CN110636560A - Cell reselection method and device and user equipment - Google Patents

Cell reselection method and device and user equipment Download PDF

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CN110636560A
CN110636560A CN201810644663.5A CN201810644663A CN110636560A CN 110636560 A CN110636560 A CN 110636560A CN 201810644663 A CN201810644663 A CN 201810644663A CN 110636560 A CN110636560 A CN 110636560A
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cell
frequency
same
signal quality
cells
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CN110636560B (en
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邓云
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/165—Performing reselection for specific purposes for reducing network power consumption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a cell reselection method, a cell reselection device and user equipment. The method comprises the following steps: determining at least two strong cells from a same-frequency cell and a pilot frequency cell with the same priority as the current resident frequency; for the at least two strong cells, determining the number of beams which exceed a signal quality threshold value and are contained in each strong cell, wherein the same-frequency cell or the same-frequency cell and a different-frequency cell with the same priority as the current resident frequency adopt the same signal quality threshold value; and selecting the cell containing the largest number of beams exceeding the signal quality threshold value for camping. The invention can avoid ping-pong reselection, thereby reducing the power consumption of the UE and ensuring that the UE is smoothly accessed into a network.

Description

Cell reselection method and device and user equipment
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a cell reselection method, apparatus and user equipment.
Background
In a mobile communication system, handover and cell reselection are very important components, and specifically, when a UE (User Equipment) leaves one cell and enters another cell, signals of the original cell (serving cell) received by the UE become weaker and weaker, and signals of the entering cell received by the UE become stronger and stronger. In order to maintain the quality of the signals received by the UE, the UE must be switched from the original base station (or cell) to the base station (or cell) where the newly entered signal is stronger. For a connected UE, this transition between base stations is called handover; for idle UE, the change of the UE resident cell is completed through a cell Reselection (Reselection) process, and it is necessary to detect the serving cell and the target cell and perform cell Reselection in a cell meeting the requirement.
In a wireless cellular system, there is a cell reselection strategy based on frequency priority for a UE during inter-cell reselection. When planning a cell network, an operator divides all frequencies into several groups, and each group is assigned with a priority. Each cell broadcasts the priority of the frequency on which it is located and the priority of the frequency on which the adjacent cell is located. If a cell on a high priority frequency meets the reselection condition, the UE needs to reselect to the cell on the high priority frequency.
For cells on the same frequency or cells on the same priority frequency, the UE needs to perform cell reselection according to the following ranking criteria of signal quality:
calculating R for a serving cells＝Qmeas,s+ Qhyst, R is calculated for the neighbor celln＝Qmeas,nQoffset, where s denotes the serving cell, n denotes the neighbor cell, Qmeas,sDenotes RSRP (Reference Signal Received Power), Q, of a serving cell measured by a UE during cell reselectionmeas,nIndicating that UE measures RSRP of adjacent cells in the cell reselection process, Qhyst indicating service cell hysteresis, Qoffset indicating offset value of adjacent cells, and Qoffset indicating same-frequency adjacent cell Qoffset as Qoffsets,nQoffset of the pilot frequency adjacent areas,n+Qoffsetfrequency，Qoffsets,nOffset, Qoffset, representing the cell levelfrequencyIndicating the shift in frequency level. The UE sorts all R values of the cells on the same frequency priority, the first cell is the best cell, and the UE reselects the best cell. Broadcasting Qhyst, Qoffset and Qoffset in system messages of serving cellfrequencyAnd after the UE reads the system message, the parameters are obtained for cell reselection. The ranking criteria are performed on the premise that these cells need to meet the criteria for cell Selection (Selection), i.e. the following S-criteria:
the criteria for satisfying cell selection in the existing protocol is defined as having to satisfy both Srxlev >0 and Squal >0, where
Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)–Pcompensation，
Squal＝Qqualmeas–(Qqualmin+Qqualminoffset)，
In LTE (Long term evolution) system, Q in the above formularxlevmeasMeasuring RSRP, Q of a cell for a UEqualmeasMeasuring the RSRQ (Reference Signal Received Quality) of the cell for the UE; qrxlevminAnd QqualminThe two parameters are respectively corresponding minimum values, and the two parameters are broadcasted in a system message of a serving cell; qrxlevminoffsetAnd QqualminoffsetRespectively corresponding offset, and only applied to a UE residing in a VPLMN (Visited Public Land Mobile Network) to evaluate a cell in a PLMN (Public Land Mobile Network) of high priority; pcomp pisation is a method that considers the actual Maximum transmit power (Maximum RF output power, P) of the UEPowerClassExpressed) and Maximum allowed transmit power (Maximum TX power level, P) for the cellEMAX_HExpressed) of Pcompensition ═ max (P)EMAX_H–PPowerClass，0)。
In 5G (or NR, New Radio), because 5G is deployed at high frequency, wireless signals exhibit characteristics of good directivity and large path loss at high frequency, a large cell needs multiple beams (Beam) to achieve complete coverage, and one Beam can only cover a limited range. A small cell may contain only one beam. For a cell formed by multiple beams, due to the limitation of hardware, not all beams can be transmitted at the same time, and time-sharing transmission is required, which is called Beam Sweeping (Beam Sweeping).
