CN100574536C - Cell reselection processing method and user terminal thereof - Google Patents

Abstract

The invention discloses a cell reselection processing method, comprising steps: a user terminal in the state of receiving broadcast and multicast information selects a cell group that supports the broadcast and multicast information that the user terminal is receiving from among all measured cells; The terminal learns the priority frequency layer information of the broadcast multicast service indicated by UTRAN in the current serving cell where it is located; according to the learned information of the priority frequency layer of the broadcast multicast service, selects and joins the cell belonging to the priority frequency layer of the broadcast multicast service to the cell group; and select a reselection target cell in the cell group; the user terminal reselects and camps in the selected reselection target cell. Correspondingly, the invention also discloses a user terminal. The present invention can reduce the interruption probability of receiving broadcast and multicast information when the user terminal in the state of receiving broadcast and multicast information performs cell reselection processing.

Description

Cell reselection processing method and user terminal thereof

technical field

The present invention relates to cell reselection technology and broadcast multicast technology in the third generation mobile communication system (3G, The 3rd Generation), especially relates to a kind of cell reselection processing method and its user terminal.

Background technique

Universal Mobile Telecommunications System (UMTS, Universal Mobile Telecommunications System) is a third-generation mobile communication system using WCDMA air interface technology, mainly developed in the WCDMA/GSM global standardization organization 3GPP.

In order to effectively utilize the resources of the mobile communication network, the third generation mobile communication system introduces the concept of multicast and broadcast. The multicast and broadcast service is a technology to transmit the same data from one data source to multiple targets. Thus, the WCDMA/GSM global standardization organization 3GPP proposed Multimedia Broadcast/Multicast Service (MBMS, Multimedia Broadcast/Multicast Service). The so-called MBMS is to provide a data source in a mobile communication network to send the same data to multiple users. Multi-point services to realize network resource sharing and improve the utilization rate of network resources, especially the utilization rate of air interface resources.

The data transmission mode of MBMS service between UE and UTRAN can be divided into two types: point-to-point (PTP, Point to Point) mode and point-to-multipoint (PTM, Point to Multipoint) mode. Among them, the PTP mode is used in the multicast mode of MBMS, and the user terminal in the RRC connection mode in the multicast mode receives control information through a dedicated control channel (DCCH, Dedicated Control Channel) and through a dedicated traffic channel (DTCH, Dedicated Traffic Channel) Receive data information. The PTM mode is used in the broadcast or multicast mode of MBMS. In this mode, the user terminal receives data information through the MBMS point-to-multipoint Traffic Channel (MTCH, MBMS point-to-multipoint Traffic Channel), and transmits data through the MBMS point-to-multipoint traffic channel. The control channel (MCCH, MBMS point-to-multipoint Control Channel) receives control information.

In the cell, the user terminal obtains the available MBMS service information by receiving the MCCH information; also obtains the access information of the interested service by receiving the MBMS access information in the MCCH information, and sends a request to the UTRAN based on the access information.

In order to improve the gain of the user terminal receiving the MBMS PTM service and enhance the coverage, the user terminal can use the combination method to combine the MBMS PTM services received from different cells, that is, the user terminal can receive the same MBMS RB bit stream from different cells, and Combine the received MBMSRB bit streams.

The user terminal can combine the same MBMS PTM services received from different cells in two ways: selective combination and soft combination. The soft merger may also include some soft mergers. Selective combining is performed at the Radio Link Control (RLC, Radio Link Control1) layer, and soft combining is performed at the physical layer. These two combining methods are applied in the case that the user terminal receives the same MBMS PTM service from different cells with different time differences between different cells, and its soft combining is usually applied to the time delay difference between different cells that can receive the same MBMS PTM service. In the case of transmission time interval (TTI, Transmission Time Interval) + 1 time slot [that is, 1 TTI + 1 time slot], the selective combination is often applied to the case where the delay difference between different cells is greater than that of soft combination.

If selective combining or soft combining between different cells sending the same MBMS PTM service can be performed, UTRAN shall deliver the MBMS neighboring cell information of neighboring cells to the user terminal UE, and the delivered MBMS neighboring cell information includes Radio bearer configuration information of adjacent cells to be merged. At the same time, when partial soft combining is applied, the MBMS neighboring cell information sent by UTRAN also includes physical layer (L1) combining scheduling information, which is used to instruct the UE to perform soft combining of the same MBMS PTM service sent by the neighboring cell and the current serving cell. .

With the MBMS neighboring cell information, the UE can receive the data information carried on the MTCH of the neighboring cell without receiving the control information carried on the MCCH of the neighboring cell. When the user terminal UE receives the MBMS neighbor cell information of the neighbor cell delivered by the UTRAN, the UE can determine a suitable neighbor cell for subsequent selective combination or soft combination processing based on the measured signal quality. If the user terminal UE decides to perform selective combination or soft combination processing on neighboring cells, and the user terminal UE has correct MBMS neighboring cell information of the corresponding neighboring cell at this time, the user terminal will perform MBMS PTM service on the current serving cell and neighboring cells The selection merge or soft merge process.

