WO2022017157A1 - 随机接入前导码序列的发送、接收方法、终端及网络设备 - Google Patents
随机接入前导码序列的发送、接收方法、终端及网络设备 Download PDFInfo
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- WO2022017157A1 WO2022017157A1 PCT/CN2021/104233 CN2021104233W WO2022017157A1 WO 2022017157 A1 WO2022017157 A1 WO 2022017157A1 CN 2021104233 W CN2021104233 W CN 2021104233W WO 2022017157 A1 WO2022017157 A1 WO 2022017157A1
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- random access
- preamble sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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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
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present disclosure relates to the field of communication technologies, and in particular, to a method, a terminal, and a network device for sending and receiving a random access preamble sequence.
- the 4-step random access process includes:
- Step 1 The terminal (user equipment, UE) sends a random access preamble (Preamble) sequence (ie, message 1, Msg1) on the physical random access channel (physical random access channel, PRACH);
- Preamble a random access preamble sequence
- Msg1 message 1, Msg1
- PRACH physical random access channel
- Step 2 The UE receives a random access response (RAR) message (ie, message 2, Msg2) on the physical downlink control channel (PDCCH)/physical downlink shared channel (PDSCH) );
- RAR random access response
- Step 3 UE sends message 3 (Msg3) on the physical uplink shared channel (PUSCH) channel;
- Msg3 message 3
- PUSCH physical uplink shared channel
- Step 4 The UE receives a contention resolution message (ie, message 4, Msg4) on the PDSCH channel.
- a contention resolution message ie, message 4, Msg4
- the terminal Before performing the random access process, the terminal obtains the set of SS/PBCH block (Synchronization Signal/PBCH Block, SSB) indexes, physical layer time-frequency resources, random access preamble sequence format and random access preamble through a system broadcast message parameters of the sequence set, and then the UE generates a random access preamble sequence according to the obtained information, and initiates random access on the corresponding physical layer random access time-frequency resources.
- SS/PBCH block Synchronization Signal/PBCH Block
- the base station detects the PRACH, and if the base station detects the preamble sequence, it feeds back corresponding random access response (RAR) information on the PDCCH/PDSCH.
- RAR random access response
- the RAR information also includes an uplink timing advance adjustment amount of the UE, and the terminal can obtain uplink synchronization according to the adjustment amount, and then can send an uplink resource scheduling request message for subsequent data transmission.
- the random access configuration table of FR2 is shown in Table 2 below (Random access configurations for FR2 and unpaired spectrum).
- Random access configurations for FR2 and unpaired spectrum Random access configurations for FR2 and unpaired spectrum.
- the corresponding preamble format, the radio frame where the PRACH resource is located, the specific subframe number, the start symbol of the PRACH resource in the RACH slot (time slot), and the time domain PRACH occasion in the RACH time slot can be obtained.
- SCS subcarrier spacing
- PRACH SCS supports 60KHz or 120KHz.
- RACH time slot if the number of configured PRACH time slots is 1 in a cycle that allows two PRACH time slots, the second time slot in each cycle is used as a PRACH time slot. is 2, then both time slots in the cycle are PRACH time slots, as shown in Figure 2.
- TDD time division duplex
- SSB synchronization signal block
- TDD Time division duplex
- the UE receives the TDD UL-DL-ConfigurationCommon, if the PRACH opportunity is on the UL (Uplink) symbol, and there is no SSB after the PRACH opportunity in the current PRACH slot, it is the same as the previous closest PRACH opportunity.
- the last symbol of SSB is separated by at least N gap symbols, and is separated from the last DL (Downlink) symbol by at least N gap symbols, then the PRACH opportunity is valid, and the value of N gap can refer to the corresponding table in the standard.
- the NR protocol focuses on optimizing the design of the transmit beam and receive beam of the base station in the Msg1 and Msg2 processes.
- the base station notifies the terminal of the parameters that determine the relationship between the SSB and the RACH occasion (RO) resource subset (including: the reference signal received power (reference signal received power, RSRP) threshold selected by the SSB) through a system broadcast message, wherein , an RO resource subset consists of one or more ROs.
- RO RACH occasion
- the UE performs downlink SSB detection to determine whether the actual RSRP measurement value of the SSB is greater than the RSRP threshold obtained from the system broadcast message. If the determination is true, the RO resource subset associated with the SSB is used as the candidate Msg1 resource set.
- the base station transmits the Msg2 on the associated transmission beam according to the detected RO resource of the preamble and the above-mentioned association relationship with the downlink transmission beam.
- RO refers to the time-frequency resource used to transmit PRACH Msg1 on a specific transmit beam according to the configured PRACH preamble sequence format
- the energy attenuation during the signal propagation process is too large, and maintaining the preamble sequence format in the related art may lead to a decrease in coverage, thereby affecting the operable range and reliability of the initial access process.
- the beams of the ultra-high frequency band will become narrower than the original FR1 and FR2, slight changes in the beam transmission and reception directions may cause the transmission and reception beams to be out of alignment, resulting in performance loss.
- Embodiments of the present disclosure provide a method, a terminal, and a network device for sending and receiving a random access preamble sequence.
- the transmission energy of the preamble is improved, and the process of transmitting PRACH by beam scanning is added to the UE, so as to reduce the impact on the random access process caused by the incomplete alignment of the transmitting and receiving beams.
- a method for sending a random access preamble sequence, applied to a terminal comprising:
- a random access preamble sequence is sent on the time-frequency resource.
- the random access preamble sequence format includes M formats; the time domain length corresponding to at least one of the M formats is n times the first preset value, and a cyclic prefix (Cyclic Prefix, The length of CP) is n times the second preset value, where n is a positive integer.
- the M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format;
- the time domain lengths N ⁇ corresponding to the first format, the second format, and the third format are respectively n times the first value, and the lengths of the corresponding cyclic prefixes CP are respectively respectively n times the second value;
- the time domain length N ⁇ corresponding to the fourth format, the fifth format, the sixth format, and the seventh format are respectively n times of the third value, and the length of the corresponding cyclic prefix CP They are (2n+1) ⁇ 72 ⁇ 2- ⁇ , (4n+1) ⁇ 72 ⁇ 2- ⁇ , (6n+1) ⁇ 72 ⁇ 2- ⁇ , (12n+1) ⁇ 72 ⁇ 2- ⁇ ;
- the corresponding time domain length N ⁇ is n times the fifth value, respectively, and the corresponding length of the cyclic prefix CP Leave the sixth value unchanged.
- the random access configuration information 2 ⁇ -3 consecutive physical random access channel PRACH time slots are bound into a sub-block, and ⁇ 3; the random access configuration information further includes at least one of the following: kinds of parameters:
- the number of PRACH opportunities in the time domain in a PRACH slot is
- the number of PRACH opportunities in the time domain in a PRACH slot is less than 1, and the number of symbols included in the corresponding PRACH time domain is less than 14, then the number of PRACH opportunities is 1;
- the number of PRACH opportunities in the time domain in a PRACH slot greater than 1 and non-integer, the number of PRACH occasions is pair The resulting value is rounded down.
- the number of PRACH time slots included in the basic granularity of the time domain is 2;
- the random access preamble sequence formats include M+L formats;
- the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, Seventh format, eighth format and ninth format;
- L is an integer greater than or equal to 1;
- time domain length N ⁇ corresponding to the first format, the second format, and the third format respectively is the first value
- the length of the corresponding cyclic prefix CP respectively is the second value
- the corresponding time domain length N ⁇ is the fifth value
- the corresponding length of the cyclic prefix CP is the sixth value.
- determine the time-frequency resource for sending the random access preamble sequence including:
- sending a random access preamble sequence on the time-frequency resource includes:
- the first time interval Gap used for beam switching is located at the beginning of each RO.
- each RO is the same; or,
- the first symbol of each RO is used in its entirety for beam switching.
- the second time interval Gap used for beam switching is located on the symbol where beam switching occurs.
- the second time interval Gap is located at the header of the symbol where beam switching occurs, and the remaining part of the symbol is used to send the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located at the end of the symbol where the beam switching occurs, and the immediately following symbol is used to transmit the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam
- the cyclic prefix CP of the set is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam.
- the number of times the beams can be switched in one RO does not exceed n.
- a corresponding parameter is introduced in the high layer to indicate the number of beams used in one RO, and the number of beams is indicated by log 2 n bits;
- a new information field is introduced in PDCCH format 1-0 or a reserved bit is used to indicate the number of beams used in one RO.
- the information field or reserved bit is determined by log 2 n bits to indicate.
- the RO is equally divided into m parts in the time domain according to the configured or pre-configured number m of available beams;
- the RO can be equally divided into m parts in the time domain, the first symbols of the remaining m-1 parts of the m beams except the first part are used for beam switching;
- the m' number of symbols as the remainder is included in the mth part, or the first m' parts are allocated one more symbol, and the first symbols of the m parts are all for beam switching.
- the switching sequence of transmit beams in the same RO includes:
- the terminal detects the downlink synchronization block, and determines whether the actual RSRP measurement value of the synchronization block is greater than the RSRP threshold obtained from the system broadcast message.
- the beam corresponding to the synchronization block is used as the center beam;
- the terminal uses the PDCCH signaling to designate the beam corresponding to the synchronization block as the center beam.
- m beams after m beams are configured, it also includes:
- Switching is performed according to the order of the synchronization block index corresponding to each beam from large to small or from small to large, and each part of the content of the RO is sent in the beam.
- Embodiments of the present disclosure also provide a method for receiving a random access preamble sequence, which is applied to a network device, and the method includes:
- the random access preamble sequence sent by the receiving terminal on the time-frequency resource for sending the random access preamble sequence includes:
- the network device If the corresponding receive beams of the network device can cover the transmit beams of m terminals and do not switch the receive beams, the network device combines all the preambles for detection after receiving the preambles from multiple different beams; or
- the network device only receives the preambles on part of the beams;
- the network equipment If the corresponding receiving beams of the network equipment cannot cover the transmitting beams of m terminals, but the network equipment switches the receiving beams, the network equipment first determines the central receiving beam according to the correlation between the RO resources of the detected preamble and the downlink transmitting beams. , select m-1 beams closest to the center beam to perform beam switching and receive the same RO; on the remaining m-1 beams, according to the synchronization block index corresponding to each beam, from large to small or from small to large order Switch beams to receive the remainder of the RO contents.
- An embodiment of the present disclosure further provides a terminal, including: a transceiver, a processor, and a memory, where a program executable by the processor is stored in the memory; when the processor executes the program, the processor implements: receiving a random connection input configuration information, the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; according to the preamble sequence format, determine the time-frequency resource for sending the random access preamble sequence; A random access preamble sequence is sent on the time-frequency resource.
- the random access preamble sequence format includes M formats; the time domain length corresponding to at least one of the M formats is n times the first preset value, and the length of the cyclic prefix CP is n times the second preset value, where n is a positive integer.
- the time domain lengths N ⁇ corresponding to the first format, the second format, and the third format are respectively n times the first value, and the lengths of the corresponding cyclic prefixes CP are respectively respectively n times the second value;
- the time domain length N ⁇ corresponding to the fourth format, the fifth format, the sixth format, and the seventh format are respectively n times of the third value, and the length of the corresponding cyclic prefix CP are (2n+1) ⁇ 72 ⁇ 2- ⁇ , (4n+1) ⁇ 72 ⁇ 2- ⁇ , (6n+1) ⁇ 72 ⁇ 2- ⁇ , (12n+1) ⁇ 72 ⁇ 2- ⁇ ;
- the corresponding time domain length N ⁇ is n times the fifth value, respectively, and the corresponding length of the cyclic prefix CP Leave the sixth value unchanged.
- the processor is further configured to: in the random access configuration information, 2 ⁇ -3 consecutive physical random access channel PRACH time slots are bound into a sub-block, ⁇ 3;
- the incoming configuration information also includes at least one of the following parameters:
- the number of PRACH opportunities in the time domain in a PRACH slot is
- the number of PRACH opportunities in the time domain in a PRACH slot is less than 1, and the number of symbols included in the corresponding PRACH time domain is less than 14, then the number of PRACH opportunities is 1;
- the number of PRACH opportunities in the time domain in a PRACH slot greater than 1 and non-integer, the number of PRACH occasions is pair The resulting value is rounded down.
- the number of PRACH time slots included in the basic granularity of the time domain is 2;
- the random access preamble sequence formats include M+L formats;
- the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, Seventh format, eighth format and ninth format;
- L is an integer greater than or equal to 1;
- time domain length N ⁇ corresponding to the first format, the second format, and the third format respectively is the first value
- the length of the corresponding cyclic prefix CP respectively is the second value
- the corresponding time domain length N ⁇ is the fifth value
- the corresponding length of the cyclic prefix CP is the sixth value.
- determine the time-frequency resource for sending the random access preamble sequence including:
- sending a random access preamble sequence on the time-frequency resource includes:
- the first time interval Gap used for beam switching is located at the beginning of each RO.
- each RO is the same; or,
- the first symbol of each RO is used in its entirety for beam switching.
- the second time interval Gap used for beam switching is located on the symbol where beam switching occurs.
- the second time interval Gap is located at the header of the symbol where beam switching occurs, and the remaining part of the symbol is used to send the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located at the end of the symbol where the beam switching occurs, and the immediately following symbol is used to transmit the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam
- the cyclic prefix CP of the set is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam.
- the RO is equally divided into m parts in the time domain, and the m parts of the beams are divided by the first part.
- the first symbols of the remaining m-1 copies are used for beam switching;
- the m' number of symbols as the remainder is included in the mth part, or the first m' parts are allocated one more symbol.
- the switching sequence of transmit beams in the same RO is as follows:
- the terminal detects the downlink synchronization block, and determines whether the actual RSRP measurement value of the synchronization block is greater than the RSRP threshold obtained from the system broadcast message.
- the beam corresponding to the synchronization block is used as the center beam;
- the terminal uses the PDCCH signaling to designate the beam corresponding to the synchronization block as the center beam.
