Zulkirr 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. Even spev not shown in this diagram, we can disable Header Compression even for U-plane data e. 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. Compact zxsdr b l adopts standard microtca platform. Hi Sakthibalan, Since it is linking two different technologies, I think it is called convergence protocol. The method of claim 1wherein the predetermined number is based on the size of a reordering window.
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Malar I can see that youre trying to build netanim with qt5, which will give you troubles, although you do not really need netanim. I always wondered how and when PDCP generates the status reports. What could be maximum Discard timeout value? I have a feeling control plane does not delete each one of them. Following two data structure is a kind of PDCP layer control packet. 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.
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.
Also, certain general terms used herein shall be interpreted according to their dictionary meaning, or interpreted in view of the context spe being construed too narrowly. So, it is required to have terminate bearer function for all bearers belonging to UE. The method of claim 1wherein the predetermined sppec is based on a size of a reordering window.
In one embodiment, the receiving step, the determining step, and the assigning step are implemented by a PDCP entity.
CID information in a feedback element indicates the context for which feedback is sent. MAC-I is the special information for Integrity protection. A base station punctures OFDM reference symbols to provide fast physical-layer signaling of periods during which a terminal may enter a low power mode. If PDCP layer receives duplicate packets packets with same sequence numberthe it discards them and does not send them to upper layers.
Method and apparatus for supporting configuration and control of the rlc and pdcp sub-layers. Openssl on qoriq communications platform and c29x crypto. The communication network is widely deployed to provide a variety of communication services such as voice and packet data. Lte pdcp spec pdf files However, if the channel status is not good, a state of not receiving sufficient grants from an eNB may continue, and this may cause the discarding of a large amount of PDCP SDUs from the transmitting side when the Discard Timer is activated.
Most of the lte pdcp pdu you woud see would be the data pdu. It helps control plane to corelate its context easily. In one embodiment, the method further includes: This function is called when the PDCP layer is informed of handover for a given context.
They are given to the upper layers immediately after Security and RoHC processing. For data traffic, ROHC is not mandatory, but it is good to have. 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 Pdcpp, if the channel status is not good, a state of not receiving sufficient grants from an eNB may continue, and this may cause the discarding of a large amount of PDCP SDUs from the transmitting side when the Discard Timer is activated. As such, various modifications, changes, equivalents and replacements are part of the inventive features described throughout this description.
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LTE PDCP SPEC PDF
Arashijinn PDCP upon receiving the packets from RLC layer is expected to send the status report to the peer with bitmap of packet sequence numbers so that the peer PDCP can remove the SDUs at its transmit side that were acknowledged in the status message. Most significant bits are called HFN. User Datagram Protocol, Src Port: In the case of using an 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 other, which is an invalid deciphering result, and therefore data loss may occur at the application end. What are we supposed to do? Determination of acceptable sequence number ranges in a communications protocol. 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. Lte pdcp spec pdf files Following is the decoded IP Packet for your reference: Since these two events happen at different times, it is required that PDCP does not start processing the packets until PDCP sequence numbers are known to it.
LTE Protocol Stack Layers
It is present in UE and eNodeB. This protocol sends and receives packets to and from UE and eNodeB over air interface. PDCP is user plane protocol. Sequence number is used to detect anti replays. ROHC is mandatory for voice traffic. Note that in LTE, both voice and data use packet switching.
LTE Protocols & Specifications
Goltikasa So, lye is required to have terminate bearer function for all bearers belonging to UE. Also, any words or phrases used herein in the singular may be interpreted to cover their plurality, unless clearly described to the contrary. Determination of acceptable sequence number ranges in a communications protocol. Similarly, uplink packets which are received out-of-order also sent to the dpec eNB.
Packet Data Convergence Protocol (PDCP)
Kajisar While this invention has 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 included within the spirit and scope of the appended claims. Tle will not go into those details here as the specification is very clear on them. At times when channel condition is not good but not so bad to trigger HO it may so happen that acks can be delayed and 2K limit reaches much faster due to higher rate. PDCP is a layer sitting at the top most part of the radio stack. Huawei confidential page 6 overview of 3gpp sa3 12 3gpp ran radio access network ran wg1 radio layer 1 spec ran wg4. The article pdc; a good help in understanding PDCP. 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 invalid deciphering result which is generated when or more PDCP SDUs with sequence numbers assigned thereto are discarded.