EP-3622644-B1 - TECHNIQUES AND APPARATUSES FOR NESTING A NEW RADIO SYSTEM AND A LONG TERM EVOLUTION SYSTEM

Inventors

• JOHN WILSON, MAKESH PRAVIN
• WANG, XIAO FENG
• LUO, TAO
• AKKARAKARAN, SONY
• NAM, WOOSEOK
• NAGARAJA, SUMEETH
• CHEN, SHENGBO
• CHAKRABORTY, KAUSHIK

Dates

Publication Date

20260513

Application Date

20180508

Claims (15)

1. A method for wireless communication performed by a user equipment, UE, comprising: measuring (1410) a first reference signal, associated with a frequency band of a long term evolution, LTE, system, and a second reference signal associated with a frequency band of a new radio, NR, system, wherein the frequency band of the NR system overlaps the frequency band of the LTE system, and wherein at least a portion of each of multiple LTE frequency bands utilized by the UE is overlapped by the NR frequency band, wherein the first reference signal is included in a set of interference measurement resources, IMRs, associated with the frequency band of the LTE system; determining (1420) first channel state feedback, associated with the frequency band of the LTE system, and second channel state feedback, associated with the frequency band of the NR system, based at least in part on the first reference signal and the second reference signal, respectively; and reporting (1430) the first channel state feedback and the second channel state feedback in uplink control information, UCI.
2. The method of claim 1, wherein both the first channel state feedback and the second channel state feedback are reported in the UCI, wherein the first channel state feedback and the second channel state feedback are jointly encoded in the UCI.
3. The method of claim 1, further comprising: receiving configuration information that identifies a LTE codebook for determining the first channel state feedback and a NR codebook for determining the second channel state feedback, wherein the first reference signal and the second reference signal are carried in a same set of resources, and wherein the NR codebook is different from the LTE codebook such that the first channel state feedback is different from the second channel state feedback.
4. The method of claim 1, further comprising: receiving configuration information that identifies a reporting mode associated with reporting UCI associated with measurements taken in overlapping frequency bands, wherein the reporting mode indicates whether the UCI is to be reported in an uplink transmission associated with the frequency band of the LTE system or an uplink transmission associated with the frequency band of the NR system, and wherein the UE is configured to report the UCI in accordance with the reporting mode.
5. The method of claim 1, further comprising: receiving configuration information that identifies an encoding technique associated with reporting the UCI; and generating the UCI, including the first channel state feedback and the second channel state feedback, based at least in part on the encoding technique.
6. The method of claim 5, wherein the UE is configured to encode the first channel state feedback and the second channel state feedback in a first set of bits and a second set of bits of the UCI, respectively.
7. The method of claim 5, wherein the UE is configured to encode the first channel state feedback in a first set of bits of the UCI and encode information that identifies a difference between the first channel state feedback and the second channel state feedback in a second set of bits of the UCI, wherein the second set of bits includes fewer bits than the first set of bits.
8. The method of claim 1, further comprising: receiving configuration information that signals a first set of resources, associated with the frequency band of the LTE system, that carry the first reference signal and a second set of resources, associated with the frequency band of the NR system, that carry the second reference signal.
9. The method of claim 1, wherein the UE is configured to report the UCI in an uplink transmission associated with the frequency band of the LTE system.
10. The method of claim 1, wherein the UE is configured to report the UCI in an uplink transmission associated with the frequency band of the NR system.
11. The method of claim 1, wherein the first reference signal or the second reference signal is a channel state information reference signal, CSI-RS.
12. The method of claim 1, further comprising: receiving a physical downlink shared channel, PDSCH, in a downlink transmission associated with the NR system or a downlink transmission associated with the LTE system, wherein the PDSCH is scheduled based at least in part on the reported UCI.
13. An apparatus for wireless communication, comprising: means for measuring (1410) a first reference signal, associated with a frequency band of a long term evolution, LTE, system, and a second reference signal associated with a frequency band of a new radio, NR, system, wherein the frequency band of the NR system overlaps the frequency band of the LTE system, and wherein at least a portion of each of multiple LTE frequency bands utilized by the apparatus is overlapped by the NR frequency band, wherein the first reference signal is included in a set of interference measurement resources, IMRs, associated with the frequency band of the LTE system; means for determining (1420) first channel state feedback, associated with the frequency band of the LTE system, and second channel state feedback, associated with the frequency band of the NR system, based at least in part on the first reference signal and the second reference signal, respectively; and means for reporting (1430) the first channel state feedback or the second channel state feedback in uplink control information, UCI.
14. The apparatus for wireless communication according to claim 13, further comprising means for carrying out the method of any of claims 2 to 12.
15. A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any of claims 1 to 12.

Description

FIELD OF THE DISCLOSURE Aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for nesting a new radio (NR) system and a long term evolution (LTE) system. BACKGROUND Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, Long Term Evolution (LTE), and New Radio (NR). A wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A UE may communicate with a BS via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a new radio (NR) BS, a 5G Node B, and/or the like. The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. NR, which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDM with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread ODFM (DFT-S-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. Document 3GPP, R2-166929 refers to LTE NR Inter-RAT measurement. The measurement configuration/reporting method defined in LTE can be reused in NR. Document 3GPP, R1-166924 refers to coexistence of NR and LTE. The transmission duration of LTE signal for measurement is overlapped with that of NR signal. SUMMARY The invention is defined in independent claims. Dependent claims concern particular embodiments of the invention. Any subject matter presented in the description but not falling under the claims constitutes an aspect of the disclosure which may be useful for understanding the invention. In some aspects, a method for wireless communication performed by a user equipment (UE) may include obtaining synchronization information, associated with a frequency band of a LTE system, based at least in part on a set of synchronization signals associated with the frequency band of the LTE system; and receiving, based at least in part on a quasi co-location (QCL) indication and the synchronization information, a reference signal associated with a frequency band of a NR system, wherein the QCL indication includes information indicating quasi co-location between the reference signal, associated with the frequency band of the NR system, and the set of synchronization signals associated with the frequency band of the LTE system, and wherein the frequency band of the NR system overlaps the frequency band of the LTE system. In some aspects, a UE for wireless communication may include one or more processors configured to obtain synchronization information, associated with a frequency band of a LTE system, based at least in part on a set of synchronization signals associated with the frequency band of the LTE system; and receive, based at least in part on a QCL indication and the synchronization information, a reference signal associated with a frequency band of a NR system, wherein the QCL indication includes information indicating quasi co-location between the reference signal, associated with the frequency band of the NR system, and the set of synchronization signals associated with the frequency band of