WO2012130055A1 - 多载波聚合系统中的上行传输方法和设备 - Google Patents
多载波聚合系统中的上行传输方法和设备 Download PDFInfo
- Publication number
- WO2012130055A1 WO2012130055A1 PCT/CN2012/072459 CN2012072459W WO2012130055A1 WO 2012130055 A1 WO2012130055 A1 WO 2012130055A1 CN 2012072459 W CN2012072459 W CN 2012072459W WO 2012130055 A1 WO2012130055 A1 WO 2012130055A1
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- WIPO (PCT)
- Prior art keywords
- cell
- downlink
- downlink carrier
- uplink
- terminal
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
Definitions
- the present invention relates to the field of wireless communications, and in particular, to an uplink transmission method and apparatus in a multi-carrier aggregation system. Background technique
- LTE-A Long-Term Evolution Advanced
- LTE-A Long-Term Evolution Advanced
- CA Carrier Aggregation
- the carrier aggregation technology refers to a mechanism in which a UE (User Equipment) can simultaneously aggregate multiple cells (cells), and multiple cells can simultaneously provide data transmission services for the UE.
- the carriers corresponding to the respective cells may be continuous or discontinuous in the frequency domain.
- the maximum bandwidth of each component carrier is 20 MHz, and the bandwidth between the component carriers may be the same or different.
- the cell working in the terminal is divided into a PCell (Primary Cell) and a number of SCells (Secondary Cell).
- the primary cell undertakes most of the control signaling transmission, such as sending uplink data to the downlink. Feedback information, CQI (Channel Quality Indicator) reporting, uplink pilot transmission, etc.
- the secondary cell is mainly used as a resource to perform data transmission.
- the random access in the LTE system is divided into two types: non-contention random access and contention random access.
- the process of non-contention random access is shown in Figure 2 , which is divided into the following three steps:
- Message 0 The base station allocates a dedicated ra-Preamblelndex (Analog Access Preamble Index) for non-contention random access to the UE and a PRACH (Physical Random Access Channel) for random access.
- Ra-PRACH-Masklndex mask number of the physical random access channel.
- the PDCCH Physical Downlink Control Channel
- the PDCCH Physical Downlink Control Channel
- the non-contention random access carries this information through RRC (Radio Resource Control) signaling.
- Message 1 The UE sends the specified dedicated preamble to the base station on the specified PRACH resource according to the ra-Preamblelndex and ra-PRACH-Masklndex indicated by the MsgO. After receiving the Msgl, the base station calculates the uplink TA (Time Alignment) according to Msgl.
- Message 2 The base station sends a random access response to the UE, where the random access response includes the TA information and a UL grant (uplink scheduling signaling) for allocating resources for the subsequent uplink transmission, and the TA is used for the UE to subsequently determine the timing of the uplink transmission. relationship.
- the PDCCH carrying the Msg2 is scrambled by using the RA-RNTI (Random Access Channel Radio Network Temporary Identity).
- the RA-RNTI uniquely corresponds to the time-frequency resource of the Msgl in the 10ms window; Preamble ID (preamble ID), the UE determines, by the RA-RNTI and the preamble ID, that the Msg2 is a message corresponding to the Msgl sent by the UE.
- Msgl The UE selects random access reamble and PRACH resources and uses the PRACH resource to send the selected random access reamble to the base station;
- the base station receives the reamble, calculates the TA, and sends a random access response to the UE, where the random access response includes at least the TA information and the UL grant for the Msg3;
- Msg3 The UE sends an uplink transmission on the resource specified by the UL grant in the Msg2.
- the content of the Msg3 uplink transmission is different for different random access reasons. For example, for the initial access, the Msg3 transmits an RRC connection establishment request.
- Msg4 The base station sends a contention resolution 3 message to the UE, and the UE can determine whether the random access is successful according to Msg4.
- the transmission time of the Msgl needs to refer to the starting point of the downlink radio frame of a certain cell.
- the Msgl transmission timing is adjusted according to the timing advance amount, and the timing advance adjustment amount of Msgl is ⁇ TA + ⁇ A ⁇ JX ⁇ : , where: TA is the timing advance used for the previous timing adjustment.
- the amount of adjustment, for the random access MSgl the value is 0;
- 3GPP Three Generation Partnership Project
- Scenario 1 The scene of the RRH (remote radio head) is introduced, as shown in Figure 4.
- F1 provides large-scale coverage
- F2 uses RRH for hotspot coverage in Fl cell
- mobility management is based on F1.
- the F1 cell and the F2 cell can be aggregated, but the uplink TA (UL TA) of the Fl cell and the F2 cell are different.
- UL TA uplink TA
- Scenario 2 Introducing a repeater (relay) scene, as shown in Figure 5.
- the base station supports F1 and F2, F1 provides large-scale coverage, and F2 has a small coverage.
- the frequency selective repeater can extend the coverage of F2.
- the UE is located in the overlapping area of F1 cell and F2 cell, Fl Cell and F2 cell can be aggregated, but Fl cell and F2 cell The UL TA is different. 4
- the TA group (TA group) is introduced.
- the UL CC Uplink Component Carrier
- the TAs of UL CCs belonging to cells of different TA groups are not the same.
- the UE In a TA group, the UE only needs to maintain uplink synchronization with one of the cells to implement uplink synchronization for all cells in the TA group.
- the embodiment of the present invention provides an uplink transmission method and device in a multi-carrier aggregation system, which is used to solve the problem of how to perform uplink transmission in the secondary cell when the base station adds a secondary cell to the terminal.
- a method for determining a downlink reference downlink carrier comprising:
- the terminal After the terminal adds the secondary cell to the terminal, the terminal selects one carrier from the downlink carrier corresponding to the cell that has established the downlink synchronization with the base station as the timing reference downlink carrier used by the secondary cell according to the preset reference carrier selection rule.
- the terminal performs uplink transmission in the secondary cell according to the downlink timing of the downlink carrier.
- a terminal comprising:
- the reference carrier determining unit is configured to: after the base station adds the secondary cell to the terminal, select a carrier from the downlink carrier corresponding to the cell that has established downlink synchronization with the base station, and use the carrier as the secondary cell according to the preset reference carrier selection rule. Timing reference downlink carrier;
- the uplink transmission unit is configured to perform uplink transmission in the secondary cell according to the downlink timing of the downlink carrier according to the timing reference.
- the terminal after the base station adds a secondary cell to the terminal, the terminal according to the preset parameter
- the carrier selection rule is to select one carrier from the downlink carrier corresponding to the cell that has established the line synchronization with the base station as the timing reference downlink carrier used by the secondary cell, and perform uplink transmission in the secondary cell according to the downlink timing of the downlink carrier. It can be seen that, in the carrier aggregation system, when the base station adds a secondary cell to the terminal, the base station can determine the timing reference downlink carrier used by the secondary cell for uplink transmission, and further perform uplink transmission by referring to the downlink carrier according to the timing.
- FIG. 3 is a schematic diagram of an Msgl transmission timing advance reference in the prior art
- FIG. 4 is a schematic diagram of a multi-TA scenario in which an RRU is introduced in the prior art
- FIG. 5 is a schematic diagram of a multi-TA scenario introduced into a repeater in the prior art
- FIG. 6 is a schematic flowchart of a method according to an embodiment of the present disclosure.
- FIG. 7A is a schematic diagram of timing advance adjustment according to Embodiment 2 of the present invention.
- FIG. 7B is a schematic diagram of timing advance adjustment according to Embodiment 3 of the present invention.
- FIG. 7C is a schematic diagram of timing advance adjustment according to Embodiment 4 of the present invention.
- FIG. 7D is a schematic diagram of timing advance adjustment according to Embodiment 6 of the present invention.
- FIG. 8 is a schematic structural diagram of a device according to an embodiment of the present invention. detailed description
- the embodiment of the present invention provides a uplink transmission method in the multi-carrier aggregation system.
- an uplink transmission method in a multi-carrier aggregation system includes the following steps:
- Step 60 After the base station adds the secondary cell to the terminal, the terminal selects one of the downlink carriers corresponding to the cell that has established the downlink synchronization with the base station according to the preset reference carrier selection rule.
- the carrier is used as the timing reference line carrier used by the secondary cell; where the timing reference downlink carrier refers to the downlink carrier used in determining the data transmission time of the uplink transmission;
- Step 61 The terminal refers to the downlink timing of the downlink carrier according to the timing, and performs uplink transmission in the secondary cell.
- step 60 the terminal selects one carrier from the downlink carriers corresponding to the cell that has established the downlink synchronization with the base station as the timing reference downlink carrier used by the secondary cell according to the preset reference carrier selection rule, and the specific implementation may be as follows: Seven ways:
- the terminal selects a downlink reference carrier used by the cell in the TA group to which the UE belongs and has established uplink synchronization with the base station, and serves as a timing reference downlink carrier used by the secondary cell;
- the terminal selects a downlink carrier corresponding to the primary cell, and uses the downlink reference carrier as a timing used by the secondary cell.
- the terminal selects a downlink component carrier corresponding to the cell that successfully initiates the random access in the TA group to which it belongs, as the timing reference downlink carrier used by the secondary cell;
- the terminal selects a downlink component carrier corresponding to the cell that is activated and has the smallest number in the TA group to which the UE belongs, and uses the downlink reference carrier as the secondary reference used by the secondary cell;
- the terminal selects a downlink carrier corresponding to the secondary cell, and uses the downlink reference carrier as a timing used by the secondary cell.
- the terminal selects a downlink carrier that is not in the TA group to which the UE belongs and that has established uplink synchronization with the base station, and uses the downlink carrier as the timing used by the secondary cell.
- the eNB receives the PDCCH command that triggers the terminal to perform random access.
- the downlink carrier used is used as a timing reference downlink carrier used by the secondary cell;
- the terminal selects a downlink carrier corresponding to the pre-configured cell of the base station, and uses the downlink reference carrier as the timing referenced by the secondary cell.
- the base station may pre-configure a downlink carrier that can be used as a reference downlink carrier or a cell corresponding to the downlink carrier by using (RRC) signaling.
- step 61 The specific implementation of step 61 can be as follows:
- the terminal determines an uplink TA used for uplink transmission in the secondary cell
- the terminal is based on the downlink timing of the timing reference downlink carrier, according to the determined uplink TA.
- the following is an example of how the terminal determines the uplink TA used for uplink transmission in the secondary cell:
- Example 1 in the timing reference downlink carrier is a timing reference downlink carrier used by a cell in the TA group to which the terminal belongs and establishing uplink synchronization with the base station, or, for the terminal, selecting the timing advance amount to which the terminal belongs, the last successfully initiated random in the TA group
- the terminal terminal determines an uplink TA used by the cell that has established uplink synchronization with the base station, and determines the uplink TA as an uplink TA used for uplink transmission in the secondary cell.
- Example 2 The downlink carrier corresponding to the downlink carrier as the primary cell, or the downlink carrier corresponding to the secondary cell, or the downlink carrier corresponding to the cell that has not established uplink synchronization with the base station in the TA group to which the terminal belongs, or the base station is pre-configured.
- the terminal determines that the secondary cell first determines that the terminal sends a random connection to the base station according to the downlink timing of the downlink carrier, after receiving the PDCCH command sent by the base station to trigger the random access of the terminal. Transmitting a preamble transmission time, and transmitting a random access preamble to the base station at the transmission time; where, the transmission time t of transmitting the random access preamble to the base station may be determined according to the following formula:
- t tO- ⁇ TA offset *T s , where t0 is the time at which downlink data is received in a certain downlink subframe of the timing reference downlink carrier, W TA .
- Ffset is an offset, related to the duplex mechanism. For FDD,
- Example 3 When the downlink carrier corresponding to the downlink carrier is the reference downlink carrier, or the downlink carrier corresponding to the cell that has established the uplink synchronization with the base station in the TA group to which the terminal belongs, or the downlink carrier corresponding to the pre-configured cell of the base station, The terminal may determine the uplink TA used for uplink transmission in the secondary cell according to the following formula:
- the uplink TA the difference between the downlink TA used by the cell corresponding to the downlink carrier and the downlink TA used by the cell corresponding to the downlink reference carrier.
