CN110278608B - Uplink transmission method in multi-carrier aggregation system - Google Patents
Uplink transmission method in multi-carrier aggregation system Download PDFInfo
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- CN110278608B CN110278608B CN201810212789.5A CN201810212789A CN110278608B CN 110278608 B CN110278608 B CN 110278608B CN 201810212789 A CN201810212789 A CN 201810212789A CN 110278608 B CN110278608 B CN 110278608B
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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
- H04L5/0001—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
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Abstract
The application discloses an uplink transmission method in a multi-carrier aggregation system, which comprises the following steps: user Equipment (UE) receives a wireless reconfiguration message sent by a base station; the wireless reconfiguration message carries an uplink only SUL carrier identifier and PCI information of a cell to which the SUL carrier belongs, and is used for configuring the uplink only carrier for the UE when carrier aggregation is carried out; the UE configures a pure uplink carrier indicated by the SUL carrier identifier when the current cell or the newly added cell carries out carrier aggregation according to the PCI information; the UE performs uplink transmission by using the configured aggregation carrier; wherein, in each cell, the SUL carrier identifiers of the carriers are different from each other. By applying the method and the device, the configuration mode of the SUL carrier can be unified while the uploading of the large data volume service is realized.
Description
Technical Field
The present application relates to a multi-carrier aggregation technology, and in particular, to an uplink transmission method in a multi-carrier aggregation system.
Background
In order to provide higher service rates, 3GPP has proposed a rate requirement of 1Gbps downlink in the LTE-Advanced phase. Meanwhile, due to factors such as shortage of wireless spectrum resources, spectrum resources owned by many operators are often discontinuous, and each single frequency band is difficult to meet the requirement of LTE-Advanced on bandwidth. Therefore, carrier aggregation is introduced in the Release 10(TR 36.913) stage by 3GPP, and the user peak rate is multiplied by aggregating member carriers different in the same frequency band and different frequency bands to a larger bandwidth, so that the user peak rate can be multiplied by 40MHz to 100MHz, and the peak rate of 300Mbps to 750Mbps or even more than 1Gbps (4x4MIMO) is provided, so as to meet the requirements of 3 GPP.
In carrier aggregation defined by 3GPP, a CAUE supports asymmetric carrier aggregation, that is, the number of component carriers aggregated in downlink and uplink may be different, but the number of uplink component carriers cannot be greater than that in downlink.
Meanwhile, the concept of PCell/SCell is also introduced into 3GPP carrier aggregation. Specifically, the PCell (Primary Cell) is a Cell where the UE performs initial connection establishment, or performs RRC connection reestablishment, or is a Primary Cell designated in a handover process. The PCell is responsible for RRC communication with the UE. SCell (Secondary Cell) is a Cell added at RRC reconfiguration to provide additional radio resources, without any RRC communication between SCell and UE. As can be seen from the above, the PCell is determined at the time of Connection establishment (Connection establishment), and the SCell is added/modified/released through an RRC Connection Reconfiguration message (RRC Connection Reconfiguration) after an initial security activation procedure (initial security activation procedure).
Disclosure of Invention
The application provides an uplink transmission method in a multi-carrier aggregation system, which can realize uploading of large data volume services and simultaneously unify the configuration mode of SUL carriers.
In order to achieve the purpose, the following technical scheme is adopted in the application:
an uplink transmission method in a multi-carrier aggregation system includes:
user Equipment (UE) receives a wireless reconfiguration message sent by a base station; the wireless reconfiguration message carries an uplink only SUL carrier identifier and PCI information of a cell to which the SUL carrier belongs, and is used for configuring the uplink only carrier for the UE when carrier aggregation is carried out;
the UE configures a pure uplink carrier indicated by the SUL carrier identifier when the current cell or the newly added cell carries out carrier aggregation according to the PCI information;
the UE performs uplink transmission by using the configured aggregation carrier;
wherein, in each cell, the SUL carrier identifiers of the carriers are different from each other.
Preferably, when the radio reconfiguration message is used to perform carrier aggregation reconfiguration, the configuring the pure uplink carrier indicated by the SUL carrier identifier when the current cell or the newly added cell performs carrier aggregation includes:
the UE compares the PCI information carried in the wireless reconfiguration message with the PCI of the current cell, if the PCI information and the PCI information are the same, a pure uplink carrier is added or deleted in the current cell, and the added or deleted pure uplink carrier is the pure uplink carrier indicated by the SUL carrier identifier; and if the two are different, newly adding a special cell, and adding the pure uplink carrier indicated by the SUL carrier identifier into the newly added special cell.
Preferably, when the radio reconfiguration message is used in the handover process, the configuring the pure uplink carrier indicated by the SUL carrier identity when the current cell or the newly added cell performs carrier aggregation includes:
the UE compares the PCI information carried in the wireless reconfiguration message with the PCI in the mobility information during switching, if the PCI information carried in the wireless reconfiguration message is the same as the PCI in the mobility information during switching, a new pure uplink carrier is added in a target cell for switching, and the new pure uplink carrier is the pure uplink carrier indicated by the SUL carrier identifier; if the two are different, adding a new special cell after the switching, and adding the pure uplink carrier indicated by the SUL carrier identifier into the new special cell.
According to the technical scheme, in the application, the UE receives the wireless reconfiguration message sent by the base station; the wireless reconfiguration message carries a pure uplink (SUL) carrier identifier and PCI information and is used for configuring a pure uplink carrier for the UE when carrier aggregation is carried out; the UE configures a pure uplink carrier indicated by the SUL carrier identification when the current cell or the newly added cell carries out carrier aggregation according to the PCI information in the wireless reconfiguration message; the UE performs uplink transmission by using the configured aggregation carrier; wherein, in each cell, the SUL carrier identifiers of the carriers are different from each other. By carrying the PCI information and the SUL carrier identifier in the wireless reconfiguration message, pure uplink carriers can be configured for the UE in carrier aggregation, thereby implementing uploading of a large data volume service, and simultaneously, configuration in a unified format can be performed on the pure uplink carrier configuration of a newly added cell and the pure uplink carrier configuration of a current cell, which is convenient for processing and operation.
Drawings
Fig. 1 is a schematic basic flowchart of an uplink transmission method in the present application;
FIG. 2 is a schematic flow chart of a method according to a first embodiment of the present application;
fig. 3 is a schematic diagram of carrier aggregation reconfiguration in the present application;
fig. 4 is a schematic diagram of carrier add/delete in a cell in the present application;
FIG. 5 is a schematic flow chart of a method according to a second embodiment of the present application;
fig. 6 is a schematic diagram of carrier aggregation reconfiguration during handover.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
In practical networking applications, there is a need for a large bandwidth uplink service such as specific video upload, so that a configuration in which the number of uplink carriers is higher than that of downlink carriers is proposed in an LTE system, and a special cell can be established in the LTE system: the cell comprises a pair of FDD carriers and 1 or more pure uplink carriers, wherein the FDD downlink carrier is the only downlink carrier in the special FDD cell, the FDD uplink carrier is the uplink main carrier of the cell, and all the pure uplink carriers in the cell are the uplink auxiliary carriers of the cell. Such cells are referred to herein as special cells. If the UE has a strong parallel transmission capability, there may be a need for aggregation of multiple special cells, and when multiple special cells are aggregated, the SUL carrier cannot be configured by the existing carrier aggregation configuration message of 3 GPP.
The application provides an uplink transmission method in a multi-carrier aggregation system, which can realize the carrier aggregation configuration including the special cell, and perform uplink transmission by using aggregated carriers, thereby realizing the requirement of a large-bandwidth uplink service.
Fig. 1 is a basic flowchart of an uplink transmission method in the present application. As shown in fig. 1, the method includes:
The radio reconfiguration message of the present application includes the SUL carrier identity and PCI information. The PCI information is content already included in the existing radio reconfiguration message, and the SUL carrier identifier is a newly added cell in the present application. In each cell, the SUL carrier identities of the carriers are different, and the SUL carrier identities in different cells may be the same. Specifically, the SUL carrier id may be a SUL carrier index SULCarrierIndex, and the SULCarrierIndex is taken as the SUL carrier id for illustration in the following description. The sulcarrierie index of the primary carrier in each special cell may be set to 0 by default, and the sulcarrierie index of the secondary carrier may be allocated from 1, or of course, the sulcarrierie index of the primary carrier may be set to other specified values.
