RU2464731C1 - Method to identify mode of cell access in wireless communication system - Google Patents

Abstract

FIELD: information technologies.

SUBSTANCE: invention relates to user equipment (UE) providing wireless communication services, and also a method to detect a mode of basic station operation, i.e. a mode of connection (mode of access) with a cell on the basis of the fact, connection of which UE is permitted by a basic station in an improved universal mobile communications system (UMTS). A cell is identified as a hybrid cell, when a bit of cell indication type is set as "FALSE", but broadcasting transfer of subscriber group information is carried out. At the same time to one or more UE in a specific subscriber group or to all UE in a cell, access is permitted selectively in the specified hybrid cell, and at the same time the hybrid cell is viewed by UE as a cell of a closed subscriber group (CSG), when identification information of the hybrid cell subscriber group belongs to a permitted list of the closed subscriber group (CSG) of the specified UE.

EFFECT: provision for detection of a cell access mode in a wireless communication system.

15 cl, 13 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a wireless communication system and user equipment providing wireless communication services, and a method for determining an operating mode of a base station, i.e. the connection mode (access mode) of the cell, based on which connection of the user equipment is allowed by the base station in an advanced universal mobile telecommunications system (UMTS), which evolved from a universal mobile telecommunications system (UMTS) or a long-term development project (LTE), and more specifically to a method for determining a connection mode with a hundredth verification of the existence of a subscriber group identification, if it is determined that the connection mode with the hundredth is not allowed for one or more equipment belonging to a specific subscriber group.

State of the art

1 is a view illustrating a network architecture of an Advanced Terrestrial Radio Access Network (E-UTRAN), which is a mobile communication system to which the related art and the present invention relate. The E-UTRAN system has evolved from the existing UTRAN system, and the main work on its standardization is currently ongoing in 3GPP. E-UMTS can also be called a Long Term Evolution (LTE) project.

An E-UTRAN includes a plurality of e-NBs (Nodes B; hereinafter referred to as a “base station”), and a plurality of eNBs are connected to each other via an X2 interface. The e-NB is connected to user equipment (hereinafter referred to as "UE") via a wireless interface and connected to an advanced packet core (EPC) via an S1 interface.

An EPC may include a mobility management entity (MME), a serving gateway (S-GW), and a packet data network gateway (PDN-GW). The MME has information about the connection of the UE or the capabilities of the UE, and such information is mainly used to control the mobility of the UE. The S-GW is a gateway having an E-UTRAN as an endpoint, and the PDN-GW is a gateway having a PDN as an endpoint.

The radio interface protocol layers between the UE and the network can be divided into a first layer (L1), a second layer (L2) and a third layer (L3) based on the three lower layers of the basic Open System Interconnection (OSI) model, well known in communication systems. The physical layer belonging to the first layer provides information transmission services using the physical channel, and the radio resource control layer (hereinafter referred to as "RRC") located at the third level plays the role of radio resource management between the UE and the network. To accomplish this, the RRC layer exchanges RRC messages between the UE and the network.

2 and 3 are views illustrating the architecture of a radio interface protocol between a UE and a base station based on the 3GPP radio access network standard. The radio interface protocol horizontally includes a physical layer, a link layer and a network layer and is vertically divided into a user plane (U-plane) for transmitting information in the form of data and a control plane (C-plane) for sending control signaling. The protocol layers of FIGS. 2 and 3 can be divided into a first level (L1), a second level (L2) and a third level (L3) based on the three lower layers of the basic Open Systems Interconnection (OSI) model, well known in communication systems. These radio protocol layers exist in pairs in the UE and E-UTRAN to perform data transmission for the radio section.

Hereinafter, each level in the control plane of the radio protocol of FIG. 2 and the user plane of the radio protocol of FIG. 3 will be described.

The first layer as a physical layer provides a data service to the upper layer using a physical channel. The physical channel is connected to its upper layer, called the medium access control (MAC) layer, through the transport channel, and data is transferred between the MAC layer and the physical layer through the transport channel. Moreover, data is transmitted through the physical channel between different physical layers, in other words, between the physical layer of the transmitting side and the physical layer of the receiving side. The physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) circuit, and time and frequency are used as radio resources for the channel.

The medium access control layer (hereinafter referred to as “MAC”) located at the second level provides a service to its upper level, called the radio link control layer (hereinafter referred to as “RLC”) through the logical channel. The second level RLC layer supports reliable data communications. An RLC layer function can be implemented as a function block in a MAC layer. In this case, the RLC layer may not exist. The Layer 2 Protocol Packet Convergence Protocol (PDCP) layer is used to efficiently transmit IP packets, such as IPv4 or IPv6, in a radio section having a relatively small bandwidth. To this end, the PDCP layer performs a header compression function to reduce the size of the IP packet header, which is relatively large and includes redundant control information.

The radio resource control level (hereinafter referred to as “RRC”) located at the uppermost location of the third level is determined only in the control plane. The RRC layer assumes responsibility for managing the logical channels, transport channels, and physical channels with respect to the configuration, reconfiguration, and release of unidirectional channels (RB). Here, RB means a service provided by a second layer for performing data transfer between a UE and a UTRAN. When the RRC connection between the RRC layer of the UE and the RRC layer of the UTRAN is established, then the UE is in the RRC_CONNECTED state. Otherwise, the UE is in the RRC_IDLE state.

Downlink transport channels for transmitting data from the network to the UE may include a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting other user traffic or control messages. In the case of traffic or control messages of the downlink multicast or broadcast service, they can be transmitted either through the downlink SCH or through a separate downlink multicast channel (MCH). Alternatively, uplink transport channels for transmitting data from the UE to the network may include a random access channel (RACH) for transmitting an initial control message, and an uplink shared channel (SCH) for transmitting user traffic or control messages.

Logical channels that are at a higher level than the transport channels and are mapped to the transport channels may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), multicast traffic channel (MTCH) and the like.

A physical channel includes a plurality of subframes located on a time axis and a plurality of subcarriers located on a frequency axis. Here, the subframe includes a plurality of symbols on a time axis. A subframe includes multiple resource blocks, with each block including multiple symbols and multiple subcarriers. Also, each subframe may use specific subcarriers of specific symbols (e.g., the first symbol) in a relevant subframe for a physical downlink control channel (PDCCH), i.e. control channel L1 / L2. A subframe has a duration of 0.5 ms. The transmission time interval (TTI) as a unit of time for data transmission is 1 ms, corresponding to two subframes.

