WO2012155693A1 - Procédé et dispositif de transmission sur un canal prach dans une agrégation de porteuses - Google Patents

Procédé et dispositif de transmission sur un canal prach dans une agrégation de porteuses Download PDF

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Publication number
WO2012155693A1
WO2012155693A1 PCT/CN2012/073126 CN2012073126W WO2012155693A1 WO 2012155693 A1 WO2012155693 A1 WO 2012155693A1 CN 2012073126 W CN2012073126 W CN 2012073126W WO 2012155693 A1 WO2012155693 A1 WO 2012155693A1
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WIPO (PCT)
Prior art keywords
serving cell
random access
control channel
downlink control
channel information
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PCT/CN2012/073126
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English (en)
Chinese (zh)
Inventor
吴欣
戴博
喻斌
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ZTE Corp
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ZTE Corp
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Classifications

    • 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
    • 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
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]

Definitions

  • a radio frame (Radio Frame, abbreviated as RF) in a Long Term Evolution (LTE) system includes a Frequency Division Duplex (FDD) mode and a Time Division Duplex (Time Division Duplex).
  • FDD Frequency Division Duplex
  • Time Division Duplex Time Division Duplex
  • TDD Time Division Duplex
  • 1 is a schematic diagram of a frame structure of an FDD mode in the prior art. As shown in FIG. 1, a 10 ms (millisecond) radio frame is composed of twenty slots (time slots) of length 0.5 ms and numbers 0-19.
  • the slots 2i and 2i+1 form a subframe i having a length of 1 ms.
  • 2 is a schematic diagram of a frame structure of a TDD mode in the prior art. As shown in FIG. 2, a 10 ms radio frame is composed of two half frames of 5 ms length, and one field includes five lengths of 1 ms. Subframe, subframe i is defined as two slots 2i and 2i+1 that are 0.5 ms long. In the above two frame structures, for a Normal Cyclic Prefix (Normal CP), one slot contains seven symbols of length 66.7us (microseconds), wherein the CP length of the first symbol is 5.21us. The length of the remaining 6 symbols is 4.69us.
  • Normal Cyclic Prefix Normal CP
  • Random access is the access process of the user equipment (User Equipment, UE for short) before starting communication with the network.
  • the process of random access can be divided into two types: a random access procedure for competition and a non-contention random access procedure.
  • the contention random access procedure refers to the UE randomly selecting a sequence in the public random access sequence available in the cell to be transmitted in a competitive manner, so there is a possibility of collision collision, and collision processing is required; a non-competitive random access procedure It means that the base station directly allocates a random access sequence to the UE, and the sequence is not in the cell common random access sequence set, so there is no possibility of collision.
  • the Physical Random Access Channel (referred to as the Physical Random Access Channel in the LTE system)
  • PRACH also known as Random Access Opportunity or Random Access Resource
  • Random Access Preamble a random access channel corresponding to a random access preamble (Random) Access Preamble
  • the random access preamble consists of a Cyclic Prefix (CP) and a Sequence.
  • CP Cyclic Prefix
  • Sequence a random access preamble format
  • Preamble Format mean different CP and/or sequence lengths.
  • Table 1 the types of preamble formats supported by the TDD mode in the LTE system are as shown in Table 1 below.
  • preamble format 0 is transmitted in a normal uplink subframe
  • preamble format 4 is transmitted in the uplink pilot time slot (Uplink Pilot Time Slot, referred to as UpPTS).
  • the specific transmission mode is as follows: preamble format 0 is transmitted in a normal uplink subframe; preamble format 1 and 2 are transmitted in two normal uplink subframes; preamble format 3 is transmitted in three normal uplink subframes; preamble format 4 is in UpPTS Internal transfer.
  • a random access preamble occupies a bandwidth corresponding to a resource block (Resource Block, RB for short), that is, 72 resource elements (Resource Element, referred to as RE), and each RE has a bandwidth of 15 kHz.
  • the PRACH channels with the same time domain location are distinguished by the frequency domain.
  • the following three types of downlink physical control channels are defined in LTE: Physical Control Format Indicator Channel (PCFICH) and Physical Hybrid Automatic Retransmission Request Indicator Channel (PHICH). ), Physical Downlink Control Channel (PDCCH).
  • the PDCCH is used to carry downlink control channel information (Downlink Control Information, DCI for short), and includes: uplink and downlink scheduling information, and uplink power control information.
  • DCI format (DCI format) is divided into The following are the following: DCI format 0, DCI format 1, DCI format 1A, DCI format 1B, DCI format 1C, DCI format 1D, DCI format 2, DCI format 2A, DCI format 3, and DCI format 3A. Where :
  • the DCI format 0 is used to indicate the scheduling of the Physical Uplink Shared Channel (PUSCH);
  • DCI format 1, DCI format 1A, DCI format 1B, DCI format 1C, and DCI format ID are used in different modes of code downlink scheduling of a Physical Downlink Shared Channel (PDSCH);
  • PDSCH Physical Downlink Shared Channel
  • DCI format 2 DCI format 2A, DCI format 2B is used for different modes of space division multiplexing;
  • DCI format 3 is used for physical uplink control channel (Physical Uplink Control)
  • PUCCH Physical Uplink Control Channel
  • the physical resources of the PDCCH are transmitted in units of Control Channel Elements (CCEs).
  • CCEs Control Channel Elements
  • the size of one CCE is 9 Resource Element Groups (REGs), that is, 36 REs.
  • RAGs Resource Element Groups
  • One PDCCH may occupy. 1, 2, 4 or 8 CCEs.
  • a tree-like aggregation (Aggregation) is adopted, that is, a PDCCH occupying one CCE can start from an arbitrary CCE position; a PDCCH occupying two CCEs from an even CCE The position starts; the PDCCH occupying 4 CCEs starts from the CCE position which is an integral multiple of 4; the PDCCH occupying 8 CCEs starts from the CCE position which is an integral multiple of 8.
  • Each Aggregation level defines a search space, including a common search space and a UE-specific search space.
  • the number of CCEs in the entire search space is determined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols and the number of PHICH groups occupied by the control region indicated by the PCFICH in each downlink subframe.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the UE blindly detects all possible PDCCH code rates in the search space according to the DCI format of the transmission mode.
  • the base station sends information such as a Preamble Index and a PRACH Mask Index through the DCI format 1 A.
  • the UE is configured by the upper layer to perform PDCCH decoding using a Random Access Radio Network Temporary Identifier (RA-RNTI) scrambled Cyclic Redundancy Check (CRC),
  • RA-RNTI Random Access Radio Network Temporary Identifier
  • CRC Cyclic Redundancy Check
  • the UE shall then decode the PDCCH and all associated PDSCHs according to the respective combinations defined in Table 2 below.
  • the UE shall decode the PDCCH according to the corresponding combination defined in Table 3 below. All relevant PDSCH.
  • C-RNTI Cell Radio Network Temporary Identifier
  • DCI format 1 A uses a single antenna port, port 0, otherwise the defined UE specific
  • UE specific port 7 and 8
  • DCI format 1 A uses a single antenna port, port 0, otherwise the defined UE specific
  • LTE-Advanced LTE-Advanced
  • CC Component Carrier
  • CA Carrier Aggregation
  • n component carriers for the aggregated spectrum, it is divided into n component carriers (spectrum), and the spectrum in each component carrier (spectrum) is continuous.
  • a schematic diagram of carrier aggregation in the LTE-A system is shown in FIG.
  • PCC primary component carrier
  • SCC Secondary Component Carrier
  • the component carrier may also be referred to as a serving cell (Serving Cell), and the primary component carrier may be referred to as a primary serving cell (Primary Serving Cell, referred to as Pcell), and the secondary component carrier may be referred to as a secondary serving cell (Secondary Serving) Cell, referred to as Scell).
  • a physical random access channel can only be transmitted on the primary serving cell.
