WO2019192409A1 - 一种降低时延的方法及装置 - Google Patents
一种降低时延的方法及装置 Download PDFInfo
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- WO2019192409A1 WO2019192409A1 PCT/CN2019/080679 CN2019080679W WO2019192409A1 WO 2019192409 A1 WO2019192409 A1 WO 2019192409A1 CN 2019080679 W CN2019080679 W CN 2019080679W WO 2019192409 A1 WO2019192409 A1 WO 2019192409A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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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
- H04L5/0078—Timing of allocation
- H04L5/0082—Timing of allocation at predetermined intervals
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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
- 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
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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
Definitions
- the present application relates to the field of communications technologies, and in particular, to a method and apparatus for reducing latency.
- the terminal sends a random access preamble (message 1, msg1) to the base station; the base station sends a message 2 (msg2) to the terminal in response to the random access preamble; after the terminal receives, waits for a time interval, Sending message 3 (msg3) to the base station, how to reduce the time interval between message 2 and message 3, and improving the efficiency of random access is a problem that needs to be solved at present.
- a random access preamble messagessage 1, msg1
- msg2 message 2
- Sending message 3 msg3
- the present application provides a method and apparatus for reducing latency to reduce delay in a random access procedure.
- a method for reducing latency is disclosed, which is applied to a random access procedure, including:
- the terminal device sends a message 1 to the network device, where the message 1 is a random access preamble; the terminal device receives the message 2 sent by the network device; after a time interval, the terminal device sends a message 3 to the network device, where the time interval includes the TA ;
- the network device receives the message 1 sent by the terminal device, and sends a message 2 to the terminal device. After a time interval, the message is received by the terminal device, and the time interval includes the TA;
- the TA is related to the message 1 (random access preamble) format of the terminal device;
- the TA is related to a message 1 (random access preamble) format of the terminal device and a cell radius supported by the message 1;
- the cell radius may also be replaced by one or more of the following beam-related parameters, such as coverage, coverage direction, beam identification, filter coefficients sent or received by the base station, etc., and the cell radius may be calculated from these parameters;
- the TA is related to a message 1 (random access preamble) format of the terminal device and a subcarrier spacing supported by the message 1;
- the TA is related to the message 1 (random access preamble) format of the terminal device, the cell radius supported by the message 1, and the subcarrier spacing supported by the message 1;
- the cell radius supported by the above message 1 may be the maximum cell radius, and the message 1 support subcarrier interval may be the minimum subcarrier interval.
- the TA is related to a message 1 (random access preamble) format of the terminal device, and a minimum subcarrier interval and/or a maximum cell radius of the message 1 in a frequency range of the terminal device; for example, a high frequency (greater than or equal to 6 GHz), the corresponding message 1 subcarrier spacing includes 60 kHz, 120 kHz; low frequency (less than 6 GHz), and the corresponding message 1 subcarrier spacing includes 15 kHz, 30 kHz.
- a high frequency greater than or equal to 6 GHz
- the corresponding message 1 subcarrier spacing includes 60 kHz, 120 kHz
- low frequency less than 6 GHz
- the corresponding message 1 subcarrier spacing includes 15 kHz, 30 kHz.
- the foregoing correlation may refer to association.
- the determination may be replaced by determining or calculating.
- the TA may be determined by the network device to notify the terminal device, and then the terminal device determines the time interval according to the TA.
- the TA may also be determined by the terminal device according to the terminal device. Some parameters indicated by the network device (eg, TAC, distance between the network device and the terminal device, etc.) are determined; or are predetermined by the network device and the terminal device, respectively.
- the network device may notify the terminal device of the message 1 (random access preamble) format, and the subcarrier spacing supported by the message 1, the message 3, the TA/TAC/distance value, and the like, and may pass the PBCH (physical broadcast channel).
- message 1 random access preamble
- PBCH physical broadcast channel
- SI system information
- RMSI main system information
- SIB1 system information block 1, system information block 1
- SIB2 system information block 2, system information block 2
- PDCCH physical downlink control channel
- RRC radio resource control
- MAC-CE Media Access Control-control element
- MAC Header Media Access Control Header
- MAC PDU Media Access Control Protocol Data Unit
- PDSCH Physical Downlink Shared Channel
- RAR Random Access Response
- DCI downlink control information, downlink control One or more of the information
- the terminal device determines the TA of the terminal device according to the indication of the network device, and further determines the time interval between the message 2 and the message 3, and sends a message 3 to the network device according to the time interval; correspondingly, the network The device can also determine the TA of the terminal device and receive message 3 at the corresponding location.
- the TA may be determined by a TAC value indicated by the network device, where the TAC is less than or equal to 3846, and is greater than or equal to a maximum TAC among the terminal devices served by the network device;
- the value of the indicated TAC may also be related to a random access preamble format of the terminal device.
- the TA value thus determined will also be less than the TA determined according to 3846, which is the maximum TAC value defined by the protocol.
- the TA may also be determined by a distance value indicated by the network device, where the distance is less than or equal to 300 KM, and is greater than or equal to a maximum distance in the terminal device served by the network device;
- the indicated distance value may also be related to a random access preamble format of the terminal device.
- the terminal device may also adopt a TA indicated by the network device, that is, the TA is determined by the network device, and is instructed to the terminal device, where the TA is a TA indicated by the network device, where the TA is less than or equal to 2 ms. And greater than or equal to the maximum TA in the terminal device of the network device service;
- the value of the TA may also be related to a random access preamble (ie, message 1) format of the terminal device.
- the terminal device served by the network device may be one or more terminal devices covered by the serving cell of the network device, or may be one or more terminal devices covered by one or more beams of the network device.
- the foregoing further includes:
- the network device sends the indication information to the terminal device, to notify the terminal device whether the network device receives the random access preamble by using a beam scanning manner, and may be in the PBCH/SI/SIB1/SIB2/RMSI/MSG2DCI/MAC Header/MAC
- a 1-bit indication is used in one or more of the PDU/PDSCH/RAR. For example, the bit is 0, indicating that beam scanning is used for reception; the bit is 1, indicating that beam scanning reception is not used. This indication can also be an independent scheme.
- the network device may indicate the TAC, TA, or distance value of the terminal device by one or more of PBCH/SI/SIB1/SIB2/RMSI/MSG2DCI/MAC Header/MAC PDU/PDSCH/RAR.
- the network device may further indicate, by using the foregoing message, a TA scaling factor for the terminal device, where the TA scaling factor is an integer less than 1, and the terminal device needs to multiply the scaling factor when calculating the final TA.
- the network device may further notify the terminal device whether the network device receives the random access preamble by using a beam scanning manner.
