Downlink Channel Configuration
A wireless device may receive radio resource control (RRC) messaging. The wireless device may receive a signal. The signal may be received via a physical downlink channel. The signal may start at a time that is based on a listen-before-talk (LBT) procedure, a starting symbol, and a non-zero offset symbol value.
1 . A method comprising:
receiving, by a wireless device, radio resource control (RRC) messaging associated with downlink transmission;
receiving, via a physical downlink channel, a signal that starts, at a time in a time duration, based on:
a listen-before-talk (LBT) procedure;
a starting symbol indicated in the RRC messaging; and
a non-zero offset symbol value indicated in the RRC messaging.
2 . The method of claim 1 , further comprising determining the non-zero offset symbol value based on a field, in the RRC messaging, that indicates one or more possible starting positions of transmission in the time duration.
3 . The method of claim 1 , wherein the non-zero offset symbol value corresponds to one slot of the time duration.
4 . The method of claim 1 , wherein the non-zero offset symbol value indicates a quantity of symbols associated with the time duration.
5 . The method of claim 1 , wherein the physical downlink channel is a physical downlink control channel (PDCCH).
6 . The method of claim 1 , wherein the physical downlink channel is a physical downlink shared channel (PDSCH).
7 . The method of claim 1 , wherein the non-zero offset symbol value is seven.
8 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive radio resource control (RRC) messaging associated with downlink transmission;
receive, via a physical downlink channel, a signal that starts, at a time in a time duration, based on:
a listen-before-talk (LBT) procedure;
a starting symbol indicated in the RRC messaging; and
a non-zero offset symbol value indicated in the RRC messaging.
9 . The wireless device of claim 8 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to determine the non-zero offset symbol value based on a field, in the RRC messaging, that indicates one or more possible starting positions of transmission in the time duration.
10 . The wireless device of claim 8 , wherein the non-zero offset symbol value corresponds to one slot of the time duration.
11 . The wireless device of claim 8 , wherein the non-zero offset symbol value indicates a quantity of symbols associated with the time duration.
12 . The wireless device of claim 8 , wherein the physical downlink channel is a physical downlink control channel (PDCCH).
13 . The wireless device of claim 8 , wherein the physical downlink channel is a physical downlink shared channel (PDSCH).
14 . The wireless device of claim 8 , wherein the non-zero offset symbol value is seven.
15 . A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to transmit radio resource control (RRC) messaging associated with downlink transmission; and
wherein the wireless device is configured to receive, via a physical downlink channel, a signal that starts, at a time in a time duration, based on:
a listen-before-talk (LBT) procedure;
a starting symbol indicated in the RRC messaging; and
a non-zero offset symbol value indicated in the RRC messaging.
16 . The system of claim 15 , wherein the wireless device is further configured to determine the non-zero offset symbol value based on a field, in the RRC messaging, that indicates one or more possible starting positions of transmission in the time duration.
17 . The system of claim 15 , wherein the non-zero offset symbol value corresponds to one slot of the time duration.
18 . The system of claim 15 , wherein the non-zero offset symbol value indicates a quantity of symbols associated with the time duration.
19 . The system of claim 15 , wherein the physical downlink channel is a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH).
20 . The system of claim 15 , wherein the non-zero offset symbol value is seven.