WO2009079839A1 - Procédé et appareil de gestion de la demande de répétition automatique hybride - Google Patents

Procédé et appareil de gestion de la demande de répétition automatique hybride Download PDF

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Publication number
WO2009079839A1
WO2009079839A1 PCT/CN2007/003680 CN2007003680W WO2009079839A1 WO 2009079839 A1 WO2009079839 A1 WO 2009079839A1 CN 2007003680 W CN2007003680 W CN 2007003680W WO 2009079839 A1 WO2009079839 A1 WO 2009079839A1
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WIPO (PCT)
Prior art keywords
data packet
network device
relay station
related information
hop
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PCT/CN2007/003680
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English (en)
Chinese (zh)
Inventor
Wei Ni
Kaibin Zhang
Gang Shen
Dongyao Wang
Original Assignee
Alcatel Shanghai Bell Company, Ltd.
Alcatel Lucent
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Application filed by Alcatel Shanghai Bell Company, Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Company, Ltd.
Priority to PCT/CN2007/003680 priority Critical patent/WO2009079839A1/fr
Priority to CN200780101688.0A priority patent/CN101874376B/zh
Publication of WO2009079839A1 publication Critical patent/WO2009079839A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • 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]
    • 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
    • H04L2001/0097—Relays

Definitions

  • the present invention relates to a wireless communication relay network, and more particularly to a method and apparatus for controlling hybrid automatic retransmission in a network device of a wireless communication relay network and a method and apparatus for hybrid automatic retransmission in a relay station.
  • hybrid automatic retransmission In wireless multi-hop relay networks, hybrid automatic retransmission is a relatively new field, and there is currently no mature solution. In wireless multi-hop hybrid automatic retransmission, there is no reasonable basis for the error packet to be forwarded to the next hop, which is determined only by the mechanism of hybrid automatic retransmission. In general, hybrid automatic retransmissions fall into two categories: active hybrid automatic retransmission and passive hybrid automatic retransmission. In active hybrid automatic retransmission, the relay station verifies the received data packet.
  • the packet verification result is correct before forwarding the packet to the next One jump.
  • the relay station forwards to the next hop regardless of whether the received data packet is correct.
  • the present invention proposes a new solution according to whether it is beneficial to the data obtained by the downstream network device after multiple retransmissions.
  • the quality of the packet determines whether the relay station forwards the wrong version of the packet to the downstream network device.
  • a method for controlling a relay station to perform hybrid automatic retransmission of a data packet in a network device of a wireless relay network comprising The following steps are: a. estimating, according to the channel information of the upstream and downstream channels of the relay station, that the relay station forwards the current error version of the data packet to the downstream network device, after the downlink network device passes the multiple retransmissions Obtaining the first quality related information of the data packet; and estimating, if the relay station does not forward the current error version of the data packet to the downstream network device, the downlink network device obtains after multiple retransmissions a second quality-related information of the data packet; b.
  • a quality related information is superior to the second quality related information, and the control relay station forwards the data packet to the downstream network device.
  • a method for hybrid automatic retransmission of data packets in a relay station of a wireless relay network comprising the steps of: - receiving a forwarding control message from a network device, The forwarding control message is used to notify the relay station whether to forward the wrong version of the data packet to the downstream network device; - if the forwarding control message indicates that the relay station forwards the wrong version of the data packet to the downstream network device, the packet error The version is forwarded to the downstream network device.
  • a control apparatus for controlling a relay station to perform hybrid automatic retransmission of a data packet in a network device of a wireless relay network, the control apparatus comprising an estimating means and a comparison generating means.
  • the estimating device is configured to estimate, according to channel information of the uplink and downlink channels of the relay station, that the relay station forwards the current error version of the data packet to the downstream network device, and the downlink network device performs multiple retransmissions And obtaining, by the relay station, the first quality related information of the data packet; and estimating, if the relay station does not forward the current error version of the data packet to the downstream network device, the downlink network device obtains after multiple retransmissions
  • the comparison generating means is configured to generate forwarding control information for controlling the relay station to perform the following operations by comparing the first quality related information with the second quality related information : - if the first quality related information is better than the second quality related information, the control relay station forwards the data packet to the downstream network device.
  • an automatic retransmission apparatus for performing hybrid automatic retransmission of data packets in a relay station of a wireless relay network
  • the automatic retransmission apparatus Includes receiving device and forwarding device.
  • the receiving device is configured to receive a forwarding control message from the network device, where the forwarding control message is used to notify the relay station whether to forward an incorrect version of the data packet to the downstream network device; and the forwarding device is configured to: if the forwarding control message indicates that the relay station forwards An incorrect version of the data packet to the downstream network device forwards the incorrect version of the data packet to the downstream network device.
  • the present invention determines whether the relay station forwards the wrong version of the data packet to the downstream network device according to whether it is advantageous for the quality of the data packet obtained by the downstream network device after multiple retransmissions, instead of artificially specifying whether the relay station forwards the data.
