method and system to discover a small cell

专利摘要:
Summary method and system for discovering a small cell A method and apparatus for finding small cells is disclosed. The method comprises: a base station of a macro cell activating small cells in a non-activated state to send specific signals, and activating a user equipment (eu) to receive specific signals sent by the small cells; the base station receiving small cell information found and determined to be reported by the eu according to the specific signals received; It is the base station by selecting a portion or all of the small cells determined by the eu, and setting the selected small cells to small cells that almost serve the eu. Throughout the present invention, in a heterogeneous network of a wireless communication system, the eu in the macro cell can find the subordinate small cells of the macro cell, and the network side can select suitable small cells to provide services to the eu; furthermore, the mechanism of the present invention ensures the efficiency and energy saving on both the network and the eu side. 1/1
公开号:BR112015006025A2
申请号:R112015006025
申请日:2013-09-10
公开日:2019-11-19
发明作者:Dai Bo；Xia Shuqiang；Gou Wei
申请人:Zte Corp；
IPC主号:

专利说明:

METHOD AND SYSTEM FOR DISCOVERING A SMALL CELL TECHNICAL FIELD [001] The present invention relates to the field of mobile communications and especially to a method and system for configuring a wireless terminal.
BACKGROUND [002] With the development of the mobile communication industry and an increasing demand for a mobile data service, there is an increasingly stringent user requirement for the mobile communication rate and Quality of Service (QoS). Thus, the research and development of a next generation mobile communication system was launched before commercial use on a large scale use of a third generation (3G) mobile communication. In a typical Long Term Evolution (LTE) project initiated by the 3rd Generation Partnership Project (3GPP), the spectrum greater than the bandwidth an LTE system can provide is 20 MHz (Megahertz). As a network continues to evolve, LTE-Advanced (LTE-A) as an advanced LTE system can provide spectrum bandwidth up to 100 MHz, support more flexible, higher quality communications with excellent backward compatibility. In the LTE-A system, there are multiple support elements (CC); a user LTE device (UE) can only operate on a given backward compatible CC, while a more capable EU LTE-A can transfer at the same time on multiple CCs. That is, the simultaneous transfer and reception of data from an EU LTE-A on multiple CCs can be implemented, thereby increasing the bandwidth. Such technology is referred to as the aggregation of
2/30 multi-carriers.
[003] In existing LTE, to improve EU communication within a local hotspot and increase spectral efficiency, a small cell is introduced. A small cell covers a small range (with a radius of tens of meters), with a low transmission power and a high implantation density. A small cell is referred to in the context of a macro cell. A macro cell in general covers a large amplitude (of a radius of 500 meters or more) with a high transmission power. A macro cell can use a frequency identical to that of a small cell, it can also use a different frequency. When a different frequency is used, the macro cell, in general, can use a lower band for larger scale coverage, a small cell in general can use a larger band, providing a high-speed data service. Fig.l is a schematic diagram of typical coverage of a macro cell and small cells. There are several small cells under the macro cell cover. Each of the small cells uses a different band. The macro cell uses a frequency f1. A small cell uses an f2 frequency. Of course, in a carrier set, both the macro cell and the small cell can use multiple frequencies, and the frequencies of the macro cell and the small cell do not overlap. For example, according to a carrier attribute, a macro cell, in general, uses a frequency of 2 GHz or less, and a small cell in general uses a frequency of 3Ghz or more.
[004] As a small cell covers a small band and there is a large number of small cells, and the
3/30 most small cells use frequencies different from those used by the macro cell, in a system configured with a small cell, a UE may have to perform measurement
between frequencies frequent, what can have impact on HUH as follows.[005] 1, the EU can have a raise of consumption in energy;[006] 2, could have an impact on the transfer
data from the macro cell to the EU, as in the measurement of inter-frequencies, the transfer of data with the
original frequency for the majority From UEs can have to to be interrupted.[007] So , in a system with a big number in small cells, the optimization in measurement of cells
may need to be taken into account to help an EU save energy.
[008] In addition, in the existing research, based on the aggregation of Multi-carriers, an LTE Rll phase raises a new requirement for the use of spectrum resources, saving network energy, and suppressing interference between cells. For this purpose, a new type of transport is proposed for application with aggregation of transporters. With the new type of transport, without the compatibility to be taken into account in the design, and the new type of support can be applied with newer technology. For example, with a current definition LTE Rll, a new carrier is defined to pair with at least one compatible carrier in application, and no LTE cell specific reference signal R8 (CRS) can be configured on a new carrier to avoid serious interference edge
4/30 of CRS cells between neighboring cells, especially CRS interference between a macro cell and a small cell in a heterogeneous network (HetNet).
