Enhanced uplink operation in soft handover
A method, wireless transmit/receive unit (WTRU), and a wireless network node configured for wireless communications comprising receiving, by the WTRU, configuration information for a primary cell and one or more non-primary cells, receiving, by the WTRU, a message on the primary cell, the received message including indication of at least one of the one or more non-primary cells from which the WTRU is to receive a downlink shared channel transmission, and in response to the received message, receiving and processing, by the WTRU, the downlink shared channel transmission from the indicated at least one of the one or more non-primary cells.
1. A wireless transmit/receive unit (WTRU) comprising:
a transceiver; and
a processor; and
wherein the transceiver and the processor are configured to cause the WTRU to, while a primary cell is associated with a wireless network node and one or more non-primary cells are associated with the wireless network node:
receive configuration information for the primary cell and the one or more non-primary cells;
receive a message on the primary cell, the received message including an indication of at least one of the one or more non-primary cells from which the WTRU is to receive a downlink shared channel transmission; and
in response to the received message, receive and process the downlink shared channel transmission from the indicated at least one of the one or more non-primary cells.
2. The WTRU of claim 1 wherein there is a time delay between the downlink shared channel transmission and the receipt of the message by the WTRU.
3. The WTRU of claim 1 wherein the transceiver and the processor are further configured to cause the WTRU to, in response to the received message, monitor downlink channels of only the primary cell for the message.
4. The WTRU of claim 1 wherein the transceiver and the processor are further configured to cause the WTRU to monitor a plurality of downlink control channels for the message.
5. The WTRU of claim 1 wherein the transceiver and the processor are further configured to cause the WTRU to receive a grant for an uplink transmission from the primary cell and to transmit the uplink transmission based on the received grant.
6. The WTRU of claim 5 wherein the transceiver and the processor are further configured to cause the WTRU to process an acknowledgement/negative acknowledgement to the uplink transmission received only from the primary cell.
7. A method comprising:
receiving, by a wireless transmit/receive unit (WTRU), configuration information for a primary cell and one or more non-primary cells, wherein the primary cell is associated with a wireless network node and the one or more non-primary cells are associated with the wireless network node;
receiving, by the WTRU, a message on the primary cell, the received message including indication of at least one of the one or more non-primary cells from which the WTRU is to receive a downlink shared channel transmission; and
in response to the received message, receiving and processing, by the WTRU, the downlink shared channel transmission from the indicated at least one of the one or more non-primary cells.
8. The method of claim 7 wherein there is a time delay between the downlink shared channel transmission and the receipt of the message by the WTRU.
9. The method of claim 7 wherein the WTRU, in response to the received message, monitors downlink channels of only the primary cell for the message.
10. The method of claim 7 wherein the WTRU monitors a plurality of downlink control channels for the message.
11. The method of claim 7 further comprising receiving, by the WTRU, a grant for an uplink transmission from the primary cell and transmitting, by the WTRU, the uplink transmission based on the received grant.
12. The method of claim 11 further comprising processing, by the WTRU, an acknowledgement/negative acknowledgement to the uplink transmission received only from the primary cell.
13. A wireless network node comprising:
a transceiver; and
a processor; and
wherein the transceiver and the processor are configured to cause the wireless network node to, while a primary cell is associated with the wireless network node and one or more non-primary cells are associated with the wireless network node:
transmit, to a wireless transmit/receive unit (WTRU), configuration information for the primary cell and the one or more non-primary cells; and
transmit, to the WTRU, a message on the primary cell, the transmitted message including an indication of at least one of the one or more non-primary cells that a downlink shared channel transmission is scheduled.
14. The wireless network node of claim 13 wherein the transceiver and the processor are configured to cause the wireless network node to transmit the downlink shared channel transmission on the indicated at least one of the one or more non-primary cells.
15. The wireless network node of claim 13 wherein there is a time delay between the downlink shared channel transmission and the transmitted message.
16. The wireless network node of claim 13 wherein the transceiver and the processor are configured to cause the wireless network node to transmit a grant for an uplink transmission from the primary cell and to receive the uplink transmission based on the grant.
17. The wireless network node of claim 16 wherein the transceiver and the processor are configured to cause the wireless network node to transmit an acknowledgement/negative acknowledgement to the uplink transmission only on the primary cell.