the femto base station 101 for 1x.

  At this time, when the communication by EVDO is completed, the control unit 30 registers the position of EVDO with respect to the femto base station 101 whose position is registered for 1x by the Association Tag function of PRL. In the Association Tag function, the control unit 30 operates to acquire the communication system having the same attribute as the communication system whose location is registered by 1x, that is, in this example, the femtocell A is captured by the EVDO.

  FIG. 8 is a diagram illustrating a process flow and state transition when a packet is transmitted from the mobile phone 1 when there is a free radio resource in the femto base station 101 according to the present embodiment. In this case, the mobile phone 1 can communicate by EVDO in the femtocell A.

Before making a call, the mobile phone 1 is registered in the femto base station 101 by both the 1x communication unit 40 and the EVDO communication unit 41, and is in a call waiting state.
At this time, when receiving a packet transmission request from the user, the control unit 30 issues a transmission request to the femto base station 101 via the EVDO communication unit 41 (steps S1 to S2).

  After communication with the femto base station 101 is established (step S3) and packet transmission / reception is performed, upon receiving a packet connection termination request, the control unit 30 transmits the request to the femto base station 101 via the EVDO communication unit 41. A disconnection request is made (steps S4 to S5).

  When the communication is disconnected (step S6), the EVDO communication unit 41 becomes the waiting information for outgoing / incoming calls at the femto base station 101 again.

  FIG. 9 is a diagram illustrating a process flow and state transition when a packet is transmitted from the mobile phone 1 when there is no available radio resource in the femto base station 101 according to the present embodiment. In this case, the mobile phone 1 cannot perform EVDO communication in the femtocell A.

Similar to the example of FIG. 8, the mobile phone 1 is registered in the femto base station 101 by both the 1 × communication unit 40 and the EVDO communication unit 41 and is in a call waiting state before outgoing calls.
At this time, the control unit 30 periodically receives notification from the femto base station 101 via the 1x communication unit 40 that the use of radio resources has reached the upper limit by BCSMS (steps S11 to S12). .

At this time, when receiving a packet transmission request from the user, the control unit 30 makes a macro cell search request to the EVDO communication unit 41 (step S13), and the EVDO communication unit 41 searches the macro base station 102 (step S13). S14).
When the control unit 30 receives a notification of the completion of acquisition of the macro base station 102 (step S15), the control unit 30 performs position registration with respect to the macro base station 102, via the EVDO communication unit 41 that is in a call waiting state. Then, a transmission request is made to the macro base station 102 (steps S16 to S17).

  After communication with the macro base station 102 is established (step S18) and packet transmission / reception is performed, upon receiving a packet connection termination request, the control unit 30 transmits the request to the macro base station 102 via the EVDO communication unit 41. A disconnection request is made (steps S19 to S20).

  When the communication is disconnected (step S21), the EVDO communication unit 41 searches for the femto base station 101 registered by the 1x communication unit 40 using the PRL Association Tag function (step S22). If successful, the location is registered with the femto base station 101, and it becomes standby information for outgoing and incoming calls.

  As described above, according to the present embodiment, the mobile phone 1 is notified from the femto base station 101 that the use of the radio resource of the femto base station 101 that has registered the position has reached a predetermined upper limit. Therefore, when data communication is performed when the radio resources of the femto base station 101 are not available, the mobile phone 1 registers its position with another base station (macro base station 102) and starts communication.

  As a result, the femto base station 101 can efficiently use the radio resources up to the upper limit after removing the limit on the number of terminals that can be registered in position or raising the upper limit. Furthermore, since the radio communication system 100 suppresses communication exceeding the upper limit in the femto base station 101, high-speed communication can be stably provided. As a result, the mobile phone 1 is more likely to perform high-speed communication with the femtocell A.

  In addition, since the femto base station 101 notifies that the use of radio resources has reached a predetermined upper limit by BCSMS, it can efficiently notify all the mobile phones 1 that have registered their locations.

