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WO2025091443A1 - Libération de ressources de signal de référence de sondage - Google Patents

Libération de ressources de signal de référence de sondage Download PDF

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Publication number
WO2025091443A1
WO2025091443A1 PCT/CN2023/129504 CN2023129504W WO2025091443A1 WO 2025091443 A1 WO2025091443 A1 WO 2025091443A1 CN 2023129504 W CN2023129504 W CN 2023129504W WO 2025091443 A1 WO2025091443 A1 WO 2025091443A1
Authority
WO
WIPO (PCT)
Prior art keywords
tat
network device
srs
terminal device
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2023/129504
Other languages
English (en)
Inventor
Yan Meng
Tao Tao
Jianguo Liu
Hyun-Su Cha
Sean Kelley
Gilsoo LEE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Original Assignee
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co Ltd, Nokia Solutions and Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co Ltd
Priority to PCT/CN2023/129504 priority Critical patent/WO2025091443A1/fr
Priority to CN202411340196.9A priority patent/CN119946855A/zh
Publication of WO2025091443A1 publication Critical patent/WO2025091443A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • Various example embodiments relate to the field of communication and in particular, to devices, methods, apparatuses and a computer readable storage medium for sounding reference signal (SRS) resource release.
  • SRS sounding reference signal
  • LPHAP low power high accuracy positioning
  • NR new radio
  • the enhancements for enabling LPHAP have been defined, e.g., extending extended discontinuous reception (eDRX) cycle beyond 10.24s in RRC_INACTIVE state towards meeting the battery life requirement for LPHAP.
  • the enhancements further include: for uplink (UL) positioning or downlink (DL) and UL positioning for UEs in RRC_INACTIVE state, specifying SRS configuration enhancements based on SRS positioning validity area to avoid frequent radio resource control (RRC) connection for SRS configuration or reconfiguration.
  • RRC radio resource control
  • SRS resource configurations in a communication network can still be optimized and improved, particularly for the LPHAP.
  • example embodiments of the present disclosure provide a solution for SRS resource release.
  • a first network device comprising at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first network device at least to: transmit information to a location management function (LMF) , wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • LMF location management function
  • SRS sounding reference signal
  • TAT time alignment timer
  • a location management function comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first network device at least to: receive information from a first network device, wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area; and transmit the information to the one or more network devices .
  • SRS sounding reference signal
  • a second network device comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second network device at least to: receive information from a location management function (LMF) , wherein the information is used for one or more network devices other than a first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area, wherein the second network device is one of the one or more network devices; and release the at least one SRS resource based on the information.
  • LMF location management function
  • TAT time alignment timer
  • a terminal device comprising at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first network device at least to: transmit, to a first network device, a request for an extension of a time alignment timer (TAT) ; and receive, from the first network device, information indicating a time period for which the TAT is extended.
  • TAT time alignment timer
  • a method at a first network device comprises transmitting information to a location management function (LMF) , wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • LMF location management function
  • SRS sounding reference signal
  • TAT time alignment timer
  • a method at a location management function comprises receiving information from a first network device, wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area; and transmitting the information to the one or more network devices.
  • SRS sounding reference signal
  • TAT time alignment timer
  • a method at a second network device comprises receiving information from a location management function (LMF) , wherein the information is used for one or more network devices other than a first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area, wherein the second network device is one of the one or more network devices; and releasing the at least one SRS resource based on the information.
  • LMF location management function
  • TAT time alignment timer
  • a method at a terminal device comprises transmitting, to a first network device, a request for an extension of a time alignment timer (TAT) ; and receiving, from the first network device, information indicating a time period for which the TAT is extended.
  • TAT time alignment timer
  • an apparatus of first network device comprises means for transmitting information to a location management function (LMF) , wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • LMF location management function
  • SRS sounding reference signal
  • TAT time alignment timer
  • an apparatus of location management function comprises means for receiving information from a first network device, wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area; and means for transmitting the information to the one or more network devices .
  • SRS sounding reference signal
  • TAT time alignment timer
  • an apparatus of second network device comprises means for receiving information from a location management function (LMF) , wherein the information is used for one or more network devices other than a first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area, wherein the second network device is one of the one or more network devices; and means for releasing the at least one SRS resource based on the information.
  • LMF location management function
  • TAT time alignment timer
  • an apparatus of terminal device comprises means for transmitting, to a first network device, a request for an extension of a time alignment timer (TAT) ; and means for receiving, from the first network device, information indicating a time period for which the TAT is extended.
  • TAT time alignment timer
  • a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to any one of the above fifth to eighth aspect.
  • a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to: transmit information to a location management function (LMF) , wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • LMF location management function
  • SRS sounding reference signal
  • TAT time alignment timer
  • a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to: receive information from a first network device, wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area; and transmit the information to the one or more network devices .
  • SRS sounding reference signal
  • a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to: receive information from a location management function (LMF) , wherein the information is used for one or more network devices other than a first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area, wherein the second network device is one of the one or more network devices; and release the at least one SRS resource based on the information.
  • LMF location management function
  • TAT time alignment timer
  • a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus at least to: transmit, to a first network device, a request for an extension of a time alignment timer (TAT) ; and receive, from the first network device, information indicating a time period for which the TAT is extended.
