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EP-4742571-A1 - PDCCH TRANSMISSION REPETITIONS

EP4742571A1EP 4742571 A1EP4742571 A1EP 4742571A1EP-4742571-A1

Abstract

Example embodiments of the present disclosure provide a solution for physical downlink control channel (PDCCH) transmission repetitions. In an example method, a terminal device receives a configuration for at least one common search space. The terminal device monitors, according to the configuration, at least one PDCCH candidate for decoding downlink control information (DCI). The terminal device determine, based on an indication in association with the at least one PDCCH candidate, that PDCCH transmission repetition is enabled.

Inventors

  • FREDERIKSEN, FRANK
  • MARCONE, Alessio
  • AHMADZADEH, Arman
  • BI, Bo

Assignees

  • Nokia Technologies Oy

Dates

Publication Date
20260513
Application Date
20250930

Claims (20)

  1. A terminal device comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to: receive, from a network device, a configuration for at least one common search space; monitor, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI); and determine, based on an indication in association with the at least one PDCCH candidate, that PDCCH transmission repetition is enabled.
  2. The terminal device of claim 1, wherein the terminal device is further caused to: determine a reference point, wherein the reference point is used for indicating a starting PDCCH monitoring occasion (MO) among a set of PDCCH MOs during which at least one PDCCH transmission in association with the ongoing PDCCH transmission repetition is transmitted.
  3. The terminal device of claim 2, wherein the reference point is relative to a start of the at least one common search space.
  4. The terminal device of claim 3, wherein the reference point is at least one of the following: a first PDCCH MO in the at least one common search space; a PDCCH MO among even-numbered PDCCH MOs in the at least one common search space; a PDCCH MO among odd-numbered PDCCH MOs in the at least one common search space; or a PDCCH MO in every k*p slots, wherein k is an integer and p is a slot periodicity of the at least one common search space.
  5. The terminal device of claim 2, wherein the PDCCH transmission repetition is used for scheduling random access response (RAR) or message 4 (MSG4), and the reference point is relative to a start of a RAR window or a start of a contention resolution timer.
  6. The terminal device of claim 5, wherein the reference point is aligned with the start of the RAR window or the start of the contention resolution timer.
  7. The terminal device of claim 1, wherein the terminal device is further caused to: determine a scheduling offset between at least one PDCCH transmission in association with the PDCCH transmission repetition and a start of at least one physical downlink shared channel (PDSCH) transmission, wherein one of the following: the at least one PDSCH transmission includes a single PDSCH transmission, and the start of the at least one PDSCH transmission is a slot of the single PDSCH transmission; or the at least one PDSCH transmission includes PDSCH repetitions, and the start of the at least one PDSCH transmission is a first slot of a first PDSCH repetition among the PDSCH repetitions.
  8. The terminal device of claim 7, wherein the scheduling offset is a slot offset between a last PDCCH transmission in association with the PDCCH transmission repetition and the start of the at least one PDSCH transmission.
  9. The terminal device of claim 7, wherein the scheduling offset is a slot offset between a first PDCCH transmission in association with the PDCCH transmission repetition and the start of the at least one PDSCH transmission.
  10. The terminal device of claim 7, wherein the PDCCH transmission repetition is defined by a bitmap including multiple bits corresponding to multiple PDCCH candidates, and the scheduling offset is a slot offset between a slot that contains a last symbol of a last PDCCH transmission in association with the PDCCH transmission repetition and the start of the at least one PDSCH transmission.
  11. The terminal device of claim 7, wherein the PDCCH transmission repetition is determined at least based on a first search space set and a second search space set among sets of the at least one common search space, and the scheduling offset is a slot offset between the following: a slot that contains a minimum of a last symbol of a PDCCH transmission in association with the PDCCH transmission repetition in the first search space set and a last symbol of a PDCCH transmission in association with the PDCCH transmission repetition in the second search space set, and the start of the at least one PDSCH transmission.
  12. The terminal device of claim 7, wherein the PDCCH transmission repetition is determined at least based on a first search space set and a second search space set among sets of the at least one common search space, and the scheduling offset is a slot offset between the following: a slot during which a PDCCH transmission in association with the PDCCH transmission repetition in the first search space set is transmitted, and the start of the at least one PDSCH transmission.
  13. The terminal device of any of claims 1-12, wherein the indication is at least one of the following: a flag conveyed by at least one bit in the DCI; or time-frequency characteristics of the at least one PDCCH candidate.
  14. A network device comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to: transmit, to a terminal device, a configuration for at least one common search space; and transmit, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI), wherein the at least one PDCCH candidate is in association with an indication for indicating that PDCCH transmission repetition is enabled.
  15. The network device of claim 14, wherein the network device is further caused to: transmit a scheduling offset between at least one PDCCH transmission in association with the PDCCH transmission repetition and a start of at least one physical downlink shared channel (PDSCH) transmission, wherein one of the following: the at least one PDSCH transmission includes a single PDSCH transmission, and the start of the at least one PDSCH transmission is a slot of the single PDSCH transmission; or the at least one PDSCH transmission includes PDSCH repetitions, and the start of the at least one PDSCH transmission is a first slot of a first PDSCH repetition among the PDSCH repetitions.
  16. The network device of claim 15, wherein the scheduling offset is a slot offset between a last PDCCH transmission in association with the PDCCH transmission repetition and the start of the at least one PDSCH transmission.
  17. The network device of claim 15, wherein the scheduling offset is a slot offset between a first PDCCH transmission in association with the PDCCH transmission repetition and the start of the at least one PDSCH transmission.
  18. The network device of claim 15, wherein the PDCCH transmission repetition is defined by a bitmap including multiple bits corresponding to multiple PDCCH candidates, and the scheduling offset is a slot offset between a last PDCCH transmission in association with the PDCCH transmission repetition and the start of the at least one PDSCH transmission.
  19. The network device of claim 15, wherein the PDCCH transmission repetition is determined at least based on a first search space set and a second search space set among sets of the at least one common search space, and the scheduling offset is a slot offset between the following: a slot that contains a minimum of a last symbol of a PDCCH transmission in association with the PDCCH transmission repetition in the first search space set and a last symbol of a PDCCH transmission in association with the PDCCH transmission repetition in the second search space set, and the start of the at least one PDSCH transmission.
  20. The network device of claim 15, wherein the PDCCH transmission repetition is determined at least based on a first search space set and a second search space set among sets of the at least one common search space, and the scheduling offset is a slot offset between the following: a slot during which a PDCCH transmission in association with the PDCCH transmission repetition in the first search space set is transmitted, and the start of the at least one PDSCH transmission.

