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BR-112019026880-B1 - COMMUNICATION METHOD, METHOD FOR RECEIVING DATA, AND DEVICE

BR112019026880B1BR 112019026880 B1BR112019026880 B1BR 112019026880B1BR-112019026880-B1

Abstract

This refers to communication methods and systems based on an automatic repeat request, ARQ, scheme and/or ARQ scheme, HARQ, hybrids. The method may comprise: performing an initial data transmission on a dedicated resource in a first channel; simultaneously with the initial data transmission or on a subsequent resource, performing at least one redundant transmission.

Inventors

  • Khaled SHAWKY HASSAN HUSSEIN
  • Thomas Fehrenbach

Assignees

  • KONINKLIJKE PHILIPS N.V

Dates

Publication Date
20260317
Application Date
20180613
Priority Date
20170614

Claims (20)

  1. 1. COMMUNICATION METHOD, according to a hybrid automatic repeat request scheme, HARQ, the method is characterized by comprising: performing a first data transmission (on a first channel that is a first carrier component; on at least one subsequent physical resource for the first data transmission, performing at least one redundant transmission on a second channel that is a second carrier component having lease-free physical resources, wherein the at least one redundancy transmission is performed according to an incremental redundancy for direct error correction, wherein the at least one redundancy transmission is performed using a listen-before-speak scheme, without waiting for an acknowledgment message; completing or deferring the at least one redundant transmission when a stop condition or a deferral condition is met, the stop condition or the deferral condition including at least the reception of an acknowledgment message, ACK, transmitted on a channel that is different from the first and second channels.
  2. 2. METHOD, according to claim 1, characterized in that the first channel comprises dedicated physical resources.
  3. 3. METHOD, according to claim 1, characterized in that the first channel comprises concession-free physical resources.
  4. 4. METHOD, according to claim 1, characterized by further comprising completing or postponing redundant transmission when the stop condition or the postpone condition is met, wherein the stop condition or the postpone condition comprises at least the following condition: other transmissions are transmitted or must be transmitted.
  5. 5. METHOD, according to claim 1, characterized by further comprising completing or postponing redundant transmission when the stopping condition or the postponing condition is met, wherein the stopping condition or the postponing condition comprises at least the following condition: a maximum number of retransmissions has been performed.
  6. 6. METHOD, according to claim 1, characterized by further comprising completing or postponing redundant transmission when the stop condition or the postpone condition is met, wherein the stop condition or the postpone condition comprises at least the following condition: a maximum timer expires.
  7. 7. METHOD, according to claim 1, characterized by further comprising completing or postponing redundant transmission when the stop condition or the postpone condition is met, wherein the stop condition or the postpone condition comprises at least the absence of allocation of at least one subsequent physical resource.
  8. 8. METHOD, according to claim 1, characterized by the stopping condition or the postponement condition comprising at least one of the following conditions or an “OR” condition of at least two of the following conditions: an acknowledgment message, ACK, is received; and/or a maximum number of retransmissions has been performed; and/or a maximum timer has expired; and/or other transmissions are transmitted or must be transmitted; and/or the absence of allocation of at least one subsequent physical resource.
  9. 9. METHOD, according to claim 1, characterized by further comprising: before performing the first data transmission, inserting data to be transmitted into a first transmission buffer associated with the first data transmission; before performing the second data transmission, inserting redundancy data into a second transmission buffer associated with at least one redundant transmission; and evacuating the second transmission buffer when the stop condition or the deferral condition is met.
  10. 10. METHOD, according to claim 1, characterized by using a carrier capture multi-access collision detection technique, CSMA/CD.
  11. 11. METHOD, according to claim 1, characterized by using a carrier capture multiple access collision avoidance technique, CSMA/CA.
  12. 12. METHOD, according to claim 1, characterized by further comprising: performing redundancy transmissions until the deferral condition is met; waiting for a subsequent discarded resource for a redundant transmission; performing at least one additional redundant transmission on the subsequent dedicated resource.
  13. 13. METHOD, according to claim 1, characterized by further comprising: in an initial step, measuring metrics at least in part associated with a network situation to initiate subsequent steps when the metrics are below a threshold.
  14. 14. METHOD, according to claim 1, characterized by further comprising: measuring metrics at least in part associated with a network situation, so as to allocate a greater amount of redundancy transmissions to devices that suffer from not meeting QoS requirements.
  15. 15. METHOD, according to claim 1, characterized by further comprising: measuring metrics at least in part associated with a network situation, so as to allocate a greater amount of redundancy transmissions to devices that request urgent communications.
  16. 16. METHOD, according to claim 1, characterized by further comprising: determining a priority ranking, so as to assign more redundancy transmissions to higher priority transmissions.
  17. 17. METHOD, according to claim 1, characterized in that at least one redundant transmission comprises a plurality of redundancy transmissions transmitted in a plurality of subsequent second-channel features.
  18. 18. METHOD, according to claim 1, characterized by further comprising an automatic request technique, ARQ, of waiting for a non-acknowledgment message, NACK, before performing the retransmission on the same physical resource.
  19. 19. METHOD, according to claim 18, characterized in that the ARQ retransmission is carried out by increasing a power level.
  20. 20. METHOD, according to claim 1, characterized in that at least one of the concession-free features is short time interval transmission, sTTI.

