WO2010104365A2 - 상하향링크 콤포넌트 반송파 설정을 고려한 핸드오버 - Google Patents
상하향링크 콤포넌트 반송파 설정을 고려한 핸드오버 Download PDFInfo
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Definitions
- the present invention relates to a wireless communication system.
- the present invention relates to a method and apparatus for performing handover.
- Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA).
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- MCD division multiple access
- MCDMA multi-carrier frequency division multiple access
- MC-FDMA multi-carrier frequency division multiple access
- the present invention is to provide a method and apparatus for performing a handover in a wireless communication system. Specifically, the present invention relates to a method and apparatus for performing handover in a wireless communication system supporting carrier aggregation.
- a method for performing a handover by a terminal in a wireless mobile communication system supporting carrier aggregation comprising: transmitting a measurement report for a target cell to a serving cell; Receiving from the serving cell a message comprising a signature root sequence index, a cyclic shift parameter and component carrier related information of a target cell; Identifying a contention-based signature generated based on the signature root sequence index and the cyclic shift parameter; And transmitting one of the contention-based signatures to the target cell for random access on one or more component carriers based on the component carrier related information.
- a radio frequency (RF) module for receiving a message including a signature root sequence index, a cyclic shift parameter, and component carrier related information of a target cell from a source base station, and transmitting a random access signature to a target base station; And a processor for processing a message including the signature root sequence index, a cyclic shift parameter, and component carrier related information of a target cell, and preparing the random access signature according to the signature root sequence index and the cyclic shift parameter.
- the random access signature is provided with a terminal transmitted to the target base station through a component carrier identified by the component carrier-related information of the target cell.
- the component carrier related information may include component carrier allocation information designated by the target cell to the terminal.
- Component carrier allocation information may include index information related to an uplink component carrier for performing the random access.
- Index information may include an index of the downlink component carrier linked to the component carrier performing the random access.
- handover may be efficiently performed in a wireless communication system.
- handover may be efficiently performed in a wireless communication system supporting carrier aggregation.
- E-UMTS Evolved Universal Mobile Telecommunications System
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- 3 and 4 illustrate the user / control plane protocol for E-UMTS.
- FIG. 5 illustrates a structure of a radio frame used in an E-UMTS system.
- 3GPP 3rd Gegeration Partnership Project
- LTE Long Term Evolution
- FIG. 7 shows an example of performing communication in a carrier aggregation situation.
- FIG 8 illustrates an overview handover procedure according to one embodiment of the invention.
- FIG 9 illustrates a handover procedure according to an embodiment of the present invention.
- FIG. 10 illustrates a block diagram of a mobile station in accordance with the present invention.
- E-UMTS is also called LTE system.
- Communication networks are widely deployed to provide various communication services such as voice and packet data.
- an E-UMTS network includes an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), an Evolved Packet Core (EPC), and one or more UEs.
- the E-UTRAN may include one or more base stations (eNBs) 20, and the plurality of terminals 10 may be located in one cell.
- eNBs base stations
- One or more E-UTRAN mobility management entity / system architecture evolution (MME / SAE) gateways 30 may be located at the network end and connected to an external network.
- downlink refers to communication from the base station 20 to the terminal 10
- uplink refers to communication from the terminal to the base station.
- Terminal 10 is a communication device carried by a user and may also be referred to as a mobile station (MS), user terminal (UT), subscriber station (SS), or wireless device.
- Base station 20 is generally a fixed station that communicates with terminal 10 and may also be referred to as an access point (AP).
- the base station 20 provides the terminal 10 with end points of the user plane and the control plane.
- One base station 20 may be arranged per cell.
- An interface for transmitting user traffic or control traffic may be used between the base stations 20.
- the MME / SAE gateway 30 provides an endpoint of the session and mobility management function to the terminal 10.
- the base station 20 and the MME / SAE gateway 30 may be connected through an S1 interface.
- the MME provides a variety of functions including distribution of paging messages to base stations 20, security control, dormant mobility control, SAE bearer control, and encryption and integrity protection of non-access layer (NAS) signaling.
- the SAE gateway host provides various functions including end of plane packets and user plane switching for terminal 10 mobility support.
- MME / SAE gateway 30 is referred to herein simply as gateway. However, MME / SAE gateway 30 includes both MME and SAE gateways.
- a plurality of nodes may be connected between the base station 20 and the gateway 30 through the S1 interface.
- Base stations 20 may be interconnected via an X2 interface and neighboring base stations may have a mesh network structure having an X2 interface.
- the base station 20 selects the gateway 30, routes to the gateway during Radio Resource Control (RRC) activation, scheduling and transmission of paging messages, and broadcast channel (BCCH) information.
- RRC Radio Resource Control
- BCCH broadcast channel
- Functions such as scheduling and transmission of a mobile station, dynamic resource allocation for the terminals 10 on both uplink and downlink, configuration and preparation of base station measurements, radio bearer control, radio admission control (RAC), and connection mobility control in LTE_ACTIVE state. Can be done.
- Gateway 30 may perform functions such as paging transmission, LTE_IDLE state management, user plane encryption, system architecture evolution (SAE) bearer control, and encryption and integrity protection of non-access layer (NAS) signaling.
- SAE system architecture evolution
- NAS non-access layer
- the protocol layers are based on the lower three layers of the Open System Interconnect (OSI) standard model known in the art of communication systems, the first layer (L1), the second layer (L2) and the first layer. It can be divided into three layers (L3).
- OSI Open System Interconnect
- the physical layer which is the first layer (L1), provides an information transmission service to a higher layer by using a physical channel.
- the physical layer is connected to a medium access control (MAC) layer located at a higher level through a transport channel, and data is transmitted between the MAC layer and the physical layer through the transport channel. Data is transmitted through a physical channel between the physical layer of the transmitting end and the physical layer of the receiving end.
- MAC medium access control
- the MAC layer of the second layer (L2) provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the RLC layer of the second layer 2 (L2) supports reliable data transmission.
- the RLC layer is included as a functional block of the MAC layer.
- the Packet Data Convergence Protocol (PDCP) layer of the second layer (L2) performs a header compression function. Header compression allows efficient transmission of Internet Protocol (IP) packets, such as IPv4 or IPv6, over air interfaces with relatively small bandwidths.
- IP Internet Protocol
- the radio resource control (RRC) layer located at the lowest part of the third layer L3 is defined only in the control plane.
- the RRC layer controls logical channels, transport channels, and physical channels in connection with the setup, reconfiguration, and release of radio bearers (RBs).
- RB means a service provided by the second layer (L2) for data transmission between the terminal 10 and the E-UTRAN.
- the RLC and MAC layers may terminate at base station 20 and perform functions such as scheduling, automatic retransmission request (ARQ), and hybrid automatic retransmission request (HARQ).
- the PDCP layer terminates at base station 20 and may perform functions such as header compression, integrity protection, and encryption.
- the RLC and MAC layers terminate at base station 20 and perform the same function as in the control plane.
- the RRC layer may terminate at the base station 20 and perform functions such as broadcasting, paging, RRC connection management, radio bearer (RB) control, mobility functions, and terminal measurement reporting and control.
- the NAS control protocol terminates at the MME of the gateway 30 and SAE bearer management, authentication, LTE_IDLE mobility handling, paging transmission in LTE_IDLE state and signaling between the gateway and the terminal 10 Can perform functions such as security control for.
- the NAS control protocol can use three states.
- the LTE-DETACHED state is used when there is no RRC entity.
- the LTE_IDLE state is used when there is no RRC connection while storing the minimum terminal 10 information.
- the LTE_ACTIVE state is used when the RRC state is set.
- the RRC state is subdivided into RRC_IDLE and RRC_CONNECTED states.
- the terminal 10 performs a discontinuous reception (DRX) set by the NAS using a uniquely assigned ID in the tracking area. That is, the terminal 10 may receive a broadcast of system information and paging information by monitoring a paging signal at a specific paging opportunity every UE-specific paging DRX cycle.
