Reference signal resource signaling method and apparatus
By configuring DMRS sequences based on cell IDs and utilizing enhanced TCI states and MAC CE fields, the solution addresses the challenge of DMRS determination in super cell architectures, enhancing channel estimation and reducing interference in wireless networks.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2025-03-06
- Publication Date
- 2026-06-11
AI Technical Summary
The challenge of determining DMRS sequences and patterns in super cell or TRP cluster architectures within wireless networks, particularly for PBCH, PDSCH, and PDCCH, is not adequately addressed in existing wireless communication standards.
The proposed solution involves configuring DMRS sequences based on cell IDs, using physical and virtual cell IDs, and employing enhanced TCI states and MAC CE fields to indicate sequence root IDs, ensuring orthogonal mapping and transmission across multiple TRPs.
This approach enables efficient demodulation of reference signals in super cell architectures by ensuring orthogonal DMRS patterns, improving channel estimation and reducing interference among virtual cells and TRPs.
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Figure CN2025080938_11062026_PF_FP_ABST
Abstract
Description
REFERENCE SIGNAL RESOURCE SIGNALING METHOD AND APPARATUSTECHNICAL FIELD
[0001] The present document relates to wireless communication and, in particular, to reference signal transmissions in wireless networks.BACKGROUND
[0002] Mobile telecommunication technologies are moving the world toward an increasingly connected and networked society. In comparison with the existing wireless networks, next generation systems and wireless communication techniques will need to support a much wider range of use-case characteristics and provide a more complex and sophisticated range of access requirements and flexibilities.
[0003] Long-Term Evolution (LTE) is a standard for wireless communication for mobile devices and data terminals developed by 3rd Generation Partnership Project (3GPP) . LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The 5th generation of wireless system, known as 5G, advances the LTE and LTE-Awireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs.SUMMARY
[0004] Techniques described in the present document may be used for improvements to the transmission and reception of reference signals in wireless networks.
[0005] In one example aspect, a method of wireless communication is disclosed. The method includes receiving, by a wireless device from a network device, a message indicating reference signal (RS) information; and performing by the wireless device, using the reference signal information, a reception an RS transmission.
[0006] In another example aspect, a method of wireless communication is disclosed. The method includes transmitting, by a network device to a wireless device, a message indicating reference signal (RS) information; and performing by the network device, an RS transmission according to the reference signal (RS) information.
[0007] In yet another example aspect, a device for wireless communication is disclosed. The device includes one or more processors configured to execute program code that causes the device to implement an above-described method.
[0008] In yet another aspect, a storage medium is disclosed. The storage medium is computer-readable and stores code that, upon execution, causes one or more processors to control operations of a device to implement an above-described method.
[0009] These, and other, aspects are further described throughout the present document.BRIEF DESCRIPTION OF DRAWINGS
[0010] FIG. 1 shows an example of a wireless network topology.
[0011] FIG. 2 shows an example wireless network.
[0012] FIG. 3 is a block diagram representation of a portion of a hardware platform in accordance with one or more embodiments of the present technology can be applied.
[0013] FIGS. 4A-4B are flowcharts for wireless communication method embodiments.
[0014] FIG. 5 shows an example of a Medium Access Control (MAC) Control Element (CE) .
[0015] FIG. 6 shows another example of a Medium Access Control (MAC) Control Element (CE) .DETAILED DESCRIPTION
[0016] Techniques described in the present document may be used for achieving improvements to the operation of reference signal (RS) resource signaling in a wireless network. In particular, demodulation reference signal (DMRS) is used as an example RS, but similar techniques may be applied to other RS such as cell specific reference signals or sounding reference signals.
[0017] Section headings are used in the present document only to improve readability and do not limit scope of the disclosed embodiments and techniques in each section to only that section. Furthermore, some embodiments are described with reference to Third Generation Partnership Project (3GPP) Fifth Generation (5G) New Radio (NR) or Sixth Generation (6G) standard for ease of understanding and the described technology may be implemented in different wireless system that implement protocols other than the NR or 6G protocol.
[0018] The following acronyms are used in the present document.
[0019] 1. Initial discussion
[0020] In wireless networks, reference signal transmissions are used to allow a better understanding of the transmission environment between a transmitter and a receiver. In the prevailing wireless system standards, several reference signals are used, with transmission characteristics of each reference signal being tailored to the intended use of the reference signal (e.g., for understanding and correcting phase, power, narrow band frequency response, wideband frequency response etc. ) . Demodulation reference signal (DMRS) is one example of reference signal that may be included within the time / frequency resources designated for a particular physical channel. DMRS may typically be used for estimation of the transmission channel and separate DMRS signal may be included with separate physical channels such as the PBCH, PDSCH and PDCCH.
[0021] One example implementation of DMRS that is communicated between a user equipment (UE) and a network side device such as a base station or a TRP (transmission reception point) is disclosed below as an example.
[0022] The UE assumes the reference-signal sequence r (m) for an SS / PBCH block is defined by
[0023] The scrambling sequence generator is initialized at the start of each SS / PBCH block occasion with
[0024] where
[0025] -for where nhf is the number of the half-frame in which the PBCH is transmitted in a frame with nhf=0 for the first half-frame in the frame and nhf=1 for the second half-frame in the frame, and iSSB is the two least significant bits of the candidate SS / PBCH block index.
[0026] -for where iSSB is the three least significant bits of the candidate SS / PBCH block index with being the maximum number of candidate SS / PBCH blocks in a half frame.
[0027] The UE assumes the sequence of complex-valued symbols dPBCH (0) , …, dPBCH(Msymb-1) constituting the physical broadcast channel to be scaled by a factor β`PBCH to conform to the PBCH power allocation and mapped in sequence starting with dPBCH (0) to resource elements (k, l) p, μ which meet all the following criteria:
[0028] -they are not used for PBCH demodulation reference signals.
[0029] The mapping to resource elements (k, l) p, μ not reserved for PBCH DM-RS is in increasing order of first the index k and then the index l, where k and l represent the frequency and time indices, respectively, within one SS / PBCH block and are given by Table 1.
[0030] The UE assumes the sequence of complex-valued symbols r (0) , ..., r (143) constituting the demodulation reference signals for the SS / PBCH block to be scaled by a factor of to conform to the PBCH power allocation specified in 3GPP document TS 38.213 and to be mapped to resource elements (k, l) p, μ in increasing order of first k and then l where k and l are given by Table 1 and represent the frequency and time indices, respectively, within one SS / PBCH block. The quantity v in Table 1 is given by mod 4.
[0031] Table 1: Resources within an SS / PBCH block for PSS, SSS, PBCH, and DM-RS for PBCH.
[0032] One of the technical problems addressed and solved by the techniques disclosed in the present document includes how to handle super cell architecture and reference signal transmissions. For example, in the downlink transmission, for PBCH (physical broadcast channel) PDCCH or PDSCH, if a super cell or a TRP cluster is used, one super cell or TRP cluster contains a plurality of virtual cells or TRPs. For DMRS in PBCH, the cell ID is used for the sequence generation. If super cell or virtual cell or TRP cluster is introduced, how to determine the DMRS sequence or the DMRS pattern in a super cell or TRP cluster is not known.
[0033] Various example embodiments are provided to highlight certain features using specific examples of DMRS for PBCH (embodiment examples 1) , PDSCH (embodiment examples 2) , and PDCCH (embodiment examples 3) . However, the techniques described in one section may be combine or may replace the techniques described in another section.
[0034] 2. Embodiment Examples 1
[0035] In some implementations, UE receives a message from gNB, the message indicates a DMRS information, UE demodulate the DMRS based on the indicated DMRS information.
[0036] As shown in FIG. 1, two super cells are configured, and each super cell is configured with a plurality of virtual cells. Super cell 1 is depicted to include four virtual cells while Super cell is depicted to include 5 virtual cells. A network device such as a base station comprising one or more antennal panels or TRPs is depicted in the center of each virtual cell, with elliptical beams shown to provide coverage to a wireless device (shown as a gray circle) that may move around within the cells, as indicated by the arrows.