For a cell in NR, its synchronization signal (including primary and secondary synchronization signals) is transmitted within 5ms at a certain period, such as a period of 20ms/40ms/80 ms. A cell may transmit one or more SS blocks (synchronization signal blocks, i.e. different beams), such as 4 SS blocks or 8 SS blocks. One SS block includes PSS (Primary synchronization Signal)/SSS
(Secondary Synchronization Signal) and PBCH (Physical Broadcast Channel). The PSS and SSS are used to identify the cell identity to the UE and to obtain symbol-level synchronization for the UE. When the UE evaluates the signal quality of a cell, it needs to combine the measured strongest N beams of the cell to obtain the signal quality of the cell. The value of N may be configured by the network, N > -1.
When Cell reselection is performed in the NR, two cells Cell 1 and Cell 2 with the same frequency are considered, and have partial overlapping coverage, an almost stationary UE is in an overlapping coverage area, and the UE measures that 3 beam signals of Cell 1 are X1, X2 and X3 in sequence; the 3 beam signals of Cell 2 measured by the UE are Y1, Y2 and Y3 in this order. It is assumed that the signal quality value of a cell consists of the strongest 3 beams of the cell, which of course need to meet a preset threshold. Assume that Cell 1 has a signal quality exceeding Cell 2 and that the UE currently resides in Cell 1. The system message of Cell 1 broadcasts a preset signal quality threshold value, at this time, the UE needs to select a Cell with the maximum number of good beams (beams exceeding the signal quality threshold value, according to ts38.304vf.0.0, the threshold is tentatively named absThreshSS-association) to camp on, and according to the threshold of the decision good beams broadcast by Cell 1, the UE finds that the number of good beams of Cell 1 is 1, and the number of good beams of Cell 2 is 2. At this time, the UE needs to reselect to Cell 2, and after the UE resides in Cell 2, the following two ping-pong reselection scenarios may occur:
scene 1: the UE needs to determine the measured good beam numbers of Cell 1 and Cell 2 according to the threshold of the decision good beam broadcast by Cell 2, because the threshold of Cell 2 is lower than that set by Cell 1, the UE finds that Cell 1 has 3 good beams, and Cell 2 has only 2 good beams. At this time, the UE needs to reselect to Cell 1.
Scene 2: the UE finds that Cell 2 is not configured with a threshold for determining the good beam number, i.e. the UE needs to sort according to R (i.e. according to R)sAnd RnRank) selects the strongest Cell dwell because Cell 1 has a better signal than Cell 2 and therefore the UE needs to reselect to Cell1。
When the UE frequently performs cell reselection between the two cells, not only the power of the UE is consumed, but also the frequent change of the camped cell makes the UE may not smoothly access the network.
Disclosure of Invention
The cell reselection method, the cell reselection device and the user equipment provided by the invention can avoid ping-pong reselection, thereby reducing the power consumption of the UE and ensuring that the UE is smoothly accessed into a network.
In a first aspect, the present invention provides a cell reselection method, including:
determining at least two strong cells from a same-frequency cell and a pilot frequency cell with the same priority as the current resident frequency;
for the at least two strong cells, determining the number of beams which exceed a signal quality threshold value and are contained in each strong cell, wherein the same-frequency cell or the same-frequency cell and a different-frequency cell with the same priority as the current resident frequency adopt the same signal quality threshold value;
and selecting the cell containing the largest number of beams exceeding the signal quality threshold value for camping.
Optionally, the determining at least two strong cells from the intra-frequency cell and the inter-frequency cell with the same priority as the current camping frequency includes: and determining the strongest cell according to the RSRP of the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency, and determining the cell with the signal quality difference within a preset range with the strongest cell as the strong cell.
Optionally, the method further comprises:
and when at least two cells exist in the cell containing the largest number of beams exceeding the signal quality threshold value, selecting the cell with the largest RSRP in the at least two cells for camping.
Optionally, the interface signaling between the base stations carries a frequency and a signal quality threshold, or a frequency and a frequency priority and a signal quality threshold, so that all neighboring base stations use the same signal quality threshold when configuring neighboring cells with the same frequency or neighboring cells with the same frequency priority.
In a second aspect, the present invention provides another cell reselection method, including:
when the UE finds a same-frequency adjacent cell or a different cell reselection mechanism is used by a different cell reselection mechanism with the same priority as the current resident frequency in the cell reselection process, determining a strongest cell from the same-frequency cell and the different-frequency cell with the same priority as the current resident frequency;
and selecting the strongest cell for residing.
Optionally, the determining a strongest cell from the intra-frequency cell and the inter-frequency cell with the same priority as the current camping frequency includes: and determining the strongest cell according to the RSRP of the co-frequency cell and the pilot frequency cell with the priority same as the current resident frequency.
Optionally, the different cell reselection mechanisms include a reselection mechanism that selects the strongest cell to camp on according to an RSRP ranking and a reselection mechanism that selects the cell to camp on according to a number of beams that exceeds a signal quality threshold.
In a third aspect, the present invention provides a cell reselection method, including:
recording a cell reselected by UE in a preset time;
and when the number of times that the UE reselects between the at least two cells within the preset time exceeds the preset number of times, selecting the cell with the maximum RSRP in the at least two cells for camping.
Optionally, the method further comprises:
and after the preset time, or the UE finds that the signal quality of the resident cell changes, or the UE finds that the signal quality of the at least two cells changes, the UE resumes executing cell reselection according to the parameters in the system message broadcast by the resident cell.
In a fourth aspect, the present invention provides a cell reselection apparatus, including:
the first determining unit is used for determining at least two strong cells from the same-frequency cell and the different-frequency cell with the same priority as the current resident frequency;
a second determining unit, configured to determine, for the at least two strong cells, a number of beams included in each strong cell and exceeding a signal quality threshold, where the same-frequency cell, or the same-frequency cell and a different-frequency cell with the same priority as a current camping frequency use the same signal quality threshold;
a first selecting unit, configured to select a cell including the largest number of beams exceeding a signal quality threshold for camping.
Optionally, the first determining unit is configured to determine a strongest cell according to RSRP of the co-frequency cell and the pilot frequency cell with the same priority as the current camping frequency, and then determine that a cell with a signal quality difference within a predetermined range from the strongest cell is a strong cell.
Optionally, the apparatus further comprises:
a second selecting unit, configured to select, when there are at least two cells including a cell with the largest number of beams that exceeds a signal quality threshold, a cell with the largest RSRP among the at least two cells to camp on.
Optionally, the interface signaling between the base stations carries a frequency and a signal quality threshold, or a frequency and a frequency priority and a signal quality threshold, so that all neighboring base stations use the same signal quality threshold when configuring neighboring cells with the same frequency or neighboring cells with the same frequency priority.
In a fifth aspect, the present invention provides another cell reselection apparatus, including:
a third determining unit, configured to determine, when the UE finds an intra-frequency neighboring cell in a cell reselection process, or when a different cell reselection mechanism is used by a different cell from a different frequency cell having the same priority as a current resident frequency, a strongest cell from the intra-frequency neighboring cell and the different frequency cell having the same priority as the current resident frequency;
and a third selecting unit, configured to select the strongest cell for camping.
Optionally, the third determining unit is configured to determine the strongest cell according to RSRP of the co-frequency cell and the inter-frequency cell with the same priority as the current camping frequency.
Optionally, the different cell reselection mechanisms include a reselection mechanism that selects the strongest cell to camp on according to an RSRP ranking and a reselection mechanism that selects the cell to camp on according to a number of beams that exceeds a signal quality threshold.
