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WO2017121380A1 - Procédé et appareil d'accès aléatoire - Google Patents

Procédé et appareil d'accès aléatoire Download PDF

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Publication number
WO2017121380A1
WO2017121380A1 PCT/CN2017/071105 CN2017071105W WO2017121380A1 WO 2017121380 A1 WO2017121380 A1 WO 2017121380A1 CN 2017071105 W CN2017071105 W CN 2017071105W WO 2017121380 A1 WO2017121380 A1 WO 2017121380A1
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WIPO (PCT)
Prior art keywords
random access
preamble
rnti
prachwinlen
communication node
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/071105
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English (en)
Chinese (zh)
Inventor
陆婷
戴博
余媛芳
邹伟
戴谦
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ZTE Corp
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ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201610286416.3A external-priority patent/CN106973441B/zh
Priority to EP17738193.6A priority Critical patent/EP3404991B1/fr
Priority to ES17738193T priority patent/ES2809724T3/es
Priority to US16/068,853 priority patent/US10736149B2/en
Priority to KR1020187023225A priority patent/KR102687897B1/ko
Priority to JP2018536228A priority patent/JP6936232B2/ja
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to EP20186397.4A priority patent/EP3755110B1/fr
Priority to EP23171205.0A priority patent/EP4221436A1/fr
Publication of WO2017121380A1 publication Critical patent/WO2017121380A1/fr
Anticipated expiration legal-status Critical
Priority to US16/937,133 priority patent/US11051346B2/en
Priority to US17/346,047 priority patent/US11818762B2/en
Ceased legal-status Critical Current

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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, but is not limited to, the field of communications, and in particular, to a random access method and apparatus.
  • Machine Type Communication is an important subject of the fifth generation of mobile communication technology (5G) and an important application field for wireless communication in the future.
  • MTC Machine Type Communication
  • NB-IoT Narrow Band-Internet of Things
  • the terminal characteristics such as low cost, low power consumption, low mobility, and low throughput.
  • Hzz Hzz
  • low-throughput wireless communication services are provided for NB-IoT low-cost terminals (UE, User Equipment).
  • the terminal adopts a contention access mechanism, first transmitting a preamble, and then transmitting the position of the third subframe after the last subframe of the preamble.
  • a random access (RA, Random Access) response window is started, and a random access response (RAR, Random Access Response) message is received.
  • the length of the RA response window is configured by system messages, and the maximum length is 10 radio subframes (ie, 1 radio frame).
  • the terminal demodulates the Physical Downlink Control Channel (PDCCH) by using a random access-Radio Network Temporary Identity (RA-RNTI) in the RA response window, and then demodulates the physical downlink shared channel (
  • the PDSCH Physical Downlink Shared Channel
  • the MAC Medium Access Control (MAC) Protocol Data Unit (PDU) including its RAR.
  • the time-frequency position of the preamble determines the value of the RA-RNTI, and the base station and the terminal each calculate a consistent RA-RNTI value according to the time-frequency position of the preamble.
  • the calculation formula of RA-RNTI is as follows:
  • RA-RNTI 1+t_id+10 ⁇ f_id
  • the t_id is a sequence number of the first subframe in which the preamble is transmitted, that is, the first subframe, and the value ranges from [1, 10), that is, 0 ⁇ t_id ⁇ 10, and the f_id is a physical random access channel in the subframe ( PRACH, Physical Random Access Channel), in ascending order, in the range of [0, 6), that is, 0 ⁇ f_id ⁇ 6.
  • PRACH Physical Random Access Channel
  • f_id is always equal to 0
  • the above formula can be simplified as:
  • t_id indicates the sequence number of the first subframe in which the terminal sends the preamble.
  • Radio frame therefore, the RA response windows of the two terminals receiving the RAR cannot overlap, and the collision can be avoided by the isolation of the RA response window; (3) if the two terminals transmit the preamble in different subframes of different radio frames, Calculate different RA-RNTIs to avoid collisions.
  • the calculation of the RA-RNTI only needs to reflect the difference of the different preamble transmission start subframes.
  • the related research introduces the repetition function of uplink transmission and downlink transmission, that is, whether the terminal sends an uplink message or a base station.
  • the reception effect is guaranteed by a certain number of repetitions.
  • the time required for the terminal to receive the downlink message or the base station to receive the uplink message may be extended. Therefore, in the related research, the value range of the RA response window is expanded, and the maximum is 400 subframes, that is, 40 radio frames.
  • the concept of coverage level is introduced in the related research to reflect the difference in coverage of different terminals. It can be considered that the uplink and downlink channels of terminals with the same coverage level can adopt the same repetition factor, and the length of the RA response window can also be same.
  • FIG. 1 is a schematic diagram showing an overlap of RA response windows of two terminals caused by an extension of the RA response window.
  • the subframe marked by the grid is the starting subframe position of the transmitting preamble
  • the slash marked sub-frame is the RA response window position.
  • the two terminals may need to demodulate the PDCCH twice in the overlapping RA response window, which increases power consumption.
  • the two terminals happen to adopt the same preamble sequence number, their RAR content is the same, and will need to be processed through the subsequent conflict resolution process. At least one terminal access failure is equivalent to the introduction. Additional conflicts.
  • the embodiment of the invention provides a random access method and device, which can ensure that when the random access (RA, Random Access) response windows of the terminal overlap, no additional conflicts are generated, and the power consumption of the terminal is reduced.
  • RA Random Access
  • a random access method includes: a communication node acquiring random access information, where the random access information includes: a sequence number of a subframe for transmitting a preamble, a sequence number of a radio frame for transmitting a preamble; and the communication The node determines the RA-RNTI according to the random access information.
  • the embodiment of the present invention further provides a random access method, including: the communication node acquires random access information, where the random access information includes: a time domain location index information for transmitting a preamble, and a frequency domain location index information for transmitting a preamble.
  • the communication node determines the RA-RNTI based on the random access information.
  • the embodiment of the present invention further provides a random access method, including: a communication node acquiring random access information, where the random access information includes: a time domain location index information of a preamble sent by a terminal, and a frequency domain location where the terminal sends a preamble Index information; the communication node determines the RA-RNTI based on the random access information.
  • An embodiment of the present invention further provides a random access method, including: a communication node acquiring a random access information correlation factor; and the communication node determining an RA-RNTI according to the random access information correlation factor.
  • the embodiment of the present invention further provides a random access device, which is applied to a communication node, and includes: an information acquiring module, configured to acquire random access information, where the random access information includes: sending The sequence number of the preamble subframe, the sequence number of the radio frame transmitting the preamble, and the processing module, configured to determine the RA-RNTI according to the random access information.
  • a random access device which is applied to a communication node, and includes: an information acquiring module, configured to acquire random access information, where the random access information includes: sending The sequence number of the preamble subframe, the sequence number of the radio frame transmitting the preamble, and the processing module, configured to determine the RA-RNTI according to the random access information.
  • the embodiment of the present invention further provides a random access method, including: the communication node acquires random access information, and the communication node determines the random access response window related information according to the random access information.
  • the embodiment of the present invention further provides a random access method, including: a communication node acquiring random access information, where the random access information includes: a sequence number of a superframe for transmitting a preamble; and the communication node is randomly connected according to the The incoming information determines the RA-RNTI.
  • an embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement any of the above random access methods.
  • FIG. 1 is a schematic diagram showing an overlap of RA response windows of two terminals caused by an extension of the RA response window;
  • FIG. 3 is a schematic diagram of an application example 1 of the fifth embodiment
  • FIG. 5 is a schematic diagram of a random access device according to an embodiment of the present disclosure.
  • FIG. 6 is a flowchart of another random access method according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a random access method according to an embodiment of the present invention. as shown in picture 2,
  • the random access method provided in this embodiment includes the following steps:
  • Step 201 The communication node acquires random access information, where the random access information includes: a sequence number of a preamble transmitting subframe, and a sequence number of a radio frame that transmits the preamble;
  • Step 202 The communication node determines a random access radio network temporary identifier (RA-RNTI) according to the random access information.
  • RA-RNTI random access radio network temporary identifier
  • the communication node is, for example, a terminal or a base station.
  • the terminal may determine the RA-RNTI according to the random access information of the terminal, and the base station may determine the RA-RNTI according to the random access information of the corresponding terminal.
  • the random access information may include: a sequence number of a start or end subframe in which the preamble is transmitted, a sequence number of a start or end radio frame in which the preamble is transmitted.
  • the sequence number of the starting subframe for transmitting the preamble may be determined according to the sequence number of the subframe that sends the non-starting position of the preamble and the corresponding information, or may be based on the wireless sending the non-starting position of the preamble.
  • the sequence number of the frame and the corresponding information determine the sequence number of the starting radio frame for transmitting the preamble.
  • step 202 may include the communication node determining that the RA-RNTI is:
  • RA_RNTI n0+t_id+k1 ⁇ u_id;
  • t_id is the sequence number of the start (ie, the first) subframe of the preamble
  • u_id is the sequence number of the start (ie, the first) radio frame of the preamble.
  • the random access information may further include: a random access (RA) response window length, and an interval length of the preamble, where the interval length may be obtained by calculation or pre-configuration.
  • RA random access
  • step 202 may include the communication node determining that the RA-RNTI is:
  • RA_RNTI n0+t_id+k1 ⁇ v_id;
  • n0 and k1 are coefficients
  • t_id is the sequence number of the starting subframe in which the preamble is transmitted
  • v_id is a comprehensive factor determined according to one or a combination of the following:
  • the interval length at which the preamble is sent which can be obtained by calculation or pre-configuration.
  • V_id u_id mod WLen
  • V_id u_id mod(WLen/10); or,
  • V_id (u_id ⁇ 10) mod WLen
  • u_id is the sequence number of the starting radio frame of the preamble
  • WLen is the length of the RA response window, in units of subframes
  • mod represents modulo
  • WLen can be replaced by WLen'
  • WLen' WLen-2.
  • V_id ((u_id ⁇ 10)/PRACHWinLen)mod WLen; or,
  • V_id ((u_id ⁇ 10)/PRACHWinLen) mod(WLen/PRACHWinLen); or,
  • V_id ((u_id ⁇ 10)/PRACHWinLen) mod(WLen/PRACHWinLen+1);
  • u_id is the sequence number of the starting radio frame for transmitting the preamble
  • PRACHWinLen is the interval length for transmitting the preamble.
  • the interval length can be obtained by calculation or pre-configuration.
  • WLen is the length of the RA response window, in units of subframes, mod indicates modulo .
  • WLen can be replaced by WLen'
  • WLen' WLen-2.
  • V_id ((u_id ⁇ 10)/PRACHWinLen)mod WLen; or,
  • V_id ((u_id ⁇ 10)/PRACHWinLen)mod ceil(WLen/PRACHWinLen); or,
  • V_id ((u_id ⁇ 10)/PRACHWinLen) mod(floor(WLen/PRACHWinLen)+1);
  • u_id is the sequence number of the starting radio frame for transmitting the preamble
  • PRACHWinLen is the interval length for transmitting the preamble.
  • the interval length can be obtained by calculation or pre-configuration.
  • WLen is the length of the RA response window, in units of subframes, mod indicates modulo ,ceil() means round up (ie Represents the return of the smallest integer greater than or equal to the specified expression.
  • floor() means rounding down (that is, returning the largest integer less than or equal to the specified expression).
  • WLen can be replaced by WLen'
  • WLen' WLen-2.
  • V_id (u_id/PRACHWinLen)mod(WLen/10); or,
  • V_id (u_id/PRACHWinLen)mod(WLen/(PRACHWinLen ⁇ 10)); or,
  • V_id (u_id/PRACHWinLen)mod((WLen/(PRACHWinLen ⁇ 10))+1);
  • u_id is the sequence number of the starting radio frame for transmitting the preamble
  • PRACHWinLen is the interval length for transmitting the preamble.
  • the interval length can be obtained by calculation or pre-configuration.
  • WLen is the length of the RA response window, in units of subframes, mod indicates modulo .
  • WLen can be replaced by WLen'
  • WLen' WLen-2.
  • V_id (u_id/PRACHWinLen)mod(WLen/10); or,
  • V_id (u_id/PRACHWinLen)mod ceil(WLen/(PRACHWinLen ⁇ 10)); or,
  • V_id (u_id/PRACHWinLen)mod(floor(WLen/(PRACHWinLen ⁇ 10))+1);
  • u_id is the sequence number of the starting radio frame for transmitting the preamble
  • PRACHWinLen is the interval length for transmitting the preamble.
  • the interval length can be obtained by calculation or pre-configuration.
  • WLen is the length of the RA response window, in units of subframes, mod indicates modulo , ceil () means rounded up, floor () means rounded down.
  • WLen can be replaced by WLen'
  • WLen' WLen-2.
  • step 202 may include the communication node determining that the RA-RNTI is:
  • RA_RNTI n0+(((t_id+u_id ⁇ 10)/PRACHWinLen)mod WLen); or,
  • RA_RNTI n0+(((t_id+u_id ⁇ 10)/PRACHWinLen) mod(WLen/PRACHWinLen)); or,
  • RA_RNTI n0+(((t_id+u_id ⁇ 10)/PRACHWinLen) mod(WLen/PRACHWinLen+1));
  • t_id is the sequence number of the starting subframe of the preamble
  • u_id is the preamble.
  • PRACHWinLen is the interval length of the preamble. The interval length can be obtained by calculation or pre-configuration.
  • WLen is the length of the RA response window
  • mod is the modulo
  • n0 is the coefficient.
  • n0 is, for example, 1.
  • WLen can be replaced by WLen'
  • WLen' WLen-2.
  • PRACHWinLen represents the interval length of the preamble transmitted in the same subframe, that is, the interval length between adjacent (closest) two preambles transmitted in the same subframe of different radio frames, in frame Units are in units of sub-frames.
  • PRACHWinLen indicates the interval length at which the preamble is transmitted in the same subframe, and the interval length can be calculated by:
  • PRACHWinLen COM PRACH /N PRACH_PerFrame ;
  • COM PRACH is the least common multiple of P preamble and N PRACH_PerFrame ;
  • N PRACH_PerFrame indicates the number of PRACH resources configured in each radio frame
  • P preamble indicates the repetition factor of the preamble
  • PRACHWinLen 10 ⁇ P preamble /N PRACH_PerFrame ;
  • the PRACHWinLen indicates the interval length of the preamble
  • the N PRACH_PerFrame indicates the number of PRACH resources configured in each radio frame
  • the P preamble indicates the repetition factor of the preamble.
  • PRACHWinLen indicates the interval length at which the preamble is transmitted, and is determined according to one or a combination of the following:
  • the starting subframe number of the PRACH resource
  • the number of PRACH resources configured in each radio frame is the number of PRACH resources configured in each radio frame
  • the repeating factor of the preamble is the repeating factor of the preamble.
  • PRACHWinLen represents the interval length of the pre-configured transmission preamble, and the unit may be one of the following: a frame, a subframe, and a maximum number of transmission preambles.
  • the sequence number of the radio frame currently available for transmitting the preamble is greater than or equal to MAX FrameIndex - PRACHWinLen, skip the frames and re-detect the wireless that can be used to transmit the preamble from the radio frame with sequence number 0. Frame, where MAX FrameIndex is the maximum value of the radio frame number.
  • the random access method provided in this embodiment may further include: when the determined RA-RNTI exceeds a maximum value within a predetermined value range, the communication node determines that the RA-RNTI is Predetermined value.
  • step 202 may include:
  • the calculation of the RA-RNTI also corresponds to the coverage level.
  • terminals at different coverage levels can search for PDCCH in different search spaces, that is, even if the RA-RNTIs of the two terminals are the same, the response windows overlap, and they need to be solved because they are at different coverage levels.
  • the PDCCH is also different, and no additional collisions are generated. Therefore, in the study of the optimization of the RA-RNTI calculation formula, the present application does not temporarily consider the influence of different coverage levels in order to simplify the design.
  • the embodiment of the present invention further provides a random access method, including: the communication node acquires random access information, where the random access information includes: a time domain location index information for transmitting a preamble, and a frequency domain location index information for transmitting a preamble.
  • the communication node determines the RA-RNTI based on the random access information.
  • frequency domain information may be added in the calculation of the RA-RNTI.
  • determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA_RNTI n0+t_id+k1 ⁇ v_id+WLen ⁇ w_id;
  • t_id is the sequence number of the starting subframe in which the preamble is transmitted
  • w_id is the frequency domain position index of the transmitting preamble
  • WLen is the length of the RA response window
  • V_id is a composite factor determined according to one or a combination of the following:
  • the starting subframe number of the PRACH resource
  • the interval length at which the preamble is sent which can be obtained by calculation or pre-configuration.
