WO2009023986A1 - The method and the device for triggered repeat in the multicast system - Google Patents
The method and the device for triggered repeat in the multicast system Download PDFInfo
- Publication number
- WO2009023986A1 WO2009023986A1 PCT/CN2007/002504 CN2007002504W WO2009023986A1 WO 2009023986 A1 WO2009023986 A1 WO 2009023986A1 CN 2007002504 W CN2007002504 W CN 2007002504W WO 2009023986 A1 WO2009023986 A1 WO 2009023986A1
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- WO
- WIPO (PCT)
- Prior art keywords
- threshold
- retransmission
- enb
- nack signaling
- condition
- Prior art date
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
- G08C25/02—Arrangements for preventing or correcting errors; Monitoring arrangements by signalling back receiving station to transmitting station
-
- 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
- H04L1/0021—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 in which the algorithm uses adaptive thresholds
-
- 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
- H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
-
- 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
- H04L1/1838—Buffer management for semi-reliable protocols, e.g. for less sensitive applications such as streaming video
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
-
- 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
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0093—Point-to-multipoint
Definitions
- the present invention relates to a multicast system, and more particularly to a retransmission triggering method in a multicast system and a system for implementing the same.
- E-MBMS is an evolution of multimedia broadcast and multicast services in 3GPP LTE.
- MBMS transmission can be performed in two ways: multi-cell transmission and single-cell transmission.
- the present invention generally relates to a single cell transmission mode.
- MTCH MBMS Traffic Channel
- DL-SCH Down Ink Synchronization Channel
- the DL-SCH is mapped primarily through a dedicated traffic channel (DTCH).
- DTCH dedicated traffic channel
- technologies such as HARQ, adaptive modulation and transmission power, dynamic or semi-static resource allocation, and feedback CQI.
- the MTCH When the MTCH is mapped to the DL-SCH, this part of the DL_SCH should be broadcast throughout the cell.
- 3GPP applies a procedure similar to that used by the DL-SCH unicast service, such as HARQ (Hybrid Automatic Repeat Request) ⁇ and HSDPA (High Similar to Speed Downlink Packet Access), physical HARQ can reduce the block error rate of the receiver to achieve higher transmission performance. But the price is to reduce part of the transmission efficiency.
- the BLER of the first transmission is between 10% and 30%, which can achieve the optimal performance-efficiency ratio.
- the probability theory if n users are located in the same cell, the error probability for all UEs in the first transmission is ⁇ , then the probability that at least one UE receives the error block is 1-(1- ⁇ ) ⁇ . If the UE The number is large and the probability becomes very large. Therefore, certain mechanisms should be used to limit the feedback of NACK signaling, or to trigger retransmission of data blocks.
- the goal is to first limit the UE with a BLER less than 30% to feed back the NACK, and secondly, limit the eNB's retransmission probability, for example, to 50%. On the other hand, if the UE reports too many NACKs, the uplink will be overloaded, so the number of NACK signaling should be limited when the UE receives the error block.
- the technology of the present invention relates to a method for triggering retransmission when HARQ is applied to a multicast system, regardless of the manner in which the UE feeds back NACK signaling and the manner in which the eNB retransmits.
- a retransmission triggering method in a multicast system including the steps of: the base station eNB sets a retransmission condition according to a channel state indication, and sends the set retransmission condition to the user equipment UE; When the UE receives the error block, the channel state indication of the current UE is compared with the received retransmission condition. When the retransmission condition is met, the UE feeds back the negative acknowledgement NACK signaling to the eNB to trigger the retransmission.
- a retransmission triggering system comprising: a retransmission condition setting device at a base station eNB, setting a retransmission condition according to a channel state indication, and transmitting the set retransmission condition to a user The device UE; the retransmission condition comparing device at the user equipment UE, when the UE receives the error block, compares the channel state indication of the current UE with the received retransmission condition, and when the retransmission condition is met, the UE feeds back to the eNB. Negatively acknowledge NACK signaling to trigger a retransmission.
- the triggering of the NACK signaling is restricted by restricting the condition that the UE feeds back the NACK signaling. Therefore, the feedback signaling in the uplink channel is limited, and the retransmission probability is limited to an appropriate region in a manner similar to Rel 6 HSDPA, thereby achieving an optimum ratio of efficiency to power. Uplink overload is avoided due to the limited number of NACK signaling. At the same time, the optimal ratio of efficiency to power is achieved by limiting the probability of retransmission.
- FIG. 1 is a schematic view showing the present invention by taking BLER as an example
- Figure 2 is a schematic view for explaining a threshold definition according to the present invention.
- FIG. 3 is a flow chart of a retransmission triggering method in accordance with the present invention.
- FIG. 4 is a schematic block diagram of a retransmission triggering system in accordance with the present invention. detailed description
- the technology is designed to extend the cell edge or increase throughput.
- the main point is to extend the cell edge and provide transmission performance that meets the error block rate requirement at the cell edge.
- the cell edge is indicated by a solid line.
- the BLER is 0.01 and the coverage is 70 3 ⁇ 4.
- the BLER is 0.3.
- the purpose of using HARQ is to extend the cell edge from 70% to 90%, or to reduce the BLER at the cell boundary of 90% coverage from 0.3 to 0.01 o.
- the retransmission trigger system 400 may include: a feedback condition setting means 401 located at the eNB and a feedback condition comparing means 402 located at the UE.
- the feedback condition setting device 401 includes a static threshold setting module 403, a dynamic threshold setting module 405, and an output module 407.
- the output module 407 sends the thresholds generated by the static threshold setting module 403 and the dynamic threshold setting module 405 to the receiving module 408 of the feedback condition comparing means 402 via the control channel.
- the dynamic threshold setting module 405 is optional in the static domain value scheme.
- the feedback condition comparison means 402 further includes a random number generation module 410, a threshold comparison module 412, a probability calculation module 414, and a NACK feedback module 416.
- the threshold comparison module 412 compares the received threshold with the current instantaneous channel state parameter of the UE to determine whether to feed back NACK signaling to the eNB to trigger retransmission.
- a condition for feeding back NACK signaling when the UE receives the error block is set.
- This condition can be two thresholds A and 8.
- the threshold can be limited to:
- threshold A and the threshold B can be configured by the eNB. As shown in FIG. 2, for example, the actual meaning of threshold A and threshold B may be corresponding to the boundary of coverage in the cell. Other channel state indications can also be used to set thresholds, such as signal to noise ratios and the like. Assuming a measured value or statistical value is X, X can be BER or BLER in different cases. So, you can use the following detailed steps:
- X is defined as BER or BLER
- the UE does not feed back NACK signaling.
- the UE may feed back NACK signaling. Therefore, as shown in FIG. 2, the UE far from the eNB is located outside the threshold A (for example, UE3), and there is no need to feed back NACK signaling. Because it is assumed that under the same channel conditions, even if retransmitted, the probability of correctly receiving the previous error block is very low. Since the BLER requirement (less than 1%) has been met and the UE close to the eNB is located inside the threshold B (e.g., UE1), there is no need to feed back NACK signaling. Since HARQ will correct the error block received by the UE in the area, only the UE (e.g., UE2) located between the threshold A and the threshold B should feed back the NACK signaling.
- the threshold A for example, UE3
- BLER is taken as an example for description.
- condition for feeding back NACK signaling when the UE receives the error block can be set as:
- step 302 when an error block is received, the UEs satisfying the above conditions feed back NACK signaling.
- the lower limit is extended from 0.1 to 0.05, and the effective UE that feeds back NACK signaling is in the region of 0.05 to 0.3.
- the present invention proposes two solutions to achieve the above objectives:
- Scheme 1 Static threshold, but the dynamic feedback probability factor of the UE receiver is p ;
- Scheme 2 Dynamic Threshold, but the eNB should know the instantaneous BLER of each UE that feeds back the NACK and set the threshold.
- a probability factor p is set. Once the UE detects an error block, the NACK signaling in response to HARQ is fed back based on the probability factor.
- the value of the probability factor can vary depending on the UE measurement or BLER.
- the probability calculation module 414 can be utilized to set a higher probability factor p. If the UE is far away from the eNB and the measured BLER is large, a lower probability may be set.
- the detailed steps are as follows: When the UE receives the error block, when the instantaneous BLER of the UE is greater than Th-A or less than Tk-B, The UE does not feed back NACK signaling.
- the random number generating module 410 When the instantaneous BLER of the UE is between Th_A and Th_B, the random number generating module 410 generates a random number X between 0 and 1, wherein if X ⁇ p, the UE does not feed back NACK signaling; if X > p, the UE feeds back NACK signaling through the NACK feedback module 416.
- BP BP
- UE and eNB may not be able to know the total number of UEs actually receiving multicast services in the cell, ie n. If it is not known, in order to solve this problem, a method of adaptively selecting the p value is proposed.
- the UE calculates the appropriate one according to the following equation through the probability calculation module 414.
- ⁇ is the BLER measured by the current UE. Therefore, when the UE receives the error block, the UE generates a random number X between 0 and 1, where: if X ⁇ A, the UE does not feed back NACK signaling; If x>A, the UE feeds back NACK signaling.
- the UE uses the statistical total retransmission packet and adjusts /c:
- D is the number of packets transmitted during this period
- d is the data of the total retransmission packet during this period
- A is the adjustment factor, and >1.
- the eNB dynamic threshold setting module 405 sets the dynamic thresholds to Th-A and Th-B, respectively, and transmits them to the UE through the control channel. Since the eNB should know the instantaneous BLER in each UE, in the scheme, the UE not only feeds back NACK signaling, but also should simultaneously feed back the BLER in the uplink.
- the dynamic threshold scheme according to the present invention will be described below:
- the UE When the UE receives the error block, when the instantaneous BLER of the UE is greater than Tk_A or less than Th_B, the UE does not feed back NACK signaling. When the instantaneous BLER of the UE is between 73 ⁇ 4_ and 73 ⁇ 4, the UE feeds back NACK signaling in the following format:
- the eNB uses the statistics of all BLER feedback from the UE.
- the dynamic threshold does not limit the probability of eNB retransmission.
- the retransmission probability factor q in the eNB can be set, for example, ⁇ 50%, and the eNB attempts to retransmit the error transmission block based on the probability factor.
- the eNB receives NACK signaling, the eNB generates a random number x between 0 and 1, where: if x ⁇ q, the eNB retransmits the error transport block; if X >, the eNB does not retransmit the error transport block.
- the present invention proposes a method for triggering a NACK and performing retransmission in a multicast system for HARQ. Since HARQ is introduced in the multicast system, the conditional retransmission mechanism is used, thereby achieving a relatively high transmission performance and efficiency.
- the triggering of the NACK signaling is restricted by restricting the condition that the UE feeds back the NACK signaling. Therefore, the feedback signaling in the uplink channel is limited, and the retransmission probability is limited to an appropriate region in a manner similar to Rel 6 HSDPA, thereby achieving an optimum ratio of efficiency to power. Uplink overload is avoided due to the limited number of NACK signaling. At the same time, the optimal ratio of efficiency to power is achieved by limiting the probability of retransmission.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Artificial Intelligence (AREA)
- Probability & Statistics with Applications (AREA)
- Quality & Reliability (AREA)
- Multimedia (AREA)
- General Physics & Mathematics (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/674,287 US8667356B2 (en) | 2007-08-20 | 2007-08-20 | Method for triggering retransmission in a multicast system and apparatus implementing the method |
KR1020107006060A KR101342424B1 (ko) | 2007-08-20 | 2007-08-20 | 멀티캐스트 시스템에서 트리거된 반복 방법 및 장치 |
CN200780100172.4A CN101809921B (zh) | 2007-08-20 | 2007-08-20 | 多播系统中的重传触发方法及实现该方法的装置 |
PCT/CN2007/002504 WO2009023986A1 (en) | 2007-08-20 | 2007-08-20 | The method and the device for triggered repeat in the multicast system |
EP07800725A EP2182666A4 (en) | 2007-08-20 | 2007-08-20 | METHOD AND DEVICE FOR REPEATING TRIGGERED IN MULTICAST SYSTEM |
JP2010521277A JP5361888B2 (ja) | 2007-08-20 | 2007-08-20 | マルチキャスト・システムにおける再送をトリガするための方法、およびその方法を実施する装置 |
Applications Claiming Priority (1)
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PCT/CN2007/002504 WO2009023986A1 (en) | 2007-08-20 | 2007-08-20 | The method and the device for triggered repeat in the multicast system |
Publications (2)
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WO2009023986A1 true WO2009023986A1 (en) | 2009-02-26 |
WO2009023986A8 WO2009023986A8 (zh) | 2010-03-04 |
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PCT/CN2007/002504 WO2009023986A1 (en) | 2007-08-20 | 2007-08-20 | The method and the device for triggered repeat in the multicast system |
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US (1) | US8667356B2 (zh) |
EP (1) | EP2182666A4 (zh) |
JP (1) | JP5361888B2 (zh) |
KR (1) | KR101342424B1 (zh) |
CN (1) | CN101809921B (zh) |
WO (1) | WO2009023986A1 (zh) |
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JP6626846B2 (ja) | 2015-01-28 | 2019-12-25 | 京セラ株式会社 | ユーザ端末、基地局、及び方法 |
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JP6798496B2 (ja) * | 2015-09-11 | 2020-12-09 | ソニー株式会社 | 情報処理装置、通信システム、情報処理方法およびプログラム |
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CN112752295A (zh) * | 2019-10-30 | 2021-05-04 | 中国电信股份有限公司 | 支持动态harq反馈的方法、接收装置和通信系统 |
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Also Published As
Publication number | Publication date |
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US8667356B2 (en) | 2014-03-04 |
JP5361888B2 (ja) | 2013-12-04 |
WO2009023986A8 (zh) | 2010-03-04 |
CN101809921B (zh) | 2013-03-20 |
EP2182666A1 (en) | 2010-05-05 |
US20110219281A1 (en) | 2011-09-08 |
KR101342424B1 (ko) | 2013-12-17 |
KR20100063066A (ko) | 2010-06-10 |
CN101809921A (zh) | 2010-08-18 |
EP2182666A4 (en) | 2013-01-30 |
JP2010537518A (ja) | 2010-12-02 |
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