Methods and apparatus to schedule uplink transmissions in wireless communication systems

1. A method comprising:

measuring channel conditions for a plurality of user equipment devices at a base transceiver station of a wireless communication system;

dividing an operating bandwidth of the base transceiver station into two or more non-overlapping portions, wherein the operating bandwidth is divided based on the channel conditions; and

instructing a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval.

2. A method as defined in claim 1 , wherein the channel conditions comprise signal-to-interference and noise (SINK) values.

3. A method comprising:

measuring channel conditions for a plurality of user equipment devices at a base transceiver station of a wireless communication system;

dividing an operating bandwidth of the base transceiver station into two or more non-overlapping portions;

instructing a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval; and

performing at least one of frequency-domain channel-dependent scheduling or time-domain channel-dependent scheduling for a first subset of the plurality of user equipment devices within the first non-overlapping portion.

4. A method comprising:

measuring channel conditions for a plurality of user equipment devices at a base transceiver station of a wireless communication system;

dividing an operating bandwidth of the base transceiver station into two or more non-overlapping portions;

instructing a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval;

performing at least one of frequency-domain channel-dependent scheduling or time-domain channel-dependent scheduling for a first subset of the plurality of user equipment devices within the first non-overlapping portion; and

performing at least one of frequency-domain channel-dependent scheduling or time-domain channel-dependent scheduling for a second subset of the plurality of user equipment devices within a second non-overlapping portion.

5. A method comprising:

measuring channel conditions for a plurality of user equipment devices at a base transceiver station of a wireless communication system;

dividing an operating bandwidth of the base transceiver station into two or more non-overlapping portions;

instructing a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval; and

scheduling a data signal transmission for a first of the plurality of user equipment devices based on a corresponding sounding reference signal.

6. A method as defined in claim 5 , wherein the data signal transmission is to occur in the first non-overlapping portion.

7. A method comprising:

measuring channel conditions for a plurality of user equipment devices at a base transceiver station of a wireless communication system;

dividing an operating bandwidth of the base transceiver station into two or more non-overlapping portions;

instructing a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval;

scheduling a data signal transmission for a first of the plurality of user equipment devices based on a corresponding sounding reference signal; and

scheduling a second data signal transmission for a second of the plurality of user equipment devices based on a second corresponding sounding reference signal.

8. A method as defined in claim 7 , wherein the second data signal transmission is to occur in a second non-overlapping portion.

9. A method comprising:

measuring channel conditions for a plurality of user equipment devices at a base transceiver station of a wireless communication system;

dividing an operating bandwidth of the base transceiver station into two or more non-overlapping portions;

instructing a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval; and

assigning a first subset of the plurality of user equipment devices to the first non-overlapping portion based on the channel conditions measured at the base transceiver station.

10. A method comprising:

measuring channel conditions for a plurality of user equipment devices at a base transceiver station of a wireless communication system;

dividing an operating bandwidth of the base transceiver station into two or more non-overlapping portions, wherein dividing the operating bandwidth of the base transceiver station into the two or more non-overlapping portions comprises:

assigning each UE to a channel condition group based on its associated channel condition; and

determining a number of each size of the non-overlapping portions based on relative sizes of channel condition groups; and

instructing a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval.

11. A base transceiver station apparatus comprising:

a signal-to-interference and noise ratio (SINK) calculator to measure channel conditions for a plurality of user equipment devices of a wireless communication system;

a reference signal multiplexing block (RSMB) allocator to divide an operating bandwidth of the wireless communication system into two or more non-overlapping portions based on the measured channel conditions; and

a user equipment (UE) allocator to instruct a first of the plurality of user equipment devices to transmit a sounding reference signal in a first one of the non-overlapping portions during a sounding reference signal transmission interval; and

a scheduler to perform at least one of frequency-domain channel-dependent scheduling or time-domain channel-dependent scheduling of a data signal transmission for the first of the plurality of user equipment devices within the first non-overlapping portion.

12. An apparatus as defined in claim 11 , wherein the UE allocator is to assign a second of the plurality of user equipment devices to a second non-overlapping portion based on the measured channel conditions.

13. A base transceiver station apparatus comprising:

a signal-to-interference and noise ratio (SINR) calculator to measure channel conditions for a plurality of user equipment devices of a wireless communication system;

a reference signal multiplexing block (RSMB) allocator to divide an operating bandwidth of the wireless communication system into two or more non-overlapping portions based on the measured channel conditions; and

a user equipment (UE) allocator to instruct a first of the plurality of user equipment devices to transmit a sounding reference signal in a first one of the non-overlapping portions during a sounding reference signal transmission interval, wherein the UE allocator is to instruct a second of the plurality of user equipment devices to transmit a second sounding reference signal in the first non-overlapping portion during a sounding reference signal transmission interval.

14. An article of manufacture storing machine accessible instructions which, when executed, cause a machine to:

measure channel conditions for a plurality of equipment devices at a base transceiver station of a wireless communication system;

divide an operating bandwidth of the base transceiver station into at least two non-overlapping portions based on the measured channel conditions;

instruct a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval; and

perform at least one of frequency-domain channel-dependent scheduling or time-domain channel-dependent scheduling for a second subset of the plurality of user equipment devices within a second non-overlapping portion.

15. An article of manufacture storing machine accessible instructions which, when executed, cause a machine to:

measure channel conditions for a plurality of equipment devices at a base transceiver station of a wireless communication system;

divide an operating bandwidth of the base transceiver station into at least two non-overlapping portions based on the measured channel conditions;

instruct a first of the plurality of user equipment devices to transmit a sounding reference signal in a first non-overlapping portion during a sounding reference signal transmission interval; and

instructions, when executed, cause the machine to schedule a data signal transmission for the first of the plurality of user equipment devices based on the sounding reference signal.