WO2018007813A1 - Transmission de paquets de données entre des nœuds de réseau - Google Patents

Transmission de paquets de données entre des nœuds de réseau Download PDF

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Publication number
WO2018007813A1
WO2018007813A1 PCT/GB2017/051984 GB2017051984W WO2018007813A1 WO 2018007813 A1 WO2018007813 A1 WO 2018007813A1 GB 2017051984 W GB2017051984 W GB 2017051984W WO 2018007813 A1 WO2018007813 A1 WO 2018007813A1
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WO
WIPO (PCT)
Prior art keywords
data
data packet
packet
radio path
forward error
Prior art date
Application number
PCT/GB2017/051984
Other languages
English (en)
Inventor
Abdol Hamid Aghvami
Adnan Aijaz
Mischa Dohler
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King's College London
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 King's College London filed Critical King's College London
Publication of WO2018007813A1 publication Critical patent/WO2018007813A1/fr

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    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to a method of transmitting data packets between network nodes in a wireless communication network utilising a forward error correction data encoding protocol, a method of decoding such transmitted data packets, computer program products and a network nodes configured to perform those methods.
  • Wireless communication systems are known.
  • a range of wireless communication systems are known, each operating according to various agreed specifications or combinations thereof.
  • Such systems include, for example, Wi-Fi systems, ZigBee systems and wireless telecommunication networks operating according to 3GPP standards.
  • data packets are sent and received between network nodes.
  • radio coverage is provided to network connectable devices, such as user equipment, by regions of geographical area. That radio coverage may typically be provided by means of a radio coverage network comprising one or more network nodes known as base stations.
  • Network connectable devices located in a geographical area served by a base station are typically configured to receive information and data from that base station and transmit data and information to that base station. Similar data and information transfer occurs between network nodes in other wired and wireless communication networks.
  • Data and information may be communicated between network nodes using various transmission and reception methods which may prioritise data transfer rate, minimise errors in data packets or a combination thereof. It is desired to provide an alternative data transmission method.
  • a first aspect provides a method of transmitting data packets between network nodes in a wireless communication network utilising a forward error correction data encoding protocol; the method comprising the steps of: encoding a packet of original data using forward error correction to form: a first data packet comprising: an indication of the original data and an error detection check; and a second data packet comprising:
  • forward error correcting code associated with the original data in the first data packet transmitting at least the first data packet to a receiving network node using a first radio path; and transmitting at least the second data packet to the receiving network node using a second radio path.
  • the first aspect recognises that data transmission between network nodes in, for example, a wireless telecommunications network, may utilise techniques which may operate to introduce a delay or jitter into a data flow.
  • Techniques typically used for data transmission between network nodes include, for example, Hybrid Automatic
  • HARQ Repeat Request
  • the first aspect recognises that in many wireless communication networks more than one path, for example, radio path, may be available between a transmitting network node and a receiving network node.
  • a wireless telecommunication network for example, base stations and network connectable devices may be equipped with transceivers configured to operate using more than one radio frequency or more than one radio channel simultaneously.
  • MIMO multiple-input and multiple-output
  • some implementations of the first aspect may allow for the different paths taken by the first packet and second packet to comprise different MIMO paths.
  • the first aspect seeks to utilise such equipment functionality to provide a data transmission method which can offer reliability and may mitigate delay in data transfer.
  • the transmitting node may be a network connectable device, such as user equipment, and the receiving node may be a base station, eNodeB, Wifi access point or similar. Similarly, in some embodiments, the transmitting node may be a base station, eNodeB, Wifi access point or similar, and the receiving node may be a network connectable device, such as user equipment. It will also be appreciated that the first aspect may be of use in both infrastructure based networks, and infrastructureless networks. In an infrastructureless network, the transmitting and receiving network nodes may comprise nodes of the same basic type.
  • a first aspect may provide a method of transmitting data packets between network nodes in a wireless communication network utilising a forward error correction data encoding protocol.
