US-12628178-B2 - User equipment and network node involved in the transmission of signals using transmission parameters determined according to transmission configuration indication

US12628178B2US 12628178 B2US12628178 B2US 12628178B2US-12628178-B2

Abstract

The present disclosure relates to a user equipment (UE), a network node, and communication methods respectively for a UE and a network node. The UE comprises a transceiver which, in operation, receives, on a physical downlink control channel, PDCCH, downlink control information, DCI, for scheduling a plurality of transmissions or receptions between the UE and a plurality of transmission and reception points, TRPs, on a plurality of channels, the DCI including one or more indicators indicating one or more respective transmission parameters, and circuitry which, in operation, obtains, based on the one or more indicators and on a configuration, a plurality of values respectively of the one or more transmission parameters. The transceiver, in operation, performs the plurality of transmissions or receptions using a respective one of the plurality of values of the one or more transmission parameters for each of the plurality of transmissions or receptions.

Inventors

Ankit BHAMRI
Hidetoshi Suzuki

Assignees

PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA

Dates

Publication Date: 20260512
Application Date: 20240702
Priority Date: 20181112

Claims (12)

1 . A user equipment (UE), comprising: circuitry, which, in operation, determines, based on one or more downlink control information (DCI) indicators and on a configuration associated with a transmission configuration indication (TCI) field, one or more transmission parameters; a transceiver, which, in operation, performs receptions on a physical downlink shared channel (PDSCH) using the one or more transmission parameters, wherein the one or more transmission parameters are determined in reference to a first table for the PDSCH in a case the configuration associated with the TCI field is for a single state, the one or more transmission parameters are determined in reference to a second table for the PDSCH different from the first table for the PDSCH in a case the configuration associated with the TCI field is for multiple states, and indices in the second table are represented by the same number of bits used to represent indices in the first table.
2 . The UE according to claim 1 , wherein the one or more transmission parameters includes a value of DMRS (demodulation reference signal) antenna ports.
3 . The UE according to claim 1 , wherein a number of entries in the second table is larger than a number of entries in the first table.
4 . The UE according to claim 1 , wherein an entry modified or added in the second table relative to the first table indicates multiple DMRS (demodulation reference signal) antenna ports.
5 . The UE according to claim 1 , wherein a subset of values of the TCI field is used to indicate the single state, and other values of the TCI field are used to indicate the multiple states.
6 . The UE according to claim 1 , wherein the second table is enabled in a case one code word is enabled.
7 . The UE according to claim 1 , wherein the second table indicates a number of DMRS (demodulation reference signal) CDM (code division multiplexing) groups without data and indicates DMRS ports.
8 . The UE according to claim 1 , wherein values of entries in the second table relate to a single DMRS (demodulation reference signal) antenna port, and values of other entries in the second table relate to multiple DMRS antenna ports.
9 . The UE according to claim 1 , wherein twelve entries indexed 0-11 in the second table are included in the first table and indexed 0-11, while an entry indexed 12 in the second table is not included in the first table.
10 . The UE according to claim 1 , wherein the indices are represented by 4 bits in the first table and the second table.
11 . A communication method performed by a user equipment (UE), comprising: determining, based on one or more downlink control information (DCI) indicators and on a configuration associated with a transmission configuration indication (TCI) field, one or more transmission parameters; and performing receptions on a physical downlink shared channel (PDSCH) using the one or more transmission parameters, wherein the one or more transmission parameters are determined in reference to a first table for the PDSCH in a case the configuration associated with the TCI field is for a single state, the one or more transmission parameters are determined in reference to a second table for the PDSCH different from the first table for the PDSCH in a case the configuration associated with the TCI field is for multiple states, and indices in the second table are represented by the same number of bits used to represent indices in the first table.
12 . An integrated circuit comprising: a processing circuit configured to control a process of a user equipment (UE), the process comprising: determining, based on one or more downlink control information (DCI) indicators and on a configuration associated with a transmission configuration indication (TCI) field, one or more transmission parameters; and performing receptions on a physical downlink shared channel (PDSCH) using the one or more transmission parameters, wherein the one or more transmission parameters are determined in reference to a first table for the PDSCH in a case the configuration associated with the TCI field is for a single state, the one or more transmission parameters are determined in reference to a second table for the PDSCH different from the first table for the PDSCH in a case the configuration associated with the TCI field is for multiple states, and indices in the second table are represented by the same number of bits used to represent indices in the first table.

