WO2013127279A1 - 一种随机接入方法、终端、基站及系统 - Google Patents

一种随机接入方法、终端、基站及系统 Download PDF

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Publication number
WO2013127279A1
WO2013127279A1 PCT/CN2013/070523 CN2013070523W WO2013127279A1 WO 2013127279 A1 WO2013127279 A1 WO 2013127279A1 CN 2013070523 W CN2013070523 W CN 2013070523W WO 2013127279 A1 WO2013127279 A1 WO 2013127279A1
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WIPO (PCT)
Prior art keywords
access
access sequence
terminal
sequence
round
Prior art date
Application number
PCT/CN2013/070523
Other languages
English (en)
French (fr)
Inventor
万莉
乐春晖
Original Assignee
华为技术有限公司
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.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP13755428.3A priority Critical patent/EP2804439A4/en
Priority to JP2014559066A priority patent/JP5901804B2/ja
Priority to KR20147025021A priority patent/KR20140130164A/ko
Publication of WO2013127279A1 publication Critical patent/WO2013127279A1/zh
Priority to US14/470,505 priority patent/US20150003427A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0866Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0891Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/0005Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/004Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/02Selection of wireless resources by user or terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, a terminal, and a base station for performing random access through a Physical Random Access Channel (PRACH).
  • PRACH Physical Random Access Channel
  • the Long Term Evolution (LTE) system has very good performance in low-speed scenes with terminal moving speeds from 0 to 15 km/h.
  • the terminal is 15 ⁇ 120km/h.
  • the speed still has a high performance when moving, and the terminal can remain connected when moving at a speed of 120km/h to 350km/h.
  • the maximum speed can be increased to 500km/h.
  • the embodiment of the invention provides a random access method, which can enable a terminal other than the base station 100KM to access the physical random access channel.
  • the embodiments of the present invention also provide corresponding terminals, base stations, and systems.
  • a random access method including:
  • the timing advance is adjusted according to the round-trip transmission delay, and the first message is sent to the base station by the adjusted timing advance, so that the base station demodulates the first message, and the terminal accesses the physical random access channel.
  • a random access method including:
  • the timing advance is adjusted according to the round-trip transmission delay, and the adjusted timing advance is completely compensated for the round-trip transmission delay.
  • a random access method including:
  • Timing advance adjustment command carries the determined round-trip transmission delay, so that the terminal adjusts the timing advance according to the round-trip transmission delay
  • a random access method including:
  • the indication information of the accessed physical random access channel sent to the terminal, the accessed indication letter is carried in the information, so that the terminal adjusts the timing advance according to the round-trip transmission delay, so that the adjusted timing advance fully compensates the round-trip transmission delay.
  • a terminal comprising:
  • a first acquiring unit configured to acquire an index of a first access sequence used by a cell where the terminal is located, where the first query unit is configured to perform pre-establishment according to an index of the first access sequence acquired by the first acquiring unit
  • the candidate sequence list is used to query a specified number of access sequences used by the cell in which the terminal is located; the first selecting unit is configured to select any one of the specified number of access sequences that are queried from the first query unit.
  • a first signal generating unit configured to map the first access sequence selected by the first selecting unit to a specified bandwidth according to a preset subcarrier interval, to generate a first random access signal, where the subcarrier spacing is smaller than 1.25KHZ;
  • a first sending unit configured to send a first random access signal generated by the first signal generating unit to the base station, to enable the base station to determine a round-trip transmission delay according to the first access sequence in the random access signal
  • a first receiving unit configured to receive a timing advance adjustment command sent by the base station, where the timing advance adjustment command carries the round-trip transmission delay
  • a first adjusting unit configured to adjust a timing advance amount according to a round-trip transmission delay carried in the timing advance adjustment command received by the first receiving unit
  • the first sending unit is configured to send a first message to the base station by using the timing advance adjusted by the first adjusting unit, so that the base station demodulates the first message, and connects the terminal to the physical random access channel. .
  • a terminal comprising:
  • a second receiving unit configured to receive random access indication information sent by the base station, where the random access indication information carries a specified access sequence index
  • a second selecting unit configured to select, according to the specified access sequence index received by the second receiving unit, an access sequence corresponding to the specified access sequence index from the pre-established candidate sequence list Second access sequence;
  • a second signal generating unit configured to map a second access sequence selected by the second selecting unit to a specified bandwidth according to a preset subcarrier interval, to generate a random access signal, where the subcarrier spacing is less than 1.25KHZ ;
  • a second sending unit configured to send a random access signal generated by the second signal generating unit to the base station, to enable the base station to determine a round-trip transmission delay according to the second access sequence in the random access signal;
  • the second receiving unit is further configured to receive, by the base station, indication information of the accessed physical random access channel, where the accessed indication information carries the round-trip transmission delay;
  • a second adjusting unit configured to be used according to the received indication information received by the second receiving unit
  • the carried round-trip transmission delay adjusts the timing advance amount, so that the adjusted timing advance fully compensates for the round-trip transmission delay.
  • a base station comprising:
  • a third receiving unit configured to receive a random access signal sent by the terminal
  • a second acquiring unit configured to acquire a first access sequence carried in the random access signal received by the third receiving unit
  • a first determining unit configured to determine, by using the first access sequence acquired by the second acquiring unit, a round-trip transmission delay
  • a third sending unit configured to send a timing advance adjustment command to the terminal, where the timing advance adjustment command carries the round-trip transmission delay determined by the first determining unit, so that the terminal adjusts the timing advance according to the round-trip transmission delay ;
  • the third receiving unit is further configured to receive a first message sent by the terminal;
  • a demodulation unit configured to demodulate the first message received by the third receiving unit, to enable the terminal to access the physical random access channel.
  • a base station comprising:
  • a fourth sending unit configured to send random access indication information to the terminal, where the random access indication information carries a specified access sequence index
  • a fourth receiving unit configured to receive a random access signal sent by the terminal
  • a third acquiring unit configured to acquire a second access sequence from the random access signal received by the fourth receiving unit
  • a second determining unit configured to determine, by using the second access sequence acquired by the third acquiring unit, a round-trip transmission delay
  • the fourth sending unit is further configured to send the indication information of the accessed physical random access channel to the terminal, where the accessed indication information carries the round-trip transmission delay, so that the terminal transmits according to the round-trip transmission
  • the delay adjusts the timing advance amount so that the adjusted timing advance fully compensates for the round-trip transmission delay.
  • a random access system comprising a terminal and a base station, wherein the terminal is a terminal according to the foregoing technical solution, and the base station is a base station according to the foregoing technical solution.
  • the embodiment of the present invention uses an index of the first access sequence used by the cell where the terminal is located.
  • the specified number of cells used by the terminal is queried from the pre-established candidate sequence list.
  • An access sequence selecting any one of the specified access sequences from the query as the first access sequence; mapping the first access sequence to a specified one according to a preset subcarrier spacing Generating a first random access signal, the subcarrier spacing is less than 1.25 kHz; transmitting the first random access signal to the base station, so that the base station is configured according to the random access signal
  • An access sequence determines a round-trip transmission delay; receiving a timing advance adjustment command sent by the base station, the timing advance adjustment command carries the round-trip transmission delay; adjusting a timing advance according to the round-trip transmission delay, and adjusting The subsequent timing advance sends the first message to the base station, so that the base station demodulates the first message, and accesses the terminal to the physical random access channel.
  • the random access method provided by the embodiment of the present invention has a subcarrier spacing of less than 1.25 kHz, and adjusts the timing advance according to the subcarrier spacing, so that terminals other than the base station 100 KM can be physically randomized. Access channel.
  • FIG. 1 is a schematic diagram of an embodiment of a random access method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of another embodiment of a random access method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of another embodiment of a random access method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of another embodiment of a random access method according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of an embodiment of an application scenario of the present invention.
  • FIG. 6 is a schematic diagram of another embodiment of an application scenario of the present invention.
  • FIG. 7 is a schematic diagram of an embodiment of a terminal in an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of another embodiment of a terminal in an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of another embodiment of a terminal in an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of another embodiment of a terminal according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of another embodiment of a terminal in an embodiment of the present invention.
  • FIG. 12 is a schematic diagram of another embodiment of a terminal according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of an embodiment of a base station according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of another embodiment of a base station according to an embodiment of the present invention.
  • FIG. 15 is a schematic diagram of another embodiment of a base station according to an embodiment of the present invention.
  • FIG. 16 is a schematic diagram of an embodiment of a system according to an embodiment of the present invention.
  • an embodiment of a random access method includes:
  • the physical access random access channel includes the contention mode access and the non-contention mode access.
  • the embodiment of the present invention focuses on the random access process of the contention mode.
  • the number of access sequences used by the terminals in each cell is predetermined. For example, 64 access sequences are commonly used as candidate sequences for random access, and the base station will use 64 of each cell.
  • the first access sequence index of the access sequence is sent to each cell, and the terminal of the cell can determine the next 63 access sequence indexes according to the first access sequence index, and each index corresponds to one access. Sequence, thereby determining these 64 access sequences. For example, the index of the first access sequence sent by the base station to the cell is x, then x ⁇ x+63 corresponds to 64 access sequences.
  • the terminal In the contention mode, the terminal needs to access the PRACH, and selects any access sequence (Preamble sequence;) when the random access signal is generated.
  • the access sequence is a ZC Zadoff-Chu sequence.
  • TA Timing Advance
  • ⁇ ⁇ ⁇ is less than or equal to
  • the carrier spacing in the prior art is 1.25 ⁇ , in order to ensure that the terminal other than 100KM can also access the base station smoothly, especially the terminal of the ultra-long distance can also access the PRACH smoothly, for example, the terminal of the 200KM can also be connected.
  • the TA needs to be extended.
  • the TA has 11 bits, and the TA can be extended to 12 bits, so that the value range of the TA can be 0 to 4097.
  • the factor carrier spacing becomes smaller, and the bandwidth occupied by the access sequence does not change. Therefore, the length of the access sequence needs to be changed.
  • the relationship between the subcarrier spacing, the length of the access sequence, and the specified bandwidth can be expressed as : ⁇ * RA ⁇ specified bandwidth, where the specified bandwidth is the reciprocal of the timing precision, such as:
  • is the access sequence Length
  • ⁇ ⁇ is the subcarrier spacing; in order to ensure the maximum number of access sequences, take the prime number, so the total number of available access sequences is! ⁇ !-1.
  • the access sequence table is first established. The access sequence is determined by the length of the access sequence and the index of the access sequence. If you want to guarantee the available access sequence. The number is the largest, then ⁇ is best to take the prime number. If 1601 is used, then there are 1600 available access sequences, then there are 1600 access sequences in the sequence list to be selected.
  • the access sequence is suitable as the candidate access sequence. In the low frequency partial scenario, only the length of the access sequence and the access sequence of the access sequence are selected as the candidate access sequence, and the access sequence is established.
  • the process of establishing the sequence of the candidate sequence is to calculate the length of the access sequence according to the preset subcarrier spacing and the specified bandwidth; determining the access sequence index according to the length of the access sequence And the range of the access sequence and the access sequence of the access sequence are selected as the to-be-selected access sequence, and the to-be-selected sequence table is established.
  • the access sequence not only needs to meet the above-mentioned mutual quality condition, but also satisfies the specified shift value d u is smaller than the preset threshold; wherein the specified shift value d u refers to when the frequency offset is 1/T SE Q
  • T SEQ is the time domain length of the access sequence, in fact T SEQ is the reciprocal of the subcarrier spacing.
  • the error of the RTD estimation can reach [-N*d u , N*d u ], converted to absolute time [- ( N ⁇ du ) I ( Af ⁇ ⁇ L ⁇ , ( N ⁇ du ) I ( 4 ⁇ * 63 ⁇ 4 ) ], the unit is seconds, N is quantized
  • the range of d u can be set according to the tolerance of the system to the RTD error, thereby determining the number of available access sequences, and the preset threshold mentioned in the embodiment of the present invention is actually in the d u
  • the value of d u satisfies the maximum error tolerance of the RTD.
  • u is called the physical root sequence number, where N zc Is the total number of samples of the ZC sequence produced.
  • d u refers to the shift of the mirror peak of the receiver output to the round-trip delay when the frequency offset is 1 / T SE Q
  • N After zc is a fixed value, according to formula 3 and formula 4, d u is determined by u value, and p is also determined by u value, so the d u value of each physical root sequence number u can be regarded as the sequence itself. Characteristics.
  • the process of establishing a sequence to be selected may be expressed as follows: According to the preset subcarrier spacing and the specified bandwidth, the length of the access sequence is calculated.
  • the terminal Maps the first access sequence to a specified bandwidth according to a preset subcarrier interval, and generate a first random access signal, where the subcarrier spacing is less than 1.25 kHz.
  • the terminal initiates random access, it is required to select any one of the access sequence selected from the foregoing two schemes, and map the selected access sequence to the specified bandwidth according to the preset subcarrier spacing.
