TW202425587A - Methods of two downlink channel state information and two uplink channel state information for full duplex system - Google Patents

Abstract

Apparatus and methods are provided downlink and uplink CSI and power control for subband full duplex (SBFD) system. In one novel aspect, two CSI-RS configurations are configured for DL CSI, one for the DL-only slots and one for the SBFD slots. In one embodiment, the UE performs channel estimation individually using the CSI-RS configured for the DL-only slots and the SBFD slots. In another embodiment, the CSI-RS signals are periodic or aperiodic. The periodicity of CSI-RS for SBFD slots and DL-only slots are different. In one embodiment, the UE receives a first SRS configuration for UL-only slots and a second SRS configuration for the SBFD slots, transmits the SRS signals on UL-only slots and SBFD slots based on the first SRS configuration and the second SRS configuration. In another novel aspect, the UE receives two different sets of power control parameters for UL-only slots and the SBFD slots.

Description

A method for two downlink channel status information and two uplink channel status information for a full duplex system

The present disclosure relates to wireless communications and, more particularly, to downlink (DL) and uplink (UL) channel state information (CSI) for full-duplex systems.

The statements in this section merely provide background information related to the present invention and may not constitute prior art.

The development of wireless communication technology has been noted through continuous advancements aimed at enhancing data rates, reducing latency, and increasing network capacity. Full-duplex communication allows for simultaneous transmission and reception on the same frequency channel. Within the realm of evolving wireless networks, Subband Full Duplex (SBFD) has emerged as a promising solution to address the growing demand for high-speed, low-latency wireless connections. Full-duplex communication essentially allows wireless devices to simultaneously transmit and receive data on the same frequency band, effectively doubling the available bandwidth and increasing spectral efficiency. Traditional communication systems employ half-duplex operation, where a device can either transmit or receive data at a given moment. Full-duplex operation holds the promise of significantly improving wireless communications by alleviating the limitations of half-duplex systems, such as increased latency and reduced network capacity.

Sub-band full-duplex systems further develop full-duplex communications by utilizing a sub-band allocation approach. Instead of transmitting and receiving over the entire frequency band, the system divides the available spectrum into smaller sub-bands. Individual sub-bands are then assigned for specific transmit and receive tasks. While SBFD provides flexibility to wireless systems and offers higher efficiency, it poses new challenges in areas such as channel state information estimation due to potential additional interference. And there is a need to improve and enhance the UL and DL channel state information for full-duplex systems.

The following presents a simplified summary of one or more embodiments in order to provide a basic understanding of these embodiments. This summary is not an extensive overview of all contemplated embodiments, and is intended to neither identify the core or key elements of all embodiments nor the scope of any or all embodiments. Its sole purpose is to present some concepts of one or more embodiments in a simplified form as a prelude to a more detailed description that is presented later.

An apparatus and method for downlink and uplink CSI for a full-duplex system are provided. In one novel aspect, two CSI reference signal (CSI-RS) configurations and two CSI reports are configured for downlink (DL) channel status information (CSI), one for a DL-only time slot and the other for a SBFD time slot. In one embodiment, a UE receives a first CSI-RS configuration for a DL-only time slot and a second CSI-RS configuration for a SBFD time slot, wherein each CSI-RS configuration includes a configuration for a channel measurement resource (CMR) and an interference measurement resource (IMR); based on the first CSI-RS configuration and the second CSI-RS configuration, a CSI-RS signal is received on DL resources of a DL-only time slot and a SBFD time slot, and CSI measurement of the CSI-RS signal is performed. In one embodiment, the UE estimates interference covariance separately on the Interference Measurement Resource (IMR) for the DL-only time slot and the IMR for the SBFD time slot. In another embodiment, common channel measurement resources (CMR) are configured for the DL-only time slot and the SBFD time slot. In one embodiment, the UE uses the CSI-RS configured for the SBFD time slot to perform channel estimation. In one embodiment, the CMR content is different for the first RS configuration and the second RS configuration. The UE performs channel estimation separately using the CSI-RS configured for the DL-only time slot and the CSI-RS configured for the SBFD time slot. In another embodiment, the CSI-RS signal is periodic or aperiodic, and wherein, for the periodic CSI-RS signal, the periodicity of the CSI-RS is different for the SBFD time slot and the DL-only time slot. In one embodiment, the UE receives a first SRS configuration for the UL-only time slot and a second SRS configuration for the SBFD time slot, and transmits an SRS signal on the UL-only time slot and the SBFD time slot based on the first SRS configuration and the second SRS configuration. In one embodiment, the SRS signal is periodic or aperiodic, and wherein, for the periodic SRS signal, the periodicity of the SRS is different for the SBFD time slot and the UL-only time slot.