Hereinafter, the RRC status and the RRC communication method of the UE will be described in detail. The RRC status refers to whether the RRC of the UE is logically connected to the RRC in the E-UTRAN. If connected, then the state is called RRC_CONNECTED, otherwise the state is called RRC_IDLE. For a UE in the RRC_CONNECTED state, the E-UTRAN can recognize the existence of a relevant UE in the cell node, because its RRC connection exists, and thus the E-UTRAN can efficiently manage the UE. In contrast, for UEs in the RRC_IDLE state, the E-UTRAN cannot recognize the relevant UE, and therefore, it is managed by the core network in a tracking territorial unit, which is a unit larger than a cell. In other words, the existence of a UE in the RRC_IDLE state is recognized only in a large territorial unit, and therefore, it must be changed to the RRC_CONNECTED state in order to receive typical mobile services, such as voice or data.

When the UE is first turned on by the user, the UE firstly searches for a suitable cell, and then pins in the RRC_IDLE state in the corresponding cell. The UE fixed in the RRC_IDLE state makes an RRC connection with an E-UTRAN RRC through an RRC connection procedure when an RRC connection is required, thereby changing the state to an RRC_CONNECTED state. There are several cases where an UE in an idle state needs to make an RRC connection. For example, it may be necessary to transmit data on an uplink due to a telephone conversation made by a user or the like, or it may be necessary to transmit a response message in response to a paging message received from an E-UTRAN.

The non-access level (NAS) located at the upper level of the RRC performs a function such as session management, mobility management and the like.

In order to manage the mobility of the UEs at the NAS level, both the status of the EPS mobility management-REGISTERED (EMM-REGISTERED) and the status of the EMM-REGISTERED are determined, and both states will be applied to the UE and the mobility management entity (MME). The UE is initially in an EMM-acquired state and is in the process of registering itself with the appropriate network through the 'initial join' procedure in order to gain access to the network. If this 'join' procedure was successful, then the UE and MME will be in the EMM-REGISTERED state.

In order to control the signaling connection between the UE and the EPC, both the EPS Connection Management (ECM) -IDLE state and the ECM-CONNECTED state are determined, and both states will apply to the UE and MME. If the UE in the ECM-IDLE state makes an RRC connection with the E-UTRAN, then it will be in the ECM-CONNECTED state. If the MME in the ECM-IDLE state is connecting S1 to the E-UTRAN, then it will be in the ECM-CONNECTED state. When the UE is in the ECM-IDLE state, the E-UTRAN does not have UE context information. Therefore, the UE in the ECM-IDLE state performs a mobility procedure based on the UE, such as cell selection or reselection without receiving a command from the network. Conversely, when the UE is in the ECM-CONNECTED state, the network team controls the mobility of the UE. If the location of the UE in the ECM-IDLE state changes from the location that was recognized by the network, the UE performs a territory tracking update procedure to notify the network of the corresponding location of the UE.

Next, system information will be described. System information includes information that a UE needs to have in order to access a base station. Therefore, the UE had to receive all the system information before accessing the base station, and also must have the latest system information at all times. Moreover, the base station periodically transmits system information, since system information must be communicated to each UE in the cell.

System information can be divided into MIB, SB, SIB and the like. The Main Information Unit (MIB) allows the UE to be notified of the physical architecture of the corresponding cell, for example, bandwidth and the like. A scheduling unit (SB) notifies of SIB transmission information, for example, a transmission period and the like. System Information Block (SIB) is a collection of interconnected system information. For example, a specific SIB includes only information about neighboring cells, and another specific SIB includes only information about the uplink radio channels used by the UE.

In the prior art, based on which US connection is allowed by the base station, the base station operating modes can be divided into several access modes. Here, the base station can organize a closed subscriber group in order to provide higher quality services for subscribers in the corresponding group. The base station delivers information, namely the CSG, in order to allow the UE to determine whether it operates in access mode (CSG cells), which allows access only for UEs belonging to a closed group of subscribers, or in access mode (typical or regular cell ), where there is no restriction that the UE should belong to a particular group.

However, in addition to the two types of access mode (CSG cell, typical cell), the base station may use a combination of the two types of access mode. When the base station operates in such a hybrid access mode, these three access modes cannot be appropriately classified using the access mode classification method with only the CSG indicator. In this case, there is a problem in that the UE may not receive CSG services from the base station, although it is a member of the CSG.

Disclosure of invention

Solution

Accordingly, it is an object of the present invention to provide a method for determining a cell access mode in a wireless communication system more efficiently than in the prior art.

In order to solve the aforementioned problem, a method for determining a cell access mode in a wireless communication system according to the present invention is characterized in that it includes the steps of determining whether a cell access mode is a first mode in which access to one or more UEs in specific subscriber groups is allowed only in the first mode; checking the existence of subscriber group identification, if it is determined that the access mode of the cell is not the first mode; and consider the cell access mode as the second mode, if a subscriber group identification exists in which access to the second mode is selectively allowed to one or more UEs in a particular subscriber group or to all UEs in the cell.

Also, in order to solve the aforementioned problem, a method for determining a cell access mode in a wireless communication system according to the present invention is characterized in that it includes the steps of determining whether a UE supports a particular cell access mode in which one or more UEs in a particular subscriber group or all UEs in a cell are selectively allowed access in a particular access mode; subscriber group identification verification, if it is determined that the UE supports a particular access mode; and checking the subscriber group identifier in order to determine the access mode of the cell, if it is determined that the UE does not support a specific access mode.

Also, in order to solve the aforementioned problem, a method for determining a cell access mode in a wireless communication system according to the present invention is characterized in that it includes the steps of providing information and subscriber group identification for the UE in order to determine a cell access mode in which the information indicates that the UE is not in a particular access mode, and the specific access mode allows access to only one or more UEs in a particular subscriber group.

According to the present invention, in order to recognize a cell type, the UE verifies the existence of a CSG identification in addition to the CSG indicator, thereby allowing the UE to distinguish the hybrid cell from other cell types. Moreover, according to the present invention, if it is verified by the UE that the cell is a hybrid cell, then in the case of the UE supporting CSG, the CSG can be further checked and the relevant (or corresponding) cell will be recognized as a CSG cell if it is a member of the CSG . Because of this, the present invention allows access to the UE as a member of the CSG if the UE is a member of the CSG in the hybrid cell.

