EP-4740310-A1 - USER EQUIPMENT DENSITY-BASED CODEBOOK ADJUSTMENT FOR RECONFIGURABLE INTELLIGENT SURFACE-ASSISTED COMMUNICATIONS

Abstract

Methods, systems, and devices that support user equipment (UE) density-based codebook adjustment for reconfigurable intelligent surface (RIS)-assisted communications are described. A network entity may configure RIS codebooks based on dynamically changing UE densities, such that codebooks may be tailored for geographical regions with higher UE densities. The network entity may determine a geographical region to be served using a RIS associated with a higher UE density as compared to one or more UE densities associated with one or more other geographical regions. The network entity may indicate a codebook to a controller associated with the RIS that is associated with a set of parameters that may be based on the geographical region.

Inventors

• YAPICI, YAVUZ
• LI, JUNYI

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260513

Application Date

20240606

Claims (20)

1. 1 . A network entity for wireless communication, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to: receive a first indication of a first geographical region associated with a first UE density that is greater than a second UE density associated with a second geographical region; transmit, to a controller associated with a reconfigurable intelligent surface, a second indication of a codebook for communication using the reconfigurable intelligent surface, the codebook associated with a set of parameters that is based at least in part on the first indication of the first geographical region; and perform, using the reconfigurable intelligent surface in accordance with the codebook, a beam sweeping operation in the first geographical region.
2. 2. The network entity of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: transmit, to the controller after performing the beam sweeping operation, a third indication of a second codebook for the communication using the reconfigurable intelligent surface based at least in part on a change of the second UE density to be greater than the first UE density, the second codebook associated with a second set of parameters that is based at least in part on the second geographical region; and perform, using the reconfigurable intelligent surface in accordance with the second codebook, a second beam sweeping operation in the second geographical region.
3. 3. The network entity of claim 2, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: determine that the second UE density changed to be greater than the first UE density in accordance with a pattern of UE densities in respective geographical regions over time, wherein the third indication is transmitted based at least in part on the determining.
4. 4. The network entity of claim 2, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: receive, before transmitting the third indication, a fourth indication of the second geographical region based at least in part on the change of the second UE density to be greater than the first UE density 7 , wherein the third indication is transmitted based at least in part on the fourth indication.
5. 5. The network entity of claim 4, wherein: the change of the second UE density satisfies a threshold change from a pattern of UE densities in the second geographical region over time, and the fourth indication is received based at least in part on the change of the second UE density satisfying the threshold change.
6. 6. The network entity of claim 2, wherein: the set of parameters comprises a first quantity of codewords included in the codebook and the second set of parameters comprises a second quantity’ of codewords included in the second codebook, and the second quantity of codewords is different than the first quantity’ of codewords based at least in part on the first geographical region being a first distance from the reconfigurable intelligent surface that is different than a second distance of the second geographical region from the reconfigurable intelligent surface.
7. 7. The network entity of claim 2, wherein: the set of parameters comprises at least one of a first field of view associated with the first geographical region, one or more first focal distances associated with the first geographical region, and a first quantity of codewords included in the codebook, and the second set of parameters comprises at least one of a second field of view associated with the second geographical region, one or more second focal distances associated with the second geographical region, and a second quantity of codewords included in the second codebook.
8. 8. The network entity of claim 7, wherein the first quantity of codewords is different than the second quantity 7 of codewords based at least in part on the first field of view being different than the second field of view.
9. 9. The network entity of claim 7, wherein the first field of view is the same as the second field of view and the one or more first focal distances are different than the one or more second focal distances.
10. 10. The network entity of claim 1, wherein the set of parameters comprises at least one of a field of view associated with the first geographical region, one or more focal distances from the reconfigurable intelligent surface, and a quantity of codewords included in the codebook.
11. 11. The network entity of claim 1 , wherein, to receive the first indication, the one or more processors are individually or collectively operable to execute the code to cause the network entity to: receive, via one or more secure control messages, first positioning information associated with user equipments (UEs) located in the first geographical region over one or more durations and second positioning information associated w ith UEs located in the second geographical region over the one or more durations, wherein the first UE density 7 is determined to be greater than the second UE density based at least in part on the first positioning information and the second positioning information.
12. 12. The network entity of claim 1, wherein the first indication indicates that the network entity is to determine the set of parameters associated with the codebook to prioritize communications within the first geographical region over the second geographical region or a combination of the first geographical region and the second geographical region.
13. 13. The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: transmit, to the controller after performing the beam sweeping operation, a third indication of a second codebook for the communication using the reconfigurable intelligent surface based at least in part on a change of the first UE density, a change of the second UE density, or both, the second codebook associated with a second set of parameters that is based at least in part on a third geographical region comprising the first geographical region and the second geographical region; and perform, using the reconfigurable intelligent surface in accordance with the second codebook, a second beam sweeping operation in the third geographical region.
14. 14. The network entity of claim 13, wherein: the set of parameters comprises a first quantity of codewords included in the codebook and the second set of parameters comprises a second quantity of codewords included in the second codebook, and the second quantity of codewords is greater than the first quantity of codewords based at least in part on the third geographical region being larger than the first geographical region.
15. 15. A method for wireless communications by a network entity, comprising: receiving a first indication of a first geographical region associated with a first UE density that is greater than a second UE density associated with a second geographical region; transmitting, to a controller associated with a reconfigurable intelligent surface, a second indication of a codebook for communication using the reconfigurable intelligent surface, the codebook associated with a set of parameters that is based at least in part on the first indication of the first geographical region; and performing, using the reconfigurable intelligent surface in accordance with the codebook, a beam sweeping operation in the first geographical region.
16. 16. The method of claim 15, further comprising: transmiting, to the controller after performing the beam sweeping operation, a third indication of a second codebook for the communication using the reconfigurable intelligent surface based at least in part on a change of the second UE density to be greater than the first UE density, the second codebook associated with a second set of parameters that is based at least in part on the second geographical region; and performing, using the reconfigurable intelligent surface in accordance with the second codebook, a second beam sweeping operation in the second geographical region.
17. 17. The method of claim 16, further comprising: determining that the second UE density changed to be greater than the first UE density in accordance with a patern of UE densities in respective geographical regions over time, wherein the third indication is transmited based at least in part on the determining.
18. 18. The method of claim 16, further comprising: receiving, before transmitting the third indication, a fourth indication of the second geographical region based at least in part on the change of the second UE density to be greater than the first UE density, wherein the third indication is transmited based at least in part on the fourth indication.
19. 19. The method of claim 18, wherein: the change of the second UE density satisfies a threshold change from a patern of UE densities in the second geographical region over time, and the fourth indication is received based at least in part on the change of the second UE density satisfying the threshold change.
20. 20. The method of claim 16, wherein: the set of parameters comprises a first quantity of codewords included in the codebook and the second set of parameters comprises a second quantify of codewords included in the second codebook, and the second quantify of codewords is different than the first quantify of codewords based at least in part on the first geographical region being a first distance from the reconfigurable intelligent surface that is different than a second distance of the second geographical region from the reconfigurable intelligent surface.

