Timing advance for TSN
Methods for aligning sending of a network system clock time to a wireless device with initiating a propagation delay compensation procedure for the wireless device. An example method, in a network node, comprises determining that a propagation delay compensation procedure for the wireless device is to be initiated or has been initiated, and sending an indication of a network system clock time to the wireless device in association with the propagation delay compensation procedure.
1. A method, in a network node, for aligning sending of a network system clock time to a wireless device with initiating a propagation delay compensation procedure for the wireless device, the method comprising:
determining that a propagation delay compensation procedure to adjust uplink transmission timing for the wireless device is to be initiated or has been initiated;
and, responsive to said determining, sending an indication of a network system clock time to the wireless device in association with the propagation delay compensation procedure;
wherein the propagation delay compensation procedure comprises a timing advance procedure and wherein the method further comprises:
determining that the wireless device is able to receive enhanced timing advance values, the enhanced timing advance values reflecting smaller variations in uplink synchronization than provided to wireless devices unable to receive enhanced timing advance values; and
providing the wireless device with an enhanced timing advance value as part of the timing advance procedure.
2. The method of claim 1 , wherein said determining is based on one or both of the following:
a periodic indication that the propagation delay compensation procedure is to be initiated; and
detecting that uplink synchronization for the wireless device deviates from a nominal synchronization level by at least a predetermined amount.
3. The method of claim 1 , wherein the propagation delay compensation procedure is based on measurements of both uplink reference signals and downlink reference signals.
4. The method of claim 1 , wherein the method comprises providing the indication of the network system clock time in signaling used to perform the timing advance procedure or in signaling sent along with performing the timing advance procedure.
5. The method of claim 4 , wherein the method comprises providing the indication of the network system clock time in signaling used to perform the timing advance procedure.
6. The method of claim 1 , wherein the indication of the network system clock time is sent in a Radio Resource Configuration (RRC) message, and wherein the method comprises performing the timing advance procedure in association with sending the RRC message.
7. The method of claim 1 , wherein the network system clock time is a 5G network system time.
8. A method, in a wireless device, for aligning reception of a network system clock time from a network node with a propagation delay compensation procedure, the method comprising:
receiving an indication of a network system clock time from the network node; and
performing a propagation delay compensation procedure to adjust uplink transmission timing for the wireless device in association with receiving said indication;
wherein the propagation delay compensation procedure comprises a timing advance procedure, and wherein the method further comprises receiving an enhanced timing advance value as part of the timing advance procedure, the enhanced timing advance value reflecting smaller variations in uplink synchronization than provided to wireless devices unable to receive enhanced timing advance values.
9. The method of claim 8 , wherein the method comprises:
detecting a change in channel conditions that affects timing;
triggering the timing advance procedure in response to said detecting; and
receiving the indication of the network system clock time in signaling used to perform the timing advance procedure or in signaling sent along with performing the timing advance procedure.
10. The method of claim 9 , wherein the method comprises receiving the indication of the network system clock time in signaling used to perform the timing advance procedure.
11. The method of claim 8 , wherein the propagation delay compensation procedure is based on measurements of both uplink reference signals and downlink reference signals.
12. The method of claim 8 , wherein the indication of the network system clock time is received in a Radio Resource Configuration (RRC) message, and wherein the method comprises performing the timing advance procedure in association with receiving the RRC message.
13. The method of claim 8 , wherein the network system clock time is a 5 G network system time.
14. A wireless device configured to operate in a wireless network, the wireless device comprising:
radio front end circuitry configured to communicate with a network node via at least one cell; and
processing circuitry connectable to the radio front end circuitry, whereby the processing circuitry and the radio front end circuitry are configured to perform operations corresponding to the method of claim 8 .
15. A non-transitory, computer-readable medium storing computer- executable instructions that, when executed by processing circuitry of a wireless device, configure the wireless device to perform operations corresponding to the method of claim 8 .
16. A network node configured to serve at least one cell in a wireless network, the network node comprising:
radio front end circuitry configured to communicate with a wireless device via the at least one cell; and
processing circuitry connectable to the radio front end circuitry, whereby the processing circuitry and the radio front end circuitry are configured to:
determine that a propagation delay compensation procedure to adjust uplink transmission timing for the wireless device is to be initiated or has been initiated; and,
responsive to said determining, send an indication of a network system clock time to the wireless device in association with the propagation delay compensation procedure;
wherein the propagation delay compensation procedure comprises a timing advance procedure and wherein the processing circuitry and the radio front end circuitry are further configured to:
determine that the wireless device is able to receive enhanced timing advance values, the enhanced timing advance values reflecting smaller variations in uplink synchronization than provided to wireless devices unable to receive enhanced timing advance values; and
provide the wireless device with an enhanced timing advance value as part of the timing advance procedure.
17. A non-transitory, computer-readable medium storing computer-executable instructions that, when executed by processing circuitry of a network node, configure the network node to perform operations corresponding to the method of claim 1 .