- the network device determines a largest TA of the TAs of the plurality of terminal devices in the coverage area of the serving cell or the service beam, and notifies the maximum TA of all the terminal devices in the coverage area of the serving cell or the service beam, and each terminal device After receiving, the time interval between the message 2 and the message 3 in the random access procedure is determined according to the maximum TA, and the message 3 is sent to the network device according to the determined time interval.
- the network device After receiving the message 1 sent by the terminal device, the network device determines the maximum TA, and notifies each terminal device in the coverage by using the message 2, so that the received terminal device determines the message between the message 2 and the message 3 according to the TA. Time interval, and send a message 3 to the network device according to the time interval.
- the TA of each terminal device can be determined, and the maximum TA is selected in the same manner, the time interval between Msg2 and Msg3 is calculated according to the maximum TA, and the message sent by the terminal device is received at the corresponding location. 3.
- the TA may also be a TAC or a terminal distance, and may also notify a value greater than or equal to a maximum TA, TAC, or terminal distance. Further, the value of the notified TA, TAC, or terminal distance may be greater than the above. The maximum value and the set value closest to the above maximum value. If the network device notifies the TAC or the distance setting value, the terminal device first calculates the TA according to the TAC or the distance setting value, and further determines the time interval.
- each terminal device uses the maximum TA (or maximum TAC, maximum distance) to calculate the time interval between message 2 and message 3.
- each terminal device can also determine the time interval using the respective TA.
- the network device determines the TA of each terminal device in the coverage of the serving cell or the service beam, and notifies the TA of each terminal device to each terminal device in the coverage area of the serving cell or the service beam. After receiving the terminal device, each terminal device determines, according to the respective TA. The time interval between message 2 and message 3 in the random access procedure, and sends a message 3 to the network device according to the determined time interval.
- the above TA may also be a TAC or a terminal distance.
- the set value can also be used, similar to the above case, and will not be described in detail.
- the TA of each terminal device can be determined according to the received message 1, and then the time interval between each terminal device Msg2 and Msg3 is calculated, and the message 3 sent by each terminal device is received at the corresponding location.
- the network device may further indicate the terminal device TA scaling factor. After the terminal device determines the TA, the terminal device needs to be multiplied by the scaling factor to obtain the last TA.
- the program can also be an independent program.
- the scaling factor can also be pre-agreed by the network device and the terminal device.
- the scaling factor may be indicated in one or more of the PBCH/SI/SIB1/SIB2/RMSI/Msg2 DCI/MAC PDUs.
- the network device indicates which parameters the terminal device uses to determine the TA, and further determines the time interval; then the network device itself also uses these parameters to determine the TA, and further determines the time interval; the terminal device sends the message at the determined time interval. 3. The network device also receives the message 3 at the time interval.
- a corresponding device which is a terminal device or a network device, or may be a chip or a function module of the terminal device or the network device, respectively performing the steps in the corresponding method, and may include the following one or Multiple modules:
- Transmitting module a step for performing a sending class in the above method
- Receiving module a step for performing a receiving class in the above method
- Processing module used to perform other steps in the above method except for sending and receiving, such as calculation, determination, and the like.
- the network device and the terminal device of the foregoing various solutions have the functions of implementing the corresponding steps performed by the network device and the terminal device in the foregoing method; the functions may be implemented by using hardware or by executing corresponding software through hardware.
- the hardware or software includes one or more modules corresponding to the above functions; for example, the transmitting module may be replaced by a transmitter, the receiving module may be replaced by a receiver, and other modules, such as a processing module, etc., may be replaced by a processor and executed separately Transmission operations, reception operations, and related processing operations in various method embodiments.
- each module included in each of the above devices has a function corresponding to each of the above methods.
- This function can be implemented in hardware or in hardware by executing the corresponding software.
- the hardware or software includes one or more modules corresponding to the functions described above.
- a module can also be called a unit.
- the determination or calculation of each parameter (such as TA) mentioned in the above method is implemented by the processing module, and the sending or receiving of the indication information is implemented by the sending module or the receiving module.
- each of the foregoing devices may include: a processing unit (module) and a transceiver unit (module), and the transceiver unit may include a transmitting unit (module) and a receiving unit (module), respectively performing the sending in each method described above.
- the transceiver unit may be, for example, a transceiver for performing the transmitting and receiving steps in the above method; the transceiver includes a radio frequency circuit, The transmitter and the receiver may be respectively included for performing the steps of the transmitting class and the receiving class in the method; the processing unit may be a processor for performing steps other than transmitting and receiving in the above methods, and processing
- the unit or processor can be one or more.
- the device further comprises a storage unit (module), which may be a memory.
- a storage unit for storing a computer execution instruction
- the processing unit is coupled to the storage unit, the processing unit executing computer execution instructions stored by the storage unit to cause the apparatus to perform the method of any of the above.
- the chip when the device is a chip, the chip may include: a processing unit and a transceiver unit, the processing unit may be, for example, a processor, and the processor may be at least one; the transceiver unit may be, for example, Is the input / output interface, pins or circuits on the chip.
- the processing unit may execute a computer-executable instruction stored by the storage unit to cause the chip within the terminal to perform the method of signal detection of any of the above aspects.
- the storage unit is a storage unit in the chip, such as a register, a cache, etc.
- the storage unit may also be a storage unit located outside the chip in the terminal device, such as a read-only memory ( Read-only memory (ROM) or other types of static storage devices, random access memory (RAM), etc. that can store static information and instructions.
- ROM Read-only memory
- RAM random access memory
- the processor mentioned in any of the above may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the above.
- CPU central processing unit
- ASIC application-specific integrated circuit
- Yet another aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.
- Yet another aspect of the present application provides a communication chip in which instructions are stored that, when run on a network device or terminal device, cause the computer to perform the methods described in the various aspects above.
- Yet another aspect of the present application provides a computer readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform the methods described in the above aspects.
- FIG. 1 is a schematic diagram of a random access process
- FIG. 2 is a schematic diagram of a network device/terminal device provided by an embodiment of the present application.
- FIG. 3 is a schematic diagram of a network device/terminal device according to another embodiment of the present application.
- a terminal device in the embodiment of the present application may refer to an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user.
- the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
- the network device in the implementation of the present application is a network side device that performs wireless communication with the terminal device, for example, a Wireless-Fidelity (Wi-Fi) access point, a base station of a next-generation communication, such as a gNB of 5G. Or a small station, a micro station, a transmission reception point (TRP), or a relay station, an access point, an in-vehicle device, a wearable device, or the like.
- Wi-Fi Wireless-Fidelity
- the present application introduces a random access procedure by using a network device as a base station and a terminal device as a terminal:
- Step 1 The base station periodically broadcasts a synchronization signal block (SSB) and remaining system information (RMSI).
