Enhanced paging schemes and connected-state DRX

Patent metadata

Field	Value
Publication number	US-10462765-B2
Application number	US-201916288996-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Jul 11, 2014
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

For paging user devices that are link budget limited (LBL), a base station transmits a special ID that is used by said devices to identify a paging frame and/or a paging occasion. When transmitting a paging message for an LBL device, the base station may use: (a) larger aggregation and larger CFI (than conventionally allowed) and (b) a larger number of resource blocks (than conventionally allowed) for paging payload. If paging messages for LBL devices saturate the paging frame capacity, the base station may allocate a plurality of special IDs. If paging messages for LBL devices and/or other data transfers saturate network capacity, at least a subset of the LBL devices may be directed to enter a connected-state discontinuous reception (DRX) mode, wherein those devices will remain in connected mode and periodically check for resource allocations. Paging payload information may be repeatedly transmitted in successive subframes, to support soft combining.

First claim

What is claimed is:

1. A user equipment (UE) device, comprising:
at least one radio, wherein the at least one radio is configured to perform orthogonal frequency-division multiplexing (OFDM) cellular communication using at least one radio access technology (RAT); and
a processing agent coupled to the at least one radio, and configured to:
determine that the UE device is a link budget limited UE device based on a measurement of received signal strength from a cell of a network;
inform the network that the UE device is link budget limited,
determine the cell supports an enhanced paging scheme for link budget limited UE devices from information received in a system information broadcast message;
determine a UE identifier from a subscriber identity of the UE device,
determine a range identifier, of a plurality of range identifiers, associated with a range of UE identifier values corresponding to the determined UE identifier, wherein the range of UE identifier values associated with the determined range identifier comprises a plurality of consecutive UE identifier values in accordance with the enhanced paging scheme, wherein a discontinuous reception (DRX) cycle and the range identifier are used by link budget limited devices to compute a paging frame identifier;

determine one or more radio frames to monitor for paging control messages consistent with the paging frame identifier and based on a modulo operation on the determined range identifier; and
monitor said one or more or radio frames for paging control messages.

2. The UE device of claim 1 , wherein to determine the UE identifier from the subscriber identity, the processing agent is further configured to perform a second modulo operation.

3. The UE device of claim 1 , wherein the subscriber identity is for an International Mobile Subscriber Identity (IMSI).

4. The UE device of claim 1 , wherein non-link-budget-limited UE devices use SFN mod T=(T div N)*(UE_ID mod N) to determine paging frame identifiers, wherein SFN is a System Frame Number.

5. The UE device of claim 1 , wherein the range identifier is determined based on the information received in the system information broadcast message.

6. The UE device of claim 1 , wherein an idle mode DRX cycle for the UE device is configured to be greater than 1.28 seconds.

7. The UE device of claim 1 , wherein a link budget limited status of the UE device is stored at a mobile management entity (MME) in the network.

8. A method for operating a user equipment (UE) device, the method comprising:
determining that the UE device is a link budget limited UE device based on a measurement of received signal strength from a cell of a network;
informing the network that the UE device is link budget limited,
determining the cell supports an enhanced paging scheme for link budget limited UE devices from information received in a system information broadcast message;
determining a UE identifier from a subscriber identity of the UE device,
determining a range identifier, of a plurality of range identifiers, associated with a range of UE identifier values corresponding to the determined UE identifier, wherein the range of UE identifier values associated with the determined range identifier comprise a plurality of consecutive UE identifier values in accordance with the enhanced paging scheme, wherein a discontinuous reception (DRX) cycle and the range identifier are used by link budget limited devices to compute a paging frame identifier;
determining one or more radio frames to monitor for paging control messages consistent with the paging frame identifier and based on a modulo operation on the determined range identifier; and
monitoring said one or more or radio frames for paging control messages.

9. The method of claim 8 , wherein to determine the UE identifier from the subscriber identity, the processing agent is further configured to perform a second modulo operation.

10. The method of claim 8 , wherein the subscriber identity is for an International Mobile Subscriber Identity (IMSI).

11. The method of claim 8 , wherein non-link-budget-limited UE devices use SFN mod T=(T div N)*(UE_ID mod N) to determine paging frame identifiers, wherein SFN is a System Frame Number.

12. The method of claim 8 , wherein the range identifier is determined based on the information received in the system information broadcast message.

13. The method of claim 8 , wherein an idle mode DRX cycle for the UE device is configured to be greater than 1.28 seconds.

14. The method of claim 8 , wherein a link budget limited status of the UE device is stored at a mobile management entity (MME) in the network.

15. A non-transitory computer accessible memory medium, comprising program instructions for a wireless user equipment (UE) device that, when executed by the UE device, cause the UE to:
determine that the UE device is a link budget limited UE device based on a measurement of received signal strength from a cell of a network;
inform the network that the UE device is link budget limited,
determine the cell supports an enhanced paging scheme for link budget limited UE devices from information received in a system information broadcast message,
determine a UE identifier from a subscriber identity of the UE device,
determine a range identifier, of a plurality of range identifiers, associated with a range of UE identifier values corresponding to the determined UE identifier, wherein the range of UE identifier values associated with the determined range identifier comprise a plurality of consecutive UE identifier values in accordance with the enhanced paging scheme, wherein a discontinuous reception (DRX) cycle and the range identifier are used by link budget limited devices to compute a paging frame identifier;
determine one or more radio frames to monitor for paging control messages consistent with the paging frame identifier and based on a modulo operation on the determined range identifier; and
monitor said one or more or radio frames for paging control messages.

16. The non-transitory computer accessible memory medium of claim 15 , wherein to determine the UE identifier from the subscriber identity, the processing agent is further configured to perform a second modulo operation.

17. The non-transitory computer accessible memory medium of claim 15 , wherein the subscriber identity is for an International Mobile Subscriber Identity (IMSI).

18. The non-transitory computer accessible memory medium of claim 15 , wherein non-link-budget-limited UE devices use SFN mod T=(T div N)*(UE_ID mod N) to determine paging frame identifiers, wherein SFN is a System Frame Number.

19. The non-transitory computer accessible memory medium of claim 15 , wherein the range identifier is determined based on the information received in the system information broadcast message.

20. The non-transitory computer accessible memory medium of claim 15 , wherein an idle mode DRX cycle for the UE device is configured to be greater than 1.28 seconds.

Assignees

• Apple Inc

Inventors

• Tabet Tarik
• Mujtaba Syed Aon
• Elsayed Moustafa M

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/51

  based on terminal or device properties · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W68/005 Primary

  Transmission of information for alerting of incoming communication · CPC title