KR20010001420A - Elevator repeater system and its communicating method in indoor cell environments - Google Patents

Abstract

PURPOSE: A method for connecting calls in an elevator relaying system is provided to install a wireless functional unit for managing a propagation transceiving in an elevator, so that mobile subscribers can continue to call under a good speech quality environment as coming in and out the elevator, and to remove busy handoffs in the elevator. CONSTITUTION: If a busy subscriber enters a stand-by area of an elevator cell, to be transferred to other floor while talking on a phone through a repeater of a floor cell in a building, a mobile station measures signal strength from two repeaters and decides that a signal strength of a repeater of the elevator cell is stronger than a signal strength of the repeater of the floor cell, then performs a handoff to the elevator cell(S10). The mobile station connects a call through a wireless functional unit of the elevator cell, and waits for the call until an elevator door is open(S20). If the door is open, the mobile station connects the call through a wireless functional unit of the stand-by area, and simultaneously connects the call through a wireless functional unit of an elevator, to prepare for the subscriber entering the elevator(S30). If the subscriber enters the elevator and the door is closed, a connection with the wireless functional unit of the stand-by area is cut off, and the subscriber talks on the phone through the wireless functional unit only of the elevator(S40).

Description

Elevator repeater system and its communicating method in indoor cell environments

The present invention relates to a mobile elevator repeater system and a method of calling the same in an indoor cell environment, and in particular, mobile phone subscribers can not only maintain a good quality call without interruption while the elevator is in or out of the elevator, but can also make calls within the elevator. A mobile elevator repeater system capable of eliminating the occurrence of heavy handoff and a communication method thereof.

A repeater is a wireless facility auxiliary facility that amplifies weak radio waves between a base station and a mobile station so that smooth communication can be achieved. The cost and size of the base station have become an important problem as the cell is miniaturized to accommodate the explosive spread of mobile phones. The repeater has recently been in the spotlight as a system to compensate for these shortcomings.

When installing the system using a repeater, it has the same coverage as the base station at the cost of 1/10 of the existing base station, and because of its small size, it can be easily installed in telegraph poles, street lights, building walls, etc. without the need for steel towers or containers. There is no fear of damaging the environment or damaging the city's beauty. Also, the construction of one base station usually takes more than a month, but the repeater can be installed in about one day.

Therefore, indoor cell service using repeater which is cheap and small and easy to install is useful because subscriber density is higher than other regions and communication in building that needs to provide multimedia service in the future requires numerous wireless channels.

Here, we will deal with the elevator repeater system of an indoor cellular system that uses a plurality of repeaters to service subscribers in a building.We call one repeater serviceable area as a cell and call as the subscriber moves out of the existing cell. It is necessary to replace the repeater that talks to the mobile station because of poor quality, which is defined as handoff.

Cell planning schemes have been researched to effectively increase the number of subscribers available by reducing the cell size by placing a repeater. In particular, in the building, the density of subscribers is higher than that of other regions, and it is expected to become a major stage for using multimedia services in the future.

1 is a diagram illustrating a lift repeater system configuration in a conventional indoor cellular system. Each cell 10 is arranged floor by floor and the mobile subscriber makes a call while the mobile station 20 communicates with the repeater via an antenna 31 of the floor repeater 30 that governs each cell 10.

Since the system does not manage a separate relay inside the elevator, the mobile station 20 to make a call in the elevator 40 requests communication from the repeater with the strongest signal strength among the surrounding floor repeaters 30 on each floor. do.

References in this regard include papers from D. Stamatelos and A. Ephremides, "Spectral Efficiency and Optimal Base Placement for Indoor Wireless Networks," IEEE J. Select. Areas Commun., Vol. 14, no. 4, May 1996 and in "Distributed Antennas for Indoor Radio Communications", IEEE Trans., Papers of A. M. Saleh, A. J. Rustako and R. S. Roman. Commun., Vol. COM-35, no. 12, Dec. 1987 and K. Morita and H. Ohtsuka, "The New Generation of Wireless Communications Based on Fiber-Radio Technologies", IEICE Trans. Commun., Vol. E76-B, no. 9, Sept. There is 1993.

The first paper determines the optimal base station location for a specific floor rather than multiple floors, but if it is extended to a multi-storey building and the cells are managed separately by floor, the elevator inside or inside the elevator can be moved up and down like a lift. Not only is it difficult to make a smooth call, but it also causes a lot of handoffs. The second paper constructs a cell using a distributed antenna for a specific layer. In the third paper, a cell was constructed by installing a simple repeater for each floor.

