Method, apparatus and system for electrical downtilt adjustment in a multiple input multiple output system

Patent metadata

Field	Value
Publication number	US-9762306-B2
Application number	US-201414911262-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Aug 8, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

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.

First claim

What is claimed is:

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

Assignees

• Intel Ip Corp

Inventors

• Chen Xiaogang
• Zhu Yuan
• Xue Feng
• Shirani-Mehr Hooman
• Li Qinghua

Classifications

• H04W72/54

  based on quality criteria · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/541

  using the level of interference · CPC title

• H04W56/0005

  synchronizing of arrival of multiple uplinks · CPC title

• E04G23/0218

  Increasing or restoring the load-bearing capacity of building construction elements (E04G23/0203 and E04G23/0266 take precedence) · CPC title