Attempting to decode the data deciding whether to send ack or nack soft combining of retransmitted data the nodeb harq process is responsible for. Us9723618b2 thresholdbased and powerefficient scheduling. Next, the packet data unit is provided to the harq process to be used in the next transmission time interval for transmission on the uplink channel in the next transmission time interval. Another focus is on the protocol enhancements like machs or on the frame protocols on iubiur interface. The node b can request retransmissions of erroneously received data packets and will send for each packet either an acknowledgement ack or a negative acknowledgement nack to the ue. Hspa also boosts capacity in umts networks and provides significant latency reductions. While some are common to the companion hsupa technologies added to the uplink, others are specific to hsdpa high speed downlink packet access, because the requirements for the each direction differ. Since its introduction, thirdgeneration 3g cellular technology has been heralded for its ability to deliver more voice channels and higherbandwidth. This means that the system knows which harq process is used without need for including such information in the data stream. The transmissionof new packets during this time period is prevented. Enhanced tdd ul harq timeline for uldl coexistence scenario. View notes hspa from fms bbaitm at islamic university. Transport and physical channels introduced hsupa provides in the ul what hsdpa has in the dl.
Each time the ue transmits, the receiving harq process in the. It is not required to inform nodeb that which harq process. Thus hsupa opens further areas for innovations and new business possibilities. Highspeed uplink packet access hsupa is a 3g mobile telephony protocol in the hspa family. Hsdpa and hsupa both offer high voice and data performance and together will enable the success of massmarket mobile ip multimedia.
November 9, 2010 this section is only applicable to the lab application. It outputs modulation signals by selecting generated waveform patterns. The hsupa uplink transmitter and receiver structure block diagram for e. It can provide significant throughput, latency, and capacity gains on the downlink and. In an example, harq process id may be started with 0 e.
The course focuses on the necessary extensions of the utran architecture in nodeb and ue which are required for hsdpa. Umts hspa datatransmission performance improvement high. Hsupa, it can be the driver for advance services like voip. Basically network can transmit the data anytime it is ready. Concepts of hsdpa agilent high speed packet access. Thus, the utran either the node b or a more supervisory element, such as the rnc for the node b in effect flushes the ue harq processes whenever the. After the drivers are installed, the device is recognized and the computer will let you know that the device is ready for use. Hsupa abbreviation stands for high speed uplink packet access.
What is the abbreviation for high speed uplink packet access. Both incremental redundancy and chase combining are supported. Harq is used in hsdpa and hsupa which provide high speed data transmission on downlink and uplink. High speed uplink packet access hsupa is a release 6 feature in 3gpp specifications and is part of hspa high speed packet access family. May, 2017 before answering your question i will give some brief overview of harq in lte. Hsupa together with hsdpa are sometimes referred to as hspa. When one harq process is waiting for an acknowledgement, another process can. Tm freescale and the freescale logo aretrademarksof freescale semiconductor, inc.
The number of harq retransmissions targeted by the harq protocol depends on the network configuration. Following in the footsteps of gsm, gprs, and umts, now hsdpa high. High speed uplink packet access driver force for hsupa. Mar 16, 20 driver to hsdpa hsdpa, mature technology2002. To improve the uplink data rate some new functionality are added. Here sender stops and waits for ack or nack from receiver before transmitting next block or same block of data. This means that enodeb knows exactly which rv redundant version and harq process the ue will transmit. Too many options there are many options available to basestation designers and operators when dealing with hsdpa. Harq is used in hsdpa and hsupa which provide high speed data transmission on downlink and uplink, respectively for mobile phone networks such as umts, and in the ieee 802. Hsupa high speed uplink packet access, or fdd enhanced uplink, is designed to improve the performance of uplink dedicated transport channels. Oct 03, 2009 high speed uplink packet access hsupa is introduced in 3gpp release 6 standards to improve the uplink ue data rate which was significantly low up to release 5. Harq process each hsdpa assignment is handled by a harq process runing in nodeb and ue the ue harq process is responsible for. The flag indicates to the ue whether the ue is to perform hsupa harq process flushing prior to the reconfiguration.
A little bit different mode of harq process is used depending on whether it is for fdd or tdd and whether it is for uplink and downlink. In uplink, harq adopts the n channel stop and wait nsaw protocol. The software runs under the windows os installed in the mg3710a, ms2690a91a92a020, and ms2830a020021. Fdpch in dl scheduling dpch in ul harq tx link adaptation hs hs dsch hs sc dp ch nodeb nodeb cc h nonserving cell serving cell ue in sho for associated dch hsupa mace. When ue is in soft handover, harq is terminated in multiple cells. Harq process number scheduling decision load estimation, etc x ag applied to this harq process x rg interpreted relative to the previous tti in this harq process. However, pending retransmissionsare allowed to occur. The uplink information dispatching method comprises the following step. Hybrid automatic repeat request harq the harq protocol is a retransmission protocol improving robustness against link adaptation errors. Harq is a key element of the new mac entity denoted as machs, which is located both in the nodeb and in the user equipment ue. Each harq process number is closely associated with the new data indicator and redundancy version field. Hsupa means moving further control functions from the rnc to the node b. It is not required to inform nodeb that which harq process is used at any point of time.
