CN104811953B - Method for coverage enhancement mode MTC user equipment measurement control - Google Patents
Method for coverage enhancement mode MTC user equipment measurement control Download PDFInfo
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Abstract
The invention discloses a method for measurement control of a coverage enhancement mode MTC user equipment, which comprises the step of judging a measurement period according to a threshold value of a relative value of a received signal level for cell selection and a threshold value of a relative value of a received signal quality for cell selection of the MTC user equipment for the coverage enhancement mode. In the idle state, when the relative value of the received signal level for cell selection is greater than its threshold value and the relative value of the received signal quality for cell selection is greater than its threshold value, the existing measurement period is extended and the measurement is performed, otherwise the measurement is performed according to the existing measurement period. In the connected state, when the level signal measurement value of the serving cell is greater than the quality threshold, the measurement period is extended and the measurement is performed. The extension of the measurement period can reduce unnecessary neighbor cell measurement to save the power of the coverage enhancement mode MTC ue, and also more efficiently discover and select a more suitable cell as a serving cell.
Description
Technical Field
The present invention relates to the field of mobile communication, and more particularly, to a method for coverage enhancement mode MTC user equipment measurement control in the field of mobile communication.
Background
One of the goals of work items on low-cost and Coverage Enhanced (CE) Machine Type Communication (MTC) User Equipment (UE) that have recently started in LTE Release-12 (LTE) is to standardize Coverage enhancement corresponding to 15 dB. Where the RAN2 needs to evaluate the potential impact of existing mobility management functions on CE-MTC user equipment performance and further consider whether existing mobility management functions need to be modified for CE-MTC user equipment.
When performing cell selection, a user equipment with normal coverage usually needs to search for a suitable cell to camp on. According to 3GPP TS36.304, a suitable camping cell needs to meet the following cell selection criteria:
Srxlex> 0 and Squal＞0 (1)
Wherein
Srxlev=Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation(2)
Squal=Qqualmeas-Qqualmin+Qqualminoffset) (3)
For convenience of explanation of the meaning of formula (1), the parameters referred to in formulae (1) to (3) will now be explained. Wherein SrxlevA relative value (dB) representing a received signal level for cell selection; squalA relative value (dB) representing the received signal quality for cell selection; qrxlevmeasRepresentative cell received signal level measurement (RSRP) (dBm); qqualmeasRepresents a serving cell received signal quality measurement (dB); qrxlevminA minimum received signal level value (dBm) required on behalf of the serving cell; qqualminRepresents a minimum received signal quality value (dB) required by the serving cell; qrxlevminoffsetCalculation S represents when a user equipment normally residing in a normal coverage area of a visited PLMN periodically searches for a higher ranking PLMNrxelvWhen the Q is required to be broadcasted for the networkrxlevAn additionally added offset; qqualminoffsetCalculation S represents when a user equipment normally residing in a normal coverage area of a visited PLMN periodically searches for a higher ranking PLMNqualWhen Q is required to be broadcast to the networkqualminAn additionally added offset; pcompensationTo compensate for the level value (dB), it is calculated by the formula max (P)EMAX-PPowerClass0) (dB); wherein P isEMAXAn uplink maximum transmission power value (dBm) of user equipment in a normal coverage range allowed by a serving cell; pPowerClassRepresenting a maximum radio frequency output power value (dBm) of the user equipment in the normal coverage range determined according to the power class of the user equipment in the normal coverage range; qrxlevmin，Qrxlevminoffset，Qqualmin，QqualminoffsetAnd PcompensationTypically broadcast by a network, such as a base station. The user equipment with normal coverage area is related to the network broadcastNumber to calculate SrxlevAnd SqualTo determine whether the current cell is suitable to continue as a serving cell in idle mode. QrxlevminoffsetAnd QqualminoffsetServing cell selection is only applicable when a user equipment normally camped on a normal coverage area of a visited PLMN periodically searches for a higher priority PLMN.
Calculating S of non-serving cell for reselection of serving cellrxlevAnd SqualThe normal coverage user equipment in idle state should use the parameters provided by the serving cell. The user equipment in normal coverage of the idle state employs the following rules to limit the required measurements:
if the serving cell satisfies S at the same timerxlev＞SIntraSearchPAnd Squal＞SIntraSearchQThe user equipment in the normal coverage area can choose not to execute the same-frequency adjacent cell measurement, otherwise, the user equipment in the normal coverage area should execute the same-frequency adjacent cell measurement;
if the serving cell satisfies S at the same timerxlev＞SnonIntraSearchPAnd Squal＞SnonIntraSearchQThe normal coverage ue may choose not to perform inter-frequency (inter-frequency) or inter-system (inter-RAT) cell measurement in the same or lower priority E-UTRAN, otherwise, the normal coverage ue should perform inter-frequency or inter-system cell measurement in the same or lower priority E-UTRAN; in which a control parameter S is measuredIntraSearchP、SIntraSearchQ、SnonIntraSearchPAnd SnonIntraSearchQThe base station sends the system information to the user equipment with normal coverage in a broadcasting mode. SIntraSearchPSpecifying S for performing co-frequency neighbor cell measurementsrxlevA threshold value of (d); sIntraSearchQSpecifying S for performing co-frequency neighbor cell measurementsqualA threshold value of (d); snonintraSearchPDefining S for performing inter-frequency or inter-system measurements of EUTRANrxlevA threshold value of (d); snonintraSearchQDefining S for performing inter-frequency or inter-system measurements of EUTRANqualThe threshold value of (2).
When the normal coverage user equipment is in a Connected Mode (RRC-Connected Mode), the base station provides the measurement configuration to the normal coverage user equipment through dedicated signaling. The s-Measure is a quality threshold of a Primary Cell (PCell) and is used to control whether the ue in normal coverage needs to perform measurements between co-frequency, inter-frequency and inter-system. The s-measurement is usually configured by the base station through Radio Resource Control (RRC) signaling and when the received signal level measurement of the primary serving cell exceeds the s-measurement, the ues in the normal coverage area may stop performing measurements between the same frequency, different frequency and different systems. In the connected mode, the base station configures an s-Measure value for the user equipment with normal coverage.
However, the existing measurement control mechanism in LTE described above is designed for user equipments in normal coverage in idle and connected mode. CE-MTC user equipment is not suitable for using existing measurement rules designed for normal coverage user equipment. For example, S broadcasted for normal coverage user equipmentIntraSearchPAnd SIntraSearchQAnd SnonIntraSearchPAnd SnonIntraSearchQMay not be suitable for CE-MTC user equipment in coverage enhancement. Furthermore, since CE-MTC ues may receive a signal with a much lower strength or quality than that of normal coverage ues. If the CE-MTC user equipment adopts the same rules as the user equipment of normal coverage, then the CE-MTC user equipment will also stop performing measurements when the serving cell meets certain conditions, but this may not be a desirable result. In consideration of the characteristics of CE-MTC user equipment, it is necessary to modify and enhance the existing measurement control mechanism in idle mode and connected mode to design a measurement control mechanism for CE-MTC user equipment.
Disclosure of Invention
In light of the above understanding of the background and the existing technical problems, it would be advantageous to provide a method for measurement control for CE-MTC user equipment.
According to a first aspect of the present invention, there is provided a method for measurement control in a wireless communication network, comprising the following steps performed by a coverage enhancement mode MTC user equipment in the wireless communication network: calculating a relative value of a received signal level for cell selection and a relative value of a received signal quality for cell selection; receiving a first threshold value, a second threshold value, a third threshold value and a fourth threshold value from a base station, wherein the first threshold value represents a threshold value of a relative value of the received signal level for cell selection, which is measured by the MTC user equipment in the coverage enhancement mode on the same-frequency adjacent cells; the second threshold represents a threshold of a relative value of the received signal quality for cell selection for the same-frequency neighbor cell measurement performed by the coverage enhancement mode MTC user equipment; the third threshold represents a threshold of a relative value of the received signal level for cell selection for the inter-frequency measurement or inter-system measurement performed by the coverage enhancement mode MTC user equipment; the fourth threshold represents a threshold of a relative value of the received signal quality for cell selection for the inter-frequency measurement or the inter-system measurement performed by the coverage enhancement mode MTC user equipment; and determining a measurement period based on the first threshold value, the second threshold value, the third threshold value, and the fourth threshold value from the base station, and the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection: extending a first measurement period and performing the same-frequency neighbor cell measurement when the relative value of the received signal level for cell selection is greater than the first threshold and the relative value of the received signal quality for cell selection is greater than the second threshold; extending a second measurement period and performing the inter-frequency measurement or the inter-system measurement of the same or lower priority when the relative value of the received signal level for cell selection is greater than the third threshold and the relative value of the received signal quality for cell selection is greater than the fourth threshold.
According to an embodiment of the present invention, further comprising performing the same-frequency neighbor cell measurement according to the first measurement period when the relative value of the received signal level for cell selection is less than or equal to the first threshold or the relative value of the received signal quality for cell selection is less than or equal to the second threshold; performing the same or lower priority inter-frequency measurement or inter-system measurement according to the second measurement period when the relative value of the received signal level for cell selection is less than or equal to the third threshold or the relative value of the received signal quality for cell selection is less than or equal to the fourth threshold.
According to an embodiment of the present invention, the first measurement period is preset by the wireless communication network and used for intra-frequency neighbor cell measurement of a normal coverage user equipment, and the second measurement period is preset by the wireless communication network and used for inter-frequency or inter-system measurement of the normal coverage user equipment.
According to an embodiment of the present invention, the method further includes obtaining a received signal level measurement value of a serving cell of the coverage enhancement mode MTC user equipment and a received signal quality measurement value of the serving cell.
According to an embodiment of the present invention, the step of calculating the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection further comprises calculating the relative value of the received signal level for cell selection based on a minimum received signal level value required by the serving cell from the base station, an offset and a compensation level value of the minimum received signal level value required, and the received signal level measurement value; and calculating the relative value of the received signal quality for cell selection based on the minimum received signal quality value required for the serving cell from the base station and the offset of the minimum signal quality value required and the received signal quality measurement value.
According to one embodiment of the invention, the coverage enhanced MTC user equipment is in an idle state.
