WO2013020443A1 - Procédé et dispositif d'accès aléatoire à une cellule secondaire - Google Patents

Procédé et dispositif d'accès aléatoire à une cellule secondaire Download PDF

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Publication number
WO2013020443A1
WO2013020443A1 PCT/CN2012/078854 CN2012078854W WO2013020443A1 WO 2013020443 A1 WO2013020443 A1 WO 2013020443A1 CN 2012078854 W CN2012078854 W CN 2012078854W WO 2013020443 A1 WO2013020443 A1 WO 2013020443A1
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Prior art keywords
random access
css
scell
message
scheduling information
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PCT/CN2012/078854
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English (en)
Chinese (zh)
Inventor
常俊仁
曾清海
陈玉华
黄曲芳
郭轶
张宏平
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华为技术有限公司
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Publication of WO2013020443A1 publication Critical patent/WO2013020443A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • 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
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a device for random access on a secondary cell. Background technique
  • a user equipment obtains uplink synchronization through a random access procedure.
  • the network device does not configure a scheduling request (SR) resource for the UE, or the time alignment timer (TAT) of the UE times out, the UE may also obtain an uplink resource by using a random access procedure. .
  • SR scheduling request
  • TAT time alignment timer
  • a random access mechanism is based on Non-contention based random access, which is shown in Figure 1.
  • the implementing base station eNodeB, eNB
  • the UE sends the Preamble (Standard Access Preamble) for random access on the uplink physical random access channel (PRACH), and the Preamble is also referred to as message 1 for requesting random access of the UE.
  • the base station sends a random access response message (Rank Access Response) to the physical downlink shared channel (PDSCH), and the random access response message is also called message 2, and can be generated by the medium access control layer (MAC), including the UE needs to be adjusted. Timing advance (TA) value.
  • MAC medium access control layer
  • the UE transmits a Preamble for random access, message 1 on the uplink random access channel (RACH).
  • the Preamble may be selected by the UE from a set of 64 Preambles, which implies the size of the message 3 that the UE needs to transmit.
  • Base station on PDSCH Send a random access response message, that is, message 2.
  • the UE sends a first scheduled Scheduled Transmission message, that is, message 3, on the physical uplink shared channel according to the indication of the message 2, and carries the service data unit of the common control channel in the message 3 (Common Control Channel Serving Data Unit (CCCH SDU) or Cell Radio Network Temporary Identifier (C-RNTI).
  • CCCH SDU Common Control Channel Serving Data Unit
  • C-RNTI Cell Radio Network Temporary Identifier
  • the base station replies to the UE with contention resolution, message 4.
  • This message 4 is used to solve the conflict problem caused when multiple UEs use the same preamble. If multiple UEs select the same preamble from the set of 64 Preambles, the message 4 is used to notify one UE that the access is successful. After the UE sends the message 3, it will start a Contention Resolution Timer (CRT). If the UE receives the contention resolution message before the CRT timer expires, it considers that the contention access is successful. If the contention resolution message has not been obtained after the CRT times out, the UE will evade the period of time and initiate random access again.
  • CRT Contention Resolution Timer
  • the scenario in which the contention-based random access procedure may be initiated includes at least: (1) the idle (Idle) state UE initiates initial random access to establish an RRC connection; (2) the UE needs to perform RRC connection reestablishment (RRC Connection Re- (3) The UE side has uplink data to be transmitted, but the UE uplink has lost synchronization; (4) the UE needs to switch; (5) the downlink data arrives on the eNB side, but the UE uplink has lost synchronization.
  • the first four are also referred to as random access initiated by the MAC, and the fifth is called random access initiated by the Physical Downlink Control Channel (PDCCH) command.
  • PDCCH Physical Downlink Control Channel
  • carrier aggregation also called multi-carrier technology
  • LTE-A Long Term Evolution
  • carrier aggregation multiple carriers are aggregated together to serve one UE.
  • the eNB may allocate multiple serving cells to the UE, and each cell corresponds to one CC (Component Carrier).
  • CC Component Carrier
  • one of the CCs is the primary component carrier (PCC)
  • the cell corresponding to the PCC is called the PCell (Primary Cell)
  • the other CCs are the secondary components.
  • Carrier, ) SCC the cell corresponding to the SCC is called SCell (Secondary Cell).
  • the UE When the UE applies carrier aggregation, in order to not excessively increase the number of times the UE blindly detects the PDCCH, on the PCell, it is necessary to blindly detect the CSS (Common Search Space) and DSS (Dedicated Search Space) of the corresponding PCC. .
  • the CSS Common Search Space
  • DSS Dedicated Search Space
  • the UE cannot obtain the PDCCH scheduling information, such as the paging message, the broadcast message, and the like in the SCell, in the CSS of the SCell, so the UE passes the dedicated RRC (Radio Resource Control). The message obtains PDCCH scheduling information of the CSS.
  • the UE When the UE applies carrier aggregation, it may be necessary to configure the function of enabling cross-scheduling, that is, one.
  • the PDCCH on the CC may be used to schedule data transmission on a Physical Downlink Shared Channel (PDSCH) on another CC and/or a Physical Downlink Shared Channel (PUSCH) on the other CC.
  • This function is also called cross-carrier scheduling.
