Methods and systems for scheduling communications in a co-channel network
View Patent ↗At least one example embodiment discloses a method of scheduling communications for a user equipment (UE) in a co-channel heterogeneous network having a macro cell base station and a small cell base station. The method includes obtaining, by the macro cell base station, pre-scheduling information for transmissions to the UE based on measurements from the UE, the obtaining including, allocating resource blocks for the transmissions, the transmissions to the UE being from at least one of the macro cell base station and the small cell base station, and transmitting, by the macro cell base station, the pre-scheduling information to the small cell base station, the pre-scheduling information indicating first resource blocks for first transmissions from the macro cell base station and second resource blocks for second transmissions from the small cell base stations.
1. A method of scheduling communications for a user equipment (UE) in a co-channel heterogeneous network having a macro cell base station and a small cell base station, the method comprising:
obtaining, by the macro cell base station, pre-scheduling information for transmissions to the UE based on measurements from the UE, the obtaining including,
allocating resource blocks for the transmissions, the transmissions to the UE being from at least one of the macro cell base station and the small cell base station over the co-channel network;
transmitting, by the macro cell base station, the pre-scheduling information to the small cell base station, the pre-scheduling information indicating first resource blocks for first transmissions from the macro cell base station and second resource blocks for second transmissions from the small cell base station;
scheduling, by the macro cell base station, the first transmissions based on the pre-scheduling information and separate from scheduling by the small cell base station; and
transmitting, by the macro cell base station, a first data stream for the UE based on the scheduled first transmissions.
2. The method of claim 1 , further comprising:
transmitting a second data stream to the small cell base station based on the pre-scheduling information.
3. The method of claim 2 , further comprising:
receiving, by the macro cell base station, the first data stream based on a first link measurement of a first link between the UE and the macro cell base station and a second link measurement of a second link between the UE and the small cell base station, wherein the first link measurement is at least one of a channel condition, buffer condition, loading of the macro and small cell base stations, a location of the UE, a speed of the UE and data rate.
4. The method of claim 2 , further comprising:
determining an order of the first transmissions from the macro cell base station and the second transmissions from the small cell base stations.
5. The method of claim 2 , further comprising:
generating, by the macro cell base station, controlling and the pre-scheduling information;
splitting the controlling and the pre-scheduling information into first and second control streams;
transmitting the second control stream and control channel resource arrangement to the small cell base station; and
transmitting the first control stream to the UE based on the pre-scheduling information.
6. The method of claim 1 , further comprising:
generating, by the macro cell base station, controlling and the pre-scheduling information;
splitting the controlling and the pre-scheduling information into first and second control streams;
transmitting the second control stream to the small cell base station over a backhaul; and
transmitting the first control stream to the UE based on the pre-scheduling information.
7. The method of claim 1 , wherein the scheduling schedules the first transmissions based on the pre-scheduling information and conditions of a channel between the UE and the macro cell base station.
8. The method of claim 1 , further comprising:
receiving, by the macro cell base station, a second data stream for the UE; and
transmitting at least most of the second data stream to the small cell base station over a backhaul based on a measurement of a small cell reference signal reported by the UE.
9. The method of claim 8 , further comprising:
receiving, by the macro cell base station, signaling information;
transmitting the signaling information to the small cell base station over a backhaul when a location of the UE is in a small cell coverage area including a small cell range extension area and central area of the small cell.
10. The method of claim 1 , wherein the transmitting transmits the first data stream for the UE in coordination with a second data stream from the small cell base station based on the pre-scheduling information.
11. The method of claim 10 , further comprising:
receiving one of an acknowledgement and negative acknowledgement from the UE over an uplink channel, the uplink channel being used by the macro cell base station and the small cell base station to receive information from the UE.
12. The method of claim 11 , further comprising:
retransmitting the first data in response to a negative acknowledgement using one of the first resource blocks.
13. The method of claim 1 , further comprising:
blocking transmissions in the second resource blocks.
14. The method of claim 1 , wherein the obtaining obtains the pre-scheduling information based on a backhaul delay between the macro cell base station and the small cell base station and an information processing delay of the small cell base station.
15. A method of scheduling communications for a user equipment (UE) in a co-channel heterogeneous network having a macro cell base station and a small cell base station, the method comprising:
receiving, by the small cell base station, pre-scheduling information from the macro cell base station, the pre-scheduling information indicating first resource blocks for first transmissions from the macro cell base station over the co-channel network and second resource blocks for second transmissions from the small cell base stations over the co-channel network;
receiving, by the small cell base station, data for the UE from a serving gateway of the network;
scheduling, by the small cell base station, the second transmissions based on the pre-scheduling information and separate from scheduling by the macro cell base station; and
transmitting the data to the UE based on the scheduling.
16. The method of claim 15 , further comprising:
receiving, by the small cell base station, signaling information from the macro cell base station; and
transmitting the signaling information to the UE based on the pre-scheduling information.
17. The method of claim 16 , further comprising:
receiving, by the small cell base station, data for the UE from the macro cell base station; and
transmitting the data from the macro cell to the UE based on the pre-scheduling information.
18. The method of claim 17 , wherein the transmitting is based on a delay allowed for the small cell base station to processing the received pre-scheduling information over the backhaul.
19. The method of claim 17 , further comprising:
receiving one of an acknowledgement and negative acknowledgement from the UE over a control channel, the channel being used by both the macro cell base station and the small cell base station to receive responses from the UE.
20. The method of claim 19 , further comprising:
transmitting a response to the one of the acknowledgement and negative acknowledgement using one of the second resource blocks.
21. The method of claim 15 , further comprising:
blocking transmissions in the first resource blocks.