  • the network nodes may comprise two nodes in, for example, a Wi-Fi network, ZigBee network or similar, or may comprise a base station and one or more user equipment, or user equipment and one or more base stations in a wireless telecommunications network.
  • the forward error correction (FEC) data encoding scheme may comprise any suitable FEC scheme, selected in accordance with intended application.
  • the method may comprise the steps of: encoding a packet of original data using forward error correction to form: a first data packet comprising: an indication of the original data and an error detection check; and a second data packet comprising:
  • a transmitting node may be configured to encode the original data, or portion thereof, in a redundant way by using an error-correcting code.
  • the redundancy may allow a receiving node to detect and correct common errors in the encoded original data without a need for retransmission by the transmitting network node.
  • use of FEC techniques can give a receiving node an ability to correct errors without needing a reverse channel to request retransmission of the data. That FEC ability comes with an associated cost comprising a fixed, higher forward channel bandwidth.
  • the second data packet comprising forward error correcting code parity bits associated with the original data in the first data packet is of comparable size to the first data packet.
  • the error detection check in the first data packet may comprise error detection check bits.
  • the method may comprise transmitting the first data packet to a receiving network node using a first radio path ; and transmitting the second data packet to the receiving network node using a second radio path. Accordingly, by using different radio paths between a first and second network node, it is possible to provide a Hybrid FEC data transmission regime.
  • the first and second data packets may be transmitted
  • the first aspect provides an alternative technique to HARQ which uses a combination of FEC and path and/ or frequency diversity which can provide a data transmission regime in which it is possible to achieve little or no delay. Arrangements provide a Hybrid Forward Error Correcting (HFEC) data transmission regime.
  • HFEC Hybrid Forward Error Correcting
  • Techniques according to the first aspect combine path and/ or frequency diversity with error detection and FEC techniques and, at least in some embodiments, may not rely upon retransmission (time diversity) as a means to introduce diversity.
  • the first radio path and the second radio path are uncorrelated. Accordingly, it will be understood that, for example, the first data packet, containing the encoded data and error detection may be transmitted using a radio channel which is experiencing good conditions between the first network node and second network node. If so, there may be no need for the parity bits contained in the second data packet, sent via a different path. That different path may itself be a radio channel which is experiencing good (or bad) conditions between the first network node and second network node. If the first data packet is determined by the receiving network node to contain errors, the receiving network node may use the forward error correction parity bits contained in the second data packet, which has been sent via a different path. Since the parity bits were sent to the receiving node via a different path, the second packet may be better received than the first packet, thus the forward error correction parity bits may be well received and allow the receiving node to effectively perform forward error correction of the encoded data contained in packet 1.
  • the path taken by the first and second packets from a transmitting node to a receiving node differs. That path difference may occur as a result of spatial path diversity, frequency diversity or both.
  • the path diversity may occur as a result of multiple transceivers provided at transmitting and receiving nodes.
  • the first radio path and the second radio path comprise different radio channels.
  • the first radio path and the second radio path comprise different radio frequencies.
  • a path diversity may occur as a result of one of the first and/ or second packets being received at a further receiving node and being passed or communicated to an intended receiving node via appropriate signalling, communication or connection within a given network. For example, in an LTE network, X2 interface between eNodeB network nodes.
  • only the first data packet is transmitted using the first radio path.
  • only the second data packet is transmitted using the second radio path. Accordingly, whilst it may be possible to send both first and secon packets together on each of the first and second radio paths between two nodes, such an arrangement is not an efficient use of available bandwidth. Therefore splitting an original data packet encoded using FEC techniques into the first and second data packets and sending those first and second data packets separately on different radio paths may allow for more reliable data transfer by allowing for the use of different radio paths without a significant change in overall required bandwidth.
  • the first data packet is transmitted using the first radio path and a further radio path.
