Devices and methods for communication
The implementation of robust notification systems to guide UE to better channel conditions addresses inefficiencies in paging mechanisms, enhancing reliability and reducing power consumption, thus improving communication performance.
Patent Information
- Application Number
- PCT/CN2024/073821
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-24
- Publication Date
- 2025-07-31
AI Technical Summary
Existing communication systems face inefficiencies in paging mechanisms due to poor channel conditions, leading to latency, resource wastage, and poor user experience, particularly for non-line-of-sight (NLOS) user equipment (UEs) in non-terrestrial networks, resulting in missed calls and messages.
Implementing robust notification information to guide user equipment (UE) to move to locations with better channel conditions, involving the transmission of UE identity, movement indication, and location information, along with methods to switch between legacy and robust notification messages, and timing mechanisms to optimize power consumption and connection setup.
Enhances the reliability of paging by reducing power consumption and access failures, ensuring seamless communication setup even in challenging channel conditions, thereby improving user experience and resource utilization.
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Figure CN2024073821_31072025_PF_FP_ABST
Abstract
Description
DEVICES AND METHODS FOR COMMUNICATION
[0001] FIELDS
[0002] Example embodiments of the present disclosure generally relate to the field of communication techniques and in particular, to devices and methods for robust notification.BACKGROUND
[0003] In communications, it is often the case that a channel condition is so poor that a normal paging message cannot be received, and therefore the probability for a UE receiving a mobile terminated call needs to be maximized. In order to address operational inefficiencies and enhance overall performance, there is a pressing need to improve the existing paging mechanism. Current challenges include issues related to latency, resource utilization, and user experience. Thus, exploring and implementing solutions to optimize the paging mechanism is crucial for achieving a more efficient and seamless system. In conclusion, the paging mechanism needs to be enhanced.SUMMARY
[0004] In general, embodiments of the present disclosure provide for communication.
[0005] In a first aspect, a terminal device is provided. The terminal device comprises: a processor, which is configured to cause the terminal device to receive robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates from a network device, and initiate a connection set up or resume procedure after a time duration from the reception of the robust notification information.
[0006] In a second aspect, a terminal device is provided. The terminal device comprises a processor which is configured to cause the terminal device to: in response to that the terminal device is able to monitor a first type of paging message and a second type of message, determine whether a condition for monitoring the second type of message is satisfied, wherein the second type of message comprises robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and monitor the first type of paging message or a second type of message from a network device based on the determination.
[0007] In a third aspect, a core network device is provided. The core network device comprises a processor which is configured to cause the core network device to transmit a paging message to a network device; and transmit robust notification information to the network device. The robust notification information is used to inform the terminal device to move to a location with a better channel condition than a current location where a terminal device locates.
[0008] In a fourth aspect, a network device is provided. The network device comprises a processor which is configured to cause the network device to transmit robust notification information to a further network device. The robust notification information is used to inform a terminal device to move to a location with a better channel condition than a current location where a terminal device locates, wherein the robust notification information comprises at least one of: user equipment (UE) identity information, an indication of the movement, or location information associated with the target location.
[0009] In a fifth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and initiating a connection set up or resume procedure, after a time duration from the reception of the robust notification information.
[0010] In a sixth aspect, there is provided a communication method performed by a terminal device. The method comprises: in response to that the terminal device is able to monitor a first type of paging message and a second type of message, determining whether a condition for monitoring the second type of message is satisfied, wherein the second type of message comprises robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and monitoring the first type of paging message or the second type of message from a network device based on the determination.
[0011] In a seventh aspect, there is provided a communication method performed by a core network device. The method comprises: transmitting, to a network device, a paging message; and transmitting, to the network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where a terminal device locates.
[0012] In an eighth aspect, there is provided a communication method performed by a network device. The method comprises: transmitting, to a further network device, robust notification information that is used to inform a terminal device to move to a location with a better channel condition than a current location where a terminal device locates, wherein the robust notification information comprises at least one of: user equipment (UE) identity information, an indication of the movement, or location information asso ciated with the target location.
[0013] In a ninth aspect, there is provided a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to the fifth, sixth, seventh, or eighth aspect.
[0014] Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Through the more detailed description of some example embodiments of the present disclosure in the accompanying drawings, the above and other objects, features and advantages of the present disclosure will become more apparent, wherein:
[0016] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented;
[0017] FIG. 2 illustrates a signaling flow of transmitting robust notification information in accordance with some embodiments of the present disclosure;
[0018] FIG. 3 illustrates a schematic diagram of delaying a transmission of the robust notification information in accordance with some embodiments of the present disclosure;
[0019] FIG. 4 illustrates a signaling flow of monitoring paging messages in accordance with some embodiments of the present disclosure;
[0020] FIG. 5 illustrates a schematic diagram of a paging occasion (PO) including physical downlink control channel (PDCCH) monitoring occasions for different types of messages;
[0021] FIG. 6A and FIG. 6B illustrate schematic diagrams of performing a switching between two types of messages based on a counter in accordance with some embodiments of the present disclosure, respectively;
[0022] FIG. 7 illustrates a signaling flow of transmitting robust notification information in accordance with some other embodiments of the present disclosure;
[0023] FIG. 8A and FIG. 8B illustrate schematic diagrams of a transmission of the robust notification information based on a timer in accordance with some embodiments of the present disclosure, respectively;
[0024] FIG. 9 illustrates a signaling flow of transmitting robust notification information in accordance with some other embodiments of the present disclosure;
[0025] FIG. 10 illustrates a flowchart of a method implemented at a terminal device, according to some example embodiments of the present disclosure;
[0026] FIG. 11 illustrates a flowchart of a method implemented at a terminal device, according to some example embodiments of the present disclosure;
[0027] FIG. 12 illustrates a flowchart of a method implemented at a core network device, according to some example embodiments of the present disclosure;
[0028] FIG. 13 illustrates a flowchart of a method implemented at a network device, according to some example embodiments of the present disclosure; and
[0029] FIG. 14 illustrates a simplified block diagram of an apparatus that is suitable for implementing example embodiments of the present disclosure.
[0030] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0031] Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein can be implemented in various manners other than the ones described below.
[0032] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0033] As used herein, the term ‘terminal device’ refers to any device having wireless or wired communication capabilities. Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Ultra-reliable and Low Latency Communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, devices on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure / network, devices for Integrated Access and Backhaul (IAB) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including Satellites and High Altitude Platforms (HAPs) encompassing Unmanned Aircraft Systems (UAS) , eXtended Reality (XR) devices including different types of realities such as Augmented Reality (AR) , Mixed Reality (MR) and Virtual Reality (VR) , the unmanned aerial vehicle (UAV) commonly known as a drone which is an aircraft without any human pilot, devices on high speed train (HST) , or image capture devices such as digital cameras, sensors, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like. The ‘terminal device’ can further has ‘multicast / broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4 / IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporate one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM. The term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
[0034] The term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate. Examples of a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , and the like.
