LTE;. Evolved Universal Terrestrial Radio Access (E-UTRA);. Packet Data Convergence Protocol (PDCP) specification. (3GPP TS version Release. PDCP is an abbreviation for Packet Data Convergence Protocol. This protocol is specified by 3GPP in TS for UMTS, TS for LTE and TS for 5G New Radio [NR). The PDCP is located in the Radio Protocol Stack in the UMTS/LTE/5G Air 3GPP TS Packet Data Convergence Protocol (PDCP ) specification. Packet Data Convergence Protocol (PDCP) specification. (Release 8). The present document has been developed within the 3rd Generation Partnership Project.
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The method for transmitting PDCP packet, includes the steps of: The present invention relates to mobile communication, and more particularly, to a PDCP packet transmission method. Second-generation mobile communication refers to the transmission and reception of voice in a digital form, such as CDMA, GSM, and the likes.
Fourth-generation mobile communication is the fourth generation of wireless mobile communications standards. It is a successor of 2G and 3G families of standards. LTE Long Term Evolution is one of the 4th generation wireless standards designed to increase the capacity and speed of mobile telephone networks.
However, if the channel status is not good, a state epec not receiving sufficient grants from an eNB may continue, and this may cause the lge of a large amount of PDCP SDUs from the transmitting side when the Discard Timer is activated. In the case of using pdccp ciphering algorithm other than Null, if or more PDCP SDUs with sequence numbers SNs assigned thereto are discarded, the HFN value used by the transmitting side and the HFN value used by the receiving side are different from each wpec, which is an invalid deciphering result, and therefore data loss may occur at the application end.
Therefore, an object of the present invention is to improve the transmission performance of UE and eNB by suggesting a method for preventing data loss at the application end, caused by an pecp deciphering result which is generated when or more PDCP SDUs with sequence numbers assigned thereto are discarded.
To achieve these and other advantages and in accordance with the purpose of the present invention, xpec embodied and broadly described herein, there is provided a method for transmitting a PDCP packet according to soec embodiment of the present invention, the method including receiving a PDCP SDU from an upper layer; determining whether or not sequence numbers are assigned to less than a predetermined number of PDCP SDUs subsequent to the last PDCP PDU completely and successfully transmitted from a lower layer; and if sequence numbers are assigned to less spsc the predetermined number of PDCP SDUs, assigning a sequence number to the PDCP SDU received from the upper layer.
In one embodiment, the method further includes: In one embodiment, the determining step includes determining whether the difference between the sequence number assigned to the next PDCP SDU and the sequence number assigned to the last PDCP PDU completely and successfully transmitted from the lower layer is pdvp than the predetermined number or not.
In one embodiment, the predetermined number is based on the size of a reordering window. In one embodiment, the predetermined number is In one embodiment, the method further includes if sequence numbers are assigned to the predetermined number of or more PDCP SDUs, returning to the determining step.
In one embodiment, the receiving step, the determining step, and the psec step are implemented by a PDCP entity. In another embodiment, the control unit determines whether or not the difference between the sequence number assigned to the next PDCP SDU and the sequence number assigned to the last PDCP PDU completely and successfully transmitted from the lower layer is less than the predetermined number.
The features described herein can be applied to the so-called LTE Long Term Evolution technologies, which are being developed after 3G mobile communications in anticipation of rapidly increasing data traffic. The technical terms and phrases used herein are used to describe features in particular embodiments, and are not meant to limit the concepts of the present invention.
Also, if a technical term herein is not specifically defined in a different manner, such will be interpreted to have the meaning that one of ordinary skill in the art would understand, without an excessively broad or excessively narrow interpretation.
If any terms herein have been erroneously used or not completely technically accurate, then such terms may be clarified or interpreted as those skilled in the art would deem appropriate. Also, certain general terms used herein shall be interpreted according to their dictionary meaning, or interpreted in view of the context without being construed too narrowly.
Also, any words or phrases used herein in the singular may be slec to pdccp their plurality, unless clearly described to the contrary. Some elements or steps may not need to be present, or additional elements or steps may also be present. For example, without exceeding the scope of the present invention, a first element can also be explained as a second element, while a second element can also be explained as a first element.
Hereafter, with reference to the attached drawings, some embodiments will be explained, and regardless of the reference numbers in the drawings, some elements may be labeled with the same reference numbers and any repetitive explanations may have been omitted merely for the sake of brevity. Also, certain aspects of the related spef conventional art, which may be a basis for the present invention, may have not been explained but could be understood by those skilled in the art.
The sspec shown in the attached drawings are merely depicted to improve the understanding of the present invention and should not be interpreted to limit the teachings of the present invention. As such, various modifications, changes, equivalents and replacements are part of the inventive features described throughout this description. The communication network is widely deployed to provide a variety of communication services such as voice and packet data. The eNB 20 provides end points of a user plane and a control plane to the UE One eNB 20 may be deployed per cell.
An interface for transmitting user traffic or control traffic may be used between the eNBs An SAE gateway host provides a variety of functions, including termination of a plane packet and user plane switching for supporting mobility of the UE A physical layer PHYwhich is the first sspec L1provides an information transmission service to an upper layer using a physical channel. The physical layer is connected to a Medium Access Control MAC layer located at an upper level through a transport channel.
