JP5008403B2 - Mobile station apparatus, base station apparatus, and propagation status collection method - Google Patents

Description

  The present invention relates to an LTE (Long Term Evolution) system, and more particularly to a mobile station apparatus, a base station apparatus, and a propagation status collection method.

  A communication method succeeding W-CDMA and HSDPA (generic name UMTS), that is, LTE (Long Term Evolution) has been studied by the UMTS standardization organization 3GPP. As for the uplink, SC-FDMA (Single-Carrier Frequency Multiple Access) has been studied (for example, see Non-Patent Document 1).

In UMTS, when a new cell is introduced, the installation location, antenna, radio parameters, and the like are examined on a desktop using a simulation tool or a link budget (see, for example, Non-Patent Document 2). A new base station will be constructed based on these results. Prior to actual operation, the newly installed base station apparatus is provisionally operated and a pilot channel is transmitted. The operator measures the radio wave transmitted from the newly installed base station apparatus with the radio wave measuring apparatus and adjusts the radio parameter. The radio wave measurement apparatus is mounted on a dedicated vehicle, and measurement data is acquired when an operator goes around the road in the measurement target area with the dedicated vehicle.
3GPP TR 25.814 (V7.0.0), "Physical Layer Aspects for Evolved UTRA," June 2006 Keiji Tachikawa, “W-CDMA mobile communication system”, Maruzen Co., pp. 197-199, 2001 3GPP R2-061929 June 2006

  The design and operation of a new base station as in the past, particularly optimization of various parameters of antennas and radios, required a great deal of effort for desktop examination and radio wave propagation measurement. In order to reduce this effort, in 3GPP, when a new LTE base station is newly installed, the new base station is connected to the network with a cable and the power is turned on to automatically set it. Has been proposed (see Non-Patent Document 3). In particular, in response to future communication demands, it is desirable to realize such an automatic setting function, assuming a situation in which a large number of small base station devices such as home use base stations are installed.

  However, this proposal is based on a concept, and specific configurations of the base station apparatus and the mobile station apparatus are not proposed.

  When a new base station apparatus is installed, it is necessary to set radio parameters based on reception quality at each point of radio waves transmitted from the newly installed base station apparatus.

  Accordingly, an object of the present invention is to provide a mobile station device, a base station device, and a propagation status collection method that can collect information on the propagation status of radio waves transmitted from a newly installed base station device.

In order to solve the above problems, the mobile station apparatus of the present invention
A synchronization channel indicating a pre-operation state that is a state before the operation state is transmitted from the newly installed base station device,
Cell search means for receiving a synchronization channel;
New base station apparatus determination means for determining, based on the received synchronization channel, whether or not the base station apparatus that transmitted the synchronization channel is in a pre-operation state;
The newly If it is determined that pre-operation state by the base station apparatus determining means, receiving the pilot channel transmitted from the identifier and / or the newly established base station apparatus of the newly established base station (new cell) Notification means to notify the quality;
Equipped with a,
The notifying means also notifies the identifier of another base station apparatus (cell) different from the newly established base station apparatus and the reception quality of a pilot channel transmitted from the other base station apparatus .

  By configuring in this way, it is possible to automatically collect information on the propagation state of the radio wave transmitted from the newly installed base station apparatus, so that the introduction of the newly installed base station (new cell) can be made efficient.

The base station apparatus of the present invention
A group Chikyoku apparatus:
State setting means for setting the pre-operation state that is the state before the operation state;
Synchronization channel creation means for creating a synchronization channel indicating the pre-operation state when the state setting means sets the pre-operation state;
Transmitting means for transmitting the synchronization channel;
An identifier of the base station device in the pre-operation state and / or a reception quality of the pilot channel from the base station device in the pre-operation state from the mobile station device that has received the synchronization channel transmitted by the transmission means, Receiving means for receiving an identifier of another base station apparatus (cell) different from the base station apparatus in the operation state, and reception quality of a pilot channel transmitted from the other base station apparatus;
Ru equipped with.

  With this configuration, it is possible to notify that the base station apparatus is in the pre-operation state before the operation state.

The propagation status collection method of the present invention comprises:
A transmission step in which a synchronization channel indicating a pre-operation state that is a state before the operation state is transmitted from the newly installed base station apparatus;
A cell search step in which the mobile station apparatus receives the synchronization channel;
A new base station apparatus determination step in which the mobile station apparatus determines, based on the received synchronization channel, whether or not the base station apparatus that has transmitted the synchronization channel is in a pre-operation state;
If the judged by a new base station determining step that the pre-operation state, send the mobile station apparatus, the identifier and / or the newly established base station apparatus of the newly established base station (new cell) A notification step of notifying reception quality of the pilot channel to be performed;
I have a,
Wherein in the notification step, the identifier of a different other base station apparatus and the newly established base station (cell), the reception quality of pilot channels sent from the other base station apparatus also notice.