  • Generating a random access signal, the subcarrier spacing being less than 1.25 kHz. That is to say, when the terminal is in the low frequency partial scene, only one access sequence needs to be selected from the candidate sequence table that satisfies the length of the access index and the length of the access sequence, according to the preset carrier spacing.
  • the terminal if the terminal is in a high frequency partial scenario, the terminal preferably satisfies both the access sequence index and The length of the access sequence is relatively good, and the random access signal is generated by selecting any one of the access sequences in the candidate sequence list whose d u is less than the preset threshold, and the random access process is initiated, so as to avoid excessively large
  • the frequency shift affects the judgment of the RTD.
  • the terminal sends the random access signal generated in step 103 to the base station, and after receiving the random access signal, the base station acquires the first access sequence carried in the random access signal, and determines a specified number of connections used by the cell where the terminal is located. After the sequence is entered, each of the determined specified number of access sequences is associated with the first access sequence, and the round-trip transmission delay is determined according to the maximum peak position after correlation; or Determining, by using a predetermined number of access sequences used by the cell in which the terminal is located, and using each of the determined specified number of access sequences to be associated with the first access sequence, respectively, according to the related first path The position of the peak determines the round-trip transmission delay.
  • the first path is that one signal sent by the terminal becomes multipath in the transmission process, and the first signal that arrives at the base station is called the first path.
  • Timing advance adjustment command sent by the base station, where the timing advance adjustment command carries a round-trip transmission delay determined by the base station.
  • the base station After determining the round-trip transmission delay, the base station will adjust the timing advance according to the round-trip transmission delay. For example, when the round-trip transmission delay is 1334us, the TA is adjusted to 2564.
  • the base station After receiving the first message, the base station demodulates the first message, carries the terminal identifier carried in the first message in the second message, sends the second message to the terminal, and the terminal receives the second message. After the message, the terminal identifier that is carried in the second message is identified.
  • the terminal confirms that the terminal identifier in the second message is its own terminal identifier, the terminal sends an access response message to the base station, so that the base station confirms that the terminal has been connected.
  • the physical random access channel is entered.
  • the base station may receive the first message sent by several terminals at the same time. Since the base station can only demodulate the first message of one terminal, the base station carries the identifier of the terminal in the second message after demodulation, so that the base station can The terminal confirms the information sent to itself.
  • the frequency offset range can be
  • the frequency offset range is a result of the combined effect of the crystal oscillator deviation between the base station and the UE, the carrier frequency of the system, the moving speed and direction of the UE, etc., and the embodiment of the present invention uses the subcarrier spacing of the physical random access channel.
  • N is the order of quantization.
  • the index of the first access sequence used by the cell where the terminal is located is obtained.
  • the rule for using the cell where the terminal is located is queried from the pre-established candidate sequence list.
  • the number of access sequences selecting any one of the specified access sequences from the query as the first access sequence; mapping the first access sequence to the specified according to preset subcarrier intervals Generating a first random access signal, the subcarrier spacing is less than 1.25 kHz; sending the first random access signal to a base station, so that the base station is configured according to the first access in the random access signal
  • the sequence determines a round-trip transmission delay; receiving a timing advance adjustment command sent by the base station, where the timing advance adjustment command carries the round-trip transmission delay; adjusting a timing advance according to the round-trip transmission delay, and adjusting the timing Sending the first message to the base station in advance, causing the base station to demodulate the first message, and accessing the terminal to the physical random access channel.
  • the random access method provided by the embodiment of the present invention has a subcarrier spacing of less than 1.25 kHz, and adjusts the timing advance according to the subcarrier spacing, so that terminals other than the base station 100 KM can be physically randomized. Access channel.
  • an embodiment of the random access method provided by the embodiment of the present invention includes:
  • the embodiment of the present invention focuses on a random access procedure in a non-contention mode.
  • the random access in the non-contention mode refers to a random access procedure performed by the terminal according to the indication of the base station.
  • the base station side and the terminal side are preset with the same access sequence list.
  • the random access indication information carries the specified access sequence index.
  • the carrier interval maps the second access sequence to a specified bandwidth to generate a random access signal, and the subcarrier spacing is less than 1.25 kHz.
  • the terminal After receiving the random access indication information, the terminal according to the specified access sequence index, from the pre- The second access sequence is selected in the selected sequence of the selected sequence.
  • the embodiment of the present invention provides two establishment schemes, one is: according to the preset subcarrier spacing and the The specified bandwidth, the length of the access sequence is calculated.
  • Sequence list the candidate sequence list established by the scheme is applicable to the low frequency partial scene, and the access sequence corresponding to the specified access sequence index is the root sequence index and the length of the access sequence to be selected is relatively prime
  • the access sequence the terminal selects an access sequence corresponding to the specified access sequence index from the candidate sequence list as the second access sequence.
  • the other one is: calculating a length of the access sequence according to the preset subcarrier spacing and the specified bandwidth; determining a range of the access sequence index according to the length of the access sequence, and selecting the access sequence
  • the length of the access sequence and the index of the access sequence are relatively prime, and the access sequence whose specified shift value du is less than the preset threshold is used as the candidate access sequence to establish the candidate sequence list;
  • the sequence table is applicable to the high frequency partial scene.
  • the second access sequence is mapped to the specified bandwidth according to the preset subcarrier spacing, and a random access signal is generated, and the subcarrier spacing adjustment scheme provided by the embodiment of the present invention is provided.
  • step 104 This step is the same as step 104 above, and will not be described here.
  • the non-contention access is performed, and the base station side already knows the sequence used when the terminal sends the random access signal. Therefore, after receiving the random access signal, the base station can allow the terminal to receive the PRACH.
  • This step is the same as step 106 above, and will not be described here.
  • the receiving the random access indication information sent by the base station where the random access indication information carries the specified access sequence index; according to the specified access sequence index, from the pre-established candidate sequence list Selecting an access sequence corresponding to the specified access sequence index as a second access sequence, and mapping the second access sequence to a specified bandwidth according to a preset subcarrier interval.
  • the subcarrier spacing is less than 1.25 kHz; transmitting the random access signal to the base station, so that the base station determines a round-trip transmission delay according to the second access sequence in the random access signal; The indication information of the accessed physical random access channel sent by the base station, where the accessed indication information carries the round-trip transmission delay; adjusting the timing advance according to the round-trip transmission delay, so that the adjusted The timing advance fully compensates for the round trip transmission delay.
  • the random access method provided by the embodiment of the present invention can satisfy a long-distance, high-speed terminal accessing a physical random access channel.
  • another embodiment of the random access method provided by the embodiment of the present invention includes:
  • the base station After receiving the random access signal sent by the terminal, the base station acquires the first access sequence from the random access signal.
  • One is: determining a specified number of access sequences used by the cell where the terminal is located, and using each of the determined specified number of access sequences to be associated with the first access sequence respectively, according to the correlation
  • the maximum peak position determines the round trip transmission delay.
  • the other is: determining a specified number of access sequences used by the cell where the terminal is located, and performing, by using each of the determined specified number of access sequences, the first access sequence, respectively, according to the correlation.
  • the position of the subsequent first-path peak determines the round-trip transmission delay.
  • the candidate sequence list in the base station is the same as the candidate sequence table in the terminal.
  • the base station After determining the round-trip transmission delay, the base station sends a timing advance adjustment command to the terminal, and the determined round-trip transmission delay is carried in the timing advance adjustment command, so that the terminal adjusts the timing advance according to the round-trip transmission delay, such as When the round-trip transmission delay is 1334us, the TA is adjusted to 2564.
  • the range of the frequency offset may be first obtained, and the range of the frequency offset is binned; and within the frequency offset range after the binning, respectively demodulating the first Message. If there is a large frequency offset, the base station side will not be correctly demodulated.
  • the frequency offset range [- ⁇ ⁇ AJ can be binned. It is recommended to demodulate the first message every time interval.
  • the frequency offset range is determined by the base station and
  • the embodiment of the present invention quantizes the subcarrier spacing of the physical random access channel, and N is the order of quantization. .
  • the base station After acquiring the terminal identifier from the first message, the base station sends a second message to the terminal, and carries the terminal identifier in the second message, so that the terminal confirms that the information is sent to the terminal. After the terminal identifies the terminal identifier from the second message, the terminal sends an access response message to the base station, and the base station receives the access response message sent by the terminal to confirm that the terminal accesses the physical random access channel.
  • the receiving the random access signal sent by the terminal and acquiring the first access sequence carried from the random access signal; determining the round-trip transmission delay by using the first access sequence; sending the terminal to the terminal a timing advance adjustment command, the timing advance adjustment command carries the determined round-trip transmission delay, so that the terminal adjusts the timing advance according to the round-trip transmission delay; receives the first message sent by the terminal, and performs the first message A message is demodulated to enable the terminal to access the physical random access channel.
  • the random access method provided by the embodiment of the present invention can enable a long-distance, high-speed terminal to access the PRACH.
  • another embodiment of the random access method provided by the embodiment of the present invention includes:
  • the base station when the base station transmits the random access indication information, the base station specifies the random access sequence of the terminal.
  • the base station side receives the random access signal of the terminal, and the base station determines, according to the first access sequence index of the cell where the terminal is located, a specified number of access sequences used by the cell where the terminal is located, and uses the determined specified number of access sequences.
  • Each of the access sequences is associated with the second access sequence, and the round-trip transmission delay is determined according to the maximum peak position after the correlation, or the terminal is determined according to the first access sequence index of the cell where the terminal is located.
  • a predetermined number of access sequences used by the cell, and each of the determined access sequences of the determined number of access sequences is associated with the second access sequence, respectively, according to the location of the related first-path peak The round trip transmission delay is determined.
  • the indication information of the accessed physical random access channel sent to the terminal where the accessed indication information carries the round-trip transmission delay, so that the terminal adjusts the timing advance according to the round-trip transmission delay, so that The adjusted timing advance fully compensates for the round trip transmission delay.
  • the non-contention access is performed, and the base station side already knows the sequence used by the terminal to send the random access signal. Therefore, after receiving the random access signal, the base station can allow the terminal to receive the PRACH.
  • the random access indication information is sent to the terminal, where the random access indication information carries the second access sequence; the random access signal sent by the terminal is received, and the random access signal is obtained from the random access signal. a second access sequence; determining, by the second access sequence, a round-trip transmission delay; indication information of the accessed physical random access channel sent to the terminal, where the accessed indication information carries the round-trip transmission And delaying, adjusting, by the terminal, the timing advance according to the round-trip transmission delay, so that the adjusted timing advance fully compensates the round-trip transmission delay.
  • the random access method provided by the embodiment of the present invention can enable a long-distance, high-speed terminal to access the PRACH.
  • the terminal acquires a first access sequence index sent by the base station, and queries, according to the first access sequence index, a specified number of access sequences used by the cell where the terminal is located, from the pre-established candidate sequence list, Selecting any one of the specified number of access sequences as the first access sequence, and mapping the first access sequence to a specified bandwidth according to a preset subcarrier interval, generating a random The access signal, the subcarrier spacing is less than 1.25 kHz.
  • the terminal sends the random access signal to the base station.
  • the base station determines a round-trip transmission delay according to the first access sequence in the random access signal.
  • the base station sends a timing advance adjustment command, where the timing advance adjustment command carries a round-trip transmission delay determined by the base station.
  • the terminal adjusts the timing advance according to the round-trip transmission delay, so that the adjusted timing advance amount completely compensates the round-trip transmission delay.
  • the terminal sends the first message to the base station by using the adjusted timing advance.
  • the base station sends a second message to the terminal, where the terminal identifier is carried in the second message.
  • the terminal identifies the terminal identifier that is carried in the second message.
  • the terminal sends an access response message to the base station, so that the base station confirms that the terminal has accessed the physical random access. channel.
  • the base station sends random access indication information, where the random access indication information carries a specified access sequence index.
  • the terminal selects, according to the specified access sequence index, an access sequence corresponding to the specified access sequence index from the pre-established candidate sequence list as the second access sequence, and according to preset
  • the subcarrier spacing maps the specified access sequence to a specified bandwidth to generate a random access signal, and the subcarrier spacing is less than 1.25 kHz.
  • the base station determines a round-trip transmission delay according to the access sequence in the random access signal.
  • B5. The indication information that the base station sends the access to the physical random access channel to the terminal, where the accessed indication information carries the round-trip transmission delay, so that the terminal adjusts the timing advance according to the round-trip transmission delay.
  • the adjusted timing advance is fully compensated for the round trip transmission delay.
