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US-20260128774-A1 - METHODS AND SYSTEMS FOR ADAPTIVE CSI QUANTIZATION

US20260128774A1US 20260128774 A1US20260128774 A1US 20260128774A1US-20260128774-A1

Abstract

A wireless transmit/receive unit (WTRU) is configured to receive configuration information from a network node for the alignment of one or more compressed channel state information (CSI) quantizers at the WTRU and the network node. The configuration information may indicate a plurality of CSI quantization settings and/or criteria for selecting from the plurality of CSI quantization settings. The WTRU may perform one or more CSI measurements on one or more reference signals. The WTRU may encode the one or more CSI measurements. The WTRU may select a CSI quantization setting of the plurality of quantization settings based on the criteria indicated in the configuration information. The WTRU may quantize the encoded one or more CSI measurements using the selected CSI quantization setting. The WTRU may send a feedback report comprising the quantized one or more CSI measurements and/or an indication of the selected CSI quantization setting to the network node.

Inventors

  • Ahmet Serdar Tan
  • Arman Shojaeifard
  • Moon Il Lee
  • Patrick Tooher
  • Yugeswar Deenoo Narayanan Thangaraj
  • Mohamed Salah Ibrahim
  • Ibrahim Hemadeh
  • Mihaela Beluri

Assignees

  • INTERDIGITAL PATENT HOLDINGS, INC.

Dates

Publication Date
20260507
Application Date
20231027

Claims (20)

