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WO2015109523A1 - 小区选择方法、装置和通信系统 - Google Patents

小区选择方法、装置和通信系统 Download PDF

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Publication number
WO2015109523A1
WO2015109523A1 PCT/CN2014/071361 CN2014071361W WO2015109523A1 WO 2015109523 A1 WO2015109523 A1 WO 2015109523A1 CN 2014071361 W CN2014071361 W CN 2014071361W WO 2015109523 A1 WO2015109523 A1 WO 2015109523A1
Authority
WO
WIPO (PCT)
Prior art keywords
cell
access
user equipment
indication information
base station
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.)
Ceased
Application number
PCT/CN2014/071361
Other languages
English (en)
French (fr)
Inventor
张磊
汪巍崴
周华
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP2016547180A priority Critical patent/JP2017504268A/ja
Priority to CN201480071193.8A priority patent/CN105850185A/zh
Priority to PCT/CN2014/071361 priority patent/WO2015109523A1/zh
Publication of WO2015109523A1 publication Critical patent/WO2015109523A1/zh
Priority to US15/216,885 priority patent/US20160330679A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/20Selecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery

Definitions

  • the present invention relates to the field of communications, and in particular, to a cell selection method, apparatus, and communication system. Background technique
  • SE Spectrum Efficiency
  • macro cells In the first four generations of mobile communications, mainly macro cells (Macro cells).
  • macro cells In the future mobile communication, in order to ensure coverage and reasonable adjustment of service requirements and equipment overhead, heterogeneous deployment of macro cells and small cells coexist, the macro cell is responsible for user coverage, and the small cell Responsible for user data offloading will become one of the main deployment scenarios for mobile communication systems.
  • Typical small cells include micro cells, Pico Cells, and Femto cells.
  • the macro cell base station has a relatively large transmission power.
  • the Power Amplifier (PA) and the Radio Frequency (F) of the macro cell base station also consume a large amount of power.
  • some air conditioning devices need to be configured. Therefore, the EE of the macro cell base station is significantly lower than that of the small cell. Small cells have obvious advantages in terms of energy saving and flexible deployment.
  • the number of users served by each macro cell is large, so the total number of users and the total uplink and downlink services of the entire cell tend to be stable.
  • the coverage area of the small cell is small, and the number of users simultaneously served by each small cell is much smaller than the number of users of the macro cell.
  • the smaller coverage area also allows the mobile subscriber to stay in a small cell for a shorter period of time, even if the user moves at a slower speed. . For example, assuming a small cell diameter of 50 m and a user's moving speed of 3 km/h (walking speed), the duration of the user's coverage in the small cell is only 60 seconds.
  • the dynamic change of users in a small cell (the user joins a small cell or leaves a small cell) is also very fast.
  • the number of users serving the small cell is small, any user starting a new service or ending an existing service may change the uplink and downlink data requirements of the entire small cell.
  • This relatively fast dynamic transformation of small cells may result in an uneven distribution of the number of users and data requirements among the small cells. For example, when a small cell is running at full load, adjacent small cells may be in a low load or even idle state.
  • Embodiments of the present invention provide a method, a device, and a communication system for cell selection to accelerate user selection of a suitable cell.
  • a cell selection method includes: a base station of a cell sends indication information to a user equipment, where the indication information indicates whether the cell is used only Accessed cell.
  • a cell selection method includes: receiving, by a user equipment, indication information sent by a base station of a cell;
  • the user equipment determines, according to the indication information, whether the cell is a cell that can only be used for access.
  • a cell selection apparatus includes: a sending unit that sends indication information to a user equipment, where the indication information indicates that a base station where the apparatus is located is covered Whether the cell is a cell that can only be used for access.
  • a cell selection apparatus includes: a receiving unit that receives indication information sent by a base station of a cell;
  • a determining unit configured to determine, according to the indication information, whether the cell is a cell that can only be used for access.
  • a base station is provided, wherein the base station includes the cell selection apparatus according to the foregoing third aspect.
  • a user equipment is provided, where the user equipment includes the cell selection apparatus according to the foregoing fourth aspect.
  • a communication system includes a base station and a user equipment, where
  • the base station is configured to send indication information to the user equipment, where the indication information indicates that the base station is covered Whether the cell is a cell that can only be used for access;
  • the user equipment is configured to receive the indication information, and determine, according to the indication information, whether the cell is a cell that can only be used for access.
  • a computer readable program wherein when the program is executed in a base station, the program causes a computer to perform the cell selection method according to the aforementioned first aspect in the base station .
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the cell selection method of the first aspect described above in a base station.
  • a computer readable program is provided, wherein when the program is executed in a user equipment, the program causes a computer to perform the cell of the foregoing second aspect in the user equipment Method of choosing.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the cell selection method of the aforementioned second aspect in a user equipment.
  • the beneficial effects of the embodiments of the present invention are as follows:
  • the cell selection method, device, and communication system according to the embodiments of the present invention can save energy and reduce interference between cells when cells are densely distributed.
  • FIG. 1 is a flowchart of an embodiment of a cell selection method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of an embodiment of a cell selection apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of another embodiment of a cell selection method according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another embodiment of a cell selection apparatus according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a composition of an embodiment of a user equipment according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a topology structure of a communication system according to an embodiment of the present invention. detailed description
  • a method of dynamically switching small cells is introduced into the LTE standard. This dynamic switch is based on a mechanism in which a cell is quickly turned on or off. When there is no UE in the small cell or a small cell and a small cell in the vicinity of the small cell are in a low load state, the current user served by the small cell may be considered to be switched to the adjacent small cell. The small cell is then turned off. When a new user arrives in a closed small cell, or a new packet of an existing user within its coverage arrives, or another event that meets the opening condition of the small cell occurs, this small The cell will be opened to serve new users or to offload large packet transfers.
  • the effect of such dynamic switching of the small cell is controllable. Because the user remains connected to the small cell, the small cell can switch the user to the neighboring cell before shutting down. For a user camping on a small cell of a dynamic switch, ie, the user is in the RRC_IDLE state in the small cell, the impact of such dynamic switching of the small cell may be uncontrollable. Because when a user is in an idle state, the user only keeps timing synchronization with the downlink signal of the cell, and regularly monitors The downlink signal quality of the cell and the broadcast information and paging information of the cell are monitored.
  • the cell does not even know how many UEs in the RRC_IDLE state are in its coverage.
  • the base station of the existing cell can only make the IDLE state UE change its camped cell relatively smoothly by Cell eselection or Cell selection, and cannot guarantee that each IDLE state UE starts this weight in time. Selection process.
  • one method is to completely prevent idle users from camping in a cell that can be dynamically switched. This may result in the user not being able to initiate a random access procedure to access the cell, but only to access the cell through the handover and be served by the base station of the cell. This is because a user needs to first camp on a cell in order to try to access the cell, and completely prohibiting idle users from camping on a cell that can be dynamically switched means that a user cannot initiate a random access procedure to access the cell. .
  • one macro station may cover multiple small cells. In order to avoid and coordinate interference between small cells, many small cells in these small cells may be dynamically switched.
  • the embodiment of the present invention provides a solution, which can be applied not only to the cell of the dynamic switch in the foregoing small cell system, but also to the scenario in which other cells are densely deployed. Do not use this as a limit.
  • FIG. 1 is a flowchart of the method. Referring to FIG. 1, the method includes:
  • Step 101 The base station of the cell sends indication information to the user equipment, where the indication information indicates whether the cell is a cell only for access-only.
  • the cell that can only be used for access means that the cell only allows the user to camp on the cell for the purpose of access. In other words, the cell does not allow the user to camp on the cell unless it attempts to access the cell after successfully camping on the cell.
  • An implementation manner of the foregoing attempting to access the cell may be: the UE starts a timer after successfully camping on the cell; if the UE does not start random in the cell within the timeout period of the timer Upon access, the UE performs cell reselection after the timer expires. If during the time of the timer, When the UE initiates random access in the cell, the timer can be stopped immediately, and the UE can perform a normal access procedure.
