WO2015137854A1 - Method and devices for providing feedback in a communication system - Google Patents

Method and devices for providing feedback in a communication system Download PDF

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Publication number
WO2015137854A1
WO2015137854A1 PCT/SE2014/050305 SE2014050305W WO2015137854A1 WO 2015137854 A1 WO2015137854 A1 WO 2015137854A1 SE 2014050305 W SE2014050305 W SE 2014050305W WO 2015137854 A1 WO2015137854 A1 WO 2015137854A1
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WO
WIPO (PCT)
Prior art keywords
sub
blocks
block
receiving device
transmitting
Prior art date
Application number
PCT/SE2014/050305
Other languages
French (fr)
Inventor
Ather GATTAMI
Stefan Parkvall
Robert Baldemair
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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 Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/SE2014/050305 priority Critical patent/WO2015137854A1/en
Publication of WO2015137854A1 publication Critical patent/WO2015137854A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1635—Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes

Definitions

  • the technology disclosed herein relates generally to the field of feedback signaling, and in particular to feedback signaling in wireless communication networks.
  • Retransmission schemes are used in most wireless communication systems, such as e.g. Long Term Evolution (LTE) and High Speed Packet Access (HSPA).
  • LTE Long Term Evolution
  • HSPA High Speed Packet Access
  • a transmitting part transmits a message and re-transmits the message if it does not receive an acknowledgment (ACK) message from a receiving part within a certain time period.
  • the transmitting part can implement Forward Error Correction (FEC), thus adding redundancy to the transmitted information.
  • FEC Forward Error Correction
  • the FEC enables the receiving part to detect some errors in the message and correct these errors.
  • Classical ARQ schemes do not apply Forward Error Correction (FEC) but only Error Detection, which enables the receiving part to determine correctness of the message.
  • Hybrid ARQ is a combination of ARQ and FEC.
  • the FEC enables the receiving part to recover a message even if the message is corrupted, provided that the message is not too corrupted. If the receiving part fails to recover the message it sends a negative ACK (NACK) to the transmitting part to request a retransmission, otherwise it sends an ACK.
  • NACK negative ACK
  • retransmissions of the message are identical copies of the original transmission or different subsets of coded bits. The latter is called HARQ with incremental redundancy. In incremental redundancy thus, each retransmission contains different information than the previous one.
  • a data entity from/to a higher protocol layer is known as a Service Data Unit (SDU) and the corresponding entity to/from a lower protocol layer entity is denoted Protocol Data Unit (PDU).
  • SDU Service Data Unit
  • PDU Protocol Data Unit
  • RLC Radio Link Control
  • the RLC protocol is responsible for segmentation of RLC SDUs into the smaller units denoted RLC PDUs, see figure 1.
  • the RLC SDUs may for example comprise Internet Protocol (IP) Packets.
  • IP Internet Protocol
  • the receiving part which also comprises a RLC protocol, performs the corresponding reassembly of the received PDUs.
  • a retransmission protocol operates between the sending RLC protocol entity (i.e. the transmitting part) and the receiving RLC protocol entity (i.e. the receiving part).
  • the receiving part may then request retransmission of an incorrectly received PDU (incorrectly including a missing PDU) and send an ACK for each correctly received PDU.
  • HARQ typically operates on a lower level in a communication system, in particular on the air interface, providing feedback on a data block level.
  • the transmitting part Upon receiving the retransmission request, the transmitting part performs the retransmission of the initially sent first transmission and if this retransmission also fails to be correctly received, there is yet another delay when the transmitting part is again awaiting a retransmission request.
  • the above situation also causes high energy consumption and high use of processing capacity in the transmitting part as well as in the receiving part.
  • An object of the present teachings is to solve or at least alleviate at least one of the above mentioned problems.
  • the object is according to a first aspect achieved by a method of providing feedback performed in a receiving device.
  • the receiving device is capable of wireless communication with a transmitting device.
  • the method comprises receiving, from the transmitting device, an encoded message block, the message block comprising a number N of sub-blocks; decoding the received N sub-blocks; detecting at least one and less than N sub-blocks being erroneously decoded; and providing feedback information to the transmitting device, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
  • the method provides feedback from the receiving part to the transmitting part, reporting to the transmitting part on a more detailed level than prior art what parts of the message need to be retransmitted.
  • the method enables the transmitting part to spend more energy on error-correction of relevant information bits, instead of retransmitting the entire message. This will increase the probability of the receiving part being able to correctly decode at the second transmission (i.e. first
  • the method further allows for lower energy consumption for a fixed bit error rate at the receiving part.
  • the method further enables a more efficient use of available radio spectrum.
  • the object is according to a second aspect achieved by a receiving device.
  • the receiving device is capable of wireless communication with a transmitting device.
  • the receiving device comprises a processor and memory, the memory containing instructions executable by the processor, whereby the receiving device is operative to: receive, from the transmitting device, an encoded message block, the message block comprising a number N of sub-blocks; decode the received N sub-blocks; detect at least one and less than N sub-blocks being erroneously decoded; and provide feedback information to the transmitting node, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub- blocks.
  • the object is according to a third aspect achieved by a computer program for a receiving device.
  • the communication device is capable of wireless communication with a transmitting device.
  • the computer program comprises computer program code, which, when run on the receiving device causes the receiving device to: receive, from the transmitting device, an encoded message block, the message block comprising a number N of sub-blocks; decode the received N sub-blocks; detect at least one and less than N sub-blocks being erroneously decoded; and provide feedback information to the transmitting node, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub- blocks.
  • the object is according to a fourth aspect achieved by a computer program product comprising a computer program as above, and a computer readable means on which the computer program is stored.
  • the object is according to a fifth aspect achieved by a method of retransmission performed in a transmitting device.
  • the transmitting device is capable of wireless communication with a receiving device.
  • the method comprises transmitting, to the receiving device, an encoded message block, the message block comprising a number N of sub-blocks; receiving, from the receiving device, feedback information indicating at least one and less than N erroneously decoded sub-blocks; and transmitting, to the receiving device, a retransmission of parts of the message block, the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
  • the object is according to a sixth aspect achieved by a transmitting device for retransmission, the transmitting device being capable of wireless communication with a receiving device.
  • the transmitting device comprises a processor and memory, the memory containing instructions executable by the processor, whereby the transmitting device is operative to: transmit, to the receiving device, an encoded message block, the message block comprising a number N of sub-blocks; receive, from the receiving device, feedback information indicating at least one and less than N erroneously decoded sub-blocks; and transmit, to the receiving device, a
  • the retransmission comprising the sub- blocks indicated in the feedback information as erroneously decoded.
  • the object is according to a seventh aspect achieved by a computer program for a transmitting device, the transmitting device being capable of wireless communication with a receiving device.
  • the computer program comprises computer program code, which, when run on the transmitting device causes the transmitting device to:
  • the object is according to a eight aspect achieved by a computer program product comprising a computer program as above and computer readable means on which the computer program is stored.
  • Figure 1 illustrates segmentation of data units into smaller units.
  • Figure 2 illustrates a situation wherein several retransmissions are needed.
  • Figure 3 illustrates the portioning of a message block into sub-blocks.
  • Figure 4 illustrates a particular environment in which embodiments of the present disclosure may be implemented.
  • Figure 5 illustrates a general environment in which embodiments of the present disclosure may be implemented.
  • Figure 6 illustrates a flow chart over steps of a method in a receiving device in accordance with the present disclosure.
  • Figure 7 illustrates schematically a receiving device and means for implementing methods of the present disclosure.
  • Figure 8 illustrates a receiving device comprising function modules/ software modules for implementing embodiments of the method of the present disclosure.
  • Figure 9 illustrates a flow chart over steps of a method in a transmitting device in accordance with the present disclosure.
  • Figure 10 illustrates schematically a transmitting device and means for implementing methods of the present disclosure.
  • Figure 11 illustrates a transmitting device comprising function modules/software modules for implementing embodiments of the method of the present disclosure.
  • the retransmission protocol can be seen as a combination of HARQ and RLC, that is, as two feedback loops involved, where HARQ is on data block level, and RLC is on a PDU level, wherein a PDU typically comprises several data blocks.
  • the RLC protocol points out errors on a PDU level, potentially involving a high number of bits in the retransmission.
  • a retransmission using HARQ might involve bits from an entire message M, whereas the error might involve only a small portion of it. This causes inefficiency both in time and energy.
