WO2013004084A1 - 辅服务小区随机接入的方法和用户设备 - Google Patents

辅服务小区随机接入的方法和用户设备 Download PDF

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Publication number
WO2013004084A1
WO2013004084A1 PCT/CN2012/071350 CN2012071350W WO2013004084A1 WO 2013004084 A1 WO2013004084 A1 WO 2013004084A1 CN 2012071350 W CN2012071350 W CN 2012071350W WO 2013004084 A1 WO2013004084 A1 WO 2013004084A1
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Prior art keywords
message
user equipment
serving cell
conflict resolution
random access
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PCT/CN2012/071350
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English (en)
French (fr)
Inventor
陈中明
杜忠达
黄亚达
刘扬
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中兴通讯股份有限公司
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Publication of WO2013004084A1 publication Critical patent/WO2013004084A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access, e.g. scheduled or random access
    • H04W74/08Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/04Error control

Definitions

  • the present invention relates to the field of communications, and in particular to a method and user equipment for random access of a secondary serving cell.
  • a random access procedure (RRC User Procedure) for an idle state (RRC_IDLE) initially accesses a network, or a connection state (RRC_CO NECTED)
  • RRC_CO NECTED a connection state
  • the terminal performs uplink synchronization with the network and acquires resource allocation for subsequent data communication.
  • E-UTRAN evolved universal terrestrial radio access network
  • LTE Long Term Evolution
  • HO Handover
  • RRC connection status downlink data arrival required Random access procedure for example, when the uplink synchronization state is "unsynchronized”
  • RRC connection state uplink data arrival requires a random access procedure, for example, when the uplink synchronization state is "unsynchronized” or there is no available physical uplink control channel (PUCCH, Physical Uplink Control Channel)
  • PUCCH Physical Uplink Control Channel
  • SR Schedule Request
  • the RRC connection state requires a random access procedure for positioning purposes, for example, UE positioning requires timing advance (TA, 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 a Physical Downlink Control Channel Order (PDCCH order) or a Media Access Control Layer (MAC) of the UE, optionally, PDCCH order or radio resource control (
  • the RRC (Radio Resource Control) 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 For a conflict-based approach.
  • Selecting a random access resource by the UE includes selecting a time-frequency domain resource such as a random access preamble and a physical random access channel (PRACH).
  • LTE-A Long Term Evolution Advance
  • CA Carrier Aggregation
  • Large broadband increasing the peak rate of the UE.
  • the maximum downlink transmission bandwidth supported by the system is 20MHz.
  • Carrier aggregation is to aggregate two or more component carriers (CC) to support a transmission bandwidth greater than 20MHz and a maximum of 100MHz.
  • 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 involved below are all such UEs unless otherwise specified.
  • the UE after the UE enters the connected state, it can communicate with the source base station through multiple component carriers (such as CC1, CC2) at the same time, and the source base station specifies a primary component carrier for the UE through explicit configuration or according to the protocol.
  • the primary component carrier (PCC) the other component carrier is called the secondary component carrier (SCO)
  • the serving cell on the PCC is called the primary cell (Pcell)
  • the serving cell on the SCC is called the secondary cell.
  • the secondary cell (Scell) 0 is configured by the base station after the UE enters the connected state.
  • a certain serving cell has symmetric uplink and downlink (Scell can only be configured with downlink), in SIB2. It is explicitly pointed out that in order to avoid the interference of the control channel, the concept of cross-carrier scheduling is introduced, that is, when the PDCCH interference of a certain Scell is relatively serious, the PDCCH of the Scell is not enabled, but is scheduled by another serving cell.
  • the PDSCH of the Scell where another serving cell can be configured through RRC signaling.
  • the base station allocates only one C-RNTI for one UE, ie each The C-RNTI of the serving cell is the same.
  • the base station can activate/deactivate an SCell by displaying a command (MAC CE), and the PCell cannot be activated/deactivated.
  • Data reception is performed only on the activated carrier, such as monitoring of the Physical Downlink Control Channel (PDCCH), sending SRS (Sounding Reference Symbols) and CQI (Channel Quality Indicator) / PMI (Precoding Matrix Index) / RI (Rank Indicator);
  • the base station deactivates these carriers by displaying command notifications or implicit rules.
  • the UE does not monitor the PDCCH channel and does not receive the physical downlink shared channel (Physical Downlink).
  • the data on the Shared Channel, PDSCH), does not send SRS, does not report CQI/PMI/RL, does not send uplink data, thus achieving power saving.
  • the number of Scells is relatively small (for example, only 1), and the scene is also limited, for example, does not support the uplink radio remote (RRH) and repeater (repeate r), therefore, there is only one TA.
  • the UE only needs to initiate uplink synchronization on the Pcell, and the Scell does not initiate.
  • the number of Scells increases (for example, to four), and the scene is also relaxed. For example, the uplink RRH and repeater are supported.
  • the TA cannot solve the problem, so multiple time adjustment information is introduced. , Time Alignment ) o
  • the uplink synchronization will also be initiated on the Scell, and after the Scell is activated, The random access process is performed.
  • the UE may schedule the DL data of the Scell (indicated by the C-RNTI) while waiting for the collision resolution message (msg4), then the problem exists: If the UE receives the DL data scheduling and may be mistaken for receiving the conflict resolution message (msg4), the UE considers that the conflict is successfully resolved. In fact, the conflict is not resolved at this time, causing the UE and the base station to resolve the conflict.
  • the base station considers that the uplink synchronization on the Scell is not successful but the UE considers that the UE is successful.
  • the UE starts to send the uplink SRS on the Scell, and reporting the CQI/PMI/RL will cause great interference to other UEs, causing conflicts between the UEs.
  • an effective solution has not been proposed yet.
  • the present invention provides a method and user equipment for random access of a secondary serving cell, so as to at least solve the conflict problem in the random access procedure of the foregoing Scell.
  • a method for random access of a secondary serving cell including: when a user equipment performs random access on a secondary serving cell, after receiving the first scheduled transmission message, receiving the secondary service a message of the cell; the user equipment checks whether the message includes the C-RNTI of the serving cell; if the C-RNTI is included, the user equipment determines whether the message is a conflict resolution message; if it is a conflict resolution message, the user equipment determines that the conflict is resolved, and determines the auxiliary The serving cell access process is successfully completed.
  • Whether the user equipment determines whether the message is a conflict resolution message includes: the user equipment determines whether the message carries a downlink allocation indication; if the downlink allocation indication is carried, the user equipment determines that the message is not a conflict resolution message; if the downlink allocation indication is not carried, the user equipment determines The message is a conflict resolution message. Whether the user equipment determines whether the message is a conflict resolution message includes: when the message carries an uplink authorization indication, the user equipment determines that the message is a conflict resolution message. Whether the user equipment determines whether the message is a conflict resolution message includes: when the message carries an uplink grant indication and a fill indication, the user equipment determines that the message is a conflict resolution message.
  • the triggering manner of the foregoing process for the user equipment to perform random access on the secondary serving cell includes the following: the user equipment receives the secondary serving cell access notification of the base station; the user equipment determines the primary serving cell and the secondary service according to the information pre-configured by the base station The cell uses different TAs to determine to perform uplink synchronization on the secondary serving cell.
  • the above method further includes: if the message is not a conflict resolution message, after receiving the message, the user equipment continues to wait to receive the next message.
  • a user equipment including: a message receiving module, configured to receive a secondary serving cell after transmitting a first scheduled transmission message in a process of performing random access on a secondary serving cell
  • the checking module is configured to check whether the message includes the cell-radio network temporary identifier C-RNTI of the serving cell, and the determining module is configured to determine whether the message is a conflict resolution message when the checking result of the checking module is that the C-RNTI is included;
  • the determining module is configured to determine that the conflict resolution is determined when the judgment result of the module is a conflict resolution message, and the secondary serving cell access is successful.