  • This function indicates which of the CCs is scheduled by adding a CIF indication field to the PDCCH. Obviously increasing the CIF indication field will increase the size of the PDCCH signaling itself. Therefore, in order to limit the number of times the UE blindly detects the PDCCH, the PDCCH transmitted in the CS S usually does not carry the CIF indication field, that is, the PDCCH cannot be used for cross scheduling in the CSS.
  • the UE has only one uplink advancement, that is, all serving cells use the same timing advance in the uplink, where the random access procedure is performed only on the PCell, that is, the random access preamble and the random access response.
  • the corresponding PDCCH and PDSCH need to be transmitted on the PCell.
  • Other SCCs use timing advances obtained after random access based on PCC.
  • the UE needs to maintain different TA values on the PCell and the SCell respectively, that is, the PCell and the SCell may not Then use the same TA value, which we usually call a multi-TA scenario.
  • the UE when an SCell is initially configured or activated, in order to ensure that the UE using the SCell obtains the correct TA value for the SCell, the UE still needs to perform a random access procedure on the SCell. Specifically, the UE Stochastic access based on contention can be performed, and non-contention random access can also be performed. Regardless of whether it is a contention-based random access procedure or a non-contention-based random access procedure, the UE needs to obtain the scheduling information of the message 2 (ie, the random access response message) from the CSS, that is, the CSS of the SCell needs to be monitored.
  • the scheduling information of the message 2 ie, the random access response message
  • the UE For the UE, listening to a space, whether the space is DSS or CSS, needs to be implemented by blindly detecting the space, that is, the UE decodes the space by using various possible downlink control information (DCI) formats. Obtain downlink scheduling information transmitted through the space. Since the UE does not know what DCI format is used by the network side to encode the scheduling information, it is necessary to try a variety of possible DCI formats, and such an attempt in blind detection consumes the power of the UE. The UE needs to acquire the scheduling information corresponding to the SCell by performing the random access procedure on the SCell. Therefore, the CSS of the SCell is monitored, and a certain number of blind detections are required to consume the power of the UE.
  • DCI downlink control information
  • the number of blind detections will further increase.
  • the SCell that needs to perform random access is newly added for the UE, how to ensure the success of the random access and reduce the power consumption of the UE as much as possible is a problem.
  • the embodiments of the present invention provide a method and a device for randomly accessing a secondary cell SCell, so as to limit the monitoring process of the SCell during the random access process on the SCell, thereby reducing the number of blind detections for performing the monitoring.
  • the method of random access on the SCell includes:
  • a method for managing random access of a user equipment UE on a secondary cell SCell including:
  • a user equipment UE that is randomly accessed on a secondary cell SCell, including:
  • An uplink sending unit configured to send, by using a SCell, a preamble preamble for random access to the base station;
  • a monitoring processing unit configured to monitor a common search space CSS of the SCell
  • a downlink receiving unit configured to: acquire, by the monitoring processing unit, scheduling information of a random access response message in the CSS by monitoring the CSS After obtaining the random access response message from the base station according to the scheduling information of the random access response message;
  • the listening processing unit is further configured to:
  • the downlink receiving unit After the downlink receiving unit obtains the random access response message, stopping monitoring the CSS;
  • the uplink sending unit successfully sends the first scheduled uplink transmission message to the base station, stopping the monitoring of the CSS, where the uplink sending unit is further configured to obtain the location in the downlink receiving unit. After the random access response message is sent, sending the first scheduled uplink transmission message to the base station;
  • the downlink receiving unit receives the contention resolution message sent by the base station, stopping the monitoring of the CSS, where the uplink sending unit is further configured to obtain the random access in the downlink receiving unit.
  • the uplink sending unit is further configured to obtain the random access in the downlink receiving unit.
  • the downlink receiving unit is further configured to: after the uplink sending unit successfully sends the first scheduled uplink transmission message to the base station, Receiving the contention resolution message.
  • a base station for managing random access of a user equipment UE on a secondary cell SCell including:
  • a downlink sending unit configured to send an indication message of random access to the UE, indicating the UE Perform a random access procedure on the SCell;
  • An uplink receiving unit configured to receive, on the SCell, a preamble reamble for random access from the UE;
  • a scheduling processing unit configured to send scheduling information of the random access response message to the UE by using a common search space CSS of the SCell in response to the preamble;
  • the downlink sending unit is further configured to send the random access response message to the UE according to scheduling information of the random access response message;
  • the scheduling processing unit is further configured to:
  • the downlink sending unit After the downlink sending unit sends the random access response message, stopping sending the scheduling information of the UE to the UE on the CSS;
  • the uplink receiving unit successfully receives the first scheduled uplink transmission uplink receiving unit sent by the UE, and is further configured to: after the downlink sending unit sends the random access response message, receive the first Scheduled uplink transmission messages;
  • the downlink sending unit sends a contention resolution cancellation receiving unit to the UE, and is further configured to: after the downlink sending unit sends the random access response message, receive the first sent by the UE
  • the scheduled uplink transmission message is further configured to: after the uplink receiving unit successfully receives the first scheduled uplink transmission message, send the contention resolution message to the UE.
  • the embodiment of the present invention has the following advantages: when the UE performs random access on the SCell, by limiting the behavior of the UE listening to the CSS of the SCell, stopping the CSS when necessary The monitoring can ensure that the UE successfully completes the random access procedure on the SCell, and reduces the time for the UE to listen to the CSS of the SCell, thereby reducing the number of blind detections and reducing the power consumption of the UE.