Data is transferred between the MAC layer and the physical layer via the transport channel. Data is also transferred via a physical channel between a physical layer of a transmission side and a physical layer of a reception side.
US20130170496A1 – Pdcp packet transmission method – Google Patents
Ltte RLC layer of the second layer L2 supports reliable data transmission. The header compression function allows efficient transmission of Internet protocol IP packet, such as an IPv4 or IPv6 packet through a radio interface that has a relatively narrow bandwidth. A radio resource control RRC layer located at the lowest portion of the third layer L3 is defined only in the control plane and controls logical channels, transport channels and the physical channels in relation to the configuration, reconfiguration, and release of radio bearers RBs.
The PDCP layer is terminated in the eNB 20 and may perform functions such as header compression, integrity protection, and ciphering.
As illustrated in FIG. The NAS control protocol may use three different states. In other words, the UE 10 may receive broadcasts of system information and paging information by monitoring paging signals at a specific paging occasion of every UE-specific paging DRX cycle. Furthermore, the UE 10 can report channel quality information and feedback information to the eNB. One subframe includes two consecutive slots, each of which has a length of 0.
In addition, one subframe includes a plurality of symbols e. One subframe includes a plurality of resource blocks, each of which includes a plurality of symbols and a plurality of subcarriers.
A physical channel e.
This PDCP entity consists of a transmitting side and a receiving side. The left side depicts the transmitting side having a ppdcpa header compressora security handling unitand a PDCP header attachment unitwhile the right side depicts the receiving side having a PDCP header removal unita security handling unita header decompressorand a buffer Such transmitting side and receiving side share a PDCP control unit It should be noted that the functional blocks shown in FIG.
Namely, the function of the header compressor is applied only for the U-plane data, and the integrity protection function among the functions of the security handling unit is applied only for the C-plane data.
In addition to the integrity protection function, the security handling unit also has a ciphering function that maintains data security, and such ciphering function applies to both U-plane data and C-plane spef. The size equals toi. In the steps and may be reversed in order or processed in parallel.
First of all, the user data transmission and reception process according to the conventional art will be described below. For RBs for which the Discard Timer is to set to ms50, ms, ms, ms, ms, ms, and ms, rather than to infinity, upon receipt of data from upper layers, the PDCP layer starts the Discard Timer of pdpc corresponding data. If ciphering is properly performed, no pdcl loss occurs.
Accordingly, an HFN mismatch occurs, and this results in an invalid deciphering result, thus causing data loss at the application end and making lost data permanently unrestorable. In this case, data loss occurs at the application end. Accordingly, this does not have a direct effect on data transmission and reception. Accordingly, data loss spfc. Accordingly, LastSucceededSN is set to Because the step of FIG.
The method of the present invention explained thus far can be implemented in software, hardware, or a combination thereof. For example, the method of the present invention can be implemented as codes or commands of a software program that can be executed by a processor, and can be saved in a storage medium e. The method of the present invention may be implemented in a mobile terminal or network entity.
The mobile terminal or network entity may include the protocols of FIGS. According to the present invention, sprc the Discard Timer is not set to infinity, if no radio link failure occurs, and the low signal environment continues, it is possible to prevent the discarding of or more PDCP SDUs with sequence numbers already assigned thereto by limiting the maximum number of transmission data.
While this invention pdccp been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements ppdcp within the spirit and scope of the appended claims.
A method for transmitting PDCP packet, the method comprising: The method of claim 1wherein the determining step includes determining whether the difference between the sequence number assigned to the next PDCP SDU and the sequence number assigned to the last PDCP PDU completely and successfully transmitted from the lower layer is less than the predetermined number or not.
The method of claim 1wherein the predetermined number is based on prcp size of a reordering window. The method of claim 1wherein the predetermined number is The method of claim 1further apec if sequence numbers are assigned to the predetermined number of or more PDCP SDUs, returning to pccp determining step. The method of claim 1wherein the receiving step, the determining step, and the assigning step are implemented by a PDCP entity.
Method for reordering a packet data convergence protocol packet data unit at a lts equipment in a dual connectivity system and device therefor.
USB2 – PDCP packet transmission method – Google Patents
Method for processing received pdcp pdus for d2d communication system and device therefor. Method for processing a packet data convergence protocol service data unit at a user equipment in a dual connectivity system and device therefor. Method and apparatus for transmitting and receiving data using a plurality of carriers in mobile communication system.
Determination of acceptable sequence number ranges in a communications protocol. Method and apparatus for handling out-of-order packets during handover in a wireless communication system. Wireless communication method for transmitting a sequence of data units between a wireless device and a network. Method and apparatus for supporting configuration and control of the rlc and pdcp sub-layers. System and method for multi-point hsdpa communication utilizing a multi-link pdcp sublayer.
Method and apparatus for performing handover using packet data convergence protocol pdcp reordering in mobile communication system. Method and terminal for performing handover in mobile communications system of point-to-multipoint service. Effective reception method in wireless communication system providing MBMS service.
System and method for reducing resets during handovers in a single frequency dual carrier wireless communication system. Mobile communication system and method for processing handover procedure thereof.