WO2014035154A1 - 무선 통신 시스템에서 자율적 서빙 셀 관리를 기반으로 한 통신 방법 및 이를 지원하는 장치 - Google Patents
무선 통신 시스템에서 자율적 서빙 셀 관리를 기반으로 한 통신 방법 및 이를 지원하는 장치 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Definitions
- the present invention relates to wireless communication, and more particularly, to a communication method based on autonomous serving cell management by a terminal in a wireless communication system and an apparatus supporting the same.
- 3GPP LTE long term evolution
- UMTS Universal Mobile Telecommunications System
- 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- MIMO multiple input multiple output
- LTE-A 3GPP LTE-Advanced
- various communication techniques are provided to provide improved services.
- One of them is to configure a plurality of serving cells.
- One technique that is considered among methods for configuring a plurality of serving cells is carrier aggregation.
- Carrier aggregation is to perform communication using a plurality of carriers among the carriers supported in the wireless communication system.
- the radio resources used by the terminal when the terminal has a serving cell, the additional carrier is configured to the terminal is similar to the additional serving cell that can be used by the terminal is configured.
- carrier aggregation may be similar to that in which a plurality of serving cells are configured in a terminal. Accordingly, in providing an efficient service through one or more serving cells to a terminal, a communication method according to a manner in which a serving cell of the terminal is managed needs to be considered.
- the present invention has been made in an effort to provide a communication method based on autonomous serving cell management and a device supporting the same in a wireless communication system.
- a communication method performed by a terminal in a wireless communication system includes determining whether a serving cell management condition is satisfied and managing a cell set including at least one serving cell for the terminal according to the satisfied serving cell management condition.
- the serving cell management condition may include a first condition for deactivation or removal and a second condition for activation or addition.
- Managing the cell set may include deactivating the particular serving cell if a particular serving cell included in the cell set satisfies the first condition.
- Managing the cell set may include removing the specific serving cell from the cell set if a specific serving cell included in the cell set satisfies the first condition.
- Managing the cell set may include activating the particular serving cell if the particular serving cell included in the cell set and deactivated satisfies the second condition.
- Managing the cell set may include including the specific neighbor cell in the cell set if a specific neighbor cell satisfies the second condition.
- the specific serving cell may satisfy the first condition.
- the specific serving cell may satisfy the first condition.
- the first condition may be satisfied.
- RAT radio access technology
- the specific serving cell or the specific neighbor cell may satisfy the second condition.
- the specific serving cell or the specific neighbor cell when the measurement quality of the specific serving cell or the specific neighbor cell included in the serving cell set and deactivated is greater than or equal to the measurement quality of the other specific serving cell included in the serving cell set May satisfy the second condition.
- the second condition may be satisfied.
- the method may further include transmitting a serving cell management report message according to the serving cell set management to a network.
- the serving cell management report message may include identification information of at least one cell whose state is changed through the serving cell management and information indicating a management reason of the serving cell set.
- At least one serving cell for the terminal may be at least one cell configured in the terminal to provide a service through carrier aggregation.
- the method may further include receiving a service through at least one subcarrier from the at least one serving cell included in the cell set.
- the plurality of serving cells may include one macro cell and at least one small cell.
- the method may further include transmitting and receiving control information with the macro cell and transmitting and receiving data with the at least one small cell.
- a wireless device operating in a wireless communication system includes a radio frequency (RF) unit for transmitting and receiving a radio signal and a processor operatively coupled to the RF unit.
- the processor is configured to determine whether a serving cell management condition is satisfied and to manage a cell set including at least one serving cell for the wireless device according to the satisfied serving cell management condition.
- the terminal may autonomously manage the serving cell based on the serving environment of the serving cell and / or the neighboring cell.
- serving cells suitable for providing a service to a terminal can be adaptively configured, which enables a more efficient and efficient service to be provided to the terminal through one or more serving cell settings.
- the terminal may manage the autonomous serving cell based on whether the service is provided through another RAT based on the capability of the terminal.
- LTE cells may be unnecessarily set as a serving cell and stand by when providing services through other RATs, thereby enabling more efficient network operation.
- FIG. 1 shows a wireless communication system to which the present invention is applied.
- FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
- FIG. 3 is a block diagram illustrating a radio protocol structure for a control plane.
- FIG. 4 is a flowchart illustrating an operation of a terminal in an RRC idle state.
- FIG. 5 is a flowchart illustrating a process of establishing an RRC connection.
- FIG. 6 is a flowchart illustrating a RRC connection resetting process.
- FIG. 7 is a diagram illustrating a RRC connection reestablishment procedure.
- FIG. 8 is a flowchart illustrating a conventional measurement method.
- 11 shows an example of deleting a measurement object.
- FIG. 12 is a diagram illustrating an example of a carrier aggregation technique.
- FIG. 13 illustrates an autonomous serving cell management based communication method according to an embodiment of the present invention.
- FIG. 14 is a diagram illustrating an example of an autonomous serving cell management based communication method according to an embodiment of the present invention.
- 15 is a diagram illustrating another example of an autonomous serving cell management based communication method according to an embodiment of the present invention.
- 16 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- LTE Long Term Evolution
- the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
- the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
- the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
- eNB evolved-NodeB
- BTS base transceiver system
- access point and the like.
- the base stations 20 may be connected to each other through an X2 interface.
- the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
- S-GW Serving Gateway
- MME Mobility Management Entity
- EPC Evolved Packet Core
- EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
- the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
- S-GW is a gateway having an E-UTRAN as an endpoint
- P-GW is a gateway having a PDN as an endpoint.
- Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
- L2 second layer
- L3 third layer
- the RRC Radio Resource Control
- the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
- FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
- 3 is a block diagram illustrating a radio protocol structure for a control plane.
- the user plane is a protocol stack for user data transmission
- the control plane is a protocol stack for control signal transmission.
- a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
- the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
- MAC medium access control
- the physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
- OFDM orthogonal frequency division multiplexing
- the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
- the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
- RLC Radio Link Control
- RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
- QoS Quality of Service
- the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
- TM transparent mode
- UM unacknowledged mode
- Acknowledged Mode acknowledged mode
- AM Three modes of operation (AM).
- AM RLC provides error correction through an automatic repeat request (ARQ).
- the RRC (Radio Resource Control) layer is defined only in the control plane.
- the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
- RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
- PDCP Packet Data Convergence Protocol
- Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
- the functionality of the Packet Data Convergence Protocol (PDCP) layer in the control plane includes the transfer of control plane data and encryption / integrity protection.
- the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
- RB can be further divided into SRB (Signaling RB) and DRB (Data RB).
- SRB is used as a path for transmitting RRC messages in the control plane
- DRB is used as a path for transmitting user data in the user plane.
- the UE If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.
- the downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages.
- Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
- the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
- RACH random access channel
- SCH uplink shared channel
- BCCH broadcast control channel
- PCCH paging control channel
- CCCH common control channel
- MCCH multicast control channel
- MTCH multicast traffic
- the physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain.
- One sub-frame consists of a plurality of OFDM symbols in the time domain.
- the RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers.
- each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
- Transmission Time Interval is a unit time of subframe transmission.