In another novel aspect, a base station configures a first SRS configuration for an uplink only (UL) time slot and a second SRS configuration for a sub-band full duplex (SBFD) time slot, transmits the first SRS configuration and the second SRS configuration to one or more UEs in a wireless network, receives SRS signals on UL resources of the UL only time slot and the SBFD time slot based on the first SRS configuration and the second SRS configuration, and estimates two UL CSIs based on the received SRS signals using channel measurement results and interference covariance. In one embodiment, the base station performs channel estimation separately using the SRS for the UL only time slot and the SRS for the SBFD time slot. In another embodiment, the base station performs joint channel estimation (JCE) on at least two SBFD time slots. In yet another embodiment, the base station estimates interference covariance separately using a demodulation reference signal (DMRS) received separately on UL resources of the UL-only time slot and the SBFD time slot. In one embodiment, the SRS signal is periodic or aperiodic, and wherein, for the periodic SRS signal, the periodicity of the SRS is different for the SBFD time slot and the UL-only time slot.

In yet another embodiment, the UE receives a first power control parameter set for an uplink only (UL) time slot and a second power control parameter set for a sub-band full duplex (SBFD) time slot, and performs power control based on the first power control parameter set and the second power control parameter set. In one embodiment, the first P_0 and the first P_boost are included in the first power control parameter set, and the second P_0 and the second P_boost are included in the second power control parameter set, and wherein the first P_0 is different from the second P_0.

To accomplish the foregoing and related ends, one or more embodiments include the features hereinafter fully described and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of one or more embodiments. However, these features are merely indicative of some of the various ways in which the principles of the various embodiments may be employed, and this description is intended to include all such embodiments and their equivalents.

The detailed descriptions set forth below in conjunction with the accompanying drawings are intended as descriptions of various configurations and are not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed descriptions include specific details intended to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some cases, well-known structures and elements are shown in block diagram form to avoid obscuring such concepts.

Several embodiments of telecommunication systems will now be presented with reference to various devices and methods. These devices and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, programs, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and design constraints imposed on the overall system.

As an example, an element or any portion of an element or any combination of elements may be implemented as a "processing system" including one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout the present invention. One or more processors in a processing system may execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, software should be construed broadly to mean instructions, instruction sets, codes, code segments, code, programs, routines, software components, applications, software applications, packages, routines, subroutines, objects, executable files, programs, functions, etc.

Thus, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media may include random-access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage devices, magnetic disk storage devices, other magnetic storage devices, combinations of the foregoing types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

FIG1 is a schematic system diagram showing an exemplary wireless network configured with SBFD supporting optimized operation according to an embodiment of the present invention. The wireless network 100 includes a user equipment (UE) 110 communicatively connected to a gNB 121, which operates an access network 120, which provides wireless access using a radio access technology (RAT). The access network 120 is connected to the core network 130 through an NG interface, more specifically, to a user plane function (UPF) through an NG user-plane part (NG-u), and to a mobility management function (AMF) through an NG control plane part (NG-c). For load sharing and redundancy purposes, one gNB can be connected to multiple UPF/AMFs. The gNB 121 may provide communication coverage for a geographic coverage area, and support communication with the UE 110 via the communication link 101 in the geographic coverage area. The communication link 101 shown in the B5G/6G network 100 may include UL transmissions from the UE 110 to the gNB 121 (e.g., on a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH)) or downlink (DL) transmissions from the gNB 121 to the UE 110 (e.g., on a Physical Downlink Control Channel (PDCCH) or a Physical Downlink Shared Channel (PDSCH)).

UE 110 may be a smart phone, a wearable device, an IoT device, a tablet, etc. Alternatively, UE 110 may be a notebook (NB) or a personal computer (PC) with a data card inserted or installed, the data card including a modem and an RF transceiver to provide wireless communication capabilities. In one novel aspect, SBFD is configured for the wireless network 100. The main point of SBFD is to support low latency and a large coverage range with a low round-trip time. The availability of more frequent DL and UL resources can reduce latency for both DL and UL. For example, UL coverage is often a bottleneck in the network. Using repetition of UL data in continuous or more frequent UL resources can increase UL coverage. In one embodiment, network entities including UEs and gNBs are equipped and/or configured with different capabilities for SBFD. As an example, the wireless network 100 includes one or more SBFD-supporting gNBs 181, one or more SBFD-supporting UEs 185, one or more SBFD-aware UEs 186, and one or more SBFD-unaware UEs 183. The SBFD-supporting gNB 181 supports full duplex and uses SBFD features. The SBFD-supporting UE 185 supports full duplex and uses SBFD features. The SBFD-aware UE 186 cannot support full duplex but is aware of SBFD features. The SBFD-unaware/SBFD-unaware UE 183 cannot support full duplex and is not aware of SBFD features. The SBFD-unaware UE 183 cannot understand the SBFD configuration signaling from the gNB and cannot be scheduled in the SBFD timeslot for uplink. In one embodiment, the SBFD-supporting UE 185 and the SBFD-aware UE 186 are classified into the SBFD-considering UE 182. In one novel aspect, SBFD operations are provided, including: DL CSI-RS configuration and CSI measurement report configuration for a SBFD-supporting system; UL SRS configuration and measurement for a SBFD-enabled system; UL coverage extension and joint channel estimation (JCE) for a SBFD-enabled system; and UL power control for a SBFD-enabled system.