In a sixth aspect, the present invention provides a cell reselection apparatus, comprising:
the recording unit is used for recording a cell reselected by the UE within a preset time;
and a fourth selecting unit, configured to select a cell with a largest RSRP among the at least two cells for camping when it is found that the number of times that the UE reselects between the at least two cells within the predetermined time exceeds a predetermined number of times.
Optionally, the apparatus further comprises:
and a fifth selecting unit, configured to, after a predetermined time elapses, or the UE finds that the signal quality of the camped cell changes, or the UE finds that the signal qualities of the at least two cells change, resume performing cell reselection according to the parameters in the system message broadcast by the camped cell.
In a seventh aspect, the present invention provides a user equipment, where the user equipment includes the first cell reselection apparatus.
In an eighth aspect, the present invention provides a user equipment, where the user equipment includes the second cell reselection apparatus.
In a ninth aspect, the present invention provides a user equipment, where the user equipment includes the third cell reselection device.
The cell reselection method, the device and the user equipment provided by the embodiment of the invention set the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency to adopt the cell reselection mechanism for selecting the resident cell according to the good beam number, and set the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency to adopt the same signal quality threshold value, thereby ensuring that the UE obtains a constant number when each cell determines the good beam number and avoiding the occurrence of ping-pong reselection; or the common-frequency cell and the pilot frequency cell with the same priority as the current resident frequency are set to be cell reselection mechanisms which adopt the strongest cell to reside, and the strongest cell is constant, so that ping-pong reselection can be avoided; or when the UE frequently reselects between the two cells, the cell with the maximum RSRP in the two cells is selected to reside, so that ping-pong reselection can be eliminated, the power consumption of the UE is reduced, and the UE is ensured to be smoothly accessed into the network.
Drawings
Fig. 1 is a flowchart illustrating a cell reselection method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a cell reselection method according to another embodiment of the present invention;
fig. 3 is a flowchart of a cell reselection method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a cell reselection apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cell reselection apparatus according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a cell reselection apparatus according to yet another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a cell reselection method, as shown in fig. 1, the method includes:
s11, the UE determines at least two strong cells from the same-frequency cell and the different-frequency cell with the same priority as the current resident frequency.
Specifically, the UE may determine at least two strong cells according to RSRP of the co-frequency cell and the inter-frequency cell with the same priority as the current camping frequency, that is, according to R ranking (according to R)sAnd RnRank) at least two cells for which the signal is strong. The serving cell where the UE currently resides can be configured with one parameterThe number ranging tobestcell allows the UE to determine one or several strong cells within a certain range of signal quality difference from the strongest cell. For example, if the rangeToBestCell is set to-3 db and the UE measures a signal quality of-62 dbm for the strongest cell, the UE considers all cells exceeding-65 dbm (i.e., -62-3) to be strong cells, and the set of strong cells includes the strongest cell.
In this step, the co-frequency cell may refer to a neighboring cell having the same frequency as the currently camped cell of the UE, or to a neighboring cell on the same frequency.
S12, for the at least two strong cells, the UE determines the number of beams included in each cell that exceed a signal quality threshold (absThreshSS-association), where the same frequency cell, or the same frequency cell and an alien frequency cell with the same priority as the current camping frequency use the same signal quality threshold, the UE obtains the signal quality threshold from the currently camping serving cell, and the serving cell may set the same signal quality threshold for the same frequency cell, or the same frequency cell and an alien frequency cell with the same priority as the current camping frequency.
Specifically, the network presets the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency, and both adopt a cell reselection mechanism for selecting the resident cell according to the good beam number, and sets the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency to adopt the same signal quality threshold, that is: the threshold value used to determine good beam (beam exceeding the signal quality threshold absThreshSS-association) is the same. Or the network setting uses the same signal quality threshold for cells on the same frequency. For a cell, the UE may measure multiple beams, i.e., different SS blocks, for the cell, but the good beams that exceed the signal quality threshold are a subset of the beam number of the cell measured by the UE.