[009] Any carrier in a small cell can be configured with a new type of carrier, which can effectively help save energy in a small cell. For example, a small non-EU service cell can be deactivated, and it can help save energy on one side of the network. However, no solution is proposed in the related art to allow a deactivated small cell to be discovered by a UE to be configured with a small cell and to be configured for the UE, or to select from a large number of small cells, a small cell suitable for a UE.
SUMMARY [010] For this purpose, it is desirable that one embodiment of the present provides a method and apparatus for the discovery of a small cell, capable of at least implementing the discovery, by a UE in a macro cell, of a small cell under the macro cell, implementing energy saving on the grid side and a UE.
[011] For this purpose, a technical solution according to an embodiment of the present can be implemented as follows.
[012] A method for the discovery of a small cell may include: triggering, by a macro cell management base station, reception of a specific signal by a user device (UE). The specific signal can identify a small cell.
[013] The base station can notify, for
5/30 signaling, a small cell management base station to send the specific signal.
[014] The method may also include: after triggering, by a base station, the receipt of a specific signal by a UE, which receives, by the base station, information about any small cell discovered and determined to report by the UE according to the specific received signal; and the selection, by the base station, of part or all of the cell of any small cell reported by the UE, and the configuration of such a selected small cell such as a candidate serving the small cells of the UE.
[015] The method may also include: after the selection, by the base station, part or all of any small cell reported by the UE, and the configuration of such a small cell selected as a candidate serving small cells of the UE, causing , by the base station, sending a candidate that serves as a small cell measurement signal to the UE; receiving, by the base station, a candidate serving as a small cell for measuring results reported by the UE; select, according to the candidate received serving the small cell measurement result, a candidate who serves as a small UE service cell; and activating the small UE service cell.
[016] The base station can select a candidate that serves as the small service cell of the UE according to a small cell load, channel quality, and support aggregating capacity of the UE.
[017] The specific signal can be one of the following: [018] a signaling discovery;
6/30 [019] a Channel State Information Reference Signal (CSI-RS);
[020] a Primary synchronization signal (PSS) and / or a Secondary synchronization signal (SSS);
[021] a tracking reference synchronization signal; and [022] a cell-specific reference signal (CRS).
[023] The base station can notify, via a macro cell, the UE of the specific signal or a range to detect the specific signal.
[024] A carrier in the small cell can include a carrier of a new type of carrier.
[025] The small cell can support no idle EU camp.
[026] When no data is transferred to an UE in a small cell, a small cell can be inactive, and no specific signal identifying the small cell can be sent. When data is transferred to a UE in a small cell, the small cell can be in an active state, and the small cell specific identification signal can be sent.
[027] A small inactive cell can be activated by the base station and a specific signal that identifies the small activated cell can be sent only when it is determined that the small cell configuration is required for at least one UE. No specific signal that identifies a small inactive cell can be sent.
[028] The base station can trigger the reception of the specific signal by the UE by sending Control signals
7/30 of Radio Resources (RRC) for signaling or broadcasting.
[029] No specific signal can be received by the UE before the reception of the specific signal by the UE is triggered by the base station.
[030] Any small cell reported by the UE can include a small cell with channel quality satisfying a requirement.
[031] The base station can select part or all of any small cell reported by the UE according to a small cell load, channel quality, and the carrier aggregation capacity of the UE, and configure such a small cell as a selected candidate serving the small cells of the UE.
[032] The candidate serving the small cell measurement signal can be a Channel State Information Reference Signal (CSI-RS) or a Cell Specific Reference Signal (CRS).
[033] When no data is transferred to a UE in a small cell or a small cell is not configured as a candidate that serves a small cell in a UE, no candidate signal that serves for the measurement of small cells for the measurement of small cells cells can be sent. When data is transferred to a UE in a small cell or a small cell is configured as a candidate serving a small cell of a UE, a candidate serving as a small cell measurement signal for measuring the small cell can be sent.
[034] The small cell specific identification signal can no longer be sent once it is determined that the small cell is not configured as a
8/30 candidate serving small cells.
[035] A device for discovering a small cell can apply to a base station for managing a macro cell. The device may include:
[036] a drive module configured to trigger the reception of a specific signal by a User Equipment (UE), in which the specific signal identifies a small inactive cell.
[037] The drive module can notify, through signaling, a small cell management base station to send the specific signal.
[038] The device may also include: an information receiving module configured to receive information about any small cell discovered and determined to report by the UE according to the specific signal received; and [039] a configuration module configured to select part or all of any cell from any small cell reported by the UE, and the configuration of such a small cell as a selected candidate serving as a small cell of the UE.
[040] The device can also include: an activation module configured to: trigger the sending of a candidate serving the small signal measurement cell to the UE; receiving a candidate who serves as the cell measurement result reported by the UE; select, according to the candidate received as the result of the small cell measurement, a candidate who serves as a small cell of the UE small cell service; and activating the small UE service cell.
[041] The activation module can also be
9/30 configured to: select a candidate that serves as a small cell as a small service cell of the UE according to a small cell load, channel quality, and the carrier aggregation capacity of the UE.
[042] The drive module can also be configured to: trigger the reception of the specific signal from the UE, sending Radio Resource Control (RRC) signaling or by emission.
[043] The configuration module can also be configured to: select part or all of the cell of any small cell reported by the UE according to a small cell load, channel quality, and the carrier aggregation capacity of the UE , configuring such a small cell selected as a candidate serving as a small cell of the UE.
[044] A small cell Network Element (NE) can include:
[045] a notification that receives the module configured to: receive the notification sent by a macro cell management base station to send a specific signal identifying a small inactive cell; and [046] a specific signal sending module configured for: after receiving the notification sent by the base station, manage the macro cell, sending the specific signal to a User Equipment (UE) in the macro cell.
[047] The small NE cell can also include: a send module measurement signal configured for: when the small cell is selected as a candidate serving
10/30 small cells of the UE, sending a measurement signal from the candidate serving as small cell of signal measurement to the UE according to a triggering of the base station.
[048] The small cell NE may further include: a module serving UE configured to: serve the UE when the small cell is activated by the base station as a small service cell of the UE.
[049] The small cell can support no idle EU camp.
[050] The small NE cell can be inactive and send no specific signal when not transferring data to an UE. The small cell NE can be active and send the specific signal that identifies the small cell when data is transferred to a UE in the small cell.
[051] The small NE cell can be configured to: not send any measurement signal from candidate serving small cells when there is no data to be transferred to a UE in the small cell or the small cell is not configured as a candidate serving cells small; and / or sending a candidate measurement signal serving small cells when the small NE cell transfers data to a UE or the small cell is configured as a candidate serving small cell.
[052] User equipment (UE) may include:
[053] a specific signal receiving module configured to receive a specific small cell identification signal under a macro cell according to a trigger of a macro cell management base station; and [054] a small cell reporting module
11/30 configured to: discover the small cell according to the specific signal received, and report information about a discovered small cell to the base station.
[055] The UE may also include: a measurement module configured to receive a small cell candidate measurement signal to measure a candidate serving the small cell selected by the base station, and reporting a candidate measurement result that serves the small cell to the base station.
[056] The module that receives the specific signal can be configured to not receive any specific signal without the activation of the base station.
[057] The module that reports the small cell can be configured to report a small cell with channel quality satisfying a requirement.
[058] With a method and apparatus for the discovery of a small cell according to a modality at present, in a HetNet of a radio communications system, a UE in a macro cell can discover a small cell under the macro cell, and a network side can select a small cell suitable to serve a UE. With disclosure, effective energy savings can be ensured, both on one side of the network and on an UE.
BRIEF DESCRIPTION OF THE DRAWINGS [059] Fig.l is a schematic diagram of typical coverage of a macro cell and small cells in the related technique.
[060] Fig. 2 is a flow chart of a method for discovering a small cell according to one embodiment of the present.
12/30
DETAILED DESCRIPTION [061] A technical solution of the disclosure is described below with reference to the drawings and modalities.
[062] A method for discovering a small cell according to one embodiment of the present, as shown in Fig. 2, can include steps as follows.
[063] In step 201-202, a base station, that is, eNB, managing a macro cell triggers the sending of a specific signal, and triggers the reception of the specific signal by a UE. The specific signal can identify a small inactive cell. The trigger can include sending a notification by signaling or by a special signal. For example, the base station may send a pulse signal. In fact, the base station managing the macro cell can also manage a small cell (introduction here is in the context of a HetNet). A small inactive cell refers to a small cell that does not serve a UE.
[064] In steps, a base station can trigger the sending of a specific signal. The specific signal can identify a small cell. The base station can trigger the reception of the specific signal by a UE. The base station can manage the small cell. For example, the small cell can be under the macro cell. Alternatively, two macro base stations or two small cells can be involved. A base station can trigger the sending of such a specific signal by signaling a base station managing the small cell to send the specific signal.
[065] The base station that manages the macro cell (that is, the eNB shown in Fig. 2) can trigger, when necessary, the sending of a specific identification signal
13/30 of a small subordinate cell, and trigger the reception of the specific signal by a UE.
[066] The base station can notify, via a macro cell, the UE of the specific signal or a range to detect the specific signal.
[067] A small inactive cell can be activated by the base station and a specific signal for the small activated cell can be sent only when it is determined that the small cell configuration is required for at least one UE. No specific signal can be sent to a small inactive cell according to one embodiment of the present.
