KR100441218B1 - Implementation and usage method of hierarchical cell structure in wireless telecommunication network - Google Patents

Abstract

PURPOSE: A method for implementing and operating an HCS(Hierarchical Cell Structure) in a wireless communication network is provided to overlay a macro node-B and pico node-Bs in the HCS, so as to furnish various multimedia services in IMT-2000(International Mobile Telecommunications-2000). CONSTITUTION: A terminal enters an HCS network(201). The terminal selects a cell having the largest receiving energy as a serving cell(202). The terminal starts to negotiate with a network for a service to be transmitted(203). The network searches a service type requested by the terminal(204). If the terminal requests a 12.2kbps voice service, the service is assigned to a macro node-B(205), and if the terminal requests a 128kbps or 384kbps data service, the service is assigned to a pico node-B(206). A service rate is checked(210). In case of the 128kbps data service, the service is allocated to FA#1(Frequency Assignment #1) and FA#3(211) to start the 128kbps data service(212), and in case of the 384kbps data service, the service is allocated to FA#2 and FA#4(215) to start the 384kbps data service(216). If a data multi-call is performed(208), the voice service is transceived through the macro node-B(209) and the 128kbps or 384 kbps data service is transceived through the pico node-B(212,216). If a voice multi-call is received(213,217), the 128kbps or 384 kbps data service is transceived through the pico node-B(214,218) and the voice service is transceived through the macro node-B(207).

Description

Implementation of hierarchical cell structure in wireless communication network and its operation method {Implementation and usage method of hierarchical cell structure in wireless telecommunication network}

The present invention relates to the implementation of a hierarchical cell structure (HCS) in a wireless communication network and its technical field. In particular, a standard cell (macro) capable of providing various multimedia services in a next-generation wireless communication network such as IMT-2000, etc. On a computer-readable recording medium recording HCS, which is a structure in which a cell (Macro Node-B) and a Pico Node-B are overlayed, an operation thereof, and a program for realizing the method. It is about.

In the second generation mobile communication network where only voice service existed, the subscriber capacity required per cell was not so large that even a large city, which is a densely populated area, could use only a standard cell (Macro Node-B). However, in the next generation mobile communication system such as IMT-2000, since subscribers mainly use high-speed data services, the standard cell (Macro Node-B) alone cannot accommodate all the subscriber capacity within the corresponding cell coverage.

Therefore, in a data traffic-intensive area, the Pico Node-B in addition to the standard cell (Macro Node-B) should be configured in an overlay form to satisfy the required subscriber capacity. Therefore, in the current technical field, there is an urgent need for a method capable of satisfying various subscriber's various wireless multimedia service needs in a third generation mobile communication system.

The present invention has been proposed to meet the above-mentioned requirements, and includes a standard cell (Macro Node-B) and a pico cell (Macro Node-B) capable of providing various multimedia services in a next-generation wireless communication network such as IMT-2000. It is an object of the present invention to provide a method of implementing and operating HCS having a structure in which Pico Node-B is overlaid and a computer-readable recording medium recording a program for realizing the method.

1 is an exemplary configuration diagram of a wireless communication network having a hierarchical cell structure (HCS) to which the present invention is applied.

2 is a flow diagram of an embodiment of a method for operating a hierarchical cell structure (HCS) in accordance with the present invention.

* Explanation of symbols for the main parts of the drawings

a: Macro Node-B b: Pico Node-B

In order to achieve the above object, the present invention provides a method for implementing a hierarchical cell structure (HCS) in a wireless communication system, in a network environment in which a macro cell (Macro Node-B) and a pico cell (Pico Node-B) are mixed. A cell configuration step of supporting a voice service through the macro cell and a data service through the pico cell; A picocell separation step of allocating and separating each FA (Frequency Assignment) of the pico cell according to a transmission rate of the data service in order to reduce interference to other data services and voice services during the data service through the pico cell; And a data service support step of supporting a data service in the pico cell according to a data multicall request while the voice service is supported through the macro cell.

