Method and a central base station for interference management in a cellular network
First Claim
1. A method, in a central base station, for interference management in a cellular network employing Space-Division uplink, UL, downlink, DL, Duplexing, SDD, the central base station being connected to a plurality of Remote Radio Units, RRU, each RRU having multiple antennas, the method comprising:
- assigning each RRU of the plurality of RRUs as either a transmitting, Tx, RRU operable to dedicatedly transmit downlink signals to a plurality of User Equipments, UEs, or a receiving, Rx, RRU operable to dedicatedly receive uplink signals from the plurality of UEs at the same frequency band and same time as the transmission of the Tx RRUs;
estimating channel status information, CSI, between each Tx RRU and its neighbouring Rx RRUs;
selecting at least one Tx RRU as serving Tx RRU for a UE;
selecting at least one Rx RRU as serving Rx RRU for the UE; and
receiving an uplink traffic signal from the UE via each serving Rx RRU using a Rx spatial beamforming, BF, weighting matrix to null downlink traffic signals transmitted from the neighbouring Tx RRUs, wherein the Rx spatial BF weighting matrix is determined based on CSI between each serving Rx RRU and the neighbouring Tx RRUs and CSI between the UE and each serving Rx RRU.
1 Assignment
0 Petitions
Accused Products
Abstract
The embodiments relate to a method and a base station (110) for interference management in a cellular network (100) employing Space-Division uplink (UL) downlink (DL) Duplexing (SDD). The base station (110) assigns a plurality of Remote Radio Units (RRU) as Tx RRUs operable to dedicatedly transmit downlink signals to a plurality of UEs and Rx RRUs operable to dedicatedly receive uplink signals from the plurality of UEs at the same frequency band and same time as the transmission of the Tx RRUs. The base station then suppresses the interference caused by simultaneous transmission on the same frequency band by using a Tx spatial beamforming weighting matrix and a Rx spatial beamforming weighting matrix. In addition, the base station may perform cross-talk cancellation on the residual interference contained in the received signals by using the knowledge of the downlink traffic data.
7 Citations
24 Claims
-
1. A method, in a central base station, for interference management in a cellular network employing Space-Division uplink, UL, downlink, DL, Duplexing, SDD, the central base station being connected to a plurality of Remote Radio Units, RRU, each RRU having multiple antennas, the method comprising:
-
assigning each RRU of the plurality of RRUs as either a transmitting, Tx, RRU operable to dedicatedly transmit downlink signals to a plurality of User Equipments, UEs, or a receiving, Rx, RRU operable to dedicatedly receive uplink signals from the plurality of UEs at the same frequency band and same time as the transmission of the Tx RRUs; estimating channel status information, CSI, between each Tx RRU and its neighbouring Rx RRUs; selecting at least one Tx RRU as serving Tx RRU for a UE; selecting at least one Rx RRU as serving Rx RRU for the UE; and receiving an uplink traffic signal from the UE via each serving Rx RRU using a Rx spatial beamforming, BF, weighting matrix to null downlink traffic signals transmitted from the neighbouring Tx RRUs, wherein the Rx spatial BF weighting matrix is determined based on CSI between each serving Rx RRU and the neighbouring Tx RRUs and CSI between the UE and each serving Rx RRU. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A central base station in a cellular network employing Space-Division uplink, UL, downlink, DL, Duplexing, SDD, the central base station comprising:
-
an interface operable to connect the central base station to a plurality of Remote Radio Units, RRU, each RRU having multiple antennas; a central controlling unit operable to; assign each of the plurality of RRUs as either a transmitting, Tx, RRU operable to dedicatedly transmit downlink signals to a plurality of User Equipments (UE) or a receiving, Rx, RRU operable to dedicatedly receive uplink signals from the plurality of UEs at the same frequency band and same time as the transmission of the Tx RRUs; estimate channel status information, CSI, between each Tx RRU and its neighbouring Rx RRUs; select at least one Tx RRU as serving Tx RRU for a UE; select at least one Rx RRU as serving Rx RRU for the UE; and receive an uplink traffic signal from the UE via each serving Rx RRU using a Rx spatial beamforming, BF, weighting matrix to null downlink traffic signals transmitted from the neighbouring Tx RRUs to other UEs, wherein the Rx spatial BF weighting matrix is determined based on CSI between each serving Rx RRU and the neighbouring Tx RRUs and CSI between the UE and each serving Rx RRU. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification