WO2022250473A1 - Method and base station for communication in a high frequency network - Google Patents
Method and base station for communication in a high frequency network Download PDFInfo
- Publication number
- WO2022250473A1 WO2022250473A1 PCT/KR2022/007491 KR2022007491W WO2022250473A1 WO 2022250473 A1 WO2022250473 A1 WO 2022250473A1 KR 2022007491 W KR2022007491 W KR 2022007491W WO 2022250473 A1 WO2022250473 A1 WO 2022250473A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- beams
- beamwidth
- base station
- rach
- path loss
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 87
- 238000004891 communication Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 29
- 238000011084 recovery Methods 0.000 claims description 14
- 230000015654 memory Effects 0.000 claims description 12
- 238000012163 sequencing technique Methods 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 8
- 235000019527 sweetened beverage Nutrition 0.000 description 23
- 230000008569 process Effects 0.000 description 14
- 238000013468 resource allocation Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 101100274486 Mus musculus Cited2 gene Proteins 0.000 description 1
- 101100533725 Mus musculus Smr3a gene Proteins 0.000 description 1
- 101150096310 SIB1 gene Proteins 0.000 description 1
- 101150096622 Smr2 gene Proteins 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Definitions
- the disclosure relates to a method and a base station for communication in a high frequency network.
- Terahertz (THz) communication frequency ranges from 0.1 THz to 10 THz.
- the THz communication has abundant usable bandwidth of tens of Gigahertz (GHz) compared to GHz available below 200GHz frequency or mmWave and sub-6 GHz.
- GHz gigahertz
- FIG. 1 illustrates a graphical representation of path loss in THz communication, according to the related art.
- THz frequency range comprises both spreading and the absorption losses.
- THz experiences absorption noise unlike mmWave, which becomes severe at certain frequencies causing spikes in the observed path loss and also becomes significant with increasing distance.
- THz communication operates in high frequency range and suffers path loss
- highly directive antennas and massive antenna array techniques are required in THz to compensate for the absorption losses and to enhance the outdoor coverage.
- antenna sizes can go down to miniature size supporting nano devices as well.
- massive antenna arrays can be made feasible in the commercially deployed user equipment (UE) as well with small size antennas supporting narrower and energy efficient beamwidths compared to mmWave.
- UE user equipment
- narrower beams the number of beams at the transmitter and receiver are increased, which makes an exhaustive list of beams for searching, alignment and pairing between transmit and receiver beams.
- beamwidths in THz can be very narrow and energy efficient because of the increased number of antennas, possible to incorporate in THz systems.
- the number of beams required to cover specific area is quite high, making it an exhaustive list of beams for refinement and management procedures.
- an aspect of the disclosure is to provide a method and a system for communication in a high frequency network base station.
- a method for communication by a base station in a high frequency network includes generating a first beam having a first beamwidth in a first area of a cell, determining a plurality of second beamwidth levels for a plurality of second beams possible in the first beamwidth of the first beam, wherein a second beamwidth associated with each of the plurality of second beams is narrower than the first beamwidth, generating the plurality of second beams having the determined plurality of second beamwidth levels, and transmitting at least one synchronization message to a plurality of user equipments via the first beam and the plurality of second beams.
- a base station for communication in a high frequency network includes a memory and a processor coupled to the memory.
- the processor is configured to generate a first beam having a first beamwidth in a first area of a cell, determine a plurality of second beamwidth levels for a plurality of second beams possible in the first beamwidth of the first beam, wherein a second beamwidth associated with each of the plurality of second beams is narrower than the first beamwidth, generate the plurality of second beams having the determined plurality of second beamwidth levels, and transmit at least one synchronization message to a plurality of user equipment via the first beam and the plurality of second beams.
- FIG. 1 illustrates a graphical representation of path loss in THz communication, according to the related art
- FIG. 2 illustrates a flow diagram depicting a method for communication in a high frequency network base station, according to an embodiment of the disclosure
- FIG. 3 illustrates multiplexing of the first beam and second beams in frequency domain, according to an embodiment of the disclosure
- FIG. 4 illustrates multiplexing of the first beam and second beams in time domain, according to an embodiment of the disclosure
- FIG. 5 illustrates multiplexing of the first beam and second beams in time domain, according to an embodiment of the disclosure
- FIG. 6 illustrates hierarchical beam sequencing, according to an embodiment of the disclosure
- FIGS. 7A and 7B illustrate pictorial representation of combining beams of different beamwidths, according to various embodiments of the disclosure
- FIG. 8 illustrates transmission of synchronization signal block (SSB) with first beam and second beams, according to an embodiment of the disclosure
- FIGS. 9A and 9B illustrate initial acquisition with suitable SSB beam widths, according to various embodiments of the disclosure.
