USRE49324E1 - Method and terminal for random access to small cell - Google Patents

Method and terminal for random access to small cell Download PDF

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Publication number
USRE49324E1
USRE49324E1 US17/089,623 US201317089623A USRE49324E US RE49324 E1 USRE49324 E1 US RE49324E1 US 201317089623 A US201317089623 A US 201317089623A US RE49324 E USRE49324 E US RE49324E
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Prior art keywords
random access
subframe
cell
access preamble
preamble
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Inventor
Daesung Hwang
Hakseong Kim
Suckchel YANG
Seungmin Lee
Hyangsun You
Yunjung Yi
Dongyoun Seo
Hanbyul Seo
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point

Definitions

  • the present invention relates to a method and a user equipment for performing random access.
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is an improved version of a universal mobile telecommunication system (UMTS) and is introduced as the 3GPP release 8.
  • the 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in a downlink, and uses single carrier-frequency division multiple access (SC-FDMA) in an uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-advanced
  • a terminal performs random access in order to access a network. Random access can be divided into contention-based random access and non-contention-based random access. The greatest difference between contention-based random access and non-contention-based random access is whether or not a random access preamble is dedicated to one terminal. In non-contention-based random access, a contention (or collision) with other terminals is not generated because a terminal uses a dedicated random access preamble designated thereto.
  • a contention means that two or more terminals attempt random access using the same random access preamble through the same resources. In contention-based random access, there is a possibility of a contention because a terminal uses a randomly selected random access preamble.
  • Random access is performed in order to perform uplink synchronization or to request the allocation of uplink radio resources. For example, after being initially powered on, a terminal can perform downlink synchronization and then perform random access in order to obtain uplink synchronization. For another example, in the state in which a Radio Resource Control (RRC) connection has not been established, a terminal can perform random access in order to have uplink radio resources for uplink transmission allocated thereto. For yet another example, a terminal may perform random access in order to initially access a target base station in a handover process.
  • RRC Radio Resource Control
  • the present specification introduces a PRACH preamble of new format, and to provide various methods for using the PRACH preamble of new format.
  • a method for performing random access by a user equipment for a small cell may comprise: receiving a plurality of configurations for a random access preamble; selecting one of the plurality of configurations; and transmitting the random access preamble according to a selected configuration.
  • the random access preamble is transmitted on at least one resource in a subframe including plural resources on which the random access preamble is capable of being transmitted. And a preamble transmitted on each resource is uniquely distinguishable.
  • Locations of the plurality of resources may be aligned with a boundary of the subframe. Alternatively, locations of the plurality of resources may be aligned with a boundary of each slot in the subframe. Also, locations of the plurality of resources may be aligned with a boundary of a group of OFDMA or SC-FDMA symbols.
  • the method may further comprise: receiving a random access response including RA-RNTI.
  • the RA-RNTI may be calculated by a location index of the resource within a subframe index on which the preamble is transmitted and the subframe.
  • a length of the random access preamble transmitted on the resource may be shorter than a length of 3 OFDMA or SC-FDMA symbols in case of normal CP, and may be shorter than a length of 2 OFDMA or SC-FDMA symbols in case of extended CP.
  • the plurality of configurations may be received through system information. And, the plurality of configurations may include a configuration of format 0 to 4 for PRACH preamble and a configuration of new format which is different from the format 0 to 4.
  • the new format may be generated based on format 4 for PRACH preamble.
  • the user equipment preferentially may selects configuration of new format.
  • the subframe may be downlink subframe.
  • the small cell may be a pico cell, femto cell, Home (e)NodeB or CSG cell
  • a user equipment for performing random access for a small cell.
  • the UE may comprise: a radio frequency (RF) unit configured to receive a plurality of configurations for random access preamble; and a processor configured to control the RF unit, to select one of the plurality of configurations and to transmit the random access preamble according to the selected configuration.
  • the random access preamble is transmitted on at least one resource in a subframe including plural resources on which the random access preamble is capable of being transmitted. A preamble transmitted on each resource is uniquely distinguishable
  • the overhead when performing random access for the purpose of initial access, handover, uplink synchronization, etc for a small cell of which coverage radius is small, for example, a pico cell, by transmitting the PRACH preamble of new format, the overhead can be decreased. In addition, even in case of a macro cell, the overhead can be decreased efficiently by using the PRACH preamble of new format.
  • FIG. 1 illustrates a wireless communication system
  • FIG. 2 shows a downlink radio frame structure in 3rd generation partnership project (3GPP) long term evolution (LTE).
  • 3GPP 3rd generation partnership project
  • LTE long term evolution
  • FIG. 3 shows a downlink radio frame structure according to TDD in 3GPP LTE.
  • FIG. 4 illustrates an example resource grid for one uplink or downlink slot in 3GPP LTE.
  • FIG. 5 illustrates the architecture of a downlink sub-frame.
  • FIG. 6 illustrates the architecture of an uplink sub-frame in 3GPP LTE.
  • FIG. 7 is a block diagram illustrating the radio protocol architecture.
  • FIG. 8 is a diagram showing a contention-based random access method.
  • FIG. 9 is a diagram showing a non-contention-based random access method.
  • FIG. 10 is a diagram showing the structure of a random access preamble.
  • FIGS. 11a through 11d are an exemplary view illustrating a structure of a new PRACH preamble according to an embodiment suggested in the present specification.
  • FIGS. 12a and 12b illustrate a method for notifying configuration for the PRACH preamble to a UE.
  • FIG. 13 illustrates an example in which a plurality of preambles is transmitted in a subframe.
  • FIG. 14 is a block diagram showing a wireless communication system in which an embodiment of the present invention is implemented.
  • the present invention will be described on the basis of a universal mobile telecommunication system (UMTS) and an evolved packet core (EPC).
  • UMTS universal mobile telecommunication system
  • EPC evolved packet core
  • the present invention is not limited to such communication systems, and it may be also applicable to all kinds of communication systems and methods to which the technical spirit of the present invention is applied.
  • technological terms used herein are merely used to describe a specific embodiment, but not to limit the present invention. Also, unless particularly defined otherwise, technological terms used herein should be construed as a meaning that is generally understood by those having ordinary skill in the art to which the invention pertains, and should not be construed too broadly or too narrowly. Furthermore, if technological terms used herein are wrong terms unable to correctly express the spirit of the invention, then they should be replaced by technological terms that are properly understood by those skilled in the art. In addition, general terms used in this invention should be construed based on the definition of dictionary, or the context, and should not be construed too broadly or too narrowly.
  • first, second, etc. can be used to describe various elements, but the elements should not be limited by those terms. The terms are used merely to distinguish an element from the other element. For example, a first element may be named to a second element, and similarly, a second element may be named to a first element.
  • a wireless device may be fixed or mobile, and may be referred to as another terminology, such as a terminal, a mobile terminal (MT), a user equipment (UE), a mobile equipment (ME), a mobile station (MS), a user terminal (UT), a subscriber station (SS), a handheld device, an access terminal (AT), etc.
  • MT mobile terminal
  • UE user equipment
  • ME mobile equipment
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • AT access terminal
  • a base station is generally a fixed station that communicates with the UE and may be referred to as another terminology, such as an evolved Node-B (eNB), a base transceiver system (BTS), an access point, etc.
  • eNB evolved Node-B
  • BTS base transceiver system
  • access point etc.
