JP2007288753A - Channel identifier allocating method, peripheral information notifying method, base station and mobile device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a channel identifier allocating method, a peripheral information notifying method, a base station and a mobile device capable of applying much more time reduction or like processing to peripheral cell searching while maintaining a reduction effect of peripheral information to be notified from a sector of a base station to the mobile device in a mobile communication system. <P>SOLUTION: In the channel identifier allocating method, a channel identifier for identifying a sector is allocated to the sector of a cell formed by a base station of the mobile communication system. The available channel identifiers are classified into groups, each of which consists of m number of channel identifiers. The groups are allocated to the cells of the base stations, respectively, and in each group, the channel identifiers are allocated from a first sector to an m-th sector in numerical order. Then, the identifiers of the group allocated to other cells adjacent to the sectors captured by the mobile device, and the number of sectors included in other cells are notified as other peripheral information of the mobile device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a channel identifier assignment method, a peripheral information notification method, a base station, and a mobile station capable of reducing the peripheral information to be notified from the sector of the base station to the mobile station in the mobile communication system and reducing the time required for the peripheral cell search. Related to the machine.

  FIG. 1 is a diagram showing the concept of cells and sectors in a mobile communication system.

  In wireless communication, a radio wave transmitted from a transmission end propagates while attenuating space and reaches a reception end. Propagation loss has the property of increasing as the distance between transmission and reception points increases. Therefore, when the distance between transmission and reception points increases, transmission power needs to be increased in order to obtain required reception quality, and power consumption increases. Reduction of power consumption is important for long-lasting battery and economy of system.

  Therefore, in a mobile communication system such as a mobile phone that is currently popularized, a plurality of base stations 10 are installed in a service area, so that the area 30 is a cell 30 that is a relatively small wireless zone (shown as an ellipse in FIG. 1). The mobile device 20 communicates with the nearest base station 10 to reduce the distance between the transmission and reception points, thereby suppressing power consumption. In addition, by providing a plurality of directional antennas in one base station 10 and dividing the cell 30 into a plurality of sectors 40 (portions shown by sectors in FIG. 1), the efficiency is increased without increasing the number of base station installation locations. To compensate for propagation loss. At this time, it is important to select the best sector 40 in the mobile device 20 as the sector 40 for standby and communication.

  Here, the amount of attenuation in actual radio wave propagation varies greatly depending on the location because it is affected by the topography and other features in addition to the distance. Accordingly, as the mobile device 20 moves, the best sector 40 changes every moment. In such an environment, the mobile device 20 needs to search and capture peripheral sectors and monitor radio wave propagation conditions so that the best sector 40 can always be selected. This search operation of the mobile device 20 is called a neighbor cell search. In the mobile device 20, being able to monitor the propagation status of as many sectors 40 as possible is important in always selecting the optimum sector 40.

  The neighboring cell search is performed when the mobile station 20 searches for and receives the broadcast information channel transmitted from each sector 40. At this time, the broadcast information channel of each sector 40 has an identity for identifying each channel so that it can be determined from which sector 40 the broadcast information channel detected by the mobile device 20 is transmitted. Need arises. This identity is referred to as a “channel identifier”. A plurality of channel identifiers are prepared, a channel identifier is assigned to each sector 40, and a broadcast information channel characterized by the channel identifier is transmitted from each sector 40. The channel identifier can have a high affinity with the system, for example, a carrier frequency for the TDMA / FDMA system, a spreading code for the CDMA system, and the like.

  The mobile device 20 searches for a broadcast information channel that can be received in the neighboring cell search, and when a new broadcast information channel is detected, identifies the channel identifier of the broadcast information channel. As a result, the mobile station 20 can identify the sector 40, and determines the sector 40 that is waiting and performing communication from the quality of the received broadcast information channel.

  Here, when there is a sector 40 using the same channel identifier nearby, mutual influences such as erroneous recognition and erroneous detection of the sector 40 become a problem. If the sectors 40 to which the same channel identifier is assigned are sufficiently far away, the mutual influence can be suppressed to a sufficiently small level, and no problem occurs. Therefore, in a system in which the number of channel identifiers is smaller than the total number of sectors in the system and the same channel identifier needs to be repeatedly assigned to a plurality of sectors 40, it is necessary to pay close attention to the repetition interval. Here, if the number of channel identifiers is sufficiently large, repeated assignment becomes easy.

  However, as the number of channel identifiers increases, the number of candidates for channel identifier identification increases in the peripheral cell search, and the time required for the peripheral cell search increases. Therefore, from the viewpoint of speeding up the neighboring cell search, it is preferable that the number of channel identifiers is small.

  Here, even when the number of channel identifiers is large, the channel identifiers can be grouped in advance in order to perform a neighboring cell search at high speed. In a CDMA mobile communication system, Non-Patent Document 1 proposes a three-stage cell search technique as a technique for performing a neighboring cell search at a high speed when the number of channel identifiers, that is, a spread code is large. According to this technique, channel identifiers are grouped in advance, and when a mobile station performs a neighbor cell search, first the timing of the broadcast information channel is detected, and then the group of channel identifiers is identified. Finally, by identifying channel identifiers belonging to the group, sectors can be identified more quickly.

  Performing the peripheral cell search at high speed is important in two respects: adapting to the state of propagation that changes with movement, and reducing power consumption required for the search. Even in the case of FDMA / TDMA, if carrier frequencies are grouped in advance, the frequency band to be swept during the peripheral cell search is limited, and the peripheral cell search can be speeded up.

  By the way, in each sector, information on the peripheral sector of the sector is notified to the mobile device through the broadcast information channel, and when the mobile device performs a peripheral cell search based on this information, the options for identifying the channel identifier are reduced. Neighbor cell search can be completed at high speed. The mobile device can receive information on peripheral sectors from the sector in communication and the already captured sector. At this time, if the amount of information to be notified is large, the transmission power increases and the power required for decoding by the mobile device also increases, which is not efficient. It is important to increase the accuracy of the peripheral cell search with less information.

  In such a mobile communication system, if the number of channel identifiers is increased from a request for repeated assignment of channel identifiers, the number of channel identifier candidates in the neighboring cell search increases, and thus the time required for neighboring cell search increases. . When the time required for the peripheral cell search increases, there arises a problem that the power consumption of the search increases, and a serious problem that it is impossible to select the best sector because it cannot cope with the changing propagation situation.

  Furthermore, if the best sector cannot be selected, the required transmission power increases, so that there are problems that interference to other users increases and power consumption increases.

  Furthermore, the mobile station receives information indicating which channel identifier is normally used in the neighboring sectors from the sector where the mobile station is located, and performs a cell search based on this information. Since the channel identifiers of all the peripheral sectors are notified, there is a problem that power consumption increases and becomes inefficient.

  Furthermore, when the same channel identifier is repeatedly assigned to a plurality of sectors, it is necessary to pay attention to the repetition interval for each channel identifier, which causes a problem that the design and management become complicated.

In order to solve such a problem, the present inventors have already proposed a channel identifier assignment method and a mobile communication system as shown in Patent Document 1. There, channel identifiers belonging to the same group are assigned to sectors in the same base station, and any one of channel identifiers assigned to the sector for one neighboring base station from a base station to a mobile station located in the area. By notifying one, the power consumption and time required for the mobile station to search for neighboring cells are kept small, and the design and management complexity is reduced.
JP 2001-119745 A Higuchi, Sawahashi, Adachi, "Fast CellSearch Algorithm in Inter-Cell Asynchronous DS-CDMA Mobile Radio," IEICE Trans. Commun., Vol. E81-B, No. 7, July 1998

  The technique disclosed in Patent Document 1 described above has advantages such as reducing the time required for neighboring cell search and power consumption by reducing the amount of broadcast information, but the channel allocated to the sector for one neighboring base station Since only one of the identifiers is notified, there is a problem that an unnecessary sector is searched when cells having different numbers of sectors are adjacent to each other. For example, when a cell with 6 sectors and a cell with 3 sectors are mixed, the mobile station searches for adjacent sectors in the cell based on the notified channel identifier of the sector. In spite of this, the other three sectors allocated in the design are also searched, and there is a problem that the time and power consumption corresponding to that are wasted.

