WO2015106543A1 - Procédé et dispositif de gestion de cellules - Google Patents

Procédé et dispositif de gestion de cellules Download PDF

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Publication number
WO2015106543A1
WO2015106543A1 PCT/CN2014/080762 CN2014080762W WO2015106543A1 WO 2015106543 A1 WO2015106543 A1 WO 2015106543A1 CN 2014080762 W CN2014080762 W CN 2014080762W WO 2015106543 A1 WO2015106543 A1 WO 2015106543A1
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Prior art keywords
cell
configuration
state
processing method
processing device
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PCT/CN2014/080762
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English (en)
Chinese (zh)
Inventor
莫林梅
赵亚军
徐汉青
高永红
斯维德曼⋅帕特里克
陈玉芹
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中兴通讯股份有限公司
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Publication of WO2015106543A1 publication Critical patent/WO2015106543A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present invention relates to the field of mobile communications technologies, and in particular, to a cell processing method and apparatus. Background technique
  • the Small Cell technology uses low-power wireless access nodes to extend the coverage of the Macro Cell, divert the growing data traffic of the macro cell, and improve the efficiency of the use of radio spectrum resources.
  • the Advanced Long Term Evolution (LTE-Advanced) system uses Small Cell technology to increase network capacity.
  • the Small Cell deployment scenario of the LTE network may be composed of two levels: a macro cell and a small cell.
  • the LTE system is an interference-limited system, and there is a complex interference relationship between the macro cell and the small cell, and between the small cell and the small cell. Each cell is dynamically scheduled to serve the terminal in the cell. In addition, as the user terminal (UE) moves, the UE will move in and out of the small cell, and the load and interference of the Small Cell system will show significant fluctuations.
  • the small cell adaptive switching mechanism is an effective interference coordination method in the Small Cell scenario. The basic idea is to adaptively turn on and off some small cells with low load to reduce inter-cell interference.
  • the active small cell normally transmits the data channel and the common channel; the sleeping small cell closes the data channel and part of the common channel.
  • the closed cell is also called a dormant cell.
  • a serving cell of a certain UE is an on/off (on/off) enabled small cell, and a non-dual-connection scenario or a carrier aggregation (CA) scenario, it is an independent cell (standalone cell).
  • the small cell is off (off)
  • the UE that normally camps on the small cell needs to be switched out first.
  • the UE temporarily has no data service but is still switched to the neighboring cell; when the data service of the UE arrives, according to the measurement result of the UE, the off small cell may still be selected as the best.
  • Service area That is, the UE may trigger the activation of the small cell to provide services for itself, and switch back. After the service ends, the small cell may be closed again, and the UE will be switched out again. That may cause ping-pong effects and frequent switching.
  • LTE supports Discontinuous Transmission (DTX) and Discontinuous Reception (DRX) to achieve energy saving.
  • the DTX cell transmits a control signal such as a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a cell-specific reference signal (CRS), and a cell-specific reference signal (CRS) on a specific period;
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • CRS cell-specific reference signal
  • CRS cell-specific reference signal
  • CRS cell-specific reference signal
  • CRS cell-specific reference signal
  • the existing DTX/DRX mechanism may be partially used, but still facing how to close the small cell and how to open, In order to provide services for the UE and other issues.
  • the existing mechanism does not provide a corresponding solution.
  • the embodiments of the present invention provide a cell processing method and apparatus.
  • An embodiment of the present invention provides a cell processing method, where the method includes:
  • the user terminal UE to which the cell belongs does not migrate to other cells, and maintains a constant association with the cell.
  • the method further includes:
  • a cell supporting adaptive on/off allows a connected state UE that has no traffic temporarily to camp on the own cell.
  • the method further includes:
  • the method further includes:
  • the connected UE is in a normal state or configured to receive a DRX state discontinuously.
  • the method further includes:
  • the UE served by the cell keeps RRC connection with the radio resource control of the cell, and does not switch to another cell;
  • the cell is a secondary cell SCell, the cell remains as the SCell of the UE;
  • the base station of the cell remains as the secondary base station/secondary cell set of the UE, and the cell is not deleted by the primary base station MeNB to which the UE belongs, and may remain in an active state or a deactivated state.
  • the method further includes:
  • cell open and/or close information is sent by the cell to the UE through the control channel.
  • one piece of control information of the control channel is simultaneously received by some or all UEs in the cell.
  • the control channel is a control channel transmitted by a common search space of the control domain.
  • the control channel is DCI 3 and/or DCI 3a.
  • the radio network temporary identifier RNTI used by the control channel is an RNTI common to the lower part of the cell or common to all UEs.
  • the NTI common to some or all UEs in the cell that is used by the control channel is one of the following RNTIs:
  • SI-RNTI System message radio network temporary identifier SI-RNTI
  • P-RNTI paging radio network temporary identifier
  • the transmission power control radio network temporarily identifies the TPC-RNTI, the newly introduced RNTI.
  • the method further includes: the cell that is to be shut down performs discontinuous reception DRX configuration on the connected UE that has no service in the cell.
  • the method further includes: obtaining, by each cell, a DS signal configuration of the cell in the following manner:
  • Each cell independently selects the DS configuration
  • Each cell selects the DS configuration autonomously, and notifies the main control unit of the selected DS configuration, and accepts the modification of the selected DS configuration by the main control unit;
  • Each cell independently selects the DS configuration, and notifies the selected DS configuration to other related cells, and performs multi-cell coordination to tamper with the selected DS configuration;
  • Each cell independently selects a DS configuration, and notifies the main control unit and other related cells to the selected DS configuration, and accepts the modification of the selected DS configuration by the main control unit;
  • the DS configuration includes: a DS sending period, a DS sending power, and a time-frequency resource occupied by the DS sending.