  • V_id (u_id/PRACHWinLen)mod(WLen/10); or,
  • V_id (u_id/PRACHWinLen)mod ceil(WLen/(PRACHWinLen ⁇ 10)); or,
  • V_id (u_id/PRACHWinLen)mod(floor(WLen/(PRACHWinLen ⁇ 10))+1);
  • u_id is the sequence number of the starting radio frame for transmitting the preamble
  • PRACHWinLen is the interval length for transmitting the preamble.
  • the interval length can be obtained by calculation or pre-configuration.
  • WLen is the length of the RA response window, in units of subframes, mod indicates modulo , ceil () means rounded up, floor () means rounded down.
  • PRACHWinLen represents the interval length of the preamble transmitted in the same subframe, that is, the interval length between adjacent (closest) two preambles transmitted in the same subframe of different radio frames, in frame Units are in units of sub-frames.
  • PRACHWinLen indicates the interval length at which the preamble is transmitted in the same subframe, and the interval length can be calculated by:
  • PRACHWinLen COM PRACH /N PRACH_PerFrame ;
  • COM PRACH is the least common multiple of P preamble and N PRACH_PerFrame ;
  • N PRACH_PerFrame indicates the number of PRACH resources configured in each radio frame
  • P preamble indicates the repetition factor of the preamble
  • WLen may be replaced by WLen', wherein
  • MAX(t_id) represents the maximum value in the range of t_id
  • MAX(u_id) represents the maximum value in the range of u_id
  • u_id is the sequence number of the starting radio frame of the preamble
  • t_id is the starting subframe of the preamble. Serial number.
  • the random access method in this embodiment may further include: when the determined RA-RNTI exceeds a maximum within a predetermined value range At the time of the value, the communication node determines that the RA-RNTI is a predetermined value.
  • the determining, by the communications node, the RA-RNTI according to the random access information may include:
  • the calculation of the RA-RNTI also corresponds to the coverage level.
  • the embodiment of the present invention further provides a random access method, including: the communication node acquires random access information, where the random access information includes: the time domain location index information of the preamble sent by the terminal, and the frequency domain location of the preamble sent by the terminal. Index information; the communication node determines the RA-RNTI based on the random access information.
  • the random access information may further include one or a combination of the following: an RA response window length, and an interval length of the preamble, which may be obtained by calculation or pre-configuration.
  • the determining, by the communications node, the RA-RNTI according to the random access information may include: the communications node determining that the RA-RNTI is:
  • RA_RNTI n0+s_id+w_id ⁇ PRACHWinLen;
  • n0 is a coefficient
  • s_id is a time domain location index of the preamble sent by the terminal
  • w_id is a frequency domain location index of the preamble sent by the terminal
  • PRACHWinLen is a length of the interval for transmitting the preamble, and the interval length can be obtained by calculation or pre-configuration.
  • n0 is, for example, 1.
  • PRACHWinLen represents the interval length of the preamble transmitted in the same subframe, that is, the interval length between adjacent (closest) two preambles transmitted in the same subframe of different radio frames, in frame Units are in units of sub-frames.
  • PRACHWinLen indicates the interval length at which the preamble is transmitted in the same subframe, and the interval length can be calculated by:
  • PRACHWinLen COM PRACH /N PRACH_PerFrame ;
  • COM PRACH is the least common multiple of P preamble and N PRACH_PerFrame ;
  • N PRACH_PerFrame indicates the number of PRACH resources configured in each radio frame
  • P preamble indicates the repetition factor of the preamble
  • PRACHWinLen 10 ⁇ P preamble /N PRACH_PerFrame ;
  • the PRACHWinLen indicates the interval length of the preamble
  • the N PRACH_PerFrame indicates the number of PRACH resources configured in each radio frame
  • the P preamble indicates the repetition factor of the preamble.
  • PRACHWinLen indicates the interval length at which the preamble is transmitted, and may be determined according to one or a combination of the following:
  • the starting subframe number of the PRACH resource
  • the number of PRACH resources configured in each radio frame is the number of PRACH resources configured in each radio frame
  • the repeating factor of the preamble is the repeating factor of the preamble.
  • PRACHWinLen represents the interval length of the pre-configured transmission preamble, and the unit may be one of the following: a frame, a subframe, and a maximum number of transmission preambles.
  • the determining, by the communications node, the RA-RNTI according to the random access information may include: the communications node determining that the RA-RNTI is:
  • RA_RNTI n0+w_id+s_id ⁇ PRACHFreLen;
  • n0 is a coefficient
  • s_id is a time domain location index for transmitting a preamble
  • w_id is a transmission
  • PRACHFreLen is the frequency domain interval length for transmitting the preamble or the maximum number of preambles that can be transmitted in the frequency domain multiplexing.
  • n0 is, for example, 1.
  • the maximum number of preambles that can be transmitted in the frequency domain multiplexing is, for example, the maximum number of terminals or the maximum number of preambles.
  • the PRACHFreLen indicates the length of the frequency domain interval for transmitting the preamble, and may be determined according to one of the following information or a combination thereof: the physical random access channel may be used to transmit the frequency domain resource configuration information of the preamble, and the frequency hopping mode.
  • the time domain location index information may include any of the following:
  • the sequence number of the radio frame to which the preamble is sent is sent.
  • the frequency domain location index information may include any of the following:
  • the random access method in this embodiment may further include: when the determined RA-RNTI exceeds a maximum within a predetermined value range At the time of the value, the communication node determines that the RA-RNTI is a predetermined value.
  • the determining, by the communications node, the RA-RNTI according to the random access information may include:
  • the calculation of the RA-RNTI also corresponds to the coverage level.
  • the embodiment of the present invention further provides a random access method, including: the communication node acquires a random access information correlation factor; and the communication node determines the RA-RNTI according to the random access information correlation factor.