  For example, in a future mobile communication system, a higher transmission rate is required, and therefore a higher frequency is expected to be used. Since the propagation attenuation increases at higher frequencies, it is necessary to reduce the cell radius in design. Therefore, the number of cells is expected to increase. In addition, since the propagation attenuation amount increases, there is a possibility that the number of radio wave dead areas that cannot be covered by a normal cell may increase, and it is necessary to cover these with a spot cell such as an overhang cell. In order to efficiently construct a system when the number of cells increases in this way, it is conceivable to actively aggregate a plurality of cells into one base station apparatus using antenna extension. Since the aggregated cells are subordinate to the same base station, they can be handled in the same manner as conventional sectors. From such a situation, the number of sectors managed by one base station tends to increase more than before. Therefore, when Patent Document 1 is applied, it is necessary to increase the number of identifiers in the group. However, if a group is assigned to a cell with a small number of sectors when there are many identifiers in the group, the probability of searching for an unnecessary sector increases. In addition, due to problems such as base station installation space, it may be possible to aggressively consolidate overhanging cells in a station where a large amount of installation space can be secured, and cells concentrated in the same base station do not necessarily constitute a continuous area. In some cases. In such a case, it is not always necessary to search for identifiers belonging to the same group.

  The present invention has been proposed in view of the above-described conventional problems, and the object of the present invention is to maintain the effect of reducing the peripheral information to be notified to the mobile station from the sector of the base station in the mobile communication system, It is an object of the present invention to provide a channel identifier assignment method, a peripheral information notification method, a base station, and a mobile device that can further reduce the time for searching for neighboring cells.

  In order to solve the above problems, according to the present invention, as described in claim 1, a channel identifier for identifying the sector is assigned to a sector of a cell formed by a base station of a mobile communication system. In this method, the available channel identifiers are grouped into m numbers in order of numbers, and groups are assigned to the cells of each base station. Within each group, the channel identifiers are numbered from sector 1 to sector m in order of numbers. The gist of the channel identifier allocation method is as follows.

  In addition, as described in claim 2, a method of informing peripheral information from a base station to a mobile device that has captured a sector of a cell formed by a base station of a mobile communication system, which can be used On the assumption that channel identifiers are grouped into m numbers in the order of numbers and groups are assigned to cells of each base station, and the channel identifiers are assigned from the first sector to the mth sector in the order of numbers within each group. The gist of the peripheral information notification method is to notify the identifier of a group assigned to another cell adjacent to the sector captured by the mobile station and the number of sectors included in the other cell as peripheral information for the mobile station.

  In addition, as described in claim 3, a method for informing peripheral information from a base station to a mobile device that has captured a sector of a cell formed by a base station of a mobile communication system, which can be used On the assumption that channel identifiers are grouped into m numbers in the order of numbers and groups are assigned to cells of each base station, and the channel identifiers are assigned from the first sector to the mth sector in the order of numbers within each group. Peripheral information that broadcasts the identifier of the channel identifier assigned to the sector of the adjacent cell where frequent handover occurs and the number of sectors included in the other cell as the peripheral information for the mobile device The gist is the information reporting method.

  In addition, according to a fourth aspect of the present invention, there is provided a method for informing peripheral information from a base station to a mobile device that has captured a cell sector formed by a base station of a mobile communication system. On the assumption that the same combination of channel identifiers is assigned to the sector of the cell, the identifier assigned to the other cell adjacent to the sector captured by the mobile station, and the number of sectors included in the other cell, The gist of the peripheral information notification method is to notify the mobile device as peripheral information.

  Further, according to claim 5, there is provided a method for informing peripheral information from a base station to a mobile device that has captured a sector of a cell formed by a base station of a mobile communication system, On the assumption that the same combination of channel identifiers is assigned to the sector of the cell, the identifier assigned to the other cell adjacent to the sector captured by the mobile station, and the sector captured by the mobile station The gist of the peripheral information notification method is to report the identifier of the channel identifier assigned to the sector of the other adjacent cell that occurs and the number of sectors included in the other cell as peripheral information for the mobile device.

  In addition, as described in claim 6, a base station constituting a mobile communication system, wherein one group obtained by grouping available channel identifiers in order of m is assigned to a cell of the base station The gist of the present invention is a base station comprising means and means for assigning the channel identifier from the first sector to the m-th sector in numerical order within the group.

  Further, as described in claim 7, in the base station according to claim 6, the mobile station that has captured the sector of the cell formed by the base station is adjacent to the sector captured by the mobile station. Means can be provided for notifying the identifier of the group allocated to another cell and the number of sectors included in the other cell as peripheral information.

  Further, as described in claim 8, in the base station according to claim 6, the mobile station that has captured the sector of the cell formed by the base station is frequently compared with the sector that the mobile station has captured. Means can be provided for notifying, as peripheral information, the identifier of the channel identifier assigned to the sector of another cell adjacent to which handover occurs and the number of sectors included in the other cell.

  In addition, as described in claim 9, a base station constituting a mobile communication system is formed by the base station on the assumption that the same combination of channel identifiers is allocated to the cell sectors of each base station. For notifying a mobile station that has captured a sector of a cell to be used as peripheral information of an identifier assigned to another cell adjacent to the sector captured by the mobile station and the number of sectors included in the other cell The base station provided with

  In addition, as described in claim 10, a base station that constitutes a mobile communication system, and is formed by the base station on the assumption that the same combination of channel identifiers is allocated to the cell sectors of each base station. To the mobile station that has captured the sector of the selected cell, an identifier assigned to another cell adjacent to the sector that the mobile station has captured, and another adjacent area that frequently undergoes handover with the sector that the mobile station has captured. The gist of the present invention is a base station provided with means for reporting, as peripheral information, the identifier of the channel identifier assigned to the sector of the cell and the number of sectors included in the other cell.

  In addition, as described in claim 11, it is a mobile device used in a mobile communication system, and groups available channel identifiers into groups of m in order of numbers and assigns groups to cells of each base station. On the premise that the channel identifiers are assigned from the first sector to the m-th sector in numerical order in each group, the identifiers of the groups assigned to other cells adjacent to the sector captured by the mobile station, and the other A mobile unit comprising: means for receiving the number of sectors included in the cell as peripheral information from the base station of the captured sector; and means for performing a peripheral cell search by narrowing down the target based on the identifier of the group and the number of sectors. It is a summary.

  A mobile device used in a mobile communication system according to claim 12, wherein available channel identifiers are grouped into m numbers in order of numbers, and groups are assigned to cells of each base station. In each group, on the assumption that the channel identifiers are assigned from the first sector to the m-th sector in numerical order, they are assigned to sectors captured by the mobile station and sectors of adjacent cells where frequent handover occurs. Means for receiving the identifier of the channel identifier and the number of sectors included in the other cell as peripheral information from the base station of the captured sector, and searching for neighboring cells based on the identifier of the channel identifier and the number of sectors. The gist of the present invention is a mobile device comprising means for performing the above.

  Further, according to a thirteenth aspect of the present invention, there is provided a mobile device used in a mobile communication system, on the premise that the same combination of channel identifiers is assigned to a cell sector of each base station. Means for receiving, as peripheral information, an identifier assigned to another cell adjacent to the captured sector and the number of sectors included in the other cell from the base station of the captured sector; an identifier of the cell and the number of sectors The gist of the present invention is a mobile device provided with a means for performing a peripheral cell search by focusing on a target.

  In addition, as described in claim 14, a mobile device used in a mobile communication system, on the premise that the same combination of channel identifiers is assigned to a sector of a cell of each base station, the mobile device An identifier assigned to another cell adjacent to the captured sector, an identifier of a channel identifier assigned to a sector captured by the mobile station and a sector of another adjacent cell that frequently undergoes handover, and the other cell Means for receiving the number of sectors included in the base station as peripheral information from the base station of the captured sector, and means for performing a peripheral cell search by narrowing down the target based on the identifier of the cell, the identifier of the channel identifier, and the number of sectors. The gist is mobile equipment.

