WO2017008508A1 - Procédé et dispositif destinés à établir un accès aléatoire en faisant appel à une porteuse non autorisée - Google Patents

Procédé et dispositif destinés à établir un accès aléatoire en faisant appel à une porteuse non autorisée Download PDF

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Publication number
WO2017008508A1
WO2017008508A1 PCT/CN2016/074479 CN2016074479W WO2017008508A1 WO 2017008508 A1 WO2017008508 A1 WO 2017008508A1 CN 2016074479 W CN2016074479 W CN 2016074479W WO 2017008508 A1 WO2017008508 A1 WO 2017008508A1
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WIPO (PCT)
Prior art keywords
random access
terminal
serving cell
base station
secondary serving
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PCT/CN2016/074479
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English (en)
Chinese (zh)
Inventor
陈中明
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中兴通讯股份有限公司
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Publication of WO2017008508A1 publication Critical patent/WO2017008508A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for performing random access based on an unlicensed carrier.
  • the user equipment In the Long Term Evolution (LTE) system, the user equipment (User Equipment, UE for short) in the connected state needs to obtain uplink synchronization and downlink synchronization with the base station before transmitting data to the base station.
  • the uplink synchronization is implemented by performing a random access procedure, in which a Time Advance (TA) is acquired at the same time, and downlink synchronization is implemented by the UE measuring a certain cell, where, TA It is mainly used to let the UE determine the data transmission time.
  • TA Time Advance
  • a random access procedure may be initiated by a base station by sending a physical downlink control channel signaling (PDCCH order) or a medium access control layer (Medium Access). Control, abbreviated as MAC) signaling initiation, as shown in step S1 in FIG.
  • PDCCH order physical downlink control channel signaling
  • MAC medium access control layer
  • RAP dedicated random access preamble
  • RRC radio resource control
  • the dedicated random access preamble can only be allocated by the base station, and the dedicated random access preamble can be configured for the UE by using the PDCCH order or the handover command; when the UE needs to select the random access preamble Then, the random access is a random access of the conflict. In this case, step S1 is not performed, and step S2 is directly executed.
  • the random access resources selected by the UE include: a random access preamble and a time-frequency domain resource of a physical random access channel (Physical Random Access Channel, PRACH for short).
  • PRACH Physical Random Access Channel
  • the conflict resolution process is not solved, but the dedicated random access preamble is allocated to the UE by the network side. Therefore, the processing flow is as shown in FIG. 1, including: steps S1 to S2.
  • the conflicting random access process includes four steps of steps S2 to S5, wherein the functions of steps S4 and S5 are used to resolve conflicts.
  • the UE in the connected state can communicate with the source base station through multiple component carriers (CC).
  • CC component carriers
  • the primary service is also introduced.
  • a primary cell referred to as a Pcell
  • Scell Secondary Cell
  • the uplink can support the Radio Radio Head (RRH) and the retransmission (repeater).
  • RRH Radio Radio Head
  • peerater a time advance TA can not solve the problem, will introduce multiple TA to solve the problem.
  • the serving cell using the same TA is classified into one TA group, the TA group including the Pcell is called PTAG, and the TA group not including the Pcell is called STAG.
  • the timing of performing random access on the Pcell in the PTAG is the same as the timing of performing random access when there is only one TA.
  • There is only one time to perform random access on the STAG that is, the network side notification, that is, only the non-conflicting random connection Into the process.
  • step S1 in FIG. 1 is sent by scheduling the cell
  • step S2 is sent by the relevant Scell
  • step S3 is sent by the Pcell.
  • Unlicensed carrier refers to the spectrum (or carrier) that can be used directly without authorization, subject to the relevant regulations (radio control) of government agencies (eg, National Radio Regulatory Commission). For example, microwave ovens, remote control toy airplanes, wireless mice, wireless keyboards, and Wireless Fidelity (WiFi) use unlicensed carriers. In some cases, unlicensed carriers need to compete to be used. If the base station (including the WiFi access point) does not compete for resources, the unlicensed carrier cannot be used.