  • TAT time alignment timer
  • a first network device comprising transmitting circuitry configured to transmit information to a location management function (LMF) , wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • LMF location management function
  • SRS sounding reference signal
  • TAT time alignment timer
  • the location management function comprises receiving circuitry configured to receive information from a first network device, wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area; and transmitting circuitry configured to transmit the information to the one or more network devices.
  • SRS sounding reference signal
  • a second network device comprises receiving circuitry configured to receive information from a location management function (LMF) , wherein the information is used for one or more network devices other than a first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area, wherein the second network device is one of the one or more network devices; and releasing circuitry configured to release the at least one SRS resource based on the information.
  • LMF location management function
  • TAT time alignment timer
  • a terminal device comprising transmitting circuitry configured to transmit, to a first network device, a request for an extension of a time alignment timer (TAT) ; and receiving circuitry configured to receive, from the first network device, information indicating a time period for which the TAT is extended.
  • TAT time alignment timer
  • Fig. 1 illustrates an example network environment in which example embodiments of the present disclosure may be implemented
  • Fig. 2 illustrates an example signaling chart illustrating an example process according to some embodiments of the present disclosure
  • Fig. 3 illustrates an example procedure of proposed solution according to some embodiments of the present disclosure
  • Fig. 4 illustrates another example procedure of proposed solution according to some embodiments of the present disclosure
  • Fig. 5 illustrates a flowchart of a method implemented at a first network device according to some other embodiments of the present disclosure
  • Fig. 6 illustrates a flowchart of a method implemented at a LMF according to some other embodiments of the present disclosure
  • Fig. 7 illustrates a flowchart of a method implemented at a second network device according to some embodiments of the present disclosure
  • Fig. 8 illustrates a flowchart of a method implemented at a terminal device according to some other embodiments of the present disclosure
  • Fig. 9 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure.
  • Fig. 10 illustrates a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as long term evolution (LTE) , LTE-advanced (LTE-A) , wideband code division multiple access (WCDMA) , high-speed packet access (HSPA) , narrow band internet of things (NB-IoT) and so on.
  • LTE long term evolution
  • LTE-A LTE-advanced
  • WCDMA wideband code division multiple access
  • HSPA high-speed packet access
  • NB-IoT narrow band internet of things
  • the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, 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 future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, 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 future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the a
  • the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • RRU Remote Radio Unit
  • RH radio header
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a subscriber station (SS) , a portable subscriber station, a mobile station (MS) , or an access terminal (AT) .
  • UE user equipment
  • SS subscriber station
  • MS mobile station
  • AT access terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an internet of things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/
  • LPHAP has been introduced for further enhancement of 3GPP RAN1 NR positioning.
  • the enhancements for enabling LPHAP have been defined, e.g., eDRX cycle beyond 10.24s in RRC_INACTIVE state towards meeting the battery life requirement for LPHAP.
  • the enhancements further include: for uplink (UL) positioning or downlink (DL) and UL positioning for UEs in RRC_INACTIVE state, specifying SRS configuration enhancements based on SRS positioning validity area to avoid frequent radio resource control (RRC) connection for SRS configuration or reconfiguration.
  • RRC radio resource control
  • solutions for DL positioning reference signal (PRS) measurements for a UE in RRC_IDLE state and reporting of the measurements in RRC_CONNECTED state solutions for alignment between eDRX and PRS configurations, corresponding new core requirements, as well as identifying and specifying the impact on the RAN4 specification (including RRM measurements and procedures) are specified.
  • PRS DL positioning reference signal
  • a solution for SRS resource release.
  • a first network device transmits information to a location management function (LMF) , and the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires.
  • SRS sounding reference signal
  • TAT time alignment timer
  • Cells of the first network device and the one or more network devices are in the SRS validity area.
  • the first network device may indicate the information to other network devices of which cells in the SRS validity area to assist the SRS resource release. Therefore, the resource efficiency is improved by avoiding unnecessary resource reservation at all the cells in the SRS validity area.
  • Fig. 1 illustrates an example network environment 100 in which example embodiments of the present disclosure may be implemented.
  • the environment 100 which may be a part of a communication network, comprises terminal devices, network devices.
  • the network environment 100 may comprise a terminal device 110 (hereinafter may also be referred to as a UE 110) , a first network device 120, a LMF 130 and a second network device 140.
  • the first network device 120 can manage a cell 102
  • the second network device 140 can manage a cell 104.
  • the first network device 120 and the terminal device 110 can communicate with each other in the coverage of the cell 102.
  • the first network device 120 can communicate with the second network device 140 via the LMF 130.
  • the first network device 120 and the second network device may be in a validity area of a configuration of the SRS resource.
  • a link from the terminal device 110 to the first network device 120 is referred to as an uplink (UL)
  • a link from the first network device 120 to the terminal device 110 is referred to as a downlink (DL) .
  • the system 100 may include any suitable number of devices adapted for implementing embodiments of the present disclosure. Although not shown, it would be appreciated that one or more terminal devices or second network devices may be located in the environment 100.
