JP2012085041A - Mobile communication system, base station, and transmission timing control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication system, a base station, and a transmission timing control method that can prevent a demodulation error of a radio signal at a mobile station if the same radio parameter such as diffusion code is used at peripheral base stations.SOLUTION: A mobile communication system of the invention comprises: a common control channel transmission unit for transmitting a common control channel to a service area formed by a base station; a common control channel receiving unit for receiving a peripheral common control channel transmitted by base stations 200, 20X situated at the periphery of a base station 201; a reception timing detection unit for detecting reception timing at the base station 201 of the periphery common control channel received by the common control channel receiving unit; and a transmission timing control unit for controlling in such a way that transmission timing of the common control channel transmitted by the base station 201 is different from reception timing at the base station 201 of the peripheral common control channel based on reception timing detected by the reception timing detection unit.

Description

  The present invention relates to a mobile communication system, a base station, and a transmission timing control method for controlling transmission timing of a common control channel transmitted from a base station managed by a mobile communication carrier or a user of a communication service provided by a mobile communication carrier. .

  Conventionally, in a mobile communication system, it is necessary to ensure the quality of service according to the content of a communication request generated from a mobile station without regularity. Therefore, the mobile communication carrier predicts the size of the service area and the traffic generated in the service area when installing the base station, and then installs and configures the base station and the spreading code used in the base station. In general, wireless parameters such as are designed using means such as simulation (for example, Non-Patent Document 1).

  In addition, in recent years, in addition to general base stations for public communications set up by mobile carriers, small base stations (for example, Home NodeB) such as femtocells installed by mobile station users at home have increased. (For example, refer nonpatent literature 2). When a mobile communication provider designs the above-described wireless parameters, it is necessary to consider the installation location of such a small base station.

  However, small base stations are expected to be densely installed in areas where multiple households are densely populated, such as apartment houses. In such a case, it is not practical to apply the conventional design method as described above because the design work and its evaluation become too complicated.

  In order to solve such problems, for example, in W-CDMA, the base station receives a common control channel transmitted from the neighboring base station, and automatically detects the spreading code used by the neighboring base station. A method has been proposed. The base station automatically assigns a spreading code different from the detected spreading code to itself.

  Thereby, man-hours required for design and evaluation of radio parameters can be reduced. Note that in such automatic allocation of spreading codes, a certain spreading code is used so that the autonomous spreading code assignment status by a small base station does not affect the design and evaluation of radio parameters of a general base station. Is generally allocated as a dedicated small base station.

Mori, et al., 2001 Shingaku Sodai, B-5-34, "W-CDMA area evaluation experiment using reception quality measurement system", March 2001 3GPP TS 22.220, Service requirements for Home NodeBs (UMTS) and Home eNodeBs (LTE)

  However, the conventional method as described above has the following problems. That is, since the total number of usable spreading codes is finite in the mobile communication system, the space of spreading codes that can be allocated exclusively for small base stations is limited.

  Therefore, when small base stations are densely installed in a certain area, there is a high possibility that the spreading codes used by the small base stations are duplicated between neighboring base stations. If spreading codes used between neighboring base stations overlap, a mobile station located in the area may not be able to properly demodulate the radio signal and may generate a demodulation error. In the case of the LTE system, the same problem may occur due to overlapping Physical Cell Identity (PCI).

  Therefore, the present invention has been made in view of such circumstances, and a mobile communication system capable of preventing radio signal demodulation errors in a mobile station even when radio parameters such as spreading codes overlap between neighboring base stations. An object of the present invention is to provide a base station and a transmission timing control method.

  A mobile communication system according to a feature of the present invention controls transmission timing of a common control channel transmitted from a base station managed by a mobile communication carrier or a user of a communication service provided by the mobile communication carrier. The mobile communication system receives a common control channel transmission unit that transmits the common control channel to a service area formed by the base station, and a peripheral common control channel that is transmitted from a peripheral base station located around the base station. A common control channel reception unit; a reception timing detection unit that detects a reception timing at the base station of the peripheral common control channel received by the common control channel reception unit; and the reception timing detected by the reception timing detection unit And a transmission timing control unit for controlling the transmission timing of the common control channel transmitted by the base station to be different from the reception timing. The transmission timing control unit determines the reception timing of the peripheral common control channel of the peripheral base station to which the same radio parameter as the base station is assigned among the peripheral common control channels transmitted by the peripheral base stations. On the other hand, control is performed such that the transmission timing of the common control channel is different from that of other peripheral common control channels.