  • 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
  • the CDMA can be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • UTRA universal terrestrial radio access
  • the TDMA can be implemented with a radio technology such as global system for mobile communications (GSM)/general packet ratio service (GPRS)/enhanced data rate for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet ratio service
  • EDGE enhanced data rate for GSM evolution
  • the OFDMA can be implemented with a radio technology such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), etc.
  • IEEE 802.16m is evolved from IEEE 802.16e, and provides backward compatibility with an IEEE 802.16e-based system.
  • the UTRA is a part of a universal mobile telecommunication system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of an evolved UMTS (E-UMTS) using the E-UTRA.
  • 3GPP LTE uses the OFDMA in a downlink and uses the SC-FDMA in an uplink.
  • LTE-advanced (LTE-A) is evolved from the 3GPP LTE.
  • FIG. 1 Illustrates a Wireless Communication System.
  • the wireless communication system includes at least one base station (BS) 20 .
  • Each base station 20 provides a communication service to specific geographical areas (generally, referred to as cells) 20 a, 20 b, and 20 c.
  • the cell can be further divided into a plurality of areas (sectors).
  • a terminal (user equipment, UE) 10 may be fixed or movable and may be called other terms such as a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), a wireless modem, a handheld device, and the like.
  • the base station 20 generally represents a fixed station that communicates with the terminal 10 , and may be called different terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like.
  • the terminal generally belongs to one cell and the cell to which the terminal belong is referred to as a serving cell.
  • a base station that provides the communication service to the serving cell is referred to as a serving BS. Since the wireless communication system is a cellular system, another cell that neighbors to the serving cell is present. Another cell which neighbors to the serving cell is referred to a neighbor cell.
  • a base station that provides the communication service to the neighbor cell is referred to as a neighbor BS.
  • the serving cell and the neighbor cell are relatively decided based on the terminal.
  • a downlink means communication from the base station 20 to the terminal 10 and an uplink means communication from the terminal 10 to the base station 20 .
  • a transmitter may be a part of the base station 20 and a receiver may be a part of the terminal 10 .
  • the transmitter may be a part of the terminal 10 and the receiver may be a part of the base station 20 .
  • the wireless communication system may be any one of a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MISO) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
  • MIMO multiple-input multiple-output
  • MISO multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
  • the MISO system uses a plurality of transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and one receive antenna.
  • the transmit antenna means a physical or logical antenna used to transmit one signal or stream
  • the receive antenna means a physical or logical antenna used to receive one signal or stream.
  • the wireless communication system may be generally divided into a frequency division duplex (FDD) type and a time division duplex (TDD) type.
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are achieved while occupying different frequency bands.
  • the uplink transmission and the downlink transmission are achieved at different time while occupying the same frequency band.
  • a channel response of the TDD type is substantially reciprocal. This means that a downlink channel response and an uplink channel response are approximately the same as each other in a given frequency area. Accordingly, in the TDD based wireless communication system, the downlink channel response may be acquired from the uplink channel response.
  • the downlink transmission by the base station and the uplink transmission by the terminal may not be performed simultaneously.
  • the uplink transmission and the downlink transmission are performed in different subframes.
  • FIG. 2 Shows a Downlink Radio Frame Structure in 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE).
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • the radio frame is composed of ten subframes, and one subframe is composed of two slots.
  • the slots in the radio frame are designated by slot numbers from 0 to 19.
  • the time at which one subframe is transmitted is referred to as a transmission time interval (TTI).
  • TTI may be called as a scheduling unit for data transmission.
  • the length of one radio frame may be 10 ms
  • the length of one subframe may be 1 ms
  • the length of one slot may be 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, etc. may be variously modified.
  • one slot includes plural OFDM symbols for example, the number of OFDM symbols included in one slot may vary depending on a length of a cyclic prefix (CP).
  • CP cyclic prefix
  • FIG. 3 Shows a Downlink Radio Frame Structure According to TDD in 3GPP LTE.
  • the section 4 for TDD of 3GPP TS 36.211 V8.7.0 (2009-05) “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)” may be incorporated herein.
  • a radio frame includes 10 subframes indexed with 0 to 9.
  • One subframe includes 2 consecutive slots.
  • a time required for transmitting one subframe is defined as a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 millisecond (ms), and one slot may have a length of 0.5 ms.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain.
  • OFDM orthogonal frequency division multiplexing
  • the OFDM symbol is only for expressing one symbol period in the time domain, and there is no limitation in a multiple access scheme or terminologies.
  • the OFDM symbol may also be referred to as another terminology such as a single carrier frequency division multiple access (SC-FDMA) symbol, a symbol period, etc.
  • SC-FDMA single carrier frequency division multiple access
  • one slot includes 7 OFDM symbols for example, the number of OFDM symbols included in one slot may vary depending on a length of a cyclic prefix (CP).
  • CP cyclic prefix
  • a resource block is a resource allocation unit, and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in a time domain and the RB includes 12 subcarriers in a frequency domain, one RB can include 7 ⁇ 12 resource elements (REs).
  • REs resource elements
  • a subframe having an index #1 and an index #6 is called a special subframe, and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • the DwPTS is used in the UE for initial cell search, synchronization, or channel estimation.
  • the UpPTS is used in the BS for channel estimation and uplink transmission synchronization of the UE.
  • the GP is a period for removing interference which occurs in an uplink due to a multi-path delay of a downlink signal between the uplink and a downlink.
  • DL subframe In TDD, a downlink (DL) subframe and an uplink (UL) subframe co-exist in one radio frame.
  • Table 1 shows an example of a configuration of the radio frame.
  • ‘D’ denotes a DL subframe
  • ‘U’ denotes a UL subframe
  • ‘S’ denotes a special subframe.
  • a DL subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three preceding OFDM symbols of a 1st slot in the sub-frame. However, the number of OFDM symbols included in the control region may vary.
  • a physical downlink control channel (PDCCH) and other control channels are allocated to the control region, and a physical downlink shared channel (PDSCH) is allocated to the data region.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • FIG. 4 Illustrates an Example Resource Grid for One Uplink or Downlink Slot in 3GPP LTE.
  • the uplink slot includes a plurality of OFDM (orthogonal frequency division multiplexing) symbols in the time domain and NRB resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • the number of resource blocks (RBs), i.e., NRB may be one from 6 to 110.
  • one resource block includes 7 ⁇ 12 resource elements that consist of seven OFDM symbols in the time domain and 12 sub-carriers in the frequency domain.
  • the number of sub-carriers in the resource block and the number of OFDM symbols are not limited thereto.
  • the number of OFDM symbols in the resource block or the number of sub-carriers may be changed variously. In other words, the number of OFDM symbols may be varied depending on the above-described length of CP.
  • 3GPP LTE defines one slot as having seven OFDM symbols in the case of CP and six OFDM symbols in the case of extended CP.
  • OFDM symbol is to represent one symbol period, and depending on system, may also be denoted SC-FDMA symbol, OFDM symbol, or symbol period.
  • the resource block is a unit of resource allocation and includes a plurality of sub-carriers in the frequency domain.
  • the number of resource blocks included in the uplink slot, i.e., NUL, is dependent upon an uplink transmission bandwidth set in a cell.
  • Each element on the resource grid is denoted resource element.
  • the number of sub-carriers in one OFDM symbol may be one of 128, 256, 512, 1024, 1536, and 2048.