  • DRAWINGS when the UE performs random access on the SCell, by limiting the behavior of the UE listening to the CSS of the SCell, stopping the CSS when necessary
  • the monitoring can ensure that the UE successfully completes the random access procedure on the SCell, and reduces the time for the UE to listen to the CSS of the SCell, thereby reducing the number of blind detections and reducing the power consumption of the UE.
  • FIG. 1 is a schematic diagram of a non-contention based random access procedure
  • FIG. 2 is a schematic diagram of a contention-based random access procedure
  • FIG. 3 is a schematic diagram of a method for a UE to randomly access a SCell by performing a blind detection restriction operation according to an embodiment of the present invention
  • FIG. 3b is a schematic diagram of another method for a UE to perform random access on a SCell by performing a blind detection restriction operation according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of another method for a UE to perform random access on a SCell by performing a blind detection restriction operation according to an embodiment of the present invention
  • FIG. 4a is a downlink scheduling management performed by a base station by performing restriction according to an embodiment of the present invention.
  • FIG. 4b is a schematic diagram of another method for a base station to randomly access a UE on a SCell by performing a restricted downlink scheduling according to an embodiment of the present invention
  • FIG. 4c is a schematic diagram of another method for a base station to randomly access a UE on a SCell by performing a restricted downlink scheduling according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for a UE to perform random access to a base station in a SCell according to an embodiment of the present invention
  • FIG. 6 is a flowchart of another method for a UE to perform random access to a base station in a SCell according to an embodiment of the present invention
  • FIG. 7 is a flowchart of another method for a UE to perform random access to a base station in an SCell according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of a user equipment that is randomly accessed on an SCell according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a base station that manages a UE to randomly access on an SCell according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a method for a UE to perform random access on a SCell by performing a blind detection restriction operation according to an embodiment of the present invention, which may include:
  • S31 Send, by the SCell, a preamble preamble for random access to the base station; the preamble, also called message 1, is used by the UE to request random access from the base station.
  • S32 Listen to the common search space CSS of the SCell. This monitoring is performed by blind detection, and the UE can implement such blind detection by using multiple DCI formats.
  • the scheduling information may be scrambled by a certain symbol, and the UE may use only a random access radio network temporary identifier (RA-RNTI) or a temporary cell radio network temporary identifier (Temporary C-RNTI) to descramble the CSS. Perform blind detection.
  • the UE may initiate monitoring of the CSS after sending the preamble.
  • the UE may only start to listen to the CSS without starting the
  • SCell's DSS is listening. If the current UE is listening to the DSS, the UE may stop or suspend listening to the DSS.
  • the UE can also listen to this CSS first when performing this listening process. If there is no blind detection margin, the UE does not listen to the DSS. If there is a blind detection margin, the blind detection margin is used to monitor the DSS of the SCell, thereby balancing the transmission of service data. Listening to the DSS allows the UE to obtain scheduling information of the user plane data, thereby fully utilizing the blind detection margin and implementing data transmission.
  • the blind detection margin is the difference between the maximum number of blind detections supported by the UE and the number of blind detections currently used. The number of blind detections currently used has already included the number of blind detections required to listen to the CSS.
  • the UE can obtain scheduling information related to random access, such as scheduling information of a random access response message or scheduling information of a contention resolution message, by monitoring the CSS. Further, by using the monitoring, the UE may also obtain scheduling information of user plane data or scheduling information of dedicated signaling.
  • S33 After obtaining the scheduling information of the random access response message in the CSS by listening to the CSS, acquiring the random access response message from the base station according to the scheduling information of the random access response message. After the UE sends the message 1, the UE needs to obtain the message 2 from the base station, that is, the random access response message. The UE first needs to obtain the scheduling information of the random access response message, and the UE may listen to the CSS of the SCell to obtain the scheduling information. Specifically, the UE may obtain the scheduling information by descrambling the CSS by using a random access radio network temporary identifier (RA-RNTI).
  • RA-RNTI random access radio network temporary identifier
  • the UE may learn, according to the scheduling information of the random access response message, the resource that the base station sends the random access response message, where the resource may include the time resource and the frequency domain resource that send the random access response message, so that the UE may The random access response message is received on a response resource.
  • S34a After obtaining the random access response message, stop listening to the CSS. After the scheduling information of the random access response message is obtained on the CSS of the SCell, the random access response message may be received from the base station according to the scheduling information. After receiving the message, the UE successfully performs random access in the SCell, where the UE is The CSS of the SCell can be stopped from being monitored, thereby reducing the number of blind detections caused by continuously monitoring the CSS, which is beneficial to saving the UE power. Further, after S34a, the UE may start to monitor the DSS of the SCell to receive scheduling information of the subsequent user plane data or scheduling information of the dedicated control signaling on the DSS.
  • the method corresponding to Figure 3a can be applied in a non-contention based random access procedure.
  • the above process S34a may be replaced by S34b and S35b, as shown in Fig. 3b, in Fig. 3b, After S33, the UE further performs:
  • S35b After successfully transmitting the first scheduled uplink transmission message to the base station, stopping monitoring the CSS.
  • Figure 3b can be used by the UE to perform a contention based random access procedure.
  • the UE sends the first scheduled uplink transmission message (message 3) to the base station after receiving the random access response message.
  • the first scheduled uplink transmission message may include an identifier C-RNTI of the UE or another identifier, so that the base station can learn that the UE has successfully acquired the random access response message.
  • the UE may stop the CSS. Monitor.