  • the foregoing determining module includes: a first determining unit, configured to determine whether the message carries a downlink allocation indication; and the first determining unit is configured to: when the determining result of the first determining unit is that the message carries a downlink allocation indication, determining that the message is not a conflict resolution message.
  • the second determining unit is configured to determine that the first judging unit is that the message does not carry the downlink allocation indication, and the determining message is a conflict resolution message.
  • the foregoing determining module includes: a third determining unit, configured to: when the message carries an uplink grant indication, determine that the message is a conflict resolution message.
  • the foregoing determining module includes: a fourth determining unit, configured to: when the message carries an uplink grant indication and a padding indication, determine that the message is a conflict resolution message.
  • a fourth determining unit configured to: when the message carries an uplink grant indication and a padding indication, determine that the message is a conflict resolution message.
  • FIG. 1 is a flowchart of a method for random access of a secondary serving cell according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of a collision-based random access procedure according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of a method for random access of a secondary serving cell according to Embodiment 2 of the present invention
  • FIG. 1 is a flowchart of a method for random access of a secondary serving cell according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of a collision-based random access procedure according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of a method for random access of a secondary serving cell according to Embodiment 2 of the present invention
  • FIG. 1 is a flowchart of a method for random access of a secondary serving cell according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of a collision-based random access procedure according to Embod
  • FIG. 5 is a schematic diagram of a method for random access of a secondary serving cell according to Example 3 of the present invention
  • FIG. 6 is a schematic diagram of a method for random access of a secondary serving cell according to Example 4 of the present invention
  • FIG. 7 is a secondary serving cell according to Example 5 of the present invention
  • FIG. 8 is a structural block diagram of a user equipment according to Embodiment 2 of the present invention.
  • Embodiment 1 provides a method for random access of a secondary serving cell.
  • the method includes the following steps: Step S102: A user equipment (UE) performs random access on a secondary serving cell, After the first scheduled transmission message is sent, the message of the secondary serving cell is received.
  • the triggering mode of the process of the user equipment performing the random access on the secondary serving cell may include the following: The user equipment receives the secondary serving cell of the base station.
  • the access device determines that the primary serving cell and the secondary serving cell use different TAs according to the pre-configured information of the base station, and determines to perform uplink synchronization on the secondary serving cell. In both cases, the user equipment performs random access to the activated secondary serving cell.
  • Step S104 The user equipment checks whether the message includes the C-RNTI of the serving cell. The C-RNTI of each serving cell is the same. That is, the secondary serving cell and the primary serving cell have the same C-RNTI; Step S106, if the C-RNTI is included, the user equipment determines whether the message is a conflict resolution message; Step S108, if it is a conflict resolution message, the user equipment determines The conflict is resolved, and it is determined that the secondary service cell access process is successfully completed.
  • the present embodiment After receiving the C-RNTI of the serving cell, the present embodiment does not immediately consider that the conflict has been resolved, but further confirms whether the message is a conflict resolution message, and considers that the message is a conflict resolution message. Collision resolution, the access process of the secondary serving cell is successfully completed, and the conflict problem in the random access process of the Scell is solved, so that the UE can perform normal data transmission and reception, thereby avoiding the misjudgment of the conflict resolution in the random access process, and reducing the number of errors. Interference to other UEs.
  • the random access procedure performed by the UE on the secondary serving cell is as shown in FIG. 2.
  • the random access procedure is a contention based random access procedure, and includes the following four steps: Step 1: User The device (also referred to as a terminal, denoted by the UE) transmits a random access preamble (RAP) message on the uplink through a random access channel (RACH, Random Access CHannel); Step 2: media connection of the base station (e B) A random access response message (MAC, Medium Access Control) is sent to the terminal on a downlink shared channel (DL-SCH, Downlink-Shared Channel); the message includes at least a random access preamble identifier (RAPID, Random Access Preamble) IDentifier) Time adjustment information (TA, Time Alignment), initial uplink grant (UL Grant, Uplink Grant), and temporary cell-temporary network temporary identifier (Temporary C-RNTI); the message passes random access on the physical downlink control channel - Random Access-Radio Network Temporary Identifier (RA-RNTI) for indication; Step 3: Terminal is on the uplink The first scheduled transmission (UL-SCH,
  • the conflict resolution condition is: The PDCCH transmission is a C-RNTI indication, and carries A new UL grant for transmission. b) If it is a collision random access procedure triggered by PDCCH order, the condition of the collision resolution is: The PDCCH transmission is a C-RNTI indication.
  • the conflict resolution condition is:
  • the received conflict resolution identifier is consistent with the conflict resolution identifier in msg3.
  • 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 Scell execution.
  • the random access procedure but does not exclude other events that trigger the Scell to perform the random access procedure.
  • a random access procedure performed when the Scell is activated is also included.
  • the user equipment determines whether the message is a conflict resolution message.
  • the user equipment determines whether the message carries a downlink allocation indication (DL assignment). If the downlink allocation indication is carried, the user equipment determines that the message is not a conflict. Resolving the message; if the downlink allocation indication is not carried, the user equipment determines that the message is a conflict resolution message.
  • DL assignment downlink allocation indication
  • the user equipment determines that the message is a conflict resolution message.
  • the message carries an uplink grant indication (UL grant)
  • the user equipment determines that the message is a conflict resolution message.
  • the message carries an uplink grant indication and a padding indication
  • the user equipment determines that the message is a conflict resolution message. If the message is not a conflict resolution message, after receiving the message, the user equipment continues to wait to receive the next message (ie, continues to wait for the status of the received collision resolution message).
  • the UE when the conflicting random access procedure is performed after the Scell is activated, the UE detects the SPDCCH related to the Scell that is performing the random access procedure, receives the C-RNTI indication, and may further include information other than the DL allocation, and then considers that Conflict resolution; for example: The information can be empty, or a new transmitted UL grant, or a new grant's UL grant and padding.
  • the following application environments are taken as an example to provide examples 1 to 5.
  • the base station 1 is a base station having carrier aggregation capability.
  • the base station 1 governs two cells, which are Cell 1 (Celll) and Cell 2 (Cell 2).
  • the two cells may provide carrier aggregation capabilities to the user equipment to extend the bandwidth of the transmission.
  • 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 two simultaneously working cells (Celll, Cell2) according to the capability of the UE1, where the Celll provides the NAS layer for the UE1.
  • the mobility information such as the PLMN, the global cell identifier CGI, and the location area identifier TAC, is the primary cell (Pcell) of the UE1, or the primary serving cell, and the UE1 only receives the system of the primary cell. Information and paging messages.
  • Celll and Cell2 may be RRH cells, or pass through a repeater, or be a normal cell.
  • Example 1 In this example, Cell2 is a self-scheduling method, as shown in Figure 3, a method for random access of a secondary serving cell. The method includes the following steps: Step 1: The base station sends a MAC CE to the UE, including a command to activate Cell2. After the UE receives the command, the Cell2 is activated. Step 2: The base station notifies the UE, or the UE learns that the Cell 2 and the Celll need to use different TAs according to the pre-configuration information of the base station, and needs to perform uplink synchronization on the Cell2. Step 3: The UE performs on the Cell2.
  • a common preamble is selected, including the RA-RNTI, and is sent to the base station through the PRACH of the Cell2.
  • Step 4 The base station receives the common preamble, calculates the TA, allocates a Temporary C-RNTI, and generates a random connection.
