无线资源管理及参数2
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Intra-frequency & Interfrequency & GERAN & UMTS measurements
Intra-frequency & Interfrequency & GERAN measurements
Intra-frequency & Interfrequency measurements
iniPrbsUl 上行链路初始分配的PRB数目 默认值10个
TD-LTE调度 (以下行为例)
步骤1:分析可用于PDSCH信道的物理资源
除去广播 信道、公共控制信道所占资源
步骤2:分析有效的UEs
1. eNB中有该UE缓存的数据 2. 有该UE上报的有效的CQI 3. UE不在DTX/DRX 4. UE不在measurement Gap 符合以上条件的UE进入candidate
p0NomPusch:Nominal Power for UE PUSCH Tx Power Calculation。范围:-126..24dbm; 1; -106
dBm
ulpcAlpha:范围 0.4..1.0,上行路损的补偿因子
[ ] PPUCCH (i) = min{ PMAX , P0_PUCCH( j) + PL + h(nCQI , nHARQ ) + ∆F_PUCCH (F ) + g(i)} dBm
RSRP
RSRP at serving cell < threshold3 AND (&&)
RSRP at target > threshold3a
Serving Cell RSRP
threshold3 LNCEL; 0..97dB; 1dB; Baseline is -140dBm
threshold3a LNCEL; 0..97dB; 1dB; Baseline is -140dBm
a5Report Interval
Measurement Report
eNB
threshold3a threshold3
TD-LTE的链路自适应
DL链路自适应
PDSCH
OLQC (外环质量控制,DeltaCQI,基于ACK/NACK)
AMC (自适应调制与编码,MCS选择 )
PDCCH
AMC:CCE Aggregation Level自适应(1,2,4,8)
Intrafrequency measurements only
No neighbors measurements except the serving cell
注:此处3个Threshold2的数值关系是假设的
切换测量判决事件
RSRP
A3 trigger
RSRP
A5 trigger
A3 offset
Qoffsets,n
Rn > Rs => „cell reselection“
Qmeas,n
Rn
Rs
Treselection
tReselEutr LNCEL; 0…7s; 1s; -
Time
邻区测量触发
RSRP越来越弱
Threshold2Wcdma
RSRP Threshold2GERAN Threshold2InterFreq Threshold1 (reported)
RSRP
a3Offset
LNCEL; -15..15dB; 0.5dB; -
A3 condition met
RSRP Neighbour Cell
a3offset Serving Cell RSRP
a3ReportInterval
LNCEL; 120ms (0), 240ms (1), 480ms (2), 640ms (3), 1024ms (4), 2048ms (5), 5120ms (6), 10240ms (7), 1min (8), 6min (9), 12min (10), 30min (11), 60min (12); 240ms
a5TimeToTrigger
Measurement Report
a5ReportInterval
LNCEL; 120ms, 240ms, 480ms, 640ms, 1024ms, 2048ms, 5120sm, 10240ms, 1min, 6min, 12min, 30min, 60min; -
xu n = e , NZC
0 ≤ n ≤ NZC −1
rootSeqIndex,取值范围0…837
prachCS Preamble cyclic shift, 取值范围:0…15
随机接入参数
上行业务信道PUSCH功率控制 P93-99
Open Loop (OL)
Closed Loop (CL)
[ ] PPUSCH(i) = min{PCMAX ,10log10(MPUSCH(i)) + PO_PUSCH( j) +α( j) ⋅ PL + ∆TF(i) + f (i)} dBm
0.1 ms
1 ms
0.8 ms
UE Tx
CP
Preamble
GT eNB Rx
prachConfIndex
prachConfIndex取值范围:3-53
• f RA
•
t
0 RA
- 频域资源索引号. - 0,1 或2,指示PRACH出现在所有无线帧,还是偶
数无线帧,还是奇数无线帧
•
t
1 RA
- 0 或 1,指示PRACH出现在前半帧还是后半帧
RSRP serving
A5 thrd 3a
A5 thrd 3 RSRP serving
enableBetterCellHo 0 (false), 1 (true); 1 (true)
enableCovHo 0 (false), 1 (true); 1 (true)
Better Cell HO
RSRP at serving cell + a3Offset < RSRP at neighbor cell
在一个周期里的下行导频时隙能够调度的最大用户数 10MHz: 0...7 20MHz: 0…8
步骤4:频域调度
每个用户分配多少个PRB,分配哪些位 置上的PRB
dlsSchedType
下行调度方案类型 channelAware (0), DVRB (1)
随机接入 (P43-46)
prachConfIndex,PRACH 配置索引
PRACH类型: • Type 0: 1 ms • Type 1: 2 ms • Type 2: 2 ms • Type 3: 3 ms • Type 4: 157us
定义了PRACH PREAMBLE格式和发射所 在的系统帧及子帧。
ulpcLowlevSch ulpcUplevSch
参数 in BTSSM
Qmeas
小区重选R准则
Rs = Qmeas,s + Qhysts Rn = Qmeas,n - Qoffsets,n
Qmeas,s
qHyst 0dB (0)… 24dB (15); -
Qhysts
qOffsetCell
IAFIM; -24 dB (0)… 24 dB (30); - ; 0 dB(15)
a3TimeToTrigger
Measurement Report
reporting condition met after Time To Trigger
a3Report Interval
Measurement Report
eNB
Handovers Event A5
Coverage Handover
threshold3a threshold3
Neighbour Cell RSRP
time
-140 dBm
a5TimeToTrigger
LNCEL; 0ms (0), 40ms (1), 64ms (2), 80ms (3), 100ms (4), 128ms (5), 160ms (6), 256ms (7), 320ms (8), 480ms (9), 512ms (10), 640ms (11), 1024ms (12), 1280ms (13), 2560ms (14), 5120ms (15); 320ms
p0NomPucch:Nominal Power for UE PUCCH Tx Power Calculation, 范围:-127..-96; 1; -100 dB
闭环功控 1dB
SINR
ulpcUpqualSch ulpcUpqualCch
UP_QUAL_**
ulpcLowqualSch ulpcLowqualCch
LOW_QUAL_**
+ 1 dB or + 3 dB
- 1 dB
- 1 dB
1
2
3
+ 1 dB or
0 dB
+ 3 dB
-1 dB
4
5
6
1dB
+ 1 dB or + 3 dB
+ 1 dB or + 3 dB
+ 1 dB or + 3 dB
7
LOW_LEV_**
8
UP_LEV_**
9
RSSI
ulpcLowlevCch ulpcUplevCch
•
t
2 RA
- PRACH出现的上行子帧号
( ) fRA
,
t
0 RA
,
tபைடு நூலகம்
R1 A,
tR2A
prachFreqOff 取值范围0-94
PUCCH
PUSCH
n RA PRB
PRACH PUCCH
上行子帧
n RA PRB
PUCCH PRACH
PUSCH
PUCCH 上行子帧
Preamble的产生
ZC序列
( ) − j πun(n+1)
set 1 (CS1)
TD-LTE调度 (以下行为例)P52
步骤3:时域调度
每个TTI调度多少用户(Candidate Set2,CS2),调度哪些用户
调度算法:正比公平
maxNumUeDl 每TTI里下行能够调度的最大用户数 10MHz: 1...10 20MHz: 1…12
maxNumUeDlDwPTS
UL链路自适应
ulTargetBler
上行BLER目标
ILLA (内环链路自适应,基于BLER) 默认值10%
OLLA (外环链路自适应,基于ACK/NACK)
ATB (自适应传输带宽)
iniMcsDl
PDSCH信道上的初始调制编码值( MCS) 默认值4
iniMcsUl
PUSCH信道上的初始调制编码值( MCS) 默认值6
time
a3TimeToTrigger
LNCEL; 0ms (0), 40ms (1), 64ms (2), 80ms (3), 100ms (4), 128ms (5), 160ms (6), 256ms (7), 320ms (8), 480ms (9), 512ms (10), 640ms (11), 1024ms (12), 1280ms (13), 2560ms (14), 5120ms (15); 320ms