  • the acknowledgment indication information may be an ACK from a base station.
  • the blind detection stops which is beneficial to save the power of the UE.
  • the UE may start to monitor the DSS of the SCell, and receive the scheduling information of the subsequent user plane data or the scheduling information of the dedicated control signaling on the DSS. For example, in the contention-based random access, the UE may subsequently receive the scheduling information of the contention resolution message by listening to the DSS, so as to know which time-frequency resources to receive the contention resolution message.
  • This embodiment also provides another contention-based random access implementation.
  • the scheme is shown in Figure 3c.
  • the process S34a of Figure 3a can be replaced by S34c, S35c and S36c.
  • the UE further performs:
  • S35c After successfully transmitting the first scheduled uplink transmission message to the base station, receiving a contention resolution message sent by the base station.
  • S36c After receiving the contention resolution message, the UE may stop listening to the CSS.
  • the UE may not immediately stop the monitoring of the CSS, and may obtain the scheduling information of the contention resolution message by listening to the CSS, and successfully obtain the contention from the base station. After the resolution message, stop listening to the CSS. The subsequent UE may then listen to the DSS of the SCell, and obtain scheduling information of the user planes and other scheduling information of the control information required by the UE on the DSS.
  • the UE may obtain scheduling information for retransmitting the first scheduled uplink transmission message by continuing to listen to the CSS.
  • the scheduling information for retransmitting the first scheduled uplink transmission message is sent by the base station, and is used to indicate that the UE performs retransmission of the first scheduled uplink transmission message, and the UE may implement the location based on the indication. Retransmission of the first scheduled uplink transmission message until the retransmission is successful, or until the maximum number of retransmissions is reached.
  • the UE can simultaneously monitor the CSS and the DSS of the SCell when performing random access on the SCell, or if the UE only listens to the CSS in the random access,
  • the indication of any of the processes of Figures 3a through 3c initiates listening to the DSS.
  • the UE may perform blind detection on the DSS by using only one of the downlink control information DCI format corresponding to the current transmission mode and the DCI format corresponding to the fallback mode. DSS listens.
  • this embodiment briefly introduces the fallback mode.
  • the DCI format used by the UE and the base station is also changed.
  • the prior art introduces a fallback mode.
  • the UE detects the current DCI format.
  • the UE performs PDCCH blind detection, it is generally required to perform blind detection on two possible DCI formats for indicating a downlink transmission configuration, one is a DCI format corresponding to a current transmission mode (Tx mode), and one is Fallback mode The DCI format.
  • Tx mode current transmission mode
  • Fallback mode The DCI format.
  • the Tx mode should also be changed accordingly.
  • the mode of transmitting the PDCCH needs to be smoothly transitioned from the original Tx mode to the new Tx mode. That is to say, in the transition phase, the UE performs blind detection using the DCI format corresponding to the fallback mode to obtain scheduling information, so as to avoid that the scheduling information cannot be received during the handover process.
  • the UE listening to the DSS needs to monitor the DCI format corresponding to the two modes. However, in this embodiment, the UE does not listen to the DSS in the random access, or stops listening to the DSS. If the UE has a blind detection margin, the UE can simultaneously perform blind detection on the two spaces of the SCell. In this case, in order to further reduce the number of blind detections, the UE may also blind the DSS by using only one of the downlink control information DCI format corresponding to the current transmission mode and the DCI format corresponding to the fallback mode. Detecting to enable monitoring of the DSS.
  • the embodiment of the present invention can reduce the number of blind detections by using the above-mentioned blind detection limiting operation, by starting the blind detection of the CSS of the SCell for a period of time, and stopping the blind detection at an appropriate timing, relative to always being in the CSS
  • the embodiment of the present invention performs the blind detection of the CSS of the SCell in all or part of the random access only when the random access is required on the SCell, so this embodiment
  • the blind detection limit operation provided can reasonably save the power of the UE.
  • the UE may determine in advance whether the blind detection margin is less than a certain threshold, and the threshold may be set by a person skilled in the art based on actual needs.
  • the random access procedure based on the blind detection restriction operation provided in this embodiment may be triggered to limit blind detection in random access.
  • the UE may trigger the random access procedure based on the blind detection restriction operation based on the indication of the base station.
  • FIG. 4 is a schematic diagram of a method for a base station to manage random access of a UE on an SCell by performing restricted downlink scheduling according to an embodiment of the present invention.
  • the method may be applied to a non-contention based random access procedure, and may include :
  • S41 Send an indication message of random access to the user equipment UE, instructing the UE to perform a random access procedure on the SCell.
  • the base station may notify the UE that the random connection is required by sending the indication message.
  • the indication message of the random access may include an indication of whether a blind detection restriction operation needs to be performed. If so, the UE may perform the method of the present embodiment based on the indication, performing blind detection restriction to reduce the number of blind detections in the random access procedure.
  • S42 Receive a preamble preamble for random access from the UE on the SCell.
  • S43 Send, according to the preamble, scheduling information of the random access response message to the UE by using a common search space CSS of the SCell.
  • the base station first informs the UE of the location of the time-frequency resource of the random access response message by transmitting the scheduling information in the CSS.
  • the base station can scramble the scheduling information through the RA-RNTI.
  • the UE may obtain the information by descrambling the RA-RNTI.
  • the RA-RNTI S44 transmits the random access response message to the UE based on scheduling information of the random access response message.
