Apparatus and method for transmitting and receiving of cyclic shift parameter for supporting orthogonality in MIMO environment
A method includes: determining a Cyclic Shift (CS) parameter that implicitly indicates an orthogonality allocation rule and orthogonality-related information, by determining a multiple access state of a User Equipment (UE), and transmitting the determined CS parameter to the UE, wherein the orthogonality-related information includes an Orthogonal Cover Code indicated by the CS parameter, the orthogonality allocation rule is determined as a uniform scheme or a non-uniform scheme according to the CS parameter, determining the CS parameter by which the non-uniform scheme is applied if the UE is in a Single User Multiple Input Multiple Output state, and determining the CS parameter by which the uniform scheme is applied if the UE is in a Multiple User Multiple Input Multiple Output state.
1. A method, comprising:
receiving a Cyclic Shift (CS) parameter from a Base Station (BS); and
transmitting, to the BS, reference signals for N layers, the reference signals being generated based on the CS parameter and an Orthogonal Cover Code (OCC), N being an integer,
wherein if the CS parameter comprises one of 000, 001, 010 and 111, OCCs of a first layer and a second layer are identical and OCCs of a third layer and a fourth layer are identical while the OCC of the third layer is different from the OCC of the first layer, and
wherein if the CS parameter comprises one of 101, 011, 100 and 110, an OCC is identically allocated to all of the N layers.
2. The method of claim 1 , wherein the OCC of the first layer and the second layer is [1, 1] and the OCC of the third layer and the fourth layer is [1, −1] when the CS parameter is one of 000 and 111.
3. The method of claim 1 , wherein the OCC of the first layer and the second layer is [1, −1] and the OCC of the third layer and the fourth layer is [1, 1] when the CS parameter is one of 001 and 010.
4. The method of claim 1 , wherein the OCC of the all of the N layers is [1, 1] when the CS parameter is one of 011 and 100, and
wherein the OCC of the all of the N layer is [1, −1] when the CS parameter is one of 101 and 110.
5. The method of claim 1 , wherein a first set is {0, 3, 6, 9}, and elements of the first set are allocated to the first layer, the second layer, the third layer, and the fourth layer, respectively.
6. The method of claim 1 , wherein a second set is one of {1, 4, 7, 10} and {2, 5, 8, 11}, and elements of the second set are allocated to the first layer, the second layer, the third layer, and the fourth layer, respectively.
7. The method of claim 1 , wherein the CS parameter is a 3-bit value indicating one set from among a plurality of sets comprising a first set and a second set, and wherein the 3-bit value further indicates one or more OCCs to be associated with the N layers.
8. A User Equipment (UE) comprising:
a receiver to receive a Cyclic Shift (CS) parameter from a Base Station (BS); and
a reference signal transmitter to transmit, to BS, the reference signals for N layers, reference signals being generated based on the CS parameter and an Orthogonal Cover Code (OCC), N being an integer,
wherein if the CS parameter comprises one of 000, 001, 010 and 111, OCCs of a first layer and a second layer are identical and OCCs of a third layer and a fourth layer are identical while the OCC of the third layer is different from the OCC of the first layer, and
wherein if the CS parameter comprises one of 101, 011, 100 and 110, an OCC is identically allocated to all of the N layers.
9. The UE of claim 8 , wherein the OCC of the first layer and the second layer is [1, 1] and the OCC of the third layer and the fourth layer is [1, −1] when the CS parameter is one of 000 and 111.
10. The UE of claim 8 , wherein the OCC of the first layer and the second layer is [1, −1] and the OCC of the third layer and the fourth layer is [1, 1] when the CS parameter is one of 001 and 010.
11. The UE of claim 8 , wherein the OCC of the all of the N layers is [1, 1] when the CS parameter is one of 011 and 100, and
wherein the OCC of the all of the N layer is [1, −1] when the CS parameter is one of 101 and 110.
12. The UE of claim 8 , wherein a first set is {0, 3, 6, 9}, and elements of the first set are allocated to the first layer, the second layer, the third layer, and the fourth layer, respectively.
13. The UE of claim 8 , wherein a second set is one of {1, 4, 7, 10} and {2, 5, 8, 11}, and elements of the second set are allocated to the first layer, the second layer, the third layer, and the fourth layer, respectively.
14. The UE of claim 8 , wherein the CS parameter is a 3-bit value indicating one set from among a plurality of sets comprising a first set and a second set, and
wherein the 3-bit value further indicates one or more OCCs to be associated with the N layers.
15. A method comprising:
transmitting a Cyclic Shift (CS) parameter to a User Equipment (UE), the CS parameter being associated with reference signals for N layers, N being an integer;
receiving the reference signals for N layers generated based on the CS parameter and an Orthogonal Cover Code (OCC); and
decoding the received reference signals,
wherein if the CS parameter comprises one of 000, 001, 010 and 111, OCCs of a first layer and a second layer are identical and OCCs of a third layer and a fourth layer are identical while the OCC of the third layer is different from the OCC of the first layer, and
wherein, if the CS parameter comprises one of 101, 011, 100 and 110, an OCC is identically allocated to all of the N layers.
16. The method of claim 15 , wherein the OCC of the first layer and the second layer is [1, 1] and the OCC of the third layer and the fourth layer is [1, −1] when the CS parameter is one of 000 and 111.
17. The method of claim 15 , wherein the OCC of the first layer and the second layer is [1, −1] and the OCC of the third layer and fourth layer is [1, 1] when the CS parameter is one of 001 and 010.
18. The method of claim 15 , wherein the OCC of the all of the N layers is [1, 1] when the CS parameter is one of 011 and 100, and
wherein the OCC of the all of the N layer is [1, −1] when the CS parameter is one of 101 and 110.
19. The method of claim 15 , wherein a first set is {0, 3, 6, 9}, and elements of the first set are allocated to the first layer, the second layer, the third layer, and the fourth layer, respectively, and
wherein a second set is one of {1, 4, 7, 10} and {2, 5, 8, 11}, and elements of the second set are allocated to the first layer, the second layer, the third layer, and the fourth layer, respectively.
20. The method of claim 15 , wherein the CS parameter is a 3-bit value indicating one set from among a plurality of sets comprising the first set and the second set, and
wherein the 3-bit value further indicates one or more OCCs to be associated with the N layers.