WO2013016988A1 - Procédé et système d'accès aléatoire non basé sur la résolution de conflits, élément de réseau sur le côté réseau et équipement d'utilisateur - Google Patents

Procédé et système d'accès aléatoire non basé sur la résolution de conflits, élément de réseau sur le côté réseau et équipement d'utilisateur Download PDF

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Publication number
WO2013016988A1
WO2013016988A1 PCT/CN2012/077380 CN2012077380W WO2013016988A1 WO 2013016988 A1 WO2013016988 A1 WO 2013016988A1 CN 2012077380 W CN2012077380 W CN 2012077380W WO 2013016988 A1 WO2013016988 A1 WO 2013016988A1
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Prior art keywords
random access
cell
information
grant
mac
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PCT/CN2012/077380
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English (en)
Chinese (zh)
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陈中明
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中兴通讯股份有限公司
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Publication of WO2013016988A1 publication Critical patent/WO2013016988A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a secondary serving cell access technology, and in particular, to a method and system for non-conflicting random access, a network side network element, and a user equipment. Background technique
  • a random access procedure for an idle state (RRC_IDLE) UE (or user equipment (UE)) initial access network, or a connection state (RRC_CONNECTED) UE Uplink synchronization with the network and acquisition of resource allocation for subsequent data communication.
  • RRC_IDLE idle state
  • UE user equipment
  • RRC_CONNECTED connection state
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • 3GPP Third Generation Partnership Project
  • LTE Long Term Evolution
  • the event may trigger the random access procedure of the UE: (1) idle state initial access; (2) RRC Connection Re-establishment procedure; (3) handover (HO, Handover); (4) RRC connection status downlink data arrival requires a random access procedure, for example, when the uplink synchronization status is "non-synchronized”; (5) RRC connection status uplink data arrival requires a random access procedure, for example, when the uplink synchronization status is "unsynchronized” or There is no physical uplink control channel (PUCCH, Physical Uplink Control Channel) resource transmission scheduling request (SR, Schedule Request); (6) RRC connection status requires random access procedure for positioning purposes, for example, UE positioning requires timing advance (Timing Advance ).
  • PUCCH Physical Uplink Control Channel
  • SR Schedule Request
  • RRC connection status requires random access procedure for positioning purposes, for example, UE positioning requires timing advance (Timing Advance ).
  • the random access process has two different forms: Contention Based (for the first five events mentioned above); Non-Contention Based (for the above (3), (4), (6) Event).
  • the random access procedure may be initiated by physical downlink control channel signaling (PDCCH order) or a media access control layer (MAC) of the UE, optionally, PDCCH order or radio resource control (RRC, Radio Resource Control).
  • the signaling may allocate a dedicated random access preamble to the UE, and the random access procedure is a non-collision-based manner; otherwise, the UE needs to select a random access preamble, and the random access procedure is a conflict-based manner.
  • the UE selecting the random access resource includes selecting a random access preamble and a time-frequency domain resource of a Physical Random Access Channel (PRACH).
  • PRACH Physical Random Access Channel
  • Figure 1 is a schematic diagram of an existing random access procedure. As shown in Figure 1, the contention based random access procedure mainly includes the following steps:
  • Step 101 The UE sends a random access preamble through a random access channel (RACH, Random Access CHannel).
  • RACH Random Access CHannel
  • the timing of the UE sending the random access preamble is configured in a system message broadcast, and the main configuration is frequency. Domain and time domain resources, where the frequency domain is configured with rach-FreqOffset (frequency offset of PRACH), and the time domain is configured with prach-Configlndex (which subframes on PRACH can send random access preambles).
  • Step 102 A medium access control layer (MAC) of the base station (eNB) generates a random access response message and sends the message to the UE on a downlink shared channel (DL-SCH, Downlink-Shared Channel); the random access response
  • the message includes at least a random access preamble ID (RAPID), a time adjustment (TA, Time Alignment) information, an initial uplink grant (UL Grant, Uplink Grant), and a temporary cell-wireless network temporary identifier (Temporary C- RNTI);
  • the random access response message is indicated by a random access-Radio Network Temporary Identifier (RA-RNTI) on the physical downlink control channel (PDCCH, Phisical Downlink Control CHannel);
  • the uplink grant indicates the frequency domain information of the uplink data sent by the UE and the required configuration information, such as power control.
  • Step 103 The UE sends a first scheduled transmission (UL-SCH, Uplink-Shared Channel) message, where the content of the scheduled transmission message includes at least a cell-wireless network temporary identifier (C- RNTI), a Media Control Element (MAC Control Element) or a Common Control Logical Channel Service Data Unit (CCCH SDU) including a Contention Resolution Identity; the transmission of the scheduled transmission message supports a hybrid automatic repeat request ( HARQ, Hybrid Automatic Retransmission reQuest).
  • C- RNTI cell-wireless network temporary identifier
  • MAC Control Element Media Control Element
  • CCCH SDU Common Control Logical Channel Service Data Unit
  • Step 104 The base station sends a contention resolution message on the DL-SCH.
  • the conflict resolution message is indicated by a C-RNTI or a temporary C-RNTI on the PDCCH, and may include a conflict resolution identifier.
  • the message is sent to support HARQ.
  • the above steps 103 and 104 are used to resolve the conflict.
  • the RRC connection state downlink data arrival requires a random access procedure
  • the RRC connection state uplink data arrival requires a random access procedure, which triggers the Scdl execution.
  • the random access procedure but does not preclude other events from triggering the Scdl to perform a random access procedure, such as when the Scdl is activated, triggering the execution of the random access procedure.
  • LTE-A Long Term Evolution
  • CA Carrier Aggregation
  • CC component carriers
  • Component Carriers component carriers
  • the initial stage UL CC The total number of configurations is less than or equal to the total configuration of the DL CC.
  • An LTE-A UE with carrier aggregation capability can transmit and receive data on multiple component carriers at the same time.
  • the UEs referred to below refer to such UEs unless otherwise specified.
  • the UE can communicate with the source base station through multiple component carriers (such as CC1 and CC2) at the same time.
  • the base station will specify one for the UE through explicit configuration or according to the protocol.
  • the primary component carrier (PCC, Primary Component Carrier)
  • the other component carrier is called the secondary component carrier (SCC)
  • the serving cell on the PCC is called the primary serving cell (Pcdl, Primary Cell), on the SCC.
  • cell service called secondary serving cell (Scdl, secondary cell) 0 is a secondary serving cell after the UE enters the connected state of the base station configuration.
  • a serving cell has symmetric uplink and downlink (Scdl can only configure downlink). It is clearly indicated in the system information block SIB2 that in order to avoid interference of the control channel, the concept of cross-carrier scheduling is introduced, that is, when If the PDCCH interference of a certain Scdl is severe, the PDCCH of the Scdl is not enabled, but the PDSCH of the Scdl is scheduled by another serving cell, where another serving cell can be configured through RRC signaling.
  • the base station only allocates one C-RNTI to the UE, that is, the C-RNTI of each serving cell is the same.
  • the number of Scdl is less than one, and the scenario is limited to that if the uplink RRH and the repeater are not supported, only one TA exists, and the UE only needs to initiate uplink synchronization in the Pcdl. It will not be launched on Scdl.
  • the number of Scdl will increase to four, and the scene will be relaxed. For example, the uplink RRH and repeater are supported. At this time, one TA will not solve the problem, so multiple TAs will be introduced.
  • the uplink synchronization is also initiated on the Scdl, and the random access process is performed after the Scdl is activated.
