Uplink transmission with only uplink transmission reception points

Abstract

The present application relates to methods, apparatuses and systems for acquiring spatial information to perform a random access procedure with a transmission reception point using only uplink. In an exemplary aspect, a method of wireless communication includes determining, by a terminal device, a spatial domain parameter based on information about a reference signal from a first base station, and performing, by the terminal device, a transmission to a second base station in accordance with the spatial domain parameter.

Description

Technical Field

[0001] This patent document relates to digital communications. Background Technology

[0002] Mobile communication technology is driving the world toward an increasingly interconnected and networked society. The rapid growth and technological advancements in mobile communications have led to greater demands for capacity and connectivity. Other aspects, such as energy consumption, equipment cost, spectrum efficiency, and latency, are also crucial for meeting the needs of various communication scenarios. Various technologies, including new methods for providing higher quality of service, longer battery life, and improved performance, are being discussed. Summary of the Invention

[0003] The technology described in this patent document relates to acquiring spatial information to perform a random access procedure using only an uplink transmission receiving point.

[0004] In an exemplary aspect, the wireless communication method includes: a terminal device determining spatial domain parameters based on information about a reference signal from a first base station, and the terminal device performing a transmission to a second base station based on the spatial domain parameters.

[0005] In another exemplary aspect, the wireless communication method includes: a first base station sending information about a reference signal to a terminal device so that the terminal device can determine spatial domain parameters for transmission to a second base station.

[0006] In another exemplary aspect, a communication device is disclosed. This device includes a processor configured to implement the methods described above.

[0007] In yet another exemplary aspect, a computer program storage medium is disclosed. This computer program storage medium includes code stored thereon. When executed by a processor, this code causes the processor to implement the described methods.

[0008] These and other aspects are described in this document. Attached Figure Description

[0009] Figure 1 An exemplary four-step process is shown for both Contention-Based Random Access (CBRA) and Contention-Free-Based Random Access (CFRA).

[0010] Figure 2 An exemplary two-step process for CBRA and CFRA is shown.

[0011] Figure 3An exemplary heterogeneous network (HetNet) scenario according to one or more embodiments of the present technology is illustrated.

[0012] Figure 4 Exemplary scenarios according to one or more embodiments of the present technology are shown.

[0013] Figure 5A This is a flowchart representation of a wireless communication method according to one or more embodiments of the present technology.

[0014] Figure 5B This is a flowchart representation of a wireless communication method according to one or more embodiments of the present technology.

[0015] Figure 6 An example of a wireless communication system to which one or more embodiments of the present technology can be applied is shown.

[0016] Figure 7 This is a block diagram representation of a radio station to which one or more embodiments of the technology according to this technology can be applied. Detailed Implementation

[0017] The use of chapter headings in this document is for readability purposes only and does not limit the scope of the embodiments and techniques disclosed in each chapter to that chapter only. Furthermore, some embodiments are described with reference to the 3GPP Fifth Generation (5G) New Radio (NR) or Sixth Generation (6G) standards to facilitate understanding that the described techniques can be implemented in different wireless systems that implement protocols other than NR or 6G.

[0018] Random-Access (RA) is the process by which a terminal requests network access for data transmission. In wireless communication networks, this process can be implemented in two ways: Contention-Based Random Access (CBRA) and Contention-Free Random Access (CFRA). Two types of random access procedures are supported: a four-step RA procedure that begins with a message called MSG1 and a two-step RA type that begins with a message called MSGA.

[0019] Figure 1An exemplary four-step process for CBRA and CFRA is illustrated. The MSG1 for the four-step RA type includes a preamble on the Physical Random Access Channel (PRACH). After the MSG1 transmission, the User Equipment (UE) monitors for a response from the network within a configured window. For CFRA, the network allocates a dedicated preamble for the MSG1 transmission. Upon receiving a random access response from the network, the UE terminates the random access procedure. For CBRA, upon receiving the random access response, the UE transmits MSG3 using the uplink (UL) grant scheduled in the response and monitors for contention resolution. If contention resolution is unsuccessful after the MSG3 (re)transmission, the UE returns to the MSG1 transmission.

