Search

EP-3756393-B1 - PAGING FOR DELAY TOLERANT MOBILE TERMINALS AND APPLICATIONS

EP3756393B1EP 3756393 B1EP3756393 B1EP 3756393B1EP-3756393-B1

Inventors

  • IANEV, ISKREN
  • FAN, LINGHANG

Dates

Publication Date
20260513
Application Date
20190219

Claims (16)

  1. A user equipment, UE (3), comprising: means for transmitting, to a core network node (10) for mobility management, an indication for delayed paging capability; means for receiving, from the core network node (10), a paging message including an indication for delayed paging, wherein the indication indicates that the UE (3) is allowed to delay a response to the paging message; means for identifying whether or not the indication for delayed paging is included in the paging message, means for initiating a procedure for the delayed paging in a case where the indication for delayed paging is included in the paging message; means for checking whether a received signal level is greater than or equal to a threshold for determining to respond the paging signal; and means for transmitting a response to the paging signal in a case where the received signal level is greater than or equal to the threshold.
  2. The UE (3) according to claim 1, further comprising; means for responding to the paging message in a normal way, in a case where the received radio signal level is greater than or equal to the threshold.
  3. The UE (3) according to claim 1, further comprising: means for not responding to the paging message, in a case where the received radio signal level is below the threshold.
  4. The UE (3) according to the claim 1, further comprising: means for responding to the paging message, in a case where the received radio signal level becomes greater than or equal to the threshold.
  5. The UE (3) according to the claim 1, further comprising: means for not responding to the paging message, in a case where the received radio signal level stays below the threshold.
  6. A communication system comprising: a core network node (10) for mobility management; and a user equipment, UE (3), wherein the core network node (10) comprises: means for receiving, from the UE (3), an indication for delayed paging capability; means for transmitting, to the UE (3), a paging message including an indication for delayed paging, wherein the indication indicates that the UE (3) is allowed to delay a response to the paging message; and means for receiving a response to the paging message in a normal way, in a case where a radio signal level which is received by the UE (3) is greater than or equal to the threshold.
  7. The system according to claim 6, wherein the indication for the delayed paging is included in the paging message in a case where the core network node (10) receives downlink data with an indication for delayed paging from a service provider and/or the core network node (10) receives an indication for delayed paging capability from the UE (3).
  8. The system according to claim 7, wherein the core network node (10) further comprises means for receiving the indication for delayed paging with a downlink data request message.
  9. The system according to claim 7, wherein the core network node (10) futher comprises means for receiving the indication for delayed paging capability in a registration request message.
  10. The system according to claim 6, wherein the indication for delayed paging is included in the paging message in a case where UE subscription information in a Unified Data Management, UDM, reveals the UE (3) or a service is delay tolerant.
  11. The system according to claim 6, wherein the core network node (10) further comprises means for starting a delayed paging timer in a case where the core network node (10) includes the indication for delayed paging in the paging message.
  12. The sytem according to claim 11, wherein the core network node (10) further comprises means for transmitting a repeated paging message to the UE (3) and for restarting the delay paging timer for predetermined times, in a case where the core network node (10) does not receive an answer for a delayed paging request, from the UE (3) before expiry of the delayed paging timer.
  13. The system according to claim 11 or 12, wherein in a case where the core network node (10) receives an answer from the UE (3) to a delayed paging request or to the repeated paging message before the expiry of the delayed paging timer, the delayed paging is successful.
  14. The system according to claim 12, wherein in a case where the core network node (10) does not receive answer to the repeated paging message before the expiry of the delayed paging timer, the delayed paging fails.
  15. A method performed by a user equipment, UE (3), the method comprising: transmitting, to a core network node (10) for mobility management, an indication for delayed paging capability; receiving, from the core network node (10), a paging message including an indication for delayed paging, wherein the indication indicates that the UE (3) is allowed to delay a response to the paging message; identifying whether or not the indication for delayed paging is included in the paging message; initiating a procedure for the delayed paging in a case where the indication for delayed paging is included in the paging message; checking whether a received signal level is greater than or equal to a threshold for determining to respond the paging signal; and transmitting a response to the paging signal in a case where the received signal level is greater than or equal to the threshold.
  16. A method performed by a communication system comprising a core network node (10) for mobility management and a user equipment, UE (3), the method comprising: receiving, by the core network node (10), from the UE (3), an indication for delayed paging capability; transmitting, by the core network node (10), to the UE (3), a paging message including an indication for delayed paging , wherein the indication indicates that the UE (3) is allowed to delay a response to the paging message; and receiving, by the core network node (10), a response to the paging message in a normal way, in a case where a radio signal level which is received by the UE (3) is greater than or equal to the threshold.