  • the Scdl must perform normal uplink data transmission and reception after the uplink synchronization is completed. If the non-conflicting random access procedure is performed on the Scdl, the time is relatively short. If the conflicting random access procedure is performed, the time will be longer. In order to improve the user experience, it is necessary to select a non-contention random access procedure to perform data transmission and reception as soon as possible for the random access procedure on the Scdl. If the dedicated preamble resources are missing or insufficient, the Scdl access is inevitably increased. Therefore, it is necessary to shorten the random access process of Scdl and speed up user access. Summary of the invention
  • the main purpose of the present invention is to provide a non-conflicting random access method and system, a network side network element, and a user equipment, which can implement fast access of the Scdl.
  • the technical solution of the present invention is achieved as follows:
  • a method for non-conflicting random access comprising:
  • the TA is fed back by the network side according to the received random access preamble or uplink data calculation.
  • the random access occasion information or the UL grant information of the cell in which the MAC CE is set is:
  • the MAC CE is configured with a cell that carries the identification information of the cell, and a cell that carries the random access timing information or the UL grant information, where
  • the bit carrying the identification information of the cell has a fixed correspondence with the bit carrying the random access occasion information or the UL grant information;
  • the random access opportunity information or the UL grant information in the cell sequentially corresponds to the valid identifier of the cell.
  • the valid identifier of the cell is:
  • the bit indicating the cell to be activated is "1", and the identifier of the cell is valid.
  • the random access occasion information or the UL grant information of the cell in which the MAC CE is set is:
  • the MAC CE is configured with a cell that carries random access opportunity information or UL grant information, and is used to indicate the current cell.
  • the random access opportunity is a subframe in a radio frame.
  • the random access opportunity is the random access opportunity in the current frame or the next frame The specified subframe.
  • the network side is a base station.
  • a method for non-conflicting random access comprising:
  • the network side sends a MAC CE to the UE, where the MAC CE is provided with the random access opportunity information of the cell or the uplink grant UL grant information;
  • the network side sends a random access preamble or uplink on the cell according to the timing of the UL grant indication according to the random access preamble sent by the UE on the cell at a random access occasion.
  • Data calculating the TA and feeding back to the UE to enable the UE to access the cell.
  • the random access occasion information or the UL grant information of the cell in which the MAC CE is set is:
  • the MAC CE is configured with a cell that carries the identification information of the cell, and a cell that carries the random access timing information or the UL grant information, where
  • the bit carrying the identification information of the cell has a fixed correspondence with the bit carrying the random access occasion information or the UL grant information;
  • the random access opportunity information or the UL grant information in the cell sequentially corresponds to the valid identifier of the cell.
  • the random access occasion information or the UL grant information of the cell in which the MAC CE is set is:
  • the MAC CE is configured with a cell that carries random access opportunity information or UL grant information, and is used to indicate the current cell.
  • the random access opportunity is a subframe in a radio frame
  • the random access occasion is a subframe specified by the random access occasion in the current frame or the next frame.
  • a non-conflicting random access system including a UE and a network side, where a network side, configured to send a MAC CE to the UE, where the MAC CE is configured with random access timing information or UL grant information of the cell; and, according to the received random access preamble or uplink data, a time adjustment TA, And feeding back to the UE, activating the cell;
  • a UE configured to send a random access preamble on the cell according to the random access occasion, or send a random access preamble or uplink data on the cell at a timing indicated by the UL grant;
  • the TA fed back by the network side accesses the cell.
  • the network side is further configured to calculate a feedback TA according to the received random access preamble or uplink data.
  • the MAC CE is provided with a cell carrying the identity information of the cell and a cell carrying the random access opportunity information or the UL grant information, where
  • the bit carrying the identification information of the cell has a fixed correspondence with the bit carrying the random access occasion information or the UL grant information; or the random access timing information or the UL in the cell
  • the grant information sequentially corresponds to the valid identifier of the cell
  • the MAC CE is configured with a cell that carries random access opportunity information or UL grant information, and is used to indicate the set cell.
  • the random access occasion or the timing indicated by the UL grant is a subframe in a frame.
  • the random access occasion or the timing indicated by the UL grant is a subframe after the first subframe in the current frame or the next frame.