- the RRC state refers to whether or not the RRC layer of the UE is in a logical connection with the RRC layer of the E-UTRAN. If connected, the RRC connection state is called. Since the UE in the RRC connected state has an RRC connection, the E-UTRAN can grasp the existence of the corresponding UE in a cell unit, and thus can effectively control the UE. On the other hand, the UE of the RRC idle state cannot be understood by the E-UTRAN, and is managed by the CN (core network) in units of a tracking area, which is a larger area unit than the cell. That is, the UE in the RRC idle state is identified only in a large area unit, and must move to the RRC connected state in order to receive a normal mobile communication service such as voice or data.
- CN core network
- the terminal When the user first powers on the terminal, the terminal first searches for an appropriate cell and then stays in an RRC idle state in the cell.
- the UE in the RRC idle state needs to establish an RRC connection, it establishes an RRC connection with the E-UTRAN through an RRC connection procedure and transitions to the RRC connected state.
- RRC connection procedure There are several cases in which the UE in RRC idle state needs to establish an RRC connection. For example, an uplink data transmission is necessary due to a user's call attempt, or a paging message is sent from E-UTRAN. If received, a response message may be sent.
- the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
- EMM-REGISTERED EPS Mobility Management-REGISTERED
- EMM-DEREGISTERED EMM-DEREGISTERED
- the initial terminal is in the EMM-DEREGISTERED state, and the terminal performs a process of registering with the corresponding network through an initial attach procedure to access the network. If the attach procedure is successfully performed, the UE and the MME are in the EMM-REGISTERED state.
- an EPS Connection Management (ECM) -IDLE state In order to manage a signaling connection between the UE and the EPC, two states are defined, an EPS Connection Management (ECM) -IDLE state and an ECM-CONNECTED state, and these two states are applied to the UE and the MME.
- ECM EPS Connection Management
- ECM-IDLE state When the UE in the ECM-IDLE state establishes an RRC connection with the E-UTRAN, the UE is in the ECM-CONNECTED state.
- the MME in the ECM-IDLE state becomes the ECM-CONNECTED state when it establishes an S1 connection with the E-UTRAN.
- the E-UTRAN does not have context information of the terminal.
- the UE in the ECM-IDLE state performs a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
- a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
- the terminal when the terminal is in the ECM-CONNECTED state, the mobility of the terminal is managed by the command of the network.
- the terminal In the ECM-IDLE state, if the position of the terminal is different from the position known by the network, the terminal informs the network of the corresponding position of the terminal through a tracking area update procedure.
- the system information includes essential information that the terminal needs to know in order to access the base station. Therefore, the terminal must receive all system information before accessing the base station, and must always have the latest system information. In addition, since the system information is information that all terminals in a cell should know, the base station periodically transmits the system information.
- the system information includes a master information block (MIB) and a scheduling block (SB). It is divided into SIB (System Information Block).
- MIB master information block
- SB scheduling block
- the MIB enables the UE to know the physical configuration of the cell, for example, bandwidth.
- SB informs transmission information of SIBs, for example, a transmission period.
- SIB is a collection of related system information. For example, some SIBs contain only information of neighboring cells, and some SIBs contain only information of an uplink radio channel used by the terminal.
- services provided by a network to a terminal can be classified into three types as follows.
- the terminal also recognizes the cell type differently according to which service can be provided. The following describes the service type first, followed by the cell type.
- Limited service This service provides Emergency Call and Tsunami Warning System (ETWS) and can be provided in an acceptable cell.
- ETWS Emergency Call and Tsunami Warning System
- Normal service This service means a public use for general use, and can be provided in a suitable or normal cell.
- This service means service for network operator. This cell can be used only by network operator and not by general users.
- the cell types may be classified as follows.
- Acceptable cell A cell in which the terminal can receive limited service. This cell is a cell that is not barred from the viewpoint of the terminal and satisfies the cell selection criteria of the terminal.
- Suitable cell The cell that the terminal can receive a regular service. This cell satisfies the conditions of an acceptable cell and at the same time satisfies additional conditions. As an additional condition, this cell must belong to a Public Land Mobile Network (PLMN) to which the terminal can access, and must be a cell which is not prohibited from performing a tracking area update procedure of the terminal. If the cell is a CSG cell, the terminal should be a cell that can be connected to the cell as a CSG member.
- PLMN Public Land Mobile Network
- Barred cell A cell that broadcasts information that a cell is a prohibited cell through system information.
- Reserved cell A cell that broadcasts information that a cell is a reserved cell through system information.
- 4 is a flowchart illustrating an operation of a terminal in an RRC idle state. 4 illustrates a procedure in which a UE, which is initially powered on, registers with a network through a cell selection process and then reselects a cell if necessary.
- the terminal selects a radio access technology (RAT) for communicating with a public land mobile network (PLMN), which is a network to be serviced (S410).
- RAT radio access technology
- PLMN public land mobile network
- S410 a network to be serviced
- Information about the PLMN and the RAT may be selected by a user of the terminal or may be stored in a universal subscriber identity module (USIM).
- USIM universal subscriber identity module
- the terminal selects a cell having the largest value among the measured base station and a cell whose signal strength or quality is greater than a specific value (Cell Selection) (S420). This is referred to as initial cell selection by the UE that is powered on to perform cell selection. The cell selection procedure will be described later.
- the terminal receives system information periodically transmitted by the base station.
- the above specific value refers to a value defined in the system in order to ensure the quality of the physical signal in data transmission / reception. Therefore, the value may vary depending on the RAT applied.
- the terminal performs a network registration procedure (S430).
- the terminal registers its information (eg IMSI) in order to receive a service (eg paging) from the network.
- IMSI information
- a service eg paging
- the terminal selects a cell, the terminal does not register to the access network, and if the network information received from the system information (e.g., tracking area identity; TAI) is different from the network information known to the network, the terminal registers to the network. do.
- the system information e.g., tracking area identity; TAI
- the terminal performs cell reselection based on the service environment provided by the cell or the environment of the terminal (S440).
- the terminal selects one of the other cells that provides better signal characteristics than the cell of the base station to which the terminal is connected if the strength or quality of the signal measured from the base station being service is lower than the value measured from the base station of the adjacent cell. do.
- This process is called Cell Re-Selection, which is distinguished from Initial Cell Selection of Step 2.
- a time constraint is placed. The cell reselection procedure will be described later.
- FIG. 5 is a flowchart illustrating a process of establishing an RRC connection.
- the terminal sends an RRC connection request message to the network requesting an RRC connection (S510).
- the network sends an RRC connection setup message in response to the RRC connection request (S520). After receiving the RRC connection configuration message, the terminal enters the RRC connection mode.
- the terminal sends an RRC Connection Setup Complete message used to confirm successful completion of RRC connection establishment to the network (S530).
- RRC connection reconfiguration is used to modify an RRC connection. It is used to establish / modify / release RBs, perform handovers, and set up / modify / release measurements.
- the network sends an RRC connection reconfiguration message for modifying the RRC connection to the terminal (S610).
- the UE sends an RRC connection reconfiguration complete message used to confirm successful completion of the RRC connection reconfiguration to the network (S620).
- PLMN public land mobile network
- PLMN is a network deployed and operated by mobile network operators. Each mobile network operator runs one or more PLMNs. Each PLMN may be identified by a mobile country code (MCC) and a mobile network code (MCC). The PLMN information of the cell is included in the system information and broadcasted.
- MCC mobile country code
- MCC mobile network code
- PLMN selection In PLMN selection, cell selection and cell reselection, various types of PLMNs may be considered by the terminal.
- HPLMN Home PLMN
- MCC Mobility Management Entity
- Equivalent HPLMN A PLMN that is equivalent to an HPLMN.
