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WO2025210020A1 - Configuration de transmission en liaison montante pour sbfd - Google Patents

Configuration de transmission en liaison montante pour sbfd

Info

Publication number
WO2025210020A1
WO2025210020A1 PCT/EP2025/058830 EP2025058830W WO2025210020A1 WO 2025210020 A1 WO2025210020 A1 WO 2025210020A1 EP 2025058830 W EP2025058830 W EP 2025058830W WO 2025210020 A1 WO2025210020 A1 WO 2025210020A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission mode
communications device
uplink
accordance
uplink transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2025/058830
Other languages
English (en)
Inventor
Shin Horng Wong
Naoki Kusashima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Europe BV United Kingdom Branch
Sony Group Corp
Original Assignee
Sony Europe Ltd
Sony Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Europe Ltd, Sony Group Corp filed Critical Sony Europe Ltd
Publication of WO2025210020A1 publication Critical patent/WO2025210020A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

Definitions

  • the present disclosure can help address or mitigate at least some of the issues discussed above.
  • Figure 1 schematically represents some aspects of an LTE-type wireless telecommunication system which may be configured to operate in accordance with certain embodiments of the present disclosure
  • FIG. 2 schematically represents some aspects of a new radio access technology (RAT) wireless telecommunications system which may be configured to operate in accordance with certain embodiments of the present disclosure
  • RAT radio access technology
  • Figure 9 illustrates an example of inter sub-band interference
  • Figure 10 shows an example illustrating how a user equipment (UE) may apply precoding to multiple antenna ports when performing uplink transmissions
  • Figure 12 shows a part schematic, part message flow diagram representation of an example wireless communications system comprising a communications device and an infrastructure equipment in accordance with embodiments of the present technique
  • Figure 13 shows a flow diagram illustrating an example process of communications in a communications system in accordance with embodiments of the present technique.
  • the network 6 includes a plurality of base stations 1 connected to a core network 2. Each base station provides a coverage area 3 (i.e. a cell) within which data can be communicated to and from communications devices 4. Although each base station 1 is shown in Figure 1 as a single entity, the skilled person will appreciate that some of the functions of the base station may be carried out by disparate, inter-connected elements, such as antennas (or antennae), remote radio heads, amplifiers, etc. Collectively, one or more base stations may form a radio access network.
  • Base stations which are an example of network infrastructure equipment, may also be referred to as transceiver stations, nodeBs, e-nodeBs, eNB, g-nodeBs, gNB and so forth.
  • nodeBs nodeBs
  • e-nodeBs nodeBs
  • eNB nodeB
  • g-nodeBs gNodeBs
  • Enhanced Mobile Broadband (eMBB) services are characterised by high capacity with a requirement to support up to 20 Gb/s.
  • eMBB Enhanced Mobile Broadband
  • the requirements for Ultra Reliable and Low Latency Communications (URLLC) services are for one transmission of a 32 byte packet to be transmitted from the radio protocol layer 2/3 SDU ingress point to the radio protocol layer 2/3 SDU egress point of the radio interface within 1 ms with a reliability of 1 - 10' 5 (99.999 %) or higher (99.9999%) [2],
  • Massive Machine Type Communications is another example of a service which may be supported by NR-based communications networks.
  • systems may be expected to support further enhancements related to Industrial Internet of Things (IIoT) in order to support services with new requirements of high availability, high reliability, low latency, and in some cases, high-accuracy positioning.
  • IIoT Industrial Internet of Things
  • Each of the distributed units 41, 42 are connected to a central unit (CU) 40 (which may be referred to as a controlling node) via an interface 46.
  • the central unit 40 is then connected to the core network 20 which may contain all other functions required to transmit data for communicating to and from the wireless communications devices and the core network 20 may be connected to other networks 25.
  • the elements of the wireless access network shown in Figure 2 may operate in a similar way to corresponding elements of an LTE network as described with regard to the example of Figure 1. It will be appreciated that operational aspects of the telecommunications network represented in Figure 2, and of other networks discussed herein in accordance with embodiments of the disclosure, which are not specifically described (for example in relation to specific communication protocols and physical channels for communicating between different elements) may be implemented in accordance with any known techniques, for example according to currently used approaches for implementing such operational aspects of wireless telecommunications systems, e.g. in accordance with the relevant standards.
  • the core network 20 connected to the new RAT telecommunications system represented in Figure 2 may be broadly considered to correspond with the core network 2 represented in Figure 1, and the respective central units 40 and their associated distributed units / TRPs 10 may be broadly considered to provide functionality corresponding to the base stations 1 of Figure 1.
  • the term network infrastructure equipment / access node may be used to encompass these elements and more conventional base station type elements of wireless telecommunications systems.
  • the responsibility for scheduling transmissions which are scheduled on the radio interface between the respective distributed units and the communications devices may lie with the controlling node / central unit and / or the distributed units / TRPs.
  • a communications device 14 is represented in Figure 2 within the coverage area of the first communication cell 12. This communications device 14 may thus exchange signalling with the first central unit 40 in the first communication cell 12 via one of the distributed units / TRPs 10 associated with the first communication cell 12.
  • a TRP 10 as shown in Figure 2 comprises, as a simplified representation, a wireless transmitter 30, a wireless receiver 32 and a controller or controlling processor 34 which may operate to control the transmitter 30 and the wireless receiver 32 to transmit and receive radio signals to one or more UEs 14 within a cell 12 formed by the TRP 10.
  • an example UE 14 is shown to include a corresponding transmitter 49, a receiver 48 and a controller 44 which is configured to control the transmitter 49 and the receiver 48 to transmit signals representing uplink data to the wireless communications network via the wireless access interface formed by the TRP 10 and to receive downlink data as signals transmitted by the transmitter 30 and received by the receiver 48 in accordance with the conventional operation.
  • the transmiters 30, 49 and the receivers 32, 48 may include radio frequency fdters and amplifiers as well as signal processing components and devices in order to transmit and receive radio signals in accordance for example with the 5G/NR standard.
  • the controllers 34, 44 may be, for example, a microprocessor, a CPU, or a dedicated chipset, etc., configured to carry out instructions which are stored on a computer readable medium, such as a non-volatile memory.
  • the processing steps described herein may be carried out by, for example, a microprocessor in conjunction with a random access memory, operating according to instructions stored on a computer readable medium.
  • the transmiters, the receivers and the controllers are schematically shown in Figure 3 as separate elements for ease of representation. However, it will be appreciated that the functionality of these elements can be provided in various different ways, for example using one or more suitably programmed programmable computer(s), or one or more suitably configured application-specific integrated circuit(s) / circuitry / chip(s) / chipset(s).
  • the infrastructure equipment / TRP / base station as well as the UE / communications device will in general comprise various other elements associated with its operating functionality.
  • the TRP 10 also includes a network interface 50 which connects to the DU 42 via a physical interface 16.
  • the network interface 50 therefore provides a communication link for data and signalling traffic from the TRP 10 via the DU 42 and the CU 40 to the core network 20.
  • a UE such as UE 4 or 14 to transmit uplink data to the network (e.g. on a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH)) to, for example, base station 1 or TRP 10.
  • the UE must first ensure it is synchronised with the network on the uplink. Since a particular eNB or gNB expects to be receiving communications from many UEs, it needs to ensure that it shares a common timing understanding with each of these UEs (i.e. they are synchronised in terms of the starting times of frames and Orthogonal Frequency Division Multiplexing (OFDM) symbols). This is so that the eNB is able to schedule communication with each of them in a manner that avoids collisions and to ensure orthogonality of the uplink signals, such that inter-subcarrier interference is avoided or mitigated.
  • OFDM Orthogonal Frequency Division Multiplexing
  • NR/5G networks can operate using Time Division Duplex (TDD), where an entire frequency band or carrier is switched to either downlink or uplink transmissions for a time period and can be switched to the other of downlink or uplink transmissions at a later time period.
  • TDD operates in Half Duplex mode (HD-TDD) where the gNB or UE can, at a given time, either transmit or receive packets, but not both at the same time.
  • HD-TDD Half Duplex mode
  • FD-TDD Full Duplex operation in TDD
  • FD-TDD is achieved both at the gNB and the UE, where the gNB can simultaneously schedule this UE with DL and UL transmissions within the same OFDM symbol by scheduling the DL and UL transmissions at different frequencies (e.g. physical resource blocks (PRBs)) of the system bandwidth.
  • PRBs physical resource blocks
  • a UE supporting FD-TDD requires more complex hardware than a UE that only supports HD-TDD.
  • Development of current 5G networks is focused primarily on enabling FD-TDD at the gNB with UEs operating in HD-TDD mode.
  • a gNB or UE is allowed to transmit and receive data at the same time (as with FD-TDD), the traffic latency will be improved.
  • UEs are usually coverage limited in their UL transmissions when located close to the edge of a cell. While the UE coverage at the cell-edge can be improved if more time domain resources are assigned to UL transmissions (e.g. repetitions), for HD-TDD systems, if the UL direction is assigned more time resources, fewer time resources can be assigned to the DL direction, which can lead to system imbalance.
  • continuous UL resources can be assigned for repetition opportunities whilst allowing DL traffic to occur in those resources, thereby UL enhancing coverage without causing system imbalance.
  • SBFD Sub-band Full Duplex
  • FIG. 4 An example is shown in Figure 4, where simultaneous DL and UL transmissions occur in three different non-overlapping sub-bands 401 to 403, i.e. in different sets of frequency Resource Blocks (RB): Subband#! 401, Sub-band#2 402, Sub-band#3 403.
  • the example of Figure 4 is referred to as ⁇ DUD ⁇ , because two sub-bands, Sub-band# 1 401 and Sub-band#3 403, are used for DL transmissions whilst one sub-band, Sub-band#2 402, is used for UL transmissions.
  • a guard sub-band 410 may be configured between UL and DL sub-bands 401 to 403. Guard sub-bands 410 are configured between DL Sub-band#3 403 and UL Sub-band#2 402 and between UL Sub-band#2 402 and DL Sub-band# 1 401.
  • Figure 5 shows two further examples with a DL and UL sub-band separated by a guard sub-band, where here, the UL sub-band can be configured to occupy the lower frequency portion of the BWP whilst the DL sub-band occupies higher frequency portion of the BWP ⁇ UD ⁇ or the UL sub-band occupies the higher frequency portion of the BWP whilst the DL sub-band occupies lower frequency portion of the BWP ⁇ DU ⁇ .
  • a UL sub-band# 1 501 is separated from a DL sub-band#2 503 by a guard sub-band 502 - this sub-band arrangement is referred to as ⁇ UD ⁇ .