  • a cell is indicated as “only for access”, or the state of a cell is considered to be "only for access”, then a user will try only after successfully camping on the cell. Access to the cell, the user is allowed to camp on this cell, except that the user is not allowed to camp on the cell.
  • the indication information may further indicate that the user equipment is not allowed to camp on the cell unless the user equipment is successfully camped on. The cell is then attempted to access the cell.
  • the cell in addition to indicating the status of the cell (only for access or not only for access), in the case indicated as being used only for access, it also indicates what UE can camp on The cell further provides a basis for the UE to determine whether to camp/access the cell.
  • the indication information may be included in system information of the cell.
  • the system information here may be carried by the RRC (Radio Resource Control) signaling, or may be carried by the Physical Broadcast Channel (PBCH). This embodiment is not limited thereto.
  • RRC Radio Resource Control
  • PBCH Physical Broadcast Channel
  • the common RRC signaling may be first system information block (SIB1) signaling.
  • SIB1 first system information block
  • 1 bit can be added to SIB 1, for example the bit “cellAccessOnly” to indicate whether the cell is a cell for access only.
  • the bit may be an enumerated bit, and the value is "access only” or “not access only” to indicate whether the cell is used only for Accessed cell.
  • the field indicated by the bit “cellAccessOnly” may be common to these PLMNs, or may be specific to a PLMN, and this embodiment is not limited thereto.
  • the indication information may be carried by RRC signaling dedicated to the user equipment.
  • the RRC signaling specific to the user equipment carrying the indication information may be
  • the UE starts to be in a state of being connected to the cell, that is, maintaining the state of RRC_CONNECTED.
  • the base station of the cell sends the RRCConnectionRelease signaling to the UE, that is, when the UE is instructed to disconnect the RRC connection with the UE, the base station of the cell may carry the indication information in the RRCConnectionRelease signaling.
  • the UE is made aware of whether the cell is a "only for access" cell.
  • the method further includes:
  • Step 102 The base station of the cell sends the failure indication information to the user equipment, and the failure indication information indicates, under which circumstances, the indication message sent by the user equipment step 101 is invalid.
  • the UE can determine, in conjunction with the failure indication information, whether the cell is a cell for access only for the UE.
  • the specific determination method will be explained in the following examples.
  • the cell selection method may be used for the UE to perform cell selection, and may also be used for the UE to perform cell reselection.
  • the method of the embodiment is used to inform the UE of the current state of the cell (only for access or not only for access), and the UE can determine whether the cell can be selected according to the method as soon as possible, and accelerate the selection or weight of the UE to the suitable cell. selected.
  • the embodiment of the present invention further provides a cell selection device. As described in the following Embodiment 2, the principle of the cell selection device is similar to that of the embodiment 1. Therefore, the specific implementation may refer to Embodiment 1 The implementation of the method, the same content will not be repeated.
  • FIG. 2 is a schematic diagram of the device 200.
  • the apparatus 200 includes:
  • the sending unit 201 sends the indication information to the user equipment, where the indication information indicates whether the cell covered by the base station where the apparatus is located is a cell used only for access.
  • the indication information may further indicate that the user equipment is not allowed to reside in the The cell attempts to access the cell immediately after the user equipment successfully camps on the cell.
  • the indication information is included in system information of the cell.
  • the system information may be carried by a common radio resource control (RRC) signaling or may be carried by a physical broadcast channel (PBCH).
  • RRC radio resource control
  • PBCH physical broadcast channel
  • the common RRC signaling may be first system information block (SIB1) signaling.
  • SIB1 system information block
  • the indication information is carried by RRC signaling dedicated to the user equipment.
  • the sending unit 201 is further configured to send the failure indication information to the user equipment, so that the user equipment is configured according to the failure indication information or according to the failure indication information and the user equipment.
  • the capability determines whether the cell is a cell that can only be used for access.
  • the device in this embodiment informs the UE of the current state of the cell (only for access), and the UE can determine whether the cell can be selected according to the data, and accelerates the selection or reselection of the suitable cell by the UE.
  • FIG. 3 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present invention. As shown in Figure 3, the base station
  • the 300 can include: a central processing unit (CPU) 301 and a memory 302; and a memory 302 coupled to the central processor 301.
  • the memory 302 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processor 301 to receive various information transmitted by the user equipment and to transmit the request information to the user equipment.
  • the functionality of the cell selection device can be integrated into the central processor 301.
  • the central processing unit 301 can be configured to: send indication information to the user equipment, where the indication information indicates whether the cell covered by the base station is a cell that can only be used for access.
  • the indication information indicates that the cell covered by the base station where the device is located is a cell that is used only for access
  • the indication information further indicates that the user equipment is not allowed to camp in the cell unless the user The device attempts to access the cell after successfully camping on the cell.
  • the indication information is included in system information of the cell.
  • the system information is carried by a Public Radio Resource Control (RRC) signaling or by a Physical Broadcast Channel (PBCH).
  • RRC Public Radio Resource Control
  • PBCH Physical Broadcast Channel
  • the common RRC signaling is first system information block (SIB1) signaling.
  • SIB1 system information block
  • the indication information is carried by RRC signaling dedicated to the user equipment.
  • the cell selection can be configured separately from the central processing unit 301.
  • the cell selection device can be configured as a chip connected to the central processing unit 301, and the function of the cell selection device can be implemented by the control of the central processing unit 301.
  • the base station 300 may further include: a transceiver 303, an antenna 304, and the like; wherein the functions of the above components are similar to the prior art, and details are not described herein again. It should be noted that the base station 300 does not have to include all of the components shown in FIG. 3; in addition, the base station 300 may also include components not shown in FIG. 3, and reference may be made to the prior art.
  • the base station of the present embodiment informs the UE of the current state of the cell (only for access), and the UE can determine whether the cell can be selected according to the data, and accelerates the selection or reselection of the suitable cell by the UE.
  • Example 4
  • the embodiment of the present invention further provides a cell selection method, which is a process on the UE side corresponding to the method in Embodiment 1, and the same content as Embodiment 1 is not repeatedly described.
  • 4 is a flow chart of the method. Referring to FIG. 4, the method includes:
  • Step 401 The user equipment receives the indication information sent by the base station of the cell.
  • Step 402 The user equipment determines, according to the indication information, whether the cell is a cell that can only be used for access.
  • the foregoing indication information sent by the base station may be a specific indication, and all UEs that receive the indication information consider that the cell is used only for accessing the cell or not only for accessing. Community. That is, as long as the received indication information indicates that the cell is a cell that is only used for access, the user equipment determines that the cell is a cell that is only used for access; as long as the received indication information indicates The cell is a cell that is not only used for access, and the user equipment determines that the cell is a cell that is not only used for access.
  • the indication information sent by the base station may also be a specific indication, and the UE that receives the indication information may determine, according to its own capability, that the cell is used only for the UE. The cell is still a cell that can only be used for access.
  • the indication information indicates that the cell is a cell that can only be used for access. If the user equipment is a first type of user equipment, the user equipment determines that the cell is used for access only. a cell; if the user equipment is a second type of user equipment, the user equipment determines that the cell is a cell that is not only available for access.
  • the first type of user equipment is, for example, a relatively low-capacity UE, and the second type of user equipment is, for example, a relatively high-capacity UE. This embodiment is not limited thereto.
  • the base station sends the failure indication information in addition to the foregoing indication information, as described in Embodiment 1, in which case, the indication information and the failure indication information are received.
  • the UE may determine, according to the failure indication information or further combining its own capabilities, whether the cell is a cell that can only be used for access or a cell that is not only available for access.
  • the indication information indicates that the cell is a cell that can only be used for access.
  • the cell is dynamically switched, and the cell base station sends information related to the dynamic switch of the cell to the UE, which is simply referred to as dynamic switch information, such as a dynamic switch pattern (patt e m).
  • the dynamic switch information here is used as the above failure indication information. If the high-capability UE receives the indication information and the dynamic switch information at the same time, and confirms that the high-capability UE can normally camp on the cell during the dynamic switch of the cell, the high-capability UE The capability UE can consider the cell to be a cell that is not only available for access.
