WO2018143656A1 - 시스템 정보를 요청하는 방법 및 장치 - Google Patents
시스템 정보를 요청하는 방법 및 장치 Download PDFInfo
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- WO2018143656A1 WO2018143656A1 PCT/KR2018/001308 KR2018001308W WO2018143656A1 WO 2018143656 A1 WO2018143656 A1 WO 2018143656A1 KR 2018001308 W KR2018001308 W KR 2018001308W WO 2018143656 A1 WO2018143656 A1 WO 2018143656A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
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- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
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- H04W—WIRELESS COMMUNICATION NETWORKS
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Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for a terminal to request other system information and an apparatus supporting the same.
- a 5G communication system or a pre-5G communication system is called a system after a 4G network (beyond 4G network) or after a long term evolution (LTE) system (post LTE).
- System information refers to essential information for communication between the terminal and the base station.
- system information is divided into MIB (Master Information Block) and SIB (System Information Block).
- MIB is the most essential information
- SIB is divided into SIB-x according to its importance or frequency.
- the MIB is transmitted through a physical broadcast channel (PBCH), which is a physical channel, and the SIB is transmitted through a PDCCH as common control information.
- PBCH physical broadcast channel
- the number of system information blocks continues to increase. Since the use of radio resources is required for broadcasting the system information blocks, as the number of system information blocks increases, the amount of radio resources required for broadcasting the system information blocks also increases. In transmitting continuously increasing system information to the terminal, a system information request method that efficiently utilizes radio resources needs to be proposed.
- a method for requesting system information by a terminal in a wireless communication system includes transmitting a random access preamble for a system information request to a base station; Receiving a random access response from the base station including only a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble; And deeming that the random access procedure is completed.
- RAPID random access preamble identifier
- a terminal for requesting system information in a wireless communication system includes a memory; Transceiver; And a processor connecting the memory and the transceiver, wherein the processor controls the transceiver to transmit a random access preamble for a system information request to a base station, and the transceiver corresponds to a RAPID corresponding to the transmitted random access preamble.
- a random access response including only a random access preamble identifier) may be controlled to be received from the base station, and it may be considered that the random access procedure is completed.
- the terminal can efficiently request other system information.
- FIG. 1 shows a structure of an LTE system.
- FIG. 2 shows an air interface protocol of an LTE system for a control plane.
- FIG 3 shows an air interface protocol of an LTE system for a user plane.
- MIB master information block
- SIB1 system information block
- SIB system information blocks
- FIG. 9 illustrates a procedure of requesting system information by a terminal in a random access procedure according to an embodiment of the present invention.
- FIG. 10 illustrates an example of a MAC subheader including only RAPID according to an embodiment of the present invention.
- FIG. 11 illustrates an example of a MAC PUD according to an embodiment of the present invention.
- FIG. 12 illustrates a method of requesting and receiving system information based on a new type of RAR window in a random access procedure according to an embodiment of the present invention.
- FIG. 13 illustrates an example in which requested system information is provided in a second RAR window according to an embodiment of the present invention.
- FIG. 14 is a block diagram illustrating a method for requesting system information by a terminal according to an embodiment of the present invention.
- 15 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
- 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
- CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
- GSM global system for mobile communications
- GPRS general packet radio service
- EDGE enhanced data rates for GSM evolution
- OFDMA may be implemented by wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
- IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
- UTRA is part of a universal mobile telecommunications system (UMTS).
- 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted.
- LTE-A (advanced) is the evolution of 3GPP LTE.
- 5G communication system is the evolution of LTE-A.
- FIG. 1 shows a structure of an LTE system.
- Communication networks are widely deployed to provide various communication services such as IMS and Voice over internet protocol (VoIP) over packet data.
- VoIP Voice over internet protocol
- an LTE system structure includes one or more UEs 10, an evolved-UMTS terrestrial radio access network (E-UTRAN), and an evolved packet core (EPC).
- the terminal 10 is a communication device moved by a user.
- 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), and a wireless device.
- MS mobile station
- UT user terminal
- SS subscriber station
- wireless device a wireless device.
- the E-UTRAN may include one or more evolved node-eB (eNB) 20, and a plurality of terminals may exist in one cell.
- the eNB 20 provides an end point of a control plane and a user plane to the terminal.
- the eNB 20 generally refers to a fixed station communicating with the terminal 10, and may be referred to in other terms such as a base station (BS), a base transceiver system (BTS), an access point, and the like.
- BS base station
- BTS base transceiver system
- One eNB 20 may be arranged per cell. There may be one or more cells within the coverage of the eNB 20.
- One cell may be configured to have one of bandwidths such as 1.25, 2.5, 5, 10, and 20 MHz to provide downlink (DL) or uplink (UL) transmission service to various terminals. In this case, different cells may be configured to provide different bandwidths.
- DL means communication from the eNB 20 to the terminal 10
- UL means communication from the terminal 10 to the eNB 20.
- the transmitter may be part of the eNB 20 and the receiver may be part of the terminal 10.
- the transmitter may be part of the terminal 10 and the receiver may be part of the eNB 20.
- the EPC may include a mobility management entity (MME) that serves as a control plane, and a system architecture evolution (SAE) gateway (S-GW) that serves as a user plane.
