Mobility improvements for wireless communication networks
According to an example aspect of the present invention, there is provided a method comprising, receiving from a first Transmission and Reception Point, by a user equipment, an indication of a primary set of Transmission Configuration Indication, TCI, states associated with an index and an indication of a secondary set of TCI states associated with the index, wherein the primary set of TCI states is usable for receiving data from the first TRP and the secondary set of TCI states is usable for receiving data from a second TRP, configuring a receiver of the user equipment to receive data from the first TRP in accordance with the primary set of TCI states and receiving, by the user equipment, a mobility trigger and configuring the receiver of the user equipment to receive data from the second TRP in accordance with the secondary set of TCI states upon receiving the mobility trigger.
1 . A method, comprising: receiving from a first Transmission and Reception Point (TRP), by a user equipment, an indication of a primary set of Transmission Configuration Indication (TCI) states associated with an index and an indication of a secondary set of TCI states associated with the index, wherein the primary set of TCI states is usable for receiving data from the first TRP and the secondary set of TCI states is usable for receiving data from a second TRP; configuring a receiver of the user equipment to receive data from the first TRP in accordance with the primary set of TCI states; and receiving, by the user equipment, a mobility trigger and configuring the receiver of the user equipment to receive data from the second TRP in accordance with the secondary set of TCI states upon receiving the mobility trigger; wherein the mobility trigger is based on implicit signalling, wherein the implicit mobility trigger is based on another information field received within downlink control information, wherein an indication within said another information field works as the mobility trigger only when there is the secondary set of TCI states, and wherein the indication within said another information field is a TCI state belonging to the primary set of TCI states and the secondary set of TCI states.
2 . A method, comprising: transmitting to a user equipment, by a first Transmission and Reception Point (TRP), an indication of a primary set of Transmission Configuration Indication (TCI) states associated with an index and an indication of a secondary set of TCI states associated with the index, wherein the primary set of TCI states is usable for receiving data from the first TRP and the secondary set of TCI states is usable for receiving data from a second TRP; determining that there is a need to switch the user equipment from the first TRP to the second TRP; and transmitting a mobility trigger to the user equipment, to configure a receiver of the user equipment to receive data from the second TRP in accordance with the secondary set of TCI states upon receiving the mobility trigger; wherein the mobility trigger is based on implicit signalling, wherein the implicit mobility trigger is based on another information field received within downlink control information, wherein an indication within said another information field works as the mobility trigger only when there is the secondary set of TCI states.
3 . The method according to claim 2 , wherein at least a part of the primary set of TCI states is different compared to the secondary set of TCI states.
4 . The method according to claim 2 , wherein the secondary set of TCI states is not to be used to receive data by the user equipment before receiving the mobility trigger.
5 . The method according to claim 2 , wherein the primary set of TCI states and the secondary set of TCI states are not to be used at the same time.
6 . The method according to claim 2 , wherein the same index is associated with the first TRP and the second TRP.
7 . The method according to claim 2 , wherein the index is a control resource set pool index which is used to differentiate a set of control resources used by the first TRP and a third TRP.
8 . The method according to claim 2 , further comprising:
transmitting, by the first TRP, a parameter in downlink control information to the user equipment, wherein the parameter is related to the mobility trigger when the secondary set of TCI indication states is activated.
9 . The method according to claim 2 , wherein the indication within the another information field is a TCI state belonging to the primary set of TCI states and the secondary set of TCI states.