In order to ensure that the cells with the same frequency or the cells with the same frequency priority adopt the same signal quality threshold, the interface signaling between the base stations may carry the frequency and the signal quality threshold, or the frequency and the frequency priority and the signal quality threshold, so that all the neighboring base stations can adopt the same signal quality threshold when configuring the neighboring cells with the same frequency or the neighboring cells with the same frequency priority. The interface signaling between the existing base stations comprises Xn interface establishment and base station configuration updating, and cells can be added in the signaling to indicate the signal quality threshold value set by the cell under the control of the base station, so that after the adjacent base stations obtain the information, the same signal quality threshold value can be set in the cell with the same frequency or the same signal quality threshold value can be set for the cells with the same frequency priority.
S13, the UE selects the cell containing the largest number of beams exceeding the signal quality threshold for camping.
Further, if there are at least two cells including the cell with the largest number of beams exceeding the signal quality threshold, the UE selects the cell with the largest RSRP among the at least two cells to camp on.
In the cell reselection method provided in the embodiment of the present invention, the UE determines at least two strong cells from the co-frequency cells and the inter-frequency cells having the same priority as the current camping frequency, determines the number of beams included in the at least two strong cells and exceeding a signal quality threshold, selects a cell having the largest number of beams exceeding the signal quality threshold for camping, and when there are at least two cells in the cell having the largest number of beams exceeding the signal quality threshold, the UE selects a cell having the largest RSRP among the at least two cells for camping. Because the same-frequency cells and the pilot frequency cells with the same priority as the current resident frequency adopt the same signal quality threshold value, the UE can be ensured to obtain a constant number when determining the good beam number for each cell, the ping-pong reselection is avoided, and the power consumption of the UE is reduced and the UE is ensured to be smoothly accessed into the network.
An embodiment of the present invention provides another cell reselection method, as shown in fig. 2, the method includes:
s21, when the UE finds out the adjacent cells with the same frequency in the process of cell reselection, or when the different cell reselection mechanisms are used by the different frequency cells with the same priority as the current resident frequency, the UE determines the strongest cell from the adjacent cells with the same frequency and the different frequency cells with the same priority as the current resident frequency.
Specifically, the UE may determine the strongest cell according to the RSRP of the co-frequency cell and the pilot frequency cell with the same priority as the current camping frequency.
And S22, the UE selects the strongest cell for residing.
Specifically, when the network sets reselection mechanisms for the same-frequency cells and the different-frequency cells with the same priority as the current resident frequency, different reselection mechanisms are adopted by the network, so that some UEs find that a reselection mechanism for selecting the strongest cell to reside according to RSRP ranking and a reselection mechanism for selecting the cell to reside according to a good beam number exceeding a signal quality threshold value are partially adopted among the same-frequency neighboring cells or among the different-frequency cells with the same priority as the current resident frequency in a reselection process, and in order to avoid the possible ping-pong reselection, the UE adopts a cell reselection mechanism for selecting the strongest cell to reside. By adopting the scheme, the UE needs to record the cell reselection mechanism used in the most recent cell reselection process for several times so as to judge whether the reselection mechanism is consistent between the cells with the same frequency or between the cells with different frequencies with the same priority as the current resident frequency.
The different cell reselection mechanisms comprise a reselection mechanism for selecting the strongest cell to camp on according to the RSRP sorting and a reselection mechanism for selecting the cell to camp on according to the good beam number exceeding the signal quality threshold value.
The cell reselection method provided by the embodiment of the invention determines the strongest cell from the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency, and selects the strongest cell for residing. Because the strongest cell is constant, ping-pong reselection can be avoided, thereby reducing the power consumption of the UE and ensuring that the UE accesses the network smoothly.
An embodiment of the present invention provides another cell reselection method, as shown in fig. 3, the method includes:
and S31, the UE records the cell reselected by the UE within the preset time.
Wherein the predetermined time may be set by a serving cell where the UE is camped on, or by the UE itself, such as the value set to 8 seconds.
And S32, when the number of times of reselecting the UE between the at least two cells in the preset time exceeds the preset number, the UE selects the cell with the maximum RSRP in the at least two cells for residing.