In the present invention, if the UE ultimately recognizes the hybrid cell as a CSG cell to which the UE itself belongs as a member, then the UE may notify the network that the UE itself is a member of the target cell when trying to access the cell or transmit a request to handover to the network. Then, the network including the target cell may consider that the corresponding CSG member has a higher priority during access or handover based on a management policy. For example, when multiple UEs attempt to access or transfer service to a hybrid cell, resulting in contention, the network may give priority to CSG members, whereby providing higher quality services to a CSG member.

Brief Description of the Drawings

The accompanying drawings, which are included to provide an additional understanding of the invention, are included in and form part of this description of the invention, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

In the drawings:

1 is a view illustrating an E-UTRAN network architecture, which is a mobile communication system to which the related art and the present invention relate;

FIG. 2 is an exemplary view illustrating a control plane architecture in a radio interface protocol between a UE and an E-UTRAN in the prior art; FIG.

3 is an exemplary view illustrating a user plane architecture in a radio interface protocol between a UE and an E-UTRAN in the prior art;

4 is an exemplary view illustrating a procedure for operating a UE selecting a cell in a standby mode;

5 is an exemplary view illustrating an E-UTRAN network architecture for controlling an H (e) NB using a (GW) H (e) NB gateway;

6 is a first exemplary view illustrating a verification of an access mode of a base station by a UE according to the present invention;

7 is a second exemplary view illustrating a method for checking an access mode of a base station by a UE according to the present invention;

FIG. 8 is an exemplary view illustrating a process for connecting a UE of a CSG subscription member to a base station in a CSG cell (closed subscriber group);

Fig. 9 is an exemplary view illustrating a process for connecting to a base station of a UE that has a list of available CSGs but is not a member of a corresponding cell in a CSG cell (closed subscriber group);

10 is an exemplary view illustrating a process for connecting to a base station of a UE that does not have a list of available CSGs for a corresponding cell in a CSG cell (closed subscriber group);

11 is an exemplary view illustrating a process for connecting to a base page of each UE in a cell other than a CSG cell (closed subscriber group);

12 is an exemplary view illustrating a process for connecting to a base page of a UE of a CSG subscription member in a hybrid cell; and

13 is an exemplary view illustrating a process for connecting to a base page of a non-CSG subscribed UE in a hybrid cell.

An embodiment of the invention

One aspect of the invention relates to the consideration by the present inventors of the problems of the prior art, as described above, and is further explained below. Based on this consideration, features of this invention have been developed.

Although this invention is shown to be implemented in a mobile communication system, such as, for example, UMTS designed according to 3GPP specifications, this invention can also be applied to other communication systems operating in accordance with other standards and specifications.

The present invention can be applied to 3GPP communication technology, and more specifically to a universal mobile telecommunications system (UMTS), system, communication device, and method thereof. However, the present invention is not limited to this and can be applied to any wired / wireless communication to which the technical nature of the present invention can be changed.

According to the basic concept of the present invention, there is provided a method for determining a cell access mode for wireless communication, and a UE (or terminal) for wireless mobile communication is proposed, capable of performing such a method, which is characterized in that it includes the steps of determining whether the cell access mode is the first mode, which one or more UEs in specific subscriber groups is allowed access only in the first mode; checking the existence of identification (identification information) of the subscriber group, if it is determined that the access mode of the cell is not the first mode; and evaluating the cell access mode as the second mode, if a subscriber group identification exists in which access to the second mode is selectively allowed to one or more UEs in a particular subscriber group or to all UEs in the cell.

Moreover, according to the present invention, there is provided a method for determining a cell access mode for wireless communication, and a wireless mobile communication UE is proposed that can perform such a method, which is characterized in that it includes the steps of determining whether the UE supports a particular cell access mode in which or more UEs in a particular subscriber group or all UEs in a cell are selectively allowed access in a particular access mode; subscriber group identification verification, if it is determined that the UE supports a particular access mode; and checking the subscriber group identifier in order to determine the access mode of the cell, if it is determined that the UE does not support a specific access mode.

According to the present invention, moreover, a method for determining a cell’s access mode for wireless communication is provided, and a network is provided that allows for the implementation of such a method, which is characterized in that it includes the steps of providing information and subscriber group identification for a UE in order to determine a cell’s access mode , in which the information indicates that the UE is not in a particular access mode, and the specific access mode allows access to only one or more UEs in a particular subscriber group.

Hereinafter, the configuration and operation of the preferred embodiments according to the present invention will be described with reference to the accompanying drawings.

In general, the network services provided by the UE can be divided into three types, as follows. Moreover, the UE may recognize the type of cell in another way, based on what service can be received. First, a type of service will be described, and then a cell type will be described below.

1) Limited service: This service provides an emergency call and earthquake and tsunami warning system (ETWS) and can be provided in an acceptable cell.

2) Ordinary service: this service means public use of general purpose and can be provided in a suitable or regular cell.

3) Operator service: this service means a service for operators of communication network services, and this cell can only be used by operators of communication network services, but cannot be used by typical users.

Considering the types of services provided by the hundredth, the types of cells may be divided as follows.

1) Acceptable Cell: A cell in which a UE may receive a limited service. This cell is not prohibited and satisfies the cell selection criteria of the UE from the point of view of the corresponding UE.

2) Suitable cell: a cell in which the UE may receive normal service. This cell will satisfy the condition of an acceptable cell, but at the same time satisfy additional conditions. For additional conditions, the cell must be attached to the PLMN, for which the corresponding UE may be available, and it should be a cell in which the implementation of the procedure for updating the monitored territory is not prohibited. If the relevant (or corresponding) cell is a CSG cell, then it must be a cell to which the UE can be accessed as a CSG member.

3) Prohibited cell: A cell broadcasting through system information that it is a prohibited cell.

4) Reserved cell: A cell broadcasting through system information that it is a reserved cell.

4 is a view illustrating the operation of a UE selecting a cell in a standby mode.

In a first step, the UE selects a radio access technology (hereinafter referred to as “RAT”) to maintain communication with a public land mobile communication network (hereinafter referred to as “PLMN”), from which the UE itself wishes to receive the service. The PLMN and RAT information can be selected by the user of the UE, and what is stored in USIM can also be used.

In a second step, the UE selects the cell having the highest value among the cells so that the measured base station has a value greater than a specific value of signal strength and quality. Then it receives the SI sent by the base station. The specific value indicates the value determined by the system to guarantee the quality of the physical signals when transmitting and / or receiving data. Accordingly, the value may vary based on the RAT to be applied.

In a third step, the UE registers its own information (e.g., IMSI) for receiving services (e.g., paging calls) from the network. Here, the UE is not registered in the network, which will be accessed every time a cell is selected, but is registered in the network when the network information received from the SI (for example, tracking area identification (TAI)) is different from the network information that it has UE itself.

In the fourth step, if the signal strength and quality value measured by the base station from which the UE receives the service is less than the value measured by the base station of the neighboring cell, then the UE selects one of the other cells providing signals having better characteristics than the characteristics of the base cell the station accessed by the UE. This process is called cell reselection to distinguish it from the initial cell selection in the second step. At this point, a time limit condition may be set in order to prevent multiple cell reselection based on a change in signal characteristics.

The following describes in detail the procedure for selecting a UE cell. If the UE is turned on, then the UE must follow the preparations for selecting a cell having a suitable quality for receiving a service.

The UE in the RRC_IDLE state must select a cell that is constantly of suitable quality, and thus be ready to receive services through the cell. For example, a UE that has just been turned on must select a cell having the appropriate quality to be registered on the network. If the UE that was in the RRC_CONNECTED state transitions to the RRC_IDLE state, then the UE must select a cell in which the UE itself is fixed. Thus, the process of selecting a cell satisfying a predetermined condition by the UE in order to be fixed in the service standby state, such as in the RRC_IDLE state, is called cell selection. The cell selection is performed in a state such that the UE does not currently determine the cell in which the UE itself is fixed in the RRC_IDLE state, and therefore, it is very important to select the cell as quickly as possible. Therefore, if it is a cell providing a radio signal quality greater than a predetermined level, then it can be selected during the cell selection process of the UE, even if the cell is not a cell providing the best radio signal quality.

Hereinafter, a method and procedure for selecting a UE LTE cell is described in detail. If the power is initially turned on, the UE searches for available PLMNs and selects the appropriate PLMN to receive the service. Then, the UE selects a cell having signal quality and characteristics capable of receiving a suitable service among the cells provided by the selected PLMN. Here, the cell selection process can be advantageously divided into two types. The first type is the initial cell selection process, and in this process the UE does not have previous radio channel information. Therefore, the UE searches all the radio channels in order to find a suitable cell. In each channel, the UE searches for the strongest cell. Then, if a suitable cell satisfying the selection criteria is found, then the UE selects the corresponding cell. Another type is a cell selection process using the stored information, and in this process, the UE uses the radio channel information stored in the UE, or selects the cell using information transmitted in a broadcast manner from the cell. Accordingly, the cell can be quickly selected in comparison with the initial cell selection process. If a cell satisfying the cell selection criteria is found, then the UE selects the corresponding cell. If a cell satisfying the cell selection criterion is not found, then the UE performs the initial cell selection process.

The cell selection criteria of the UE in the cell selection process may be represented by the formula in the following Table 1.

Table 1
Criterion for cell selection by UE in LTE Cell Selection Criteria: Srxlev> 0
Here Srxlev = Q _rxlevmeas - (Q _rxlevmin + Q _rxlevoffset ) -Pcompensation

The parameters used in the above cell selection criteria are as follows:

- Q _rxlevmeas - measured cell reception level (RSRP)

- Q _rxlevmin - minimum required level of reception in a cell (dBm)

- Q _rxlevoffset - offset to Q _rxlevmin (offset)

- Pcompensation max (P _EMAX - P _UMAX , 0) (dB)

- P _EMAX - maximum transmit power allowed by the UE in the corresponding cell (dBm)

- P _UMAX - maximum transmit power of the radio transmission unit (RF) of the UE based on the performance of the UE (dBm)

In the above Table 1, it can be seen that the UE selects a cell having a measured signal strength and signal quality value greater than a specific value set by the service providing cell. Moreover, the parameters used in the above Table 1 are broadcast through the system information, and the UE receives these parameter values to use them for the cell selection criterion.

If the UE selects a cell that satisfies the cell selection criteria, then the UE receives the information required for the RRC_IDLE UE in the corresponding cell from the system information of the corresponding cell. The UE receives all the information required for the RRC_IDLE mode of operation, and then waits in standby mode to request a service (e.g., an outgoing call) from the network or receive a service (e.g., an incoming call) from the network.

After the UE selects a specific cell through the cell selection process, the signal strength and quality between the UE and the base station can be changed due to the mobility of the UE and the change in the wireless environment. Therefore, if the quality of the selected cells deteriorates, then the UE may choose another cell providing better quality. Thus, if the cell is reselected, then typically the cell providing the signal quality is better than the quality of the currently selected cell. This process is called cell reselection. The primary objective of a cell reselection process typically is to select a cell providing the best quality for the UE from a radio signal quality perspective. In addition to the radio signal quality position, the network can notify the UE of priority by defining it for each frequency. The UE that has accepted the priority may consider this priority in first place compared to the radio signal quality criterion during the cell reselection process.

As described above, there is a method for selecting or reselecting a cell based on signal characteristics of the wireless equipment. When a cell is reselected, when selecting a cell for reselection, there may be methods for re-selecting a cell, as described below, based on radio access technology (hereinafter referred to as “RAT”) and cell frequency characteristics.

- Intra-frequency reselection: a cell having a center frequency similar to a RAT similar to a cell currently used by a UE is re-selected.

- Inter-frequency reselection: a cell having a center frequency other than RAT similar to the cell currently used by the UE is reselected.

- Cell reselection among RATs: a cell is re-selected using a different RAT from the RAT currently being used by the UE.

On the other hand, 3G or advanced packet system services can be provided through a base station owned by an individual, a particular service provider, or a group in addition to a mobile service provider. Such a base station is called home node B (HNB, HeNB). Hereinafter, both HNB and HeNB are commonly referred to as H (e) NB. Task H (e) NB essentially consists in providing specialized services only to a closed subscriber group (CSG). However, these services may be provided to other users in addition to the CSG based on setting the operation mode of H (e) NB.