For MBMS services, in order to ensure the effective use of resources, the concept of MBMS priority frequency layer is introduced in the 3GPP specification. The MBMS priority frequency layer means that in order to effectively use resources, the UTRAN side requires the priority selection of user terminals receiving certain MBMS services. On a certain frequency layer, the UTRAN sends the MBMS service on this frequency layer, and the priority frequency layer of each MBMS service is specifically indicated to the user terminal by the UTRAN. The user terminal receiving the MBMS service should camp in the priority frequency layer cell indicated by the UTRAN as much as possible. In addition, in order to ensure the mobility of the user terminal, the user terminal will perform cell reselection processing during the process of receiving the MBMS service.

Among them, the user terminal will perform cell reselection in all the cells that have been measured, and the conditions for the cell reselected by the user terminal to be satisfied are as follows (note: the "conditions to be met for reselecting a cell" mentioned below are specific refers to the condition):

a) According to the received quality criterion--R criterion (specific explanation of R criterion) for the measured cells that meet the S criterion (see the following description for the specific explanation of the S criterion) and meet certain conditions (see the following explanation for the specific explanation of the certain condition) For explanation, refer to the following instructions) for sorting;

b) If the following conditions are met at the same time, the user terminal will reselect to the cell with the best ranking above (the best ranking refers to the cell with the highest R value obtained by calculating and sorting according to the R criterion):

① The R value obtained by calculating the measured new cell according to the R criterion is always higher than the R value of the current serving cell where the user terminal is located within a specified time interval;

② The user terminal stays in the current serving cell for more than 1 second.

Wherein the "certain conditions" mentioned above that the cells that can participate in the sorting process need to meet are different according to whether the current serving cell where the user terminal is located uses a cell hierarchical structure (HCS, hierarchy cell structure):

For cells that do not use HCS, all cells that meet the S criterion measured by the user terminal must be sorted by the R criterion;

For cells using HCS:

When the user terminal is in low mobility, the user terminal with the highest HCS level in the cell that satisfies H≥0 (the H value refers to the value obtained by calculating the cell using the H criterion, the specific explanation of the H criterion refers to the following description) All the measured cells that meet the S criterion are sorted by the R criterion; if there is no cell that satisfies H≥0, all the cells that have been measured by the user terminal and meet the S criterion are sorted by the R criterion;

When the user terminal is in high mobility, for all cells that meet the S criterion that the user terminal has measured:

① If there is a cell with a lower HCS level than the current serving cell where the user terminal is located in the cells that satisfy H≥0, select the highest HCS level from the cells that satisfy H≥0 and are lower than the HCS level of the current serving cell where the user terminal is located The sub-districts of the selected sub-districts are subjected to R criterion ordering processing;

② If there is a cell with the same HCS level as the current serving cell where the user terminal is located in or a cell with a higher HCS level than the current serving cell where the user terminal is located in the cell that satisfies H≥0, then from the cell that satisfies H≥0 and has the same HCS level as the current serving cell where the user terminal is located Select the cell with the lowest HCS level from the cells with the same HCS level of the serving cell or higher than the HCS level of the current serving cell where the user terminal is located, and perform the R criterion sorting process on these selected cells;

③ If there is no cell that satisfies H≥0, all the cells that satisfy the S criterion measured by the user terminal are sorted by the R criterion.

The S criterion mentioned above is as follows:

For FDD cells: Srxlev>0 and Squal>0;

For TDD cells: Srxlev>0;

For GSM cells: Srxlev>0;

in:

Squal=Q _qualmeas -Qqualmin;

Srxlev＝ _Qrxlevmeas -Qrxlevmin-Pcompensation

The specific explanation of each parameter value in the above formula is shown in the following table:

Squal Cell selection quality, only applicable to FDD cells Srxlev Cell selection reception level Q_qualmeas Measured cell quality, only applicable to FDD cells Q_rxlevmeas Measured cell reception level Qqualmin The minimum quality level required in the cell, only applicable to FDD cells Qrxlevmin The minimum reception level required in the cell Compensation max(UE_TXPWR_MAX_RACH-P_MAX, 0) UE_TXPWR_MAX_RACH The maximum transmit power that a UE may use when accessing a cell via RACH P_MAX UE maximum RF transmit power

The H criterion mentioned above is as follows:

H _s = Q _{meas, s} - Qhcs _s ;

H _n = Q _{meas, n} - Qhcs _n - TO _n × L _n ;

The R criterion mentioned above is as follows (wherein R _s is the calculation formula of the current serving cell where the user terminal is located; R _n is the calculation formula of the user terminal adjacent cell):

R _s = Q _{meas, s} + Qhyst _s + Qoffmbms;

R _n = Q _{meas, n} - Qoffset _{s, n} + Qoffmbms - TO _n × (1 - L _n );

The parameters in the above formula are explained as follows:

Q _meas : Represents the received signal quality value of the cell; for FDD cells, it refers to the CPICH Ec/N0 value or CPICH RSCP value; for TDD cells, it refers to the PCCPCH RSCP value; for GSM cells, it refers to the average received signal level value. Wherein, Q _{meas, s} is for the current serving cell where the user terminal is located, and Q _{meas, n} is for the neighboring cells of the user terminal.