  • Figures 4 and 5 show the system bandwidth as being divided into either two or three sub-bands, those skilled in the art would appreciate that the concept of SBFD may (in further releases of the 3GPP specifications, for example) be extended such that any number of sub-bands could be used, if deemed beneficial.
  • the system bandwidth may be divided into four sub-bands, which may, using the example of Figure 4, include the two downlink sub-bands 401, 403, the uplink sub-band 402 and another uplink sub-band, though other sub-band arrangements are envisioned.
  • Guard sub-bands may be used in substantially any sub-band arrangement.
  • FD-TDD employing SBFD suffers from intra-cell cross link interference (CLI) at the gNB and at the UE.
  • CLI intra-cell cross link interference
  • FIG. 6 An example is shown in Figure 6, where a gNB 610 is capable of FD-TDD and is simultaneously receiving UL transmission 631 from UE1 621 and transmitting a DL transmission 642 to UE2 622.
  • intra-cell CLI is caused by the DL transmission 642 at the gNB’s transmitter self-interfering 641 with its own receiver that is trying to decode UL signals 631.
  • intra-cell CLI 632 is caused by an aggressor UE, e.g. UE1 621, transmitting in the UL 631, whilst a victim UE, e.g. UE2 622, is receiving a DL signal 642.
  • SBFD sub-band interferences
  • a transmission is typically scheduled within a specific frequency channel (or sub-band), i.e. a specific set of RBs, transmission power can leak out to other channels. This occurs because channel filters are not perfect, and as such the roll-off of the filter will cause power to leak into channels adjacent to the intended specific frequency channel. While the following discussion uses the term channel, the discussion equally applies to sub-bands, such as the sub-bands shown in Figures 4 and 5.
  • the wanted transmission (Tx) power is the transmission power in the selected frequency band (i.e. the assigned channel 710). Due to roll-off of the transmission filter and nonlinearities in components of the transmitter, some transmission power is leaked into adjacent channels (including an adjacent channel 720), as shown in Figure 7.
  • the ratio of the power within the assigned frequency channel 710 to the power in the adjacent channel 720 is the Adjacent Channel Leakage Ratio (ACLR).
  • ACLR Adjacent Channel Leakage Ratio
  • the leakage power 750 will cause interference at a receiver that is receiving the signal in the adjacent channels 720.
  • a receiver’s fdter is also not perfect and will receive unwanted power from adjacent channels due to its own filter roll-off.
  • An example of filter roll-off at a receiver is shown in Figure 8.
  • a receiver is configured to receive transmissions in an assigned channel 810.
  • the imperfect nature of the receiver filter means that some transmission power 850 can be received in adjacent channels 820. Therefore, if a signal 830 is transmitted on an adjacent channel 820, the receiver will inadvertently receive the adjacent signal 830 in the adjacent channel 820, to an extent.
  • the ratio of the received power in the assigned frequency channel 810 to the received power 850 in the adjacent channel 820 is the Adjacent Channel Selectivity (ACS).
  • ACS Adjacent Channel Selectivity
  • the UE is semi-statically configured to use either Codebook Based or Non-Codebook Based UL transmission.
  • the configuration to use either Codebook based or Non-Codebook based transmission is indicated by the RRC parameter txConfig in ISiSCH-co fig. which is a UE-specific parameter applicable to a particular BWP. If the txConfig parameter is absent, the UE transmits a PUSCH (or other uplink signal) by using one antenna port only.
  • the UE In Codebook Based UL transmission mode, the UE is configured with one or more codebooks, and the gNB indicates the precoding from one of those codebooks that the UE is to use in the Transmit Precoding Matrix Index (TPMI) field in the UL Grant scheduling the PUSCH (or other uplink signal).
  • TPMI Transmit Precoding Matrix Index
  • the gNB determines the UL precoder with the help of Sounding Reference Signal (SRS) that are transmitted by the UE to the gNB in the uplink.
  • SRS Sounding Reference Signal
  • the UE determines the precoding weight by itself, without any TPMI indication from the gNB.
  • the UE may use channel reciprocity to determine the precoding weights for its UL transmission. For example, the UE may measure the Channel State Information Reference Signal (CSI-RS) or Synchronisation Signal Block (SSB) in the DL, and assume channel reciprocity (i.e. that the characteristics of the channel in the uplink are similar to or the same as those measured via CSI-RS or SSB in the downlink) to determine a set of suitable precoding weights for the UL.
  • CSI-RS Channel State Information Reference Signal
  • SSB Synchronisation Signal Block
  • the DL and UL may share the same antenna panel, but this would cause significant high inter sub-band CLI, or self-interference, at the gNB when the gNB performs simultaneous DL transmission and UL reception in SBFD OFDM symbols using this shared antenna panel.
  • One way to reduce selfinterference at the gNB receiver is to use separate antenna panels for DL and UL for SBFD OFDM symbols rather than a shared antenna panel.
  • the gNB uses three antenna panels, a “TDD” panel 1101 used for DL transmission and UL reception in DL and UL OFDM symbols respectively, a “DL” panel 1102 used for DL transmission in DL sub-bands of SBFD OFDM symbols, and a “UL” panel 1103 used for UL reception in UL sub-bands of SBFD OFDM symbols.
