CN1753558A - Method of controlling user terminal selection cell in radio communication system - Google Patents
Method of controlling user terminal selection cell in radio communication system Download PDFInfo
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Abstract
This invention discloses a method for controlling user terminals to select local areas in the wireless communication system, in which, the network side designs area selection parameters for terminal users of different kinds and sends them to the terminals including: a, a user terminal measures the signal quality of the area it places at the present and the adjacent area, b, the terminal determines the area it stations at based on the selection parameters of areas, which can reduce the load of areas of the optimized frequency layers and avoid congestions to further increase the service quality when carrying out the MBMS service and scatter the user terminals at the optimized frequency layer areas when ending the MBMS service.
Description
Technical field
The present invention relates to the cell selecting technology, refer to a kind of method of in wireless communication system, controlling user terminal selection cell especially.
Background technology
Development along with the 3G (Third Generation) Moblie technology, people no longer are satisfied with speech business to the demand of mobile communication, because 3G (Third Generation) Moblie can provide than the more service of high data rate of second generation mobile communication, so a large amount of multimedia services emerge, such as: services such as Internet network are downloaded, browsed at a high speed to visual telephone, picture.Wherein, some applied business require a plurality of users can receive identical data simultaneously, such as: video request program, television broadcasting, video conference, online education, interactive game or the like.
In order effectively to utilize the mobile radio communication resource, 3G (Third Generation) Moblie has been introduced the notion of multicast and broadcasting, and multicast and broadcasting are a kind of technology that transmits data from a data source to a plurality of targets.Be exactly specifically, the WCDMA/GSM global standardsization organize 3GPP to propose multimedia broadcast/group broadcast service (MBMS, Multimedia Broadcast/Multicast Service), so-called MBMS provides a data source to send the point-to-multipoint service of data to a plurality of users in mobile communications network, the realization Internet resources are shared, improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.The MBMS of 3GPP definition can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize the multicast and the broadcasting of high-speed multimedia business.
Fig. 1 is for supporting the wireless network architecture schematic diagram of broadcasting/packet service, as shown in Figure 1, among the existing 3GPP, support that the wireless network architecture of broadcasting/packet service is a broadcasting/packet service server (BM-SC) 101, BM-SC 101 is by Gmb interface or Gi interface and TPF critical point GPRS Support Node (GGSN, Gateway GPRS Support Node) 102 link to each other, and a BM-SC 101 can link to each other with a plurality of TPF GGSN102; TPF GGSN 102 links to each other by Gn/Gp interface and Serving GPRS Support Node (SGSN, ServingGPRS Support Node) 103, and a GGSN 102 can link to each other with a plurality of SGSN 103; SGSN103 can link to each other with universal mobile telecommunications system (UMTS) land radio access web (UTRAN) 104 by the Iu interface, UTRAN 104 links to each other with user terminal (UE) 106 by the Uu interface then, SGSN 103 also can strengthen wireless access network (GERAN) 105 by Iu/Gb interface and global system for mobile communications (GSM) and link to each other, and GERAN 105 links to each other with UE 107 by Um Interface then.Wherein, GGSN and SGSN belong to the node in the core net in the wireless network (CN).
The network configuration that provides from Fig. 1 as can be seen, in order to support the MBMS business, in 3-G (Generation Three mobile communication system), increased mobile network functional entity--broadcast multicast service center, be BM-SC, described BM-SC is content provider's a inlet, be used for authorizing and initiating the MBMS bearer service, and plan transmits the MBMS content to schedule at mobile network.In addition, on functional entitys such as UE, UTRAN, GERAN, SGSN, GGSN, increased the function relevant with MBMS.
MBMS comprises multicast pattern and broadcast mode, and wherein multicast pattern needs user's corresponding multicast group of contracting, and carries out activation of service, and produces corresponding charge information.Because it is different that multicast pattern and broadcast mode exist on business demand, cause also difference of operation flow separately, as shown in Figures 2 and 3, Fig. 2 is the operation flow schematic diagram of MSMS multicast pattern, Fig. 3 is the operation flow schematic diagram of MSMS broadcast mode.
As shown in Figure 2, the processing procedure that relates to of MBMS multicast service comprises: signatory (Subscription), service declaration (Service announcement), user add that (Joining), session begin (Session Start), MBMS notice (MBMS notification), data transmit (Data transfer), conversation end (SessionStop) and user and withdraw from (Leaving).Wherein, signatory process is used for allowing the user subscribe to required MBMS service in advance; Service declaration process is used for by the current service that can provide of BM-SC declaration; User's adition process is a MBMS activating multicast service process, UE is in adition process, informing network self is ready to become the member of current multicast group, receives corresponding professional multicast packet, and this adition process can be created the MBMS UE context of record UE information in the UE of network and adding multicast group; Session begins in the process, and BM-SC is ready to transfer of data, and informing network is set up the bearing resource of corresponding core net and Access Network; The MBMS notification procedure is used to notify UE MBMS multicast conversation to be about to begin; In data transfer procedure, BM-SC transfers data to UE by the bearing resource that session begins to set up in the process, the MBMS business has two kinds of patterns when transmitting between UTRAN and UE: point-to-multipoint (PTM) pattern and point-to-point (PTP) pattern, the PTM pattern sends identical data by the MTCH logic channel, all add multicast service or can receive the interested UE of broadcasting service, ptp mode sends data by the DTCH logic channel, has only a corresponding UE to receive; The conversation end process is used for the bearing resource that the session process that begins is set up is discharged; The user withdraws from process makes the subscriber in the group leave multicast group, i.e. user's receiving multicast data no longer, and this process can be with corresponding MBMS UE context deletion.
As shown in Figure 3, processing procedure that the MBMS broadcasting service relates to and MBMS multicast service are similar, just before session begins, do not need to carry out signatory process and user's adition process, and, after conversation end, do not need to carry out the user and withdraw from process.
In mobile communications network, the mobile meeting of user terminal causes the variation of Network Access Point and user terminal institute persistent district, in the WCDMA/GSM system, generally, finish the change of user terminal persistent district by sub-district gravity treatment and handover operation according to the difference of UE state.For guaranteeing that user terminal receives the MBMS business, prior art adopts frequency layer convergence (FLC, Frequency Layer Convergence) user terminal of machine-processed cause network layer control receiving multicast business carries out cell selecting, and so-called FLC is meant that the preferential gravity treatment of UTRAN request UE will send the process of the frequency layer of MBMS business to plan.The unlimited resources management (RRM) of RNC is the professional definite first-selected layer (PL of each MBMS, preferred layer), the PL of same MBMS business can get different values in the different piece of service area, on same PL, all MBMS business have identical MBMS deviant (offset).Receive that from RNC the session of Iu interface begins message and begins in receive till the conversation end message during this period of time, UTRAN may go up indication FLC information to multiple spot control channel (MCCH) at the MBMS point, and the FLC information of a MBMS business comprises: the frequency information and the MBMS deviant of this MBMS service identification, preferred layer.
The UE that receives certain MBMS business measures the signal quality of Serving cell and neighbor cell, and utilizes the MBMS deviant to assess the signal quality of each sub-district, selects top-quality sub-district.Here the said MBMS of utilization deviant is meant: the signal quality of measuring each sub-district all is normal measurement, but when evaluation of signal quality, compare again after will increasing a MBMS deviant to the signal quality of optimized frequency layer corresponding district, select top-quality sub-district, so, can make the UE of certain MBMS business of reception concentrate on same frequency layer as far as possible, and needn't all transmit the MBMS business in each frequency layer.Wherein, the MBMS deviant is the rational greater than zero, and the tendency that the relevant UE of the big more expression requirement of deviant chooses optimized frequency layer is big more.
