WO2020118717A1 - Procédés, dispositifs et supports lisibles par ordinateur d'émission et de réception de ssb - Google Patents

Procédés, dispositifs et supports lisibles par ordinateur d'émission et de réception de ssb Download PDF

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Publication number
WO2020118717A1
WO2020118717A1 PCT/CN2018/121306 CN2018121306W WO2020118717A1 WO 2020118717 A1 WO2020118717 A1 WO 2020118717A1 CN 2018121306 W CN2018121306 W CN 2018121306W WO 2020118717 A1 WO2020118717 A1 WO 2020118717A1
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Prior art keywords
ssbs
ssb
candidate
transmitted
soft combination
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PCT/CN2018/121306
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English (en)
Inventor
Lin Liang
Gang Wang
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Nec Corporation
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Priority to PCT/CN2018/121306 priority Critical patent/WO2020118717A1/fr
Priority to CN201880100675.XA priority patent/CN113508626A/zh
Publication of WO2020118717A1 publication Critical patent/WO2020118717A1/fr

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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
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the non-limiting and exemplary embodiments of the present disclosure generally relate to the field of wireless communication techniques, and more particularly relate to methods, devices and computer readable medium for synchronization signal/Physical broadcast channel blocks (SSB) in a wireless communication system.
  • SSB synchronization signal/Physical broadcast channel blocks
  • New radio access system which is also called as NR system or NR network
  • NR system is the next generation communication system.
  • RAN Radio Access Network
  • 3GPP Third Generation Partnership Project
  • the NR system will consider frequency ranging up to 100Ghz with an object of a single technical framework addressing all usage scenarios, requirements and deployment scenarios defined in Technical Report TR 38.913, which includes requirements such as enhanced mobile broadband, massive machine-type communications, and ultra-reliable and low latency communications.
  • LTE Long Term Evolution
  • LAA License Assisted Access
  • reference signals and system information shall be broadcast to a terminal device such as User Equipment (UE) .
  • UE User Equipment
  • these signals are combined together, generating synchronization signal (SS) /Physical broadcast channel (PBCH) block, which is also called as SSB for short.
  • SSB assumes a period of 20ms for UE signal detection and at the same time, soft combination is used among SSBs of the same index within 80ms so as to improve detection point.
  • the period of SBs will be larger than 20ms to avoid accessing the channel frequently.
  • a Listen Before Talk (LBT) operation shall be performed before transmission to check whether the channel is clear.
  • LBT Listen Before Talk
  • it seems beneficial for the LBT operation ifmore candidate SSBs could be used within the SSB transmission window.
  • this kind of SSBs is called as Discovery Reference signal and the window in which DRS could be transmitted is called as DRS measurement time configuration.
  • example embodiments of the present disclosure provide new solutions for uplink resource mapping in a wireless communication system.
  • a method for transmitting synchronization signal/physical broadcast channel blocks (SSBs) of a discovery reference signal comprising, at a network device, generating a scrambling sequence for the SSBs based on a candidate SSB position group in which the SSBs are to be transmitted and scrambling at least a part of the SSBs with the generated scrambling sequence.
  • a method for receiving SSBs of a discovery reference signal comprising, at a terminal device, receiving the SSBs in the plurality of continuous candidate SSB position groups; obtaining information on SSB index contained within demodulation reference signal (DMRS) in a physical broadcast channel of each of the SSBs; and performing descrambling and soft combination on the received SSB based on the information on SSB index.
  • DMRS demodulation reference signal
  • the network device may comprise at least one processor and at least one memory coupled with the at least one processor.
  • the at least one memory has computer program codes therein, which are configured to, when executed on the at least one processor, cause the network device at least to perform actions of the method as provided in the first aspect.
  • a terminal device may comprise at least one processor and at least one memory coupled with the at least one processor.
  • the at least one memory has computer program codes therein, which are configured to, when executed on the at least one processor, cause the terminal device at least to perform actions of the method as provided in the second aspect.
  • a computer-readable storage medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to perform actions in the method according to any embodiment in the first aspect.
  • a computer-readable storage medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to perform actions in the method according to any embodiment in the second aspect.
  • a computer program product comprising a computer-readable storage medium according to the fifth aspect.
  • a computer program product comprising a computer-readable storage medium according to the sixth aspect.