  In addition, as described in claim 15, in the mobile device according to any one of claims 11 to 14, when no broadcast information is received from the sector of the base station, Means may be provided for starting the search from the first channel identifier of the group or cell and sequentially searching for the next rank channel identifier in each group or cell on the mapping until the channel identifier is captured. .

  Further, the above-mentioned problems of the present invention are a channel identifier assignment method, a peripheral information notification method, and a control device for assigning a channel identifier to a ramp area composed of at least one adjacent sector instead of a cell formed by a base station. It can also be solved by a mobile device.

  According to an embodiment of the present invention, an efficient neighboring cell search based on the number of sectors included in broadcast information while maintaining the effect of reducing the peripheral information broadcast from the base station sector to the mobile station in the mobile communication system. The time and power consumption required for the peripheral cell search can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described.

<First Embodiment>
FIG. 2 is a diagram showing an example of a channel identifier assignment method according to an embodiment of the present invention, and pays attention only to three adjacent cells among a plurality of cells constituting the mobile communication system.

  In FIG. 2, a base station 10 is arranged at the center of each cell shown in a turtle shell shape, and each cell is divided into six sectors. The number of sectors shown in the figure is merely an example, and the number of sectors can be different for each cell.

  Here, the channel identifier assignment method of the present embodiment is executed by the following procedure.

(1) The available channel identifiers are grouped into m pieces in numerical order, and groups are assigned to the cells of each base station. That is, when the group identifier is represented by G and the channel identifier identifier is represented by C,
G ₀ = {C ₁ , C ₂ ,... C _m }
G ₁ = {C _{m + 1} , C _{m + 2} ,... C _{m + m} }
・
・
G _i = {C _{mi + 1} , C _{mi + 2} ,... C _{mi + m} }
・
・
And then, it assigns an identifier G _i of groups to the cell of each base station.

(2) Allocate the channel identifier from the first sector to the m-th sector in numerical order within each group. That is,
Group G ₀ : C ₁ → sector 1, C ₂ → sector 2,...
Group G ₁ : C _{m + 1} → sector 1, C _{m + 2} → sector 2,...
・
・
Group G _i : C _{mi + 1} → sector 1, C _{mi + 2} → sector 2,...
・
・
And Even when the number of sectors actually provided in each base station is exceeded, channel identifiers are assigned by design.

  FIG. 2 shows a case where m = 10 and the number of sectors in each cell is 6. However, the value of m and the number of sectors in each cell are not limited thereto.

<First Embodiment: Part 1>
FIG. 3 is a diagram illustrating an example of broadcast information transmitted from the sector of the base station to the mobile device 20. In this example, the group identifiers (G ₀ , G ₂₎ assigned to other cells adjacent to the sector captured by the mobile device 20 on the assumption that the group and channel identifiers described in FIG. 2 have been assigned. ) And the number of sectors included in the other cell (both M = 6) are reported as peripheral information (SIB: System Information Block) for the mobile device 20.

The mobile device 20 that has received the broadcast information can perform a neighboring cell search by narrowing down the target based on the group identifier and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. That is, the mobile device 20 recognizes from “G ₀ , M = 6, G ₂ , M = 6” that the group G ₀ with 6 sectors and the group G ₂ with 6 sectors are in the vicinity. _The search is performed by focusing on the channel identifiers corresponding to the identifiers C _{1 to} C ₆ for ₀ and the channel identifiers corresponding to the identifiers C _{21 to} C ₂₆ for the group G ₂ , thereby performing processing in a short time. Can do. Further, since the channel identifiers are assigned in numerical order, for example, when a channel identifier corresponding to the identifier C ₃ of the group G ₀ is received, the channel identifiers corresponding to the identifiers C ₂ and C ₄ are located on both sides of the channel identifier. Can be easily grasped, and a search can be preferentially performed.

In addition, since the group and channel identifiers as described in FIG. 2 are assigned, it is necessary to search for many channel identifiers one by one from the beginning when the mobile device 20 has not received any broadcast information. However, it is possible to perform processing at high speed by searching in groups. More specifically, in a state where the mobile device 20 has not received any broadcast information, channel identifiers C ₁ , C ₁₁ , C ₂₁ ,... Corresponding to the first identifier of the group assigned to each cell. The search may be started sequentially, and then the search may be sequentially performed as C ₂ , C ₁₂ , C ₂₂ ,.

<First Embodiment: Part 2>
FIG. 4 is a diagram illustrating another example of the notification information transmitted to the mobile device 20. In this example, on the assumption that the group and channel identifiers described in FIG. 2 have been assigned, the channel identifiers assigned to sectors captured by the mobile device 20 and sectors of other adjacent cells where frequent handovers frequently occur. The identifier (C ₃ , C ₂₂ ) and the number of sectors included in the other cell (both M = 6) are reported as peripheral information (SIB) for the mobile device 20.

The mobile device 20 that has received this broadcast information can perform a neighbor cell search by narrowing down the target based on the identifier of the channel identifier and the number of sectors, thereby reducing the time and power consumption required for the neighbor cell search. That is, the mobile station 20 starts from “C ₃ , M = 6, C ₂₂ , M = 6” so that the sector corresponding to the identifier C ₃ of the group G ₀ with 6 sectors faces itself and the group with 6 sectors. It recognizes that the sector corresponding to the identifier _{C 22} of G ₂ is facing him, in order of the channel identifier corresponding to the identifier _{C 3, C 2, C 4} ··· for group _{G 0,} the group _{G 2} Can be processed in a short time by performing a search by assigning priorities to the channel identifiers corresponding to the identifiers C ₂₂ , C ₂₁ , C ₂₃ .

Further, in a state in which the mobile device 20 has not received any broadcast information, a search is performed from channel identifiers C ₁ , C ₁₁ , C ₂₁ ,... Corresponding to the first identifier of the group assigned to each cell. The search is performed sequentially, starting with C ₂ , C ₁₂ , C ₂₂ ,. Thereby, initial search can be performed at high speed.

<First Embodiment: Part 3>
FIG. 5 is a diagram showing an example in which channel identifiers of the same combination are allocated, and channel identifier allocation assumed in S3G (Super 3 Generation) or LTE (Long Term Evolution) being developed as a next generation communication method It is an example. That is, a unique scrambling code is assigned to each cell of the base station, and its identifier (for convenience, described as “cell identifier”) is added, but a short code such as an orthogonal pilot pattern is assigned to a sector in each cell. Are assigned in the same combination. In the figure, G ₀ , G ₁ ,... Are shown as cell identifiers, but in this example, there is no meaning to group channel identifiers.

FIG. 6 is a diagram illustrating another example of the notification information transmitted to the mobile device 20. In this example, the cell identifiers (G ₀ , G ₂₎ assigned to other cells adjacent to the sector captured by the mobile device 20 on the assumption that the cell and channel identifiers described in FIG. 5 are assigned. ) And the number of sectors included in the other cell (both M = 6) are reported as peripheral information (SIB) for the mobile device 20.

The mobile device 20 that has received the broadcast information can perform a neighboring cell search by narrowing down the target based on the cell identifier and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. That is, the mobile station 20 recognizes that the cell G ₀ with 6 sectors and the cell G ₂ with 6 sectors are in the vicinity from “G ₀ , M = 6, G ₂ , M = 6”. a channel identifier corresponding to the identifier C ₁ -C ₆ for _0, by performing a search by targeted to a channel identifier corresponding to the identifier C ₁ -C ₆ for cell G _2, performing the processing short time Can do. Further, since the channel identifiers are assigned in numerical order, for example, when a channel identifier corresponding to the identifier C ₃ of the cell G ₀ is received, the channel identifiers corresponding to the identifiers C ₂ and C ₄ are located on both sides of the channel identifier. Can be easily grasped, and a search can be preferentially performed.