  • a network side network element including a receiving unit, a calculating unit, and a sending unit, where the receiving unit is configured to receive random access preamble or uplink data sent by the UE;
  • a calculation unit configured to calculate a TA
  • a sending unit configured to send the TA to the UE, and send a MAC CE to the UE, where the MAC CE is configured with random access occasion information or UL grant information of the cell.
  • a user equipment including a sending unit and an access unit, where a sending unit, configured to send a random access preamble on the cell at a random access occasion of the cell, or send a random access preamble or uplink data on the cell at a timing indicated by the UL grant;
  • the access unit is configured to access the cell after receiving the TA sent by the network side.
  • the media access control control unit (MAC CE) is extended, and the random access timing information or the UL grant information indicating the cell is set, so that the base station notifies the random cell of the cell through the MAC CE.
  • An access opportunity or a UL grant the UE sends a random access preamble on the cell according to the random access occasion, or sends a random access preamble or uplink data on the cell at the timing indicated by the UL grant;
  • the time adjustment TA is calculated according to the received random access preamble or uplink data, and is fed back to the UE.
  • the UE After receiving the UE, the UE successfully accesses the cell, and can perform normal data transmission and reception in the cell.
  • the invention can realize the access of the secondary serving cell through the non-contention mode, greatly shortens the time of the cell access, and satisfies the requirement that the UE can quickly send and receive a large amount of data.
  • FIG. 1 is a schematic diagram of an existing random access process
  • FIG. 2 is a schematic diagram of an existing MAC CE
  • FIG. 3 is a schematic diagram of a MAC CE of the present invention.
  • FIG. 4 is a schematic diagram of a MAC CE of the present invention.
  • Figure 5 is a schematic diagram of a MAC CE of the present invention.
  • FIG. 6 is a schematic diagram of a MAC CE according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic diagram of a MAC CE according to Embodiment 2 of the present invention.
  • FIG. 8a is a schematic diagram of a MAC CE according to Embodiment 3 of the present invention.
  • FIG. 8b is a schematic diagram of a MAC CE according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic diagram of a MAC CE according to Embodiment 4 of the present invention.
  • FIG. 10 is a schematic diagram of a MAC CE according to Embodiment 5 of the present invention
  • FIG. 11 is a schematic structural diagram of a network side network element according to an embodiment of the present invention
  • FIG. 12 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. detailed description
  • the basic idea of the present invention is to set a random access timing information or UL grant information indicating a cell to be transmitted by extending a Media Access Control Element (MAC CE), so that the base station notifies by MAC CE.
  • MAC CE Media Access Control Control Element
  • a random access occasion or a UL grant of the cell where the UE sends a random access preamble or uplink data according to the timing indicated by the random access occasion or the UL grant; the base station calculates according to the received random access preamble or uplink data.
  • the time adjustment TA is performed and fed back to the UE. After receiving the UE, the UE considers that the access is successful, and can perform normal data transmission and reception in the cell.
  • the introduction of Scdl is to increase the traffic rate.
  • an activation deactivation mechanism is also introduced for Scdl, and the deactivation mechanism is activated in order to make the Scell be utilized as soon as possible.
  • the non-conflicting random access procedure is implemented by the network side UE for allocating a dedicated preamble. If the dedicated preamble resource is missing, only the conflicting random access procedure can be used, or the available dedicated preamble resources are waiting for the two. The approach will bring a certain delay, which is obviously contrary to the fundamental purpose of Scdl activation.
  • the present invention is directed to the above-mentioned deficiencies.
  • the main technical solution is that the network side provides a dedicated manner for transmitting a random access preamble opportunity to the UE, and the UE sends a random access preamble to perform a non-conflicting random access procedure at a specified timing, thereby effectively replenishing the Scdl.
  • Ci indicates a Scdl identifier that needs to be activated or deactivated.
  • Ci indicates that the Scell indicated by Ci needs to be activated.