  • Fig. 1 illustrates candidate SSB position configuration for FRI in NR system
  • Fig. 2 illustrates three alternatives solutions for SSB transmission after LBT in the prior art
  • Fig. 3 schematically illustrates a flow chart of a method for transmitting SSBs in a wireless communication system according to some embodiments of the present disclosure
  • Fig. 4 schematically illustrates example candidate SSB position groups according to some embodiments of the present disclosure
  • Figs. 5A and 5B schematically illustrate two example SSB transmission cases according to some embodiments of the present disclosure
  • Fig. 6 schematically illustrates a flow chart of another method for transmitting SSBs in a wireless communication system according to some embodiments of the present disclosure
  • Fig. 7 schematically illustrates pluses of synchronization signals in ideal conditions and actual conditions
  • Figs. 8A and 8B illustrate example cover codes for Primary Synchronization Signal (PSS) /secondary Synchronization Signal (SSS) according to an embodiment of the present disclosure.
  • PSS Primary Synchronization Signal
  • SSS secondary Synchronization Signal
  • Fig. 9 schematically illustrates a flow chart of a method for receiving SSBs in a wireless communication system according to some embodiments of the present disclosure
  • Fig. 10 schematically illustrates a flow chart of another method for receiving SSBs in a wireless communication system according to some embodiments of the present disclosure
  • Fig. 11 schematically illustrates a block diagram of an apparatus for transmitting SSBs in a wireless communication system according to some embodiments of the present disclosure
  • Fig. 12 schematically illustrates a block diagram of another apparatus for transmitting SSBs in a wireless communication system according to some embodiments of the present disclosure
  • Fig. 13 schematically illustrates a block diagram of an apparatus for receiving SSBs in a wireless communication system according to some embodiments of the present disclosure
  • Fig. 14 schematically illustrates a block diagram of another apparatus for receiving SSBs in a wireless communication system according to some embodiments of the present disclosure.
  • Fig. 15 schematically illustrates a simplified block diagram of an apparatus 1510 that may be embodied as or comprised in a terminal device like UE, and an apparatus 1520 that may be embodied as or comprised in a network device like gNB as described herein.
  • each block in the flowcharts or blocks may represent a module, a program, or a part of code, which contains one or more executable instructions for performing specified logic functions, and in the present disclosure, a dispensable block is illustrated in a dotted line.
  • these blocks are illustrated in particular sequences for performing the steps of the methods, as a matter of fact, they may not necessarily be performed strictly according to the illustrated sequence. For example, they might be performed in reverse sequence or simultaneously, which is dependent on natures of respective operations.
  • block diagrams and/or each block in the flowcharts and a combination of thereof may be implemented by a dedicated hardware-based system for performing specified functions/operations or by a combination of dedicated hardware and computer instructions.
  • references in the specification to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • wireless communication network refers to a network following any suitable wireless communication standards, such as New Radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , and so on.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • wireless communication network may also be referred to as a “wireless communication system.
  • communications between network devices, between a network device and a terminal device, or between terminal devices in the wireless communication network may be performed according to any suitable communication protocol, including, but not limited to, Global System for Mobile Communications (GSM) , Universal Mobile Telecommunications System (UMTS) , Long Term Evolution (LTE) , New Radio (NR) , wireless local area network (WLAN) standards, such as the IEEE 802.11 standards, and/or any other appropriate wireless communication standard either currently known or to be developed in the future.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • NR New Radio
  • WLAN wireless local area network
  • IEEE 802.11 any other appropriate wireless communication standard either currently known or to be developed in the future.
  • the term “network device” refers to a node in a wireless communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • RRU Remote Radio Unit
  • RH radio header
  • terminal device refers to any end device that may be capable of wireless communications.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) and the like.
  • the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
  • a terminal device may represent a machine or other device that performs monitoring and/or measurements, and transmits the results of such monitoring and/or measurements to another terminal device and/or network equipment.
  • the terminal device may in this case be a machine-to-machine (M2M) device, which may in a 3GPP context be referred to as a machine-type communication (MTC) device.
  • M2M machine-to-machine
  • MTC machine-type communication
  • the terminal device may be a UE implementing the 3GPP narrow band internet of things (NB-IoT) standard. Examples of such machines or devices are sensors, metering devices such as power meters, industrial machinery, or home or personal appliances, for example refrigerators, televisions, personal wearables such as watches etc.
  • a terminal device may represent a vehicle or other equipment that is capable of monitoring and/or reporting on its operational status or other functions associated with its operation.
  • a downlink (DL) transmission refers to a transmission from a network device to UE
  • an uplink (UL) transmission refers to a transmission in an opposite direction.
  • Fig. 1 illustrates SSB candidate position configuration for FR1 in the NR system. As illustrated in Fig. 1, within one DRS measurement time configuration, 8 candidate SSB positions SSB 0 to SSB 7 are configured.
  • SSB index 6 bits are used to indicate an index of SSB (hereinafter also referred to as an SSB index) .
  • Three bits can be carried by DeModulation Reference Signal (DMRS) implicitly and other three bits can be carried by MIB explicitly.
  • DMRS DeModulation Reference Signal
  • the period of SSB will be much larger than 20ms to avoid accessing the channel frequently and it could be for example 80ms, 160ms, or even longer.
  • the SSB cannot be transmitted at expected time.
  • it will be beneficial to use more SSBs within one DRS measurement time configuration.
  • ⁇ FFS How to derive frame timing from detected SS/PBCH block
  • ⁇ FFS Shift granularity between candidate SSBs positions/candidate groups of SSBs
  • ⁇ FFS Duration of the transmitted DRS within the window, including SSBs and other multiplexed signals/channels
  • ⁇ FFS relationship between transmitted SSB index and quasi-colocated (QCL) assumption at UE
  • ⁇ FFS If and how to support beam repetition for soft combining of SSBs within the same DRS transmission.
  • Fig. 2 illustrates diagram of alternative solution as proposed in R1-1813906.
  • the SSB transmission starts from SSB0 which should be first transmitted at the expected time, i.e., the SSB transmission is shifted to the transmission instance after the channel is available.
  • IE PBCH information element
  • the SSB transmission is performed by cyclically wrapping around the SSB (s) dropped due to LBT failure till the end of the burst set transmission.
  • the SSB transmission starts from SSB0 which shall be first transmitted at the expected time, which is similar to Alt-l, but, in Alt-3, beams for SSB transmission can be shifted together with the SSB and thus the network could flexibly position SSB index. In such a case, it is still required to inform UE of time offset of SSB0 as well.
  • the UE determines the relation between transmitted SS/PBCH block index and QCL assumptions using an effective SS/PBCH block index given by the detected SS/PBCH index modulo N.
  • larger specification impacts can be foreseen and it is also unclear how the UE would derive the frame timing in such a scheme.
  • embodiments of the present disclosure provide a solution for transmitting and receiving SSBs to enable soft combination within the same DRS transmission.
  • SSBs for soft combination can be transmitted within any of a plurality of continuous candidate SSB position groups and preferably transmitted in continuous transmission resources.
  • each of SSBs can be scrambled based on which candidate SSB position group the SSB is to be transmitted; and accordingly at a terminal device, the soft combination can be performed based on information on SSB index contained within DMRS in PBCH.
  • the soft combination can be performed first and the descrambling can be directly performed with scrambling sequences corresponding to information on SSB index decoded from master information block of the SSBs. Otherwise, the scrambling operation can be performed first by making descrambling attempts with potential scrambling sequences and then the soft combination is performed on the descrambled SSB. By this means, it is possible to benefit from soft combination even if the period of SSB is larger than that in the NR system.
  • Fig. 3 schematically illustrates a flow chart of a method for transmitting SSB according to some embodiments of the present disclosure.
  • the method 300 can be implemented at a network device like gNB or any other network device.
  • the network device may generate a scrambling sequence for the SSBs based on a candidate SSB position group in which the SSBs are to be transmitted.
  • the SSBs included in one DRS can be transmitted within any of a plurality of continuous candidate SSB position groups.
  • an SSB means a transmission block carrying synchronization signals and PBCH;
  • a candidate SSB position means a time-frequency transmission resource on which an SSB may be transmitted.
  • 64 will be taken an example of Y to describe the embodiment of the present disclosure but it is to be noted that the present disclosure is not limited thereto.
  • Y candidate position for SSB transmission it is possible to divide Y candidate position for SSB transmission to a plurality of candidate position groups. For example, for 64 candidate SSB positions, they can be divided into 8 candidate position groups Group 0 to Group 7, each contain 8 candidate positions, as illustrated in Fig. 4A. It shall be appreciated that “continuous” used herein does not mean these candidate positions are continuous in transmission resource but means these candidate SSB positions have continuous index of SSB and they are all used for the same one DRS transmission within one predetermined transmission time interval (80ms for example) .
