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JP-7856819-B2 - Method and apparatus for dynamic spectrum sharing

JP7856819B2JP 7856819 B2JP7856819 B2JP 7856819B2JP-7856819-B2

Inventors

  • エル ハムス、アータ
  • マリニエール、ポール
  • アルファルハン、ファリス
  • プレティエ、ギスラン

Assignees

  • インターデイジタル パテント ホールディングス インコーポレイテッド

Dates

Publication Date
20260511
Application Date
20250519
Priority Date
20200805

Claims (14)

  1. A wireless transmit/receive unit (WTRU) comprising a processor and memory, wherein the processor and memory are A radio resource control (RRC) message is received, and the RRC message includes control information indicating that a transmission performed using a primary cell (PCell) can be scheduled via the PCell or a secondary cell (SCell), and the RRC message includes first search space configuration information associated with the PCell and second search space configuration information associated with the SCell. Determine the maximum number of candidate physical downlink control channels (PDCCHs) to monitor within a slot for scheduling the transmission performed using the PCell. Determine the maximum number of non-overlapping control channel elements (CCEs) to monitor within the slot for scheduling the transmission performed using the PCell, It is determined that for the first slot, a first ratio of the maximum number of PDCCH candidates can be applied to PDCCH monitoring in PCell, and for the first slot, a second ratio of the maximum number of PDCCH candidates can be applied to PDCCH monitoring in SCell. It is determined that for the first slot, the first ratio of the maximum number of non-overlapping CCEs can be applied to PDCCH monitoring in PCell, and for the first slot, the second ratio of the maximum number of non-overlapping CCEs can be applied to PDCCH monitoring in SCell. The first PDCCH transmission is decoded via the SCell, and the first PDCCH transmission is decoded via the SCell, which schedules the first physical downlink shared channel (PDSCH) transmission received via the PCell. Upon receiving a media access control (MAC) control element (CE) indicating the deactivation of the aforementioned SCell, Based on the fact that SCell is deactivated in the second slot for scheduling the transmission which is performed using PCell, it is determined that the maximum number of PDCCH candidates is applicable to PDCCH monitoring in PCell for the second slot. Based on the fact that the SCell is deactivated in the second slot, it is determined that the maximum number of non-overlapping CCEs can be applied to PDCCH monitoring in the PCell for the second slot. The second PDCCH transmission is decoded via the PCell, and the second PDCCH transmission is decoded via the PCell which schedules the second PDSCH transmission received via the PCell. It receives downlink control information (DCI) which includes a bit field indicating which cell to use for physical uplink control channel (PUCCH) transmission. WTRU was configured in this way.
  2. The aforementioned processor and memory are The PCell is monitored using the first ratio of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the PCell, The SCell is monitored using the second ratio of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the SCell. The WTRU according to claim 1, configured as described above.
  3. The aforementioned processor and memory are Send a Hybrid Automated Resend Request (HARQ) Acknowledgment (ACK) or Negative Response (NACK) feedback report. The WTRU according to claim 1, configured as described above.
  4. The aforementioned processor and memory are Reserve or allocate a set of search space indices for a scheduled cell on a scheduled cell. The WTRU according to claim 1, further configured as follows.
  5. The WTRU according to claim 1, wherein the configuration information represents the first ratio of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the PCell.
  6. The WTRU according to claim 5, wherein the configuration information indicates that the first ratio of the maximum number of non-overlapping CCEs is applicable to PDCCH monitoring in the PCell.
  7. The aforementioned processor and memory are The search space is selected in order of priority until the maximum number of non-duplicate CCEs is reached. The WTRU according to claim 1, further configured as follows.
  8. A method carried out by a wireless transmit/receive unit (WTRU), wherein the method is: Receiving a Radio Resource Control (RRC) message, wherein the RRC message includes control information indicating that a transmission performed using a primary cell (PCell) can be scheduled via the PCell or a secondary cell (SCell), and the RRC message includes first search space configuration information associated with the PCell and second search space configuration information associated with the SCell. To determine the maximum number of candidate physical downlink control channels (PDCCHs) to monitor within a slot for scheduling the transmission performed using the PCell, Determining the maximum number of non-overlapping control channel elements (CCEs) to monitor within the slot for scheduling the transmission performed using the PCell, It is determined that for the first slot, a first ratio of the maximum number of PDCCH candidates can be applied to PDCCH monitoring in PCell, and a second ratio of the maximum number of PDCCH candidates can be applied to PDCCH monitoring in SCell for the first slot, It is determined that for the first slot, the first ratio of the maximum number of non-overlapping CCEs can be applied to PDCCH monitoring in PCell, and for the first slot, the second ratio of the maximum number of non-overlapping CCEs can be applied to PDCCH monitoring in SCell, The first PDCCH transmission is decoded via the SCell, wherein the first PDCCH transmission is decoded via the SCell which schedules a first physical downlink shared channel (PDSCH) transmission received via the PCell. Receiving a media access control (MAC) control element (CE) indicating the deactivation of the aforementioned SCell, Based on the fact that SCell is deactivated in the second slot for scheduling the transmission which is performed using PCell, it is determined that the maximum number of PDCCH candidates is applicable to PDCCH monitoring in PCell for the second slot, Based on the fact that the SCell is deactivated in the second slot, it is determined that the maximum number of non-overlapping CCEs can be applied to PDCCH monitoring in the PCell for the second slot, The second PDCCH transmission is decoded via the PCell, wherein the second PDCCH transmission is decoded via the PCell which schedules the second PDSCH transmission received via the PCell. Receiving Downlink Control Information (DCI) which includes a bit field indicating which cell to use for physical uplink control channel (PUCCH) transmission, Methods that include...
  9. The PCell is monitored using the first ratio of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the PCell, Monitoring the SCell using the second ratio of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the SCell, The method according to claim 8, further comprising:
  10. Sending a Hybrid Automated Resend Request (HARQ) Acknowledgment (ACK) or Negative Response (NACK) Feedback Report, The method according to claim 8, further comprising:
  11. Reserving or allocating a set of search space indices for a scheduled cell on a scheduled cell, The method according to claim 8, further comprising:
  12. The method according to claim 8, wherein the configuration information represents the first ratio of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the PCell.
  13. The method according to claim 12, wherein the configuration information indicates that the first ratio of the maximum number of non-overlapping CCEs is applicable to PDCCH monitoring in the PCell.
  14. Select the search space in order of priority until the maximum number of non-duplicate CCEs is reached. The method according to claim 8, further comprising:

Description

Cross-reference of related applications This application claims the interests of U.S. Provisional Patent Application No. 63/061,611 filed on 5 August 2020, U.S. Provisional Patent Application No. 63/168,080 filed on 30 March 2021, and U.S. Provisional Patent Application No. 63/185,878 filed on 7 May 2021, the contents of which are incorporated herein by reference. New Radio (NR) technology, defined by 3GPP, is designed to provide high flexibility for both control and data channels. For control channels, NR supports different monitoring patterns and different physical downlink control channel (PDCH) locations within a slot. For data channels, NR supports variable transmit duration, start symbols within a slot, and flexible hybrid automatic repeat request (HARQ)-acknowledgement (ACK) feedback timing. The carrier can support wireless transmit-receive units (WTRUs) with different bandwidth capabilities, such as narrowband and wideband devices, using the concept of bandwidth segments. In addition, different carrier spacings can be used simultaneously on the same carrier. For example, a large bandwidth segment may be configured using a large subcarrier spacing (SCS), while a small bandwidth segment may be configured using a smaller SCS, allowing different WTRUs with varying capabilities to coexist on the same spectrum. In NR, it has been proposed to share the spectrum with Long Term Evolution (LTE). Sharing the spectrum with LTE requires the semi-static reservation of physical resources, at least for the LTE control region. This may reduce the capacity of the NR primary cell (PCell) transmitting downlink control signaling, and also reduce the available resources for data within a slot, as the control region should precede the data region. Supporting NR secondary cell (SCell) scheduling for NR PCells would introduce reliability issues for downlink control information. Furthermore, supporting control channels on SCell scheduling data on PCells may prevent the WTRU from simultaneously receiving or monitoring control channels on both cells due to increased blind decoding effort. Therefore, a method is needed for NR to efficiently share the spectrum with LTE. The Wireless Transmit/Receive Unit (WTRU) may be configured to monitor Physical Downlink Control Channel (PDCCH) candidates for primary cells (PCell) and secondary cells (SCell). The WTRU may be configured to determine the duration for the PDCCH candidate budget for a set of symbols based on the subcarrier interval associated with PCell and the subcarrier interval associated with SCell. The WTRU may be configured to determine the maximum number of PDCCH candidates to allocate to the PCell and SCell search space monitoring opportunities. The maximum number of PDCCH candidates may be based on a per-cell ratio. The WTRU may be configured to allocate PDCCH candidates for the PCell and SCell search space monitoring opportunities based on the determined maximum number of PDCCH candidates. The WTRU may be configured to decode the allocated PDCCH candidates. The WTRU may be configured to determine whether there are overlapping PCell and SCell search space monitoring opportunities in the symbol set, and may be configured to determine the maximum number of PDCCH candidates to allocate, provided that there are overlapping search space monitoring opportunities. The ratio per cell may be determined based on the number of configured PDCCH candidates on PCell (N1) and the number of configured downlink control channel candidates on SCell (N2). The maximum number of PDCCH candidates for PCell may be based on the number of configured PDCCH candidates for PCell (N1) as a percentage of the total number of configured PDCCH candidates for PCell and SCell (N1 + N2). The maximum number of PDCCH candidates for SCell may be based on the number of configured PDCCH candidates for SCell (N2) as a percentage of the total number of configured PDCCH candidates for PCell and SCell (N1 + N2). The WTRU may be configured to prioritize the search spaces to monitor based on search space priority or search space index. A more detailed understanding can be obtained from the following description, which is given as an example in conjunction with the attached drawings, where similar reference numbers in the drawings indicate similar elements. This is a system diagram showing an exemplary communication system in which one or more disclosed embodiments may be implemented. This is a system diagram showing an exemplary wireless transmit/receive unit (WTRU) that may be used in the communication system shown in Figure 1A, according to one embodiment. This is a system diagram showing an exemplary radio access network (RAN) and an exemplary core network (CN) that may be used in the communication system shown in Figure 1A according to one embodiment. This is a system diagram showing further exemplary RANs and CNs that may be used in the communication system shown in Figure 1A according to one embodiment. This sec