Proactive PUSCH grants to prevent rate throttling
One embodiment is directed to transmitting user data to a UE from a base station on a shared downlink channel and determining if a throughput for the user data transmitted to the UE on the shared downlink channel is greater than a threshold amount. If the throughput for the user data transmitted to the UE on the shared downlink channel is greater than the threshold amount, the base station provides the UE with a minimum amount of access to a shared uplink channel by making proactive grants of uplink resources when such UE is more in need of a proactive grant than other UEs. Other embodiments are disclosed.
1. A method performed by a base station in connection with communicating with user equipment (UE), the method comprising:
transmitting user data to the UE from the base station on a shared downlink channel;
determining if a throughput for the user data transmitted to the UE on the shared downlink channel is greater than a threshold amount; and
if the throughput for the user data transmitted to the UE on the shared downlink channel is greater than the threshold amount, providing, by the base station, the UE with a minimum amount of access to a shared uplink channel by making proactive grants of uplink resources when necessary.
2. The method of claim 1 , wherein the user data transmitted to the UE comprises user data for a Transmission Control Protocol (TCP) connection.
3. The method of claim 1 , wherein the UE is provided with the minimum amount of access to the shared uplink channel to enable the UE to transmit acknowledgments on the shared uplink channel.
4. The method of claim 1 , wherein the proactive grant is made by the base station without the UE making, and without the base station receiving, a scheduling request for uplink resources on the shared uplink channel.
5. The method of claim 1 , wherein the shared downlink channel comprises a LTE Physical Downlink Shared Channel (PDSCH), and the shared uplink channel comprises a LTE Physical Uplink Shared Channel (PUSCH).
6. The method of claim 1 , wherein the uplink resources on the shared uplink channel comprise at least one of: a modulation coding scheme (MCS) and physical resource blocks (PRBs) for transmitting on the shared uplink channel.
7. The method of claim 1 , wherein the base station signals each proactive grant by sending the UE a DCI0 message on an LTE Physical Downlink Control Channel (PDCCH).
8. The method of claim 1 , wherein the minimum of amount of access to the shared uplink channel is determined as a function of an amount of time since a most recent grant of, or scheduling request (SR) opportunity for, the shared channel uplink for the UE.
9. The method of claim 1 , wherein the threshold amount of downlink throughput is set to identify situations where the UE is communicating using a Transmission Control Protocol (TCP) connection at a rate high enough that the TCP connection may be throttled; and
wherein the minimum of amount of access to the shared uplink channel is provided in order to avoid throttling of the TCP connection.
10. A method performed by a base station used to wirelessly communicate with user equipment using a shared downlink channel and a shared uplink channel, the method comprising:
transmitting respective user data to each UE from the base station on the shared downlink channel;
determining, by the base station, a respective average throughput for the respective user data transmitted on the shared downlink channel to each UE;
determining, by the base station, if the respective average throughput for each UE exceeds a predetermined throughput threshold;
for each UE for which the respective average throughput exceeds the predetermined throughput threshold, determining, by the base station, a number of time transmission intervals (TTIs) that have passed since a most recent grant of, or scheduling request (SR) opportunity for, uplink resources on the shared uplink channel for the UE;
determining, by the base station, which UE has a largest said number of TTIs;
determining, by the base station, if the largest said number of TTIs is greater than a threshold number of TTIs; and
if the largest said number of TTIs is greater than a threshold number of TTIs, making, by the base station to the UE associated with the largest said number of TTIs, a proactive grant of uplink resources on the shared uplink channel.
11. The method of claim 10 , wherein determining, by the base station, the average throughput on the shared downlink channel for each UE comprises calculating an average throughput supplied on the shared downlink channel to each UE over a predetermined number of TTIs.
12. The method of claim 10 , wherein the user data transmitted to at least one UE comprises user data for a Transmission Control Protocol (TCP) connection.
13. The method of claim 10 , wherein the proactive grant of uplink resources on the shared uplink channel is made to enable the UE associated with the largest said number of TTIs to transmit acknowledgments on the shared uplink channel.
14. The method of claim 10 , wherein the proactive grant is made by the base station without the UE associated with the largest said number of TTIs making, and without the base station receiving, a scheduling request for uplink resources on the shared uplink channel.
15. The method of claim 10 , wherein the shared downlink channel comprises a LTE Physical Downlink Shared Channel (PDSCH), and the shared uplink channel comprises a LTE Physical Uplink Shared Channel (PUSCH).
16. The method of claim 10 , wherein the uplink resources on the shared uplink channel comprise at least one of: a modulation coding scheme (MCS) and physical resource blocks (PRBs) for transmitting on the shared uplink channel.
17. The method of claim 10 , wherein the base station signals each proactive grant by sending a DCI0 message on an LTE Physical Downlink Control Channel (PDCCH).
