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    • 专利摘要:
    method and apparatus for selecting neighboring cells in a mobile communication system. a user equipment (ue) neighbor cell lookup method and apparatus are provided for performing the cell lookup procedure using a physical cell identity (pci) list of pcis used by evolved b nodes (enbs ) for a closed subscriber group (csg) that is from an enb in a long-term evolution (lte) system. the cell search method includes selecting a cell from a base station, receiving system information including the physical cell identity (pci) list used by the base station's neighboring closed subscriber group (csg) cells, determining if the terminal is in any cell selection state for any cell selection, and search, when the terminal is in any cell selection state, neighboring cells without applying the pci list. The cell searching method and apparatus are capable of performing the cell searching procedure for appropriate enbs, resulting in improved network attachment efficiency.
    公开号:BR112014008194B1
    申请号:R112014008194-8
    申请日:2012-10-04
    公开日:2022-01-04
    发明作者:Jae Hyuk Jang；Soeng Hun Kim；Kyeong In Jeong
    申请人:Samsung Electronics Co., Ltd；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to a mobile communication system. More particularly, the present invention relates to a user equipment (UE) neighbor cell lookup method and apparatus using a physical cell identity (PCI) list of PCIs used by evolved Node Bs (eNBs). ) to a Closed Subscriber Group (CSG) that is from an eNB on a long-term evolution (LTE) system. FUNDAMENTALS OF THE TECHNIQUE
    [002] With the rapid advances in technologies, mobile communication systems have evolved to the 4th generation (4G) system represented by Long Term Evolution (LTE). LTE is designed to work under the assumption of various scenarios as it becomes aware of various capabilities of the base station. For example, LTE introduced a concept of Closed Subscriber Group (CSG) where only endpoints belonging to a CSG have the right to access a corresponding CSG cell.
    [003] Figure 1 is a diagram illustrating an architecture of an LTE system according to the related technique.
    [004] Referring to Figure 1, the radio access network of the mobile communication system includes evolved Nodes B (eNBs) 105, 110, 115 and 120, a Mobility Management Entity (MME) 125, and a Gateway Serving (S-GW) 130. User Equipment (hereinafter referred to as UE) 135 connects to an external network through eNBs 105, 110, 115, and 120 and the S-GW 130.
    [005] In Figure 1, eNBs 105, 110, 115 and 120 correspond to legacy B nodes of a universal mobile communications system (UMTS). The eNBs 105, 110, 115, and 120 allow the UE to establish a radio link and are responsible for complicated functions compared to legacy B-nodes. In the LTE system, all user traffic including real-time services such as Voice over Internet Protocol (VoIP), is provided over a shared channel and therefore there is a need for a device that is located on the eNB to program data. based on state information such as UE buffer conditions, power free space state, and channel state. Typically, an eNB controls a plurality of cells. In order to guarantee a data rate of up to 100 Mbps, the LTE system adopts Orthogonal Frequency Division Multiplexing (OFDM) as a radio access technology. Furthermore, the LTE system adopts Adaptive Modulation and Coding (AMC) to determine the modulation scheme and channel coding rate in adaptation to the UE channel condition. The S-GW 130 is an entity to provide data carriers in order to establish and release data carriers under the control of the MME 125. The MME 125 is responsible for various control functions and is linked to a plurality of eNBs 105, 110, 115, and 120.
    [006] Figure 2 is a diagram illustrating an LTE system protocol stack according to the related technique.
    [007] Referring to Figure 2, the LTE system protocol stack includes Packet Data Convergence Protocol (PDCP) 205 and 240, Radio Link Control (RLC) 210 and 235, Medium Access Control ( MAC) 215 and 230, and Physical (PHY) 220 and 225. The PDCP 205 and 240 is responsible for IP header compression/decompression, and the RLC 210 and 235 is responsible for segmenting the PDCP Protocol Data Unit (PDU) into appropriately sized segments for Auto-Repeat Request (ARQ) operation. MAC 215 and 230 are responsible for establishing connection to a plurality of RLC entities in order to multiplex RLC PDUs into MAC PDUs and demultiplex MAC PDUs into RLC PDUs. The PHY 220 and 225 perform channel coding on the MAC PDU and modulate the MAC PDU into OFDM symbols to transmit over the radio channel or perform channel demodulation and decoding of the received OFDM symbols and deliver the decoded data to the upper layer. In addition, the PHY layer uses hybrid ARQ (HARQ) for additional error correction by transmitting 1 bit of information indicating positive or negative acknowledgment from the receiver to the transmitter. This is referred to as ACK / NACK HARQ information. Downlink ACK/NACK HARQ information corresponding to an uplink transmission is transmitted via physical Hybrid ARQ Indicator Channel (PHICH), and uplink ACK/NACK HARQ information corresponding to a downlink transmission can be transmitted through the Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH).