  • Ci Indicates that ScelL needs to be deactivated for Ci indication
  • the present invention is directed to the MAC.
  • the CE is extended.
  • the MAC CE is configured with a cell that carries the identity information of the cell, or a cell that carries the random access opportunity information or the UL grant information, where
  • the MAC CE includes both the cell identity information and the random access preamble or the UL grant information, the bit carrying the identity information of the cell and the bit carrying the random access opportunity information or the UL grant information Have a fixed correspondence;
  • the random access opportunity information or the UL grant information in the cell sequentially corresponds to the valid identifier of the cell.
  • the random access preamble or UL grant information only corresponds to the cell that receives the MAC CE.
  • Subframe1 to Subframe7 respectively indicate that a random access preamble is sent when a Scell with cell identifiers 1 to 7 performs random access, and Subframe1 to Subframe7 and a cell identifier are 1 to 7.
  • the Scell has a corresponding relationship.
  • the cell carrying the random access timing information may be set to a variable bit manner. When two cells are required to be activated, only the random access timing information of the two cells is carried, and the two random numbers are randomly selected.
  • the access timing information may be sequentially corresponding to the two cells of the cell to be activated.
  • UL grant1 to UL grant 7 respectively indicate uplink grants for transmitting random access preamble or uplink data when a cell with cell identifiers 1 to 7 performs random access, UL.
  • the grant1 to UL grant 7 has a corresponding relationship with the Scell whose cell identifiers are 1 to 7.
  • the cell carrying the uplink grant may be set to a bit-variable manner.
  • the UL grant information of only two cells may be carried.
  • the two UL grants may be used.
  • the information and the two cells of the above-mentioned cell to be activated may be sequentially applied.
  • FIG. 5 is a schematic diagram of a MAC CE according to the present invention. As shown in FIG. 5, only one cell carrying random access timing information or uplink grant information is added to the MAC CE, where the Subframe indicates that the designated Scell is randomly selected and sent randomly. When entering the predecessor, ULgrant means to specify Scell The uplink grant of the random access preamble is sent when random access is performed.
  • the base station 1 is a base station having carrier aggregation capability.
  • Base station 1 is under the jurisdiction
  • the user equipment UE1 accesses the network through the base station 1 (or the network switches the UE to the base station 1), and the base station 1 configures three simultaneously working cells (Cell, Cdl2, and Cell3) according to the capability of the UE1, where the Celll provides the UE1.
  • the NAS layer mobility information such as the PLMN, the global cell identifier CGI, and the location area identifier TAC, is the primary cell (Pcdl, Primary Cell) of the UE1, or the primary serving cell, and the UE1 only receives the system message and the paging message of the primary cell.
  • Cdll and Cdl2 can be RRH cells, or pass repeater, or ordinary cells.
  • the cell IDs of Celll, Cdl2, and Cdl3 are 0, 1, and 2, respectively. These three cells are FDD. For the TDD cell, the process is the same and will not be repeated.
  • Cdl3 is itself scheduling itself.
  • Step 1 The base station sends a MAC CE to the UE.
  • 6 is a schematic diagram of a MAC CE according to Embodiment 1 of the present invention.
  • a MAC CE includes a command to activate Cdl3 and a timing to allow a random access preamble to be transmitted, such as subframe 5, after receiving a command by the UE. Activating Cdl3 and transmitting a common random access preamble in subframe 5 of the most recent radio frame;
  • Step 2 The base station receives the public random access preamble, calculates a TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cell3, where the message includes the TA; the message passes through the Cdl3.
  • the RA-RNTI (or C-RNTI) on the PDCCH is indicated;
  • Step 3 After obtaining the TA, the UE considers that the Cdl3 access is successful, and can normally send and receive data on the Cdl3, and automatically prohibits sending the random access preamble on the subframe 5.
  • Cdl2 and Cell3 are themselves scheduling themselves.
  • Step 1 The base station sends a MAC CE to the UE.