  • the response message is sent to the terminal in the DL-SCH of the Cell 2, where the message includes the TA, the initial uplink grant, and the Temporary C-RNTI; the message is indicated by the RA-RNTI on the PDCCH on the Cell 2;
  • Step 5 The terminal is The first scheduled transmission message is sent on the UL-SCH on Cell2, and the message contains
  • Step 6 The base station sends a DL assignment indication on the DL-SCH of the Celll, indicated by the C-RNTI; Step 7: The UE receives the DL assignment, receives according to normal data, and is still waiting for msg4; Step 8: The base station sends a conflict resolution message on the DL-SCH of Cell2; the message passes through the PDCCH.
  • the C-RNTI performs the indication and includes an uplink grant indication (UL grant).
  • Step 9 After receiving the msg4, the UE checks that the C-RNTI indication of the PDCCH on the Cell2, and also includes the UL grant, and considers that the conflict is resolved. The random access procedure on the above is successfully completed, and the uplink synchronization is obtained.
  • Example 2 In this example, Cell2 is a self-scheduling method, as shown in Figure 4, a method for random access of a secondary serving cell, and the method includes the following steps: Step 1: The base station sends a MAC CE to the UE, including the command to activate the Cell2, and the UE activates the Cell2 after receiving the command.
  • Step 2 The base station notifies the UE, or the UE learns that the Cell 2 and the Celll need to adopt different TAs according to the pre-configuration information of the base station.
  • the uplink synchronization needs to be performed on the Cell 2;
  • Step 3 The UE performs a random access procedure on the Cell 2, and selects a common preamble, including the RA-RNTI, and sends the PRACH to the base station through the PRACH of the Cell 2;
  • Step 4 The base station receives the common preamble
  • the TA is allocated, and the Temporary C-RNTI is allocated, and the random access response message is sent to the terminal in the DL-SCH of the Cell2, where the message includes the TA, the initial uplink grant, and the Temporary C-RNTI; the message passes through the PDCCH on the Cell2.
  • the RA-RNTI indicates;
  • Step 5 The terminal sends the first scheduled transmission message on the UL-SCH on Cell2; the message includes
  • Step 6 At this time, the base station sends a DL assignment indication on the DL-SCH of Cell2, indicated by the C-RNTI; Step 7: The UE receives the DL assignment, according to normal data reception, while still Waiting for msg4; Step 8: The base station sends a collision resolution message on the DL-SCH of Cell2; the message passes through the PDCCH.
  • the C-RNTI performs the indication and does not include other information.
  • Step 9 After receiving the msg4, the UE checks that the C-RNTI indication of the PDCCH on the Cell2 is not included, and does not include the DL assignment, and considers that the conflict is resolved, and considers the random access procedure on the Cell2. Successful completion, get uplink synchronization.
  • Example 3 In this example, Cell2 is scheduled by the Pcell, as shown in Figure 5, which is a method for random access of the secondary serving cell. The method includes the following steps: Step 1: The base station sends a MAC CE to the UE, including the command to activate Cell2.
  • Step 2 The base station notifies the UE, or the UE learns that the Cell 2 and the Celll need to use different TAs according to the pre-configuration information of the base station, and needs to perform uplink synchronization on the Cell 2;
  • Step 3 The UE performs a random access procedure on Cell2, and selects a common preamble, including the RA-RNTI, and sends the RAACH to the base station through the PRACH of the Cell2.
  • Step 4 The base station receives the common preamble, calculates the TA, and allocates the Temporary C- The RNTI, the generated random access response message is sent to the terminal in the DL-SCH of the Cell2, where the message includes the TA, the initial uplink grant, and the Temporary C-RNTI; the message is indicated by the RA-RNTI on the PDCCH corresponding to the Cell2 on the Pcell;
  • Step 5 The terminal sends the first scheduled transmission message on the UL-SCH on Cell2; the message includes the C-RNTI;
  • Step 6 At this time, the base station sends a DL assignment indication on the DL-SCH of Cell2, The C-RNTI indication on the PDCCH corresponding to the Cell2 on the Pcell;
  • Step 8 The base station sends a conflict resolution message on the DL-SCH of the Cell2; The message is indicated by the
  • the Cell2 in this example is a self-scheduling method, as shown in FIG. 6, a method for randomly accessing a secondary serving cell, and the method includes the following steps: Step 1: The UE has uplink data arriving, and the data volume is relatively large. The UE is in an out-of-synchronization state and has been deactivated.
  • the UE learns that the Cell 2 and the Cellll need to use different TAs according to the pre-configuration information of the base station, and needs to perform a random access procedure on the Cell 2;
  • Step 2 The UE performs a random access procedure on the Cell 2, Select a common preamble, including the RA-RNTI, and send it to the base station through the PRACH of Cell2.
  • Step 3 The base station receives the common preamble, calculates the TA, allocates the Temporary C-RNTI, and generates a random access response message in the DL- of Cell2.
  • the SCH is sent to the terminal, where the message includes the TA, the initial uplink grant, and the Temporary C-RNTI; the message is indicated by the RA-RNTI on the PDCCH on the Cell2; Step 4: The terminal sends the first scheduled transmission on the UL-SCH on Cell2; the message includes the C-RNTI, waiting for msg4 ; Step 5: The base station sends a conflict resolution message on the DL-SCH of Cell2; the message passes through Cell2. The C-RNTI on the PDCCH is instructed to include the UL grant. Step 6: After receiving the msg4, the UE checks that it is the C-RNTI indication on the Cell2, and further includes the UL grant, and considers that the conflict is resolved.
  • Step 7 The UE performs uplink data transmission.
  • Implementation 5 The Cell2 in this example is scheduled by the Pcell, as shown in Figure 7, the method for the random access of the secondary serving cell, the method includes the following steps: Step 1: The UE has downlink data arriving, and the data volume is relatively large, at this time, Cell2 In the out-of-synchronization state, and has been deactivated, the base station informs the UE that Cell2 and Celll need to adopt different TAs, and needs to perform a random access procedure on Cell2.
  • Step 2 Due to lack of dedicated preamble resources, the base station The UE does not allocate a dedicated preamble to the UE.
  • the UE performs a random access procedure on Cell2, and selects a common preamble, including the RA-RNTI, and sends it to the base station through the PRACH of Cell2.
  • Step 3 The base station receives the common preamble and calculates the TA.
  • the Temporary C-RNTI is allocated, and a random access response message is sent to the terminal in the DL-SCH of the Cell2, where the message includes the TA, the initial uplink grant, and the Temporary C-RNTI; the message passes the RA- on the Cell2-related PDCCH on the Pcell.
  • step 4 the first terminal transmits a scheduled transmission on UL-SCH on Cell2; the message contains the C-RNTI, wait Msg4; step 5: the base station The collision resolution message is sent on the DL-SCH of the Cell 2; the message is indicated by the C-RNTI on the PDCCH corresponding to the Cell 2 on the Pcell, and the UL grant is also included.
  • Step 6 After receiving the msg4, the UE checks the C-RNTI of the Cell 2 The indication further includes a UL grant, and the conflict is resolved. The random access procedure on Cell2 is successfully completed, and uplink synchronization is obtained.
  • Step 7 The base station sends a downlink assignment (DL assignment) on the DL-SCH of Cell2, and is related to Cell2 on the Pcell. C-RNTI indication on the PDCCH; Step 8: The UE receives the DL assignment and receives it according to normal data.
  • DL assignment downlink assignment
  • Step 8 The UE receives the DL assignment and receives it according to normal data.
  • the foregoing examples respectively describe how the UE determines the conflict resolution in different situations. It can be seen that the UE can accurately distinguish whether the received message is a conflict resolution message, and then complete the access process of the secondary serving cell. Uplink synchronization avoids collisions between UEs.
