The cell edge user throughput is defined as the 5% point of the cumulative density function. Packet transmission an overview sciencedirect topics. Phich carries 2 harq ack nack which is identified by iphich 0 and 1 to indicate ack nack for 2 ul subframes. This multiplexing happens in the way described as follows 38.
Cse283exam2studyguide study guide cse 283 terms ack. But in tdd, ue cannot transmit the response in such a fixed timing as in fdd. Communication is possible over the air radio frequency, using a physical media. This example shows how to measure the false detection probability and missed detection probability of hybrid automatic repeat request ack harq ack multiplexed on the physical uplink shared channel pusch using the lte toolbox under conformance test conditions as. A conceptual diagram of scmimo spatial multiplexing and harq packet combining with joint txrx mmsefd filtering is illustrated in fig. Transport layer computer networks lecture 16 transport. In some digital communication protocol s, ack is the name of a signal that data has been received successfully for example, with an acceptable number of errors. Up to 10 acknack bits for fdd up to 20 acknack bits for tdd not based on zadoffchu sequences, uses. In n pucch 3,1, the mapping of harq ack states to qpsk constellation points is. Tcps three way handshaking technique is often referred to as synsyn ack or more accurately syn, syn ack. Multiplexing techniques frequencydivision multiplexing fdm each channel occupies a fraction of the bandwidth of the link a channel is defined by its center frequency, and its bandwidth.
Ack or nak wait for call from sender below receiver. A method, apparatus and computer program which enable simultaneous transmission of a positive or negative acknowledge and channel state information and spatially bundle the positive or negative acknowledge bits corresponding to multiple transport blocks for each of a plurality of component carriers, where if there are two positive or negative acknowledge bits on a carrier component a logical. Lteadvanced design and test challenges carrier aggregation. For both case 1 and case 2, harq ack multiplexing is needed to report harq ack of multiple slots or minslots into one pucch or pusch within a pucch group. We assume that the feedback delay per time slot amount to half a timeslot. Multiplexing periodic csi with harqack on pucch format 3.
In order to avoid dropping the periodic csi report frequently in case of collision between a periodic csi report and harq ack feedback in lteadvanced system, this paper gives two coding schemes for multiplexing periodic csi channel state information with harq ack hybrid automatic repeat request acknowledgement feedback on pucch physical up control channel format 3. An example of harq ack multiplexing of multiple dl transmissions according to case 2 is described in connection with fig. Ue requests retransmission of incorrectly received data packets ack nack is transmitted in ul, either on pucch or mux with pusch ack nack transmission refers to the data packet received four subframes 4 ms before. Us20120207109a1 multiplexing of acknack and channel state. The tcp threeway handshake in transmission control protocol also called the tcphandshake. A technique called ack nack bundling has been used for the overhead reduction of the ack nack signaling. Multiplexing bundling see 3gpp ts technical specification 36. In harq, the receiver needs to feedback an acknack on its data to inform the transmitter whether to retransmit or terminate the current packet transmission. This is one of the complicated topics at least to me in 5gnr physical layer process 38. May 16, 2017 optical timedivision multiplexing otdm has been considered as an alternative to wavelengthdivision multiplexing for future networks operating in excess of 10 gbs. Acoe312 multiplexing 2 3 key points to make efficient use of highspeed communication lines, some form of multiplexing is used. Wavelength division multiplexing wdm is a technology in fiber optic communications. Multiplexing references frequencydivision multiplexing and. This option is referred to as ack nack multiplexing.
Ack nack for data packets transmitted in the downlink. Lte rpess initial parameter planning 3 nokia siemens networks ra4120cen20gla0 module objectives after completing this module, the participant should be able to. Frequency division multiplexing fdm time division multiplexing tdm. Transmission time interval an overview sciencedirect topics. Us20110205981a1 multiplexing uplink l1l2 control and. The ack nack transmission in fdd mode refers to the downlink packet that was received four subframes earlier. Before the receiver can send an ack, the transmitter must release the sda line.
Multiplexing is provided by the physical layer of the osi model, while multiple access also involves a media access control protocol, which is part of the data link layer. Nack initial transmission 1st retransmission txmmsefd filtering mimo channel figure 2. Rfc 4588 rtp retransmission payload format july 2006 consecutive rtcp compounds. Bundling harq feedback in a time division duplexing. Ack nack signal structure in eutra downlink agenda item. The acknowledgement code is an ascii character that has been designated to serve as a signal between sender and recipient. For fdd, spatial bundling of harq ack nack bits may be used in particular to reserve room for csi feedback if necessary in some cases. Harq ack nack bundling as described may be used in particular for the tdd case. The other is termed multi ack nack also known as ack nack multiplexing, in which each dl subframe is considered as a separate harq process. Negative ack when the receiver receives a damaged frame or a duplicate frame, it sends a nack back to the sender and the sender must retransmit the correct frame. Data and control multiplexing in pusch in wireless.
