Sounding reference signal cell specific sub-frame configuration
View Patent ↗A method of wireless communication including a plurality of fixed basestations and a plurality of mobile user equipment with each basestation transmitting to any user equipment within a corresponding cell a sounding reference signal sub-frame configuration indicating sub-frames when sounding is permitted. Each user equipment recognizes the sounding reference signal sub-frame configuration and sounds only at permitted sub-frames. Differing cells may have differing sounding reference signal sub-frame configurations. There are numerous manners to encode the transmitted information.
1. A method of wireless communication including a plurality of fixed basestations and a plurality of mobile user equipment comprising the steps of:
each fixed basestation transmitting to any mobile user equipment within a corresponding cell a sounding reference signal sub-frame configuration indicating sub-frames when sounding is permitted, said transmitting including
transmitting a periodicity T SFC , and
transmitting an offset Δ SFC ;
each mobile user equipment within said corresponding cell recognizing said sounding reference signal sub-frame configuration; and
each mobile user equipment sounding only at sub-frames when sounding is permitted according to said recognized sounding reference signal sub-frame configuration, said sounding including
maintaining a sub-frame count C SFC , and
sounding only if Δ SFC =(C SFC )mod T SFC .
2. The method of claim 1 , wherein:
said step of each fixed basestation transmitting a sounding reference signal sub-frame configuration wherein differing fixed basestations may transmit differing sounding reference signal sub-frame configurations.
3. The method of claim 1 , wherein:
said steps of transmitting said periodicity T SFC and transmitting said offset Δ SFC includes separately coding said periodicity T SFC and said offset Δ SFC .
4. The method of claim 1 , wherein:
said steps of transmitting said periodicity T SFC and transmitting said offset Δ SFC includes jointly coding said periodicity T SFC and said offset Δ SFC .
5. The method of claim 4 , wherein:
Said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 4 bits suitable for use in frequency division duplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
0000
1
0
1
0001
2
0
2
0010
2
1
3
0011
5
0
4
0100
5
1
5
0101
5
2
6
0110
10
0
7
0111
10
1
8
1000
10
2
9
1001
20
0
10
1010
20
1
11
1011
20
2
12
1100
40
0
13
1101
40
1
14
1110
40
2
15
1111
Inf.
NA
where: coding of decimal 15 indicates no sounding reference signal (SRS) thus T SFC , Δ SFC is meaningless and not applicable (NA).
6. The method of claim 4 , wherein:
said step of jointly coding said periodicity and said offset Δ SFC codes in 4 bits suitable for use in frequency division duplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
0000
1
0
1
0001
2
0
2
0010
2
1
3
0011
5
2
4
0100
5
3
5
0101
5
4
6
0110
10
5
7
0111
10
6
8
1000
10
7
9
1001
20
8
10
1010
20
9
11
1011
20
10
12
1100
40
11
13
1101
40
12
14
1110
40
13
15
1111
Inf.
NA
where: a coding of decimal 15 indicates no sounding reference signal (SRS) thus T SFC is infinite, Δ SFC is meaningless and not applicable (NA).
7. The method of claim 4 , wherein:
Said step of jointly coding said T SFC and said offset Δ SFC codes 5 bits suitable for use in a frequency division duplex system is as follows:
Decimal
Binary
T SFC
Δ SFC
0
00000
1
0
1
00001
2
0
2
00010
2
1
3
00011
5
0
4
00100
5
1
5
00101
5
2
6
00110
5
3
7
00111
5
4
8
01000
10
0
9
01001
10
1
10
01010
10
2
11
01011
10
3
12
01100
10
4
13
01101
10
5
14
01110
10
6
15
01111
20
0
16
10000
20
1
17
10001
20
2
18
10010
20
3
19
10011
20
4
20
10100
20
5
21
10101
20
6
22
10110
40
0
23
10111
40
1
24
11000
40
2
25
11001
40
3
26
11010
40
4
27
11011
40
5
28
11100
40
6
29
11101
Optional
30
11110
Optional
31
11111
Inf.
NA
where: coding of decimal 29 and 30 are not defined; and a coding of decimal 31 indicates no sounding reference signal (SRS) thus T SFC is infinite, Δ SFC is meaningless and not applicable (NA).
8. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 5 bits suitable for use in frequency division duplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
00000
1
0
1
00001
2
0
2
00010
2
1
3
00011
5
0
4
00100
5
1
5
00101
5
2
6
00110
5
3
7
00111
5
4
8
01000
10
0
9
01001
10
1
10
01010
10
2
11
01011
10
3
12
01100
10
4
13
01101
10
5
14
01110
10
6
15
01111
10
7
16
10000
20
0
17
10001
20
1
18
10010
20
2
19
10011
20
3
20
10100
20
4
21
10101
20
5
22
10110
20
6
23
10111
20
7
24
11000
40
0
25
11001
40
1
26
11010
40
2
27
11011
40
3
28
11100
40
4
29
11101
40
5
30
11110
40
6
31
11111
Inf.
NA
where: a coding of decimal 31 indicates no SRS thus T SFC is infinite, Δ SFC is meaningless and not applicable (NA).
9. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 5 bits suitable for use in a frequency division duplex system as follows:
Decimal
Binary
T SFC
Δ SFC
0
00000
1
0
1
00001
2
0
2
00010
2
1
3
00011
5
0
4
00100
5
1
5
00101
5
2
6
00110
5
3
7
00111
5
4
8
01000
10
3
9
01001
10
4
10
01010
10
5
11
01011
10
6
12
01100
10
7
13
01101
10
8
14
01110
10
9
15
01111
20
10
16
10000
20
11
17
10001
20
12
18
10010
20
13
19
10011
20
14
20
10100
20
15
21
10101
20
16
22
10110
40
17
23
10111
40
18
24
11000
40
19
25
11001
40
20
26
11010
40
21
27
11011
40
22
28
11100
40
23
29
11101
Optional
30
11110
Optional
31
11111
Inf.
NA
where: codings decimal 29 and 30 are not defined; and a coding of decimal 31 indicates no SRS thus T SFC is infinite, Δ SFC is meaningless and not applicable (NA).
10. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 4 bits suitable for use in time division duplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
0000
1
0
1
0001
5
1 (a)
2
0010
5
1 (b)
3
0011
5
2
4
0100
10
0
5
0101
10
1 (a)
6
0110
10
1 (b)
7
0111
10
2
8
1000
20
0
9
1001
20
1 (a)
10
1010
20
1 (b)
11
1011
20
2
12
1100
40
0
13
1101
40
1 (a)
14
1110
40
1 (b)
15
1111
Inf.
NA
where: codings decimal 1, 2, 5, 6, 9, 10, 13 and 14 are encoded with respect to UpPTS orthogonal frequency division multiplexing OFDM symbols with 1(a) meaning a first OFDM symbol determines Δ SFC and with 1(b) meaning a second OFDM symbol determines Δ SFC ; and a coding of decimal 15 indicates no SRS thus T SFC is infinite, Δ SFC is meaningless and not applicable (NA).
11. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 5 bits suitable for use in time division multiplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
00000
1
0
1
00001
5
1 (a)
2
00010
5
1 (b)
3
00011
5
1 (a) + 1 (b)
4
00100
5
2
5
00101
5
3
6
00110
5
4
7
00111
10
1 (a)
8
01000
10
1 (b)
9
01001
10
1 (a) + 1 (b)
10
01010
10
2
11
01011
10
3
12
01100
10
4
13
01101
10
7
14
01110
10
8
15
01111
20
1 (a)
16
10000
20
1 (b)
17
10001
20
1 (a) + 1 (b)
18
10010
20
2
19
10011
20
3
20
10100
20
4
21
10101
20
7
22
10110
20
8
23
10111
40
1 (a)
24
11000
40
1 (b)
25
11001
40
1 (a) + 1 (b)
26
11010
40
2
27
11011
40
3
28
11100
40
4
29
11101
40
7
30
11110
40
8
31
11111
Inf.
NA
where: codings decimal 1, 2, 3, 7, 8, 9, 15, 16, 17, 23, 24 and 25 are encoded with respect to UpPTS orthogonal frequency division multiplexing OFDM symbols with 1(a) meaning a first OFDM symbol determines Δ SFC , with 1(b) meaning a second OFDM symbol determines Δ SFC and with 1(a)+1(b) meaning that both OFDM symbols determines Δ SFC ; and a coding of decimal 31 indicates no SRS thus T SFC is infinite, Δ SFC is meaningless and not applicable (NA).
12. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 5 bits suitable for use in time division multiplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
00000
1
0
1
00001
5
1 (a)
2
00010
5
1 (b)
3
00011
5
1 (a) + 1 (b)
4
00100
5
2
5
00101
5
3
6
00110
5
4
7
00111
10
1 (a)
8
01000
10
1 (b)
9
01001
10
1 (a) + 1 (b)
10
01010
10
2
11
01011
10
3
12
01100
10
6 (a)
13
01101
10
6 (b)
14
01110
10
6 (a) + 6 (b)
15
01111
20
1 (a)
16
10000
20
1 (b)
17
10001
20
1 (a) + 1 (b)
18
10010
20
2
19
10011
20
3
20
10100
20
6 (a)
21
10101
20
6 (b)
22
10110
20
6 (a) + 6 (b)
23
10111
40
1 (a)
24
11000
40
1 (b)
25
11001
40
1 (a) + 1 (b)
26
11010
40
2
27
11011
40
3
28
11100
40
6 (a)
29
11101
40
6 (b)
30
11110
40
6 (a) + 6 (b)
31
11111
Inf.
NA
where: codings decimal 1, 2, 3, 7, 8, 9, 12 to 17, 20 to 25, 28, 29 and 30 are encoded with respect to UpPTS orthogonal frequency division multiplexing OFDM symbols with 1(a) meaning a first OFDM symbol determines Δ SFC , with 1(b) meaning a second OFDM symbol determines Δ SFC and with 1(a)+1(b) meaning that both OFDM symbols determines Δ SFC ; and a coding of decimal 31 indicates no SRS thus T SFC is infinite, Δ SFC is meaningless and not applicable (NA).
13. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 4 its suitable for use in frequency division multiplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
0000
1
0
1
0001
2
0
2
0010
2
1
3
0011
5
0
4
0100
5
1
5
0101
5
2
6
0110
5
3
7
0111
5
0, 1
8
1000
5
2, 3
9
1001
10
0
10
1010
10
1
11
1011
10
2
12
1100
10
3
13
1101
10
0, 1, 2, 3, 4, 6, 8
14
1110
10
0, 1, 2, 3, 4, 5, 6, 8
15
1111
reserved
reserved
where: sounding reference signal sub-frames satisfy └n s /2┘ mod T SFC εΔ SFC .
14. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC codes in 4 its suitable for use in time division multiplex systems as follows:
Decimal
Binary
T SFC
Δ SFC
0
0000
5
1
1
0001
5
1, 2
2
0010
5
1, 3
3
0011
5
1, 4
4
0100
5
1, 2, 3
5
0101
5
1, 2, 4
6
0110
5
1, 3, 4
7
0111
5
1, 2, 3, 4
8
1000
10
1, 2, 6
9
1001
10
1, 3, 6
10
1010
10
1, 6, 7
11
1011
10
1, 2, 6, 8
12
1100
10
1, 3, 6, 9
13
1101
10
1, 4, 6, 7
14
1110
reserved
reserved
15
1111
reserved
reserved
where: sounding reference signal sub-frames are the sub-frames satisfying └n s /2┘ mod T SFC εΔ SFC ; and sounding reference signals are transmitted only in configured UL sub-frames or UpPTS.
15. The method of claim 4 , wherein:
said step of jointly coding said periodicity T SFC and said offset Δ SFC includes
forming a tree structure with a number of levels corresponding to a number of permitted periodicities T SFC and a number of nodes within each level corresponding to a number of permitted corresponding offsets Δ SFC ,
numbering nodes of said tree structure starting with 1 at a base node and numbering a level in left to right order before numbering a next level, and
transmitting a corresponding node number.
16. The method according to claim 15 , wherein:
said step of each mobile user equipment within recognizing said sounding reference signal sub-frame configuration includes
recognizing a periodicity T SFC from said tree level of said node number, and
recognizing an offset Δ SFC dependent on said node number.
17. The method according to claim 16 , wherein:
said step of recognizing an offset Δ SFC dependent on said node number includes subtracting a constant from said node number and mapping a difference to a particular offset Δ SFC .
18. The method according to claim 16 , wherein:
said step of recognizing an offset Δ SFC dependent on said node number sets said offset Δ SFC to (node number)modulo T SFC .
19. The method of claim 1 , wherein:
said step of each fixed basestation transmitting a sounding reference signal sub-frame configuration further includes
transmitting a parameter δ SFC ;
said step of each mobile user equipment sounding only at sub-frames when sounding is permitted further includes
sounding if
Δ SFC =( C SFC )mod T SFC ,
1+Δ SFC =( C SFC )mod T SFC ,
2+Δ SFC =( C SFC )mod T SFC , or
δ SFC +Δ SFC =( C SFC )mod T SFC .
20. The method of claim 19 , wherein:
said parameter δ SFC is a predetermined constant.
21. The method of claim 19 , wherein:
said parameter δ SFC is inferred from a cell ID.
22. The method of claim 19 , wherein:
said steps of transmitting said periodicity T SFC , transmitting said offset Δ SFC and transmitting a parameter δ SFC includes separately coding said periodicity T SFC , said offset Δ SFC and said parameter δ SFC .
23. The method of claim 19 , wherein:
said steps of transmitting said periodicity T SFC , transmitting said offset Δ SFC and transmitting a parameter δ SFC includes jointly coding said periodicity T SFC , said offset Δ SFC and said parameter δ SFC .