  In the characteristics of the present invention described above, the transmission timing control unit may include at least one of a spreading code, a frequency, and a cell identifier as the radio parameter.

  In the above-described feature of the present invention, the transmission timing control unit is a peripheral base station having a high reception level at the base station of the peripheral common control channel among peripheral base stations to which the same radio parameters as the base station are assigned. The transmission timing of the common control channel may be controlled to be different from the reception timing of the peripheral common control channel transmitted by the station.

  In the above-described feature of the present invention, the reception timing detection unit is configured to prevent the reception disabled base station from receiving a non-receivable base station that is a peripheral base station that cannot receive the peripheral common control channel by the common control channel receiving unit. The transmission timing of the peripheral common control channel transmitted by the station may be acquired, and the acquired transmission timing may be detected as the reception timing at the base station of the peripheral common control channel transmitted by the non-receivable base station.

  The base station according to the feature of the present invention controls the transmission timing of the common control channel. A base station receives a common control channel transmitter that transmits the common control channel to a service area formed by the base station, and a common common control channel that is transmitted from a peripheral base station located around the base station. A control channel reception unit, a reception timing detection unit that detects a reception timing of the peripheral common control channel received by the common control channel reception unit at the base station, and a reception timing detected by the reception timing detection unit. Based on the transmission timing control unit that controls the transmission timing of the common control channel transmitted by the base station so as to be different from the reception timing, and the transmission timing control unit is transmitted by the plurality of neighboring base stations. Of the peripheral common control channels to be transmitted, the same radio as the base station Parameter for the received timing near the common control channel of a neighboring base station is assigned, the transmission timing of the common control channel is controlled to be different.

  The transmission timing control method according to the feature of the present invention controls the transmission timing of a common control channel transmitted from a mobile communication carrier or a base station managed by a user of a communication service provided by the mobile communication carrier. The transmission timing control method includes a step of receiving a peripheral common control channel transmitted from a peripheral base station located around the base station, and a step of detecting a reception timing of the received peripheral common control channel at the base station And the step of controlling the transmission timing of the common control channel transmitted by the base station to be different from the reception timing based on the detected reception timing, and the service area formed by the base station. Transmitting a control channel, and in the step of controlling the transmission timing of the common control channel, among the peripheral common control channels transmitted by the plurality of peripheral base stations, the same radio parameter as the base station is provided. Receiver of the peripheral common control channel of the assigned peripheral base station Relative timing, the transmission timing of the common control channel is controlled to be different.

  According to the features of the present invention, there are provided a mobile communication system, a base station, and a transmission timing control method capable of preventing demodulation errors of radio signals in a mobile station even when radio parameters such as spreading codes overlap between neighboring base stations. be able to.

1 is an overall schematic configuration diagram of a mobile communication system according to an embodiment of the present invention. It is a functional block block diagram of the base station 201 which concerns on embodiment of this invention. It is a figure which shows the whole operation | movement sequence of the mobile communication system in case the base station 201 which concerns on embodiment of this invention is newly installed. It is a figure which shows the determination operation | movement flow of the transmission timing of the common control channel in the base station control apparatus 100 which concerns on embodiment of this invention. It is a figure which shows the concept of the reception timing difference of the common control channel which concerns on embodiment of this invention. It is a figure which shows the example of provision of the priority which avoids duplication of the reception timing of the common control channel which concerns on embodiment of this invention. It is a figure which shows the selection concept of the transmission timing of the common control channel which concerns on embodiment of this invention. It is a figure which shows the concept of path | pass detection time width (tau) 'which the mobile station 300 located in the base station 201 which concerns on embodiment of this invention detects as a radio signal transmitted from the base station 201. FIG.

  Next, an embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(1) Overall Schematic Configuration of Mobile Communication System FIG. 1 is an overall schematic configuration diagram of a mobile communication system according to the present embodiment. Specifically, FIG. 1 shows a configuration example of a typical radio access network in a mobile communication system.

