WO2008114198A2 - Reporting of retransmissions for downlink packet - Google Patents

Reporting of retransmissions for downlink packet Download PDF

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Publication number
WO2008114198A2
WO2008114198A2 PCT/IB2008/050991 IB2008050991W WO2008114198A2 WO 2008114198 A2 WO2008114198 A2 WO 2008114198A2 IB 2008050991 W IB2008050991 W IB 2008050991W WO 2008114198 A2 WO2008114198 A2 WO 2008114198A2
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WO
WIPO (PCT)
Prior art keywords
report
data packet
station
transmissions
secondary station
Prior art date
Application number
PCT/IB2008/050991
Other languages
French (fr)
Other versions
WO2008114198A3 (en
Inventor
Paul Bucknell
Matthew P.J. Baker
Timothy J. Moulsley
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008114198A2 publication Critical patent/WO2008114198A2/en
Publication of WO2008114198A3 publication Critical patent/WO2008114198A3/en

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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
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • 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
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • 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]

Definitions

  • the invention relates to a communication system comprising a primary station (Node B or base station, BS) and a secondary station (User Equipment or mobile station) wherein the primary station is able to blindly retransmit the same data packet to a secondary station, and to the associated method.
  • BS Node B or base station
  • BS User Equipment
  • mobile station User Equipment
  • HS-DSCH will be used when the UE is in CELL F ACH state.
  • no HARQ (Hybrid ARQ) feedback (ACKS for acknowledgement or NACKS for non- acknowledgement) will be used, instead the NodeB blindly retransmits the HARQ data and the 'new data' indicator is used to indicate a new transmission or a repeated transmission (quick repeat) that can be combined in the UE.
  • HS-DSCH reception in CELL FACH state is enabled by the network (UTRAN) by state parameters in the system information that is broadcast in each cell. These state parameters include HS-SCCH (High Speed Shared Control Channel) configuration, HS-DSCH configuration and a common H-RNTI (HSDPA Radio Network Temporary Identifier). UTRAN may also reconfigure HS-DSCH reception parameters (e.g. H- RNTI) by dedicated RRC (Radio resource) signalling. When the UE detects the correct H-RNTI value the UE shall receive the corresponding
  • HS-DSCH TTI Transmission Time Interval
  • CRC Cyclic Redundancy Check
  • the UE passes the data to MAC-hs, which controls access to HS-DSCH transport channel) for reassembly and reordering; after MAC-hs processing, the UE passes the complete MAC-hs SDU directly to the corresponding Radio Link Control (RLC) entity.
  • RLC Radio Link Control
  • the UE For uplink transmission the UE shall use the RACH.
  • the UE can send reports of the measured downlink channel quality to the RNC using the RACH.
  • the HS-DSCH data frame header includes a "Transmit Power Level" field in which the RNC can include the received measurement results from the RACH, to inform the Node B.
  • the Node B HS-DSCH scheduler can use this information to determine parameters like Modulation and coding scheme (MCS) and DL transmit power for the HS-SCCH and HS-PDSCH transmissions.
  • MCS Modulation and coding scheme
  • An object of the present invention is to reduce the overhead and delay of the currently- defined channel quality reporting mechanism for the operation of HS-DSCH in state CELL FACH.
  • This invention proposes that the UE sends back to the NodeB either an indication of the number of re-transmissions that were required to successfully decode the HARQ data.
  • a communication system comprising a primary station and at least one secondary station, the primary station being able to carry out repeated transmissions of a data packet to the secondary station, the secondary station comprising decoding means for decoding the repeated transmissions of the data packet, and transmitting means for transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet.
  • a secondary station comprising receiving means for receiving repeated transmissions of a data packet from a primary station, decoding means for decoding the repeated transmissions of the data packet, and transmitting means for transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet.
  • the report is based on an average of the number of transmissions required to decode correctly a predetermined number of data packets.
  • the information contained in the report is less biased by a particularly high (or low) number of retransmissions required to decode correctly a packet.
  • the report is based on an average of the number of transmissions required to decode correctly a number of data packets transmitted over a period.
  • these averages is one among the following: mean, mode, median, x th percentile.
  • the report is based on the comparison of the number of transmission required for decoding correctly a data packet with a predetermined threshold. This permits to reduce the overhead. Indeed, it is possible to signal whether the number is above or below a threshold. It is also possible to have several threshold and the indicator indicates between which thresholds the number or required retransmissions is required.
