WO2012015206A2 - Procédé pour propager un accès aléatoire, procédé pour propager et réaliser un accès aléatoire et dispositif associé - Google Patents

Procédé pour propager un accès aléatoire, procédé pour propager et réaliser un accès aléatoire et dispositif associé Download PDF

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Publication number
WO2012015206A2
WO2012015206A2 PCT/KR2011/005476 KR2011005476W WO2012015206A2 WO 2012015206 A2 WO2012015206 A2 WO 2012015206A2 KR 2011005476 W KR2011005476 W KR 2011005476W WO 2012015206 A2 WO2012015206 A2 WO 2012015206A2
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WIPO (PCT)
Prior art keywords
random access
terminal
base station
terminal group
paging
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PCT/KR2011/005476
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English (en)
Korean (ko)
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WO2012015206A3 (fr
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조희정
육영수
이은종
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LG Electronics Inc
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LG Electronics Inc
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Priority to US13/812,083 priority Critical patent/US9408236B2/en
Priority claimed from KR1020110073768A external-priority patent/KR20120025392A/ko
Publication of WO2012015206A2 publication Critical patent/WO2012015206A2/fr
Publication of WO2012015206A3 publication Critical patent/WO2012015206A3/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method for distributing random access, a method for distributing random access, and an apparatus therefor.
  • the broadband wireless communication system is based on Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), and transmits a physical channel signal using a plurality of subcarriers. High speed data transmission is possible.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the downlink data type transmitted by the base station to the terminal can be largely divided into a multicasting / broadcasting data type and a unicast type.
  • the multicasting / broadcasting data type may be used by the base station to transmit information, such as system information, configuration information, software upgrade information, to one or more group (s) to which the unspecified / specific terminals belong.
  • the unicast data type may be used by the base station to transmit request information to a specific terminal or to transmit a message including information (for example, configuration information) to be transmitted only to a specific terminal.
  • the terminal transmits to the base station or another terminal.
  • the terminal may finally transmit a message including information for delivery to another terminal or server to the base station.
  • Machine to Machine literally means communication between an electronic device and an electronic device. Broadly, it means wired or wireless communication between electronic devices, or communication between a device controlled by a person and a machine.
  • a general term refers to wireless communication between an electronic device and an electronic device, that is, between devices.
  • M2M communication In the early 1990s, when the concept of M2M communication was first introduced, it was recognized as a concept of remote control or telematics, and the market itself was very limited.However, in the last few years, M2M communication has grown rapidly and attracted attention not only in Korea but also worldwide. Growing into the receiving market. In particular, intelligent metering that measures logistics management, remote monitoring of machinery and equipment, operating hours on construction machinery, and automatic measurement of heat or electricity usage in point of sales (POS) and security-related applications. It showed great influence in the field of (Smart Meter). M2M communication in the future will be utilized for more various purposes in connection with existing mobile communication and wireless high speed internet or small output communication solutions such as Wi-Fi and Zigbee, and it will no longer be limited to the B2B market. Will be.
  • M2M communication era data can be sent and received to and from any machine equipped with a SIM card for remote management and control.
  • M2M communication technology can be used in numerous devices and equipment such as automobiles, trucks, trains, containers, vending machines, gas tanks, and the like.
  • M2M devices As the application types of M2M devices continue to increase, there will be numerous such M2M devices in the same base station.
  • M2M UEs which are kept in the idle state, increased innumerably, attempt random access, many collisions occur and communication performance is deteriorated. This problem may affect not only M2M terminals but also existing terminals (Human Type Communication, HTC).
  • An object of the present invention is to provide a method for distributing random access of a terminal by a base station in a wireless communication system.
  • Another object of the present invention is to provide a method for a terminal to perform random access in a wireless communication system.
  • Another object of the present invention is to provide a base station apparatus for distributing random access of a terminal in a wireless communication system.
  • Another object of the present invention is to provide a terminal device for performing random access in a wireless communication system.
  • a method for distributing random access of a terminal by a base station includes transmitting a paging message indicating network reentry to each group of terminal groups.
  • the paging message may include at least one of identifier information of each terminal group and random access configuration information for each terminal group.
  • the random access configuration information may include random access wait time information and backoff window size information corresponding to each terminal group.
  • Each terminal group is grouped based on application type and characteristics. In this case, the terminal may be a machine to machine (M2M) type.
  • the random access wait time for each terminal group may be determined based on the random access priority for each terminal group.
