| (11) | EP 3 043 600 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | METHOD AND APPARATUS FOR ADJUSTING CELL NETWORK CAMPING POLICY |
(57) The present invention relates to the field of mobile communications technologies, and in particular, to a method for adjusting a network camping policy of a cell, The method includes: determining, by a network side device according to traffic measurement of a first cell, whether the first cell is in a heavy traffic scenario; determining, by the network side device, whether the first cell is a preferential camping cell; adjusting, by the network side device after determining that the first cell is in the heavy traffic scenario and the first cell is the preferential camping cell, network camping policies of the first cell and a second cell to random camping, where the first cell and the second cell are inter-frequency co-coverage neighboring cells. In the method disclosed in the present invention, in a heavy traffic scenario, if it is determined that a target cell is preferential camping, preferential camping is adjusted to random camping. In this way, when a burst of services occurs in the heavy traffic scenario, the bursty services may be randomly sent to available carrier, thereby relieving system congestion, improving customer experience, and ensuring system capacity of a system when services received by the system are several times more than services that can be handled by the system. |
TECHNICAL FIELD
BACKGROUND
Load of a Neighboring Cell | Load of a Current Cell | Change of a Q'offset1 Value | Change of a Q'offset2 Value |
Light | Light | → | → |
Light | Normal | → | → |
Light | Heavy | ↘ | ↘ |
Normal | Light | → | → |
Normal | Normal | → | → |
Normal | Heavy | ↘ | ↘ |
Heavy | Light | → | → |
Heavy | Normal | ↗ | ↗ |
Heavy | Heavy | → | → |
SUMMARY
determining, by a network side device according to traffic measurement of a first cell, whether the first cell is in a heavy traffic scenario;
determining, by the network side device, whether the first cell is a preferential camping cell; and
adjusting, by the network side device after determining that the first cell is in the heavy traffic scenario and the first cell is the preferential camping cell, network camping policies of the first cell and a second cell to random camping, where the first cell and the second cell are inter-frequency co-coverage neighboring cells.
determining, by the network side device when the number of radio resource control RRC connection requests received by the first cell in a first duration is greater than or equal to a threshold on the number of RRC accesses, and a proportion of RRC connection requests rejected by the first cell in the first duration due to insufficient air interface resources to received RRC connection requests is greater than or equal to a first preset threshold, that the first cell is in a heavy traffic scenario; or
determining, by the network side device when the number of cell update requests received by the first cell in a second duration is greater than or equal to a threshold on the number of update requests, that the first cell is in a heavy traffic scenario; or
determining, by the network side device when the number of connected subscribers in the first cell is greater than or equal to a threshold on the number of subscribers, that the first cell is in a heavy traffic scenario.
determining, by the network side device according to a selection and reselection parameter of the first cell or a selection and reselection parameter of the second cell, or a Bar attribute of the second cell, whether the first cell is a preferential camping cell, where load of the second cell is less than a second threshold.
determining, by the network side device when a pilot measurement type of the first cell is measurement based on received signal code power RSCP and an idle signal quality offset 1 IdleQoffset1sn, configured on the first cell, of the second cell is greater than or equal to a first preferential camping threshold, that the first cell is a preferential camping cell; or
determining, by the network side device when a pilot measurement type of the first cell is measurement based on received signal code power RSCP and an IdleQoffset1sn, configured on the second cell, of the first cell is less than or equal to a second preferential camping threshold, that the first cell is a preferential camping cell; or
determining, by the network side device when a pilot measurement type of the first cell is measurement based on ECN0 and an idle signal quality offset 2 ldleQoffset2sn, configured on the first cell, of the second cell is greater than or equal to a third preferential camping threshold, that the first cell is a preferential camping cell; or
determining, by the network side device when a pilot measurement type of the first cell is measurement based on ECN0 and an idle signal quality offset 2 IdleQoffset2sn, configured on the second cell, of the first cell is less than or equal to a fourth preferential camping threshold, that the first cell is a preferential camping cell.
determining, by the network side device when determining, according to the Bar attribute of the second cell, that the second cell is a cell on which no subscriber is allowed to camp, that the network camping policy of the first cell is preferential camping.
adjusting, by the network side device, a reselection-starting measurement threshold IdleSintersearch of the first cell and the second cell to a first optimized value, where the first optimized value is greater than a reselection-starting measurement threshold that is set when the first cell is preferential camping.