2 is a simplified block diagram of a gNB 121 and a UE 110 according to an embodiment of the present invention. For the gNB 121, an antenna 177 transmits and receives radio signals under a MIMO network. A radio frequency (RF) transceiver module 176 coupled to the antenna receives RF signals from the antenna, converts them into baseband signals and sends them to the processor 173. The RF transceiver 176 also converts baseband signals received from the processor 173, converts them into RF signals, and sends them to the antenna 177. The processor 173 processes the received baseband signals and calls different functional modules and circuits to execute features in the gNB 121. The memory 172 stores program instructions and data 170 for controlling the operation of the gNB 121.

Similarly, for UE 110, antenna 197 transmits and receives RF signals under the MIMO network. RF transceiver module 196 coupled to the antenna receives RF signals from the antenna, converts them to baseband signals and sends them to processor 193. RF transceiver 196 also converts baseband signals received from processor 193, converts them to RF signals, and sends them to antenna 197. Processor 193 processes the received baseband signals and calls different functional modules and circuits to execute features in UE 110. Memory 192 stores program instructions and data 190 for controlling the operation of UE 110. Although a specific number of antennas 177 and 197 are described in FIG. 2, it is contemplated that any number of antennas 177 and 197 can be introduced under the MIMO network.

The gNB 121 and the UE 110 also include a plurality of functional modules and circuits that can be implemented and configured to perform embodiments of the present invention. In the example of FIG. 2 , the gNB 121 includes a set of control functional modules and circuits 160. The configuration and control circuits 161 provide different parameters to configure and control the UE 110. The UE 110 includes a set of control functional modules and circuits 180. The DL SBFD processor 181 receives a first channel state information (CSI) reference signal (RS) configuration for a downlink (DL) only time slot and a second CSI-RS configuration for a sub-band full duplex (SBFD) time slot, and each CSI-RS configuration includes a configuration for a channel measurement resource (CMR) and an interference measurement resource (IMR); based on the first CSI-RS configuration and the second CSI-RS configuration, receives a CSI-RS signal on the DL resources of the DL only time slot and the SBFD time slot; and performs channel state information (CSI) measurement of the CSI-RS signal. The UL SBFD processor 182 receives a first sounding reference signal (SRS) configuration for an uplink only (UL) time slot and a second SRS configuration for an SBFD time slot, and transmits SRS signals in the UL only time slot and the SBFD time slot based on the first SRS configuration and the second SRS configuration. The UL power control processor 183 receives a first power control parameter set for an uplink only (UL) time slot and a second power control parameter set for a sub-band full duplex (SBFD) time slot, and performs power control based on the first power control parameter set and the second power control parameter set.

Note that the different functional modules and circuits may be implemented and configured by software, firmware, hardware, and any combination thereof. When executed by processors 193 and 173 (e.g., via executing program code 190 and 170), the functional modules and circuits allow gNB 121 and UE 110 to perform embodiments of the present invention.

FIG3 shows a schematic diagram of different configurations of a sub-band full-duplex frame structure according to an embodiment of the present invention. In one novel aspect, a wireless network is configured with SBFD to reduce latency and improve coverage. SBFD-enabled systems have different frame structures. Two exemplary SBFD frame structures 310 and 320 are shown. SBFD frame structure 310 is a DUD structure with only DL time slots 311, SBFD time slots 312, and only UL link time slots 313. SBFD frame structure 320 is a DU structure with only DL time slots 321, SBFD time slots 322, and only UL time slots 323. For DL-only time slots, such as 311 and 321, the frequency resources of the time slot are only available in the downlink direction. For UL-only time slots, such as 313 and 323, the frequency resources of the time slot are available for the uplink direction. For SBFD time slots (X-slots), such as 312 and 322, the frequency resources of the time slot are shared in both the downlink direction and the uplink direction. For example, SBFD 312 is structured as DUD (downlink, uplink, downlink) in the frequency domain with a guard band in between. SBFD 322 is structured as DU (downlink and uplink) in the frequency domain with a guard band in between. In one novel aspect, when SBFD is configured with DL-only frames and/or UL-only frames, two sets of CSI-RS and SRS are configured.