  • an embodiment of a terminal provided by an embodiment of the present invention includes:
  • the first obtaining unit 501 is configured to obtain an index of the first access sequence used by the cell where the terminal is located, where the first query unit 502 is configured to use, according to the index of the first access sequence acquired by the first acquiring unit 501, Querying, from the pre-established candidate sequence list, a specified number of access sequences used by the cell where the terminal is located;
  • a first selecting unit 503 configured to select any one of the specified access sequences that are queried by the first query unit 502 as the first access sequence
  • the first signal generating unit 504 is configured to map the first access sequence selected by the first selecting unit 503 to a specified bandwidth according to a preset subcarrier interval, to generate a first random access signal, where the subcarrier The interval is less than 1.25KHZ;
  • the first sending unit 505 is configured to send the first random access signal generated by the first signal generating unit 504 to the base station, so that the base station determines the round-trip transmission according to the first access sequence in the random access signal. Delay
  • the first receiving unit 506 is configured to receive a timing advance adjustment command sent by the base station, where the timing advance adjustment command carries the round-trip transmission delay;
  • the first adjusting unit 507 is configured to adjust a timing advance amount according to a round-trip transmission delay carried in the timing advance adjustment command received by the first receiving unit 506;
  • the first sending unit 505 is configured to send, by using the timing advance amount adjusted by the first adjusting unit 507, a first message to the base station, to enable the base station to demodulate the first message, and connect the terminal to the physical random connection. Into the channel.
  • the first acquiring unit 501 acquires an index of the first access sequence used by the cell where the terminal is located; the first query unit 502 is configured according to the index of the first access sequence acquired by the first acquiring unit 501. Querying, from the pre-established candidate sequence list, a specified number of access sequences used by the cell where the terminal is located; the first selecting unit 503 selects any one of the specified number of access sequences that is queried by the first query unit 502.
  • the incoming sequence is used as the first access sequence; the first signal generating unit 504 follows the preset The subcarrier spacing maps the first access sequence selected by the first selecting unit 503 to a specified bandwidth to generate a first random access signal, where the subcarrier spacing is less than 1.25 kHz; the first sending unit 505 sends the The first random access signal generated by the first signal generating unit 504 is sent to the base station, so that the base station determines the round-trip transmission delay according to the first access sequence in the random access signal; the first receiving unit 506 receives the sending by the base station.
  • the timing advance adjustment command carries the round-trip transmission delay;
  • the first adjustment unit 507 adjusts the round-trip transmission delay carried in the timing advance adjustment command received by the first receiving unit 506 a timing advance;
  • the first sending unit 505 sends a first message to the base station by using the timing advance adjusted by the first adjusting unit 507, so that the base station demodulates the first message, and connects the terminal to the physical random Access channel.
  • the terminal provided by the embodiment of the present invention can also access the PRACH when moving at a long distance and at a high speed.
  • another embodiment of the terminal provided by the embodiment of the present invention further includes:
  • a first calculating unit 508, configured to calculate a length of the access sequence according to the preset subcarrier spacing and the specified bandwidth
  • the first selecting unit 503 is further configured to determine a range of an access sequence index according to a length of the access sequence calculated by the first calculating unit 508, and select a length of the access sequence and the access sequence.
  • the access sequence that is indexed as the candidate access sequence is used to establish the candidate sequence list.
  • another embodiment of the terminal provided by the embodiment of the present invention further includes:
  • a second calculating unit 509 configured to calculate a length of the access sequence according to the preset subcarrier spacing and the specified bandwidth
  • the first selecting unit 503 is further configured to determine a range of an access sequence index according to a length of the access sequence calculated by the second calculating unit 509, and select a length of the access sequence and the access sequence.
  • the sequence of the candidate sequence is established, and the access sequence whose shift value du is less than the preset threshold is used as the candidate access sequence to establish the candidate sequence list.
  • another embodiment of the terminal provided by the embodiment of the present invention includes:
  • the second receiving unit 511 is configured to receive the random access indication information that is sent by the base station, where the random access indication information carries the specified access sequence index.
  • the second selecting unit 512 selects, according to the specified access sequence index received by the second receiving unit 511, an access sequence corresponding to the specified access sequence index from the pre-established candidate sequence list. Second access sequence;
  • the second signal generating unit 513 is configured to map the second access sequence selected by the second selecting unit 512 to a specified bandwidth according to a preset subcarrier interval, to generate a random access signal, where the subcarrier The interval is less than 1.25KHZ;
  • the second sending unit 514 is configured to send the random access signal generated by the second signal generating unit 513 to the base station, so that the base station determines the round-trip transmission delay according to the second access sequence in the random access signal;
  • the second receiving unit 511 is further configured to receive, by the base station, indication information of the accessed physical random access channel, where the accessed indication information carries the round-trip transmission delay;
  • the second adjusting unit 515 is configured to adjust the timing advance amount according to the round-trip transmission delay carried in the accessed indication information received by the second receiving unit 511, so that the adjusted timing advance amount completely compensates the Round trip transmission delay.
  • the second receiving unit 511 receives the random access indication information that is sent by the base station, where the random access indication information carries the specified access sequence index.
  • the second selecting unit 512 is configured according to the second receiving unit 511. Receiving the specified access sequence index, selecting an access sequence corresponding to the specified access sequence index from the pre-established candidate sequence list as the second access sequence; the second signal generating unit 513 The second carrier sequence selected by the second selecting unit 512 is mapped to the specified bandwidth to generate a random access signal, and the subcarrier spacing is less than 1.25 kHz; the second sending unit 514 sends the The second signal generating unit 513 generates a random access signal to the base station, so that the base station determines a round-trip transmission delay according to the second access sequence in the random access signal; and the second receiving unit 511 receives the sending by the base station.
  • the indication information of the physical random access channel is accessed, and the received indication information carries the round-trip transmission delay; the second adjustment unit 5 And adjusting the timing advance amount according to the round-trip transmission delay carried in the received indication information received by the second receiving unit 511, so that the adjusted timing advance amount completely compensates the round-trip transmission delay.
  • the terminal provided by the embodiment of the present invention can also access the PRACH when moving at a long distance and at a high speed.
  • another embodiment of the terminal provided by the embodiment of the present invention further includes:
  • a third calculating unit 516 configured to calculate a length of the access sequence according to the preset subcarrier spacing and the specified bandwidth
  • the second selecting unit 512 is further configured to determine a range of an access sequence index according to a length of the access sequence calculated by the third calculating unit 516, and select a length of the access sequence and the access sequence.
  • the access sequence that is indexed as the candidate access sequence is used to establish the candidate sequence list.
  • another embodiment of the terminal provided by the embodiment of the present invention further includes:
  • a fourth calculating unit 517 configured to calculate a length of the access sequence according to the preset subcarrier spacing and the specified bandwidth;
  • the second selecting unit 512 is further configured to determine a range of the access sequence index according to the length of the access sequence calculated by the fourth calculating unit, and select a length of the access sequence and an index of the access sequence.
  • the sequence of the candidate sequence is established, and the access sequence whose shift value du is less than the preset threshold is used as the candidate access sequence.
  • an embodiment of a base station provided by an embodiment of the present invention includes:
  • a third receiving unit 601 configured to receive a random access signal sent by the terminal
  • the second obtaining unit 602 is configured to obtain a first access sequence carried in the random access signal received by the third receiving unit 601.
  • the first determining unit 603 is configured to determine a round-trip transmission delay by using the first access sequence acquired by the second acquiring unit 602.
  • the third sending unit 604 is configured to send a timing advance adjustment command to the terminal, where the timing advance adjustment command carries the round-trip transmission delay determined by the first determining unit 603;
  • the third receiving unit 601 is further configured to receive a first message sent by the terminal;
  • the demodulation unit 605 is configured to demodulate the first message received by the third receiving unit 601, and obtain the terminal identifier from the first message.
  • the third sending unit 604 is further configured to send a second message to the terminal, and carry the terminal identifier acquired by the demodulation unit 605 in the second message;
  • the third receiving unit 601 is further configured to receive an access response message sent by the terminal, to confirm that the terminal accesses the physical random access channel.
  • the third receiving unit 601 receives the random access signal sent by the terminal, and the second acquiring unit 602 obtains the first access sequence that is carried by the random access signal received by the third receiving unit 601.
  • a determining unit 603 determines a round-trip transmission delay by using the first access sequence acquired by the second obtaining unit 602.
  • the third sending unit 604 sends a timing advance adjustment command to the terminal, where the timing advance adjustment command carries the a determining unit 603 determines a round-trip transmission delay; the third receiving unit 601 receives the first message sent by the terminal; the demodulating unit 605 demodulates the first message received by the third receiving unit 601, Acquiring the terminal identifier in the first message; the third sending unit 604 sends a second message to the terminal, and carries the terminal identifier acquired by the demodulation unit 604 in the second message; The receiving unit 601 receives an access response message sent by the terminal to confirm that the terminal accesses the physical random access channel.
  • the base station provided by the embodiment of the invention can ensure the terminal moving at a long distance and at a high speed, and can also access the PRACH.
  • the first determining unit 603 is specifically configured to determine, according to a first access sequence index of a cell where the terminal is located, a specified number of access sequences used by the cell where the terminal is located, and use the determined specified quantity. Each access sequence in the access sequence is associated with the first access sequence, and the round-trip transmission delay is determined according to the maximum peak position after correlation.
  • the first determining unit 603 is specifically configured to determine, according to the first access sequence index of the cell where the terminal is located, a specified number of access sequences used by the cell where the terminal is located, and use the determined specified number of access sequences. Each access sequence is associated with the first access sequence, and the round-trip transmission delay is determined according to the location of the associated first-path peak.
  • the demodulation unit 605 includes: an obtaining module 6051, configured to acquire a range of frequency offsets;
  • the binning module 6052 is configured to perform a binning on the range of the frequency offset acquired by the acquiring module 6051.
  • the demodulation module 6053 is configured to respectively solve the frequency offset range after the binning module 6052 is binned. Adjust the first message.
  • another embodiment of a base station provided by an embodiment of the present invention includes:
  • the fourth sending unit 611 is configured to send the random access indication information to the terminal, where the random access indication information carries the specified access sequence index;
  • the fourth receiving unit 612 is configured to receive a random access signal sent by the terminal.
  • a third obtaining unit 613 configured to acquire a second access sequence from the random access signals received by the fourth receiving unit 612;
  • a second determining unit 614 configured to determine, by using the second access sequence acquired by the third acquiring unit, a return transmission delay
  • the fourth sending unit 611 is further configured to send the indication information of the accessed physical random access channel to the terminal, where the accessed indication information carries the round-trip transmission delay, so that the terminal according to the round-trip
  • the transmission delay adjusts the timing advance amount so that the adjusted timing advance fully compensates for the round-trip transmission delay.
  • the fourth sending unit 611 sends the random access indication information to the terminal, where the random access indication information carries the specified access sequence index; the fourth receiving unit 612 receives the random access signal sent by the terminal; The third obtaining unit 613 obtains a second access sequence from the random access signal received by the fourth receiving unit 612. The second determining unit 614 determines the round-trip by using the second access sequence acquired by the third acquiring unit. a transmission delay; the fourth transmitting unit 611 sends the indication information of the accessed physical random access channel to the terminal, and the accessed indication information carries the round-trip transmission delay, so that the terminal according to the round-trip The transmission delay adjusts the timing advance amount so that the adjusted timing advance fully compensates for the round-trip transmission delay.
  • the base station provided by the embodiment of the invention can ensure the terminal moving at a long distance and at a high speed, and can also access the PRACH.
  • the second determining unit 614 is specifically configured to determine, according to the first access sequence index of the cell where the terminal is located, a specified number of access sequences used by the cell where the terminal is located, and use the determined specified number of access sequences. Each access sequence is associated with the second access sequence, and the round-trip transmission delay is determined according to the maximum peak position after correlation.
  • the second determining unit 614 is specifically configured to determine, according to the first access sequence index of the cell where the terminal is located, a specified number of access sequences used by the cell where the terminal is located, and use the determined specified number of access sequences. Each access sequence is associated with the second access sequence, and the round-trip transmission delay is determined according to the location of the associated first-path peak.
  • an embodiment of a random access system includes: a terminal 50 and a base station 60;
  • the terminal 50 is configured to obtain a first access sequence index sent by the base station, and query, according to the first access sequence index, a specified number of connections used by the cell where the terminal is located, from the pre-established candidate sequence list. In the sequence, selecting any one of the specified access sequences from the query as the first access sequence, and mapping the first access sequence to the specified bandwidth according to the preset subcarrier spacing.
  • the base station 60 is configured to receive a random access signal sent by the terminal, and obtain an access sequence index that is carried by the random access signal, and determine a round-trip transmission delay by using the carried first access sequence;
  • the terminal sends a timing advance adjustment command, where the timing advance adjustment command carries the determined round-trip transmission delay; receiving a first message sent by the terminal, and demodulating the first message, from the first message Obtaining the terminal identifier, sending a second message to the terminal, and carrying the terminal identifier in the second message; receiving an access response message sent by the terminal, to confirm that the terminal accesses the physical random access channel .
  • the terminal 50 is configured to receive the random access indication information sent by the base station, where the random access indication information carries a specified access sequence index; according to the specified access sequence index, from the pre-established The access sequence corresponding to the specified access sequence index is selected as the second access sequence in the candidate sequence table, and the second access sequence is mapped to the specified bandwidth according to the preset subcarrier spacing.
  • the base station 60 is configured to send random access indication information to the terminal, where the random access indication information carries a specified access sequence index, and receives a random access signal sent by the terminal, and from the random access signal. Acquiring a second access sequence; determining, by the second access sequence, a round-trip transmission delay; indicating information of the accessed physical random access channel sent to the terminal, where the accessed indication information carries the round-trip.
  • the transmission delay is such that the terminal adjusts the timing advance according to the round-trip transmission delay, so that the adjusted timing advance fully compensates the round-trip transmission delay.
  • the program can be stored in a computer readable storage medium.
  • the storage medium can include: ROM, RAM, disk or CD, etc.

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Abstract

本发明公开了一种随机接入方法,将从终端所在小区使用的规定数量的接入序列从选取任意一个接入序列作为第一接入序列,按照预置的子载波间隔第一接入序列映射在指定的带宽上,生成第一随机接入信号,所述子载波间隔小于1.25KHZ;发送所述随机接入信号给基站,使基站根据所述随机接入信号中的所述第一接入序列确定往返传输时延;接收基站发送的定时提前量调整命令,所述定时提前量调整命令携带所述往返传输时延;根据所述往返传输时延调整定时提前量,并以调整后的定时提前量发送第一消息给基站,使基站解调所述第一消息,将所述终端接入物理随机接入信道。本发明实施例可以保证超远距离的终端接入物理随机接入信道。

Description

一种随机接入方法、 终端、 基站及系统 本申请要求于 2012 年 2 月 29 日提交中 国专利局、 申请号为 201210050046.5、 发明名称为"一种随机接入方法、 终端、 基站及系统"的中国专 利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域, 具体涉及一种通过物理随机接入信道(PRACH, Physical Random Access Channel) 进行随机接入的方法、 终端及基站。
背景技术
按照现有的协议标准 (TS25.913-900 ) , 长期演进 (LTE, Long Terms Evolution) 系统在终端移动速度从 0到 15km/h的低速场景具有非常好的性能, 终端以 15~120km/h的速度移动时仍具有较高性能, 终端以 120km/h到 350km/h 的速度移动时仍能保持连接, 在依赖于频段时, 最高速度可以提高到 500km/h。
随着通信技术的发展, 用户对通信需求的要求越来越高, 运营商对于飞行 模式下的 LTE信号覆盖提出了需求, 飞行模式下, 终端的移动速度更高, 可以 达到 800~1200km/h, 因终端的移动速度高, 因此在相同载频下, 接入信号的多 普勒频移更大; 同时为了降低建站成本, 现有技术中 LTE 系统的基站只能支持 100KM半径的小区覆盖是远远不够的。
发明内容
本发明实施例提供一种随机接入方法, 可以使距离基站 100KM以外的终端 接入物理随机接入信道。 本发明实施例还提供了相应的终端、 基站及系统。
一种随机接入方法, 包括:
获取终端所在小区使用的第一个接入序列的索引;
根据所述第一个接入序列的索引, 从预建立的待选序列表中查询出终端所 在小区使用的规定数量的接入序列, 从所述查询出的规定数量的接入序列中选 取任意一个接入序列作为第一接入序列;
按照预置的子载波间隔将所述第一接入序列映射在指定的带宽上, 生成第 一随机接入信号, 所述子载波间隔小于 1.25KHZ; 发送所述随机接入信号给基站, 使基站根据所述随机接入信号中的所述第 一接入序列确定往返传输时延;
接收基站发送的定时提前量调整命令, 所述定时提前量调整命令携带所述 往返传输时延;
根据所述往返传输时延调整定时提前量, 并以调整后的定时提前量发送第 一消息给基站, 使基站解调所述第一消息, 将所述终端接入物理随机接入信道。
一种随机接入方法, 包括:
接收基站发送的随机接入指示信息, 所述随机接入指示信息中携带指定的 接入序列索引;
根据所述指定的接入序列索引, 从预建立的待选序列表中选取与所述的指 定的接入序列索引对应的接入序列作为第二接入序列, 并按照预置的子载波间 隔将所述第二接入序列映射在指定的带宽上, 生成随机接入信号, 所述子载波 间隔小于 1.25KHZ;
发送所述随机接入信号给基站, 使基站根据所述随机接入信号中的所述第 二接入序列确定往返传输时延;
接收基站发送的已接入物理随机接入信道的指示信息, 所述已接入的指示 信息中携带所述往返传输时延;
根据所述往返传输时延调整定时提前量, 使所述调整后的定时提前量完全 补偿所述往返传输时延。
一种随机接入方法, 包括:
接收终端发送的随机接入信号, 并从所述随机接入信号中获取携带的第一 接入序列;
通过所述第一接入序列确定往返传输时延;
向终端发送定时提前量调整命令, 所述定时提前量调整命令携带所述确定 的往返传输时延, 使终端根据所述往返传输时延调整定时提前量;
接收终端发送的第一消息, 并对所述第一消息进行解调, 使所述终端接入 所述物理随机接入信道。
一种随机接入方法, 包括:
向终端发送随机接入指示信息, 所述随机接入指示信息中携带指定的接入 序列索引;
接收终端发送的随机接入信号, 并从所述随机接入信号中获取第二接入序 列;
通过所述第二接入序列确定往返传输时延;
向终端发送的已接入物理随机接入信道的指示信息, 所述已接入的指示信 息中携带所述往返传输时延, 使终端根据所述往返传输时延调整定时提前量, 使所述调整后的定时提前量完全补偿所述往返传输时延。
一种终端, 包括:
第一获取单元, 用于获取终端所在小区使用的第一个接入序列的索引; 第一查询单元, 用于根据所述第一获取单元获取的第一个接入序列的索 引, 从预建立的待选序列表中查询出终端所在小区使用的规定数量的接入序列; 第一选取单元, 用于从所述第一查询单元查询出的规定数量的接入序列中 选取任意一个接入序列作为第一接入序列;
第一信号生成单元, 用于按照预置的子载波间隔将所述第一选取单元选取 的第一接入序列映射在指定的带宽上, 生成第一随机接入信号, 所述子载波间 隔小于 1.25KHZ;
第一发送单元, 用于发送所述第一信号生成单元生成的第一随机接入信号 给基站, 使基站根据所述随机接入信号中的所述第一接入序列确定往返传输时 延;
第一接收单元, 用于接收基站发送的定时提前量调整命令, 所述定时提前 量调整命令携带所述往返传输时延;
第一调整单元, 用于根据所述第一接收单元接收到的定时提前量调整命令 中携带的往返传输时延调整定时提前量;
所述第一发送单元, 用于以所述第一调整单元调整后的定时提前量发送第 一消息给基站, 使基站解调所述第一消息, 将所述终端接入物理随机接入信道。
一种终端, 包括:
第二接收单元, 用于接收基站发送的随机接入指示信息, 所述随机接入指 示信息中携带指定的接入序列索引;
第二选取单元, 用于根据所述第二接收单元接收到的指定的接入序列索 引, 从预建立的待选序列表中选取与所述的指定的接入序列索引对应的接入序 列作为第二接入序列;
第二信号生成单元, 用于按照预置的子载波间隔将所述第二选取单元选取 的第二接入序列映射在指定的带宽上, 生成随机接入信号, 所述子载波间隔小 于 1.25KHZ;
第二发送单元, 用于发送所述第二信号生成单元生成的随机接入信号给基 站, 使基站根据所述随机接入信号中的所述第二接入序列确定往返传输时延; 所述第二接收单元, 还用于接收基站发送的已接入物理随机接入信道的指 示信息, 所述已接入的指示信息中携带所述往返传输时延;
第二调整单元, 用于根据所述第二接收单元接收到的已接入的指示信息中 携带的往返传输时延调整定时提前量, 使所述调整后的定时提前量完全补偿所 述往返传输时延。
一种基站, 包括:
第三接收单元, 用于接收终端发送的随机接入信号;
第二获取单元, 用于从所述第三接收单元接收的随机接入信号中获取携带 的第一接入序列;
第一确定单元, 用于通过所述第二获取单元获取的第一接入序列确定往返 传输时延;
第三发送单元, 用于向终端发送定时提前量调整命令, 所述定时提前量调 整命令携带所述第一确定单元确定的往返传输时延, 使终端根据所述往返传输 时延调整定时提前量;
所述第三接收单元, 还用于接收终端发送的第一消息;
解调单元, 用于对所述第三接收单元接收到的第一消息进行解调, 使所述 终端接入所述物理随机接入信道。
一种基站, 包括:
第四发送单元, 用于向终端发送随机接入指示信息, 所述随机接入指示信 息中携带指定的接入序列索引;
第四接收单元, 用于接收终端发送的随机接入信号;
第三获取单元, 用于并从所述第四接收单元接收到的随机接入信号中获取 第二接入序列;
第二确定单元, 用于通过所述第三获取单元获取的第二接入序列确定往返 传输时延;
所述第四发送单元, 还用于向终端发送的已接入物理随机接入信道的指示 信息, 所述已接入的指示信息中携带所述往返传输时延, 使终端根据所述往返 传输时延调整定时提前量, 使所述调整后的定时提前量完全补偿所述往返传输 时延。
一种随机接入系统, 包括终端和基站, 所述终端为上述技术方案所述的终 端, 所述基站为上述技术方案所述的基站。
本发明实施例采用获取终端所在小区使用的第一个接入序列的索引; 根据 所述第一个接入序列的索引, 从预建立的待选序列表中查询出终端所在小区使 用的规定数量的接入序列, 从所述查询出的规定数量的接入序列中选取任意一 个接入序列作为第一接入序列; 按照预置的子载波间隔将所述第一接入序列映 射在指定的带宽上, 生成第一随机接入信号, 所述子载波间隔小于 1.25KHZ; 发送所述第一随机接入信号给基站, 使基站根据所述随机接入信号中的所述第 一接入序列确定往返传输时延; 接收基站发送的定时提前量调整命令, 所述定 时提前量调整命令携带所述往返传输时延; 根据所述往返传输时延调整定时提 前量, 并以调整后的定时提前量发送第一消息给基站, 使基站解调所述第一消 息, 将所述终端接入物理随机接入信道。 与现有技术相比, 本发明实施例提供 的随机接入方法, 子载波间隔小于 1.25KHZ, 又根据所述子载波间隔调整了定 时提前量, 可以使距离基站 100KM以外的终端接入物理随机接入信道。
附图说明
图 1是本发明实施例中随机接入方法的一实施例示意图;
图 2是本发明实施例中随机接入方法的另一实施例示意图;
图 3是本发明实施例中随机接入方法的另一实施例示意图;
图 4是本发明实施例中随机接入方法的另一实施例示意图;
图 5是本发明一应用场景实施例示意图;
图 6是本发明另一应用场景实施例示意图;
图 7是本发明实施例中终端的一实施例示意图;
图 8是本发明实施例中终端的另一实施例示意图;
图 9是本发明实施例中终端的另一实施例示意图;
图 10是本发明实施例中终端的另一实施例示意图;
图 11是本发明实施例中终端的另一实施例示意图;
图 12是本发明实施例中终端的另一实施例示意图;
图 13是本发明实施例中基站的一实施例示意图;
图 14是本发明实施例中基站的另一实施例示意图;
图 15是本发明实施例中基站的另一实施例示意图;
图 16是本发明实施例提供的系统的一实施例示意图。
具体实施方式
本发明实施例提供一种随机接入方法, 可以使距离基站 100KM以外的终端 接入物理随机接入信道。 本发明实施例还提供了相应的终端、 基站及系统。 以 下分別进行详细说明。 参阅图 1, 从终端的角度来看, 本发明实施例提供的随机接入方法的一实施 例包括:
101、 获取终端所在小区使用的第一个接入序列的索引。 终端接入物理随机接入信道 (PRACH, Physical Random Access Channel) 包括竟争模式接入和非竟争模式接入, 本发明实施例重点讲述竟争模式的随机 接入过程。
实际上每个小区中的终端使用的接入序列的个数是预先规定好的, 比如, 常用 64个接入序列作为随机接入时的候选序列, 基站会将每个小区要使用的 64 个接入序列的第一个接入序列索引下发给每个小区, 该小区的终端就可根据该 第一个接入序列索引确定后面的 63个接入序列索引, 每个索引对应一个接入序 列, 从而确定这 64个接入序列。 例如: 基站向小区发送的第一个接入序列索引 为 x, 则 x~x+63对应 64个接入序列。
102、 根据所述第一个接入序列的索引, 从预建立的待选序列表中查询出终 端所在小区使用的规定数量的接入序列, 从所述查询出的规定数量的接入序列 中选取任意一个接入序列作为第一接入序列。
在竟争模式状态, 终端要接入 PRACH, 需要在生成随机接入信号时选取任 意一个接入序列 (Preamble序列;), 可选的, 所述接入序列为 ZC Zadoff-Chu)序列。 在现有技术中, PRACH的子载波间隔有两种, 一种是 1.25KHz, 另一种是 7.5 KHz, 这样接入序列的时域长度分別为 l/1.25=800us和 l/7.5=133us, 根据小区最 大半径的计算公式: 往返传输时延 (RTD, Round Trip Delay) 等于 2倍小区半径 除以光速, 表示为 RTD=2Rcell/c; 其中 Rcell为小区半径, c为光速 c=3*10A8;可以计 算出这两种载波间隔所支持的小区半径分別为 119.9KM和 19.9KM, 也就是, lkm 的小区半径对应的往返传播时延为 1000/(3*10A8)*2=6.67us, 因为协议中规定将 定时提前量 (TA, Timing Advance ) 的范围限制在了 0~1282, 每个数值对应 0.52us, 这样, 现有技术中 能支持的最大往返传输时间 间隔只能是 1282*0.52=667us,能支持的最大小区半径只能是 100KM。
本发明为实现 100KM以外的终端也能顺利接入 PRACH, 就需要使得接入序 列的时域长度大于或者等于往返传输时延, 用公式表示为: 1/ΔΛΑ >= β« * 2 /^ 其中 ΔΛΛ为子载波间隔, Rcell为小区半径, 这样就可以推导出子载波间隔 RA≤C 如果考虑到多径信道的影响, 则上述关系式为: lU Cel W 其中 ax表示最大的多径时延。 当小区半径为 100KM时, δ^Α要小于或者等于
1.5ΚΗζ, 因现有技术中的载波间隔为 1.25ΚΗζ, 为了保证 100KM以外的终端也能 顺利接入基站, 尤其是超远距离的终端也能顺利接入 PRACH, 如保证 200KM的 终端也能接入 PRACH, 子载间隔需要小于 1.25KHz, 例如, 如果考虑到多径时 延, 当 RceU = 222.1km, rmax = 5us时, pRACH子载波间隔可以设置为满足
ΔΛΛ <= 671 ·3ΗΖ的正值, 这里考虑到实现简单需要和 15ΚΗζ成倍数关系, 所以取
Figure imgf000009_0001
也就是当 δ Α=625ΗΖ时, 可以保证 222.7KM的终端接入 PRACH。 当然, 为了避免 TA的取值范围的限制, 需要将 TA扩展, 如现有技术中 TA有 11比特, 可将 TA扩展到 12比特, 这样 TA的取值范围可以为 0~4097, 折合成时间, 则能支持的最大往返传输时间间隔为 4097*0.52=2130us。
因子载波间隔变小了, 又因接入序列占用的带宽不变, 所以接入序列的长 度需要改变, 用公式表示子载波间隔、 接入序列的长度和指定带宽之间的关系, 可表示为: ^ * RA指定带宽, 其中指定带宽为定时精度的倒数, 如: 协议制 定的时候认为 TA估计的精度为 lus, l/lus=lMHz, 那么 lus对应 1MHz带宽; 其中 ^为接入序列的长度, δΑΑ为子载波间隔; 为了保证接入序列数的最大化, 取质数, 这样可用的接入序列总数就为!^!-1个。 例如, Δ Α=625ΗΖ时, 对于 1M带宽时, 需要满足1^约为 1600。 因接入序列的长度发生了变化, 所以要先建 立接入序列表, 接入序列的得来是由接入序列的长度和接入序列的索引决定 的, 如果要想保证可用的接入序列数最大, 那么 ^最好取质数, 假如取 1601, 那么就有 1600个可用的接入序列, 那么待选序列表中就有 1600个接入序列。
如果不取质数, 假如取 ^ =1602, 那么接入序列的索引范围就为 1~1601, 每个索引和1 ^ =1602就可以得到一个接入序列, 但这些接入序列里并不是每个 接入序列都适合作待选接入序列, 在低频偏场景下可以只选择接入序列的长度 和所述接入序列的索引互质的接入序列作为待选接入序列, 建立所述待选序列 表, 这个待选序列表的建立过程也就是根据所述预置的子载波间隔和所述指定 的带宽, 计算接入序列的长度; 根据所述接入序列的长度确定接入序列索引的 范围, 选取所述接入序列的长度和所述接入序列的索引互质的接入序列作为待 选接入序列, 建立所述待选序列表。
对于高频偏场景下, 在接入序列不仅要符合上述的互质条件, 还要满足指 定的移位值 du小于预置阈值; 其中指定的移位值 du指的是当频偏为 1/TSEQ时接收 器输出的镜像峰对于往返延迟的移位; TSEQ是接入序列的时域长度, 实际上 TSEQ 就是子载波间隔的倒数。
为了消除频偏导致的 RTD估计的二义性, 需要选择 du绝对值较小的接入序 列, 若实际频偏可以达到 ± Λ/Δ Α, 则 RTD估计的误差可以达到 [-N*du, N*du], 换 算成绝对时间为 [- ( N^du ) I ( Af^ ^L^ , ( N^du ) I ( 4 ^ * ) ], 单位是秒, N 是量化的阶数, 可以根据系统对 RTD误差的容忍度来设置 du的范围, 从而决定了 可用的接入序列个数,在本发明实施例中所提到的预置阈值实际上就是在 du的取 值满足 RTD最大误差容忍度时的 du值。
下面介绍一下 du的推导过程: 根据 3GPP TS 36.211协议中随机接入序列的定义, 第" th个 ZC序列表示为: ) = ^ Nzc , o≤"≤wzc— 1 (公式一) u称为物理根序列号, 其中 Nzc是所产出 ZC序列的总样点数。
当存在 Δ/ (单位为 Hz) 的频偏时, 有频偏的序列可以表示为: xu (n, Af) = ~J^^e^ 0≤"≤7VZC— 1 (公式二) 其中 TSEQ是上述 ZC序列的时域长度。 A/ =丄
当 TSEQ时, ¾ △/) = ^u (n - du] " (公式三) 其中 含义如下: (公式四)
Figure imgf000010_0001
其中, ^为^ ^) 1110^^ :1的最小非负整数, mod为取余运算符号, O ' )mod^c = 1表示 除以 Nzc, 余数为 1。
△/ =丄
因此, 当 TSEQ时, x" ("'△/) = x" ("_ ";
f = 1_
同理, 当 tSEQ时, ^ ("'△/)= ^ ; 因此, du指的是当频偏为 1 / T SEQ时接收器输出的镜像峰对于往返延迟的移 位, 当 Nzc为一固定值后, 根据公式三、 公式四可知, du由 u值决定, 同时 p也是 由 u值决定, 所以每个物理根序列号为 u的序列的 du值可以看作为序列本身的特 性。
对于高频偏场景下, 建立待选序列表的过程具体可以表述为: 根据所述预 置的子载波间隔和所述指定的带宽, 计算接入序列的长度。
根据所述接入序列的长度确定接入序列索引的范围, 选取所述接入序列的 长度和所述接入序列的索引互质, 并且指定的移位值 du小于预置阈值的接入序列 作为待选接入序列, 建立所述待选序列表, 本发明实施例中所提到的预置阈值 实际上就是在 du的取值满足 RTD最大误差容忍度时的 du值。
103、 按照预置的子载波间隔将所述第一接入序列映射在指定的带宽上, 生 成第一随机接入信号, 所述子载波间隔小于 1.25KHZ。 终端要发起随机接入时, 需要从上述两种方案建立的待选序列表中选取任 意一个接入序列, 并按照预置的子载波间隔将所述选取的接入序列映射在指定 的带宽上, 生成随机接入信号, 所述子载波间隔小于 1.25KHZ。 也就是说, 当终 端在低频偏场景下时, 只需要从满足接入索引与所述接入序列的长度互质条件 的待选序列表中选取任意一个接入序列, 按照预置的载波间隔, 将所述选取的 接入序列映射在指定的带宽上, 生成随机接入信号就可发起随机接入过程; 如 果终端是在高频偏场景下, 终端最好从既满足接入序列索引与所述接入序列的 长度互质, 又满足 du小于预置阈值的待选序列表中选取任意一个接入序列生成随 机接入信号, 发起随机接入过程, 这样可以避免产生过大的多普勒频移, 影响 RTD的判断。
104、 发送所述随机接入信号给基站, 使基站根据所述随机接入信号中的所 述接入序列确定往返传输时延。
终端发送步骤 103生成的随机接入信号给基站, 基站接收到所述随机接入信 号后, 获取所述随机接入信号中携带的第一接入序列, 确定终端所在小区使用 的规定数量的接入序列后, 用所述确定的规定数量的接入序列中的每一个接入 序列分別与所述第一接入序列做相关, 根据相关后最大的峰值位置确定所述往 返传输时延; 或者, 确定终端所在小区使用的规定数量的接入序列, 并用所述 确定的规定数量的接入序列中的每一个接入序列分別与所述第一接入序列做相 关, 根据相关后的首径峰值的位置确定所述往返传输时延, 首径就是终端发出 的一路信号在传输过程变成多路, 最先到达基站的这路信号称为首径。
105、 接收基站发送的定时提前量调整命令, 所述定时提前量调整命令中携 带基站确定出的往返传输时延。
基站确定往返传输时延后, 会将指示终端根据所述往返传输时延调整定时 提前量, 如当往返传输时延为 1334us时, 将 TA调整为 2564。
106、 根据所述往返传输时延调整定时提前量, 并以调整后的定时提前量发 送第一消息给基站, 使基站解调所述第一消息, 将所述终端接入物理随机接入 信道。
以调整后的定时提前量, 向基站发送第一消息, 所述第一消息包括所述终 端的标识。 基站接收到第一消息后, 解调所述第一消息, 将所述第一消息中携 带的终端标识携带在第二消息中, 发送所述第二消息给终端, 终端接收到所述 第二消息后, 识別所述第二消息中携带的终端标识, 当终端确认所述第二消息 中的终端标识是自己的终端标识, 发送接入响应消息给基站, 使基站确认所述 终端已经接入所述物理随机接入信道。 基站可能同时接收到几个终端的发送来的第一消息, 由于基站只能解调一 个终端的第一消息, 解调后基站会将该终端的标识携带在所述第二消息中, 以 便该终端确认是发送给自己的信息。
如果存在较大频偏将导致基站侧不能正确解调, 这里可以将频偏范围
H AUA/RA]分档, 建议每档间隔 ΐΚΗζ对第一消息进行解调。 实际上, 频偏范 围是由基站和 UE间的晶振偏差, 系统的载波频率, UE的移动速度和方向等综合 作用的结果, 本发明实施例用物理随机接入信道的子载波间隔来做了个量化而 已, N是量化的阶数。
本发明实施例中, 获取终端所在小区使用的第一个接入序列的索引; 根据 所述第一个接入序列的索引, 从预建立的待选序列表中查询出终端所在小区使 用的规定数量的接入序列, 从所述查询出的规定数量的接入序列中选取任意一 个接入序列作为第一接入序列; 按照预置的子载波间隔将所述第一接入序列映 射在指定的带宽上, 生成第一随机接入信号, 所述子载波间隔小于 1.25KHZ; 发 送所述第一随机接入信号给基站, 使基站根据所述随机接入信号中的所述第一 接入序列确定往返传输时延; 接收基站发送的定时提前量调整命令, 所述定时 提前量调整命令携带所述往返传输时延; 根据所述往返传输时延调整定时提前 量, 并以调整后的定时提前量发送第一消息给基站, 使基站解调所述第一消息, 将所述终端接入物理随机接入信道。 与现有技术相比, 本发明实施例提供的随 机接入方法, 子载波间隔小于 1.25KHZ, 又根据所述子载波间隔调整了定时提前 量, 可以使距离基站 100KM以外的终端接入物理随机接入信道。
参阅图 2, 从终端的角度来看, 本发明实施例提供的随机接入方法的一实施 例包括:
201、 接收基站发送的随机接入指示信息, 所述随机接入指示信息中携带指 定的接入序列索引。
本发明实施例重点讲述非竟争模式的随机接入过程, 非竟争模式的随机接 入是指终端按照基站的指示进行的随机接入过程。
基站侧和终端侧预置有相同的待选接入序列表, 当基站指定终端接入时, 在随机接入指示信息中携带指定的接入序列索引。
202、 根据所述指定的接入序列索引, 从预建立的待选序列表中选取与所述 的指定的接入序列索引对应的接入序列作为第二接入序列, 并按照预置的子载 波间隔将所述第二接入序列映射在指定的带宽上, 生成随机接入信号, 所述子 载波间隔小于 1.25KHZ。
终端接收到该随机接入指示信息后, 根据所述指定的接入序列索引, 从预 建立的待选序列表中选取所述的第二接入序列, 对于建立待选序列表, 本发明 实施例提供两种建立方案, 一种为: 根据所述预置的子载波间隔和所述指定的 带宽, 计算接入序列的长度。