In addition, the present invention provides a method for implementing a hierarchical cell structure (HCS) in a wireless communication system, the macro cell in a network environment where a macro cell (Macro Node-B) and a pico cell (Pico Node-B) are mixed, A cell configuration step of supporting a voice service through a data service and supporting a data service through the pico cell; A cell separation step of allocating and separating each FA (Frequency Assignment) of the pico cell according to a transmission rate of the data service in order to reduce interference on other data services and voice services during the data service through the pico cell; And a voice service support step of supporting a voice service in the macro cell according to a voice multicall request while providing a data service through the pico cell.

In order to achieve the above object, the present invention provides a method for operating a hierarchical cell structure (HCS) in a wireless communication system, wherein a macro cell (Macro Node-B) and a pico cell (Pico Node-B) are mixed. A serving cell determining step of determining a serving cell when the terminal enters a network; A service type analyzing step of analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service supporting step of supporting, by the HCS network, a voice service through the macro cell during a voice service according to the analysis result of the service type analyzing step; According to an analysis result of the service type analysis step, a first data service support step of separating and supporting data service by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to the transmission rate of the data service during data service; ; And a second data service support step of simultaneously supporting a data service through the pico cell according to a data multicall request while the HCS network supports a voice service through the macro cell.

In addition, the present invention provides a method for operating a hierarchical cell structure (HCS) in a wireless communication system, in which a macro cell (Macro Node-B) and a pico cell (Pico Node-B) are mixed in a network of a terminal. A serving cell determining step of determining a serving cell upon entry; A service type analyzing step of analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service supporting step of supporting, by the HCS network, a voice service through the macro cell during a voice service according to the analysis result of the service type analyzing step; A data service support step of separating and supporting data services by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to the transmission speed of the data service according to the analysis result of the service type analysis step; And a voice service support step of simultaneously supporting a voice service through the macro cell according to a voice multicall request while the HCS network supports a data service through the pico cell.

Meanwhile, the present invention provides a wireless communication system having a processor for operating a hierarchical cell structure (HCS), in an HCS network environment in which a macro cell (Macro Node-B) and a pico cell (Bico Node-B) are mixed. A serving cell determination function for determining a serving cell when the terminal enters a network; A service type analysis function for analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service support function in which the HCS network supports a voice service through the macro cell during a voice service according to an analysis result of the service type analysis function; According to the analysis result of the service type analysis step, a first data service support function for separating and supporting data services by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to the transmission speed of the data service during data service ; And while the HCS network supports a voice service through the macro cell, a program for realizing a second data service support function for simultaneously supporting a data service through the pico cell according to a data multicall request. Provides a record medium that can be.

In addition, the present invention provides a wireless communication system having a processor for operating a hierarchical cell structure (HCS), in an HCS network environment where a macro cell (Macro Node-B) and a pico cell (Pico Node-B) are mixed. A serving cell determination function for determining a serving cell when the terminal enters a network; A service type analysis function for analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service support function in which the HCS network supports a voice service through the macro cell during a voice service according to an analysis result of the service type analysis function; A data service support function for separately supporting data services by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to a transmission speed of a data service according to an analysis result of the service type analysis step; And while the HCS network supports the data service through the pico cell, a program for realizing a voice service support function for simultaneously supporting a voice service through the macro cell in response to a voice multicall request. Provide a record carrier.

The present invention implements a hierarchical cell structure (HCS), which is a structure in which a standard cell (macro node-B) and a pico cell-B are overlaid in a next-generation mobile communication system such as IMT-2000. The present invention relates to a scheme and an operation algorithm. An implementation related scheme and an operation algorithm are proposed to effectively apply the HCS concept, which is emerging as a scheme for satisfying various wireless multimedia services in a third generation mobile communication system. Here, as an implementation method, a mapping relationship between each cell type and a service is proposed, and an operation algorithm proposes a process of actually transmitting and receiving a traffic starting from initial synchronization based on the content proposed by the implementation method.

According to the present invention, it is possible to meet various service needs of subscribers, which is the ultimate goal of the service provider, and to effectively select a concentrated traffic area to minimize the initial cell (base station) investment of the service provider. There are advantages to it.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the HCS implementation method will be described in more detail. This section describes each cell type and service mapping relationship.

Cells of the third generation mobile communication system (Node-B) such as IMT-2000 are classified into standard cells, small cells, pico cells, etc., similarly to the second generation mobile communication systems.