4 shows a schematic diagram of SBFD deployment scenarios including single-community SBFD and multi-community SBFD scenarios according to an embodiment of the present invention. In one novel aspect, two sets of CSI-RS configurations and two sets of CSI reports are configured for an SBFD-enabled system. Traditional CSI-RS, SRS, and CSI reporting and measurements are based on existing interference models. For an SBFD-enabled system, additional cross-link interference (Cross Link Interference, CLI) and self-interference (Self-Interference, SI) are introduced. Two exemplary scenarios are shown, including a single-community SBFD scenario 410 and a multi-community SBFD scenario 460. For the single-community scenario 410, gNB 411 communicates with UE 415 and UE 416. As an example, intra-community CLI 431 occurs for DL reception on UE 416 following UL transmission from UE 415. With SBFD transceiving, gNB 411 causes SI 432 following UL and DL in the same time slot on different frequency bands. In another exemplary scenario 460, gNB 461 communicates with UE 465 and UE 466, while neighboring community gNB 462 communicates with UE 467. As an example, UE 466 causes intra-community CLI 481 from UE 465, e.g., UL from UE 465 interferes with DL from UE 466. In addition, inter-community CLI 482 occurs between DL from UE 466 and UL of UE 467 in the neighboring community. For gNB 461, SI 483 occurs between its UL and DL in the same timeslot. Inter-community CLI 484 occurs from DL transmission of gNB 462 to UL reception of gNB 461, and inter-community CLI 485 occurs from DL transmission of gNB 461 to UL reception of gNB 462. In a novel aspect, additional CSI-RS and SRS configurations are configured separately for SBFD timeslots to count SI, intra-community CLI, and inter-cell CLI.

FIG5 shows a schematic diagram of SBFD signaling transmitted to SBFD-considering UE and SBFD-unaware UE according to an embodiment of the present invention. In one novel aspect, when SBFD is activated in a wireless system, the network configures transceiver resources to SBFD-considering UE and SBFD-unaware UE based on UE capabilities using common signaling and/or dedicated signaling. As an example, gNB 501 is connected to SBFD-considering UE 502, SBFD-unaware UE 505, and SBFD-unaware UE 506. In one embodiment, SBFD-considering UE 502 is a SBFD-supporting UE or a SBFD-aware UE. In one example, when SBFD is configured, the network notifies all UEs, including SBFD-considered UEs and SBFD-unaware UEs, with DFFFU, where D represents DL-only time slots, U represents UL-only time slots, and F represents flexible time slots. As an example, UE 505 (SBFD-unaware UE) is in a DL-centric group, and UE 506 (SBFD-unaware UE) is in a UL-centric group.

In one novel aspect, SBFD is configured for a wireless network. The gNB 501 desires to use SBFD in the time domain with a mixture of DL-only timeslots, UL-only timeslots, and SBFD timeslots. For example, the desired frame structure is DXXXU, where X represents the SBFD timeslot. In step 511, the gNB 501 signals all UEs, including SBFD-considering UE 502, SBFD-unaware UE 505, and SBFD-unaware UE 506, with common signaling indicating DFFFU. For the SBFD-considering UE 502, the gNB sends another common signaling or dedicated signaling indicating DXXXU to the UE 502. For the SBFD-unaware UE, the gNB 501 may schedule UE 505 and UE 506 in the SBFD timeslot. In step 551, the gNB 501 sends dedicated signaling indicating DDDDU to the UE 505 in the DL-centric group. In step 561, the gNB 501 sends dedicated signaling indicating DUUU to the UE 506 in the UL-centric group. In one embodiment, the SBFD-considering UE 502 is a SBFD-supporting UE or a SBFD-aware UE, which can use DL and UL resources in the SBFD timeslot based on network configuration. In one embodiment, for the UE using the SBFD timeslot, two sets of CSI-RS and CSI reports are configured.

Figure 6 shows an exemplary flow chart of DL CSI configuration and CSI reporting for a SBFD enabled system according to an embodiment of the present invention. In one novel aspect, an SBFD-considered UE requires two DL CSIs. UE 602 is connected to gNB 601. The interference pattern between the DL resources of the DL-only timeslot and the SBFD timeslot is different. The UE's DL reception on the DL-only timeslot is affected by the inter-cell co-channel interference (CCI). The UE's DL reception on the DL resources of the SBFD timeslot is additionally affected by the inter-cell and intra-community UE-to-UE subband CLI. When scheduling and link adaptation (LA) are performed, the CSI estimation on the DL-only timeslot cannot be used for the DL resources on the SBFD timeslot.