In a state where nothing mobile 20 does not receive the broadcast information, search and so C ₁ · · · of C ₁ → G ₁ of G ₀ from the channel identifier corresponding to the beginning of the identifier for each cell the start, followed by performing a sequential search and so on _C 2 ··· of _{C 2} → _{G 1} of _{G 0.} Thereby, initial search can be performed at high speed.

<First Embodiment: Part 4>
FIG. 7 is a diagram showing another example of the notification information transmitted to the mobile device 20. In this example, the cell identifiers (G ₀ , G ₂₎ assigned to other cells adjacent to the sector captured by the mobile device 20 on the assumption that the cell and channel identifiers described in FIG. 5 are assigned. ), The identifier (C ₃ , C ₂ ) of the channel identifier assigned to the sector captured by the mobile station 20 and the sector of another cell adjacent to which frequent handover frequently occurs, and the number of sectors included in the other cell ( In either case, M = 6) is reported as the peripheral information (SIB) for the mobile device 20.

The mobile station 20 that has received the broadcast information can perform a neighboring cell search based on a cell identifier, a channel identifier identifier, and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. it can. That is, the mobile station 20 is directed from “G ₀ , C ₃ , M = 6, G ₀ , C ₂ , M = 6” to the sector corresponding to the identifier C ₃ of the cell G ₀ with 6 sectors, recognizes that the sector number of sectors corresponding to the identifier _{C 2} cells _{G 2} of 6 faces his, the cell _{G 0} is the identifier _{C 3,} C _{2, C} 4 channel identifier corresponding to ... The cell G ₂ can be processed in a short time by performing a search by assigning priorities to the channel identifiers corresponding to the identifiers C ₂ , C ₁ , C ₃ .

In a state where nothing mobile 20 does not receive the broadcast information, search and so C ₁ · · · of C ₁ → G ₁ of G ₀ from the channel identifier corresponding to the beginning of the identifier for each cell the start, followed by performing a sequential search and so on _C 2 ··· of _{C 2} → _{G 1} of _{G 0.} Thereby, initial search can be performed at high speed.

<First Embodiment: Configuration Example of Base Station>
FIG. 8 is a diagram illustrating a configuration example of the base station 10 according to the embodiment of the present invention, and conceptually illustrates only a portion related to the present invention in the configuration of the base station 10.

  8, the base station 10 includes at least a user interface 102, a broadcast information setting control unit 104, a channel identifier setting control unit 106, a broadcast information storage unit 108, a channel identifier generation unit 110, a broadcast information channel information configuration unit 112, and a modulation unit. 114, a multiplexing unit 116, an amplification unit 118, an antenna 120, another channel signal processing unit 122, and a network interface 124.

  The user interface 102 is connected to the broadcast information setting control unit 104 and the channel identifier setting control unit 106 and has a man-machine interface function between the operator and the base station 10. The broadcast information setting control unit 104 is connected to the broadcast information storage unit 108 corresponding to each sector, and has a function of controlling the setting of broadcast information for each sector. Here, the “broadcast information” is information for the base station to broadcast to mobile stations located in each sector based on the method described in FIG. 3, FIG. 4, FIG. 6, and FIG. . The channel identifier setting control unit 106 is connected to the channel identifier generation unit 110 corresponding to each sector, selects and sets a channel identifier number assigned to each sector input via the user interface 102 from a group (cell), It has a function of controlling the channel identifier generator 110. The broadcast information storage unit 108 has a function of storing broadcast information set by the broadcast information setting control unit 104 for each sector, and transmitting broadcast information corresponding to each sector to the broadcast information channel information configuration unit 112. The channel identifier generation unit 110 has a function of generating a channel identifier corresponding to each sector and transmitting the channel identifier to the modulation unit 114. Here, the “channel identifier” may be, for example, a carrier frequency in the case of the TDMA / FDMA system, or may be, for example, a spreading code in the case of the CDMA system. Broadcast information channel information configuration section 112 has a function of configuring broadcast information channel information based on broadcast information received from broadcast information storage section 108 and transmitting the broadcast information channel information to modulation section 114. Modulation section 114 has a function of inputting and modulating the broadcast information channel information configured in broadcast information channel information configuration section 112 and the channel identifier generated by channel identifier generation section 110. For example, when the channel identifier is a spreading code, the broadcast information channel signal is spread-modulated with the spreading code that is the channel identifier, and when the channel identifier is the carrier frequency, Modulate the carrier wave. The multiplexing unit 116 has a function of multiplexing the signal modulated by the modulation unit 114 and the other channel signal processed by the other channel signal processing unit 122. The amplifying unit 118 is connected to the antenna 120 and has a function of amplifying a signal. The antenna 120 has a function of performing communication with the mobile device 20. The other channel signal processing unit 122 is connected to the network interface 124 and has a function of processing other channel signals and transmitting them to the multiplexing unit 116. The network interface 124 has an interface function for connection to a host network.

  Next, an example of the operation of the base station 10 configured as described above will be described below.

  First, a channel identifier to be assigned to each sector by the operator via the user interface 102 is selected from the group and set for each sector. The setting contents follow the method shown in FIG. 2 or FIG. This setting may be performed automatically.

  Next, the channel identifier setting control unit 106 notifies the channel identifier generation unit 110 of each sector which number of the identifier is generated, and the channel identifier generation unit 110 generates a channel identifier corresponding to this number. .

  Next, broadcast information such as the group number, channel identifier number, number of sectors, etc. of neighboring cells stored in the broadcast information storage unit 108 for each sector is set in the broadcast information setting control unit 104 via the user interface 102. The broadcast information channel information of each sector that is included is characterized by a channel identifier in modulation section 114.

  Next, the signal is multiplexed with the other channel signal by multiplexing section 116 and transmitted from antenna 120 to the mobile station after amplification by amplification section 118.

  In the present embodiment, the broadcast information is configured such that the user sets the group number, channel identifier number, number of sectors, and the like of neighboring cells for each sector or each base station via the user interface 102. However, even if the user does not set the broadcast information, the statistical results of the peripheral sectors with the most mobile stations handed over from their own sector are received via the network, and the channel identifier numbers of these peripheral sectors are automatically broadcast. The information may be set in each sector.

<First Embodiment: Configuration Example of Mobile Device>
FIG. 9 is a diagram showing a configuration example of the mobile device 20 according to the embodiment of the present invention, and conceptually shows only a part related to the present invention in the configuration of the mobile device 20.

  In FIG. 9, the mobile device 20 includes at least an antenna 202, a radio reception unit 204, a channel identifier search unit 206, a control unit 210, and a memory unit 212.

  The antenna 202 is connected to the channel identifier search unit 206 and the radio reception unit 204 and has a function of receiving radio waves transmitted from the base station 10. The channel identifier search unit 206 is connected to the antenna 202, the control unit 210, and the radio reception unit 204, has a function of searching for a channel identifier from a signal received via the antenna 202, and controls the captured channel identifier. 210 and a function of reporting to the wireless reception unit 204. The radio reception unit 204 decodes broadcast information from the sector using the channel identifier from the signal received via the antenna 202 using the reported channel identifier, and decodes the decoded group of peripheral sectors and channel identifier. And a function of reporting the number of sectors and the like to the control unit 210. The control unit 210 is connected to the channel identifier search unit 206, the radio reception unit 204, and the memory unit 212, and records the captured channel identifier and the channel identifiers of peripheral sectors in the memory unit 212, and then searches for them. A function to control the channel identifier search unit 206 to preferentially search for the channel identifier by selecting a channel identifier to be selected. The memory unit 212 is connected to the control unit 210 and has a memory function of storing a captured channel identifier, a group of peripheral sectors based on broadcast information received from the base station 10, a channel identifier, the number of sectors, and the like.

  Next, the operation of the mobile device 20 configured as described above will be described below.

  First, when the channel identifier search unit 206 newly captures a channel identifier from the received signal, the control unit 210 registers the channel identifier of the sector in the memory unit 212 as a captured channel identifier.

