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EP-4022809-B1 - ENHANCEMENTS FOR CBG-BASED HARQ FEEDBACK AND OVERHEAD REDUCTION IN NEW RADIO

EP4022809B1EP 4022809 B1EP4022809 B1EP 4022809B1EP-4022809-B1

Inventors

  • FEHRENBACH, THOMAS
  • POPP, JULIAN
  • SRINIVASAN, Nithin
  • GÖKTEPE, Baris
  • HELLGE, CORNELIUS
  • WIRTH, THOMAS
  • SCHIERL, THOMAS
  • Hassan Hussein, Khaled Shawky
  • LEYH, MARTIN
  • HEYN, THOMAS
  • NIEMANN, BERNHARD

Dates

Publication Date
20260513
Application Date
20200827

Claims (15)

  1. An apparatus (300, 302 1 -302 n ) for a wireless communication system (100), wherein the apparatus (300, 302 1 -302 n ) is configured to use a plurality of frequency bands (SB1-SB4) for a communication with one or more network entities in the wireless communication system (100), wherein the apparatus (300, 302 1 -302 n ) is configured to receive from the one or more network entities a transport block, TB, the TB being split into a plurality of code block groups, CBGs, each CBG including one or more code blocks, CBs, and being confined to one of the plurality of frequency bands (SB1-SB4), and wherein the apparatus (300, 302 1 -302 n ) is to provide a feedback or a predicted feedback for each of the CBGs indicating one or more of a successful receipt of the CBG, a non-successful receipt of the CBG, no need for redundancy for the CBG, a need for some redundancy for the CBG, and an amount of additional redundancy needed, characterized in that the apparatus (300, 302 1 -302 n ) is configured to compress the feedbacks and/or the predicted feedbacks for each of the CBGs into a compressed feedback based on an interference pattern on one or more of the frequency bands (SB1-SB4) which is detected at the apparatus (300, 302 1 -302 n ) and to transmit to the one or more of the network entities the compressed feedback.
  2. The apparatus (300, 302 1 -302 n ) of claim 1, wherein, to compress the feedbacks and/or the predicted feedbacks, the apparatus (300, 302 1 -302 n ) is to apply a lossless compression scheme or a lossy compression scheme, or a frequency band based compression, or semi-lossy compression.
  3. The apparatus (300, 302 1 -302 n ) of any one of the preceding claims, wherein a successful receipt of the CBG is indicated by a first value, and a non-successful receipt of the CBG is indicated by a second value.
  4. The apparatus (300, 302 1 -302 n ) of claim 3, wherein, to compress the feedbacks or the predicted feedbacks, the apparatus (300, 302 1 -302 n ) is to apply a variable length code book, the codebook including codes identifying some or all patterns of ACKs and NACKs for the plurality of CBGs, the length of a code increasing with the number of NACKs in case ACKs have a higher probability than NACKs, or increasing with the number of ACKs in case NACKs have a higher probability than ACKs
  5. The apparatus (300, 302 1 -302 n ) of claim 3, wherein, to compress the feedbacks or the predicted feedbacks, the apparatus (300, 302 1 -302 n ) is to represent the feedback or the predicted feedback for each frequency band (SB1-SB4) by one value, the one value having the first value in case all of the CBGs in a frequency band (SB1-SB4) are or are predicted to be successfully received, or the second value in case one of the CBGs in a frequency band (SB1-SB4) is or is predicted to be not successfully received.
  6. The apparatus (300, 302 1 -302 n ) of claim 3, wherein, to compress the feedbacks or the predicted feedbacks, the apparatus (300, 302 1 -302 n ) is configured with a certain number of feedback values to transmit the feedbacks or the predicted feedbacks, the certain number of bits being less than a maximum number of CBGs possible in the TB.
  7. The apparatus (300, 302 1 -302 n ) of claim 6, wherein the apparatus (300, 302 1 -302 n ) is to rearrange a mapping of the feedback values using a pre-defined set of rules.
  8. The apparatus (300, 302 1 -302 n ) of claim 6 or 7, wherein in case there is a sufficient number of feedback values, the apparatus (300, 302 1 -302 n ) is to represent the feedback or the predicted feedback for each CBG by one value, the one value having the first value in case the CBG is or is predicted to be successfully received, or the second value in case the CBG is or is predicted to be not successfully received, and wherein, in case there is an insufficient number of feedback values, the apparatus (300, 302 1 -302 n ) is to represent the feedback or the predicted feedback for each frequency band (SB1-SB4) by one value, the one value having the first value in case all of the CBGs in a frequency band (SB1-SB4) are successfully received, or the second value in case one of the CBGs in a frequency band (SB1-SB4) is not successfully received.
