LTE系统中保证CCE分配公平性的算法

doi:10.3969/j.issn.1000-0801.2011.9.022

Abstract

Abstract:

In LTE system，CCE（control channel element）is physical resource which transmits control information，it is used by uplink and downlink schedulers. If uplink schedule faster than downlink and it needs much CCE，then there is no or litter CCE providing to downlink，it must lead that resource blocks in PDSCH are wasted too many，whereas it also exists in PUSCH. To avoid this problem，a way is adopted to guarantee that CCE can be allocated impartially between uplink and downlink scheduler by restricting the maximum UE number which allocated in schedulers. It also provides the algorithm of calculating the maximum UE number to allocate CCE in uplink and downlink scheduler. The method is feasible via testified in an emulator.

Key words: LTE, schedule, CCE allocation, impartiality

Hong Tang,Gang Shu,Linjun Zhao,Zhiling Yan. The Algorithm of Guarantee CCE Allocated Impartially in LTE System[J]. Telecommunications Science, 2011, 27(9): 83-88.

	起始位置S_k（L）		PDCCH 候选数M^（L）	位置	传输内容
类型	聚集级别L	大小（CCE）	PDCCH 候选数M^（L）	位置	传输内容
UE-specific	16		6	common以外的CCE	上下行调度结果中关于 RB 的指示
	212		6		信息和调制编码方式等
	4 8 816		22
common	416		4	前16个CCE	MSG2、MSG4^[5]、SIB^[6]、PCCH、DCI 格
	816		2		式3和3A

变量名	含义
ul_max	上行调度中可以分配CCE的最大UE数
dl_max	下行调度中可以分配CCE的最大UE数
dl	下行希望被调度的UE数目
ul	上行希望被调度的UE数目
CCE_NUM	当前可分配的CCE的数目
all_cce	调度结束已被使用的CCE数目
dl_ue	调度结束后下行成功分配过CCE的UE数
ul_ue	调度结束后上行成功分配过CCE的UE数
dl_CQI	UE的下行信道质量指示
ul_CQI	UE的上行信道质量指示
dl_aυer	下行平均信道质量
ul_aυer	上行平均信道质量
all_aυer	上下行总的平均信道质量
pdcch_num	当前情况下小区内可以将CCE 按all_aυer 分成的PDCCH数目

数据组号	有无使用算法	dl_aυer	ul_aυer	dl_max	ul_max	dl_ue	ul_ue	all_cce	CCE利用率
1	未使用	0.00	0.00	100	100	19	10	82	0.943
	使用	8.12	7.96	14	100	14	14	79	0.908
2	未使用	0.00	0.00	100	100	22	9	85	0.977
	使用	8.46	7.78	14	100	14	14	77	0.885
3	未使用	0.00	0.00	100	100	20	8	86	0.989
	使用	8.00	8.45	13	100	13	13	83	0.954
4	未使用	0.00	0.00	100	100	22	9	85	0.977
	使用	8.03	8.28	13	100	13	16	84	0.966
5	未使用	0.00	0.00	100	100	22	6	83	0.954
	使用	8.53	7.63	14	100	14	11	81	0.931
6	未使用	0.00	0.00	100	100	23	4	83	0.954
	使用	8.30	7.90	14	100	14	15	82	0.943
7	未使用	0.00	0.00	100	100	26	4	81	0.931
	使用	7.99	8.40	13	100	13	10	82	0.943
8	未使用	0.00	0.00	100	100	21	7	81	0.931
	使用	8.47	7.91	14	100	14	12	76	0.874
9	未使用	0.00	0.00	100	100	21	8	84	0.966
	使用	9.39	7.11	15	100	15	14	84	0.966
10	未使用	0.00	0.00	100	100	19	3	81	0.931
	使用	8.63	7.61	13	100	13	8	79	0.908

[1]	赵训威，林辉，张明 . 3GPP 长期演进（LTE）系统架构与技术规范. 北京: 人民邮电出版社， 2010
[2]	3GPP TS 36.212 V8.8.0. Multiplexing and channel coding， Dec 2009
[3]	3GPP TS 36.211 V8.9.0. Physical channels and modulation， Dec 2009
[4]	3GPP TS 36.213 V8.9.0. Physical layer procedures， Sep 2009
[5]	3GPP TS 36.321 V8.9.0. Medium access control（MAC）protocol specification， Jun 2010
[6]	3GPP TS 36.331 V8.12.0. Radio resource control（RRC）protocol specification， Dec 2010

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The Algorithm of Guarantee CCE Allocated Impartially in LTE System

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