  • the determining, by the communications node, the RA-RNTI according to the random access information correlation factor may include: the communications node determining that the RA-RNTI is:
  • n0 is a coefficient
  • N is the number of random access information correlation factors
  • c i is a random access information correlation factor
  • MAX(c i-1 ) represents the maximum value of c i-1 .
  • n0 is, for example, 1.
  • the random access information correlation factor may include any one or a combination of the following:
  • the number of PRACH resources configured in each radio frame is the number of PRACH resources configured in each radio frame
  • the random access method in this embodiment may further include: when the determined RA-RNTI exceeds a maximum within a predetermined value range At the time of the value, the communication node determines that the RA-RNTI is a predetermined value.
  • the determining, by the communications node, the RA-RNTI according to the random access information correlation factor may include:
  • the calculation of the RA-RNTI also corresponds to the coverage level.
  • RA_RNTI 1+t_id+10 ⁇ u_id
  • the t_id is the sequence number of the first subframe in which the terminal sends the preamble
  • the u_id is the sequence number of the first radio frame in which the terminal transmits the preamble.
  • the range of the value of the u_id is [0, 1023], and the range of the value of the t_id is [1, 10). Therefore, the range of the RA-RNTI value obtained by the RA-RNTI calculation formula provided in this embodiment is [1] , 10240].
  • RA_RNTI 1+t_id+10 ⁇ v_id
  • the t_id is the sequence number of the first subframe in which the terminal sends the preamble
  • the v_id is the sequence number of the first radio frame in which the terminal transmits the preamble
  • the length of the RA response window in consideration of the current coverage level of the terminal and the interval at which the terminal transmits the preamble.
  • v_id ((u_id ⁇ 10)/PRACHWinLen) mod WLen
  • PRACHWinLen is the interval length of the transmitted preamble calculated based on the PRACH resource configuration and the repetition factor of the preamble under the current coverage level (hereinafter referred to as: repetition factor).
  • the terminal may calculate the PRACHWinLen according to the subframe number and the repetition factor that the base station configures for each radio frame that can be used to transmit the preamble.
  • WLen is the RA response window length (in wireless subframes) at the current coverage level.
  • RA_RNTI 1+t_id+10 ⁇ v_id
  • the t_id is the sequence number of the first subframe in which the terminal sends the preamble
  • the v_id is the sequence number of the first radio frame in which the terminal transmits the preamble, and considers the current coverage level of the terminal.
  • the composite factor of the length of the RA response window and the length of the interval at which the terminal transmits the preamble (in units of wireless subframes).
  • v_id ((u_id ⁇ 10)/PRACHWinLen) mod WLen
  • PRACHWinLen is the interval length of the transmitted preamble calculated based on the PRACH resource configuration and the repetition factor of the preamble in the current coverage level (hereinafter referred to as the repetition factor).
  • PRACHWinLen 10 ⁇ P preamble /N PRACH_PerFrame ,
  • P represents the preamble of the preamble repetition factor at the terminal level of current coverage
  • N PRACH_PerFrame denotes the number of the base station PRACH resource configuration of each radio frame.
  • WLen is the RA response window length (in units of wireless subframes) under the current coverage level.
  • RA_RNTI 1+(((t_id+u_id ⁇ 10)/PRACHWinLen)mod WLen),
  • the t_id is the sequence number of the start subframe of the preamble
  • the u_id is the sequence number of the start radio frame of the preamble.
  • the PRACHWinLen is the preamble sent by the terminal according to the PRACH resource configuration information and the repetition factor of the preamble of the current coverage level of the terminal.
  • the length of the interval, WLen is the length of the RA response window under the current coverage level of the terminal, and mod indicates the modulo.
  • PRACHWinLen should be the same.
  • the available PRACH resources can be grouped according to PRACHWinLen, and each group of available PRACH resources can only be occupied by one user. Therefore, the PRACHWinLen can be further divided into a plurality of PRACH resource groups in the RA response window, and the maximum number of users that can overlap each other with the RA response window can be considered to be equal to the available PRACH resources.
  • the number of groups +1 (the reference user and other users who can send the preamble and initiate the RA response window within the user's RA response window) and map the actual frame numbers of these users to a set of consecutive frames that may result in overlapping RA response windows. On the serial number.
  • RA_RNTI 1+t_id+10 ⁇ v_id
  • the t_id is the sequence number of the first subframe in which the terminal sends the preamble
  • the v_id is the sequence number of the first radio frame in which the terminal transmits the preamble, and considers the length of the RA response window in the current coverage level of the terminal and the preamble sent by the terminal.
  • V_id ((u_id ⁇ 10)/PRACHWinLen)mod(WLen/PRACHWinLen+1),
  • the u_id is the sequence number of the first radio frame in which the terminal sends the preamble; the PRACHWinLen indicates the interval length of the preamble to be transmitted, and the calculation manner is the same as that in the second embodiment or the third embodiment, and therefore is not described here; WLen is the RA under the current coverage level.
  • the response window length (in subframes).
  • the range of RA-RNTI values calculated based on the formula provided in this embodiment is [1, 10 ⁇ (WLen/PRACHWinLen+1)].
  • the maximum WLen 400 subframe, the repetition factor is 8, and each radio frame is configured with two radio subframes as PRACH resources, and the RA-RNTI value ranges from [1, 110].
  • the base station will reasonably configure the RA response window size according to the repetition factor.
  • the ratio of WLen to PRACHWinLen is non-integer, it needs to be rounded and then calculated according to the formula.
  • the rounding manner is, for example, rounding down.
  • the embodiments of the present invention are not limited thereto.
  • Embodiment 5 is exemplified below by a plurality of examples.
  • the repetition factor is 2
  • the first two subframes of each radio frame are PRACH resources
  • the RA response window is 20
  • the user situation that needs to distinguish the RA_RNTI is as shown in FIG. 3, where the grid marked subframe is a preamble transmission location.