- MME mobility management entity
- SAE system architecture evolution gateway
- S-GW gateway
- the MME / S-GW 30 may be located at the end of the network and is connected to an external network.
- the MME has information about the access information of the terminal or the capability of the terminal, and this information may be mainly used for mobility management of the terminal.
- S-GW is a gateway having an E-UTRAN as an endpoint.
- the MME / S-GW 30 provides the terminal 10 with the endpoint of the session and the mobility management function.
- the EPC may further include a packet data network (PDN) -gateway (GW).
- PDN-GW is a gateway with PDN as an endpoint.
- the MME includes non-access stratum (NAS) signaling to the eNB 20, NAS signaling security, access stratum (AS) security control, inter CN (node network) signaling for mobility between 3GPP access networks, idle mode terminal reachability ( Control and execution of paging retransmission), tracking area list management (for terminals in idle mode and active mode), P-GW and S-GW selection, MME selection for handover with MME change, 2G or 3G 3GPP access Bearer management, including roaming, authentication, and dedicated bearer settings, SGSN (serving GPRS support node) for handover to the network, public warning system (ETWS) and commercial mobile alarm system (PWS) It provides various functions such as CMAS) and message transmission support.
- NAS non-access stratum
- AS access stratum
- inter CN node network
- MME selection for handover with MME change
- 2G or 3G 3GPP access Bearer management including roaming, authentication, and dedicated bearer settings
- SGSN serving GPRS support no
- S-GW hosts can be based on per-user packet filtering (eg, through deep packet inspection), legal blocking, terminal IP (Internet protocol) address assignment, transport level packing marking in DL, UL / DL service level charging, gating and It provides various functions of class enforcement, DL class enforcement based on APN-AMBR.
- MME / S-GW 30 is simply represented as a "gateway", which may include both MME and S-GW.
- An interface for user traffic transmission or control traffic transmission may be used.
- the terminal 10 and the eNB 20 may be connected by the Uu interface.
- the eNBs 20 may be interconnected by an X2 interface. Neighboring eNBs 20 may have a mesh network structure by the X2 interface.
- the eNBs 20 may be connected with the EPC by the S1 interface.
- the eNBs 20 may be connected to the EPC by the S1-MME interface and may be connected to the S-GW by the S1-U interface.
- the S1 interface supports a many-to-many-relation between eNB 20 and MME / S-GW 30.
- the eNB 20 may select for the gateway 30, routing to the gateway 30 during radio resource control (RRC) activation, scheduling and transmission of paging messages, scheduling channel information (BCH), and the like.
- RRC radio resource control
- BCH scheduling channel information
- the gateway 30 may perform paging initiation, LTE idle state management, user plane encryption, SAE bearer control, and encryption and integrity protection functions of NAS signaling in the EPC.
- FIG. 2 shows an air interface protocol of an LTE system for a control plane.
- 3 shows an air interface protocol of an LTE system for a user plane.
- the layer of the air interface protocol between the UE and the E-UTRAN is based on the lower three layers of the open system interconnection (OSI) model, which is well known in communication systems, and includes L1 (first layer), L2 (second layer), and L3 (third layer). Hierarchical).
- the air interface protocol between the UE and the E-UTRAN may be horizontally divided into a physical layer, a data link layer, and a network layer, and vertically a protocol stack for transmitting control signals.
- Layers of the radio interface protocol may exist in pairs in the UE and the E-UTRAN, which may be responsible for data transmission of the Uu interface.
- the physical layer belongs to L1.
- the physical layer provides an information transmission service to a higher layer through a physical channel.
- the physical layer is connected to a higher layer of a media access control (MAC) layer through a transport channel.
- Physical channels are mapped to transport channels.
- Data may be transmitted between the MAC layer and the physical layer through a transport channel.
- Data between different physical layers, that is, between the physical layer of the transmitter and the physical layer of the receiver may be transmitted using radio resources through a physical channel.
- the physical layer may be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and utilizes time and frequency as radio resources.
- OFDM orthogonal frequency division multiplexing
- the physical layer uses several physical control channels.
- a physical downlink control channel (PDCCH) reports resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH), and hybrid automatic repeat request (HARQ) information related to the DL-SCH to the UE.
- the PDCCH may carry an uplink grant to report to the UE regarding resource allocation of uplink transmission.
- the physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for the PDCCH and is transmitted every subframe.
- a physical hybrid ARQ indicator channel (PHICH) carries a HARQ ACK (non-acknowledgement) / NACK (non-acknowledgement) signal for UL-SCH transmission.
- a physical uplink control channel (PUCCH) carries UL control information such as HARQ ACK / NACK, a scheduling request, and a CQI for downlink transmission.
- the physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH).
- the physical channel includes a plurality of subframes in the time domain and a plurality of subcarriers in the frequency domain.
- One subframe consists of a plurality of symbols in the time domain.
- One subframe consists of a plurality of resource blocks (RBs).
- One resource block is composed of a plurality of symbols and a plurality of subcarriers.
- each subframe may use specific subcarriers of specific symbols of the corresponding subframe for the PDCCH.
- the first symbol of the subframe may be used for the PDCCH.
- the PDCCH may carry dynamically allocated resources, such as a physical resource block (PRB) and modulation and coding schemes (MCS).
- a transmission time interval (TTI) which is a unit time at which data is transmitted, may be equal to the length of one subframe.
