关于低轨卫星通信的分析及我国的发展建议

doi:10.11959/j.issn.1000-0801.2020181

Abstract

Abstract:

The review on the development in 5G and LEO satellite communications was given on multi aspects.The role of LEO satellite communication in 5G was positioned as a complement,not yet as the main role.The proposals were thus given based on the analysis of the application requirements,technologies and the industrial level regarding to the LEO satellite communication R＆amp;D in China.Suggestions for the development of LEO satellite communication in China as:“compatible with 5G,integrated within 6G” were put forward.The development process could be divided into two steps.In the first step,the current LEO satellite communication system could be developed mostly based on the 5G technologies and compatibility,the maximumly reuse of 5G key technologies,the cost reduction from the scale economy effect of 5G,and finally the LEO advantages achieved from the differentiation between 5G and LEO.In the second step,the terrestrial mobile communication and the high,medium and low orbit satellite communications would be harmony integrated in 6G.The final suggestions were of two efforts and two cooperations:encouraging application and getting more frequency resources and satellite orbit resources,the international cooperation and the domestic cooperation,to accelerate the industrial maturity and to achieve commercial success.

Key words: LEO satellite communication, satellite internet, 5G, 6G, compatibility with 5G, integration within 6G, economics of scale

CLC Number:

TN927.2

Shanzhi CHEN. Analysis of LEO satellite communication and suggestions for its development strategy in China[J]. Telecommunications Science, 2020, 36(6): 1-13.

Figures/Tables 5

物理层		DVB-S2/S2X	基于5G的低轨卫星	备注说明
物理层	多址方式	前向TDM，反向（回传交互）	OFDMA 或SC-FDMA	5G更灵活
		MF-TDMA
	调制方式	QPSK、8PSK、16APSK、32APSK	可以重用	无差别
	信道编码	“LDPC+BCH”	LDPC	基本接近
	多普勒补偿	基于星历预补偿	可以重用	无差别
	定时同步机制	单向同步	双向同步	DVB 无法保证时延
	下行同步信号	有流同步信号	支持小区级/波束级的时频同步	5G更灵活
	上行随机接入信道	不支持，在网络层接入	支持动态随遇接入，基于不同终	5G更灵活
			端类型多种接入信道格式
	参考信号	每16时隙36个导频符号	可以动态配置导频符号密度	5G更灵活
	信道质量指示（CQI）反馈	在回传信道中支持慢速 CQI 反	每时隙快速CQI反馈	5G更灵活
		馈
	自适应调制编码（AMC）	在每个帧中可以调整传输参数	每时隙每用户独立AMC调整	5G更灵活
	资源分配颗粒度	最短时隙90个符号，但终端需要检测完所有数据信号，才能识别该用户的数据分组	最小颗粒度：时域 1 个符号，频域12个子载波；在物理层就可区分每个用户的独立信号	5G更灵活
	波束管理	慢速的波束调整	基于用户的需求动态调整每时隙波束	5G更灵活
	混合式自动重传请求（HARQ）	无	支持	DVB功能缺失
	上行控制信道	无	支持物理层ACK、SR快速上报	DVB功能缺失
媒体接入控制层	调度功能	预先分配	动态调度：每个时隙独立分配资源和配置传输参数；预授权业务：可以预先分配资源和配置传输参数，支持SPS调度；支持上行调度请求SR和资源请求BSR	5G更灵活
	载波管理	静态分配多载波	MAC层动态载波激活和释放，支持部分带宽BWP功能	5G更灵活
	随机接入	可以支持随机用户接入	支持竞争性和非竞争性接入；支持4步接入和2步接入	5G更灵活
	混合式自动重传请求（HARQ）	无	支持动态HARQ关闭和开启	DVB功能缺失
	非连续接收（DRX）	无	支持长 DRX 和短 DRX，终端可以省电	DVB功能缺失
无线资源管理（RRM）层	用户连接状态管理	没有基于业务属性的用户区分，只有一种状态，网络管理用户容量有限	基于业务特性，区分3种RRC状态：RRC-connected、RRC-inactive、RRC-idle	5G更灵活
	RRM测量	不支持	通过 RRM 测量支持小区切换和波束切换	DVB功能缺失
	移动性管理	不支持	具有丰富而灵活的移动性管理功能，支持基于用户位置的寻呼和小区切换	DVB功能缺失
	接入网广播消息	不支持	对频率、波束、带宽可以广播通知	DVB功能缺失

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Analysis of LEO satellite communication and suggestions for its development strategy in China

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