5 is an exemplary view illustrating an E-UTRAN network architecture for controlling H (e) NB using a (GW) H (e) NB gateway.

As illustrated in FIG. 5, HeNBs can be connected to the EPC via the GW HeNB or directly connected to the EPC. Here GW HeNB is considered a typical eNB for MME. GW HeNB is also considered an MME for HeNB. Therefore, the Si interface is connected between the HeNB and the HeNB GW, and the Si interface is connected between the HeNB GW and the EPC. Moreover, even in the case of a direct connection between HeNB and EPC, they are connected via the Si interface. The functionality of the HeNB is almost similar to the functionality of a typical eNB.

Typically, H (e) NB has lower output radio transmit power compared to (e) NB owned by mobile service providers. Therefore, coverage with the service provided by H (e) NB is typically less than coverage with the service provided by (e) NB. Due to these characteristics, a cell provided by H (e) NB is classified as a femtocell, as opposed to a macro cell provided by (e) NB, from a service coverage perspective. On the other hand, from the point of view of the services provided, when H (e) NB provides these services only to the CSG group, the cell provided by this H (e) NB is called the CSG cell.

Each CSG has its own identification number, and this identification number is called the CSG ID (CSG Identification). The UE may have a CSG list to which the UE itself belongs as a member, and this CSG list may be modified by a UE request or a network command. Typically, one H (e) NB may support one CSG.

H (e) NB delivers the CSG owned by the CSG, supported by itself, through system information, thereby allowing access to only the corresponding UE CSG member. When a CSG cell is found by a UE, such a type of CSG being supported by this CSG cell can be verified by reading the CSG ID included in the system information. A UE that has read the CSG ID considers the corresponding cell to be an available cell only if the UE itself is a member of the corresponding CSG cell.

For H (e) NB, it is not always required to allow access only to the CSG UE. Based on the configuration of the H (e) NB, access to a non-CSG UE may be allowed. The type of UE to which access is allowed can be changed based on the configuration setting of H (e) NB. Here, the configuration setting means setting the operating mode H (e) NB. The operation mode of H (e) NB can be divided into three types, as follows, based on the type of UE.

1) Closed access mode: a mode in which services are provided only to specific CSG members. Cell CSG is provided by H (e) NB.

2) Open access mode: a mode in which services are provided without any restriction to specific CSG members, like a typical (e) NB.

3) Hybrid access mode: a mode in which CSG services are provided to specific CSG members as well as services are provided to non-CSG members, like a typical cell. It is recognized as a CSG cell for a UE of a CSG member and is recognized as a typical cell for a UE that is not a CSG member. Such a cell is called a hybrid cell.

The H (e) NB notifies the UE that the cell served by it is a CSG cell or a typical cell, allowing the UE to know whether access to the corresponding cell can be obtained. H (e) NB, controlled in a closed access mode, broadcasts through system information that it is a CSG cell. Thus, H (e) NB allows the system information to include a single bit CSG indicator indicating whether or not the cell served by itself is a CSG cell in the system information. For example, a CSG cell broadcasts by setting the CSG pointer to TRUE (true). If the cell being served is not a CSG cell, then a method can be used so that the CSG pointer can be set to FALSE, or transmission of the CSG pointer is neglected. The UE must distinguish the typical cell provided by (e) NB from the CSG cell, and thus, the typical (e) NB may also transmit a CSG pointer (e.g., FALSE), thereby letting the UE know that the type of cell provided by it, is a typical hundredth. Moreover, a typical (e) NB may not transmit a CSG pointer, thus letting the UE know that the cell type provided by it is also a typical cell. The CSG related parameters are transmitted by the corresponding cell for each type of cell shown in Table 2. Then, the types of UEs to which access is allowed for each type of cell are presented in Table 3.

table 2
CSG related parameters included in system information for each cell type Honeycomb csg Typical honeycomb CSG pointer "CSG honeycomb" indicated "Non-CSG cell" indicated or not transmitted CSG Identification Supported CSG Authentication Passed Not transferred

Table 3
The type of UE to which access is allowed for each cell type Honeycomb csg Typical honeycomb Non-CSG UE Access is denied Access is allowed Non-CSG UE Access is denied Access is allowed UE member CSG Access is allowed Access is allowed

6 is a first exemplary view illustrating a method for checking an access mode of a base station by a UE according to the present invention.

In a first step, the UE first checks the CSG pointer in the system information of the target cell in order to check the type of the target cell. After checking the CSG, and then in the second step, if the CSG indicates that the target cell is a CSG cell, the UE recognizes the corresponding cell as a CSG cell. Then, the UE checks the CSG identification or CSG identifier in the system information in order to check whether or not the UE itself is a CSG member of the target cell. If it is determined from the CSG identification that the UE is a member of the CSG of the target cell, then the corresponding cell will be recognized as an available CSG cell.

If it is determined from the CSG identification that the UE is not a CSG member of the target cell, then the corresponding cell will be recognized as an inaccessible CSG cell. If the CSG indicates that the target cell is not a CSG cell in a first step, then the UE recognizes the target cell as a typical cell. Moreover, if the CSG is not transmitted in the first step, the UE recognizes the target cell as a typical cell.

In general, CSG cells and macro cells can be simultaneously controlled at a particular frequency. This frequency is called mixed carrier frequency. The network may reserve specific physical layer CSG identifications in a mixed carrier frequency for CSG cells. The physical layer CSG identification is called the physical cell identification (PCI) in the E-UTRAN and is called the physical scrambling code (PSC) in the UNTRAN. For the convenience of explanation, the identification of the physical layer CSG will be represented as PCI. At the mixed carrier frequency, the CSG cell reports PCI information reserved for the CSG at the current frequency through system information. The UE that has received this information may determine whether or not this cell is the CSG cell of the PCI cell when a specific cell is found at the corresponding frequency. Below we will illustrate how this information is used by the UE in the case of two types of UEs.