  1. 1 - 20 . (canceled)
  2. 21 . A wireless transmit/receive unit (WTRU) comprising: a processor and a memory, the processor configured to: receive configuration information from a network node for an alignment of one or more compressed channel state information (CSI) quantizers at the WTRU and at the network node, the configuration information indicating a plurality of CSI quantization settings and criteria to select a CSI quantization setting from the plurality of CSI quantization settings; perform one or more CSI measurements on one or more reference signals; encode the one or more CSI measurements using an auto-encoder; select a CSI quantization setting of the plurality of quantization settings based on the criteria indicated in the configuration information; quantize the encoded one or more CSI measurements using a quantizer, wherein the encoded one or more CSI measurements are quantized based on the selected CSI quantization setting; and send a feedback report to the network node for the alignment of the one or more compressed CSI quantizers, wherein the feedback report comprises the quantized one or more CSI measurements and an indication of the selected CSI quantization setting.
  3. 22 . The WTRU of claim 21 , wherein the criteria are based on one or more of a reference signal received power (RSRP) measurement, a CSI measurement, a type of the feedback report, resources used for sending the feedback report, or a metric associated with the encoded one or more CSI measurements.
  4. 23 . The WTRU of claim 21 , wherein the indication of the selected CSI quantization setting comprises an index of a codebook associated with the plurality of CSI quantization settings.
  5. 24 . The WTRU of claim 21 , wherein the indication of the selected CSI quantization setting comprises and indication of one or more of a quantization type, a quantization parameter, a quantizer granularity, or a resolution of the quantizer.
  6. 25 . The WTRU of claim 24 , wherein the resolution of the quantizer is based on uplink control information (UCI) feedback and a number of encoder outputs.
  7. 26 . The WTRU of claim 21 , wherein the quantizer is configured separately from the auto-encoder.
  8. 27 . The WTRU of claim 21 , wherein the criteria comprise of one or more performance metrics, wherein the metrics comprise at least one of quantization noise or normalized mean square error (NMSE).
  9. 28 . The WTRU of claim 21 , wherein the processor is further configured to: select the number of CSI quantizers, wherein the type of a selected CSI quantizer is uniform, distribution based, or clustering based.
  10. 29 . The WTRU of claim 28 , wherein the WTRU is configured to select the distribution based type when the WTRU computes the distribution of one or more encoder output values using historical samples.
  11. 30 . The WTRU of claim 28 , wherein the WTRU is configured to select the clustering based type when the WTRU computes centroids for one or more encoder output values using historical samples.
  12. 31 . A method implemented by a wireless transmit/receive unit (WTRU), the method comprising: receiving configuration information from a network node for an alignment of one or more compressed channel state information (CSI) quantizers at the WTRU and at the network node, the configuration information indicating a plurality of CSI quantization settings and criteria to select a CSI quantization setting from the plurality of CSI quantization settings; performing one or more CSI measurements on one or more reference signals; encoding the one or more CSI measurements using an auto-encoder; selecting a CSI quantization setting of the plurality of quantization settings based on the criteria indicated in the configuration information; quantizing the encoded one or more CSI measurements using a quantizer, wherein the encoded one or more CSI measurements are quantized based on the selected CSI quantization setting; and sending a feedback report to the network node for the alignment of the one or more compressed CSI quantizers, wherein the feedback report comprises the quantized one or more CSI measurements and an indication of the selected CSI quantization setting.
  13. 32 . The method of claim 31 , wherein the criteria are based on one or more of a reference signal received power (RSRP) measurement, a CSI measurement, a type of the feedback report, resources used for sending the feedback report, or a metric associated with the encoded one or more CSI measurements.
  14. 33 . The method of claim 31 , wherein the indication of the selected CSI quantization setting comprises an index of a codebook associated with the plurality of CSI quantization settings.
  15. 34 . The method of claim 31 , wherein the indication of the selected CSI quantization setting comprises and indication of one or more of a quantization type, a quantization parameter, a quantizer granularity, or a resolution of the quantizer.
  16. 35 . The method of claim 34 , wherein the resolution of the quantizer is based on uplink control information (UCI) feedback and a number of encoder outputs.
  17. 36 . The method of claim 31 , wherein the quantizer is configured separately from the auto-encoder.
  18. 37 . The method of claim 31 , wherein the criteria comprise of one or more performance metrics, wherein the metrics comprise at least one of quantization noise or normalized mean square error (NMSE).
  19. 38 . The method of claim 31 , further comprising: selecting the number of CSI quantizers, wherein the type of a selected CSI quantizer is uniform, distribution based, or clustering based.
  20. 39 . The method of claim 38 , wherein the WTRU is configured to select the distribution based type when the WTRU computes the distribution of one or more encoder output values using historical samples.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Patent Application No. 63/421,865, filed Nov. 2, 2022, the contents of which are incorporated herein by reference in their entirety. BACKGROUND Information compression methods, such as channel state information (CSI) compression, may be studied for future wireless communication systems. CSI data for multiple input multiple output (MIMO) communications to the receiving end may cause large overhead unless efficient compression techniques are used. SUMMARY In examples, methods and/or procedures may be utilized to enable an adaptive quantization process for the output of encoder part of an autoencoder trained for information compression (e.g., channel state information (CSI) compression). Examples may include a configuration of the adaptive (e.g., primary) CSI quantizer, selection and/or determination of related parameters, feedback of the parameters, and/or monitoring and/or reporting of its performance to a receiving end. A wireless transmit/receive unit (WTRU) may receive configuration information from a network node for the alignment of one or more compressed channel state information (CSI) quantizers at the WTRU and at the network node. The configuration information may indicate a plurality of CSI quantization settings and/or criteria for selecting from the plurality of CSI quantization settings. The WTRU may perform one or more CSI measurements on one or more reference signals. The WTRU may encode the one or more CSI measurements. The WTRU may select a CSI quantization setting of the plurality of quantization settings based on the criteria indicated in the configuration information. The WTRU may quantize the encoded one or more CSI measurements using the selected CSI quantization setting. The WTRU may send a feedback report comprising the quantized one or more CSI measurements and/or an indication of the selected CSI quantization setting to the network node for the alignment of the one or more compressed CSI quantizers at the WTRU and the network node. The criteria may be based on one or more of a reference signal received power (RSRP) measurement, a CSI measurement, a type of the feedback report, resources used for sending the feedback report, and/or a metric associated with the encoded one or more CSI measurements. The indication of the selected CSI quantization setting may comprise an index associated with the plurality of CSI quantization settings. The indication of the selected CSI quantization setting may comprise an indication of a quantization type, a quantization parameter, a quantizer granularity, and/or a resolution of the CSI quantizer. The quantization type may comprise a single-quantizer method and/or a multiple-quantizer method. The quantizer type may comprise a distribution based method, a cluster based method, or a uniform, non-uniform, or vector based quantization. The quantization parameter may comprise distribution of encoder output or the centroids of clusters. The WTRU may be configured with a fallback (e.g., secondary) quantizer. The WTRU may select the fallback (e.g., secondary) quantizer based on second criteria. the second criteria may comprise the current state of the WTRU's current state velocity, received signal strength indicator (RSSI), or performance of one or more compressed CSI quantizers and/or fallback (e.g., secondary) quantizers measured via cosine similarity and/or quality noise. The WTRU may determine a quantizer parameter based on indices associated with a predefined look-up table. The WTRU may determine one or more parameters of a codebook for a predefined CSI quantizer. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a system diagram illustrating an example communications system in which one or more disclosed embodiments may be implemented. FIG. 1B is a system diagram illustrating an example wireless transmit/receive unit (WTRU) that may be used within the communications system illustrated in FIG. 1A according to an embodiment. FIG. 1C is a system diagram illustrating an example radio access network (RAN) and an example core network (CN) that may be used within the communications system illustrated in FIG. 1A according to an embodiment. FIG. 1D is a system diagram illustrating a further example RAN and a further example CN that may be used within the communications system illustrated in FIG. 1A according to an embodiment. FIG. 2 depicts an example of a channel state information (CSI) measurement setting. FIG. 3 depicts an example of a codebook-based precoding with feedback information. FIG. 4 depicts an example of a block diagram of a CSI compression framework. FIG. 5 depicts examples of uniform and non-uniform quantizers. FIG. 6 depicts an example diagram of vector quantization. FIG. 7 depicts an example of CSI compression with quantization. FIG. 8 depicts an example of distributions of the encoder output values. FIG. 9 depicts an example of non-uniform quantization process