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    • 专利摘要:
    METHOD, APPARATUS AND SYSTEM FOR IMPROVING MOBILITY IN XRDIt is a user equipment (UE) (300) which, when it is in a CONNECTED state with a base station (410) of a wireless network (400) and is also in a discontinuous reception mode (DRX), an XRD parameter as a XRD period for the EU is compared to a threshold. If the DRX parameter is at or below the limit, the UE (300) applies a network-controlled mobility mode with UE assistant in which the network controls the transfer of the UE (300) to another cell. If the XRD parameter is above the limit, the UE (300) applies an EU-controlled mobility mode in which the UE (300) is free to select the best cell. In this way, the benefit of reduced power consumption DRX is maintained while the time period in which the UE (300) is unreachable is minimized.
    公开号:BR112012027785A2
    申请号:R112012027785-5
    申请日:2011-03-29
    公开日:2020-08-25
    发明作者:Mats Sagfors；Stefan Wager
    申请人:Telefonaktiebolaget Lm Ericsson (Publ)；
    IPC主号:
    专利说明:

    "METHOD, APPARATUS AND SYSTEM FOR IMPROVING MOBILITY IN DRX" "
    TECHNICAL FIELD The technical field of the present disclosure refers to the method, devices and systems to improve the mobility of one or more user equipment operating in an XRD mode. In particular, the present disclosure relates to methods, apparatus and systems for reducing power consumption, performing measurement, and providing measurement reporting activities for one or more user equipment that are in a long XRD mode while in a CONNECTED state.
    BACKGROUND In wireless network systems such as Broadband Code Division Multiple Access (WCDMA) and Long Term Evolution (LTE), discontinuous reception mode (DRX) can be used to reduce power consumption in user equipment ( HUH). Figure 1 illustrates an XRD cycle or XRD period that includes periods of XRD opportunity and duration. During the duration period, the UE turns on its receivers to listen to program information on network downlink control channels. In LTE, for example, program information is transmitted by eNodes B on the Physical Downlink Control Channel (PDCCH). During the DRX opportunity period, the UE can turn off its receivers, that is, enter sleep mode, to reduce battery consumption. The DRX mode is important to increase standby times for mobile devices such as small handsets.
    Also in wireless systems, the mobility of a UE in terms of handover from one cell to another or a cell reselection can be either controlled by the network or controlled by the UE. In network-controlled mobility mode, nodes on the network infrastructure side like the radio base station (RBS, eNode B) and the radio network controller (RNC) are in charge of moving the UE from one cell to another. The network-controlled mobility mode is typically assisted by UE in which the UE measures the signal strengths of neighboring cells, and provides measurement reports for the network. Based on these reports, the network decides whether and when a handover should be performed. Handovers are typically issued by messages from the network to the UE, where the UE is commanded to perform the handover to a specific cell.
    In UE controlled mobility mode, the UE is allowed to autonomously perform cell reselection, ie the UE is free to select a new cell based on signal measurements from multiple cells and application of some selection limits and criteria. The criteria and limits can be provided by the network. Typically, the UE reports to the new cell or cell area when cell reselection is completed.
    Wireless systems can deploy both mobility solutions. In LTE, for example, the radio resource control protocol (RRC) is modeled with two states - RRC IDLE and RRC CONNECTED. A difference between these two states is the mobility solution applied. In the RRC IDLE state, EU-controlled mobility is implanted in the —qualoUE that performs cell measurements and reselection.
    In the RRC CONNECTED state, network-controlled mobility is deployed in which the network is in control over when handover and cell reselection to the UE occurs. In this state, the location of UE is known by the network at at least one level of cell granularity, and explicit RRC signaling is involved when the UE moves from one cell to another cell.
    In the RRC IDLE state, on the other hand, the location of UE may not be exactly known. When the network needs to reach the UE, a pagination that covers a larger tracking area consisting of multiple cells may be required. Thus, the UE only needs to report its cell change when it leaves its current monitoring area, which can cover multiple cells. This reduces UE signaling and battery consumption, as the UE can move between multiple cells without being engaged in any signaling.
    LTE supports DRX mode in both RRC IDLE and RRC CONNECTED states. In the RRC IDLE state, the suspension periods that the UE can apply are primarily restricted by the paging period, that is, the periodicity at which the UE needs to read the downlink channels from the network to see if there are any targeted paging messages. for the UE. Typical paging periods range from hundreds of milliseconds to several seconds. Among these pagination opportunities, the UE may be in suspension.
    In the RRC CONNECTED state, depending on the activity level of the UE, the UE can go successively to deeper sleep modes. UE activity refers to circumstances in which the UE is programmed to receive messages from or transmit messages to the network. The UE is "active" if it is programmed for uplink and / or downlink communication. The UE is not considered to be active if - the same is just being activated periodically to read paging or system information.
    Referring again to Figure 1, the duration between periods in duration offers an opportunity for the UE to turn off its receivers. In LTE, two configurable DRX cycles are supported - a short DRX cycle and a long DRX cycle, see TS
    36.321.The inactive UE can increase the lengths of its XRD opportunity periods in stages and correspondingly increase its suspension periods to improve battery preservation. A range of DRX cycles configurable in the RRC CONNECTED state can be comparable to the paging cycles. Thus, it is possible to configure very effective DRX also in the RRC CONNECTED state so that a UE in the RRC CONNECTED state can have waiting times similar to a UE in the RRC IDLE state.
    In the RRC CONNECTED state, as noted above, a network-controlled mobility is deployed in which UE measurements are used to assist the handover decision. However, a UE on a long XRD cycle cannot offer similarly accurate neighbor cell measurements. To conduct cell measurements, UE receivers must be connected. To provide high measurement accuracy, the UE must turn on its receivers more frequently, and frequent measurements harm the UE in using DRX opportunities to save power.
    Wireless systems typically also include functionality to monitor the quality of the radio link between the UE and the network, and a radio link failure (RLF) is detected when certain criteria are met. When the RLF occurs, appropriate actions - are taken to recover or reestablish the connection between the UE and the network.
    Similar to the mobility measurements previously mentioned, radio link quality measurements also require receivers to be turned on. Thus, the detection of RLF is dependent on the suspension periods applied to the receivers. To facilitate long DRX opportunities, 3GPP requirements specify less stringent radio link quality monitoring when the UE is in a sleep mode, see TS 36.133, clause 7.6.
    In the RRC CONNECTED state, network-controlled mobility applies until the UE declares an RLF, after which the UE is allowed to select a better cell to recover the connection. Unfortunately, declaring the RLF and recovering it can take a considerable amount of time, during which the UE may lack the means to transmit or receive any data.
    It can be seen that in a combination of long and EU assisted XRD cycles, network-controlled mobility is a tough challenge. For example, an inactive UE with a long XRD that moves towards a cell edge may not provide accurate enough measurements for the network or may even fail to provide any reports due to the delay, thus resulting in a failed handover or a radio link failure. Providing accurate measurements, on the other hand, could waste the power saving opportunities offered by periods of XRD.
    As both the mobility measurement accuracy and the RLF criteria are functions of the XRD periods, the UE may remain without the means to transmit or receive data for an insignificant amount of time. The network will be aware of this situation of the UE, as the UE may not have reported any measurements to the network before the problem arose. In the RRC CONNECTED state, the UE is allowed to communicate only with the server cell, that is, the cell to which the UE is currently connected. However, without knowledge of the UE situation, the network is not able to move the UE to a better cell.
    Another problem is that, when the UE is on a cell border, measurement reports can be triggered repeatedly. Whenever a measurement report is triggered, the UE lets the DRX transmit the report. If this situation prevails, the UE will not be able to remain in battery saving mode, and the UE's standby time in RRC CONNECTED state will be significantly reduced.
    SUMMARY The present invention addresses many issues in the implementation of conventional XRD that includes the problems described above. One or more aspects of the present invention are directed towards methods, devices and / or systems to reduce the length of time that a UE remains unreachable from the network, and during which the UE has no means to transmit data on the uplink while still realizing power consumption benefits. One or more aspects of the present invention are also directed to methods, apparatus and / or systems for reducing battery consumption while still providing adequate measurement and measurement reporting activity for a UE that is in a long XRD mode while in a state CONNECTED.
    A first aspect of the present invention is directed to a method that operates a UE in a DRX mode and in a CONNECTED state with a base station of a wireless network. In the method, the UE can determine whether a DRX parameter of the UE is at or below a DRX limit. If the DRX parameter is at or below the DRX limit, the UE can apply a network-controlled mobility mode. Otherwise, the UE can apply an EU-controlled mobility mode. When the network-controlled mobility mode is applied, the network controls a UE handover from one cell to another. When the UE controlled mobility mode is applied, the UE is allowed to autonomously perform cell reselection.
    A second aspect is directed to a method that operates a network node in a wireless network. In the method, the network node can receive an update message, which is a cell update message or a connection reconnection request message, from a UE that performs cell reselection. Based on the update message, the network node can identify a previous UE server cell, and can retrieve an UE UE context from the previous server cell. The update message from the UE may indicate that the UE sent the update message due to the UE performing a cell reselection while the UE was in the CONNECTED state with the previous server cell and in a UE controlled mobility mode.
    A third aspect is directed to a method that operates a UE in a DRX mode and in a CONNECTED state with a base station on a wireless network.
    In the method, the UE can determine whether a DRX parameter of the UE is at or below a DRX limit.
    If the XRD parameter is at or below the XRD limit, the UE can deploy a first measurement setup to provide measurement reports from neighboring cells to the base station.
    Otherwise, the UE can implement a second measurement configuration, providing less frequent measurement reports from neighboring cells to the base station in relation to the first measurement configuration when the DRX parameter is above the DRX limit.
    Providing less frequent measurement reports also includes not providing measurement reports.
    A fourth aspect is directed to an UE for communication with a wireless network.
    The UE may comprise a processing unit, a communication unit, a storage unit and a measurement unit.
    The processing unit can be arranged performing processing to operate the UE to provide communication services to a user.
    The communication unit can be arranged to communicate with the wireless network and can include one or more wireless receivers that can be turned on and off.
    The storage unit may be arranged to store information necessary for operation of the UE and may be arranged to store code for the processing unit to perform.
    The measurement unit can be arranged to measure parameters related to radio signals.
    The processing unit can control the communication unit, the storage unit and the measurement unit to provide communication services to the user.
    When the UE is in a CONNECTED state with a wireless network base station and is operating in a —DRX mode, the processing unit can determine if a UE's DRX parameter is at or below a DRX threshold.
    When the DRX parameter is at or below the DRX limit, the processing unit can apply a network-controlled mobility mode in which the network controls a UE handover from one cell to another.
    When the DRX parameter is above the DRX limit, the processing unit can apply a UE controlled mobility mode in which the UE is allowed to autonomously perform cell reselection.
    A fifth aspect is directed at a network node in a wireless network.
    The network node may comprise a processing unit, a communication unit and a storage unit.
    The processing unit can be arranged to provide mobility enhancement services for an UE.
    The communication unit can be arranged to communicate with the UE.
    The storage unit can be arranged to store information necessary for the operation of the network node and can be arranged to store code for the processing unit to execute. The processing unit can control the communication unit and the storage unit. When the communication unit receives an update message from the UE that performs cell reselection, the processing unit can identify a previous UE serving cell based on the update message and can retrieve an UE context from the UE from the previous server cell. The update message, which is a cell update message or a request to reestablish connection from the UE, may indicate that the UE sent the update message due to the UE performing cell reselection while the UE was in the CONNECTED state with the previous server cell and in EU controlled mobility mode. A sixth aspect is directed to an UE for communication with a wireless network. The UE may comprise a processing unit, a communication unit, a storage unit and a measurement unit. The processing unit can be arranged to perform the processing to operate the UE to provide communication services to a user. The communication unit, which can include one or more wireless receivers that can be turned on and off, can be arranged to communicate with the wireless network. The storage unit can be arranged to store information necessary for the operation of the UE and can be arranged to store code for the processing unit to perform. The measurement unit can be arranged to measure parameters related to radio signals. The processing unit can control the communication unit, the storage unit and the measurement unit to provide communication services to the user. When the UE is in a CONNECTED state with a wireless network base station, the processing unit can determine whether a UE DRX parameter is at or below a DRX threshold. When the DRX parameter of the UE is at or below the DRX limit, the processing unit can deploy a first measurement configuration of measurement reports of supply of neighboring cells to the base station. When the DRX parameter is above the DRX limit, the processing unit can deploy a second measurement configuration, providing less frequent measurement reports from neighboring cells to the base station in relation to the first measurement configuration or not providing measurement reports .