  • the wrong version of the packet to the downstream network device achieves a good compromise between the transmission delay of the packet and the packet processing load of the relay station and the downstream network device.
  • FIG. 1 is a structural block diagram of a receiver of a relay station in the prior art
  • FIG. 2 is a schematic diagram of a symbol according to 16QAM modulation at the time of demodulation
  • FIG. 3 is a schematic diagram showing the topology of a multi-hop wireless relay network according to an embodiment of the present invention.
  • FIG. 4 is a flow chart of controlling a relay station to perform hybrid automatic retransmission of a data packet in a network device of a wireless relay network according to an embodiment of the present invention
  • FIG. 5 is a block diagram showing the structure of a control apparatus 100 for controlling a relay station to perform hybrid automatic retransmission of data packets in a network device of a wireless communication network according to an embodiment of the present invention
  • FIG. 6 is a block diagram showing the structure of an automatic retransmission apparatus 200 for hybrid automatic retransmission of data packets in a relay station of a wireless relay network in accordance with an embodiment of the present invention. detailed description
  • FIG. 1 shows a receiver in a relay station.
  • the block diagram shows three ways in which packet forwarding can be taken.
  • the arrow A1 shows that the received data packet is directly re-simulated after the A/D conversion, which is a typical "amplify-forward", which has the disadvantage that the modulation mode of the data packet cannot be changed.
  • the arrow A2 indicates that the received packet is demodulated and then analog transmission is performed.
  • the arrow A3 indicates that the received packet is subjected to channel decoding or source decoding, and then analog transmission is performed.
  • the forwarding modes shown by the arrows A2 and A3 do not differ in function.
  • the data packet is analog-transmitted after remodulation, and the modulation mode can be the same as that received, or another modulation mode can be used.
  • hybrid automatic retransmission if the relay station verifies the received data packet (usually after decoding), it needs to adopt the forwarding mode shown by arrow A2 or A3.
  • the forwarding mode of the relay station is described.
  • the present invention is not limited to the OFDM or OFDMA system.
  • the symbols in the received data packet will correspond to the nearest point on the constellation in the demodulation process.
  • the quantization noise is almost negligible relative to the received interference and noise. Therefore, hereinafter, it is assumed that the quantization noise is negligible.
  • the relay stations R1 and R2 forward the wrong version of the data packet to the downstream network device, and the technical solutions adopted may be adopted.
  • the first technical solution is to consider the entire transmission link of the data packet, that is, whether the error version of the forwarded data packet is favorable to the quality of the data packet obtained by the mobile station M1 after multiple retransmissions to determine the relay station. Whether R1 and R2 forward the wrong version of the packet to the mobile station M1.
  • the second technical solution is to consider the next hop network device of the current relay station.
  • the relay station R1 it is considered whether the error version of the forwarded data packet is favorable to the quality of the data packet obtained by the relay station R2 after multiple retransmissions. It is determined whether the relay station R1 forwards the wrong version of the data packet to the relay station R2; for the relay station R2, that is, whether the error version of the forwarded data packet is favorable to the quality of the data packet obtained by the mobile station M1 after multiple retransmissions. It is determined whether the relay station R2 forwards the wrong version of the data packet to the mobile station M1. It should be noted that since the present invention discusses controlling the relay station to mix In the automatic retransmission, the technical solution of forwarding the wrong data packet to the downstream network device is convenient for presentation.
  • the first transmission of the data packet is referred to as the first retransmission of the data packet.
  • the second transmission of a packet is called the second retransmission of the packet, and so on.
  • Multiple transmissions of the same packet in a hybrid automatic retransmission are called multiple retransmissions.
  • the following is a detailed description of how to determine whether the relay stations R1 and R2 forward the incorrect version of the data packet to the mobile station M1 in the first technical solution described above. Specifically, in the first technical solution, if the relay stations R1 and R2 forward the error version of the data packet to the mobile station M1, the first quality of the data packet obtained by the mobile station M1 after multiple retransmissions of one data packet is estimated.
  • the relay stations R1 and R2 do not forward the wrong version of the data packet to the mobile station M1, estimate the second quality related information of the data packet obtained by the mobile station M1 after multiple retransmissions of one data packet, and then compare the first The quality related information and the second quality related information, if the first quality related information is superior to the second quality related information, the relay stations R1 and R2 should forward the data packet to the mobile station M1. Of course, if the first quality related information is worse than or equal to the second quality related information, the relay stations R1 and R2 do not forward the wrong version of the data packet to the mobile station ML.
  • parameters for characterizing the quality information of the data packet including parameters such as signal to noise ratio, variance of the noise term, and received signal power.
  • the first quality related information is embodied as a first signal to noise ratio or a first variance
  • the second quality related information is embodied as a second signal to noise ratio or a second variance.
  • the accumulation of received noise (including received interference and noise) during multi-hop can be as shown in equation (1).