  • the resource grid for one uplink slot shown in FIG. 4 may also apply to the resource grid for the downlink slot.
  • FIG. 5 Illustrates the Architecture of a Downlink Sub-Frame.
  • the radio frame includes 10 sub-frames indexed 0 to 9.
  • One sub-frame includes two consecutive slots. Accordingly, the radio frame includes 20 slots.
  • the time taken for one sub-frame to be transmitted is denoted TTI (transmission time interval).
  • TTI transmission time interval
  • the length of one sub-frame may be 1 ms
  • the length of one slot may be 0.5 ms.
  • One slot may include a plurality of OFDM (orthogonal frequency division multiplexing) symbols in the time domain.
  • OFDM symbol is merely to represent one symbol period in the time domain since 3GPP LTE adopts OFDMA (orthogonal frequency division multiple access) for downlink (DL), and the multiple access scheme or name is not limited thereto.
  • the OFDM symbol may be referred to as SC-FDMA (single carrier-frequency division multiple access) symbol or symbol period.
  • one slot includes seven OFDM symbols, by way of example.
  • the number of OFDM symbols included in one slot may vary depending on the length of CP (cyclic prefix). That is, as described above, according to 3GPP TS 36.211 V10.4.0, one slot includes seven OFDM symbols in the normal CP and six OFDM symbols in the extended CP.
  • Resource block is a unit for resource allocation and includes a plurality of sub-carriers in one slot. For example, if one slot includes seven OFDM symbols in the time domain and the resource block includes 12 sub-carriers in the frequency domain, one resource block may include 7 ⁇ 12 resource elements (REs).
  • REs resource elements
  • the DL (downlink) sub-frame is split into a control region and a data region in the time domain.
  • the control region includes up to first three OFDM symbols in the first slot of the sub-frame. However, the number of OFDM symbols included in the control region may be changed.
  • a PDCCH (physical downlink control channel) and other control channels are assigned to the control region, and a PDSCH is assigned to the data region.
  • the physical channels in 3GPP LTE may be classified into data channels such as PDSCH (physical downlink shared channel) and PUSCH (physical uplink shared channel) and control channels such as PDCCH (physical downlink control channel), PCFICH (physical control format indicator channel), PHICH (physical hybrid-ARQ indicator channel) and PUCCH (physical uplink control channel).
  • data channels such as PDSCH (physical downlink shared channel) and PUSCH (physical uplink shared channel)
  • control channels such as PDCCH (physical downlink control channel), PCFICH (physical control format indicator channel), PHICH (physical hybrid-ARQ indicator channel) and PUCCH (physical uplink control channel).
  • the PCFICH transmitted in the first OFDM symbol of the sub-frame carries CIF (control format indicator) regarding the number (i.e., size of the control region) of OFDM symbols used for transmission of control channels in the sub-frame.
  • the wireless device first receives the CIF on the PCFICH and then monitors the PDCCH.
  • the PCFICH is transmitted through a fixed PCFICH resource in the sub-frame without using blind decoding.
  • the PHICH carries an ACK (positive-acknowledgement)/NACK (negative-acknowledgement) signal for a UL HARQ (hybrid automatic repeat request).
  • the ACK/NACK signal for UL (uplink) data on the PUSCH transmitted by the wireless device is sent on the PHICH.
  • the PBCH (physical broadcast channel) is transmitted in the first four OFDM symbols in the second slot of the first sub-frame of the radio frame.
  • the PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is denoted MIB (master information block).
  • MIB master information block
  • SIB system information block
  • the PDCCH may carry activation of VoIP (voice over internet protocol) and a set of transmission power control commands for individual UEs in some UE group, resource allocation of an upper layer control message such as a random access response transmitted on the PDSCH, system information on DL-SCH, paging information on PCH, resource allocation information of UL-SCH (uplink shared channel), and resource allocation and transmission format of DL-SCH (downlink-shared channel).
  • a plurality of PDCCHs may be sent in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on one CCE (control channel element) or aggregation of some consecutive CCEs.
  • the CCE is a logical allocation unit used for providing a coding rate per radio channel's state to the PDCCH.
  • the CCE corresponds to a plurality of resource element groups. Depending on the relationship between the number of CCEs and coding rates provided by the CCEs, the format of the PDCCH and the possible number of PDCCHs are determined.
  • the control information transmitted through the PDCCH is denoted downlink control information (DCI).
  • DCI may include resource allocation of PDSCH (this is also referred to as DL (downlink) grant), resource allocation of PUSCH (this is also referred to as UL (uplink) grant), a set of transmission power control commands for individual UEs in some UE group, and/or activation of VoIP (Voice over Internet Protocol).
  • the base station determines a PDCCH format according to the DCI to be sent to the terminal and adds a CRC (cyclic redundancy check) to control information.
  • the CRC is masked with a unique identifier (RNTI; radio network temporary identifier) depending on the owner or purpose of the PDCCH.
  • RNTI unique identifier
  • the terminal's unique identifier such as C-RNTI (cell-RNTI)
  • a paging indicator for example, P-RNTI (paging-RNTI) may be masked to the CRC.
  • SI-RNTI system information-RNTI
  • RA-RNTI random access-RNTI
  • blind decoding is used for detecting a PDCCH.
  • the blind decoding is a scheme of identifying whether a PDCCH is its own control channel by demasking a desired identifier to the CRC (cyclic redundancy check) of a received PDCCH (this is referred to as candidate PDCCH) and checking a CRC error.
  • the base station determines a PDCCH format according to the DCI to be sent to the wireless device, then adds a CRC to the DCI, and masks a unique identifier (this is referred to as RNTI (radio network temporary identifier) to the CRC depending on the owner or purpose of the PDCCH.
  • RNTI radio network temporary identifier
  • the uplink channels include a PUSCH, a PUCCH, an SRS (Sounding Reference Signal), and a PRACH (physical random access channel).
  • FIG. 6 Illustrates the Architecture of an Uplink Sub-Frame in 3GPP LTE.
  • the uplink sub-frame may be separated into a control region and a data region in the frequency domain.
  • the control region is assigned a PUCCH (physical uplink control channel) for transmission of uplink control information.
  • the data region is assigned a PUSCH (physical uplink shared channel) for transmission of data (in some cases, control information may also be transmitted).
  • the PUCCH for one terminal is assigned in resource block (RB) pair in the sub-frame.
  • the resource blocks in the resource block pair take up different sub-carriers in each of the first and second slots.
  • the frequency occupied by the resource blocks in the resource block pair assigned to the PUCCH is varied with respect to a slot boundary. This is referred to as the RB pair assigned to the PUCCH having been frequency-hopped at the slot boundary.
  • the terminal may obtain a frequency diversity gain by transmitting uplink control information through different sub-carriers over time.
  • m is a location index that indicates a logical frequency domain location of a resource block pair assigned to the PUCCH in the sub-frame.
  • the uplink control information transmitted on the PUCCH includes an HARQ (hybrid automatic repeat request), an ACK (acknowledgement)/NACK (non-acknowledgement), a CQI (channel quality indicator) indicating a downlink channel state, and an SR (scheduling request) that is an uplink radio resource allocation request.
  • HARQ hybrid automatic repeat request
  • ACK acknowledgenowledgement
  • NACK non-acknowledgement
  • CQI channel quality indicator
  • SR scheduling request
  • the PUSCH is mapped with a UL-SCH that is a transport channel.