  • Communications in the communication system 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) and the fifth generation (5G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • s cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) and the fifth generation (5G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • IEEE Institute for Electrical and Electronics Engineers
  • the communication may utilize any proper wireless communication technology, comprising but not limited to: code division multiple access (CDMA) , frequency division multiple access (FDMA) , time division multiple access (TDMA) , frequency division duplex (FDD) , time division duplex (TDD) , multiple-input multiple-output (MIMO) , orthogonal frequency division multiple (OFDM) , discrete Fourier transform spread OFDM (DFT-s-OFDM) and/or any other technologies currently known or to be developed in the future.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • FDD frequency division duplex
  • TDD time division duplex
  • MIMO multiple-input multiple-output
  • OFDM orthogonal frequency division multiple
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • Fig. 2 illustrates a signaling chart illustrating an example process 200 according to some embodiments of the present disclosure.
  • the process 200 will be described with reference to Fig. 1.
  • the process 200 may involve the terminal device 110, the first network device 120, the LMF 130 and the second network device 140. It would be appreciated that although the process 200 has been described in the communication environment 100 of Fig. 1, this process may be likewise applied to other communication scenarios with similar issues.
  • the first network device 120 transmits 205 information 210 to the LMF 130.
  • the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of the terminal device 110 in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires.
  • TAT is an area-specific TAT of the SRS validity area.
  • Cells of the first network device 120 and the one or more network devices are in the SRS validity area.
  • the terminal device 110 may be in inactive state, and the first network device 120 configured the SRS resource for the terminal device 110 before the terminal device 110 enters inactive state.
  • the last serving cell i.e., the serving cell managed by the first network device 120
  • the validity area i.e., the cells managed by the one or more network devices
  • the information 210 may comprise a first indication to release the at least one SRS resource, and the first indication is transmitted in the event that the TAT expires.
  • the first network device 120 may transmit network explicitly indication. For instance, when the area-specific TAT expires, the last serving gNB (corresponding to the first network device 120) will indicate all the cells in the validity area to release the SRS resource.
  • the first network device 120 may transmit a third indication to the LMF 130 to reserve the at least one SRS resource. For example, when an expired TAT restarts, the last serving gNB will indicate the cells in the validity area to reserve previously released SRS resource again. Additionally, the first network device 120 may reuse at least one released SRS resource valid for multiple cells of the terminal device after the expired TAT restarts. In addition, the terminal device 110 may reuse at least one released SRS resource valid for multiple cells of the terminal device 110 after an expired TAT restarts.
  • the LMF 130 may receive the third indication from the first network device in the event that an expired TAT restarts, then the LMF 130 may transmit the third indication to the one or more network devices.
  • the second network device 140 may receive a third indication from the LMF to reserve the at least one SRS resource in the event that the expired TAT restarts, then second network device 140 may reserve the at least one SRS resource based on the third indication.
  • the terminal device 110 may use the previously released SRS resource again when the expired TAT is reset or restarted.
  • the last serving cell will trigger all the cells in the validity area to reserve previously released SRS resource again.
  • the information 210 may comprise information of the TAT, a second indication that the terminal device 110 moves out of the SRS validity area, or any combination of two of the above-mentioned items. Additionally or alternatively, the information of the TAT may include: a time point when the TAT starts, a time point when the TAT restarts, an extension of the TAT, a time point when the TAT expires, or any combination of two or more of the above-mentioned items.
  • the LMF 130 receives 215 the information 210 from the first network device 120.
  • the LMF 130 transmits 220 information 210 to the second network device 140.
  • the second network device 140 receives 230 information 210 from the LMF 130. Based on the information, the second network device 140 release 265 the at least one SRS resource.
  • the TAT can be synchronized at each cell in the validity area, and the cells in the validity area may autonomously release SRS resource.
  • the serving cell corresponding to the first network device 120
  • the serving cell may indicate the cells in the validity area to start or restart the TAT.
  • the validity time value of the TAT nay also be indicated to the cells in the validity area when the SRS resource is configured.
  • the cells in the validity area can know when the TAT expires.
  • the cells in the validity area may autonomously release the SRS resource when the TAT expires.
  • the second network device 140 may release the at least one SRS resource upon receiving the first indication. In some other embodiments, the second network device 140 may release the at least one SRS resource upon expiration of the TAT. In some other embodiments, the second network device 140 may release the at least one SRS resource based on determining that the terminal device moves out of the SRS validity area.
  • the second network device 140 may reserve the at least one SRS resource. Additionally, if the information of the TAT includes the extension of the TAT, the second network device 140 may extend a time period for the at least one SRS resource.
  • the terminal device 110 transmit 235 a request for an extension of a TAT 240 to the first network device 120.
  • the first network device 120 transmits 250 information indicating a time period for which the TAT is extended to the terminal device 110.
  • the terminal device 110 receives 260 the information indicating the time period 255 from the first network device 120.
  • the first network device 120 may receive at least one request for an extension of the TAT from at least one terminal device or the LMF 130.
  • the terminal device is allowed to send a request of TAT extension before the area-specific TAT expires.
  • the first network device 120 may determine to extend the TAT for a time period. Then the first network device 120 may extend validity time of the TAT based on the time period.