  • PDSCH#1 is in a DL slot and the gNB uses the “TDD” antenna panel 1101 to transmit PDSCH#1, and similarly, the gNB uses the “TDD” antenna panel 1101 to receive PUSCH#2 from the UE, which is transmitted within an UL slot by the UE.
  • PDSCH#2 and PUSCH#1 are transmissions to/from different UEs and they are scheduled at the same time in the DL sub-band and UL sub-band of a single SBFD slot in Slot w+2 respectively.
  • PDSCH#2 is therefore transmitted using the “DL” antenna panel 1102 whist PUSCH#1 is received using the “UL” antenna panel 1103 to reduce self-interference .
  • Figure 12 shows a part schematic, part message flow diagram representation of a wireless communications system comprising a communications device 1210 (e.g. a UE 14) and an infrastructure equipment 1220 (e.g. a gNB / TRP 10) in accordance with at least some embodiments of the present technique.
  • the communications device 1210 may be configured to transmit signals to and/or receive signals from the wireless communications network, for example, to and from the infrastructure equipment 1220.
  • the communications device 1210 may be configured to transmit data to and/or receive data from the wireless communications network (e.g. to/from the infrastructure equipment 1220) via a wireless radio interface provided by the wireless communications network (e.g. a Uu interface between the communications device 1210 and the Radio Access Network (RAN), which includes the infrastructure equipment 1220).
  • a wireless radio interface provided by the wireless communications network (e.g. a Uu interface between the communications device 1210 and the Radio Access Network (RAN), which includes the infrastructure equipment 1220).
  • RAN Radio Access Network
  • the communications device 1210 and the infrastructure equipment 1220 each comprise a transceiver (or transceiver circuitry) 1211, 1221, and a controller (or controller circuitry) 1212, 1222.
  • Each of the controllers 1212, 1222 may be, for example, a microprocessor, a CPU, or a dedicated chipset, etc.
  • the controllers 1212, 1222 may also each be equipped with a memory unit (which is not shown in Figure 12).
  • the controller 1212 of the communications device 1210 is configured to control the transceiver 1211 of the communications device 1210 to determine 1230 that the communications device 1210 has an uplink signal to transmit to the wireless communications network (e.g. to the infrastructure equipment 1220), to determine 1240, based on either a parameter of the uplink signal or a dynamic downlink indication received from the wireless communications network (e.g. from the infrastructure equipment 1220), whether the communications device 1210 is to transmit the uplink signal to the wireless communications network (e.g. to the infrastructure equipment 1220) in accordance with a first uplink transmission mode or a second uplink transmission mode, and to transmit 1250 the uplink signal to the wireless communications network (e.g. to the infrastructure equipment 1220) in accordance with the determined 1240 one of the first uplink transmission mode and the second uplink transmission mode.
  • the wireless communications network e.g. to the infrastructure equipment 1220
  • embodiments of the present technique propose that the UL transmission mode is dynamically switched.
  • the radio propagation channel may change between SBFD and non-SBFD OFDM symbols, and also between DL and UL sub-bands of the same SBFD OFDM symbols due to changes in antenna panels. This is in contrast to legacy systems where, for TDD operation, the antenna panel is the same for DL and UL reception as described above with reference to the example of Figure 11, and hence the UL transmission mode can be configured in a semi-static manner since the DL and UL radio channel relation is unlikely to change in a dynamic manner.
  • the second uplink transmission mode may comprise performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device, wherein the first parameters comprise first precoding weights and/or a first uplink beam and the second parameters comprise second precoding weights and/or a second uplink beam.
  • the said switching of UL transmission mode is to switch between codebook based UL transmission mode and non-codebook based UL transmission mode.
  • the gNB also indicates the precoder and/or UL beam to the UE for its UL transmission.
  • the first parameters may be indicated in a codebook received from the wireless communications network (e.g. gNB), the codebook indicating multiple sets of parameters including the first parameters, and the first uplink transmission mode is a codebook based uplink transmission mode and the second uplink transmission mode is a non-codebook based uplink transmission mode.
  • a codebook received from the wireless communications network (e.g. gNB)
  • the codebook indicating multiple sets of parameters including the first parameters
  • the first uplink transmission mode is a codebook based uplink transmission mode
  • the second uplink transmission mode is a non-codebook based uplink transmission mode.
  • the communications device may be configured to determine that it is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the second uplink transmission mode, wherein the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device.
  • the wireless communications network e.g. gNB
  • the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device.
  • channel reciprocity may not be available for an UL transmission in an UL sub-band of SBFD OFDM symbols since gNB receives the UL transmission using an “UL” antenna panel that is different for DL transmission, and thereby codebook based UL transmission is more suitable.
  • an UL transmission in SBFD OFDM symbols always applies codebook based transmission whilst an UL transmission in UL OFDM symbols applies the UL transmission mode configured by the txConfig.
  • the communications device may be configured to determine that it is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the first uplink transmission mode, wherein the first uplink transmission mode comprises performing transmission of the uplink signal in accordance with first parameters indicated by the wireless communications network (e.g. gNB), while when the one or more symbols are non-SBFD symbols, the communications device may be configured to determine that it is to transmit the uplink signal to the wireless communications network (e.g.
  • the gNB in accordance with one of the first uplink transmission mode and the second uplink transmission indicated via radio resource control (RRC) signalling received from the wireless communications network (e.g. gNB), wherein the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device.