  • the low-capability UE receives the indication information and the dynamic switch information at the same time, and confirms that the low-capability UE cannot be normally camped on the cell during the dynamic switch of the cell based on the dynamic switch information, then the low-capability UE
  • the cell can be considered to be a cell that can only be used for access.
  • the user equipment may As one of the candidate cells for cell selection or reselection.
  • the user equipment may abandon the cell as one of candidate cells for cell selection or reselection.
  • the user equipment can store information related to the cell. For example: a cell identifier (ID), a cell frequency point, and/or a cell status, etc., as a reference for subsequent cell selection or reselection, where the cell status may include the cell being a cell that can only be used for access, and also Other content may be included, and the embodiment is not limited thereto.
  • the user equipment may use the cell as one of candidate cells for cell selection or reselection, and compare and evaluate the candidate cell by using the previously stored information about the cell during the selecting or reselecting process.
  • the UE may abandon the camping in the cell if it only wants to camp but does not want to access, or may also access the cell. In this case, the camping process is started first and then the random access in the cell is started after successful camping. This speeds up the UE's choice of the appropriate cell.
  • the UE may start a timer after successfully camping on the cell; if the UE does not initiate random access in the cell within the timeout period of the timer, the UE is After the timer expires, cell reselection is performed. If the UE initiates random access in the cell within the timeout period of the timer, the timer may be stopped, and the UE may perform a normal access procedure.
  • the UE may learn the indication of the base station by receiving system information (such as public RRC signaling or a PBCH channel), and may also know the base station by receiving user-specific RRC signaling. Instructions. This embodiment is not intended to be limiting.
  • the UE starts to be in a state of being connected to the cell, that is, maintaining the state of RRC_CO NECTED.
  • the base station of the cell sends RRCConnectionRelease signaling to the UE, it also refers to
  • the cell may carry the indication in the RRCConnectionRelease signaling, so that the UE knows whether the cell is "only for access” or "not only for the cell.”Access”.
  • cell selection or reselection is started, and the base station is not used as a candidate base station for cell reselection in the selection or reselection process.
  • the UE may also save related information of the base station.
  • the UE may also perform cell reselection in the process of performing random access.
  • the cell reselection of the random access procedure concurrently lists the cell "only for access" as one of the candidate base stations of the secondary cell reselection process.
  • the UE can determine whether to camp/access the cell according to the status of the received cell (for access only), thereby accelerating the UE's selection or reselection of the appropriate cell.
  • the embodiment of the present invention further provides a cell selection device.
  • the principle of solving the problem is similar to the method of the embodiment 4. Therefore, the specific implementation may refer to the method of the embodiment 4. Implementation, content is the same and will not be repeated.
  • FIG. 5 is a schematic diagram of the device 500.
  • the device includes:
  • Receiving unit 501 which receives indication information sent by a base station of the cell
  • the determining unit 502 determines, according to the indication information, whether the cell is a cell that can only be used for access.
  • the indication information indicates that the cell is a cell that can only be used for access, and the determining unit 502 determines that the cell is a cell that can only be used for access. .
  • the indication information indicates that the cell is a cell that can only be used for access
  • the determining unit 502 is configured according to the received failure indication information sent by the base station and/or Or UE capability, determining whether the cell is a cell that can only be used for access.
  • the determining unit 502 determines that the cell is a cell that can only be used for access. If the user equipment in which the device is located is a second type of user equipment, the determining unit 502 determines that the cell is a cell that is not only available for access.
  • the indication information indicates that the cell is a cell that is not only used for access
  • the determining unit 502 determines that the cell is a cell that is not only used for access
  • the UE may perform cell selection or reselection processing according to conventional means.
  • the device further includes: a determining unit 503, when the receiving unit 501 receives the indication information, determining whether the user equipment where the device is located is performing random access;
  • the processing unit 504 when the determining unit 503 determines that the user equipment is performing random access, uses the cell as one of candidate cells for cell reselection by the user equipment; When the user equipment does not perform random access, information related to the cell is stored.
  • the information related to the cell includes a cell identity (ID), a cell frequency point, and/or a cell status of the cell.
  • the cell status includes the cell being a cell that can only be used for access.
  • the processing unit 504 is further configured to perform random access in the user equipment, and the random access procedure is not completed, and the user equipment is about to initiate a cell selection or reselection.
  • the cell is used as one of candidate cells for cell selection or reselection, and compares and evaluates the candidate cell with the previously stored information about the cell during the selection or reselection process.
  • the device further includes:
  • the access control unit 505 when the determining unit 502 determines that the cell is a cell that can only be used for access, starts a preset timer after the user equipment where the device is located camps on the cell Determining, in the timeout period of the timer, whether the user equipment initiates random access in the cell, and if not, performing cell selection or reselection after the timer expires; if already started, Stop the timing of the timer.
  • the UE can determine whether to camp/access the cell according to the status of the received cell (for access only), thereby accelerating the UE's selection or reselection of the appropriate cell.
  • An embodiment of the present invention provides a user equipment, where the user equipment includes the cell selection apparatus according to Embodiment 5.
  • FIG. 6 is a schematic block diagram showing the system configuration of the user equipment 600 according to the embodiment of the present invention.
  • the user equipment 600 can include a central processing unit 601 and a memory 602; the memory 602 is coupled to the central processing unit 601.
  • the figure is exemplary; other types of structures may be used in addition to or in place of the structure to implement telecommunications functions or other functions.
  • the functionality of the cell selection device can be integrated into the central processor 601.
  • the central processing unit 601 can be configured to:
  • Receiving indication information sent by the base station of the cell Determining, according to the indication information, whether the cell is a cell that can only be used for access.
  • the central processor 601 is configured to determine that the cell is a cell that can only be used for access.
  • the central processing unit 601 is configured to: according to the received failure indication information sent by the base station, and/or Or its own capability, determining whether the cell is a cell that can only be used for access.
  • the central processing unit 601 is configured to determine that the cell is a cell that can only be used for access;
  • the central processor 601 is configured to determine that the cell is a cell that is not only available for access.
  • the central processing unit 601 is configured to determine that the cell is a cell that is not only used for access,
  • the central processing unit 601 is further configured to use the cell as one of candidate cells for cell reselection or selection when the user equipment is performing random access when receiving the indication information.
  • the central processor 601 is further configured to store information related to the cell in the memory 602 when the user equipment does not perform random access when receiving the indication information.
  • the information related to the cell includes a cell identifier (ID), a cell frequency point, and/or a cell status of the cell.
  • the cell status includes the cell being a cell that can only be used for access.
  • the central processing unit 601 is further configured to: when the user equipment is performing random access, and the random access procedure is not completed, and the user equipment is about to initiate a cell selection or reselection,
  • the cell is used as one of candidate cells for cell selection or reselection, and the candidate cells are compared and evaluated in the selection or reselection process by using the previously stored information about the cell.
  • the central processor 601 is configured to start a timer after the user equipment camps on the cell; During the timeout period of the timer, the user equipment does not initiate random access in the cell, and the central processor 601 is configured to perform cell reselection after the timer expires.
  • the cell selection device may be configured separately from the central processing unit 601.
  • the cell selection device may be configured as a chip connected to the central processing unit 601, and the function of the cell selection device is implemented by the control of the central processing unit 601. .
  • the user equipment 600 may further include: a communication module 603, an input unit 604, an audio processing unit 605, a display 606, and a power source 607. It should be noted that the user equipment 600 does not have to include all the components shown in FIG. 6; in addition, the user equipment 600 may further include components not shown in FIG. 6, and reference may be made to the prior art.
  • central processor 601 may include a microprocessor or other processor device and/or logic device that receives input and controls various aspects of user device 600. The operation of the part.
  • the memory 602 can be, for example, one or more of a buffer, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory, or other suitable device.
  • the above-mentioned information related to the failure can be stored, and a program for executing the related information can be stored.
  • the central processing unit 601 can execute the program stored in the memory 602 to implement information storage or processing and the like.
  • the functions of other components are similar to those of the existing ones and will not be described here.
