DETECTING UPLINK/DOWNLINK TIME-DIVISION DUPLEXED (TDD) FRAME CONFIGURATIONS TO SYNCHRONIZE TDD DOWNLINK AND UPLINK COMMUNICATIONS BETWEEN TDD COMMUNICATIONS EQUIPMENT
First Claim
1. A time-division duplexed (TDD) communications unit, comprising:
- a TDD communications signal interface configured to receive a downlink TDD communications signal and an uplink TDD communications signal over a communications medium;
an uplink transmitter circuit coupled to the TDD communications signal interface, the uplink transmitter circuit configured to transmit the uplink TDD communications signal over the communications medium during at least one uplink frame period of a TDD frame based on a received uplink transmission control signal;
a downlink receiver circuit coupled to the TDD communications signal interface, the downlink receiver circuit configured to be deactivated to not sample the downlink TDD communications signal during at least one uplink frame period of the TDD frame based on a received downlink reception control signal; and
a controller configured to;
detect an uplink/downlink TDD frame configuration of the TDD frame;
determine at least one uplink frame period in the TDD frame based on the detected uplink/downlink TDD frame configuration;
generate the uplink transmission control signal based on the determined at least one uplink frame period in the TDD frame; and
generate the downlink reception control signal based on the determined at least one uplink frame period in the TDD frame.
2 Assignments
0 Petitions
Accused Products
Abstract
Detecting uplink/downlink time-division duplexed (TDD) frame configurations in TDD communications signals to synchronize uplink communications from TDD communications units. In one example, embodiments disclosed herein involve detecting uplink/downlink time-division duplexed (TDD) frame configurations employed in downlink TDD communications signals transmitted from a TDD base station. The TDD base station may be configured to provide TDD communications according to a TDD frame to a distributed antenna system. The detected uplink/downlink TDD frame configuration of the downlink TDD communications signals can be used to determine time periods in the TDD frame when downlink communications transmissions are intended and uplink communications transmissions are intended. In this manner, a TDD distributed communications unit can synchronize transmission circuitry transmitting uplink TDD communications signals to the TDD base station in a different time slot(s) from reception of downlink TDD communication signals from the TDD base station to avoid or reduce data loss.
13 Citations
24 Claims
-
1. A time-division duplexed (TDD) communications unit, comprising:
-
a TDD communications signal interface configured to receive a downlink TDD communications signal and an uplink TDD communications signal over a communications medium; an uplink transmitter circuit coupled to the TDD communications signal interface, the uplink transmitter circuit configured to transmit the uplink TDD communications signal over the communications medium during at least one uplink frame period of a TDD frame based on a received uplink transmission control signal; a downlink receiver circuit coupled to the TDD communications signal interface, the downlink receiver circuit configured to be deactivated to not sample the downlink TDD communications signal during at least one uplink frame period of the TDD frame based on a received downlink reception control signal; and a controller configured to; detect an uplink/downlink TDD frame configuration of the TDD frame; determine at least one uplink frame period in the TDD frame based on the detected uplink/downlink TDD frame configuration; generate the uplink transmission control signal based on the determined at least one uplink frame period in the TDD frame; and generate the downlink reception control signal based on the determined at least one uplink frame period in the TDD frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method for synchronizing time-division duplexed (TDD) downlink and uplink communications with a TDD communications unit, comprising:
-
receiving a downlink TDD communications signal having a TDD frame; detecting an uplink/downlink TDD frame configuration of the TDD frame; determining at least one uplink frame period in the TDD frame based on the detected uplink/downlink TDD frame configuration; generating an uplink transmission control signal based on the determined at least one uplink frame period in the TDD frame; generating a downlink reception control signal based on the determined at least one uplink frame period in the TDD frame; transmitting an uplink TDD communications signal from an uplink transmitter circuit over a communications medium during the at least one uplink frame period in the TDD frame based on receiving the uplink transmission control signal; and deactivating a downlink receiver circuit to not sample the downlink TDD communications signal during at least one uplink frame period of the TDD frame based on receiving the downlink reception control signal. - View Dependent Claims (19, 20, 21, 22, 23)
-
-
24. A time-division domain (TDD) distributed antenna system, comprising:
-
a head-end unit, comprising; a first TDD communications signal interface configured to receive a downlink TDD communications signal over a communications medium from a base station and distribute the downlink TDD communications signal to a plurality of remote units; a second TDD communications interface configured to receive an uplink TDD communications signal from the plurality of remote units and distribute the received uplink TDD communications signal to the base station; an uplink transmitter circuit coupled to the first TDD communications signal interface, the uplink transmitter circuit configured to transmit the received uplink TDD communications signal from at least one distributed antenna system communications medium communicatively coupling a plurality of remote units to the head-end unit, over the communications medium to the base station during at least one uplink frame period of a TDD frame based on a received uplink transmission control signal; a downlink receiver circuit coupled to the first TDD communications signal interface, the downlink receiver circuit configured to be deactivated to not sample the downlink TDD communications signal during at least one uplink frame period of the TDD frame based on a received downlink reception control signal; and a controller configured to; detect an uplink/downlink TDD frame configuration of the TDD frame; determine at least one uplink frame period in the TDD frame based on the detected uplink/downlink TDD frame configuration; generate the uplink transmission control signal based on the determined at least one uplink frame period in the TDD frame; and generate the downlink reception control signal based on the determined at least one uplink frame period in the TDD frame; each of the plurality of remote units comprising; at least one antenna configured to receive the uplink TDD communications signal from at least one TDD client device; an uplink transmitter circuit configured to transmit the uplink TDD communications signal over the at least one distributed antenna system communications medium to the head-end unit during at least one uplink frame period of a TDD frame, based on a received uplink transmission control signal from the head-end unit; a downlink receiver circuit configured to be deactivated to not sample the downlink TDD communications signal received from the head-end unit over the at least one distributed antenna system communications medium during the at least one uplink frame period of the TDD frame, based on a received downlink reception control signal from the head-end unit.
-
Specification