  The mobile communication system shown in FIG. 1 is compliant with W-CDMA, and base stations 200 to 204 are connected to be communicable with a base station controller 100 (RNC). The base station control apparatus 100 executes, for the base stations 200 to 204, assignment and management of radio parameters necessary for the base station to perform radio communication with the mobile station 300. Moreover, the base station control apparatus 100 controls the transmission timing of the common control channel transmitted from the base stations 200 to 204.

  Base station 200 to base station 202 are small base stations (Home NodeB) managed by users of communication services provided by mobile communication carriers. Base station 200 to base station 202 are installed on a mobile communication carrier network 10 via an access line carrier network 20 that is installed in a local area network (LAN) managed by the user and provides FTTH and ADSL. Connected to the base station controller 100. A mobile communication network 30 is formed by the mobile communication operator network 10 and the access line operator network 20.

  A security gateway (SGW) 400 is installed at the boundary between the mobile communication carrier network 10 and the access line carrier network 20. The SGW 400 is a gateway for protecting the mobile operator network 10 against unauthorized access from other communication networks. The SGW 400 permits only access to the mobile communication carrier network 10 that is authorized by a predetermined authentication procedure.

  In the present embodiment, it is assumed that the base station 200 to the base station 202 are owned by different users. For this reason, the user's mobile station managing one base station is not permitted to connect to the other base station. On the other hand, the base station 203 and the base station 204 are base stations (NodeB) for public communication, and are installed on the mobile communication carrier network 10. If it is a mobile station of a user of a mobile communication carrier, it can connect to the base station 203 and the base station 204 without any particular limitation.

  The base station 203 and the base station 204 constitute a general base station that forms the cell C1. On the other hand, the base station 200 to the base station 202 form a cell C2 having a smaller cell size than the cell C1. In the present embodiment, the base station 200 to the base station 202 constitute a small base station.

(2) Functional Block Configuration of Mobile Communication System Next, a functional block configuration of the mobile communication system according to the present embodiment will be described. Specifically, the functional block configuration of the base station 201 constituting the small base station in the present embodiment will be described. FIG. 2 is a functional block configuration diagram of the base station 201. Other base stations (base stations 200, 202 to 204) also have the same configuration as base station 201.

  As shown in FIG. 2, the base station 201 includes a common control channel transmission unit 211, a common control channel reception unit 213, a reception timing detection unit 215, and a transmission timing control unit 217.

  The common control channel transmission unit 211 transmits the common control channel to the entire service area (cell C2) formed by the base station 201. In the present embodiment, a common pilot channel (CPICH) is used as a common control channel. The common control channel is a control channel that can be received by the entire service area (cell C2) and the neighboring base stations.

  The common control channel receiving unit 213 receives a common control channel (peripheral common control channel) transmitted from peripheral base stations (for example, the base station 200 and the base station 203) located around the base station 201. The peripheral base station means a base station that transmits a common control channel that may be affected by the base station 201, and is not necessarily limited to a base station that transmits a common control channel that the base station 201 can always receive. Absent.

  The common control channel reception unit 213 outputs the received common control channel of the neighboring base station to the reception timing detection unit 215.

  The reception timing detection unit 215 detects the reception timing at the base station 201 of the common control channel received by the common control channel reception unit 213. Specifically, the reception timing detection unit 215 detects the reception timing based on the temporal position within the chip period (38400 chips).

  In addition, the reception timing detection unit 215 receives a base station (for example, a base station) that cannot receive a peripheral base station (hereinafter, a base station that cannot be received) that cannot receive the common control channel by the common control channel reception unit 213. 204) acquires the transmission timing of the common control channel transmitted from the base station 204. Note that the transmission timing of the common control channel transmitted by the base station 204 may be acquired from the base station 204 via the base station control device 100, or the base station control device 100 may transmit the common control channel by the base station 204. When the timing is recognized, the transmission timing may be acquired from the base station control apparatus 100.

  The reception timing detection unit 215 can detect the acquired transmission timing of the common control channel of the base station 204 as the reception timing at the base station 201 of the common control channel (peripheral common control channel) transmitted by the base station 204. .

  Based on the reception timing of the peripheral common control channel detected by the reception timing detection unit 215, the transmission timing control unit 217 differs the transmission timing of the common control channel transmitted by the base station 201 from the reception timing of the peripheral common control channel. To control.