Qhcs _s , Qhcs _n : Represents the quality threshold for cell reselection when HCS is applied; where Qhcs _s is for the current serving cell where the user terminal is located, and Qhcs _n is for the neighbor cell of the user terminal; where Qhcs _s , Qhcs _n is broadcast and sent by UTRAN through system broadcast information.

Qhyst _s represents the hysteresis value, which is broadcast and sent by UTRAN through system broadcast information.

Qoffset _{s, n} represents the offset value between the current serving cell where the user terminal is located and the neighboring cell, and this value is broadcast and sent by UTRAN through system broadcast information.

Qoffmbms is an additional offset value belonging to cells in the MBMS priority frequency layer (including the current serving cell and neighboring cells where the user terminal is located), which is broadcast and sent by UTRAN through system broadcast information.

in:

TO _n = TEMP_OFFSET _n × W(PENALTY_TIME _n - T _n );

L _n = 0 if HCS_PRIO _n = HCS_PRIO _s ;

L _n = 1 if HCS_PRIO _n <> HCS_PRIO _s ; (where <> means not equal)

W(x)＝0 for x＜0;

W(x)=1 for x≥0; where x represents the calculated value of PENALTY_TIME _n -T _n in the formula.

In the above formula:

HCS_PRIO represents the HCS level of the current serving cell and the adjacent cell where the user terminal is located, where HCS_PRIO _s is for the current serving cell where the user terminal is located, and HCS_PRIO _n is for the adjacent cell of the user terminal, and the value is UTRAN broadcasts and sends through system broadcast information.

TEMP_OFFSET _n is the offset value used in the calculation of the H criterion and the R criterion by the neighboring cell of the user terminal within the time period of PENALTY_TIME _n , and this value is broadcast and sent by the UTRAN through the system broadcast information.

PENALTY_TIME _n is the duration applied by TEMP_OFFSET _n , which is broadcast by UTRAN through system broadcast information.

TEMP_OFFSET _n and PENALTY_TIME _n are only applied when system information indicates that HCS is used.

The TEMP_OFFSET _n is applied only after the timer T _n is started, and each adjacent cell starts a timer T _n .

If the HCS level of the adjacent cell of the user terminal is not equal to that of the current serving cell, the received information quality value Q _meas,n of the adjacent cell of the user terminal is greater than the cell reselection quality threshold Qhcs _n of the adjacent cell issued by the system; if the user terminal When the HCS level of the adjacent cell of the user terminal is equal to the HCS level of the current serving cell, the received information quality value Q _{meas, n} of the adjacent cell of the user terminal is greater than the received information quality value of the current serving cell where the user terminal is located + offset (Q _{meas, s} + Qoffset _{s, n} ), at this time, the timer T _n starts counting from 0, as long as the above two conditions are no longer satisfied, the timer T _n in the relevant adjacent cell will stop counting. As long as the timer T _n is running, the calculated value of TO _n is correct, otherwise TO _n is set to 0.

If the adjacent cell corresponding to the timer T _n is no longer the adjacent cell of the current new serving cell, or the above two conditions can no longer be satisfied according to the parameters of the current new serving cell, the timer T _n will stop counting; if the timer The neighbor cell corresponding to T _n is still the neighbor cell of the current new serving cell, and the timer T _n will continue to run.

At present, the main implementation process of the user terminal performing cell reselection processing is as follows:

1) The user terminal measures all neighboring cells;

2) The user terminal selects a reselection target cell that meets the conditions to be met for the reselection cell from among all measured neighboring cells according to the "conditions to be met for cell reselection" described above;

3) The user terminal reselects to the reselection target cell selected above, and camps in the cell, thereby completing the cell reselection process.

However, when performing cell reselection processing for user terminals receiving MBMS services, if a qualified reselection target cell is selected from all measured neighboring cells according to the above-mentioned "conditions to be met for cell reselection", it is possible There may be a selected reselection target cell that cannot support the MBMS service that the user terminal is receiving, or the user terminal does not know the MTCH configuration of the selected reselection target cell, then the user terminal reselects to the selected reselection target When the cell is disconnected, the reception of the MBMS service will be interrupted.

Contents of the invention

The technical problem to be solved by the present invention is to propose a cell reselection processing method, so that the user terminal in the state of receiving broadcast multicast information can reduce the interruption probability of receiving broadcast multicast information when performing cell reselection processing.

Correspondingly, the present invention also proposes a user terminal.

In order to solve the above problems, the technical scheme proposed by the present invention is as follows:

A cell reselection processing method, comprising the steps of:

A. The user terminal in the state of receiving broadcast and multicast information selects a group of cells that support the broadcast and multicast information that the user terminal is receiving from all the cells that have been measured;

B. The user terminal obtains the broadcast multicast service priority frequency layer information indicated by UTRAN in its current serving cell; according to the learned broadcast multicast service priority frequency layer information, it will belong to the cell in the broadcast multicast service priority frequency layer Opting out to join the group of communities;

C. Selecting a reselection target cell in the cell group;

D. The user terminal reselects and camps in the selected reselection target cell.

Preferably, in the step A, the user terminal determines the cell that can support the broadcast and multicast information received by itself according to the broadcast and multicast radio bearer information issued by the UTRAN in the current serving cell where it is located.

