WO2013185726A2 - 一种高速移动环境下终端的随机接入方法及随机接入系统 - Google Patents
一种高速移动环境下终端的随机接入方法及随机接入系统 Download PDFInfo
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- WO2013185726A2 WO2013185726A2 PCT/CN2013/081023 CN2013081023W WO2013185726A2 WO 2013185726 A2 WO2013185726 A2 WO 2013185726A2 CN 2013081023 W CN2013081023 W CN 2013081023W WO 2013185726 A2 WO2013185726 A2 WO 2013185726A2
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 164
- 230000006855 networking Effects 0.000 claims description 11
- 238000013507 mapping Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to the field of communications, and in particular, to a random access method and a random access system for a terminal in a high-speed mobile environment.
- the random access technology is an important technology for access control of User Equipment (UE) in the communication system.
- the random access preamble of LTE generally uses the ZC (Zadoff-Chu) sequence, and the random access preamble is based on the ZC sequence by selecting different cyclic shifts.
- the random access subframe consists of three parts, namely CP (Cyclic Prefix), preamble sequence ( Sequence), and GT (Guard Time, guard interval;), as shown in Figure 1.
- the PRACH of the existing LTE system supports five random access preamble formats, namely FormatO to Format4, where FDD (Frequency Division Duplexing) supports formatO to format3, and TDD (Time Division Duplexing) supports formatO to format 4, different random accesses.
- the preamble format corresponds to different CP lengths (TCP), sequence lengths (or the number of samples of the preamble sequence, referred to as TSEQ) and GT length (or the number of guard points, TGT for short).
- TCP CP lengths
- TSEQ sequence lengths
- GT length or the number of guard points
- Format 0 to Format 3 are transmitted in a normal uplink subframe, the length of the ZC sequence (NZC) is 839, Format 4 is transmitted in the UpPTS, and the NZC is 139.
- the value of the cyclic shift amount (NSS) in each random access preamble format is configured, and in the case of Format 0 to Format 3, a cyclic shift amount (NSS) set is configured, which is divided into a restricted set. And non-restricted sets, for Format 0 to Format 3, the value of NCS is shown in Table 2, where 0 in the unrestricted set represents 839.
- the existing LTE system uses a cyclic shift restriction, that is, when the terminal is in a high-speed mobile environment, only the NCS values in the restricted set in Table 2 are allowed to be used.
- the value of NCS in the restricted set is generally small, and the maximum is only 237.
- Such NCS value determines the smaller cell coverage radius. Therefore, the existing random access technology cannot simultaneously satisfy the requirements of high-speed mobile terminal and large cell coverage radius.
- the embodiments of the present invention provide a more random access method and a random access system for a terminal in a high-speed mobile environment, so as to solve the technical problem that a terminal can obtain a large cell coverage radius under high-speed mobility.
- a random access method for a terminal in a high-speed mobile environment comprising: selecting a random access preamble format according to a preset cell coverage radius target value; determining a pre-configured cyclic shift amount under the selected random access preamble format Restricting whether the set satisfies the requirement of the cell coverage radius target value; if not, selecting a cyclic shift amount that satisfies the cell coverage radius target value requirement from a non-limiting set of pre-configured cyclic shift amounts; The cyclic shift amount and the pre-configured mother code generate a random access signal, and the random access signal is used for access.
- the step of selecting a random access preamble format according to the preset cell coverage radius target value includes: calculating, according to the length of the guard interval in the random access subframe in each random access preamble format, the largest cell supported by the corresponding format Coverage radius; select a random access preamble format in which the supported maximum cell coverage radius is greater than or equal to the cell coverage radius target value.
- the step of determining whether the restricted set of the preset cyclic shift amount meets the requirement of the cell coverage radius target value in the selected random access preamble format comprises: according to the cyclic shift in the restricted set The maximum value calculates the maximum cell coverage radius supported by the selected random access preamble format; if the calculated maximum cell coverage radius is smaller than the cell coverage radius target value, the restriction set does not satisfy the cell coverage radius target value Requirements.