  • the method includes random access through random access opportunity (ranging opportunity in IEEE 802.16m system) according to random access latency information and backoff window size information corresponding to each terminal group from each terminal group.
  • the method may further include receiving a code.
  • a method for performing random access by a terminal in a wireless communication system includes receiving a paging message indicating network reentry from a base station, wherein the paging message is the terminal. It may include at least one of identifier information of the grouped terminal group and random access configuration information corresponding to the terminal group.
  • the random access configuration information may include random access wait time information and backoff window size information of the terminal group.
  • the method may further include selecting a random access opportunity (ranging opportunity in an IEEE 802.16m system) based on the random access configuration information.
  • the method may further comprise transmitting a random access code to the base station at the selected random access opportunity.
  • the grouped terminal group may be grouped based on at least one of an application type and characteristics of the terminal, and the terminal may be a machine to machine (M2M) device type.
  • the random access wait time of the terminal group may be determined based on the random access priority of the terminal group.
  • a base station apparatus for distributing random access of terminals includes a transmitter for transmitting a paging message indicating network reentry to each group of terminal groups, wherein the paging is performed.
  • the message may include at least one of identifier information of each terminal group and random access configuration information for each terminal group.
  • a terminal device performing random access in a wireless communication system includes a receiver for receiving a paging message indicating network re-entry from a base station, wherein the paging message is
  • the terminal may include at least one of identifier information of a group of terminals grouped and random access configuration information corresponding to the terminal group.
  • the terminal device may further include a processor for selecting a random access opportunity (ranging opportunity in an IEEE 802.16m system) based on the random access configuration information, and transmits a random access code to the base station at the selected random access opportunity.
  • the apparatus may further include a transmitter.
  • grouping M2M terminals to set contention resolution levels differently for each paging terminal group to distribute random access for each paging terminal group and also set back-off window ranges for M2M terminals belonging to the same paging terminal group.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • FIG. 2 is a diagram illustrating an example of a process for interaction after a network entry or reentry between a base station and an idle terminal in an IEEE 802.16 system.
  • FIG. 3 is a view for explaining an example of a random access distribution method for each step according to an embodiment of the present invention.
  • FIG. 4 is a view for explaining an example of a random access distribution method for each step according to an embodiment of the present invention.
  • FIG. 5 is a view for explaining another example of the random access distribution method for each step according to an embodiment of the present invention.
  • the mobile communication system is an Institute of Electrical and Electronics Engineers (IEEE) 802.16 system, a 3rd Generation Partnership Project (3GPP), but is unique to the IEEE 802.16 system and 3GPP. It is applicable to any other mobile communication system except for this.
  • IEEE Institute of Electrical and Electronics Engineers
  • 3GPP 3rd Generation Partnership Project
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like.
  • the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a base station (BS), and an access point (AP).
  • a terminal may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
  • Information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of information transmitted or received by the terminal.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • the wireless communication system 100 may include one or more base stations and / or one or more terminals. .
  • the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 197.
  • the terminal 110 transmits (Tx) the data processor 165, the symbol modulator 175, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
  • the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a multiple input multiple output (MIMO) system. In addition, the base station 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
  • MIMO multiple input multiple output
  • SU-MIMO single user-MIMO
  • MU-MIMO multi-user-MIMO
  • the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
  • the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
  • the symbol modulator 120 multiplexes the data and pilot symbols and sends them to the transmitter 125.
  • each transmission symbol may be a data symbol, a pilot symbol, or a null signal value.
  • pilot symbols may be sent continuously.
  • the pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.
  • Transmitter 125 receives a stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency up-converts) these analog signals, A downlink signal suitable for transmission over a wireless channel is generated, and then the transmitting antenna 130 transmits the generated downlink signal to the terminal.
  • the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
  • the symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
  • the processing by symbol demodulator 145 and receiving data processor 150 is complementary to the processing by symbol modulator 120 and transmitting data processor 115 at base station 105, respectively.
  • the terminal 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
  • the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
  • the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
  • the transmit antenna 135 transmits the generated uplink signal to the base station 105.
  • an uplink signal is received from the terminal 110 through the reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
  • the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
  • the received data processor 197 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.
  • the processor 155 of the terminal 110 and the processor 180 of the base station 105 instruct (eg, control, coordinate, manage, etc.) the operation in the terminal 110 and the base station 105, respectively.
  • Respective processors 155 and 180 may be connected to memories 160 and 185 that store program codes and data.