  • S45a After sending the random access response message, stop sending scheduling information of the UE to the UE on the CSS.
  • the base station may stop continuing scheduling information in the CSS, so that the UE does not need to continue blind detection in the CSS, thereby reducing UE blindness. The number of detections saves UE power.
  • S45a may be replaced by S45b and S46b, as shown in FIG. 4b, including:
  • S45b After sending the random access response message, receive the first scheduled uplink transmission message sent by the UE.
  • S46b After successfully receiving the first scheduled uplink transmission message, stop sending the scheduling information of the UE to the UE on the CSS. If the base station does not successfully receive the first scheduled uplink transmission message, the UE may send scheduling information for retransmitting the first scheduled uplink transmission message to the UE, and notify the UE to repeatedly send the first scheduled Uplink transmission of the message until the base station receives success or until the UE reaches the maximum number of retransmissions. After the base station successfully receives the first scheduled uplink transmission message, the base station may stop sending scheduling information to the UE at the CSS. The base station may subsequently transmit scheduling information of the user plane data and scheduling information of other control information to the UE on the DSS of the SCell.
  • the base station may send scheduling information of the contention resolution message to the UE on the DSS, so that the UE receives the contention resolution message based on the scheduling information, and implements successful access to the base station.
  • the base station may perform dynamic port interference on the scheduling information of the contention resolution by using the temporary C-RNTI of the UE or the C-RNTI of the UE.
  • S45b and S46b may be replaced by S45c, S46c and S47c, as shown in FIG. 4c, including:
  • S47c After sending the contention resolution message to the UE, stop sending the scheduling information of the UE to the UE on the CSS.
  • the base station may stop sending the content to the UE on the CSS after sending the contention resolution message to the UE.
  • the scheduling information of the UE After notifying the UE that the access is successful, stopping using the CSS to transmit scheduling information to the UE, and then transmitting subsequent scheduling information to the UE on the DSS of the SCell, such as scheduling information of user plane data and other dedicated control.
  • Information scheduling information After notifying the UE that the access is successful, stopping using the CSS to transmit scheduling information to the UE, and then transmitting subsequent scheduling information to the UE on the DSS of the SCell, such as scheduling information of user plane data and other dedicated control.
  • the base station may send an uplink to the first scheduling to the UE on the CSS.
  • the scheduling information for transmitting the message for retransmission is such that the UE can retransmit the first scheduled uplink transmission message.
  • the base station may further use the C-RNTI of the UE to scramble scheduling information of user plane data transmitted to the UE on the CSS or Scheduling information of the dedicated signaling, and transmitting the scheduling information of the user plane data or the scheduling information of the dedicated signaling to the UE, thereby taking into account other scheduling except the scheduling information related to the access. That is to say, in addition to the random access related scheduling information sent to the UE by using the CSS, the base station may also send scheduling information of other signaling or scheduling information of the data to the UE on the CSS to fully utilize the resources of the CSS. Of course, the base station may not use the CSS to send other scheduling information than the random access related scheduling information.
  • the scheduling information sent by the CSS can be scrambled with a certain symbol.
  • the base station can use the RA-RNTI or the temporary C-RNTI of the UE, or the C-RNTI of the UE to scramble the scheduling information that needs to be transmitted.
  • the UE can perform blind detection on the CSS by using only the RA-RNTI or the temporary C-RNTI, or the C-RNTI descrambling of the UE.
  • the base station may send the scheduling information only on the CSS, instead of using the DSS to send scheduling information in the random access procedure, thereby saving the UE blind detection times. . If the base station is using the DSS, the base station may stop or suspend transmission of scheduling information to the UE on the DSS of the SCell.
  • the base station may transmit scheduling information of user plane data or scheduling information of dedicated signaling to the UE through the DSS of the SCell.
  • the base station may specifically transmit scheduling information to the UE in the DSS of the SCell by using a C-RNTI scrambling manner of the UE when the UE has sufficient blind detection margin.
  • the base station may send the user plane data in the DSS by using only one of the downlink control information DCI format corresponding to the current transmission mode and the DCI format corresponding to the fallback mode. Scheduling information or scheduling information of dedicated signaling to save blind detection times.
  • the base station may transmit scheduling information of user plane data or scheduling information of dedicated signaling to the UE through the DSS.
  • the base station can cooperate with the UE to implement random connection on the SCell.
  • the base station can use the CSS of the SCell to send the scheduling information to the UE, and stop using the CSS when appropriate, thereby reducing the time for the UE to perform blind detection on the CSS, and saving the power of the UE.
  • the base station may perform the foregoing method when the blind detection margin of the UE is less than a preset threshold.
  • the base station may instruct the UE to perform a blind detection restriction operation corresponding to the scheduling method of the base station by sending an execution message, so that the UE performs the flow shown in any one of FIG. 3a to FIG. 3c.
  • FIG. 5 is a flowchart of a method for a UE to perform random access to a base station in a SCell according to an embodiment of the present disclosure, where the method includes:
  • the UE is triggered by the base station to perform a random access procedure in the SCell.
  • the base station may send an indication message to the UE to instruct the UE to perform the access procedure.
  • the base station may allocate a dedicated preamble to the UE in the indication message triggering the access procedure.
  • the UE sends the dedicated Preamble to the base station on the PRACH resource of the SCell.
  • S53 The UE monitors the CSS of the SCell.