- the step of selecting a cyclic shift amount that meets the cell coverage radius target value requirement from the unconstrained set of pre-configured cyclic shift amounts comprises: calculating the selected random connection according to the cell coverage radius target value And a minimum value of the cyclic shift amount that satisfies the requirement of the cell coverage radius target value in the preamble format; and a cyclic shift amount greater than or equal to the minimum value is selected from the unrestricted set.
- the step of selecting a cyclic shift amount that satisfies the cell coverage radius target value requirement from the unconstrained set of pre-configured cyclic shift amounts comprises: preselecting from the non-restricted set to be greater than the limit set At least one cyclic shift amount of the maximum value of the cyclic shift amount; calculating the maximum cell coverage half supported by the selected random access preamble format according to each of the preselected cyclic shift amounts A path is selected from the preselected cyclic shift amount, and the obtained maximum cell coverage radius is greater than or equal to the cyclic shift amount of the cell coverage radius target value.
- the step of configuring the mother code further includes: pre-configuring a mother code table, where the mother code table records required by the cell network a mapping relationship between the number of the mother code, the logical root sequence index group, and the cyclic shift value corresponding to the Doppler shift.
- Each logical root sequence index group includes the same number of mother codes as the cell network. Number of logical root sequence indexes;
- the corresponding mother code is generated according to the selected logical root sequence index.
- a random access system comprising: a base station and a terminal in a high-speed mobile environment, where the base station is configured to select a random access preamble format according to a preset cell coverage radius target value; the terminal is set as a judging station In the random access preamble format, whether the restricted set of the pre-configured cyclic shift amount satisfies the requirement of the cell coverage radius target value; if the cell coverage radius target value requirement is not met, the pre-configured loop is used.
- the base station includes a first calculating module and a first selecting module, where the first calculating module is configured to calculate, according to the length of the guard interval in the random access subframe in each random access preamble format, The maximum cell coverage radius supported by the format; the first comparison module is configured to select a random access preamble format in which the supported maximum cell coverage radius is greater than or equal to the cell coverage radius target value.
- the terminal includes a second computing module and a first determining module, where the second calculating module is configured to calculate a selected random access preamble format according to a maximum value of a cyclic shift amount in the restricted set.
- the maximum cell coverage radius supported by the first determining module is configured to determine that the limit set is not satisfied under the condition that the maximum cell coverage radius calculated by the second calculating module is smaller than the cell coverage radius target value.
- the cell covers the requirement of a radius target value.
- the terminal includes a third calculation module and a second selection module, where the third a calculation module, configured to calculate, according to the cell coverage radius target value, a minimum value of a cyclic shift amount that satisfies a requirement of the cell coverage radius target value in the selected random access preamble format; and the second selection module is set to be A cyclic shift amount greater than or equal to the minimum value is selected in the non-limiting set.
- the terminal includes a third selection module, a fourth calculation module, and a fourth selection module, where the third selection module is configured to pre-select from the non-restricted set that is greater than the limit set. At least one cyclic shift amount of the maximum value of the cyclic shift amount; the fourth calculating module is configured to separately calculate a maximum cell coverage radius supported by the selected random access preamble format according to the pre-selected cyclic shift amounts; The fourth selection module is configured to select, from the pre-selected cyclic shift amount, a cyclic shift amount that the obtained maximum cell coverage radius is greater than or equal to the cell coverage radius target value.
- the base station further includes a mother code table configuration module, a mother code table search module, and a mother code table generation module, where the mother code table configuration module is configured as a pre-configured mother code table, and the mother code table Recording a mapping relationship between the number of the mother code required by the cell network, the logical root sequence index group, and the cyclic shift value corresponding to the Doppler frequency shift, and each logical root sequence index group includes the network networking required by the cell The number of logical root sequences of the same number of mother codes;
- the mother code table searching module is configured to search for a corresponding logical root sequence index group from the mother code table according to the number of mother codes required by the actual cell networking, and select a logical root sequence from the logical root sequence index group.
- the mother code table generating module is configured to generate a corresponding mother code according to the selected logical root sequence index.