In the 2nd generation mobile communication system, since voice services are mainly used, standard, small, and pico cells have been selectively selected based on the cell installation location.

However, since the third generation mobile communication system such as IMT-2000 needs to support not only voice service but also various data services at the same time, the cell type to be displaced must be determined in consideration of various cell installation locations and traffic amounts. In addition, since various services must be supported in a specific cell, how to reduce interference, which is a weakness of Code Division Multiple Access (CDMA) within cell coverage, will be key. In addition, since the service coverage decreases as the transmission speed of the service that the cell needs to support increases, the cell should be arranged in consideration of this.

Accordingly, the present invention intends to propose two items in terms of implementation.

First, as shown in FIG. 1, a hierarchical cell structure in which a standard cell (Macro Node-B) (a) and a Pico Node-B (b) are overlaid In the HCS: Hierarchical Cell Structure, voice service is handled by a standard cell (Macro Node-B) (a), and high-speed data service is handled by Pico Node-B (b). . Because the voice service is a low-speed service with a maximum transmission speed of 12.2 kbps, the processing gain is high, so the coverage is sufficiently wide even if the transmission power is allocated low in the forward transmission in the cell Node-B. On the other hand, high-speed data such as 128 kbps / 384 kbps has a low processing gain, and thus the transmission power must be higher than that of the voice service. However, if the transmission power is excessively allocated to the high-speed data service, it may interfere with the voice service and other data service in service, resulting in lowering the overall system capacity. Therefore, even in the case of a high-speed data service, transmission power must be allocated within a range that does not significantly interfere with other services. For this reason, service coverage is reduced as compared with voice services because the disadvantage of low processing gain cannot be overcome. Accordingly, in the present invention, the high-speed data service utilizes Pico Node-B (b) with low service coverage to reduce the transmission power of the data service as much as possible. In addition, since the amount of traffic accommodated by the Pico Node-B (b) is limited, in the case of a voice service, a standard cell (macro) overlayed with the Pico Node-B (b) is used. Cell (Macro Node-B) (a).

Secondly, in order to minimize interference when Pico Node-B (b) takes charge of high-speed data service, services are separated by FA (Frequency Assignment). That is, assuming that 128 kbps data service and 384 kbps data service are presently mixed in Pico Node-B (b) and a total of four FAs exist, 128 kbps service is in charge of FA1 or FA3. The 384kbps service is in charge of FA2 or FA4. The amount of interference generated when high-speed services are mixed in the same FA is greater than the sum of the interferences when each service is separated. Therefore, separating data having heterogeneous service rates as much as possible can minimize mutual interference. In this context, the present invention separates heterogeneous service rates by differently assigning FA.

Now, the HCS operation algorithm will be described in more detail with reference to FIG. 2.

2 is a flowchart illustrating an embodiment of a method for operating a hierarchical cell structure (HCS) according to the present invention, and illustrates a procedure in which a terminal entering a network constructed in an HCS environment may receive a service through the following process. In this case, it is assumed that a voice (12.2kbps max.) Service, a 128kbps data service, and a 384kbps data service are mixed.

First, the terminal enters an HCS network overlaid with a standard cell (Macro Node-B) (a) and a Pico Node-B (b) (201). In this case, since the terminal has no information on the standard cell (Macro Node-B) (a) and Pico Node-B (b), the terminal searches for the cell having the largest received energy as a result of the energy search. serving) cell is selected (202).

Thereafter, the terminal registers a location through the cell selected as the serving cell, and starts negotiation with the network for the service to be transmitted by the terminal (203). In response, the network searches for a service type requested by the terminal (204).

As a result of the search, when the terminal requests a voice (12.2 kbps voice) service, the terminal is allocated to the standard cell (macro cell (Macro Node-B)) (a) (205), and the standard cell (macro cell (Macro Node-B) A 12.2 kbps voice service is initiated through (a) (207).