- One subframe may have a length of 1 ms.
- a DL transport channel for transmitting data from a network to a UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a DL-SCH for transmitting user traffic or control signals. And the like.
- BCH broadcast channel
- PCH paging channel
- DL-SCH supports dynamic link adaptation and dynamic / semi-static resource allocation by varying HARQ, modulation, coding and transmit power.
- the DL-SCH may enable the use of broadcast and beamforming throughout the cell.
- System information carries one or more system information blocks. All system information blocks can be transmitted in the same period. Traffic or control signals of a multimedia broadcast / multicast service (MBMS) are transmitted through a multicast channel (MCH).
- MCH multicast channel
- the UL transport channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message, a UL-SCH for transmitting user traffic or a control signal, and the like.
- the UL-SCH can support dynamic link adaptation due to HARQ and transmit power and potential changes in modulation and coding.
- the UL-SCH may enable the use of beamforming.
- RACH is generally used for initial connection to a cell.
- the MAC layer belonging to 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 MAC layer provides a mapping function from a plurality of logical channels to a plurality of transport channels.
- the MAC layer also provides a logical channel multiplexing function by mapping from multiple logical channels to a single transport channel.
- the MAC sublayer provides data transfer services on logical channels.
- the logical channel may be divided into a control channel for information transmission in the control plane and a traffic channel for information transmission in the user plane according to the type of information to be transmitted. That is, a set of logical channel types is defined for other data transfer services provided by the MAC layer.
- the logical channel is located above the transport channel and mapped to the transport channel.
- the control channel is used only for conveying information in the control plane.
- the control channel provided by the MAC layer includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a dedicated control channel (DCCH).
- BCCH is a downlink channel for broadcasting system control information.
- PCCH is a downlink channel used for transmitting paging information and paging a terminal whose cell-level location is not known to the network.
- CCCH is used by the terminal when there is no RRC connection with the network.
- MCCH is a one-to-many downlink channel used to transmit MBMS control information from the network to the terminal.
- DCCH is a one-to-one bidirectional channel used by the terminal for transmitting dedicated control information between the terminal and the network in an RRC connection state.
- the traffic channel is used only for conveying information in the user plane.
- the traffic channel provided by the MAC layer includes a dedicated traffic channel (DTCH) and a multicast traffic channel (MTCH).
- DTCH is used for transmission of user information of one UE in a one-to-one channel and may exist in both uplink and downlink.
- MTCH is a one-to-many downlink channel for transmitting traffic data from the network to the terminal.
- the uplink connection between the logical channel and the transport channel includes a DCCH that can be mapped to the UL-SCH, a DTCH that can be mapped to the UL-SCH, and a CCCH that can be mapped to the UL-SCH.
- the downlink connection between the logical channel and the transport channel is a BCCH that can be mapped to a BCH or DL-SCH, a PCCH that can be mapped to a PCH, a DCCH that can be mapped to a DL-SCH, a DTCH that can be mapped to a DL-SCH, MCCH that can be mapped to MCH and MTCH that can be mapped to MCH.
- the RLC layer belongs to L2.
- the function of the RLC layer includes adjusting the size of the data by segmentation / concatenation of the data received from the upper layer in the radio section such that the lower layer is suitable for transmitting data.
- the RLC layer is divided into three modes: transparent mode (TM), unacknowledged mode (UM) and acknowledged mode (AM). Provides three modes of operation.
- TM transparent mode
- UM unacknowledged mode
- AM acknowledged mode
- AM RLC provides retransmission through automatic repeat request (ARQ) for reliable data transmission.
- ARQ automatic repeat request
- the function of the RLC layer may be implemented as a functional block inside the MAC layer, in which case the RLC layer may not exist.
- the packet data convergence protocol (PDCP) layer belongs to L2.
- the PDCP layer introduces an IP packet, such as IPv4 or IPv6, over a relatively low bandwidth air interface to provide header compression that reduces unnecessary control information so that the transmitted data is transmitted efficiently. Header compression improves transmission efficiency in the wireless section by transmitting only the information necessary for the header of the data.
- the PDCP layer provides security. Security functions include encryption to prevent third party inspection and integrity protection to prevent third party data manipulation.
- the radio resource control (RRC) layer belongs to L3.
- the RRC layer at the bottom of L3 is defined only in the control plane.
- the RRC layer serves to control radio resources between the terminal and the network.
- the UE and the network exchange RRC messages through the RRC layer.
- the RRC layer is responsible for the control of logical channels, transport channels and physical channels in connection with the configuration, re-configuration and release of RBs.
- RB is a logical path provided by L1 and L2 for data transmission between the terminal and the network. That is, RB means a service provided by L2 for data transmission between the UE and the E-UTRAN. Setting up an RB means defining the characteristics of the radio protocol layer and channel to provide a particular service, and determining each specific parameter and method of operation.
- RBs may be classified into two types: signaling RBs (SRBs) and data RBs (DRBs).
- SRBs signaling RBs
- DRBs data RBs
- the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
- the RLC and MAC layers may perform functions such as scheduling, ARQ and HARQ.
- the RRC layer (ended at the eNB at the network side) may perform functions such as broadcast, paging, RRC connection management, RB control, mobility function, and UE measurement report / control.
- the NAS control protocol (terminated at the gateway's MME at the network side) may perform functions such as SAE bearer management, authentication, LTE_IDLE mobility handling, paging initiation at LTE_IDLE, and security control for signaling between the terminal and the gateway.
- the RLC and MAC layer may perform the same function as the function in the control plane.
- the PDCP layer may perform user plane functions such as header compression, integrity protection and encryption.
- MIB master information block
- SIB1 system information block
- SIB system information blocks
- the LTE cell broadcasts the basic parameters necessary for the operation of the IDLE_MODE terminal and the CONNECTED_MODE terminal into a plurality of information blocks.
- information blocks include MIBs, SIB1, SIB2, and other System Information Blocks (SIBn).
- the MIB includes the most basic parameters necessary for the terminal to access the cell.
- the MIB message is broadcasted through the BCH at a period of 40 ms, and the MIB transmission is repeated in all radio frames within the 40 ms period.
- the terminal receives the SIB message using the parameter received from the MIB.
- SIBs There are several types of SIBs.
- SIB1 includes information related to cell access, and in particular, includes scheduling information of other SIBs SIB2 to SIBn except SIB1.
- SIBs having the same transmission period among other SIs except SIB1 are included in the same system information (SI) message and transmitted. Therefore, the scheduling information includes a mapping relationship between each SIB and SI message.
- the SI message is transmitted in a window of the time domain (SI-window), and each SI message is associated with one SI-window. Since SI-windows of different SIs do not overlap, only one SI message is transmitted in any SI-window. Therefore, the scheduling information includes the length of the SI-window and the SI transmission period.
- the time / frequency at which the SI message is transmitted is determined by the dynamic scheduling of the base station.
- SIB1 is broadcast on a downlink common channel (DL-SCH) in eight radio frame periods (ie, 80 ms periods), and SIB1 is repeatedly retransmitted on subframe 5 of a radio frame of SFN mod 2 within an 80 ms period.
- DL-SCH downlink common channel
- SIB2 includes information necessary for the terminal to access the cell. This includes information about uplink cell bandwidth, random access parameters, parameters related to uplink power control, and the like.
- SIB3 includes cell reselection information.
- SIB4 includes frequency information of a serving cell and intra frequency information of a neighbor cell related to cell reselection.
- SIB5 includes information on another E-UTRA frequency and information on inter frequencies of neighboring cells related to cell reselection.
- SIB6 includes information on UTRA frequency and information on UTRA neighbor cells related to cell reselection.
- SIB7 includes information on GERAN frequencies related to cell reselection.
- SIB8 includes information about a neighbor cell.
- SIB9 includes an ID of a Home eNodeB (HeNB).
- SIB10 to SIB12 include public warning messages, for example earthquake warnings.
- SIB14 is used to support enhanced access barring and controls terminals accessing a cell.
- SIB15 includes information required for MBMS reception of an adjacent carrier frequency.
- SIB16 includes GPS time and Coordinated Universal Time (UTC) related information.
- SIB17 includes RAN assistance information.
- SIB9 is not needed in the mode in which the HeNB is constructed by the operator, and SIB13 is not necessary unless the MBMS is provided in the cell.
- System information is commonly applied to all terminals connected in a cell, and the terminal must always maintain the latest system information for proper operation. If the system information is changed, the UE should know in advance when the base station transmits the new system information.
- 3GPP TS 36.331 v9.3.0 has introduced the concept of a BCCH modification period in order for the base station and the terminal to mutually recognize a radio frame period in which new system information can be transmitted. It demonstrates concretely below.
- the base station if the base station intends to update the system information in the n + 1th change interval, the base station notifies the terminals of the update of the system information in advance during the nth change interval.
- the terminal notified of the update of the system information in the nth change interval section receives and applies new system information as soon as the n + 1th change interval starts.
- the base station If an update of the system information is scheduled, the base station includes the system information modification indicator in the paging message.
- the paging message is a message received by the idle mode terminal, but because the notification of the update of the system information through the paging message, the connected mode terminal should also receive the paging message from time to time to check whether the system information is updated.
- Random access is used for the terminal to obtain uplink synchronization with the base station or receive uplink radio resources.
- the terminal acquires downlink synchronization with the initial cell and receives system information. From the system information, a set of available random access preambles and information about radio resources used for transmission of the random access preambles are obtained.
- the radio resource used for transmission of the random access preamble may be specified as a combination of a radio frame and / or at least one or more subframes.
- the terminal transmits a random access preamble randomly selected from the set of random access preambles, and the base station receiving the random access preamble sends a TA (timing alignment) value for uplink synchronization to the terminal through a random access response. As a result, the terminal acquires uplink synchronization.
- TA timing alignment
- the base station allocates a designated random access preamble to a specific terminal, and the terminal performs non-contention random access with the corresponding random access preamble. That is, in the process of selecting a random access preamble, a contention-based random access using a randomly selected one by a terminal within a specific set and a non-competitive random access using a random access preamble allocated by a base station only to a specific terminal There can be.
- Non-competitive random access may be used when requested by a procedure for handover or a command of a base station.
- the terminal randomly selects one random access preamble from a set of random access preambles indicated by system information or a handover command.
- a radio resource capable of transmitting the random access preamble is selected to transmit the selected random access preamble.
- the radio resource may be a specific subframe, which may be to select a physical random access channel (PRACH).
- PRACH physical random access channel
- the terminal After the random access preamble transmission, the terminal attempts to receive a random access response in the random access response receiving window indicated by the system information or the handover command, and accordingly receives a random access response (S620).
- the random access response is transmitted in a MAC PDU format, and the MAC PDU may be transmitted in a physical downlink shared channel (PDSCH).
- the physical downlink control channel (PDCCH) is also delivered in order for the terminal to properly receive the information delivered to the PDSCH. That is, the PDCCH includes information of a terminal receiving the PDSCH, frequency and time information of radio resources of the PDSCH, a transmission format of the PDSCH, and the like.
- the random access response may include a random access preamble identifier (ID), an UL grant (uplink radio resource), a temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier), and a time alignment command (TAC). Since one random access response may include random access response information for one or more terminals, a random access preamble identifier may be included to indicate to which terminal the included UL Grant, temporary C-RNTI, and TAC are valid.
- the random access preamble identifier may be an identifier for the random access preamble received by the base station.
- the TAC may be included as information for the UE to adjust uplink synchronization.
- the random access response may be indicated by a random access identifier on the PDCCH, that is, a random access-radio network temporary identifier (RA-RNTI).
- RA-RNTI random access-radio network temporary identifier
- the terminal When receiving the random access response valid to the terminal, the terminal processes the information included in the random access response, and performs the scheduled transmission to the base station (S630). That is, the terminal applies the TAC and stores the temporary C-RNTI. In addition, by using the UL Grant, data or newly generated data stored in the buffer of the terminal is transmitted to the base station. In this case, information that can identify the terminal should be included. This is because, in the contention-based random access procedure, the base station cannot determine which terminals perform random access, and thus it is necessary to identify the terminal in order to resolve the collision.
- the terminal There are two methods for including the information identifying the terminal. If the UE already has a valid cell identifier assigned in the cell before performing random access, the UE transmits its cell identifier through the UL Grant. On the other hand, if a valid cell identifier has not been allocated before the random access procedure, the terminal transmits its own unique identifier (eg, S-TMSI or Random ID). In general, the unique identifier is longer than the cell identifier. If the terminal transmits data through the UL Grant, it initiates a timer (contention resolution timer) for conflict resolution.
- a timer contention resolution timer
- the terminal After receiving the random access response, the terminal transmits data including its identifier through the allocated UL Grant, and waits for an instruction of the base station to resolve the collision (S640). That is, it attempts to receive a PDCCH to receive a specific message.
- Two methods may be proposed as a method of receiving a PDCCH.
- its identifier transmitted through the UL Grant is a cell identifier
- it may attempt to receive the PDCCH using its cell identifier. In this case, if the PDCCH is received through its cell identifier before the conflict resolution timer expires, the UE determines that the random access has been normally performed and terminates the random access.
- the terminal may determine that the random access is normally performed and may terminate the random access.
- contention-free random access may be terminated by the terminal receiving a random access response.
- Non-competition based random access may be initiated by request, such as handover and / or command of a base station. However, in the above two cases, contention based random access may also be performed.
- the terminal is assigned a designated random access preamble with no possibility of collision from the base station.
- the allocation of the random access preamble may be performed through the handover command and the PDCCH command (S710).
- the UE After receiving the random access preamble designated for the UE, the UE transmits the corresponding random access preamble to the base station (S720).
- the base station When the base station receives the random access preamble, the base station transmits a random access response to the terminal in response (S730).
- the procedure related to the random access response may refer to S620 of FIG. 6 described above.
- the new type of system information may be divided into minimum system information and other system information.
- the minimum system information may be broadcast periodically.
- the minimum system information may include basic information necessary for initial access to the cell and information for obtaining other system information that is provisioned or periodically broadcast on an on-demand basis.
- the minimum system information may include at least one of a SFN, a list of PLMNs, a cell ID, a cell camping parameter, and a RACH parameter. If the network allows an on-demand mechanism, the parameters needed to request other system information may be included in the minimum system information.
- the other system information may mean all system information that is not broadcast in the minimum system information.
- the terminal may request transmission of system information from the network in order to acquire other system information. For example, if the network does not broadcast specific system information, the UE in the RRC_IDLE state may request specific system information from the network using the RACH procedure.
- the terminal requests specific system information to the network using the RACH procedure, the first message may be used to transmit the system information request, and the requested system information may be broadcast.
- the first message is used for requesting system information, it may be unnecessary for the terminal to transmit the third message to the network.
- the uplink grant for the third message also need not be included in the second message because the terminal does not need to transmit the third message to the network.
- a random access procedure for requesting system information may be referred to as a system information request procedure.
- a message transmitted first in a random access procedure may be referred to as a first message or MSG1
- a second transmitted message may be referred to as a second message or MSG2
- a third transmitted message may be referred to as a first message.
- the third message may be referred to as MSG3, and the fourth transmitted message may be referred to as a fourth message or MSG4.
- FIG. 9 illustrates a procedure of requesting system information by a terminal in a random access procedure according to an embodiment of the present invention.
- the terminal may transmit a first message to the base station.
- the first message may be a random access preamble.
- the random access preamble may be used for system information request.
- the first message may be transmitted using a first message resource reserved for a system information request. For example, if the terminal wants to receive other system information, the terminal selects a first message resource corresponding to the other system information of interest, and transmits the system information using the selected first message resource.