  • the method further includes: configuring, by the cell to periodically send, in a dormant state, a transmission configuration of a reference signal other than the DS in a dormant state, where the sending configuration includes a sending period, an occupied time-frequency resource, and a sequence resource; After the cell enters the sleep state, the reference signal is sent according to the sending configuration;
  • the reference signal includes a primary synchronization signal PSS, a secondary synchronization signal SSS, a cell-specific reference signal CRS, and a channel state indication reference signal CSI-RS.
  • the method further includes: the cell notifying, to the camping UE under the cell, a sending configuration of the reference signal other than the DS in a dormant state.
  • the DRX configuration includes: a DRX cycle, an activation period, and a sleep period;
  • the DRX cycle needs to meet the following conditions:
  • the DRX cycle has a common number with the DS transmission cycle;
  • the DRX cycle and the reference signal other than the DS have a common number of transmission periods in the sleep state.
  • the performing data transmission management on the connected UE in the cell includes performing downlink data transmission management of the connected UE in the cell according to the following manner:
  • the connected state UE in the cell is notified of related information about the cell opening by using a radio resource control RRC signaling or a physical downlink control channel PDCCH command, including a cell open indication and a cell open time. And the cell system parameter update information; opening the cell immediately after notifying the connected state UE, or delaying opening the cell after notifying the UE;
  • the channel state indication reference signal CSI-S is immediately started to be transmitted; if the cell is delayed to be turned on, the CSI-RS is transmitted simultaneously with the notification to the connected state UE, or at the next activation period.
  • the CSI-RS is transmitted, or a CSI-RS is transmitted at a time between the time when the connected UE is notified and the cell open time.
  • the PDCCH instruction includes a downlink control information DCI format 1A or a new DCI, and the notification manner is:
  • the connected UE in the dormant cell receives the PDCCH sent by the cell, that is, implicitly indicates that the cell is already open, and downlink data arrives, and the UE needs to prepare to receive downlink data;
  • a bit indicating the cell opening and a bit indicating the cell opening time are added, indicating that the cell is about to be opened, and the opening time;
  • the PDCCH carries a new DCI
  • the DCI includes a bit indicating that the cell is open, and a bit indicating a cell open time, indicating that the cell is about to be turned on, and the time of opening.
  • the method further includes: allocating a fixed preamble to the UE, and releasing the fixed allocated preamble after the cell is opened.
  • the performing data transmission management on the connected UE in the cell includes performing uplink data transmission management of the connected UE in the cell according to the following manner: After receiving the service request initiated by the connected UE, receiving the uplink data of the connected UE; or, after receiving the random access request initiated by the connected UE, completing the random state of the connected UE Accessing, then receiving uplink data of the connected UE.
  • the mobility management of the connected UE in the cell includes:
  • the uplink receiving of the cell in the dormant state is always on, or is only turned on at a predetermined reporting time, to receive the measurement result reported by the connected state UE; according to the measurement result reported by the UE in the connected state, during the activation period Performing handover of the connected state UE.
  • the performing paging processing on the idle state UE in the cell includes:
  • the cell that controls the dormant state initiates paging to the idle state UE when receiving paging information of the idle state UE sent by another cell; or, controls the dormant state.
  • the cell starts an activation process of the cell in a dormant state, and the activated cell provides downlink data for the idle state UE. service.
  • the embodiment of the invention further provides a cell processing device, the device comprising:
  • the resident processing module is configured to control, in the process of performing the opening and closing operation of the cell, the user terminal UE to which the cell belongs does not migrate to other cells, and maintain a constant association with the cell.
  • the camping processing module is further configured to allow a connected state UE that has no service temporarily to camp in the cell in a cell that supports adaptive opening/closing.
  • the device further comprises:
  • a management module configured to perform data transmission management and/or mobility management on the connected UE in the cell when the cell enters a dormant state.
  • the management module is further configured to perform paging processing on the idle state UE in the cell when the cell enters a dormant state.
  • the connected UE is in a normal state or configured to receive a DRX state discontinuously.
  • the resident processing module is further configured to:
  • the UE controlling the cell service maintains wireless with the cell
  • the resource controls the RRC connection and does not switch to other cells
  • the cell is a secondary cell SCell, the cell remains as the SCell of the UE;
  • the base station of the cell remains as the secondary base station/secondary cell set of the UE, and the cell is not deleted by the primary base station MeNB to which the UE belongs, and may remain in an active state or a deactivated state.
  • the camping processing module is further configured to: when the cell is a single cell and/or a spectrum aggregated secondary cell and/or a dual-connected secondary base station, the cell opening and/or closing information is used by the cell.
  • the UE is sent through the control channel.
  • one piece of control information of the control channel is simultaneously received by some or all UEs in the cell.
  • the control channel is a control channel transmitted by a common search space of the control domain.
  • the control channel is DCI 3 and/or DCI 3a.
  • the radio network temporary identifier RNTI used by the control channel is an RNTI common to the lower part of the cell or common to all UEs.
  • the RNTI common to some or all of the UEs in the cell to which the control channel is used is one of the following RNTIs: SI-RNTI, TPC-NTK P-NTL newly introduced RNTI.
  • the method further includes: a configuration module, configured to perform discontinuous reception DRX configuration on the UE that is ready to be closed to the connected UE that has no service in the current cell.