- the RMSI includes RACH (Random Access Channel) configuration information of the base station, and RACH configuration.
- the information includes the random access preamble (message 1, msg1) format used by the terminal in the access process, the subcarrier spacing of the message 1, the subcarrier spacing of the message 3, the subcarrier spacing of the message 2, and the subcarrier spacing of the message 4.
- At least one of the terminals is configured to listen to the random access response (RAR, window) length of the message 2, and also includes the synchronization signal block SSB and its corresponding random access opportunity RO (RACH occasion) Related information, a configuration period of a PRACH (physical random access channel), and the like.
- Step 2 If there are multiple SSBs and/or CSI-RSs, the terminal selects an SSB and/or CSI-RS that receives an RSRP (reference signal received power) above a predefined threshold, and On the RO corresponding to the SSB and/or the CSI-RS, the message 1 (ie, the preamble ID) for random access is determined/selected, and then the message 1, that is, the random access preamble, is transmitted by using the corresponding subcarrier spacing.
- RSRP reference signal received power
- Step 3 After detecting the random access preamble sent by the terminal on the corresponding location RO, the base station can calculate the timing advance (TA) or the equivalent distance value of the terminal to the base station by detecting the random access preamble. At the same time, the ID of the random access preamble detected on the RO can be known.
- TA timing advance
- the ID of the random access preamble detected on the RO can be known.
- Step 4 In the RAR window, the base station responds to the received random access preamble, and sends a message 2 to the terminal, including downlink control information (downlink control information, which is carried by the PDCCH (physical downlink control channel). DCI) and information carried by the PDSCH (Physical downlink shared channel) indicated by the DCI.
- the PDSCH includes MAC (Media Access Control) header information and a random access response. If multiple terminals on a RO send a random access preamble, the base station will perform a random access response to all terminals in one message 2, that is, the message 2 includes RARs of multiple terminals.
- the information in the PDSCH includes one or more MAC headers and possibly multiple RARs.
- the plurality of RARs include a Time Advance Command (TAC) for each terminal, which may be 12 bits, which indicates the amount of time advancement the terminal should take in transmitting the message 3.
- TAC Time Advance Command
- a UL grant for scheduling message 3 is also included in each RAR, and the time domain and frequency domain resource information sent by the message 3 are included in the UL grant.
- Step 5 After the terminal receives the message 2, after waiting for a time interval, the message 3 is sent according to the information indicated in the UL grant, and the terminal identification information may be carried in the subsequent message 4 for conflict resolution.
- Step 6 After receiving the message 3, the base station selects the terminal that successfully competes and replies to the message 4.
- the time interval between message 2 and message 3 usually includes N1+N2+L2+TA.
- the TA agreed by the 3GPP RAN1 working group is based on 12 bits, and the maximum 3846 is calculated, which introduces a large delay.
- the above message 1-6 refers to the random access procedure message 1-6 (msg1-msg6), and the solution may involve some or all of the steps, for example, involved in steps 1-3, where the message 1 is a random access preamble. Also known as random access preamble, message 2 is random access corresponding.
- Message 1 consists of a cyclic prefix (CP) and a sequence.
- CP cyclic prefix
- the cyclic prefix is obtained by cyclically shifting the sequence.
- the sequence can be repeated one or more times.
- the base station can receive the message 1 in two ways: 1. Using beam scanning, using different receiving beams for repeated sequences; 2.
- the base station uses only one receiving beam.
- a sequence of cyclic prefix CP and multiple repetitions is received.
- multiple repetitions of the sequence are equivalent to increasing the length of the cyclic prefix.
- 5G NR (new radio) determines at RAN1-91 meeting that the minimum time interval between msg2 and msg3 is: Duration of N1+duration of N2+L2+TA.
- N1 is the time required for the terminal to process and prepare the PDSCH, and is related to the terminal capability and subcarrier spacing (SCS):
- N1 is based on min ( ⁇ DL , ⁇ UL ), ⁇ DL is the SCS of the PDSCH, and ⁇ UL is the subcarrier spacing SCS of the HARQ-ACK uplink.
- N2 is the time required for the terminal to process and prepare the physical uplink shared channel (PUSCH).
- the time for preparing the message 3 in this application is related to the terminal capability and the subcarrier spacing, as shown in the following table, where the subcarrier is 15*2 ⁇ u, u is the subcarrier configuration:
- N2 is based on min ( ⁇ DL , ⁇ UL ), ⁇ DL is the subcarrier spacing SCS of the DCI carrying PDCCH, and ⁇ UL is the SCS of the PUSCH.
- TA is the maximum delay that can be supported by the 12-bit TAC (Time advance command, in RAR). Corresponding to different message 3 uplink subcarrier spacing, the maximum TA is as follows:
- the present application is to reduce the TA between Msg2 and Msg3 in the RACH process, so that the Gap between Msg2 and Msg3 is reduced, and the RACH efficiency is improved.
- the long sequence usually refers to a sequence with a random access preamble sequence length of 839, and the following three methods can be used:
- the base station can be in the PBCH (physical broadcast channel) / SI (system information) / SIB1 (system information block 1) / SIB2 (System information block 2) / RMSI / MSG2 DCI /
- the MSG2 MAC Header/MSG2 RAR indicates the terminal, and the base station uses beam scanning for whether the random access preamble reception process is received. For example, if the 1 bit indication is used, the indication bit is 0, indicating that the beam scanning is used for receiving; if the bit is 1, the representative base station does not use beam scanning to receive. Alternatively, the base station does not explicitly indicate the receiving mode, and the base station-terminal defaults/predefines a receiving mode of the random access preamble.
- the terminal determines one or more of the corresponding TA value, the number of OFDM symbols, and the TAC value according to the indication of the receiving manner of the message 1 by the base station and the corresponding message 1 (random access preamble) format, and calculates the message 2 and the message by using the message.
- the maximum TA is determined by the maximum cell radius (or maximum coverage/distance) supported by message 1 (ie, random access preamble), according to the formula
- Radius represents the cell radius or coverage/distance supported by the random access preamble
- c represents the speed of light
- the supported cell radius is approximately:
- Ts 1/3072000
- Cyclic prefix length ⁇ f RA subcarrier interval size
- N u is the sequence length.
- one base station serving cell or all terminals covered by one beam use the same random access preamble format.