  • the feedback of the present disclosure may be a message consisting of a larger alphabet than the traditional binary alphabet, which represents the feedback signals ACK and NACK.
  • the feedback from the receiving part will tell the transmitting part what specific parts of a data block should be retransmitted, instead of
  • N smaller blocks may have equal size or be partitioned so as to have different size. For instance, in case of a time- varying channel being at a state with low distortion during a certain period of time, the number of symbols could be increased in a sub-block transmitted during that period of time, i.e. a larger sized sub-block could then be transmitted.
  • the message block 10 may be encoded in one single code word which is then split into the N sub- blocks Si,..., Si,..., SN. Alternatively, the message block 10 may be split into sub-blocks Si,..., Si,..., SN and each sub-block Si then be encoded separately.
  • the feedback of the present disclosure maybe provided as feedback of hard bits. If the receiving part discovers that an error has occurred in sub-block Si then the receiving part may send a feedback signal in the form of a binary sequence B of length N in accordance with:
  • the transmitting part may spend time and energy on transmitting information related to this specific sub- block Si, instead of spending time and energy on information related to the entire message block 10. Thereby the probability of the receiving part receiving this sub- block Si correctly is increased.
  • the binary message B will contain ones at positions where errors occurred at the receiving part and zeroes at positions where no errors were detected (or vice versa).
  • the feedback may be represented by other types of alphabets, not necessary binary (ones/zeroes). Examples of such other types of alphabets comprise hexadecimal alphabet, decimal alphabet etc. which would use hexadecimal symbols and decimal symbols, respectively.
  • embodiments of the present disclosure are highly advantageous and usable for the cases where the binary message B is not merely a sequence of zeroes, or a sequence of ones. A sequence of zeroes would translate to a conventional ACK since all sub-blocks are then correct, and a sequence of ones would translate to a
  • feedback may be provided on the starting position of the first bit or sub-block Si where an error occurred.
  • the feedback may further comprise the length of error events in terms of bits or sub-blocks. For example, if sub-blocks Si-i and Si were decoded erroneously, then the feedback may comprise the information i-i for the position of the first erroneously decoded sub- block and also the information 2, for two subsequent sub-blocks being the length of error events.
  • the feedback of the present disclosure may be provided as feedback of soft bits.
  • Soft bits are probabilities describing the correctness of the decoded bit. In various embodiments of the present disclosure this is taken advantage of in order to provide a "richer" feedback, i.e. providing more informative feedback.
  • the receiving part may provide such feedback to the transmitting part, wherein it sends back soft values of one or more sub-blocks Si,..., Si,..., SN. That is, the receiving part may send as feedback the probabilities of the values of the bits (ones or zeroes) involved in a sub- block Si being correctly received as a one or zero.
  • turbo codes i.e. comprising a turbo encoder
  • the feedback may be a single soft value for the complete sub-block Si, i.e. describing the decoding status of the complete sub-block Si, or multiple soft values per sub- block, i.e. in the most detailed case one soft value per bit describing the decoding status of this bit.
  • the soft bits are not limited to turbo Codes; another example comprises low-density parity-check (LDPC) codes.
  • the feedback of the present disclosure may be provided as feedback of hard and soft bits. That is, the feedback may comprise a combination of the above described feedback loops with respect to hard and soft bits.
  • FIG. 4 illustrates a particular environment in which embodiments of the present disclosure may be implemented.
  • a communication system 1 comprising a core network 3 and a radio access network 2 provides wireless communication for a number of communication devices 8.
  • the communication system 1 maybe connected to external networks, e.g. packet data networks (PDNs) 4 such as for example
  • PDNs packet data networks
  • the radio access network 2 comprises radio access nodes 5 capable of communicating wirelessly with the communication devices 8.
  • the radio access nodes are known as evolved NodeBs.
  • the core network 3 comprises nodes such as a first gateway 9 providing connectivity to the external PDNs and second gateway 7 handling e.g.
  • the first gateway is the Packet Data Network GateWay, PDN-GW
  • the second gateway 7 is the Serving GateWay, S-GW.
  • aspects of the present disclosure may be implemented in various communication systems, besides the above described case of LTE, for example in High Speed Packet Access (HSPA) systems, or in other communication systems using other radio access technologies, and also in device-to-device (D2D) scenarios and in systems wherein wired communication links are replaced with wireless
  • HSPA High Speed Packet Access
  • D2D device-to-device
  • LTE implements HARQ with incremental redundancy.
  • This HARQ feedback scheme is implemented on the radio link between the eNode B 5 and the communication device 8.
  • the eNodeB 5 implements a RLC protocol and may receive a RLC SDU intended for the communication device 8.
  • the RLC protocol of the eNodeB then segments the RLC SDU into the smaller RLC PDUs.
  • a retransmission protocol operates between the RLC protocol of the eNodeB 5
  • this retransmission protocol can be seen as a combination of HARQ and RLC, that is, as comprising two feedback loops, where HARQ is on data block level, and RLC is on a PDU level, wherein a PDU typically comprises several data blocks.
  • the communication device 8 may then request retransmission of a missing or an incorrectly received PDU and send an ACK for each correctly received PDU.
  • the RLC PDUs are segmented into even smaller units, data blocks, before transmission over an air interface to the receiving part.
  • the HARQ feedback scheme operates on such data blocks.
  • the various embodiments of the present disclosure may be implemented on this HARQ feedback scheme thereby providing feedback on sub-blocks of the blocks on which the HARQ operates.
  • the feedback of the present disclosure can, when implemented in such situation, be seen as an improved, more detailed HARQ feedback, i.e. HARQ with rich feedback.
  • the feedback scheme may be seen as a third rich feedback on sub-block level, in addition to the RLC feedback (on PDU level) and the HARQ (on data block level).
  • FIG. 5 is a more general illustration, wherein instead of the above communication device 8 a receiving device 11 is providing the rich feedback of the present disclosure.
  • the above eNodeB 5 as transmitting part may correspondingly more generally be seen as a transmitting device 12.
  • the receiving device 11 and the transmitting device 12 may for example be devices of a D2D scenario wherein the devices are communicating with each other. Then typically, both devices are alternately the receiving part and transmitting part. That is, both devices are capable of providing rich feedback according to an aspect of the present disclosure, as well as capable of retransmissions according to received rich feedback. Aspects of the present disclosure are thus applicable to any radio link.
  • Figure 6 illustrates a flow chart over steps of a method 20 in a receiving device 11, 8 in accordance with the present disclosure.
  • the method 20 of providing feedback may be performed in a receiving device 11, 8, e.g. as the one described in relation to figures 4 and 5.
  • the receiving device 11, 8 is capable of wireless communication with a transmitting device 12, 5.
  • the communication system 1 may, but need not, implement a first feedback scheme, e.g. a HARQ scheme for providing feedback of a message block 10.
  • the method 20 comprises receiving 21, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub- blocks, Si, SN.
  • the method 20 comprises decoding 22 the received N sub-blocks, Si, SN.
  • the decoding may be done in a conventional way. If the message block 10 was encoded in the transmitting device 12, 5 in one single code word, and subsequently split into N sub-blocks, then the decoding 11 is performed in reverse order, i.e. first reassemble (or join) the N sub-blocks and then decode the message block 10. If the message block 10 was, in the transmitting device 12, 5, first split into sub-blocks and each sub-block encoded separately, then the decoding 22 is performed by decoding each sub-block and then reassemble the sub-blocks to the message block 10.
  • the method 20 comprises detecting 23 at least one and less than N sub-blocks being erroneously decoded.
  • the detecting 23 may for example be performed by the decoder calculating a probability of error of a certain sub-block.
  • the method 20 comprises providing 24 feedback information to the transmitting device 12, 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
  • the feedback that is provided is thus on a sub-block level and not at the level of the entire message block.
  • the communication system 1 may implement a first feedback scheme, as mentioned earlier, then the feedback provided by the method 20
  • the method 20 comprises receiving 24, from the transmitting device 12, 5, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneous.
  • the delay between the first transmission and the second transmission may be shorter compared to prior art, since the transmitting device 12, 5 may transmit only the relevant parts of the initially sent message block 10, the relevant parts being the parts that the receiving device 11, 8 did not decode correctly.
  • the receiving device 11, 8 receiving such retransmission has now an increased chance of decoding the message block 10 correctly.
  • the providing 24 comprises transmitting a feedback signal comprising a sequence of N symbols, each symbol of the sequence indicating whether corresponding sub-block was decoded correctly or erroneously.