  • the sub-frame marked by the slash is the RA response window position.
  • UE1 is the same as the RA_RNTI of UE3
  • UE2 is the same as the RA_RNTI of UE4, but is allowed because their response windows do not overlap.
  • each radio frame is configured with 10 subframes as PRACH resources, and the RA response window is 20, the user situation that needs to distinguish the RA_RNTI is as shown in FIG. 4, wherein the grid marked subframe is a preamble transmission location.
  • the slash marked sub-frame is the RA response window position.
  • UE1 is the same as the RA_RNTI of UE11, it is allowed because their response windows do not overlap.
  • RA_RNTI 1+(((t_id+u_id ⁇ 10)/PRACHWinLen) mod(WLen/PRACHWinLen+1)),
  • the t_id is the sequence number of the start subframe of the preamble
  • the u_id is the sequence number of the start radio frame of the preamble.
  • the PRACHWinLen is the preamble sent by the terminal according to the PRACH resource configuration information and the repetition factor of the preamble of the current coverage level of the terminal.
  • the length of the interval, WLen is the length of the RA response window under the current coverage level of the terminal, and mod indicates the modulo.
  • RA_RNTI 1+t_id+10 ⁇ v_id
  • the t_id is the sequence number of the first subframe in which the terminal sends the preamble
  • the v_id is the sequence number of the first radio frame in which the terminal transmits the preamble, and considers the length of the RA response window in the current coverage level of the terminal and the preamble sent by the terminal.
  • u_id is the sequence number of the first radio frame in which the terminal sends the preamble.
  • PRACHWinLen is the interval length of the transmitted preamble calculated based on the PRACH resource configuration and the repetition factor of the preamble under the current coverage level.
  • WLen is the RA response window length under the current coverage level of the terminal, and mod indicates the modulo.
  • RA_RNTI 1+(((t_id+u_id ⁇ 10)/PRACHWinLen) mod(WLen/PRACHWinLen)),
  • the t_id is the sequence number of the start subframe of the preamble
  • the u_id is the sequence number of the start radio frame of the preamble.
  • the PRACHWinLen is the preamble sent by the terminal according to the PRACH resource configuration information and the repetition factor of the preamble of the current coverage level of the terminal.
  • the length of the interval, WLen is the length of the RA response window under the current coverage level of the terminal, and mod indicates the modulo.
  • RA_RNTI 1+s_id+w_id ⁇ PRACHWinLen
  • the s_id is the sequence number of the starting subframe in which the terminal sends the preamble
  • the w_id is the starting frequency domain location index of the preamble sent by the terminal
  • the interval length of the preamble sent by the terminal is the PRACHWinLen.
  • RA_RNTI 1+w_id+s_id ⁇ PRACHFreLen
  • the s_id is the sequence number of the starting subframe for transmitting the preamble
  • the w_id is the frequency domain location index for transmitting the preamble
  • the PRACHFreLen is the frequency domain interval length for transmitting the preamble.
  • the PRACHFreLen may be determined according to one or a combination of the following information: the physical random access channel may be used to transmit the frequency domain resource configuration information of the preamble and the frequency hopping mode.
  • RA_RNTI n0+t_id+k1 ⁇ v_id
  • n0 and k1 are coefficients
  • t_id is the sequence number of the starting subframe in which the preamble is transmitted
  • v_id is a comprehensive factor determined according to one or a combination of the following:
  • the interval length at which the preamble is sent which can be obtained by calculation or pre-configuration.
  • V_id u_id mod WLen
  • V_id u_id mod(WLen/10); or,
  • V_id (u_id ⁇ 10) mod WLen
  • u_id is the sequence number of the first radio frame of the preamble sent by the terminal
  • WLen is the length of the RA response window in the current coverage level (in units of wireless subframes)
  • mod indicates modulo
  • FIG. 5 is a schematic diagram of a random access device according to an embodiment of the present invention. As shown in FIG. 5, the random access device provided in this embodiment is applied to a communication node, and includes:
  • the information obtaining module 501 is configured to acquire random access information.
  • the processing module 502 is configured to determine the RA-RNTI according to the random access information.
  • the random access information may include: a sequence number of the subframe in which the preamble is transmitted, and a sequence number of the radio frame in which the preamble is transmitted.
  • the random access information may include: time domain location index information for transmitting the preamble and frequency domain location index information for transmitting the preamble.
  • the random access information may include: the time domain location index information of the preamble sent by the terminal, and the frequency domain location index information of the preamble sent by the terminal.
  • the random access information may further include: an RA response window length, and an interval length of the transmission preamble, wherein the interval length may be obtained by calculation or pre-configuration.
  • the embodiment of the present invention further provides a random access device, which is applied to a communication node, and includes: an information acquiring module configured to acquire a random access information correlation factor; and a processing module configured to determine the RA according to the random access information correlation factor -RNTI.
  • the functions of the information acquisition module are implemented, for example, by a wireless communication unit and a calculator, such as a processor having a computing function.
  • a wireless communication unit such as a processor having a computing function.
  • the embodiments of the present invention are not limited thereto.
  • the functions of the above modules may also be implemented by a processor executing programs and/or instructions stored in the memory.
  • the FDD system is taken as an example.
  • the main scenario of generating additional collisions is that two terminals in the same coverage level send preambles in the same subframe of different radio frames, and their response window length exceeds one radio frame, and overlapping. Based on the existing RA-RNTI calculation formula containing only subframe information, the two are identical in the same search space for demodulating the RA-RNTI of the PDCCH, and an additional collision is generated.
