Timing advance management
AssigneeSamsung Electronics Co., Ltd.
InventorsShiyang Leng, Kyeongin Jeong
Life of this patent
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Abstract
Methods and apparatuses for a timing advance management for multi-TRP and beam management in a wireless communication system. A method of a UE comprises: receiving, from a first BS, a second TAG ID associated with a second BS and a PDCCH order; initiating a CFRA procedure in response to receiving the PDCCH order; transmitting, to a second BS, a RA preamble; receiving, for the second BS, a TAC included in a RAR or in a MAC CE; and applying the TAC and start a second time alignment timer corresponding to the second TAG ID associated with the second BS.
Claims20
A user equipment (UE) comprising:
- a transceiver configured to receive, from a first base station (BS), a second timing advance group (TAG) identifier (ID) for transmission configuration indicator (TCI) states associated with a second BS, a contention-free random access (CFRA) resource associated with the second BS, and a physical downlink control channel (PDCCH) order;
- and
- a processor operably coupled to the transceiver, the processor configured to initiate a CFRA procedure using the CFRA resource in response to receiving the PDCCH order,
- wherein the transceiver is further configured to:
- transmit, to the second BS, a random access (RA) preamble, and
- receive, for the second BS, a timing advance (TA) command (TAC) for the second TAG ID indicated in a random access response (RAR) or in a medium access control control element (MAC CE), and
- wherein the processor is further configured to apply the TAC and start a second time alignment timer corresponding to the second TAG ID associated with the second BS, and
- wherein the TAC is used for uplink (UL) transmissions using the TCI states associated with the second TAG ID.
A method of a user equipment (UE), the method comprising:
- receiving, from a first base station (BS), a second timing advance group (TAG) identifier (ID) for transmission configuration indicator (TCI) states associated with a second BS, a contention-free random access (CFRA) resource associated with the second BS, and a physical downlink control channel (PDCCH) order;
- initiating a CFRA procedure using the CFRA resource in response to receiving the PDCCH order;
- transmitting, to the second BS, a random access (RA) preamble;
- receiving, for the second BS, a timing advance (TA) command (TAC) for the second TAG ID indicated in a random access response (RAR) or in a medium access control control element (MAC CE);
- and
- applying the TAC and starting a second time alignment timer corresponding to the second TAG ID associated with the second BS,
- wherein the TAC is used for uplink (UL) transmissions using the TCI states associated with the second TAG ID.
A first base station (BS) comprising:
- a processor configured to generate a second timing advance group (TAG) identifier (ID) associated with a second BS and a physical downlink control channel (PDCCH) order;
- and
- a transceiver operably coupled to the processor, the transceiver configured to transmit, to a user equipment (UE), the second TAG ID for transmission configuration indicator (TCI) states associated with the second BS, a contention-free random access (CFRA) resource associated with the second BS, and the PDCCH order,
- wherein:
- a random access (RA) preamble is transmitted to the second BS based on a CFRA procedure using the CFRA resource in response to receiving the PDCCH order;
- a timing advance (TA) command (TAC) for the second TAG ID, for the second BS, indicated in a random access response (RAR) or in a medium access control control element (MAC CE), is applied;
- a second time alignment timer corresponding to the second TAG ID associated with the second BS is started;
- and
- the TAC is used for uplink (UL) transmissions using the TCI states associated with the second TAG ID.
Dependencies are inferred from the claim text.