- the processor is further configured to switch according to the order of synchronization block indices corresponding to each beam from large to small or from small to large, and send each part of the content of the RO in the beam.
- Embodiments of the present disclosure also provide an apparatus for sending a random access preamble sequence, which is applied to a terminal, and the apparatus includes:
- a transceiver module configured to receive random access configuration information, where the number of time-domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value
- a processing module configured to determine a time-frequency resource for sending a random access preamble sequence according to the preamble sequence format
- the transceiver module is further configured to send a random access preamble sequence on the time-frequency resource.
- An embodiment of the present disclosure further provides a network device, including: a transceiver, a processor, and a memory, where a program executable by the processor is stored in the memory; when the processor executes the program, the processor implements: sending a random access configuration information, the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; the random access preamble sequence.
- a network device including: a transceiver, a processor, and a memory, where a program executable by the processor is stored in the memory; when the processor executes the program, the processor implements: sending a random access configuration information, the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; the random access preamble sequence.
- Embodiments of the present disclosure also provide an apparatus for receiving a random access preamble sequence, which is applied to network equipment, including:
- a transceiver module configured to send random access configuration information, where the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; the receiving terminal sends the random access preamble sequence at the time-frequency The random access preamble sequence sent on the resource.
- Embodiments of the present disclosure also provide a processor-readable storage medium storing processor-executable instructions for causing the processor to execute the above-mentioned Methods.
- the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; according to the preamble sequence format, it is determined to send The time-frequency resource of the random access preamble sequence; the random access preamble sequence is sent on the time-frequency resource.
- the transmission energy of the preamble is improved.
- the process of transmitting PRACH by beam scanning is added to the terminal to reduce the impact of the transmission and reception beams being unable to be completely aligned on the random access process.
- 1 is a schematic flow chart of a 4-step random access process method
- Fig. 2 is RO (RACH occasion) configuration schematic diagram
- FIG. 3 is a schematic diagram of a method for sending a random access preamble sequence of the present disclosure
- FIG. 4 is a schematic diagram of a PRACH configuration mapping rule of 240KHz in an embodiment of the present disclosure
- FIG. 5 is a schematic diagram of an RO header structure in an embodiment of the present disclosure.
- FIG. 6 is a schematic diagram of beam switching at an RO initial position in an embodiment of the present disclosure
- FIG. 7 is a schematic diagram of performing one beam switching in one RO in an embodiment of the present disclosure.
- FIG. 8 is a schematic diagram of performing one beam switching in one RO in an embodiment of the present disclosure.
- FIG. 9 is a schematic diagram of performing one beam switching in one RO in an embodiment of the present disclosure.
- FIG. 10 is a schematic diagram of a comparison between a format that can perform beam switching in an RO and an RO format in the related art in an embodiment of the present disclosure
- FIG. 12 is a schematic block diagram of an apparatus for sending a random access preamble sequence according to an embodiment of the present disclosure.
- an embodiment of the present disclosure provides a method for sending a random access preamble sequence, which is applied to a terminal, and the method includes:
- Step 31 Receive random access configuration information, where the number of time-domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value
- Step 32 Determine the time-frequency resource for sending the random access preamble sequence according to the preamble sequence format
- Step 33 Send a random access preamble sequence on the time-frequency resource.
- the preset value may be the number of time-domain symbols corresponding to each preamble sequence format in Table 1 above.
- the transmission energy improvement coverage is improved; Influenced by the increase in the number of time-domain symbols in the code sequence format, the PRACH configuration table in the related art also needs to be redesigned to adapt to the new structure; due to the increase in the number of preamble time-domain symbols, in order to perform multiple Beam switching creates conditions, so the same RO can be sent on different beams, and corresponding scheme design is required for beam switching.
- the sending and receiving process of Msg1 may specifically include:
- the UE After the UE receives the prach-Configuration Index of the configuration information of the cell, it checks the PRACH configuration table to determine the specific PRACH configuration, including the specific preamble sequence format used, the number of ROs, the number of symbols occupied by each RO, the time domain location, etc. information, in the embodiment of the present disclosure, a new preamble sequence format is proposed, and at the same time, the specific configuration information in the corresponding PRACH configuration table needs to be updated based on the newly added preamble sequence format design;
- the random access preamble sequence formats include M formats; the time domain length corresponding to at least one of the M formats is a first preset value n times, the length of the cyclic prefix CP is n times the second preset value, where n is a positive integer.
- the first preset value here generally refers to the time domain length in a certain format, such as the value of N ⁇ corresponding to format A1, which may be 2 ⁇ 2048 ⁇ 2 - ⁇ , or any of the above Table 1.
- the N ⁇ value corresponding to a format generally refers to the length of the CP of a certain format, such as format A1 corresponding to The value of , specifically can be 288 ⁇ 2- ⁇ , and similarly, it can also be corresponding to any of the formats in Table 1 above value of .
- the M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format;
- the time domain lengths N ⁇ corresponding to the first format, the second format, and the third format are respectively n times the first value, and the lengths of the corresponding cyclic prefixes CP are respectively is n times the second value;
- the first format here is the above-mentioned format A1
- the first value is the value of N ⁇ corresponding to the format A1
- the second format is the above-mentioned format A2
- the first value is the N corresponding to the format A2
- the time domain length N ⁇ corresponding to the fourth format, the fifth format, the sixth format, and the seventh format are respectively n times of the third value, and the length of the corresponding cyclic prefix CP They are (2n+1) ⁇ 72 ⁇ 2- ⁇ , (4n+1) ⁇ 72 ⁇ 2- ⁇ , (6n+1) ⁇ 72 ⁇ 2- ⁇ , (12n+1) ⁇ 72 ⁇ 2- ⁇ ;
- the fourth format here is the above format B1
- the third value is the format B1
- the third value is the value of N ⁇ ;
- the fifth format is the above-mentioned format B2
- the corresponding time domain length N ⁇ is n times the fifth value, respectively, and the corresponding length of the cyclic prefix CP Keep the sixth value unchanged;
- the eighth format here is the above-mentioned format C0
- the fifth value is the value of N ⁇ corresponding to the format C0;
- the ninth format is the above-mentioned format C2
- the fifth value is the N ⁇ corresponding to the format C2 value of .
- guard interval Guard Time
- the above-mentioned first format can be the preamble sequence format A1 ' after the A1 enhancement here
- the above-mentioned second format can be the preamble sequence format A2' after the A2 enhancement here
- the above-mentioned third format can be the enhanced preamble sequence format A3' of A3 here
- the above-mentioned first value can be the N ⁇ value corresponding to A1, A2 and A3 respectively in the above-mentioned table 1 in the protocol
- the second value can be the protocol A1, A2 and A3 in the above table 1 respectively correspond to
- the above-mentioned fourth format, fifth format, sixth format and seventh format are respectively equivalent to B1', B2', B3', B4'here;
- the above-mentioned third value can be B1, B2, B3 and B4 respectively in the table The corresponding N ⁇ value;
- the value of is as the value in the extended table;
- Format the eighth, ninth format correspond to C0, C2 enhanced the C0 ', C2'; fifth value may be in agreement in the above Table 1 B1, B2, B3 and B4 respectively corresponding N ⁇ value;
- the sixth value can be The value of can be the value in Table 1 above.
- a new SCS (such as 240KHz, 480KHz, etc.) is introduced for PRACH: an optional embodiment of the present disclosure, a method for sending a random access preamble sequence, further comprising:
- the random access configuration information also includes at least one of the following parameters:
- the number of PRACH opportunities in the time domain in a PRACH slot is
- the original PRACH configuration table of FR2 in the protocol is as follows:
- Binding 0.25ms is divided into two parts, and 2 ⁇ -3 ( ⁇ >3) consecutive PRACH slots are respectively bound into a sub-block, which is a bound PRACH time slot;
- Number of PRACH slots within a 60kHz slot (the number of PRACH timeslots within 60KHZ) is changed to Number of Bundling PRACH slots within a 60kHz slot (the number of sub-blocks bound by PRACH timeslots within 60KHZ): Assuming the configuration is N, The selection rule is to select N Bundling PRACH slots from back to front within the corresponding 60kHz slot time domain length;
- Number of time-domain PRACH occasions within a PRACH slot (the number of time-domain PRACH occasions in a PRACH slot): changed to number of time-domain PRACH occasions within a Bundling PRACH slot (the number of PRACH occasions in a sub-block);
- PRACH duration (the number of symbols occupied in the PRACH time domain): all elements are enlarged by n times Guaranteed
- the method for sending a random access preamble sequence may further include:
- the number of symbols occupied in the PRACH time domain of each random access channel is: The number of symbols occupied by each random access channel PRACH time domain;
- the number of PRACH opportunities in the time domain in a PRACH slot is
- the number of PRACH opportunities in the time domain in a PRACH slot If it is less than 1, and the number of symbols included in the corresponding PRACH time domain is less than 14, the number of PRACH occasions is 1;
- the number of PRACH opportunities in the time domain in a PRACH slot greater than 1 and non-integer, the number of PRACH occasions is pair The resulting value is rounded down.
- the corresponding PRACH time domain includes the number of symbols If it exceeds 14, only the configuration with the number of PRACH time slots contained in the 60KHz time slot is 2, and the configuration with the value of 1 is removed; if the corresponding PRACH time domain contains the number of symbols Still less than 14, the value of the number of PRACH time slots contained in one 60KHz time slot remains unchanged.
- PRACH duration All elements are expanded by n times
- the reduced result is less than 1 and the corresponding PRACH duration is greater than 14, it means that the number of symbols occupied by the preamble is already greater than the 14 symbols of the slot, so the value of this parameter is meaningless at this time, marked as "-"
- the random access preamble sequence formats include M+L formats;
- the first M formats include: the first format, the second format, the third format, the fourth format format, fifth format, sixth format, seventh format, eighth format and ninth format;
- L is an integer greater than or equal to 1;
- time domain length N ⁇ corresponding to the first format, the second format, and the third format respectively is the first value
- the length of the corresponding cyclic prefix CP respectively is the second value
- the corresponding time domain length N ⁇ is the fifth value
- the corresponding length of the cyclic prefix CP is the sixth value.
- n A is a positive integer
- N ⁇ n B ⁇ 2048 ⁇ ⁇ 2 - ⁇ , where n B is a positive integer;
- n A , n B , and n C are all positive integers.
- Embodiment 1 Increase the number of time domain symbols for the first point (above 52.6GHz may introduce a new SCS)
- Option 1 For example, add A4: double the size of A2; add B5: double the size of B2; add C3: double the size of C0;
- Option 2 For example, add A4: add a format of 7 symbols; add B5: add a format of 7 symbols; add C3: add a format of 3 symbols;
- Embodiment 2 In view of the increase in the number of symbols occupied in the time domain of the preamble, the table of PRACH configuration is redesigned
- Option 1 Introduce a new SCS for PRACH, taking 240KHz as an example
- Bundling Divide 0.25ms into two parts, and bind consecutive 2 4-3 PRACH slots into a sub-block, which is a Bundling PRACH slot;
- Number of PRACH slots within a 60kHz slot is changed to Number of Bundling PRACH slots within a 60kHz slot;
- Number of time-domain PRACH occasions within a PRACH slot Change to number of time-domain PRACH occasions within a Bundling PRACH slot;
- PRACH duration all elements are expanded by n times Guaranteed
- the number of time-domain symbols of the preamble is increased by 2 times.
- PRACH duration All elements are expanded by a factor of 2
- the reduced result is less than 1 and the corresponding PRACH duration is greater than 14, it means that the number of symbols occupied by the preamble is already greater than the 14 symbols of the slot, so the value of this parameter is meaningless at this time, marked as "-";
- step 32 may include:
- Step 321 in a sub-block bound together by a plurality of PRACH time slots, determine the validity of the PRACH opportunity
- Step 322 Determine the time-frequency resource RO used for transmitting the random access preamble sequence on one transmit beam based on the valid PRACH opportunity and the preamble sequence format.
- the validity of the PRACH occasion is judged in the corresponding PRACH time slot (Bundling PRACH slot).
- step 33 may include:
- Step 331 after determining the available ROs, according to the configuration or the pre-configured number of transmit beams, determine whether to perform beam switching when sending ROs, if the number of beams configured in an RO is greater than 1, beam switching in the RO needs to be performed;
- Step 332 when the intra-RO beam switching needs to be performed, switch different beams and send a random access preamble sequence.
- the terminal determines whether to perform beam switching when sending ROs according to the configured or pre-configured number m of transmit beams. If m>1, it indicates that beam switching is required; the specific RO structure; The position in the RO where beam switching occurs; the specific beam switching sequence in the RO is as follows. The UE switches different beams to transmit msg1.
- the configuration of the above-mentioned random access preamble sequence format can be implemented independently, that is, the solution of only increasing the length of the PRACH time domain can be implemented independently;
- only beam switching within the RO may be performed, that is, the solution of beam switching within the RO may also be implemented independently;
- the schemes of increasing the time domain length of the PRACH and performing beam switching in the RO can also be combined together.
- the structure of the RO is as follows:
- the first time interval Gap used for beam switching is located at the beginning of each RO, and the first time interval Gap is used to satisfy the duration required for beam switching.
- the time domain structure of each RO is the same; or, an additional extra_CP is added on the basis of the original CP length of each RO, and the length of the extra_CP is not less than the beam switching time; or, an additional extra_CP is added on the basis of the original CP of the RO.
- An additional period of random signal the length of the time domain of the random signal is not less than the beam switching time; or, the first symbol of each RO is used for beam switching as a whole.
- the position where beam switching occurs in the RO is as follows:
- the RO is equally divided into m parts in the time domain according to the configured or pre-configured number of available beams m;
- the RO can be equally divided into m parts in the time domain, the first symbols of the remaining m-1 parts of the m beams except the first part are used for beam switching;
- the m' number of symbols as the remainder is included in the mth part, or the first m' parts are allocated one more symbol, and the first symbols of the m parts are all for beam switching.
