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CN-115462005-B - Acquisition and reporting of channel and interference measurements

CN115462005BCN 115462005 BCN115462005 BCN 115462005BCN-115462005-B

Abstract

Mechanisms for channel measurement and interference measurement acquisition are provided. A method implemented by a network node. The method includes configuring a terminal device to implement and report channel measurements for a first set of reference signal resources and interference measurements for a second set of reference signal resources. The method includes transmitting the first set of reference signal resources and the second set of reference signal resources. The method comprises receiving a report of the channel measurements and the interference measurements from the terminal device. The interference measurement is reported as a function of measurements of at least two reference signal resources in the second set of reference signal resources.

Inventors

  • M. Frenne
  • S. Faxwell
  • A. NELSON

Assignees

  • 瑞典爱立信有限公司

Dates

Publication Date
20260505
Application Date
20200513

Claims (20)

  1. 1. A method for channel measurement and interference measurement acquisition, the method being implemented by a network node (200), the method comprising: Configuring (S104) a first terminal device (300 a) to implement and report channel measurements for a first set of reference signal resources and interference measurements for a second set of reference signal resources; transmitting (S106) the first set of reference signal resources in a first set of beams and the second set of reference signal resources in a second set of beams; Receiving (S108) a report of the channel measurements and the interference measurements from the first terminal device (300 a), wherein the interference measurements are reported as a function of measurements on at least two reference signal resources of the second set of reference signal resources, and Based on the reporting of the interference measurements, an interference level for the first terminal device (300 a) due to selecting a beam from the second set of beams for data and/or control signaling to a second terminal device (300 b) is estimated (S112).
  2. 2. The method of claim 1, wherein the channel measurement and the interference measurement are reported as a combined link quality metric.
  3. 3. The method according to claim 1 or 2, wherein the network node (200) configures the first terminal device (300 a) to report the interference measurement as a function of measurements of at least two reference signal resources of the second set of reference signal resources.
  4. 4. The method of claim 1 or 2, wherein the report indicates how different interference between different reference signal resources in the second set of reference signal resources is.
  5. 5. The method according to claim 1 or 2, wherein the first terminal device (300 a) is configured by the network node (200) to receive the first set of reference signal resources and the second set of reference signal resources using one spatial receiver filter identical to that during reception of data and/or control signaling.
  6. 6. The method of claim 1 or 2, wherein each reference signal resource of the first set of reference signal resources is transmitted in its own beam of the first set of beams.
  7. 7. The method of claim 6, further comprising: Based on the reporting of the channel measurements, one of the beams in the first set of beams is selected (S110) for data and/or control signaling for the first terminal device (300 a).
  8. 8. The method of claim 7, wherein selecting which beam of the first set of beams is further based on a report received from a second terminal device (300 b) regarding interference measurements performed by the second terminal device (300 b) on reference signal resources of the first set of reference signal resources.
  9. 9. The method of claim 1 or 2, wherein each reference signal resource of the second set of reference signal resources is transmitted in its own beam of the second set of beams.
  10. 10. The method of claim 1 or 2, further comprising: -receiving (S102) from the first terminal device (300 a) an acknowledgement that the first terminal device (300 a) is capable of performing measurements and reporting the measurements as configured by the network node (200).
  11. 11. The method of claim 1 or 2, wherein each of the channel measurements and the interference measurements is represented or accompanied by CRI and RSRP values determined for the first and second sets of reference signal resources.
  12. 12. The method according to claim 1 or 2, wherein which of the first set of reference signal resources the first terminal device (300 a) is to report channel measurements for and which of the first set of reference signal resources the first terminal device (300 a) is to report interference measurements for are based on reports received from the first terminal device (300 a) regarding beam scanning performed by the network node (200).
  13. 13. A method for channel measurement and interference measurement reporting, the method being implemented by a terminal device (300 a), the method comprising: -receiving (S204) from the network node (200) a configuration to implement and report channel measurements for a first set of reference signal resources and interference measurements for a second set of reference signal resources; Receiving (S206) the first set of reference signal resources transmitted in a first set of beams and the second set of reference signal resources transmitted in a second set of beams, and performing channel measurements on the first set of reference signal resources and interference measurements on the second set of reference signal resources; Providing (S210) a report of the channel measurements and the interference measurements to the network node (200), wherein the interference measurements are reported as a function of measurements on at least two reference signal resources of the second set of reference signal resources, and Beam weights are determined (S208) based on the channel measurements and the interference measurements.
  14. 14. The method of claim 13, wherein the channel measurements and the interference measurements are reported as a combined link quality metric.
  15. 15. The method according to claim 13 or 14, wherein the terminal device (300 a) is configured by the network node (200) to report the interference measurement as a function of measurements of at least two reference signal resources of the second set of reference signal resources.
  16. 16. The method of claim 13 or 14, wherein the reported interference measurement is determined as a linear average of measured powers of the at least two reference signal resources in the second set of reference signal resources.
  17. 17. The method of claim 13 or 14, wherein the interference measurement is reported as a function of measurements of all reference signal resources in the second set of reference signal resources.
  18. 18. The method of claim 13 or 14, wherein the report indicates how different interference between different reference signal resources in the second set of reference signal resources is.
  19. 19. The method of claim 18, wherein how interference between different reference signal resources in the second set of reference signal resources differs is indicated by a report comprising a variance value of the interference measurement.
  20. 20. The method of claim 18, wherein how interference between different reference signal resources in the second set of reference signal resources differs is indicated by a report comprising a highest interference measurement for the second set of reference information resources.