  • the embodiment of the present invention introduces a factor that reflects the difference of the preamble transmission start radio frame or reflects the frequency domain location index information of the preamble in the RA-RNTI calculation formula, thereby ensuring that when the RA response window of the terminal overlaps, Generate additional conflicts and reduce terminal power consumption.
  • the embodiment further provides a random access method, including the following steps:
  • Step 601 The communication node acquires random access information.
  • Step 602 The communication node determines the random access response window related information according to the random access information.
  • the random access information may include one or a combination of the following:
  • a downlink control channel transmission period (PDCCH period) or a function as an input thereof;
  • Downlink control channel transmission interval (PDCCH transmission duration) or a function with it as an input;
  • PDSCH period downlink shared channel transmission period or a function that takes it as an input
  • Downlink shared channel transmission duration (PDSCH transmission duration) or a function of inputting it;
  • Upstream channel repetition information or a function that takes it as input
  • Uplink access channel transmission period PRACH period
  • PRACH period Uplink access channel transmission period
  • the uplink access channel transmission interval (PRACH transmission duration) or a function of its input.
  • the random access response window related information may include:
  • an embodiment of the present invention further provides a random access method, including the following steps:
  • the communication node acquires the random access information, where the random access information includes: a sequence number of the superframe that sends the preamble;
  • the communication node determines the RA-RNTI based on the random access information.
  • the determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA_RNTI n0+k1 ⁇ HSFN_id
  • n0 and k1 are coefficients
  • HSFN_id is the sequence number of the superframe for transmitting the preamble.
  • the determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA_RNTI n0+k1 ⁇ f(HSFN_id);
  • f() represents a function with HSFN_id as input
  • HSFN_id is a sequence number of a superframe for transmitting preamble.
  • the determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA_RNTI n0+m ⁇ f(ki,C i );
  • f() represents a function with ki, C i as input, C i is random access information, and n0, m, and ki are coefficients.
  • the random access information may include one or a combination of the following:
  • a PDCCH period of the downlink control channel or a function of the input thereof wherein the unit of the PDCCH period may be a superframe, a frame, a subframe, a second (s), a millisecond (ms), or other time units;
  • a PRACH period of the random access channel or a function of the input thereof wherein the unit of the PRACH period may be a superframe, a frame, a subframe, an s, an ms, or other time unit;
  • the unit of the Preamble period can be a PRACH period, a PDCCH period, a super frame, a frame, a subframe, s, ms or other time unit;
  • the maximum length M W_RAR of the RA response window length W_RAR where the unit of M W_RAR may be a PDCCH period, a PRACH period, a super frame, a frame, a subframe, an s, an ms, or other time units;
  • the number of repetitions of the downlink control channel, Ri, or a function of its input is the number of repetitions of the downlink control channel, Ri, or a function of its input.
  • the determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA-RNTI n0+k1 ⁇ band_id+k2 ⁇ floor(SFN_id/minPeriod)+k2 ⁇ ceil(HSFNnumber/minPeriod) ⁇ (HSFN_id mod M W_RAR );
  • n0 is the coefficient
  • minPeriod is the minimum period of random access
  • the unit of minPeriod is the frame
  • M W_RAR is the maximum length of the RA response window length W_RAR
  • the unit of M W_RAR is the super frame
  • floor() means rounding down
  • Ceil() means round up
  • the band_id is the frequency band index of the preamble
  • the SFN_id is the sequence number of the radio frame that transmits the preamble
  • the HSFNnumber is the number of radio frames included in one superframe
  • the HSFN_id is the sequence number of the superframe that transmits the preamble.
  • the determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA-RNTI n0+k1 ⁇ band_id+k2 ⁇ floor(SFN_id/minPeriod)+floor(Rmax/z) ⁇ [k2 ⁇ ceil(HSFNnumber/minPeriod) ⁇ (HSFN_id mod M W_RAR )],
  • minPeriod is the minimum period of random access
  • the unit of minPeriod is the frame
  • M W_RAR is the maximum length of the RA response window length W_RAR
  • the unit of M W_RAR is the super frame
  • floor() means rounding down
  • Ceil() means round up
  • z is a first threshold, and the value ranges from a positive integer.
  • the z value can be one of the following: 2048, 1024, 512, 256, 128, 64.
  • k1 can be 1, and k2 can be the maximum number of bands in the system (eg, 4).
  • Band_id is the frequency band index of the preamble
  • SFN_id is the sequence number of the radio frame that transmits the preamble
  • HSFNnumber is the number of radio frames included in one superframe
  • HSFN_id is the sequence number of the superframe that transmits the preamble
  • Rmax is the effective duration of the downlink control channel search space. The number of subframes.
  • the determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA-RNTI n0+k1 ⁇ band_id+k2 ⁇ [floor(Rmax/z) ⁇ (HSFN_id mod M W_RAR )]+k3 ⁇ floor(SFN_id/minPeriod),
  • n0 is a coefficient and floor() means rounding down
  • z is a first threshold, and the value ranges from a positive integer.
  • the z value can be one of the following: 2048, 1024, 512, 256, 128, 64.
  • k1 can be 1, and k2 can be the maximum number of bands in the system (eg, 4).
  • M W_RAR is the maximum length of the RA response window length W_RAR
  • the band_id is the frequency band index of the preamble
  • the SFN_id is the sequence number of the radio frame that transmits the preamble
  • Rmax is the number of valid subframes in the downlink control channel search space
  • the HSFN_id is the preamble.
  • the serial number of the superframe, minPeriod is the minimum period of random access.
  • the determining, by the communication node, the RA-RNTI according to the random access information may include: the communication node determining that the RA-RNTI is:
  • RA-RNTI n0+k1 ⁇ band_id+k2 ⁇ (HSFN_id mod M W_RAR )+k3 ⁇ M W_RAR ⁇ floor(SFN_id/minPeriod),
  • n0 is a coefficient
  • floor() means rounding down
  • ki is the maximum value after the previous one or more factors are summed
  • k1 can be 1
  • k2 can be the maximum number of bands in the system (eg: 4).