  • the various components of user device 600 may be implemented by special purpose hardware, firmware, software, or a combination thereof without departing from the scope of the invention.
  • the embodiment of the present invention further provides a communication system, including the base station according to Embodiment 3 and the user equipment as described in Embodiment 6.
  • FIG. 7 is a schematic diagram of a configuration of a communication system according to an embodiment of the present invention.
  • the communication system 700 includes a base station 701 and a user equipment 702.
  • the base station 701 may be the base station 300 described in Embodiment 3; the user equipment 702 may be the user equipment 600 described in Embodiment 6. among them,
  • the base station 701 is configured to send indication information to the user equipment, where the indication information indicates whether the cell covered by the base station is a cell that can only be used for access;
  • the user equipment 702 is configured to receive the indication information, and determine, according to the indication information, whether the cell is a cell that can only be used for access.
  • the UE can determine whether to camp/access the cell according to the status of the received cell (for access only), thereby accelerating the UE's selection or reselection of the appropriate cell.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to execute the cell selection method described in Embodiment 1 in the base station.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the cell selection method described in Embodiment 1 in a base station.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a user equipment, the program causes the computer to execute the cell selection method described in Embodiment 4 in the user equipment.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the cell selection method described in Embodiment 4 in a user equipment.
  • the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

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Abstract

本发明实施例提供一种小区选择方法、装置和通信系统。该方法包括:小区的基站向用户设备发送指示信息,所述指示信息指示了所述小区是否为只能用于接入的小区。用户设备接收所述指示信息,根据所述指示信息或者根据所述指示信息以及其他一些因素确定所述小区是否为只能用于接入的小区。通过本实施例的方法、装置和系统,UE可以根据接收到的小区的状态(只用于接入)确定是否驻留/接入该小区,由此加速了UE对合适小区的选择或重选。

Description

小区选择方法、 装置和通信系统 技术领域
本发明涉及通信领域, 特别涉及一种小区选择方法、 装置和通信系统。 背景技术
移动通信发展中从第一代移动通信到第四代移动通信, 频谱效率 (Spectrum Efficiency, SE) 始终是评价一个移动通信系统的重要指标之一。 如何能够提高频谱 效率进一步提高用户 (UE, User Equipment)传输速率也是移动通信系统设计过程中 着重解决的问题之一。在目前讨论的第五代移动通信构想中, 绿色通信成为第五代移 动通信的愿景。 在学术界和产业界的广泛讨论中, 除 SE 以外, 能量效率 (Energy Efficiency, EE) 也有望成为衡量移动通信重要指标。
在前四代移动通信中, 主要以宏小区 (Macro cell)为主。 而在未来移动通信中, 为 了保证覆盖又能合理调整业务需求与设备开销, 宏小区和小小区 (small cells) 共存 的异构部署 (Heterogeneous deployment), 由宏小区负责用户的覆盖, 由小小区负责 用户的数据卸载 (offloading) 将成为移动通信系统的主要部署场景之一。 典型的小 小区包括微蜂窝 (micro cells)、 毫微蜂窝 (Pico Cells) 和毫微微蜂窝 ( Femto cells )。 与小小区相比, 宏小区基站的发射功率比较大。 相应地, 宏小区基站的功率放大器 (Power Amplifier, PA)和射频单元 (Radio Frequency, F) 的功耗也很大, 为了维 持基站设备的正常运行还需要配置一些空调设备。 因此, 宏小区基站的 EE显著低于 小小区。 小小区在节能以及灵活部署方面有明显优势。
通常情况下,每个宏小区所服务的用户数目较多, 因此用户总数以及整个小区总 的上下行业务整体趋于稳定。小小区的覆盖面积较小,每个小小区同时服务的用户数 目远小于宏小区的用户数。较小的覆盖面积还使得移动中的用户停留在一个小小区内 的时间也较短, 即使该用户的移动速度较慢。。 例如, 假设小小区直径为 50m, 用户 的移动速度为 3公里每小时 (步行移动速度), 那么该用户落在该小小区覆盖范围的 持续时间仅为 60秒。 所以, 小小区内用户的动态变化 (用户加入一个小小区或者离 开一个小小区)也是非常快的。 除此以外, 正因为小小区服务的用户数目较少, 任何 一个用户发起新的业务或者结束现有业务都可能改变整个小小区的上下行数据需求。 小小区的这种相对较快的动态变换,可能造成用户数以及数据需求在各个小小区 间的不均衡分布。例如, 一个小小区满负载运行的时候, 相邻小小区可能处于低负载 甚至闲置状态。
应该注意, 上面对技术背景的介绍只是为了方便对本发明的技术方案进行清楚、 完整的说明, 并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本发 明的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。 发明内容
本发明实施例提供一种小区选择的方法、装置以及通信系统, 以加速用户对合适 小区的选择。