[0020] A two-step RA type MSGA includes a preamble on the PRACH and a payload on the Physical Uplink Shared Channel (PUSCH). Figure 2 The exemplary two-step procedures for CBRA and CFRA are illustrated. After the MSGA transmission, the UE monitors for responses from the network within a configured window. For CFRA, a dedicated preamble and PUSCH resources are configured for the MSGA transmission. Upon receiving a network response, the UE terminates the random access procedure. For CBRA, if contention resolution is successful after receiving a network response, the UE terminates the random access procedure. If a backoff indication is received in a response message called MSGB, the UE performs an MSG3 transmission using the UL grant scheduled in the backoff indication and monitors for contention resolution. If contention resolution is unsuccessful after the MSG3 (re)transmission, the UE returns to the MSGA transmission.

[0021] One of the key features of New Radio (NR) technology in fifth-generation (5G) mobile communication systems is support for enhanced Multiple Input Multiple Output (MIMO) schemes. MIMO communication systems employ multiple antennas at both the transmitter and receiver ends to utilize the spatial domain and enable the simultaneous transmission of multiple data streams on the same frequency band. This spatial multiplexing capability is a key factor in achieving high data rates and improving link reliability in MIMO systems.

[0022] To enhance MIMO, heterogeneous networks (HetNets) are becoming increasingly common in network implementations. A HetNet (e.g., a network or base station) can include multiple Transmission Reception Points (mTRPs). Some TRPs have higher transmit power capabilities and are referred to as macro TRPs. Some TRPs have lower transmit power capabilities and are referred to as micro TRPs. Some TRPs only receive transmissions and do not perform transmissions to the terminal device (e.g., do not support or disable downlink transmission). These TRPs are referred to as uplink-only TRPs. In some embodiments, a TRP can be a base station. In some embodiments, a base station can include multiple TRPs, deployed in a centralized manner (e.g., multiple elements on a transmit / receive panel) or in a distributed manner. In some embodiments, multiple TRPs with the same or different uplink / downlink capabilities are distributed as a combination of macro / micro cells within a coverage area to provide network access to the UE. The terminal device is also referred to as a UE.

[0023] Figure 3 An exemplary HetNet scenario according to one or more embodiments of the present technology is shown. Figure 3 As shown, in some embodiments, the UE connects to a Non-Coherent Joint Receiving (NCJR) TRP 301 and / or multiple Coherent Joint Receiving (CJR) TRPs 303a, 303b, and 303c. The NCJR and / or CJR TRPs can be TRPs that support both downlink and uplink, or TRPs that support only uplink transmission. For example, downlink and uplink TRPs can be used for cell center data transmission, while uplink-only TRPs can be used for cell edge transmission or load balancing. It should be noted that a UL-only TRP can be a normal TRP where DL is disabled or turned off (e.g., in a power-saving state). A UL-only TRP can also be a normal TRP that does not provide DL services to the UE (e.g., DL services are provided by another TRP). In some embodiments, DL and UL TRPs can be referred to as macro TRPs, while the UL-only TRP can be referred to as a micro TRP.

[0024] Currently, for MIMO, spatial relationships are not indicated / configured for the uplink portion of the random access procedure (e.g., Msg1 and Msg3 of the four-step RA type, or MSGA of the two-step RA type including the RA preamble and PUSCH payload). This is because, for DL ​​and UL TRP, spatial relationships can be indicated to the UE using downlink signals (e.g., synchronization signals and Physical Broadcast Channel (PBCH) blocks (SSBs) and / or Channel State Information (CSI) reference signals (CSI-RS)). For example, in the current RACH procedure, SSB information is indicated by the network in DCI signaling or selected by the UE after evaluating the channel state (e.g., checking the Reference Signal Received Power (RSRP) value). Based on the SSB information, the UE can select a preamble associated with the SSB. In some embodiments, when the base station triggers the RACH procedure, the random-access occupancy (RO) is indicated by using a mask based on the RO list corresponding to the indicated or selected SSB.

[0025] However, for UL-only TRPs, the UE cannot determine the spatial relationships for UL transmissions used in the PRACH procedure, or for subsequent UL transmissions corresponding to the UL-only TRP, from the SSB / CSI-RS. This document discloses techniques that can be implemented in various embodiments to enable the UE to acquire spatial information to perform random access procedures using UL-only TRPs, and to use spatial information for subsequent uplink transmissions with UL-only TRPs. In some embodiments, information regarding uplink reference signals (e.g., sounding reference signals (SRS)) can be used to indicate the spatial information used for communicating with UL-only TRPs.