[0035] The terminal device or the network device may have Artificial intelligence (AI) or Machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
[0036] The terminal or the network device may work on several frequency ranges, e.g., FR1 (e.g., 450 MHz to 6000 MHz) , FR2 (e.g., 24.25GHz to 52.6GHz) , frequency band larger than 100 GHz as well as Tera Hertz (THz) . It can further work on licensed / unlicensed / shared spectrum. The terminal device may have more than one connection with the network devices under Multi-Radio Dual Connectivity (MR-DC) application scenario. The terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
[0037] The embodiments of the present disclosure may be performed in test equipment, e.g., signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator. In some embodiments, the terminal device may be connected with a first network device and a second network device. One of the first network device and the second network device may be a master node and the other one may be a secondary node. The first network device and the second network device may use different radio access technologies (RATs) . In some embodiments, the first network device may be a first RAT device and the second network device may be a second RAT device. In some embodiments, the first RAT device is eNB and the second RAT device is gNB. Information related with different RATs may be transmitted to the terminal device from at least one of the first network device or the second network device. In some embodiments, first information may be transmitted to the terminal device from the first network device and second information may be transmitted to the terminal device from the second network device directly or via the first network device. In some embodiments, information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device. Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
[0038] As used herein, the singular forms ‘a’ , ‘an’ and ‘the’ are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term ‘includes’ and its variants are to be read as open terms that mean ‘includes, but is not limited to. ’ The term ‘based on’ is to be read as ‘at least in part based on. ’ The term ‘one embodiment’ and ‘an embodiment’ are to be read as ‘at least one embodiment. ’ The term ‘another embodiment’ is to be read as ‘at least one other embodiment. ’ The terms ‘first, ’ ‘second, ’ and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below.
[0039] In some examples, values, procedures, or apparatus are referred to as ‘best, ’ ‘lowest, ’ ‘highest, ’ ‘minimum, ’ ‘maximum, ’ or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
[0040] As used herein, the term “resource, ” “transmission resource, ” “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
[0041] As used herein, the term "paging" may refer to a broadcast communication technique used in wireless communication networks to call or locate specific user devices. Through paging, the network can send a paging message to particular users or user groups, activating their devices and bringing them into communication mode. This technology is commonly employed in mobile communication systems, such as cellular networks, to locate and awaken mobile devices that are in an idle state. Overall, paging is a communication technique used in wireless networks to deliver paging messages to specific users. It is noted that example embodiments of the present disclosure are equally applicable to other paging in other domains.
[0042] As used herein, the term "threshold" may refer to a predefined limit or point of transition that, when crossed or reached, triggers a particular action, response, or change. It serves as a boundary or critical point indicating a shift in a process or state. Threshold is applied in different fields, including statistics, neuroscience, technology, and decision-making. Overall, threshold is a crucial point or level that serves as a trigger for specific actions or outcomes. It is noted that example embodiments of the present disclosure are equally applicable to other threshold in other domains.
[0043] As used herein, the term "time duration" may refer to the length of time that elapses between two specific points or events. It is the measure of the time taken for a particular activity, process, or interval to occur. Time duration is fundamental in scheduling, planning, and analyzing various aspects of systems and events. It is noted that example embodiments of the present disclosure are equally applicable to other time duration in other domains.
[0044] As used herein, the term "condition" may refer to the current state or specific circumstances that characterize a communication system, device, or environment. It encompasses aspects such as signal quality, connection status, and network congestion. It is noted that example embodiments of the present disclosure are equally applicable to other condition in other domains.
[0045] As used herein, the term "channel quality" may refer to the overall condition and reliability of a communication channel. The term is primarily used to assess how well the channel can convey information from a sender to a receiver while considering various factors that may affect signal integrity. Channel quality is crucial in determining the effectiveness and reliability of data transmission. Key aspects influencing channel quality include signal strength, signal-to-noise ratio, and the presence of interference or distortion. It is noted that example embodiments of the present disclosure are equally applicable to other channel quality in other domains.
[0046] As used herein, the term "timer" may refer to a device or program component designed to measure time intervals and trigger specific events or control operations when certain time conditions are met. Timers play a crucial role in communication protocols, network communication, and various communication systems. It is noted that example embodiments of the present disclosure are equally applicable to other timer in other domains.
[0047] As used herein, the term "counter" may refer to a numerical variable or register used to keep track of specific events or occurrences within a system. Counters are commonly employed to monitor and record various activities, providing a means to quantify and manage specific aspects of a communication system. Counters play a crucial role in protocols, network management, and performance analysis. It is noted that example embodiments of the present disclosure are equally applicable to other counter in other domains.
[0048] The term "core network" refers to the central part of a communication network that is responsible for routing, switching, and managing data traffic. It is the backbone of the network that connects various access networks and facilitates the exchange of information between users or devices. The core network plays a crucial role in ensuring the seamless flow of data across the entire communication infrastructure.
[0049] As mentioned above, paging needs to be enhanced. For example, according to some solutions, DL coverage enhancements work primarily targets line of sight (LOS) UEs experiencing poor DL coverage due to effective isotropic radiated power (EIRP) density reduction. However, other issues (for example, shadow fading and clutter loss for suburban and rural scenarios) affecting non-LOS (NLOS) UEs results in coverage drops of 18dB. The data shows that at 30 degrees elevation, about 10%of users in rural and 50%in urban scenarios will experience NLOS. This reduction severely impacts the ability for such UEs to receive DL signaling such as paging. In this case, users may experience poor reception conditions and thus miss calls and messages for incoming service via non terrestrial network (NTN) only, which can be especially detrimental for public safety or emergency purpose paging messages.
[0050] In another solution, to address the problem of missed paging messages to a UE in low SNR conditions (e.g. NLOS) , the definition of a UE specific notification / alert feature is proposed. The notification may be to invite the user to move to a better SNR condition in order to set-up the call. The feature may be able to mitigate to the maximum extent the additional loss compared to the link margin required in Line of Sight conditions. However, this solution has optimization challenges, including ensuring synchronization of the UE with the network under low SNR or NLOS conditions. Designing a dedicated notification / alert message for reception by the UE in low SNR or NLOS conditions after normal paging failure is another challenge. Additionally, understanding how this feature will impact the nominal paging / call set-up procedure at network and UE level needs further consideration.
[0051] In addition, there may be also other unresolved issues. For example, in the configuration of both legacy paging message and message with robust notifications for NTN to optimize User Equipment (UE) power usage, the challenge lies in effectively switching between two types of message. Additionally, once receiving a robust notification message, the critical consideration is the time required for the message to become effective. Furthermore, there is a need to trigger robust notifications. Lastly, some Xn / F1 messages need to be considered. These issues require in-depth examination and potential solutions within the disclosed technology to ensure optimal functionality and performance.
[0052] In order to solve at least part of the problems, solutions on paging enhancement are proposed. Firstly, a method for switching between legacy paging message and robust notification message, which can reduce the power consumption. Secondly, a method for taking effect time for robust notification message. This invention may avoid access failure. Additionally, a method for triggering condition for robust notification message. Lastly, Xn / F1 interface information is included in this case.
[0053] Principles and implementations of the present disclosure will be described in detail below with reference to the figures.