根据本发明实施例的第一方面,提供了一种小区选择方法,其中,所述方法包括: 小区的基站向用户设备发送指示信息,所述指示信息指示了所述小区是否为只能 用于接入的小区。
根据本发明实施例的第二方面,提供了一种小区选择方法,其中,所述方法包括: 用户设备接收小区的基站发送的指示信息;
所述用户设备根据所述指示信息确定所述小区是否为只能用于接入的小区。 根据本发明实施例的第三方面,提供了一种小区选择装置,其中,所述装置包括: 发送单元,其向用户设备发送指示信息,所述指示信息指示了所述装置所在的基 站覆盖的小区是否为只能用于接入的小区。
根据本发明实施例的第四方面,提供了一种小区选择装置,其中,所述装置包括: 接收单元, 其接收小区的基站发送的指示信息;
确定单元, 其根据所述指示信息确定所述小区是否为只能用于接入的小区。 根据本发明实施例的第五方面 , 提供了一种基站, 其中, 所述基站包括前述第三 方面所述的小区选择装置。
根据本发明实施例的第六方面, 提供了一种用户设备, 其中, 所述用户设备包括 前述第四方面所述的小区选择装置
根据本发明实施例的第七方面,提供了一种通信系统,所述通信系统包括基站和 用户设备, 其中,
所述基站被配置为向用户设备发送指示信息,所述指示信息指示了所述基站覆盖 的小区是否为只能用于接入的小区;
所述用户设备被配置为接收所述指示信息,根据所述指示信息确定所述小区是否 为只能用于接入的小区。
根据本发明实施例的其他方面,提供了一种计算机可读程序,其中当在基站中执 行所述程序时,所述程序使得计算机在所述基站中执行前述第一方面所述的小区选择 方法。
根据本发明实施例的其他方面, 提供了一种存储有计算机可读程序的存储介质, 其中所述计算机可读程序使得计算机在基站中执行前述第一方面所述的小区选择方 法。
根据本发明实施例的其他方面,提供了一种计算机可读程序,其中当在用户设备 中执行所述程序时,所述程序使得计算机在所述用户设备中执行前述第二方面所述的 小区选择方法。
根据本发明实施例的其他方面, 提供了一种存储有计算机可读程序的存储介质, 其中所述计算机可读程序使得计算机在用户设备中执行前述第二方面所述的小区选 择方法。
本发明实施例的有益效果在于: 通过本发明实施例的小区选择方法、装置以及通 信系统, 能够节约能量并降低小区密集分布时小区间的干扰。
参照后文的说明和附图,详细公开了本发明的特定实施方式,指明了本发明的原 理可以被采用的方式。应该理解, 本发明的实施方式在范围上并不因而受到限制。在 所附权利要求的精神和条款的范围内,本发明的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和 /或示出的特征可以以相同或类似的方式在一个或更多 个其它实施方式中使用, 与其它实施方式中的特征相组合, 或替代其它实施方式中的 特征。
应该强调, 术语"包括 /包含"在本文使用时指特征、 整件、 步骤或组件的存在, 但并不排除一个或更多个其它特征、 整件、 步骤或组件的存在或附加。 附图说明
所包括的附图用来提供对本发明实施例的进一步的理解,其构成了说明书的一部 分, 用于例示本发明的实施方式, 并与文字描述一起来阐释本发明的原理。 显而易见 地, 下面描述中的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。 在附图中: 图 1是本发明实施例的小区选择方法的一个实施方式的流程图;
图 2是本发明实施例的小区选择装置的一个实施方式的组成示意图;
图 3是本发明实施例的基站的一个实施方式的组成示意图;
图 4是本发明实施例的小区选择方法的另一个实施方式的流程图;
图 5是本发明实施例的小区选择装置的另一个实施方式的组成示意图; 图 6是本发明实施例的用户设备的一个实施方式的组成示意图;
图 7是本发明实施例的通信系统的拓扑结构示意图。 具体实施方式
参照附图, 通过下面的说明书, 本发明的前述以及其它特征将变得明显。在说明 书和附图中, 具体公开了本发明的特定实施方式,其表明了其中可以采用本发明的原 则的部分实施方式, 应了解的是, 本发明不限于所描述的实施方式, 相反, 本发明包 括落入所附权利要求的范围内的全部修改、变型以及等同物。下面结合附图对本发明 的各种实施方式进行说明。 这些实施方式只是示例性的, 不是对本发明的限制。
为了节能以及降低小小区密集分布时小区间的干扰,一种动态开关小小区的方法 被引入到了 LTE标准中。 这种动态开关基于一种小区快速打开或者关闭的机制。 当 某个小小区内没有需要服务的 UE或者某个小小区以及其周围的小小区都处于低负载 的状况, 则可以考虑将该小小区所服务的当前用户切换至相邻的小小区中, 而后将该 小小区关闭。当一个关闭的小小区内有一个新的用户到达, 或者一个在其覆盖范围内 的既有用户的一个新的数据包到达的时候,或者其它符合该小小区打开条件的事件发 生时, 这个小小区会被打开, 用来服务新用户或者卸载大数据包传输等等。
对于一个被某动态开关的小小区服务的用户, 即该用户在该小小区中处于 RRC_CO NECTED状态, 小小区的这种动态开关产生的影响是可控的。 因为该用户 与小小区保持连接, 小小区可以在关闭之前将该用户切换至相邻小区。对于一个驻留 (Camp) 在某动态开关的小小区的用户, 即该用户在该小小区中处于 RRC_IDLE状 态, 小小区的这种动态开关产生的影响可能是不可控的。因为当一个用户在一个小区 处于闲置状态的时候, 该用户仅仅保持着与该小区下行信号的定时同步, 并定期监控 该小区下行信号质量以及监听该小区的广播信息和寻呼 (Paging)信息。 在这种情况 下, 小区甚至不知道在它的覆盖范围里到底有多少处于 RRC_IDLE状态的 UE。现有 的小区的基站只能尽量令 IDLE态 UE比较平稳地通过小区重选 (Cell eselection) 或者小区选择(Cell selection)改变它的驻留小区而没有能力保证每一个 IDLE态 UE 及时开始这个重选过程。
为了解决这一问题,一种方法是彻底不允许闲置用户驻留在可以动态开关的小区 中。这可能会导致用户不能主动发起接入该小区的随机接入过程, 而只能通过切换接 入该小区并被该小区的基站服务。这是因为一个用户需要首先驻留在一个小区才能尝 试接入该小区,完全不允许闲置用户驻留在可以动态开关的小区中就意味着一个用户 不能主动发起接入该小区的随机接入过程。在小小区密集部署的场景下, 一个宏站可 能覆盖多个小小区, 为了回避和协调小小区之间的干扰,这些小小区中的很多小小区 都可能是动态开关的。因此, 如果用户仅仅通过切换才能被小小区服务可能导致大量 的不必要的切换操作, 且这种切换还可能带来额外的时延。研究表明, 当一个或多个 用户需要被某个小小区服务时, 小小区开始这种服务越及时, 网络获得的增益越大。
为了解决这一问题,本发明实施例提供了一种解决方案, 该方案不仅可以应用于 前述小小区系统下的动态开关的小区, 也可以应用于其他小区密集部署的场景中,本 实施例并不以此作为限制。
下面结合附图对本发明实施例的方法、 装置和系统进行说明。
实施例 1
本发明实施例提供了一种小区选择方法, 图 1是该方法的流程图, 请参照图 1, 该方法包括:
步骤 101 : 小区的基站向用户设备发送指示信息, 所述指示信息指示了所述小区 是否为只用于接入 (access-only) 的小区。
在本实施例中,只能用于接入的小区是指该小区只允许用户以接入为目的驻留在 该小区。 换句话说, 除非该用户在成功驻留在该小区后随即尝试接入该小区, 否则该 小区不允许用户驻留在其上。
其中, 上述的随即尝试接入该小区的一种实施方式可以是, UE在成功驻留到该 小区后启动计时器; 如果在该计时器的计时时间内, 该 UE没有启动在该小区的随机 接入, 则该 UE在该计时器超时后进行小区重选。 如果在该计时器的计时时间内, 该 UE启动了在该小区的随机接入, 则该计时器可以随即停止, 该 UE可以进行正常的 接入过程。
在本实施例中, 如果一个小区被指示为 "只用于接入", 或者一个小区的状态被 认为是 "只用于接入", 那么一个用户只有在成功驻留在该小区后随即尝试接入该小 区, 该用户才被允许驻留在这个小区, 除此之外, 该用户不允许驻留在该小区。
在本实施例的一个实施方式中, 如果一个小区被指示为只用于接入, 则该指示信 息还可以指示不允许用户设备驻留在所述小区除非所述用户设备在成功驻留在所述 小区后随即尝试接入所述小区。
在本实施方式中, 除了指示小区的状态(只用于接入或非只用于接入) 以外, 在 指示为只用于接入的情况下, 还指示了什么样的 UE 可以驻留在该小区, 进一步为 UE确定是否驻留 /接入该小区提供了依据。