According to a second aspect of the present invention, there is provided a method for measurement control in a wireless communication network, comprising the following steps performed by a base station in the wireless communication network: sending a first threshold value, a second threshold value, a third threshold value and a fourth threshold value to the MTC user equipment in a coverage enhancement mode, wherein the first threshold value represents a threshold value of a relative value of the received signal level for cell selection, which is measured by the MTC user equipment in the coverage enhancement mode in a same-frequency adjacent cell; the second threshold represents a threshold of a relative value of the received signal quality for cell selection for the same-frequency neighbor cell measurement performed by the coverage enhancement mode MTC user equipment; the third threshold represents a threshold of a relative value of the received signal level for cell selection for the inter-frequency measurement or inter-system measurement performed by the coverage enhancement mode MTC user equipment; the fourth threshold represents a threshold of a relative value of the received signal quality for cell selection for the inter-frequency measurement or the inter-system measurement performed by the coverage enhancement mode MTC user equipment; sending a minimum receiving signal level value required by a serving cell of the coverage enhancement mode MTC user equipment, an offset of the minimum receiving signal level value required by the serving cell and a compensation level value of the serving cell to the coverage enhancement mode MTC user equipment; and sending the minimum received signal quality value required by the serving cell and the offset of the minimum received signal quality value required by the serving cell to the MTC user equipment in the coverage enhancement mode.
According to a third aspect of the present invention, there is provided a method for measurement control in a wireless communication network, comprising the following steps performed by a coverage enhancement mode MTC user equipment in the wireless communication network: calculating a relative value of a received signal level for cell selection and a relative value of a received signal quality for cell selection; receiving a first threshold value, a second threshold value, a third threshold value and a fourth threshold value from a base station, wherein the first threshold value represents a threshold value of a relative value of the received signal level for cell selection, which is measured by the MTC user equipment in the coverage enhancement mode on the same-frequency adjacent cells; the second threshold represents a threshold of a relative value of the received signal quality for cell selection for the same-frequency neighbor cell measurement performed by the coverage enhancement mode MTC user equipment; the third threshold represents a threshold of a relative value of the received signal level for cell selection for the inter-frequency measurement or inter-system measurement performed by the coverage enhancement mode MTC user equipment; the fourth threshold represents a threshold of a relative value of the received signal quality for cell selection for the inter-frequency measurement or the inter-system measurement performed by the coverage enhancement mode MTC user equipment; and determining whether to perform measurement according to the first threshold value, the second threshold value, the third threshold value, and the fourth threshold value received from the base station, and the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection: when the relative value of the received signal level for cell selection is greater than the first threshold and the relative value of the received signal quality for cell selection is greater than the second threshold, not performing intra-frequency cell-to-cell measurement, otherwise performing intra-frequency cell-to-cell measurement according to a first measurement period; when the relative value of the received signal level for cell selection is greater than the third threshold and the relative value of the received signal quality for cell selection is greater than the fourth threshold, the same or lower priority inter-frequency measurement or inter-system measurement is not performed, and otherwise the same or lower priority inter-frequency measurement or inter-system measurement is performed according to a second measurement period.
According to an embodiment of the present invention, the first measurement period is preset by the wireless communication network and used for intra-frequency neighbor cell measurement of the user equipment in the normal coverage area, and the second measurement period is preset by the wireless communication network and used for inter-frequency or inter-system measurement of the user equipment in the normal coverage area.
According to an embodiment of the present invention, the method further includes obtaining a received signal level measurement value of a serving cell of the coverage enhancement mode MTC user equipment and a received signal quality measurement value of the serving cell.
According to an embodiment of the present invention, the step of calculating the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection further comprises calculating the relative value of the received signal level for cell selection based on a minimum received signal level value required by the serving cell from the base station, an offset and a compensation level value of the minimum received signal level value required, and the received signal level measurement value; and calculating the relative value of the received signal quality for cell selection based on the minimum received signal quality value required for the serving cell from the base station and the offset of the minimum signal quality value required and the received signal quality measurement value.
According to one embodiment of the invention, the coverage enhanced MTC user equipment is in an idle state.
According to a fourth aspect of the present invention, there is provided a method for measurement control in a wireless communication network, comprising the following steps performed by a coverage enhancement mode MTC user equipment in the wireless communication network: obtaining a received signal level measurement value of a serving cell of the coverage enhancement mode MTC user equipment; receiving a quality threshold of the serving cell of the coverage enhanced MTC user equipment from a base station; judging the measurement period of the coverage enhancement mode MTC user equipment according to the quality threshold value from the base station and the received signal level measurement value of the serving cell of the coverage enhancement MTC user equipment: when the received signal level measurement value of the serving cell of the coverage enhancement mode MTC user equipment is larger than the quality threshold value, prolonging a measurement period and performing measurement, otherwise, performing measurement according to the measurement period.
According to an embodiment of the present invention, the quality threshold is a quality threshold of a user equipment in a normal coverage area or a quality threshold of an MTC user equipment in a coverage enhancement mode, and the performing measurement includes performing intra-frequency measurement and inter-frequency measurement or inter-system measurement.