  • a primary station comprising a transmitting means for carrying out repeated transmissions of a data packet to a secondary station, receiving means for receiving a report from the secondary station based on the number of transmissions required to decode correctly the data packet, and control means for modifying a transmission repetition parameter based on the report.
  • a method of communication between a primary station and at least one secondary station comprising, at the primary station, carrying out repeated transmissions of a data packet to the secondary station, at the secondary station, decoding the repeated transmissions of the data packet, and transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet, and at the primary station, modifying a transmission repetition parameter based on the report.
  • the indication of the number of retransmissions could comprise an average number of retransmissions, or an indication that the number of retransmission has exceeded some pre-defined limit or average limit, or the highest number of retransmissions in a predetermined preceding time interval, or another statistical measure of the number of retransmissions.
  • This indication of the number of retransmissions will be used by the NodeB to control either the HS-DSCH power, modulation and coding scheme (MCS) and/or the number of blind repetitions.
  • MCS modulation and coding scheme
  • the signalling from the UE to the NodeB could for example be implemented by signalling the said number as part of a MAC message on the RACH. This will both decrease the load on the RACH and significantly increase the speed at which the NodeB can adapt the HS-DSCH to make optimal use of the scarce radio resource.
  • triggering of the reporting of the number of retransmissions can be:
  • a linked event such as a particular type of RRC measurement report sent to the RNC.
  • the uplink signalling on the RACH would be reduced to a 1 bit indicator. This could indicate that the number of retransmissions was above or below the pre-defined limit, or preferably only that the number of retransmissions was above the pre-defined limit.
  • the average number of retransmissions that were required to successfully decode the HARQ data over a signalled period of time could be signalled.
  • the average fraction of data packets incorrectly received over a signalled period of time could be signalled
  • Suitable averages could for example include the mean, mode, median, xth percentile, or similar. Additionally the triggering of the reporting of the number of re-transmissions that were required to successfully decode the HARQ data, could be linked to other measurements that the UE has available like the Channel quality indicator (CQI). In this case when the UE detects that the channel quality is poor then the number of retransmissions (or a single bit) is sent from the UE to the NodeB if the number of retransmissions exceeds the configured threshold.
  • CQI Channel quality indicator
  • Fig.l already described, is a schematic representation of the prior art.
  • Fig.2 is schematic representation of the invention.
  • the HARQ Data packet 0 is sent with 2 blind re-transmissions and then the UE reports on the RACH the number of retransmissions that was required to successfully decode the HARQ data packet.
  • the NodeB could for example be done by sending a MAC header on the RACH.
  • the MAC header could also contain the UE identity.
  • the UE Identity may refer explicitly to an individual UE or to a group of UEs with the same identity. This information can be used by the NodeB to change transmissions parameters for the HARQ data packets, such as the number of retransmissions or transmission power level.
  • the MAC Header could be sent alone without the number of re-transmissions; in this case the MAC header would still indicate the UE Identity but the presence of this MAC header alone would provide information to the NodeB that a specific UE or one of a group of UEs was having difficulty decoding the HARQ data (e.g. the single bit indicator referred to above that an indication of the number of retransmissions had exceeded a predetermined threshold).
  • a single-bit physical- layer indicator is used to signal that an event has been triggered in the UE related to the number of re-transmissions that were required to successfully decode the HARQ data.
  • This indicator could be signalled by using a specific RACH access slot, or a specific RACH access preamble, or a specific sub-carrier frequency.
  • Different thresholds for the reporting could be configured depending for example on a quality of service criterion, such as priority, delay requirement, packet error rate requirement, subscription level of the user, or similar. For example, a user with a tight QoS requirement could be required to signal the indication if it was needing a large number of retransmissions to decode each packet.
  • the invention can be applied in improving the operation of HS-DSCH in CELL F ACH state for UMTS Release 7. And can be considered as part of HSPA improvements targeted for Release-8. Additionally this technique could be adopted for UMTS LTE.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

A method of communication between a primary station and at least one secondary station, comprising, at the primary station, carrying out repeated transmissions of a data packet to the secondary station, at the secondary station, decoding the repeated transmissions of the data packet, and transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet, and at the primary station, modifying a transmission repetition parameter based on the report.