在本实施例的一个实施方式中, 该指示信息可以包含在所述小区的系统信息中。 这里的系统信息可以由公共无线资源控制(RRC, Radio Resource Control)信令承载, 也可以由物理广播信道(PBCH, Physical Broadcast Channel)承载, 本实施例并不以 此作为限制。
在本实施方式中, 该公共 RRC信令可以是第一系统信息块(SIB1 )信令。例如, 可以在 SIB 1里增加 1比特, 例如比特 " cellAccessOnly"来指示该小区是否为只用于 接入的小区。其中, 该比特可以是枚举型比特, 其取值为 " access only (只用于接入)" 或者 "not access only (非只用于接入)"来分别指示该小区是否为只用于接入的小区。
在本实施方式中, 当有多个陆地公用移动通信网 (Public Land Mobile Network,
PLMN) 在 SIB l里被指示时, 由比特 " cellAccessOnly"指示的域可以是这些 PLMN 通用的, 也可以是某个 PLMN专用的, 本实施例并不以此作为限制。
在本实施例的另一个实施方式中, 该指示信息可以由用户设备专用的 RRC信令 承载。
在本实施方式中, 承载该指示信息的用户设备专用的 RRC 信令可以是
RRCConnectionRelease信令。 例如, 该 UE开始处于与该小区连接的状态, 也就是保 持着 RRC_CONNECTED 的状态 。 当 该小 区 的基站 向 该 UE 发送 RRCConnectionRelease信令的时候, 也就是指示该 UE断开与该小区的 RRC连接的 时候, 该小区的基站可以通过在 RRCConnectionRelease信令中携带该指示信息, 从 而使该 UE得知该小区是否是 "只用于接入" 的小区。
在本实施例的一个实施方式中, 该方法还包括:
步骤 102: 小区的基站向用户设备发送失效指示信息, 通过上述失效指示信息指 示所述用户设备步骤 101发送的指示消息在什么情况下失效。 由此, UE可以结合该 失效指示信息确定对于该 UE来说该小区是否为只用于接入的小区。其中, 具体的确 定方法将在以下的实施例中进行说明。
在本实施例中, 该小区选择方法可以用于 UE进行小区选择, 也可以用于 UE进 行小区重选。
通过本实施例的方法将小区当前的状态(只用于接入或非只用于接入)告知 UE, UE可以据此尽快确定是否能选择该小区, 加速了 UE对合适小区的选择或重选。 本 发明实施例还提供了一种小区选择装置, 如下面的实施例 2所述, 由于该小区选择装 置解决问题的原理与实施例 1的方法类似,因此其具体的实施可以参照实施例 1的方 法的实施, 内容相同之处不再重复说明。
实施例 2
本发明实施例提供了一种小区选择装置, 图 2是该装置 200的组成示意图, 如图
2所示, 该装置 200包括:
发送单元 201, 其向用户设备发送指示信息, 所述指示信息指示了所述装置所在 的基站覆盖的小区是否为只用于接入的小区。
在本实施例的一个实施方式中,如果该指示信息指示了所述装置所在的基站覆盖 的小区为只用于接入的小区,则该指示信息还可以指示不允许用户设备驻留在所述小 区除非所述用户设备在成功驻留在所述小区后随即尝试接入所述小区。
在本实施例的一个实施方式中, 该指示信息包含在所述小区的系统信息中。 其中, 所述系统信息可以由公共无线资源控制(RRC)信令承载, 也可以由物理 广播信道 (PBCH) 承载。
其中, 该公共 RRC信令可以为第一系统信息块 (SIB1 ) 信令。
在本实施例的另一个实施方式中,该指示信息由用户设备专用的 RRC信令承载。 在本实施例的一个实施方式中,发送单元 201还用于向所述用户设备发送失效指 示信息,以便所述用户设备根据所述失效指示信息或者根据所述失效指示信息以及所 述用户设备的能力确定所述小区是否为只能用于接入的小区。 通过本实施例的装置将小区当前的状态 (只用于接入) 告知 UE, UE可以据此 尽快确定是否能选择该小区, 加速了 UE对合适小区的选择或重选。
实施例 3
本发明实施例提供了一种基站, 该基站包括如实施例 2所述的小区选择装置。 图 3是本发明实施例的基站的一个实施方式的构成示意图。 如图 3所示, 基站
300可以包括: 中央处理器 (CPU) 301和存储器 302; 存储器 302耦合到中央处理 器 301。 其中该存储器 302可存储各种数据; 此外还存储信息处理的程序, 并且在中 央处理器 301的控制下执行该程序, 以接收该用户设备发送的各种信息、并且向用户 设备发送请求信息。
在一个实施方式中,小区选择装置的功能可以被集成到中央处理器 301中。其中, 中央处理器 301可以被配置为: 向用户设备发送指示信息,所述指示信息指示了所述 基站覆盖的小区是否为只能用于接入的小区。
可选的,在该指示信息指示了所述装置所在的基站覆盖的小区为只用于接入的小 区时,所述指示信息还指示了不允许用户设备驻留在所述小区除非所述用户设备在成 功驻留在所述小区后随即尝试接入所述小区。
可选的, 所述指示信息包含在所述小区的系统信息中。
可选的, 所述系统信息由公共无线资源控制(RRC)信令承载或者由物理广播信 道 (PBCH) 承载。
可选的, 所述公共 RRC信令为第一系统信息块 (SIB1 ) 信令。
可选的, 所述指示信息由用户设备专用的 RRC信令承载。
在另一个实施方式中, 小区选择可以与中央处理器 301分开配置,例如可以将小 区选择装置配置为与中央处理器 301连接的芯片,通过中央处理器 301的控制来实现 小区选择装置的功能。
此外, 如图 3所示, 基站 300还可以包括: 收发机 303和天线 304等; 其中, 上 述部件的功能与现有技术类似, 此处不再赘述。值得注意的是, 基站 300也并不是必 须要包括图 3中所示的所有部件;此外,基站 300还可以包括图 3中没有示出的部件, 可以参考现有技术。
通过本实施例的基站将小区当前的状态 (只用于接入) 告知 UE, UE可以据此 尽快确定是否能选择该小区, 加速了 UE对合适小区的选择或重选。 实施例 4
本发明实施例还提供了一种小区选择方法, 该方法是与实施例 1 的方法对应的 UE侧的处理, 其中与实施例 1相同的内容不再重复说明。 图 4是该方法的流程图, 请参照图 4, 该方法包括:
步骤 401 : 用户设备接收小区的基站发送的指示信息;
步骤 402: 所述用户设备根据所述指示信息确定所述小区是否为只能用于接入的 小区。
在本实施例的一个实施方式中,基站发送的上述指示信息可以是具体的指示,所 有接收到该指示信息的 UE都认为该小区是只用于接入的小区或者是非只用于接入的 小区。 也即, 只要接收到的该指示信息指示了所述小区为只用于接入的小区, 用户设 备就确定所述小区为只用于接入的小区;只要接收到的该指示信息指示了所述小区为 非只用于接入的小区, 用户设备就确定所述小区为非只用于接入的小区。
在本实施例的另一个实施方式中, 基站发送的上述指示信息也可以是具体的指 示, 接收到该指示信息的 UE可以结合自身能力, 来确定该小区对于该 UE是只能用 于接入的小区还是非只能用于接入的小区。
例如,所述指示信息指示了所述小区为只能用于接入的小区, 如果所述用户设备 为第一类用户设备, 则所述用户设备确定所述小区为只能用于接入的小区; 如果所述 用户设备为第二类用户设备, 则所述用户设备确定所述小区为非只能用于接入的小 区。 其中, 该第一类用户设备例如为相对低能力的 UE, 该第二类用户设备例如为相 对高能力的 UE, 本实施例并不以此作为限制。
在本实施例的另一个实施方式中,基站除了发送上述指示信息以外,还发送了失 效指示信息, 如实施例 1所述, 在这种情况下, 接收到该指示信息和该失效指示信息 的 UE可以根据该失效指示信息或者进一步结合自身能力, 来确定该小区对于该 UE 是只能用于接入的小区还是非只能用于接入的小区。
例如, 所述指示信息指示了所述小区为只能用于接入的小区。 同时, 该小区是动 态开关的, 该小区基站向 UE发送了与该小区动态开关相关的信息, 简称为动态开关 信息, 如动态开关图样 (pattem)。 这里的动态开关信息即作为上述失效指示信息。 如果高能力 UE同时接收到了该指示信息以及该动态开关信息,并确认基于该动态开 关信息, 该高能力 UE可以在该小区动态开关的过程中正常驻留在该小区, 那么该高 能力 UE可以认为该小区是非只能用于接入的小区。 如果低能力 UE同时接收到了该 指示信息以及该动态开关信息, 并确认基于该动态开关信息, 该低能力 UE不能够在 该小区动态开关的过程中正常驻留在该小区,那么该低能力 UE可以认为该小区是只 能用于接入的小区。
