Transmission Modes and Signaling for Uplink MIMO Support or Single TB Dual-Layer Transmission in LTE Uplink
This invention is a method of wireless telephony. A bases station configures a user equipment for single-antenna port or multi-antenna port operation via Radio Resource Control (RRC) signaling including a 5-bit MCS-RV and 1-bit NDI for the second codeword (CW1) are needed for the DCI format 4.
1 . A method of wireless telephony between at least one fixed base station and at least one mobile user equipment comprising the steps of:
defining a default mode of one of said at least one user equipment transmitting to a corresponding fixed base station via a single-antenna port;
defining a multi-antenna-port mode of one of said at least one user equipment transmitting to a corresponding fixed base station via a multi-antenna port;
transmitting a mode identifying signal from a fixed base station to one of said at least one user equipment specifying said default mode or said multi-antenna-port mode; and
said one of said at least one user equipment transmitting to said corresponding fixed base station via a mode specified by said fixed base station on a Physical Uplink Shared CHannel.
2 . The method of claim 1 , wherein:
said step of transmitting a mode identifying signal uses Radio Resource Control (RRC) signaling.
3 . The method of claim 2 , wherein:
said step of transmitting a mode identifying signal employs a 5-bit MCS-RV and 1-bit NDI for the second codeword (CW 1 ) are needed for the DCI format 4.
4 . The method of claim 3 , wherein:
said step of transmitting a mode identifying signal employs a precoding information field represents joint encoding of transmit rank indicator (TRI) and transmit precoding matrix indicator (TPMI).
5 . The method of claim 4 , wherein:
said joint encoding of TRI and TPMI has 3 bits for two transmitter ports.
6 . The method of claim 4 , wherein:
said joint encoding of TRI and TPMI has 6 bits for four transmitter ports.
7 . The method of claim 4 , wherein:
said joint encoding of TRI and TPMI has a 1-bit TB-to-CW swap flag.
8 . The method of claim 1 , wherein:
said step of transmitting a mode identifying signal employs a selected number of one or two transport blocks (TBs).
9 . The method of claim 8 , wherein:
a TB may be enabled or disabled.
10 . The method of claim 8 , wherein:
said step of transmitting a mode identifying signal enables or disables a selected TB when a transmit rank indicator (TRI) is 1 via a state of a TB-to-CW swap flag.
11 . The method of claim 8 , wherein:
said step of transmitting a mode identifying signal cannot enable or disable a TB when a transmit rank indicator (TRI) is greater than 1.