  • FIG. 7 is a schematic diagram of a MAC CE according to Embodiment 2 of the present invention.
  • the MAC CE includes a command to activate Cell2 and Cdl3, and includes a Cdl2 permission to send.
  • the timing of random access preamble, such as subframe 5 and Cdl3, is allowed to transmit the random access preamble timing, such as subframe 3.
  • the UE activates Cdl2 and Cdl3, and passes through subframe 3 of the latest radio frame.
  • Cell3 transmits a common random access preamble, and transmits a common random access preamble through Cdl2 on subframe 5 of the latest radio frame;
  • Step 2 The base station receives the common random access preamble on the Cdl2, calculates the TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cdl2, where the message includes the TA; the message passes the RA-RNTI on the PDCCH on the Cdl2 ( Or C-RNTI) to indicate;
  • Step 3 The base station receives the common random access preamble on the Cdl3, calculates the TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cdl3, where the message includes the TA; the message passes the RA-RNTI on the PDCCH on the Cdl3 ( Or C-RNTI) to indicate;
  • Step 4 After obtaining the TA, the UE considers that Cell 2 and Cell 3 are successfully accessed, can normally send and receive data on Cdl2 and Cdl3, and automatically prohibits sending random access on subframe 3 and subframe 5.
  • Cdl2 and Cdl3 are themselves scheduling themselves.
  • Step 1 The base station sends a MAC CE to the UE.
  • FIG. 8a is a schematic diagram of the MAC CE according to the third embodiment of the present invention.
  • the MAC CE includes a command to activate Cell2, and includes the uplink authorization of the UE in Cell2.
  • the uplink grant on Cell3 the UE may send random access preamble or uplink data at the time of uplink grant.
  • the UE activates Cdl2 and Cell3 respectively, and sends the common random access preamble or uplink data in the uplink authorized subframe respectively.
  • Step 2 The base station receives the public random access preamble or uplink data on Cdl2, and calculates The TA, the generated response message is sent to the UE in the DL-SCH of the Cdl2, where the message includes the TA; the message is indicated by the RA-RNTI (or C-RNTI) on the PDCCH on the Cell2;
  • Step 3 The base station receives the common random access preamble or uplink data on the Cell3, calculates the TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cdl3, where the message includes the TA; the message passes the RA on the PDCCH on the Cell3. - RNTI (or C-RNTI) for indication;
  • Step 4 After obtaining the TA, the UE considers that Cell2 and Cell3 are successfully accessed, and can normally send and receive data on Cdl2 and Cdl3.
  • FIG. 8b is a schematic diagram of a MAC CE according to Embodiment 3 of the present invention. As shown in FIG. 8b, in this example, a MAC CE structure is shown in FIG. 8b, and the uplink authorization is for Cell3.
  • Cell2 is scheduled by Pcell.
  • Step 1 The UE has uplink data arrives, and the amount of data is relatively large. At this time, Cdl2 is in an out-of-synchronization state, and has been deactivated. The UE learns that Cdl2 and Cdll need to adopt different TAs according to the pre-configuration information of the base station, and needs to acquire the TA on Cdl2.
  • Step 2 The UE notifies the base station through the Pcdl, needs to activate the Cdl2, or needs to perform the process of acquiring the TA on the Cdl2; and may include the cell identifier that needs to be activated or needs to acquire the TA.
  • Step 3 The base station sends a MAC CE to the UE, and includes a command to activate the Cell2, and the UE activates the Cell2 after receiving the command;
  • Step 4 The base station sends the MAC CE to the UE through the Cdl2.
  • FIG. 9 is a schematic diagram of the MAC CE according to the fourth embodiment of the present invention. As shown in FIG. 9, in this example, the timing of allowing the random access preamble to be sent on the Cdl2 in the MAC CE is as follows. Frame 5, and transmits a common random access preamble in subframe 5 of the most recent radio frame.