  • a single report is sufficient for an extension.
  • the report may comprise a request for an extension of the TAT.
  • the terminal device Upon sending a request, the terminal device shall reset the area-specific TAT for an extension.
  • the first network device 120 will automatically grant an extension of validity area configuration for the reporting terminal device.
  • the decision of the serving cell will be indicated to neighboring cells (i.e., all the cells in the validity area other than the serving cell) .
  • multiple reports are required for an extension. If a number of terminal devices send TAT extension requests (e.g., the number of requests is larger than a threshold) before the area-specific timer expires, the triggering of SRS configuration release is delayed by a certain time period.
  • the first network device 120 may receive a request for an extension of the TAT from at least one of the LMF 130 or the at least one terminal device.
  • the LMF 130 may transmit a request for an extension of the TAT to the first network device.
  • the time synchronization could be still valid when the TAT expires.
  • the terminal device may send a request of “TAT extension. ”
  • the LMF 130 may send a request of “TAT extension” to the first network device 120.
  • the terminal device 110 may determine a time period for which the TAT is extended. In addition, the terminal device 110 may transmit information indicating a time period for which the TAT is extended to the first network device 120. Additionally, the terminal device 110 may extend validity time of the TAT based on the time period.
  • the first network device 120 may receive information indicating a time period for which the TAT is extended from the at least one terminal device. Then the first network device 120 may extend validity time of the TAT based on the time period.
  • the first network device 120 may transmit information indicating the time period to the at least one terminal device.
  • the first network device 120 may transmit a fourth indication that the TAT is extended to the LMF 130.
  • the time period may be determined by at least one terminal device or the first network device 120.
  • the first network device 120 may indicate the time period to the at least one terminal device and the one or more network devices for autonomous extension of the area-specific TAT.
  • the LMF 130 may receive a fourth indication that the TAT is extended from the first network device 120. Then the LMF 130 may transmit the fourth indication to the one or more network devices. Additionally, the fourth indication may comprise information indicating the time period.
  • the second network device 140 may receive information indicating a time period for which the TAT is extended from the LMF 130. Then the second network device 140 may extend validity time of the TAT based on the time period, and run the TAT based on the validity time.
  • the time period may be proportional to a number of the at least one request. In another example, the time period may be an integer multiple of a duration of the TAT. For instance, the second network device 140 may run the TAT upon receiving the time period from the LMF 130.
  • a triggering delay period can be proportional to the number of requests.
  • the delay period can be given by an integer time of the area-specific TAT period.
  • the first network device 120 may indicate the integer value to the terminal device and the one or more network devices for autonomous extension of the area-specific TAT.
  • the first network device 120 may release the at least one SRS resource if the TAT expires. Additionally or alternatively, if the terminal device 110 moves out of the SRS validity area, the first network device 120 may release the at least one SRS resource.
  • the first network device 120 may release a configuration of the at least one SRS resource configured for the SRS validity area. Additionally or alternatively, if the terminal device 110 moves out of the SRS validity area, the first network device 120 may release the configuration of the at least one SRS resource configured for the SRS validity area. It is to be understood that the configuration of the at least one SRS resource may be the area-specific SRS configuration.
  • the second network device 140 may release a configuration of the at least one SRS resource configured for the SRS validity area. Additionally or alternatively, if the terminal device 110 moves out of the SRS validity area, the second network device 140 may release the configuration of the at least one SRS resource configured for the SRS validity area.
  • the terminal device 110 may release the at least one SRS resource. Additionally or alternatively, if the terminal device 110 moves out of the SRS validity area, the terminal device 110 may release the at least one SRS resource.
  • the (last) serving cell may indicate the TAT information (i.e., TAT expiration, the TAT is started/restarted and the validity time of the TAT) to other cells in the validity area to assist the SRS resource release.
  • TAT expiration the TAT is started/restarted and the validity time of the TAT
  • the SRS resource release and indication has associated with TAT, and the SRS resource release is efficiently triggered at the cells in the validity area when the TAT expires. This is helpful to improve the resource efficiency by avoiding unnecessary resource reservation at all the cells in the validity area. Thereby, the waste of resource is reduced.
  • Fig. 3 illustrates an example procedure of proposed solution according to some embodiments of the present disclosure.
  • the procedure 300 may involve a UE 301, a last serving cell 302, a LMF 303, and cells in the validity area 304.
  • the process 300 can be considered as a more specific example of the process 200 in Fig. 2.
  • the UE 301 in Fig. 3 may be an example of the terminal device 110 in Fig. 1 or Fig. 2
  • the last serving cell 302 in Fig. 3 may correspond to the first network device 120 in Fig. 1 or Fig. 2
  • the LMF 303 in Fig. 3 may be an example of the LMF 130 in Fig. 1 or Fig. 2
  • the cells in the validity area 304 in Fig. 3 may correspond to the second network device 140 in Fig. 1 or Fig. 2.
  • the UE 301 receive a TA command from the last serving cell 302, then the TAT starts. Prior to receiving the TA command, the UE 301 may transmit a request for starting the TAT.
  • the last serving cell refers to the cell managed by the base station that sets the SRS resource configuration for the UE 301 before UE 301 enters inactive state.