- the cell radius and the maximum TA corresponding to each long sequence format random access preamble are calculated as shown in the following table:
- maximum TA and L2 500us, converted to the number of symbols, as shown in the following table:
- the maximum TA is superimposed with L2, N1, and N2, and converted into the number of symbols, as shown in the following two tables, wherein the message 1 subcarrier spacing is 15*. 2 ⁇ u KHz:
- the cell radius corresponding to the random access preamble of each format is far less than 300KM. Therefore, the TA calculated according to the radius of each cell is far less than the calculated according to the cell radius of 300KM. TA.
- the repeated sequence can serve as an additional random access preamble.
- the increased random access preamble length can increase the cell coverage radius/distance.
- the equivalent random access preamble length and the corresponding cell coverage radius/distance are as follows:
- the result can be rounded up/down, and the conversion manner is similar to the above-mentioned concentration case, and will not be described in detail.
- the cell radius corresponding to the random access preamble of each format is far less than 300KM. Therefore, the TA calculated according to the above-mentioned respective cell radius is much smaller than the TA calculated according to the 300KM cell radius. .
- the TA is associated with a random access preamble format, and the base station or the terminal may determine the TA according to the random access preamble of the terminal and the cell radius supported by the random access preamble, and According to the TA determining the time interval between the message 2 and the message 3, after receiving the message 2 sent by the base station, the terminal may send a message 3 to the base station according to the time interval, and the base station receives the message sent by the terminal at the corresponding location according to the time interval. . If the base station uses the beam scanning to receive the random access preamble of the terminal, the maximum supported cell radius of the random access preamble is determined by the cyclic prefix corresponding to the random access preamble.
- the maximum supported cell radius of the random access preamble is determined by the cyclic prefix corresponding to the random access preamble And N u is determined.
- the maximum value indicated by the TAC is 3846, which is applicable to a scenario where the cell coverage radius is 300KM.
- the actual cell radius is much smaller than 300KM. Therefore, the TA value can be reduced according to the TAC value less than 3846.
- TA and TAC can be converted according to the prior art, and will not be described here.
- the base station indicates the TAC employed by the terminal. There may be more than one candidate TAC value.
- the TAC candidate value is 2 is 3846 and 1282 respectively, and the base station indicates by 1 bit that the terminal should be used to calculate the value of the maximum TA; or, the candidate value includes 4, for example, 3846, 1923, 961, 480, and the base station passes 2 bits. Indicates that the terminal should be used to calculate the value of the maximum TA.
- the number of candidate values X and the specific value are not limited, and the value is less than or equal to 3846.
- the base station uses ceil (log2(X)) for indication, and ceil indicates rounding up.
- the base station can learn the distance of each terminal or the TAC value or the value of the TA through the message 1 of each terminal. Take TAC as an example, take the TAC maximum value in each terminal, and determine the TAC value that is less than or equal to 3846 and greater than or equal to the maximum value.
- the base station may convert to a TA value and indicate the TA adopted by the terminal.
- a plurality of candidate TA values for example, 2, 4, 6, 8, etc., similar to the above.
- the specific manner indicated by the base station includes indication by ceil (log2(X)) bit in PBCH/SI/SIB1/SIB2/RMSI/MSG2 DCI/MAC Header/MAC PDU/PDSCH/RAR.
- the TA or TAC value selected by the base station should be greater than or equal to the maximum TA or TAC of all terminals, for example, the selected candidate TA or TAC value satisfies a minimum value greater than "maximum TA or TAC".
- the base station can learn the TA or TAC of multiple terminals through the message 1, take the maximum value, and then specify the value of the actual TA or TAC for the terminal, which needs to be greater than or equal to the maximum value.
- the base station uses a 1-bit indication, and the indication bits msg1-scs of the message 1 sub-carrier spacing can be used. This bit is not used for the long sequence random access preamble format, and is still used to indicate the message 1 subcarrier spacing for the short sequence random access preamble format.
- the terminal After receiving the TAC value indicated by the base station, the terminal determines the TA value according to the value and the subcarrier spacing of the Msg3.
- the way to determine is to multiply the TAC value by the unit, which is related to the subcarrier spacing of Msg3, as shown in the following table:
- Ts 1 / (64 * 30.72 * 10 ⁇ 6) seconds.
- the random access preambles of different sequence formats use the same TAC or TA.
- TAC candidate TAC or TA values
- the two TAC values for each sequence format in the above table are only examples, and there may be four, six, eight, etc., each of which corresponds to a set of TACs.
- the base station sends the TAC corresponding to the random access preamble sequence to the terminal, and the terminal can determine the TA value according to the subcarrier spacing of the TAC and the Msg3. For example, if the random access preamble format is 1, and the base station determines that the largest TAC among the multiple terminals is 2800, the larger value 2856 can be sent to the terminal; if the maximum TAC is 1200, the smaller value 1318 is sent to the terminal.
- the terminal can be. That is, the TAC that the base station can transmit to the terminal is greater than the determined maximum TAC and is close to the maximum TAC.
- the base station may indicate the TAC to the terminal, and the terminal determines the TA according to the TAC, or the base station may directly calculate the TA according to the TAC, and indicate the TA to the terminal.
- the base station sends the indication information to one or more terminals within the cell or beam service range, or to all terminals.
- the above scheme is also applicable to the short sequence random access preamble format.
- the base station determines the maximum value of the TAC values of the multiple terminals in the coverage of the serving cell or the service beam, and notifies each terminal of the set TAC value, where the set TAC value is greater than or equal to the maximum value, Further, the set TAC value may be close to the maximum value, and may also be related to the preamble format; the received terminal may determine the value of the TA according to the set TAC, and further determine the time interval between the message 2 and the message 3. .
- the TAC may also be a TA, except that the TA is determined by the base station and notified to the terminal, and the others are similar to the TAC and will not be described in detail.
- the base station indicates the distance value (distance between the base station and the terminal) employed by the terminal.
- the terminal determines the TA according to the distance, where there may be multiple candidate distance values, and the random access preamble format may not be distinguished, and one distance value may be uniformly used, or different random access preambles may use different distances. For example, if the candidate value is 2, the distance values corresponding to each sequence format are as follows:
- the candidate distance values may also be four, six, eight, and the like.
- the base station may know the distances of the multiple terminals in advance, for example, by using the message 1, to take the maximum of the plurality of distances, and then determine the distance of the calculated TA, which needs to be greater than or equal to the maximum of the plurality of distances, and then notify the terminal. .
- the random access preamble format is 1, and the maximum distance of multiple terminal distances is 90, the smaller distance 100 in the table may be taken; if the maximum distance of multiple terminal distances is 160, 200 is needed. In other words, it can be taken larger and closest.
- the number of candidate distance values X and the specific value are not limited, and the value is less than or equal to 300.
- the base station uses ceil (log2(X)) for indication, and ceil indicates rounding up.