  • the unlicensed carrier and the authorized carrier may be used in a carrier aggregation manner or in a dual connectivity manner.
  • the unlicensed carrier is generally used as a supplement to the data transmission, that is, the authorized carrier is used as the primary serving cell, and the unlicensed carrier is used as the secondary serving cell.
  • the present invention provides a method and apparatus for performing random access based on an unlicensed carrier to at least solve the problem in the related art that it is difficult to perform a random access procedure on an unlicensed carrier.
  • a method for performing random access based on an unlicensed carrier including: a terminal receiving base station transmitting a first notification message for indicating that a random access procedure is performed in a secondary serving cell, and Obtaining a resource to the secondary serving cell, where the secondary serving cell is a cell based on the unlicensed carrier; the terminal sending a random access preamble to the base station on the acquired resource; the terminal Receiving, by the receiving window, a random access response RAR message sent by the base station; when the random access preamble carried in the RAR message is consistent with the random access preamble sent by the terminal to the base station, the terminal is in the The random access procedure on the secondary serving cell ends normally.
  • the acquiring, by the terminal, the resource of the auxiliary serving cell includes: receiving, by the terminal, a second notification message of the base station, where the second notification message carries the base station in the auxiliary serving cell a resource that is contending; or the terminal receives a request message sent by the base station for contending for resources in the secondary serving cell, and contends for resources of the secondary serving cell according to the request message, and will compete to The resource informs the base station.
  • the method before the terminal receiving the base station sends a first notification message for indicating that the random access procedure is performed in the secondary serving cell, includes: the terminal receiving a third notification message sent by the base station, where The third notification message carries one or more random access preambles reserved by the base station for the secondary serving cell.
  • the sending, by the terminal, the random access preamble to the base station on the acquired resource the terminal receiving the first notification message sent by the base station, where the first notification message carries a random access preamble in the random access preamble; the terminal determines, according to the random access preamble, a cell that needs to perform a random access procedure, and if the determined cell is the auxiliary serving cell, The first subframe of the resource that the secondary serving cell competes with Sending the random access preamble.
  • the sending, by the terminal, the random access preamble to the base station on the acquired resource includes: when the first subframe is an incomplete subframe, the terminal delays transmitting the random connection in one subframe. Entering a preamble; or, when the secondary serving cell on the unlicensed carrier contends to the first subframe of the resource and does not receive the first notification message sent by the base station, or on the unlicensed carrier When the secondary serving cell competes to the first subframe of the resource and also receives the first notification message sent by the base station, the terminal sends the random in the next subframe after receiving the first notification message. Access the preamble.
  • the method further includes: when the resource of the auxiliary serving cell is exhausted, the terminal suspends receiving The window changes until it again competes for resources of the secondary serving cell.
  • the method further includes: after the obtained resource of the secondary serving cell is exhausted and the obtained resource is not acquired again When the terminal fails to receive the response message again, the terminal does not adjust the transmission power when retransmitting the random access preamble.
  • a method for managing a random access based on an unlicensed carrier includes: the base station transmitting, to the terminal, a first notification message indicating that a random access procedure is performed in the secondary serving cell,
  • the first notification message carries an identifier for indicating the secondary serving cell, the secondary serving cell is a cell based on the unlicensed carrier, and the base station acquires resources of the secondary serving cell, and the Sending the resource to the terminal, where the resource is used by the terminal to send a random access preamble;
  • the base station sends a random access response RAR message to the terminal, where the RAR message carries a random connection Enter the preamble.
  • an apparatus for performing random access based on an unlicensed carrier which is applied to a terminal side, and includes: a first processing module, configured to be sent by the receiving base station to indicate in the auxiliary serving cell Performing a first notification message of the random access procedure, and acquiring resources of the secondary serving cell, where the secondary serving cell is a cell based on the unlicensed carrier; and the first sending module is configured to be obtained Sending a random access preamble to the base station on the resource; the receiving module is configured to receive the random access response RAR message sent by the base station by using an open receiving window, and the executing module is configured to perform random access carried in the RAR message When the preamble is consistent with the random access preamble sent by the terminal to the base station, the random access procedure performed on the secondary serving cell ends normally.