  • the UE may initiate monitoring of the CSS after transmitting the Preamble. If the UE is currently listening to the DSS of the SCell, the UE switches from the monitoring of the DSS to the CSS that listens to the SCell to obtain scheduling information of the random access response message. The UE is currently listening to the DSS, possibly because the downlink carrier of the SCell is activated first or the downlink carrier is normal but the uplink transmission is out of synchronization. Although the UE needs to perform random access, there is downlink data reception. Optionally, the UE may preferentially monitor the CSS of the SCell, and listen to the DSS of the SCell if there is a blind detection margin; otherwise, the UE directly listens to the CSS of the SCell without listening to the DSS search space. The UE may perform the monitoring of the CS S using only the RA-RNTI and/or the temporary C-RNTI.
  • the base station sends scheduling information of the random access response message to the UE.
  • the base station sends a random access response message to the UE.
  • the UE switches the search space of the interception, and switches from the CSS that monitors the SCell to the DSS search space that only listens to the SCell.
  • S57 The base station and the UE perform normal data transmission on the DSS. Scheduling letter of the data Information can be transmitted through the DSS and scrambled by C-RNTI.
  • FIG. 6 is a flowchart of a method for performing a contention-based random access by a UE to a base station in a SCell according to an embodiment of the present invention. The method includes:
  • the UE is triggered to perform a random access procedure in the SCell, and the trigger may be implemented by using an indication message of the base station.
  • the UE sends the dedicated Preamble to the base station on the PRACH resource of the SCell.
  • the UE may randomly select a reamble in a reamble set and send the selected preamble to the base station.
  • S63 The UE monitors the CSS of the SCell. This process is similar to S53 in Figure 5 and will not be described here.
  • the base station sends scheduling information of the random access response message to the UE.
  • the base station sends a random access response message to the UE.
  • the UE sends the first scheduled uplink transmission message to the base station.
  • the base station fails to successfully receive the first scheduled uplink transmission message, it may trigger the UE to retransmit.
  • the UE may resend the first scheduled uplink transmission message until the base station successfully receives the first scheduled uplink transmission message.
  • the scheduling information that the base station triggers the retransmission of the UE may also be sent in the CSS, so that the UE listens to the scheduling information on the CSS.
  • the UE may learn whether the base station successfully receives the first scheduled uplink transmission message by receiving an ACK/NACK acknowledgment from the base station.
  • the NACK may be used to instruct the UE to retransmit the first scheduled uplink transmission message.
  • the UE After the first scheduled uplink transmission message is successfully received by the base station, the UE switches the monitored search space, and switches from the CSS that monitors the SCell to the DSS that only listens to the SCell.
  • S68 The base station sends the scheduling information of the contention resolution message to the UE in the DSS search space.
  • the scheduling information can be scrambled by the C-RNTI.
  • the UE may use the C-RNTI to descramble the scheduling information of the contention resolution message on the DSS, and obtain the time-frequency resource location of receiving the contention resolution message based on the scheduling information of the contention resolution message.
  • S69 The base station sends the contention resolution message to the UE. After receiving the contention resolution message, the UE indicates that the UE's contention access is successful.
  • the base station performs data transmission with the UE.
  • the scheduling information of the data may be transmitted through the DSS and scrambled by C-RNTI.
  • FIG. 7 is a flowchart of another method for a UE to perform contention-based random access to a base station in a SCell according to an embodiment of the present disclosure, where the method includes:
  • the base station After the first scheduled uplink transmission message is successfully received by the base station, the base station sends scheduling information of the contention resolution message to the UE on the CSS.
  • the scheduling information is used to indicate to the UE the location of the time-frequency resource for receiving the contention resolution message.
  • the scheduling information may be scrambled by the UE's temporary C-RNTI and sent to the UE on the CSS.
  • S78 The base station sends a contention resolution message to the UE.
  • the UE searches for the search space of the interception, and switches from the CSS that monitors the SCell to the DSS that only listens to the SCell. After receiving the contention resolution message, the UE indicates that the UE's contention access is successful.
  • the base station performs data transmission with the UE.
  • the scheduling information of the data may be transmitted through the DSS and scrambled by C-RNTI.
  • the UE and the base station may determine whether the blind detection margin of the UE is greater than a certain threshold, and if yes, perform the solution in this embodiment.
  • the threshold may be set by an expert in the art and by a person, for example, 44 or 60 times, and the like. If the blind detection margin of the UE is less than the threshold, the UE and the base station may perform random access according to an existing procedure. Which random access the UE performs may be notified by the base station transmitting the indication information. Specifically, the indication information may be carried in the random access indication message sent by the base station to the UE.
  • the following supplementary solution may be considered, and the solution may be directed to downlink synchronization and uplink out-of-synchronization.
  • Solution 1 When the base station triggers the UE to perform random access on the SCell, the base station pauses at the SCell. User plane data is scheduled.
  • the base station sends the scheduling information of the user plane data by using the C-RNTI scrambling mode of the UE on the CSS when the UE performs the random access in the SCell, and the UE uses the C-RNTI on the SCell on the CSS.
  • the transmitted information is descrambled to obtain user plane data transmitted on the SCell.
  • the base station uses only one of the two DCI formats for blind detection in the DSS to send scheduling information of the user plane data to the UE, where the two DCI formats include : The DCI format corresponding to the current transmission mode and the DCI format corresponding to the fallback mode.
