Method of sharing a UE receiver between D2D and cellular operations based on activity
Systems and methods are disclosed for utilizing non-overlapping time periods within one or more Discontinuous Reception (DRX) cycles configured for a Device-to-Device (D2D) capable wireless device for different types of operations. In some embodiments, these different types of operations are cellular and D2D operations such that the D2D capable wireless device performs cellular and D2D operations (e.g., reception of cellular and D2D signals) during non-overlapping time periods during one or more DRX cycles. In this manner, a D2D capable wireless device that, for example, can only receive one type of signal at a time is enabled to receive both cellular and D2D signals.
1. A network node of a cellular communications network, comprising:
a processing module; and
a memory module storing instructions executable by the processing module whereby the network node is operable to:
determine one or more Discontinuous Reception, DRX, sharing rules for a wireless device, the one or more DRX sharing rules defining non-overlapping time periods within one or more DRX cycles to be used by the wireless device for cellular and Device-to-Device, D2D, operations where the non-overlapping time periods comprise a first time period to be used by the wireless device for cellular operation and a second time period for D2D operations and each of the first time period and the second time period occur within a DRX ON duration; and
configure the wireless device with the one or more DRX sharing rules.
2. The network node of claim 1 wherein, via execution of the instructions by the processing module, the network node is further operable to dynamically adapt the one or more DRX sharing rules for the wireless device.
3. The network node of claim 1 the one or more DRX sharing rules comprise a rule that the first time period is a first DRX ON duration of a first DRX cycle and the second time period is a second DRX ON duration of a second DRX cycle.
4. The network node of claim 1 wherein the one or more DRX sharing rules comprise a rule that the first time period and the second time period are non-overlapping time periods within the same DRX ON duration of a DRX cycle.
5. The network node of claim 1 wherein the one or more DRX sharing rules comprise a rule that the first time period and the second time period are configured such that the first time period and the second time period are separated in time by a time, t, for which one or both of the following condition holds:
T min≤ t≤T max,
where Tmin is a predefined minimum amount of time and Tmax is a predefined maximum amount of time.
6. The network node of claim 1 wherein the one or more DRX sharing rules comprise a rule that the first time period and the second time period are configured such that a predefined order is maintained between the first time period and the second time period.
7. The network node of claim 1 wherein the network node determines the one or more DRX sharing rules for the wireless device based on one or more criteria, the one or more criteria comprising at least one of the group consisting of:
an amount of cellular and/or D2D traffic;
battery life and/or power consumption of the wireless device;
DRX cycle length;
length of ON duration;
occasions of D2D operations;
receiver capability of the wireless device; and
activity state of the wireless device.
8. A method of operation of a network node of a cellular communications network, comprising:
determining one or more Discontinuous Reception, DRX, sharing rules for a wireless device, the one or more DRX sharing rules defining non-overlapping time periods within one or more DRX cycles to be used by the wireless device for cellular and Device-to-Device, D2D, operations where the non-overlapping time periods comprise a first time period to be used by the wireless device for cellular operation and a second time period for D2D operations and each of the first time period and the second time period occur within a DRX ON duration; and
configuring the wireless device with the one or more DRX sharing rules.
9. A network node of a cellular communications network, comprising:
a processing module; and
a memory module storing instructions executable by the processing module whereby the network node is operable to:
determine that a wireless device is configured or is being configured in Discontinuous Reception, DRX, for receiving Device-to-Device, D2D, and/or cellular signals;
determine that the wireless device is sharing or is expected to share time during one or more DRX cycles for D2D operation and cellular operation where sharing involves non-overlapping time periods within the one or more DRX cycles to be used by the wireless device for cellular and Device-to-Device, D2D, operations where the non-overlapping time periods comprise a first time period to be used by the wireless device for cellular operation and a second time period for D2D operations; and
upon determining that the wireless device is configured or is being configured in DRX for receiving the D2D and/or cellular signals and determining that the wireless device is sharing or is expected to share time during the one or more DRX cycles for D2D operation and cellular operation, adapt an existing DRX cycle configuration or configure a new DRX cycle to enable the wireless device to share time during the one or more DRX cycles for D2D operation and cellular operation.
10. The network node of claim 9 wherein adaptation of the existing DRX cycle configuration or configuration of the new DRX cycle comprises adaptation of a DRX ON duration of the one or more DRX cycles.
11. The network node of claim 9 wherein the adaptation of the existing DRX cycle configuration or configuration of the new DRX cycle is based on one or more criteria comprising at least occasions of D2D operations.
12. The network node of claim 9 wherein adaptation of the existing DRX cycle configuration or configuration of the new DRX cycle comprises adaptation of at least one of a predefined minimum amount of time and a predefined maximum amount of time between non-overlapping time periods within the one or more DRX cycles for D2D and cellular operations.
13. The network node of claim 9 wherein adaptation of the existing DRX cycle configuration or configuration of the new DRX cycle comprises adaptation of an ordering of non-overlapping time periods within one or more DRX cycles for D2D and cellular operations.
14. A method of operation of a network node of a cellular communications network, comprising:
determining that a wireless device is configured or is being configured in Discontinuous Reception, DRX, for receiving Device-to-Device, D2D, and/or cellular signals;
determining that the wireless device is sharing or is expected to share time during one or more DRX cycles for D2D operation and cellular operation where sharing involves non-overlapping time periods within the one or more DRX cycles to be used by the wireless device for cellular and Device-to-Device, D2D, operations where the non-overlapping time periods comprise a first time period to be used by the wireless device for cellular operation and a second time period for D2D operations; and
adapting an existing DRX cycle configuration or configure a new DRX cycle based on one or more criteria to enable the wireless device to share time during one or more DRX cycles for D2D operation and cellular operation.