  • the uplink data transmitted on the PUSCH may be a transport block that is a data block for the UL-SCH transmitted for the TTI.
  • the transport block may be user information.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be data obtained by multiplexing the transport block for the UL-SCH and control information.
  • the control information multiplexed with the data may include a CQI, a PMI (precoding matrix indicator), an HARQ, and an RI (rank indicator).
  • the uplink data may consist only of control information.
  • FIG. 7 is a Block Diagram Illustrating the Radio Protocol Architecture.
  • the data plane is a protocol stack for user data transfer and the control plane is a protocol stack for control signal transfer.
  • the physical layer provides upper-layer with information transfer service by using the physical channel.
  • the physical layer is connected through transport channel unlike MAC (Medium Access Control) layer, the upper-layer.
  • Data is transferred through transport channel between MAC layer and physical layer.
  • the transport channels are classified according to how data is transferred with characteristics through radio interface.
  • Data is transferred between different physical layers, in other words, data is transferred through physical channel between the physical layers of the transmitter and receiver.
  • the physical channel can be modulated by OFDM (Orthogonal Frequency Division Multiplexing) method, and time and frequencies are used as wireless resources.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the functions of MAC layer include mapping between the logical channel and transport channel, and multiplexing/inverse-multiplexing to the transport block provided via physical channel onto the transport channel of MAC SDU (service data unit) belonging to the logical channel.
  • MAC layer provides service to RLC (Radio Link Control) layer through logical channel.
  • RLC layer Functions of RLC layer include concatenation, segmentation and reassembly of RLC SDUs.
  • TM transparent mode
  • UM Unacknowledged Mode
  • AM Acknowledged Mode
  • AM RLC provides error correction through ARQ (automatic repeat request).
  • Functions of PDCP (Packet Data Convergence Protocol) layer on user plane include transfer of user data, header compression and ciphering.
  • Functions of PDCP (Packet Data Convergence Protocol) layer on user plane include transfer of control plane data and ciphering/integrity protection.
  • RRC (Radio Resource Control) layer is only defined on control plane.
  • RRC layer performs the task of configuration of radio bearers, re-configuration and control of logical channel, transport channel and physical channel in relation to release.
  • RB means a logical path which is provided by the 1st layer (PHY layer) and 2nd layer (MAC layer, RLC layer and PDCP layer) to transfer data between the UE and network.
  • the process of configuring RB means that characteristics of radio protocol layer and channel are specified for providing specific service and specific parameters and operation methods are configured for each service.
  • RB is then divided into two types of SRB (Signaling RB) and DRB (Data RB).
  • SRB is used as a passage for transferring RRC message on the control plane
  • DRB is used as a passage for transferring user data on the user plane.
  • RRC connection RRC Connection
  • the UE When RRC connection (RRC Connection) is established between the RRC layer of the UE and RRC layer of E-UTRAN, the UE can be in RRC connected state, or otherwise in RRC idle state.
  • downlink transport channels which transfer data from network to the UE
  • BCH Broadcast Channel
  • downlink SCH Shared Channel
  • transfer can be performed through downlink SCH or through separate downlink MCH (Multicast Channel).
  • uplink transport channels which transfer data from the UE to network
  • RACH Random Access Channel
  • uplink SCH Shared Channel
  • BCCH Broadcast Control Channel
  • PCCH Paging Control Channel
  • CCCH Common Control Channel
  • MCCH Multicast Control Channel
  • MTCH Multicast Traffic Channel
  • the physical channel consists of multiple OFDM symbols in time domain and multiple sub-carrier in frequency domain.
  • a sub-frame consists of multiple OFDM Symbols in time domain.
  • the resource block is a unit of resource allocation and consists of multiple OFDM symbols and multiple sub-carriers.
  • each sub-frame can use specific sub-carriers of specific OFDM symbols (e.g., the 1st OFDM symbol) of corresponding sub-frame for PDCCH (Physical Downlink Control Channel) i.e. for L1/L2 control channel.
  • TTI Transmission Time Interval
  • the RRC state of the UE and the method of RRC connection will be described below.
  • RRC state means whether the RRC layer of the UE is logically connected with the RRC layer of E-UTRAN or not, and is called to be in RRC connection state when connection is established, or in RRC IDLE STATE when connection is not established.
  • the UE in RRC connection state can be identified by E-UTRAN since there exists RRC connection, and therefore effective control of the UE is possible.
  • the UE in RRC IDLE STATE cannot be identified by E-UTRAN, and is controlled by CN (core network) in the unit of Tracking Area which is larger unit of area than the cell. In other words, the UE in RRC IDLE STATE is only identified in the unit of large area and so should transit to RRC connection state to receive conventional mobile communication service such as voice and data.
  • the UE When a user first turns the UE on, the UE first searches appropriate cell and stays in corresponding cell in RRC IDLE STATE.
  • the UE in RRC IDLE STATE establishes RRC connection with E-UTRAN through RRC connection procedure when there needs RRC connection, and transit to RRC connection state.
  • the UE in RRC IDLE STATE needs RRC connection for various reasons such as the need for uplink data transfer to try to call by the user or, when paging message is received from E-UTRAN, transfer of response message.
  • NAS Non-Access Stratum
  • RRC Radio Resource Control
  • EMM-REGISTERED EPS Mobility Management-REGISTERED
  • EMM-DEREGISTERED EMM-DEREGISTERED
  • EMM-REGISTERED EPS Mobility Management-REGISTERED
  • EMM-DEREGISTERED EMM-DEREGISTERED
  • ECM EPS Connection Management
  • ECM-IDLE state ECM-CONNECTED
  • MME Mobility Management
  • ECM-IDLE state S1 connection with E-UTRAN
  • E-UTRAN ECM-CONNECTED
  • E-UTRAN does not have context information of the UE. Therefore, the UE in ECM-IDLE state performs the process related to mobility, e.g.
  • the UE When the UE is in ECM-CONNECTED state, however, the mobility of the UE is controlled by the command from the network. When the location of the UE in ECM-IDLE state is changed from what is known to the network, the UE notifies the network of its location through Tracking Area Update procedure.
  • System information includes basic information the UE should know for accessing the base station. Therefore, the UE should receive all the system information to access the base station, and have most recent system information. Since the system information is information that every UE in corresponding cell should know, the base station periodically transmits the system information.
  • the system information is divided into MIB (Master Information Block), SB (Scheduling Block) and SIB (System Information Block).
  • MIB enables the UE to recognize physical construction of corresponding cell such as bandwidth.
  • SB informs transfer information of SIB such as transfer period.
  • SIB is a set of relevant system information. For example, some SIBs only include information of neighboring cells, and other SIBs only include the information of uplink radio channel the UE uses.
  • a BS transmits a paging message in order to inform UE whether or not system information has been changed.
  • the paging message can include a system information change indicator.
  • UE receives a paging message according to paging discontinuous reception (DRX). If the paging message includes a system information change indicator, the UE receives system information that is transmitted through a BCCH, that is, a logical channel.
  • DRX paging discontinuous reception
  • Random access is described below. Random access is used for UE to obtain uplink synchronization with a BS or to have uplink radio resources allocated thereto. After being powered on, UE initially obtains downlink synchronization with a cell and receives system information. Furthermore, the UE obtains a set of available random access preambles and information about radio resources used to transmit random access preambles from the system information. The radio resources used to transmit random access preambles can be specified as a radio frame and/or a set of one or more subframes. The UE transmits random access preambles randomly selected from the set of random access preambles. The BS that has received the random access preambles sends a Timing Alignment (TA) value for uplink synchronization to the UE through a random access response. Accordingly, the UE obtains uplink synchronization.