- Registered PLMN A PLMN that has successfully completed location registration.
- ELMN Equivalent PLMN
- Each mobile service consumer subscribes to HPLMN.
- HPLMN When a general service is provided to a terminal by HPLMN or EHPLMN, the terminal is not in a roaming state.
- a service is provided to a terminal by a PLMN other than HPLMN / EHPLMN, the terminal is in a roaming state, and the PLMN is called a VPLMN (Visited PLMN).
- PLMN public land mobile network
- PLMN is a network deployed or operated by a mobile network operator. Each mobile network operator operates one or more PLMNs. Each PLMN may be identified by a mobile country code (MCC) and a mobile network code (MCC). The PLMN information of the cell is included in the system information and broadcasted.
- MCC mobile country code
- MCC mobile network code
- the terminal attempts to register the selected PLMN. If the registration is successful, the selected PLMN becomes a registered PLMN (RPLMN).
- the network may signal the PLMN list to the UE, which may consider PLMNs included in the PLMN list as PLMNs such as RPLMNs.
- the terminal registered in the network should be reachable by the network at all times. If the terminal is in the ECM-CONNECTED state (same as RRC connected state), the network recognizes that the terminal is receiving the service. However, when the terminal is in the ECM-IDLE state (same as the RRC idle state), the situation of the terminal is not valid in the eNB but is stored in the MME. In this case, the location of the UE in the ECM-IDLE state is known only to the MME as the granularity of the list of tracking areas (TAs).
- a single TA is identified by a tracking area identity (TAI) consisting of the PLMN identifier to which the TA belongs and a tracking area code (TAC) that uniquely represents the TA within the PLMN.
- TAI tracking area identity
- TAC tracking area code
- the UE selects a cell having a signal quality and characteristics capable of receiving an appropriate service from among cells provided by the selected PLMN.
- the terminal selects / reselects a cell of appropriate quality and performs procedures for receiving service.
- the UE in the RRC idle state should always select a cell of appropriate quality and prepare to receive service through this cell. For example, a terminal that has just been powered on must select a cell of appropriate quality to register with the network. When the terminal in the RRC connected state enters the RRC idle state, the terminal should select a cell to stay in the RRC idle state. As such, the process of selecting a cell satisfying a certain condition in order for the terminal to stay in a service standby state such as an RRC idle state is called cell selection.
- the cell selection is performed in a state in which the UE does not currently determine a cell to stay in the RRC idle state, it is most important to select the cell as soon as possible. Therefore, if the cell provides a radio signal quality of a predetermined criterion or more, even if this cell is not the cell providing the best radio signal quality to the terminal, it may be selected during the cell selection process of the terminal.
- an initial cell selection process in which the terminal does not have prior information on the radio channel. Accordingly, the terminal searches all radio channels to find an appropriate cell. In each channel, the terminal finds the strongest cell. Thereafter, the terminal selects a corresponding cell if it finds a suitable cell that satisfies a cell selection criterion.
- the terminal may select the cell by using the stored information or by using the information broadcast in the cell.
- cell selection can be faster than the initial cell selection process.
- the UE selects a corresponding cell if it finds a cell that satisfies a cell selection criterion. If a suitable cell that satisfies the cell selection criteria is not found through this process, the UE performs an initial cell selection process.
- the terminal After the terminal selects a cell through a cell selection process, the strength or quality of a signal between the terminal and the base station may change due to a change in mobility or a wireless environment of the terminal. Therefore, if the quality of the selected cell is degraded, the terminal may select another cell that provides better quality. When reselecting a cell in this way, a cell that generally provides better signal quality than the currently selected cell is selected. This process is called cell reselection.
- the cell reselection process has a basic purpose in selecting a cell that generally provides the best quality to a terminal in view of the quality of a radio signal.
- the network may determine the priority for each frequency and notify the terminal. Upon receiving this priority, the UE considers this priority prior to the radio signal quality criteria in the cell reselection process.
- a method of selecting or reselecting a cell according to a signal characteristic of a wireless environment In selecting a cell for reselection when reselecting a cell, the following cell reselection is performed according to a cell's RAT and frequency characteristics. There may be a method of selection.
- Intra-frequency cell reselection Reselection of a cell having a center-frequency equal to the RAT, such as a cell in which the UE is camping
- Inter-frequency cell reselection Reselects a cell having a center frequency different from that of the same RAT as the cell camping
- Inter-RAT cell reselection The UE reselects a cell that uses a different RAT from the camping RAT.
- the UE measures the quality of a serving cell and a neighboring cell for cell reselection.
- cell reselection is performed based on cell reselection criteria.
- the cell reselection criteria have the following characteristics with respect to serving cell and neighbor cell measurements.
- Intra-frequency cell reselection is basically based on ranking.
- Ranking is an operation of defining index values for cell reselection evaluation and using the index values to order the cells in the order of the index values.
- the cell with the best indicator is often called the best ranked cell.
- the cell index value is a value obtained by applying a frequency offset or a cell offset as necessary based on the value measured by the terminal for the corresponding cell.
- Inter-frequency cell reselection is based on the frequency priority provided by the network.
- the terminal attempts to camp on the frequency with the highest frequency priority.
- the network may provide the priorities to be commonly applied to the terminals in the cell or provide the frequency priority through broadcast signaling, or may provide the priority for each frequency for each terminal through dedicated signaling.
- the cell reselection priority provided through broadcast signaling may be referred to as common priority, and the cell reselection priority set by the network for each terminal may be referred to as a dedicated priority.
- the terminal may also receive a validity time associated with the dedicated priority.
- the terminal starts a validity timer set to the valid time received together.
- the terminal applies the dedicated priority in the RRC idle mode while the validity timer is running.
- the validity timer expires, the terminal discards the dedicated priority and applies the public priority again.
- the network may provide the UE with a parameter (for example, frequency-specific offset) used for cell reselection for each frequency.
- a parameter for example, frequency-specific offset
- the network may provide the UE with a neighboring cell list (NCL) used for cell reselection.
- NCL neighboring cell list
- This NCL contains cell-specific parameters (eg cell-specific offsets) used for cell reselection.
- the network may provide the UE with a cell reselection prohibition list (black list) used for cell reselection.
- the UE does not perform cell reselection for a cell included in the prohibition list.
- the ranking criterion used to prioritize the cells is defined as in Equation 1.
- R s is the ranking indicator of the serving cell
- R n is the ranking indicator of the neighbor cell
- Q meas s is the quality value measured by the UE for the serving cell
- Q meas n is the quality measured by the UE for the neighbor cell
- Q hyst is a hysteresis value for ranking
- Q offset is an offset between two cells.
- the terminal may alternately select two cells.
- Q hyst is a parameter for giving hysteresis in cell reselection to prevent the UE from reselecting two cells alternately.
- the UE measures R s of the serving cell and R n of the neighboring cell according to the above equation, considers the cell having the highest ranking indicator value as the best ranked cell, and reselects the cell.
- the quality of the cell serves as the most important criterion in cell reselection. If the reselected cell is not a normal cell, the terminal excludes the frequency or the corresponding cell from the cell reselection target.
- RLM Radio Link Monitoring
- the terminal monitors the downlink quality based on a cell-specific reference signal to detect the downlink radio link quality of the PCell.
- the UE estimates the downlink radio link quality for PCell downlink radio link quality monitoring purposes and compares it with thresholds Qout and Qin.