- the beneficial effects of the embodiment of the present invention are: when the terminal is in a high-speed mobile environment, if the preset set of the cyclic shift amount is used, the set of the cyclic coverage amount cannot meet the requirement of the cell coverage radius target value in the selected random access preamble format. Then, a cyclic shift amount that satisfies the cell coverage radius target value requirement is selected from a non-limiting set of pre-configured cyclic shift amounts, and a random access signal is generated according to the cyclic shift amount and the pre-configured mother code. In this way, without changing the frame structure and system processing, the high-speed movement of the terminal is satisfied, and a large cell coverage radius can also be obtained.
- 1 is a schematic structural diagram of a random access subframe
- FIG. 2 is a flow chart of a method for random access of a terminal in a high-speed mobile environment according to an embodiment of the present disclosure
- FIG. 3 is a flowchart of a method for random access of a terminal in a high-speed mobile environment according to another embodiment of the present application
- FIG. 4 is a schematic diagram of a random access system according to an embodiment of the present application. Preferred embodiment of the invention
- the terminal when the terminal is in a high-speed mobile environment, if the restricted set of the pre-configured cyclic shift amount cannot meet the requirement of the cell coverage radius target value in the selected random access preamble format,
- the cyclic shift amount that satisfies the requirement of the cell coverage radius target value is selected from the unrestricted set of the configured cyclic shift amount, and the random access signal is generated according to the cyclic shift amount and the pre-configured mother code.
- the embodiment of the present invention first needs to set a cell coverage radius target value and a mother code required for a cell network according to actual conditions.
- the cell coverage radius target value is used to determine the selection of the cyclic shift amount, and the configuration of the mother code required for the cell network is followed.
- the pre-configured limit set of the cyclic shift amount, the unrestricted set includes but is not limited to the table 2, and the limit set shown in Table 2 is the related access.
- the technology is applied to the NCS value in the high-speed mobile environment of the terminal, and the unrestricted set is the NCS value used in the low-speed mobile environment of the terminal in the related access technology.
- S21 to S24 are included:
- the base station selects a random access preamble format according to the preset cell coverage radius target value. 522.
- the terminal determines, according to the selected random access preamble format, whether the preset set of the cyclic shift amount is used to meet the requirement of the cell coverage radius target value; if not, the process proceeds to step S23.
- the terminal selects, from a non-limiting set of pre-configured cyclic shift amounts, a cyclic shift amount that satisfies a requirement of the cell coverage radius target value;
- the terminal generates a random access signal according to the selected cyclic shift amount and the pre-configured mother code, and uses the random access signal to perform access.
- step S22 determines whether the requirement set of the coverage radius target value is met by using the preset set of the cyclic shift amount.
- the terminal selects, from the set of restrictions, a cyclic shift amount that satisfies the target value of the coverage radius of the cell, and then proceeds to step S24.
- Step S23 includes: selecting any cyclic shift amount that satisfies the cell coverage radius target value requirement from the unrestricted set, or selecting a cyclic shift amount that satisfies the cell coverage radius target value requirement and is the smallest from the unrestricted set.
- step S25 includes: selecting, from the set of restrictions, any cyclic shift amount that satisfies the target value of the coverage radius of the cell, or selecting a cyclic shift amount that satisfies the target value of the coverage radius of the cell from the set of limits. .
- the cyclic shift amount determines whether the cell edge user can distinguish different cyclic shift windows, and the cyclic shift amount must be selected to ensure that the preamble sequence and the local sequence correlation peak of the cell edge user fall in the cyclic shift amount.
- NZC is the length of the ZC sequence.
- NZC is 839
- NZC is 139
- TSEQ is the Sequence length (or the number of samples of the preamble sequence).
- TSEQ is 2*24576Ts, which essentially repeats two Preamble blocks.
- TSEQ of Format 0 to Format 3 takes 24576Ts
- TSEQ of Format 4 takes 4096Ts
- NCS is the cyclic shift amount, for any random
- the access preamble format as shown in Table 2, has multiple values and needs to be selected. Therefore, when the random access preamble format is selected, both NZC and TSEQ in Equation 1) are known numbers, only Ncs and cell coverage radius CellRadius1 are unknown, and the cell coverage radius
- CellRadiusl is proportional to the value of Ncs.