[0037] The cell ID is associated with the indicated DMRS information, can be a super cell ID, where the super cell ID is indicated as a physical cell ID, configured for a super cell. In some embodiments, the virtual cell can be indicated with a virtual cell ID or ID for one TRP.
[0038] Once the DMRS is configured for the PBCH, UE receives the configuration and demodulates the related DMRS.
[0039] The DMRS in each cell is associated with the cell ID for the determination of scrambling sequence. Different cell ID indicate different cell, UE can demodulate the related PBCH based on the DMRS with the configured scrambling sequence.
[0040] When super cell or virtual cell is configured, the related DMRS sequence is determined based on the configured cell ID.
[0041] The cell ID related to the DMRS is configured as physical cell ID. The physical ID is shared by a plurality of virtual cell or TRPs. And the physical ID is configured for one super cell. All the UEs in the super cell receives the configured DMRS associated with the same cell ID. DMRS in different super cell is associated with different cell IDs and maybe mapped on different frequency resource elements or with different sequence on the same frequency resource element. The frequency resource elements can be subcarriers, resource blocks, physical resource blocks, or groups of physical resource blocks.
[0042] The cell ID related to the virtual cell, and is configured with as virtual cell ID. Different DMRS in the super cell with different virtual cell ID is mapped with different frequency resource elements, such as subcarriers.
[0043] In some cases, the number of virtual cell in one super cell should be restricted. Such as, if no more than 4 virtual cells are configured, the DMRS with different virtual cell IDs are mapped on different subcarriers.
[0044] In some implementations, if more than 4 virtual cells are configured in one super cell, e.g. super cell-2 in FIG. 1, maybe two virtual cells are configured with the same sequence or mapped on the same frequency resource elements. But some configuration restriction are needed, e.g., two cells with the same sequence or mapped on the same frequency resource elements should be restricted as non-adjacent cells. Or it should be restricted that the adjacent virtual cells should not be configured with the same mod 4, where is the configured cell ID, here means virtual cell ID, the virtual cells in different super cell can be configured with:
[0045] [1] The same virtual cell ID. With the same virtual cell ID, the DMRS in different super cell may not be orthogonal, or
[0046] [2] different virtual cell ID. With different virtual IDs, the DMRS is the virtual cells in different super cells are also orthogonal with different frequency resources or different scrambling sequence.
[0047] In some implementations, if more than 4 virtual cells are configured in one super cell, and the DMRS is associated with the virtual cell ID, then the sequence or the mapped frequency resources should be determined according to mod A, where A is a predefined value or a configured value, or A can be configured according to the number of virtual cells in one super cell. For example, A is predefined or configured as value 6, then the generated sequence for the DMRS is associated with a scrambling sequence () and the mapping resources in the frequency domain is determined as shown in table 1-1.
[0048] Table 1-1: Resources within an SS / PBCH block for DM-RS for PBCH.
[0049] In some implementations, the cell ID related to the super cell and the virtual cell, the super cell is associated with a physical cell ID, and the virtual cells in the super cell is configured with a further virtual cell ID or a different orthogonal code. The cell ID is a combination of super cell and virtual cell, e.g.
[0050] In the above cases, the super cell can also be defined as a TRP cluster, and one virtual cell in one super cell is one TRP in one TRP cluster.
[0051] 3. Embodiment Examples 2
[0052] Embodiments disclosed in this section relate to multi-level signaling of RS resources, specifically for PDSCH.
[0053] For the DMRS of PDSCH, a plurality of groups of DMRS ports are configured or indicated from gNB to UE. For the DMRS configuration and indication, one root sequence ID should be informed to UE.
[0054] If the IDs related to the DMRS sequence mod 231 is not configured, the In such case, the determination of introduced above can also be used for the sequence determination of PDSCH DMRS.
[0055] If a plurality of IDs can be configured to UE, e.g. one ID is associated with one virtual cell or TRP, when UE receives the configured DMRS, then UE will know the related ID, and the relate root sequence.
[0056] In some implementations, first the number of IDs is determined. Considering different numbers of virtual cells in one super cell are supported, then the number of IDs can be configured as a fixed valued or a configurable number of values.
