WO2020258046A1 - Methods, devices and computer storage media for communication - Google Patents

Methods, devices and computer storage media for communication Download PDF

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Publication number
WO2020258046A1
WO2020258046A1 PCT/CN2019/092845 CN2019092845W WO2020258046A1 WO 2020258046 A1 WO2020258046 A1 WO 2020258046A1 CN 2019092845 W CN2019092845 W CN 2019092845W WO 2020258046 A1 WO2020258046 A1 WO 2020258046A1
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WIPO (PCT)
Prior art keywords
dmrs
symbols
repetition
transmission
occasions
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PCT/CN2019/092845
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English (en)
French (fr)
Inventor
Yukai GAO
Gang Wang
Original Assignee
Nec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nec Corporation filed Critical Nec Corporation
Priority to CN201980097787.9A priority Critical patent/CN114009135A/zh
Priority to PCT/CN2019/092845 priority patent/WO2020258046A1/en
Priority to JP2021576914A priority patent/JP7380719B2/ja
Publication of WO2020258046A1 publication Critical patent/WO2020258046A1/en
Priority to JP2023188114A priority patent/JP2024001327A/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices and computer storage media for communication.
  • a network device for example, a next generation NodeB (gNB)
  • gNB next generation NodeB
  • TRPs Transmission and Reception Points
  • the network device can communicate with a terminal device (for example, a user equipment (UE) ) via one or more of the multiple TRPs or antenna panels, which is also referred to as “multi-TRP communication” .
  • UE user equipment
  • single downlink control information can be used to schedule a number of Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH) repetitions to achieve better performance.
  • the number of PDSCH or PUSCH repetitions scheduled by single DCI may be 1, 2, 4 or 8.
  • Each repetition may occupy at least two symbols, one for DMRS of the physical shared channel (that is, PDSCH or PUSCH) and the other for data. Therefore, if the number of repetitions scheduled by single DCI is 4, at least 8 symbols are required. If the number of repetitions scheduled by single DCI is 8, at least 16 symbols are required, which may exceed the length of a slot. That is, if each repetition includes at least one symbol for transmitting/receiving the DMRS, many resources may be wasted and 8 PDSCH or PUSCH repetitions cannot be achieved within one slot.
  • example embodiments of the present disclosure provide methods, devices and computer storage media for communication.
  • a method of communication comprises: determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of transmission control indication (TCI) states to be used for communication with a further device over the physical shared channel; in response to a plurality of transmission occasions of the physical shared channel being configured to be scheduled by the control information, determining, from the plurality of transmission occasions, a set of transmission occasions associated with one TCI state of the plurality of TCI states; determining, for the set of transmission occasions, respective resource allocations for transmitting at least one Demodulation Reference Signal (DMRS) of the physical shared channel to the further device; and transmitting, based on the resource allocations and the TCI state, the at least one DMRS to the further device during the set of transmission occasions.
  • TCI transmission control indication
  • a method of communication comprises: determining, at a device, control information for scheduling a physical shared channel, the control information indicating a plurality of transmission control indication (TCI) states to be used for communication with a further device over the physical shared channel; in response to a plurality of reception occasions of the physical shared channel being configured to be scheduled by the control information, determining, from the plurality of reception occasions, a set of reception occasions associated with one TCI state of the plurality of TCI states; determining, for the set of reception occasions, respective resource allocations for receiving at least one Demodulation Reference Signal (DMRS) of the physical shared channel from the further device; and receiving, based on the resource allocations and the TCI state, the at least one DMRS from the further device during the set of reception occasions.
  • TCI transmission control indication
  • a device of communication comprises a processor and a memory.
  • the memory is coupled to the processor and stores instructions thereon.
  • the instructions when executed by the processor, cause the device to perform actions comprising: determining, at the device, control information for scheduling a physical shared channel, the control information indicating a plurality of transmission control indication (TCI) states to be used for communication with a further device over the physical shared channel; in response to a plurality of transmission occasions of the physical shared channel being configured to be scheduled by the control information, determining, from the plurality of transmission occasions, a set of transmission occasions associated with one TCI state of the plurality of TCI states; determining, for the set of transmission occasions, respective resource allocations for transmitting at least one Demodulation Reference Signal (DMRS) of the physical shared channel to the further device; and transmitting, based on the resource allocations and the TCI state, the at least one DMRS to the further device during the set of transmission occasions.
  • TCI transmission control indication
  • a device of communication comprises a processor and a memory.
  • the memory is coupled to the processor and stores instructions thereon.
  • the instructions when executed by the processor, cause the device to perform actions comprising: determining, at the device, control information for scheduling a physical shared channel, the control information indicating a plurality of transmission control indication (TCI) states to be used for communication with a further device over the physical shared channel; in response to a plurality of reception occasions of the physical shared channel being configured to be scheduled by the control information, determining, from the plurality of reception occasions, a set of reception occasions associated with one TCI state of the plurality of TCI states; determining, for the set of reception occasions, respective resource allocations for receiving at least one Demodulation Reference Signal (DMRS) of the physical shared channel from the further device; and receiving, based on the resource allocations and the TCI state, the at least one DMRS from the further device during the set of reception occasions.
  • TCI transmission control indication
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor, cause the at least one processor to perform the method according to the first aspect of the present disclosure.
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor, cause the at least one processor to perform the method according to the second aspect of the present disclosure.
  • FIG. 1 illustrates an example communication network in which some embodiments of the present disclosure can be implemented
  • FIG. 2 illustrates an example signaling chart showing an example process in accordance with some embodiments of the present disclosure
  • FIGs. 3A-3B illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure
  • FIGs. 4A-4B illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure
  • FIGs. 5A-5B illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure
  • FIG. 6 illustrates an example diagram of resource allocations in accordance with some embodiments of the present disclosure
  • FIGs. 7A-7E illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure
  • FIGs. 8A-8D illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure
  • FIGs. 9A-9C illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure
  • FIG. 10 illustrates an example method in accordance with some embodiments of the present disclosure
  • FIG. 11 illustrates an example method in accordance with some embodiments of the present disclosure.
  • FIG. 12 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • FIG. 1 illustrates an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the network 100 includes a network device 110, which is coupled with two TRPs/panels 120-1 and 120-2 (collectively referred to as TRPs 120 or individually referred to as TRP 120) .
  • the network 100 also includes a terminal device 130 served by the network device 110. It is to be understood that the number of network devices, terminal devices and TRPs as shown in FIG. 1 is only for the purpose of illustration without suggesting any limitations.
  • the network 200 may include any suitable number of devices adapted for implementing embodiments of the present disclosure.
  • terminal device refers to any device having wireless or wired communication capabilities.
  • Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • PDAs personal digital assistants
  • portable computers image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • BS base station
  • BS refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB next generation NodeB
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a femto node, a pico node, and the like.
  • TRP refers to an antenna array (with one or more antenna elements) available to the network device located at a specific geographical location.
  • a network device may be coupled with multiple TRPs in different geographical locations to achieve better coverage.
  • the TRP can also be referred to as a “panel” , which also refers to an antenna array (with one or more antenna elements) or a group of antennas.
  • the network device 110 may communicate with the terminal device 130 via the TRPs 120-1 and 120-2.
  • the TRP 120-1 may be also referred to as the first TRP
  • the TRP 120-2 may be also referred to as the second TRP.
  • Each of the TRPs 120 may provide a plurality of beams for communication with the terminal device 130.
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM) and the like.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • single DCI can be used to schedule a number of PDSCH or PUSCH repetitions to achieve better performance.
  • the number of PDSCH or PUSCH repetitions scheduled by single DCI may be 1, 2, 4 or 8.
  • Each repetition may occupy at least two symbols, one for DMRS of the physical shared channel (that is, PDSCH or PUSCH) and the other for data. Therefore, if the number of repetitions scheduled by single DCI is 4, at least 8 symbols are required. If the number of repetitions scheduled by single DCI is 8, at least 16 symbols are required, which may exceed the length of a slot. That is, if each repetition includes at least one symbol for transmitting/receiving the DMRS, many resources may be wasted and 8 PDSCH or PUSCH repetitions cannot be achieved within one slot.
  • Example embodiments of the present disclosure provide a solution for Multi-TRP communication.
  • This solution disables DMRS transmission and reception in at least one of PDSCH or PUSCH repetitions.
  • this solution allows different resource patterns in different repetitions. Therefore, this solution can achieve better resource utilization.
  • the solution can achieve backward compatibility for the scheduling of PDSCH or PUSCH repetitions in the Multi-TRP communication, so as to achieve high performance.
  • FIG. 2 illustrates an example signaling chart showing an example process 200 in accordance with some embodiments of the present disclosure.
  • the process 200 may involve two devices 201 and 202. It is to be understood that the process 200 may include additional acts not shown and/or may omit some acts as shown, and the scope of the present disclosure is not limited in this regard.
  • the device 201 may be may be the terminal device 130 as shown in FIG. 1, while the device 202 may be the network device 110 or the TRP 120 as shown in FIG. 1.
  • the device 202 may determine 240 downlink control information (DCI) for scheduling PUSCH transmission and transmit (not shown in FIG. 2) the DCI to the device 201.
  • the device 201 can determine 210 the control information scheduling the PUSCH from the received DCI.
  • the control information may indicate a plurality of transmission control indication (TCI) states to be used for data communications between the device 201 and the device 202 over the PUSCH.
  • TCI state may indicate one Reference Signal (RS) set as well as parameters that configure quasi co-location (QCL) relationship between RSs within the RS set and DMRS ports for the PUSCH.
  • RS Reference Signal
  • QCL quasi co-location
  • the device 201 may be configured with a plurality of PUSCH repetitions (also referred to as “transmission occasions of the PUSCH” ) to be scheduled by the control information. As shown in FIG. 2, the device 201 may determine 220, from the plurality of PUSCH repetitions, a set of PUSCH repetitions associated with one TCI state of the plurality of TCI states. The device 201 may further determine 230 respective resource allocations for transmitting the set of PUSCH repetitions to the device 202. For example, a resource allocation for one PUSCH repetition may indicate resources (such as, time and/or frequency resources) for transmitting one or more DMRSs of the PUSCH and/or data.
  • resources such as, time and/or frequency resources
  • the device 202 may also be configured with the plurality of PUSCH repetitions (also referred to as “receptions occasions of the PUSCH” ) .
  • the device 202 may determine 250, from the plurality of PUSCH repetitions, a set of PUSCH repetitions associated with one TCI state of the plurality of TCI states (for example, in a same way as the device 201) .
  • the device 202 may further determine 260, for the set of PUSCH repetitions, respective resource allocations for receiving the set of PUSCH repetitions from the device 201 (for example, in a same way as the device 201) . Then, as shown in FIG.
  • the device 201 may transmit 270 the set of PUSCH repetitions to the device 202 based on the determined resource allocations and the TCI state associated with the set of PUSCH repetitions.
  • the device 202 may receive 270, based on the determined resource allocations and the TCI state, the set of PUSCH repetitions from the device 201.
  • the device 201 may be the network device 110 or the TRP 120 as shown in FIG. 1, while the device 202 may be the terminal device 130 as shown in FIG. 1.
  • the device 201 may determine 210 DCI for scheduling PDSCH transmission and transmit the DCI to the device 202.
  • the device 202 can determine 240 the control information scheduling the PDSCH from the received DCI.
  • the control information may indicate a plurality of TCI states to be used for data communications between the device 201 and the device 202 over the PDSCH.
  • a TCI state may indicate one RS set as well as parameters that configure QCL relationship between RSs within the RS set and DMRS ports for the PDSCH. For example, different TCI states may be used for different TRPs.
  • the device 201 may be configured with a plurality of PDSCH repetitions (also referred to as “transmission occasions of the PDSCH” ) to be scheduled by the control information. As shown in FIG. 2, the device 201 may determine 220, from the plurality of PDSCH repetitions, a set of PDSCH repetitions associated with one TCI state of the plurality of TCI states. The device 201 may further determine 230 respective resource allocations for transmitting the set of PDSCH repetitions to the device 202. For example, a resource allocation for one PDSCH repetition may indicate respective resources (such as, time and/or frequency resources) for transmitting one or more DMRSs of the PDSCH and/or data.
  • a resource allocation for one PDSCH repetition may indicate respective resources (such as, time and/or frequency resources) for transmitting one or more DMRSs of the PDSCH and/or data.
  • the device 202 may also be configured with the plurality of PDSCH repetitions (also referred to as “reception occasions of the PDSCH” ) .
  • the device 202 may determine 250, from the plurality of PDSCH repetitions, a set of PDSCH repetitions associated with one TCI state of the plurality of TCI states (for example, in a same way as the device 201) .
  • the device 202 may further determine 260, for the set of PDSCH repetitions, respective resource allocations for receiving the set of PDSCH repetitions from the device 201 (for example, in a same way as the device 201) . Then, as shown in FIG.
  • the device 201 may transmit 270 the set of PDSCH repetitions to the device 202 based on the determined resource allocations and the TCI state associated with the set of PDSCH repetitions.
  • the device 202 may receive 270, based on the determined resource allocations and the TCI state, the set of PDSCH repetitions from the device 201.
  • a resource allocation may be determined based on at least one of the following: the number of additional DMRSs configured for the physical shared channel; a slot format; the number of repetitions; respective lengths of repetitions (such as, the number of symbols occupied by each repetition) ; the maximum length among the repetitions (such as, the maximum number of symbols occupied by one repetition among the repetitions) ; a resource mapping type of the physical shared channel (such as, PDSCH mapping type A or PDSCH mapping type B as specified in Release 15 of 3GPP specifications) ; a DMRS configuration type (such as, DMRS type 1 or DMRS type 2 as specified in Release 15 of 3GPP specifications) ; a number of DMRS CDM (Code Domain Multiplexing) group (s) without data (as specified in Release 15 of 3GPP specifications) , a starting position or symbol index of DMRS (such as, the higher layer parameter
  • N TCI states (where N is an integer and 1 ⁇ N ⁇ 4) , a total of R repetitions (where R is an integer and 2 ⁇ R ⁇ 32) of a physical shared channel (such as, PUSCH or PDSCH) and a total of L j symbols for one repetition (where L j is an integer and 1 ⁇ L j ⁇ 14 , and j is an integer and 1 ⁇ j ⁇ R) may be configured at a device (such as, the device 201 or 202) .
  • one of the N TCI states may be associated with k repetitions selected from the total R repetitions (where k ⁇ 1) .
  • the total L j symbols for one repetition may include data symbol (s) and/or DMRS symbol (s) .
  • the k repetitions associated with a same TCI state there may be no transmission/reception occasion associated with another TCI state between two adjacent repetitions in the k repetitions.
  • the k repetitions associated with a same TCI state may be contiguous in sub-slots or symbols. Alternatively, in some embodiments, the k repetitions associated with a same TCI state may be not contiguous in symbols.
  • N may be one of ⁇ 1, 2, 4 ⁇ .
  • R may be equal to 2.
  • the number of TCI states N may be 2.
  • the number of TCI states N may be 2.