Higher bitrates and lower delays were strong driving forces for the. It is also used in evolutiondata optimized and lte wireless networks. In an example, harq process id may continue to sequentially increase using the above equation after a new sps is activated or an existing sps is released. In hsdpa case, data source is nodeb and destination is ue. High speed uplink packet access hsupa is introduced in 3gpp release 6 standards to improve the uplink ue data rate which was significantly low up to release 5. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Medium access control mac protocol specification 3gpp ts 25.
Whenever an hsdsch block is transmitted to a ue, the ues l1 will attempt to decode it and will pass the result to a hybrid arq harq process that is running in the machs layer. In wcdma, hsdpa, hsupa probably yes, but in lte you would still have a little low throughput than the 3gpp spec value even in phy throughput. There is one harq entity per ue with 8 stopandwait processes for each harq entity. Version e003 4 machs tasks ue side machs reordering queue distribution harq mac control hsdsch associated ul signaling associated dl signaling to macd machs functional entities ue. This technology was the second major step in the umts evolution process. Both ir and cc strategies are supported in hsupa and the only main difference is that hsupa harq procedure is synchronous. Harq process restriction and transmission of nonscheduled. Hsupa high speed uplink packet access is essentially the equivalent of. If many non hsupa scheduling users exist in the cell, the available load of the hsupa scheduling user is affected, therefore affecting the actual rate of the hsupa scheduling users. Hsdpa high speed downlink packet access and hsupa high speed uplink packet access offer breakthrough data speeds, theoretically up to 14. Enhanced uplink dedicated channel edch high speed uplink.
Hspa refers to hsdpa and hsupa which are introduced in 3gpp release 5 and release 6. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Figure 17 shows two harq processes and an intertti of three. Thus multiple stopandwait harq processes are often done in parallel in practice. This pattern defines the hsupa simulated ue acknack pattern that determines the harq response. Why is downlink asynchronous and uplink synchronous in harq. Hsdpa allows data rates of up to 14 mbits in the downlink. After a data packet has been sent for a process, the sender does not have to wait for an acknowledgement, but rather can immediately send. Although ltem supports up to eight harq processes the timing restrictions of the technique is such. Hsupa high speed uplink packet access is a packetbased data service in wcdma uplink. Hsupa puts even more strenuous demands on the basestation design and will mean that the processing electronics will have to deal with a much more complex decode environment in the same way that hsdpa demands much more of the terminals in terms of decoding.
Dci format 1 in lte downlink long term evolution 4g. In this paper, we propose a technique to increase the chase combining efficiency. When the grant value is 0 deactivated process, no harq process should be scheduled. Hsupa enhances the uplink speed of umts wcdma networks and is the next step after hsdpa. Hsupa harq soft combining it provide robustness againt occasional transmission errors. Voice over ip voip, which can be the driver application to the migration to an. Enhanced uplink dedicated channel edch high speed uplink packet access hsupa. It displays the number of harq processes depending on the round trip time for the selected tti. As the usb drivers are included in windows, you need to plug in the usb device to the computer and the computer will automatically install the usb drivers.
H analyzing voip capacity with delay guarantee for integrated hspa networks. This cell selects the retransmission scheme for the harq process. A similar scheme as for hsdpa one main difference compared to hsdpa from the use of soft handover in uplink. Hsupa training or high speed uplink packet access training with handson exercises. Each hsdpa assignment is handled by a harq process. Since network the data source is the master and it has all the authorities for data transmission scheduling, it doesnt need any grant approval for data transmission. Each harq process uses rsn and the transmission time cfn, subframe elapsed since storing. An upgrade for umtshsdpa networks that increases upload data speeds up to 5. High speed packet access hspa is an amalgamation of two mobile protocols, high speed downlink packet access hsdpa and high speed uplink packet access hsupa, that extends and improves the performance of existing 3g mobile telecommunication networks using the wcdma protocols. Hsdpa terminal and commercial situation hsdpa solution driver to hsdpa. It means that in hsupa, the transmitter ue in this case has to have approval. Shorter tti 2ms or 10ms, node b centralized scheduling, multiple harq processes are the major features of hsupa network. Hsupa is more often called as the enhanced uplink dedicated channel edch by the technically aware people.
Chase combining is the simplest of harq algorithms. If the sender sends a packet and then waits for the ack to send another packet, it is called a sawstop and wait process. Achievable data rate an overview sciencedirect topics. A data card is a device used as a modem to connect to the internet.