[0054] FIG. 1 illustrates a schematic diagram of an example communication environment 100 in which example embodiments of the present disclosure can be implemented. In the communication environment 100, a plurality of communication devices, including a terminal device 110, a network device 120, and a core network device 130 can communicate with each other.
[0055] In the example of FIG. 1, the terminal device 110 may be a UE and the network device 120 may be a base station serving the UE. The core network device 130 may be routers, switches, or other network elements that play a crucial role in directing data packets, establishing connections, and managing the flow of information across the network. For example, the core network device 130 may be implemented at an access management function (AMF) entity. The serving area of the network device 120 may be called a cell 102.
[0056] It is to be understood that the number of devices and their connections shown in FIG. 1 are only for the purpose of illustration without suggesting any limitation. The communication environment 100 may include any suitable number of devices configured to implementing example embodiments of the present disclosure. Although not shown, it would be appreciated that one or more additional devices may be located in the cell 102, and one or more additional cells may be deployed in the communication environment 100. It is noted that although illustrated as a network device, the network device 120 may be another device than a network device. Although illustrated as a terminal device, the terminal device 110 may be other device than a terminal device. It is noted that although illustrated as a core network device, the core network device 130 may be other device than a core network device.
[0057] In the following, for the purpose of illustration, some example embodiments are described with the terminal device 110 operating as a UE and the network device 120 operating as a base station, similarly, the core network device 130 operating as a router. However, in some example embodiments, operations described in connection with a terminal device may be implemented at a network device or other device, and operations described in connection with a network device may be implemented at a terminal device or other device.
[0058] In some example embodiments, if the terminal device 110 is a terminal device and the network device 120 is a network device, a link from the network device 120 to the terminal device 110 is referred to as a downlink (DL) , while a link from the terminal device 110 to the network device 120 is referred to as an uplink (UL) . In DL, the network device 120 is a transmitting (TX) device (or a transmitter) and the terminal device 110 is a receiving (RX) device (or a receiver) . In UL, the terminal device 110 is a TX device (or a transmitter) and the network device 120 is a RX device (or a receiver) .
[0059] The communications in the communication environment 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , New Radio (NR) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , Machine Type Communication (MTC) and the like. The embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or the sixth generation (6G) networks.
[0060] Reference is made to FIG. 2, which illustrates a signaling flow 200 of transmitting robust notification information in accordance with some embodiments of the present disclosure. For the purposes of discussion, the signaling flow 200 will be discussed with reference to FIG. 1, for example, by using the terminal device 110 and the network device 120.
[0061] The network device 120 transmits (2010) robust notification information to the terminal device 110. In other words, the terminal device 110 receives (2010) the robust notification information from the network device 120. The robust notification information is used to inform the terminal device 110 to move to a target location with a better channel condition than a current location where the terminal device 110 locates.
[0062] In some embodiments, the robust notification information may include UE identity information. For example, the UE identity information may include a UE identity associated with the terminal device 110. Alternatively, the UE identity information may include a set of UE identities which contains the UE identity of the terminal device 110. In some embodiments, the set of UE identities may include up to 32 UE identities. In some other embodiments, the UE identity information may include one or more most significant bits (MSBs) of the set of UE identities. In this case, by way of example, if the UE ID is “010110” , the UE identity information may be “010” . Alternatively, the UE identity information may include one or more least significant bits (LSBs) of the set of UE identities. As an example, if the UE ID is “010110” , the UE identity information may be “110” . In some other embodiments, the UE identity information may include a radio network temporary identifier associated with the terminal device. For example, the UE identity information may include a third part of an inactive radio network temporary identifier (I-RNTI) . The third part of the I-RNTI may include UE related information that is associated with the terminal device 110. As an example, the UE identity information may include 5G Temporary Mobile Subscriber Identity (5G-TMSI) for next generation (NG) -5G-S-TMSI. In this way, the content of the message sent from the network device 120 to the terminal device 120 may be changed from robust notification to configuration dedicated for a paging message, which compresses the information to be transmitted and reduces the number of transmitted bits, and thereby increasing the probability of receiving notification / alert message. probability of receiving notification / alert message.
[0063] In some embodiments, the robust notification information may include an indication of the movement. For example, the robust notification information may include a notification or indication on moving to a better coverage area.
[0064] Alternatively, or in addition, the robust notification information may include location information associated with the target location. For example, the robust notification information may include location or vector information related to the target location. In some embodiments, the location information may include a cell identity (such as, cell global identity (CGI) ) associated with the target location. Alternatively, or in addition, the robust notification information may include a reference location to which the terminal device 110 can move. The reference location may be from system information block (SIB) 19. In some other embodiments, the location information may include a distance between the target location and the current location. In some further embodiments, the location information may include a reference angle associated with the target location. All above information may be informed based on the current environment, such as boats, pockets.
[0065] In some embodiments, the robust notification information may be transmitted in a paging message. In this case, in some embodiments, the paging message for the robust notification information may be a reused paging message. In other words, the current paging message may be reused for the robust notification information. If the current paging message is reused, the number of UE identities may be limited to a number, such as 32. Alternatively, the paging message for the robust notification information may be a dedicated paging message. For example, a new paging message may be defined for the robust notification information.
[0066] In some other embodiments, the robust notification information may be transmitted in downlink control information (DCI) . In this case, in an example embodiment, the DCI may be in a reused format. For example, the DCI may be DCI 1_0. In this way, since the DCI 1_0 format includes a small number of bits, the probability of decoding the DCI is high. It is noted that other existing DCI formats may also be used. In another example, the DCI may be in a dedicated format. In other words, a new DCI format may be defined for the robust notification information.
[0067] In some further embodiments, the robust notification information may be transmitted in system information. In this case, in some embodiments, the robust notification information may be transmitted in a reused system information block (SIB) . Alternatively, the robust notification information may be transmitted in a dedicated SIB.
[0068] The terminal device 110 initiates (2020) a connection set up or resume procedure, after a time duration. For example, as shown in FIG. 3, the terminal device 110 may receive the robust notification information at a time instant 310. The connection set up or resume procedure may be initiated at a time instant 320, after the time duration 330 from the time instant 310.
[0069] In some embodiments, if the terminal device 110 is in an RRC idle state, the terminal device 110 may initiate the connection set up procedure. In this case, the terminal device 110 may transmit an RRC connection set up request to the network device 120. Alternatively, if the terminal device is in an RRC inactive state, the terminal device 110 may initiate the connection resume procedure. In this case, the terminal device 110 may transmit an RRC connection resume request to the network device 120.
[0070] In some embodiments, the time duration may be configured by the network device 120. For example, the network device 120 may transmit (2005) a configuration indicating the time duration to the terminal device 110. In other words, the terminal device 110 may receive the configuration indicating the time duration from the network device 120. In some embodiments, the configuration may be transmitted in a SIB. Alternatively, the configuration may be transmitted in an RRC message.
[0071] In some embodiments, the time duration may be a constant value. For example, the time duration may be 60 ms. It is noted that the time duration may be any suitable value. Table 1 below shows an example procedure of delaying the transmission of the robust notification information. It is noted that table 1 is only an example not limitation.
[0072] Table 1
[0073] Alternatively, the terminal device 110 may determine (2015) the time duration. For example, if the robust notification information includes the location information associated with the target location, the terminal device 110 may determine to initiate the connection set up or resume procedure based on the location information. The terminal device 110 may determine a distance between the current location and the location based on the location information. In this case, the terminal device 110 may determine (2015) the time duration based on the distance between the current location and the location. By way of example, if the target location is far from the current location, a longer time duration may be used.
[0074] According to example embodiments described with reference to FIG. 2, the terminal device 110 may delay a time to perform RRC connection set up / resume procedure, after receiving the robust notification information. In this way, it can avoid access failure.
[0075] Reference is made to FIG. 4, which illustrates a signaling flow 400 of monitoring paging messages in accordance with some embodiments of the present disclosure. For the purposes of discussion, the signaling flow 400 will be discussed with reference to FIG. 1, for example, by using the terminal device 110 and the network device 120.
[0076] In some embodiments, if robust notification information which is used to inform the terminal device 110 to move to a target location with a better channel condition than a current location where the terminal device 110 locates is transmitted in a paging message, there may be two different types of messages, i.e., a first type of paging message including a conventional paging message and a second type of message including the robust notification information. Example contents included in the robust notification information described with reference to FIG. 2 can also be implemented embodiments described with reference to FIG. 4, which are omitted here.
[0077] The terminal device 110 may be able to monitor two types of message. In some embodiments, the two types of message may share a same paging occasion (PO) but have different physical downlink control channel (PDCCH) monitoring occasions. For example, as shown in FIG. 5, the terminal device 110 may be configured with a paging occasion (PO) 500. The PDCCH monitoring occasions 510-1, 510-2 and 510-3 may be used to monitor the first type of paging message and the PDCCH monitoring occasions 520-1, 520-2 and 520-3 may be used to monitor the second type of message. It is noted that the number of POs and the number PDCCH monitoring occasions shown in FIG. 5 are only examples not limitations. In some other embodiments, the terminal device 110 may be configured with difference search spaces for monitoring the two types of message.
[0078] In order to save power, only one type of message can be monitored. In particular, the terminal device 110 determines (4010) whether a condition for monitoring the second type of message is satisfied. Further, based on the determination, the terminal device 110 monitors (4015) the first or second type of message, which is from the network device (120) . In this way, power consumption at the terminal device 110 can be reduced. Example embodiments of the determination (4010) and the monitoring (4015) are described below.
[0079] In some embodiments, the terminal device 110 determines whether the condition is satisfied based on a measured channel condition, for example, the measured channel condition may include one or more of: reference signal received power (RSRP) , reference signal received quality (RSRQ) , signal to interference plus noise ratio (SINR) , and received signal strength indication (RSSI) . The terminal device 110 may obtain the measured channel condition by performing a measurement on a reference signal from the network device 120, for example, a downlink pathloss reference.
[0080] If the measured channel quality is less than a threshold, the condition may be determined to be satisfied. In other words, if the measured channel quality is less than the threshold, the terminal device 110 may monitor the second type of message. For example, if the RSRP is less than the threshold, the terminal device 110 may receive the second type of message including the robust notification information. Alternatively, if the measured channel quality is not less than a threshold, the terminal device 110 may determine that the condition is unsatisfied. That is, if the measured channel quality is not less than the threshold, the terminal device 110 may monitor the first type of paging message. For example, if the RSRP is not less than the threshold, the terminal device 110 may receive the first type of paging message including the conventional paging message. In some embodiments, the network device 120 may transmit (4005) a configuration indicating the above threshold to the terminal device 110. The configuration may be transmitted via SIB or RRC signaling. Alternatively, the above threshold may be predefined at the terminal device 110.
[0081] In some embodiments, the terminal device 110 determines whether the condition is satisfied based on the measured channel condition and a timer (also referred to as “first timer” hereinafter) , in order to avoid frequent switch. The terminal device 110 may not determine whether the condition is satisfied, until the first timer expires (in other words, during running time of the first timer) . For example, if the terminal device 110 starts to receive / monitor a paging message (i.e., the first type of paging message or the second type of message) , the first timer may be started. During running time of the first timer, the terminal device 110 may not determine whether the switch between different types of message is needed. After an expiration of the first timer, the terminal device 110 may determine whether the condition is satisfied. Specifically, if the measured channel quality (for example, RSRP) is not less than the threshold, the terminal device 110 may monitor / start to receive the first type of paging message, and may also start the first timer. If the measured channel quality is less than the threshold, the terminal device 110 may monitor / start to receive the second type of message including the robust notification information and may restart the first timer. In some embodiments, the first timers for the first type of paging message and the second type of message may be the same or different timers. In some embodiments, the network device 120 may transmit (4005) a configuration indicating the above threshold and the first timer to the terminal device 110. The configuration may be transmitted via SIB or RRC signaling.
[0082] In some embodiments, the terminal device 110 determines whether the condition is satisfied based on the measured channel condition and a time period, in order to avoid ping-pong issue. For example, if the measured channel quality remains less than the threshold for a time period, the terminal device 110 may monitor the second type of message from the network device 120. Conversely, if the measured channel quality remains not less than the threshold for the time period, the terminal device 110 may monitor the first type of paging message from the network device 120. Only as an example, if the RSRP being less than the threshold lasts for the time period, the terminal device 110 starts to receive the second type of message. If the RSRP being higher than the threshold lasts for the time period, the terminal device 110 may start to receive the first type of paging message. The time period may be configured (4005) by the network device 120, for example, via SIB or RRC signaling.
[0083] In some embodiments, the terminal device 110 determines whether the condition is satisfied based on the number of failed receptions. The failed receptions may contain at least one of a failed physical downlink control channel (PDCCH) detection, or a failed physical downlink shared channel (PDSCH) decoding. A higher layer (such as RRC layer) of the terminal device 110 may receive a failure indication regarding PDCCH detection or PDSCH decoding from a lower layer (such as, physical layer / layer 1) of the terminal device 110. For example, if the PDCCH detection fails, the physical layer 1 may notify the higher layer about the failure indication. Alternatively, or in addition, if the PDSCH decoding fails, the physical layer 1 may notify the higher layer about the failure indication.
[0084] In some embodiments, a counter is introduced to count the failure number of PDCCH detection / PDSCH decoding. In this case, the counter may be initially set to a predetermined number (referred to as “second predetermined number” hereinafter) , for example, zero, when the terminal device 110 camps on a cell or it is released by RRC message. If a failure indication is received from the lower layer, a value of the counter may be increased by another predetermined number (referred to as “first predetermined number” hereinafter, for example, one) . If the value of the counter reaches a threshold number, the terminal device 110 may determine that the condition is satisfied and monitor the second type of message. In some embodiments, the threshold number may be configured (4015) by the network device 120 via SIB1. The terminal device 110 may set the value of the counter to be the second predetermined number, after starting to monitor the second type of message. Alternatively, if the terminal device 110 receives the first type of paging message, the value of the counter may then set to be the second predetermined number.