  • RRC radio resource control
  • the network may indicate dynamically what UL transmission mode or modes are to be used by a UE when performing an UL transmission depending on the type of (e.g. SBFD or non-SFBD) OFDM symbols used for that UL transmission.
  • the gNB may independently configure dynamically which UL transmission mode is used for both (or all) types of OFDM symbols.
  • the dynamic downlink indication may indicate that the uplink signal is to be transmitted in accordance with the first uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a first type, and the uplink signal is to be transmitted in accordance with the second uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a second type, where here, the first type is one of SBFD or non-SBFD and the second type is the other of SBFD and non-SBFD.
  • the gNB may configure which UL transmission mode is used for one (or some) type of OFDM symbols; for example, the gNB may dynamically configure the UL transmission mode for non-SFBD symbols, but the UE will always use a pre-configured UL transmission mode (e.g. codebook based UL transmission) for SFBD symbols as described in the arrangements above.
  • a pre-configured UL transmission mode e.g. codebook based UL transmission
  • the dynamic downlink indication may indicate that the uplink signal is to be transmitted in accordance with either the first uplink transmission mode or the second uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a first type, and wherein the uplink signal is to be transmitted by the communications device in accordance with a preconfigured one of the first uplink transmission mode or the second uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a second type, where here, the first type is one of SBFD or non-SBFD and the second type is the other of SBFD and non-SBFD.
  • the network may indicate semi- statically (e.g. via RRC signalling) what UL transmission mode or modes are to be used by a UE when performing an UL transmission depending on the type of (e.g. SBFD or non-SFBD) OFDM symbols used forthat UL transmission.
  • the gNB may configure which UL transmission mode is used for one (or some) type of OFDM symbols; for example, the gNB may configure, semi-statically, the UL transmission mode for non-SFBD symbols, but the UE will always use a pre-configured UL transmission mode (e.g. codebook based UL transmission) for SFBD symbols as described in the arrangements above.
  • the network dynamically indicates the UL transmission mode to the UE.
  • the communications device may be configured to determine whether the communications device is to transmit the uplink signal to the wireless communications network (e.g. the gNB) in accordance with the first uplink transmission mode or the second uplink transmission mode based on a dynamic downlink indication received from the wireless communications network (e.g. gNB).
  • the network can indicate whether a PUSCH or PUCCH uses codebook based UL transmission mode or non-codebook based UL transmission mode.
  • the gNB may use the “TDD” antenna panel for DL transmission and UL reception in different SBFD OFDM symbols, i.e., non-simultaneous DL transmission and UL reception, thereby not causing self-interference, and so it may indicate the UE to use non-codebook based UL transmission in such a case.
  • the gNB may use the “DL” antenna panel for DL transmission and “UL” antenna panel for UL reception for non-SBFD OFDM symbols, in which case, the UE may be indicated to use codebook based UL transmission.
  • the said dynamic indicator is indicated in the DCI, such as the UL grant.
  • the dynamic downlink indication may be received from the wireless communications network (e.g. gNB) within downlink control information (DCI) where the DCI may be an uplink grant which schedules the transmission of the uplink signal. That is, the gNB indicates in the UL grant the UL transmission mode the UE should use on the scheduled PUSCH.
  • DCI downlink control information
  • the said dynamic indicator is indicated in the GC-DCI.
  • the DCI may be a group common DCI (GC-DCI) wherein the GC-DCI is also transmitted by the wireless communications network (e.g. gNB) to one or more other communications devices.
  • the gNB indicates in the GC-DCI, such as in a Slot Format Indicator (SFI) for example, the UL transmission mode the UE should use on corresponding timing (symbols, slots, etc.).
  • SFI Slot Format Indicator
  • the said dynamic indicator is indicated in the RAR.
  • the RAR is used to schedule PUSCH carrying Message 3 of a random access (RACH) process.
  • the UE uses the same UL beam for Message 3 and PRACH preambles. Since the UL radio channel may be different for UL transmissions in SBLD and non-SBLD OLDM symbols, it may not be suitable to use the same UL beam for a PRACH preamble transmitted in SBLD OLDM symbol and a Message 3 PUSCH in UL OLDM symbol, and vice-versa.
  • the RAR indicates whether the UE can assume the same UL beam for the PRACH preamble and Message 3, or not. If the RAR indicates that the UE cannot assume the same UL beam used for PRACH preamble for Message 3, then the RAR also indicates the UL beam and may additionally the precoder for Message 3 UL transmission.
  • the dynamic downlink indication may be received from the wireless communications network (e.g. gNB) within a random access response (RAR) message, wherein the RAR is received in response to the communications device transmitting a random access (RACH) preamble to the wireless communications network (e.g. gNB) to initiate a RACH procedure.
  • RAR random access response
  • gNB may be configured to determine, if the communications device is not able to dynamically determine whether to transmit the uplink signal in accordance with the codebook based uplink transmission mode or the non-codebook based uplink transmission mode and if the uplink signal is to be transmitted by the communications device within one or more sub-band full duplex, SBLD, symbols, that the infrastructure equipment is to receive the uplink signal from the communications device in accordance with the codebook based uplink transmission mode.
  • SBLD sub-band full duplex
  • the network signals one or more channel adjustment factor between the DL and UL antenna panels.
  • the gNB signals one or more channel adjustment factors between the “DL” or “UL” antenna panel and the “TDD” antenna panel, where the channel adjustment factor equalizes the radio channel between the DL and UL among the antenna panels.