[0026] Figure 4 An exemplary scenario according to one or more embodiments of the present technology is illustrated. In this example, UE 401 establishes initial access to TRP 403. The UE then performs a random access procedure to obtain access to UL-only TRP 405. To ensure proper spatial multiplexing of uplink transmissions between the UE and UL-only TRP 405, the UE can obtain spatial relationship information from TRP 403 based on information carried in the SSB and / or RO.

[0027] Figure 5AThis is a flowchart representation of a wireless communication method according to one or more embodiments of the present technology. Method 500 includes, at operation 510, a terminal device determining spatial domain parameters based on information about a reference signal from a first base station. Method 500 also includes, at operation 520, a terminal device performing a transmission to a second base station based on the spatial domain parameters.

[0028] Figure 5B This is a flowchart representation of a wireless communication method according to one or more embodiments of the present technology. Method 550 includes, at operation 560, a first base station sending information about a reference signal to a terminal device so that the terminal device can determine spatial domain parameters for transmission to a second base station.

[0029] In some embodiments, spatial domain parameters include at least one of spatial relationships, spatial filters, beam parameters, antenna parameters, antenna group parameters, panel parameters, panel group parameters, or quasi-co-location (QCL) parameters. In some embodiments, transmission to the second base station includes transmissions during a random access procedure. QCL parameters refer to a predefined set of parameters reflecting several aspects of channel measurements. For example, QCL parameters may include the following types: 'typeA': {Doppler shift, Doppler spread, average delay, delay spread}; 'typeB': {Doppler shift, Doppler spread}; 'typeC': {Doppler shift, average delay}; 'typeD': {spatial Rx parameters}. In some embodiments, typeD QCL parameters can be used to determine spatial domain parameters.

[0030] In some embodiments, information about the reference signal is indicated by RRC signaling from the first base station. In some embodiments, the information about the reference signal includes at least one of the following: information about the probe reference signal (SRS) resource, or information about the Transmission Configuration Indicator (TCI) status. In some embodiments, the information about the SRS resource is based on at least one of the following: a codebook-based (CB) SRS resource set, a non-codebook-based (NCB) SRS resource set, a beam-managed SRS resource set, or an SRS resource set configured by the first base station. In some embodiments, the information about the SRS resource is determined based on the index of the SRS resource in the SRS resource set. In some embodiments, the information about the reference signal is indicated by information associated with a random access procedure. In some embodiments, the random access procedure is initiated by a Physical Downlink Control Channel (PDCCH) command, and the information about the reference signal is carried in Downlink Control Information (DCI) signaling. In some embodiments, fields in DCI signaling configured as indexes of synchronization signals or physical broadcast channels (SS / PBCH) are interpreted as indicating information about reference signals.

[0031] In some embodiments, information about the reference signal is determined based on an index associated with the random access procedure. In some embodiments, the index associated with the random access procedure includes at least one of the following: CFRA timing identifier (ID), random access channel timing ID, CFRA resource ID, physical random access channel (PRACH) configuration ID, synchronization signal block (SSB) ID, or preamble ID. In some embodiments, the reference signal is associated with the index associated with the random access procedure.

[0032] In some embodiments, a reference signal is associated with an indicated TCI state. In some embodiments, an index associated with a random access procedure indicates whether the indicated TCI state is suitable for determining information about the reference signal used to determine spatial domain parameters, for example, for transmissions associated with the random access procedure. In some embodiments, a PDCCH command initiating a random access procedure includes information indicating whether the indicated TCI state is suitable for determining information about the reference signal used to determine spatial domain parameters, for example, for transmissions associated with the random access procedure. In some embodiments, the information regarding whether the indicated TCI state is suitable for determining information about the reference signal used to determine spatial domain parameters is provided to the terminal device for at least one of a PRACH index list, a bandwidth part (BWP), a serving cell, or a frequency band, for example, for determining spatial domain parameters of uplink transmissions associated with a PRACH index list, BWP, serving cell, or frequency band. In some embodiments, the indicated TCI state is used to determine spatial domain parameters of a transmission to a first base station. In some embodiments, the indicated TCI state is a TCI state used only for uplink transmissions or for both uplink and downlink transmissions.