  • the second data packet is transmitted using the second radio path and a further radio path.
  • the further radio path comprises a third radio path. Accordingly, by increasing path diversity, reliability of data transfer may be improved, albeit at the cost of overall used bandwidth.
  • the first data packet may be transmitted on a plurality of radio paths.
  • the second data packet may be transmitted on a plurality of radio paths.
  • the first data packet and the second data packet are not transmitted on using the same radio paths. That is to say, no radio path exists on which both the first and second data packets are sent together.
  • the communication network comprises a multi-channel wireless communication network. In some embodiments, the communication network comprises a MIMO wireless communication network.
  • the original data comprises: haptic data.
  • the original data comprises: control data. It will be appreciated that techniques according to the first aspect may have particular application where it is important to avoid end to end time delay in relation to data transfer. Examples of such data include haptic signals and control data.
  • a second aspect provides a computer program product operable, when executed on a computer, to perform the method steps of the first aspect.
  • a third aspect provides a network node configured to transmit data packets to other network nodes in a wireless communication network utilising a forward error correction data encoding protocol; the network node comprising: encoding logic configured to encode a packet of original data using forward error correction to form : a first data packet comprising: an indication of the original data and an error detection check; and a second data packet comprising: forward error correcting code parity bits associated with the original data in the first data packet; transmission logic configured to transmit the first data packet to a receiving network node using a first radio path; and the second data packet to the receiving network node using a second radio path.
  • the first radio path and the second radio path selected by the transmission logic are uncorrelated.
  • the first radio path and the second radio path selected by the transmission logic comprise different radio channels.
  • only the first data packet is transmitted using the first radio path. In some embodiments, only the second data packet is transmitted using the second radio path.
  • the first data packet is transmitted using the first radio path and a further radio path.
  • the second data packet is transmitted using the second radio path and a further radio path.
  • the further radio path comprises a third radio path.
  • the communication network comprises a multi-channel wireless communication network.
  • the original data comprises: haptic data.
  • a fourth aspect provides a method of decoding data packets transmitted between network nodes in a wireless communication network utilising a forward error correction data encoding protocol in which a packet of original data is encoded using forward error correction to form a first data packet comprising: an indication of original data and an error detection check and a second data packet comprising:
  • the decoding method comprising the steps of: receiving, via a first radio path, the first data packet; and receiving, via a second radio path, the second data packet; checking the original data in the first data packet against the error detection check in the first data packet and if no error is detected, decoding the original data; if an error is detected, using the forward error correcting code parity bits from the second data packet in relation to the original data in the first data packet to decode the original data and, once decoded, rechecking the original data from the first data packet against the error detection check in the first data packet.
  • a reception method for receiving and decoding data transmitted using a method in accordance with the first aspect is provided. It will be appreciated that features provided in relation to a transmission and encoding regime in accordance with the first aspect may be appropriately reflected in the analogous reception and decoding regime as appropriate.
  • a fifth aspect provides a computer program product operable, when executed on a computer, to perform the method of the fourth aspect.
  • a sixth aspect provides a network node configured to decode data packets transmitted between network nodes in a wireless communication network utilising a forward error correction data encoding protocol in which a packet of original data is encoded using forward error correction to form: a first data packet comprising: an indication of original data and an error detection check and a second data packet comprising:
  • the network node comprising: reception logic configured to receive the first data packet via a first radio path ; and the second data packet via a second radio path; check logic configured to check the original data in the first data packet against the error detection check in the first data packet and if no error is detected, decode the original data; and correction logic configured, if an error is detected, to use the forward error correcting code parity bits from the second data packet in relation to the original data in the first data packet to decode the original data and, once decoded, recheck the original data from the first data packet against the error detection check in the first data packet.