According to an embodiment of the present invention, the measurement period is preset by the wireless communication network and is used for the co-frequency neighbor cell measurement and the inter-frequency measurement or the inter-system measurement of the user equipment with the normal coverage.
According to one embodiment of the invention, the coverage enhancement mode MTC user equipment is in a connected state.
According to a fifth aspect of the present invention, there is provided a method for measurement control in a wireless communication network, comprising the following steps performed by a base station in the wireless communication network: sending a quality threshold to the coverage enhancement mode MTC user equipment, wherein the quality threshold is used for judging the measurement period of the coverage enhancement mode MTC user equipment, and the quality threshold is the quality threshold of the user equipment in a normal coverage range or the quality threshold of the coverage enhancement mode MTC user equipment.
According to the disclosure of the present invention, a method for measurement control of CE-MTC user equipment is proposed, and a unique benefit of the present invention is to perform measurement control of CE-MTC user equipment by designing thresholds for received signal level and received signal quality of CE-MTC user equipment to reduce unnecessary neighbor cell measurements to save power of CE-MTC user equipment. And simultaneously, a more appropriate cell can be efficiently found and selected as a serving cell.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, which proceeds with reference to the accompanying drawings.
Fig. 1 shows a measurement control flow diagram for CE-MTC user equipment in idle state;
fig. 2 shows a schematic diagram of a measurement period of a CE-MTC user equipment in an idle state;
fig. 3 shows a flow chart of extending a measurement period by a CE-MTC user equipment in an idle state;
fig. 4 shows another flow chart of measurement control of CE-MTC user equipment in idle state;
fig. 5 shows a measurement period of a CE-MTC user equipment in an idle state; and
fig. 6 shows a flow chart of measurement control of a CE-MTC user equipment in a connected state (discontinuous reception cycle is not employed).
In the drawings, like or similar reference numbers indicate like or similar devices (modules) or steps throughout the different views.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims. It should be noted that although the steps of methods of the present invention are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results, but rather that the steps described herein can be performed in an order that varies. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step decomposed into multiple step executions.
Generally, a user equipment in a wireless communication network can perform intra-frequency measurement, inter-frequency measurement and inter-system measurement. The measurement of the same frequency refers to the measurement on the downlink carrier frequency of the serving cell, and includes the measurement value of the received signal level, the measurement value of the received signal quality, and the like. The inter-frequency measurement refers to measurement on a downlink carrier frequency different from the serving cell, and includes a measurement value of received signal level, a measurement value of received signal quality, and the like. The inter-system measurement includes inter-system measurement with UTRAN, GERAN, CDMA2000, WCDMA, and the like.
Upon cell selection or reselection, normal coverage based on the broadcasted parameters, as described in the background sectionUser equipment of (1) calculating SrxlevAnd SqualTo decide whether the cell is suitable as a serving cell. Since CE-MTC ues are usually located in areas where coverage enhancement is needed, the signal strength or signal quality received by the CE-MTC ues may be much lower than that received by normal coverage ues, and many companies have proposed introducing a single Q for the CE-MTC uesrxlevmin-ceAnd Qqualmin-ce(or corresponding to Q that has been broadcastrxlevminAnd QqualminOffset of) so doing although CE-MTC user equipment may be based on Qrxlevmin-ceAnd Qqualmin-ceAnd other parameters calculation SrxlevAnd SqualBut there is no enhancement to the measurement control of CE-MTC user equipment.
From the power saving point of view, it is desirable that CE-MTC ues may stop or reduce performing measurements when the serving cell meets certain conditions. However, since SIntraSearchPAnd SIntraSearchQAnd SnonIntraSearchPAnd SnonIntraSearchQAre designed for normal coverage user equipment, they may not be suitable for coverage enhancement situations. Furthermore, since the normal coverage and enhanced coverage scenarios use the same measurement control parameters, when some adjustment to these parameters is needed for one coverage case (e.g., normal coverage), the parameters for the other coverage case change, so the current approach is very inflexible. With SIntraSearchPFor example, in the current protocol, SIntraSearchPHas a value range of 0
62dB, while the maximum coverage of CE-MTC user equipment is specified as 15 dB. Therefore, if SIntraSearchPIs set to be greater than 15dB, the existing measurement control mechanism will not work for CE-MTC ues. Therefore, it is desirable that the base station broadcast an S dedicated to CE-MTC user equipmentIntraSearchP-CEAnd SIntraSearchQ-CEAnd SnonIntraSearchP-CEAnd SnonIntraSearchQ-CETo help the CE-MTC user equipment determine whether corresponding measurements need to be performed. Or the base station broadcasts a signal relative to the existing SIntraSearchPAnd SIntraSearchQAnd SnonIntraSearchPAnd SnonIntraSearchQOffset of value SIntraSearchP-offsetAnd SIntraSearchQ-offsetAnd SnonIntraSearchP-offsetAnd SnonIntraSearchQ-offset。
In a first embodiment, the control parameter S is measured, step 204 shown in FIG. 1IntraSearchP-CE、SIntraSearchQ-CE、SnonIntraSearchP-CEAnd SnonIntraSearchQ-CEThe method is transmitted to the CE-MTC user equipment by the base station in a broadcasting mode through system information. SI (Standard interface)ntraSearchP-CES for specifying CE-MTC user equipment to perform same-frequency neighbor cell measurementrxlevA threshold value of (d); sIntraSearchQ-CESpecifying CE-MTC user equipment to perform co-frequency neighbor cell measurementqualA threshold value of (d); snonintraSearchP-CESpecifying CE-MTC user equipment to perform EUTRAN inter-frequency or inter-system measurementsrxlevA threshold value of (d); snonintraSearchQ-CES specifying that CE-MTC user equipment performs EUTRAN inter-frequency (inter-frequency) or inter-system (inter-RAT) measurementsqualThe threshold value of (2). When calculating S of non-serving cell due to cell reselectionrxlevAnd SqualAt this point (step 202), the CE-MTC ue will limit the required measurement values using the following rules (step 206):
if the serving cell satisfies S at the same timerxlev＞SIntraSearchP-CEAnd Squal＞SIntraSearchQ-CEThe CE-MTC user equipment can choose not to execute the same-frequency adjacent cell measurement, otherwise, the CE-MTC user equipment should execute the same-frequency adjacent cell measurement;
if the serving cell satisfies S at the same timerxlev＞SnonIntraSearchP-CEAnd Squal＞SnonIntraSearchQ-CEThe CE-MTC UE can choose not to perform inter-frequency, or inter-system cell measurement in E-UTRAN of same or lower priority, otherwise, the CE-MTC UE should perform in EUTRAN of same or lower priorityInter-frequency or inter-system cell measurements.