  • Embodiment 2 This embodiment provides a user equipment. Referring to FIG.
  • the user equipment includes the following modules: A message receiving module 82 is configured to perform a random access process on a secondary serving cell, when the first one is scheduled to be sent. After transmitting the message, the message of the secondary serving cell is received.
  • the triggering manner of the process for the user equipment to perform the random access on the secondary serving cell may include the following: the user equipment receives the secondary serving cell access notification of the base station; the user equipment determines the primary serving cell according to the pre-configured information of the base station.
  • the secondary serving cell uses different TAs to determine to perform uplink synchronization on the secondary serving cell. In both cases, the user equipment will randomly access the activated secondary serving cell.
  • the checking module 84 is connected to the message receiving module 82 and configured to check whether the message includes the C-RNTI of the serving cell.
  • the judging module 86 is connected to the checking module 84, and is set to check the result of the checking module 84 to include the above
  • the determining module 88 is connected to the determining module 86.
  • the determining conflict resolution is determined, and determining that the secondary serving cell access process is successfully completed.
  • the present embodiment After receiving the C-RNTI of the PDCCH that includes the secondary serving cell, the present embodiment does not immediately consider that the conflict has been resolved, but further confirms whether the message is a conflict resolution message, and considers the acknowledgement when it is a conflict resolution message.
  • the determining module 86 determines whether the message is a conflict resolution message, and may include the following manners: 1) the determining module 86 includes: a first determining unit, configured to determine whether the message carries a downlink allocation indication; and the first determining unit is configured to be the first The determining result of the determining unit is that the message carries the downlink allocation indication, and the determining message is not the conflict resolution message.
  • the second determining unit is configured to determine that the message does not carry the downlink allocation indication, and the determining message is the conflict resolution message.
  • the judging module 86 includes: a third determining unit, configured to: when the message carries an uplink grant indication, determine that the message is a conflict resolution message.
  • the determining module 86 includes: a fourth determining unit, configured to: when the message carries an uplink grant indication and a fill indication, determine that the message is a conflict resolution message. If the message is not a conflict resolution message, after receiving the message, the user equipment continues to wait to receive the next message (ie, continues to wait for the status of the received collision resolution message).
  • the UE detects the SPDCCH related PDCCH that is performing the random access procedure, receives the C-RNTI indication, and may also include information other than the DL allocation. Think that the conflict is resolved.
  • the information can be empty, or a new UL grant of transmission, or a UL grant and padding containing the new transport.
  • Industrial Applicability The technical solution of the present invention is directed to multiple cell access situations.
  • the user equipment needs to wait for a conflict resolution message, and firstly judges the received message in the waiting process.
  • the serving cell when the secondary serving cell is used, it is further confirmed whether the message is a conflict resolution message.
  • the message is a conflict resolution message, the conflict is considered to be resolved, and the secondary cell access process is successfully completed, and the Scell is solved.