- FIG. 10 illustrates a flow chart depicting a process for initial random access channel (RACH) procedure in THz, according to an embodiment of the disclosure
- FIG. 11 illustrates a graphical representation of path loss at certain frequencies with increasing distance in THZ, according to an embodiment of the disclosure
- FIG. 12 illustrates a flow chart depicting a process for resource allocation in THz, according to an embodiment of the disclosure
- FIG. 13 illustrates a flow chart depicting a process for resource allocation in THz, according to an embodiment of the disclosure
- FIG. 14 illustrates a flow chart depicting a process for resource allocation in THz, according to an embodiment of the disclosure
- FIG. 15 illustrates a flow chart depicting a process for beam failure recovery in THz, according to an embodiment of the disclosure.
- FIG. 16 illustrates a block diagram of a system communication in a high frequency network base station, according to an embodiment of the disclosure.
- any terms used herein such as but not limited to “includes,” “comprises,” “has,” “consists,” and grammatical variants thereof do NOT specify an exact limitation or restriction and certainly do NOT exclude the possible addition of one or more features or elements, unless otherwise stated, and furthermore must NOT be taken to exclude the possible removal of one or more of the listed features and elements, unless otherwise stated with the limiting language “MUST comprise” or “NEEDS TO include.”
- UE user equipment
- PDA personal digital assistant
- synchronization signal block SSB
- synchronization message synchronization message
- the disclosure is directed towards introducing flexible bandwidth and center frequency allocation introduced in THz to support different types of users.
- the disclosure proposes that SSBs with different beamwidths be transmitted to support users at different distances in THz cell. Also, SSBs with different beamwidths can be multiplexed in time domain or frequency domain.
- the disclosure proposes a hierarchical beam width based initial acquisition for THz communications in which the SSBs with different beamwidths can be transmitted by the base station with varying or same periodicities, and the users can try to perform the acquisition in a hierarchical fashion.
- FIG. 2 illustrates a flow diagram depicting a method for communication in a high frequency network base station (BS), according to an embodiment of the disclosure.
- BS high frequency network base station
- UE user equipment
- the method 200 comprises generating a first beam having a first beamwidth in a first area of a cell.
- a base station provides coverage to a cell C1 and the cell is covered by a plurality of areas A1-An. Accordingly, a first beam with beamwidth ⁇ 1 is generated in A1.
- the first beamwidth can be considered as beamwidth which is required for maximum coverage in the first area of the cell.
- a 60 degrees beamwidth is required to provide maximum coverage in A1. Accordingly, the first beamwidth is 60 degrees.
- the first area i.e., A1 may be first determined and then the first beam may be generated.
- the method 200 comprises determining a plurality of second beamwidth levels for each of a plurality of second beams possible within the first beamwidth of the first beam.
- the first beamwidth may be divided into a plurality of second beamwidths and each of the second beamwidth is narrower than the first beamwidth.
- the first beam of beamwidth of 60 degree may be divided into 4 beamwidths of 15 degrees.
- the first beam of beamwidth of 60 degree may be divided into 2 beamwidths of 20 degrees and 2 beamwidths of 10 degrees. Accordingly, beamwidth level for each of the second possible beam is determined.
- the method 200 comprises generating the plurality of second beams having the plurality of second beamwidth levels based on the determination.
- the second beamwidth may be represented by ⁇ 2
- the method 200 comprises transmitting at least one synchronization message to a plurality of user equipment via the first beam and the plurality of second beams.
- the synchronization message may be transmitted using the first beam and the second beams.
- the synchronization message may be associated with a synchronization signal block (SSB).
- SSB synchronization signal block
- the different beamwidths i.e., the first beam and the second beams may be multiplexed either in time domain or frequency domain, to transmit the synchronization message.
- FIG. 3 illustrates multiplexing of the first beam and second beams in frequency domain, according to an embodiment of the disclosure.
- a first beam with a first beamwidth and a plurality of second beams are transmitted with a second beamwidth in different frequency levels but in a same time slot.
- These frequency levels can be similar to the 3 rd generation partnership project (3GPP) specification defined synchronization raster steps for new radio (NR) radio access technology (RAT).
- 3GPP 3 rd generation partnership project
- NR new radio
- RAT radio access technology
- FIG. 4 illustrates multiplexing of the first beam and second beams in time domain, according to an embodiment of the disclosure.