At step 611, the gNB 601 sends two CSI-RS configurations and two CSI report configurations to the UE 602. The CSI-RS configuration includes two main configurations, CSI-RS bandwidth and CSI-RS periodicity/CSI-RS aperiodicity. The CSI-RS bandwidth configuration includes subband CSI-RS for SBFD time slots and wideband CSI-RS for DL-only time slots. In one embodiment, the periodicity of the CSI-RS for the SBFD time slot and the DL-only time slot is different because the inference profile is different. For example, the periodicity of the CSI-RS for the SBFD time slot is higher than the periodicity of the DL-only time slot. In another embodiment, aperiodic CSI-RS is configured for the SBFD time slot. In one embodiment, the CSI-RS configuration includes at least a channel measurement resource (CMR) and an interference measurement resource (IMR). The gNB 601 configures separate IMRs for DL resources of DL-only timeslots and SBFD timeslots. In one embodiment, the gNB 601 configures the UE 602 with the same CMR for both DL resources of DL-only timeslots and SBFD timeslots. In another embodiment, the gNB 601 configures separate CMRs for DL resources of DL-only timeslots and SBFD timeslots.

In step 612, the gNB 601 transmits CSI-RS on the DL resources of the DL-only time slot and the SBFD time slot based on the CSI-RS configuration. In step 621, the UE 602 performs channel measurement using the CMR resources. In one embodiment, separate CMRs are configured for the DL resources of the DL-only time slot and the SBFD time slot, and the CSI-RS received on the DL resources of the DL-only time slot and the SBFD time slot, respectively, are used at the UE for channel measurement. In another embodiment, the same CMR is configured for the DL resources of the DL-only time slot and the SBFD time slot, and the CSI-RS received on the DL-only time slot is used at the UE for channel measurement. The same channel measurement result is reused in the DL resources of the SBFD time slot. In step 622, UE 602 performs separate interference covariance measurement using IMR resources for DL resources of DL-only timeslots and SBFD timeslots. Separate interference covariance measurement is performed because the expected interference is different in DL resources of DL-only timeslots and SBFD timeslots. In step 623, UE 602 makes two CSI reports for DL resources of DL-only timeslots and SBFD timeslots. In step 631, UE 602 reports two DL CSI for DL-only timeslots and SBFD timeslots based on the two CSI reporting configurations. In step 632, gNB 601 performs scheduling and LA based on the two CSI reports from UE 602.

Figure 7 shows an exemplary flow chart for UL SRS configuration and SRS measurement for a SBFD enabled system according to an embodiment of the present invention. In one novel aspect, an SBFD-considering UE requires two UL CSIs. UE 702 is connected to gNB 701. The interference pattern between the UL resources of the UL-only timeslot and the SBFD timeslot is different. The UL reception of the gNB on the UL-only timeslot is affected by co-channel interference (CCI). The UL reception of the gNB on the UL resources of the SBFD timeslot is additionally affected by self-interference (SI) and cross-link interference (CLI) between gNB-gNB subbands. During scheduling and link self-adjustment, the CSI estimated on the UL-only timeslot cannot be used for the UL resources of the SBFD timeslot.

At step 711, the gNB 701 sends two SRS configurations to the UE 702. The SRS configuration includes two main configurations, SRS bandwidth and SRS periodicity/aperiodic SRS. The SRS bandwidth configuration includes subband SRS for SBFD timeslots and wideband SRS for UL-only timeslots. In one embodiment, the periodicity of SRS for SBFD timeslots and UL-only timeslots is different. For example, during scheduling and link self-adjustment, the CSI estimated on the UL-only timeslot cannot be used for the UL resources of the SBFD timeslot. In another embodiment, aperiodic SRS is configured for the SBFD timeslot. Whenever the gNB needs to measure the CSI for the SBFD timeslot, the gNB can trigger the UE to perform aperiodic SRS transmission. At step 712, the UE 702 transmits SRS on UL resources of the UL-only time slot and the SBFD time slot based on the SRS configuration. In one embodiment, a single SRS setting for CSI measurement is configured for both the UL-only time slot and the SBFD time slot. In another embodiment, separate SRS signals are configured for the UL-only time slot and the SBFD time slot.