  • RRHs remote radio heads
  • Repeaters Repeater
  • a PRACH transmission method in carrier aggregation includes: a UE transmitting a PRACH on a secondary serving cell; and a UE receiving a random access procedure message 2 sent by a base station on a secondary serving cell.
  • the PRACH transmission method in the foregoing carrier aggregation further includes: after receiving the random access procedure message 2, the UE is on the secondary serving cell.
  • the UE sends a random access procedure message 3 to the base station; the UE receives the random access procedure message 4 sent by the base station through the secondary serving cell.
  • the step of the UE transmitting the PRACH on the secondary serving cell includes: the UE receiving the random access trigger message sent by the base station, triggering the UE to randomly select the random access preamble sequence, or the UE does not need the random access trigger message, and randomly selects Random access preamble sequence; the UE transmits the PRACH on the secondary serving cell according to the selected random access preamble sequence.
  • the UE receives the random access procedure message sent by the base station only on the secondary serving cell that transmits the PRACH.
  • the random access trigger message is sent by the base station to the UE through the high layer signaling of the primary serving cell or the downlink control channel information of the primary serving cell, or the downlink control channel information of the secondary serving cell.
  • the high-level signaling of the primary serving cell or the downlink control channel information of the primary serving cell includes an uplink serving cell index where the PRACH is located.
  • the uplink serving cell index where the PRACH is located is located in the CIF added in the downlink control channel information of the primary serving cell; or in the downlink control signaling in the downlink control channel information of the primary serving cell.
  • the downlink control channel information of the primary serving cell further includes: a preamble index and a PRACH mask index.
  • the transmitting, by the UE, the PARCH on the secondary serving cell according to the selected random access preamble sequence includes:
  • the UE transmits the PRACH on the serving cell indicated by the uplink serving cell index where the PRACH is located.
  • the UE transmitting the PRACH on the secondary serving cell includes: the downlink secondary serving cell that the UE receives the random access trigger message
  • the PRACH is sent on the uplink serving cell of the system message SIBX link.
  • SIBX system message
  • the secondary serving cell that the base station sends the random access procedure message 2 is the downlink serving cell corresponding to the uplink serving cell that sends the PRACH, and the base station sends the random access procedure message only on the downlink serving cell corresponding to the uplink serving cell that sends the PRACH.
  • the step of the UE receiving the random access procedure message 2 sent by the base station on the secondary serving cell includes: detecting, by the UE, the downlink control channel information sent by the base station on the secondary serving cell that sends the PRACH; the UE is in the secondary serving cell that sends the PRACH The random access procedure message 2 is detected according to the downlink control channel information and the preamble index corresponding to the PRACH.
  • the step of detecting the downlink control channel information sent by the base station on the secondary serving cell that sends the PRACH includes: the UE detecting the base station according to the configured random access radio network temporary identifier RA-RNTI on the secondary serving cell that sends the PRACH Downlink control channel information sent.
  • the step of detecting, by the UE, the downlink control channel information sent by the base station according to the configured RA-RNTI on the secondary serving cell that sends the PRACH includes: the UE is on the secondary serving cell that sends the PRACH, according to the configured RA-RNTI, in one
  • the downlink control channel information of the public search space sent by the base station and the downlink control channel information of the user-specific search space are detected on the subframe; or the UE is in a subframe according to the configured RA-RNTI on the secondary serving cell that sends the PRACH. Only the downlink control channel information of the public search space is detected, and only the downlink control channel information of the private search space of the secondary serving cell is detected in another subframe.
  • the receiving, by the UE, the random access procedure message 4 sent by the base station by using the secondary serving cell includes: downlink control channel information detected by the UE according to the primary serving cell, or downlink control detected according to the secondary serving cell
  • the channel information detects a random access procedure message 4 transmitted by the base station through the secondary serving cell.
  • the detecting, by the UE, the downlink control channel information on the primary serving cell comprises: detecting, by the UE, the downlink control channel information sent by the base station according to the temporary cell radio network temporary identifier or the cell radio network temporary identifier on the primary serving cell.
  • the downlink control channel information detected by the UE on the primary serving cell includes a CIF, which is used to indicate a serving cell corresponding to the downlink control channel information.
  • the detecting, by the UE, the downlink control channel information on the secondary serving cell includes: detecting, by the UE on the secondary serving cell, the downlink control channel information sent by the base station according to the temporary cell wireless network temporary identifier or the cell wireless network temporary identifier.
  • a PRACH transmission apparatus in a carrier aggregation in a mobile terminal, where the apparatus includes: a transmission module, configured to transmit a PRACH on a secondary serving cell; and a first receiving module, configured to The random access procedure message 2 sent by the base station is received on the secondary serving cell.
  • the PRACH transmission apparatus in the foregoing carrier aggregation further includes: a first sending module, configured to: after receiving the random access procedure message 2, send a random access procedure message 3 to the base station on the secondary serving cell; The module is configured to receive a random access procedure message 4 sent by the base station through the secondary serving cell.
  • the transmission module is configured to: after receiving the random access trigger message sent by the base station, trigger the PRACH transmission device to randomly select a random access preamble sequence, or randomly select a random access trigger message, and randomly select a random access preamble sequence;
  • the PRACH is transmitted on the secondary serving cell according to the selected random access preamble sequence.
  • the random access trigger message is sent by the base station to the mobile terminal through the high layer signaling of the primary serving cell or the downlink control channel information of the primary serving cell, or the downlink control channel information of the secondary serving cell.
  • the high layer signaling of the primary serving cell or the downlink control channel information of the primary serving cell includes
  • the information of the uplink serving cell index in which the PRACH is included in the downlink control channel information of the primary serving cell is set in the carrier indication field CIF added in the downlink control channel information, or is set in the downlink control channel information.
  • the downlink control signaling In the downlink control signaling.
  • the random access trigger message is sent by the base station, and after receiving the random access trigger message, the UE triggers a random access procedure, and selects a random access preamble sequence according to the random access trigger message, or the UE
  • the random access preamble sequence is randomly selected, and the PRACH is transmitted on the secondary serving cell according to the selected random access preamble sequence, and then the transmission and reception of the random access procedure messages 2, 3, and 4 are solved, and the prior art carrier is solved.
  • the PRACH cannot be transmitted on the secondary serving cell, especially the contention-based PRACH.
  • the PRACH is transmitted on the secondary serving cell.
  • FIG. 1 is a schematic diagram of a frame structure of an FDD mode according to the related art
  • FIG. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art
  • FIG. 1 is a schematic diagram of a frame structure of an FDD mode according to the related art
  • FIG. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art
  • FIG. 1 is a schematic diagram of a frame structure of an FDD mode according to the related art
  • FIG. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art
  • FIG. 1 is a schematic diagram of a frame structure of an FDD mode according to the related art
  • FIG. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art
  • FIG. 1 is a schematic diagram of a frame structure of an FDD mode according to the related art
  • FIG. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art
  • FIG. 3 is a schematic diagram of carrier aggregation of an LTE-A system according to the related art
  • 4 is a flow chart of steps of a PRACH transmission method in carrier aggregation according to Embodiment 1 of the present invention
  • FIG. 5 is a flowchart of steps of a PRACH transmission method in carrier aggregation according to Embodiment 2 of the present invention
  • FIG. 7 is a structural block diagram of a mobile terminal according to Embodiment 8 of the present invention.
  • Embodiment 1 Referring to FIG. 4, a step of a PRACH transmission method in carrier aggregation according to Embodiment 1 of the present invention is shown.
  • the PRACH transmission method in the carrier aggregation of this embodiment includes the following steps: Step S102: The UE sends a PRACH on the secondary serving cell.
  • the UE may randomly select a random access preamble sequence according to the received random access trigger message sent by the base station, or the UE does not need a random access trigger message, randomly selects a random access preamble sequence, and selects according to the random access preamble sequence.
  • the random access preamble sequence transmits the PRACH on the secondary serving cell.
  • the UE receives the random access trigger message sent by the base station, triggers the UE to enter the random access procedure, and selects a random access preamble sequence according to the random access trigger message.