  By doing so, it is possible to automatically collect information about the propagation state of the radio wave transmitted from the newly installed base station apparatus, so that the introduction of new cells can be made more efficient.

  According to the embodiments of the present invention, it is possible to realize a mobile station device, a base station device, and a propagation status collection method that can collect information on the propagation status of radio waves transmitted from a newly installed base station device.

Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings.
In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

  Next, the base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  The base station apparatus 200 according to the present embodiment is a newly installed base station apparatus that is newly installed, and is in a pre-operation state that is a state before the start of operation. Base station apparatus 200 transmits a synchronization channel indicating a pre-operation state.

  The pre-operation state refers to the state of the newly installed base station apparatus before starting operation. The new base station apparatus is turned on after being connected to the network by a cable, for example. For example, when connected to an IP network, IP address determination, server detection, authentication processing, association with an upper node, software activation, and the like are performed. After these operations are performed, the newly installed base station apparatus transmits a reference symbol (pilot signal), a synchronization channel, and a minimum amount of broadcast information. It cannot be provided. This state is called a pre-operation state. Therefore, in this pre-operation state, the mobile station device 100 cannot stand by in the cell and cannot access the cell.

  The base station apparatus 200 includes a transmission RF unit 202, a synchronization channel creation unit 204, and a state setting unit 206.

  The state setting unit 206 is set to the state of the base station apparatus 200, for example, the operation state and the pre-operation state. For example, when the own base station apparatus 200 is a newly installed base station apparatus, the pre-operation state is set. In this case, the state setting unit 206 sets a synchronization channel pattern indicating the pre-operation state, and inputs the synchronization channel pattern indicating the pre-operation state to the synchronization channel creation unit 204. The synchronization channel pattern indicating the pre-operation state may be specified in advance in the specification, or may be broadcast from an existing base station apparatus (neighboring cell).

  The synchronization channel creation unit 204 creates a synchronization channel configured by a synchronization channel pattern indicating the pre-operation state input by the state setting unit 206 and transmits the synchronization channel via the RF transmission unit 202.

  The synchronization channel creation unit 204 transmits a synchronization channel pattern indicating a pre-operation state, for example, for a predetermined period of each slot.

  Next, the mobile station apparatus 100 according to the present embodiment is described with reference to FIG.

  When the mobile station apparatus 100 according to the present embodiment receives the synchronization channel transmitted by the base station apparatus 200, whether or not the pattern of the synchronization channel configuring the synchronization channel is a pattern indicating that it is in the pre-operation state. Determine whether. When the mobile station device 100 receives a synchronization channel configured by a synchronization channel pattern indicating a pre-operation state, the mobile station device 100 measures the reception quality of the pilot channel transmitted by the newly installed base station device 200, for example, SIR. Report to the network. For example, the mobile station apparatus 100 may transmit the reception quality of the pilot channel transmitted by the newly installed base station apparatus 200 that has transmitted the synchronization channel to the newly installed base station apparatus 200, or the existing base station apparatus, For example, you may make it transmit to the base station apparatus which covers the area which exists.

  The mobile station device 100 includes a cell search unit 102, a control unit 104 as a new base station device determination unit, a reception quality measurement unit 106, a notification unit 108, a broadcast channel reception unit 110, and a cell selection unit 112. Prepare.

  The cell search unit 102 performs cell search by performing cell search every predetermined period, for example, 200 ms. When the cell search unit 102 detects a new cell, the cell search unit 102 detects the transmission timing of the base station apparatus by correlating with the chip sequence of the primary synchronization channel based on the received synchronization channel. Based on this, the pattern of the secondary synchronization channel sequence is obtained and input to the control unit 104.

  Control section 106 determines whether or not the synchronization channel pattern (secondary synchronization channel sequence pattern) input by cell search section 102 matches the pattern assigned to the base station apparatus in the pre-operation state. . When it is determined that the pattern of the synchronization channel matches the pattern assigned to the base station apparatus in the pre-operation state, the control unit 106 receives the pilot channel transmitted from the newly installed base station apparatus to the reception quality measurement unit 108. Command to measure quality, eg SIR. The control unit 106 notifies the reception quality of the pilot channel transmitted from the new base station apparatus measured by the reception quality measurement unit 108 to the new base station apparatus or the existing base station apparatus via the notification unit 110. In addition, the identifier of the new base station (new cell) is notified to the new base station device or the existing base station device. By doing so, it is possible to automatically collect information on the propagation status of radio waves transmitted by the newly installed base station apparatus.