In one embodiment, gNB 701 estimates the Signal-to-Interference-plus-Noise Ratio (SINR) using channel and interference covariance measurement results for each UL CSI. In step 721, gNB 702 performs channel measurement using the received SRS. In one embodiment, a separate SRS resource is used for each CSI measurement. In another embodiment, SRS resources on the UL-only timeslot are used for both CSI measurements. The same channel measurement results are reused in the UL resources of the SBFD timeslot. In step 722, gNB 701 performs separate interference covariance measurement using a demodulation reference signal (DMRS) received on the UL resources of the UL-only timeslot and the SBFD timeslot. DMRS is sent by the scheduled UE on the scheduled resources. The idea behind separate interference covariance measurements is that the interference in the UL resources in UL-only timeslots and SBFD timeslots is expected to be different. In step 723, the gNB 701 performs effective SINR determination for UL-only timeslots and SBFD timeslots. SINR estimation is performed for each subband. The gNB uses the estimated SINR to calculate the effective SINR of the physical uplink shared channel (PUSCH) resources. The Power Density Offset (PDO) between PUSCH and SRS is estimated. The effective SINR is calculated by applying the PDO to the estimated SINR.

In step 731, gNB 701 performs UL scheduling and link self-adjustment based on the two UL CSIs. Scheduling and LA are determined based on SINR according to the time slot type. gNB 701 grants UL scheduling information to the scheduled UE 702.

FIG8 shows a schematic diagram of coverage extension using repeated transmissions on multiple SBFD time slots according to an embodiment of the present invention. In one novel aspect, multiple SBFD time slots are used for repeated transmissions. Uplink coverage can be extended by using transmission repetitions on multiple SBFD time slots. As shown in the figure, the SBFD-enabled frame structure includes only DL time slots 811, SBFD time slots 812, and only UL time slots 813. As an example, uplink resources 821, 822, and 823 of the SBFD time slots are three consecutive SBFD time slots allocated to the UE. The first SBFD time slot (resource 821) is configured to send a new transmission block, and the same transmission block is repeated on the next two SBFD time slots (resources 822 and 823). The gNB may receive and combine all three receptions for better decoding. This scheme may increase uplink coverage for community edge UEs. In one embodiment 820, joint channel estimation (JCE) is applied at the gNB across UL resources of multiple SBFD time slots. JCE may improve channel estimation quality. JCE may not be applied across UL-only time slots and SBFD time slots due to the difference in transmit power between UL-only time slots and SBFD time slots, the difference in interference levels between UL-only time slots and SBFD time slots, and the phase discontinuity across UL-only time slots and SBFD time slots. JCE may be applied across multiple SBFD time slots because transmit power, interference power, and phase continuity are expected to be similar in SBFD time slots.

FIG9 shows a schematic diagram of uplink control using different UL power control parameters configured for UL-only timeslots and SBFD timeslots according to an embodiment of the present invention. In one novel aspect, for UL power control, two power control parameter sets are configured, one power control parameter set for UL-only timeslots and the other power control parameter set for SBFD timeslots. In step 901, a UE is configured with UL-only timeslots and SBFD timeslots. In step 910, a first power control parameter set for UL-only timeslots is configured, including at least one of P_0_U 911 and P_boost_U 912. In step 920, a second power control parameter set for SBFD timeslots is configured, including at least one of P_0_SBFD 921 and P_boost_SBFD 922. In one embodiment, the first set of power control parameters is different from the second set of power control parameters. In one embodiment, the SBFD timeslots require power boosting to ensure better coverage and overcome heavy SI and gNB-gNB CLI. To achieve the power boost, in one embodiment, different power control parameters such as P_0 and α are used for UL-only timeslots and SBFD timeslots. In another embodiment, the gNB signals an explicit power boost value P_boost. In yet another embodiment, closed-loop power control is used. For accumulated TPC, accumulation is performed separately for UL-only timeslots and SBFD timeslots. For absolute TPC, only a maximum of +4dB can be achieved. In one embodiment, the P_0 parameter is optimized based on CLI measurement results. P_0_U 911 is assumed. Proportional to the CLI-RSSI measurement result, P_0_SBFD 921 is adjusted as follows: Wherein, I_SB and I_U are CLI-RSSI measurement results measured by the UE in the SBFD time slot and the UL-only time slot, and R_SB and R_U are the sum of SRS-RSRP measurement results measured from other UEs in the SBFD time slot and the UL-only time slot. In order to obtain better network UL throughput, the two adjustment amounts a and b are fine-tuned. In step 930, power control is performed based on the first power control parameter set and the second power control parameter set. In one embodiment, UL CSI measurement results and LA (rank and MCS) are further assumed based on the corresponding power control.