根据所述接入序列的长度确定接入序列索引的范围, 选取所述接入序列的 长度和所述接入序列的索引互质的接入序列作为待选接入序列, 建立所述待选 序列表; 这种方案建立的待选序列表适用于低频偏场景下, 当与指定的接入序 列索引对应的接入序列是根序列索引与所述待选取的接入序列的长度互质的接 入序列, 那么终端从这个待选序列表中选取与指定的接入序列索引对应的接入 序列作为第二接入序列。 另一种为: 根据所述预置的子载波间隔和所述指定的 带宽, 计算接入序列的长度; 根据所述接入序列的长度确定接入序列索引的范 围, 选取所述接入序列的长度和所述接入序列的索引互质, 并且指定的移位值 du小于预置阈值的接入序列作为待选接入序列, 建立所述待选序列表; 这种方 案建立的待选序列表适用于高频偏场景下, 当基站指定的接入序列既要满足根 序列索引与所述待选取的接入序列的长度互质, 又要满足 du小于预置阈值, 那 么终端从这个待选序列表中选取与指定的接入序列索引对应的接入序列作为第 二接入序列。
终端选取到第二接入序列后, 按照预置的子载波间隔将所述第二接入序列 映射在指定的带宽上, 生成随机接入信号, 本发明实施例提供的子载波间隔的 调整方案与上述步骤 102和 103相同, 在此不做过多赘述。
203、 发送所述随机接入信号给基站, 使基站根据所述随机接入信号中的所 述第二接入序列确定往返传输时延。
本步骤与上述 104步骤相同, 在此不做过多赘述。
204、 接收基站发送的已接入物理随机接入信道的指示信息, 所述已接入的 指示信息中携带所述往返传输时延。
本实施例中是非竟争接入, 基站侧已经知道终端发送随机接入信号时所使 用的序列, 所以基站在接收到随机接入信号后, 就可让终端接收 PRACH。
205、 根据所述往返传输时延调整定时提前量, 使所述调整后的定时提前量 完全补偿所述往返传输时延。
本步骤与上述 106步骤相同, 在此不做过多赘述。
本发明实施例中, 接收基站发送的随机接入指示信息, 所述随机接入指示 信息中携带指定的接入序列索引; 根据所述指定的接入序列索引, 从预建立的 待选序列表中选取与所述的指定的接入序列索引对应的接入序列作为第二接入 序列, 并按照预置的子载波间隔将所述第二接入序列映射在指定的带宽上, 生 成随机接入信号, 所述子载波间隔小于 1.25KHZ ; 发送所述随机接入信号给基 站, 使基站根据所述随机接入信号中的所述第二接入序列确定往返传输时延; 接收基站发送的已接入物理随机接入信道的指示信息, 所述已接入的指示信息 中携带所述往返传输时延; 根据所述往返传输时延调整定时提前量, 使所述调 整后的定时提前量完全补偿所述往返传输时延。 与现有技术相比, 本发明实施 例提供的随机接入方法, 可以满足远距离、 高速度的终端接入物理随机接入信 道。
参阅图 3, 从基站的角度来看, 本发明实施例提供的随机接入方法的另一实 施例包括:
301、 接收终端发送的随机接入信号, 并从所述随机接入信号中获取携带的 第一接入序列。
对于竟争模式接入的情况, 基站接收到终端发送的随机接入信号后, 从所 述随机接入信号中获取第一接入序列。
302、 通过所述第一接入序列确定往返传输时延。
本发明实施例提供的确定往返传输时延有两种方案:
一种为: 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的 规定数量的接入序列中的每一个接入序列分別与所述第一接入序列做相关, 根 据相关后最大的峰值位置确定所述往返传输时延。
另一种为: 确定终端所在小区使用的规定数量的接入序列, 并用所述确定 的规定数量的接入序列中的每一个接入序列分別与所述第一接入序列做相关, 根据相关后的首径峰值的位置确定所述往返传输时延。
基站中的待选序列表与终端中的待选序列表相同。
303、 向终端发送定时提前量调整命令, 所述定时提前量调整命令携带所述 确定的往返传输时延, 使终端根据所述往返传输时延调整定时提前量。
基站确定往返传输时延后, 向终端发送定时提前量调整命令, 将确定的往 返传输时延携带在所述定时提前量调整命令中, 使终端根据所述往返传输时延 调整定时提前量, 如当往返传输时延为 1334us时, 将 TA调整为 2564。
304、 接收终端发送的第一消息, 并对所述第一消息进行解调, 使所述终端 接入所述物理随机接入信道。
对于频偏较大的情况, 可先获取频率偏移的范围, 并对所述频率偏移的范 围进行分档; 在所述分档后的频率偏移范围内, 分別解调所述第一消息。 如果 存在较大频偏将导致基站侧不能正确解调, 这里可以将频偏范围 [- ^ ^^A J 分档, 建议每档间隔 ΙΚΗζ对第一消息进行解调。 实际上, 频偏范围是由基站和 UE间的晶振偏差, 系统的载波频率, UE的移动速度和方向等综合作用的结果, 本发明实施例用物理随机接入信道的子载波间隔来做了个量化而已, N是量化的 阶数。
基站从所述第一消息中获取所述终端标识后, 向终端发送第二消息, 并将 所述终端标识携带在所述第二消息中, 以便该终端确认是发送给自己的信息。 终端从所述第二消息出识別终端标识后, 向基站发送接入响应消息, 基站接收 终端发送的接入响应消息, 以确认所述终端接入物理随机接入信道。
本发明实施例中, 接收终端发送的随机接入信号, 并从所述随机接入信号 中获取携带的第一接入序列; 通过所述第一接入序列确定往返传输时延; 向终 端发送定时提前量调整命令, 所述定时提前量调整命令携带所述确定的往返传 输时延, 使终端根据所述往返传输时延调整定时提前量; 接收终端发送的第一 消息, 并对所述第一消息进行解调, 使所述终端接入所述物理随机接入信道。 与现有技术相比, 本发明实施例提供的随机接入方法, 可以使远距离、 高速度 的终端接入 PRACH。
参阅图 4, 从基站的角度来看, 本发明实施例提供的随机接入方法的另一实 施例包括:
401、 向终端发送随机接入指示信息, 所述随机接入指示信息中携带指定的 接入序列索引。
对于非竟争模式的随机接入, 基站在发送随机接入指示信息时, 就指定了 终端的随机接入序列。
402、 接收终端发送的随机接入信号, 并从所述随机接入信号中获取第二接 入序列。
403、 通过所述第二接入序列确定往返传输时延。
基站侧接收到终端的随机接入信号, 基站根据终端所在小区的第一个接入 序列索引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规 定数量的接入序列中的每一个接入序列分別与所述第二接入序列做相关, 根据 相关后最大的峰值位置确定所述往返传输时延, 或者, 根据终端所在小区的第 一个接入序列索引, 确定终端所在小区使用的规定数量的接入序列, 并用所述 确定的规定数量的接入序列中的每一个接入序列分別与所述第二接入序列做相 关, 根据相关后的首径峰值的位置确定所述往返传输时延。
404、 向终端发送的已接入物理随机接入信道的指示信息, 所述已接入的指 示信息中携带所述往返传输时延, 使终端根据所述往返传输时延调整定时提前 量, 使所述调整后的定时提前量完全补偿所述往返传输时延。 本实施例中是非竟争接入, 基站侧已经知道终端发送随机接入信号时所使 用的序列, 所以基站在接收到随机接入信号后, 就可让终端接收 PRACH。
本发明实施例中, 向终端发送随机接入指示信息, 所述随机接入指示信息 中携带第二接入序列; 接收终端发送的随机接入信号, 并从所述随机接入信号 中获取第二接入序列; 通过所述第二接入序列确定往返传输时延; 向终端发送 的已接入物理随机接入信道的指示信息, 所述已接入的指示信息中携带所述往 返传输时延, 使终端根据所述往返传输时延调整定时提前量, 使所述调整后的 定时提前量完全补偿所述往返传输时延。 与现有技术相比, 本发明实施例提供 的随机接入方法, 可以使远距离、 高速度的终端接入 PRACH。
参阅图 5、 为便于理解, 下面以一个具体的应用场景来描述竟争模式的随机 接入过程:
Al、 终端获取基站发送的第一个接入序列索引, 根据所述第一个接入序列 索引, 从预建立的待选序列表中查询出终端所在小区使用的规定数量的接入序 列, 从所述查询出的规定数量的接入序列中选取任意一个接入序列作为第一接 入序列, 并按照预置的子载波间隔将所述第一接入序列映射在指定的带宽上, 生成随机接入信号, 所述子载波间隔小于 1.25KHZ。
A2、 终端发送所述随机接入信号给基站。
A3、基站根据所述随机接入信号中的所述第一接入序列确定往返传输时延。
A4、 基站发送定时提前量调整命令, 所述定时提前量调整命令中携带基站 确定出的往返传输时延。
A5、 终端根据所述往返传输时延调整定时提前量, 使所述调整后的定时提 前量完全补偿所述往返传输时延。
A6、 终端以调整后的定时提前量, 向基站发送第一消息。
A7、 基站发送第二消息给终端, 所述第二消息中携带的终端标识。
A8、 终端识別所述第二消息中携带的终端标识, 当所述终端标识与自身的 标识相同, 发送接入响应消息给基站, 使基站确认所述终端已经接入所述物理 随机接入信道。
参阅图 6, 为便于理解, 面以一个具体的应用场景来描述非竟争模式的随机 接入过程:
Bl、 基站发送随机接入指示信息, 所述随机接入指示信息中携带指定的接 入序列索引。
B2、 终端根据所述指定的接入序列索引, 从预建立的待选序列表中选取与 所述的指定的接入序列索引对应的接入序列作为第二接入序列, 并按照预置的 子载波间隔将所述指定的接入序列映射在指定的带宽上, 生成随机接入信号, 所述子载波间隔小于 1.25KHZ。
B3、 发送所述随机接入信号给基站, 使基站根据所述随机接入信号中的所 述第二接入序列确定往返传输时延。
B4、 基站根据所述随机接入信号中的所述接入序列确定往返传输时延。 B5、 基站向终端发送的已接入物理随机接入信道的指示信息, 所述已接入 的指示信息中携带所述往返传输时延, 使终端根据所述往返传输时延调整定时 提前量, 使所述调整后的定时提前量完全补偿所述往返传输时延。
参阅图 7, 本发明实施例提供的终端的一实施例包括:
第一获取单元 501, 用于获取终端所在小区使用的第一个接入序列的索引; 第一查询单元 502, 用于根据所述第一获取单元 501获取的第一个接入序列 的索引, 从预建立的待选序列表中查询出终端所在小区使用的规定数量的接入 序列;
第一选取单元 503, 用于从所述第一查询单元 502查询出的规定数量的接入 序列中选取任意一个接入序列作为第一接入序列;
第一信号生成单元 504, 用于按照预置的子载波间隔将所述第一选取单元 503选取的第一接入序列映射在指定的带宽上, 生成第一随机接入信号, 所述子 载波间隔小于 1.25KHZ;
第一发送单元 505, 用于发送所述第一信号生成单元 504生成的第一随机接 入信号给基站, 使基站根据所述随机接入信号中的所述第一接入序列确定往返 传输时延;
第一接收单元 506, 用于接收基站发送的定时提前量调整命令, 所述定时提 前量调整命令携带所述往返传输时延;
第一调整单元 507, 用于根据所述第一接收单元 506接收到的定时提前量调 整命令中携带的往返传输时延调整定时提前量;
所述第一发送单元 505, 用于以所述第一调整单元 507调整后的定时提前量 发送第一消息给基站, 使基站解调所述第一消息, 将所述终端接入物理随机接 入信道。
本发明实施例中, 第一获取单元 501获取终端所在小区使用的第一个接入序 列的索引; 第一查询单元 502根据所述第一获取单元 501获取的第一个接入序列 的索引, 从预建立的待选序列表中查询出终端所在小区使用的规定数量的接入 序列; 第一选取单元 503从所述第一查询单元 502查询出的规定数量的接入序列 中选取任意一个接入序列作为第一接入序列; 第一信号生成单元 504按照预置的 子载波间隔将所述第一选取单元 503选取的第一接入序列映射在指定的带宽 上, 生成第一随机接入信号, 所述子载波间隔小于 1.25KHZ; 第一发送单元 505 发送所述第一信号生成单元 504生成的第一随机接入信号给基站, 使基站根据所 述随机接入信号中的所述第一接入序列确定往返传输时延; 第一接收单元 506接 收基站发送的定时提前量调整命令, 所述定时提前量调整命令携带所述往返传 输时延; 第一调整单元 507根据所述第一接收单元 506接收到的定时提前量调整 命令中携带的往返传输时延调整定时提前量; 所述第一发送单元 505以所述第一 调整单元 507调整后的定时提前量发送第一消息给基站, 使基站解调所述第一消 息, 将所述终端接入物理随机接入信道。 本发明实施例提供的终端, 在远距离、 高速度移动时也可以接入 PRACH。
参阅图 8, 在图 7对应的实施例的基础上, 本发明实施例提供的终端的另一 实施例还包括:
第一计算单元 508, 用于根据所述预置的子载波间隔和所述指定的带宽, 计 算接入序列的长度;
所述第一选取单元 503, 还用于根据所述第一计算单元 508计算出的接入序 列的长度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列 的索引互质的接入序列作为待选接入序列, 建立所述待选序列表。
参阅图 9, 在图 7对应的实施例的基础上, 本发明实施例提供的终端的另一 实施例还包括:
第二计算单元 509, 用于根据所述预置的子载波间隔和所述指定的带宽, 计 算接入序列的长度;
所述第一选取单元 503, 还用于根据所述第二计算单元 509计算出的接入序 列的长度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列 的索引互质, 并且指定的移位值 du小于预置阈值的接入序列作为待选接入序 列, 建立所述待选序列表。
参阅图 10, 本发明实施例提供的终端的另一实施例包括:
第二接收单元 511, 用于接收基站发送的随机接入指示信息, 所述随机接入 指示信息中携带指定的接入序列索引;
第二选取单元 512, 根据所述第二接收单元 511接收到的指定的接入序列索 引, 从预建立的待选序列表中选取与所述的指定的接入序列索引对应的接入序 列作为第二接入序列;
第二信号生成单元 513, 用于按照预置的子载波间隔将所述第二选取单元 512选取的第二接入序列映射在指定的带宽上, 生成随机接入信号, 所述子载波 间隔小于 1.25KHZ ;
第二发送单元 514, 用于发送所述第二信号生成单元 513生成的随机接入信 号给基站, 使基站根据所述随机接入信号中的所述第二接入序列确定往返传输 时延;
所述第二接收单元 511, 还用于接收基站发送的已接入物理随机接入信道的 指示信息, 所述已接入的指示信息中携带所述往返传输时延;
第二调整单元 515, 用于根据所述第二接收单元 511接收到的已接入的指示 信息中携带的往返传输时延调整定时提前量, 使所述调整后的定时提前量完全 补偿所述往返传输时延。
本发明实施例中, 第二接收单元 511接收基站发送的随机接入指示信息, 所 述随机接入指示信息中携带指定的接入序列索引; 第二选取单元 512根据所述第 二接收单元 511接收到的指定的接入序列索引, 从预建立的待选序列表中选取与 所述的指定的接入序列索引对应的接入序列作为第二接入序列; 第二信号生成 单元 513按照预置的子载波间隔将所述第二选取单元 512选取的第二接入序列映 射在指定的带宽上, 生成随机接入信号, 所述子载波间隔小于 1.25KHZ; 第二发 送单元 514发送所述第二信号生成单元 513生成的随机接入信号给基站, 使基站 根据所述随机接入信号中的所述第二接入序列确定往返传输时延; 所述第二接 收单元 511接收基站发送的已接入物理随机接入信道的指示信息, 所述已接入的 指示信息中携带所述往返传输时延; 第二调整单元 515根据所述第二接收单元 511接收到的已接入的指示信息中携带的往返传输时延调整定时提前量, 使所述 调整后的定时提前量完全补偿所述往返传输时延。 本发明实施例提供的终端, 在远距离、 高速度移动时也可以接入 PRACH。
参阅图 11, 在上述图 10对应的实施例的基础上, 本发明实施例提供的终端 的另一实施例还包括:
第三计算单元 516, 用于根据所述预置的子载波间隔和所述指定的带宽, 计 算接入序列的长度;
所述第二选取单元 512, 还用于根据所述第三计算单元 516计算出的接入序 列的长度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列 的索引互质的接入序列作为待选接入序列, 建立所述待选序列表。
参阅图 12, 在上述图 10对应的实施例的基础上, 本发明实施例提供的终端 的另一实施例还包括:
第四计算单元 517, 用于根据所述预置的子载波间隔和所述指定的带宽, 计 算接入序列的长度; 所述第二选取单元 512, 还用于根据所述第四计算单元计算出的接入序列的 长度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列的索 引互质, 并且指定的移位值 du小于预置阈值的接入序列作为待选接入序列, 建 立所述待选序列表。
参阅图 13, 本发明实施例提供的基站的一实施例包括:
第三接收单元 601, 用于接收终端发送的随机接入信号;
第二获取单元 602, 用于从所述第三接收单元 601接收的随机接入信号中获 取携带的第一接入序列;
第一确定单元 603, 用于通过所述第二获取单元 602获取的第一接入序列确 定往返传输时延;
第三发送单元 604, 用于向终端发送定时提前量调整命令, 所述定时提前量 调整命令携带所述第一确定单元 603确定的往返传输时延;
所述第三接收单元 601, 还用于接收终端发送的第一消息;
解调单元 605, 用于对所述第三接收单元 601接收到的第一消息进行解调, 从所述第一消息中获取所述终端标识;
所述第三发送单元 604, 还用于向终端发送第二消息, 并将所述解调单元 605 获取的终端标识携带在所述第二消息中;
所述第三接收单元 601, 还用于接收终端发送的接入响应消息, 以确认所述 终端接入物理随机接入信道。
本发明实施例中, 第三接收单元 601接收终端发送的随机接入信号; 第二获 取单元 602从所述第三接收单元 601接收的随机接入信号中获取携带的第一接入 序列; 第一确定单元 603通过所述第二获取单元 602获取的第一接入序列确定往 返传输时延; 第三发送单元 604向终端发送定时提前量调整命令, 所述定时提前 量调整命令携带所述第一确定单元 603确定的往返传输时延; 所述第三接收单元 601接收终端发送的第一消息; 解调单元 605对所述第三接收单元 601接收到的第 一消息进行解调, 从所述第一消息中获取所述终端标识; 所述第三发送单元 604 向终端发送第二消息, 并将所述解调单元 604获取的终端标识携带在所述第二消 息中; 所述第三接收单元 601接收终端发送的接入响应消息, 以确认所述终端接 入物理随机接入信道。 本发明实施例提供的基站, 可以保证远距离、 高速度移 动的终端, 也可以接入 PRACH。
在上述图 13对应的实施例的基础上,
所述第一确定单元 603, 具体用于根据终端所在小区的第一个接入序列索 引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量 的接入序列中的每一个接入序列分別与所述第一接入序列做相关, 根据相关后 最大的峰值位置确定所述往返传输时延。
所述第一确定单元 603, 具体用于根据终端所在小区的第一个接入序列索 引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量 的接入序列中的每一个接入序列分別与所述第一接入序列做相关, 根据相关后 的首径峰值的位置确定所述往返传输时延。
参阅图 14, 在上述图 13对应的实施例的基础上, 所述解调单元 605包括: 获取模块 6051, 用于获取频率偏移的范围;
分档模块 6052, 用于对所述获取模块 6051获取的频率偏移的范围进行分档; 解调模块 6053, 用于在所述分档模块 6052分档后的频率偏移范围内, 分別 解调所述第一消息。
参阅图 15, 本发明实施例提供的基站的另一实施例包括:
第四发送单元 611, 用于向终端发送随机接入指示信息, 所述随机接入指示 信息中携带指定的接入序列索引;
第四接收单元 612, 用于接收终端发送的随机接入信号;
第三获取单元 613, 用于并从所述第四接收单元 612接收到的随机接入信号 中获取第二接入序列;
第二确定单元 614, 用于通过所述第三获取单元获取的第二接入序列确定往 返传输时延;
所述第四发送单元 611, 还用于向终端发送的已接入物理随机接入信道的指 示信息, 所述已接入的指示信息中携带所述往返传输时延, 使终端根据所述往 返传输时延调整定时提前量, 使所述调整后的定时提前量完全补偿所述往返传 输时延。
本发明实施例中, 第四发送单元 611向终端发送随机接入指示信息, 所述随 机接入指示信息中携带指定的接入序列索引; 第四接收单元 612接收终端发送的 随机接入信号; 第三获取单元 613并从所述第四接收单元 612接收到的随机接入 信号中获取第二接入序列; 第二确定单元 614通过所述第三获取单元获取的第二 接入序列确定往返传输时延; 所述第四发送单元 611向终端发送的已接入物理随 机接入信道的指示信息, 所述已接入的指示信息中携带所述往返传输时延, 使 终端根据所述往返传输时延调整定时提前量, 使所述调整后的定时提前量完全 补偿所述往返传输时延。 本发明实施例提供的基站, 可以保证远距离、 高速度 移动的终端, 也可以接入 PRACH。
在上述图 15对应的实施例的基础上, 所述第二确定单元 614, 具体用于根据终端所在小区的第一个接入序列索 引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量 的接入序列中的每一个接入序列分別与所述第二接入序列做相关, 根据相关后 最大的峰值位置确定所述往返传输时延。
所述第二确定单元 614, 具体用于根据终端所在小区的第一个接入序列索 引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量 的接入序列中的每一个接入序列分別与所述第二接入序列做相关, 根据相关后 的首径峰值的位置确定所述往返传输时延。
参阅图 16, 本发明实施例提供的随机接入系统的一实施例包括: 终端 50和 基站 60 ;
竟争模式下:
所述终端 50, 用于获取基站发送的第一个接入序列索引, 根据所述第一个 接入序列索引, 从预建立的待选序列表中查询出终端所在小区使用的规定数量 的接入序列, 从所述查询出的规定数量的接入序列中选取任意一个接入序列作 为第一接入序列, 并按照预置的子载波间隔将所述第一接入序列映射在指定的 带宽上, 生成随机接入信号, 所述子载波间隔小于 1.25KHZ; 发送所述随机接入 信号给基站, 使基站根据所述随机接入信号中的所述接入序列确定往返传输时 延; 接收基站发送的定时提前量调整命令, 所述定时提前量调整命令中携带基 站确定出的往返传输时延; 根据所述往返传输时延调整定时提前量, 使所述调 整后的定时提前量完全补偿所述往返传输时延; 以调整后的定时提前量, 向基 站发送第一消息; 接收第二消息, 并识別所述第二消息中携带的终端标识; 当 所述终端标识与自身的标识相同, 发送接入响应消息给基站, 使基站确认所述 终端已经接入所述物理随机接入信道。
所述基站 60, 用于接收终端发送的随机接入信号, 并从所述随机接入信号 中获取携带的接入序列索引; 通过所述携带的第一接入序列确定往返传输时 延; 向终端发送定时提前量调整命令, 所述定时提前量调整命令携带所述确定 的往返传输时延; 接收终端发送的第一消息, 并对所述第一消息进行解调, 从 所述第一消息中获取所述终端标识; 向终端发送第二消息, 并将所述终端标识 携带在所述第二消息中; 接收终端发送的接入响应消息, 以确认所述终端接入 物理随机接入信道。
非竟争模式下:
所述终端 50, 用于接收基站发送的随机接入指示信息, 所述随机接入指示 信息中携带指定的接入序列索引; 根据所述指定的接入序列索引, 从预建立的 待选序列表中选取与所述的指定的接入序列索引对应的接入序列作为第二接入 序列, 并按照预置的子载波间隔将所述第二接入序列映射在指定的带宽上, 生 成随机接入信号, 所述子载波间隔小于 1.25KHZ ; 发送所述随机接入信号给基 站, 使基站根据所述随机接入信号中的所述第二接入序列确定往返传输时延; 接收基站发送的已接入物理随机接入信道的指示信息, 所述已接入的指示信息 中携带所述往返传输时延; 根据所述往返传输时延调整定时提前量, 使所述调 整后的定时提前量完全补偿所述往返传输时延。
所述基站 60, 用于向终端发送随机接入指示信息, 所述随机接入指示信息 中携带指定的接入序列索引; 接收终端发送的随机接入信号, 并从所述随机接 入信号中获取第二接入序列; 通过所述第二接入序列确定往返传输时延; 向终 端发送的已接入物理随机接入信道的指示信息, 所述已接入的指示信息中携带 所述往返传输时延, 使终端根据所述往返传输时延调整定时提前量, 使所述调 整后的定时提前量完全补偿所述往返传输时延。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤 是可以通过程序来指令相关的硬件来完成, 该程序可以存储于一计算机可读存 储介质中, 存储介质可以包括: ROM、 RAM, 磁盘或光盘等。
以上对本发明实施例所提供的随机接入方法、 终端、 基站以及系统进行了 上实施例的说明只是用于帮助理解本发明的方法及其核心思想; 同时, 对于本 领域的一般技术人员, 依据本发明的思想, 在具体实施方式及应用范围上均会 有改变之处, 综上所述, 本说明书内容不应理解为对本发明的限制。

Claims

权利要求书
1、 一种随机接入方法, 其特征在于, 包括:
获取终端所在小区使用的第一个接入序列的索引;
根据所述第一个接入序列的索引, 从预建立的待选序列表中查询出终端所 在小区使用的规定数量的接入序列, 从所述查询出的规定数量的接入序列中选 取任意一个接入序列作为第一接入序列;
按照预置的子载波间隔将所述第一接入序列映射在指定的带宽上, 生成第 一随机接入信号, 所述子载波间隔小于 1.25KHZ;
发送所述随机接入信号给基站, 使基站根据所述随机接入信号中的所述第 一接入序列确定往返传输时延;