- the threshold Qout is defined as the level at which the downlink radio link cannot be stably received, which corresponds to a 10% block error rate of hypothetical PDCCH transmission in consideration of the PDFICH error.
- the threshold Qin is defined as a downlink radio link quality level that can be received more stably than the level of Qout, which corresponds to a 2% block error rate of virtual PDCCH transmission in consideration of PCFICH errors.
- RLF Radio Link Failure
- the UE continuously measures to maintain the quality of the radio link with the serving cell receiving the service.
- the terminal determines whether communication is impossible in the current situation due to deterioration of the quality of the radio link with the serving cell. If the quality of the serving cell is so low that communication is almost impossible, the terminal determines the current situation as a radio connection failure.
- the UE abandons communication with the current serving cell, selects a new cell through a cell selection (or cell reselection) procedure, and reestablishes an RRC connection to the new cell (RRC connection re). -establishment).
- FIG. 7 is a diagram illustrating a RRC connection reestablishment procedure.
- the terminal stops use of all radio bearers which have been set except for Signaling Radio Bearer # 0 (SRB 0) and initializes various sublayers of an access stratum (AS) (S710).
- SRB 0 Signaling Radio Bearer # 0
- AS access stratum
- each sublayer and physical layer are set to a default configuration.
- the UE maintains an RRC connection state.
- the UE performs a cell selection procedure for performing an RRC connection reconfiguration procedure (S720).
- the cell selection procedure of the RRC connection reestablishment procedure may be performed in the same manner as the cell selection procedure performed by the UE in the RRC idle state, although the UE maintains the RRC connection state.
- the terminal After performing the cell selection procedure, the terminal checks the system information of the corresponding cell to determine whether the corresponding cell is a suitable cell (S730). If it is determined that the selected cell is an appropriate E-UTRAN cell, the terminal transmits an RRC connection reestablishment request message to the cell (S740).
- the RRC connection re-establishment procedure is stopped, the terminal is in the RRC idle state Enter (S750).
- the terminal may be implemented to complete the confirmation of the appropriateness of the cell within a limited time through the cell selection procedure and the reception of system information of the selected cell.
- the UE may drive a timer as the RRC connection reestablishment procedure is initiated.
- the timer may be stopped when it is determined that the terminal has selected a suitable cell. If the timer expires, the UE may consider that the RRC connection reestablishment procedure has failed and may enter the RRC idle state.
- This timer is referred to hereinafter as a radio link failure timer.
- a timer named T311 may be used as a radio link failure timer.
- the terminal may obtain the setting value of this timer from the system information of the serving cell.
- the cell When the RRC connection reestablishment request message is received from the terminal and the request is accepted, the cell transmits an RRC connection reestablishment message to the terminal.
- the UE Upon receiving the RRC connection reestablishment message from the cell, the UE reconfigures the PDCP sublayer and the RLC sublayer for SRB1. In addition, it recalculates various key values related to security setting and reconfigures the PDCP sublayer responsible for security with newly calculated security key values. Through this, SRB 1 between the UE and the cell is opened and an RRC control message can be exchanged. The terminal completes the resumption of SRB1 and transmits an RRC connection reestablishment complete message indicating that the RRC connection reestablishment procedure is completed to the cell (S760).
- the cell transmits an RRC connection reestablishment reject message to the terminal.
- the cell and the terminal performs the RRC connection reestablishment procedure.
- the UE recovers the state before performing the RRC connection reestablishment procedure and guarantees the continuity of the service to the maximum.
- the UE reports this failure event to the network when an RLF occurs or a handover failure occurs in order to support Mobility Robustness Optimization (MRO) of the network.
- MRO Mobility Robustness Optimization
- the UE may provide an RLF report to the eNB.
- Radio measurements included in the RLF report can be used as potential reasons for failure to identify coverage problems. This information can be used to exclude such events from the MRO evaluation of intra-LTE mobility connection failures and to write those events as input to other algorithms.
- the UE may generate a valid RLF report for the eNB after reconnecting in the idle mode. For this purpose, the UE stores the latest RLF or handover failure related information, and for 48 hours after the RLF report is retrieved by the network or after the RLF or handover failure is detected, the RRC connection ( Re-establishment and handover may indicate to the LTE cell that the RLF report is valid.
- the UE maintains the information during state transition and RAT change, and indicates that the RLF report is valid again after returning to the LTE RAT.
- the validity of the RLF report in the RRC connection establishment procedure indicates that the UE has been interrupted such as a connection failure and that the RLF report due to this failure has not yet been delivered to the network.
- the RLF report from the terminal includes the following information.
- E-CGI of the target cell of the last cell in case of RRL or handover that provided a service to the terminal. If the E-CGI is unknown, PCI and frequency information is used instead.
- E-CGI of the cell that serviced the terminal when the last handover initialization for example when message 7 (RRC connection reset) was received by the terminal.
- the eNB receiving the RLF failure from the terminal may forward the report to the eNB that provided the service to the terminal before the reported connection failure.
- Radio measurements included in the RLF report can be used to identify coverage issues as a potential cause of radio link failure. This information can be used to exclude these events from the MRO assessment of intra-LTE mobility connection failures and send them back as input to other algorithms.
- RRM radio resource management
- the terminal may perform measurement for a specific purpose set by the network and report the measurement result to the network in order to provide information that may help the operator operate the network in addition to the purpose of mobility support. For example, the terminal receives broadcast information of a specific cell determined by the network.
- the terminal may include a cell identity (also referred to as a global cell identifier) of the specific cell, location identification information (eg, tracking area code) to which the specific cell belongs, and / or other cell information (eg, For example, whether a member of a closed subscriber group (CSG) cell is a member) may be reported to the serving cell.
- a cell identity also referred to as a global cell identifier
- location identification information eg, tracking area code
- other cell information eg, For example, whether a member of a closed subscriber group (CSG) cell is a member
- the mobile station may report location information and measurement results of poor quality cells to the network.
- the network can optimize the network based on the report of the measurement results of the terminals helping the network operation.
- the terminal In a mobile communication system with a frequency reuse factor of 1, mobility is mostly between different cells in the same frequency band. Therefore, in order to ensure the mobility of the terminal well, the terminal should be able to measure the quality and cell information of neighboring cells having the same center frequency as the center frequency of the serving cell. As such, the measurement of the cell having the same center frequency as that of the serving cell is called intra-frequency measurement. The terminal performs the intra-frequency measurement and reports the measurement result to the network at an appropriate time, so that the purpose of the corresponding measurement result is achieved.
- the mobile operator may operate the network using a plurality of frequency bands.
- the terminal may measure quality and cell information of neighboring cells having a center frequency different from that of the serving cell. Should be As such, a measurement for a cell having a center frequency different from that of the serving cell is called inter-frequency measurement.
- the terminal should be able to report the measurement results to the network at an appropriate time by performing inter-frequency measurements.
- the terminal When the terminal supports the measurement for the network based on the other RAT, it may be measured for the cell of the network by the base station configuration. This measurement is called inter-radio access technology (inter-RAT) measurement.
- the RAT may include a UMTS Terrestrial Radio Access Network (UTRAN) and a GSM EDGE Radio Access Network (GERAN) conforming to the 3GPP standard, and may also include a CDMA 2000 system conforming to the 3GPP2 standard.