[0085] Reference is made to FIG. 6A, the terminal device 110 may initially set the value of the counter to be 0. The value of the counter may be increased based on the number failure indications received from the lower layer at the time instants 610-1, 610-2, …, 610-N. If the threshold number is N, after receiving the failure indication at the time instant 610-N, the terminal device 110 may determine that the condition is satisfied and monitor the second type of message. Meanwhile, the counter may be cleared to the second predetermined number. It is noted that N can be any suitable number.
[0086] In some other embodiments, a predetermined number of consecutive failure indications (the maximum number of failure indications, such as N410) and a timer (also referred to as “second timer” hereinafter) are introduced for determining whether the condition is satisfied. The second timer and the predetermined number may be configured (4005) by SIB or RRC message. In this case, in some embodiments, if the predetermined number of consecutive failure indications regarding PDCCH detection or PDSCH decoding are received from the physical layer, the terminal device 110 may start the second timer. During running time of the second timer, if the first type of paging message is received, the terminal device 110 may stop the timer. Alternatively, if the second timer expires, the terminal device 110 may monitor the second type of message.
[0087] Reference is made to FIG. 6B, the terminal device 110 receives failure indications from the lower layer at the time instants 610-1, 610-2, …, 610-N. If the predetermined number is N, the terminal device 110 may start the second timer after receiving the failure indication at time instant 610-N. If the terminal device 110 receives the first type of paging message within running time 620 of the second timer, the second timer may be stopped. If the second timer expires, the terminal device 110 may determine that the condition is satisfied and monitor the second type of message after the expiration of the second timer.
[0088] According to example embodiments described with reference to FIG. 4, at a time the terminal device 110 only monitors the first or second type of message. In this way, it can reduce power consumption.
[0089] Reference is made to FIG. 7, which illustrates a signaling flow 700 of transmitting robust notification information in accordance with some embodiments of the present disclosure. For the purposes of discussion, the signaling flow 700 will be discussed with reference to FIG. 1, for example, by using the core network device 130 and the network device 120.
[0090] The core network device 130 transmits (7010) a paging message (for example, a conventional paging message) to the network device 120. In other words, the network device 120 receives (7010) the paging message from the core network device 130. The core network device 130 also transmits (7030) robust notification information to the network device 120 if a paging failure occurs. In other words, the network device 120 receives (7030) the robust notification information from the core network device 130. Example contents included in the robust notification information described with reference to FIG. 2 can also be implemented embodiments described with reference to FIG. 7, which are omitted here.
[0091] In some embodiments, if the conventional paging message is sent, but no paging response from the terminal device 110 has been received by the network device 120 (i.e. a paging failure occurs) , then the transmission of the robust notification information may be triggered. For example, after transmitting the paging message to the terminal device 110, if no paging response is received from the terminal device 110 , the network device 120 transmits (7015) a request for the robust notification information or a paging failure to the core network device 130. The request may be a new NG message or the current NG message. And if the core network device 130 receives (7015) the request from the network device 120, the core network device 130 transmits (7030) the robust notification information to the network device 120. The robust notification information may be included in paging message or a new message.
[0092] In some other embodiments, after transmitting (7010) the paging message to the network device 120, the core network device 130 starts (7020) a timer. And if there is no paging response being received during running time of the timer, the core network device 130 may transmit (7030) the robust notification information to the network device 120. In this embodiment, the timer may be a new timer or T3513. In some embodiments, the core network device 130 may retransmit the paging message during the running time of the timer.
[0093] Reference is made to FIG. 8A, the core network device 130 may start the timer after transmitting the paging message to network device 120 at time instant 810. If the core network device 130 receives the paging response within running time 820 of the timer, the timer may be stopped. If the timer expires at time instant 830, the core network device 130 may transmit the robust notification information to the network device.
[0094] In some further embodiments, after transmitting (7010) the paging message to the network device 120, the core network device 130 starts (7020) a timer. If the timer expires, the core network device 130 may retransmit (7025) a paging message to the network device 120 and increase a value of a counter by a predetermined number (for example, one) . And if the value of the counter reaches a threshold number, the core network device 130 may transmit (7030) the robust notification information to the network device 120. In this embodiment, the timer may be a new timer or T3513, and the threshold number may be defined as default value, such as 5.
[0095] Reference is made to FIG. 8B, the core network device 130 may start the timer after transmitting the paging message to network device 120 at time instant 811-1 and initially set the value of the counter to be 0. If the core network device 130 receives the paging response within running time 821 of the timer, the timer may be stopped. If the timer expires at time instant 811-2, the core network device 130 may retransmit the paging message and increase the value of the counter by the predetermined number.. If the threshold number is N (for example, N may be equal to 5) , after the timer expiring and the counter reaching the threshold number N at the time instant 831, the core network device 130 may transmit the robust notification information to the network device 120.
[0096] Reference is made to FIG. 9, which illustrates a signaling flow 900 of transmitting robust notification information in accordance with some embodiments of the present disclosure. The signaling flow 900 may be implemented between a first network device 910 and a second network device 920. In some embodiments, the first network device 910 is a centralized unit associated with the network device 120, and the second network device 920 is a distributed unit associated with the network device 120. Alternatingly, the first network device 910 may be the network device 120, and the second network device 920 may be another network device which is not shown.
[0097] The first network device 910 transmits (9010) robust notification information to the second network device 920. In other words, the second network device 920 receives (9010) robust notification information from the first network device 910. The robust notification information is used to inform a terminal device to move to a location with a better channel condition than a current location where a terminal device locates. In this embodiment, the robust notification information may include one or more of: user equipment (UE) identity information, an indication of the movement, and location information associated with the target location. Embodiments of transmission of the robust notification information are described below.
[0098] As mentioned above, the first network device 910 may be the network device 120, and the second network device 920 may be another network device. In this case, the first network device 910 which provides a last serving cell (i.e., cell 102) for the terminal device 110 may determine (9005) that a paging failure for the terminal device 110 occurs, if the first network device 910 does not receive a paging response for a paging message (i.e, the legacy paging message) from the terminal device 110. The first network device 910 may then transmit (9010) the robust notification information to the second network device 920 which belongs to a same paging area as the paging message. After receiving the robust notification information, the second network device 920 may consider that the conventional paging is failed, and the robust notification information can be sent to page the terminal device 110. In some embodiments, the robust notification information may be transmitted (9010) in Xn message. For example, the robust notification information may be transmitted in a reused paging message (such as X1 interface message) . Alternatively, the robust notification information may be transmitted in a new message. Table 2 below shows an example of information elements (IEs) included the robust notification information. It is noted that Table 2 is only an example not limitation.
[0099] Table 2
[0100] Alternatively, when the first network device 910 is a centralized unit associated with the network device 120 and the second network device 920 is a distributed unit associated with the network device 120, the robust notification information may be transmitted from the centralized unit to the distributed unit to page the terminal device 110. For example, the robust notification information may be transmitted in a message over an F1 interface message. Table 3 below shows an example of information elements (IEs) included the robust notification information. It is noted that Table 3 is only an example not limitation.
[0101] Table 3
[0102] It is noted that embodiments described with reference to FIG. 2 to FIG. 9 can be implemented separately or can be combined in any suitable manner.
[0103] FIG. 10 illustrates a flowchart of a communication method 1000 implemented at a terminal device, in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 1000 will be described from the perspective of the terminal device 110 in FIG. 1.