Figure 10 shows an exemplary flow chart of a UE performing CSI on a SBFD-enabled channel according to an embodiment of the present invention. In step 1001, the UE receives a first channel state information (CSI) reference signal (RS) configuration for a downlink (DL) time slot only and a second CSI-RS configuration for a sub-band full duplex (SBFD) time slot, and wherein each CSI-RS configuration includes a configuration for a channel measurement resource (CMR) and an interference measurement resource (IMR). In one embodiment, the UE is a SBFD-considering UE. In step 1002, the UE receives a CSI-RS signal on DL resources of a DL-only time slot and a SBFD time slot based on the first CSI-RS configuration and the second CSI-RS configuration. In step 1003, the UE performs channel state information (CSI) measurement of the CSI-RS signal.

Figure 11 shows an exemplary flow chart of a gNB performing CSI on a SBFD-enabled channel according to an embodiment of the present invention. In step 1101, the gNB configures a first sounding reference signal (SRS) configuration for an uplink-only (UL) time slot and a second SRS configuration for a sub-band full duplex (SBFD) time slot. In step 1102, the gNB sends the first SRS configuration and the second SRS configuration to one or more UEs in a wireless network. In step 1103, the gNB receives SRS signals on UL resources of a UL-only time slot and a SBFD time slot based on the first SRS configuration and the second SRS configuration. In step 1104, the gNB estimates two UL channel state information (CSI) based on the received SRS signal using channel measurement results and interference covariance.

FIG12 shows an exemplary flow chart of a UE performing UL power control on an SBFD enabled channel according to an embodiment of the present invention. In step 1201, the UE receives a first power control parameter set for an uplink only (UL) time slot and a second power control parameter set for a sub-band full duplex (SBFD) time slot. In step 1202, the UE performs power control based on the first power control parameter set and the second power control parameter set.

It should be understood that the specific order or hierarchy of blocks in the disclosed process/flowchart is a schematic illustration of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of blocks in the process/flowchart can be rearranged. In addition, some blocks can be combined or omitted. The attached method claims present the elements of each block in a sample order and are not intended to be limited to the specific order or hierarchy presented.

The foregoing description is provided to enable those skilled in the art to practice the various embodiments described herein. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments. Therefore, the claims are not intended to be limited to the embodiments shown herein, but are given the full scope consistent with the language claims, wherein references to elements in the singular are not intended to mean "one and only one" (unless specifically stated), but "one or more". The word "exemplary" means "serving as an example, instance, or illustration" in this article. Any embodiment described as "exemplary" herein is not necessarily to be construed as being preferred or advantageous over other embodiments. Unless otherwise specifically stated, the term "some" refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more members or multiple members of A, B, or C. All structural and functional equivalents of the elements of the various embodiments described herein that are known or later known to a person of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be exclusive to the public, regardless of whether such disclosure is expressly recorded in the claims. The words "module", "mechanism", "element", "equipment", etc. cannot replace the word "device". Therefore, unless the element is expressly stated using the phrase "device", the claim element shall not be interpreted as a device plus function. The above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall be covered by the present invention.

100: Wireless network 121,411,461,462,501,601,701: gNB 110,415,416,465,466,467,602,702: User equipment (UE) 120: Operational access network 130: Core network 160,180: Control function modules and circuits 161: Configuration and control circuits 170,190: Program instructions and data 172: Memory 173,193: Processor 176,196: Radio frequency (RF) transceiver module 177,197: Antenna 181: SBFD-support gNB 182,502: SBFD-consider UE 183,505,506:SBFD-unaware UE 185:SBFD-supporting UE 186:SBFD-aware UE 310,320:SBFD frame structure 311,321,811:DL time slot only 312,322,812:SBFD time slot 313,323,813:UL link time slot only 410:Single community SBFD scenario 431,481:Intra-community CLI 482,484,485:Inter-community 432,483:Self-Interference (SI) 460:Multi-community SBFD scenario 462:Neighboring community gNB 502:SBFD-considering UE 611,612,621,622,623,631,632,711,712,721,722,723,731,901,910,920,930,1001,1002,1003,1101,1102,1103,1104,1201,1202: steps 821,822,823: resources 911,912: first power control parameter set 921,922: second power control parameter set