Preferably, in the step A, the user terminal determines the cells that can support the broadcast and multicast information received by itself according to the cell information list stored by itself.

Preferably, said step A also includes the steps of:

Pre-set the cell broadcast channel receiving quality threshold;

The user terminal further selects cells whose broadcast channel reception quality is higher than the preset cell broadcast channel reception quality threshold among the selected cells that support the broadcast and multicast information being received by the user terminal to form the cell group.

Preferably, in the step C, the user terminal selects a corresponding cell in the cell group as the reselection target cell based on the conditions to be met for reselecting the cell.

Preferably, the broadcast and multicast information received by the user terminal includes broadcast and multicast information of different levels; the step C specifically includes the steps of:

The user terminal selects each cell in the cell group that meets the conditions required for reselecting the cell;

And among the selected cells, a cell that can support the highest level of broadcast and multicast information received by the user terminal is selected as the reselection target cell.

Preferably, the broadcast and multicast information received by the user terminal includes broadcast and multicast information of different levels; the step C specifically includes the steps of:

The user terminal selects each cell in the cell group that meets the conditions required for reselecting the cell;

For each selected cell, according to the level of broadcast and multicast information that each cell can support, add the corresponding level weight value to the R criterion calculation value of the corresponding cell;

The various sub-districts are sorted according to the size of the R criterion calculation value after adding the grade weight value processing;

And select the cell with the largest calculated value of the R criterion as the reselection target cell.

Preferably, the broadcast and multicast information received by the user terminal includes broadcast and multicast information of different levels; the step A also includes the steps of:

The user terminal further selects cells that can support the highest-level broadcast and multicast information it receives from among the selected cells that support the broadcast and multicast information it is receiving to form the cell group.

Preferably, if the user terminal cannot select a reselection target cell in step C, the method further includes the steps of:

The user terminal selects the corresponding cell as the reselection target cell from all the measured cells based on the conditions to be met for reselecting the cell; and

Reselect to camp in the reselection target cell.

Preferably, after the step D, the user terminal further includes the step of continuing to receive broadcast and multicast information in the reselected target cell.

Preferably, the broadcast and multicast information is:

broadcast multicast service information; and/or

Broadcast multicast control information.

A cell reselection processing method, comprising the steps of:

A. The user terminal in the state of receiving broadcast and multicast information selects a group of cells that support the broadcast and multicast information that the user terminal is receiving from all the cells that have been measured;

B. The user terminal selects each cell in the group of cells that meets the conditions for reselecting the cell; the broadcast and multicast information received by the user terminal includes broadcast and multicast information of different levels, and for each selected cell, According to the broadcast and multicast information level that each community can support, add the corresponding level weight value to the R criterion calculation value of the corresponding community; Sorting; and selecting the cell with the largest calculated value of the R criterion as the reselection target cell;

C. The user terminal reselects and camps in the selected reselection target cell.

A user terminal, comprising:

The first selection unit is used to select a group of cells that support the broadcast and multicast information that the user terminal is receiving from all the cells that have been measured when the user terminal is in the state of receiving broadcast and multicast information;

The obtaining unit is used to obtain the priority frequency layer information of the broadcast multicast service indicated by UTRAN in the current serving cell;

A third selection unit, configured to select cells belonging to the broadcast multicast service priority frequency layer and add them to the cells selected by the first selection unit according to the broadcast multicast service priority frequency layer information obtained by the learning unit group;

a second selection unit, configured to select a reselection target cell from the cell group obtained by the third selection unit;

The first reselection unit is configured to reselect to camp in the reselection target cell selected by the second selection unit.

Preferably, the user terminal further includes:

a judging unit, configured to judge whether the second selecting unit can select a reselection target cell;

A fourth selection unit, configured to select a corresponding cell from all measured cells as a reselection target cell based on the conditions to be met by the reselection cell when the judgment result of the judgment unit is No;

The second reselection unit is configured to reselect to camp in the reselection target cell selected by the fourth selection unit.

Preferably, the user terminal further includes an information receiving unit, configured to continue receiving broadcast and multicast information in the reselection target cell reselected by the first reselection unit.

The beneficial effect that the present invention can reach is as follows:

According to the solution of the present invention, the user terminal in the state of receiving broadcast and multicast information selects the cell group that supports the broadcast and multicast information that the user terminal is receiving from all the cells that have been measured, and selects and reselects the target cell based on the cell group, and the user The terminal reselects to camp in the selected reselection target cell, or chooses to continue receiving broadcast and multicast information in the reselected reselection target cell. In this way, the user terminal can select a suitable cell as the reselection target cell among the cells that support the broadcast and multicast information received by itself, instead of selecting according to the "conditions to be met by the reselected cell" among all the measured cells The cell with the largest calculation value of the R criterion is used as the target cell for reselection, so that the user terminal can reselect to the cell that supports the broadcast and multicast information received by itself to the maximum extent, and effectively avoids the user terminal that is receiving broadcast and multicast information In the process of cell reselection, the phenomenon of interruption of receiving broadcast and multicast information may be caused, which better reduces the probability that the user terminal itself is interrupted in receiving broadcast and multicast information due to cell reselection.