- DRX discontinuous reception
- the terminal 10 may receive a broadcast of system information and paging information by monitoring a paging signal at a specific paging opportunity every UE-specific paging DRX cycle.
- no RRC context is stored in the base station.
- the UE 10 may transmit and / or receive data to / from a base station using an E-UTRAN RRC connection and a context in the E-UTRAN.
- the terminal 10 may report channel quality information and feedback information to the base station.
- the E-UTRAN knows the cell to which the terminal 10 belongs. Accordingly, the network may transmit and / or receive data to / from the terminal 10, control mobility, such as handover of the terminal, and perform cell measurement on neighbor cells.
- FIG. 5 illustrates a structure of a radio frame used in an E-UMTS system.
- the E-UMTS system uses a radio frame of 10 ms and one radio frame includes 10 subframes.
- one subframe consists of two consecutive slots.
- One slot is 0.5ms long.
- one subframe includes a plurality of symbols (eg, OFDM symbol, SC-FDMA symbol).
- One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers. Some symbols (eg, first symbols) of the plurality of symbols constituting the subframe may be used to transmit the L1 / L2 control information.
- a physical channel for transmitting L1 / L2 control information (eg, a physical downlink control channel (PDCCH)) includes a plurality of subframes on a time axis and a plurality of subcarriers on a frequency axis.
- PDCCH physical downlink control channel
- 6 illustrates a handover procedure defined in LTE. 6 shows a case in which the MME and the serving gateway are not changed.
- the detailed handover process is as follows and can refer to 3GPP Technical Specification (TS) 36.300.
- Step 0 The terminal context in the source base station eNB includes information regarding roaming restrictions given at connection establishment or recent TA update.
- Step 1 The source base station configures a terminal measurement process according to area restriction information.
- the measurements provided by the source base station may help to control the connection mobility of the terminal.
- Step 2 The terminal is triggered to send the measurement report according to the rules set by the (system information, etc.).
- Step 3 The source base station determines whether to handover the terminal based on the measurement report and RRM (Radio Resource Management) information.
- RRM Radio Resource Management
- Step 4 The source base station transmits information required for handover (HO) to the target base station through a handover request message.
- the information required for handover includes a terminal X2 signaling context reference, a terminal S1 EPC signaling context reference, a target cell ID, an RRC context including an identifier of a terminal (eg, a Cell Radio Network Temporary Identifier (C-RNTI)) in a source base station, and the like. It includes.
- C-RNTI Cell Radio Network Temporary Identifier
- Step 6 The target base station prepares a HO with L1 / L2 and sends a Handover Request Ack (ACKNOWLEDGE) message to the source base station.
- the handover request Ack message includes a transparent container (RRC message) that is transmitted to the terminal to perform handover.
- the container contains the new C-RNTI, the security algorithm identifier of the target base station.
- the container may further include additional parameters such as connection parameters, SIBs, and the like.
- the target base station divides the RA signatures into a non-contention based RA signature set (hereinafter, group 1) and a competition based RA signature set (hereinafter, group 2) in order to minimize handover delay, One of the group 1 may be selected and informed to the handover terminal. That is, the container may further include information about the dedicated RA signature. In addition, the container may also include information about the RACH slot duration to use the dedicated RA signature.
- Step 7 The source base station generates an RRC message (eg, RRCConnectionReconfiguration message) having the mobility control information for the terminal for handover and transmits it to the terminal.
- the RRCConnectionReconfiguration message contains parameters necessary for handover (eg, a new C-RNTI, a security algorithm identifier of the target base station, and optionally information on a dedicated RACH signature, a target base station SIB, etc.) and instructs HO to be performed.
- Step 8 The source base station transmits a serial number (SN) STATUS TRANSFER message to the target base station to transmit an uplink PDCP SN reception state and a downlink PDCP SN transmission state.
- SN serial number
- Step 9 After receiving the RRCConnectionReconfiguration message, the UE attempts to access the target cell using the RACH procedure.
- the RACH proceeds on a non-competition basis if a dedicated RACH preamble is assigned, otherwise proceeds on a contention basis.
- Step 10 The network performs uplink allocation and timing adjustment.
- Step 11 When the UE successfully accesses the target cell, the UE sends an RRCConnectionReconfigurationComplete message (C-RNTI) to confirm the handover and sends an uplink buffer status report to inform the target base station that the handover process is completed.
- C-RNTI RRCConnectionReconfigurationComplete message
- the target base station confirms the received C-RNTI through a Handover Confirm message and starts data transmission to the terminal.
- Step 12 The target base station sends a path switch message to the MME to inform that the terminal has changed the cell.
- Step 13 The MME sends a User Plane Update Request message to the serving gateway.
- Step 14 The serving gateway switches the downlink data path to the target side.
- the serving gateway transmits an end marker packet to the source base station through the existing path, and then releases user plane / TNL resources for the source base station.
- Step 15 The serving gateway sends a User Plane Update Response message to the MME.
- Step 16 The MME responds to the path switch message using the path switch Ack message.
- Step 17 The target base station sends a UE context release message to inform the source base station of the success of the HO and triggers resource release.
- Step 18 Upon receiving the terminal context release message, the source base station releases the radio resources and user plane related resources associated with the terminal context.
- 7 shows an example of performing communication in a carrier aggregation situation.
- 7 may correspond to an example of communication to an LTE-A (Advanced) system.
- the LTE-A system uses a carrier aggregation or bandwidth aggregation technique that collects a plurality of uplink / downlink frequency blocks and uses a larger uplink / downlink bandwidth to use a wider frequency band.
- Each frequency block is transmitted using a Component Carrier (CC).
- CC may mean a frequency block or a center carrier of a frequency block for carrier aggregation depending on the context, and they are mixed with each other.
- five 20 MHz CCs may be gathered in an uplink and a downlink to support a 100 MHz bandwidth.
- CCs may be contiguous or non-contiguous in the frequency domain.
- the radio frame structure illustrated in FIG. 5 may be equally applied even when using a multi-component carrier.
- FIG. 7 illustrates a case where both the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetrical. However, the bandwidth of each CC can be determined independently.
- the bandwidth of the UL CC may be configured as 5 MHz (UL CC0) + 20 MHz (UL CC1) + 20 MHz (UL CC2) + 20 MHz (UL CC3) + 5 MHz (UL CC4).
- asymmetrical carrier aggregation in which the number of UL CCs and the number of DL CCs are different is possible.
- Asymmetric carrier aggregation may occur due to the limitation of available frequency bands or may be artificially established by network configuration.
- the uplink signal and the downlink signal are illustrated as being transmitted through a one-to-one mapped CC, the CC in which the signal is actually transmitted may vary depending on the network configuration or the type of the signal.
- the CC to which the scheduling command is transmitted may be different from the CC to which data is transmitted according to the scheduling command.
- the uplink / downlink control information may be transmitted through a specific UL / DL CC regardless of mapping between CCs.
- the frequency band that a specific terminal can receive may be limited to M ( ⁇ N) CCs.
- Various parameters for carrier aggregation may be set in a cell-specific, UE group-specific, or UE-specific manner. Accordingly, when N CCs exist in a cell, the UE may receive a Physical Downlink Shared Channel (PDSCH) through all N CCs, but the base station may receive the PDSCH in a semi-static manner.
- PDSCH Physical Downlink Shared Channel
- One CC may be limited to M (M ⁇ N).
- Step 1 The terminal performs a cell search on a frequency raster of 100kHz or 300kHz.
