CN103582013B - The downlink transmission method of PDCP data - Google Patents

Abstract

This application discloses a method for downlink transmission of Packet Data Convergence Protocol (PDCP) data. The method establishes data labels for PDCP data, and performs corresponding RLC protocol and MAC protocol processing operations according to the data labels, which can effectively reduce data transmission during transmission. The number of storage and reading times can reduce the overhead of system processing resources and improve the processing efficiency of data transmission.

Description

Downlink Transmission Method of Packet Data Convergence Protocol Data

technical field

The present invention relates to wireless communication technology, in particular to a downlink transmission method of Packet Data Convergence Protocol (PDCP) data.

Background technique

In the current wireless communication system, PDCP data needs to be processed by the protocol layer below the PDCP layer (that is, the Mac layer and the RLC layer) and then sent to the physical layer, and then sent out through the physical layer. In the process of processing PDCP data at the Medium Access Control (Mac) layer and the Radio Link Control (RLC) layer, it is necessary to establish a data header of the corresponding protocol layer for the PDCP data layer by layer according to the order of service flow and The established data header is bound with the PDCP data and stored in the service cache of each protocol layer.

In this way, during the transmission of PDCP data from the PDCP layer to the physical layer, it is necessary to perform operations such as copying, moving, and grouping of service data layer by layer, and a data flow four times that of the service traffic will be formed in the protocol stack to be copied and circulated. Obviously, this kind of operation that requires multiple data copies and grouping will consume more system processing resources and increase the processing delay of data transmission, thereby limiting the further improvement of system processing capabilities.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for downlink transmission of PDCP data, which can improve the efficiency of data transmission.

In order to achieve the above object, the technical scheme proposed by the present invention is:

A method for downlink transmission of packet data convergence protocol data, comprising:

In each scheduling period, when the radio link control RLC layer receives the packet data convergence protocol PDCP downlink data, save the PDCP downlink data into the storage area;

When downlink scheduling occurs, the media access control Mac layer creates a corresponding data label or updates the data label for the data that needs to be transmitted for the current downlink scheduling according to the size of the air interface resource authorized by this scheduling. Data storage location information and related parameters used for protocol processing by the RLC layer and the media access control Mac layer;

The Mac layer triggers the RLC layer to generate an RLC protocol header for the corresponding data according to the data label, saves the RLC protocol header in the data label, and sends it to the Mac layer;

After the Mac layer receives the data tag, it generates a Mac protocol header for the corresponding data according to the data tag, stores the Mac protocol header in the data tag, and triggers the generation of the Mac protocol header based on the data tag. transmit the service data to the physical layer, and send the service data to the physical layer.

In summary, the downlink transmission method of PDCP data proposed by the present invention can effectively reduce the number of data storage and reading times during transmission by establishing data labels for PDCP data and performing corresponding protocol processing operations according to the data labels, and further can Reduce the overhead of system processing resources and improve the processing efficiency of data transmission.

Description of drawings

FIG. 1 is a schematic flow chart of Embodiment 1 of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The core idea of the present invention is: considering that the protocol processing of the Mac layer and the RLC layer to data is to establish a corresponding protocol header for the data and then combine the protocol header with the data for storage, because these processes are not direct operations on the data, Therefore, in the air interface data scheduling process, a data label can be established for it first, and the physical storage location of PDCP data and related parameters used for protocol processing by the RLC layer and the Mac layer will be recorded in the data label. In this way, in the process of processing PDCP data by the Mac layer and the RLC layer, only the label that needs to transmit data is operated, and the protocol processing operation of the Mac layer and the RLC layer on the PDCP data can be completed, that is, the PDCP data is established according to the data label. The protocol header of each protocol layer and temporarily store the established protocol header in the label, and finally read the corresponding business data according to the physical storage location information in the data label and assemble the data header of each layer with the corresponding business data , to get data that can be sent at the physical layer. In the above process, only one time of data storage and reading is required, therefore, the overhead of system processing resources can be reduced, and the processing efficiency of data transmission can be improved.

Fig. 1 is a schematic flow chart of Embodiment 1 of the present invention, as shown in Fig. 1, the method includes:

Step 101. In each scheduling period, when the RLC layer receives PDCP downlink data, save the PDCP downlink data into a storage area.