[0104] At block 1010, the terminal device 110 receives, from a network device 120, robust notification information that is used to inform the terminal device 110 to move to a location with a better channel condition than a current location where the terminal device 110 locates.
[0105] At block 1020, the terminal device 110 initiates a connection set up or resume procedure, after a time duration from the reception of the robust notification information.
[0106] In some example embodiments, the time duration is predefined.
[0107] In some example embodiments, the method comprises: receiving, from the network device 120, a configuration indicating the time duration, and wherein the configuration is in a system information block or a radio resource control message.
[0108] In some example embodiments, the robust notification information comprises location information associated with the location, and the method comprises: determining to initiate the connection set up or resuming procedure based on the location information.
[0109] In some example embodiments, the method comprises: determining a distance between the current location and the location based on the location information, and determining the time duration based on a distance between the current location and the location.
[0110] FIG. 11 illustrates a flowchart of a communication method 1100 implemented at a terminal device, in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 1100 will be described from the perspective of the terminal device 110 in FIG. 1.
[0111] At block 1110, in response to that the terminal device is able to monitor a first type of paging message and a second type of message, the terminal device 110 determine whether a condition for monitoring the second type of message is satisfied, wherein the second type of message comprises robust notification information that is used to inform the terminal device 110 to move to a location with a better channel condition than a current location where the terminal device 110 locates.
[0112] At block 1120, the terminal device 110 monitors the first or second type of message from a network device 120 based on the determination.
[0113] In some example embodiments, the method comprises: determining whether the condition is satisfied based on a measured channel condition between the terminal device 110 and the network device 120, wherein the measured channel condition comprises one of: reference signal received power (RSRP) , reference signal received quality (RSRQ) , signal to interference plus noise ratio (SINR) , and or received signal strength indication (RSSI) ; in response to the measured channel quality is less than a threshold, determining that the condition is satisfied; and in response to the measured channel quality is not less than the threshold, determining that the condition is unsatisfied.
[0114] In some example embodiments, the method comprises: in response to the measured channel quality is less than the threshold, monitoring the second type of message from the network device 120.
[0115] In some example embodiments, the method comprises: in response to the measured channel quality is not less than the threshold, monitoring the first type of paging message.
[0116] In some example embodiments, the method comprises: skipping the determination of whether the condition is satisfied during a running time of a first timer; and determining whether the condition is satisfied, after an expiration of the first timer.
[0117] In some example embodiments, the method comprises: in response to the measured channel quality remaining less than the threshold for a time duration, monitoring the second type of message from the network device 120.
[0118] In some example embodiments, the method comprises: in response to that the measured channel quality remaining not less than the threshold for a time duration, monitoring the first type of paging message from the network device 120.
[0119] In some example embodiments, the method comprises: receiving, from the network device 120, a configuration indicating at least one of: the first timer the threshold, or the time duration, and wherein the configuration is in a system information block or a radio resource control message.
[0120] In some example embodiments, the method comprises: determining whether the condition is satisfied based on the number of failed receptions, wherein the failed receptions comprise at least one of: a failed physical downlink control channel (PDCCH) reception, or a failed physical downlink shared channel (PDSCH) decoding.
[0121] In some example embodiments, the method comprises: in response to obtaining a failure indication regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device 110, increasing a value of a counter by a first predetermined number; in response to a value of the counter reaching a threshold number, determining that the condition is satisfied; and in response to the condition being satisfied, monitoring the second type of message from the network device 120.
[0122] In some example embodiments, the method comprises: setting the value of the counter to a second predetermined number, after starting to monitor the second type of message; or setting the value of the counter to the second predetermined number, after a reception of the first type of paging message from the network device 120.
[0123] In some example embodiments, the threshold is configured by the network device 120.
[0124] In some example embodiments, the method comprises: in response to obtaining a predetermined number of consecutive failure indications regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device 110, starting a second timer; and in response to receiving the first type of paging message during a running time of the second timer, causing the second timer to be stopped.
[0125] In some example embodiments, the method comprises: in response to obtaining a predetermined number of consecutive failure indications regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device, starting a second timer; and monitoring the second type of message, after an expiration of the second timer.
[0126] FIG. 12 illustrates a flowchart of a communication method 1200 implemented at a core network device, in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 1200 will be described from the perspective of the core network device 130 in FIG. 1.
[0127] At block 1210, the core network device 130 transmits, to a network device 120, a paging message.
[0128] At block 1220, the core network device 130 transmits, to the network device 120, robust notification information that is used to inform the terminal device 110 to move to a location with a better channel condition than a current location where a terminal device 110 locates.
[0129] In some example embodiments, the method comprises: receiving, from the network device 120, a request for the robust notification information or a paging failure; and transmitting, to the network device 120, the robust notification information.
[0130] In some example embodiments, the method comprises: starting a timer, after the transmission of the paging message; and in response no paging response being received during running time of the timer, transmitting, to the network device 120, the robust notification information.
[0131] In some example embodiments, the method comprises: starting a timer, after the transmission of the paging message; after an expiration of the timer, performing a retransmission of the paging message, increasing a value of a counter by a predetermined number; and in response to that the value of the counter reaching a threshold number, transmitting, to the network device 120, the robust notification information.
[0132] FIG. 13 illustrates a flowchart of a communication method 1300 implemented at a network device, in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 1300 will be described from the perspective of the network device in FIG. 1. The network device is a centralized unit, and the further network device is a distributed unit, or wherein the network device is a first centralized unit, and the further network device is a second centralized unit.
[0133] At block 1320, the network device transmits, to a further network device, robust notification information that is used to inform a terminal device to move to a location with a better channel condition than a current location where a terminal device locates, wherein the robust notification information comprises at least one of: user equipment (UE) identity information, an indication of the movement, or location information associated with the target location.
[0134] In some example embodiments, the method comprises: in response to not receiving, from the terminal device, a paging response for a paging message, determining (at block 1310) that a paging failure for the terminal device occurs; and transmitting the robust notification information to the further network device which belongs to a same paging area as the paging message.
[0135] In some example embodiments, the network device is a centralized unit, and the further network device is a distributed unit, or wherein the network device is a first centralized unit, and the further network device is a second centralized unit.
[0136] FIG. 14 is a simplified block diagram of a device 1400 that is suitable for implementing embodiments of the present disclosure. The device 1400 can be considered as a further example implementation of any of the devices as shown in FIG. 1. Accordingly, the device 1400 can be implemented at or as at least a part of the terminal device 110 or the network device 120.
[0137] As shown, the device 1400 includes a processor 1410, a memory 1420 coupled to the processor 1410, a suitable transceiver 1440 coupled to the processor 1410, and a communication interface coupled to the transceiver 1440. The memory 1420 stores at least a part of a program 1430. The transceiver 1440 may be for bidirectional communications or a unidirectional communication based on requirements. The transceiver 1440 may include at least one of a transmitter 1442 and a receiver 1444. The transmitter 1442 and the receiver 1444 may be functional modules or physical entities. The transceiver 1440 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements, such as X2 / Xn interface for bidirectional communications between eNBs / gNBs, S1 / NG interface for communication between a Mobility Management Entity (MME) / Access and Mobility Management Function (AMF) / SGW / UPF and the eNB / gNB, Un interface for communication between the eNB / gNB and a relay node (RN) , or Uu interface for communication between the eNB / gNB and a terminal device.