In the second embodiment, the control parameter S is measuredIntraSearchP-offset、SIntraSearchQ-offset、SnonIntraSearchP-offsetAnd SnonIntraSearchQ-offsetThe method is transmitted to the CE-MTC user equipment by the base station in a broadcasting mode through system information. SIntraSearchP-offsetS for specifying CE-MTC user equipment to perform same-frequency neighbor cell measurementrxlevThe offset of the threshold of (a); sIntraSearchQ-offsetSpecifying CE-MTC user equipment to perform co-frequency neighbor cell measurementqualThe offset of the threshold of (c); snonintraSearchP-offsetSpecifying CE-MTC user equipment to perform EUTRAN inter-frequency or inter-system measurementsrxlevThe offset of the threshold of (a); snonintraSearchQ-offsetSpecifying CE-MTC user equipment to perform inter-EUTRAN inter-frequency or inter-system measurementsqualIs offset from the threshold value of (a). When calculating S of non-serving cell due to cell reselectionrxlevAnd SqualThen, the CE-MTC user equipment will limit the required measurement values using the following rules:
if the serving cell satisfies S at the same timerxlev＞(SIntraSearchP+SIntraSearchP-offset) And Squal＞(SIntraSearchQ+SIntraSearchQ-offset) The CE-MTC user equipment can choose not to execute the same-frequency adjacent cell measurement, otherwise, the CE-MTC user equipment should execute the same-frequency adjacent cell measurement;
if the serving cell satisfies S at the same timerxlev＞(SnonIntraSearchP+SnonIntraSearchP-offset) And Squal＞(SnonIntraSearchQ+SnonIntraSearchQ-offset) The CE-MTC user equipment can choose not to perform inter-frequency or inter-system measurement in the same or lower priority E-UTRAN, otherwise, the CE-MTC user equipment should perform inter-frequency or inter-system measurement in the same or lower priority E-UTRAN.
If the serving cell satisfies Srxlev＞SIntraSearchPAnd Squal＞SIntraSearchQOr Srxlev＞SnonIntraSearchPAnd Squal＞SnonIntraSearchQThe ue in the normal coverage area will stop the measurement between the same frequency or different frequency and different systems. This is because in the normal case, when the signal strength or quality of the serving cell is good enough, it is difficult for a user with normal coverage to find a better cell again through measurement. However, the situation is different for CE-MTC user equipment. Since coverage enhancement is required, although the serving cell can satisfy a certain condition, the signal strength or quality of the serving cell is not really good. Therefore, from the perspective of better cell selection, it may not be desirable that CE-MTC ues completely stop performing intra-frequency, inter-frequency or inter-system measurements when the serving cell meets certain conditions.
As another approach, a CE-MTC user equipment in an idle state may employ a longer measurement period (e.g., T) than the existing one, particularly when a serving cell satisfies a certain conditionmeasure，EUTRAN_Intra，Tmeasure，EUTRAN_InterEtc.) longer measurement period, so that the CE-MTC user equipment makes measurements less frequent for co-frequency neighbor cells, inter-frequency or inter-system measurements. Considering the "delay tolerant" feature of various services of the CE-MTC user equipment, the CE-MTC user equipment may find a suitable cell through relatively few measurements and then complete the transmission of data. Another potential benefit of extending the measurement period rather than stopping the measurement is that certain neighboring cells (e.g., small cells) may be dynamically turned on/off and may be turned on at different times of the day, and with infrequent measurements it may be possible to discover these neighboring cells and make corresponding traffic transmissions.
