US 11,683,077 B2
Coordinated transmission control method, apparatus, and system
Xiangbai Liao, Wuhan (CN); Yingzhuang Liu, Wuhan (CN); and Jian Yu, Shenzhen (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Jul. 17, 2020, as Appl. No. 16/931,551.
Application 16/931,551 is a continuation of application No. PCT/CN2019/072313, filed on Jan. 18, 2019.
Claims priority of application No. 201810054522.8 (CN), filed on Jan. 19, 2018.
Prior Publication US 2020/0350964 A1, Nov. 5, 2020
Int. Cl. H04B 7/0456 (2017.01); H04B 7/06 (2006.01); H04L 5/00 (2006.01); H04L 25/02 (2006.01); H04W 24/08 (2009.01); H04W 28/18 (2009.01); H04W 84/12 (2009.01); H04W 92/20 (2009.01)
CPC H04B 7/0456 (2013.01) [H04B 7/0617 (2013.01); H04L 5/0073 (2013.01); H04L 25/0202 (2013.01); H04W 24/08 (2013.01); H04W 28/18 (2013.01); H04W 84/12 (2013.01); H04W 92/20 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A coordinated transmission control method, wherein the method comprises:
receiving, by a secondary access point (AP), a coordinated transmission request sent by a primary AP, wherein the coordinated transmission request carries negotiation parameter information;
sending, by the secondary AP, interference test information to the primary AP when the secondary AP performs coordinated transmission with the primary AP based on the negotiation parameter information; and
receiving decision information that indicates whether to perform coordinated transmission and that is sent by the primary AP based on the interference test information,
wherein the negotiation parameter information comprises at least one of the following: a quantity of antennas of the primary AP or a quantity of spatial flows in a cell corresponding to the primary AP, and
wherein the sending, by the secondary AP, the interference test information to the primary AP comprises:
if the quantity of spatial flows is less than or equal to the quantity of antennas of the primary AP, and a quantity of antennas of the secondary AP is greater than the quantity of antennas of the primary AP, sending, by the secondary AP, the interference test information to the primary AP by using a first precoding matrix Q2, wherein Q2 is a precoding matrix that is used to prevent interference to data reception performed by the primary AP and that is determined by the secondary AP according to a preset first standard; or
if the quantity of spatial flows is less than the quantity of antennas of the primary AP, and a quantity of antennas of the secondary AP is less than or equal to the quantity of antennas of the primary AP, sending, by the secondary AP, second indication information to the primary AP to indicate a receive equalization matrix W1 used by the primary AP to receive data, and sending the interference test information by using a second precoding matrix Q2′, wherein Q2′ is a precoding matrix that is used to prevent interference to data reception performed by the primary AP, that is used by the secondary AP to send data, and that is determined by the secondary AP according to a preset second standard.