- a first and plurality of second beams with different beamwidths but a same SSB are transmitted consecutively one after the other and then the transmission is repeated once one set of the beams with all types of beamwidths is transmitted.
- the number of beams per beamwidth is same as the number of SSBs.
- all the beamwidths are transmitted with same periodicity.
- FIG. 5 illustrates multiplexing of the first beam and second beams in time domain, according to an embodiment of the disclosure.
- the number of beams possible within each beam width can be different such that all types of beamwidths can cover the area A1 of cell C1.
- N 1 , N 2 and N 3 represent the number of beams with beamwidths ⁇ 1 , ⁇ 2 , and ⁇ 3 , respectively, such that ⁇ 1 > ⁇ 2 > ⁇ 3
- the number of beams for these beamwidths follow the order of N 1 ⁇ N 2 ⁇ N 3 .
- the multiplexing sequence is decided by the BS.
- the number of beams for a given beamwidth may or may not be a multiple of the number of beams with largest beamwidth.
- the SSBs transmitted within one cycle can be transmitted from same set of antennas such that at least one UE can combine the signals at the receiver for better reception.
- the SSBs transmitted within one cycle can be transmitted with same transmit antenna set (but with different beamwidths by selecting specific set for each beam width) indicating that the at least one UE can use the receiver beam in same direction for receiving these SSBs within one cycle.
- sequencing of the first beam and the plurality of second beams is done such that the first beam and at least one of the plurality of second beams in same direction are multiplexed consecutively in the time domain.
- the base station may receive a response to the at least one synchronization message from the at least one UE, amongst the plurality of user equipment, over one of the first beam and the plurality of second beams.
- the base station may establish a connection with the at least one UE over one of the first beam and the plurality of second beams.
- the base station may establish a connection with the at least one UE over one of the first beam and the plurality of second beams.
- the base station receives the response over the first beam, then the base station establishes the connection with the UE over the first beam.
- the base station receives the response over the plurality of second beams, then the base station establishes the connection with the UE over the plurality of second beams.
- the at least one synchronization message may be transmitted via the first beam and the plurality of second beams during initial access procedure.
- the number of beams is higher compared to fifth generation (5G) New radio (NR) system.
- 5G fifth generation
- NR New radio
- the number of beams required to monitor and identify the cell may be high because of multiple beamwidths.
- the THz base station can choose to allow the beams with different beamwidths in only required directions for the user data transmission in the connected mode.
- FIG. 6 illustrates hierarchical beam sequencing, according to an embodiment of the disclosure. It is to be noted that, the sequencing of beams in THz system is done such that one SSB burst consists of multiple beam cycles, where each cycle has the beams of different beamwidths as shown in FIG. 6, where 3 beamwidth levels are considered. In a beam cycle, every beam set corresponding to a beamwidth level covers the same sector area. Further, in an embodiment, the hierarchical beams of different beamwidth may be combined with each other.
- FIGS. 7A and 7B illustrate pictorial representation of combining beams of different beamwidth, according to various embodiment of the disclosure.
- beams of a certain beamwidth are sequenced such that, when the received waveform is shifted in time in time units of slots, then the corresponding beams in same direction shall get combined as shown in FIGS. 7A and 7B.
- the UE can store the signals received during a burst and combine with appropriate time shifts. This combination helps in reducing the random noise and increasing the signal strength.
- time shifts of 1 slot and 2 slots will make sure of combining all the beams in same direction, as shown in FIG. 7A.
- time shifts of 2 slot and 4 slots will make sure of combining all the beams in same direction, as shown in FIG. 7B.
- FIG. 8 illustrates transmission of synchronization signal block (SSB) with a first beam and second beams, in accordance with according to an embodiment of the disclosure.
- SSB synchronization signal block
- sequencing of different beam width level synchronization signals may be indicated through a Radio Resource Control (RRC) Reconfiguration message.
- RRC Radio Resource Control
- default periodicity to transmit the beams with different beamwidth may be fixed to minimum level and the sequencing to include all the beam width levels, as shown in FIG. 8.
- periodicity of each cycle of the synchronization signals may be indicated through RRC Reconfiguration message.
- sequencing can be altered and allowing or disabling a beam width level can be indicated to the user through RRC Reconfiguration message based on the user distance.
- transmission of at least one synchronization message via the first beam and the plurality of second beams may be allowed or disabled using a bit map and the allowed or disabled state may be indicated to the receiver through higher layer, RRC reconfiguration message, Physical Downlink Control Channel (PDCCH), or Medium Access Control (MAC) Control Element (MAC CE).