- the calculation formula of the cell coverage radius determined by GT can be:
- TGT is the length of the guard interval in the random access subframe (or the number of guard points in the guard interval).
- the value is known.
- Table 1 The value of TGT corresponding to Format 0 is 2976Ts, the value of TGT corresponding to Format 1 is 15840Ts, the value of TGT corresponding to Format 2 is 6048Ts, and the value of TGT corresponding to Format 3 is 21984Ts.
- the value of TGT corresponding to Format 4 is 614Ts. Therefore, according to the TGT corresponding to each random access preamble format, the cell coverage radius CellRadius2 supported by each random access preamble format can be calculated. Therefore, step S21 may specifically be:
- the base station calculates a maximum cell coverage radius supported by the corresponding format according to the length of the guard interval (or the number of sample points of the guard interval) TGT in the random access subframe in each random access preamble format.
- the base station selects a random access preamble format that the supported maximum cell coverage radius is greater than or equal to a preset cell coverage radius target value.
- step S212 can select any of Format 1 and Format 3.
- Equation 1) when the random access preamble format is selected, the NZC in Equation 1)
- TSEQ is a known number, only Ncs and the cell coverage radius CellRadius1 are unknown, and the cell coverage radius CellRadius1 is proportional to the value. Therefore, for the restricted set, if the cell coverage radius CellRadius1 obtained according to the maximum value of the cyclic shift amount (Ncs-Max) in the restricted set cannot reach the preset cell coverage radius target value, then the other in the restricted set Cyclic shift Neither can the cell coverage radius reach the cell coverage radius target value. Therefore, in step S22, it is determined that the implementation method of using the pre-configured cyclic shift amount limit set to meet the cell coverage radius target value requirement in the format selected in step S21 may be:
- the terminal selects Ncs-Max from the restricted set.
- the terminal determines whether the cell coverage radius CellRadius1 obtained in step S222 is smaller than a preset cell coverage radius target value. If the CellRadius1 is smaller than the preset cell coverage radius target value, it indicates that all the cyclic shift amounts in the restriction set cannot be If the cell coverage radius reaches the target, that is, the restriction set does not meet the cell coverage radius target value requirement, the process proceeds to step S23; if the CellRadius1 is not smaller than the preset cell coverage radius target value, it indicates that the cell is still satisfied in the restriction set.
- the loop shift amount required to cover the radius target value, that is, the limit set satisfies the requirement of the cell coverage radius target value proceeds to step S25.
- Step S23 selects from the unrestricted set of pre-configured cyclic shift amounts to satisfy the cell coverage
- One of the ways includes S231 a and S232a:
- the terminal substitutes the cell coverage radius target value, the NZC and the TSEQ corresponding to the random access preamble format selected in step S21 into the formula 1), and calculates the Ncs of the selected random access preamble format that satisfies the target value of the coverage radius of the cell.
- Min minimum cyclic shift amount
- the terminal selects a cyclic shift amount greater than or equal to Ncs-Min from the unrestricted set. Since the cell coverage radius CellRadius1 in Equation 1) is proportional to the value of the cell coverage radius, for any unrestricted set, the cell coverage radius CellRadius1 can be greater than any cyclic shift amount greater than or equal to Ncs-Min. Or equal to the cell coverage radius target value. Another way is to include S231b, S232b, and S233b:
- the terminal preselects a cyclic shift amount larger than the Ncs-Max in the restricted set from the unrestricted set, and the pre-selected cyclic shift amount may be one or more.
- S233b The terminal selects, from the preselected cyclic shift amount, a cyclic shift amount that the obtained maximum cell coverage radius is greater than or equal to the cell coverage radius target value.
- a method for selecting a cyclic shift amount that satisfies the target coverage radius target value from the restricted set may refer to the above steps S231 to S232, or S231b to S233b.
- Step A The terminal pre-configures a mother code table, where the mother code table records the number of mother codes and the logical root sequence index group required for the cell network.
- the mapping relationship between the cyclic shift values corresponding to the Doppler shift As shown in Table 4.
- Step B The terminal searches for a corresponding logical root sequence index group from the mother code table according to the number of mother codes required by the actual cell networking, and selects a logical root sequence index from the logical root sequence index group.