  Specifically, the transmission timing control unit 217 determines the peripheral common control channel of the peripheral base station to which the same radio parameter as that of the base station 201 is assigned among the peripheral common control channels transmitted by the plurality of peripheral base stations. Control is performed so that the transmission timing of the common control channel of the base station 201 is different from the reception timing. In the present embodiment, the same radio parameter is a spreading code (ScC) assigned to the base station.

  More specifically, the transmission timing control unit 217 prioritizes the reception timing of the peripheral common control channel of the peripheral base station to which the same radio parameter as that of the base station 201 is assigned over other peripheral common control channels. Then, control is performed so that the transmission timing of the common control channel of the base station 201 is different.

  The transmission timing control unit 217 is transmitted by a peripheral base station having a high reception level at the base station 201 of the peripheral common control channel among peripheral base stations to which the same radio parameter (ScC) as that of the base station 201 is assigned. It is also possible to perform control so that the transmission timing of the common control channel of the base station 201 is different from the reception timing of the peripheral common control channel prior to other peripheral common control channels.

  A specific method for controlling the transmission timing of the common control channel transmitted by the base station 201 will be described later.

(3) Operation of Mobile Communication System Next, the operation of the mobile communication system described above will be described. FIG. 3 shows an overall operation sequence of the mobile communication system when the base station 201 is newly installed.

FIG. 4 shows an operation flow for determining the transmission timing of the common control channel in the base station controller 100.

(3.1) Overall Operation Sequence of Mobile Communication System Here, it is assumed that the number of dedicated spreading codes that can be assigned to the base station 200 and the base station 201 (Home Node B) is only one. 200 and base station 201 are assigned the same spreading code (ScC).

  As shown in FIG. 3, the base station 201 is installed around the base station 200 that is already installed (for example, in the same apartment house). The base station 201 performs an initial startup operation (step S1000).

  The base station 201 searches for a common control channel transmitted by neighboring base stations (here, the base station 200 and the base station 203) (step S1001). Here, the base station 201 receives the common control channel (peripheral common control channel) transmitted by the base station 200 and the base station 203.

  The base station 201 measures the reception level (dBm) of the received common control channel (step S1002).

  The base station 201 detects the reception timing of the common control channel received from the base station 200 and the base station 203 with reference to a BFN (NodeB Specific Frame Number) synchronized with the operation clock of the base station 201. (Step S1003). Specifically, the base station 201 measures how much the reception timing of the common control channel of the base station 200 and the base station 203 is shifted with reference to the BFN.

  FIG. 5 shows the concept of the reception timing difference of the common control channel. As illustrated in FIG. 5, the base station 201 uses the BFN timing of its own station as a reference, and receives the common control channel transmission timing (SFN (Cell System Frame Number) timing) transmitted by the base station 200 and the base station 203. Difference α (base station 200) and difference β (base station 203) are measured.

  Next, as shown in FIG. 3, the base station 201 performs base station control on the reception level of the common control channel of the base station 200 and the base station 203, the reception timing, and the spreading code (ScC) used for the common control channel. The apparatus 100 is notified (step S1004).

  The base station control apparatus 100 determines the transmission timing of the common control channel in the base station 201 based on the notified reception level, reception timing, and spreading code (step S1005). The transmission timing determination operation will be described later.

  The base station control apparatus 100 notifies the base station 201 of the determined transmission timing of the common control channel (step S1006).

(3.2) Operation for Determining Transmission Timing of Common Control Channel As shown in FIG. 4, the base station control apparatus 100 is configured to use spreading codes (ScC) of peripheral base stations (base station 200 and base station 203) of the base station 201. (Step S2000).

  The base station control apparatus 100 extracts a peripheral base station (base station 200) to which the same spreading code as that of the base station 201 is assigned (step S2001).

  The base station control device 100 refers to the reception level of the neighboring base station to which the same spreading code is assigned (step S2002).

  The base station control device 100 selects a peripheral base station having a high common control channel reception level as a base station having a higher priority than other peripheral base stations to avoid duplication of the reception timing of the common control channel (step S2003). ).

  FIG. 6 shows an example of assigning priority to avoid duplication of reception timing of the common control channel. As illustrated in FIG. 6, the priority assignment table 500 includes a spreading code and a reception level (unit: dBm) of the common control channel. The priority assignment table 500 indicates that spreading code # 1 is assigned to the base station 201 (own station) (first line of the priority assignment table 500). The base station 200 (second line of the priority assignment table 500) to which the same spreading code # 1 as that of the own station is assigned is selected as a peripheral base station having a high priority for avoiding the duplication. In addition, a neighboring base station (third row of the priority assignment table 500) having the highest reception level of the common control channel is selected as the base station having the next highest priority.