  • the sequence comprises a binary sequence and each symbol comprises a binary symbol.
  • a bit set to 1 indicates that the corresponding sub-block was received erroneously, and wherein a bit set to o indicates that the corresponding sub-block was decoded correctly; or wherein a bit set to o indicates that the corresponding sub-block was decoded erroneously, and wherein a bit set to 1 indicates that the corresponding sub-block was decoded correctly.
  • the providing 24 comprises transmitting a feedback signal comprising an indication of a first erroneously decoded sub-block or a first erroneously decoded bit of a sub-block.
  • the providing 24 comprises transmitting feedback information comprising a soft-value for each sub-block, Si, SN.
  • the providing 24 comprises transmitting feedback information comprising a soft-value for each bit of each sub-block, Si, SN.
  • the method 20 comprises compressing the feedback information and the providing 24 feedback information then comprises transmitting the compressed feedback information.
  • An advantage of this embodiment is the reduced need of communication resources.
  • a hybrid automatic repeat request, HARQ, feedback scheme is performed for the encoded message block 10, and the providing 24 feedback information comprises providing feedback on a sub-block level of the HARQ feedback scheme.
  • This embodiment may be seen as a HARQ feedback scheme with rich feedback information, i.e. the richness comprising the indication of errors on sub- block level.
  • FIG. 7 illustrates schematically a receiving device 11, 8 and means for implementing methods of the present disclosure.
  • the receiving device 11, 8 comprises a processor 30 comprising any combination of one or more of a central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit etc. capable of executing software instructions stored in a memory 31, which can thus be a computer program product 31.
  • the processor 30 can be configured to execute any of the various embodiments of the method as described e.g. in relation to figure 6.
  • the receiving device 11, 8 comprises receiving and transmitting means, as indicated schematically at reference numeral 33.
  • the receiving device 11, 8 further comprises encoder/decoder 34 and modulator/demodulator 35 so as to be able to receive, demodulate and decode a received message block 10.
  • a data memory may also be provided for reading and/or storing data during execution of software instructions in the processor 30.
  • Such data memory can be any combination of read and write memory (RAM) and read only memory (ROM).
  • the receiving device 11, 8 may be any type of device able to communicate wirelessly with the transmitting device 12, 5, it may for example be a smart phone, a user equipment, a laptop computer, handheld device etc.
  • the receiving device 11, 8 may comprise still further components, not illustrated, for example user input device, display etc.
  • the receiving device 11, 8 may be configured to perform any of the embodiments of the method as has been described.
  • the receiving device 11, 8 is capable of wireless communication with a transmitting device 5.
  • the communication device 8 capable of such wireless communication may comprise transmitting and receiving means 33 and be configured for wireless communication using the particular radio air interface implemented in a communication system l in which it is configured to operate.
  • the receiving device 11, 8 comprises a processor 30 and memory 31, the memory 31 containing instructions executable by the processor 30, whereby the receiving device 11, 8 is operative to:
  • the transmitting device 12 provides feedback information to the transmitting device 12, 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
  • the receiving device 11, 8 is further operative to:
  • the receiving device 11, 8 is configured to provide by transmitting a feedback signal comprising a sequence of N symbols, each symbol of the sequence indicating whether corresponding sub-block was decoded correctly or erroneously.
  • the sequence comprises a binary sequence and each symbol comprises a binary symbol.
  • each symbol comprises a binary symbol.
  • alphabets or bases than the binary one is used, and the symbols may e.g. in a hexadecimal alphabet comprise a hexadecimal symbol, in a decimal alphabet the symbols comprise a decimal symbol, etc. Any base may thus be used for the sequence indicating errors on a sub-block level.
  • the receiving device 11, 8 is configured to indicate by a bit set to 1 that the corresponding sub-block was received erroneously, and to indicate by a bit set to o that the corresponding sub-block was decoded correctly; or configured to indicate by a bit set to o that the corresponding sub-block was decoded erroneously, and operative to indicate by a bit set to 1 that the corresponding sub-block was decoded correctly.
  • the receiving device 11, 8 is configured to provide by transmitting a feedback signal comprising an indication of a first erroneously decoded sub-block or a first erroneously decoded bit of a sub-block.
  • the receiving device n, 8 is configured to provide by transmitting feedback information comprising a soft-value for each sub-block, Si, SN.
  • the receiving device n, 8 is configured to provide by transmitting feedback information comprising a soft-value for each bit of each sub-block, Si, SN.
  • the receiving device n, 8 is configured to compress the feedback information and configured to provide by transmitting the compressed feedback information.
  • the receiving device n, 8 is configured to perform a hybrid automatic repeat request, HARQ, feedback scheme for the encoded message block 10, and configured to provide feedback on a sub-block level of the HARQ feedback scheme.
  • the message block comprises a Packet Data Unit of a Radio Link Control Protocol.
  • the present disclosure also encompasses a computer program product 31 comprising a computer program 32 for implementing the embodiments of the method as have been described, and a computer readable means on which the computer program 32 is stored.
  • the computer program product 31 may be any combination of read and write memory (RAM) or read only memory (ROM).
  • the computer program product 31 may also comprise persistent storage, which for example can be any single one or combination of magnetic memory, optical memory or solid state memory.
  • the present disclosure thus comprises a computer program 32 for a receiving device 11, 8, wherein the receiving device 11, 8 is capable of wireless communication with a transmitting device 12, 5.
  • the computer program 32 comprises computer program code, which, when run on the receiving device 11, 8 causes the receiving device n, 8 to:
  • the message block 10 comprising a number N of sub-blocks, Si, SN,
  • the transmitting device 12 provides feedback information to the transmitting device 12, 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
  • the computer program product 31, or the memory thus comprises instructions executable by the processor 30.
  • Such instructions may be comprised in a computer program 32, or in one or more software modules or function modules.
  • FIG 8 An example of an implementation using function modules and/ or software modules is illustrated in figure 8, in particular illustrating a receiving device 11, 8 comprising such means for implementing embodiments of the described method.
  • the receiving device 11, 8 is capable of wireless communication with a transmitting device 12, 5, and comprises first means, e.g. a first functional module, 41 for receiving, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN.
  • first means e.g. a first functional module, 41 for receiving, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN.
  • the receiving device 11, 8 comprises second means, e.g. a second functional module, 42 for decoding the received N sub-blocks, Si, SN.
  • second means e.g. a second functional module, 42 for decoding the received N sub-blocks, Si, SN.
  • the receiving device 11, 8 comprises third means, e.g. a third functional module, 43 for detecting at least one and less than N sub-blocks being erroneously decoded.
  • third means e.g. a third functional module, 43 for detecting at least one and less than N sub-blocks being erroneously decoded.
  • the receiving device 11, 8 comprises fourth means, e.g. a fourth functional module, 44 for providing feedback information to the transmitting node 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
  • the receiving device 11, 8 may comprise still additional means, e.g. means for receiving, from the transmitting device 12, 5, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneous. Still other means may further be provided, e.g.
  • Figure 9 illustrates a flow chart over steps of a method 20 in a transmitting device 12, 5 in accordance with the present disclosure.
  • the method 40 of retransmission is performed in a transmitting device 12, 5, the transmitting device 12, 5 being capable of wireless communication with a receiving device 11, 8.
  • An example of such transmitting device 11, 5 comprises a base station providing wireless communication to the receiving device 11, 8.
  • the method 40 comprises transmitting 41, to the receiving device 11, 8, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN.
  • the transmitting device 12, 5 may encode the message block 10 in one single code word, which is then split into N sub-blocks and transmitted.
  • the transmitting device 12, 5 may split the message block 10 into N sub-blocks and encode each sub-block separately.
  • the method 40 comprises receiving 42, from the receiving device 11, 8, feedback information indicating at least one and less than N erroneously decoded sub-blocks.
  • the method 40 comprises transmitting 43, to the receiving device 11, 8, a
  • the transmitting device 12, 5 may resend only the parts of the message block 10 that are indicated in the feedback signal as erroneously decoded. The method thus provides reduced delay as well as reduced need of processing capacity and processing time.
  • FIG. 10 illustrates schematically a transmitting device 12, 5 and means for implementing methods of the present disclosure.
  • the transmitting device 12, 5 comprises a processor 50 comprising any combination of one or more of a central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit etc. capable of executing software instructions stored in a memory 51, which can thus be a computer program product 51.
  • the processor 50 can be configured to execute the method as described e.g. in relation to figure 9.
  • the transmitting device 12, 5 comprises receiving and transmitting means, as indicated schematically at reference numeral 53.
  • the transmitting device 12, 5 may for example be a base station node, or a transmitting device in a D2D
  • the transmitting device 12, 5 may for example comprise signal processing circuitry, scheduler, antenna controlling devices, user interfaces, input devices, etc.
  • the transmitting device 12, 5 is capable of wireless communication with a receiving device 11, 8.
  • the transmitting device 12, 5 comprises a processor 50 and memory 51, the memory 51 containing instructions executable by the processor 50, whereby the transmitting device 12, 5 is operative to:
  • the message block 10 comprising a number N of sub-blocks, Si, SN,
  • the present disclosure also encompasses a computer program product 51 comprising a computer program 52 for implementing the method as has been described, and a computer readable means on which the computer program 52 is stored.
  • the computer program product 51 maybe any combination of read and write memory (RAM) or read only memory (ROM).
  • the computer program product 51 may also comprise persistent storage, which for example can be any single one or combination of magnetic memory, optical memory or solid state memory.
  • the present disclosure thus comprises a computer program 52 for a transmitting device 11, 5, the transmitting device 11, 5 being capable of wireless communication with a receiving device 8.
  • the computer program 52 comprises computer program code, which, when run on the transmitting device 12, 5 causes the transmitting device 12, 5 to:
  • the message block 10 comprising a number N of sub-blocks, Si, SN,
  • FIG 11 An example of an implementation using function modules and/ or software modules is illustrated in figure 11, in particular illustrating a transmitting device 12, 5 comprising such means for implementing embodiments of the described method.
  • the transmitting device 12, 5 is capable of wireless communication with a receiving device 11, 8, and comprises first means, e.g. a first functional module, 61 for transmitting, to the receiving device 11, 8, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN.
  • first means e.g. a first functional module, 61 for transmitting, to the receiving device 11, 8, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN.
  • the transmitting device 12, 5 comprises second means, e.g. a second functional module, 62 for receiving, from the receiving device 11, 8, feedback information indicating at least one and less than N erroneously decoded sub-blocks.
  • second means e.g. a second functional module, 62 for receiving, from the receiving device 11, 8, feedback information indicating at least one and less than N erroneously decoded sub-blocks.
  • the transmitting device 12, 5 comprises third means, e.g. a third functional module, for transmitting, to the receiving device 11, 8, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
  • third means e.g. a third functional module
  • the transmitting device 12, 5 may comprise still additional means (not illustrated).

Abstract

The disclosure relates to a method 20 of providing feedback performed in a receiving device 8. The receiving device 8 is capable of wireless communication with a transmitting device 12, 5. The method 20 comprises: receiving 21, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, S1,..., SN; decoding 22 the received N sub-blocks, S1,..., SN; detecting 23 at least one and less than N sub-blocks being erroneously decoded; and providing 24 feedback information to the transmitting node 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks. The disclosure also relates to corresponding method in a transmitting device, to receiving device, transmitting device, computer programs and computer program products.

Description

Method and devices for providing feedback in a communication system Technical field
The technology disclosed herein relates generally to the field of feedback signaling, and in particular to feedback signaling in wireless communication networks.
Background
Retransmission schemes are used in most wireless communication systems, such as e.g. Long Term Evolution (LTE) and High Speed Packet Access (HSPA). In a simple Automatic Repeat Request (ARQ) scheme a transmitting part transmits a message and re-transmits the message if it does not receive an acknowledgment (ACK) message from a receiving part within a certain time period. The transmitting part can implement Forward Error Correction (FEC), thus adding redundancy to the transmitted information. The FEC enables the receiving part to detect some errors in the message and correct these errors. Classical ARQ schemes do not apply Forward Error Correction (FEC) but only Error Detection, which enables the receiving part to determine correctness of the message.
Hybrid ARQ (HARQ) is a combination of ARQ and FEC. As mentioned, the FEC enables the receiving part to recover a message even if the message is corrupted, provided that the message is not too corrupted. If the receiving part fails to recover the message it sends a negative ACK (NACK) to the transmitting part to request a retransmission, otherwise it sends an ACK. Depending on the particular type of HARQ scheme applied, retransmissions of the message are identical copies of the original transmission or different subsets of coded bits. The latter is called HARQ with incremental redundancy. In incremental redundancy thus, each retransmission contains different information than the previous one.
In general, a data entity from/to a higher protocol layer is known as a Service Data Unit (SDU) and the corresponding entity to/from a lower protocol layer entity is denoted Protocol Data Unit (PDU). In communication systems providing wireless communication a Radio Link Control (RLC) protocol is used. The RLC protocol is responsible for segmentation of RLC SDUs into the smaller units denoted RLC PDUs, see figure 1. The RLC SDUs may for example comprise Internet Protocol (IP) Packets. The receiving part, which also comprises a RLC protocol, performs the corresponding reassembly of the received PDUs.
A retransmission protocol operates between the sending RLC protocol entity (i.e. the transmitting part) and the receiving RLC protocol entity (i.e. the receiving part). The receiving part may then request retransmission of an incorrectly received PDU (incorrectly including a missing PDU) and send an ACK for each correctly received PDU. HARQ typically operates on a lower level in a communication system, in particular on the air interface, providing feedback on a data block level.
It may happen that also a retransmitted message, irrespective of feedback scheme and level within a communication system, fails to reach the receiving part correctly, and hence, multiple retransmissions may be needed. This implies that multiple feedback signals might be needed, which in turn leads to high delay before the receiving part has correctly decoded the entire message. In particular, and as illustrated in figure 2, in case that a first transmission requires a retransmission, there is a time delay when the transmitting part is waiting for a feedback signal requesting a retransmission (i.e. a retransmission request). Upon receiving the retransmission request, the transmitting part performs the retransmission of the initially sent first transmission and if this retransmission also fails to be correctly received, there is yet another delay when the transmitting part is again awaiting a retransmission request.
Besides the high delay, the above situation also causes high energy consumption and high use of processing capacity in the transmitting part as well as in the receiving part.
Summary
An object of the present teachings is to solve or at least alleviate at least one of the above mentioned problems.
The object is according to a first aspect achieved by a method of providing feedback performed in a receiving device. The receiving device is capable of wireless communication with a transmitting device. The method comprises receiving, from the transmitting device, an encoded message block, the message block comprising a number N of sub-blocks; decoding the received N sub-blocks; detecting at least one and less than N sub-blocks being erroneously decoded; and providing feedback information to the transmitting device, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
The method provides feedback from the receiving part to the transmitting part, reporting to the transmitting part on a more detailed level than prior art what parts of the message need to be retransmitted. Thus, the method enables the transmitting part to spend more energy on error-correction of relevant information bits, instead of retransmitting the entire message. This will increase the probability of the receiving part being able to correctly decode at the second transmission (i.e. first
retransmission), thus reducing retransmission costs and delay compared to being forced to use yet additional retransmissions. The method further allows for lower energy consumption for a fixed bit error rate at the receiving part. The method further enables a more efficient use of available radio spectrum.
The object is according to a second aspect achieved by a receiving device. The receiving device is capable of wireless communication with a transmitting device. The receiving device comprises a processor and memory, the memory containing instructions executable by the processor, whereby the receiving device is operative to: receive, from the transmitting device, an encoded message block, the message block comprising a number N of sub-blocks; decode the received N sub-blocks; detect at least one and less than N sub-blocks being erroneously decoded; and provide feedback information to the transmitting node, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub- blocks.
The object is according to a third aspect achieved by a computer program for a receiving device. The communication device is capable of wireless communication with a transmitting device. The computer program comprises computer program code, which, when run on the receiving device causes the receiving device to: receive, from the transmitting device, an encoded message block, the message block comprising a number N of sub-blocks; decode the received N sub-blocks; detect at least one and less than N sub-blocks being erroneously decoded; and provide feedback information to the transmitting node, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub- blocks.
The object is according to a fourth aspect achieved by a computer program product comprising a computer program as above, and a computer readable means on which the computer program is stored.