  • the communications device may be configured to receive, from the wireless communications network (e.g. gNB), an indication of a channel adjustment factor between a first antenna panel of an infrastructure equipment of the wireless communications network (e.g.
  • the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device based on the received channel adjustment factor.
  • the gNB may determine the channel adjustment factor by calculating the difference between the UE reported downlink measurements from RS (such as CSI-RS or SSB) transmitted using the “DL” antenna panel with the SRS received in from the UE in the “UL” antenna panel.
  • the channel adjustment factor between the “DL” or “UL” antenna panel and the “TDD” panel can be determined using the same method.
  • the infrastructure equipment e.g. gNB
  • the infrastructure equipment may be configured to determine the channel adjustment factor based on a difference between a first signal quality of first reference signals and a second signal quality of second reference signals, wherein the infrastructure equipment (e.g.
  • gNB had transmitted the first reference signals via the first antenna panel to the communications device and received an indication of the first signal quality from the communications device, and wherein the infrastructure equipment (e.g. gNB) had received the second reference signals from the communications device via the second antenna panel and performed measurements on the second reference signals to determine the second signal quality.
  • the infrastructure equipment e.g. gNB
  • the channel adjustment factor is signalled to the UE dynamically using a DCI.
  • the indication of the channel adjustment factor may be received by the communications device from the wireless communications network (e.g. gNB) within a DCI.
  • the channel adjustment factor is semi- statically signalled to the UE using RRC signalling.
  • the indication of the channel adjustment factor may be received by the communications device from the wireless communications network (e.g. gNB) within RRC signalling.
  • the UE uses other DL RS to those indicated by the gNB to determine which precoding and UL beam should be applied for its UL transmission.
  • the communications device determines that it is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the second uplink transmission mode
  • the second uplink transmission mode may comprise performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device based on one or more DL RS which are not part of the indicated set of DL RS.
  • the second uplink transmission mode may comprise performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device without assuming channel reciprocity between the transmission of the uplink signal and reception of one or more DL RS from the wireless communications network.
  • the gNB indicates the corresponding channel adjustment factor for each DL RS, where channel reciprocity cannot be assumed.
  • the communications device may be configured to receive, from the wireless communications network (e.g. gNB) for each of the indicated set of DL RS, an indication of a channel adjustment factor between a first antenna panel of an infrastructure equipment of the wireless communications network (e.g.
  • the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device based on a DL RS of the indicated set of DL RS in combination with the received channel adjustment factor for that DL RS.
  • the gNB indicates the channel adjustment factor between DL RS from “DL” antenna panel and “UL” antenna panel. Additionally or alternatively, the gNB also indicates the channel adjustment factor between DL RS from “TDD” antennal panel an “UL” antenna panel. The UE can then determine which channel adjustment factor to use depending which DL RS it uses to determine the precoding/UL beam for its UL transmission.
  • DCI carries fields with different bit sizes for codebook based UL transmission when compared to noncodebook UL transmission. For example, a field used to indicate TPMI requires many bits for codebook based transmission, while such a field is not needed for non-codebook based transmission. If the total bit size in the DCI is different to what the UE expects, the UE cannot correctly decode the DCI. Even if the total bit size in the DCI is the same as the UE expects it to be, but the fields used to indicate TPMI in the DCI are different, the UE misunderstands the contents of the DCI because of a wrong interpretation of the bit fields.
  • a new DCI format is carried in addition to the legacy DCI format.
  • the legacy DCI format may indicate either the codebook or non-codebook UL transmission mode, while the new DCI format may indicate the other.
  • the communications device may determine that it is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the first uplink transmission mode, and if the DCI has a second format, the communications device may determine that it is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the second uplink transmission mode.
  • the network can control the UE in respect of DCI blind decoding. For example, one search space may be allocated to the legacy DCI format only and another search space may be allocated to the new DCI format only.
  • the indication of either the codebook or the non-codebook UL transmission mode is carried by a Radio Network Temporary Identifier (RNTI).
  • RNTI Radio Network Temporary Identifier
  • the communications device may determine that it is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the first uplink transmission mode, and if the identifier of the DCI is equal to a second identifier, the communications device may determine that it is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the second uplink transmission mode.
  • a Cell-RNTI may be associated with codebook based transmission while another C- RNTI may be associated with non-codebook based transmission. If the RNTI of a DCI is different to either of these C-RNTIs, the UE will fail to decode the DCI, since the UE expects the RNTI of the DCI to be equal to one of these C-RNTIs. By knowing a DQ’s structure based on its RNTI, the UE does not need to assume multiple interpretations for the DCI.
  • one of the TPMI indices is used to indicate the non-codebook based UL transmission mode, whilst the remaining TPMI indices are used to indicate the precoder as per legacy operation.
  • the DCI may comprise an indication of a transmit precoding matrix index, TPMI, field capable of indicating a set of TPMI values, wherein a first TPMI value may indicate that the communications device is to transmit the uplink signal to the wireless communications network (e.g.
  • TPMI points to an index in a lookup table consisting of precoding weights for each UE antenna port.
  • one of the TPMI field indices is repurposed and used to indicate the noncodebook based UL transmission mode.
  • one of the SRS Resource Indicator (SRI) values may be used to indicate the non-codebook UL transmission mode.