  As illustrated in FIG. 4, the base station control device 100 extracts reception timings in order from the neighboring base stations with the highest priority according to the above-described procedure, and prohibits transmission of the common control channel over a certain time width including the reception timing. Set as time width τ. The base station control apparatus 100 determines a transmission prohibition time width τ for a state in which only one candidate for changing the transmission timing of the common control channel remains, or for all the neighboring base stations that should avoid the duplication (step S2004). -Step S2007).

  When only one common control channel transmission timing candidate remains, the base station control apparatus 100 determines the remaining transmission timing as the common control channel transmission timing in the base station 201 (step S2008).

  On the other hand, when the base station controller 100 calculates the transmission prohibition time width τ for all the neighboring base stations that should avoid the duplication, the base station control apparatus 100 randomly transmits the transmission timing candidates excluding the transmission prohibition time width τ. Timing is determined (step S2009).

  FIG. 7 shows the concept of selecting the transmission timing of the common control channel. As shown in FIG. 7, the base station control device 100 is configured to control the common control channel of the base station 200, the base station 20X, and the base station 20Y (Home Node B) detected as the peripheral base station of the base station 201 (own station). Each τ time including the reception timing is set as a transmission prohibited range of the common control channel. The base station control device 100 transmits the common control channel in the base station 201 in a time (time 600, time 700, time 800, and time 900) obtained by removing the transmission prohibition time width τ from the frame time (10 msec (38400 chips)). Determine the timing randomly. Note that τ time corresponds to a time width for determining a radio signal detected by the mobile station 300 as a signal received from the same cell (base station).

(4) Actions / Effects Next, actions and effects of the mobile communication system according to the present embodiment described above will be described. FIGS. 8A and 8B show the concept of the path detection time width τ ′ that the mobile station 300 located in the base station 201 detects as a radio signal transmitted from the base station 201. FIG.

  As shown in FIG. 8A, the mobile station 300 receives the radio signal from the base station 201 for the radio signal received within the path detection time width τ ′ including the reception timing of the common control channel from the base station 201. Is determined. Accordingly, the mobile station 300 determines the path detection time width τ ′ from the reception timing of the common control channel from the base station 201 for the radio signals transmitted from the base station 200 and the base station 20X to which the same spreading code is assigned. If it deviates from the above, since it is determined that the radio signal is from a base station different from the base station 201, a demodulation error of the radio signal transmitted from the base station 201 can be avoided.

  On the other hand, as shown in FIG. 8B, if the reception timing of the common control channel overlaps within the path detection time width τ ′ in the base station 201 and the base station 20X to which the same spreading code is assigned, the mobile station moves. Since the station 300 determines that radio signals from the base station 201 and the base station 20X are radio signals from the base station 201, the mobile station 300 executes reception processing of radio signals from both base stations and demodulates them. An error occurs.

  That is, according to the mobile communication system according to the present embodiment described above, among the common control channels (peripheral common control channels) transmitted by a plurality of neighboring base stations, the same spreading code as that of the own station is assigned. Control is performed such that the transmission timing of the common control channel of the base station differs from the reception timing of the common control channel of the base station. For this reason, even when the spreading codes used between neighboring base stations overlap, the mobile station 300 can normally demodulate the radio signal and avoid the occurrence of demodulation errors.

  In this embodiment, with respect to the reception timing of the common control channel from the peripheral base station having a high reception level of the common control channel, the common control channel of the own station is given priority over the common control channel from other peripheral base stations. The transmission timing is controlled to be different. For this reason, it is possible to reliably avoid the influence of the common control channel from the peripheral base station that is likely to cause a demodulation error in the mobile station 300.

  In the present embodiment, even when the common control channel from the neighboring base station cannot be received, the transmission timing of the common control channel from the neighboring base station (receivable base station) is obtained, and the obtained transmission timing is used as the neighboring base station. Can be detected as reception timing. For this reason, even when the local station cannot receive the common control channel, it is possible to reliably avoid the demodulation error of the mobile station 300.

(5) Other Embodiments As described above, the content of the present invention has been disclosed through one embodiment of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. should not do. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.

  For example, in the above-described embodiment, an example in which a spreading code is used as a radio parameter has been described. However, a radio frequency or a cell identifier may be used instead of the spreading code.

  In the above-described embodiments, W-CDMA has been described as an example. However, the present invention can also be applied to LTE (Long Term Evolution), which is a next-generation system of W-CDMA. In the case of LTE, the base station may have the function of the base station control device 100 described above. Further, each function of the base station control apparatus 100 may be distributed and implemented in the base station and the base station control apparatus 100.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 10 ... Mobile communication carrier network 20 ... Access line carrier network 30 ... Mobile communication network 100 ... Base station control apparatus 200-204 ... Base station 211 ... Common control channel transmission part 213 ... Common control channel reception part 215 ... Reception timing detection Unit 217 ... transmission timing control unit 300 ... mobile station 400 ... SGW
500 ... Priority assignment table 600,700,800 ... Time C1, C2 ... Cell

Claims (6)

A mobile communication system that controls transmission timing of a common control channel transmitted from a mobile communication carrier or a base station managed by a user of a communication service provided by the mobile communication carrier,
A common control channel transmitter for transmitting the common control channel to a service area formed by the base station;
A common control channel receiver for receiving a peripheral common control channel transmitted from a peripheral base station located around the base station;
A reception timing detection unit for detecting a reception timing at the base station of the peripheral common control channel received by the common control channel reception unit;
A transmission timing control unit for controlling the transmission timing of the common control channel transmitted by the base station to be different from the reception timing based on the reception timing detected by the reception timing detection unit;
The transmission timing control unit determines the reception timing of the peripheral common control channel of the peripheral base station to which the same radio parameter as the base station is assigned among the peripheral common control channels transmitted by the peripheral base stations. On the other hand, a mobile communication system that controls the transmission timing of the common control channel to be different.   The mobile communication system according to claim 1, wherein the transmission timing control unit includes at least one of a spreading code, a frequency, and a cell identifier as the radio parameter.   The transmission timing control unit is configured to transmit the peripheral common control signal transmitted by a peripheral base station having a high reception level at the base station of the peripheral common control channel among peripheral base stations to which the same radio parameters as the base station are assigned. The mobile communication system according to claim 1, wherein control is performed so that transmission timing of the common control channel differs with respect to reception timing of the control channel in preference to other peripheral common control channels. The reception timing detector
For the reception-incapable base station that is a peripheral base station that cannot receive the peripheral common control channel by the common control channel reception unit, obtain the transmission timing of the peripheral common control channel transmitted by the non-receivable base station,
The mobile communication system according to claim 1, wherein the acquired transmission timing is detected as a reception timing at the base station of the peripheral common control channel transmitted by the unreceivable base station. A base station that controls transmission timing of a common control channel,
A common control channel transmitter for transmitting the common control channel to a service area formed by the base station;
A common control channel receiver for receiving a peripheral common control channel transmitted from a peripheral base station located around the base station;
A reception timing detection unit for detecting a reception timing at the base station of the peripheral common control channel received by the common control channel reception unit;
A transmission timing control unit for controlling the transmission timing of the common control channel transmitted by the base station to be different from the reception timing based on the reception timing detected by the reception timing detection unit;
The transmission timing control unit determines the reception timing of the peripheral common control channel of the peripheral base station to which the same radio parameter as the base station is assigned among the peripheral common control channels transmitted by the peripheral base stations. On the other hand, a base station that controls the transmission timing of the common control channel to be different. A transmission timing control method for controlling the transmission timing of a common control channel transmitted from a mobile communication carrier or a base station managed by a user of a communication service provided by the mobile communication carrier,
Receiving a peripheral common control channel transmitted from a peripheral base station located around the base station;
Detecting the reception timing of the received peripheral common control channel at the base station;
Based on the detected reception timing, the step of controlling the transmission timing of the common control channel transmitted by the base station to be different from the reception timing; and the common control channel in the service area formed by the base station The step of transmitting,
In the step of controlling the transmission timing of the common control channel, among the peripheral common control channels transmitted by the plurality of peripheral base stations, the peripheral common of the peripheral base stations to which the same radio parameters as the base station are assigned A transmission timing control method for controlling the transmission timing of the common control channel to be different from the reception timing of the control channel.

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