- Step 2 When detecting a Synchronization Channel (SCH) from any one of the aggregated DL CCs, the terminal receives a physical broadcast channel (PBCH) in the DL CC. After receiving the PBCH, DL downlink bandwidth (BW), the number of Tx antennas, and a physical hybrid ARQ indication channel (PHICH) configuration are obtained. In addition, the terminal obtains system information (SI-2) through the DL CC from which the SCH is detected. As an example, UL EARFCN (E-UTRA Absolute Radio Frequency Channel Number), UL BW and various physical channel settings are obtained. In addition, after receiving the PBCH and SI-2, the UE obtains information about the UL CC linked with the DL CC. In the case of carrier aggregation systems, system information regarding DL and / or UL configuration (ie, aggregated CC configuration employed in a cell) is received through a single CC so that cell search complexity does not increase with system bandwidth. It is desirable to.
- PBCH
- Step 3 After cell searching and BCH reception, the UE performs random access to align the uplink timing and obtain a UE ID. To this end, the terminal transmits a RACH preamble (ie, a signature) on the UL CC based on the PRACH configuration of the system information received through the DL CC.
- a RACH preamble ie, a signature
- Step 4 The UE receives the RACH response message and sends a RACH message (MSG) 3 to the base station.
- MSG RACH message
- Step 5 The base station receives the RACH MSG 3 and transmits the RACH MSG 4 to the terminal.
- Step 6 After the conflict resolution is completed, the terminal receives the terminal-specific or terminal-common CC allocation information (ie, information on the assigned UL / DL CC) from the base station.
- CC allocation information may be delivered semi-statically through RRC signaling or dynamically delivered through L1 / L2 control signaling (eg, PDCCH).
- UE-specific CC allocation for any UE may be allocated through initial access to the serving cell and UE-specific RRC signaling and / or UE-specific L1 / L2 control signaling in the serving cell.
- the terminal-common CC assignment for any terminal may be assigned via cell (or eNB) -specific RRC signaling and / or a series of terminal-common L1 / L2 control signaling (eg, PDCCH).
- the UE-specific CC allocation information may include information for allocating one or more DL CCs and / or one or more UL CCs in different forms according to terminal capabilities.
- the UE-specific CC allocation information may include basic CC configuration information of the cell / base station (eg, CC index information of active DL CC / UL CCs for scheduling, and optionally DL CC-UL CC linkage information). Information) may include information for UE-specific overriding). For example, if the basic cell configuration is the same symmetrical form of DL / UL CCs and is linked 1: 1, new DL CC-UL CC linkage information may be informed for each terminal to allow asymmetric carrier aggregation. .
- Example 1-1 Handover in Carrier Aggregation
- the terminal performs communication using a CC allocated by the serving cell (S802 and S804).
- the CC assigned to the terminal is referred to as an active CC set for convenience.
- the CC may be allocated in a UE-specific, UE-common or cell-specific manner and may be allocated using, for example, RRC signaling and / or L1 / L2 control signaling.
- Component carrier allocation can be done dynamically and semi-dynamically through terminal-specific or terminal-common L1 / L2 control signaling.
- Component carrier allocation using L1 / L2 control signaling may override the component carrier allocated through RRC signaling.
- the UE performs neighbor cell measurement (S806) and reports the measurement result to the serving cell (S902).
- the base station of the serving cell makes a HO determination based on the measurement report of the terminal (S808), and transmits a handover request message to the target cell together with the UE context (S904).
- the target cell transmits a HO request response message to the serving cell (S906).
- the HO request response message includes basic information for the UE to perform initial transmission in the target cell. Specifically, the HO request response message includes information about a new C-RNTI, a portion of the handover command message and a dedicated signature (ie random access preamble) for non-competition based random access in the target cell.
- the HO request response message includes information related to the component carrier (CC) of the target cell.
- the CC related information includes DL CC and / or UL CC configuration information for initial access and / or initial transmission and reception in the target cell or DL CC and / or UL CC configuration information configured by the cell.
- the serving cell transmits a HO command message to the corresponding terminal (S810 and S908).
- the HO command message includes new C-RNTI, random access related information (eg, signature root sequence index, cyclic shift parameter, dedicated signature), and CC related information of the target cell.
- the terminal After obtaining the basic information for performing the initial transmission in the target cell through the HO command message, the terminal transmits a random access preamble (eg, a dedicated random access preamble) to the base station of the target cell (S812 and S910). Thereafter, the terminal synchronizes and performs information exchange process through message hand shaking with the target cell. This completes the entire handover process (S912 to S916).
- the UE may receive the UE-specific component carrier information from the target cell through RRC signaling and / or L1 / L2 control signaling (S814).
- Procedure 1 The UE measures a neighbor cell (S806 in FIG. 8).
- the UE may have two CC allocation schemes at the time of handover triggering.
- the UE when the handover triggering time is associated with the probability of the situation that the geometry on the channel of the UE is worsened, the UE may be switched to a single CC state on the downlink and / or the uplink at the time of the handover triggering. have.
- the transition to the single CC state may be performed through RRC signaling or L1 / L2 control signaling. That is, in the handover triggering state, the UE may be in a state in which carrier aggregation is not set (method A).
- Method A is the same as the neighbor cell search method in the existing LTE, and means that the intra-frequency measurement is preferentially performed through one DL CC.
- the CC allocation of the UE is determined by the RRC or the scheduler of the cell / base station, a specific situation may not be assumed as to whether the UE is carrier aggregation at the time of handover triggering. That is, the CC allocation of the UE at the time of handover triggering may be a carrier aggregation situation or a non-carrier aggregation situation (method B).
- neighbor cell measurement for handover may be performed simultaneously for all DL CC (s) (that is, active DL CC sets) allocated to the UE.
- the neighbor cell measurement is initially assigned by the current CC assignment or by all the DL CCs configured by the base station or by signaling or any appointment in advance.
- a plurality of preset DL CCs may be performed.
- neighboring cell measurement is given priority only to one or a plurality of some DL CCs among the corresponding DL CCs (ie, active DL CC sets). It can be done with Neighbor cell measurement may be performed only for the corresponding DL CC (s). In addition, when the appropriate cell is not found only with the corresponding DL CC (s), a process of searching for another CC band may be subsequently performed.
- the CC where the neighbor cell measurement is performed preferentially may be a UE-specific, cell-specific or cell-common DL CC (s) for handover, and for convenience the primary DL CC (s) or anchor DL CC (s).
- one or more primary or anchor DL CC may be set to be common in a series of cells.
- a primary CC or anchor CC There is a need for the definition of a primary CC or anchor CC described throughout the present invention.
- the definition of a primary or anchor UL CC basically means a UL CC configured and designated for uplink control information transmission, and may include a meaning of a UL CC that is a reference for uplink physical signal transmission as a broader meaning. Can be.
- a primary or anchor DL CC is a specific DL CC that is responsible for the transmission of control information for managing the connection with the corresponding terminal, which is the CC that is the default for CC reconfiguration, and for authentication and security purposes.
- Non-access stratum (NAS) information may be defined as a DL CC that delivers to the terminal. Meaning as DL CC for transmitting specific cell-specific, terminal-common control information or terminal-specific control information may be added thereto.
- the terminal transmits the measurement report to the serving cell (S902 of FIG. 9).
- the UE may transmit an individual measurement report in units of CC through a UL CC linked with a DL CC that performs neighbor cell measurement.
- signaling for triggering measurement may be performed through any designated one or more DL CC (s) (eg, primary or anchor CC) when there are a plurality of target DL CCs or individually signaled for each corresponding DL CC (s). May be In this case, measurement triggering may be independently set for each DL CC.
- the UE-specific or cell-specific primary or anchor DL CC is configured, the UE may transmit a measurement report to the UL CC linked with the DL CC.
- the UE may transmit a measurement report to the UL CC.
- one or more UL CC (s) for the measurement report may be explicitly (implicitly) or implicitly signaled or implicitly identified and designated by the terminal without additional signaling. If there are a plurality of candidate UL CCs for transmitting the measurement report, one or some UL CCs from the candidate UL CC set may be separately designated. In this case, signaling to the terminal (eg, RRC signaling or L1 / L2 control signaling) may be defined for designation.