And in the preset time, the number of times that the UE reselects between at least two cells exceeds a preset number of times, that is, ping-pong reselection occurs, where the occurrence scenario of ping-pong reselection may be scenario 1 or scenario 2. At this time, the UE does not adopt a cell reselection mechanism for selecting a camped cell according to the number of goodbeams, but adopts a cell reselection mechanism for selecting the strongest cell for camping. For example, for scenario 2, even if the cell 1 configures a parameter, such as a ranging to bestcell, that needs to reselect the cell according to the good beam number, after determining that ping-pong reselection occurs, the UE needs to ignore the parameter configured by the cell 1 and used to reselect the cell according to the good beam number, and still select the cell reselection mechanism that camps on the strongest cell in the cell 1.
Further, after a period of time elapses or the UE finds that the signal quality of the cell changes, for example, the UE finds that the signal of the camped serving cell changes or the signal of the cell that has undergone ping-pong reselection before changes, the UE needs to resume performing cell reselection according to the parameters in the system message broadcast by the camped cell. Such as scenario 2 when the UE resides in cell 1, after a period of time, e.g., 10 seconds; or the UE finds that the signal quality of the cell 1 or the cell 2 changes, including changes according to the R sorting order, and the UE needs to resume performing cell reselection according to the system message of the cell 1, because the cell 1 broadcasts the parameters that the cell needs to be reselected according to the good beam number, the UE resumes the cell reselection mechanism for reselecting the cell according to the good beam number.
In order to avoid that the UE is prompted to perform ping-pong reselection again due to signal variation caused by fine signal jitter, the UE may set a threshold for the signal variation, and if the signal quality variation of the currently camped cell exceeds a preset threshold, or the signal quality variation of the cell in which ping-pong reselection occurs exceeds a preset threshold, the UE resumes performing cell reselection according to parameters in the system message broadcast by the camped cell.
According to the cell reselection method provided by the embodiment of the invention, the UE records the reselected cell within the preset time, and when the reselected times of the UE between at least two cells within the preset time exceed the preset times, the cell with the maximum RSRP in the at least two cells is selected to reside, so that the UE can be timely processed when frequently reselected between the two cells, the ping-pong reselection is eliminated, the UE is ensured to be smoothly accessed into a network, and the power consumption of the UE is reduced.
An embodiment of the present invention further provides a cell reselection apparatus, as shown in fig. 4, the apparatus includes:
a first determining unit 11, configured to determine at least two strong cells from an intra-frequency cell and a pilot-frequency cell with a priority equal to a current camping frequency;
a second determining unit 12, configured to determine, for the at least two strong cells, the number of beams included in each strong cell and exceeding a signal quality threshold, where the same-frequency cell, or the same-frequency cell and a different-frequency cell with the same priority as a current camping frequency use the same signal quality threshold;
a first selecting unit 13, configured to select a cell including the largest number of beams exceeding a signal quality threshold for camping.
Optionally, the first determining unit 11 is configured to determine a strongest cell according to RSRP of the co-frequency cell and the pilot frequency cell with the same priority as the current camping frequency, and then determine that a cell with a signal quality difference within a predetermined range from the strongest cell is a strong cell.
Optionally, the apparatus further comprises:
a second selecting unit, configured to select, when there are at least two cells including a cell with the largest number of beams that exceeds a signal quality threshold, a cell with the largest RSRP among the at least two cells to camp on.
Optionally, the interface signaling between the base stations carries a frequency and a signal quality threshold, or a frequency and a frequency priority and a signal quality threshold, so that all neighboring base stations use the same signal quality threshold when configuring neighboring cells with the same frequency or neighboring cells with the same frequency priority.
In the cell reselection device provided in the embodiment of the present invention, the UE determines at least two strong cells from the co-frequency cell and the inter-frequency cell having the same priority as the current camping frequency, determines the number of beams included in the at least two strong cells and exceeding a signal quality threshold, selects a cell having the largest number of beams exceeding the signal quality threshold for camping, and when there are at least two cells in the cell having the largest number of beams exceeding the signal quality threshold, the UE selects a cell having the largest RSRP among the at least two cells for camping. Because the same-frequency cells and the pilot frequency cells with the same priority as the current resident frequency adopt the same signal quality threshold value, the UE can be ensured to obtain a constant number when each cell determines the good beam number, the ping-pong reselection is avoided, and the power consumption of the UE is reduced and the UE is ensured to be smoothly accessed into the network.
