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(普通问题)
SG Grant table1和SG Grant table2有什么区别?
提问者: aoshicanglong 提问时间: 2012-04-20
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问题答案
( 1 )
英文原版的绝对准许和相对准许的对比希望能帮助你理解;
A relative grant command defines UP or DOWN step in the serving grant table, so it is not usable as such but it needs a reference power offset from where to make the UP/DOWN step. The reference power offset is NOT the serving grant that the NodeB has previously indicated to the UE, but it is a power offset value that UE has used in past transmission. Which transmission is used as a reference is defined by a strict timing, that is equal to HARQ acknowledgement timing on E-HICH channel. The Serving Grant Update procedure shall be applied at every TTI boundary and shall take into account the Absolute Grant message, Serving Relative Grant and non-serving Relative Grants that apply to the TTI.
Avsolute Grants
- Absolute Grants
- Only the serving Node-B can issue an absolute grant
- An absolute grant is addressed to a specific UE (like HS-SCCH)
- Max rate (pointer in the E-TFC set) is explicitly signaled to the UE
- Useful to rapidly ramp up or down the rate of an E-DCH
- Each grant contains
- E-RNTI to uniquely identify the UE
- Granted rate
- SingleProcess flag
- The SingleProcess flag specifies whether the absolute grant applies to only one HARQ process or all HARQ processes
- Upon reception, UE sets its max E-TFCI pointer to the value specified in the grant
- Absolute grant is sent over the E-AGCH shared downlink physical channel
Index | Absolute Grant Value |
---|---|
31 | (168/15)2x6 |
30 | (150/15)2x6 |
29 | (168/15)2x4 |
28 | (150/15)2x4 |
27 | (134/15)2x4 |
26 | (119/15)2x4 |
25 | (150/15)2x2 |
24 | (95/15)2x4 |
23 | (168/15)2 |
22 | (150/15)2 |
21 | (134/15)2 |
20 | (119/15)2 |
19 | (106/15)2 |
18 | (95/15)2 |
17 | (84/15)2 |
16 | (75/15)2 |
15 | (67/15)2 |
14 | (60/15)2 |
13 | (53/15)2 |
12 | (47/15)2 |
11 | (42/15)2 |
10 | (38/15)2 |
9 | (34/15)2 |
8 | (30/15)2 |
7 | (27/15)2 |
6 | (24/15)2 |
5 | (19/15)2 |
4 | (15/15)2 |
3 | (11/15)2 |
2 | (7/15)2 |
1 | ZERO_GRANT* |
0 | INACTIVE* |
Relative Grants
- Relative Grants
- Relative grants are a slower but less expensive way to control the max E-TFCI
- The serving cell issues an UP, DOWN or HOLD relative grant
- A non-serving cell issues HOLD or DOWN relative grant
- Relative grants are transmitted over the E-RGCH downlink signaling channel
- Relative rate control commands can be dedicated to a UE, common to a group of UEs, or common to all UEs in the cell, depending on which E-RGCH channels are specified for monitoring by the UEs
- Non-primary cells can issue relative rate grants to users in SHO for adjacent-cell interference mitigation
- How the Serving Grant work ?
- NodeB controls the UE bit rate by Serving Grants. A Serving Grant defines the power offset between E-DPDCH and DPCCH physical channels and there is 38 power offset values defined.
- RNC signals a set of reference power offsets, that define a E-TFCI and the corresponding power offset, eight references at maximum.
- NodeB and UE calculates the rest of E-TFCI and power offset mappings from the reference power offsets by formulas. The result gives a mapping table where each power offset value defines a certain transport block size.
- Absolute grant command explicitly defines a certain power offset value from the power offset table. There is only 31 different values available with absolute grant command, so not all serving grants can be denoted. The blue ones in the example table are the ones available with AG.
Index | Scheduled Grant/ DPDCH power offset | E-TFCI (TB index) | TB size |
---|---|---|---|
37 | (168/15)2*6 | NoValue | NoValue |
36 | (150/15)2*6 | NoValue | NoValue |
35 | (168/15)2*4 | 120 | 19950 |
34 | (150/15)2*4 | 110 | 16572 |
33 | (134/15)2*4 | 80 | 11514 |
32 | (119/15)2*4 | 76 | 10824 |
31 | (150/15)2*2 | 72 | 10152 |
?? | |||
13 | (27/15)2 | 8 | 708 |
12 | (24/15)2 | 6 | 540 |
11 | (21/15)2 | 5 | 522 |
10 | (19/15)2 | 3 | 354 |
9 | (17/15)2 | NoValue | NoValue |
8 | (15/15)2 | NoValue | NoValue |
7 | (13/15)2 | 1 | 186 |
6 | (12/15)2 | NoValue | NoValue |
5 | (11/15)2 | NoValue | NoValue |
4 | (9/15)2 | NoValue | NoValue |
3 | (8/15)2 | NoValue | NoValue |
2 | (7/15)2 | NoValue | NoValue |
1 | (6/15)2 | NoValue | NoValue |
0 | (5/15)2 | 0 | 18 |
A relative grant command defines UP or DOWN step in the serving grant table, so it is not usable as such but it needs a reference power offset from where to make the UP/DOWN step. The reference power offset is NOT the serving grant that the NodeB has previously indicated to the UE, but it is a power offset value that UE has used in past transmission. Which transmission is used as a reference is defined by a strict timing, that is equal to HARQ acknowledgement timing on E-HICH channel. The Serving Grant Update procedure shall be applied at every TTI boundary and shall take into account the Absolute Grant message, Serving Relative Grant and non-serving Relative Grants that apply to the TTI.
PO index | AG index | PO_str | PO_val | SgToEtfci(i) |
---|---|---|---|---|
37 | 31 | (168)^2*6 | 169344 | 54 |
36 | 30 | (150)^2*6 | 135000 | 54 |
35 | 29 | (168)^2*4 | 112896 | 54 |
34 | 28 | (150)^2*4 | 90000 | 54 |
33 | 27 | (134)^2*4 | 71824 | 54 |
32 | 26 | (119)^2*4 | 56644 | 54 |
31 | 25 | (150)^2*2 | 45000 | 54 |
30 | 24 | (95)^2*4 | 36100 | 54 |
29 | 23 | (168)^2 | 28224 | 54 |
28 | 22 | (150)^2 | 22500 | 54 |
27 | 21 | (134)^2 | 17956 | 54 |
26 | 20 | (119)^2 | 14161 | 54 |
25 | 19 | (106)^2 | 11236 | 54 |
24 | 18 | (95)^2 | 9025 | 52 |
23 | 17 | (84)^2 | 7056 | 44 |
22 | 16 | (75)^2 | 5625 | 38 |
21 | 15 | (67)^2 | 4489 | 32 |
20 | 14 | (60)^2 | 3600 | 28 |
19 | 13 | (53)^2 | 2809 | 24 |
18 | 12 | (47)^2 | 2209 | 20 |
17 | 11 | (42)^2 | 1764 | 18 |
16 | 10 | (38)^2 | 1444 | 14 |
15 | 9 | (34)^2 | 1156 | 12 |
14 | 8 | (30)^2 | 900 | 9 |
13 | 7 | (27)^2 | 729 | 8 |
12 | 6 | (24)^2 | 576 | 4 |
11 | - | (21)^2 | 441 | 4 |
10 | 5 | (19)^2 | 361 | 0 |
9 | - | (17)^2 | 289 | 0 |
8 | 4 | (15)^2 | 225 | 0 |
7 | - | (13)^2 | 169 | 0 |
6 | - | (12)^2 | 144 | 0 |
5 | 3 | (11)^2 | 121 | 0 |
4 | - | (9)^2 | 81 | 0 |
3 | - | (8)^2 | 64 | 0 |
2 | 2 | (7)^2 | 49 | 0 |
1 | - | (6)^2 | 36 | 0 |
0 | - | (5)^2 | 25 | 0 |
回答者:
xhy1331
回答时间:2012-04-20 18:59
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