  • Figure 1 illustrates schematically a data transmission acknowledgement protocol used in a data transmission regime of a wireless communication network
  • Figure 2 illustrates schematically a data transmission regime using the data
  • FIG 3 illustrates schematically main components of a data packet in accordance with a typical data transmission acknowledgement protocol such as that shown in Figures 1 and 2;
  • Figure 4 illustrates schematically data packets for use in one data transmission scheme
  • Figure 5 illustrates schematically a data transmission regime according to one arrangement using the data packets shown in Figure 4;
  • Figure 6 illustrates schematically a data transmission regime according to one arrangement using the data packets shown in Figure 4.
  • Figure 1 illustrates schematically main features of a data transmission
  • Figure 1 illustrates schematically transmission of a data block Bl as a data packet from network node 1 to network node 2 and the operation of an
  • ARQ Automatic Repeat Request
  • HARQ acknowledgement protocol
  • Figures 1 and 2 The operation of the Automatic Repeat Request (ARQ) aspect of HARQ is illustrated schematically in Figures 1 and 2.
  • a first data packet Bl is transmitted from network node 1 and successfully received by network node 2.
  • the second network node in accordance with the ARQ process, sends an acknowledgement of safe receipt (ACK) of Bl back to network node 1.
  • Figure 1 illustrates a "stop and wait" ARQ protocol in which network node 1 is configured to wait for acknowledgement of safe receipt of a data packet before sending the next.
  • a successful receipt is received from network node 2 at network node 1 in respect of Bl, within a pre-programmed monitoring period, and network node 1 is configures to then transmit a second data packet, B2.
  • the monitoring period in the case shown in Figure 1 is labelled as the time to perform an ARQ process, and relates to the round trip time for a data packet to be received and acknowledged by network node 2.
  • NACK negative acknowledgement
  • Figure 2 illustrates schematically a data transmission regime using the data
  • a first network node Whilst waiting for an ACK or NACK from a second network node in respect of a given data packet, a first network node is configured to transmit further data packets. The second network node can also monitor for successful receipt or otherwise of those data packets and it will thus be understood that there are in the example shown in Figure 2, at most, 8 simultaneous ARQ processes occurring at any given time.
  • the HARQ protocol used in wireless networks provides a mechanism to transmit data which combines Forward Error Correction (FEC) and the automatic repeat request (ARQ) error control process illustrated in Figures 1 and 2. That is to say, HARQ typically provides a data transmission regime which combines FEC with time diversity (repetition).
  • FEC Forward Error Correction
  • ARQ automatic repeat request
  • the data packets (Bl, B2 etc) according to a ARQ transmission protocol such as that shown in Figures 1 and 2 typically comprise a block of original data which has been encoded with a forward error correction (FEC) code, a parity check bit and parity bits.
  • the parity bits may be transmitted together with the block of encoded original data or may be transmitted upon request when a receiving network node detects an erroneous message.
  • FEC forward error correction
  • the ARQ is used as a fall-back to allow for correction of errors which cannot be corrected using only the redundancy (parity bits) sent in the initial transmission.
  • typical hybrid ARQ performs better than ordinary ARQ in poor signal conditions.
  • ARQ just repeat requests
  • FIG 3 illustrates schematically main components of one example data packet in accordance with a typical HARQ data transmission method.
  • a data packet Bl 10 comprises encoded original data 20 with a parity check 30 , which together form a data portion 40 of the data packet.
  • the data packet 10 may also comprise FEC parity bits 50. It will be appreciated that the FEC portion of the data packet 10 is typically comparable in size to the data portion 40 of the data packet.
  • the techniques Whilst the use of a standard HARQ data transmission protocol can be useful to increase reliability of connectivity between network nodes, the techniques are based upon use of a time diversity gain. However it will be appreciated that, because of retransmission nature of this technique, it introduces delay. Hence the use of a standard HARQ regime may increase end-to-end delay which may mean that the techniques are not well-suited to the demands of real-time data traffic such as that which is of use in haptic and other control signals within a network.