  • ⁇ represents the transmission of useful modulation symbols
  • h and n represent the complex channel estimate and complex Gaussian white noise, respectively
  • the subscript z represents the zth transmission of the same hybrid automatic retransmission packet
  • the superscript represents the first hop . Since the current system generally only supports hybrid automatic retransmission of Chase Combining, for the sake of the single, the case of the merger is discussed here.
  • the 1-method of the description is also applicable to other merge modes such as incremental redundancy merge, and the specific combination manner is not limited to the present invention.
  • X be a useful modulation symbol sent by base station B1.
  • the symbol received by relay station R1 can be expressed as:
  • the estimated value of the symbol for the relay station R1 is expressed as:
  • the relay station R1 transmits the estimated symbol to the relay station R2, and so on, and the symbol estimation values in the respective network devices are as follows:
  • the received noise for each hop will be part of the signal sent by the next few hops as shown in equation (3).
  • the mobile station M1 performs a Chase combination on the two versions of the received data packet (the specific Information is available in the reference: Frenger. R, Parkvall S. and Dahlman E., "Performance comparison of HARQ with Chase combining and incremental redundancy for HSDPA," in Proceeding of IEEE VTC 2001 Fall, vol. 3: 1829-1833, October After 2001, Atlantic City, NJ, USA), the signal obtained is shown in equation (4):
  • the noise term is constructed by the noise of each hop and the channel estimation value. If the noise of each hop satisfies the independent and identical distribution (iid), the variance of the noise term, that is, the first variance can be expressed as:
  • ⁇ 2 represents the square of Gaussian white noise per hop Poor
  • Equation (5) can be extended to a more general form and applied to any number of hops and any number of retransmissions.
  • the expression for the first variance is shown in equation (6). It should be noted that here the relay station retransmits only the received data packets, not the combined data packets.
  • Hop_Nr represents the hop count
  • M is used to indicate the number of times the same data packet is transmitted (or retransmitted) in a hybrid automatic retransmission.
  • Equation (6) can be rewritten as Equation (7), which will be used as the basis for the selection comparison below.
  • the mobile station M1 If each relay station performs a hash combination on the received data packet, the mobile station M1 combines the received multiple versions of the same data packet, and then obtains the noise variance of the obtained data packet, that is, the first party.
  • the difference can be expressed by equation (8). Obviously, combining with formula (7) can bring certain advantages.
  • the second quality related information is assumed to be that the relay stations R1 and R2 do not forward the wrong version of the data packet to the mobile station M1, and the mobile station M1 obtains the data packet after multiple retransmissions of one data packet.
  • Quality related information Since the relay station R2 does not forward the wrong version of the data packet to the mobile station M1, that is, the relay station R2 transmits only the correct data packet to the mobile station M1. Therefore, it can be considered that the data packet sent by the relay station R2 is the same as the data packet sent by the base station B1, that is, no interference and noise are received. It is assumed that the relay station R2 receives the correct data packet when it retransmits the mth time of the same data packet. Let us be a useful modulation symbol sent by the relay station R2, and the estimated value of the symbol received by the mobile station M1 is expressed as:
  • the mobile station M1 After receiving multiple versions (i.e., M-m+1) of the same data packet from the relay station R2, the mobile station M1 combines the multiple versions and obtains the combined
  • the variance of the noise term of the packet that is, the second variance is as follows:
  • the conclusion can be drawn by comparing the formula (7) with the formula (10), and the formula (7) is directed to the case where the relay stations R1 and R2 will each The current version of the received data packet in the secondary retransmission is directly forwarded to the mobile station M1.
  • the conclusion can be drawn by comparing equation (8) with equation (10).
  • the equation (8) is for the case where the relay stations R1 and R2 will forward the current version of the data packet in each retransmission with one or more previous times.
  • One or more versions of the received data packet in the secondary retransmission are combined and then transmitted to the mobile station M1.
  • the relay station R1 if the relay station R1 forwards the error version of the data packet to the relay station R2, it estimates the first quality-related information of the data packet obtained by the relay station R2 after multiple retransmissions of the same data packet; R1 does not forward the wrong version of the data packet to the relay station R2, estimates the second quality related information of the data packet obtained by the relay station R2 after multiple retransmissions of the same data packet, and then compares the first quality related information with the second quality related information. , Such as If the first quality related information is better than the second quality related information, the relay station R1 should forward the data packet to the relay station R2. Of course, if the first shield amount related information is worse than or equal to the second quality related information, the relay station R1 does not forward the wrong version of the data packet to the relay station R2.
  • the relay station R2 For the relay station R2, if the relay station R2 forwards the wrong version of the data packet to the mobile station M1, it estimates the first quality related information of the data packet obtained by the relay station R2 after multiple retransmissions of the same data packet; if the relay station R2 does not Forwarding the wrong version of the data packet to the mobile station M1, estimating the second quality related information of the data packet obtained by the mobile station M1 after multiple retransmissions of the same data packet, and then comparing the first quality related information with the second quality related information If the first quality related information is better than the second quality related information, the relay station R2 should forward the data packet to the mobile station M1. Of course, if the first quality related information is worse than or equal to the second quality related information, the relay station R2 does not forward the wrong version of the data packet to the mobile station M1.