- the position where beam switching occurs in the RO is as follows:
- the second time interval Gap is located at the head of the symbol in which beam switching occurs, and the remainder of the symbol is used to transmit the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located at the end of the symbol in which beam switching occurs, and the immediately following symbol is used to transmit the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting on the corresponding beam Cyclic prefix CP of the symbol set.
- the number of times the beams can be switched in one RO does not exceed n.
- a corresponding parameter is introduced in the high layer to indicate the number of beams used in one RO, and the number of beams is indicated by log 2 n bits;
- the random access process is triggered by PDCCH signaling, introduce a new information field in PDCCH format 1-0 or use reserved bits to indicate the number of beams used in an RO.
- the information field or reserved bits can be determined by log 2 n bits to indicate.
- the switching sequence of transmit beams in the same RO is as follows:
- the terminal detects the downlink synchronization block, and determines whether the actual RSRP measurement value of the synchronization block is greater than the RSRP threshold obtained from the system broadcast message.
- the beam corresponding to the synchronization block is used as the center beam;
- the terminal uses the PDCCH signaling to designate the beam corresponding to the synchronization block as the center beam.
- the above method may further include:
- the beams are switched according to the order of the synchronization block index corresponding to each beam from large to small or from small to large to send each part of the content of the RO.
- the UE does beam scanning in an RO:
- the number of symbols occupied by the preamble time domain is increased, and a larger SCS may be introduced for PRACH, which means that there will be more symbols available for PRACH transmission within the same time granularity. Therefore, a strong condition is provided for the UE to perform beam switching in one RO, so that beam scanning in one RO does not require the UE to perform too much enhancement;
- RO in this solution refers to the time-frequency resource used to transmit PRACH Msg1 on one or more specific transmit beams according to the configured PRACH preamble sequence format
- RO header structure an additional gap is reserved at the beginning of each RO for beam switching time (base station side), and the gap length should at least meet the time required for beam switching; it should be ensured that after adding the header GAP, when PRACH The slave length does not change on the domain, as shown in Figure 5, and the GT time is reduced accordingly:
- the gap can also be used for the listen before talk (LBT) gap in unlicensed frequency bands (including LBT duration + UL/DL switching duration).
- LBT listen before talk
- the first symbol is used in its entirety for beam switching; or,
- the last part of the symbol is used for beam switching, and the immediately following symbol is used for the CP of the following beam, as shown in FIG. 8 , the remaining resources for this symbol can be used for other enhancements depending on the implementation of the UE;
- the GAP is used for beam switching at the middle position of the changed symbol, and the remaining first half of the symbol is used for performance enhancement or other processing, which is reserved for the UE to implement, and the remaining second half of the symbol is used for sending the preamble on the corresponding beam.
- CP as shown in Figure 9, has high requirements on the capability of the UE;
- the number of beams in the same RO The number of times that the UE can switch beams in one RO should depend on the multiple of the number of preamble symbols in the first step; in order not to add too much burden to the UE, The number of beams that the UE can switch and use in the same RO cannot exceed n (if the UE capability is strong, it can exceed n), where n is the multiple of the expansion in the first step; in the same RO, the UE can use the transmission
- the number of beams can be obtained through higher layer/PDCCH order configuration or pre-configuration.
- Corresponding parameters are introduced in the high layer to indicate the number of beams used in an RO.
- the specific corresponding parameters can be represented by: log 2 n bits;
- the UE will use the receiving beam corresponding to the detection of the synchronization block (SS/PBCH Block, SSB) as the central transmitting beam of the UE, and then select the most central beam on both sides of the central beam according to the system configuration or the pre-configured number m of beams.
- the m-1 beams close to the center beam perform beam switching and transmit the same RO.
- the UE performs downlink SSB detection to determine whether the actual RSRP measurement value of the SSB is greater than the RSRP threshold obtained from the system broadcast message. If the judgment is true, the beam corresponding to the SSB is used as the center. beam;
- the UE uses PDCCH signaling to designate the beam corresponding to the SSB as the center beam;
- RO cannot be equally divided into m parts in the time domain, then the remaining m' symbols are included in the mth part, or one more symbol is allocated to the first m' parts;
- Embodiment 3 Random access process flow of the overall UE (the value in this embodiment only involves the sending and receiving of msg1)
- Step 1 After the UE receives the configuration information prach-ConfigurationIndex of the cell, it checks the PRACH configuration table to determine the specific PRACH configuration, including the specific preamble sequence format used, the number of ROs, the number of symbols contained, and the time domain location and other information ; This process needs to be carried out in conjunction with the preamble sequence format and the PRACH configuration table in the present disclosure;
- the specific location of the PRACH slot is determined according to the specific PRACH configuration parameters.
- the determination rules are as follows:
- N slots are continuously selected as the PRACH slot or N Bundling slots as the Bundling PRACH slot from back to front in terms of time sequence. (corresponding to the scheme 1 and scheme 2 of the PRACH configuration table design respectively)
- Step 2 Continue the mechanism of Rel-16 in the related art, and judge the validity of PRACH occasion in the corresponding PRACH slots (Bundling PRACH slot).
- Step 3 After the UE determines the available ROs, it determines whether to perform beam switching when sending ROs according to the configured or pre-configured number of transmit beams (three (3)), and if m>1, it indicates that beam switching is required;
- the specific RO structure can be any combination of the above methods
- the specific switching sequence of the beams in the RO can be selected according to the processing method of the base station for receiving msg1 (Type-1/2/3),
- the UE switches different beams to transmit msg1.
- the above-mentioned embodiment of the present disclosure proposes an improved scheme of the corresponding PRACH configuration table to adapt to the new PRACH SCS that may appear in 52.6GHz and the increase in the number of preamble symbols;
- Embodiments of the present disclosure also provide a method for receiving a random access preamble sequence, which is applied to a network device, and the method includes:
- Step 101 Send random access configuration information, where the number of time-domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value;
- Step 102 Receive the random access preamble sequence sent by the terminal on the time-frequency resource for sending the random access preamble sequence.
- step 102 may include:
- the network device If the corresponding receive beams of the network device can cover the transmit beams of m terminals and do not switch the receive beams, the network device combines all the preambles for detection after receiving the preambles from multiple different beams; or
- the network device only receives the preambles on part of the beams;
- the network equipment If the corresponding receiving beams of the network equipment cannot cover the transmitting beams of m terminals, but the network equipment switches the receiving beams, the network equipment first determines the central receiving beam according to the correlation between the RO resources of the detected preamble and the downlink transmitting beams. , select m-1 beams closest to the center beam to perform beam switching and receive the same RO; on the remaining m-1 beams, according to the synchronization block index corresponding to each beam, from large to small or from small to large order Switch beams to receive the remainder of the RO contents.
- the specific implementation process is as follows: the base station receives Msg1 (Type-1/2/3) according to the specific processing method, and the base station receives the Msg1 in three processing methods (the three methods should be configured according to specific scenarios and actual conditions) of):
- Type-1 If the corresponding receive beam of the base station is wide enough to cover the transmit beams of m UEs, and the receive beam is not switched, the base station will combine all the preambles after receiving the preambles from multiple different beams Perform detection, which can bring performance gains and reduce the impact of transmit and receive beams on inaccuracy compared to single beams
- Type-2 If the corresponding receiving beams of the base station are too narrow to cover the transmitting beams of m UEs, and the receiving beams are not switched, the base station may only receive msg1 on some beams, so this processing method can reduce the problem of UEs.
- Type-3 If the corresponding receiving beam of the base station is too narrow and cannot cover the transmitting beams of m UEs, but the base station switches the receiving beam, the base station first determines the center according to the correlation between the RO resource of the detected Preamble and the downlink transmitting beam.
- Receiving beams (but the premise is to ensure that the switching sequence of UE sending beams is the second case above, select m-1 beams closest to the center beam for beam switching, and receive the same RO; on the remaining m-1 beams, According to the SSB index corresponding to each beam, the beams are switched in an order from large to small or from small to large to receive the rest of the content of the RO, and the switching order can be kept the same as that of the UE.
- this embodiment is a network-side method corresponding to the above-mentioned terminal-side method, and all the implementation processes in the above-mentioned embodiments are applicable to the embodiments of the network-side method, and the same can also be achieved. technical effect.
- an embodiment of the present disclosure further provides a terminal 110 , and the terminal may include: a transceiver 111 , a processor 112 , and a memory 113 , where a program executable by the processor 112 is stored in the memory 113 ;
- the processor 112 executes the program, it realizes: receiving random access configuration information, the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; according to the preamble
- the sequence format determines the time-frequency resource for sending the random access preamble sequence; the random access preamble sequence is sent on the time-frequency resource.
- the random access preamble sequence format includes M formats; the time domain length corresponding to at least one of the M formats is n times the first preset value, and the length of the cyclic prefix CP is n times the second preset value, where n is a positive integer.
- the M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format;
- the time domain lengths N ⁇ corresponding to the first format, the second format, and the third format are respectively n times the first value, and the lengths of the corresponding cyclic prefixes CP are respectively respectively n times the second value;
- the time domain length N ⁇ corresponding to the fourth format, the fifth format, the sixth format, and the seventh format are respectively n times of the third value, and the length of the corresponding cyclic prefix CP They are (2n+1) ⁇ 72 ⁇ 2- ⁇ , (4n+1) ⁇ 72 ⁇ 2- ⁇ , (6n+1) ⁇ 72 ⁇ 2- ⁇ , (12n+1) ⁇ 72 ⁇ 2- ⁇ ;
- the corresponding time domain length N ⁇ is n times the fifth value, respectively, and the corresponding length of the cyclic prefix CP Leave the sixth value unchanged.
- the method for sending a random access preamble sequence further includes:
- the random access configuration information 2 ⁇ -3 consecutive physical random access channel PRACH time slots are bound into a sub-block, ⁇ 3; the random access configuration information also includes at least one of the following parameters:
- the number of PRACH opportunities in the time domain in a PRACH slot is
- the number of PRACH opportunities in the time domain in a PRACH slot is less than 1, and the number of symbols included in the corresponding PRACH time domain is less than 14, then the number of PRACH opportunities is 1;
- the number of PRACH opportunities in the time domain in a PRACH slot greater than 1 and non-integer, the number of PRACH occasions is pair The resulting value is rounded down.
- the number of PRACH time slots included in the basic granularity of the time domain is 2;
- the random access preamble sequence formats include M+L formats;
- the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, Seventh format, eighth format and ninth format;
- L is an integer greater than or equal to 1;
- time domain length N ⁇ corresponding to the first format, the second format, and the third format respectively is the first value
- the length of the corresponding cyclic prefix CP respectively is the second value
- the corresponding time domain length N ⁇ is the fifth value
- the corresponding length of the cyclic prefix CP is the sixth value.
- determine the time-frequency resource for sending the random access preamble sequence including:
- sending a random access preamble sequence on the time-frequency resource includes:
- the first time interval Gap used for beam switching is located at the beginning of each RO.
- each RO is the same; or,
- the first symbol of each RO is used in its entirety for beam switching.
- the second time interval Gap used for beam switching is located on the symbol where beam switching occurs.
- the second time interval Gap is located at the header of the symbol where beam switching occurs, and the remaining part of the symbol is used to send the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located at the end of the symbol where the beam switching occurs, and the immediately following symbol is used to transmit the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam
- the cyclic prefix CP of the set is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam.
- the number of times the beams can be switched in one RO does not exceed n.
- a corresponding parameter is introduced in the high layer to indicate the number of beams used in one RO, and the number of beams is indicated by log 2 n bits;
- a new information field is introduced in PDCCH format 1-0 or a reserved bit is used to indicate the number of beams used in one RO.
- the information field or reserved bit is determined by log 2 n bits to indicate.
- the RO is equally divided into m parts in the time domain according to the configured or pre-configured number m of available beams;
- the RO can be equally divided into m parts in the time domain, the first symbols of the remaining m-1 parts of the m beams except the first part are used for beam switching;
- the m' number of symbols as the remainder is included in the mth part, or the first m' parts are allocated one more symbol, and the first symbols of the m parts are all for beam switching.
- the switching sequence of transmit beams in the same RO is as follows:
- the terminal detects the downlink synchronization block, and determines whether the actual RSRP measurement value of the synchronization block is greater than the RSRP threshold obtained from the system broadcast message.
- the beam corresponding to the synchronization block is used as the center beam;
- the terminal uses the PDCCH signaling to designate the beam corresponding to the synchronization block as the center beam.
- the method further includes:
- the beams are switched according to the order of the synchronization block index corresponding to each beam from large to small or from small to large to send each part of the content of the RO.
- the communication device in this embodiment is a terminal corresponding to the method shown in FIG. 3 above, and the implementation manners in each of the above embodiments are applicable to this embodiment, and the same technical effect can also be achieved.
- the transceiver 111 and the memory 113, as well as the transceiver 111 and the processor 112 can be communicated and connected through a bus interface, the function of the processor 112 can also be realized by the transceiver 111, and the function of the transceiver 111 can also be realized by the processor 112 realized.
- an embodiment of the present disclosure further provides an apparatus 120 for sending a random access preamble sequence, which is applied to a terminal, and the apparatus includes:
- a transceiver module 121 configured to receive random access configuration information, where the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value
- a processing module 122 configured to determine the time-frequency resource for sending the random access preamble sequence according to the preamble sequence format
- the transceiver module 121 is further configured to send a random access preamble sequence on the time-frequency resource.
- the random access preamble sequence format includes M formats; the time domain length corresponding to at least one of the M formats is n times the first preset value, and the length of the cyclic prefix CP is n times the second preset value, where n is a positive integer.
- the M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format;
- the time domain lengths N ⁇ corresponding to the first format, the second format, and the third format are respectively n times the first value, and the lengths of the corresponding cyclic prefixes CP are respectively respectively n times the second value;
- the time domain length N ⁇ corresponding to the fourth format, the fifth format, the sixth format, and the seventh format are respectively n times of the third value, and the length of the corresponding cyclic prefix CP They are (2n+1) ⁇ 72 ⁇ 2- ⁇ , (4n+1) ⁇ 72 ⁇ 2- ⁇ , (6n+1) ⁇ 72 ⁇ 2- ⁇ , (12n+1) ⁇ 72 ⁇ 2- ⁇ ;
- the corresponding time domain length N ⁇ is n times the fifth value, respectively, and the corresponding length of the cyclic prefix CP Leave the sixth value unchanged.