But, there is following problem in the above-mentioned this method that makes the UE that receives the MBMS business concentrate on same frequency layer: when system provides a popular business in the optimized frequency layer sub-district, most of user in geographic area can move to optimized frequency layer by cell selecting, and the only remaining user seldom of other frequency layer, cause the decline of congested and quality of service of increase, the optimized frequency layer of optimized frequency layer cell load like this, on the one hand; On the other hand, the Radio Resource free time of not preferred frequency layer sub-district is not used.
Summary of the invention
In view of this, the method for control user terminal selection cell is provided to provide in a kind of wireless communication system main purpose of the present invention, carrying out MBMS when professional, alleviates the load of optimized frequency layer sub-district, avoids taking place congested, and then improves quality of service.
Further aim of the present invention is to be dispersed in the user terminal of optimized frequency layer sub-district after the MBMS service ending, reduces the load of optimized frequency layer sub-district.
For achieving the above object, technical scheme of the present invention is achieved in that
The method of control user terminal selection cell in a kind of wireless communication system, network side is that different classes of user terminal is provided with the cell selecting parameter according to the connection mode and the connection status of user terminal, and set cell selecting parameter is handed down to user terminal, this method further may further comprise the steps:
A. the signal quality of current sub-district of living in of user terminal measurement and neighbor cell;
B. user terminal is determined self currently to want resident sub-district according to set cell selecting parameter.
In the such scheme, describedly the cell selecting parameter is set is for different classes of user terminal: corresponding M BMS deviant is set according to the every class user terminal of not being all of user terminal connection mode and connection status; Then described step b specifically comprises:
B11. calculate the signal quality of active user's terminal optimized frequency layer sub-district according to set MBMS deviant, and the signal quality that the signal quality that calculates is finally obtained as this optimized frequency layer sub-district;
B12. user terminal selects the best sub-district of signal quality resident according to current all cell signal quality of obtaining.
Wherein, describedly corresponding M BMS deviant is set is specially for every class user terminal: for all user terminals that are in idle pulley are provided with a MBMS deviant, for all user terminals that are in connection mode are provided with the 2nd MBMS deviant.Perhaps, describedly corresponding M BMS deviant is set is specially for every class user terminal: for all user terminals that are in URA_PCH state under the user terminal of CELL_PCH state under the user terminal, connection mode of idle pulley and the connection mode are provided with a MBMS deviant, for all user terminals that are in CELL_FACH state under the connection mode are provided with the 2nd MBMS deviant.Perhaps, describedly corresponding M BMS deviant is set is specially for every class user terminal: for all user terminals that are in idle pulley are provided with a MBMS deviant; The user terminal of CELL_PCH state and URA_PCH state is provided with the 2nd MBMS deviant under the connection mode for all are in, for all user terminals that are in CELL_FACH state under the connection mode are provided with the 3rd MBMS deviant.
In the such scheme, describedly the cell selecting parameter is set is for different classes of user terminal: for all user terminals are provided with identical MBMS deviant, simultaneously each user terminal that is under the connection mode is provided with the gravity treatment probability factor, described gravity treatment probability factor is more than or equal to 0 and smaller or equal to 1, and then described step b specifically comprises:
B21. judge the whether needs gravity treatment of active user's terminal according to set gravity treatment probability factor, if desired, execution in step b22 then, otherwise, still reside in current area and finish current handling process;
B22. calculate the signal quality of active user's terminal optimized frequency layer sub-district according to set MBMS deviant, and the signal quality that the signal quality that calculates is finally obtained as this optimized frequency layer sub-district;
B23. user terminal selects the best sub-district of signal quality resident according to current all cell signal quality of obtaining.
In the such scheme, describedly the cell selecting parameter is set is for different classes of user terminal: for all user terminals are provided with identical MBMS deviant, simultaneously each user terminal that is in CELL_FACH state under the connection mode is provided with the gravity treatment probability factor, described gravity treatment probability factor is more than or equal to 0 and smaller or equal to 1, and then described step b specifically comprises:
B31. judge whether active user's terminal is in the CELL_FACH state, if, execution in step b32 then, otherwise, direct execution in step b33;
B32. judge the whether needs gravity treatment of active user's terminal according to set gravity treatment probability factor, if desired, execution in step b33 then, otherwise, still reside in current area and finish current handling process;
B33. calculate the signal quality of active user's terminal optimized frequency layer sub-district according to set MBMS deviant, and the signal quality that the signal quality that calculates is finally obtained as this optimized frequency layer sub-district;
B34. user terminal selects the best sub-district of signal quality resident according to current all cell signal quality of obtaining.
In the such scheme, network side is positioned over set cell selecting parameter and sends to relevant user terminals in the frequency layer coverage information respectively.
This method further comprises: when the MBMS conversation end, network side sends the indication whether the control user terminal carries out the sub-district gravity treatment to active user's terminal.Wherein, described active user's terminal is: all are in the user terminal under the idle pulley.Perhaps, described active user's terminal is: all are in user terminal under the idle pulley, all are in the user terminal of CELL_PCH state and URA_PCH state under the connection mode.
This method further comprises: whether the session of judging other MBMS business that active user's terminal is added is carried out, if then active user's terminal is not carried out the sub-district gravity treatment; Otherwise active user's terminal is carried out the sub-district gravity treatment.On this basis, this method can further include: whether the MBMS session of judging ongoing MBMS session of active user's terminal and end is in same optimized frequency layer, if then active user's terminal is not carried out the sub-district gravity treatment; Otherwise active user's terminal is carried out the sub-district gravity treatment.
The method of control user terminal selection cell in the wireless communication system provided by the present invention, by to being in the user terminal of different connection modes and connection status, separately MBMS deviant or gravity treatment probability factor are set, can make the current load condition in network based optimized frequency layer sub-district, the user terminal that control has certain feature switches to the optimized frequency layer sub-district, and all the other users still stay original sub-district, to guarantee that the optimized frequency layer sub-district does not take place congested, alleviate the load of optimized frequency layer sub-district, promote quality of service.In addition, when certain MBMS conversation end, send the indication of whether carrying out the sub-district gravity treatment to user terminal, so can control user terminal flexibly and carry out the sub-district gravity treatment, and can avoid the gravity treatment of frequent, unnecessary sub-district by network.
Description of drawings
Fig. 1 is for supporting the wireless network architecture schematic diagram of broadcasting/packet service;
Fig. 2 is the operation flow schematic diagram of MSMS multicast pattern;
Fig. 3 is the operation flow schematic diagram of MSMS broadcast mode;
Fig. 4 is the process chart of the inventive method one embodiment;
Fig. 5 is the process chart of another embodiment of the inventive method.
Embodiment
Core concept of the present invention is: network side is that different classes of user terminal is provided with the cell selecting parameter according to the connection mode and the state of user terminal, and set cell selecting parameter is handed down to user terminal, user terminal is when carrying out cell selecting, measure earlier the signal quality of current sub-district of living in and neighbor cell, determine self currently to want resident sub-district according to set cell selecting parameter again.
Here, described cell selecting parameter can only be the MBMS deviant, and in this case, the connection mode of user terminal or connection status difference, corresponding MBMS deviant just might be different; Described cell selecting parameter also can be MBMS deviant and gravity treatment probability factor, in this case, the user terminal that is under various connection modes and the connection status uses identical MBMS deviant, and each user terminal that is under the connection mode is provided with the gravity treatment probability factor.Wherein, described cell selecting parameter can be provided with by radio network controller (RNC), and is handed down to user terminal by FLC information.
Top connection mode of mentioning and connection status are to divide like this: at present, whether set up according to Radio Resource control (RRC) connection, user terminal is divided into free time (Idle) pattern is connected two kinds of (Connected) patterns with RRC, wherein do not set up the user terminal that RRC is connected and be in the Idle pattern with UTRAN equipment, user terminal under this pattern can only be distinguished by the sign of Non-Access Stratum (NAS), as distinguishing by IMSI; Set up the user terminal that RRC is connected with UTRAN equipment and be in the RRCConnected pattern, the user terminal under this pattern has distributed Radio Network Temporary Identifier (RNTI), as the sign of this user terminal on Common transport channel.