[0033] In some embodiments, TCI states in a TCI state set are associated with a reference signal. In some embodiments, a TCI state includes at least one of the following: an uplink TCI state, or a TCI state used for both uplink and downlink transmission. In some embodiments, a TCI state is selected from a TCI state set based on Radio Resource Control (RRC) signaling, Medium Access Control (MAC) control elements, or Downlink Control Information (DCI) signaling. In some embodiments, a TCI state set is an active TCI state set activated by a MAC CE. In some embodiments, a TCI state is indicated by a PDCCH command. In some embodiments, a TCI state is determined based on the relationship between an index associated with a random access procedure and entries or code points in the TCI state set.

[0034] In some embodiments, the first base station is configured to perform both uplink and downlink transmissions, and the second base station is configured to perform only uplink transmissions.

[0035] Detailed information about the above technology is further discussed in the embodiments below.

[0036] Example 1 This embodiment includes several different examples that enable the UE to determine spatial domain information based on reference signals. The different examples are independent of each other and can be combined with each other to arrive at a suitable implementation of the disclosed technology.

[0037] Example 1 In some embodiments, uplink transmission from the UE to the UL TRP only includes transmissions during the random access procedure, such as the RA preamble, MSG1, MSGA, the RA preamble in the MSGA, the PUSCH payload in the MSGA, and / or MSG3. The Random-Access Channel (RACH) procedure can be a CFRA procedure initiated by the UE or a CFRA procedure initiated / triggered by the base station.

[0038] Example 2 Spatial domain information includes spatial domain parameters. Spatial domain parameters can indicate spatial relationships, spatial filters, beam parameters, antenna parameters, antenna group parameters, panel parameters, panel group parameters, or QCL parameters.

[0039] Example 3 The reference signal can be an uplink reference signal, such as a probe reference signal. The reference signal can be a Transmission Configuration Indicator (TCI) status, a UL TCI status, an indicated TCI status, or a UL-indicated TCI status. The reference signal can be associated with an SRS resource, a TCI status, a UL TCI status, an indicated TCI status, or a UL-indicated TCI status.

[0040] The indicated TCI state is the TCI state used for both downlink and uplink transmissions. The uplink indicated TCI state refers to the uplink TCI state within the indicated TCI state set; for example, the indicated TCI state may also be referred to as the unified TCI state and is indicated by the code points of the TCI state set. The use of the indicated TCI state (or unified TCI state) can be extended to enable uplink transmissions with only UL TRP (e.g., PRACH transmissions).

[0041] In some embodiments, SRS resources are configured for a target TRP, i.e., a TRP that is expected to receive UL transmissions. The target TRP may be a UL-only TRP.

[0042] Example 4 The reference signal can be determined based on Radio Resource Control (RRC) parameters configured by the base station (e.g., for RACH procedures initiated by the UE). The RRC parameter can be at least one of the following: RACH-ConfigCommon, RACH-ConfigGeneric, RACH-ConfigDedicated, CFRA, CFRA occasion, CFRA-SSB-Resource, CFRA-CSIRS-Resource, CFRA-TwoStep, MsgA-PUSCH-Resource, or MsgA-PUSCH-Config.

[0043] Example 5 The reference signal can be determined based on the PDCCH command sent by the base station (e.g., for the RACH procedure initiated / triggered by the base station).

[0044] The reference signal can be indicated by DCI format 1_0 for a random access procedure initiated by a PDCCH command. Alternatively or additionally, the reference signal can be indicated by DCI format 1_0 for a random access procedure initiated by a PDCCH command using the SS / PBCH index field. For example, the SS / PBCH index field can be reinterpreted as a field used to indicate the reference signal.

[0045] Example 6 The reference signal can be determined based on the RACH index. The RACH index can be at least one of the following: CFRA timing identifier (ID), RACH timing (RO) ID, CFRA resource ID, PRACH configuration ID (e.g., prach-ConfigurationIndex), SSB ID, or preamble ID.

[0046] In some embodiments, the RACH index is associated with a reference signal (or the reference signal is associated with the RACH index). This association can be configured by the network to the UE via RRC signaling, Media Access Control (MAC) control element (CE), or DCI signaling.

[0047] In the case of UL TRP only, as mentioned above, the UE cannot rely on SSB evaluation because UL TRP only cannot transmit SSB. To address this issue, in some embodiments, the network can indicate a RACH index to the UE, enabling the UE to determine the RACH transmission (e.g., preamble) based on the indicated RACH index from the network.