  • the base station sends a random access trigger message to the UE through the primary serving cell, where the UE may carry information indicating the secondary serving cell that the UE sends the PRACH, and after receiving the trigger message, the UE according to the indication in the trigger message, correspondingly
  • the secondary serving cell sends a PRACH;
  • the base station sends a random access trigger message to the UE through the secondary serving cell, and the UE sends the station on the uplink serving cell of the downlink secondary serving cell SIBX link that receives the random access trigger message.
  • Said PRACH is Alternatively, in a case that the base station does not send the random access trigger message, the UE randomly selects a random access preamble sequence to trigger a random access procedure.
  • Step S104 The UE receives the random access procedure message 2 sent by the base station on the secondary serving cell.
  • the base station is fixed on the secondary serving cell to send a random access procedure message 2 (ie, Message 2 in the protocol).
  • the PRACH transmission method in the foregoing carrier aggregation further includes the following steps: Step S106: After receiving the random access procedure message 2, the UE sends a random access procedure message 3 to the base station on the secondary serving cell. .
  • the random access procedure message 3 is Message 3 in the protocol.
  • Step S108 The UE receives the random access procedure message 4 sent by the base station through the secondary serving cell.
  • the base station After receiving the random access procedure message 3 sent by the UE, the base station sends a random access procedure message 4 (ie, Message 4 in the protocol) to the UE.
  • the contention-based PRACH transmission on the secondary serving cell in the carrier aggregation scenario is implemented by the random access procedure messages 3 and 4, wherein the message 4 is scheduled by the message 3 in the process.
  • the process message 3 and the process message 4 may represent the downlink data and the uplink data after synchronization on the secondary serving cell, and there is no correlation between the message 3 and the message 4.
  • the PRACH cannot be transmitted on the secondary serving cell.
  • the random access triggering message is used to trigger the random access procedure, and the random access preamble sequence is randomly selected, or the UE randomly selects the random access preamble sequence, and the secondary serving cell corresponding to the selected random access preamble sequence
  • the PRACH is sent, and the transmission and reception of the random access procedure messages 2, 3, and 4 are performed, thereby solving the problem that the prior art cannot transmit the PRACH on the secondary serving cell in the carrier aggregation scenario, especially the contention-based transmission PRACH.
  • the problem is that the effect of transmitting the PRACH on the secondary serving cell in the carrier aggregation scenario is implemented.
  • Embodiment 2 Referring to FIG.
  • Step S202 The UE selects a random access preamble sequence. In this step, before the UE sends the PRACH, the random access preamble sequence is selected first.
  • the method for selecting a random access preamble sequence may be: the base station sends a random access trigger message to the UE through the primary serving cell or the secondary serving cell, and then the UE randomly selects a random access preamble sequence; or the base station does not send the random connection.
  • the random access preamble sequence is randomly selected by the UE.
  • the base station does not send the random access trigger message
  • the UE randomly selects the random access preamble sequence, and implements the transmission of the carrier aggregation scenario PRACH on the secondary serving cell in the case of no random access trigger message, and expands The applicable scenario of the PRACH transmission scheme of the present invention.
  • the base station may send a random access trigger message through the primary serving cell or the secondary serving cell.
  • the base station sends a random access trigger message to the UE through the primary serving cell
  • the base station sends a random access trigger message to the UE through the high layer signaling or the downlink control channel information on the primary serving cell.
  • the high-level signaling or downlink control channel information of the primary serving cell includes an uplink serving cell index where the PRACH is located. Sending a random access trigger message to the UE by using the high layer signaling or the downlink control channel information; and, by using the high layer signaling or the downlink control channel information, the uplink serving cell, where the PRACH is located, can quickly and accurately indicate that the UE sends the PRACH auxiliary. Service area.
  • the uplink serving cell index where the PRACH is located is located in a carrier indication field (CIF) added in the downlink control channel information;
  • the downlink control channel information further includes: a preamble index and a physical random access channel (PRACH) mask index.
  • PRACH physical random access channel
  • the UE After receiving the downlink control channel information, the UE selects an uplink serving cell corresponding to the uplink serving cell index to send the PRACH.
  • Step S204 In the scenario of carrier aggregation, the UE transmits a physical random access channel on the secondary serving cell. In this step, the base station sends a random access trigger message to the UE through the high layer signaling or the downlink control channel information on the primary serving cell, and the high layer signaling or downlink control channel information of the primary serving cell includes When the uplink serving cell index of the PRACH is located, the UE sends the PRACH on the serving cell indicated by the uplink serving cell index where the PRACH is located.
  • the UE When the base station sends the random access trigger message to the UE through the downlink control channel information on the secondary serving cell, the UE The PRACH is transmitted on the uplink serving cell of the downlink secondary serving cell SIBX (System Information Bit X) that receives the random access trigger message.
  • SIBX System Information Bit X
  • the value of X is 2.
  • the UE learns the uplink serving cell that sends the PRACH through the downlink secondary serving cell SIBX of the random access trigger message, which simplifies the transmission of the PRACH in the secondary serving cell in this case. The process is implemented, and the transmission of the PRACH on the secondary serving cell can be implemented quickly and conveniently.
  • Step S206 The base station sends the random access procedure message 2 to the UE only on the secondary serving cell.
  • the base station is fixed in the downlink serving cell corresponding to the uplink serving cell that sends the PRACH, and sends a random access procedure message 2 to the UE.
  • the UE can obtain the information and resources required by the random access procedure in time to smoothly perform random access.
  • Step S208 The UE detects the downlink control channel information that the base station sends this time, and then detects the random access procedure message 2 according to the downlink control channel information.
  • the UE first detects downlink control channel information when the random access procedure message 2 is sent. Then, the UE detects the random access procedure message 2 on the secondary serving cell according to the downlink control channel information and the preamble index corresponding to the transmitted PRACH.
  • the detecting, by the UE, the downlink control channel information that is sent by the base station is: the UE detects, on the secondary serving cell, the downlink control channel information that is sent by the base station according to the configured RA-RNTI.
  • the detecting, by the UE, the downlink control channel information that is sent by the base station according to the configured RA-RNTI on the secondary serving cell includes: in one subframe, the UE detects downlink control channel information of the public search space on the secondary serving cell and The downlink control channel information of the user-specific search space; or, on the secondary serving cell, the UE detects only the downlink control channel information of the public search space in one subframe, and only detects the secondary serving cell in another subframe. There is downlink control channel information of the search space.
  • Step S210 After receiving the random access procedure message 2, the UE sends a random access procedure message 3 to the base station on the secondary serving cell.
  • the UE sends a random access procedure message 3 to the base station on the secondary serving cell that sends the PRACH.
  • the base station sends a random access procedure message 4 on the downlink serving cell corresponding to the uplink serving cell that sends the PRACH, that is, the base station sends a random connection on the secondary serving cell that sends the random access procedure message 2.
  • the process message 4 Through random access procedure messages 3 and 4, collisions and contention among multiple UEs are effectively solved.
  • Step S214 The UE detects the downlink control channel information that the base station sends this time, and detects the random access procedure message 4 on the secondary serving cell according to the downlink control channel information.
  • the downlink control channel information that is sent this time includes a carrier indication field (CIF), and is used to indicate a serving cell corresponding to the downlink control channel information.
  • the UE may detect the downlink control channel information that the base station sends this time on the primary serving cell or the secondary serving cell.
  • CIF carrier indication field
  • the UE detects the base station according to the temporary cell radio network temporary identifier (Temporary C-RNTI) or the cell radio network temporary identifier (C-RNTI). Downlink control channel information sent this time. Then, the UE detects the random access procedure message 4 on the secondary serving cell according to the downlink control channel information. Preferably, the UE detects that the secondary serving cell of the random access procedure message 4 sends the secondary serving cell of the PRACH to the UE.
  • a contention-based PRACH transmission method is provided.
  • a UE transmits a physical random access channel on a secondary serving cell; and the base station is fixed on a secondary serving cell to send a random access procedure message.
