WO2009097727A1 - 随机接入信道的zc序列排序方法和装置 - Google Patents
随机接入信道的zc序列排序方法和装置 Download PDFInfo
- Publication number
- WO2009097727A1 WO2009097727A1 PCT/CN2008/073299 CN2008073299W WO2009097727A1 WO 2009097727 A1 WO2009097727 A1 WO 2009097727A1 CN 2008073299 W CN2008073299 W CN 2008073299W WO 2009097727 A1 WO2009097727 A1 WO 2009097727A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sequence
- index
- physical index
- mapping
- logical
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000013507 mapping Methods 0.000 claims abstract description 32
- 230000007423 decrease Effects 0.000 claims abstract description 21
- 230000003247 decreasing effect Effects 0.000 claims 3
- 125000004122 cyclic group Chemical group 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
- H04J13/0062—Zadoff-Chu
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0003—Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
- H04J13/22—Allocation of codes with a zero correlation zone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
Definitions
- a random access channel uses a cyclic shift sequence of a Zadoff-Chu (ZC) sequence as a preamble.
- ZC Zadoff-Chu
- ZCZ Zero Correlation Zones
- the user equipment User Equipment, UE for short
- the example port the mobile phone, the personal digital assistant, etc.
- BCH broadcast channel
- the base station passes the BCH. Notifying the Logical root sequence number of the first ZC sequence that can be used by the RACH of the mobile phone and the step size of the cyclic shift, the mobile phone uses the certain mapping rule to calculate the physicality of the corresponding ZC sequence according to the logical index. The physical root sequence number is then generated according to the cyclic shift step size ( ⁇ in the high-speed environment, but also according to a certain "cyclic shift limit rule") to generate an available ZCZ sequence. If the ZCZ sequence If the number is less than the preset threshold P, the mobile phone automatically increments the sequence logical index, and continues to generate the ZCZ sequence by using the next ZC sequence until the total number of ZCZ sequences is greater than or equal to P.
- the shooting process is the process of reordering the ZC sequence.
- the ZC sequence is generated by the following formula (1), where N is the sequence length, M is the physical index of the sequence, and the physical index of the ZC sequence refers to the generation of each The index used in the ZC sequence, (n) represents the 4 unordered values of the "sample" of the physical index.
- Sequences? I refers to each ZC sequence after sorting the ZC sequences according to a criterion. The number in the queue after sorting. FIG.
- FIG. 1 is a schematic diagram of a frame structure of a Time Division Duplex (TDD) mode in an LTE system.
- TDD Time Division Duplex
- the slots form a subframe of length lms, one radio frame contains 10 subframes (numbered from 0 to 9), and one radio frame contains 20 slots (numbered from 0 to 19).
- a time slot contains seven uplink/downlink symbols of length 66.7us, wherein the first symbol cyclic prefix length is 5.21us.
- the cyclic prefix length of the remaining 6 symbols is 4.69us; for an extended cyclic prefix of length 16.67us, one slot contains 6 up/down symbols.
- subframe 0 and subframe 5 are fixed for downlink transmission; support uplink/downlink conversion with periods of 5 ms and 10 ms; subframe 1 and subframe 6 are The special subframe is used to transmit three special time slots, that is, Downlink Pilot Time Slot (DwPTS for short). Guard Period (GP) and Uplink Pilot (Uplink Pilot) Time Slot, referred to as UpPTS;), where
- DwPTS is used for downlink transmission
- GP is the protection time and does not transmit any data
- the UpPTS is used for uplink transmission, and includes at least two uplink single carrier-frequency division multiple access (SC-FDMA) symbols for transmitting a physical random access channel (Physical Random Access CHannel, referred to as PRACH) 0
- SC-FDMA Physical Random Access CHannel
- PRACH Physical Random Access CHannel
- subframe 2 and subframe 6 are fixed for uplink transmission; in the uplink and downlink handover of 10 ms period, DwPTS exists in two fields, and GP and UpPTS exist in the first field. , the length of DwPTS in the second field is lms, and the length of subframe 2 is ⁇ . Line transmission, subframe 7 to subframe 9 are used for downlink transmission.
- the TDD mode of the LTE system has two types of PRACH.
- the first type is transmitted in non-special uplink subframes (subframes containing special time slots are called special subframes); the second type is transmitted in UpPTS.