First, in the case of a UE that does not support a CSG function or does not have a CSG list to which the UE itself belongs, the UE does not need to consider the CSG cell as capable of selecting a cell during the cell selection / reselection process. In this case, the UE only checks the PCI cells, and then the UE can immediately exclude the corresponding cell during the cell selection / reselection process if the PCI is a PCI reserved for CSG. Typically, the PCI of a particular cell may become known immediately during the process of verifying the existence of a corresponding cell in the physical layer by the UE.

Secondly, in the case of a UE having a CSG list to which the UE itself belongs, when the UE wants to know the list of neighboring CSG cells, at the mixed carrier frequency it may be known that the corresponding cell is a CSG cell, if only a cell having PCI is found, reserved for CSG, instead of individually checking the CSG identification of the system information of each cell found on the entire PCI range.

As described above, when H (e) NB operates using either one of two methods, open access mode or closed access mode, it is sufficient to broadcast a single bit CSG pointer using H (e) NB in order to distinguish between the two modes. from friend. Also, in the case of a typical (e) NB, the UE determines whether the corresponding cell is a CSG cell or a typical cell through a CSG indicator transmitted from the base station.

However, H (e) NB may be controlled in a hybrid access mode in addition to an open access mode or a closed access mode. If H (e) NB is controlled in a hybrid access mode, then the cell provided by H (e) NB should be presented as a CSG cell for a member UE and as a typical cell for a non-member UE. However, if H (e) NB is controlled in a hybrid access mode, then there is a problem of what value the CSG pointer should be set to. How cell identification is changed based on the setting of the CSG pointer will be considered from the perspective of the UE.

If the CSG is set to the CSG cell by H (e) NB, then a UE that does not support CSG or does not have a list of available CSGs recognizes the hybrid cell as a CSG cell with this pointer and therefore does not attempt to access the cell. Therefore, access to the hybrid cell by a non-member UE will be blocked. In this case, the corresponding cell is no longer a hybrid cell and works like a CSG cell, allowing access only to the UE to the CSG member.

Accordingly, the CSG identification of the hybrid cell is set to a non-CSG cell because the hybrid cell should be represented as a typical cell for a non-member UE and a non-CSG supporting UE. However, if, therefore, the CSG is set to a non-CSG cell by H (e) NB, then the UE recognizes the hybrid cell as a typical cell through this pointer and, therefore, attempts to access the cell. At this time, it may not be known to the network whether the UE attempting to access is a CSG member of the corresponding cell because the UE has not considered whether or not the UE itself is a CSG member. As a result, the corresponding H (e) NB cannot provide better quality services for the CSG member UE compared to the non-CSG UE. Here, an access attempt may also include a handover process. For example, a circumstance may be considered in which a UE member of a CSG of a particular hybrid cell notifies the base station that is currently being serviced by the hybrid cell as the target cell to transfer service in order to transfer service to this hybrid cell. At this time, although the UE is a CSG member of the corresponding hybrid cell, the UE determines that the corresponding cell is a typical cell if the CSG indicates that it is not a CSG cell and does not notify that the UE itself is a CSG member of the target cell. As described above, even if the UE member of the CSG of a particular hybrid cell transmits service to the hybrid cell, it is not known for the network that the UE is a CSG member of the corresponding target hybrid cell, and thus services cannot be provided with a difference from other UEs, not being members. In other words, in the existing method for determining the type of cell with a CSG pointer only, specialized hybrid access service services cannot be provided, only in which CSG services are provided to a particular CSG member and only in which services like a typical cell are provided only to non-CSG members.

Therefore, the present invention provides a method for allowing a UE to check which mode is currently controlled by H (e) NB among open / closed / hybrid access modes through a CSG pointer and CSG identification. Moreover, if during the access process the H (e) NB is verified by the UE that the H (e) NB is hybrid access controlled using the above method, then the present invention provides a method for verifying whether the corresponding hybrid cell should be considered a hundredth CSG or typical hundredth.

In the present invention, the hybrid access control H (e) NB sets the CSG pointer of the hybrid cell to a non-CSG cell and then transmits it, and thus the hybrid cell is represented as a typical cell through this CSG pointer value for a UE that does not support CSG. However, the hybrid cell may provide CSG services for the UE of the CSG member and therefore transmits the CSG ID. Accordingly, setting the CSG related parameter values for each cell type is presented in the following Table 4.

Table 4
CSG related parameters included in system information for each cell type Honeycomb csg Typical honeycomb Hybrid honeycomb CSG pointer Honeycomb
CSG indicated A non-CSG cell is indicated or not transmitted "Non-CSG cell" indicated or not transmitted CSG Identification Supported Authentication
CSG transferred Not transferred Supported CSG Authentication Passed

Then, Table 5 presents the type of UE and the type of access to which access is allowed for each type of cell.

Table 5
The type of UE to which access is allowed for each cell type Honeycomb csg Typical honeycomb Hybrid honeycomb Non-CSG UE Access is denied Access Granted (Typical Access) Access Granted (Typical Access) Non-CSG UE Access is denied Access Granted (Typical Access) Access Granted (Typical Access) UE member CSG Access Granted (CSG Access) Access Granted (Typical Access) Access Granted (CSG Access)

7 is a second exemplary view illustrating a method for checking a UE access mode to a base station according to the present invention. 7 illustrates a UE procedure for further recognizing a hybrid cell, and if it is a hybrid cell, then to check whether or not it is a CSG member of the corresponding cell, whereby, in particular, determining the type of cell. The procedure will be described in detail below.

In a first step, the UE first checks the CSG pointer in the system information of the target cell in order to check what the type of the target cell is. After checking the CSG indicator and then in the second step, if the CSG indicator indicates that the target cell is a CSG cell, then the UE recognizes the corresponding cell as the CSG cell. The UE then checks the CSG identification in the system information in order to verify that the UE itself is a member of the CSG of the target cell. If it is determined from the CSG identification that the UE itself is a member of the CSG of the target cell, then the corresponding cell will be recognized as an available CSG cell, and if it is determined from the CSG that the UE is not a member of the CSG of the target cell, then the corresponding cell will be considered unavailable by the cell .