[0048] Example 7 In some embodiments, the reference signal may be determined based on an indicated TCI state (also known as a unified TCI state). The unified TCI state may be an indicated UL TCI state, or an indicated joint TCI state used for both UL and DL transmissions. The unified TCI state may be applied to the transmission of at least one of PDCCH, Physical Downlink Shared Channel (PDSCH), CSI-RS, Physical Uplink Control Channel (PUCCH), PUSCH, and / or SRS. In some embodiments, the unified TCI state is indicated in DCI format 1_1 or 1_2 or in MAC CE.

[0049] In some embodiments, if the DL and UL TRP provide RACH configuration (e.g., information on preambles, ROs, and / or SSBs, and the relationships between them) for UL TRP only, in addition to providing RACH configuration for themselves, it is necessary to distinguish whether information about a reference signal is required (e.g., if the RACH process is for both the DL and UL TRP, a given reference signal is not required; in a RACH process for UL TRP only, a reference signal is required). One or more solutions can be used to address this issue: Solution 1: In some embodiments, the RACH index is associated with information indicating whether a given reference signal for a RACH procedure corresponding to the RACH index can be determined based on the unified TCI state, or with information indicating whether the unified TCI state can be used to determine the spatial domain parameters of the UL transmission corresponding to the RACH procedure.

[0050] For example, a RACH index can be associated with an SSB. Some SSBs are associated with information indicating whether a given reference signal for a RACH procedure corresponding to a RACH index can be determined based on a unified TCI state, or with information indicating whether a unified TCI state can be used to determine the spatial domain parameters of a UL transmission. If an SSB associated with this information indicates that a given reference signal for a RACH procedure corresponding to a RACH index can be determined based on a unified TCI state, then the corresponding RACH procedure can be for a UL TRP only, and the unified TCI state can be used to determine the spatial domain parameters of a UL transmission corresponding to the RACH procedure.

[0051] Solution 2: Information indicating whether the unified TCI status can be used to determine the spatial domain parameters of UL transmission can be provided to the UE via the PDCCH command that initiates the PRACH procedure. Alternatively or additionally, this information is provided to the UE via RRC signaling or MAC CE for the PRACH procedure indexed by RACH.

[0052] Solution 3: Information indicating whether the unified TCI status can be used to determine the spatial domain parameters of UL transmission is provided to the UE in the PRACH index list (e.g., partial or complete PRACH index), BWP, serving cell, or frequency band. This information can be provided to the UE via RRC signaling or MAC CE.

[0053] The unified UL TCI state can be used to determine the spatial domain parameters of UL transmissions for UL-only TRPs. The unified TCI state can be extended to macro TRPs with downlink and / or SSB. That is, the unified UL TCI state can also be used to determine the spatial domain parameters of UL transmissions for macro TRPs. The unified TCI state can be used alternatively or additionally to replace SSB or other downlink information to determine the spatial domain parameters of UL transmissions to macro TRPs. Although downlink information or SSBs may exist for macro TRPs, the unified TCI state can be used to determine the spatial domain parameters of UL transmissions for macro TRPs instead of using DL RS or SSBs. Considering that the unified TCI state can be applied to transmissions of at least one of PDCCH, PDSCH, CSI-RS, PUCCH, PUSCH, or SRS, and can be applied to UL transmissions of PRACH for UL-only TRPs, the unified TCI state can be used to determine the spatial domain parameters of UL transmissions of PRACH for macro TRPs. This can provide a unified solution for the PRACH process of macro TRPs and micro TRPs, thereby simplifying the implementation of base stations and / or UEs.

[0054] Example 8 In a traditional RACH process, the SSB index, preamble index, and / or RO are determined. For UL TRP only, the SSB index can be determined to determine the RO index and preamble index, but the spatial domain parameters of the UL transmission can be determined based on a given reference signal, not the determined SSB index. If a given reference signal is determined for the UL transmission, it should be specified that the given reference signal is used to determine the spatial domain parameters of the UL transmission.

[0055] For example, refer to Figure 4 The association between SSB and RO can be configured for the UE. In some embodiments, there is also an association between SSB and preamble. Certain SSBs (e.g., SSB 1) can be configured for UL TRP only. If SSB 1 is determined for the PRACH procedure, a given reference signal is needed to determine the spatial domain parameters of the UL transmission (e.g., MSG1, MSG3, and / or MSGA). The given reference signal can be indicated along with the SSB or RO. The given reference signal can also be determined based on the unified TCI state.