Description

REPORTING OF RETRANSMISSIONS FOR DOWNLINK PACKET
FIELD OF THE INVENTION
The invention relates to a communication system comprising a primary station (Node B or base station, BS) and a secondary station (User Equipment or mobile station) wherein the primary station is able to blindly retransmit the same data packet to a secondary station, and to the associated method.
BACKGROUND OF THE INVENTION
In Release-7 UMTS, it has been decided that the high-speed downlink shared channel
(HS-DSCH) will be used when the UE is in CELL F ACH state. In this state, no HARQ (Hybrid ARQ) feedback (ACKS for acknowledgement or NACKS for non- acknowledgement) will be used, instead the NodeB blindly retransmits the HARQ data and the 'new data' indicator is used to indicate a new transmission or a repeated transmission (quick repeat) that can be combined in the UE.
The current state of the art for CELL FACH operation is captured in 3GPP TS 25.308, High Speed Downlink Packet Access (HSDPA); Overall description; Stage 2. This operation is summarised below, and illustrated on Figure 1 :
HS-DSCH reception in CELL FACH state is enabled by the network (UTRAN) by state parameters in the system information that is broadcast in each cell. These state parameters include HS-SCCH (High Speed Shared Control Channel) configuration, HS-DSCH configuration and a common H-RNTI (HSDPA Radio Network Temporary Identifier). UTRAN may also reconfigure HS-DSCH reception parameters (e.g. H- RNTI) by dedicated RRC (Radio resource) signalling. When the UE detects the correct H-RNTI value the UE shall receive the corresponding
HS-DSCH TTI (Transmission Time Interval); if after decoding the data, the Cyclic Redundancy Check (CRC) is correct the UE passes the data to MAC-hs, which controls access to HS-DSCH transport channel) for reassembly and reordering; after MAC-hs processing, the UE passes the complete MAC-hs SDU directly to the corresponding Radio Link Control (RLC) entity.
For uplink transmission the UE shall use the RACH.
The UE can send reports of the measured downlink channel quality to the RNC using the RACH. The HS-DSCH data frame header includes a "Transmit Power Level" field in which the RNC can include the received measurement results from the RACH, to inform the Node B. The Node B HS-DSCH scheduler can use this information to determine parameters like Modulation and coding scheme (MCS) and DL transmit power for the HS-SCCH and HS-PDSCH transmissions.
However, the reporting of channel quality in RRC messages to the RNC (Radio Network Controller) as currently specific has several drawbacks, including:
• The overhead of sending RRC messages on the RACH (using RLC AM mode), and the subsequent uplink interference caused
• The time delay in the NodeB receiving the channel quality reports
An object of the present invention is to reduce the overhead and delay of the currently- defined channel quality reporting mechanism for the operation of HS-DSCH in state CELL FACH.
SUMMARY OF THE INVENTION
This invention proposes that the UE sends back to the NodeB either an indication of the number of re-transmissions that were required to successfully decode the HARQ data. Thus, according to a first aspect of the invention, it is proposed a communication system comprising a primary station and at least one secondary station, the primary station being able to carry out repeated transmissions of a data packet to the secondary station, the secondary station comprising decoding means for decoding the repeated transmissions of the data packet, and transmitting means for transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet.
According to a second aspect of the invention, it is proposed a secondary station comprising receiving means for receiving repeated transmissions of a data packet from a primary station, decoding means for decoding the repeated transmissions of the data packet, and transmitting means for transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet.
In a variant of the invention, in the secondary station of this aspect of the invention, the report is based on an average of the number of transmissions required to decode correctly a predetermined number of data packets.
By doing this, the information contained in the report is less biased by a particularly high (or low) number of retransmissions required to decode correctly a packet.
In another variant of the invention, the report is based on an average of the number of transmissions required to decode correctly a number of data packets transmitted over a period. In still another variant of the invention, these averages is one among the following: mean, mode, median, xth percentile.
In another example of the invention, the report is based on the comparison of the number of transmission required for decoding correctly a data packet with a predetermined threshold. This permits to reduce the overhead. Indeed, it is possible to signal whether the number is above or below a threshold. It is also possible to have several threshold and the indicator indicates between which thresholds the number or required retransmissions is required. According to a third aspect of the invention, it is proposed a primary station comprising a transmitting means for carrying out repeated transmissions of a data packet to a secondary station, receiving means for receiving a report from the secondary station based on the number of transmissions required to decode correctly the data packet, and control means for modifying a transmission repetition parameter based on the report.
According to a fourth aspect of the invention, it is proposed a method of communication between a primary station and at least one secondary station, comprising, at the primary station, carrying out repeated transmissions of a data packet to the secondary station, at the secondary station, decoding the repeated transmissions of the data packet, and transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet, and at the primary station, modifying a transmission repetition parameter based on the report.
The indication of the number of retransmissions could comprise an average number of retransmissions, or an indication that the number of retransmission has exceeded some pre-defined limit or average limit, or the highest number of retransmissions in a predetermined preceding time interval, or another statistical measure of the number of retransmissions.
This indication of the number of retransmissions will be used by the NodeB to control either the HS-DSCH power, modulation and coding scheme (MCS) and/or the number of blind repetitions.
The signalling from the UE to the NodeB could for example be implemented by signalling the said number as part of a MAC message on the RACH. This will both decrease the load on the RACH and significantly increase the speed at which the NodeB can adapt the HS-DSCH to make optimal use of the scarce radio resource.
Additionally the triggering of the reporting of the number of retransmissions can be:
• A limit on the number of acceptable retransmissions that were required to decode the HARQ data (this limit could for example be signalled to the UE by means of RRC signalling)
• An RRC-signalled timer expiration, to force regular reporting, or periodic reporting. This could also be done with a counter counting the number of data packets received.
• A particular event such as cell reselection, or a handover,
• A linked event such as a particular type of RRC measurement report sent to the RNC.
As an alternative to signalling the number of number of retransmissions that were required to successfully decode the HARQ data, if an RRC-signalled pre-defined limit for the number of retransmissions was used then the uplink signalling on the RACH would be reduced to a 1 bit indicator. This could indicate that the number of retransmissions was above or below the pre-defined limit, or preferably only that the number of retransmissions was above the pre-defined limit.
As a further alternative to signalling the number of retransmissions required, the average number of retransmissions that were required to successfully decode the HARQ data over a signalled period of time could be signalled.
As a further alternative to signalling the number of retransmissions required, the average fraction of data packets incorrectly received over a signalled period of time could be signalled
Suitable averages could for example include the mean, mode, median, xth percentile, or similar. Additionally the triggering of the reporting of the number of re-transmissions that were required to successfully decode the HARQ data, could be linked to other measurements that the UE has available like the Channel quality indicator (CQI). In this case when the UE detects that the channel quality is poor then the number of retransmissions (or a single bit) is sent from the UE to the NodeB if the number of retransmissions exceeds the configured threshold.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig.l, already described, is a schematic representation of the prior art. Fig.2 is schematic representation of the invention.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
In a first embodiment, shown in figure 2, the HARQ Data packet 0 is sent with 2 blind re-transmissions and then the UE reports on the RACH the number of retransmissions that was required to successfully decode the HARQ data packet.
This could for example be done by sending a MAC header on the RACH. In this case the MAC header could also contain the UE identity. The UE Identity may refer explicitly to an individual UE or to a group of UEs with the same identity. This information can be used by the NodeB to change transmissions parameters for the HARQ data packets, such as the number of retransmissions or transmission power level.
In a second embodiment the MAC Header could be sent alone without the number of re-transmissions; in this case the MAC header would still indicate the UE Identity but the presence of this MAC header alone would provide information to the NodeB that a specific UE or one of a group of UEs was having difficulty decoding the HARQ data (e.g. the single bit indicator referred to above that an indication of the number of retransmissions had exceeded a predetermined threshold).
In a third embodiment a single-bit physical- layer indicator is used to signal that an event has been triggered in the UE related to the number of re-transmissions that were required to successfully decode the HARQ data. This indicator could be signalled by using a specific RACH access slot, or a specific RACH access preamble, or a specific sub-carrier frequency.
Different thresholds for the reporting could be configured depending for example on a quality of service criterion, such as priority, delay requirement, packet error rate requirement, subscription level of the user, or similar. For example, a user with a tight QoS requirement could be required to signal the indication if it was needing a large number of retransmissions to decode each packet.
The invention can be applied in improving the operation of HS-DSCH in CELL F ACH state for UMTS Release 7. And can be considered as part of HSPA improvements targeted for Release-8. Additionally this technique could be adopted for UMTS LTE.