  • the configuration module is further configured to acquire, for each cell, a discovery signal DS configuration of the local cell by using the following manner:
  • the DS configuration includes: a DS sending period, a DS sending power, and a time-frequency resource occupied by the DS sending.
  • the configuration module is further configured to: configured to periodically send, in a dormant state, a transmission configuration of a reference signal other than the DS in a dormant state, where the sending configuration includes a sending period, an occupied time-frequency resource, and a sequence. After the cell enters the sleep state, the reference signal is sent according to the sending configuration;
  • the reference signal includes a primary synchronization signal PSS, a secondary synchronization signal SSS, a cell-specific reference signal CRS, and a channel state indication reference signal CSI-RS.
  • the apparatus further includes a notification module, configured to notify, to the resident UE under the cell, a transmission configuration of the reference signal other than the DS in a dormant state.
  • the DRX configuration includes: a DRX cycle, an activation period, and a sleep period;
  • the DRX cycle needs to meet the following conditions:
  • the DRX period and the DS transmission period have a common number
  • the transmission period of the DRX period and the reference signal other than the DS in the sleep state has a common number.
  • the performing data transmission management on the connected UE in the cell includes performing downlink data transmission management of the connected UE in the cell according to the following manner:
  • the connected state UE in the cell is notified of related information about the cell opening by using a radio resource control RRC signaling or a physical downlink control channel PDCCH command, including a cell open indication and a cell open time. And the cell system parameter update information; opening the cell immediately after notifying the connected state UE, or delaying opening the cell after notifying the UE;
  • the channel state indication reference signal is immediately sent.
  • CSI-RS if the cell is delayed to be turned on, transmitting a CSI-RS while notifying the connected state UE, or starting to transmit a CSI-RS in a next active period, or selecting a time to notify the connected state UE
  • the CSI-RS is transmitted at a time between the cell opening time and the cell.
  • the PDCCH instruction includes a downlink control information DCI format 1A or a new DCI, and the notification manner is:
  • the connected UE in the dormant cell receives the PDCCH sent by the cell, that is, implicitly indicates that the cell is already open, and downlink data arrives, and the UE needs to prepare to receive downlink data;
  • a bit indicating the cell opening and a bit indicating the cell opening time are added, indicating that the cell is about to be opened, and the opening time.
  • the PDCCH carries a new DCI
  • the DCI includes a bit indicating that the cell is open, and a bit indicating the cell open time, indicating that the cell is about to be turned on, and the time of opening.
  • the management module is further configured to allocate a fixed preamble to the UE, and release the fixed allocated preamble after the cell is opened.
  • the performing data transmission management on the connected UE in the cell includes performing uplink data transmission management of the connected UE in the cell according to the following manner:
  • the mobility management of the connected UEs in the cell includes:
  • the uplink receiving of the cell in the dormant state is always on, or is only turned on at a predetermined reporting time, to receive the measurement result reported by the connected state UE; according to the measurement result reported by the UE in the connected state, during the activation period Performing handover of the connected state UE.
  • the performing paging processing on the idle state UE in the cell includes:
  • the cell that controls the dormant state initiates paging to the idle state UE when receiving paging information of the idle state UE sent by another cell; or
  • the cell that controls the dormant state starts the activation process of the cell in the dormant state when receiving the paging information of the idle state UE sent by the other cell, and the activated cell is the idle state UE.
  • the embodiment of the present invention further provides a computer readable storage medium, the storage medium comprising a set of computer executable instructions, the instructions being used to perform the cell processing method according to the embodiment of the present invention.
  • a method and a device for processing a cell configured to allocate a pattern of coordinated signal discovery signals of different cells, to avoid interference between discovery signals of each cell, and to propose a connected state UE that is not switched out when the cell is closed. And the processing method of the Idle state UE.
  • the discovery signals are mutually interfered, and unnecessary frequent handover of the UE is avoided, thereby improving system efficiency.
  • FIG. 1 is a flowchart of a cell processing method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a relationship between a DS period and a D X period according to an embodiment of the present invention
  • FIG. 3 is a detailed flowchart of a cell processing method according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of an activation period when mobility management is performed on a connected UE under a cell according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a cell processing apparatus according to an embodiment of the present invention. detailed description
  • a method for processing a cell according to an embodiment of the present invention includes: in a process in which a cell performs an open and close operation, a user terminal UE to which the cell belongs does not migrate to another cell, and maintains a constant association with the cell.
  • the execution entity of the method is a base station of a cell, and a method Includes:
  • Step 101 The cell supporting the adaptive on/off allows the connected state UE that has no service temporarily to camp on the local cell.
  • Step 103 Perform data transmission management and/or mobility management on the connected UE in the cell when the cell enters a dormant state.
  • the connected UE is in a normal state or configured to receive a DRX state discontinuously.
  • the method also includes:
  • the UE served by the cell maintains a radio resource control (RRC) connection with the cell, and does not switch to another cell;
  • RRC radio resource control
  • the cell may remain as the SCell of the UE.
  • the SCell may remain in an active state or may be configured as a deactivated state; or
  • the base station of the cell remains as a secondary base station/secondary cell set (SeNB/SCG) of the UE, and the cell may not be deleted by the primary base station MeNB to which the UE belongs, It remains active and can also be deactivated.
  • SeNB/SCG secondary base station/secondary cell set
  • the system notifies the UE of information about the on/off operation of the cell, and the information may include an on/off state, a discontinuous transmission configuration information of the cell, and a discovery signal (DS) pattern;
  • the related information of the /off operation may be transmitted by the serving cell, the macro cell, and a designated cell of the UE.