The radio reconfiguration message also includes a secondary cell index (scelllindex), where the value setting of the parameter may be in the same manner as in the prior art. The primary special cell scellndex is 1 and the secondary cell scellndex is allocated from 2.
And step 102, the UE configures the pure uplink carrier indicated by the SUL carrier identifier when the current cell or the newly added cell carries out carrier aggregation according to the PCI information in the wireless reconfiguration message.
And determining whether to perform SUL configuration on the newly added cell or the current cell through the PCI information in the wireless reconfiguration message. And then, carrying out specific carrier configuration according to the SUL carrier identifier.
In the method, the configuration format is unified for the SUL carrier configuration under the newly added cell, the current cell and the switching scene through the use of the PCI information and the introduction of the SUL carrier identifier, so that the system processing and operation are greatly simplified. In the following embodiments, the SUL carrier configuration will be specifically described according to different scenarios such as reconfiguration, handover, and the like.
And 103, the UE performs uplink transmission by using the configured aggregation carrier.
After the SUL carrier configuration, the UE performs uplink transmission by using the aggregated carrier. In this case, the SUL carrier is introduced into the carrier aggregation of the UE, so that the number of uplink carriers is greatly increased to implement the upload of a large data volume service.
So far, the basic flow of the uplink transmission method in the carrier aggregation system of the present application is finished.
The following is a detailed description of several specific embodiments.
The first embodiment is as follows:
in this embodiment, the base station performs special cell carrier aggregation reconfiguration on the UE. In this reconfiguration, for convenience, description is made through interaction between the UE and the base station. As shown in fig. 2, the reconfiguration procedure includes:
step 201, the base station performs carrier aggregation reconfiguration due to service needs.
Step 202, the base station sends a wireless reconfiguration message to the UE, where the message carries the SUL carrier id to be configured and the PCI information of the cell to which the SUL carrier id belongs.
The UE compares the PCI information carried in the wireless reconfiguration message with the PCI of the current cell, if the PCI information and the PCI information are the same, a new pure uplink carrier is added in the current cell, and the new pure uplink carrier is the pure uplink carrier indicated by the SUL carrier identifier; and if the two are different, newly adding a special cell, and adding the pure uplink carrier indicated by the SUL carrier identifier into the newly added special cell. That is, if the PCI in the cell reconfiguration information is the same as the PCI of the current cell, the reconfiguration is considered to be adding the SUL carrier in the current special cell; if the PCI is different from that of the current cell, it is considered to add a new special aggregation cell and the SUL carrier is added in the new cell.
As a simple example, the terminal firstly accesses from the primary carrier of the special cell PCI0, and then reconfigures to perform carrier aggregation on the FDD carrier and SUL carrier of the special cell PCI0 and the FDD carrier and SUL carrier of the special cell PCI1, and then the information PCI0 cell information that may be carried in the radio reconfiguration message is: scell index is 1, SULCarrier index is 0, 1; the PCI1 cell information is: scell index is 2, SULCarrier index is 0, 1. Wherein, PCI0 is a cell to which the terminal accesses, that is, a current cell, the UE configures a SUL carrier with a SULCarrier index of 1 in the cell, and simultaneously, adds a special cell PCI1, and adds a SUL carrier with a SULCarrier index of 1 in the cell. A schematic diagram of carrier aggregation according to the radio reconfiguration message is shown in fig. 3.
Step 203, the UE performs carrier aggregation configuration and sends MSG3 to the base station of each configured cell.
The flow in this embodiment is ended.
In addition, the addition and deletion of carriers in a cell are the same as the procedure shown in fig. 2, and the difference is only that the corresponding SUL carrier identity is indicated in the addition or deletion carrier in the radio reconfiguration message. If the SUL carrier is deleted, the corresponding SulCarriendex can be directly configured in release. As a simple example, as shown in fig. 4, in the PCI0 cell, carriers with sulcarrierendex of 1 are deleted, and carriers with sulcarrierendex of 2 are added.
Scene two:
in this embodiment, in the UE handover process, the base station performs special cell carrier aggregation configuration on the UE. In this embodiment, the terminal is handed over from the special cell PCI0 to the special cell PCI1 and the special cell PCI 2. For convenience, the description is made through interaction between the UE and the base station. As shown in fig. 5, the process includes:
in step 501, the UE sends a measurement report to the base station of the source special cell PCI 0.
