LTE FDD与TD-LTE海域覆盖对比测试

doi:10.11959/j.issn.1000-0801.2015372

Abstract

Abstract:

With the development of national economy,marine fishery and marine tourism grow rapidly.The demand for data communication in sea area is increasing in recent years.It is an opportunity for mobile operators to build a high quality sea area coverage network,so as to develop market and enhance brand competitiveness.According to the on-site test results and the configuration parameters,together with the technical features of LTE FDD and TD-LTE,the coverage capability of LTE FDD and TD-LTE in sea area was analyzed.The analysis of the test results may also provide guidance for LTE network planning and design in sea area.

Key words: LTE FDD, TD-LTE, sea area coverage, test

Li YU,Xusong ZHAO,Xugang ZHENG,Weiming YE,Zhenzhe WU. LTE FDD and TD-LTE sea area coverage test[J]. Telecommunications Science, 2015, 31(Z1): 53-57.

特殊子帧配置	常规CP				扩展CP
特殊子帧配置	DwPTS	GP	UpPTS	覆盖距离/km	DwPTS	GP	UpPTS	覆盖距离/km
0	3	10	1	107.14	3	8	1	100
1	9	4	1	42.86	8	3	1	37.5
2	10	3	1	32.14	9	2	1	25
3	11	2	1	21.43	10	1	1	12.5
4	12	1	1	10.71	3	7	1	87.5
5	3	9	2	96.43	8	2	2	25
6	9	3	2	32.14	9	1	2	12.5
7	10	2	2	21.43	-	-	-	-
8	11	1	2	10.71	-	-	-	-

前导格式	时间长度/ms	CP/Ts	Pre/Ts	GT/μs	支持半径/km
0	1	3 168	24 576	96.875	14.53
1	2	21 024	24 576	515.625	77.34
2	2	6 240	2×24 576	196.875	29.53
3	3	21 024	2×24 576	715.625	107.34
4	0.157	448	4 096	9.375	1.41

TDD1 900 MHz参数配置	TDD1 900 MHz参数配置		FDD1 800 MHz参数配置		FDD900 MHz参数配置
双工模式	TDD		FDD		FDD
RRU型号	3168		3936		3936
上下行子帧配比	2:2		/		/
特殊子帧配比	3:9:2		/		/
带宽/MHz	20		10		5
UL/DL	UL	DL	UL	DL	UL	DL
设备	UE	eNode B	UE	eNode B	UE	eNode B
最大发射功率/dBm	23	51	23	51	23	51
天线挂高	5	286	5	286	5	286
天线增益/dBi	0	15	0	18.5	0	16.5
频率/MHz	1 890	1 890	1 715	1 830	909	954
MIMO模式	1×8	8×2 BF	1×4	2×2	1×4	2×2

影响因素	TD-LTE	LTE FDD	说明
站高/m	286	286	站的高度越高覆盖距离越远
终端高度/m	5	5	影响上行接入距离
基站功率/dBm	51	51	下行功率影响下行的覆盖距离
天线/dBi	15	18.5&16.5	天线增益影响覆盖距离
馈线	0.5 dB馈损	0.5 dB馈损	建议RRU近塔安装，减少馈损，提升上下行覆盖，必要时可增加塔放
频率选择/MHz	1 890	UL:1 715&909 DL:1 810&954	低频段频率特性较好可以覆盖更远的距离
MIMO模式	UL:1×8/DL:8×2BF	UL:1×4/DL:2×2	上行受限，8R可以带来上行分集增益
干扰	存在干扰	存在干扰	海面场景，干扰对覆盖影响会非常明显，建议通过清频及合理的组网来达到减少干扰的目的
终端	MIFI	MIFI	海面覆盖建议采用更大功率、更高灵敏度的终端，优选CPE
地球曲率	限制条件相同，本次测试TDD下行受到模型B段影响	限制条件相同，FDD上下行受到模型限制	受地球曲率影响，基站高度和终端高度决定了终端侧能收到LOS信号的距离
特殊子帧保护间隔 GP	3:9:2	不涉及	上下行保护间隔GP会影响小区覆盖半径，在3:9:2的特殊时隙配比下，半径在100 km左右受限
preach格式	前导格式1	前导格式3	TDD前导格式1支持的最大覆盖半径为77 km左右受限
BF增益	TM8	不涉及	TDD下行8天线BF可以带来较大增益

测试频段	下行2 Mbit/s测试点	上行256 kbit/s测试点	下行掉话测试点	上行接入测试点
TDD 1900 MHz	75.58	57.74	79.41	77.34
FDD 1800 MHz	81.3	76.4	82.1	81.6
FDD 900 MHz	85.2	79.4	89.4	86.3

LTE FDD and TD-LTE sea area coverage test

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测试点	频段/MHz	RSRP/dBm	SINR/dB	RSSI/dBm	距离/km
掉话测试点	1 800	-130.63	-6	-96.63	84.13
	900	-128.38	-9	-92.50	82.57
接入测试点	1 800	-128.88	-5	-96.38	80.13
	900	-125	-9	-91	80.76
下行2 Mbit/s测试点	1 800	-124	-1	-94	80.68
	900	-118	-4	-88.63	80.23
上行256 kbit/s测试点	1 800	-117	1	-89.63	79.75
	900	-115	-2	-88.5	78.74

测试内容	RSRP/dBm	SINR/dB	RSSI/dBm	拉远距离/km
掉话测试点	-129.38	-8	-90.13	75.1
接入测试点	-129.88	-7	-92.88	69.5
下行2 Mbit/s测试点	-113.23	2	-82.38	68.2
上行256 kbit/s测试点	-111	11	-84.25	59.8

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