LTE PRACH参数配置分析
LTE PRACH参数配置分析
目录
目录................................................................................................................................................... 1 1
引言 ........................................................................................................................................... 2 1.1 1.2 1.3 1.4 1.5 2
编写目的 ........................................................................................................................... 2 文档组织 ........................................................................................................................... 2 预期读者和阅读建议 ....................................................................................................... 2 参考资料 ........................................................................................................................... 2 缩写术语和常用符号 ....................................................................................................... 2
PRACH信道的配置分析........................................................................................................ 3 2.1 PRACH信道的配置参数 ................................................................................................ 3 2.1.1 PRACH配置索引（prach-ConfigurationIndex） ................................................... 3 2.1.2 零相关配置（zeroCorrelationZoneConfig） ......................................................... 11 2.1.3 根序列索引（rootSequenceIndex） ...................................................................... 15 2.1.4 是否为高速状态（highSpeedFlag） ..................................................................... 18 2.1.5 频率偏移（prach-FrequencyOffset） .................................................................... 19 2.2 PRACH信道的参数的配置方法................................................................................... 19 2.2.1 PRACH信道参数的配置步骤 ............................................................................... 19 2.2.2 邻小区的PRACH信道的配置 .............................................................................. 20
3 LTE典型 PRACH配置 ....................................................................................................... 21 3.1 FORMAT 0时 PRACH信道的参数的配置 .................................................................... 21 3.1.1 密度为1情况下PRACH相关参数配置 .............................................................. 21 3.1.2 密度为2情况下PRACH相关参数配置 .............................................................. 22 3.2 FORMAT 4时 PRACH信道的参数的配置 .................................................................... 24
4 5
高速模式下配置原则 ............................................................................................................. 25 附录 ......................................................................................................................................... 28 5.1
南京规模实验网站址分布图 ......................................................................................... 28
第 1 页
LTE PRACH参数配置分析
1 引言
1.1 编写目的
本文档的编写目的是分析PRACH信道的各参数的配置方法及各邻区间如何进行配置。
1.2 文档组织
本文首先对LTE3.0版本需要配置的PRACH信道的各参数进行了说明和描述，根据网络规划如何确定各参数的取值，并给出相邻小区各参数的配置原则。本文在第2章的后半部分给出了PRACH各参数的配置方法和步骤。第3章给出了高速模式下的零相关和根序列的配置有一定的关联关系。
1.3 预期读者和阅读建议
本文档的预期读者为LTE网络建设人员和LTE网络优化人员、测试人员等。
1.4 参考资料
1. 《LTE无线配置参数分析.doc 》 V1.1 2. 《LTE PRACH密度需求分析.doc》V1.0
3. 《LTE——UMTS长期演进理论与实践》马霓、邬钢等译 4. 3GPP TS 36.211 Physical Channels and Modulation
1.5 缩写术语和常用符号
英文缩写 CM PAPR PRACH RACH
第 2 页
Cubic Metric Peak-to-Average Power Ratio Physical Random Access Channel Random Access Channel 英文全称 中文全称 立方量度 峰均值功率比 物理随机接入信道 随机接入信道 LTE PRACH参数配置分析
2 PRACH信道的配置分析
2.1 PRACH信道的配置参数
LTE 中PRACH信道的配置参数主要有五个，都是小区级参数分别是： ? PRACH配置索引（prach-ConfigurationIndex） ? 零相关配置（zeroCorrelationZoneConfig） ? 根序列索引（rootSequenceIndex） ? 是否为高速状态（highSpeedFlag） ? 频率偏移（prach-FrequencyOffset）
2.1.1 PRACH配置索引（prach-ConfigurationIndex）
2.1.1.1 参数基本信息
参数编号 取值范围 0..63 默认值：51 参数名称 prach-ConfigurationIndex 传送途径 eNodeB->UE 所属网元及设置途径 小区逻辑无线资源参数->物理随机接入信道-> PRACH配置索引 不同场景下的差异化配置说明 无 无 作用范围 Cell 无 参数出处 36.211 物理单位 调整步长
用于指示小区的PRACH配置索引。该参数指示了PRACH的频域资源索引、时域的无线帧、半帧、子帧的资源占用情况。该参数确定后，小区PRACH的时、频资源即可确定，同时也确定了采用的前导格式（0~47为前导格式0~3，47~57为前导格式4），其定义见下表（36.211 Table 5.7.1-4）。
第 3 页
LTE PRACH参数配置分析
PRACH
configuration Index (See Table 5.7.1-3)
0 1 2 3 4 5 6
7 8 9 10 11 12
UL/DL configuration (See Table 4.2-2)
2 3 4
(0,1,0,0) (0,2,0,0) (0,1,1,0) (0,0,0,0) (0,0,1,0) N/A (0,0,0,0) (0,0,1,0) N/A N/A
(0,1,0,2) (0,2,0,2) (0,1,0,1) (0,0,0,2) (0,0,0,1) (0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,0,0) (0,0,0,2) (0,0,0,0) (0,0,0,1) (0,0,0,0) (0,0,0,1) (0,0,0,2) N/A N/A (0,0,0,0) (0,0,0,1) (0,0,0,2) (1,0,0,2) (0,0,0,0) (0,0,0,1) (0,0,0,2) (1,0,0,1) (0,0,0,0) (0,0,0,1) (0,0,0,2) (1,0,0,0) (0,0,0,0) (0,0,0,1) (0,0,0,2) (1,0,0,1) (1,0,0,2) (0,0,0,0) (0,0,0,1) (0,0,0,2) (1,0,0,0) (1,0,0,2) (0,0,0,0) (0,0,0,1) (0,0,0,2) (1,0,0,0) (1,0,0,1) (0,0,0,0) (0,0,0,1) (0,0,0,2) (1,0,0,0) (1,0,0,1) (1,0,0,2) N/A
(0,1,0,1) (0,2,0,1) (0,1,0,0) (0,0,0,1) (0,0,0,0) N/A (0,0,0,0) (0,0,0,1) N/A N/A
0 (0,1,0,2) (0,2,0,2) (0,1,1,2) (0,0,0,2) (0,0,1,2) (0,0,0,1) (0,0,0,2) (0,0,1,2) (0,0,0,1) (0,0,1,1) (0,0,0,0) (0,0,1,0) (0,0,0,1) (0,0,0,2) (0,0,1,2) (0,0,0,0) (0,0,1,0) (0,0,1,1) N/A (0,0,0,1) (0,0,0,2) (0,0,1,1) (0,0,1,2) (0,0,0,0) (0,0,0,2) (0,0,1,0) (0,0,1,2) (0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,1,1) (0,0,1,2) (0,0,0,1) (0,0,0,2) (0,0,1,0) (0,0,1,1) (0,0,1,2) (0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,1,0) (0,0,1,2) (0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,1,0) (0,0,1,1) (0,0,1,2) N/A
1 5 6 (0,1,0,2) (0,2,0,2) (0,1,1,1) (0,0,0,2) (0,0,1,1) (0,0,0,1) (0,0,0,2) (0,0,1,1) (0,0,0,1) (0,0,1,0) (0,0,0,0) (0,0,1,1) (0,0,0,1) (0,0,0,2) (0,0,1,1) (0,0,0,0) (0,0,0,2) (0,0,1,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (0,0,0,1) (0,0,0,2) (0,0,1,0) (0,0,1,1) (0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,1,1) (0,0,0,0) (0,0,0,2) (0,0,1,0) (0,0,1,1) (0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,1,0) (0,0,1,1) N/A
(0,1,0,1) (0,2,0,1) (0,1,1,1) (0,0,0,1) (0,0,1,1) (0,0,0,0) (0,0,0,1) (0,0,1,1) (0,0,0,0) (0,0,1,0) N/A
(0,1,0,0) (0,2,0,0) N/A (0,0,0,0) N/A N/A (0,0,0,0) (1,0,0,0) N/A N/A
13
(0,0,0,0) (0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (1,0,0,0) (0,0,0,1) (0,0,0,0) (0,0,1,0) (0,0,1,0) (0,0,1,1) (1,0,1,0) (0,0,0,0) N/A (0,0,0,1) (0,0,1,0)
(0,0,0,0) (0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,0) (1,0,0,0) (0,0,1,1) (1,0,1,0) N/A N/A
(0,0,0,0) (0,0,0,0)
(0,0,0,1) (1,0,0,0) (1,0,0,1) (2,0,0,0) (0,0,0,0) N/A (0,0,0,1) (1,0,0,0) N/A N/A (0,0,0,0) (0,0,0,1) (1,0,0,0) (1,0,0,1) N/A
(0,0,0,0) (1,0,0,0) (2,0,0,0) (3,0,0,0) N/A
14 N/A N/A N/A N/A
15
16
17
18
19
20 / 30 21 / 31 22 / 32 23 / 33 (0,1,0,1) (0,2,0,1) (0,1,1,1) (0,0,0,1)
(0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (1,0,0,1) (0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (1,0,1,1) (0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (1,0,0,0) (0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (1,0,0,1) (1,0,1,1) (0,0,0,0) (0,0,0,1) (0,0,1,0) (0,0,1,1) (1,0,0,0) (1,0,1,0) (0,1,0,0) (0,2,0,0) (0,1,1,0) (0,0,0,0)
(0,0,0,0) (0,0,1,0) (1,0,0,0) (1,0,1,0) (2,0,0,0) (0,0,0,0) (0,0,1,0) (1,0,0,0) (1,0,1,0) (2,0,1,0) N/A (0,0,0,0) (0,0,0,1) (1,0,0,0) (1,0,0,1) (2,0,0,1) (0,0,0,0) (0,0,0,1) (1,0,0,0) (1,0,0,1) (2,0,0,0) N/A
(0,0,0,0) (1,0,0,0) (2,0,0,0) (3,0,0,0) (4,0,0,0) N/A
N/A N/A
(0,0,0,0) (0,0,1,0) (1,0,0,0) (1,0,1,0) (2,0,0,0) (2,0,1,0) N/A (0,0,0,0) (0,0,0,1) (1,0,0,0) (1,0,0,1) (2,0,0,0) (2,0,0,1) N/A (0,0,0,0) (1,0,0,0) (2,0,0,0) (3,0,0,0) (4,0,0,0) (5,0,0,0) N/A
N/A N/A N/A N/A (0,1,0,1) (0,2,0,1) N/A (0,0,0,1) (0,1,0,0) (0,2,0,0) N/A (0,0,0,0) N/A N/A N/A N/A
(0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,1,0) (0,0,1,1) (1,0,0,2) (0,0,0,0) (0,0,0,1) (0,0,0,2) (0,0,1,0) (0,0,1,1) (1,0,1,1) (0,1,0,1) (0,2,0,1) (0,1,1,0) (0,0,0,1)
第 4 页