Step 502, the base station of the source special cell triggers handover.
In step 504, the core network sends a handover request to the base stations of the target special cell PCI1 and PCI2 for handover.
And 505, the base station of the target special cell feeds back a confirmation message to the core network.
Step 506, the core network sends a handover command to the base station of the source special cell.
Step 507, the base station of the source special cell sends a radio reconfiguration message to the UE.
The UE compares the PCI information carried in the wireless reconfiguration message with the PCI in the mobility information during switching, if the PCI information and the PCI are the same, a new pure uplink carrier is added in the target cell for switching, and the new pure uplink carrier is the pure uplink carrier indicated by the SUL carrier identifier; if the two are different, a special cell is newly added after the switching, and a pure uplink carrier indicated by the SUL carrier identification is added into the newly added special cell. That is, if the PCI in the cell configuration information is the same as the PCI in the mobility information, the configuration information is considered to be that the SUL secondary carrier is added to the target special cell; and if the PCI in the cell configuration information is different from the PCI in the mobility information, the new special aggregation cell is considered to be added, and the SUL auxiliary carrier is added into the new cell.
In this embodiment, the PCI1 cell information carried in the wireless reconfiguration message is: the scellndex is 1, the sularrier index is 0, 1, and carries PCI2 cell information as: scell index is 2, SULCarrier index is 0, 1. A schematic diagram of carrier aggregation according to the radio reconfiguration message is shown in fig. 6.
In step 508, the UE sends a Preamble to the base station of the target special cell PCI 1.
In step 509, the base station of the target special cell PCI1 feeds back a random access response to the UE.
Step 510, after the UE performs carrier aggregation setting according to the message in step 507, the UE sends MSG3 to the base station of the target special cell.
The flow in this embodiment is ended.
The foregoing is a specific implementation of the present application. It can be seen from the above processing that the terminal can complete the reconfiguration once through the reconfiguration message of the radio link regardless of various scenarios such as the reconfiguration of the carrier aggregation in the special cell, the switching between the special cells, the reconfiguration of the carriers in the special cell with the addition and deletion, and the like, thereby realizing the uploading of the large data volume service.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. An uplink transmission method in a multi-carrier aggregation system, the method comprising:
user Equipment (UE) receives a wireless reconfiguration message sent by a base station; the wireless reconfiguration message carries an uplink only SUL carrier identifier and PCI information of a cell to which the SUL carrier belongs, and is used for configuring the uplink only carrier for the UE when carrier aggregation is carried out;
the UE configures a pure uplink carrier indicated by the SUL carrier identifier when the current cell or the newly added cell carries out carrier aggregation according to the PCI information;
the UE performs uplink transmission by using the configured aggregation carrier;
wherein, in each cell, the SUL carrier identifiers of the carriers are different from each other.
2. The method of claim 1, wherein when the radio reconfiguration message is used for performing carrier aggregation reconfiguration, the configuring the uplink-only carrier indicated by the SUL carrier identifier when the current cell or the newly added cell performs carrier aggregation comprises:
the UE compares the PCI information carried in the wireless reconfiguration message with the PCI of the current cell, if the PCI information and the PCI information are the same, a pure uplink carrier is added or deleted in the current cell, and the added or deleted pure uplink carrier is the pure uplink carrier indicated by the SUL carrier identifier; and if the two are different, newly adding a special cell, and adding the pure uplink carrier indicated by the SUL carrier identifier into the newly added special cell.
3. The method of claim 1, wherein when the radio reconfiguration message is used in a handover procedure, the configuring the uplink-only carrier indicated by the SUL carrier identity when the current cell or the newly added cell performs carrier aggregation comprises:
the UE compares the PCI information carried in the wireless reconfiguration message with the PCI in the mobility information during switching, if the PCI information and the PCI are the same, a new pure uplink carrier is added in a target cell for switching, and the new pure uplink carrier is the pure uplink carrier indicated by the SUL carrier identifier; and if the two are different, adding a special cell after the switching, and adding the pure uplink carrier indicated by the SUL carrier identifier into the added special cell.
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