- the requesting first message may be transmitted.
- the terminal may be in an RRC_IDLE state or an RRC_INACTIVE state.
- the terminal may receive a second message from the base station including a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble. That is, the terminal may receive a second message including a first resource identifier matched with the transmitted first message resource from the base station.
- the second message may be a random access response or a system information request response.
- the second message may only contain RAPID.
- the base station may transmit a second message including only the RAPID corresponding to the transmitted random access preamble to the terminal.
- the second message may include only the RAPID corresponding to the random access preamble transmitted for the system information request in step S910, but may not include the MAC Medium Access Control Random Access Response (RAR). That is, the second message may not include an uplink grant mapped to the random access preamble transmitted for the system information request in step S910.
- RAR Medium Access Control Random Access Response
- the MAC RAR may not be included in the MAC subPDU.
- FIG. 10 illustrates an example of a MAC subheader including only RAPID according to an embodiment of the present invention.
- step S930 when the terminal receives a second message including only RAPID (ie, does not include MAC RAR or uplink grant), the terminal may perform a random access procedure for requesting system information. It can be determined that it is completed. Therefore, the terminal may terminate the random access procedure for the system information request. Therefore, the terminal may not transmit the third message to the base station. And, the terminal can expect that the requested system information will be broadcast. Additionally, the terminal may instruct the upper layer to receive the ACK for the system information request.
- RAPID ie, does not include MAC RAR or uplink grant
- the terminal may confirm when the requested system information is to be broadcast, and may receive the requested system information.
- the requested system information may be received in a broadcast manner.
- the terminal may receive a second message including a MAC RAR corresponding to the transmitted random access preamble. Accordingly, the terminal receiving the second message including the uplink grant may proceed with a random access procedure of four steps and may enter the RRC_CONNECTED state. That is, the terminal may transmit the third message to the base station, receive the fourth message from the base station, and enter the RRC_CIONNECTED state. Thereafter, the terminal may receive the requested system information in a dedicated manner.
- the base station when the terminal transmits a random access preamble for the system information request to the base station, the base station may transmit a random access response including only the RAPID corresponding to the transmitted random access preamble to the terminal.
- the terminal receiving the request may regard the random access procedure for the system information request to be completed. Therefore, it is possible to solve a problem such as radio resource waste or battery consumption that may occur when the terminal unnecessarily transmits the third message to the base station.
- FIG. 11 illustrates an example of a MAC PUD according to an embodiment of the present invention.
- a MAC PDU may include a MAC PDU header and zero or more MAC RARs.
- One MAC PDU header may consist of one or more MAC PDU subheaders.
- the corresponding MAC RAR may or may not be included in the MAC PDU.
- the first MAC subheader containing the RAPID may be mapped to the first MAC RAR.
- the second MAC subheader containing the RAPID may be mapped to the second MAC RAR.
- the MAC subheader including RAPID 2 may be mapped to the first MAC RAR including the uplink grant, and the MAC subheader including RAPID 4 may be mapped to the second MAC RAR including the uplink grant. have.
- the terminal may proceed with a random access procedure of four steps. That is, since the terminal receives the random access response including the uplink grant in response to the random access preamble, the terminal that has received the second message may then transmit the third message and receive the fourth message.
- the terminal may consider the system information request to be successful. Thus, the third message may not be sent to complete the random access procedure. Since the terminal receives a random access response that does not include an uplink grant in response to the random access preamble, the terminal may complete the random access procedure without transmitting the third message.
- a new indicator including a RAPID may be included in the MAC subheader to indicate whether the MAC RAR is included in the MAC PDU.
- the network receiving the first message may need to determine whether to broadcast or unicast the system information requested by the terminal, which may require more time.
- the existing RAR may not be suitable. Therefore, a new type of RAR window needs to be proposed.
- the first RAR window may be a RAR window used when the first message is transmitted for general RACH purposes
- the second RAR window may be a RAR window used when the first message is transmitted for the purpose of requesting system information. have.
- the second message may be received within the first RAR window.
- the first message is sent for a general RACH purpose rather than for a system information request
- the second message may be received within the second RAR window.
- the terminal may apply the setting for the second RAR window to receive the second message from the network. Otherwise, the terminal can apply the setting for the first RAR window to receive the second message from the network.
- FIG. 12 illustrates a method of requesting and receiving system information based on a new type of RAR window in a random access procedure according to an embodiment of the present invention.
- FIG. 12A illustrates an example in which the first message is transmitted for the purpose of a general RACH
- FIGS. 12B and 12C illustrate an example in which the first message is transmitted for the purpose of requesting system information. Indicates.
- the UE may initiate a RACH procedure for establishing an RRC connection.
- the terminal may select the first message resource and transmit the first message using the selected first message resource.
- the first message may be a random access preamble.
- the selected first message resource is not a resource associated with a system information request. Thus, the terminal can expect that the second message will be received within the first RAR window.
- the second message may be a random access response.
- the terminal may receive a second message within the first RAR window.
- the second message may be received according to the first RAR configuration.
- the terminal may transmit a third message to the network.
- the third message may include a UE ID.
- the terminal may receive a fourth message from the network.
- the fourth message may be an RRC connection setup message. Thereafter, the terminal may enter the RRC_CONNECTED state.