Description of drawings

Fig. 1 is the main realization principle flowchart of the cell reselection processing method of the present invention;

FIG. 2 is a schematic structural diagram of the main components of the user terminal of the present invention;

FIG. 3 is a schematic structural diagram of the main components of the user terminal in the present invention to select cells in the priority frequency layer of the broadcast multicast service;

FIG. 4 is a schematic structural diagram of an embodiment of the present invention to ensure that a user terminal can select a suitable reselection target cell.

Detailed ways

In order to avoid the possible interruption of the received MBMS service caused by the user terminal in the process of cell reselection in the prior art, the present invention proposes the following processing method for the user terminal to reselect the cell, so that When the user terminal receiving the MBMS service selects the reselection target cell among all the cells that have been measured, the corresponding judgment criterion is added, so that the user terminal can select the reselection target cell that supports the MBMS service it is receiving as much as possible, instead of Select the target cell for reselection from all measured cells according to the existing "conditions to be met for cell reselection", so that the user terminal can continue to receive the MBMS being received after reselecting to the selected target cell for reselection The purpose of business is to reduce the interruption probability of MBMS service received by itself.

The main realization principle and specific implementation manners of the present invention will be described in detail below with reference to each accompanying drawing.

Please refer to Fig. 1, this figure is the main realization principle flowchart of the cell reselection processing method of the present invention, and its main realization process is as follows:

Step S10, the user terminal UE in the state of receiving the broadcast and multicast information selects a group of cells that support the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

The UE can, but is not limited to, select cells that can support broadcast and multicast information received by itself from all measured cells in the following manner to form the cell group:

According to the broadcast multicast radio bearer information issued by the UTRAN in the current serving cell where it is located, the UE determines the information of each cell that can support the broadcast and multicast information received by itself in all the measured cells; or

According to the cell information list stored by itself, the UE determines the information of each cell that can support the broadcast and multicast information received by itself among all the cells that have been measured.

In step S20, the UE selects a suitable reselection target cell from the above-mentioned selected cell group; there may be various specific implementation methods for the UE to select a suitable re-selection target cell from the above-mentioned selected cell group, as follows It will be described in the description of each specific embodiment.

In step S30, the UE reselects to camp on the selected reselection target cell.

Step S40, if the UE has not finished receiving the broadcast and multicast information being received, continue to receive the broadcast and multicast information in the reselected reselected target cell.

If in the above step S20, the UE does not select a suitable reselection target cell in the cell group, then according to the existing scheme, select a suitable The reselection target cell, and then the UE reselects and camps in the reselection target cell.

The following will combine the main implementation principles of the method of the present invention to describe in detail the implementation of each specific implementation of the solution of the present invention. The first case is an embodiment where the broadcast and multicast information currently being received by the UE is single-level broadcast and multicast information. :

Example 1:

a1) The UE in the state of receiving broadcast and multicast information selects a cell group that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

a2) The UE selects the corresponding cell in the above cell group as the reselection target cell based on the "conditions to be met for cell reselection";

a3) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Example 2:

b1) The UE in the state of receiving broadcast and multicast information selects a cell group that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

b2) The UE obtains the priority frequency layer information of the broadcast multicast service indicated by the UTRAN in the current serving cell where it is located;

b3) The UE selects cells belonging to the broadcast and multicast service priority frequency layer according to the learned broadcast and multicast service priority frequency layer information to join the above cell group;

b4) The UE selects the corresponding cell in the cell group as the reselection target cell based on the "conditions to be met for reselecting the cell";

b5) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Example 3:

c1) Preset the cell broadcast channel reception quality threshold, where the threshold can be set locally in the UE, or can be sent to the UE periodically by the UTRAN;

c2) The UE in the state of receiving the broadcast and multicast information selects each cell that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

c3) The UE further selects each cell whose broadcast channel reception quality is higher than the above-mentioned preset cell broadcast channel reception quality threshold among the above-mentioned selected cells that support the broadcast and multicast information that it is receiving, to form the cell group;

c4) The UE selects the corresponding cell in the cell group as the reselection target cell based on the "conditions to be met for reselecting the cell";

c5) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Example 4:

d1) Pre-setting the cell broadcast channel reception quality threshold, where this threshold can be set locally in the UE, or can be sent to the UE by UTRAN on a regular basis;

d2) The UE in the state of receiving the broadcast and multicast information selects each cell that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

d3) The UE further selects each cell whose broadcast channel reception quality is higher than the above-mentioned preset cell broadcast channel reception quality threshold among the above-mentioned selected cells that support the broadcast and multicast information that it is receiving, to form the cell group;

d4) The UE obtains the broadcast and multicast service priority frequency layer information indicated by the UTRAN in its current serving cell;

d5) The UE selects cells belonging to the broadcast and multicast service priority frequency layer according to the learned broadcast and multicast service priority frequency layer information to join the above cell group;

d6) The UE selects the corresponding cell in the cell group as the target cell for reselection based on the "conditions to be met for cell reselection";

d7) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

The second case is an embodiment where the broadcast and multicast information currently being received by the UE includes broadcast and multicast information of different levels:

Example 5:

A1) The UE in the state of receiving broadcast and multicast information selects a cell group that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

A2) The UE selects each cell that meets the conditions for reselecting the cell from the above cell group;

A3) The UE selects a cell that can support the highest level of broadcast and multicast information received by the UE among the cells selected above, as the reselection target cell;

A4) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Embodiment 6:

B1) The UE in the state of receiving the broadcast and multicast information selects a cell group that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

B2) The UE obtains the priority frequency layer information of the broadcast multicast service indicated by the UTRAN in the current serving cell where it is located;

B3) The UE selects the cells belonging to the broadcast and multicast service priority frequency layer according to the learned broadcast and multicast service priority frequency layer information to join the above cell group;

B4) The UE selects each cell that meets the conditions required for reselecting the cell in the above cell group;

B5) The UE selects a cell that can support the highest level of broadcast and multicast information received by the UE among the cells selected above, as the reselection target cell;

B6) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Embodiment 7:

C1) Preset the cell broadcast channel reception quality threshold, where the threshold can be set locally in the UE, or can be sent to the UE periodically by the UTRAN;

C2) The UE in the state of receiving the broadcast and multicast information selects each cell that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

C3) The UE further selects each cell whose broadcast channel reception quality is higher than the above-mentioned preset cell broadcast channel reception quality threshold among the above-mentioned selected cells that support the broadcast and multicast information that it is receiving, to form the cell group;

C4) The UE selects each cell that meets the conditions for reselecting the cell from the above cell group;

C5) The UE selects a cell that can support the highest level of broadcast and multicast information received by the UE among the cells selected above, as the reselection target cell;

C6) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Embodiment 8:

D1) Pre-setting the cell broadcast channel reception quality threshold, where the threshold can be set locally in the UE, or can be sent to the UE by UTRAN on a regular basis;

D2) The UE in the state of receiving the broadcast and multicast information selects each cell that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

D3) The UE further selects each cell whose broadcast channel reception quality is higher than the above-mentioned preset cell broadcast channel reception quality threshold among the above-mentioned selected cells that support the broadcast and multicast information that it is receiving, to form the cell group;

D4) The UE obtains the priority frequency layer information of the broadcast multicast service indicated by the UTRAN in the current serving cell where it is located;

D5) The UE selects the cells belonging to the broadcast multicast service priority frequency layer according to the learned broadcast multicast service priority frequency layer information to join the above cell group;

D6) The UE selects each cell that meets the conditions required for the reselected cell in the above cell group;

D7) The UE selects a cell that can support the highest level of broadcast and multicast information received by the UE among the cells selected above, as the reselection target cell;

D8) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Embodiment 9:

E1) The UE in the state of receiving broadcast and multicast information selects a cell group that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

E2) The UE selects each cell that meets the conditions for reselecting the cell from the above cell group;

E3) For each cell selected above, according to the broadcast multicast information level that each cell can support, the UE adds the corresponding level weight value to the R criterion calculation value of the corresponding cell;

E4) The UE sorts the above-mentioned cells according to the size of the calculated value of the R criterion after adding the grade weight value;

E5) The UE selects the cell with the largest calculation value of the R criterion as the reselection target cell according to the above sorting result;

E6) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Example 10:

Steps F1) to F3) are the same as steps B1) to B3) in the above-mentioned embodiment 6;

Steps F4) to F8) are the same as steps E2) to E6) in the above-mentioned embodiment 9.

Example 11:

Steps G1) to G3) are the same as steps C1) to C3) in the above-mentioned embodiment 7;

Steps G4) to G8) are the same as steps E2) to E6) in the above-mentioned embodiment 9.

Example 12:

Steps H1) to H5) are the same as steps D1) to D5) in the above-mentioned embodiment 8;

Steps H6) to H10) are the same as steps E2) to E6) in Example 9 above.

Example 13:

I1) The UE in the state of receiving the broadcast and multicast information selects each cell that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

I2) The UE further selects each cell that can support the highest-level broadcast and multicast information received by itself from among the selected cells that support the broadcast and multicast information that it is receiving to form the cell group;

I3) The UE selects a reselection target cell in the above cell group;

I4) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Example 14:

Steps J1) to J2) are the same as steps I1) to I2) in the above-mentioned embodiment 13;

Steps J3) to J4) are the same as steps B2) to B3) in the above-mentioned embodiment 6;

Steps J5) to J6) are the same as steps I3) to I4) in the above-mentioned embodiment 13.