- RRC reconfiguration message Physical Downlink Control Channel (PDCCH)
- MAC CE Medium Access Control
- transmit power of the beam with one of the beamwidths and the offsets for other beamwidth levels may be indicated through either broadcast message, Master Information Block (MIB) or the RRC reconfiguration message.
- MIB Master Information Block
- transmit powers for all the beamwidth levels may be indicated through either broadcast message, MIB or the RRC reconfiguration message.
- FIGS. 9A and 9B illustrate initial acquisition with suitable SSB beam widths, according to various embodiments of the disclosure.
- the base station can indicate random access channel (RACH) resources to the UE through either RRC Re-configuration message or SIB1. While indicating the RACH resources, base station can map each RACH occasion with one or more SSBs so that the base station's receiving beam can be used in that direction of SSB for receiving the RACH messages. If the SSBs of different beamwidths are transmitted using method of FIG. 7B, RACH occasions can be mapped to multiple SSBs that are transmitted using elements chosen from same set of antenna elements at the base station. In other words, a plurality of SSBs with different first and second beamwidths may be associated in the same direction to the same RACH occasions when the plurality of SSBs are associated with single RACH occasion.
- RACH random access channel
- FIG. 10 illustrates a flow chart depicting a process for initial RACH procedure in THz, according to an embodiment of the disclosure.
- the base station may generate the first beam and the second beam in accordance with techniques described in FIG. 2.
- the UE is one of the plurality of UEs to whom base station transmitted in operation 207.
- the UE performs power ramping in initial RACH preamble transmission.
- SSBs are identified whose reference signal received power (RSRP) crosses the required threshold of SSB-RSRP Threshold, i.e., a predetermined threshold.
- RSRP reference signal received power
- the base station may receive RACH preambles on RACH occasions corresponding to the second beamwidth level when at least one of synchronization message (SSB) is above the predetermined threshold.
- the predetermined threshold is configurable and may vary from one base station to another. However, if multiple SSBs cross the threshold, then the UE can prefer to choose the SSBs in a hierarchical fashion in the order of decreasing beam width. Then, at operation 1005, preamble power ramping counter (PREAMBLE_POWER_RAMPING_COUNTER) and the preamble transmission counter (PREAMBLE_TRANSMISSION_COUNTER) are set to 1.
- the UE can start transmitting the preamble with preamble power ramping counter and preamble transmission counter set to 1. Also, the UE may increment the power ramping and transmission counters by 1 in case the SSB chosen for preamble transmission doesn't change. The same can be applied for SSBs with different beam widths.
- RAR Random Access Response
- RACH is a four operation process. These four operations include:
- RAR Random Access Response
- msg3 i.e., RRC connection request is sent by the UE
- msg4 which is confirmation from the base station and end of RACH process. If no, then at operation 1013, it is checked if the preamble transmission counter is less than preamble maximum transmission counter (preambleTransMax). If no, then at operation 1015, RACH failure is indicated.
- next power level for preamble transmission is independent of beam widths. Hence, there will not be any need to reset the ramping counter. In other words, if SSB remains the same, then power ramping counter will increase, at operation 1021. If the SSB chosen is different, then ramping counter will be reset to 1 at operation 1023, as this indicates using a different direction.
- a second method different power operations can be defined for different beam widths and the power ramping counter is reset to 1 if beam width changes as well. This way, the initial RACH procedure is performed even if beams with different beamwidths have different beam gains and have different transmit power requirements for reliable reception at the receiver
- the preamble power ramping counter is increased and the method again moves to operation 1007. If no, then at operation 1023, the preamble power ramping counter is set to 1. This way, the initial RACH procedure is performed even if beams with different beamwidths have different beam gains and have different transmit power requirements for reliable reception at the receiver.
- the preamble power ramping counter shall be reset when different SSB or the SSB with different beam width is chosen for next preamble transmission or shall remain if same SSB is chosen with same beam width as that of the last preamble transmission. Also, the preamble transmission counter shall be incremented irrespective of the SSB beam width level chosen for preamble transmission.
- THz frequency experiences absorption noise which causes unwanted spikes in the path loss at certain frequencies with increasing distance, as shown in FIG. 11.
- FIG. 11 From FIG. 11, it can be seen that at 0.55THz, receiver at the UE, at 1m has only path loss of ⁇ 90 dB, whereas the receiver at 10m distance will experience a path loss of 175 dB.
- the base station should be able to estimate the distance at which the UE is located and allocate the resources accordingly.
- the UE is one of the plurality of UEs to whom base station transmitted in operation 207. In an embodiment, a procedure for distance aware resource allocation for THz is discussed below.