Description

USER EQUIPMENT DENSITY-BASED CODEBOOK ADJUSTMENT FOR RECONFIGURABLE INTELLIGENT SURFACE-ASSISTED COMMUNICATIONS CROSS REFERENCE [0001] The present Application for Patent claims priority to U.S. Patent Application No. 18/348,208 by YAPICI et al., entitled “USER EQUIPMENT DENSITY-BASED CODEBOOK ADJUSTMENT FOR RECONFIGURABLEINTELLIGENT SURFACE- ASSISTED COMMUNICATIONS, ' filed July 6. 2024. which is assigned to the assignee hereof and expressly incorporated by reference herein. FIELD OF TECHNOLOGY [0002] The following relates to wireless communication, including user equipment (UE) density -based codebook adjustment for reconfigurable intelligent surface (RIS)- assisted communications. BACKGROUND [0003] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE). [0004] A network entity in a wireless multi-access communications systems may communicate information with a UE using a reconfigurable intelligent surface (RIS). A RIS may include reflecting or refracting elements operable to redirect incident signals from the network entity toward the UE, and vice versa. SUMMARY [0005] The described techniques relate to improved methods, systems, devices, and apparatuses that support user equipment (UE) density-based codebook adjustment for reconfigurable intelligent surface (RlS)-assisted communications. For example, the described techniques provide for configuring RIS codebooks based on dynamically changing UE densities such that codebooks may be tailored (e.g., sized, associated with a field of view (FOV), associated with one or more focal distances associated with beamfocusing) for coverage areas with higher UE densities. For example, a network entity may determine (e.g., receive an indication of) a geographical region to be served using a RIS associated with a relatively higher UE density (e.g., when compared to one or more UE densities associated with one or more other geographical regions), which may be referred to as a region of interest. The network entity may indicate a codebook to a controller associated with the RIS that is associated with a set of parameters that may be based on the geographical region. In some cases, a network (e.g., that indicates the geographical region to the network entity), the network entity, or both may dynamically determine the geographical region based on a priori known or learned patterns of changing UE density over time and use codebooks that are tailored for the geographical region in accordance with the pattern. [0006] A method for wireless communications by a network entity is described. The method may include receiving a first indication of a first geographical region associated with a first UE density that is greater than a second UE density associated with a second geographical region, transmitting, to a controller associated with a RIS. a second indication of a codebook for communication using the RIS, the codebook associated with a set of parameters that is based on the first indication of the first geographical region, and performing, using the RIS in accordance with the codebook, a beam sweeping operation in the first geographical region. [0007] A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively operable to execute the code to cause the network entity to receive a first indication of a first geographical region associated with a first UE density that is greater than a second UE density associated with a second geographical region, transmit, to a controller associated with a RIS, a second indication of a codebook for communication using the RIS, the codebook associated with a set of parameters that is based on the first indication of the first geographical region, and perform, using the RIS in accordance with the codebook, a beam sweeping operation in the firs