- Measurement information for a plurality of DL CCs may be joint coded or separately coded (separated or repeated).
- the measurement report is transmitted from the terminal on the reporting time point configured in the base station and may be transmitted using one or more uplink subframes.
- the serving cell when the serving cell sends a HO request message to the target cell after determining the HO based on the measurement report of the UE, DL CC and / or UL CC configuration information and / or specific primary or The anchor DL CC and / or UL CC configuration information may be sent together to share the CC configuration of the UE with the target cell during handover.
- the target cell may allocate one or a plurality of UL CCs for initial access or initial transmission / reception to the corresponding terminal based on the information from the serving cell.
- the target cell designates the required number of (dedicated) PRACH preamble resources for the UE and Feedback to the serving cell.
- the serving cell transmits a HO command to the corresponding UE (S810 of FIG. 8 and S908 of FIG. 9).
- the base station of the serving cell generates HO command information based on the handover related information received from the target cell, transmits it to the corresponding terminal, and starts releasing the corresponding terminal related connection of the serving cell from the upper layer.
- the target cell may allocate one or more DL CCs and / or one or more UL CCs to provide continuity in quality of service for the handover terminal and these information may be included in the HO command message.
- the CC allocation information of the target cell may be used for initial access to the target cell and / or subsequent initial transmission and reception.
- the HO command message may directly include information (eg, index) indicating one or more DL CCs and / or one or more UL CCs.
- the HO command message may include additional information associated with CC allocation of the target cell if necessary.
- the additional information may include UL CC configuration information and PRACH preamble resource information for PRACH preamble transmission. For example, when a plurality of UL CCs are allocated and a (dedicated) PRACH preamble transmission is performed through one UL CC, UL CC index information and (dedicated) PRACH preamble resource information for PRACH preamble transmission may be included.
- the additional information may include a plurality of (dedicated) PRACH preamble resource information and, if necessary, associated with the UL CC or when the (dedicated) PRACH preamble is transmitted to a plurality of UL CCs (eg, in case of non-continuous CC allocation). It may be UL CC index information.
- the UL CC index information and the (dedicated) PRACH preamble resource information may be included in the HO command message as one information.
- the PRACH preamble resource information includes a signature root sequence index, a cyclic shift parameter, and a dedicated signature.
- the sequence for signature includes a CAZAC sequence and a Zadoff-chu sequence.
- One or more UL CCs of the target cell may be configured using, for example, a HO command message and / or UL CC information set in an existing serving cell.
- the number / targets of UL CCs that transmit the dedicated PRACH preamble sequence may be embodied through a separate UL (or UL / DL) CC setup procedure associated with the RACH.
- the UL dedicated PRACH preamble may be transmitted separately from a limited number (including one) of the UL CCs configured in the target cell / target CC without additional CC configuration for the RACH.
- the UL CC configuration information may be explicitly signaled through a HO command message (eg, an index) or indirectly confirmed using DL CC configuration information. For example, only the DL CC is explicitly informed through the HO command message, and the information of the UL CC may be grasped by the corresponding UE based on CC information in the serving cell or information implicitly obtained from the HO command message.
- the UL CC may be a UL CC linked to the DL CC set by the HO command message (this link relationship may be a link relationship established in a previous serving cell or may be a common link relationship for a plurality of cells).
- the UL CC may be a primary or anchor UL CC associated with the primary or anchor DL CC or optionally set independently.
- the HO command since the HO command is received and the access to the target cell proceeds, the information on the UE-specific multi-CC assignment need not be completely transmitted to the HO command. Therefore, the HO command only needs to transmit single DL / UL CC allocation information for accessing the target cell.
- the HO command may transmit only information on a single DL CC and the UE may obtain information about a UL CC linked after receiving system information from the corresponding DL CC of the target cell.
- the single DL CC allocated through the HO command may be the primary or anchor DL CC of the target cell. Meanwhile, the cell-specific CC configuration information of the target cell may be informed through the HO command.
- the DL CC for initial transmission and reception between the target cell and the terminal during handover may not be separately designated by the HO command message.
- the DL CC for initial transmission / reception may be a DL CC that has performed measurement on the corresponding cell or may be one of DL CCs or DL CCs to which a HO command message is issued. As another case, it may be a series of primary or anchor DL CCs set in the serving cell.
- the HO command may be configured to induce operations on a single DL CC and a single UL CC in subsequent target cell operations for the purpose of minimizing changes to the existing LTE handover process and reducing overhead of the handover process itself.
- the HO command message may be configured with the same information as the existing LTE.
- the HO command may include an index of a DL CC and / or a UL CC that is set in a single multiple DL / UL CC situation.
- the configuration of the UL CC may include index information of the corresponding UL CC in the HO command message.
- this may be a DL CC configured through a HO command message and a UL CC configured with linkage.
- the linkage applied may be a linkage set in the serving cell or a specific linkage set in common among a plurality of arbitrary cells.
- it may be a UL CC linked with any primary or anchor DL CC (s), and optionally, one or more primary or anchor UL CCs may be separately configured and set.
- a plurality of DL CCs and / or UL CCs may be configured for the initial operation of the target cell without any separate instruction by the HO command message.
- the setting method may use a setting state of a plurality of DL CCs and / or UL CCs of a serving cell as it is, or use a setting state of a plurality of primary DL CCs and / or primary UL CCs.
- the most basic is a method of transmitting all the one or more DL CCs set in the corresponding UE at that time. This may be a method of satisfying the transmission reliability of the HO command message.
- the HO command may be sent on the primary or anchor DL CC, and the number of primary or anchor DL CCs may be plural.
- the primary or anchor DL CC may be configured in a terminal-specific, cell-specific or cell-common manner for handover.
- the transmission timing for each DL CC may be basically the same. However, considering the processing load, the transmission timing may be set differently at a subframe level.
- a HO command message may be transmitted only to one DL CC (eg, a primary (anchor) DL CC or a DL CC performing neighbor cell measurement). Can be.
- the HO command may be transmitted on all or some of the plurality of DL CCs among all DL CCs set as the active CC set.
- Configuration information of one or a plurality of DL CCs and / or one or a plurality of UL CCs supporting an operation of performing access to a target cell may be included in the HO command message.
- the DL CC set at this time may be the primary DL CC of the target cell.
- the UL CC set may be the primary UL CC of the target cell.
- the designation of the primary DL CC and / or the designation of the primary UL CC of the above-described attribute of the present invention are HO commands. Can be included in the message.
- Step 4 The terminal transmits a random access preamble to the target base station (S812 of FIG. 8 and S910 of FIG. 9).
- the UE uses a (dedicated) random access preamble (dedicated) random access preamble related information allocated through a HO command message (dedicated) PRACH preamble (dedicated) PRACH preamble through one or a plurality of UL CCs of the target cell Can be transmitted.
- the information (eg, number and / or index of UL CCs) for transmitting the (dedicated) PRACH preamble may be embodied through a process of configuring a UL CC or DL CC / UL CC in a target cell during a HO process. And may configure (eg, number and / or index) information of a UL CC for separate (dedicated) PRACH preamble transmission to the UE.
- the UE may receive UL CC index information and (dedicated) PRACH preamble resource information for PRACH transmission through a HO command message and then transmit the corresponding (dedicated) PRACH preamble through a designated UL CC
- the UE may check UL CC information (eg, index) for this through a HO command message.
- UL CC information eg, index
- the UL CC information may be directly included in the HO command message or may be configured as specific PRACH preamble transmission resource information in association with (dedicated) RACH preamble resource information transmitted to the terminal through the HO command message.
- the CC configuration for the corresponding UE from the serving cell at the time of handover and a set of one or more primary CC settings UL CC configuration in the target cell may be made based on the information.
- prior sharing of information between the serving cell and the target cell may be premised.