  • Step 5 The base station receives the common random access preamble, calculates the TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cdl2, where the message includes the TA, and may also include an uplink grant; the message passes the Cell2 related PDCCH on the Pcdl.
  • the RA-RNTI (or C-RNTI) on the indication is given;
  • Step 6 after obtaining the TA, the UE considers that the Cdl2 access is successful, and can normally send and receive data on the Cdl2, and automatically prohibits sending the random access preamble on the subframe 5.
  • Cell2 is scheduled by Pcdl.
  • Step 1 The UE has downlink data arriving, and the amount of data is relatively large. At this time, Cdl2 is in an out-of-synchronization state, and has been deactivated. The base station notifies the UE that the cell Cdl2 and the Cdll need to adopt different TAs, and needs to perform the process of acquiring the TA on the Cell2. When the UE activates the Cell2 by itself;
  • Step 2 The base station sends a MAC CE to the UE.
  • FIG. 10 is a schematic diagram of a MAC CE according to Embodiment 5 of the present invention.
  • the MAC CE notifies the UE of the uplink grant on Cdl2, and the UE may be authorized in the uplink.
  • the timing sends random access preamble or uplink data.
  • the UE activates Cdl2 and sends public random access preamble or uplink data in the uplink authorized subframe.
  • Step 3 The base station receives the public random access preamble or uplink data on Cdl2, and calculates the TA. Generating a response message to the UE on the DL-SCH related to the Cdl2 on the Pcell, where the message includes the TA; the message is indicated by the RA-RNTI (or C-RNTI) on the PDCCH on the Cell2;
  • Step 4 After obtaining the TA, the UE considers that the Cdl2 access is successful, and may be on the Cdl2.
  • the downlink data is received on the DL-SCH and normal feedback is performed.
  • the present invention also describes a non-conflicting random access system, including a UE and a network side, where the network side is configured to send a MAC CE to the UE, where the MAC CE is set with a random access occasion of the cell to be activated.
  • Information or UL grant information ; and, calculating a time adjustment TA according to the received random access preamble or uplink data, and feeding back to the UE, activating the to-be-activated cell;
  • the UE is configured to send a random access preamble on the to-be-activated cell according to the random access occasion, or send a random access preamble or uplink data on the to-be-activated cell at the timing indicated by the UL grant.
  • non-conflicting random access system of the present invention does not improve the structure of the existing communication network, and only improves the functions and interaction modes of some network elements, and will be improved below. Partially detailed description.
  • the MAC CE is configured with a cell that carries the identification information of the cell to be activated, and a cell that carries the random access opportunity information or the UL grant information, where
  • the bit that carries the identification information of the to-be-activated cell has a fixed correspondence with the bit that carries the random access occasion information or the UL grant information; or, the random access opportunity information or the location in the cell
  • the UL grant information sequentially corresponds to the valid identifier of the to-be-activated cell
  • the MAC CE is configured with a cell that carries random access opportunity information or UL grant information, and is used to indicate the set cell.
  • the timing of the random access occasion or the UL grant indication is a subframe in a frame.
  • the timing of the random access occasion or the UL grant indication is a subframe after the first subframe in the current frame or the next frame.
  • FIG. 11 is a schematic structural diagram of a network side network element according to an embodiment of the present invention.
  • the network side network element of the present invention includes a receiving unit 110, a calculating unit 111, and a sending unit 112.
  • the receiving unit 110 is configured to receive the random access preamble or uplink data sent by the UE, and the calculating unit 111 is configured to calculate the TA;
  • the sending unit 112 is configured to send the TA to the UE, and send a MAC CE to the UE.
  • the MAC CE is configured with random access timing information or UL grant information of the cell.
  • the above network side network element mainly refers to a base station.
  • FIG. 12 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment of the present invention includes a sending unit 120 and an access unit 121, where
  • the sending unit 120 is configured to send a random access preamble on the cell at a random access occasion of the cell, or send random access preamble or uplink data on the cell at the timing indicated by the UL grant;
  • the access unit 121 is configured to access the cell after receiving the TA sent by the network side.