    [008] A UE can be in one of two states: a connected mode and an idle mode.
    [009] Meanwhile, an eNB can be categorized into one of the following types: an acceptable cell, a suitable cell, a barred cell, and a reserved cell. An acceptable cell corresponds to a cell allowing limited services (emergency call and ETWS), and a cell not barred and satisfying cell selection conditions. A suitable cell corresponds to a cell providing UE with normal service, a cell that is part of the selected/registered Public Land Mobile Network (PLMN) or PLMN from the equivalent PLMN list, for a cell of CSG, CSG ID transmitted by the cell is present in whitelist CSG, and an unbarred cell and satisfying cell selection conditions. A barred cell corresponds to a cell indicated as barred cell in system information. A reserved cell corresponds to a cell indicated as a reserved cell in system information.
    [010] The UE in idle mode can be in one of several states according to the type of cell it searches for or camps on. For example, when the UE is in idle mode, the UE can be in a normally camped state, a cell selection on exiting RRC_Connected state, an any cell selection state, and a camped across state of camped on any cell.
    [011] The camped state normally corresponds to a state where a suitable cell is found through the cell selection/reselection procedure. In this state, the UE monitors the paging channel to determine if there is new data to be received from the network and receives system information. The UE also performs measurement for cell reselection and performs a cell reselection procedure.
    [012] Cell Selection when leaving RRC Connected state corresponds to a state where the UE tries to look for a suitable cell when it transitions from an RRC_CONNECTED state to the RRC_IDLE state.
    [013] The selection state of any cell corresponds to a state where the UE tries to find an acceptable cell from any PLMN when it does not find a "suitable cell" or is rejected by the selected PLMN, the UE tries to find an acceptable cell from any PLMN in this state When an acceptable cell is found, the UE transitions to the "state camped in any cell".
    [014] The camped state in any cell corresponds to a state in which the UE monitors paging channel to determine if there is new data to be received from the network and receives system information. The UE also performs measurement for cell reselection and performs cell reselection procedure according to conditions. The UE also performs cell-to-adjacent suitable cell polling.
    [015] UE in idle mode receives system information transmitted by eNB to acquire information about neighboring eNBs. The eNB (hereinafter, interchangeably used with the term "macro eNB") notifies the UEs of the Physical Cell Identifier (PCI) list used by CSG eNBs via System Information Block (SIB) 4. The PCI list is notified via the csg-PhysCellIdRange parameter, and once the csg-PhysCellIdRange is received, the UE camped in a PLMN cell assumes the PCI list is the value for 24 hours. CSG for this period, cells using the corresponding PCI are discarded in the cell selection/reselection procedure. DISCLOSURE OF THE INVENTION TECHNICAL PROBLEM
    [016] However, the method according to the related technique has a disadvantage in that the PCI used by the CSG eNBs is always excluded in the cell lookup (selection/reselection) so as to disturb efficient cell lookup of the UE.
    [017] Therefore, there is a need for a method and apparatus of a UE that is capable of facilitating the cell lookup process based on the PCI list used by CSG cells in adaptation to the UE state.
    [018] The above information is presented as background information only to assist in understanding this disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art with respect to the present invention. TROUBLESHOOTING
    [019] Aspects of the present invention are to address at least the aforementioned problems and/or disadvantages and provide at least the advantages described below. Therefore, an aspect of the present invention is to provide a User Equipment (UE) cell search method and apparatus that is capable of facilitating cell search procedure based on the Physical Cell Identifier (PCI) list used. by the Closed Subscriber Group (CSG) cells in adaptation to the UE state.
    [020] Another aspect of the present invention is to provide a method for using the PCI list of CSG cells that is transmitted by an evolved node B (ENB) as follows.
    [021] Contrary to the normal situation in which the cell reselection procedure is performed with the PCI list information used by the CSG cells, if it is in the selection state of any cell (for example, state allowing only the service of emergency), the UE performs the cell reselection procedure for all cells including the CSG cells indicated by the PCI list information (abort or removal).
    [022] The UE determines whether the Primary Public Land Mobile Network (PLMN) is changed and, if so, includes the cells included in the PCI list information used by the CSG cells (cancellation or removal) in the cell re-selection procedure . On the other hand, if the primary PLMN is not changed, the UE performs the cell reselection procedure applying the PCI list used by the CSG cells.
    [023] When the primary PLMN is changed, if new information from the PCI list used by the CSG cells is received in the cell, the cell reselection is performed with the application of the corresponding application.