The object is according to a fifth aspect achieved by a method of retransmission performed in a transmitting device. The transmitting device is capable of wireless communication with a receiving device. The method comprises transmitting, to the receiving device, an encoded message block, the message block comprising a number N of sub-blocks; receiving, from the receiving device, feedback information indicating at least one and less than N erroneously decoded sub-blocks; and transmitting, to the receiving device, a retransmission of parts of the message block, the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
The object is according to a sixth aspect achieved by a transmitting device for retransmission, the transmitting device being capable of wireless communication with a receiving device. The transmitting device comprises a processor and memory, the memory containing instructions executable by the processor, whereby the transmitting device is operative to: transmit, to the receiving device, an encoded message block, the message block comprising a number N of sub-blocks; receive, from the receiving device, feedback information indicating at least one and less than N erroneously decoded sub-blocks; and transmit, to the receiving device, a
retransmission of parts of the message block, the retransmission comprising the sub- blocks indicated in the feedback information as erroneously decoded.
The object is according to a seventh aspect achieved by a computer program for a transmitting device, the transmitting device being capable of wireless communication with a receiving device. The computer program comprises computer program code, which, when run on the transmitting device causes the transmitting device to:
transmit, to the receiving device, an encoded message block, the message block comprising a number N of sub-blocks; receive, from the receiving device, feedback information indicating at least one and less than N erroneously decoded sub-blocks; and transmit, to the receiving device, a retransmission of parts of the message block, the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
The object is according to a eight aspect achieved by a computer program product comprising a computer program as above and computer readable means on which the computer program is stored.
Further features and advantages of the present teachings will become clear upon reading the following description and the accompanying drawings.
Brief description of the drawings
Figure 1 illustrates segmentation of data units into smaller units.
Figure 2 illustrates a situation wherein several retransmissions are needed.
Figure 3 illustrates the portioning of a message block into sub-blocks.
Figure 4 illustrates a particular environment in which embodiments of the present disclosure may be implemented.
Figure 5 illustrates a general environment in which embodiments of the present disclosure may be implemented.
Figure 6 illustrates a flow chart over steps of a method in a receiving device in accordance with the present disclosure.
Figure 7 illustrates schematically a receiving device and means for implementing methods of the present disclosure.
Figure 8 illustrates a receiving device comprising function modules/ software modules for implementing embodiments of the method of the present disclosure.
Figure 9 illustrates a flow chart over steps of a method in a transmitting device in accordance with the present disclosure.
Figure 10 illustrates schematically a transmitting device and means for implementing methods of the present disclosure. Figure 11 illustrates a transmitting device comprising function modules/software modules for implementing embodiments of the method of the present disclosure.
Detailed description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, interfaces, techniques, etc. in order to provide a thorough understanding. In other instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description with unnecessary detail. Same reference numerals refer to same or similar elements throughout the description.
Reverting to the situation illustrated in figure 2, i.e. the situation wherein several retransmissions are needed. In for example LTE, the retransmission protocol can be seen as a combination of HARQ and RLC, that is, as two feedback loops involved, where HARQ is on data block level, and RLC is on a PDU level, wherein a PDU typically comprises several data blocks. The RLC protocol points out errors on a PDU level, potentially involving a high number of bits in the retransmission. Also, a retransmission using HARQ might involve bits from an entire message M, whereas the error might involve only a small portion of it. This causes inefficiency both in time and energy.
Briefly, in order to address and improve on e.g. situations as the above, a rich feedback is introduced in accordance with an aspect of the present disclosure. This rich feedback enables increased retransmission efficiency. The feedback of the present disclosure may be a message consisting of a larger alphabet than the traditional binary alphabet, which represents the feedback signals ACK and NACK. In the present disclosure, the feedback from the receiving part will tell the transmitting part what specific parts of a data block should be retransmitted, instead of
retransmitting information about the entire message. This will increase the
probability of error-correction at the retransmission.
With reference now to figure 3, a message block 10 of block-length L to be
transmitted is partitioned in N smaller blocks. These N smaller blocks may have equal size or be partitioned so as to have different size. For instance, in case of a time- varying channel being at a state with low distortion during a certain period of time, the number of symbols could be increased in a sub-block transmitted during that period of time, i.e. a larger sized sub-block could then be transmitted. The
partitioning of the blocks may be effectuated in several different ways. The message block 10 may be encoded in one single code word which is then split into the N sub- blocks Si,..., Si,..., SN. Alternatively, the message block 10 may be split into sub-blocks Si,..., Si,..., SN and each sub-block Si then be encoded separately.
The feedback of the present disclosure maybe provided as feedback of hard bits. If the receiving part discovers that an error has occurred in sub-block Si then the receiving part may send a feedback signal in the form of a binary sequence B of length N in accordance with:
B = (o, o, ... , l, o , o, o) back to the transmitting part, where the l is in position i. Then, the transmitting part may spend time and energy on transmitting information related to this specific sub- block Si, instead of spending time and energy on information related to the entire message block 10. Thereby the probability of the receiving part receiving this sub- block Si correctly is increased. In general, the binary message B will contain ones at positions where errors occurred at the receiving part and zeroes at positions where no errors were detected (or vice versa). It is noted that the feedback may be represented by other types of alphabets, not necessary binary (ones/zeroes). Examples of such other types of alphabets comprise hexadecimal alphabet, decimal alphabet etc. which would use hexadecimal symbols and decimal symbols, respectively.
It is also possible to use compression schemes to reduce the size of the binary message B prior to transmission thereof, thus saving communication resources and reducing feedback overhead. Typically such compression schemes may be lossy, i.e. the binary message B may not be reconstructed completely at the receiving part (i.e. at the transmitting part that sent the message block 10 and receives feedback on the transmission). As long as erroneous blocks in the binary message B remain also erroneous in the compressed binary message B, the receiving part will be able to decode it. A consequence of using such compression might be that potentially too many retransmissions occur while the feedback rate is reduced. However,
compression provides a good tradeoff between retransmission and feedback overhead. It is noted that embodiments of the present disclosure are highly advantageous and usable for the cases where the binary message B is not merely a sequence of zeroes, or a sequence of ones. A sequence of zeroes would translate to a conventional ACK since all sub-blocks are then correct, and a sequence of ones would translate to a
conventional NACK since all sub-blocks are wrong. In such cases a conventional feedback scheme on the message block 10 level could instead be used, if the communication implements such feedback. That is, when detecting that all N sub- blocks Si,..., Si,..., SN have been erroneously decoded, feedback information comprising a negative acknowledgment relating to the entire message block 10 may be used. Correspondingly, when detecting that all N sub-blocks Si,..., Si,..., SN have been correctly decoded, feedback information comprising an acknowledgment relating to the entire message block 10 may be used.
In other embodiments of the present disclosure, feedback may be provided on the starting position of the first bit or sub-block Si where an error occurred. The feedback may further comprise the length of error events in terms of bits or sub-blocks. For example, if sub-blocks Si-i and Si were decoded erroneously, then the feedback may comprise the information i-i for the position of the first erroneously decoded sub- block and also the information 2, for two subsequent sub-blocks being the length of error events.
The feedback of the present disclosure may be provided as feedback of soft bits. For example Turbo codes work with soft bits. Soft bits are probabilities describing the correctness of the decoded bit. In various embodiments of the present disclosure this is taken advantage of in order to provide a "richer" feedback, i.e. providing more informative feedback.
The receiving part, implementing e.g. turbo codes (i.e. comprising a turbo encoder), may provide such feedback to the transmitting part, wherein it sends back soft values of one or more sub-blocks Si,..., Si,..., SN. That is, the receiving part may send as feedback the probabilities of the values of the bits (ones or zeroes) involved in a sub- block Si being correctly received as a one or zero.
The feedback may be a single soft value for the complete sub-block Si, i.e. describing the decoding status of the complete sub-block Si, or multiple soft values per sub- block, i.e. in the most detailed case one soft value per bit describing the decoding status of this bit. It is that noted that the soft bits are not limited to turbo Codes; another example comprises low-density parity-check (LDPC) codes.
The feedback of the present disclosure may be provided as feedback of hard and soft bits. That is, the feedback may comprise a combination of the above described feedback loops with respect to hard and soft bits.
Figure 4 illustrates a particular environment in which embodiments of the present disclosure may be implemented. A communication system 1 comprising a core network 3 and a radio access network 2 provides wireless communication for a number of communication devices 8. The communication system 1 maybe connected to external networks, e.g. packet data networks (PDNs) 4 such as for example
Internet.