  • the conflict problem in the random access process enables the UE to perform normal data transmission and reception, avoids the misjudgment of the conflict resolution of the random access process, reduces the interference to other UEs, and improves the performance of the entire system.
  • the user equipment needs to wait for a conflict resolution message in the random access process of the secondary serving cell, and firstly receives the received message in the waiting process. It is determined that the serving cell is for the serving cell. When the secondary serving cell is used, it is further confirmed whether the message is a conflict resolution message. When the message is a conflict resolution message, the conflict is considered to be resolved, and the secondary service cell access process is successfully completed.

Abstract

本发明公开了一种辅服务小区随机接入的方法和用户设备。其中,该方法包括:用户设备在辅服务小区上执行随机接入的过程中,当发送首个被调度传输消息后,接收辅服务小区的消息;用户设备检查消息是否包含服务小区的C-RNTI;如果包含该C-RNTI,用户设备判断消息是否为冲突解决消息;如果是冲突解决消息,用户设备确定冲突解决,并确定该辅服务小区接入过程成功完成。通过本发明,解决了辅服务小区的随机接入过程中的冲突问题,减少了对其他UE的干扰。

Description

辅服务小区随机接入的方法和用户设备 技术领域 本发明涉及通信领域, 具体而言, 涉及一种辅服务小区随机接入的方法和用户设 备。 背景技术 在无线蜂窝通信系统中, 随机接入过程 (Random Access Procedure) 用于空闲状 态 (RRC_IDLE) 的终端 (或称为用户设备 UE, User Equipment) 初始访问网络, 或 连接状态(RRC_CO NECTED)的终端与网络进行上行同步(Uplink synchronization) 及获取资源分配, 以进行后续数据通信。 在第三代伙伴组织计划 (3GPP, Third Generation Partnership Project) 长期演进
(LTE, Long Term Evolution)系统的演进的通用陆地无线接入网(E-UTRAN, Evolved Universal Terrestrial Radio Access Network, 也称为增强型基站 e B) 中, 以下六种事 件可以触发终端的随机接入过程: (1 ) 空闲状态初始接入; (2) 无线资源控制连接重 建过程(RRC Connection Re-establishment procedure); (3 )切换(HO, Handover); (4) RRC连接状态下行数据到达需要随机接入过程, 例如当上行同步状态为"非同步 "时; ( 5 ) RRC连接状态上行数据到达需要随机接入过程,例如当上行同步状态为"非同步" 或者没有可用的物理上行控制信道 (PUCCH, Physical Uplink Control Channel) 资源 发送调度请求 (SR, Schedule Request); (6) RRC连接状态为定位目的需要随机接入 过程, 例如 UE定位需要定时提前 (TA, Timing Advance )。 随机接入过程有两种不同 的形式: 基于冲突的 (Contention Based) (适用于上述前五种事件); 非基于冲突的 (Non-Contention Based) (适用于上述 (3 )、 (4)、 (6) 事件)。 在随机接入过程成功 后, 可以进行正常的下行或上行传输。 随机接入过程可以由物理下行控制信道信令 (PDCCH order, Physical Downlink Control Channel order) 或者 UE的媒体接入控制层 (MAC, Medium Access Control) 发起, 可选地, PDCCH order或者无线资源控制 (RRC, Radio Resource Control) 信 令可以为 UE分配专用随机接入前导 (Random Access Preamble), 则随机接入过程为 非基于冲突的方式; 否则, UE需要选择随机接入前导, 则随机接入过程为基于冲突的 方式。 UE选择随机接入资源包括选择随机接入前导和物理随机接入信道 (PRACH, Physical Random Access Channel) 的时频域资源等。 为向移动用户提供更高的数据速率, 高级长期演进系统 (Long Term Evolution Advance, 简称 LTE-A)提出了载波聚合技术 (Carrier Aggregation, 简称 CA), 其目 的是为具有相应能力的 UE提供更大宽带, 提高 UE的峰值速率。 LTE中, 系统支持 的最大下行传输带宽为 20MHz, 载波聚合是将两个或者更多的分量载波 (Component Carriers, 简称 CC) 聚合起来支持大于 20MHz, 最大不超过 100MHz的传输带宽, 初 期阶段 UL CC的总数配置小于等于 DL CC的总数配置。 具有载波聚合能力的 LTE-A UE, 可以同时在多个分量载波上收发数据, 以下涉及的 UE 除了特别说明都是此类 UE。 LTE-A系统中, UE进入连接态后可以同时通过多个分量载波 (如 CC1, CC2) 与源基站进行通信, 源基站会通过显式的配置或者按照协议约定为 UE指定一个主分 量载波(Primary Component Carrier, PCC),其他的分量载波称为辅分量载波( Secondary Component Carrier, SCO,在 PCC上的服务小区称为主服务小区(Primary Cell, Pcell), 在 SCC上的服务小区称为辅服务小区 (Secondary Cell, Scell )0 辅服务小区是在 UE 进入连接态后由基站配置的。 一般情况下, 某个服务小区都是有对称的上行和下行 ( Scell可以只配置下行), 在 SIB2中明确指出, 为了避免控制信道的干扰, 引入了跨 载波调度的概念,即当某个 Scell的 PDCCH干扰比较严重的情况下,该 Scell的 PDCCH 就不启用, 而是通过另外一个服务小区来调度该 Scell的 PDSCH, 这里的另外一个服 务小区可以通过 RRC信令配置。 基站只为一个 UE分配一个 C-RNTI, 即每个服务小 区的 C-RNTI是相同的。 从 UE省电和 CC管理的角度出发, 基站 (eNB) 可以通过显示命令 (MAC CE) 激活 /去激活某 SCell, PCell不能够被激活 /去激活。 UE只在激活的载波上进行数据接 收, 如物理下行控制信道 (Physical Downlink Control Channel, PDCCH) 的监听, 发 送 SRS ( Sounding Reference Symbols) 禾口上报 CQI (Channel Quality Indicator) /PMI (Precoding Matrix Index) /RI (Rank Indicator); 而对于暂时不用的载波, 基站通过显 示命令通知或隐式规则去激活这些载波,在去激活的载波上, UE不监听 PDCCH信道, 也不接收物理下行共享信道 (Physical Downlink Shared Channel, PDSCH) 上的数据, 不发送 SRS, 不上报 CQI/PMI/RL 不发送上行数据, 从而达到省电的目的。 载波聚合初期阶段 (即 RellO), Scell的个数比较少 (例如只有 1个), 而且场景 也有限制,例如不支持上行射频拉远(Remote Radio Head, RRH)和中继器(repeater), 因此只存在一个 TA, UE只需要在 Pcell发起上行同步即可, Scell上不会发起。 而由于数据量的提升, Scell的个数会增多 (例如增加到 4个), 场景也会放宽, 例如支持上行 RRH和 repeater, —个 TA不能解决问题, 因此会引入多个时间调整信 息 (TA, Time Alignment ) o 这时候, Scell上也会发起上行同步, 并且在 Scell激活后 才执行随机接入过程。 