  In this case, the notification unit 110 notifies the reception quality of the pilot channel transmitted from the newly installed base station apparatus, as well as information on other base station apparatuses located around the newly installed base station apparatus, for example, cell IDs. Alternatively, in addition to the cell ID, the reception quality of a pilot channel transmitted from another base station apparatus, for example, SIR, reception level, path loss, etc. may be notified.

  Further, when the mobile station device 100 is in an idle state that is a standby state, the mobile station device 100 accesses and notifies a base station device that is in the area. In addition, when the mobile station device 100 is in an active state where communication is in progress, the mobile station device 100 is notified between data transmission and reception.

  By doing so, it is possible to automatically collect information on the propagation status of radio waves transmitted by the newly installed base station apparatus. In addition, information on other base station devices located around the newly installed base station device can also be collected.

  On the other hand, when determining that the pattern of the synchronization channel input by the cell search unit 102 does not match the pattern assigned to the base station apparatus in the pre-operation state, the control unit 104, based on the received synchronization channel, The transmission band of the broadcast channel is detected and input to the broadcast channel receiver 110.

  Broadcast channel receiving section 110 receives the broadcast channel based on the transmission band of the broadcast channel input by control section 104 and inputs broadcast information to control section 104.

  The control unit 104 instructs the reception quality measurement unit 106 to measure the reception quality of the pilot channel transmitted from the existing base station apparatus, for example, the SIR. The control unit 104 inputs the reception quality of the pilot channel transmitted from the existing base station apparatus measured by the reception quality measurement unit 106 to the cell selection unit 112. Based on the received reception quality, the cell selection unit 112 performs cell selection by comparing the received level with the cell in communication.

  Next, the operation of the base station apparatus 200 according to the present embodiment will be described with reference to FIG.

  The state setting unit 206 sets the pre-operation state when the own base station device is newly installed (step S402).

  Next, the synchronization channel creation unit 204 creates a synchronization channel configured by the pattern of the synchronization channel assigned to the newly installed base station apparatus in the pre-operation state (step S404).

  Next, the transmission RF unit 202 transmits a synchronization channel (step S406).

  Next, the operation of the mobile station apparatus 100 according to the present embodiment will be described with reference to FIG.

  The cell search unit 102 performs a cell search at a predetermined cycle, for example, every 200 ms (step S502).

Next, the cell search unit 102 determines whether or not a new cell has been detected (step S504).
When a new cell is not detected (step S504: NO), the process returns to step S502.

  On the other hand, when a new cell is detected (step S504: YES), the cell search unit 102 obtains the transmission timing of the base station apparatus by correlating with the chip sequence of the primary synchronization channel based on the received synchronization channel. , And the pattern of the secondary synchronization channel sequence is obtained based on the detected timing and input to the control unit 104.

  Control section 106 determines whether or not the secondary synchronization channel sequence pattern (synchronization channel pattern) input by cell search section 102 matches the pattern assigned to the newly installed base station apparatus in the pre-operation state. (Step S506). If it is determined that the pattern of the synchronization channel matches the pattern assigned to the base station apparatus in the pre-operation state (step S506: YES), the reception quality measurement unit 108 is transmitted from the newly installed base station apparatus that transmitted the synchronization channel. The pilot channel reception quality, for example, SIR is measured (step S508).

  Next, the notification unit 110 reports the reception quality measured by the reception unit 108 (step S510). Next, the process returns to step S502.

  On the other hand, when the pattern of the synchronization channel does not match the pattern assigned to the base station apparatus in the pre-operation state (step S506: NO), the broadcast channel receiving unit 110 detects the broadcast channel detected based on the synchronization channel. A broadcast channel is received based on the transmission band (step S512).

  Next, reception quality measurement section 108 measures the reception quality of the pilot channel transmitted from the existing base station apparatus (step S514).

  Next, the cell selection unit 112 performs cell selection based on the reception quality measured by the reception quality measurement unit 108 (step S516).

  According to the present embodiment, it is possible to automatically collect the propagation status of radio waves transmitted from a newly installed base station apparatus, so that the introduction of a new cell can be made efficient.

  In addition, since a synchronization channel including a pattern indicating that the pre-operation state is transmitted from the newly installed base station apparatus, the mobile station apparatus can detect the newly installed base station apparatus at the time of cell detection. In other words, it can be detected by information based on the physical layer.