- the core idea of the present invention is that when the base station adds a SCell to the terminal, it is necessary to determine the only downlink reference carrier for the new SCell uplink timing advance acquisition and use, as follows: If a cell has established uplink synchronization, the newly added SCell and the cell that has established uplink synchronization in the TA group use the same timing reference downlink carrier.
- one of the following downlink carriers may be determined as the timing reference downlink carrier of the newly added Scell:
- the downlink carrier corresponding to a certain cell of the uplink synchronization is currently established, for example, the carrier transmitted by the PDCCH order;
- a downlink carrier of a certain cell configured by the base station by using RRC signaling
- Embodiment 1 A new SCell is used, and a cell that has established uplink synchronization in the TA group uses the same timing reference downlink carrier;
- Step 1 The terminal establishes an RRC connection on the PCell.
- the terminal establishes an RRC connection with the base station through the random access procedure on Cell-1, and then Cell-1 can function as a PCell.
- the timing reference downlink carrier used by Msgl is the downlink carrier of Cell-1;
- Step 2 The base station performs SCell addition.
- the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process.
- the increased cell number is Cell-4.
- Step 3 Add the uplink timing advance of the Scell.
- Cell-4 and Cell-1 belong to the same TA group, it can be determined that Cell-4 can use the same uplink timing advance and timing reference downlink carrier as Cell-1.
- Step 4 Perform uplink data transmission on the newly added SCell.
- the terminal uses the timing determined in step 3 to refer to the downlink timing of the downlink carrier, and performs subsequent uplink data transmission according to the uplink timing advance determined in step 3.
- Embodiment 2 The newly added SCell and the last successfully activated cell in the TA group use the same timing reference carrier.
- Step 1 The terminal performs carrier aggregation
- the terminal aggregates two TA groups, one is the pTAG containing the Pcell, and the other is the sTAG containing the Cell-1, and both TA groups have established uplink synchronization.
- Step 2 The base station performs SCell addition.
- the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process. Assume that the added cell number is Cell-4, and Cell-1 belongs to a TA group.
- Step 3 Add the uplink timing advance of the Scell.
- Cell-4 and Cell-1 belong to the same TA group, and Cell-1 is the last cell in the TA group that successfully initiates random access, it can be determined that Cell-4 can use the same uplink timing advance as Cell-1.
- the quantity and timing refer to the downlink carrier.
- Step 4 Perform uplink data transmission on the newly added SCell.
- the terminal uses the timing determined in step 3 to refer to the downlink timing of the downlink carrier, and performs subsequent uplink data transmission according to the uplink timing advance determined in step 3.
- Step 5 Change the random access cell;
- the timing reference downlink carrier of all the cells in the TA group is changed to Cell-4, and the new SCell is added in the TA group, and the SCell is added before the SCell is added. If no new RA occurs in the TA group, then the downlink component carrier corresponding to Cell-4 can also be used as its timing reference carrier.
- Embodiment 3 The SCell uses the downlink carrier activated by the TA group and having the smallest or largest cell as the downlink timing reference carrier of the uplink transmission.
- Step 1 The terminal performs carrier aggregation
- the terminal aggregates two TA groups, one is the pTAG containing the Pcell, and the other is the sTAG containing the Cell-1, and both TA groups have established uplink synchronization.
- Step 2 The base station performs SCell addition.
- the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process. Assume that the added cell number is Cell-4, and Cell-1 belongs to a TA group.
- Step 3 Add the uplink timing advance of the Scell.
- Timing reference downlink carrier Since Cell-4 and Cell-1 belong to the same TA group, and Cell-1 is the activated and lowest numbered cell in the TA group, it can be determined that Cell-4 can use the same uplink timing advance as Cell-1. Timing reference downlink carrier. Of course, if the timing reference carrier of the TA group is selected according to the principle of activation and maximum number, then the downlink carrier corresponding to Cell-4 should be selected.
- Step 4 Perform uplink data transmission on the newly added SCell.
- the terminal uses the timing determined in step 3 to refer to the downlink timing of the downlink carrier, and performs subsequent uplink data transmission according to the uplink timing advance determined in step 3.
- Embodiment 4 using a downlink carrier of the PCell as a timing reference downlink carrier;
- Step 1 The terminal establishes an RRC connection on the PCell.
