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BR-112019008988-B1 - Method performed by a first user device, first user device, method performed by a base station, and base station.

BR112019008988B1BR 112019008988 B1BR112019008988 B1BR 112019008988B1BR-112019008988-B1

Abstract

METHODS, BASE STATION AND UE FOR HARQ SIGNALING FOR UNCONCESSIONED UPLINK TRANSMISSIONS In a wireless communication system, an unconcessioned uplink transmission is an uplink transmission sent from a user equipment (UE) to a base station that does not require an explicit dynamic scheduling grant from the base station. Systems and methods are disclosed to perform hybrid automatic repeat request (HARQ) for unconcessioned uplink transmissions. Signaling related to ACK/NACK for HARQ, as well as signaling related to UE configuration for unconcessioned uplink transmission, is also disclosed.

Inventors

  • Yu Cao
  • Liqing Zhang
  • Jianglei Ma

Assignees

  • HUAWEI TECHNOLOGIES CO., LTD

Dates

Publication Date
20260317
Application Date
20171101
Priority Date
20171031

Claims (20)

  1. 1. Method performed by a first user equipment, UE, characterized in that it comprises: transmitting (462) a transport block (TB) to a base station in an uplink transmission without concession, the TB associated with a Hybrid Automatic Repeat Request (HARQ) process identifier (ID); receiving (472) a HARQ return message having a payload that includes multiple positions, wherein there is a mapping between each of the multiple positions and a respective different HARQ process ID for the UE, wherein each of the multiple positions includes an acknowledgment (ACK) indication or a negative acknowledgment (NACK) corresponding to the respective different HARQ process ID for the UE, and wherein the first time the ACK or NACK indication for the TB is received by the UE is after a period of time since an initial transmission without concession of the TB or a last repetition of repetitions of the TB ends, the period of time being configured via Radio Resource Control (RRC) signaling.
  2. 2. Method, according to claim 1, characterized in that each position of the multiple positions includes a bit indicating an ACK or a NACK for a respective different TB.
  3. 3. A method according to claim 1 or 2, characterized in that it further comprises the UE transmitting multiple TBs to the base station, each TB of the multiple TBs corresponding to a different HARQ process ID, and wherein each of the multiple positions provides the HARQ return for a respective different of the multiple TBs transmitted by the UE.
  4. 4. A method according to claim 1 or 2, characterized in that receiving the HARQ return message comprises receiving downlink control information (DCI).
  5. 5. A method, according to any one of claims 1 to 4, characterized in that the DCI is associated with a UE ID and a cyclic redundancy check (CRC) field of the DCI is masked with the UE ID.
  6. 6. A method, according to any one of claims 1 to 5, characterized in that an uplink time-frequency resource for uplink transmission without concession is configured, by RRC signaling, without a concession in the downlink control information (DCI).
  7. 7. First user equipment, UE, characterized in that it comprises: a transmitter for transmitting a transport block (TB) to a base station in an uplink transmission without concession, the TB associated with a Hybrid Automatic Repeat Request (HARQ) process identifier (ID); a receiver for receiving a HARQ return message having a payload that includes multiple positions, wherein there is a mapping between each of the multiple positions and a respective different HARQ process ID for the UE, wherein each of the multiple positions includes an indication of an acknowledgment (ACK) or a negative acknowledgment (NACK) corresponding to the respective different HARQ process ID for the UE, and wherein the first time the ACK or NACK indication for the TB is received by the UE is after a period of time since an initial transmission without concession of the TB or a last repetition of repetitions of the TB ends, the period of time being configured via Radio Resource Control (RRC) signaling.
  8. 8. Device according to claim 7, characterized in that each position of the multiple positions includes a bit indicating an ACK or a NACK for a respective different TB.
  9. 9. Apparatus, according to claim 7, characterized in that the transmitter must transmit multiple TBs to the base station, each TB of the multiple TBs corresponding to a different HARQ process ID, and in that each of the multiple positions provides the HARQ return for a respective different of the multiple TBs transmitted by the UE.
  10. 10. Device according to claim 7, characterized in that the receiver must receive the HARQ return message in the downlink control information (DCI).
  11. 11. Device according to claim 10, characterized in that the device is a user equipment (UE), the DCI is associated with a UE ID of the UE and a cyclic redundancy check (CRC) field of the DCI is masked with the UE ID.
  12. 12. Apparatus, according to claim 7, characterized in that an uplink time-frequency resource for uplink transmission without concession is configured, by RRC signaling, without a concession in the downlink control information (DCI).
  13. 13. Method performed by a base station, characterized in that it comprises: receiving a transport block (TB) from a user equipment (UE) in an uplink transmission without concession, the TB associated with a Hybrid Automatic Repeat Request (HARQ) process identifier (ID); transmitting a HARQ return message having a payload that includes multiple positions, wherein there is a mapping between each of the multiple positions and a respective different HARQ process ID for the UE, wherein each of the multiple positions includes an indication of an acknowledgment (ACK) or a negative acknowledgment (NACK) corresponding to the respective different HARQ process ID for the UE, and wherein the first time the ACK or NACK indication for the TB is received by the UE is after a period of time since an initial transmission without concession of the TB or a last repetition of repetitions of the TB ends, the time period being configured via RRC radio resource control signaling.
  14. 14. Method, according to claim 13, characterized in that each position of the multiple positions includes a bit indicating an ACK or a NACK for a respective different TB.
  15. 15. Method, according to claim 13, characterized in that it further comprises receiving, by the base station, multiple TBs from the UE, each TB of the multiple TBs corresponding to a different HARQ process ID, and wherein each of the multiple positions provides the HARQ return for a respective different from the multiple TBs transmitted by the UE.
  16. 16. Method according to claim 13, characterized in that transmitting the HARQ return message comprises transmitting downlink control information (DCI).
  17. 17. A method according to claim 13, characterized in that an uplink time-frequency resource for uplink transmission without concession is configured for the UE, by RRC signaling, without a concession in the downlink control information (DCI).
  18. 18. Base station, characterized in that it comprises: a receiver for receiving a transport block (TB) from a user equipment (UE) in an uplink transmission without concession, the TB associated with a Hybrid Automatic Repeat Request (HARQ) process identifier (ID); a transmitter for transmitting a HARQ return message having a payload that includes multiple positions, wherein there is a mapping between each of the multiple positions and a respective different HARQ process ID for the UE, wherein each of the multiple positions includes an indication of an acknowledgment (ACK) or a negative acknowledgment (NACK) corresponding to the respective different HARQ process ID for the UE, and wherein the first time the ACK or NACK indication for the TB is received by the UE is after a period of time since an initial transmission without concession of the TB or a last repetition of repetitions of the TB ends, the time period being configured via RRC radio resource control signaling.
  19. 19. Base station, according to claim 18, characterized in that each position of the multiple positions includes a bit indicating an ACK or a NACK for a respective different TB.
  20. 20. Base station, according to claim 18, characterized in that the receiver must receive multiple TBs from the UE, each TB of the multiple TBs corresponding to a different HARQ process ID, and in which each of the multiple positions provides the HARQ return for a respective different of the multiple TBs.

Description

FIELD [001] This application refers to uplink transmissions without concession. FUNDAMENTALS [002] In some wireless communication systems, a user device (UD) communicates wirelessly with a base station to send data to the base station and receive data from the base station. Wireless communication from an UD to a base station is referred to as uplink communication. Wireless communication from a base station to an UD is called downlink communication. [003] Resources are needed to perform uplink and downlink communications. For example, a UE can wirelessly transmit data to a base station in an uplink transmission at a particular frequency and during a given time interval. The frequency and time interval used are examples of resources. [004] Some wireless communication systems may support grant-based uplink transmissions. That is, if a UE wants to transmit data to a base station, the UE requests uplink resources from the base station. The base station grants the uplink resources, and then the UE sends the uplink transmission using the granted uplink resources. An example of uplink resources that can be granted by the base station is a set of time-frequency locations in an uplink orthogonal frequency division multiple access (OFDMA) frame. [005] Some wireless communication systems may also, or instead, support uplink transmissions without concession. That is, an UE may send uplink transmissions using certain uplink resources possibly shared with other UEs, without specifically requesting the use of the resources and without specifically granting the resources to the base station. An uplink transmission without concession does not require an explicit dynamic scheduling concession from the base station. [006] In some cases, when a UE sends an uplink transmission without concession, the base station may not be able to decode the data in the uplink transmission. SUMMARY [007] Hybrid Auto-Repeat Request (HARQ) is a method in which the data to be transmitted is encoded using an error-correcting code. Then, if the encoded data is corrupted during transmission and the receiver cannot correct the errors, an Auto-Repeat Request (ARQ) will be executed. [008] HARQ signaling for grant-based uplink transmissions may not be available for non-grant uplink transmissions because non-grant uplink transmissions do not receive an explicit scheduling grant from the base station. [009] The systems and methods for performing HARQ for non-concession uplink transmissions are disclosed herein. The ACK/NACK related signaling for HARQ, as well as the signaling related to configuring a UE for non-concession uplink transmission, is also disclosed. [0010] Using the systems and methods described herein, HARQ signaling for non-concession uplink transmissions can therefore be provided. In particular, some aspects below provide support for ACK/NACK return for non-concession transmissions and retransmissions. [0011] In one aspect, a method performed by a base station is provided. The method includes the base station receiving a first uplink transmission without concession from a first UE. The method further includes the base station receiving a second uplink transmission without concession from a second UE. The method also includes transmitting, to the first UE and to the second UE, a group ACK/NACK message indicating an ACK or NACK corresponding to the first uplink transmission without concession and an ACK or NACK corresponding to the second uplink transmission without concession. A base station configured to perform the method is also disclosed. [0012] In another aspect, a method performed by a first UE is provided. The method includes transmitting a first uplink transmission without concession to a base station. The method further includes receiving a group ACK/NACK message indicating an ACK or a NACK corresponding to the first uplink transmission without concession and an ACK or a NACK corresponding to a second uplink transmission without concession from a second UE. A UE to perform the method is also disclosed. BRIEF DESCRIPTION OF THE DRAWINGS [0013] Modalities will be described, by way of example only, with reference to the attached figures, in which: Figure 1 is a block diagram of a base station and a plurality of UEs, according to a modality; Figure 2 is a block diagram showing a base station and UE in more detail, according to a modality; Figure 3 illustrates examples of formats for an uplink transmission without concession; Figures 4 and 5 illustrate tables showing examples of mappings between transmissions and MA signatures or physical resources; Figure 6 is a method performed by a base station, according to a modality; Figure 7 illustrates an example of mapping between the MA signature/access region without concession and the time-frequency/orthogonal return sequence location; Figure 8 is a method performed by a UE and base station, according to a modality; Figure 9 is a method performed by a UE and base station, according to another