[068] The base station can trigger the reception of the specific signal by the UE by sending signaling Radio Resource Control (RRC) signaling or by broadcast.
[069] No such specific signal can be received by the UE before the reception of the specific signal by the UE is triggered by the base station.
[070] In step 203, the base station receives information about any small cell discovered and determined to report by the UE according to the specific signal received.
[071] In the step, the base station can receive the referred information determined by the UE according to a given received signal. The step is optional. For example, in the next step 201 ~ 202, the base station can only use information in step 203, such as the reference information for determining a small cell.
[072] A UE can recognize and determine a corresponding small cell according to a given signal
14/30 received, and communicate that information about a small cell determined to the base station. A small cell communicated by the UE can be one with channel quality satisfying a requirement. For example, a UE can report M cell IDs (or measured indices and strengths) with better measurement results. When measurement is carried out on carriers of different frequencies, their frequency information must also be communicated.
[073] In step 204, a part or all of any small cell communicated by the UE can be selected by the base station. Such selected small cell can be configured by the base station as a small candidate cell to serve the UE. A small candidate cell to serve refers to one configured for the UE. It is necessary to determine whether a small candidate cell to serve is used to transfer data to the UE.
[074] In the step, the base station can configure a cell that serves the UE according to the information communicated by the UE. The step is optional. For example, the base station may use information about a small cell communicated by a UE only as a reference in the configuration of the small cell serving the UE. In an extreme case (for example, when any small cell communicated by the UE is heavily charged), the base station can configure a small cell not communicated by the UE to the UE.
[075] The base station can select part or all of any cell from any small cell
15/30 reported by the UE, and configure such a small cell selected as a small candidate cell to serve the UE.
[076] The base station that selects part or all of any small cell reported by the UE according to a small cell load, channel quality, and the carrier aggregation capacity of the UE, and configures such a small cell as a selected candidate serving the small cells of the UE.
[077] The small cell specific identification signal can no longer be sent once it is determined that the small cell is not configured as a candidate serving small cells from the UE. Optionally, after step 203, there may be a step 203a, in which the base station can communicate to stop sending a small cell-specific identification signal not configured as a candidate serving small cells of the UE.
[078] Following step 204, there may be a step 205-207, in which the base station may cause a candidate to be sent as a small cell measurement signal to the UE, to receive a candidate as a measurement result small cell communicated by the UE, select, according to the candidate received serving the small cell, a candidate serving the small cell as a small EU service cell, and activate the small EU service cell.
[079] The base station can select a candidate that serves as the small service cell of the UE according to a small cell load, channel quality, and support aggregating capacity of the UE.
16/30 [080] No small cell measurement signal serving the candidate can be sent before a small cell is configured as a small cell serving the candidate.
[081] When no data is transferred to the UE in a small cell or a small cell is not configured as a candidate that serves as small cells, none of the candidate measurement signal that serves to measure small cells in the small cell can to be sent. When data is transferred to the UE in a small cell or a small cell is configured as a candidate serving small cells, a candidate serving as a small cell measurement signal for small cell measurement can be sent.
[082] Note that in the flowchart shown in Fig. 2, a step corresponding to a dashed arrow is optional.
[083] In the flow, both the base station and the UE are configured to save energy. According to one embodiment of the present, some or all of the carriers in a small cell can be of a new type of carrier. When a small cell is configured for non-UE or the small cell or no data is transferred to any UE in a small cell, no information (neither specific signal nor measurement signal) for the small cell is sent. The small cell may be inactive (disabled to be in a power-saving state). Alternatively, a small cell is inactive before sending a specific signal that identifies that the small cell is activated by the base station. Sending a relevant signal to such a small cell (such as a signal
17/30 specific) is activated only when necessary by the base station, thus ensuring energy savings on the network side. A small cell supports no idle UE camp. An idle EU may have to camp in the macro cell. A small activated cell (ie a small cell configured for at least one UE or currently transferring data to a UE) continues to send the specific signal, so that a UE can discover a small activated cell with ease.
[084] An idle UE can receive no small cell identification or measurement signal, so that an idle UE is not required to discover a small cell or perform measurement for a small cell, thereby implementing energy savings. After an idle UE is turned on, the specific signal it receives from the connected UE is triggered by the base station, as needed (for example, according to a small cell load, channel quality, carrier aggregation capacity of the EU, etc.).
[085] A specific signal according to a modality refers to a signal capable of identifying a small cell. A UE can recognize and determine a small cell upon receiving or detecting such a specific signal. A specific signal according to one embodiment of the present may include, but is not limited to, one of a discovered signal, a Channel State Information Reference Signal (CSI-RS), a primary synchronization signal (PSS) and / or a Secondary synchronization signal (SSS), a synchronization control reference signal, and a Cell Specific Reference Signal (CRS).