[0057] If two IDs are configured, or a plurality of IDs are configured and only 2 IDs are activated by MAC CE, then the related ID can be indicated in DCI field. For example, 1-bit in DCI is used to indicate which ID is the indicated DMRS ports are associated with. Or a field in DCI is used to indicate the related sequence-root ID, e.g. TCI field. In such case, TCI state or TCI state group can be associated with the related sequence-root ID.
[0058] 1) In some implementations, when UE is indicated with one TCI state or state group, the sequence-root ID is also indicated with the TCI state.
[0059] For example, when TCI state is configured, a sequence root ID is configured in the TCI state configuration, e.g. different TCI state ID for different virtual cells or super cells with different sequence root IDs, or the same TCI state ID with for different virtual cells or super cells but configured with one more sequence root ID. When the configured TCI state is indicated to UE, UE will get the sequence root ID.
[0060] Or when more than one TCI states is indicated to UE, the order of TCI states in the TCI state group indicates different sequence root ID.
[0061] 2) In some implementations, more than one DCI fields are used to indicate the sequence root ID. For example, one TCI field is used to indicate a subset of sequence root ID, such as RRC (radio resource control) configured a set of sequence root IDs and different TCI states are associated with different subsets of the configured sequence root ID. Then anther DCI field, e.g. 1-bit is used to indicate which one in the indicated subset of the sequence root ID
[0062] For CJT-mTRP or SFN PDSCH, DMRS sequence ID is ‘TRP-specific (TRP-combination) ’ , i.e. the same DMRS are transmitted from different TRPs. Here, additional indication on DCI field may be provided, e.g., one of N ID (s) . For example, when a plurality of TRPs or sequence root IDs are configured, which one or more sequence root IDs are used for DMRS may be indicated. For example, when one DMRS ports is indicated to UE, and 2 or more sequence root ID is configured, and DCI signaling , e.g. one or more new or reserved bits can be used to indicate one sequence root ID from the configured IDs.
[0063] The consideration of using reserved bits in the TCI states activation in MAC CE is as follows. For example, the enhanced TCI states activation or deactivation is indicated as shown in FIG. 5, where the ‘R’ field is the reserved bit, one or more bits is indicated in the ‘R’ field, and can be used for the sequence root IDs indication. Here, “oct” represents octet of bits.
[0064] FIG. 5 shows an example of a MAC CE that may signal enhanced TCI states activation / deactivation for UE-specific PDSCH.
[0065] 4. Embodiment Examples 3
[0066] The embodiments disclosed in this section illustrate reference signals for PDCCH.
[0067] For the DMRS of PDCCH, a DMRS port is configured or indicated from gNB to UE. For the DMRS configuration and indication, one root sequence ID should be informed to UE.
[0068] In current 3GPP standards, The pseudo-random sequence generator is initialized with:
[0069] The parameter NID is configured associated with one sequence root ID, or associated with the cell ID. In such case, the determination of introduced above can also be used for the sequence determination of PDCCH DMRS.
[0070] When the sequence root ID is configured, at least one TCI state is activated for the at least one Coreset. Similar to sequence root ID determination for PDSCH introduce above, the TCI states associated with the sequence root ID.
[0071] For example, when TCI state is configured, a sequence root ID is configured in the TCI state configuration, e.g. different TCI state ID for different virtual cells or super cells with different sequence root IDs, or the same TCI state ID for different virtual cells or super cells but configured with one more sequence root ID. When the configured TCI state is indicated to UE, UE will get the sequence root ID.
[0072] In some embodiments, when more than one TCI states is indicated to UE, the order of TCI states in the TCI state group indicates different sequence root ID.
[0073] In some embodiments, one MAC CE field may be used to indicate a subset of sequence root ID. For example, an RRC message may configure a set of sequence root IDs and different TCI states may be associated with different subsets of the configured sequence root ID. Then anther MAC CE field or reserved bits, may be used to indicate which one in the indicated subset of the sequence root ID
[0074] For CJT-mTRP or SFN PDCCH, DMRS sequence ID is ‘TRP-specific (TRP-combination) ’ , i.e. the same DMRS are transmitted from different TRPs. Additional indication on MAC CE field may be used, e.g., one of N ID (s) . For example, when a plurality of TRPs or sequence root IDs are configured, which one or more sequence root IDs are used for DMRS should be indicated. For example, when one DMRS ports is indicated to UE, and 2 or more sequence root ID is configured, and MAC CE signaling, e.g. one or more new or reserved bits can be used to indicate one sequence root ID from the configured IDs.
[0075] Similar to PDSCH, the consideration of using reserved bits in the TCI states activation in MAC CE for PDCCH, the enhanced TCI states activation or deactivation is indicated as depicted in FIG. 6, where the ‘R’ field is the reserved bit, one or more bits is indicated in the ‘R’ field, and can be used for the sequence root IDs indication.
[0076] FIG. 6 shows an example of a MAC CE providing enhanced TCI States Indication for UE-specific PDCCH.
[0077] 5. Conclusion
[0078] It will be appreciated by those of skill in the art that the present document discloses techniques that can be adopted by transmitting and receiving devise in a wireless system to perform an improved use of reference signal resources for reference signal transmission, particularly when a super cell or a virtual cell architecture is used in the wireless system. In particular, for DMRS implementations, UE receives a message from gNB, the message indicates a DMRS information, UE demodulate the DMRS based on the indicated DMRS information. The reference signal may be configured to allow calibration measurement of a particular physical channel such as a PBCH, PDCCH or PDSCH.
[0079] It will further be appreciated that the present document discloses several embodiments that allow for better reference signal use for PBCH. For example, when a super cell or a virtual cell is configured, the related DMRS sequence is determined based on the configured cell ID. Further example techniques include:
[0080] ● The cell ID related to the DMRS is configured as physical cell ID. The physical ID is shared by a plurality of virtual cell or TRPs. And the physical ID is configured for one super cell.
[0081] ● The cell ID related to the virtual cell, and is configured with as virtual cell ID. Different DMRS in the super cell with different virtual cell ID is mapped with different frequency resource elements, such as subcarriers.
[0082] ● The virtual cells in different super cell can be configured with:
[0083] a) The same virtual cell ID. At least one virtual cells in different super cells is configured with the same cell ID, or can be defined as overlapped IDs. For example, super cell 1 and super cell 2 is configured with the same virtual cell ID 0, 1, 2, 3, that means fully overlapped IDs. But if super cell 1 and super cell 2 is configured with virtual cell ID 0, 1, 2, 3 and ID 0, 1, 2, 4, that means partially overlapped.
[0084] i.In this case, it should be restricted that the virtual cells with the same IDs should not be adjacent or configured in one super cell
[0085] ii. Or the virtual cell IDs should be configured with super cell IDs. UEs can distinguish the virtual cells in different super cells.
[0086] b) Different virtual cell ID. With different virtual IDs, UE can distinguish the virtual cells just with the virtual cell IDs. For example, super cell 1 and super cell 2 is configured with virtual cell ID 0, 1, 2, 3 and ID 4, 5, 6, 7, if a virtual cell ID is configured to UE, UE can modulate or map the related DMRS based on the configured virtual cell ID. Further, UE will also know the associated super cell ID.
[0087] ● If more than 4 virtual cells are configured in one super cell, and the DMRS is associated with the virtual cell ID, then the sequence or the mapped frequency resources should be determined according to mod A, where A is a predefined value or a configured value, or A can be configured according to the number of virtual cells in one super cell.
[0088] ● The cell ID related to the super cell and the virtual cell, the super cell is associated with a physical cell ID, and the virtual cell (s) in the super cell is configured with a further virtual cell ID or a different orthogonal code.
[0089] It will further be appreciated that the present document discloses several embodiments that allow for better use of reference signals for PDSCH or PDCCH. Some of the disclosed aspects include:
[0090] (a) Use of DCI / MAC CE field (1-bit) or a TCI state to indicate sequence-root ID for DMRS.
[0091] (b) TCI state (group) is joint coded with ‘sequence-root ID’ .
[0092] (b1) the relationship between ‘the DCI or MAC CE field (1-bit) ’a nd ‘the indicated TCI state’ .
[0093] (b2) For instance, an indicated TCI state is to provide a subset of sequence root (s) , and ‘the DCI or MAC CE field (1-bit) ’ is to further down-select one of the subset.
[0094] (c) For CJT-mTRP, DMRS sequence ID is ‘TRP-specific (TRP-combination) , and additional enhancement on DCI or MAC CE field (>1 bit) is needed (one of N ID (s) ) .
[0095] 6. Implementation Embodiments
[0096] FIG. 2 shows an example of a wireless communication system 1300 where techniques in accordance with one or more embodiments of the present technology can be applied. A wireless communication system 1300 can include one or more base stations (BSs) 1305a, 1305b, one or more wireless devices (or UEs) 1310a, 1310b, 1310c, 1310d, and a core network 1325. A base station 1305a, 1305b can provide wireless service to terminal devices 1310a, 1310b, 1310c and 1310d in one or more wireless sectors. In some implementations, a base station 1305a, 1305b includes directional antennas to produce two or more directional beams to provide wireless coverage in different sectors. The core network 1325 can communicate with one or more base stations 1305a, 1305b. The core network 1325 provides connectivity with other wireless communication systems and wired communication systems. The core network may include one or more service subscription databases to store information related to the subscribed terminal devices 1310a, 1310b, 1310c, and 1310d. A first base station 1305a can provide wireless service based on a first radio access technology, whereas a second base station 1305b can provide wireless service based on a second radio access technology. The base stations 1305a and 1305b may be co-located or may be separately installed in the field according to the deployment scenario. The terminal devices 1310a, 1310b, 1310c, and 1310d can support multiple different radio access technologies. The techniques and embodiments described in the present document may be implemented by the base stations (network devices) or wireless devices described in the present document.
[0097] FIG. 3 is a block diagram representation of a portion of a hardware platform in accordance with one or more embodiments of the present technology can be applied. The hardware platform 1405 may implement functionalities of a device or an apparatus such as a BS (anetwork device) or a wireless device (e.g., a UE) can include processor electronics 1410 such as one or more microprocessors, processors, system on chip (SOC) or the like that implements one or more of the wireless communication techniques presented in this document. The hardware platform 1405 can include transceiver electronics 1415 to send and / or receive messages and signals over one or more communication interfaces such as antenna 1420. In some embodiments, the communication interface may be a wired interface, in which case the antenna 1420 may not be needed / used. The hardware platform 1405 can include other communication interfaces for transmitting and receiving data (e.g., data transmissions among entities in a core network) . The hardware platform 1405 can include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some implementations, the processor electronics 1410 can include at least a portion of the transceiver electronics 1415. In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the hardware platform 1405. In some embodiments, the hardware platform 1405 may be configured to perform the methods described herein. For example, the processor electronics 1410 may control the transceiver electronics 1415 to transmit or receive signals disclosed herein and thereby control the hardware platform to perform methods described herein.
[0098] 7. Example technical solutions
[0099] Some preferred embodiments may implement the following solutions.
[0100] 1. A method of digital communications (e.g., method 410 depicted in FIG. 4A) , comprising: receiving (412) , by a wireless device from a network device, a message indicating reference signal information; and performing (414) by the wireless device, using the reference signal information, a reception an RS transmission.
[0101] 2. A method of digital communications (e.g., method 420 depicted in FIG. 4B) , comprising: transmitting (422) , by a network device to a wireless device, a message indicating reference signal (RS) information; and performing (424) by the network device, an RS transmission according to the reference signal (RS) information.
[0102] 3. The method of any of above solutions, wherein the RS information includes a cell identifier that is used for demodulating the RS transmission.
[0103] 4. The method of solution 3, wherein the cell identifier is a super cell identifier or a virtual cell identifier.
[0104] 5. The method of any of solutions 3-4, wherein the cell identifier is a physical cell identifier.
[0105] 6. The method of any of solutions 4-5, wherein the cell identifier related to the DMRS is configured as physical cell identifier for one super cell , and the physical identifier is shared by a plurality of virtual cell or TRPs.