  • M W_RAR is the maximum length of the RA response window length W_RAR
  • the band_id is the frequency band index of the preamble
  • the SFN_id is the sequence number of the radio frame that transmits the preamble
  • the HSFN_id is the sequence number of the super frame that transmits the preamble
  • the minPeriod is the random access minimum period.
  • n0 has a value of one.
  • the M W_RAR may be determined according to a PDCCH period of the downlink control channel; M W — RAR is a maximum number of superframes corresponding to the PDCCH period ⁇ k, or the M W —RAR is a maximum superframe corresponding to the RAR detection window. Quantity; where k is a coefficient.
  • At least one of the following may be determined according to at least one of a valid subframe number Rmax of the downlink control channel search space, a transmission period of the downlink control channel, and a RAR window length: an RA-RNTI calculation formula, a minPeriod value.
  • determining a value of minPeriod according to at least one of Rmax, a transmission period of a downlink control channel, and a RAR window length may include:
  • minPeriod as the minimum period of PRACH, for example: 4 radio frames; or,
  • minPeriod Determine minPeriod according to the value of Rmax; for example, when Rmax is greater than x1, minPeriod is 16, 32, 64, 128, 256, 512, and when Rmax is less than or equal to x1, minPeriod is 4; or,
  • the minPeriod is determined according to the value of the transmission period of the downlink control channel; for example, when the transmission period of the downlink control channel is greater than x2, the minPeriod is 32, 64, 128, 256, 512, and the transmission period of the downlink control channel is less than or equal to x2, minPeriod Is 4; or,
  • minPeriod is determined according to the RAR window length; for example, the RAR window length is greater than x3, the minPeriod is 32, 64, 128, 256, 512, the RAR window length is less than or equal to x3, and the minPeriod is 4.
  • x1 may be 128, x2 may be 512, and x3 may be 512 radio frames.
  • determining the RA-RNTI calculation formula according to at least one of Rmax, a transmission period of the downlink control channel, and a RAR window length may include:
  • the RA-RNTI calculation formula is determined according to Rmax; for example, when Rmax is greater than x1, the RA-RNTI is determined according to the superframe, the frame, and the band_id, and when Rmax is less than or equal to x1, the RA-RNTI is determined according to the frame and the band_id;
  • the RA-RNTI determines according to the superframe, the frame, and the band_id, and the transmission period of the downlink control channel is less than or equal to x2.
  • the RA-RNTI is determined according to the frame and the band_id;
  • the RA-RNTI calculation formula is determined according to the RAR window length; for example, the RAR window length is greater than x3, the RA-RNTI is determined according to the super frame, the frame, and the band_id, and the RAR window length is less than or equal to x3, and the RA-RNTI is determined according to the frame and the band_id.
  • x1 may be 128, x2 may be 512, and x3 may be 512 radio frames.
  • an embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement any of the above random access methods.
  • computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules or other data. Sex, removable and non-removable media.
  • Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridge, magnetic tape, magnetic disk storage or other magnetic storage device, or may Any other medium used to store the desired information and that can be accessed by the computer.
  • communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media. .
  • An embodiment of the present application provides a random access method and apparatus, and by introducing a factor that reflects a difference in a starting radio frame of a preamble or a frequency domain location index information that transmits a preamble in a calculation formula of the RA-RNTI, ensuring that the terminal is When the RA response windows overlap, no additional collisions occur and the terminal consumes less power.

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Abstract

L'invention concerne un procédé et un appareil d'accès aléatoire. Le procédé d'accès aléatoire comporte les étapes suivantes: un nœud de communication acquiert des informations d'accès aléatoire; et le nœud de communication détermine un RA-RNTI d'après les informations d'accès aléatoire, les informations d'accès aléatoire comportant un numéro d'ordre d'une sous-trame servant à émettre un préambule et un numéro d'ordre d'une trame radio servant à émettre le préambule, ou les informations d'accès aléatoire comportant un indice de position en domaine temporel servant à émettre le préambule et un indice de position en domaine fréquentiel servant à émettre le préambule.
PCT/CN2017/071105 2016-01-13 2017-01-13 Procédé et appareil d'accès aléatoire Ceased WO2017121380A1 (fr)

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EP23171205.0A EP4221436A1 (fr) 2016-01-13 2017-01-13 Procédé et appareil d'accès aléatoire
ES17738193T ES2809724T3 (es) 2016-01-13 2017-01-13 Método de acceso aleatorio, nodo de comunicación y medio legible por ordenador no transitorio
US16/068,853 US10736149B2 (en) 2016-01-13 2017-01-13 Method and apparatus for random access
KR1020187023225A KR102687897B1 (ko) 2016-01-13 2017-01-13 랜덤 액세스 방법 및 장치
JP2018536228A JP6936232B2 (ja) 2016-01-13 2017-01-13 ランダムアクセス方法および装置
EP17738193.6A EP3404991B1 (fr) 2016-01-13 2017-01-13 Procédé, noeud de communication et support lisible par ordinateur non transitoire d'accès aléatoire
EP20186397.4A EP3755110B1 (fr) 2016-01-13 2017-01-13 Procédé et appareil d'accès aléatoire
US16/937,133 US11051346B2 (en) 2016-01-13 2020-07-23 Method and apparatus for random access
US17/346,047 US11818762B2 (en) 2016-01-13 2021-06-11 Method and apparatus for random access

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CN201610286416.3A CN106973441B (zh) 2016-01-13 2016-04-29 一种随机接入方法及装置
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