The radio access network 2 comprises radio access nodes 5 capable of communicating wirelessly with the communication devices 8. In case of the communication system 1 being a Long Term Evolution (LTE) system, the radio access nodes are known as evolved NodeBs. The core network 3 comprises nodes such as a first gateway 9 providing connectivity to the external PDNs and second gateway 7 handling e.g.
management of IP tunnels between the access node and the first gateway 9. In case of LTE, the first gateway is the Packet Data Network GateWay, PDN-GW, and the second gateway 7 is the Serving GateWay, S-GW.
It is noted that aspects of the present disclosure may be implemented in various communication systems, besides the above described case of LTE, for example in High Speed Packet Access (HSPA) systems, or in other communication systems using other radio access technologies, and also in device-to-device (D2D) scenarios and in systems wherein wired communication links are replaced with wireless
communication radio links. In the following, a particular situation in which aspects of the present disclosure may be implanted will be described, in relation to LTE, RLC and HARQ.
As mentioned earlier, LTE implements HARQ with incremental redundancy. This HARQ feedback scheme is implemented on the radio link between the eNode B 5 and the communication device 8. The eNodeB 5 implements a RLC protocol and may receive a RLC SDU intended for the communication device 8. The RLC protocol of the eNodeB then segments the RLC SDU into the smaller RLC PDUs. The communication device 8, which also comprises a RLC protocol, performs the corresponding reassembly of the received PDUs.
A retransmission protocol operates between the RLC protocol of the eNodeB 5
(transmitting part) and the RLC protocol of the communication device 8 (receiving part). In LTE, this retransmission protocol can be seen as a combination of HARQ and RLC, that is, as comprising two feedback loops, where HARQ is on data block level, and RLC is on a PDU level, wherein a PDU typically comprises several data blocks. The communication device 8 may then request retransmission of a missing or an incorrectly received PDU and send an ACK for each correctly received PDU.
In particular, the RLC PDUs are segmented into even smaller units, data blocks, before transmission over an air interface to the receiving part. In LTE, the HARQ feedback scheme operates on such data blocks. The various embodiments of the present disclosure may be implemented on this HARQ feedback scheme thereby providing feedback on sub-blocks of the blocks on which the HARQ operates. The feedback of the present disclosure can, when implemented in such situation, be seen as an improved, more detailed HARQ feedback, i.e. HARQ with rich feedback. In this case, the feedback scheme may be seen as a third rich feedback on sub-block level, in addition to the RLC feedback (on PDU level) and the HARQ (on data block level). When the message block 10 is split into sub-blocks Si,..., Si,..., SN and each sub-block Si then encoded separately, this is an extension of RLC in terms of a third feedback loop, where the feedback loop provides information on the sub-block level. It is noted that the feedback scheme of the present disclosure maybe combined with other feedback schemes as well, for example ARQ.
However, it is noted that the present disclosure is not limited to this particular scenario or radio access technology. Figure 5 is a more general illustration, wherein instead of the above communication device 8 a receiving device 11 is providing the rich feedback of the present disclosure. The above eNodeB 5 as transmitting part may correspondingly more generally be seen as a transmitting device 12. The receiving device 11 and the transmitting device 12 may for example be devices of a D2D scenario wherein the devices are communicating with each other. Then typically, both devices are alternately the receiving part and transmitting part. That is, both devices are capable of providing rich feedback according to an aspect of the present disclosure, as well as capable of retransmissions according to received rich feedback. Aspects of the present disclosure are thus applicable to any radio link.
Figure 6 illustrates a flow chart over steps of a method 20 in a receiving device 11, 8 in accordance with the present disclosure. The method 20 of providing feedback may be performed in a receiving device 11, 8, e.g. as the one described in relation to figures 4 and 5. The receiving device 11, 8 is capable of wireless communication with a transmitting device 12, 5. When the receiving device 11 comprises a communication device 5 of a communication system, the communication system 1 may, but need not, implement a first feedback scheme, e.g. a HARQ scheme for providing feedback of a message block 10.
The method 20 comprises receiving 21, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub- blocks, Si, SN.
The method 20 comprises decoding 22 the received N sub-blocks, Si, SN. The decoding may be done in a conventional way. If the message block 10 was encoded in the transmitting device 12, 5 in one single code word, and subsequently split into N sub-blocks, then the decoding 11 is performed in reverse order, i.e. first reassemble (or join) the N sub-blocks and then decode the message block 10. If the message block 10 was, in the transmitting device 12, 5, first split into sub-blocks and each sub-block encoded separately, then the decoding 22 is performed by decoding each sub-block and then reassemble the sub-blocks to the message block 10.
The method 20 comprises detecting 23 at least one and less than N sub-blocks being erroneously decoded. The detecting 23 may for example be performed by the decoder calculating a probability of error of a certain sub-block. The method 20 comprises providing 24 feedback information to the transmitting device 12, 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks. The feedback that is provided is thus on a sub-block level and not at the level of the entire message block. For example, if implemented in the scenario of figure 5, the communication system 1 may implement a first feedback scheme, as mentioned earlier, then the feedback provided by the method 20
comprises feedback on a sub-block level to this first feedback scheme, which is on the entire message block level. In an embodiment, the method 20 comprises receiving 24, from the transmitting device 12, 5, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneous. The delay between the first transmission and the second transmission may be shorter compared to prior art, since the transmitting device 12, 5 may transmit only the relevant parts of the initially sent message block 10, the relevant parts being the parts that the receiving device 11, 8 did not decode correctly. The receiving device 11, 8 receiving such retransmission has now an increased chance of decoding the message block 10 correctly.
In an embodiment, the providing 24 comprises transmitting a feedback signal comprising a sequence of N symbols, each symbol of the sequence indicating whether corresponding sub-block was decoded correctly or erroneously.
In a variation of the above embodiment, the sequence comprises a binary sequence and each symbol comprises a binary symbol.
In a variation of the above embodiment, a bit set to 1 indicates that the corresponding sub-block was received erroneously, and wherein a bit set to o indicates that the corresponding sub-block was decoded correctly; or wherein a bit set to o indicates that the corresponding sub-block was decoded erroneously, and wherein a bit set to 1 indicates that the corresponding sub-block was decoded correctly.
In an embodiment, the providing 24 comprises transmitting a feedback signal comprising an indication of a first erroneously decoded sub-block or a first erroneously decoded bit of a sub-block.
In an embodiment, the providing 24 comprises transmitting feedback information comprising a soft-value for each sub-block, Si, SN.
In an embodiment, the providing 24 comprises transmitting feedback information comprising a soft-value for each bit of each sub-block, Si, SN.
In an embodiment, the method 20 comprises compressing the feedback information and the providing 24 feedback information then comprises transmitting the compressed feedback information. An advantage of this embodiment is the reduced need of communication resources. In an embodiment, a hybrid automatic repeat request, HARQ, feedback scheme is performed for the encoded message block 10, and the providing 24 feedback information comprises providing feedback on a sub-block level of the HARQ feedback scheme. This embodiment may be seen as a HARQ feedback scheme with rich feedback information, i.e. the richness comprising the indication of errors on sub- block level.
Figure 7 illustrates schematically a receiving device 11, 8 and means for implementing methods of the present disclosure. The receiving device 11, 8 comprises a processor 30 comprising any combination of one or more of a central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit etc. capable of executing software instructions stored in a memory 31, which can thus be a computer program product 31. The processor 30 can be configured to execute any of the various embodiments of the method as described e.g. in relation to figure 6.
The receiving device 11, 8 comprises receiving and transmitting means, as indicated schematically at reference numeral 33. The receiving device 11, 8 further comprises encoder/decoder 34 and modulator/demodulator 35 so as to be able to receive, demodulate and decode a received message block 10.
A data memory (not illustrated) may also be provided for reading and/or storing data during execution of software instructions in the processor 30. Such data memory can be any combination of read and write memory (RAM) and read only memory (ROM).
The receiving device 11, 8 may be any type of device able to communicate wirelessly with the transmitting device 12, 5, it may for example be a smart phone, a user equipment, a laptop computer, handheld device etc. The receiving device 11, 8 may comprise still further components, not illustrated, for example user input device, display etc.
The receiving device 11, 8 may be configured to perform any of the embodiments of the method as has been described. The receiving device 11, 8 is capable of wireless communication with a transmitting device 5. For example, the communication device 8 capable of such wireless communication may comprise transmitting and receiving means 33 and be configured for wireless communication using the particular radio air interface implemented in a communication system l in which it is configured to operate. The receiving device 11, 8 comprises a processor 30 and memory 31, the memory 31 containing instructions executable by the processor 30, whereby the receiving device 11, 8 is operative to:
- receive, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN
- decode the received N sub-blocks, Si, SN,
- detect at least one and less than N sub-blocks being erroneously decoded, and
- provide feedback information to the transmitting device 12, 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
In an embodiment, the receiving device 11, 8 is further operative to:
- receive, from the transmitting device 12, 5, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneous.