Description

Acquisition and reporting of channel and interference measurements Technical Field Embodiments presented herein relate to a method, a network node, a computer program and a computer program product for channel measurement and interference measurement acquisition. Embodiments presented herein also relate to a method, a terminal device, a computer program and a computer program product for channel measurement and interference measurement reporting. Background In a communication network, it may be a challenge to obtain good performance and capacity for a given communication protocol, its parameters, and the physical environment in which the communication network is deployed. For example, for future generations of mobile communication networks, frequency bands at many different carrier frequencies may be required. For example, a lower such frequency band may be required to achieve adequate network coverage for the wireless device, and a higher frequency band (e.g., at millimeter wavelengths (mmW), i.e., near and above 30 GHz) may be required to achieve the desired network capacity. In general, at high frequencies, the propagation characteristics of the radio channel are more challenging, and beamforming may be required at both the network node of the network and at the wireless device to achieve a sufficient link budget. At such high frequencies, a narrow beam transmission and reception scheme may be required to compensate for the expected high propagation loss. For a given communication link, the corresponding beam may be applied at both the network end (represented by the network node or its transmission and reception points TRP) and the terminal (represented by the terminal device), which is commonly referred to as beam-pair link (BPL). It is contemplated that measurements of downlink reference signals, such as channel state information reference signals (CSI-RS) or Synchronization Signal Block (SSB) signals for beam management, are used by the network to discover and monitor BPL (i.e., both the beams used by the network nodes and the beams used by the terminal devices). One purpose of MU-MIMO is to serve multiple terminal devices simultaneously with the same time, frequency and code resources, thereby increasing the capacity of the communication network. If the network node has multiple antenna panels, it may implement MU-MIMO transmission, e.g., from each antenna panel to one terminal device. In order to achieve significant capacity gains with MU-MIMO, low interference between co-scheduled terminal devices should be ensured. This may be achieved by making accurate CSI available at the network node to facilitate interference nulling in precoding (primarily for digital antenna arrays), and/or by co-scheduling terminal devices with near-orthogonal channels. An example of the latter is if two terminal devices are in line of sight and the angular separation is larger than the beam width of the antenna panel. In this case, both terminal devices may be co-scheduled by the network node transmitting with a beam directed from one antenna panel to the first terminal device and transmitting with a beam directed from the other antenna panel to the second terminal device. To enable MU-MIMO for a network node with an analog antenna panel, the network node should determine a beam for transmission for each respective terminal device that keeps inter-device interference low while maintaining a strong signal for each terminal device and in this way obtain a high signal-to-interference-and-noise ratio (SINR) for all co-scheduled terminal devices. The beam management process may be used for discovery and maintenance of BPL. In some aspects, the beam management process is defined in terms of a P-1 sub-process, a P-2 sub-process, and a P-3 sub-process. CSI-RSs for beam management may be transmitted periodically, semi-statically, or aperiodically (event triggered), they may be shared among multiple terminal devices, or may be device-specific. SSBs are sent periodically and shared for all terminal devices. In order for the terminal device to find the appropriate network node beam, the network node transmits the reference signal in a P-1 sub-process with a different Transmit (TX) beam on which the terminal device performs measurements, such as Reference Signal Received Power (RSRP), and reports back the N best TX beams (where N is configurable by the network). Furthermore, the transmission of reference signals on a given TX beam may be repeated to allow the terminal device to evaluate the appropriate Receive (RX) beam. The reference signal shared between all terminal devices served by the TRP may be used to determine the first coarse direction of the terminal device. The use of SSB as a reference signal may be applicable to such periodic TX beam scanning at TRP. One reason for this is that SSBs are in any case periodically transmitted (for initial access/synchronization purposes) and SSBs are also expected to beamform at higher fre