Step 102. When downlink scheduling occurs, the Mac layer creates a corresponding data label or updates the data label for the data that needs to be transmitted for the current downlink scheduling according to the size of the air interface resource authorized for this scheduling, and the data label contains information for indicating Data storage location information and related parameters used for protocol processing by the RLC layer and the Mac layer.

Here, the difference from the existing system is that: with this step, when there is scheduling authorization, it is necessary to first establish or update the corresponding data label for the data to be transmitted, and the data label will contain the storage location information and Relevant parameters for protocol processing by the RLC layer and the Mac layer, so that the RLC and Mac layers can perform corresponding protocol processing based on the data label, without performing related protocol processing based on actual data.

Here, the relevant parameters used for protocol processing by the RLC layer and the Mac layer are known to those skilled in the art, and will not be repeated here.

The establishment of a corresponding data label or updating of the data label for the data that needs to be transmitted for the current downlink scheduling includes:

When downlink scheduling occurs, if the data to be transmitted in the current downlink scheduling is hybrid automatic repeat request (HARQ) newly transmitted data, then according to the size of the air interface resource authorized for this scheduling, a data label is established for the newly transmitted data scheduled this time; If the data to be transmitted in the current downlink scheduling is HARQ retransmission data, the data label of the retransmission data in the current scheduling is updated according to the size of the air interface resource authorized for the current scheduling.

Here, the HARQ newly transmitted data is the data transmitted for the first time. For the HARQ newly transmitted data, as in the existing system, it is necessary to determine the currently scheduled newly transmitted data from the data to be transmitted according to the size of the air interface resources authorized for this scheduling. The specific determination method is within the grasp of those skilled in the art and will not be repeated here.

In this step, for the HARQ retransmission data, since the corresponding data label has been established for the data when the data is transmitted for the first time, it is only necessary to update the corresponding data label so that the data label is consistent with the corresponding data. . According to whether the authorized air interface resources can meet the complete transmission of retransmission data, the specific implementation of the update will be divided into two types, one is the reorganization of the data label, and the other is the split of the data label. The former is in this scheduling The authorized air interface resources can meet the current complete transmission of retransmission data. At this time, only the old data label needs to be modified. The latter is because the air interface resources authorized for this scheduling cannot meet the current needs. It is carried out under the condition of complete transmission of retransmitted data. At this time, only part of the data can be transmitted. Therefore, the data to be retransmitted will be divided into two parts, one part is currently scheduled for transmission, and the other part cannot be transmitted by the current schedule. Therefore, one part On the one hand, it is necessary to establish a data label for the data currently scheduled for transmission; on the other hand, it is necessary to modify the existing data label for the data that has not been retransmitted. The specific methods of the two updates include:

If the air interface resources authorized by this scheduling can meet the complete transmission of the current data that needs to be retransmitted, then modify the data label of the data that needs to be retransmitted, so that the modified data label only contains information related to the data that needs to be retransmitted. Information;

If the air interface resources authorized for this scheduling cannot meet the complete transmission of the current data that needs to be retransmitted, then according to the air interface resources authorized for this scheduling, determine the data that can be retransmitted in this scheduling from the current data that needs to be retransmitted. The determined data establishes the data label, and for the retransmission data that has not been transmitted in this schedule, modify the corresponding data label so that the modified data label only includes the retransmission data that has not been transmitted Related information.

Step 103, the Mac layer triggers the RLC layer to generate an RLC protocol header for corresponding data according to the data label, saves the RLC protocol header in the data label, and sends it to the Mac layer.

In this step, the specific method for generating the RLC protocol header is the same as that of the existing system, and will not be repeated here.

Step 104, after the Mac layer receives the data tag, generate a Mac protocol header for the corresponding data according to the data tag, store the Mac protocol header in the data tag, and trigger The tag generates traffic data that can be transmitted to the physical layer, and sends the traffic data to the physical layer.