- the terminal establishes an RRC connection with the base station through the random access procedure on the Cell-1, and the Cell-1 can be used as the PCell.
- the timing reference downlink carrier used by Msgl is the downlink carrier of Cell-1;
- Step 2 The base station performs SCell addition. As the amount of data in the terminal increases, the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process. Assume that the added cell number is Cell-2.
- Step 3 Add the uplink timing advance of the Scell.
- the base station may send a PDCCH order on the Cell-1 to trigger the terminal to perform random access on the Cell-2.
- the timing reference downlink carrier used by the Msgl uplink transmission and the downlink carrier of the Cell-1 (ie, PCell) may be used as the downlink carrier.
- the downlink carrier is referenced periodically, as shown in Figure 7A.
- the base station After the terminal sends the Msgl on the Cell-2, the base station receives the preamble, and the base station determines the uplink timing advance on the Cell-2 according to the difference between the expected reception time and the actual reception time.
- Step 4 Notifying the terminal of the uplink timing advance on the newly added SCell
- the base station sends the timing advance on Cell-2 obtained in step 3 to the terminal through Ms g 2, and sets the terminal to receive the timing advance in subframe n, then the terminal is in subframe n+k, according to the timing advance
- Step 5 All subsequent carriers in the TA group to which the Scell belongs are used as the downlink reference carrier of the PCell.
- Embodiment 5 The downlink carrier corresponding to the new SCell is used as the timing reference downlink carrier; Step 1: The RRC connection is established on the PCell;
- the base station establishes an RRC connection with the base station through the random access procedure on Cell-1, and sets Cell-1 as a PCell.
- the timing reference downlink carrier used by Msgl is the downlink carrier of Cell-1;
- Step 2 The base station performs SCell addition.
- the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process. Assume that the added cell number is Cell-2.
- Step 3 Add the uplink timing advance of the Scell.
- Timing advance One way to get the upstream 3 ⁇ 4 advance on Cell-2 is by random access on Cell-2.
- the base station may send a PDCCH order on any cell that has established uplink synchronization (including the PCell and the SCell) to trigger the terminal to perform random access on the Cell-2.
- the timing reference downlink carrier used by the Msgl uplink transmission which is the simplest.
- the method is to use the downlink carrier of the current cell as the timing reference downlink carrier, as shown in FIG. 7B.
- the base station After the terminal sends the Msgl on the Cell-2, the base station receives the preamble, and the base station determines the uplink timing advance on the Cell-2 according to the difference between the expected reception time and the actual reception time.
- Step 4 Notifying the terminal of the uplink timing advance on the newly added SCell
- the base station sends the timing advance on Cell-2 obtained in step 3 to the terminal through Ms g 2, and sets the terminal to receive the timing advance in subframe n, then the terminal is in subframe n+k, according to the timing advance
- Step 5 All subsequent carriers in the TA group to which the Scell belongs are used as the downlink reference carrier of the Cell-2.
- Embodiment 6 The DL carrier of a certain cell (which may be a PCell or a SCell) that has established uplink synchronization is used as a timing reference downlink carrier.
- the base station sends a downlink carrier used by the PDCCH order that triggers the terminal to perform random access.
- Step 1 The RRC connection is established on the PCell.
- the base station establishes an RRC connection with the base station through the random access procedure on Cell-1, and sets Cell-1 as a Pcell.
- the timing reference downlink carrier used by Msgl is the downlink carrier of Cell-1;
- Step 2 The base station performs SCell addition.
- the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process. Assume that the added cell number is Cell-3 and the base station establishes uplink synchronization on Cell-3. For details, refer to Embodiments 1 and 2.
- Step 3 The base station continues to perform SCell addition
- the area is Cell-1 (Pcell) and Cell-3.
- the base station- ⁇ transmits the PDCCH order on any cell that has established uplink synchronization to trigger the terminal to perform random access on the Cell-2, and which cell is used to transmit the PDCCH order, the cell can be used as the timing reference downlink on the Cell-2.
- Carrier Assuming that the base station sends a PDCCH order on Cell-3, triggering Cell-2 to perform random access, then the downlink carrier of Cell-3 can be used as the timing reference downlink carrier of Cell-2, as shown in Fig. 7C.
