WO2004019544A1 - Multiple harq processes hangling method - Google Patents
Multiple harq processes hangling method Download PDFInfo
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- WO2004019544A1 WO2004019544A1 PCT/EP2003/006627 EP0306627W WO2004019544A1 WO 2004019544 A1 WO2004019544 A1 WO 2004019544A1 EP 0306627 W EP0306627 W EP 0306627W WO 2004019544 A1 WO2004019544 A1 WO 2004019544A1
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- WIPO (PCT)
- Prior art keywords
- harq processes
- harq
- reserved
- additional
- processes
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1803—Stop-and-wait protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
Definitions
- Figures 7-9 illustrate several examples of predictive scheduling HARQ processes.
- UMTS Universal Mobile Telecommunication System
- the network elements are functionally grouped into Core Network (CN), UMTS Terrestrial Radio Access Network (UTRAN) and User Equipment (UE).
- CN Core Network
- UTRAN UMTS Terrestrial Radio Access Network
- UE User Equipment
- UTRAN is responsible for handling all radio-related functionality
- CN is responsible for routing calls and data connections to external networks.
- the interconnections of these network elements are defined by open interfaces as can be seen in the Figure. It should be noted that UMTS system is modular and it is therefore possible to have several network elements of the same type.
- the scheduler will consider these parameters in allocating resources to different UEs.
- the scheduling function controls the allocation of the channel (HS-DSCH) to different users or to data flows of the same user, the current MCS level in one TTI and manages existing HARQ instances for each user.
- the scheduler decides which of the N HARQ processes shall be used for transmission.
- Each HARQ process can have different window sizes.
- HSDPA there is only a single HARQ process scheduled each TTI and each process works as a SAW protocol which corresponds to selective repeat ARQ with window size 1.
- TTI transmission time intervals
- the HARQ process number as well as the sequence number has to be signalled separately to allow a proper combining even if the packet is not received correctly.
- the 1 bit sequence number is called New Data Indicator (NDI). Each time a new packet has been sent, the NDI is incremented.
- the HARQ process ID and the NDI are signalled on the HS-SCCH.
- each packet has a Transmission Sequence Number (TSN) for reordering of correctly received packets.
- TSN Transmission Sequence Number
- This information is signalled inband (of the HS-DSCH) in an header that is part of the packet.
- the TSN is increased for new each packet that is send by the transmitter.
- the receiver will check the TSN after successful decoding of an packet and deliver the packet only to higher layer if there is no previous packet of that data flow missing.
- the received packet will be stored in the reordering buffer to wait for outstanding packets and to ensure in sequence delivery to higher layer. If the reordering buffer is full because the receiver is waiting for an outstanding packet for a long time the transmission must be stopped to avoid dropping or overwriting of packets.
- Radio resource signalling such as to prepare for or to carry out handover when changing the serving cell.
- Other radio resource management information may also be scheduled in-between of data transmission. This signalling is usually of low rate, but has to be very fast to avoid packet or even call drops.
- Additional HARQ processes also cause an increased signalling range for identifying the HARQ process to the UE.
- the signalling of the HARQ process ID via a shared control channel is usually done by a fixed number of bits. Additional bits for the signalling may not be necessary because the number of HARQ processes that can be signalled is in the range of the power of two (e.g. 8 HARQ processes).
- the method of configuring an additional HARQ process consequently requires that additional soft buffer memory is reserved for combining.
- additional soft buffer memory is reserved for combining.
- the soft buffer size for such limited HARQ processes is minimized.
- An additional advantage of adding an HARQ process resides in the fact that all ongoing regular HARQ processes are not affected and that consequently the data throughput is not reduced.
- a traffic descriptor could for instance indicate the kind of data (e.g. control data, radio resource control, SIP signalling etc.) to the transmitter. Based on this, the transmitter knows the characteristics of that data and how it shall be transmitted. Thus a proper selection of the HARQ channel can be performed.
- data e.g. control data, radio resource control, SIP signalling etc.
- the packet size will have the main impact on the transport format. For small packets only a limited number of resources need to be allocated (e.g. codes, frequencies, time slots). Even if a low code rate is used to make the transmission more reliable there may not be a need for higher order modulations, etc. and a low MCS level could be used. Therefore based on these parameter the transmitter can select an additional or reserved or HARQ process.