User terminal for RRC Connected pattern, the type of level that connects according to RRC and the user terminal transmission channel that can use is divided into different conditions with user terminal again, wherein the user terminal of CELL_PCH state, CELL_FACH state and CELL_DCH state can be distinguished on the level of sub-district, and the user terminal of URA_PCH state can be distinguished on UTRAN Registration Area (URA) level.The user terminal of CELL_DCH state has been assigned with special-purpose physical channel, can use dedicated transmission channel and shared channel and their combination; The user terminal of CELL_FACH state is at a descending continuous public transmission channel of monitoring (FACH), the common signal channel (RACH) that uplink assignment is default wanted; The mode that the user terminal of CELL_PCH and URA_PCH state adopts discontinuous reception (DRX) is by relevant PCH channel of PICH channel monitoring, under this two states without any up activity.
Based on the division of above-mentioned connection mode and connection status, the classification to user terminal among the present invention can have multiple mode: 1. user terminal is divided into user terminal and two classes of the user terminal under the connection mode under the idle pulley; 2. user terminal three classes that user terminal are divided into CELL_FACH state under the user terminal of CELL_PCH state and URA_PCH state under user terminal under the idle pulley, the connection mode and the connection mode; 3. with the user terminal of CELL_PCH state under the user terminal under the idle pulley, the connection mode and URA_PCH state as a class, with the user terminal of CELL_FACH state under the connection mode as another kind of, because CELL_PCH state and URA_PCH state do not have professional the generation, substantially can not exert an influence, can do identical processing with idle pulley to the congested of optimized frequency layer sub-district; To optimized frequency layer small area jam influence big mainly be exactly the user terminal of CELL_FACH state.
Embodiment one:
In the present embodiment, set cell selecting parameter only is the MBMS deviant, and so, the method for wireless communication system control user terminal selection cell may further comprise the steps as shown in Figure 4 in the present embodiment:
Step 401: the network equipment is that every class user terminal is provided with different MBMS deviants according to the connection mode of user terminal with connection status, and set MBMS deviant is sent to relevant user terminals by FLC information.In the present embodiment, as two class user terminals, the MBMS deviant that user terminal under the idle pulley is set is OFFSET with the user terminal under the idle pulley and the user terminal under the connection mode
a, the MBMS deviant that user terminal under the connection mode is set is OFFSET
b
In the present embodiment, the network equipment is RNC.The size of described MBMS deviant can be adjusted according to the load condition of optimized frequency layer sub-district, when the load of elected frequency layer sub-district is heavier, network side can be provided with the MBMS deviant of user terminal under the connection mode less, even be set to 0, so, in the time of just can making user terminal under the connection mode carry out cell selecting, the probability of choosing the optimized frequency layer sub-district reduces, and then alleviates the congestion condition of optimized frequency layer sub-district.
Here, the MBMS deviant of user terminal is set to OFFSET under also can idle pulley
a, the MBMS deviant of CELL_PCH state and URA_PCH state user terminal is set to OFFSET under the connection mode
b, the MBMS deviant of CELL_FACH state user terminal is set to OFFSET under the connection mode
cOr the MBMS deviant of the user terminal of CELL_PCH state and URA_PCH state is set to OFFSET under the idle pulley, under the connection mode
a, the MBMS deviant of CELL_FACH state user terminal is set to OFFSET under the connection mode
b
Step 402～404: when the user terminal that adds the MBMS business is received the FLC information that Access Network issues, user terminal under the idle pulley and the user terminal under the connection mode carry out the sub-district gravity treatment according to separately MBMS deviant respectively, determine self currently to want resident sub-district.Such as: the user terminal under the idle pulley is used OFFSET
aCarry out the sub-district gravity treatment, the user terminal under the connection mode is used OFFSET
bCarry out the sub-district gravity treatment.
