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US-20260129570-A1 - Selection of Cell for Network Access in Cell Delegation Scenario

US20260129570A1US 20260129570 A1US20260129570 A1US 20260129570A1US-20260129570-A1

Abstract

The present disclosure is related to a UE, a network node, and methods for selecting a cell for network access in a cell delegation scenario. A method at a terminal device for selecting a cell for network access comprises: receiving one or more messages and/or signals indicating one or more configurations for selecting a cell; and selecting a cell from multiple cells comprising a first cell and one or more second cells based on at least the one or more configurations, wherein at least a part of transmission associated with the one or more second cells is delegated to the first cell.

Inventors

  • Rui Fan
  • Pål Frenger
  • Ali Nader
  • Nianshan Shi
  • Sina Maleki

Assignees

  • TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Dates

Publication Date
20260507
Application Date
20231009
Priority Date
20221104

Claims (20)

  1. 1 - 70 . (canceled)
  2. 71 . A method at a terminal device for selecting a cell for network access, the method comprising: receiving one or more messages and/or signals indicating one or more configurations for selecting a cell; and selecting a cell from multiple cells comprising a first cell and one or more second cells based on at least the one or more configurations, wherein at least a part of transmission associated with the one or more second cells is delegated to the first cell.
  3. 72 . The method of claim 71 , wherein the part of transmission associated with the one or more second cells is performed in the first cell instead of the one or more second cells, when the part of transmission is delegated to the first cell, and/or wherein the part of transmission associated with the one or more second cells is performed in the one or more second cells, when the part of transmission is not delegated to any cell.
  4. 73 . The method of claim 71 , wherein before the step of selecting the cell, the method further comprises: receiving, from the first cell, a paging message destined to the terminal device, and wherein the step of selecting the cell is performed in response to the step of receiving, from the first cell, a paging message destined to the terminal device.
  5. 74 . The method of claim 71 , wherein the one or more configurations comprise at least one of: a dedicated configuration that is dedicated to the terminal device and indicates towards which cell the terminal device is to initiate a random access procedure; and a broadcast configuration that is broadcast to the terminal device and indicates towards which cell a terminal device is to initiate a random access procedure.
  6. 75 . The method of claim 71 , wherein at least one of the one or more configurations indicates towards which cell the terminal device is to initiate a random access procedure by at least one of: an Information Element (IE); a bitfield; a value tag; and a specific sequence.
  7. 76 . The method of claim 71 , wherein when a dedicated configuration for cell selection and a broadcast configuration for cell selection are received by the terminal device, the broadcast configuration is overruled by the dedicated configuration.
  8. 77 . The method of claim 71 , wherein when the one or more messages indicate a dedicated configuration, the one or more messages further indicate a validity timer and/or a validity area, such that the dedicated configuration is valid for the terminal device only during a time duration indicated by the validity timer and/or only when the terminal device is located in the validity area.
  9. 78 . The method of claim 71 , wherein at least one of the one or more configurations indicates that different cells from the multiple cells are to be selected for access due to different trigger events.
  10. 79 . The method of claim 78 , wherein the trigger events comprise at least one of: paging; and terminal device initiated access.
  11. 80 . The method of claim 71 , wherein at least one of the one or more configurations indicates that different cells from the multiple cells are to be selected for access with different establishment causes.
  12. 81 . The method of claim 71 , wherein when the one or more messages comprise a paging message, the step of selecting the cell comprises: selecting different cells from the multiple cells for access in response to the paging message being encoded with different Radio Network Temporary Identifiers (RNTIs).
  13. 82 . The method of claim 71 , wherein when the one or more messages comprise a paging message, a configuration for cell selection indicated by the paging message overrides any other configuration for cell selection that is received prior to the paging message.
  14. 83 . The method of claim 71 , wherein when the one or more messages comprise a paging message, a configuration for cell selection indicated by the paging message explicitly indicates towards which cell a random access procedure is to be initiated by the terminal device, and wherein the step of selecting the cell comprises: selecting the cell indicated by the paging message.
  15. 84 . A terminal device, comprising: a processor; a memory storing instructions which, when executed by the processor, cause the processor to: receive one or more messages and/or signals indicating one or more configurations for selecting a cell; and select a cell from multiple cells comprising a first cell and one or more second cells based on at least the one or more configurations, wherein at least a part of transmission associated with the one or more second cells is delegated to the first cell.
  16. 85 . A method at a network node for facilitating a terminal device in selecting a cell for network access, the method comprising: transmitting one or more messages and/or signals indicating one or more configurations for selecting a cell to enable the terminal device to select a cell from multiple cells comprising a first cell and one or more second cells based on at least the one or more configurations; wherein at least a part of transmission associated with the one or more second cells is delegated to the first cell.
  17. 86 . The method of claim 85 , wherein the part of transmission associated with the one or more second cells is performed in the first cell instead of the one or more second cells, when the part of transmission is delegated to the first cell, and/or wherein the part of transmission associated with the one or more second cells is performed in the one or more second cells, when the part of transmission is not delegated to any cell, or when the part of transmission is delegated to the one or more second cells.
  18. 87 . The method of claim 85 , further comprising receiving, from the terminal device, a Physical Random Access Channel (PRACH) transmission for the selected cell.
  19. 88 . The method of claim 87 , wherein before the step of receiving, from the terminal device, the PRACH transmission, the method further comprises: transmitting, to the terminal device, a paging message; wherein the step of receiving, from the terminal device, the PRACH transmission is performed in response to the step of transmitting, to the terminal device, a paging message.
  20. 89 . The method of claim 85 , wherein the one or more messages and/or signals comprise at least one of: a Radio Resource Control (RRC) Master Information Block (MIB) message; an RRC System Information Block 1 (SIB1) message; an RRC System Information (SI) message; an RRC paging message; a Medium Access Control (MAC) Protocol Data Unit (PDU); a MAC CE; a paging Physical Downlink Shared Channel (PDSCH); a Physical Downlink Control Channel (PDCCH); a Synchronous Signal and Physical Broadcast Channel Block (SSB); and a Reference Signal (RS).

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims priority to the PCT International Application No. PCT/CN2022/129835, entitled “SELECTION OF CELL FOR NETWORK ACCESS IN CELL DELEGATION SCENARIO”, filed on Nov. 4, 2022, which is incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure is related to the field of telecommunication, and in particular, to a User Equipment (UE), a network node, and methods for selecting a cell for network access in a cell delegation scenario. BACKGROUND With the development of the electronic and telecommunication technologies, mobile devices, such as mobile phones, smart phones, laptops, tablets, vehicle mounted devices, become an important part of our daily lives. To support a numerous number of mobile devices, a highly efficient Radio Access Network (RAN), such as a fifth generation (5G) New Radio (NR) RAN, will be required. Carriers have been looking at energy efficiency for a few years now, but 5G will bring this to top of mind because it is going to use more energy than 4G. Some carriers spend on average 5% to 6% of their operating expenses, excluding depreciation and amortization, on energy costs, and this is expected to rise with the shift from 4G to 5G. A typical 5G base station consumes up to twice or more the power of a 4G base station, and energy costs can grow even more at higher frequencies, due to a need for more antennas and a denser layer of small cells. Edge computing facilities needed to support local processing and new internet of things (IoT) services will also add to overall network power usage. According to data on Remote Radio Unit (RRU)/Baseband Unit (BBU) needs per site, a typical 5G site has power needs of over 11.5 kilowatts, up nearly 70% from a base station deploying a mix of 2G, 3G, and 4G radios. 5G macro base stations may require several new, power-hungry components, including microwave or millimeter wave transceivers, field-programmable gate arrays (FPGAs), faster data converters, high-power/low-noise amplifiers and integrated Multiple-Input-Multiple-Output (MIMO) antennas. The increased power demands of a 5G base station can create several problems: Insufficient alternating current (AC) power supply;Insufficient battery capacity: more backup battery capacity is needed, yet traditional lead-acid batteries have low energy density and their capacities are difficult to expand;Unable to support high-power long-distance transmission: in 5G scenarios requiring high power supply to remote active antenna units (AAUs), the voltage drop means that transmission distance is limited. SUMMARY According to a first aspect of the present disclosure, a method at a terminal device for selecting a cell for network access is provided. The method comprises: receiving one or more messages and/or signals indicating one or more configurations for selecting a cell; and selecting a cell from multiple cells comprising a first cell and one or more second cells based on at least the one or more configurations, wherein at least a part of transmission associated with the one or more second cells is delegated to the first cell. In some embodiments, the multiple cells are associated with one or more network nodes. In some embodiments, the part of transmission associated with the one or more second cells is performed in the first cell instead of the one or more second cells, when the part of transmission is delegated to the first cell, and/or the part of transmission associated with the one or more second cells is performed in the one or more second cells, when the part of transmission is not delegated to any cell. In some embodiments, the method further comprises: initiating a random access procedure towards the selected cell. In some embodiments, before the step of selecting the cell, the method further comprises: receiving, from the first cell, a paging message destined to the terminal device, wherein the step of selecting the cell is performed in response to the step of receiving, from the first cell, a paging message destined to the terminal device. In some embodiments, the one or more messages and/or signals comprise at least one of: a Radio Resource Control (RRC) Master Information Block (MIB) message; an RRC System Information Block 1 (SIB1) message; an RRC System Information (SI) message; an RRC paging message; a Medium Access Control (MAC) Protocol Data Unit (PDU); a MAC Control Element (CE); a paging Physical Downlink Shared Channel (PDSCH); a Physical Downlink Control Channel (PDCCH); a Synchronous Signal and Physical Broadcast Channel Block (SSB); and a Reference Signal (RS). In some embodiments, for at least one of the second cells, at least one of following is delegated to the first cell: SSB transmission associated with the at least one second cell; SIB1 transmission associated with the at least one second cell; SI transmission associated with the at least one second cell; and paging associated with the at least one se