  • Arrangements provide an alternative technique to HARQ which uses a combination of FEC and path and/ or frequency diversity which can provide a data transmission regime in which it is possible to achieve little or no delay. Arrangements provide a Hybrid Error Control HEC data transmission regime.
  • HARQ uses a hybrid of FEC and ARQ.
  • HFEC techniques according to described arrangements combine path and/ or frequency diversity with error detection and FEC techniques and, at least in some arrangements, do not rely upon retransmission (time diversity) as a means to introduce diversity.
  • Figure 4 illustrates schematically data packets for use in one data transmission scheme arrangement.
  • a first data packet 100 comprises a block of Cyclic Redundancy Check (CRC) bits 130 provided for the purposes of error detection.
  • CRC Cyclic Redundancy Check
  • the first data packet 100 comprises an encoded data block 210.
  • the first data packet 100 is sent between network nodes using a first radio link (path 1).
  • a second data packet 200 comprises parity bits of FEC 250 for the data 120 included in the first data packet 100.
  • the second data packet 200 is transmitted between network nodes via another radio link (path 2). It is assumed that that the two paths are uncorrelated.
  • Figure 5 illustrates schematically a data transmission regime according to one arrangement using the data packets shown in Figure 4.
  • data is encoded using forward error correction techniques and a traditional data packet similar to that shown in Figure 3 is "split" into two data packets as shown in Figure 4.
  • a first data packet comprises the encoded data and a parity check (error detection bit)
  • the second data packet comprises error correcting code (parity bits).
  • the first and second data packets are transmitted by at least one first network node, in this case user equipment, to at least one second network node, in this example, an eNodeB in a wireless communication network.
  • the receiving network node may be configured to first use the CRC 130 to detect data errors in the encoded data 120 sent in data packet 100 by the first network node via path 1. If the data errors are detected, the receiving network node may then use the parity bits received in data packet 200 , sent by network node 1 to network node 2 via path 2, to correct data errors. Finally, the receiving network node may be configured to check whether any error remain in the encoded data 120 using the CRC 130.
  • the first data packet, containing the encoded data and error detection may be transmitted using a radio channel which is
  • the receiving network node may use the forward error correction parity bits contained in the second data packet, sent via a different path. Since the parity bits were sent to the receiving node via a different path, that path may be better received than the first packet and thus the forward error correction parity bits may be well received and thus allow the receiving node to effectively perform forward error correction of the encoded data of packet 1.
  • Alternative arrangements may allow for use of more than two paths on which the data packets 1 and 2 are simultaneously transmitted. Such an arrangement may further enhance reliability.
  • Figure 6 illustrates schematically a data transmission regime according to one arrangement using the data packets shown in Figure 4.
  • data is encoded using forward error correction techniques and a traditional data packet similar to that shown in Figure 3 is "split" into two data packets as shown in Figure 4.
  • a first data packet comprises the encoded data and a parity check (error detection bit)
  • the second data packet comprises error correcting code (parity bits).
  • the first and second data packets are transmitted by a first network node (in this example, user equipment) with the intention that they are to be communicated to a second network node (an eNodeB).
  • the first and second data packets in the arrangement shown schematically in Figure 6, may be transmitted to the second network node using different, uncorrelated, radio paths.
  • the first packet may be sent via radio path 1, and for the second packet to be sent via paths 2, 3 and 4.
  • the first data packet may be transmitted using paths 1 and 3 and the second data packet via paths 2 and 4.
  • some arrangements provide for the first packet to be sent via, for example, paths 1 to 3 and packet 2 via path 4.
  • the first data packet is sent via at least one different radio path to the second data packet.