18. A base station configured to wirelessly communicate with user equipment (UE), the base station comprising:
a radio configured to wirelessly communicate with the UE;
at least one processor configured to cause the base station to do the following:
transmit user data to the UE from the base station on a shared downlink channel;
determine if a throughput for the user data transmitted to the UE on the shared downlink channel is greater than a threshold amount; and
if the throughput for the user data transmitted to the UE on the shared downlink channel is greater than the threshold amount, provide the UE with a minimum amount of access to a shared uplink channel by making proactive grants of uplink resources when necessary.
19. The base station of claim 18 , wherein the user data transmitted to the UE comprises user data for a Transmission Control Protocol (TCP) connection.
20. The base station of claim 18 , wherein the processor is configured to cause the base station to provide the UE with the minimum amount of access to the shared uplink channel to enable the UE to transmit acknowledgments on the shared uplink channel.
21. The base station of claim 18 , wherein the processor is configured to cause the base station to make the proactive grant without the UE making, and without the base station receiving, a scheduling request for uplink resources on the shared uplink channel.
22. The base station of claim 18 , wherein the shared downlink channel comprises a LTE Physical Downlink Shared Channel (PDSCH), and the shared uplink channel comprises a LTE Physical Uplink Shared Channel (PUSCH).
23. The base station of claim 18 , wherein the uplink resources on the shared uplink channel comprise at least one of: a modulation coding scheme (MCS) and physical resource blocks (PRBs) for transmitting on the shared uplink channel.
24. The base station of claim 18 , wherein the processor is configured to cause the base station to signal each proactive grant by sending the UE a DCI0 message on an LTE Physical Downlink Control Channel (PDCCH).
25. The base station of claim 18 , wherein the processor is configured to cause the base station to determine the minimum of amount of access to the shared uplink channel as a function of an amount of time since a most recent of a grant of or scheduling request (SR) opportunity for uplink resources for the UE.
26. The base station of claim 18 , wherein the processor is configured to cause the base station to set the threshold amount of throughput to identify situations where the UE is communicating using a Transmission Control Protocol (TCP) connection at a rate high enough that the TCP connection may be throttled; and
wherein the processor is configured to cause the base station to determine the minimum of amount of access to the shared uplink channel to avoid throttling of the TCP connection.
27. A base station configured to wirelessly communicate with user equipment (UE) using a shared downlink channel and a shared uplink channel, the base station comprising:
a radio configured to wirelessly communicate with the UE;
at least one processor configured to cause the base station to do the following:
transmit respective user data to each UE from the base station on the shared downlink channel;
determine a respective average throughput for the respective user data transmitted on the shared downlink channel to each UE;
determine if the respective average throughput for each UE exceeds a predetermined throughput threshold;
for each UE for which the respective average throughput exceeds the predetermined throughput threshold, determine a number of time transmission intervals (TTIs) that have passed since a most recent of a grant of, or scheduling request (SR) opportunity for, uplink resources on the shared uplink channel for the UE;
determine which UE has a largest said number of TTIs;
determine if the largest said number of TTIs is greater than a threshold number of TTIs; and
if the largest said number of TTIs is greater than a threshold number of TTIs, make, to the UE associated with the largest said number of TTIs, a proactive grant of uplink resources on the shared uplink channel.
28. The base station of claim 27 , wherein the processor is configured to cause the base station to determine the average throughput on the shared downlink channel for each UE comprises by calculating an average throughput supplied on the shared downlink channel to each UE over a predetermined number of TTIs.
29. The base station of claim 27 , wherein the user data transmitted to at least one UE comprises user data for a Transmission Control Protocol (TCP) connection.
30. The base station of claim 27 , wherein the processor is configured to cause the base station to make the proactive grant of uplink resources on the shared uplink channel in order to enable the UE associated with the largest said number of TTIs to transmit acknowledgments on the shared uplink channel.
31. The base station of claim 27 , wherein the processor is configured to cause the base station to make the proactive grant without the UE associated with the largest said number of TTIs making, and without the base station receiving, a scheduling request for uplink resources on the shared uplink channel.
32. The base station of claim 27 , wherein the shared downlink channel comprises a LTE Physical Downlink Shared Channel (PDSCH), and the shared uplink channel comprises a LTE Physical Uplink Shared Channel (PUSCH).
33. The base station of claim 27 , wherein the uplink resources on the shared uplink channel comprise at least one of: a modulation coding scheme (MCS) and physical resource blocks (PRBs) for transmitting on the shared uplink channel.
34. The base station of claim 27 , wherein the processor is configured to cause the base station to signal each proactive grant by sending a DCI0 message on an LTE Physical Downlink Control Channel (PDCCH).