  • a terminal for performing random access based on an unlicensed carrier is provided, and is used by a base station, and includes: a second sending module, configured to send, to the terminal, the indication, in the auxiliary serving cell a first notification message of the random access procedure, where the first notification message carries an identifier for indicating the secondary serving cell, the secondary serving cell is a cell based on the unlicensed carrier, and a second processing module, And the third transmission module is configured to send to the terminal, where the resource is sent to the terminal, where the resource is sent to the terminal, where the resource is used by the terminal to send a random access preamble; And sending a random access response RAR message, where the RAR message carries a random access preamble.
  • the terminal receiving base station sends a first notification message for indicating that the random access procedure is performed in the secondary serving cell, and acquires resources of the secondary serving cell, where the secondary serving cell is an unlicensed carrier.
  • the resource is a resource used by the terminal to send a random access preamble.
  • the terminal receives the RAR message of the base station, and the random access preamble carried in the RAR message and the random number sent by the terminal.
  • the access preambles are consistent, the random access procedure of the terminal on the secondary serving cell ends normally; the problem of the difficulty in performing the random access procedure on the unlicensed carrier in the related art is solved by the present invention.
  • FIG. 1 is a schematic diagram of a random access procedure in an LTE system in the related art
  • FIG. 2 is a flowchart 1 of a method for performing random access based on an unlicensed carrier according to an embodiment of the present invention
  • FIG. 3 is a second flowchart of a method for performing random access based on an unlicensed carrier according to an embodiment of the present invention
  • FIG. 4 is a structural block diagram 1 of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention
  • FIG. 5 is a block diagram 1 of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention
  • FIG. 6 is a block diagram 2 of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention
  • FIG. 7 is a block diagram 3 of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention
  • FIG. 8 is a block diagram 4 of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention
  • FIG. 9 is a structural block diagram 2 of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention.
  • FIG. 10 is a flowchart of a method according to an alternative embodiment 1 of the present invention.
  • FIG. 11 is a flow chart of a method in accordance with an alternative embodiment 2 of the present invention.
  • FIG. 2 is a flowchart 1 of a method for performing random access based on an unlicensed carrier according to an embodiment of the present invention. The process includes the following steps:
  • Step S202 The terminal receiving base station sends a first notification message for indicating that the random access procedure is performed in the secondary serving cell, and acquires resources of the secondary serving cell, where the secondary serving cell is a cell based on the unlicensed carrier;
  • Step S204 The terminal sends a random access preamble to the base station according to the identifier on the acquired resource.
  • Step S206 The terminal opens the receiving window to receive a random access response RAR message sent by the base station.
  • Step S208 When the random access preamble carried in the RAR message is consistent with the random access preamble sent by the terminal to the base station, the random access procedure of the terminal on the secondary serving cell ends normally.
  • the terminal receiving base station sends a first notification message for indicating that the random access procedure is performed in the secondary serving cell, and acquires resources of the secondary serving cell, and the secondary serving cell is unauthorized.
  • a cell of the carrier the resource is a resource used by the terminal to send a random access preamble, and after the random access preamble is sent to the base station, the terminal receives the RAR message of the base station, and the random access preamble carried in the RAR message
  • the random access procedure of the terminal on the secondary serving cell is normally ended.
  • the base station involved in the embodiment has the auxiliary serving cell is that, due to the increase of the traffic volume, the base station adds the auxiliary serving cell to the terminal according to the reporting report reported by the terminal, and the terminal is The primary serving cell of the base station is connected.
  • the method may be implemented as follows:
  • Manner 1 The terminal receives the second notification message of the base station, where the second notification message carries the resources that the base station competes in the auxiliary serving cell.
  • Manner 2 The terminal receives the request message sent by the base station for competing for the resource in the secondary serving cell, and contends the resource of the secondary serving cell according to the request message, and notifies the base station of the contending resource.
  • the manner in which the terminal can acquire the resource may be that the base station advertises the resource to the terminal, and the terminal may contend for the resource of the auxiliary serving cell, that is, the terminal may actively contend for the resource. It may also be a passively accepting resource that the base station competes for, and the resource may be frequency information of the resource, time information, and the like.
  • the manner in which the terminal involved in the step S204 sends the random access preamble on the acquired resource according to the identifier may be implemented in the following manner:
  • Manner 3 The terminal receives the first notification message sent by the base station by using the primary serving cell, where the first notification message carries the identifier of the secondary serving cell and the random access preamble; the terminal is located on the corresponding secondary serving cell according to the identifier.
  • the random access preamble is transmitted on the first subframe that competes with the resource.
  • the method includes: receiving, by the terminal, a third notification message sent by the base station, where the third notification message carries the base station One or more random access preambles reserved for the secondary serving cell.
  • the terminal sends the random access preamble to the base station on the acquired resource, where the terminal receives the first notification message sent by the base station, where the first notification message carries a random access preamble; the terminal determines according to the random access preamble.
  • a cell that needs to perform a random access procedure if the determined cell is a secondary serving cell, sends a random access preamble on the first subframe of the resource that the secondary serving cell contends.
  • the random access preamble obtained by the terminal in the third manner may be that the base station sends a notification message, and the message carries a random access preamble and matches the random access preamble.
  • the auxiliary serving cell identifier in the fourth method, the random access preamble reserved by the base station to the auxiliary serving cell in advance, so that the terminal obtains the auxiliary corresponding to the random access preamble when receiving the random access preamble Service area.
  • the terminal sends a random access preamble on the first subframe that contends for the resource, in the manner that the two methods in the foregoing manners and the fourth method are used to send the random access preamble.
  • the random access preamble is not sent by using the first subframe, and the application scenario of the mode may include:
  • Scenario 1 When the first subframe is an incomplete subframe, the terminal sends a random access preamble after delaying one subframe.
  • Scenario 2 When competing to the first subframe of the resource and not receiving the first notification message sent by the base station, or when competing to the first subframe of the resource and simultaneously receiving the first notification message sent by the base station The terminal sends a random access preamble in the next subframe after receiving the first notification message.
  • the response message involved in the embodiment may further carry the timing advance TA of the random preamble calculated by the base station. Therefore, after the terminal in the step S206 in the embodiment is normal, the random access process on the secondary serving cell ends normally. The terminal transmits data on the secondary serving cell according to the TA.
  • the method of this embodiment further includes: after the terminal accessing the receiving window receives the base station in response to the random access preamble response message, the method further includes: when the resource of the auxiliary serving cell acquired by the terminal is exhausted, the terminal is suspended. The change in the receive window until the content of the secondary serving cell is again contending.
  • the terminal may open the receiving window in the third subframe after the random access preamble is sent, and the window size may be configured, for example, the current configuration is 8 subframes, that is, the window size. It is 8 subframes.
  • the window is opened, the competing resources have been used, and the terminal stops the window from increasing, and is fixed in the length of 3 subframes.
  • the method of this embodiment further includes: after the terminal accesses the resources of the auxiliary serving cell and does not acquire the resource again, after the terminal completes the random access process on the secondary serving cell.
  • the terminal fails to receive the response message again, the terminal resends the random access preamble and does not adjust the transmission power.
  • the terminal may open the receiving window in the third subframe after the random access preamble is sent, and the window size may be configured, for example, the current configuration is 8 subframes.
  • the window After the window is opened, the competing resources have been used, the window continues to open, and the RAR is not received until the end of the window, and no competition resource information is received, or there is no competition for resources.
  • the terminal resends the random access preamble and transmits according to the power of the last random access preamble, without increasing the transmission power.
  • FIG. 3 is a second flowchart of a method for performing random access based on an unlicensed carrier according to an embodiment of the present invention. As shown in FIG. 3, the steps of the method include:
  • Step S302 The base station sends a first notification message to the terminal to indicate that the random access procedure is performed in the secondary serving cell, where the first notification message carries an identifier for indicating the secondary serving cell, and the secondary serving cell is based on the non-granting a cell of a weight carrier;
  • Step S304 The base station acquires the resource of the secondary serving cell, and sends the resource to the terminal, where the resource is used by the terminal to send the random access preamble;
  • Step S306 The base station sends a random access response RAR message to the terminal, where the RAR message carries a random access preamble.
  • the random access preamble carried in the RAR message in step S306 is used to match the random access preamble sent by the terminal, that is, the random carried in the RAR message in step S208 of the embodiment of FIG.
  • the random access procedure of the terminal on the secondary serving cell ends normally; that is, the random access preamble carried in the RAR message may be randomly connected with the terminal.
  • the preambles are consistent and may be inconsistent.
  • FIG. 2 and FIG. 3 describe the present invention from the base station side and the terminal side, respectively. Therefore, the above two embodiments are corresponding, and have been described in detail in the embodiment of FIG. 2, The embodiment of FIG. 3 will not be described again herein.
  • the description on the terminal side reference may be made to the description on the terminal side.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.
  • an apparatus for performing random access based on an unlicensed carrier is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • the apparatus includes: a first processing module 42 configured to receive The base station sends a first notification message for indicating that the random access procedure is performed in the secondary serving cell, and acquires the resource of the secondary serving cell, where the first notification message carries an identifier for indicating the secondary serving cell, and the secondary serving cell
  • the first receiving module 44 is coupled to the first processing module 42 and configured to send a random access preamble on the acquired resource according to the identifier; the first receiving module 46, and the first sending The module 44 is coupled to the receiving window to receive the random access response RAR message sent by the base station.
  • the executing module 48 is coupled to the first receiving module 46 and configured to be a random access preamble and a terminal to be carried in the RAR message.
  • the executing module 48 is coupled to the first receiving module 46 and configured to be a random access preamble and a terminal to be carried in the RAR message.
  • FIG. 5 is a block diagram of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention.
  • the first processing module 42 includes: a first receiving unit 52 configured to receive a base station. a second notification message, wherein The second notification message carries the resource that the base station contends in the secondary serving cell; or the second receiving unit 54 is configured to receive the request message sent by the base station for competing for the resource in the secondary serving cell; the contention unit 56 is set as the basis The request message contends for resources of the secondary serving cell, and notifies the base station of the contending resources.
  • FIG. 6 is a block diagram of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention.
  • the first sending module 44 includes: a third receiving unit 62 configured to receive a base station. a first notification message sent by the primary serving cell of the secondary serving cell, where the first notification message carries the identifier of the secondary serving cell and the random access preamble; the first sending unit 64 is coupled to the third receiving unit 62. And sending, according to the identifier, the random access preamble on the first subframe that contends for the resource on the corresponding secondary serving cell;
  • FIG. 7 is a block diagram 3 of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention. As shown in FIG. 7, the terminal receiving base station transmits a procedure for indicating that a random access procedure is performed in the secondary serving cell.
  • the method of the embodiment further includes: the second receiving module 72 is coupled to the first processing module 42 and configured to receive a third notification message sent by the receiving base station, where the third notification message carries One or more random access preambles reserved by the base station for the secondary serving cell;
  • the first sending module 44 includes: a fourth receiving unit 74, configured to receive a first notification message sent by the base station by using the primary serving cell, where A notification message carries a random access preamble of the plurality of random access preambles reserved by the base station for the secondary serving cell;
  • the second sending unit 76 is coupled to the fourth receiving unit 74 and is configured to be connected according to the random access.
  • the preamble determines the cell that needs to perform the random access procedure, and if the determined cell is the secondary serving cell, the resources that are competed in the secondary serving cell Transmitting a random access preamble on a sub-frame.
  • FIG. 8 is a block diagram of an optional structure of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention.
  • the first sending module 44 includes: a third sending unit 82, configured to be in the first When the subframe is an incomplete subframe, the random access preamble is sent after one subframe is delayed; or the fourth sending unit 84 is configured to contend for the first subframe of the resource and not received by the primary serving cell.
  • the first notification message is received, or when the terminal contends to the first subframe of the resource and also receives the first notification message sent by the primary serving cell, the next subframe after the first notification message is received is randomly sent. Access the preamble.
  • the apparatus of the embodiment further includes: when the resource of the auxiliary serving cell acquired by the terminal is exhausted, the module is suspended, and is set to be suspended. The change in the receive window until the content of the secondary serving cell is again contending.
  • the apparatus in this embodiment further includes: after the resource of the obtained secondary serving cell is exhausted and the resource is not acquired again, the terminal fails to be used again.
  • the processing module is configured to resend the random access preamble and not adjust the transmit power.
  • the response message involved in the embodiment further carries the timing advance TA of the random preamble calculated by the base station; therefore, the executing module 38 is further configured to perform a random access procedure on the secondary serving cell according to the TA.
  • FIG. 9 is a structural block diagram 2 of an apparatus for performing random access based on an unlicensed carrier according to an embodiment of the present invention.
  • the apparatus is applied to a base station side.
  • the apparatus includes: a second sending module 92, configured to The terminal sends a first notification message for indicating that the random access procedure is performed in the secondary serving cell, where the first notification message carries an identifier for indicating the secondary serving cell, and the secondary serving cell is a cell based on the unlicensed carrier;
  • Second processing module 94 with the second hair
  • the sending module 92 is coupled and configured to acquire the resources of the auxiliary serving cell, and send the resource to the terminal, where the resource is used by the terminal to send the random access preamble, and the third sending module 96 is coupled to the second processing module 94. And sending a response message in response to the random access preamble to the terminal, where the response message carries a random access preamble.
  • the optional implementation example provides a method for performing random access by using an unlicensed carrier, and the steps of the method include:
  • Step S402 The base station notifies the terminal to initiate a random access procedure on the Licensed Assisted Access (LAA).
  • LAA Licensed Assisted Access
  • the LAA is a self-scheduled cell.
  • the LAG order is sent on an authorized carrier, such as a Pcell, to trigger a random access procedure on the LAA, and the cell identifier is added on the PDCCH order or the dedicated preamble segment is used to distinguish the request to initiate a random on the Pcell.
  • the access procedure is also initiated by the random access procedure on the LAA.
  • Step S404 After receiving the PDCCH order, the terminal sends a random access preamble.
  • the LAA After the LAA preempts the resource, the LAA is fixed in the first subframe random access preamble of the preempted resource. If the first subframe is an incomplete subframe, the subframe may be delayed by one subframe to send a random access preamble. Code, or no delay.
  • Step S406 The terminal receives the RAR sent by the base station
  • the RAR receiving window (PA Response window) pauses the change of the window when there is no competition for the unlicensed carrier resource, and waits until the resource is competed. If the RAR is not received because the resource is not preempted, the terminal does not adjust the power when retransmitting the random access preamble.
  • the LAA can quickly complete random access and perform data transmission and reception, thereby avoiding the situation that the LAA cannot be used.
  • the base station has two cells, cell 1 (authorized carrier, that is, primary serving cell), cell 3 (unlicensed carrier, that is, auxiliary serving cell), and cell 1 and cell 3 can perform carrier aggregation. .
  • cell 1 and cell 3 can be aggregated by means of dual connectivity, if the cell on the unlicensed carrier is activated and deactivated, the cell needs to be activated before performing the random access procedure.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 10 is a flowchart of a method according to an alternative embodiment of the present invention.
  • a terminal establishes a connection with a cell 1.
  • the base station sends a measurement task to the terminal, and receives a measurement report reported by the terminal.
  • Step S1002 The base station adds the cell 3 to the terminal according to the measurement report, and the cell 3 is a self-scheduling cell according to the measurement report.
  • Step S1004 The terminal receives the configuration command, and adds the cell 3;
  • Step S1006a The base station notifies the terminal that the cell 3 needs to perform a random access procedure, and sends a PDCCH through the cell 1.
  • the order notification terminal in the PDCCH order, carries the identifier of the cell 3, which may be a cell identifier or a serving cell identifier or other indication method indicating the cell 3, and may also carry a dedicated preamble index when it is 60;
  • Step S1006b The base station contends for the resources on the cell 3, and after competing for the resources, notifies the terminal, the information of the competing resources, such as the frequency information of the competing resources, the time information, and the like;
  • step S806a and the step S806b can be performed simultaneously.
  • Step S1008 The terminal acquires a resource that competes
  • Step S1010 The terminal receives the command on the cell 1, and decodes the cell identifier.
  • the cell 3 knows that the random access procedure is required to be initiated on the cell 3, and the random access preamble corresponding to the dedicated preamble index 60 is used, and the base station is received.
  • the information of the competing resources is sent in the first subframe that competes to the resource to transmit the random access preamble.
  • the terminal may Delaying the transmission of the random access preamble in one subframe may also be delayed.
  • the terminal After receiving the contending resource information sent by the base station, if the first subframe of the contending resource, the terminal has not received the PDCCH order on the cell 1, or is in the first subframe of the contending resource
  • the random access preamble is sent in the next subframe of the PDCCH order received on the cell 1, that is, the PDCCH order is received on the cell 1, and the decoding is successful, and the random access needs to be sent.
  • the cell 3 is searched for the start position of the new subframe, and the random access preamble is sent when the subframe is found.
  • Step S1012 After the terminal sends the random access preamble, the third subframe opens the receiving window, and the window size is configurable, for example, the current configuration is 8 subframes.
  • Step S1014 The base station receives the preamble, calculates the TA value, and sends the RAR notification terminal through the cell 1.
  • Step S1016 The terminal receives the random access response sent by the base station, and confirms that the preamble in the response message is the same as the previously transmitted preamble, and the random access process is completed, and the TA of the random access response is obtained;
  • Step S1018 The terminal can perform uplink data transmission in the cell 3 by using the TA.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • Figure 11 is a flowchart of a method according to an alternative embodiment of the present invention.
  • the terminal establishes a connection with the cell 1, and the base station sends a measurement task to the terminal, and receives the measurement report reported by the terminal.
  • the base station sends a measurement task to the terminal, and receives the measurement report reported by the terminal.
  • Step S1102 The base station adds the cell 3 to the terminal according to the measurement report, and the cell 3 is a self-scheduling cell.
  • Step S1104 The terminal receives the configuration command, and adds the cell 3;
  • Step S1106a In the random access dedicated preamble resource of the base station, the index 60-63 is reserved for the LAA cell, that is, the base station sends a dedicated preamble index of 60-63, and the terminal considers that the cell on the LAA should initiate random access.
  • Base station The system broadcasts the broadcast message or the dedicated message to inform the terminal.
  • the base station notifies the terminal that the cell 3 needs to perform a random access procedure, and the PDCCH order is notified by the cell 1 to notify the terminal, and the dedicated preamble index is carried in the PDCCH order is 60;
  • Step S1106b The terminal receives the request of the base station, contends the resources on the cell 3, and after competing for the resource, notifies the base station, the information of the contention of the competition, such as the frequency information of the competing resource, the time information, and the like;
  • step S1006a and step S1006b can be performed simultaneously.
  • Step S1108 the terminal acquires the resource information of the competition
  • Step S1110 The terminal receives the command on the cell 1 and decodes the random access preamble corresponding to the dedicated preamble index 60. It is learned that the random access procedure is required to be initiated on the cell 3, and the first subframe is sent to compete for the resource. The random access preamble.
  • the terminal may Delaying the transmission of the random access preamble in one subframe may also be delayed.
  • Step S1112 After the terminal sends the random access preamble, the third subframe opens the receiving window, and the window size is configurable, for example, the current configuration is 8 subframes.
  • Step S1114 The base station receives the preamble, calculates the TA value, and sends the RAR notification terminal through the cell 3.
  • Step S1116 The terminal receives the random access response sent by the base station, and confirms that the preamble in the response message is the same as the previously transmitted preamble, and the random access process is completed, and the TA of the random access response is obtained;
  • Step S1118 The terminal can perform uplink data transmission in the cell 3 by using the TA.
  • the terminal selects one cell to perform a random access procedure.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • Steps S1202 to S1208 in this embodiment are similar to steps S1102 to S1108 in the second embodiment, except that the following steps are performed;
  • step S1210 the terminal opens the receiving window in the third subframe after the random access preamble is sent, and the window size is configurable.
  • the current configuration is 8 subframes, that is, the window size is 8 subframes.
  • Step S1212 After the window is opened, the three sub-frames are used, and the competing resources have been used, and the terminal stops the window from increasing, and is fixed in the length of 3 subframes.
  • Step S1214 After receiving the subframes, the terminal receives the contending resource information sent by the base station again, or the terminal competes on its own. To the resource, at the beginning of the first sub-frame of the competing resource, the window continues to open, that is, after 4 sub-frames, the 5th sub-frame, the window size becomes 4 sub-frames, if the first sub-frame is incomplete Subframes, the terminal can delay the opening of a window by one subframe, or it can be delayed.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • Steps S1302 to S1308 in this embodiment are similar to steps S1102 to S1108 in the second embodiment, except that the following steps are performed;
  • Step S1310 After the terminal sends the random access preamble, the terminal opens the receiving window in a third subframe, and the window size is configurable, for example, the current configuration is 8 subframes.
  • Step S1312 After the window is opened, the competing resources have been used, the window continues to be opened, and the RAR is not received until the end of the window, and no competition resource information is received, or no resources are competed.
  • Step S1314 The terminal resends the random access preamble and transmits according to the power of the last time the random access preamble is transmitted, without increasing the transmission power.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • Step S1 The terminal receiving base station sends a first notification message for indicating that a random access procedure is performed in the secondary serving cell, and acquires resources of the secondary serving cell, where the secondary serving cell is a cell based on the unlicensed carrier;
  • Step S2 The terminal sends a random access preamble on the acquired resource according to the identifier.
  • Step S3 The terminal opens the receiving window to receive a random access response RAR message sent by the base station.
  • Step S4 When the random access preamble carried in the RAR message is consistent with the random access preamble sent by the terminal, the random access procedure of the terminal on the secondary serving cell ends normally.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network 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.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the terminal receiving base station sends a first notification message for indicating that the random access procedure is performed in the secondary serving cell, and acquires resources of the secondary serving cell, where the secondary serving cell is an unlicensed carrier.
  • the resource is a resource used by the terminal to send a random access preamble.
  • the terminal receives the RAR message of the base station, and the random access preamble carried in the RAR message is sent by the terminal.
  • the random access preambles are consistent, the random access procedure of the terminal on the secondary serving cell ends normally; the problem of the difficulty in performing the random access procedure on the unlicensed carrier in the related art is solved by the present invention.

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

Abstract

L'invention concerne un procédé et un dispositif destinés à établir un accès aléatoire en faisant appel à une porteuse non autorisée. Le procédé consiste à : recevoir, par un terminal, un premier message de notification envoyé par une station de base destiné à indiquer la réalisation d'un processus d'accès aléatoire dans une cellule de desserte secondaire et acquérir des ressources de la cellule de desserte secondaire, la cellule de desserte secondaire étant une cellule sur la base d'une porteuse non autorisée ; envoyer, par le terminal, sur les ressources acquises, un préambule d'accès aléatoire à la station de base ; ouvrir, par le terminal, une fenêtre de réception pour recevoir un message de réponse d'accès aléatoire (RAR) envoyé par la station de base ; quand un préambule d'accès aléatoire porté par le message de RAR est cohérent avec le préambule d'accès aléatoire envoyé par un terminal, le processus d'accès aléatoire réalisé par le terminal dans la cellule de desserte secondaire se termine normalement. La présente invention résout le problème en l'état de la technique selon lequel il est difficile d'établir un accès aléatoire sur une porteuse non autorisée, ce qui permet de combler les lacunes en l'état de la technique.
PCT/CN2016/074479 2015-07-14 2016-02-24 Procédé et dispositif destinés à établir un accès aléatoire en faisant appel à une porteuse non autorisée WO2017008508A1 (fr)

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