Concrete cell reselection process is exactly: the signal quality of current sub-district of living in of user terminal measurement self and neighbor cell; Then, user terminal calculates the signal quality of optimized frequency layer sub-district according to the MBMS deviant of self, that is: the signal quality that obtains with the optimized frequency layer cell measurement adds the MBMS deviant of this user terminal, obtains the final signal quality of this optimized frequency layer sub-district; At last, user terminal is the signal quality of all related cell relatively again, comprises the signal quality that signal quality that the optimized frequency layer sub-district calculates and all not preferred frequency layer measure, and selects the best sub-district of signal quality resident.Certainly, in said process, the signal quality that also can allow all not preferred frequency layer cell measurements obtain deducts this MBMS deviant, user terminal compares and measures the signal quality of the optimized frequency layer sub-district that obtains and the signal quality of the not preferred frequency layer sub-district that calculates again then, selects the best sub-district of signal quality resident.
The method of present embodiment can make the network equipment can be according to optimized frequency layer sub-district present load situation, the user that control section has certain feature switches to the optimized frequency layer sub-district, all the other users still stay original sub-district, to guarantee that optimized frequency layer does not take place congested.Such as: the user terminal that will be in connection mode switches to the optimized frequency layer sub-district as far as possible, and the user terminal of idle pulley is stayed original sub-district.
Embodiment two:
In the present embodiment, set cell selecting parameter adds the gravity treatment probability factor for the MBMS deviant, wherein, same preferred layer is gone up all MBMS business and is had identical MBMS deviant, and each user terminal that is under the connection mode is provided with corresponding gravity treatment probability factor.So, the method for wireless communication system control user terminal selection cell may further comprise the steps as shown in Figure 5 in the present embodiment:
Step 501: the network equipment is provided with the gravity treatment probability factor for the user terminal that each is under the connection mode, and this gravity treatment probability factor also is positioned in the FLC information and is handed down to user terminal.Wherein, set gravity treatment probability factor is more than or equal to 0 and smaller or equal to 1 decimal, this gravity treatment probability factor is an equally distributed random number, and the gravity treatment probability factor of each user terminal correspondence can be identical, also can be different.
Step 502～504: when adding the FLC information that MBMS user terminal business, that be in connection mode receives that Access Network issues, earlier according to the gravity treatment probability factor in the FLC information, judge whether to carry out the sub-district gravity treatment, if do not need, then active user's terminal continues to reside in the original sub-district, and finishes current handling process; If desired, then the MBMS deviant of the MBMS business that added of active user's terminal applies is carried out the sub-district gravity treatment, cell reselection process is basic identical described in concrete cell reselection process and embodiment one step 402～404, and just the MBMS deviant that different classes of user terminal is used in the present embodiment is identical.
Equally, the size of the probability factor of gravity treatment described in the present embodiment can be adjusted according to the load condition of optimized frequency layer sub-district, when the load of elected frequency layer sub-district is heavier, network side can be provided with the gravity treatment probability factor less, even be set to 0, so, just making user terminal under the connection mode use the MBMS deviant carries out the probability of sub-district gravity treatment and reduces, so, the number of choosing the user terminal of optimized frequency layer sub-district will reduce, thereby alleviates the congestion condition of optimized frequency layer sub-district.
Because URA_PCH state under idle pulley, the connection mode and CELL_PCH state do not have professional the generation substantially, optimized frequency layer sub-district congested do not constituted influence substantially, so, also can be only the user terminal of CELL_FACH state under all connection modes be provided with the gravity treatment probability factor.In this case, need to increase a judgement before the step 502: judge whether active user's terminal is in the CELL_FACH state, if not, then direct execution in step 503 is used the MBMS deviant and is carried out the sub-district gravity treatment; If then execution in step 502.Certainly, if the connection status of active user's terminal is not CELL_FACH, this user terminal also can not carry out the sub-district gravity treatment, and resides at original sub-district.
Receive professional user terminal in the optimized frequency layer sub-district for adding the MBMS business, be distributed on each frequency layer when the MBMS conversation end, should make the user terminal that is in the optimized frequency layer sub-district carry out the sub-district gravity treatment in order to make user terminal.