  • the total number of symbols for the first repetition (also referred to as “the symbol length” or “the length” of the first repetition)
  • the number of DMRS symbols for the first repetition may be M 1 (where M 1 is an integer and 1 ⁇ M 1 ⁇ 4)
  • the total number of symbols for the second repetition may be L 2 (where L 2 is an integer and 1 ⁇ L 2 ⁇ 14)
  • the number of DMRS symbols for the second repetition may be M 2 (where M 2 is an integer and 1 ⁇ M 2 ⁇ 4) .
  • the value of L 1 may be different from the value of L 2 .
  • the value of M 1 may be different from the value of M 2 .
  • the position of the first DMRS in the first repetition and the position of the first DMRS in the second repetition may be different.
  • the position of the first DMRS in the first repetition may be the first symbol within the total L 1 symbols.
  • the position of the second DMRS in the second repetition may be not the first symbol within the total L 2 symbols.
  • the position of the second DMRS in the second repetition may be the second symbol within the total L 2 symbols.
  • R may be an integer and 2 ⁇ R ⁇ 32.
  • R may be one of ⁇ 3, 4, 5, 6, 7, 8, 10, 12, 14, 16 ⁇ .
  • the symbol length of each repetition L j may be the same.
  • respective symbol lengths L j and L g (where j is an integer and 1 ⁇ j ⁇ R, g is an integer and 1 ⁇ g ⁇ R, and g ⁇ j) of at least two different repetitions may be different.
  • the maximum symbol length among the R repetitions may be L (where L is an integer and 1 ⁇ L ⁇ 14) .
  • L may be one of ⁇ 1, 2, 3, 4, 5, 6, 7 ⁇ .
  • the number of DMRS symbols M j for each repetition may be the same. In some embodiments, the numbers of DMRS symbols M j and M g (where j is an integer and 1 ⁇ j ⁇ R, g is an integer and 1 ⁇ g ⁇ R, and g ⁇ j) for at least two different repetitions may be different. In some embodiments, the maximum number of DMRS symbols among the R repetitions may be M (where M is an integer and 1 ⁇ M ⁇ 4) . In some embodiments, M may be 1 or 2.
  • the total number of symbols, the number of DMRS symbols and/or the position (s) of the DMRS symbol (s) for different repetitions may be different.
  • the total number of symbols, the number of DMRS symbols and/or the position of the DMRS symbol (s) for different repetitions may be the same; and if R is an integer and 2 ⁇ R ⁇ 32, the total number of symbols , the number of DMRS symbols and/or the position (s) of the DMRS symbol (s) for at least two different repetitions may be different.
  • FDMed data frequency-division multiplexed
  • the number of DMRS CDM group (s) without data may be fixed to 2.
  • the number of DMRS CDM group (s) without data is fixed to 3.
  • the number of symbols for front-loaded DMRS may be limited to 1. In some embodiments, the maximum number of total symbols occupied by one repetition may be at least 2.
  • R may be equal to 2.
  • the number of TCI states N may be 2.
  • the number of TCI states N may be 2.
  • the total number of symbols for the first repetition (also referred to as “the symbol length” or “the length” of the first repetition)
  • the number of DMRS symbols for the first repetition may be M 1 (where M 1 is an integer and 1 ⁇ M 1 ⁇ 4)
  • the total number of symbols for the second repetition may be L 2 (where L 2 is an integer and 1 ⁇ L 2 ⁇ 14)
  • the number of DMRS symbols for the second repetition may be M 2 (where M 2 is an integer and 1 ⁇ M 2 ⁇ 4) .
  • the value of L 1 may be different from the value of L 2 .
  • the value of M 1 may be different from the value of M 2 .
  • the position of the first DMRS in the first repetition and the position of the first DMRS in the second repetition may be different.
  • the position of the first DMRS in the first repetition may be the first symbol within the total L 1 symbols.
  • the position of the second DMRS in the second repetition may be not the first symbol within the total L 2 symbols.
  • the position of the second DMRS in the second repetition may be the second symbol within the total L 2 symbols.
  • FIG. 3A and FIG. 3B illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure.
  • FIG. 3A and FIG. 3B each illustrate k repetitions 310 i , 310 i+1 ... 310 i+k-1 associated with a same TCI state, where k ⁇ 1.
  • the total numbers of symbols occupied by the k repetitions are L i , L i+1 ... L i+k-1 respectively.
  • Each of L i , L i+1 ... L i+k-1 may be an integer and within a range [1, L] .
  • symbols occupied by one repetition may be indexed with relative values within the repetition.
  • symbols occupied by the repetition 310 i may be indexed with (1, 2, ...L i ) ; symbols occupied by the repetition 310 i+1 may be indexed with (1, 2, ...L i+1 ) ; ...and symbols occupied by the repetition 310 i+k-1 may be indexed with (1, 2, ...L i+k-1 ) .
  • the numbers of DMRS symbols for the k repetitions may be M i , M i+1 ... M i+k-1 respectively. In each of the k repetitions, the number of DMRSs can be 0, 1 or 2. That is, in each of the k repetitions, the maximum number of DMRS symbols may be M, where M can be 1 or 2.
  • the position of the first DMRS in the repetition may be not the first symbol within the repetition.
  • the position of the first DMRS in the repetition may be the first symbol within the repetition.
  • respective symbol lengths L j and L g (where j is an integer and 1 ⁇ j ⁇ k, g is an integer and 1 ⁇ g ⁇ k, and g ⁇ j) for at least two different repetitions may be different.
  • the numbers of DMRS symbols M j and M g (where j is an integer and 1 ⁇ j ⁇ k, g is an integer and 1 ⁇ g ⁇ k, and g ⁇ j) for at least two different repetitions may be different.
  • the position (s) for DMRS symbol (s) within one repetition may be at least in part different from the position (s) for DMRS symbol (s) within the other repetition.
  • the DMRS may be FDMed with data within the W symbol (s) .
  • the DMRS may be FDMed with data within the W symbol (s) .
  • the transmit power of the data in the W symbol (s) without DMRS FDMed with the data may exceed the transmit power of the data in the W symbol (s) with DMRS FDMed with the data.
  • For at least one of the remaining k-1 repetitions there may be no DMRS mapped within the W symbol (s) .
  • the indicated number of DMRS ports for the PDSCH/PUSCH transmission may be less than 4.
  • the indicated number of DMRS ports for the PDSCH/PUSCH transmission may be limited to 1.
  • the indicated DMRS port (s) for the PDSCH/PUSCH transmission may be one of the following: ⁇ port 0 ⁇ , ⁇ port 1 ⁇ , ⁇ port 0 and port 1 ⁇ , ⁇ port 4 ⁇ , ⁇ port 5 ⁇ , ⁇ port 4 and port 5 ⁇ , ⁇ port 0 and port 1 and port 4 ⁇ or ⁇ port 0 and port 1 and port 4 and port 5 ⁇ .
  • the indicated DMRS port (s) for the PDSCH/PUSCH transmission may be mapped to resource elements (represented as “REs” in the following) with even indices.
  • resource elements represented as “REs” in the following
  • the indices of REs for DMRS mapping may include ⁇ 0, 2, 4, 6, 8, 10 ⁇ .
  • the indicated DMRS port (s) for the PDSCH/PUSCH transmission may be mapped to REs with even indices (also referred to as “even REs” ) in the frequency domain.
  • the DMRS may be FDMed with data within the W symbol (s) .
  • the DMRS may be mapped to the even REs, and the data may be mapped to odd Res (that is, REs with odd indices) .
  • odd Res that is, REs with odd indices
  • for at least one of the k repetitions there may be no DMRS mapped within the W symbol (s) for the repetition.
  • the data may be mapped to odd REs in this repetition, and even REs are remained as blank for this terminal device.
  • the data may be mapped to even REs in this repetition, and odd REs are remained as blank for the terminal device.
  • there may be no DMRS mapped within the W symbol (s) and there are two repetitions within the W symbol (s) .
  • the data for one repetition may be mapped to odd REs in the W symbol (s)
  • the data for the other repetition may be mapped to even REs in the W symbol (s) .
  • the DMRS may be mapped to even REs, and the data may be mapped to odd REs.
  • the n-th repetition and the (n+1) -th repetition may be mapped to the same W symbol (s) .
  • the data for the n-th repetition may be mapped to even REs and the data for the (n+1) -th repetition may be mapped to odd REs.
  • the data for the n-th repetition may be mapped to odd REs and the data for the (n+1) -th repetition may be mapped to even REs.
  • n is an integer and n may be one of ⁇ 2, 4, 5, 6, 7 ⁇ .
  • the indicated number of DMRS ports for the PDSCH/PUSCH transmission may be less than 2 or less than 4.
  • the indicated number of DMRS ports for the PDSCH/PUSCH transmission may be limited to 1.
  • the indicated DMRS port (s) for the PDSCH/PUSCH transmission may be one of the following: ⁇ port 0 ⁇ , ⁇ port 1 ⁇ , ⁇ port 0 and port 1 ⁇ , ⁇ port 6 ⁇ , ⁇ port 7 ⁇ , ⁇ port 0 and port 6 ⁇ , ⁇ port 1 and port 7 ⁇ , ⁇ port 6 and port 7 ⁇ , ⁇ port 0 and port 1 and port 6 ⁇ or ⁇ port 0 and port 1 and port 6 and port 7 ⁇ .
  • the indicated DMRS port (s) for the PDSCH/PUSCH transmission may be mapped to REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain.
  • the DMRS may be FDMed with data within the W symbol (s) .
  • the DMRS may be mapped to REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain, and the data may be mapped to REs indexed with ⁇ 2, 3, 4, 5, 8, 9, 10, 11 ⁇ in frequency domain.
  • the data may be mapped to REs indexed with ⁇ 2, 3, 4, 5, 8, 9, 10, 11 ⁇ in frequency domain, and REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain may be remained as blank for the terminal device.
  • the data may be mapped to REs indexed with ⁇ 0, 1, 2, 3, 6, 7, 8, 9 ⁇ in frequency domain, and REs indexed with ⁇ 4, 5, 10, 11 ⁇ in frequency domain may be remained as blank for the terminal device.
  • there may be a DMRS mapped within the W symbol (s) .
  • there may be a DMRS FDMed with data.
  • the DMRS may be mapped to REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain, and the data may be mapped to REs indexed with ⁇ 2, 3, 4, 5, 8, 9, 10, 11 ⁇ in frequency domain.
  • m is an integer and m may be one of ⁇ 1, 2, 3, 4, 5, 6, 7, 8 ⁇ .
  • the n-th repetition and the (n+1) -th repetition may be mapped to the same W symbol (s) .
  • the data for the n-th repetition may be mapped to REs indexed with ⁇ 2, 3, 4, 5, 8, 9, 10, 11 ⁇ in frequency domain and the data for the (n+1) -th repetition may be mapped to REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain.
  • the data for the n-th repetition may be mapped to REs indexed with ⁇ 0, 1, 2, 3, 6, 7, 8, 9 ⁇ in frequency domain and the data for the (n+1) -th repetition may be mapped to REs with frequency domain index ⁇ 4, 5, 10, 11 ⁇ in frequency domain.
  • n is an integer and n may be one of ⁇ 2, 3, 4, 5, 6, 7, 8 ⁇ .
  • f is an integer and f may be one of ⁇ 2, 3, 4, 5, 6, 7, 8 ⁇ .
  • a and B are both integer, where 2 ⁇ A ⁇ 14 and 2 ⁇ B ⁇ 14 and where A ⁇ B, and.
  • W 2 ⁇ A ⁇ 14 and 2 ⁇ B ⁇ 14 and where A ⁇ B
  • a part of the data for the f-th repetition may be mapped to REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain in symbols A and A+1, and the remaining part of data for the f-th repetition may be mapped to REs indexed with ⁇ 4, 5, 10, 11 ⁇ in frequency domain in symbols B and B+1.
  • f is an integer f may be one of ⁇ 2, 3, 4, 5, 6, 7, 8 ⁇ .
  • a and B are both integers, where2 ⁇ A ⁇ 13 and 2 ⁇ B ⁇ 13 and where A ⁇ B.
  • the indicated number of DMRS ports for the PDSCH/PUSCH transmission may be less than 4 or less than 8.
  • the indicated DMRS port (s) for the PDSCH/PUSCH transmission may be one of the following: ⁇ port 0 ⁇ , ⁇ port 1 ⁇ , ⁇ port 2 ⁇ , ⁇ port 3 ⁇ , ⁇ port 0 and port 1 ⁇ , ⁇ port 2 and port 3 ⁇ , ⁇ port 0 and port 2 ⁇ , ⁇ port 0 and port 1 and port 2 ⁇ , ⁇ port 0 and port 1 and port 2 and port 3 ⁇ , ⁇ port 6 ⁇ , ⁇ port 7 ⁇ , ⁇ port 6 and port 7 ⁇ , ⁇ port 8 ⁇ , ⁇ port 9 ⁇ , ⁇ port 8 and port 9 ⁇ , ⁇ port 0 and port 1 and port 6 ⁇ , ⁇ port 0 and port 1 and port 2 ⁇ , ⁇ port 0 and port 1 and port
  • the indicated DMRS port (s) for the PDSCH/PUSCH transmission may be mapped to REs indexed with ⁇ 0, 1, 4, 5, 6, 7, 8, 9 ⁇ in frequency domain.
  • the DMRS may be FDMed with data within the W symbol (s) .
  • the DMRS may be mapped to REs indexed with ⁇ 0, 1, 2, 3, 6, 7, 8, 9 ⁇ in frequency domain, and the data may be mapped to REs indexed with ⁇ 4, 5, 10, 11 ⁇ in frequency domain.
  • the data may be mapped to REs indexed with ⁇ 4, 5, 10, 11 ⁇ in frequency domain, and REs indexed with ⁇ 0, 1, 2, 3, 6, 7, 8, 9 ⁇ in frequency domain may be remained as blank for the terminal device.
  • the data may be mapped to REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain, and REs indexed with ⁇ 2, 3, 4, 5, 8, 9, 10, 11 ⁇ in frequency domain may be remained as blank for the terminal device.
  • the DMRS may be mapped to REs indexed with ⁇ 0, 1, 2, 3, 6, 7, 8, 9 ⁇ in frequency domain, and the data may be mapped to REs indexed with ⁇ 4, 5, 10, 11 ⁇ in frequency domain.
  • m is an integer and m may be one of ⁇ 1, 2, 3, 4, 5, 6, 7, 8 ⁇ .
  • the a-th repetition, the b-th repetition and the c-th repetition may be mapped to the same W symbol (s) .
  • the data for the a-th repetition may be mapped to REs indexed with ⁇ 0, 1, 6, 7 ⁇ in frequency domain and the data for the b-th repetition may be mapped to REs indexed with ⁇ 2, 3, 8, 9 ⁇ in frequency domain, and the data for the c-th repetition may be mapped to REs indexed with ⁇ 4, 5, 10, 11 ⁇ in frequency domain.
  • a, b and c each are an integer, where a may be one of ⁇ 2, 3, 4, 5, 6, 7, 8 ⁇ , b may be one of ⁇ 2, 3, 4, 5, 6, 7, 8 ⁇ and c may be one of ⁇ 2, 3, 4, 5, 6, 7, 8 ⁇ and where a ⁇ b ⁇ c.
  • the symbol length of the repetition may be L and the number of DMRS symbols in the repetition may be M.
  • the symbol length of the repetition may not exceed L and/or the number of DMRS symbols in the repetition may not exceed M.