- Step C Terminal The corresponding mother code is generated according to the selected logical root sequence index.
- the number of mother codes in the column is the same, taking the number of mother codes as an example.
- the corresponding logical root sequence index group includes six logical root sequence indexes, which are "22", “23”, “826”, “827”, “830”, "831".
- Table 4 shows only the portion of the total mother code table with a small value of du.
- the system will generate a large frequency offset, and the random access Z-peak will have a fixed offset of du/-du, according to 3GPP.
- the TA (Time Adjustment) estimation deviation can be reduced by selecting the value of the mother code. Since a fixed value is selected when the fixed mother code is selected, before step B, the total mother code table may be traversed to select a portion with a smaller value, and step B may be from a partial mother code having a smaller value. The mother code is selected, so that the high-speed mobile environment of the UE is satisfied without changing the existing frame format and processing mode, the cell coverage radius is expanded, and the TA estimation deviation is reduced.
- a mother code when the UE needs to access, there are the following methods for selecting a mother code, such as: randomly selecting a logical root sequence index from the total mother code table to generate a mother code; or according to actual cell networking requirements
- the number of mother codes find the corresponding logical root sequence index group from the total mother code table, select a logical root sequence index from the logical root sequence index group to generate the mother code; or select the du value from the total mother code table first.
- the small part and randomly selects a logical root sequence index from the partial mother code with a smaller du value to generate a mother code; or, preferably, first selects a part with a smaller du value from the total mother code table, and then according to the actual
- the number of mother codes required for the cell networking is searched for a corresponding logical root sequence index group from a partial mother code having a smaller du value, and a logical root sequence index is selected from the logical root sequence index group to generate a mother code.
- the random access signal is generated according to the cyclic shift amount obtained in step S23 or step S25, and the access is performed.
- the following describes the random access with the cell coverage radius target value of 60 km as an example.
- the random access process is as shown in Figure 3, including:
- the base station randomly accesses the guard interval in the subframe according to Format 0 to Format 4 in Table 1. Degree (or the number of sample points of the guard interval) TGT, calculate the maximum cell coverage radius supported by the corresponding format, or directly check Table 3.
- the base station selects a random access preamble format that supports a maximum cell coverage radius greater than or equal to a preset cell coverage radius target value.
- the system requires the cell coverage radius target value to be 60 km.
- formatl or format3 may be selected here. , first assume that you choose formatl. If Format2 or Format3 is selected, although its TSEQ is 2*24576Ts in Table 1, for Equation 1, the substituted TSEQ is 24576Ts.
- the terminal selects Ncs-Max from the preset set of cyclic shift amounts pre-configured in Table 2. From Table 2, the Ncs-Max in the restricted set is 237, and the NZC corresponding to formatl is 839. The corresponding TSEQ is 24576 Ts.
- the terminal substitutes the Ncs-Max and the NZC and TSEQ corresponding to the formatl into the formula 1) to obtain:
- the Ncs-Min required by the cell coverage radius target value is equal to 419.5 S37a, and the terminal selects a cyclic shift amount greater than or equal to Ncs-Min from the unrestricted set shown in Table 2.
- Query Table 2 shows that only 839 is greater than 419.5. Therefore, the value of the cyclic shift amount is selected to be 839. Since the cell coverage radius CellRadiusl in Equation 1) is proportional to the value of Ncs, cyclic shift When the bit size is 419.5, the obtained cell coverage radius CellRadius1 is equal to the cell coverage radius target value. Therefore, when the cyclic shift amount is 839, the obtained cell coverage radius CellRadius1 must be greater than the cell coverage radius target value.
- the terminal actually needs the number of mother codes for the cell network to be 12, observe Table 4, and randomly select one of the logical root sequence index groups corresponding to the number of mother codes to generate a mother code.
- the terminal generates a random access signal according to the cyclic shift amount determined in step S37 and the mother code generated in step S38, and uses the random access signal to perform access.
- the random access uses the formatl format and the value of the cyclic shift amount is 839.
- the supported cell coverage radius reaches the target coverage radius target value of 60 km or more, and the TA estimation deviation is reduced.