在本实施例的一个实施方式中,如果该用户设备在接收所述指示信息时正在进行 随机接入 (Random Access, A) , 且该随机接入过程尚未完成, 则该用户设备可以 将该小区作为小区选择或重选的候选小区之一。
在本实施例的另一个实施方式中,如果该用户设备在接收所述指示信息时没有进 行随机接入, 则该用户设备可以放弃将该小区作为小区选择或重选的候选小区之一, 此时, 该用户设备可以存储与该小区相关的信息。 例如: 小区标识(ID)、 小区频点、 和 /或小区状态等, 以作为后续小区选择或重选的参考, 这里的小区状态可以包括所 述小区为只能用于接入的小区, 也可以包括其他内容, 本实施例并不以此作为限制。
在本实施例的又一个实施方式中,在存储了上述与该小区相关的信息之后, 如果 该用户设备正在进行随机接入, 且该随机接入过程尚未完成, 且该用户即将启动一次 小区选择或重选, 则该用户设备可以将该小区作为小区选择或重选的候选小区之一, 并在选择或重选过程中利用之前存储的该小区相关的信息对该候选小区进行比较和 评估。
在本实施例中, 如果确定该小区为只能用于接入的小区, 则该 UE可以在只想驻 留而不想接入的情况下放弃驻留在该小区,也可以在希望接入的情况下先启动驻留过 程再在成功驻留后启动在该小区的随机接入。 由此加速了 UE对合适小区的选择。
在本实施例的一个实施方式中, UE可以在成功驻留到该小区后启动计时器; 如 果在该计时器的计时时间内, 该 UE没有启动在该小区的随机接入, 则该 UE在该计 时器超时后进行小区重选。 如果在该计时器的计时时间内, 该 UE启动了在该小区的 随机接入, 则该计时器可以随即停止, 该 UE可以进行正常的接入过程。
在本实施例中, 与实施例 1对应的, UE可以通过接收系统信息(例如公共 RRC 信令或者 PBCH信道) 从而得知基站的指示, 也可以通过接收用户专用的 RRC信令 从而得知基站的指示。 本实施例并不以此作为限制。
例如, 该 UE开始处于与该小区连接的状态, 也就是保持着 RRC_CO NECTED 的状态。当该小区的基站向该 UE发送 RRCConnectionRelease信令的时候,也就是指 示该 UE断开与该小区的 RRC连接的时候,该小区可以通过在 RRCConnectionRelease 信令中携带该指示, 从而使 UE得知, 该小区是 "只用于接入"的还是 "非只用于接 入" 的。 该 UE断开与该基站的 RRC连接后, 随即开始进行小区选择或重选, 并且 在选择或重选过程中不会把该基站作为小区重选的候选基站。该 UE还可以保存该基 站的相关信息, 当该 UE再次通过发起随机接入尝试与某一个基站进行连接的时候, 在进行随机接入的过程中,该 UE还可以进行小区重选并在与随机接入过程并发的小 区重选中将 "只用于接入" 的小区列为该次小区重选过程的候选基站之一。
通过本实施例的方法, UE可以根据接收到的小区的状态 (只用于接入) 确定是 否驻留 /接入该小区, 从而加速了 UE对合适小区的选择或重选。
本发明实施例还提供了一种小区选择装置, 如下面的实施例 5所述, 由于该装置 解决问题的原理与实施例 4的方法类似,因此其具体的实施可以参照实施例 4的方法 的实施, 内容相同之处不再重复说明。
实施例 5
本发明实施例提供了一种小区选择装置, 图 5是该装置 500的组成示意图,请参 照图 5, 该装置包括:
接收单元 501, 其接收小区的基站发送的指示信息;
确定单元 502, 其根据所述指示信息确定所述小区是否为只能用于接入的小区。 在本实施例的一个实施方式中,所述指示信息指示了所述小区为只能用于接入的 小区, 则所述确定单元 502据此确定所述小区为只能用于接入的小区。
在本实施例的另一个实施方式中,所述指示信息指示了所述小区为只能用于接入 的小区, 则所述确定单元 502 根据接收到的所述基站发送的失效指示信息和 /或 UE 能力, 确定所述小区是否为只能用于接入的小区。
例如, 如果所述装置所在的用户设备为第一类用户设备时, 则所述确定单元 502 确定所述小区为只能用于接入的小区。如果所述装置所在的用户设备为第二类用户设 备时, 则所述确定单元 502确定所述小区为非只能用于接入的小区。
在本实施例的又一个实施方式中,所述指示信息指示了所述小区为非只用于接入 的小区, 则所述确定单元 502确定所述小区为非只用于接入的小区, 此时, UE可以 按照常规手段进行小区选择或重选的处理。
在本实施例的一个实施方式中, 所述装置还包括: 判断单元 503, 其在所述接收单元 501在接收所述指示信息时, 判断所述装置所 在的用户设备是否正在进行随机接入;
处理单元 504,其在所述判断单元 503判断为所述用户设备正在进行随机接入时, 将所述小区作为所述用户设备进行小区重选的候选小区之一; 在所述判断单元 503 判断为所述用户设备没有进行随机接入时, 存储与所述小区相关的信息。其中, 与所 述小区相关的信息包括所述小区的小区标识(ID)、小区频点、和 /或小区状态。其中, 所述小区状态包括所述小区为只能用于接入的小区。
在本实施例的一个实施方式中,所述处理单元 504还用于在所述用户设备正在进 行随机接入, 且该随机接入过程没有完成, 而该用户设备即将启动一次小区选择或重 选时,将该小区作为小区选择或重选的候选小区之一, 并在选择或重选过程中利用之 前存储的该小区相关的信息对该候选小区进行比较和评估。
在本实施例的一个实施方式中, 所述装置还包括:
接入控制单元 505, 其在所述确定单元 502确定所述小区为只能用于接入的小区 时,在所述装置所在的用户设备驻留到所述小区后启动预先设定的计时器,在所述计 时器的计时时间内判断所述用户设备是否启动在所述小区的随机接入, 如果没有启 动, 则在所述计时器超时后进行小区选择或重选; 如果已经启动, 则停止所述计时器 的计时。
通过本实施例的装置, UE可以根据接收到的小区的状态 (只用于接入) 确定是 否驻留 /接入该小区, 由此加速了 UE对合适小区的选择或重选。
实施例 6
本发明实施例提供了一种用户设备,该用户设备包括如实施例 5所述的小区选择 装置。
图 6是本发明实施例的用户设备 600的系统构成的一示意框图。如图 6所示, 该 用户设备 600可以包括中央处理器 601和存储器 602; 存储器 602耦合到中央处理器 601。 值得注意的是, 该图是示例性的; 还可以使用其他类型的结构, 来补充或代替 该结构, 以实现电信功能或其他功能。
在一个实施方式中,小区选择装置的功能可以被集成到中央处理器 601中。其中, 中央处理器 601可以被配置为:
接收小区的基站发送的指示信息; 根据所述指示信息确定所述小区是否为只能用于接入的小区。
在一个实施方式中, 如果所述指示信息指示了所述小区为只能用于接入的小区, 则所述中央处理器 601被配置为确定所述小区为只能用于接入的小区。
在一个实施方式中, 如果所述指示信息指示了所述小区为只能用于接入的小区, 则所述中央处理器 601 被配置为根据接收到的所述基站发送的失效指示信息和 /或自 身能力, 确定所述小区是否为只能用于接入的小区。
其中,如果所述用户设备为第一类用户设备, 则所述中央处理器 601被配置为确 定所述小区为只能用于接入的小区;
如果所述用户设备为第二类用户设备,则所述中央处理器 601被配置为确定所述 小区为非只能用于接入的小区。
在一个实施方式中, 如果所述指示信息指示了所述小区为非只用于接入的小区, 则所述中央处理器 601被配置为确定所述小区为非只用于接入的小区,
在一个实施方式中,所述中央处理器 601还被配置为当接收所述指示信息时所述 用户设备正在进行随机接入时, 将所述小区作为小区重选或选择的候选小区之一。
在一个实施方式中,所述中央处理器 601还被配置为当接收所述指示信息时所述 用户设备没有进行随机接入时,将与所述小区相关的信息存储到存储器 602中。其中, 与所述小区相关的信息包括所述小区的小区标识 (ID)、 小区频点、 和 /或小区状态。 其中, 所述小区状态包括所述小区为只能用于接入的小区。
在一个实施方式中,所述中央处理器 601还被配置为当所述用户设备正在进行随 机接入,且该随机接入过程没有完成,而该用户设备即将启动一次小区选择或重选时, 将该小区作为小区选择或重选的候选小区之一,并在选择或重选过程中利用之前存储 的该小区相关的信息对该候选小区进行比较和评估。