  • the memory 160, 185 is coupled to the processor 155, 180 to store operating systems, applications, and general files.
  • the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
  • the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
  • the layers of the air interface protocol between the terminal 110 and the base station 105 between the wireless communication system (network) are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. , Second layer L2, and third layer L3.
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
  • the M2M communication device may be variously named as an M2M device, an M2M communication device, an M2M terminal, a Machine Type Communication (MTC) device, or an MTC terminal.
  • MTC Machine Type Communication
  • the existing terminal may be referred to as a human type communication (HTC) terminal. In the present invention, it will be used as a unified M2M device.
  • the number of M2M devices will gradually increase in certain networks as the machine application type increases.
  • the types of device applications under discussion include (1) security, (2) public safety, (3) tracking and tracing, (4) payment, and (5) healthcare. health care, (6) remote maintenance and control, (7) metering, (8) consumer devices, (9) point of sales (POS) and In the security-related application market, Logistics Management, (10) Vending Machine-to-Vending Machine Communication, (11) Remote Monitoring of Machines and Facilities, Hours of Operation on Construction Machinery Equipment and Automatic Measurement of Heat or Electricity Usage Smart Meter, (12) Surveillance Video communication of a surveillance camera, etc., but need not be limited thereto, and various device application types have been discussed. As the device application type increases, the number of M2M devices may increase dramatically compared to the number of general mobile communication devices.
  • M2M device Depending on the characteristics of the M2M device, there is a point in which traffic is transmitted to the base station in a long-term or periodic manner, or an event is triggered to transmit data. That is, most of the M2M device can remain idle and wake up when the cycle returns or an event is triggered, and can enter the active state. And, depending on the characteristics of the M2M device, some M2M device (eg, metering or vending machine) may be less or less mobile. Other M2M devices (eg tracking and tracing or fleet management) may be highly mobile. As the application types of M2M devices continue to increase, there will be numerous such M2M devices in the same base station. Accordingly, the base station needs to smoothly support random access of a myriad of M2M terminals that remain idle.
  • the base station configures a paging terminal group (or M2M group) for the M2M terminals in the idle state, and the base station provides the identifier allocation and random access configuration information for the paging terminal group for each paging terminal group by paging terminal group It is possible to support random access by distributing random access and distributing random access of M2M terminals even within the same paging terminal group.
  • the base station may first configure a paging terminal group and assign a paging terminal group identifier to the paging terminal as a method for distributing random access of the paging terminals.
  • a brief description of the identifier used to distinguish the existing terminals in the wireless communication system will be described with respect to the process for the base station to download the PDCCH to the terminal.
  • the base station determines the PDCCH format according to the downlink control information (DCI) to be sent to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
  • CRC Cyclic Redundancy Check
  • RNTI Radio Network Temporary Identifier
  • STID Selection IDentifier
  • a unique identifier of the terminal for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • a paging indication identifier for example, P-RNTI (P-RNTI) may be masked to the CRC.
  • P-RNTI P-RNTI
  • SI-RNTI system information identifier
  • RA-RNTI random access-RNTI
  • the PDCCH When the C-RNTI is used, the PDCCH carries control information for a specific specific terminal, and when another RNTI is used, the PDCCH carries common control information received by all or a plurality of terminals in a cell.
  • the base station performs channel coding on the DCI to which the CRC is added to generate coded data.
  • the base station performs rate matching according to the number of CCEs allocated to the PDCCH format.
  • the base station then modulates the encoded data to generate modulation symbols.
  • the base station maps modulation symbols to physical resource elements.
  • the base station uses the RNTI as the terminal identifier in the LTE system and the STID as the terminal identifier in the IEEE 802.16 system.
  • the idle state (Idle State) or idle mode (Idle Mode) ).
  • Idle State or Idle Mode operation generally supports the transmission of downlink broadcast traffic periodically even when the UE moves in a radio link environment composed of multiple base stations, even if it is not registered to a specific base station. It refers to the action that makes.
  • the terminal may transition to the idle state to save power.
  • the terminal transitioning to the idle mode may receive a broadcast message (for example, a paging message) broadcast by the base station for an available interval and determine whether to transition to the normal mode or remain idle. have.
  • the terminal in the idle state may notify the location of the paging controller (Paging controller) by performing the location update.
  • the idle state can benefit the terminal by eliminating the active and general operational requirements associated with the handover.
  • the idle state may limit the terminal activity to be scanned in discrete cycles, thereby saving power and operational resources used by the terminal.