    [024] According to an aspect of the present invention, a method of searching a cell of a terminal in a mobile communication system is provided. The cell lookup method includes selecting a cell from a base station, receiving system information including a Physical Cell Identity (PCI) list used by Closed Subscriber Group (CSG) cells neighboring the base station, determining whether the terminal is in any cell selection state for any cell selection, and fetch, when the terminal is in any cell selection state, neighboring cells without PCI list application.
    [025] According to another aspect of the present invention, a terminal for searching neighboring cells in a mobile communication system is provided. The terminal includes a transceiver for transmitting and receiving signals to and from a base station, and a controller for selecting a cell from a base station, receiving system information including a Physical Cell Identity (PCI) list used by Cell Group cells. Closed Subscriber (CSG) neighbors of the base station, determine if the terminal is in a select state of any cell to select any cell, and search, when the terminal is in select state of any cell, neighboring cells without applying the list of PCI.
    [026] According to another aspect of the present invention, a method of polling a cell neighbor of a terminal in a mobile communication system is provided. The neighbor cell polling method includes selecting a cell from a first base station, determining, when first system information is received, whether a network operator changes, and polling, when the network operator changes, neighboring cells with no application. of Physical Cell Identity (PCI) list received from a base station other than the first base station.
    [027] In accordance with yet another aspect of the present invention, a terminal for searching neighboring cells in a mobile communication system is provided. The terminal includes a transceiver for transmitting and receiving signals to and from a base station, and a controller for selecting a cell from a first base station, determining, when first system information is received, whether a network operator is changed, and searching, when the network operator is changed, neighboring cells without Physical Cell Identity (PCI) list application received from another base station than the first base station.
    [028] Other important aspects, advantages and features of the invention will be apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the accompanying drawings, describes exemplary embodiments of the invention. ADVANTAGEOUS EFFECTS OF THE INVENTION
    [029] The cell polling method and apparatus of exemplary embodiments of the present invention are capable of performing the cell polling procedure for appropriate eNBs, resulting in improved network attachment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
    [030] The foregoing and other aspects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: Figure 1 is a diagram illustrating an architecture of a system Long Term Evolution (LTE) according to the related technique; Figure 2 is a diagram illustrating a protocol stack of an LTE system according to the related art; Figure 3 is a signaling diagram illustrating a Physical Cell Identity (PCI) list-assisted cell lookup procedure of a user equipment (UE), in accordance with an exemplary embodiment of the present invention; Figure 4 is a flowchart illustrating a PCI list-assisted cell lookup procedure of a UE in accordance with a first exemplary embodiment of the present invention; Figure 5 is a signaling diagram illustrating a PCI list-assisted cell lookup procedure of a UE in accordance with a second exemplary embodiment of the present invention; Figure 6 is a flowchart illustrating a PCI list-assisted cell lookup procedure of a UE in accordance with a second exemplary embodiment of the present invention; Figure 7 is a signaling diagram illustrating a PCI list-assisted cell lookup procedure of a UE in accordance with a third exemplary embodiment of the present invention; Figure 8 is a flowchart illustrating a PCI list assisted cell lookup procedure of a UE procedure in accordance with the third exemplary embodiment of the present invention; Figure 9 is a block diagram illustrating a configuration of a UE according to an exemplary embodiment of the present invention; and Figure 10 is a block diagram illustrating an evolved Node B (ENB) configuration in accordance with an exemplary embodiment of the present invention.
    [031] Throughout the drawings, it should be noted that similar reference numbers are used to describe the same or similar elements, features and structures. MODE FOR THE INVENTION
    [032] The following description with reference to the accompanying drawings is provided to aid in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes several specific details to aid in this understanding, but these are to be regarded as illustrative only. Thus, those of ordinary skill in the art will recognize that various changes and modifications to the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of known functions and constructions may be omitted for clarity and brevity.
    [033] The terms and words used in the following description and claims are not limited to bibliographic meanings, but are used only by the inventor to allow a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for illustrative purposes only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
    [034] It should be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly indicates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more such surfaces.
    [035] As noted above, only User Equipment (UEs) that are members of a Closed Subscriber Group (CSG) are allowed to access a CSG cells, and therefore there is a need for a non-CSG member UE to delete the cells from the CSG. CSG in the cell selection procedure. In the current Long Term Evolution (LTE) standard, a Physical Cell Identity (PCI) list for CSG cells is transmitted from an evolved micronode B (eNB) to the UE such that the UE polls for neighboring cells with the exception of CSG cells using PCI.