[0106] 7. The method of any of solution 4-6, wherein the cell identifier is associated with the virtual cell identifier , where the virtual cell identifiers in different super cells are at least one of: non-overlapped, partial or full overlapped.
[0107] 8. The method of any of solution 1, wherein the and the DMRS sequence or the mapped frequency resources are associated with mod A, where A is a predefined value or a configured value larger than 4 or A can be configured according to the number of virtual cells in one super cell, and the is the cell identifier of the virtual cell in one super cell.
[0108] 9. The method of any of solution 4-8, where the cell identifier related to a super cell identifier and a virtual cell identifier, the super cell identifier is associated with a physical cell identifier, and the virtual cell (s) in the super cell is configured with a further virtual cell ID or an orthogonal code.
[0109] 10. The method of any of solutions 4-9, wherein the wireless device and the network device operate in a super cell comprising V number of virtual cells, where V is a positive integer, and wherein: [1] in a case that V is less than or equal to a threshold, the reference signal information maps reference signals of each virtual cell in the super cell to a different subcarrier; or [2] in a case that V is greater than the threshold, the reference signal is mapped to same subcarriers in non-adjacent cells.
[0110] 11. The method of any of above solutions, wherein the RS transmission corresponds to a physical broadcast channel (PBCH) .
[0111] Some additional features of the above solutions are disclosed with reference to example embodiments 1.
[0112] 12. The method of solution 1, wherein the reference signal information indicates a sequence root identifier for the RS transmission, where in the sequence root identifier is associated with at least one of: a super cell identifier, a virtual cell identifier or a configured identifier.
[0113] 13. The method of solution 12, wherein the sequence root identifier is indicated by using at least one of (1) one or more activation bits and / or (2) one or more transmission reception indicator (TCI) states.
[0114] 14. The method of solution 12, wherein one or more reserved fields in the one or more TCI states is used to indicate the sequence root identifier.
[0115] 15. The method of solution 12, wherein the one or more TCI states are jointly encoded with the sequence root identifier.
[0116] 16. The method of any of solutions 12-15, wherein the one or more activation bits and the one or more TCI states jointly indicate the sequence root identifier.
[0117] 17. The method of solution 16, wherein the one or more TCI states indicate a group of the sequence root identifiers, and wherein the one or more activation bits indicates the sequence root identifier within the group of sequence root identifiers.
[0118] 18. The method of solutions 12-16, wherein the one or more activation bits are included in a medium access control control element (MAC CE) or a downlink control indicator (DCI) .
[0119] 19. The method of any of solutions 1-18, wherein the RS transmission comprises a demodulation reference signal (DMRS) .
[0120] Some additional features of the above solutions are disclosed with reference to example embodiments 2 and 3.
[0121] 20. A wireless communications apparatus, comprising: at least one processor; and
[0122] a transceiver communicatively coupled to the at least one processor, the transceiver being configured to transmit signals from, or received signals for, the wireless communication apparatus; and wherein the at least one processor is configured to cause the wireless communication apparatus the method of any of solutions 1 to 19.
[0123] 21. A computer-readable storage medium having code stored thereon, the code, upon execution by at least one processor, causing a device to implement the method of any of solutions 1 to 19.
[0124] The disclosed and other embodiments, modules and the functional operations described in this document can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or in combinations of one or more of them. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or to control the operation of, data processing apparatus. The computer readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter effecting a machine-readable propagated signal, or a combination of one or more of them. The term “data processing apparatus” encompasses all apparatus, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers. The apparatus can include, in addition to hardware, code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them. A propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, which is generated to encode information for transmission to suitable receiver apparatus.
[0125] A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit 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 in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document) , in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub programs, or portions of code) . A computer program can be deployed to be executed on one computer or on multiple computers that are located at one site or distributed across multiple sites and interconnected by a communication network.
[0126] The processes and logic flows described in this document can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can also be implemented as, special purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit) . Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read only memory or a random-access memory or both. The essential elements of a computer are a processor for performing instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include, or be operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto optical disks, or optical disks. However, a computer need not have such devices. Computer readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media and memory devices, including by way of example semiconductor memory devices, e.g., EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto optical disks; and CD ROM and DVD-ROM disks. The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.
[0127] While this patent document contains many specifics, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of particular inventions. Certain features that are described in this patent document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
[0128] Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Moreover, the separation of various system components in the embodiments described in this patent document should not be understood as requiring such separation in all embodiments.
[0129] Only a few implementations and embodiments are described, and other implementations, enhancements and variations can be made based on what is described and illustrated in this patent document.
Claims
1.A method of digital communications, comprising:receiving, by a wireless device from a network device, a message indicating reference signal information; andperforming by the wireless device, using the reference signal information, a reception an RS transmission.2.A method of digital communications, comprising:transmitting, by a network device to a wireless device, a message indicating reference signal (RS) information; andperforming by the network device, an RS transmission according to the reference signal (RS) information.3.The method of any of claims 1-2, wherein the RS information includes a cell identifier that is used for demodulating the RS transmission.4.The method of claim 3, wherein the cell identifier is a super cell identifier or a virtual cell identifier.5.The method of claim 4, wherein the cell identifier is a physical cell identifier.6.The method of claim 5, wherein the cell identifier related to the reference signal is configured as physical cell identifier for one super cell , and the physical identifier is shared by a plurality of virtual cell or transmission reception points (TRPs) .7.The method of claim 4, wherein the cell identifier is associated with the virtual cell identifier , where the virtual cell identifiers in different super cells are at least one of: non-overlapped, partial or fully overlapped.8.The method of claim 1 or 2, wherein a reference signal sequence or mapped frequency resources are associated with mod A, where A is a predefined value, or a configured value larger than 4, or A is configured according to a number of virtual cells in one super cell, and the is a cell identifier of the virtual cell in one super cell.9.The method of claim 3, where the cell identifier related to a super cell identifier and a virtual cell identifier, the super cell identifier is associated with a physical cell identifier, and the virtual cell in the super cell is configured with a further virtual cell ID or an orthogonal code.10.The method of claim 1 or 2, wherein the wireless device and the network device operate in a super cell comprising V number of virtual cells, where V is a positive integer, and wherein:[1] in a case that V is less than or equal to a threshold, the reference signal information maps reference signals of each virtual cell in the super cell to a different subcarrier; or[2] in a case that V is greater than the threshold, the reference signal is mapped to same subcarriers in non-adjacent cells.11.The method of claim 3, wherein the RS transmission corresponds to a physical broadcast channel (PBCH) .12.The method of claim 1 or 2, wherein the reference signal information indicates a sequence root identifier for the RS transmission, where in the sequence root identifier is associated with at least one of:a super cell identifier, a virtual cell identifier or a configured identifier.13.The method of claim 12, wherein the sequence root identifier is indicated by using at least one of (1) one or more activation bits and / or (2) one or more transmission configuration indication (TCI) states.14.The method of claim 13, wherein one or more reserved bits in the one or more TCI states is used to indicate the sequence root identifier.15.The method of claim 13, wherein the one or more TCI states are jointly encoded with the sequence root identifier.16.The method of claim 13, wherein one or more activation bits and the one or more TCI states jointly indicate the sequence root identifier.17.The method of claim 16, wherein the one or more TCI states indicate a group of the sequence root identifiers, and wherein the one or more activation bits indicates the sequence root identifier within the group of sequence root identifiers.18.The method of claims 12-16, wherein the one or more activation bits or reserved fields are included in a medium access control control element (MAC CE) or a downlink control indicator (DCI) .19.The method of claims 1 or 2, wherein the RS transmission comprises a demodulation reference signal (DMRS) .20.A wireless communications apparatus, comprising:at least one processor; anda transceiver communicatively coupled to the at least one processor, the transceiver being configured to transmit signals from, or received signals for, the wireless communication apparatus; andwherein the at least one processor is configured to cause the wireless communication apparatus the method of any of claims 1 to 19.21.A computer-readable storage medium having code stored thereon, the code, upon execution by at least one processor, causing a device to implement the method of any of claims 1 to 19.