Fig. 2 illustrates measurement behavior of a CE-MTC user equipment when extending an existing measurement period. When the CE-MTC user equipment works in the coverage enhancement mode, compared with the existing measurement period, if the CE-MTC user equipment serves the S of the cellrxlevAnd SqualWhen certain conditions are met, the CE-MTC user equipment can adopt a longer measurement period. As shown in fig. 2, for example, when SrxlevIs greater than SIntraSearchP-CE(or greater than S)IntraSearchP+SIntraSearchP-offset) And SqualIs greater than SIntraSearchQ-CE(or greater than S)IntraSearchQ+SIntraSearchQ-offset) The measurement period is changed from the original T1 to T2, and the value of T2 is greater than the value of T1.
Taking measurements of co-frequency neighbor cells as an example, in the current 3GPP specification, in idle case, if Srxlev≤SIntraSearchPOr Squal≤SIntraSearchQThen the normal coverage user equipment will be at least every T for the identified co-frequency neighbor cellsmeasure，EUTRAN_IntraA received signal level measurement and a received signal quality measurement are measured.
In coverage enhancement mode, as shown in fig. 3, in step 302, the CE-MTC user equipment first calculates S of the non-serving cell according to parameters from the base stationrxlevAnd Squal. In step 304, the CE-MTC user equipment receives a measurement control parameter S configured for the CE-MTC user equipment from a base stationIntraSearchP-CE、SIntraSearchQ-CE、SnonIntraSearchP-CEAnd SnonIntraSearchQ-CE. In step 304, the CE-MTC ue determines whether the serving cell meets a certain condition: when the serving cell satisfies Srxlev＞SIntraSearchP-CEAnd Squal＞SIntraSearchQ-CEOccasionally, for CE-MTC ues in idle condition, the existing measurement period should be extended to Tmeasure，EUTRAN_Intra_CETo perform co-frequency neighbor cell measurements to search for more suitable co-frequency neighbor cells; otherwise, should press Tmeasure，EUTRAN_IntraThe same-frequency neighbor cell measurement is performed for the measurement period. Similarly, the inter-frequency measurement period T of CE-MTC user equipmentmeasure，EUTRAN_InterThe measurement period between different systems can be correspondingly prolonged. As another implementation, the base station may also send a measurement control parameter S, as shown in step 404 in FIG. 4IntraSearchP-offset、SIntraSearchQ-offset、SnonIntraSearchP-offsetAnd SnonIntraSearchQ-offsetWhich specifies SrxlevOr SqualThe offset of the corresponding threshold value, accordingly, toFor the measurement control of the co-frequency neighbor cells as an example, the CE-MTC ue will adjust the required measurement values using the following rules (step 406): when CE-MTC user equipment simultaneously satisfies Srxlev＞(SnonIntraSearchP+SnonIntraSearchP-offset) And Squal＞(SnonIntraSearchQ+SnonIntraSearchQ-offset) Occasionally, for CE-MTC ues in idle condition, the existing measurement period should be extended to Tmeasure，EUTRAN_Intra_CETo perform co-frequency neighbor cell measurements to search for more suitable co-frequency neighbor cells; otherwise, should press Tmeasure，EUTRAN_IntraThe same-frequency neighbor cell measurement is performed for the measurement period.
As shown in fig. 5, when the CE-MTC user equipment in the idle state satisfies the condition as shown in fig. 2, the corresponding measurement period of the CE-MTC user equipment in the idle state is extended to, for example, the existing Tmeasure，EUTRAN_Intra5 times the value. It should be understood by those skilled in the art that when Discontinuous Reception (DRX) period in the existing standard is changed, the corresponding measurement periods for the CE-MTC ue in idle state, such as T, are the same frequency, different frequency and inter-system measurement periods, for examplemeasure，EUTRAN_Intra_CE，Tmeasure，EUTRAN_Inter-CE，TdetectUTRA_FDD-CEAnd may vary accordingly.
In connected mode, the CE-MTC user equipment also needs to enhance measurement control. In one embodiment, the CE-MTC user equipment takes existing s-measurements but redefines the measurement behavior of the CE-MTC user equipment. When the received signal level measurement value of the primary serving cell exceeds the S-measurement value, the CE-MTC user equipment extends the measurement period to perform the measurement of the neighbor cell, instead of stopping performing the measurement of the neighbor cell as in the prior art.
In another embodiment, the CE-MTC user equipment introduces a new parameter S for the CE-MTC user equipmentCE-a measured value. The base station transmits a message for a CE-MTC ue to a user through any suitable format and resource in a physical layer, mac (medium Access control) layer or RRC (Radio resource control) messageS ofCE-a measurement value, the base station deciding S according to the signal strength of the CE-MTC user equipment and how often the CE-MTC user equipment needs to be measuredCE-a measured value. When the received signal level measurement of the primary serving cell exceeds SCEWhen measuring values, the CE-MTC user equipment adopts a longer measurement period than the existing measurement period.
As shown in FIG. 6, the CE-MTC user equipment receives S-measurement value or S from the base stationCE-a measurement value (step 602). When the measured value of the received signal level of the main service cell is larger than the S-measured value or SCE-extending the existing measurement period T of co-frequency neighbor cells when measuring valuesmeasurement_period，IntraAnd Tmeasure_intraTo Tmeasurement_period，Intra_CEAnd Tmeasure_intra_CEOtherwise, according to the existing measuring period Tmeasurement_period，IntraAnd Tmeasure_intraA measurement is performed (step 604).