  • the cell discontinuous transmission configuration information may include: CRS transmission information, control channel transmission information (PDCCH and/or ePDCCH), cell discovery signal information, discontinuous transmission pattern, and the like; wherein the CRS may be used for downlink synchronization tracking and control channels. Demodulation;
  • the cell discovery signal may appear in the discontinuous transmission subframe or in other subframes, and may be used for the discovery and measurement of the cell by the neighboring cell UE; the control channel may be used to send the cell on/off. status information (For example, turn on the off state, turn on the off time).
  • the cell When the cell is in a discontinuous state, it is sent based on the discontinuous state configuration information; the UE performs measurement and detection based on the discontinuous state configuration information. details as follows:
  • the cell When in the DTX_ON state, the cell may send one or more of the following signals:
  • the UE measures the RS signal sent by the cell, and detects possible PDCCH and/or ePDCCH.
  • the PDCCH and/or the ePDCCH are transmitted by the cell;
  • the cell is a SCell, and the PDCCH and/or the ePDCCH are sent by the cell, or may be sent by the PCell of the UE;
  • the cell to which the cell belongs is the SeNB/SCG;
  • the PDCCH and/or the ePDCCH are sent by the cell, or may be sent by the PCell of the UE, or sent by the PCell of the SCG, or by the MeNB;
  • the cell will carry the status information that is sent to the UE by using the PDCCH and/or the ePDCCH sent by the DTX-ON time, and may also include the time information of the opening and the uplink random access information; The purpose is to let the UE send an uplink random access signal for uplink synchronization.
  • the UE maintains an RRC connection with the cell, and does not switch to another cell.
  • the UE measures the DS signal in the cell OFF state, and the measured RSRP and/or RSRQ measurement results may be After the cell is opened, the cell is opened to the cell, and the cell opening information can be used as a trigger for the UE to perform RRM measurement;
  • the cell is an SCell
  • the UE measures the DS signal in the cell OFF state, and the measured result of the measured RSRP and/or RSRQ can be reported to the primary cell (PCell) of the UE. Can be reported to the SCell after the SCell is opened;
  • the cell belongs to the SeNB/SCG, and the UE measures the DS signal in the cell OFF state, and measures the measured results such as RSRP and/or RSRQ, if the cell For the PCell of the SCG, the MeNB/MCG of the UE may be sent to the SeNB, or may be reported to the SeNB after being opened by the SeNB; if the SCell is the SCell of the SCG, the MeNB/MCG may be reported to the UE, or may be sent to the UE.
  • the PCell of the SCG may also be sent to the cell after the cell is opened.
  • the method further includes: when the cell is a cell of a single cell and/or a spectrum aggregated secondary cell and/or a dual-connected secondary base station, the cell opening and/or closing information is sent by the cell to the UE through a control channel.
  • the control channel may be a control channel for transmission of a common search space of a control domain.
  • the control channel can be DCI 3 and / or DCI 3a.
  • the Radio Network Temporary Identifier (RNTI) used by the control channel is an RNTI common to some or all UEs in the cell.
  • the RNTI common to some or all of the UEs in the cell to which the control channel is used is one of the following RNTIs: System Message RNTI (SI-RNTI, System information), Paging RNTI (P-NTI, Paging RNTI), Transmission Power Control RNTI (TPC-RNTI, Transmission Power Control-NTI) power control RNTI, or newly introduced RNTI.
  • SI-RNTI System Message RNTI
  • P-NTI Paging RNTI
  • TPC-RNTI Transmission Power Control RNTI
  • Transmission Power Control-NTI Transmission Power Control-NTI
  • the method may further include the step 102, where the cell that is ready to be closed performs D X configuration on the connected UE that has no service in the cell.
  • step 103 is: performing data transmission management and/or mobility management on the connected UE in the cell according to the DRX configuration when the cell enters a dormant state.
  • the method before the cell enters a dormant state, the method further includes: acquiring, by each cell, a discovery signal DS configuration of the local cell by:
  • Each cell independently selects the DS configuration
  • Each cell independently selects a DS configuration, and notifies the selected DS configuration to the main control unit, accepting the modification of the selected DS configuration by the main control unit; or Each cell independently selects the DS configuration, and notifies the selected DS configuration to other related cells, and performs multi-cell coordination to tamper with the selected DS configuration; or
  • Each cell independently selects a DS configuration, and notifies the main control unit and other related cells to the selected DS configuration, and accepts the modification of the selected DS configuration by the main control unit;
  • the DS configuration includes: a DS sending period, a DS sending power, and a time-frequency resource occupied by the DS sending; the main control unit may be a macro cell, or each of the related small cells.
  • the method further includes: configuring, by the cell to periodically send, in a dormant state, a transmission configuration of a reference signal other than the DS in a dormant state, where the sending configuration includes a sending period, an occupied time-frequency resource, and a sequence resource; After the cell enters the sleep state, the reference signal is sent according to the sending configuration;
  • the reference signal includes PSS, SSS, CRS, CSI-S 0
  • the auxiliary measurement includes: the UE performs synchronous measurement and tracking based on the periodically transmitted reference signal, and the UE may also perform RRM measurement based on the reference signal, as a DS measurement. supplement.
  • the method further includes: the cell notifying the camping UE under the cell of the transmission configuration of the reference signal other than the DS in a dormant state.
  • the DX configuration is performed on all the connected UEs that have no service in the same cell, and the DRX configuration includes: a DRX cycle, an activation period, and a dormancy period.