Example 15:

K1) Preset the cell broadcast channel reception quality threshold, where the threshold can be set locally in the UE, or can be sent to the UE periodically by the UTRAN;

K2) The UE in the state of receiving the broadcast and multicast information selects each cell that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured;

K3) The UE further selects each cell whose broadcast channel reception quality is higher than the preset cell broadcast channel reception quality threshold among the above-mentioned selected cells that support the broadcast and multicast information that it is receiving;

K4) The UE further selects each cell that can support the highest level of broadcast and multicast information received by itself among the selected cells that are higher than the preset cell broadcast channel reception quality threshold to form the cell group;

K5) The UE selects a reselection target cell in the above cell group;

K6) The UE reselects to camp in the reselected target cell selected above, and chooses to continue receiving broadcast and multicast information.

Example 16:

Steps L1) to L4) are the same as steps K1) to K4) in the above-mentioned embodiment 15;

Steps L5) to L6) are the same as steps B2) to B3) in the above-mentioned embodiment 6;

Steps L7) to L8) are the same as steps K5) to K6) in the above-mentioned embodiment 15.

The broadcast and multicast information mentioned in the above process can be but not limited to:

Broadcast multicast service information (such as multimedia broadcast multicast point-to-multipoint service information, that is, MTCH information);

Broadcast multicast control information (such as multimedia broadcast multicast point-to-multipoint control information, that is, MCCH information), etc.

In summary, the user terminal cell reselection processing method proposed by the present invention adds new judgment criteria when the user terminal receiving the MBMS service performs cell sorting and selects the reselection target cell, so as to support the MBMS service received by itself. Select a suitable cell from among the cells as the target cell for reselection, instead of selecting the cell with the largest R criterion calculation value according to the "conditions to be met by the reselected cell" among all the cells that the user terminal has measured, so as to realize the user terminal It can maximize the reselection to the cell that supports the MBMS service received by itself, effectively avoiding the interruption probability generated by the user terminal in the process of receiving the MBMS service.

Corresponding to the above-mentioned cell reselection processing method proposed in the present invention, the present invention also proposes a user terminal here, please refer to FIG. , the second selection unit 20, the first reselection unit 30 and the information receiving unit 40, wherein the main functions of each component are as follows:

The first selection unit 10 is mainly used to select the cell group that supports the broadcast and multicast information that the UE is receiving from all the cells that have been measured when the UE is in the state of receiving broadcast and multicast information; wherein the first selection unit 10 How to select a cell that can support the broadcast multicast service received by itself from all the cells that have been measured can refer to the relevant description in the above method, and will not be repeated here.

The second selection unit 20 is mainly used to select a reselection target cell in the cell group selected by the first selection unit 10; wherein how the second selection unit 20 further selects the cell group selected by the first selection unit 10 For the different processing ways of selecting the reselection target cell, reference may be made to the related description in the above method, which will not be repeated here.

The first reselection unit 30 is mainly used for reselecting to camp in the reselection target cell selected by the above-mentioned second selection unit 20 .

The information receiving unit 40 is mainly used for continuing to receive the broadcast multicast information in the reselection target cell reselected by the first reselection unit 30 when the UE has not finished receiving the broadcast multicast information being received.

Please refer to FIG. 3, which is a schematic diagram of the main composition and structure of the user terminal in the present invention to select cells in the priority frequency layer of the broadcast multicast service. On the basis of the above composition structure in FIG. 2, it further includes a learning unit 50 and the third selection unit 60, the main functions of these two newly added components are as follows:

The obtaining unit 50 is mainly used to obtain the priority frequency layer information of broadcast and multicast services indicated by UTRAN in the current serving cell;

The third selection unit 60 is mainly used to select the cells belonging to the broadcast multicast service priority frequency layer according to the broadcast multicast service priority frequency layer information obtained by the above-mentioned learning unit 50, and add them to the above-mentioned first selection unit 10 in the selected cluster.

Please refer to FIG. 4, which is a schematic diagram of the composition structure of an embodiment to ensure that the user terminal of the present invention can select a suitable reselection target cell. It further includes a judging unit 70, a fourth The selection unit 80 and the second reselection unit 90, wherein the main functions of newly added components are as follows:

The judging unit 70 is mainly used to judge whether the above-mentioned second selecting unit 20 can select a reselection target cell;

The fourth selection unit 80 is mainly used to select the corresponding cell from all the measured cells as the reselection target cell based on the "conditions to be met for reselecting the cell" when the judgment result of the above judgment unit 70 is No;

The second reselection unit 90 is mainly used to reselect to camp in the reselection target cell selected by the fourth selection unit 80 .

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (15)

1, a kind of cell reselection processing method is characterized in that, comprises step:

A, be in and receive broadcast multicast information state user terminal is down selected the broadcast multicast information that the support user terminal receiving in all sub-districts of having measured area group;

B, user terminal are known the broadcasting multicast service preferential frequencies layer information of UTRAN indication in the current service cell at self place; According to the broadcasting multicast service preferential frequencies layer information of knowing, the cell selecting that will belong in this broadcasting multicast service preferential frequencies layer goes out to join in the described area group;

C, in described area group, select the gravity treatment Target cell;

D, user terminal gravity treatment are stationed in the gravity treatment Target cell of selecting.

2, the method for claim 1 is characterized in that, the sub-district of the broadcast multicast information that the broadcast group broadcast radio bearer information that user terminal issues according to the current service cell of UTRAN at self place in the described steps A is determined to support that self receives.