接收基站发送的定时提前量调整命令, 所述定时提前量调整命令携带所述 往返传输时延;
根据所述往返传输时延调整定时提前量, 并以调整后的定时提前量发送第 一消息给基站, 使基站解调所述第一消息, 将所述终端接入物理随机接入信道。
2、 根据权利要求 1所述的方法, 其特征在于, 所述从预建立的待选序列表 中查询出终端所在小区使用的规定数量的接入序列之前, 还包括:
根据所述预置的子载波间隔和所述指定的带宽, 计算接入序列的长度; 根据所述接入序列的长度确定接入序列索引的范围, 选取所述接入序列的 长度和所述接入序列的索引互质的接入序列作为待选接入序列, 建立所述待选 序列表。
3、 根据权利要求 1所述的方法, 其特征在于, 所述从预建立的待选序列表 中查询出终端所在小区使用的规定数量的接入序列之前, 还包括:
根据所述预置的子载波间隔和所述指定的带宽, 计算接入序列的长度; 根据所述接入序列的长度确定接入序列索引的范围, 选取所述接入序列的 长度和所述接入序列的索引互质, 并且指定的移位值 du小于预置阈值的接入序 列作为待选接入序列, 建立所述待选序列表。
4、 一种随机接入方法, 其特征在于, 包括:
接收基站发送的随机接入指示信息, 所述随机接入指示信息中携带指定的 接入序列索引;
根据所述指定的接入序列索引, 从预建立的待选序列表中选取与所述的指 定的接入序列索引对应的接入序列作为第二接入序列, 并按照预置的子载波间 隔将所述第二接入序列映射在指定的带宽上, 生成随机接入信号, 所述子载波 间隔小于 1.25KHZ ;
发送所述随机接入信号给基站, 使基站根据所述随机接入信号中的所述第 二接入序列确定往返传输时延;
接收基站发送的已接入物理随机接入信道的指示信息, 所述已接入的指示 信息中携带所述往返传输时延;
根据所述往返传输时延调整定时提前量, 使所述调整后的定时提前量完全 补偿所述往返传输时延。
5、 根据权利要求 4所述的方法, 其特征在于, 所述从预建立的待选序列表 中选取与所述的指定的接入序列索引对应的接入序列作为第二接入序列之前, 还包括:
根据所述预置的子载波间隔和所述指定的带宽, 计算接入序列的长度; 根据所述接入序列的长度确定接入序列索引的范围, 选取所述接入序列的 长度和所述接入序列的索引互质的接入序列作为待选接入序列, 建立所述待选 序列表。
6、 根据权利要求 4所述的方法, 其特征在于, 所述从预建立的待选序列表 中选取与所述的指定的接入序列索引对应的接入序列作为第二接入序列之前, 还包括:
根据所述预置的子载波间隔和所述指定的带宽, 计算接入序列的长度; 根据所述接入序列的长度确定接入序列索引的范围, 选取所述接入序列的 长度和所述接入序列的索引互质, 并且指定的移位值 du小于预置阈值的接入序 列作为待选接入序列, 建立所述待选序列表。
7、 一种随机接入方法, 其特征在于, 包括:
接收终端发送的随机接入信号, 并从所述随机接入信号中获取携带的第一 接入序列;
通过所述第一接入序列确定往返传输时延;
向终端发送定时提前量调整命令, 所述定时提前量调整命令携带所述确定 的往返传输时延, 使终端根据所述往返传输时延调整定时提前量;
接收终端发送的第一消息, 并对所述第一消息进行解调, 使所述终端接入 所述物理随机接入信道。
8、 根据权利要求 7所述的方法, 其特征在于, 所述通过所述携带的第一接 入序列确定往返传输时延, 具体包括:
根据终端所在小区的第一个接入序列索引, 确定终端所在小区使用的规定 数量的接入序列, 并用所述确定的规定数量的接入序列中的每一个接入序列分 別与所述第一接入序列做相关, 根据相关后最大的峰值位置确定所述往返传输 时延。
9、 根据权利要求 7所述的方法, 其特征在于, 所述通过所述携带的第一接 入序列确定往返传输时延, 具体包括:
根据终端所在小区的第一个接入序列索引, 确定终端所在小区使用的规定 数量的接入序列, 并用所述确定的规定数量的接入序列中的每一个接入序列分 別与所述第一接入序列做相关, 根据相关后的首径峰值的位置确定所述往返传 输时延。
10、 根据权利要求 7~9任意一项所述的方法, 其特征在于, 所述对所述第一 消息进行解调, 具体包括:
获取频率偏移的范围, 并对所述频率偏移的范围进行分档;
在所述分档后的频率偏移范围内, 分別解调所述第一消息。
11、 一种随机接入方法, 其特征在于, 包括:
向终端发送随机接入指示信息, 所述随机接入指示信息中携带指定的接入 序列索引;
接收终端发送的随机接入信号, 并从所述随机接入信号中获取第二接入序 列;
通过所述第二接入序列确定往返传输时延;
向终端发送的已接入物理随机接入信道的指示信息, 所述已接入的指示信 息中携带所述往返传输时延, 使终端根据所述往返传输时延调整定时提前量, 使所述调整后的定时提前量完全补偿所述往返传输时延。
12、 根据权利要求 11所述的方法, 其特征在于, 所述通过所述第二接入序 列确定往返传输时延, 具体包括:
根据终端所在小区的第一个接入序列索引, 确定终端所在小区使用的规定 数量的接入序列, 并用所述确定的规定数量的接入序列中的每一个接入序列分 別与所述第二接入序列做相关, 根据相关后最大的峰值位置确定所述往返传输 时延。
13、 根据权利要求 11所述的方法, 其特征在于, 所述通过所述第二接入序 列确定往返传输时延, 具体包括:
根据终端所在小区的第一个接入序列索引, 确定终端所在小区使用的规定 数量的接入序列, 并用所述确定的规定数量的接入序列中的每一个接入序列分 別与所述第二接入序列做相关, 根据相关后的首径峰值的位置确定所述往返传 输时延。
14、 一种终端, 其特征在于, 包括:
第一获取单元, 用于获取终端所在小区使用的第一个接入序列的索引; 第一查询单元, 用于根据所述第一获取单元获取的第一个接入序列的索 引, 从预建立的待选序列表中查询出终端所在小区使用的规定数量的接入序列; 第一选取单元, 用于从所述第一查询单元查询出的规定数量的接入序列中 选取任意一个接入序列作为第一接入序列;
第一信号生成单元, 用于按照预置的子载波间隔将所述第一选取单元选取 的第一接入序列映射在指定的带宽上, 生成第一随机接入信号, 所述子载波间 隔小于 1.25KHZ;
第一发送单元, 用于发送所述第一信号生成单元生成的第一随机接入信号 给基站, 使基站根据所述随机接入信号中的所述第一接入序列确定往返传输时 延;
第一接收单元, 用于接收基站发送的定时提前量调整命令, 所述定时提前 量调整命令携带所述往返传输时延;
第一调整单元, 用于根据所述第一接收单元接收到的定时提前量调整命令 中携带的往返传输时延调整定时提前量;
所述第一发送单元, 用于以所述第一调整单元调整后的定时提前量发送第 一消息给基站, 使基站解调所述第一消息, 将所述终端接入物理随机接入信道。
15、 根据权利要求 14所述的终端, 其特征在于, 还包括:
第一计算单元, 用于根据所述预置的子载波间隔和所述指定的带宽, 计算 接入序列的长度;
所述第一选取单元, 还用于根据所述第一计算单元计算出的接入序列的长 度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列的索引 互质的接入序列作为待选接入序列, 建立所述待选序列表。
16、 根据权利要求 14所述的终端, 其特征在于, 还包括:
第二计算单元, 用于根据所述预置的子载波间隔和所述指定的带宽, 计算 接入序列的长度;
所述第一选取单元, 还用于根据所述第二计算单元计算出的接入序列的长 度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列的索引 互质, 并且指定的移位值 du小于预置阈值的接入序列作为待选接入序列, 建立 所述待选序列表。
17、 一种终端, 其特征在于, 包括:
第二接收单元, 用于接收基站发送的随机接入指示信息, 所述随机接入指 示信息中携带指定的接入序列索引;
第二选取单元, 用于根据所述第二接收单元接收到的指定的接入序列索 引, 从预建立的待选序列表中选取与所述的指定的接入序列索引对应的接入序 列作为第二接入序列;
第二信号生成单元, 用于按照预置的子载波间隔将所述第二选取单元选取 的第二接入序列映射在指定的带宽上, 生成随机接入信号, 所述子载波间隔小 于 1.25KHZ;
第二发送单元, 用于发送所述第二信号生成单元生成的随机接入信号给基 站, 使基站根据所述随机接入信号中的所述第二接入序列确定往返传输时延; 所述第二接收单元, 还用于接收基站发送的已接入物理随机接入信道的指 示信息, 所述已接入的指示信息中携带所述往返传输时延;
第二调整单元, 用于根据所述第二接收单元接收到的已接入的指示信息中 携带的往返传输时延调整定时提前量, 使所述调整后的定时提前量完全补偿所 述往返传输时延。
18、 根据权利要求 17所述的终端, 其特征在于, 还包括:
第三计算单元, 用于根据所述预置的子载波间隔和所述指定的带宽, 计算 接入序列的长度;
所述第二选取单元, 还用于根据所述第三计算单元计算出的接入序列的长 度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列的索引 互质的接入序列作为待选接入序列, 建立所述待选序列表。
19、 根据权利要求 17所述的终端, 其特征在于, 还包括:
第四计算单元, 用于根据所述预置的子载波间隔和所述指定的带宽, 计算 接入序列的长度;
所述第二选取单元, 还用于根据所述第四计算单元计算出的接入序列的长 度确定接入序列索引的范围, 选取所述接入序列的长度和所述接入序列的索引 互质, 并且指定的移位值 du小于预置阈值的接入序列作为待选接入序列, 建立 所述待选序列表。
20、 一种基站, 其特征在于, 包括:
第三接收单元, 用于接收终端发送的随机接入信号;
第二获取单元, 用于从所述第三接收单元接收的随机接入信号中获取携带 的第一接入序列;
第一确定单元, 用于通过所述第二获取单元获取的第一接入序列确定往返 传输时延; 第三发送单元, 用于向终端发送定时提前量调整命令, 所述定时提前量调 整命令携带所述第一确定单元确定的往返传输时延, 使终端根据所述往返传输 时延调整定时提前量;
所述第三接收单元, 还用于接收终端发送的第一消息;
解调单元, 用于对所述第三接收单元接收到的第一消息进行解调, 使所述 终端接入所述物理随机接入信道。
21、 根据权利要求 20所述的基站, 其特征在于,
所述第一确定单元, 具体用于根据终端所在小区的第一个接入序列索引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量的接 入序列中的每一个接入序列分別与所述第一接入序列做相关, 根据相关后最大 的峰值位置确定所述往返传输时延。
22、 根据权利要求 20所述的基站, 其特征在于,
所述第一确定单元, 具体用于根据终端所在小区的第一个接入序列索引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量的接 入序列中的每一个接入序列分別与所述第一接入序列做相关, 根据相关后的首 径峰值的位置确定所述往返传输时延。
23、 根据权利要求 20~22任意一项所述的基站, 其特征在于, 所述解调单元 包括:
获取模块, 用于获取频率偏移的范围;
分档模块, 用于对所述获取模块获取的频率偏移的范围进行分档; 解调模块, 用于在所述分档模块分档后的频率偏移范围内, 分別解调所述 第一消息。
24、 一种基站, 其特征在于, 包括:
第四发送单元, 用于向终端发送随机接入指示信息, 所述随机接入指示信 息中携带指定的接入序列索引;
第四接收单元, 用于接收终端发送的随机接入信号;
第三获取单元, 用于并从所述第四接收单元接收到的随机接入信号中获取 第二接入序列;
第二确定单元, 用于通过所述第三获取单元获取的第二接入序列确定往返 传输时延;
所述第四发送单元, 还用于向终端发送的已接入物理随机接入信道的指示 信息, 所述已接入的指示信息中携带所述往返传输时延, 使终端根据所述往返 传输时延调整定时提前量, 使所述调整后的定时提前量完全补偿所述往返传输 时延。
25、 根据权利要求 24所述的基站, 其特征在于,
所述第二确定单元, 具体用于根据终端所在小区的第一个接入序列索引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量的接 入序列中的每一个接入序列分別与所述第二接入序列做相关, 根据相关后最大 的峰值位置确定所述往返传输时延。
26、 所述第二确定单元, 具体用于根据终端所在小区的第一个接入序列索 引, 确定终端所在小区使用的规定数量的接入序列, 并用所述确定的规定数量 的接入序列中的每一个接入序列分別与所述第二接入序列做相关, 根据相关后 的首径峰值的位置确定所述往返传输时延。
27、 一种随机接入系统, 其特征在于, 包括终端和基站, 所述终端为上述 权利要求 14~19任意一项所述的终端, 所述基站为上述权利要求 20~26任意一项 所述的基站。
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