Multi-level beam scheduling in a wireless communications circuit, particularly for a wireless communications system (WCS)
Multi-level beam scheduling in a wireless communications circuit, particularly for a wireless communications system (WCS), is disclosed. The WCS includes a central unit(s) and a wireless communications circuit(s) configured to reduce beamforming overhead and improve radio frequency (RF) coverage in a wireless communications cell(s) based on a multi-level beam scheduling scheme. In a non-limiting example, the multi-level beam scheduling scheme includes a first level (L1) scheduler, a second level (L2) scheduler, and a third level (L3) scheduler configured to perform cross-cell beam scheduling, in-cell beam scheduling, and in-beam user equipment (UE) scheduling, respectively. By employing the multi-level beam scheduling scheme in the WCS, it may be possible to reduce processing overhead and improve resource usage, data throughput, and system adaptability of the wireless communications circuit(s), thus helping to optimize capacity and throughput in the wireless communications cell(s).
1. A wireless communications circuit, comprising:
an antenna array configured to form a plurality of radio frequency (RF) beams in a plurality of time slots to radiate an RF communications signal to a plurality of user equipments (UEs) in a wireless communications cell;
a beam control circuit configured to:
determine at least one selected RF beam among the plurality of RF beams to be formed in a selected time slot among the plurality of time slots; and
cause the antenna array to form the at least one selected RF beam in the selected time slot; and
a signal control circuit configured to schedule one or more UEs among the plurality of UEs to communicate the RF communications signal via the at least one selected RF beam,
wherein the beam control circuit is further configured to:
receive a beam priority indication signal comprising one or more top priority weights corresponding to one or more prioritized RF beams, respectively, among the plurality RF beams;
generate a plurality of summed utilities corresponding to the plurality of RF beams, respectively; and
determine the at least one selected RF beam corresponding to a maximum summed utility among the plurality of summed utilities.
2. The wireless communications circuit of claim 1 , wherein the beam control circuit is further configured to receive the beam priority indication signal in each of the plurality of time slots.
3. The wireless communications circuit of claim 1 , wherein the signal control circuit is configured to schedule the one or more UEs among the plurality of UEs based on a UE scheduler selected from the group consisting of: a proportional fair scheduler, a round robin scheduler, and a quality-of-service (QoS) based scheduler.
4. The wireless communications circuit of claim 1 , wherein:
the signal control circuit is configured to schedule the one or more UEs among the plurality of UEs based on a proportional fair scheduler corresponding to a proportional metric; and
the beam control circuit is configured to generate the plurality of summed utilities based on the proportional metric and the one or more top priority weights indicated by the beam priority indication signal.
5. A method for performing multi-level beam scheduling in a wireless communications circuit, comprising:
radiating a radio frequency (RF) communications signal to a plurality of user equipments (UEs) in a wireless communications cell by forming a plurality of RF beams in a plurality of time slots;
determining at least one selected RF beam among the plurality of RF beams to be formed in a selected time slot among the plurality of time slots;
forming the at least one selected RF beam in the selected time slot;
scheduling one or more UEs among the plurality of UEs to communicate the RF communications signal via the at least one selected RF beam;
receiving a beam priority indication signal comprising one or more top priority weights corresponding to one or more prioritized RF beams, respectively, among the plurality RF beams;
generating a plurality of summed utilities corresponding to the plurality of RF beams, respectively; and
determining the at least one selected RF beam corresponding to a maximum summed utility among the plurality of summed utilities.
6. A wireless communications system (WCS), comprising:
at least one central unit; and
a plurality of remote units coupled to the at least one central unit via a plurality of communications mediums, the plurality of remote units configured to:
receive a plurality of downlink digital communications signals from the at least one central unit via the plurality of communications mediums, respectively;
convert the plurality of downlink digital communications signals into a plurality of downlink radio frequency (RF) communications signals, respectively;
distribute the plurality of downlink RF communications signals in a plurality of wireless communications cells, respectively;
receive a plurality of uplink RF communications signals from the plurality of wireless communications cells, respectively;
convert the plurality of uplink RF communications signals into a plurality of uplink digital communications signals, respectively; and
provide the plurality of uplink digital communications signals to the at least one central unit via the plurality of communications mediums, respectively;
wherein at least one remote unit among the plurality of remote units comprises:
an antenna array configured to form a plurality of RF beams in a plurality of time slots to radiate an RF communications signal among the plurality of downlink RF communications signals to a plurality of user equipments (UEs) in a wireless communications cell among the plurality of wireless communications cells;
a beam control circuit configured to:
determine at least one selected RF beam among the plurality of RF beams to be formed in a selected time slot among the plurality of time slots; and
cause the antenna array to form the at least one selected RF beam in the selected time slot; and
a signal control circuit configured to schedule one or more UEs among the plurality of UEs to communicate the RF communications signal via the at least one selected RF beam.
7. The WCS of claim 6 , wherein the at least one central unit is configured to:
generate a beam priority indication signal comprising one or more top priority weights corresponding to one or more prioritized RF beams, respectively, among the plurality RF beams; and
provide the beam priority indication signal to the beam control circuit in the at least one remote unit.
8. The WCS of claim 7 , wherein the beam control circuit is further configured to:
generate a plurality of summed utilities corresponding to the plurality of RF beams, respectively; and
determine the at least one selected RF beam corresponding to a maximum summed utility among the plurality of summed utilities.
9. The WCS of claim 8 , wherein the signal control circuit is further configured to schedule the one or more UEs among the plurality of UEs based on a UE scheduler selected from the group consisting of: a proportional fair scheduler, a round robin scheduler, and a quality-of-service (QoS) based scheduler.
10. The WCS of claim 8 , wherein:
the signal control circuit is further configured to schedule the one or more UEs among the plurality of UEs based on a proportional fair scheduler corresponding to a proportional metric; and
the beam control circuit is further configured to generate the plurality of summed utilities based on the proportional metric and the one or more top priority weights indicated by the beam priority indication signal.
11. The WCS of claim 7 , wherein:
the at least one central unit is further configured to support one or more higher layer networking protocols selected from the group consisting of: a packet data convergence protocol (PDCP), a radio resource management (RRC), a higher-layer (L3+) protocol comprising a transport control protocol (TCP) and an internet protocol (IP), and a self-organizing network (SON) protocol; and
the at least one remote unit is further configured to support one or more lower layer networking protocols selected from the group consisting of: a physical (PHY) protocol, a medium access control (MAC) protocol, and a radio link control (RLC) protocol.
12. The WCS of claim 7 , wherein the at least one central unit is further configured to generate the beam priority indication signal in each of the plurality of time slots.
13. The WCS of claim 6 , wherein:
the plurality of communications mediums corresponds to a plurality of optical fiber-based communications mediums, respectively;
the at least one central unit comprises:
a plurality of electrical-to-optical (E/O) converters configured to convert the plurality of downlink digital communications signals into a plurality of downlink optical communications signals for distribution to the plurality of remote units; and
a plurality of optical-to-electrical (O/E) converters configured to convert a plurality of uplink optical communications signals into the plurality of uplink digital communications signals; and
the plurality of remote units comprises:
a plurality of remote unit O/E converters configured to convert the plurality of downlink optical communications signals into the plurality of downlink digital communications signals; and
a plurality of remote unit E/O converters configured to convert the plurality of uplink digital communications signals into the plurality of uplink optical communications signals.