  • the idle state provides a simple and appropriate way to inform the terminal of downlink traffic pending, and removes the network interface and network handover (HO) traffic from the inactive terminal.
  • the base station can benefit.
  • Paging refers to a function of identifying a location (eg, any base station or a switching center) of a corresponding terminal when an incoming call occurs in mobile communication.
  • a plurality of base stations supporting the idle state or the idle mode may belong to a specific paging group to configure a paging area.
  • the paging group represents a logical group.
  • the purpose of a paging group is to provide an adjacent coverage area that can be paged in downlink if there is traffic targeting the terminal.
  • the paging group is preferably configured to meet the condition that a particular terminal is large enough to exist for most of the time in the same paging group, and that the paging load should be small enough to maintain an appropriate level.
  • the paging group may include one or more base stations, and one base station may be included in one or more paging groups.
  • Paging groups are defined in the management system. Paging groups can use paging group-action backbone network messages.
  • the paging controller may manage a list of idle terminals and manage initial paging of all base stations belonging to a paging group by using a paging-announce message, which is one of backbone network messages.
  • FIG. 2 is a diagram illustrating an example of a process for interaction after a network entry or reentry between a base station and an idle terminal in an IEEE 802.16 system.
  • each base station in the same paging group to which the terminal (s) belongs to the network (re) to them in the listening interval of the terminal (s) The paging message requesting entry is transmitted (S210).
  • the terminal includes its information (eg, at least one of a paging group ID (PGID), a deregistration ID (DID) and a paging cycle) in the paging message; If there is a need to perform a procedure for switching to the active state (S220). That is, idle terminals may perform a procedure such as random access for network entry (S220). For example, in the IEEE 802.16 system, the idle terminal may perform a network reentry procedure such as ranging, basic performance negotiation, registration, and the like. Meanwhile, the idle terminal in the LTE system may perform an RRC connection (re) establishment procedure.
  • the base station allocates the TSTID and the STID to the idle UE, but in the 3GPP LTE and LTE-A systems, the base station may allocate the RNTI and the M2M group identifier (ID) to the idle UE.
  • ID M2M group identifier
  • the idle terminal transmits a ranging request message (eg, AAI-RNG-REQ) to the base station, and in response, the base station transmits a TSTID (Temporary STID), which is a temporary space identifier assigned to the idle terminal.
  • a ranging response message (eg, AAI-RNG-RSP) may be transmitted (S230).
  • the idle terminal may exchange an SBC-REQ / RSP message with the base station and perform an authorization process with the base station (S235).
  • the idle terminal transmits a registration request message (for example, AAI-REG-REQ) to the base station, and in response, the base station assigns an STID to the idle terminal and registers with a registration response message (for example, AAI-REG-REQ).
  • REQ-RSP can be included in the transmission (S240).
  • the idle terminal and the base station may transmit and receive a dynamic service related message (eg, AAI-DSx-REQ / RSP) to each other (S250). Thereafter, the idle terminal and the base station can transmit and receive downlink / uplink data (S260).
  • a dynamic service related message eg, AAI-DSx-REQ / RSP
  • the network may request network re-entry to multiple M2M terminals for the same time or for a short period of time.
  • the signaling overhead may increase and a paging delay may be long. Therefore, the load related to paging may be greatly reduced by paging by group instead of individual terminal units.
  • the base station can wake up all terminals belonging to the group by including one group identifier and a request operation in the paging message.
  • group IDs requiring network (re) entry may exist in one paging message transmitted by the base station, and all M2M terminals belonging to the corresponding group IDs compete with each other in a random access procedure. That is, many M2M terminals perform random access at the same time of receiving one paging message. Uplink interference occurs when many M2M terminals attempt random access at the same time, and there is a problem that a probability of collision between terminals attempting random access (including not only M2M terminals but also HTC terminals) may increase. Therefore, there is a need for a method for distributing random access of these M2M terminals.
  • the M2M terminal transmits its type and characteristics to the base station in the process of entering (or re-entering) the network or switching to the idle state.
  • M2M terminal type or machine type Prior to the M2M terminal type or machine type (Machine Application Type) (1) security, (2) public safety, (3) tracking and tracing, (4) payment (payment) (5) healthcare, (6) remote maintenance and control, (7) metering, (8) consumer devices, (9) point of sale systems , Point of sales and security-related application markets, (10) Fleet Management, (10) Vending Machine-to-Vending Machines, (11) remote monitoring of machinery and equipment, and measurement of operating time on construction machinery. For example, Smart Meter, which measures electricity consumption automatically, and Surveillance Video communication of surveillance cameras are examples. This is only an example and the M2M terminal application type may be more diverse.