  • the UE performs blind detection on the DSS using the DCI format corresponding to the base station side to acquire scheduling information of the user plane data, and determines the location of the time-frequency resource of the received data based on the obtained scheduling information to receive the data.
  • the base station may send a dedicated message to inform the UE which one of the two DCI formats to perform blind detection, and the base station and the UE can respectively perform transmission and blind detection of the scheduling information by using the same DCI format. Either the base station and the UE use one of the DCI formats by default.
  • the search space switching may be implemented, and the CSS that listens to the SCell turns to listen to the DSS of the SCell, and passes the Timely or best-effort DSS monitoring ensures the transmission of service data, and can minimize the number of UE blind detections and reduce the false alarm probability caused by blind detection.
  • FIG. 8 is a schematic diagram of a user equipment 80 that is randomly accessed on an SCell according to an embodiment of the present invention.
  • the user equipment 80 can be used to perform any of the processes in FIG. 3a to FIG. 3c to implement a blind detection restriction operation on the SCell. Random access is made to save power of the user equipment 80.
  • the user device 80 can include:
  • a user equipment UE that is randomly accessed on the secondary cell SCell, and includes: an uplink sending unit 81, configured to send a preamble preamble for random access to the base station by using the SCell;
  • the monitoring processing unit 82 is configured to monitor the common search space CSS of the SCell; a downlink receiving unit 83, configured to: after the intercepting, processing, by the intercepting processing unit 82, the scheduling information of the random access response message in the CSS, by monitoring the CSS, according to the scheduling information of the random access response message, Obtaining, by the base station, the random access response message;
  • the listening processing unit is further configured to perform any one of the following three processing procedures:
  • Process 2 After the uplink sending unit 81 successfully sends the first scheduled uplink transmission message to the base station, the CSS is stopped from being monitored; wherein the uplink sending unit 81 is further configured to be in the downlink. After receiving the random access response message, the receiving unit 83 sends the first scheduled uplink transmission message to the base station;
  • the downlink receiving unit 83 After receiving the contention resolution message sent by the base station, the downlink receiving unit 83 stops listening to the CSS; wherein the uplink sending unit 81 is further used in the downlink receiving unit 83. After the random access response message is obtained, the first scheduled uplink transmission message is sent to the base station; the downlink receiving unit 83 is further configured to successfully send the first to the base station in the uplink sending unit 81. After a scheduled uplink transmission message, the contention resolution message sent by the base station is received.
  • the user equipment 80 may perform a blind detection restriction operation in the process of performing random access on the CSS of the SCell, and when performing the restriction function in the access, the blind detection may be minimized while access is implemented. The number of times helps to save power of the user device 80.
  • the snoop processing unit 82 can be a processor.
  • the processor can be implemented in hardware.
  • the uplink receiving unit 81 may also be an interface.
  • the uplink sending unit 81, the listening processing unit 82, and the downlink receiving unit 83 can interact with the base station through an antenna port.
  • the monitoring processing unit 82 is further configured to: acquire, by using the CSS, the scheduling information of the contention resolution message in the CSS; the downlink receiving unit 83 is further configured to perform scheduling according to the contention resolution message. Information, receiving the contention sent by the base station Resolution message.
  • the listening processing unit 82 is configured to: if the transmission of the first scheduled uplink transmission message fails, intercept the CSS to obtain an uplink transmission message for the first scheduling in the CSS. Scheduling information for retransmission.
  • the monitoring processing unit 82 is further configured to monitor the dedicated search space DSS of the SCell by using the blind detection margin if there is a blind detection margin; the definition of the blind detection margin can be referred to the previous method embodiment. description of.
  • the listening processing unit 82 is configured to monitor only the CSS in the CSS and the DSS of the SCell; if the DSS of the SCell is currently being monitored, stop or suspend the SCell. DSS listens.
  • the listening processing unit 82 is further configured to start or restart monitoring the dedicated search space DSS of the SCell after stopping or suspending monitoring of the CSS.
  • the UE further includes: a blind detection limiting operation triggering unit 84, configured to: determine whether the blind detection margin is less than a preset threshold, and if the blind detection margin is less than the preset threshold, trigger the The user equipment 80 performs the function of random access in the SCell, that is, triggers the listening processing unit 82; or triggers the user equipment 80 to perform a random access function on the SCell based on the indication of the base station, that is, triggers the The processing unit 82 is monitored. If the blind detection restriction operation triggering unit 84 does not trigger the listening processing unit 82, the user equipment 80 will perform a normal random access procedure.
  • a blind detection limiting operation triggering unit 84 configured to: determine whether the blind detection margin is less than a preset threshold, and if the blind detection margin is less than the preset threshold, trigger the The user equipment 80 performs the function of random access in the SCell, that is, triggers the listening processing unit 82; or triggers the user equipment 80 to perform a random access function on the SCell
  • FIG. 9 is a schematic diagram of a base station for managing UEs randomly accessing on a SCell according to an embodiment of the present invention
  • a schematic diagram of the (eNB) 90, the base station 90 is configured to perform any of the processes in FIG. 4a to FIG. 4c, and cooperate with the UE to perform random access on the SCell by using a restricted scheduling operation, thereby saving power of the UE performing random access.