Description

FIELD Various example embodiments relate to the field of communication, and in particular, to devices, methods, apparatuses, and a computer readable medium for physical downlink control channel (PDCCH) transmission repetitions. BACKGROUND A communication network can be seen as a facility that enables communications between two or more communication devices, or provides communication devices access to a data network. A mobile or wireless communication network is one example of a communication network. Such communication networks operate in accordance with standards, such as those promulgated by 3GPP (Third Generation Partnership Project) or ETSI (European Telecommunications Standards Institute). Examples of such standards include the so-called 5G (5th Generation) standard or other standards promulgated by 3GPP. SUMMARY In general, example embodiments of the present disclosure provide a solution for PDCCH transmission repetitions, especially for PDCCH transmission repetition in a non-terrestrial network (NTN). In a first aspect, there is provided a terminal device. The terminal device comprises at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to: receive, from a network device, a configuration for at least one common search space; monitor, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI); and determine, based on an indication in association with the at least one PDCCH candidate, that PDCCH transmission repetition is enabled. In a second aspect, there is provided a network device. The network device comprises at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to: transmit, to a terminal device, a configuration for at least one common search space; and transmit, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI), wherein the at least one PDCCH candidate is in association with an indication for indicating that PDCCH transmission repetition is enabled. In a third aspect, there is provided a method. The method comprises: receiving, from a network device, a configuration for at least one common search space; monitoring, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI); and determining, based on an indication in association with the at least one PDCCH candidate, that PDCCH transmission repetition is enabled. In a fourth aspect, there is provided a method. The method comprises: transmitting, to a terminal device, a configuration for at least one common search space; and transmitting, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI), wherein the at least one PDCCH candidate is in association with an indication for indicating that PDCCH transmission repetition is enabled. In a fifth aspect, there is provided an apparatus. The apparatus comprises: means for receiving, from a network device, a configuration for at least one common search space; means for monitoring, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI); and means for determining, based on an indication in association with the at least one PDCCH candidate, that PDCCH transmission repetition is enabled. In a sixth aspect, there is provided an apparatus. The apparatus comprises: means for transmitting, to a terminal device, a configuration for at least one common search space; and means for transmitting, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI), wherein the at least one PDCCH candidate is in association with an indication for indicating that PDCCH transmission repetition is enabled. In a seventh aspect, there is provided a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least method of the above third aspect or fourth aspect. In an eighth aspect, there is provided a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus to perform at least the method of the above third aspect or fourth aspect. In a ninth aspect, there is provided a terminal device. The terminal device comprises: receiving circuitry configured to receive, from a network device, a configuration for at least one common search space; monitoring circuitry configured to monitor, according to the configuration, at least one physical downlink control channel (PDCCH) candidate for decoding downlink control information (DCI);