18/30 [086] Discovery signaling is small cell identification information sent through a physical layer. Alternatively, a PSS / SSS / CRS, a Positioning Reference Signal (PRS), or a CSI-RS at present can serve as the uncovered signal. A CSI-RS sequence is calculated according to a small cell identification (ID). Therefore, after detecting a CSI-RS, a UE can acquire a small cell ID corresponding to CSIRS. PSS and SSS can be used to transport a small cell ID. A tracking reference sync signal is similar to a CRS and CSI-RS. Upon detection of a CRS or CRS reference signal, a UE can acquire a small cell ID.
[087] The base station can notify, through a macro cell, a UE regarding a certain signal sent for the identification of a small cell, implementing the immediate reception by the UE, avoiding the blind detection of such a specific signal. Alternatively, the base station can notify, through a macro cell, a UE of a range to detect the specific signal. This can also help the UE to reduce the workload in determining sequences. For example, the UE can be notified of specific signal configuration information, such as CSI-RS configuration information (including one or more units without resource control information in CSI-RS-Config, CSI-RS-ConfigNZP, CSI- RSConfigNZPId, CSI-RS-ConfigZP, and CSI-RS-ConfigZPId) and a possible value or set of values from a CSI-RS physical layer sequence.
19/30 [088] The base station must determine that the small cell configuration is required for at least one UE before activating an inactive (deactivated) small cell and trigger the sending of a specific signal to the small cell activated. In the specific implementation, no specific small cell identification signal is sent, not if no activation for the small cell sent by the base station is received. In fact, the small cell remains disabled for grid-side energy saving. However, a specific signal is to be sent to identify a small cell that serves at least one UE or to configure a UE in such a way that a suitable UE can timely discover and be served by the small cell.
[089] When it is determined that the configuration of the small cell for a UE is necessary according to load balance, signal quality, a need for scheduling, etc., the base station may cause a specific signal to be sent ( through which a small inactive cell under the macro cell can be identified), and triggering the reception of the specific signal by the UE. The base station can trigger the reception of the specific signal by the UE through the dedicated Radio Resource Control (RRC) signaling or broadcast. No specific signal can be received by the UE before the reception of the specific signal by the UE is triggered by the base station. An idle UE may not receive any specific signal. When a trigger is received to receive a specific signal, a UE may have to recognize and verify a corresponding small cell according to a specific signal received, and
20/30 communicate, to the base station, a small cell verified with channel quality satisfying a predefined requirement. The base station can select some or all of any small cell communicated by the UE according to a small cell load, channel quality, and carrier aggregation capacity of the UE, and configure such a selected small cell for the HUH. The base station can re-disable a small cell not configured for the UE to save energy.
[090] After configuring a small cell (such as a small candidate cell to serve the UE) for a UE, the base station can cause a measurement signal to be sent that serves a small candidate cell to serve in such a way. so that the UE can perform the measurement on the small cell configured for the UE by the base station. The measurement signal can include, but is not limited to, CSI-RS and a CRS. No candidate small cell measurement signal to serve small cell measurement is sent without a drive from the base station, because of the grid's energy savings. When no data is transferred to a UE in a small cell or a small cell is not configured as a candidate that serves a small cell of a UE, no candidate signal that serves to measure small cells for measuring small cells can be Sent. When data is transferred to a UE in a small cell or a small cell is configured as a candidate serving a small cell of a UE, a candidate serving as a small cell measurement signal for measuring the small cell can be sent.
[091] The UE may have to communicate, to the
21/30 base, a measurement result of a small candidate cell to serve configured for the UE by the base station. The base station can activate, according to the result, a small cell that meets a predefined requirement to serve the UE. The preset requirement may include a reference to the small cell load, channel quality, and aggregation capacity of a UE's carrier.
[092] A small cell can serve the UE after configuration and activation. That is, the base station can first configure a small cell for a UE. During the configuration of the small cell, a UE may have to discover a small cell before determining a suitable small cell for the UE. A small cell configured for a UE by the base station (i.e., a small candidate cell to serve) is not necessarily activated by the base station like the small cell serving the UE.
[093] In one embodiment of the present, the sending of a specific signal can be triggered by the base station. A small cell can support no idle EU camp. Therefore, a specific signal identifying a small cell that does not serve any UE can no longer be sent, in such a way that the small cell remains disabled to save energy. An idle UE may not receive any specific signal and camp in a macro cell, in such a way that an idle UE may not have to perform frequent measurement of small cells, thus allowing an UE to save energy. That is, an idle UE can operate as if there are no small cells.