  • a scrambling sequence is generated for each of the candidate SSB position group. This means all candidate SSB positions in the same group will share the same scrambling sequence and difference candidate SSB position groups can use different scrambling sequences.
  • the SSBs for soft combination will be transmitted in continuous candidate SSB positions once the channel is available.
  • the SSBs might be transmitted in the same candidate SSB group (as illustrated in Fig. 5A) and thus, all SSBs share the same scrambling sequence.
  • the SSBs might also be transmitted in the two continuous candidate SSB groups (as illustrated in Fig. 5B) . For example, a first part of the SSBs are to be transmitted in a first candidate SSB position group and a second part of the SSBs are to be transmitted in a second candidate SSB position group adjacent to the first candidate SSB position group.
  • two scrambling sequences may be generated respectively for the first part of the SSBs and the second part of the SSBs based on the first candidate SSB position group and the second candidate SSB position group.
  • adjacent used herein does not mean these candidate positions are directly adjacent in transmission resource but means the two candidate SSB position group have continuous index of Candidate SSB positions and there is no any other Candidate SSB position group therebetween.
  • each of candidate SSB position groups can be indicated by SSB position group information contained within master information block of a physical broadcast channel and the generating a scrambling sequence can be performed based on the SSB position group information.
  • bits are used to indicate the SSB index, i.e., an index of a candidate SSB position carrying an SSB.
  • Three bits are carried by DMRS and other three bits are carried by MIB explicitly.
  • Bits (e.g. 3 bits for 64 candidate positions) carried by DMRS are used to indicate an index of candidate SSB position within a candidate SSB position group and bits (e.g. 3 bits for 64 candidate positions) carried by MIB could be used as the SSB position group information to indicate an index of candidate SSB position group carrying one or more SSBs.
  • the scrambling sequences can be generated based on three bits carried by MIB, i.e. the fourth, the fifth and the sixth bits of the SSB index.
  • the scrambling sequence s (i) can be defined by
  • c is a pseudo-random sequence of length M PN , c may be defined by
  • x 1 (n+ 31) (x 1 (n + 3) + x 1 (n) ) mod 2
  • x 2 (n + 31) (x 2 (n + 3) + x 2 (n + 2) + x 2 (n + 1) + x 2 (n) ) mod 2
  • the initialization of the second m-sequence x 2 (n) is denoted by with the value depending on the application of the sequence.
  • step 320 the network device scrambles SSBs with the generated scrambling sequence.
  • an SSB position configuration can be used to indicate a predetermined position range in which SSB and Physical Downlink Shared Channel (PDSCH) can be transmitted simultaneously.
  • PDSCH scheduled by C-RNTI would be rate matched according to the SSB position configuration. Beyond the position range, only SSB or PBCH can be transmitted.
  • Fig. 6 illustrates a flow chart of transmitting SSBs according to some embodiments of the present disclosure.
  • the method 600 can be implemented at a network device like gNB or any other network device.
  • the network device transmits an SSB position configuration indicating a predetermined position range in which SSBs and downlink shared channel could be transmitted simultaneously.
  • This case means that there are at most 64 candidate SSB positions for one DRS transmission; at most 8 SSB will be transmitted within one DRS transmission window; and within the first 16 candidate position, SSBs and PDSCHs can be transmitted simultaneously and PDSCH scheduled by C-RNTI would be rate matched at the 16 candidate positions. While for the other candidate SSB positions (SSB 16 to SSB 63) , only one of SSB and PDSCH can be allowed to be transmitted.
  • the parameter ssb-PositionsInBurst can be a higher layer parameter, which may have a bitmap in group and a bitmap between groups.
  • the bit length of bitmap between groups determines the value of Z, and the first Z SSBs in Y candidate SSB positions are positions within the position range indicated by ssb-PositionsInBurst.
  • the network device can configure the UE, by the higher layer parameter ssb-PositionsInBurst in SystemInformationBlockType1, indexes of the SS/PBCH blocks for which the UE does not receive other signals or channels in REs that overlap with REs corresponding to the SS/PBCH blocks.
  • the network device can configure the UE per serving cell, by a higher layer parameter ssb-PositionsInBurst in ServingCellConfigCommon, indexes of the SS/PBCH blocks for which the UE does not receive other signals or channels in REs that overlap with REs corresponding to the SS/PBCH blocks.