  Next, the channel identifier search unit 206 reports the channel identifier of the sector to the radio reception unit 204.

  Next, the radio reception unit 204 decodes the broadcast information from the sector using the captured channel identifier in the channel identifier from the signal received via the antenna 202, and reports the result to the control unit 210. .

  Next, the control unit 210 registers the broadcast information, that is, a group of peripheral sectors, a channel identifier, the number of sectors, and the like in the memory unit 212.

  Next, the control unit 210 uses the channel identifier reported from the channel identifier search unit 206 and the group of neighboring sectors, the channel identifier, the number of sectors, etc. reported from the radio reception unit 204 to determine whether there is a possibility of capturing in the future. Preselect high channel identifier.

  Next, the control unit 210 controls the channel identifier search unit 206 to preferentially search for a channel identifier that is likely to be captured in the future. As a result, when the mobile device 20 performs a neighbor cell search, the groups to be searched by the mobile device 20 are limited, and therefore the time required for the neighbor cell search is shortened and power consumption is reduced. It is done. In addition, since the other sectors of the base station 10 to which the captured sector belongs are powerful connection switching destination candidates from the geographical position relationship, the mobile device 20 waits for communication with these sectors and can be efficiently captured. The accuracy in selecting the optimum sector at all times as the sector to be performed is improved.

Second Embodiment
FIG. 10 is a diagram showing an example of a channel identifier assigning method according to an embodiment of the present invention, and shows a case where a child cell called an overhang cell exists in a cell constituting the mobile communication system. An overhang cell is a cell (or sector) configured by extending an antenna from a base station using an optical fiber or the like to a portion where traffic is concentrated or a dead zone where radio waves are difficult to reach. A cell composed of an antenna installed in the base station itself corresponding to the child cell is called a parent cell. In FIG. 10, the child cell is composed of one sector, but may be composed of a plurality of sectors.

When the child cell is far from the parent cell as shown in FIG. 10, both the child cell and its parent cell are not necessarily handover candidates. Upon detecting a channel identifier C ₇ of mobile 20 child cell, it is not necessary to detect the channel identifier C ₁ -C ₆ of the parent cell. Similarly, when the mobile device 20 detects the channel identifiers C _{1 to} C ₆ of the parent cell, it is not necessary to detect the channel identifier C ₇ of the child cell.

Therefore, a channel identifier assigning method in which the same cell identifier as the parent cell is assigned to the child cell and “G ₀ , C ₇ ” is assigned, and an identifier of a cell different from the parent cell is assigned to the child cell and “G ₃ , C ₃₁ ” is assigned. A channel identifier assignment method can be considered. Using any one of these channel identifier allocation methods, the broadcast information in FIGS. 3, 4, 6, and 7 needs to be changed as follows.

Second Embodiment: Part 1
In the example of the broadcast information shown in FIG. 3, since the group identifier and the number of sectors are broadcast to the mobile device 20, if the same group identifier is assigned to the parent cell and the child cell, it is not necessary to detect the channel identifier. Will be detected. Thus, assigning identifiers G ₃ of another group in the child cell. Furthermore, since the channel identifier of the child cell must be assigned in numerical order within the group, the channel identifier of the child cell is C ₃₁ instead of C ₇ .

FIG. 11 is a diagram illustrating an example of broadcast information transmitted from the sector of the base station to the mobile device 20. In this example, the identifier (G ₃ , G ₂ ) of the group assigned to another cell adjacent to the sector captured by the mobile device 20 and the number of sectors (M = 1, M = 6) included in the other cell. ) As peripheral information (SIB: System Information Block) for the mobile device 20.

The mobile device 20 that has received the broadcast information can perform a neighboring cell search by narrowing down the target based on the group identifier and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. That is, the mobile device 20 recognizes from “G ₃ , M = 1, G ₂ , M = 6” that there is a group G ₃ with 1 sector and a group G ₂ with 6 sectors in the vicinity. a channel identifier corresponding to the identifier C ₃₁ for _3, for the group G ₂ is by performing a search by targeted to a channel identifier corresponding to the identifier C ₂₁ -C _26, it can be processed short time. Because it is assigned an identifier G ₀ of the parent cell of another and child cell group, without having to detect a channel identifier of a parent cell, it is not necessary to detect the channel identifier that do not handover candidate.

Second Embodiment: Part 2
In the example of the broadcast information shown in FIG. 4, since the channel identifier and the number of sectors are broadcast to the mobile device 20, detection is performed when the total number of sectors including the number of sectors in the parent cell and the number of sectors in the child cell is broadcast. Even channel identifiers that are not necessary will be detected. Therefore, the number of sectors broadcast together with the channel identifier of the parent cell is the number of sectors of the parent cell, and the number of sectors broadcast together with the channel identifier of the child cell is the number of sectors of the child cell.

FIG. 12 is a diagram showing another example of the notification information transmitted to the mobile device 20. In this example, channel identifier identifiers (C ₇ , C ₂₂ ) assigned to sectors captured by the mobile device 20 and sectors of adjacent cells that frequently undergo handover, and the number of sectors included in the other cells. (M = 1, M = 6) is reported as peripheral information (SIB) for the mobile device 20.

The mobile device 20 that has received this broadcast information can perform a neighbor cell search by narrowing down the target based on the identifier of the channel identifier and the number of sectors, thereby reducing the time and power consumption required for the neighbor cell search. That is, the mobile station 20 starts from “C ₇ , M = 1, C ₂₂ , M = 6”, the sector corresponding to the identifier C ₇ of the group G _{0 with} the number of sectors 1 faces itself, and the group with the number of sectors 6 recognizes that the sector corresponding to the identifier C ₂₂ of G ₂ is facing yourself, performs search is targeted to a channel identifier corresponding to the identifier C ₇ for group G _0, the identifier C for group G ₂ It is possible to perform processing in a short time by performing a search by assigning priorities in the order of channel identifiers corresponding to ₂₂ , C ₂₁ , C ₂₃ . Since the number of sectors of the child cell does not include the number of sectors of the parent cell, it is not necessary to detect the channel identifier of the parent cell, and it is not necessary to detect a channel identifier that is not a candidate for handover.

Second Embodiment: Part 3
In the example of the broadcast information shown in FIG. 6, since the cell identifier and the number of sectors are broadcast to the mobile station 20, if the same cell identifier is assigned to the parent cell and the child cell, a channel identifier that does not need to be detected. Will be detected. Thus, assigning identifiers G ₃ of another cell to the child cell. Furthermore, since the channel identifier of the child cell must be assigned in numerical order within the cell, the channel identifier of the child cell is C ₁ instead of C ₇ .

FIG. 13 is a diagram illustrating another example of notification information transmitted to the mobile device 20. In this example, cell identifiers (G ₃ , G ₂ ) assigned to other cells adjacent to the sector captured by the mobile device 20 and the number of sectors included in the other cell (M = 1, M = 6). ) As peripheral information (SIB) for the mobile device 20.

The mobile device 20 that has received the broadcast information can perform a neighboring cell search by narrowing down the target based on the cell identifier and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. That is, the mobile device 20 recognizes that the cell _{G 2} of _{"G 3, M = 1, G} 2, M = 6 " number of sectors from the number of sectors and the cell _{G 3} 1 6 is in the neighborhood, the cell G a channel identifier corresponding to the identifier C ₁ for _3, for the cell G ₂ is that by targeted to a channel identifier corresponding to the identifier C ₁ -C ₆ performs a search, it is possible to perform processing short time. Since the parent cell is assigned the identifier G ₀ of a cell different from that of the child cell, it is not necessary to detect the channel identifier of the parent cell, and it is not necessary to detect a channel identifier that is not a candidate for handover.

Second Embodiment: Part 4
In the example of the broadcast information shown in FIG. 7, since the mobile device 20 is notified of the cell identifier, the channel identifier, and the number of sectors, the total number of sectors of the parent cell and the number of sectors of the child cell is broadcast. Then, even channel identifiers that do not need to be detected are detected. Therefore, the number of sectors broadcast together with the channel identifier of the parent cell is the number of sectors of the parent cell, and the number of sectors broadcast together with the channel identifier of the child cell is the number of sectors of the child cell.