- UTRAN UMTS Terrestrial Radio Access Network
- GERAN GSM EDGE Radio Access Network
- FIG. 8 is a flowchart illustrating a conventional measurement method.
- the terminal receives measurement configuration information from the base station (S810).
- a message including measurement setting information is called a measurement setting message.
- the terminal performs the measurement based on the measurement configuration information (S820). If the measurement result satisfies the reporting condition in the measurement configuration information, and reports the measurement result to the base station (S830).
- a message containing a measurement result is called a measurement report message.
- the measurement setting information may include the following information.
- the measurement object includes at least one of an intra-frequency measurement object that is an object for intra-cell measurement, an inter-frequency measurement object that is an object for inter-cell measurement, and an inter-RAT measurement object that is an object for inter-RAT measurement.
- the intra-frequency measurement object indicates a neighboring cell having the same frequency band as the serving cell
- the inter-frequency measurement object indicates a neighboring cell having a different frequency band from the serving cell
- the inter-RAT measurement object is
- the RAT of the serving cell may indicate a neighboring cell of another RAT.
- the report setting information may consist of a list of report settings.
- Each reporting setup may include a reporting criterion and a reporting format.
- the reporting criterion is a criterion that triggers the terminal to transmit the measurement result.
- the reporting criteria may be a single event for the measurement reporting period or the measurement report.
- the report format is information on what type the terminal configures the measurement result.
- Measurement identity information This is information about a measurement identifier that associates a measurement object with a report configuration, and allows the terminal to determine what type and when to report to which measurement object.
- the measurement identifier information may be included in the measurement report message to indicate which measurement object the measurement result is and in which reporting condition the measurement report occurs.
- Quantitative configuration information information on a parameter for setting filtering of a measurement unit, a reporting unit, and / or a measurement result value.
- Measurement gap information Information about a measurement gap, which is a section in which a UE can only use measurement without considering data transmission with a serving cell because downlink transmission or uplink transmission is not scheduled. .
- the terminal has a measurement target list, a measurement report configuration list, and a measurement identifier list to perform a measurement procedure.
- the base station may set only one measurement target for one frequency band to the terminal.
- E-UTRA Evolved Universal Terrestrial Radio Access
- RRC Radio Resource Control
- Protocol specification Release 8
- the terminal If the measurement result of the terminal satisfies the set event, the terminal transmits a measurement report message to the base station.
- measurement identifier 1 901 connects an intra-frequency measurement object and report setting 1.
- the terminal performs intra frequency measurement, and report setting 1 is used to determine a criterion and report type of the measurement result report.
- the measurement identifier 2 902 is connected to the intra-frequency measurement object like the measurement identifier 1 901, but is connected to the setting 2 by viewing the intra-frequency measurement object.
- the terminal performs the measurement, and report setting 2 is used to determine the criteria and report type of the measurement result report.
- the terminal transmits the measurement result even if the measurement result for the intra-frequency measurement object satisfies any one of the report setting 1 and the report setting 2.
- Measurement identifier 3 903 connects inter-frequency measurement object 1 and report configuration 3.
- the terminal reports the measurement result when the measurement result for the inter-frequency measurement object 1 satisfies the reporting condition included in the report configuration 1.
- Measurement identifier 4 904 connects inter-frequency measurement object 2 and report configuration 2.
- the terminal reports the measurement result if the measurement result for the inter-frequency measurement object 2 satisfies the reporting condition included in the report configuration 2.
- the measurement target, report setting, and / or measurement identifier may be added, changed, and / or deleted. This may be indicated by the base station sending a new measurement configuration message to the terminal, or by sending a measurement configuration change message.
- FIG. 10 shows an example of deleting a measurement identifier. If measurement identifier 2 902 is deleted, measurement for the measurement object associated with measurement identifier 2 902 is stopped and no measurement report is transmitted. The measurement object or report setting associated with the deleted measurement identifier may not be changed.
- FIG. 11 shows an example of deleting a measurement object. If the inter-frequency measurement object 1 is deleted, the terminal also deletes the associated measurement identifier 3 903. The measurement for the inter-frequency measurement object 1 is stopped and no measurement report is transmitted. However, the report setting associated with the deleted inter-frequency measurement object 1 may not be changed or deleted.
- the terminal If the reporting configuration is removed, the terminal also removes the associated measurement identifier. The terminal stops measuring the associated measurement object by the associated measurement identifier. However, the measurement object associated with the deleted report setting may not be changed or deleted.
- the measurement report may include a measurement identifier, a measured quality of the serving cell, and a measurement result of a neighboring cell.
- the measurement identifier identifies the measurement object for which the measurement report is triggered.
- the measurement result of the neighbor cell may include the cell identifier of the neighbor cell and the measured quality.
- the measured quality may include at least one of Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ).
- LTE-A is an IMT-Advanced candidate technology of the International Telecommunicatino Union (ITU) and is designed to meet the IMT-Advanced technology requirements of the ITU. Accordingly, in LTE-A, discussions are being made to expand the bandwidth compared to the existing LTE system in order to satisfy the requirements of the ITU.
- ITU International Telecommunicatino Union
- FIG. 12 is a diagram illustrating an example of a carrier aggregation technique.
- a carrier that can have in an existing LTE system is defined as a component carrier (CC), and it is discussed to enable the use of up to five such CCs. Since the CC may have a maximum bandwidth of 20 MHz, as in an LTE system, it may be extended to a maximum bandwidth of 100 MHz when five CCs are used. Using a plurality of CCs as described above is called a carrier aggregation technique.
- CC component carrier
- the radio resources used by the UE may be configured to additionally configure CC for carrier aggregation, similarly to the case in which an additional serving cell is configured in the UE in addition to the existing serving cell. That is, a plurality of CCs are configured in the terminal, which is logically similar to a plurality of serving cells configured in the terminal.
- the UE may be provided with a service from a plurality of serving cells, and the serving cell may be called a PCell and a cell for carrier aggregation may be called an SCell.
- the additionally configured CC may be represented by an SCell which is an additionally configured serving cell.
- the UE may need to acquire information on the SCell for carrier aggregation from the network.
- the carrier aggregation configuration information may include system information of the CC (system information for a cell that may be configured as SCell) and parameter information related to various other CC operations.
- the RRC connection reconfiguration procedure may be used for the network to additionally configure the serving cell in the terminal.
- the network may additionally include carrier aggregation configuration information including information on the SCell to be configured in the RRC connection reconfiguration message and transmit the same to the terminal.
- the UE may additionally receive a serving cell through carrier aggregation configuration information and perform communication based on the serving cell.
- the activation / deactivation mechanism of the SCell may be supported.
- the activation or deactivation of the PCell in the carrier aggregation has no room to apply.
- the SCell When the SCell is deactivated, the UE no longer needs to receive the corresponding PDCCH and / or PDSCH, so that the uplink transmission cannot be performed or the CQI measurement is not required.
- the SCell when the SCell is activated, the UE should receive the PDSCH and the PDCCH (if configured to monitor the PDCCH from the SCell), and can be expected to be able to perform CQI measurement.
- Such a SCell activation / deactivation mechanism may be based on MAC control elements and deactivation timers.
- the MAC control element has a bitmap for activating and deactivating SCells. A bit set to '1' indicates that the corresponding SCell is activated, and a bit set to '0' indicates that the corresponding SCell is inactive.
- SCells may be activated and deactivated individually, and a single activation / deactivation indication may indicate activation / deactivation for some Scell sets of SCells.
- the deactivation timer is maintained for each SCell, but may be set to a common value for each terminal by the RRC.
- the SCell may be initially added to the serving cell set while being deactivated. In addition, the activation set of the SCell existing in the serving cell set is not changed.
- the SCells are deactivated.
- a plurality of cells of the same frequency may be configured in the terminal.
- the UE may be configured with a macro cell and a small cell at the same frequency to the UE.
- the terminal transmits and receives mobility-related control information and other control information and user data when necessary through a macro cell, and mainly transmits and receives user data through a small cell, thereby enabling stable mobility of the terminal, improving data speed of the terminal, and network. Load balancing can be achieved.
- the cell e.g., macro cell
- the small cell e.g., femto cell, pico cell
- the terminal manages the serving cell when the terminal deteriorates performance than when it is impossible or impossible to maintain and operate the existing serving cell. It may be desirable to.
- the UE actively manages when the management of the serving cell is required. You may not be able to. This may cause a problem of deterioration of performance in contrast to the purpose of providing improved communication quality through carrier aggregation. Accordingly, there is a need for a communication method for allowing a terminal to determine a need for serving cell management and autonomously manage a serving cell according to a determination result.
- FIG. 13 illustrates an autonomous serving cell management based communication method according to an embodiment of the present invention.
- the terminal determines whether a serving cell management condition is satisfied (S1310). It is preferable that the UE autonomously manages the serving cell only when a specific condition is satisfied.
- the serving cell management condition may include a first condition for removing / deactivating a serving cell and a second condition for adding / activating a serving cell. If the first condition is satisfied, the terminal may stop using the cell by deactivating a specific serving cell or excluding it from the serving cell set for carrier aggregation. When the second condition is satisfied, the terminal activates a specific serving cell in an inactive state in the serving cell set for carrier aggregation or adds another serving cell to the serving cell set for carrier aggregation, thereby preventing use of the serving cell. You can start / resume.
- the first condition associated with removal / deactivation of the serving cell may be as follows.
- the measurement result may be RSRP or RSRQ.
- the measurement result may be a CQI value.
- the threshold may be a preset value for the terminal.
- the threshold may be a value received from the network.
- the measured value is less than the offset value of the measured value of another specific serving cell currently set in the terminal.
- the measurement result may be RSRP or RSRQ.
- the measurement result may be a CQI value.
- the other specific serving cell may be a serving cell preset to the terminal.
- Another specific serving cell may be a PCell.
- Another specific serving cell may be a serving cell designated by the network.
- the offset may be a value preset to the terminal.
- the offset may be a value received from the network.
- the terminal When the terminal cannot simultaneously perform the operation of the terminal through all of the currently configured serving cells and the operation of another RAT due to the limitation of the RF capability or the baseband processing capability of the terminal, the terminal may perform some of the serving cells. The operation can be deactivated and the operation of another RAT can be performed.
- the UE when a UE configured with two LTE serving cells starts to use the UMTS RAT for voice or other services, when the UE starts using the UMTS RAT, one of two serving cells configured due to the capability constraint of the UE The serving cell may become unavailable.
- the second condition related to the addition / activation of the serving cell may be as follows.
- the measured value is greater than or equal to the threshold value.
- the measurement result may be RSRP or RSRQ.
- the measurement result may be a CQI value.
- the threshold may be a preset value for the terminal.
- the threshold may be a value received from the network.
- the measurement result may be RSRP or RSRQ.
- the measurement result may be a CQI value.
- the threshold may be a preset value for the terminal.
- the threshold may be a value received from the network.
- the measured value is more than the offset value of the measurement value of the other specific serving cell currently configured for the UE.
- the measurement result may be RSRP or RSRQ.
- the measurement result may be a CQI value.
- the other specific serving cell may be a serving cell preset to the terminal.
- Another specific serving cell may be a PCell.
- Another specific serving cell may be a serving cell designated by the network.
- the offset may be a value preset to the terminal.
- the offset may be a value received from the network.
- the measured value is more than the offset value of the measurement value of the other specific serving cell currently set to the terminal.
- the measurement result may be RSRP or RSRQ.
- the measurement result may be a CQI value.
- the other specific serving cell may be a serving cell preset to the terminal.
- Another specific serving cell may be a PCell.
- Another specific serving cell may be a serving cell designated by the network.
- the offset may be a value preset to the terminal.
- the offset may be a value received from the network.
- the UE deactivates some of the serving cells.
- the operation of another RAT may be performed.
- the UE can activate the serving cell by itself.
- the terminal stops using the corresponding serving cell itself, and the service through the UMTS RAT is terminated, thus no longer UMTS RAT. If it is not necessary to use, the terminal can activate the LTE serving cell deactivated by itself.
- the terminal autonomously performs serving cell management according to the condition satisfaction (S1320). Whether the first condition is satisfied with respect to the removal / deactivation may be considered, and whether the second condition is satisfied with respect to the addition / activation may be considered.
- the UE may autonomously manage the serving cell by removing a specific serving cell from the serving cell set or adding a new serving cell to the cell set.
- the terminal may manage the serving cell by deleting or adding a setting of a specific serving cell for carrier aggregation in the terminal.
- the terminal may add a specific neighbor cell satisfying a specific condition as a serving cell.
- the terminal may set the corresponding serving cell by using a default setting previously stored by the terminal.
- the basic setting may be a setting previously received by the terminal from the network and / or a preset setting between the terminal and the network.
- the terminal can remove the serving cell that satisfies a specific condition.
- the terminal may store configuration information of the serving cell that can be applied when adding the serving cell later.
- the UE autonomously manages the serving cell, it may be to deactivate the cell (stop using the cell) or to activate the cell while maintaining the configuration of the cell for the particular serving cell.
- the terminal can activate the serving cell that satisfies a specific condition.
- the terminal can deactivate the serving cell that satisfies a specific condition.
- the UE which has performed the serving cell management reports the serving cell management result to the network (S1330).
- the terminal may report this to the network.
- the terminal may include the identifier of the serving cell deactivated in the report message.
- the terminal may include the identifier of the removed specific cell in the report message.
- the terminal may report this to the network.
- the terminal may include the identifier of the activated serving cell in the report message.
- the terminal may include the identifier of the added specific cell in the report message.
- the terminal may include information related to the basic setting in the serving cell management report message. For example, the terminal may include information indicating that the serving cell has been added through the basic configuration in adding the serving cell to the serving cell management report message.
- the terminal may report the reason for serving cell management.
- the UE may report information on the serving cell management operation to the network through the serving cell not related to the management operation. That is, the terminal may report the information about the cell management operation to the network through another serving cell not related to the activated / deactivated / removed / added cell. For example, the terminal may perform the serving cell management report through the PCell.
- an operation of a terminal according to an embodiment of the present invention may be performed only when autonomous serving cell management is allowed from a network.
- Allowing autonomous serving cell management may allow the UE to autonomously perform addition / removal / activation / deactivation of the serving cell.
- the allowance of autonomous serving cell management is to allow the deactivation / removal of the serving cell autonomously. In this case, the activation / addition of the serving cell cannot be performed autonomously by the terminal. Allowing autonomous serving cell management is to allow activation / addition of the serving cell autonomously, in which case, deactivation / removal of the serving cell cannot be performed autonomously. Allowing autonomous serving cell management may be that autonomous serving cell management is allowed only for one or more indicated serving cells. Allowing autonomous serving cell management may be to allow autonomous serving cell management for all SCells.