在一个实施方式中, 如果确定所述小区为只能用于接入的小区, 则所述中央处理 器 601被配置为在所述用户设备驻留到所述小区后启动计时器;如果在所述计时器的 计时时间内,所述用户设备没有启动在所述小区的随机接入, 则中央处理器 601被配 置为在所述计时器超时后进行小区重选。
在另一个实施方式中, 小区选择装置可以与中央处理器 601分开配置,例如可以 将小区选择装置配置为与中央处理器 601连接的芯片,通过中央处理器 601的控制来 实现小区选择装置的功能。 如图 6所示, 该用户设备 600还可以包括: 通信模块 603、 输入单元 604、 音频 处理单元 605、 显示器 606、 电源 607。 值得注意的是, 用户设备 600也并不是必须 要包括图 6中所示的所有部件; 此外,用户设备 600还可以包括图 6中没有示出的部 件, 可以参考现有技术。
如图 6所示, 中央处理器 601有时也称为控制器或操作控件,可以包括微处理器 或其他处理器装置和 /或逻辑装置, 该中央处理器 601 接收输入并控制用户设备 600 的各个部件的操作。
其中, 存储器 602, 例如可以是缓存器、 闪存、 硬驱、 可移动介质、 易失性存储 器、非易失性存储器或其它合适装置中的一种或更多种。可储存上述与失败有关的信 息, 此外还可存储执行有关信息的程序。 并且中央处理器 601 可执行该存储器 602 存储的该程序, 以实现信息存储或处理等。其他部件的功能与现有类似, 此处不再赘 述。 用户设备 600的各部件可以通过专用硬件、 固件、 软件或其结合来实现, 而不偏 离本发明的范围。
通过本实施例的用户设备, 可以根据接收到的小区的状态(只用于接入)确定是 否驻留 /接入该小区, 由此加速了对合适小区的选择或重选。
实施例 7
本发明实施例还提供了一种通信系统,包括如实施例 3所述的基站以及如实施例 6所述的用户设备。
图 7是本发明实施例的通信系统的一构成示意图, 如图 7所示, 该通信系统 700 包括基站 701以及用户设备 702。其中,基站 701可以是实施例 3中所述的基站 300; 用户设备 702可以是实施例 6所述的用户设备 600。 其中,
基站 701被配置为向用户设备发送指示信息,所述指示信息指示了所述基站覆盖 的小区是否为只能用于接入的小区;
用户设备 702被配置为接收所述指示信息,根据所述指示信息确定所述小区是否 为只能用于接入的小区。
由于在实施例 3和实施例 6中, 已经分别对基站和用户设备做了详细说明,其内 容被合并于此, 在此不再赘述。
通过本实施例的通信系统, UE可以根据接收到的小区的状态 (只用于接入) 确 定是否驻留 /接入该小区, 由此加速了 UE对合适小区的选择或重选。 本发明实施例还提供了一种计算机可读程序, 其中当在基站中执行所述程序时, 所述程序使得计算机在所述基站中执行实施例 1所述的小区选择方法。
本发明实施例还提供了一种存储有计算机可读程序的存储介质,其中所述计算机 可读程序使得计算机在基站中执行实施例 1所述的小区选择方法。
本发明实施例还提供了一种计算机可读程序,其中当在用户设备中执行所述程序 时, 所述程序使得计算机在所述用户设备中执行实施例 4所述的小区选择方法。
本发明实施例还提供了一种存储有计算机可读程序的存储介质,其中所述计算机 可读程序使得计算机在用户设备中执行实施例 4所述的小区选择方法。 本发明以上的装置和方法可以由硬件实现, 也可以由硬件结合软件实现。本发明 涉及这样的计算机可读程序, 当该程序被逻辑部件所执行时, 能够使该逻辑部件实现 上文所述的装置或构成部件, 或使该逻辑部件实现上文所述的各种方法或步骤。逻辑 部件例如现场可编程逻辑部件、微处理器、计算机中使用的处理器等。本发明还涉及 用于存储以上程序的存储介质, 如硬盘、 磁盘、 光盘、 DVD、 flash存储器等。
以上结合具体的实施方式对本发明进行了描述,但本领域技术人员应该清楚,这 些描述都是示例性的, 并不是对本发明保护范围的限制。本领域技术人员可以根据本 发明的精神和原理对本发明做出各种变型和修改,这些变型和修改也在本发明的范围 内。

Claims

权 利 要 求 书
1、 一种小区选择装置, 其中, 所述装置包括:
发送单元,其向用户设备发送指示信息,所述指示信息指示了所述装置所在的基 站覆盖的小区是否为只能用于接入的小区。
2、 根据权利要求 1所述的装置, 其中, 如果所述指示信息指示了所述装置所在 的基站覆盖的小区为只能用于接入的小区,则所述指示信息还指示了不允许用户设备 驻留在所述小区除非所述用户设备在成功驻留在所述小区后随即尝试接入所述小区。
3、 根据权利要求 1所述的装置, 其中, 所述指示信息包含在所述小区的系统信 息中。
4、根据权利要求 3所述的装置,其中,所述系统信息由公共无线资源控制(RRC) 信令承载或者由物理广播信道 (PBCH) 承载。
5、 根据权利要求 4所述的装置, 其中, 所述公共 RRC信令为第一系统信息块 ( SIB1 ) 信令。
6、根据权利要求 1所述的装置, 其中, 所述指示信息由用户设备专用的 RRC信 令承载。
7、 根据权利要求 1所述的装置, 其中, 所述发送单元还用于向所述用户设备发 送失效指示信息,以便所述用户设备根据所述失效指示信息或者根据所述失效指示信 息以及所述用户设备的能力确定所述小区是否为只能用于接入的小区。
8、 一种小区选择装置, 其中, 所述装置包括:
接收单元, 其接收小区的基站发送的指示信息;
确定单元, 其根据所述指示信息确定所述小区是否为只能用于接入的小区。
9、 根据权利要求 8所述的装置, 其中, 所述确定单元在所述指示信息指示了所 述小区为只能用于接入的小区时, 确定所述小区为只能用于接入的小区。
10、根据权利要求 8所述的装置, 其中, 所述确定单元在所述指示信息指示了所 述小区为只能用于接入的小区时, 根据接收到的所述基站发送的失效指示信息和 /或 自身能力, 确定所述小区是否为只能用于接入的小区。
11、 根据权利要求 10所述的装置, 其中,
如果所述装置所在的用户设备为第一类用户设备,则所述确定单元确定所述小区 为只能用于接入的小区;
如果所述装置所在的用户设备为第二类用户设备,则所述确定单元确定所述小区 为非只能用于接入的小区。
12、根据权利要求 8所述的装置, 其中, 所述确定单元在所述指示信息指示了所 述小区为非只能用于接入的小区时, 确定所述小区为非只能用于接入的小区。
13、 根据权利要求 8所述的装置, 其中, 所述装置还包括:
判断单元,其在所述接收单元在接收所述指示信息时,判断所述装置所在的用户 设备是否正在进行随机接入;
处理单元,其在所述判断单元判断为所述用户设备正在进行随机接入时,将所述 小区作为所述用户设备进行小区重选的候选小区之一。
14、 根据权利要求 13所述的装置, 其中,
所述处理单元还用于在所述判断单元判断为所述用户设备没有进行随机接入时, 存储与所述小区相关的信息。
15、 根据权利要求 14所述的装置, 其中, 与所述小区相关的信息包括所述小区 的小区标识 (ID)、 小区频点、 和 /或小区状态。
16、 根据权利要求 15所述的装置, 其中, 所述小区状态包括所述小区为只能用 于接入的小区。
17、 根据权利要求 14所述的装置, 其中,
所述处理单元还用于在所述用户设备正在进行随机接入,且所述用户设备即将启 动一次小区选择或重选时,将所述小区作为小区选择或重选的候选小区之一,并在进 行小区选择或重选过程中利用存储的所述小区相关的信息对所述候选小区进行比较 和评估。
18、 根据权利要求 8所述的装置, 其中, 所述装置还包括:
接入控制单元,其在所述确定单元确定所述小区为只能用于接入的小区时,在所 述装置所在的用户设备驻留到所述小区后启动计时器; 并在所述计时器的计时时间 内,在所述用户设备没有启动在所述小区的随机接入时,在所述计时器超时后进行小 区选择或重选。
19、 一种通信系统, 所述通信系统包括基站和用户设备, 其中,
所述基站被配置为向用户设备发送指示信息,所述指示信息指示了所述基站覆盖 的小区是否为只能用于接入的小区;
所述用户设备被配置为接收所述指示信息,根据所述指示信息确定所述小区是否 为只能用于接入的小区。
PCT/CN2014/071361 2014-01-24 2014-01-24 小区选择方法、装置和通信系统 Ceased WO2015109523A1 (zh)

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