In an embodiment, the receiving device 11, 8 is configured to provide by transmitting a feedback signal comprising a sequence of N symbols, each symbol of the sequence indicating whether corresponding sub-block was decoded correctly or erroneously.
In a variation of the above embodiment the sequence comprises a binary sequence and each symbol comprises a binary symbol. In other embodiments, other
"alphabets" or bases than the binary one is used, and the symbols may e.g. in a hexadecimal alphabet comprise a hexadecimal symbol, in a decimal alphabet the symbols comprise a decimal symbol, etc. Any base may thus be used for the sequence indicating errors on a sub-block level.
In a variation of the above embodiment the receiving device 11, 8 is configured to indicate by a bit set to 1 that the corresponding sub-block was received erroneously, and to indicate by a bit set to o that the corresponding sub-block was decoded correctly; or configured to indicate by a bit set to o that the corresponding sub-block was decoded erroneously, and operative to indicate by a bit set to 1 that the corresponding sub-block was decoded correctly.
In variations of the above two embodiments, the receiving device 11, 8 is configured to provide by transmitting a feedback signal comprising an indication of a first erroneously decoded sub-block or a first erroneously decoded bit of a sub-block.
In an embodiment, the receiving device n, 8 is configured to provide by transmitting feedback information comprising a soft-value for each sub-block, Si, SN.
In an embodiment, the receiving device n, 8 is configured to provide by transmitting feedback information comprising a soft-value for each bit of each sub-block, Si, SN.
In an embodiment, the receiving device n, 8 is configured to compress the feedback information and configured to provide by transmitting the compressed feedback information.
In an embodiment, the receiving device n, 8 is configured to perform a hybrid automatic repeat request, HARQ, feedback scheme for the encoded message block 10, and configured to provide feedback on a sub-block level of the HARQ feedback scheme.
In an embodiment, the message block comprises a Packet Data Unit of a Radio Link Control Protocol.
The present disclosure also encompasses a computer program product 31 comprising a computer program 32 for implementing the embodiments of the method as have been described, and a computer readable means on which the computer program 32 is stored. The computer program product 31 may be any combination of read and write memory (RAM) or read only memory (ROM). The computer program product 31 may also comprise persistent storage, which for example can be any single one or combination of magnetic memory, optical memory or solid state memory.
The present disclosure thus comprises a computer program 32 for a receiving device 11, 8, wherein the receiving device 11, 8 is capable of wireless communication with a transmitting device 12, 5. The computer program 32 comprises computer program code, which, when run on the receiving device 11, 8 causes the receiving device n, 8 to:
- receive, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN,
- decode the received N sub-blocks, Si, SN,
- detect at least one and less than N sub-blocks being erroneously decoded, and
- provide feedback information to the transmitting device 12, 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
The computer program product 31, or the memory, thus comprises instructions executable by the processor 30. Such instructions may be comprised in a computer program 32, or in one or more software modules or function modules.
An example of an implementation using function modules and/ or software modules is illustrated in figure 8, in particular illustrating a receiving device 11, 8 comprising such means for implementing embodiments of the described method. The receiving device 11, 8 is capable of wireless communication with a transmitting device 12, 5, and comprises first means, e.g. a first functional module, 41 for receiving, from the transmitting device 12, 5, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN.
The receiving device 11, 8 comprises second means, e.g. a second functional module, 42 for decoding the received N sub-blocks, Si, SN.
The receiving device 11, 8 comprises third means, e.g. a third functional module, 43 for detecting at least one and less than N sub-blocks being erroneously decoded.
The receiving device 11, 8 comprises fourth means, e.g. a fourth functional module, 44 for providing feedback information to the transmitting node 5, the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks. The receiving device 11, 8 may comprise still additional means, e.g. means for receiving, from the transmitting device 12, 5, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneous. Still other means may further be provided, e.g.
transmitting means.
Figure 9 illustrates a flow chart over steps of a method 20 in a transmitting device 12, 5 in accordance with the present disclosure. The method 40 of retransmission is performed in a transmitting device 12, 5, the transmitting device 12, 5 being capable of wireless communication with a receiving device 11, 8. An example of such transmitting device 11, 5 comprises a base station providing wireless communication to the receiving device 11, 8. The method 40 comprises transmitting 41, to the receiving device 11, 8, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN. AS mentioned earlier, the transmitting device 12, 5 may encode the message block 10 in one single code word, which is then split into N sub-blocks and transmitted. Alternatively, the transmitting device 12, 5 may split the message block 10 into N sub-blocks and encode each sub-block separately.
The method 40 comprises receiving 42, from the receiving device 11, 8, feedback information indicating at least one and less than N erroneously decoded sub-blocks.
The method 40 comprises transmitting 43, to the receiving device 11, 8, a
retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded. Instead of using processing capacity and time on retransmitting the entire message block 10, the transmitting device 12, 5 may resend only the parts of the message block 10 that are indicated in the feedback signal as erroneously decoded. The method thus provides reduced delay as well as reduced need of processing capacity and processing time.
Figure 10 illustrates schematically a transmitting device 12, 5 and means for implementing methods of the present disclosure. The transmitting device 12, 5 comprises a processor 50 comprising any combination of one or more of a central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit etc. capable of executing software instructions stored in a memory 51, which can thus be a computer program product 51. The processor 50 can be configured to execute the method as described e.g. in relation to figure 9.
The transmitting device 12, 5 comprises receiving and transmitting means, as indicated schematically at reference numeral 53. The transmitting device 12, 5 may for example be a base station node, or a transmitting device in a D2D
communication, and comprise any further component conventionally used in such nodes and devices. The transmitting device 12, 5 may for example comprise signal processing circuitry, scheduler, antenna controlling devices, user interfaces, input devices, etc.
The transmitting device 12, 5 is capable of wireless communication with a receiving device 11, 8. The transmitting device 12, 5 comprises a processor 50 and memory 51, the memory 51 containing instructions executable by the processor 50, whereby the transmitting device 12, 5 is operative to:
- transmit, to the receiving device 11, 8, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN,
- receive, from the receiving device 11, 8, feedback information indicating at least one and less than N erroneously decoded sub-blocks, and
- transmit, to the receiving device 11, 8, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback
information as erroneously decoded.
The present disclosure also encompasses a computer program product 51 comprising a computer program 52 for implementing the method as has been described, and a computer readable means on which the computer program 52 is stored. The computer program product 51 maybe any combination of read and write memory (RAM) or read only memory (ROM). The computer program product 51 may also comprise persistent storage, which for example can be any single one or combination of magnetic memory, optical memory or solid state memory.
The present disclosure thus comprises a computer program 52 for a transmitting device 11, 5, the transmitting device 11, 5 being capable of wireless communication with a receiving device 8. The computer program 52 comprises computer program code, which, when run on the transmitting device 12, 5 causes the transmitting device 12, 5 to:
- transmit, to the receiving device 11, 8, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN,
- receive, from the receiving device 11, 8, feedback information indicating at least one and less than N erroneously decoded sub-blocks, and
- transmit, to the receiving device 11, 8, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback
information as erroneously decoded.
An example of an implementation using function modules and/ or software modules is illustrated in figure 11, in particular illustrating a transmitting device 12, 5 comprising such means for implementing embodiments of the described method.
The transmitting device 12, 5 is capable of wireless communication with a receiving device 11, 8, and comprises first means, e.g. a first functional module, 61 for transmitting, to the receiving device 11, 8, an encoded message block 10, the message block 10 comprising a number N of sub-blocks, Si, SN.
The transmitting device 12, 5 comprises second means, e.g. a second functional module, 62 for receiving, from the receiving device 11, 8, feedback information indicating at least one and less than N erroneously decoded sub-blocks.
The transmitting device 12, 5 comprises third means, e.g. a third functional module, for transmitting, to the receiving device 11, 8, a retransmission of parts of the message block 10, the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
The transmitting device 12, 5 may comprise still additional means (not illustrated).
The invention has mainly been described herein with reference to a few
embodiments. However, as is appreciated by a person skilled in the art, other embodiments than the particular ones disclosed herein are equally possible within the scope of the invention, as defined by the appended patent claims.