if the second cell is a cell on which no subscriber is allowed to camp, adjusting, by the network side device, the bar attribute of the second cell, so that a subscriber is allowed to camp on the second cell.
if a system message 5 delivered by the first cell or the second cell includes an SsearchHCS parameter for starting inter-frequency reselection in a hierarchical cell structure scenario, adjusting, by the network side device, a value of the SsearchHCS parameter to a second optimized value.
after adjusting the network camping policy of the first cell to random camping, skipping performing, by the network side device for a subscriber who accesses the first cell, a direct retry or a redirection due to service layering.
a determining module, configured to determine, according to traffic measurement of a first cell, whether the first cell is in a heavy traffic scenario, and determine whether the first cell is a preferential camping cell; and
a camping policy adjusting module, configured to adjust, after it is determined that the first cell is in a heavy traffic scenario and the first cell is a preferential camping cell, network camping policies of the first cell and a second cell to random camping, where the first cell and the second cell are inter-frequency co-coverage neighboring cells.
a first determining unit, configured to determine, according to traffic measurement of the first cell, whether the first cell is in a heavy traffic scenario; and
a second determining unit, configured to determine, by the network side device according to a selection and preselection parameter of the first cell or a selection and reselection parameter of the second cell, or a Bar attribute of the second cell, whether the first cell is a preferential camping cell, where load of the second cell is less than a second threshold.
an RRC connection request quantity determining, subunit, configured to determine, when the number of radio resource control RRC connection requests received by the first cell in a first duration is greater than or equal to a threshold on the number of RRC accesses, and a proportion of RRC connection requests rejected by the first cell in the first duration due to insufficient air interface resources to received RRC connection requests is greater than or equal to a first preset threshold, that the first cell is in a heavy traffic scenario;
an update request quantity determining subunit, configured to determine, when the number of cell update requests received by the first cell in a second duration is greater than or equal to a threshold on the number of update requests, that the first cell is in a heavy traffic scenario; and
a subscriber quantity determining subunit, configured to determine, when the number of connected subscribers in the first cell is greater than or equal to a threshold on the number of subscribers, that the first cell is in a heavy traffic scenario.
a first selection and reselection parameter determining subunit, configured to, if a pilot measurement type of the first cell is measurement based on received signal code power RSCP, determine that the first cell is a preferential camping cell, if an idle signal quality offset 1 IdleQoffset1sn, configured on the first cell, of the second cell is greater than or equal to a first preferential camping threshold; or determine that the first cell is a preferential camping cell, if an IdleQoffset1sn, configured on the second cell, of the first cell is less than or equal to a second preferential camping threshold;
a second selection and reselection parameter determining subunit, configured to, if the pilot measurement type of the first cell is measurement based on ECN0, determine that the first cell is a preferential camping cell, if an idle signal quality offset 2 IdleQoffset2sn, configured on the first cell, of the second cell is greater than or equal to a third preferential camping threshold; or determine that the first cell is a preferential camping cell, if an idle signal quality offset 2 IdleQoffset2sn, configured on the second cell, of the first cell is less than or equal to a fourth preferential camping threshold; and
a Bar attribute determining subunit, configured to determine, when it is determined, according to the Bar attribute of the second cell, that the second cell is a cell on which no subscriber is allowed to camp, that a network camping policy of the first cell is preferential camping.
a first adjusting subunit, configured to adjust a reselection-starting measurement threshold IdleSintersearch of the first cell and the second cell to a first optimized value, where the first optimized value is greater than a reselection-starting measurement threshold that is set when the first cell is preferential camping;
a second adjusting subunit, configured to adjust, if a system message 5 delivered by the first cell or the second cell includes an SsearchHCS parameter for starting inter-frequency reselection enabling in a hierarchical cell structure scenario, a value of the SsearchHCS parameter to a second optimized value; and
a third adjusting subunit, configured to, if the second cell is a cell on which no subscriber is allowed to camp, adjust the bar attribute of the second cell, so that a subscriber is allowed to camp on the second cell.
a fourth adjusting subunit, configured to, after adjusting the network camping policy of the first cell to random camping, skip performing, for a subscriber who accesses the first cell, a direct retry or a redirection due to service layering.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a schematic networking diagram of service layering in the prior art;
FIG. 2 is a schematic flowchart of a method for adjusting a network camping policy of a cell according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a network side device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a determining module in a network side device according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a first determining unit in a network side device according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a second determining unit in a network side device according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a camping policy adjustment in a network side device according to an embodiment of the present invention; and
FIG. 8 is a schematic structural diagram of a radio network controller RNC according to an embodiment of the present invention.