  • Equation (7) or (8) can be used to estimate the first variance of the data packet obtained by relay station R2 after multiple retransmissions of the same data packet.
  • the value of parameter Hop-Nr is 2 .
  • the relay station R2 it is considered whether the error version of the forwarded data packet is favorable to the quality of the data packet obtained by the mobile station M1 after multiple retransmissions to determine whether the relay station R2 forwards the wrong version of the data packet to the mobile station M1, That is, a three-hop transmission link from the base station B1 to the mobile station M1 is considered. Since in this case, the relay station R1 merges the multiple retransmission versions of the same data packet, the formula (8) can be used to estimate the mobile station M1 after multiple retransmissions of the same data packet. The obtained first variance of the data packet. At this time, the parameter Hop_Nr has a value of 3 .
  • the second shield amount related information is the quality related information of the data packet obtained after the relay station R1 does not forward the error version of the data packet to the relay station R2, and the relay station R2 obtains the multiple retransmission of one data packet. Since the relay station R1 does not forward the wrong version of the packet To the relay station R2, that is, the relay station R1 transmits only the correct data packet to the relay station R2. Therefore, it can be considered that the data packet sent by the relay station R1 is the same as the data packet sent by the base station B1, that is, no interference and noise are received. Therefore, Equation (10) can also be used to estimate the second variance of the data packet obtained by relay station R2 after multiple retransmissions of the same data packet.
  • the channel estimation value of R1 to relay station R2 is related.
  • the second quality related information is the quality information of the data packet obtained by the mobile station M1 after the repeated retransmission of one data packet by the mobile station M1 assuming that the relay station R2 does not forward the wrong version of the data packet to the mobile station M1. . Since the relay station R2 does not forward the wrong version of the data packet to the mobile station M1, that is, the relay station R2 only transmits the correct data packet to the mobile station M1, it can be considered that the data packet sent by the relay station R2 is the same as the data packet sent by the base station B1, that is, there is no Receive interference and noise. Therefore, Equation (10) can also be used to estimate the second variance of the packet obtained by relay station R2 after multiple retransmissions of the same packet.
  • the estimation of the first variance and the second variance is described in detail. It should be noted that, when the noise of each hop link is approximately the same as the thermal noise of the power, it is also possible to determine whether the relay station R1 and the relay station R2 are based on the average power of the data packets obtained by the downstream network device after multiple retransmissions. Forward the wrong version of the packet to the downstream network device.
  • the process of determining whether the relay stations R1 and R2 forward the wrong version of the data packet to the downstream network device in the process of the hybrid automatic retransmission can be performed by the base station B1, it can also be performed by the relay stations R1 and R2. It can also be executed by M1.
  • the above-mentioned judging process can also be performed by other network devices. Therefore, we use network devices to collectively refer to the devices that perform the above-mentioned judging process.
  • FIG. 4 is a flow chart showing a method for controlling a relay station to perform hybrid automatic retransmission of data packets in a network device of a wireless communication network in accordance with an embodiment of the present invention.
  • the network device is the base station B1
  • the process of controlling the hybrid automatic retransmission of the data packet by the relay station R1 and the relay station R2 in the base station B1 will be described in detail.
  • step S11 the base station B1 acquires channel information of the upstream and downstream channels of the relay stations R1 and R2.
  • step S12 the base station B1 estimates the channel information of the upstream and downstream channels of the relay stations R1 and R2 to estimate whether the relay station R1 and the relay station R2 forward the wrong version of the data packet to the downstream network device, and the downstream network device passes the multiple times.
  • the first quality related information of the data packet obtained after retransmission; and estimating that the data obtained by the downstream network device after multiple retransmissions if the relay stations R1 and R2 do not forward the wrong version of the data packet to the downstream network device The second quality related information of the package.
  • step S13 the base station B1 generates a forwarding control message by comparing the first quality related information with the second quality related information, and the forwarding control message is used to control the relay stations R1 and R2 to perform the following operations: if the first quality related information Better than the second quality related information, the control relay stations R1 and R2 forward the wrong version of the data packet to the downstream network device.
  • step S14 the base station B1 transmits a forwarding control message to the relay station R1 and the relay station R2.
  • the base station B1 can also estimate the first quality related information and the second quality related information based on predetermined values of the parameters M and m.
  • the base station B1 before each data packet is transmitted, the base station B1 obtains a required channel estimation value and parameters M and m according to the adopted technical solution, according to formulas (7) and (10). Or equations (8) and (10) determine if relay stations R1 and R2 forward the wrong version of the packet to the downstream network device.
  • the channel estimation values and m in the formulas (7), (8) and (10) are the first risk values, and may be a single prior value or an average of a plurality of prior values; M can be either a single a priori value or an average of multiple a priori values, or it can be a preset value.