    DESCRIPTION OF THE DRAWINGS The objectives, resources and advantages previously described and others of the invention will be clear from the most particular description below of preferred modalities, as illustrated in the accompanying drawings in which reference characters refer to the same parts from all different views. The drawings are not necessarily to scale.
    Figure 1 illustrates a cycle or period of XRD for a UE on a wireless network; Figure 2 illustrates an exemplary movement of a UE from one serving cell to another cell; Figure 3 illustrates a non-limiting embodiment of a UE; Figure 4 illustrates an UE in a CONNECTED state with a wireless network; Figure 5 illustrates an exemplary non-limiting method performed by an UE in a CONNECTED state with the network for improving mobility while in an XRD mode; Figure 6 illustrates an exemplary non-limiting method performed by a network node to find a context for a UE that makes a request for cell reselection or network update; Figure 7 illustrates a non-limiting embodiment of a network node; and Figure 8 illustrates an exemplary non-limiting method for configuring measurement reports performed by a UE in a CONNECTED state with the network.
    DETAILED DESCRIPTION For explanatory and non-limiting purposes, specific details are presented such as architectures, interfaces, particular techniques and so on. However, it will be clear to those skilled in the art that the technology described in this document can be practiced in other modalities that differ from these specific details. That is, those skilled in the art will be able to conceive of various arrangements that, although not explicitly described or shown in this document, incorporate the principles of the described technology.
    In some cases, detailed descriptions of well-known devices, circuits and methods are omitted so as not to obscure the description with unnecessary details. All statements in this document that recite principles, aspects, modalities and examples are intended to cover structural and functional equivalents. Additionally, it is intended that such equivalents include both currently known and developed equivalents in the future, that is, any developed elements that perform the same function, regardless of structure.
    Thus, for example, it will be noted that block diagrams in this document can represent conceptual views of principles that incorporate technology illustrative circuits. Similarly, it will be noted that any flowcharts, state transition diagrams, pseudocode and the like represent various processes that can be substantially represented in a computer-readable medium and executed by a computer or processor, whether that computer or processor is explicitly shown or not. .
    The functions of various elements that include function blocks identified or described as "processors" or "controllers" can be provided through dedicated hardware, as well as hardware capable of running associated software. When provided by a processor, functions can be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which can be shared or distributed. In addition, the explicit use of the term "processor" or "controller" should not be designed to refer exclusively to hardware capable of running software, and may include, without limitation, digital signal processor (DSP) hardware, read-only memory (ROM) for storage software, random access memory (RAM) and non-volatile storage.
    In this document, the terms "cell" or "base station" can be used interchangeably depending on the context. However, it must be kept in mind that a "cell" is technically not equivalent to a "base station". Cell refers to a radio coverage area and the base station refers to radio communication equipment that provides radio coverage for the corresponding coverage area.
    Exemplary radio communication equipment includes RBSes, Nodes B and eNós B in 3GPP, access points in WiFi or WLAN and base stations in WiMAX. A single device can support or serve multiple cells, typically by operating multiple antennas independently as one antenna per cell or a set of coordinated antennas for each cell. The cells can even overlap. However, it is assumed that each cell is individually identifiable, for example, each cell can have a global cell identity.
    Also in this document, 3GPP is primarily used as an example for the purpose of explanation. However, the scope of this disclosure is not limited to the set of 3GPP wireless network systems. Its scope may cover many domains of wireless network systems.
    To emphasize that aspects of the invention can be applied generically, the terms "CONNECTED" and "IDLE" will be used to denote some of the possible EU states. When a UE is in the CONNECTED state with the network, there is a wireless communication link established between the UE and the server cell. In addition, the UE is allowed to communicate only with the server cell, that is, only with the base station that corresponds to the server cell in the CONNECTED state. Thus, there is a context associated with the UE and the base station that is in control of the server cell. Such context may include the identity of the UE, parameters that characterize the radio link configuration, security parameters, etc. Thus, the UE and the base station are both configured to be engaged in communication.
    When in the Idle state, the UE is typically not fully prepared to be engaged in communication with the base station. In many cases, there is no UE context at any particular base station, but the context must be established before any data transmission can take place. Typically, and as described earlier, the location of UE is often not known at a cell level by the network, and the network must page the UE in a larger area when the network needs to reach the UE for communication purposes.
    It is noted above that mobility controlled by EU-assisted network combined as a long XRD cycle presents a tough challenge. That is, problems can arise when the UE is in the long DRX mode while also in the CONNECTED state. Long suspension periods are particularly problematic. This is illustrated in Figure 2, which shows a movement of a UE 230 that is assumed to be in the CONNECTED state with a base station 220 that corresponds to cell 210. The UE 230-1 represents the location of the UE 230 when it goes into suspension , that is, when it turns off its receivers, and UE 230-2 represents the location of the same UE 230 at the end of the suspension period.
    A specific problem arises when the UE 230 is in long DRX mode while in the CONNECTED state, the UE 230 is allowed to communicate with server cell 210 only, that is, it communicates only with server base station 220. However, the network may be aware of the situation of the UE during the long suspension period. Without this knowledge, the network is unable to deliver the UE 230 to a better cell. When the UE 230 awakens, it is no longer inside the serving cell 210, and thus is unable to communicate with the serving base station 220.