[094] Disclosure is explained below with modalities.
22/30 [095] In one embodiment of the present, the coverage of a macro cell and a small cell subordinate to it in a HetNet inter-frequency is as shown in Fig.l. According to a method of the present, in the network implementation, a macro cell carrier can include at least one carrier that uses a compatible carrier type for further coverage. The carrier in a small cell under the macro cell can adopt a new type of carrier and be
implanted in one hotspot for provide a better one experience of[096] user in the serviceA macro cell of data.may have to stay activated.[097] An small cell under a cell macro can
having to continue deactivated (ie an air interface remains deactivated and neither sends nor receives information) until the sending of a corresponding specific signal is triggered via the macro cell. When a small cell under a macro cell is serving a UE (ie, activated by a base station to serve the UE), or is configured for a UE by the base station (ie, sending a specific signal to the small cell, although the small cell is not activated as a service cell of the UE), the small cell may have to continue transmitting the specific signal.
[098] An idle UE can receive no specific signal without triggering a base station managing a macro cell. Upon receiving a specific signal, a UE can recognize, discover, and determine a small cell according to the specific signal received, and communicate that information about a small cell
23/30 determined for the base station managing the macro cell. A base station managing a macro cell can configure, for a UE, a suitable small cell reported by the UE according to a small cell load, channel quality, and carrier aggregation capacity supported by the UE.
[099] A macro cell management base station can cause a candidate small cell measurement signal to be sent to serve to measure a small cell configured for a UE, and trigger the deactivation of a small cell configured for non-EU . The UE can perform the measurement of a small cell configured for the UE, and communicate the measurement result to the base station that manages the macro cell. The base station that manages the macro cell can activate a small cell that serves a UE according to the measurement result, a small cell charge, and the carrier aggregation capacity of the UE.
[100] In one embodiment 2 of the present, the coverage of a macro cell and a small cell subordinate to it in a HetNet inter-frequency is as shown in Fig.l. The disclosure can also be applied to a case where a compatible carrier type is implanted for a small cell.
[101] In the modality, a small cell does not support any camp. A UE can camp in a macro cell. Thus, the discovery and configuration of the macro cell and the small cell as described in mode 1 can also be applied here. Energy savings on one side of the grid and on one side of the EU can be ensured in the same way.
[102] In Modality 3 hereof, coverage of
24/30 a macro cell and a small cell subordinate to them on a HetNet inter-frequency is as shown in Fig.l. The disclosure can also be applied to a case where a compatible carrier type is implanted for a small cell.
[103] In modality, a small cell supports camp. A UE can camp in a suitable small cell. The implementation is as follows.
[104] A macro cell can have to stay activated. [105] Sending a signal specific in a cell small under a cell macro can Continue,
regardless of the fact that the small cell is configured or enabled for a UE. An idle UE may also have to receive a specific signal, and identify and determine a neighboring small cell in time using the specific signal. The EU can update and save a small, determined cell in real time. When the specific signal supports the UE measurement, the UE can immediately perform the measurement according to the specific signal, and select a small cell that satisfies a camping condition on which to camp. When the specific signal does not support any UE measurement, the UE can perform the measurement using a reference signal for the measurement (such as a CRS) in the small cell, and select an appropriate small cell for camping according to the measurement result.
[106] When the base station has to configure a small cell for a UE, for example, for a UE in a connected state, the reception of a specific signal by the UE through the macro cell is activated in such a way that the UE can
25/30 check a small cell. The UE can report a small cell discovered to the macro cell (reporting a nearby small saved cell; in fact, the UE can receive a specific signal in real time). A suitable small cell under the macro cell can be configured for the UE. The UE can perform the measurement for a small cell configured for the UE, and report a measurement result. A small cell suitable according to the macro cell is selected and activated to serve the UE.
[107] In Modality 4 hereof, the coverage of a macro cell and a small cell subordinate to them in a HetNet inter-frequency is as shown in Fig.l. According to a method of the present, in the network implementation, a macro cell carrier can include at least one carrier that uses a compatible carrier type for further coverage. The carrier in a small cell under the macro cell can adopt a new type of carrier and be
implanted in a hotspot for provide an best experience of[108] activated.[109] small under user in the serviceA macro cellSending a signala cell of data.may have tospecific inmacro can staya cell continues,
regardless of the fact that the small cell is configured or enabled for a UE. A linked UE may also have to receive a specific signal, and identify and determine a neighboring small cell in time using the specific signal. Preparation is done by small cell measurement, such that the UE in the on state can measure only a small cell discovered in the
26/30 nearby. That is, the measurement can only be performed on a small cell frequency uncovered.