  • the relay stations R1 and R2 may be pre-set to adopt a policy of not forwarding the wrong version of the data packet to the downstream network device, and then automatically retransmitting the hybrid data of one or more data packets to obtain M and m.
  • a priori value including a single prior value or multiple priors The average of the values.
  • the relay stations R1 and R2 are set to adopt the strategy of not forwarding the wrong version of the data packet to the downstream network device, and then after the automatic retransmission of one or more data packets, the a prior value of m and the M in this case are obtained.
  • the a priori value M 2 When then calculated according to equation (7), (8) and (10), the value of M is M 1 or M may be 2, or the average value M 2; M in the case where a plurality of priori 2 , the value of M can also be the statistical average of IV ⁇ or M 2 , or Statistical average.
  • the base station B1 acquires channel estimation values of one or more retransmissions of the three-hop link from the base station B1 to the mobile station M1.
  • the channel can be approximated as being stable, that is, using equations (7), (8).
  • (10) to estimate the first and second shield related information it can be approximated that the channel estimation values of multiple retransmissions per hop transmission link are the same, which greatly simplifies the calculation process.
  • the channel estimation value of the M retransmissions of the first hop link from the base station B1 to the relay station R1 may be taken in the case of the previous packet hybrid automatic retransmission.
  • the a priori value of the M channel estimation values when M times of retransmissions; the channel estimation values of the M times of retransmissions may also be regarded as the same, and a prior value is selected from the prior values of the M channel estimation values, or
  • the a priori values of the M channel estimation values are averaged or otherwise weighted to obtain a prior value which is brought into the formula (7) for calculation.
  • the base station B1 After acquiring the channel estimation value of the three-hop link from the base station B1 to the mobile station M1, the base station B1 according to the a prior value of m and the a prior value or the predetermined value of M, according to formulas (7) and (10) or formula (8) and (10) to determine the first variance and the second variance, and then generate a forwarding control message by comparing the first variance with the second variance, the forwarding control message being used to control the relay stations R1 and R2 to perform the following Operation: If the first variance is better than the second variance, the control relays R1 and R2 forward the wrong version of the packet to the downstream network device. The forwarding control message is sent to the relay stations R1 and R2. Of course, if the first and second quality related information are estimated by the relay station R1 (or the relay station R2) itself, there is no need to forward the control. Send a message to yourself.
  • the relay station R1 (or the relay station R2), in the hybrid automatic retransmission of the data packet, the relay station R1 (or the relay station R2) also receives the data from the base station B1 before or at the same time as each new data packet is forwarded.
  • a packet-related forwarding control message the forwarding control message is used to notify the relay station R1 (or the relay station R2) whether to forward the wrong version of the data packet to the downstream network device; if the forwarding control message instructs the relay station R1 (or the relay station R2) to forward the data packet The wrong version is forwarded to the downstream network device, and the wrong version of the data packet is forwarded to the downstream network device. Thereafter, during the retransmission of the data packet, the relay station R1 (or the relay station R2) directly instructs the forwarding control message Forwarding strategy.
  • the wrong version of the forwarded data packet is the currently received version; if base station B1 calculates the first variance using equation (8) , the relay station R1 (or relay station R2) in the second or subsequent retransmission of the same data packet, the wrong version of the forwarded data packet is the currently received version and the previous one or more retransmissions (including The first transmission) the version received after the merged version.
  • the base station B1 acquires channel estimation values of one or more retransmissions of the two-hop link from the base station B1 to the relay station R2, and then according to the a prior value of m and the a priori value or reservation of M a value, in the formulas (8) and (10) to determine the first variance and the second variance, and then generate a forwarding control message by comparing the first variance with the second variance, the forwarding control message being used to control the relay station R1 to execute The following operation: If the first variance is better than the second variance, the control relay station R1 forwards the error version of the data packet to the relay station R2; and transmits the forwarding control message to the relay station R1.
  • the channel estimation values of each hop link and the values of M and m are the same as described above.
  • the relay station R1 in the hybrid automatic retransmission of the data packet, before or at the same time of forwarding each new data packet, the relay station R1 also receives a forwarding control message related to the data packet from the base station B1. , the forwarding control message is used in the notification Whether the relay R1 transfers the wrong version of the data packet to the relay station R2; if the forwarding control message instructs the relay station R1 to forward the incorrect version of the data packet to the relay station R2, the relay station R1 forwards the incorrect version of the data packet to the relay station R2, and thereafter, During the retransmission of the data packet, the relay station R1 directly adopts the forwarding policy indicated by the forwarding control message.
  • the relay station R1 since the base station B1 calculates the first variance using the formula (8), the relay station R1 is in the second or subsequent retransmission of the same data packet, and the wrong version of the forwarded data packet is the currently received version and before. The version after the merged version of the one or more retransmissions is merged.