- the specific manner indicated by the base station includes indication by ceil (log2(X)) bit in PBCH/SI/SIB1/SIB2/RMSI/MSG2 DCI/MAC Header/MAC header/PDSCH/RAR.
- ceil log2(X)
- the distance selected by the base station should be greater than or equal to the distance of the farthest terminal in the cell.
- the base station determines the maximum distance among the plurality of terminals in the coverage of the serving cell or the service beam, and notifies each terminal of the set distance, wherein the set distance is greater than or equal to the maximum distance, and further, setting The distance value may be close to the maximum value, and may also be related to the preamble format, and the received terminal may determine the value of TA according to the set distance and further determine the time interval between message 2 and message 3.
- the short sequence usually refers to a sequence with a random access preamble sequence length of 139, which can be as follows:
- the base station may indicate the terminal in the PBCH/SI/SIB1/SIB2/RMSI/MSG2 DCI/MSG2 MAC Header/MSG2 RAR, and the base station uses beam scanning for whether the random access preamble reception process is received. For example, if the 1 bit indication is used, the indication bit is 0, indicating that the beam scanning is used for receiving; if the bit is 1, the representative base station does not use beam scanning to receive.
- the terminal determines one or more of the corresponding TA value, the number of OFDM symbols, and the TAC value according to the indication of the receiving mode of the message 1 (random access preamble) by the base station, and the corresponding message 1 format, and calculates the message 2 and The time interval between messages 3.
- the method similar to the short sequence random access preamble format is not described in detail here.
- the base station receives the message by means of beam scanning.
- the cyclic prefix and time domain sequence length corresponding to different sequence formats are as follows:
- the cell radius/coverage distance supported by different sequences can be obtained by the following formula:
- TCP path profile from the above table
- c is the speed of light.
- Ts 1/(2*30.72*10 ⁇ 6)
- Ts 1/(4*30.72*10 ⁇ 6)
- Ts 1 / (8 * 30.72 * 10 ⁇ 6).
- each short sequence random access preamble format can derive multiple radii, corresponding to different subcarrier spacings of message 1.
- the Ts is different for different subcarrier spacings, and the supported cell radii are different, so different TAs can be obtained.
- the four columns TA obtained in the above table correspond to 15KHz, 30KHz, 60KHz and 120KHz, respectively.
- the terminal may determine the corresponding TA according to the indication of the base station (the format of the message 1 and the subcarrier spacing of the message 1), and the format and subcarrier spacing of the message 1 used, that is, according to the type of the Preamble in the above table and the Msg1. Value, you can get a fixed TA value.
- the foregoing indication may be delivered by one or more of PBCH/SI/SIB1/SIB2/RMSI/PDCCH/Msg2 DCI/MAC header/MAC PDU/PDSCH/RAR.
- the TA corresponding to 15 kHz may be fixed, that is, a column of TA values corresponding to Msg1-15 KHz is uniformly used, and the corresponding TA is selected from the column corresponding to Msg1-15KHz according to different Preamble formats.
- the corresponding TA of 15KHz or 60KHz is fixed. That is, if the terminal is in a low frequency (the corresponding subcarrier spacing includes 15KHz, 30KHz), a row of TA corresponding to Msg1-15KHz is used, and the terminal can be selected according to the Preamble format; if the terminal is at a high frequency (the corresponding subcarrier spacing includes 60KHz, 120KHz), use a column of TA corresponding to Msg1-60KHz, and select from the Preamble format.
- the base station or the terminal may determine the TA according to the random access preamble of the terminal and the subcarrier spacing corresponding to the random access preamble, and each terminal uses a different TA, or all the terminals use the minimum subcarrier spacing.
- the TA or according to the frequency range of the terminal (low frequency or high frequency)
- the TA corresponding to the smaller subcarrier spacing of the preamble corresponding to the frequency range is used.
- the base station does not receive the message by means of beam scanning.
- the 2048 valid time domain sequence lengths are removed from the TSEQ, and the rest can all be used as the cyclic prefix CP, here referred to as the extended cyclic prefix ECP:
- the Path profile source table, c is the speed of light.
- Ts 1/(30.72*10 ⁇ 6)
- Ts 1/(2*30.72*10 ⁇ 6)
- Ts 1/(4*30.72*10 ⁇ 6)
- Ts 1/(8*30.72*10 ⁇ 6).
- the above scheme can be seen that, similar to the case of 1.1, for the random access preamble (message 1) of the same format, the Ts is different for different subcarrier spacings, and the supported cell radii are different, so different TAs can be obtained. It's just a little different.
- the four columns TA obtained in the above table correspond to 15KHz, 30KHz, 60KHz and 120KHz, respectively.
- the terminal may determine the corresponding TA according to the preamble format and the used message subcarrier spacing.
- the TA corresponding to 15KHz can also be fixed, or according to the FR1 and FR2 classification, the TA corresponding to 15KHz or 60KHz is fixed, and then the interval between the message 2 and the message 3 is calculated, similar to the above situation. , will not repeat them here.
- the TA is determined by the type of the random access preamble and the subcarrier spacing corresponding to the random access preamble, and each terminal may use a different TA, or all the terminals may use the TA corresponding to the minimum subcarrier spacing, or according to the TA.
- the frequency range of the terminal using the TA corresponding to the subcarrier spacing of the smaller message 1 in the frequency range.
- the base station directly instructs the terminal to have a TA value, and the terminal determines the time interval between message 2 and message 3 according to the TA; or indicates that the terminal has a TAC value, and the terminal determines according to the format of the message 1, the subcarrier spacing of the message 3, and the value of the TA. Corresponding TA value.
- the base station directly indicates the terminal TA value or the index value of the TA.
- the TA value indicated by the base station should be greater than or equal to the maximum TA value of all terminals in the cell/beam coverage.
- a 4-bit indication can be used, and the indicated candidate values are selected from the following table:
- the value indicating TA should be less than or equal to 2 ms to achieve the purpose of reducing the time interval between message 2 and message 3.
- the base station directly indicates the terminal TAC value/index.
- the TAC value indicated by the base station should be greater than or equal to the maximum value of the TAC in one or more terminals RAR in the cell/beam coverage.
- the value indicating the TAC should be less than or equal to 3846, so as to reduce the time interval between message 2 and message 3.
- the further indicated TAC or TA may be closest to the maximum TAC or TA of one or more terminals within the cell/beam coverage.
- the terminal After receiving the index, the terminal determines the maximum TA according to the subcarrier spacing of the message 3.
- the calculation formula is:
- the base station uses 1 bit to indicate the TAC values of the two candidates corresponding to different message 1 formats, as follows:
- the candidate TAC data and the number of bits used for indication are not limited, and the constraint distance is less than 3846.
- the manner indicated by the base station is included in the PBCH/SI/SIB1/SIB2/RMSI/MSG2DCI/MSG2 MAC Header/MSG2 RAR.
- the terminal receives the TAC and determines the maximum TA according to the subcarrier spacing of the message 3.
- the calculation formula is:
- 1 bit is used to indicate the 2 TA values corresponding to different message 1 formats, as shown in the following table:
- the number of candidate TACs and the number of bits used for indication are not limited, and the constraint distance may be less than 2 ms.
- the manner indicated by the base station is included in the PBCH/SI/SIB1/SIB2/RMSI/MSG2DCI/MSG2 MAC Header/MSG2 RAR.
- the specific manner indicated by the base station includes indication by ceil (log2(X)) bit in PBCH/SI/SIB1/SIB2/RMSI/MSG2 DCI/MSG2 MAC Header/MSG2 RAR, and ceil means rounding up.
- X is the number of candidate TAs or TACs.
- the above method is also applicable to the long sequence random access preamble format.
- the base station directly indicates to the terminal a distance value, or a TA value, or a TAC value, corresponding to a different message 1 format, the value is different, and the terminal calculates/determines the corresponding TA value.
- the base station uses 1 bit to indicate the candidate distance values of 2 corresponding to different message 1 formats, as shown in the following table:
- K is a larger distance value
- M is a smaller distance value, indicated by 0-1 of the indication bit.
- the distance value may be determined according to different random access preamble format coverage distances, or the base station may estimate the farthest terminal distance by using the message 1, and select a minimum value that is greater than the farthest distance.
- the candidate distance value data and the number of bits used for indication are not limited, and the constraint distance is less than 300 kilometers.
- the manner indicated by the base station is included in the PBCH/SI/SIB1/SIB2/RMSI/MSG2DCI/MSG2 MAC Header/MSG2 RAR.
- the terminal determines a corresponding distance value according to the indication, and determines a time interval between the message 2 and the message 3 according to the following formula:
- the base station calculates their TAs, selects the largest TA, and notifies all terminal devices, so that each terminal device determines random access according to the maximum TA.
- the gap between the message 2 and the message 3 for example, the base station transmits the random access preamble/DMRS/SRS sent by the terminal, and can calculate the TA of each user, and then select the largest TA notification terminal for the terminal to determine.
- N1, N2, and L2 are unchanged in the original way.
- the manner of indication includes passing the msg2 DCI, MAC PDU or RAR.
- the base station notifies the terminal that the TA may be a set value, and the set value needs to be greater than or equal to the maximum TA. Further, the set value closest to the maximum TA may be adopted.
- the index 0-7 step is 9us, which is equal to the length of a symbol of 120KHz
- the index 8-15 step is 125us, 250us, 500us is 120KHz, 60KHz, 30KHz, the length of a slot; for example, in all terminals
- the specific manner of the indication is that if the maximum TA of the serving user in the beam/cell is X, the smallest TA greater than X in the above table is selected, and the corresponding 4bit index is indicated in the Msg2 DCI/MAC PDU (PDSCH)/RAR. . After the terminal acquires the TA according to the index, the Gap between msg2 and msg3 is calculated.
- the base station directly indicates the length of time to wait before sending msg3. It is characterized by the number of slots that need to be waited after receiving the message 2 by one or more of the SIB1/SIB2/RMSI/Msg2 DCI/MAC PDU/RAR.
- the candidate slot set is ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 16, 20, 32 ⁇ , and the slot is based on the PUSCH of the Msg3.
- the duration of the segment includes both the shortest gap between the terminal receiving and transmitting Msg2, and the duration of the BWP (Bandwith part) switching by the terminal.
- each terminal uses its own TA, that is, for each user of the beam/cell service, the user calculates the gap between msg2 and msg3 according to its own TA.
- the TA of each user is sent by the TAC in the RAR. That is, the base station determines the TA of each terminal and sends it to the terminal. The maximum TA is no longer used. It is also possible to select a value larger than the terminal TA for each TA.
- the terminal selects the smallest TA in the table that is greater than the value according to the TA in the TAC field, that is, the closest TA, for calculating the gap and determining the location of the sent message 3:
- the TA is also selected in the same manner, the gap between the Msg2 and the Msg3 of the terminal is calculated, and the user message 3 is received at the corresponding location.
- the proposal of the terminal to determine the scheme of the TA according to the TAC indicated by the base station in the standard is:
- the duration of TA in the time gap between Msg2 and Msg3, N1+duration of N2+L2+TA, is indicated by Msg2 with[2]bits explicitly or figured out implicitly based on the maximum one of TACs contained in Msg2,which is Common for all the UEs receiving the Msg2.
- the base station sends to the terminal by configuring a scaling factor of the maximum TA, and the terminal determines the TA according to the scaling factor, thereby reducing the gap between the message 2 and the message 3.
- This solution can be combined with the various solutions mentioned in the above embodiments.
- the base station indicates a scaling factor in one or more of the SIB1/SIB2/RMSI/Msg2 DCI/MAC PDU/Msg2 MAC PDU.
- the terminal determines the Maximum TA according to the above embodiment, multiplies the scaling factor as the final TA, and determines the time interval between msg2 and msg3.
- the base station determines the maximum of all terminals served.
- TA is X ms
- the base station adopts a scaling factor indicated by a 3-bit index.
- the X may be a maximum TA (Msg3-based SCS) corresponding to the 3846/1282 supported by the 12bit, or may be a TA indicated by the base station or a TA determined by the terminal in the foregoing embodiment of the present application, which is not limited herein.
- the scaling factor can also be associated with the preamble, with different preambles setting different scaling factors.
- the embodiment of the present application further discloses the network device and the terminal device in the foregoing method embodiment.
- the following includes one or more modules, a sending module 201, a receiving module 203, and a processing module 202.
- the network device is completely corresponding to the network device or the terminal device in the embodiment of the terminal device and the method, and the corresponding module performs corresponding steps, for example, the sending module method performs the steps sent in the method embodiment, and the receiving module performs the method in the embodiment.
- the steps, except for sending and receiving, can be performed by the processing module.
- the processing module For the function of the specific module, refer to the corresponding method embodiment, for example:
- a device for reducing delay which is a chip or a module of a terminal device or a terminal device, including:
- a sending module configured to send a message 1 to a network device, where the message 1 is a random access preamble;
- a receiving module configured to receive a message 2 sent by the network device
- the sending module is further configured to: after a time interval, send a message 3 to the network device, where the time interval includes a timing advance TA;
- a device for reducing delay which is a chip or a module of a network device or a network device, comprising:
- the receiving module is configured to receive the message 1 sent by the terminal device, where the message 1 is a random access preamble;
- a sending module configured to send a message 2 to the terminal device
- the receiving module is further configured to: after receiving a time interval, receive the message 3 sent by the terminal device, where the time interval includes a timing advance TA;
- the TA is related to the format of the message 1 of the terminal device
- the TA is related to a message 1 format of the terminal device and a cell radius supported by the message 1;
- the TA is related to a message 1 format of the terminal device and a subcarrier spacing supported by the message 1;
- the TA is related to a message 1 format of the terminal device, a cell radius supported by the message 1, and a subcarrier spacing supported by the message 1;
- the TA is related to a message 1 format of the terminal device, and a minimum subcarrier interval and/or a maximum cell radius of the message 1 in a frequency range to which the terminal device belongs;
- the TA is determined by a time advance command TAC value indicated by the network device, where the TAC is less than or equal to 3846, and is greater than or equal to a maximum TAC of one or more terminal devices served by the network device;
- the TA may also be determined by a distance indicated by the network device, where the distance is less than or equal to 300 KM, and greater than or equal to a maximum distance among one or more terminal devices served by the network device; or
- the TA is a TA indicated by the network device, where the TA is less than or equal to 2 ms, and is greater than or equal to a maximum TA of one or more terminal devices served by the network device.
- the sending module of the network device is further configured to send, to the terminal device, whether the network device receives the indication information of the random access preamble by using a beam scanning manner; and the receiving module of the terminal device is further configured to receive the indication information.
- the sending module of the network device is further configured to send a TA scaling factor to the terminal device, where the TA scaling factor is less than 1; and the receiving module of the terminal device is further configured to receive the TA scaling factor.
- each device may further include a processing module, which is used to perform other steps in the method embodiment except for sending and receiving, such as calculating, determining the TA, and the like.
- a processing module which is used to perform other steps in the method embodiment except for sending and receiving, such as calculating, determining the TA, and the like.
- the foregoing network device and terminal device are only examples, and may be configured according to different method embodiments, and corresponding modules are used to form corresponding devices.
- the processor may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device.
- the transmitter and receiver can form a transceiver. It is also possible to further include an antenna, and the number of antennas may be one or more.
- a memory may be further included for storing related information such as a program or a code, and the memory may be a single device or integrated in the processor.
- bus includes a power bus, a control bus, and a status signal bus in addition to the data bus.
- bus includes a power bus, a control bus, and a status signal bus in addition to the data bus.
- the various buses are labeled as buses in the figure.
- Figure 3 above is only a schematic diagram, and may include other components or only some components, including, for example, a transmitter and a receiver; or only a transmitter, a receiver, and a processor.
- the various devices or parts of the device of FIG. 3 above may be integrated into the chip for implementation, such as integration into a baseband chip.
- a memory (not shown) may be further included for storing computer executable program code, wherein when the program code includes an instruction, when the processor executes The instructions cause the network device or terminal device to perform the corresponding steps in the method embodiments.
- the memory can be a separate physical unit that can be connected to the processor via a bus.
- the memory and processor can also be integrated together, implemented by hardware, and the like.
- the memory is used to store a program implementing the above method embodiments, or various modules of the device embodiment, and the processor calls the program to perform the operations of the above method embodiments.
- the device may also include only the processor.
- the memory for storing the program is located outside the device, and the processor is connected to the memory through the circuit/wire for reading and executing the program stored in the memory.
- the processor can be a central processing unit (CPU), a network processor (NP) or a combination of CPU and NP.
- CPU central processing unit
- NP network processor
- the processor may further include a hardware chip.
- the hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