FIG. 14 is a diagram showing another example of notification information transmitted to the mobile device 20. In this example, cell identifiers (G ₀ , G ₂ ) assigned to other cells adjacent to the sector captured by the mobile station 20 and other sectors that are frequently handed over to the sector captured by the mobile station 20. The channel identifier identifier (C ₇ , C ₂ ) assigned to the sector of the cell and the number of sectors (M = 1, M = 6) included in the other cell are used as peripheral information (SIB) for the mobile device 20. As a notification.

The mobile station 20 that has received the broadcast information can perform a neighboring cell search based on a cell identifier, a channel identifier identifier, and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. it can. That is, the mobile station 20 has the sector corresponding to the identifier C ₇ of the cell G ₀ having the number of sectors of “G ₀ , C ₇ , M = 1, G ₂ , C ₂ , M = 6” facing itself, It recognizes that the sector number of sectors corresponding to the identifier C ₂ cells G ₂ of 6 faces his performs search focuses on the channel identifier corresponding to the identifier C ₇ for cell G _0, the cell G ₂ Can be processed in a short time by performing a search by assigning priorities to the channel identifiers corresponding to the identifiers C ₂ , C ₁ , C ₃ . Since the number of sectors of the child cell does not include the number of sectors of the parent cell, it is not necessary to detect the channel identifier of the parent cell, and it is not necessary to detect a channel identifier that is not a candidate for handover.

  The base station and mobile device of the second embodiment can be configured in the same manner as in the first embodiment.

<Third Embodiment>
FIG. 15 is a diagram showing an example of a channel identifier assignment method according to an embodiment of the present invention, and shows a case where a child cell called an overhanging cell exists in a cell constituting the mobile communication system.

  In this case, as described in the above embodiment, it is preferable to group a set of geographically separated sectors as a single area, instead of grouping for each base station. A set of such sectors is called a ramp area.

  The ramp area refers to a set of at least one adjacent sector, and the minimum unit of the ramp area is a sector. For example, in the case of an overhang cell, a ramp area can be defined as shown by the dotted line in FIG. 16A. Further, as indicated by a dotted line in FIG. 16B, the ramp area can be defined as the same area as the cell of the base station. As shown by the dotted line in FIG. 16C, the ramp area can be composed of a plurality of base station cells. As shown by the dotted line in FIG. 16D, the ramp area can also be defined as a set of sectors of a plurality of base stations. Furthermore, one sector may belong to a plurality of lamp areas.

  For example, when a plurality of cells are aggregated by actively using overhang cells in a future mobile communication system, the lamp area can be flexibly assembled.

  When the lamp area and the cell of the base station match, transmission of broadcast information can be easily synchronized at the same base station, so a common broadcast received from a plurality of sectors (or a parent cell and a child cell) Information can be synthesized and received. In particular, in a system in which OFDM (Orthogonal Frequency Division Multiplexing) is applied to a downlink transmission scheme such as Evolved UTRA and UTRAN (Super3G), which is being standardized by 3GPP, the same information symbol is transmitted at the same frequency (OFDM subcarrier) and at the same timing. Since the symbols are naturally combined on the radio propagation when transmitted by the mobile station, the mobile station does not need to perform a special combining process. Therefore, it is beneficial to more aggressively aggregate the overhanging cells into the same base station and synchronously transmit the broadcast information between the aggregated cells. On the other hand, if the lamp area and the cell of the base station do not match, the transmission of the broadcast information is not necessarily synchronized. In order to enable combined reception, it is necessary to synchronize the transmission of notification information within the lamp area. As a synchronization method, a synchronization method using GPS, a synchronization method using a network signal, and the like can be considered. However, this embodiment does not require synchronization between cells in the lamp area or between lamp areas, and can also be applied to an asynchronous system.

  Here, the channel identifier assignment method of the present embodiment is executed by the following procedure.

(1) The available channel identifiers are grouped into m pieces in numerical order, and a group is assigned to each lamp area. That is, when the group identifier is represented by G and the channel identifier identifier is represented by C,
G ₀ = {C ₁ , C ₂ ,... C _m }
G ₁ = {C _{m + 1} , C _{m + 2} ,... C _{m + m} }
・
・
G _i = {C _{mi + 1} , C _{mi + 2} ,... C _{mi + m} }
・
・
And then, it assigns an identifier G _i group for each lamp area.

(2) Allocate the channel identifier from the first sector to the m-th sector in numerical order within each group. That is,
Group G ₀ : C ₁ → sector 1, C ₂ → sector 2,...
Group G ₁ : C _{m + 1} → sector 1, C _{m + 2} → sector 2,...
・
・
Group G _i : C _{mi + 1} → sector 1, C _{mi + 2} → sector 2,...
・
・
And When assigning a channel identifier to a sector, an identifier having a number as close as possible to the nearest sector is assigned. Even when the number of sectors actually provided in each base station is exceeded, channel identifiers are assigned by design.

  By assigning the group identifier to each lamp area in this way, it is possible to flexibly cope with an overhanging cell or the like. The effect of reducing the peripheral information (SIB) can also be made larger than the base station unit. In addition, when the transmission of the notification information is synchronized within the ramp area, when one sector is detected, the other sectors in the ramp area are also in a synchronous relationship, so detection is easy.

<Third Embodiment: Part 1>
FIG. 17 is a diagram illustrating an example of broadcast information transmitted from the sector of the base station to the mobile device 20. In this example, the group identifier (G ₁ ) allocated to another ramp area adjacent to the sector captured by the mobile device 20 and the number of sectors (M = 7) included in the other ramp area are moved. Notification is made as peripheral information (SIB: System Information Block) for the machine 20.

The mobile device 20 that has received the broadcast information can perform a neighboring cell search by narrowing down the target based on the group identifier and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. That is, the mobile device 20 recognizes that the peripheral speed sector group _{G 1} of 7 from _"G 1, M = 7", the target channel identifier corresponding to the identifier _C 11 _{-C 17} for the group _{G 1} By narrowing down the search, processing can be performed in a short time.

<Third embodiment: Part 2>
FIG. 18 is a diagram illustrating another example of notification information transmitted to the mobile device 20. In this example, the identifier of the channel identifier (C ₁₅ ) assigned to the sector captured by the mobile device 20 and the sector of another adjacent ramp area where handover frequently occurs, and the number of sectors included in the other ramp area ( M = 7) is reported as peripheral information (SIB) for the mobile device 20.

The mobile device 20 that has received this broadcast information can perform a neighbor cell search by narrowing down the target based on the identifier of the channel identifier and the number of sectors, thereby reducing the time and power consumption required for the neighbor cell search. That is, the mobile device 20 recognizes from “C ₁₅ , M = 7” that the sector corresponding to the identifier C ₁₅ of the group G ₁ with seven sectors is facing itself, and the identifier C for the group G ₁ It is possible to perform processing in a short time by performing a search by assigning priorities to channel identifiers corresponding to ₁₅ , C ₁₄ , C ₁₆ .

<Third embodiment: Part 3>
FIG. 19 is a diagram illustrating another example of the notification information transmitted to the mobile device 20. In this example, the lamp area identifier (G ₁ ) assigned to another lamp area adjacent to the sector captured by the mobile device 20 and the number of sectors (M = 7) included in the other lamp area are: Notification is made as peripheral information (SIB) for the mobile device 20.

The mobile device 20 that has received the broadcast information can perform a neighboring cell search by narrowing down the target based on the identifier of the lamp area and the number of sectors, thereby reducing the time and power consumption required for the neighboring cell search. That is, the mobile device 20 recognizes that the lamp area _{G 1} in the number of sectors from the _"G 1, M = 7" is 7 Surrounding, a channel identifier corresponding to the identifier _C 1 -C ₇ Lamp area _{G 1} By performing a search with a target narrowed down, processing can be performed in a short time.