  • M 1.
  • the first symbol (such as, the symbol index thereof is 1) in the repetition may be used for DMRS.
  • the symbol index for the DMRS symbol is X, where X is an integer and 2 ⁇ X ⁇ L.
  • M 2.
  • the two DMRS symbols may include the first symbol (such as, the symbol index thereof is 1) in the repetition and another symbols (such as, the symbol index thereof is X, where X is an integer and 2 ⁇ X ⁇ L) in the repetition.
  • the remaining k-1 repetitions there may be no symbol for DMRS. That is, DMRS transmission/reception may be disabled in the repetition.
  • there may be one symbol for DMRS and the position of the DMRS symbol may be the first symbol in the repetition.
  • there may be one symbol for DMRS and the position of the DMRS symbol may be X, where X is an integer and 2 ⁇ X ⁇ L in the repetition.
  • the remaining k-1 repetitions there may be two symbols for DMRS and at least one of the positions of the two DMRS symbols in the repetition may be different from the positions of the DMRS symbols in the first one of the k repetitions.
  • there may be two symbols for DMRS and the position of the first DMRS symbol in the repetition may be the first symbol within the repetition.
  • there may be two symbols for DMRS and the position of the first DMRS symbol in the repetition may be the second symbol within the repetition.
  • the position of the second DMRS symbol in the repetition may be Y, where Y is an integer and 2 ⁇ Y ⁇ L in the repetition and where Y ⁇ X.
  • the symbol length of the repetition may be L and the number of DMRS symbols in the repetition may be M.
  • the number of DMRS symbols in the latter repetition may be M (that is, the maximum number of DMRS symbols among the repetitions)
  • the symbol index of the first one of the DMRS symbols in the latter repetition may be 2 (that is, not the first symbol in the latter repetition) . This is because the first symbol in the latter repetition may be affected by beam switching and/or Automatic Gain Control (AGC) adjustment.
  • AGC Automatic Gain Control
  • a network device may indicate a configuration of redundancy version (represented as “RV” in the following) to a terminal device.
  • RV redundancy version
  • RV id an RV indication field
  • T available values for RV id or T available sequences of RVs may be different for different.
  • the repetitions associated with a same TCI state may be transmitted adjacently.
  • the repetitions associated with a first TCI state may be transmitted firstly, and any one of the repetitions associated with a second TCI state may be transmitted after the repetitions associated with the first TCI state. For example, for the k repetitions associated with a same TCI state, there may be no transmission/reception occasion associated with another TCI state between two adjacent repetitions in the k repetitions.
  • each of the second set of values may be different from any one of the first set of values.
  • each of the second set of sequences of RVs may be different from any one of the first set of sequences of RVs.
  • the repetitions associated with different TCI states may be transmitted adjacently. For example, for any pair of two adjacent repetitions, the two repetitions are associated with two different TCI states.
  • the sequence of RVs may be one of the following: ⁇ 0 2 3 1 ⁇ , ⁇ 2 3 1 0 ⁇ , ⁇ 3 1 0 2 ⁇ , ⁇ 1 0 2 3 ⁇ , ⁇ 0 2 ⁇ , ⁇ 2 3 ⁇ , ⁇ 3 1 ⁇ or ⁇ 1 0 ⁇ .
  • any four adjacent RVs in the RV sequence may be ⁇ 0 2 3 1 ⁇ , ⁇ 2 3 1 0 ⁇ , ⁇ 3 1 0 2 ⁇ or ⁇ 1 0 2 3 ⁇ .
  • any two adjacent RVs in the RV sequence may be ⁇ 0 2 ⁇ , ⁇ 2 3 ⁇ , ⁇ 3 1 ⁇ or ⁇ 1 0 ⁇ .
  • the order of associated TCI states for the four repetitions may be ⁇ TCI-A, TCI-A, TCI-B, TCI-B ⁇ .
  • the order of associated TCI states for the 8 repetitions may be ⁇ TCI-A, TCI-A, TCI-A, TCI-A, TCI-B, TCI-B, TCI-B ⁇ .
  • the order of associated TCI states for the 8 repetitions may be ⁇ TCI-A, TCI-A, TCI-B, TCI-B, TCI-C, TCI-C, TCI-D, TCI-D ⁇ .
  • the sequence of RVs may be one of the following: ⁇ 0 3 2 1 ⁇ , ⁇ 3 2 1 0 ⁇ , ⁇ 2 1 0 3 ⁇ , ⁇ 1 0 3 2 ⁇ , ⁇ 0 3 ⁇ , ⁇ 2 1 ⁇ , ⁇ 3 2 ⁇ , ⁇ 1 0 ⁇ , ⁇ 3 0 ⁇ and ⁇ 1 2 ⁇ .
  • any four adjacent RVs in the RV sequence are ⁇ 0 3 2 1 ⁇ , ⁇ 3 2 1 0 ⁇ , ⁇ 2 1 0 3 ⁇ or ⁇ 1 0 3 2 ⁇ .
  • any two adjacent RVs in the RV sequence are ⁇ 0 3 ⁇ , ⁇ 2 1 ⁇ , ⁇ 3 2 ⁇ , ⁇ 1 0 ⁇ or ⁇ 3 0 ⁇ or ⁇ 1 2 ⁇ .
  • the configured number of TCI states for repetition is 2 (for example, represented as TCI-A and TCI-B in the following)
  • the order of associated TCI states for the four repetitions may be ⁇ TCI-A, TCI-B, TCI-A, TCI-B ⁇ .
  • the order of associated TCI states for the 8 repetitions may be ⁇ TCI-A, TCI-B, TCI-A, TCI-B, TCI-A, TCI-B, TCI-A, TCI-B ⁇ .
  • the order of associated TCI states for the 8 repetitions may be ⁇ TCI-A, TCI-B, TCI-C, TCI-D, TCI-A, TCI-B, TCI-C, TCI-D ⁇ .
  • FIG. 4A illustrates an example diagram of resource allocations in traditional schemes.
  • TCI states that are, TCI-A and TCI-B
  • the repetitions 410-1 and 410-2 are associated with TCI-A
  • the repetitions 410-3 and 410-4 are associated with TCI-B.
  • Each repetition 410 may include 2 symbols, one for DMRS and one for data. That is, according to traditional schemes, at least 8 symbols are required for this case.
  • DMRS symbols in the repetitions 410-2 and 410-4 can be omitted.
  • FIG. 4B illustrates an example diagram of resource allocations in accordance with embodiments of the present disclosure. As shown in FIG. 4B, the DMRS symbols in the repetitions 410-2 and 410-4 are omitted, so as to achieve better resource utilization.
  • the number of front-loaded DMRS symbols may be H (for example, H may be 1 or 2) .
  • the total number of symbols may be 2, the number of DMRS symbols may be 1 and the DMRS may be mapped to the first or second symbol of the 2 symbols.
  • the total number of symbols may be 1 or 2 and the number of DMRS symbols may be 0. That is, there may be no DMRS mapping in the second repetition.
  • the total number of symbols may be 2, the number of DMRS symbols may be 1, and the DMRS may be mapped to the second symbol of the 2 symbols.
  • the total number of symbols in one repetition may be 2, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the first or second symbol of the 2 symbols in the repetition.
  • the total number of symbols in one repetition may be 1 or 2 and the number of DMRS symbols in the repetition may be 0. That is, there may be no DMRS mapping in the second and/or third repetitions.
  • the total number of symbols may be 2, the number of DMRS symbols may be 1 and the DMRS may be mapped to the second symbol of the 2 symbols.
  • the total number of symbols in one repetition may be 2, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the first or second symbol of the 2 symbols in the repetition.
  • the total number of symbols in one repetition may be 1 or 2 and the number of DMRS symbols in the repetition may be 0. That is, there may be no DMRS mapping in the second and/or third repetitions.
  • the total number of symbols in one repetition may be 2, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the second symbol of the 2 symbols in the repetition.
  • the total number of symbols may be 3, the number of DMRS symbols may be 1, and the DMRS may be mapped to the first or second one of the L symbols.
  • the total number of symbols may be 2 or 3 and the number of DMRS symbols may be 0. That is, there may be no DMRS mapping in the second repetition.
  • the total number of symbols may be 3, the number of DMRS symbols may be 1 and the DMRS may be mapped to the second or the third symbol of the L symbols.
  • the total number of symbols may be 4, the number of DMRS symbols may be 1 and the DMRS may be mapped to the first or second one of the L symbols. In some embodiments, for the second repetition, the total number of symbols may be 3 or 4 and the number of DMRS symbols may be 0. That is, there may be no DMRS mapping in the second repetition. In some embodiments, for the second repetition, the total number of symbols may be 4, the number of DMRS symbols may be 1 and the DMRS may be mapped to the third or the fourth symbol of the L symbols.
  • the total number of symbols may be 5, the number of DMRS symbols may be 1 and the DMRS may be mapped to the first or second one of the L symbols.
  • the total number of symbols may be 4 or 5 and the number of DMRS symbols may be 0. That is, there may be no DMRS mapping in the second repetition.
  • the total number of symbols may be 5, the number of DMRS symbols may be 1 and the DMRS may be mapped to the third, fourth or fifth symbol of the L symbols.
  • the total number of symbols may be 6, the number of DMRS symbols may be 1 and the DMRS may be mapped to the first or second one of the L symbols.
  • the total number of symbols may be 5 or 6 and the number of DMRS symbols may be 0. That is, there may be no DMRS mapping in the second repetition.
  • the total number of symbols may be 6, the number of DMRS symbols may be 1 and the DMRS may be mapped to the fourth or fifth symbol of the L symbols.
  • the total number of symbols may be 7, the number of DMRS symbols may be 1 and the DMRS may be mapped to the first or second one of the L symbols.
  • the total number of symbols may be 6 or 7 and the number of DMRS symbols may be 0. That is, there may be no DMRS mapping in the second repetition.
  • the total number of symbols may be 7, the number of DMRS symbols may be 1 and the DMRS may be mapped to the fourth, fifth, sixth or seventh one of the L symbols.
  • the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the first or second symbol of the 3 symbols in the repetition.
  • the total number of symbols in one repetition may be 2 or 3 and the number of DMRS symbols in the repetition may be 0. That is, there may be no DMRS mapping in the second and/or the third repetition.
  • the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the second one of the 3 symbols in the repetition.
  • the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the first or second symbol of the 3 symbols in the repetition.
  • the total number of symbols in one repetition may be 2 or 3 and the number of DMRS symbols in the repetition may be 0. That is, there may be no DMRS mapping in the second and/or third repetitions.
  • the total number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the second symbol of the 3 symbols in the repetition.
  • the total number of symbols in one repetition may be 4, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the first or second symbol of the 4 symbols in the repetition.
  • the total number of symbols in one repetition may be 3 or 4 and the number of DMRS symbols in the repetition may be 0. That is, there may be no DMRS mapping in the second and/or the third repetition.
  • the total number of symbols in one repetition may be 4, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the second symbol of the 4 symbols in the repetition.
  • the number of symbols in each repetition may be 3, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the first symbol of the 3 symbols in the repetition.
  • the number of symbols may be 4, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and fourth symbol of the 4 symbols.
  • the number of symbols may be 3, the number of DMRS symbols may be 1 and the DMRS may be mapped to the third symbol of the 3 symbols.
  • the number of symbols may be 4, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and fourth symbols of the 4 symbols.
  • the number of symbols may be 3, the number of DMRS symbols may be 1 and the DMRS may be mapped to the first symbol of the 3 symbols.
  • the number of symbols may be 5, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and fifth symbols of the 5 symbols.
  • the number of symbols may be 4, the number of DMRS symbols may be 1 and the DMRS may be mapped to the fourth symbol of the 4 symbols.
  • the number of symbols may be 5, the number of DMRS symbols mapping may be 2 and the DMRS may be mapped to the first and fifth symbols of the 5 symbols.
  • the number of symbols may be 4, the number of DMRS symbols may be 1 and the DMRS may be mapped to the first symbol of the 4 symbols.
  • the number of symbols may be 5, the number of DMRS symbols may be 2, and the DMRS may be mapped to the first and fourth symbol of the 5 symbols.
  • the number of symbols may be 4, the number of DMRS symbols may be 1 and the DMRS may be mapped to the second symbol of the 4 symbols.
  • the number of symbols may be 4, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and fourth symbols of the 4 symbols.
  • the number of symbols may be 4, the number of DMRS symbols may be 1 and the DMRS may be mapped to the third symbol of the 4 symbols.
  • the number of symbols may be 5, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and fourth symbols of the 5 symbols.
  • the number of symbols may be 5, the number of DMRS symbols may be 2 and the DMRS may be mapped to the second and the fifth symbols of the 5 symbols.
  • the number of symbols may be 5, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and fifth symbols of the 5 symbols.
  • the number of symbols may be 5, the number of DMRS symbols may be 1 and the DMRS may be mapped to the fourth symbol of the 5 symbols.
  • the number of symbols may be 6, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and fifth symbols of the 6 symbols.
  • the number of symbols may be 5, the number of DMRS symbols may be 1 and the DMRS may be mapped to the third symbol of the 5 symbols.
  • the number of symbols in one repetition may be 6, the number of DMRS symbols in the repetition may be 2 and the DMRS may be mapped to the first and fourth symbols of the 6 symbols in the repetition.
  • the number of symbols may be 6, the number of DMRS symbols may be 2 and the DMRS may be mapped to the first and sixth symbols of the 6 symbols.
  • the number of symbols may be 6, the number of DMRS symbols may be 1 and the DMRS may be mapped to the fourth symbol of the 6 symbols.
  • the number of symbols in one repetition may be 3, the number of DMRS symbols in the repetition may be 1 and the DMRS may be mapped to the first symbol of the 3 symbols in the repetition.
  • the number of symbols may be 3, the number of DMRS symbols may be 1 and the DMRS may be mapped to the second symbol of the 3 symbols.
  • the number of symbols in one repetition may be 2 and the number of DMRS symbols in the repetition may be 0.
  • the number of symbols may be 3, and the number of DMRS symbols may be 1, and the DMRS may be mapped to the third symbol of the 3 symbols.
  • the available values for k may include at least one of 2, 3 and 4.
  • the available values for k may include at least one of 2, 3 and 4.
  • the available values for k may include at least one of 2 and 3.
  • FIGs. 5A-5B illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure.
  • TCI-A and TCI-B TCI states
  • a total of 8 repetitions 510-1, 510-2, 510-3 and 510-4 (collectively or individually referred to as repetition (s) 510) .
  • the repetitions 510-1 and 510-3 associated with TCI-Aeach include one DMRS symbol, while DMRS symbols in the repetitions 510-2 and 510-4 are omitted.
  • the repetitions 510-5 and 510-7 associated with TCI-B each include one DMRS symbol, while DMRS symbols in the repetitions 510-6 and 510-8 are omitted.
  • the repetition 510-1 associated with TCI-A includes one DMRS symbol, while DMRS symbols in the repetitions 510-2, 510-3 and 510-4 are omitted.
  • the repetition 510-5 associated with TCI-B includes one DMRS symbol, while DMRS symbols in the repetitions 510-6, 510-7 and 510-8 are omitted. In this way, 8 PDSCH or PUSCH repetitions can be achieved within one slot.
  • the resource allocations for different repetitions may be different.