  • the UE After receiving the random access procedure message 2, the UE sends a random access procedure message 3 to the base station on the secondary serving cell; the base station sends a random access procedure message 4 to the UE through the secondary serving cell.
  • the UE can obtain the required information and resources in time; and through the random access procedure messages 3 and 4, the contention conflict between multiple UEs is effectively solved, thereby effectively implementing the carrier in this embodiment.
  • the contention-based PRACH transmission on the secondary serving cell, the contention-based PRACH transmission.
  • the present embodiment also includes a PRACH transmission method based on a non-contention process.
  • the base station may send a random access trigger message through the primary serving cell or the secondary serving cell, and the UE transmits a physical random on the secondary serving cell. Access channel; the base station is fixed on the secondary serving cell to send a random access procedure message 2 to After receiving the random access procedure message 2, the UE sends a random access procedure message 3 to the base station on the secondary serving cell; the base station sends a random access procedure message 4 to the UE through the secondary serving cell.
  • the process message 3 and the message 4 may represent the downlink data and the uplink data after synchronization on the secondary serving cell, and there is no correlation between the message 3 and the message 4, and the message 3 is no longer needed. And message 4 to solve the conflict problem between multiple UEs.
  • Embodiment 3 in this embodiment, in a scenario of carrier aggregation, for a non-contention PRACH transmission, the base station sends a random access trigger message to the UE through the downlink control channel information to trigger the random access process. .
  • the downlink control channel information includes information about an uplink serving cell index where the PRACH is located.
  • the PRACH transmission method in the carrier aggregation of the embodiment includes the following steps: Step S302: The UE receives a random access trigger message sent by the base station, triggers a random access procedure, and selects a random access preamble sequence according to the random access trigger message.
  • the random access trigger message also referred to as the random access procedure message 0, triggers the random access procedure as follows: (1) The UE detects, on the primary serving cell, the downlink control channel information that the base station sends to the UE, that is, random. The trigger message is accessed to trigger the random access procedure.
  • One of the following configurations is required for the downlink control channel information, that is, configuration one: adding a CIF to the serving cell in the downlink control channel information; and configuring two: indicating the serving cell by using control signaling in the downlink control channel information .
  • the configuration is one, that is, when the CIF is added to the downlink control channel information to indicate the serving cell
  • the downlink control channel information sent by the base station in the secondary serving cell is detected by the UE on the primary serving cell.
  • the CIF is added to the downlink control channel information to indicate an uplink serving cell index where the physical random access channel (PRACH) is located.
  • PRACH physical random access channel
  • the CIF has the following features:
  • the CIF includes n bits, and is used to indicate the serving cell corresponding to the downlink control channel information, and the preferred value of n is 3. It should be noted that when the UE is set to detect downlink control channel information including CIF, it only needs to detect the user-specific search space. At this time, the downlink control channel information is carried by the DCI format 1A.
  • the base station When the DCI format 1A is used for the random access procedure and initialized with the downlink control channel sequence (PDCCH order), the base station will transmit the Preamble Index and the DCI format 1 A.
  • the PRACH Mask Index is given to the UE.
  • the UE learns the uplink serving cell that triggers the random access procedure by detecting the downlink control channel information in the DCI format 1A.
  • the downlink control channel information includes the value of the CIF, the Preamble Index, and the PRACH Mask Index, and the UE sends a physical random access channel (PRACH) on the uplink serving cell.
  • PRACH physical random access channel
  • the configuration is two, that is, the serving cell is indicated by the control signaling in the downlink control channel information
  • the downlink control channel information sent by the base station in the secondary serving cell is detected by the UE on the primary serving cell.
  • the downlink control channel information is carried by the DCI format 1A.
  • the base station transmits the Preamble Index and the PRACH Mask Index to the UE through the DCI format 1A.
  • n bits are used to indicate the uplink serving cell index where the physical random access channel (PRACH) is located. Among them, the preferred value of n is 3.
  • the uplink serving cell index may be indicated by several states reserved in the resource allocation information bits in the DCI format lA.
  • the UE learns the uplink serving cell that triggers the random access procedure by using the detected downlink control channel information in the DCI format 1A, where the downlink control channel information includes control signaling, a Preamble Index, and a PRACH Mask Index for indicating the uplink serving cell index. And the UE sends a physical random access channel (PRACH) on the uplink serving cell.
  • PRACH physical random access channel
  • the UE detects the downlink control channel information sent by the base station to the UE on the secondary serving cell to trigger the random access procedure. At this time, the downlink control channel information that is sent by the base station to the UE is detected by the UE on the secondary serving cell.
  • the downlink control channel information is carried by the DCI format 1A.
  • the base station When the DCI format 1A is used for the random access procedure and initialized with the PDCCH order, the base station will send the Preamble Index and the PRACH Mask Index to the UE through the DCI format 1A.
  • the UE obtains a random access trigger message by using the downlink control channel information included in the DCI format 1A detected on the secondary serving cell, and the UE is on the uplink serving cell of the downlink secondary serving cell SIBX link that receives the random access trigger message.
  • a physical random access channel is transmitted. Among them, the preferred value of X is 2. It should be noted that a physical random access channel (PRACH), also referred to as a physical random access message 1.
  • PRACH physical random access channel
  • Step S304 The UE sends the PRACH on the secondary serving cell according to the selected random access preamble sequence.
  • Step S306 After the UE sends the physical random access channel, the base station fixes the physical random access procedure message 2 (Message 2) to the UE on the secondary serving cell.
  • the secondary serving cell in this step is: a downlink serving cell corresponding to the uplink serving cell that sends the physical random access channel.
  • the UE performs PDCCH decoding on the secondary serving cell when the UE is set to the CRC scrambled by the RA-RNTI, and the UE decodes the PDCCH and all related according to the corresponding combination defined in Table 2.
  • PDSCH PDSCH.
  • the configuration of the RA-RNTI is the same for each of the serving cells, and the configuration includes: Configuration 1: In a certain subframe, the UE needs to detect the downlink control channel information of the public search space on the secondary serving cell, and also detects the user-specific information.
  • Downlink control channel information with search space Configuration 2: In a certain subframe, the UE detects only downlink control channel information of the public search space on the secondary serving cell, and detects downlink control of the dedicated search space on another subframe. Channel information.
  • the configuration of the serving cell is configured to be one, that is, in a certain subframe, the UE needs to detect the downlink control channel information of the public search space and the downlink control channel information of the user-specific search space on the secondary serving cell.
  • the UE detects the DCI format1A or the DCI format 1C in the public search space on the secondary serving cell, and is configured to receive the Message 2 sent by the base station, and detect the corresponding DCI format in the user-specific search space, and receive the scheduling indicating the other downlink data. information.
  • the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE decodes the PDCCH and all related PDSCHs according to the corresponding combination defined in Table 2.
  • the UE is also set by the upper layer to perform PDCCH decoding using the CRC scrambled by the C-RNTI, and the UE also decodes the PDCCH and all related PDSCHs according to the corresponding combination defined in Table 3.
  • the configuration of the serving cell is configured as the second, that is, in a certain subframe
  • the UE detects only the downlink control channel information of the public search space on the secondary serving cell
  • the UE detects the DCI formatlA only in the public search space on the secondary serving cell.
  • DCI format 1C used to receive Message 2 sent by the base station. Then, the downlink control channel information of the dedicated search space is detected on another subframe.
  • the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE decodes the PDCCH and all related PDSCHs according to the corresponding combination defined in Table 2.
  • the UE After detecting the downlink control channel information on the secondary serving cell, the UE detects the random access procedure message Message 2 according to the downlink control channel information and the preamble index corresponding to the sent physical random access channel.
  • Step S310 After receiving the random access procedure message 2 sent by the base station, the UE sends a random access procedure message 3 to the base station on the secondary serving cell. In this step, the UE may send the secondary serving cell of the physical random access channel. A random access procedure message 3 is sent to the base station.
  • Step S312 The base station sends a random access procedure message 4 to the UE on the downlink serving cell corresponding to the uplink serving cell that sends the physical random access channel.
  • Step S314 The UE detects downlink control channel information on the primary serving cell according to the temporary C-RNTI or the C-RNTI.
  • the downlink control channel information includes a carrier indication field, and is used to indicate a serving cell corresponding to the downlink control channel information.
  • Step S316 The UE detects the random access procedure message 4 sent by the base station in the secondary serving cell according to the detected downlink control channel information.
  • the non-contention-based secondary serving cell physical random access channel is transmitted in the scenario of carrier aggregation.
  • the process message 3 and the message 4 may represent the downlink data and the uplink data after synchronization on the secondary serving cell, and there is no correlation between the message 3 and the message 4, and the message 3 is no longer needed. And message 4 to solve the conflict problem between multiple UEs.
  • the base station randomly selects a random access preamble sequence to trigger the random access procedure on the secondary serving cell.
  • the PRACH transmission method in the carrier aggregation of this embodiment includes the following steps: Step S402: The UE sends a physical random access channel to the base station on the secondary serving cell.
  • the UE randomly selects a random access preamble sequence, and sends a PRACH on the secondary serving cell corresponding to the random access preamble sequence.
  • Step S404 After the UE sends the physical random access channel, the base station fixes the physical random access procedure message 2 (Message 2) to the UE on the secondary serving cell.
  • the secondary serving cell in this step is: a downlink serving cell corresponding to the uplink serving cell that sends the physical random access channel.
  • Step S406 The UE detects downlink control channel information that is sent by the base station. In this step, the specific method for the UE to detect the downlink control channel information that the base station sends this time is as follows:
  • the UE shall perform PDCCH decoding on the secondary serving cell according to the configured RA-RNTI, when the UE is set to the CRC scrambled by the RA-RNTI, the UE shall decode the PDCCH and all related according to the corresponding combination defined in Table 2.
  • PDSCH PDSCH.
  • the RA-RNTI configured in each serving cell is the same, and the configuration may be the configuration one: in a certain subframe, the UE needs to detect the downlink control channel information of the public search space on the secondary serving cell, and also detects the user-specific information.
  • the downlink control channel information of the search space or, configuration 2: In a certain subframe, the UE detects only the downlink control channel information of the public search space on the secondary serving cell, and then detects the proprietary on another subframe. The downlink control channel information of the search space.
  • the configuration is one, that is, in a certain subframe, the UE needs to detect the downlink control channel information of the public search space and the downlink control channel information of the user-specific search space on the secondary serving cell, and the UE is in the secondary service.
  • the DCI format1A or the DCI format 1C is detected in the public search space for receiving the Message 2 sent by the base station, and the corresponding DCI format is detected in the user-specific search space for receiving scheduling information indicating other downlink data.
  • the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE should decode the PDCCH and all related PDSCHs according to the respective combinations defined in Table 2.
  • the UE is also set by the upper layer to perform PDCCH decoding using the CRC scrambled by the C-RNTI, and the UE also decodes the PDCCH and all related PDSCHs according to the corresponding combination defined in Table 3.
  • the UE detects only downlink control channel information of the public search space on the secondary serving cell, and detects downlink control channel information of the dedicated search space on another subframe, the UE first On the secondary serving cell, the DCI format1A or the DCI format 1C is detected only in the public search space, and is used to receive the Message 2 sent by the base station; and then, the downlink control channel information of the dedicated search space is detected on another subframe. Accordingly, the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE should decode the PDCCH and all related PDSCHs according to the respective combinations defined in Table 2.
  • the UE After detecting the downlink control channel information on the secondary serving cell, the UE detects the random access procedure message Message 2 according to the downlink control channel information and the preamble index corresponding to the sent physical random access channel.
  • Step S408 After receiving the random access procedure message 2 sent by the base station, the UE sends a random access procedure message 3 to the base station on the secondary serving cell. In this step, the UE sends a random access procedure message 3 to the base station on the secondary serving cell that sends the physical random access channel.
  • Step S410 Then, the base station sends a random access procedure message 4 to the UE on the downlink serving cell corresponding to the uplink serving cell that sends the physical random access channel.
  • Step S412 The UE detects downlink control channel information on the primary serving cell according to the temporary cell radio network temporary identifier (temporary C-RNTI) or the cell radio network temporary identifier (C-RNTI).
  • the downlink control channel information includes a carrier indication field, and is used to indicate a serving cell corresponding to the downlink control channel information.
  • Step S414 The UE detects the random access procedure message 4 sent by the base station in the secondary serving cell according to the detected downlink control channel information.
  • the contention-based secondary serving cell physical random access channel is transmitted in the scenario of carrier aggregation. Through the random access procedure messages 3 and 4, the contention conflict between multiple UEs is effectively solved.
  • the PRACH transmission based on the contention mechanism is effectively implemented in the carrier aggregation scenario.
  • Embodiment 5 in a scenario of carrier aggregation, for a non-contention physical random access channel transmission, the base station sends a random access trigger message to the UE through the downlink control channel information to trigger on the secondary serving cell. Random access process.
  • the downlink control channel information includes an uplink serving cell index where the physical random access channel is located.
  • the PRACH transmission method in the carrier aggregation of the embodiment includes the following steps: Step S502: The UE receives a random access trigger message sent by the base station, triggers a random access procedure, and selects a random access preamble sequence according to the random access trigger message.
  • the random access trigger message also called the random access procedure message 0, triggers the random access procedure as follows:
  • the UE detects the downlink control channel information that the base station sends to the UE, that is, the random access trigger message, on the primary serving cell to trigger the random access procedure.
  • One of the following configurations is required for the downlink control channel information, that is, configuration one: adding a CIF to the serving cell in the downlink control channel information; and configuring two: indicating the serving cell by using control signaling in the downlink control channel information .
  • the configuration is one, that is, when the CIF is added to the downlink control channel information to indicate the serving cell
  • the downlink control channel information sent by the base station in the secondary serving cell is detected by the UE on the primary serving cell.
  • the CIF is added to the downlink control channel information to indicate the uplink serving cell index where the physical random access channel is located.
  • the CIF has the following features:
  • the CIF includes n bits, and is used to indicate a serving cell corresponding to downlink control channel information, and a preferred value of n is 3. It should be noted that when the UE is set to detect downlink control channel information including CIF, it only needs to detect the user-specific search space. At this time, the downlink control channel information is carried by the DCI format 1A.
  • the base station When the DCI format 1 A is used for the random access procedure and initialized with the downlink control channel sequence (PDCCH order), the base station will transmit the Preamble Index through the DCI format 1 A. And PRACH Mask Index to the UE.
  • the UE learns the uplink serving cell that triggers the random access procedure by detecting the downlink control channel information in the DCI format 1A.
  • the downlink control channel information includes the value of the CIF, the Preamble Index, and the PRACH Mask Index, and the UE sends the physical random access channel on the uplink serving cell.
  • the configuration is two, that is, the serving cell is indicated by the control signaling in the downlink control channel information, the downlink control channel information sent by the base station on the secondary serving cell is detected by the UE on the primary serving cell.
  • the downlink control channel information is carried by the DCI format 1A.
  • the base station When the DCI format 1A is used for the random access procedure and initialized with the PDCCH order, the base station will send the Preamble Index and the PRACH Mask Index to the UE through the DCI format 1 A.
  • n bits are used to indicate an uplink serving cell index in which the physical random access channel is located. Among them, the preferred value of n is 3.
  • the serving cell index may be indicated by several states reserved in the resource allocation information bits in DCI format lA.
  • the UE learns the uplink serving cell that triggers the random access procedure by using the detected downlink control channel information in the DCI format 1A, where the downlink control channel information includes control signaling, a Preamble Index, and a PRACH Mask Index for indicating the uplink serving cell index.
  • the UE sends a physical random access channel on the uplink serving cell.
