Load power consumption management in discontinuous reception

• US 10,028,330 B2
• Filed: 08/05/2015
• Issued: 07/17/2018
• Est. Priority Date: 08/07/2014
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Cheng, Jung-Fu, Falahati, Sorour, Koorapaty, Havish, Larsson, Daniel
• Primary Examiner(s): CATTUNGAL, AJAY P
• Application Number:
  US15/328,534
• Publication Number:
  US 20170215222A1
• Time in Patent Office: 1,077 Days
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/0212 managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 72/121 for groups of terminals or users
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/52 based on load
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An example method is disclosed that is implemented by a base station that supports a plurality of UEs configured to use DRX. The base station transmits respective individual scheduling assignments to each UE in a group of the UEs during an initial, on Duration portion of a DRX cycle, thereby preventing the group of UEs from immediately entering a DRX mode after the onDuration of the DRX cycle. For each UE in the group, the scheduling assignments schedule a respective first data transmission during the onDuration, and also schedule a respective second data transmission after the onDuration but within the DRX cycle. The base station transmits the scheduled first data transmissions during the onDuration of the DRX cycle, and transmits the scheduled second data transmissions after the onDuration but within the DRX cycle. For each UE in the group, its second data transmission includes more data than its first data transmission.

Claims

1. A method, implemented by a base station that supports a plurality of user equipment (UEs) that are configured to use discontinuous reception (DRX), the method comprising:

transmitting respective individual scheduling assignments to each UE in a group of the UEs during an initial portion (onDuration) of a DRX cycle, thereby preventing the group of UEs from immediately entering a DRX mode after the onDuration of the DRX cycle, wherein for each UE in the group, the scheduling assignments schedule a respective first data transmission during the onDuration, and also schedule a respective second data transmission after the onDuration but within the DRX cycle;

transmitting the scheduled first data transmissions during the onDuration of the DRX cycle; and

transmitting the scheduled second data transmissions after the onDuration but within the DRX cycle;

wherein for each UE in the group, its second data transmission includes more data than its first data transmission.

2. The method of claim 1:

wherein the transmitting of the individual scheduling assignments and first and second data transmissions is performed if one or more conditions are met;

further comprising, if the one or more conditions are not met;

transmitting scheduling assignments to the group of UEs during the onDuration of the DRX cycle as physical layer group signaling, thereby preventing the group of UEs from immediately entering the DRX mode after the onDuration of the DRX cycle.

3. The method of claim 2, wherein the one or more conditions are based on one or more of:

a number of active UEs supported by the base station;

a number of UEs in the group; and

a load of the base station.

4. The method of claim 2, wherein the group signaling identifies the group of UEs through use of a common Radio Network Temporary Identifier (RNTI).

5. The method of claim 2, wherein the group signaling uses a bitmap to identify particular UEs in the group.

6. The method of claim 2, wherein the individual scheduling assignments and/or the group signaling of scheduling assignments are multiplexed in time and/or frequency.

7. The method of claim 2:

wherein the individual scheduling assignments and the group signaling of scheduling assignments are transmitted over a control channel on a first carrier; and

wherein the data transmissions scheduled by the individual scheduling assignments;

wherein the group signaling of scheduling assignments are transmitted over a second carrier that is different from the first carrier.

8. The method of claim 7, wherein one of the first and second carriers is part of licensed spectrum, and another of the first and second carriers is part of unlicensed spectrum.

9. The method of claim 8, wherein the first carrier is part of the licensed spectrum, and the second carrier is part of the unlicensed spectrum.

10. The method of claim 7:

wherein the first carrier is a Primary Cell (PCell); and

wherein the second carrier is a Secondary Cell (SCell).

11. A base station that is configured to support a plurality of user equipment (UEs) that are configured to use discontinuous reception (DRX), the base station comprising:

a transmission circuit;

processing circuitry configured to;

transmit, via the transmission circuit, respective individual scheduling assignments to each UE in a group of the UEs during an initial portion (onDuration) of a DRX cycle, thereby preventing the group of UEs from immediately entering a DRX mode after the onDuration of the DRX cycle, wherein for each UE in the group, the scheduling assignments schedule a respective first data transmission during the onDuration, and also schedule a respective second data transmission after the onDuration but within the DRX cycle;

transmit, via the transmission circuit, the scheduled first data transmissions during the onDuration of the DRX cycle; and

transmit, via the transmission circuit, the scheduled second data transmissions after the onDuration but within the DRX cycle;

wherein for each UE in the group, its second data transmission includes more data than its first data transmission.

12. The base station of claim 11, wherein the processing circuitry is configured to:

determine whether one or more conditions are met;

transmit, via the transmission circuit, the individual scheduling assignments and first and second data transmissions if the one or more conditions are met; and

transmit, via the transmission circuit and if the one or more conditions are not met, scheduling assignments to the group of UEs during the onDuration of the DRX cycle as physical layer group signaling, thereby preventing the group of UEs from immediately entering the DRX mode after the onDuration of the DRX cycle.

13. The base station of claim 12, wherein the one or more conditions are based on one or more of:

a number of active UEs supported by the base station;

a number of UEs in the group; and

a load of the base station.

14. The base station of claim 12, wherein the group signaling identifies the group of UEs through use of a common Radio Network Temporary Identifier (RNTI).

15. The base station of claim 12, wherein the group signaling uses a bitmap to identify particular UEs in the group.

16. The base station of claim 12, wherein the individual scheduling assignments and/or the group signaling of scheduling assignments are multiplexed in time and/or frequency.

17. The base station of claim 12, wherein the processing circuitry is configured to transmit, via the transmission circuit:

the individual scheduling assignments and the group signaling of scheduling assignments over a control channel on a first carrier; and

the data transmissions scheduled by the individual scheduling assignments and the group signaling of scheduling assignments over a second carrier that is different from the first carrier.

18. The base station of claim 17, wherein one of the first and second carriers is part of licensed spectrum, and another of the first and second carriers is part of unlicensed spectrum.

19. The base station of claim 18, wherein the first carrier is part of the licensed spectrum, and the second carrier is part of the unlicensed spectrum.

20. The base station of claim 17:

wherein the first carrier is a Primary Cell (PCell); and

wherein the second carrier is a Secondary Cell (SCell).