  • a UE expects a configuration provided by ssb-PositionsInBurst in ServingCellConfigCommon to be same as a configuration provided by ssb-PositionsInBurst in SystemInformationBlockType1.
  • a UE can be provided per serving cell by higher layer parameter ssb-periodicityServingCell a periodicity of the half frames for reception of the SS/PBCH blocks for the serving cell.
  • the predetermined position range may be configured by the network device through a higher layer like ssb-PositionsInBurst, the present disclosure is not limited thereto. In some embodiment of the present disclosure, it can also be a default value which is known by both the network device and the terminal device.
  • the network device transmits the SSBs and the downlink shared channel simultaneously within the predetermined position range within the plurality of continuous candidate SSB position groups.
  • the network device transmits only one of the SSBs and the downlink shared channel.
  • a cover code can be used to scramble the transmitted PSS/SSS.
  • Fig. 7A illustrates the detection power of primary synchronization signals without cover code in ideal conditions. Under ideal conditions, the pulse with the maximum amplitude will be detected as the timing of primary synchronization signal. However, in actual conditions, there are usually noises overlapped on the signals, the largest pulse and the second largest pulse in Fig. 7A might be approximate, and thus the actual pulse might be wrongly detected under noise.
  • a cover code in order to improve symbol level estimation accuracy, can be scrambled in the transmitted PSS/SSS.
  • Fig. 7B illustrates the power detection of primary synchronization signals with cover code. As the gap between the largest and the second largest pulse is larger than that in Fig. 7A, the timing detection accuracy will be much better improved.
  • the lth transmitted PSS d l PSS (n) S (l) .
  • d PSS (n) S (l) .
  • S (l) is defined one of row in table as illustrated in Fig. 8A.
  • the cover code illustrated in Fig. 8B could be used to have a better system performance.
  • other cover code like [1 1 -1 1 -1 1 1] or [1 1 1 -1 1 -1 1] or [1 1 1 1 1 -1 -1 1 -1] can also be used to achieve better system performance.
  • a cover code for N-SSB soft combination may have a subsequence similar to a cover code for M-SSB soft combination, wherein N and M indicates the number of SSBs for soft combination and N is a multiple of M.
  • the cover code could use a nested structure, which means 4-SSB soft combination could be the first 4 codes or the odd sequence of cover code for 8-SSB soft combination.
  • cover code is [1 1]
  • 4-SSB combination cover code is [1 1 -1 1] or [1 1 1 1 -1] .
  • the cover code By means of the cover code, it could reduce the influence of noises on the synchronization signals since it does not require multiple PBCH decoding attempts which are usually needed for the synchronization signal without the cover code. Thus, and the detection complexity could be reduced.
  • the SSB in a case that the channel is not available from the start of DRS transmission window, the SSB could be shifted to transmission instances right after the LBT succeeds.
  • a shift granularity of 0.5ms can be used to reduce hypothesis detection of cyclic prefix (CP) length since for different CP lengths at boundary 0.5ms might be different and it might cause addition difficulties for soft combination.
  • CP cyclic prefix
  • Fig. 9 illustrates a method for receiving SSBs according to embodiments of the present disclosure.
  • the method 900 can be implemented at a terminal device like UE or any other terminal device.
  • the terminal device first receives SSBS in the plurality of continuous candidate SSB position groups.
  • the SSBs can be received within any of a plurality of continuous candidate SSB position groups. In other words, these SSB are received within one DRS transmission window.
  • the terminal device obtains information on SSB index contained within demodulation reference signal (DMRS) in a physical broadcast channel of each of the SSBs.
  • the information on SSB index contained within demodulation reference signal (DMRS) can indicate the position of SSB within one candidate SSB position group. Based on these positions of SSBs, the terminal device could learn whether all SSBs are transmitted in the same candidate SSB position group. For example, for the case as illustrated in Figs. 5A, the information on SSB index contained within DMRS will indicate that the indices of the SSBs are 2, 3, 4 and 5 respectively. From this information, the terminal device could know they are located within the same candidate SSB group since there are continuous.
  • DMRS demodulation reference signal
  • the information on SSB index contained within DMRS will indicate that the indices of the SSBs are 6, 7, 0 and 1 respectively. From this information, the terminal device could determine that these SSB are located within different candidate SSB groups since theses number of positions are not continuous.