If the CSG indicates that the target cell is not a CSG cell in a first step, then the UE checks whether or not the target cell transmits the CSG identification. Then, if it is determined that the CSG identification has been transmitted, then the UE recognizes the target cell as a hybrid cell and checks the CSG identification of the corresponding cell to check whether the UE itself is a CSG member of the target cell, and if it is determined that the UE is a CSG member of the target cell, then The UE recognizes the corresponding cell as an available cell, and then notifies the network of this circumstance. However, if it is determined that the UE is not a CSG member of the target cell when the UE recognizes the corresponding cell as a typical cell, then notifies the cell of this circumstance. If it is determined that the CSG is not transmitted during the CSG identity verification process, then the UE recognizes the target cell as a typical cell.

FIG. 8 is an exemplary view illustrating a process of connecting a UE of a CSG subscription member to a base station in a CSG cell (closed subscriber group).

In a first step, the UE receives system information including a CSG and CSG identification from a base station. Here, system information may be received through various control channels, such as a broadcast control channel (BCCH). After receiving the CSG and CSG identification, the UE first checks the received CSG to verify that the target cell for access is the CSG cell, and if it is determined that the target cell for access is the CSG cell, when the UE checks the received CSG identification for verification, is or if the UE itself is not a CSG member of the target cell, then it starts to take action to be connected as a CSG member. In other words, an initial connection process (e.g., RACH procedure) will be performed between the UE and the base station.

9 is an exemplary view illustrating a process of connecting to a base station of a UE that has a list of available CSGs but is not a member of the corresponding cell in the CSG cell (closed subscriber group).

First, the UE receives system information including a CSG indicator and CSG identification from a base station. Then, the UE first checks the received CSG to verify that the target cell for access is a CSG cell, and if it turns out that the target cell for access is a CSG cell, then the UE checks the received CSG identification to check whether the UE itself is a target CSG member honeycombs. However, as a result of the CSG identification check, it turns out that the UE itself is not a CSG member of the target cell and, therefore, the UE considers the target cell to be a restricted cell and does not perform the initial connection process between the UE and the base station.

10 is an exemplary view illustrating a process for connecting to a base station of a UE that does not have a list of available CSGs for a corresponding cell in a CSG cell (closed subscriber cell).

First, the UE receives system information including a CSG indicator and CSG identification from a base station. Then, the UE first checks the received CSG to verify that the target cell for access is the CSG cell. However, the UE does not have an available list for the corresponding cell, and therefore, the UE considers the target cell to be a restricted access cell and does not perform the initial connection process between the UE and the base station.

11 is an exemplary view illustrating a process for connecting a base station to each UE in a cell other than a CSG cell (closed subscriber group).

First, the UE receives system information including a CSG indicator from the base station. Then, the UE checks the received CSG to verify that the target cell for access is the CSG cell. Following the verification procedure, it is verified that the target cell for access is a typical cell, and therefore, the UE considers the target cell for access a typical cell and performs the initial connection process between the UE and the base station. Finding out if the target cell is a typical cell can be done by not sending a CSG pointer in the system information from the base station. In other words, if it is determined that information for the CSG pointer in the system information received from the base station does not exist, then the UE considers the target cell to be a typical cell and performs the initial connection process between the UE and the base station.

12 is an exemplary view illustrating a process for a base station UE to join a CSG subscription member in a hybrid cell.

First, the UE receives system information including a CSG indicator and CSG identification from a base station. Then, the UE checks that the target cell for access is a hybrid cell based on the received CSG and CSG identification. Then, the UE verifies that the UE itself is a member of the CSG of the target cell based on the received CSG identification, and if this is the case, then performs the initial connection process as a CSG member between the UE and the base station. Here, if the CSG is not included in the received system information, then the UE considers the target cell to be a typical cell and performs the initial process of connecting to the base station.

13 is an exemplary view illustrating a procedure for a base station UE to join a CSG subscription member in a hybrid cell.

First, the UE receives system information including a CSG indicator and CSG identification from a base station. Then, the UE checks that the target cell for access is a hybrid cell based on the received CSG and CSG identification. The UE then verifies that the UE itself is a member of the CSG of the target cell based on the received CSG identification, and if this is true, then the UE considers the target cell to be a typical cell and performs the initial process of connecting to the base station. Here, if the CSG is not included in the received system information, then the UE considers the target cell as a typical cell and performs the initial process of connecting to the base station.

The present invention can provide a method for determining a cell access mode in a wireless communication system, the method comprising: determining whether the cell access mode is a first mode in which access to one or more user equipments (UEs) in a particular subscriber group is permitted only in the first mode; checking the existence of subscriber group identification, if it is determined that the access mode of the cell is not the first mode; and considering the cell access mode as a second mode, if there is a subscriber group identification in which access to one or more user equipment in a particular subscriber group or to all UEs is selectively allowed in the second mode, in which the cell in the first mode is a CSG cell (closed subscriber group), and the cell in the second mode is a hybrid cell, the cell type indicator is used to determine whether the cell access mode is the first mode or not, the cell type indicator is a CSG indicator ( Closing the user group), the identification of the subscriber group identification is CSG, and the hybrid cell has a CSG indicator, installed in the 'FALSE' (false), and broadcasts the CSG identification.

It can also be said that the present invention can provide a method for determining a cell access mode in a wireless communication system, the method comprising: determining whether the UE supports a particular cell access mode in which one or more UEs in a particular subscriber group or all UEs in a cell access is allowed selectively in a particular access mode; subscriber group identification verification, if it is determined that the UE supports a particular access mode; and checking a subscriber group indicator to determine a cell access mode, if it is determined that the UE does not support a specific access mode in which a cell in a particular access mode is a hybrid cell, the subscriber group identification is a CSG (closed subscriber group) identification and subscriber pointer group is a pointer CSG (closed subscriber group).

It can also be said that the present invention can provide a method for determining a cell access mode in a wireless communication system, the method comprising: providing information and identifying a subscriber group to the UE in order to determine a cell access mode in which the information indicates that the UE is not in a particular access mode, and a particular access mode allows access to only one or more UEs in a particular subscriber group, and the cell in a particular access mode is a hundredth CSG (closed subscriber group ), information indicating that the UE is not in a specific access mode is provided to the UE by transmitting a subscriber group indicator, the subscriber group indicator is set to 'FALSE' (false), and information indicating that the UE is in a specific access mode is provided to UE by the fact that the dial plan indicator is not transmitted.

Hereinafter, a terminal according to the present invention will be described.

