Optimized mechanism for paging transmission and reception

Patent metadata

Field	Value
Publication number	US-9622215-B2
Application number	US-201514918773-A
Country	US
Kind code	B2
Filing date	Oct 21, 2015
Priority date	May 9, 2014
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Methods and apparatus are provided for paging transmission and reception for UEs requiring coverage extension/coverage enhancement. In one novel aspect, the UE reports the CE status to the MME. CE level related information and the corresponding cell ID are provided from eNB to MME. MME sends paging information including the repetition number to all eNBs in the corresponding tracking area when paging the UE. In another novel aspect, a paging area is used for CE UEs. The UE receives paging area information, notifies the network, and updates the stored paging area information upon detecting changes between the received and the stored paging areas. In another embodiment, the UE reports its CE status upon detecting CE status changes. The eNB stores UE CE information and forwards it to neighboring eNBs in the same paging area. The eNB pages UEs on its CE UE list with repetition while paging other UEs normally.

First claim

What is claimed is:

1. A method comprising:
receiving information of a paging area by a user equipment (UE) requiring a coverage extension/coverage enhancement (CE) from a base station in a wireless network, wherein the paging area is a subset of a tracking area covered by a subset of one or more base stations or cells which are closest to the UE;
determining if there is one or more changes between the received paging area and a stored paging area of the UE;
notifying the base station if there is one or more paging area changes; and
receiving paging messages in the paging area, wherein each paging messages for the UE is transmitted repeatedly by a repetition number greater than one.

2. The method of claim 1 , wherein the notifying the base station involves:
establishing a radio resource control (RRC) connection with the base station; and
reporting a CE status of the UE to the base station.

3. The method of claim 2 , wherein an establishment cause IE of a RRC Connection Request for the RRC connection establishment indicating a paging area change.

4. The method of claim 2 further comprising:
reporting the stored paging area information to the base station.

5. The method of claim 1 further comprising:
updating the stored paging area if there is paging area change.

6. The method of claim 1 further comprising:
reporting the stored paging area information to the wireless network periodically.

7. The method of claim 1 further comprising:
detecting a CE status change; and
reporting the CE status change to the wireless network.

8. A method comprising:
storing information of a paging area by a base station, wherein the paging area is a geographic area covered by a cluster of neighboring base station, and wherein the paging area is a subset of a tracking area covered by a subset of one or more base stations or cells which are closest to one or more corresponding UEs;
storing a coverage extension/coverage enhancement (CE) user equipment (UE) list comprising UEs requiring CE, wherein repetition transmission for each transmission is used for UEs requiring CE;
updating the CE UE list upon detecting triggering event; and
paging the UEs on the CE UE list repeatedly by a repetition number greater than one.

9. The method of claim 8 , wherein the paging area is derived by coordinating among neighboring base stations identified by a base station ID or a neighboring cell list.

10. The method of claim 8 further comprising: broadcasting the information of the paging area in a system information message.

11. The method claim 8 wherein the triggering event is receiving a notification of presence by a UE requiring CE.

12. The method of claim 11 wherein the notification of presence includes a CE status of the UE.

13. The method of claim 11 further comprising: establishing a radio resource control (RRC) connection with the UE, and wherein an establishment cause IE in a RRC Connection Request message for the RRC establishment indicates a paging area change.

14. The method of claim 11 further comprising: forwarding the UE notification of presence information to the base stations in the paging area.

15. The method of claim 8 , wherein the triggering event is receiving a notification of CE UE presence from a neighboring base station.

16. The method of claim 8 further comprising: deleting one or more UEs from the CE UE list upon detecting one or more releasing events.

17. The method of claim 16 wherein the release events comprising: failure to receive a paging response from the UE after repeatedly tries by the repetition number, failure to receive a paging response after a period of time, or receiving a notification from a neighboring base station indicating the UE is out of the paging area.

18. A user equipment (UE) comprising
a transceiver that transmits and receives radio signals via a first radio access link;
an information storage circuit that stores information of a stored paging area;
a paging area tracker circuit that receives information of a paging area from a base station when the UE requires coverage extension/coverage enhancement (CE), wherein the paging area is covered by a subset of one or more base stations or cells which are closest to the UE, determines if there is one or more changes between the paging area and the stored paging area of the UE, and notifies the base station if there is one or more paging area changes; and
a pager circuit that receives and processes paging messages in the paging area, wherein the page messages are transmitted repeatedly by a repetition number greater than one.

19. The UE of claim 18 , wherein the paging area tracker circuit establishes a radio resource control (RRC) connection with the base station and reports a CE status of the UE to the base station.

20. The UE claim 19 , wherein an establishment cause IE of a RRC Connection Request for the RRC connection establishment indicates a paging area change.

21. The UE of claim 19 , wherein the paging area tracker circuit further reports the stored paging area information to the wireless network.

22. The UE of claim 18 , wherein the information storage circuit updates the stored paging area if there is paging area change.

23. The UE of claim 18 , wherein the paging area tracker circuit reports the stored paging area information to the wireless network periodically.

24. The UE of claim 18 , wherein the paging area tracker circuit reports CE status to the wireless network upon detecting a CE status change.

Assignees

• Mediatek Singapore Pte Ltd

Inventors

• Zhang Yuanyuan
• Jheng Yu-Syuan
• Sun Feifei
• Chen Li
• Fu I-Kang

Classifications

• H04W68/02 Primary

  Arrangements for increasing efficiency of notification or paging channel · CPC title

• H04W76/10

  Connection setup · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04W68/005

  Transmission of information for alerting of incoming communication · CPC title

• H04W4/021

  Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences · CPC title