It should be noted that according to the current specification, for example, 3GPP36.113, in connected mode, if the ue in normal coverage does not employ a discontinuous reception period, the measurement period of the existing frequency measurement of the co-frequency neighbor cell is 200 ms. For CE-MTC ues in enhanced coverage mode, if they do not use discontinuous reception period, the corresponding intra-frequency neighbor cell measurement period should be extended to, for example, 1000 ms. The measurement period between other corresponding inter-frequency and inter-system should also be extended. For example, 5 times of the existing inter-frequency or inter-system measurement period is adopted as the inter-frequency or inter-system measurement period of the CE-MTC user equipment in the connected state.
If the user equipment in the normal coverage area adopts the discontinuous receiving period, the measurement period of the existing frequency measurement of the same-frequency adjacent cell is 200ms or 5 times of the discontinuous receiving period. For CE-MTC ues in the enhanced coverage mode, in the case that a discontinuous reception period is adopted, the corresponding measurement period of the same-frequency neighboring cell should also be extended to be 5 times that of the ue in the normal coverage range. The measurement period between other corresponding inter-frequency and inter-system should also be extended.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Furthermore, it will be obvious that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Several elements recited in the apparatus claims may also be implemented by one element. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (17)
1. A method for measurement control in a wireless communication network, comprising the following steps performed by a coverage enhancement mode, MTC, user equipment in the wireless communication network:
calculating a relative value of a received signal level for cell selection and a relative value of a received signal quality for cell selection;
receiving a first threshold, a second threshold, a third threshold and a fourth threshold from a base station, wherein the first threshold represents a threshold of a relative value of a received signal level for cell selection, which is measured by the MTC user equipment in the coverage enhancement mode in the same-frequency neighbor cell; the second threshold represents a threshold of a relative value of the received signal quality for cell selection for the same-frequency neighbor cell measurement performed by the coverage enhancement mode MTC user equipment; the third threshold represents a threshold of a relative value of the received signal level for cell selection for the inter-frequency measurement or inter-system measurement performed by the coverage enhancement mode MTC user equipment; the fourth threshold represents a threshold of a relative value of the received signal quality for cell selection for the inter-frequency measurement or the inter-system measurement performed by the coverage enhancement mode MTC user equipment; and
determining a measurement period according to the first threshold, the second threshold, the third threshold, and the fourth threshold from the base station, and the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection:
extending a first measurement period and performing the same-frequency neighbor cell measurement when the relative value of the received signal level for cell selection is greater than the first threshold and the relative value of the received signal quality for cell selection is greater than the second threshold;
extending a second measurement period and performing the inter-frequency measurement or the inter-system measurement of the same or lower priority when the relative value of the received signal level for cell selection is greater than the third threshold and the relative value of the received signal quality for cell selection is greater than the fourth threshold.
2. The method of claim 1, further comprising
Performing the co-frequency neighbor cell measurement according to the first measurement period when the relative value of the received signal level for cell selection is less than or equal to the first threshold or the relative value of the received signal quality for cell selection is less than or equal to the second threshold;
performing the same or lower priority inter-frequency measurement or inter-system measurement according to the second measurement period when the relative value of the received signal level for cell selection is less than or equal to the third threshold or the relative value of the received signal quality for cell selection is less than or equal to the fourth threshold.
3. The method of claim 1, wherein the first measurement period is preset by the wireless communication network and used for intra-frequency neighbor cell measurement of a normal coverage user equipment, and the second measurement period is preset by the wireless communication network and used for inter-frequency or inter-system measurement of the normal coverage user equipment.
4. The method of claim 1, further comprising obtaining a received signal level measurement of a serving cell of the coverage enhancement mode MTC user equipment and a received signal quality measurement of the serving cell.
5. The method of claim 1, wherein the step of calculating the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection further comprises
Calculating a relative value of the received signal level for cell selection based on a minimum received signal level value required for a serving cell from the base station, an offset and compensation level value of the minimum received signal level value required, and the received signal level measurement value; and
calculating the relative value of received signal quality for cell selection based on the minimum required received signal quality value for the serving cell from the base station and the offset of the minimum required signal quality value and the received signal quality measurement value.
6. The method of claim 1, wherein the coverage enhanced MTC user equipment is in an idle state.
7. A method for measurement control in a wireless communication network, comprising the following steps performed by a base station in the wireless communication network:
sending a first threshold, a second threshold, a third threshold and a fourth threshold to the MTC user equipment in the coverage enhancement mode, wherein the first threshold represents a threshold of a relative value of a received signal level for cell selection, which is measured by the MTC user equipment in the coverage enhancement mode in a same-frequency neighbor cell; the second threshold represents a threshold of a relative value of received signal quality for cell selection for the MTC user equipment in the coverage enhancement mode to perform the co-frequency neighbor cell measurement; the third threshold represents a threshold of a relative value of the received signal level for cell selection for the inter-frequency measurement or inter-system measurement performed by the coverage enhancement mode MTC user equipment; the fourth threshold represents a threshold of a relative value of the received signal quality for cell selection for the inter-frequency measurement or the inter-system measurement performed by the coverage enhancement mode MTC user equipment; and
sending a minimum received signal level value required by a serving cell of the coverage enhancement mode MTC user equipment, an offset of the minimum received signal level value required by the serving cell and a compensation level value of the serving cell to the coverage enhancement mode MTC user equipment;
and sending the minimum received signal quality value required by the serving cell and the offset of the minimum received signal quality value required by the serving cell to the MTC user equipment in the coverage enhancement mode.