    This problem is conventionally addressed by allowing the UE 230 to select a better cell by itself when it detects a radio link failure. The UE 230, after trying to monitor the radio link with the server base station 220, will declare an RLF, and will take steps to reestablish connection with the network, for example, with the base station 250 that corresponds to cell 240. Thus, when the radio link failure occurs due to long periods of XRD, the conventional method provides a means of reestablishing the connection between the network and the UE. But, as noted, this conventional recovery process can take a significant amount of time during which the UE cannot transmit or receive any data.
    A direct solution to address this problem would be to implement more stringent measurement requirements for the UE when the UE is in long XRD mode. But, as previously mentioned, this could sacrifice battery preservation properties, which is the primary purpose of DRX functionality.
    The inventors of the present subject have recognized that, even when the UE is in the CONNECTED state, it is possible to achieve battery saving benefits that the DRX provides that include the long DRX mode and, at the same time, minimizes the time periods in which the EU remains unreachable. In other words, the methods of the invention, devices and systems reduce or eliminate the occurrences of the situation illustrated in Figure 2.
    Figure 3 illustrates a non-limiting embodiment of a UE 300, which includes, among others, a processing unit 310, a communication unit 320, a storage unit 330, a measuring unit 340, one or more timers 350 and optionally a 360 location unit, such as a GPS unit. The processing unit 310 is arranged to control other units 320, 330, 340, 350, 360 of the UE 300 to provide communications services to a user. The communication unit 320 can be arranged to communicate with cells in a wireless network and can include one or more wireless receivers (not shown) that can be turned on and off to conserve power. The storage unit 330 can be arranged to store information necessary for the operation of the UE and can also store code for the processing unit 310 to perform. The measuring unit 340 can be arranged to measure parameters related to radio signals such as signal strength, bit error rate and signal-to-noise ratio. Timers 350 can be arranged to govern periods of inactivity related to the DRX mode. The optional 360 location unit can be arranged to determine the location of the UE
    300. While individual units are illustrated in separate blocks, one or more units can be realized as an integrated unit and / or realized through various combinations of hardware, software and firmware components.
    In one or more non-limiting modalities, the UE 300 can be connected to a wireless network 400 as shown in Figure 4. The UE 300 can be in the CONNECTED state with the network 400 through base station 410, that is, the UE 300 it is prepared to send data to and receive data from base station 410 on wireless network 400. In 3SGPP, for example, the UE has an RRC connection to network 400. In addition to base station 410, network 400 can also include a radio network controller (RNC) 420 and a core network (CN) 430. Wireless networks are actually much more complex and include many nodes, but those are not illustrated for the sake of clarity.
    The UE 300 can be configured with a set of parameters that govern the behavior of the UE's DRX, so that the UE 300 can autonomously switch between different DRX modes. The parameter set can be stored on the storage unit 330. The UE 300 can be manufactured with standard parameters, which can be replaced or increased manually or through automated update procedures. Typically, the parameters are updated through signaling messages received by the network.
    The processing unit 310 can perform the necessary processing, in conjunction with other units, to autonomously switch the UE DRX mode
    300. Alternatively, the DRX mode can be explicitly signaled by network 400 and processing unit 310 can perform the processing necessary to respond to network signaling. The UE 300 can be configured to enter deeper "sleep modes" after long periods of UE inactivity. For example, the UE 300 deploys one or more timers 350 that govern the inactive part of the DRX period, so the UE 300 is allowed to use longer periods of DRX if a specific time has occurred since the last time the UE was active. In most cases, longer periods of XRD usually indicate longer periods of suspension and thus better conservation of power.
    It should be noted the distinction between UE activity / inactivity and the active / inactive part of the XRD period. UE activity refers to the UE that sends user data to and / or that receives user data from the network. As discussed above, the UE monitors the network's downlink control (DL) channel to determine whether any DL and / or UL data channel resources have been programmed for the UE. The possibility for the UE to send / receive user data refers to whether the UE is active or inactive.
    On the other hand, the active and inactive parts of the XRD period refer to the XRD cycle. Referring again to Figure 2, during the duration period, the UE monitors the downlink control channel to determine whether any user data channels have been programmed for the UE. Thus, the active part of DRX includes the period in duration. During the DRX opportunity period, the UE can enter sleep mode, that is, turn off its receivers. Thus, the inactive DRX portion may include some or all of the DRX opportunity period.
    The UE must wake up, that is, turn on its receivers, from time to time so that it can monitor the downlink control channel to receive the program information. It should be noted that the UE is not considered to be active when it awakens to monitor the downlink control channel during the active part of XRD.
    Referring again to Figure 4, examples of timers 350 that can be deployed include, among others, a Duration Timer that governs how many consecutive subframes the UE must monitor the downlink control channel at the start of a DRX cycle, a DRX Timer DRX inactivity that governs the number of consecutive subframes that the UE must monitor the downlink control channel after successfully decoding a programming command for an initial UL or DL user data transmission, a DRX Relay Timer that governs the maximum number of consecutive subframes during which the UE can expect a DL retransmission, and a DRX Short Cycle Timer that governs the time or a number of subframes that the UE must follow the Short DRX cycle.
    Figure 5 illustrates an exemplary non-limiting method 500 that can be performed by UE 300, which is in the CONNECTED state with network 400 via base station 410. In method 500, processing unit 310 can compare an XRD parameter to a DRX limit listed in step 510 and step 520, processing unit 310 can determine whether the DRX parameter is at or below the DRX limit. If the parameter is at or below the limit, then processing unit 310 can apply the network-controlled mobility mode in step 530. If the DRX parameter is above the DRX limit, then processing unit 310 can apply mode UE controlled mobility in step 540. Here, "apply" the network or UE controlled mobility mode is intended to convey that the UE enters, that is, switches to, the applied mode if it was not in the applied mode previously.