  • the UE 301 requests TAT extension from the last serving cell 302.
  • the last serving cell 302 provides extension time to the UE 301, and the TAT is extended.
  • the expiration of the TAT triggers the SRS resource release.
  • the last serving cell 302 is triggered to release the SRS resource.
  • the last serving cell 302 transmits a SRS resource release indication to the LMF 303.
  • the LMF 303 transmits the SRS resource release indication to the cells in the validity area 304.
  • the validity area refers to the validity area of the SRS, and the last serving cell 302 and the cells in the validity area 304 in a same validity area of the SRS.
  • the cells in the validity area 304 releases the SRS resource.
  • the UE 301 receive a TA command from the last serving cell 302, then the expired TAT restarts.
  • the UE 301 reuses previously released SRS resource.
  • the UE 301 may transmit a request for restarting the TAT via random access channel (RACH) .
  • RACH random access channel
  • the last serving cell 302 transmits a SRS resource reservation indication to the LMF 303.
  • the LMF 303 transmits the SRS resource reservation indication to the cells in the validity area 304.
  • the cells in the validity area 304 reserves the previously SRS resource.
  • Fig. 3 shows an example of SRS resource release and reservation by network explicit indication.
  • the cells in the validity area have no information about the TAT.
  • the SRS resource release and reservation at cells in the validity area could be indicated by the last serving cell via LMF.
  • Fig. 4 illustrates another example procedure of proposed solution according to some embodiments of the present disclosure.
  • the procedure 400 may involve a UE 401, a last serving cell 402, a LMF 403, and cells in the validity area 404.
  • the process 400 can be considered as a more specific example of the process 200 in Fig. 2.
  • the UE 401 in Fig. 4 may be an example of the terminal device 110 in Fig. 1 or Fig. 2
  • the last serving cell 402 in Fig. 4 may correspond to the first network device 120 in Fig. 1 or Fig. 2
  • the LMF 403 in Fig. 4 may be an example of the LMF 130 in Fig. 1 or Fig. 2
  • the cells in the validity area 404 in Fig. 4 may correspond to the second network device 140 in Fig. 1 or Fig. 2.
  • the UE 401 receive a TA command from the last serving cell 402, then the TAT starts. Prior to receiving the TA command, the UE 401 may transmit a request for starting the TAT.
  • the last serving cell refers to the cell managed by the base station that sets the SRS resource configuration for the UE 401 before UE 401 enters inactive state.
  • the last serving cell 402 indicates to the LMF 403 that the TAT starts.
  • the LMF 403 indicates to the cells in the validity area 404 that the TAT starts.
  • the UE 401 requests TAT extension from the last serving cell 402.
  • the last serving cell 402 provides extension time to the UE 401, and the TAT is extended.
  • the last serving cell 402 indicates to the LMF 403 that the extension of the TAT.
  • the LMF 403 indicates to the cells in the validity area 404 that the extension of the TAT.
  • the expiration of the TAT triggers the SRS resource release.
  • the last serving cell 402 is triggered to release the SRS resource.
  • the cells in the validity area 404 is triggered to release the SRS resource.
  • the UE 401 receive a TA command from the last serving cell 402, then the expired TAT restarts.
  • the UE 401 reuses previously released SRS resource.
  • the UE 401 may transmit a request for restarting the TAT via random access channel (RACH) .
  • RACH random access channel
  • the last serving cell 402 indicates to the LMF 403 that the expired TAT restarts.
  • the LMF 403 indicates to the cells in the validity area 404 that the expired TAT restarts.
  • the cells in the validity area 404 reserves the previously SRS resource.
  • Fig. 4 shows an example of SRS resource release and reservation by TAT synchronization between cells in the validity area.
  • the cells in the validity area have known information about the TAT, such as when the TAT starts, restarts, TAT extension and TAT expires, etc.
  • cells in the validity area can release or reserve the SRS resource autonomously based on the TAT.
  • the TAT extension is performed before the TAT expiration. Additionally or alternatively, the TAT extension may also be performed after the TAT expiration. For example, according to the TA validation criterion based on RSRP, it could be still valid. To avoid the SRS resource re-configuration, the UE or LMF may send request to “TAT extension. ” It is assumed that the validity time of the TAT is pre-configured before the last serving cell sends the TA commands.
  • Fig. 5 shows a flowchart of an example method 500 implemented at a first network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 500 will be described from the perspective of the first network device 120 with reference to Fig. 1.
  • the first network device 120 transmits information to a location management function (LMF) , wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • LMF location management function
  • TAT time alignment timer
  • the information may comprise a first indication to release the at least one SRS resource, and wherein the first indication is transmitted based on determining that the TAT expires.
  • the information may comprise information of the TAT, a second indication that the terminal device moves out of the SRS validity area, or any combination of two of the above-mentioned items.
  • information of the TAT may include a time point when the TAT starts, a time point when the TAT restarts, an extension of the TAT, a time point when the TAT expires, or any combination of two or more of the above-mentioned items.
  • the first network device 120 may further transmit, to the LMF, a third indication to reserve the at least one SRS resource based on determining that an expired TAT restarts. In some embodiments, the first network device 120 may further reuse at least one released SRS resource valid for multiple cells of the terminal device after the expired TAT restarts.
  • the first network device 120 may further receive, from at least one terminal device or the LMF, at least one request for an extension of the TAT before the TAT expires.
  • the first network device 120 may further determine to extend the TAT for a time period based on determining that a number of the at least one terminal device is above a threshold, and extend validity time of the TAT based on the time period.
  • the first network device 120 may further receive a request for an extension of the TAT from the at least one terminal device or the LMF upon expiration of the TAT.
  • the first network device may further receive, from the at least one terminal device, information indicating a time period for which the TAT is extended, and extend validity time of the TAT based on the time period.
  • the time period may be proportional to a number of the at least one request, or the time period may be an integer multiple of a duration of the TAT.
  • the first network device 120 may further transmit, to the at least one terminal device, information indicating the time period.
  • the first network device 120 may further transmit, to the LMF, a fourth indication that the TAT is extended.
  • the fourth indication may comprise information indicating the time period.
  • the first network device may further release the at least one SRS resource based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • the first network device 120 may further release a configuration of the at least one SRS resource configured for the SRS validity area based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • Fig. 6 shows a flowchart of an example method 600 implemented at a LMF in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 600 will be described from the perspective of the LMF 130 with reference to Fig. 1.
  • the LMF 130 receives information from a first network device, wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • SRS sounding reference signal
  • TAT time alignment timer
  • the LMF 130 transmits the information to the one or more network devices.
  • the information may comprise a first indication to release the at least one SRS resource, and wherein the first indication is transmitted based on determining that the TAT expires.
  • the information may comprise information of the TAT, a second indication that the terminal device moves out of the SRS validity area, or any combination of two of the above-mentioned items.
  • the information of the TAT may include a time point when the TAT starts, a time point when the TAT restarts, an extension of the TAT, a time point when the TAT expires, or any combination of two or more of the above-mentioned items.
  • the first network device may further receive, from the first network device, a third indication to reserve the at least one SRS resource in the event that an expired TAT restarts, and transmit the third indication to the one or more network devices.
  • the LMF may further transmit, to the first network device, a request for an extension of the TAT upon expiration of the TAT. In some embodiments, the LMF may further receive, from the first network device, a fourth indication that the TAT is extended, and transmit the fourth indication to the one or more network devices.
  • the fourth indication may comprise information indicating a time period of the TAT is extended.
  • the time period may be proportional to a number of at least one request for an extension of the TAT transmitted by at least one terminal device, or the time period may be an integer multiple of a duration of the TAT.
  • Fig. 7 shows a flowchart of an example method 700 implemented at a second network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 700 will be described from the perspective of the second network device 140 with reference to Fig. 1.
  • the second network device 140 receives information from a location management function (LMF) , wherein the information is used for one or more network devices other than a first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area, wherein the second network device is one of the one or more network devices.
  • the second network device 140 releases the at least one SRS resource based on the information.
  • the information may comprise a first indication to release the at least one SRS resource, and wherein the first indication is transmitted based on determining that the TAT expires.
  • the information may comprise information of the TAT, a second indication that the terminal device moves out of the SRS validity area, or any combination of two of the above-mentioned items.
  • information of the TAT may include a time point when the TAT starts, a time point when the TAT restarts, an extension of the TAT, a time point when the TAT expires, or any combination of two or more of the above-mentioned items.
  • the second network device may release the at least one SRS resource upon receiving the first indication, release the at least one SRS resource based on determining that the terminal device moves out of the SRS validity area, or release the at least one SRS resource upon expiration of the TAT.
  • the second network device may further receive, from the LMF, a third indication to reserve the at least one SRS resource in the event that an expired TAT restarts, and reserve the at least one SRS resource based on the third indication.
  • the second network device may further reserve the at least one SRS resource based on determining that the information of the TAT includes a time point when the TAT restarts, or extend a time period for the at least one SRS resource based on determining that the information of the TAT includes the extension of the TAT.
  • the second network device may further receive, from the LMF, information indicating a time period for which the TAT is extended, and extend validity time of the TAT based on the time period.
  • the time period may be proportional to a number of the at least one request for an extension of the TAT transmitted by at least one terminal device, or the time period may be an integer multiple of a duration of the TAT.
  • the second network device may further release a configuration of the at least one SRS resource configured for the SRS validity area based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • Fig. 8 shows a flowchart of an example method 800 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the terminal device 110 with reference to Fig. 1.
  • the terminal device 110 transmits, to a first network device, a request for an extension of a time alignment timer (TAT) .
  • TAT time alignment timer
  • the terminal device 110 receives, from the first network device, information indicating a time period for which the TAT is extended.
  • the terminal device 110 may further determine a time period for which the TAT is extended. In some embodiments, the terminal device may further extend validity time of the TAT based on the time period. In some embodiments, the terminal device may further reuse at least one released SRS resource valid for multiple cells of the terminal device after an expired TAT restarts. In some embodiments, the terminal device may further release the at least one SRS resource based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • the terminal device 110 may further release a configuration of the at least one SRS resource configured for the SRS validity area based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • an apparatus capable of performing any of the method 500 (for example, the first network device 120) is provided.