  • step 930 descrambling and soft combination are performed on the received SSB based on the information on SSB index.
  • the information on SSB index indicates the SSBs are transmitted respectively within two adjacent candidate position groups.
  • MIB of the PBCH of the received SSBs will carry different information on SSB index and thus descrambling could be implemented first.
  • the performing scrambling and soft combination may comprise: descrambling the SSBs with potential scrambling sequences and then performing soft combination on the descrambled SSBs.
  • the information on SSB index indicates the SSBs are transmitted within one candidate position group.
  • the MIB of PBCH of the received SSBs will carry the same information on SSB index and thus the soft combination could be performed first. Therefore, the MIB of PBCH could be obtained through soft combination and then a scrambling sequence corresponding to the decoded information on SSB index can be used to scrambling the SSB.
  • the performing scrambling and soft combination may comprises performing soft combination on the received SSBs; and descrambling the combined SSBs with scrambling sequences corresponding to information on SSB index decoded from MIB of the SSBs.
  • Fig. 10 illustrates a flow chart of SSB receiving according to some embodiments of the present disclosure.
  • the method 1000 can be implemented at a terminal device like UE or any other terminal device.
  • the terminal device receives an SSB position configuration indicating a predetermined position range in which SSBs and downlink shared channel could be transmitted simultaneously.
  • the SSB position configuration can be carried by a higher signaling ssb-PositionsInBurst.
  • the terminal device could learn a predetermined position range in which simultaneous transmission of SSB and PDSCH is allowable.
  • step 1020 the terminal device receives the SSBs and the downlink shared channel simultaneously within the predetermined position range within the plurality of continuous candidate SSB position group.
  • step 1030 receiving only one of the SSBs and the downlink shared channel in other candidate SSB positions outside the predetermined position range within the plurality of continuous candidate SSB position groups.
  • the terminal device could descramble synchronization signals within the SSBs with potential cover codes.
  • decoding efficiency could be improved without multiple decoding attempts.
  • potential cover codes for N-SSB soft combination may have subsequence similar to cover codes for M-SSB soft combination, wherein N and M indicates the number of SSBs for soft combination and N is a multiple of M.
  • N and M indicates the number of SSBs for soft combination and N is a multiple of M.
  • DRS signals have a longer period and thus some enhancement can be performed. Due to the longer period, some bits in frame field might not carry useful information and thud it is possible to use predefined PBCH bits to improve decoding performance. For example, the UE could assume that the least significant n bit is 0 in frame field, wherein n is typical 2, 3, 4. Meanwhile, UE could also assume that half frame bit in MIB is zero. In such a way, these bits are not required to be decoded and thus decoding performance can be improved. In other words, for PBCH transmitting on unlicensed band without soft combination, the UE assumes the 4 th , 3 rd , 2 nd , and 1 st LSB of SFN and the half radio frame bits are 0.
  • Fig. 11 schematically illustrates a block diagram of an apparatus for transmitting SSBs in a wireless communication system according to some embodiments of the present disclosure.
  • the apparatus 1100 can be implemented at a network device like gNB or any other network device.
  • the apparatus 1100 may include a sequence generating module 1110 and a scrambling module 1120.
  • the sequence generating module 1110 may be configured to generate a scrambling sequence for the SSBs based on a candidate SSB position group in which the SSBs are to be transmitted; a scrambling module 1120 may be configured to scramble at least a part of the SSBs with the generated scrambling sequence.
  • the SSBs can be transmitted within any of a plurality of continuous candidate SSB position groups within a DRS transmission window.
  • a first part of the SSBs can be transmitted in a first candidate SSB position group and a second part of the SSBs can be transmitted in a second candidate SSB position group adjacent to the first candidate SSB position group.
  • the generating a scrambling sequence may comprise generating two scrambling sequences respectively for the first part of the SSBs and the second part of the SSBs based on the first candidate SSB position group and the second candidate SSB position group.
  • each of the plurality of continuous candidate SSB position groups may be indicated by SSB position group information contained within master information block of a physical broadcast channel, and wherein the generating a scrambling sequence may be performed based on the SSB position group information.
  • the SSB position group information indicates the fourth, the fifth and the sixth bits of the SSB index.
  • Fig. 12 schematically illustrates a block diagram of an apparatus for transmitting SSBs in a wireless communication system according to some embodiments of the present disclosure.
  • the apparatus 1200 can be implemented at a network device like gNB or any other network device.