As a result of the search, when a data (128bps or 384kbps data) service request is made, it is allocated to Pico Node-B (b) (206) and 128kbps or 384kbps through Pico Node-B (b). Start a data service (212,217). If, as a result of the initial search, a terminal that selects a standard cell (macro cell-B) (a) as a serving cell, the service to be actually transmitted is a 384kbps data service, through service negotiation with the network ( 203), the channel information about the pico cell (Pico Node-B) (b) is received from the network. Thereafter, the terminal performs cell switching from the currently connected standard cell (Macro Node-B) (a) to Pico Node-B (b) (206). On the other hand, the reverse process of switching from a pico cell (Pico Node-B) (b) to a standard cell (Macro Node-B) (a) follows the same process (205).

Here, even when the terminal requests a data service, there are two services, 128kbps and 384kbps, according to the service rate (210), and separates the FA (Frequency Assignment) for each service to provide a service between different services. Interference can be minimized. In other words, it is well known that the situation where heterogeneous services are mixed in the same FA is much worse than the case in which each service is separated into different FAs. Therefore, in the present embodiment, for example, it is assumed that there are four FAs currently allocated in 5MHz broadband, and that there are only two types of data services, 128kbps and 384kbps. In this case, according to the transmission rate (210), in the case of a 128kbps data service, it is allocated to FA # 1 and FA # 3 (211), and the 128kbps data service is started through FA # 1 and FA # 3 (212), and 384kbps. In the case of a data service, 384kbps data is started through FA # 2 and FA # 4 by assigning them to FA # 2 and FA # 4 (215). By doing so, it is possible to minimize mutual interference of heterogeneous services.

During a voice and data service, a multi call problem may occur. First, the multi call will be more clearly defined.

While a particular terminal is currently using a voice service (207), the case of simultaneously using a 128 kbps or 384 kbps data service is referred to as "data multi call."

On the other hand, while a particular terminal is currently using a 128kbps or 384kbps data service (212,216), the case of using a 12.2kbps voice service at the same time is called "voice multi call".

The process of transmitting and receiving voice and data in such a multicall situation is as follows.

The voice service currently in service is a state in which a corresponding terminal is connected to a standard cell (Macro Node-B) (a). If the terminal requests 128 kbps or 384 kbps data service from the network, the network is a Pico Node-B overlaid with a standard cell (Macro Node-B) (a) to which the terminal is currently connected. (b), check whether the remaining resources of the discovered Pico Node-B (b) can support the 128kbps or 384kbps data service required by the terminal (208), and if the service is supported, the picocell (Pico Node-B) (b) transmits and receives a 128kbps or 384kbps data service. That is, the 128kbps data service is allocated to FA # 1 and FA # 3 (211), and the 128kbps data service is started through FA # 1 and FA # 3 (212). Assigning to FA # 4 (215), 384kbps data is started through FA # 2 and FA # 4 (216). Therefore, when data multicall is performed in the same terminal (208), the voice service is connected to and transmitted with a standard cell (Macro Node-B) (a) (209), and 128 kbps or 384 kbps data service is pico Cells (Pico Node-B) (b) is connected to transmit and receive (212,216).

On the other hand, while using the 128kbps or 384kbsp data service (212,216), when voice multicall is performed in the same terminal (213,217), 128kbps or 384kbps data service is connected to the Pico Node-B (b) The voice service transmits and receives (214 and 218), and the voice service is connected to and transmits (207) with a standard cell (Macro Node-B) (a).

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention can satisfy various wireless multimedia service needs of service subscribers in a 3rd generation mobile communication system, and can effectively select a concentrated traffic area and make an initial cell (base station) investment of a service provider. There is an effect that can be minimized.

Claims (12)