    When the UE controlled mobility mode is applied in step 540, it is preferable that the UE remains in the CONNECTED state. For example, the UE at a fixed location can remain in the CONNECTED state. In times of low activity, the UE can cease or significantly reduce the performance of power consumption measurements, even if the location is on a cell edge. By remaining in the CONNECTED state, the UE can start sending and receiving data as soon as some data arrives.
    The DRX parameter compared in step 510 can be the DRX period of the UE. As noted above, long cycles of XRD are usually associated with long periods of suspension. Referring again to the Figures | and 2, the DRX limit is preferably adjusted so that when the UE's DRX period is at or below the limit, the UE probably will not have left server cell 210 before waking up. As long as the UE is inside the server cell, radio link failure is unlikely and mobility controlled by network decisions can be done reliably.
    Since radio link failure is unlikely, the amount of time that the UE is unreachable is minimized. The UE would be unreachable essentially only for the duration of the inactive part of the DRX period, that is, the opportunity part of DRX as seen in Figure 1.
    However, if the UE DRX period is over the limit, indicating a relatively long DRX opportunity, there is a greater likelihood that, when it wakes up next, the UE 300 may be outside the serving cell. When applying the UE controlled mobility mode, the UE 340 measurement unit can take measurements of the radio signals in the vicinity and the processing unit 310 can select the best cell based on the measurement results.
    With reference to Figure 2, if the current server cell 210 happens to be the best cell, then no reconnection processing is necessary.
    If server cell 210 is not detected or is not the best cell, processing unit 310 can perform a cell reselection process to establish connection with the best cell selected as cell 240 via communication unit 320. By allowing the UE 300 applies the UE controlled mobility mode, the process of monitoring the connection to the server cell 210, detecting and declaring RLF, and performing associated recovery procedures, can be avoided even when the UE 300 wakes up outside the server cell 210 This again minimizes the amount of time the UE 300 is unreachable on the network.
    In addition, the long period of XRD can be maintained, which in turn maintains the battery saving benefits of XRD.
    Other parameters can be used as the XRD parameter.
    For example, the duration of the inactive part of XRD can be used.
    If the inactive part of XRD is short, network-controlled mobility can be applied.
    If the inactive part of XRD is long, network-controlled mobility can be applied.
    The dividing line, that is, the limit, can be set to a predetermined value to determine whether the inactive part of XRD is short or long.
    As another example, the duration since the last active UE time, for example, since the last time that UE sent or received user data or was scheduled to send or receive user data, can be used as the XRD parameter.
    In another alternative, even if the DRX parameter such as the DRX cycle is determined to be above the limit in step 520, if the UE 300 is not moving away from the base cell of the serving cell, then processing unit 310 can also apply the network-controlled mobility mode.
    In this alternative, the UE controlled mobility mode is applied when the XRD parameter is above the limit and the UE is moving away.
    This is illustrated in Figure 5 with decision step 550 and connection flow lines in dashes.
    Whether or not the UE is moving away from the serving base station, in the radio or physical direction, the same can be inferred through differences in the signal strength transmitted by the base station and the signal strength received by the UE or vice versa .
    If the UE includes a 360 tracking unit, whether or not it is moving away can be explicitly determined.
    In yet another alternative, the parameter compared in step 520 may be the proximity of the UE to a boundary of the server cell.
    Based on the geographic distribution of the base stations, as well as the base station's configuration as the maximum transmit power of the base station, cell boundaries can be determined with a reasonably reliable degree of accuracy. If the UE 300 is located close to the server cell boundary, for example, based on the location determined by the GPS 360 unit or relative equivalence in radio signal qualities of base stations received by the UE, the mobility mode controlled by UE can be applied.
    Instead of the proximity to the border cell, the distance from the server base station can be used as a comparison parameter, also called the XRD parameter. Furthermore, the UE movement, for example, as determined in decision step 550, can be considered together with the proximity or distance of the comparison parameters, as defined above.
    Note that if the proximity to the cell boundary is used as the benchmark, the decision criteria in step 520 must be reversed. That is, the EU-controlled mobility mode should be applied when the distance to the border is less than or equal to a boundary distance. Certainly, an inverse of the proximity parameter can be used as the comparison parameter and the same criteria can be used, that is, the criteria need not be reversed in this case.
    Thus, it should be noted that, depending on the particular criteria used, one side of the limit will logically point to the EU controlled mobility being applied and the other side will point to the network controlled mobility being applied. The invention fully contemplates that, depending on the criteria used, the comparison in step 520 can be reversed. Thus, step 520 must be taken in that inclusive sense and the particular comparison in illustrated step 520 is provided merely as a matter of convenience.
    In one embodiment, processing unit 310 can adjust the DRX parameter depending on the level of UE activity. Again, it emphasizes that the activity level of the UE 300 depends on whether the UE 300 is being, or has been programmed by the base station 410, either on the uplink or downlink. The UE that monitors the downlink control channel to determine whether or not it has been programmed is not considered to be an activity for the purpose of determining the level of UE activity. In addition, the UE is not considered as programmed, if the UE autonomously reads the downlink control channel to find information disseminated as paging or system information. Thus, a reading of a paging channel or a broadcast channel by the UE would not typically affect the subsequent activity level of the UE.
    In this mode, if the UE is not programmed, and has not been programmed for a timeout amount, the UE can reduce its monitoring of the downlink control channel to preserve battery resources. The XRD period can be extended by a predetermined amount of time in this case.
    If resources are programmed, for example, base station 410 indicates that data is available for the UE 300, the DRX period can be shortened by the same or different predetermined quantities or can be set to a standard duration as future resource programming it is likely for the EU 300. Depending on the amount of programmed resources, the UE 300 can be configured to operate in non-DRX mode.
    In another example, the user's activities, for example, the user enters a text message, can trigger more activities of the UE 300, and thus changes in the XRD parameter may be desirable.
    The DRX parameter setting is indicated as step 560 in Figure 5. This step is shown as a box drawn to indicate that the step is optional.
    In addition, the step is not connected to any of steps 510 to 550 to indicate that the DRX parameter can be adjusted separately from the steps to determine whether the UE should be on the network or in UE controlled mobility mode.