Claims

1. A communication system comprising a primary station and at least one secondary station, the primary station being able to carry out repeated transmissions of a data packet to the secondary station, the secondary station comprising decoding means for decoding the repeated transmissions of the data packet, and transmitting means for transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet.
2. A secondary station comprising receiving means for receiving repeated transmissions of a data packet from a primary station, decoding means for decoding the repeated transmissions of the data packet, and transmitting means for transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet.
3. A secondary station as claimed in claim 2, wherein the report is based on an average of the number of transmissions required to decode correctly a predetermined number of data packets.
4. A secondary station as claimed in claim 2, wherein the report is based on an average of the number of transmissions required to decode correctly a number of data packets transmitted over a period.
5. A secondary station as claimed in any of claims 2 to 4, wherein the average is one among the following: mean, mode, median, xth percentile.
6. A secondary station as claimed in claim 2, wherein the report is based on the comparison of the number of transmission required for decoding correctly a data packet with a predetermined threshold.
7. A primary station comprising a transmitting means for carrying out repeated transmissions of a data packet to a secondary station, receiving means for receiving a report from the secondary station based on the number of transmissions required to decode correctly the data packet, and control means for modifying a transmission repetition parameter based on the report.
8. A method of communication between a primary station and at least one secondary station, comprising, at the primary station, carrying out repeated transmissions of a data packet to the secondary station, at the secondary station, decoding the repeated transmissions of the data packet, and transmitting a report to the primary station, said report being based on the number of transmissions required to decode correctly the data packet, and at the primary station, modifying a transmission repetition parameter based on the report.
PCT/IB2008/050991 2007-03-21 2008-03-17 Reporting of retransmissions for downlink packet WO2008114198A2 (en)

Applications Claiming Priority (2)

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EP07300891.4 2007-03-21
EP07300891 2007-03-21

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US20200396023A1 (en) * 2019-06-14 2020-12-17 Qualcomm Incorporated Downlink decoding feedback for hybrid automatic repeat request-less transmission modes
EP3796582A4 (en) * 2018-05-17 2022-03-02 China Mobile Communication Co., Ltd Research Institute Information reporting method, data transmission method, user equipment and network side device

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WO2019019133A1 (en) * 2017-07-28 2019-01-31 富士通株式会社 Command instruction method and device, and information interaction method and device
CN110771076A (en) * 2017-07-28 2020-02-07 富士通株式会社 Command indication method and device and information interaction method and device
US11202337B2 (en) 2017-07-28 2021-12-14 Fujitsu Limited Command indication method and apparatus and information interaction method and apparatus
US11272568B2 (en) 2017-07-28 2022-03-08 Fujitsu Limited Command reception method and apparatus and communication system
US11723114B2 (en) 2017-07-28 2023-08-08 Fujitsu Limited Command indication method and apparatus and information interaction method and apparatus
US11997758B2 (en) 2017-07-28 2024-05-28 Fujitsu Limited Command indication method and apparatus and information interaction method and apparatus
EP3796582A4 (en) * 2018-05-17 2022-03-02 China Mobile Communication Co., Ltd Research Institute Information reporting method, data transmission method, user equipment and network side device
US11902809B2 (en) 2018-05-17 2024-02-13 China Mobile Communication Co., Ltd Research Institute Information reporting method, data transmission method, user equipment and network side device
US20200396023A1 (en) * 2019-06-14 2020-12-17 Qualcomm Incorporated Downlink decoding feedback for hybrid automatic repeat request-less transmission modes

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TW200904058A (en) 2009-01-16

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