[110] An idle UE may receive no specific signal without triggering a base station managing a macro cell. Upon receiving a specific signal, a UE can recognize, discover, and determine a small cell according to the specific signal received, and communicate that information about a determined small cell to the base station managing the macro cell. A base station managing a macro cell can configure, for a UE, a suitable small cell reported by the UE according to a small cell load, channel quality, and carrier aggregation capacity supported by the UE.
[111] A macro cell management base station can cause a candidate small cell measurement signal to be sent to serve to measure a small cell configured for a UE, and trigger the deactivation of a small cell configured for non-EU . The UE can perform the measurement of a small cell configured for the UE, and communicate the measurement result to the base station that manages the macro cell. The base station that manages the macro cell can activate a small cell that serves a UE according to the measurement result, a small cell charge, and the carrier aggregation capacity of the UE.
[112] According to a method for discovering a small cell according to one embodiment of the present, an apparatus for discovering a small cell is provided according to one embodiment of the present. The device is applicable to a base station managing a
27/30 macro cell, and can include a drive module.
[113] The drive module can be configured to trigger the reception of a specific signal by User Equipment (UE), where the specific signal identifies a small inactive cell.
[114] The drive module can notify, via signaling, a small cell management base station to send the specific signal.
[115] The device may also include an information receiving module and a configuration module.
[116] The information receiving module can be configured to receive information about any small cell discovered and determined to report by the UE according to the specific signal received.
[117] The configuration module can be configured to select part or all of any cell from any small cell reported by the UE, and the configuration of such a small cell as a selected candidate serving as a small cell of the UE.
[118] The device can also include: an activation module configured to: trigger the sending of a candidate serving the small signal measurement cell to the UE; receiving a candidate who serves as the cell measurement result reported by the UE; select, according to the candidate received as the result of the small cell measurement, a candidate who serves as a small cell of the UE small cell service; and activating the small UE service cell.
[119] The activation module can be further configured to: select a candidate who serves as
28/30 small cell as small service cell of the UE according to a small cell load, channel quality, and the carrier aggregation capacity of the UE.
[120] The drive module can also be configured to: trigger the reception of the specific signal from the UE, sending Radio Resource Control (RRC) signaling or by emission.
[121] The configuration module can be further configured to: select part or all of the cell of any small cell reported by the UE according to a small cell load, channel quality, and the carrier aggregation capacity of the UE , configuring such a small cell selected as a candidate serving as a small cell of the UE.
[122] A small Network Element (NE) cell can include a notification receiving module, and a specific signal sending module.
[123] The reception notification module can be configured to: receive the notification sent by a base station managing a macro cell to send a specific signal identifying a small inactive cell.
[124] The specific signal sending module can be configured to: after receiving the notification sent by the base station managing the macro cell, send the specific signal to a User Equipment (UE) in the macro cell.
[125] The NE can also include a send module measurement signal configured for: when the small cell is selected as a candidate small cell to serve the UE, sending a small cell measurement signal
29/30 candidate to serve the UE according to a trigger from the base station.
[126] The NE can also include a UE serving module configured to: serve the UE when the small cell is activated by the base station as a small UE service cell.
[127] The small cell can be configured to support no idle UE camp.
[128] The small NE cell can be inactive and send no specific signal when not transferring data to a UE. The small cell NE can be active and send the specific signal that identifies a small cell when data is transferred to a UE in the small cell.
[129] The small NE cell can be configured to: not send any candidate small cell measurement signal to serve when there is no data to be transferred to a UE or when the small cell is not configured as a small candidate cell to serve a UE ; and / or sending a candidate small cell measurement signal to serve when the small NE cell transfers data to a UE or the small cell is configured as a small candidate cell to serve a UE.
[130] A UE may include a specific signal receiving module and a small cell information module.
[131] The specific signal that the module receives can be configured to receive a specific identification signal from a small cell under a macro cell according to a trigger from a macro cell management station.
30/30 [132] The small cell reporting module can be configured to: discover the small cell according to the specific signal received, and report information about a small cell discovered to the base station.
[133] The UE may further include: a measurement module configured to receive a small cell candidate measurement signal to measure a candidate serving the small cell selected by the base station, and reporting a candidate measurement result that serves the small cell to the base station.
[134] The module that receives the specific signal can be configured to not receive such a specific signal without the activation of the base station.
[135] The module that reports the small cell can be configured to report a small cell with channel quality to satisfy a requirement.
[136] The terms of the present disclosure are merely described and are not intended to limit the scope of the present disclosure.