FIG. 1 shows a schematic system diagram of an exemplary wireless network configured with SBFD supporting optimized operation according to an embodiment of the present invention. FIG. 2 is a simplified block diagram of a gNB and a UE according to an embodiment of the present invention. FIG. 3 shows a schematic diagram of different configurations of a subband full-duplex frame structure according to an embodiment of the present invention. FIG. 4 shows a schematic diagram of SBFD deployment scenarios including single-community SBFD and multi-community SBFD scenarios according to an embodiment of the present invention. FIG. 5 shows a schematic diagram of SBFD signaling transmitted to SBFD-considering UEs and SBFD-unaware UEs according to an embodiment of the present invention. FIG. 6 shows an exemplary flow chart of DL CSI configuration and CSI reporting for an SBFD-enabled system according to an embodiment of the present invention. FIG. 7 shows an exemplary flow chart of UL SRS configuration and SRS measurement for an SBFD-enabled system according to an embodiment of the present invention. FIG8 shows a schematic diagram of coverage extension using repeated transmission on multiple SBFD time slots according to an embodiment of the present invention. FIG9 shows a schematic diagram of uplink control using different UL power control parameters configured for UL-only time slots and SBFD time slots according to an embodiment of the present invention. FIG10 shows an exemplary flow chart of CSI performed by a UE on an SBFD activation channel according to an embodiment of the present invention. FIG11 shows an exemplary flow chart of CSI performed by a gNB on an SBFD activation channel according to an embodiment of the present invention. FIG12 shows an exemplary flow chart of UL power control performed by a UE on an SBFD activation channel according to an embodiment of the present invention.

310,320: SBFD frame structure

311,321,811: DL time slot only

312,322,812: SBFD time slot

313,323,813: UL link time slot only

Claims (15)

A method for a user equipment (UE) in a wireless network, the method comprising: Receiving, by the UE, a first channel state information (CSI) reference signal (RS) configuration for a downlink-only (DL) time slot and a second CSI-RS configuration for a subband full-duplex (SBFD) time slot, wherein each CSI-RS configuration comprises a configuration for a channel measurement resource (CMR) and a configuration for an interference measurement resource (IMR); Based on the first CSI-RS configuration and the second CSI-RS configuration, receiving a CSI-RS signal on DL resources of a DL-only time slot and a SBFD time slot; and Performing channel state information (CSI) measurement of the CSI-RS signal. The method of claim 1, wherein the UE estimates interference covariance separately on the IMR configured for the DL-only timeslot and the IMR configured for the SBFD timeslot. A method as claimed in claim 1, wherein a common CMR is configured for DL-only time slots and SBFD time slots. The method of claim 1, wherein the UE performs channel estimation using the configured CSI-RS on the CMR. The method of claim 1, wherein the content of the CMR for the first CSI-RS configuration and the second CSI-RS configuration is different. The method of claim 5, wherein the UE performs channel estimation separately using the CSI-RS configured for the DL-only time slot and the CSI-RS configured for the SBFD time slot. The method of claim 1, further comprising: receiving a first CSI report configuration for a DL-only time slot and a second CSI report configuration for a SBFD time slot. The method of claim 1, wherein the CSI-RS signal is periodic or aperiodic, and wherein for a periodic CSI-RS signal, the periodicity of the CSI-RS is different for SBFD time slots and DL-only time slots. The method of claim 1 further comprises: receiving a first sounding reference signal SRS configuration for an uplink only UL time slot and a second SRS configuration for a subband full duplex SBFD time slot; and based on the first SRS configuration and the second SRS configuration, sending an SRS signal on the UL only time slot and the SBFD time slot. The method of claim 9, wherein the SRS signal is periodic or non-periodic, and wherein for a periodic SRS signal, the periodicity of the SRS is different for SBFD time slots and UL-only time slots. A method for a base station in a wireless network, the method comprising the following steps: Configuring a first sounding reference signal SRS configuration for an uplink only UL time slot and a second SRS configuration for a sub-band full-duplex SBFD time slot; Sending the first SRS configuration and the second SRS configuration to one or more UEs in the wireless network; Based on the first SRS configuration and the second SRS configuration, receiving SRS signals on UL resources of an UL only time slot and an SBFD time slot; and Based on the received SRS signal, estimating two UL channel state information CSIs using channel measurement results and interference covariance. The method of claim 11, wherein the base station performs channel estimation separately using the SRS for the UL-only timeslot and the SRS for the SBFD timeslot. The method of claim 11, wherein the base station performs a joint channel estimation (JCE) on at least two SBFD time slots. The method of claim 11, further comprising: Configuring a first CSI-RS configuration for a downlink-only DL time slot and a second CSI-RS configuration for a SBFD time slot; Sending the first CSI-RS configuration and the second CSI-RS configuration to one or more UEs; Sending the first CSI report configuration and the second CSI report configuration to one or more UEs; and Receiving the first CSI report and the second CSI report from each of the one or more UEs. A method for a user equipment (UE) in a wireless network, the method comprising the following steps: Receiving, by the UE, a first power control parameter set for an uplink-only (UL) time slot and a second power control parameter set for a subband full-duplex (SBFD) time slot; and Performing power control based on the first power control parameter set for the uplink-only (UL) time slot and the second power control parameter set for the SBFD time slot; Wherein, at least one of a first P_0 and a first P_boost is included in the first power control parameter set, and at least one of a second P_0 and a second P_boost is included in the second power control parameter set.