  • the second packet may be sent via at least one different path to the first data packet. Where a plurality of paths is available, the proportion of paths used to transmit the first data packet compared to the second may be
  • a receiving network node may operate to look at each of those packets individually to see whether one was successfully received before turning to the second packet containing FEC parity bits. In some arrangements, the receiving network node may combine first data packets to see whether they can be successfully decoded before turning to a second data packet containing FEC parity bits. Similarly, it is possible to use second packets containing FEC parity bits individually, or a plurality of second packets may be combined before use by a receiving network node. As shown schematically in Figure 6, the different radio paths may comprise different physical paths (ie between different antennae) different radio channels, different frequencies, or may comprise a route between two network nodes via a third network node. Arrangements recognise that it is possible within a wireless network to achieve reliable data transmission without increasing delay and jitter. Arrangements may provide a replacement for hybrid ARQ data transmission methods, or may, in some

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

Des aspects et des modes de réalisation de l'invention concernent un procédé de transmission de paquets de données entre des nœuds de réseau dans un réseau de communications sans fil utilisant un protocole d'encodage de données avec codage de la correction d'erreurs sans voie de retour, un procédé de décodage de tels paquets de données transmis, des produits programmes d'ordinateur, et des nœuds de réseau configurés pour exécuter ces procédés. Dans un aspect, l'invention concerne un procédé de transmission de paquets de données entre des nœuds de réseau dans un réseau de communications sans fil utilisant un protocole d'encodage de données avec codage de la correction d'erreurs sans voie de retour. Le procédé comprend les étapes consistant à : encoder un paquet de données originales à l'aide d'une correction d'erreurs sans voie de retour pour former un premier paquet de données contenant une indication des données originales et un contrôle de détection d'erreur, et un second paquet de données contenant des bits de parité de code de correction d'erreurs sans voie de retour associés aux données originales dans le premier paquet de données ; transmettre le premier paquet de données à un nœud de réseau de réception via un premier trajet radio ; et transmettre le second paquet de données au nœud de réseau de réception via un second trajet radio. Des aspects et des modes de réalisation de l'invention confirment qu'il est possible, à l'intérieur d'un réseau sans fil, d'exécuter une transmission de données fiable sans augmenter le retard et la gigue grâce à l'utilisation d'un procédé hybride de correction d'erreurs sans voie de retour et de transmission de correction de données à diversité de trajet. Des systèmes peuvent permettre de remplacer des procédés de transmission de données HARQ ou peuvent, dans certains systèmes, être utilisés conjointement avec de tels procédés pour permettre, par exemple, une retransmission (diversité de temps) lorsqu'un transfert de données à l'aide d'une diversité de trajet (diversité en fréquence, par exemple) échoue. Certains systèmes confirment qu'un transfert de données fiable peut être amélioré en augmentant le nombre de trajets via lesquels les données sont envoyées.
PCT/GB2017/051984 2016-07-08 2017-07-05 Transmission de paquets de données entre des nœuds de réseau WO2018007813A1 (fr)

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GBGB1611930.7A GB201611930D0 (en) 2016-07-08 2016-07-08 Transmitting data packets between network nodes
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US10999006B2 (en) 2019-02-08 2021-05-04 Hewlett Packard Enterprise Development Lp Communications having reduced latency
CN114006846A (zh) * 2020-07-13 2022-02-01 中国移动通信有限公司研究院 IPv6数据包的传输方法及装置
CN114731495A (zh) * 2019-11-25 2022-07-08 标致雪铁龙汽车股份有限公司 用于车辆的数据传输方法和数据传输装置

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10999006B2 (en) 2019-02-08 2021-05-04 Hewlett Packard Enterprise Development Lp Communications having reduced latency
CN114731495A (zh) * 2019-11-25 2022-07-08 标致雪铁龙汽车股份有限公司 用于车辆的数据传输方法和数据传输装置
CN114006846A (zh) * 2020-07-13 2022-02-01 中国移动通信有限公司研究院 IPv6数据包的传输方法及装置
CN114006846B (zh) * 2020-07-13 2023-07-21 中国移动通信有限公司研究院 IPv6数据包的传输方法及装置

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