    Note that, in step 560, the limit value for the XRD parameter can also be adjusted, for example, on a cell-by-cell basis.
    As an illustration, where there are many base stations in a given geographic area, for example, a business district in the city center, the coverage area for an individual base station - that is, the cell area - can be relatively small.
    Conversely, where there are few base stations, for example, in rural settings, each cell area can be relatively large.
    A moving EU will require less time to move in a neighboring cell when the current cell size is relatively small, and conversely will require more time when the cell size is large.
    The value limits may differ from cell to cell.
    Even inside a cell, the value limits can be configured differently for different UEs.
    A fast-moving UE, for example, that of a user in a car, will take less time than a slow-moving UE, for example, that of a user walking, to reach the neighboring cell.
    The speed of movement can be inferred by measuring signal power levels over time - a greater change indicates greater speed - or it can be explicitly determined, for example, through the GPS 360 unit. Thus, in one mode, the limits of values can be adjusted on a cell-by-cell basis, as well as on an EU-by-EU basis.
    Adjustments to XRD parameters and / or limits can be performed by the UE by themselves or the network can signal the UE to make appropriate adjustments taking into account the specific capacities and circumstances of the UE.
    In steps 510 and 520, a single XRD parameter is compared to a threshold and the decision to apply the EU-controlled network or mobility is made.
    Similarly, in the step
    560, a single parameter and / or limit value is set. However, the invention is not limited in this way. It is fully contemplated that multiple parameters can be considered in steps 510 and 520, and multiple parameters can be adjusted in step 560. Regardless of whether a parameter or combination of parameters is used, appropriate decision criteria must be provided in step 520 so that if step 530 is taken, a reliable network-controlled mobility service can be provided. Otherwise, the EU-controlled mobility mode must be applied, step
    540. Decision criteria can be based on a single parameter value, a sum of multiple parameter values, a weighted sum of multiple parameter values, and so on.
    In one embodiment, when EU-controlled mobility is applied, i.e., processing unit 310 performs step 540, processing unit 310 can reselect a cell among a set of identified cells. Processing unit 310 can identify cells based on measurements of radio signals from the serving cell and neighboring cells made via measurement unit 340. In a preferred alternative, a set of neighboring cells can be provided over the network via communication between base station 410 and communication unit 320 when UE 300 first establishes connection with the corresponding cell. This allows the UE 300 to specifically search for those cells that result in the most efficient reselection.
    When cell reselection is performed, processing unit 310 preferably updates the network via communication unit 320 in a cell update message or a reconnection request message. For the sake of simplicity, "update message" will be used to refer to the cell update or the reconnection request message. The update message may include an indication that the update message is caused by the UE in the CONNECTED state and in UE controlled mobility mode that performs cell reselection. The update message, furthermore, may include information related to the connection that the UE had with the network before the cell reselection. These "previous connection information" may include a Temporary Cell Radio Network Identifier (C-RNTI) from the UE . The previous connection information may also include a cell identity (cell ID) and / or the base station identity (base station ID) of the previous server cell.
    On the network side, when the update message is received from the UE through the base station, the network can play a method to find the UE context associated with the UE that sends the message. Referring again to Figure 2, base station 250 of cell 240 can receive the update message from UE 230.
    Figure 6 illustrates a non-limiting method 600 that can be performed by base station 410 to find the context of UE 230. In step 610, base station 410 receives an update message from UE 230. In step 620, base station 410 identifies the previous server cell based on the update message. For example, the update message may include the previous connection information discussed above. In step 630, base station 410 then retrieves the UE context from the network node or base station to which the UE was connected in the previous server cell, that is, during the previous connection. In one embodiment, the UE context can contain the same information used during a normal prepared handover. It should be noted that the network can accept or reject the UE to remain in the CONNECTED state after cell reselection. If the network accepts that the UE remains in the CONNECTED state, the connection is reestablished with the network node, for example, the base station 410. If the network rejects that the UE remains in the CONNECTED state after cell reselection, the UE must go to the STANDING state and no connection is established or reestablished.
    While method 600 is described as being performed by base station 410, it should be noted that other network nodes such as RNC 420 or nodes within CN 430 may be involved in the method. In another embodiment, the RNC 420 or other network nodes can perform the method and the base station 410 acts as a conductor for exchanging messages between the UE and the network nodes.
    Figure 7 illustrates a non-limiting embodiment of a network node 700 that performs method 600. Node 700 may include, among others, a processing unit 710, a communication unit 720, and a storage unit
    730. Processing unit 710 may be arranged to control communication and storage unit 720, 730 to provide mobility enhancement services for UEs. The communication unit 720 can be arranged to communicate with UEs directly, for example, if the network node is the base station, or indirectly through the base station. Storage unit 730 can be arranged to store information necessary for the operation of node 700 and can also store code for processing unit 710 to perform. Although the units are illustrated in separate blocks, one or more units can be realized as an integrated unit and / or realized through various combinations of hardware, software and firmware components.
    It was discussed above that a UE at a cell boundary is problematic in that repeated measurement reports can be triggered. Whenever a measurement report is triggered, the UE leaves the DRX mode. Thus, triggering repeated reporting can have a significant undesired effect in terms of power consumption. Figure 8 illustrates a non-limiting method 800 performed by the UE, which is in a state
    CONNECTED with the network, to address this situation. In method 800, processing unit 310 can compare a DRX parameter to a DRX limit listed in step 810 and can determine whether the DRX parameter is at or below the DRX limit in step 820. If yes, the Processing 310 can deploy a first measurement setup at step 830. For example, processing unit 310 can take measurements of neighboring cell signals provided by measurement unit 340, and send measurement reports to server base station 410 via communication unit 320 to assist the network when making handover or cell reselection decisions.
    On the other hand, if in step 820 it is determined that the DRX parameter is above the DRX limit, then in step 840, processing unit 310 can implement a second measurement configuration. For example, the second measurement setup may include less measurement taking and / or reporting, or omitting measurement reporting and / or reporting altogether.