- the target cell may blindly detect a (dedicated) PRACH preamble signal of a corresponding UE for UL CCs configured by the target cell. You may.
- the serving cell when the serving cell sends a HO request message to the target cell after the serving cell determines the HO based on the measurement report from the terminal, the DL CC for the corresponding UE at that time / UL CC configuration information and / or specific primary or anchor DL / UL CC configuration information may be sent together to enable the target cell to share the carrier configuration in the serving cell for the UE at handover.
- the target cell designates the required number of (dedicated) PRACH preamble resources based on information shared from the serving cell.
- the serving cell which feeds back to the cell and receives it, may deliver the terminal to the terminal through a HO command message.
- a UL CC configuration transmitted by a corresponding UE in a target cell may be made based on information on a CC configuration and at least one primary CC configuration from a serving cell at a handover time. have.
- UL CC configuration information may be shared in advance between the serving cell and the target cell.
- the target cell may detect a dedicated PRACH preamble of the corresponding UE through blind detection for each UL CC without sharing information with the serving cell.
- the terminal performs synchronization with the target cell and the handover process ends (S912 and S914 of FIG. 9).
- the terminal When the HO through the non-competition based RA process (that is, using a dedicated RA preamble) fails, the terminal performs synchronization with the target cell through the contention-based RA process. After completion of the handover with the target cell, the target cell transmits a HO complete message to the serving cell, and the serving cell which has received this ends all the connection of the user / control plane with the corresponding terminal and the connection state for each CC Quit.
- the target cell configures a DL CC and / or a UL CC to the handed over UE (S814 of FIG. 8).
- the UE may transmit and receive data / control information with the target cell through the DL / UL CC (s) assigned in the handover process (eg, HO command message, RA process).
- the target cell signals the DL / UL CC allocation information through UE-specific (or cell-specific) RRC signaling and / or UE-specific (or cell-specific) L1 / L2 control signaling to update the CC allocation for the UE. can do.
- the CC allocation information may be included in a response message for one or a plurality of (dedicated) RACH transmissions, and may be separately signaled in a response message transmission or subsequent process of the terminal.
- the configuration, configuration, and signaling scheme for the DL / UL CC on the end of the handover in the target cell may be implemented in the same manner as the CC is allocated to the UE in the serving cell before the handover.
- the CC allocation information may directly include information (eg, index) indicating one or more DL CCs and / or one or more UL CCs.
- the UL CC configuration information may be explicitly signaled or indirectly confirmed using the DL CC configuration information.
- the information of the UL CC may be indirectly confirmed using a DL CC-UL CC linkage relationship.
- Proposals related to the configuration, configuration, and signaling of the DL CC and / or UL CC for the UE before and after the handover process in steps 1 to 6 may be performed individually or in combination or in whole.
- Examples 1-1 and 1-2 may be used together or independently.
- the basic concept in the conventional handover process leaves the serving cell after the UE receives the HO command.
- the UE may perform HO only for some (eg, one) CCs among the plurality of CCs. That is, if a terminal uses two DL CCs and two UL CCs, and the terminal has only two capabilities, some DL / UL CCs perform HO and the remaining DL / UL CCs continue to serve the serving cell. You can give and receive.
- the DL / UL CC performing the HO may be a primary CC or an anchor CC.
- the UE which has successfully connected with the target cell, may transmit and receive data with the target cell through a DL / UL CC set configured from the target cell at the time of HO. Thereafter, the remaining DL / UL CC that the terminal will use in the target cell may be additionally configured through (terminal-specific) carrier aggregation in the target cell.
- the target cell may transmit a message (eg, a HO confirm message) indicating that the handover is successfully completed to the serving cell.
- the serving cell may give signaling to the UE to terminate the connection for the remaining DL / UL CCs connected with the serving cell.
- the UE may again receive the UE-specific DL / UL CC assignment from the target cell through the DL / UL CCs used in the HO.
- the UE targets the DL / UL CC used in the serving cell or related CCs at the time of HO. Can be used in cells.
- the base station allocates DL / UL CCs according to the capability of the terminal, but the base station does not always allocate as many DL / UL CCs as the capability of the terminal. Alternatively, there may be CCs assigned to the terminal but not used. If the UE has more capabilities but there are CCs not being used in the serving cell, the UE may perform HO using DL / UL CCs corresponding to the remaining capabilities. That is, downlink physical signal / physical channel reception and uplink physical signal / physical channel transmission of a terminal required in a HO process may be performed using the corresponding DL / UL CC.
- the UE may access the target cell through the corresponding primary CC. If the primary DL CC or the primary UL CC is aggregated in the serving cell, the base station may select the corresponding primary CC as the CC for the HO.
- Embodiment 1 assume that the handover process of the UE is the same as the handover process defined in the existing LTE.
- CoMPs co-ordinated multiple points
- LTE-A co-ordinated multiple points
- transmission or soft handover a kind of CoMP.
- the downlink or uplink CoMP situation may be assumed before the handover preparation process or the start of the handover preparation process.
- CoMP is used as a concept including soft handover.
- Option 1 is when the CoMP transmission mode is set before the handover preparation process.
- Option 2 is when the CoMP transmission mode is set after the handover preparation process is triggered.
- the downlink and / or uplink CoMP mode may be set during the handover preparation process.
- the CoMP mode may be set before or after the neighboring cell measurement process.
- the connection with the serving cell may be terminated at any time based on the reference signal received power (RSRP) and / or reference signal received quality (RSRQ) of the serving cell.
- RSRP reference signal received power
- RSRQ reference signal received quality
- option 2 the procedure illustrated in Embodiment 1 may be applied to the handover procedure before setting the CoMP mode.
- the handover processes for the corresponding UE after the CoMP mode configuration may be applied by configuring the entire handover process in a form in which the suggestions of Option 1 described above are applied.
- Option 1 is based on the assumption that the UE is connected with one or more neighbor cells before handover. Therefore, the neighbor cell measurement of the handover preparation process may be replaced with the measurement of the measurement cell set in the CoMP mode based on the RSRP or RSRQ trend of the serving cell.
- the DL CC configuration, configuration, and signaling method for the UE may be applied to the neighbor cell measurement illustrated in S806 of FIG. 8.
- the neighbor cell measurement process for handover may be performed separately from the CoMP measurement based on the difference between the target cell for measuring the CoMP and the neighbor cell or the property of the measurement itself.
- Neighbor cell specification may apply to the neighbor cell measurement illustrated in S806 of FIG. 8 according to the present invention.
- the measurement reporting process for handover may be replaced with a reporting process of measurement results for a reporting cell set in CoMP mode.
- the signaling methods for DL CC and / or UL CC configuration, configuration, and configuration for the UE for CoMP measurement report may be applied to the examples illustrated in process 2 (S902 of FIG. 9) of the first embodiment.
- a measurement reporting process for handover may be defined separately from a CoMP measurement reporting process based on a difference between CoMP and handover in a target of a cell to be reported or a difference in measurement attributes to be reported.
- the CoMP measurement reporting process may apply the CC configuration, configuration, and signaling method illustrated in process 2 (S902 of FIG. 9) of the first embodiment.
- CoMP mode As CoMP mode is set for any UE, one of one or more cells in an active cell set on a DL CoMP or UL CoMP that directly or indirectly participates in transmission and reception is targeted in a HO determination process of a serving cell. It can be set to a cell.
- downlink transmission of the HO command message, transmission of a (dedicated) PRACH preamble sequence between the target cell and the corresponding UE, and a response thereto may be excluded.
- a CC allocation process eg, process 6 of Embodiment 1 for a corresponding UE accompanying a frequency aggregation situation may be excluded.
- the serving cell may indicate to the terminal that the connection with the serving cell is terminated through separate RRC signaling or L1 / L2 signaling (eg, termination). indicator).
- a method of transmitting a HO command message in the first embodiment may be applied to the DL CC to which the termination indicator is transmitted.