DESCRIPTION OF EMBODIMENTS
Step 201: A network side device determines, according to traffic measurement of a first cell, whether the first cell is currently in a heavy traffic scenario.
A1. Determine, based on the number of RRC connection requests, whether the first cell is in a heavy traffic scenario.
When the number of radio resource control (RRC) connection requests received by the first cell in a first duration is greater than or equal to a threshold on the number of RRC connections, and a proportion of RRC connection requests rejected by the first cell in the first duration due to insufficient air interface resources to received RRC connection requests is greater than or equal to a first threshold, the network side device determines that the first cell is in a heavy traffic scenario.
During a process of an RRC connection, the network side device (an RNC, for example) allocates a resource to a UE, which is a process known as admission process; if no power or code resource is allocated, the RRC connection request is rejected due to insufficient air interface resources.
A2. Determine, based on the number of cell update requests, whether the first cell is in a heavy traffic scenario.
When the number of cell update requests received by the first cell in a second duration is greater than or equal to a threshold on the number of update requests, the network side device determines that the first cell is in a heavy traffic scenario.
A3. Determine, based on the current number of subscribers in a cell, whether the first cell is currently in a heavy traffic scenario.
B1. When a pilot measurement type of the first cell is measurement based on received signal code power (Received Signal Code Power, RSCP), and an idle signal quality offset 1 IdleQoffset1sn, configured on the first cell, of the second cell is greater than or equal to a first preferential camping threshold, the network side device determines that the first cell is a preferential camping cell.
In addition, the first cell and the second cell are neighboring cells. The practice of allowing a subscriber to preferentially camp on the first cell may be further implemented by configuring, on the second cell, an IdleQoffset1sn of the first cell (that is, it is determined, according to an IdleQofIset1sn in case of reverse neighbor relationship, that the network camping policy of the first cell is preferential camping). A specific implementation includes the following:
When the pilot measurement type of the first cell is measurement based on received signal code power RSCP, and the IdleQoffset1sn, configured on the second cell, of the first cell is less than or equal to a second preferential camping threshold, the network side device determines that the first cell is a preferential camping cell; in the most optimized implementation, the second preferential camping threshold may be an opposite number of the first preferential camping threshold (that is, first preferential camping threshold = (-1) x second preferential camping threshold).
The IdleQoffset 1 sn is used in the R criteria. Candidate cells available for cell selection and reselection are sorted by signal quality of a neighboring cell minus IdleQoffsetlsn, and according to a sorting result, a cell with the best signal quality is selected for access.
In this embodiment, if the first preferential camping threshold is a positive value (for example, 10), the second preferential camping threshold may be an opposite number (-10) of the first preferential camping threshold; the IdleQoffsetlsn, configured on the first cell, of the second cell and the IdleQoffsetlsn, configured on the second cell, of the first cell are two different configurations. For case of comparison, an opposite number relationship may also be established between the two parameters, that is, the IdleQoffset1sn, configured on the first cell, of the second cell is an opposite number of the IdleQoHset1sn, configured on the second cell, of the first cell.
B2. When the pilot measurement type of the first cell is measurement based on ECNO, and an idle signal quality offset 2 ldleQoffset2sn, configured on the first cell, of the second cell is greater than or equal to a third preferential camping threshold, the network side device determines that the first cell is a preferential camping cell.
In addition, the first cell and the second cell are neighboring cells. The practice of allowing a subscriber to preferentially camp on the first cell may be further implemented by configuring, on the second cell, an IdleQoffset2sn of the first cell (that is, it may be further determined, according to an IdleQoffset 1 sn in case of reverse neighbor relationship, that the network camping policy of the first cell is preferential camping). A specific implementation includes the following:
When the pilot measurement type of the first cell is measurement based on ECN0, and an idle signal quality offset 2 IdlcQoffset2sn, configured on the second cell, of the first cell is less than or equal to a fourth preferential camping threshold, the network side device determines that the network camping policy of the first cell is preferential camping.
In this embodiment, the IdleQoffset2sn, configured on the first cell, of the second cell and the IdleQoffset2sn, configured on the second cell, of the first cell are two different configurations. For ease of comparison, an opposite number relationship may also be established between the two parameters, that is, the IdleQoffset2sn, configured on the first cell, of the second cell is an opposite number of the IdleQoffset2sn, configured on the second cell, of the first cell.