- the first type of PRACH is sorted by dividing the sequence into two groups according to the cubic metric with a threshold of 1.2 dB, and then the maximum cyclic shift amount supported by the sequence under the cyclic shift constraint will be The sequence is divided into subgroups, which are then sorted according to the cubic metrics of the sequence within each subgroup.
- Cubic Metric (CM) is a measure of the peak-to-average ratio of transmitted data. The larger the CM is, the higher the peak-to-average ratio is.
- the calculation method is as shown in the following formula (2).
- the second type of PRACH subcarriers are wider, and the anti-multiple-Puller frequency offset is stronger, and the cyclic shift problem is not required to solve the frequency offset problem, so the second type of PRACH cannot be used.
- a sorting method for PRACH is higher.
- W monotonically decreases; below the symmetry axis, the monotony increase of W specifically includes: establishing a mapping between the logical index and the physical index by the function W + 1 modN
- it includes: establishing a mapping between a logical index and a physical index by using the function w 1 mod N
- w is symmetrically mapped up and down and above the axis of symmetry, w monotonically decreases or increases; below the axis of symmetry, ⁇ monotonically increases or decreases.
- the building module establishes a logical index and a physical cable with a function W 1 mod N
- the building module establishes a logical index and physics with a function w mod N
- N 139
- CM value of the sequence approximates the sequence.
- the physical index increases and increases, and when the physical index of the sequence is greater than or equal to
- the ZC sequence sorting method and apparatus provided by the present invention are equivalent to appropriately sorting the ZC sequence according to the CM value, so that the network planner can select the ZC sequence with similar CM values. Allocating to the same cell ensures that the PRACHs of UEs with different sequences in the same area have similar coverage, which solves the lack of ZC sequence ordering in the prior art, and causes UEs using different ZC sequences in the same cell to have Different coverage issues increase the flexibility of cell planning.
- FIG. 1 is a schematic diagram of a frame structure of a TDD mode of an LTE system in the related art
- FIG. 2 is a flowchart of a ZC sequence ordering method according to an embodiment of the present invention
- CM value correspondence N is 139
- Fig. 4 is a block diagram showing a ZC sequence sorting apparatus according to an embodiment of the present invention.
- DETAILED DESCRIPTION OF THE INVENTION The functional phase is based on the fact that when the physical index of the sequence is less than or equal to
- the physical index increases and increases when the physical index of the sequence is greater than or equal to
- the CM value of the sequence is approximately reduced as the physical index of the sequence increases.
- the ZC sequence is properly sorted according to the CM value, and the CM value is obtained.
- the similar ZC sequences are allocated to the same cell, which ensures that the PRACHs of UEs with different sequences in the same area have similar coverage, thereby improving the flexibility of cell planning.
- Step S10 setting ⁇ as a logical index of each ZC sequence, and w is each ZC. a physical index of the sequence, where l ⁇ w ⁇ N - l, 0 ⁇ ⁇ N - 2 , N is the length of each ZC sequence;
- M maps ⁇ symmetrically up and down, and above the axis of symmetry, monotony decreases or increases; below the axis of symmetry, w monotonically increases or decreases.
- ⁇ is the horizontal axis and w is the secondary axis.
- w is above the axis of symmetry, ie "greater than or equal to 1% I; ⁇ below the axis of symmetry, ie less than or equal to
- Figure 3 is the correspondence between the physical index of the sequence and the CM value (N is 139). As shown in Figure 3, when the physical index of the sequence is less than or equal to the value, it increases approximately as the physical index of the sequence increases. , when the physics of the sequence, the CM value of the sequence is similar,
- the sorting method of this embodiment utilizes the properties shown in FIG. 3 above, and the ZC sequence is appropriately sorted according to the CM value, and the ZC sequences with similar CM values are allocated to the same cell, and It is proved that the PRACH of the same mobile phone with different sequences in the same area has similar coverage, thereby improving the flexibility of cell planning.
- the length of the ZC sequence used by N -, ⁇ for the odd machine access channel is 139, and the number of available sequences is 138.
- the mapped w is: 1 138 2 137 3 136 4 135 5... 69 70.
- ⁇ is the odd-number machine access channel used ZC sequence length ⁇ 139, the available sequence number is 138.
- the mapped w is: 69 70 68 71 67 72 66 73 ... 1 138.