In this step, the specific generation method of the Mac protocol header is the same as that of the existing system, and will not be repeated here

Here, the specific method for generating service data that can be transmitted to the physical layer according to the data label includes:

Obtain corresponding data from the storage area according to the data label, and combine the acquired data with the RLC protocol header and the Mac protocol header stored in the data label to obtain the service data.

Here, the specific combination format of the data and the header is the same as that of the existing system, and will not be repeated here.

In practical applications, in order to improve the utilization rate of data tag resources, when receiving the feedback that the data is successfully received, the data tag corresponding to the successfully received data may be marked as a releasable tag. In this way, one or a combination of the following methods can be used to realize the timely release of the data tag, so as to save the overhead of system resources.

Way 1. After the generation of the service data that can be transmitted to the physical layer is completed, the data tag resource currently identified as a releasable tag is released.

Method 2: According to the preset label release period, the data label resources currently marked as releasable labels are released.

It can be seen from the above scheme that in the process of receiving PDCP data and converting it into data that can be transmitted at the physical layer, the present invention only stores and reads the data to be transmitted once, which effectively reduces the number of data reads. Write operation, which can improve the processing efficiency of data in the transmission process. In addition, the structure of the protocol stack after sharing the data management function is simplified, which improves the reliability of the system.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. a downlink transmission method for PDCP data, is characterized in that, comprising:

In each dispatching cycle, when Radio Link control rlc layer receives line number under PDCP PDCPAccording to time, described PDCP downlink data is saved in memory block;

When occurring when descending scheduling, medium access control Mac layer is according to the interface-free resources size of this scheduling authorization, forThe data that current descending scheduling need to transmit, set up corresponding data label or carry out the renewal of data label, described numberComprise and be used to indicate the stored position information of data and carry out for rlc layer and medium access control Mac layer according to labelThe relevant parameter of protocol processes;

Described Mac layer triggers described rlc layer according to described data label, for corresponding data generate rlc protocol reportHead, after described rlc protocol header is kept in described data label, sends to described Mac layer;

Described Mac layer receives after described data label, according to described data label, for corresponding data generate MacProtocol header, deposits described Mac protocol header in described data label in, and triggers according to described data label generationCan be transferred to the business datum of physical layer, and described business datum is sent to physical layer.

2. method according to claim 1, is characterized in that, the described number that need to transmit for current descending schedulingAccording to, the renewal of setting up corresponding data label or carrying out data label comprises:

In the time there is descending scheduling, if the data that current descending scheduling need to transmit are mixed automatic retransfer requestsHARQ new biography data, according to the interface-free resources size of this scheduling authorization, for the new biography data of this scheduling are set upData label; If the data that current descending scheduling need to transmit are HARQ data retransmissions, award according to this schedulingThe interface-free resources size of power, the data label of the data retransmission to this scheduling upgrades.

3. method according to claim 2, is characterized in that, described renewal comprises:

If the interface-free resources of this scheduling authorization can meet the complete transmission of current needs data retransmission, to describedNeed the data label of data retransmission to modify, make only to comprise with described and need to retransmit number in amended data labelAccording to relevant information;

If the interface-free resources of this scheduling authorization can not meet the complete transmission of current needs data retransmission, according to thisThe interface-free resources of inferior scheduling authorization, needs from current the data that data retransmission, definite this scheduling can retransmit, and isDetermined data are set up described data label, the described data retransmission not being transmitted for this scheduling, and amendment is correspondingData label, make only to comprise in amended data label the letter relevant to the described described data retransmission not being transmittedBreath.

4. method according to claim 1, is characterized in that, generates and can be transferred to according to described data labelThe business datum of physical layer comprises:

According to described data label, obtain corresponding data from described memory block, and by obtained data and described numberCombine according to the rlc protocol header of preserving in label and Mac protocol header, obtain described business datum.

5. method according to claim 1, is characterized in that, described method further comprises:

In the time receiving the feedback that data successfully receive, data label corresponding to data that described success is received is designated canDischarge label.

6. method according to claim 5, is characterized in that, described method further comprises:

After complete described generation and can be transferred to the business datum of physical layer, current being designated can be discharged to labelData label resource discharges.

7. method according to claim 5, is characterized in that, described method further comprises:

According to default label deenergized period, the current data label resource that can discharge label that is designated is discharged.