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EP-4278515-B1 - DYNAMIC SWITCHING BETWEEN MULTI-TRANSMISSION RECEPTION POINT AND SINGLE-TRANSMISSION RECEPTION POINT

EP4278515B1EP 4278515 B1EP4278515 B1EP 4278515B1EP-4278515-B1

Inventors

  • DEGHEL, Matha
  • LADDU, Keeth Saliya Jayasinghe
  • YUK, YOUNGSOO

Dates

Publication Date
20260513
Application Date
20211216

Claims (15)

  1. A method, to be carried out at a user equipment (10), the method comprising: receiving (300), from a base station (20), a first indication in a downlink control information; determining (305), based on the first indication, whether to apply a multi-transmission reception point physical uplink shared channel scheme or a single-transmission reception point physical uplink shared channel scheme; interpreting (310) at least one field of the downlink control information differently depending on whether it is determined that the single-transmission reception point physical uplink shared channel scheme or the multi-transmission reception point physical uplink shared channel scheme is applicable; receiving, from the base station (20), a second indication, the method being characterised in that wherein the second indication indicates, when the single-transmission reception point physical uplink shared channel scheme is applicable, a sounding reference signal resource set index, and the method further comprises determining which sounding reference signal resource set to use based on the received second indication; and wherein the second indication indicates, when the multi-transmission reception point physical uplink shared channel scheme is applicable, an order of sounding reference signal resource sets to use, and the method further comprises determining the order of sounding reference signal resource sets to use based on the received second indication.
  2. The method according to claim 1, wherein the first indication and the second indication are received in a same field of the downlink control information.
  3. The method according to claim 1 or claim 2, wherein when the single-transmission reception point physical uplink shared channel scheme is applicable, the at least one field of the downlink control information is interpreted by at least one of: considering a subfield of the at least one field of the downlink control information, and determining a parameter value based on the subfield.
  4. The method according to claim 3, wherein when the at least one field of the downlink control information comprises a first sounding reference signal resource indicator field and a second sounding reference signal resource indicator field, the subfield is the first sounding reference signal resource indicator field or the second sounding reference signal resource indicator field; when the at least one field of the downlink control information comprises a first precoding information and number of layers field and a second precoding information and number of layers field, the subfield is the first precoding information and number of layers field or the second precoding information and number of layers field; when the at least one field of the downlink control information comprises a first transmit power control command field and a second transmit power control command field, the subfield is the first transmit power control command field or the second transmit power control command field; when the at least one field of the downlink control information comprises a first phase tracking reference signal-demodulation reference signal association field and a second phase tracking reference signal-demodulation reference signal association field, the subfield is the first phase tracking reference signal-demodulation reference signal association field or the second phase tracking reference signal-demodulation reference signal association field; when the at least one field of the downlink control information comprises a single phase tracking reference signal-demodulation reference signal association field, the subfield is a part of the phase tracking reference signal-demodulation reference signal association field.
  5. The method according to any of the preceding claims, wherein the at least one field of the downlink control information comprises at least one of: a first sounding reference signal resource indicator field, a second sounding reference signal resource indicator field, a first precoding information and number of layers field, a second precoding information and number of layers field, a first transmit power control command field, a second transmit power control command field, a first phase tracking reference signal-demodulation reference signal association field, and a second phase tracking reference signal-demodulation reference signal association field.
  6. The method according to any of claims 1-3, wherein when the multi-transmission reception point physical uplink shared channel scheme is applicable, the at least one downlink control information field is interpreted by at least one of: considering the whole at least one downlink control information field, and determining two parameter values based on the whole at least one downlink control information field.
  7. The method according to any of the preceding claims, wherein when the multi-transmission reception point physical uplink shared channel scheme is applicable, the method comprises determining the order of sounding reference signal resource sets to use by determining whether to start with a value corresponding to a first or a second sounding reference signal resource set.