A terminal according to the present invention may include all types of terminals capable of using services that can transmit and / or receive data to and / or from each other in a wireless environment. In other words, the terminal according to the present invention can be used in a wide sense, including a mobile communication terminal (for example, user equipment (UE), portable telephone, cellular telephone, DMV telephone, DVB-H telephone, PDA telephone, PTT telephone and the like), laptop, portable computer, digital TV, GPS navigation, portable gaming device, MP3, other household appliances and the like.

A terminal according to the present invention may include a basic hardware architecture (a transmit and / or receive unit, a processing or control unit, a storage device and the like) required to perform a function and work to efficiently receive system information, as illustrated in the present invention.

The method according to the present invention, as described above, can be implemented by software, hardware, or a combination thereof. For example, the method according to the present invention can be stored on a storage medium (e.g., internal memory, flash memory, hard disk, and the like in a mobile terminal or base station) and can be implemented through codes and instructions in a program implemented by software, which may be implemented by a processor (e.g., a microprocessor in a mobile terminal or base station) and the like.

Although the present invention has been described in the context of mobile communications, the present invention can also be used in any wireless communication systems using mobile devices such as PDAs (personal digital assistants) and travel computers equipped with wireless capabilities (i.e., an interface ) Moreover, the use of certain terms to describe the present invention is not intended to limit the scope of the present invention to a particular type of wireless communication system. The present invention is also applicable to other wireless communication systems using different air interfaces and / or physical layers, for example, TDMA, CDMA, FDMA, WCDMA, OFDM, EV-DO, Wi-Max, Wi-Bro and so on.

Exemplary embodiments may be implemented as a method, device, or product using standard programming and / or design techniques to create software, firmware, hardware, or any combination thereof. The term "product" as used in the materials of this application refers to a code or logic implemented in hardware logic (for example, integrated circuit, programmable gate array (FPGA), specialized integrated circuit (ASIC), etc.) or computer-readable medium ( e.g. magnetic storage media (e.g. hard disk drives, floppy disks, tape, etc.), optical storage devices (CD-ROMs, optical disks, etc.), volatile and non-volatile storage devices (e.g. ES ROM, ROM, RAM, dynamic RAM, RAM, firmware, programmable logic, etc.)).

Code on a machine-readable medium may be accessible and executed by the processor. Code in which exemplary embodiments are implemented may additionally be available through a transmission medium or from a file server over a network. In such cases, the product in which the code is implemented may comprise a transmission medium, such as a network transmission line, a wireless transmission medium, signals propagating through space, radio waves, infrared signals, etc. Of course, those skilled in the art will recognize that many modifications can be made with respect to this configuration without departing from the scope of the present invention, and that the product may contain any information transfer medium known in the art.

Since the present invention can be implemented in various forms without departing from the essence and essential characteristics of the invention, it should be understood that the above-described embodiments are not limited to any elements of the foregoing description, unless otherwise indicated, but should be interpreted in a broad sense, within the essence and volume, as defined in the attached claims, and therefore all changes and modifications that fall within the scope and scope of the claims or equivalent The equivalent of such boundaries and limits are intended to be embraced by the appended claims.

Claims (15)

1. A method for determining the type of cell in a wireless communication system, the method comprising the steps of:
determining the cell as a hybrid cell when the cell type indication bit is set to 'FALSE' (false), but broadcasting the subscriber group identification information,
wherein one or more user equipments (UEs) in a particular subscriber group or all UEs in a cell are selectively allowed access in said hybrid cell, and
wherein the hybrid cell is considered by the UE as a closed subscriber group (CSG) cell when the identity of the subscriber group of the hybrid cell belongs to the allowed closed subscriber group (CSG) list of said UE. 2. The method according to claim 1, in which the cell type indication bit is a CSG (closed subscriber group) indication bit. 3. The method of claim 1, wherein the subscriber group identification information is CSG identification information. 4. The method according to claim 1, in which the hybrid cell is considered by all other UEs as a regular cell when the subscriber group identification information of said hybrid cell does not belong to the allowed CSG list of said UE. 5. The method according to claim 1, in which the CSG cell allows access to only one or more UE equipment in a particular subscriber group. 6. A method for determining the type of cell in a wireless communication system, the method comprising the steps of:
providing a cell type indication bit and / or subscriber group identification information to a user equipment (UE) for determining a cell type by this UE,
wherein the cell type is considered as a hybrid cell when the cell type indication bit is set to 'FALSE' (false), but the subscriber group identification information is broadcast,
wherein one or more user equipments (UEs) in a particular subscriber group or all UEs in a cell are selectively allowed access in said hybrid cell, and
wherein the hybrid cell is considered by the UE as a closed subscriber group (CSG) cell when the subscriber group identification information of this hybrid cell belongs to the allowed closed subscriber group (CSG) list of said UE. 7. The method according to claim 6, in which the indication bit type of the cell of the subscriber group is a bit indication CSG (closed subscriber group). 8. The method of claim 6, wherein the subscriber group identification information is CSG identification information. 9. The method according to claim 6, in which the hybrid cell is considered by all other UEs as a regular cell, when the subscriber group identification information of said hybrid cell does not belong to the allowed CSG list of said UE. 10. The method according to claim 6, in which the CSG cell allows access to only one or more UE equipment in a particular subscriber group. 11. A device for determining the type of cell in a wireless communication system, the device comprising:
a receiving unit configured to receive a cell type indication bit and / or subscriber group identification information,
a control unit configured to define the cell as a hybrid cell when the cell type indication bit is set to 'FALSE' (false), but the subscriber group identification information is broadcast,
wherein one or more user equipments (UEs) in a particular subscriber group or all UEs in a cell are selectively allowed access in said hybrid cell, and
wherein the hybrid cell is considered by the UE as a closed subscriber group (CSG) cell when the subscriber group identification information of said hybrid cell belongs to the allowed closed subscriber group (CSG) list of said UE. 12. The device according to claim 11, in which the indication bit type of the subscriber group cell is the indication bit CSG (closed subscriber group). 13. The device according to claim 11, in which the subscriber group identification information is CSG identification information. 14. The device according to claim 11, in which the hybrid cell is considered by all other UEs as a normal cell when the subscriber group identification information of said hybrid cell does not belong to the allowed CSG list of said UE. 15. The device according to claim 11, in which the CSG cell allows access to only one or more UE equipment in a particular subscriber group.

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