- resources e.g. codes, frequencies, time slots.
- Predictive scheduling performance is a tradeoff between channel prediction accuracy and prediction length.
- Channel prediction performance decreases with increasing prediction length.
- channel prediction is given 6 TTIs in the future, that is a certain MCS level can be allocated to any of 6 TTIs according to the predicted channel state.
- round trip time is less than prediction horizon and is equal to 5 TTIs.
- One HARQ process is additional and with limited functionality (that is, only the lowest MCS level 1 can be used for transmission with this process).
- Data transmission to the same UE is consecutively scheduled for 6 TTIs (prediction horizon).
- HARQ processes are allocated 5 TTIs in advance, while the decision on process allocation in the 6 th TTI is deferred until receiving first feedback.
- a NACK for process 1 has arrived, but also high priority data packets are available for instantaneous transmission. It is not possible to use processes 2-5 because feedback has not been received for them. It is not possible to use process 1 either because it is in the state of packet combining.
- RLC sublayer Apart from the retransmission protocol at the MAC-hs sublayer, there can also be a retransmission protocol in RLC sublayer (if configured to work in acknowledged mode) and in reliable transport control protocol layer (e.g. TCP). To reduce latency, it may be useful to assign the packets retransmitted by higher layers to reserved/additional HARQ processes.
- reliable transport control protocol layer e.g. TCP
- the invention discloses an intelligent method for a flexible scheduling of multiple parallel hybrid ARQ processes while transmitting data of different priority.
- the latency is reduced without having to flush the data bits corresponding to outstanding retransmissions in the soft buffer of the UE.
- resource allocation parameters such as data flow ID, priority, traffic descriptor, packet size etc. associated to the data
- the transmitter selects one of the available HARQ processes to satisfy QoS requirements.
- the transmitter uses the available radio resources efficiently.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004529977A JP4312716B2 (en) | 2002-08-13 | 2003-06-24 | Multiple HARQ processing handling method |
US10/524,141 US7471693B2 (en) | 2002-08-13 | 2003-06-24 | Multiple HARQ processes handling method |
AU2003238037A AU2003238037A1 (en) | 2002-08-13 | 2003-06-24 | Multiple harq processes hangling method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02018086A EP1389848B1 (en) | 2002-08-13 | 2002-08-13 | Hybrid automatic repeat request protocol |
EP02018086.5 | 2002-08-13 |
Publications (1)
Publication Number | Publication Date |
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WO2004019544A1 true WO2004019544A1 (en) | 2004-03-04 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2003/006627 WO2004019544A1 (en) | 2002-08-13 | 2003-06-24 | Multiple harq processes hangling method |
Country Status (8)
Country | Link |
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US (1) | US7471693B2 (en) |
EP (3) | EP1389848B1 (en) |
JP (1) | JP4312716B2 (en) |
CN (2) | CN100375420C (en) |
AT (2) | ATE467958T1 (en) |
AU (1) | AU2003238037A1 (en) |
DE (2) | DE60236377D1 (en) |
WO (1) | WO2004019544A1 (en) |
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EP2184884B1 (en) | 2014-05-07 |
ATE467958T1 (en) | 2010-05-15 |
JP4312716B2 (en) | 2009-08-12 |
CN1689262A (en) | 2005-10-26 |
US20060092972A1 (en) | 2006-05-04 |
EP1710946B1 (en) | 2010-05-12 |
EP1710946A1 (en) | 2006-10-11 |
EP2184884A2 (en) | 2010-05-12 |
CN101222308B (en) | 2014-09-10 |
CN101222308A (en) | 2008-07-16 |
EP1389848A1 (en) | 2004-02-18 |
JP2005536160A (en) | 2005-11-24 |
DE60217098T2 (en) | 2007-05-03 |
DE60217098D1 (en) | 2007-02-08 |
DE60236377D1 (en) | 2010-06-24 |
CN100375420C (en) | 2008-03-12 |
EP1389848B1 (en) | 2006-12-27 |
ATE349829T1 (en) | 2007-01-15 |
AU2003238037A1 (en) | 2004-03-11 |
US7471693B2 (en) | 2008-12-30 |
EP2184884A3 (en) | 2011-01-26 |
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