<Third embodiment: Part 4>
FIG. 20 is a diagram illustrating another example of notification information transmitted to the mobile device 20. In this example, an identifier (G ₁ ) of a ramp area assigned to another ramp area adjacent to the sector captured by the mobile device 20 and another ramp adjacent to the sector frequently captured by the mobile device 20 are frequently handed over. The identifier (C ₅ ) of the channel identifier assigned to the sector of the area and the number of sectors (M = 7) included in the other lamp area are reported as peripheral information (SIB) for the mobile device 20. Yes.

The mobile device 20 that has received the broadcast information performs a neighbor cell search based on the identifier of the lamp area, the identifier of the channel identifier, and the number of sectors, thereby reducing the time and power consumption required for the neighbor cell search. Can do. That is, the mobile station 20 recognizes from “G ₁ , C ₅ , M = 7” that the sector corresponding to the identifier C ₅ of the ramp area G ₁ with 7 sectors faces the ramp area G by performing a search focuses on the channel identifier corresponding to the identifier C ₅ for _1, it can be processed short time.

<Third Embodiment: Configuration Example of Control Device for Each Lamp Area>
FIG. 21 is a diagram illustrating a configuration example of the control device 50 for each lamp area according to the embodiment of the present invention. The control device 50 is installed for each lamp area. When the lamp area matches the cell of the base station, the control device 50 may be installed in the base station.

  In FIG. 21, the control device 50 includes at least a broadcast information setting control unit 504 and a channel identifier setting control unit 506. Each sector includes at least broadcast information storage section 508, channel identifier generation section 510, broadcast information channel information configuration section 512, modulation section 514, multiplexing section 516, amplification section 518, antenna 520, other channel signal processing section 522, and network interface. 524.

  The broadcast information setting control unit 504 is connected to the broadcast information storage unit 508 corresponding to each sector, and has a function of controlling the setting of broadcast information for each sector. Here, the “broadcast information” is information for the base station to broadcast to mobile stations located in each sector based on the method described in FIG. 17, FIG. 18, FIG. 19, and FIG. . The channel identifier setting control unit 506 is connected to the channel identifier generation unit 510 corresponding to each sector, selects a channel identifier number assigned to each sector from a group (lamp area) and sets the channel identifier generation unit 510, and controls the channel identifier generation unit 510 It has a function. The functions of broadcast information storage section 508, channel identifier generation section 510, broadcast information channel information configuration section 512, modulation section 514, multiplexing section 516, amplification section 518, antenna 520, other channel signal processing section 522, and network interface 524 are as follows: Since the function is the same as that described with reference to FIG.

  When synchronizing the transmission of broadcast information within the lamp area, a synchronization signal is input to broadcast information channel information configuration section 512. The synchronization signal may be generated using GPS, or may be generated using a signal of the upper network.

  The mobile device of 3rd Embodiment can be comprised similarly to 1st Embodiment. When transmission of the notification information is synchronized within the lamp area, the wireless reception unit 204 can perform combined reception of the notification information.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments, various modifications and changes may be made to the embodiments without departing from the broad spirit and scope of the invention as defined in the claims. Obviously you can. In other words, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

It is a figure which shows the concept of the cell and sector in a mobile communication system. It is a figure which shows the example of the channel identifier allocation method concerning one Embodiment of this invention. It is a figure (the 1) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 2) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure which shows the example by which the channel identifier of the same combination is allocated. It is a figure (the 3) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 4) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure which shows the structural example of the base station concerning one Embodiment of this invention. It is a figure which shows the structural example of the moving apparatus concerning one Embodiment of this invention. It is a figure which shows the example of the channel identifier allocation method concerning one Embodiment of this invention. It is a figure (the 1) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 2) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 3) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 4) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure which shows the example of the channel identifier allocation method concerning one Embodiment of this invention. It is a figure which shows an example of a lamp area. It is a figure which shows an example of a lamp area. It is a figure which shows an example of a lamp area. It is a figure which shows an example of a lamp area. It is a figure (the 1) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 2) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 3) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure (the 4) which shows the example of the alerting | reporting information transmitted to a mobile apparatus. It is a figure which shows the structural example of the control apparatus for every lamp area concerning one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Base station 20 Mobile station 30 Cell 40 Sector 50 Control apparatus 102 User interface 104 Broadcast information setting control part 106 Channel identifier setting control part 108 Broadcast information storage part 110 Channel identifier generation part 112 Broadcast information channel information structure part 114 Modulation part 116 Multiplexing Conversion unit 118 amplifying unit 120 antenna 122 other channel signal processing unit 124 network interface 202 antenna 204 wireless receiving unit 206 channel identifier search unit 210 control unit 212 memory unit 504 broadcast information setting control unit 506 channel identifier setting control unit 508 broadcast information storage unit 510 Channel identifier generation unit 512 Broadcast information channel information configuration unit 514 Modulation unit 516 Multiplexing unit 518 Amplifying unit 520 Antenna 522 Other channel signal processing unit 524 Network Work interface

Claims (28)