3, the method for claim 1 is characterized in that, user terminal comes the definite sub-district that can support the broadcast multicast information that self receives according to the cell information tabulation of self storing in the described steps A.

4, the method for claim 1 is characterized in that, also comprises step in the described steps A:

Set in advance CBCH quality of reception threshold value;

User terminal is further selected each sub-district that the broadcast channel quality of reception is higher than the described CBCH quality of reception threshold value that sets in advance in the sub-district of the broadcast multicast information that the described support of selecting is receiving self, form described area group.

5, the method for claim 1 is characterized in that, the condition that user terminal need satisfy based on re-selecting cell among the described step C selects corresponding sub-district as the gravity treatment Target cell in described area group.

6, the method for claim 1 is characterized in that, the broadcast multicast information that described user terminal receives comprises the broadcast multicast information of different brackets;

Specifically comprise step among the described step C:

User terminal is selected each sub-district that meets the condition that re-selecting cell need satisfy in described area group;

And the sub-district of the broadcast multicast information of the highest ranking of in each sub-district of selecting, selecting to support that user terminal receives, as the gravity treatment Target cell.

7, the method for claim 1 is characterized in that, the broadcast multicast information that described user terminal receives comprises the broadcast multicast information of different brackets;

Specifically comprise step among the described step C:

User terminal is selected each sub-district that meets the condition that re-selecting cell need satisfy in described area group;

At each sub-district of selecting, according to each sub-district the broadcast multicast information grade that can support, for the R criterion calculated value of respective cell adds corresponding grade weighted value;

Sorted according to the size that has added the R criterion calculated value after the grade weighted value is handled in described each sub-district;

And the sub-district of selecting R criterion calculated value maximum is as the gravity treatment Target cell.

8, the method for claim 1 is characterized in that, the broadcast multicast information that described user terminal receives comprises the broadcast multicast information of different brackets;

Also comprise step in the described steps A:

User terminal is further selected each sub-district of the broadcast multicast information of the highest ranking that can support that self receives in the sub-district of the broadcast multicast information that the described support of selecting is receiving self, form described area group.

9, the method for claim 1 is characterized in that, in the time of can not selecting the gravity treatment Target cell as if user terminal in step C, also comprises step:

The condition that user terminal need satisfy based on re-selecting cell selects corresponding sub-district as the gravity treatment Target cell in the sub-district that all have been measured; And

Gravity treatment is stationed in this gravity treatment Target cell.

10, the method for claim 1 is characterized in that, also comprises that gravity treatment Target cell relaying continued access that user terminal arrives in gravity treatment receives the step of broadcast multicast information after the described step D.

11, the method for claim 1 is characterized in that, described broadcast multicast information is:

Broadcast multicast service; And/or

Broadcast multicase control information.

12, a kind of cell reselection processing method is characterized in that, comprises step:

A, be in and receive broadcast multicast information state user terminal is down selected the broadcast multicast information that the support user terminal receiving in all sub-districts of having measured area group;

B, user terminal are selected each sub-district that meets the condition that re-selecting cell need satisfy in described area group; The broadcast multicast information that described user terminal receives comprises the broadcast multicast information of different brackets, at each sub-district of selecting, according to each sub-district the broadcast multicast information grade that can support, for the R criterion calculated value of respective cell adds corresponding grade weighted value; Sorted according to the size that has added the R criterion calculated value after the grade weighted value is handled in described each sub-district; And the sub-district of selecting R criterion calculated value maximum is as the gravity treatment Target cell;

C, user terminal gravity treatment are stationed in the gravity treatment Target cell of selecting.

13, a kind of user terminal is characterized in that, comprising:

First selected cell is used for user terminal and is in and receives broadcast multicast information state following time, selects the area group of the broadcast multicast information of supporting that user terminal is receiving in all sub-districts of having measured;

Know the unit, be used for knowing the broadcasting multicast service preferential frequencies layer information of UTRAN indication in current service cell;

The 3rd selected cell is used for knowing the broadcasting multicast service preferential frequencies layer information of knowing the unit according to described, will belong to cell selecting in this broadcasting multicast service preferential frequencies layer and go out to join in the area group that described first selected cell selects;

Second selected cell is used for selecting the gravity treatment Target cell at the area group that described the 3rd selected cell obtains;

The first gravity treatment unit is used for the gravity treatment Target cell that gravity treatment selects to described second selected cell and is stationed.

14, user terminal as claimed in claim 13 is characterized in that, also comprises:

Judging unit is used to judge whether described second selected cell can select the gravity treatment Target cell;

The 4th selected cell is used in the judged result of described judging unit selecting corresponding sub-district as the gravity treatment Target cell in the sub-district that all have been measured based on the condition that re-selecting cell need satisfy for not the time;

The second gravity treatment unit is used for the gravity treatment Target cell that gravity treatment selects to described the 4th selected cell and is stationed.

15, user terminal as claimed in claim 13 is characterized in that, also comprises information receiving unit, and broadcast multicast information is received in the gravity treatment Target cell relaying continued access that is used for choosing in the described first gravity treatment unit weighs.

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