- the base station After the terminal sends the Msgl on the Cell-2, the base station receives the preamble, and the base station determines the uplink timing advance on the Cell-2 according to the difference between the expected reception time and the actual reception time.
- Step 4 Notifying the terminal of the uplink timing advance on the newly added SCell
- the base station sends the timing advance on Cell-2 obtained in step 3 to the terminal through Ms g 2, and sets the terminal to receive the timing advance in subframe n, then the terminal is in subframe n+k, according to the timing advance
- the uplink timing advance used by Msgl is corrected, and the uplink timing of the Cell-3 is used as a reference, and the uplink transmission is performed according to the corrected timing advance.
- Step 5 All subsequent carriers in the TA group to which the Scell belongs are used as the downlink reference carrier of the Cell-3.
- Embodiment 7 The DL carrier of a certain cell that has established uplink synchronization is used as a timing reference downlink carrier, and the cell may be a PCell or a SCell. This method is only applicable to TDD systems.
- Step 1 The RRC connection is established on the PCell.
- the base station establishes an RRC connection with the base station through the random access procedure on Cell-1, and sets Cell-1 as a PCell.
- the timing reference downlink carrier used by Msgl is the downlink carrier of Cell-1;
- Step 2 The base station performs SCell addition.
- the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process. Assume that the added cell number is Cell-2.
- Step 3 Add the uplink timing advance of the Scell.
- the Cell-2 can use the downlink carrier of a certain cell (where the uplink synchronization cell is PCell) that has established the uplink synchronization as the timing reference downlink carrier, and can refer to the reference cell and the cell.
- the difference between the timing advance amount between the downlink carriers and the uplink timing advance amount on the reference cell determines the uplink timing advance on Cell-2.
- the uplink timing advance on Cell-2 the uplink timing advance on Cell-1 + the difference between Cell-2 and Cell-1 downlink timing.
- Step 4 The terminal uses the newly added SCell for data transmission
- the PCell with the uplink synchronization is established as the timing reference downlink carrier, and based on the starting point of the PCell-based radio frame, the uplink data transmission is performed according to the uplink timing advance amount obtained in step 3.
- Step 5 All subsequent carriers in the TA group to which the Scell belongs are used as the downlink reference carrier of the PCell.
- Embodiment 8 a downlink carrier configured by using RRC signaling is used as a timing reference downlink carrier; Step 1: RRC connection establishment on the PCell;
- the base station establishes an RRC connection with the base station through the random access procedure on Cell-1, and sets Cell-1 as a PCell.
- the timing reference downlink carrier used by Msgl is the downlink carrier of Cell-1;
- Step 2 The base station performs SCell addition.
- the base station needs to add a configured cell to the terminal, and the SCell addition can use the RRC reconfiguration process. Assume that the added cell number is Cell-2. At the same time, the base station configures the downlink reference carrier of the cell to be the downlink carrier corresponding to Cell-1 through RRC signaling.
- Step 3 Add the SCell uplink timing advance amount to obtain
- the eNB may send a PDCCH order on any available DL carrier, and trigger the terminal to perform random access on the Cell-2.
- the timing reference downlink carrier used for the Msgl uplink transmission needs to be determined, and the terminal may use the Cell according to the RRC signaling configuration of the base station.
- the downlink carrier of 1 is used as the timing reference downlink carrier, as shown in Figure 7D.
- Step 4 Notifying the terminal of the uplink timing advance on the newly added SCell
- the base station sends the timing advance on Cell-2 obtained in step 3 to the terminal through Ms g 2, and sets the terminal to receive the timing advance in subframe n, then the terminal is in subframe n+k, according to the timing advance
- the uplink timing advance used by the Msgl is corrected, and based on the DL timing of the Cell-1 configured by the base station, the uplink transmission is performed according to the corrected timing advance.
- Step 5 All the carriers in the TA group to which the Scell belongs are added with the downlink carrier on Cell-1 configured by RRC signaling as the timing reference downlink carrier.