- 4 is a side view of a ZC sequence 4 unordered device according to an embodiment of the present invention. As shown in FIG. 4, the method includes: a setting module 10 and an establishing module 20. The two modules are described in detail below.
- the setting module 10 is configured to set ⁇ as a logical index of each ZC sequence, where M is a physical index of each ZC sequence, where l ⁇ u ⁇ N ⁇ l, Q ⁇ c ⁇ N _ 2 , N is each ZC
- the length of the sequence; the establishing module 20 is connected to the setting module 10, and is configured to establish a mapping relationship between the logical index and the physical index according to the logical index and the physical index set by the setting module 10: using ⁇ as the symmetry axis, “up and down symmetry
- the ground maps ⁇ , and above the axis of symmetry, w monotonically decreases or increases; below the axis of symmetry, ⁇ monotonically increases or decreases.
- the setup module 20 establishes a logical index with the function w + 1 mod N
- the setup module 20 establishes a mapping relationship between the logical index and the physical index with the function w 1 mod N .
- JU reflects the mapping relationship of the embodiment shown in FIG. 2, and uses the formula to calculate, so that the mapping table is not saved in the base station and the mobile phone, which saves storage space and reduces design cost. .
- the reason why it is possible to establish a simple calculation formula to establish a mapping relationship is that, in the embodiment of the present invention, it is found that when the physical index of the sequence is less than or equal, the CM value of the sequence increases approximately as the physical index of the sequence increases.
- the CM value of the sequence increases approximately as the physical index of the sequence increases.
- the CM value of the sequence is approximately
- the ZC sequence sorting apparatus performs appropriate sorting of the ZC sequence according to the CM value, and the C ⁇ sequence is reduced according to the increase of the physical index of the sequence.
- the similar ZC sequences are allocated to the same cell, which ensures that the PRACHs of UEs with different sequences in the same area have similar coverage, thereby improving the flexibility of cell planning.
- the sorting result obtained by the sorting method and the device may enable the operator to perform sequence planning and allocation according to the CM characteristics of the sequence, and allocate sequences with similar CM values to the same cell.
- the sequence u and the Nu have exactly the same CM value, so the sorting result obtained by using the method and the apparatus provided by the embodiment of the present invention can assign the sequence u and Nu to the same cell, because the sequence u and Nu are in the sequence structure. There is a symmetrical nature, so the detection complexity of the base station receiver can be reduced.
- the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
- the invention is not limited to any specific combination of hardware and software.
- the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention.
- the present invention can be variously modified and modified. Any modifications, equivalent substitutions, improvements, etc. made therein are intended to be included within the scope of the present invention.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/864,653 US8391229B2 (en) | 2008-01-30 | 2008-12-02 | Method and apparatus for sequencing ZC sequences of a random access channel |
RU2010133955/08A RU2482603C2 (ru) | 2008-01-30 | 2008-12-02 | Способ и устройство для упорядочения последовательностей задова-чу в канале произвольного доступа |
EP08872051.1A EP2239879A4 (en) | 2008-01-30 | 2008-12-02 | METHOD AND APPARATUS FOR ORDERING RANDOM ACCESS CHANNEL SEQUENCE ZC SEQUENCES |
BRPI0821864-1A BRPI0821864B1 (pt) | 2008-01-30 | 2008-12-02 | Um método e dispositivo para sequenciar sequências zc de um canal de acesso aleatório |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200810008443XA CN101227735B (zh) | 2008-01-30 | 2008-01-30 | 随机接入信道的zc序列排序方法和装置 |