Description

DESCRIPTION FIELD OF TECHNIQUE [01] Technical solutions provided here refer to message transmissions and redundant transmissions, for example, from a base station (BS) to a user device (UE) and/or vice versa. [02] In general terms, an attempt to achieve fast communication between a large number of transmitters/receivers can result in reduced reliability. Consequently, fast retransmissions are necessary. PREVIOUS TECHNIQUE [03] In ultra-low latency communication, on the one hand, pre-programming (e.g., semi-persistent programming (SPS) with very low duty cycle) is a key solution. On the other hand, it is necessary to reduce the time-to-transmit interval (TTI, such as short-TTI), the radio frame size, and the hybrid automatic repeat request (HARQ) retransmission intervals for ultra-low latency communication. [04] Since most ultra-low latency use cases also require high reliability, this poses a major challenge to techniques such as hybrid auto-retry request, HARQ, whose designs are geared toward supporting reduced frame graph and short presentation cycle. [05] Examples below focus on the design of a semi-persistent incremental redundant retransmission for reliable ultra-low latency communication in an open-circuit or near-open-circuit mode. [06] The examples below refer to latency-constrained (mission-critical) communication services, multi-level QoS services, ultra-reliable communication, enhanced multiple access (MA) scheme and MA channels. [07] Technical solutions described here make it possible to increase the reliability of transmissions, and can therefore be used for unreliable communication channels. [08] In the previous technique, attempts were made to increase reliability using the following strategies: • TTI grouping, such as sending the same information multiple times (more than several TTI subframes) as a type of redundancy or diversity (this costs a large delay and is only supported in UL) [6,7] • Using only asynchronous HARQ with short TTI; does not guarantee low latency as sequential retransmission may still occur [1-4] • Saturating the transmission with multiple ACKs or a combined ACK is received for multiple transport blocks. This still induces delay due to latency in response if HARQ can correct too late. Additionally, this is not suitable for SPS with short (or even normal) timeframes. [10] • Providing extra hardware such as retransmitting different frame fragments, but this may not be feasible in mission-critical communication [8]. • HARQ-ACK grouping and multiplexing to feed back multiple frames, still induces latency due to sequential retransmission [11] SUMMARY OF THE INVENTION [09] According to the examples, a communication method, according to an automatic repeat request scheme, ARQ, and/or hybrid ARQ scheme, HARQ, may comprise: • performing a first data transmission; • simultaneously with the first data transmission or on a subsequent physical resource, performing at least one redundant transmission. [10] Consequently, reliability is increased. [11] According to the examples, a method may comprise completing or postponing the retransmission of data when a stopping condition or a postponing condition is met, wherein the stopping condition or the postponing condition comprises at least one of the following conditions or an “OR” condition of at least two of the following conditions: - an acknowledgment message, ACK, is received; - a maximum number of retransmissions has been performed; - a maximum timer has expired; - other transmissions are transmitted or must be transmitted. [12] Consequently, reliability is increased. [13] According to the examples, a method may comprise: - before performing the first data transmission and at least one redundant transmission, inserting data to be transmitted into a first transmission buffer associated with the first data transmission and inserting redundancy data into a second transmission buffer associated with at least one redundant transmission; and - evacuating the second transmission buffer when a stop condition and/or a deferral condition is met. [14] Consequently, it is possible to avoid unnecessary retransmissions with the same strategy that is used to carry out the transmissions. [15] According to the examples, a method may comprise performing at least one redundant transmission according to a fetch combination scheme and/or a redundant forwarding error correction. [16] Consequently, reliability is increased. [17] According to the examples, data transmissions and redundant transmissions are in an uplink, UL, and a method may comprise performing a listen-before-speak scheme or a scheme based on a pickup or detection technique to perform at least one redundant transmission. [18] Consequently, a technique to regulate the means of access between different EUs can be implemented. [19] According to the examples, a method may comprise: - performing redundant transmissions until a deferral condition is met; - waiting for a subsequent resource (dedic