    With method 800, the UE in a long XRD mode does not need to provide repeated measurement reports when it is close to the cell boundary or intersection. The UE can select and remain with the best cell. This has the added benefit of reducing interference caused in a neighboring cell by the UE that tries to send measurement reports outside of the server cell coverage.
    Note that the XRD parameter compared in method 800 can be the same or different from the XRD parameter compared in method 500. Even if the same XRD parameter is used in both methods, the value limits need not be the same. In addition, while only two measurement configurations are illustrated, the number of measurement configurations that can be implemented is not limited in this way. In one embodiment, it is preferred that, for each measurement configuration, a frequency of measurements taken and reported is commensurate with the UE's DRX period. In another mode, the UE in the EU-controlled mobility mode may omit the measurement report as a whole. However, the UE in the EU-controlled mobility mode can still take measurements to perform cell reselection.
    There are numerous advantages to the disclosed technology. A non-exhaustive list of these benefits includes: - Long interruptions due to the combination of long XRD and network-controlled mobility are avoided or significantly reduced; - long DRX in CONNECTED state can be applied to UEs with little to - no risk of losing connectivity to the UEs; and - Fewer measurement reports and better power preservation capabilities for UEs that are located near cell intersections and cell edges.
    Although the above description contains many specific descriptions, these should not be construed as limiting the scope of the invention, but designed as merely providing illustrations of some of the presently preferred embodiments of that invention.
    Therefore, it will be appreciated that the scope of the present invention completely covers other modalities that may become obvious to those skilled in the art, and that the scope of the present invention should therefore not be limited.
    All structural and functional equivalents to the elements of the preferred modality described above that are known to those of ordinary skill in the art are expressly incorporated into this document by reference and are intended to be covered by this document.
    Furthermore, it is not necessary for a device or method to treat each and every problem described in this document or to have its solution sought by the present technology, so that it is covered by this document.
    权利要求:
    Claims (26)
    [1]
    1. Method (500) of operating a user equipment (UE) (300) in a DRX mode and in a CONNECTED state with a base station (410) of a wireless network (400), method (500) characterized by the fact that it comprises: determination (510, 520) by the UE (300) of whether an XRD parameter of the UE (300) is at or below an XRD limit; application (530) by the UE (300) of a network controlled mobility mode when the DRX parameter is at or below the DRX limit; and application (540) by the UE (300) of an EU controlled mobility mode when the DRX parameter is above the DRX limit, in which when the network controlled mobility mode is applied, the network (400) controls a handover of the UE (300) from one cell to another, and when the UE controlled mobility mode is applied, the UE (300) is allowed to autonomously perform cell reselection, further comprising the adjustment (560) by UE (300) of the XRD parameter based on an activity level of the UE (300).
    [2]
    2. Method (500), according to claim 1, characterized by the fact that the XRD parameter is any combination of a XRD period, an inactive XRD part and a time since the programming of the last activity of the UE (300 ).
    [3]
    3. Method (500) according to claim 1, characterized by the fact that the UE (300) extends a period of XRD when programming information from the base station (410) indicates that no resources are programmed for the UE (300) ) and shortens the XRD period when the scheduling information indicates that resources are scheduled for the UE (300).
    [4]
    4. Method (500) according to claim 1, characterized by the fact that, when the UE controlled mobility mode is applied, the UE (300) reselects a cell among a set of identified cells.
    [5]
    5. Method (500) according to claim 4, characterized by the fact that the set of identified cells is identified by the UE (300) by measuring signals - waste of a serving cell and neighboring cells, or is a set of neighboring cells received from the base station (400), or both.
    [6]
    6. Method (500), according to claim 4, characterized by the fact that the UE (300) updates the network in an update message after cell reselection, the update message being an update message from cell or a - reconnect request message.
    [7]
    7. Method (500) according to claim 6, characterized in that the update message comprises an indication that the update message is sent due to the UE (300) performing cell reselection while the UE (300) ) is in the CONNECTED state and EU-controlled mobility mode.
    [8]
    8. Method (500) according to claim 6, characterized in that the update message comprises previous connection information from the UE (300) comprising any one or more of a UE C-RNTI, a cell ID of a previous server cell and a base station ID of the previous server cell.
    [9]
    9. Method (600) of operating a network node (410, 420, 430) of a wireless network (400), the method (600) characterized by the fact that it comprises: reception (610), by the network node (410, 420, 430), an update message from a UE (300) that performs cell reselection, the update message being a cell update message or a connection reconnection request message ; identification (620), by the network node (410, 420, 430), of a previous server cell of the UE (300) based on the update message; and recovery (630), by the network node (410, 420, 430), of an UE context of the UE (300) from the previous server cell, where: the UE update message (300) indicates that the UE (300) sent the update message due to the UE (300) performing cell reselection while the UE (300) was in a CONNECTED state with the previous server cell and in an EU controlled mobility mode.
    [10]
    10. Method (600) according to claim 9, characterized by the fact that the UE context comprises the same information used during a normal prepared handover.
    [11]
    11. Method (600), according to claim 9, characterized by the fact that method (600) further comprises the network node (410, 420, 430) rejecting or granting that the UE (300) remains in the CONNECTED state after cell reselection.
    [12]
    12. Method (800) of operating a UE (300) in a CONNECTED state with a base station (410) of a wireless network (400) and in an XRD mode, the method (800) characterized by the fact that comprises: determination (810, 820), by the UE (300), of whether an XRD parameter of the UE (300) is at or below an XRD limit; implantation (830) by the UE of a first measurement configuration of supplying measurement reports of neighboring cells to the base station (410) when the XRD parameter is at or below the XRD limit; and implantation (840), by the UE, of a second measurement configuration, of less frequent supply of measurement reports from neighboring cells to the base station (410) in relation to the first measurement configuration or no measurement report when the measurement parameter DRX is above the DRX limit.
    [13]
    13. Method (800), according to claim 12, characterized by the fact that the XRD parameter is any combination of a XRD period, an inactive XRD part, and a time since the programming of the last UE activity ( 300).
    [14]
    14. User equipment (UE) (300) for communication with a wireless network (400), the UE (300) characterized by the fact that it comprises: a processing unit (310) arranged to perform processing to operate the UE ( 300) to provide communication services to a user; a communication unit (320) arranged to communicate with the wireless network (400), wherein the communication unit (320) comprises one or more wireless receivers that can be turned on and off; a storage unit (330) arranged to store information necessary for operation of the UE (300) and arranged to store code for the processing unit (310) to perform; and a measurement unit (340) arranged to measure parameters related to radio signals, where: the processing unit (310) controls the communication unit (320), the storage unit (330), and the measurement unit (340) to provide communication services to the user, and when the UE (300) is in a CONNECTED state with a base station (410) of the wireless network (400) and is operating in a DRX mode, the unit processing (310) is willing to: determine whether a UE DRX parameter (300) is at or below a DRX limit, when the DRX parameter is at or below the DRX limit, apply a controlled mobility mode per network in which the network (400) controls a UE handover (300) from one cell to another, and when the DRX parameter is above the DRX limit, apply an EU controlled mobility mode in which the UE (300) autonomously performs cell reselection, in which the processing unit is arranged to adjust the XRD parameter based on an activity level of the UE (300).
    [15]
    15. UE (300), according to claim 14, characterized by the fact that the DRX parameter is any combination of a DRX period, an inactive part of DRX and a time since the programming of the last activity of the UE (300).
    [16]
    16. UE (300) according to claim 14, characterized by the fact that the processing unit (310) extends a period of XRD when programming information from the base station (410) indicates that no resources are programmed for the UE (300), and shortens the XRD period when programming information indicates that resources are scheduled for the UE (300).
    [17]
    17. UE (300) according to claim 14, characterized in that, when the EU-controlled mobility mode is applied, the processing unit (310) reselects a cell among a set of identified cells.
    [18]
    18. UE (300) according to claim 17, characterized by the fact that the set of identified cells is identified by the processing unit (310) based on measurements of radio signals from a serving cell and from neighboring cells performed by the measurement unit (340), or is a set of neighboring cells received by the communication unit (320) from the base station (400), or both.
    [19]
    19. UE (300), according to claim 17, characterized by the fact that the processing unit (310) updates the network in an update message via the communication unit (320), the update message being it is a cell update message or a reconnection request message.
    [20]
    20. UE (300) according to claim 19, characterized in that the update message comprises an indication that the update message is sent due to the UE (300) performing cell reselection while the UE (300) ) is —on the CONNECTED state and in EU controlled mobility mode.
    [21]
    21. UE (300) according to claim 19, characterized in that the update message comprises previous connection information from the UE (300) comprising any one or more of a UE C-RNTI, a cell ID of a previous server cell and a base station ID of the previous server cell.
    [22]
    22. Network node (700) of a wireless network (400), characterized by the fact that it comprises: a processing unit (710) arranged to provide mobility enhancement services for a UE (300); a communication unit (720) arranged to communicate with the UE (300); and a storage unit (730) arranged to store information necessary for operation of the network node (700) and arranged to store code for the processing unit (710) to execute, wherein: the processing unit (710) controls the unit communication unit (720) and the storage unit (730), when the communication unit (720) receives an update message from the UE (300) which performs cell reselection, the processing unit (710) is arranged to:
    identify a previous UE cell server (300) based on the update message, and retrieve a UE UE context (300) from the previous server cell, and the update message, which is a cell update message or a reconnect request message from the UE (300) indicates that the UE (300) sent the update message due to the UE (300) performing cell reselection while the UE (300) was in a state CONNECTED to the previous server cell and in an EU-controlled mobility mode.
    [23]
    23. Network node (700) according to claim 22, characterized by the fact that the UE context comprises the same information used during a normal prepared handover.
    [24]
    24. Network node (700) according to claim 22, characterized in that the processing unit (710) is arranged to reject or allow the UE (300) to remain in the CONNECTED state after cell reselection.
    [25]
    25. User equipment (UE) (300) for communication with a wireless network (400), the UE (300) characterized by the fact that it comprises: a processing unit (310) arranged to perform processing to operate the UE ( 300) to provide communication services to a user; a communication unit (320) arranged to communicate with the wireless network (400), wherein the communication unit (320) comprises one or more wireless receivers that can be turned on and off; a storage unit (330) arranged to store information necessary for operation of the UE (300) and arranged to store code for the processing unit (310) to perform; and a measurement unit (340) arranged to measure parameters related to radio signals, where: the processing unit (310) controls the communication unit (320), the storage unit (330), and the measurement unit (340) to provide communication services to the user, and when the UE (300) is in a CONNECTED state with a base station (410) of the wireless network (400) and is operating in an XRD mode, the processing (310) is willing to: determine if a UE's DRX parameter (300) is at or below a DRX threshold, deploy a first metering configuration to provide measurement reports from neighboring cells to the base station (410 ) when the
    DRX is at or below the DRX limit, and deploy a second measurement configuration, providing less frequent measurement reports from neighboring cells to the base station (410) compared to the first measurement configuration or no measurement report when the DRX parameter is above the DRX limit.
    [26]
    26. UE (300), according to claim 25, characterized by the fact that the XRD parameter is any combination of a XRD period, an inactive XRD part and a time since the programming of the last activity of the UE (300 ).
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    法律状态:
    2020-09-01| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04W 36/34 , H04W 24/10 , H04W 52/00 , H04W 76/04 Ipc: H04W 36/36 (2009.01), H04W 36/08 (2009.01), H04W 3 |
    2020-09-01| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-15| B11B| Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements|
    2021-11-23| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    US12/711,799|2010-04-30|
    US12/771,799|US8688119B2|2010-04-30|2010-04-30|Method, apparatus and system for mobility enhancement in DRX|
    PCT/SE2011/050351|WO2011136716A1|2010-04-30|2011-03-29|Method, apparatus and system for mobility enhancement in drx|
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