  • the DRX period configuration of the UE needs to be met:
  • the DRX period and the DS period have a common number to ensure that the UE's activator can receive the discovery signal.
  • the specific includes:
  • the DS period is the same as the DRX period
  • the DS period is a multiple of the DRX period
  • the DS period is a divisor of the DRX period
  • the DS period is different from the DRX period, but there is a common divisor.
  • the DRX cycle configuration of the UE also needs to be satisfied:
  • the DX cycle has a common number with other reference signal cycles to ensure that the UE's activator can receive other reference signals for synchronization maintenance, synchronization tracking, measurement assistance, and the like. Specifically include:
  • performing data transmission management on the connected UE in the cell includes performing downlink data transmission management of the connected UE in the cell according to the following manner:
  • the connected state UE in the cell is notified of the information about the cell opening by using a radio resource control (RRC) signaling or a physical downlink control channel (PDCCH) command, which may include the cell opening. Indication, cell open time, and cell system parameter update information, etc.; immediately opening the cell while notifying the connected state UE, or delaying opening the cell after notifying the UE;
  • RRC radio resource control
  • PDCCH physical downlink control channel
  • the channel state indication reference signal (CSI-S) is immediately started to be transmitted; if the cell is delayed to be turned on, the CSI-RS is transmitted while being notified to the connected state UE, or is activated next The period starts to transmit the CSI-RS, or selects to transmit the CSI-RS at a time between the time when the connected UE is notified and the cell open time.
  • CSI-S channel state indication reference signal
  • the PDCCH order includes a downlink control information DCI format 1A or a new DCI, and the notification manner is:
  • the connected UE in the dormant cell receives the PDCCH sent by the cell, that is, implicitly indicates that the cell is already open, and downlink data arrives, and the UE needs to prepare to receive downlink data;
  • the bit indicating the cell opening and the bit indicating the cell open time are explicitly added, and the cell is about to be turned on, and the time of opening is explicitly indicated.
  • the PDCCH carries a new DCI, where the DCI includes a bit indicating that the cell is open, and The bit indicating the cell open time clearly indicates that the cell is about to be turned on, and the time of opening.
  • the method further includes: allocating a fixed preamble to the UE, and releasing the fixed allocated preamble after the cell is turned on.
  • the performing data transmission management on the connected UE in the cell includes performing uplink data transmission management of the connected UE in the cell according to the following manner:
  • the performing mobility management on the connected UE in the cell includes: controlling uplink reception of the cell in a dormant state to be always on, or only at a predetermined reporting time (eg, the DRX configuration)
  • the activation period is opened to receive the measurement result reported by the connected state UE; and the handover of the connected state UE is performed during the activation period according to the measurement result reported by the connected state UE.
  • the performing paging processing on the idle state UE in the cell includes: when the cell enters a dormant state, the cell that controls the dormant state receives the idle state sent by another cell.
  • the paging information of the UE is used, the paging is initiated to the idle state UE; or the cell controlling the dormant state starts the paging information for the idle state UE when the other cell sends the paging information for the idle state UE.
  • the activation process of the cell the activated cell provides downlink data service for the idle state UE.
  • Step 301 Each cell coordinates configuration discovery signal transmission pattern.
  • each cell should coordinate the configuration of the signal pattern (DS pattern), which can be configured as follows:
  • each cell independently selects a discovery signal transmission pattern, and notifies the main control unit/other cell of the selected discovery signal transmission pattern, and the main control unit can accept cell selection, or reallocation, or It is required to modify the existing selection of the cell, small-area coordination (including dummy configuration, low-power transmission, etc.); each cell can be freely selected in all DS patterns, or can be selected in a resource pool reserved for the cell;
  • the coordinated cell set includes the cell d, C 2 C N , and the coordinated cell set has a cell M l 7 cell coverage under the user terminal;
  • the available DS configuration set ie, the set of discovery signal transmission patterns
  • the DS configuration may include information such as a DS transmission period, a DS transmission power, and a time-frequency resource occupied by the DS transmission.
  • Each cell may notify the main control unit of the DS configuration selected by the cell, and the main control unit may be one of the cells d and C 2 C N that need to cooperate, or may be the cell M l Q other than the coordinated cell set. After receiving the DS configuration of each cell, the main control unit needs to check whether the selection of each cell is appropriate and perform corresponding processing.
  • the DS configuration of a certain cell has less interference to other cells, for example, the DS transmission power is less than a predetermined value, and/or the number of REs colliding with other cells DS is less than a predetermined value, and/or the sequence resources used. Different from other cells, the DS configuration selected by the cell can be directly accepted. If the DS configuration of a cell has a large interference to other cells, for example, the DS transmission power is greater than a predetermined value TP1, and/or collides with other cells DS.
  • the DS configuration of the cell may be modified; for example, the modification may be recommended/ Requiring the cell to reduce the DS transmit power value, and/or adjusting the time-frequency resource used by the cell DS for transmission, and/or replacing the used sequence resource;
  • the DS configuration of a cell is too large for other cells, for example, the DS transmission power is greater than a predetermined value TP2, and/or the number of REs colliding with other cells DS is greater than a predetermined value RE2, and/or the sequence used. If the resource is the same as other cells, the cell may be rejected to select the DS configuration; the DS configuration may be re-selected by the cell, or the control unit may directly allocate an appropriate DS configuration to the cell to avoid re-re-declaration of the cell. Multiple handshake delays.
  • the main control unit uniformly allocates the discovery signal transmission pattern, and the main control unit needs to be integrated. Taking into account the historical service situation of each cell, the service situation of the area in which the cell is located is the DS pattern of the cell.