The apparatus of this embodiment may be configured to execute the technical solution of the method embodiment corresponding to fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides another cell reselection apparatus, as shown in fig. 5, the apparatus includes:
a third determining unit 21, configured to determine a strongest cell from the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency when the UE finds a co-frequency neighboring cell in a cell reselection process, or when a pilot frequency cell with the same priority as the current resident frequency uses a different cell reselection mechanism;
a third selecting unit 22, configured to select the strongest cell for camping.
Optionally, the third determining unit 21 is configured to determine a strongest cell according to RSRP of the intra-frequency cell and the inter-frequency cell with the same priority as the current camping frequency.
Optionally, the different cell reselection mechanisms include a reselection mechanism that selects the strongest cell to camp on according to an RSRP ranking and a reselection mechanism that selects the cell to camp on according to a number of beams that exceeds a signal quality threshold.
The cell reselection device provided by the embodiment of the invention determines the strongest cell from the co-frequency cell and the pilot frequency cell with the same priority as the current resident frequency, and selects the strongest cell for residing. Because the strongest cell is constant, ping-pong reselection can be avoided, thereby reducing the power consumption of the UE and ensuring that the UE accesses the network smoothly.
The apparatus of this embodiment may be configured to execute the technical solution of the method embodiment corresponding to fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides another cell reselection apparatus, as shown in fig. 6, the apparatus includes:
a recording unit 31, configured to record a cell reselected by the UE within a predetermined time;
a fourth selecting unit 32, configured to select a cell with the largest RSRP among the at least two cells for camping when it is found that the number of times that the UE reselects between the at least two cells within the predetermined time exceeds a predetermined number of times.
Optionally, the apparatus further comprises:
and a fifth selecting unit, configured to, after a predetermined time elapses, or the UE finds that the signal quality of the camped cell changes, or the UE finds that the signal qualities of the at least two cells change, resume performing cell reselection according to the parameters in the system message broadcast by the camped cell.
According to the cell reselection device provided by the embodiment of the invention, the UE records the reselected cell within the preset time, and when the reselected times of the UE between at least two cells within the preset time exceed the preset times, the cell with the maximum RSRP in the at least two cells is selected to reside, so that the UE can be timely processed when frequently reselected between the two cells, the ping-pong reselection is eliminated, the UE is ensured to be smoothly accessed into a network, and the power consumption of the UE is reduced.
The apparatus of this embodiment may be configured to execute the technical solution of the method embodiment corresponding to fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides a user equipment, where the user equipment includes the cell reselection apparatus corresponding to fig. 4.
An embodiment of the present invention further provides a user equipment, where the user equipment includes the cell reselection apparatus corresponding to fig. 5.
An embodiment of the present invention further provides a user equipment, where the user equipment includes the cell reselection apparatus corresponding to fig. 6.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (21)

1. A method of cell reselection, comprising:
determining at least two strong cells from a same-frequency cell and a pilot frequency cell with the same priority as the current resident frequency;
for the at least two strong cells, determining the number of beams which exceed a signal quality threshold value and are contained in each strong cell, wherein the same-frequency cell or the same-frequency cell and a different-frequency cell with the same priority as the current resident frequency adopt the same signal quality threshold value;
and selecting the cell containing the largest number of beams exceeding the signal quality threshold value for camping.
2. The method of claim 1, wherein the determining at least two strong cells from an intra-frequency cell and an inter-frequency cell with a priority equal to a current camping frequency comprises: and determining the strongest cell according to the Reference Signal Received Power (RSRP) of the same-frequency cell and the pilot frequency cell with the same priority as the current resident frequency, and then determining the cell with the signal quality difference within a preset range with the strongest cell as the strong cell.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
and when at least two cells exist in the cell containing the largest number of beams exceeding the signal quality threshold value, selecting the cell with the largest RSRP in the at least two cells for camping.
4. The method according to claim 1 or 2, characterized in that the interface signaling between the base stations carries a frequency and a signal quality threshold value, or a frequency and a frequency priority and a signal quality threshold value, so that all neighboring base stations adopt the same signal quality threshold value when configuring co-frequency neighboring cells or neighboring cells of the same frequency priority.
5. A method of cell reselection, comprising:
when the UE finds a same-frequency adjacent cell or a different cell reselection mechanism is used by a different cell reselection mechanism with the same priority as the current resident frequency in the cell reselection process, determining a strongest cell from the same-frequency cell and the different-frequency cell with the same priority as the current resident frequency;
and selecting the strongest cell for residing.