However, problems can arise when attempting to service a mobile station inside an elevator via such conventional indoor cellular systems. That is, since most elevators are surrounded by metal, the transmission signals sent by the mobile stations inside the elevators undergo tremendous signal decay before reaching the surrounding repeaters. Likewise, the transmission signal sent by the repeater is subject to tremendous signal decay before reaching the mobile station inside the elevator.

Therefore, in a conventional indoor cellular system, the call inside the elevator is almost impossible. Even if the call is possible inside the elevator, as shown in FIG. 1, since the cell goes through a plurality of cells during a call, there is a problem of experiencing several handoffs.

An object of the present invention for solving the problems of the prior art as described above is that mobile phone subscribers can maintain a good quality call seamlessly while inside or inside the elevator, as well as during handoff during the call. The present invention provides a mobile elevator repeater system and a communication method thereof in an indoor cell environment that can eliminate generation.

1 is a view showing the configuration of a lift repeater system in a conventional indoor cellular system

2 is a diagram showing the configuration of an elevator repeater system in an indoor cellular system according to a preferred embodiment of the present invention.

3 is a view showing the configuration of an elevator repeater system when there are a plurality of elevators in an indoor cellular system according to a preferred embodiment of the present invention.

4 is a diagram illustrating a call process of a mobile subscriber in an elevator in an elevator repeater system according to an exemplary embodiment of the present invention.

5 is a diagram illustrating a call process of a mobile subscriber entering a lift in a lift repeater system according to a preferred embodiment of the present invention.

6 is a diagram illustrating a call process of a mobile subscriber coming out of the elevator in the elevator repeater system according to the preferred embodiment of the present invention.

7 is a flowchart illustrating a call method of a mobile subscriber entering a lift in an elevator repeater system according to a preferred embodiment of the present invention.

8 is a flowchart illustrating a call method of a mobile subscriber coming out of the elevator in the elevator repeater system according to the preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: floor cell 20: mobile station

30: floor repeater 31: antenna

40, 51: elevator 50: elevator cell

52: waiting area 60: elevator repeater

61, 62: wireless function unit 63: relay function unit

70: floor cell

A feature of the mobile elevator repeater system in an indoor cell environment of the present invention for achieving the above object is a mobile elevator repeater system covering an area including a mobile elevator in an indoor cell environment having a repeater for each floor. The present invention provides a wireless function unit for transmitting and receiving radio waves therein.

Another feature of the mobile elevator repeater system in the indoor cell environment of the present invention for achieving the above object is that the elevator waiting for the mobile subscriber busy to use the mobile elevator and the elevator in an indoor cell environment having a repeater for each floor. A mobile elevator repeater system covering an area, comprising: a relay function unit arranged at an appropriate position of an elevator cell managed by the elevator repeater and responsible for interfacing with a central base station managing the elevator repeater and amplifying a signal; And a repeater disposed in a standby area and having a plurality of radio function units respectively responsible for radio wave transmission and reception, and a mobile station for connecting to the repeater relay function unit through the plurality of radio function units of the repeater.

A feature of the call method in the mobile elevator repeater system in the indoor cell environment of the present invention for achieving the above object is that a mobile subscriber waiting for a call to use the mobile elevator and the elevator in an indoor cell environment having a repeater for each floor. A communication method in a mobile elevator repeater system covering an elevator waiting area and having one relay function and a plurality of wireless functions, the method comprising: handing off a floor cell covering each floor to an elevator cell; Calling through a wireless function unit located in a standby area, talking through a wireless function unit of the lift unit and a wireless function unit of the elevator, and communicating only through a wireless function unit of the elevator unit. .

Another feature of the call method in the mobile elevator repeater system in the indoor cell environment of the present invention for achieving the above object covers a waiting area for using the mobile elevator and the elevator in an indoor cell environment having a repeater for each floor. A communication method in a mobile elevator repeater system having one relay function unit and a plurality of wireless function units, the method comprising: making a call through only the radio function unit of the elevator, Talking through a functional unit, and handing off the elevator cell to the floor cell covering each floor.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, a preferred embodiment according to the present invention will be described with reference to the accompanying drawings.

2 is a view showing the configuration of an elevator repeater system in an indoor cellular system according to a preferred embodiment of the present invention. In this system, the waiting areas of each floor waiting for the lift and the elevator are grouped separately into one cell 50, and the surrounding floor cells 70 stay in each floor except for the jurisdiction areas of the elevator cell 50. Only subscribers will be serviced.

The elevator repeater system of the present invention includes an elevator repeater 60 for servicing elevator cell 50 and a mobile station 20 entering the cell. The elevator repeater 60 includes one relay function unit 63 and a plurality of wireless function units 61 and 62, the relay function unit 63 having a central base station for managing the elevator repeater 60. It is disposed at an appropriate position (for example, rooftop, basement, any floor) of the elevator cell 50 which is responsible for the interface and signal amplification and is managed by the repeater. In addition, the plurality of wireless functional units 61 and 62 are in charge of radio transmission and reception and are respectively disposed in the elevator and the standby area. In particular, the wireless functional units 61 and 62 include antennas. The mobile station 20 then connects with the relay function unit 63 via a plurality of wireless function units of the elevator repeater 60.

3 is a diagram showing the configuration of an elevator repeater system when there are a plurality of elevators in an indoor cellular system according to a preferred embodiment of the present invention. In this system, a plurality of elevators and waiting areas of each floor waiting for the elevators are bundled into one cell 50 to serve. If the subscriber traffic using elevators is high, the base station may come directly to the location of the relay function 63 to service it.

With this configuration, the elevator repeater system covering all the elevators in the building and the waiting areas of each floor waiting to ride the elevator provides communication service, so there is no interruption of calls even in a closed elevator moving up and down and handoff. Ensure good quality communication.

Looking at the process of the communication of good quality with reference to Figures 4 to 6 as follows.

4 illustrates a call process of a mobile subscriber in an elevator in an elevator repeater system according to a preferred embodiment of the present invention. Here, the mobile station 20 of the mobile subscriber in the call communicates with the elevator repeater 60 through the wireless function unit 62 inside the elevator, so that even during the vertical movement of the elevator, the handoff does not occur. do.

Figure 5 shows the call process of the mobile subscriber entering the elevator in the elevator repeater system according to a preferred embodiment of the present invention. Here, the mobile station 20 of the mobile subscriber in the call approaching the elevator to ride the elevator first enters the waiting area 52 and hands off to the elevator cell 50 (S1), and the wireless function unit 61 of the waiting area. The communication with the lift repeater 60 through the (S2). At this time, the wireless function unit 61 of the standby area is connected to the relay function unit 63 of the elevator via a wire, which is shown by a dashed-dotted line in the drawing and shows the connection relationship.

In addition, when the elevator arrives at the floor and the elevator door is opened, the mobile station 20 simultaneously communicates not only with its standby area but also through the wireless function unit 62 inside the elevator (S3), and the subscriber rides in the elevator. When the elevator door is closed, the entire elevator is surrounded by metal and shielded, so that the connection with the wireless function unit 61 in the standby area is cut off, but the communication with the wireless function unit 62 inside the elevator continues.

Eventually, in this system, mobile subscribers in a call can enter the elevator to ensure a seamless call.

Figure 6 shows the call process of the mobile subscriber coming out of the elevator in the elevator repeater system according to a preferred embodiment of the present invention. Here, the subscriber (S5) that communicated through the wireless functional unit 62 in the elevator inside the elevator is open at the same time as the elevator door is communicated through the wireless functional unit 61 in the standby area as well ( S6), when the subscriber gets out of the elevator and the elevator door is closed, the whole elevator is shielded, so that the connection with the wireless function unit 62 inside the elevator is disconnected and only through the wireless function unit 61 in the waiting area of the newly arrived floor. While (S7) is handoff to the adjacent floor cell 70 (S8).

If the mobile subscriber exits the waiting area before the elevator door closes, the mobile station 20 is disconnected from the wireless function unit 62 inside the elevator and through the wireless function unit 61 of the waiting area of the newly arrived floor. The handoff is performed to the adjacent floor cell 70 without the communication process (S7) (S8).

Referring to Figs. 7 and 8, a call method of a mobile subscriber entering and exiting a lift in the elevator repeater system having the above-described configuration is as follows.

7 is a flowchart illustrating a call method of a mobile subscriber entering a lift in an elevator repeater system according to a preferred embodiment of the present invention.

The subscriber, who is talking through the repeater of the floor cell 70 in the building using the mobile station 20, enters the waiting area of the elevator cell 50 to move to another floor in the building. In the meantime, the mobile station 20 measures the reception strength of the signals transmitted from the two repeaters as described in the prior art, and determines that the reception strength of the repeater of the elevator cell is stronger than the reception strength of the repeater of the floor cell. Is handed off (step S10).

Thereafter, while the subscriber stays in the waiting area, the subscriber's mobile station 20 waits for the door of the elevator to open while making a call through the radio function of the elevator cell 50 (step S20).

After a certain amount of time, when the door of the elevator is opened, the mobile station 20 calls through the wireless function unit 61 in the standby area and also through the wireless function unit 62 in the elevator, thereby allowing the subscriber to lift the elevator. It prepares for the case of entering inside (step S30).