如果 Scell上执行的是基于冲突的随机接入过程, UE在等待冲 突解决消息 (msg4) 的时候, 有可能会调度该 Scell的 DL数据 (用 C-RNTI指示), 那么就会存在这个问题: UE收到 DL数据调度, 可能会被误认为收到了冲突解决消息 (msg4), 则 UE就认为冲突成功解决了, 其实这时候冲突并没有解决, 引起 UE和基 站对冲突解决的不一致性, 即基站认为该 Scell上的上行同步并没有成功但是 UE认为 成功了, UE开始在该 Scell上发送上行 SRS, 上报 CQI/PMI/RL 将给其他 UE造成很 大的干扰, 引起 UE间的冲突。 针对相关技术中上述 Scell的随机接入过程中的冲突问题,目前尚未提出有效的解 决方案。 发明内容 本发明提供了一种辅服务小区随机接入的方法和用户设备, 以至少解决上述 Scell 的随机接入过程中的冲突问题。 根据本发明的一个方面, 提供了一种辅服务小区随机接入的方法, 包括: 用户设 备在辅服务小区上执行随机接入的过程中, 当发送首个被调度传输消息后, 接收辅服 务小区的消息;用户设备检查消息是否包含服务小区的 C-RNTI;如果包含该 C-RNTI, 用户设备判断消息是否为冲突解决消息; 如果是冲突解决消息, 用户设备确定冲突解 决, 并确定该辅服务小区接入过程成功完成。 上述用户设备判断消息是否为冲突解决消息包括: 用户设备判断消息是否携带有 下行分配指示; 如果携带有下行分配指示, 用户设备确定消息不是冲突解决消息; 如 果没有携带有下行分配指示, 用户设备确定消息为冲突解决消息。 上述用户设备判断消息是否为冲突解决消息包括:当消息携带有上行授权指示时, 用户设备确定消息是冲突解决消息。 上述用户设备判断消息是否为冲突解决消息包括: 当消息携带有上行授权指示和 填充指示时, 用户设备确定消息是冲突解决消息。 上述用户设备在辅服务小区上执行随机接入的过程的触发方式包括以下之一: 用 户设备接收到基站的辅服务小区接入通知; 用户设备根据基站预配置的信息确定主服 务小区与辅服务小区采用不同的 TA, 确定在辅服务小区上执行上行同步。 上述方法还包括: 如果消息不是冲突解决消息, 用户设备接收消息后, 继续等待 接收下一个消息。 根据本发明的另一方面, 提供了一种用户设备, 包括: 消息接收模块, 设置为在 辅服务小区上执行随机接入的过程中, 当发送首个被调度传输消息后, 接收辅服务小 区的消息; 检查模块, 设置为检查消息是否包含服务小区的小区 -无线网络临时标识 C-RNTI; 判断模块, 设置为检查模块的检查结果为包含 C-RNTI时, 判断消息是否为 冲突解决消息; 确定模块, 设置为判断模块的判断结果是冲突解决消息时, 确定冲突 解决, 该辅服务小区接入成功。 上述判断模块包括: 第一判断单元, 设置为判断消息是否携带有下行分配指示; 第一确定单元, 设置为第一判断单元的判断结果为消息携带有下行分配指示时, 确定 消息不是冲突解决消息; 第二确定单元, 设置为第一判断单元的判断结果为消息没有 携带有下行分配指示, 确定消息为冲突解决消息。 上述判断模块包括: 第三确定单元, 设置为当消息携带有上行授权指示时, 确定 消息是冲突解决消息。 上述判断模块包括: 第四确定单元, 设置为当消息携带有上行授权指示和填充指 示时, 确定消息是冲突解决消息。 通过本发明, 在收到含有该服务小区的 C-RNTI后, 不会立即认为冲突已解决, 而是进一步确认该消息是否为冲突解决消息, 在是冲突解决消息时, 才会认为冲突解 决,认为该辅服务小区接入过程成功完成,解决了 Scell的随机接入过程中的冲突问题, 使得 UE间能正常进行数据收发, 避免了随机接入过程的冲突解决的误判, 减少了对 其他 UE的干扰。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部分, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是根据本发明实施例 1的辅服务小区随机接入的方法流程图; 图 2是根据本发明实施例 1的基于冲突的随机接入过程的示意图; 图 3是根据本发明实例一的辅服务小区随机接入的方法示意图; 图 4是根据本发明实例二的辅服务小区随机接入的方法示意图; 图 5是根据本发明实例三的辅服务小区随机接入的方法示意图; 图 6是根据本发明实例四的辅服务小区随机接入的方法示意图; 图 7是根据本发明实例五的辅服务小区随机接入的方法示意图; 图 8是根据本发明实施例 2的用户设备的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在不冲突的 情况下, 本申请中的实施例及实施例中的特征可以相互组合。 为了解决相关技术中 Scell上冲突解决混淆的问题,本发明实施例提供了一种辅服 务小区随机接入的方法和用户设备。 实施例 1 本实施例提供了一种辅服务小区随机接入的方法, 参见图 1, 该方法包括以下步 骤: 步骤 S102, 用户设备 (UE) 在辅服务小区上执行随机接入的过程中, 当发送首 个被调度传输消息后, 接收辅服务小区的消息; 其中, 用户设备在辅服务小区上执行随机接入的过程的触发方式可以包括以下之 一: 用户设备接收到基站的辅服务小区接入通知; 用户设备根据基站预配置的信息确 定主服务小区与辅服务小区采用不同的 TA,确定在辅服务小区上执行上行同步。在这 两种情况下, 用户设备均会对激活的辅服务小区进行随机接入; 步骤 S104, 用户设备检查消息是否包含服务小区的 C-RNTI; 其中, 每个服务小 区的 C-RNTI相同, 即辅服务小区与主服务小区具有相同的 C-RNTI; 步骤 S106, 如果包含上述 C-RNTI, 该用户设备判断上述消息是否为冲突解决消 息; 步骤 S108, 如果是冲突解决消息, 该用户设备确定冲突解决, 并确定该辅服务小 区接入过程成功完成。 本实施例在收到含有该服务小区的 C-RNTI后, 不会立即认为冲突已解决, 而是 进一步确认该消息是否为冲突解决消息, 在确认该消息是冲突解决消息时, 才会认为 冲突解决, 认为该辅服务小区接入过程成功完成,解决了 Scell的随机接入过程中的冲 突问题, 使得 UE能正常进行数据收发, 避免了随机接入过程的冲突解决的误判, 减 少了对其他 UE的干扰。 其中, 上述 UE在辅服务小区上执行的随机接入过程如图 2所示, 该随机接入过 程是基于冲突 (Contention based) 的随机接入过程, 包括下述四个步骤: 步骤 1 : 用户设备(也称为终端, 用 UE表示)在上行通过随机接入信道(RACH, Random Access CHannel) 发送随机接入前导 (RAP, Random Access Preamble) 消息; 步骤 2: 基站(e B) 的媒体接入控制层 (MAC, Medium Access Control)生成随 机接入响应消息在下行共享信道 (DL-SCH, Downlink-Shared Channel) 发送给终端; 该消息中至少包含随机接入前导标识 (RAPID, Random Access Preamble IDentifier) 时间调整信息 (TA, Time Alignment )、 初始上行授权(UL Grant, Uplink Grant)和临 时小区 -无线网络临时标识 (Temporary C-RNTI); 该消息通过在物理下行控制信道上 的随机接入 -无线网络临时标识 (RA-RNTI, Random Access-Radio Network Temporary Identifier) 进行指示; 步骤 3 : 终端在上行共享传输信道 (UL-SCH, Uplink-Shared Channel) 上发送首 个被调度传输 (Scheduled Transmission) 消息; 该消息的内容至少包含小区-无线网络 临时标识 (C-RNTI)、 媒体接入控制元 (MAC Control Element) 或者包括冲突解决标 识(CRID, Contention Resolution Identity) 的公共控制逻辑信道业务数据单元(CCCH SDU);该消息的发送支持混合自动重传请求(HARQ, Hybrid Automatic Retransmission reQuest); 步骤 4: 基站在 DL-SCH上发送冲突解决消息(Contention Resolution); 该消息通 过 PDCCH上的 C-RNTI或临时 C-RNTI进行指示,可以包括冲突解决标识, 该消息的 发送支持 HARQ。 上述步骤 3和 4是用来解决冲突的。 UE发送 msg3 (被调度传输消息) 后, 等待 接收 msg4 (冲突解决消息), 并根据以下条件判断冲突是否解决:
1 ) 如果 msg3中包含了 C-RNTI, 有以下两种情况: a) 如果是 UE 自己发起的冲突的随机接入过程, 则冲突解决的条件是: PDCCH 传输是 C-RNTI指示, 并且携带了一个新的传输的 UL授权。 b) 如果是 PDCCH order触发的冲突的随机接入过程, 则冲突解决的条件是: PDCCH传输是 C-RNTI指示。
2)如果 msg3包含 CCCH SDU,是用 temp-C-RNTI指示的,则冲突解决的条件是: 收到的冲突解决标识跟 msg3中的冲突解决标识一致。 上述触发终端的随机接入过程的六个事件中, 其中 (4) RRC 连接状态下行数据 到达需要随机接入过程, 和 (5 ) RRC 连接状态上行数据到达需要随机接入过程, 会 触发 Scell执行随机接入过程, 但是不排除其他事件触发 Scell执行随机接入过程。 另 夕卜, 还包括 Scell激活时执行的随机接入过程。 其中, 用户设备判断该消息是否为冲突解决消息可以包括以下方式: 1 ) 用户设备判断该消息是否携带有下行分配指示 (DL assignment); 如果携带有 下行分配指示, 该用户设备确定该消息不是冲突解决消息; 如果没有携带有下行分配 指示, 该用户设备确定该消息为冲突解决消息。