- the method for sending a random access preamble sequence further includes:
- the random access configuration information 2 ⁇ -3 consecutive physical random access channel PRACH time slots are bound into a sub-block, ⁇ 3; the random access configuration information also includes at least one of the following parameters:
- the number of PRACH opportunities in the time domain in a PRACH slot is
- the number of PRACH opportunities in the time domain in a PRACH slot is less than 1, and the number of symbols included in the corresponding PRACH time domain is less than 14, then the number of PRACH opportunities is 1;
- the number of PRACH opportunities in the time domain in a PRACH slot greater than 1 and non-integer, the number of PRACH occasions is pair The resulting value is rounded down.
- the number of PRACH time slots included in the basic granularity of the time domain is 2;
- the random access preamble sequence formats include M+L formats;
- the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, Seventh format, eighth format and ninth format;
- L is an integer greater than or equal to 1;
- time domain length N ⁇ corresponding to the first format, the second format, and the third format respectively is the first value
- the length of the corresponding cyclic prefix CP respectively is the second value
- the corresponding time domain length N ⁇ is the fifth value
- the corresponding length of the cyclic prefix CP is the sixth value.
- determine the time-frequency resource for sending the random access preamble sequence including:
- sending a random access preamble sequence on the time-frequency resource includes:
- the first time interval Gap used for beam switching is located at the beginning of each RO.
- each RO is the same; or,
- the first symbol of each RO is used in its entirety for beam switching.
- the second time interval Gap used for beam switching is located on the symbol where beam switching occurs.
- the second time interval Gap is located at the header of the symbol where beam switching occurs, and the remaining part of the symbol is used to send the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located at the end of the symbol where the beam switching occurs, and the immediately following symbol is used to transmit the cyclic prefix CP of the symbol set on the corresponding beam; or,
- the second time interval Gap is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam
- the cyclic prefix CP of the set is located in the middle of the symbol where beam switching occurs, the part before the second time interval Gap is used for performance enhancement, and the part after the second time interval Gap is used for transmitting symbols on the corresponding beam.
- the number of times the beams can be switched in one RO does not exceed n.
- a corresponding parameter is introduced in the high layer to indicate the number of beams used in one RO, and the number of beams is indicated by log 2 n bits;
- a new information field is introduced in PDCCH format 1-0 or a reserved bit is used to indicate the number of beams used in one RO.
- the information field or reserved bit is determined by log 2 n bits to indicate.
- the RO is equally divided into m parts in the time domain according to the configured or pre-configured number m of available beams;
- the RO can be equally divided into m parts in the time domain, the first symbols of the remaining m-1 parts of the m beams except the first part are used for beam switching;
- the m' number of symbols as the remainder is included in the mth part, or the first m' parts are allocated one more symbol, and the first symbols of the m parts are all for beam switching.
- the switching sequence of transmit beams in the same RO is as follows:
- the terminal detects the downlink synchronization block, and determines whether the actual RSRP measurement value of the synchronization block is greater than the RSRP threshold obtained from the system broadcast message.
- the beam corresponding to the synchronization block is used as the center beam;
- the terminal uses the PDCCH signaling to designate the beam corresponding to the synchronization block as the center beam.
- the method further includes:
- the beams are switched according to the order of the synchronization block index corresponding to each beam from large to small or from small to large to send each part of the content of the RO.
- the device in this embodiment is a device corresponding to the method shown in FIG. 3 above, and the implementation manners in the above embodiments are all applicable to the embodiments of the device, and the same technical effect can also be achieved. It should be noted here that the above-mentioned device provided by the embodiment of the present disclosure can realize all the method steps realized by the above-mentioned method embodiment, and can achieve the same technical effect, and the same as the method embodiment in this embodiment is not repeated here. The parts and beneficial effects will be described in detail.
- An embodiment of the present disclosure further provides a network device, including: a transceiver, a processor, and a memory, where a program executable by the processor is stored in the memory; when the processor executes the program, the processor implements: sending a random access configuration information, the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; the random access preamble sequence.
- a network device including: a transceiver, a processor, and a memory, where a program executable by the processor is stored in the memory; when the processor executes the program, the processor implements: sending a random access configuration information, the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; the random access preamble sequence.
- the random access preamble sequence sent by the receiving terminal on the time-frequency resource for sending the random access preamble sequence may include:
- the network device If the corresponding receive beams of the network device can cover the transmit beams of m terminals and do not switch the receive beams, the network device combines all the preambles for detection after receiving the preambles from multiple different beams; or
- the network device only receives the preambles on part of the beams;
- the network equipment If the corresponding receiving beams of the network equipment cannot cover the transmitting beams of m terminals, but the network equipment switches the receiving beams, the network equipment first determines the central receiving beam according to the correlation between the RO resources of the detected preamble and the downlink transmitting beams. , select m-1 beams closest to the center beam to perform beam switching and receive the same RO; on the remaining m-1 beams, according to the synchronization block index corresponding to each beam, from large to small or from small to large order Switch beams to receive the remainder of the RO contents.
- a transceiver module configured to send random access configuration information, where the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; the receiving terminal sends the random access preamble sequence at the time-frequency The random access preamble sequence sent on the resource.
- the random access preamble sequence sent by the receiving terminal on the time-frequency resource for sending the random access preamble sequence may include:
- the network device If the corresponding receive beams of the network device can cover the transmit beams of m terminals and do not switch the receive beams, the network device combines all the preambles for detection after receiving the preambles from multiple different beams; or
- the network device only receives the preambles on part of the beams;
- the network equipment If the corresponding receiving beams of the network equipment cannot cover the transmitting beams of m terminals, but the network equipment switches the receiving beams, the network equipment first determines the central receiving beam according to the correlation between the RO resources of the detected preamble and the downlink transmitting beams. , select m-1 beams closest to the center beam to perform beam switching and receive the same RO; on the remaining m-1 beams, according to the synchronization block index corresponding to each beam, from large to small or from small to large order Switch beams to receive the remainder of the RO contents.
- Embodiments of the present disclosure also provide a processor-readable storage medium storing processor-executable instructions for causing the processor to execute the above-mentioned method, all the implementation manners in the above method embodiments are applicable to this embodiment, and the same technical effect can also be achieved.
- the disclosed apparatus and method may be implemented in other manners.
- the apparatus embodiments described above are only illustrative.
- the division of the units is only a logical function division. In actual implementation, there may be other division methods.
- multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
- the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
- the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
- each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
- the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
- the computer software product is stored in a storage medium, including several
- the instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present disclosure.
- the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .
- each component or each step can be decomposed and/or recombined.
- These disaggregations and/or recombinations should be considered equivalents of the present disclosure.
- the steps of performing the above-mentioned series of processes can naturally be performed in chronological order in the order described, but need not necessarily be performed in chronological order, and some steps can be performed in parallel or independently of each other.
- Those of ordinary skill in the art can understand all or any steps or components of the method and device of the present disclosure. , software, or a combination thereof, which can be implemented by those of ordinary skill in the art using their basic programming skills after reading the description of the present disclosure.
- the objects of the present disclosure can also be achieved by running a program or set of programs on any computing device.
- the computing device may be a known general purpose device. Therefore, the objects of the present disclosure can also be achieved merely by providing a program product containing program code for implementing the method or apparatus. That is, such a program product also constitutes the present disclosure, and a storage medium in which such a program product is stored also constitutes the present disclosure.
- the storage medium can be any known storage medium or any storage medium developed in the future.
- each component or each step can be decomposed and/or recombined. These disaggregations and/or recombinations should be considered equivalents of the present disclosure.
- the steps of executing the above-described series of processes can naturally be executed in chronological order in the order described, but need not necessarily be executed in chronological order. Certain steps may be performed in parallel or independently of each other.
- modules, units, and subunits can be implemented in one or more Application Specific Integrated Circuits (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSP Device, DSPD) ), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), general-purpose processor, controller, microcontroller, microprocessor, in other electronic units or combinations thereof.
- ASIC Application Specific Integrated Circuits
- DSP Digital Signal Processor
- DSP Device Digital Signal Processing Device
- DSPD Digital Signal Processing Device
- PLD Programmable Logic Device
- FPGA Field-Programmable Gate Array
- the technologies described in the embodiments of the present disclosure may be implemented through modules (eg, procedures, functions, etc.) that perform the functions described in the embodiments of the present disclosure.
- Software codes may be stored in memory and executed by a processor.
- the memory can be implemented in the processor or external to the processor.
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Abstract
本公开实施例提供了一种随机接入前导码序列的发送、接收方法、终端及网络设备。发送方法包括:接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;在所述时频资源上发送随机接入前导码序列。
Description
相关申请的交叉引用
本申请主张在2020年7月23日在中国提交的中国专利申请号No.202010718801.7的优先权,其全部内容通过引用包含于此。
本公开涉及通信技术领域,尤其涉及一种随机接入前导码序列的发送、接收方法、终端及网络设备。
在新无线(New Radio,NR)中,从物理层角度,如图1所示,4步随机接入过程包括:
步骤1:终端(user equipment,UE)在物理随机接入信道(physical random access channel,PRACH)上发送随机接入前导码(Preamble)序列(即消息1,Msg1);
步骤2:UE在物理下行控制信道(physical downlink control channel,PDCCH)/物理下行共享信道(physical downlink shared channel,PDSCH)上接收随机接入响应(random access response,RAR)消息(即消息2,Msg2);
步骤3:UE在物理上行共享信道(physical uplink shared channel,PUSCH)信道上发送消息3(Msg3);
步骤4:UE在PDSCH信道上接收竞争解决消息(即消息4,Msg4)。
在进行随机接入过程之前,终端通过系统广播消息获得SS/PBCH块(Synchronization Signal/PBCH Block,SSB)索引的集合、物理层时频资源、随机接入前导码序列格式和随机接入前导码序列集合的参数,然后UE根据所获得的信息,生成随机接入前导码序列,并在相应的物理层随机接入时频资源上发起随机接入。
基站针对PRACH进行检测,如果基站检测到前导码序列,则在PDCCH/PDSCH上反馈相应的随机接入响应(RAR)信息。终端在发送了随 机接入前导码序列之后,在一个RAR时间窗口内检测下行PDCCH/PDSCH上反馈的RAR信息,如果检测到了相应的RAR信息,则说明该UE发送的随机接入前导码序列被基站检测到。该RAR信息中还包含了该UE的上行定时提前调整量,该终端根据该调整量可以获得上行同步,进而可以发送上行资源调度请求消息,进行后续的数据传输。
相关技术中的FR2支持的前导码序列格式如下表1所示:
Preamble formats for L
RA∈{139,571,1151}and Δf
RA=15·2
μkHz where μ∈{0,1,2,3}.
表1
FR2的随机接入配置表格如下表2(Random access configurations for FR2 and unpaired spectrum)所示。
Random access configurations for FR2 and unpaired spectrum.