  • TA Timing Alignment
  • the BS allocates a dedicated random access preamble to a specific UE, and the UE performs non-contention random access by using the corresponding random access preamble. That is, in the process of selecting the random access preamble, there may exist the contention based random access in which the UE uses by arbitrary selecting one among a specific set and the non-contention random access that uses the random access preamble allocated to the specific UE by the BS.
  • the non-contention random access may be used for the process of handover or in case of being requested by an order of BS.
  • FIG. 8 is a Diagram Showing a Contention-Based Random Access Method.
  • UE randomly selects one random access preamble from a set of random access preambles indicated by system information or a handover command. Furthermore, the UE selects radio resources through which the random access preamble can be transmitted and transmits the selected random access preamble (S 810 ).
  • the radio resources can be a specific subframe, which may be for selecting a physical random access channel (PRACH).
  • PRACH physical random access channel
  • the UE After transmitting the random access preamble, the UE attempts to receive a random access response within a random access response reception window indicated by the system information or the handover command and thus receives a random access response (S 820 ).
  • the random access response is transmitted in an MAC PDU format, and the MAC PDU can be transmitted through a Physical Downlink Shared Channel (PDSCH).
  • PDSCH Physical Downlink Shared Channel
  • a Physical Downlink Control Channel (PDCCH) is also transferred to the UE so that the UE may properly receive information transferred through the PDSCH. That is, the PDCCH includes information about the UE that receives the PDSCH, information about the frequency and time of radio resources of the PDSCH, and the transport format of the PDSCH, etc. If the UE successfully receives the PDCCH transferred thereto, the UE properly receives the random access response that is transmitted through the PDSCH based on the PDCCH information.
  • the random access response can include a random access preamble ID, an UL grant (uplink radio resources), a temporary Cell-Radio Network Temporary Identifier (C-RNTI), and a Time Alignment Command (TAC). Since one random access response can include random access response information for one or more pieces of UE, a random access preamble ID can be included in order to inform that an UL grant, a temporary C-RNTI, and a TAC included in the random access response are valid for what UE.
  • the random access preamble ID can be an ID of a random access preamble received by an eNode B.
  • the TAC can be included as information on which the UE coordinates uplink synchronization.
  • the random access response can be indicated by a random access ID on a PDCCH, that is, a Random Access-Radio Network Temporary Identifier (RA-RNTI).
  • RA-RNTI Random Access-Radio Network Temporary Identifier
  • the UE When the UE receives a random access response valid for the UE, the UE processes information included in the random access response and performs transmission scheduled for the eNode B (S 830 ). That is, the UE applies the TAC and stores a temporary C-RNTI. Furthermore, the UE transmits data stored in the buffer of the UE or newly generated data to the eNode B using an UL grant. In this case, the data needs to include information on which the UE can be identified. This is because the eNode B is unaware that what pieces of UE perform random access in a contention-based random access process. Thus, it is necessary to identify the UE for a subsequent contention resolution.
  • a method of including information capable of identifying UE includes two types of methods. If the UE has already had a valid cell ID allocated thereto in a corresponding cell before performing random access, the UE transmits its own cell ID through an UL grant. In contrast, if a valid cell ID has not been allocated to the UE prior to a random access process, the UE transmits data including its own unique ID (e.g., an S-TMSI or a random ID). In general, the unique ID is longer than a cell ID. If the UE has transmitted the data through the UL grant, the UE starts a timer for a contention resolution (contention resolution timer).
  • contention resolution contention resolution
  • the UE waits for an instruction from the eNode B for a contention resolution (S 840 ). That is, the UE attempts to receive a PDCCH in order to receive a specific message.
  • a contention resolution Two types of methods can be proposed as a method of receiving a PDCCH. If its own ID transmitted through the UL grant as described above is a cell ID, the UE can attempt to receive a PDCCH using its own cell ID. In this case, if the UE receives a PDCCH through its own cell ID before the contention resolution timer expires, the UE determines that the random access has been normally performed and terminates the random access.
  • the UE attempts to receive a PDCCH using a temporary C-RNTI included in the random access response. In this case, if the UE has received a PDCCH through a temporary cell ID before the contention resolution timer expires, the UE checks data transferred through a PDSCH indicated by the PDCCH. If its own unique ID is included in the data, the UE can determine that the random access has been normally performed and terminate the random access.
  • FIG. 9 is a Diagram Showing a Non-Contention-Based Random Access Method.
  • non-contention-based random access can be terminated when UE receives a random access response.
  • Non-contention-based random access can be initiated in response to handover and/or a request, such as a command from an eNode B. In the two cases, contention-based random access can be performed.
  • the UE receives a designated random access preamble without a contention possibility from an eNode B.
  • the allocation of the random access preamble may be performed in response to a handover command and a PDCCH command (S 910 ).
  • the UE After the random access preamble designated to the UE is allocated to the UE, the UE transmits the corresponding random access preamble to the eNode B (S 920 ).
  • the eNode B transmits a random access response to the UE as a response (S 930 ).
  • S 930 For a procedure related to the random access response, reference can be made to S 820 of FIG. 8 .
  • the reason why a contention is generated in performing random access is that the number of random access preambles is basically limited. That is, since an eNode B cannot assign UE-unique random access preambles to all pieces of UE, UE randomly selects one of common random access preambles and transmits the selected random access preamble. Accordingly, two or more pieces of UE may select the same random access preamble and transmit the selected random access preamble through the same radio resources (PRACH resources), but an eNode B determines the received random access preamble to be one random access preamble received from one piece of UE. For this reason, the eNode B transmits a random access response to UE and expects that the random access response will be received by one piece of UE.
  • PRACH resources radio resources
  • the two or more pieces of UE receive the one random access response, and thus each of the pieces of UE performs an operation according to the reception of the random access response. That is, there is a problem in that the two or more pieces of UE transmit different data through the same radio resources using one UL grant included in the random access response. As a result, the transmission of the data may all fail, and the eNode B may receive only the data of specific UE depending on the locations or transmission power of the pieces of UE. In the latter case, since all the two or more pieces of UE assume that the transmission of their own data has been successful, the eNode B needs to inform pieces of UE that have failed in the contention of information about the failure. That is, to inform information about the failure or success of a contention is called a contention resolution.
  • a contention resolution method includes two types of methods.
  • One method includes a method using a contention resolution timer (hereinafter called a CR timer), and the other method is a method of transmitting an ID of successful UE to pieces of UE.
  • the earlier case is used when UE already has a unique cell ID (C-RNTI) prior to a random access process. That is, UE already having a cell ID transmits data, including its own cell ID, to an eNode B in response to a random access response, and actuates a CR timer. If PDCCH information including its own cell ID is received before the CR timer expires, the UE determines that it has been successful in a contention and normally terminates random access.
  • C-RNTI unique cell ID
  • the UE determines that it has failed in a contention and may perform a random access process again or inform a higher layer of the failure fact. From among the contention resolution methods, the latter case, that is, a method of transmitting an ID of UE, is used when UE does not have a unique cell ID prior to a random access process. That is, if UE does not have its own cell ID, the UE transmits data, including an ID (S-TMSI or random ID) higher than a cell ID, based on UL grant information included in a random access response and actuates a CR timer.