Ee4512 analog and digital communications chapter 7 chapter 7 multiplexing techniques time division multiplexing pages 364368. Pdf multiplexing periodic csi with harqack on pucch. Such a feedback mechanism introduces a delay compared with the. Scheduling request, acknack, csi feedback one pucch transmitted within one resource block frequencyhopping at slot border diversity codemultiplexing of multiple ues in one rb pair orthogonal within a cell nonorthogonal between cells 1 ms subframe u p l i n k s y s t e m b a n d w i d t h 1 2 s u b c a r ie r s. Tdd acknack feedback mode determines which harq ack nack feedback mode is used. Multiplexing, demultiplexing, asynchronous, synchronous, tdm. The ack nack onebit message is the only feedback allowed in this model and the arq feedback channel is assumed to be errorfree and of negligible delay. Overview of lte radio interface and radio network architecture for high speed, high capacity and low latency. Multiplexing allows several transmission sources to share a larger transmission capacity. Sequence numbers and request numbers can be sent modulo 2. Positive ack when the receiver receives a correct frame, it should acknowledge it. A diversitymultiplexingdelay tradeoff of arq protocols in. For example, when harq is received on subframe 1, it refers 143, which refers subframe 7 in.
Ack nck multiplexingevery harq process 2 streams make and operator single stream without this operation tdd switchcfg 2. Ee4512 analog and digital communications chapter 7 the t1 tdm system for telephone networks uses a 193 bit frame where each frame has 24 8bit slots and 1bit in each frame for signaling. A diversitymultiplexingdelay tradeoff of arq protocols. Cqi ack nack n transport blocks dynamic size for n users. The multiplexed data may be acquired by multiplexing the transmission block for the ulsch and the channel status information. Know about different types of multiplexing techniques for. An acknowledgment code is also known as an acknowledgment character. When iphich0, the received harq ack nack corresponds to the ul subframe ik from the following table.
According to rel11, the periodic csi report is 11 bits at most. Scheduling request, ack nack, csi feedback one pucch transmitted within one resource block frequencyhopping at slot border diversity code multiplexing of multiple ues in one rb pair orthogonal within a cell nonorthogonal between cells 1 ms subframe u p l i n k s y s t e m b a n d w i d t h 1 2 s u b c a r ie r s. Then it uses a corresponding cce to confirm for the nack dtx that has as the possible harq ack state in the qpsk constellation. This system uses multiplexer at transmitter to join signals and demultiplexer to split the signals apart, at the receiver end. For tdd harq ack multiplexing and a subframe n with m 1, spatial. If there is up to 10 harq ack bits plus 1 sr bit, the pucch format 3 can in principle be used for multiplexing harq ack bits with any of the pucch periodic csi reporting modes. Joint txrx filtering for singlecarrier mimo spatial.
For tdd, the use of a single ack nack response for multiple pdsch transmissions is possible. Introduction the attachment of the ue id to the ack nack bits is inefficient because the ack nack signal has only one bit per ue. Link level investigation of acknack bundling for lte tdd. The sender maintains a clock and sets a timeout period. Tcp 3way handshake syn,synack,ack inetdaemons it tutorials. If no slave devices recognize the address, the result is a nack. T27 the difference between a swift ack and swift nack. Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link. This tells the master that the slave it is trying to reach is actually on the bus. Carries dl harq ack nack phich group 1 phich group 8 phichs normal cp use length 4 orthogonal sequence 1 phich group 4 phichs extend cp use length 2 orthogonal sequence typically transmitted on the 1st ofdm symbol but also can be 3 ofdm symbols durarion. Multiplexing is a technique by which different analog and digital streams of transmission can be simultaneously processed over a shared link.