- the PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL), or any combination thereof.
- the memory may include a volatile memory such as a random-access memory (RAM); the memory may also include a non-volatile memory such as a flash memory.
- RAM random-access memory
- non-volatile memory such as a flash memory.
- HDD hard disk drive
- SSD solid-state drive
- the memory may also include a combination of the above types of memories.
- the embodiment of the present application further provides a computer storage medium, which is stored with a computer program, which is used to execute the method provided by the foregoing embodiment.
- the embodiment of the present application further provides a computer program product comprising instructions, which when executed on a computer, causes the computer to execute the method provided by the above embodiments.
- the computer program product includes one or more computer instructions.
- the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
- the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
- the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
- the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
- At least one means one or more, and "a plurality” means two or more.
- the character "/” generally indicates that the contextual object is an "or” relationship.
- "At least one of the following” or a similar expression thereof refers to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c may represent: a, b, c, ab, ac, bc, or abc, where a, b, c may be single or multiple .
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Abstract
Description
消息3子载波间隔 | 单位unit | Maximum TA(ms) |
15KHz | 16*64*Ts | 2 |
30KHz | 8*64*Ts | 1 |
60KHz | 4*64*Ts | 0.5 |
120KHz | 2*64*Ts | 0.25 |
消息3子载波间隔 | 单位Unit |
15KHz | 16*64*Ts |
30KHz | 8*64*Ts |
60KHz | 4*64*Ts |
120KHz | 2*64*Ts |
前导格式 | 较大TAC值 | 较小TAC值 |
0 | 200 | 100 |
1 | 2856 | 1318 |
2 | 3846 | 295 |
3 | 1354 | 200 |
前导格式 | 较大距离(km) | 较小距离(km) |
0 | 20 | 10 |
1 | 200 | 100 |
2 | 300 | 100 |
3 | 100 | 10 |
索引index | TA(us) | 索引index | TA(us) |
0 | 9 | 8 | 125 |
1 | 18 | 9 | 250 |
2 | 27 | 10 | 375 |
3 | 36 | 11 | 500 |
4 | 45 | 12 | 750 |
5 | 54 | 13 | 1000 |
6 | 63 | 14 | 1500 |
7 | 72 | 15 | 2000 |
index | TAC value | index | TAC value |
0 | 480 | 1 | 961 |
2 | 1923 | 3 | 3846 |
消息3子载波间隔 | 单位unit |
15KHz | 16*64*Ts |
30KHz | 8*64*Ts |
60KHz | 4*64*Ts |
120KHz | 2*64*Ts |
消息3子载波间隔 | 单位unit |
15KHz | 16*64*Ts |
30KHz | 8*64*Ts |
60KHz | 4*64*Ts |
120KHz | 2*64*Ts |
索引index | TA(us) | 索引index | TA(us) |
0 | 9 | 8 | 125 |
1 | 18 | 9 | 250 |
2 | 27 | 10 | 375 |
3 | 36 | 11 | 500 |
4 | 45 | 12 | 750 |
5 | 54 | 13 | 1000 |
6 | 63 | 14 | 1500 |
7 | 72 | 15 | 2000 |
索引index | Maximum TA(us) | 索引index | Maximum TA(us) |
0 | 9 | 8 | 125 |
1 | 18 | 9 | 250 |
2 | 27 | 10 | 375 |
3 | 36 | 11 | 500 |
4 | 45 | 12 | 750 |
5 | 54 | 13 | 1000 |
6 | 63 | 14 | 1500 |
7 | 72 | 15 | 2000 |
Claims (12)
- 一种降低时延的方法,应用于随机接入过程中,包括:终端设备向网络设备发送消息1,所述消息1为随机接入前导;所述终端设备接收所述网络设备发送的消息2;间隔一个时间间隔后,所述终端设备向所述网络设备发送消息3,所述时间间隔包括时间提前量TA;其中,所述TA与该终端设备的消息1格式相关;所述TA与该终端设备的消息1格式及消息1支持的小区半径相关;所述TA与该终端设备的消息1格式及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式、消息1支持的小区半径、及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式,及所述终端设备所属的频率范围内消息1的最小子载波间隔和/或最大小区半径相关;所述TA由网络设备指示的时间提前命令TAC值确定,其中TAC小于或等于3846,且大于或等于网络设备服务的一个或多个终端设备中最大TAC;所述TA还可以由该网络设备指示的距离确定,其中距离小于或等于300KM,且大于或等于网络设备服务的一个或多个终端设备中最大距离;或;所述TA为该网络设备指示的TA,其中该TA小于或等于2ms,且大于或等于网络设备服务的一个或多个终端设备中最大TA。
- 如权利要求1所述的方法,该方法之前进一步包括:终端设备接收网络设备发送的指示信息,该指示信息用于通知所述终端设备该网络设备是否采用波束扫描方式接收所述随机接入前导。
- 如权利要求1所述的方法,其中,所述TAC、TA或距离值由网络设备通过物理广播信道PBCH、***信息SI、剩余***信息RMSI、***信息块1、***信息块2、消息2下行控制信息MSG2 DCI、消息2媒体接入控制头MSG2 MAC Header、消息2随机接入响应MSG2 RAR中一种或多种进行指示。
- 如权利要求1所述的方法,其中,所述网络设备指示的TAC、TA或距离值还与所述终端设备的消息1格式相关。
- 如权利要求1所述的方法,其中,所述TA还进一步的与网络设备指示的缩放因子相关,所述缩放因子小于1。
- 一种降低时延的方法,应用于随机接入过程中,包括:网络设备接收终端设备发送的消息1,所述消息1为随机接入前导;所述网络设备向所述终端设备发送消息2;间隔一个时间间隔后,所述网络设备接收所述终端设备发送的消息3,所述时间间隔包括时间提前量TA;其中,所述TA与该终端设备的消息1格式相关;所述TA与该终端设备的消息1格式及消息1支持的小区半径相关;所述TA与该终端设备的消息1格式及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式、消息1支持的小区半径、及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式,及所述终端设备所属的频率范围内消息1 的最小子载波间隔和/或最大小区半径相关;所述TA由网络设备指示的时间提前命令TAC值确定,其中TAC小于或等于3846,且大于或等于网络设备服务的一个或多个终端设备中最大TAC;所述TA还可以由该网络设备指示的距离确定,其中距离小于或等于300KM,且大于或等于网络设备服务的一个或多个终端设备中最大距离;或;所述TA为该网络设备指示的TA,其中该TA小于或等于2ms,且大于或等于网络设备服务的一个或多个终端设备中最大TA。
- 一种降低时延的装置,该装置为终端设备或终端设备的芯片或模块,包括:发送模块:用于向网络设备发送消息1,所述消息1为随机接入前导;接收模块:用于接收所述网络设备发送的消息2;所述发送模块还用于:间隔一个时间间隔后,向网络设备发送消息3,所述时间间隔包括时间提前量TA;其中,所述TA与该终端设备的消息1格式相关;所述TA与该终端设备的消息1格式及消息1支持的小区半径相关;所述TA与该终端设备的消息1格式及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式、消息1支持的小区半径、及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式,及所述终端设备所属的频率范围内消息1的最小子载波间隔和/或最大小区半径相关;所述TA由网络设备指示的时间提前命令TAC值确定,其中TAC小于或等于3846,且大于或等于网络设备服务的一个或多个终端设备中最大TAC;所述TA还可以由该网络设备指示的距离确定,其中距离小于或等于300KM,且大于或等于网络设备服务的一个或多个终端设备中最大距离;或;所述TA为该网络设备指示的TA,其中该TA小于或等于2ms,且大于或等于网络设备服务的一个或多个终端设备中最大TA。
- 一种降低时延的装置,该装置为网络设备或网络设备的芯片或模块,包括:接收模块:用于接收终端设备发送的消息1,所述消息1为随机接入前导;发送模块:用于向所述终端设备发送消息2;所述接收模块:还用于间隔一个时间间隔后,接收所述终端设备发送的消息3,所述时间间隔包括时间提前量TA;其中,所述TA与该终端设备的消息1格式相关;所述TA与该终端设备的消息1格式及消息1支持的小区半径相关;所述TA与该终端设备的消息1格式及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式、消息1支持的小区半径、及消息1支持的子载波间隔相关;所述TA与该终端设备的消息1格式,及所述终端设备所属的频率范围内消息1的最小子载波间隔和/或最大小区半径相关;所述TA由网络设备指示的时间提前命令TAC值确定,其中TAC小于或等于3846,且大于或等于网络设备服务的一个或多个终端设备中最大TAC;所述TA还可以由该网络设备指示的距离确定,其中距离小于或等于300KM,且大于或等于网络设备服务的一个或多个终端设备中最大距离;或;所述TA为该网络设备指示的TA,其中该TA小于或等于2ms,且大于或等于网络设备服务的一个或多个终端设备中最大TA。
- 如权利要求8所述的装置,其中,所述发送模块还用于向所述终端设备发送该网络设备是否采用波束扫描方式接收所述随机接入前导的指示信息。
- 如权利要求8所述的装置,其中,所述发送模块还用于向所述终端设备发送TA缩放因子,所述TA缩放因子小于1。
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质包括程序,当所述程序被计算机运行时用于执行如权利要求1-6任一项所述的方法。
- 一种计算机程序产品,其特征在于,包括程序或指令,当所述程序或指令在计算机上运行时,如权利要求1-6任一项所述的方法被执行。
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EP3829232B1 (en) * | 2018-07-25 | 2024-04-17 | Beijing Xiaomi Mobile Software Co., Ltd. | Message transmission method and device |
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