Description

The present invention relates to a communication system. The invention has particular but not exclusive relevance to wireless communication systems and devices thereof operating according to the 3rd Generation Partnership Project (3GPP) standards or equivalents or derivatives thereof. The invention has particular although not exclusive relevance to paging in the so-called '5G' (or 'Next Generation') systems. 3GPP SA2 Working Group has started a study on 5G CloT in 3GPP Technical Report (TR) 23.724 for Rel-16 with several objectives: Enable CloT/MTC functionalities in 5G CN. The objective is to study how to support identified CloT/MTC functionalities in 5G CN with potential connectivity to Wideband (WB)-EUTRA (eMTC) and/or NB-loT for 5GS capable devices.Co-existence and migration from EPC based eMTC/NB-IoT to 5GCN. The objective is to study solutions for coexistence and migration from EPC towards 5G CN for eMTC/NB-loT. It will study solutions where the same service is offered to some UEs connected to EPC and some UEs connected to 5G CN e.g. using SCEF and equivalent functionalities in 5G CN. Solutions that assume that 5G CN needs to support EPC NAS signalling for legacy loT devices access are not considered.5G System enhancements to address 5G service requirements (based on 3GPP Technical Specification (TS) 22.261 V16.2.0 and TR 38.913 V14.3.0). To study system architecture enhancements to address related service requirements defined in TS 22.261 V16.2.0 and RAN requirements defined in TR 38.913 V14.3.0 and how to enable them in 5G CN, if needed. At least the following service requirements have been identified: Enable the change of association between subscription and address/number of an loT device within same operator and in between different operators. 3GPP SA2 has already identified multiple Key Issues in order to fulfil the objectives set in the 5G CloT Study. One of the main areas identified for improvement in the 5G CloT study is the further improvements in the UE power saving. For example Key Issue 5 of the TR 23.724 V0.1.0 is about UE Transmission (TX) Power Saving Functions. It is observed that when UE communicates with the network, the TX power consumption of each data transmission is more than ten times of the RX power consumption and the TX power consumption contributes much to the UE whole power consumption. So, optimizing the TX power consumption is an effective way to improve UE power saving. This key issue aims to optimize UE TX power consumption under certain conditions, e.g. in weak coverage, with high latency application, or any other conditions under which UE TX power consumption can be improved. It is observed that when UE communicates with a network, the TX power consumption of each data transmission is more than ten times of the RX power consumption and the TX power consumption contributes much to the UE whole power consumption. So, one of the open issues of the 5G CloT Study in TR23.724 V0.1.0 is to identify the conditions under which UE transmission power consumption can be improved, i.e. reduced. This invention aims at saving the UE power consumption for data exchange with the network. US 2012/0202543 A1 discloses a method and apparatus for paging downlink (DL) data to one or more Machine-to-Machine (M2M) devices. The paging may be performed with network re-entry or with a delayed network re-entry. 3GPP Draft S2-101170 is concerned with MTC device low power consumption and device triggering. 3GPP Draft R2-1801803 includes a discussion on paging overload reduction due to beam sweeping. EP 3 562 178 A1 discloses a paging method: a terminal device receives a paging message transmitted by an access network device, wherein the paging message includes indication information, and the indication information is used to indicate that delay in return of a paging response message is allowed; and the terminal device decides whether to delay returning the paging response message according to a current link status. EP 3 841 807 A1 discloses a method of managing a paging message for a UE in a wireless communication network includes transmitting the paging message to the UE in the wireless communication network, receiving a wait indication from the UE, and delaying a retransmission of the paging message to the UE responsive to receiving a wait indication from the UE. US 2016/128078 A1 discloses a method comprising: receiving a downlink (DL) data packet intended for a UE, buffering the received DL data packet in response to a determination that the received DL data packet is low priority, starting a timer, the timer being set in response in response to the UE currently being in an idle state, and transmitting the DL data packet to the UE upon the expiration of the timer. Both EP3562178 A1 and EP3841807 A1 are prior art documents according to Article 54(3) EPC. The present invention is defined by the independent claims. Optional features are defined in the appended dependent claims. The invention wil