- Resource allocations for uplink and downlink are done at the base station when the UE requests for RACH with uplink data request and whenever there is a data to be transmitted to the UE in the downlink, respectively.
- the base station allocates the resources for uplink data once the RACH becomes successful and then indicates the uplink resources to the UE using the downlink control information (DCI) content in the PDCCH channel.
- DCI downlink control information
- the base station indicates the downlink resources to the UE through DCI while in connected mode or through paging message while in idle mode.
- the base station may determine distance at which the at least one UE is located and path loss experienced by the at least one UE. Thereafter, the base station may determine resources and center frequency for at least one of the plurality of UE based on at least one of the distance and the path loss.
- FIGS. 12 to 14 present different embodiments for resource allocation. It is to be noted that the base station may perform the methods as described in reference to FIGS. 12 to 14 using the first beam and/or plurality of second beams generated in accordance with techniques described in FIG. 2.
- FIG. 12 illustrates a flow chart depicting a process for resource allocation in THz, according to an embodiment of the disclosure.
- a base station can receive transmit power of UE using pre-defined bits in the MSG-3 of RACH transmission or Physical Uplink Control Channel/Physical uplink shared channel (PUCCH/PUSCH). It is to be noted that the number of bits 'N' may vary for different UEs.
- the base station may calculate the path loss using the reference signals transmitted in the MSG-3 and the transmit power indication.
- the base station may estimate the distance using the path loss observed at the base station and the frequency of operation with the help of path loss curve for each humidity level.
- the humidity level can be determined using a humidity sensor or hygrometer at the base station.
- the base station can allocate the frequency resources (i.e., center frequency and/or bandwidth) to the UE avoiding high path loss frequencies.
- the base station can indicate the change of frequency resources and the center frequency through downlink control information (DCI). This method is helpful for allocating resources for uplink or the following downlink transmissions when RACH is initiated for uplink data transmission request.
- DCI downlink control information
- FIG. 13 illustrates a flow chart depicting a process for resource allocation in THz, according to an embodiment of the disclosure.
- the base station requests the UE for transmitting sounding reference signals with the required transmit power parameters indicated through RRC and the DCI.
- the base station may receive sounding reference signals (SRS) from the UE using the transmit power parameters indicated by the base station.
- the base station may calculate the path loss using the sounding signals transmitted and the SRS transmit power parameters that are indicated to the UE by the base station.
- the base station may estimate the distance using the path loss observed at the base station and the frequency of operation with the help of path loss curve for each humidity level.
- SRS sounding reference signals
- Humidity level can be determined using a humidity sensor or hygrometer at the base station.
- the base station can allocate the frequency resources (i.e., center frequency and/or bandwidth) to the UE avoiding high path loss frequencies.
- the base station can indicate the change of frequency resources and the center frequency through downlink control information (DCI). This method is helpful for allocating resources for uplink or downlink using the sounding reference signals. The periodicity of this method of allocating resources can be adjusted by the base station as per the user movement. Further, along with the bandwidth change, the base station may also indicate the center frequency change (if required) through the DCI in THz system, which is beneficial for users supporting limited bandwidth and their current center frequency falls under high path loss frequency.
- DCI downlink control information
- FIG. 14 illustrates a flow chart depicting a process for resource allocation in THz, according to an embodiment of the disclosure.
- the base station requests the UE for estimating the path loss using any of the downlink reference signals such as SSB or Channel State Information Reference Signal (CSI-RS), indicating their transmit power.
- CSI-RS Channel State Information Reference Signal
- the UE ay estimate the path loss using the configured reference signal and the transmit power parameters indicated by the base station.
- the base station may receive the path loss range or the distance range from the UE, wherein the UE incorporates the path loss information or the distance range in the uplink control information transmitted either using PUCCH/PUSCH.
- a pre-defined N number of bits may be identified in (PUCCH/PUSCH) for indicating the path loss information. It is to be noted that the number of bits 'N' may vary for different UEs.
- the base station may estimate the distance using the path loss observed at the base station and the frequency of operation with the help of path loss curve for each humidity level.
- Humidity level can be determined using a humidity sensor or hygrometer at the base station.
- the base station can use the distance for identifying the frequency resources.
- the base station can allocate the frequency resources (i.e., center frequency and/or bandwidth) to the UE avoiding high path loss frequencies.
- the base station can indicate the change of frequency resources and the center frequency through downlink control information (DCI). This method is helpful when the UE cannot share the transmit power parameters with the base station, but has a provision for sharing the path loss or the distance range values with the base station.
- DCI downlink control information
- THz Due to the high frequency of operation, THz gets severely affected by the blockages which may cause frequent beam blockages and beam failures. This can result in frequent beam recovery procedures in THz.
- UE can perform a RACH procedure for beam failure recovery with new candidate beams after the beam failure is detected.
- Dedicated RACH resources can be allocated for beam failure recovery as part of RRC configuration BeamFailureRecoveryConfig.
- the disclosure discloses a method for beam failure recovery which supports multiple such RACH occasions for beam failure recovery, which can come as a part of dedicated RACH configuration, possible to be transmitted with different candidate beams. Further, the multiple RACH transmissions can also be transmitted with same candidate beam which increases the probability of the RACH success in less time.
- multiple RACH occasions are introduced for beam failure recovery in THz, for faster recovery. These RACH occasions can be multiplexed in time domain with same or different candidate beams crossing the threshold.
- FIG. 15 illustrates a flow chart depicting a process for beam failure recovery in THz, according to an embodiment of the disclosure.
- at operations 1501 and 1503 at least one beam is identified for beam failure recovery through multiple random-access channel (RACH) occasions.
- RACH random-access channel
- multiple RACH preambles are transmitted in time division manner with indices corresponding to the identified using at least one beam.
- the preamble is retransmitted.
- preamble transmission counter is less than preamble maximum transmission counter (i.e., PREAMBLE_TRANSMISSION_COUNTER ⁇ preambleTransMax). If yes, then the method moves to operation 1505. If no, then it is checked if beam failure recovery timer is expired. If yes, then the method stops. If not, then a beam is identified for beam failure from different candidate beams.
- preamble maximum transmission counter i.e., PREAMBLE_TRANSMISSION_COUNTER ⁇ preambleTransMax.
- FIG. 16 illustrates a block diagram of a system for communication in a high frequency network base station, according to an embodiment of the disclosure.
- the system 1600 may include, but is not limited to, a processor 1602, memory 1604, and data 1608.
- the memory 1604 may be coupled to the processor 1602.
- the processor 1602 may be configured to generate a first beam having a first beamwidth in a first area of a cell, determine a plurality of second beamwidth levels for each of a plurality of second beams possible in the first beamwidth of the first beam, wherein a second beamwidth is narrower than the first beamwidth, generate the plurality of second d beams having the plurality of second beamwidth levels based on the determination, and transmit at least one synchronization message to a plurality of user equipment via the first beam and the plurality of second beams.
- the system 1600 may be configured to perform the method as discussed in respect to FIGS. 2 through 15. Further, the system 1600 may be a part of the base station. In another embodiment, the system 1600 may be connected to the base station.
- the processor 1602 can be a single processing unit or several units, all of which could include multiple computing units.
- the processor 1602 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions.
- the processor 1602 is configured to fetch and execute computer-readable instructions and data stored in the memory 1604.
- the memory 1604 may include any non-transitory computer-readable medium including, for example, volatile memory, such as static random access memory (SRAM) and dynamic random access memory (DRAM), and/or non-volatile memory, such as read-only memory (ROM), erasable programmable ROM, flash memories, hard disks, optical disks, and magnetic tapes.
- volatile memory such as static random access memory (SRAM) and dynamic random access memory (DRAM)
- DRAM dynamic random access memory
- non-volatile memory such as read-only memory (ROM), erasable programmable ROM, flash memories, hard disks, optical disks, and magnetic tapes.
- the data 1608 serves, amongst other things, as a repository for storing data processed, received, and generated by the processor 1602.
- the disclosure identifies the protocol changes required for implementing 6G-THz system in compatibility with the existing 5G NR system.
- the disclosure discloses techniques for sequencing for hierarchical beams, which is very crucial for THz system, where hierarchical beams in a direction with different beamwidths are transmitted consecutively, which helps in combining the beams efficiently at the receiver increasing the overall Signal-Noise Ratio (SNR) observed at the receiver and also help in increasing the cell coverage for THz system.
- SNR Signal-Noise Ratio
- there can be further implementation specific fundamental solutions to overcome the high propagation loss such as increased transmit power, using repeaters or repeated transmissions, more number of antennas for increased antenna gain, which could be identified during the standardization of THz system.
- SSB transmit beam sequencing in THz system allows combining across multiple beamwidths which improves the cell coverage and the observed SNR at the receiver, and also reduces the cell search time because of this.
- same SSB burst period for THz system may be used which was used in 5G NR i.e., 5ms to maintain the compatibility.
- 5ms 5ms
- a total of 40 slots are available within SSB burst of 5ms, out of which 32 slots are only used to transmit 64 SSBs in current 5G NR system.