6. The method of claim 5, wherein the determining the strongest cell from the intra-frequency cell and the inter-frequency cell with the same priority as the current camping frequency comprises: and determining the strongest cell according to the RSRP of the co-frequency cell and the pilot frequency cell with the priority same as the current resident frequency.
7. The method of claim 5 or 6, wherein the different cell reselection mechanisms comprise a reselection mechanism that selects the strongest cell to camp on in an RSRP ordering and a reselection mechanism that selects cell to camp on in a number of beams that exceeds a signal quality threshold.
8. A method of cell reselection, comprising:
recording a cell reselected by UE in a preset time;
and when the number of times that the UE reselects between the at least two cells within the preset time exceeds the preset number of times, selecting the cell with the maximum RSRP in the at least two cells for camping.
9. The method of claim 8, further comprising:
and after the preset time, or the UE finds that the signal quality of the resident cell changes, or the UE finds that the signal quality of the at least two cells changes, the UE resumes executing cell reselection according to the parameters in the system message broadcast by the resident cell.
10. A cell reselection apparatus, comprising:
the first determining unit is used for determining at least two strong cells from the same-frequency cell and the different-frequency cell with the same priority as the current resident frequency;
a second determining unit, configured to determine, for the at least two strong cells, a number of beams included in each strong cell and exceeding a signal quality threshold, where the same-frequency cell, or the same-frequency cell and a different-frequency cell with the same priority as a current camping frequency use the same signal quality threshold;
a first selecting unit, configured to select a cell including the largest number of beams exceeding a signal quality threshold for camping.
11. The apparatus according to claim 10, wherein the first determining unit is configured to determine a strongest cell according to RSRP of the intra-frequency cell and an inter-frequency cell with a priority equal to that of a current camping frequency, and then determine a cell with a signal quality difference within a predetermined range from the strongest cell as the strongest cell.
12. The apparatus of claim 10 or 11, further comprising:
a second selecting unit, configured to select, when there are at least two cells including a cell with the largest number of beams that exceeds a signal quality threshold, a cell with the largest RSRP among the at least two cells to camp on.
13. The apparatus according to claim 10 or 11, wherein the interface signaling between the base stations carries a frequency and a signal quality threshold, or a frequency and a frequency priority and a signal quality threshold, so that all neighboring base stations use the same signal quality threshold when configuring co-frequency neighboring cells or neighboring cells with the same frequency priority.
14. A cell reselection apparatus, comprising:
a third determining unit, configured to determine, when the UE finds an intra-frequency neighboring cell in a cell reselection process, or when a different cell reselection mechanism is used by a different cell from a different frequency cell having the same priority as a current resident frequency, a strongest cell from the intra-frequency neighboring cell and the different frequency cell having the same priority as the current resident frequency;
and a third selecting unit, configured to select the strongest cell for camping.
15. The apparatus of claim 14, wherein the third determining unit is configured to determine a strongest cell according to RSRP of the intra-frequency cell and an inter-frequency cell with a priority same as that of a current camping frequency.
16. The apparatus of claim 14 or 15, wherein the different cell reselection mechanisms comprise a reselection mechanism that selects the strongest cell to camp on in an RSRP ranking and a reselection mechanism that selects cell to camp on in a number of beams that exceeds a signal quality threshold.
17. A cell reselection apparatus, comprising:
the recording unit is used for recording a cell reselected by the UE within a preset time;
and a fourth selecting unit, configured to select a cell with a largest RSRP among the at least two cells for camping when it is found that the number of times that the UE reselects between the at least two cells within the predetermined time exceeds a predetermined number of times.
18. The apparatus of claim 17, further comprising:
and a fifth selecting unit, configured to, after a predetermined time elapses, or the UE finds that the signal quality of the camped cell changes, or the UE finds that the signal qualities of the at least two cells change, resume performing cell reselection according to the parameters in the system message broadcast by the camped cell.
19. A user equipment, characterized in that the user equipment comprises the cell reselection apparatus of any of claims 10 to 13.
20. A user equipment, characterized in that the user equipment comprises the cell reselection apparatus of any of claims 14 to 16.
21. A user equipment, characterized in that the user equipment comprises the cell reselection apparatus of claim 17 or 18.
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