Claims

Claims
1. A method (20) of providing feedback performed in a receiving device (11, 8) being capable of wireless communication with a transmitting device (12, 5), the method (20) comprising:
- receiving (21), from the transmitting device (12, 5), an encoded message block (10), the message block (10) comprising a number N of sub-blocks, Si, SN,
- decoding (22) the received N sub-blocks, Si, SN,
- detecting (23) at least one and less than N sub-blocks being erroneously decoded, and
- providing (24) feedback information to the transmitting device (12, 5), the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
2. The method (20) as claimed in claim 1, comprising:
- receiving (24), from the transmitting device (12, 5), a retransmission of parts of the message block (10), the retransmission comprising the sub-blocks indicated in the feedback information as erroneous.
3. The method (20) as claimed in claim 1 or 2, wherein the providing (24) comprises transmitting a feedback signal comprising a sequence of N symbols, each symbol of the sequence indicating whether corresponding sub-block was decoded correctly or erroneously.
4. The method (20) as claimed in claim 3, wherein the sequence comprises a binary sequence and each symbol comprises a binary symbol.
5. The method (20) as claimed in claim 4, wherein a bit set to 1 indicates that the corresponding sub-block was received erroneously, and wherein a bit set to o indicates that the corresponding sub-block was decoded correctly; or wherein a bit set to o indicates that the corresponding sub-block was decoded erroneously, and wherein a bit set to 1 indicates that the corresponding sub-block was decoded correctly.
6. The method (20) as claimed in claim 1 or 2, wherein the providing (24) comprises transmitting a feedback signal comprising an indication of a first erroneously decoded sub-block or a first erroneously decoded bit of a sub-block.
7. The method (20) as claimed in any of claims 1-3, wherein the providing (24) comprises transmitting feedback information comprising a soft-value for each sub- block, Si, SN.
8. The method (20) as claimed in any of claims 1-3, wherein the providing (24) comprises transmitting feedback information comprising a soft-value for each bit of each sub-block, Si, SN.
9. The method (20) as claimed in any of the preceding claims, comprising
compressing the feedback information and wherein the providing (24) comprises transmitting the compressed feedback information.
10. The method (20) as claimed in any of the preceding claims, wherein a hybrid automatic repeat request, HARQ, feedback scheme is performed for the encoded message block (10), and wherein the providing (24) comprises providing feedback on a sub-block level of the HARQ feedback scheme.
11. A receiving device (11, 8) for providing feedback, the receiving device (11, 8) being capable of wireless communication with a transmitting device (12, 5), the receiving device (11, 8) comprising a processor (30) and memory (31), the memory (31) containing instructions executable by the processor (30), whereby the receiving device (11, 8) is operative to:
- receive, from the transmitting device (12, 5), an encoded message block (10), the message block (10) comprising a number N of sub-blocks, Si, SN
- decode the received N sub-blocks, Si, SN,
- detect at least one and less than N sub-blocks being erroneously decoded, and
- provide feedback information to the transmitting device (12, 5), the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
12. The receiving device (n, 8) as claimed in claim n, further being operative to:
- receive, from the transmitting device (12, 5), a retransmission of parts of the message block (10), the retransmission comprising the sub-blocks indicated in the feedback information as erroneous.
13. The receiving device (11, 8) as claimed in claim 11 or 12, configured to provide by transmitting a feedback signal comprising a sequence of N symbols, each symbol of the sequence indicating whether corresponding sub-block was decoded correctly or erroneously.
14. The receiving device (11, 8) as claimed in claim 13, wherein the sequence comprises a binary sequence and each symbol comprises a binary symbol.
15. The receiving device (11, 8) as claimed in claim 14, configured to indicate by a bit set to 1 that the corresponding sub-block was received erroneously, and to indicate by a bit set to o that the corresponding sub-block was decoded correctly; or configured to indicate by a bit set to o that the corresponding sub-block was decoded
erroneously, and operative to indicate by a bit set to 1 that the corresponding sub- block was decoded correctly.
16. The receiving device (11, 8) as claimed in claim 11 or 12, configured to provide by transmitting a feedback signal comprising an indication of a first erroneously decoded sub-block or a first erroneously decoded bit of a sub-block.
17. The receiving device (11, 8) as claimed in any of claims 11-13, configured to provide by transmitting feedback information comprising a soft-value for each sub- block, Si, SN.
18. The receiving device (11, 8) as claimed in any of claims 11-13, configured to provide by transmitting feedback information comprising a soft-value for each bit of each sub-block, Si, SN.
19. The receiving device (11, 8) as claimed in any of claims 11-18, configured to compress the feedback information and configured to provide by transmitting the compressed feedback information.
20. The receiving device (n, 8) as claimed in any of claims 11-19, configured to perform a hybrid automatic repeat request, HARQ, feedback scheme for the encoded message block (10), and configured to provide feedback on a sub-block level of the HARQ feedback scheme.
21. The receiving device (11, 8) as claimed in any claims 11-20, wherein the message block comprises a Packet Data Unit of a Radio Link Control Protocol.
22. A computer program (32) for a receiving device (11, 8), the receiving device (11, 8) being capable of wireless communication with a transmitting device (12, 5), the computer program (32) comprising computer program code, which, when run on the receiving device (11, 8) causes the receiving device (11, 8) to:
- receive, from the transmitting device (12, 5), an encoded message block (10), the message block (10) comprising a number N of sub-blocks, Si, SN,
- decode the received N sub-blocks, Si, SN,
- detect at least one and less than N sub-blocks being erroneously decoded, and
- provide feedback information to the transmitting device (12, 5), the feedback information indicating the at least one and less than N sub-blocks detected as erroneously decoded sub-blocks.
23. A computer program product (31) comprising a computer program (32) as claimed in claim 22, and a computer readable means on which the computer program (32) is stored.
24. A method (40) of retransmission performed in a transmitting device (12, 5), the transmitting device (12, 5) being capable of wireless communication with a receiving device (11, 8), the method (40) comprising:
- transmitting (41), to the receiving device (11, 8), an encoded message block (10), the message block (10) comprising a number N of sub-blocks, Si, SN,
- receiving (42), from the receiving device (11, 8), feedback information indicating at least one and less than N erroneously decoded sub-blocks, and - transmitting (43), to the receiving device (11, 8), a retransmission of parts of the message block (10), the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
25. A transmitting device (12, 5) for retransmission, the transmitting device (12, 5) being capable of wireless communication with a receiving device (11, 8), the transmitting device (12, 5) comprising a processor (50) and memory (51), the memory (51) containing instructions executable by the processor (50), whereby the transmitting device (12, 5) is operative to:
- transmit, to the receiving device (11, 8), an encoded message block (10), the message block (10) comprising a number N of sub-blocks, Si, SN,
- receive, from the receiving device (11, 8), feedback information indicating at least one and less than N erroneously decoded sub-blocks, and
- transmit, to the receiving device (11, 8), a retransmission of parts of the message block (10), the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
26. A computer program (52) for a transmitting device (12, 5), the transmitting device (12, 5) being capable of wireless communication with a communication device (8), the computer program (52) comprising computer program code, which, when run on the transmitting device (12, 5) causes the transmitting device (12, 5) to:
- transmit, to the receiving device (11, 8), an encoded message block (10), the message block (10) comprising a number N of sub-blocks, Si, SN,
- receive, from the receiving device (11, 8), feedback information indicating at least one and less than N erroneously decoded sub-blocks, and
- transmit, to the receiving device (11, 8), a retransmission of parts of the message block (10), the retransmission comprising the sub-blocks indicated in the feedback information as erroneously decoded.
27. A computer program product (51) comprising a computer program (52) as claimed in claim 26, and a computer readable means on which the computer program (52) is stored.
PCT/SE2014/050305 2014-03-12 2014-03-12 Method and devices for providing feedback in a communication system WO2015137854A1 (en)

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WO2021007796A1 (en) * 2019-07-17 2021-01-21 Nokia Shanghai Bell Co., Ltd. Integrated signaling of harq acknowledgements

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US20100023832A1 (en) * 1999-07-02 2010-01-28 Nokia Corporation Data acknowledgement
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US20100023832A1 (en) * 1999-07-02 2010-01-28 Nokia Corporation Data acknowledgement
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* Cited by examiner, † Cited by third party
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WO2021007796A1 (en) * 2019-07-17 2021-01-21 Nokia Shanghai Bell Co., Ltd. Integrated signaling of harq acknowledgements
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