  In addition, based on a pilot channel transmitted from another existing base station apparatus different from the newly installed base station apparatus, the cell ID of the other base station apparatus and / or reception of the pilot channel transmitted from the other base station apparatus is received. By notifying the quality, a list of neighboring cells can be created.

  Further, since the mobile station apparatus can detect that it is in the pre-operation state, it can prevent an error in waiting for or accessing the newly installed cell as a candidate for cell reselection.

  In this embodiment, the mobile station apparatus normally correlates with a chip sequence of the primary synchronization channel for a predetermined number of synchronization channel patterns allocated to the newly installed base station apparatus among a plurality of synchronization channel patterns. You may not take it. In this case, the mobile station device, when broadcast information indicating that a new base station device is introduced is transmitted from an existing base station device, for example, a base station device and / or a new base station device in the area, A predetermined number of synchronization channel patterns assigned to the newly installed base station apparatus may be correlated with the chip sequence of the primary synchronization channel. By doing so, the search time can be shortened.

  Next, a base station apparatus according to another embodiment of the present invention is described.

  The configuration of the base station apparatus according to the present embodiment is the same as that of the base station apparatus described with reference to FIG.

  In this embodiment, the scrambling code assigned to the newly installed base station apparatus in the pre-operation state is determined in advance. For example, when there are 512 scrambling codes, a predetermined number, for example, 100 of the 512 scrambling codes may be used as the scrambling code assigned to the newly installed base station apparatus.

  The base station apparatus 200 according to the present embodiment transmits a synchronization channel configured by a synchronization channel pattern corresponding to a scrambling code assigned in advance to the newly installed base station apparatus.

  Next, the mobile station apparatus 100 according to the present embodiment will be described.

  The configuration of the mobile station apparatus 100 according to the present embodiment is the same as that of the mobile station apparatus described with reference to FIG.

  In the mobile station apparatus 100 according to the present embodiment, when the synchronization channel transmitted by the base station apparatus 200 is received, the scrambling code is determined based on the pattern of the synchronization channel that configures the synchronization channel. It is determined whether or not the scrambling code matches the scrambling code assigned to the newly installed base station apparatus in the pre-operation state. When the mobile station apparatus 100 matches the scrambling code assigned to the newly installed base station apparatus in the pre-operation state, the mobile station apparatus 100 measures the reception quality of the pilot channel transmitted by the newly installed base station apparatus 200, for example, SIR, and Report.

  According to the present embodiment, it is possible to automatically collect the propagation status of radio waves transmitted from a newly installed base station apparatus, so that the introduction of a new cell can be made efficient.

  In addition, since the synchronization channel configured by the pattern of the synchronization channel corresponding to the scrambling code indicating the pre-operation state is transmitted from the newly installed base station device, the mobile station device is newly installed at the time of cell detection. Can be detected.

  In this embodiment, the mobile station apparatus may not normally search for a predetermined number of scrambling codes assigned to the newly installed base station apparatus among a plurality of scrambling codes. In this case, the mobile station device, when broadcast information indicating that a new base station device is introduced is transmitted from an existing base station device, for example, a base station device and / or a new base station device in the area, A predetermined number of scrambling codes assigned to the new base station apparatus may be searched. By doing so, the search time can be shortened.

  For example, when there are 512 scrambling codes, it always takes time to search for 512 codes. However, the system pre-determines that 1 to 100 of 512 codes are scrambling codes assigned to the newly installed base station apparatus. In this way, the mobile station apparatus normally searches 101 to 512, and when broadcast information indicating that the new base station apparatus is introduced is transmitted, 1 is assigned to the new base station apparatus. Search for ~ 100 scrambling codes.

  Further, the number of scrambling codes allocated to the newly installed base station apparatus is variable, and 1 to n (n is an integer where n> 0) is allocated to the newly installed base station apparatus among the total number of scrambling codes. A scrambling code may be used. In this case, n may be transmitted from the existing base station apparatus as information indicating the scrambling code assigned to the newly installed base station apparatus.

It is a partial block diagram which shows the base station apparatus which concerns on one Example of this invention. It is a partial block diagram which shows the mobile station apparatus which concerns on one Example of this invention. It is a flowchart which shows operation | movement of the base station apparatus which concerns on one Example of this invention. It is a flowchart which shows operation | movement of the mobile station apparatus based on one Example of this invention.

Explanation of symbols

100 Mobile station apparatus (UE: User Equipment)
102 cell search unit 104 control unit 106 reception quality measurement unit 108 notification unit 110 broadcast channel reception unit 112 cell selection unit 200 base station apparatus (eNB: eNodeB)
202 Transmission RF unit 204 Synchronization channel creation unit 206 State setting unit 300 Edge router (ER: Edge Router)
350 router (Router)
400 MME (Mobility Management Entity) / UPE (User Plane Entity) pool
500 OAM (Operation And Maintenance)
600 Home Location Register (HLR)
700 IASA (Inter Access System Anchor)

Claims (8)

A synchronization channel indicating a pre-operation state that is a state before the operation state is transmitted from the newly installed base station device,
Cell search means for receiving a synchronization channel;
New base station apparatus determination means for determining, based on the received synchronization channel, whether or not the base station apparatus that transmitted the synchronization channel is in a pre-operation state;
The newly If it is determined that pre-operation state by the base station apparatus determining means, receiving the pilot channel transmitted from the identifier and / or the newly established base station apparatus of the newly established base station (new cell) Notification means to notify the quality;
Equipped with a,
The said notification means is a mobile station apparatus which notifies the reception quality of the pilot channel transmitted from the identifier of the other base station apparatus (cell) different from the said newly installed base station apparatus, and the said other base station apparatus. In the mobile station apparatus according to claim 1,
The newly established base station apparatus transmits a synchronization channel configured by a synchronization channel pattern pre-assigned to the newly established base station apparatus,
The newly installed base station apparatus determining means determines whether or not a synchronization channel pattern pre-assigned to the newly installed base station apparatus is detected,
The notification unit, when the pattern of the pre-assigned synchronization channel to the base station apparatus to be the newly is judged to have been detected by the new base station determining means, the newly established base station apparatus ( A mobile station apparatus that notifies an identifier of a new cell) and / or reception quality of a pilot channel transmitted from the newly installed base station apparatus. In the mobile station apparatus according to claim 1,
The newly established base station apparatus transmits a synchronization channel configured by a synchronization channel pattern corresponding to a scrambling code assigned in advance to the newly established base station apparatus,
The cell search means specifies a scrambling code based on a synchronization channel pattern,
The newly installed base station apparatus determining means determines whether or not the scrambling code specified by the cell search means matches a scrambling code assigned in advance to the newly installed base station apparatus,
The notifying means determines that the scrambling code specified by the cell search means by the newly established base station apparatus determining means matches the scrambling code assigned in advance to the newly established base station apparatus, A mobile station apparatus that notifies an identifier of a newly installed base station apparatus (new cell) and / or a reception quality of a pilot channel transmitted from the newly installed base station apparatus. A group Chikyoku apparatus:
State setting means for setting the pre-operation state that is the state before the operation state;
Synchronization channel creation means for creating a synchronization channel indicating the pre-operation state when the state setting means sets the pre-operation state;
Transmitting means for transmitting the synchronization channel;
An identifier of the base station device in the pre-operation state and / or a reception quality of the pilot channel from the base station device in the pre-operation state from the mobile station device that has received the synchronization channel transmitted by the transmission means, Receiving means for receiving an identifier of another base station apparatus (cell) different from the base station apparatus in the operation state, and reception quality of a pilot channel transmitted from the other base station apparatus;
A base station apparatus comprising: In the base station apparatus according to claim 4 :
In the pre-operation state, although a service cannot be provided, a synchronization channel and a pilot channel can be transmitted. In the base station apparatus according to claim 4 or 5 ,
The synchronization channel generating unit, the base station apparatus characterized by creating a synchronization channel composed of a pre-allocated synchronization channel patterns of the base station apparatus to be newly. In the base station apparatus according to claim 4 or 5 ,
The synchronization channel generating unit, the base station apparatus characterized by creating a synchronization channel composed of a pre-allocated synchronization channel pattern that corresponds to the scrambling code to the base station apparatus is established. A transmission step in which a synchronization channel indicating a pre-operation state that is a state before the operation state is transmitted from the newly installed base station apparatus;
A cell search step in which the mobile station apparatus receives the synchronization channel;
A new base station apparatus determination step in which the mobile station apparatus determines, based on the received synchronization channel, whether or not the base station apparatus that has transmitted the synchronization channel is in a pre-operation state;
If the judged by a new base station determining step that the pre-operation state, send the mobile station apparatus, the identifier and / or the newly established base station apparatus of the newly established base station (new cell) A notification step of notifying reception quality of the pilot channel to be performed;
I have a,
Wherein in the notification step, propagation and notifies also the reception quality of a pilot channel to be transmitted the identifier of the other different base station apparatus and the newly established base station (cell) from the other base station apparatus Status collection method.

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