  • apparatus 1200 may include a configuration transmission module 1210.
  • the configuration transmission module 1210 may be configured to transmit an SSB position configuration indicating a predetermined position range in which SSBs and downlink shared channel could be transmitted simultaneously.
  • apparatus 1200 may further include an SSB/PDSCH transmission module t220.
  • the SSB/PDSCH transmission module 1220 may be configured to transmit the SSBs and the downlink shared channel simultaneously within the predetermined position range within the plurality of continuous candidate SSB position groups.
  • the SSB/PDSCH transmission module 1220 may additionally or alternatively configured to transmit only one of the SSBs and the downlink shared channel in other candidate SSB positions outside the predetermined position range within the plurality of continuous candidate SSB position groups.
  • an apparatus for transmitting SSBs in a wireless communication system may further comprise an SS scrambling module which can be configured to scramble synchronization signals within the SSBs by a cover code.
  • a cover code for N-SSB soft combination may have a subsequence similar to a cover code for M-SSB soft combination, wherein N and M indicates the number of SSBs for soft combination and N is a multiple of M.
  • Fig 13 schematically illustrates a block diagram of an apparatus 1300 for receiving SSBs in a wireless communication system according to some embodiments of the present disclosure.
  • the apparatus 1300 can be implemented at a terminal device such as UE or any other terminal device.
  • the apparatus 1300 may include an SSB reception module 1310, an information obtainment module 1320 and a descrambling/soft combination model 1330.
  • the SSB reception module 1310 may be configured to receive the SSBs in the plurality of continuous candidate SSB position groups.
  • the information obtainment module 1320 may be configured to obtain information on SSB index contained within demodulation reference signal (DMRS) in a physical broadcast channel of each of the SSBs.
  • DMRS demodulation reference signal
  • the descrambling/soft combination model 1330 may be configured to perform descrambling and soft combination on the received SSB based on the information on SSB index.
  • the SSBs can be received within any of a plurality of continuous candidate SSB position groups within a DRS transmission window.
  • the information on SSB index indicates that the SSBs can be transmitted respectively within two adjacent candidate position groups and the performing scrambling and soft combination may comprise descrambling the SSBs with potential scrambling sequences; and performing soft combination on the descrambled SSBs.
  • the information on SSB index indicates the SSBs are transmitted within one candidate position group and the performing scrambling and soft combination comprises performing soft combination on the received SSBs; and descrambling the combined SSBs with scrambling sequences corresponding to information on SSB index decoded from MIB of the SSBs.
  • the information on SSB index contained within the DMRS may indicate the first, second and the third bits of SSB index.
  • Fig 14 schematically illustrates a block diagram of an apparatus 1400 for receiving SSBs in a wireless communication system according to some embodiments of the present disclosure.
  • the apparatus 1400 can be implemented at a terminal device such as UE or any other terminal device.
  • apparatus 1400 may include a configuration reception module 1410.
  • the configuration reception module 1410 may configured to receive an SSB position configuration indicating a predetermined position range in which SSBs and downlink shared channel could be transmitted simultaneously.
  • apparatus 1400 may further include an SSB/PDSCH reception module 1420.
  • the SSB/PDSCH reception module 1420 may be configured to receive the SSBs and the downlink shared channel simultaneously within the predetermined position range within the plurality of continuous candidate SSB position group.
  • the SSB/PDSCH reception module 1420 may be additionally or alternatively configured to receive only one of the SSBs and the downlink shared channel in other candidate SSB positions outside the predetermined position range within the plurality of continuous candidate SSB position groups.
  • the apparatus can be implemented at a terminal device such as UE or any other terminal device.
  • the apparatus may include an SSB descrambling module configured to descramble synchronization signals within the SSBs with potential cover codes.
  • potential cover codes for N-SSB soft combination may have subsequence similar to cover codes for M-SSB soft combination, wherein N and M indicates the number of SSBs for soft combination and N is a multiple of M.
  • apparatuses provided herein are described with reference to Figs. 11 to 14 in brief. It can be noticed that the apparatuses may be configured to implement functionalities as described with reference to Figs. 3 to 10. Therefore, for details about the operations of modules in these apparatuses, one may refer to those descriptions made with respect to the respective steps of the methods with reference to Figs. 3 to 10.
  • components of the apparatuses may be embodied in hardware, software, firmware, and/or any combination thereof.