8. A method for measurement control in a wireless communication network, comprising the following steps performed by a coverage enhancement mode, MTC, user equipment in the wireless communication network:
calculating a relative value of a received signal level for cell selection and a relative value of a received signal quality for cell selection;
receiving a first threshold, a second threshold, a third threshold and a fourth threshold from a base station, wherein the first threshold represents a threshold of a relative value of a received signal level for cell selection, which is measured by the MTC user equipment in the coverage enhancement mode in the same-frequency neighbor cell; the second threshold represents a threshold of a relative value of the received signal quality for cell selection for the same-frequency neighbor cell measurement performed by the coverage enhancement mode MTC user equipment; the third threshold represents a threshold of a relative value of the received signal level for cell selection for the inter-frequency measurement or inter-system measurement performed by the coverage enhancement mode MTC user equipment; the fourth threshold represents a threshold of a relative value of the received signal quality for cell selection for the inter-frequency measurement or the inter-system measurement performed by the coverage enhancement mode MTC user equipment;
determining whether to perform a measurement according to the first threshold, the second threshold, the third threshold, and the fourth threshold from the base station, and the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection: and
when the relative value of the received signal level for cell selection is greater than the first threshold and the relative value of the received signal quality for cell selection is greater than the second threshold, not performing intra-frequency cell-to-cell measurement, otherwise performing intra-frequency cell-to-cell measurement according to a first measurement period;
when the relative value of the received signal level for cell selection is greater than the third threshold and the relative value of the received signal quality for cell selection is greater than the fourth threshold, the same or lower priority inter-frequency measurement or inter-system measurement is not performed, and otherwise the same or lower priority inter-frequency measurement or inter-system measurement is performed according to a second measurement period.
9. The method of claim 8, wherein the first measurement period is preset by the wireless communication network and used for intra-frequency neighbor cell measurement of a normal coverage user equipment, and the second measurement period is preset by the wireless communication network and used for inter-frequency measurement or inter-system measurement of a normal coverage user equipment.
10. The method of claim 8, further comprising obtaining a received signal level measurement of a serving cell and a received signal quality measurement of a serving cell of the coverage enhancement mode MTC user equipment.
11. The method of claim 8, wherein the step of calculating the relative value of the received signal level for cell selection and the relative value of the received signal quality for cell selection further comprises
Calculating a relative value of the received signal level for cell selection based on a minimum received signal level value required for a serving cell from the base station, an offset and compensation level value of the minimum received signal level value required, and the received signal level measurement value; and
calculating the relative value of received signal quality for cell selection based on the minimum required received signal quality value for the serving cell from the base station and the offset of the minimum required signal quality value and the received signal quality measurement value.
12. The method of claim 8, wherein the coverage enhanced MTC user equipment is in an idle state.
13. A method for measurement control in a wireless communication network, comprising the following steps performed by a coverage enhancement mode, MTC, user equipment in the wireless communication network:
obtaining a received signal level measurement value of a serving cell of the coverage enhancement mode MTC user equipment;
receiving a quality threshold of the serving cell of the coverage enhanced MTC user equipment from a base station; and
judging the measurement period of the coverage enhancement mode MTC user equipment according to the quality threshold value from the base station and the received signal level measurement value of the serving cell of the coverage enhancement MTC user equipment: when the received signal level measurement value of the serving cell of the coverage enhancement mode MTC user equipment is larger than the quality threshold value, prolonging a measurement period and performing measurement, otherwise, performing measurement according to the measurement period.
14. The method according to claim 13, wherein the quality threshold is a quality threshold of a user equipment with a normal coverage or a quality threshold of an MTC user equipment with the coverage enhancement mode, and the performing measurement includes performing intra-frequency measurement and inter-frequency measurement or inter-system measurement.
15. The method of claim 13, wherein the measurement period is preset by the wireless communication network and is used for intra-frequency neighbor cell measurement and inter-frequency measurement or inter-system measurement of a user equipment with a normal coverage area.
16. The method of claim 13, wherein the coverage enhancement mode MTC user equipment is in a connected state.
17. A method for measurement control in a wireless communication network, comprising the following steps performed by a base station in the wireless communication network:
sending a quality threshold to the coverage enhancement mode MTC user equipment, wherein the quality threshold is used for judging the measurement period of the coverage enhancement mode MTC user equipment, and the quality threshold is the quality threshold of the user equipment in a normal coverage range or the quality threshold of the coverage enhancement mode MTC user equipment.
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| WO2017107100A1 (en) * | 2015-12-23 | 2017-06-29 | 华为技术有限公司 | Information transmission method, device and system |
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