  • the network device acquires a channel estimation value of one or more retransmissions of the three-mega link from the base station B1 to the mobile station M1, and then according to the a prior value of m and the a prior value or the predetermined value of M, according to Equations (8) and (10) determine the first variance and the second variance, and then generate a forwarding control message by comparing the first variance with the second variance, the forwarding control message being used to control the relay station R2 to perform the following operations: If the first variance is better than the second variance, the control relay station R2 forwards the incorrect version of the data packet to the mobile station M1; and transmits the forwarding control message to the relay station R2.
  • the channel estimation values of each hop link and the values of M and m are the same as described above.
  • the relay station R2 in the hybrid automatic retransmission of the data packet, before or at the same time of forwarding each new data packet, the relay station R2 also receives a forwarding control message related to the data packet from the base station B1.
  • the forwarding control message is used to notify the relay station R2 whether to transfer the wrong version of the data packet to the mobile station M1; if the forwarding control message instructs the relay station R2 to forward the wrong version of the data packet to the mobile station M1, the relay station R2 errors the data packet.
  • the version is forwarded to the mobile station M1, and thereafter, during the retransmission of the data packet, the relay station R2 uses the forwarding policy indicated by the forwarding control message.
  • the relay station R2 since the base station B1 calculates the first variance using the formula (8), the relay station R2 is in the second or subsequent retransmission of the same data packet, and the wrong version of the forwarded data packet is the currently received version and before. The version after the merged version of the one or more retransmissions is merged.
  • the first quality related information and the second quality are The estimation of relevant information can be done in a distributed manner. Specifically, the first quality related information and the second quality related information of the data packet obtained by the relay station R2 after multiple retransmissions of the same data packet are estimated by the relay station R1, and the first quality related information and the second information are compared.
  • the relay station R2 estimates the first quality related information and the second shield related information of the data packet obtained by the mobile station M1 after multiple retransmissions of the same data packet And determining the forwarding policy of the incorrect version of the packet by comparing the first quality related information with the second quality related information. This eliminates the need to send forwarding control messages to other relay stations.
  • the above quantitative analysis of the first quality related information and the second quality related information is quantitatively analyzed.
  • equations (7), (8) and (9) it can be seen that for the first technical solution, if the channel information of the last hop on the packet transmission link is compared with the channel information of other hops. If the difference, for example, the amplitude value of the channel estimate of the last hop is smaller than the amplitude value of the channel estimate of the other hops, it can be approximated that the relay stations R1 and R2 forward the erroneous version of the data packet to the mobile station M1 to be more advantageous to the mobile station M1.
  • a high quality packet is obtained after multiple retransmissions of the same packet.
  • the relay stations R1 and R2 do not forward the wrong version of the data packet to the mobile station M1, which is more advantageous for the mobile station M1 to obtain the high quality data packet after multiple retransmissions of the same data packet.
  • the relay station R1 if the channel information between the relay station R1 and the relay station R2 is worse than the channel information between the base station B1 and the relay station R1, the relay station R1 can be approximately considered to forward data.
  • the error version of the packet to the relay station R2 is more advantageous for the relay station R2 to obtain the high quality data packet after multiple retransmissions of the same data packet; if the channel information between the relay station R1 and the relay station R2 is worse than the base station B1 to the relay station R1 Between the channel information, it can be approximated that the relay station R1 does not forward the wrong version of the data packet to the relay station R2, which is more advantageous for the relay station R2 to obtain the high quality data packet after multiple retransmissions of the same data packet.
  • the relay station R2 For the relay station R2, if the channel information between the relay station R2 and the mobile station M1 is worse than the base station B1 to the relay station The channel information between R2 can be approximated that the relay station R2 forwards the wrong version of the data packet to the mobile station M1, which is more advantageous for the mobile station M1 to obtain the high quality data packet after multiple retransmissions of the same data packet; If the channel information between the relay station R2 and the mobile station M1 is worse than the channel information between the base station B1 and the relay station R2, it can be approximated that the relay station R2 does not forward the wrong version of the data packet to the mobile station M1, which is more advantageous for the mobile station M1. A high quality packet is obtained after multiple retransmissions of a data packet.
  • the base station B1 does not need to know the predetermined values of M and m, thereby directly determining the forwarding policy for the relay stations R1 and R1 based on the channel information of each hop link and generating a forwarding control message to the relay stations R1 and R2.
  • the channel information herein includes other parameters such as a channel estimation value reflecting the channel condition or a variation of the channel estimation value, such as the amplitude, phase, delay of the channel estimation value, and time-varying or time-invariant characteristics of the channel.
  • the base station B1 can reacquire the channel information of the upstream and downstream channels related to the relay stations R1 and R2, and determine whether to forward the relay stations R1 and R2. The wrong version of the packet to the downstream network device.