  • the apparatus may comprise means for performing the respective steps of the method 500.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for transmitting information to a location management function (LMF) , wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area.
  • LMF location management function
  • SRS sounding reference signal
  • TAT time alignment timer
  • the information may comprise a first indication to release the at least one SRS resource, and wherein the first indication is transmitted based on determining that the TAT expires.
  • the information may comprise information of the TAT, a second indication that the terminal device moves out of the SRS validity area, or any combination of two of the above-mentioned items.
  • the information of the TAT may include a time point when the TAT starts, a time point when the TAT restarts, an extension of the TAT, a time point when the TAT expires, or any combination of two or more of the above-mentioned items.
  • the apparatus may further comprise means for transmitting, to the LMF, a third indication to reserve the at least one SRS resource based on determining that an expired TAT restarts.
  • the apparatus may further comprise means for reusing at least one released SRS resource valid for multiple cells of the terminal device after the expired TAT restarts. In some embodiments, the apparatus may further comprise means for receiving, from at least one terminal device or the LMF, at least one request for an extension of the TAT before the TAT expires.
  • the apparatus may further comprise means for determining to extend the TAT for a time period based on determining that a number of the at least one terminal device is above a threshold and means for extending validity time of the TAT based on the time period.
  • the apparatus may further comprise means for receiving a request for an extension of the TAT from the at least one terminal device or the LMF upon expiration of the TAT. In some embodiments, the apparatus may further comprise means for receiving, from the at least one terminal device, information indicating a time period for which the TAT is extended, and means for extending validity time of the TAT based on the time period.
  • the time period may be proportional to a number of the at least one request, or the time period may be an integer multiple of a duration of the TAT.
  • the apparatus may further comprise means for transmitting, to the at least one terminal device, information indicating the time period. In some embodiments, the apparatus may further comprise means for transmitting, to the LMF, a fourth indication that the TAT is extended.
  • the fourth indication may comprise information indicating the time period.
  • the apparatus may further comprise means for releasing the at least one SRS resource based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • the apparatus may further comprise means for releasing a configuration of the at least one SRS resource configured for the SRS validity area based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • the apparatus further comprises means for performing other steps in some embodiments of the method 500.
  • the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • an apparatus capable of performing any of the method 600 (for example, the LMF 130) is provided.
  • the apparatus may comprise means for performing the respective steps of the method 600.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for receiving information from a first network device, wherein the information is used for one or more network devices other than the first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area; and means for transmitting the information to the one or more network devices.
  • SRS sounding reference signal
  • TAT time alignment timer
  • the information may comprise a first indication to release the at least one SRS resource, and wherein the first indication is transmitted based on determining that the TAT expires.
  • the information may comprise information of the TAT, a second indication that the terminal device moves out of the SRS validity area, or any combination of two of the above-mentioned items.
  • information of the TAT may include a time point when the TAT starts, a time point when the TAT restarts, an extension of the TAT, a time point when the TAT expires, or any combination of two or more of the above-mentioned items.
  • the apparatus may further comprise means for receiving, from the first network device, a third indication to reserve the at least one SRS resource in the event that an expired TAT restarts, and means for transmitting the third indication to the one or more network devices.
  • the apparatus may further comprise means for transmitting, to the first network device, a request for an extension of the TAT upon expiration of the TAT.
  • the apparatus may further comprise means for receiving, from the first network device, a fourth indication that the TAT is extended, and means for transmitting the fourth indication to the one or more network devices.
  • the fourth indication may comprise information indicating a time period of the TAT is extended.
  • the time period may be proportional to a number of at least one request for an extension of the TAT transmitted by at least one terminal device, or the time period may be an integer multiple of a duration of the TAT.
  • the apparatus further comprises means for performing other steps in some embodiments of the method 600.
  • the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the device.
  • an apparatus capable of performing any of the method 700 (for example, the second network device 140) is provided.
  • the apparatus may comprise means for performing the respective steps of the method 700.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for receiving information from a location management function (LMF) , wherein the information is used for one or more network devices other than a first network device to release at least one sounding reference signal (SRS) resource valid for multiple cells of a terminal device in the event that a time alignment timer (TAT) configured for a SRS validity area of the terminal device expires, wherein cells of the first network device and the one or more network devices are in the SRS validity area, wherein the second network device is one of the one or more network devices; and means for releasing the at least one SRS resource based on the information.
  • LMF location management function
  • TAT time alignment timer
  • the information may comprise a first indication to release the at least one SRS resource, and wherein the first indication is transmitted based on determining that the TAT expires.
  • the information may comprise information of the TAT, a second indication that the terminal device moves out of the SRS validity area, or any combination of two of the above-mentioned items.
  • information of the TAT may include a time point when the TAT starts, a time point when the TAT restarts, an extension of the TAT, a time point when the TAT expires, or any combination of two or more of the above-mentioned items.
  • means for releasing the at least one SRS resource based on the information may comprise means for releasing the at least one SRS resource upon receiving the first indication, means for releasing the at least one SRS resource based on determining that the terminal device moves out of the SRS validity area, or means for releasing the at least one SRS resource upon expiration of the TAT.