  • the UE detects the downlink control channel information sent by the base station to the UE on the secondary serving cell to trigger the random access procedure. At this time, the downlink control channel information that is sent by the base station to the UE is detected by the UE on the secondary serving cell.
  • the downlink control channel information is carried by the DCI format 1A.
  • the base station will send the Preamble Index and the PRACH Mask Index to the UE through the DCI format 1A.
  • the UE obtains a random access trigger message by using the downlink control channel information included in the DCI format 1A detected on the secondary serving cell, and the UE is on the uplink serving cell of the downlink secondary serving cell SIBX link that receives the random access trigger message.
  • a physical random access channel is transmitted. Among them, the preferred value of X is 2. It should be noted that the physical random access channel is also referred to as a physical random access message 1.
  • Step S504 The UE sends the PRACH on the secondary serving cell according to the selected random access preamble sequence.
  • Step S506 After the UE sends the physical random access channel, the base station fixes the physical random access procedure message 2 (Message 2) to the UE on the secondary serving cell.
  • the secondary serving cell is: a downlink serving cell corresponding to an uplink serving cell that sends a physical random access channel.
  • Step S508 The UE detects downlink control channel information sent by the base station.
  • the specific method for the UE to detect the downlink control channel information sent by the base station is as follows:
  • the UE shall perform PDCCH decoding on the secondary serving cell according to the configured RA-RNTI, when the UE is set to the CRC scrambled by the RA-RNTI, the UE shall decode the PDCCH and all related according to the corresponding combination defined in Table 2.
  • PDSCH PDSCH.
  • the configuration of the RA-RNTI is the same for each serving cell, and the configuration includes: Configuration 1: In a certain subframe, the UE needs to detect the downlink control channel information of the public search space on the secondary serving cell, and also detects the user-specific information.
  • Downlink control channel information with search space Configuration 2: In a certain subframe, the UE detects only downlink control channel information of the public search space on the secondary serving cell, and detects downlink control of the dedicated search space on another subframe. Channel information. When configured as one, that is, in a certain subframe, the UE needs to detect the downlink control channel information of the public search space and the downlink control channel information of the user-specific search space on the secondary serving cell, On the serving cell, the DCI format1A or the DCI format 1C is detected in the public search space, and is used to receive the Message 2 sent by the base station, and the corresponding DCI format is detected in the user-specific search space for receiving scheduling information indicating other downlink data.
  • the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE should decode the PDCCH and all related PDSCHs according to the respective combinations defined in Table 2.
  • the UE is also set by the upper layer to perform PDCCH decoding using the CRC scrambled by the C-RNTI, and the UE also decodes the PDCCH and all related PDSCHs according to the corresponding combination defined in Table 3.
  • the UE When configured as configuration 2, that is, in a certain subframe, when the UE detects only the downlink control channel information of the public search space on the secondary serving cell, the UE detects the DCI format1A or DCI format only in the public search space on the secondary serving cell. 1C, configured to receive the Message 2 sent by the base station; and then, detect the downlink control channel information of the dedicated search space on another subframe. Accordingly, the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE should decode the PDCCH and all related PDSCHs according to the respective combinations defined in Table 2.
  • Step S510 After receiving the random access procedure message 2 sent by the base station, the UE sends a random access procedure message 3 to the base station on the secondary serving cell. In this step, the UE sends a random access procedure message 3 to the base station on the secondary serving cell that sends the physical random access channel.
  • Step S512 The base station sends a random access procedure message 4 to the UE on the downlink serving cell corresponding to the uplink serving cell that sends the physical random access channel.
  • Step S514 The UE detects downlink control channel information on the secondary serving cell according to the temporary cell radio network temporary identifier or the C-RNTI.
  • Step S516 The UE detects the random access procedure message 4 sent by the base station in the secondary serving cell according to the detected downlink control channel information.
  • the non-contention-based secondary serving cell physical random access channel is transmitted in the scenario of carrier aggregation.
  • the process message 3 and the message 4 may represent the downlink data and the uplink data after synchronization on the secondary serving cell, and there is no correlation between the message 3 and the message 4, and the message 3 is no longer needed. And message 4 to solve the conflict problem between multiple UEs.
  • Embodiment 6 in the scenario of carrier aggregation, for the transmission of the contending physical random access channel, the base station randomly selects a random access trigger message on the secondary serving cell to trigger the random access procedure.
  • the PRACH transmission method in the carrier aggregation of this embodiment includes the following steps: Step S602: The UE sends a physical random access channel to the base station on the secondary serving cell. In this step, the UE randomly selects a random access preamble sequence, and sends a PRACH on the secondary serving cell corresponding to the random access preamble sequence. Step S604: After the UE sends the physical random access channel, the base station fixes the physical random access procedure message 2 (Message 2) to the UE on the secondary serving cell.
  • Message 2 physical random access procedure message 2
  • the secondary serving cell in this step is: a downlink serving cell corresponding to the uplink serving cell that sends the physical random access channel.
  • Step S606 The UE detects downlink control channel information that is sent by the base station. In this step, the specific method for the UE to detect the downlink control channel information that the base station sends this time is as follows:
  • the UE shall perform PDCCH decoding on the secondary serving cell according to the configured RA-RNTI, when the UE is set to the CRC scrambled by the RA-RNTI, the UE shall decode the PDCCH and all related according to the corresponding combination defined in Table 2.
  • PDSCH PDSCH.
  • the RA-RNTI configured in each serving cell is the same, and the configuration may be the configuration one: in a certain subframe, the UE needs to detect the downlink control channel information of the public search space on the secondary serving cell, and also detects the user-specific information.
  • the downlink control channel information of the search space may be configured as follows: In a certain subframe, the UE detects only the downlink control channel information of the public search space on the secondary serving cell, and detects the proprietary search on another subframe. Downstream control channel information of the space. When the configuration is one, that is, in a certain subframe, the UE needs to detect the downlink control channel information of the public search space and the downlink control channel information of the user-specific search space on the secondary serving cell, and the UE is in the secondary service. On the cell, the DCI format1A or DCI format 1C is detected in the public search space, and is used to receive the sending by the base station.
  • the UE detects a corresponding DCI format in the user-specific search space, and is used to receive scheduling information indicating other downlink data. Accordingly, the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE should decode the PDCCH and all related PDSCHs according to the respective combinations defined in Table 2. At the same time, the UE is also set by the upper layer to perform PDCCH decoding using the CRC scrambled by the C-RNTI, and the UE also decodes the PDCCH and all related PDSCHs according to the corresponding combination defined in Table 3.
  • the UE detects only downlink control channel information of the public search space on the secondary serving cell, and detects downlink control channel information of the dedicated search space on another subframe, the UE first On the secondary serving cell, the DCI format1A or the DCI format 1C is detected only in the public search space, and is used to receive the Message 2 sent by the base station; and then, the downlink control channel information of the dedicated search space is detected on another subframe. Accordingly, the UE is set by the higher layer to perform PDCCH decoding with the CRC scrambled by the RA-RNTI, and the UE should decode the PDCCH and all related PDSCHs according to the respective combinations defined in Table 2.
  • Step S608 After receiving the random access procedure message 2 sent by the base station, the UE sends a random access procedure message 3 to the base station on the secondary serving cell. In this step, the UE sends a random access procedure message 3 to the base station on the secondary serving cell that sends the physical random access channel.
  • Step S610 The base station sends a random access procedure message 4 to the UE on the downlink serving cell corresponding to the uplink serving cell that sends the physical random access channel.
  • Step S612 The UE detects downlink control channel information on the secondary serving cell according to the temporary cell radio network temporary identifier or the cell radio network temporary identifier (C-RNTI).
  • Step S614 The UE detects the random access procedure message 4 sent by the base station in the secondary serving cell according to the detected downlink control channel information.
  • the contention-based secondary serving cell physical random access channel is transmitted in the scenario of carrier aggregation.
  • Embodiment 7 Referring to FIG. 4, a flow chart of steps of a PRACH transmission method in carrier aggregation according to Embodiment 1 of the present invention is shown.
