Directional direction selection method, apparatus, and system

Patent metadata

Field	Value
Publication number	US-10056959-B2
Application number	US-201615266770-A
Country	US
Kind code	B2
Filing date	Sep 15, 2016
Priority date	Mar 18, 2014
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Embodiments of the present invention disclose a directional direction selection method, apparatus, and system. The method includes: sending L groups of pilots in an omnidirectional direction manner, where the L groups of pilots are received by UE by using L directional directions, and the L groups of pilots are used by the UE to switch to a directional direction with best channel quality in the L directional directions; sending, by a base station, S groups of pilots by using S directional directions respectively; determining, by the base station, an optimal directional direction in the S directional directions according to the channel quality corresponding to the S groups of pilots; and switching, by the base station, to the optimal directional direction in the S directional directions.

First claim

What is claimed is:

1. A directional direction selection method, comprising:
sending, by a base station, L groups of pilots in an omnidirectional direction manner, wherein the L groups of pilots are received by user equipment (UE) using L directional directions, in a one-to-one correspondence with the L groups of pilots, the L groups of pilots are used by the UE to estimate channel quality corresponding to each directional direction in the L directional directions and switch to a directional direction with best channel quality in the L directional directions, wherein L is less than or equal to N, and N is a quantity of reconfigurable directional directions supported by the UE;
sending, by the base station, S groups of pilots by using S directional directions respectively, wherein the S groups of pilots are received by the UE by using the directional direction with the best channel quality in the L directional directions, the S groups of pilots are in a one-to-one correspondence with the S directional directions, 1≤S≤M, M is a quantity of reconfigurable directional directions supported by the base station, and the S groups of pilots are used by the UE to estimate channel quality corresponding to the S directional directions;
determining, by the base station, an optimal directional direction in the S directional directions according to the channel quality corresponding to the S groups of pilots, wherein the optimal directional direction in the S directional directions is represented as an m opt directional direction; and
switching, by the base station, to the optimal directional direction in the S directional directions.

2. The method according to claim 1 , wherein determining an optimal directional direction in the S directional directions according to the channel quality corresponding to the S groups of pilots comprises:
receiving, by the base station, channel quality information fed back by the UE; and
determining, by the base station, the optimal directional direction in the S directional directions according to the channel quality information, wherein the channel quality information comprises the channel quality corresponding to the S directional directions, or a directional direction with best channel quality in the S directional directions and channel quality corresponding to the directional direction with the best channel quality in the S directional directions.

3. The method according to claim 1 , wherein determining an optimal directional direction in the S directional directions according to the channel quality corresponding to the S groups of pilots comprises:
receiving, by the base station, a directional direction with best channel quality in the S directional directions that is fed back by the UE; and
determining, by the base station, the optimal directional direction in the S directional directions according to the directional direction with the best channel quality.

4. The method according to claim 2 , wherein:
a quantity of the UEs is K, wherein K is greater than or equal to 2; and
the method further comprises:
allocating, by the base station, a sub-channel to each UE.

5. The method according to claim 4 , wherein determining the optimal directional direction in the S directional directions comprises:
calculating, according to the channel quality information, a total system capacity corresponding to each directional direction in the S directional directions; and
determining a directional direction corresponding to a maximum value of the total system capacities as the optimal directional direction.

6. The method according to claim 5 , wherein calculating, according to the channel quality information, a total system capacity corresponding to each directional direction in the S directional directions comprises:
calculating a total system capacity corresponding to an m th directional direction in the S directional directions according to a formula

C
m

=

∑

j
=
1

J

⁢

max

k
=
1

,

⁢

2
⁢

⁢
…
⁢

⁢
K

⁢

log
2

⁡

(

1
+

G
k
d

⁡

(

m
,

n
k
*

)

j

)

,

wherein 1≤m≤S, J represents a total quantity of sub-channels, d represents directional, j represents a serial number of a sub-channel, n k * represents a directional direction with best channel quality of a k th UE, C m represents the total system capacity corresponding to the m th directional direction, log 2 (1+G k d (m,n k *) j ) represents a channel capacity that is of a j th sub-channel and corresponding to the k th UE when the k th UE uses the n k * directional direction and the base station uses the m th directional direction, G k d (m,n k *) j ) represents channel quality that is of the j th sub-channel and corresponding to the k th UE when the k th UE uses the n k * directional direction and the base station uses the m th directional direction, and

max

k
=
1

,

⁢

2
⁢

⁢

Assignees

• Huawei Tech Co Ltd

Inventors

• Lu Weishan
• Wu Tao

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04W72/085

  Electricity · mapped topic

• H04B7/088 Primary

  using beam selection · CPC title

• H04B7/0684

  using different training sequences per antenna · CPC title

• H04B7/0695

  using beam selection · CPC title