  • the characteristics of the M2M terminal for example, in the case of Fleet Management in the security-related application market of (9), there may be characteristics such as in-service / waiting / service interruption.
  • Surveillance video type characteristics of the surveillance camera may be always on (always on) / triggered when the event occurs, whether the real-time traffic, whether there is mobility or the like.
  • the M2M terminal may inform the base station of its type and characteristics in the process of entering (or re-entering) the network or switching to the idle state.
  • the M2M terminal may change the type and characteristics of the terminal in a network (re) entry procedure, for example, ranging request message, The message may be transmitted to the base station through any one of a registration request message, a basic capability negotiation message, and a dynamic service related message.
  • the M2M terminal may transmit to the base station through a message such as deregistration, for example, in the procedure of switching the information about the type and the characteristic to the idle state.
  • the M2M terminal may transmit information about the type and characteristics of the terminal, for example, in a network connection (re) establishment procedure. It can be transmitted to the base station through any one of the messages related to the configuration. In addition, the M2M terminal may transmit to the base station through a message related to, for example, a connection release in the procedure of switching the information about the type and characteristics to the idle state.
  • a network connection (re) establishment procedure e.g., HSDPA, UMTS, LTE
  • the M2M terminal may transmit information about the type and characteristics of the terminal, for example, in a network connection (re) establishment procedure. It can be transmitted to the base station through any one of the messages related to the configuration.
  • the M2M terminal may transmit to the base station through a message related to, for example, a connection release in the procedure of switching the information about the type and characteristics to the idle state.
  • the present invention describes a method of determining priority for each M2M terminal for a random access distribution method of the proposed M2M terminals.
  • the base station may transmit information on the type and characteristics of the M2M terminal to a paging controller (PC) or a mobility management entity (MME). Then, the paging controller PC or the mobile management entity MME may perform grouping of the terminal according to the type and characteristic of the corresponding M2M terminal and allocate a paging group identifier for each grouped group. Since the term paging group identifier is already used in the existing system to mean an identifier of a group of logical divisions of base stations in a single operator network, in the present invention, the term refers to a group identifier grouped based on the type and characteristics of the M2M terminal. It is referred to as "Paging Mobile Station (Device) Group Identifier" (PMGID). However, such a title is only an example and is not limited thereto.
  • PMGID Paging Mobile Station (Device) Group Identifier
  • the processor 180 of the base station may be configured to include M2M terminals having the same type and / or characteristics in one paging terminal group.
  • the processor 180 of the base station may determine the priority for random access for each paging terminal group.
  • the processor 180 of the base station may allocate a contention resolution level for random access for each paging terminal group according to priority. For example, the processor 180 of the base station assigns a contention resolution level 1 to the paging terminal group having the highest priority, and then sequentially matches the contention resolution levels 2, 3,. N can be assigned to each.
  • Random access wait time (or may be referred to as waiting offset time, etc.) corresponding to a contention resolution level (eg, contention resolution level 1) assigned to a high-priority group has a relative priority. This may be shorter than the random access latency of the contention resolution levels (eg, contention resolution levels 2, 3,... N) assigned to the lower group. That is, the random access wait time of M2M terminals of the high priority paging terminal group may be shorter.
  • the random access latency, the backoff window size, etc. may be defined in advance according to the contention resolution level, and this information may be shared between the base station and the terminals.
  • the base station may determine a contention resolution level, random access latency and backoff window size through a paging message and deliver the paging terminal group.
  • the paging message may include random access configuration information, and the random access configuration information may include random access parameters.
  • the contention resolution level, random access latency information, backoff window size information, and the like may be random access parameters.
  • Table 2 below shows an example of random access latency and backoff window size information corresponding to contention resolution levels.
  • the random access wait time waits until M2M terminals belonging to a specific paging terminal group receive a paging message from the base station requesting network re-entry from the base station and perform a random access procedure (ie, backoff algorithm start point). It means time.
  • the backoff window size means a maximum time or maximum number of random access opportunities / RACHs that the terminal can wait until the random access waiting time ends and the random access code is transmitted.
  • the corresponding backoff window size is a general terminal (eg, uplink channel descriptor (UCD) in IEEE 802.16e system, superframe header (SFH) in IEEE 802.16m system, and BCH in 3GPP).
  • UCD uplink channel descriptor
  • FSH superframe header
  • BCH BCH in 3GPP
  • it may be defined as a value obtained by multiplying a backoff value and a contention resolution level for the HTC terminal, and the M2M terminal may transmit a random access code after waiting for a randomly selected value within the corresponding window size. have. This will be described later.
  • a group of paging terminals is grouped based on the type and / or characteristics of M2M terminals, and a different contention resolution level for each grouped paging terminal group is set.
  • the processor 180 of the base station may allocate a contention resolution level having a different random access wait time for each paging terminal group.
  • M2M terminals within a paging terminal group or assigned the same contention resolution level may be further distributed by randomly selecting a value within a back-off window size interval and attempting random access at a corresponding value timing. .
  • the processor 180 of the base station may allocate a differentiated backoff window size interval to the M2M terminal according to the paging terminal group or the contention resolution level.
  • the size of a minimum backoff window of a general terminal transmitted by a base station through system information is 0 to 7, and randomly every 5 ms. There are two random access opportunities.
  • the base station, the paging controller, or the mobile management entity (MME) may transmit the size information of the maximum backoff window (maximum backoff window) to the M2M terminals.
  • the minimum backoff window is used in the first contention resolution.
  • the maximum backoff window means the maximum size that can be increased.
  • FIG. 3 is a view for explaining an example of a random access distribution method for each step according to an embodiment of the present invention.
  • the base station determines a paging terminal group identifier PMGID A, contention resolution level 1, and random access waiting time to 25 ms for M2M terminal 1 (MTC 1) and M2M terminal 3 (MTC 3) and transmits the same to the corresponding M2M terminals.
  • MTC 1 M2M terminal 1
  • MTC 3 M2M terminal 3
  • the processor 180 of the base station may calculate the backoff window size of the M2M terminal corresponding to the contention resolution level allocated to the minimum backoff window size value of the general terminal and the corresponding paging terminal group (or corresponding M2M group).
  • the description of the method for calculating the maximum backoff window size will be omitted.
  • the processor 180 of the base station may calculate a backoff window size of the M2M terminal by calculating a minimum backoff window start value and end value for the M2M terminal.
  • the processor 180 of the base station may calculate a minimum backoff window start value for the M2M terminal using Equation 1 below.
  • Minimum Backoff window start value Minimum backoff window start value for normal terminal * Contention resolution level
  • the processor 180 of the base station assigns the minimum backoff window start value 0 for the general terminal and M2M terminals 1 and 3 to each other.
  • the processor 180 of the base station may calculate a minimum backoff window end value for the M2M terminal by using Equation 2 below.
  • Minimum Backoff window end value Minimum backoff window end value for normal terminal * Contention resolution level
  • the processor 180 of the base station may calculate a minimum backoff window end value for the M2M terminals 1 and 3 by using the following equation (3) as another example.
  • M2M terminal's minimum backoff window end value 2 x + (conflict resolution level-1)-1
  • x is the minimum backoff window end value of the general terminal transmitted through the system information.
  • the backoff window start value may be fixed to a specific value (for example, 0).
  • the base station may transmit a paging message including a paging terminal group identifier PMGID A and an action code indicating network re-entry to M2M terminal 1 and M2M terminal 3.
  • the base station may transmit to the M2M terminal 1 and the M2M terminal 3 in the paging message further including information on the contention resolution level (for example, contention resolution level 1), random access latency and backoff window size information. have.
  • the M2M terminal 1 and the M2M terminal 3 may know the random access waiting time and the backoff window size section corresponding to the contention resolution level 1 received.
  • the processor 155 of the M2M terminal may select an arbitrary backoff window value (or random access opportunity) within the backoff window size section (backoff windows 0 to 7).
  • the processor 155 of the M2M terminal 1 may select an arbitrary backoff window value 1, and as shown in FIG. 3, the M2M terminal 1 may transmit a random access code at a corresponding opportunity.
  • the processor 155 of the M2M terminal 3 may also select an arbitrary backoff window value 7, and as shown in FIG. 3, the M2M terminal 3 may transmit a random access code at a corresponding opportunity.
  • random access in a random access opportunity corresponding to a corresponding backoff window value based on a randomly selected backoff window value within a backoff window range set within the same paging terminal group or between M2M terminals assigned the same contention resolution level.
  • FIG. 4 is a view for explaining an example of a random access distribution method for each step according to an embodiment of the present invention.
  • the base station determines a paging terminal group identifier PMGID B, a contention resolution level 2, and a random access wait time of 40 ms for the M2M terminal 2 (MTC 2) and the M2M terminal 4 (MTC 4), and transmits the same to the corresponding M2M terminals.
  • the base station may transmit a paging message including a paging terminal group identifier PMGID B and an action code indicating network re-entry to M2M terminal 2 and M2M terminal 4.
  • the base station may further transmit to the M2M terminal 2 and the M2M terminal 4 including information on the contention resolution level (for example, contention resolution level 2), the access waiting time and backoff window size information.
  • the M2M terminal 2 and the M2M terminal 4 may know the random access waiting time and the backoff window size section corresponding to the contention resolution level 2 received.
  • the processor 180 of the base station may calculate the backoff window sizes for the M2M terminals 2 and 4 according to the contention resolution level and the minimum backoff window size value of the general terminal.
  • the processor 180 of the base station may calculate a backoff window size of the M2M terminal by calculating a minimum backoff window start value and end value for the M2M terminal.
  • the processor 180 of the base station may calculate a minimum backoff window starting value for the M2M terminals 2 and 4 by using Equation 1 above.
  • the M2M terminal 2 and the M2M terminal 4 may receive a random access waiting time (for example, 40 ms) and a backoff window size interval (0 to 15) corresponding to the contention resolution level 2 received from the base station.
  • a random access waiting time for example, 40 ms
  • a backoff window size interval (0 to 15) corresponding to the contention resolution level 2 received from the base station.
  • each of the processors 155 of the M2M terminals 2 and 4 may select an arbitrary backoff window value within a backoff window size section (backoff windows 0 to 15).
  • the processor 155 of the M2M terminal 2 may select an arbitrary backoff window value 2, and as shown in FIG. 4, the M2M terminal 2 may transmit a random access code at a corresponding opportunity.
  • the processor 155 of the M2M terminal 4 may also select an arbitrary backoff window value 9, and as shown in FIG. 4, the M2M terminal 4 may transmit a random access code at a corresponding opportunity.
  • FIGS. 3 and 4 illustrate an example of a random access distribution method for M2M terminals belonging to a specific paging terminal group, but in FIG. 5, not only a specific paging terminal group (or M2M group) but also a specific paging terminal group. A method of distributing random access by varying connection waiting time will be described.
  • FIG. 5 is a view for explaining another example of the random access distribution method for each step according to an embodiment of the present invention.
  • the processor 155 of the base station groups the M2M terminal 1 (MTC 1) and the M2M terminal 3 (MTC 3) into one paging terminal group and allocates a paging terminal group identifier PMGID A.
  • the processor 155 of the base station groups the M2M terminal 2 (MTC 2) and the M2M terminal 4 (MTC 4) into another paging terminal group and allocates a paging terminal group identifier PMGID B.
  • the processor 155 of the base station may assign contention resolution level 1 to the paging terminal group identifier PMGID A and assign contention resolution level 2 to the paging terminal group identifier PMGID B.
  • the base station may deliver a contention resolution level value allocated to each paging terminal group. In this case, the base station may inform the paging terminal group of the random access wait time information and the backoff window size section information corresponding to each contention resolution level.
  • the contention resolution level (that is, contention resolution level 1), random access latency (25ms), and backoff window size intervals allocated in FIG. 3.
  • the contention resolution level ie, contention resolution level 2
  • random access latency 40 ms
  • backoff window size section information (0 to 15) allocated in FIG.
  • the M2M terminals 1 and 3 may receive an action code indicating a paging terminal group identifier PGMID A and network re-entry through a paging message from a base station.
  • the M2M terminals 2 and 4 may also receive an action code indicating network re-entry with the paging terminal group identifier PGMID B through a paging message from the base station.
  • each paging terminal group waits for a corresponding random access waiting time after receiving the paging message.
  • Each terminal in each paging terminal group selects a random access opportunity based on the indicated backoff window size information.
  • the M2M terminals 1 and 3 assigned the contention resolution level 1 with the paging terminal group identifier PMGID A wait for the random access wait time of 25 ms and then random access code at randomly selected random access opportunity within the indicated backoff window range. Can be transmitted respectively.
  • the M2M terminal 1 may arbitrarily select a backoff window value 1, and transmit a random access code at a random access opportunity corresponding to the backoff window value.
  • the M2M terminal 3 may arbitrarily select a backoff window value of 7 and transmit a random access code at a random access opportunity corresponding to the backoff window value.
  • random access between M2M terminals having the same contention resolution level 1 is distributed.
  • M2M terminals 2 and 4 assigned with paging terminal group identifier PMGID B and contention resolution level 2 wait for the corresponding random access wait time 40 ms, and then select random access codes from random access opportunities randomly selected in the indicated backoff window size interval.
  • Can transmit In this case, as shown in FIG. 5, the M2M terminal 2 may arbitrarily select the backoff window value 2, and transmit a random access code at a random access opportunity corresponding to the backoff window value.
  • the M2M terminal 4 may arbitrarily select a backoff window value of 9 and transmit a random access code at a random access opportunity corresponding to the backoff window value.
  • random access between M2M terminals having the same contention resolution level 2 is distributed.
  • the base station allocates different random access wait times by allocating different contention resolution levels among the paging terminal group identifiers, thereby distributing random access attempts among the paging terminal groups.
  • a method for distributing random access, a method for distributing random access, and an apparatus therefor are available industrially in various communication systems such as 3GPP LTE, LTE-A, and IEEE 802.

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Abstract

L'invention concerne un procédé pour propager un accès aléatoire et un procédé pour propager et réaliser l'accès aléatoire. Selon l'invention, un procédé pour réaliser un accès aléatoire d'un terminal comprend l'étape de réception d'un message de recherche de personnes indicatif d'une rentrée de réseau à partir d'une station de base, ledit message de recherche de personnes pouvant contenir au moins soit les informations d'identifiants de groupes de terminaux, dans lesquels les terminaux sont regroupés, soit les informations de configuration d'accès aléatoire qui correspondent auxdits groupes de terminaux. Lesdites informations de configuration d'accès aléatoire peuvent contenir des informations de temps d'attente d'accès aléatoire desdits groupes de terminaux et des informations de taille de fenêtre de réduction de puissance. Ledit procédé comprend en outre les étapes de : sélection d'une possibilité d'accès aléatoire en fonction desdites informations de configuration d'accès aléatoire ; et transmission d'un code d'accès aléatoire à ladite station de base au cours de ladite possibilité d'accès aléatoire sélectionnée.
PCT/KR2011/005476 2010-07-25 2011-07-25 Procédé pour propager un accès aléatoire, procédé pour propager et réaliser un accès aléatoire et dispositif associé Ceased WO2012015206A2 (fr)

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US36745010P 2010-07-25 2010-07-25
US61/367,450 2010-07-25
US36746110P 2010-07-26 2010-07-26
US61/367,461 2010-07-26
KR1020110073768A KR20120025392A (ko) 2010-07-25 2011-07-25 임의접속을 분산하는 방법 및 임의접속을 분산하여 수행하는 방법과 이를 위한 장치
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174745A1 (fr) * 2014-05-14 2015-11-19 엘지전자 주식회사 Procédé d'exécution d'une procédure d'accès aléatoire dans un dispositif de mtc
WO2018083376A1 (fr) * 2016-11-03 2018-05-11 Nokia Technologies Oy Configuration de canal d'accès aléatoire dédié
KR20200019797A (ko) * 2017-03-22 2020-02-24 엘지전자 주식회사 랜덤 액세스 백오프 파라미터를 조정하는 방법 및 장치

Family Cites Families (1)

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KR20080079961A (ko) * 2007-02-28 2008-09-02 엘지전자 주식회사 광대역 무선 접속 시스템에서의 레인징 수행 방법

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174745A1 (fr) * 2014-05-14 2015-11-19 엘지전자 주식회사 Procédé d'exécution d'une procédure d'accès aléatoire dans un dispositif de mtc
WO2018083376A1 (fr) * 2016-11-03 2018-05-11 Nokia Technologies Oy Configuration de canal d'accès aléatoire dédié
KR20200019797A (ko) * 2017-03-22 2020-02-24 엘지전자 주식회사 랜덤 액세스 백오프 파라미터를 조정하는 방법 및 장치
KR102125539B1 (ko) 2017-03-22 2020-06-23 엘지전자 주식회사 랜덤 액세스 백오프 파라미터를 조정하는 방법 및 장치
US11057804B2 (en) 2017-03-22 2021-07-06 Lg Electronics Inc. Method and device for adjusting random access backoff parameter

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