After the ue has received an acknack for each harq process,or until the specific maximum number of retransmissions is reached, the ue startstransmitting with a new uplink tti length. Aug 06, 2015 the present invention includes transmitting data in a first transmission, receiving acknowledgement information for hybrid automatic repeatrequest pursuant to uplinkdownlink configurations 0 or 6 in timedivisionduplex mode for lte, determining the timing of a second transmission associated with a process for harq and transmitting data in a. Before answering your question i will give some brief overview of harq in lte. The effect of harq procedure on the performance of lte system 111 2. Hybrid automatic repeat request harq is used in highspeed uplink packet access hsupa to increase the data rate. The user file is restarted from the first bit by every apply. The invention relates to methods for improving a scheduling request transmission between a ue and a base station.
Ps data ergch information state this setting determines whether the ergch information ie is signaled to the ue during the setup of a pdp context. Depending on whether the block was received correctly or not, the ues harq process will tell its l1 to transmit an ack or nack on the uplink hsdpcch channel. The new data indicator ndi is used to distinguish between data blocks. Hsdpa hsupa iqproducer is pc application software for generating waveform patterns in compliance with 3gpp hsdpa hsupa uplink, downlink. Like hsdpa high speed downlink packet access, it offers increase data rates, whilst at the same time improving capacity.
Node b when hsdpa operations begin the ue harq process is responsible for. In hsdpa the resources shared between dl r99 transport channels and hsdpa transport channels are power and channelization codes. Harq buffer on the throughput of harqti, harqcc and harqir sec. The bler seen by rlc is much lower than the bler seen by the harq protocol. Edn understanding hsdpas implementation challenges. The current status for each of the up to eight harq processes is shown.
Hsscch type 3, hsscch type 3 overview, channelization code set, modulation scheme and tb number, pci, tb block size, harq process number, rv and cv. Harqack resource allocation and use for eimta nokia. This complicates the provision of hsdpa as the network is upgraded, but intelligent choices over basestation implementation can result in. It provides a time diversity and requires a small memory. If data is not received correctly, the node b will request the ue to resend the uplink packet data.
A hsupa connection using a 10 ms tti always uses 4 parallel harq processes whereas a connection using 2 ms tti always use 8 parallel harq processes. If this ie is signaled, the ue will listen for updownhold commands on the ergch. This field indicates the harq process number used by the higher layers for the current pdsch codeword. Hsupa training or high speed uplink packet access training. Understanding hsdpas implementation challenges ee times. We investigate the more complex case of a link employing bit interleaved coded modulation bicm 10 and study the performance with both baseband compression and the more conventional llr compression of the previously received packets sec.
The 3g hsdpa upgrade includes several changes that are built onto the basic 3gpp umts standard. Hsdpa uses a hybrid automatic repeat request harq protocol to handle retransmissions and to guarantee errorfree data transmission. High speed uplink packet access hsupa highspeed uplink packet access hsupa is a 3g mobile telephony protocol in the hspa family. The invention provides a terminal uplinkdownlink harq hybrid automatic repeat request acknack acknowledgementnegative acknowledgement information dispatching method and device. Umts hsdpa uplink hsdpcch view for cqi feedback cycle 1. The harq process to be used in the next transmission time interval is thereby always assumed to be activated for the transmission of nonscheduled control data. The transmission of the scheduling request is postponed, by implementing a threshold that the data in the transmission buffer has to reach, before a transmission of the scheduling request is triggered. The fast harq of hsupa is implemented by adding an harq functional entity in node b. The effect of harq procedure on the performance of lte system. When any value other than 0, a particular or all harq process should be activated. In this method, harq transmissions are seen as additional receive antennas which are.
A user equipment ue may send an access preamble for random access while in an inactive state and may receive a message containing resources allocated to the ue. Number of bits 3 fdd 4 tdd range 07 fdd 015 tdd new data indicator. Repeat this process iv when the enodeb receives the 8 th pusch, it put the pusch into the 8th ul harq buffer buf7 in the enodeb v when the enodeb receives the 9 th pusch, it put the pusch into the first ul harq buffer buf0 in the enodeb repeat this process. Each harq process is assigned an identifier p 0 or 1 in the figure, which is used to couple the processes in the transmitter and the receiver.
Techniques for supporting operation with enhanced uplink in inactive state are described. Hybrid automatic repeat request harq multiple harq processes allow efficient use of the transmit and processing time for data packets. Hybrid automatic repeat request hybrid arq or harq is a combination of highrate forward. It is because there is some subframes where you cannot allocate full rbs 100 rbs in case of 20mhz, cat 3. The user file length can be specified up to the maximum 18000 bits. For the ue receiver, there are also modified dchsupa requirements for the receiver susceptibility to. Harq process relies upon receiving ack for the packets. If the actual load is less than or equal to 75%, the hsupa user throughput should be higher than to maxgbr, 1 rlc pdu rate. Highspeed uplink packet access technology tutorial. Analyzing voip capacity with delay guarantee for integrated. Us8867455b2 enhanced uplink for inactive state in a. When the grant value is 0 deactivated process, no harq process should be. Harq process id i may be applicable if there is an sps grant in subframe i.
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