2) 当该消息携带有上行授权指示 (UL grant) 时, 用户设备确定该消息是冲突解 决消息。 3 )当该消息携带有上行授权指示和填充指示时,用户设备确定该消息是冲突解决 消息。 如果该消息不是冲突解决消息, 用户设备接收该消息后, 继续等待接收下一个消 息 (即继续等待接收冲突解决消息状态)。 本实施例在 Scell激活后执行冲突的随机接入过程时, UE检测到正在执行随机接 入过程的 Scell相关的 PDCCH, 收到 C-RNTI指示, 还可以包含除 DL分配以外的信 息, 则认为冲突解决; 例如: 该信息可以为空, 或者是一个新的传输的 UL授权, 或 者包含新的传输的 UL授权和填充指示 (padding)。 下面以下述应用环境为例, 提供了实例一至五进行说明。 在 LTE-A系统中, 基站 1是具有载波聚合能力的基站。 基站 1管辖了 2个小区, 分别是小区 1 (Celll )、 小区 2 (Cell2)。 这 2个小区中的部分或全部可以向用户设备提供载波聚合的能力以扩展传 输的带宽。 用户设备 UE1通过基站 1接入了网络(或者网络将 UE切换到基站 1 ), 基 站 1根据 UE1的能力为其配置了 2个同时工作的小区 (Celll、 Cell2), 其中 Celll为 UE1提供 NAS层移动性信息如 PLMN、全局小区标识 CGI、位置区标识 TAC等信息, 是 UE1的主小区 (Primary Cell, Pcell)、 或主服务小区, UE1只接收主小区的系统消 息和寻呼消息。 Celll、 Cell2可以是 RRH小区, 或者经过中继器 (repeater), 或者是 普通的小区。 实例一: 本实例中, Cell2是自己调度自己,如图 3所示辅服务小区随机接入的方法示意图, 该方法包括以下步骤: 步骤 1: 基站发送 MAC CE给 UE, 包含将 Cell2激活的命令, UE收到命令后将 Cell2激活; 步骤 2: 基站通知 UE, 或者 UE根据基站预配置信息获知 Cell2与 Celll需要采用 不同的 TA, 需要在 Cell2上执行上行同步; 步骤 3 : UE在 Cell2上执行随机接入过程,自行选择一个公共前导,包含 RA-RNTI, 通过 Cell2的 PRACH, 发送给基站; 步骤 4: 基站收到该公共前导, 计算 TA, 分配 Temporary (临时) C-RNTI, 生成 随机接入响应消息, 并在 Cell2的 DL-SCH发送给终端, 该消息中包含 TA、 初始上行 授权和 Temporary C-RNTI; 该消息通过 Cell2上的 PDCCH上的 RA-RNTI进行指示; 步骤 5: 终端在 Cell2 上的 UL-SCH 上发送首个被调度传输消息, 该消息包含
C-RNTI; 步骤 6:基站在 Celll的 DL-SCH发送下行分配(DL assignment)指示,通过 C-RNTI 指示; 步骤 7: UE收到 DL assignment, 按照正常的数据接收, 同时仍在等待 msg4; 步骤 8: 基站在 Cell2的 DL-SCH上发送冲突解决消息; 该消息通过 PDCCH上的
C-RNTI进行指示, 同时包含一个上行授权指示 (UL grant); 步骤 9: UE收到 msg4后, 检查到是 Cell2上 PDCCH的 C-RNTI指示, 还包含了 UL grant, 认为冲突解决, 认为 Cell2上的随机接入过程成功完成, 获得上行同步。 实例二: 本实例中 Cell2是自己调度自己, 如图 4所示辅服务小区随机接入的方法示意图, 该方法包括以下步骤: 步骤 1: 基站发送 MAC CE给 UE, 包含将 Cell2激活的命令, UE收到命令后将 Cell2激活; 步骤 2: 基站通知 UE, 或者 UE根据基站预配置信息获知 Cell2与 Celll需要采用 不同的 TA, 需要在 Cell2上执行上行同步; 步骤 3 : UE在 Cell2上执行随机接入过程,自行选择一个公共前导,包含 RA-RNTI, 通过 Cell2的 PRACH, 发送给基站; 步骤 4: 基站收到该公共前导, 计算 TA, 分配 Temporary C-RNTI, 生成随机接入 响应消息在 Cell2 的 DL-SCH 发送给终端, 该消息中包含 TA、 初始上行授权和 Temporary C-RNTI; 该消息通过 Cell2上的 PDCCH上的 RA-RNTI进行指示; 步骤 5: 终端在 Cell2 上的 UL-SCH 上发送首个被调度传输消息; 该消息包含
C-RNTI; 步骤 6: 此时, 基站在 Cell2的 DL-SCH发送下行分配(DL assignment)指示, 通 过 C-RNTI指示; 步骤 7: UE收到 DL assignment, 按照正常的数据接收, 同时仍在等待 msg4; 步骤 8: 基站在 Cell2的 DL-SCH上发送冲突解决消息; 该消息通过 PDCCH上的
C-RNTI进行指示, 没有包含其他信息; 步骤 9: UE收到 msg4后, 检查到是 Cell2上 PDCCH的 C-RNTI指示, 并且没有 包含 DL assignment, 认为冲突解决, 认为 Cell2上的随机接入过程成功完成, 获得上 行同步。 实例三: 本实例中 Cell2是被 Pcell调度的,如图 5所示辅服务小区随机接入的方法示意图, 该方法包括以下步骤: 步骤 1: 基站发送 MAC CE给 UE, 包含将 Cell2激活的命令, UE收到命令后将 Cell2激活; 步骤 2: 基站通知 UE, 或者 UE根据基站预配置信息获知 Cell2与 Celll需要采用 不同的 TA, 需要在 Cell2上执行上行同步; 步骤 3 : UE在 Cell2上执行随机接入过程,自行选择一个公共前导,包含 RA-RNTI, 通过 Cell2的 PRACH, 发送给基站; 步骤 4: 基站收到该公共前导, 计算 TA, 分配 Temporary C-RNTI, 生成随机接入 响应消息在 Cell2 的 DL-SCH 发送给终端, 该消息中包含 TA、 初始上行授权和 Temporary C-RNTI;该消息通过 Pcell上 Cell2相关的 PDCCH上的 RA-RNTI进行指示; 步骤 5: 终端在 Cell2 上的 UL-SCH 上发送首个被调度传输消息; 该消息包含 C-RNTI; 步骤 6: 此时, 基站在 Cell2的 DL-SCH发送下行分配(DL assignment)指示, 通 过 Pcell上 Cell2相关的 PDCCH上的 C-RNTI指示; 步骤 7: UE收到 DL assignment, 按照正常的数据接收, 同时仍在等待 msg4; 步骤 8: 基站在 Cell2的 DL-SCH上发送冲突解决消息; 该消息通过 Pcell上 Cell2 相关的 PDCCH上的 C-RNTI进行指示, 还包含 UL grant和填充指示 (padding); 步骤 9: UE收到 msg4后, 检查到是 Pcell上 Cell2相关的 PDCCH上的 C-RNTI 指示, 并且包含 UL grant, 认为冲突解决, 认为 Cell2上的随机接入过程成功完成, 获 得上行同步。 实例四: 本实例中的 Cell2是自己调度自己, 如图 6所示辅服务小区随机接入的方法示意 图, 该方法包括以下步骤: 步骤 1 : UE有上行数据到达, 数据量比较大, 此时 Cell2处于失步状态, 并且已 经去激活, UE根据基站预配置信息获知 Cell2与 Celll需要采用不同的 TA, 需要在 Cell2上执行随机接入过程; 步骤 2: UE在 Cell2上执行随机接入过程,自行选择一个公共前导,包含 RA-RNTI, 通过 Cell2的 PRACH, 发送给基站; 步骤 3 : 基站收到该公共前导, 计算 TA, 分配 Temporary C-RNTI, 生成随机接入 响应消息在 Cell2 的 DL-SCH 发送给终端, 该消息中包含 TA、 初始上行授权和 Temporary C-RNTI; 该消息通过 Cell2上的 PDCCH上的 RA-RNTI进行指示; 步骤 4:终端在 Cell2上的 UL-SCH上发送首个被调度传输;该消息包含 C-RNTI, 等待 msg4; 步骤 5:基站在 Cell2的 DL-SCH上发送冲突解决消息;该消息通过 Cell2上 PDCCH 上的 C-RNTI进行指示, 还包含 UL grant; 步骤 6: UE收到 msg4后, 检查到是 Cell2上的 C-RNTI指示, 还包含 UL grant, 认为冲突解决, 认为 Cell2上的随机接入过程成功完成, 获得上行同步; 步骤 7: UE进行上行数据发送。 