After that, when the subscriber actually enters the elevator and the door of the elevator is closed, the entire elevator is surrounded by metal and shielded, so that the connection with the wireless functional unit 61 in the standby area is cut off and only through the wireless functional unit 62 inside the elevator. The call is made (step S40).

8 is a flowchart illustrating a call method of a mobile subscriber coming out of the elevator in the elevator repeater system according to the preferred embodiment of the present invention. In this case, contrary to the case of FIG. 6, the subscriber who was talking inside the elevator continues the call while leaving the elevator.

The subscriber, who talks inside the elevator, talks only through the wireless function unit 62 inside the elevator because the entire elevator is shielded (step S50). After that, when the elevator arrives on the floor desired by the subscriber and the elevator door is opened, not only the wireless function unit 62 in the elevator but also the wireless function unit 61 in the waiting area are simultaneously called (step S60).

At this time, it is determined whether or not a call is made only through the wireless function unit 61 of the waiting area according to whether the subscriber passes through the waiting area before the elevator door is closed (step S70).

That is, when the subscriber stays in the standby area even after the elevator door is closed, the elevator cell 50 is handed off from the elevator cell 50 to the floor cell 70 through the step S80 of talking through the wireless function unit 61 of the standby area. (Step S90). On the other hand, when leaving the waiting area before the elevator door is closed, the elevator cell 50 is handed off from the elevator cell 50 directly to the floor cell 70 without going through the step of talking only through the wireless function unit 61 of the waiting area (step S90). ).

On the other hand, if the door of the elevator is opened on the floor that the subscriber does not want, the mobile station talking through the wireless function unit 62 of the elevator simultaneously with the wireless function unit 62 of the elevator while the door of the elevator is open, The call can also be made through the functional unit 61, but if the door of the elevator is closed without the subscriber falling, the call will be made only through the wireless functional unit 62 of the elevator again.

As described above, the present invention has been described with reference to preferred embodiments, but the present invention is not limited thereto, and the present invention may be embodied in various forms by adding various limitations or additions without departing from the technical spirit of the present invention. It is apparent to those skilled in the art to which the present invention pertains.

The mobile elevator repeater system and the communication method thereof in the indoor cell environment according to the present invention operating as described above allow mobile subscribers to maintain a good quality call seamlessly within the elevator while leaving the elevator and inside the elevator. It is effective to eliminate the occurrence of handoff during a call.

In addition, since the handoff is required before entering the waiting area, the subscribers who stayed in the waiting area enter the elevator at about the same time, and the effect of reducing the possibility of handoff failure is much reduced than when the elevator repeater which requests the handoff only serves the inside of the elevator. Have

Claims (7)

A mobile elevator repeater system for covering an area including a mobile elevator in an indoor cell environment having a repeater for each floor, A mobile elevator repeater system, characterized in that a radio function unit for transmitting and receiving radio waves is installed inside the elevator. A mobile elevator repeater system for covering a mobile communication elevator waiting area waiting for a mobile subscriber to use a mobile elevator in an indoor cell environment having a repeater for each floor, The relay repeater is disposed at an appropriate position of the elevator cell managed by the elevator repeater, and is arranged in the elevator and the standby area, and each relay function unit responsible for interface and signal amplification with the central base station managing the elevator repeater. A repeater having a wireless function unit including a plurality of antennas, And a mobile station for connecting with the relay function unit of the repeater through the plurality of wireless function units of the repeater. The method of claim 2, A mobile elevator repeater system in an indoor cell environment, characterized in that a plurality of elevators and waiting areas of each floor waiting for a lift are bundled into one cell. The method of claim 2, And the connection between the relay function unit of the elevator repeater and the wireless function unit of the elevator or the wireless function unit of the standby area is wired. A method of communication in a mobile elevator repeater system comprising a relay function unit and a plurality of wireless functions, covering a waiting area for using the mobile elevator and the elevator in an indoor cell environment having a repeater for each floor, Handing off the elevator cell from the floor cell covering each floor, Making a call through a wireless function located in a standby area of the elevator cell; Making a call through the wireless function unit of the waiting area and the wireless function unit of the elevator; A method of communication in a mobile elevator repeater system comprising the step of talking only through the wireless function of the elevator. A method of communication in a mobile elevator repeater system comprising a relay function unit and a plurality of wireless functions, covering a waiting area for using the mobile elevator and the elevator in an indoor cell environment having a repeater for each floor, Talking only through the wireless function unit of the elevator; Making a call through a wireless function unit of the elevator and a wireless function unit of the standby area; Handing off a lift cell to a floor cell covering each floor. The method of claim 6, And communicating through a wireless function located in a standby area of the elevator cell before handing off the elevator cell to the floor cell covering each floor.