表2
根据小区配置的prach-ConfigurationIndex可以得到相应的前导格式、PRACH资源所在的无线帧,具体的子帧号、PRACH资源在RACH slot(时隙)中的起始符号、RACH时隙中时域PRACH occasion(时机)数目、PRACH时机的时域符号长度、以及一个时域粒度中PRACH时隙的数目;其中所说的时域粒度,在FR1下PRACH子载波间隔(subcarrier spacing,SCS)只支持15KHz或30KHz,在一个时域粒度也就是一个子帧中,当SCS=15KHz时,只有一个RACH时隙,当SCS=30KHz时,可以有1或2个RACH时隙。在FR2下,PRACH SCS支持60KHz或者120KHz,在一个时域粒度也就是0.25ms中,当SCS=60KHz时,只有一个RACH时隙,当SCS=120KHz时,在一个周期中可以有1或2个RACH时隙;如果在一个允许有两个PRACH时隙的周期中,配置PRACH时隙的数目值为1,则每个周期中第二个时隙作为PRACH时隙,若配置的PRACH时隙数目为2,则周期中的两个时隙都是PRACH时隙,如图2所示。
但是在获得相应的PRACH资源配置后,其中配置的PRACH时机是否有效还需要基于具体的帧结构进行判断,也就是说实际过程配置好的资源还需要根据实际帧结构的变化进行取舍,相应的判断条件如下:
对于频分复用(Frequency division duplex,FDD)模式,所有的PRACH时机都是有效的;
对于时分复用(Time division duplex,TDD)模式,如果UE没有收到TDD UL-DL-ConfigurationCommon,则在当前的PRACH时隙中,如果PRACH时机后面没有同步信号块(synchronization signal block,SSB),且与前面最 近的SSB末尾符号至少间隔N
gap个符号,则该PRACH时机有效,其中N
gap值可以参考标准中的相应表格;
对于TDD(Time division duplex)模式,如果UE收到了TDD UL-DL-ConfigurationCommon,若PRACH时机在UL(Uplink)符号上,且在当前的PRACH时隙中PRACH时机后面没有SSB,其与前面最近的SSB的末尾符号至少间隔N
gap个符号,且与前面最后的DL(Downlink)符号至少间隔N
gap个符号,则该PRACH时机有效,其中N
gap值可以参考标准中的相应表格。
在上述4步随机接入过程中,NR协议重点针对Msg1和Msg2过程中,基站的发送波束和接收波束进行了优化设计。
首先,基站通过系统广播消息将确定SSB与RACH时机(RACH occasion,RO)资源子集关联关系的参数通知终端(包括:SSB选择的参考信号接收功率(reference signal received power,RSRP)阈值),其中,一个RO资源子集由一个或者多个RO构成。
其次,UE进行下行SSB检测,判断SSB的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果判断成立,则使用该SSB关联的RO资源子集作为候选的Msg1的资源集合。
基站根据检测到前导码的RO资源和上述与下行发送波束的关联关系,在关联的发送波束上发送Msg2。
其中RO是指根据配置好的PRACH前导码序列格式在一个特定发送波束上用于传输PRACH Msg1的时频资源;
由于载频的提高,导致信号传播过程中能量衰减过大,保持相关技术中的前导码序列格式可能会导致覆盖降低,进而影响初始接入过程的可工作范围以及可靠性。此外,由于超高频段的波束相比原来FR1以及FR2会变得更窄,因此波束发送以及接收方向的轻微变化,都有可能造成收发波束无法对齐带来性能上的损失。
发明内容
本公开实施例提供了一种随机接入前导码序列的发送、接收方法、终端 及网络设备。通过增加前导码时域的符号数,来提升前导码的发送能量,通过给UE增加波束扫描发送PRACH的过程,来降低收发波束无法完全对齐对随机接入过程造成的影响。
为解决上述技术问题,本公开的实施例提供如下技术方案:
一种随机接入前导码序列的发送方法,应用于终端,所述方法包括:
接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;
根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;
在所述时频资源上发送随机接入前导码序列。
可选的,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀(Cyclic Prefix,CP)的长度为第二预设值的n倍,其中,n为正整数。
可选的,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;
第四格式、第五格式、第六格式、第七格式分别对应的时域长度N
μ分别为第三值的n倍,对应的循环前缀CP的长度
分别为(2n+1)·72κ·2
-μ、(4n+1)·72κ·2
-μ、(6n+1)·72κ·2
-μ、(12n+1)·72κ·2
-μ;
其中,κ=T
s/T
c=64,T
s=1/(Δf
ref·N
f,ref),T
c=1/(Δf
max·N
f),Δf
max=480·10
3Hz,N
f=4096,Δf
ref=15·10
3Hz,N
f,ref=2048;μ∈{2,3,[4]…};
可选的,所述随机接入配置信息中,连续2
μ-3个物理随机接入信道PRACH时隙绑定为一个子块,μ≥3;所述随机接入配置信息还包括以下至少一种参数:
时域基本粒度内的PRACH时隙绑定的子块的数量;
一个子块中PRACH时机的数目;
可选的,所述随机接入前导码序列格式包括M+L种格式;前M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;L为大于或者等于1的整数;
第M+L3种格式对应的时域长度N
μ=n
C·2048κ·2
-μ,循环前缀CP的 长度
其中n
C为正整数;L3为不同的值时,对应的n
C不同,L1、L2、L3表示以第M种格式开始增加的序号值,L1+L2+L3小于或者等于L。
可选的,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源,包括:
在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;
基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
可选的,在所述时频资源上发送随机接入前导码序列,包括:
确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换;
需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
可选的,用于波束切换的第一时间间隔Gap位于每个RO的开头。
可选的,每个RO的时域结构相同;或者,
在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不小于波束切换的时间;或者,
在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不小于波束切换的时间;或者,
每个RO的第一个符号整体用于波束切换。
可选的,用于波束切换的第二时间间隔Gap位于发生波束切换的符号上。
可选的,所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部分用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应波束上发送符号集合的循环前缀CP。
可选的,在一个RO内可以切换波束的次数,不超过n。
可选的,如果随机接入过程是由高层触发,则在高层中引入相应参数,用于指示一个RO内使用波束数,波束数由log
2n比特来指示;
如果随机接入过程是由PDCCH信令触发,则在PDCCH format 1-0中引入新的信息域或者利用预留比特来指示一个RO内使用的波束数,该信息域或者预留比特由log
2n比特来指示。
可选的,同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份;
如果RO在时域上能够均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;
如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号,将m份的第一个符号均用于波束切换。
可选的,同一RO内发送波束的切换顺序包括:
如果每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送同一RO。
可选的,如果随机接入过程是由高层信令触发,则终端进行下行同步块的检测,判断同步块的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果大于,则使用该同步块所对应波束作为中心波束;
如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
可选的,配置了m个波束后,还包括:
按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换,在波束发送该RO的每一部分内容。
本公开的实施例还提供一种随机接入前导码序列的接收方法,应用于网络设备,所述方法包括:
发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;
接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
可选的,接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列,包括:
如果网络设备相应的接收波束可以覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备在收到来自多个不同波束上的前导码后,将所有前导码合并进行检测;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备只收到部分波束上的前导码;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,但是网络设备进行接收波束的切换,则网络设备先根据检测到前导码的RO资源与下行发送波束的关联关系,先确定中心接收波束,选择最靠近中心波束的m-1个波束来进行波束的切换,接收同一RO;在其余m-1个波束上,按照每个波束对应同步块索引,从大到小或者从小到大的顺序进行切换波束接收该RO的余下部分内容。
本公开的实施例还提供一种终端,包括:收发机,处理器,存储器,所述存储器上存有所述处理器可执行的程序;所述处理器执行所述程序时实现:接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;在所述时频资源上发送随机接入前导码序列。
可选的,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀CP的长度为第二预设值的n倍,其中,n为正整数。
可选的,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;
第四格式、第五格式、第六格式、第七格式分别对应的时域长度N
μ分别为第三值的n倍,对应的循环前缀CP的长度
分别为(2n+1)·72κ·2
-μ、 (4n+1)·72κ·2
-μ、(6n+1)·72κ·2
-μ、(12n+1)·72κ·2
-μ;
其中,κ=T
s/T
c=64,T
s=1/(Δf
ref·N
f,ref),T
c=1/(Δf
max·N
f),Δf
max=480·10
3Hz,N
f=4096,Δf
ref=15·10
3Hz,N
f,ref=2048;μ∈{2,3,[4]…};
可选的,所述处理器还用于:所述随机接入配置信息中,连续2
μ-3个物理随机接入信道PRACH时隙绑定为一个子块,μ≥3;所述随机接入配置信息还包括以下至少一种参数:
时域基本粒度内的PRACH时隙绑定的子块的数量;
一个子块中PRACH时机的数目;
可选的,所述随机接入前导码序列格式包括M+L种格式;前M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;L为大于或者等于1的整数;
第M+L3种格式对应的时域长度N
μ=n
C·2048κ·2
-μ,循环前缀CP的长度
其中n
C为正整数;L3为不同的值时,对应的n
C不同,L1、L2、L3表示以第M种格式开始增加的序号值,L1+L2+L3小于或者等于L。
可选的,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源,包括:
在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;
基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
可选的,在所述时频资源上发送随机接入前导码序列,包括:
确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换;
需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
可选的,用于波束切换的第一时间间隔Gap位于每个RO的开头。
可选的,每个RO的时域结构相同;或者,
在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不小于波束切换的时间;或者,
在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不 小于波束切换的时间;或者,
每个RO的第一个符号整体用于波束切换。
可选的,用于波束切换的第二时间间隔Gap位于发生波束切换的符号上。
可选的,所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部分用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应波束上发送符号集合的循环前缀CP。
可选的,同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;
如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号。
可选的,同一RO内发送波束的切换顺序如下:
如果每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送同一RO。
可选的,如果随机接入过程是由高层信令触发,则终端进行下行同步块的检测,判断同步块的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果大于,则使用该同步块所对应波束作为中心波束;
如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
可选的,配置了m个波束后,所述处理器还用于按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换,在波束发送该RO的每一部分内容。
本公开的实施例还提供一种随机接入前导码序列的发送装置,应用于终 端,所述装置包括:
收发模块,用于接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;
处理模块,用于根据根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;
所述收发模块还用于在所述时频资源上发送随机接入前导码序列。
本公开的实施例还提供一种网络设备,包括:收发机,处理器,存储器,所述存储器上存有所述处理器可执行的程序;所述处理器执行所述程序时实现:发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
本公开的实施例还提供一种随机接入前导码序列的接收装置,应用于网络设备,包括:
收发模块,用于发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
本公开的实施例还提供一种处理器可读存储介质,所述处理器可读存储介质存储有处理器可执行指令,所述处理器可执行指令用于使所述处理器执行如上所述的方法。
本公开实施例的有益效果是:
本公开的上述实施例,通过接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;在所述时频资源上发送随机接入前导码序列。通过增加前导码时域的符号数,来提升前导码的发送能量,此外,通过给终端增加波束扫描发送PRACH的过程,来降低收发波束无法完全对齐对随机接入过程造成的影响。
图1为4步随机接入过程方法流程示意图;
图2是RO(RACH occasion)配置示意图;
图3是本公开的随机接入前导码序列的发送方法示意图;
图4为本公开的实施例中240KHz的PRACH配置映射规则示意图;
图5为本公开的实施例中RO头结构的示意图;
图6为本公开的实施例中在一个RO初始位置进行波束切换示意图;
图7为本公开的实施例中,在一个RO内进行一次波束切换示意图;
图8为本公开的实施例中,在一个RO内进行一次波束切换示意图;
图9为本公开的实施例中,在一个RO内进行一次波束切换示意图;
图10为本公开的实施例中,RO内可做波束切换的格式与相关技术中的RO格式对比示意图;
图11为本公开的实施例终端的架构示意图;
图12为本公开的实施例随机接入前导码序列的发送装置的模块示意图。
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例,然而应当理解,可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反,提供这些实施例是为了能够更透彻地理解本公开,并且能够将本公开的范围完整的传达给本领域的技术人员。
如图3所示,本公开的实施例提供一种随机接入前导码序列的发送方法,应用于终端,所述方法包括:
步骤31,接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;
步骤32,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;
步骤33,在所述时频资源上发送随机接入前导码序列。
该实施例中,预设值可以是上述表1中的各前导码序列格式分别对应的时域符号数,通过增加不同前导码序列格式时域占用符号数,来提升发送能量提升覆盖;对于前导码序列格式时域符号数增加带来的影响,也需要对相关技术中的PRACH配置表格进行重新设计以适应新的结构;由于前导码时 域符号数的增加,为在一个RO内进行多个波束切换创造了条件,因此可以在不同波束上发送同一个RO,并且对于波束切换需要相应的方案设计。
终端的随机接入过程中,Msg1的收发过程中,具体可以包括:
UE收到小区的配置信息prach-Configuration Index后,查PRACH配置表格,确定具体的PRACH配置,包括具体使用的前导码序列格式,RO的个数、每个RO占用的符号数以时域位置等信息,本公开的实施例中,提出新增前导码序列格式,同时需要基于新增的前导码序列格式设计更新相应PRACH配置表格中具体的配置信息;
方案一:本公开的一可选的实施例中,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀CP的长度为第二预设值的n倍,其中,n为正整数。这里的第一预设值泛指某一种格式中时域长度,比如格式A1对应的N
μ的值,具体可以为2·2048κ·2
-μ,同样的,也可以是上述表1中任一种格式对应的N
μ值;这里的第二预设值泛指某一种格式的CP的长度,比如格式A1对应的
的值,具体可以为288κ·2