  • the DCI comprises an indication of a sounding reference signal resource indicator, SRI, field capable of indicating a set of SRI values, wherein a first SRI value may indicate that the communications device is to transmit the uplink signal to the wireless communications network (e.g. gNB) in accordance with the second uplink transmission mode by performing transmission of the uplink signal using a second uplink beam independently determined by the communications device, and wherein one or more other SRI values to the first SRI value may each indicate that the communications device is to transmit the uplink signal to the wireless communications network (e.g.
  • the method begins in step SI.
  • the method comprises, in step S2, determining that the communications device has an uplink signal to transmit to the wireless communications network (e.g. to the infrastructure equipment).
  • the process comprises determining, based on either a parameter of the uplink signal or a dynamic downlink indication received from the wireless communications network (e.g. from the infrastructure equipment), whether the communications device is to transmit the uplink signal to the wireless communications network (e.g. to the infrastructure equipment) in accordance with a first uplink transmission mode or a second uplink transmission mode.
  • the method then comprises, in step S4, transmitting the uplink signal to the wireless communications network (e.g. to the infrastructure equipment) in accordance with the determined one of the first uplink transmission mode and the second uplink transmission mode.
  • the process ends in step S5.
  • infrastructure equipment and/or communications devices as herein defined may be further defined in accordance with the various arrangements and embodiments discussed in the preceding paragraphs. It would be further appreciated by those skilled in the art that such infrastructure equipment and communications devices as herein defined and described may form part of communications systems other than those defined by the present disclosure, provided that these are within the scope of the claims.
  • Paragraph 1 A method of operating a communications device configured to transmit signals to and/or to receive signals from a wireless communications network, the method comprising determining that the communications device has an uplink signal to transmit to the wireless communications network, determining, based on either a parameter of the uplink signal or a dynamic downlink indication received from the wireless communications network, whether the communications device is to transmit the uplink signal to the wireless communications network in accordance with a first uplink transmission mode or a second uplink transmission mode, and transmitting the uplink signal to the wireless communications network in accordance with the determined one of the first uplink transmission mode and the second uplink transmission mode.
  • a method wherein the first uplink transmission mode comprises performing transmission of the uplink signal in accordance with first parameters indicated by the wireless communications network, wherein the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device, and wherein the first parameters comprise first precoding weights and/or a first uplink beam and the second parameters comprise second precoding weights and/or a second uplink beam.
  • Paragraph 3 A method according to Paragraph 2, wherein the first parameters are indicated in a codebook received from the wireless communications network, the codebook indicating multiple sets of parameters including the first parameters, and wherein the first uplink transmission mode is a codebook based uplink transmission mode and the second uplink transmission mode is a non-codebook based uplink transmission mode.
  • Paragraph 4 A method according to any of Paragraphs 1 to 3, wherein the parameter of the uplink signal is a type of one or more symbols in which the communications device is to transmit the uplink signal, wherein the type of the one or more symbols is either sub-band full duplex, SBFD, or non-SBFD.
  • Paragraph 5 A method according to Paragraph 4, wherein when the one or more symbols are SBFD symbols, the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with the first uplink transmission mode, wherein the first uplink transmission mode comprises performing transmission of the uplink signal in accordance with first parameters indicated by the wireless communications network.
  • Paragraph 6 A method according to Paragraph 5, wherein when the one or more symbols are non- SBFD symbols, the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with the second uplink transmission mode, wherein the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device.
  • Paragraph 7 A method according to Paragraph 5 or Paragraph 6, wherein when the one or more symbols are non-SBFD symbols, the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with one of the first uplink transmission mode and the second uplink transmission indicated via radio resource control, RRC, signalling received from the wireless communications network, wherein the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device.
  • RRC radio resource control
  • Paragraph 8 A method according to any of Paragraphs 4 to 7, wherein when the one or more symbols are SBFD symbols, the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with one of the first uplink transmission mode and the second uplink transmission indicated via first RRC signalling received from the wireless communications network, and when the one or more symbols are non-SBFD symbols, the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with one of the first uplink transmission mode and the second uplink transmission indicated via second RRC signalling received from the wireless communications network.
  • Paragraph 9 A method according to any of Paragraphs 1 to 8, wherein the dynamic downlink indication is received from the wireless communications network within downlink control information, DCI.
  • Paragraph 10 A method according to Paragraph 9, wherein the DCI is an uplink grant which schedules the transmission of the uplink signal.
  • Paragraph 11 A method according to Paragraph 9 or Paragraph 10, wherein the DCI is a downlink grant which schedules the transmission of the uplink signal in response to the communications device receiving downlink data from the wireless communications network.
  • Paragraph 12 A method according to any of Paragraphs 9 to 11, wherein the DCI is a group common DCI, GC-DCI, wherein the GC-DCI is also transmitted by the wireless communications network to one or more other communications devices.
  • Paragraph 14 A method according to any of Paragraphs 9 to 13, wherein if the DCI has a first format, the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with the first uplink transmission mode, and if the DCI has a second format, the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with the second uplink transmission mode.
  • Paragraph 26 A method according to any of Paragraphs 1 to 25, wherein if the communications device determines that it is to transmit the uplink signal to the wireless communications network in accordance with the second uplink transmission mode, the second uplink transmission mode comprises performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device without assuming channel reciprocity between the transmission of the uplink signal and reception of one or more DL RS from the wireless communications network.
