Method, apparatus and system for electrical downtilt adjustment in a multiple input multiple output system
View Patent ↗Machine-readable media, methods, apparatus and system for electrical downtilt adjustment in a multiple input multiple output system are disclosed. In some embodiments, an apparatus may comprise an electrical downtilt module to determine an electrical downtilt angle for an antenna port selected from a number of antenna ports based on information from an user equipment (UE); and a codebook module to select a codeword corresponding to the antenna port from a codebook and calculate a weight of an antenna array of the eNB through inputting the electronic downtilt angle into the codeword, wherein the codebook has a first number of codewords, each of the codewords having a second number of elements to represent the weight of the antenna array, and wherein each of the codewords corresponds to each of the antenna ports and each of the elements corresponds to each antenna of the antenna array.
1. An apparatus, comprising:
an electrical downtilt circuitry to determine an electrical downtilt angle for an antenna port selected from a number of antenna ports based on information from a user equipment (UE);
and a codebook circuitry to select a codeword corresponding to the antenna port from a codebook and calculate a weight of an antenna array of an eNodeB (eNB) through inputting the electrical downtilt angle into the codeword, wherein the codebook has a first number of codewords, each of the codewords having a second number of elements to represent the weight of the antenna array, and wherein each of the codewords corresponds to each of the antenna ports and each of the elements corresponds to each antenna of the antenna array.
2. The apparatus of claim 1 , wherein the electrical downtilt angle is determined to reduce an antenna array gain for the antenna array at 90 degree elevation of departure (EoD).
3. The apparatus of claim 1 , wherein the electrical downtilt angle is determined to increase a cell edge coupling loss for the UE.
4. The apparatus of claim 1 , wherein the codeword is represented by a following equation:
w
i
=
1
M
[
1
e
j
(
α
+
θ
i
)
e
j
2
(
α
+
θ
i
)
⋮
e
j
(
M
-
1
)
(
α
+
θ
i
)
]
,
0
≤
i
≤
N
-
1
wherein, M represents a number of the antennas, N represents the number of antenna ports, w i represents the weight of the antenna array at i th antenna port, and α+θ i represents the electronic downtilt angle.
5. The apparatus of claim 1 , wherein the information received from the UE comprises the antenna port or a precoding matrix indicator (PMI) associated with the antenna port that the UE selects from the number of antenna ports based on channel state information reference signal (CSIRS) configuration information received from the eNB.
6. The apparatus of claim 5 , further comprising:
a transceiver to transmit the CSIRS configuration information to the UE and to receive the information related to the antenna port from the UE.
7. The apparatus of claim 1 , further comprising:
an antenna control circuitry to control the antenna array based on the weight calculated by the codebook circuitry.
8. A method, comprising:
determining an electrical downtilt angle for an antenna port selected from a number of antenna ports based on information from a user equipment (UE);
and selecting a codeword corresponding to the antenna port from a codebook and calculating a weight of an antenna array of an eNodeB (eNB) through inputting the electronic downtilt angle into the codeword, wherein the codebook has a first number of codewords, each of the codewords having a second number of elements to represent the weight of the antenna array, and wherein each of the codewords corresponds to each of the antenna ports and each of the elements corresponds to each antenna of the antenna array.
9. The method of claim 8 , wherein the electrical downtilt angle is determined to reduce an antenna array gain for the antenna array at 90 degree elevation of departure (EoD).
10. The method of claim 8 , wherein the electrical downtilt angle is determined to increase a cell edge coupling loss for the UE.
11. The method of claim 8 , wherein the codeword is represented by a following equation:
w
i
=
1
M
[
1
e
j
(
α
+
θ
i
)
e
j
2
(
α
+
θ
i
)
⋮
e
j
(
M
-
1
)
(
α
+
θ
i
)
]
,
0
≤
i
≤
N
-
1
wherein, M represents a number of the antennas, N represents the number of antenna ports, w i represents the weight of the antenna array at i th antenna port, and α+θ i represents the electronic downtilt angle.
12. The method of claim 8 , wherein the information received from the UE comprises the antenna port or a precoding matrix indicator (PMI) associated with the antenna port that the UE selects from the number of antenna ports based on channel state information reference signal (CSIRS) configuration information received from the eNB.
13. The method of claim 12 , further comprising:
transmitting the CSIRS configuration information to the UE and to receive the information related to the antenna port from the UE.
14. The method of claim 8 , further comprising:
controlling the antenna array based on the weight calculated by a codebook circuitry.
15. A non-transitory computer readable medium encoded with computer executable instructions, which when accessed, causes a mobile station to perform operations comprising:
determining an electrical downtilt angle for an antenna port selected from a number of antenna ports based on information from a user equipment (UE);
and selecting a codeword corresponding to the antenna port from a codebook and calculating a weight of an antenna array of an eNodeB (eNB) through inputting the electrical downtilt angle into the codeword, wherein the codebook has a first number of codewords, each of the codewords having a second number of elements to represent the weight of the antenna array, and wherein each of the codewords corresponds to each of the antenna ports and each of the elements corresponds to each antenna of the antenna array.
16. The non-transitory computer readable medium of claim 15 , wherein the electrical downtilt angle is determined to reduce an antenna array gain for the antenna array at a 90 degree elevation of departure (EoD).
17. The non-transitory computer readable medium of claim 15 , wherein the electrical downtilt angle is determined to increase a cell edge coupling loss for the UE.
18. The non-transitory computer readable medium of claim 15 , wherein the codeword is represented by a following equation:
w
i
=
1
M
[
1
e
j
(
α
+
θ
i
)
e
j
2
(
α
+
θ
i
)
⋮
e
j
(
M
-
1
)
(
α
+
θ
i
)
]
,
0
≤
i
≤
N
-
1
wherein, M represents a number of the antennas, N represents the number of antenna ports, w i represents the weight of the antenna array at i th antenna port, and α+θ i represents the electronic downtilt angle.
19. The non-transitory computer readable medium of claim 15 , wherein the information received from the UE comprises the antenna port or a precoding matrix indicator (PMI) associated with the antenna port that the UE selects from the number of antenna ports based on channel state information reference signal (CSIRS) configuration information received from the eNB.
20. The non-transitory computer readable medium of claim 19 , further comprising:
transmitting the CSIRS configuration information to the UE and to receive the 15 information related to the antenna port from the UE.
21. The non-transitory computer readable medium of claim 15 , further comprising:
controlling the antenna array based on the weight calculated by a codebook circuitry.