- the logical root sequence index may be randomly selected from the total mother code table or a part of the mother code with a small du value. For example, any one of the logical root sequence index groups corresponding to the number 16 of the mother code is randomly selected. .
- Steps S36a to S37a may be replaced by the following steps S36b to S37b:
- S36b preselecting a cyclic shift amount larger than Ncs-Max in the restricted set from the unrestricted set shown in Table 2, since the Ncs-Max in the restricted set is 237, this step can be from the unrestricted shown in Table 2.
- the pre-selected amount of cyclic shift in the set is 279, 419, and 839.
- the cell coverage radius CellRadius1 in Equation 1) is proportional to the value of the cell, the non-limiting set, after only the cyclic shift amount greater than 237 is substituted into the formula 1), it is possible to obtain a cell coverage radius target value greater than or equal to The cell coverage radius CellRadiusl.
- the maximum cell coverage radius supported by formatl which is determined by the amount of cyclic shift, is approximately 39 km.
- the maximum cell coverage radius supported by formatl which is determined by the amount of cyclic shift, is approximately 59 km.
- the maximum cell coverage radius supported by formatl determined by the amount of cyclic shift is approximately
- the obtained maximum cell coverage radius is greater than or equal to the cyclic shift amount of the cell coverage radius target value.
- the embodiment of the present invention further provides a random access system.
- the random access system includes: a base station 41 and a terminal 42 in a high-speed mobile environment, where the base station 41 is configured to The cell coverage radius target value is selected to select a random access preamble format; the terminal 42 is configured to determine, according to the selected random access preamble format, whether the restricted set of the pre-configured cyclic shift amount satisfies the requirement of the cell coverage radius target value.
- the base station 41 may include a first calculation module 411 and a first selection module 412, where the first calculation module 411 is configured to calculate the corresponding format according to the length of the guard interval in the random access subframe in each random access preamble format.
- the maximum cell coverage radius; the first comparison module 412 is configured to select a random access preamble format in which the supported maximum cell coverage radius is greater than or equal to the cell coverage radius target value.
- the base station 41 may further include a mother code table configuration module 413, a mother code table search module 414, and a mother code table generation module 415.
- the mother code table configuration module 413 is configured to pre-configure a mother code table, and the mother code table records the cell.
- the mapping relationship between the number of mother codes required by the networking, the logical root sequence index group, and the cyclic shift value corresponding to the Doppler shift, and each logical root sequence index group includes and
- the number of mother codes required by the cell networking is the same number of logical root sequence indexes; the mother code table search module
- the mother code table generating module 415 configured to generate a corresponding mother code according to the selected logical root sequence index.
- the terminal 42 may include a second calculating module 421 and a first determining module 422, where the second calculating module 421 is configured to calculate a maximum cell supported by the selected random access preamble format according to a maximum value of the cyclic shift amount in the restricted set.
- the first determining module 422 is configured to determine that the restricted set does not satisfy the cell coverage radius target value, if the maximum cell coverage radius calculated by the second calculating module 421 is smaller than the cell coverage radius target value. Requirements.
- the terminal 42 may further include a third calculating module 423 and a second selecting module 424, where the third calculating module 423 is configured to calculate, according to the cell coverage radius target value, that the cell coverage is satisfied in the selected random access preamble format.
- the terminal 42 may further include a third selection module, a fourth calculation module, and a fourth selection module, where the third selection module is configured to pre-select from the non-restricted set to be greater than a cyclic shift in the restricted set At least one cyclic shift amount of the maximum value; a fourth calculating module, configured to separately calculate a maximum cell coverage radius supported by the selected random access preamble format according to the pre-selected cyclic shift amounts; fourth selecting module, setting In order to select from the pre-selected cyclic shift amounts, the obtained maximum cell coverage radius is greater than or equal to the cyclic shift amount of the cell coverage radius target value.
- the third selection module is configured to pre-select from the non-restricted set to be greater than a cyclic shift in the restricted set At least one cyclic shift amount of the maximum value
- a fourth calculating module configured to separately calculate a maximum cell coverage radius supported by the selected random access preamble format according to the pre-selected cyclic shift amounts
- the terminal 42 may further include a random access signal generating module 425 and a random access module 426, and the random access signal generating module 425 is configured to generate random access according to the cyclic shift amount selected by the terminal 42 and the mother code pre-configured by the base station.