To send an ack bit, the receiver shall pull down the sda line during the low phase of the ack nack related clock period period 9, so that the sda line is stable low during the high phase of the ack nack related clock period. Transmission, coding and multiplexing methods of multiple downlink ack nack signals 3. Us20110205981a1 us12854,260 us85426010a us2011205981a1 us 20110205981 a1 us20110205981 a1 us 20110205981a1 us 85426010 a us85426010 a us 85426010a us 2011205981 a1 us2011205981 a1 us 2011205981a1 authority us united states prior art keywords scheduling request nack harq ack reference signal wtru prior art date 200908 legal status the legal status is. For tdd harq ack multiplexing and a subframe n with m 1, spatial harq ack bundling across multiple codewords within a dl subframe is not performed, 1 or 2 harq ack bits are transmitted using pucch format 1a or pucch format 1b, respectively for one configured serving cell. One is termed ack nack bundling, in which ack nack feedback related to multiple dl subframes is compressed into a single ack nack feedback transmitted via a single ack nack resource. A duplexing technique dividing a radio channel in time to allow downlink operation during part of the frame period and uplink operation in the remainder of the frame period. Whenever the transmission capacity of a medium linking two devices is greater than the transmission needs of the devices, the link can be shared in order to maximize the utilization of the link, such as one cable can carry a hundred channels of tv. The very first two octets transmitted by a station is the frame control. Transmission scheme our view is that distributed transmission should be applied to the downlink ack nack signal in. A problem in ack nack multiplexing is that the number of feedback bits can become large, especially in the case of uldl configuration 5 up to 20 bits. Multiplexing control and data in the pusch slotlevel ul ack nack cyclic shiftorthogonal cover remapping ul ack nack resource indication for dl persistent scheduling robust re mapping of control and data on pusch sams sams sams sams ri 080675 ri 080676 ri 080677 ri080678. Ascii code includes an ack character 0000110 2 or 6 16 which can be transmitted to indicate successful receipt and a nak character 0010101 2 or 15 16 which can be transmitted to indicate or inability or failure to receive. Us20120207109a1 multiplexing of acknack and channel.
An acknowledgment code ack is a type of unique signal that a computer sends to show that data has been transmitted successfully. It then includes a tag indicating the reject reason 405. Ue start preparing the response as soon as it completes the decoding pdsch and transmit it 4 ms 4 tti later. Harq acknack bundling in downlink carrier aggregation. The input argument, in, is a vector or cell array containing up to 20 harq ack information bits. Ack nack from ue on pucch or pusch next harq process n ack nack from ue on pucch or pusch next harq process n each dl harq process may have variable timing the enb can transmit as soon as it receives the ack nack from the ue, depending on rb availability variable interval variable fixed 4 subframe interval interval. Therefore, this paper proposes a basic structure for the downlink ack nack. So each phich after spreading with a 4 bits orthgonal sequence becomes 12 bits. Tcp segment structure reliable data transfer flow control connection management 4.
Up to 10 ack nack bits for fdd up to 20 ack nack bits for tdd not based on zadoffchu sequences, uses. How to verify your lte protocol and rf interactions. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a specific network drive within etsi secretariat. Study guide cse 283 terms ack aimd as autonomous system bgp congestion window demultiplexing dhcp dual stack estimated rtt forwarding table gateway router icmp interas routing protocol interface intraas routing protocol ip ip address ipv4 ipv6 mss mtu multiplexing nak nat port number receive window rip rtt sample rtt tcp timeout event ttl tunneling udp vc. Instead of sending ack or nak, the receiver sends the number of the packet currently awaited.
Chapter 3 transport layer university of washington. Ack nak corrupted twice as many states state must remember whether current pkt has 0 or 1 seq. Nevertheless, this feedbackbased link adaptation approach may increase the communication delay due to the need of additional transmission time intervals while waiting for the ack nack message. Wo2012110493a1 multiplexing of acknack and channel state. If ue receives the dci form in the 2nd dl subframe 902. Multiplexing divides the high capacity medium into low capacity logical medium which is then shared by different streams. Ack nak received ok at sender transport layer 319 rdt2.
Cn102577215a transmission diversity and multiplexing for. Wo2012110493a1 multiplexing of acknack and channel. Carries dl harq acknack phich group 1 phich group 8 phichs normal cp use length 4 orthogonal sequence 1 phich group 4 phichs extend cp use length 2 orthogonal sequence typically transmitted on the 1st ofdm symbol but also can be 3 ofdm symbols durarion. This works correctly assuming that 1 frames travel in order fcfs on links 2 the crc never fails to detect errors 3 the system is correctly initialized.
One option for harq ack signalling is to simply feedback separate harq ack for each pdsch transport block for all subframes. Harq ack nack feedback for 32 dlccs is discussed in the following. This transmition of uci and pusch at the same time is called multiplexing and the ucipusch multiplexing is supported. In tdd mode, the uplink ack nack timing depends on the uplinkdownlink configuration. In case of fdd, it is pretty simple and obvious for ue to transmit harq ack or nack. Along with the overhead reduction, the downlink performance is also degraded.
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