- the serving cell may send a HO request message to the target cell, and the target cell may send a response to the serving cell.
- the serving cell instructs the terminal to terminate the connection with the serving cell through separate RRC signaling or L1 / L2 signaling, the terminal immediately transmits the target cell on the serving cell and / or CoMP from the designated time. It can be recognized as an anchor cell.
- the message indicating that the connection with the serving cell is terminated through the RRC signaling may be defined as another new message format for the LTE-A terminal as compared to the HO command message format that does not assume CoMP.
- any of the HO command message transmission methods proposed in Embodiment 1 may be applied.
- any cell in the downlink active set may be configured as a target cell during HO determination of the serving cell.
- the HO command transmission method described in Embodiment 1 and the subsequent processes may be applied as the process after the HO determination process in this case including the proposals for DL CC and UL CC configuration.
- the modified HO command message without the downlink connection related information may be considered. This may be applied by replacing a HO command message with a new message having a different format.
- the UE may transmit a (dedicated) PRACH preamble to the target cell, receive a response message thereto, and optionally, DL CC and / or UL CC configuration for the UE.
- the response message for the transmission of the (dedicated) PRACH preamble sequence may exclude at least a part of target cell related information for downlink connection establishment. The above-described proposed scheme may be applied even when downlink CoMP is applied in which an active cell set is not signaled to the terminal.
- an uplink CoMP transmission mode may be applied (this includes a case in which downlink CoMP operates as a terminal transparent CoMP, in which case an uplink CoMP active set may or may not be set).
- the uplink CoMP mode includes a case where reception synchronization is matched and a case where it is not matched. Basically, it may be considered to apply the HO command message transmission method and the following processes in the above-described embodiment 1. If reception synchronization between the UE and the target cell is matched, transmission of the (dedicated) PRACH preamble sequence may be excluded, and thus, the (dedicated) PRACH preamble resource information may be excluded from the HO command message. However, it may be desirable to transmit a (dedicated) PRACH preamble sequence for the purpose of deriving a target cell access time and a subsequent response message of the corresponding UE.
- handover is the switching of a reference cell (referred to as a downlink or uplink CoMP anchor cell for convenience) in downlink and / or uplink transmitting control information in CoMP. It can be implemented as.
- the process for this can be defined as follows.
- Step 1 Determine handover or anchor cell switching on the CoMP anchor cell based on measurement on CoMP or measurement report results triggered separately based on the trend of RSRP or RSRQ.
- Step 2 Instructing the target cell or new anchor cell switching candidate configured at this time to instruct CoMP anchor cell switching and providing a message including profile information of the UE from the serving anchor cell to the target CoMP anchor cell (or target cell, anchor cell switch candidate) To send.
- Profile information includes information necessary for setting a new CoMP anchor cell.
- the profile information may also include DL / UL CC configuration of the terminal as a series of terminal-specific information.
- Process 3 As a response to process 2, a message including information necessary for the UE for establishing a new CoMP anchor cell is transmitted from the target CoMP anchor cell to the serving CoMP anchor cell.
- Step 4 The serving CoMP anchor cell receiving the message of step 3 transmits a series of CoMP anchor cell switching messages to the terminal.
- the message may apply the configuration, configuration, signaling scheme, etc. of the CC illustrated in process 3 of the first embodiment.
- Step 5 After receiving the message of step 4, the UE can transmit an uplink control channel or an uplink shared channel with a separate ACK / NACK signal confirming correct reception thereof or transmit a (dedicated) PRACH preamble sequence. have. Resource information for this may be delivered to the terminal from the target CoMP anchor cell through the process 3 and process 4. Thereafter, the target CoMP anchor cell transmits a message (CoMP anchor cell switching complete message) indicating that CoMP anchor cell switching is completed to the serving CoMP anchor cell. After the serving CoMP anchor cell receives the CoMP anchor cell switching complete message, the serving CoMP anchor cell completes the entire CoMP anchor cell switching process by releasing the anchor role and connection to the corresponding UE.
- a message CoMP anchor cell switching complete message
- a response to this is additionally transmitted from the target CoMP anchor cell to the corresponding terminal, and the terminal receiving the transmission transmits ACK / NACK. Can be added before the completion message is generated.
- the downlink ACK / NACK for this is performed by the CoMP anchor cell of the target CoMP anchor cell. It may be added before generating the switching complete message.
- Proposals for the handover process of the UE to which the CoMP transmission mode described and a series of configuration of the DL CC / UL CC configuration and signaling schemes are applied to each other as a separate scheme may be applied in a combination of arbitrary schemes. Can be.
- Embodiment 3 Detailed Carrier Aggregation Configuration Method Related to Handover
- the following three factors may be considered as carrier aggregation related configuration schemes that can be considered in the HO process.
- the CC can perform basic access, cell discovery, and system information transmission process for a terminal on a cell, a base station, or a relay node by itself.
- a CC can be defined as a stand-alone CC.
- a CC having a non-stand-alone feature that does not support the above processes may be defined as an extension CC.
- the extended CC may not transmit a Primary Synchronization Signal (PSS) / Secondary Synchronization Signal (SSS) / P-BCH and may not transmit a Dynamic Broadcast Channel (DBCH) for transmitting system information and a common PDCCH thereof.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- DBCH Dynamic Broadcast Channel
- the DL channel allocation PDCCH and UL grant PDCCH defined in Rel-8 LTE may not be transmitted. Accordingly, it is not necessary to set a transmission region of the PDCCH defined in LTE Rel-8 and a CRS (Cell specific reference signal set in LTE Rel-8), and a CFI (Control Format Indicator) indicating this is required. As it disappears, the Physical Control Format Indicator Channel (PCFICH) defined in LTE Rel-8 does not need to be transmitted.
- the bandwidth of the extended CC can be considered as basically having the scalable BW of LTE Rel-8, but can be defined as another bandwidth based on the purpose of utilizing a specific residual resource. Similarly, as a specific frequency resource region within the CC, a resource region excluding the entire matter, some physical channels, or physical signals described in the extended CC may be defined as a segment.
- Element 2 Cross-CC Scheduling for Carrier Aggregation
- the PDCCH i.e., DL channel allocation PDCCH
- the DL CC may be transmitted through a different DL CC. This is defined as downlink cross-CC scheduling or downlink cross-carrier scheduling.
- the PDCCH (that is, the UL grant PDCCH) for scheduling the PUSCH may be a PUCCH. It may be received through a DL CC that is not linked with the UL CC being transmitted. This is defined as uplink cross-CC scheduling.
- one or more specific DL CC (s) for transmitting DL channel allocation or UL grant PDCCH may be configured cell-specifically or terminal-specifically. This particular DL CC (s) may be referred to as a primary DL CC or an anchor DL CC.
- one or more specific DL CC (s) transmitting DL channel allocation or UL grant PDCCH may be configured as a UE-specific or cell (or relay node) -specific PDCCH monitoring CC set.
- Element 3 Dynamic / Semi-Static CC Active / Inactive
- UE (or relay node as receiving entity) -Update of DL / UL active CC set specifically set or activation for DL CC (s) or UL CC (s) set to DL / UL active CC set / Deactivation can be dynamically instructed via PDCCH or MAC messaging, or semi-statically activated using cell (or relay node as sender) -specific or terminal (or relay node as recipient) -specific RRC signaling Can be.
- neighbor cell measurement may not be possible for any extended CC as an operation of an LTE Rel-8 / 9 terminal or an Rel-10 LTE-A terminal.
- the configuration of the extended CC may be different for each cell (or relay node as a transmitting entity). In consideration of this, the following various methods can be applied.