  8. A user equipment (10), comprising: means for receiving (15), from a base station (20), a first indication in a downlink control information; means for determining (12), based on the first indication, whether to apply a multi-transmission reception point physical uplink shared channel scheme or a single-transmission reception point physical uplink shared channel scheme; means for interpreting (12) at least one field of the downlink control information differently depending on whether it is determined that the single-transmission reception point physical uplink shared channel scheme or the multi-transmission reception point physical uplink shared channel scheme is applicable; means for receiving, from the base station (20), a second indication, the user equipment (10) being characterised in that wherein the second indication indicates, when the single-transmission reception point physical uplink shared channel scheme is applicable, a sounding reference signal resource set index, and the user equipment (10) further comprises means for determining which sounding reference signal resource set to use based on the received second indication; and wherein the second indication indicates, when the multi-transmission reception point physical uplink shared channel scheme is applicable, an order of sounding reference signal resource sets to use, and the user equipment (10) further comprises means for determining the order of sounding reference signal resource sets to use based on the received second indication.
  9. The user equipment (10) according to claim 8, wherein the first indication and the second indication are received in a same field of the downlink control information.
  10. The user equipment (10) according to claim 8 or claim 9, wherein when the multi-transmission reception point physical uplink shared channel scheme is applicable, the user equipment (10) comprises: means for determining the order of sounding reference signal resource sets to use by determining whether to start with a value corresponding to a first or a second sounding reference signal resource set.
  11. The user equipment (10) according to any of claim 8-10, wherein when the single-transmission reception point physical uplink shared channel scheme is applicable, the at least one field of the downlink control information is interpreted by at least one of: considering a subfield of the at least one field of the downlink control information, and determining a parameter value based on the subfield.
  12. The user equipment (10) according to claim 11, wherein when the at least one field of the downlink control information comprises a first sounding reference signal resource indicator field and a second sounding reference signal resource indicator field, the subfield is the first sounding reference signal resource indicator field or the second sounding reference signal resource indicator field; when the at least one field of the downlink control information comprises a first precoding information and number of layers field and a second precoding information and number of layers field, the subfield is the first precoding information and number of layers field or the second precoding information and number of layers field; when the at least one field of the downlink control information comprises a first transmit power control command field and a second transmit power control command field, the subfield is the first transmit power control command field or the second transmit power control command field; when the at least one field of the downlink control information comprises a first phase tracking reference signal-demodulation reference signal association field and a second phase tracking reference signal-demodulation reference signal association field, the subfield is the first phase tracking reference signal-demodulation reference signal association field or the second phase tracking reference signal-demodulation reference signal association field; when the at least one field of the downlink control information comprises a single phase tracking reference signal-demodulation reference signal association field, the subfield is a part of the phase tracking reference signal-demodulation reference signal association field.
  13. The user equipment (10) according to any of claims 8-12, wherein the at least one field of the downlink control information comprises at least one of: a first sounding reference signal resource indicator field, a second sounding reference signal resource indicator field, a first precoding information and number of layers field, a second precoding information and number of layers field, a first transmit power control command field, a second transmit power control command field, a first phase tracking reference signal-demodulation reference signal association field, and a second phase tracking reference signal-demodulation reference signal association field.
  14. The user equipment (10) according to any of claims 8-13, wherein when the multi-transmission reception point physical uplink shared channel scheme is applicable, the at least one downlink control information field is interpreted by at least one of: considering the whole at least one downlink control information field, and the user equipment (10) further comprises: means for determining two parameter values based on the whole at least one downlink control information field.
  15. A base station (20), comprising: means for transmitting (25), toward a user equipment (10), a first indication in a downlink control information; wherein the first indication enables the user equipment (10) to determine whether to apply a multi-transmission reception point physical uplink shared channel scheme or a single-transmission reception point physical uplink shared channel scheme; and wherein the first indication further enables the user equipment (10) to interpret at least one field of the downlink control information differently depending on whether it is determined that the single-transmission reception point physical uplink shared channel scheme or the multi-transmission reception point physical uplink shared channel scheme is applicable; means for transmitting a second indication, toward the user equipment (20), wherein the second indication indicates, when the single-transmission reception point physical uplink shared channel scheme is applicable, a sounding reference signal resource set index; and wherein the second indication indicates, when the multi-transmission reception point physical uplink shared channel scheme is applicable, an order of sounding reference signal resource sets to use.