In addition, when both 1x and EVDO are used, if there is no available radio resource, only the EVDO location registration destination is changed, so 1x maintains location registration with the original femto base station 101. , The standby state for outgoing / incoming calls can be continued.
Furthermore, the cellular telephone device 1 can easily return the EVDO that has completed communication at the macro base station 102 to the femto base station 101 in which the location registration is continued by 1x by the Association Tag function.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

  The 1x system and the EVDO system in the above-described embodiment are merely examples, and other communication protocols may be used. For example, the present invention can be applied to a combination of a CDMA system and an LTE system.

  BCSMS is only an example in the CDMA2000_1x system, and may be a broadcast service in an approximate cell based on 3GPP. For example, e-MBMS (Multimedia Broadcast and Multicast Service) in the LTE scheme may be used.

  In addition, the wireless terminal device according to the present invention is not limited to the mobile phone 1, and various other devices such as PHS (registered trademark; Personal Handyphone System), PDA (Personal Digital Assistant), game machines, navigation devices, personal computers, etc. It can be applied to various terminal devices.

1 Mobile phone (wireless terminal device)
DESCRIPTION OF SYMBOLS 11 Operation part 21 Display part 30 Control part 40 1x communication part 41 EVDO communication part 50 Storage part 60 Voice control part 100 Wireless communication system 101 Femto base station 102 Macro base station 130 Control part 131 Determination part 132 Notification part 140 1x communication part 141 EVDO communication unit 150 storage unit

Claims (10)

  1. A wireless communication system having a wireless terminal device, a first base station, and a second base station capable of communication by the first communication method or the second communication method ,
    The first base station,
    A determination section for determining whether or not usage of non-linear resource reaches the top limit,
    If usage of the radio resources are determined to reach the upper limit by the determination unit, a notification unit that performs a notification for connecting the wireless terminal device newly communication request we row to another base station, the Prepared,
    The wireless terminal device
    When the radio resource usage status in the first base station reaches an upper limit when starting communication by the second communication scheme, the connection destination for the second communication scheme is set to the first base station. A wireless communication system comprising: a control unit that changes from the first base station to the second base station and maintains a connection destination in the first base station for the first communication method .
  2. Before SL first base station, a radio communication system according to claim 1, wherein the base station constituting a narrow area cell.
  3.   The wireless communication system according to claim 2, wherein the first base station is a base station constituting a femtocell.
  4. The wireless communication system according to any one of claims 1 to 3, wherein the notification unit notifies the connected wireless terminal device by a broadcast message.
  5. Wherein, when the signal passing Ru good in the second communication method is completed, according to claim 1 for changing the connection destination for the previous SL second communication method from said second base station to the first base station The wireless communication system according to any one of claims 1 to 4 .
  6. The first communication method is a CDMA2000_1x method, and the second communication method is a CDMA2000_1x_EVDO method.
    Wherein, the association tagging, the wireless communication system of claim 5 for changing the connection destination from said second base station for the previous SL second communication method to the first base station.
  7. A wireless terminal apparatus capable of by the communication with the first communication method or a second communication mode,
    When starting a communication through the second communication scheme, if the usage of the radio resources in the first base station is reached a predetermined upper limit, for said second communication method To connect the first change from the base station to a second base station, a radio terminal apparatus comprising a control unit for maintaining the connection destination by said first base station for the first communication scheme.
  8. A control method of a communication system having a wireless terminal device capable of communication by a first communication method or a second communication method, a first base station, and a second base station ,
    Previous Symbol radio terminal apparatus, when starting the communication, if the usage of the radio resources in the first base station is full, spontaneously said destination for said second communication system first control method from base stations including the second change to the base station, control steps to maintain the connection destination for the first communication scheme in the first base station.
  9. A wireless communication system having a wireless terminal device, a first base station, and a second base station,
    When the wireless terminal device is connected to the first base station and starts communication after receiving a notification from the first base station that the radio resource usage has reached the upper limit. A wireless communication system for changing a connection destination base station from the first base station to the second base station without transmitting a communication request to the first base station.
  10. A wireless terminal device connectable to the first base station or the second base station,
    In a state where the first base station is connected to the first base station, when receiving a notification from the first base station that the radio resource usage has reached the upper limit, the first base station A wireless terminal device that changes a connection destination base station from the first base station to the second base station without transmitting a communication request to the station.
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