- a maximum of 80 SSBs may be transmitted without adding any delay.
- the number of slots within SSB burst shall increase, making it feasible to transmit more SSBs within an SSB burst, i.e., 160 SSBs in 80 slots for 240 KHz subcarrier spacing (SCS).
- SCS subcarrier spacing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims (15)
- A method for communication by a base station in a high frequency network, the method comprising:generating a first beam having a first beamwidth in a first area of a cell;determining a plurality of second beamwidth levels for a plurality of second beams possible in the first beamwidth of the first beam, wherein a second beamwidth associated with each of the plurality of second beams is narrower than the first beamwidth;generating the plurality of second beams having the determined plurality of second beamwidth levels; andtransmitting at least one synchronization message to a plurality of user equipments (UEs) via the first beam and the plurality of second beams.
- The method of claim 1, wherein the first beamwidth is required for maximum coverage in the first area of the cell.
- The method of claim 1, wherein the first beam is generated subsequent to determining the first area.
- The method of claim 1, further comprising:receiving a response to the at least one synchronization message from at least one user equipment, amongst the plurality of user equipment, over one of the first beam or the plurality of second beams; andestablishing a connection with the at least one user equipment over one of the first beam or the plurality of second beams.
- The method of claim 1, further comprising:transmitting the at least one synchronization message via the first beam and the plurality of second beams in frequency domain,wherein the at least one synchronization message with the first beam and the plurality of second beams is transmitted periodically.
- The method of claim 1, wherein the transmitting of the at least one synchronization message comprises:multiplexing the first beam and the plurality of second beams in time domain,wherein a sequencing of the first beam and the plurality of second beams respectively is done such that the first beam and at least one of the plurality of second beams in a same direction are multiplexed consecutively in the time domain.
- The method of claim 1, wherein the transmitting of the at least one synchronization message comprises:multiplexing the first beam and the plurality of second beams in time domain,wherein a sequencing of the first beam and the plurality of second beams with the first and second beamwidths respectively is done using either of the methods such that a number of beams in the second beamwidth can be a multiple of the number of beams with maximum beamwidth or the number of beams in all beamwidths are generated independent of each other.
- The method of claim 1, wherein the at least one synchronization message is transmitted via the first beam and the plurality of second beams during an initial access procedure.
- The method of claim 1, further comprising:allowing or disabling transmission of at least one synchronization message via the first beam and the plurality of second beams using a bit map;indicating the allowing or disabling to a receiver through higher layer, radio resource control (RRC) reconfiguration message, physical downlink control channel (PDCCH), or medium access control (MAC) Control Element (MAC CE); andindicating transmit power of a beam with one beamwidth and offsets for other beamwidth levels through either a broadcast message, master information block (MIB), or the RRC reconfiguration message.
- The method of claim 1, further comprising:associating a plurality of synchronization signal blocks (SSBs) with different first and second beam widths, in a same direction to a same radio access channel (RACH) occasions when the plurality of SSBs are associated with single RACH occasion; andreceiving RACH preambles on RACH occasions corresponding to a second beamwidth level when the at least one synchronization message is above a predetermined threshold,wherein a power ramping counter is incremented using a transmit power offset indicated when at least one UE changes the SSBs with different beam widths.
- The method of claim 1, further comprising:determining distance at which at least one UE among the plurality of UEs, is located and path loss experienced by the at least one UE; anddetermining resources and center frequency for at least one of the plurality of UEs based on at least one of the distance or the path loss.
- The method of claim 11, wherein the determining of the path loss comprises:receiving transmit power of the at least one UE using first pre-defined N number of bits either through a message-3 (MSG-3) or physical uplink control channel/ physical uplink shared channel (PUCCH/PUSCH), and determining the path loss based on the received transmit power; orreceiving the path loss using second pre-defined N number of bits through physical uplink control channel or physical uplink shared channel (PUCCH/PUSCH).
- The method of claim 11, wherein the determining of the distance comprises receiving the distance using pre-defined N number of bits through physical uplink control channel or physical uplink shared channel (PUCCH/PUSCH).
- The method of claim 1, further comprising:identifying at least one beam for beam failure recovery through multiple random-access channel (RACH) occasions;transmitting multiple RACH preambles in time division manner with indices corresponding to the identified at least one beam;determining if random access response (RAR) is received from the at least one beam; andrepeating operations a to c for a maximum number 'N' of simultaneous RACH transmissions until the RAR is received from the at least one beam.