  • the channel of each hop link of the wireless relay network is relatively stable for a period of time (for example, one hour), that is, the channel information of each hop link obtained by the base station B1 is basically the same, so During a period of time, relay stations R1 and R2 can adopt the same forwarding policy when forwarding multiple different data packets. That is, for each data packet, the base station B1 can determine the forwarding policy of the incorrect version of the data packet for the relay stations R1 and R2 based on the uplink and downlink related channel information of the pre-stored relay stations R1 and R2. That is, the base station B1 does not need to reacquire the channel information of each hop link for each new data packet sent by it, and therefore, step S11 is not a necessary step of the present invention.
  • FIG. 5 is a block diagram showing the structure of a control apparatus 100 for controlling a relay station to perform hybrid automatic retransmission of a data packet in a network device of a wireless communication network according to an embodiment of the present invention.
  • the control device 100 includes an acquisition device 101, an estimation device 102, a comparison generation device 103, and a transmission device 104.
  • Those skilled in the art will appreciate from the teachings of the present specification that only the estimating device 102 and the comparing generating device 103 are necessary to implement the present invention, and the obtaining device 101 and the transmitting device 104 are optional devices.
  • the downlink transmission of the network topology shown in FIG. 3 is taken as an example, and the process in which the control device 100 in the network device controls the relay station R1 and the relay station 2 to perform hybrid automatic retransmission of the data packet will be described in detail. Also consider the two technical solutions mentioned above.
  • the data packet obtained by the mobile station M1 after repeated retransmissions includes the data packet after the mobile station M1 merges the plurality of versions of the data packet received in the multiple retransmissions (for example, the Chase merge).
  • the estimating means 102 estimates the relay station R1 based on the channel information of the upstream and downstream channels of the relay stations R1 and R2, that is, the channel information of the three-hop transmission link from the base station B1 to the mobile station M1. And R2, if the error version of the data packet is forwarded to the mobile station M1, the mobile station M1 obtains the first quality related information of the data packet obtained after multiple retransmissions; and estimates that the relay stations R1 and R2 do not forward the data packet. When the error version is to the mobile station M1, the mobile station M1 obtains the second quality related information of the data packet obtained after multiple retransmissions.
  • the comparison generating means 103 compares the first quality related information with the second quality related information, and generates a forwarding control message for controlling the relay stations R1 and R2 to perform the following operations: if the first quality related information is superior to the second quality Related information, the control relay stations R1 and R2 forward the wrong version of the data packet to the mobile station M1. Of course, if the first quality related information is worse than or equal to the second quality related information, the relay stations R1 and R2 need not forward the wrong version of the data packet to the mobile station M1.
  • the channel information includes other parameters such as a channel estimation value reflecting the channel condition or a variation of the channel estimation value.
  • the transmitting device 104 transmits a forwarding control message to the relay station R1 and the relay station R2.
  • the network device is the relay station R1 (or the relay station R2), there is no need to send a forwarding control message to itself.
  • the obtaining means 101 acquires channel information of the three-hop transmission link of the base station B1 to the mobile station M1.
  • the obtaining means 101 acquires channel information of the three-hop transmission link of the base station B1 to the mobile station M1.
  • the channel information acquired when the previous data packet is stored in the network device can be directly used.
  • the first and second quality related information of the data packet include a variance, a signal to noise ratio, and the like, a parameter reflecting the quality.
  • the estimation device 102 combines the predetermined number of retransmissions M of each new data packet, the a priori value of the correct version of the data packet received by the relay station R2 at the mth retransmission, and the base station B1 to the mobile station M1.
  • the channel estimation values of the hop transmission link are used to estimate the first and second quality related information.
  • the channel estimation values of m and M and each hop link are as described above.
  • the first quality related information includes a first variance
  • the second quality related information includes a second variance
  • the estimating device 102 further combines the predetermined number of retransmissions M of each new data packet with the base station B1 to the mobile station M1.
  • the channel estimate of the three-hop transmission link estimates the first variance according to equation (7) or equation (8).
  • Equation (7) is applicable to the relay station R1 and the relay station R2 to directly forward the incorrect version of the received data packet to the mobile station M1;
  • the formula (8) is applicable to the version of the data packet received by the relay station R1 and the relay station R2 when retransmitting
  • the version obtained after the version of the packet received in the previous one or more retransmissions is merged is sent to the mobile station M1.
  • the estimation device 102 combines the predetermined number of retransmissions M of the data packet with the a priori value of m when the relay station R2 receives the correct version of the data packet at the mth retransmission, according to the channel estimation value of the relay station R2 to the mobile station M1. And formula (10) determines the second variance.
  • m is less than or equal to M.
  • the comparison generating means 103 generates the above-mentioned forwarding control message by comparing the first variance and the second variance, the forwarding control message is used to control the relay stations R1 and R2 to perform the following operations: if the first variance value is smaller than the second variance value , The control relay stations R1 and R2 forward the wrong version of the data packet to the mobile station M1.
  • the relay station R1 considering the next hop network device of the current relay station, it is considered for the relay station R1 whether the error version of the forwarded data packet is favorable for the quality of the data packet obtained by the relay station R2 after multiple retransmissions.