- the signal, random access module 426 is configured to access using the random access signal.
- the beneficial effects of the embodiments of the present invention are: when the terminal is in a high-speed mobile environment, if the preset set of cyclic shift amount is used, the cell coverage radius target value cannot be satisfied in the selected random access preamble format. a request, selecting, from a non-limiting set of pre-configured cyclic shift amounts, a cyclic shift amount that satisfies a requirement of the cell coverage radius target value, and performing random access signals according to the cyclic shift amount and the pre-configured mother code generate. In this way, without changing the frame structure and system processing, the high-speed movement of the terminal is satisfied, and a large cell coverage radius can also be obtained.
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US14/350,378 US9622268B2 (en) | 2012-08-29 | 2013-08-07 | Random access method and random access system for terminal in high-speed mobile environment |
AU2013275770A AU2013275770B2 (en) | 2012-08-29 | 2013-08-07 | Random access method and random access system for terminal in high-speed mobile environment |
RU2014114374/07A RU2572585C1 (ru) | 2012-08-29 | 2013-08-07 | Способ и система произвольного доступа для терминала в среде связи с высокоскоростными подвижными объектами |
EP13803583.7A EP2750471B1 (en) | 2012-08-29 | 2013-08-07 | Random access method and random access system for terminal in high-speed mobile environment |
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RU2673680C1 (ru) * | 2017-10-16 | 2018-11-29 | Акционерное общество "Научно-производственное предприятие "Полет" | Система радиосвязи с подвижными объектами |
RU2727155C1 (ru) * | 2017-03-20 | 2020-07-21 | ЭлДжи ЭЛЕКТРОНИКС ИНК. | Способ и пользовательское оборудование для передачи преамбулы произвольного доступа, способ и базовая станция для приема преамбулы произвольного доступа |
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CN106162921A (zh) * | 2015-04-10 | 2016-11-23 | 中兴通讯股份有限公司 | 一种随机接入的方法、节点以及系统 |
CN109845378B (zh) * | 2016-09-28 | 2023-10-10 | 索尼公司 | 下一代无线系统中的随机接入 |
CN115720380B (zh) * | 2016-09-29 | 2023-08-22 | 华为技术有限公司 | 一种随机接入前导序列的生成方法及用户设备 |
KR102239615B1 (ko) | 2016-10-26 | 2021-04-12 | 후아웨이 테크놀러지 컴퍼니 리미티드 | 랜덤 액세스 프리앰블 시퀀스 송신 방법, 장치 및 시스템 |
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CN109510693B (zh) * | 2017-09-11 | 2020-11-24 | 电信科学技术研究院 | 一种生成前导码序列的方法、基站及终端 |
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RU2727155C1 (ru) * | 2017-03-20 | 2020-07-21 | ЭлДжи ЭЛЕКТРОНИКС ИНК. | Способ и пользовательское оборудование для передачи преамбулы произвольного доступа, способ и базовая станция для приема преамбулы произвольного доступа |
US11184210B2 (en) | 2017-03-20 | 2021-11-23 | Lg Electronics Inc. | Method and user equipment for transmitting random access preamble, and method and base station for receiving random access preamble |
RU2673680C1 (ru) * | 2017-10-16 | 2018-11-29 | Акционерное общество "Научно-производственное предприятие "Полет" | Система радиосвязи с подвижными объектами |
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CN103634926B (zh) | 2016-09-07 |
EP2750471B1 (en) | 2018-02-28 |
CN103634926A (zh) | 2014-03-12 |
RU2572585C1 (ru) | 2016-01-20 |
US20150163829A1 (en) | 2015-06-11 |
US9622268B2 (en) | 2017-04-11 |
AU2013275770A1 (en) | 2014-05-01 |
WO2013185726A3 (zh) | 2014-02-06 |
EP2750471A2 (en) | 2014-07-02 |
EP2750471A4 (en) | 2016-02-24 |
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