-μ,同样的,也可以是上述表1中的任一种格式对应的
的值。
可选的,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;
其中,第一格式、第二格式、第三格式分别对应的时域长度N
μ分别为第一值的n倍,分别对应的循环前缀CP的长度
为第二值的n倍;这里的第一格式为上述格式A1时,第一值为格式A1对应的N
μ的值;第二格式为上述格式A2时,第一值为格式A2对应的N
μ的值;第三格式为上述格式A3时,第一值为格式A3对应的N
μ的值;同样的,第二值分别可以是上述格式A1、A2、A3分别对应的
第四格式、第五格式、第六格式、第七格式分别对应的时域长度N
μ分别为第三值的n倍,对应的循环前缀CP的长度
分别为(2n+1)·72κ·2
-μ、(4n+1)·72κ·2
-μ、(6n+1)·72κ·2
-μ、(12n+1)·72κ·2
-μ;其中,κ=T
s/T
c=64,T
s=1/(Δf
ref·N
f,ref),T
c=1/(Δf
max·N
f),Δf
max=480·10
3Hz,N
f=4096,Δf
ref=15·10
3Hz,N
f,ref=2048;μ∈{2,3,[4]…};这里的第四格式为上述格式B1时,第三值为格 式B1对应的N
μ的值;第五格式为上述格式B2时,第三值为格式B2对应的N
μ的值;第六格式为上述格式B3时,第三值为格式B3对应的N
μ的值;第七格式为上述格式B4时,第三值为格式B4对应的N
μ的值;同样的,B1、B2、B3以及B4的第五值分别可以是(2n+1)·72κ·2
-μ、(4n+1)·72κ·2
-μ、(6n+1)·72κ·2
-μ、(12n+1)·72κ·2
-μ;
第八格式以及第九格式,对应的时域长度N
μ分别为第五值的n倍,分别对应的循环前缀CP的长度
保持第六值不变;这里的第八格式为上述格式C0时,第五值为格式C0对应的N
μ的值;第九格式为上述格式C2时,第五值为格式C2对应的N
μ的值。
具体的,增加前导码时域符号数,尽量保证每个格式对应的GT:Guard Time(保护间隔)不发生变化,不改变相关技术中的标准中对于传输距离的要求;
通过成倍数地增加每个前导码序列格式占用的时域符号数,提高能量进而增加PRACH覆盖(基于SCS=15,30,60,120KHz的前导码序列格式表格),其中N
μ表示每个前导码序列格式时域长度(μ与SCS相关联),
表示当前前导码序列格式的CP(循环前缀)长度;
结合上述表1,对于前导码序列格式A1/A2/A3增强,如果N
μ扩大为原来的n倍,则相应的
也扩大为原来的n倍即可;这里,上述第一格式可以是这里的A1增强后的前导码序列格式A1’,上述第二格式可以是这里的A2增强后的前导码序列格式A2’,上述第三格式可以是这里的A3增强后的前导码序列格式A3’;上述的第一值可以是协议中上述表1中A1、A2以及A3分别对应的N
μ值;第二值可以是协议中上述表1中的A1、A2以及A3分别对应的
对于前导码序列格式C0/C2增强,如果N
μ扩大为原来的n倍,相应的
保持原有的长度不需要发生改变;其中n为正整数。上述第八格式、第九格式分别相当于这里的C0、C2增强后的C0’、C2’;第五值可以是协议中上述表1中B1、B2、B3以及B4分别对应的N
μ值;第六值可以是
的值可以是上述表1中的数值。
基于上述方案一,针对PRACH引入新的SCS(如240KHz,480KHz等):本公开的一可选的实施例,随机接入前导码序列的发送方法,还包括:
随机接入配置信息中,将连续2
μ-3个物理随机接入信道PRACH时隙绑定为一个子块,μ≥3;
所述随机接入配置信息还包括以下至少一种参数:
时域基本粒度(60KHZ时隙)内的PRACH时隙绑定的子块的数量;
一个子块中PRACH时机的数目;
这里,具体的,基于上述方案一,协议中FR2的PRACH configuration原表格如下:
假设第一步中增加前导码时域符号数为原来的n倍。通过修改相关技术中的表格中的参数定义,以240KHz为例,如图4所示:
绑定:将0.25ms分为两部分,连续2
μ-3(μ>3)个PRACH slot分别绑定为一个子块,该子块为一个绑定的PRACH时隙;
Number of PRACH slots within a 60kHz slot(60KHZ内的PRACH时隙的数量)改为Number of Bundling PRACH slots within a 60kHz slot(60KHZ内的PRACH时隙绑定的子块的数量):假设配置为N,选择规则为相应60kHz slot时域长度内,从后向前选择N个Bundling PRACH slot;
Number of time-domain PRACH occasions within a PRACH slot(一个PRACH时隙中时域PRACH时机的数目):改为number of time-domain PRACH occasions within a Bundling PRACH slot(一个子块中PRACH时机的数目);
其余配置参数不变。
基于上述方案一,如果对于上述52.6GHz,没有为PRACH引入新的SCS,本公开的一可选的实施例中,随机接入前导码序列的发送方法,还可以包括:
可选的,对于时域基本粒度(60KHz时隙)内包含的PRACH时隙的数 目,如果相应的PRACH时域包含符号数
超过了14,则只保留60KHz时隙内包含PRACH时隙的数目为2的配置,去除该值为1的配置;如果相应的PRACH时域包含符号数
仍小于14,则一个60KHz时隙内包含的PRACH时隙的数目的值保持不变。
这里,具体的,假设第一步中增加前导码时域符号数为原来的n倍。
如果缩小后的结果小于1,且相应的PRACH duration小于14,此时结果取1
如果缩小后的结果小于1,且相应的PRACH duration大于14,此时意味着preamble占用的符号数已经大于slot的14个符号,所以此时该参数的取值无意义,标注为“-”
如果缩小后的结果大于1且非整数,则向下取整;
Number of PRACH slots within a 60kHz slot:
如果相应的PRACH duration扩大后的结果超过了14,则只保留Number of PRACH slots within a 60kHz slot值为2的配置,去除该值为1的相应配置;
如果相应的PRACH duration扩大后的结果仍小于14,则Number of PRACH slots within a 60kHz slot的值不需要进行修改;
其余配置参数不变。
方案二,本公开的一可选的实施例中,所述随机接入前导码序列格式包括M+L种格式;前M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;L为大于或者等于1的整数;
第M+L3种格式对应的时域长度N
μ=n
C·2048κ·2
-μ,循环前缀CP的长度
其中n
C为正整数;L3为不同的值时,对应的n
C不同,L1、L2、L3表示以第M种格式开始增加的序号值,L1+L2+L3小于或者等于L。
这里,具体的,为A、B、C三种format引入新的preamble长度(基于SCS=15,30,60,120KHz的Preamble formats表格):
其中n
A为正整数;
其中n
A、n
B、n
C均为正整数。
一种具体的实现实例:
实施例1:针对第一点增加时域符号数(above 52.6GHz有可能引入新的SCS)
方案一:举例新增A4:将A2整体扩大两倍;新增B5:将B2整体扩大两倍;新增C3:将C0扩大两倍;
方案二:举例新增A4:增加7个符号的format;新增B5:增加7个符号的format;新增C3:增加3个符号的format;
另一种具体的实现实例:
实施例2:针对前导码时域占用符号数的增多,重新设计PRACH配置的表格
方案一:针对PRACH引入新的SCS,以240KHz为例
Bundling:将0.25ms分为两部分,连续的2
4-3个PRACH slot分别绑定为一个子块,该子块为一个Bundling PRACH slot;
Number of PRACH slots within a 60kHz slot改为Number of Bundling PRACH slots within a 60kHz slot;
Number of time-domain PRACH occasions within a PRACH slot:改为number of time-domain PRACH occasions within a Bundling PRACH slot;
其余配置参数不变。
方案二:如果对于上述52.6GHz,没有为PRACH引入新的SCS
假设第一步中增加前导码时域符号数为原来的2倍。
如果缩小后的结果小于1,且相应的PRACH duration小于14,此时结果取1;
如果缩小后的结果小于1,且相应的PRACH duration大于14,此时意味着preamble占用的符号数已经大于slot的14个符号,所以此时该参数的取值无意义,标注为“-”;
如果缩小后的结果大于1且非整数,则向下取整;
Number of PRACH slots within a 60kHz slot:
如果相应的PRACH duration扩大后的结果超过了14,则只保留Number of PRACH slots within a 60kHz slot值为2的配置,去除该值为1的相应配置;
如果相应的PRACH duration扩大后的结果仍小于14,则Number of PRACH slots within a 60kHz slot的值不需要进行修改;
其余配置参数不变。
举例如下表:
本公开的一可选的实施例中,步骤32可以包括:
步骤321,在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;
步骤322,基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
这里,在相应的PRACH时隙(Bundling PRACH slot)中判断PRACH occasion的有效性。
本公开的可选的实施例中,步骤33可以包括:
步骤331,确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换,如果一个RO内配置波束个数大于1,需要进行RO内波束切换;
步骤332,需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
这里,终端确定可使用的RO后,根据配置或者预配置的发送波束个数m,来确定是否在发送RO时进行波束切换,如果m>1说明需要进行波束切换;具体的RO结构;具体在RO内发生波束切换的位置;具体的RO内波束的切换顺序,如下所述。UE切换不同波束来发送msg1。
本公开的实施例中,上述所述随机接入前导码序列格式的配置可以独立实现,即只增加PRACH时域长度的方案可以独立实现;
本公开的实施例中,也可以只进行RO内波束切换,即在RO内波束切换的方案也可以独立实现;
本公开的实施例中,增加PRACH的时域长度又在RO内进行波束切换的方案结合在一起,也可以实现。
本公开的一可选的实施例中,RO的结构如下:
用于波束切换的第一时间间隔Gap位于每个RO的开头,第一时间间隔Gap用于满足波束切换所需的时长。
可选的,每个RO的时域结构相同;或者,在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不小于波束切换的时间;或者,在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不小于波束切换的时间;或者,每个RO的第一个符号整体用于波束切换。
本公开的一可选的实施例中,在RO内发生波束切换的位置如下:
同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份;
如果RO在时域上能够均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;
如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号,将m份的第一个符号均用于波束切换。
本公开的一可选的实施例中,在RO内发生波束切换的位置如下:
用于波束切换的第二时间间隔Gap位于发生波束切换的符号上:
所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部分用于在相应的波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应的波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应的波束上发送符号集合的循环前缀CP。
可选的,在一个RO内可以切换波束的次数,不超过n。
可选的,如果随机接入过程是由高层触发,则在高层中引入相应参数,用于指示一个RO内使用波束数,波束数由log
2n比特来指示;
如果随机接入过程是由PDCCH信令触发,则在PDCCH format 1-0中引入新的信息域或者利用预留比特来指示一个RO内使用的波束数,该信息域或者预留比特可以由log
2n比特来指示。
本公开的一可选的实施例中,同一RO内发送波束的切换顺序如下:
假设每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送同一RO。
可选的,如果随机接入过程是由高层信令触发,则终端进行下行同步块的检测,判断同步块的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果成立,则使用该同步块所对应波束作为中心波束;
如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
可选的,确定了m个波束后,上述方法还可以包括:
按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换波束发送该RO的每一部分内容。
该实施例中,关于是否在发送RO时进行波束切换具体方案设计如下:
UE在一个RO中做波束扫描:
由于为了增强PRACH的覆盖,增加了前导码时域占用的符号数,并且可能会为PRACH引入更大的SCS,也就意味着相同时间粒度内会存在更多的可用于PRACH传输的符号。因此为UE在一个RO内进行波束切换提供了有力条件,使得在一个RO内进行波束扫描不再需要UE进行过多的增强;
本方案中的RO是指根据配置好的的PRACH前导码序列格式在一个或多个特定发送波束上用于传输PRACH Msg1的时频资源;
(1)RO头结构:每个RO开头额外预留一段Gap,用于波束切换时间(基站侧),Gap长度应该至少能够满足波束切换所需的时长;应该保证再增加头GAP后,PRACH时域上从长度不发生变化,如图5所示,相应减少GT时间:
此外该Gap也可以用于非授权频段的先听后说(listen before talk,LBT)gap(包括LBT时长+UL/DL切换时长),如果用于非授权频段Gap的长度也应该满足不小于LBT时长加上UL/DL切换所需的时间之和,具体如图6所示;
1):统一标准的Fixed_Gap,该值可以满足波束切换所需的最大时间,这 种方式的RO时域结构统一,比较规整,处理简单;或,
2):在RO的原CP长度基础上增加额外的extra_CP,由于RO时域初始阶段可能用于波束切换,因此需要extra_CP的长度不小于波束切换的时间;或,
3):在RO的原CP基础上增加额外的一段随机信号,由于RO时域初始阶段可能用于波束切换,因此需要该随机信号时域的长度不小于波束切换的时间;或,
4):第一个符号整体用于波束切换;或,
5):无需额外预留Gap,相关技术中的标准中RO之间的预留的Gap已经可以满足不同RO的波束切换要求。
(2)RO内发生波束切换时的符号结构:对于在RO中间进行波束切换的,牺牲一个前导码符号来进行切换波束,其中该符号的前一部分用作波束切换,余下部分用作后面前导码符号的CP,如图7所示,属于比较一般常见的做法;
或者,该符号的最后部分用作波束的切换,紧邻的后一个符号用于后面波束的CP,如图8所示,对于该符号余下的资源可以用于其他增强取决于UE的实现;
或者,在改符号的中间位置流出GAP用作波束的切换,余下的前半符号部分用作性能的增强或者其他处理,留个UE实现,余下的后半符号部分用作相应波束上发送前导码的CP,如图9所示,对UE的能力要求较高;
同样需要保证RO内可做波束切换格式与相关技术中的格式的PRACH时域长度保持相同,如图10所示:
(3)同一RO内的波束个数:对于UE在一个RO内可以切换波束的次数,具体的应该取决于第一步中前导码符号数扩大的倍数;为了不给UE增加过多的负担,限制UE在同一RO内可以切换使用的波束的个数不能超过n(如果UE能力较强可以超过n),其中n为第一步中扩大的倍数;具体的同一RO内,UE可采用的发送波束数可以通过高层/PDCCH顺序配置或预配置来获得。
在高层中引入相应参数,用于指示一个RO内使用波束数,具体的相应 参数可以由:log
2n bits来表示;
在PDCCH format 1-0中引入新的信息域或者利用预留比特来指示一个RO内使用的波束数,该信息域或者预留比特可以由log
2n bits来表示;
(4)同一RO内UE发送波束的切换顺序:假设每个RO配置了m个波束其中m<=n;
UE将使用检测到同步块(SS/PBCH Block,SSB)时所对应的接收波束作为该UE的中心发送波束,然后根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送同一RO。
如果随机接入过程是由高层信令触发,那么UE进行下行SSB检测,判断SSB的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果判断成立,则使用该SSB所对应波束作为中心波束;
如果随机接入过程是由PDCCH信令触发,那么UE使用PDCCH信令指定SSB对应的波束作为中心波束;
确定了m个波束后:
1):按照每个波束对应SSB索引的从大到小或者从小到大的顺序进行切换波束发送该RO的每一部分内容;
2):首先在中心波束上进行发送,然后在其余m-1个波束上,按照每个波束对应SSB标识索引,从大到小或者从小到大的顺序进行切换波束发送该RO的每一部分内容(该方案主要是为了基站可以确定第一个接收的波束,因为对于UE在中心波束上发送Msg1与相关技术中的R16协议内容是相同的,主要用于基站在接收Msg1时也要进行波束切换的场景);
(5)同一RO内用于波束切换的前导码符号位置的确定:根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份,除了第一份的首个前导码符号不需要特殊处理外,其余所有m-1份的第一个前导码符号均用于波束切换。
如果RO在时域上无法等分为m份,那么余下的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号;
一种具体的实现实例中,
实施例3:整体UE的随机接入过程流程(本实施例值仅涉及msg1收发,)
步骤1:UE收到小区的配置信息prach-ConfigurationIndex后,查PRACH配置表格,确定具体PRACH配置,包括具体使用的前导码序列格式,RO的个数,包含的符号数以及时域位置等等信息;此过程需要联合本公开中的前导码序列格式以及PRACH配置表格来进行;
根据具体PRACH配置参数,来确定PRACH slot的具体位置,确定规则如下:
在配置的每个时域粒度(slot number)中,在时序上从后向前连续选择N个slots作为PRACH slot或者N个Bundling slots作为Bundling PRACH slot。(分别对应PRACH配置表格设计的方案一和方案二)
步骤2:延续相关技术中的Rel-16的机制,在相应的PRACH slots(Bundling PRACH slot)中判断PRACH occasion的有效性即可
步骤3:UE确定可使用的RO后,根据配置或者预配置的发送波束个数(三(3)),来确定是否在发送RO时进行波束切换,如果m>1说明需要进行波束切换;