- the terminal receives the above-described configuration related to the permission of the autonomous serving cell management.
- the terminal may determine that autonomous serving cell management is allowed.
- the terminal may receive a list of cell identifiers that are subject to autonomous serving cell management from the network.
- the terminal acquiring the cell identifier list may detect a cell included in the list through neighbor cell measurement, and add the corresponding neighbor cell as a serving cell when the second condition of the cell is satisfied. Meanwhile, cells not included in the cell list among neighbor cells may not be added as serving cells.
- the terminal may receive configuration information of a serving cell to be used when performing a serving cell addition operation through autonomous serving cell management from a network. Upon receiving the configuration information, the terminal may set the serving cell by applying the received configuration information when adding the serving cell.
- the target serving cell of the serving cell management may be limited to the SCell. That is, the terminal may exclude the PCell from the serving cell management target.
- FIG. 14 is a diagram illustrating an example of an autonomous serving cell management based communication method according to an embodiment of the present invention.
- the terminal acquires serving cell configuration information from the network (S1410).
- the serving cell configuration information may include a list of target cells in which the UE may autonomously perform serving cell management.
- the terminal may perform autonomous serving cell management for the cells included in the cell list.
- the serving cell configuration information exemplarily includes a cell list including cell 2 and cell 3.
- the serving cell configuration information may be obtained through a process in which the UE establishes / reestablishes / configures an RRC connection with the network.
- the serving cell configuration information may be transmitted as included in system information and / or configuration message of a specific cell.
- the terminal operates with cell 1 as a serving cell (S1420). Through this, the cell 1 may be operated as the PCell of the terminal.
- the terminal performs measurement and evaluation on the serving cell and the neighboring cell (S1431).
- the UE may obtain measurement quality (e.g. RSRQ, RSRP and / or CQI) of the serving cell and / or the neighboring cell through the measurement.
- measurement quality e.g. RSRQ, RSRP and / or CQI
- the UE adds cell 2 satisfying the second condition as a serving cell (S1432). Through this, the cell 2 may be operated as an SCell.
- the terminal transmits a serving cell management report message to the network (S1433).
- the serving cell management report message may be implemented through transmission to cell 1 which is the PCell of the terminal.
- the serving cell management report message may include information indicating that cell 2 has been added as a serving cell. To this end, the serving cell management report message may include identification information of cell 2. The serving cell management report message may further include information indicating a reason for performing serving cell management. The serving cell management report message transmitted in S1433 may include information indicating that cell 2 has been added due to the measurement quality of cell 2.
- the terminal performs measurement and evaluation for the serving cell (S1441).
- the UE may obtain measurement quality (e.g. RSRQ, RSRP and / or CQI) for the serving cell through the measurement.
- measurement quality e.g. RSRQ, RSRP and / or CQI
- the measurement quality result of Cell 2 which is the SCell satisfies the first condition for removal among the serving cell management conditions.
- the terminal removes the cell 2 that satisfies the first condition from the serving cell (S1442).
- the terminal transmits a serving cell management report message to the network (S1443).
- the serving cell management report message may be implemented through transmission to cell 1 which is the PCell of the terminal.
- the serving cell management report message may include information indicating that cell 2 has been removed from the serving cell. To this end, the serving cell management report message may include identification information of the cell 2. The serving cell management report message may further include information indicating a reason for performing serving cell management. The serving cell management report message transmitted in S1443 may include information indicating that cell 2 has been removed due to the measurement quality of cell 2.
- the terminal performs measurement and evaluation on the serving cell and the neighboring cell (S1451).
- the UE may obtain measurement quality (e.g. RSRQ, RSRP and / or CQI) of the serving cell and / or the neighboring cell through the measurement.
- measurement quality e.g. RSRQ, RSRP and / or CQI
- the UE adds cell 3 satisfying the second condition as a serving cell (S1452). This allows cell 3 to operate as an SCell.
- the terminal transmits a serving cell management report message to the network (S1453).
- the serving cell management report message may be implemented through transmission to cell 1 which is the PCell of the terminal.
- the serving cell management report message may include information indicating that cell 3 has been added as a serving cell. To this end, the serving cell management report message may include identification information of cell 3. The serving cell management report message may further include information indicating a reason for performing serving cell management.
- the serving cell management report message transmitted in S1453 may include information indicating that cell 2 has been added due to cell 3 measurement quality.
- the terminal receives a service from at least one serving cell, and the terminal may manage a serving cell that provides a service through measurement and evaluation by itself.
- 15 is a diagram illustrating another example of an autonomous serving cell management based communication method according to an embodiment of the present invention.
- Cell 1 and Cell 2 that can provide services to the UE are LTE-based cells, and Cell 3 is a UMTS-based cell.
- the terminal operates by setting cell 1 and cell 2 as serving cells (S1510).
- cell 1 operates as a PCell and cell 2 as an SCell.
- the terminal may be provided with the LTE-based service through the cell 1 and the cell 2.
- the UE confirms that the service on the UMTS cell is to be started or scheduled to be started during operation (S1521). This may be done by acquiring information from the network indicating that the service on the UMTS cell is to be or is scheduled to be started, or by determining the terminal itself. Through this, the UE may determine that the first condition, which is the removal / deactivation condition of the serving cell, is satisfied.
- the terminal deactivates cell 2 which is an SCell (S1522).
- the terminal transmits a serving cell management report message to the network (S1523).
- the serving cell management report message may be implemented through transmission to cell 1 which is the PCell of the terminal.
- the serving cell management report message may include information indicating that cell 2 has been deactivated. To this end, the serving cell management report message may include identification information of cell 2. The serving cell management report message may further include information indicating a reason for performing serving cell management.
- the serving cell management report message transmitted in S1523 may include information indicating that cell 2 has been deactivated because the service on the UMTS cell is to be started or scheduled to be started.
- the terminal may maintain cell 1 as a PCell as an activated serving cell. That is, autonomous serving cell management by the terminal may be configured to be applied only to the SCell among at least one serving cell.
- the terminal continuously receives a service on the UMTS cell (S1530).
- the terminal confirms that the service on the provided UMTS cell has ended (S1541). This may be performed by acquiring information indicating that the service on the UMTS cell is terminated from the network or by the terminal itself. Through this, the terminal may determine that the second condition, which is an addition / activation condition of the serving cell, is satisfied.
- the terminal activates cell 2 which is an inactivated Scell (S1542).
- the UE Upon activation of cell 2, the UE transmits a serving cell management report message to the network (S1543).
- the serving cell management report message may be implemented through transmission to cell 1 which is the PCell of the terminal.
- the serving cell management report message may include information indicating that cell 2 is activated. To this end, the serving cell management report message may include identification information of cell 2. The serving cell management report message may further include information indicating a reason for performing serving cell management.
- the serving cell management report message transmitted in S1543 may include information indicating that cell 2 is activated due to termination of a service on a UMTS cell.
- the terminal may manage the serving cell autonomously based on the service environment of the serving cell and / or the neighboring cell.
- serving cells suitable for providing a service to a terminal can be adaptively configured, which enables a more efficient and efficient service to be provided to the terminal through one or more serving cell settings.
- the terminal may manage the autonomous serving cell based on whether the service is provided through another RAT based on the capability of the terminal.
- LTE cells may be unnecessarily set as a serving cell and stand by when providing services through other RATs, thereby enabling more efficient network operation.