    [036] However, the PCI list used by the CSG cells may change as the supplier policy changes or there may be a special situation that requires retry for the CSG cell (e.g. there is no cell for the UE being able to access). However, current technology does not provide any method to deal with this situation and thus there is a need for a method to overcome this problem.
    [037] Figure 3 is a signaling diagram illustrating a UE PCI list assisted cell lookup procedure in accordance with an exemplary embodiment of the present invention. In order to help understand exemplary embodiments of the present invention, it is assumed that the UE 301 has completed cell selection/reselection for the eNB 303.
    [038] Referring to Figure 3, UE 301 in idle mode completes cell selection/reselection for eNB 303 in step 311. After that, UE 301 receives System Information Block (SIB) 4 from from eNB 303 and extracts PCI list used by neighboring CSG cell from SIB 4 in step 313. PCI list used by neighboring CSG cells is included in csg-PhysCellIdRange field.
    [039] If the csg-PhysCellIdRange field is received, then the UE 301 starts a timer set for a first period of time (e.g., 24 hours) in step 315. While the timer operates, the UE 301 considers the list of PCI used by neighboring CSG cells that were received from eNB 303 is valid. In the case where it measures neighboring cells for neighbor cell selection/reselection, the UE performs measurement for cells that are not included in the PCI list used by neighboring CSG cells in step 321.
    [040] This operation does not cause a problem in normal situations, (ie when there is a cell from which normal service can be received). For example, in a case where there is a suitable cell among the cells with the exception of the cells included in the csg-PhysCellIdRange, the UE 301 is able to camp in the corresponding cell to receive normal service.
    [041] However, if there is no suitable cell among the cells with the exception of cells included in the csg-PhysCellIdRange, then the cell included in the previously received csg-PhysCellIdRange may be a macrocell rather than a CSG cell and is preferable that even the emergency call is served by the cell having the best radio channel condition (although it is a CSG cell).
    [042] Therefore, when the UE 301 is in a select state of any cell (hereinafter, interchangeably used with the term "first state") such as the state described above (e.g., when there is no suitable adjacent cell) , the UE determines that the csg-PhysCellIdRange information included in the PCI list is invalid and therefore measures neighboring cells by including the cells in the csg-PhysCellIdRange to perform cell selection/reselection in step 323. For example, the UE 301 measures the neighboring cells that are not indicated in the PCI list in the above case.
    [043] If timer 315 has expired in step 317, then UE 301 determines that the previously received csg-PhysCellIdRange information is no longer valid and measures all neighboring cells including the CSG cells indicated in csg-PhysCellIdRange to perform the selection / cell reselection in step 325.
    [044] Figure 4 is a flowchart illustrating a PCI list assisted cell lookup procedure of a UE in accordance with a first exemplary embodiment of the present invention.
    [045] Referring to Figure 4, UE 301 receives a physical Cell ID range information for use in CSG cells (i.e. PCI list in SIB4 from eNB 303 (e.g. macro eNB) ) in step 401. Upon receipt of the PCI list, the UE 301 starts the timer having a length of the first time duration (e.g., 24 hours) in step 403.
    [046] In step 405, the UE 301 determines whether the timer has expired. If the time is determined to have expired, then the UE 301 proceeds to step 407. In contrast, if the timer is determined not to have expired, then the UE 301 proceeds to step 409.
    [047] In step 409, the UE 301 determines whether the UE 301 is in any cell selection state.
    [048] Afterwards, if the timer is running in the cell selection/reselection procedure and if the UE is not in any cell selection state where there is no adjacent suitable cell, then the UE 301 considers the information received in step 401 as valid and uses this information in the neighboring cell selection/reselection procedure in step 411. For example, if it does not belong to any CSG cell, then UE 301 performs cell selection/reselection procedure with the exception of the CSG cells indicated in the PCI list.
    [049] However, if the time has expired or if the UE is in the select state of any cell having no suitable cells around although the timer has not expired, then the UE 301 considers the information received in step 401 as invalid and therefore excludes the physical cell ID range (i.e. the PCI list) in the cell selection/reselection procedure. In other words, the UE 301 measures neighboring cells without regard to the PCI list.
    [050] Figure 5 is a signaling diagram illustrating a PCI list assisted cell lookup procedure of a UE in accordance with a second exemplary embodiment of the present invention. In order to help understand an exemplary embodiment of the present invention, it is assumed that the UE is not a member of any CSG.
    [051] Referring to Figure 5, UE 501 in idle mode completes cell selection/reselection for eNB A 503 in step 511. Once the cell selection/reselection procedure has been completed, UE 501 receives a SIB 1 message from eNB A 503 to acquire Public Land Mobile Network (PLMN) information from eNB A 503 in step 513. UE 501 compares received PLMN information with primary PLMN information from eNB to determine whether the PLMN is changed in step 515.