具体的RO结构,可以是上述各个方式的任意组合;
具体在RO内发生波束切换的位置,如上所述;
具体的RO内波束的切换顺序,如上所述,两种方式可以根据基站接收msg1的处理方式进行选择(Type-1/2/3),
UE切换不同波束来发送msg1。
本公开的上述实施例,通过增加了前导码的时域符号数,增加了发送的能量,可以提升覆盖;
本公开的上述实施例,提出相应PRACH配置表格的改进方案,适应52.6GHz可能出现的新PRACH SCS以及前导码符号数增加的情况;
本公开的上述实施例,提出了通过在多个波束上发送同一个RO,降低波束不能对齐造成的影响,并能提升力PRACH的覆盖;
本公开的上述实施例,由于前导码时域符号数的增加,在同一个RO内进行切换不需要终端具有很强的能力,或者可以完全不用要求提升相关技术中的终端的能力标准,就可以做到RO内进行波束切换的发送。
本公开的实施例还提供一种随机接入前导码序列的接收方法,应用于网络设备,所述方法包括:
步骤101,发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;
步骤102,接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
可选的,步骤102可以包括:
如果网络设备相应的接收波束可以覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备在收到来自多个不同波束上的前导码后,将所有前导码合并进行检测;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备只收到部分波束上的前导码;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,但是网络设备进行接收波束的切换,则网络设备先根据检测到前导码的RO资源与下行发送波束的关联关系,先确定中心接收波束,选择最靠近中心波束的m-1个波束来进行波束的切换,接收同一RO;在其余m-1个波束上,按照每个波束对应同步块索引,从大到小或者从小到大的顺序进行切换波束接收该RO的余下部分内容。
具体的实现过程如下:基站根据具体处理方式来进行接收Msg1(Type-1/2/3),基站在收到Msg1之后的三种处理方式(三种方式应该是根据具体场景和实际情况配置好的):
Type-1:如果基站相应的接收波束较宽可以覆盖m个UE的发送波束,且不进行接收波束的切换,则基站在收到来自多个不同波束上的前导码后,将所有前导码合并进行检测,这样可以带来性能增益,相比于单波束,降低收发波束对不准造成的影响
Type-2:如果基站相应的接收波束较窄不能覆盖m个UE的发送波束,且不进行接收波束的切换,则基站可能只收到部分波束上的msg1,那么这种处理方式可以降低由于UE和基站之间波束无法对齐的可能性;相比原来UE只采用一个波束来发送同一个RO,如果该发送波束与基站的接收波束发生了 偏离,那么整个RO都无法被基站接收到;但是通过利用多个波束来发送同一RO降低这种情况出现的可能性能,增加了PRACH的鲁棒性,更能适应高频段波束变窄的场景;
Type-3:如果基站相应的接收波束较窄不能覆盖m个UE的发送波束,但是基站进行接收波束的切换,则基站先根据检测到Preamble的RO资源与下行发送波束的关联关系,先确定中心接收波束(但是前提是保证UE发送波束的切换顺序为上述第二种情况,选择最靠近中心波束的m-1个波束来进行波束的切换,接收同一RO;在其余m-1个波束上,按照每个波束对应SSB索引,从大到小或者从小到大的顺序进行切换波束接收该RO的余下部分内容,切换顺序与UE保持相同即可。
需要说明的是,该实施例是与上述终端侧的方法相对应的网络侧的方法,上述实施例中的所有实现过程,均适用于该网络侧的方法的实施例中,也能达到相同的技术效果。
如图11所示,本公开的实施例还提供一种终端110,该终端可以包括:收发机111,处理器112,存储器113,所述存储器113上存有所述处理器112可执行的程序;所述处理器112执行所述程序时实现:接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;在所述时频资源上发送随机接入前导码序列。
可选的,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀CP的长度为第二预设值的n倍,其中,n为正整数。
可选的,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;
第四格式、第五格式、第六格式、第七格式分别对应的时域长度N
μ分别为第三值的n倍,对应的循环前缀CP的长度
分别为(2n+1)·72κ·2
-μ、(4n+1)·72κ·2
-μ、(6n+1)·72κ·2
-μ、(12n+1)·72κ·2
-μ;
其中,κ=T
s/T
c=64,T
s=1/(Δf
ref·N
f,ref),T
c=1/(Δf
max·N
f),Δf
max=480·10
3Hz,N
f=4096,Δf
ref=15·10
3Hz,N
f,ref=2048;μ∈{2,3,[4]…};
可选的,随机接入前导码序列的发送方法,还包括:
所述随机接入配置信息中,连续2
μ-3个物理随机接入信道PRACH时隙绑定为一个子块,μ≥3;所述随机接入配置信息还包括以下至少一种参数:
时域基本粒度内的PRACH时隙绑定的子块的数量;
一个子块中PRACH时机的数目;
可选的,
可选的,所述随机接入前导码序列格式包括M+L种格式;前M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;L为大于或者等于1的整数;
第M+L3种格式对应的时域长度N
μ=n
C·2048κ·2
-μ,循环前缀CP的长度
其中n
C为正整数;L3为不同的值时,对应的n
C不同,L1、L2、L3表示以第M种格式开始增加的序号值,L1+L2+L3小于或者等于L。
可选的,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源,包括:
在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;
基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
可选的,在所述时频资源上发送随机接入前导码序列,包括:
确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换;
需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
可选的,用于波束切换的第一时间间隔Gap位于每个RO的开头。
可选的,每个RO的时域结构相同;或者,
在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不小于波束切换的时间;或,
在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不 小于波束切换的时间;或,
每个RO的第一个符号整体用于波束切换。
可选的,用于波束切换的第二时间间隔Gap位于发生波束切换的符号上。
可选的,所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部分用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应波束上发送符号集合的循环前缀CP。
可选的,在一个RO内可以切换波束的次数,不超过n。
可选的,如果随机接入过程是由高层触发,则在高层中引入相应参数,用于指示一个RO内使用波束数,波束数由log
2n比特来指示;
如果随机接入过程是由PDCCH信令触发,则在PDCCH format 1-0中引入新的信息域或者利用预留比特来指示一个RO内使用的波束数,该信息域或者预留比特由log
2n比特来指示。
可选的,同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份;
如果RO在时域上能够均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;
如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号,将m份的第一个符号均用于波束切换。
可选的,同一RO内发送波束的切换顺序如下:
假设每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送同一RO。
可选的,如果随机接入过程是由高层信令触发,则终端进行下行同步块 的检测,判断同步块的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果成立,则使用该同步块所对应波束作为中心波束;
如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
可选的,确定了m个波束后,还包括:
按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换波束发送该RO的每一部分内容。
需要说明的是,该实施例中的通信设备是与上述图3所示的方法对应的终端,上述各实施例中的实现方式均适用于该实施例中,也能达到相同的技术效果。该终端中,收发机111与存储器113,以及收发机111与处理器112均可以通过总线接口通讯连接,处理器112的功能也可以由收发机111实现,收发机111的功能也可以由处理器112实现。在此需要说明的是,本公开实施例提供的上述终端,能够实现上述方法实施例所实现的所有方法步骤,且能够达到相同的技术效果,在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
如图12所示,本公开的实施例还提供一种随机接入前导码序列的发送装置120,应用于终端,所述装置包括:
收发模块121,用于接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;
处理模块122,用于根据根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;
所述收发模块121还用于在所述时频资源上发送随机接入前导码序列。
可选的,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀CP的长度为第二预设值的n倍,其中,n为正整数。
可选的,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;
第四格式、第五格式、第六格式、第七格式分别对应的时域长度N
μ分别为第三值的n倍,对应的循环前缀CP的长度
分别为(2n+1)·72κ·2
-μ、(4n+1)·72κ·2
-μ、(6n+1)·72κ·2
-μ、(12n+1)·72κ·2
-μ;
其中,κ=T
s/T
c=64,T
s=1/(Δf
ref·N
f,ref),T
c=1/(Δf
max·N
f),Δf
max=480·10
3Hz,N
f=4096,Δf
ref=15·10
3Hz,N
f,ref=2048;μ∈{2,3,[4]…};
可选的,随机接入前导码序列的发送方法,还包括:
所述随机接入配置信息中,连续2
μ-3个物理随机接入信道PRACH时隙绑定为一个子块,μ≥3;所述随机接入配置信息还包括以下至少一种参数:
时域基本粒度内的PRACH时隙绑定的子块的数量;
一个子块中PRACH时机的数目;
可选的,所述随机接入前导码序列格式包括M+L种格式;前M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;L为大于或者等于1的整数;
第M+L3种格式对应的时域长度N
μ=n
C·2048κ·2
-μ,循环前缀CP的长度
其中n
C为正整数;L3为不同的值时,对应的n
C不同,L1、L2、L3表示以第M种格式开始增加的序号值,L1+L2+L3小于或者等于L。
可选的,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源,包括:
在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;
基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
可选的,在所述时频资源上发送随机接入前导码序列,包括:
确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换;
需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
可选的,用于波束切换的第一时间间隔Gap位于每个RO的开头。
可选的,每个RO的时域结构相同;或者,
在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不 小于波束切换的时间;或,
在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不小于波束切换的时间;或,
每个RO的第一个符号整体用于波束切换。
可选的,用于波束切换的第二时间间隔Gap位于发生波束切换的符号上。
可选的,所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部分用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应波束上发送符号集合的循环前缀CP;或者,
所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应波束上发送符号集合的循环前缀CP。
可选的,在一个RO内可以切换波束的次数,不超过n。
可选的,如果随机接入过程是由高层触发,则在高层中引入相应参数,用于指示一个RO内使用波束数,波束数由log
2n比特来指示;
如果随机接入过程是由PDCCH信令触发,则在PDCCH format 1-0中引入新的信息域或者利用预留比特来指示一个RO内使用的波束数,该信息域或者预留比特由log
2n比特来指示。
可选的,同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份;
如果RO在时域上能够均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;
如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号,将m份的第一个符号均用于波束切换。
可选的,同一RO内发送波束的切换顺序如下:
假设每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送 同一RO。
可选的,如果随机接入过程是由高层信令触发,则终端进行下行同步块的检测,判断同步块的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果成立,则使用该同步块所对应波束作为中心波束;
如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
可选的,确定了m个波束后,还包括:
按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换波束发送该RO的每一部分内容。
需要说明的是,该实施例中的装置是与上述图3所示的方法对应的装置,上述各实施例中的实现方式均适用于该装置的实施例中,也能达到相同的技术效果。在此需要说明的是,本公开实施例提供的上述装置,能够实现上述方法实施例所实现的所有方法步骤,且能够达到相同的技术效果,在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
本公开的实施例还提供一种网络设备,包括:收发机,处理器,存储器,所述存储器上存有所述处理器可执行的程序;所述处理器执行所述程序时实现:发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
可选的,接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列,可以包括:
如果网络设备相应的接收波束可以覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备在收到来自多个不同波束上的前导码后,将所有前导码合并进行检测;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备只收到部分波束上的前导码;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,但是网络设备进行接收波束的切换,则网络设备先根据检测到前导码的RO资源与下行发送波束的关联关系,先确定中心接收波束,选择最靠近中心波束的m-1 个波束来进行波束的切换,接收同一RO;在其余m-1个波束上,按照每个波束对应同步块索引,从大到小或者从小到大的顺序进行切换波束接收该RO的余下部分内容。
本公开的实施例还提供一种随机接入前导码序列的接收装置,应用于网络设备,包括:
收发模块,用于发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
可选的,接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列,可以包括:
如果网络设备相应的接收波束可以覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备在收到来自多个不同波束上的前导码后,将所有前导码合并进行检测;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备只收到部分波束上的前导码;或者
如果网络设备相应的接收波束不能覆盖m个终端的发送波束,但是网络设备进行接收波束的切换,则网络设备先根据检测到前导码的RO资源与下行发送波束的关联关系,先确定中心接收波束,选择最靠近中心波束的m-1个波束来进行波束的切换,接收同一RO;在其余m-1个波束上,按照每个波束对应同步块索引,从大到小或者从小到大的顺序进行切换波束接收该RO的余下部分内容。
本公开的实施例还提供一种处理器可读存储介质,所述处理器可读存储介质存储有处理器可执行指令,所述处理器可执行指令用于使所述处理器执行如上所述的方法,上述方法实施例中的所有实现方式均适用于该实施例中,也能达到相同的技术效果。
本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方 法来实现所描述的功能,但是这种实现不应认为超出本公开的范围。
所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,上述描述的系统、装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。
在本公开所提供的实施例中,应该理解到,所揭露的装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,在本公开各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本公开的技术方案本质上或者说对相关技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本公开各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(read-only memory,ROM)、随机存取存储器(random access memory,RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