  • the DS transmit power of the cell may be appropriately increased, so that the cell is more easily discovered and selected by the UE.
  • the time-frequency resources occupied by DSs in each cell should be staggered as much as possible, and the DS sequence resources should be staggered as much as possible.
  • the DS configuration of each cell may be sent to other cells, so that other cells may perform interference coordination.
  • mode 1 and mode 2 may also be used in combination, that is, the centralized allocation of the main control unit and the autonomous selection of each cell are combined.
  • Step 302 Perform D X configuration on the connected UE that has no service temporarily.
  • the D X configuration is performed on the UE, and the configured content may include a DRX cycle, an On Duration, and an Opportunity for DRX.
  • the UE enters the DRX state according to the DRX configuration.
  • the UE monitors and receives the physical downlink control channel (PDCCH, Physical Downlink Control Channel); during the "Opportunity for DRX" time (sleep period)
  • the UE does not receive data of the downlink channel to save power consumption.
  • All UEs in the same cell should perform the same DRX configuration, which facilitates the cell to perform a single DTX transmission accordingly.
  • Step 303 The cell is shut down according to the network condition, and enters an OFF/DTX state.
  • Each cell can decide whether to perform switching according to factors such as load conditions, UE association status, and presence or absence of data packet arrival. Make sure to close after closing.
  • the following measures are performed on the UEs in the cell: For the UEs that currently have services, the UEs need to be switched to other cells as soon as possible. For the UEs that have no data service, the UE may choose to switch to other cells or not. That is, the radio resource control (RRC, Radio Resource Control) connection of these UEs remains in the cell. Before the cell is closed, it is necessary to notify those UEs that are not switched out and still camp in the cell. The cell is about to be shut down and enters OFF/DTX. status.
  • RRC Radio Resource Control
  • the cell entering the OFF/DTX state transmits the discovery signal according to the DS period, and further, the PDCCH may be transmitted according to the DRX Cycle of the UE as needed.
  • Step 304A For the connected UE that has not been switched out, perform downlink data transmission management according to the following method:
  • the UE For the downlink, in the initial stage of cell closure, the UE has no data.
  • the cell can wake up during the activation period of the UE and send reference signals such as PSS/SSS/CRS.
  • the UE can use these signals for downlink synchronization detection and keep synchronization with the cell.
  • the cell needs to be activated to provide services to the UE.
  • the cell notifies the relevant information of the cell opening during the activation period of the UE.
  • the manner in which the cell is opened may be immediately opened, that is, the cell is immediately opened when the UE is notified; or the delay may be opened, that is, the related information of the UE cell is opened during the activation period of the UE, and the cell is opened after waiting for the predetermined time.
  • the manner of notifying the related information opened by the UE cell may be:
  • the cell may notify the UE that the cell is about to be opened by RRC signaling, and notify the UE of the open time information of the cell; the notification message may explicitly include the time information of the cell opening, or implicitly include the time information of the opening, that is, the UE at the time n
  • the open notification message is received and then opened at the time n+k after the predetermined k time units.
  • the cell may also notify the UE cell to open the information by sending a PDCCH order (PDCCH instruction) to the UE.
  • PDCCH instruction a PDCCH order
  • the cell sends a PDCCH order to the UE, which includes the DCI format 1 A or the new DCI, and allocates a Physical Random Access Channel (PRACH) preamble for the UE, and triggers the UE to use the preamble for non-competition. Random access.
  • PDCCH order PDCCH instruction
  • PRACH Physical Random Access Channel
  • the channel state indication reference signal (CSI-RS, Channel State Indication Reference Signal) is immediately sent for the UE to perform channel quality indicator (CQI, Channel Quality Indicator)/precoding matrix indication ( PMI, Channel information measurement such as Precoding Matrix Indicator) / Rank Indication (I, Rank Indication).
  • CQI Channel Quality Indicator
  • PMI Precoding matrix indication
  • I Rank Indication
  • the time when the cell starts to send the CSI-RS also needs to be notified to the UE, and the cell may notify the UE when transmitting RRC signaling or PDCCH information to the UE.
  • the UE receives the related information about the cell, whether to terminate the DRX state depends on the service type. If the service type of the UE is a continuous service, the DRX state should be ended. If the service type of the UE is a non-continuous service, the DRX state can be maintained.
  • the UE in the OFF/DTX cell receives the cell PDCCH, that is, implicitly indicates that the cell has been opened, and downlink data arrives, and the UE needs to prepare to receive downlink data.
  • the bit indicating the cell opening and the bit indicating the cell opening time may be added.
  • the UE After receiving the PDCCH, the UE initiates a random access procedure and prepares to receive downlink data sent to itself after successful access.
  • Step 304B For the connected UE that has not been switched out, perform uplink data transmission management as follows:
  • the connected UE For the uplink, the connected UE has an RRC connection. Once an uplink packet arrives, the UE can perform the following operations:
  • the UE may send a buffer status report (BSR, Buffer Status Report) to initiate a service request.
  • BSR buffer Status Report
  • the uplink out-of-synchronization situation may occur, and the UE needs to initiate a random access of the competition.
  • the random access to the competition is completed in four steps:
  • the UE sends the preamble to the base station of the cell
  • the base station of the cell sends a random access response to the UE
  • the UE sends the C-RNTI control unit and the BSR control unit to the base station of the cell.
  • the base station of the cell sends a resolution to the UE.
  • the cell preamble resource in the OFF/DTX state is idle, and the number of possible DRX UEs is not large.