    [052] Upon receipt of SIB 4 which includes csg-PhysCellIdRange information in step 517, if the PLMN is not changed, then UE 501 starts a timer set for a first period of time (e.g. 24 hours) in step 519 Information from SIB 4 can be received from the other eNB that UE 501 has attached to than eNB A 503, and if the primary PLMN has not changed, then the timer on or reset on reception of SIB 4 is kept with the validity of csg-PhysCellIdRange information in step 521.
    [053] Thereafter, the UE performs 501 cell reselection for the eNB B 505 according to the roaming or change of radio channel condition in step 531. The UE receives 501 message from SIB 1 from of the newly selected eNB B 505 to acquire the PLMN information from eNB B 505 in step 533.
    [054] The UE 501 then compares the received PLMN information with the primary PLMN of the old eNB to determine if the PLMN is changed in step 535. If the PLMN is changed, then the UE 501 measures the neighboring cell in step 537 without regard to the csg-PhysCellIdRange received in step 517. For example, UE 501 performs neighbor cell measurement without applying the PCI list. However, if the csg-PhysCellIdRange is acquired from the SIB 4 received from the eNB B 505 in step 539, then the UE 501 performs measurement for cell selection/reselection in consideration of the csg-PhysCellIdRange just received in step 543. For example, UE 501 excludes the CSG cells indicated in the csg-PhysCellIdRange (or PCI list) in the measurement. The csg-PhysCellIdRange received in step 517 and the csg-PhysCellIdRange received in step 539 may be identical or different from each other. Upon receipt of the SIB 4 that includes csg-PhysCellIdRange information at step 539, the UE 501 starts a timer set for a first period of time (e.g., 24 hours) at step 541.
    [055] Figure 6 is a flowchart illustrating a PCI list-assisted cell lookup procedure of a UE in accordance with a second exemplary embodiment of the present invention.
    [056] Referring to Figure 6, UE completes cell selection/reselection for a new cell in step 601. Once cell selection/reselection for a new cell has completed in step 601, UE 501 receives information of PLMN in SIB1 transmitted by the re-selected / newly selected cell (eg eNB). Then the UE 501 determines whether the PLMNs of the old cell (e.g. previously selected/reselected) and the new cell match each other in step 603.
    [057] If the PLMNs are determined not to match each other, the UE 501 determines whether the Physical Cell ID range information previously received from another CSG cell exists in step 605. If the ID range information previously stored Physical Cell ID is determined to exist, the UE discards that information in step 607. On the other hand, if the Physical Cell ID range information previously received from another CSG cell is determined not to exist in step 605 , then the process goes to step 609. Likewise, if the PLMNs match each other in step 603, the process goes to step 609.
    [058] In step 609, UE 501 determines whether new Physical Cell ID range information in CSG cells is received in SIB4 transmitted by the re-selected/newly-selected cell. If Physical Cell ID range information is determined to have been received at step 609, the UE 501 uses the corresponding information in the cell selection/reselection procedure at step 611.
    [059] In contrast, if no new Physical Cell ID range information is determined to have been received in step 609, the UE 501 determines whether Physical Cell ID range information from the old CSG cell is received in step 613. If the Physical Cell ID range information of the old CSG cell is determined to have been received in step 613, the UE 501 performs the cell selection/reselection procedure with the old Physical Cell ID range information in step 615. In contrast, if the Physical Cell ID range information of the old CSG cell is determined not to have been received in step 613, then UE 501 performs cell selection/reselection procedure for all cells in step 617.
    [060] Figure 7 is a signaling diagram illustrating a PCI list assisted cell lookup procedure of a UE in accordance with a third exemplary embodiment of the present invention. In order to help understand the third exemplary embodiment of the present invention, it is assumed that the UE is not a member of any CSG.
    [061] Referring to Figure 7, UE 701 in idle mode completes cell selection/reselection for eNB 703 in step 711.
    [062] After completing cell selection/reselection, UE 701 receives a message from SIB1 from eNB 703 to acquire PLMN information in step 713.
    [063] The UE 701 compares the received PLMN information and the primary PLMN information from the old eNB to determine if the PLMN is changed in step 715.
    [064] If the PLMN is changed, UE 701 measures neighboring cells without regard to the csg-PhysCellIdRange information received from the old cell in step 717. For example, UE 701 performs neighbor cell measurement without applying the PCI list . However, if csg-PhysCellIdRange is received in SIB4 from eNB 703 after step 719, UE 701 performs measurement for cell selection/reselection in consideration of csg-PhysCellIdRange just received in step 723. For example, UE 701 excludes the CSG cells indicated by the csg- PhysCellIdRange in the measurement.
    [065] If the csg-PhysCellIdRange is received, the UE 701 starts a timer having a length of the first time period (e.g., 24 hours) at step 721. Until the timer expires at step 727, the PCI list used by the neighboring cells CSG is valid. Thus, when measuring neighboring cells for cell selection/reselection, UE 701 performs measurement for cells that are not included in the PCI list in step 723.
    [066] This operation does not cause a problem when there is a cell providing normal service. For example, if there is a suitable cell among the cells that are not indicated by the csg-PhysCellIdRange, the UE 701 camps in the corresponding cells to receive normal service.
    [067] However, the cell indicated by the csg-PhysCellIdRange that was received earlier in the situation where there is no suitable cell among the cells that are not indicated by the csg-PhysCellIdRange may be a normal macrocell and it is preferred that even the call from emergency is served by the cell having the best radio channel condition (although it is a CSG cell).
    [068] Also, in step 725, UE 701 performs a measurement for cell selection/reselection when the UE is in any cell selection state.
    [069] Therefore, when the UE is in the select state of any cell as described above (e.g. when there is no adjacent suitable cell), the UE 701 determines the null of the csg-PhysCellIdRange and performs measurement for the neighboring cells including the cells indicated by csg-PhysCellIdRange for cell selection/reselection in step 729.
    [070] Figure 8 is a flowchart illustrating a PCI list assisted cell lookup procedure of a UE procedure in accordance with a third exemplary embodiment of the present invention.
    [071] Referring to Figure 8, UE completes cell selection/reselection in step 801. After selecting/reselecting a new cell in step 801, UE receives PLMN information in SIB1 transmitted by the re-selected/newly selected cell and determines whether the received PLMN information is identical to the old cell's primary PLMN in step 803.
    [072] If the PLMNs are determined not to match each other, the UE determines whether the physical cell ID range information of CSG cells that was previously received from another cell exists in step 805. Physical cell ID is determined to exist, the UE discards this physical cell ID range information in step 807.
    [073] In contrast, if the UE determines that the physical cell ID range information of CSG cells that was previously received from other cells does not exist in step 805, then the process passes to step 809. Otherwise, if the PLMNs are determined to match each other in step 803, the process moves to step 809.
    [074] The UE determines whether the physical cell ID range information used in the CSG cells is newly received in SIB4 from the re-selected / newly selected cell in step 809. If the UE determines that the cell ID range information physical cell used in the CSG cells is just received in SIB4 from the re-selected/newly selected cell in step 809, then the UE starts a timer having the length of the first time period (e.g. 24 hours) in step 811.
    [075] The UE determines whether the timer has expired in step 813. If the time is determined not to have expired, the UE determines whether the UE is in a state capable of receiving emergency call service (for example, the state of select any cell) in step 815. If the UE is determined not to be in the select any cell state where there is no suitable adjacent cell, the UE considers the physical cell ID range information used in the cells of CSG is valid in step 817. The UE then performs cell selection/reselection by referencing the physical cell ID range information just received later in step 819. For example, the CSG cells included in the received PCI list are discarded in the measurement.
    [076] However, if the timer is determined to have expired in step 813, if the timer has not expired, but the UE is determined to be in the select state of any cell where there is no suitable adjacent cell in step 815, the UE considers in step 821 that the information received in step 809 is invalid. Thus, the UE performs cell selection/reselection for all cells without regard to the physical cell ID range in step 823.
    [077] If the UE determines that no new physical cell ID range information from CSG cells is received in SIB4 in step 809, the UE determines whether old physical cell ID range information from CSG cells is received in step 825. If the old physical cell ID range information is determined to have been received in step 825, the UE performs cell selection/reselection procedure with the old Physical Cell ID range information in step 827. In contrast, if the old physical cell ID range information is determined not to have been received in step 825, it performs the cell selection/reselection procedure to all cells in step 823.
    [078] Figure 9 is a block diagram illustrating a configuration of a UE in accordance with an exemplary embodiment of the present invention.
    [079] Referring to Figure 9, the UE according to an exemplary embodiment of the present invention includes a transceiver 905, a controller 910, a multiplexer/demultiplexer 920, upper layer processors 925 and 930, and a message processor control 935.
    [080] Transceiver 905 receives data and control signals over a downlink channel from the serving cell and transmits data and control signals over an uplink channel. If multiple serving cells are configured, transceiver 905 is capable of transmitting and receiving data and control signals across multiple serving cells.
    [081] The multiplexer/demultiplexer 920 multiplexes the data generated by the upper layer processor 925 and 930 and the control message processor 935, and demultiplex the data received by the transceiver 905 to deliver the demultiplexed data to appropriate processors (e.g., the upper layer processors 925 and 930 and control message processor 935).
    [082] Control message processor 935 processes the control message received from the eNB to take appropriate action. For example, if XRD related parameters are received, the 935 control message processor provides these parameters to the 910 controller.
    [083] Upper layer 925 or 930 processors are configured per service to process data generated by a user service such as File Transfer Protocol (FTP) and Voice over Internet Protocol (VoIP) and transfer the processed data to the multiplexer/demultiplexer 920 and process the data from the multiplexer/demultiplexer 920 and deliver the processed data to the service application running on the upper layer.
    [084] Controller 910 parses the schedule command (e.g., uplink guarantee) received by transceiver 905, and controls transceiver 905 and multiplexer/demultiplexer 920 to perform uplink transmission with appropriate transmission capability at the time adequate. Controller 910 controls transceiver 905 by becoming aware of DRX operation and CSI/SRS transmission.
    [085] According to an exemplary embodiment of the present invention, the controller 910 is capable of performing cell selection for a given eNB. The controller controls receipt of system information including physical cell identity (PCI) used by the adjacent Closed Subscriber Group (CSG) from the eNB. Controller 910 determines whether the UE is in an any cell select state and, if so, controls neighbor cell polling without applying the received PCI list. In this case, if the UE performs neighbor cell lookup without applying the received PCI list, then the neighbor cell lookup is performed for all cells including the CSG cells included in the PCI list.
    [086] If the UE is not in any cell selection state, controller 910 controls the neighbor cell lookup with application of the received PCI list. In this case, if the UE performs a neighbor cell lookup with application of the received PCI list, this means that the neighbor cell lookup is performed for cells with the exception of the CSG cells included in the PCI list.
    [087] Controller 910 is also capable of starting a timer having the length of the first time duration after receiving the system information and controlling the neighbor cell lookup with PCI list application before the timer expires.
    [088] In accordance with another exemplary embodiment of the present invention, controller 910 is capable of performing cell polling for a given first eNB. If the first system information is received from the first eNB, controller 910 determines whether the PLMN is changed and, if so, controls the neighbor cell lookup with no application of the physical cell identity list (PCI) received from it. of the first eNB and other eNBs.
    [089] If the second system information including the PCI list used by the Closed Subscriber Group (CSG) cells that are transmitted by the first eNB is received, controller 910 is able to perform neighbor cell lookup with application of the list of PCI included in the second system information.
    [090] Figure 10 is a block diagram illustrating a configuration of an eNB in accordance with an exemplary embodiment of the present invention.
    [091] Referring to Figure 10, the eNB includes a transceiver 1005, a controller 1010, a programmer 1015, a multiplexer/demultiplexer 1020, various upper layer processors 1025 and 1030, and a control message processor 1035.
    [092] Transceiver 1005 transmits data and control signals on a downlink carrier and receives data and control signals on an uplink carrier. If multiple carriers are configured, the transceiver 1005 transmits and receives data and control signals over the multiple carriers.
    [093] The multiplexers/demultiplexers 1020 multiplex the data generated by the upper layer processors 1025 and 1030 and the control message processor 1035, and demultiplex the data received by the transceiver 1005 to deliver the demultiplexed data to at least one of the layer processors. 1025 and 1030, the control message processor 1035, and the controller 1010. The control message processor 1035 processes the message transmitted by the UE and takes a necessary action or generates a control message to be transmitted to the UE for the top layer.
    [094] Upper layer processors 1025 or 1030 are configured per UE per service to process data generated by a user service such as File Transfer Protocol (FTP) and Voice over Internet Protocol (VoIP), to transfer the processed data to the multiplexer/demultiplexer 1020, to process the data from the multiplexer/demultiplexer 1020, and to deliver the processed data to the service application running on the upper layer.
    [095] Controller 1010 controls the transceiver by becoming aware of the UE's CSI/SRS transmission timing.
    [096] The scheduler 1015 allocates transmission resources to the UE at an appropriate time in consideration of the UE's buffer state, channel state, and the UE's active time, and controls the transceiver to process the signals transmitted by the UE or to be transmitted to the EU.
    [097] As described above, the cell polling method and apparatus of exemplary embodiments of the present invention are capable of performing the cell polling procedure for appropriate eNBs, resulting in improved network attachment efficiency.