A method of assigning a channel identifier for identifying a sector of a cell formed by a base station of a mobile communication system,
Group the available channel identifiers in m number order and assign a group to each base station cell;
A channel identifier assigning method, wherein the channel identifier is assigned from the first sector to the m-th sector in numerical order within each group. A method for reporting peripheral information from a base station to a mobile device that has captured a sector of a cell formed by a base station of a mobile communication system,
Based on the premise that the available channel identifiers are grouped m by number in order of numbers, and groups are assigned to the cells of each base station, and the channel identifiers in each group are assigned from the first sector to the m-th sector in order of numbers. ,
An identifier of a group assigned to another cell adjacent to the sector captured by the mobile station;
The number of sectors included in the other cell
A peripheral information notifying method characterized by notifying as peripheral information for the mobile device. A method for reporting peripheral information from a base station to a mobile device that has captured a sector of a cell formed by a base station of a mobile communication system,
Based on the premise that the available channel identifiers are grouped m by number in order of numbers, and groups are assigned to the cells of each base station, and the channel identifiers in each group are assigned from the first sector to the m-th sector in order of numbers. ,
An identifier of a channel identifier assigned to a sector captured by the mobile station and a sector of another adjacent cell where frequent handover occurs;
The number of sectors included in the other cell
A peripheral information notifying method characterized by notifying as peripheral information for the mobile device. A method for reporting peripheral information from a base station to a mobile device that has captured a sector of a cell formed by a base station of a mobile communication system,
On the premise that the same combination of channel identifiers is assigned to each base station cell sector,
An identifier assigned to another cell adjacent to the sector captured by the mobile station;
The number of sectors included in the other cell
A peripheral information notifying method characterized by notifying as peripheral information for the mobile device. A method for reporting peripheral information from a base station to a mobile device that has captured a sector of a cell formed by a base station of a mobile communication system,
On the premise that the same combination of channel identifiers is assigned to each base station cell sector,
An identifier assigned to another cell adjacent to the sector captured by the mobile station;
An identifier of a channel identifier assigned to a sector captured by the mobile station and a sector of another adjacent cell where frequent handover occurs;
The number of sectors included in the other cell
A peripheral information notifying method characterized by notifying as peripheral information for the mobile device. A base station constituting a mobile communication system,
Means for assigning one group obtained by grouping available channel identifiers in order of m to a cell of the base station;
Means for allocating the channel identifier from the first sector to the m-th sector in numerical order within the group. In the base station according to claim 6,
For a mobile device that has captured a sector of a cell formed by the base station, an identifier of a group assigned to another cell adjacent to the sector captured by the mobile device, and the number of sectors included in the other cell, A base station characterized by comprising means for reporting as peripheral information. In the base station according to claim 6,
For the mobile station that has captured the sector of the cell formed by the base station, the identifier of the channel identifier assigned to the sector captured by the mobile station and the sector of another adjacent cell that frequently undergoes handover, and the other A base station comprising means for reporting the number of sectors included in the cell as peripheral information. A base station constituting a mobile communication system,
On the premise that the same combination of channel identifiers is assigned to each base station cell sector,
For a mobile station that has captured a sector of a cell formed by the base station, the identifier assigned to another cell adjacent to the sector captured by the mobile station and the number of sectors included in the other cell A base station comprising means for informing as information. A base station constituting a mobile communication system,
On the premise that the same combination of channel identifiers is assigned to each base station cell sector,
For a mobile device that has captured a sector of a cell formed by the base station, an identifier assigned to another cell adjacent to the sector that the mobile device has captured, and a sector frequently captured by the mobile device A base station comprising means for reporting, as peripheral information, an identifier of a channel identifier assigned to a sector of another adjacent cell that occurs and the number of sectors included in the other cell. A mobile device used in a mobile communication system,
Based on the premise that the available channel identifiers are grouped m by number in order of numbers, and groups are assigned to the cells of each base station, and the channel identifiers in each group are assigned from the first sector to the m-th sector in order of numbers. ,
Means for receiving, as peripheral information, the identifier of the group assigned to another cell adjacent to the sector captured by the mobile station and the number of sectors included in the other cell from the base station of the captured sector;
A mobile device comprising: means for performing a peripheral cell search by narrowing down a target based on the group identifier and the number of sectors. A mobile device used in a mobile communication system,
Based on the premise that the available channel identifiers are grouped m by number in order of numbers, and groups are assigned to the cells of each base station, and the channel identifiers in each group are assigned from the first sector to the m-th sector in order of numbers. ,
The identifier of the channel identifier assigned to the sector of the adjacent cell that frequently undergoes handover and the sector captured by the mobile device and the number of sectors included in the other cell are Means for receiving as information,
A mobile device comprising: means for performing a peripheral cell search by narrowing down a target based on the identifier of the channel identifier and the number of sectors. A mobile device used in a mobile communication system,
On the premise that the same combination of channel identifiers is assigned to each base station cell sector,
Means for receiving the identifier assigned to another cell adjacent to the sector captured by the mobile station and the number of sectors included in the other cell as peripheral information from the base station of the captured sector;
A mobile device comprising: means for performing a peripheral cell search by narrowing down a target based on the cell identifier and the number of sectors. A mobile device used in a mobile communication system,
On the premise that the same combination of channel identifiers is assigned to each base station cell sector,
An identifier assigned to another cell adjacent to the sector captured by the mobile device, an identifier of a channel identifier assigned to the sector captured by the mobile device and a sector of another adjacent cell that frequently undergoes handover, and Means for receiving the number of sectors included in the other cell as peripheral information from the base station of the captured sector;
A mobile device comprising: means for performing a peripheral cell search by narrowing down a target based on the cell identifier, the channel identifier identifier, and the number of sectors. The mobile device according to any one of claims 11 to 14,
When no broadcast information is received from the sector of the base station, a search is started from the first channel identifier of each group or cell on the mapping, and each group on the mapping or sequentially until the channel identifier is captured A mobile device comprising means for searching for a channel identifier of the next rank in a cell. A method of assigning a channel identifier for identifying a sector formed by a base station of a mobile communication system,
Grouping base station sectors into ramp areas consisting of at least one adjacent sector;
Group the available channel identifiers into a predetermined number in numerical order;
A channel identifier assigning method, wherein the channel identifiers are assigned to sectors in a ramp area in numerical order. A method for informing peripheral information from a base station to a mobile device that has captured a sector formed by a base station of a mobile communication system,
Base station sectors are grouped into ramp areas consisting of at least one adjacent sector, group identifiers are assigned to the ramp areas, available channel identifiers are grouped into a predetermined number in numerical order, and the channel identifiers are , On the premise of assigning the lamp area sectors in numerical order,
An identifier of a group assigned to another ramp area adjacent to the sector captured by the mobile;
The number of sectors included in the other ramp area
A peripheral information notifying method characterized by notifying as peripheral information for the mobile device. A method for informing peripheral information from a base station to a mobile device that has captured a sector formed by a base station of a mobile communication system,
The base station sectors are grouped into ramp areas consisting of at least one adjacent sector, the available channel identifiers are grouped into a predetermined number in numerical order, and the channel identifiers are assigned to the ramp area sectors in numerical order. On the premise
A channel identifier assigned to a sector in another ramp area adjacent to the sector captured by the mobile station;
The number of sectors included in the other ramp area
A peripheral information notifying method characterized by notifying as peripheral information for the mobile device. A method for informing peripheral information from a base station to a mobile device that has captured a sector formed by a base station of a mobile communication system,
Based on the assumption that the base station sectors are grouped into ramp areas consisting of at least one adjacent sector, the group identifier is assigned to the ramp area, and the channel identifier is assigned to the ramp area sector,
An identifier of a group assigned to another ramp area adjacent to the sector captured by the mobile;
A channel identifier assigned to a sector in another ramp area adjacent to the sector captured by the mobile station;
The number of sectors included in the other ramp area
A peripheral information notifying method characterized by notifying as peripheral information for the mobile device. Means for grouping the available channel identifiers into a predetermined number in numerical order;
Means for assigning the channel identifiers in order of numbers to sectors in a ramp area composed of at least one adjacent sector. The control device according to claim 20,
Means for assigning a group identifier to the lamp area;
For a mobile device that has captured a sector in a lamp area to which the control device belongs, an identifier of a group assigned to another lamp area adjacent to the sector captured by the mobile device, and a sector included in the other lamp area And a means for informing the number as peripheral information. The control device according to claim 20,
For a mobile device that has captured a sector in the lamp area to which the control device belongs, a channel identifier assigned to a sector in another ramp area adjacent to the sector that the mobile device has captured, and included in the other lamp area A control device further comprising means for informing the number of sectors as peripheral information. Means for assigning a group identifier to the lamp area;
Means for assigning channel identifiers to sectors in the ramp area;
For a mobile device that has captured a sector in the ramp area to which the control device belongs, an identifier of a group assigned to another ramp area adjacent to the sector captured by the mobile device, and a sector that is captured by the mobile device A control device further comprising: means for informing, as peripheral information, a channel identifier assigned to a sector in another ramp area and the number of sectors included in the other ramp area. The control device according to any one of claims 21 to 23,
The control apparatus which further has a means to synchronize the alerting | reporting of the periphery information with respect to a mobile apparatus. A mobile device used in a mobile communication system,
Base station sectors are grouped into ramp areas consisting of at least one adjacent sector, group identifiers are assigned to the ramp areas, available channel identifiers are grouped into a predetermined number in numerical order, and the channel identifiers are , On the premise of assigning the lamp area sectors in numerical order,
Means for receiving, as peripheral information, an identifier of a group assigned to another lamp area adjacent to the sector captured by the mobile device and the number of sectors included in the other lamp area;
Means for performing a peripheral cell search by narrowing down the target based on the group identifier and the number of sectors. A mobile device used in a mobile communication system,
The base station sectors are grouped into ramp areas consisting of at least one adjacent sector, the available channel identifiers are grouped into a predetermined number in numerical order, and the channel identifiers are assigned to the ramp area sectors in numerical order. On the premise
Means for receiving, as peripheral information, a channel identifier assigned to a sector of another ramp area adjacent to the sector captured by the mobile device and the number of sectors included in the other ramp area;
And a means for performing a peripheral cell search by narrowing down a target based on the channel identifier and the number of sectors. A mobile device used in a mobile communication system,
Based on the assumption that the base station sectors are grouped into ramp areas consisting of at least one adjacent sector, the group identifier is assigned to the ramp area, and the channel identifier is assigned to the ramp area sector,
The identifier of the group assigned to the other ramp area adjacent to the sector captured by the mobile station, the channel identifier assigned to the sector of the other ramp area adjacent to the sector captured by the mobile station, and the other Means for receiving the number of sectors included in the ramp area as peripheral information;
And a means for performing a peripheral cell search by narrowing down a target based on the channel identifier and the number of sectors. The mobile device according to any one of claims 25 to 27,
A mobile device further comprising means for synthesizing received peripheral information.

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