  • the PDCCH order may be periodically sent by the base station during the activation period of the UE, and the UE is triggered to send the non-contention RACH to maintain Uplink synchronization reduces the waiting time after the arrival of upstream data.
  • the UE may also be allocated a fixed preamble, and after the cell is opened, the fixed allocated preamble needs to be released. With this scheme, when there is uplink data arriving, the UE can directly send the BSR.
  • Step 305A For the Idle state UE that is not switched out, the called method is as follows: For the case where the Idle UE is called, there are two modes of operation:
  • the off-state cell receives the paging information sent by the other cell to the idle UE of the local cell, and can initiate paging to the idle UE actively even in the off state.
  • the idle UE After receiving the paging information, the idle UE first performs UE identity (ID) matching. If the UE ID list included in the paging message includes its own UE ID, it can be determined that the paging message is calling itself;
  • ID UE identity
  • the idle UE receiving the paging information needs to perform the paging identity (Paging ID) judgment. If the paging ID is an International Mobile Subscriber Identification Number (IMSI), it indicates that the paging is abnormal. Call, used for error recovery on the network side. In this case, the terminal needs to perform an attach procedure again. If the paging message indicates that the Paging ID is a temporary mobile subscriber identity of the system architecture evolution (S-TMSI, System Architecture Evolution) -Temporary Mobile Subscriber Identification), the bay 1 j indicates that the paging is a normal service call, and the Idle UE needs the off cell to further provide downlink data service for itself. Therefore, it is necessary to send an uplink PRACH message and activate the off cell to be the Idle UE. A Physical Downlink Shared Channel (PDSCH) service is provided.
  • IMSI International Mobile Subscriber Identification Number
  • PDSCH Physical Downlink Shared Channel
  • the off-state cell when the off-state cell receives the paging information sent by the other cell to the idle UE of the local cell, it considers that this is a trigger event for activating the local cell, starts the activation process, and switches to the active state to provide the downlink data service for the UE.
  • Step 305B For the Idle state UE that has not been switched out, initiate a call as follows: For the case where the Idle UE needs to initiate a call, the following operations can be performed:
  • the Idle UE When the Idle UE needs to initiate a call, it initiates a random access request to the off cell, and the off cell responds to the PRACH message sent by the Idle UE, and sends a RACH Response to the Idle UE, implicitly indicating that the cell has been opened.
  • the status of the Idle UE is updated to Active (Active), and a call can be initiated.
  • the off cell can be switched to an on state according to the service requirements of the UE, taking into account other network factors, in order to provide services for the UE.
  • the Idle UE sends a RACH message. If the dormant cell decides to open after receiving the RACH message sent by the UE, the cell activation process is initiated, and the activated cell may send a PRACH response to the UE. If the dormant cell cannot be opened, the PRACH is not sent to the Idle UE. Respond
  • the UE may receive the uplink data of the UE if it receives the RACH response sent by the base station, that is, implicitly indicating that the cell is already open; the Idle UE may update its status to the active state (Active) and initiate paging;
  • the PRACH message may be resent until the PRACH response is received; if the UE does not receive the PRACH response after repeatedly transmitting the predetermined number of PRACH messages, it shall initiate Cell reselection.
  • Step 306 For the connected UE that has not been switched out, mobility management may be performed as follows:
  • the connected state UE may have a handover requirement, so it is necessary to perform radio resource management (RRM, Radio Resource Management) measurement on the cell and the neighboring cell.
  • RRM Radio Resource Management
  • the uplink reception of the OFF/DTX cell may be always on, or may be opened only during the DRX activation period, and the UE reports the measurement result during the DRX activation period.
  • the UE reports the measurement result during the DRX activation period.
  • the DRX activation period has a certain width and can complete each report.
  • the frequency of the D X activation period is sufficient to meet the UE reporting requirements.
  • the UE needs to perform handover, and the following schemes are available:
  • the handover is completed during the DRX activation period, because the time required to complete the handover is longer than the time required for the measurement result to be reported.
  • both the base station and the UE know the handover behavior, so as shown in FIG. 4, it is possible to:
  • the off cell can be opened, and the handover process is completed.
  • the embodiment of the present invention further provides a cell processing device, as shown in FIG. 5, including:
  • the camping processing module 10 is configured to control, when the cell performs the open and close operation, the user terminal UE to which the cell belongs does not migrate to other cells, and maintain the same association with the cell.
  • the camping processing module 10 is further configured to allow a connected state UE that temporarily has no service to camp in the cell in a cell that supports adaptive on/off;
  • the management module 30 is configured to perform data transmission management and/or mobility management on the connected UEs in the cell when the cell enters a dormant state.
  • the management module 30 is further configured to perform paging processing on the idle UE in the cell when the cell enters a dormant state.
  • the connected state UE is in a normal state or configured to discontinuously receive a DRX state.
  • the resident processing module 10 is also configured to
  • the UE controlling the cell service maintains a radio resource control RRC connection with the cell, and does not switch to another cell;
  • the cell is a secondary cell SCell, the cell remains as the SCell of the UE;
  • the base station of the cell remains as a secondary base station/secondary cell set of the UE
  • the cell is not deleted by the primary base station MeNB to which the UE belongs, and may be in an active state or a deactivated state.
  • the camping processing module 10 is further configured to: when the cell is a single cell and/or a spectrum aggregated secondary cell and/or a dual connected secondary base station, the cell opening and/or closing information is passed by the cell through the control channel. Send to the UE.
  • a piece of control information for the control channel is received simultaneously by some or all of the UEs within the cell.