此外,需要指出的是,在本公开的装置和方法中,显然,各部件或各步骤是可以分解和/或重新组合的。这些分解和/或重新组合应视为本公开的等效 方案。并且,执行上述系列处理的步骤可以自然地按照说明的顺序按时间顺序执行,但是并不需要一定按照时间顺序执行,某些步骤可以并行或彼此独立地执行。对本领域的普通技术人员而言,能够理解本公开的方法和装置的全部或者任何步骤或者部件,可以在任何计算装置(包括处理器、存储介质等)或者计算装置的网络中,以硬件、固件、软件或者它们的组合加以实现,这是本领域普通技术人员在阅读了本公开的说明的情况下运用他们的基本编程技能就能实现的。
因此,本公开的目的还可以通过在任何计算装置上运行一个程序或者一组程序来实现。所述计算装置可以是公知的通用装置。因此,本公开的目的也可以仅仅通过提供包含实现所述方法或者装置的程序代码的程序产品来实现。也就是说,这样的程序产品也构成本公开,并且存储有这样的程序产品的存储介质也构成本公开。显然,所述存储介质可以是任何公知的存储介质或者将来所开发出来的任何存储介质。还需要指出的是,在本公开的装置和方法中,显然,各部件或各步骤是可以分解和/或重新组合的。这些分解和/或重新组合应视为本公开的等效方案。并且,执行上述系列处理的步骤可以自然地按照说明的顺序按时间顺序执行,但是并不需要一定按照时间顺序执行。某些步骤可以并行或彼此独立地执行。
可以理解的是,本公开实施例描述的这些实施例可以用硬件、软件、固件、中间件、微码或其组合来实现。对于硬件实现,模块、单元、子单元可以实现在一个或多个专用集成电路(Application Specific Integrated Circuits,ASIC)、数字信号处理器(Digital Signal Processor,DSP)、数字信号处理设备(DSP Device,DSPD)、可编程逻辑设备(Programmable Logic Device,PLD)、现场可编程门阵列(Field-Programmable Gate Array,FPGA)、通用处理器、控制器、微控制器、微处理器、用于执行本公开所述功能的其它电子单元或其组合中。
对于软件实现,可通过执行本公开实施例所述功能的模块(例如过程、函数等)来实现本公开实施例所述的技术。软件代码可存储在存储器中并通过处理器执行。存储器可以在处理器中或在处理器外部实现。
以上所述的是本公开的可选实施方式,应当指出对于本技术领域的普通 人员来说,在不脱离本公开所述的原理前提下还可以作出若干改进和润饰,这些改进和润饰也在本公开的保护范围内。
Claims (61)
- 一种随机接入前导码序列的发送方法,应用于终端,包括:接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;在所述时频资源上发送随机接入前导码序列。
- 根据权利要求1所述的随机接入前导码序列的发送方法,其中,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀CP的长度为第二预设值的n倍,其中,n为正整数。
- 根据权利要求2所述的随机接入前导码序列的发送方法,其中,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;第四格式、第五格式、第六格式、第七格式分别对应的时域长度N μ分别为第三值的n倍,对应的循环前缀CP的长度 分别为(2n+1)·72κ·2 -μ、(4n+1)·72κ·2 -μ、(6n+1)·72κ·2 -μ、(12n+1)·72κ·2 -μ;其中,κ=T s/T c=64,T s=1/(Δf ref·N f,ref),T c=1/(Δf max·N f),Δf max=480·10 3Hz,N f=4096,Δf ref=15·10 3Hz,N f,ref=2048;μ∈{2,3,[4]…};
- 根据权利要求1或2或8所述的随机接入前导码序列的发送方法,其中,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源,包括:在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
- 根据权利要求9所述的随机接入前导码序列的发送方法,其中,在所述时频资源上发送随机接入前导码序列,包括:确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换;需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
- 根据权利要求10所述的随机接入前导码序列的发送方法,其中,用于波束切换的第一时间间隔Gap位于每个RO的开头。
- 根据权利要求11所述的随机接入前导码序列的发送方法,其中,每个RO的时域结构相同;或者,在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不小于波束切换的时间;或者,在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不小于波束切换的时间;或者,每个RO的第一个符号整体用于波束切换。
- 根据权利要求11所述的随机接入前导码序列的发送方法,其中,用于波束切换的第二时间间隔Gap位于发生波束切换的符号上。
- 根据权利要求13所述的随机接入前导码序列的发送方法,其中,所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部分用于在相应波束上发送符号集合的循环前缀CP;或者,所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应波束上发送符号集合的循环前缀CP;或者,所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应波束上发送符号集合的循环前缀CP。
- 根据权利要求11所述的随机接入前导码序列的发送方法,其中,在一个RO内可以切换波束的次数,不超过n。
- 根据权利要求15所述的随机接入前导码序列的发送方法,其中,如果随机接入过程是由高层触发,则在高层中引入相应参数,用于指示一个RO内使用波束数,波束数由log 2n比特来指示;如果随机接入过程是由PDCCH信令触发,则在PDCCH format 1-0中引入新的信息域或者利用预留比特来指示一个RO内使用的波束数,该信息域或者预留比特由log 2n比特来指示。
- 根据权利要求11所述的随机接入前导码序列的发送方法,其中,同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份;如果RO在时域上能够均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号,将m份的第一个符号均用于波束切换。
- 根据权利要求11所述的随机接入前导码序列的发送方法,其中,同一RO内发送波束的切换顺序包括:如果每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送 同一RO。
- 根据权利要求18所述的随机接入前导码序列的发送方法,其中,如果随机接入过程是由高层信令触发,则终端进行下行同步块的检测,判断同步块的实际参考信号接收功率RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果大于,则使用该同步块所对应波束作为中心波束;如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
- 根据权利要求19所述的随机接入前导码序列的发送方法,其中,配置了m个波束后,还包括:按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换,在波束发送该RO的每一部分内容。
- 一种随机接入前导码序列的接收方法,应用于网络设备,包括:发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
- 根据权利要求21所述的随机接入前导码序列的接收方法,其中,接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列,包括:如果网络设备相应的接收波束可以覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备在收到来自多个不同波束上的前导码后,将所有前导码合并进行检测;或者如果网络设备相应的接收波束不能覆盖m个终端的发送波束,且不进行接收波束的切换,则网络设备只收到部分波束上的前导码;或者如果网络设备相应的接收波束不能覆盖m个终端的发送波束,但是网络设备进行接收波束的切换,则网络设备先根据检测到前导码的RO资源与下行发送波束的关联关系,先确定中心接收波束,选择最靠近中心波束的m-1个波束来进行波束的切换,接收同一RO;在其余m-1个波束上,按照每个波束对应同步块索引,从大到小或者从小到大的顺序进行切换波束接收该RO 的余下部分内容。
- 一种终端,包括:收发机,处理器,存储器,所述存储器上存有所述处理器可执行的程序;所述处理器执行所述程序时实现:接收随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;在所述时频资源上发送随机接入前导码序列。
- 根据权利要求23所述的终端,其中,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀CP的长度为第二预设值的n倍,其中,n为正整数。
- 根据权利要求24所述的终端,其中,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;第四格式、第五格式、第六格式、第七格式分别对应的时域长度N μ分别为第三值的n倍,对应的循环前缀CP的长度 分别为(2n+1)·72κ·2 -μ、(4n+1)·72κ·2 -μ、(6n+1)·72κ·2 -μ、(12n+1)·72κ·2 -μ;其中,κ=T s/T c=64,T s=1/(Δf ref·N f,ref),T c=1/(Δf max·N f),Δf max=480·10 3Hz,N f=4096,Δf ref=15·10 3Hz,N f,ref=2048;μ∈{2,3,[4]…};
- 根据权利要求23或24或29所述的终端,其中,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源,包括:在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
- 根据权利要求31所述的终端,其中,在所述时频资源上发送随机接入前导码序列,包括:确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换;需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
- 根据权利要求32所述的终端,其中,用于波束切换的第一时间间隔Gap位于每个RO的开头。
- 根据权利要求33所述的终端,其中,每个RO的时域结构相同;或者,在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不小于波束切换的时间;或者,在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不小于波束切换的时间;或者,每个RO的第一个符号整体用于波束切换。
- 根据权利要求32所述的终端,其中,用于波束切换的第二时间间隔Gap位于发生波束切换的符号上。
- 根据权利要求35所述的终端,其中,所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部 分用于在相应波束上发送符号集合的循环前缀CP;或者,所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应波束上发送符号集合的循环前缀CP;或者,所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应波束上发送符号集合的循环前缀CP。
- 根据权利要求32所述的终端,其中,同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号。
- 根据权利要求32所述的终端,其中,同一RO内发送波束的切换顺序如下:如果每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送同一RO。
- 根据权利要求38所述的终端,其中,如果随机接入过程是由高层信令触发,则终端进行下行同步块的检测,判断同步块的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果大于,则使用该同步块所对应波束作为中心波束;如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
- 根据权利要求39所述的终端,其中,配置了m个波束后,所述处理器还用于按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换,在波束发送该RO的每一部分内容。
- 一种随机接入前导码序列的发送装置,应用于终端,包括:收发模块,用于接收随机接入配置信息,所述随机接入配置信息中的前 导码序列格式所占的时域符号数大于预设值;处理模块,用于根据根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源;所述收发模块还用于在所述时频资源上发送随机接入前导码序列。
- 根据权利要求41所述的随机接入前导码序列的发送装置,其中,所述随机接入前导码序列格式包括M种格式;所述M种格式中的至少一种格式对应的时域长度为第一预设值的n倍,循环前缀CP的长度为第二预设值的n倍,其中,n为正整数。
- 根据权利要求42所述的随机接入前导码序列的发送装置,其中,所述M种格式包括:第一格式、第二格式、第三格式、第四格式、第五格式、第六格式、第七格式、第八格式以及第九格式;第四格式、第五格式、第六格式、第七格式分别对应的时域长度N μ分别为第三值的n倍,对应的循环前缀CP的长度 分别为(2n+1)·72κ·2 -μ、(4n+1)·72κ·2 -μ、(6n+1)·72κ·2 -μ、(12n+1)·72κ·2 -μ;其中,κ=T s/T c=64,T s=1/(Δf ref·N f,ref),T c=1/(Δf max·N f),Δf max=480·10 3Hz,N f=4096,Δf ref=15·10 3Hz,N f,ref=2048;μ∈{2,3,[4]…};
- 根据权利要求41或42或47所述的随机接入前导码序列的发送装置,其中,根据所述前导码序列格式,确定发送随机接入前导码序列的时频资源,包括:在一个由多个PRACH时隙绑定在一起的子块中,确定PRACH时机的有效性;基于有效的PRACH时机,根据所述前导码序列格式,确定在一个发送波束上用于传输随机接入前导码序列的时频资源RO。
- 根据权利要求49所述的随机接入前导码序列的发送装置,其中,在所述时频资源上发送随机接入前导码序列,包括:确定可使用的RO后,根据配置或者预配置的发送波束个数,确定是否在发送RO时进行波束切换;需要进行RO内波束切换时,切换不同波束,发送随机接入前导码序列。
- 根据权利要求50所述的随机接入前导码序列的发送装置,其中,用于波束切换的第一时间间隔Gap位于每个RO的开头。
- 根据权利要求51所述的随机接入前导码序列的发送装置,其中,每个RO的时域结构相同;或者,在每个RO的原CP长度基础上增加额外的extra_CP,extra_CP的长度不小于波束切换的时间;或,在RO的原CP基础上增加额外的一段随机信号,随机信号时域的长度不小于波束切换的时间;或,每个RO的第一个符号整体用于波束切换。
- 根据权利要求50所述的随机接入前导码序列的发送装置,其中,用于波束切换的第二时间间隔Gap位于发生波束切换的符号上。
- 根据权利要求53所述的随机接入前导码序列的发送装置,其中,所述第二时间间隔Gap位于发生波束切换的符号的首部,该符号剩余部 分用于在相应波束上发送符号集合的循环前缀CP;或者,所述第二时间间隔Gap位于发生波束切换的符号的尾部,紧邻的后一个符号用于在相应波束上发送符号集合的循环前缀CP;或者,所述第二时间间隔Gap位于发生波束切换的符号的中间位置,所述第二时间间隔Gap之前部分用作性能的增强,所述第二时间间隔Gap之后的部分用作在相应波束上发送符号集合的循环前缀CP。
- 根据权利要求50所述的随机接入前导码序列的发送装置,其中,同一RO内用于波束切换的符号位置,根据配置或预配置的可用波束个数m,将RO在时域上均等分为m份,所述m份波束中除第一份之外的剩余m-1份的第一个符号均用于波束切换;如果RO在时域上无法等分为m份,作为余数的m’个符号数被包含在第m份内,或者令前m’份均多分配一个符号。
- 根据权利要求50所述的随机接入前导码序列的发送装置,其中,同一RO内发送波束的切换顺序如下:假设每个RO配置了m个波束,其中m<=n;使用检测到同步块时所对应的接收波束作为中心发送波束,根据系统配置或预配置的波束个数m,在中心波束两侧,选择最靠近中心波束的m-1个波束来进行波束的切换,发送同一RO。
- 根据权利要求56所述的随机接入前导码序列的发送装置,其中,如果随机接入过程是由高层信令触发,则终端进行下行同步块的检测,判断同步块的实际RSRP测量值是否大于从系统广播消息获取的RSRP阈值,如果大于,则使用该同步块所对应波束作为中心波束;如果随机接入过程是由PDCCH信令触发,那么终端使用PDCCH信令指定同步块对应的波束作为中心波束。
- 根据权利要求57所述的随机接入前导码序列的发送装置,其中,确定了m个波束后,所述处理模块还用于:按照每个波束对应同步块索引的从大到小或者从小到大的顺序进行切换,在波束发送该RO的每一部分内容。
- 一种网络设备,包括:收发机,处理器,存储器,所述存储器上存 有所述处理器可执行的程序;所述处理器执行所述程序时实现:发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
- 一种随机接入前导码序列的接收装置,应用于网络设备,包括:收发模块,用于发送随机接入配置信息,所述随机接入配置信息中的前导码序列格式所占的时域符号数大于预设值;接收终端在发送随机接入前导码序列的时频资源上发送的随机接入前导码序列。
- 一种处理器可读存储介质,其中,所述处理器可读存储介质存储有处理器可执行指令,所述处理器可执行指令用于使所述处理器执行权利要求1至20中任一项所述的方法或者执行权利要求21至22中任一项所述的方法。
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| CN119054404A (zh) * | 2022-04-29 | 2024-11-29 | Oppo广东移动通信有限公司 | 一种上行传输方法及装置、终端设备、网络设备 |
| CN117580144A (zh) * | 2022-08-03 | 2024-02-20 | 大唐移动通信设备有限公司 | 前导序列的发送和接收方法、装置及存储介质 |
| CN117835447A (zh) * | 2022-09-26 | 2024-04-05 | 荣耀终端有限公司 | 前导码重复发送方法、装置、系统及介质 |
| CN115988675B (zh) * | 2022-12-15 | 2026-04-14 | 紫金山实验室 | 基于波束分合的mMTC切片随机接入控制方法和系统 |
| CN119946892A (zh) * | 2023-11-03 | 2025-05-06 | 华为技术有限公司 | 随机接入方法及相关装置 |
| CN121397684A (zh) * | 2024-07-12 | 2026-01-23 | 荣耀终端股份有限公司 | 一种通信处理方法、装置、芯片及存储介质 |
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