  • S-TMSI or random ID an ID
  • the UE determines that a random access process has been successful. In contrast, if the UE has not received data including its own higher ID through a DL-SCH before the CR timer expires, the UE determines that a random access process has failed.
  • FIG. 10 is a Diagram Showing the Structure of a Random Access Preamble.
  • the random access preamble includes a cyclic prefix (CP) 510 and a preamble sequence 1020 .
  • the length of the cyclic prefix can be represented as TCP, and the length of the preamble sequence can be represented as TSEQ.
  • the random access preamble may have a different format depending on a frame structure and a random access configuration. For this, reference can be made to Table 2 below. In Table 2, Ts indicates a basic time unit.
  • the transmission of random access preamble is limited to a specific time and frequency resource.
  • a resource is listed in ascending order in physical resource block in subframe number and frequency domain of a radio frame.
  • preamble format 0 to 3 for example, in the frame structure according to FDD depicted in FIG. 2 , a random access resource per a subframe may be existed.
  • Table 3 below represents the subframe in which the random access preamble permitted for given configuration in the frame structure according to FDD is permitted.
  • the random access preamble may be defined by a Zadoff-Chu (ZC) sequence as follows.
  • k denotes a root index
  • the available UL radio resource for random access may be specified according to a preamble format, a system frame number and a subframe number, and the specified UL radio resource may be indexed by the PRACH configuration index.
  • the preamble format is configured as a value that indicates five sort of random access preamble formats described above with reference to Table 2.
  • the preamble format may have a value of 0 to 3.
  • the preamble format may be determined according to cell environment, network state, etc.
  • Preamble format 0 may be used for normal environment.
  • Preamble format 1 may be used for the case in which time retard is significant such as the cell environment of big radius.
  • Preamble format 2 is for the case of sending sequence repeatedly in considering the situation in which signal to interference noise ratio (SINR) is low, and may be used for the case in which cell radius is within 30 km.
  • SINR signal to interference noise ratio
  • Preamble format 3 is for the case of sending sequence repeatedly in considering the situation in which SINR is low, and may be used for the case in which cell radius is within 100 km.
  • the system frame number may be configured as a value for specifying a radio frame that may be used as the PRACH which is a radio resource for random access among the above described radio frames.
  • the system frame number may be configured to indicate that any radio frames may be used for random access and/or a radio frame having a specific index such as even numbers may be used for random access.
  • the subframe number may be configured to indicate an index number of the subframe which may be used for random access within a radio frame.
  • the number of subframe that can be used as the PRACH for random access within a radio frame may be one or more.
  • An available subframe for transmitting random access preamble may be allocated to a UE through the UL radio resource information which is included in the system information and the UE may verify it. For example, when the UE receives an available UL radio resource information which is configured to indicate ‘8’ as a PRACH configuration index, the UE may identify that the random access preamble may be transmitted through number ‘3’ and ‘8’ of all radio frames. In this case, number ‘0’ format may be used as the preamble format.
  • the PRACH operation is performed for the purposed of initial access, handover, or UL synchronization of a terminal, that is, a UE.
  • a terminal that is, a UE.
  • Each PRACH preamble format is designed for the purpose of the various coverage radii of cells which are different from each other and the maximum delay spread, and an eNodeB may select a PRACH preamble format according to a state of cell and a wireless communication environment.
  • cell coverage radii of preamble formats 0 to 3 are 14 km, 77 km, 29 km and 100 km, the preamble sequence is designed to support them.
  • the existing PRACH preambles 0 to 3 have overhead which is more than needed.
  • PRACH preamble format 4 since cell coverage is designed to support 1.4 km, it seems to be proper as the PRACH preamble for pico cell.
  • the PRACH resource which is available to transmit the PRACH and is restricted only for TDD is also limited to a special subframe of which number of OFDM symbol is 2 that corresponds to UpPts.
  • a new format of PRACH preamble is suggested, and further, a method for allocating resources for the new format of PRACH is also suggested.
  • the new format of PRACH preamble suggested in the present specification may be generated based on the existing PRACH preamble format 4 or generated in entirely new form. First, the generation of new PRACH preamble will be described based on the existing PRACH preamble format 4.
  • the existing PRACH preamble format 4 may be transmitted in a special subframe of which number of OFDM symbol that corresponds to UpPts in TDD are 2.
  • a guard time (GT) is basically designed to support cell coverage of 1.4 km
  • a CP length is designed to support propagation delay for cell coverage radius of 1.4 km and delay spread of 5.4 ⁇ s. That is, a length of preamble according to existing PRACH preamble format 4 is 4832 T s including GT, which is designed to be shorter than 3 OFDM symbols based on normal CP and shorter than total length of 2 OFDM symbols based on extended CP.
  • PRACH preamble format 4 since PRACH preamble format 4 has short sequence length and small resource occupied basically, according to an embodiment suggested by the present specification, a new format of PRACH preamble is generated based on such PRACH preamble format 4.
  • a new format of PRACH preamble for a pico cell that has very small coverage of which needs has been growing recently may be generated.
  • the new format of PRACH preamble may allocate resources such that it may also be transmitted in a normal subframe as well as in a special subframe in case of TDD, and may also be used in case of FDD.
  • total number of UL subframes which are required for a plurality of PRACH preambles may be decreased by a plurality of the new format of PRACH formats in a subframe being transmitted.
  • the PRACH preamble may be transmitted with being tuned on synchronization of DL.
  • a resource for the PRACH preamble is required to be aligned with a specific reference point. That is, as such, in order to transmit a plurality of PRACH preambles in a subframe, synchronization of subframes, slots, or the unit of symbols may be required.
  • FIGS. 11a Through 11d are an Exemplary View Illustrating a Structure of a New PRACH Preamble According to an Embodiment Suggested in the Present Specification.
  • the new PRACH preamble format as depicted in FIGS. 11a through 11d may be defined based on the existing PRACH preamble format 4.
  • a resource for the new format of PRACH preamble may be aligned with boundaries of both sides of subframe, and accordingly, 2 PRACH preambles of new format may be transmitted in a subframe.
  • the resource for a first PRACH preamble of new format may be aligned such that it is started from a point where the subframe is started.
  • an end point of the resource for a second PRACH preamble of new format may be aligned with a point where the subframe is ended. That is, the resource for the second PRACH preamble of new format may be aligned such that is started from a region forgoing as much as a PRACH preamble length including GT from a point where the corresponding subframe is ended.
  • the PRACH preamble length of new format may be 4832 T s based on PRACH preamble format 4 in case of calculating it with including GT.
  • the resource for the new format of PRACH preamble may be aligned based on both boundaries of a slot.
  • 4 resources may be existed for the new format of PRACH preamble that may be timely existed in a subframe.
  • a first resource and a second resource (depicted as resource #0 and resource #1) may be aligned to be started from a point where each slot is started in the corresponding subframe, and end points of a third and a fourth resources (depicted as resource #2 and resource #3) may be aligned to be identical to the point where each slot is ended in the corresponding subframe.
  • the third and the fourth resources are aligned to be started from a region forgoing as much as the PRACH preamble length including GT from a point where the corresponding slot is ended, and therefore, the end point of resource may be aligned with a point where each slot is ended.
  • the length of new format of PRACH preamble may be 4832 T s based on PRACH preamble format 4 when it is calculated with including GT.
  • An index of resource depicted in FIG. 11b is just an example, but sequential mapping of the resources may be differently configured.
  • the resource for the new format of PRACH preamble may be aligned based on a bunch of symbols.
  • a number of symbols included in each slot may be changed depending on a type of CP.
  • the type of CP may be estimated by a second system information block (SIB2).
  • SIB2 second system information block
  • 7 OFDM or SC-FDMA symbols may be included in a slot.
  • 3 OFDMA or SC-FDMA symbols are grouped, and a resource for the new format of PRACH preamble may be aligned with a boundary of each group.
  • each resource may be aligned with a boundary for the group which is comprised of first 3 symbols based on each slot and a boundary for the group which is comprised of 3 symbols.
  • a length of the new format of PRACH preamble may be shorter than a length of 3 symbols in case of normal CP, 4 resources may be existed for the new format of PRACH preamble in a subframe.
  • 6 symbols may be included in a slot, and in this case, 2 symbols may be grouped, and a resource for the PRACH preamble may be aligned with a boundary of each group.
  • a length of the new format of PRACH preamble may be shorter than a length of 2 symbols in case of extended CP, and 6 resources may be existed for the new format of PRACH preamble in a subframe.
  • the resources for the new format of PRACH preamble in a subframe are aligned with a subframe boundary, a slot boundary, or a boundary of a group of symbol, and a predetermined number of resource are included.
  • a UE may determine a parameter for the number of PRACH, for example, the number of resources that may be existed in a subframe based on N PRACH .
  • the parameter for the number of PRACH i.e., N PRACH may be pre-designated by the UE or a higher layer, i.e., RRC layer.
  • pre-designating N PRACH based on total length (including GT) of the PRACH preamble, there may be a case that a number that may fill in a subframe in the maximum is designated to N PRACH .
  • the starting location of resource for the new format of PRACH preamble may be determined as multiple of an integer of total length of the PRACH preamble including GT at the location where the corresponding subframe is ended, and summation of a number of guard sample which is used.
  • total summation of the gourd samples may be configured such that the summation of total samples for the resource for the new format of PRACH preamble and total sum of gourd samples is the same or fewer than the number of samples that correspond to a subframe.
  • a UE may determine a number of resources that may be existed in a slot according to the parameter N PRACH , for the number of the new format of PRACH.
  • the slot in which the resources for the new format of PRACH preamble may be included may be pre-designated for designated through a higher layer.
  • the starting location of resources for the new format of PRACH preamble is configured as multiple of an integer of total length the PRACH preamble including GT at the location where the corresponding slot is ended, and summation of a number of guard sample which is used.
  • the resource for the new format of PRACH preamble is 4832 T s based on the conventional 3GPP release-10, but may be changed, like the length of CP and GT may be changed according to the cell coverage radius and the maximum delay spread. Also, the number of resource described so far is just an example, but the number of resource may be configured more than the above examples according to the length (including GT) of the new format of PRACH preamble.
  • a space of subcarrier for the PRACH may be smaller than the existing 7.5 kHz.
  • FDM may be additionally used. In configuring the resource for the PRACH preamble, the case of using FDM only may be considered.
  • the matters that can be considered for new PRACH preamble format includes overhead and interference between the PRACH and the PUCCH/PUSCH.
  • the transmission power of the PRACH may be configured to be significantly lower in comparison with that of the PUSCH, the interference degree that the PRACH of a UE influences on the PUSCH of another UE may be low.
  • significant interference may influence if the PRACH of a UE uses the same resource of the PUSCH of another UE.
  • the PRACH preamble length (including GT) to be within 1 symbol section.
  • the length of PRACH preamble may also be differently configured.
  • the resource for PRACH preamble may be aligned to be started from a region forgoing as much as the PRACH preamble length including GT from a point where the corresponding subframe is ended.
  • the resource for PRACH preamble may be configured to be existed within a region that corresponds to the last symbol of the corresponding subframe.
  • the PRACH BW that occupied 6 RB based on the PUSCH in the conventional 3GPP release-10 may be adjusted to 2 RB or 3 RB. According to this, ZC sequence for generating sequence of the PRACH preamble can also be improved.
  • a UE since such a PRACH preamble may collide with the PUCCH or the PUSCH, a UE should be able to operate for avoiding collision based on the resource for the new PRACH preamble.
  • the UE In case that collision between the PRACH preamble and the PUCCH/PUSCH occurs in a UE, the UE is allowed to use shortened PUCCH/PUSCH in order to fix this, and in case that simultaneous transmission of the PRACH and the PUCCH/PUSCH is configured, the simultaneous transmission may be performed with the PRACH by using the shortened PUCCH/PUSCH.
  • a part of the information is dropped.
  • the PRACH preamble transmitted by a UE and the PUCCH/PUSCH transmitted by another UE may collide.
  • the UE may use the shortened PUCCH/PUSCH.
  • the PRACH based on grant collides with the PUCCH/PUSCH, the UE may use the shortened PUCCH/PUSCH.
  • the PRACH based on grant may be limited to the PRACH transmission by the PDCCH.
  • the standard of which the PRACH is transmitted may be extended to a unit of slot, not a unit of symbol.
  • the PUCCH/PUSCH configuration scheme may be changed to be based on slot.
  • a UE may transmit the PRACH preamble through a part of region of DL subframe where UE-common such as CRS/CSI-RS or cell-specific RS is not transmitted.
  • the part of region of the corresponding DL subframe may include the remainder region (a region where there is no MBSFN signal transmission) except a partial (1-2) symbol which is front part of the DL subframe which is configured to be MBSFN subframe.
  • a DL subframe (or a special subframe) in which the CRS/CSI-RS and RS for tracking are not configured to be transmitted may be included.
  • a region of DL subframe in which the PRACH preamble may be transmitted may be limited to a region that corresponds to OFDM symbols which are fewer than the symbols indicated by the signal I DataStrat of a higher layer that indicates to a number of PDCCH OFDM symbol. The reason of such limitation is because the PDCCH may not transmitted in the corresponding region in order to decrease or eliminate interference in the PDCCH region of the existing carrier by the NCT.
  • a region region also including UpPTS
  • a part of symbol in front part in DwPTS of a special subframe may also be included in DL region which is available to configure the corresponding PRACH (although the CRS may be included, but by omitting the PDSCH scheduling for all UEs).
  • next system does not allow for an access of the existing UE for the cell of which needs has been growing recently, a resource and a configuration for the new format of PRACH preamble may be freely performed.
  • the existing format of PRACH preamble and the new format of PRACH preamble should be operated together in order to allow an access of the existing UE, an additional procedure is required.
  • the configuration and prach-FrequencyOffset n PRBoffset RA of a UE for the PRACH preamble are indicated in cell-specific manner, and through this, an eNodeB was able to allocate a resource for the PRACH preamble to the UE.
  • two or more configurations of UE for the PRACH preamble and PRB offsets are to be included. That is, each cell may support all of the configurations for the PRACH preamble of the format based on the existing release-10 and the configurations for the PRACH preamble of new format.
  • the configurations of UE for the PRACH preamble and PRB offset for the new format of PRACH preamble may be extended for the object that the UE may perform a specialized access and the object except for the UL synchronization tracking use and communication between eNodeB and UE for the cell of which needs has been growing recently.
  • the configuration which is additionally instructed to a UE is not overlapped with that of the existing PRACH preamble format, and is set for the configuration that corresponds to new PRACH preamble format in the next system.
  • a UE is signaled to use the subset of a part which is not currently used among the PRACH preamble configuration indices for each of FDD and TDD.
  • FDD a UE is signaled by using configuration index 30, 46, 60, 61 and 62 shown in Table 3.
  • TDD a UE is signaled by using configuration index 58, 59, 60, 61, 62 and 63.
  • the configuration for the new PRACH preamble format may be signaled to a UE through a separate table.
  • the configuration for the PRACH preamble may represent the resources for the PRACH preamble in which the PRACH preamble may be transmitted (for example, location/timing where/when the PRACH preamble is stared within the same subframe may be included).
  • an example of dynamic instructing is to use of instructing by the PDCCH.
  • FIGS. 12a and 12b Illustrates a Method for Notifying Configuration for the PRACH Preamble to a UE.
  • FIGS. 12a and 12b detailed example of the methods in which an eNodeB notifies two PRACH preamble configurations to a UE is shown.
  • 2 configurations for the PRACH preamble may be signaled to the UE through the system information that the eNodeB transmits. In this case, even if trying to perform initial access, the UE may select one of 2 configurations for the PRACH preamble and perform it.
  • the common channel may be PBCH, and the bits which are not currently used in the PBCH may be used as the flag bit.
  • a setting method for additional PRB offset may be set such that the resource for the PRACH preamble which is additional to the resource for the PRACH preamble for the existing UE is to be subset in order to minimize or eliminate increase of overhead for managing 2 configurations for the PRACH preamble by a cell.
  • the value of PRB offset for legacy UE and additional PRB offset may be identically configured in case that the resource has BW that corresponds to 6 RB based on the PDSCH.
  • RA-RNTI is used to distinguishing PRACH preambles.
  • the RA-RNTI distinguishes them based on the subframe to which the PRACH preamble is transmitted, as shown in FIG. 13 , in case that a plurality of the PRACH preamble of new format is transmitted on a subframe, an eNodeB may not distinguish from which UE each PRACH preamble is transmitted.
  • the existing RA-RNTI can be improved.
  • the improved RA-RNTI is calculated by additionally considering a resource index for the PRACH preamble in the same subframe in addition to the subframe index where the PRACH preamble is started and the index for the frequency domain. That is, possible values for the RA-RNTI may be extended from the existing 0001-0003C to 0001-FFF3.
  • RAR may be transmitted through the PDSCHs different from each other.
  • RA-RNTI is generated based on the conventional 3GPP release-10, but an eNodeB distinguishes UEs by using the reserved field that comprises the (e ⁇ ) PDCCH for MSG2.
  • the reserved field may be corresponds to HARQ process or DAI based on 3GPP release-10.
  • the resource index for the PRACH preamble in the same subframe may be used.
  • RAR may be transmitted through the PDSCHs different from each other.
  • RA-RNTI is generated based on the conventional 3GPP release-10, and also in case that the RAR may be transmitted through the same PDSCH, the UEs that transmit respective PRACH preambles may be distinguished by higher layer in the same subframe.
  • the higher layer may be MAC layer.
  • MAC layer may distinguish them by using a predefined pattern among RAR bundle for the resource for each PRACH preamble, and may add a field for distinguishing resources for the PRACH preamble in each subheader.
  • RA-RNTI is generated based on the existing Release-10
  • the PDCCH candidate is differently configured within common search space (CSS) to which the PDCCH that corresponds to RAR is transmitted, according to the resource for the PRACH preamble.
  • SCS common search space
  • each PDCCH that corresponds to RAR may be mapped to the respective 4 PDCCH candidates of which aggregation level is 4 (in CSS), and reversely, the UE estimates the resource for the PRACH preamble which is used for transmitting the PRACH preamble through the CSS (according to through which PDCCH candidate PAR is scheduled in the corresponding SS).
  • RAR may be transmitted through the PDSCH different from each other.
  • each PDSCH may be transmitted through different subframes.
  • the resources for the PRACH preamble that corresponds to 2 configurations may be allocated such that overlapped section occurs.
  • the resources for the new format of PRACH preamble may be allocated as subset with respect to the resource for the PRACH preamble that corresponds to the existing configuration.
  • the subframe or slot that corresponds to the resource for the new format of PRACH preamble may be allocated to be overlapped from the last subframe among a bundle of subframes that corresponds to the resource for the existing format of PRACH preamble. The reason for such allocation is to increase an overlapped part with GT that corresponds to the resource for the existing format of PRACH preamble in the resource for the new format of PRACH preamble.
  • the existing PRACH preamble format 3 it may be configured that a bundle of subframes that corresponding to the resource for the PRACH preamble is comprised of 3 subframes, and the resource for the new format of PRACH preamble is overlapped from a third subframe in the bundle.
  • each cell has a plurality of configurations for the PRACH preamble, or has one configuration for the PRACH preamble like the conventional release-10. According to situation or object, the plurality of configurations for the PRACH preamble may be used together.
  • a higher layer of eNodeB notifies a configuration for the PRACH preamble which is usable among subframe or a bundle of subframes. That is, the higher layer of eNodeB notifies a plurality of configurations for the PRACH preamble, and each configuration may be used in a specific subframe or a specific bundle of subframes.
  • a UE preferentially selects the configuration that corresponds to the new format of PRACH preamble among the plurality of configurations for the PRACH preamble.
  • the configuration for the PRACH preamble that a UE will use is known to the UE by an instruction of the PDCCH. For example, by using a reserved field of the PDCCH as a flag bit, the configuration may be notified to the UE.
  • the reserved bit may be a part of values configured as zero.
  • the UE preferentially selects the configuration that corresponds to the new format of PRACH preamble.
  • FIG. 14 is a Block Diagram Showing a Wireless Communication System to Implement an Embodiment of the Present Invention.
  • the base station 200 a processor 201 , memory 202 , and an RF unit 203 .
  • the memory 202 is connected to the processor 201 and configured to store various information used for the operations for the processor 201 .
  • the RF unit 203 is connected to the processor 201 and configured to send and/or receive a radio signal.
  • the processor 201 implements the proposed functions, processed, and/or methods. In the described embodiments, the operation of the eNodeB may be implemented by the processor 201 .
  • a wireless device 100 includes a processor 101 , memory 102 , and a radio frequency (RF) unit 103 .
  • the memory 102 is connected to the processor 101 and configured to store various information used for the operations for the processor 101 .
  • the RF unit 103 is connected to the processor 101 and configured to send and/or receive a radio signal.
  • the processor 101 implements the proposed functions, processed, and/or methods. In the described embodiments, the operation of the wireless device may be implemented by the processor 101 .
  • the processor may include Application-Specific Integrated Circuits (ASICs), other chipsets, logic circuits, and/or data processors.
  • the memory may include Read-Only Memory (ROM), random access Memory (RAM), flash memory, memory cards, storage media and/or other storage devices.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described scheme may be implemented using a module (process or function) which performs the above function.
  • the module may be stored in the memory and executed by the processor.
  • the memory may be disposed to the processor internally or externally and connected to the processor using a variety of well-known means.

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US17/089,623 USRE49324E1 (en) 2012-06-27 2013-06-12 Method and terminal for random access to small cell
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