  • a method of operating an infrastructure equipment forming part of a wireless communications network comprising determining that infrastructure equipment is to receive an uplink signal from a communications device, transmitting, to the communications device, a dynamic downlink indication which indicates whether the communications device is to transmit the uplink signal to the wireless communications network in accordance with a first uplink transmission mode or a second uplink transmission mode, and receiving the uplink signal from the communications device in accordance with the indicated one of the first uplink transmission mode and the second uplink transmission mode.
  • the dynamic downlink indication indicates that the uplink signal is to be transmitted in accordance with either the first uplink transmission mode or the second uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a first type
  • the infrastructure equipment determines that the uplink signal is to be transmitted in accordance with a preconfigured one of the first uplink transmission mode or the second uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a second type, and wherein the first type is one of SBFD or non-SBFD and the second type is the other of SBFD and non-SBFD.
  • Paragraph 34 A method according to any of Paragraphs 29 to 33, wherein the dynamic downlink indication indicates that the uplink signal is to be transmitted in accordance with the first uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a first type, and the uplink signal is to be transmitted in accordance with the second uplink transmission mode if the one or more symbols in which the uplink signal is to be transmitted are of a second type, wherein the first type is one of SBFD or non-SBFD and the second type is the other of SBFD and non-SBFD.
  • Paragraph 35 A method according to any of Paragraphs 29 to 34, wherein the dynamic downlink indication is transmitted to the communications device within downlink control information, DCI.
  • Paragraph 36 A method according to Paragraph 35, wherein the DCI is an uplink grant which schedules the transmission of the uplink signal.
  • Paragraph 38 A method according to any of Paragraphs 35 to 37, wherein the DCI is a group common DCI, GC-DCI, wherein the GC-DCI is also transmitted by the infrastructure equipment to one or more other communications devices.
  • Paragraph 39 A method according to any of Paragraphs 35 to 38, wherein if the DCI has a first size, the uplink signal is to be transmitted in accordance with the first uplink transmission mode, and if the DCI has a second size, the uplink signal is to be transmitted in accordance with the second uplink transmission mode.
  • Paragraph 40 A method according to any of Paragraphs 35 to 39, wherein if the DCI has a first format, the uplink signal is to be transmitted in accordance with the first uplink transmission mode, and if the DCI has a second format, the uplink signal is to be transmitted in accordance with the second uplink transmission mode.
  • Paragraph 43 A method according to any of Paragraphs 35 to 42, wherein the DCI comprises an indication of a transmit precoding matrix index, TPMI, field capable of indicating a set of TPMI values, wherein a first TPMI value indicates that the uplink signal is to be transmitted in accordance with the second uplink transmission mode by the communications device performing precoding of the uplink signal in accordance with second precoding weights independently determined by the communications device, and wherein one or more other TPMI values to the first TPMI value each indicate that the uplink signal is to be transmitted in accordance with the first uplink transmission mode by the communications device performing precoding of the uplink signal in accordance with first precoding weights associated with that TPMI value.
  • TPMI transmit precoding matrix index
  • Paragraph 46 A method according to any of Paragraphs 29 to 45, comprising transmitting, to the communications device, an indication of a channel adjustment factor between a first antenna panel of the infrastructure equipment and a second antenna panel of the infrastructure equipment, wherein if the uplink signal is to be transmitted to the infrastructure equipment in accordance with the second uplink transmission mode, the second uplink transmission mode comprises the communications device performing transmission of the uplink signal in accordance with second parameters independently determined by the communications device based on the indicated channel adjustment factor.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'un dispositif de communication configuré pour transmettre des signaux à un réseau de communication sans fil et/ou pour recevoir des signaux en provenance du réseau de communication sans fil. Le procédé consiste à déterminer que le dispositif de communication présente un signal de liaison montante à transmettre au réseau de communication sans fil, à déterminer, sur la base soit d'un paramètre du signal de liaison montante, soit d'une indication de liaison descendante dynamique reçue du réseau de communication sans fil, si le dispositif de communication doit transmettre le signal de liaison montante au réseau de communication sans fil selon un premier mode de transmission en liaison montante ou un second mode de transmission en liaison montante, et à transmettre le signal de liaison montante au réseau de communication sans fil selon le mode déterminé entre le premier mode de transmission en liaison montante et le second mode de transmission en liaison montante.
PCT/EP2025/058830 2024-04-04 2025-04-01 Configuration de transmission en liaison montante pour sbfd Pending WO2025210020A1 (fr)

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EP24168596.5 2024-04-04

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Citations (3)

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EP3545716A1 (fr) 2017-01-06 2019-10-02 Sony Corporation Appareils et procédés de télécommunications sans fil
WO2024030002A1 (fr) * 2022-08-05 2024-02-08 삼성전자 주식회사 Procédé et dispositif de planification pour une communication en duplex intégral dans un système de communication sans fil
WO2024234729A1 (fr) * 2024-01-26 2024-11-21 Lenovo (Beijing) Limited Transmission pusch

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EP3545716A1 (fr) 2017-01-06 2019-10-02 Sony Corporation Appareils et procédés de télécommunications sans fil
WO2024030002A1 (fr) * 2022-08-05 2024-02-08 삼성전자 주식회사 Procédé et dispositif de planification pour une communication en duplex intégral dans un système de communication sans fil
EP4568384A1 (fr) * 2022-08-05 2025-06-11 Samsung Electronics Co., Ltd. Procédé et dispositif de planification pour une communication en duplex intégral dans un système de communication sans fil
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