  9. The apparatus (300, 302 1 -302 n ) of any one of claims 6 to 8, wherein in case of a failure of one or more of the frequency bands (SB1-SB4), the apparatus (300, 302 1 -302 n ) is to - represent the feedback or the predicted feedback for each failed frequency band (SB1-SB4) by one value, the one value indicating that all of the CBGs in the failed frequency band (SB1-SB4) are not successfully received, or - represent the feedback or the predicted feedback for each CBG in the one or more failed frequency bands (SB1-SB4) by one value, the one value indicating that the CBG is not successfully received.
  10. The apparatus (300, 302 1 -302 n ) of any one of claims 6 to 9, wherein a failure of one or more of the frequency bands (SB1-SB4) is due to an interference in a frequency band (SB1-SB4) exceeding a certain threshold or another channel condition not meeting a certain criterion, or one or more or all of the plurality of frequency bands (SB1-SB4) are unlicensed subbands on which a communication is allowed for a certain transmission time, COT, responsive to a successful Listen-Before-Talk, LBT, and a failure of one or more of the frequency bands (SB1-SB4) is due to a failed LBT for one or more of the unlicensed subbands.
  11. The apparatus (300, 302 1 -302 n ) of any one of the preceding claims, wherein one or more or all of the frequency bands (SB1-SB4) are unlicensed subbands, and wherein - following a successful Listen-Before-Talk, LBT, for one or more unlicensed subbands, a communication is allowed during a certain transmission time in an available unlicensed subband. - following a failed Listen-Before-Talk, LBT, for one or more unlicensed subbands, a communication is not allowed in a non-available unlicensed subband.
  12. The apparatus (300, 302 1 -302 n ) of any one of the preceding claims, wherein the apparatus (302 1 -302 n ) comprises a user device, UE, wherein the UE comprises one or more of a mobile terminal, or a stationary terminal, or a cellular IoT-UE, or a vehicular UE, or a vehicular group leader, GL, UE, or an IoT, or a narrowband loT, NB-loT, device, or a WiFi non Access Point STAtion, non-AP STA, or a ground based vehicle, or an aerial vehicle, or a drone, or a moving base station, or a road side unit, or a building, or any other item or device provided with network connectivity enabling the item/device to communicate using the wireless communication network, and/or the apparatus (300) comprises a base station, BS, wherein the BS is implemented as mobile or immobile base station and comprises one or more of a macro cell base station, or a small cell base station, or a central unit of a base station, or a distributed unit of a base station, or a road side unit, or a UE, or a group leader, GL, or a relay, or a remote radio head, or an AMF, or an SMF, or a core network entity, or mobile edge computing entity, or a network slice as in the NR or 5G core context, or a WiFi AP STA, or any transmission/reception point, TRP, enabling an item or a device to communicate using the wireless communication network, the item or device being provided with network connectivity to communicate using the wireless communication network.
  13. A wireless communication system (100), comprising one or more user devices and one or more base station, wherein one or more of the user devices and/or one or more of the base stations comprise an apparatus (300, 302 1 -302 n ) of any one of the preceding claims.
  14. A method for providing feedback in a wireless communication system (100), the method comprising: receiving, by a receiver, from one or more network entities in the wireless communication system (100), a transport block, TB, using a plurality of frequency bands (SB1-SB4), the TB being split into a plurality of code block groups, CBGs, each CBG including one or more code blocks, CBs, and being confined to one of the plurality of frequency bands (SB1-SB4), and providing or a feedback or a predicted feedback for each of the CBGs indicating one or more of a successful receipt of the CBG, a non-successful receipt of the CBG, no need for redundancy for the CBG, a need for some redundancy for the CBG, and an amount of additional redundancy needed, characterized by compressing the feedbacks and/or the predicted feedbacks for each of the CBGs into a compressed feedback based on an interference pattern on one or more of the frequency bands (SB1-SB4) which is detected at the receiver and transmitting to the one or more of the network entities the compressed feedback.
  15. A computer program product comprising instructions which, when the program is executed by a computer, causes the computer to carry the method in accordance with claim 14.

Description

The present application relates to the field of wireless communication systems or networks, more specifically to enhancements in the communication among network entities of the communication network when performing a communication using a plurality of frequency bands, some or all of which may include frequency bands in the unlicensed spectrum. Embodiments of the present invention concern enhancements in the feedback mechanism for reporting successful/non-successful transmissions of data or no need for redundancy for the data or a need for some redundancy for the data or an amount of additional redundancy needed for the data in a multi-band operation, for example, improvements for the hybrid automatic repeat request, HARQ, feedback. Fig. 1 is a schematic representation of an example of a terrestrial wireless network 100 including, as is shown in Fig. 1(a), a core network 102 and one or more radio access networks RAN1, RAN2, ... RANN. Fig. 1(b) is a schematic representation of an example of a radio access network RANn that may include one or more base stations gNB1 to gNB5, each serving a specific area surrounding the base station schematically represented by respective cells 1061 to 1065. The base stations are provided to serve users within a cell. The one or more base stations may serve users in licensed and/or unlicensed bands. The term base station, BS, refers to a gNB in 5G networks, an eNB in UMTS/LTE/LTE-A/ LTE-A Pro, or just a BS in other mobile communication standards. A user may be a stationary device or a mobile device. The wireless communication system may also be accessed by mobile or stationary IoT devices which connect to a base station or to a user. The mobile devices or the IoT devices may include physical devices, ground based vehicles, such as robots or cars, aerial vehicles, such as manned or unmanned aerial vehicles (UAVs), the latter also referred to as drones, buildings and other items or devices having embedded therein electronics, software, sensors, actuators, or the like as well as network connectivity that enables these devices to collect and exchange data across an existing network infrastructure. Fig. 1(b) shows an exemplary view of five cells, however, the RANn may include more or less such cells, and RANn may also include only one base station. Fig. 1(b) shows two users UE1 and UE2, also referred to as user equipment, UE, that are in cell 1062 and that are served by base station gNB2. Another user UE3 is shown in cell 1064 which is served by base station gNB4. The arrows 1081, 1082 and 1083 schematically represent uplink/downlink connections for transmitting data from a user UE1, UE2 and UE3 to the base stations gNB2, gNB4 or for transmitting data from the base stations gNB2, gNB4 to the users UE1, UE2, UE3. This may be realized on licensed bands or on unlicensed bands. Further, Fig. 1(b) shows two IoT devices 1101 and 1102 in cell 1064, which may be stationary or mobile devices. The loT device 1101 accesses the wireless communication system via the base station gNB4 to receive and transmit data as schematically represented by arrow 1121. The loT device 1102 accesses the wireless communication system via the user UE3 as is schematically represented by arrow 1122. The respective base station gNB1 to gNB5 may be connected to the core network 102, e.g. via the S1 interface, via respective backhaul links 1141 to 1145, which are schematically represented in Fig. 1(b) by the arrows pointing to "core". The core network 102 may be connected to one or more external networks. Further, some or all of the respective base station gNB1 to gNB5 may connected, e.g. via the S1 or X2 interface or the XN interface in NR, with each other via respective backhaul links 1161 to 1165, which are schematically represented in Fig. 1(b) by the arrows pointing to "gNBs". For data transmission a physical resource grid may be used. The physical resource grid may comprise a set of resource elements to which various physical channels and physical signals are mapped. For example, the physical channels may include the physical downlink, uplink and sidelink shared channels (PDSCH, PUSCH, PSSCH) carrying user specific data, also referred to as downlink, uplink and sidelink payload data, the physical broadcast channel (PBCH) carrying for example a master information block (MIB) and a system information block (SIB), the physical downlink, uplink and sidelink control channels (PDCCH, PUCCH, PSSCH) carrying for example the downlink control information (DCI), the uplink control information (UCI) and the sidelink control information (SCI). For the uplink, the physical channels may further include the physical random access channel (PRACH or RACH) used by UEs for accessing the network once a UE synchronized and obtained the MIB and SIB. The physical signals may comprise reference signals or symbols (RS), synchronization signals and the like. The resource grid may comprise a frame or radio frame having a certain duration i