  • the apparatus may further comprise means for receiving, from the LMF, a third indication to reserve the at least one SRS resource in the event that an expired TAT restarts, and means for reserving the at least one SRS resource based on the third indication.
  • the apparatus may further comprise means for reserving the at least one SRS resource based on determining that the information of the TAT includes a time point when the TAT restarts, or means for extending a time period for the at least one SRS resource based on determining that the information of the TAT includes the extension of the TAT.
  • the apparatus may further comprise means for receiving, from the LMF, information indicating a time period for which the TAT is extended, and means for extending validity time of the TAT based on the time period.
  • the time period may be proportional to a number of the at least one request for an extension of the TAT transmitted by at least one terminal device, or the time period may be an integer multiple of a duration of the TAT.
  • the apparatus may further comprise means for releasing a configuration of the at least one SRS resource configured for the SRS validity area based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • the apparatus further comprises means for performing other steps in some embodiments of the method 700.
  • the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the device.
  • an apparatus capable of performing any of the method 800 (for example, the terminal device 110) is provided.
  • the apparatus may comprise means for performing the respective steps of the method 800.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for transmitting, to a first network device, a request for an extension of a time alignment timer (TAT) ; and means for receiving, from the first network device, information indicating a time period for which the TAT is extended.
  • TAT time alignment timer
  • the apparatus may further comprise means for determining a time period for which the TAT is extended. In some embodiments, the apparatus may further comprise means for extending validity time of the TAT based on the time period.
  • the apparatus may further comprise means for reusing at least one released SRS resource valid for multiple cells of the terminal device after an expired TAT restarts. In some embodiments, the apparatus may further comprise means for releasing the at least one SRS resource based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • the apparatus may further comprise means for releasing a configuration of the at least one SRS resource configured for the SRS validity area based on determining at least one of the following: the TAT expires; or the terminal device moves out of the SRS validity area.
  • the apparatus further comprises means for performing other steps in some embodiments of the method 800.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the device.
  • FIG. 9 is a simplified block diagram of a device 900 that is suitable for implementing embodiments of the present disclosure.
  • the device 900 may be provided to implement the communication device, for example the terminal device 110, a first network device 120, a LMF 130 or a second network device 140 as shown in Fig. 1.
  • the device 900 includes one or more processors 910, one or more memories 920 coupled to the processor 910, and one or more communication modules 940 coupled to the processor 910.
  • the communication modules 940 is for bidirectional communications.
  • the communication modules 940 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 910 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 900 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.
  • the memory 920 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a read only memory (ROM) 924, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 922 and other volatile memories that will not last in the power-down duration.
  • a computer program 930 includes computer executable instructions that are executed by the associated processor 910.
  • the program 930 may be stored in the ROM 924.
  • the processor 910 may perform any suitable actions and processing by loading the program 930 into the RAM 922.
  • the embodiments of the present disclosure may be implemented by means of the program 930 so that the device 900 may perform any process of the disclosure as discussed with reference to Figs. 2 to 8.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 930 may be tangibly contained in a computer readable medium which may be included in the device 900 (such as in the memory 920) or other storage devices that are accessible by the device 900.
  • the device 900 may load the program 930 from the computer readable medium to the RAM 922 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 10 shows an example of the computer readable medium 1000 in form of CD or DVD.
  • the computer readable medium has the program 930 stored thereon.
  • 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 representations, it is to be understood that the block, apparatus, system, technique or method 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.
  • 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 method 500, 600, 700, and 800 as described above with reference to Figs. 5-8.
  • 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.
  • 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.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer 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 computer 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.
  • non-transitory is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs.ROM) .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon des modes de réalisation, la présente invention concerne la libération de ressources de signal de référence de sondage (SRS). Selon un aspect, un premier dispositif de réseau transmet des informations à une fonction de gestion de localisation (LMF), et les informations sont utilisées pour qu'un ou plusieurs dispositifs de réseau autres que le premier dispositif de réseau libèrent au moins une ressource SRS valide pour de multiples cellules d'un dispositif terminal dans le cas où un temporisateur d'alignement temporel (TAT) configuré pour une zone de validité de SRS du dispositif terminal expire. Les cellules du premier dispositif de réseau et desdits un ou plusieurs dispositifs de réseau sont dans la zone de validité de SRS. De cette manière, le premier dispositif de réseau peut indiquer les informations à d'autres dispositifs de réseau dont les cellules sont dans la zone de validité de SRS pour aider à la libération de ressources SRS. Par conséquent, l'efficacité des ressources est améliorée.
PCT/CN2023/129504 2023-11-03 2023-11-03 Libération de ressources de signal de référence de sondage Pending WO2025091443A1 (fr)

Priority Applications (2)

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PCT/CN2023/129504 WO2025091443A1 (fr) 2023-11-03 2023-11-03 Libération de ressources de signal de référence de sondage
CN202411340196.9A CN119946855A (zh) 2023-11-03 2024-09-25 探测参考信号资源释放

Applications Claiming Priority (1)

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PCT/CN2023/129504 WO2025091443A1 (fr) 2023-11-03 2023-11-03 Libération de ressources de signal de référence de sondage

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