  • the base station 90 can include:
  • the downlink sending unit 91 is configured to send a random access indication message to the user equipment UE, instructing the UE to perform a random access procedure on the SCell;
  • the uplink receiving unit 92 is configured to receive, on the SCell, a preamble reamble for random access from the UE;
  • the scheduling processing unit 93 is configured to send scheduling information of the random access response message to the UE by using the common search space CSS of the SCell in response to the preamble;
  • the downlink sending unit 91 is further configured to send the random access response message to the UE according to scheduling information of the random access response message;
  • the scheduling processing unit 93 is further configured to perform any one of the following three processing procedures: Process 1: After the downlink sending unit 91 sends the random access response message, the process 2 is stopped: The uplink receiving unit 92 successfully receives the first uplink receiving unit 92 sent by the UE, and is further configured to: after the downlink sending unit 91 sends the random access response message, receive the first scheduled Uplink transmission message;
  • Process 3 After the downlink sending unit 91 sends a contention resolution message to the UE, stop sending the scheduling information of the UE to the UE on the CSS; the uplink receiving unit 92, further After receiving the random access response message, the downlink sending unit 91 is configured to receive a first scheduled uplink transmission message sent by the UE, where the downlink sending unit 91 is further configured to be in the uplink receiving unit. After successfully receiving the first scheduled uplink transmission message, the contention resolution message is sent to the UE.
  • the downlink sending unit 91, the uplink receiving unit 92, and the scheduling processing unit 93 can implement interaction with the UE through an antenna port.
  • the scheduling processing unit 93 can be a processor.
  • the processor can be implemented by hardware.
  • the downlink sending unit 91 and the uplink receiving unit 92 may be interfaces.
  • the scheduling information of the resolution message is further configured to send the contention resolution message to the UE according to the scheduling information of the contention resolution message.
  • the scheduling processing unit 93 is further configured to: if the receiving of the first scheduled uplink transmission message fails, send, to the UE, the retransmission of the first scheduled uplink transmission message on the CSS. Scheduling information.
  • the scheduling processing unit 93 is further configured to: send, by the downlink sending unit 91, an indication message of random access to the UE, or the uplink receiving unit 92 receives, on the SCell, a random connection from the UE. After the preamble preamble, the scheduling information of the user plane data or the scheduling information of the dedicated signaling transmitted to the UE on the CSS.
  • the scheduling processing unit 93 is further configured to: send, by the downlink sending unit 91, an indication message of random access to the UE, or the uplink receiving unit 92 receives, on the SCell, a random connection from the UE. After the preamble preamble, the scheduling information is transmitted or suspended on the DSS of the SCell.
  • the scheduling processing unit 93 is further configured to: send, by the downlink sending unit 91, an indication message of random access to the UE, or the uplink receiving unit 92 receives, on the SCell, a random connection from the UE. After the preamble preamble, the scheduling information of the user plane data or the scheduling information of the dedicated signaling is transmitted to the UE through the dedicated search space DSS of the SCell.
  • the scheduling processing unit 93 is further configured to: after stopping sending the scheduling information of the UE to the UE on the CSS, transmitting scheduling information of user plane data to the UE by using a dedicated search space DSS of the SCell. Or scheduling information for dedicated signaling.
  • the base station 90 may further include: a scheduling restriction operation triggering unit 94, configured to: when the preset detection condition is met, for example, if the blind detection margin of the UE is less than a preset value, the base station 90 is triggered to perform limited scheduling to minimize UE blind detection. The number of times, in particular, it can trigger the scheduling processing unit 93.
  • the scheduling restriction operation triggering unit 94 does not perform the triggering on the scheduling processing unit 93, the base station 90 will perform a scheme in which the normal management UE performs random access.
  • the base station and each unit in the UE may pass software, hardware Or a combination of hardware and software to achieve.
  • the embodiment of the present invention does not limit the specific form of the base station and the UE.
  • the UE may be a terminal in the field of wireless communication, or a device having a function of performing blind detection restriction operation in the terminal.
  • the terminal can be a device such as a mobile phone, a laptop or a tablet.
  • An operating system which may include the base station and the UE in this embodiment, by performing signaling transmission between the two parties, so that the UE can perform random access on the SCell to the base station, and reduce blind detection as much as possible. The number of times to save UE power.
  • the UE may have multiple carriers, and complete random access on the SCell in multiple carriers, so that the UE can implement random access base stations on multiple carriers respectively, which is applicable to multiple TAs. Scene.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random storage device! ⁇ Random Access Memory (RAM), etc.

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Abstract

La présente invention porte sur le domaine technique des communications. L'invention porte sur un procédé et un dispositif d'accès aléatoire à une cellule secondaire (SCell), le procédé comprenant : la transmission d'un préambule d'accès aléatoire à un eNB par l'intermédiaire de la SCell; la surveillance de l'espace de recherche commun (CSS) de la SCell; après que les informations de programmation d'une réponse d'accès aléatoire sont obtenues dans le CSS par surveillance du CSS, l'obtention de la réponse d'accès aléatoire à partir du eNB conformément aux informations de programmation de la réponse d'accès aléatoire; après que la réponse d'accès aléatoire est obtenue, ou après qu'un premier message de transmission de liaison montante programmé est transmis avec succès à l'eNB, ou après qu'un message de résolution de contention est reçu, l'arrêt de la surveillance du CSS. La solution technique peut réduire le nombre de fois d'une détection à l'aveugle d'UE, permettant ainsi d'économiser l'énergie de l'UE.
PCT/CN2012/078854 2011-08-09 2012-07-19 Procédé et dispositif d'accès aléatoire à une cellule secondaire WO2013020443A1 (fr)

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