  • the control channel may be a control channel for transmission of a common search space of a control domain.
  • the control channel can be DCI 3 and / or DCI 3a.
  • the RNTI used by the control channel is an NTL common to some or all UEs in the cell.
  • the RNTI common to some or all of the UEs used by the control channel is one of the following RNTIs: SI-NTL TPC-NTL P-NTK newly introduced RNTI.
  • the configuration module 20 is further configured to perform D X configuration on the connected UEs in the cell that are temporarily not in the cell in the cell to be closed.
  • the configuration module 20 is further configured to obtain, for each cell, a discovery signal DS configuration of the local cell by:
  • the DS configuration includes: a DS sending period, a DS sending power, and a time-frequency resource occupied by the DS sending.
  • the configuration module 20 is further configured to: configure, by the cell, to periodically send, in a dormant state, a transmission configuration of a reference signal other than the DS in a dormant state, where the sending configuration includes a sending period and an occupied time. a frequency resource and a sequence resource; after the cell enters a sleep state, the reference signal is sent according to the sending configuration;
  • the reference signal includes PSS, SSS, CRS, and CSI-RS.
  • the notification module 40 is further configured to notify the camping UE under the cell of the sending configuration of the reference signal other than the DS in the dormant state.
  • the DRX configuration includes: a DRX cycle, an activation period, and a sleep period;
  • the DRX period needs to meet the following conditions:
  • the DRX period and the DS transmission period have a common number; and the DRX period and the reference signal other than the DS have a common number of transmission periods in the sleep state.
  • the performing data transmission management on the connected UE in the cell includes performing downlink data transmission management of the connected UE in the cell according to the following manner:
  • the connected state UE in the cell is notified by the RRC signaling or the PDCCH command to the related information that the cell is opened, including a cell open indication, a cell open time, and cell system parameter update information; Opening the cell immediately after notifying the connected state UE, or delaying opening the cell after notifying the UE;
  • the channel state indication reference signal CSI-S is immediately started to be transmitted; if the cell is delayed to be turned on, the CSI-RS is transmitted simultaneously with the notification to the connected state UE, or at the next activation period.
  • the CSI-RS is transmitted, or a CSI-RS is transmitted at a time between the time when the connected UE is notified and the cell open time.
  • the PDCCH instruction includes a DCI format 1A or a new DCI
  • the notification manner is:
  • the connected UE in the dormant cell receives the PDCCH sent by the cell, that is, implicitly indicates that the cell is already open, and downlink data arrives, and the UE needs to prepare to receive downlink data;
  • the PDCCH carries a new DCI
  • the DCI includes a bit indicating that the cell is open, and a bit indicating the cell open time, indicating that the cell is about to be turned on, and the time of opening.
  • the management module 30 is further configured to allocate a fixed preamble to the UE, and release the fixed allocated preamble after the cell is opened.
  • the performing data transmission management on the connected UE in the cell includes performing uplink data transmission management of the connected UE in the cell according to the following manner:
  • Mobility management for connected UEs in a cell including:
  • the uplink receiving of the cell in the dormant state is always on, or is only turned on at a predetermined reporting time, to receive the measurement result reported by the connected state UE; according to the measurement result reported by the UE in the connected state, during the activation period Performing handover of the connected state UE.
  • the paging process for the idle state UE in the cell includes:
  • the cell that controls the dormant state initiates paging to the idle state UE when receiving paging information of the idle state UE sent by another cell; or, controls the dormant state.
  • the cell starts an activation process of the cell in a dormant state, and the activated cell provides downlink data for the idle state UE. service.
  • the apparatus shown in FIG. 5 can be implemented on a base station of a cell.
  • the above-mentioned resident processing module 10, configuration module 20, and management module 30 may be implemented by a central processing unit (CPU) of a cell processing device, a processor (MPU, Micro Processing Unit), and a digital signal processor (DSP, Digital). Signal Processor) or Field-Programmable Gate Array (FPGA); the notification module 40 can be processed by the cell
  • the communication function chip is implemented.
  • the embodiment of the present invention further provides a computer readable storage medium, the storage medium comprising a set of computer executable instructions, the instructions being used to perform the cell processing method according to the embodiment of the present invention.
  • the embodiment of the present invention configures different cell coordination configuration discovery signal transmission patterns to avoid interference between discovery signals of each cell; and proposes processing of connected UEs and Idle state UEs that are not switched out when the cell is closed. method.
  • the discovery signals are mutually interfered, and unnecessary frequent handover of the UE is avoided, thereby improving system efficiency.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment of a combination of software and hardware. Moreover, the invention can be embodied in the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device. Having a series of operational steps performed on a computer or other programmable device to produce computer-implemented processing, such that instructions executed on a computer or other programmable device are provided for implementing one or more processes and/or block diagrams in the flowchart The steps of a function specified in a box or multiple boxes.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé de gestion de cellules. Dans le procédé, quand une cellule exécute une opération d'activation/désactivation, un équipement d'utilisateur (UE) de la cellule ne modifie pas son association avec la cellule et ne migre pas vers d'autres cellules. L'invention concerne également un dispositif de gestion. Le dispositif comprend un module de gestion de résidence configuré pour commander à un équipement d'utilisateur (UE) d'une cellule de ne pas modifier son association avec la cellule et de ne pas migrer vers d'autres cellules, quand une cellule exécute une opération d'activation/désactivation.
PCT/CN2014/080762 2014-01-17 2014-06-25 Procédé et dispositif de gestion de cellules WO2015106543A1 (fr)

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