[0056] It should be noted that the association between SSB and RO is one-to-one, many-to-one, or many-to-many, such as K to 1, 1 to 1, or 1 to M, where K or M is an integer greater than 1.

[0057] Note: RO can also be PO (PUSCH timing in MSGA).

[0058] Example 2 This embodiment involves using TCI states to indicate a given reference signal used to determine spatial relationship information.

[0059] In some embodiments, TCI states in the TCI state set are indicated to correspond to a reference signal. If the reference signal is determined by TCI states, a greater number of TCI states, in addition to the indicated TCI states, can be used to provide flexibility in determining the spatial domain parameters for UL transmissions in the RACH process.

[0060] In some embodiments, a specific TCI state can be indicated to the UE from an activated TCI state set (e.g., activated by MAC CE) or from a configured TCI state set indicated by MAC CE or RRC signaling.

[0061] In some embodiments, the TCI status can be indicated to the UE via a PDCCH command. In some embodiments, entries / code points in a TCI status set (e.g., an activated TCI status set) can be indicated via a PDCCH command that initiates a RACH procedure.

[0062] In some embodiments, the UE can determine the TCI state based on the association between the PRACH index and entries / code points in the TCI state set. Alternatively or additionally, the TCI state can be indicated to the UE via the association between the PRACH index and entries / code points in the TCI state set. The TCI state set can be an active TCI state set. In some embodiments, this association can be provided to the UE via RRC signaling or MAC CE. The entries / code points in the TCI state set include at least one of the following: the indicated TCI state for both DL and UL transmission, or the UL TCI state. When more than one TCI state is indicated, each TCI state corresponds to a TRP, such as a macro TRP or micro TRP.

[0063] In some embodiments, entries / code points in the TCI state set correspond to TRPs. In some embodiments, the first or second TCI state is determined by an indication or based on a TRP relationship.

[0064] Example 3 This embodiment relates to a probe reference signal (SRS) resource indicator used to determine spatial relationship information.

[0065] In some embodiments, SRS resources in an SRS resource set indicate a given reference signal used to determine spatial relation information. In some embodiments, SRS resources can be indicated from the same codebook or non-codebook SRS resource set used for PUSCH. In some embodiments, for NCB, only one SRS resource is indicated, and the indicated SRS resource is used to determine the reference signal used to determine spatial relation information. The codebook SRS resource set and the non-codebook SRS resource set refer to the SRS resource set using "codebook" and the SRS resource set using "non-codebook," respectively.

[0066] In some embodiments, SRS resources can be indicated from an SRS resource set used for beam management. In some embodiments, SRS resources can be indicated from an SRS resource set based on an SRS resource set ID configured by RRC.

[0067] In some embodiments, an SRS resource set can be indicated from a configured SRS resource set by MAC CE or RRC signaling. SRS resources can be indicated to the UE from the SRS resource set via PDCCH commands, RRC signaling, or MAC CE. SRS resources can also be indicated to the UE via the SRS resource set ID and the SRS resource index within the SRS resource set.

[0068] Figure 6 An example of a wireless communication system 600 to which one or more embodiments of the present technology may be applied is shown. The wireless communication system 600 may include one or more base stations (BSs) 605a, 605b, one or more wireless devices (or UEs) 610a, 610b, 610c, 610d, and a core network 625. Base stations 605a, 605b may provide wireless services to UEs 610a, 610b, 610c, and 610d in one or more wireless sectors. In some implementations, base stations 605a, 605b include directional antennas to generate two or more directional beams to provide wireless coverage in different sectors. The core network 625 may communicate with one or more base stations 605a, 605b. The core network 625 provides connectivity to other wireless communication systems and wired communication systems. The core network may include one or more service subscription databases to store information related to subscribed UEs 610a, 610b, 610c, and 610d. The first base station 605a can provide wireless services based on a first wireless access technology, while the second base station 605b can provide wireless services based on a second wireless access technology. Base stations 605a and 605b can be co-located or installed separately in the field depending on the deployment scenario. User equipment 610a, 610b, 610c, and 610d can support multiple different wireless access technologies. The technologies and embodiments described in this document can be implemented by the base stations or wireless devices described in this document.