- Scheme 1 Assume manner A of Example 1. That is, assume that carrier aggregation is not applied when measuring neighbor cells for HO (single DL CC-UL CC). Assuming that the serving DL CC of the serving cell is the extended DL CC of the neighboring cell, an optimal cell or frequency assignment (FA) is set when priority is set for intra-frequency measurement as in the LTE Rel-8 system. The CC may not be able to trigger the HO. Assuming a situation in which an extended CC is cell-specifically configured, a series of coordinations or special operations on the CC configuration may be defined to effectively perform neighbor cell measurement. For example, before performing neighbor cell measurement for the HO, active camping may be performed to a specific DL CC configured by the serving cell.
- FA optimal cell or frequency assignment
- a method of allocating a specific DL CC set to a cell (or a relay node as a transmitting entity) -specifically when allocating a single CC may be applied.
- the target DL CC may be coordinated at the time of DL CC configuration with a DL CC not configured as an extended CC in an adjacent cell (or a relay node as a transmitting entity).
- cell boundary terminals may be concentrated in a specific DL CC to cause high interference.
- a plurality of DL CCs that are specifically configured for a cell (or a relay node as a transmitter) may be defined.
- the UE when active camping with a specific DL CC or allocating a single CC before performing neighboring cell measurement for the HO, the UE (or a relay node as a downlink receiver) -specific DL CC may be configured.
- one or more DL CCs as targets may be adjusted in advance when the DL CC is configured as a DL CC that is not configured as an extended CC in an adjacent cell (or a relay node as a transmitting entity).
- the UE may inform the UE of the information about the extended CC configuration in the neighbor cell before the neighbor cell measurement.
- the UE may inform the UE of the configuration of the measurable DL CCs (not the CC index information) instead of the extended CC.
- the information about the CC index in the above two cases may be included as a parameter in the neighbor cell list or defined as a separate parameter, and may be broadcast to the terminals through the serving cell. This is a scheme for allowing a network operator to give a degree of freedom to the CC configuration for each cell, which may reduce latency or complexity / expense of a terminal when measuring neighboring cells.
- Scheme 2 Assume the case of scheme B of Example 1. That is, it is assumed that carrier aggregation (multiple DL CC configuration) is applied when measuring neighbor cells for HO. Assuming that all or some of the serving DL CCs of the serving cell are the extended CCs of the neighboring cell, all DL CCs set at the time of neighboring cell measurement can be defined as an intra-frequency measurement object, and are specifically set or set. Intra-frequency neighbor cell measurement may be performed through a DL CC set as a primary or anchor CC of the N-B.
- a method of allocating a specific DL CC set to a cell (or a relay node as a transmitting entity) -specifically may be applied.
- the specific DL CC may be set by updating the active DL CC set through UE-specific RRC signaling or PDCCH.
- a specific DL CC may be set by leaving only a specific DL CC active and deactivating the remaining DL CCs.
- the target DL CC may be adjusted when the DL CC is configured as a DL CC not configured as an extended CC in an adjacent cell (or a relay node as a transmitting entity).
- cell boundary terminals may be concentrated in a specific DL CC to cause high interference.
- a plurality of DL CCs that can be specifically configured can be defined as a cell (or a relay node as a transmitting entity).
- the UE (or a relay node as a downlink receiver) -specific DL CC may be configured.
- one or more DL CCs as targets may be adjusted when the DL CC is configured in advance as a DL CC that is not configured as an extended CC in a relay node as a neighboring cell or a transmitting entity.
- the UE may inform the UE of the information about the extended CC configuration in the neighbor cell before the neighbor cell measurement.
- the UE may inform the UE of the configuration of the measurable DL CCs (not the CC index information) instead of the extended CC.
- the information about the CC index may be included as a parameter in a neighbor cell list or defined as a separate parameter, and may be broadcast to terminals through a serving cell. This is a scheme for allowing a network operator to give a degree of freedom to the CC configuration for each cell, which may reduce latency or complexity / expense of a terminal when measuring neighboring cells.
- the method for transmitting the HO command may apply any of the methods described above on the present invention.
- a method of excluding and configuring an extended CC in configuring corresponding DL CCs may be applied.
- a method of not applying cross-CC scheduling regardless of whether the HO command message is transmitted may be considered.
- the information about the extended CC configured by the target cell may be informed as a parameter that the UE can distinguish.
- the UE may inform this with a parameter so as to distinguish the terminal.
- the configuration of the extended CC for the HO terminals is set to the terminal (or relay node as a receiving entity) -specific RRC signaling after the entire HO process is completed, and the DL CC configured at the HO command is the extended CC.
- Other stand-alone DL CCs may be configured as a backing DL CC or a non-backing DL CC.
- a HO related message (eg, a HO command message or a (dedicated) PRACH preamble transmission)
- cross-CC scheduling may be applied together.
- the consideration is whether to transmit a HO-related message on one DL CC or a HO-related message on a plurality of DL CCs.
- a detailed scheme for downlink transmission of the HO-related message is proposed as follows.
- Method 1 A method of deactivating cross-CC scheduling at any time before sending a HO command message and transmitting a DL channel allocation PDCCH associated with the DL CC through which the PDSCH of the HO command message is transmitted may be considered.
- the HO command message may be transmitted to a specially configured DL CC (eg, primary or anchor CC) when a plurality of DL CCs are configured.
- DL channel allocation PDCCHs must be generated and transmitted by the number of individual PDSCHs.
- each DL channel allocation PDCCH may be basically transmitted through a DL CC through which a PDSCH is transmitted.
- the DL channel allocation PDCCH for all PDSCHs may be transmitted in a specially designated DL CC (eg, primary CC, anchor CC).
- a specially designated DL CC eg, primary CC, anchor CC.
- the DL CC through which the DL channel allocation PDCCH is transmitted may be a specially designated DL CC (eg, primary CC, anchor CC).
- Method 2 It may be assumed that cross-carrier scheduling is still activated at the time of sending the HO command message. That is, it may be assumed that the CC indication field is set in the Downlink Channel Information (DCI) format of the DL channel allocation PDCCH for all PDSCH transmissions including HO command message transmission. In this case, it is possible to consider which DL CC to transmit the HO command message.
- the HO command message may be transmitted through a specific DL CC (eg, primary CC, anchor CC), and the specific DL CC may be a CC defined as a DL CC transmitting a PDCCH.
- the specific DL CC may be a DL CC set in the PDCCH monitoring CC set (if defined).
- each DL channel allocation PDCCH is basically determined according to the rule of the DL CC to which the PDSCH is transmitted and the rule of cross-CC scheduling, that is, the rule indicating the transmission CC of the associated scheduling PDSCH according to the CC indication field in the PDCCH. It may be transmitted through the DL CC.
- the DL channel allocation PDCCH for all PDSCHs may be transmitted in a specially designated DL CC (eg, primary CC, anchor CC), which may be different from the rules of cross-CC scheduling.
- one DL channel allocation PDCCH may be transmitted for a plurality of HO command message (PDSCH) transmissions.
- the DL CC through which the DL channel allocation PDCCH is transmitted may be a specially designated DL CC (eg, primary CC, anchor CC).
- the DL scheduling configuration configured and received from the target cell and the PDCCH transmission DL CC of the UL grant message are transmitted to the physical channel / physical signal reception DL CC of the UE and
- the serving cell may be included in the HO command message and transmitted to the terminal.
- the PDCCH transmission DL CC may be configured in the same manner as the primary DL CC described in the present invention, and may be indicated by one parameter signaling for setting of a related DL CC when the UE is already familiar with the present matter.
- a transmission method applied as a method of transmitting a HO command message may be equally applied to a response message. That is, when a PDSCH carrying a response message is transmitted through one DL CC, the DL CC may be a DL CC linked to a UL CC transmitting a dedicated PRACH preamble or a DL CC specifically designated regardless of the UL CC (eg, Fry). Head or anchor DL CC).
- cross-CC scheduling may not be applied until the HO process is terminated in the target cell and configuration through separate RRC signaling is performed. That is, the method of transmitting the PDCCH to the DL CC transmitting the PDSCH may be applied.
- the PDCCH and the associated PDSCH may be independently transmitted to the DL CC (s) determined according to the cross-CC scheduling rule.
- a method in which a response message is transmitted through PDSCHs on a plurality of DL CCs may be considered.
- the detailed DL channel allocation PDCCH application method may apply the same detailed methods described in relation to the HO command message transmission.
- CC configuration may be managed dynamically or semi-dynamically during the HO process through CC activation / deactivation based on the PDCCH.
- CC activation / deactivation may be used to designate one or more DL CC (s) to be measured within an active DL CC set in a neighbor cell measurement process.
- CC activation / deactivation may be used to specify one or more DL CC (s) to be applied to the HO command message transmission. For example, when the active DL CC set is set to M DL CCs, N ( ⁇ M) DL CCs used for transmitting (intra-frequency) neighbor cell measurement or DL CCs used for transmitting a HO command message are set. In order to do this, the remaining DL CCs may be deactivated.
- the target cell designates a plurality of DL CCs to the HO terminal through a HO command message
- an explicit parameter designation for deactivating the remaining DL CC (s) may be transmitted together through the HO command message.
- the UE may understand that the remaining DL CC (s) except for a specially designated DL CC (eg, primary or anchor CC) among DL CCs configured through the HO command message are inactivated.
- the terminal 10 is a block diagram of the terminal 10.
- the terminal 10 includes a processor (or digital signal processor) 1010, an RF module 1035, a power management module 1005, an antenna 1040, a battery 1055, a display 1015, a keypad 1020, and a memory. 1030, SIM card 1025 (may be optional), speaker 1045, and microphone 1050.
- the user may enter information such as a telephone number by pressing buttons on the keypad 1020 or by voice driving using the microphone 1050.
- Microprocessor 1010 may perform the appropriate function, such as receiving and processing indication information to dial a telephone number.
- Operational data may be extracted from subscriber identifier module (SIM) card 1025 or memory module 1030.
- SIM subscriber identifier module
- the processor 1010 may display instructions and operation information on the display 1015 for the user's reference and convenience.
- the processor 1010 provides the indication information to the RF module 1035 to initiate communication, for example, sending a wireless signal that includes voice communication data.
- the RF module 1035 includes a receiver and a transmitter for receiving and transmitting a radio signal.
- Antenna 1041 facilitates the transmission and reception of wireless signals.
- the RF module 1035 Upon receiving the wireless signal, the RF module 1035 forwards and converts the signal to baseband frequency for processing by the processor 1010.
- the processed signal is converted into audible or readable information and output through, for example, a speaker 1045.
- Processor 1010 includes protocols and functions necessary to perform the various processes described herein.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- embodiments of the present invention have been mainly described based on data transmission / reception relations between a terminal and a base station.
- Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
- a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
- the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the present invention can be applied to a wireless communication system supporting carrier aggregation. Specifically, the present invention can be applied to a method and apparatus for performing handover.
Abstract
Description
Claims (8)
- 반송파 집성(carrier aggregation)을 지원하는 무선 이동 통신 시스템에서 단말이 핸드오버를 수행하는 방법에 있어서,타겟 셀에 대한 측정 보고를 서빙 셀로 전송하는 단계;시그너처 루트 시퀀스 인덱스, 사이클릭 쉬프트 파라미터 및 타겟 셀의 콤포넌트 반송파 관련 정보를 포함하는 메시지를 상기 서빙 셀로부터 수신하는 단계;상기 시그너처 루트 시퀀스 인덱스 및 사이클릭 쉬프트 파라미터에 기초하여 생성된 경쟁-기반 시그너처를 확인하는 단계; 및상기 콤포넌트 반송파 관련 정보에 기초하여, 하나 이상의 콤포넌트 반송파를 통해 상기 경쟁-기반 시그너처 중 하나를 랜덤 억세스를 위해 상기 타겟 셀로 전송하는 단계를 포함하는 핸드오버 수행 방법.
- 제1항에 있어서,상기 콤포넌트 반송파 관련 정보는 상기 타겟 셀에서 상기 단말에게 지정한 콤포넌트 반송파 할당 정보를 포함하는 것을 특징으로 하는 핸드오버 수행 방법.
- 제2항에 있어서,상기 콤포넌트 반송파 할당 정보는 상기 랜덤 억세스를 수행하는 상향링크 콤포넌트 반송파와 관련된 인덱스 정보를 포함하는 것을 특징으로 하는 핸드오버 수행 방법.
- 제3항에 있어서,상기 인덱스 정보는 상기 랜덤 억세스를 수행하는 콤포넌트 반송파와 링크된 하향링크 콤포넌트 반송파의 인덱스를 포함하는 것을 특징으로 하는 핸드오버 수행 방법.
- 소스 기지국으로부터 시그너처 루트 시퀀스 인덱스, 순환 시프트 파라미터 및 타겟 셀의 콤포넌트 반송파 관련 정보를 포함하는 메시지를 수신하고, 타겟 기지국으로 랜덤 억세스 시그너처를 전송하는 RF(Radio Frequency) 모듈; 및상기 시그너처 루트 시퀀스 인덱스, 순환 시프트 파라미터 및 타겟 셀의 콤포넌트 반송파 관련 정보를 포함하는 메시지를 처리하고, 상기 시그너처 루트 시퀀스 인덱스 및 상기 순환 시프트 파라미터에 따라 상기 랜덤 억세스 시그너처를 준비하는 프로세서를 포함하고,상기 랜덤 억세스 시그너처는 상기 타겟 셀의 콤포넌트 반송파 관련 정보에 의해 확인된 콤포넌트 반송파를 통해 상기 타겟 기지국으로 전송되는 단말.
- 제5항에 있어서,상기 콤포넌트 반송파 관련 정보는 상기 타겟 셀에서 상기 단말에게 지정한 콤포넌트 반송파 할당 정보를 포함하는 것을 특징으로 하는 단말.
- 제6항에 있어서,상기 콤포넌트 반송파 할당 정보는 상기 랜덤 억세스를 수행하는 상향링크 콤포넌트 반송파와 관련된 인덱스 정보를 포함하는 것을 특징으로 하는 단말.
- 제7항에 있어서,상기 인덱스 정보는 상기 랜덤 억세스를 수행하는 콤포넌트 반송파와 링크된 하향링크 콤포넌트 반송파의 인덱스를 포함하는 것을 특징으로 하는 단말.
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US15/096,054 US10575223B2 (en) | 2009-03-13 | 2016-04-11 | Handover performed in consideration of uplink/downlink component carrier setup |
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WO2017142213A1 (ko) * | 2016-02-19 | 2017-08-24 | 삼성전자 주식회사 | 무선 통신 네트워크에서 핸드오버시 데이터 전송 중단 시간을 최소화하는 방법 및 장치 |
US10764799B2 (en) | 2016-02-19 | 2020-09-01 | Samsung Electronics Co., Ltd. | Method and apparatus for minimizing interruption time of data transfer on handover in wireless communication network |
US11432212B2 (en) | 2016-02-19 | 2022-08-30 | Samsung Electronics Co., Ltd. | Method and apparatus for minimizing interruption time of data transfer on handover in wireless communication network |
Also Published As
Publication number | Publication date |
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CN105099597A (zh) | 2015-11-25 |
CN102415155A (zh) | 2012-04-11 |
US20160227451A1 (en) | 2016-08-04 |
US9338705B2 (en) | 2016-05-10 |
US8811350B2 (en) | 2014-08-19 |
CN105099597B (zh) | 2018-02-02 |
KR101356525B1 (ko) | 2014-01-29 |
US10575223B2 (en) | 2020-02-25 |
US20120002643A1 (en) | 2012-01-05 |
WO2010104365A3 (ko) | 2010-11-25 |
US20150003416A1 (en) | 2015-01-01 |
CN102415155B (zh) | 2015-08-19 |
KR20110135863A (ko) | 2011-12-19 |
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