  • DMRS symbols may have different positions.
  • FIG. 6 illustrates an example diagram of resource allocations in accordance with some embodiments of the present disclosure.
  • TCI states that are, TCI-A and TCI-B
  • the repetitions 610-1 and 610-2 are associated with TCI-A.
  • the position of the DMRS symbol in the repetition 610-1 and the position of the DMRS symbol in the repetition 610-2 are different.
  • the repetitions 610-3 and 610-4 are associated with TCI-B.
  • the position of the DMRS symbol in the repetition 610-3 and the position of the DMRS symbol in the repetition 610-4 are different.
  • the number of DMRS symbols and/or their positions in each repetition may depend on at least one of the following: the number of additional DMRSs configured for the physical shared channel (such as, PUSCH or PDSCH) ; a slot format; the number of repetitions; the symbol length of each repetition; a resource mapping type of the physical shared channel (such as, PDSCH mapping type A or PDSCH mapping type B as specified in Release 15 of 3GPP specifications) ; and one or more DMRS position parameters (such as, dmrs-AdditionalPosition for PDSCH mapping type A or PDSCH mapping type B as specified in Release 15 of 3GPP specifications) associated with the resource mapping type.
  • FIG. 7A-7E illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure.
  • TCI-A and TCI-B TCI states
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type B
  • no additional DMRS is configured for the PDSCH.
  • 4 repetitions may be associated with a same TCI state.
  • the total number of symbols for DMRS and data for the 4 repetitions may be 5.
  • TCI-A as an example, for the repetition 710-1, there are 2 symbols, where the first one is used for DMRS transmission/reception and the second one is used for data transmission/reception.
  • DMRS symbols are omitted and the symbol length of the repetition 710-2, 710-3 or 710-4 is 1.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type B
  • one or more additional DMRSs are configured for the PDSCH.
  • 4 repetitions may be associated with a same TCI state.
  • the total number of symbols for DMRS and data for the 4 repetitions may be 6.
  • TCI-A as an example, for the repetitions 710-1 and 710-4, there are 2 symbols in each repetition, where the first one is used for DMRS transmission/reception and the second one is used for data transmission/reception.
  • DMRS symbols are omitted and the symbol length of the repetition 710-2 or 710-3 is 1.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • no additional DMRS is configured for the PDSCH.
  • the resource allocations for the repetitions may be the same as those shown in FIG. 7A.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • one additional DMRS is configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 2.
  • the resource allocations may be the same as those shown in FIG. 7A.
  • the resource allocations for the repetitions may be shown in FIG. 7C.
  • 4 repetitions may be associated with a same TCI state.
  • the total number of symbols for DMRS and data for the 4 repetitions may be 6. Taking TCI-A as an example, for the repetitions 710-1 and 710-4, there are 2 symbols in each repetition.
  • the first symbol in the repetition 710-1 and the second symbol in the repetition 710-4 are used for DMRS transmission/reception and the second symbol in the repetition 710-1 and the first symbol in the repetition 710-4 are used for data transmission/reception.
  • DMRS symbols are omitted and the symbol length of the repetition 710-2 or 710-3 is 1.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • one additional DMRS is configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 3.
  • the resource allocations for the repetitions may be the same as those shown in FIG. 7B.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • two additional DMRSs are configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 2.
  • the resource allocations for the repetitions may be the same as those shown in FIG. 7B.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • two additional DMRSs are configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 3.
  • the resource allocations for the repetitions may be shown in FIG. 7D or 7E.
  • the number of DMRS symbols and/or their positions in each repetition may depend on at least one of the following: the number of additional DMRSs configured for the physical shared channel (such as, PUSCH or PDSCH) ; a slot format; the number of repetitions; the symbol length of each repetition; a resource mapping type of the physical shared channel (such as, PDSCH mapping type A or PDSCH mapping type B as specified in Release 15 of 3GPP specifications) ; and one or more DMRS position parameters (such as, dmrs-AdditionalPosition for PDSCH mapping type A or PDSCH mapping type B as specified in Release 15 of 3GPP specifications) associated with the resource mapping type.
  • FIG. 8A-8D illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure.
  • TCI-A and TCI-B TCI states
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • no additional DMRS is configured for the PDSCH.
  • 2 repetitions may be associated with a same TCI state.
  • the total number of symbols for DMRS and data for the 2 repetitions may be 5.
  • TCI-A as an example, for the repetition 810-1, there are 3 symbols, where the first one is used for DMRS transmission/reception and the remaining two are used for data transmission/reception.
  • the DMRS symbol is omitted and the symbol length of the repetition 810-2 is 2.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • one additional DMRS is configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 2.
  • the resource allocations may be the same as those shown in FIG. 8A.
  • the resource allocations for the repetitions may be shown in FIG. 8B. As shown in FIG. 8B, 2 repetitions may be associated with a same TCI state. The total number of symbols for DMRS and data for the 2 repetitions may be 6.
  • repetitions 810-1 and 810-2 associated with TCI-A there are 3 symbols in each repetition, where the first symbol in the repetition 810-1 and the last symbol in the repetition 810-2 are used for DMRS transmission/reception, and the remaining symbols in the repetitions 810-1 and 810-2 are used for data transmission/reception.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • two additional DMRSs are configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 2.
  • 2 repetitions may be associated with a same TCI state. Taking the repetitions 810-1 and 810-2 associated with TCI-A as examples, there are 3 symbols in each repetition, where the first symbol in the repetition 810-1 and the second symbol in the repetition 810-2 are used for DMRS transmission/reception, and the remaining symbols in the repetitions 810-1 and 810-2 are used for data transmission/reception.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • two additional DMRSs are configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 3.
  • the resource allocations for the repetitions may be the same as those shown in FIG. 8A or 8B.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • three additional DMRSs are configured for the PDSCH.
  • 2 repetitions may be associated with a same TCI state.
  • the repetitions 810-1 and 810-2 associated with TCI-A there are 3 symbols in each repetition, where the first symbol in the repetition 810-1 and the first symbol in the repetition 810-2 are used for DMRS transmission/reception, and the remaining symbols in the repetitions 810-1 and 810-2 are used for data transmission/reception.
  • the number of DMRS symbols and/or their positions in each repetition may depend on at least one of the following: the number of additional DMRSs configured for the physical shared channel (such as, PUSCH or PDSCH) ; a slot format; the number of repetitions; the symbol length of each repetition; a resource mapping type of the physical shared channel (such as, PDSCH mapping type A or PDSCH mapping type B as specified in Release 15 of 3GPP specifications) ; and one or more DMRS position parameters (such as, dmrs-AdditionalPosition for PDSCH mapping type A or PDSCH mapping type B as specified in Release 15 of 3GPP specifications) associated with the resource mapping type.
  • FIG. 9A-9C illustrate example diagrams of resource allocations in accordance with some embodiments of the present disclosure.
  • TCI-A and TCI-B TCI states
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • no additional DMRS is configured for the PDSCH.
  • 2 repetitions may be associated with a same TCI state.
  • the total number of symbols for DMRS and data for the 2 repetitions may be 7.
  • TCI-A as an example, for the repetition 910-1, there are 4 symbols, where the first one is used for DMRS transmission/reception and the remaining three are used for data transmission/reception.
  • the DMRS symbol is omitted and the symbol length of the repetition 910-2 is 3.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • one additional DMRS is configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 2.
  • 2 repetitions may be associated with a same TCI state.
  • the total number of symbols for DMRS and data for the 2 repetitions may be 8.
  • repetitions 910-1 and 910-2 associated with TCI-A there are 4 symbols in each repetition, where the first symbol in the repetition 910-1 and the last symbol in the repetition 910-2 are used for DMRS transmission/reception, and the remaining symbols in the repetitions 910-1 and 910-2 are used for data transmission/reception.
  • the physical shared channel is a PDSCH
  • the resource mapping type is PDSCH mapping type A
  • one additional DMRS is configured for the PDSCH
  • the parameter dmrs-AdditionalPosition for PDSCH mapping type A is 3.
  • 2 repetitions may be associated with a same TCI state.
  • the total number of symbols for DMRS and data for the 2 repetitions may be 8.
  • repetitions 910-1 and 910-2 associated with TCI-A there are 4 symbols in each repetition, where the first symbol in the repetition 910-1 and the third symbol in the repetition 910-2 are used for DMRS transmission/reception, and the remaining symbols in the repetitions 910-1 and 910-2 are used for data transmission/reception.
  • the DMRS for the (n+1) -th repetition may be mapped on the second or third symbol within the repetition.
  • embodiments of the present disclosure provide a solution for DMRS transmission and reception in the Multi-TRP communication.
  • This solution disables DMRS transmission and reception in at least one of PDSCH or PUSCH repetitions.
  • this solution allows different resource patterns in different repetitions. Therefore, this solution can achieve better resource utilization.
  • the solution can achieve backward compatibility for the scheduling of PDSCH or PUSCH repetitions in the Multi-TRP communication, so as to achieve high performance.
  • FIG. 10 illustrates an example method 1000 in accordance with some embodiments of the present disclosure.
  • the method 1000 may be performed at the device 201 as shown in FIG. 2. It is to be understood that the method 1000 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the device 201 determines control information for scheduling a physical shared channel.
  • the control information indicates a plurality of TCI states to be used for communication with the device 202 over the physical shared channel.
  • the device 201 determines, from the plurality of transmission occasions, a set of transmission occasions associated with one TCI state of the plurality of TCI states.
  • the device 201 may determine the set of transmission occasions associated with the TCI state such that the set of transmission occasions are continuous in sub-slots or symbols.
  • the device 201 may determine the set of transmission occasions associated with the TCI state such that no transmission occasion associated with a further one of the plurality of TCI states is available between two adjacent transmission occasions in the set of transmission occasions.
  • the device 201 determines, for the set of transmission occasions, respective resource allocations for transmitting at least one DMRS of the physical shared channel to the device 202.
  • the device 201 may determine the resource allocations for the set of transmission occasions based on at least one of the following: the number of additional DMRSs configured for the physical shared channel; a slot format; the number of the plurality of transmission occasions; the number of symbols occupied by one of the plurality of transmission occasions; a resource mapping type of the physical shared channel; and one or more DMRS position parameters associated with the resource mapping type.
  • the device 201 may determine, for one transmission occasion of the set of transmission occasions, a resource allocation for DMRS transmission in the transmission occasion.
  • the resource allocation for the transmission occasion may indicate at least one of the following: the number of symbols to be used for the DMRS transmission in the transmission occasion; and respective positions of the symbols in a slot.
  • the set of transmission occasions comprise at least first and second transmission occasions.
  • the device 201 may determine a first resource allocation for DMRS transmission in the first transmission occasion and determine a second resource allocation for DMRS transmission in the second transmission occasion, where the second resource allocation is different from the first resource allocation.
  • the device 201 may determine the resource allocations for the set of transmission occasions such that DMRS transmission in at least one of the set of transmission occasions is disabled.
  • the device 201 transmits, based on the resource allocations and the TCI state, the at least one DMRS to the device 202 during the set of transmission occasions.
  • the device 201 is a terminal device
  • the device 202 is a network device serving the terminal device or a TRP coupled to the network device
  • the physical shared channel is a PUSCH.
  • the device 201 is a network device or a TRP coupled to the network device
  • the device 202 is a terminal device served by the network device
  • the physical shared channel is a PDSCH.
  • FIG. 11 illustrates an example method 1100 in accordance with some embodiments of the present disclosure.
  • the method 1100 may be performed at the device 202 as shown in FIG. 2. It is to be understood that the method 1100 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the device 202 determines control information for scheduling a physical shared channel.
  • the control information indicates a plurality of TCI states to be used for communication with the device 201 over the physical shared channel.
  • the device 202 determines, from the plurality of reception occasions, a set of reception occasions associated with one TCI state of the plurality of TCI states.
  • the device 202 may determine the set of reception occasions associated with the TCI state such that the set of reception occasions are continuous in sub-slots or symbols.
  • the device 202 may determine the set of reception occasions associated with the TCI state such that no reception occasion associated with a further one of the plurality of TCI states is available between two adjacent reception occasions in the set of reception occasions.
  • the device 202 determines, for the set of reception occasions, respective resource allocations for receiving at least one DMRS of the physical shared channel from the device 201.
  • the device 202 may determine the resource allocations for the set of reception occasions based on at least one of the following: the number of additional DMRSs configured for the physical shared channel; a slot format; the number of the plurality of reception occasions; the number of symbols occupied by one of the plurality of reception occasions; a resource mapping type of the physical shared channel; and one or more DMRS position parameters associated with the resource mapping type.
  • the device 202 may determine, for one reception occasion of the set of reception occasions, a resource allocation for DMRS reception in the reception occasion.
  • the resource allocation may indicate at least one of the following: the number of symbols to be used for the DMRS reception in the reception occasion; and respective positions of the symbols in a slot.
  • the plurality of reception occasions may comprise at least first and second reception occasions.
  • the device 202 may determine a first resource allocation for DMRS reception in the first reception occasion and determine a second resource allocation for DMRS reception in the second reception occasion, where the first resource allocation is different from the second resource allocation.
  • the device 202 may determine the resource allocations for the set of reception occasions such that DMRS reception in at least one of the set of reception occasions is disabled.
  • the device 202 receives, based on the resource allocations and the TCI state, the at least one DMRS from the device 201 during the set of reception occasions.
  • the device 202 is a network device or a TRP coupled to the network device
  • the first device 201 is a terminal device served by the network device
  • the physical shared channel is a PUSCH.
  • the device 202 is a terminal device
  • the device 201 is a network device serving the terminal device or a TRP coupled to the network device
  • the physical shared channel is a PDSCH.
  • FIG. 12 is a simplified block diagram of a device 1200 that is suitable for implementing embodiments of the present disclosure.
  • the device 1200 can be considered as a further example implementation of the network device 110, the TRP 120 or the terminal device 130 as shown in FIG. 1. Accordingly, the device 1200 can be implemented at or as at least a part of the network device 110, the TRP 120 or the terminal device 130.
  • the device 1200 includes a processor 1210, a memory 1220 coupled to the processor 1210, a suitable transmitter (TX) and receiver (RX) 1240 coupled to the processor 1210, and a communication interface coupled to the TX/RX 1240.
  • the memory 1210 stores at least a part of a program 1230.
  • the TX/RX 1240 is for bidirectional communications.
  • the TX/RX 1240 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the eNB, Un interface for communication between the eNB and a relay node (RN) , or Uu interface for communication between the eNB and a terminal device.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the eNB and a relay node (RN)
  • Uu interface for communication between the eNB and a terminal device.
  • the program 1230 is assumed to include program instructions that, when executed by the associated processor 1210, enable the device 1200 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGs. 1 to 11.
  • the embodiments herein may be implemented by computer software executable by the processor 1210 of the device 1200, or by hardware, or by a combination of software and hardware.
  • the processor 1210 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 1210 and memory 1220 may form processing means 1250 adapted to implement various embodiments of the present disclosure.
  • the memory 1220 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 1220 is shown in the device 1200, there may be several physically distinct memory modules in the device 1200.
  • the processor 1210 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 1200 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to FIGs. 6-7.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • machine readable storage medium More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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JP2021576914A JP7380719B2 (ja) 2019-06-25 2019-06-25 通信方法、通信デバイス、及びプログラム
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