Can make user terminal behind conversation end, carry out the sub-district gravity treatment in different ways, first kind of mode is: since time started of MBMS session be expected, so, network side can directly send the indication whether control active user terminal carries out gravity treatment when conversation end, user terminal determines whether to carry out the sub-district gravity treatment according to the indication of being received, if the network side indication needs to disperse, then user terminal carries out the sub-district gravity treatment according to the cell selecting flow process of prior art, so user terminal can be distributed to each frequency layer sub-district; Do not need to disperse if network side is indicated, then user terminal does not carry out the sub-district gravity treatment, so can avoid frequent, unnecessary switching.
In this case, can only send indication, also can only be in user terminal idle pulley, that be in connection mode URA_PCH state and CELL_PCH state and send indication all to all user terminals that are in idle pulley.For the user terminal that is in different connection modes or connection status, can issue a plurality of indications simultaneously, indicate the user terminal of different connection modes or connection status whether to carry out the sub-district gravity treatment respectively, these indications can be placed in a piece of news and issue, and also can be placed in the multiple messages to issue respectively.Wherein, gravity treatment indication in described sub-district can be the variable of a boolean (Boolean) type, and value is that True represents to carry out the sub-district gravity treatment, and value is that False represents not carry out the sub-district gravity treatment.
The second way is, on the scheme basis of first kind of dispersion user terminal, when judging certain conversation end, whether other multicast services that this session corresponding user terminal is added have session to carry out, if have, then this user terminal does not carry out the sub-district gravity treatment, even this user terminal receives that the dispersion indication of network side do not carry out gravity treatment yet; Otherwise this user terminal carries out the sub-district gravity treatment.On this basis, can also increase a judgement again, whether the MBMS session of judging ongoing MBMS session of active user's terminal and current end belongs to same optimized frequency layer, if, then this user terminal does not carry out the sub-district gravity treatment, even this user terminal receives that the dispersion indication of network side do not carry out gravity treatment yet, because there is no need to carry out the sub-district gravity treatment; If not, then this user terminal carries out the sub-district gravity treatment.Here, describedly carry out the sub-district gravity treatment and can make and carry out at once, continue the MBMS session, finish a sub-district switching on one side on one side be equivalent to active user's terminal; Also can behind ongoing MBMS conversation end, carry out the sub-district gravity treatment again.Can use the MBMS deviant of new optimized frequency layer when wherein, carrying out the sub-district gravity treatment.
Such scheme is applicable to wireless communication systems such as GPRS, EDGE, WCDMA, TD-SCDMA, and the above only is preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (13)
1, the method for control user terminal selection cell in a kind of wireless communication system, it is characterized in that, network side is that different classes of user terminal is provided with the cell selecting parameter according to the connection mode and the connection status of user terminal, and set cell selecting parameter is handed down to user terminal, this method further may further comprise the steps:
A. the signal quality of current sub-district of living in of user terminal measurement and neighbor cell;
B. user terminal is determined self currently to want resident sub-district according to set cell selecting parameter.
2, method according to claim 1 is characterized in that, describedly the cell selecting parameter is set is for different classes of user terminal: according to the every class user terminal of not being all of user terminal connection mode and connection status corresponding M BMS deviant is set; Then described step b specifically comprises:
B11. calculate the signal quality of active user's terminal optimized frequency layer sub-district according to set MBMS deviant, and the signal quality that the signal quality that calculates is finally obtained as this optimized frequency layer sub-district;
B12. user terminal selects the best sub-district of signal quality resident according to current all cell signal quality of obtaining.
3, method according to claim 2, it is characterized in that, describedly corresponding M BMS deviant is set is specially for every class user terminal: for all user terminals that are in idle pulley are provided with a MBMS deviant, for all user terminals that are in connection mode are provided with the 2nd MBMS deviant.
4, method according to claim 2, it is characterized in that, describedly corresponding M BMS deviant is set is specially for every class user terminal: for all user terminals that are in URA_PCH state under the user terminal of CELL_PCH state under the user terminal, connection mode of idle pulley and the connection mode are provided with a MBMS deviant, for all user terminals that are in CELL_FACH state under the connection mode are provided with the 2nd MBMS deviant.