[0069] Figure 7 This is a block diagram representation of a portion of a radio station to which one or more embodiments of the present invention may be applied. Radio station 705 (e.g., a network node, base station, or wireless device (or user equipment, UE)) may include processor electronics 710 (e.g., a microprocessor implementing one or more wireless technologies as presented herein). Radio station 705 may include transceiver electronics 715 for transmitting and / or receiving wireless signals via one or more communication interfaces (e.g., antenna 720). Radio station 705 may include other communication interfaces for transmitting and receiving data. Radio station 705 may include one or more memories (not explicitly shown) configured to store information (e.g., data and / or instructions). In some implementations, processor electronics 710 may include at least a portion of transceiver electronics 715. In some embodiments, at least some of the disclosed technologies, modules, or functions are implemented using radio station 705. In some embodiments, radio station 705 may be configured to perform the methods described herein.

[0070] The disclosed and other embodiments, modules, and functional operations described herein can be implemented in digital electronic circuits, or in computer software, firmware, or hardware, including the structures disclosed herein and their structural equivalents, or in combinations thereof. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more computer program instruction modules encoded on a computer-readable medium, executed by a data processing apparatus or used to control the operation of a data processing apparatus. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a storage device, a composition of substances affecting machine-readable propagation signals, or a combination thereof. The term "data processing apparatus" encompasses all means, devices, and machines for processing data, including, for example, a programmable processor, a computer, or multiple processors or computers. In addition to hardware, the apparatus may include code that creates an execution environment for the associated computer program, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or a combination thereof. Propagation signals are artificially generated signals, such as machine-generated electrical, optical, or electromagnetic signals, which are generated to encode information for transmission to an appropriate receiver device.

[0071] Computer programs (also known as programs, software, software applications, scripts, or code) can be written in any programming language, including compiled or interpreted languages, and can be deployed in any form, including as standalone programs or as modules, components, subroutines, or other units suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored as part of a file that holds other programs or data (e.g., one or more scripts stored in a markup language file), as a single file dedicated to that program, or as multiple coordinating files (e.g., a file storing one or more modules, subroutines, or code sections). Computer programs can be deployed to execute on a single computer or on multiple computers located at one site or distributed across multiple sites and interconnected by a communication network.

[0072] The processes and logic flows described in this document can be executed by one or more programmable processors executing one or more computer programs, performing functions by manipulating input data and generating outputs. The processes and logic flows can also be executed by special-purpose logic circuits (e.g., FPGAs (Field-Programmable Gate Arrays) or ASICs (Application-Specific Integrated Circuits)), and the devices can also be implemented as special-purpose logic circuits. Processors suitable for executing computer programs include, for example, general-purpose and special-purpose microprocessors, and any one or more processors of any kind of digital computer. Typically, the processor receives instructions and data from read-only memory or random access memory, or both. The basic elements of a computer are a processor for executing instructions and one or more storage devices for storing instructions and data. Typically, a computer will also include, or be operatively coupled to, receiving data from or transferring data to one or more mass storage devices (e.g., disks, magneto-optical disks, or optical disks), or both. However, a computer does not need to have such devices. Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and storage devices, including, for example, semiconductor storage devices (e.g., EPROM, EEPROM, and flash memory devices); magnetic disks (e.g., internal hard disks or removable disks); magneto-optical disks; and CD-ROMs and DVD-ROMs. Processors and memory may be supplemented by or integrated into dedicated logic circuitry.

[0073] While this patent document contains numerous specific details, these should not be construed as limiting the scope of any invention or the content that may be claimed, but rather as descriptions of features that may be specific to particular embodiments of a particular invention. Certain features described in the context of individual embodiments in this patent document may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. Furthermore, while features may be described as functioning in certain combinations and even initially claimed as such combinations, in certain circumstances one or more features from the claimed combination may be removed from the claimed combination, and the claimed combination may be for sub-combinations or variations thereof.

[0074] Similarly, although operations are depicted in a specific order in the accompanying drawings, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential manner, or requiring all shown operations to achieve the desired result. Furthermore, the separation of various system components in the embodiments described in this patent document should not be construed as requiring such separation in all embodiments.

[0075] Only a few implementations and examples are described, and other implementations, enhancements and variations may be made based on what is described and shown in this patent document.

Claims

1. A wireless communication method, comprising: The terminal device determines spatial domain parameters based on information about the reference signal from the first base station; as well as The terminal device performs transmission to the second base station according to the spatial domain parameters.