权利要求:
Claims (15)
[1]
1. METHOD FOR DISCOVERING A SMALL CELL, characterized by comprising:
triggering, by a base station managing a macro cell, the receipt of a specific signal by a User Equipment (UE) by notification, through the macro cell, of the UE of the specific signal;
when the specific signal supports a UE measurement, executing, by the UE, the measurement according to the specific signal; and recognition and determination by the UE of a small cell corresponding to a specific signal received, and reporting to the base station information about a particular small cell, where a specific signal continues to be sent in a small cell under the macro cell regardless of whether the small cell is configured or enabled for a UE.
[2]
2. METHOD, according to claim 1, characterized by the specific sign identifying a small cell, one of which is:
a discovery signal;
a Channel State Information Reference Signal (CSI-RS);
a Primary synchronization signal (PSS) and / or a Secondary synchronization signal (SSS); and a Cell Specific Reference Signal (CRS), where the discovery signal is small cell identification information, and a PSS / SSS / CRS or CSIRS serves as a discovery signal.
[3]
3. METHOD, according to claim 1,
2/5 characterized by also understanding: after triggering, by the base station, the reception of the specific signal by the UE, the reception, by the base station, of information about any small cell discovered and determined to report by the EU according to the specific signal received; and selecting, by the base station, a part or all of any small cell reported by the UE, and configuring such a selected small cell as a candidate small cell to serve the UE.
[4]
4. METHOD according to claim 3, further comprising: after selection, by the base station, of part or all of any small cell reported by the UE, and configuring such a selected small cell as a candidate small cell to serve the UE, triggering, through the base station, the sending of a measurement signal from a small candidate cell to serve the UE; receiving, by the base station, a measurement result for a small candidate cell to serve reported by the UE; selection, according to the measurement result of the small cell candidate to serve received, a small cell candidate to serve as a small cell serving the UE; and activating the small cell that serves the UE.
[5]
5. METHOD, according to claim 1, characterized in that the UE is notified of specific signal configuration information; when the specific signal comprises a CSI-RS, the specific configuration information of the signal comprises CSI-RS configuration information and a value of a CSI-RS physical layer sequence.
[6]
6. METHOD, according to claim 1,
3/5 characterized by the base station activating the reception of the specific signal by the UE by sending signaling or by broadcasting Radio Control Resources (RRC) dedicated.
[7]
7. METHOD, according to claim 1, characterized in that the UE reports to the base station a small cell with channel quality satisfying a requirement.
[8]
8. METHOD, according to claim 1, characterized by the UE recognizing and verifying a small cell corresponding to a specific received signal and reporting to the base station a small cell verified with channel quality satisfying a previously established requirement.
[9]
9. METHOD, according to claim 1, characterized by further comprising: before activation by the base station managing a macro cell, the reception of a specific signal by a UE activating, by the base station, the sending of the specific signal by a base station managing a small cell.
[10]
10. SYSTEM FOR THE DISCOVERY OF A SMALL CELL comprising a base station managing a macro cell and user equipment (UE), characterized in that the base station is configured to: enable the reception of a specific signal by the UE by notification, through the macro cell, the UE of the specific signal; and the UE is configured for: when the specific signal supports the UE measurement, perform the measurement according to the specific signal; and recognize and determine a small cell corresponding to a specific signal received, and report information on a base station to the base station.
4/5 certain small cell, in which a specific signal continues to be sent in a small cell under the macro cell regardless of whether the small cell is configured or activated for a UE.
[11]
11. SYSTEM, according to claim 10, characterized by the specific sign identifying a small cell, and being one of:
a discovery signal;
a Channel State Information Reference Signal (CSI-RS);
a Primary synchronization signal (PSS) and / or a Secondary synchronization signal (SSS); and a Cell Specific Reference Signal (CRS), where the discovery signal is small cell identification information, and a PSS / SSS / CRS or CSIRS serves as a discovery signal.
[12]
12. SYSTEM, according to claim 10, characterized in that the UE is configured to receive configuration information from the specific signal, in which when the specific signal comprises a CSI-RS, the configuration information of the specific signal comprises configuration information CSI- RS is a value of a CSI-RS physical layer sequence.
[13]
13. SYSTEM, according to claim 10, characterized in that the base station is configured to activate the reception of the specific signal by the UE by sending dedicated Radio Resource Control (RRC) signaling or broadcasting.
[14]
14. SYSTEM, according to claim 10
5/5 characterized by the UE being configured to recognize and verify a small cell corresponding to a specific signal received and reporting to the base station a small cell verified with channel quality satisfying a previously configured requirement.
[15]
15. SYSTEM, according to claim 10, further comprising an apparatus for the management of small cells, characterized in that the base station is configured to: before activating the reception of the specific signal by the UE, activate the sending of the specific signal by the small cell management device.

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EP2876941A4|2015-10-14|

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JP2015527018A|2015-09-10|

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CA2881277A1|2014-03-27|

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RU2015109995A|2016-11-10|

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