RESOURCE CYCLE METHODOLOGY
Various aspects of the present disclosure relate to wireless communication. In some aspects, a user equipment (UE) may wake up at a subframe, wherein the subframe is identified by a subframe number and a system frame number (SFN), based on a discontinuous reception (DRX) cycle length, a DRX start offset, and an SFN wraparound offset. The SFN wraparound offset is based on a counter initialized according to a time reference SFN. The UE may receive downlink channels from the subframe during a DRX on duration. In further aspects, the UE may receive a configuration message specifying DRX parameters and the time reference SFN, and may operate according to multiple DRX configurations associated with different traffic flows. Numerous other aspects are described.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
wake up the apparatus starting at a subframe based at least in part on a specified index of the subframe, a discontinuous reception (DRX) cycle length, and a DRX start offset;
wherein the specified index of the subframe comprises a subframe number inside a radio frame, a system frame number (SFN) of the radio frame comprising the subframe, and an SFN wraparound offset, wherein the SFN wraparound offset is based on a counter initialized according to a time reference SFN; and
receive downlink channels from the subframe during a DRX on duration.
2 . The apparatus of claim 1 , wherein the SFN wraparound offset is equal to a length of a hyper frame multiplied by a counter m, and m is incremented by one when the SFN returns to a time reference SFN.
3 . The apparatus of claim 2 , wherein the length of the hyper frame is 10240.
4 . The apparatus of claim 1 , wherein the DRX start offset is configured by a network entity and is associated with a DRX configuration message.
5 . The apparatus of claim 1 , wherein the DRX cycle length is selected from a set of values compatible with a periodicity of multimedia data bursts.
6 . The apparatus of claim 1 , wherein the one or more processors are further configured to transmit an indication of a capability to use the SFN wraparound offset to a network entity.
7 . The apparatus of claim 1 , wherein the one or more processors are further configured to operate in a legacy DRX mode when the SFN wraparound offset is deactivated.
8 . An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive, from a network entity, a configuration message specifying a discontinuous reception (DRX) cycle length, DRX start offset, and system frame number (SFN) wraparound offset;
wake up the apparatus at a subframe based on the received configuration, wherein the SFN wraparound offset is based on a counter initialized according to a time reference SFN; and
receive downlink channels from the subframe during a DRX on duration.
9 . The apparatus of claim 8 , wherein the configuration message further specifies a time reference SFN for initializing the counter.
10 . The apparatus of claim 8 , wherein the DRX cycle length and DRX start offset are selected to align the DRX on duration with a periodicity of multimedia traffic.
11 . The apparatus of claim 8 , wherein the one or more processors are further configured to activate or deactivate the SFN wraparound offset based on radio resource control (RRC) signaling.
12 . The apparatus of claim 8 , wherein the one or more processors are further configured to reset the counter based on a configuration message or upon a specified event.
13 . The apparatus of claim 8 , wherein the one or more processors are further configured to receive, from the network entity, a configuration message specifying a set of supported DRX cycle lengths and corresponding start offsets for backward compatibility.
14 . An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
wake up the apparatus at a subframe when, for each of a plurality of discontinuous reception (DRX) configurations, the subframe is identified by a subframe number, a system frame number (SFN), and an SFN wraparound offset, wherein the SFN wraparound offset is based on a counter initialized according to a time reference SFN, and each DRX configuration includes a DRX cycle length and a DRX start offset; and
receive downlink channels from the subframe during a DRX on duration associated with the DRX configuration.
15 . The apparatus of claim 14 , wherein each DRX configuration is associated with a different multimedia traffic flow.
16 . The apparatus of claim 14 , wherein the one or more processors are further configured to update a DRX start offset for a DRX configuration in response to a change in traffic periodicity.
17 . The apparatus of claim 14 , wherein the DRX cycle length and DRX start offset for each DRX configuration are selected to maximize power saving and minimize delay for a multimedia traffic flow associated with the DRX configuration.
18 . The apparatus of claim 14 , wherein the one or more processors are further configured to determine the SFN wraparound offset based on a time reference SFN and a hyper frame length.
19 . The apparatus of claim 14 , wherein the one or more processors are further configured to reset the counter to zero based on a configuration message or upon a specified event.
20 . The apparatus of claim 14 , wherein the one or more processors are further configured to transmit an indication of a capability to use the SFN wraparound offset to a network entity.