2. A wireless communication method, comprising: The first base station sends information about the reference signal to the terminal device so that the terminal device can determine the spatial domain parameters for transmission to the second base station.

3. The method according to claim 1 or 2, wherein the spatial domain parameters include at least one of spatial relation, spatial filter, beam parameters, antenna parameters, antenna group parameters, panel parameters, panel group parameters, or quasi-co-located QCL parameters.

4. The method according to any one of claims 1 to 3, wherein the transmission to the second base station includes transmissions during the random access process.

5. The method according to any one of claims 1 to 4, wherein the information regarding the reference signal is indicated by RRC signaling from the first base station.

6. The method according to any one of claims 1 to 5, wherein the information about the reference signal includes at least one of the following: information about the probe reference signal SRS resource, or information about the transmission configuration indicator TCI status.

7. The method of claim 6, wherein the information regarding the SRS resources is based on at least one of the following: a codebook CB SRS resource set, a non-codebook NCB SRS resource set, a beam-managed SRS resource set, or an SRS resource set configured by the first base station.

8. The method of claim 7, wherein information about the SRS resource is determined based on an index of the SRS resource in the SRS resource set.

9. The method according to any one of claims 1 to 8, wherein the information about the reference signal is indicated by information associated with the random access procedure.

10. The method of claim 9, wherein the random access procedure is initiated by a Physical Downlink Control Channel (PDCCH) command, and wherein the information about the reference signal is carried in DCI signaling.

11. The method of claim 10, wherein the field in the DCI signaling configured as a synchronization signal and a physical broadcast channel block (SSB) index is interpreted as indicating information about the reference signal.

12. The method according to any one of claims 4 to 11, wherein the information about the reference signal is determined based on an index associated with the random access procedure.

13. The method of claim 12, wherein the index associated with the random access procedure includes at least one of the following: a contention-free random access procedure CFRA timing identifier ID, a random access channel timing ID, a CFRA resource ID, a physical random access channel PRACH configuration ID, a synchronization signal and physical broadcast channel block SSB ID, or a preamble ID.

14. The method of claim 12 or 13, wherein the information about the reference signal is associated with an index related to the random access procedure.

15. The method according to any one of claims 4 to 14, wherein the information about the reference signal is determined based on the indicated TCI state.

16. The method of claim 15, wherein the index associated with the random access procedure is associated with information indicating whether the indicated TCI state is suitable for determining the information about the reference signal.

17. The method of claim 15 or 16, wherein the PDCCH command initiating the random access procedure includes information indicating whether the indicated TCI state is suitable for determining the information about the reference signal.

18. The method according to any one of claims 15 to 17, wherein information indicating whether the indicated TCI state is suitable for determining the information about the reference signal is provided to the terminal device for at least one of a PRACH index list, a bandwidth portion (BWP), a serving cell, or a frequency band.

19. The method according to any one of claims 15 to 18, wherein the indicated TCI state is used to determine spatial domain parameters of the transmission to the first base station, wherein the transmission to the first base station includes transmissions during a random access procedure.

20. The method according to any one of claims 15 to 19, wherein the indicated TCI state includes a TCI state used only for uplink transmission or a TCI state used for both uplink and downlink transmission.

21. The method according to any one of claims 1 to 20, wherein the information about the reference signal is determined based on the TCI state.

22. The method of claim 21, wherein the TCI state includes at least one of the following: an uplink TCI state, or a TCI state for both uplink and downlink transmission.

23. The method according to claim 21 or 22, wherein the TCI state is selected from the TCI state set based on Radio Resource Control (RRC) signaling, Media Access Control (MAC) control elements, or Downlink Control Information (DCI) signaling.

24. The method of claim 23, wherein the TCI state set is an activated TCI state set activated by MAC CE.

25. The method according to any one of claims 21 to 23, wherein the TCI status is indicated by a PDCCH command.

26. The method of any one of claims 19 to 22, wherein the TCI state is determined based on the relationship between an index associated with the random access procedure and entries or code points in the TCI state set.

27. The method according to any one of claims 1 to 25, wherein the first base station is configured to perform both uplink and downlink transmissions, and wherein the second base station is configured to perform only uplink transmissions.

28. A communication device comprising at least one processor configured to implement the method of any one or more of claims 1 to 27.

29. A computer program product having code stored thereon, said code, when executed by at least one processor, causing said at least one processor to implement the method of any one or more of claims 1 to 27.

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