B3. When determining, according to the Bar attribute of the second cell, that the second cell is a cell on which no subscriber is allowed to camp, the network side device determines that the network camping policy of the first cell is preferential camping.
C1. Processing for the first cell (that is, the preferential camping cell): The measurement threshold IdleSintersearch for starting preselection takes a preset first optimized value, and the preset first optimized value is greater than a reselection-starting measurement threshold that is set when the first cell is the preferential camping cell.
UE's behavior is to monitor a signal of the local cell, if signal quality is lower than the measurement threshold IdleSintersearch for starting preselection, inter-frequency measurement is started. "signal quality of the local cell + hysteresis" and "signal quality of a neighboring cell - IdleQoffset1sn" are compared, and if a vague of the neighboring cell is greater than that of the local cell, cell reselection is initiated. In case of preferential camping, to avoid reselection initiated by a subscriber in a preferential camping cell, the measurement threshold IdleSintersearch for starting reselection is set to a relatively small value, and the inter-frequency reselection) measurement is initiated only when signal quantity is lower than the IdleSintersearch, thereby ensuring implementation of the preferential camping. In a random camping scenario, a subscriber is allowed to perform reselection among multiple carriers, so as to acquire relatively high signal quality; in this case, the measurement threshold IdleSintersearch for starting preselection is adjusted to a larger value.
For a neighboring cell pair relationship that meets a preferential camping condition, an IdleQoffset1sn and an IdleQoffset2sn,that correspond to the neighboring cell pair relationship take a value of 0 or a relatively small absolute value. In addition, the IdleQoffset 1 sn is delivered in a system message 3 (SIB3) to the UE; and the IdleQoffset1sn is delivered in a system message 11 (SIB11) to the UE.
C2. Processing for the second cell (that is, a neighboring cell for blind handover): The measurement threshold IdleSintersearch for starting reselection takes the preset first optimized value. For a neighboring cell pair relationship that meets a preferential camping condition, an IdleQoffset1sn and an IdleQoffset2sn that correspond to the neighboring cell pair relationship take a value of 0 or a relatively small absolute value.
Further, if the second cell is a cell on which no subscriber is allowed to camp (that is, if the cell is Barred), the network side device adjusts the bar attribute of the second cell (performs unbarring processing), so that a subscriber is allowed to camp on the blind hanover neighboring cell.
The unBarring processing is to set the barred status in a system message 4 (SIB4) to cell not barred, that is, to allow a connected UE to camp on a cell.
a determining module 301, configured to determine, according to traffic measurement of a first cell, whether the first cell is in a heavy traffic scenario, and determine whether the first cell is a preferential camping cell; and
a camping policy adjusting module 302, configured to adjust, after it is determined that the first cell is in the heavy traffic scenario and the first cell is the preferential camping cell, network camping policies of the first cell and a second cell to random camping, where the first cell and the second cell are inter-frequency co-coverage neighboring cells.
a first determining unit 401, configured to determine, according to traffic measurement of the first cell, whether the first cell is in a heavy traffic scenario; and
a second determining unit 402, configured to determine, by the network side device according to a selection and reselection parameter of the first cell or a selection and reselection parameter of the second cell, or a Bar attribute of the second cell, whether the first cell is a preferential camping cell, where load of the second cell is less than a second threshold.
an RRC connection request quantity determining unit 501, configured to determine, when the number of radio resource control RNC connection requests received by the first cell in a first duration is greater than or equal to a threshold on the number of RRC accesses, and a proportion of RRC connection requests rejected by the first cell in the first duration due to insufficient air interface resources to received RRC connection requests is greater than or equal to a first preset threshold, that the first cell is in a heavy traffic scenario;
an update request quantity determining unit 502, configured to determine, when the number of cell update requests received by the first cell in a second duration is greater than or equal to a threshold on the number of update requests, that the first cell is in a heavy traffic scenario;
a subscriber quantity determining unit 503, configured to determine, when the number of connected subscribers in the first cell is greater than or equal to a threshold on the number of subscribers, that the first cell is in a heavy traffic scenario.
a first selection and reselection parameter determining subunit 601, configured to, if a pilot measurement type of the first cell is measurement based on received signal code power RSCP, determine that the first cell is a preferential camping cell, if an idle signal quality offset 1 IdleQoffset1sn, configured on the first cell, of the second cell is greater than or equal to a first preferential camping threshold; or determine that the first cell is a preferential camping cell, when an IdleQoffset1 sn, configured on the second cell, of the first cell is less than or equal to a second preferential camping threshold;
a second selection and reselection parameter determining subunit 602, configured to, if the pilot measurement type of the first cell is measurement based on ECN0, determine, that the first cell is a preferential camping cell, if an idle signal quality offset 2 IdlcQoffset2sn, configured on the first cell, of the second cell is greater than or equal to a third preferential camping threshold; or determine that the first cell is a preferential camping cell, when an idle signal quality offset 2 IdleQoffset2sn, configured on the second cell, of the first cell is less than or equal to a fourth preferential camping threshold;
a Bar attribute determining subunit 603, configured to determine, when it is determined, according to the Bar attribute of the second cell, that the second cell is a cell on which no subscriber is allowed to camp, that a network camping policy of the first cell is preferential camping.
a first adjusting subunit 701, configured to adjust a reselection-starting measurement threshold IdleSintersearch of the first cell and the second cell to a first optimized value, where the first optimized value is greater than a reselection-starting measurement threshold that is set when the first cell is preferential camping;
a second adjusting subunit 702, configured to adjust, if a system message 5 delivered by the first cell or the second cell includes a threshold parameter SsearchHCS for starting an inter-frequency reselection in a hierarchical cell structure scenario, a value of the SsearchHCS parameter to a second optimized value;
a third adjusting subunit 703, configured to, if the second cell is a cell on which no subscriber is hallowed to camp, adjust the bar attribute of the second cell, so that a subscriber is allowed to camp on the second cell;
a fourth adjusting subunit 704, configured to, after adjusting the network camping policy of the first cell to random camping, skip performing, for a subscriber who accesses the first cell, a direct retry or a redirection due to service layering.
determining , by a network, side device according to traffic measurement of a first cell, whether the first cell is in a heavy traffic scenario;
determining, by the network side device, whether the first cell is a preferential camping cell; and
adjusting, by the network side device after determining, that the first cell is in the heavy traffic scenario and the first cell is the preferential camping cell, network camping policy of the first cell and network camping policy of a second cell to random camping, wherein the first cell and the second cell are inter-frequency co-coverage neighboring cells.
determining, by the network side device when the number of radio resource control RRC connection requests received by the first cell in a first duration is greater than or equal to a threshold on the number of RRC accesses, and a proportion of RRC connection requests rejected by the first cell in the first duration due to insufficient air interface resources to the received RRC connection requests is greater than or equal to a first preset threshold, that the first cell is in a heavy traffic scenario; or
determining, by the network side device when the number of cell update requests received by the first cell in a second duration is greater than or equal to a threshold on the number of update requests, that the first cell is in a heavy traffic scenario; or
determining, by the network side device when the number of connected subscribers in the first cell is greater than or equal to a threshold on the number of subscribers, that the first cell is in a heavy traffic scenario.
determining, by the network side device according to a selection and preselection parameter of the first cell, or a selection and reselection parameter of the second cell, or a Bar attribute of the second cell, whether the first cell is a preferential camping cell, wherein load of the second cell is less than a second threshold.
determining, by the network side device when a pilot measurement type of the first cell is measurement based on received signal code power RSCP and an idle signal quality offset 1 IdleQoffset1sn, configured on the first cell, of the second cell is greater than or equal to a first preferential camping threshold, that the first cell is a preferential camping cell; or
determining, by the network side device when a pilot measurement type of the first cell is measurement based on RSCP and an IdleQoffset1sn, configured on the second cell, of the first cell is less than or equal to a second preferential camping threshold, that the first cell is a preferential camping cell; or
determining, by the network side device when a pilot measurement type of the first cell is measurement based on ECN0 and an idle signal quality offset 2 IdleQoffset2sn, configured on the first cell, of the second cell is greater than or equal to a third preferential camping threshold, that the first cell is a preferential camping cell; or
determining, by the network side device when a pilot measurement type of the first cell is measurement based on ECN0 and an idle signal quality offset 2 IdleQoffset2sn, configured on the second cell, of the first cell is less than or equal to a fourth preferential camping threshold, that the first cell is a preferential camping cell.
determining, by the network side device when determining, according to the Bar attribute of the second cell, that the second cell is a cell on which no subscriber is allowed to camp, that the first cell is a preferential camping cell,
adjusting, by the network side device, a reselection-starting measurement threshold, IdleSintersearch of the first cell and the second cell to a first optimized value, wherein the first optimized value is greater than a reselection-starting measurement threshold that is set when the first cell is preferential camping.
if the second cell is a cell on which no subscriber is allowed to camp, adjusting, by the network side device, the bar attribute of the second Cell, so that a subscriber is allowed to camp on the second cell.
if a system message 5, delivered by the first cell or the second cell, comprises an SsearchHCS parameter for starting inter-frequency preselection in a hierarchical cell structure scenario, adjusting, by the network side device, a value of the SsearchHCS parameter to a second optimized value.
after adjusting the network camping policy of the first cell to random camping, skipping performing, by the network side device for a subscriber who accesses the first cell, a direct retry or a redirection due to service layering.
a determining module, configured to determine, according to traffic measurement of a first cell, whether the first cell is in a heavy traffic scenario, and determine whether the first cell is a preferential camping cell; and
a camping policy adjusting module, configured to adjust, after it is determined that the first cell is in the heavy traffic scenario and the first cell is the preferential camping cell, network camping policy of the first cell and network camping policy of a second cell to random camping, wherein the first cell and the second cell are inter-frequency co-coverage neighboring cells.
a first determining unit, configured to determine, according to the traffic measurement of the first cell, whether the first cell is in a heavy traffic scenario; and
a second determining unit, configured to determine, according to a selection and reselection parameter of the first cell, or a selection and reselection parameter of the second cell, or a Bar attribute of the second cell, whether the first cell is a preferential camping cell, wherein load of the second cell is less than a second threshold.
an RRC connection request quantity determining subunit, configured to determine, when the number of radio resource control RRC connection requests received by the first cell in a first duration is greater than or equal to a threshold on the number of RRC accesses, and a proportion of RRC connection requests rejected by the first cell in the first duration due to insufficient air interface resources to the received RRC connection requests is greater than or equal to a first preset threshold, that the first cell is in a heavy traffic scenario;
an update request quantity determining subunit, configured to determine, when the number of cell update requests received by the first cell in a second duration is greater than or equal to a threshold on the number of update requests, that the first cell is in a heavy traffic scenario;
a subscriber quantity determining subunit, configured to determine, when the number of connected subscribers in the first cell is greater than or equal to a threshold on the number of subscribers, that the first cell is in a heavy traffic scenario.
a first selection and reselection parameter determining subunit, configured to, if a pilot measurement type of the first cell is measurement based on received signal code power RSCP, determine that the first cell is a preferential camping cell, if an idle signal quality offset 1 IdlceQoffset1sn, configured on the first cell, of the second cell is greater than or equal to a first preferential camping threshold; or determine that the first cell is a preferential camping cell, if an IdleQoffset1sn, configured on the second cell, of the first cell is less than or equal to a second preferential camping threshold;
a second selection and reselection parameter determining subunit, configured to, if the pilot measurement type of the first cell is measurement based on ECNO, determine that the first cell is a preferential camping cell, if an idle signal quality offset 2 IdleQoffset2sn, configured on the first cell, of the second cell is greater than or equal to a third preferential camping threshold; or determine that the first cell is a preferential camping cell, if an idle signal quality offset 2 IdleQoffset2sn, configured on the second cell, of the first cell is less than or equal to a fourth preferential camping threshold;
a Bar attribute determining subunit, configured to determine, when it is determined, according to the Bar attribute of the second cell, that the second cell is a cell on which no subscriber is allowed to camp, that a network camping policy of the first cell is preferential camping.
a first adjusting subunit, configured to adjust a reselection-starting measurement threshold IdleSintersearch of the first cell and the second cell to a first optimized value, wherein the first optimized value is greater than a reselection-starting measurement threshold that is set when the first cell is preferential camping;
a second adjusting subunit, configured to adjust, it a system message 5 delivered by the first cell or the second cell comprises an SsearchHCS parameter for starting inter-frequency preselection in a hierarchical cell structure scenario, a value of the SsearchHCS parameter to a second optimized value;
a third adjusting subunit, configured to, if the second cell is a cell on which no subscriber is allowed to camp, adjust the bar attribute of the second cell, so that a subscriber is allowed to camp on the second cell.
a fourth adjusting subunit, configured to, after adjusting the network camping policy of the first cell to random camping, skip performing, for a subscriber who accesses the first cell, a direct retry or a redirection due to service layering.