- step S1211 if the terminal wants to receive other system information, the terminal may select a first message resource corresponding to the other system information of interest.
- the terminal may transmit a first message for requesting transmission of system information by using the selected first message resource.
- the first message may be a random access preamble.
- the selected first message resource is a resource associated with a system information request.
- the second message may be a random access response or a system information request response.
- the network may determine whether to broadcast the requested system information or transmit unicast. In FIG. 12B, it is assumed that the network decides to broadcast the requested system information.
- the terminal may receive a second message including a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble within the second RAR window.
- the second message may be received according to a second RAR configuration.
- the second RAR configuration may be broadcast periodically along with the first RAR configuration.
- the terminal may determine that system information has been successfully requested. Otherwise, the terminal considers that the system information request has failed and may retransmit the first message for the system information request.
- the second message may not include an uplink grant or MAC RAR mapped to the transmitted random access preamble.
- the terminal may consider that the RACH procedure or system information request procedure for the system information request is completed.
- the terminal may stop or complete the RACH procedure or the system information request procedure for the system information request.
- the terminal can expect that the requested requested system information will be broadcast.
- the terminal may check when the requested system information is broadcast. In addition, the terminal may receive the requested system information in a broadcast manner.
- step S1221 if the terminal wants to receive other system information, the terminal may select a first message resource corresponding to the other system information of interest.
- the terminal may transmit a first message for requesting transmission of system information by using the selected first message resource.
- the first message may be a random access preamble.
- the selected first message resource is a resource associated with a system information request.
- the second message may be a random access response or a system information request response.
- the network may determine whether to broadcast the requested system information or transmit unicast. In (c) of FIG. 12, it is assumed that the network decides to unicast transmission of the requested system information.
- the UE may receive a second message in the second RAR window that includes a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble.
- the second message may be received according to a second RAR configuration.
- the second RAR configuration may be broadcast periodically along with the first RAR configuration.
- the second message may include an uplink grant or MAC RAR mapped to the transmitted random access preamble.
- the terminal may continue the RACH procedure or the system information request procedure for the system information request.
- the terminal may expect that the requested requested system information will be unicast transmitted, and may proceed with the four step RACH procedure to receive the requested system information in a dedicated manner.
- the terminal may transmit a third message to the network.
- the third message may include a UE ID.
- the terminal may receive a fourth message from the network.
- the fourth message may be an RRC connection setup message.
- the terminal may enter the RRC_CONNECTED state, and may receive the requested system information through dedicated signaling.
- FIG. 13 illustrates an example in which requested system information is provided in a second RAR window according to an embodiment of the present invention.
- the terminal when the terminal transmits the first message within the N-th second RAR window, the terminal may expect that the second message will be transmitted within the N + 1 th second RAR window.
- the setting for the second RAR window may be broadcast periodically.
- the network determines to broadcast the requested system information block within an N + 1 th second RAR window. Can be. In this case, the MAC RAR corresponding to the MAC subheader may not exist.
- the network may determine to broadcast the requested system information block in the N + 1th second RAR window. Or, the network may determine to unicast the requested system information block within the N + 1 th second RAR window. In this case, there may be a MAC RAR including an uplink grant corresponding to the MAC subheader.
- FIG. 14 is a block diagram illustrating a method for requesting system information by a terminal according to an embodiment of the present invention.
- the terminal may transmit a random access preamble for the system information request to the base station.
- the terminal may receive a random access response including only a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble from the base station.
- the random access response may not include a MAC RAR corresponding to the RAPID.
- the random access response may not include an uplink grant corresponding to the RAPID.
- the random access response including only the RAPID may be an ACK for the system information request.
- the random access response may be received from the base station using a MAC PDU.
- the random access response may be received in a newly defined RAR window to receive a random access response in response to a random access preamble for the system information request.
- the terminal may consider that the random access procedure is completed. If the terminal receives a random access response including only RAPID, the random access procedure may be considered complete.
- a third message may not be transmitted to the base station in response to the random access response.
- the terminal may transmit the reception of the ACK for the system information request to the upper layer.
- the terminal may check whether the requested system information is broadcast. And, the terminal can receive the requested system information.
- 15 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
- the base station 1500 includes a processor 1501, a memory 1502, and a transceiver 1503.
- the memory 1502 is connected to the processor 1501 and stores various information for driving the processor 1501.
- the transceiver 1503 is connected to the processor 1501 to transmit and / or receive a radio signal.
- Processor 1501 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 1501.
- the terminal 1510 includes a processor 1511, a memory 1512, and a transceiver 1513.
- the memory 1512 is connected to the processor 1511 and stores various information for driving the processor 1511.
- the transceiver 1513 is coupled to the processor 1511 to transmit and / or receive wireless signals.
- Processor 1511 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the terminal may be implemented by the processor 1511.
- 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 transceiver may include baseband circuitry for processing wireless signals.
- the above 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.