5, method according to claim 2 is characterized in that, describedly corresponding M BMS deviant is set is specially for every class user terminal: for all user terminals that are in idle pulley are provided with a MBMS deviant; The user terminal of CELL_PCH state and URA_PCH state is provided with the 2nd MBMS deviant under the connection mode for all are in, for all user terminals that are in CELL_FACH state under the connection mode are provided with the 3rd MBMS deviant.
6, method according to claim 1, it is characterized in that, describedly the cell selecting parameter is set is for different classes of user terminal: for all user terminals are provided with identical MBMS deviant, simultaneously each user terminal that is under the connection mode is provided with the gravity treatment probability factor, described gravity treatment probability factor is more than or equal to 0 and smaller or equal to 1, and then described step b specifically comprises:
B21. judge the whether needs gravity treatment of active user's terminal according to set gravity treatment probability factor, if desired, execution in step b22 then, otherwise, still reside in current area and finish current handling process;
B22. calculate the signal quality of active user's terminal optimized frequency layer sub-district according to set MBMS deviant, and the signal quality that the signal quality that calculates is finally obtained as this optimized frequency layer sub-district;
B23. user terminal selects the best sub-district of signal quality resident according to current all cell signal quality of obtaining.
7, method according to claim 1, it is characterized in that, describedly the cell selecting parameter is set is for different classes of user terminal: for all user terminals are provided with identical MBMS deviant, simultaneously each user terminal that is in CELL_FACH state under the connection mode is provided with the gravity treatment probability factor, described gravity treatment probability factor is more than or equal to 0 and smaller or equal to 1, and then described step b specifically comprises:
B31. judge whether active user's terminal is in the CELL_FACH state, if, execution in step b32 then, otherwise, direct execution in step b33;
B32. judge the whether needs gravity treatment of active user's terminal according to set gravity treatment probability factor, if desired, execution in step b33 then, otherwise, still reside in current area and finish current handling process;
B33. calculate the signal quality of active user's terminal optimized frequency layer sub-district according to set MBMS deviant, and the signal quality that the signal quality that calculates is finally obtained as this optimized frequency layer sub-district;
B34. user terminal selects the best sub-district of signal quality resident according to current all cell signal quality of obtaining.
8, method according to claim 1 is characterized in that, network side is positioned over set cell selecting parameter and sends to relevant user terminals in the frequency layer coverage information respectively.
9, according to each described method of claim 1 to 8, it is characterized in that this method further comprises: when the MBMS conversation end, network side sends the indication whether the control user terminal carries out the sub-district gravity treatment to active user's terminal.
10, method according to claim 9 is characterized in that, described active user's terminal is: all are in the user terminal under the idle pulley.
11, method according to claim 9 is characterized in that, described active user's terminal is: all are in user terminal under the idle pulley, all are in the user terminal of CELL_PCH state and URA_PCH state under the connection mode.
12, method according to claim 9 is characterized in that, this method further comprises: whether the session of judging other MBMS business that active user's terminal is added is carried out, if then active user's terminal is not carried out the sub-district gravity treatment; Otherwise active user's terminal is carried out the sub-district gravity treatment.
13, the method for stating according to claim 12, it is characterized in that, this method further comprises: whether the MBMS session of judging ongoing MBMS session of active user's terminal and end is in same optimized frequency layer, if then active user's terminal is not carried out the sub-district gravity treatment; Otherwise active user's terminal is carried out the sub-district gravity treatment.
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| CNB2004100801985A CN100415038C (en) | 2004-09-24 | 2004-09-24 | Method of controlling user terminal selection cell in radio communication system |
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| CNB2004100801985A CN100415038C (en) | 2004-09-24 | 2004-09-24 | Method of controlling user terminal selection cell in radio communication system |
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| CN100415038C CN100415038C (en) | 2008-08-27 |
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