- an embodiment of the present invention further provides a terminal, including:
- the reference carrier determining unit 80 is configured to: after the base station adds the secondary cell to the terminal, select a carrier from the downlink carrier corresponding to the cell that has established downlink synchronization with the base station, and use the carrier as the secondary cell according to the preset reference carrier selection rule. Timing reference downlink carrier;
- the uplink transmission unit 81 is configured to perform uplink transmission in the secondary cell according to the downlink timing of the downlink carrier according to the timing.
- the reference carrier determining unit 80 is configured to:
- the downlink component carrier corresponding to the cell that successfully initiates the random access is used as the timing reference downlink carrier used by the secondary cell; or, the downlink component carrier corresponding to the cell with the smallest number of the activated timing group TA group is selected.
- the downlink carrier corresponding to the pre-configured cell of the base station is selected as the timing reference downlink carrier used by the secondary cell.
- the uplink transmission unit 81 is used to:
- the uplink transmission is performed in the secondary cell according to the determined uplink TA.
- the uplink transmission unit 81 is used to:
- the timing reference downlink carrier is a timing reference downlink carrier used by a cell in the TA group to which the terminal belongs and establishing uplink synchronization with the base station, or the timing advance amount of the TA group to which the terminal belongs is selected for the latest successful random access in the TA group.
- the uplink TA used by the cell that has established uplink synchronization with the base station is determined, and the uplink TA is determined as the uplink TA used for uplink transmission in the secondary cell.
- the uplink transmission unit 81 is used to:
- the downlink timing of the downlink carrier is determined according to the timing, and the sending moment of the random access preamble is sent to the base station, and the sending moment is Sending a random access preamble to the base station;
- the TA After receiving the random access response carrying the TA sent by the base station, the TA is determined as the uplink TA used for uplink transmission in the secondary cell.
- the uplink transmission unit 81 is used to:
- the formula determines the uplink TA used for uplink transmission in the secondary cell:
- the uplink TA the timing refers to the difference between the downlink TA used by the cell of the downlink carrier pair 7 and the downlink TA used by the cell corresponding to the timing reference downlink carrier.
- the downlink carrier corresponding to the cell that is not in the TA group to which the terminal belongs and has established uplink synchronization with the base station is:
- the base station sends the downlink carrier used by the PDCCH command that triggers the terminal to perform random access.
- the beneficial effects of the present invention include:
- the terminal selects one carrier from the downlink carrier corresponding to the cell that has established downlink synchronization with the base station according to the preset reference carrier selection rule.
- the timing used by the cell refers to the downlink carrier, and performs uplink transmission in the secondary cell according to the downlink timing of the downlink carrier according to the timing. It can be seen that the present invention solves the problem of how to determine the timing reference downlink carrier used by the secondary cell for uplink transmission when the base station adds a secondary cell to the terminal in the carrier aggregation system, and can further perform uplink transmission according to the determined timing reference downlink carrier.
- embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer-usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.
- a computer-usable storage medium including but not limited to disk storage, CD-ROM, optical storage, etc.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the computer readable memory is stored in the computer readable memory.
- the instruction generation in the process includes the manufacture of the instruction device.
- the instruction device implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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KR1020137028577A KR101531982B1 (ko) | 2011-03-31 | 2012-03-16 | 반송파 결합 시스템에서의 업링크 전송 방법 및 장치 |
EP12762885.7A EP2693801B1 (en) | 2011-03-31 | 2012-03-16 | Uplink transmission method and device for multi-carrier aggregation system |
US14/008,969 US9219589B2 (en) | 2011-03-31 | 2012-03-16 | Uplink transmission method and apparatus in carrier aggregation system |
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CN2011100803798A CN102118801B (zh) | 2011-03-31 | 2011-03-31 | 多载波聚合系统中的上行传输方法和设备 |
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CN102118801B (zh) | 2013-07-24 |
EP2693801B1 (en) | 2017-02-15 |
US20140233535A1 (en) | 2014-08-21 |
KR101531982B1 (ko) | 2015-06-26 |
EP2693801A4 (en) | 2014-04-16 |
US9219589B2 (en) | 2015-12-22 |
KR20140005310A (ko) | 2014-01-14 |
EP2693801A1 (en) | 2014-02-05 |
CN102118801A (zh) | 2011-07-06 |
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