Description

BACKGROUND 1. Technical Field The present disclosure relates to transmission and reception of signals in a communication system. In particular, the present disclosure relates to methods and apparatuses for such transmission and reception. 2. Description of the Related Art The 3rd Generation Partnership Project (3GPP) works at technical specifications for the next generation cellular technology, which is also called fifth generation (5G) including “New Radio” (NR) radio access technology (RAT), which operates in frequency ranges up to 100 GHz. The NR is a follower of the technology represented by Long Term Evolution (LTE) and LTE Advanced (LTE-A). For systems like LTE and NR, further modifications and options may facilitate efficient operation of the communication system as well as particular devices pertaining to the system. BRIEF SUMMARY One non-limiting and exemplary embodiment facilitates physical downlink control channel (PDCCH) signaling for multi-TRP (transmission and reception point) communication. In one general aspect, the techniques disclosed herein feature a user equipment (UE) comprising a transceiver which, in operation, receives, on a physical downlink control channel, PDCCH, downlink control information, DCI, for scheduling a plurality of transmissions or receptions between the UE and a plurality of transmission and reception points, TRPs, on a plurality of channels, the DCI including one or more indicators indicating one or more respective transmission parameters, and circuitry which, in operation, obtains, based on the one or more indicators and on a configuration, a plurality of values respectively of the one or more transmission parameters, wherein the transceiver, in operation, performs the plurality of transmissions or receptions using a respective one of the plurality of values of the one or more transmission parameters for each of the plurality of transmissions or receptions. It should be noted that general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof. Additional benefits and advantages of the disclosed embodiments will become apparent from the specification and drawings. The benefits and/or advantages may be individually obtained by the various embodiments and features of the specification and drawings, which need not all be provided in order to obtain one or more of such benefits and/or advantages. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS In the following, exemplary embodiments are described in more detail with reference to the attached figures and drawings. FIG. 1 shows an exemplary architecture for a 3GPP NR system including exemplary user and control plane architecture for the LTE eNB, gNB, and UE; FIG. 2 shows an exemplary illustration of transmission of two PDSCHs to a single UE; FIG. 3 shows an exemplary illustration of a single PDCCH transmission from one TRP scheduling two PDSCH transmissions from two TRPs; FIG. 4 is a graph showing front-loaded demodulation reference symbol configurations for data channels; FIG. 5 is a block diagram showing the structure of UE and of a network node; FIG. 6 is a flow chart showing a method for a UE and a method for a network node; FIG. 7 is a block diagram showing an exemplary structure of UE parameter obtaining circuitry; FIG. 8 is a block diagram showing an exemplary structure of UE parameter obtaining circuitry; FIG. 9 is an example of RRC code including values of a multi-TRP combination table; FIG. 10 is an example of RRC code including values of a multi-TRP combination table for DMRS indication; FIG. 11 is an example of RRC code including values of a multi-TRP combination table for TCI state indication; FIG. 12 is an example of RRC code including an enabling parameter for a multi-TRP combination table; FIG. 13 is an example of RRC code including an enabling parameter for a multi-TRP combination table for DMRS indication; and FIG. 14 is an example of RRC code including an enabling parameter for multi-TRP combination table for TCI state indication. DETAILED DESCRIPTION FIG. 1 shows an exemplary example of a communication system including a base station and a terminal and a core network. Such communication system may be a 3GPP system such as NR and/or LTE and/or UMTS. For example, as illustrated in FIG. 1, the base station (BS) may be a gNB (gNodeB, e.g., an NR gNB) or an eNB (eNodeB, e.g., an LTE gNB). However, the present disclosure is not limited to these 3GPP systems or to any other systems. Even though the embodiments and exemplary implementations are described using some terminology of 3GPP systems, the present disclosure is also applicable to any other communication systems, and in particular in any cellular, wireless and/or mobile systems. The NR is planned to facilitate providing a single technical framework addressing several usage scenarios, requirements and deployment scenarios defined including,