delete A method of implementing a hierarchical cell structure (HCS) in a wireless communication system, Cell configuration step of supporting a voice service through the macro cell and a data service through the pico cell in a mixed network environment of a macro cell (Pico Node-B) and a pico cell (Pico Node-B) ; A picocell separation step of allocating and separating each FA (Frequency Assignment) of the pico cell according to a transmission rate of the data service in order to reduce interference to other data services and voice services during the data service through the pico cell; And During the voice service support through the macro cell, a data service support step of supporting the data service in the pico cell according to a data multicall request A hierarchical cell structure implementation method in a wireless communication network comprising a. A method of implementing a hierarchical cell structure (HCS) in a wireless communication system, Cell configuration step of supporting a voice service through the macro cell and a data service through the pico cell in a mixed network environment of a macro cell (Pico Node-B) and a pico cell (Pico Node-B) ; A cell separation step of allocating and separating each FA (Frequency Assignment) of the pico cell according to a transmission rate of the data service in order to reduce interference on other data services and voice services during the data service through the pico cell; And A voice service supporting step of supporting a voice service in the macro cell according to a voice multicall request while providing a data service through the pico cell. A hierarchical cell structure implementation method in a wireless communication network comprising a. The method of claim 2 or 3, The cell separation step, Allocating data services by FA of the pico cell according to transmission rate, assuming that there are four FAs currently allocated in 5MHz broadband, and assuming that there are only two types of data services, 128kbps and 384kbps, 128kbps data A service is allocated to FA # 1 and FA # 3, and a 384kbps data service is allocated to FA # 2 and FA # 4. delete A method of operating a hierarchical cell structure (HCS) in a wireless communication system, A serving cell determining step of determining a serving cell when the terminal enters a network in an HCS network environment in which a macro cell and a pico cell are mixed; A service type analyzing step of analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service supporting step of supporting, by the HCS network, a voice service through the macro cell during a voice service according to the analysis result of the service type analyzing step; According to an analysis result of the service type analysis step, a first data service support step of separating and supporting data service by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to the transmission rate of the data service during data service; ; And A second data service supporting step of simultaneously supporting a data service through the pico cell according to a data multicall request while the HCS network supports a voice service through the macro cell; Hierarchical cell structure operating method in a wireless communication network comprising a. A method of operating a hierarchical cell structure (HCS) in a wireless communication system, A serving cell determining step of determining a serving cell when the terminal enters a network in an HCS network environment in which a macro cell and a pico cell are mixed; A service type analyzing step of analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service supporting step of supporting, by the HCS network, a voice service through the macro cell during a voice service according to the analysis result of the service type analyzing step; A data service support step of separating and supporting data services by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to the transmission speed of the data service according to the analysis result of the service type analysis step; And A voice service supporting step of simultaneously supporting a voice service through the macro cell according to a voice multicall request while the HCS network supports a data service through the pico cell. Hierarchical cell structure operating method in a wireless communication network comprising a. The method according to claim 6 or 7, The terminal, And transmitting and receiving voice data through the macro cell, and transmitting and receiving packet data through the pico cell when a data multicall occurs during a voice service. The method according to claim 6 or 7, The terminal, A method of operating a hierarchical cell structure in a wireless communication network, characterized in that a packet data (data except voice data) is transmitted and received through the pico cell, and voice data is transmitted and received through the macro cell when a voice multicall occurs during data service. . delete In a wireless communication system having a processor for operating a hierarchical cell structure (HCS), A serving cell determination function for determining a serving cell when the terminal enters a network in an HCS network environment in which a macro cell and a pico cell are mixed; A service type analysis function for analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service support function in which the HCS network supports a voice service through the macro cell during a voice service according to an analysis result of the service type analysis function; According to the analysis result of the service type analysis step, a first data service support function for separating and supporting data services by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to the transmission speed of the data service during data service ; And A second data service support function for simultaneously supporting data service through the pico cell according to a data multicall request while the HCS network supports a voice service through the macro cell. A computer-readable recording medium having recorded thereon a program for realizing this. In a wireless communication system having a processor for operating a hierarchical cell structure (HCS), A serving cell determination function for determining a serving cell when the terminal enters a network in an HCS network environment in which a macro cell and a pico cell are mixed; A service type analysis function for analyzing, by the HCS network, a type of a service to be transmitted and received by the terminal; A voice service support function in which the HCS network supports a voice service through the macro cell during a voice service according to an analysis result of the service type analysis function; A data service support function for separately supporting data services by allocating the HCS network by FA (Frequency Assignment) of the pico cell according to a transmission speed of a data service according to an analysis result of the service type analysis step; And While the HCS network supports the data service through the pico cell, a voice service support function for simultaneously supporting a voice service through the macro cell according to a voice multicall request A computer-readable recording medium having recorded thereon a program for realizing this.