CN200810008443.X | 2008-01-30 |
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WO2009097727A1 true WO2009097727A1 (zh) | 2009-08-13 |
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PCT/CN2008/073299 WO2009097727A1 (zh) | 2008-01-30 | 2008-12-02 | 随机接入信道的zc序列排序方法和装置 |
Country Status (6)
Country | Link |
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US (1) | US8391229B2 (zh) |
EP (1) | EP2239879A4 (zh) |
CN (1) | CN101227735B (zh) |
BR (1) | BRPI0821864B1 (zh) |
RU (1) | RU2482603C2 (zh) |
WO (1) | WO2009097727A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Families Citing this family (8)
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CN101179860B (zh) * | 2007-12-05 | 2011-03-16 | 中兴通讯股份有限公司 | 随机接入信道的zc序列排序方法和装置 |
CN101227735B (zh) * | 2008-01-30 | 2012-11-28 | 中兴通讯股份有限公司 | 随机接入信道的zc序列排序方法和装置 |
CN102014442B (zh) * | 2009-09-29 | 2014-01-08 | 电信科学技术研究院 | 发送上行资源调度请求的方法和用户设备 |
CN102136856A (zh) * | 2010-01-21 | 2011-07-27 | 中兴通讯股份有限公司 | 一种确定立方量度和最大回退功率的方法和装置 |
PE20131090A1 (es) | 2010-12-10 | 2013-10-16 | Panasonic Ip Corp America | Metodo y dispositivo de generacion de senales |
BR112016020990B1 (pt) * | 2014-03-25 | 2023-02-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Receptor de preâmbulo, método para receber um sinal de rádio e detectar uma sequência de preâmbulo, e, mídia de armazenamento legível por máquina |
TR201808081T4 (tr) | 2014-03-25 | 2018-07-23 | Ericsson Telefon Ab L M | Geliştirilmiş PRACH başlangıç eki formatı. |
CN109792618B (zh) | 2016-09-22 | 2022-07-29 | 瑞典爱立信有限公司 | 具有定时未对准的有效上行链路测量信号接收和传输窗口分配 |
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CN101090281A (zh) * | 2007-06-19 | 2007-12-19 | 中兴通讯股份有限公司 | 一种上行随机接入前导序列选择方法 |
CN101094529A (zh) * | 2007-08-10 | 2007-12-26 | 中兴通讯股份有限公司 | 随机接入信道的zc序列排序方法及装置 |
CN101227735A (zh) * | 2008-01-30 | 2008-07-23 | 中兴通讯股份有限公司 | 随机接入信道的zc序列排序方法和装置 |
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US8000305B2 (en) * | 2006-01-17 | 2011-08-16 | Motorola Mobility, Inc. | Preamble sequencing for random access channel in a communication system |
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JP4736934B2 (ja) * | 2006-04-28 | 2011-07-27 | 日本電気株式会社 | 無線通信システム、パイロット系列割り当て装置及びそれらに用いるパイロット系列割り当て方法 |
WO2008114967A1 (en) * | 2007-03-16 | 2008-09-25 | Lg Electronics Inc. | Method of generating random access preambles in wireless communication system |
KR100940730B1 (ko) * | 2007-09-07 | 2010-02-04 | 엘지전자 주식회사 | 무선통신 시스템에서 기준 신호 생성 방법 |
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2008
- 2008-01-30 CN CN200810008443XA patent/CN101227735B/zh active Active
- 2008-12-02 EP EP08872051.1A patent/EP2239879A4/en not_active Ceased
- 2008-12-02 RU RU2010133955/08A patent/RU2482603C2/ru active
- 2008-12-02 US US12/864,653 patent/US8391229B2/en active Active
- 2008-12-02 WO PCT/CN2008/073299 patent/WO2009097727A1/zh active Application Filing
- 2008-12-02 BR BRPI0821864-1A patent/BRPI0821864B1/pt active IP Right Grant
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CN101090281A (zh) * | 2007-06-19 | 2007-12-19 | 中兴通讯股份有限公司 | 一种上行随机接入前导序列选择方法 |
CN101094529A (zh) * | 2007-08-10 | 2007-12-26 | 中兴通讯股份有限公司 | 随机接入信道的zc序列排序方法及装置 |
CN101227735A (zh) * | 2008-01-30 | 2008-07-23 | 中兴通讯股份有限公司 | 随机接入信道的zc序列排序方法和装置 |
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Cited By (2)
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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 |
Also Published As
Publication number | Publication date |
---|---|
US8391229B2 (en) | 2013-03-05 |
EP2239879A4 (en) | 2013-09-04 |
RU2482603C2 (ru) | 2013-05-20 |
CN101227735B (zh) | 2012-11-28 |
EP2239879A1 (en) | 2010-10-13 |
RU2010133955A (ru) | 2012-03-10 |
CN101227735A (zh) | 2008-07-23 |
US20100309993A1 (en) | 2010-12-09 |
BRPI0821864A2 (pt) | 2019-02-26 |
BRPI0821864B1 (pt) | 2020-06-16 |
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