  • the above network side network element mainly refers to a base station.
  • the MAC CE by extending the MAC CE, setting the random access timing information or the UL grant information indicating the cell, so that the base station notifies the random access occasion or the UL grant of the cell through the MAC CE, and the UE according to the random access
  • the timing is to send a random access preamble on the cell, or send random access preamble or uplink data on the cell at the timing indicated by the UL grant; the base station calculates time adjustment according to the received random access preamble or uplink data.
  • the TA is fed back to the UE. After receiving the UE, the UE successfully accesses the cell, and can perform normal data transmission and reception in the cell.

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

Abstract

La présente invention se rapporte à un procédé d'accès aléatoire non basé sur la résolution de conflits. Le procédé selon l'invention comprend les étapes suivantes : un côté réseau transmet à un équipement d'utilisateur (UE, User Equipment) un élément de commande de contrôle d'accès au support (MAC CE, Media Access Control Control Element), le MAC CE étant configuré avec des données de synchronisation d'accès aléatoire d'une cellule ou avec des données d'autorisation à émettre sur la liaison montante (UL grant) correspondantes ; l'UE transmet, sur la cellule, un préambule d'accès aléatoire sur la base des données de synchronisation d'accès aléatoire, ou bien il transmet, sur la cellule, le préambule d'accès aléatoire ou des données sur la liaison montante à un instant de synchronisation notifié par l'autorisation à émettre sur la liaison montante (UL grant) ; le côté réseau calcule une valeur d'ajustement temporel (TA) sur la base du préambule d'accès aléatoire ou des données sur la liaison montante qui ont été reçus, et il la retransmet à l'UE ; enfin, l'UE accède effectivement à la cellule. De ce fait, l'UE est autorisé à accomplir une transmission et une réception de données normalement. La présente invention se rapporte d'autre part à un système, à un élément de réseau sur le côté réseau et à un équipement d'utilisateur pour la réalisation effective d'un accès aléatoire non basé sur la résolution de conflits. En rendant l'accès à une cellule de service auxiliaire possible par le biais de moyens non basés sur la résolution de conflits, la présente invention réduit considérablement le temps qu'il faut à l'UE pour accéder à la cellule. La solution technique décrite dans la présente invention est ainsi apte à répondre aux exigences de l'UE en termes de rapidité de réception et de transmission d'une grande quantité de données.
PCT/CN2012/077380 2011-08-01 2012-06-21 Procédé et système d'accès aléatoire non basé sur la résolution de conflits, élément de réseau sur le côté réseau et équipement d'utilisateur WO2013016988A1 (fr)

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CN106664714B (zh) * 2014-08-26 2020-05-08 瑞典爱立信有限公司 蜂窝网络中周期性上行链路许可对准
EP3277036B1 (fr) 2015-05-15 2020-03-25 Huawei Technologies Co., Ltd. Procédé de communication et dispositif de communication
WO2018119754A1 (fr) * 2016-12-28 2018-07-05 Motorola Mobility Llc Indicateur de faisceau de transmission
CN109392061B (zh) * 2017-08-11 2022-08-09 中兴通讯股份有限公司 一种数据传输方法及装置、计算机可读存储介质
CN110312309B (zh) * 2018-03-27 2021-12-31 华为技术有限公司 一种随机接入的方法及装置
CN110876205B (zh) 2018-08-31 2022-02-11 展讯通信（上海）有限公司 Ro的指示、确定方法及装置、存储介质、基站、终端
CN111726884B (zh) * 2019-03-20 2022-06-07 中国移动通信有限公司研究院 一种指示方法及设备
WO2021056170A1 (fr) * 2019-09-24 2021-04-01 Qualcomm Incorporated Configuration d'accès aléatoire inter-porteuses
CN112788777B (zh) * 2019-11-07 2023-04-28 华为技术有限公司 适用于卫星网络的随机接入前导配置方法及装置

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