[0138] The program 1430 is assumed to include program instructions that, when executed by the associated processor 1410, enable the device 1400 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 1 to 14. The embodiments herein may be implemented by computer software executable by the processor 1410 of the device 1400, or by hardware, or by a combination of software and hardware. The processor 1410 may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor 1410 and memory 1420 may form processing means 1450 adapted to implement various embodiments of the present disclosure.
[0139] The memory 1420 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 1420 is shown in the device 1400, there may be several physically distinct memory modules in the device 1400. The processor 1410 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 1400 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
[0140] According to embodiments of the present disclosure, a terminal device, comprising a circuitry is provided. The circuitry is configured to: receive, from a network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and initiate a connection set up or resume procedure, after a time duration from the reception of the robust notification information. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device, as discussed above.
[0141] According to embodiments of the present disclosure, a terminal device, comprising a circuitry is provided. The circuitry is configured to: in response to that the terminal device is able to monitor a first type of paging message and a second type of message, determine whether a condition for monitoring the second type of message is satisfied, wherein the second type of message comprises robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and monitor the first or second type of message from a network device based on the determination. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device, as discussed above.
[0142] According to embodiments of the present disclosure, a core network device, comprising a circuitry is provided. The circuitry is configured to: transmit, to a network device, a paging message; and transmit, to the network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where a terminal device locates. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the core network device, as discussed above.
[0143] According to embodiments of the present disclosure, a network device, comprising a circuitry is provided. The circuitry is configured to: transmit, to a further network device, robust notification information that is used to inform a terminal device to move to a location with a better channel condition than a current location where a terminal device locates, wherein the robust notification information comprises at least one of: user equipment (UE) identity information, an indication of the movement, or location information associated with the target location. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device, as discussed above.
[0144] The term “circuitry” used herein may refer to hardware circuits and / or combinations of hardware circuits and software. For example, the circuitry may be a combination of analog and / or digital hardware circuits with software / firmware. As a further example, the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions. In a still further example, the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software / firmware for operation, but the software may not be present when it is not needed for operation. As used herein, the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and / or firmware.
[0145] According to embodiments of the present disclosure, a terminal device is provided. The terminal device comprises means for receiving, from a network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and means for initiating a connection set up or resume procedure, after a time duration from the reception of the robust notification information. In some embodiments, the first apparatus may comprise means for performing the respective operations of the method 1000. In some example embodiments, the terminal device may further comprise means for performing other operations in some example embodiments of the method 1000. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0146] According to embodiments of the present disclosure, a terminal device is provided. The terminal device comprises means for in response to that the terminal device is able to monitor a first type of paging message and a second type of message, determining whether a condition for monitoring the second type of message is satisfied, wherein the second type of message comprises robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and means for monitoring the first or second type of message from a network device based on the determination. In some embodiments, the second apparatus may comprise means for performing the respective operations of the method 1100. In some example embodiments, the terminal device may further comprise means for performing other operations in some example embodiments of the method 1100. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0147] According to embodiments of the present disclosure, a core network device is provided. The core network device comprises means for transmitting, to a network device, a paging message; and means for transmitting, to the network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where a terminal device locates. In some embodiments, the third apparatus may comprise means for performing the respective operations of the method 1200. In some example embodiments, the core network device may further comprise means for performing other operations in some example embodiments of the method 1200. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0148] According to embodiments of the present disclosure, a network device is provided. The a network device comprises means for transmitting, to a further network device, robust notification information that is used to inform a terminal device to move to a location with a better channel condition than a current location where a terminal device locates, wherein the robust notification information comprises at least one of: user equipment (UE) identity information, an indication of the movement, or location information associated with the target location. In some embodiments, the fourth apparatus may comprise means for performing the respective operations of the method 1300. In some example embodiments, the network device may further comprise means for performing other operations in some example embodiments of the method 1300. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0149] In summary, embodiments of the present disclosure provide the following aspects.
[0150] In an aspect, it is proposed a terminal device, comprising: a processor, configured to cause the terminal device to: receive, from a network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and initiate a connection set up or resume procedure, after a time duration from the reception of the robust notification information.
[0151] In some embodiments, the time duration is predefined.
[0152] In some embodiments, the terminal device is caused to: receive, from the network device, a configuration indicating the time duration, and wherein the configuration is in a system information block or a radio resource control message.
[0153] In some embodiments, the robust notification information comprises location information associated with the location, and wherein the terminal device is caused to: determine to initiate the connection set up or resume procedure based on the location information.
[0154] In some embodiments, the terminal device is caused to: determine a distance between the current location and the location based on the location information; and determine the time duration based on a distance between the current location and the location.
[0155] In an aspect, it is proposed a terminal device, comprising: a processor, configured to cause the terminal device to: in response to that the terminal device is able to monitor a first type of paging message and a second type of message, determine whether a condition for monitoring the second type of message is satisfied, wherein the second type of message comprises robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; and monitor the first type of paging message or the second type of message from a network device based on the determination.
[0156] In some embodiments, the terminal device is caused to: determine whether the condition is satisfied based on a measured channel condition between the terminal device and the network device, wherein the measured channel condition comprises one of: reference signal received power (RSRP) , reference signal received quality (RSRQ) , signal to interference plus noise ratio (SINR) , and or received signal strength indication (R SSI) ; in response to the measured channel quality is less than a threshold, determine that the condition is satisfied; and in response to the measured channel quality is not less than the threshold, determine that the condition is unsatisfied.
[0157] In some embodiments, the terminal device is caused to: in response to the measured channel quality is less than the threshold, monitor the second type of message from the network device.
[0158] In some embodiments, the terminal device is caused to: in response to the measured channel quality is not less than the threshold, monitor the first type of paging message.
[0159] In some embodiments, the terminal device is caused to: skip the determination of whether the condition is satisfied during a running time of a first timer; and determine whether the condition is satisfied, after an expiration of the first timer.
[0160] In some embodiments, the terminal device is caused to: in response to the measured channel quality remaining less than the threshold for a time duration, monitor the second type of message from the network device.
[0161] In some embodiments, the terminal device is caused to: in response to that the measured channel quality remaining not less than the threshold for a time duration, monitor the first type of paging message from the network device.
[0162] In some embodiments, the terminal device is caused to: receive, from the network device, a configuration indicating at least one of: the first timer the threshold, or the time duration, and wherein the configuration is in a system information block or a radio resource control message.
[0163] In some embodiments, the terminal device is caused to: determine whether the condition is satisfied based on the number of failed receptions, wherein the failed receptions comprise at least one of: a failed physical downlink control channel (PDCCH) reception, or a failed physical downlink shared channel (PDSCH) decoding.
[0164] In some embodiments, the terminal device is caused to: in response to obtaining a failure indication regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device, increase a value of a counter by a first predetermined number; in response to a value of the counter reaching a threshold number, determine that the condition is satisfied; and in response to the condition being satisfied, monitor the second type of message from the network device.