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Abstract
Description
Claims (15)
- 무선 통신 시스템에서 단말이 시스템 정보를 요청하는 방법에 있어서,시스템 정보 요청을 위한 랜덤 액세스 프리앰블을 기지국에게 전송하는 단계;상기 전송된 랜덤 액세스 프리앰블에 대응하는 RAPID(random access preamble identifier)만을 포함하는 랜덤 액세스 응답을 상기 기지국으로부터 수신하는 단계; 및랜덤 액세스 절차가 완료되었다고 간주하는 단계;를 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 단말이 오직 RAPID만을 포함하는 랜덤 액세스 응답을 수신하면, 상기 랜덤 액세스 절차는 완료된 것으로 간주되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 랜덤 액세스 응답은 상기 RAPID에 대응하는 MAC RAR을 포함하지 않는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 랜덤 액세스 응답은 상기 RAPID에 대응하는 상향링크 그랜트를 포함하지 않는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 랜덤 액세스 절차에서, 제 3 메시지는 상기 랜덤 액세스 응답에 대한 응답으로 상기 기지국에게 전송되지 않는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 시스템 정보 요청에 대한 ACK의 수신을 상위 계층에게 전송하는 단계;를 더 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 오직 RAPID만을 포함하는 랜덤 액세스 응답은 상기 시스템 정보 요청에 대한 ACK인 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 랜덤 액세스 응답은 MAC PDU를 이용하여 상기 기지국으로부터 수신되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 랜덤 액세스 응답은 상기 시스템 정보 요청을 위한 랜덤 액세스 프리앰블에 대응하여 랜덤 액세스 응답을 수신하기 위해 새롭게 정의된 RAR 윈도우에서 수신되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 요청된 시스템 정보가 방송되는지 확인하는 단계;를 더 포함하는 것을 특징으로 하는 방법.
- 제 10 항에 있어서,상기 요청된 시스템 정보를 수신하는 단계;를 더 포함하는 것을 특징으로 하는 방법.
- 무선 통신 시스템에서 시스템 정보를 요청하는 단말에 있어서,메모리; 송수신기; 및 상기 메모리와 상기 송수신기를 연결하는 프로세서를 포함하되, 상기 프로세서는상기 송수신기가 시스템 정보 요청을 위한 랜덤 액세스 프리앰블을 기지국에게 전송하도록 제어하고,상기 송수신기가 상기 전송된 랜덤 액세스 프리앰블에 대응하는 RAPID(random access preamble identifier)만을 포함하는 랜덤 액세스 응답을 상기 기지국으로부터 수신하도록 제어하고, 및랜덤 액세스 절차가 완료되었다고 간주하는 것을 특징으로 하는 단말.
- 제 12 항에 있어서,상기 단말이 오직 RAPID만을 포함하는 랜덤 액세스 응답을 수신하면, 상기 랜덤 액세스 절차는 완료된 것으로 간주되는 것을 특징으로 하는 단말.
- 제 12 항에 있어서,상기 랜덤 액세스 응답은 상기 RAPID에 대응하는 MAC RAR을 포함하지 않는 것을 특징으로 하는 단말.
- 제 12 항에 있어서,상기 랜덤 액세스 응답은 상기 RAPID에 대응하는 상향링크 그랜트를 포함하지 않는 것을 특징으로 하는 단말.
Priority Applications (23)
Application Number | Priority Date | Filing Date | Title |
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ES18748303T ES2867395T3 (es) | 2017-02-01 | 2018-01-31 | Método y dispositivo para solicitar información de sistema |
EP18748303.7A EP3579653B1 (en) | 2017-02-01 | 2018-01-31 | Method and device for requesting system information |
KR1020207002047A KR102111727B1 (ko) | 2017-02-01 | 2018-01-31 | 시스템 정보를 요청하는 방법 및 장치 |
CN201880009456.0A CN110249699B (zh) | 2017-02-01 | 2018-01-31 | 用于请求系统信息的方法和装置 |
CA3043457A CA3043457C (en) | 2017-02-01 | 2018-01-31 | Method and device for requesting system information |
EP21157660.8A EP3843494B1 (en) | 2017-02-01 | 2018-01-31 | Method and device for transmitting system information |
KR1020207007868A KR102145303B1 (ko) | 2017-02-01 | 2018-01-31 | 시스템 정보를 요청하는 방법 및 장치 |
EP21217174.8A EP4002952B1 (en) | 2017-02-01 | 2018-01-31 | Method and device for requesting system information |
MX2019007696A MX2019007696A (es) | 2017-02-01 | 2018-01-31 | Metodo y dispositivo para solicitar informacion del sistema. |
DE112018000008.7T DE112018000008T5 (de) | 2017-02-01 | 2018-01-31 | Verfahren und Vorrichtung zum Anfordern von Systeminformation |
RU2019107935A RU2731497C1 (ru) | 2017-02-01 | 2018-01-31 | Способ и устройство для запроса системной информации |
KR1020187017566A KR102070877B1 (ko) | 2017-02-01 | 2018-01-31 | 시스템 정보를 요청하는 방법 및 장치 |
US16/064,968 US10834752B2 (en) | 2017-02-01 | 2018-01-31 | Method and apparatus for requesting system information |
JP2019510601A JP6691267B2 (ja) | 2017-02-01 | 2018-01-31 | システム情報を要求する方法及び装置 |
BR112019007229-2A BR112019007229B1 (pt) | 2017-02-01 | 2018-01-31 | Método e dispositivo para solicitar informações de sistema |
SG11201901036QA SG11201901036QA (en) | 2017-02-01 | 2018-01-31 | Method and device for requesting system information |
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