  • the merits and demerits determine whether the relay station R1 forwards the wrong version of the data packet to the relay station R2; for the relay station 2, that is, whether the error version of the forwarded data packet is favorable for the quality of the data packet obtained by the mobile station M1 after multiple retransmissions. Good or bad It is determined whether the relay station R2 forwards the wrong version of the data packet to the mobile station M1. At this time, a case where the relay station R1 and the relay station R2 merge the received multiple versions of the same data packet is considered.
  • the estimating means 102 estimates the first shield amount related information only based on the channel information of the base station B1 to the relay station R2.
  • the first variance is determined according to equation (8).
  • the estimating means 102 estimates the second quality related information based on the channel information of the relay stations R1 to R2, and preferably determines the second variance according to the formula (10).
  • the channel estimation values of m and M and each hop link are as described above.
  • the estimating means 102 estimates the first quality related information based on the channel information of the base station B1 to the mobile station M1.
  • the first variance is determined according to equation (8).
  • FIG. 6 is a block diagram showing the structure of an automatic retransmission apparatus 200 for hybrid automatic retransmission of data packets in a relay station of a wireless relay network in accordance with an embodiment of the present invention.
  • the automatic repeater 200 includes a receiving device 201 and a forwarding device 202.
  • the following takes the network topology shown in FIG. 3 as an example to describe the process of hybrid automatic retransmission of data packets by the automatic retransmission device 200 located in the relay station R1.
  • the receiving device 201 receives a forwarding control message from the network device, the forwarding control message being used to notify the relay station R1 whether to forward the wrong version of the data packet to the downstream network device.
  • the forwarding device 202 forwards the erroneous version of the data packet to the downstream network device.
  • the network device estimates the first shield related information of the data packet obtained by the downstream network device after multiple retransmissions of the same data packet according to formula (7), the network device further needs to indicate that the relay station R1 will each The version of the packet received in the secondary retransmission (or in transit) is forwarded directly to the downstream network device. If the network device comes according to formula (8) Estimating the first quality related information of the data packet obtained by the downstream network device after multiple retransmissions of the same data packet, the network device also needs to instruct the relay station R1 to receive the current version of the data packet after retransmission and the front The one or more retransmitted versions are merged and forwarded to the downstream network device.
  • the network device uses the formula (7) or the formula (8) to estimate the first quality related information of the data packet obtained by the downstream network device of the relay station after multiple retransmissions of the same data packet, it may be preset. Whether the relay station R1 merges the received multiple versions of the same data packet.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé permettant de commander à une station relais d'exécuter une demande HARQ sur datagramme dans un dispositif de réseau appartenant à un réseau de relais radio. Ce procédé comporte plusieurs étapes. Dans un premier temps, on se base sur l'information canal des canaux ascendants et descendants de la station relais pour évaluer une première information se rapportant à la qualité et concernant le datagramme obtenu par le dispositif de réseau descendant après plusieurs retransmissions au cas où la station relais achemine une version en erreur du datagramme à destination du disposition de réseau descendant, puis pour évaluer une seconde information se rapportant à la qualité et concernant le datagramme obtenu par le dispositif de réseau descendant après plusieurs retransmissions au cas où la station relai n'achemine pas la version en erreur du datagramme à destinations du dispositif de réseau descendant (S12). Dans un deuxième temps, on génère une information de commande d'acheminement par comparaison entre la première et la seconde information se rapportant à la qualité de façon à commander à la station relais d'acheminer au dispositif réseau descendant (S13) la version en erreur du datagramme lorsque la première information se rapportant à la qualité est meilleure que la seconde information se rapportant à la qualité. L'invention concerne également un contrôleur de mise en œuvre du procédé comportant une logique d'évaluation et un générateur de comparaison. L'invention concerne enfin un procédé et un appareil permettant l'exécution de la demande HARQ de datagramme dans la station relais du réseau de relais radio.
PCT/CN2007/003680 2007-12-19 2007-12-19 Procédé et appareil de gestion de la demande de répétition automatique hybride WO2009079839A1 (fr)

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CN200780101688.0A CN101874376B (zh) 2007-12-19 2007-12-19 用于控制混合自动重传的方法及装置

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CN1471776A (zh) * 2000-10-27 2004-01-28 ����ɭ�绰�ɷ����޹�˾ 用于在多跳网络中转发的方法
CN1897576A (zh) * 2005-07-14 2007-01-17 三星电子株式会社 为无线通信系统中的下行链路中继数据包的方法
CN101047431A (zh) * 2006-06-22 2007-10-03 华为技术有限公司 在含有中继站的通信系统中实现混合自动重传的方法

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CN1471776A (zh) * 2000-10-27 2004-01-28 ����ɭ�绰�ɷ����޹�˾ 用于在多跳网络中转发的方法
CN1897576A (zh) * 2005-07-14 2007-01-17 三星电子株式会社 为无线通信系统中的下行链路中继数据包的方法
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