  • the components of apparatuses may be respectively implemented by a circuit, a processor or any other appropriate selection device.
  • apparatuses may include at least one processor.
  • the at least one processor suitable for use with embodiments of the present disclosure may include, by way of example, both general and special purpose processors already known or developed in the future.
  • Apparatuses may further include at least one memory.
  • the at least one memory may include, for example, semiconductor memory devices, e.g., RAM, ROM, EPROM, EEPROM, and flash memory devices.
  • the at least one memory may be used to store program of computer executable instructions.
  • the program can be written in any high-level and/or low-level compliable or interpretable programming languages.
  • the computer executable instructions may be configured, with the at least one processor, to cause apparatuses to at least perform operations according to the method as discussed with reference to Figs. 3 to 10 respectively.
  • FIG. 15 schematically illustrates a simplified block diagram of an apparatus 1510 that may be embodied as or comprised in a terminal device like UE, and an apparatus 1520 that may be embodied as or comprised in a network device like gNB as described herein.
  • the apparatus 1510 comprises at least one processor 1511, such as a data processor (DP) and at least one memory (MEM) 1512 coupled to the processor 1511.
  • the apparatus 1510 may further include a transmitter TX and receiver RX 1513 coupled to the processor 1511, which may be operable to communicatively connect to the apparatus 1520.
  • the MEM 1512 stores a program (PROG) 1514.
  • the PROG 1514 may include instructions that, when executed on the associated processor 1511, enable the apparatus 1510 to operate in accordance with embodiments of the present disclosure, for example methods 900, 1000.
  • a combination of the at least one processor 1511 and the at least one MEM 1512 may form processing means 1515 adapted to implement various embodiments of the present disclosure.
  • the apparatus 1520 comprises at least one processor 1521, such as a DP, and at least one MEM 1522 coupled to the processor 1521.
  • the apparatus 1520 may further include a suitable TX/RX 1523 coupled to the processor 1521, which may be operable for wireless communication with the apparatus 1510.
  • the MEM 1522 stores a PROG 1524.
  • the PROG 1524 may include instructions that, when executed on the associated processor 1521, enable the apparatus 1520 to operate actions at the network device in accordance with the embodiments of the present disclosure, for example methods 300, 600.
  • a combination of the at least one processor 1521 and the at least one MEM 1522 may form processing means 1525 adapted to implement various embodiments of the present disclosure.
  • Various embodiments of the present disclosure may be implemented by computer program executable by one or more of the processors 1511, 1521, software, firmware, hardware or in a combination thereof.
  • the MEMs 1512 and 1522 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples.
  • the processors 1511 and 1521 may be of any type suitable to the local technical environment, 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 present disclosure may also provide a carrier containing the computer program as mentioned above, wherein the carrier is one of an electronic signal, optical signal, radio signal, or computer readable storage medium.
  • the computer readable storage medium can be, for example, an optical compact disk or an electronic memory device like a RAM (random access memory) , a ROM (read only memory) , Flash memory, magnetic tape, CD-ROM, DVD, Blue-ray disc and the like.
  • an apparatus implementing one or more functions of a corresponding apparatus described with an embodiment comprises not only prior art means, but also means for implementing the one or more functions of the corresponding apparatus described with the embodiment and it may comprise separate means for each separate function, or means that may be configured to perform two or more functions.
  • these techniques may be implemented in hardware (one or more apparatuses) , firmware (one or more apparatuses) , software (one or more modules) , or combinations thereof.
  • firmware or software implementation may be made through modules (e.g., procedures, functions, and so on) that perform the functions described herein.

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  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé d'émission et de réception de SSB. Le procédé d'émission de SSB est réalisé au niveau d'un dispositif de réseau, les SSB pouvant être émises à l'intérieur d'un groupe quelconque d'une pluralité de groupes continus de positions candidates de SSB. Selon le procédé, une séquence d'embrouillage est générée pour les SSB d'après un groupe de positions candidates de SSB dans lequel les SSB doivent être émises et au moins une partie des SSB est embrouillée avec la séquence d'embrouillage générée.
PCT/CN2018/121306 2018-12-14 2018-12-14 Procédés, dispositifs et supports lisibles par ordinateur d'émission et de réception de ssb WO2020118717A1 (fr)

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CN201880100675.XA CN113508626A (zh) 2018-12-14 2018-12-14 用于ssb传输和接收的方法、设备和计算机可读介质

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