Description

FIELD: Some example embodiments may generally relate to mobile or wireless telecommunication systems, such as Long Term Evolution (LTE) or fifth generation (5G) radio access technology or new radio (NR) access technology, or other communications systems. For example, certain example embodiments may relate to apparatuses, systems, and/or methods for enabling dynamic switching between multi-transmission reception point and single-transmission reception point. BACKGROUND: Examples of mobile or wireless telecommunication systems may include the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), Long Term Evolution (LTE) Evolved UTRAN (E-UTRAN), LTE-Advanced (LTE-A), MulteFire, LTE-A Pro, and/or fifth generation (5G) radio access technology or new radio (NR) access technology. Fifth generation (5G) wireless systems refer to the next generation (NG) of radio systems and network architecture. 5G is mostly built on a new radio (NR), but the 5G (or NG) network can also build on E-UTRAN radio. It is estimated that NR will provide bitrates on the order of 10-20 Gbit/s or higher, and will support at least enhanced mobile broadband (eMBB) and ultra-reliable low-latency-communication (URLLC) as well as massive machine type communication (mMTC). NR is expected to deliver extreme broadband and ultra-robust, low latency connectivity and massive networking to support the Internet of Things (IoT). With IoT and machine-to-machine (M2M) communication becoming more widespread, there will be a growing need for networks that meet the needs of lower power, low data rate, and long battery life. It is noted that, in 5G, the nodes that can provide radio access functionality to a user equipment (i.e., similar to Node B in UTRAN or eNB in LTE) are named gNB when built on NR radio and named NG-eNB when built on E-UTRAN radio. US 2020/267748 A1 presents dynamic switching between different multi-transmission/reception point schemes. US 2020/351841 A1 presents a dynamic transmission reception point group indication. WO 2021/209979 A1 (considered only under Art. 94(3) EPC) presents a method and a device for simultaneous transmission to multiple transmission and reception points (TRPs). WO 2022/029979 A1 (considered only under Art. 94(3) EPC) presents a reception unit that receives at least one item of downlink control information (DCI) for a plurality of physical uplink shared channels (PUSCHs), and a control unit that controls the transmission of the PUSCHs on the basis of an expanded precoding information and number of layers field included in the DCI, wherein the control unit assumes that the number of antenna ports is set independently for each of the plurality of PUSCHs. SUMMARY: The invention is set out in the appended set of claims. BRIEF DESCRIPTION OF THE DRAWINGS: For proper understanding of example embodiments, reference should be made to the accompanying drawings, wherein: FIG. 1 illustrates an example of a user equipment (UE) flow diagram, according to certain example embodiments.FIG. 2 illustrates an example of another UE flow diagram, according to certain example embodiments.FIG. 3 illustrates a flow diagram of a method, according to certain example embodiments.FIG. 4(a) illustrates an apparatus, according to certain example embodiments.FIG. 4(b) illustrates another apparatus, according to certain example embodiments. DETAILED DESCRIPTION: Techniques are described herein for enabling dynamic switching between multi-transmission reception point (multi-TRP) and single-transmission reception point (single-TRP). The features, structures, or characteristics of example embodiments described throughout this specification may be combined in any suitable manner in one or more example embodiments. For example, the usage of the phrases "certain embodiments," "an example embodiment," "some embodiments," or other similar language, throughout this specification refers to the fact that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment. Thus, appearances of the phrases "in certain embodiments," "an example embodiment," "in some embodiments," "in other embodiments," or other similar language, throughout this specification do not necessarily refer to the same group of embodiments, and the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. In physical uplink shared channel (PUSCH) multi-antenna precoding modes, a user equipment (UE) may be configured in two different modes. For example, the UE may be configured in codebook-based transmission or non-codebook-based transmission. For the codebook-based dynamic grant (DG) PUSCH, the UE may determine a sounding reference signal (SRS) resource indicator (SRI) and transmit precoding-matrix indicator (TPMI) information (via precoding information and number of layers) from the corresponding fields in the