    [098] While the invention has been shown and described with reference to certain exemplary embodiments thereof, it should be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
    权利要求:
    Claims (10)
    [0001]
    1. Cell polling method of a terminal in a mobile communication system, the cell polling method characterized in that it comprises: selecting a cell from a base station; receiving, from the base station, system information including a Physical Cell Identity (PCI) list reserved for Closed Subscriber Group (CSG) cells; starting a timer based on system information; determine if the terminal is in an any cell select state to select any cell; and searching, when the terminal is in the select state of any cell and the timer is running, neighboring cells including the CSG cells without PCI list application.
    [0002]
    2. Cell search method, according to claim 1, characterized in that it further comprises: searching, when the terminal is not in the selection state of any cell, neighboring cells with application of the PCI list.
    [0003]
    3. Cell search method, according to claim 2, characterized by the fact that the search of neighboring cells with application of the PCI list comprises searching the neighboring cells with the exception of CSG cells belonging to the PCI list.
    [0004]
    4. Cell lookup method, according to claim 1, characterized in that the PCI list is included in a csg-PhysCellIdRange parameter of the system information.
    [0005]
    5. Terminal for polling neighboring cells in a mobile communication system, the terminal characterized in that it comprises: a transceiver for transmitting and receiving signals to and from a base station; and a controller configured to: select a cell from a base station, receive from the base station through the transceiver, system information including a Physical Cell Identity (PCI) list reserved for Closed Subscriber Group (CSG) cells, initiate a timer based on system information; determine if the terminal is in any cell select state to select any cell, and search, when the terminal is in any cell select state and the timer is running, neighboring cells including the CSG cells without applying the list of PCI.
    [0006]
    6. Terminal, according to claim 5, characterized in that the controller is configured to search, when the terminal is not in the selection state of any cell, the neighboring cells with application of the PCI list.
    [0007]
    7. Terminal, according to claim 6, characterized in that the neighboring cells, when the PCI list is applied, comprise cells with the exception of CSG cells belonging to the PCI list.
    [0008]
    8. Terminal, according to claim 5, characterized in that the PCI list is included in a csg-PhysCellIdRange parameter of the system information.
    [0009]
    9. Cell neighbor search method of a terminal in a mobile communication system, the cell neighbor search method characterized in that it comprises: selecting a cell of a base station, receiving, from the base station, first system information including public land mobile network (PLMN) information; receiving, from the base station, second system information including a physical cell identity (PCI) list reserved for closed subscriber group (CSG) cells; starting a timer based on the second system information; determining whether a network operator is changed based on PLMN information; and searching, when the network operator is changed and the timer is running, neighboring cells including the CSG cells without PCI list application.
    [0010]
    10. Terminal for polling neighboring cells in a mobile communication system, the terminal characterized in that it comprises: a transceiver for transmitting and receiving signals to and from a base station; and a controller configured to: select a cell of a base station, receive, from the base station through the transceiver, first system information including public land mobile network (PLMN) information, receive, from the base station through the transceiver, second information from system including a physical cell identity (PCI) list reserved for closed subscriber group (CSG) cells, start a timer based on second system information, determine if a network operator is changed based on PLMN information, and searching, when the network operator is changed and the timer is running, neighboring cells including the CSG cells without PCI list application.
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    同族专利:
    公开号 | 公开日
    US20130089029A1|2013-04-11|
    EP2764731A1|2014-08-13|
    KR20130037176A|2013-04-15|
    EP2764731A4|2016-01-27|
    US10057841B2|2018-08-21|
    WO2013051853A1|2013-04-11|
    EP3277024A1|2018-01-31|
    RU2625563C2|2017-07-14|
    CA2850750A1|2013-04-11|
    ES2751740T3|2020-04-01|
    US9420509B2|2016-08-16|
    CN103858489A|2014-06-11|
    RU2014113396A|2015-10-10|
    CN112333781A|2021-02-05|
    AU2012319335A1|2014-03-13|
    EP2764731B1|2017-09-06|
    CA2850750C|2020-12-15|
    KR101919815B1|2018-11-19|
    US20160066229A1|2016-03-03|
    BR112014008194A2|2017-04-11|
    US20160353365A1|2016-12-01|
    AU2012319335B2|2016-09-29|
    EP3277024B1|2019-09-25|
    US9185638B2|2015-11-10|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-12-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-04| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 04/10/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
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    US201161543475P| true| 2011-10-05|2011-10-05|
    US61/543,475|2011-10-05|
    US201161545363P| true| 2011-10-10|2011-10-10|
    US61/545,363|2011-10-10|
    PCT/KR2012/008033|WO2013051853A1|2011-10-05|2012-10-04|Method and apparatus for selecting neighbor cells in mobile communication system|
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