- A base station for communication in a high frequency network, the base station comprising:a memory; anda processor coupled to the memory and configured to be operated according to a method in one of claims 1 to 14.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280037819.8A CN117413558A (en) | 2021-05-27 | 2022-05-26 | Method and base station for communication in high frequency network |
US17/825,555 US20220386143A1 (en) | 2021-05-27 | 2022-05-26 | Method and base station for communication in a high frequency network |
EP22811664.6A EP4282177A1 (en) | 2021-05-27 | 2022-05-26 | Method and base station for communication in a high frequency network |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IN202141023706 | 2021-05-27 | ||
IN202141023706 | 2021-05-27 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/825,555 Continuation US20220386143A1 (en) | 2021-05-27 | 2022-05-26 | Method and base station for communication in a high frequency network |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022250473A1 true WO2022250473A1 (en) | 2022-12-01 |
Family
ID=84230323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2022/007491 WO2022250473A1 (en) | 2021-05-27 | 2022-05-26 | Method and base station for communication in a high frequency network |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2022250473A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101820733B1 (en) * | 2011-08-24 | 2018-01-22 | 삼성전자주식회사 | Apparatus and method for selecting beam in wireless communication system |
US20180359717A1 (en) * | 2017-06-09 | 2018-12-13 | Qualcomm Incorporated | Signaling of synchronization block patterns |
US10499435B2 (en) * | 2017-01-05 | 2019-12-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Configuration of beamforming mode |
WO2020172404A1 (en) * | 2019-02-21 | 2020-08-27 | Qualcomm Incorporated | Random access channel (rach) signature selection |
US11005553B2 (en) * | 2018-08-22 | 2021-05-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Beam training performed by a terminal device |
-
2022
- 2022-05-26 WO PCT/KR2022/007491 patent/WO2022250473A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101820733B1 (en) * | 2011-08-24 | 2018-01-22 | 삼성전자주식회사 | Apparatus and method for selecting beam in wireless communication system |
US10499435B2 (en) * | 2017-01-05 | 2019-12-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Configuration of beamforming mode |
US20180359717A1 (en) * | 2017-06-09 | 2018-12-13 | Qualcomm Incorporated | Signaling of synchronization block patterns |
US11005553B2 (en) * | 2018-08-22 | 2021-05-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Beam training performed by a terminal device |
WO2020172404A1 (en) * | 2019-02-21 | 2020-08-27 | Qualcomm Incorporated | Random access channel (rach) signature selection |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11219061B2 (en) | Listen-before-talk (LBT) modes for random access procedures | |
WO2018174526A1 (en) | Method and device for scheduling request in nb iot systems | |
WO2020145701A1 (en) | Method and apparatus for transmitting and receiving a signal in a wireless communication system | |
WO2013169035A1 (en) | Scheme for performing beamforming in communication system | |
WO2019221533A1 (en) | Method and apparatus for configuring dmrs information in v2x system | |
WO2010126245A2 (en) | Rach-specific informaiton transmission methods and apparatuses for wireless communication system | |
WO2015126130A1 (en) | Method and device for selecting and allocating transmission beam index having priority | |
WO2016119452A1 (en) | Air channel detection method and node device | |
WO2010082735A2 (en) | Method of transmitting signal in a wireless system | |
EP3603276B1 (en) | Methods and apparatus for determining network identifier for use by user equipment | |
US10952168B2 (en) | Method for transmitting downlink control signal and apparatus | |
EP3603303A1 (en) | Method and device for scheduling request in nb iot systems | |
WO2019242461A1 (en) | Information transmission method and apparatus | |
WO2019108022A1 (en) | Improvements in and relating to route discovery in a telecommunication network | |
US20230189103A1 (en) | Communication method and apparatus | |
WO2011132896A2 (en) | Method for transmitting pilot signal for machine to machine communication in wireless communication system and apparatus thereof | |
JP2018511989A (en) | Method, network node, and wireless device for handling access information | |
CN107182070B (en) | Wireless network channel quality updating and transmitting method | |
WO2019194603A1 (en) | Method and device for mitigating interference in unlicensed band | |
WO2018030614A1 (en) | Signal transmission method and device using variable resource structure | |
CN115396075A (en) | Information transmission method and network equipment | |
WO2020162726A1 (en) | Method and apparatus for indicating two-step random access procedure in wireless communication system | |
WO2020032554A1 (en) | Method and device for measuring beam in wireless communication system | |
WO2022030958A1 (en) | Method and system for managing configuration and control information of mbs services in wireless network | |
WO2021244378A1 (en) | Cell access method and apparatus, device, and storage medium |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22811664 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022811664 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2022811664 Country of ref document: EP Effective date: 20230824 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280037819.8 Country of ref document: CN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |