JP6164847B2 - Wireless base station - Google Patents

Description

  The present invention relates to a radio base station.

  In Release-10 of LTE (Long Term Evolution), CA (Carrier Aggregation) is defined.

  Such CA is a technique for improving the peak rate and throughput of data of the mobile station UE, and is realized by performing communication using two or more CCs (Component Carriers).

  In order to implement CA, as shown in FIG. 3, the radio base station eNB adds a Scell (Secondary cell) to the mobile station UE in the RRC (Radio Resource Control) layer. After performing the configuration, it is necessary to activate the Scell, that is, to perform “Scell Activation” in the MAC (Media Access Control) layer.

  Thereafter, the radio base station eNB can perform settings for changing or deleting the Scell, or deactivate the Scell, that is, perform “Scell Deactivation” with respect to the mobile station UE.

  Further, as such CA, there are CA by a plurality of macro cells in different bands, “Inter-band CA”, “Intra-band CA” between the macro cell and the small cell, and the like.

  Here, the radio base station eNB is configured to be able to set a combination of bands (cells) capable of performing CA, that is, “Band combination”.

  In the example of FIG. 4, CA can be performed using a 1.5 GHz band cell and a 2 GHz band cell, and CA can be performed using a 2 GHz band cell and an 800 MHz band cell. It is set so that CA cannot be performed using a cell of .5 GHz band and a cell of 800 MHz band.

  Then, as illustrated in FIG. 5, the radio base station eNB performs “Measurement Configuration” for Event-A3 (or Event-A4) with respect to the mobile station UE by “RRC Connection Reconfiguration” based on the setting. The mobile station UE performs measurement processing based on the “Measurement Configuration”, and when the Event-A3 (or Event-A4) is satisfied, the wireless base station notifies the fact by the “Measurement Report”. It is configured to report to the eNB.

  The radio base station eNB is configured to be able to add a cell specified by PCI / ECGI included in the “Measurement Report” as a Scell.

3GPP TS36.300

  However, the radio base station eNB may not be able to add a cell specified by PCI / ECGI included in “Measurement Report” as a Scell.

  For example, as shown in FIG. 6, when the congestion level of a 2 GHz band cell is too high, there is no point in adding the 2 GHz band cell as a Scell.

  In addition, as illustrated in FIG. 7, the mobile station UE in the “RRC_Connected state” in the cell under the radio base station eNB # A transmits the radio base station eNB # A to the radio base station eNB # A by “Measurement Report” by radio When reporting a 1.5 GHz band cell (PCI # 10) under the base station eNB # B, the 1.5 GHz band cell (PCI # 10) cannot be added as a Scell.

  In the conventional mobile communication system, there is a problem in that information about a cell that cannot be added as a Scell cannot be fed back to cell planning by a communication carrier.

  Therefore, the present invention has been made in view of the above-described problems, and can manage a cell base that cannot be added as a Scell, thereby enabling a radio base station to be used for cell planning by a communication carrier. The purpose is to provide.

  A first feature of the present invention is a radio base station configured to manage whether or not a cell specified by cell identification information included in a measurement report can be added as a secondary cell. The main point is to have a management section.

  As described above, according to the present invention, it is possible to provide a radio base station that can be utilized for cell planning by a telecommunications carrier by managing information about cells that cannot be added as Scells. .

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a figure for demonstrating a prior art. It is a figure for demonstrating a prior art. It is a figure for demonstrating a prior art. It is a figure for demonstrating a prior art. It is a figure for demonstrating a prior art.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG.1 and FIG.2, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes a TCE (Trace Collection Entity) that is an MDT server, a radio base station eNB, and the like.

  In the mobile communication system according to the present embodiment, “Immediate MDT” and “Logged MDT” defined in the LTE Release-11 scheme can be realized.

  In the example illustrated in FIG. 1, the mobile station UE is assumed to be a person who performs communication using a Pcell (Primary Cell) serving as a serving cell of a PCC (Primary Carrier) under the control of the radio base station eNB.

  As illustrated in FIG. 2, the radio base station eNB according to the present embodiment includes a reception unit 11, a management unit 12, and a transmission unit 13.

  The receiving unit 11 is configured to receive various signals from the mobile station UE and TCE.

  For example, the receiving unit 11 is configured to receive “Measurement Report” indicating that Event-A1 to A6 / B1 / B2 are satisfied from the mobile station UE.

  For each mobile station UE, the management unit 12 includes cell identification information (PCI: Physical Cell Identity / ECGI: E-UTRAN Cell Global Identifier), frequency, and “Event-A1” in the “Measurement Report” received by the reception unit 11. ˜A6 / B1 / B2 ”and“ RSRQ (Reference Signal Received Quality˜ / RSRP (Reference Signal Received Power) ”.

  In addition, the management unit 12 adds a cell specified by PCI (Physical Cell Identity) / ECGI (E-UTRAN Cell Global Identifier) included in “Measurement Report (for example, Event-A3 / A4)” as a Scell. It is configured to manage whether or not it is possible.

  For example, as illustrated in FIG. 6 described above, the management unit 12 determines that the congestion level of the cell specified by the PCI / ECGI included in the “Measurement Report (for example, Event-A3 / A4)” is lower than a predetermined threshold. When it is high, it may be configured to manage such a cell as not being addable as a Scell.

  In addition, as illustrated in FIG. 7 described above, the management unit 12 determines that a cell specified by PCI / ECGI included in “Measurement Report (for example, Event-A3 / A4)” is the radio base station eNB. When managed by a different radio base station eNB (for example, a radio base station eNB provided at a position more than a predetermined distance from the radio base station eNB), such a cell is managed not to be added as a Scell. It may be configured.

  In addition, when the above-mentioned cell cannot be added as a Scell, the management unit 12 may be configured to manage the reason (Cause) that the cell cannot be added as a Scell.

  Here, the reason described above may indicate that the congestion level in Scell is higher than a predetermined threshold.

  Or the above-mentioned reason may show that Scell is managed by the wireless base station different from the wireless base station eNB which manages Pcell (distant supplement).

  Further, the management unit 12 may be configured to manage throughput, position information, and the like for the target mobile station UE of “Immediate MDT”.

  The transmission unit 13 is configured to transmit various signals to the mobile stations UE and TCE.

  For example, the transmission unit 13 may be configured to report the content managed by the management unit 12 to the TCE.

  The characteristics of the present embodiment described above may be expressed as follows.

  The first feature of the present embodiment is a radio base station eNB, and a cell specified by PCI / ECGI (cell identification information) included in “Measurement Report” is a Scell (secondary cell). The management section 12 is configured to manage whether or not it can be added as a gist.

  According to this configuration, the radio base station eNB determines that a cell specified by PCI / ECGI included in “Measurement Report (for example, Event-A3 / A4)” can perform CA together with Pcell. Even if it is set, it can be determined that such a cell is not added as a Scell according to the actual communication environment, communication state, and the like.

  In the first feature of the present embodiment, when the above-described cell cannot be added as a Scell, the management unit 12 may be configured to manage the reason why such a cell cannot be added as a Scell.

  According to this feature, the communication carrier can determine whether the reason why the above-described cell cannot be added as a Scell is temporary or permanent.

  In the first feature of the present embodiment, the reason described above may indicate that the congestion level in Scell is higher than a predetermined threshold.

  According to such a feature, when the communication carrier performs cell planning, it is possible to consider the congestion situation in each cell.

  In the first feature of the present embodiment, the reason described above may indicate that the Scell is managed by a radio base station different from the radio base station eNB that manages the Pcell (primary cell).

  According to this feature, when the carrier performs cell planning, it is possible to take into account the situation of remote supplementation in each cell.

  1st characteristic of this embodiment WHEREIN: You may comprise the transmission part 13 comprised so that the content managed by the management part 12 may be reported with respect to TCE (predetermined server).

  According to this feature, the communication carrier can perform cell planning based on information transmitted from the radio base station eNB to the TCE.

  The operations of the mobile station UE, the radio base station eNB, and the TCE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. Also good.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE, the radio base station eNB, or the TCE. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE, the radio base station eNB, or the TCE.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station eNB ... radio base station 11 ... reception unit 12 ... measurement unit 13 ... management unit 14 ... transmission unit

Claims (3)

A management unit configured to manage whether or not the cell specified by the cell identification information included in the measurement report can be added as a secondary cell ;
When the radio base station that manages the primary cell and the radio base station that manages the secondary cell are provided at positions separated by a predetermined distance or more, the management unit cannot add the cell as the secondary cell. A radio base station that is managed as The management unit, the radio base station according to claim 1, characterized in that the cell is configured to manage the reasons not be added as the secondary cell. For a given server, the radio base station according to claim 1 or 2, characterized in that it comprises a transmission unit configured to report the contents managed by the management unit.

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