[0165] In some embodiments, the terminal device is caused to: set the value of the counter to a second predetermined number, after starting to monitor the second type of message; or set the value of the counter to the second predetermined number, after a reception of the first type of paging message from the network device.
[0166] In some embodiments, the threshold is configured by the network device.
[0167] In some embodiments, the terminal device is caused to: in response to obtaining a predetermined number of consecutive failure indications regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device, start a second timer; and in response to receiving the first type of paging message during a running time of the second timer, cause the second timer to be stopped.
[0168] In some embodiments, the terminal device is caused to: in response to obtaining a predetermined number of consecutive failure indications regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device, start a second timer; and monitor the second type of message, after an expiration of the second timer.
[0169] In an aspect, it is proposed a core network device, comprising: a processor, configured to cause the core network device to: transmit, to a network device, a paging message; and transmit, to the network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where a terminal device locates.
[0170] In some embodiments, the core network device is caused to: receive, from the network device, a request for the robust notification information or a paging failure; and transmit, to the network device, the robust notification information.
[0171] In some embodiments, the core network device is caused to: start a timer, after the transmission of the paging message; and in response no paging response being received during running time of the timer, transmit, to the network device, the robust notification information.
[0172] In some embodiments, the core network device is caused to: start a timer, after the transmission of the paging message; after an expiration of the timer, perform a retransmission of the paging message, increase a value of a counter by a predetermined number; and in response to that the value of the counter reaching a threshold number, transmit, to the network device, the robust notification information.
[0173] In an aspect, it is proposed a network device, comprising: a processor, configured to cause the network device to: transmit, to a further network device, robust notification information that is used to inform a terminal device to move to a location with a better channel condition than a current location where a terminal device locates, wherein the robust notification information comprises at least one of: user equipment (UE) identity information, an indication of the movement, or location information associated with the target location.
[0174] In some embodiments, the network device is caused to: in response to not receiving, from the terminal device, a paging response for a paging message, determine that a paging failure for the terminal device occurs; and transmit the robust notification information to the further network device which belongs to a same paging area as the paging message.
[0175] In some embodiments, the network device is a centralized unit, and the further network device is a distributed unit, or wherein the network device is a first centralized unit, and the further network device is a second centralized unit.
[0176] In an aspect, a terminal device, comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the terminal device, discussed above.
[0177] In an aspect, a core network device, comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the core network device, discussed above.
[0178] In an aspect, a network device, comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the network device, discussed above.
[0179] In an aspect, a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device, discussed above.
[0180] In an aspect, a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the core network device, discussed above.
[0181] In an aspect, a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the network device, discussed above.
[0182] In an aspect, a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device, discussed above.
[0183] In an aspect, a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the core network device, discussed above.
[0184] In an aspect, a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the network device, discussed above.
[0185] Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0186] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to FIGS. 1 to 14. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
[0187] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
[0188] The above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0189] Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
[0190] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims
1.A terminal device, comprising:a processor, configured to cause the terminal device to:receive, from a network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; andinitiate a connection set up or resume procedure, after a time duration from the reception of the robust notification information.2.The terminal device of claim 1, wherein the time duration is predefined.3.The terminal device of claim 1, wherein the terminal device is caused to:receive, from the network device, a configuration indicating the time duration, and wherein the configuration is in a system information block or a radio resource control message.4.The terminal device of claim 1, wherein the robust notification information comprises location information associated with the location, and wherein the terminal device is caused to:determine to initiate the connection set up or resume procedure based on the location information.5.The terminal device of claim 4, wherein the terminal device is caused to:determine a distance between the current location and the location based on the location information; anddetermine the time duration based on a distance between the current location and the location.6.A terminal device, comprising:a processor, configured to cause the terminal device to:in response to that the terminal device is able to monitor a first type of paging message and a second type of message, determine whether a condition for monitoring the second type of message is satisfied, wherein the second type of message comprises robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; andmonitor the first type of paging message or the second type of message from a network device based on the determination.7.The terminal device of claim 6, wherein the terminal device is caused to:determine whether the condition is satisfied based on a measured channel condition between the terminal device and the network device, wherein the measured channel condition comprises one of: reference signal received power (RSRP) , reference signal received quality (RSRQ) , signal to interference plus noise ratio (SINR) , and or received signal strength indication (RSSI) ;in response to the measured channel quality is less than a threshold, determine that the condition is satisfied; andin response to the measured channel quality is not less than the threshold, determine that the condition is unsatisfied.8.The terminal device of claim 7, wherein the terminal device is caused to:in response to the measured channel quality is less than the threshold, monitor the second type of message from the network device.9.The terminal device of claim 7, wherein the terminal device is caused to:in response to the measured channel quality is not less than the threshold, monitor the first type of paging message.10.The terminal device of any of claims 6-9, wherein the terminal device is caused to:skip the determination of whether the condition is satisfied during a running time of a first timer; anddetermine whether the condition is satisfied, after an expiration of the first timer.11.The terminal device of claim 6, wherein the terminal device is caused to:in response to the measured channel quality remaining less than the threshold for a time duration, monitor the second type of message from the network device.12.The terminal device of claim 6, wherein the terminal device is caused to:in response to that the measured channel quality remaining not less than the threshold for a time duration, monitor the first type of paging message from the network device.13.The terminal device of any of claims 10-12, wherein the terminal device is caused to:receive, from the network device, a configuration indicating at least one of: the first timer the threshold, or the time duration, and wherein the configuration is in a system information block or a radio resource control message.14.The terminal device of claim 6, wherein the terminal device is caused to:determine whether the condition is satisfied based on the number of failed receptions, wherein the failed receptions comprise at least one of: a failed physical downlink control channel (PDCCH) detection, or a failed physical downlink shared channel (PDSCH) decoding.15.The terminal device of claim 14, wherein the terminal device is caused to:in response to obtaining a failure indication regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device, increment a value of a counter by a first predetermined number;in response to a value of the counter reaching a threshold number, determine that the condition is satisfied; andin response to the condition being satisfied, monitor the second type of message from the network device.16.The terminal device of claim 14, wherein the terminal device is caused to:set the value of the counter to a second predetermined number, after starting to monitor the second type of message; orset the value of the counter to the second predetermined number, after a reception of the first type of paging message from the network device.17.The terminal device of claim 15 or 16, wherein the threshold is configured by the network device.18.The terminal device of claim 14, wherein the terminal device is caused to:in response to obtaining a predetermined number of consecutive failure indications regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device, start a second timer; andin response to receiving the first type of paging message during a running time of the second timer, cause the second timer to be stopped.19.The terminal device of claim 14, wherein the terminal device is caused to:in response to obtaining a predetermined number of consecutive failure indications regarding PDCCH detection or PDSCH decoding from a physical layer of the terminal device, start a second timer; andmonitor the second type of message, after an expiration of the second timer.20.A communication method implemented at a terminal device, comprising:receiving, from a network device, robust notification information that is used to inform the terminal device to move to a location with a better channel condition than a current location where the terminal device locates; andinitiating a connection set up or resume procedure, after a time duration from the reception of the robust notification information.
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