  • the PRACH transmission method of this embodiment may be based on a non-competitive mechanism, and is a non-competitive mechanism-based PRACH transmission method.
  • the PRACH transmission method in the carrier aggregation of this embodiment includes the following steps: Step S702: The UE selects a random access preamble sequence. In this step, before the UE sends the PRACH, the random access preamble sequence is selected first.
  • the method for selecting a random access preamble sequence may be: the base station sends a random access trigger message to the UE through the primary serving cell or the secondary serving cell, and then the UE randomly selects a random access preamble sequence; or the base station does not send the random connection.
  • the random access preamble sequence is randomly selected by the UE.
  • the base station may send a random access trigger message through the primary serving cell or the secondary serving cell.
  • the base station sends a random access trigger message to the UE through the primary serving cell
  • the base station sends a random access trigger message to the UE through the high layer signaling or the downlink control channel information on the primary serving cell.
  • the high-level signaling or downlink control channel information of the primary serving cell includes an uplink serving cell index where the PRACH is located. Sending a random access trigger message to the UE by using the high layer signaling or the downlink control channel information; and, by using the high layer signaling or the downlink control channel information, the uplink serving cell, where the PRACH is located, can quickly and accurately indicate that the UE sends the PRACH auxiliary. Service area.
  • the uplink serving cell index where the PRACH is located is located in a carrier indication field (CIF) added in the downlink control channel information;
  • the downlink control channel information further includes: a preamble index and a physical random access channel (PRACH) mask index.
  • PRACH physical random access channel
  • the UE After receiving the downlink control channel information, the UE selects an uplink serving cell corresponding to the uplink serving cell index to send the PRACH.
  • Step S704 In a scenario of carrier aggregation, the UE transmits a physical random access channel on the secondary serving cell. In this step, the base station sends a random access trigger message to the UE through the high layer signaling or the downlink control channel information on the primary serving cell, and the uplink signaling or downlink control channel information of the primary serving cell includes the uplink of the PRACH. When the cell is indexed, the UE sends a PRACH on the serving cell indicated by the uplink serving cell index where the PRACH is located.
  • the UE When the base station sends a random access trigger message to the UE through the downlink control channel information on the secondary serving cell, the UE receives the random The PRACH is transmitted on the uplink serving cell linked to the downlink secondary serving cell SIBX (System Information Bit X) of the trigger message. Preferably, the value of X is 2.
  • SIBX System Information Bit X
  • the UE learns the uplink serving cell that sends the PRACH through the downlink secondary serving cell SIBX of the random access trigger message, which simplifies the transmission of the PRACH in the secondary serving cell in this case. The process is implemented, and the transmission of the PRACH on the secondary serving cell can be implemented quickly and conveniently.
  • Step S706 The base station sends the random access procedure message 2 to the UE only on the secondary serving cell.
  • the base station is fixed in the downlink serving cell corresponding to the uplink serving cell that sends the PRACH, and sends a random access procedure message 2 to the UE.
  • the UE can obtain the information and resources required by the random access procedure in time to smoothly perform random access.
  • Step S708 The UE detects the downlink control channel information that the base station sends this time, and then detects the random access procedure message 2 according to the downlink control channel information. In this step, the UE first detects downlink control channel information when the random access procedure message 2 is sent. then,
  • the UE detects the random access procedure message 2 on the secondary serving cell according to the downlink control channel information and the preamble index corresponding to the transmitted PRACH.
  • the detecting, by the UE, the downlink control channel information that is sent by the base station is: the UE detects, on the secondary serving cell, the downlink control channel information that is sent by the base station according to the configured RA-RNTI.
  • the detecting, by the UE, the downlink control channel information that is sent by the base station according to the configured RA-RNTI on the secondary serving cell includes: in one subframe, the UE detects downlink control channel information of the public search space on the secondary serving cell and The downlink control channel information of the user-specific search space; or, on the secondary serving cell, the UE detects only the downlink control channel information of the public search space in one subframe, and only detects the secondary serving cell in another subframe. There is downlink control channel information of the search space.
  • the non-contention-based secondary serving cell physical random access channel is transmitted in the scenario of carrier aggregation.
  • the PRACH transmission apparatus in the carrier aggregation of the embodiment may be configured in a mobile terminal, and the apparatus includes: a transmission module 702, configured to send a PRACH on the secondary serving cell; and a first receiving module 704 connected to the transmission module 702, configured to The random access procedure message 2 sent by the base station is received on the secondary serving cell.
  • the PRACH transmission apparatus in the foregoing carrier aggregation further includes: a first sending module 706, connected to the first receiving module 704, configured to send random access on the secondary serving cell after receiving the random access procedure message 2
  • the process message 3 is sent to the base station;
  • the second receiving module 708 is connected to the first sending module 706, and is configured to receive the random access procedure message 4 sent by the base station through the secondary serving cell.
  • the transmitting module 702 triggers the mobile terminal to randomly select a random access preamble sequence, or does not need a random access trigger message, and randomly selects a random access preamble sequence;
  • the random access preamble sequence transmits the PRACH on the secondary serving cell.
  • the random access triggering message is used to trigger the random access procedure, and the UE selects a random access preamble sequence according to the trigger message, and then transmits the PRACH on the secondary serving cell corresponding to the selected random access preamble sequence, or The UE randomly selects the random access preamble sequence, and then transmits and receives the random access procedure messages 2, 3, and 4, thereby solving the problem that the prior art cannot transmit the PRACH on the secondary serving cell in the carrier aggregation scenario, especially Based on the problem of PRACH transmission, the effect of transmitting PRACH on the secondary serving cell in the carrier aggregation scenario is realized.
  • Embodiment 9 Referring to FIG. 7, a block diagram of a structure of a mobile terminal according to Embodiment 9 of the present invention is shown.
  • the mobile terminal in this embodiment is provided with a PRACH transmission device that is applied to the carrier aggregation, and includes: a transmission module 802, configured to send a PRACH on the secondary serving cell; and a first receiving module 804 connected to the transmission module 802, configured to be in the The secondary access cell receives the random access procedure message 2 sent by the base station.
  • the PRACH transmission apparatus in the foregoing carrier aggregation further includes: a first sending module 806, connected to the first receiving module 804, configured to send random access on the secondary serving cell after receiving the random access procedure message 2
  • the process message 3 is sent to the base station;
  • the second receiving module 808 is connected to the first sending module 806, and is configured to receive the random access procedure message 4 sent by the base station through the secondary serving cell.
  • the mobile terminal in this embodiment may be applied to a scenario in which a secondary serving cell transmits a PRACH in a carrier aggregation environment.
  • the transmission module 802 is configured to: after receiving the random access trigger message sent by the base station, trigger the mobile terminal to randomly select a random access preamble sequence, or randomly select a random access trigger message, and randomly select a random access preamble sequence. And transmitting the PRACH on the secondary serving cell according to the selected random access preamble sequence.
  • the random access trigger message is sent by the base station to the mobile terminal by using the high layer signaling of the primary serving cell or the downlink control channel information of the primary serving cell, or by the base station through the downlink control channel information of the secondary serving cell.
  • the information of the uplink serving cell index where the PRACH is located is included in the high layer signaling of the primary serving cell or the downlink control channel information of the serving cell.
  • the information of the uplink serving cell index included in the downlink control channel information of the primary serving cell is set in the CIF added to the downlink control channel information, or is set in the downlink control signaling in the downlink control channel information.
  • the downlink control channel information of the primary serving cell further includes: a preamble index and a PRACH mask index.
  • the transmission module 802 includes: a first sending module 8022, connected to the base station, configured to: when the random access trigger message is sent by the base station to the mobile terminal by using the high layer signaling of the primary serving cell or the downlink control channel information of the primary serving cell, And the information about the uplink serving cell index where the PRACH is located is included in the high-level signaling or the downlink control channel information, and the PRACH is sent on the secondary serving cell indicated by the uplink serving cell index according to the information of the uplink serving cell index; and/or
  • the second sending module 8024 is connected to the base station, and is configured to: when the base station sends a random access trigger message to the UE by using the downlink control channel information of the secondary serving cell, the UE triggers the received random access according to the selected random access preamble sequence.
  • the PRACH is sent on the uplink serving cell of the SIBX link of the downlink secondary serving cell of the message.
  • the secondary serving cell that the base station sends the random access procedure message 2 is the downlink serving cell corresponding to the uplink serving cell that sends the PRACH.
  • the base station is fixed to send the random access procedure message 2 on the downlink serving cell corresponding to the uplink serving cell that sends the PRACH.
  • the first receiving module 804 includes: a first detecting module 8042, connected to the base station, configured to detect, on the secondary serving cell that sends the PRACH, downlink control channel information that is sent by the base station; the second detecting module 8044 is connected to The first detecting module 8042 is configured to detect the random access procedure message 2 according to the downlink control channel information and the preamble index corresponding to the PRACH on the secondary serving cell that sends the PRACH.
  • the first detecting module 8042 detects the downlink control channel information sent by the base station according to the configured RA-RNTI on the secondary serving cell that sends the PRACH.
  • the first detecting module 8042 is configured on the secondary serving cell that sends the PRACH according to the configuration.
  • the RA-RNTI detects the downlink control channel information of the public search space sent by the base station and the downlink control channel information of the user-specific search space in one subframe; or, on the secondary serving cell that sends the PRACH, according to the configured RA-RNTI And detecting only downlink control channel information of the public search space in one subframe, and detecting downlink control channel information of the dedicated search space of the secondary serving cell in another subframe.
  • the second receiving module 808 includes: a third detecting module 8082, connected to the base station, configured to detect, on the primary serving cell or the secondary serving cell, downlink control channel information that is sent by the base station; the fourth detecting module 8084, connecting The third detecting module 8082 is configured to detect the random access procedure message 4 on the secondary serving cell according to the downlink control channel information.
  • the downlink control channel information detected by the third detecting module 8082 includes a CIF, and is set to indicate a serving cell corresponding to the downlink control channel information.
  • the third detecting module 8082 is configured to detect, on the primary serving cell, downlink control channel information sent by the base station according to the temporary C-RNTI or the C-RNTI.
  • the process message 3 and the message 4 may represent the downlink data and the uplink data after synchronization on the secondary serving cell, and there is no correlation between the message 3 and the message 4, and the message 3 is no longer needed. And message 4 to solve the conflict problem between multiple UEs.
  • the method implemented in this embodiment can refer to the related description of the foregoing multiple method embodiments, and has the beneficial effects of the foregoing embodiments, and details are not described herein again. From the above description, it can be seen that the present invention uses the base station to send a random access trigger message, and after receiving the random access trigger message, the UE triggers a random access procedure, and selects according to the random access trigger message.
  • the device accesses the preamble sequence, and then transmits the PRACH on the secondary serving cell according to the selected random access preamble sequence, which solves the problem that the prior art cannot transmit the PRACH on the secondary serving cell, thereby achieving the implementation in the carrier aggregation scenario.
  • the effect of transmitting PRACH on the secondary serving cell can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un dispositif de transmission sur un canal physique d'accès aléatoire (PRACH pour Physical Random Access CHannel) dans une agrégation de porteuses, comprenant les étapes suivantes : un équipement utilisateur (UE pour User Equipment) transmet sur un canal PRACH dans une cellule de desserte secondaire ; l'UE reçoit, dans la cellule de desserte secondaire, un message de traitement d'accès aléatoire 2 transmis par un nœud B évolué (eNB). La présente invention résout le problème de l'état de la technique selon lequel il est impossible de transmettre sur un PRACH dans une cellule de desserte secondaire dans une agrégation de porteuses, ce qui permet une transmission sur un canal PRACH dans une cellule de desserte secondaire dans une agrégation de porteuses.
PCT/CN2012/073126 2011-08-01 2012-03-27 Procédé et dispositif de transmission sur un canal prach dans une agrégation de porteuses Ceased WO2012155693A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019149088A1 (fr) * 2018-01-31 2019-08-08 华为技术有限公司 Procédé et dispositif d'accès aléatoire
US10708853B2 (en) 2015-06-11 2020-07-07 Apple Inc. Low overhead system information acquisition for wireless communication
US11696323B2 (en) 2016-01-29 2023-07-04 Sharp Kabushiki Kaisha Terminal apparatus, base station apparatus, and communication method

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102264150B (zh) * 2011-08-01 2018-01-02 中兴通讯股份有限公司 载波聚合中的prach传输方法及装置
CN106572543B (zh) * 2012-02-15 2020-10-23 华为技术有限公司 随机接入方法、基站及用户设备
CN109560912A (zh) * 2012-03-19 2019-04-02 上海诺基亚贝尔股份有限公司 随机接入从小区的方法和接收数据的方法
CN104837209A (zh) * 2014-02-11 2015-08-12 上海朗帛通信技术有限公司 一种双连接通信中的随机接入方法和装置
WO2015165080A1 (fr) * 2014-04-30 2015-11-05 华为技术有限公司 Dispositif et procédé de réglage d'un paramètre de régulation de puissance d'accès aléatoire
CN107277897A (zh) * 2016-04-07 2017-10-20 中兴通讯股份有限公司 Ra-rnti的配置方法及装置
CN107623947A (zh) * 2016-07-14 2018-01-23 展讯通信（上海）有限公司 基站、用户设备及其随机接入方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080214193A1 (en) * 2006-08-09 2008-09-04 Samsung Electronics Co., Ltd. Method and apparatus for transmitting/receiving information using random access procedure in mobile communication system
CN101453772A (zh) * 2007-12-05 2009-06-10 大唐移动通信设备有限公司 一种随机接入控制方法及装置
CN102036411A (zh) * 2010-12-02 2011-04-27 大唐移动通信设备有限公司 一种进行随机接入的方法及装置
CN102123516A (zh) * 2011-03-31 2011-07-13 电信科学技术研究院 一种基于多个上行定时提前量的随机接入方法和设备
CN102202415A (zh) * 2011-05-18 2011-09-28 中兴通讯股份有限公司 一种物理随机接入信道的传输方法和系统
CN102264150A (zh) * 2011-08-01 2011-11-30 中兴通讯股份有限公司 载波聚合中的prach传输方法及装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080214193A1 (en) * 2006-08-09 2008-09-04 Samsung Electronics Co., Ltd. Method and apparatus for transmitting/receiving information using random access procedure in mobile communication system
CN101453772A (zh) * 2007-12-05 2009-06-10 大唐移动通信设备有限公司 一种随机接入控制方法及装置
CN102036411A (zh) * 2010-12-02 2011-04-27 大唐移动通信设备有限公司 一种进行随机接入的方法及装置
CN102123516A (zh) * 2011-03-31 2011-07-13 电信科学技术研究院 一种基于多个上行定时提前量的随机接入方法和设备
CN102202415A (zh) * 2011-05-18 2011-09-28 中兴通讯股份有限公司 一种物理随机接入信道的传输方法和系统
CN102264150A (zh) * 2011-08-01 2011-11-30 中兴通讯股份有限公司 载波聚合中的prach传输方法及装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10708853B2 (en) 2015-06-11 2020-07-07 Apple Inc. Low overhead system information acquisition for wireless communication
US11197235B2 (en) 2015-06-11 2021-12-07 Apple Inc. Low overhead system information acquisition for wireless communication
US11696323B2 (en) 2016-01-29 2023-07-04 Sharp Kabushiki Kaisha Terminal apparatus, base station apparatus, and communication method
WO2019149088A1 (fr) * 2018-01-31 2019-08-08 华为技术有限公司 Procédé et dispositif d'accès aléatoire
US11425758B2 (en) 2018-01-31 2022-08-23 Huawei Technologies Co., Ltd. Random access method and apparatus

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