- FIG. 16 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- the apparatus may be set to implement the communication method according to the embodiment of the present invention described above with reference to FIGS. 13 to 15.
- the wireless device 1600 may be implemented as a terminal, a base station, and a collection network entity performing the correlation evaluation method according to an embodiment of the present invention.
- the wireless device 1600 includes a processor 1610, a memory 1620, and a radio frequency unit 1630.
- Processor 1610 implements the proposed functions, processes, and / or methods.
- the processor 1610 may be configured to perform an autonomous serving cell management based communication method according to an embodiment of the present invention.
- the processor 1610 may be configured to evaluate whether a serving cell management condition is satisfied.
- the processor 1610 may be configured to manage the serving cell according to the satisfied serving cell management condition.
- the processor 1610 may be configured to report to a network in connection with performing serving cell management. 13 to 15 may be set to implement the embodiment of the present invention described above.
- the RF unit 1630 is connected to the processor 1610 to transmit and receive a radio signal.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
- the RF unit may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
Abstract
Description
이벤트 | 보고 조건 |
Event A1 | Serving becomes better than threshold |
Event A2 | Serving becomes worse than threshold |
Event A3 | Neighbour becomes offset better than serving |
Event A4 | Neighbour becomes better than threshold |
Event A5 | Serving becomes worse than threshold1 and neighbour becomes better than threshold2 |
Event B1 | Inter RAT neighbour becomes better than threshold |
Event B2 | Serving becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2 |
Claims (16)
- 무선 통신 시스템에서 단말에 의해 수행되는 통신 방법에 있어서,
서빙 셀 관리 조건의 만족 여부를 판단하고; 및
만족된 상기 서빙 셀 관리 조건에 따라 상기 단말에 대한 적어도 하나의 서빙 셀을 포함하는 셀 세트를 관리하는 것;을 포함하는 것을 특징으로 하는 통신 방법. - 제 1항에 있어서, 상기 서빙 셀 관리 조건은
비활성화 또는 제거를 위한 제1 조건; 및
활성화 또는 추가를 위한 제2 조건;을 포함함을 특징으로 하는 통신 방법. - 제 2항에 있어서, 상기 셀 세트를 관리하는 것은,
상기 셀 세트에 포함된 특정 서빙 셀이 상기 제1 조건을 만족시키면, 상기 특정 서빙 셀을 비활성화시키는 것을 포함함을 특징으로 하는 통신 방법. - 제 2항에 있어서, 상기 셀 세트를 관리하는 것은,
상기 셀 세트에 포함된 특정 서빙 셀이 상기 제1 조건을 만족시키면, 상기 특정 서빙 셀을 상기 셀 세트에서 제거하는 것을 포함함을 특징으로 하는 통신 방법. - 제 2항에 있어서, 상기 셀 세트를 관리하는 것은,
상기 셀 세트에 포함되어 있고 비활성화된 특정 서빙 셀이 상기 제2 조건을 만족시키면, 상기 특정 서빙 셀을 활성화시키는 것을 포함함을 특징으로 하는 통신 방법. - 제 2항에 있어서, 상기 셀 세트를 관리하는 것은,
특정 이웃 셀이 상기 제2 조건을 만족시키면, 상기 특정 이웃 셀을 상기 셀 세트에 포함시키는 것을 포함함을 특징으로 하는 통신 방법. - 제 2항에 있어서,
상기 서빙 셀 세트에 포함된 특정 서빙셀의 측정 품질이 특정 임계값보다 작으면, 상기 특정 서빙셀은 상기 제1 조건을 만족시키는 것을 특징으로 하는 통신 방법. - 제 2항에 있어서,
상기 서빙 셀 세트에 포함된 특정 서빙셀의 측정 품질이 상기 서빙 셀 세트에 포함된 다른 특정 서빙 셀의 측정 품질보다 특정 오프셋 이하이면, 상기 특정 서빙셀은 상기 제1 조건을 만족시키는 것을 특징으로 하는 통신 방법. - 제 2항에 있어서,
상기 단말의 서비스를 위해 다른 RAT(Radio Access Technology)의 동작이 필요하고 상기 RAT과 현재 동작중인 RAT의 특정 서빙 셀이 동시에 동작할 수 없는 경우, 상기 제1 조건이 만족되는 것을 특징으로 하는 통신 방법. - 제 2항에 있어서,
상기 서빙 셀 세트에 포함되어 있고 비활성화된 특정 서빙 셀 또는 특정 이웃 셀의 측정 품질이 특정 임계값 이상이면, 상기 특정 서빙셀 또는 상기 특정 이웃 셀은 상기 제2 조건을 만족시키는 것을 특징으로 하는 통신 방법. - 제 2항에 있어서,
상기 서빙 셀 세트에 포함되어 있고 비활성화된 특정 서빙 셀 또는 특정 이웃 셀의 측정 품질이 상기 서빙 셀 세트에 포함된 다른 특정 서빙 셀의 측정 품질보다 특정 오프셋 이상이면, 상기 특정 서빙 셀 또는 상기 특정 이웃 셀은 상기 제2 조건을 만족시키는 것을 특징으로 하는 통신 방법. - 제 2항에 있어서,
상기 단말의 서비스를 위해 다른 RAT(Radio Access Technology)의 동작이 중단되면, 상기 제2 조건이 만족되는 것을 특징으로 하는 통신 방법. - 제 2항에 있어서, 상기 방법은,
상기 서빙 셀 세트 관리에 따른 서빙 셀 관리 보고 메시지를 네트워크로 전송하는 것을 더 포함하되,
상기 서빙 셀 관리 보고 메시지는
상기 서빙 셀 관리를 통해 상태가 변경된 적어도 하나의 셀의 식별 정보; 및
상기 서빙 셀 세트의 관리 이유를 지시하는 정보;를 포함함을 특징으로 하는 통신 방법. - 제 1항에 있어서,
상기 단말에 대한 적어도 하나의 서빙 셀은 캐리어 집성(carrier aggregation)을 통한 서비스를 제공하기 위해 상기 단말에 설정된 적어도 하나의 셀이고,
상기 방법은 상기 셀 세트에 포함된 상기 적어도 하나의 서빙 셀로부터 적어도 하나의 부반송파를 통한 서비스를 제공받는 것을 더 포함함을 특징으로 하는 통신 방법. - 제 1항에 있어서,
상기 단말에 상기 셀 세트에 포함된 복수의 서빙 셀이 설정되면, 상기 복수의 서빙 셀은 하나의 매크로 셀 및 적어도 하나의 소형 셀을 포함하고,
상기 방법은 상기 매크로 셀과 제어 정보를 송수신하고, 상기 적어도 하나의 소형 셀과 데이터를 송수신하는 것을 더 포함함을 특징으로 하는 통신 방법. - 무선 통신 시스템에서 동작하는 무선 장치에 있어서, 상기 무선 장치는
무선 신호를 송신 및 수신하는 RF(Radio Frequency) 부; 및
상기 RF부와 기능적으로 결합하여 동작하는 프로세서;를 포함하되, 상기 프로세서는,
서빙 셀 관리 조건의 만족 여부를 판단하고, 및
만족된 상기 서빙 셀 관리 조건에 따라 상기 무선 장치에 대한 적어도 하나의 서빙 셀을 포함하는 셀 세트를 관리하도록 설정되는 것을 특징으로 하는 무선 장치.
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