实施五: 本实例中的 Cell2被 Pcell调度, 如图 7所示辅服务小区随机接入的方法示意图, 该方法包括以下步骤: 步骤 1 : UE有下行数据到达, 数据量比较大, 此时 Cell2处于失步状态, 并且已 经去激活, 基站通知 UE Cell2与 Celll需要采用不同的 TA, 需要在 Cell2上执行随机 接入过程, 此时 UE自行激活该 Cell2; 步骤 2: 由于专用前导资源缺乏, 基站没有分配专用前导给 UE, UE在 Cell2上执 行随机接入过程, 自行选择一个公共前导, 包含 RA-RNTI, 通过 Cell2的 PRACH, 发 送给基站; 步骤 3 : 基站收到该公共前导, 计算 TA, 分配 Temporary C-RNTI, 生成随机接入 响应消息在 Cell2 的 DL-SCH 发送给终端, 该消息中包含 TA、 初始上行授权和 Temporary C-RNTI;该消息通过 Pcell上 Cell2相关的 PDCCH上的 RA-RNTI进行指示; 步骤 4:终端在 Cell2上的 UL-SCH上发送首个被调度传输;该消息包含 C-RNTI, 等待 msg4; 步骤 5: 基站在 Cell2的 DL-SCH上发送冲突解决消息; 该消息通过 Pcell上 Cell2 相关的 PDCCH上的 C-RNTI进行指示, 还包含 UL grant; 步骤 6: UE收到 msg4后, 检查到是 Cell2的 C-RNTI指示, 还包含 UL grant, 认 为冲突解决, 认为 Cell2上的随机接入过程成功完成, 获得上行同步; 步骤 7: 基站在 Cell2的 DL-SCH发送下行分配 (DL assignment), 通过 Pcell上 Cell2相关的 PDCCH上的 C-RNTI指示; 步骤 8: UE收到 DL assignment, 按照正常的数据接收。 上述实例分别介绍了不同情况下, UE如何确定冲突解决的方式,通过这些方式可 以看出, UE能够准确地区分出接收的消息是否为冲突解决消息,进而完成辅服务小区 的接入过程, 获得上行同步, 避免了 UE间的冲突。 实施例 2 本实施例提供了一种用户设备, 参见图 8, 该用户设备包括以下模块: 消息接收模块 82, 设置为在辅服务小区上执行随机接入的过程中, 当发送首个被 调度传输消息后, 接收辅服务小区的消息。 其中, 用户设备在辅服务小区上执行随机接入的过程的触发方式可以包括以下之 一: 用户设备接收到基站的辅服务小区接入通知; 用户设备根据基站预配置的信息确 定主服务小区与辅服务小区采用不同的 TA,确定在辅服务小区上执行上行同步。在这 两种情况下, 用户设备均会对激活的辅服务小区进行随机接入。 检查模块 84, 与消息接收模块 82相连, 设置为检查上述消息是否包含服务小区 的 C-RNTI。 判断模块 86, 与检查模块 84相连, 设置为检查模块 84 的检查结果为包含上述
C-RNTI时, 判断消息是否为冲突解决消息。 确定模块 88, 与判断模块 86相连, 设置为判断模块 86的判断结果是冲突解决消 息时, 确定冲突解决, 并确定该辅服务小区接入过程成功完成。 本实施例在收到含有该辅服务小区的 PDCCH的 C-RNTI后, 不会立即认为冲突 已解决, 而是进一步确认该消息是否为冲突解决消息, 在是冲突解决消息时, 才会认 为确认冲突解决,该辅服务小区接入成功,解决了 Scell的随机接入过程中的冲突问题, 使得 UE能正常进行数据收发, 避免了随机接入过程的冲突解决的误判, 减少给其他 UE的干扰。 其中, 判断模块 86判断该消息是否为冲突解决消息可以包括以下方式: 1 )判断模块 86包括: 第一判断单元, 设置为判断消息是否携带有下行分配指示; 第一确定单元, 设置为第一判断单元的判断结果为消息携带有下行分配指示时, 确定 消息不是冲突解决消息; 第二确定单元, 设置为第一判断单元的判断结果为消息没有 携带有下行分配指示, 确定消息为冲突解决消息。 2) 判断模块 86包括: 第三确定单元, 设置为当消息携带有上行授权指示时, 确 定消息是冲突解决消息。
3 ) 判断模块 86包括: 第四确定单元, 设置为当消息携带有上行授权指示和填充 指示时, 确定消息是冲突解决消息。 如果该消息不是冲突解决消息, 用户设备接收该消息后, 继续等待接收下一个消 息 (即继续等待接收冲突解决消息状态)。 本实施例在 Scell激活后执行冲突的随机接入过程时, UE检测到正在执行随机接 入过程的 Scell相关的 PDCCH, 收到 C-RNTI指示, 还可以包含了除 DL分配以外的 信息, 则认为冲突解决。 例如: 该信息可以为空, 或者是一个新的传输的 UL授权, 或者包含新的传输的 UL授权和 padding (填充指示)。 工业实用性: 本发明技术方案针对多个小区接入的情况, 用户设备在辅服务小区的随机接入过 程中, 需要等待冲突解决消息, 在等待的过程中对接收的消息先判断该消息是针对哪 个服务小区的, 针对辅服务小区时, 在进一步确认该消息是否为冲突解决消息, 在是 冲突解决消息时, 才会认为冲突解决, 认为该辅服务小区接入过程成功完成, 解决了 Scell的随机接入过程中的冲突问题, 使得 UE能正常进行数据收发, 避免了随机接入 过程的冲突解决的误判, 减少给其他 UE的干扰, 提高了整个系统的性能。 从以上的描述中可以看出, 上述实施例针对多个小区接入的情况, 用户设备在辅 服务小区的随机接入过程中, 需要等待冲突解决消息, 在等待的过程中对接收的消息 先判断该消息是针对哪个服务小区的, 针对辅服务小区时, 在进一步确认该消息是否 为冲突解决消息, 在是冲突解决消息时, 才会认为冲突解决, 认为该辅服务小区接入 过程成功完成, 解决了 Scell的随机接入过程中的冲突问题, 使得 UE能正常进行数据 收发, 避免了随机接入过程的冲突解决的误判, 减少给其他 UE的干扰。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 并且在某些情况下, 可以以不同于此处 的顺序执行所示出或描述的步骤, 或者将它们分别制作成各个集成电路模块, 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样, 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技 术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的 任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种辅服务小区随机接入的方法, 包括:
用户设备在辅服务小区上执行随机接入的过程中, 当发送首个被调度传输 消息后, 接收所述辅服务小区的消息;
所述用户设备检查所述消息是否包含服务小区的小区 -无线网络临时标识
C-RNTI;
如果包含所述 C-RNTI, 所述用户设备判断所述消息是否为冲突解决消息; 如果是冲突解决消息, 所述用户设备确定冲突解决, 并确定所述辅服务小 区接入过程成功完成。
2. 根据权利要求 1所述的方法, 其中, 所述用户设备判断所述消息是否为冲突解 决消息包括:
所述用户设备判断所述消息是否携带有下行分配指示;
如果携带有所述下行分配指示, 所述用户设备确定所述消息不是冲突解决 消息;
如果没有携带有所述下行分配指示, 所述用户设备确定所述消息为冲突解 决消息。
3. 根据权利要求 1所述的方法, 其中, 所述用户设备判断所述消息是否为冲突解 决消息包括:
当所述消息携带有上行授权指示时, 所述用户设备确定所述消息是冲突解 决消息。
4. 根据权利要求 1所述的方法, 其中, 所述用户设备判断所述消息是否为冲突解 决消息包括:
当所述消息携带有上行授权指示和填充指示时, 所述用户设备确定所述消 息是冲突解决消息。
5. 根据权利要求 1-4任一项所述的方法, 其中, 所述用户设备在辅服务小区上执 行随机接入的过程的触发方式包括以下之一:
用户设备接收到基站的辅服务小区接入通知; 用户设备根据基站预配置的信息确定主服务小区与辅服务小区采用不同的 定时提前 TA, 确定在所述辅服务小区上执行上行同步。 根据权利要求 1-4任一项所述的方法, 其中, 所述方法还包括:
如果所述消息不是冲突解决消息, 所述用户设备接收所述消息后, 继续等 待接收下一个消息。 一种用户设备, 包括:
消息接收模块, 设置为在辅服务小区上执行随机接入的过程中, 当发送首 个被调度传输消息后, 接收所述辅服务小区的消息;
检查模块,设置为检查所述消息是否包含服务小区的小区-无线网络临时标 识 C-RNTI;
判断模块, 设置为所述检查模块的检查结果为包含所述 C-RNTI时, 判断 所述消息是否为冲突解决消息;
确定模块, 设置为所述判断模块的判断结果是冲突解决消息时, 确定冲突 解决, 并确定所述辅服务小区接入过程成功完成。 根据权利要求 7所述的用户设备, 其中, 所述判断模块包括:
第一判断单元, 设置为判断所述消息是否携带有下行分配指示; 第一确定单元, 设置为所述第一判断单元的判断结果为所述消息携带有所 述下行分配指示时, 确定所述消息不是冲突解决消息;
第二确定单元, 设置为所述第一判断单元的判断结果为所述消息没有携带 有所述下行分配指示, 确定所述消息为冲突解决消息。 根据权利要求 7所述的用户设备, 其中, 所述判断模块包括: 第三确定单元, 设置为当所述消息携带有上行授权指示时, 确定所述消息 是冲突解决消息。 根据权利要求 7所述的用户设备, 其中, 所述判断模块包括: 第四确定单元, 设置为当所述消息携带有上行授权指示和填充指示时, 确 定所述消息是冲突解决消息。
PCT/CN2012/071350 2011-07-05 2012-02-20 辅服务小区随机接入的方法和用户设备 WO2013004084A1 (zh)

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